2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 static void autostart_arrays(int part
);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list
);
67 static DEFINE_SPINLOCK(pers_lock
);
69 static void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
72 static struct workqueue_struct
*md_wq
;
73 static struct workqueue_struct
*md_misc_wq
;
75 static int remove_and_add_spares(struct mddev
*mddev
,
76 struct md_rdev
*this);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min
= 1000;
100 static int sysctl_speed_limit_max
= 200000;
101 static inline int speed_min(struct mddev
*mddev
)
103 return mddev
->sync_speed_min
?
104 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
107 static inline int speed_max(struct mddev
*mddev
)
109 return mddev
->sync_speed_max
?
110 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
113 static struct ctl_table_header
*raid_table_header
;
115 static ctl_table raid_table
[] = {
117 .procname
= "speed_limit_min",
118 .data
= &sysctl_speed_limit_min
,
119 .maxlen
= sizeof(int),
120 .mode
= S_IRUGO
|S_IWUSR
,
121 .proc_handler
= proc_dointvec
,
124 .procname
= "speed_limit_max",
125 .data
= &sysctl_speed_limit_max
,
126 .maxlen
= sizeof(int),
127 .mode
= S_IRUGO
|S_IWUSR
,
128 .proc_handler
= proc_dointvec
,
133 static ctl_table raid_dir_table
[] = {
137 .mode
= S_IRUGO
|S_IXUGO
,
143 static ctl_table raid_root_table
[] = {
148 .child
= raid_dir_table
,
153 static const struct block_device_operations md_fops
;
155 static int start_readonly
;
158 * like bio_clone, but with a local bio set
161 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
166 if (!mddev
|| !mddev
->bio_set
)
167 return bio_alloc(gfp_mask
, nr_iovecs
);
169 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
174 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
176 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
179 if (!mddev
|| !mddev
->bio_set
)
180 return bio_clone(bio
, gfp_mask
);
182 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
184 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
186 void md_trim_bio(struct bio
*bio
, int offset
, int size
)
188 /* 'bio' is a cloned bio which we need to trim to match
189 * the given offset and size.
190 * This requires adjusting bi_sector, bi_size, and bi_io_vec
193 struct bio_vec
*bvec
;
197 if (offset
== 0 && size
== bio
->bi_size
)
200 clear_bit(BIO_SEG_VALID
, &bio
->bi_flags
);
202 bio_advance(bio
, offset
<< 9);
206 /* avoid any complications with bi_idx being non-zero*/
208 memmove(bio
->bi_io_vec
, bio
->bi_io_vec
+bio
->bi_idx
,
209 (bio
->bi_vcnt
- bio
->bi_idx
) * sizeof(struct bio_vec
));
210 bio
->bi_vcnt
-= bio
->bi_idx
;
213 /* Make sure vcnt and last bv are not too big */
214 bio_for_each_segment(bvec
, bio
, i
) {
215 if (sofar
+ bvec
->bv_len
> size
)
216 bvec
->bv_len
= size
- sofar
;
217 if (bvec
->bv_len
== 0) {
221 sofar
+= bvec
->bv_len
;
224 EXPORT_SYMBOL_GPL(md_trim_bio
);
227 * We have a system wide 'event count' that is incremented
228 * on any 'interesting' event, and readers of /proc/mdstat
229 * can use 'poll' or 'select' to find out when the event
233 * start array, stop array, error, add device, remove device,
234 * start build, activate spare
236 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
237 static atomic_t md_event_count
;
238 void md_new_event(struct mddev
*mddev
)
240 atomic_inc(&md_event_count
);
241 wake_up(&md_event_waiters
);
243 EXPORT_SYMBOL_GPL(md_new_event
);
245 /* Alternate version that can be called from interrupts
246 * when calling sysfs_notify isn't needed.
248 static void md_new_event_inintr(struct mddev
*mddev
)
250 atomic_inc(&md_event_count
);
251 wake_up(&md_event_waiters
);
255 * Enables to iterate over all existing md arrays
256 * all_mddevs_lock protects this list.
258 static LIST_HEAD(all_mddevs
);
259 static DEFINE_SPINLOCK(all_mddevs_lock
);
263 * iterates through all used mddevs in the system.
264 * We take care to grab the all_mddevs_lock whenever navigating
265 * the list, and to always hold a refcount when unlocked.
266 * Any code which breaks out of this loop while own
267 * a reference to the current mddev and must mddev_put it.
269 #define for_each_mddev(_mddev,_tmp) \
271 for (({ spin_lock(&all_mddevs_lock); \
272 _tmp = all_mddevs.next; \
274 ({ if (_tmp != &all_mddevs) \
275 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
276 spin_unlock(&all_mddevs_lock); \
277 if (_mddev) mddev_put(_mddev); \
278 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
279 _tmp != &all_mddevs;}); \
280 ({ spin_lock(&all_mddevs_lock); \
281 _tmp = _tmp->next;}) \
285 /* Rather than calling directly into the personality make_request function,
286 * IO requests come here first so that we can check if the device is
287 * being suspended pending a reconfiguration.
288 * We hold a refcount over the call to ->make_request. By the time that
289 * call has finished, the bio has been linked into some internal structure
290 * and so is visible to ->quiesce(), so we don't need the refcount any more.
292 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
294 const int rw
= bio_data_dir(bio
);
295 struct mddev
*mddev
= q
->queuedata
;
297 unsigned int sectors
;
299 if (mddev
== NULL
|| mddev
->pers
== NULL
304 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
305 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
308 smp_rmb(); /* Ensure implications of 'active' are visible */
310 if (mddev
->suspended
) {
313 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
314 TASK_UNINTERRUPTIBLE
);
315 if (!mddev
->suspended
)
321 finish_wait(&mddev
->sb_wait
, &__wait
);
323 atomic_inc(&mddev
->active_io
);
327 * save the sectors now since our bio can
328 * go away inside make_request
330 sectors
= bio_sectors(bio
);
331 mddev
->pers
->make_request(mddev
, bio
);
333 cpu
= part_stat_lock();
334 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
335 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
338 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
339 wake_up(&mddev
->sb_wait
);
342 /* mddev_suspend makes sure no new requests are submitted
343 * to the device, and that any requests that have been submitted
344 * are completely handled.
345 * Once ->stop is called and completes, the module will be completely
348 void mddev_suspend(struct mddev
*mddev
)
350 BUG_ON(mddev
->suspended
);
351 mddev
->suspended
= 1;
353 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
354 mddev
->pers
->quiesce(mddev
, 1);
356 del_timer_sync(&mddev
->safemode_timer
);
358 EXPORT_SYMBOL_GPL(mddev_suspend
);
360 void mddev_resume(struct mddev
*mddev
)
362 mddev
->suspended
= 0;
363 wake_up(&mddev
->sb_wait
);
364 mddev
->pers
->quiesce(mddev
, 0);
366 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
367 md_wakeup_thread(mddev
->thread
);
368 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
370 EXPORT_SYMBOL_GPL(mddev_resume
);
372 int mddev_congested(struct mddev
*mddev
, int bits
)
374 return mddev
->suspended
;
376 EXPORT_SYMBOL(mddev_congested
);
379 * Generic flush handling for md
382 static void md_end_flush(struct bio
*bio
, int err
)
384 struct md_rdev
*rdev
= bio
->bi_private
;
385 struct mddev
*mddev
= rdev
->mddev
;
387 rdev_dec_pending(rdev
, mddev
);
389 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
390 /* The pre-request flush has finished */
391 queue_work(md_wq
, &mddev
->flush_work
);
396 static void md_submit_flush_data(struct work_struct
*ws
);
398 static void submit_flushes(struct work_struct
*ws
)
400 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
401 struct md_rdev
*rdev
;
403 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
404 atomic_set(&mddev
->flush_pending
, 1);
406 rdev_for_each_rcu(rdev
, mddev
)
407 if (rdev
->raid_disk
>= 0 &&
408 !test_bit(Faulty
, &rdev
->flags
)) {
409 /* Take two references, one is dropped
410 * when request finishes, one after
411 * we reclaim rcu_read_lock
414 atomic_inc(&rdev
->nr_pending
);
415 atomic_inc(&rdev
->nr_pending
);
417 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
418 bi
->bi_end_io
= md_end_flush
;
419 bi
->bi_private
= rdev
;
420 bi
->bi_bdev
= rdev
->bdev
;
421 atomic_inc(&mddev
->flush_pending
);
422 submit_bio(WRITE_FLUSH
, bi
);
424 rdev_dec_pending(rdev
, mddev
);
427 if (atomic_dec_and_test(&mddev
->flush_pending
))
428 queue_work(md_wq
, &mddev
->flush_work
);
431 static void md_submit_flush_data(struct work_struct
*ws
)
433 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
434 struct bio
*bio
= mddev
->flush_bio
;
436 if (bio
->bi_size
== 0)
437 /* an empty barrier - all done */
440 bio
->bi_rw
&= ~REQ_FLUSH
;
441 mddev
->pers
->make_request(mddev
, bio
);
444 mddev
->flush_bio
= NULL
;
445 wake_up(&mddev
->sb_wait
);
448 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
450 spin_lock_irq(&mddev
->write_lock
);
451 wait_event_lock_irq(mddev
->sb_wait
,
454 mddev
->flush_bio
= bio
;
455 spin_unlock_irq(&mddev
->write_lock
);
457 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
458 queue_work(md_wq
, &mddev
->flush_work
);
460 EXPORT_SYMBOL(md_flush_request
);
462 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
464 struct mddev
*mddev
= cb
->data
;
465 md_wakeup_thread(mddev
->thread
);
468 EXPORT_SYMBOL(md_unplug
);
470 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
472 atomic_inc(&mddev
->active
);
476 static void mddev_delayed_delete(struct work_struct
*ws
);
478 static void mddev_put(struct mddev
*mddev
)
480 struct bio_set
*bs
= NULL
;
482 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
484 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
485 mddev
->ctime
== 0 && !mddev
->hold_active
) {
486 /* Array is not configured at all, and not held active,
488 list_del_init(&mddev
->all_mddevs
);
490 mddev
->bio_set
= NULL
;
491 if (mddev
->gendisk
) {
492 /* We did a probe so need to clean up. Call
493 * queue_work inside the spinlock so that
494 * flush_workqueue() after mddev_find will
495 * succeed in waiting for the work to be done.
497 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
498 queue_work(md_misc_wq
, &mddev
->del_work
);
502 spin_unlock(&all_mddevs_lock
);
507 void mddev_init(struct mddev
*mddev
)
509 mutex_init(&mddev
->open_mutex
);
510 mutex_init(&mddev
->reconfig_mutex
);
511 mutex_init(&mddev
->bitmap_info
.mutex
);
512 INIT_LIST_HEAD(&mddev
->disks
);
513 INIT_LIST_HEAD(&mddev
->all_mddevs
);
514 init_timer(&mddev
->safemode_timer
);
515 atomic_set(&mddev
->active
, 1);
516 atomic_set(&mddev
->openers
, 0);
517 atomic_set(&mddev
->active_io
, 0);
518 spin_lock_init(&mddev
->write_lock
);
519 atomic_set(&mddev
->flush_pending
, 0);
520 init_waitqueue_head(&mddev
->sb_wait
);
521 init_waitqueue_head(&mddev
->recovery_wait
);
522 mddev
->reshape_position
= MaxSector
;
523 mddev
->reshape_backwards
= 0;
524 mddev
->resync_min
= 0;
525 mddev
->resync_max
= MaxSector
;
526 mddev
->level
= LEVEL_NONE
;
528 EXPORT_SYMBOL_GPL(mddev_init
);
530 static struct mddev
* mddev_find(dev_t unit
)
532 struct mddev
*mddev
, *new = NULL
;
534 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
535 unit
&= ~((1<<MdpMinorShift
)-1);
538 spin_lock(&all_mddevs_lock
);
541 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
542 if (mddev
->unit
== unit
) {
544 spin_unlock(&all_mddevs_lock
);
550 list_add(&new->all_mddevs
, &all_mddevs
);
551 spin_unlock(&all_mddevs_lock
);
552 new->hold_active
= UNTIL_IOCTL
;
556 /* find an unused unit number */
557 static int next_minor
= 512;
558 int start
= next_minor
;
562 dev
= MKDEV(MD_MAJOR
, next_minor
);
564 if (next_minor
> MINORMASK
)
566 if (next_minor
== start
) {
567 /* Oh dear, all in use. */
568 spin_unlock(&all_mddevs_lock
);
574 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
575 if (mddev
->unit
== dev
) {
581 new->md_minor
= MINOR(dev
);
582 new->hold_active
= UNTIL_STOP
;
583 list_add(&new->all_mddevs
, &all_mddevs
);
584 spin_unlock(&all_mddevs_lock
);
587 spin_unlock(&all_mddevs_lock
);
589 new = kzalloc(sizeof(*new), GFP_KERNEL
);
594 if (MAJOR(unit
) == MD_MAJOR
)
595 new->md_minor
= MINOR(unit
);
597 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
604 static inline int mddev_lock(struct mddev
* mddev
)
606 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
609 static inline int mddev_is_locked(struct mddev
*mddev
)
611 return mutex_is_locked(&mddev
->reconfig_mutex
);
614 static inline int mddev_trylock(struct mddev
* mddev
)
616 return mutex_trylock(&mddev
->reconfig_mutex
);
619 static struct attribute_group md_redundancy_group
;
621 static void mddev_unlock(struct mddev
* mddev
)
623 if (mddev
->to_remove
) {
624 /* These cannot be removed under reconfig_mutex as
625 * an access to the files will try to take reconfig_mutex
626 * while holding the file unremovable, which leads to
628 * So hold set sysfs_active while the remove in happeing,
629 * and anything else which might set ->to_remove or my
630 * otherwise change the sysfs namespace will fail with
631 * -EBUSY if sysfs_active is still set.
632 * We set sysfs_active under reconfig_mutex and elsewhere
633 * test it under the same mutex to ensure its correct value
636 struct attribute_group
*to_remove
= mddev
->to_remove
;
637 mddev
->to_remove
= NULL
;
638 mddev
->sysfs_active
= 1;
639 mutex_unlock(&mddev
->reconfig_mutex
);
641 if (mddev
->kobj
.sd
) {
642 if (to_remove
!= &md_redundancy_group
)
643 sysfs_remove_group(&mddev
->kobj
, to_remove
);
644 if (mddev
->pers
== NULL
||
645 mddev
->pers
->sync_request
== NULL
) {
646 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
647 if (mddev
->sysfs_action
)
648 sysfs_put(mddev
->sysfs_action
);
649 mddev
->sysfs_action
= NULL
;
652 mddev
->sysfs_active
= 0;
654 mutex_unlock(&mddev
->reconfig_mutex
);
656 /* As we've dropped the mutex we need a spinlock to
657 * make sure the thread doesn't disappear
659 spin_lock(&pers_lock
);
660 md_wakeup_thread(mddev
->thread
);
661 spin_unlock(&pers_lock
);
664 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
666 struct md_rdev
*rdev
;
668 rdev_for_each(rdev
, mddev
)
669 if (rdev
->desc_nr
== nr
)
675 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
677 struct md_rdev
*rdev
;
679 rdev_for_each_rcu(rdev
, mddev
)
680 if (rdev
->desc_nr
== nr
)
686 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
688 struct md_rdev
*rdev
;
690 rdev_for_each(rdev
, mddev
)
691 if (rdev
->bdev
->bd_dev
== dev
)
697 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
699 struct md_rdev
*rdev
;
701 rdev_for_each_rcu(rdev
, mddev
)
702 if (rdev
->bdev
->bd_dev
== dev
)
708 static struct md_personality
*find_pers(int level
, char *clevel
)
710 struct md_personality
*pers
;
711 list_for_each_entry(pers
, &pers_list
, list
) {
712 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
714 if (strcmp(pers
->name
, clevel
)==0)
720 /* return the offset of the super block in 512byte sectors */
721 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
723 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
724 return MD_NEW_SIZE_SECTORS(num_sectors
);
727 static int alloc_disk_sb(struct md_rdev
* rdev
)
732 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
733 if (!rdev
->sb_page
) {
734 printk(KERN_ALERT
"md: out of memory.\n");
741 void md_rdev_clear(struct md_rdev
*rdev
)
744 put_page(rdev
->sb_page
);
746 rdev
->sb_page
= NULL
;
751 put_page(rdev
->bb_page
);
752 rdev
->bb_page
= NULL
;
754 kfree(rdev
->badblocks
.page
);
755 rdev
->badblocks
.page
= NULL
;
757 EXPORT_SYMBOL_GPL(md_rdev_clear
);
759 static void super_written(struct bio
*bio
, int error
)
761 struct md_rdev
*rdev
= bio
->bi_private
;
762 struct mddev
*mddev
= rdev
->mddev
;
764 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
765 printk("md: super_written gets error=%d, uptodate=%d\n",
766 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
767 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
768 md_error(mddev
, rdev
);
771 if (atomic_dec_and_test(&mddev
->pending_writes
))
772 wake_up(&mddev
->sb_wait
);
776 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
777 sector_t sector
, int size
, struct page
*page
)
779 /* write first size bytes of page to sector of rdev
780 * Increment mddev->pending_writes before returning
781 * and decrement it on completion, waking up sb_wait
782 * if zero is reached.
783 * If an error occurred, call md_error
785 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
787 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
788 bio
->bi_sector
= sector
;
789 bio_add_page(bio
, page
, size
, 0);
790 bio
->bi_private
= rdev
;
791 bio
->bi_end_io
= super_written
;
793 atomic_inc(&mddev
->pending_writes
);
794 submit_bio(WRITE_FLUSH_FUA
, bio
);
797 void md_super_wait(struct mddev
*mddev
)
799 /* wait for all superblock writes that were scheduled to complete */
802 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
803 if (atomic_read(&mddev
->pending_writes
)==0)
807 finish_wait(&mddev
->sb_wait
, &wq
);
810 static void bi_complete(struct bio
*bio
, int error
)
812 complete((struct completion
*)bio
->bi_private
);
815 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
816 struct page
*page
, int rw
, bool metadata_op
)
818 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
819 struct completion event
;
824 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
825 rdev
->meta_bdev
: rdev
->bdev
;
827 bio
->bi_sector
= sector
+ rdev
->sb_start
;
828 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
829 (rdev
->mddev
->reshape_backwards
==
830 (sector
>= rdev
->mddev
->reshape_position
)))
831 bio
->bi_sector
= sector
+ rdev
->new_data_offset
;
833 bio
->bi_sector
= sector
+ rdev
->data_offset
;
834 bio_add_page(bio
, page
, size
, 0);
835 init_completion(&event
);
836 bio
->bi_private
= &event
;
837 bio
->bi_end_io
= bi_complete
;
839 wait_for_completion(&event
);
841 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
845 EXPORT_SYMBOL_GPL(sync_page_io
);
847 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
849 char b
[BDEVNAME_SIZE
];
850 if (!rdev
->sb_page
) {
858 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
864 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
865 bdevname(rdev
->bdev
,b
));
869 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
871 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
872 sb1
->set_uuid1
== sb2
->set_uuid1
&&
873 sb1
->set_uuid2
== sb2
->set_uuid2
&&
874 sb1
->set_uuid3
== sb2
->set_uuid3
;
877 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
880 mdp_super_t
*tmp1
, *tmp2
;
882 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
883 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
885 if (!tmp1
|| !tmp2
) {
887 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
895 * nr_disks is not constant
900 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
908 static u32
md_csum_fold(u32 csum
)
910 csum
= (csum
& 0xffff) + (csum
>> 16);
911 return (csum
& 0xffff) + (csum
>> 16);
914 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
917 u32
*sb32
= (u32
*)sb
;
919 unsigned int disk_csum
, csum
;
921 disk_csum
= sb
->sb_csum
;
924 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
926 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
930 /* This used to use csum_partial, which was wrong for several
931 * reasons including that different results are returned on
932 * different architectures. It isn't critical that we get exactly
933 * the same return value as before (we always csum_fold before
934 * testing, and that removes any differences). However as we
935 * know that csum_partial always returned a 16bit value on
936 * alphas, do a fold to maximise conformity to previous behaviour.
938 sb
->sb_csum
= md_csum_fold(disk_csum
);
940 sb
->sb_csum
= disk_csum
;
947 * Handle superblock details.
948 * We want to be able to handle multiple superblock formats
949 * so we have a common interface to them all, and an array of
950 * different handlers.
951 * We rely on user-space to write the initial superblock, and support
952 * reading and updating of superblocks.
953 * Interface methods are:
954 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
955 * loads and validates a superblock on dev.
956 * if refdev != NULL, compare superblocks on both devices
958 * 0 - dev has a superblock that is compatible with refdev
959 * 1 - dev has a superblock that is compatible and newer than refdev
960 * so dev should be used as the refdev in future
961 * -EINVAL superblock incompatible or invalid
962 * -othererror e.g. -EIO
964 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
965 * Verify that dev is acceptable into mddev.
966 * The first time, mddev->raid_disks will be 0, and data from
967 * dev should be merged in. Subsequent calls check that dev
968 * is new enough. Return 0 or -EINVAL
970 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
971 * Update the superblock for rdev with data in mddev
972 * This does not write to disc.
978 struct module
*owner
;
979 int (*load_super
)(struct md_rdev
*rdev
,
980 struct md_rdev
*refdev
,
982 int (*validate_super
)(struct mddev
*mddev
,
983 struct md_rdev
*rdev
);
984 void (*sync_super
)(struct mddev
*mddev
,
985 struct md_rdev
*rdev
);
986 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
987 sector_t num_sectors
);
988 int (*allow_new_offset
)(struct md_rdev
*rdev
,
989 unsigned long long new_offset
);
993 * Check that the given mddev has no bitmap.
995 * This function is called from the run method of all personalities that do not
996 * support bitmaps. It prints an error message and returns non-zero if mddev
997 * has a bitmap. Otherwise, it returns 0.
1000 int md_check_no_bitmap(struct mddev
*mddev
)
1002 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1004 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1005 mdname(mddev
), mddev
->pers
->name
);
1008 EXPORT_SYMBOL(md_check_no_bitmap
);
1011 * load_super for 0.90.0
1013 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1015 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1020 * Calculate the position of the superblock (512byte sectors),
1021 * it's at the end of the disk.
1023 * It also happens to be a multiple of 4Kb.
1025 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1027 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1028 if (ret
) return ret
;
1032 bdevname(rdev
->bdev
, b
);
1033 sb
= page_address(rdev
->sb_page
);
1035 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1036 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1041 if (sb
->major_version
!= 0 ||
1042 sb
->minor_version
< 90 ||
1043 sb
->minor_version
> 91) {
1044 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1045 sb
->major_version
, sb
->minor_version
,
1050 if (sb
->raid_disks
<= 0)
1053 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1054 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1059 rdev
->preferred_minor
= sb
->md_minor
;
1060 rdev
->data_offset
= 0;
1061 rdev
->new_data_offset
= 0;
1062 rdev
->sb_size
= MD_SB_BYTES
;
1063 rdev
->badblocks
.shift
= -1;
1065 if (sb
->level
== LEVEL_MULTIPATH
)
1068 rdev
->desc_nr
= sb
->this_disk
.number
;
1074 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1075 if (!uuid_equal(refsb
, sb
)) {
1076 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1077 b
, bdevname(refdev
->bdev
,b2
));
1080 if (!sb_equal(refsb
, sb
)) {
1081 printk(KERN_WARNING
"md: %s has same UUID"
1082 " but different superblock to %s\n",
1083 b
, bdevname(refdev
->bdev
, b2
));
1087 ev2
= md_event(refsb
);
1093 rdev
->sectors
= rdev
->sb_start
;
1094 /* Limit to 4TB as metadata cannot record more than that.
