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/freezer.h>
37 #include <linux/blkdev.h>
38 #include <linux/sysctl.h>
39 #include <linux/seq_file.h>
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/module.h>
48 #include <linux/reboot.h>
49 #include <linux/file.h>
50 #include <linux/compat.h>
51 #include <linux/delay.h>
52 #include <linux/raid/md_p.h>
53 #include <linux/raid/md_u.h>
54 #include <linux/slab.h>
59 static void autostart_arrays(int part
);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list
);
68 static DEFINE_SPINLOCK(pers_lock
);
70 static void md_print_devices(void);
72 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
73 static struct workqueue_struct
*md_wq
;
74 static struct workqueue_struct
*md_misc_wq
;
76 static int remove_and_add_spares(struct mddev
*mddev
,
77 struct md_rdev
*this);
79 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
82 * Default number of read corrections we'll attempt on an rdev
83 * before ejecting it from the array. We divide the read error
84 * count by 2 for every hour elapsed between read errors.
86 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
88 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
89 * is 1000 KB/sec, so the extra system load does not show up that much.
90 * Increase it if you want to have more _guaranteed_ speed. Note that
91 * the RAID driver will use the maximum available bandwidth if the IO
92 * subsystem is idle. There is also an 'absolute maximum' reconstruction
93 * speed limit - in case reconstruction slows down your system despite
96 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
97 * or /sys/block/mdX/md/sync_speed_{min,max}
100 static int sysctl_speed_limit_min
= 1000;
101 static int sysctl_speed_limit_max
= 200000;
102 static inline int speed_min(struct mddev
*mddev
)
104 return mddev
->sync_speed_min
?
105 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
108 static inline int speed_max(struct mddev
*mddev
)
110 return mddev
->sync_speed_max
?
111 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
114 static struct ctl_table_header
*raid_table_header
;
116 static ctl_table raid_table
[] = {
118 .procname
= "speed_limit_min",
119 .data
= &sysctl_speed_limit_min
,
120 .maxlen
= sizeof(int),
121 .mode
= S_IRUGO
|S_IWUSR
,
122 .proc_handler
= proc_dointvec
,
125 .procname
= "speed_limit_max",
126 .data
= &sysctl_speed_limit_max
,
127 .maxlen
= sizeof(int),
128 .mode
= S_IRUGO
|S_IWUSR
,
129 .proc_handler
= proc_dointvec
,
134 static ctl_table raid_dir_table
[] = {
138 .mode
= S_IRUGO
|S_IXUGO
,
144 static ctl_table raid_root_table
[] = {
149 .child
= raid_dir_table
,
154 static const struct block_device_operations md_fops
;
156 static int start_readonly
;
159 * like bio_clone, but with a local bio set
162 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
167 if (!mddev
|| !mddev
->bio_set
)
168 return bio_alloc(gfp_mask
, nr_iovecs
);
170 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
175 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
177 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
180 if (!mddev
|| !mddev
->bio_set
)
181 return bio_clone(bio
, gfp_mask
);
183 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
185 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
187 void md_trim_bio(struct bio
*bio
, int offset
, int size
)
189 /* 'bio' is a cloned bio which we need to trim to match
190 * the given offset and size.
191 * This requires adjusting bi_sector, bi_size, and bi_io_vec
194 struct bio_vec
*bvec
;
198 if (offset
== 0 && size
== bio
->bi_size
)
201 clear_bit(BIO_SEG_VALID
, &bio
->bi_flags
);
203 bio_advance(bio
, offset
<< 9);
207 /* avoid any complications with bi_idx being non-zero*/
209 memmove(bio
->bi_io_vec
, bio
->bi_io_vec
+bio
->bi_idx
,
210 (bio
->bi_vcnt
- bio
->bi_idx
) * sizeof(struct bio_vec
));
211 bio
->bi_vcnt
-= bio
->bi_idx
;
214 /* Make sure vcnt and last bv are not too big */
215 bio_for_each_segment(bvec
, bio
, i
) {
216 if (sofar
+ bvec
->bv_len
> size
)
217 bvec
->bv_len
= size
- sofar
;
218 if (bvec
->bv_len
== 0) {
222 sofar
+= bvec
->bv_len
;
225 EXPORT_SYMBOL_GPL(md_trim_bio
);
228 * We have a system wide 'event count' that is incremented
229 * on any 'interesting' event, and readers of /proc/mdstat
230 * can use 'poll' or 'select' to find out when the event
234 * start array, stop array, error, add device, remove device,
235 * start build, activate spare
237 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
238 static atomic_t md_event_count
;
239 void md_new_event(struct mddev
*mddev
)
241 atomic_inc(&md_event_count
);
242 wake_up(&md_event_waiters
);
244 EXPORT_SYMBOL_GPL(md_new_event
);
246 /* Alternate version that can be called from interrupts
247 * when calling sysfs_notify isn't needed.
249 static void md_new_event_inintr(struct mddev
*mddev
)
251 atomic_inc(&md_event_count
);
252 wake_up(&md_event_waiters
);
256 * Enables to iterate over all existing md arrays
257 * all_mddevs_lock protects this list.
259 static LIST_HEAD(all_mddevs
);
260 static DEFINE_SPINLOCK(all_mddevs_lock
);
264 * iterates through all used mddevs in the system.
265 * We take care to grab the all_mddevs_lock whenever navigating
266 * the list, and to always hold a refcount when unlocked.
267 * Any code which breaks out of this loop while own
268 * a reference to the current mddev and must mddev_put it.
270 #define for_each_mddev(_mddev,_tmp) \
272 for (({ spin_lock(&all_mddevs_lock); \
273 _tmp = all_mddevs.next; \
275 ({ if (_tmp != &all_mddevs) \
276 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
277 spin_unlock(&all_mddevs_lock); \
278 if (_mddev) mddev_put(_mddev); \
279 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
280 _tmp != &all_mddevs;}); \
281 ({ spin_lock(&all_mddevs_lock); \
282 _tmp = _tmp->next;}) \
286 /* Rather than calling directly into the personality make_request function,
287 * IO requests come here first so that we can check if the device is
288 * being suspended pending a reconfiguration.
289 * We hold a refcount over the call to ->make_request. By the time that
290 * call has finished, the bio has been linked into some internal structure
291 * and so is visible to ->quiesce(), so we don't need the refcount any more.
293 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
295 const int rw
= bio_data_dir(bio
);
296 struct mddev
*mddev
= q
->queuedata
;
298 unsigned int sectors
;
300 if (mddev
== NULL
|| mddev
->pers
== NULL
305 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
306 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
309 smp_rmb(); /* Ensure implications of 'active' are visible */
311 if (mddev
->suspended
) {
314 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
315 TASK_UNINTERRUPTIBLE
);
316 if (!mddev
->suspended
)
322 finish_wait(&mddev
->sb_wait
, &__wait
);
324 atomic_inc(&mddev
->active_io
);
328 * save the sectors now since our bio can
329 * go away inside make_request
331 sectors
= bio_sectors(bio
);
332 mddev
->pers
->make_request(mddev
, bio
);
334 cpu
= part_stat_lock();
335 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
336 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
339 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
340 wake_up(&mddev
->sb_wait
);
343 /* mddev_suspend makes sure no new requests are submitted
344 * to the device, and that any requests that have been submitted
345 * are completely handled.
346 * Once ->stop is called and completes, the module will be completely
349 void mddev_suspend(struct mddev
*mddev
)
351 BUG_ON(mddev
->suspended
);
352 mddev
->suspended
= 1;
354 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
355 mddev
->pers
->quiesce(mddev
, 1);
357 del_timer_sync(&mddev
->safemode_timer
);
359 EXPORT_SYMBOL_GPL(mddev_suspend
);
361 void mddev_resume(struct mddev
*mddev
)
363 mddev
->suspended
= 0;
364 wake_up(&mddev
->sb_wait
);
365 mddev
->pers
->quiesce(mddev
, 0);
367 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
368 md_wakeup_thread(mddev
->thread
);
369 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
371 EXPORT_SYMBOL_GPL(mddev_resume
);
373 int mddev_congested(struct mddev
*mddev
, int bits
)
375 return mddev
->suspended
;
377 EXPORT_SYMBOL(mddev_congested
);
380 * Generic flush handling for md
383 static void md_end_flush(struct bio
*bio
, int err
)
385 struct md_rdev
*rdev
= bio
->bi_private
;
386 struct mddev
*mddev
= rdev
->mddev
;
388 rdev_dec_pending(rdev
, mddev
);
390 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
391 /* The pre-request flush has finished */
392 queue_work(md_wq
, &mddev
->flush_work
);
397 static void md_submit_flush_data(struct work_struct
*ws
);
399 static void submit_flushes(struct work_struct
*ws
)
401 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
402 struct md_rdev
*rdev
;
404 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
405 atomic_set(&mddev
->flush_pending
, 1);
407 rdev_for_each_rcu(rdev
, mddev
)
408 if (rdev
->raid_disk
>= 0 &&
409 !test_bit(Faulty
, &rdev
->flags
)) {
410 /* Take two references, one is dropped
411 * when request finishes, one after
412 * we reclaim rcu_read_lock
415 atomic_inc(&rdev
->nr_pending
);
416 atomic_inc(&rdev
->nr_pending
);
418 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
419 bi
->bi_end_io
= md_end_flush
;
420 bi
->bi_private
= rdev
;
421 bi
->bi_bdev
= rdev
->bdev
;
422 atomic_inc(&mddev
->flush_pending
);
423 submit_bio(WRITE_FLUSH
, bi
);
425 rdev_dec_pending(rdev
, mddev
);
428 if (atomic_dec_and_test(&mddev
->flush_pending
))
429 queue_work(md_wq
, &mddev
->flush_work
);
432 static void md_submit_flush_data(struct work_struct
*ws
)
434 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
435 struct bio
*bio
= mddev
->flush_bio
;
437 if (bio
->bi_size
== 0)
438 /* an empty barrier - all done */
441 bio
->bi_rw
&= ~REQ_FLUSH
;
442 mddev
->pers
->make_request(mddev
, bio
);
445 mddev
->flush_bio
= NULL
;
446 wake_up(&mddev
->sb_wait
);
449 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
451 spin_lock_irq(&mddev
->write_lock
);
452 wait_event_lock_irq(mddev
->sb_wait
,
455 mddev
->flush_bio
= bio
;
456 spin_unlock_irq(&mddev
->write_lock
);
458 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
459 queue_work(md_wq
, &mddev
->flush_work
);
461 EXPORT_SYMBOL(md_flush_request
);
463 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
465 struct mddev
*mddev
= cb
->data
;
466 md_wakeup_thread(mddev
->thread
);
469 EXPORT_SYMBOL(md_unplug
);
471 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
473 atomic_inc(&mddev
->active
);
477 static void mddev_delayed_delete(struct work_struct
*ws
);
479 static void mddev_put(struct mddev
*mddev
)
481 struct bio_set
*bs
= NULL
;
483 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
485 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
486 mddev
->ctime
== 0 && !mddev
->hold_active
) {
487 /* Array is not configured at all, and not held active,
489 list_del_init(&mddev
->all_mddevs
);
491 mddev
->bio_set
= NULL
;
492 if (mddev
->gendisk
) {
493 /* We did a probe so need to clean up. Call
494 * queue_work inside the spinlock so that
495 * flush_workqueue() after mddev_find will
496 * succeed in waiting for the work to be done.
498 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
499 queue_work(md_misc_wq
, &mddev
->del_work
);
503 spin_unlock(&all_mddevs_lock
);
508 void mddev_init(struct mddev
*mddev
)
510 mutex_init(&mddev
->open_mutex
);
511 mutex_init(&mddev
->reconfig_mutex
);
512 mutex_init(&mddev
->bitmap_info
.mutex
);
513 INIT_LIST_HEAD(&mddev
->disks
);
514 INIT_LIST_HEAD(&mddev
->all_mddevs
);
515 init_timer(&mddev
->safemode_timer
);
516 atomic_set(&mddev
->active
, 1);
517 atomic_set(&mddev
->openers
, 0);
518 atomic_set(&mddev
->active_io
, 0);
519 spin_lock_init(&mddev
->write_lock
);
520 atomic_set(&mddev
->flush_pending
, 0);
521 init_waitqueue_head(&mddev
->sb_wait
);
522 init_waitqueue_head(&mddev
->recovery_wait
);
523 mddev
->reshape_position
= MaxSector
;
524 mddev
->reshape_backwards
= 0;
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 mddev_lock(struct mddev
* mddev
)
607 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
610 static inline int mddev_is_locked(struct mddev
*mddev
)
612 return mutex_is_locked(&mddev
->reconfig_mutex
);
615 static inline int mddev_trylock(struct mddev
* mddev
)
617 return mutex_trylock(&mddev
->reconfig_mutex
);
620 static struct attribute_group md_redundancy_group
;
622 static void mddev_unlock(struct mddev
* mddev
)
624 if (mddev
->to_remove
) {
625 /* These cannot be removed under reconfig_mutex as
626 * an access to the files will try to take reconfig_mutex
627 * while holding the file unremovable, which leads to
629 * So hold set sysfs_active while the remove in happeing,
630 * and anything else which might set ->to_remove or my
631 * otherwise change the sysfs namespace will fail with
632 * -EBUSY if sysfs_active is still set.
633 * We set sysfs_active under reconfig_mutex and elsewhere
634 * test it under the same mutex to ensure its correct value
637 struct attribute_group
*to_remove
= mddev
->to_remove
;
638 mddev
->to_remove
= NULL
;
639 mddev
->sysfs_active
= 1;
640 mutex_unlock(&mddev
->reconfig_mutex
);
642 if (mddev
->kobj
.sd
) {
643 if (to_remove
!= &md_redundancy_group
)
644 sysfs_remove_group(&mddev
->kobj
, to_remove
);
645 if (mddev
->pers
== NULL
||
646 mddev
->pers
->sync_request
== NULL
) {
647 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
648 if (mddev
->sysfs_action
)
649 sysfs_put(mddev
->sysfs_action
);
650 mddev
->sysfs_action
= NULL
;
653 mddev
->sysfs_active
= 0;
655 mutex_unlock(&mddev
->reconfig_mutex
);
657 /* As we've dropped the mutex we need a spinlock to
658 * make sure the thread doesn't disappear
660 spin_lock(&pers_lock
);
661 md_wakeup_thread(mddev
->thread
);
662 spin_unlock(&pers_lock
);
665 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
667 struct md_rdev
*rdev
;
669 rdev_for_each(rdev
, mddev
)
670 if (rdev
->desc_nr
== nr
)
676 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
678 struct md_rdev
*rdev
;
680 rdev_for_each_rcu(rdev
, mddev
)
681 if (rdev
->desc_nr
== nr
)
687 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
689 struct md_rdev
*rdev
;
691 rdev_for_each(rdev
, mddev
)
692 if (rdev
->bdev
->bd_dev
== dev
)
698 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
700 struct md_rdev
*rdev
;
702 rdev_for_each_rcu(rdev
, mddev
)
703 if (rdev
->bdev
->bd_dev
== dev
)
709 static struct md_personality
*find_pers(int level
, char *clevel
)
711 struct md_personality
*pers
;
712 list_for_each_entry(pers
, &pers_list
, list
) {
713 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
715 if (strcmp(pers
->name
, clevel
)==0)
721 /* return the offset of the super block in 512byte sectors */
722 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
724 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
725 return MD_NEW_SIZE_SECTORS(num_sectors
);
728 static int alloc_disk_sb(struct md_rdev
* rdev
)
733 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
734 if (!rdev
->sb_page
) {
735 printk(KERN_ALERT
"md: out of memory.\n");
742 void md_rdev_clear(struct md_rdev
*rdev
)
745 put_page(rdev
->sb_page
);
747 rdev
->sb_page
= NULL
;
752 put_page(rdev
->bb_page
);
753 rdev
->bb_page
= NULL
;
755 kfree(rdev
->badblocks
.page
);
756 rdev
->badblocks
.page
= NULL
;
758 EXPORT_SYMBOL_GPL(md_rdev_clear
);
760 static void super_written(struct bio
*bio
, int error
)
762 struct md_rdev
*rdev
= bio
->bi_private
;
763 struct mddev
*mddev
= rdev
->mddev
;
765 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
766 printk("md: super_written gets error=%d, uptodate=%d\n",
767 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
768 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
769 md_error(mddev
, rdev
);
772 if (atomic_dec_and_test(&mddev
->pending_writes
))
773 wake_up(&mddev
->sb_wait
);
777 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
778 sector_t sector
, int size
, struct page
*page
)
780 /* write first size bytes of page to sector of rdev
781 * Increment mddev->pending_writes before returning
782 * and decrement it on completion, waking up sb_wait
783 * if zero is reached.
784 * If an error occurred, call md_error
786 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
788 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
789 bio
->bi_sector
= sector
;
790 bio_add_page(bio
, page
, size
, 0);
791 bio
->bi_private
= rdev
;
792 bio
->bi_end_io
= super_written
;
794 atomic_inc(&mddev
->pending_writes
);
795 submit_bio(WRITE_FLUSH_FUA
, bio
);
798 void md_super_wait(struct mddev
*mddev
)
800 /* wait for all superblock writes that were scheduled to complete */
803 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
804 if (atomic_read(&mddev
->pending_writes
)==0)
808 finish_wait(&mddev
->sb_wait
, &wq
);
811 static void bi_complete(struct bio
*bio
, int error
)
813 complete((struct completion
*)bio
->bi_private
);
816 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
817 struct page
*page
, int rw
, bool metadata_op
)
819 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
820 struct completion event
;
825 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
826 rdev
->meta_bdev
: rdev
->bdev
;
828 bio
->bi_sector
= sector
+ rdev
->sb_start
;
829 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
830 (rdev
->mddev
->reshape_backwards
==
831 (sector
>= rdev
->mddev
->reshape_position
)))
832 bio
->bi_sector
= sector
+ rdev
->new_data_offset
;
834 bio
->bi_sector
= sector
+ rdev
->data_offset
;
835 bio_add_page(bio
, page
, size
, 0);
836 init_completion(&event
);
837 bio
->bi_private
= &event
;
838 bio
->bi_end_io
= bi_complete
;
840 wait_for_completion(&event
);
842 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
846 EXPORT_SYMBOL_GPL(sync_page_io
);
848 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
850 char b
[BDEVNAME_SIZE
];
851 if (!rdev
->sb_page
) {
859 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
865 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
866 bdevname(rdev
->bdev
,b
));
870 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
872 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
873 sb1
->set_uuid1
== sb2
->set_uuid1
&&
874 sb1
->set_uuid2
== sb2
->set_uuid2
&&
875 sb1
->set_uuid3
== sb2
->set_uuid3
;
878 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
881 mdp_super_t
*tmp1
, *tmp2
;
883 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
884 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
886 if (!tmp1
|| !tmp2
) {
888 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
896 * nr_disks is not constant
901 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
909 static u32
md_csum_fold(u32 csum
)
911 csum
= (csum
& 0xffff) + (csum
>> 16);
912 return (csum
& 0xffff) + (csum
>> 16);
915 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
918 u32
*sb32
= (u32
*)sb
;
920 unsigned int disk_csum
, csum
;
922 disk_csum
= sb
->sb_csum
;
925 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
927 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
931 /* This used to use csum_partial, which was wrong for several
932 * reasons including that different results are returned on
933 * different architectures. It isn't critical that we get exactly
934 * the same return value as before (we always csum_fold before
935 * testing, and that removes any differences). However as we
936 * know that csum_partial always returned a 16bit value on
937 * alphas, do a fold to maximise conformity to previous behaviour.
939 sb
->sb_csum
= md_csum_fold(disk_csum
);
941 sb
->sb_csum
= disk_csum
;
948 * Handle superblock details.
949 * We want to be able to handle multiple superblock formats
950 * so we have a common interface to them all, and an array of
951 * different handlers.
952 * We rely on user-space to write the initial superblock, and support
953 * reading and updating of superblocks.
954 * Interface methods are:
955 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
956 * loads and validates a superblock on dev.
957 * if refdev != NULL, compare superblocks on both devices
959 * 0 - dev has a superblock that is compatible with refdev
960 * 1 - dev has a superblock that is compatible and newer than refdev
961 * so dev should be used as the refdev in future
962 * -EINVAL superblock incompatible or invalid
963 * -othererror e.g. -EIO
965 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
966 * Verify that dev is acceptable into mddev.
967 * The first time, mddev->raid_disks will be 0, and data from
968 * dev should be merged in. Subsequent calls check that dev
969 * is new enough. Return 0 or -EINVAL
971 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
972 * Update the superblock for rdev with data in mddev
973 * This does not write to disc.
979 struct module
*owner
;
980 int (*load_super
)(struct md_rdev
*rdev
,
981 struct md_rdev
*refdev
,
983 int (*validate_super
)(struct mddev
*mddev
,
984 struct md_rdev
*rdev
);
985 void (*sync_super
)(struct mddev
*mddev
,
986 struct md_rdev
*rdev
);
987 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
988 sector_t num_sectors
);
989 int (*allow_new_offset
)(struct md_rdev
*rdev
,
990 unsigned long long new_offset
);
994 * Check that the given mddev has no bitmap.
996 * This function is called from the run method of all personalities that do not
997 * support bitmaps. It prints an error message and returns non-zero if mddev
998 * has a bitmap. Otherwise, it returns 0.
1001 int md_check_no_bitmap(struct mddev
*mddev
)
1003 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1005 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1006 mdname(mddev
), mddev
->pers
->name
);
1009 EXPORT_SYMBOL(md_check_no_bitmap
);
1012 * load_super for 0.90.0
1014 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1016 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1021 * Calculate the position of the superblock (512byte sectors),
1022 * it's at the end of the disk.
1024 * It also happens to be a multiple of 4Kb.
1026 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1028 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1029 if (ret
) return ret
;
1033 bdevname(rdev
->bdev
, b
);
1034 sb
= page_address(rdev
->sb_page
);
1036 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1037 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1042 if (sb
->major_version
!= 0 ||
1043 sb
->minor_version
< 90 ||
1044 sb
->minor_version
> 91) {
1045 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1046 sb
->major_version
, sb
->minor_version
,
1051 if (sb
->raid_disks
<= 0)
1054 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1055 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1060 rdev
->preferred_minor
= sb
->md_minor
;
1061 rdev
->data_offset
= 0;
1062 rdev
->new_data_offset
= 0;
1063 rdev
->sb_size
= MD_SB_BYTES
;
1064 rdev
->badblocks
.shift
= -1;
1066 if (sb
->level
== LEVEL_MULTIPATH
)
1069 rdev
->desc_nr
= sb
->this_disk
.number
;
1075 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1076 if (!uuid_equal(refsb
, sb
)) {
1077 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1078 b
, bdevname(refdev
->bdev
,b2
));
1081 if (!sb_equal(refsb
, sb
)) {
1082 printk(KERN_WARNING
"md: %s has same UUID"
1083 " but different superblock to %s\n",
1084 b
, bdevname(refdev
->bdev
, b2
));
1088 ev2
= md_event(refsb
);
1094 rdev
->sectors
= rdev
->sb_start
;
1095 /* Limit to 4TB as metadata cannot record more than that.
