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 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
78 * Default number of read corrections we'll attempt on an rdev
79 * before ejecting it from the array. We divide the read error
80 * count by 2 for every hour elapsed between read errors.
82 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
84 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
85 * is 1000 KB/sec, so the extra system load does not show up that much.
86 * Increase it if you want to have more _guaranteed_ speed. Note that
87 * the RAID driver will use the maximum available bandwidth if the IO
88 * subsystem is idle. There is also an 'absolute maximum' reconstruction
89 * speed limit - in case reconstruction slows down your system despite
92 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
93 * or /sys/block/mdX/md/sync_speed_{min,max}
96 static int sysctl_speed_limit_min
= 1000;
97 static int sysctl_speed_limit_max
= 200000;
98 static inline int speed_min(struct mddev
*mddev
)
100 return mddev
->sync_speed_min
?
101 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
104 static inline int speed_max(struct mddev
*mddev
)
106 return mddev
->sync_speed_max
?
107 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
110 static struct ctl_table_header
*raid_table_header
;
112 static ctl_table raid_table
[] = {
114 .procname
= "speed_limit_min",
115 .data
= &sysctl_speed_limit_min
,
116 .maxlen
= sizeof(int),
117 .mode
= S_IRUGO
|S_IWUSR
,
118 .proc_handler
= proc_dointvec
,
121 .procname
= "speed_limit_max",
122 .data
= &sysctl_speed_limit_max
,
123 .maxlen
= sizeof(int),
124 .mode
= S_IRUGO
|S_IWUSR
,
125 .proc_handler
= proc_dointvec
,
130 static ctl_table raid_dir_table
[] = {
134 .mode
= S_IRUGO
|S_IXUGO
,
140 static ctl_table raid_root_table
[] = {
145 .child
= raid_dir_table
,
150 static const struct block_device_operations md_fops
;
152 static int start_readonly
;
155 * like bio_clone, but with a local bio set
158 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
163 if (!mddev
|| !mddev
->bio_set
)
164 return bio_alloc(gfp_mask
, nr_iovecs
);
166 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
171 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
173 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
176 if (!mddev
|| !mddev
->bio_set
)
177 return bio_clone(bio
, gfp_mask
);
179 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
181 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
183 void md_trim_bio(struct bio
*bio
, int offset
, int size
)
185 /* 'bio' is a cloned bio which we need to trim to match
186 * the given offset and size.
187 * This requires adjusting bi_sector, bi_size, and bi_io_vec
190 struct bio_vec
*bvec
;
194 if (offset
== 0 && size
== bio
->bi_size
)
197 bio
->bi_sector
+= offset
;
200 clear_bit(BIO_SEG_VALID
, &bio
->bi_flags
);
202 while (bio
->bi_idx
< bio
->bi_vcnt
&&
203 bio
->bi_io_vec
[bio
->bi_idx
].bv_len
<= offset
) {
204 /* remove this whole bio_vec */
205 offset
-= bio
->bi_io_vec
[bio
->bi_idx
].bv_len
;
208 if (bio
->bi_idx
< bio
->bi_vcnt
) {
209 bio
->bi_io_vec
[bio
->bi_idx
].bv_offset
+= offset
;
210 bio
->bi_io_vec
[bio
->bi_idx
].bv_len
-= offset
;
212 /* avoid any complications with bi_idx being non-zero*/
214 memmove(bio
->bi_io_vec
, bio
->bi_io_vec
+bio
->bi_idx
,
215 (bio
->bi_vcnt
- bio
->bi_idx
) * sizeof(struct bio_vec
));
216 bio
->bi_vcnt
-= bio
->bi_idx
;
219 /* Make sure vcnt and last bv are not too big */
220 bio_for_each_segment(bvec
, bio
, i
) {
221 if (sofar
+ bvec
->bv_len
> size
)
222 bvec
->bv_len
= size
- sofar
;
223 if (bvec
->bv_len
== 0) {
227 sofar
+= bvec
->bv_len
;
230 EXPORT_SYMBOL_GPL(md_trim_bio
);
233 * We have a system wide 'event count' that is incremented
234 * on any 'interesting' event, and readers of /proc/mdstat
235 * can use 'poll' or 'select' to find out when the event
239 * start array, stop array, error, add device, remove device,
240 * start build, activate spare
242 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
243 static atomic_t md_event_count
;
244 void md_new_event(struct mddev
*mddev
)
246 atomic_inc(&md_event_count
);
247 wake_up(&md_event_waiters
);
249 EXPORT_SYMBOL_GPL(md_new_event
);
251 /* Alternate version that can be called from interrupts
252 * when calling sysfs_notify isn't needed.
254 static void md_new_event_inintr(struct mddev
*mddev
)
256 atomic_inc(&md_event_count
);
257 wake_up(&md_event_waiters
);
261 * Enables to iterate over all existing md arrays
262 * all_mddevs_lock protects this list.
264 static LIST_HEAD(all_mddevs
);
265 static DEFINE_SPINLOCK(all_mddevs_lock
);
269 * iterates through all used mddevs in the system.
270 * We take care to grab the all_mddevs_lock whenever navigating
271 * the list, and to always hold a refcount when unlocked.
272 * Any code which breaks out of this loop while own
273 * a reference to the current mddev and must mddev_put it.
275 #define for_each_mddev(_mddev,_tmp) \
277 for (({ spin_lock(&all_mddevs_lock); \
278 _tmp = all_mddevs.next; \
280 ({ if (_tmp != &all_mddevs) \
281 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
282 spin_unlock(&all_mddevs_lock); \
283 if (_mddev) mddev_put(_mddev); \
284 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
285 _tmp != &all_mddevs;}); \
286 ({ spin_lock(&all_mddevs_lock); \
287 _tmp = _tmp->next;}) \
291 /* Rather than calling directly into the personality make_request function,
292 * IO requests come here first so that we can check if the device is
293 * being suspended pending a reconfiguration.
294 * We hold a refcount over the call to ->make_request. By the time that
295 * call has finished, the bio has been linked into some internal structure
296 * and so is visible to ->quiesce(), so we don't need the refcount any more.
298 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
300 const int rw
= bio_data_dir(bio
);
301 struct mddev
*mddev
= q
->queuedata
;
303 unsigned int sectors
;
305 if (mddev
== NULL
|| mddev
->pers
== NULL
310 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
311 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
314 smp_rmb(); /* Ensure implications of 'active' are visible */
316 if (mddev
->suspended
) {
319 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
320 TASK_UNINTERRUPTIBLE
);
321 if (!mddev
->suspended
)
327 finish_wait(&mddev
->sb_wait
, &__wait
);
329 atomic_inc(&mddev
->active_io
);
333 * save the sectors now since our bio can
334 * go away inside make_request
336 sectors
= bio_sectors(bio
);
337 mddev
->pers
->make_request(mddev
, bio
);
339 cpu
= part_stat_lock();
340 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
341 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
344 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
345 wake_up(&mddev
->sb_wait
);
348 /* mddev_suspend makes sure no new requests are submitted
349 * to the device, and that any requests that have been submitted
350 * are completely handled.
351 * Once ->stop is called and completes, the module will be completely
354 void mddev_suspend(struct mddev
*mddev
)
356 BUG_ON(mddev
->suspended
);
357 mddev
->suspended
= 1;
359 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
360 mddev
->pers
->quiesce(mddev
, 1);
362 del_timer_sync(&mddev
->safemode_timer
);
364 EXPORT_SYMBOL_GPL(mddev_suspend
);
366 void mddev_resume(struct mddev
*mddev
)
368 mddev
->suspended
= 0;
369 wake_up(&mddev
->sb_wait
);
370 mddev
->pers
->quiesce(mddev
, 0);
372 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
373 md_wakeup_thread(mddev
->thread
);
374 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
376 EXPORT_SYMBOL_GPL(mddev_resume
);
378 int mddev_congested(struct mddev
*mddev
, int bits
)
380 return mddev
->suspended
;
382 EXPORT_SYMBOL(mddev_congested
);
385 * Generic flush handling for md
388 static void md_end_flush(struct bio
*bio
, int err
)
390 struct md_rdev
*rdev
= bio
->bi_private
;
391 struct mddev
*mddev
= rdev
->mddev
;
393 rdev_dec_pending(rdev
, mddev
);
395 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
396 /* The pre-request flush has finished */
397 queue_work(md_wq
, &mddev
->flush_work
);
402 static void md_submit_flush_data(struct work_struct
*ws
);
404 static void submit_flushes(struct work_struct
*ws
)
406 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
407 struct md_rdev
*rdev
;
409 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
410 atomic_set(&mddev
->flush_pending
, 1);
412 rdev_for_each_rcu(rdev
, mddev
)
413 if (rdev
->raid_disk
>= 0 &&
414 !test_bit(Faulty
, &rdev
->flags
)) {
415 /* Take two references, one is dropped
416 * when request finishes, one after
417 * we reclaim rcu_read_lock
420 atomic_inc(&rdev
->nr_pending
);
421 atomic_inc(&rdev
->nr_pending
);
423 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
424 bi
->bi_end_io
= md_end_flush
;
425 bi
->bi_private
= rdev
;
426 bi
->bi_bdev
= rdev
->bdev
;
427 atomic_inc(&mddev
->flush_pending
);
428 submit_bio(WRITE_FLUSH
, bi
);
430 rdev_dec_pending(rdev
, mddev
);
433 if (atomic_dec_and_test(&mddev
->flush_pending
))
434 queue_work(md_wq
, &mddev
->flush_work
);
437 static void md_submit_flush_data(struct work_struct
*ws
)
439 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
440 struct bio
*bio
= mddev
->flush_bio
;
442 if (bio
->bi_size
== 0)
443 /* an empty barrier - all done */
446 bio
->bi_rw
&= ~REQ_FLUSH
;
447 mddev
->pers
->make_request(mddev
, bio
);
450 mddev
->flush_bio
= NULL
;
451 wake_up(&mddev
->sb_wait
);
454 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
456 spin_lock_irq(&mddev
->write_lock
);
457 wait_event_lock_irq(mddev
->sb_wait
,
460 mddev
->flush_bio
= bio
;
461 spin_unlock_irq(&mddev
->write_lock
);
463 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
464 queue_work(md_wq
, &mddev
->flush_work
);
466 EXPORT_SYMBOL(md_flush_request
);
468 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
470 struct mddev
*mddev
= cb
->data
;
471 md_wakeup_thread(mddev
->thread
);
474 EXPORT_SYMBOL(md_unplug
);
476 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
478 atomic_inc(&mddev
->active
);
482 static void mddev_delayed_delete(struct work_struct
*ws
);
484 static void mddev_put(struct mddev
*mddev
)
486 struct bio_set
*bs
= NULL
;
488 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
490 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
491 mddev
->ctime
== 0 && !mddev
->hold_active
) {
492 /* Array is not configured at all, and not held active,
494 list_del_init(&mddev
->all_mddevs
);
496 mddev
->bio_set
= NULL
;
497 if (mddev
->gendisk
) {
498 /* We did a probe so need to clean up. Call
499 * queue_work inside the spinlock so that
500 * flush_workqueue() after mddev_find will
501 * succeed in waiting for the work to be done.
503 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
504 queue_work(md_misc_wq
, &mddev
->del_work
);
508 spin_unlock(&all_mddevs_lock
);
513 void mddev_init(struct mddev
*mddev
)
515 mutex_init(&mddev
->open_mutex
);
516 mutex_init(&mddev
->reconfig_mutex
);
517 mutex_init(&mddev
->bitmap_info
.mutex
);
518 INIT_LIST_HEAD(&mddev
->disks
);
519 INIT_LIST_HEAD(&mddev
->all_mddevs
);
520 init_timer(&mddev
->safemode_timer
);
521 atomic_set(&mddev
->active
, 1);
522 atomic_set(&mddev
->openers
, 0);
523 atomic_set(&mddev
->active_io
, 0);
524 spin_lock_init(&mddev
->write_lock
);
525 atomic_set(&mddev
->flush_pending
, 0);
526 init_waitqueue_head(&mddev
->sb_wait
);
527 init_waitqueue_head(&mddev
->recovery_wait
);
528 mddev
->reshape_position
= MaxSector
;
529 mddev
->reshape_backwards
= 0;
530 mddev
->resync_min
= 0;
531 mddev
->resync_max
= MaxSector
;
532 mddev
->level
= LEVEL_NONE
;
534 EXPORT_SYMBOL_GPL(mddev_init
);
536 static struct mddev
* mddev_find(dev_t unit
)
538 struct mddev
*mddev
, *new = NULL
;
540 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
541 unit
&= ~((1<<MdpMinorShift
)-1);
544 spin_lock(&all_mddevs_lock
);
547 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
548 if (mddev
->unit
== unit
) {
550 spin_unlock(&all_mddevs_lock
);
556 list_add(&new->all_mddevs
, &all_mddevs
);
557 spin_unlock(&all_mddevs_lock
);
558 new->hold_active
= UNTIL_IOCTL
;
562 /* find an unused unit number */
563 static int next_minor
= 512;
564 int start
= next_minor
;
568 dev
= MKDEV(MD_MAJOR
, next_minor
);
570 if (next_minor
> MINORMASK
)
572 if (next_minor
== start
) {
573 /* Oh dear, all in use. */
574 spin_unlock(&all_mddevs_lock
);
580 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
581 if (mddev
->unit
== dev
) {
587 new->md_minor
= MINOR(dev
);
588 new->hold_active
= UNTIL_STOP
;
589 list_add(&new->all_mddevs
, &all_mddevs
);
590 spin_unlock(&all_mddevs_lock
);
593 spin_unlock(&all_mddevs_lock
);
595 new = kzalloc(sizeof(*new), GFP_KERNEL
);
600 if (MAJOR(unit
) == MD_MAJOR
)
601 new->md_minor
= MINOR(unit
);
603 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
610 static inline int mddev_lock(struct mddev
* mddev
)
612 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
615 static inline int mddev_is_locked(struct mddev
*mddev
)
617 return mutex_is_locked(&mddev
->reconfig_mutex
);
620 static inline int mddev_trylock(struct mddev
* mddev
)
622 return mutex_trylock(&mddev
->reconfig_mutex
);
625 static struct attribute_group md_redundancy_group
;
627 static void mddev_unlock(struct mddev
* mddev
)
629 if (mddev
->to_remove
) {
630 /* These cannot be removed under reconfig_mutex as
631 * an access to the files will try to take reconfig_mutex
632 * while holding the file unremovable, which leads to
634 * So hold set sysfs_active while the remove in happeing,
635 * and anything else which might set ->to_remove or my
636 * otherwise change the sysfs namespace will fail with
637 * -EBUSY if sysfs_active is still set.
638 * We set sysfs_active under reconfig_mutex and elsewhere
639 * test it under the same mutex to ensure its correct value
642 struct attribute_group
*to_remove
= mddev
->to_remove
;
643 mddev
->to_remove
= NULL
;
644 mddev
->sysfs_active
= 1;
645 mutex_unlock(&mddev
->reconfig_mutex
);
647 if (mddev
->kobj
.sd
) {
648 if (to_remove
!= &md_redundancy_group
)
649 sysfs_remove_group(&mddev
->kobj
, to_remove
);
650 if (mddev
->pers
== NULL
||
651 mddev
->pers
->sync_request
== NULL
) {
652 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
653 if (mddev
->sysfs_action
)
654 sysfs_put(mddev
->sysfs_action
);
655 mddev
->sysfs_action
= NULL
;
658 mddev
->sysfs_active
= 0;
660 mutex_unlock(&mddev
->reconfig_mutex
);
662 /* As we've dropped the mutex we need a spinlock to
663 * make sure the thread doesn't disappear
665 spin_lock(&pers_lock
);
666 md_wakeup_thread(mddev
->thread
);
667 spin_unlock(&pers_lock
);
670 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
672 struct md_rdev
*rdev
;
674 rdev_for_each(rdev
, mddev
)
675 if (rdev
->desc_nr
== nr
)
681 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
683 struct md_rdev
*rdev
;
685 rdev_for_each_rcu(rdev
, mddev
)
686 if (rdev
->desc_nr
== nr
)
692 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
694 struct md_rdev
*rdev
;
696 rdev_for_each(rdev
, mddev
)
697 if (rdev
->bdev
->bd_dev
== dev
)
703 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
705 struct md_rdev
*rdev
;
707 rdev_for_each_rcu(rdev
, mddev
)
708 if (rdev
->bdev
->bd_dev
== dev
)
714 static struct md_personality
*find_pers(int level
, char *clevel
)
716 struct md_personality
*pers
;
717 list_for_each_entry(pers
, &pers_list
, list
) {
718 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
720 if (strcmp(pers
->name
, clevel
)==0)
726 /* return the offset of the super block in 512byte sectors */
727 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
729 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
730 return MD_NEW_SIZE_SECTORS(num_sectors
);
733 static int alloc_disk_sb(struct md_rdev
* rdev
)
738 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
739 if (!rdev
->sb_page
) {
740 printk(KERN_ALERT
"md: out of memory.\n");
747 void md_rdev_clear(struct md_rdev
*rdev
)
750 put_page(rdev
->sb_page
);
752 rdev
->sb_page
= NULL
;
757 put_page(rdev
->bb_page
);
758 rdev
->bb_page
= NULL
;
760 kfree(rdev
->badblocks
.page
);
761 rdev
->badblocks
.page
= NULL
;
763 EXPORT_SYMBOL_GPL(md_rdev_clear
);
765 static void super_written(struct bio
*bio
, int error
)
767 struct md_rdev
*rdev
= bio
->bi_private
;
768 struct mddev
*mddev
= rdev
->mddev
;
770 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
771 printk("md: super_written gets error=%d, uptodate=%d\n",
772 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
773 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
774 md_error(mddev
, rdev
);
777 if (atomic_dec_and_test(&mddev
->pending_writes
))
778 wake_up(&mddev
->sb_wait
);
782 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
783 sector_t sector
, int size
, struct page
*page
)
785 /* write first size bytes of page to sector of rdev
786 * Increment mddev->pending_writes before returning
787 * and decrement it on completion, waking up sb_wait
788 * if zero is reached.
789 * If an error occurred, call md_error
791 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
793 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
794 bio
->bi_sector
= sector
;
795 bio_add_page(bio
, page
, size
, 0);
796 bio
->bi_private
= rdev
;
797 bio
->bi_end_io
= super_written
;
799 atomic_inc(&mddev
->pending_writes
);
800 submit_bio(WRITE_FLUSH_FUA
, bio
);
803 void md_super_wait(struct mddev
*mddev
)
805 /* wait for all superblock writes that were scheduled to complete */
808 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
809 if (atomic_read(&mddev
->pending_writes
)==0)
813 finish_wait(&mddev
->sb_wait
, &wq
);
816 static void bi_complete(struct bio
*bio
, int error
)
818 complete((struct completion
*)bio
->bi_private
);
821 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
822 struct page
*page
, int rw
, bool metadata_op
)
824 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
825 struct completion event
;
830 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
831 rdev
->meta_bdev
: rdev
->bdev
;
833 bio
->bi_sector
= sector
+ rdev
->sb_start
;
834 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
835 (rdev
->mddev
->reshape_backwards
==
836 (sector
>= rdev
->mddev
->reshape_position
)))
837 bio
->bi_sector
= sector
+ rdev
->new_data_offset
;
839 bio
->bi_sector
= sector
+ rdev
->data_offset
;
840 bio_add_page(bio
, page
, size
, 0);
841 init_completion(&event
);
842 bio
->bi_private
= &event
;
843 bio
->bi_end_io
= bi_complete
;
845 wait_for_completion(&event
);
847 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
851 EXPORT_SYMBOL_GPL(sync_page_io
);
853 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
855 char b
[BDEVNAME_SIZE
];
856 if (!rdev
->sb_page
) {
864 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
870 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
871 bdevname(rdev
->bdev
,b
));
875 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
877 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
878 sb1
->set_uuid1
== sb2
->set_uuid1
&&
879 sb1
->set_uuid2
== sb2
->set_uuid2
&&
880 sb1
->set_uuid3
== sb2
->set_uuid3
;
883 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
886 mdp_super_t
*tmp1
, *tmp2
;
888 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
889 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
891 if (!tmp1
|| !tmp2
) {
893 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
901 * nr_disks is not constant
906 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
914 static u32
md_csum_fold(u32 csum
)
916 csum
= (csum
& 0xffff) + (csum
>> 16);
917 return (csum
& 0xffff) + (csum
>> 16);
920 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
923 u32
*sb32
= (u32
*)sb
;
925 unsigned int disk_csum
, csum
;
927 disk_csum
= sb
->sb_csum
;
930 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
932 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
936 /* This used to use csum_partial, which was wrong for several
937 * reasons including that different results are returned on
938 * different architectures. It isn't critical that we get exactly
939 * the same return value as before (we always csum_fold before
940 * testing, and that removes any differences). However as we
941 * know that csum_partial always returned a 16bit value on
942 * alphas, do a fold to maximise conformity to previous behaviour.
944 sb
->sb_csum
= md_csum_fold(disk_csum
);
946 sb
->sb_csum
= disk_csum
;
953 * Handle superblock details.
954 * We want to be able to handle multiple superblock formats
955 * so we have a common interface to them all, and an array of
956 * different handlers.
957 * We rely on user-space to write the initial superblock, and support
958 * reading and updating of superblocks.
959 * Interface methods are:
960 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
961 * loads and validates a superblock on dev.
962 * if refdev != NULL, compare superblocks on both devices
964 * 0 - dev has a superblock that is compatible with refdev
965 * 1 - dev has a superblock that is compatible and newer than refdev
966 * so dev should be used as the refdev in future
967 * -EINVAL superblock incompatible or invalid
968 * -othererror e.g. -EIO
970 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
971 * Verify that dev is acceptable into mddev.
972 * The first time, mddev->raid_disks will be 0, and data from
973 * dev should be merged in. Subsequent calls check that dev
974 * is new enough. Return 0 or -EINVAL
976 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
977 * Update the superblock for rdev with data in mddev
978 * This does not write to disc.
984 struct module
*owner
;
985 int (*load_super
)(struct md_rdev
*rdev
,
986 struct md_rdev
*refdev
,
988 int (*validate_super
)(struct mddev
*mddev
,
989 struct md_rdev
*rdev
);
990 void (*sync_super
)(struct mddev
*mddev
,
991 struct md_rdev
*rdev
);
992 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
993 sector_t num_sectors
);
994 int (*allow_new_offset
)(struct md_rdev
*rdev
,
995 unsigned long long new_offset
);
999 * Check that the given mddev has no bitmap.
1001 * This function is called from the run method of all personalities that do not
1002 * support bitmaps. It prints an error message and returns non-zero if mddev
1003 * has a bitmap. Otherwise, it returns 0.