1095 * (not needed for Linear and RAID0 as metadata doesn't
1098 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1099 rdev
->sectors
= (2ULL << 32) - 2;
1101 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1102 /* "this cannot possibly happen" ... */
1110 * validate_super for 0.90.0
1112 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1115 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1116 __u64 ev1
= md_event(sb
);
1118 rdev
->raid_disk
= -1;
1119 clear_bit(Faulty
, &rdev
->flags
);
1120 clear_bit(In_sync
, &rdev
->flags
);
1121 clear_bit(WriteMostly
, &rdev
->flags
);
1123 if (mddev
->raid_disks
== 0) {
1124 mddev
->major_version
= 0;
1125 mddev
->minor_version
= sb
->minor_version
;
1126 mddev
->patch_version
= sb
->patch_version
;
1127 mddev
->external
= 0;
1128 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1129 mddev
->ctime
= sb
->ctime
;
1130 mddev
->utime
= sb
->utime
;
1131 mddev
->level
= sb
->level
;
1132 mddev
->clevel
[0] = 0;
1133 mddev
->layout
= sb
->layout
;
1134 mddev
->raid_disks
= sb
->raid_disks
;
1135 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1136 mddev
->events
= ev1
;
1137 mddev
->bitmap_info
.offset
= 0;
1138 mddev
->bitmap_info
.space
= 0;
1139 /* bitmap can use 60 K after the 4K superblocks */
1140 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1141 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1142 mddev
->reshape_backwards
= 0;
1144 if (mddev
->minor_version
>= 91) {
1145 mddev
->reshape_position
= sb
->reshape_position
;
1146 mddev
->delta_disks
= sb
->delta_disks
;
1147 mddev
->new_level
= sb
->new_level
;
1148 mddev
->new_layout
= sb
->new_layout
;
1149 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1150 if (mddev
->delta_disks
< 0)
1151 mddev
->reshape_backwards
= 1;
1153 mddev
->reshape_position
= MaxSector
;
1154 mddev
->delta_disks
= 0;
1155 mddev
->new_level
= mddev
->level
;
1156 mddev
->new_layout
= mddev
->layout
;
1157 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1160 if (sb
->state
& (1<<MD_SB_CLEAN
))
1161 mddev
->recovery_cp
= MaxSector
;
1163 if (sb
->events_hi
== sb
->cp_events_hi
&&
1164 sb
->events_lo
== sb
->cp_events_lo
) {
1165 mddev
->recovery_cp
= sb
->recovery_cp
;
1167 mddev
->recovery_cp
= 0;
1170 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1171 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1172 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1173 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1175 mddev
->max_disks
= MD_SB_DISKS
;
1177 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1178 mddev
->bitmap_info
.file
== NULL
) {
1179 mddev
->bitmap_info
.offset
=
1180 mddev
->bitmap_info
.default_offset
;
1181 mddev
->bitmap_info
.space
=
1182 mddev
->bitmap_info
.space
;
1185 } else if (mddev
->pers
== NULL
) {
1186 /* Insist on good event counter while assembling, except
1187 * for spares (which don't need an event count) */
1189 if (sb
->disks
[rdev
->desc_nr
].state
& (
1190 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1191 if (ev1
< mddev
->events
)
1193 } else if (mddev
->bitmap
) {
1194 /* if adding to array with a bitmap, then we can accept an
1195 * older device ... but not too old.
1197 if (ev1
< mddev
->bitmap
->events_cleared
)
1200 if (ev1
< mddev
->events
)
1201 /* just a hot-add of a new device, leave raid_disk at -1 */
1205 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1206 desc
= sb
->disks
+ rdev
->desc_nr
;
1208 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1209 set_bit(Faulty
, &rdev
->flags
);
1210 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1211 desc->raid_disk < mddev->raid_disks */) {
1212 set_bit(In_sync
, &rdev
->flags
);
1213 rdev
->raid_disk
= desc
->raid_disk
;
1214 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1215 /* active but not in sync implies recovery up to
1216 * reshape position. We don't know exactly where
1217 * that is, so set to zero for now */
1218 if (mddev
->minor_version
>= 91) {
1219 rdev
->recovery_offset
= 0;
1220 rdev
->raid_disk
= desc
->raid_disk
;
1223 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1224 set_bit(WriteMostly
, &rdev
->flags
);
1225 } else /* MULTIPATH are always insync */
1226 set_bit(In_sync
, &rdev
->flags
);
1231 * sync_super for 0.90.0
1233 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1236 struct md_rdev
*rdev2
;
1237 int next_spare
= mddev
->raid_disks
;
1240 /* make rdev->sb match mddev data..
1243 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1244 * 3/ any empty disks < next_spare become removed
1246 * disks[0] gets initialised to REMOVED because
1247 * we cannot be sure from other fields if it has
1248 * been initialised or not.
1251 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1253 rdev
->sb_size
= MD_SB_BYTES
;
1255 sb
= page_address(rdev
->sb_page
);
1257 memset(sb
, 0, sizeof(*sb
));
1259 sb
->md_magic
= MD_SB_MAGIC
;
1260 sb
->major_version
= mddev
->major_version
;
1261 sb
->patch_version
= mddev
->patch_version
;
1262 sb
->gvalid_words
= 0; /* ignored */
1263 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1264 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1265 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1266 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1268 sb
->ctime
= mddev
->ctime
;
1269 sb
->level
= mddev
->level
;
1270 sb
->size
= mddev
->dev_sectors
/ 2;
1271 sb
->raid_disks
= mddev
->raid_disks
;
1272 sb
->md_minor
= mddev
->md_minor
;
1273 sb
->not_persistent
= 0;
1274 sb
->utime
= mddev
->utime
;
1276 sb
->events_hi
= (mddev
->events
>>32);
1277 sb
->events_lo
= (u32
)mddev
->events
;
1279 if (mddev
->reshape_position
== MaxSector
)
1280 sb
->minor_version
= 90;
1282 sb
->minor_version
= 91;
1283 sb
->reshape_position
= mddev
->reshape_position
;
1284 sb
->new_level
= mddev
->new_level
;
1285 sb
->delta_disks
= mddev
->delta_disks
;
1286 sb
->new_layout
= mddev
->new_layout
;
1287 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1289 mddev
->minor_version
= sb
->minor_version
;
1292 sb
->recovery_cp
= mddev
->recovery_cp
;
1293 sb
->cp_events_hi
= (mddev
->events
>>32);
1294 sb
->cp_events_lo
= (u32
)mddev
->events
;
1295 if (mddev
->recovery_cp
== MaxSector
)
1296 sb
->state
= (1<< MD_SB_CLEAN
);
1298 sb
->recovery_cp
= 0;
1300 sb
->layout
= mddev
->layout
;
1301 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1303 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1304 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1306 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1307 rdev_for_each(rdev2
, mddev
) {
1310 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1312 if (rdev2
->raid_disk
>= 0 &&
1313 sb
->minor_version
>= 91)
1314 /* we have nowhere to store the recovery_offset,
1315 * but if it is not below the reshape_position,
1316 * we can piggy-back on that.
1319 if (rdev2
->raid_disk
< 0 ||
1320 test_bit(Faulty
, &rdev2
->flags
))
1323 desc_nr
= rdev2
->raid_disk
;
1325 desc_nr
= next_spare
++;
1326 rdev2
->desc_nr
= desc_nr
;
1327 d
= &sb
->disks
[rdev2
->desc_nr
];
1329 d
->number
= rdev2
->desc_nr
;
1330 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1331 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1333 d
->raid_disk
= rdev2
->raid_disk
;
1335 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1336 if (test_bit(Faulty
, &rdev2
->flags
))
1337 d
->state
= (1<<MD_DISK_FAULTY
);
1338 else if (is_active
) {
1339 d
->state
= (1<<MD_DISK_ACTIVE
);
1340 if (test_bit(In_sync
, &rdev2
->flags
))
1341 d
->state
|= (1<<MD_DISK_SYNC
);
1349 if (test_bit(WriteMostly
, &rdev2
->flags
))
1350 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1352 /* now set the "removed" and "faulty" bits on any missing devices */
1353 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1354 mdp_disk_t
*d
= &sb
->disks
[i
];
1355 if (d
->state
== 0 && d
->number
== 0) {
1358 d
->state
= (1<<MD_DISK_REMOVED
);
1359 d
->state
|= (1<<MD_DISK_FAULTY
);
1363 sb
->nr_disks
= nr_disks
;
1364 sb
->active_disks
= active
;
1365 sb
->working_disks
= working
;
1366 sb
->failed_disks
= failed
;
1367 sb
->spare_disks
= spare
;
1369 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1370 sb
->sb_csum
= calc_sb_csum(sb
);
1374 * rdev_size_change for 0.90.0
1376 static unsigned long long
1377 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1379 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1380 return 0; /* component must fit device */
1381 if (rdev
->mddev
->bitmap_info
.offset
)
1382 return 0; /* can't move bitmap */
1383 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1384 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1385 num_sectors
= rdev
->sb_start
;
1386 /* Limit to 4TB as metadata cannot record more than that.
1387 * 4TB == 2^32 KB, or 2*2^32 sectors.
1389 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1390 num_sectors
= (2ULL << 32) - 2;
1391 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1393 md_super_wait(rdev
->mddev
);
1398 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1400 /* non-zero offset changes not possible with v0.90 */
1401 return new_offset
== 0;
1405 * version 1 superblock
1408 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1412 unsigned long long newcsum
;
1413 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1414 __le32
*isuper
= (__le32
*)sb
;
1416 disk_csum
= sb
->sb_csum
;
1419 for (; size
>= 4; size
-= 4)
1420 newcsum
+= le32_to_cpu(*isuper
++);
1423 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1425 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1426 sb
->sb_csum
= disk_csum
;
1427 return cpu_to_le32(csum
);
1430 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1432 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1434 struct mdp_superblock_1
*sb
;
1438 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1442 * Calculate the position of the superblock in 512byte sectors.
1443 * It is always aligned to a 4K boundary and
1444 * depeding on minor_version, it can be:
1445 * 0: At least 8K, but less than 12K, from end of device
1446 * 1: At start of device
1447 * 2: 4K from start of device.
1449 switch(minor_version
) {
1451 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1453 sb_start
&= ~(sector_t
)(4*2-1);
1464 rdev
->sb_start
= sb_start
;
1466 /* superblock is rarely larger than 1K, but it can be larger,
1467 * and it is safe to read 4k, so we do that
1469 ret
= read_disk_sb(rdev
, 4096);
1470 if (ret
) return ret
;
1473 sb
= page_address(rdev
->sb_page
);
1475 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1476 sb
->major_version
!= cpu_to_le32(1) ||
1477 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1478 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1479 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1482 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1483 printk("md: invalid superblock checksum on %s\n",
1484 bdevname(rdev
->bdev
,b
));
1487 if (le64_to_cpu(sb
->data_size
) < 10) {
1488 printk("md: data_size too small on %s\n",
1489 bdevname(rdev
->bdev
,b
));
1494 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1495 /* Some padding is non-zero, might be a new feature */
1498 rdev
->preferred_minor
= 0xffff;
1499 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1500 rdev
->new_data_offset
= rdev
->data_offset
;
1501 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1502 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1503 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1504 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1506 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1507 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1508 if (rdev
->sb_size
& bmask
)
1509 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1512 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1515 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1518 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1521 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1523 if (!rdev
->bb_page
) {
1524 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1528 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1529 rdev
->badblocks
.count
== 0) {
1530 /* need to load the bad block list.
1531 * Currently we limit it to one page.
1537 int sectors
= le16_to_cpu(sb
->bblog_size
);
1538 if (sectors
> (PAGE_SIZE
/ 512))
1540 offset
= le32_to_cpu(sb
->bblog_offset
);
1543 bb_sector
= (long long)offset
;
1544 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1545 rdev
->bb_page
, READ
, true))
1547 bbp
= (u64
*)page_address(rdev
->bb_page
);
1548 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1549 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1550 u64 bb
= le64_to_cpu(*bbp
);
1551 int count
= bb
& (0x3ff);
1552 u64 sector
= bb
>> 10;
1553 sector
<<= sb
->bblog_shift
;
1554 count
<<= sb
->bblog_shift
;
1557 if (md_set_badblocks(&rdev
->badblocks
,
1558 sector
, count
, 1) == 0)
1561 } else if (sb
->bblog_offset
!= 0)
1562 rdev
->badblocks
.shift
= 0;
1568 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1570 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1571 sb
->level
!= refsb
->level
||
1572 sb
->layout
!= refsb
->layout
||
1573 sb
->chunksize
!= refsb
->chunksize
) {
1574 printk(KERN_WARNING
"md: %s has strangely different"
1575 " superblock to %s\n",
1576 bdevname(rdev
->bdev
,b
),
1577 bdevname(refdev
->bdev
,b2
));
1580 ev1
= le64_to_cpu(sb
->events
);
1581 ev2
= le64_to_cpu(refsb
->events
);
1588 if (minor_version
) {
1589 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1590 sectors
-= rdev
->data_offset
;
1592 sectors
= rdev
->sb_start
;
1593 if (sectors
< le64_to_cpu(sb
->data_size
))
1595 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1599 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1601 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1602 __u64 ev1
= le64_to_cpu(sb
->events
);
1604 rdev
->raid_disk
= -1;
1605 clear_bit(Faulty
, &rdev
->flags
);
1606 clear_bit(In_sync
, &rdev
->flags
);
1607 clear_bit(WriteMostly
, &rdev
->flags
);
1609 if (mddev
->raid_disks
== 0) {
1610 mddev
->major_version
= 1;
1611 mddev
->patch_version
= 0;
1612 mddev
->external
= 0;
1613 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1614 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1615 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1616 mddev
->level
= le32_to_cpu(sb
->level
);
1617 mddev
->clevel
[0] = 0;
1618 mddev
->layout
= le32_to_cpu(sb
->layout
);
1619 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1620 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1621 mddev
->events
= ev1
;
1622 mddev
->bitmap_info
.offset
= 0;
1623 mddev
->bitmap_info
.space
= 0;
1624 /* Default location for bitmap is 1K after superblock
1625 * using 3K - total of 4K
1627 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1628 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1629 mddev
->reshape_backwards
= 0;
1631 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1632 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1634 mddev
->max_disks
= (4096-256)/2;
1636 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1637 mddev
->bitmap_info
.file
== NULL
) {
1638 mddev
->bitmap_info
.offset
=
1639 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1640 /* Metadata doesn't record how much space is available.
1641 * For 1.0, we assume we can use up to the superblock
1642 * if before, else to 4K beyond superblock.
1643 * For others, assume no change is possible.
1645 if (mddev
->minor_version
> 0)
1646 mddev
->bitmap_info
.space
= 0;
1647 else if (mddev
->bitmap_info
.offset
> 0)
1648 mddev
->bitmap_info
.space
=
1649 8 - mddev
->bitmap_info
.offset
;
1651 mddev
->bitmap_info
.space
=
1652 -mddev
->bitmap_info
.offset
;
1655 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1656 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1657 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1658 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1659 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1660 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1661 if (mddev
->delta_disks
< 0 ||
1662 (mddev
->delta_disks
== 0 &&
1663 (le32_to_cpu(sb
->feature_map
)
1664 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1665 mddev
->reshape_backwards
= 1;
1667 mddev
->reshape_position
= MaxSector
;
1668 mddev
->delta_disks
= 0;
1669 mddev
->new_level
= mddev
->level
;
1670 mddev
->new_layout
= mddev
->layout
;
1671 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1674 } else if (mddev
->pers
== NULL
) {
1675 /* Insist of good event counter while assembling, except for
1676 * spares (which don't need an event count) */
1678 if (rdev
->desc_nr
>= 0 &&
1679 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1680 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1681 if (ev1
< mddev
->events
)
1683 } else if (mddev
->bitmap
) {
1684 /* If adding to array with a bitmap, then we can accept an
1685 * older device, but not too old.
1687 if (ev1
< mddev
->bitmap
->events_cleared
)
1690 if (ev1
< mddev
->events
)
1691 /* just a hot-add of a new device, leave raid_disk at -1 */
1694 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1696 if (rdev
->desc_nr
< 0 ||
1697 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1701 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1703 case 0xffff: /* spare */
1705 case 0xfffe: /* faulty */
1706 set_bit(Faulty
, &rdev
->flags
);
1709 if ((le32_to_cpu(sb
->feature_map
) &
1710 MD_FEATURE_RECOVERY_OFFSET
))
1711 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1713 set_bit(In_sync
, &rdev
->flags
);
1714 rdev
->raid_disk
= role
;
1717 if (sb
->devflags
& WriteMostly1
)
1718 set_bit(WriteMostly
, &rdev
->flags
);
1719 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1720 set_bit(Replacement
, &rdev
->flags
);
1721 } else /* MULTIPATH are always insync */
1722 set_bit(In_sync
, &rdev
->flags
);
1727 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1729 struct mdp_superblock_1
*sb
;
1730 struct md_rdev
*rdev2
;
1732 /* make rdev->sb match mddev and rdev data. */
1734 sb
= page_address(rdev
->sb_page
);
1736 sb
->feature_map
= 0;
1738 sb
->recovery_offset
= cpu_to_le64(0);
1739 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1741 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1742 sb
->events
= cpu_to_le64(mddev
->events
);
1744 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1746 sb
->resync_offset
= cpu_to_le64(0);
1748 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1750 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1751 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1752 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1753 sb
->level
= cpu_to_le32(mddev
->level
);
1754 sb
->layout
= cpu_to_le32(mddev
->layout
);
1756 if (test_bit(WriteMostly
, &rdev
->flags
))
1757 sb
->devflags
|= WriteMostly1
;
1759 sb
->devflags
&= ~WriteMostly1
;
1760 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1761 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1763 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1764 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1765 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1768 if (rdev
->raid_disk
>= 0 &&
1769 !test_bit(In_sync
, &rdev
->flags
)) {
1771 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1772 sb
->recovery_offset
=
1773 cpu_to_le64(rdev
->recovery_offset
);
1775 if (test_bit(Replacement
, &rdev
->flags
))
1777 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1779 if (mddev
->reshape_position
!= MaxSector
) {
1780 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1781 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1782 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1783 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1784 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1785 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1786 if (mddev
->delta_disks
== 0 &&
1787 mddev
->reshape_backwards
)
1789 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1790 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1792 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1793 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1794 - rdev
->data_offset
));
1798 if (rdev
->badblocks
.count
== 0)
1799 /* Nothing to do for bad blocks*/ ;
1800 else if (sb
->bblog_offset
== 0)
1801 /* Cannot record bad blocks on this device */
1802 md_error(mddev
, rdev
);
1804 struct badblocks
*bb
= &rdev
->badblocks
;
1805 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1807 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1812 seq
= read_seqbegin(&bb
->lock
);
1814 memset(bbp
, 0xff, PAGE_SIZE
);
1816 for (i
= 0 ; i
< bb
->count
; i
++) {
1817 u64 internal_bb
= p
[i
];
1818 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1819 | BB_LEN(internal_bb
));
1820 bbp
[i
] = cpu_to_le64(store_bb
);
1823 if (read_seqretry(&bb
->lock
, seq
))
1826 bb
->sector
= (rdev
->sb_start
+
1827 (int)le32_to_cpu(sb
->bblog_offset
));
1828 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1833 rdev_for_each(rdev2
, mddev
)
1834 if (rdev2
->desc_nr
+1 > max_dev
)
1835 max_dev
= rdev2
->desc_nr
+1;
1837 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1839 sb
->max_dev
= cpu_to_le32(max_dev
);
1840 rdev
->sb_size
= max_dev
* 2 + 256;
1841 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1842 if (rdev
->sb_size
& bmask
)
1843 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1845 max_dev
= le32_to_cpu(sb
->max_dev
);
1847 for (i
=0; i
<max_dev
;i
++)
1848 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1850 rdev_for_each(rdev2
, mddev
) {
1852 if (test_bit(Faulty
, &rdev2
->flags
))
1853 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1854 else if (test_bit(In_sync
, &rdev2
->flags
))
1855 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1856 else if (rdev2
->raid_disk
>= 0)
1857 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1859 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1862 sb
->sb_csum
= calc_sb_1_csum(sb
);
1865 static unsigned long long
1866 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1868 struct mdp_superblock_1
*sb
;
1869 sector_t max_sectors
;
1870 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1871 return 0; /* component must fit device */
1872 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1873 return 0; /* too confusing */
1874 if (rdev
->sb_start
< rdev
->data_offset
) {
1875 /* minor versions 1 and 2; superblock before data */
1876 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1877 max_sectors
-= rdev
->data_offset
;
1878 if (!num_sectors
|| num_sectors
> max_sectors
)
1879 num_sectors
= max_sectors
;
1880 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1881 /* minor version 0 with bitmap we can't move */
1884 /* minor version 0; superblock after data */
1886 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1887 sb_start
&= ~(sector_t
)(4*2 - 1);
1888 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1889 if (!num_sectors
|| num_sectors
> max_sectors
)
1890 num_sectors
= max_sectors
;
1891 rdev
->sb_start
= sb_start
;
1893 sb
= page_address(rdev
->sb_page
);
1894 sb
->data_size
= cpu_to_le64(num_sectors
);
1895 sb
->super_offset
= rdev
->sb_start
;
1896 sb
->sb_csum
= calc_sb_1_csum(sb
);
1897 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1899 md_super_wait(rdev
->mddev
);
1905 super_1_allow_new_offset(struct md_rdev
*rdev
,
1906 unsigned long long new_offset
)
1908 /* All necessary checks on new >= old have been done */
1909 struct bitmap
*bitmap
;
1910 if (new_offset
>= rdev
->data_offset
)
1913 /* with 1.0 metadata, there is no metadata to tread on
1914 * so we can always move back */
1915 if (rdev
->mddev
->minor_version
== 0)
1918 /* otherwise we must be sure not to step on
1919 * any metadata, so stay:
1920 * 36K beyond start of superblock
1921 * beyond end of badblocks
1922 * beyond write-intent bitmap
1924 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1926 bitmap
= rdev
->mddev
->bitmap
;
1927 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1928 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1929 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1931 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1937 static struct super_type super_types
[] = {
1940 .owner
= THIS_MODULE
,
1941 .load_super
= super_90_load
,
1942 .validate_super
= super_90_validate
,
1943 .sync_super
= super_90_sync
,
1944 .rdev_size_change
= super_90_rdev_size_change
,
1945 .allow_new_offset
= super_90_allow_new_offset
,
1949 .owner
= THIS_MODULE
,
1950 .load_super
= super_1_load
,
1951 .validate_super
= super_1_validate
,
1952 .sync_super
= super_1_sync
,
1953 .rdev_size_change
= super_1_rdev_size_change
,
1954 .allow_new_offset
= super_1_allow_new_offset
,
1958 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1960 if (mddev
->sync_super
) {
1961 mddev
->sync_super(mddev
, rdev
);
1965 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1967 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1970 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1972 struct md_rdev
*rdev
, *rdev2
;
1975 rdev_for_each_rcu(rdev
, mddev1
)
1976 rdev_for_each_rcu(rdev2
, mddev2
)
1977 if (rdev
->bdev
->bd_contains
==
1978 rdev2
->bdev
->bd_contains
) {
1986 static LIST_HEAD(pending_raid_disks
);
1989 * Try to register data integrity profile for an mddev
1991 * This is called when an array is started and after a disk has been kicked
1992 * from the array. It only succeeds if all working and active component devices
1993 * are integrity capable with matching profiles.
1995 int md_integrity_register(struct mddev
*mddev
)
1997 struct md_rdev
*rdev
, *reference
= NULL
;
1999 if (list_empty(&mddev
->disks
))
2000 return 0; /* nothing to do */
2001 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2002 return 0; /* shouldn't register, or already is */
2003 rdev_for_each(rdev
, mddev
) {
2004 /* skip spares and non-functional disks */
2005 if (test_bit(Faulty
, &rdev
->flags
))
2007 if (rdev
->raid_disk
< 0)
2010 /* Use the first rdev as the reference */
2014 /* does this rdev's profile match the reference profile? */
2015 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2016 rdev
->bdev
->bd_disk
) < 0)
2019 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2022 * All component devices are integrity capable and have matching
2023 * profiles, register the common profile for the md device.
2025 if (blk_integrity_register(mddev
->gendisk
,
2026 bdev_get_integrity(reference
->bdev
)) != 0) {
2027 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2031 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2032 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2033 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2039 EXPORT_SYMBOL(md_integrity_register
);
2041 /* Disable data integrity if non-capable/non-matching disk is being added */
2042 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2044 struct blk_integrity
*bi_rdev
;
2045 struct blk_integrity
*bi_mddev
;
2047 if (!mddev
->gendisk
)
2050 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2051 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2053 if (!bi_mddev
) /* nothing to do */
2055 if (rdev
->raid_disk
< 0) /* skip spares */
2057 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2058 rdev
->bdev
->bd_disk
) >= 0)
2060 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2061 blk_integrity_unregister(mddev
->gendisk
);
2063 EXPORT_SYMBOL(md_integrity_add_rdev
);
2065 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2067 char b
[BDEVNAME_SIZE
];
2077 /* prevent duplicates */
2078 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2081 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2082 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2083 rdev
->sectors
< mddev
->dev_sectors
)) {
2085 /* Cannot change size, so fail
2086 * If mddev->level <= 0, then we don't care
2087 * about aligning sizes (e.g. linear)
2089 if (mddev
->level
> 0)
2092 mddev
->dev_sectors
= rdev
->sectors
;
2095 /* Verify rdev->desc_nr is unique.