1096 * (not needed for Linear and RAID0 as metadata doesn't
1099 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1100 rdev
->sectors
= (2ULL << 32) - 2;
1102 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1103 /* "this cannot possibly happen" ... */
1111 * validate_super for 0.90.0
1113 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1116 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1117 __u64 ev1
= md_event(sb
);
1119 rdev
->raid_disk
= -1;
1120 clear_bit(Faulty
, &rdev
->flags
);
1121 clear_bit(In_sync
, &rdev
->flags
);
1122 clear_bit(Bitmap_sync
, &rdev
->flags
);
1123 clear_bit(WriteMostly
, &rdev
->flags
);
1125 if (mddev
->raid_disks
== 0) {
1126 mddev
->major_version
= 0;
1127 mddev
->minor_version
= sb
->minor_version
;
1128 mddev
->patch_version
= sb
->patch_version
;
1129 mddev
->external
= 0;
1130 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1131 mddev
->ctime
= sb
->ctime
;
1132 mddev
->utime
= sb
->utime
;
1133 mddev
->level
= sb
->level
;
1134 mddev
->clevel
[0] = 0;
1135 mddev
->layout
= sb
->layout
;
1136 mddev
->raid_disks
= sb
->raid_disks
;
1137 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1138 mddev
->events
= ev1
;
1139 mddev
->bitmap_info
.offset
= 0;
1140 mddev
->bitmap_info
.space
= 0;
1141 /* bitmap can use 60 K after the 4K superblocks */
1142 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1143 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1144 mddev
->reshape_backwards
= 0;
1146 if (mddev
->minor_version
>= 91) {
1147 mddev
->reshape_position
= sb
->reshape_position
;
1148 mddev
->delta_disks
= sb
->delta_disks
;
1149 mddev
->new_level
= sb
->new_level
;
1150 mddev
->new_layout
= sb
->new_layout
;
1151 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1152 if (mddev
->delta_disks
< 0)
1153 mddev
->reshape_backwards
= 1;
1155 mddev
->reshape_position
= MaxSector
;
1156 mddev
->delta_disks
= 0;
1157 mddev
->new_level
= mddev
->level
;
1158 mddev
->new_layout
= mddev
->layout
;
1159 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1162 if (sb
->state
& (1<<MD_SB_CLEAN
))
1163 mddev
->recovery_cp
= MaxSector
;
1165 if (sb
->events_hi
== sb
->cp_events_hi
&&
1166 sb
->events_lo
== sb
->cp_events_lo
) {
1167 mddev
->recovery_cp
= sb
->recovery_cp
;
1169 mddev
->recovery_cp
= 0;
1172 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1173 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1174 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1175 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1177 mddev
->max_disks
= MD_SB_DISKS
;
1179 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1180 mddev
->bitmap_info
.file
== NULL
) {
1181 mddev
->bitmap_info
.offset
=
1182 mddev
->bitmap_info
.default_offset
;
1183 mddev
->bitmap_info
.space
=
1184 mddev
->bitmap_info
.space
;
1187 } else if (mddev
->pers
== NULL
) {
1188 /* Insist on good event counter while assembling, except
1189 * for spares (which don't need an event count) */
1191 if (sb
->disks
[rdev
->desc_nr
].state
& (
1192 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1193 if (ev1
< mddev
->events
)
1195 } else if (mddev
->bitmap
) {
1196 /* if adding to array with a bitmap, then we can accept an
1197 * older device ... but not too old.
1199 if (ev1
< mddev
->bitmap
->events_cleared
)
1201 if (ev1
< mddev
->events
)
1202 set_bit(Bitmap_sync
, &rdev
->flags
);
1204 if (ev1
< mddev
->events
)
1205 /* just a hot-add of a new device, leave raid_disk at -1 */
1209 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1210 desc
= sb
->disks
+ rdev
->desc_nr
;
1212 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1213 set_bit(Faulty
, &rdev
->flags
);
1214 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1215 desc->raid_disk < mddev->raid_disks */) {
1216 set_bit(In_sync
, &rdev
->flags
);
1217 rdev
->raid_disk
= desc
->raid_disk
;
1218 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1219 /* active but not in sync implies recovery up to
1220 * reshape position. We don't know exactly where
1221 * that is, so set to zero for now */
1222 if (mddev
->minor_version
>= 91) {
1223 rdev
->recovery_offset
= 0;
1224 rdev
->raid_disk
= desc
->raid_disk
;
1227 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1228 set_bit(WriteMostly
, &rdev
->flags
);
1229 } else /* MULTIPATH are always insync */
1230 set_bit(In_sync
, &rdev
->flags
);
1235 * sync_super for 0.90.0
1237 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1240 struct md_rdev
*rdev2
;
1241 int next_spare
= mddev
->raid_disks
;
1244 /* make rdev->sb match mddev data..
1247 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1248 * 3/ any empty disks < next_spare become removed
1250 * disks[0] gets initialised to REMOVED because
1251 * we cannot be sure from other fields if it has
1252 * been initialised or not.
1255 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1257 rdev
->sb_size
= MD_SB_BYTES
;
1259 sb
= page_address(rdev
->sb_page
);
1261 memset(sb
, 0, sizeof(*sb
));
1263 sb
->md_magic
= MD_SB_MAGIC
;
1264 sb
->major_version
= mddev
->major_version
;
1265 sb
->patch_version
= mddev
->patch_version
;
1266 sb
->gvalid_words
= 0; /* ignored */
1267 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1268 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1269 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1270 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1272 sb
->ctime
= mddev
->ctime
;
1273 sb
->level
= mddev
->level
;
1274 sb
->size
= mddev
->dev_sectors
/ 2;
1275 sb
->raid_disks
= mddev
->raid_disks
;
1276 sb
->md_minor
= mddev
->md_minor
;
1277 sb
->not_persistent
= 0;
1278 sb
->utime
= mddev
->utime
;
1280 sb
->events_hi
= (mddev
->events
>>32);
1281 sb
->events_lo
= (u32
)mddev
->events
;
1283 if (mddev
->reshape_position
== MaxSector
)
1284 sb
->minor_version
= 90;
1286 sb
->minor_version
= 91;
1287 sb
->reshape_position
= mddev
->reshape_position
;
1288 sb
->new_level
= mddev
->new_level
;
1289 sb
->delta_disks
= mddev
->delta_disks
;
1290 sb
->new_layout
= mddev
->new_layout
;
1291 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1293 mddev
->minor_version
= sb
->minor_version
;
1296 sb
->recovery_cp
= mddev
->recovery_cp
;
1297 sb
->cp_events_hi
= (mddev
->events
>>32);
1298 sb
->cp_events_lo
= (u32
)mddev
->events
;
1299 if (mddev
->recovery_cp
== MaxSector
)
1300 sb
->state
= (1<< MD_SB_CLEAN
);
1302 sb
->recovery_cp
= 0;
1304 sb
->layout
= mddev
->layout
;
1305 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1307 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1308 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1310 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1311 rdev_for_each(rdev2
, mddev
) {
1314 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1316 if (rdev2
->raid_disk
>= 0 &&
1317 sb
->minor_version
>= 91)
1318 /* we have nowhere to store the recovery_offset,
1319 * but if it is not below the reshape_position,
1320 * we can piggy-back on that.
1323 if (rdev2
->raid_disk
< 0 ||
1324 test_bit(Faulty
, &rdev2
->flags
))
1327 desc_nr
= rdev2
->raid_disk
;
1329 desc_nr
= next_spare
++;
1330 rdev2
->desc_nr
= desc_nr
;
1331 d
= &sb
->disks
[rdev2
->desc_nr
];
1333 d
->number
= rdev2
->desc_nr
;
1334 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1335 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1337 d
->raid_disk
= rdev2
->raid_disk
;
1339 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1340 if (test_bit(Faulty
, &rdev2
->flags
))
1341 d
->state
= (1<<MD_DISK_FAULTY
);
1342 else if (is_active
) {
1343 d
->state
= (1<<MD_DISK_ACTIVE
);
1344 if (test_bit(In_sync
, &rdev2
->flags
))
1345 d
->state
|= (1<<MD_DISK_SYNC
);
1353 if (test_bit(WriteMostly
, &rdev2
->flags
))
1354 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1356 /* now set the "removed" and "faulty" bits on any missing devices */
1357 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1358 mdp_disk_t
*d
= &sb
->disks
[i
];
1359 if (d
->state
== 0 && d
->number
== 0) {
1362 d
->state
= (1<<MD_DISK_REMOVED
);
1363 d
->state
|= (1<<MD_DISK_FAULTY
);
1367 sb
->nr_disks
= nr_disks
;
1368 sb
->active_disks
= active
;
1369 sb
->working_disks
= working
;
1370 sb
->failed_disks
= failed
;
1371 sb
->spare_disks
= spare
;
1373 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1374 sb
->sb_csum
= calc_sb_csum(sb
);
1378 * rdev_size_change for 0.90.0
1380 static unsigned long long
1381 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1383 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1384 return 0; /* component must fit device */
1385 if (rdev
->mddev
->bitmap_info
.offset
)
1386 return 0; /* can't move bitmap */
1387 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1388 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1389 num_sectors
= rdev
->sb_start
;
1390 /* Limit to 4TB as metadata cannot record more than that.
1391 * 4TB == 2^32 KB, or 2*2^32 sectors.
1393 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1394 num_sectors
= (2ULL << 32) - 2;
1395 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1397 md_super_wait(rdev
->mddev
);
1402 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1404 /* non-zero offset changes not possible with v0.90 */
1405 return new_offset
== 0;
1409 * version 1 superblock
1412 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1416 unsigned long long newcsum
;
1417 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1418 __le32
*isuper
= (__le32
*)sb
;
1420 disk_csum
= sb
->sb_csum
;
1423 for (; size
>= 4; size
-= 4)
1424 newcsum
+= le32_to_cpu(*isuper
++);
1427 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1429 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1430 sb
->sb_csum
= disk_csum
;
1431 return cpu_to_le32(csum
);
1434 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1436 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1438 struct mdp_superblock_1
*sb
;
1442 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1446 * Calculate the position of the superblock in 512byte sectors.
1447 * It is always aligned to a 4K boundary and
1448 * depeding on minor_version, it can be:
1449 * 0: At least 8K, but less than 12K, from end of device
1450 * 1: At start of device
1451 * 2: 4K from start of device.
1453 switch(minor_version
) {
1455 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1457 sb_start
&= ~(sector_t
)(4*2-1);
1468 rdev
->sb_start
= sb_start
;
1470 /* superblock is rarely larger than 1K, but it can be larger,
1471 * and it is safe to read 4k, so we do that
1473 ret
= read_disk_sb(rdev
, 4096);
1474 if (ret
) return ret
;
1477 sb
= page_address(rdev
->sb_page
);
1479 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1480 sb
->major_version
!= cpu_to_le32(1) ||
1481 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1482 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1483 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1486 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1487 printk("md: invalid superblock checksum on %s\n",
1488 bdevname(rdev
->bdev
,b
));
1491 if (le64_to_cpu(sb
->data_size
) < 10) {
1492 printk("md: data_size too small on %s\n",
1493 bdevname(rdev
->bdev
,b
));
1498 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1499 /* Some padding is non-zero, might be a new feature */
1502 rdev
->preferred_minor
= 0xffff;
1503 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1504 rdev
->new_data_offset
= rdev
->data_offset
;
1505 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1506 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1507 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1508 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1510 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1511 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1512 if (rdev
->sb_size
& bmask
)
1513 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1516 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1519 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1522 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1525 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1527 if (!rdev
->bb_page
) {
1528 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1532 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1533 rdev
->badblocks
.count
== 0) {
1534 /* need to load the bad block list.
1535 * Currently we limit it to one page.
1541 int sectors
= le16_to_cpu(sb
->bblog_size
);
1542 if (sectors
> (PAGE_SIZE
/ 512))
1544 offset
= le32_to_cpu(sb
->bblog_offset
);
1547 bb_sector
= (long long)offset
;
1548 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1549 rdev
->bb_page
, READ
, true))
1551 bbp
= (u64
*)page_address(rdev
->bb_page
);
1552 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1553 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1554 u64 bb
= le64_to_cpu(*bbp
);
1555 int count
= bb
& (0x3ff);
1556 u64 sector
= bb
>> 10;
1557 sector
<<= sb
->bblog_shift
;
1558 count
<<= sb
->bblog_shift
;
1561 if (md_set_badblocks(&rdev
->badblocks
,
1562 sector
, count
, 1) == 0)
1565 } else if (sb
->bblog_offset
!= 0)
1566 rdev
->badblocks
.shift
= 0;
1572 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1574 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1575 sb
->level
!= refsb
->level
||
1576 sb
->layout
!= refsb
->layout
||
1577 sb
->chunksize
!= refsb
->chunksize
) {
1578 printk(KERN_WARNING
"md: %s has strangely different"
1579 " superblock to %s\n",
1580 bdevname(rdev
->bdev
,b
),
1581 bdevname(refdev
->bdev
,b2
));
1584 ev1
= le64_to_cpu(sb
->events
);
1585 ev2
= le64_to_cpu(refsb
->events
);
1592 if (minor_version
) {
1593 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1594 sectors
-= rdev
->data_offset
;
1596 sectors
= rdev
->sb_start
;
1597 if (sectors
< le64_to_cpu(sb
->data_size
))
1599 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1603 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1605 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1606 __u64 ev1
= le64_to_cpu(sb
->events
);
1608 rdev
->raid_disk
= -1;
1609 clear_bit(Faulty
, &rdev
->flags
);
1610 clear_bit(In_sync
, &rdev
->flags
);
1611 clear_bit(Bitmap_sync
, &rdev
->flags
);
1612 clear_bit(WriteMostly
, &rdev
->flags
);
1614 if (mddev
->raid_disks
== 0) {
1615 mddev
->major_version
= 1;
1616 mddev
->patch_version
= 0;
1617 mddev
->external
= 0;
1618 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1619 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1620 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1621 mddev
->level
= le32_to_cpu(sb
->level
);
1622 mddev
->clevel
[0] = 0;
1623 mddev
->layout
= le32_to_cpu(sb
->layout
);
1624 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1625 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1626 mddev
->events
= ev1
;
1627 mddev
->bitmap_info
.offset
= 0;
1628 mddev
->bitmap_info
.space
= 0;
1629 /* Default location for bitmap is 1K after superblock
1630 * using 3K - total of 4K
1632 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1633 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1634 mddev
->reshape_backwards
= 0;
1636 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1637 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1639 mddev
->max_disks
= (4096-256)/2;
1641 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1642 mddev
->bitmap_info
.file
== NULL
) {
1643 mddev
->bitmap_info
.offset
=
1644 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1645 /* Metadata doesn't record how much space is available.
1646 * For 1.0, we assume we can use up to the superblock
1647 * if before, else to 4K beyond superblock.
1648 * For others, assume no change is possible.
1650 if (mddev
->minor_version
> 0)
1651 mddev
->bitmap_info
.space
= 0;
1652 else if (mddev
->bitmap_info
.offset
> 0)
1653 mddev
->bitmap_info
.space
=
1654 8 - mddev
->bitmap_info
.offset
;
1656 mddev
->bitmap_info
.space
=
1657 -mddev
->bitmap_info
.offset
;
1660 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1661 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1662 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1663 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1664 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1665 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1666 if (mddev
->delta_disks
< 0 ||
1667 (mddev
->delta_disks
== 0 &&
1668 (le32_to_cpu(sb
->feature_map
)
1669 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1670 mddev
->reshape_backwards
= 1;
1672 mddev
->reshape_position
= MaxSector
;
1673 mddev
->delta_disks
= 0;
1674 mddev
->new_level
= mddev
->level
;
1675 mddev
->new_layout
= mddev
->layout
;
1676 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1679 } else if (mddev
->pers
== NULL
) {
1680 /* Insist of good event counter while assembling, except for
1681 * spares (which don't need an event count) */
1683 if (rdev
->desc_nr
>= 0 &&
1684 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1685 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1686 if (ev1
< mddev
->events
)
1688 } else if (mddev
->bitmap
) {
1689 /* If adding to array with a bitmap, then we can accept an
1690 * older device, but not too old.
1692 if (ev1
< mddev
->bitmap
->events_cleared
)
1694 if (ev1
< mddev
->events
)
1695 set_bit(Bitmap_sync
, &rdev
->flags
);
1697 if (ev1
< mddev
->events
)
1698 /* just a hot-add of a new device, leave raid_disk at -1 */
1701 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1703 if (rdev
->desc_nr
< 0 ||
1704 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1708 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1710 case 0xffff: /* spare */
1712 case 0xfffe: /* faulty */
1713 set_bit(Faulty
, &rdev
->flags
);
1716 if ((le32_to_cpu(sb
->feature_map
) &
1717 MD_FEATURE_RECOVERY_OFFSET
))
1718 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1720 set_bit(In_sync
, &rdev
->flags
);
1721 rdev
->raid_disk
= role
;
1724 if (sb
->devflags
& WriteMostly1
)
1725 set_bit(WriteMostly
, &rdev
->flags
);
1726 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1727 set_bit(Replacement
, &rdev
->flags
);
1728 } else /* MULTIPATH are always insync */
1729 set_bit(In_sync
, &rdev
->flags
);
1734 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1736 struct mdp_superblock_1
*sb
;
1737 struct md_rdev
*rdev2
;
1739 /* make rdev->sb match mddev and rdev data. */
1741 sb
= page_address(rdev
->sb_page
);
1743 sb
->feature_map
= 0;
1745 sb
->recovery_offset
= cpu_to_le64(0);
1746 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1748 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1749 sb
->events
= cpu_to_le64(mddev
->events
);
1751 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1753 sb
->resync_offset
= cpu_to_le64(0);
1755 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1757 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1758 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1759 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1760 sb
->level
= cpu_to_le32(mddev
->level
);
1761 sb
->layout
= cpu_to_le32(mddev
->layout
);
1763 if (test_bit(WriteMostly
, &rdev
->flags
))
1764 sb
->devflags
|= WriteMostly1
;
1766 sb
->devflags
&= ~WriteMostly1
;
1767 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1768 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1770 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1771 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1772 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1775 if (rdev
->raid_disk
>= 0 &&
1776 !test_bit(In_sync
, &rdev
->flags
)) {
1778 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1779 sb
->recovery_offset
=
1780 cpu_to_le64(rdev
->recovery_offset
);
1782 if (test_bit(Replacement
, &rdev
->flags
))
1784 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1786 if (mddev
->reshape_position
!= MaxSector
) {
1787 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1788 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1789 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1790 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1791 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1792 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1793 if (mddev
->delta_disks
== 0 &&
1794 mddev
->reshape_backwards
)
1796 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1797 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1799 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1800 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1801 - rdev
->data_offset
));
1805 if (rdev
->badblocks
.count
== 0)
1806 /* Nothing to do for bad blocks*/ ;
1807 else if (sb
->bblog_offset
== 0)
1808 /* Cannot record bad blocks on this device */
1809 md_error(mddev
, rdev
);
1811 struct badblocks
*bb
= &rdev
->badblocks
;
1812 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1814 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1819 seq
= read_seqbegin(&bb
->lock
);
1821 memset(bbp
, 0xff, PAGE_SIZE
);
1823 for (i
= 0 ; i
< bb
->count
; i
++) {
1824 u64 internal_bb
= p
[i
];
1825 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1826 | BB_LEN(internal_bb
));
1827 bbp
[i
] = cpu_to_le64(store_bb
);
1830 if (read_seqretry(&bb
->lock
, seq
))
1833 bb
->sector
= (rdev
->sb_start
+
1834 (int)le32_to_cpu(sb
->bblog_offset
));
1835 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1840 rdev_for_each(rdev2
, mddev
)
1841 if (rdev2
->desc_nr
+1 > max_dev
)
1842 max_dev
= rdev2
->desc_nr
+1;
1844 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1846 sb
->max_dev
= cpu_to_le32(max_dev
);
1847 rdev
->sb_size
= max_dev
* 2 + 256;
1848 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1849 if (rdev
->sb_size
& bmask
)
1850 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1852 max_dev
= le32_to_cpu(sb
->max_dev
);
1854 for (i
=0; i
<max_dev
;i
++)
1855 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1857 rdev_for_each(rdev2
, mddev
) {
1859 if (test_bit(Faulty
, &rdev2
->flags
))
1860 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1861 else if (test_bit(In_sync
, &rdev2
->flags
))
1862 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1863 else if (rdev2
->raid_disk
>= 0)
1864 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1866 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1869 sb
->sb_csum
= calc_sb_1_csum(sb
);
1872 static unsigned long long
1873 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1875 struct mdp_superblock_1
*sb
;
1876 sector_t max_sectors
;
1877 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1878 return 0; /* component must fit device */
1879 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1880 return 0; /* too confusing */
1881 if (rdev
->sb_start
< rdev
->data_offset
) {
1882 /* minor versions 1 and 2; superblock before data */
1883 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1884 max_sectors
-= rdev
->data_offset
;
1885 if (!num_sectors
|| num_sectors
> max_sectors
)
1886 num_sectors
= max_sectors
;
1887 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1888 /* minor version 0 with bitmap we can't move */
1891 /* minor version 0; superblock after data */
1893 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1894 sb_start
&= ~(sector_t
)(4*2 - 1);
1895 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1896 if (!num_sectors
|| num_sectors
> max_sectors
)
1897 num_sectors
= max_sectors
;
1898 rdev
->sb_start
= sb_start
;
1900 sb
= page_address(rdev
->sb_page
);
1901 sb
->data_size
= cpu_to_le64(num_sectors
);
1902 sb
->super_offset
= cpu_to_le64(rdev
->sb_start
);
1903 sb
->sb_csum
= calc_sb_1_csum(sb
);
1904 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1906 md_super_wait(rdev
->mddev
);
1912 super_1_allow_new_offset(struct md_rdev
*rdev
,
1913 unsigned long long new_offset
)
1915 /* All necessary checks on new >= old have been done */
1916 struct bitmap
*bitmap
;
1917 if (new_offset
>= rdev
->data_offset
)
1920 /* with 1.0 metadata, there is no metadata to tread on
1921 * so we can always move back */
1922 if (rdev
->mddev
->minor_version
== 0)
1925 /* otherwise we must be sure not to step on
1926 * any metadata, so stay:
1927 * 36K beyond start of superblock
1928 * beyond end of badblocks
1929 * beyond write-intent bitmap
1931 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1933 bitmap
= rdev
->mddev
->bitmap
;
1934 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1935 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1936 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1938 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1944 static struct super_type super_types
[] = {
1947 .owner
= THIS_MODULE
,
1948 .load_super
= super_90_load
,
1949 .validate_super
= super_90_validate
,
1950 .sync_super
= super_90_sync
,
1951 .rdev_size_change
= super_90_rdev_size_change
,
1952 .allow_new_offset
= super_90_allow_new_offset
,
1956 .owner
= THIS_MODULE
,
1957 .load_super
= super_1_load
,
1958 .validate_super
= super_1_validate
,
1959 .sync_super
= super_1_sync
,
1960 .rdev_size_change
= super_1_rdev_size_change
,
1961 .allow_new_offset
= super_1_allow_new_offset
,
1965 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1967 if (mddev
->sync_super
) {
1968 mddev
->sync_super(mddev
, rdev
);
1972 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1974 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1977 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1979 struct md_rdev
*rdev
, *rdev2
;
1982 rdev_for_each_rcu(rdev
, mddev1
)
1983 rdev_for_each_rcu(rdev2
, mddev2
)
1984 if (rdev
->bdev
->bd_contains
==
1985 rdev2
->bdev
->bd_contains
) {
1993 static LIST_HEAD(pending_raid_disks
);
1996 * Try to register data integrity profile for an mddev
1998 * This is called when an array is started and after a disk has been kicked
1999 * from the array. It only succeeds if all working and active component devices
2000 * are integrity capable with matching profiles.
2002 int md_integrity_register(struct mddev
*mddev
)
2004 struct md_rdev
*rdev
, *reference
= NULL
;
2006 if (list_empty(&mddev
->disks
))
2007 return 0; /* nothing to do */
2008 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2009 return 0; /* shouldn't register, or already is */
2010 rdev_for_each(rdev
, mddev
) {
2011 /* skip spares and non-functional disks */
2012 if (test_bit(Faulty
, &rdev
->flags
))
2014 if (rdev
->raid_disk
< 0)
2017 /* Use the first rdev as the reference */
2021 /* does this rdev's profile match the reference profile? */
2022 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2023 rdev
->bdev
->bd_disk
) < 0)
2026 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2029 * All component devices are integrity capable and have matching
2030 * profiles, register the common profile for the md device.
2032 if (blk_integrity_register(mddev
->gendisk
,
2033 bdev_get_integrity(reference
->bdev
)) != 0) {
2034 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2038 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2039 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2040 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2046 EXPORT_SYMBOL(md_integrity_register
);
2048 /* Disable data integrity if non-capable/non-matching disk is being added */
2049 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2051 struct blk_integrity
*bi_rdev
;
2052 struct blk_integrity
*bi_mddev
;
2054 if (!mddev
->gendisk
)
2057 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2058 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2060 if (!bi_mddev
) /* nothing to do */
2062 if (rdev
->raid_disk
< 0) /* skip spares */
2064 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2065 rdev
->bdev
->bd_disk
) >= 0)
2067 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2068 blk_integrity_unregister(mddev
->gendisk
);
2070 EXPORT_SYMBOL(md_integrity_add_rdev
);
2072 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2074 char b
[BDEVNAME_SIZE
];
2084 /* prevent duplicates */
2085 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2088 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2089 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2090 rdev
->sectors
< mddev
->dev_sectors
)) {
2092 /* Cannot change size, so fail
2093 * If mddev->level <= 0, then we don't care
2094 * about aligning sizes (e.g. linear)
2096 if (mddev
->level
> 0)
2099 mddev
->dev_sectors
= rdev
->sectors
;
2102 /* Verify rdev->desc_nr is unique.