1006 int md_check_no_bitmap(struct mddev
*mddev
)
1008 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1010 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1011 mdname(mddev
), mddev
->pers
->name
);
1014 EXPORT_SYMBOL(md_check_no_bitmap
);
1017 * load_super for 0.90.0
1019 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1021 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1026 * Calculate the position of the superblock (512byte sectors),
1027 * it's at the end of the disk.
1029 * It also happens to be a multiple of 4Kb.
1031 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1033 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1034 if (ret
) return ret
;
1038 bdevname(rdev
->bdev
, b
);
1039 sb
= page_address(rdev
->sb_page
);
1041 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1042 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1047 if (sb
->major_version
!= 0 ||
1048 sb
->minor_version
< 90 ||
1049 sb
->minor_version
> 91) {
1050 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1051 sb
->major_version
, sb
->minor_version
,
1056 if (sb
->raid_disks
<= 0)
1059 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1060 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1065 rdev
->preferred_minor
= sb
->md_minor
;
1066 rdev
->data_offset
= 0;
1067 rdev
->new_data_offset
= 0;
1068 rdev
->sb_size
= MD_SB_BYTES
;
1069 rdev
->badblocks
.shift
= -1;
1071 if (sb
->level
== LEVEL_MULTIPATH
)
1074 rdev
->desc_nr
= sb
->this_disk
.number
;
1080 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1081 if (!uuid_equal(refsb
, sb
)) {
1082 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1083 b
, bdevname(refdev
->bdev
,b2
));
1086 if (!sb_equal(refsb
, sb
)) {
1087 printk(KERN_WARNING
"md: %s has same UUID"
1088 " but different superblock to %s\n",
1089 b
, bdevname(refdev
->bdev
, b2
));
1093 ev2
= md_event(refsb
);
1099 rdev
->sectors
= rdev
->sb_start
;
1100 /* Limit to 4TB as metadata cannot record more than that.
1101 * (not needed for Linear and RAID0 as metadata doesn't
1104 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1105 rdev
->sectors
= (2ULL << 32) - 2;
1107 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1108 /* "this cannot possibly happen" ... */
1116 * validate_super for 0.90.0
1118 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1121 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1122 __u64 ev1
= md_event(sb
);
1124 rdev
->raid_disk
= -1;
1125 clear_bit(Faulty
, &rdev
->flags
);
1126 clear_bit(In_sync
, &rdev
->flags
);
1127 clear_bit(WriteMostly
, &rdev
->flags
);
1129 if (mddev
->raid_disks
== 0) {
1130 mddev
->major_version
= 0;
1131 mddev
->minor_version
= sb
->minor_version
;
1132 mddev
->patch_version
= sb
->patch_version
;
1133 mddev
->external
= 0;
1134 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1135 mddev
->ctime
= sb
->ctime
;
1136 mddev
->utime
= sb
->utime
;
1137 mddev
->level
= sb
->level
;
1138 mddev
->clevel
[0] = 0;
1139 mddev
->layout
= sb
->layout
;
1140 mddev
->raid_disks
= sb
->raid_disks
;
1141 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1142 mddev
->events
= ev1
;
1143 mddev
->bitmap_info
.offset
= 0;
1144 mddev
->bitmap_info
.space
= 0;
1145 /* bitmap can use 60 K after the 4K superblocks */
1146 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1147 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1148 mddev
->reshape_backwards
= 0;
1150 if (mddev
->minor_version
>= 91) {
1151 mddev
->reshape_position
= sb
->reshape_position
;
1152 mddev
->delta_disks
= sb
->delta_disks
;
1153 mddev
->new_level
= sb
->new_level
;
1154 mddev
->new_layout
= sb
->new_layout
;
1155 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1156 if (mddev
->delta_disks
< 0)
1157 mddev
->reshape_backwards
= 1;
1159 mddev
->reshape_position
= MaxSector
;
1160 mddev
->delta_disks
= 0;
1161 mddev
->new_level
= mddev
->level
;
1162 mddev
->new_layout
= mddev
->layout
;
1163 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1166 if (sb
->state
& (1<<MD_SB_CLEAN
))
1167 mddev
->recovery_cp
= MaxSector
;
1169 if (sb
->events_hi
== sb
->cp_events_hi
&&
1170 sb
->events_lo
== sb
->cp_events_lo
) {
1171 mddev
->recovery_cp
= sb
->recovery_cp
;
1173 mddev
->recovery_cp
= 0;
1176 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1177 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1178 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1179 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1181 mddev
->max_disks
= MD_SB_DISKS
;
1183 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1184 mddev
->bitmap_info
.file
== NULL
) {
1185 mddev
->bitmap_info
.offset
=
1186 mddev
->bitmap_info
.default_offset
;
1187 mddev
->bitmap_info
.space
=
1188 mddev
->bitmap_info
.space
;
1191 } else if (mddev
->pers
== NULL
) {
1192 /* Insist on good event counter while assembling, except
1193 * for spares (which don't need an event count) */
1195 if (sb
->disks
[rdev
->desc_nr
].state
& (
1196 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1197 if (ev1
< mddev
->events
)
1199 } else if (mddev
->bitmap
) {
1200 /* if adding to array with a bitmap, then we can accept an
1201 * older device ... but not too old.
1203 if (ev1
< mddev
->bitmap
->events_cleared
)
1206 if (ev1
< mddev
->events
)
1207 /* just a hot-add of a new device, leave raid_disk at -1 */
1211 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1212 desc
= sb
->disks
+ rdev
->desc_nr
;
1214 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1215 set_bit(Faulty
, &rdev
->flags
);
1216 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1217 desc->raid_disk < mddev->raid_disks */) {
1218 set_bit(In_sync
, &rdev
->flags
);
1219 rdev
->raid_disk
= desc
->raid_disk
;
1220 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1221 /* active but not in sync implies recovery up to
1222 * reshape position. We don't know exactly where
1223 * that is, so set to zero for now */
1224 if (mddev
->minor_version
>= 91) {
1225 rdev
->recovery_offset
= 0;
1226 rdev
->raid_disk
= desc
->raid_disk
;
1229 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1230 set_bit(WriteMostly
, &rdev
->flags
);
1231 } else /* MULTIPATH are always insync */
1232 set_bit(In_sync
, &rdev
->flags
);
1237 * sync_super for 0.90.0
1239 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1242 struct md_rdev
*rdev2
;
1243 int next_spare
= mddev
->raid_disks
;
1246 /* make rdev->sb match mddev data..
1249 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1250 * 3/ any empty disks < next_spare become removed
1252 * disks[0] gets initialised to REMOVED because
1253 * we cannot be sure from other fields if it has
1254 * been initialised or not.
1257 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1259 rdev
->sb_size
= MD_SB_BYTES
;
1261 sb
= page_address(rdev
->sb_page
);
1263 memset(sb
, 0, sizeof(*sb
));
1265 sb
->md_magic
= MD_SB_MAGIC
;
1266 sb
->major_version
= mddev
->major_version
;
1267 sb
->patch_version
= mddev
->patch_version
;
1268 sb
->gvalid_words
= 0; /* ignored */
1269 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1270 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1271 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1272 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1274 sb
->ctime
= mddev
->ctime
;
1275 sb
->level
= mddev
->level
;
1276 sb
->size
= mddev
->dev_sectors
/ 2;
1277 sb
->raid_disks
= mddev
->raid_disks
;
1278 sb
->md_minor
= mddev
->md_minor
;
1279 sb
->not_persistent
= 0;
1280 sb
->utime
= mddev
->utime
;
1282 sb
->events_hi
= (mddev
->events
>>32);
1283 sb
->events_lo
= (u32
)mddev
->events
;
1285 if (mddev
->reshape_position
== MaxSector
)
1286 sb
->minor_version
= 90;
1288 sb
->minor_version
= 91;
1289 sb
->reshape_position
= mddev
->reshape_position
;
1290 sb
->new_level
= mddev
->new_level
;
1291 sb
->delta_disks
= mddev
->delta_disks
;
1292 sb
->new_layout
= mddev
->new_layout
;
1293 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1295 mddev
->minor_version
= sb
->minor_version
;
1298 sb
->recovery_cp
= mddev
->recovery_cp
;
1299 sb
->cp_events_hi
= (mddev
->events
>>32);
1300 sb
->cp_events_lo
= (u32
)mddev
->events
;
1301 if (mddev
->recovery_cp
== MaxSector
)
1302 sb
->state
= (1<< MD_SB_CLEAN
);
1304 sb
->recovery_cp
= 0;
1306 sb
->layout
= mddev
->layout
;
1307 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1309 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1310 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1312 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1313 rdev_for_each(rdev2
, mddev
) {
1316 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1318 if (rdev2
->raid_disk
>= 0 &&
1319 sb
->minor_version
>= 91)
1320 /* we have nowhere to store the recovery_offset,
1321 * but if it is not below the reshape_position,
1322 * we can piggy-back on that.
1325 if (rdev2
->raid_disk
< 0 ||
1326 test_bit(Faulty
, &rdev2
->flags
))
1329 desc_nr
= rdev2
->raid_disk
;
1331 desc_nr
= next_spare
++;
1332 rdev2
->desc_nr
= desc_nr
;
1333 d
= &sb
->disks
[rdev2
->desc_nr
];
1335 d
->number
= rdev2
->desc_nr
;
1336 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1337 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1339 d
->raid_disk
= rdev2
->raid_disk
;
1341 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1342 if (test_bit(Faulty
, &rdev2
->flags
))
1343 d
->state
= (1<<MD_DISK_FAULTY
);
1344 else if (is_active
) {
1345 d
->state
= (1<<MD_DISK_ACTIVE
);
1346 if (test_bit(In_sync
, &rdev2
->flags
))
1347 d
->state
|= (1<<MD_DISK_SYNC
);
1355 if (test_bit(WriteMostly
, &rdev2
->flags
))
1356 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1358 /* now set the "removed" and "faulty" bits on any missing devices */
1359 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1360 mdp_disk_t
*d
= &sb
->disks
[i
];
1361 if (d
->state
== 0 && d
->number
== 0) {
1364 d
->state
= (1<<MD_DISK_REMOVED
);
1365 d
->state
|= (1<<MD_DISK_FAULTY
);
1369 sb
->nr_disks
= nr_disks
;
1370 sb
->active_disks
= active
;
1371 sb
->working_disks
= working
;
1372 sb
->failed_disks
= failed
;
1373 sb
->spare_disks
= spare
;
1375 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1376 sb
->sb_csum
= calc_sb_csum(sb
);
1380 * rdev_size_change for 0.90.0
1382 static unsigned long long
1383 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1385 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1386 return 0; /* component must fit device */
1387 if (rdev
->mddev
->bitmap_info
.offset
)
1388 return 0; /* can't move bitmap */
1389 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1390 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1391 num_sectors
= rdev
->sb_start
;
1392 /* Limit to 4TB as metadata cannot record more than that.
1393 * 4TB == 2^32 KB, or 2*2^32 sectors.
1395 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1396 num_sectors
= (2ULL << 32) - 2;
1397 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1399 md_super_wait(rdev
->mddev
);
1404 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1406 /* non-zero offset changes not possible with v0.90 */
1407 return new_offset
== 0;
1411 * version 1 superblock
1414 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1418 unsigned long long newcsum
;
1419 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1420 __le32
*isuper
= (__le32
*)sb
;
1422 disk_csum
= sb
->sb_csum
;
1425 for (; size
>= 4; size
-= 4)
1426 newcsum
+= le32_to_cpu(*isuper
++);
1429 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1431 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1432 sb
->sb_csum
= disk_csum
;
1433 return cpu_to_le32(csum
);
1436 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1438 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1440 struct mdp_superblock_1
*sb
;
1444 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1448 * Calculate the position of the superblock in 512byte sectors.
1449 * It is always aligned to a 4K boundary and
1450 * depeding on minor_version, it can be:
1451 * 0: At least 8K, but less than 12K, from end of device
1452 * 1: At start of device
1453 * 2: 4K from start of device.
1455 switch(minor_version
) {
1457 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1459 sb_start
&= ~(sector_t
)(4*2-1);
1470 rdev
->sb_start
= sb_start
;
1472 /* superblock is rarely larger than 1K, but it can be larger,
1473 * and it is safe to read 4k, so we do that
1475 ret
= read_disk_sb(rdev
, 4096);
1476 if (ret
) return ret
;
1479 sb
= page_address(rdev
->sb_page
);
1481 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1482 sb
->major_version
!= cpu_to_le32(1) ||
1483 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1484 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1485 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1488 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1489 printk("md: invalid superblock checksum on %s\n",
1490 bdevname(rdev
->bdev
,b
));
1493 if (le64_to_cpu(sb
->data_size
) < 10) {
1494 printk("md: data_size too small on %s\n",
1495 bdevname(rdev
->bdev
,b
));
1500 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1501 /* Some padding is non-zero, might be a new feature */
1504 rdev
->preferred_minor
= 0xffff;
1505 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1506 rdev
->new_data_offset
= rdev
->data_offset
;
1507 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1508 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1509 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1510 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1512 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1513 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1514 if (rdev
->sb_size
& bmask
)
1515 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1518 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1521 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1524 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1527 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1529 if (!rdev
->bb_page
) {
1530 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1534 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1535 rdev
->badblocks
.count
== 0) {
1536 /* need to load the bad block list.
1537 * Currently we limit it to one page.
1543 int sectors
= le16_to_cpu(sb
->bblog_size
);
1544 if (sectors
> (PAGE_SIZE
/ 512))
1546 offset
= le32_to_cpu(sb
->bblog_offset
);
1549 bb_sector
= (long long)offset
;
1550 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1551 rdev
->bb_page
, READ
, true))
1553 bbp
= (u64
*)page_address(rdev
->bb_page
);
1554 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1555 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1556 u64 bb
= le64_to_cpu(*bbp
);
1557 int count
= bb
& (0x3ff);
1558 u64 sector
= bb
>> 10;
1559 sector
<<= sb
->bblog_shift
;
1560 count
<<= sb
->bblog_shift
;
1563 if (md_set_badblocks(&rdev
->badblocks
,
1564 sector
, count
, 1) == 0)
1567 } else if (sb
->bblog_offset
== 0)
1568 rdev
->badblocks
.shift
= -1;
1574 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1576 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1577 sb
->level
!= refsb
->level
||
1578 sb
->layout
!= refsb
->layout
||
1579 sb
->chunksize
!= refsb
->chunksize
) {
1580 printk(KERN_WARNING
"md: %s has strangely different"
1581 " superblock to %s\n",
1582 bdevname(rdev
->bdev
,b
),
1583 bdevname(refdev
->bdev
,b2
));
1586 ev1
= le64_to_cpu(sb
->events
);
1587 ev2
= le64_to_cpu(refsb
->events
);
1594 if (minor_version
) {
1595 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1596 sectors
-= rdev
->data_offset
;
1598 sectors
= rdev
->sb_start
;
1599 if (sectors
< le64_to_cpu(sb
->data_size
))
1601 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1605 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1607 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1608 __u64 ev1
= le64_to_cpu(sb
->events
);
1610 rdev
->raid_disk
= -1;
1611 clear_bit(Faulty
, &rdev
->flags
);
1612 clear_bit(In_sync
, &rdev
->flags
);
1613 clear_bit(WriteMostly
, &rdev
->flags
);
1615 if (mddev
->raid_disks
== 0) {
1616 mddev
->major_version
= 1;
1617 mddev
->patch_version
= 0;
1618 mddev
->external
= 0;
1619 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1620 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1621 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1622 mddev
->level
= le32_to_cpu(sb
->level
);
1623 mddev
->clevel
[0] = 0;
1624 mddev
->layout
= le32_to_cpu(sb
->layout
);
1625 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1626 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1627 mddev
->events
= ev1
;
1628 mddev
->bitmap_info
.offset
= 0;
1629 mddev
->bitmap_info
.space
= 0;
1630 /* Default location for bitmap is 1K after superblock
1631 * using 3K - total of 4K
1633 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1634 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1635 mddev
->reshape_backwards
= 0;
1637 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1638 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1640 mddev
->max_disks
= (4096-256)/2;
1642 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1643 mddev
->bitmap_info
.file
== NULL
) {
1644 mddev
->bitmap_info
.offset
=
1645 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1646 /* Metadata doesn't record how much space is available.
1647 * For 1.0, we assume we can use up to the superblock
1648 * if before, else to 4K beyond superblock.
1649 * For others, assume no change is possible.
1651 if (mddev
->minor_version
> 0)
1652 mddev
->bitmap_info
.space
= 0;
1653 else if (mddev
->bitmap_info
.offset
> 0)
1654 mddev
->bitmap_info
.space
=
1655 8 - mddev
->bitmap_info
.offset
;
1657 mddev
->bitmap_info
.space
=
1658 -mddev
->bitmap_info
.offset
;
1661 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1662 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1663 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1664 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1665 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1666 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1667 if (mddev
->delta_disks
< 0 ||
1668 (mddev
->delta_disks
== 0 &&
1669 (le32_to_cpu(sb
->feature_map
)
1670 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1671 mddev
->reshape_backwards
= 1;
1673 mddev
->reshape_position
= MaxSector
;
1674 mddev
->delta_disks
= 0;
1675 mddev
->new_level
= mddev
->level
;
1676 mddev
->new_layout
= mddev
->layout
;
1677 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1680 } else if (mddev
->pers
== NULL
) {
1681 /* Insist of good event counter while assembling, except for
1682 * spares (which don't need an event count) */
1684 if (rdev
->desc_nr
>= 0 &&
1685 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1686 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1687 if (ev1
< mddev
->events
)
1689 } else if (mddev
->bitmap
) {
1690 /* If adding to array with a bitmap, then we can accept an
1691 * older device, but not too old.
1693 if (ev1
< mddev
->bitmap
->events_cleared
)
1696 if (ev1
< mddev
->events
)
1697 /* just a hot-add of a new device, leave raid_disk at -1 */
1700 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1702 if (rdev
->desc_nr
< 0 ||
1703 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1707 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1709 case 0xffff: /* spare */
1711 case 0xfffe: /* faulty */
1712 set_bit(Faulty
, &rdev
->flags
);
1715 if ((le32_to_cpu(sb
->feature_map
) &
1716 MD_FEATURE_RECOVERY_OFFSET
))
1717 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1719 set_bit(In_sync
, &rdev
->flags
);
1720 rdev
->raid_disk
= role
;
1723 if (sb
->devflags
& WriteMostly1
)
1724 set_bit(WriteMostly
, &rdev
->flags
);
1725 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1726 set_bit(Replacement
, &rdev
->flags
);
1727 } else /* MULTIPATH are always insync */
1728 set_bit(In_sync
, &rdev
->flags
);
1733 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1735 struct mdp_superblock_1
*sb
;
1736 struct md_rdev
*rdev2
;
1738 /* make rdev->sb match mddev and rdev data. */
1740 sb
= page_address(rdev
->sb_page
);
1742 sb
->feature_map
= 0;
1744 sb
->recovery_offset
= cpu_to_le64(0);
1745 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1747 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1748 sb
->events
= cpu_to_le64(mddev
->events
);
1750 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1752 sb
->resync_offset
= cpu_to_le64(0);
1754 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1756 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1757 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1758 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1759 sb
->level
= cpu_to_le32(mddev
->level
);
1760 sb
->layout
= cpu_to_le32(mddev
->layout
);
1762 if (test_bit(WriteMostly
, &rdev
->flags
))
1763 sb
->devflags
|= WriteMostly1
;
1765 sb
->devflags
&= ~WriteMostly1
;
1766 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1767 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1769 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1770 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1771 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1774 if (rdev
->raid_disk
>= 0 &&
1775 !test_bit(In_sync
, &rdev
->flags
)) {
1777 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1778 sb
->recovery_offset
=
1779 cpu_to_le64(rdev
->recovery_offset
);
1781 if (test_bit(Replacement
, &rdev
->flags
))
1783 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1785 if (mddev
->reshape_position
!= MaxSector
) {
1786 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1787 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1788 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1789 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1790 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1791 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1792 if (mddev
->delta_disks
== 0 &&
1793 mddev
->reshape_backwards
)
1795 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1796 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1798 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1799 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1800 - rdev
->data_offset
));
1804 if (rdev
->badblocks
.count
== 0)
1805 /* Nothing to do for bad blocks*/ ;
1806 else if (sb
->bblog_offset
== 0)
1807 /* Cannot record bad blocks on this device */
1808 md_error(mddev
, rdev
);
1810 struct badblocks
*bb
= &rdev
->badblocks
;
1811 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1813 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1818 seq
= read_seqbegin(&bb
->lock
);
1820 memset(bbp
, 0xff, PAGE_SIZE
);
1822 for (i
= 0 ; i
< bb
->count
; i
++) {
1823 u64 internal_bb
= p
[i
];
1824 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1825 | BB_LEN(internal_bb
));
1826 bbp
[i
] = cpu_to_le64(store_bb
);
1829 if (read_seqretry(&bb
->lock
, seq
))
1832 bb
->sector
= (rdev
->sb_start
+
1833 (int)le32_to_cpu(sb
->bblog_offset
));
1834 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1839 rdev_for_each(rdev2
, mddev
)
1840 if (rdev2
->desc_nr
+1 > max_dev
)
1841 max_dev
= rdev2
->desc_nr
+1;
1843 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1845 sb
->max_dev
= cpu_to_le32(max_dev
);
1846 rdev
->sb_size
= max_dev
* 2 + 256;
1847 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1848 if (rdev
->sb_size
& bmask
)
1849 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1851 max_dev
= le32_to_cpu(sb
->max_dev
);
1853 for (i
=0; i
<max_dev
;i
++)
1854 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1856 rdev_for_each(rdev2
, mddev
) {
1858 if (test_bit(Faulty
, &rdev2
->flags
))
1859 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1860 else if (test_bit(In_sync
, &rdev2
->flags
))
1861 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1862 else if (rdev2
->raid_disk
>= 0)
1863 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1865 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1868 sb
->sb_csum
= calc_sb_1_csum(sb
);
1871 static unsigned long long
1872 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1874 struct mdp_superblock_1
*sb
;
1875 sector_t max_sectors
;
1876 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1877 return 0; /* component must fit device */
1878 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1879 return 0; /* too confusing */
1880 if (rdev
->sb_start
< rdev
->data_offset
) {
1881 /* minor versions 1 and 2; superblock before data */
1882 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1883 max_sectors
-= rdev
->data_offset
;
1884 if (!num_sectors
|| num_sectors
> max_sectors
)
1885 num_sectors
= max_sectors
;
1886 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1887 /* minor version 0 with bitmap we can't move */
1890 /* minor version 0; superblock after data */
1892 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1893 sb_start
&= ~(sector_t
)(4*2 - 1);
1894 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1895 if (!num_sectors
|| num_sectors
> max_sectors
)
1896 num_sectors
= max_sectors
;
1897 rdev
->sb_start
= sb_start
;
1899 sb
= page_address(rdev
->sb_page
);
1900 sb
->data_size
= cpu_to_le64(num_sectors
);
1901 sb
->super_offset
= rdev
->sb_start
;
1902 sb
->sb_csum
= calc_sb_1_csum(sb
);
1903 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1905 md_super_wait(rdev
->mddev
);
1911 super_1_allow_new_offset(struct md_rdev
*rdev
,
1912 unsigned long long new_offset
)
1914 /* All necessary checks on new >= old have been done */
1915 struct bitmap
*bitmap
;
1916 if (new_offset
>= rdev
->data_offset
)
1919 /* with 1.0 metadata, there is no metadata to tread on
1920 * so we can always move back */
1921 if (rdev
->mddev
->minor_version
== 0)
1924 /* otherwise we must be sure not to step on
1925 * any metadata, so stay:
1926 * 36K beyond start of superblock
1927 * beyond end of badblocks
1928 * beyond write-intent bitmap
1930 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1932 bitmap
= rdev
->mddev
->bitmap
;
1933 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1934 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1935 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1937 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1943 static struct super_type super_types
[] = {
1946 .owner
= THIS_MODULE
,
1947 .load_super
= super_90_load
,
1948 .validate_super
= super_90_validate
,
1949 .sync_super
= super_90_sync
,
1950 .rdev_size_change
= super_90_rdev_size_change
,
1951 .allow_new_offset
= super_90_allow_new_offset
,
1955 .owner
= THIS_MODULE
,
1956 .load_super
= super_1_load
,
1957 .validate_super
= super_1_validate
,
1958 .sync_super
= super_1_sync
,
1959 .rdev_size_change
= super_1_rdev_size_change
,
1960 .allow_new_offset
= super_1_allow_new_offset
,
1964 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1966 if (mddev
->sync_super
) {
1967 mddev
->sync_super(mddev
, rdev
);
1971 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1973 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1976 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1978 struct md_rdev
*rdev
, *rdev2
;
1981 rdev_for_each_rcu(rdev
, mddev1
)
1982 rdev_for_each_rcu(rdev2
, mddev2
)
1983 if (rdev
->bdev
->bd_contains
==
1984 rdev2
->bdev
->bd_contains
) {
1992 static LIST_HEAD(pending_raid_disks
);
1995 * Try to register data integrity profile for an mddev
1997 * This is called when an array is started and after a disk has been kicked
1998 * from the array. It only succeeds if all working and active component devices
1999 * are integrity capable with matching profiles.