2096 * If it is -1, assign a free number, else
2097 * check number is not in use
2099 if (rdev
->desc_nr
< 0) {
2101 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2102 while (find_rdev_nr(mddev
, choice
))
2104 rdev
->desc_nr
= choice
;
2106 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2109 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2110 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2111 mdname(mddev
), mddev
->max_disks
);
2114 bdevname(rdev
->bdev
,b
);
2115 while ( (s
=strchr(b
, '/')) != NULL
)
2118 rdev
->mddev
= mddev
;
2119 printk(KERN_INFO
"md: bind<%s>\n", b
);
2121 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2124 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2125 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2126 /* failure here is OK */;
2127 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2129 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2130 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2132 /* May as well allow recovery to be retried once */
2133 mddev
->recovery_disabled
++;
2138 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2143 static void md_delayed_delete(struct work_struct
*ws
)
2145 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2146 kobject_del(&rdev
->kobj
);
2147 kobject_put(&rdev
->kobj
);
2150 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2152 char b
[BDEVNAME_SIZE
];
2157 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2158 list_del_rcu(&rdev
->same_set
);
2159 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2161 sysfs_remove_link(&rdev
->kobj
, "block");
2162 sysfs_put(rdev
->sysfs_state
);
2163 rdev
->sysfs_state
= NULL
;
2164 rdev
->badblocks
.count
= 0;
2165 /* We need to delay this, otherwise we can deadlock when
2166 * writing to 'remove' to "dev/state". We also need
2167 * to delay it due to rcu usage.
2170 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2171 kobject_get(&rdev
->kobj
);
2172 queue_work(md_misc_wq
, &rdev
->del_work
);
2176 * prevent the device from being mounted, repartitioned or
2177 * otherwise reused by a RAID array (or any other kernel
2178 * subsystem), by bd_claiming the device.
2180 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2183 struct block_device
*bdev
;
2184 char b
[BDEVNAME_SIZE
];
2186 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2187 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2189 printk(KERN_ERR
"md: could not open %s.\n",
2190 __bdevname(dev
, b
));
2191 return PTR_ERR(bdev
);
2197 static void unlock_rdev(struct md_rdev
*rdev
)
2199 struct block_device
*bdev
= rdev
->bdev
;
2203 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2206 void md_autodetect_dev(dev_t dev
);
2208 static void export_rdev(struct md_rdev
* rdev
)
2210 char b
[BDEVNAME_SIZE
];
2211 printk(KERN_INFO
"md: export_rdev(%s)\n",
2212 bdevname(rdev
->bdev
,b
));
2215 md_rdev_clear(rdev
);
2217 if (test_bit(AutoDetected
, &rdev
->flags
))
2218 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2221 kobject_put(&rdev
->kobj
);
2224 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2226 unbind_rdev_from_array(rdev
);
2230 static void export_array(struct mddev
*mddev
)
2232 struct md_rdev
*rdev
, *tmp
;
2234 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2239 kick_rdev_from_array(rdev
);
2241 if (!list_empty(&mddev
->disks
))
2243 mddev
->raid_disks
= 0;
2244 mddev
->major_version
= 0;
2247 static void print_desc(mdp_disk_t
*desc
)
2249 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2250 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2253 static void print_sb_90(mdp_super_t
*sb
)
2258 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2259 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2260 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2262 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2263 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2264 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2265 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2266 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2267 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2268 sb
->failed_disks
, sb
->spare_disks
,
2269 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2272 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2275 desc
= sb
->disks
+ i
;
2276 if (desc
->number
|| desc
->major
|| desc
->minor
||
2277 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2278 printk(" D %2d: ", i
);
2282 printk(KERN_INFO
"md: THIS: ");
2283 print_desc(&sb
->this_disk
);
2286 static void print_sb_1(struct mdp_superblock_1
*sb
)
2290 uuid
= sb
->set_uuid
;
2292 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2293 "md: Name: \"%s\" CT:%llu\n",
2294 le32_to_cpu(sb
->major_version
),
2295 le32_to_cpu(sb
->feature_map
),
2298 (unsigned long long)le64_to_cpu(sb
->ctime
)
2299 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2301 uuid
= sb
->device_uuid
;
2303 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2305 "md: Dev:%08x UUID: %pU\n"
2306 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2307 "md: (MaxDev:%u) \n",
2308 le32_to_cpu(sb
->level
),
2309 (unsigned long long)le64_to_cpu(sb
->size
),
2310 le32_to_cpu(sb
->raid_disks
),
2311 le32_to_cpu(sb
->layout
),
2312 le32_to_cpu(sb
->chunksize
),
2313 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2314 (unsigned long long)le64_to_cpu(sb
->data_size
),
2315 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2316 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2317 le32_to_cpu(sb
->dev_number
),
2320 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2321 (unsigned long long)le64_to_cpu(sb
->events
),
2322 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2323 le32_to_cpu(sb
->sb_csum
),
2324 le32_to_cpu(sb
->max_dev
)
2328 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2330 char b
[BDEVNAME_SIZE
];
2331 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2332 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2333 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2335 if (rdev
->sb_loaded
) {
2336 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2337 switch (major_version
) {
2339 print_sb_90(page_address(rdev
->sb_page
));
2342 print_sb_1(page_address(rdev
->sb_page
));
2346 printk(KERN_INFO
"md: no rdev superblock!\n");
2349 static void md_print_devices(void)
2351 struct list_head
*tmp
;
2352 struct md_rdev
*rdev
;
2353 struct mddev
*mddev
;
2354 char b
[BDEVNAME_SIZE
];
2357 printk("md: **********************************\n");
2358 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2359 printk("md: **********************************\n");
2360 for_each_mddev(mddev
, tmp
) {
2363 bitmap_print_sb(mddev
->bitmap
);
2365 printk("%s: ", mdname(mddev
));
2366 rdev_for_each(rdev
, mddev
)
2367 printk("<%s>", bdevname(rdev
->bdev
,b
));
2370 rdev_for_each(rdev
, mddev
)
2371 print_rdev(rdev
, mddev
->major_version
);
2373 printk("md: **********************************\n");
2378 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2380 /* Update each superblock (in-memory image), but
2381 * if we are allowed to, skip spares which already
2382 * have the right event counter, or have one earlier
2383 * (which would mean they aren't being marked as dirty
2384 * with the rest of the array)
2386 struct md_rdev
*rdev
;
2387 rdev_for_each(rdev
, mddev
) {
2388 if (rdev
->sb_events
== mddev
->events
||
2390 rdev
->raid_disk
< 0 &&
2391 rdev
->sb_events
+1 == mddev
->events
)) {
2392 /* Don't update this superblock */
2393 rdev
->sb_loaded
= 2;
2395 sync_super(mddev
, rdev
);
2396 rdev
->sb_loaded
= 1;
2401 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2403 struct md_rdev
*rdev
;
2406 int any_badblocks_changed
= 0;
2410 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2414 /* First make sure individual recovery_offsets are correct */
2415 rdev_for_each(rdev
, mddev
) {
2416 if (rdev
->raid_disk
>= 0 &&
2417 mddev
->delta_disks
>= 0 &&
2418 !test_bit(In_sync
, &rdev
->flags
) &&
2419 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2420 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2423 if (!mddev
->persistent
) {
2424 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2425 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2426 if (!mddev
->external
) {
2427 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2428 rdev_for_each(rdev
, mddev
) {
2429 if (rdev
->badblocks
.changed
) {
2430 rdev
->badblocks
.changed
= 0;
2431 md_ack_all_badblocks(&rdev
->badblocks
);
2432 md_error(mddev
, rdev
);
2434 clear_bit(Blocked
, &rdev
->flags
);
2435 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2436 wake_up(&rdev
->blocked_wait
);
2439 wake_up(&mddev
->sb_wait
);
2443 spin_lock_irq(&mddev
->write_lock
);
2445 mddev
->utime
= get_seconds();
2447 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2449 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2450 /* just a clean<-> dirty transition, possibly leave spares alone,
2451 * though if events isn't the right even/odd, we will have to do
2457 if (mddev
->degraded
)
2458 /* If the array is degraded, then skipping spares is both
2459 * dangerous and fairly pointless.
2460 * Dangerous because a device that was removed from the array
2461 * might have a event_count that still looks up-to-date,
2462 * so it can be re-added without a resync.
2463 * Pointless because if there are any spares to skip,
2464 * then a recovery will happen and soon that array won't
2465 * be degraded any more and the spare can go back to sleep then.
2469 sync_req
= mddev
->in_sync
;
2471 /* If this is just a dirty<->clean transition, and the array is clean
2472 * and 'events' is odd, we can roll back to the previous clean state */
2474 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2475 && mddev
->can_decrease_events
2476 && mddev
->events
!= 1) {
2478 mddev
->can_decrease_events
= 0;
2480 /* otherwise we have to go forward and ... */
2482 mddev
->can_decrease_events
= nospares
;
2485 if (!mddev
->events
) {
2487 * oops, this 64-bit counter should never wrap.
2488 * Either we are in around ~1 trillion A.C., assuming
2489 * 1 reboot per second, or we have a bug:
2495 rdev_for_each(rdev
, mddev
) {
2496 if (rdev
->badblocks
.changed
)
2497 any_badblocks_changed
++;
2498 if (test_bit(Faulty
, &rdev
->flags
))
2499 set_bit(FaultRecorded
, &rdev
->flags
);
2502 sync_sbs(mddev
, nospares
);
2503 spin_unlock_irq(&mddev
->write_lock
);
2505 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2506 mdname(mddev
), mddev
->in_sync
);
2508 bitmap_update_sb(mddev
->bitmap
);
2509 rdev_for_each(rdev
, mddev
) {
2510 char b
[BDEVNAME_SIZE
];
2512 if (rdev
->sb_loaded
!= 1)
2513 continue; /* no noise on spare devices */
2515 if (!test_bit(Faulty
, &rdev
->flags
) &&
2516 rdev
->saved_raid_disk
== -1) {
2517 md_super_write(mddev
,rdev
,
2518 rdev
->sb_start
, rdev
->sb_size
,
2520 pr_debug("md: (write) %s's sb offset: %llu\n",
2521 bdevname(rdev
->bdev
, b
),
2522 (unsigned long long)rdev
->sb_start
);
2523 rdev
->sb_events
= mddev
->events
;
2524 if (rdev
->badblocks
.size
) {
2525 md_super_write(mddev
, rdev
,
2526 rdev
->badblocks
.sector
,
2527 rdev
->badblocks
.size
<< 9,
2529 rdev
->badblocks
.size
= 0;
2532 } else if (test_bit(Faulty
, &rdev
->flags
))
2533 pr_debug("md: %s (skipping faulty)\n",
2534 bdevname(rdev
->bdev
, b
));
2536 pr_debug("(skipping incremental s/r ");
2538 if (mddev
->level
== LEVEL_MULTIPATH
)
2539 /* only need to write one superblock... */
2542 md_super_wait(mddev
);
2543 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2545 spin_lock_irq(&mddev
->write_lock
);
2546 if (mddev
->in_sync
!= sync_req
||
2547 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2548 /* have to write it out again */
2549 spin_unlock_irq(&mddev
->write_lock
);
2552 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2553 spin_unlock_irq(&mddev
->write_lock
);
2554 wake_up(&mddev
->sb_wait
);
2555 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2556 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2558 rdev_for_each(rdev
, mddev
) {
2559 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2560 clear_bit(Blocked
, &rdev
->flags
);
2562 if (any_badblocks_changed
)
2563 md_ack_all_badblocks(&rdev
->badblocks
);
2564 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2565 wake_up(&rdev
->blocked_wait
);
2569 /* words written to sysfs files may, or may not, be \n terminated.
2570 * We want to accept with case. For this we use cmd_match.
2572 static int cmd_match(const char *cmd
, const char *str
)
2574 /* See if cmd, written into a sysfs file, matches
2575 * str. They must either be the same, or cmd can
2576 * have a trailing newline
2578 while (*cmd
&& *str
&& *cmd
== *str
) {
2589 struct rdev_sysfs_entry
{
2590 struct attribute attr
;
2591 ssize_t (*show
)(struct md_rdev
*, char *);
2592 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2596 state_show(struct md_rdev
*rdev
, char *page
)
2601 if (test_bit(Faulty
, &rdev
->flags
) ||
2602 rdev
->badblocks
.unacked_exist
) {
2603 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2606 if (test_bit(In_sync
, &rdev
->flags
)) {
2607 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2610 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2611 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2614 if (test_bit(Blocked
, &rdev
->flags
) ||
2615 (rdev
->badblocks
.unacked_exist
2616 && !test_bit(Faulty
, &rdev
->flags
))) {
2617 len
+= sprintf(page
+len
, "%sblocked", sep
);
2620 if (!test_bit(Faulty
, &rdev
->flags
) &&
2621 !test_bit(In_sync
, &rdev
->flags
)) {
2622 len
+= sprintf(page
+len
, "%sspare", sep
);
2625 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2626 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2629 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2630 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2633 if (test_bit(Replacement
, &rdev
->flags
)) {
2634 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2638 return len
+sprintf(page
+len
, "\n");
2642 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2645 * faulty - simulates an error
2646 * remove - disconnects the device
2647 * writemostly - sets write_mostly
2648 * -writemostly - clears write_mostly
2649 * blocked - sets the Blocked flags
2650 * -blocked - clears the Blocked and possibly simulates an error
2651 * insync - sets Insync providing device isn't active
2652 * write_error - sets WriteErrorSeen
2653 * -write_error - clears WriteErrorSeen
2656 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2657 md_error(rdev
->mddev
, rdev
);
2658 if (test_bit(Faulty
, &rdev
->flags
))
2662 } else if (cmd_match(buf
, "remove")) {
2663 if (rdev
->raid_disk
>= 0)
2666 struct mddev
*mddev
= rdev
->mddev
;
2667 kick_rdev_from_array(rdev
);
2669 md_update_sb(mddev
, 1);
2670 md_new_event(mddev
);
2673 } else if (cmd_match(buf
, "writemostly")) {
2674 set_bit(WriteMostly
, &rdev
->flags
);
2676 } else if (cmd_match(buf
, "-writemostly")) {
2677 clear_bit(WriteMostly
, &rdev
->flags
);
2679 } else if (cmd_match(buf
, "blocked")) {
2680 set_bit(Blocked
, &rdev
->flags
);
2682 } else if (cmd_match(buf
, "-blocked")) {
2683 if (!test_bit(Faulty
, &rdev
->flags
) &&
2684 rdev
->badblocks
.unacked_exist
) {
2685 /* metadata handler doesn't understand badblocks,
2686 * so we need to fail the device
2688 md_error(rdev
->mddev
, rdev
);
2690 clear_bit(Blocked
, &rdev
->flags
);
2691 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2692 wake_up(&rdev
->blocked_wait
);
2693 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2694 md_wakeup_thread(rdev
->mddev
->thread
);
2697 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2698 set_bit(In_sync
, &rdev
->flags
);
2700 } else if (cmd_match(buf
, "write_error")) {
2701 set_bit(WriteErrorSeen
, &rdev
->flags
);
2703 } else if (cmd_match(buf
, "-write_error")) {
2704 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2706 } else if (cmd_match(buf
, "want_replacement")) {
2707 /* Any non-spare device that is not a replacement can
2708 * become want_replacement at any time, but we then need to
2709 * check if recovery is needed.
2711 if (rdev
->raid_disk
>= 0 &&
2712 !test_bit(Replacement
, &rdev
->flags
))
2713 set_bit(WantReplacement
, &rdev
->flags
);
2714 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2715 md_wakeup_thread(rdev
->mddev
->thread
);
2717 } else if (cmd_match(buf
, "-want_replacement")) {
2718 /* Clearing 'want_replacement' is always allowed.
2719 * Once replacements starts it is too late though.
2722 clear_bit(WantReplacement
, &rdev
->flags
);
2723 } else if (cmd_match(buf
, "replacement")) {
2724 /* Can only set a device as a replacement when array has not
2725 * yet been started. Once running, replacement is automatic
2726 * from spares, or by assigning 'slot'.
2728 if (rdev
->mddev
->pers
)
2731 set_bit(Replacement
, &rdev
->flags
);
2734 } else if (cmd_match(buf
, "-replacement")) {
2735 /* Similarly, can only clear Replacement before start */
2736 if (rdev
->mddev
->pers
)
2739 clear_bit(Replacement
, &rdev
->flags
);
2744 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2745 return err
? err
: len
;
2747 static struct rdev_sysfs_entry rdev_state
=
2748 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2751 errors_show(struct md_rdev
*rdev
, char *page
)
2753 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2757 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2760 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2761 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2762 atomic_set(&rdev
->corrected_errors
, n
);
2767 static struct rdev_sysfs_entry rdev_errors
=
2768 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2771 slot_show(struct md_rdev
*rdev
, char *page
)
2773 if (rdev
->raid_disk
< 0)
2774 return sprintf(page
, "none\n");
2776 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2780 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2784 int slot
= simple_strtoul(buf
, &e
, 10);
2785 if (strncmp(buf
, "none", 4)==0)
2787 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2789 if (rdev
->mddev
->pers
&& slot
== -1) {
2790 /* Setting 'slot' on an active array requires also
2791 * updating the 'rd%d' link, and communicating
2792 * with the personality with ->hot_*_disk.
2793 * For now we only support removing
2794 * failed/spare devices. This normally happens automatically,
2795 * but not when the metadata is externally managed.
2797 if (rdev
->raid_disk
== -1)
2799 /* personality does all needed checks */
2800 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2802 clear_bit(Blocked
, &rdev
->flags
);
2803 remove_and_add_spares(rdev
->mddev
, rdev
);
2804 if (rdev
->raid_disk
>= 0)
2806 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2807 md_wakeup_thread(rdev
->mddev
->thread
);
2808 } else if (rdev
->mddev
->pers
) {
2809 /* Activating a spare .. or possibly reactivating
2810 * if we ever get bitmaps working here.
2813 if (rdev
->raid_disk
!= -1)
2816 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2819 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2822 if (slot
>= rdev
->mddev
->raid_disks
&&
2823 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2826 rdev
->raid_disk
= slot
;
2827 if (test_bit(In_sync
, &rdev
->flags
))
2828 rdev
->saved_raid_disk
= slot
;
2830 rdev
->saved_raid_disk
= -1;
2831 clear_bit(In_sync
, &rdev
->flags
);
2832 err
= rdev
->mddev
->pers
->
2833 hot_add_disk(rdev
->mddev
, rdev
);
2835 rdev
->raid_disk
= -1;
2838 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2839 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2840 /* failure here is OK */;
2841 /* don't wakeup anyone, leave that to userspace. */
2843 if (slot
>= rdev
->mddev
->raid_disks
&&
2844 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2846 rdev
->raid_disk
= slot
;
2847 /* assume it is working */
2848 clear_bit(Faulty
, &rdev
->flags
);
2849 clear_bit(WriteMostly
, &rdev
->flags
);
2850 set_bit(In_sync
, &rdev
->flags
);
2851 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2857 static struct rdev_sysfs_entry rdev_slot
=
2858 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2861 offset_show(struct md_rdev
*rdev
, char *page
)
2863 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2867 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2869 unsigned long long offset
;
2870 if (strict_strtoull(buf
, 10, &offset
) < 0)
2872 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2874 if (rdev
->sectors
&& rdev
->mddev
->external
)
2875 /* Must set offset before size, so overlap checks
2878 rdev
->data_offset
= offset
;
2879 rdev
->new_data_offset
= offset
;
2883 static struct rdev_sysfs_entry rdev_offset
=
2884 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2886 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2888 return sprintf(page
, "%llu\n",
2889 (unsigned long long)rdev
->new_data_offset
);
2892 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2893 const char *buf
, size_t len
)
2895 unsigned long long new_offset
;
2896 struct mddev
*mddev
= rdev
->mddev
;
2898 if (strict_strtoull(buf
, 10, &new_offset
) < 0)
2901 if (mddev
->sync_thread
)
2903 if (new_offset
== rdev
->data_offset
)
2904 /* reset is always permitted */
2906 else if (new_offset
> rdev
->data_offset
) {
2907 /* must not push array size beyond rdev_sectors */
2908 if (new_offset
- rdev
->data_offset
2909 + mddev
->dev_sectors
> rdev
->sectors
)
2912 /* Metadata worries about other space details. */
2914 /* decreasing the offset is inconsistent with a backwards
2917 if (new_offset
< rdev
->data_offset
&&
2918 mddev
->reshape_backwards
)
2920 /* Increasing offset is inconsistent with forwards
2921 * reshape. reshape_direction should be set to
2922 * 'backwards' first.
2924 if (new_offset
> rdev
->data_offset
&&
2925 !mddev
->reshape_backwards
)
2928 if (mddev
->pers
&& mddev
->persistent
&&
2929 !super_types
[mddev
->major_version
]
2930 .allow_new_offset(rdev
, new_offset
))
2932 rdev
->new_data_offset
= new_offset
;
2933 if (new_offset
> rdev
->data_offset
)
2934 mddev
->reshape_backwards
= 1;
2935 else if (new_offset
< rdev
->data_offset
)
2936 mddev
->reshape_backwards
= 0;
2940 static struct rdev_sysfs_entry rdev_new_offset
=
2941 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2944 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2946 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2949 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2951 /* check if two start/length pairs overlap */
2959 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2961 unsigned long long blocks
;
2964 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2967 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2968 return -EINVAL
; /* sector conversion overflow */
2971 if (new != blocks
* 2)
2972 return -EINVAL
; /* unsigned long long to sector_t overflow */
2979 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2981 struct mddev
*my_mddev
= rdev
->mddev
;
2982 sector_t oldsectors
= rdev
->sectors
;
2985 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2987 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2988 return -EINVAL
; /* too confusing */
2989 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2990 if (my_mddev
->persistent
) {
2991 sectors
= super_types
[my_mddev
->major_version
].
2992 rdev_size_change(rdev
, sectors
);
2995 } else if (!sectors
)
2996 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2998 if (!my_mddev
->pers
->resize
)
2999 /* Cannot change size for RAID0 or Linear etc */
3002 if (sectors
< my_mddev
->dev_sectors
)
3003 return -EINVAL
; /* component must fit device */
3005 rdev
->sectors
= sectors
;
3006 if (sectors
> oldsectors
&& my_mddev
->external
) {
3007 /* need to check that all other rdevs with the same ->bdev
3008 * do not overlap. We need to unlock the mddev to avoid
3009 * a deadlock. We have already changed rdev->sectors, and if
3010 * we have to change it back, we will have the lock again.
3012 struct mddev
*mddev
;
3014 struct list_head
*tmp
;
3016 mddev_unlock(my_mddev
);
3017 for_each_mddev(mddev
, tmp
) {
3018 struct md_rdev
*rdev2
;
3021 rdev_for_each(rdev2
, mddev
)
3022 if (rdev
->bdev
== rdev2
->bdev
&&
3024 overlaps(rdev
->data_offset
, rdev
->sectors
,
3030 mddev_unlock(mddev
);
3036 mddev_lock(my_mddev
);
3038 /* Someone else could have slipped in a size
3039 * change here, but doing so is just silly.