2103 * If it is -1, assign a free number, else
2104 * check number is not in use
2106 if (rdev
->desc_nr
< 0) {
2108 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2109 while (find_rdev_nr(mddev
, choice
))
2111 rdev
->desc_nr
= choice
;
2113 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2116 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2117 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2118 mdname(mddev
), mddev
->max_disks
);
2121 bdevname(rdev
->bdev
,b
);
2122 while ( (s
=strchr(b
, '/')) != NULL
)
2125 rdev
->mddev
= mddev
;
2126 printk(KERN_INFO
"md: bind<%s>\n", b
);
2128 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2131 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2132 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2133 /* failure here is OK */;
2134 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2136 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2137 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2139 /* May as well allow recovery to be retried once */
2140 mddev
->recovery_disabled
++;
2145 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2150 static void md_delayed_delete(struct work_struct
*ws
)
2152 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2153 kobject_del(&rdev
->kobj
);
2154 kobject_put(&rdev
->kobj
);
2157 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2159 char b
[BDEVNAME_SIZE
];
2164 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2165 list_del_rcu(&rdev
->same_set
);
2166 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2168 sysfs_remove_link(&rdev
->kobj
, "block");
2169 sysfs_put(rdev
->sysfs_state
);
2170 rdev
->sysfs_state
= NULL
;
2171 rdev
->badblocks
.count
= 0;
2172 /* We need to delay this, otherwise we can deadlock when
2173 * writing to 'remove' to "dev/state". We also need
2174 * to delay it due to rcu usage.
2177 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2178 kobject_get(&rdev
->kobj
);
2179 queue_work(md_misc_wq
, &rdev
->del_work
);
2183 * prevent the device from being mounted, repartitioned or
2184 * otherwise reused by a RAID array (or any other kernel
2185 * subsystem), by bd_claiming the device.
2187 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2190 struct block_device
*bdev
;
2191 char b
[BDEVNAME_SIZE
];
2193 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2194 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2196 printk(KERN_ERR
"md: could not open %s.\n",
2197 __bdevname(dev
, b
));
2198 return PTR_ERR(bdev
);
2204 static void unlock_rdev(struct md_rdev
*rdev
)
2206 struct block_device
*bdev
= rdev
->bdev
;
2210 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2213 void md_autodetect_dev(dev_t dev
);
2215 static void export_rdev(struct md_rdev
* rdev
)
2217 char b
[BDEVNAME_SIZE
];
2218 printk(KERN_INFO
"md: export_rdev(%s)\n",
2219 bdevname(rdev
->bdev
,b
));
2222 md_rdev_clear(rdev
);
2224 if (test_bit(AutoDetected
, &rdev
->flags
))
2225 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2228 kobject_put(&rdev
->kobj
);
2231 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2233 unbind_rdev_from_array(rdev
);
2237 static void export_array(struct mddev
*mddev
)
2239 struct md_rdev
*rdev
, *tmp
;
2241 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2246 kick_rdev_from_array(rdev
);
2248 if (!list_empty(&mddev
->disks
))
2250 mddev
->raid_disks
= 0;
2251 mddev
->major_version
= 0;
2254 static void print_desc(mdp_disk_t
*desc
)
2256 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2257 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2260 static void print_sb_90(mdp_super_t
*sb
)
2265 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2266 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2267 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2269 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2270 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2271 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2272 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2273 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2274 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2275 sb
->failed_disks
, sb
->spare_disks
,
2276 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2279 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2282 desc
= sb
->disks
+ i
;
2283 if (desc
->number
|| desc
->major
|| desc
->minor
||
2284 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2285 printk(" D %2d: ", i
);
2289 printk(KERN_INFO
"md: THIS: ");
2290 print_desc(&sb
->this_disk
);
2293 static void print_sb_1(struct mdp_superblock_1
*sb
)
2297 uuid
= sb
->set_uuid
;
2299 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2300 "md: Name: \"%s\" CT:%llu\n",
2301 le32_to_cpu(sb
->major_version
),
2302 le32_to_cpu(sb
->feature_map
),
2305 (unsigned long long)le64_to_cpu(sb
->ctime
)
2306 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2308 uuid
= sb
->device_uuid
;
2310 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2312 "md: Dev:%08x UUID: %pU\n"
2313 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2314 "md: (MaxDev:%u) \n",
2315 le32_to_cpu(sb
->level
),
2316 (unsigned long long)le64_to_cpu(sb
->size
),
2317 le32_to_cpu(sb
->raid_disks
),
2318 le32_to_cpu(sb
->layout
),
2319 le32_to_cpu(sb
->chunksize
),
2320 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2321 (unsigned long long)le64_to_cpu(sb
->data_size
),
2322 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2323 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2324 le32_to_cpu(sb
->dev_number
),
2327 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2328 (unsigned long long)le64_to_cpu(sb
->events
),
2329 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2330 le32_to_cpu(sb
->sb_csum
),
2331 le32_to_cpu(sb
->max_dev
)
2335 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2337 char b
[BDEVNAME_SIZE
];
2338 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2339 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2340 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2342 if (rdev
->sb_loaded
) {
2343 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2344 switch (major_version
) {
2346 print_sb_90(page_address(rdev
->sb_page
));
2349 print_sb_1(page_address(rdev
->sb_page
));
2353 printk(KERN_INFO
"md: no rdev superblock!\n");
2356 static void md_print_devices(void)
2358 struct list_head
*tmp
;
2359 struct md_rdev
*rdev
;
2360 struct mddev
*mddev
;
2361 char b
[BDEVNAME_SIZE
];
2364 printk("md: **********************************\n");
2365 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2366 printk("md: **********************************\n");
2367 for_each_mddev(mddev
, tmp
) {
2370 bitmap_print_sb(mddev
->bitmap
);
2372 printk("%s: ", mdname(mddev
));
2373 rdev_for_each(rdev
, mddev
)
2374 printk("<%s>", bdevname(rdev
->bdev
,b
));
2377 rdev_for_each(rdev
, mddev
)
2378 print_rdev(rdev
, mddev
->major_version
);
2380 printk("md: **********************************\n");
2385 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2387 /* Update each superblock (in-memory image), but
2388 * if we are allowed to, skip spares which already
2389 * have the right event counter, or have one earlier
2390 * (which would mean they aren't being marked as dirty
2391 * with the rest of the array)
2393 struct md_rdev
*rdev
;
2394 rdev_for_each(rdev
, mddev
) {
2395 if (rdev
->sb_events
== mddev
->events
||
2397 rdev
->raid_disk
< 0 &&
2398 rdev
->sb_events
+1 == mddev
->events
)) {
2399 /* Don't update this superblock */
2400 rdev
->sb_loaded
= 2;
2402 sync_super(mddev
, rdev
);
2403 rdev
->sb_loaded
= 1;
2408 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2410 struct md_rdev
*rdev
;
2413 int any_badblocks_changed
= 0;
2417 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2421 /* First make sure individual recovery_offsets are correct */
2422 rdev_for_each(rdev
, mddev
) {
2423 if (rdev
->raid_disk
>= 0 &&
2424 mddev
->delta_disks
>= 0 &&
2425 !test_bit(In_sync
, &rdev
->flags
) &&
2426 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2427 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2430 if (!mddev
->persistent
) {
2431 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2432 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2433 if (!mddev
->external
) {
2434 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2435 rdev_for_each(rdev
, mddev
) {
2436 if (rdev
->badblocks
.changed
) {
2437 rdev
->badblocks
.changed
= 0;
2438 md_ack_all_badblocks(&rdev
->badblocks
);
2439 md_error(mddev
, rdev
);
2441 clear_bit(Blocked
, &rdev
->flags
);
2442 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2443 wake_up(&rdev
->blocked_wait
);
2446 wake_up(&mddev
->sb_wait
);
2450 spin_lock_irq(&mddev
->write_lock
);
2452 mddev
->utime
= get_seconds();
2454 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2456 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2457 /* just a clean<-> dirty transition, possibly leave spares alone,
2458 * though if events isn't the right even/odd, we will have to do
2464 if (mddev
->degraded
)
2465 /* If the array is degraded, then skipping spares is both
2466 * dangerous and fairly pointless.
2467 * Dangerous because a device that was removed from the array
2468 * might have a event_count that still looks up-to-date,
2469 * so it can be re-added without a resync.
2470 * Pointless because if there are any spares to skip,
2471 * then a recovery will happen and soon that array won't
2472 * be degraded any more and the spare can go back to sleep then.
2476 sync_req
= mddev
->in_sync
;
2478 /* If this is just a dirty<->clean transition, and the array is clean
2479 * and 'events' is odd, we can roll back to the previous clean state */
2481 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2482 && mddev
->can_decrease_events
2483 && mddev
->events
!= 1) {
2485 mddev
->can_decrease_events
= 0;
2487 /* otherwise we have to go forward and ... */
2489 mddev
->can_decrease_events
= nospares
;
2492 if (!mddev
->events
) {
2494 * oops, this 64-bit counter should never wrap.
2495 * Either we are in around ~1 trillion A.C., assuming
2496 * 1 reboot per second, or we have a bug:
2502 rdev_for_each(rdev
, mddev
) {
2503 if (rdev
->badblocks
.changed
)
2504 any_badblocks_changed
++;
2505 if (test_bit(Faulty
, &rdev
->flags
))
2506 set_bit(FaultRecorded
, &rdev
->flags
);
2509 sync_sbs(mddev
, nospares
);
2510 spin_unlock_irq(&mddev
->write_lock
);
2512 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2513 mdname(mddev
), mddev
->in_sync
);
2515 bitmap_update_sb(mddev
->bitmap
);
2516 rdev_for_each(rdev
, mddev
) {
2517 char b
[BDEVNAME_SIZE
];
2519 if (rdev
->sb_loaded
!= 1)
2520 continue; /* no noise on spare devices */
2522 if (!test_bit(Faulty
, &rdev
->flags
) &&
2523 rdev
->saved_raid_disk
== -1) {
2524 md_super_write(mddev
,rdev
,
2525 rdev
->sb_start
, rdev
->sb_size
,
2527 pr_debug("md: (write) %s's sb offset: %llu\n",
2528 bdevname(rdev
->bdev
, b
),
2529 (unsigned long long)rdev
->sb_start
);
2530 rdev
->sb_events
= mddev
->events
;
2531 if (rdev
->badblocks
.size
) {
2532 md_super_write(mddev
, rdev
,
2533 rdev
->badblocks
.sector
,
2534 rdev
->badblocks
.size
<< 9,
2536 rdev
->badblocks
.size
= 0;
2539 } else if (test_bit(Faulty
, &rdev
->flags
))
2540 pr_debug("md: %s (skipping faulty)\n",
2541 bdevname(rdev
->bdev
, b
));
2543 pr_debug("(skipping incremental s/r ");
2545 if (mddev
->level
== LEVEL_MULTIPATH
)
2546 /* only need to write one superblock... */
2549 md_super_wait(mddev
);
2550 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2552 spin_lock_irq(&mddev
->write_lock
);
2553 if (mddev
->in_sync
!= sync_req
||
2554 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2555 /* have to write it out again */
2556 spin_unlock_irq(&mddev
->write_lock
);
2559 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2560 spin_unlock_irq(&mddev
->write_lock
);
2561 wake_up(&mddev
->sb_wait
);
2562 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2563 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2565 rdev_for_each(rdev
, mddev
) {
2566 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2567 clear_bit(Blocked
, &rdev
->flags
);
2569 if (any_badblocks_changed
)
2570 md_ack_all_badblocks(&rdev
->badblocks
);
2571 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2572 wake_up(&rdev
->blocked_wait
);
2576 /* words written to sysfs files may, or may not, be \n terminated.
2577 * We want to accept with case. For this we use cmd_match.
2579 static int cmd_match(const char *cmd
, const char *str
)
2581 /* See if cmd, written into a sysfs file, matches
2582 * str. They must either be the same, or cmd can
2583 * have a trailing newline
2585 while (*cmd
&& *str
&& *cmd
== *str
) {
2596 struct rdev_sysfs_entry
{
2597 struct attribute attr
;
2598 ssize_t (*show
)(struct md_rdev
*, char *);
2599 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2603 state_show(struct md_rdev
*rdev
, char *page
)
2608 if (test_bit(Faulty
, &rdev
->flags
) ||
2609 rdev
->badblocks
.unacked_exist
) {
2610 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2613 if (test_bit(In_sync
, &rdev
->flags
)) {
2614 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2617 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2618 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2621 if (test_bit(Blocked
, &rdev
->flags
) ||
2622 (rdev
->badblocks
.unacked_exist
2623 && !test_bit(Faulty
, &rdev
->flags
))) {
2624 len
+= sprintf(page
+len
, "%sblocked", sep
);
2627 if (!test_bit(Faulty
, &rdev
->flags
) &&
2628 !test_bit(In_sync
, &rdev
->flags
)) {
2629 len
+= sprintf(page
+len
, "%sspare", sep
);
2632 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2633 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2636 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2637 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2640 if (test_bit(Replacement
, &rdev
->flags
)) {
2641 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2645 return len
+sprintf(page
+len
, "\n");
2649 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2652 * faulty - simulates an error
2653 * remove - disconnects the device
2654 * writemostly - sets write_mostly
2655 * -writemostly - clears write_mostly
2656 * blocked - sets the Blocked flags
2657 * -blocked - clears the Blocked and possibly simulates an error
2658 * insync - sets Insync providing device isn't active
2659 * write_error - sets WriteErrorSeen
2660 * -write_error - clears WriteErrorSeen
2663 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2664 md_error(rdev
->mddev
, rdev
);
2665 if (test_bit(Faulty
, &rdev
->flags
))
2669 } else if (cmd_match(buf
, "remove")) {
2670 if (rdev
->raid_disk
>= 0)
2673 struct mddev
*mddev
= rdev
->mddev
;
2674 kick_rdev_from_array(rdev
);
2676 md_update_sb(mddev
, 1);
2677 md_new_event(mddev
);
2680 } else if (cmd_match(buf
, "writemostly")) {
2681 set_bit(WriteMostly
, &rdev
->flags
);
2683 } else if (cmd_match(buf
, "-writemostly")) {
2684 clear_bit(WriteMostly
, &rdev
->flags
);
2686 } else if (cmd_match(buf
, "blocked")) {
2687 set_bit(Blocked
, &rdev
->flags
);
2689 } else if (cmd_match(buf
, "-blocked")) {
2690 if (!test_bit(Faulty
, &rdev
->flags
) &&
2691 rdev
->badblocks
.unacked_exist
) {
2692 /* metadata handler doesn't understand badblocks,
2693 * so we need to fail the device
2695 md_error(rdev
->mddev
, rdev
);
2697 clear_bit(Blocked
, &rdev
->flags
);
2698 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2699 wake_up(&rdev
->blocked_wait
);
2700 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2701 md_wakeup_thread(rdev
->mddev
->thread
);
2704 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2705 set_bit(In_sync
, &rdev
->flags
);
2707 } else if (cmd_match(buf
, "write_error")) {
2708 set_bit(WriteErrorSeen
, &rdev
->flags
);
2710 } else if (cmd_match(buf
, "-write_error")) {
2711 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2713 } else if (cmd_match(buf
, "want_replacement")) {
2714 /* Any non-spare device that is not a replacement can
2715 * become want_replacement at any time, but we then need to
2716 * check if recovery is needed.
2718 if (rdev
->raid_disk
>= 0 &&
2719 !test_bit(Replacement
, &rdev
->flags
))
2720 set_bit(WantReplacement
, &rdev
->flags
);
2721 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2722 md_wakeup_thread(rdev
->mddev
->thread
);
2724 } else if (cmd_match(buf
, "-want_replacement")) {
2725 /* Clearing 'want_replacement' is always allowed.
2726 * Once replacements starts it is too late though.
2729 clear_bit(WantReplacement
, &rdev
->flags
);
2730 } else if (cmd_match(buf
, "replacement")) {
2731 /* Can only set a device as a replacement when array has not
2732 * yet been started. Once running, replacement is automatic
2733 * from spares, or by assigning 'slot'.
2735 if (rdev
->mddev
->pers
)
2738 set_bit(Replacement
, &rdev
->flags
);
2741 } else if (cmd_match(buf
, "-replacement")) {
2742 /* Similarly, can only clear Replacement before start */
2743 if (rdev
->mddev
->pers
)
2746 clear_bit(Replacement
, &rdev
->flags
);
2751 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2752 return err
? err
: len
;
2754 static struct rdev_sysfs_entry rdev_state
=
2755 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2758 errors_show(struct md_rdev
*rdev
, char *page
)
2760 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2764 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2767 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2768 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2769 atomic_set(&rdev
->corrected_errors
, n
);
2774 static struct rdev_sysfs_entry rdev_errors
=
2775 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2778 slot_show(struct md_rdev
*rdev
, char *page
)
2780 if (rdev
->raid_disk
< 0)
2781 return sprintf(page
, "none\n");
2783 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2787 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2791 int slot
= simple_strtoul(buf
, &e
, 10);
2792 if (strncmp(buf
, "none", 4)==0)
2794 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2796 if (rdev
->mddev
->pers
&& slot
== -1) {
2797 /* Setting 'slot' on an active array requires also
2798 * updating the 'rd%d' link, and communicating
2799 * with the personality with ->hot_*_disk.
2800 * For now we only support removing
2801 * failed/spare devices. This normally happens automatically,
2802 * but not when the metadata is externally managed.
2804 if (rdev
->raid_disk
== -1)
2806 /* personality does all needed checks */
2807 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2809 clear_bit(Blocked
, &rdev
->flags
);
2810 remove_and_add_spares(rdev
->mddev
, rdev
);
2811 if (rdev
->raid_disk
>= 0)
2813 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2814 md_wakeup_thread(rdev
->mddev
->thread
);
2815 } else if (rdev
->mddev
->pers
) {
2816 /* Activating a spare .. or possibly reactivating
2817 * if we ever get bitmaps working here.
2820 if (rdev
->raid_disk
!= -1)
2823 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2826 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2829 if (slot
>= rdev
->mddev
->raid_disks
&&
2830 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2833 rdev
->raid_disk
= slot
;
2834 if (test_bit(In_sync
, &rdev
->flags
))
2835 rdev
->saved_raid_disk
= slot
;
2837 rdev
->saved_raid_disk
= -1;
2838 clear_bit(In_sync
, &rdev
->flags
);
2839 clear_bit(Bitmap_sync
, &rdev
->flags
);
2840 err
= rdev
->mddev
->pers
->
2841 hot_add_disk(rdev
->mddev
, rdev
);
2843 rdev
->raid_disk
= -1;
2846 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2847 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2848 /* failure here is OK */;
2849 /* don't wakeup anyone, leave that to userspace. */
2851 if (slot
>= rdev
->mddev
->raid_disks
&&
2852 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2854 rdev
->raid_disk
= slot
;
2855 /* assume it is working */
2856 clear_bit(Faulty
, &rdev
->flags
);
2857 clear_bit(WriteMostly
, &rdev
->flags
);
2858 set_bit(In_sync
, &rdev
->flags
);
2859 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2865 static struct rdev_sysfs_entry rdev_slot
=
2866 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2869 offset_show(struct md_rdev
*rdev
, char *page
)
2871 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2875 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2877 unsigned long long offset
;
2878 if (strict_strtoull(buf
, 10, &offset
) < 0)
2880 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2882 if (rdev
->sectors
&& rdev
->mddev
->external
)
2883 /* Must set offset before size, so overlap checks
2886 rdev
->data_offset
= offset
;
2887 rdev
->new_data_offset
= offset
;
2891 static struct rdev_sysfs_entry rdev_offset
=
2892 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2894 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2896 return sprintf(page
, "%llu\n",
2897 (unsigned long long)rdev
->new_data_offset
);
2900 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2901 const char *buf
, size_t len
)
2903 unsigned long long new_offset
;
2904 struct mddev
*mddev
= rdev
->mddev
;
2906 if (strict_strtoull(buf
, 10, &new_offset
) < 0)
2909 if (mddev
->sync_thread
)
2911 if (new_offset
== rdev
->data_offset
)
2912 /* reset is always permitted */
2914 else if (new_offset
> rdev
->data_offset
) {
2915 /* must not push array size beyond rdev_sectors */
2916 if (new_offset
- rdev
->data_offset
2917 + mddev
->dev_sectors
> rdev
->sectors
)
2920 /* Metadata worries about other space details. */
2922 /* decreasing the offset is inconsistent with a backwards
2925 if (new_offset
< rdev
->data_offset
&&
2926 mddev
->reshape_backwards
)
2928 /* Increasing offset is inconsistent with forwards
2929 * reshape. reshape_direction should be set to
2930 * 'backwards' first.
2932 if (new_offset
> rdev
->data_offset
&&
2933 !mddev
->reshape_backwards
)
2936 if (mddev
->pers
&& mddev
->persistent
&&
2937 !super_types
[mddev
->major_version
]
2938 .allow_new_offset(rdev
, new_offset
))
2940 rdev
->new_data_offset
= new_offset
;
2941 if (new_offset
> rdev
->data_offset
)
2942 mddev
->reshape_backwards
= 1;
2943 else if (new_offset
< rdev
->data_offset
)
2944 mddev
->reshape_backwards
= 0;
2948 static struct rdev_sysfs_entry rdev_new_offset
=
2949 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2952 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2954 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2957 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2959 /* check if two start/length pairs overlap */
2967 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2969 unsigned long long blocks
;
2972 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2975 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2976 return -EINVAL
; /* sector conversion overflow */
2979 if (new != blocks
* 2)
2980 return -EINVAL
; /* unsigned long long to sector_t overflow */
2987 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2989 struct mddev
*my_mddev
= rdev
->mddev
;
2990 sector_t oldsectors
= rdev
->sectors
;
2993 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2995 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2996 return -EINVAL
; /* too confusing */
2997 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2998 if (my_mddev
->persistent
) {
2999 sectors
= super_types
[my_mddev
->major_version
].
3000 rdev_size_change(rdev
, sectors
);
3003 } else if (!sectors
)
3004 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3006 if (!my_mddev
->pers
->resize
)
3007 /* Cannot change size for RAID0 or Linear etc */
3010 if (sectors
< my_mddev
->dev_sectors
)
3011 return -EINVAL
; /* component must fit device */
3013 rdev
->sectors
= sectors
;
3014 if (sectors
> oldsectors
&& my_mddev
->external
) {
3015 /* need to check that all other rdevs with the same ->bdev
3016 * do not overlap. We need to unlock the mddev to avoid
3017 * a deadlock. We have already changed rdev->sectors, and if
3018 * we have to change it back, we will have the lock again.
3020 struct mddev
*mddev
;
3022 struct list_head
*tmp
;
3024 mddev_unlock(my_mddev
);
3025 for_each_mddev(mddev
, tmp
) {
3026 struct md_rdev
*rdev2
;
3029 rdev_for_each(rdev2
, mddev
)
3030 if (rdev
->bdev
== rdev2
->bdev
&&
3032 overlaps(rdev
->data_offset
, rdev
->sectors
,
3038 mddev_unlock(mddev
);
3044 mddev_lock(my_mddev
);
3046 /* Someone else could have slipped in a size
3047 * change here, but doing so is just silly.
3048 * We put oldsectors back because we *know* it is
3049 * safe, and trust userspace not to race with
3052 rdev
->sectors
= oldsectors
;
3059 static struct rdev_sysfs_entry rdev_size
=
3060 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3063 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3065 unsigned long long recovery_start
= rdev
->recovery_offset
;
3067 if (test_bit(In_sync
, &rdev
->flags
) ||
3068 recovery_start
== MaxSector
)
3069 return sprintf(page
, "none\n");
3071 return sprintf(page
, "%llu\n", recovery_start
);
3074 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3076 unsigned long long recovery_start
;
3078 if (cmd_match(buf
, "none"))
3079 recovery_start
= MaxSector
;
3080 else if (strict_strtoull(buf
, 10, &recovery_start
))
3083 if (rdev
->mddev
->pers
&&
3084 rdev
->raid_disk
>= 0)
3087 rdev
->recovery_offset
= recovery_start
;
3088 if (recovery_start
== MaxSector
)
3089 set_bit(In_sync
, &rdev
->flags
);
3091 clear_bit(In_sync
, &rdev
->flags
);
3095 static struct rdev_sysfs_entry rdev_recovery_start
=
3096 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3100 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3102 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3104 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3106 return badblocks_show(&rdev
->badblocks
, page
, 0);
3108 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3110 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3111 /* Maybe that ack was all we needed */
3112 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3113 wake_up(&rdev
->blocked_wait
);
3116 static struct rdev_sysfs_entry rdev_bad_blocks
=
3117 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3120 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3122 return badblocks_show(&rdev
->badblocks
, page
, 1);
3124 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3126 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3128 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3129 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3131 static struct attribute
*rdev_default_attrs
[] = {
3136 &rdev_new_offset
.attr
,
3138 &rdev_recovery_start
.attr
,
3139 &rdev_bad_blocks
.attr
,
3140 &rdev_unack_bad_blocks
.attr
,
3144 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3146 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3147 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3148 struct mddev
*mddev
= rdev
->mddev
;
3154 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3156 if (rdev
->mddev
== NULL
)
3159 rv
= entry
->show(rdev
, page
);
3160 mddev_unlock(mddev
);
3166 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3167 const char *page
, size_t length
)
3169 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3170 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3172 struct mddev
*mddev
= rdev
->mddev
;
3176 if (!capable(CAP_SYS_ADMIN
))
3178 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3180 if (rdev
->mddev
== NULL
)
3183 rv
= entry
->store(rdev
, page
, length
);
3184 mddev_unlock(mddev
);
3189 static void rdev_free(struct kobject
*ko
)
3191 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3194 static const struct sysfs_ops rdev_sysfs_ops
= {
3195 .show
= rdev_attr_show
,
3196 .store
= rdev_attr_store
,
3198 static struct kobj_type rdev_ktype
= {
3199 .release
= rdev_free
,
3200 .sysfs_ops
= &rdev_sysfs_ops
,
3201 .default_attrs
= rdev_default_attrs
,
3204 int md_rdev_init(struct md_rdev
*rdev
)
3207 rdev
->saved_raid_disk
= -1;
3208 rdev
->raid_disk
= -1;
3210 rdev
->data_offset
= 0;
3211 rdev
->new_data_offset
= 0;
3212 rdev
->sb_events
= 0;
3213 rdev
->last_read_error
.tv_sec
= 0;
3214 rdev
->last_read_error
.tv_nsec
= 0;
3215 rdev
->sb_loaded
= 0;
3216 rdev
->bb_page
= NULL
;
3217 atomic_set(&rdev
->nr_pending
, 0);
3218 atomic_set(&rdev
->read_errors
, 0);
3219 atomic_set(&rdev
->corrected_errors
, 0);
3221 INIT_LIST_HEAD(&rdev
->same_set
);
3222 init_waitqueue_head(&rdev
->blocked_wait
);
3224 /* Add space to store bad block list.