2001 int md_integrity_register(struct mddev
*mddev
)
2003 struct md_rdev
*rdev
, *reference
= NULL
;
2005 if (list_empty(&mddev
->disks
))
2006 return 0; /* nothing to do */
2007 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2008 return 0; /* shouldn't register, or already is */
2009 rdev_for_each(rdev
, mddev
) {
2010 /* skip spares and non-functional disks */
2011 if (test_bit(Faulty
, &rdev
->flags
))
2013 if (rdev
->raid_disk
< 0)
2016 /* Use the first rdev as the reference */
2020 /* does this rdev's profile match the reference profile? */
2021 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2022 rdev
->bdev
->bd_disk
) < 0)
2025 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2028 * All component devices are integrity capable and have matching
2029 * profiles, register the common profile for the md device.
2031 if (blk_integrity_register(mddev
->gendisk
,
2032 bdev_get_integrity(reference
->bdev
)) != 0) {
2033 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2037 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2038 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2039 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2045 EXPORT_SYMBOL(md_integrity_register
);
2047 /* Disable data integrity if non-capable/non-matching disk is being added */
2048 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2050 struct blk_integrity
*bi_rdev
;
2051 struct blk_integrity
*bi_mddev
;
2053 if (!mddev
->gendisk
)
2056 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2057 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2059 if (!bi_mddev
) /* nothing to do */
2061 if (rdev
->raid_disk
< 0) /* skip spares */
2063 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2064 rdev
->bdev
->bd_disk
) >= 0)
2066 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2067 blk_integrity_unregister(mddev
->gendisk
);
2069 EXPORT_SYMBOL(md_integrity_add_rdev
);
2071 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2073 char b
[BDEVNAME_SIZE
];
2083 /* prevent duplicates */
2084 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2087 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2088 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2089 rdev
->sectors
< mddev
->dev_sectors
)) {
2091 /* Cannot change size, so fail
2092 * If mddev->level <= 0, then we don't care
2093 * about aligning sizes (e.g. linear)
2095 if (mddev
->level
> 0)
2098 mddev
->dev_sectors
= rdev
->sectors
;
2101 /* Verify rdev->desc_nr is unique.
2102 * If it is -1, assign a free number, else
2103 * check number is not in use
2105 if (rdev
->desc_nr
< 0) {
2107 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2108 while (find_rdev_nr(mddev
, choice
))
2110 rdev
->desc_nr
= choice
;
2112 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2115 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2116 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2117 mdname(mddev
), mddev
->max_disks
);
2120 bdevname(rdev
->bdev
,b
);
2121 while ( (s
=strchr(b
, '/')) != NULL
)
2124 rdev
->mddev
= mddev
;
2125 printk(KERN_INFO
"md: bind<%s>\n", b
);
2127 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2130 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2131 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2132 /* failure here is OK */;
2133 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2135 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2136 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2138 /* May as well allow recovery to be retried once */
2139 mddev
->recovery_disabled
++;
2144 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2149 static void md_delayed_delete(struct work_struct
*ws
)
2151 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2152 kobject_del(&rdev
->kobj
);
2153 kobject_put(&rdev
->kobj
);
2156 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2158 char b
[BDEVNAME_SIZE
];
2163 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2164 list_del_rcu(&rdev
->same_set
);
2165 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2167 sysfs_remove_link(&rdev
->kobj
, "block");
2168 sysfs_put(rdev
->sysfs_state
);
2169 rdev
->sysfs_state
= NULL
;
2170 rdev
->badblocks
.count
= 0;
2171 /* We need to delay this, otherwise we can deadlock when
2172 * writing to 'remove' to "dev/state". We also need
2173 * to delay it due to rcu usage.
2176 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2177 kobject_get(&rdev
->kobj
);
2178 queue_work(md_misc_wq
, &rdev
->del_work
);
2182 * prevent the device from being mounted, repartitioned or
2183 * otherwise reused by a RAID array (or any other kernel
2184 * subsystem), by bd_claiming the device.
2186 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2189 struct block_device
*bdev
;
2190 char b
[BDEVNAME_SIZE
];
2192 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2193 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2195 printk(KERN_ERR
"md: could not open %s.\n",
2196 __bdevname(dev
, b
));
2197 return PTR_ERR(bdev
);
2203 static void unlock_rdev(struct md_rdev
*rdev
)
2205 struct block_device
*bdev
= rdev
->bdev
;
2209 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2212 void md_autodetect_dev(dev_t dev
);
2214 static void export_rdev(struct md_rdev
* rdev
)
2216 char b
[BDEVNAME_SIZE
];
2217 printk(KERN_INFO
"md: export_rdev(%s)\n",
2218 bdevname(rdev
->bdev
,b
));
2221 md_rdev_clear(rdev
);
2223 if (test_bit(AutoDetected
, &rdev
->flags
))
2224 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2227 kobject_put(&rdev
->kobj
);
2230 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2232 unbind_rdev_from_array(rdev
);
2236 static void export_array(struct mddev
*mddev
)
2238 struct md_rdev
*rdev
, *tmp
;
2240 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2245 kick_rdev_from_array(rdev
);
2247 if (!list_empty(&mddev
->disks
))
2249 mddev
->raid_disks
= 0;
2250 mddev
->major_version
= 0;
2253 static void print_desc(mdp_disk_t
*desc
)
2255 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2256 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2259 static void print_sb_90(mdp_super_t
*sb
)
2264 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2265 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2266 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2268 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2269 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2270 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2271 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2272 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2273 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2274 sb
->failed_disks
, sb
->spare_disks
,
2275 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2278 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2281 desc
= sb
->disks
+ i
;
2282 if (desc
->number
|| desc
->major
|| desc
->minor
||
2283 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2284 printk(" D %2d: ", i
);
2288 printk(KERN_INFO
"md: THIS: ");
2289 print_desc(&sb
->this_disk
);
2292 static void print_sb_1(struct mdp_superblock_1
*sb
)
2296 uuid
= sb
->set_uuid
;
2298 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2299 "md: Name: \"%s\" CT:%llu\n",
2300 le32_to_cpu(sb
->major_version
),
2301 le32_to_cpu(sb
->feature_map
),
2304 (unsigned long long)le64_to_cpu(sb
->ctime
)
2305 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2307 uuid
= sb
->device_uuid
;
2309 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2311 "md: Dev:%08x UUID: %pU\n"
2312 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2313 "md: (MaxDev:%u) \n",
2314 le32_to_cpu(sb
->level
),
2315 (unsigned long long)le64_to_cpu(sb
->size
),
2316 le32_to_cpu(sb
->raid_disks
),
2317 le32_to_cpu(sb
->layout
),
2318 le32_to_cpu(sb
->chunksize
),
2319 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2320 (unsigned long long)le64_to_cpu(sb
->data_size
),
2321 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2322 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2323 le32_to_cpu(sb
->dev_number
),
2326 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2327 (unsigned long long)le64_to_cpu(sb
->events
),
2328 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2329 le32_to_cpu(sb
->sb_csum
),
2330 le32_to_cpu(sb
->max_dev
)
2334 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2336 char b
[BDEVNAME_SIZE
];
2337 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2338 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2339 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2341 if (rdev
->sb_loaded
) {
2342 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2343 switch (major_version
) {
2345 print_sb_90(page_address(rdev
->sb_page
));
2348 print_sb_1(page_address(rdev
->sb_page
));
2352 printk(KERN_INFO
"md: no rdev superblock!\n");
2355 static void md_print_devices(void)
2357 struct list_head
*tmp
;
2358 struct md_rdev
*rdev
;
2359 struct mddev
*mddev
;
2360 char b
[BDEVNAME_SIZE
];
2363 printk("md: **********************************\n");
2364 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2365 printk("md: **********************************\n");
2366 for_each_mddev(mddev
, tmp
) {
2369 bitmap_print_sb(mddev
->bitmap
);
2371 printk("%s: ", mdname(mddev
));
2372 rdev_for_each(rdev
, mddev
)
2373 printk("<%s>", bdevname(rdev
->bdev
,b
));
2376 rdev_for_each(rdev
, mddev
)
2377 print_rdev(rdev
, mddev
->major_version
);
2379 printk("md: **********************************\n");
2384 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2386 /* Update each superblock (in-memory image), but
2387 * if we are allowed to, skip spares which already
2388 * have the right event counter, or have one earlier
2389 * (which would mean they aren't being marked as dirty
2390 * with the rest of the array)
2392 struct md_rdev
*rdev
;
2393 rdev_for_each(rdev
, mddev
) {
2394 if (rdev
->sb_events
== mddev
->events
||
2396 rdev
->raid_disk
< 0 &&
2397 rdev
->sb_events
+1 == mddev
->events
)) {
2398 /* Don't update this superblock */
2399 rdev
->sb_loaded
= 2;
2401 sync_super(mddev
, rdev
);
2402 rdev
->sb_loaded
= 1;
2407 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2409 struct md_rdev
*rdev
;
2412 int any_badblocks_changed
= 0;
2415 /* First make sure individual recovery_offsets are correct */
2416 rdev_for_each(rdev
, mddev
) {
2417 if (rdev
->raid_disk
>= 0 &&
2418 mddev
->delta_disks
>= 0 &&
2419 !test_bit(In_sync
, &rdev
->flags
) &&
2420 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2421 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2424 if (!mddev
->persistent
) {
2425 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2426 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2427 if (!mddev
->external
) {
2428 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2429 rdev_for_each(rdev
, mddev
) {
2430 if (rdev
->badblocks
.changed
) {
2431 rdev
->badblocks
.changed
= 0;
2432 md_ack_all_badblocks(&rdev
->badblocks
);
2433 md_error(mddev
, rdev
);
2435 clear_bit(Blocked
, &rdev
->flags
);
2436 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2437 wake_up(&rdev
->blocked_wait
);
2440 wake_up(&mddev
->sb_wait
);
2444 spin_lock_irq(&mddev
->write_lock
);
2446 mddev
->utime
= get_seconds();
2448 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2450 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2451 /* just a clean<-> dirty transition, possibly leave spares alone,
2452 * though if events isn't the right even/odd, we will have to do
2458 if (mddev
->degraded
)
2459 /* If the array is degraded, then skipping spares is both
2460 * dangerous and fairly pointless.
2461 * Dangerous because a device that was removed from the array
2462 * might have a event_count that still looks up-to-date,
2463 * so it can be re-added without a resync.
2464 * Pointless because if there are any spares to skip,
2465 * then a recovery will happen and soon that array won't
2466 * be degraded any more and the spare can go back to sleep then.
2470 sync_req
= mddev
->in_sync
;
2472 /* If this is just a dirty<->clean transition, and the array is clean
2473 * and 'events' is odd, we can roll back to the previous clean state */
2475 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2476 && mddev
->can_decrease_events
2477 && mddev
->events
!= 1) {
2479 mddev
->can_decrease_events
= 0;
2481 /* otherwise we have to go forward and ... */
2483 mddev
->can_decrease_events
= nospares
;
2486 if (!mddev
->events
) {
2488 * oops, this 64-bit counter should never wrap.
2489 * Either we are in around ~1 trillion A.C., assuming
2490 * 1 reboot per second, or we have a bug:
2496 rdev_for_each(rdev
, mddev
) {
2497 if (rdev
->badblocks
.changed
)
2498 any_badblocks_changed
++;
2499 if (test_bit(Faulty
, &rdev
->flags
))
2500 set_bit(FaultRecorded
, &rdev
->flags
);
2503 sync_sbs(mddev
, nospares
);
2504 spin_unlock_irq(&mddev
->write_lock
);
2506 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2507 mdname(mddev
), mddev
->in_sync
);
2509 bitmap_update_sb(mddev
->bitmap
);
2510 rdev_for_each(rdev
, mddev
) {
2511 char b
[BDEVNAME_SIZE
];
2513 if (rdev
->sb_loaded
!= 1)
2514 continue; /* no noise on spare devices */
2516 if (!test_bit(Faulty
, &rdev
->flags
) &&
2517 rdev
->saved_raid_disk
== -1) {
2518 md_super_write(mddev
,rdev
,
2519 rdev
->sb_start
, rdev
->sb_size
,
2521 pr_debug("md: (write) %s's sb offset: %llu\n",
2522 bdevname(rdev
->bdev
, b
),
2523 (unsigned long long)rdev
->sb_start
);
2524 rdev
->sb_events
= mddev
->events
;
2525 if (rdev
->badblocks
.size
) {
2526 md_super_write(mddev
, rdev
,
2527 rdev
->badblocks
.sector
,
2528 rdev
->badblocks
.size
<< 9,
2530 rdev
->badblocks
.size
= 0;
2533 } else if (test_bit(Faulty
, &rdev
->flags
))
2534 pr_debug("md: %s (skipping faulty)\n",
2535 bdevname(rdev
->bdev
, b
));
2537 pr_debug("(skipping incremental s/r ");
2539 if (mddev
->level
== LEVEL_MULTIPATH
)
2540 /* only need to write one superblock... */
2543 md_super_wait(mddev
);
2544 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2546 spin_lock_irq(&mddev
->write_lock
);
2547 if (mddev
->in_sync
!= sync_req
||
2548 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2549 /* have to write it out again */
2550 spin_unlock_irq(&mddev
->write_lock
);
2553 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2554 spin_unlock_irq(&mddev
->write_lock
);
2555 wake_up(&mddev
->sb_wait
);
2556 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2557 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2559 rdev_for_each(rdev
, mddev
) {
2560 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2561 clear_bit(Blocked
, &rdev
->flags
);
2563 if (any_badblocks_changed
)
2564 md_ack_all_badblocks(&rdev
->badblocks
);
2565 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2566 wake_up(&rdev
->blocked_wait
);
2570 /* words written to sysfs files may, or may not, be \n terminated.
2571 * We want to accept with case. For this we use cmd_match.
2573 static int cmd_match(const char *cmd
, const char *str
)
2575 /* See if cmd, written into a sysfs file, matches
2576 * str. They must either be the same, or cmd can
2577 * have a trailing newline
2579 while (*cmd
&& *str
&& *cmd
== *str
) {
2590 struct rdev_sysfs_entry
{
2591 struct attribute attr
;
2592 ssize_t (*show
)(struct md_rdev
*, char *);
2593 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2597 state_show(struct md_rdev
*rdev
, char *page
)
2602 if (test_bit(Faulty
, &rdev
->flags
) ||
2603 rdev
->badblocks
.unacked_exist
) {
2604 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2607 if (test_bit(In_sync
, &rdev
->flags
)) {
2608 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2611 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2612 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2615 if (test_bit(Blocked
, &rdev
->flags
) ||
2616 (rdev
->badblocks
.unacked_exist
2617 && !test_bit(Faulty
, &rdev
->flags
))) {
2618 len
+= sprintf(page
+len
, "%sblocked", sep
);
2621 if (!test_bit(Faulty
, &rdev
->flags
) &&
2622 !test_bit(In_sync
, &rdev
->flags
)) {
2623 len
+= sprintf(page
+len
, "%sspare", sep
);
2626 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2627 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2630 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2631 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2634 if (test_bit(Replacement
, &rdev
->flags
)) {
2635 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2639 return len
+sprintf(page
+len
, "\n");
2643 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2646 * faulty - simulates an error
2647 * remove - disconnects the device
2648 * writemostly - sets write_mostly
2649 * -writemostly - clears write_mostly
2650 * blocked - sets the Blocked flags
2651 * -blocked - clears the Blocked and possibly simulates an error
2652 * insync - sets Insync providing device isn't active
2653 * write_error - sets WriteErrorSeen
2654 * -write_error - clears WriteErrorSeen
2657 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2658 md_error(rdev
->mddev
, rdev
);
2659 if (test_bit(Faulty
, &rdev
->flags
))
2663 } else if (cmd_match(buf
, "remove")) {
2664 if (rdev
->raid_disk
>= 0)
2667 struct mddev
*mddev
= rdev
->mddev
;
2668 kick_rdev_from_array(rdev
);
2670 md_update_sb(mddev
, 1);
2671 md_new_event(mddev
);
2674 } else if (cmd_match(buf
, "writemostly")) {
2675 set_bit(WriteMostly
, &rdev
->flags
);
2677 } else if (cmd_match(buf
, "-writemostly")) {
2678 clear_bit(WriteMostly
, &rdev
->flags
);
2680 } else if (cmd_match(buf
, "blocked")) {
2681 set_bit(Blocked
, &rdev
->flags
);
2683 } else if (cmd_match(buf
, "-blocked")) {
2684 if (!test_bit(Faulty
, &rdev
->flags
) &&
2685 rdev
->badblocks
.unacked_exist
) {
2686 /* metadata handler doesn't understand badblocks,
2687 * so we need to fail the device
2689 md_error(rdev
->mddev
, rdev
);
2691 clear_bit(Blocked
, &rdev
->flags
);
2692 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2693 wake_up(&rdev
->blocked_wait
);
2694 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2695 md_wakeup_thread(rdev
->mddev
->thread
);
2698 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2699 set_bit(In_sync
, &rdev
->flags
);
2701 } else if (cmd_match(buf
, "write_error")) {
2702 set_bit(WriteErrorSeen
, &rdev
->flags
);
2704 } else if (cmd_match(buf
, "-write_error")) {
2705 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2707 } else if (cmd_match(buf
, "want_replacement")) {
2708 /* Any non-spare device that is not a replacement can
2709 * become want_replacement at any time, but we then need to
2710 * check if recovery is needed.
2712 if (rdev
->raid_disk
>= 0 &&
2713 !test_bit(Replacement
, &rdev
->flags
))
2714 set_bit(WantReplacement
, &rdev
->flags
);
2715 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2716 md_wakeup_thread(rdev
->mddev
->thread
);
2718 } else if (cmd_match(buf
, "-want_replacement")) {
2719 /* Clearing 'want_replacement' is always allowed.
2720 * Once replacements starts it is too late though.
2723 clear_bit(WantReplacement
, &rdev
->flags
);
2724 } else if (cmd_match(buf
, "replacement")) {
2725 /* Can only set a device as a replacement when array has not
2726 * yet been started. Once running, replacement is automatic
2727 * from spares, or by assigning 'slot'.
2729 if (rdev
->mddev
->pers
)
2732 set_bit(Replacement
, &rdev
->flags
);
2735 } else if (cmd_match(buf
, "-replacement")) {
2736 /* Similarly, can only clear Replacement before start */
2737 if (rdev
->mddev
->pers
)
2740 clear_bit(Replacement
, &rdev
->flags
);
2745 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2746 return err
? err
: len
;
2748 static struct rdev_sysfs_entry rdev_state
=
2749 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2752 errors_show(struct md_rdev
*rdev
, char *page
)
2754 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2758 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2761 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2762 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2763 atomic_set(&rdev
->corrected_errors
, n
);
2768 static struct rdev_sysfs_entry rdev_errors
=
2769 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2772 slot_show(struct md_rdev
*rdev
, char *page
)
2774 if (rdev
->raid_disk
< 0)
2775 return sprintf(page
, "none\n");
2777 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2781 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2785 int slot
= simple_strtoul(buf
, &e
, 10);
2786 if (strncmp(buf
, "none", 4)==0)
2788 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2790 if (rdev
->mddev
->pers
&& slot
== -1) {
2791 /* Setting 'slot' on an active array requires also
2792 * updating the 'rd%d' link, and communicating
2793 * with the personality with ->hot_*_disk.
2794 * For now we only support removing
2795 * failed/spare devices. This normally happens automatically,
2796 * but not when the metadata is externally managed.
2798 if (rdev
->raid_disk
== -1)
2800 /* personality does all needed checks */
2801 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2803 err
= rdev
->mddev
->pers
->
2804 hot_remove_disk(rdev
->mddev
, rdev
);
2807 sysfs_unlink_rdev(rdev
->mddev
, rdev
);
2808 rdev
->raid_disk
= -1;
2809 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2810 md_wakeup_thread(rdev
->mddev
->thread
);
2811 } else if (rdev
->mddev
->pers
) {
2812 /* Activating a spare .. or possibly reactivating
2813 * if we ever get bitmaps working here.