3040 * We put oldsectors back because we *know* it is
3041 * safe, and trust userspace not to race with
3044 rdev
->sectors
= oldsectors
;
3051 static struct rdev_sysfs_entry rdev_size
=
3052 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3055 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3057 unsigned long long recovery_start
= rdev
->recovery_offset
;
3059 if (test_bit(In_sync
, &rdev
->flags
) ||
3060 recovery_start
== MaxSector
)
3061 return sprintf(page
, "none\n");
3063 return sprintf(page
, "%llu\n", recovery_start
);
3066 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3068 unsigned long long recovery_start
;
3070 if (cmd_match(buf
, "none"))
3071 recovery_start
= MaxSector
;
3072 else if (strict_strtoull(buf
, 10, &recovery_start
))
3075 if (rdev
->mddev
->pers
&&
3076 rdev
->raid_disk
>= 0)
3079 rdev
->recovery_offset
= recovery_start
;
3080 if (recovery_start
== MaxSector
)
3081 set_bit(In_sync
, &rdev
->flags
);
3083 clear_bit(In_sync
, &rdev
->flags
);
3087 static struct rdev_sysfs_entry rdev_recovery_start
=
3088 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3092 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3094 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3096 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3098 return badblocks_show(&rdev
->badblocks
, page
, 0);
3100 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3102 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3103 /* Maybe that ack was all we needed */
3104 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3105 wake_up(&rdev
->blocked_wait
);
3108 static struct rdev_sysfs_entry rdev_bad_blocks
=
3109 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3112 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3114 return badblocks_show(&rdev
->badblocks
, page
, 1);
3116 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3118 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3120 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3121 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3123 static struct attribute
*rdev_default_attrs
[] = {
3128 &rdev_new_offset
.attr
,
3130 &rdev_recovery_start
.attr
,
3131 &rdev_bad_blocks
.attr
,
3132 &rdev_unack_bad_blocks
.attr
,
3136 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3138 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3139 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3140 struct mddev
*mddev
= rdev
->mddev
;
3146 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3148 if (rdev
->mddev
== NULL
)
3151 rv
= entry
->show(rdev
, page
);
3152 mddev_unlock(mddev
);
3158 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3159 const char *page
, size_t length
)
3161 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3162 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3164 struct mddev
*mddev
= rdev
->mddev
;
3168 if (!capable(CAP_SYS_ADMIN
))
3170 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3172 if (rdev
->mddev
== NULL
)
3175 rv
= entry
->store(rdev
, page
, length
);
3176 mddev_unlock(mddev
);
3181 static void rdev_free(struct kobject
*ko
)
3183 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3186 static const struct sysfs_ops rdev_sysfs_ops
= {
3187 .show
= rdev_attr_show
,
3188 .store
= rdev_attr_store
,
3190 static struct kobj_type rdev_ktype
= {
3191 .release
= rdev_free
,
3192 .sysfs_ops
= &rdev_sysfs_ops
,
3193 .default_attrs
= rdev_default_attrs
,
3196 int md_rdev_init(struct md_rdev
*rdev
)
3199 rdev
->saved_raid_disk
= -1;
3200 rdev
->raid_disk
= -1;
3202 rdev
->data_offset
= 0;
3203 rdev
->new_data_offset
= 0;
3204 rdev
->sb_events
= 0;
3205 rdev
->last_read_error
.tv_sec
= 0;
3206 rdev
->last_read_error
.tv_nsec
= 0;
3207 rdev
->sb_loaded
= 0;
3208 rdev
->bb_page
= NULL
;
3209 atomic_set(&rdev
->nr_pending
, 0);
3210 atomic_set(&rdev
->read_errors
, 0);
3211 atomic_set(&rdev
->corrected_errors
, 0);
3213 INIT_LIST_HEAD(&rdev
->same_set
);
3214 init_waitqueue_head(&rdev
->blocked_wait
);
3216 /* Add space to store bad block list.
3217 * This reserves the space even on arrays where it cannot
3218 * be used - I wonder if that matters
3220 rdev
->badblocks
.count
= 0;
3221 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3222 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3223 seqlock_init(&rdev
->badblocks
.lock
);
3224 if (rdev
->badblocks
.page
== NULL
)
3229 EXPORT_SYMBOL_GPL(md_rdev_init
);
3231 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3233 * mark the device faulty if:
3235 * - the device is nonexistent (zero size)
3236 * - the device has no valid superblock
3238 * a faulty rdev _never_ has rdev->sb set.
3240 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3242 char b
[BDEVNAME_SIZE
];
3244 struct md_rdev
*rdev
;
3247 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3249 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3250 return ERR_PTR(-ENOMEM
);
3253 err
= md_rdev_init(rdev
);
3256 err
= alloc_disk_sb(rdev
);
3260 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3264 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3266 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3269 "md: %s has zero or unknown size, marking faulty!\n",
3270 bdevname(rdev
->bdev
,b
));
3275 if (super_format
>= 0) {
3276 err
= super_types
[super_format
].
3277 load_super(rdev
, NULL
, super_minor
);
3278 if (err
== -EINVAL
) {
3280 "md: %s does not have a valid v%d.%d "
3281 "superblock, not importing!\n",
3282 bdevname(rdev
->bdev
,b
),
3283 super_format
, super_minor
);
3288 "md: could not read %s's sb, not importing!\n",
3289 bdevname(rdev
->bdev
,b
));
3299 md_rdev_clear(rdev
);
3301 return ERR_PTR(err
);
3305 * Check a full RAID array for plausibility
3309 static void analyze_sbs(struct mddev
* mddev
)
3312 struct md_rdev
*rdev
, *freshest
, *tmp
;
3313 char b
[BDEVNAME_SIZE
];
3316 rdev_for_each_safe(rdev
, tmp
, mddev
)
3317 switch (super_types
[mddev
->major_version
].
3318 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3326 "md: fatal superblock inconsistency in %s"
3327 " -- removing from array\n",
3328 bdevname(rdev
->bdev
,b
));
3329 kick_rdev_from_array(rdev
);
3333 super_types
[mddev
->major_version
].
3334 validate_super(mddev
, freshest
);
3337 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3338 if (mddev
->max_disks
&&
3339 (rdev
->desc_nr
>= mddev
->max_disks
||
3340 i
> mddev
->max_disks
)) {
3342 "md: %s: %s: only %d devices permitted\n",
3343 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3345 kick_rdev_from_array(rdev
);
3348 if (rdev
!= freshest
)
3349 if (super_types
[mddev
->major_version
].
3350 validate_super(mddev
, rdev
)) {
3351 printk(KERN_WARNING
"md: kicking non-fresh %s"
3353 bdevname(rdev
->bdev
,b
));
3354 kick_rdev_from_array(rdev
);
3357 if (mddev
->level
== LEVEL_MULTIPATH
) {
3358 rdev
->desc_nr
= i
++;
3359 rdev
->raid_disk
= rdev
->desc_nr
;
3360 set_bit(In_sync
, &rdev
->flags
);
3361 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3362 rdev
->raid_disk
= -1;
3363 clear_bit(In_sync
, &rdev
->flags
);
3368 /* Read a fixed-point number.
3369 * Numbers in sysfs attributes should be in "standard" units where
3370 * possible, so time should be in seconds.
3371 * However we internally use a a much smaller unit such as
3372 * milliseconds or jiffies.
3373 * This function takes a decimal number with a possible fractional
3374 * component, and produces an integer which is the result of
3375 * multiplying that number by 10^'scale'.
3376 * all without any floating-point arithmetic.
3378 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3380 unsigned long result
= 0;
3382 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3385 else if (decimals
< scale
) {
3388 result
= result
* 10 + value
;
3400 while (decimals
< scale
) {
3409 static void md_safemode_timeout(unsigned long data
);
3412 safe_delay_show(struct mddev
*mddev
, char *page
)
3414 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3415 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3418 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3422 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3425 mddev
->safemode_delay
= 0;
3427 unsigned long old_delay
= mddev
->safemode_delay
;
3428 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3429 if (mddev
->safemode_delay
== 0)
3430 mddev
->safemode_delay
= 1;
3431 if (mddev
->safemode_delay
< old_delay
)
3432 md_safemode_timeout((unsigned long)mddev
);
3436 static struct md_sysfs_entry md_safe_delay
=
3437 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3440 level_show(struct mddev
*mddev
, char *page
)
3442 struct md_personality
*p
= mddev
->pers
;
3444 return sprintf(page
, "%s\n", p
->name
);
3445 else if (mddev
->clevel
[0])
3446 return sprintf(page
, "%s\n", mddev
->clevel
);
3447 else if (mddev
->level
!= LEVEL_NONE
)
3448 return sprintf(page
, "%d\n", mddev
->level
);
3454 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3458 struct md_personality
*pers
;
3461 struct md_rdev
*rdev
;
3463 if (mddev
->pers
== NULL
) {
3466 if (len
>= sizeof(mddev
->clevel
))
3468 strncpy(mddev
->clevel
, buf
, len
);
3469 if (mddev
->clevel
[len
-1] == '\n')
3471 mddev
->clevel
[len
] = 0;
3472 mddev
->level
= LEVEL_NONE
;
3476 /* request to change the personality. Need to ensure:
3477 * - array is not engaged in resync/recovery/reshape
3478 * - old personality can be suspended
3479 * - new personality will access other array.
3482 if (mddev
->sync_thread
||
3483 mddev
->reshape_position
!= MaxSector
||
3484 mddev
->sysfs_active
)
3487 if (!mddev
->pers
->quiesce
) {
3488 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3489 mdname(mddev
), mddev
->pers
->name
);
3493 /* Now find the new personality */
3494 if (len
== 0 || len
>= sizeof(clevel
))
3496 strncpy(clevel
, buf
, len
);
3497 if (clevel
[len
-1] == '\n')
3500 if (strict_strtol(clevel
, 10, &level
))
3503 if (request_module("md-%s", clevel
) != 0)
3504 request_module("md-level-%s", clevel
);
3505 spin_lock(&pers_lock
);
3506 pers
= find_pers(level
, clevel
);
3507 if (!pers
|| !try_module_get(pers
->owner
)) {
3508 spin_unlock(&pers_lock
);
3509 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3512 spin_unlock(&pers_lock
);
3514 if (pers
== mddev
->pers
) {
3515 /* Nothing to do! */
3516 module_put(pers
->owner
);
3519 if (!pers
->takeover
) {
3520 module_put(pers
->owner
);
3521 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3522 mdname(mddev
), clevel
);
3526 rdev_for_each(rdev
, mddev
)
3527 rdev
->new_raid_disk
= rdev
->raid_disk
;
3529 /* ->takeover must set new_* and/or delta_disks
3530 * if it succeeds, and may set them when it fails.
3532 priv
= pers
->takeover(mddev
);
3534 mddev
->new_level
= mddev
->level
;
3535 mddev
->new_layout
= mddev
->layout
;
3536 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3537 mddev
->raid_disks
-= mddev
->delta_disks
;
3538 mddev
->delta_disks
= 0;
3539 mddev
->reshape_backwards
= 0;
3540 module_put(pers
->owner
);
3541 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3542 mdname(mddev
), clevel
);
3543 return PTR_ERR(priv
);
3546 /* Looks like we have a winner */
3547 mddev_suspend(mddev
);
3548 mddev
->pers
->stop(mddev
);
3550 if (mddev
->pers
->sync_request
== NULL
&&
3551 pers
->sync_request
!= NULL
) {
3552 /* need to add the md_redundancy_group */
3553 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3555 "md: cannot register extra attributes for %s\n",
3557 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3559 if (mddev
->pers
->sync_request
!= NULL
&&
3560 pers
->sync_request
== NULL
) {
3561 /* need to remove the md_redundancy_group */
3562 if (mddev
->to_remove
== NULL
)
3563 mddev
->to_remove
= &md_redundancy_group
;
3566 if (mddev
->pers
->sync_request
== NULL
&&
3568 /* We are converting from a no-redundancy array
3569 * to a redundancy array and metadata is managed
3570 * externally so we need to be sure that writes
3571 * won't block due to a need to transition
3573 * until external management is started.
3576 mddev
->safemode_delay
= 0;
3577 mddev
->safemode
= 0;
3580 rdev_for_each(rdev
, mddev
) {
3581 if (rdev
->raid_disk
< 0)
3583 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3584 rdev
->new_raid_disk
= -1;
3585 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3587 sysfs_unlink_rdev(mddev
, rdev
);
3589 rdev_for_each(rdev
, mddev
) {
3590 if (rdev
->raid_disk
< 0)
3592 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3594 rdev
->raid_disk
= rdev
->new_raid_disk
;
3595 if (rdev
->raid_disk
< 0)
3596 clear_bit(In_sync
, &rdev
->flags
);
3598 if (sysfs_link_rdev(mddev
, rdev
))
3599 printk(KERN_WARNING
"md: cannot register rd%d"
3600 " for %s after level change\n",
3601 rdev
->raid_disk
, mdname(mddev
));
3605 module_put(mddev
->pers
->owner
);
3607 mddev
->private = priv
;
3608 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3609 mddev
->level
= mddev
->new_level
;
3610 mddev
->layout
= mddev
->new_layout
;
3611 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3612 mddev
->delta_disks
= 0;
3613 mddev
->reshape_backwards
= 0;
3614 mddev
->degraded
= 0;
3615 if (mddev
->pers
->sync_request
== NULL
) {
3616 /* this is now an array without redundancy, so
3617 * it must always be in_sync
3620 del_timer_sync(&mddev
->safemode_timer
);
3622 blk_set_stacking_limits(&mddev
->queue
->limits
);
3624 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3625 mddev_resume(mddev
);
3626 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3627 md_new_event(mddev
);
3631 static struct md_sysfs_entry md_level
=
3632 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3636 layout_show(struct mddev
*mddev
, char *page
)
3638 /* just a number, not meaningful for all levels */
3639 if (mddev
->reshape_position
!= MaxSector
&&
3640 mddev
->layout
!= mddev
->new_layout
)
3641 return sprintf(page
, "%d (%d)\n",
3642 mddev
->new_layout
, mddev
->layout
);
3643 return sprintf(page
, "%d\n", mddev
->layout
);
3647 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3650 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3652 if (!*buf
|| (*e
&& *e
!= '\n'))
3657 if (mddev
->pers
->check_reshape
== NULL
)
3659 mddev
->new_layout
= n
;
3660 err
= mddev
->pers
->check_reshape(mddev
);
3662 mddev
->new_layout
= mddev
->layout
;
3666 mddev
->new_layout
= n
;
3667 if (mddev
->reshape_position
== MaxSector
)
3672 static struct md_sysfs_entry md_layout
=
3673 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3677 raid_disks_show(struct mddev
*mddev
, char *page
)
3679 if (mddev
->raid_disks
== 0)
3681 if (mddev
->reshape_position
!= MaxSector
&&
3682 mddev
->delta_disks
!= 0)
3683 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3684 mddev
->raid_disks
- mddev
->delta_disks
);
3685 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3688 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3691 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3695 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3697 if (!*buf
|| (*e
&& *e
!= '\n'))
3701 rv
= update_raid_disks(mddev
, n
);
3702 else if (mddev
->reshape_position
!= MaxSector
) {
3703 struct md_rdev
*rdev
;
3704 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3706 rdev_for_each(rdev
, mddev
) {
3708 rdev
->data_offset
< rdev
->new_data_offset
)
3711 rdev
->data_offset
> rdev
->new_data_offset
)
3714 mddev
->delta_disks
= n
- olddisks
;
3715 mddev
->raid_disks
= n
;
3716 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3718 mddev
->raid_disks
= n
;
3719 return rv
? rv
: len
;
3721 static struct md_sysfs_entry md_raid_disks
=
3722 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3725 chunk_size_show(struct mddev
*mddev
, char *page
)
3727 if (mddev
->reshape_position
!= MaxSector
&&
3728 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3729 return sprintf(page
, "%d (%d)\n",
3730 mddev
->new_chunk_sectors
<< 9,
3731 mddev
->chunk_sectors
<< 9);
3732 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3736 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3739 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3741 if (!*buf
|| (*e
&& *e
!= '\n'))
3746 if (mddev
->pers
->check_reshape
== NULL
)
3748 mddev
->new_chunk_sectors
= n
>> 9;
3749 err
= mddev
->pers
->check_reshape(mddev
);
3751 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3755 mddev
->new_chunk_sectors
= n
>> 9;
3756 if (mddev
->reshape_position
== MaxSector
)
3757 mddev
->chunk_sectors
= n
>> 9;
3761 static struct md_sysfs_entry md_chunk_size
=
3762 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3765 resync_start_show(struct mddev
*mddev
, char *page
)
3767 if (mddev
->recovery_cp
== MaxSector
)
3768 return sprintf(page
, "none\n");
3769 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3773 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3776 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3778 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3780 if (cmd_match(buf
, "none"))
3782 else if (!*buf
|| (*e
&& *e
!= '\n'))
3785 mddev
->recovery_cp
= n
;
3787 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3790 static struct md_sysfs_entry md_resync_start
=
3791 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3794 * The array state can be:
3797 * No devices, no size, no level
3798 * Equivalent to STOP_ARRAY ioctl
3800 * May have some settings, but array is not active
3801 * all IO results in error
3802 * When written, doesn't tear down array, but just stops it
3803 * suspended (not supported yet)
3804 * All IO requests will block. The array can be reconfigured.
3805 * Writing this, if accepted, will block until array is quiescent
3807 * no resync can happen. no superblocks get written.
3808 * write requests fail
3810 * like readonly, but behaves like 'clean' on a write request.
3812 * clean - no pending writes, but otherwise active.
3813 * When written to inactive array, starts without resync
3814 * If a write request arrives then
3815 * if metadata is known, mark 'dirty' and switch to 'active'.
3816 * if not known, block and switch to write-pending
3817 * If written to an active array that has pending writes, then fails.
3819 * fully active: IO and resync can be happening.
3820 * When written to inactive array, starts with resync
3823 * clean, but writes are blocked waiting for 'active' to be written.
3826 * like active, but no writes have been seen for a while (100msec).
3829 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3830 write_pending
, active_idle
, bad_word
};
3831 static char *array_states
[] = {
3832 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3833 "write-pending", "active-idle", NULL
};
3835 static int match_word(const char *word
, char **list
)
3838 for (n
=0; list
[n
]; n
++)
3839 if (cmd_match(word
, list
[n
]))
3845 array_state_show(struct mddev
*mddev
, char *page
)
3847 enum array_state st
= inactive
;
3860 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3862 else if (mddev
->safemode
)
3868 if (list_empty(&mddev
->disks
) &&
3869 mddev
->raid_disks
== 0 &&
3870 mddev
->dev_sectors
== 0)
3875 return sprintf(page
, "%s\n", array_states
[st
]);
3878 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3879 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3880 static int do_md_run(struct mddev
* mddev
);
3881 static int restart_array(struct mddev
*mddev
);
3884 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3887 enum array_state st
= match_word(buf
, array_states
);
3892 /* stopping an active array */
3893 err
= do_md_stop(mddev
, 0, NULL
);
3896 /* stopping an active array */
3898 err
= do_md_stop(mddev
, 2, NULL
);
3900 err
= 0; /* already inactive */
3903 break; /* not supported yet */
3906 err
= md_set_readonly(mddev
, NULL
);
3909 set_disk_ro(mddev
->gendisk
, 1);
3910 err
= do_md_run(mddev
);
3916 err
= md_set_readonly(mddev
, NULL
);
3917 else if (mddev
->ro
== 1)
3918 err
= restart_array(mddev
);
3921 set_disk_ro(mddev
->gendisk
, 0);
3925 err
= do_md_run(mddev
);
3930 restart_array(mddev
);
3931 spin_lock_irq(&mddev
->write_lock
);
3932 if (atomic_read(&mddev
->writes_pending
) == 0) {
3933 if (mddev
->in_sync
== 0) {
3935 if (mddev
->safemode
== 1)
3936 mddev
->safemode
= 0;
3937 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3942 spin_unlock_irq(&mddev
->write_lock
);
3948 restart_array(mddev
);
3949 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3950 wake_up(&mddev
->sb_wait
);
3954 set_disk_ro(mddev
->gendisk
, 0);
3955 err
= do_md_run(mddev
);
3960 /* these cannot be set */
3966 if (mddev
->hold_active
== UNTIL_IOCTL
)
3967 mddev
->hold_active
= 0;
3968 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3972 static struct md_sysfs_entry md_array_state
=
3973 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3976 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3977 return sprintf(page
, "%d\n",
3978 atomic_read(&mddev
->max_corr_read_errors
));
3982 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3985 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3987 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3988 atomic_set(&mddev
->max_corr_read_errors
, n
);
3994 static struct md_sysfs_entry max_corr_read_errors
=
3995 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3996 max_corrected_read_errors_store
);
3999 null_show(struct mddev
*mddev
, char *page
)
4005 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4007 /* buf must be %d:%d\n? giving major and minor numbers */
4008 /* The new device is added to the array.
4009 * If the array has a persistent superblock, we read the
4010 * superblock to initialise info and check validity.
4011 * Otherwise, only checking done is that in bind_rdev_to_array,
4012 * which mainly checks size.
4015 int major
= simple_strtoul(buf
, &e
, 10);
4018 struct md_rdev
*rdev
;
4021 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4023 minor
= simple_strtoul(e
+1, &e
, 10);
4024 if (*e
&& *e
!= '\n')
4026 dev
= MKDEV(major
, minor
);
4027 if (major
!= MAJOR(dev
) ||
4028 minor
!= MINOR(dev
))
4032 if (mddev
->persistent
) {
4033 rdev
= md_import_device(dev
, mddev
->major_version
,
4034 mddev
->minor_version
);
4035 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4036 struct md_rdev
*rdev0
4037 = list_entry(mddev
->disks
.next
,
4038 struct md_rdev
, same_set
);
4039 err
= super_types
[mddev
->major_version
]
4040 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4044 } else if (mddev
->external
)
4045 rdev
= md_import_device(dev
, -2, -1);
4047 rdev
= md_import_device(dev
, -1, -1);
4050 return PTR_ERR(rdev
);
4051 err
= bind_rdev_to_array(rdev
, mddev
);
4055 return err
? err
: len
;
4058 static struct md_sysfs_entry md_new_device
=
4059 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4062 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4065 unsigned long chunk
, end_chunk
;
4069 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4071 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4072 if (buf
== end
) break;
4073 if (*end
== '-') { /* range */
4075 end_chunk
= simple_strtoul(buf
, &end
, 0);
4076 if (buf
== end
) break;
4078 if (*end
&& !isspace(*end
)) break;
4079 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4080 buf
= skip_spaces(end
);
4082 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4087 static struct md_sysfs_entry md_bitmap
=
4088 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4091 size_show(struct mddev
*mddev
, char *page
)
4093 return sprintf(page
, "%llu\n",
4094 (unsigned long long)mddev
->dev_sectors
/ 2);
4097 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4100 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4102 /* If array is inactive, we can reduce the component size, but
4103 * not increase it (except from 0).
4104 * If array is active, we can try an on-line resize
4107 int err
= strict_blocks_to_sectors(buf
, §ors
);
4112 err
= update_size(mddev
, sectors
);
4113 md_update_sb(mddev
, 1);
4115 if (mddev
->dev_sectors
== 0 ||
4116 mddev
->dev_sectors
> sectors
)
4117 mddev
->dev_sectors
= sectors
;
4121 return err
? err
: len
;
4124 static struct md_sysfs_entry md_size
=
4125 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4128 /* Metadata version.
4130 * 'none' for arrays with no metadata (good luck...)
4131 * 'external' for arrays with externally managed metadata,
4132 * or N.M for internally known formats
4135 metadata_show(struct mddev
*mddev
, char *page
)
4137 if (mddev
->persistent
)
4138 return sprintf(page
, "%d.%d\n",
4139 mddev
->major_version
, mddev
->minor_version
);
4140 else if (mddev
->external
)
4141 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4143 return sprintf(page
, "none\n");
4147 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4151 /* Changing the details of 'external' metadata is
4152 * always permitted. Otherwise there must be
4153 * no devices attached to the array.
4155 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4157 else if (!list_empty(&mddev
->disks
))
4160 if (cmd_match(buf
, "none")) {
4161 mddev
->persistent
= 0;
4162 mddev
->external
= 0;
4163 mddev
->major_version
= 0;
4164 mddev
->minor_version
= 90;
4167 if (strncmp(buf
, "external:", 9) == 0) {
4168 size_t namelen
= len
-9;
4169 if (namelen
>= sizeof(mddev
->metadata_type
))
4170 namelen
= sizeof(mddev
->metadata_type
)-1;
4171 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4172 mddev
->metadata_type
[namelen
] = 0;
4173 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4174 mddev
->metadata_type
[--namelen
] = 0;
4175 mddev
->persistent
= 0;
4176 mddev
->external
= 1;
4177 mddev
->major_version
= 0;
4178 mddev
->minor_version
= 90;
4181 major
= simple_strtoul(buf
, &e
, 10);
4182 if (e
==buf
|| *e
!= '.')