3225 * This reserves the space even on arrays where it cannot
3226 * be used - I wonder if that matters
3228 rdev
->badblocks
.count
= 0;
3229 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3230 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3231 seqlock_init(&rdev
->badblocks
.lock
);
3232 if (rdev
->badblocks
.page
== NULL
)
3237 EXPORT_SYMBOL_GPL(md_rdev_init
);
3239 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3241 * mark the device faulty if:
3243 * - the device is nonexistent (zero size)
3244 * - the device has no valid superblock
3246 * a faulty rdev _never_ has rdev->sb set.
3248 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3250 char b
[BDEVNAME_SIZE
];
3252 struct md_rdev
*rdev
;
3255 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3257 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3258 return ERR_PTR(-ENOMEM
);
3261 err
= md_rdev_init(rdev
);
3264 err
= alloc_disk_sb(rdev
);
3268 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3272 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3274 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3277 "md: %s has zero or unknown size, marking faulty!\n",
3278 bdevname(rdev
->bdev
,b
));
3283 if (super_format
>= 0) {
3284 err
= super_types
[super_format
].
3285 load_super(rdev
, NULL
, super_minor
);
3286 if (err
== -EINVAL
) {
3288 "md: %s does not have a valid v%d.%d "
3289 "superblock, not importing!\n",
3290 bdevname(rdev
->bdev
,b
),
3291 super_format
, super_minor
);
3296 "md: could not read %s's sb, not importing!\n",
3297 bdevname(rdev
->bdev
,b
));
3307 md_rdev_clear(rdev
);
3309 return ERR_PTR(err
);
3313 * Check a full RAID array for plausibility
3317 static void analyze_sbs(struct mddev
* mddev
)
3320 struct md_rdev
*rdev
, *freshest
, *tmp
;
3321 char b
[BDEVNAME_SIZE
];
3324 rdev_for_each_safe(rdev
, tmp
, mddev
)
3325 switch (super_types
[mddev
->major_version
].
3326 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3334 "md: fatal superblock inconsistency in %s"
3335 " -- removing from array\n",
3336 bdevname(rdev
->bdev
,b
));
3337 kick_rdev_from_array(rdev
);
3341 super_types
[mddev
->major_version
].
3342 validate_super(mddev
, freshest
);
3345 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3346 if (mddev
->max_disks
&&
3347 (rdev
->desc_nr
>= mddev
->max_disks
||
3348 i
> mddev
->max_disks
)) {
3350 "md: %s: %s: only %d devices permitted\n",
3351 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3353 kick_rdev_from_array(rdev
);
3356 if (rdev
!= freshest
)
3357 if (super_types
[mddev
->major_version
].
3358 validate_super(mddev
, rdev
)) {
3359 printk(KERN_WARNING
"md: kicking non-fresh %s"
3361 bdevname(rdev
->bdev
,b
));
3362 kick_rdev_from_array(rdev
);
3365 if (mddev
->level
== LEVEL_MULTIPATH
) {
3366 rdev
->desc_nr
= i
++;
3367 rdev
->raid_disk
= rdev
->desc_nr
;
3368 set_bit(In_sync
, &rdev
->flags
);
3369 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3370 rdev
->raid_disk
= -1;
3371 clear_bit(In_sync
, &rdev
->flags
);
3376 /* Read a fixed-point number.
3377 * Numbers in sysfs attributes should be in "standard" units where
3378 * possible, so time should be in seconds.
3379 * However we internally use a a much smaller unit such as
3380 * milliseconds or jiffies.
3381 * This function takes a decimal number with a possible fractional
3382 * component, and produces an integer which is the result of
3383 * multiplying that number by 10^'scale'.
3384 * all without any floating-point arithmetic.
3386 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3388 unsigned long result
= 0;
3390 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3393 else if (decimals
< scale
) {
3396 result
= result
* 10 + value
;
3408 while (decimals
< scale
) {
3417 static void md_safemode_timeout(unsigned long data
);
3420 safe_delay_show(struct mddev
*mddev
, char *page
)
3422 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3423 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3426 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3430 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3433 mddev
->safemode_delay
= 0;
3435 unsigned long old_delay
= mddev
->safemode_delay
;
3436 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3437 if (mddev
->safemode_delay
== 0)
3438 mddev
->safemode_delay
= 1;
3439 if (mddev
->safemode_delay
< old_delay
)
3440 md_safemode_timeout((unsigned long)mddev
);
3444 static struct md_sysfs_entry md_safe_delay
=
3445 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3448 level_show(struct mddev
*mddev
, char *page
)
3450 struct md_personality
*p
= mddev
->pers
;
3452 return sprintf(page
, "%s\n", p
->name
);
3453 else if (mddev
->clevel
[0])
3454 return sprintf(page
, "%s\n", mddev
->clevel
);
3455 else if (mddev
->level
!= LEVEL_NONE
)
3456 return sprintf(page
, "%d\n", mddev
->level
);
3462 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3466 struct md_personality
*pers
;
3469 struct md_rdev
*rdev
;
3471 if (mddev
->pers
== NULL
) {
3474 if (len
>= sizeof(mddev
->clevel
))
3476 strncpy(mddev
->clevel
, buf
, len
);
3477 if (mddev
->clevel
[len
-1] == '\n')
3479 mddev
->clevel
[len
] = 0;
3480 mddev
->level
= LEVEL_NONE
;
3484 /* request to change the personality. Need to ensure:
3485 * - array is not engaged in resync/recovery/reshape
3486 * - old personality can be suspended
3487 * - new personality will access other array.
3490 if (mddev
->sync_thread
||
3491 mddev
->reshape_position
!= MaxSector
||
3492 mddev
->sysfs_active
)
3495 if (!mddev
->pers
->quiesce
) {
3496 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3497 mdname(mddev
), mddev
->pers
->name
);
3501 /* Now find the new personality */
3502 if (len
== 0 || len
>= sizeof(clevel
))
3504 strncpy(clevel
, buf
, len
);
3505 if (clevel
[len
-1] == '\n')
3508 if (strict_strtol(clevel
, 10, &level
))
3511 if (request_module("md-%s", clevel
) != 0)
3512 request_module("md-level-%s", clevel
);
3513 spin_lock(&pers_lock
);
3514 pers
= find_pers(level
, clevel
);
3515 if (!pers
|| !try_module_get(pers
->owner
)) {
3516 spin_unlock(&pers_lock
);
3517 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3520 spin_unlock(&pers_lock
);
3522 if (pers
== mddev
->pers
) {
3523 /* Nothing to do! */
3524 module_put(pers
->owner
);
3527 if (!pers
->takeover
) {
3528 module_put(pers
->owner
);
3529 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3530 mdname(mddev
), clevel
);
3534 rdev_for_each(rdev
, mddev
)
3535 rdev
->new_raid_disk
= rdev
->raid_disk
;
3537 /* ->takeover must set new_* and/or delta_disks
3538 * if it succeeds, and may set them when it fails.
3540 priv
= pers
->takeover(mddev
);
3542 mddev
->new_level
= mddev
->level
;
3543 mddev
->new_layout
= mddev
->layout
;
3544 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3545 mddev
->raid_disks
-= mddev
->delta_disks
;
3546 mddev
->delta_disks
= 0;
3547 mddev
->reshape_backwards
= 0;
3548 module_put(pers
->owner
);
3549 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3550 mdname(mddev
), clevel
);
3551 return PTR_ERR(priv
);
3554 /* Looks like we have a winner */
3555 mddev_suspend(mddev
);
3556 mddev
->pers
->stop(mddev
);
3558 if (mddev
->pers
->sync_request
== NULL
&&
3559 pers
->sync_request
!= NULL
) {
3560 /* need to add the md_redundancy_group */
3561 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3563 "md: cannot register extra attributes for %s\n",
3565 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3567 if (mddev
->pers
->sync_request
!= NULL
&&
3568 pers
->sync_request
== NULL
) {
3569 /* need to remove the md_redundancy_group */
3570 if (mddev
->to_remove
== NULL
)
3571 mddev
->to_remove
= &md_redundancy_group
;
3574 if (mddev
->pers
->sync_request
== NULL
&&
3576 /* We are converting from a no-redundancy array
3577 * to a redundancy array and metadata is managed
3578 * externally so we need to be sure that writes
3579 * won't block due to a need to transition
3581 * until external management is started.
3584 mddev
->safemode_delay
= 0;
3585 mddev
->safemode
= 0;
3588 rdev_for_each(rdev
, mddev
) {
3589 if (rdev
->raid_disk
< 0)
3591 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3592 rdev
->new_raid_disk
= -1;
3593 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3595 sysfs_unlink_rdev(mddev
, rdev
);
3597 rdev_for_each(rdev
, mddev
) {
3598 if (rdev
->raid_disk
< 0)
3600 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3602 rdev
->raid_disk
= rdev
->new_raid_disk
;
3603 if (rdev
->raid_disk
< 0)
3604 clear_bit(In_sync
, &rdev
->flags
);
3606 if (sysfs_link_rdev(mddev
, rdev
))
3607 printk(KERN_WARNING
"md: cannot register rd%d"
3608 " for %s after level change\n",
3609 rdev
->raid_disk
, mdname(mddev
));
3613 module_put(mddev
->pers
->owner
);
3615 mddev
->private = priv
;
3616 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3617 mddev
->level
= mddev
->new_level
;
3618 mddev
->layout
= mddev
->new_layout
;
3619 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3620 mddev
->delta_disks
= 0;
3621 mddev
->reshape_backwards
= 0;
3622 mddev
->degraded
= 0;
3623 if (mddev
->pers
->sync_request
== NULL
) {
3624 /* this is now an array without redundancy, so
3625 * it must always be in_sync
3628 del_timer_sync(&mddev
->safemode_timer
);
3630 blk_set_stacking_limits(&mddev
->queue
->limits
);
3632 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3633 mddev_resume(mddev
);
3634 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3635 md_new_event(mddev
);
3639 static struct md_sysfs_entry md_level
=
3640 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3644 layout_show(struct mddev
*mddev
, char *page
)
3646 /* just a number, not meaningful for all levels */
3647 if (mddev
->reshape_position
!= MaxSector
&&
3648 mddev
->layout
!= mddev
->new_layout
)
3649 return sprintf(page
, "%d (%d)\n",
3650 mddev
->new_layout
, mddev
->layout
);
3651 return sprintf(page
, "%d\n", mddev
->layout
);
3655 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3658 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3660 if (!*buf
|| (*e
&& *e
!= '\n'))
3665 if (mddev
->pers
->check_reshape
== NULL
)
3667 mddev
->new_layout
= n
;
3668 err
= mddev
->pers
->check_reshape(mddev
);
3670 mddev
->new_layout
= mddev
->layout
;
3674 mddev
->new_layout
= n
;
3675 if (mddev
->reshape_position
== MaxSector
)
3680 static struct md_sysfs_entry md_layout
=
3681 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3685 raid_disks_show(struct mddev
*mddev
, char *page
)
3687 if (mddev
->raid_disks
== 0)
3689 if (mddev
->reshape_position
!= MaxSector
&&
3690 mddev
->delta_disks
!= 0)
3691 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3692 mddev
->raid_disks
- mddev
->delta_disks
);
3693 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3696 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3699 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3703 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3705 if (!*buf
|| (*e
&& *e
!= '\n'))
3709 rv
= update_raid_disks(mddev
, n
);
3710 else if (mddev
->reshape_position
!= MaxSector
) {
3711 struct md_rdev
*rdev
;
3712 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3714 rdev_for_each(rdev
, mddev
) {
3716 rdev
->data_offset
< rdev
->new_data_offset
)
3719 rdev
->data_offset
> rdev
->new_data_offset
)
3722 mddev
->delta_disks
= n
- olddisks
;
3723 mddev
->raid_disks
= n
;
3724 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3726 mddev
->raid_disks
= n
;
3727 return rv
? rv
: len
;
3729 static struct md_sysfs_entry md_raid_disks
=
3730 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3733 chunk_size_show(struct mddev
*mddev
, char *page
)
3735 if (mddev
->reshape_position
!= MaxSector
&&
3736 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3737 return sprintf(page
, "%d (%d)\n",
3738 mddev
->new_chunk_sectors
<< 9,
3739 mddev
->chunk_sectors
<< 9);
3740 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3744 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3747 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3749 if (!*buf
|| (*e
&& *e
!= '\n'))
3754 if (mddev
->pers
->check_reshape
== NULL
)
3756 mddev
->new_chunk_sectors
= n
>> 9;
3757 err
= mddev
->pers
->check_reshape(mddev
);
3759 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3763 mddev
->new_chunk_sectors
= n
>> 9;
3764 if (mddev
->reshape_position
== MaxSector
)
3765 mddev
->chunk_sectors
= n
>> 9;
3769 static struct md_sysfs_entry md_chunk_size
=
3770 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3773 resync_start_show(struct mddev
*mddev
, char *page
)
3775 if (mddev
->recovery_cp
== MaxSector
)
3776 return sprintf(page
, "none\n");
3777 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3781 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3784 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3786 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3788 if (cmd_match(buf
, "none"))
3790 else if (!*buf
|| (*e
&& *e
!= '\n'))
3793 mddev
->recovery_cp
= n
;
3795 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3798 static struct md_sysfs_entry md_resync_start
=
3799 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3802 * The array state can be:
3805 * No devices, no size, no level
3806 * Equivalent to STOP_ARRAY ioctl
3808 * May have some settings, but array is not active
3809 * all IO results in error
3810 * When written, doesn't tear down array, but just stops it
3811 * suspended (not supported yet)
3812 * All IO requests will block. The array can be reconfigured.
3813 * Writing this, if accepted, will block until array is quiescent
3815 * no resync can happen. no superblocks get written.
3816 * write requests fail
3818 * like readonly, but behaves like 'clean' on a write request.
3820 * clean - no pending writes, but otherwise active.
3821 * When written to inactive array, starts without resync
3822 * If a write request arrives then
3823 * if metadata is known, mark 'dirty' and switch to 'active'.
3824 * if not known, block and switch to write-pending
3825 * If written to an active array that has pending writes, then fails.
3827 * fully active: IO and resync can be happening.
3828 * When written to inactive array, starts with resync
3831 * clean, but writes are blocked waiting for 'active' to be written.
3834 * like active, but no writes have been seen for a while (100msec).
3837 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3838 write_pending
, active_idle
, bad_word
};
3839 static char *array_states
[] = {
3840 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3841 "write-pending", "active-idle", NULL
};
3843 static int match_word(const char *word
, char **list
)
3846 for (n
=0; list
[n
]; n
++)
3847 if (cmd_match(word
, list
[n
]))
3853 array_state_show(struct mddev
*mddev
, char *page
)
3855 enum array_state st
= inactive
;
3868 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3870 else if (mddev
->safemode
)
3876 if (list_empty(&mddev
->disks
) &&
3877 mddev
->raid_disks
== 0 &&
3878 mddev
->dev_sectors
== 0)
3883 return sprintf(page
, "%s\n", array_states
[st
]);
3886 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3887 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3888 static int do_md_run(struct mddev
* mddev
);
3889 static int restart_array(struct mddev
*mddev
);
3892 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3895 enum array_state st
= match_word(buf
, array_states
);
3900 /* stopping an active array */
3901 err
= do_md_stop(mddev
, 0, NULL
);
3904 /* stopping an active array */
3906 err
= do_md_stop(mddev
, 2, NULL
);
3908 err
= 0; /* already inactive */
3911 break; /* not supported yet */
3914 err
= md_set_readonly(mddev
, NULL
);
3917 set_disk_ro(mddev
->gendisk
, 1);
3918 err
= do_md_run(mddev
);
3924 err
= md_set_readonly(mddev
, NULL
);
3925 else if (mddev
->ro
== 1)
3926 err
= restart_array(mddev
);
3929 set_disk_ro(mddev
->gendisk
, 0);
3933 err
= do_md_run(mddev
);
3938 restart_array(mddev
);
3939 spin_lock_irq(&mddev
->write_lock
);
3940 if (atomic_read(&mddev
->writes_pending
) == 0) {
3941 if (mddev
->in_sync
== 0) {
3943 if (mddev
->safemode
== 1)
3944 mddev
->safemode
= 0;
3945 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3950 spin_unlock_irq(&mddev
->write_lock
);
3956 restart_array(mddev
);
3957 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3958 wake_up(&mddev
->sb_wait
);
3962 set_disk_ro(mddev
->gendisk
, 0);
3963 err
= do_md_run(mddev
);
3968 /* these cannot be set */
3974 if (mddev
->hold_active
== UNTIL_IOCTL
)
3975 mddev
->hold_active
= 0;
3976 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3980 static struct md_sysfs_entry md_array_state
=
3981 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3984 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3985 return sprintf(page
, "%d\n",
3986 atomic_read(&mddev
->max_corr_read_errors
));
3990 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3993 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3995 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3996 atomic_set(&mddev
->max_corr_read_errors
, n
);
4002 static struct md_sysfs_entry max_corr_read_errors
=
4003 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4004 max_corrected_read_errors_store
);
4007 null_show(struct mddev
*mddev
, char *page
)
4013 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4015 /* buf must be %d:%d\n? giving major and minor numbers */
4016 /* The new device is added to the array.
4017 * If the array has a persistent superblock, we read the
4018 * superblock to initialise info and check validity.
4019 * Otherwise, only checking done is that in bind_rdev_to_array,
4020 * which mainly checks size.
4023 int major
= simple_strtoul(buf
, &e
, 10);
4026 struct md_rdev
*rdev
;
4029 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4031 minor
= simple_strtoul(e
+1, &e
, 10);
4032 if (*e
&& *e
!= '\n')
4034 dev
= MKDEV(major
, minor
);
4035 if (major
!= MAJOR(dev
) ||
4036 minor
!= MINOR(dev
))
4040 if (mddev
->persistent
) {
4041 rdev
= md_import_device(dev
, mddev
->major_version
,
4042 mddev
->minor_version
);
4043 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4044 struct md_rdev
*rdev0
4045 = list_entry(mddev
->disks
.next
,
4046 struct md_rdev
, same_set
);
4047 err
= super_types
[mddev
->major_version
]
4048 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4052 } else if (mddev
->external
)
4053 rdev
= md_import_device(dev
, -2, -1);
4055 rdev
= md_import_device(dev
, -1, -1);
4058 return PTR_ERR(rdev
);
4059 err
= bind_rdev_to_array(rdev
, mddev
);
4063 return err
? err
: len
;
4066 static struct md_sysfs_entry md_new_device
=
4067 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4070 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4073 unsigned long chunk
, end_chunk
;
4077 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4079 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4080 if (buf
== end
) break;
4081 if (*end
== '-') { /* range */
4083 end_chunk
= simple_strtoul(buf
, &end
, 0);
4084 if (buf
== end
) break;
4086 if (*end
&& !isspace(*end
)) break;
4087 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4088 buf
= skip_spaces(end
);
4090 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4095 static struct md_sysfs_entry md_bitmap
=
4096 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4099 size_show(struct mddev
*mddev
, char *page
)
4101 return sprintf(page
, "%llu\n",
4102 (unsigned long long)mddev
->dev_sectors
/ 2);
4105 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4108 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4110 /* If array is inactive, we can reduce the component size, but
4111 * not increase it (except from 0).
4112 * If array is active, we can try an on-line resize
4115 int err
= strict_blocks_to_sectors(buf
, §ors
);
4120 err
= update_size(mddev
, sectors
);
4121 md_update_sb(mddev
, 1);
4123 if (mddev
->dev_sectors
== 0 ||
4124 mddev
->dev_sectors
> sectors
)
4125 mddev
->dev_sectors
= sectors
;
4129 return err
? err
: len
;
4132 static struct md_sysfs_entry md_size
=
4133 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4136 /* Metadata version.
4138 * 'none' for arrays with no metadata (good luck...)
4139 * 'external' for arrays with externally managed metadata,
4140 * or N.M for internally known formats
4143 metadata_show(struct mddev
*mddev
, char *page
)
4145 if (mddev
->persistent
)
4146 return sprintf(page
, "%d.%d\n",
4147 mddev
->major_version
, mddev
->minor_version
);
4148 else if (mddev
->external
)
4149 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4151 return sprintf(page
, "none\n");
4155 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4159 /* Changing the details of 'external' metadata is
4160 * always permitted. Otherwise there must be
4161 * no devices attached to the array.
4163 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4165 else if (!list_empty(&mddev
->disks
))
4168 if (cmd_match(buf
, "none")) {
4169 mddev
->persistent
= 0;
4170 mddev
->external
= 0;
4171 mddev
->major_version
= 0;
4172 mddev
->minor_version
= 90;
4175 if (strncmp(buf
, "external:", 9) == 0) {
4176 size_t namelen
= len
-9;
4177 if (namelen
>= sizeof(mddev
->metadata_type
))
4178 namelen
= sizeof(mddev
->metadata_type
)-1;
4179 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4180 mddev
->metadata_type
[namelen
] = 0;
4181 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4182 mddev
->metadata_type
[--namelen
] = 0;
4183 mddev
->persistent
= 0;
4184 mddev
->external
= 1;
4185 mddev
->major_version
= 0;
4186 mddev
->minor_version
= 90;
4189 major
= simple_strtoul(buf
, &e
, 10);
4190 if (e
==buf
|| *e
!= '.')