2816 if (rdev
->raid_disk
!= -1)
2819 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2822 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2825 if (slot
>= rdev
->mddev
->raid_disks
&&
2826 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2829 rdev
->raid_disk
= slot
;
2830 if (test_bit(In_sync
, &rdev
->flags
))
2831 rdev
->saved_raid_disk
= slot
;
2833 rdev
->saved_raid_disk
= -1;
2834 clear_bit(In_sync
, &rdev
->flags
);
2835 err
= rdev
->mddev
->pers
->
2836 hot_add_disk(rdev
->mddev
, rdev
);
2838 rdev
->raid_disk
= -1;
2841 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2842 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2843 /* failure here is OK */;
2844 /* don't wakeup anyone, leave that to userspace. */
2846 if (slot
>= rdev
->mddev
->raid_disks
&&
2847 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2849 rdev
->raid_disk
= slot
;
2850 /* assume it is working */
2851 clear_bit(Faulty
, &rdev
->flags
);
2852 clear_bit(WriteMostly
, &rdev
->flags
);
2853 set_bit(In_sync
, &rdev
->flags
);
2854 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2860 static struct rdev_sysfs_entry rdev_slot
=
2861 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2864 offset_show(struct md_rdev
*rdev
, char *page
)
2866 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2870 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2872 unsigned long long offset
;
2873 if (strict_strtoull(buf
, 10, &offset
) < 0)
2875 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2877 if (rdev
->sectors
&& rdev
->mddev
->external
)
2878 /* Must set offset before size, so overlap checks
2881 rdev
->data_offset
= offset
;
2882 rdev
->new_data_offset
= offset
;
2886 static struct rdev_sysfs_entry rdev_offset
=
2887 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2889 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2891 return sprintf(page
, "%llu\n",
2892 (unsigned long long)rdev
->new_data_offset
);
2895 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2896 const char *buf
, size_t len
)
2898 unsigned long long new_offset
;
2899 struct mddev
*mddev
= rdev
->mddev
;
2901 if (strict_strtoull(buf
, 10, &new_offset
) < 0)
2904 if (mddev
->sync_thread
)
2906 if (new_offset
== rdev
->data_offset
)
2907 /* reset is always permitted */
2909 else if (new_offset
> rdev
->data_offset
) {
2910 /* must not push array size beyond rdev_sectors */
2911 if (new_offset
- rdev
->data_offset
2912 + mddev
->dev_sectors
> rdev
->sectors
)
2915 /* Metadata worries about other space details. */
2917 /* decreasing the offset is inconsistent with a backwards
2920 if (new_offset
< rdev
->data_offset
&&
2921 mddev
->reshape_backwards
)
2923 /* Increasing offset is inconsistent with forwards
2924 * reshape. reshape_direction should be set to
2925 * 'backwards' first.
2927 if (new_offset
> rdev
->data_offset
&&
2928 !mddev
->reshape_backwards
)
2931 if (mddev
->pers
&& mddev
->persistent
&&
2932 !super_types
[mddev
->major_version
]
2933 .allow_new_offset(rdev
, new_offset
))
2935 rdev
->new_data_offset
= new_offset
;
2936 if (new_offset
> rdev
->data_offset
)
2937 mddev
->reshape_backwards
= 1;
2938 else if (new_offset
< rdev
->data_offset
)
2939 mddev
->reshape_backwards
= 0;
2943 static struct rdev_sysfs_entry rdev_new_offset
=
2944 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2947 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2949 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2952 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2954 /* check if two start/length pairs overlap */
2962 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2964 unsigned long long blocks
;
2967 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2970 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2971 return -EINVAL
; /* sector conversion overflow */
2974 if (new != blocks
* 2)
2975 return -EINVAL
; /* unsigned long long to sector_t overflow */
2982 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2984 struct mddev
*my_mddev
= rdev
->mddev
;
2985 sector_t oldsectors
= rdev
->sectors
;
2988 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2990 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2991 return -EINVAL
; /* too confusing */
2992 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2993 if (my_mddev
->persistent
) {
2994 sectors
= super_types
[my_mddev
->major_version
].
2995 rdev_size_change(rdev
, sectors
);
2998 } else if (!sectors
)
2999 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
3001 if (!my_mddev
->pers
->resize
)
3002 /* Cannot change size for RAID0 or Linear etc */
3005 if (sectors
< my_mddev
->dev_sectors
)
3006 return -EINVAL
; /* component must fit device */
3008 rdev
->sectors
= sectors
;
3009 if (sectors
> oldsectors
&& my_mddev
->external
) {
3010 /* need to check that all other rdevs with the same ->bdev
3011 * do not overlap. We need to unlock the mddev to avoid
3012 * a deadlock. We have already changed rdev->sectors, and if
3013 * we have to change it back, we will have the lock again.
3015 struct mddev
*mddev
;
3017 struct list_head
*tmp
;
3019 mddev_unlock(my_mddev
);
3020 for_each_mddev(mddev
, tmp
) {
3021 struct md_rdev
*rdev2
;
3024 rdev_for_each(rdev2
, mddev
)
3025 if (rdev
->bdev
== rdev2
->bdev
&&
3027 overlaps(rdev
->data_offset
, rdev
->sectors
,
3033 mddev_unlock(mddev
);
3039 mddev_lock(my_mddev
);
3041 /* Someone else could have slipped in a size
3042 * change here, but doing so is just silly.
3043 * We put oldsectors back because we *know* it is
3044 * safe, and trust userspace not to race with
3047 rdev
->sectors
= oldsectors
;
3054 static struct rdev_sysfs_entry rdev_size
=
3055 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3058 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3060 unsigned long long recovery_start
= rdev
->recovery_offset
;
3062 if (test_bit(In_sync
, &rdev
->flags
) ||
3063 recovery_start
== MaxSector
)
3064 return sprintf(page
, "none\n");
3066 return sprintf(page
, "%llu\n", recovery_start
);
3069 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3071 unsigned long long recovery_start
;
3073 if (cmd_match(buf
, "none"))
3074 recovery_start
= MaxSector
;
3075 else if (strict_strtoull(buf
, 10, &recovery_start
))
3078 if (rdev
->mddev
->pers
&&
3079 rdev
->raid_disk
>= 0)
3082 rdev
->recovery_offset
= recovery_start
;
3083 if (recovery_start
== MaxSector
)
3084 set_bit(In_sync
, &rdev
->flags
);
3086 clear_bit(In_sync
, &rdev
->flags
);
3090 static struct rdev_sysfs_entry rdev_recovery_start
=
3091 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3095 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3097 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3099 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3101 return badblocks_show(&rdev
->badblocks
, page
, 0);
3103 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3105 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3106 /* Maybe that ack was all we needed */
3107 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3108 wake_up(&rdev
->blocked_wait
);
3111 static struct rdev_sysfs_entry rdev_bad_blocks
=
3112 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3115 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3117 return badblocks_show(&rdev
->badblocks
, page
, 1);
3119 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3121 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3123 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3124 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3126 static struct attribute
*rdev_default_attrs
[] = {
3131 &rdev_new_offset
.attr
,
3133 &rdev_recovery_start
.attr
,
3134 &rdev_bad_blocks
.attr
,
3135 &rdev_unack_bad_blocks
.attr
,
3139 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3141 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3142 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3143 struct mddev
*mddev
= rdev
->mddev
;
3149 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3151 if (rdev
->mddev
== NULL
)
3154 rv
= entry
->show(rdev
, page
);
3155 mddev_unlock(mddev
);
3161 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3162 const char *page
, size_t length
)
3164 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3165 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3167 struct mddev
*mddev
= rdev
->mddev
;
3171 if (!capable(CAP_SYS_ADMIN
))
3173 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3175 if (rdev
->mddev
== NULL
)
3178 rv
= entry
->store(rdev
, page
, length
);
3179 mddev_unlock(mddev
);
3184 static void rdev_free(struct kobject
*ko
)
3186 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3189 static const struct sysfs_ops rdev_sysfs_ops
= {
3190 .show
= rdev_attr_show
,
3191 .store
= rdev_attr_store
,
3193 static struct kobj_type rdev_ktype
= {
3194 .release
= rdev_free
,
3195 .sysfs_ops
= &rdev_sysfs_ops
,
3196 .default_attrs
= rdev_default_attrs
,
3199 int md_rdev_init(struct md_rdev
*rdev
)
3202 rdev
->saved_raid_disk
= -1;
3203 rdev
->raid_disk
= -1;
3205 rdev
->data_offset
= 0;
3206 rdev
->new_data_offset
= 0;
3207 rdev
->sb_events
= 0;
3208 rdev
->last_read_error
.tv_sec
= 0;
3209 rdev
->last_read_error
.tv_nsec
= 0;
3210 rdev
->sb_loaded
= 0;
3211 rdev
->bb_page
= NULL
;
3212 atomic_set(&rdev
->nr_pending
, 0);
3213 atomic_set(&rdev
->read_errors
, 0);
3214 atomic_set(&rdev
->corrected_errors
, 0);
3216 INIT_LIST_HEAD(&rdev
->same_set
);
3217 init_waitqueue_head(&rdev
->blocked_wait
);
3219 /* Add space to store bad block list.
3220 * This reserves the space even on arrays where it cannot
3221 * be used - I wonder if that matters
3223 rdev
->badblocks
.count
= 0;
3224 rdev
->badblocks
.shift
= 0;
3225 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3226 seqlock_init(&rdev
->badblocks
.lock
);
3227 if (rdev
->badblocks
.page
== NULL
)
3232 EXPORT_SYMBOL_GPL(md_rdev_init
);
3234 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3236 * mark the device faulty if:
3238 * - the device is nonexistent (zero size)
3239 * - the device has no valid superblock
3241 * a faulty rdev _never_ has rdev->sb set.
3243 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3245 char b
[BDEVNAME_SIZE
];
3247 struct md_rdev
*rdev
;
3250 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3252 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3253 return ERR_PTR(-ENOMEM
);
3256 err
= md_rdev_init(rdev
);
3259 err
= alloc_disk_sb(rdev
);
3263 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3267 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3269 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3272 "md: %s has zero or unknown size, marking faulty!\n",
3273 bdevname(rdev
->bdev
,b
));
3278 if (super_format
>= 0) {
3279 err
= super_types
[super_format
].
3280 load_super(rdev
, NULL
, super_minor
);
3281 if (err
== -EINVAL
) {
3283 "md: %s does not have a valid v%d.%d "
3284 "superblock, not importing!\n",
3285 bdevname(rdev
->bdev
,b
),
3286 super_format
, super_minor
);
3291 "md: could not read %s's sb, not importing!\n",
3292 bdevname(rdev
->bdev
,b
));
3296 if (super_format
== -1)
3297 /* hot-add for 0.90, or non-persistent: so no badblocks */
3298 rdev
->badblocks
.shift
= -1;
3305 md_rdev_clear(rdev
);
3307 return ERR_PTR(err
);
3311 * Check a full RAID array for plausibility
3315 static void analyze_sbs(struct mddev
* mddev
)
3318 struct md_rdev
*rdev
, *freshest
, *tmp
;
3319 char b
[BDEVNAME_SIZE
];
3322 rdev_for_each_safe(rdev
, tmp
, mddev
)
3323 switch (super_types
[mddev
->major_version
].
3324 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3332 "md: fatal superblock inconsistency in %s"
3333 " -- removing from array\n",
3334 bdevname(rdev
->bdev
,b
));
3335 kick_rdev_from_array(rdev
);
3339 super_types
[mddev
->major_version
].
3340 validate_super(mddev
, freshest
);
3343 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3344 if (mddev
->max_disks
&&
3345 (rdev
->desc_nr
>= mddev
->max_disks
||
3346 i
> mddev
->max_disks
)) {
3348 "md: %s: %s: only %d devices permitted\n",
3349 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3351 kick_rdev_from_array(rdev
);
3354 if (rdev
!= freshest
)
3355 if (super_types
[mddev
->major_version
].
3356 validate_super(mddev
, rdev
)) {
3357 printk(KERN_WARNING
"md: kicking non-fresh %s"
3359 bdevname(rdev
->bdev
,b
));
3360 kick_rdev_from_array(rdev
);
3363 if (mddev
->level
== LEVEL_MULTIPATH
) {
3364 rdev
->desc_nr
= i
++;
3365 rdev
->raid_disk
= rdev
->desc_nr
;
3366 set_bit(In_sync
, &rdev
->flags
);
3367 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3368 rdev
->raid_disk
= -1;
3369 clear_bit(In_sync
, &rdev
->flags
);
3374 /* Read a fixed-point number.
3375 * Numbers in sysfs attributes should be in "standard" units where
3376 * possible, so time should be in seconds.
3377 * However we internally use a a much smaller unit such as
3378 * milliseconds or jiffies.
3379 * This function takes a decimal number with a possible fractional
3380 * component, and produces an integer which is the result of
3381 * multiplying that number by 10^'scale'.
3382 * all without any floating-point arithmetic.
3384 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3386 unsigned long result
= 0;
3388 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3391 else if (decimals
< scale
) {
3394 result
= result
* 10 + value
;
3406 while (decimals
< scale
) {
3415 static void md_safemode_timeout(unsigned long data
);
3418 safe_delay_show(struct mddev
*mddev
, char *page
)
3420 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3421 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3424 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3428 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3431 mddev
->safemode_delay
= 0;
3433 unsigned long old_delay
= mddev
->safemode_delay
;
3434 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3435 if (mddev
->safemode_delay
== 0)
3436 mddev
->safemode_delay
= 1;
3437 if (mddev
->safemode_delay
< old_delay
)
3438 md_safemode_timeout((unsigned long)mddev
);
3442 static struct md_sysfs_entry md_safe_delay
=
3443 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3446 level_show(struct mddev
*mddev
, char *page
)
3448 struct md_personality
*p
= mddev
->pers
;
3450 return sprintf(page
, "%s\n", p
->name
);
3451 else if (mddev
->clevel
[0])
3452 return sprintf(page
, "%s\n", mddev
->clevel
);
3453 else if (mddev
->level
!= LEVEL_NONE
)
3454 return sprintf(page
, "%d\n", mddev
->level
);
3460 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3464 struct md_personality
*pers
;
3467 struct md_rdev
*rdev
;
3469 if (mddev
->pers
== NULL
) {
3472 if (len
>= sizeof(mddev
->clevel
))
3474 strncpy(mddev
->clevel
, buf
, len
);
3475 if (mddev
->clevel
[len
-1] == '\n')
3477 mddev
->clevel
[len
] = 0;
3478 mddev
->level
= LEVEL_NONE
;
3482 /* request to change the personality. Need to ensure:
3483 * - array is not engaged in resync/recovery/reshape
3484 * - old personality can be suspended
3485 * - new personality will access other array.
3488 if (mddev
->sync_thread
||
3489 mddev
->reshape_position
!= MaxSector
||
3490 mddev
->sysfs_active
)
3493 if (!mddev
->pers
->quiesce
) {
3494 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3495 mdname(mddev
), mddev
->pers
->name
);
3499 /* Now find the new personality */
3500 if (len
== 0 || len
>= sizeof(clevel
))
3502 strncpy(clevel
, buf
, len
);
3503 if (clevel
[len
-1] == '\n')
3506 if (strict_strtol(clevel
, 10, &level
))
3509 if (request_module("md-%s", clevel
) != 0)
3510 request_module("md-level-%s", clevel
);
3511 spin_lock(&pers_lock
);
3512 pers
= find_pers(level
, clevel
);
3513 if (!pers
|| !try_module_get(pers
->owner
)) {
3514 spin_unlock(&pers_lock
);
3515 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3518 spin_unlock(&pers_lock
);
3520 if (pers
== mddev
->pers
) {
3521 /* Nothing to do! */
3522 module_put(pers
->owner
);
3525 if (!pers
->takeover
) {
3526 module_put(pers
->owner
);
3527 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3528 mdname(mddev
), clevel
);
3532 rdev_for_each(rdev
, mddev
)
3533 rdev
->new_raid_disk
= rdev
->raid_disk
;
3535 /* ->takeover must set new_* and/or delta_disks
3536 * if it succeeds, and may set them when it fails.
3538 priv
= pers
->takeover(mddev
);
3540 mddev
->new_level
= mddev
->level
;
3541 mddev
->new_layout
= mddev
->layout
;
3542 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3543 mddev
->raid_disks
-= mddev
->delta_disks
;
3544 mddev
->delta_disks
= 0;
3545 mddev
->reshape_backwards
= 0;
3546 module_put(pers
->owner
);
3547 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3548 mdname(mddev
), clevel
);
3549 return PTR_ERR(priv
);
3552 /* Looks like we have a winner */
3553 mddev_suspend(mddev
);
3554 mddev
->pers
->stop(mddev
);
3556 if (mddev
->pers
->sync_request
== NULL
&&
3557 pers
->sync_request
!= NULL
) {
3558 /* need to add the md_redundancy_group */
3559 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3561 "md: cannot register extra attributes for %s\n",
3563 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3565 if (mddev
->pers
->sync_request
!= NULL
&&
3566 pers
->sync_request
== NULL
) {
3567 /* need to remove the md_redundancy_group */
3568 if (mddev
->to_remove
== NULL
)
3569 mddev
->to_remove
= &md_redundancy_group
;
3572 if (mddev
->pers
->sync_request
== NULL
&&
3574 /* We are converting from a no-redundancy array
3575 * to a redundancy array and metadata is managed
3576 * externally so we need to be sure that writes
3577 * won't block due to a need to transition
3579 * until external management is started.
3582 mddev
->safemode_delay
= 0;
3583 mddev
->safemode
= 0;
3586 rdev_for_each(rdev
, mddev
) {
3587 if (rdev
->raid_disk
< 0)
3589 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3590 rdev
->new_raid_disk
= -1;
3591 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3593 sysfs_unlink_rdev(mddev
, rdev
);
3595 rdev_for_each(rdev
, mddev
) {
3596 if (rdev
->raid_disk
< 0)
3598 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3600 rdev
->raid_disk
= rdev
->new_raid_disk
;
3601 if (rdev
->raid_disk
< 0)
3602 clear_bit(In_sync
, &rdev
->flags
);
3604 if (sysfs_link_rdev(mddev
, rdev
))
3605 printk(KERN_WARNING
"md: cannot register rd%d"
3606 " for %s after level change\n",
3607 rdev
->raid_disk
, mdname(mddev
));
3611 module_put(mddev
->pers
->owner
);
3613 mddev
->private = priv
;
3614 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3615 mddev
->level
= mddev
->new_level
;
3616 mddev
->layout
= mddev
->new_layout
;
3617 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3618 mddev
->delta_disks
= 0;
3619 mddev
->reshape_backwards
= 0;
3620 mddev
->degraded
= 0;
3621 if (mddev
->pers
->sync_request
== NULL
) {
3622 /* this is now an array without redundancy, so
3623 * it must always be in_sync
3626 del_timer_sync(&mddev
->safemode_timer
);
3629 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3630 mddev_resume(mddev
);
3631 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3632 md_new_event(mddev
);
3636 static struct md_sysfs_entry md_level
=
3637 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3641 layout_show(struct mddev
*mddev
, char *page
)
3643 /* just a number, not meaningful for all levels */
3644 if (mddev
->reshape_position
!= MaxSector
&&
3645 mddev
->layout
!= mddev
->new_layout
)
3646 return sprintf(page
, "%d (%d)\n",
3647 mddev
->new_layout
, mddev
->layout
);
3648 return sprintf(page
, "%d\n", mddev
->layout
);
3652 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3655 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3657 if (!*buf
|| (*e
&& *e
!= '\n'))
3662 if (mddev
->pers
->check_reshape
== NULL
)
3664 mddev
->new_layout
= n
;
3665 err
= mddev
->pers
->check_reshape(mddev
);
3667 mddev
->new_layout
= mddev
->layout
;
3671 mddev
->new_layout
= n
;
3672 if (mddev
->reshape_position
== MaxSector
)
3677 static struct md_sysfs_entry md_layout
=
3678 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3682 raid_disks_show(struct mddev
*mddev
, char *page
)
3684 if (mddev
->raid_disks
== 0)
3686 if (mddev
->reshape_position
!= MaxSector
&&
3687 mddev
->delta_disks
!= 0)
3688 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3689 mddev
->raid_disks
- mddev
->delta_disks
);
3690 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3693 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3696 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3700 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3702 if (!*buf
|| (*e
&& *e
!= '\n'))
3706 rv
= update_raid_disks(mddev
, n
);
3707 else if (mddev
->reshape_position
!= MaxSector
) {
3708 struct md_rdev
*rdev
;
3709 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3711 rdev_for_each(rdev
, mddev
) {
3713 rdev
->data_offset
< rdev
->new_data_offset
)
3716 rdev
->data_offset
> rdev
->new_data_offset
)
3719 mddev
->delta_disks
= n
- olddisks
;
3720 mddev
->raid_disks
= n
;
3721 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3723 mddev
->raid_disks
= n
;
3724 return rv
? rv
: len
;
3726 static struct md_sysfs_entry md_raid_disks
=
3727 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3730 chunk_size_show(struct mddev
*mddev
, char *page
)
3732 if (mddev
->reshape_position
!= MaxSector
&&
3733 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3734 return sprintf(page
, "%d (%d)\n",
3735 mddev
->new_chunk_sectors
<< 9,
3736 mddev
->chunk_sectors
<< 9);
3737 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3741 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3744 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3746 if (!*buf
|| (*e
&& *e
!= '\n'))
3751 if (mddev
->pers
->check_reshape
== NULL
)
3753 mddev
->new_chunk_sectors
= n
>> 9;
3754 err
= mddev
->pers
->check_reshape(mddev
);
3756 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3760 mddev
->new_chunk_sectors
= n
>> 9;
3761 if (mddev
->reshape_position
== MaxSector
)
3762 mddev
->chunk_sectors
= n
>> 9;
3766 static struct md_sysfs_entry md_chunk_size
=
3767 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3770 resync_start_show(struct mddev
*mddev
, char *page
)
3772 if (mddev
->recovery_cp
== MaxSector
)
3773 return sprintf(page
, "none\n");
3774 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3778 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3781 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3783 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3785 if (cmd_match(buf
, "none"))
3787 else if (!*buf
|| (*e
&& *e
!= '\n'))
3790 mddev
->recovery_cp
= n
;
3792 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3795 static struct md_sysfs_entry md_resync_start
=
3796 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3799 * The array state can be:
3802 * No devices, no size, no level
3803 * Equivalent to STOP_ARRAY ioctl
3805 * May have some settings, but array is not active
3806 * all IO results in error
3807 * When written, doesn't tear down array, but just stops it
3808 * suspended (not supported yet)
3809 * All IO requests will block. The array can be reconfigured.
3810 * Writing this, if accepted, will block until array is quiescent
3812 * no resync can happen. no superblocks get written.
3813 * write requests fail
3815 * like readonly, but behaves like 'clean' on a write request.
3817 * clean - no pending writes, but otherwise active.
3818 * When written to inactive array, starts without resync
3819 * If a write request arrives then
3820 * if metadata is known, mark 'dirty' and switch to 'active'.
3821 * if not known, block and switch to write-pending
3822 * If written to an active array that has pending writes, then fails.
3824 * fully active: IO and resync can be happening.
3825 * When written to inactive array, starts with resync
3828 * clean, but writes are blocked waiting for 'active' to be written.
3831 * like active, but no writes have been seen for a while (100msec).