4185 minor
= simple_strtoul(buf
, &e
, 10);
4186 if (e
==buf
|| (*e
&& *e
!= '\n') )
4188 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4190 mddev
->major_version
= major
;
4191 mddev
->minor_version
= minor
;
4192 mddev
->persistent
= 1;
4193 mddev
->external
= 0;
4197 static struct md_sysfs_entry md_metadata
=
4198 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4201 action_show(struct mddev
*mddev
, char *page
)
4203 char *type
= "idle";
4204 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4206 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4207 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4208 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4210 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4211 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4213 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4217 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4220 return sprintf(page
, "%s\n", type
);
4224 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4226 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4229 if (cmd_match(page
, "frozen"))
4230 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4232 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4234 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4235 if (mddev
->sync_thread
) {
4236 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4237 md_reap_sync_thread(mddev
);
4239 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4240 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4242 else if (cmd_match(page
, "resync"))
4243 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4244 else if (cmd_match(page
, "recover")) {
4245 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4246 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4247 } else if (cmd_match(page
, "reshape")) {
4249 if (mddev
->pers
->start_reshape
== NULL
)
4251 err
= mddev
->pers
->start_reshape(mddev
);
4254 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4256 if (cmd_match(page
, "check"))
4257 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4258 else if (!cmd_match(page
, "repair"))
4260 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4261 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4263 if (mddev
->ro
== 2) {
4264 /* A write to sync_action is enough to justify
4265 * canceling read-auto mode
4268 md_wakeup_thread(mddev
->sync_thread
);
4270 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4271 md_wakeup_thread(mddev
->thread
);
4272 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4277 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4279 return sprintf(page
, "%llu\n",
4280 (unsigned long long)
4281 atomic64_read(&mddev
->resync_mismatches
));
4284 static struct md_sysfs_entry md_scan_mode
=
4285 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4288 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4291 sync_min_show(struct mddev
*mddev
, char *page
)
4293 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4294 mddev
->sync_speed_min
? "local": "system");
4298 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4302 if (strncmp(buf
, "system", 6)==0) {
4303 mddev
->sync_speed_min
= 0;
4306 min
= simple_strtoul(buf
, &e
, 10);
4307 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4309 mddev
->sync_speed_min
= min
;
4313 static struct md_sysfs_entry md_sync_min
=
4314 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4317 sync_max_show(struct mddev
*mddev
, char *page
)
4319 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4320 mddev
->sync_speed_max
? "local": "system");
4324 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4328 if (strncmp(buf
, "system", 6)==0) {
4329 mddev
->sync_speed_max
= 0;
4332 max
= simple_strtoul(buf
, &e
, 10);
4333 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4335 mddev
->sync_speed_max
= max
;
4339 static struct md_sysfs_entry md_sync_max
=
4340 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4343 degraded_show(struct mddev
*mddev
, char *page
)
4345 return sprintf(page
, "%d\n", mddev
->degraded
);
4347 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4350 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4352 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4356 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4360 if (strict_strtol(buf
, 10, &n
))
4363 if (n
!= 0 && n
!= 1)
4366 mddev
->parallel_resync
= n
;
4368 if (mddev
->sync_thread
)
4369 wake_up(&resync_wait
);
4374 /* force parallel resync, even with shared block devices */
4375 static struct md_sysfs_entry md_sync_force_parallel
=
4376 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4377 sync_force_parallel_show
, sync_force_parallel_store
);
4380 sync_speed_show(struct mddev
*mddev
, char *page
)
4382 unsigned long resync
, dt
, db
;
4383 if (mddev
->curr_resync
== 0)
4384 return sprintf(page
, "none\n");
4385 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4386 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4388 db
= resync
- mddev
->resync_mark_cnt
;
4389 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4392 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4395 sync_completed_show(struct mddev
*mddev
, char *page
)
4397 unsigned long long max_sectors
, resync
;
4399 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4400 return sprintf(page
, "none\n");
4402 if (mddev
->curr_resync
== 1 ||
4403 mddev
->curr_resync
== 2)
4404 return sprintf(page
, "delayed\n");
4406 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4407 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4408 max_sectors
= mddev
->resync_max_sectors
;
4410 max_sectors
= mddev
->dev_sectors
;
4412 resync
= mddev
->curr_resync_completed
;
4413 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4416 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4419 min_sync_show(struct mddev
*mddev
, char *page
)
4421 return sprintf(page
, "%llu\n",
4422 (unsigned long long)mddev
->resync_min
);
4425 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4427 unsigned long long min
;
4428 if (strict_strtoull(buf
, 10, &min
))
4430 if (min
> mddev
->resync_max
)
4432 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4435 /* Must be a multiple of chunk_size */
4436 if (mddev
->chunk_sectors
) {
4437 sector_t temp
= min
;
4438 if (sector_div(temp
, mddev
->chunk_sectors
))
4441 mddev
->resync_min
= min
;
4446 static struct md_sysfs_entry md_min_sync
=
4447 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4450 max_sync_show(struct mddev
*mddev
, char *page
)
4452 if (mddev
->resync_max
== MaxSector
)
4453 return sprintf(page
, "max\n");
4455 return sprintf(page
, "%llu\n",
4456 (unsigned long long)mddev
->resync_max
);
4459 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4461 if (strncmp(buf
, "max", 3) == 0)
4462 mddev
->resync_max
= MaxSector
;
4464 unsigned long long max
;
4465 if (strict_strtoull(buf
, 10, &max
))
4467 if (max
< mddev
->resync_min
)
4469 if (max
< mddev
->resync_max
&&
4471 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4474 /* Must be a multiple of chunk_size */
4475 if (mddev
->chunk_sectors
) {
4476 sector_t temp
= max
;
4477 if (sector_div(temp
, mddev
->chunk_sectors
))
4480 mddev
->resync_max
= max
;
4482 wake_up(&mddev
->recovery_wait
);
4486 static struct md_sysfs_entry md_max_sync
=
4487 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4490 suspend_lo_show(struct mddev
*mddev
, char *page
)
4492 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4496 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4499 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4500 unsigned long long old
= mddev
->suspend_lo
;
4502 if (mddev
->pers
== NULL
||
4503 mddev
->pers
->quiesce
== NULL
)
4505 if (buf
== e
|| (*e
&& *e
!= '\n'))
4508 mddev
->suspend_lo
= new;
4510 /* Shrinking suspended region */
4511 mddev
->pers
->quiesce(mddev
, 2);
4513 /* Expanding suspended region - need to wait */
4514 mddev
->pers
->quiesce(mddev
, 1);
4515 mddev
->pers
->quiesce(mddev
, 0);
4519 static struct md_sysfs_entry md_suspend_lo
=
4520 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4524 suspend_hi_show(struct mddev
*mddev
, char *page
)
4526 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4530 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4533 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4534 unsigned long long old
= mddev
->suspend_hi
;
4536 if (mddev
->pers
== NULL
||
4537 mddev
->pers
->quiesce
== NULL
)
4539 if (buf
== e
|| (*e
&& *e
!= '\n'))
4542 mddev
->suspend_hi
= new;
4544 /* Shrinking suspended region */
4545 mddev
->pers
->quiesce(mddev
, 2);
4547 /* Expanding suspended region - need to wait */
4548 mddev
->pers
->quiesce(mddev
, 1);
4549 mddev
->pers
->quiesce(mddev
, 0);
4553 static struct md_sysfs_entry md_suspend_hi
=
4554 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4557 reshape_position_show(struct mddev
*mddev
, char *page
)
4559 if (mddev
->reshape_position
!= MaxSector
)
4560 return sprintf(page
, "%llu\n",
4561 (unsigned long long)mddev
->reshape_position
);
4562 strcpy(page
, "none\n");
4567 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4569 struct md_rdev
*rdev
;
4571 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4574 if (buf
== e
|| (*e
&& *e
!= '\n'))
4576 mddev
->reshape_position
= new;
4577 mddev
->delta_disks
= 0;
4578 mddev
->reshape_backwards
= 0;
4579 mddev
->new_level
= mddev
->level
;
4580 mddev
->new_layout
= mddev
->layout
;
4581 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4582 rdev_for_each(rdev
, mddev
)
4583 rdev
->new_data_offset
= rdev
->data_offset
;
4587 static struct md_sysfs_entry md_reshape_position
=
4588 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4589 reshape_position_store
);
4592 reshape_direction_show(struct mddev
*mddev
, char *page
)
4594 return sprintf(page
, "%s\n",
4595 mddev
->reshape_backwards
? "backwards" : "forwards");
4599 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4602 if (cmd_match(buf
, "forwards"))
4604 else if (cmd_match(buf
, "backwards"))
4608 if (mddev
->reshape_backwards
== backwards
)
4611 /* check if we are allowed to change */
4612 if (mddev
->delta_disks
)
4615 if (mddev
->persistent
&&
4616 mddev
->major_version
== 0)
4619 mddev
->reshape_backwards
= backwards
;
4623 static struct md_sysfs_entry md_reshape_direction
=
4624 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4625 reshape_direction_store
);
4628 array_size_show(struct mddev
*mddev
, char *page
)
4630 if (mddev
->external_size
)
4631 return sprintf(page
, "%llu\n",
4632 (unsigned long long)mddev
->array_sectors
/2);
4634 return sprintf(page
, "default\n");
4638 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4642 if (strncmp(buf
, "default", 7) == 0) {
4644 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4646 sectors
= mddev
->array_sectors
;
4648 mddev
->external_size
= 0;
4650 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4652 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4655 mddev
->external_size
= 1;
4658 mddev
->array_sectors
= sectors
;
4660 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4661 revalidate_disk(mddev
->gendisk
);
4666 static struct md_sysfs_entry md_array_size
=
4667 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4670 static struct attribute
*md_default_attrs
[] = {
4673 &md_raid_disks
.attr
,
4674 &md_chunk_size
.attr
,
4676 &md_resync_start
.attr
,
4678 &md_new_device
.attr
,
4679 &md_safe_delay
.attr
,
4680 &md_array_state
.attr
,
4681 &md_reshape_position
.attr
,
4682 &md_reshape_direction
.attr
,
4683 &md_array_size
.attr
,
4684 &max_corr_read_errors
.attr
,
4688 static struct attribute
*md_redundancy_attrs
[] = {
4690 &md_mismatches
.attr
,
4693 &md_sync_speed
.attr
,
4694 &md_sync_force_parallel
.attr
,
4695 &md_sync_completed
.attr
,
4698 &md_suspend_lo
.attr
,
4699 &md_suspend_hi
.attr
,
4704 static struct attribute_group md_redundancy_group
= {
4706 .attrs
= md_redundancy_attrs
,
4711 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4713 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4714 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4719 spin_lock(&all_mddevs_lock
);
4720 if (list_empty(&mddev
->all_mddevs
)) {
4721 spin_unlock(&all_mddevs_lock
);
4725 spin_unlock(&all_mddevs_lock
);
4727 rv
= mddev_lock(mddev
);
4729 rv
= entry
->show(mddev
, page
);
4730 mddev_unlock(mddev
);
4737 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4738 const char *page
, size_t length
)
4740 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4741 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4746 if (!capable(CAP_SYS_ADMIN
))
4748 spin_lock(&all_mddevs_lock
);
4749 if (list_empty(&mddev
->all_mddevs
)) {
4750 spin_unlock(&all_mddevs_lock
);
4754 spin_unlock(&all_mddevs_lock
);
4755 if (entry
->store
== new_dev_store
)
4756 flush_workqueue(md_misc_wq
);
4757 rv
= mddev_lock(mddev
);
4759 rv
= entry
->store(mddev
, page
, length
);
4760 mddev_unlock(mddev
);
4766 static void md_free(struct kobject
*ko
)
4768 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4770 if (mddev
->sysfs_state
)
4771 sysfs_put(mddev
->sysfs_state
);
4773 if (mddev
->gendisk
) {
4774 del_gendisk(mddev
->gendisk
);
4775 put_disk(mddev
->gendisk
);
4778 blk_cleanup_queue(mddev
->queue
);
4783 static const struct sysfs_ops md_sysfs_ops
= {
4784 .show
= md_attr_show
,
4785 .store
= md_attr_store
,
4787 static struct kobj_type md_ktype
= {
4789 .sysfs_ops
= &md_sysfs_ops
,
4790 .default_attrs
= md_default_attrs
,
4795 static void mddev_delayed_delete(struct work_struct
*ws
)
4797 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4799 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4800 kobject_del(&mddev
->kobj
);
4801 kobject_put(&mddev
->kobj
);
4804 static int md_alloc(dev_t dev
, char *name
)
4806 static DEFINE_MUTEX(disks_mutex
);
4807 struct mddev
*mddev
= mddev_find(dev
);
4808 struct gendisk
*disk
;
4817 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4818 shift
= partitioned
? MdpMinorShift
: 0;
4819 unit
= MINOR(mddev
->unit
) >> shift
;
4821 /* wait for any previous instance of this device to be
4822 * completely removed (mddev_delayed_delete).
4824 flush_workqueue(md_misc_wq
);
4826 mutex_lock(&disks_mutex
);
4832 /* Need to ensure that 'name' is not a duplicate.
4834 struct mddev
*mddev2
;
4835 spin_lock(&all_mddevs_lock
);
4837 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4838 if (mddev2
->gendisk
&&
4839 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4840 spin_unlock(&all_mddevs_lock
);
4843 spin_unlock(&all_mddevs_lock
);
4847 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4850 mddev
->queue
->queuedata
= mddev
;
4852 blk_queue_make_request(mddev
->queue
, md_make_request
);
4853 blk_set_stacking_limits(&mddev
->queue
->limits
);
4855 disk
= alloc_disk(1 << shift
);
4857 blk_cleanup_queue(mddev
->queue
);
4858 mddev
->queue
= NULL
;
4861 disk
->major
= MAJOR(mddev
->unit
);
4862 disk
->first_minor
= unit
<< shift
;
4864 strcpy(disk
->disk_name
, name
);
4865 else if (partitioned
)
4866 sprintf(disk
->disk_name
, "md_d%d", unit
);
4868 sprintf(disk
->disk_name
, "md%d", unit
);
4869 disk
->fops
= &md_fops
;
4870 disk
->private_data
= mddev
;
4871 disk
->queue
= mddev
->queue
;
4872 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4873 /* Allow extended partitions. This makes the
4874 * 'mdp' device redundant, but we can't really
4877 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4878 mddev
->gendisk
= disk
;
4879 /* As soon as we call add_disk(), another thread could get
4880 * through to md_open, so make sure it doesn't get too far
4882 mutex_lock(&mddev
->open_mutex
);
4885 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4886 &disk_to_dev(disk
)->kobj
, "%s", "md");
4888 /* This isn't possible, but as kobject_init_and_add is marked
4889 * __must_check, we must do something with the result
4891 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4895 if (mddev
->kobj
.sd
&&
4896 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4897 printk(KERN_DEBUG
"pointless warning\n");
4898 mutex_unlock(&mddev
->open_mutex
);
4900 mutex_unlock(&disks_mutex
);
4901 if (!error
&& mddev
->kobj
.sd
) {
4902 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4903 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4909 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4911 md_alloc(dev
, NULL
);
4915 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4917 /* val must be "md_*" where * is not all digits.
4918 * We allocate an array with a large free minor number, and
4919 * set the name to val. val must not already be an active name.
4921 int len
= strlen(val
);
4922 char buf
[DISK_NAME_LEN
];
4924 while (len
&& val
[len
-1] == '\n')
4926 if (len
>= DISK_NAME_LEN
)
4928 strlcpy(buf
, val
, len
+1);
4929 if (strncmp(buf
, "md_", 3) != 0)
4931 return md_alloc(0, buf
);
4934 static void md_safemode_timeout(unsigned long data
)
4936 struct mddev
*mddev
= (struct mddev
*) data
;
4938 if (!atomic_read(&mddev
->writes_pending
)) {
4939 mddev
->safemode
= 1;
4940 if (mddev
->external
)
4941 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4943 md_wakeup_thread(mddev
->thread
);
4946 static int start_dirty_degraded
;
4948 int md_run(struct mddev
*mddev
)
4951 struct md_rdev
*rdev
;
4952 struct md_personality
*pers
;
4954 if (list_empty(&mddev
->disks
))
4955 /* cannot run an array with no devices.. */
4960 /* Cannot run until previous stop completes properly */
4961 if (mddev
->sysfs_active
)
4965 * Analyze all RAID superblock(s)
4967 if (!mddev
->raid_disks
) {
4968 if (!mddev
->persistent
)
4973 if (mddev
->level
!= LEVEL_NONE
)
4974 request_module("md-level-%d", mddev
->level
);
4975 else if (mddev
->clevel
[0])
4976 request_module("md-%s", mddev
->clevel
);
4979 * Drop all container device buffers, from now on
4980 * the only valid external interface is through the md
4983 rdev_for_each(rdev
, mddev
) {
4984 if (test_bit(Faulty
, &rdev
->flags
))
4986 sync_blockdev(rdev
->bdev
);
4987 invalidate_bdev(rdev
->bdev
);
4989 /* perform some consistency tests on the device.
4990 * We don't want the data to overlap the metadata,
4991 * Internal Bitmap issues have been handled elsewhere.
4993 if (rdev
->meta_bdev
) {
4994 /* Nothing to check */;
4995 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4996 if (mddev
->dev_sectors
&&
4997 rdev
->data_offset
+ mddev
->dev_sectors
4999 printk("md: %s: data overlaps metadata\n",
5004 if (rdev
->sb_start
+ rdev
->sb_size
/512
5005 > rdev
->data_offset
) {
5006 printk("md: %s: metadata overlaps data\n",
5011 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5014 if (mddev
->bio_set
== NULL
)
5015 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5017 spin_lock(&pers_lock
);
5018 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5019 if (!pers
|| !try_module_get(pers
->owner
)) {
5020 spin_unlock(&pers_lock
);
5021 if (mddev
->level
!= LEVEL_NONE
)
5022 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5025 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5030 spin_unlock(&pers_lock
);
5031 if (mddev
->level
!= pers
->level
) {
5032 mddev
->level
= pers
->level
;
5033 mddev
->new_level
= pers
->level
;
5035 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5037 if (mddev
->reshape_position
!= MaxSector
&&
5038 pers
->start_reshape
== NULL
) {
5039 /* This personality cannot handle reshaping... */
5041 module_put(pers
->owner
);
5045 if (pers
->sync_request
) {
5046 /* Warn if this is a potentially silly
5049 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5050 struct md_rdev
*rdev2
;
5053 rdev_for_each(rdev
, mddev
)
5054 rdev_for_each(rdev2
, mddev
) {
5056 rdev
->bdev
->bd_contains
==
5057 rdev2
->bdev
->bd_contains
) {
5059 "%s: WARNING: %s appears to be"
5060 " on the same physical disk as"
5063 bdevname(rdev
->bdev
,b
),
5064 bdevname(rdev2
->bdev
,b2
));
5071 "True protection against single-disk"
5072 " failure might be compromised.\n");
5075 mddev
->recovery
= 0;
5076 /* may be over-ridden by personality */
5077 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5079 mddev
->ok_start_degraded
= start_dirty_degraded
;
5081 if (start_readonly
&& mddev
->ro
== 0)
5082 mddev
->ro
= 2; /* read-only, but switch on first write */
5084 err
= mddev
->pers
->run(mddev
);
5086 printk(KERN_ERR
"md: pers->run() failed ...\n");
5087 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5088 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5089 " but 'external_size' not in effect?\n", __func__
);
5091 "md: invalid array_size %llu > default size %llu\n",
5092 (unsigned long long)mddev
->array_sectors
/ 2,
5093 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5095 mddev
->pers
->stop(mddev
);
5097 if (err
== 0 && mddev
->pers
->sync_request
&&
5098 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5099 err
= bitmap_create(mddev
);
5101 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5102 mdname(mddev
), err
);
5103 mddev
->pers
->stop(mddev
);
5107 module_put(mddev
->pers
->owner
);
5109 bitmap_destroy(mddev
);
5112 if (mddev
->pers
->sync_request
) {
5113 if (mddev
->kobj
.sd
&&
5114 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5116 "md: cannot register extra attributes for %s\n",
5118 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5119 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5122 atomic_set(&mddev
->writes_pending
,0);
5123 atomic_set(&mddev
->max_corr_read_errors
,
5124 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5125 mddev
->safemode
= 0;
5126 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5127 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5128 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5132 rdev_for_each(rdev
, mddev
)
5133 if (rdev
->raid_disk
>= 0)
5134 if (sysfs_link_rdev(mddev
, rdev
))
5135 /* failure here is OK */;
5137 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5140 md_update_sb(mddev
, 0);
5142 md_new_event(mddev
);
5143 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5144 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5145 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5148 EXPORT_SYMBOL_GPL(md_run
);
5150 static int do_md_run(struct mddev
*mddev
)
5154 err
= md_run(mddev
);
5157 err
= bitmap_load(mddev
);
5159 bitmap_destroy(mddev
);
5163 md_wakeup_thread(mddev
->thread
);
5164 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5166 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5167 revalidate_disk(mddev
->gendisk
);
5169 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5174 static int restart_array(struct mddev
*mddev
)
5176 struct gendisk
*disk
= mddev
->gendisk
;
5178 /* Complain if it has no devices */
5179 if (list_empty(&mddev
->disks
))
5185 mddev
->safemode
= 0;
5187 set_disk_ro(disk
, 0);
5188 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5190 /* Kick recovery or resync if necessary */
5191 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5192 md_wakeup_thread(mddev
->thread
);
5193 md_wakeup_thread(mddev
->sync_thread
);
5194 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5198 /* similar to deny_write_access, but accounts for our holding a reference
5199 * to the file ourselves */
5200 static int deny_bitmap_write_access(struct file
* file
)
5202 struct inode
*inode
= file
->f_mapping
->host
;
5204 spin_lock(&inode
->i_lock
);
5205 if (atomic_read(&inode
->i_writecount
) > 1) {
5206 spin_unlock(&inode
->i_lock
);
5209 atomic_set(&inode
->i_writecount
, -1);
5210 spin_unlock(&inode
->i_lock
);
5215 void restore_bitmap_write_access(struct file
*file
)
5217 struct inode
*inode
= file
->f_mapping
->host
;
5219 spin_lock(&inode
->i_lock
);
5220 atomic_set(&inode
->i_writecount
, 1);
5221 spin_unlock(&inode
->i_lock
);
5224 static void md_clean(struct mddev
*mddev
)
5226 mddev
->array_sectors
= 0;
5227 mddev
->external_size
= 0;
5228 mddev
->dev_sectors
= 0;
5229 mddev
->raid_disks
= 0;
5230 mddev
->recovery_cp
= 0;
5231 mddev
->resync_min
= 0;
5232 mddev
->resync_max
= MaxSector
;
5233 mddev
->reshape_position
= MaxSector
;
5234 mddev
->external
= 0;
5235 mddev
->persistent
= 0;
5236 mddev
->level
= LEVEL_NONE
;
5237 mddev
->clevel
[0] = 0;
5240 mddev
->metadata_type
[0] = 0;
5241 mddev
->chunk_sectors
= 0;
5242 mddev
->ctime
= mddev
->utime
= 0;
5244 mddev
->max_disks
= 0;
5246 mddev
->can_decrease_events
= 0;
5247 mddev
->delta_disks
= 0;
5248 mddev
->reshape_backwards
= 0;
5249 mddev
->new_level
= LEVEL_NONE
;
5250 mddev
->new_layout
= 0;
5251 mddev
->new_chunk_sectors
= 0;
5252 mddev
->curr_resync
= 0;
5253 atomic64_set(&mddev
->resync_mismatches
, 0);
5254 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5255 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5256 mddev
->recovery
= 0;
5259 mddev
->degraded
= 0;
5260 mddev
->safemode
= 0;
5261 mddev
->merge_check_needed
= 0;
5262 mddev
->bitmap_info
.offset
= 0;
5263 mddev
->bitmap_info
.default_offset
= 0;
5264 mddev
->bitmap_info
.default_space
= 0;
5265 mddev
->bitmap_info
.chunksize
= 0;
5266 mddev
->bitmap_info
.daemon_sleep
= 0;
5267 mddev
->bitmap_info
.max_write_behind
= 0;
5270 static void __md_stop_writes(struct mddev
*mddev
)
5272 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5273 if (mddev
->sync_thread
) {
5274 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5275 md_reap_sync_thread(mddev
);
5278 del_timer_sync(&mddev
->safemode_timer
);
5280 bitmap_flush(mddev
);
5281 md_super_wait(mddev
);
5283 if (mddev
->ro
== 0 &&
5284 (!mddev
->in_sync
|| mddev
->flags
)) {
5285 /* mark array as shutdown cleanly */
5287 md_update_sb(mddev
, 1);
5291 void md_stop_writes(struct mddev
*mddev
)
5294 __md_stop_writes(mddev
);
5295 mddev_unlock(mddev
);
5297 EXPORT_SYMBOL_GPL(md_stop_writes
);
5299 static void __md_stop(struct mddev
*mddev
)
5302 mddev
->pers
->stop(mddev
);
5303 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5304 mddev
->to_remove
= &md_redundancy_group
;
5305 module_put(mddev
->pers
->owner
);
5307 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5310 void md_stop(struct mddev
*mddev
)
5312 /* stop the array and free an attached data structures.