4193 minor
= simple_strtoul(buf
, &e
, 10);
4194 if (e
==buf
|| (*e
&& *e
!= '\n') )
4196 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4198 mddev
->major_version
= major
;
4199 mddev
->minor_version
= minor
;
4200 mddev
->persistent
= 1;
4201 mddev
->external
= 0;
4205 static struct md_sysfs_entry md_metadata
=
4206 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4209 action_show(struct mddev
*mddev
, char *page
)
4211 char *type
= "idle";
4212 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4214 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4215 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4216 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4218 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4219 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4221 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4225 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4228 return sprintf(page
, "%s\n", type
);
4232 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4234 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4237 if (cmd_match(page
, "frozen"))
4238 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4240 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4242 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4243 if (mddev
->sync_thread
) {
4244 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4245 md_reap_sync_thread(mddev
);
4247 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4248 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4250 else if (cmd_match(page
, "resync"))
4251 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4252 else if (cmd_match(page
, "recover")) {
4253 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4254 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4255 } else if (cmd_match(page
, "reshape")) {
4257 if (mddev
->pers
->start_reshape
== NULL
)
4259 err
= mddev
->pers
->start_reshape(mddev
);
4262 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4264 if (cmd_match(page
, "check"))
4265 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4266 else if (!cmd_match(page
, "repair"))
4268 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4269 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4271 if (mddev
->ro
== 2) {
4272 /* A write to sync_action is enough to justify
4273 * canceling read-auto mode
4276 md_wakeup_thread(mddev
->sync_thread
);
4278 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4279 md_wakeup_thread(mddev
->thread
);
4280 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4285 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4287 return sprintf(page
, "%llu\n",
4288 (unsigned long long)
4289 atomic64_read(&mddev
->resync_mismatches
));
4292 static struct md_sysfs_entry md_scan_mode
=
4293 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4296 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4299 sync_min_show(struct mddev
*mddev
, char *page
)
4301 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4302 mddev
->sync_speed_min
? "local": "system");
4306 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4310 if (strncmp(buf
, "system", 6)==0) {
4311 mddev
->sync_speed_min
= 0;
4314 min
= simple_strtoul(buf
, &e
, 10);
4315 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4317 mddev
->sync_speed_min
= min
;
4321 static struct md_sysfs_entry md_sync_min
=
4322 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4325 sync_max_show(struct mddev
*mddev
, char *page
)
4327 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4328 mddev
->sync_speed_max
? "local": "system");
4332 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4336 if (strncmp(buf
, "system", 6)==0) {
4337 mddev
->sync_speed_max
= 0;
4340 max
= simple_strtoul(buf
, &e
, 10);
4341 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4343 mddev
->sync_speed_max
= max
;
4347 static struct md_sysfs_entry md_sync_max
=
4348 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4351 degraded_show(struct mddev
*mddev
, char *page
)
4353 return sprintf(page
, "%d\n", mddev
->degraded
);
4355 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4358 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4360 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4364 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4368 if (strict_strtol(buf
, 10, &n
))
4371 if (n
!= 0 && n
!= 1)
4374 mddev
->parallel_resync
= n
;
4376 if (mddev
->sync_thread
)
4377 wake_up(&resync_wait
);
4382 /* force parallel resync, even with shared block devices */
4383 static struct md_sysfs_entry md_sync_force_parallel
=
4384 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4385 sync_force_parallel_show
, sync_force_parallel_store
);
4388 sync_speed_show(struct mddev
*mddev
, char *page
)
4390 unsigned long resync
, dt
, db
;
4391 if (mddev
->curr_resync
== 0)
4392 return sprintf(page
, "none\n");
4393 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4394 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4396 db
= resync
- mddev
->resync_mark_cnt
;
4397 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4400 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4403 sync_completed_show(struct mddev
*mddev
, char *page
)
4405 unsigned long long max_sectors
, resync
;
4407 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4408 return sprintf(page
, "none\n");
4410 if (mddev
->curr_resync
== 1 ||
4411 mddev
->curr_resync
== 2)
4412 return sprintf(page
, "delayed\n");
4414 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4415 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4416 max_sectors
= mddev
->resync_max_sectors
;
4418 max_sectors
= mddev
->dev_sectors
;
4420 resync
= mddev
->curr_resync_completed
;
4421 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4424 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4427 min_sync_show(struct mddev
*mddev
, char *page
)
4429 return sprintf(page
, "%llu\n",
4430 (unsigned long long)mddev
->resync_min
);
4433 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4435 unsigned long long min
;
4436 if (strict_strtoull(buf
, 10, &min
))
4438 if (min
> mddev
->resync_max
)
4440 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4443 /* Must be a multiple of chunk_size */
4444 if (mddev
->chunk_sectors
) {
4445 sector_t temp
= min
;
4446 if (sector_div(temp
, mddev
->chunk_sectors
))
4449 mddev
->resync_min
= min
;
4454 static struct md_sysfs_entry md_min_sync
=
4455 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4458 max_sync_show(struct mddev
*mddev
, char *page
)
4460 if (mddev
->resync_max
== MaxSector
)
4461 return sprintf(page
, "max\n");
4463 return sprintf(page
, "%llu\n",
4464 (unsigned long long)mddev
->resync_max
);
4467 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4469 if (strncmp(buf
, "max", 3) == 0)
4470 mddev
->resync_max
= MaxSector
;
4472 unsigned long long max
;
4473 if (strict_strtoull(buf
, 10, &max
))
4475 if (max
< mddev
->resync_min
)
4477 if (max
< mddev
->resync_max
&&
4479 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4482 /* Must be a multiple of chunk_size */
4483 if (mddev
->chunk_sectors
) {
4484 sector_t temp
= max
;
4485 if (sector_div(temp
, mddev
->chunk_sectors
))
4488 mddev
->resync_max
= max
;
4490 wake_up(&mddev
->recovery_wait
);
4494 static struct md_sysfs_entry md_max_sync
=
4495 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4498 suspend_lo_show(struct mddev
*mddev
, char *page
)
4500 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4504 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4507 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4508 unsigned long long old
= mddev
->suspend_lo
;
4510 if (mddev
->pers
== NULL
||
4511 mddev
->pers
->quiesce
== NULL
)
4513 if (buf
== e
|| (*e
&& *e
!= '\n'))
4516 mddev
->suspend_lo
= new;
4518 /* Shrinking suspended region */
4519 mddev
->pers
->quiesce(mddev
, 2);
4521 /* Expanding suspended region - need to wait */
4522 mddev
->pers
->quiesce(mddev
, 1);
4523 mddev
->pers
->quiesce(mddev
, 0);
4527 static struct md_sysfs_entry md_suspend_lo
=
4528 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4532 suspend_hi_show(struct mddev
*mddev
, char *page
)
4534 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4538 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4541 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4542 unsigned long long old
= mddev
->suspend_hi
;
4544 if (mddev
->pers
== NULL
||
4545 mddev
->pers
->quiesce
== NULL
)
4547 if (buf
== e
|| (*e
&& *e
!= '\n'))
4550 mddev
->suspend_hi
= new;
4552 /* Shrinking suspended region */
4553 mddev
->pers
->quiesce(mddev
, 2);
4555 /* Expanding suspended region - need to wait */
4556 mddev
->pers
->quiesce(mddev
, 1);
4557 mddev
->pers
->quiesce(mddev
, 0);
4561 static struct md_sysfs_entry md_suspend_hi
=
4562 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4565 reshape_position_show(struct mddev
*mddev
, char *page
)
4567 if (mddev
->reshape_position
!= MaxSector
)
4568 return sprintf(page
, "%llu\n",
4569 (unsigned long long)mddev
->reshape_position
);
4570 strcpy(page
, "none\n");
4575 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4577 struct md_rdev
*rdev
;
4579 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4582 if (buf
== e
|| (*e
&& *e
!= '\n'))
4584 mddev
->reshape_position
= new;
4585 mddev
->delta_disks
= 0;
4586 mddev
->reshape_backwards
= 0;
4587 mddev
->new_level
= mddev
->level
;
4588 mddev
->new_layout
= mddev
->layout
;
4589 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4590 rdev_for_each(rdev
, mddev
)
4591 rdev
->new_data_offset
= rdev
->data_offset
;
4595 static struct md_sysfs_entry md_reshape_position
=
4596 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4597 reshape_position_store
);
4600 reshape_direction_show(struct mddev
*mddev
, char *page
)
4602 return sprintf(page
, "%s\n",
4603 mddev
->reshape_backwards
? "backwards" : "forwards");
4607 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4610 if (cmd_match(buf
, "forwards"))
4612 else if (cmd_match(buf
, "backwards"))
4616 if (mddev
->reshape_backwards
== backwards
)
4619 /* check if we are allowed to change */
4620 if (mddev
->delta_disks
)
4623 if (mddev
->persistent
&&
4624 mddev
->major_version
== 0)
4627 mddev
->reshape_backwards
= backwards
;
4631 static struct md_sysfs_entry md_reshape_direction
=
4632 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4633 reshape_direction_store
);
4636 array_size_show(struct mddev
*mddev
, char *page
)
4638 if (mddev
->external_size
)
4639 return sprintf(page
, "%llu\n",
4640 (unsigned long long)mddev
->array_sectors
/2);
4642 return sprintf(page
, "default\n");
4646 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4650 if (strncmp(buf
, "default", 7) == 0) {
4652 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4654 sectors
= mddev
->array_sectors
;
4656 mddev
->external_size
= 0;
4658 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4660 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4663 mddev
->external_size
= 1;
4666 mddev
->array_sectors
= sectors
;
4668 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4669 revalidate_disk(mddev
->gendisk
);
4674 static struct md_sysfs_entry md_array_size
=
4675 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4678 static struct attribute
*md_default_attrs
[] = {
4681 &md_raid_disks
.attr
,
4682 &md_chunk_size
.attr
,
4684 &md_resync_start
.attr
,
4686 &md_new_device
.attr
,
4687 &md_safe_delay
.attr
,
4688 &md_array_state
.attr
,
4689 &md_reshape_position
.attr
,
4690 &md_reshape_direction
.attr
,
4691 &md_array_size
.attr
,
4692 &max_corr_read_errors
.attr
,
4696 static struct attribute
*md_redundancy_attrs
[] = {
4698 &md_mismatches
.attr
,
4701 &md_sync_speed
.attr
,
4702 &md_sync_force_parallel
.attr
,
4703 &md_sync_completed
.attr
,
4706 &md_suspend_lo
.attr
,
4707 &md_suspend_hi
.attr
,
4712 static struct attribute_group md_redundancy_group
= {
4714 .attrs
= md_redundancy_attrs
,
4719 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4721 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4722 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4727 spin_lock(&all_mddevs_lock
);
4728 if (list_empty(&mddev
->all_mddevs
)) {
4729 spin_unlock(&all_mddevs_lock
);
4733 spin_unlock(&all_mddevs_lock
);
4735 rv
= mddev_lock(mddev
);
4737 rv
= entry
->show(mddev
, page
);
4738 mddev_unlock(mddev
);
4745 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4746 const char *page
, size_t length
)
4748 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4749 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4754 if (!capable(CAP_SYS_ADMIN
))
4756 spin_lock(&all_mddevs_lock
);
4757 if (list_empty(&mddev
->all_mddevs
)) {
4758 spin_unlock(&all_mddevs_lock
);
4762 spin_unlock(&all_mddevs_lock
);
4763 if (entry
->store
== new_dev_store
)
4764 flush_workqueue(md_misc_wq
);
4765 rv
= mddev_lock(mddev
);
4767 rv
= entry
->store(mddev
, page
, length
);
4768 mddev_unlock(mddev
);
4774 static void md_free(struct kobject
*ko
)
4776 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4778 if (mddev
->sysfs_state
)
4779 sysfs_put(mddev
->sysfs_state
);
4781 if (mddev
->gendisk
) {
4782 del_gendisk(mddev
->gendisk
);
4783 put_disk(mddev
->gendisk
);
4786 blk_cleanup_queue(mddev
->queue
);
4791 static const struct sysfs_ops md_sysfs_ops
= {
4792 .show
= md_attr_show
,
4793 .store
= md_attr_store
,
4795 static struct kobj_type md_ktype
= {
4797 .sysfs_ops
= &md_sysfs_ops
,
4798 .default_attrs
= md_default_attrs
,
4803 static void mddev_delayed_delete(struct work_struct
*ws
)
4805 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4807 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4808 kobject_del(&mddev
->kobj
);
4809 kobject_put(&mddev
->kobj
);
4812 static int md_alloc(dev_t dev
, char *name
)
4814 static DEFINE_MUTEX(disks_mutex
);
4815 struct mddev
*mddev
= mddev_find(dev
);
4816 struct gendisk
*disk
;
4825 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4826 shift
= partitioned
? MdpMinorShift
: 0;
4827 unit
= MINOR(mddev
->unit
) >> shift
;
4829 /* wait for any previous instance of this device to be
4830 * completely removed (mddev_delayed_delete).
4832 flush_workqueue(md_misc_wq
);
4834 mutex_lock(&disks_mutex
);
4840 /* Need to ensure that 'name' is not a duplicate.
4842 struct mddev
*mddev2
;
4843 spin_lock(&all_mddevs_lock
);
4845 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4846 if (mddev2
->gendisk
&&
4847 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4848 spin_unlock(&all_mddevs_lock
);
4851 spin_unlock(&all_mddevs_lock
);
4855 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4858 mddev
->queue
->queuedata
= mddev
;
4860 blk_queue_make_request(mddev
->queue
, md_make_request
);
4861 blk_set_stacking_limits(&mddev
->queue
->limits
);
4863 disk
= alloc_disk(1 << shift
);
4865 blk_cleanup_queue(mddev
->queue
);
4866 mddev
->queue
= NULL
;
4869 disk
->major
= MAJOR(mddev
->unit
);
4870 disk
->first_minor
= unit
<< shift
;
4872 strcpy(disk
->disk_name
, name
);
4873 else if (partitioned
)
4874 sprintf(disk
->disk_name
, "md_d%d", unit
);
4876 sprintf(disk
->disk_name
, "md%d", unit
);
4877 disk
->fops
= &md_fops
;
4878 disk
->private_data
= mddev
;
4879 disk
->queue
= mddev
->queue
;
4880 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4881 /* Allow extended partitions. This makes the
4882 * 'mdp' device redundant, but we can't really
4885 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4886 mddev
->gendisk
= disk
;
4887 /* As soon as we call add_disk(), another thread could get
4888 * through to md_open, so make sure it doesn't get too far
4890 mutex_lock(&mddev
->open_mutex
);
4893 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4894 &disk_to_dev(disk
)->kobj
, "%s", "md");
4896 /* This isn't possible, but as kobject_init_and_add is marked
4897 * __must_check, we must do something with the result
4899 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4903 if (mddev
->kobj
.sd
&&
4904 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4905 printk(KERN_DEBUG
"pointless warning\n");
4906 mutex_unlock(&mddev
->open_mutex
);
4908 mutex_unlock(&disks_mutex
);
4909 if (!error
&& mddev
->kobj
.sd
) {
4910 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4911 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4917 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4919 md_alloc(dev
, NULL
);
4923 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4925 /* val must be "md_*" where * is not all digits.
4926 * We allocate an array with a large free minor number, and
4927 * set the name to val. val must not already be an active name.
4929 int len
= strlen(val
);
4930 char buf
[DISK_NAME_LEN
];
4932 while (len
&& val
[len
-1] == '\n')
4934 if (len
>= DISK_NAME_LEN
)
4936 strlcpy(buf
, val
, len
+1);
4937 if (strncmp(buf
, "md_", 3) != 0)
4939 return md_alloc(0, buf
);
4942 static void md_safemode_timeout(unsigned long data
)
4944 struct mddev
*mddev
= (struct mddev
*) data
;
4946 if (!atomic_read(&mddev
->writes_pending
)) {
4947 mddev
->safemode
= 1;
4948 if (mddev
->external
)
4949 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4951 md_wakeup_thread(mddev
->thread
);
4954 static int start_dirty_degraded
;
4956 int md_run(struct mddev
*mddev
)
4959 struct md_rdev
*rdev
;
4960 struct md_personality
*pers
;
4962 if (list_empty(&mddev
->disks
))
4963 /* cannot run an array with no devices.. */
4968 /* Cannot run until previous stop completes properly */
4969 if (mddev
->sysfs_active
)
4973 * Analyze all RAID superblock(s)
4975 if (!mddev
->raid_disks
) {
4976 if (!mddev
->persistent
)
4981 if (mddev
->level
!= LEVEL_NONE
)
4982 request_module("md-level-%d", mddev
->level
);
4983 else if (mddev
->clevel
[0])
4984 request_module("md-%s", mddev
->clevel
);
4987 * Drop all container device buffers, from now on
4988 * the only valid external interface is through the md
4991 rdev_for_each(rdev
, mddev
) {
4992 if (test_bit(Faulty
, &rdev
->flags
))
4994 sync_blockdev(rdev
->bdev
);
4995 invalidate_bdev(rdev
->bdev
);
4997 /* perform some consistency tests on the device.
4998 * We don't want the data to overlap the metadata,
4999 * Internal Bitmap issues have been handled elsewhere.
5001 if (rdev
->meta_bdev
) {
5002 /* Nothing to check */;
5003 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5004 if (mddev
->dev_sectors
&&
5005 rdev
->data_offset
+ mddev
->dev_sectors
5007 printk("md: %s: data overlaps metadata\n",
5012 if (rdev
->sb_start
+ rdev
->sb_size
/512
5013 > rdev
->data_offset
) {
5014 printk("md: %s: metadata overlaps data\n",
5019 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5022 if (mddev
->bio_set
== NULL
)
5023 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5025 spin_lock(&pers_lock
);
5026 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5027 if (!pers
|| !try_module_get(pers
->owner
)) {
5028 spin_unlock(&pers_lock
);
5029 if (mddev
->level
!= LEVEL_NONE
)
5030 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5033 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5038 spin_unlock(&pers_lock
);
5039 if (mddev
->level
!= pers
->level
) {
5040 mddev
->level
= pers
->level
;
5041 mddev
->new_level
= pers
->level
;
5043 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5045 if (mddev
->reshape_position
!= MaxSector
&&
5046 pers
->start_reshape
== NULL
) {
5047 /* This personality cannot handle reshaping... */
5049 module_put(pers
->owner
);
5053 if (pers
->sync_request
) {
5054 /* Warn if this is a potentially silly
5057 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5058 struct md_rdev
*rdev2
;
5061 rdev_for_each(rdev
, mddev
)
5062 rdev_for_each(rdev2
, mddev
) {
5064 rdev
->bdev
->bd_contains
==
5065 rdev2
->bdev
->bd_contains
) {
5067 "%s: WARNING: %s appears to be"
5068 " on the same physical disk as"
5071 bdevname(rdev
->bdev
,b
),
5072 bdevname(rdev2
->bdev
,b2
));
5079 "True protection against single-disk"
5080 " failure might be compromised.\n");
5083 mddev
->recovery
= 0;
5084 /* may be over-ridden by personality */
5085 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5087 mddev
->ok_start_degraded
= start_dirty_degraded
;
5089 if (start_readonly
&& mddev
->ro
== 0)
5090 mddev
->ro
= 2; /* read-only, but switch on first write */
5092 err
= mddev
->pers
->run(mddev
);
5094 printk(KERN_ERR
"md: pers->run() failed ...\n");
5095 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5096 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5097 " but 'external_size' not in effect?\n", __func__
);
5099 "md: invalid array_size %llu > default size %llu\n",
5100 (unsigned long long)mddev
->array_sectors
/ 2,
5101 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5103 mddev
->pers
->stop(mddev
);
5105 if (err
== 0 && mddev
->pers
->sync_request
&&
5106 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5107 err
= bitmap_create(mddev
);
5109 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5110 mdname(mddev
), err
);
5111 mddev
->pers
->stop(mddev
);
5115 module_put(mddev
->pers
->owner
);
5117 bitmap_destroy(mddev
);
5120 if (mddev
->pers
->sync_request
) {
5121 if (mddev
->kobj
.sd
&&
5122 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5124 "md: cannot register extra attributes for %s\n",
5126 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5127 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5130 atomic_set(&mddev
->writes_pending
,0);
5131 atomic_set(&mddev
->max_corr_read_errors
,
5132 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5133 mddev
->safemode
= 0;
5134 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5135 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5136 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5140 rdev_for_each(rdev
, mddev
)
5141 if (rdev
->raid_disk
>= 0)
5142 if (sysfs_link_rdev(mddev
, rdev
))
5143 /* failure here is OK */;
5145 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5148 md_update_sb(mddev
, 0);
5150 md_new_event(mddev
);
5151 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5152 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5153 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5156 EXPORT_SYMBOL_GPL(md_run
);
5158 static int do_md_run(struct mddev
*mddev
)
5162 err
= md_run(mddev
);
5165 err
= bitmap_load(mddev
);
5167 bitmap_destroy(mddev
);
5171 md_wakeup_thread(mddev
->thread
);
5172 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5174 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5175 revalidate_disk(mddev
->gendisk
);
5177 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5182 static int restart_array(struct mddev
*mddev
)
5184 struct gendisk
*disk
= mddev
->gendisk
;
5186 /* Complain if it has no devices */
5187 if (list_empty(&mddev
->disks
))
5193 mddev
->safemode
= 0;
5195 set_disk_ro(disk
, 0);
5196 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5198 /* Kick recovery or resync if necessary */
5199 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5200 md_wakeup_thread(mddev
->thread
);
5201 md_wakeup_thread(mddev
->sync_thread
);
5202 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5206 /* similar to deny_write_access, but accounts for our holding a reference
5207 * to the file ourselves */
5208 static int deny_bitmap_write_access(struct file
* file
)
5210 struct inode
*inode
= file
->f_mapping
->host
;
5212 spin_lock(&inode
->i_lock
);
5213 if (atomic_read(&inode
->i_writecount
) > 1) {
5214 spin_unlock(&inode
->i_lock
);
5217 atomic_set(&inode
->i_writecount
, -1);
5218 spin_unlock(&inode
->i_lock
);
5223 void restore_bitmap_write_access(struct file
*file
)
5225 struct inode
*inode
= file
->f_mapping
->host
;
5227 spin_lock(&inode
->i_lock
);
5228 atomic_set(&inode
->i_writecount
, 1);
5229 spin_unlock(&inode
->i_lock
);
5232 static void md_clean(struct mddev
*mddev
)
5234 mddev
->array_sectors
= 0;
5235 mddev
->external_size
= 0;
5236 mddev
->dev_sectors
= 0;
5237 mddev
->raid_disks
= 0;
5238 mddev
->recovery_cp
= 0;
5239 mddev
->resync_min
= 0;
5240 mddev
->resync_max
= MaxSector
;
5241 mddev
->reshape_position
= MaxSector
;
5242 mddev
->external
= 0;
5243 mddev
->persistent
= 0;
5244 mddev
->level
= LEVEL_NONE
;
5245 mddev
->clevel
[0] = 0;
5248 mddev
->metadata_type
[0] = 0;
5249 mddev
->chunk_sectors
= 0;
5250 mddev
->ctime
= mddev
->utime
= 0;
5252 mddev
->max_disks
= 0;
5254 mddev
->can_decrease_events
= 0;
5255 mddev
->delta_disks
= 0;
5256 mddev
->reshape_backwards
= 0;
5257 mddev
->new_level
= LEVEL_NONE
;
5258 mddev
->new_layout
= 0;
5259 mddev
->new_chunk_sectors
= 0;
5260 mddev
->curr_resync
= 0;
5261 atomic64_set(&mddev
->resync_mismatches
, 0);
5262 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5263 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5264 mddev
->recovery
= 0;
5267 mddev
->degraded
= 0;
5268 mddev
->safemode
= 0;
5269 mddev
->merge_check_needed
= 0;
5270 mddev
->bitmap_info
.offset
= 0;
5271 mddev
->bitmap_info
.default_offset
= 0;
5272 mddev
->bitmap_info
.default_space
= 0;
5273 mddev
->bitmap_info
.chunksize
= 0;
5274 mddev
->bitmap_info
.daemon_sleep
= 0;
5275 mddev
->bitmap_info
.max_write_behind
= 0;
5278 static void __md_stop_writes(struct mddev
*mddev
)
5280 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5281 if (mddev
->sync_thread
) {
5282 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5283 md_reap_sync_thread(mddev
);
5286 del_timer_sync(&mddev
->safemode_timer
);
5288 bitmap_flush(mddev
);
5289 md_super_wait(mddev
);
5291 if (mddev
->ro
== 0 &&
5292 (!mddev
->in_sync
|| mddev
->flags
)) {
5293 /* mark array as shutdown cleanly */
5295 md_update_sb(mddev
, 1);
5299 void md_stop_writes(struct mddev
*mddev
)
5302 __md_stop_writes(mddev
);
5303 mddev_unlock(mddev
);
5305 EXPORT_SYMBOL_GPL(md_stop_writes
);
5307 static void __md_stop(struct mddev
*mddev
)
5310 /* Ensure ->event_work is done */
5311 flush_workqueue(md_misc_wq
);
5312 mddev
->pers
->stop(mddev
);
5313 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5314 mddev
->to_remove
= &md_redundancy_group
;
5315 module_put(mddev
->pers
->owner
);
5317 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5320 void md_stop(struct mddev
*mddev
)
5322 /* stop the array and free an attached data structures.
5323 * This is called from dm-raid
5326 bitmap_destroy(mddev
);
5328 bioset_free(mddev
->bio_set
);
5331 EXPORT_SYMBOL_GPL(md_stop
);
5333 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5336 mutex_lock(&mddev
->open_mutex
);
5337 if (atomic_read(&mddev
->openers
) > !!bdev
) {
5338 printk("md: %s still in use.\n",mdname(mddev
));
5343 sync_blockdev(bdev
);
5345 __md_stop_writes(mddev
);
5351 set_disk_ro(mddev
->gendisk
, 1);
5352 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5353 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5357 mutex_unlock(&mddev
->open_mutex
);
5362 * 0 - completely stop and dis-assemble array
5363 * 2 - stop but do not disassemble array
5365 static int do_md_stop(struct mddev
* mddev
, int mode
,
5366 struct block_device
*bdev
)
5368 struct gendisk
*disk
= mddev
->gendisk
;
5369 struct md_rdev
*rdev
;
5371 mutex_lock(&mddev
->open_mutex
);
5372 if (atomic_read(&mddev
->openers
) > !!bdev
||
5373 mddev
->sysfs_active
) {
5374 printk("md: %s still in use.\n",mdname(mddev
));
5375 mutex_unlock(&mddev
->open_mutex
);
5379 /* It is possible IO was issued on some other
5380 * open file which was closed before we took ->open_mutex.