3834 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3835 write_pending
, active_idle
, bad_word
};
3836 static char *array_states
[] = {
3837 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3838 "write-pending", "active-idle", NULL
};
3840 static int match_word(const char *word
, char **list
)
3843 for (n
=0; list
[n
]; n
++)
3844 if (cmd_match(word
, list
[n
]))
3850 array_state_show(struct mddev
*mddev
, char *page
)
3852 enum array_state st
= inactive
;
3865 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3867 else if (mddev
->safemode
)
3873 if (list_empty(&mddev
->disks
) &&
3874 mddev
->raid_disks
== 0 &&
3875 mddev
->dev_sectors
== 0)
3880 return sprintf(page
, "%s\n", array_states
[st
]);
3883 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3884 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3885 static int do_md_run(struct mddev
* mddev
);
3886 static int restart_array(struct mddev
*mddev
);
3889 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3892 enum array_state st
= match_word(buf
, array_states
);
3897 /* stopping an active array */
3898 err
= do_md_stop(mddev
, 0, NULL
);
3901 /* stopping an active array */
3903 err
= do_md_stop(mddev
, 2, NULL
);
3905 err
= 0; /* already inactive */
3908 break; /* not supported yet */
3911 err
= md_set_readonly(mddev
, NULL
);
3914 set_disk_ro(mddev
->gendisk
, 1);
3915 err
= do_md_run(mddev
);
3921 err
= md_set_readonly(mddev
, NULL
);
3922 else if (mddev
->ro
== 1)
3923 err
= restart_array(mddev
);
3926 set_disk_ro(mddev
->gendisk
, 0);
3930 err
= do_md_run(mddev
);
3935 restart_array(mddev
);
3936 spin_lock_irq(&mddev
->write_lock
);
3937 if (atomic_read(&mddev
->writes_pending
) == 0) {
3938 if (mddev
->in_sync
== 0) {
3940 if (mddev
->safemode
== 1)
3941 mddev
->safemode
= 0;
3942 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3947 spin_unlock_irq(&mddev
->write_lock
);
3953 restart_array(mddev
);
3954 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3955 wake_up(&mddev
->sb_wait
);
3959 set_disk_ro(mddev
->gendisk
, 0);
3960 err
= do_md_run(mddev
);
3965 /* these cannot be set */
3971 if (mddev
->hold_active
== UNTIL_IOCTL
)
3972 mddev
->hold_active
= 0;
3973 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3977 static struct md_sysfs_entry md_array_state
=
3978 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3981 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3982 return sprintf(page
, "%d\n",
3983 atomic_read(&mddev
->max_corr_read_errors
));
3987 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3990 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3992 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3993 atomic_set(&mddev
->max_corr_read_errors
, n
);
3999 static struct md_sysfs_entry max_corr_read_errors
=
4000 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4001 max_corrected_read_errors_store
);
4004 null_show(struct mddev
*mddev
, char *page
)
4010 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4012 /* buf must be %d:%d\n? giving major and minor numbers */
4013 /* The new device is added to the array.
4014 * If the array has a persistent superblock, we read the
4015 * superblock to initialise info and check validity.
4016 * Otherwise, only checking done is that in bind_rdev_to_array,
4017 * which mainly checks size.
4020 int major
= simple_strtoul(buf
, &e
, 10);
4023 struct md_rdev
*rdev
;
4026 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4028 minor
= simple_strtoul(e
+1, &e
, 10);
4029 if (*e
&& *e
!= '\n')
4031 dev
= MKDEV(major
, minor
);
4032 if (major
!= MAJOR(dev
) ||
4033 minor
!= MINOR(dev
))
4037 if (mddev
->persistent
) {
4038 rdev
= md_import_device(dev
, mddev
->major_version
,
4039 mddev
->minor_version
);
4040 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4041 struct md_rdev
*rdev0
4042 = list_entry(mddev
->disks
.next
,
4043 struct md_rdev
, same_set
);
4044 err
= super_types
[mddev
->major_version
]
4045 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4049 } else if (mddev
->external
)
4050 rdev
= md_import_device(dev
, -2, -1);
4052 rdev
= md_import_device(dev
, -1, -1);
4055 return PTR_ERR(rdev
);
4056 err
= bind_rdev_to_array(rdev
, mddev
);
4060 return err
? err
: len
;
4063 static struct md_sysfs_entry md_new_device
=
4064 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4067 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4070 unsigned long chunk
, end_chunk
;
4074 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4076 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4077 if (buf
== end
) break;
4078 if (*end
== '-') { /* range */
4080 end_chunk
= simple_strtoul(buf
, &end
, 0);
4081 if (buf
== end
) break;
4083 if (*end
&& !isspace(*end
)) break;
4084 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4085 buf
= skip_spaces(end
);
4087 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4092 static struct md_sysfs_entry md_bitmap
=
4093 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4096 size_show(struct mddev
*mddev
, char *page
)
4098 return sprintf(page
, "%llu\n",
4099 (unsigned long long)mddev
->dev_sectors
/ 2);
4102 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4105 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4107 /* If array is inactive, we can reduce the component size, but
4108 * not increase it (except from 0).
4109 * If array is active, we can try an on-line resize
4112 int err
= strict_blocks_to_sectors(buf
, §ors
);
4117 err
= update_size(mddev
, sectors
);
4118 md_update_sb(mddev
, 1);
4120 if (mddev
->dev_sectors
== 0 ||
4121 mddev
->dev_sectors
> sectors
)
4122 mddev
->dev_sectors
= sectors
;
4126 return err
? err
: len
;
4129 static struct md_sysfs_entry md_size
=
4130 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4133 /* Metadata version.
4135 * 'none' for arrays with no metadata (good luck...)
4136 * 'external' for arrays with externally managed metadata,
4137 * or N.M for internally known formats
4140 metadata_show(struct mddev
*mddev
, char *page
)
4142 if (mddev
->persistent
)
4143 return sprintf(page
, "%d.%d\n",
4144 mddev
->major_version
, mddev
->minor_version
);
4145 else if (mddev
->external
)
4146 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4148 return sprintf(page
, "none\n");
4152 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4156 /* Changing the details of 'external' metadata is
4157 * always permitted. Otherwise there must be
4158 * no devices attached to the array.
4160 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4162 else if (!list_empty(&mddev
->disks
))
4165 if (cmd_match(buf
, "none")) {
4166 mddev
->persistent
= 0;
4167 mddev
->external
= 0;
4168 mddev
->major_version
= 0;
4169 mddev
->minor_version
= 90;
4172 if (strncmp(buf
, "external:", 9) == 0) {
4173 size_t namelen
= len
-9;
4174 if (namelen
>= sizeof(mddev
->metadata_type
))
4175 namelen
= sizeof(mddev
->metadata_type
)-1;
4176 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4177 mddev
->metadata_type
[namelen
] = 0;
4178 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4179 mddev
->metadata_type
[--namelen
] = 0;
4180 mddev
->persistent
= 0;
4181 mddev
->external
= 1;
4182 mddev
->major_version
= 0;
4183 mddev
->minor_version
= 90;
4186 major
= simple_strtoul(buf
, &e
, 10);
4187 if (e
==buf
|| *e
!= '.')
4190 minor
= simple_strtoul(buf
, &e
, 10);
4191 if (e
==buf
|| (*e
&& *e
!= '\n') )
4193 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4195 mddev
->major_version
= major
;
4196 mddev
->minor_version
= minor
;
4197 mddev
->persistent
= 1;
4198 mddev
->external
= 0;
4202 static struct md_sysfs_entry md_metadata
=
4203 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4206 action_show(struct mddev
*mddev
, char *page
)
4208 char *type
= "idle";
4209 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4211 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4212 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4213 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4215 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4216 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4218 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4222 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4225 return sprintf(page
, "%s\n", type
);
4228 static void reap_sync_thread(struct mddev
*mddev
);
4231 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4233 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4236 if (cmd_match(page
, "frozen"))
4237 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4239 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4241 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4242 if (mddev
->sync_thread
) {
4243 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4244 reap_sync_thread(mddev
);
4246 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4247 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4249 else if (cmd_match(page
, "resync"))
4250 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4251 else if (cmd_match(page
, "recover")) {
4252 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4253 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4254 } else if (cmd_match(page
, "reshape")) {
4256 if (mddev
->pers
->start_reshape
== NULL
)
4258 err
= mddev
->pers
->start_reshape(mddev
);
4261 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4263 if (cmd_match(page
, "check"))
4264 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4265 else if (!cmd_match(page
, "repair"))
4267 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4268 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4270 if (mddev
->ro
== 2) {
4271 /* A write to sync_action is enough to justify
4272 * canceling read-auto mode
4275 md_wakeup_thread(mddev
->sync_thread
);
4277 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4278 md_wakeup_thread(mddev
->thread
);
4279 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4284 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4286 return sprintf(page
, "%llu\n",
4287 (unsigned long long)
4288 atomic64_read(&mddev
->resync_mismatches
));
4291 static struct md_sysfs_entry md_scan_mode
=
4292 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4295 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4298 sync_min_show(struct mddev
*mddev
, char *page
)
4300 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4301 mddev
->sync_speed_min
? "local": "system");
4305 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4309 if (strncmp(buf
, "system", 6)==0) {
4310 mddev
->sync_speed_min
= 0;
4313 min
= simple_strtoul(buf
, &e
, 10);
4314 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4316 mddev
->sync_speed_min
= min
;
4320 static struct md_sysfs_entry md_sync_min
=
4321 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4324 sync_max_show(struct mddev
*mddev
, char *page
)
4326 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4327 mddev
->sync_speed_max
? "local": "system");
4331 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4335 if (strncmp(buf
, "system", 6)==0) {
4336 mddev
->sync_speed_max
= 0;
4339 max
= simple_strtoul(buf
, &e
, 10);
4340 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4342 mddev
->sync_speed_max
= max
;
4346 static struct md_sysfs_entry md_sync_max
=
4347 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4350 degraded_show(struct mddev
*mddev
, char *page
)
4352 return sprintf(page
, "%d\n", mddev
->degraded
);
4354 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4357 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4359 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4363 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4367 if (strict_strtol(buf
, 10, &n
))
4370 if (n
!= 0 && n
!= 1)
4373 mddev
->parallel_resync
= n
;
4375 if (mddev
->sync_thread
)
4376 wake_up(&resync_wait
);
4381 /* force parallel resync, even with shared block devices */
4382 static struct md_sysfs_entry md_sync_force_parallel
=
4383 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4384 sync_force_parallel_show
, sync_force_parallel_store
);
4387 sync_speed_show(struct mddev
*mddev
, char *page
)
4389 unsigned long resync
, dt
, db
;
4390 if (mddev
->curr_resync
== 0)
4391 return sprintf(page
, "none\n");
4392 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4393 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4395 db
= resync
- mddev
->resync_mark_cnt
;
4396 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4399 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4402 sync_completed_show(struct mddev
*mddev
, char *page
)
4404 unsigned long long max_sectors
, resync
;
4406 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4407 return sprintf(page
, "none\n");
4409 if (mddev
->curr_resync
== 1 ||
4410 mddev
->curr_resync
== 2)
4411 return sprintf(page
, "delayed\n");
4413 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4414 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4415 max_sectors
= mddev
->resync_max_sectors
;
4417 max_sectors
= mddev
->dev_sectors
;
4419 resync
= mddev
->curr_resync_completed
;
4420 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4423 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4426 min_sync_show(struct mddev
*mddev
, char *page
)
4428 return sprintf(page
, "%llu\n",
4429 (unsigned long long)mddev
->resync_min
);
4432 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4434 unsigned long long min
;
4435 if (strict_strtoull(buf
, 10, &min
))
4437 if (min
> mddev
->resync_max
)
4439 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4442 /* Must be a multiple of chunk_size */
4443 if (mddev
->chunk_sectors
) {
4444 sector_t temp
= min
;
4445 if (sector_div(temp
, mddev
->chunk_sectors
))
4448 mddev
->resync_min
= min
;
4453 static struct md_sysfs_entry md_min_sync
=
4454 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4457 max_sync_show(struct mddev
*mddev
, char *page
)
4459 if (mddev
->resync_max
== MaxSector
)
4460 return sprintf(page
, "max\n");
4462 return sprintf(page
, "%llu\n",
4463 (unsigned long long)mddev
->resync_max
);
4466 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4468 if (strncmp(buf
, "max", 3) == 0)
4469 mddev
->resync_max
= MaxSector
;
4471 unsigned long long max
;
4472 if (strict_strtoull(buf
, 10, &max
))
4474 if (max
< mddev
->resync_min
)
4476 if (max
< mddev
->resync_max
&&
4478 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4481 /* Must be a multiple of chunk_size */
4482 if (mddev
->chunk_sectors
) {
4483 sector_t temp
= max
;
4484 if (sector_div(temp
, mddev
->chunk_sectors
))
4487 mddev
->resync_max
= max
;
4489 wake_up(&mddev
->recovery_wait
);
4493 static struct md_sysfs_entry md_max_sync
=
4494 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4497 suspend_lo_show(struct mddev
*mddev
, char *page
)
4499 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4503 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4506 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4507 unsigned long long old
= mddev
->suspend_lo
;
4509 if (mddev
->pers
== NULL
||
4510 mddev
->pers
->quiesce
== NULL
)
4512 if (buf
== e
|| (*e
&& *e
!= '\n'))
4515 mddev
->suspend_lo
= new;
4517 /* Shrinking suspended region */
4518 mddev
->pers
->quiesce(mddev
, 2);
4520 /* Expanding suspended region - need to wait */
4521 mddev
->pers
->quiesce(mddev
, 1);
4522 mddev
->pers
->quiesce(mddev
, 0);
4526 static struct md_sysfs_entry md_suspend_lo
=
4527 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4531 suspend_hi_show(struct mddev
*mddev
, char *page
)
4533 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4537 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4540 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4541 unsigned long long old
= mddev
->suspend_hi
;
4543 if (mddev
->pers
== NULL
||
4544 mddev
->pers
->quiesce
== NULL
)
4546 if (buf
== e
|| (*e
&& *e
!= '\n'))
4549 mddev
->suspend_hi
= new;
4551 /* Shrinking suspended region */
4552 mddev
->pers
->quiesce(mddev
, 2);
4554 /* Expanding suspended region - need to wait */
4555 mddev
->pers
->quiesce(mddev
, 1);
4556 mddev
->pers
->quiesce(mddev
, 0);
4560 static struct md_sysfs_entry md_suspend_hi
=
4561 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4564 reshape_position_show(struct mddev
*mddev
, char *page
)
4566 if (mddev
->reshape_position
!= MaxSector
)
4567 return sprintf(page
, "%llu\n",
4568 (unsigned long long)mddev
->reshape_position
);
4569 strcpy(page
, "none\n");
4574 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4576 struct md_rdev
*rdev
;
4578 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4581 if (buf
== e
|| (*e
&& *e
!= '\n'))
4583 mddev
->reshape_position
= new;
4584 mddev
->delta_disks
= 0;
4585 mddev
->reshape_backwards
= 0;
4586 mddev
->new_level
= mddev
->level
;
4587 mddev
->new_layout
= mddev
->layout
;
4588 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4589 rdev_for_each(rdev
, mddev
)
4590 rdev
->new_data_offset
= rdev
->data_offset
;
4594 static struct md_sysfs_entry md_reshape_position
=
4595 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4596 reshape_position_store
);
4599 reshape_direction_show(struct mddev
*mddev
, char *page
)
4601 return sprintf(page
, "%s\n",
4602 mddev
->reshape_backwards
? "backwards" : "forwards");
4606 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4609 if (cmd_match(buf
, "forwards"))
4611 else if (cmd_match(buf
, "backwards"))
4615 if (mddev
->reshape_backwards
== backwards
)
4618 /* check if we are allowed to change */
4619 if (mddev
->delta_disks
)
4622 if (mddev
->persistent
&&
4623 mddev
->major_version
== 0)
4626 mddev
->reshape_backwards
= backwards
;
4630 static struct md_sysfs_entry md_reshape_direction
=
4631 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4632 reshape_direction_store
);
4635 array_size_show(struct mddev
*mddev
, char *page
)
4637 if (mddev
->external_size
)
4638 return sprintf(page
, "%llu\n",
4639 (unsigned long long)mddev
->array_sectors
/2);
4641 return sprintf(page
, "default\n");
4645 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4649 if (strncmp(buf
, "default", 7) == 0) {
4651 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4653 sectors
= mddev
->array_sectors
;
4655 mddev
->external_size
= 0;
4657 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4659 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4662 mddev
->external_size
= 1;
4665 mddev
->array_sectors
= sectors
;
4667 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4668 revalidate_disk(mddev
->gendisk
);
4673 static struct md_sysfs_entry md_array_size
=
4674 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4677 static struct attribute
*md_default_attrs
[] = {
4680 &md_raid_disks
.attr
,
4681 &md_chunk_size
.attr
,
4683 &md_resync_start
.attr
,
4685 &md_new_device
.attr
,
4686 &md_safe_delay
.attr
,
4687 &md_array_state
.attr
,
4688 &md_reshape_position
.attr
,
4689 &md_reshape_direction
.attr
,
4690 &md_array_size
.attr
,
4691 &max_corr_read_errors
.attr
,
4695 static struct attribute
*md_redundancy_attrs
[] = {
4697 &md_mismatches
.attr
,
4700 &md_sync_speed
.attr
,
4701 &md_sync_force_parallel
.attr
,
4702 &md_sync_completed
.attr
,
4705 &md_suspend_lo
.attr
,
4706 &md_suspend_hi
.attr
,
4711 static struct attribute_group md_redundancy_group
= {
4713 .attrs
= md_redundancy_attrs
,
4718 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4720 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4721 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4726 spin_lock(&all_mddevs_lock
);
4727 if (list_empty(&mddev
->all_mddevs
)) {
4728 spin_unlock(&all_mddevs_lock
);
4732 spin_unlock(&all_mddevs_lock
);
4734 rv
= mddev_lock(mddev
);
4736 rv
= entry
->show(mddev
, page
);
4737 mddev_unlock(mddev
);
4744 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4745 const char *page
, size_t length
)
4747 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4748 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4753 if (!capable(CAP_SYS_ADMIN
))
4755 spin_lock(&all_mddevs_lock
);
4756 if (list_empty(&mddev
->all_mddevs
)) {
4757 spin_unlock(&all_mddevs_lock
);
4761 spin_unlock(&all_mddevs_lock
);
4762 if (entry
->store
== new_dev_store
)
4763 flush_workqueue(md_misc_wq
);
4764 rv
= mddev_lock(mddev
);
4766 rv
= entry
->store(mddev
, page
, length
);
4767 mddev_unlock(mddev
);
4773 static void md_free(struct kobject
*ko
)
4775 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4777 if (mddev
->sysfs_state
)
4778 sysfs_put(mddev
->sysfs_state
);
4780 if (mddev
->gendisk
) {
4781 del_gendisk(mddev
->gendisk
);
4782 put_disk(mddev
->gendisk
);
4785 blk_cleanup_queue(mddev
->queue
);
4790 static const struct sysfs_ops md_sysfs_ops
= {
4791 .show
= md_attr_show
,
4792 .store
= md_attr_store
,
4794 static struct kobj_type md_ktype
= {
4796 .sysfs_ops
= &md_sysfs_ops
,
4797 .default_attrs
= md_default_attrs
,
4802 static void mddev_delayed_delete(struct work_struct
*ws
)
4804 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4806 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4807 kobject_del(&mddev
->kobj
);
4808 kobject_put(&mddev
->kobj
);
4811 static int md_alloc(dev_t dev
, char *name
)
4813 static DEFINE_MUTEX(disks_mutex
);
4814 struct mddev
*mddev
= mddev_find(dev
);
4815 struct gendisk
*disk
;
4824 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4825 shift
= partitioned
? MdpMinorShift
: 0;
4826 unit
= MINOR(mddev
->unit
) >> shift
;
4828 /* wait for any previous instance of this device to be
4829 * completely removed (mddev_delayed_delete).
4831 flush_workqueue(md_misc_wq
);
4833 mutex_lock(&disks_mutex
);
4839 /* Need to ensure that 'name' is not a duplicate.
4841 struct mddev
*mddev2
;
4842 spin_lock(&all_mddevs_lock
);
4844 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4845 if (mddev2
->gendisk
&&
4846 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4847 spin_unlock(&all_mddevs_lock
);
4850 spin_unlock(&all_mddevs_lock
);
4854 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4857 mddev
->queue
->queuedata
= mddev
;
4859 blk_queue_make_request(mddev
->queue
, md_make_request
);
4860 blk_set_stacking_limits(&mddev
->queue
->limits
);
4862 disk
= alloc_disk(1 << shift
);
4864 blk_cleanup_queue(mddev
->queue
);
4865 mddev
->queue
= NULL
;
4868 disk
->major
= MAJOR(mddev
->unit
);
4869 disk
->first_minor
= unit
<< shift
;
4871 strcpy(disk
->disk_name
, name
);
4872 else if (partitioned
)
4873 sprintf(disk
->disk_name
, "md_d%d", unit
);
4875 sprintf(disk
->disk_name
, "md%d", unit
);
4876 disk
->fops
= &md_fops
;
4877 disk
->private_data
= mddev
;
4878 disk
->queue
= mddev
->queue
;
4879 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4880 /* Allow extended partitions. This makes the
4881 * 'mdp' device redundant, but we can't really
4884 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4885 mddev
->gendisk
= disk
;
4886 /* As soon as we call add_disk(), another thread could get
4887 * through to md_open, so make sure it doesn't get too far
4889 mutex_lock(&mddev
->open_mutex
);
4892 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4893 &disk_to_dev(disk
)->kobj
, "%s", "md");
4895 /* This isn't possible, but as kobject_init_and_add is marked
4896 * __must_check, we must do something with the result
4898 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4902 if (mddev
->kobj
.sd
&&
4903 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4904 printk(KERN_DEBUG
"pointless warning\n");
4905 mutex_unlock(&mddev
->open_mutex
);
4907 mutex_unlock(&disks_mutex
);
4908 if (!error
&& mddev
->kobj
.sd
) {
4909 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4910 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4916 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4918 md_alloc(dev
, NULL
);
4922 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4924 /* val must be "md_*" where * is not all digits.
4925 * We allocate an array with a large free minor number, and
4926 * set the name to val. val must not already be an active name.