5313 * This is called from dm-raid
5316 bitmap_destroy(mddev
);
5318 bioset_free(mddev
->bio_set
);
5321 EXPORT_SYMBOL_GPL(md_stop
);
5323 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5326 mutex_lock(&mddev
->open_mutex
);
5327 if (atomic_read(&mddev
->openers
) > !!bdev
) {
5328 printk("md: %s still in use.\n",mdname(mddev
));
5333 sync_blockdev(bdev
);
5335 __md_stop_writes(mddev
);
5341 set_disk_ro(mddev
->gendisk
, 1);
5342 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5343 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5347 mutex_unlock(&mddev
->open_mutex
);
5352 * 0 - completely stop and dis-assemble array
5353 * 2 - stop but do not disassemble array
5355 static int do_md_stop(struct mddev
* mddev
, int mode
,
5356 struct block_device
*bdev
)
5358 struct gendisk
*disk
= mddev
->gendisk
;
5359 struct md_rdev
*rdev
;
5361 mutex_lock(&mddev
->open_mutex
);
5362 if (atomic_read(&mddev
->openers
) > !!bdev
||
5363 mddev
->sysfs_active
) {
5364 printk("md: %s still in use.\n",mdname(mddev
));
5365 mutex_unlock(&mddev
->open_mutex
);
5369 /* It is possible IO was issued on some other
5370 * open file which was closed before we took ->open_mutex.
5371 * As that was not the last close __blkdev_put will not
5372 * have called sync_blockdev, so we must.
5374 sync_blockdev(bdev
);
5378 set_disk_ro(disk
, 0);
5380 __md_stop_writes(mddev
);
5382 mddev
->queue
->merge_bvec_fn
= NULL
;
5383 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5385 /* tell userspace to handle 'inactive' */
5386 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5388 rdev_for_each(rdev
, mddev
)
5389 if (rdev
->raid_disk
>= 0)
5390 sysfs_unlink_rdev(mddev
, rdev
);
5392 set_capacity(disk
, 0);
5393 mutex_unlock(&mddev
->open_mutex
);
5395 revalidate_disk(disk
);
5400 mutex_unlock(&mddev
->open_mutex
);
5402 * Free resources if final stop
5405 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5407 bitmap_destroy(mddev
);
5408 if (mddev
->bitmap_info
.file
) {
5409 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5410 fput(mddev
->bitmap_info
.file
);
5411 mddev
->bitmap_info
.file
= NULL
;
5413 mddev
->bitmap_info
.offset
= 0;
5415 export_array(mddev
);
5418 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5419 if (mddev
->hold_active
== UNTIL_STOP
)
5420 mddev
->hold_active
= 0;
5422 blk_integrity_unregister(disk
);
5423 md_new_event(mddev
);
5424 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5429 static void autorun_array(struct mddev
*mddev
)
5431 struct md_rdev
*rdev
;
5434 if (list_empty(&mddev
->disks
))
5437 printk(KERN_INFO
"md: running: ");
5439 rdev_for_each(rdev
, mddev
) {
5440 char b
[BDEVNAME_SIZE
];
5441 printk("<%s>", bdevname(rdev
->bdev
,b
));
5445 err
= do_md_run(mddev
);
5447 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5448 do_md_stop(mddev
, 0, NULL
);
5453 * lets try to run arrays based on all disks that have arrived
5454 * until now. (those are in pending_raid_disks)
5456 * the method: pick the first pending disk, collect all disks with
5457 * the same UUID, remove all from the pending list and put them into
5458 * the 'same_array' list. Then order this list based on superblock
5459 * update time (freshest comes first), kick out 'old' disks and
5460 * compare superblocks. If everything's fine then run it.
5462 * If "unit" is allocated, then bump its reference count
5464 static void autorun_devices(int part
)
5466 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5467 struct mddev
*mddev
;
5468 char b
[BDEVNAME_SIZE
];
5470 printk(KERN_INFO
"md: autorun ...\n");
5471 while (!list_empty(&pending_raid_disks
)) {
5474 LIST_HEAD(candidates
);
5475 rdev0
= list_entry(pending_raid_disks
.next
,
5476 struct md_rdev
, same_set
);
5478 printk(KERN_INFO
"md: considering %s ...\n",
5479 bdevname(rdev0
->bdev
,b
));
5480 INIT_LIST_HEAD(&candidates
);
5481 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5482 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5483 printk(KERN_INFO
"md: adding %s ...\n",
5484 bdevname(rdev
->bdev
,b
));
5485 list_move(&rdev
->same_set
, &candidates
);
5488 * now we have a set of devices, with all of them having
5489 * mostly sane superblocks. It's time to allocate the
5493 dev
= MKDEV(mdp_major
,
5494 rdev0
->preferred_minor
<< MdpMinorShift
);
5495 unit
= MINOR(dev
) >> MdpMinorShift
;
5497 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5500 if (rdev0
->preferred_minor
!= unit
) {
5501 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5502 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5506 md_probe(dev
, NULL
, NULL
);
5507 mddev
= mddev_find(dev
);
5508 if (!mddev
|| !mddev
->gendisk
) {
5512 "md: cannot allocate memory for md drive.\n");
5515 if (mddev_lock(mddev
))
5516 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5518 else if (mddev
->raid_disks
|| mddev
->major_version
5519 || !list_empty(&mddev
->disks
)) {
5521 "md: %s already running, cannot run %s\n",
5522 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5523 mddev_unlock(mddev
);
5525 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5526 mddev
->persistent
= 1;
5527 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5528 list_del_init(&rdev
->same_set
);
5529 if (bind_rdev_to_array(rdev
, mddev
))
5532 autorun_array(mddev
);
5533 mddev_unlock(mddev
);
5535 /* on success, candidates will be empty, on error
5538 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5539 list_del_init(&rdev
->same_set
);
5544 printk(KERN_INFO
"md: ... autorun DONE.\n");
5546 #endif /* !MODULE */
5548 static int get_version(void __user
* arg
)
5552 ver
.major
= MD_MAJOR_VERSION
;
5553 ver
.minor
= MD_MINOR_VERSION
;
5554 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5556 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5562 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5564 mdu_array_info_t info
;
5565 int nr
,working
,insync
,failed
,spare
;
5566 struct md_rdev
*rdev
;
5568 nr
= working
= insync
= failed
= spare
= 0;
5570 rdev_for_each_rcu(rdev
, mddev
) {
5572 if (test_bit(Faulty
, &rdev
->flags
))
5576 if (test_bit(In_sync
, &rdev
->flags
))
5584 info
.major_version
= mddev
->major_version
;
5585 info
.minor_version
= mddev
->minor_version
;
5586 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5587 info
.ctime
= mddev
->ctime
;
5588 info
.level
= mddev
->level
;
5589 info
.size
= mddev
->dev_sectors
/ 2;
5590 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5593 info
.raid_disks
= mddev
->raid_disks
;
5594 info
.md_minor
= mddev
->md_minor
;
5595 info
.not_persistent
= !mddev
->persistent
;
5597 info
.utime
= mddev
->utime
;
5600 info
.state
= (1<<MD_SB_CLEAN
);
5601 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5602 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5603 info
.active_disks
= insync
;
5604 info
.working_disks
= working
;
5605 info
.failed_disks
= failed
;
5606 info
.spare_disks
= spare
;
5608 info
.layout
= mddev
->layout
;
5609 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5611 if (copy_to_user(arg
, &info
, sizeof(info
)))
5617 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5619 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5620 char *ptr
, *buf
= NULL
;
5623 if (md_allow_write(mddev
))
5624 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5626 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5631 /* bitmap disabled, zero the first byte and copy out */
5632 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5633 file
->pathname
[0] = '\0';
5637 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5641 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5642 buf
, sizeof(file
->pathname
));
5646 strcpy(file
->pathname
, ptr
);
5650 if (copy_to_user(arg
, file
, sizeof(*file
)))
5658 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5660 mdu_disk_info_t info
;
5661 struct md_rdev
*rdev
;
5663 if (copy_from_user(&info
, arg
, sizeof(info
)))
5667 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5669 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5670 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5671 info
.raid_disk
= rdev
->raid_disk
;
5673 if (test_bit(Faulty
, &rdev
->flags
))
5674 info
.state
|= (1<<MD_DISK_FAULTY
);
5675 else if (test_bit(In_sync
, &rdev
->flags
)) {
5676 info
.state
|= (1<<MD_DISK_ACTIVE
);
5677 info
.state
|= (1<<MD_DISK_SYNC
);
5679 if (test_bit(WriteMostly
, &rdev
->flags
))
5680 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5682 info
.major
= info
.minor
= 0;
5683 info
.raid_disk
= -1;
5684 info
.state
= (1<<MD_DISK_REMOVED
);
5688 if (copy_to_user(arg
, &info
, sizeof(info
)))
5694 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5696 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5697 struct md_rdev
*rdev
;
5698 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5700 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5703 if (!mddev
->raid_disks
) {
5705 /* expecting a device which has a superblock */
5706 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5709 "md: md_import_device returned %ld\n",
5711 return PTR_ERR(rdev
);
5713 if (!list_empty(&mddev
->disks
)) {
5714 struct md_rdev
*rdev0
5715 = list_entry(mddev
->disks
.next
,
5716 struct md_rdev
, same_set
);
5717 err
= super_types
[mddev
->major_version
]
5718 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5721 "md: %s has different UUID to %s\n",
5722 bdevname(rdev
->bdev
,b
),
5723 bdevname(rdev0
->bdev
,b2
));
5728 err
= bind_rdev_to_array(rdev
, mddev
);
5735 * add_new_disk can be used once the array is assembled
5736 * to add "hot spares". They must already have a superblock
5741 if (!mddev
->pers
->hot_add_disk
) {
5743 "%s: personality does not support diskops!\n",
5747 if (mddev
->persistent
)
5748 rdev
= md_import_device(dev
, mddev
->major_version
,
5749 mddev
->minor_version
);
5751 rdev
= md_import_device(dev
, -1, -1);
5754 "md: md_import_device returned %ld\n",
5756 return PTR_ERR(rdev
);
5758 /* set saved_raid_disk if appropriate */
5759 if (!mddev
->persistent
) {
5760 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5761 info
->raid_disk
< mddev
->raid_disks
) {
5762 rdev
->raid_disk
= info
->raid_disk
;
5763 set_bit(In_sync
, &rdev
->flags
);
5765 rdev
->raid_disk
= -1;
5767 super_types
[mddev
->major_version
].
5768 validate_super(mddev
, rdev
);
5769 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5770 rdev
->raid_disk
!= info
->raid_disk
) {
5771 /* This was a hot-add request, but events doesn't
5772 * match, so reject it.
5778 if (test_bit(In_sync
, &rdev
->flags
))
5779 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5781 rdev
->saved_raid_disk
= -1;
5783 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5784 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5785 set_bit(WriteMostly
, &rdev
->flags
);
5787 clear_bit(WriteMostly
, &rdev
->flags
);
5789 rdev
->raid_disk
= -1;
5790 err
= bind_rdev_to_array(rdev
, mddev
);
5791 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5792 /* If there is hot_add_disk but no hot_remove_disk
5793 * then added disks for geometry changes,
5794 * and should be added immediately.
5796 super_types
[mddev
->major_version
].
5797 validate_super(mddev
, rdev
);
5798 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5800 unbind_rdev_from_array(rdev
);
5805 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5807 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5808 if (mddev
->degraded
)
5809 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5810 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5812 md_new_event(mddev
);
5813 md_wakeup_thread(mddev
->thread
);
5817 /* otherwise, add_new_disk is only allowed
5818 * for major_version==0 superblocks
5820 if (mddev
->major_version
!= 0) {
5821 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5826 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5828 rdev
= md_import_device(dev
, -1, 0);
5831 "md: error, md_import_device() returned %ld\n",
5833 return PTR_ERR(rdev
);
5835 rdev
->desc_nr
= info
->number
;
5836 if (info
->raid_disk
< mddev
->raid_disks
)
5837 rdev
->raid_disk
= info
->raid_disk
;
5839 rdev
->raid_disk
= -1;
5841 if (rdev
->raid_disk
< mddev
->raid_disks
)
5842 if (info
->state
& (1<<MD_DISK_SYNC
))
5843 set_bit(In_sync
, &rdev
->flags
);
5845 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5846 set_bit(WriteMostly
, &rdev
->flags
);
5848 if (!mddev
->persistent
) {
5849 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5850 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5852 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5853 rdev
->sectors
= rdev
->sb_start
;
5855 err
= bind_rdev_to_array(rdev
, mddev
);
5865 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5867 char b
[BDEVNAME_SIZE
];
5868 struct md_rdev
*rdev
;
5870 rdev
= find_rdev(mddev
, dev
);
5874 clear_bit(Blocked
, &rdev
->flags
);
5875 remove_and_add_spares(mddev
, rdev
);
5877 if (rdev
->raid_disk
>= 0)
5880 kick_rdev_from_array(rdev
);
5881 md_update_sb(mddev
, 1);
5882 md_new_event(mddev
);
5886 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5887 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5891 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5893 char b
[BDEVNAME_SIZE
];
5895 struct md_rdev
*rdev
;
5900 if (mddev
->major_version
!= 0) {
5901 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5902 " version-0 superblocks.\n",
5906 if (!mddev
->pers
->hot_add_disk
) {
5908 "%s: personality does not support diskops!\n",
5913 rdev
= md_import_device(dev
, -1, 0);
5916 "md: error, md_import_device() returned %ld\n",
5921 if (mddev
->persistent
)
5922 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5924 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5926 rdev
->sectors
= rdev
->sb_start
;
5928 if (test_bit(Faulty
, &rdev
->flags
)) {
5930 "md: can not hot-add faulty %s disk to %s!\n",
5931 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5935 clear_bit(In_sync
, &rdev
->flags
);
5937 rdev
->saved_raid_disk
= -1;
5938 err
= bind_rdev_to_array(rdev
, mddev
);
5943 * The rest should better be atomic, we can have disk failures
5944 * noticed in interrupt contexts ...
5947 rdev
->raid_disk
= -1;
5949 md_update_sb(mddev
, 1);
5952 * Kick recovery, maybe this spare has to be added to the
5953 * array immediately.
5955 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5956 md_wakeup_thread(mddev
->thread
);
5957 md_new_event(mddev
);
5965 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5970 if (!mddev
->pers
->quiesce
)
5972 if (mddev
->recovery
|| mddev
->sync_thread
)
5974 /* we should be able to change the bitmap.. */
5980 return -EEXIST
; /* cannot add when bitmap is present */
5981 mddev
->bitmap_info
.file
= fget(fd
);
5983 if (mddev
->bitmap_info
.file
== NULL
) {
5984 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5989 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5991 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5993 fput(mddev
->bitmap_info
.file
);
5994 mddev
->bitmap_info
.file
= NULL
;
5997 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5998 } else if (mddev
->bitmap
== NULL
)
5999 return -ENOENT
; /* cannot remove what isn't there */
6002 mddev
->pers
->quiesce(mddev
, 1);
6004 err
= bitmap_create(mddev
);
6006 err
= bitmap_load(mddev
);
6008 if (fd
< 0 || err
) {
6009 bitmap_destroy(mddev
);
6010 fd
= -1; /* make sure to put the file */
6012 mddev
->pers
->quiesce(mddev
, 0);
6015 if (mddev
->bitmap_info
.file
) {
6016 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6017 fput(mddev
->bitmap_info
.file
);
6019 mddev
->bitmap_info
.file
= NULL
;
6026 * set_array_info is used two different ways
6027 * The original usage is when creating a new array.
6028 * In this usage, raid_disks is > 0 and it together with
6029 * level, size, not_persistent,layout,chunksize determine the
6030 * shape of the array.
6031 * This will always create an array with a type-0.90.0 superblock.
6032 * The newer usage is when assembling an array.
6033 * In this case raid_disks will be 0, and the major_version field is
6034 * use to determine which style super-blocks are to be found on the devices.
6035 * The minor and patch _version numbers are also kept incase the
6036 * super_block handler wishes to interpret them.
6038 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6041 if (info
->raid_disks
== 0) {
6042 /* just setting version number for superblock loading */
6043 if (info
->major_version
< 0 ||
6044 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6045 super_types
[info
->major_version
].name
== NULL
) {
6046 /* maybe try to auto-load a module? */
6048 "md: superblock version %d not known\n",
6049 info
->major_version
);
6052 mddev
->major_version
= info
->major_version
;
6053 mddev
->minor_version
= info
->minor_version
;
6054 mddev
->patch_version
= info
->patch_version
;
6055 mddev
->persistent
= !info
->not_persistent
;
6056 /* ensure mddev_put doesn't delete this now that there
6057 * is some minimal configuration.
6059 mddev
->ctime
= get_seconds();
6062 mddev
->major_version
= MD_MAJOR_VERSION
;
6063 mddev
->minor_version
= MD_MINOR_VERSION
;
6064 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6065 mddev
->ctime
= get_seconds();
6067 mddev
->level
= info
->level
;
6068 mddev
->clevel
[0] = 0;
6069 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6070 mddev
->raid_disks
= info
->raid_disks
;
6071 /* don't set md_minor, it is determined by which /dev/md* was
6074 if (info
->state
& (1<<MD_SB_CLEAN
))
6075 mddev
->recovery_cp
= MaxSector
;
6077 mddev
->recovery_cp
= 0;
6078 mddev
->persistent
= ! info
->not_persistent
;
6079 mddev
->external
= 0;
6081 mddev
->layout
= info
->layout
;
6082 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6084 mddev
->max_disks
= MD_SB_DISKS
;
6086 if (mddev
->persistent
)
6088 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6090 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6091 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6092 mddev
->bitmap_info
.offset
= 0;
6094 mddev
->reshape_position
= MaxSector
;
6097 * Generate a 128 bit UUID
6099 get_random_bytes(mddev
->uuid
, 16);
6101 mddev
->new_level
= mddev
->level
;
6102 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6103 mddev
->new_layout
= mddev
->layout
;
6104 mddev
->delta_disks
= 0;
6105 mddev
->reshape_backwards
= 0;
6110 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6112 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6114 if (mddev
->external_size
)
6117 mddev
->array_sectors
= array_sectors
;
6119 EXPORT_SYMBOL(md_set_array_sectors
);
6121 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6123 struct md_rdev
*rdev
;
6125 int fit
= (num_sectors
== 0);
6127 if (mddev
->pers
->resize
== NULL
)
6129 /* The "num_sectors" is the number of sectors of each device that
6130 * is used. This can only make sense for arrays with redundancy.
6131 * linear and raid0 always use whatever space is available. We can only
6132 * consider changing this number if no resync or reconstruction is
6133 * happening, and if the new size is acceptable. It must fit before the
6134 * sb_start or, if that is <data_offset, it must fit before the size
6135 * of each device. If num_sectors is zero, we find the largest size
6138 if (mddev
->sync_thread
)
6141 rdev_for_each(rdev
, mddev
) {
6142 sector_t avail
= rdev
->sectors
;
6144 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6145 num_sectors
= avail
;
6146 if (avail
< num_sectors
)
6149 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6151 revalidate_disk(mddev
->gendisk
);
6155 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6158 struct md_rdev
*rdev
;
6159 /* change the number of raid disks */
6160 if (mddev
->pers
->check_reshape
== NULL
)
6162 if (raid_disks
<= 0 ||
6163 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6165 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6168 rdev_for_each(rdev
, mddev
) {
6169 if (mddev
->raid_disks
< raid_disks
&&
6170 rdev
->data_offset
< rdev
->new_data_offset
)
6172 if (mddev
->raid_disks
> raid_disks
&&
6173 rdev
->data_offset
> rdev
->new_data_offset
)
6177 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6178 if (mddev
->delta_disks
< 0)
6179 mddev
->reshape_backwards
= 1;
6180 else if (mddev
->delta_disks
> 0)
6181 mddev
->reshape_backwards
= 0;
6183 rv
= mddev
->pers
->check_reshape(mddev
);
6185 mddev
->delta_disks
= 0;
6186 mddev
->reshape_backwards
= 0;
6193 * update_array_info is used to change the configuration of an
6195 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6196 * fields in the info are checked against the array.
6197 * Any differences that cannot be handled will cause an error.
6198 * Normally, only one change can be managed at a time.
6200 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6206 /* calculate expected state,ignoring low bits */
6207 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6208 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6210 if (mddev
->major_version
!= info
->major_version
||
6211 mddev
->minor_version
!= info
->minor_version
||
6212 /* mddev->patch_version != info->patch_version || */
6213 mddev
->ctime
!= info
->ctime
||
6214 mddev
->level
!= info
->level
||
6215 /* mddev->layout != info->layout || */
6216 !mddev
->persistent
!= info
->not_persistent
||
6217 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6218 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6219 ((state
^info
->state
) & 0xfffffe00)
6222 /* Check there is only one change */
6223 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6225 if (mddev
->raid_disks
!= info
->raid_disks
)
6227 if (mddev
->layout
!= info
->layout
)
6229 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6236 if (mddev
->layout
!= info
->layout
) {
6238 * we don't need to do anything at the md level, the
6239 * personality will take care of it all.
6241 if (mddev
->pers
->check_reshape
== NULL
)
6244 mddev
->new_layout
= info
->layout
;
6245 rv
= mddev
->pers
->check_reshape(mddev
);
6247 mddev
->new_layout
= mddev
->layout
;
6251 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6252 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6254 if (mddev
->raid_disks
!= info
->raid_disks
)
6255 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6257 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6258 if (mddev
->pers
->quiesce
== NULL
)
6260 if (mddev
->recovery
|| mddev
->sync_thread
)
6262 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6263 /* add the bitmap */
6266 if (mddev
->bitmap_info
.default_offset
== 0)
6268 mddev
->bitmap_info
.offset
=
6269 mddev
->bitmap_info
.default_offset
;
6270 mddev
->bitmap_info
.space
=
6271 mddev
->bitmap_info
.default_space
;
6272 mddev
->pers
->quiesce(mddev
, 1);
6273 rv
= bitmap_create(mddev
);
6275 rv
= bitmap_load(mddev
);
6277 bitmap_destroy(mddev
);
6278 mddev
->pers
->quiesce(mddev
, 0);
6280 /* remove the bitmap */
6283 if (mddev
->bitmap
->storage
.file
)
6285 mddev
->pers
->quiesce(mddev
, 1);
6286 bitmap_destroy(mddev
);
6287 mddev
->pers
->quiesce(mddev
, 0);
6288 mddev
->bitmap_info
.offset
= 0;
6291 md_update_sb(mddev
, 1);
6295 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6297 struct md_rdev
*rdev
;
6300 if (mddev
->pers
== NULL
)
6304 rdev
= find_rdev_rcu(mddev
, dev
);
6308 md_error(mddev
, rdev
);
6309 if (!test_bit(Faulty
, &rdev
->flags
))
6317 * We have a problem here : there is no easy way to give a CHS
6318 * virtual geometry. We currently pretend that we have a 2 heads
6319 * 4 sectors (with a BIG number of cylinders...). This drives
6320 * dosfs just mad... ;-)
6322 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6324 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6328 geo
->cylinders
= mddev
->array_sectors
/ 8;
6332 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6333 unsigned int cmd
, unsigned long arg
)
6336 void __user
*argp
= (void __user
*)arg
;
6337 struct mddev
*mddev
= NULL
;
6342 case GET_ARRAY_INFO
:
6346 if (!capable(CAP_SYS_ADMIN
))
6351 * Commands dealing with the RAID driver but not any
6356 err
= get_version(argp
);
6359 case PRINT_RAID_DEBUG
:
6367 autostart_arrays(arg
);
6374 * Commands creating/starting a new array:
6377 mddev
= bdev
->bd_disk
->private_data
;
6384 /* Some actions do not requires the mutex */
6386 case GET_ARRAY_INFO
:
6387 if (!mddev
->raid_disks
&& !mddev
->external
)
6390 err
= get_array_info(mddev
, argp
);
6394 if (!mddev
->raid_disks
&& !mddev
->external
)
6397 err
= get_disk_info(mddev
, argp
);
6400 case SET_DISK_FAULTY
:
6401 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6405 if (cmd
== ADD_NEW_DISK
)
6406 /* need to ensure md_delayed_delete() has completed */
6407 flush_workqueue(md_misc_wq
);
6409 err
= mddev_lock(mddev
);
6412 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6417 if (cmd
== SET_ARRAY_INFO
) {
6418 mdu_array_info_t info
;
6420 memset(&info
, 0, sizeof(info
));
6421 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6426 err
= update_array_info(mddev
, &info
);
6428 printk(KERN_WARNING
"md: couldn't update"
6429 " array info. %d\n", err
);
6434 if (!list_empty(&mddev
->disks
)) {
6436 "md: array %s already has disks!\n",
6441 if (mddev
->raid_disks
) {
6443 "md: array %s already initialised!\n",
6448 err
= set_array_info(mddev
, &info
);
6450 printk(KERN_WARNING
"md: couldn't set"
6451 " array info. %d\n", err
);
6458 * Commands querying/configuring an existing array:
6460 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6461 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6462 if ((!mddev
->raid_disks
&& !mddev
->external
)
6463 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6464 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6465 && cmd
!= GET_BITMAP_FILE
) {
6471 * Commands even a read-only array can execute:
6474 case GET_BITMAP_FILE
:
6475 err
= get_bitmap_file(mddev
, argp
);
6478 case RESTART_ARRAY_RW
:
6479 err
= restart_array(mddev
);
6483 err
= do_md_stop(mddev
, 0, bdev
);
6487 err
= md_set_readonly(mddev
, bdev
);
6490 case HOT_REMOVE_DISK
:
6491 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6495 /* We can support ADD_NEW_DISK on read-only arrays
6496 * on if we are re-adding a preexisting device.