5381 * As that was not the last close __blkdev_put will not
5382 * have called sync_blockdev, so we must.
5384 sync_blockdev(bdev
);
5388 set_disk_ro(disk
, 0);
5390 __md_stop_writes(mddev
);
5392 mddev
->queue
->merge_bvec_fn
= NULL
;
5393 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5395 /* tell userspace to handle 'inactive' */
5396 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5398 rdev_for_each(rdev
, mddev
)
5399 if (rdev
->raid_disk
>= 0)
5400 sysfs_unlink_rdev(mddev
, rdev
);
5402 set_capacity(disk
, 0);
5403 mutex_unlock(&mddev
->open_mutex
);
5405 revalidate_disk(disk
);
5410 mutex_unlock(&mddev
->open_mutex
);
5412 * Free resources if final stop
5415 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5417 bitmap_destroy(mddev
);
5418 if (mddev
->bitmap_info
.file
) {
5419 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5420 fput(mddev
->bitmap_info
.file
);
5421 mddev
->bitmap_info
.file
= NULL
;
5423 mddev
->bitmap_info
.offset
= 0;
5425 export_array(mddev
);
5428 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5429 if (mddev
->hold_active
== UNTIL_STOP
)
5430 mddev
->hold_active
= 0;
5432 blk_integrity_unregister(disk
);
5433 md_new_event(mddev
);
5434 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5439 static void autorun_array(struct mddev
*mddev
)
5441 struct md_rdev
*rdev
;
5444 if (list_empty(&mddev
->disks
))
5447 printk(KERN_INFO
"md: running: ");
5449 rdev_for_each(rdev
, mddev
) {
5450 char b
[BDEVNAME_SIZE
];
5451 printk("<%s>", bdevname(rdev
->bdev
,b
));
5455 err
= do_md_run(mddev
);
5457 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5458 do_md_stop(mddev
, 0, NULL
);
5463 * lets try to run arrays based on all disks that have arrived
5464 * until now. (those are in pending_raid_disks)
5466 * the method: pick the first pending disk, collect all disks with
5467 * the same UUID, remove all from the pending list and put them into
5468 * the 'same_array' list. Then order this list based on superblock
5469 * update time (freshest comes first), kick out 'old' disks and
5470 * compare superblocks. If everything's fine then run it.
5472 * If "unit" is allocated, then bump its reference count
5474 static void autorun_devices(int part
)
5476 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5477 struct mddev
*mddev
;
5478 char b
[BDEVNAME_SIZE
];
5480 printk(KERN_INFO
"md: autorun ...\n");
5481 while (!list_empty(&pending_raid_disks
)) {
5484 LIST_HEAD(candidates
);
5485 rdev0
= list_entry(pending_raid_disks
.next
,
5486 struct md_rdev
, same_set
);
5488 printk(KERN_INFO
"md: considering %s ...\n",
5489 bdevname(rdev0
->bdev
,b
));
5490 INIT_LIST_HEAD(&candidates
);
5491 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5492 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5493 printk(KERN_INFO
"md: adding %s ...\n",
5494 bdevname(rdev
->bdev
,b
));
5495 list_move(&rdev
->same_set
, &candidates
);
5498 * now we have a set of devices, with all of them having
5499 * mostly sane superblocks. It's time to allocate the
5503 dev
= MKDEV(mdp_major
,
5504 rdev0
->preferred_minor
<< MdpMinorShift
);
5505 unit
= MINOR(dev
) >> MdpMinorShift
;
5507 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5510 if (rdev0
->preferred_minor
!= unit
) {
5511 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5512 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5516 md_probe(dev
, NULL
, NULL
);
5517 mddev
= mddev_find(dev
);
5518 if (!mddev
|| !mddev
->gendisk
) {
5522 "md: cannot allocate memory for md drive.\n");
5525 if (mddev_lock(mddev
))
5526 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5528 else if (mddev
->raid_disks
|| mddev
->major_version
5529 || !list_empty(&mddev
->disks
)) {
5531 "md: %s already running, cannot run %s\n",
5532 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5533 mddev_unlock(mddev
);
5535 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5536 mddev
->persistent
= 1;
5537 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5538 list_del_init(&rdev
->same_set
);
5539 if (bind_rdev_to_array(rdev
, mddev
))
5542 autorun_array(mddev
);
5543 mddev_unlock(mddev
);
5545 /* on success, candidates will be empty, on error
5548 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5549 list_del_init(&rdev
->same_set
);
5554 printk(KERN_INFO
"md: ... autorun DONE.\n");
5556 #endif /* !MODULE */
5558 static int get_version(void __user
* arg
)
5562 ver
.major
= MD_MAJOR_VERSION
;
5563 ver
.minor
= MD_MINOR_VERSION
;
5564 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5566 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5572 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5574 mdu_array_info_t info
;
5575 int nr
,working
,insync
,failed
,spare
;
5576 struct md_rdev
*rdev
;
5578 nr
= working
= insync
= failed
= spare
= 0;
5580 rdev_for_each_rcu(rdev
, mddev
) {
5582 if (test_bit(Faulty
, &rdev
->flags
))
5586 if (test_bit(In_sync
, &rdev
->flags
))
5594 info
.major_version
= mddev
->major_version
;
5595 info
.minor_version
= mddev
->minor_version
;
5596 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5597 info
.ctime
= mddev
->ctime
;
5598 info
.level
= mddev
->level
;
5599 info
.size
= mddev
->dev_sectors
/ 2;
5600 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5603 info
.raid_disks
= mddev
->raid_disks
;
5604 info
.md_minor
= mddev
->md_minor
;
5605 info
.not_persistent
= !mddev
->persistent
;
5607 info
.utime
= mddev
->utime
;
5610 info
.state
= (1<<MD_SB_CLEAN
);
5611 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5612 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5613 info
.active_disks
= insync
;
5614 info
.working_disks
= working
;
5615 info
.failed_disks
= failed
;
5616 info
.spare_disks
= spare
;
5618 info
.layout
= mddev
->layout
;
5619 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5621 if (copy_to_user(arg
, &info
, sizeof(info
)))
5627 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5629 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5630 char *ptr
, *buf
= NULL
;
5633 if (md_allow_write(mddev
))
5634 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5636 file
= kzalloc(sizeof(*file
), GFP_KERNEL
);
5641 /* bitmap disabled, zero the first byte and copy out */
5642 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5643 file
->pathname
[0] = '\0';
5647 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5651 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5652 buf
, sizeof(file
->pathname
));
5656 strcpy(file
->pathname
, ptr
);
5660 if (copy_to_user(arg
, file
, sizeof(*file
)))
5668 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5670 mdu_disk_info_t info
;
5671 struct md_rdev
*rdev
;
5673 if (copy_from_user(&info
, arg
, sizeof(info
)))
5677 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5679 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5680 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5681 info
.raid_disk
= rdev
->raid_disk
;
5683 if (test_bit(Faulty
, &rdev
->flags
))
5684 info
.state
|= (1<<MD_DISK_FAULTY
);
5685 else if (test_bit(In_sync
, &rdev
->flags
)) {
5686 info
.state
|= (1<<MD_DISK_ACTIVE
);
5687 info
.state
|= (1<<MD_DISK_SYNC
);
5689 if (test_bit(WriteMostly
, &rdev
->flags
))
5690 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5692 info
.major
= info
.minor
= 0;
5693 info
.raid_disk
= -1;
5694 info
.state
= (1<<MD_DISK_REMOVED
);
5698 if (copy_to_user(arg
, &info
, sizeof(info
)))
5704 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5706 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5707 struct md_rdev
*rdev
;
5708 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5710 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5713 if (!mddev
->raid_disks
) {
5715 /* expecting a device which has a superblock */
5716 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5719 "md: md_import_device returned %ld\n",
5721 return PTR_ERR(rdev
);
5723 if (!list_empty(&mddev
->disks
)) {
5724 struct md_rdev
*rdev0
5725 = list_entry(mddev
->disks
.next
,
5726 struct md_rdev
, same_set
);
5727 err
= super_types
[mddev
->major_version
]
5728 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5731 "md: %s has different UUID to %s\n",
5732 bdevname(rdev
->bdev
,b
),
5733 bdevname(rdev0
->bdev
,b2
));
5738 err
= bind_rdev_to_array(rdev
, mddev
);
5745 * add_new_disk can be used once the array is assembled
5746 * to add "hot spares". They must already have a superblock
5751 if (!mddev
->pers
->hot_add_disk
) {
5753 "%s: personality does not support diskops!\n",
5757 if (mddev
->persistent
)
5758 rdev
= md_import_device(dev
, mddev
->major_version
,
5759 mddev
->minor_version
);
5761 rdev
= md_import_device(dev
, -1, -1);
5764 "md: md_import_device returned %ld\n",
5766 return PTR_ERR(rdev
);
5768 /* set saved_raid_disk if appropriate */
5769 if (!mddev
->persistent
) {
5770 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5771 info
->raid_disk
< mddev
->raid_disks
) {
5772 rdev
->raid_disk
= info
->raid_disk
;
5773 set_bit(In_sync
, &rdev
->flags
);
5774 clear_bit(Bitmap_sync
, &rdev
->flags
);
5776 rdev
->raid_disk
= -1;
5778 super_types
[mddev
->major_version
].
5779 validate_super(mddev
, rdev
);
5780 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5781 rdev
->raid_disk
!= info
->raid_disk
) {
5782 /* This was a hot-add request, but events doesn't
5783 * match, so reject it.
5789 if (test_bit(In_sync
, &rdev
->flags
))
5790 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5792 rdev
->saved_raid_disk
= -1;
5794 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5795 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5796 set_bit(WriteMostly
, &rdev
->flags
);
5798 clear_bit(WriteMostly
, &rdev
->flags
);
5800 rdev
->raid_disk
= -1;
5801 err
= bind_rdev_to_array(rdev
, mddev
);
5802 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5803 /* If there is hot_add_disk but no hot_remove_disk
5804 * then added disks for geometry changes,
5805 * and should be added immediately.
5807 super_types
[mddev
->major_version
].
5808 validate_super(mddev
, rdev
);
5809 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5811 unbind_rdev_from_array(rdev
);
5816 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5818 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5819 if (mddev
->degraded
)
5820 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5821 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5823 md_new_event(mddev
);
5824 md_wakeup_thread(mddev
->thread
);
5828 /* otherwise, add_new_disk is only allowed
5829 * for major_version==0 superblocks
5831 if (mddev
->major_version
!= 0) {
5832 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5837 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5839 rdev
= md_import_device(dev
, -1, 0);
5842 "md: error, md_import_device() returned %ld\n",
5844 return PTR_ERR(rdev
);
5846 rdev
->desc_nr
= info
->number
;
5847 if (info
->raid_disk
< mddev
->raid_disks
)
5848 rdev
->raid_disk
= info
->raid_disk
;
5850 rdev
->raid_disk
= -1;
5852 if (rdev
->raid_disk
< mddev
->raid_disks
)
5853 if (info
->state
& (1<<MD_DISK_SYNC
))
5854 set_bit(In_sync
, &rdev
->flags
);
5856 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5857 set_bit(WriteMostly
, &rdev
->flags
);
5859 if (!mddev
->persistent
) {
5860 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5861 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5863 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5864 rdev
->sectors
= rdev
->sb_start
;
5866 err
= bind_rdev_to_array(rdev
, mddev
);
5876 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5878 char b
[BDEVNAME_SIZE
];
5879 struct md_rdev
*rdev
;
5881 rdev
= find_rdev(mddev
, dev
);
5885 clear_bit(Blocked
, &rdev
->flags
);
5886 remove_and_add_spares(mddev
, rdev
);
5888 if (rdev
->raid_disk
>= 0)
5891 kick_rdev_from_array(rdev
);
5892 md_update_sb(mddev
, 1);
5893 md_new_event(mddev
);
5897 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5898 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5902 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5904 char b
[BDEVNAME_SIZE
];
5906 struct md_rdev
*rdev
;
5911 if (mddev
->major_version
!= 0) {
5912 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5913 " version-0 superblocks.\n",
5917 if (!mddev
->pers
->hot_add_disk
) {
5919 "%s: personality does not support diskops!\n",
5924 rdev
= md_import_device(dev
, -1, 0);
5927 "md: error, md_import_device() returned %ld\n",
5932 if (mddev
->persistent
)
5933 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5935 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5937 rdev
->sectors
= rdev
->sb_start
;
5939 if (test_bit(Faulty
, &rdev
->flags
)) {
5941 "md: can not hot-add faulty %s disk to %s!\n",
5942 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5946 clear_bit(In_sync
, &rdev
->flags
);
5948 rdev
->saved_raid_disk
= -1;
5949 err
= bind_rdev_to_array(rdev
, mddev
);
5954 * The rest should better be atomic, we can have disk failures
5955 * noticed in interrupt contexts ...
5958 rdev
->raid_disk
= -1;
5960 md_update_sb(mddev
, 1);
5963 * Kick recovery, maybe this spare has to be added to the
5964 * array immediately.
5966 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5967 md_wakeup_thread(mddev
->thread
);
5968 md_new_event(mddev
);
5976 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5981 if (!mddev
->pers
->quiesce
)
5983 if (mddev
->recovery
|| mddev
->sync_thread
)
5985 /* we should be able to change the bitmap.. */
5991 return -EEXIST
; /* cannot add when bitmap is present */
5992 mddev
->bitmap_info
.file
= fget(fd
);
5994 if (mddev
->bitmap_info
.file
== NULL
) {
5995 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6000 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
6002 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6004 fput(mddev
->bitmap_info
.file
);
6005 mddev
->bitmap_info
.file
= NULL
;
6008 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6009 } else if (mddev
->bitmap
== NULL
)
6010 return -ENOENT
; /* cannot remove what isn't there */
6013 mddev
->pers
->quiesce(mddev
, 1);
6015 err
= bitmap_create(mddev
);
6017 err
= bitmap_load(mddev
);
6019 if (fd
< 0 || err
) {
6020 bitmap_destroy(mddev
);
6021 fd
= -1; /* make sure to put the file */
6023 mddev
->pers
->quiesce(mddev
, 0);
6026 if (mddev
->bitmap_info
.file
) {
6027 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6028 fput(mddev
->bitmap_info
.file
);
6030 mddev
->bitmap_info
.file
= NULL
;
6037 * set_array_info is used two different ways
6038 * The original usage is when creating a new array.
6039 * In this usage, raid_disks is > 0 and it together with
6040 * level, size, not_persistent,layout,chunksize determine the
6041 * shape of the array.
6042 * This will always create an array with a type-0.90.0 superblock.
6043 * The newer usage is when assembling an array.
6044 * In this case raid_disks will be 0, and the major_version field is
6045 * use to determine which style super-blocks are to be found on the devices.
6046 * The minor and patch _version numbers are also kept incase the
6047 * super_block handler wishes to interpret them.
6049 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6052 if (info
->raid_disks
== 0) {
6053 /* just setting version number for superblock loading */
6054 if (info
->major_version
< 0 ||
6055 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6056 super_types
[info
->major_version
].name
== NULL
) {
6057 /* maybe try to auto-load a module? */
6059 "md: superblock version %d not known\n",
6060 info
->major_version
);
6063 mddev
->major_version
= info
->major_version
;
6064 mddev
->minor_version
= info
->minor_version
;
6065 mddev
->patch_version
= info
->patch_version
;
6066 mddev
->persistent
= !info
->not_persistent
;
6067 /* ensure mddev_put doesn't delete this now that there
6068 * is some minimal configuration.
6070 mddev
->ctime
= get_seconds();
6073 mddev
->major_version
= MD_MAJOR_VERSION
;
6074 mddev
->minor_version
= MD_MINOR_VERSION
;
6075 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6076 mddev
->ctime
= get_seconds();
6078 mddev
->level
= info
->level
;
6079 mddev
->clevel
[0] = 0;
6080 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6081 mddev
->raid_disks
= info
->raid_disks
;
6082 /* don't set md_minor, it is determined by which /dev/md* was
6085 if (info
->state
& (1<<MD_SB_CLEAN
))
6086 mddev
->recovery_cp
= MaxSector
;
6088 mddev
->recovery_cp
= 0;
6089 mddev
->persistent
= ! info
->not_persistent
;
6090 mddev
->external
= 0;
6092 mddev
->layout
= info
->layout
;
6093 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6095 mddev
->max_disks
= MD_SB_DISKS
;
6097 if (mddev
->persistent
)
6099 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6101 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6102 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6103 mddev
->bitmap_info
.offset
= 0;
6105 mddev
->reshape_position
= MaxSector
;
6108 * Generate a 128 bit UUID
6110 get_random_bytes(mddev
->uuid
, 16);
6112 mddev
->new_level
= mddev
->level
;
6113 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6114 mddev
->new_layout
= mddev
->layout
;
6115 mddev
->delta_disks
= 0;
6116 mddev
->reshape_backwards
= 0;
6121 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6123 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6125 if (mddev
->external_size
)
6128 mddev
->array_sectors
= array_sectors
;
6130 EXPORT_SYMBOL(md_set_array_sectors
);
6132 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6134 struct md_rdev
*rdev
;
6136 int fit
= (num_sectors
== 0);
6138 if (mddev
->pers
->resize
== NULL
)
6140 /* The "num_sectors" is the number of sectors of each device that
6141 * is used. This can only make sense for arrays with redundancy.
6142 * linear and raid0 always use whatever space is available. We can only
6143 * consider changing this number if no resync or reconstruction is
6144 * happening, and if the new size is acceptable. It must fit before the
6145 * sb_start or, if that is <data_offset, it must fit before the size
6146 * of each device. If num_sectors is zero, we find the largest size
6149 if (mddev
->sync_thread
)
6152 rdev_for_each(rdev
, mddev
) {
6153 sector_t avail
= rdev
->sectors
;
6155 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6156 num_sectors
= avail
;
6157 if (avail
< num_sectors
)
6160 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6162 revalidate_disk(mddev
->gendisk
);
6166 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6169 struct md_rdev
*rdev
;
6170 /* change the number of raid disks */
6171 if (mddev
->pers
->check_reshape
== NULL
)
6173 if (raid_disks
<= 0 ||
6174 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6176 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6179 rdev_for_each(rdev
, mddev
) {
6180 if (mddev
->raid_disks
< raid_disks
&&
6181 rdev
->data_offset
< rdev
->new_data_offset
)
6183 if (mddev
->raid_disks
> raid_disks
&&
6184 rdev
->data_offset
> rdev
->new_data_offset
)
6188 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6189 if (mddev
->delta_disks
< 0)
6190 mddev
->reshape_backwards
= 1;
6191 else if (mddev
->delta_disks
> 0)
6192 mddev
->reshape_backwards
= 0;
6194 rv
= mddev
->pers
->check_reshape(mddev
);
6196 mddev
->delta_disks
= 0;
6197 mddev
->reshape_backwards
= 0;
6204 * update_array_info is used to change the configuration of an
6206 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6207 * fields in the info are checked against the array.
6208 * Any differences that cannot be handled will cause an error.
6209 * Normally, only one change can be managed at a time.
6211 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6217 /* calculate expected state,ignoring low bits */
6218 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6219 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6221 if (mddev
->major_version
!= info
->major_version
||
6222 mddev
->minor_version
!= info
->minor_version
||
6223 /* mddev->patch_version != info->patch_version || */
6224 mddev
->ctime
!= info
->ctime
||
6225 mddev
->level
!= info
->level
||
6226 /* mddev->layout != info->layout || */
6227 mddev
->persistent
!= !info
->not_persistent
||
6228 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6229 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6230 ((state
^info
->state
) & 0xfffffe00)
6233 /* Check there is only one change */
6234 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6236 if (mddev
->raid_disks
!= info
->raid_disks
)
6238 if (mddev
->layout
!= info
->layout
)
6240 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6247 if (mddev
->layout
!= info
->layout
) {
6249 * we don't need to do anything at the md level, the
6250 * personality will take care of it all.
6252 if (mddev
->pers
->check_reshape
== NULL
)
6255 mddev
->new_layout
= info
->layout
;
6256 rv
= mddev
->pers
->check_reshape(mddev
);
6258 mddev
->new_layout
= mddev
->layout
;
6262 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6263 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6265 if (mddev
->raid_disks
!= info
->raid_disks
)
6266 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6268 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6269 if (mddev
->pers
->quiesce
== NULL
)
6271 if (mddev
->recovery
|| mddev
->sync_thread
)
6273 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6274 /* add the bitmap */
6277 if (mddev
->bitmap_info
.default_offset
== 0)
6279 mddev
->bitmap_info
.offset
=
6280 mddev
->bitmap_info
.default_offset
;
6281 mddev
->bitmap_info
.space
=
6282 mddev
->bitmap_info
.default_space
;
6283 mddev
->pers
->quiesce(mddev
, 1);
6284 rv
= bitmap_create(mddev
);
6286 rv
= bitmap_load(mddev
);
6288 bitmap_destroy(mddev
);
6289 mddev
->pers
->quiesce(mddev
, 0);
6291 /* remove the bitmap */
6294 if (mddev
->bitmap
->storage
.file
)
6296 mddev
->pers
->quiesce(mddev
, 1);
6297 bitmap_destroy(mddev
);
6298 mddev
->pers
->quiesce(mddev
, 0);
6299 mddev
->bitmap_info
.offset
= 0;
6302 md_update_sb(mddev
, 1);
6306 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6308 struct md_rdev
*rdev
;
6311 if (mddev
->pers
== NULL
)
6315 rdev
= find_rdev_rcu(mddev
, dev
);
6319 md_error(mddev
, rdev
);
6320 if (!test_bit(Faulty
, &rdev
->flags
))
6328 * We have a problem here : there is no easy way to give a CHS
6329 * virtual geometry. We currently pretend that we have a 2 heads
6330 * 4 sectors (with a BIG number of cylinders...). This drives
6331 * dosfs just mad... ;-)
6333 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6335 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6339 geo
->cylinders
= mddev
->array_sectors
/ 8;
6343 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6344 unsigned int cmd
, unsigned long arg
)
6347 void __user
*argp
= (void __user
*)arg
;
6348 struct mddev
*mddev
= NULL
;
6353 case GET_ARRAY_INFO
:
6357 if (!capable(CAP_SYS_ADMIN
))
6362 * Commands dealing with the RAID driver but not any
6367 err
= get_version(argp
);
6370 case PRINT_RAID_DEBUG
:
6378 autostart_arrays(arg
);
6385 * Commands creating/starting a new array:
6388 mddev
= bdev
->bd_disk
->private_data
;
6395 /* Some actions do not requires the mutex */
6397 case GET_ARRAY_INFO
:
6398 if (!mddev
->raid_disks
&& !mddev
->external
)
6401 err
= get_array_info(mddev
, argp
);
6405 if (!mddev
->raid_disks
&& !mddev
->external
)
6408 err
= get_disk_info(mddev
, argp
);
6411 case SET_DISK_FAULTY
:
6412 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6416 if (cmd
== ADD_NEW_DISK
)
6417 /* need to ensure md_delayed_delete() has completed */
6418 flush_workqueue(md_misc_wq
);
6420 err
= mddev_lock(mddev
);
6423 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6428 if (cmd
== SET_ARRAY_INFO
) {
6429 mdu_array_info_t info
;
6431 memset(&info
, 0, sizeof(info
));
6432 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6437 err
= update_array_info(mddev
, &info
);
6439 printk(KERN_WARNING
"md: couldn't update"
6440 " array info. %d\n", err
);
6445 if (!list_empty(&mddev
->disks
)) {
6447 "md: array %s already has disks!\n",
6452 if (mddev
->raid_disks
) {
6454 "md: array %s already initialised!\n",
6459 err
= set_array_info(mddev
, &info
);
6461 printk(KERN_WARNING
"md: couldn't set"
6462 " array info. %d\n", err
);
6469 * Commands querying/configuring an existing array:
6471 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6472 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6473 if ((!mddev
->raid_disks
&& !mddev
->external
)
6474 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6475 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6476 && cmd
!= GET_BITMAP_FILE
) {
6482 * Commands even a read-only array can execute:
6485 case GET_BITMAP_FILE
:
6486 err
= get_bitmap_file(mddev
, argp
);
6489 case RESTART_ARRAY_RW
:
6490 err
= restart_array(mddev
);
6494 err
= do_md_stop(mddev
, 0, bdev
);
6498 err
= md_set_readonly(mddev
, bdev
);
6501 case HOT_REMOVE_DISK
:
6502 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6506 /* We can support ADD_NEW_DISK on read-only arrays
6507 * on if we are re-adding a preexisting device.