4928 int len
= strlen(val
);
4929 char buf
[DISK_NAME_LEN
];
4931 while (len
&& val
[len
-1] == '\n')
4933 if (len
>= DISK_NAME_LEN
)
4935 strlcpy(buf
, val
, len
+1);
4936 if (strncmp(buf
, "md_", 3) != 0)
4938 return md_alloc(0, buf
);
4941 static void md_safemode_timeout(unsigned long data
)
4943 struct mddev
*mddev
= (struct mddev
*) data
;
4945 if (!atomic_read(&mddev
->writes_pending
)) {
4946 mddev
->safemode
= 1;
4947 if (mddev
->external
)
4948 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4950 md_wakeup_thread(mddev
->thread
);
4953 static int start_dirty_degraded
;
4955 int md_run(struct mddev
*mddev
)
4958 struct md_rdev
*rdev
;
4959 struct md_personality
*pers
;
4961 if (list_empty(&mddev
->disks
))
4962 /* cannot run an array with no devices.. */
4967 /* Cannot run until previous stop completes properly */
4968 if (mddev
->sysfs_active
)
4972 * Analyze all RAID superblock(s)
4974 if (!mddev
->raid_disks
) {
4975 if (!mddev
->persistent
)
4980 if (mddev
->level
!= LEVEL_NONE
)
4981 request_module("md-level-%d", mddev
->level
);
4982 else if (mddev
->clevel
[0])
4983 request_module("md-%s", mddev
->clevel
);
4986 * Drop all container device buffers, from now on
4987 * the only valid external interface is through the md
4990 rdev_for_each(rdev
, mddev
) {
4991 if (test_bit(Faulty
, &rdev
->flags
))
4993 sync_blockdev(rdev
->bdev
);
4994 invalidate_bdev(rdev
->bdev
);
4996 /* perform some consistency tests on the device.
4997 * We don't want the data to overlap the metadata,
4998 * Internal Bitmap issues have been handled elsewhere.
5000 if (rdev
->meta_bdev
) {
5001 /* Nothing to check */;
5002 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5003 if (mddev
->dev_sectors
&&
5004 rdev
->data_offset
+ mddev
->dev_sectors
5006 printk("md: %s: data overlaps metadata\n",
5011 if (rdev
->sb_start
+ rdev
->sb_size
/512
5012 > rdev
->data_offset
) {
5013 printk("md: %s: metadata overlaps data\n",
5018 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5021 if (mddev
->bio_set
== NULL
)
5022 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5024 spin_lock(&pers_lock
);
5025 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5026 if (!pers
|| !try_module_get(pers
->owner
)) {
5027 spin_unlock(&pers_lock
);
5028 if (mddev
->level
!= LEVEL_NONE
)
5029 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5032 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5037 spin_unlock(&pers_lock
);
5038 if (mddev
->level
!= pers
->level
) {
5039 mddev
->level
= pers
->level
;
5040 mddev
->new_level
= pers
->level
;
5042 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5044 if (mddev
->reshape_position
!= MaxSector
&&
5045 pers
->start_reshape
== NULL
) {
5046 /* This personality cannot handle reshaping... */
5048 module_put(pers
->owner
);
5052 if (pers
->sync_request
) {
5053 /* Warn if this is a potentially silly
5056 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5057 struct md_rdev
*rdev2
;
5060 rdev_for_each(rdev
, mddev
)
5061 rdev_for_each(rdev2
, mddev
) {
5063 rdev
->bdev
->bd_contains
==
5064 rdev2
->bdev
->bd_contains
) {
5066 "%s: WARNING: %s appears to be"
5067 " on the same physical disk as"
5070 bdevname(rdev
->bdev
,b
),
5071 bdevname(rdev2
->bdev
,b2
));
5078 "True protection against single-disk"
5079 " failure might be compromised.\n");
5082 mddev
->recovery
= 0;
5083 /* may be over-ridden by personality */
5084 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5086 mddev
->ok_start_degraded
= start_dirty_degraded
;
5088 if (start_readonly
&& mddev
->ro
== 0)
5089 mddev
->ro
= 2; /* read-only, but switch on first write */
5091 err
= mddev
->pers
->run(mddev
);
5093 printk(KERN_ERR
"md: pers->run() failed ...\n");
5094 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5095 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5096 " but 'external_size' not in effect?\n", __func__
);
5098 "md: invalid array_size %llu > default size %llu\n",
5099 (unsigned long long)mddev
->array_sectors
/ 2,
5100 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5102 mddev
->pers
->stop(mddev
);
5104 if (err
== 0 && mddev
->pers
->sync_request
&&
5105 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5106 err
= bitmap_create(mddev
);
5108 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5109 mdname(mddev
), err
);
5110 mddev
->pers
->stop(mddev
);
5114 module_put(mddev
->pers
->owner
);
5116 bitmap_destroy(mddev
);
5119 if (mddev
->pers
->sync_request
) {
5120 if (mddev
->kobj
.sd
&&
5121 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5123 "md: cannot register extra attributes for %s\n",
5125 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5126 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5129 atomic_set(&mddev
->writes_pending
,0);
5130 atomic_set(&mddev
->max_corr_read_errors
,
5131 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5132 mddev
->safemode
= 0;
5133 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5134 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5135 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5139 rdev_for_each(rdev
, mddev
)
5140 if (rdev
->raid_disk
>= 0)
5141 if (sysfs_link_rdev(mddev
, rdev
))
5142 /* failure here is OK */;
5144 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5147 md_update_sb(mddev
, 0);
5149 md_new_event(mddev
);
5150 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5151 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5152 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5155 EXPORT_SYMBOL_GPL(md_run
);
5157 static int do_md_run(struct mddev
*mddev
)
5161 err
= md_run(mddev
);
5164 err
= bitmap_load(mddev
);
5166 bitmap_destroy(mddev
);
5170 md_wakeup_thread(mddev
->thread
);
5171 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5173 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5174 revalidate_disk(mddev
->gendisk
);
5176 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5181 static int restart_array(struct mddev
*mddev
)
5183 struct gendisk
*disk
= mddev
->gendisk
;
5185 /* Complain if it has no devices */
5186 if (list_empty(&mddev
->disks
))
5192 mddev
->safemode
= 0;
5194 set_disk_ro(disk
, 0);
5195 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5197 /* Kick recovery or resync if necessary */
5198 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5199 md_wakeup_thread(mddev
->thread
);
5200 md_wakeup_thread(mddev
->sync_thread
);
5201 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5205 /* similar to deny_write_access, but accounts for our holding a reference
5206 * to the file ourselves */
5207 static int deny_bitmap_write_access(struct file
* file
)
5209 struct inode
*inode
= file
->f_mapping
->host
;
5211 spin_lock(&inode
->i_lock
);
5212 if (atomic_read(&inode
->i_writecount
) > 1) {
5213 spin_unlock(&inode
->i_lock
);
5216 atomic_set(&inode
->i_writecount
, -1);
5217 spin_unlock(&inode
->i_lock
);
5222 void restore_bitmap_write_access(struct file
*file
)
5224 struct inode
*inode
= file
->f_mapping
->host
;
5226 spin_lock(&inode
->i_lock
);
5227 atomic_set(&inode
->i_writecount
, 1);
5228 spin_unlock(&inode
->i_lock
);
5231 static void md_clean(struct mddev
*mddev
)
5233 mddev
->array_sectors
= 0;
5234 mddev
->external_size
= 0;
5235 mddev
->dev_sectors
= 0;
5236 mddev
->raid_disks
= 0;
5237 mddev
->recovery_cp
= 0;
5238 mddev
->resync_min
= 0;
5239 mddev
->resync_max
= MaxSector
;
5240 mddev
->reshape_position
= MaxSector
;
5241 mddev
->external
= 0;
5242 mddev
->persistent
= 0;
5243 mddev
->level
= LEVEL_NONE
;
5244 mddev
->clevel
[0] = 0;
5247 mddev
->metadata_type
[0] = 0;
5248 mddev
->chunk_sectors
= 0;
5249 mddev
->ctime
= mddev
->utime
= 0;
5251 mddev
->max_disks
= 0;
5253 mddev
->can_decrease_events
= 0;
5254 mddev
->delta_disks
= 0;
5255 mddev
->reshape_backwards
= 0;
5256 mddev
->new_level
= LEVEL_NONE
;
5257 mddev
->new_layout
= 0;
5258 mddev
->new_chunk_sectors
= 0;
5259 mddev
->curr_resync
= 0;
5260 atomic64_set(&mddev
->resync_mismatches
, 0);
5261 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5262 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5263 mddev
->recovery
= 0;
5266 mddev
->degraded
= 0;
5267 mddev
->safemode
= 0;
5268 mddev
->merge_check_needed
= 0;
5269 mddev
->bitmap_info
.offset
= 0;
5270 mddev
->bitmap_info
.default_offset
= 0;
5271 mddev
->bitmap_info
.default_space
= 0;
5272 mddev
->bitmap_info
.chunksize
= 0;
5273 mddev
->bitmap_info
.daemon_sleep
= 0;
5274 mddev
->bitmap_info
.max_write_behind
= 0;
5277 static void __md_stop_writes(struct mddev
*mddev
)
5279 if (mddev
->sync_thread
) {
5280 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5281 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5282 reap_sync_thread(mddev
);
5285 del_timer_sync(&mddev
->safemode_timer
);
5287 bitmap_flush(mddev
);
5288 md_super_wait(mddev
);
5290 if (!mddev
->in_sync
|| mddev
->flags
) {
5291 /* mark array as shutdown cleanly */
5293 md_update_sb(mddev
, 1);
5297 void md_stop_writes(struct mddev
*mddev
)
5300 __md_stop_writes(mddev
);
5301 mddev_unlock(mddev
);
5303 EXPORT_SYMBOL_GPL(md_stop_writes
);
5305 static void __md_stop(struct mddev
*mddev
)
5308 mddev
->pers
->stop(mddev
);
5309 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5310 mddev
->to_remove
= &md_redundancy_group
;
5311 module_put(mddev
->pers
->owner
);
5313 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5316 void md_stop(struct mddev
*mddev
)
5318 /* stop the array and free an attached data structures.
5319 * This is called from dm-raid
5322 bitmap_destroy(mddev
);
5324 bioset_free(mddev
->bio_set
);
5327 EXPORT_SYMBOL_GPL(md_stop
);
5329 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5332 mutex_lock(&mddev
->open_mutex
);
5333 if (atomic_read(&mddev
->openers
) > !!bdev
) {
5334 printk("md: %s still in use.\n",mdname(mddev
));
5339 sync_blockdev(bdev
);
5341 __md_stop_writes(mddev
);
5347 set_disk_ro(mddev
->gendisk
, 1);
5348 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5349 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5353 mutex_unlock(&mddev
->open_mutex
);
5358 * 0 - completely stop and dis-assemble array
5359 * 2 - stop but do not disassemble array
5361 static int do_md_stop(struct mddev
* mddev
, int mode
,
5362 struct block_device
*bdev
)
5364 struct gendisk
*disk
= mddev
->gendisk
;
5365 struct md_rdev
*rdev
;
5367 mutex_lock(&mddev
->open_mutex
);
5368 if (atomic_read(&mddev
->openers
) > !!bdev
||
5369 mddev
->sysfs_active
) {
5370 printk("md: %s still in use.\n",mdname(mddev
));
5371 mutex_unlock(&mddev
->open_mutex
);
5375 /* It is possible IO was issued on some other
5376 * open file which was closed before we took ->open_mutex.
5377 * As that was not the last close __blkdev_put will not
5378 * have called sync_blockdev, so we must.
5380 sync_blockdev(bdev
);
5384 set_disk_ro(disk
, 0);
5386 __md_stop_writes(mddev
);
5388 mddev
->queue
->merge_bvec_fn
= NULL
;
5389 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5391 /* tell userspace to handle 'inactive' */
5392 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5394 rdev_for_each(rdev
, mddev
)
5395 if (rdev
->raid_disk
>= 0)
5396 sysfs_unlink_rdev(mddev
, rdev
);
5398 set_capacity(disk
, 0);
5399 mutex_unlock(&mddev
->open_mutex
);
5401 revalidate_disk(disk
);
5406 mutex_unlock(&mddev
->open_mutex
);
5408 * Free resources if final stop
5411 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5413 bitmap_destroy(mddev
);
5414 if (mddev
->bitmap_info
.file
) {
5415 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5416 fput(mddev
->bitmap_info
.file
);
5417 mddev
->bitmap_info
.file
= NULL
;
5419 mddev
->bitmap_info
.offset
= 0;
5421 export_array(mddev
);
5424 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5425 if (mddev
->hold_active
== UNTIL_STOP
)
5426 mddev
->hold_active
= 0;
5428 blk_integrity_unregister(disk
);
5429 md_new_event(mddev
);
5430 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5435 static void autorun_array(struct mddev
*mddev
)
5437 struct md_rdev
*rdev
;
5440 if (list_empty(&mddev
->disks
))
5443 printk(KERN_INFO
"md: running: ");
5445 rdev_for_each(rdev
, mddev
) {
5446 char b
[BDEVNAME_SIZE
];
5447 printk("<%s>", bdevname(rdev
->bdev
,b
));
5451 err
= do_md_run(mddev
);
5453 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5454 do_md_stop(mddev
, 0, NULL
);
5459 * lets try to run arrays based on all disks that have arrived
5460 * until now. (those are in pending_raid_disks)
5462 * the method: pick the first pending disk, collect all disks with
5463 * the same UUID, remove all from the pending list and put them into
5464 * the 'same_array' list. Then order this list based on superblock
5465 * update time (freshest comes first), kick out 'old' disks and
5466 * compare superblocks. If everything's fine then run it.
5468 * If "unit" is allocated, then bump its reference count
5470 static void autorun_devices(int part
)
5472 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5473 struct mddev
*mddev
;
5474 char b
[BDEVNAME_SIZE
];
5476 printk(KERN_INFO
"md: autorun ...\n");
5477 while (!list_empty(&pending_raid_disks
)) {
5480 LIST_HEAD(candidates
);
5481 rdev0
= list_entry(pending_raid_disks
.next
,
5482 struct md_rdev
, same_set
);
5484 printk(KERN_INFO
"md: considering %s ...\n",
5485 bdevname(rdev0
->bdev
,b
));
5486 INIT_LIST_HEAD(&candidates
);
5487 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5488 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5489 printk(KERN_INFO
"md: adding %s ...\n",
5490 bdevname(rdev
->bdev
,b
));
5491 list_move(&rdev
->same_set
, &candidates
);
5494 * now we have a set of devices, with all of them having
5495 * mostly sane superblocks. It's time to allocate the
5499 dev
= MKDEV(mdp_major
,
5500 rdev0
->preferred_minor
<< MdpMinorShift
);
5501 unit
= MINOR(dev
) >> MdpMinorShift
;
5503 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5506 if (rdev0
->preferred_minor
!= unit
) {
5507 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5508 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5512 md_probe(dev
, NULL
, NULL
);
5513 mddev
= mddev_find(dev
);
5514 if (!mddev
|| !mddev
->gendisk
) {
5518 "md: cannot allocate memory for md drive.\n");
5521 if (mddev_lock(mddev
))
5522 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5524 else if (mddev
->raid_disks
|| mddev
->major_version
5525 || !list_empty(&mddev
->disks
)) {
5527 "md: %s already running, cannot run %s\n",
5528 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5529 mddev_unlock(mddev
);
5531 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5532 mddev
->persistent
= 1;
5533 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5534 list_del_init(&rdev
->same_set
);
5535 if (bind_rdev_to_array(rdev
, mddev
))
5538 autorun_array(mddev
);
5539 mddev_unlock(mddev
);
5541 /* on success, candidates will be empty, on error
5544 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5545 list_del_init(&rdev
->same_set
);
5550 printk(KERN_INFO
"md: ... autorun DONE.\n");
5552 #endif /* !MODULE */
5554 static int get_version(void __user
* arg
)
5558 ver
.major
= MD_MAJOR_VERSION
;
5559 ver
.minor
= MD_MINOR_VERSION
;
5560 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5562 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5568 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5570 mdu_array_info_t info
;
5571 int nr
,working
,insync
,failed
,spare
;
5572 struct md_rdev
*rdev
;
5574 nr
= working
= insync
= failed
= spare
= 0;
5576 rdev_for_each_rcu(rdev
, mddev
) {
5578 if (test_bit(Faulty
, &rdev
->flags
))
5582 if (test_bit(In_sync
, &rdev
->flags
))
5590 info
.major_version
= mddev
->major_version
;
5591 info
.minor_version
= mddev
->minor_version
;
5592 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5593 info
.ctime
= mddev
->ctime
;
5594 info
.level
= mddev
->level
;
5595 info
.size
= mddev
->dev_sectors
/ 2;
5596 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5599 info
.raid_disks
= mddev
->raid_disks
;
5600 info
.md_minor
= mddev
->md_minor
;
5601 info
.not_persistent
= !mddev
->persistent
;
5603 info
.utime
= mddev
->utime
;
5606 info
.state
= (1<<MD_SB_CLEAN
);
5607 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5608 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5609 info
.active_disks
= insync
;
5610 info
.working_disks
= working
;
5611 info
.failed_disks
= failed
;
5612 info
.spare_disks
= spare
;
5614 info
.layout
= mddev
->layout
;
5615 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5617 if (copy_to_user(arg
, &info
, sizeof(info
)))
5623 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5625 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5626 char *ptr
, *buf
= NULL
;
5629 if (md_allow_write(mddev
))
5630 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5632 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5637 /* bitmap disabled, zero the first byte and copy out */
5638 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5639 file
->pathname
[0] = '\0';
5643 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5647 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5648 buf
, sizeof(file
->pathname
));
5652 strcpy(file
->pathname
, ptr
);
5656 if (copy_to_user(arg
, file
, sizeof(*file
)))
5664 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5666 mdu_disk_info_t info
;
5667 struct md_rdev
*rdev
;
5669 if (copy_from_user(&info
, arg
, sizeof(info
)))
5673 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5675 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5676 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5677 info
.raid_disk
= rdev
->raid_disk
;
5679 if (test_bit(Faulty
, &rdev
->flags
))
5680 info
.state
|= (1<<MD_DISK_FAULTY
);
5681 else if (test_bit(In_sync
, &rdev
->flags
)) {
5682 info
.state
|= (1<<MD_DISK_ACTIVE
);
5683 info
.state
|= (1<<MD_DISK_SYNC
);
5685 if (test_bit(WriteMostly
, &rdev
->flags
))
5686 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5688 info
.major
= info
.minor
= 0;
5689 info
.raid_disk
= -1;
5690 info
.state
= (1<<MD_DISK_REMOVED
);
5694 if (copy_to_user(arg
, &info
, sizeof(info
)))
5700 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5702 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5703 struct md_rdev
*rdev
;
5704 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5706 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5709 if (!mddev
->raid_disks
) {
5711 /* expecting a device which has a superblock */
5712 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5715 "md: md_import_device returned %ld\n",
5717 return PTR_ERR(rdev
);
5719 if (!list_empty(&mddev
->disks
)) {
5720 struct md_rdev
*rdev0
5721 = list_entry(mddev
->disks
.next
,
5722 struct md_rdev
, same_set
);
5723 err
= super_types
[mddev
->major_version
]
5724 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5727 "md: %s has different UUID to %s\n",
5728 bdevname(rdev
->bdev
,b
),
5729 bdevname(rdev0
->bdev
,b2
));
5734 err
= bind_rdev_to_array(rdev
, mddev
);
5741 * add_new_disk can be used once the array is assembled
5742 * to add "hot spares". They must already have a superblock
5747 if (!mddev
->pers
->hot_add_disk
) {
5749 "%s: personality does not support diskops!\n",
5753 if (mddev
->persistent
)
5754 rdev
= md_import_device(dev
, mddev
->major_version
,
5755 mddev
->minor_version
);
5757 rdev
= md_import_device(dev
, -1, -1);
5760 "md: md_import_device returned %ld\n",
5762 return PTR_ERR(rdev
);
5764 /* set saved_raid_disk if appropriate */
5765 if (!mddev
->persistent
) {
5766 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5767 info
->raid_disk
< mddev
->raid_disks
) {
5768 rdev
->raid_disk
= info
->raid_disk
;
5769 set_bit(In_sync
, &rdev
->flags
);
5771 rdev
->raid_disk
= -1;
5773 super_types
[mddev
->major_version
].
5774 validate_super(mddev
, rdev
);
5775 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5776 rdev
->raid_disk
!= info
->raid_disk
) {
5777 /* This was a hot-add request, but events doesn't
5778 * match, so reject it.
5784 if (test_bit(In_sync
, &rdev
->flags
))
5785 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5787 rdev
->saved_raid_disk
= -1;
5789 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5790 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5791 set_bit(WriteMostly
, &rdev
->flags
);
5793 clear_bit(WriteMostly
, &rdev
->flags
);
5795 rdev
->raid_disk
= -1;
5796 err
= bind_rdev_to_array(rdev
, mddev
);
5797 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5798 /* If there is hot_add_disk but no hot_remove_disk
5799 * then added disks for geometry changes,
5800 * and should be added immediately.
5802 super_types
[mddev
->major_version
].
5803 validate_super(mddev
, rdev
);
5804 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5806 unbind_rdev_from_array(rdev
);
5811 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5813 md_update_sb(mddev
, 1);
5814 if (mddev
->degraded
)
5815 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5816 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5818 md_new_event(mddev
);
5819 md_wakeup_thread(mddev
->thread
);
5823 /* otherwise, add_new_disk is only allowed
5824 * for major_version==0 superblocks
5826 if (mddev
->major_version
!= 0) {
5827 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5832 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5834 rdev
= md_import_device(dev
, -1, 0);
5837 "md: error, md_import_device() returned %ld\n",
5839 return PTR_ERR(rdev
);
5841 rdev
->desc_nr
= info
->number
;
5842 if (info
->raid_disk
< mddev
->raid_disks
)
5843 rdev
->raid_disk
= info
->raid_disk
;
5845 rdev
->raid_disk
= -1;
5847 if (rdev
->raid_disk
< mddev
->raid_disks
)
5848 if (info
->state
& (1<<MD_DISK_SYNC
))
5849 set_bit(In_sync
, &rdev
->flags
);
5851 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5852 set_bit(WriteMostly
, &rdev
->flags
);
5854 if (!mddev
->persistent
) {
5855 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5856 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5858 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5859 rdev
->sectors
= rdev
->sb_start
;
5861 err
= bind_rdev_to_array(rdev
, mddev
);
5871 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5873 char b
[BDEVNAME_SIZE
];
5874 struct md_rdev
*rdev
;
5876 rdev
= find_rdev(mddev
, dev
);
5880 if (rdev
->raid_disk
>= 0)
5883 kick_rdev_from_array(rdev
);
5884 md_update_sb(mddev
, 1);
5885 md_new_event(mddev
);
5889 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5890 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5894 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5896 char b
[BDEVNAME_SIZE
];
5898 struct md_rdev
*rdev
;
5903 if (mddev
->major_version
!= 0) {
5904 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5905 " version-0 superblocks.\n",
5909 if (!mddev
->pers
->hot_add_disk
) {
5911 "%s: personality does not support diskops!\n",
5916 rdev
= md_import_device(dev
, -1, 0);
5919 "md: error, md_import_device() returned %ld\n",
5924 if (mddev
->persistent
)
5925 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5927 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5929 rdev
->sectors
= rdev
->sb_start
;
5931 if (test_bit(Faulty
, &rdev
->flags
)) {
5933 "md: can not hot-add faulty %s disk to %s!\n",
5934 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5938 clear_bit(In_sync
, &rdev
->flags
);
5940 rdev
->saved_raid_disk
= -1;
5941 err
= bind_rdev_to_array(rdev
, mddev
);
5946 * The rest should better be atomic, we can have disk failures
5947 * noticed in interrupt contexts ...