6497 * So require mddev->pers and MD_DISK_SYNC.
6500 mdu_disk_info_t info
;
6501 if (copy_from_user(&info
, argp
, sizeof(info
)))
6503 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6504 /* Need to clear read-only for this */
6507 err
= add_new_disk(mddev
, &info
);
6513 if (get_user(ro
, (int __user
*)(arg
))) {
6519 /* if the bdev is going readonly the value of mddev->ro
6520 * does not matter, no writes are coming
6525 /* are we are already prepared for writes? */
6529 /* transitioning to readauto need only happen for
6530 * arrays that call md_write_start
6533 err
= restart_array(mddev
);
6536 set_disk_ro(mddev
->gendisk
, 0);
6543 * The remaining ioctls are changing the state of the
6544 * superblock, so we do not allow them on read-only arrays.
6545 * However non-MD ioctls (e.g. get-size) will still come through
6546 * here and hit the 'default' below, so only disallow
6547 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6549 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6550 if (mddev
->ro
== 2) {
6552 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6553 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6554 /* mddev_unlock will wake thread */
6555 /* If a device failed while we were read-only, we
6556 * need to make sure the metadata is updated now.
6558 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6559 mddev_unlock(mddev
);
6560 wait_event(mddev
->sb_wait
,
6561 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6562 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6574 mdu_disk_info_t info
;
6575 if (copy_from_user(&info
, argp
, sizeof(info
)))
6578 err
= add_new_disk(mddev
, &info
);
6583 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6587 err
= do_md_run(mddev
);
6590 case SET_BITMAP_FILE
:
6591 err
= set_bitmap_file(mddev
, (int)arg
);
6601 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6603 mddev
->hold_active
= 0;
6604 mddev_unlock(mddev
);
6613 #ifdef CONFIG_COMPAT
6614 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6615 unsigned int cmd
, unsigned long arg
)
6618 case HOT_REMOVE_DISK
:
6620 case SET_DISK_FAULTY
:
6621 case SET_BITMAP_FILE
:
6622 /* These take in integer arg, do not convert */
6625 arg
= (unsigned long)compat_ptr(arg
);
6629 return md_ioctl(bdev
, mode
, cmd
, arg
);
6631 #endif /* CONFIG_COMPAT */
6633 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6636 * Succeed if we can lock the mddev, which confirms that
6637 * it isn't being stopped right now.
6639 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6645 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6646 /* we are racing with mddev_put which is discarding this
6650 /* Wait until bdev->bd_disk is definitely gone */
6651 flush_workqueue(md_misc_wq
);
6652 /* Then retry the open from the top */
6653 return -ERESTARTSYS
;
6655 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6657 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6661 atomic_inc(&mddev
->openers
);
6662 mutex_unlock(&mddev
->open_mutex
);
6664 check_disk_change(bdev
);
6669 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6671 struct mddev
*mddev
= disk
->private_data
;
6674 atomic_dec(&mddev
->openers
);
6678 static int md_media_changed(struct gendisk
*disk
)
6680 struct mddev
*mddev
= disk
->private_data
;
6682 return mddev
->changed
;
6685 static int md_revalidate(struct gendisk
*disk
)
6687 struct mddev
*mddev
= disk
->private_data
;
6692 static const struct block_device_operations md_fops
=
6694 .owner
= THIS_MODULE
,
6696 .release
= md_release
,
6698 #ifdef CONFIG_COMPAT
6699 .compat_ioctl
= md_compat_ioctl
,
6701 .getgeo
= md_getgeo
,
6702 .media_changed
= md_media_changed
,
6703 .revalidate_disk
= md_revalidate
,
6706 static int md_thread(void * arg
)
6708 struct md_thread
*thread
= arg
;
6711 * md_thread is a 'system-thread', it's priority should be very
6712 * high. We avoid resource deadlocks individually in each
6713 * raid personality. (RAID5 does preallocation) We also use RR and
6714 * the very same RT priority as kswapd, thus we will never get
6715 * into a priority inversion deadlock.
6717 * we definitely have to have equal or higher priority than
6718 * bdflush, otherwise bdflush will deadlock if there are too
6719 * many dirty RAID5 blocks.
6722 allow_signal(SIGKILL
);
6723 while (!kthread_should_stop()) {
6725 /* We need to wait INTERRUPTIBLE so that
6726 * we don't add to the load-average.
6727 * That means we need to be sure no signals are
6730 if (signal_pending(current
))
6731 flush_signals(current
);
6733 wait_event_interruptible_timeout
6735 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6736 || kthread_should_stop(),
6739 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6740 if (!kthread_should_stop())
6741 thread
->run(thread
);
6747 void md_wakeup_thread(struct md_thread
*thread
)
6750 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6751 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6752 wake_up(&thread
->wqueue
);
6756 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6757 struct mddev
*mddev
, const char *name
)
6759 struct md_thread
*thread
;
6761 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6765 init_waitqueue_head(&thread
->wqueue
);
6768 thread
->mddev
= mddev
;
6769 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6770 thread
->tsk
= kthread_run(md_thread
, thread
,
6772 mdname(thread
->mddev
),
6774 if (IS_ERR(thread
->tsk
)) {
6781 void md_unregister_thread(struct md_thread
**threadp
)
6783 struct md_thread
*thread
= *threadp
;
6786 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6787 /* Locking ensures that mddev_unlock does not wake_up a
6788 * non-existent thread
6790 spin_lock(&pers_lock
);
6792 spin_unlock(&pers_lock
);
6794 kthread_stop(thread
->tsk
);
6798 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6805 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6808 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6810 mddev
->pers
->error_handler(mddev
,rdev
);
6811 if (mddev
->degraded
)
6812 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6813 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6814 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6815 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6816 md_wakeup_thread(mddev
->thread
);
6817 if (mddev
->event_work
.func
)
6818 queue_work(md_misc_wq
, &mddev
->event_work
);
6819 md_new_event_inintr(mddev
);
6822 /* seq_file implementation /proc/mdstat */
6824 static void status_unused(struct seq_file
*seq
)
6827 struct md_rdev
*rdev
;
6829 seq_printf(seq
, "unused devices: ");
6831 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6832 char b
[BDEVNAME_SIZE
];
6834 seq_printf(seq
, "%s ",
6835 bdevname(rdev
->bdev
,b
));
6838 seq_printf(seq
, "<none>");
6840 seq_printf(seq
, "\n");
6844 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6846 sector_t max_sectors
, resync
, res
;
6847 unsigned long dt
, db
;
6850 unsigned int per_milli
;
6852 if (mddev
->curr_resync
<= 3)
6855 resync
= mddev
->curr_resync
6856 - atomic_read(&mddev
->recovery_active
);
6858 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6859 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6860 max_sectors
= mddev
->resync_max_sectors
;
6862 max_sectors
= mddev
->dev_sectors
;
6865 * Should not happen.
6871 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6872 * in a sector_t, and (max_sectors>>scale) will fit in a
6873 * u32, as those are the requirements for sector_div.
6874 * Thus 'scale' must be at least 10
6877 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6878 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6881 res
= (resync
>>scale
)*1000;
6882 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6886 int i
, x
= per_milli
/50, y
= 20-x
;
6887 seq_printf(seq
, "[");
6888 for (i
= 0; i
< x
; i
++)
6889 seq_printf(seq
, "=");
6890 seq_printf(seq
, ">");
6891 for (i
= 0; i
< y
; i
++)
6892 seq_printf(seq
, ".");
6893 seq_printf(seq
, "] ");
6895 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6896 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6898 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6900 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6901 "resync" : "recovery"))),
6902 per_milli
/10, per_milli
% 10,
6903 (unsigned long long) resync
/2,
6904 (unsigned long long) max_sectors
/2);
6907 * dt: time from mark until now
6908 * db: blocks written from mark until now
6909 * rt: remaining time
6911 * rt is a sector_t, so could be 32bit or 64bit.
6912 * So we divide before multiply in case it is 32bit and close
6914 * We scale the divisor (db) by 32 to avoid losing precision
6915 * near the end of resync when the number of remaining sectors
6917 * We then divide rt by 32 after multiplying by db to compensate.
6918 * The '+1' avoids division by zero if db is very small.
6920 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6922 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6923 - mddev
->resync_mark_cnt
;
6925 rt
= max_sectors
- resync
; /* number of remaining sectors */
6926 sector_div(rt
, db
/32+1);
6930 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6931 ((unsigned long)rt
% 60)/6);
6933 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6936 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6938 struct list_head
*tmp
;
6940 struct mddev
*mddev
;
6948 spin_lock(&all_mddevs_lock
);
6949 list_for_each(tmp
,&all_mddevs
)
6951 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6953 spin_unlock(&all_mddevs_lock
);
6956 spin_unlock(&all_mddevs_lock
);
6958 return (void*)2;/* tail */
6962 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6964 struct list_head
*tmp
;
6965 struct mddev
*next_mddev
, *mddev
= v
;
6971 spin_lock(&all_mddevs_lock
);
6973 tmp
= all_mddevs
.next
;
6975 tmp
= mddev
->all_mddevs
.next
;
6976 if (tmp
!= &all_mddevs
)
6977 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6979 next_mddev
= (void*)2;
6982 spin_unlock(&all_mddevs_lock
);
6990 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6992 struct mddev
*mddev
= v
;
6994 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6998 static int md_seq_show(struct seq_file
*seq
, void *v
)
7000 struct mddev
*mddev
= v
;
7002 struct md_rdev
*rdev
;
7004 if (v
== (void*)1) {
7005 struct md_personality
*pers
;
7006 seq_printf(seq
, "Personalities : ");
7007 spin_lock(&pers_lock
);
7008 list_for_each_entry(pers
, &pers_list
, list
)
7009 seq_printf(seq
, "[%s] ", pers
->name
);
7011 spin_unlock(&pers_lock
);
7012 seq_printf(seq
, "\n");
7013 seq
->poll_event
= atomic_read(&md_event_count
);
7016 if (v
== (void*)2) {
7021 if (mddev_lock(mddev
) < 0)
7024 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7025 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7026 mddev
->pers
? "" : "in");
7029 seq_printf(seq
, " (read-only)");
7031 seq_printf(seq
, " (auto-read-only)");
7032 seq_printf(seq
, " %s", mddev
->pers
->name
);
7036 rdev_for_each(rdev
, mddev
) {
7037 char b
[BDEVNAME_SIZE
];
7038 seq_printf(seq
, " %s[%d]",
7039 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7040 if (test_bit(WriteMostly
, &rdev
->flags
))
7041 seq_printf(seq
, "(W)");
7042 if (test_bit(Faulty
, &rdev
->flags
)) {
7043 seq_printf(seq
, "(F)");
7046 if (rdev
->raid_disk
< 0)
7047 seq_printf(seq
, "(S)"); /* spare */
7048 if (test_bit(Replacement
, &rdev
->flags
))
7049 seq_printf(seq
, "(R)");
7050 sectors
+= rdev
->sectors
;
7053 if (!list_empty(&mddev
->disks
)) {
7055 seq_printf(seq
, "\n %llu blocks",
7056 (unsigned long long)
7057 mddev
->array_sectors
/ 2);
7059 seq_printf(seq
, "\n %llu blocks",
7060 (unsigned long long)sectors
/ 2);
7062 if (mddev
->persistent
) {
7063 if (mddev
->major_version
!= 0 ||
7064 mddev
->minor_version
!= 90) {
7065 seq_printf(seq
," super %d.%d",
7066 mddev
->major_version
,
7067 mddev
->minor_version
);
7069 } else if (mddev
->external
)
7070 seq_printf(seq
, " super external:%s",
7071 mddev
->metadata_type
);
7073 seq_printf(seq
, " super non-persistent");
7076 mddev
->pers
->status(seq
, mddev
);
7077 seq_printf(seq
, "\n ");
7078 if (mddev
->pers
->sync_request
) {
7079 if (mddev
->curr_resync
> 2) {
7080 status_resync(seq
, mddev
);
7081 seq_printf(seq
, "\n ");
7082 } else if (mddev
->curr_resync
>= 1)
7083 seq_printf(seq
, "\tresync=DELAYED\n ");
7084 else if (mddev
->recovery_cp
< MaxSector
)
7085 seq_printf(seq
, "\tresync=PENDING\n ");
7088 seq_printf(seq
, "\n ");
7090 bitmap_status(seq
, mddev
->bitmap
);
7092 seq_printf(seq
, "\n");
7094 mddev_unlock(mddev
);
7099 static const struct seq_operations md_seq_ops
= {
7100 .start
= md_seq_start
,
7101 .next
= md_seq_next
,
7102 .stop
= md_seq_stop
,
7103 .show
= md_seq_show
,
7106 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7108 struct seq_file
*seq
;
7111 error
= seq_open(file
, &md_seq_ops
);
7115 seq
= file
->private_data
;
7116 seq
->poll_event
= atomic_read(&md_event_count
);
7120 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7122 struct seq_file
*seq
= filp
->private_data
;
7125 poll_wait(filp
, &md_event_waiters
, wait
);
7127 /* always allow read */
7128 mask
= POLLIN
| POLLRDNORM
;
7130 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7131 mask
|= POLLERR
| POLLPRI
;
7135 static const struct file_operations md_seq_fops
= {
7136 .owner
= THIS_MODULE
,
7137 .open
= md_seq_open
,
7139 .llseek
= seq_lseek
,
7140 .release
= seq_release_private
,
7141 .poll
= mdstat_poll
,
7144 int register_md_personality(struct md_personality
*p
)
7146 spin_lock(&pers_lock
);
7147 list_add_tail(&p
->list
, &pers_list
);
7148 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7149 spin_unlock(&pers_lock
);
7153 int unregister_md_personality(struct md_personality
*p
)
7155 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7156 spin_lock(&pers_lock
);
7157 list_del_init(&p
->list
);
7158 spin_unlock(&pers_lock
);
7162 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7164 struct md_rdev
* rdev
;
7170 rdev_for_each_rcu(rdev
, mddev
) {
7171 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7172 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7173 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7174 atomic_read(&disk
->sync_io
);
7175 /* sync IO will cause sync_io to increase before the disk_stats
7176 * as sync_io is counted when a request starts, and
7177 * disk_stats is counted when it completes.
7178 * So resync activity will cause curr_events to be smaller than
7179 * when there was no such activity.
7180 * non-sync IO will cause disk_stat to increase without
7181 * increasing sync_io so curr_events will (eventually)
7182 * be larger than it was before. Once it becomes
7183 * substantially larger, the test below will cause
7184 * the array to appear non-idle, and resync will slow
7186 * If there is a lot of outstanding resync activity when
7187 * we set last_event to curr_events, then all that activity
7188 * completing might cause the array to appear non-idle
7189 * and resync will be slowed down even though there might
7190 * not have been non-resync activity. This will only
7191 * happen once though. 'last_events' will soon reflect
7192 * the state where there is little or no outstanding
7193 * resync requests, and further resync activity will
7194 * always make curr_events less than last_events.
7197 if (init
|| curr_events
- rdev
->last_events
> 64) {
7198 rdev
->last_events
= curr_events
;
7206 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7208 /* another "blocks" (512byte) blocks have been synced */
7209 atomic_sub(blocks
, &mddev
->recovery_active
);
7210 wake_up(&mddev
->recovery_wait
);
7212 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7213 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7214 md_wakeup_thread(mddev
->thread
);
7215 // stop recovery, signal do_sync ....
7220 /* md_write_start(mddev, bi)
7221 * If we need to update some array metadata (e.g. 'active' flag
7222 * in superblock) before writing, schedule a superblock update
7223 * and wait for it to complete.
7225 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7228 if (bio_data_dir(bi
) != WRITE
)
7231 BUG_ON(mddev
->ro
== 1);
7232 if (mddev
->ro
== 2) {
7233 /* need to switch to read/write */
7235 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7236 md_wakeup_thread(mddev
->thread
);
7237 md_wakeup_thread(mddev
->sync_thread
);
7240 atomic_inc(&mddev
->writes_pending
);
7241 if (mddev
->safemode
== 1)
7242 mddev
->safemode
= 0;
7243 if (mddev
->in_sync
) {
7244 spin_lock_irq(&mddev
->write_lock
);
7245 if (mddev
->in_sync
) {
7247 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7248 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7249 md_wakeup_thread(mddev
->thread
);
7252 spin_unlock_irq(&mddev
->write_lock
);
7255 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7256 wait_event(mddev
->sb_wait
,
7257 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7260 void md_write_end(struct mddev
*mddev
)
7262 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7263 if (mddev
->safemode
== 2)
7264 md_wakeup_thread(mddev
->thread
);
7265 else if (mddev
->safemode_delay
)
7266 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7270 /* md_allow_write(mddev)
7271 * Calling this ensures that the array is marked 'active' so that writes
7272 * may proceed without blocking. It is important to call this before
7273 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7274 * Must be called with mddev_lock held.
7276 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7277 * is dropped, so return -EAGAIN after notifying userspace.
7279 int md_allow_write(struct mddev
*mddev
)
7285 if (!mddev
->pers
->sync_request
)
7288 spin_lock_irq(&mddev
->write_lock
);
7289 if (mddev
->in_sync
) {
7291 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7292 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7293 if (mddev
->safemode_delay
&&
7294 mddev
->safemode
== 0)
7295 mddev
->safemode
= 1;
7296 spin_unlock_irq(&mddev
->write_lock
);
7297 md_update_sb(mddev
, 0);
7298 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7300 spin_unlock_irq(&mddev
->write_lock
);
7302 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7307 EXPORT_SYMBOL_GPL(md_allow_write
);
7309 #define SYNC_MARKS 10
7310 #define SYNC_MARK_STEP (3*HZ)
7311 #define UPDATE_FREQUENCY (5*60*HZ)
7312 void md_do_sync(struct md_thread
*thread
)
7314 struct mddev
*mddev
= thread
->mddev
;
7315 struct mddev
*mddev2
;
7316 unsigned int currspeed
= 0,
7318 sector_t max_sectors
,j
, io_sectors
;
7319 unsigned long mark
[SYNC_MARKS
];
7320 unsigned long update_time
;
7321 sector_t mark_cnt
[SYNC_MARKS
];
7323 struct list_head
*tmp
;
7324 sector_t last_check
;
7326 struct md_rdev
*rdev
;
7328 struct blk_plug plug
;
7330 /* just incase thread restarts... */
7331 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7333 if (mddev
->ro
) /* never try to sync a read-only array */
7336 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7337 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
7338 desc
= "data-check";
7339 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7340 desc
= "requested-resync";
7343 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7348 /* we overload curr_resync somewhat here.
7349 * 0 == not engaged in resync at all
7350 * 2 == checking that there is no conflict with another sync
7351 * 1 == like 2, but have yielded to allow conflicting resync to
7353 * other == active in resync - this many blocks
7355 * Before starting a resync we must have set curr_resync to
7356 * 2, and then checked that every "conflicting" array has curr_resync
7357 * less than ours. When we find one that is the same or higher
7358 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7359 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7360 * This will mean we have to start checking from the beginning again.
7365 mddev
->curr_resync
= 2;
7368 if (kthread_should_stop())
7369 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7371 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7373 for_each_mddev(mddev2
, tmp
) {
7374 if (mddev2
== mddev
)
7376 if (!mddev
->parallel_resync
7377 && mddev2
->curr_resync
7378 && match_mddev_units(mddev
, mddev2
)) {
7380 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7381 /* arbitrarily yield */
7382 mddev
->curr_resync
= 1;
7383 wake_up(&resync_wait
);
7385 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7386 /* no need to wait here, we can wait the next
7387 * time 'round when curr_resync == 2
7390 /* We need to wait 'interruptible' so as not to
7391 * contribute to the load average, and not to
7392 * be caught by 'softlockup'
7394 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7395 if (!kthread_should_stop() &&
7396 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7397 printk(KERN_INFO
"md: delaying %s of %s"
7398 " until %s has finished (they"
7399 " share one or more physical units)\n",
7400 desc
, mdname(mddev
), mdname(mddev2
));
7402 if (signal_pending(current
))
7403 flush_signals(current
);
7405 finish_wait(&resync_wait
, &wq
);
7408 finish_wait(&resync_wait
, &wq
);
7411 } while (mddev
->curr_resync
< 2);
7414 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7415 /* resync follows the size requested by the personality,
7416 * which defaults to physical size, but can be virtual size
7418 max_sectors
= mddev
->resync_max_sectors
;
7419 atomic64_set(&mddev
->resync_mismatches
, 0);
7420 /* we don't use the checkpoint if there's a bitmap */
7421 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7422 j
= mddev
->resync_min
;
7423 else if (!mddev
->bitmap
)
7424 j
= mddev
->recovery_cp
;
7426 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7427 max_sectors
= mddev
->resync_max_sectors
;
7429 /* recovery follows the physical size of devices */
7430 max_sectors
= mddev
->dev_sectors
;
7433 rdev_for_each_rcu(rdev
, mddev
)
7434 if (rdev
->raid_disk
>= 0 &&
7435 !test_bit(Faulty
, &rdev
->flags
) &&
7436 !test_bit(In_sync
, &rdev
->flags
) &&
7437 rdev
->recovery_offset
< j
)
7438 j
= rdev
->recovery_offset
;
7442 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7443 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7444 " %d KB/sec/disk.\n", speed_min(mddev
));
7445 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7446 "(but not more than %d KB/sec) for %s.\n",
7447 speed_max(mddev
), desc
);
7449 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7452 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7454 mark_cnt
[m
] = io_sectors
;
7457 mddev
->resync_mark
= mark
[last_mark
];
7458 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7461 * Tune reconstruction:
7463 window
= 32*(PAGE_SIZE
/512);
7464 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7465 window
/2, (unsigned long long)max_sectors
/2);
7467 atomic_set(&mddev
->recovery_active
, 0);
7472 "md: resuming %s of %s from checkpoint.\n",
7473 desc
, mdname(mddev
));
7474 mddev
->curr_resync
= j
;
7476 mddev
->curr_resync
= 3; /* no longer delayed */
7477 mddev
->curr_resync_completed
= j
;
7478 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7479 md_new_event(mddev
);
7480 update_time
= jiffies
;
7482 blk_start_plug(&plug
);
7483 while (j
< max_sectors
) {
7488 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7489 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7490 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7491 > (max_sectors
>> 4)) ||
7492 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7493 (j
- mddev
->curr_resync_completed
)*2
7494 >= mddev
->resync_max
- mddev
->curr_resync_completed
7496 /* time to update curr_resync_completed */
7497 wait_event(mddev
->recovery_wait
,
7498 atomic_read(&mddev
->recovery_active
) == 0);
7499 mddev
->curr_resync_completed
= j
;
7500 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7501 j
> mddev
->recovery_cp
)
7502 mddev
->recovery_cp
= j
;
7503 update_time
= jiffies
;
7504 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7505 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7508 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
7509 /* As this condition is controlled by user-space,
7510 * we can block indefinitely, so use '_interruptible'
7511 * to avoid triggering warnings.