6508 * So require mddev->pers and MD_DISK_SYNC.
6511 mdu_disk_info_t info
;
6512 if (copy_from_user(&info
, argp
, sizeof(info
)))
6514 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6515 /* Need to clear read-only for this */
6518 err
= add_new_disk(mddev
, &info
);
6524 if (get_user(ro
, (int __user
*)(arg
))) {
6530 /* if the bdev is going readonly the value of mddev->ro
6531 * does not matter, no writes are coming
6536 /* are we are already prepared for writes? */
6540 /* transitioning to readauto need only happen for
6541 * arrays that call md_write_start
6544 err
= restart_array(mddev
);
6547 set_disk_ro(mddev
->gendisk
, 0);
6554 * The remaining ioctls are changing the state of the
6555 * superblock, so we do not allow them on read-only arrays.
6556 * However non-MD ioctls (e.g. get-size) will still come through
6557 * here and hit the 'default' below, so only disallow
6558 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6560 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6561 if (mddev
->ro
== 2) {
6563 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6564 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6565 /* mddev_unlock will wake thread */
6566 /* If a device failed while we were read-only, we
6567 * need to make sure the metadata is updated now.
6569 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6570 mddev_unlock(mddev
);
6571 wait_event(mddev
->sb_wait
,
6572 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6573 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6585 mdu_disk_info_t info
;
6586 if (copy_from_user(&info
, argp
, sizeof(info
)))
6589 err
= add_new_disk(mddev
, &info
);
6594 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6598 err
= do_md_run(mddev
);
6601 case SET_BITMAP_FILE
:
6602 err
= set_bitmap_file(mddev
, (int)arg
);
6612 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6614 mddev
->hold_active
= 0;
6615 mddev_unlock(mddev
);
6624 #ifdef CONFIG_COMPAT
6625 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6626 unsigned int cmd
, unsigned long arg
)
6629 case HOT_REMOVE_DISK
:
6631 case SET_DISK_FAULTY
:
6632 case SET_BITMAP_FILE
:
6633 /* These take in integer arg, do not convert */
6636 arg
= (unsigned long)compat_ptr(arg
);
6640 return md_ioctl(bdev
, mode
, cmd
, arg
);
6642 #endif /* CONFIG_COMPAT */
6644 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6647 * Succeed if we can lock the mddev, which confirms that
6648 * it isn't being stopped right now.
6650 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6656 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6657 /* we are racing with mddev_put which is discarding this
6661 /* Wait until bdev->bd_disk is definitely gone */
6662 flush_workqueue(md_misc_wq
);
6663 /* Then retry the open from the top */
6664 return -ERESTARTSYS
;
6666 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6668 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6672 atomic_inc(&mddev
->openers
);
6673 mutex_unlock(&mddev
->open_mutex
);
6675 check_disk_change(bdev
);
6680 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6682 struct mddev
*mddev
= disk
->private_data
;
6685 atomic_dec(&mddev
->openers
);
6689 static int md_media_changed(struct gendisk
*disk
)
6691 struct mddev
*mddev
= disk
->private_data
;
6693 return mddev
->changed
;
6696 static int md_revalidate(struct gendisk
*disk
)
6698 struct mddev
*mddev
= disk
->private_data
;
6703 static const struct block_device_operations md_fops
=
6705 .owner
= THIS_MODULE
,
6707 .release
= md_release
,
6709 #ifdef CONFIG_COMPAT
6710 .compat_ioctl
= md_compat_ioctl
,
6712 .getgeo
= md_getgeo
,
6713 .media_changed
= md_media_changed
,
6714 .revalidate_disk
= md_revalidate
,
6717 static int md_thread(void * arg
)
6719 struct md_thread
*thread
= arg
;
6722 * md_thread is a 'system-thread', it's priority should be very
6723 * high. We avoid resource deadlocks individually in each
6724 * raid personality. (RAID5 does preallocation) We also use RR and
6725 * the very same RT priority as kswapd, thus we will never get
6726 * into a priority inversion deadlock.
6728 * we definitely have to have equal or higher priority than
6729 * bdflush, otherwise bdflush will deadlock if there are too
6730 * many dirty RAID5 blocks.
6733 allow_signal(SIGKILL
);
6734 while (!kthread_should_stop()) {
6736 /* We need to wait INTERRUPTIBLE so that
6737 * we don't add to the load-average.
6738 * That means we need to be sure no signals are
6741 if (signal_pending(current
))
6742 flush_signals(current
);
6744 wait_event_interruptible_timeout
6746 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6747 || kthread_should_stop(),
6750 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6751 if (!kthread_should_stop())
6752 thread
->run(thread
);
6758 void md_wakeup_thread(struct md_thread
*thread
)
6761 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6762 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6763 wake_up(&thread
->wqueue
);
6767 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6768 struct mddev
*mddev
, const char *name
)
6770 struct md_thread
*thread
;
6772 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6776 init_waitqueue_head(&thread
->wqueue
);
6779 thread
->mddev
= mddev
;
6780 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6781 thread
->tsk
= kthread_run(md_thread
, thread
,
6783 mdname(thread
->mddev
),
6785 if (IS_ERR(thread
->tsk
)) {
6792 void md_unregister_thread(struct md_thread
**threadp
)
6794 struct md_thread
*thread
= *threadp
;
6797 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6798 /* Locking ensures that mddev_unlock does not wake_up a
6799 * non-existent thread
6801 spin_lock(&pers_lock
);
6803 spin_unlock(&pers_lock
);
6805 kthread_stop(thread
->tsk
);
6809 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6816 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6819 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6821 mddev
->pers
->error_handler(mddev
,rdev
);
6822 if (mddev
->degraded
)
6823 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6824 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6825 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6826 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6827 md_wakeup_thread(mddev
->thread
);
6828 if (mddev
->event_work
.func
)
6829 queue_work(md_misc_wq
, &mddev
->event_work
);
6830 md_new_event_inintr(mddev
);
6833 /* seq_file implementation /proc/mdstat */
6835 static void status_unused(struct seq_file
*seq
)
6838 struct md_rdev
*rdev
;
6840 seq_printf(seq
, "unused devices: ");
6842 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6843 char b
[BDEVNAME_SIZE
];
6845 seq_printf(seq
, "%s ",
6846 bdevname(rdev
->bdev
,b
));
6849 seq_printf(seq
, "<none>");
6851 seq_printf(seq
, "\n");
6855 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6857 sector_t max_sectors
, resync
, res
;
6858 unsigned long dt
, db
;
6861 unsigned int per_milli
;
6863 if (mddev
->curr_resync
<= 3)
6866 resync
= mddev
->curr_resync
6867 - atomic_read(&mddev
->recovery_active
);
6869 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6870 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6871 max_sectors
= mddev
->resync_max_sectors
;
6873 max_sectors
= mddev
->dev_sectors
;
6876 * Should not happen.
6882 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6883 * in a sector_t, and (max_sectors>>scale) will fit in a
6884 * u32, as those are the requirements for sector_div.
6885 * Thus 'scale' must be at least 10
6888 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6889 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6892 res
= (resync
>>scale
)*1000;
6893 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6897 int i
, x
= per_milli
/50, y
= 20-x
;
6898 seq_printf(seq
, "[");
6899 for (i
= 0; i
< x
; i
++)
6900 seq_printf(seq
, "=");
6901 seq_printf(seq
, ">");
6902 for (i
= 0; i
< y
; i
++)
6903 seq_printf(seq
, ".");
6904 seq_printf(seq
, "] ");
6906 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6907 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6909 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6911 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6912 "resync" : "recovery"))),
6913 per_milli
/10, per_milli
% 10,
6914 (unsigned long long) resync
/2,
6915 (unsigned long long) max_sectors
/2);
6918 * dt: time from mark until now
6919 * db: blocks written from mark until now
6920 * rt: remaining time
6922 * rt is a sector_t, so could be 32bit or 64bit.
6923 * So we divide before multiply in case it is 32bit and close
6925 * We scale the divisor (db) by 32 to avoid losing precision
6926 * near the end of resync when the number of remaining sectors
6928 * We then divide rt by 32 after multiplying by db to compensate.
6929 * The '+1' avoids division by zero if db is very small.
6931 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6933 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6934 - mddev
->resync_mark_cnt
;
6936 rt
= max_sectors
- resync
; /* number of remaining sectors */
6937 sector_div(rt
, db
/32+1);
6941 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6942 ((unsigned long)rt
% 60)/6);
6944 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6947 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6949 struct list_head
*tmp
;
6951 struct mddev
*mddev
;
6959 spin_lock(&all_mddevs_lock
);
6960 list_for_each(tmp
,&all_mddevs
)
6962 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6964 spin_unlock(&all_mddevs_lock
);
6967 spin_unlock(&all_mddevs_lock
);
6969 return (void*)2;/* tail */
6973 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6975 struct list_head
*tmp
;
6976 struct mddev
*next_mddev
, *mddev
= v
;
6982 spin_lock(&all_mddevs_lock
);
6984 tmp
= all_mddevs
.next
;
6986 tmp
= mddev
->all_mddevs
.next
;
6987 if (tmp
!= &all_mddevs
)
6988 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6990 next_mddev
= (void*)2;
6993 spin_unlock(&all_mddevs_lock
);
7001 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7003 struct mddev
*mddev
= v
;
7005 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7009 static int md_seq_show(struct seq_file
*seq
, void *v
)
7011 struct mddev
*mddev
= v
;
7013 struct md_rdev
*rdev
;
7015 if (v
== (void*)1) {
7016 struct md_personality
*pers
;
7017 seq_printf(seq
, "Personalities : ");
7018 spin_lock(&pers_lock
);
7019 list_for_each_entry(pers
, &pers_list
, list
)
7020 seq_printf(seq
, "[%s] ", pers
->name
);
7022 spin_unlock(&pers_lock
);
7023 seq_printf(seq
, "\n");
7024 seq
->poll_event
= atomic_read(&md_event_count
);
7027 if (v
== (void*)2) {
7032 if (mddev_lock(mddev
) < 0)
7035 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7036 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7037 mddev
->pers
? "" : "in");
7040 seq_printf(seq
, " (read-only)");
7042 seq_printf(seq
, " (auto-read-only)");
7043 seq_printf(seq
, " %s", mddev
->pers
->name
);
7047 rdev_for_each(rdev
, mddev
) {
7048 char b
[BDEVNAME_SIZE
];
7049 seq_printf(seq
, " %s[%d]",
7050 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7051 if (test_bit(WriteMostly
, &rdev
->flags
))
7052 seq_printf(seq
, "(W)");
7053 if (test_bit(Faulty
, &rdev
->flags
)) {
7054 seq_printf(seq
, "(F)");
7057 if (rdev
->raid_disk
< 0)
7058 seq_printf(seq
, "(S)"); /* spare */
7059 if (test_bit(Replacement
, &rdev
->flags
))
7060 seq_printf(seq
, "(R)");
7061 sectors
+= rdev
->sectors
;
7064 if (!list_empty(&mddev
->disks
)) {
7066 seq_printf(seq
, "\n %llu blocks",
7067 (unsigned long long)
7068 mddev
->array_sectors
/ 2);
7070 seq_printf(seq
, "\n %llu blocks",
7071 (unsigned long long)sectors
/ 2);
7073 if (mddev
->persistent
) {
7074 if (mddev
->major_version
!= 0 ||
7075 mddev
->minor_version
!= 90) {
7076 seq_printf(seq
," super %d.%d",
7077 mddev
->major_version
,
7078 mddev
->minor_version
);
7080 } else if (mddev
->external
)
7081 seq_printf(seq
, " super external:%s",
7082 mddev
->metadata_type
);
7084 seq_printf(seq
, " super non-persistent");
7087 mddev
->pers
->status(seq
, mddev
);
7088 seq_printf(seq
, "\n ");
7089 if (mddev
->pers
->sync_request
) {
7090 if (mddev
->curr_resync
> 2) {
7091 status_resync(seq
, mddev
);
7092 seq_printf(seq
, "\n ");
7093 } else if (mddev
->curr_resync
>= 1)
7094 seq_printf(seq
, "\tresync=DELAYED\n ");
7095 else if (mddev
->recovery_cp
< MaxSector
)
7096 seq_printf(seq
, "\tresync=PENDING\n ");
7099 seq_printf(seq
, "\n ");
7101 bitmap_status(seq
, mddev
->bitmap
);
7103 seq_printf(seq
, "\n");
7105 mddev_unlock(mddev
);
7110 static const struct seq_operations md_seq_ops
= {
7111 .start
= md_seq_start
,
7112 .next
= md_seq_next
,
7113 .stop
= md_seq_stop
,
7114 .show
= md_seq_show
,
7117 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7119 struct seq_file
*seq
;
7122 error
= seq_open(file
, &md_seq_ops
);
7126 seq
= file
->private_data
;
7127 seq
->poll_event
= atomic_read(&md_event_count
);
7131 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7133 struct seq_file
*seq
= filp
->private_data
;
7136 poll_wait(filp
, &md_event_waiters
, wait
);
7138 /* always allow read */
7139 mask
= POLLIN
| POLLRDNORM
;
7141 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7142 mask
|= POLLERR
| POLLPRI
;
7146 static const struct file_operations md_seq_fops
= {
7147 .owner
= THIS_MODULE
,
7148 .open
= md_seq_open
,
7150 .llseek
= seq_lseek
,
7151 .release
= seq_release_private
,
7152 .poll
= mdstat_poll
,
7155 int register_md_personality(struct md_personality
*p
)
7157 spin_lock(&pers_lock
);
7158 list_add_tail(&p
->list
, &pers_list
);
7159 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7160 spin_unlock(&pers_lock
);
7164 int unregister_md_personality(struct md_personality
*p
)
7166 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7167 spin_lock(&pers_lock
);
7168 list_del_init(&p
->list
);
7169 spin_unlock(&pers_lock
);
7173 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7175 struct md_rdev
* rdev
;
7181 rdev_for_each_rcu(rdev
, mddev
) {
7182 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7183 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7184 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7185 atomic_read(&disk
->sync_io
);
7186 /* sync IO will cause sync_io to increase before the disk_stats
7187 * as sync_io is counted when a request starts, and
7188 * disk_stats is counted when it completes.
7189 * So resync activity will cause curr_events to be smaller than
7190 * when there was no such activity.
7191 * non-sync IO will cause disk_stat to increase without
7192 * increasing sync_io so curr_events will (eventually)
7193 * be larger than it was before. Once it becomes
7194 * substantially larger, the test below will cause
7195 * the array to appear non-idle, and resync will slow
7197 * If there is a lot of outstanding resync activity when
7198 * we set last_event to curr_events, then all that activity
7199 * completing might cause the array to appear non-idle
7200 * and resync will be slowed down even though there might
7201 * not have been non-resync activity. This will only
7202 * happen once though. 'last_events' will soon reflect
7203 * the state where there is little or no outstanding
7204 * resync requests, and further resync activity will
7205 * always make curr_events less than last_events.
7208 if (init
|| curr_events
- rdev
->last_events
> 64) {
7209 rdev
->last_events
= curr_events
;
7217 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7219 /* another "blocks" (512byte) blocks have been synced */
7220 atomic_sub(blocks
, &mddev
->recovery_active
);
7221 wake_up(&mddev
->recovery_wait
);
7223 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7224 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7225 md_wakeup_thread(mddev
->thread
);
7226 // stop recovery, signal do_sync ....
7231 /* md_write_start(mddev, bi)
7232 * If we need to update some array metadata (e.g. 'active' flag
7233 * in superblock) before writing, schedule a superblock update
7234 * and wait for it to complete.
7236 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7239 if (bio_data_dir(bi
) != WRITE
)
7242 BUG_ON(mddev
->ro
== 1);
7243 if (mddev
->ro
== 2) {
7244 /* need to switch to read/write */
7246 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7247 md_wakeup_thread(mddev
->thread
);
7248 md_wakeup_thread(mddev
->sync_thread
);
7251 atomic_inc(&mddev
->writes_pending
);
7252 if (mddev
->safemode
== 1)
7253 mddev
->safemode
= 0;
7254 if (mddev
->in_sync
) {
7255 spin_lock_irq(&mddev
->write_lock
);
7256 if (mddev
->in_sync
) {
7258 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7259 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7260 md_wakeup_thread(mddev
->thread
);
7263 spin_unlock_irq(&mddev
->write_lock
);
7266 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7267 wait_event(mddev
->sb_wait
,
7268 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7271 void md_write_end(struct mddev
*mddev
)
7273 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7274 if (mddev
->safemode
== 2)
7275 md_wakeup_thread(mddev
->thread
);
7276 else if (mddev
->safemode_delay
)
7277 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7281 /* md_allow_write(mddev)
7282 * Calling this ensures that the array is marked 'active' so that writes
7283 * may proceed without blocking. It is important to call this before
7284 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7285 * Must be called with mddev_lock held.
7287 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7288 * is dropped, so return -EAGAIN after notifying userspace.
7290 int md_allow_write(struct mddev
*mddev
)
7296 if (!mddev
->pers
->sync_request
)
7299 spin_lock_irq(&mddev
->write_lock
);
7300 if (mddev
->in_sync
) {
7302 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7303 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7304 if (mddev
->safemode_delay
&&
7305 mddev
->safemode
== 0)
7306 mddev
->safemode
= 1;
7307 spin_unlock_irq(&mddev
->write_lock
);
7308 md_update_sb(mddev
, 0);
7309 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7311 spin_unlock_irq(&mddev
->write_lock
);
7313 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7318 EXPORT_SYMBOL_GPL(md_allow_write
);
7320 #define SYNC_MARKS 10
7321 #define SYNC_MARK_STEP (3*HZ)
7322 #define UPDATE_FREQUENCY (5*60*HZ)
7323 void md_do_sync(struct md_thread
*thread
)
7325 struct mddev
*mddev
= thread
->mddev
;
7326 struct mddev
*mddev2
;
7327 unsigned int currspeed
= 0,
7329 sector_t max_sectors
,j
, io_sectors
;
7330 unsigned long mark
[SYNC_MARKS
];
7331 unsigned long update_time
;
7332 sector_t mark_cnt
[SYNC_MARKS
];
7334 struct list_head
*tmp
;
7335 sector_t last_check
;
7337 struct md_rdev
*rdev
;
7339 struct blk_plug plug
;
7341 /* just incase thread restarts... */
7342 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7344 if (mddev
->ro
) {/* never try to sync a read-only array */
7345 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7349 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7350 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
7351 desc
= "data-check";
7352 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7353 desc
= "requested-resync";
7356 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7361 /* we overload curr_resync somewhat here.
7362 * 0 == not engaged in resync at all
7363 * 2 == checking that there is no conflict with another sync
7364 * 1 == like 2, but have yielded to allow conflicting resync to
7366 * other == active in resync - this many blocks
7368 * Before starting a resync we must have set curr_resync to
7369 * 2, and then checked that every "conflicting" array has curr_resync
7370 * less than ours. When we find one that is the same or higher
7371 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7372 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7373 * This will mean we have to start checking from the beginning again.
7380 mddev
->curr_resync
= 2;
7384 if (kthread_freezable_should_stop(NULL
))
7385 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7387 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7389 for_each_mddev(mddev2
, tmp
) {
7390 if (mddev2
== mddev
)
7392 if (!mddev
->parallel_resync
7393 && mddev2
->curr_resync
7394 && match_mddev_units(mddev
, mddev2
)) {
7396 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7397 /* arbitrarily yield */
7398 mddev
->curr_resync
= 1;
7399 wake_up(&resync_wait
);
7401 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7402 /* no need to wait here, we can wait the next
7403 * time 'round when curr_resync == 2
7409 /* We need to wait 'interruptible' so as not to
7410 * contribute to the load average, and not to
7411 * be caught by 'softlockup'
7413 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7414 if (!kthread_should_stop() &&
7415 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7416 printk(KERN_INFO
"md: delaying %s of %s"
7417 " until %s has finished (they"
7418 " share one or more physical units)\n",
7419 desc
, mdname(mddev
), mdname(mddev2
));
7422 if (signal_pending(current
))
7423 flush_signals(current
);
7425 finish_wait(&resync_wait
, &wq
);
7428 finish_wait(&resync_wait
, &wq
);
7431 } while (mddev
->curr_resync
< 2);
7434 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7435 /* resync follows the size requested by the personality,
7436 * which defaults to physical size, but can be virtual size
7438 max_sectors
= mddev
->resync_max_sectors
;
7439 atomic64_set(&mddev
->resync_mismatches
, 0);
7440 /* we don't use the checkpoint if there's a bitmap */
7441 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7442 j
= mddev
->resync_min
;
7443 else if (!mddev
->bitmap
)
7444 j
= mddev
->recovery_cp
;
7446 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7447 max_sectors
= mddev
->resync_max_sectors
;
7449 /* recovery follows the physical size of devices */
7450 max_sectors
= mddev
->dev_sectors
;
7453 rdev_for_each_rcu(rdev
, mddev
)
7454 if (rdev
->raid_disk
>= 0 &&
7455 !test_bit(Faulty
, &rdev
->flags
) &&
7456 !test_bit(In_sync
, &rdev
->flags
) &&
7457 rdev
->recovery_offset
< j
)
7458 j
= rdev
->recovery_offset
;
7461 /* If there is a bitmap, we need to make sure all
7462 * writes that started before we added a spare
7463 * complete before we start doing a recovery.
7464 * Otherwise the write might complete and (via
7465 * bitmap_endwrite) set a bit in the bitmap after the
7466 * recovery has checked that bit and skipped that
7469 if (mddev
->bitmap
) {
7470 mddev
->pers
->quiesce(mddev
, 1);
7471 mddev
->pers
->quiesce(mddev
, 0);
7475 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7476 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7477 " %d KB/sec/disk.\n", speed_min(mddev
));
7478 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7479 "(but not more than %d KB/sec) for %s.\n",
7480 speed_max(mddev
), desc
);
7482 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7485 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7487 mark_cnt
[m
] = io_sectors
;
7490 mddev
->resync_mark
= mark
[last_mark
];
7491 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7494 * Tune reconstruction:
7496 window
= 32*(PAGE_SIZE
/512);
7497 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7498 window
/2, (unsigned long long)max_sectors
/2);
7500 atomic_set(&mddev
->recovery_active
, 0);
7505 "md: resuming %s of %s from checkpoint.\n",
7506 desc
, mdname(mddev
));
7507 mddev
->curr_resync
= j
;
7509 mddev
->curr_resync
= 3; /* no longer delayed */
7510 mddev
->curr_resync_completed
= j
;
7511 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7512 md_new_event(mddev
);
7513 update_time
= jiffies
;
7515 blk_start_plug(&plug
);
7516 while (j
< max_sectors
) {
7521 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7522 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7523 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7524 > (max_sectors
>> 4)) ||
7525 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7526 (j
- mddev
->curr_resync_completed
)*2
7527 >= mddev
->resync_max
- mddev
->curr_resync_completed
7529 /* time to update curr_resync_completed */
7530 wait_event(mddev
->recovery_wait
,
7531 atomic_read(&mddev
->recovery_active
) == 0);
7532 mddev
->curr_resync_completed
= j
;
7533 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7534 j
> mddev
->recovery_cp
)
7535 mddev
->recovery_cp
= j
;
7536 update_time
= jiffies
;
7537 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7538 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7541 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
7542 /* As this condition is controlled by user-space,
7543 * we can block indefinitely, so use '_interruptible'
7544 * to avoid triggering warnings.