5950 rdev
->raid_disk
= -1;
5952 md_update_sb(mddev
, 1);
5955 * Kick recovery, maybe this spare has to be added to the
5956 * array immediately.
5958 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5959 md_wakeup_thread(mddev
->thread
);
5960 md_new_event(mddev
);
5968 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5973 if (!mddev
->pers
->quiesce
)
5975 if (mddev
->recovery
|| mddev
->sync_thread
)
5977 /* we should be able to change the bitmap.. */
5983 return -EEXIST
; /* cannot add when bitmap is present */
5984 mddev
->bitmap_info
.file
= fget(fd
);
5986 if (mddev
->bitmap_info
.file
== NULL
) {
5987 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5992 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5994 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5996 fput(mddev
->bitmap_info
.file
);
5997 mddev
->bitmap_info
.file
= NULL
;
6000 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6001 } else if (mddev
->bitmap
== NULL
)
6002 return -ENOENT
; /* cannot remove what isn't there */
6005 mddev
->pers
->quiesce(mddev
, 1);
6007 err
= bitmap_create(mddev
);
6009 err
= bitmap_load(mddev
);
6011 if (fd
< 0 || err
) {
6012 bitmap_destroy(mddev
);
6013 fd
= -1; /* make sure to put the file */
6015 mddev
->pers
->quiesce(mddev
, 0);
6018 if (mddev
->bitmap_info
.file
) {
6019 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6020 fput(mddev
->bitmap_info
.file
);
6022 mddev
->bitmap_info
.file
= NULL
;
6029 * set_array_info is used two different ways
6030 * The original usage is when creating a new array.
6031 * In this usage, raid_disks is > 0 and it together with
6032 * level, size, not_persistent,layout,chunksize determine the
6033 * shape of the array.
6034 * This will always create an array with a type-0.90.0 superblock.
6035 * The newer usage is when assembling an array.
6036 * In this case raid_disks will be 0, and the major_version field is
6037 * use to determine which style super-blocks are to be found on the devices.
6038 * The minor and patch _version numbers are also kept incase the
6039 * super_block handler wishes to interpret them.
6041 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6044 if (info
->raid_disks
== 0) {
6045 /* just setting version number for superblock loading */
6046 if (info
->major_version
< 0 ||
6047 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6048 super_types
[info
->major_version
].name
== NULL
) {
6049 /* maybe try to auto-load a module? */
6051 "md: superblock version %d not known\n",
6052 info
->major_version
);
6055 mddev
->major_version
= info
->major_version
;
6056 mddev
->minor_version
= info
->minor_version
;
6057 mddev
->patch_version
= info
->patch_version
;
6058 mddev
->persistent
= !info
->not_persistent
;
6059 /* ensure mddev_put doesn't delete this now that there
6060 * is some minimal configuration.
6062 mddev
->ctime
= get_seconds();
6065 mddev
->major_version
= MD_MAJOR_VERSION
;
6066 mddev
->minor_version
= MD_MINOR_VERSION
;
6067 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6068 mddev
->ctime
= get_seconds();
6070 mddev
->level
= info
->level
;
6071 mddev
->clevel
[0] = 0;
6072 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6073 mddev
->raid_disks
= info
->raid_disks
;
6074 /* don't set md_minor, it is determined by which /dev/md* was
6077 if (info
->state
& (1<<MD_SB_CLEAN
))
6078 mddev
->recovery_cp
= MaxSector
;
6080 mddev
->recovery_cp
= 0;
6081 mddev
->persistent
= ! info
->not_persistent
;
6082 mddev
->external
= 0;
6084 mddev
->layout
= info
->layout
;
6085 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6087 mddev
->max_disks
= MD_SB_DISKS
;
6089 if (mddev
->persistent
)
6091 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6093 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6094 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6095 mddev
->bitmap_info
.offset
= 0;
6097 mddev
->reshape_position
= MaxSector
;
6100 * Generate a 128 bit UUID
6102 get_random_bytes(mddev
->uuid
, 16);
6104 mddev
->new_level
= mddev
->level
;
6105 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6106 mddev
->new_layout
= mddev
->layout
;
6107 mddev
->delta_disks
= 0;
6108 mddev
->reshape_backwards
= 0;
6113 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6115 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6117 if (mddev
->external_size
)
6120 mddev
->array_sectors
= array_sectors
;
6122 EXPORT_SYMBOL(md_set_array_sectors
);
6124 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6126 struct md_rdev
*rdev
;
6128 int fit
= (num_sectors
== 0);
6130 if (mddev
->pers
->resize
== NULL
)
6132 /* The "num_sectors" is the number of sectors of each device that
6133 * is used. This can only make sense for arrays with redundancy.
6134 * linear and raid0 always use whatever space is available. We can only
6135 * consider changing this number if no resync or reconstruction is
6136 * happening, and if the new size is acceptable. It must fit before the
6137 * sb_start or, if that is <data_offset, it must fit before the size
6138 * of each device. If num_sectors is zero, we find the largest size
6141 if (mddev
->sync_thread
)
6144 rdev_for_each(rdev
, mddev
) {
6145 sector_t avail
= rdev
->sectors
;
6147 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6148 num_sectors
= avail
;
6149 if (avail
< num_sectors
)
6152 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6154 revalidate_disk(mddev
->gendisk
);
6158 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6161 struct md_rdev
*rdev
;
6162 /* change the number of raid disks */
6163 if (mddev
->pers
->check_reshape
== NULL
)
6165 if (raid_disks
<= 0 ||
6166 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6168 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6171 rdev_for_each(rdev
, mddev
) {
6172 if (mddev
->raid_disks
< raid_disks
&&
6173 rdev
->data_offset
< rdev
->new_data_offset
)
6175 if (mddev
->raid_disks
> raid_disks
&&
6176 rdev
->data_offset
> rdev
->new_data_offset
)
6180 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6181 if (mddev
->delta_disks
< 0)
6182 mddev
->reshape_backwards
= 1;
6183 else if (mddev
->delta_disks
> 0)
6184 mddev
->reshape_backwards
= 0;
6186 rv
= mddev
->pers
->check_reshape(mddev
);
6188 mddev
->delta_disks
= 0;
6189 mddev
->reshape_backwards
= 0;
6196 * update_array_info is used to change the configuration of an
6198 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6199 * fields in the info are checked against the array.
6200 * Any differences that cannot be handled will cause an error.
6201 * Normally, only one change can be managed at a time.
6203 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6209 /* calculate expected state,ignoring low bits */
6210 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6211 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6213 if (mddev
->major_version
!= info
->major_version
||
6214 mddev
->minor_version
!= info
->minor_version
||
6215 /* mddev->patch_version != info->patch_version || */
6216 mddev
->ctime
!= info
->ctime
||
6217 mddev
->level
!= info
->level
||
6218 /* mddev->layout != info->layout || */
6219 !mddev
->persistent
!= info
->not_persistent
||
6220 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6221 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6222 ((state
^info
->state
) & 0xfffffe00)
6225 /* Check there is only one change */
6226 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6228 if (mddev
->raid_disks
!= info
->raid_disks
)
6230 if (mddev
->layout
!= info
->layout
)
6232 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6239 if (mddev
->layout
!= info
->layout
) {
6241 * we don't need to do anything at the md level, the
6242 * personality will take care of it all.
6244 if (mddev
->pers
->check_reshape
== NULL
)
6247 mddev
->new_layout
= info
->layout
;
6248 rv
= mddev
->pers
->check_reshape(mddev
);
6250 mddev
->new_layout
= mddev
->layout
;
6254 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6255 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6257 if (mddev
->raid_disks
!= info
->raid_disks
)
6258 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6260 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6261 if (mddev
->pers
->quiesce
== NULL
)
6263 if (mddev
->recovery
|| mddev
->sync_thread
)
6265 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6266 /* add the bitmap */
6269 if (mddev
->bitmap_info
.default_offset
== 0)
6271 mddev
->bitmap_info
.offset
=
6272 mddev
->bitmap_info
.default_offset
;
6273 mddev
->bitmap_info
.space
=
6274 mddev
->bitmap_info
.default_space
;
6275 mddev
->pers
->quiesce(mddev
, 1);
6276 rv
= bitmap_create(mddev
);
6278 rv
= bitmap_load(mddev
);
6280 bitmap_destroy(mddev
);
6281 mddev
->pers
->quiesce(mddev
, 0);
6283 /* remove the bitmap */
6286 if (mddev
->bitmap
->storage
.file
)
6288 mddev
->pers
->quiesce(mddev
, 1);
6289 bitmap_destroy(mddev
);
6290 mddev
->pers
->quiesce(mddev
, 0);
6291 mddev
->bitmap_info
.offset
= 0;
6294 md_update_sb(mddev
, 1);
6298 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6300 struct md_rdev
*rdev
;
6303 if (mddev
->pers
== NULL
)
6307 rdev
= find_rdev_rcu(mddev
, dev
);
6311 md_error(mddev
, rdev
);
6312 if (!test_bit(Faulty
, &rdev
->flags
))
6320 * We have a problem here : there is no easy way to give a CHS
6321 * virtual geometry. We currently pretend that we have a 2 heads
6322 * 4 sectors (with a BIG number of cylinders...). This drives
6323 * dosfs just mad... ;-)
6325 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6327 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6331 geo
->cylinders
= mddev
->array_sectors
/ 8;
6335 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6336 unsigned int cmd
, unsigned long arg
)
6339 void __user
*argp
= (void __user
*)arg
;
6340 struct mddev
*mddev
= NULL
;
6345 case GET_ARRAY_INFO
:
6349 if (!capable(CAP_SYS_ADMIN
))
6354 * Commands dealing with the RAID driver but not any
6359 err
= get_version(argp
);
6362 case PRINT_RAID_DEBUG
:
6370 autostart_arrays(arg
);
6377 * Commands creating/starting a new array:
6380 mddev
= bdev
->bd_disk
->private_data
;
6387 /* Some actions do not requires the mutex */
6389 case GET_ARRAY_INFO
:
6390 if (!mddev
->raid_disks
&& !mddev
->external
)
6393 err
= get_array_info(mddev
, argp
);
6397 if (!mddev
->raid_disks
&& !mddev
->external
)
6400 err
= get_disk_info(mddev
, argp
);
6403 case SET_DISK_FAULTY
:
6404 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6408 if (cmd
== ADD_NEW_DISK
)
6409 /* need to ensure md_delayed_delete() has completed */
6410 flush_workqueue(md_misc_wq
);
6412 err
= mddev_lock(mddev
);
6415 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6420 if (cmd
== SET_ARRAY_INFO
) {
6421 mdu_array_info_t info
;
6423 memset(&info
, 0, sizeof(info
));
6424 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6429 err
= update_array_info(mddev
, &info
);
6431 printk(KERN_WARNING
"md: couldn't update"
6432 " array info. %d\n", err
);
6437 if (!list_empty(&mddev
->disks
)) {
6439 "md: array %s already has disks!\n",
6444 if (mddev
->raid_disks
) {
6446 "md: array %s already initialised!\n",
6451 err
= set_array_info(mddev
, &info
);
6453 printk(KERN_WARNING
"md: couldn't set"
6454 " array info. %d\n", err
);
6461 * Commands querying/configuring an existing array:
6463 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6464 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6465 if ((!mddev
->raid_disks
&& !mddev
->external
)
6466 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6467 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6468 && cmd
!= GET_BITMAP_FILE
) {
6474 * Commands even a read-only array can execute:
6477 case GET_BITMAP_FILE
:
6478 err
= get_bitmap_file(mddev
, argp
);
6481 case RESTART_ARRAY_RW
:
6482 err
= restart_array(mddev
);
6486 err
= do_md_stop(mddev
, 0, bdev
);
6490 err
= md_set_readonly(mddev
, bdev
);
6494 if (get_user(ro
, (int __user
*)(arg
))) {
6500 /* if the bdev is going readonly the value of mddev->ro
6501 * does not matter, no writes are coming
6506 /* are we are already prepared for writes? */
6510 /* transitioning to readauto need only happen for
6511 * arrays that call md_write_start
6514 err
= restart_array(mddev
);
6517 set_disk_ro(mddev
->gendisk
, 0);
6524 * The remaining ioctls are changing the state of the
6525 * superblock, so we do not allow them on read-only arrays.
6526 * However non-MD ioctls (e.g. get-size) will still come through
6527 * here and hit the 'default' below, so only disallow
6528 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6530 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6531 if (mddev
->ro
== 2) {
6533 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6534 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6535 /* mddev_unlock will wake thread */
6536 /* If a device failed while we were read-only, we
6537 * need to make sure the metadata is updated now.
6539 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6540 mddev_unlock(mddev
);
6541 wait_event(mddev
->sb_wait
,
6542 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6543 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6555 mdu_disk_info_t info
;
6556 if (copy_from_user(&info
, argp
, sizeof(info
)))
6559 err
= add_new_disk(mddev
, &info
);
6563 case HOT_REMOVE_DISK
:
6564 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6568 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6572 err
= do_md_run(mddev
);
6575 case SET_BITMAP_FILE
:
6576 err
= set_bitmap_file(mddev
, (int)arg
);
6586 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6588 mddev
->hold_active
= 0;
6589 mddev_unlock(mddev
);
6598 #ifdef CONFIG_COMPAT
6599 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6600 unsigned int cmd
, unsigned long arg
)
6603 case HOT_REMOVE_DISK
:
6605 case SET_DISK_FAULTY
:
6606 case SET_BITMAP_FILE
:
6607 /* These take in integer arg, do not convert */
6610 arg
= (unsigned long)compat_ptr(arg
);
6614 return md_ioctl(bdev
, mode
, cmd
, arg
);
6616 #endif /* CONFIG_COMPAT */
6618 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6621 * Succeed if we can lock the mddev, which confirms that
6622 * it isn't being stopped right now.
6624 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6630 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6631 /* we are racing with mddev_put which is discarding this
6635 /* Wait until bdev->bd_disk is definitely gone */
6636 flush_workqueue(md_misc_wq
);
6637 /* Then retry the open from the top */
6638 return -ERESTARTSYS
;
6640 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6642 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6646 atomic_inc(&mddev
->openers
);
6647 mutex_unlock(&mddev
->open_mutex
);
6649 check_disk_change(bdev
);
6654 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6656 struct mddev
*mddev
= disk
->private_data
;
6659 atomic_dec(&mddev
->openers
);
6665 static int md_media_changed(struct gendisk
*disk
)
6667 struct mddev
*mddev
= disk
->private_data
;
6669 return mddev
->changed
;
6672 static int md_revalidate(struct gendisk
*disk
)
6674 struct mddev
*mddev
= disk
->private_data
;
6679 static const struct block_device_operations md_fops
=
6681 .owner
= THIS_MODULE
,
6683 .release
= md_release
,
6685 #ifdef CONFIG_COMPAT
6686 .compat_ioctl
= md_compat_ioctl
,
6688 .getgeo
= md_getgeo
,
6689 .media_changed
= md_media_changed
,
6690 .revalidate_disk
= md_revalidate
,
6693 static int md_thread(void * arg
)
6695 struct md_thread
*thread
= arg
;
6698 * md_thread is a 'system-thread', it's priority should be very
6699 * high. We avoid resource deadlocks individually in each
6700 * raid personality. (RAID5 does preallocation) We also use RR and
6701 * the very same RT priority as kswapd, thus we will never get
6702 * into a priority inversion deadlock.
6704 * we definitely have to have equal or higher priority than
6705 * bdflush, otherwise bdflush will deadlock if there are too
6706 * many dirty RAID5 blocks.
6709 allow_signal(SIGKILL
);
6710 while (!kthread_should_stop()) {
6712 /* We need to wait INTERRUPTIBLE so that
6713 * we don't add to the load-average.
6714 * That means we need to be sure no signals are
6717 if (signal_pending(current
))
6718 flush_signals(current
);
6720 wait_event_interruptible_timeout
6722 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6723 || kthread_should_stop(),
6726 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6727 if (!kthread_should_stop())
6728 thread
->run(thread
);
6734 void md_wakeup_thread(struct md_thread
*thread
)
6737 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6738 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6739 wake_up(&thread
->wqueue
);
6743 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6744 struct mddev
*mddev
, const char *name
)
6746 struct md_thread
*thread
;
6748 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6752 init_waitqueue_head(&thread
->wqueue
);
6755 thread
->mddev
= mddev
;
6756 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6757 thread
->tsk
= kthread_run(md_thread
, thread
,
6759 mdname(thread
->mddev
),
6761 if (IS_ERR(thread
->tsk
)) {
6768 void md_unregister_thread(struct md_thread
**threadp
)
6770 struct md_thread
*thread
= *threadp
;
6773 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6774 /* Locking ensures that mddev_unlock does not wake_up a
6775 * non-existent thread
6777 spin_lock(&pers_lock
);
6779 spin_unlock(&pers_lock
);
6781 kthread_stop(thread
->tsk
);
6785 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6792 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6795 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6797 mddev
->pers
->error_handler(mddev
,rdev
);
6798 if (mddev
->degraded
)
6799 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6800 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6801 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6802 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6803 md_wakeup_thread(mddev
->thread
);
6804 if (mddev
->event_work
.func
)
6805 queue_work(md_misc_wq
, &mddev
->event_work
);
6806 md_new_event_inintr(mddev
);
6809 /* seq_file implementation /proc/mdstat */
6811 static void status_unused(struct seq_file
*seq
)
6814 struct md_rdev
*rdev
;
6816 seq_printf(seq
, "unused devices: ");
6818 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6819 char b
[BDEVNAME_SIZE
];
6821 seq_printf(seq
, "%s ",
6822 bdevname(rdev
->bdev
,b
));
6825 seq_printf(seq
, "<none>");
6827 seq_printf(seq
, "\n");
6831 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6833 sector_t max_sectors
, resync
, res
;
6834 unsigned long dt
, db
;
6837 unsigned int per_milli
;
6839 if (mddev
->curr_resync
<= 3)
6842 resync
= mddev
->curr_resync
6843 - atomic_read(&mddev
->recovery_active
);
6845 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6846 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6847 max_sectors
= mddev
->resync_max_sectors
;
6849 max_sectors
= mddev
->dev_sectors
;
6852 * Should not happen.
6858 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6859 * in a sector_t, and (max_sectors>>scale) will fit in a
6860 * u32, as those are the requirements for sector_div.
6861 * Thus 'scale' must be at least 10
6864 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6865 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6868 res
= (resync
>>scale
)*1000;
6869 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6873 int i
, x
= per_milli
/50, y
= 20-x
;
6874 seq_printf(seq
, "[");
6875 for (i
= 0; i
< x
; i
++)
6876 seq_printf(seq
, "=");
6877 seq_printf(seq
, ">");
6878 for (i
= 0; i
< y
; i
++)
6879 seq_printf(seq
, ".");
6880 seq_printf(seq
, "] ");
6882 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6883 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6885 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6887 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6888 "resync" : "recovery"))),
6889 per_milli
/10, per_milli
% 10,
6890 (unsigned long long) resync
/2,
6891 (unsigned long long) max_sectors
/2);
6894 * dt: time from mark until now
6895 * db: blocks written from mark until now
6896 * rt: remaining time
6898 * rt is a sector_t, so could be 32bit or 64bit.
6899 * So we divide before multiply in case it is 32bit and close
6901 * We scale the divisor (db) by 32 to avoid losing precision
6902 * near the end of resync when the number of remaining sectors
6904 * We then divide rt by 32 after multiplying by db to compensate.
6905 * The '+1' avoids division by zero if db is very small.
6907 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6909 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6910 - mddev
->resync_mark_cnt
;
6912 rt
= max_sectors
- resync
; /* number of remaining sectors */
6913 sector_div(rt
, db
/32+1);
6917 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6918 ((unsigned long)rt
% 60)/6);
6920 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6923 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6925 struct list_head
*tmp
;
6927 struct mddev
*mddev
;
6935 spin_lock(&all_mddevs_lock
);
6936 list_for_each(tmp
,&all_mddevs
)
6938 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6940 spin_unlock(&all_mddevs_lock
);
6943 spin_unlock(&all_mddevs_lock
);
6945 return (void*)2;/* tail */
6949 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6951 struct list_head
*tmp
;
6952 struct mddev
*next_mddev
, *mddev
= v
;
6958 spin_lock(&all_mddevs_lock
);
6960 tmp
= all_mddevs
.next
;
6962 tmp
= mddev
->all_mddevs
.next
;
6963 if (tmp
!= &all_mddevs
)
6964 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6966 next_mddev
= (void*)2;
6969 spin_unlock(&all_mddevs_lock
);
6977 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6979 struct mddev
*mddev
= v
;
6981 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6985 static int md_seq_show(struct seq_file
*seq
, void *v
)
6987 struct mddev
*mddev
= v
;
6989 struct md_rdev
*rdev
;
6991 if (v
== (void*)1) {
6992 struct md_personality
*pers
;
6993 seq_printf(seq
, "Personalities : ");
6994 spin_lock(&pers_lock
);
6995 list_for_each_entry(pers
, &pers_list
, list
)
6996 seq_printf(seq
, "[%s] ", pers
->name
);
6998 spin_unlock(&pers_lock
);
6999 seq_printf(seq
, "\n");
7000 seq
->poll_event
= atomic_read(&md_event_count
);
7003 if (v
== (void*)2) {
7008 if (mddev_lock(mddev
) < 0)
7011 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7012 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7013 mddev
->pers
? "" : "in");
7016 seq_printf(seq
, " (read-only)");
7018 seq_printf(seq
, " (auto-read-only)");
7019 seq_printf(seq
, " %s", mddev
->pers
->name
);
7023 rdev_for_each(rdev
, mddev
) {
7024 char b
[BDEVNAME_SIZE
];
7025 seq_printf(seq
, " %s[%d]",
7026 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7027 if (test_bit(WriteMostly
, &rdev
->flags
))
7028 seq_printf(seq
, "(W)");
7029 if (test_bit(Faulty
, &rdev
->flags
)) {
7030 seq_printf(seq
, "(F)");
7033 if (rdev
->raid_disk
< 0)
7034 seq_printf(seq
, "(S)"); /* spare */
7035 if (test_bit(Replacement
, &rdev
->flags
))
7036 seq_printf(seq
, "(R)");
7037 sectors
+= rdev
->sectors
;
7040 if (!list_empty(&mddev
->disks
)) {
7042 seq_printf(seq
, "\n %llu blocks",
7043 (unsigned long long)
7044 mddev
->array_sectors
/ 2);
7046 seq_printf(seq
, "\n %llu blocks",
7047 (unsigned long long)sectors
/ 2);
7049 if (mddev
->persistent
) {
7050 if (mddev
->major_version
!= 0 ||
7051 mddev
->minor_version
!= 90) {
7052 seq_printf(seq
," super %d.%d",
7053 mddev
->major_version
,
7054 mddev
->minor_version
);
7056 } else if (mddev
->external
)
7057 seq_printf(seq
, " super external:%s",
7058 mddev
->metadata_type
);
7060 seq_printf(seq
, " super non-persistent");
7063 mddev
->pers
->status(seq
, mddev
);
7064 seq_printf(seq
, "\n ");
7065 if (mddev
->pers
->sync_request
) {
7066 if (mddev
->curr_resync
> 2) {
7067 status_resync(seq
, mddev
);
7068 seq_printf(seq
, "\n ");
7069 } else if (mddev
->curr_resync
>= 1)
7070 seq_printf(seq
, "\tresync=DELAYED\n ");
7071 else if (mddev
->recovery_cp
< MaxSector
)
7072 seq_printf(seq
, "\tresync=PENDING\n ");
7075 seq_printf(seq
, "\n ");
7077 bitmap_status(seq
, mddev
->bitmap
);
7079 seq_printf(seq
, "\n");
7081 mddev_unlock(mddev
);
7086 static const struct seq_operations md_seq_ops
= {
7087 .start
= md_seq_start
,
7088 .next
= md_seq_next
,
7089 .stop
= md_seq_stop
,
7090 .show
= md_seq_show
,
7093 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7095 struct seq_file
*seq
;
7098 error
= seq_open(file
, &md_seq_ops
);
7102 seq
= file
->private_data
;
7103 seq
->poll_event
= atomic_read(&md_event_count
);
7107 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7109 struct seq_file
*seq
= filp
->private_data
;
7112 poll_wait(filp
, &md_event_waiters
, wait
);
7114 /* always allow read */
7115 mask
= POLLIN
| POLLRDNORM
;
7117 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7118 mask
|= POLLERR
| POLLPRI
;
7122 static const struct file_operations md_seq_fops
= {
7123 .owner
= THIS_MODULE
,
7124 .open
= md_seq_open
,
7126 .llseek
= seq_lseek
,
7127 .release
= seq_release_private
,
7128 .poll
= mdstat_poll
,
7131 int register_md_personality(struct md_personality
*p
)
7133 spin_lock(&pers_lock
);
7134 list_add_tail(&p
->list
, &pers_list
);
7135 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7136 spin_unlock(&pers_lock
);
7140 int unregister_md_personality(struct md_personality
*p
)
7142 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7143 spin_lock(&pers_lock
);
7144 list_del_init(&p
->list
);
7145 spin_unlock(&pers_lock
);
7149 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7151 struct md_rdev
* rdev
;
7157 rdev_for_each_rcu(rdev
, mddev
) {
7158 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7159 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7160 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7161 atomic_read(&disk
->sync_io
);
7162 /* sync IO will cause sync_io to increase before the disk_stats
7163 * as sync_io is counted when a request starts, and
7164 * disk_stats is counted when it completes.