7513 flush_signals(current
); /* just in case */
7514 wait_event_interruptible(mddev
->recovery_wait
,
7515 mddev
->resync_max
> j
7516 || kthread_should_stop());
7519 if (kthread_should_stop())
7522 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7523 currspeed
< speed_min(mddev
));
7525 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7529 if (!skipped
) { /* actual IO requested */
7530 io_sectors
+= sectors
;
7531 atomic_add(sectors
, &mddev
->recovery_active
);
7534 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7539 mddev
->curr_resync
= j
;
7540 mddev
->curr_mark_cnt
= io_sectors
;
7541 if (last_check
== 0)
7542 /* this is the earliest that rebuild will be
7543 * visible in /proc/mdstat
7545 md_new_event(mddev
);
7547 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7550 last_check
= io_sectors
;
7552 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7554 int next
= (last_mark
+1) % SYNC_MARKS
;
7556 mddev
->resync_mark
= mark
[next
];
7557 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7558 mark
[next
] = jiffies
;
7559 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7564 if (kthread_should_stop())
7569 * this loop exits only if either when we are slower than
7570 * the 'hard' speed limit, or the system was IO-idle for
7572 * the system might be non-idle CPU-wise, but we only care
7573 * about not overloading the IO subsystem. (things like an
7574 * e2fsck being done on the RAID array should execute fast)
7578 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7579 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7581 if (currspeed
> speed_min(mddev
)) {
7582 if ((currspeed
> speed_max(mddev
)) ||
7583 !is_mddev_idle(mddev
, 0)) {
7589 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7591 * this also signals 'finished resyncing' to md_stop
7594 blk_finish_plug(&plug
);
7595 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7597 /* tell personality that we are finished */
7598 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7600 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7601 mddev
->curr_resync
> 2) {
7602 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7603 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7604 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7606 "md: checkpointing %s of %s.\n",
7607 desc
, mdname(mddev
));
7608 if (test_bit(MD_RECOVERY_ERROR
,
7610 mddev
->recovery_cp
=
7611 mddev
->curr_resync_completed
;
7613 mddev
->recovery_cp
=
7617 mddev
->recovery_cp
= MaxSector
;
7619 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7620 mddev
->curr_resync
= MaxSector
;
7622 rdev_for_each_rcu(rdev
, mddev
)
7623 if (rdev
->raid_disk
>= 0 &&
7624 mddev
->delta_disks
>= 0 &&
7625 !test_bit(Faulty
, &rdev
->flags
) &&
7626 !test_bit(In_sync
, &rdev
->flags
) &&
7627 rdev
->recovery_offset
< mddev
->curr_resync
)
7628 rdev
->recovery_offset
= mddev
->curr_resync
;
7633 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7635 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7636 /* We completed so min/max setting can be forgotten if used. */
7637 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7638 mddev
->resync_min
= 0;
7639 mddev
->resync_max
= MaxSector
;
7640 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7641 mddev
->resync_min
= mddev
->curr_resync_completed
;
7642 mddev
->curr_resync
= 0;
7643 wake_up(&resync_wait
);
7644 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7645 md_wakeup_thread(mddev
->thread
);
7650 * got a signal, exit.
7653 "md: md_do_sync() got signal ... exiting\n");
7654 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7658 EXPORT_SYMBOL_GPL(md_do_sync
);
7660 static int remove_and_add_spares(struct mddev
*mddev
,
7661 struct md_rdev
*this)
7663 struct md_rdev
*rdev
;
7667 rdev_for_each(rdev
, mddev
)
7668 if ((this == NULL
|| rdev
== this) &&
7669 rdev
->raid_disk
>= 0 &&
7670 !test_bit(Blocked
, &rdev
->flags
) &&
7671 (test_bit(Faulty
, &rdev
->flags
) ||
7672 ! test_bit(In_sync
, &rdev
->flags
)) &&
7673 atomic_read(&rdev
->nr_pending
)==0) {
7674 if (mddev
->pers
->hot_remove_disk(
7675 mddev
, rdev
) == 0) {
7676 sysfs_unlink_rdev(mddev
, rdev
);
7677 rdev
->raid_disk
= -1;
7681 if (removed
&& mddev
->kobj
.sd
)
7682 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7687 rdev_for_each(rdev
, mddev
) {
7688 if (rdev
->raid_disk
>= 0 &&
7689 !test_bit(In_sync
, &rdev
->flags
) &&
7690 !test_bit(Faulty
, &rdev
->flags
))
7692 if (rdev
->raid_disk
>= 0)
7694 if (test_bit(Faulty
, &rdev
->flags
))
7697 rdev
->saved_raid_disk
< 0)
7700 rdev
->recovery_offset
= 0;
7702 hot_add_disk(mddev
, rdev
) == 0) {
7703 if (sysfs_link_rdev(mddev
, rdev
))
7704 /* failure here is OK */;
7706 md_new_event(mddev
);
7707 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7712 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7717 * This routine is regularly called by all per-raid-array threads to
7718 * deal with generic issues like resync and super-block update.
7719 * Raid personalities that don't have a thread (linear/raid0) do not
7720 * need this as they never do any recovery or update the superblock.
7722 * It does not do any resync itself, but rather "forks" off other threads
7723 * to do that as needed.
7724 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7725 * "->recovery" and create a thread at ->sync_thread.
7726 * When the thread finishes it sets MD_RECOVERY_DONE
7727 * and wakeups up this thread which will reap the thread and finish up.
7728 * This thread also removes any faulty devices (with nr_pending == 0).
7730 * The overall approach is:
7731 * 1/ if the superblock needs updating, update it.
7732 * 2/ If a recovery thread is running, don't do anything else.
7733 * 3/ If recovery has finished, clean up, possibly marking spares active.
7734 * 4/ If there are any faulty devices, remove them.
7735 * 5/ If array is degraded, try to add spares devices
7736 * 6/ If array has spares or is not in-sync, start a resync thread.
7738 void md_check_recovery(struct mddev
*mddev
)
7740 if (mddev
->suspended
)
7744 bitmap_daemon_work(mddev
);
7746 if (signal_pending(current
)) {
7747 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7748 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7750 mddev
->safemode
= 2;
7752 flush_signals(current
);
7755 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7758 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7759 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7760 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7761 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7762 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7763 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7767 if (mddev_trylock(mddev
)) {
7771 /* On a read-only array we can:
7772 * - remove failed devices
7773 * - add already-in_sync devices if the array itself
7775 * As we only add devices that are already in-sync,
7776 * we can activate the spares immediately.
7778 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7779 remove_and_add_spares(mddev
, NULL
);
7780 mddev
->pers
->spare_active(mddev
);
7784 if (!mddev
->external
) {
7786 spin_lock_irq(&mddev
->write_lock
);
7787 if (mddev
->safemode
&&
7788 !atomic_read(&mddev
->writes_pending
) &&
7790 mddev
->recovery_cp
== MaxSector
) {
7793 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7795 if (mddev
->safemode
== 1)
7796 mddev
->safemode
= 0;
7797 spin_unlock_irq(&mddev
->write_lock
);
7799 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7803 md_update_sb(mddev
, 0);
7805 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7806 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7807 /* resync/recovery still happening */
7808 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7811 if (mddev
->sync_thread
) {
7812 md_reap_sync_thread(mddev
);
7815 /* Set RUNNING before clearing NEEDED to avoid
7816 * any transients in the value of "sync_action".
7818 mddev
->curr_resync_completed
= 0;
7819 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7820 /* Clear some bits that don't mean anything, but
7823 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7824 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7826 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7827 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7829 /* no recovery is running.
7830 * remove any failed drives, then
7831 * add spares if possible.
7832 * Spares are also removed and re-added, to allow
7833 * the personality to fail the re-add.
7836 if (mddev
->reshape_position
!= MaxSector
) {
7837 if (mddev
->pers
->check_reshape
== NULL
||
7838 mddev
->pers
->check_reshape(mddev
) != 0)
7839 /* Cannot proceed */
7841 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7842 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7843 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7844 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7845 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7846 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7847 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7848 } else if (mddev
->recovery_cp
< MaxSector
) {
7849 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7850 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7851 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7852 /* nothing to be done ... */
7855 if (mddev
->pers
->sync_request
) {
7857 /* We are adding a device or devices to an array
7858 * which has the bitmap stored on all devices.
7859 * So make sure all bitmap pages get written
7861 bitmap_write_all(mddev
->bitmap
);
7863 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7866 if (!mddev
->sync_thread
) {
7867 printk(KERN_ERR
"%s: could not start resync"
7870 /* leave the spares where they are, it shouldn't hurt */
7871 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7872 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7873 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7874 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7875 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7877 md_wakeup_thread(mddev
->sync_thread
);
7878 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7879 md_new_event(mddev
);
7882 if (!mddev
->sync_thread
) {
7883 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7884 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7886 if (mddev
->sysfs_action
)
7887 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7889 mddev_unlock(mddev
);
7893 void md_reap_sync_thread(struct mddev
*mddev
)
7895 struct md_rdev
*rdev
;
7897 /* resync has finished, collect result */
7898 md_unregister_thread(&mddev
->sync_thread
);
7899 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7900 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7902 /* activate any spares */
7903 if (mddev
->pers
->spare_active(mddev
)) {
7904 sysfs_notify(&mddev
->kobj
, NULL
,
7906 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7909 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7910 mddev
->pers
->finish_reshape
)
7911 mddev
->pers
->finish_reshape(mddev
);
7913 /* If array is no-longer degraded, then any saved_raid_disk
7914 * information must be scrapped. Also if any device is now
7915 * In_sync we must scrape the saved_raid_disk for that device
7916 * do the superblock for an incrementally recovered device
7919 rdev_for_each(rdev
, mddev
)
7920 if (!mddev
->degraded
||
7921 test_bit(In_sync
, &rdev
->flags
))
7922 rdev
->saved_raid_disk
= -1;
7924 md_update_sb(mddev
, 1);
7925 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7926 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7927 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7928 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7929 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7930 /* flag recovery needed just to double check */
7931 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7932 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7933 md_new_event(mddev
);
7934 if (mddev
->event_work
.func
)
7935 queue_work(md_misc_wq
, &mddev
->event_work
);
7938 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7940 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7941 wait_event_timeout(rdev
->blocked_wait
,
7942 !test_bit(Blocked
, &rdev
->flags
) &&
7943 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7944 msecs_to_jiffies(5000));
7945 rdev_dec_pending(rdev
, mddev
);
7947 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7949 void md_finish_reshape(struct mddev
*mddev
)
7951 /* called be personality module when reshape completes. */
7952 struct md_rdev
*rdev
;
7954 rdev_for_each(rdev
, mddev
) {
7955 if (rdev
->data_offset
> rdev
->new_data_offset
)
7956 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7958 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7959 rdev
->data_offset
= rdev
->new_data_offset
;
7962 EXPORT_SYMBOL(md_finish_reshape
);
7964 /* Bad block management.
7965 * We can record which blocks on each device are 'bad' and so just
7966 * fail those blocks, or that stripe, rather than the whole device.
7967 * Entries in the bad-block table are 64bits wide. This comprises:
7968 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7969 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7970 * A 'shift' can be set so that larger blocks are tracked and
7971 * consequently larger devices can be covered.
7972 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7974 * Locking of the bad-block table uses a seqlock so md_is_badblock
7975 * might need to retry if it is very unlucky.
7976 * We will sometimes want to check for bad blocks in a bi_end_io function,
7977 * so we use the write_seqlock_irq variant.
7979 * When looking for a bad block we specify a range and want to
7980 * know if any block in the range is bad. So we binary-search
7981 * to the last range that starts at-or-before the given endpoint,
7982 * (or "before the sector after the target range")
7983 * then see if it ends after the given start.
7985 * 0 if there are no known bad blocks in the range
7986 * 1 if there are known bad block which are all acknowledged
7987 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7988 * plus the start/length of the first bad section we overlap.
7990 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7991 sector_t
*first_bad
, int *bad_sectors
)
7997 sector_t target
= s
+ sectors
;
8000 if (bb
->shift
> 0) {
8001 /* round the start down, and the end up */
8003 target
+= (1<<bb
->shift
) - 1;
8004 target
>>= bb
->shift
;
8005 sectors
= target
- s
;
8007 /* 'target' is now the first block after the bad range */
8010 seq
= read_seqbegin(&bb
->lock
);
8015 /* Binary search between lo and hi for 'target'
8016 * i.e. for the last range that starts before 'target'
8018 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8019 * are known not to be the last range before target.
8020 * VARIANT: hi-lo is the number of possible
8021 * ranges, and decreases until it reaches 1
8023 while (hi
- lo
> 1) {
8024 int mid
= (lo
+ hi
) / 2;
8025 sector_t a
= BB_OFFSET(p
[mid
]);
8027 /* This could still be the one, earlier ranges
8031 /* This and later ranges are definitely out. */
8034 /* 'lo' might be the last that started before target, but 'hi' isn't */
8036 /* need to check all range that end after 's' to see if
8037 * any are unacknowledged.
8040 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8041 if (BB_OFFSET(p
[lo
]) < target
) {
8042 /* starts before the end, and finishes after
8043 * the start, so they must overlap
8045 if (rv
!= -1 && BB_ACK(p
[lo
]))
8049 *first_bad
= BB_OFFSET(p
[lo
]);
8050 *bad_sectors
= BB_LEN(p
[lo
]);
8056 if (read_seqretry(&bb
->lock
, seq
))
8061 EXPORT_SYMBOL_GPL(md_is_badblock
);
8064 * Add a range of bad blocks to the table.
8065 * This might extend the table, or might contract it
8066 * if two adjacent ranges can be merged.
8067 * We binary-search to find the 'insertion' point, then
8068 * decide how best to handle it.
8070 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8076 unsigned long flags
;
8079 /* badblocks are disabled */
8083 /* round the start down, and the end up */
8084 sector_t next
= s
+ sectors
;
8086 next
+= (1<<bb
->shift
) - 1;
8091 write_seqlock_irqsave(&bb
->lock
, flags
);
8096 /* Find the last range that starts at-or-before 's' */
8097 while (hi
- lo
> 1) {
8098 int mid
= (lo
+ hi
) / 2;
8099 sector_t a
= BB_OFFSET(p
[mid
]);
8105 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8109 /* we found a range that might merge with the start
8112 sector_t a
= BB_OFFSET(p
[lo
]);
8113 sector_t e
= a
+ BB_LEN(p
[lo
]);
8114 int ack
= BB_ACK(p
[lo
]);
8116 /* Yes, we can merge with a previous range */
8117 if (s
== a
&& s
+ sectors
>= e
)
8118 /* new range covers old */
8121 ack
= ack
&& acknowledged
;
8123 if (e
< s
+ sectors
)
8125 if (e
- a
<= BB_MAX_LEN
) {
8126 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8129 /* does not all fit in one range,
8130 * make p[lo] maximal
8132 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8133 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8139 if (sectors
&& hi
< bb
->count
) {
8140 /* 'hi' points to the first range that starts after 's'.
8141 * Maybe we can merge with the start of that range */
8142 sector_t a
= BB_OFFSET(p
[hi
]);
8143 sector_t e
= a
+ BB_LEN(p
[hi
]);
8144 int ack
= BB_ACK(p
[hi
]);
8145 if (a
<= s
+ sectors
) {
8146 /* merging is possible */
8147 if (e
<= s
+ sectors
) {
8152 ack
= ack
&& acknowledged
;
8155 if (e
- a
<= BB_MAX_LEN
) {
8156 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8159 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8167 if (sectors
== 0 && hi
< bb
->count
) {
8168 /* we might be able to combine lo and hi */
8169 /* Note: 's' is at the end of 'lo' */
8170 sector_t a
= BB_OFFSET(p
[hi
]);
8171 int lolen
= BB_LEN(p
[lo
]);
8172 int hilen
= BB_LEN(p
[hi
]);
8173 int newlen
= lolen
+ hilen
- (s
- a
);
8174 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8175 /* yes, we can combine them */
8176 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8177 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8178 memmove(p
+ hi
, p
+ hi
+ 1,
8179 (bb
->count
- hi
- 1) * 8);
8184 /* didn't merge (it all).
8185 * Need to add a range just before 'hi' */
8186 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8187 /* No room for more */
8191 int this_sectors
= sectors
;
8192 memmove(p
+ hi
+ 1, p
+ hi
,
8193 (bb
->count
- hi
) * 8);
8196 if (this_sectors
> BB_MAX_LEN
)
8197 this_sectors
= BB_MAX_LEN
;
8198 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8199 sectors
-= this_sectors
;
8206 bb
->unacked_exist
= 1;
8207 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8212 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8217 s
+= rdev
->new_data_offset
;
8219 s
+= rdev
->data_offset
;
8220 rv
= md_set_badblocks(&rdev
->badblocks
,
8223 /* Make sure they get written out promptly */
8224 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8225 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8226 md_wakeup_thread(rdev
->mddev
->thread
);
8230 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8233 * Remove a range of bad blocks from the table.
8234 * This may involve extending the table if we spilt a region,
8235 * but it must not fail. So if the table becomes full, we just
8236 * drop the remove request.
8238 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8242 sector_t target
= s
+ sectors
;
8245 if (bb
->shift
> 0) {
8246 /* When clearing we round the start up and the end down.
8247 * This should not matter as the shift should align with
8248 * the block size and no rounding should ever be needed.
8249 * However it is better the think a block is bad when it
8250 * isn't than to think a block is not bad when it is.
8252 s
+= (1<<bb
->shift
) - 1;
8254 target
>>= bb
->shift
;
8255 sectors
= target
- s
;
8258 write_seqlock_irq(&bb
->lock
);
8263 /* Find the last range that starts before 'target' */
8264 while (hi
- lo
> 1) {
8265 int mid
= (lo
+ hi
) / 2;
8266 sector_t a
= BB_OFFSET(p
[mid
]);
8273 /* p[lo] is the last range that could overlap the
8274 * current range. Earlier ranges could also overlap,
8275 * but only this one can overlap the end of the range.
8277 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8278 /* Partial overlap, leave the tail of this range */
8279 int ack
= BB_ACK(p
[lo
]);
8280 sector_t a
= BB_OFFSET(p
[lo
]);
8281 sector_t end
= a
+ BB_LEN(p
[lo
]);
8284 /* we need to split this range */
8285 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8289 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8291 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8294 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8295 /* there is no longer an overlap */
8300 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8301 /* This range does overlap */
8302 if (BB_OFFSET(p
[lo
]) < s
) {
8303 /* Keep the early parts of this range. */
8304 int ack
= BB_ACK(p
[lo
]);
8305 sector_t start
= BB_OFFSET(p
[lo
]);
8306 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8307 /* now low doesn't overlap, so.. */
8312 /* 'lo' is strictly before, 'hi' is strictly after,
8313 * anything between needs to be discarded
8316 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8317 bb
->count
-= (hi
- lo
- 1);
8323 write_sequnlock_irq(&bb
->lock
);
8327 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8331 s
+= rdev
->new_data_offset
;
8333 s
+= rdev
->data_offset
;
8334 return md_clear_badblocks(&rdev
->badblocks
,
8337 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8340 * Acknowledge all bad blocks in a list.
8341 * This only succeeds if ->changed is clear. It is used by
8342 * in-kernel metadata updates
8344 void md_ack_all_badblocks(struct badblocks
*bb
)
8346 if (bb
->page
== NULL
|| bb
->changed
)
8347 /* no point even trying */
8349 write_seqlock_irq(&bb
->lock
);
8351 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8354 for (i
= 0; i
< bb
->count
; i
++) {
8355 if (!BB_ACK(p
[i
])) {
8356 sector_t start
= BB_OFFSET(p
[i
]);
8357 int len
= BB_LEN(p
[i
]);
8358 p
[i
] = BB_MAKE(start
, len
, 1);
8361 bb
->unacked_exist
= 0;
8363 write_sequnlock_irq(&bb
->lock
);
8365 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8367 /* sysfs access to bad-blocks list.
8368 * We present two files.
8369 * 'bad-blocks' lists sector numbers and lengths of ranges that
8370 * are recorded as bad. The list is truncated to fit within
8371 * the one-page limit of sysfs.
8372 * Writing "sector length" to this file adds an acknowledged
8374 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8375 * been acknowledged. Writing to this file adds bad blocks
8376 * without acknowledging them. This is largely for testing.
8380 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8391 seq
= read_seqbegin(&bb
->lock
);
8396 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8397 sector_t s
= BB_OFFSET(p
[i
]);
8398 unsigned int length
= BB_LEN(p
[i
]);
8399 int ack
= BB_ACK(p
[i
]);
8405 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8406 (unsigned long long)s
<< bb
->shift
,
8407 length
<< bb
->shift
);
8409 if (unack
&& len
== 0)
8410 bb
->unacked_exist
= 0;
8412 if (read_seqretry(&bb
->lock
, seq
))
8421 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8423 unsigned long long sector
;
8427 /* Allow clearing via sysfs *only* for testing/debugging.
8428 * Normally only a successful write may clear a badblock
8431 if (page
[0] == '-') {
8435 #endif /* DO_DEBUG */
8437 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8439 if (newline
!= '\n')
8451 md_clear_badblocks(bb
, sector
, length
);
8454 #endif /* DO_DEBUG */
8455 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8461 static int md_notify_reboot(struct notifier_block
*this,
8462 unsigned long code
, void *x
)
8464 struct list_head
*tmp
;
8465 struct mddev
*mddev
;
8468 for_each_mddev(mddev
, tmp
) {
8469 if (mddev_trylock(mddev
)) {
8471 __md_stop_writes(mddev
);
8472 mddev
->safemode
= 2;
8473 mddev_unlock(mddev
);
8478 * certain more exotic SCSI devices are known to be
8479 * volatile wrt too early system reboots. While the
8480 * right place to handle this issue is the given
8481 * driver, we do want to have a safe RAID driver ...
8489 static struct notifier_block md_notifier
= {
8490 .notifier_call
= md_notify_reboot
,
8492 .priority
= INT_MAX
, /* before any real devices */
8495 static void md_geninit(void)
8497 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8499 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8502 static int __init
md_init(void)
8506 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8510 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8514 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8517 if ((ret
= register_blkdev(0, "mdp")) < 0)
8521 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8522 md_probe
, NULL
, NULL
);
8523 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8524 md_probe
, NULL
, NULL
);
8526 register_reboot_notifier(&md_notifier
);
8527 raid_table_header
= register_sysctl_table(raid_root_table
);
8533 unregister_blkdev(MD_MAJOR
, "md");
8535 destroy_workqueue(md_misc_wq
);
8537 destroy_workqueue(md_wq
);
8545 * Searches all registered partitions for autorun RAID arrays
8549 static LIST_HEAD(all_detected_devices
);
8550 struct detected_devices_node
{
8551 struct list_head list
;
8555 void md_autodetect_dev(dev_t dev
)
8557 struct detected_devices_node
*node_detected_dev
;
8559 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8560 if (node_detected_dev
) {
8561 node_detected_dev
->dev
= dev
;
8562 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8564 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8565 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8570 static void autostart_arrays(int part
)
8572 struct md_rdev
*rdev
;
8573 struct detected_devices_node
*node_detected_dev
;
8575 int i_scanned
, i_passed
;
8580 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8582 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8584 node_detected_dev
= list_entry(all_detected_devices
.next
,
8585 struct detected_devices_node
, list
);
8586 list_del(&node_detected_dev
->list
);
8587 dev
= node_detected_dev
->dev
;
8588 kfree(node_detected_dev
);
8589 rdev
= md_import_device(dev
,0, 90);
8593 if (test_bit(Faulty
, &rdev
->flags
)) {
8597 set_bit(AutoDetected
, &rdev
->flags
);
8598 list_add(&rdev
->same_set
, &pending_raid_disks
);
8602 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8603 i_scanned
, i_passed
);
8605 autorun_devices(part
);
8608 #endif /* !MODULE */
8610 static __exit
void md_exit(void)
8612 struct mddev
*mddev
;
8613 struct list_head
*tmp
;
8615 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8616 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8618 unregister_blkdev(MD_MAJOR
,"md");
8619 unregister_blkdev(mdp_major
, "mdp");
8620 unregister_reboot_notifier(&md_notifier
);
8621 unregister_sysctl_table(raid_table_header
);
8622 remove_proc_entry("mdstat", NULL
);
8623 for_each_mddev(mddev
, tmp
) {
8624 export_array(mddev
);
8625 mddev
->hold_active
= 0;
8627 destroy_workqueue(md_misc_wq
);
8628 destroy_workqueue(md_wq
);
8631 subsys_initcall(md_init
);
8632 module_exit(md_exit
)
8634 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8636 return sprintf(buffer
, "%d", start_readonly
);
8638 static int set_ro(const char *val
, struct kernel_param
*kp
)
8641 int num
= simple_strtoul(val
, &e
, 10);
8642 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8643 start_readonly
= num
;
8649 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8650 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8652 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8654 EXPORT_SYMBOL(register_md_personality
);
8655 EXPORT_SYMBOL(unregister_md_personality
);
8656 EXPORT_SYMBOL(md_error
);
8657 EXPORT_SYMBOL(md_done_sync
);
8658 EXPORT_SYMBOL(md_write_start
);
8659 EXPORT_SYMBOL(md_write_end
);
8660 EXPORT_SYMBOL(md_register_thread
);
8661 EXPORT_SYMBOL(md_unregister_thread
);
8662 EXPORT_SYMBOL(md_wakeup_thread
);
8663 EXPORT_SYMBOL(md_check_recovery
);
8664 EXPORT_SYMBOL(md_reap_sync_thread
);
8665 MODULE_LICENSE("GPL");
8666 MODULE_DESCRIPTION("MD RAID framework");
8668 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);