7546 flush_signals(current
); /* just in case */
7547 wait_event_interruptible(mddev
->recovery_wait
,
7548 mddev
->resync_max
> j
7549 || kthread_should_stop());
7552 if (kthread_freezable_should_stop(NULL
))
7555 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7556 currspeed
< speed_min(mddev
));
7558 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7562 if (!skipped
) { /* actual IO requested */
7563 io_sectors
+= sectors
;
7564 atomic_add(sectors
, &mddev
->recovery_active
);
7567 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7572 mddev
->curr_resync
= j
;
7573 mddev
->curr_mark_cnt
= io_sectors
;
7574 if (last_check
== 0)
7575 /* this is the earliest that rebuild will be
7576 * visible in /proc/mdstat
7578 md_new_event(mddev
);
7580 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7583 last_check
= io_sectors
;
7585 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7587 int next
= (last_mark
+1) % SYNC_MARKS
;
7589 mddev
->resync_mark
= mark
[next
];
7590 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7591 mark
[next
] = jiffies
;
7592 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7596 if (kthread_freezable_should_stop(NULL
))
7601 * this loop exits only if either when we are slower than
7602 * the 'hard' speed limit, or the system was IO-idle for
7604 * the system might be non-idle CPU-wise, but we only care
7605 * about not overloading the IO subsystem. (things like an
7606 * e2fsck being done on the RAID array should execute fast)
7610 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7611 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7613 if (currspeed
> speed_min(mddev
)) {
7614 if ((currspeed
> speed_max(mddev
)) ||
7615 !is_mddev_idle(mddev
, 0)) {
7621 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7623 * this also signals 'finished resyncing' to md_stop
7626 blk_finish_plug(&plug
);
7627 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7629 /* tell personality that we are finished */
7630 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7632 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7633 mddev
->curr_resync
> 2) {
7634 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7635 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7636 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7638 "md: checkpointing %s of %s.\n",
7639 desc
, mdname(mddev
));
7640 if (test_bit(MD_RECOVERY_ERROR
,
7642 mddev
->recovery_cp
=
7643 mddev
->curr_resync_completed
;
7645 mddev
->recovery_cp
=
7649 mddev
->recovery_cp
= MaxSector
;
7651 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7652 mddev
->curr_resync
= MaxSector
;
7654 rdev_for_each_rcu(rdev
, mddev
)
7655 if (rdev
->raid_disk
>= 0 &&
7656 mddev
->delta_disks
>= 0 &&
7657 !test_bit(Faulty
, &rdev
->flags
) &&
7658 !test_bit(In_sync
, &rdev
->flags
) &&
7659 rdev
->recovery_offset
< mddev
->curr_resync
)
7660 rdev
->recovery_offset
= mddev
->curr_resync
;
7665 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7667 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7668 /* We completed so min/max setting can be forgotten if used. */
7669 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7670 mddev
->resync_min
= 0;
7671 mddev
->resync_max
= MaxSector
;
7672 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7673 mddev
->resync_min
= mddev
->curr_resync_completed
;
7674 mddev
->curr_resync
= 0;
7675 wake_up(&resync_wait
);
7676 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7677 md_wakeup_thread(mddev
->thread
);
7682 * got a signal, exit.
7685 "md: md_do_sync() got signal ... exiting\n");
7686 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7690 EXPORT_SYMBOL_GPL(md_do_sync
);
7692 static int remove_and_add_spares(struct mddev
*mddev
,
7693 struct md_rdev
*this)
7695 struct md_rdev
*rdev
;
7699 rdev_for_each(rdev
, mddev
)
7700 if ((this == NULL
|| rdev
== this) &&
7701 rdev
->raid_disk
>= 0 &&
7702 !test_bit(Blocked
, &rdev
->flags
) &&
7703 (test_bit(Faulty
, &rdev
->flags
) ||
7704 ! test_bit(In_sync
, &rdev
->flags
)) &&
7705 atomic_read(&rdev
->nr_pending
)==0) {
7706 if (mddev
->pers
->hot_remove_disk(
7707 mddev
, rdev
) == 0) {
7708 sysfs_unlink_rdev(mddev
, rdev
);
7709 rdev
->raid_disk
= -1;
7713 if (removed
&& mddev
->kobj
.sd
)
7714 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7719 rdev_for_each(rdev
, mddev
) {
7720 if (rdev
->raid_disk
>= 0 &&
7721 !test_bit(In_sync
, &rdev
->flags
) &&
7722 !test_bit(Faulty
, &rdev
->flags
))
7724 if (rdev
->raid_disk
>= 0)
7726 if (test_bit(Faulty
, &rdev
->flags
))
7729 ! (rdev
->saved_raid_disk
>= 0 &&
7730 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7733 rdev
->recovery_offset
= 0;
7735 hot_add_disk(mddev
, rdev
) == 0) {
7736 if (sysfs_link_rdev(mddev
, rdev
))
7737 /* failure here is OK */;
7739 md_new_event(mddev
);
7740 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7745 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7750 * This routine is regularly called by all per-raid-array threads to
7751 * deal with generic issues like resync and super-block update.
7752 * Raid personalities that don't have a thread (linear/raid0) do not
7753 * need this as they never do any recovery or update the superblock.
7755 * It does not do any resync itself, but rather "forks" off other threads
7756 * to do that as needed.
7757 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7758 * "->recovery" and create a thread at ->sync_thread.
7759 * When the thread finishes it sets MD_RECOVERY_DONE
7760 * and wakeups up this thread which will reap the thread and finish up.
7761 * This thread also removes any faulty devices (with nr_pending == 0).
7763 * The overall approach is:
7764 * 1/ if the superblock needs updating, update it.
7765 * 2/ If a recovery thread is running, don't do anything else.
7766 * 3/ If recovery has finished, clean up, possibly marking spares active.
7767 * 4/ If there are any faulty devices, remove them.
7768 * 5/ If array is degraded, try to add spares devices
7769 * 6/ If array has spares or is not in-sync, start a resync thread.
7771 void md_check_recovery(struct mddev
*mddev
)
7773 #ifdef CONFIG_FREEZER
7774 if (mddev
->suspended
|| unlikely(atomic_read(&system_freezing_cnt
)))
7779 bitmap_daemon_work(mddev
);
7781 if (signal_pending(current
)) {
7782 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7783 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7785 mddev
->safemode
= 2;
7787 flush_signals(current
);
7790 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7793 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7794 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7795 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7796 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7797 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7798 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7802 if (mddev_trylock(mddev
)) {
7806 /* On a read-only array we can:
7807 * - remove failed devices
7808 * - add already-in_sync devices if the array itself
7810 * As we only add devices that are already in-sync,
7811 * we can activate the spares immediately.
7813 remove_and_add_spares(mddev
, NULL
);
7814 /* There is no thread, but we need to call
7815 * ->spare_active and clear saved_raid_disk
7817 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7818 md_reap_sync_thread(mddev
);
7819 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7823 if (!mddev
->external
) {
7825 spin_lock_irq(&mddev
->write_lock
);
7826 if (mddev
->safemode
&&
7827 !atomic_read(&mddev
->writes_pending
) &&
7829 mddev
->recovery_cp
== MaxSector
) {
7832 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7834 if (mddev
->safemode
== 1)
7835 mddev
->safemode
= 0;
7836 spin_unlock_irq(&mddev
->write_lock
);
7838 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7842 md_update_sb(mddev
, 0);
7844 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7845 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7846 /* resync/recovery still happening */
7847 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7850 if (mddev
->sync_thread
) {
7851 md_reap_sync_thread(mddev
);
7854 /* Set RUNNING before clearing NEEDED to avoid
7855 * any transients in the value of "sync_action".
7857 mddev
->curr_resync_completed
= 0;
7858 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7859 /* Clear some bits that don't mean anything, but
7862 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7863 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7865 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7866 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7868 /* no recovery is running.
7869 * remove any failed drives, then
7870 * add spares if possible.
7871 * Spares are also removed and re-added, to allow
7872 * the personality to fail the re-add.
7875 if (mddev
->reshape_position
!= MaxSector
) {
7876 if (mddev
->pers
->check_reshape
== NULL
||
7877 mddev
->pers
->check_reshape(mddev
) != 0)
7878 /* Cannot proceed */
7880 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7881 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7882 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7883 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7884 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7885 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7886 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7887 } else if (mddev
->recovery_cp
< MaxSector
) {
7888 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7889 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7890 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7891 /* nothing to be done ... */
7894 if (mddev
->pers
->sync_request
) {
7896 /* We are adding a device or devices to an array
7897 * which has the bitmap stored on all devices.
7898 * So make sure all bitmap pages get written
7900 bitmap_write_all(mddev
->bitmap
);
7902 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7905 if (!mddev
->sync_thread
) {
7906 printk(KERN_ERR
"%s: could not start resync"
7909 /* leave the spares where they are, it shouldn't hurt */
7910 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7911 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7912 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7913 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7914 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7916 md_wakeup_thread(mddev
->sync_thread
);
7917 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7918 md_new_event(mddev
);
7921 if (!mddev
->sync_thread
) {
7922 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7923 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7925 if (mddev
->sysfs_action
)
7926 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7928 mddev_unlock(mddev
);
7932 void md_reap_sync_thread(struct mddev
*mddev
)
7934 struct md_rdev
*rdev
;
7936 /* resync has finished, collect result */
7937 md_unregister_thread(&mddev
->sync_thread
);
7938 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7939 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7941 /* activate any spares */
7942 if (mddev
->pers
->spare_active(mddev
)) {
7943 sysfs_notify(&mddev
->kobj
, NULL
,
7945 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7948 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7949 mddev
->pers
->finish_reshape
)
7950 mddev
->pers
->finish_reshape(mddev
);
7952 /* If array is no-longer degraded, then any saved_raid_disk
7953 * information must be scrapped. Also if any device is now
7954 * In_sync we must scrape the saved_raid_disk for that device
7955 * do the superblock for an incrementally recovered device
7958 rdev_for_each(rdev
, mddev
)
7959 if (!mddev
->degraded
||
7960 test_bit(In_sync
, &rdev
->flags
))
7961 rdev
->saved_raid_disk
= -1;
7963 md_update_sb(mddev
, 1);
7964 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7965 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7966 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7967 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7968 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7969 /* flag recovery needed just to double check */
7970 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7971 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7972 md_new_event(mddev
);
7973 if (mddev
->event_work
.func
)
7974 queue_work(md_misc_wq
, &mddev
->event_work
);
7977 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7979 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7980 wait_event_timeout(rdev
->blocked_wait
,
7981 !test_bit(Blocked
, &rdev
->flags
) &&
7982 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7983 msecs_to_jiffies(5000));
7984 rdev_dec_pending(rdev
, mddev
);
7986 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7988 void md_finish_reshape(struct mddev
*mddev
)
7990 /* called be personality module when reshape completes. */
7991 struct md_rdev
*rdev
;
7993 rdev_for_each(rdev
, mddev
) {
7994 if (rdev
->data_offset
> rdev
->new_data_offset
)
7995 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7997 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7998 rdev
->data_offset
= rdev
->new_data_offset
;
8001 EXPORT_SYMBOL(md_finish_reshape
);
8003 /* Bad block management.
8004 * We can record which blocks on each device are 'bad' and so just
8005 * fail those blocks, or that stripe, rather than the whole device.
8006 * Entries in the bad-block table are 64bits wide. This comprises:
8007 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8008 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8009 * A 'shift' can be set so that larger blocks are tracked and
8010 * consequently larger devices can be covered.
8011 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8013 * Locking of the bad-block table uses a seqlock so md_is_badblock
8014 * might need to retry if it is very unlucky.
8015 * We will sometimes want to check for bad blocks in a bi_end_io function,
8016 * so we use the write_seqlock_irq variant.
8018 * When looking for a bad block we specify a range and want to
8019 * know if any block in the range is bad. So we binary-search
8020 * to the last range that starts at-or-before the given endpoint,
8021 * (or "before the sector after the target range")
8022 * then see if it ends after the given start.
8024 * 0 if there are no known bad blocks in the range
8025 * 1 if there are known bad block which are all acknowledged
8026 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8027 * plus the start/length of the first bad section we overlap.
8029 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8030 sector_t
*first_bad
, int *bad_sectors
)
8036 sector_t target
= s
+ sectors
;
8039 if (bb
->shift
> 0) {
8040 /* round the start down, and the end up */
8042 target
+= (1<<bb
->shift
) - 1;
8043 target
>>= bb
->shift
;
8044 sectors
= target
- s
;
8046 /* 'target' is now the first block after the bad range */
8049 seq
= read_seqbegin(&bb
->lock
);
8054 /* Binary search between lo and hi for 'target'
8055 * i.e. for the last range that starts before 'target'
8057 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8058 * are known not to be the last range before target.
8059 * VARIANT: hi-lo is the number of possible
8060 * ranges, and decreases until it reaches 1
8062 while (hi
- lo
> 1) {
8063 int mid
= (lo
+ hi
) / 2;
8064 sector_t a
= BB_OFFSET(p
[mid
]);
8066 /* This could still be the one, earlier ranges
8070 /* This and later ranges are definitely out. */
8073 /* 'lo' might be the last that started before target, but 'hi' isn't */
8075 /* need to check all range that end after 's' to see if
8076 * any are unacknowledged.
8079 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8080 if (BB_OFFSET(p
[lo
]) < target
) {
8081 /* starts before the end, and finishes after
8082 * the start, so they must overlap
8084 if (rv
!= -1 && BB_ACK(p
[lo
]))
8088 *first_bad
= BB_OFFSET(p
[lo
]);
8089 *bad_sectors
= BB_LEN(p
[lo
]);
8095 if (read_seqretry(&bb
->lock
, seq
))
8100 EXPORT_SYMBOL_GPL(md_is_badblock
);
8103 * Add a range of bad blocks to the table.
8104 * This might extend the table, or might contract it
8105 * if two adjacent ranges can be merged.
8106 * We binary-search to find the 'insertion' point, then
8107 * decide how best to handle it.
8109 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8115 unsigned long flags
;
8118 /* badblocks are disabled */
8122 /* round the start down, and the end up */
8123 sector_t next
= s
+ sectors
;
8125 next
+= (1<<bb
->shift
) - 1;
8130 write_seqlock_irqsave(&bb
->lock
, flags
);
8135 /* Find the last range that starts at-or-before 's' */
8136 while (hi
- lo
> 1) {
8137 int mid
= (lo
+ hi
) / 2;
8138 sector_t a
= BB_OFFSET(p
[mid
]);
8144 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8148 /* we found a range that might merge with the start
8151 sector_t a
= BB_OFFSET(p
[lo
]);
8152 sector_t e
= a
+ BB_LEN(p
[lo
]);
8153 int ack
= BB_ACK(p
[lo
]);
8155 /* Yes, we can merge with a previous range */
8156 if (s
== a
&& s
+ sectors
>= e
)
8157 /* new range covers old */
8160 ack
= ack
&& acknowledged
;
8162 if (e
< s
+ sectors
)
8164 if (e
- a
<= BB_MAX_LEN
) {
8165 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8168 /* does not all fit in one range,
8169 * make p[lo] maximal
8171 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8172 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8178 if (sectors
&& hi
< bb
->count
) {
8179 /* 'hi' points to the first range that starts after 's'.
8180 * Maybe we can merge with the start of that range */
8181 sector_t a
= BB_OFFSET(p
[hi
]);
8182 sector_t e
= a
+ BB_LEN(p
[hi
]);
8183 int ack
= BB_ACK(p
[hi
]);
8184 if (a
<= s
+ sectors
) {
8185 /* merging is possible */
8186 if (e
<= s
+ sectors
) {
8191 ack
= ack
&& acknowledged
;
8194 if (e
- a
<= BB_MAX_LEN
) {
8195 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8198 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8206 if (sectors
== 0 && hi
< bb
->count
) {
8207 /* we might be able to combine lo and hi */
8208 /* Note: 's' is at the end of 'lo' */
8209 sector_t a
= BB_OFFSET(p
[hi
]);
8210 int lolen
= BB_LEN(p
[lo
]);
8211 int hilen
= BB_LEN(p
[hi
]);
8212 int newlen
= lolen
+ hilen
- (s
- a
);
8213 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8214 /* yes, we can combine them */
8215 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8216 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8217 memmove(p
+ hi
, p
+ hi
+ 1,
8218 (bb
->count
- hi
- 1) * 8);
8223 /* didn't merge (it all).
8224 * Need to add a range just before 'hi' */
8225 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8226 /* No room for more */
8230 int this_sectors
= sectors
;
8231 memmove(p
+ hi
+ 1, p
+ hi
,
8232 (bb
->count
- hi
) * 8);
8235 if (this_sectors
> BB_MAX_LEN
)
8236 this_sectors
= BB_MAX_LEN
;
8237 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8238 sectors
-= this_sectors
;
8245 bb
->unacked_exist
= 1;
8246 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8251 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8256 s
+= rdev
->new_data_offset
;
8258 s
+= rdev
->data_offset
;
8259 rv
= md_set_badblocks(&rdev
->badblocks
,
8262 /* Make sure they get written out promptly */
8263 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8264 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8265 md_wakeup_thread(rdev
->mddev
->thread
);
8269 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8272 * Remove a range of bad blocks from the table.
8273 * This may involve extending the table if we spilt a region,
8274 * but it must not fail. So if the table becomes full, we just
8275 * drop the remove request.
8277 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8281 sector_t target
= s
+ sectors
;
8284 if (bb
->shift
> 0) {
8285 /* When clearing we round the start up and the end down.
8286 * This should not matter as the shift should align with
8287 * the block size and no rounding should ever be needed.
8288 * However it is better the think a block is bad when it
8289 * isn't than to think a block is not bad when it is.
8291 s
+= (1<<bb
->shift
) - 1;
8293 target
>>= bb
->shift
;
8294 sectors
= target
- s
;
8297 write_seqlock_irq(&bb
->lock
);
8302 /* Find the last range that starts before 'target' */
8303 while (hi
- lo
> 1) {
8304 int mid
= (lo
+ hi
) / 2;
8305 sector_t a
= BB_OFFSET(p
[mid
]);
8312 /* p[lo] is the last range that could overlap the
8313 * current range. Earlier ranges could also overlap,
8314 * but only this one can overlap the end of the range.
8316 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8317 /* Partial overlap, leave the tail of this range */
8318 int ack
= BB_ACK(p
[lo
]);
8319 sector_t a
= BB_OFFSET(p
[lo
]);
8320 sector_t end
= a
+ BB_LEN(p
[lo
]);
8323 /* we need to split this range */
8324 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8328 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8330 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8333 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8334 /* there is no longer an overlap */
8339 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8340 /* This range does overlap */
8341 if (BB_OFFSET(p
[lo
]) < s
) {
8342 /* Keep the early parts of this range. */
8343 int ack
= BB_ACK(p
[lo
]);
8344 sector_t start
= BB_OFFSET(p
[lo
]);
8345 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8346 /* now low doesn't overlap, so.. */
8351 /* 'lo' is strictly before, 'hi' is strictly after,
8352 * anything between needs to be discarded
8355 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8356 bb
->count
-= (hi
- lo
- 1);
8362 write_sequnlock_irq(&bb
->lock
);
8366 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8370 s
+= rdev
->new_data_offset
;
8372 s
+= rdev
->data_offset
;
8373 return md_clear_badblocks(&rdev
->badblocks
,
8376 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8379 * Acknowledge all bad blocks in a list.
8380 * This only succeeds if ->changed is clear. It is used by
8381 * in-kernel metadata updates
8383 void md_ack_all_badblocks(struct badblocks
*bb
)
8385 if (bb
->page
== NULL
|| bb
->changed
)
8386 /* no point even trying */
8388 write_seqlock_irq(&bb
->lock
);
8390 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8393 for (i
= 0; i
< bb
->count
; i
++) {
8394 if (!BB_ACK(p
[i
])) {
8395 sector_t start
= BB_OFFSET(p
[i
]);
8396 int len
= BB_LEN(p
[i
]);
8397 p
[i
] = BB_MAKE(start
, len
, 1);
8400 bb
->unacked_exist
= 0;
8402 write_sequnlock_irq(&bb
->lock
);
8404 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8406 /* sysfs access to bad-blocks list.
8407 * We present two files.
8408 * 'bad-blocks' lists sector numbers and lengths of ranges that
8409 * are recorded as bad. The list is truncated to fit within
8410 * the one-page limit of sysfs.
8411 * Writing "sector length" to this file adds an acknowledged
8413 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8414 * been acknowledged. Writing to this file adds bad blocks
8415 * without acknowledging them. This is largely for testing.
8419 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8430 seq
= read_seqbegin(&bb
->lock
);
8435 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8436 sector_t s
= BB_OFFSET(p
[i
]);
8437 unsigned int length
= BB_LEN(p
[i
]);
8438 int ack
= BB_ACK(p
[i
]);
8444 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8445 (unsigned long long)s
<< bb
->shift
,
8446 length
<< bb
->shift
);
8448 if (unack
&& len
== 0)
8449 bb
->unacked_exist
= 0;
8451 if (read_seqretry(&bb
->lock
, seq
))
8460 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8462 unsigned long long sector
;
8466 /* Allow clearing via sysfs *only* for testing/debugging.
8467 * Normally only a successful write may clear a badblock
8470 if (page
[0] == '-') {
8474 #endif /* DO_DEBUG */
8476 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8478 if (newline
!= '\n')
8490 md_clear_badblocks(bb
, sector
, length
);
8493 #endif /* DO_DEBUG */
8494 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8500 static int md_notify_reboot(struct notifier_block
*this,
8501 unsigned long code
, void *x
)
8503 struct list_head
*tmp
;
8504 struct mddev
*mddev
;
8507 for_each_mddev(mddev
, tmp
) {
8508 if (mddev_trylock(mddev
)) {
8510 __md_stop_writes(mddev
);
8511 if (mddev
->persistent
)
8512 mddev
->safemode
= 2;
8513 mddev_unlock(mddev
);
8518 * certain more exotic SCSI devices are known to be
8519 * volatile wrt too early system reboots. While the
8520 * right place to handle this issue is the given
8521 * driver, we do want to have a safe RAID driver ...
8529 static struct notifier_block md_notifier
= {
8530 .notifier_call
= md_notify_reboot
,
8532 .priority
= INT_MAX
, /* before any real devices */
8535 static void md_geninit(void)
8537 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8539 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8542 static int __init
md_init(void)
8546 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8550 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8554 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8557 if ((ret
= register_blkdev(0, "mdp")) < 0)
8561 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8562 md_probe
, NULL
, NULL
);
8563 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8564 md_probe
, NULL
, NULL
);
8566 register_reboot_notifier(&md_notifier
);
8567 raid_table_header
= register_sysctl_table(raid_root_table
);
8573 unregister_blkdev(MD_MAJOR
, "md");
8575 destroy_workqueue(md_misc_wq
);
8577 destroy_workqueue(md_wq
);
8585 * Searches all registered partitions for autorun RAID arrays
8589 static LIST_HEAD(all_detected_devices
);
8590 struct detected_devices_node
{
8591 struct list_head list
;
8595 void md_autodetect_dev(dev_t dev
)
8597 struct detected_devices_node
*node_detected_dev
;
8599 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8600 if (node_detected_dev
) {
8601 node_detected_dev
->dev
= dev
;
8602 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8604 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8605 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8610 static void autostart_arrays(int part
)
8612 struct md_rdev
*rdev
;
8613 struct detected_devices_node
*node_detected_dev
;
8615 int i_scanned
, i_passed
;
8620 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8622 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8624 node_detected_dev
= list_entry(all_detected_devices
.next
,
8625 struct detected_devices_node
, list
);
8626 list_del(&node_detected_dev
->list
);
8627 dev
= node_detected_dev
->dev
;
8628 kfree(node_detected_dev
);
8629 rdev
= md_import_device(dev
,0, 90);
8633 if (test_bit(Faulty
, &rdev
->flags
)) {
8637 set_bit(AutoDetected
, &rdev
->flags
);
8638 list_add(&rdev
->same_set
, &pending_raid_disks
);
8642 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8643 i_scanned
, i_passed
);
8645 autorun_devices(part
);
8648 #endif /* !MODULE */
8650 static __exit
void md_exit(void)
8652 struct mddev
*mddev
;
8653 struct list_head
*tmp
;
8655 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8656 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8658 unregister_blkdev(MD_MAJOR
,"md");
8659 unregister_blkdev(mdp_major
, "mdp");
8660 unregister_reboot_notifier(&md_notifier
);
8661 unregister_sysctl_table(raid_table_header
);
8662 remove_proc_entry("mdstat", NULL
);
8663 for_each_mddev(mddev
, tmp
) {
8664 export_array(mddev
);
8665 mddev
->hold_active
= 0;
8667 destroy_workqueue(md_misc_wq
);
8668 destroy_workqueue(md_wq
);
8671 subsys_initcall(md_init
);
8672 module_exit(md_exit
)
8674 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8676 return sprintf(buffer
, "%d", start_readonly
);
8678 static int set_ro(const char *val
, struct kernel_param
*kp
)
8681 int num
= simple_strtoul(val
, &e
, 10);
8682 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8683 start_readonly
= num
;
8689 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8690 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8692 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8694 EXPORT_SYMBOL(register_md_personality
);
8695 EXPORT_SYMBOL(unregister_md_personality
);
8696 EXPORT_SYMBOL(md_error
);
8697 EXPORT_SYMBOL(md_done_sync
);
8698 EXPORT_SYMBOL(md_write_start
);
8699 EXPORT_SYMBOL(md_write_end
);
8700 EXPORT_SYMBOL(md_register_thread
);
8701 EXPORT_SYMBOL(md_unregister_thread
);
8702 EXPORT_SYMBOL(md_wakeup_thread
);
8703 EXPORT_SYMBOL(md_check_recovery
);
8704 EXPORT_SYMBOL(md_reap_sync_thread
);
8705 MODULE_LICENSE("GPL");
8706 MODULE_DESCRIPTION("MD RAID framework");
8708 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);