7165 * So resync activity will cause curr_events to be smaller than
7166 * when there was no such activity.
7167 * non-sync IO will cause disk_stat to increase without
7168 * increasing sync_io so curr_events will (eventually)
7169 * be larger than it was before. Once it becomes
7170 * substantially larger, the test below will cause
7171 * the array to appear non-idle, and resync will slow
7173 * If there is a lot of outstanding resync activity when
7174 * we set last_event to curr_events, then all that activity
7175 * completing might cause the array to appear non-idle
7176 * and resync will be slowed down even though there might
7177 * not have been non-resync activity. This will only
7178 * happen once though. 'last_events' will soon reflect
7179 * the state where there is little or no outstanding
7180 * resync requests, and further resync activity will
7181 * always make curr_events less than last_events.
7184 if (init
|| curr_events
- rdev
->last_events
> 64) {
7185 rdev
->last_events
= curr_events
;
7193 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7195 /* another "blocks" (512byte) blocks have been synced */
7196 atomic_sub(blocks
, &mddev
->recovery_active
);
7197 wake_up(&mddev
->recovery_wait
);
7199 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7200 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7201 md_wakeup_thread(mddev
->thread
);
7202 // stop recovery, signal do_sync ....
7207 /* md_write_start(mddev, bi)
7208 * If we need to update some array metadata (e.g. 'active' flag
7209 * in superblock) before writing, schedule a superblock update
7210 * and wait for it to complete.
7212 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7215 if (bio_data_dir(bi
) != WRITE
)
7218 BUG_ON(mddev
->ro
== 1);
7219 if (mddev
->ro
== 2) {
7220 /* need to switch to read/write */
7222 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7223 md_wakeup_thread(mddev
->thread
);
7224 md_wakeup_thread(mddev
->sync_thread
);
7227 atomic_inc(&mddev
->writes_pending
);
7228 if (mddev
->safemode
== 1)
7229 mddev
->safemode
= 0;
7230 if (mddev
->in_sync
) {
7231 spin_lock_irq(&mddev
->write_lock
);
7232 if (mddev
->in_sync
) {
7234 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7235 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7236 md_wakeup_thread(mddev
->thread
);
7239 spin_unlock_irq(&mddev
->write_lock
);
7242 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7243 wait_event(mddev
->sb_wait
,
7244 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7247 void md_write_end(struct mddev
*mddev
)
7249 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7250 if (mddev
->safemode
== 2)
7251 md_wakeup_thread(mddev
->thread
);
7252 else if (mddev
->safemode_delay
)
7253 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7257 /* md_allow_write(mddev)
7258 * Calling this ensures that the array is marked 'active' so that writes
7259 * may proceed without blocking. It is important to call this before
7260 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7261 * Must be called with mddev_lock held.
7263 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7264 * is dropped, so return -EAGAIN after notifying userspace.
7266 int md_allow_write(struct mddev
*mddev
)
7272 if (!mddev
->pers
->sync_request
)
7275 spin_lock_irq(&mddev
->write_lock
);
7276 if (mddev
->in_sync
) {
7278 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7279 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7280 if (mddev
->safemode_delay
&&
7281 mddev
->safemode
== 0)
7282 mddev
->safemode
= 1;
7283 spin_unlock_irq(&mddev
->write_lock
);
7284 md_update_sb(mddev
, 0);
7285 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7287 spin_unlock_irq(&mddev
->write_lock
);
7289 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7294 EXPORT_SYMBOL_GPL(md_allow_write
);
7296 #define SYNC_MARKS 10
7297 #define SYNC_MARK_STEP (3*HZ)
7298 #define UPDATE_FREQUENCY (5*60*HZ)
7299 void md_do_sync(struct md_thread
*thread
)
7301 struct mddev
*mddev
= thread
->mddev
;
7302 struct mddev
*mddev2
;
7303 unsigned int currspeed
= 0,
7305 sector_t max_sectors
,j
, io_sectors
;
7306 unsigned long mark
[SYNC_MARKS
];
7307 unsigned long update_time
;
7308 sector_t mark_cnt
[SYNC_MARKS
];
7310 struct list_head
*tmp
;
7311 sector_t last_check
;
7313 struct md_rdev
*rdev
;
7315 struct blk_plug plug
;
7317 /* just incase thread restarts... */
7318 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7320 if (mddev
->ro
) /* never try to sync a read-only array */
7323 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7324 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
7325 desc
= "data-check";
7326 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7327 desc
= "requested-resync";
7330 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7335 /* we overload curr_resync somewhat here.
7336 * 0 == not engaged in resync at all
7337 * 2 == checking that there is no conflict with another sync
7338 * 1 == like 2, but have yielded to allow conflicting resync to
7340 * other == active in resync - this many blocks
7342 * Before starting a resync we must have set curr_resync to
7343 * 2, and then checked that every "conflicting" array has curr_resync
7344 * less than ours. When we find one that is the same or higher
7345 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7346 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7347 * This will mean we have to start checking from the beginning again.
7352 mddev
->curr_resync
= 2;
7355 if (kthread_should_stop())
7356 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7358 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7360 for_each_mddev(mddev2
, tmp
) {
7361 if (mddev2
== mddev
)
7363 if (!mddev
->parallel_resync
7364 && mddev2
->curr_resync
7365 && match_mddev_units(mddev
, mddev2
)) {
7367 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7368 /* arbitrarily yield */
7369 mddev
->curr_resync
= 1;
7370 wake_up(&resync_wait
);
7372 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7373 /* no need to wait here, we can wait the next
7374 * time 'round when curr_resync == 2
7377 /* We need to wait 'interruptible' so as not to
7378 * contribute to the load average, and not to
7379 * be caught by 'softlockup'
7381 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7382 if (!kthread_should_stop() &&
7383 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7384 printk(KERN_INFO
"md: delaying %s of %s"
7385 " until %s has finished (they"
7386 " share one or more physical units)\n",
7387 desc
, mdname(mddev
), mdname(mddev2
));
7389 if (signal_pending(current
))
7390 flush_signals(current
);
7392 finish_wait(&resync_wait
, &wq
);
7395 finish_wait(&resync_wait
, &wq
);
7398 } while (mddev
->curr_resync
< 2);
7401 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7402 /* resync follows the size requested by the personality,
7403 * which defaults to physical size, but can be virtual size
7405 max_sectors
= mddev
->resync_max_sectors
;
7406 atomic64_set(&mddev
->resync_mismatches
, 0);
7407 /* we don't use the checkpoint if there's a bitmap */
7408 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7409 j
= mddev
->resync_min
;
7410 else if (!mddev
->bitmap
)
7411 j
= mddev
->recovery_cp
;
7413 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7414 max_sectors
= mddev
->resync_max_sectors
;
7416 /* recovery follows the physical size of devices */
7417 max_sectors
= mddev
->dev_sectors
;
7420 rdev_for_each_rcu(rdev
, mddev
)
7421 if (rdev
->raid_disk
>= 0 &&
7422 !test_bit(Faulty
, &rdev
->flags
) &&
7423 !test_bit(In_sync
, &rdev
->flags
) &&
7424 rdev
->recovery_offset
< j
)
7425 j
= rdev
->recovery_offset
;
7429 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7430 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7431 " %d KB/sec/disk.\n", speed_min(mddev
));
7432 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7433 "(but not more than %d KB/sec) for %s.\n",
7434 speed_max(mddev
), desc
);
7436 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7439 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7441 mark_cnt
[m
] = io_sectors
;
7444 mddev
->resync_mark
= mark
[last_mark
];
7445 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7448 * Tune reconstruction:
7450 window
= 32*(PAGE_SIZE
/512);
7451 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7452 window
/2, (unsigned long long)max_sectors
/2);
7454 atomic_set(&mddev
->recovery_active
, 0);
7459 "md: resuming %s of %s from checkpoint.\n",
7460 desc
, mdname(mddev
));
7461 mddev
->curr_resync
= j
;
7463 mddev
->curr_resync
= 3; /* no longer delayed */
7464 mddev
->curr_resync_completed
= j
;
7465 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7466 md_new_event(mddev
);
7467 update_time
= jiffies
;
7469 blk_start_plug(&plug
);
7470 while (j
< max_sectors
) {
7475 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7476 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7477 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7478 > (max_sectors
>> 4)) ||
7479 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7480 (j
- mddev
->curr_resync_completed
)*2
7481 >= mddev
->resync_max
- mddev
->curr_resync_completed
7483 /* time to update curr_resync_completed */
7484 wait_event(mddev
->recovery_wait
,
7485 atomic_read(&mddev
->recovery_active
) == 0);
7486 mddev
->curr_resync_completed
= j
;
7487 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7488 j
> mddev
->recovery_cp
)
7489 mddev
->recovery_cp
= j
;
7490 update_time
= jiffies
;
7491 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7492 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7495 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
7496 /* As this condition is controlled by user-space,
7497 * we can block indefinitely, so use '_interruptible'
7498 * to avoid triggering warnings.
7500 flush_signals(current
); /* just in case */
7501 wait_event_interruptible(mddev
->recovery_wait
,
7502 mddev
->resync_max
> j
7503 || kthread_should_stop());
7506 if (kthread_should_stop())
7509 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7510 currspeed
< speed_min(mddev
));
7512 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7516 if (!skipped
) { /* actual IO requested */
7517 io_sectors
+= sectors
;
7518 atomic_add(sectors
, &mddev
->recovery_active
);
7521 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7526 mddev
->curr_resync
= j
;
7527 mddev
->curr_mark_cnt
= io_sectors
;
7528 if (last_check
== 0)
7529 /* this is the earliest that rebuild will be
7530 * visible in /proc/mdstat
7532 md_new_event(mddev
);
7534 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7537 last_check
= io_sectors
;
7539 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7541 int next
= (last_mark
+1) % SYNC_MARKS
;
7543 mddev
->resync_mark
= mark
[next
];
7544 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7545 mark
[next
] = jiffies
;
7546 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7551 if (kthread_should_stop())
7556 * this loop exits only if either when we are slower than
7557 * the 'hard' speed limit, or the system was IO-idle for
7559 * the system might be non-idle CPU-wise, but we only care
7560 * about not overloading the IO subsystem. (things like an
7561 * e2fsck being done on the RAID array should execute fast)
7565 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7566 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7568 if (currspeed
> speed_min(mddev
)) {
7569 if ((currspeed
> speed_max(mddev
)) ||
7570 !is_mddev_idle(mddev
, 0)) {
7576 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7578 * this also signals 'finished resyncing' to md_stop
7581 blk_finish_plug(&plug
);
7582 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7584 /* tell personality that we are finished */
7585 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7587 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7588 mddev
->curr_resync
> 2) {
7589 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7590 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7591 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7593 "md: checkpointing %s of %s.\n",
7594 desc
, mdname(mddev
));
7595 if (test_bit(MD_RECOVERY_ERROR
,
7597 mddev
->recovery_cp
=
7598 mddev
->curr_resync_completed
;
7600 mddev
->recovery_cp
=
7604 mddev
->recovery_cp
= MaxSector
;
7606 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7607 mddev
->curr_resync
= MaxSector
;
7609 rdev_for_each_rcu(rdev
, mddev
)
7610 if (rdev
->raid_disk
>= 0 &&
7611 mddev
->delta_disks
>= 0 &&
7612 !test_bit(Faulty
, &rdev
->flags
) &&
7613 !test_bit(In_sync
, &rdev
->flags
) &&
7614 rdev
->recovery_offset
< mddev
->curr_resync
)
7615 rdev
->recovery_offset
= mddev
->curr_resync
;
7620 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7622 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7623 /* We completed so min/max setting can be forgotten if used. */
7624 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7625 mddev
->resync_min
= 0;
7626 mddev
->resync_max
= MaxSector
;
7627 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7628 mddev
->resync_min
= mddev
->curr_resync_completed
;
7629 mddev
->curr_resync
= 0;
7630 wake_up(&resync_wait
);
7631 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7632 md_wakeup_thread(mddev
->thread
);
7637 * got a signal, exit.
7640 "md: md_do_sync() got signal ... exiting\n");
7641 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7645 EXPORT_SYMBOL_GPL(md_do_sync
);
7647 static int remove_and_add_spares(struct mddev
*mddev
)
7649 struct md_rdev
*rdev
;
7653 rdev_for_each(rdev
, mddev
)
7654 if (rdev
->raid_disk
>= 0 &&
7655 !test_bit(Blocked
, &rdev
->flags
) &&
7656 (test_bit(Faulty
, &rdev
->flags
) ||
7657 ! test_bit(In_sync
, &rdev
->flags
)) &&
7658 atomic_read(&rdev
->nr_pending
)==0) {
7659 if (mddev
->pers
->hot_remove_disk(
7660 mddev
, rdev
) == 0) {
7661 sysfs_unlink_rdev(mddev
, rdev
);
7662 rdev
->raid_disk
= -1;
7666 if (removed
&& mddev
->kobj
.sd
)
7667 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7669 rdev_for_each(rdev
, mddev
) {
7670 if (rdev
->raid_disk
>= 0 &&
7671 !test_bit(In_sync
, &rdev
->flags
) &&
7672 !test_bit(Faulty
, &rdev
->flags
))
7674 if (rdev
->raid_disk
< 0
7675 && !test_bit(Faulty
, &rdev
->flags
)) {
7676 rdev
->recovery_offset
= 0;
7678 hot_add_disk(mddev
, rdev
) == 0) {
7679 if (sysfs_link_rdev(mddev
, rdev
))
7680 /* failure here is OK */;
7682 md_new_event(mddev
);
7683 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7688 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7692 static void reap_sync_thread(struct mddev
*mddev
)
7694 struct md_rdev
*rdev
;
7696 /* resync has finished, collect result */
7697 md_unregister_thread(&mddev
->sync_thread
);
7698 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7699 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7701 /* activate any spares */
7702 if (mddev
->pers
->spare_active(mddev
)) {
7703 sysfs_notify(&mddev
->kobj
, NULL
,
7705 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7708 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7709 mddev
->pers
->finish_reshape
)
7710 mddev
->pers
->finish_reshape(mddev
);
7712 /* If array is no-longer degraded, then any saved_raid_disk
7713 * information must be scrapped. Also if any device is now
7714 * In_sync we must scrape the saved_raid_disk for that device
7715 * do the superblock for an incrementally recovered device
7718 rdev_for_each(rdev
, mddev
)
7719 if (!mddev
->degraded
||
7720 test_bit(In_sync
, &rdev
->flags
))
7721 rdev
->saved_raid_disk
= -1;
7723 md_update_sb(mddev
, 1);
7724 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7725 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7726 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7727 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7728 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7729 /* flag recovery needed just to double check */
7730 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7731 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7732 md_new_event(mddev
);
7733 if (mddev
->event_work
.func
)
7734 queue_work(md_misc_wq
, &mddev
->event_work
);
7738 * This routine is regularly called by all per-raid-array threads to
7739 * deal with generic issues like resync and super-block update.
7740 * Raid personalities that don't have a thread (linear/raid0) do not
7741 * need this as they never do any recovery or update the superblock.
7743 * It does not do any resync itself, but rather "forks" off other threads
7744 * to do that as needed.
7745 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7746 * "->recovery" and create a thread at ->sync_thread.
7747 * When the thread finishes it sets MD_RECOVERY_DONE
7748 * and wakeups up this thread which will reap the thread and finish up.
7749 * This thread also removes any faulty devices (with nr_pending == 0).
7751 * The overall approach is:
7752 * 1/ if the superblock needs updating, update it.
7753 * 2/ If a recovery thread is running, don't do anything else.
7754 * 3/ If recovery has finished, clean up, possibly marking spares active.
7755 * 4/ If there are any faulty devices, remove them.
7756 * 5/ If array is degraded, try to add spares devices
7757 * 6/ If array has spares or is not in-sync, start a resync thread.
7759 void md_check_recovery(struct mddev
*mddev
)
7761 if (mddev
->suspended
)
7765 bitmap_daemon_work(mddev
);
7767 if (signal_pending(current
)) {
7768 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7769 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7771 mddev
->safemode
= 2;
7773 flush_signals(current
);
7776 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7779 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7780 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7781 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7782 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7783 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7784 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7788 if (mddev_trylock(mddev
)) {
7792 /* Only thing we do on a ro array is remove
7795 struct md_rdev
*rdev
;
7796 rdev_for_each(rdev
, mddev
)
7797 if (rdev
->raid_disk
>= 0 &&
7798 !test_bit(Blocked
, &rdev
->flags
) &&
7799 test_bit(Faulty
, &rdev
->flags
) &&
7800 atomic_read(&rdev
->nr_pending
)==0) {
7801 if (mddev
->pers
->hot_remove_disk(
7802 mddev
, rdev
) == 0) {
7803 sysfs_unlink_rdev(mddev
, rdev
);
7804 rdev
->raid_disk
= -1;
7807 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7811 if (!mddev
->external
) {
7813 spin_lock_irq(&mddev
->write_lock
);
7814 if (mddev
->safemode
&&
7815 !atomic_read(&mddev
->writes_pending
) &&
7817 mddev
->recovery_cp
== MaxSector
) {
7820 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7822 if (mddev
->safemode
== 1)
7823 mddev
->safemode
= 0;
7824 spin_unlock_irq(&mddev
->write_lock
);
7826 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7830 md_update_sb(mddev
, 0);
7832 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7833 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7834 /* resync/recovery still happening */
7835 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7838 if (mddev
->sync_thread
) {
7839 reap_sync_thread(mddev
);
7842 /* Set RUNNING before clearing NEEDED to avoid
7843 * any transients in the value of "sync_action".
7845 mddev
->curr_resync_completed
= 0;
7846 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7847 /* Clear some bits that don't mean anything, but
7850 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7851 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7853 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7854 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7856 /* no recovery is running.
7857 * remove any failed drives, then
7858 * add spares if possible.
7859 * Spares are also removed and re-added, to allow
7860 * the personality to fail the re-add.
7863 if (mddev
->reshape_position
!= MaxSector
) {
7864 if (mddev
->pers
->check_reshape
== NULL
||
7865 mddev
->pers
->check_reshape(mddev
) != 0)
7866 /* Cannot proceed */
7868 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7869 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7870 } else if ((spares
= remove_and_add_spares(mddev
))) {
7871 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7872 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7873 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7874 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7875 } else if (mddev
->recovery_cp
< MaxSector
) {
7876 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7877 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7878 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7879 /* nothing to be done ... */
7882 if (mddev
->pers
->sync_request
) {
7884 /* We are adding a device or devices to an array
7885 * which has the bitmap stored on all devices.
7886 * So make sure all bitmap pages get written
7888 bitmap_write_all(mddev
->bitmap
);
7890 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7893 if (!mddev
->sync_thread
) {
7894 printk(KERN_ERR
"%s: could not start resync"
7897 /* leave the spares where they are, it shouldn't hurt */
7898 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7899 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7900 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7901 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7902 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7904 md_wakeup_thread(mddev
->sync_thread
);
7905 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7906 md_new_event(mddev
);
7909 if (!mddev
->sync_thread
) {
7910 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7911 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7913 if (mddev
->sysfs_action
)
7914 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7916 mddev_unlock(mddev
);
7920 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7922 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7923 wait_event_timeout(rdev
->blocked_wait
,
7924 !test_bit(Blocked
, &rdev
->flags
) &&
7925 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7926 msecs_to_jiffies(5000));
7927 rdev_dec_pending(rdev
, mddev
);
7929 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7931 void md_finish_reshape(struct mddev
*mddev
)
7933 /* called be personality module when reshape completes. */
7934 struct md_rdev
*rdev
;
7936 rdev_for_each(rdev
, mddev
) {
7937 if (rdev
->data_offset
> rdev
->new_data_offset
)
7938 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7940 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7941 rdev
->data_offset
= rdev
->new_data_offset
;
7944 EXPORT_SYMBOL(md_finish_reshape
);
7946 /* Bad block management.
7947 * We can record which blocks on each device are 'bad' and so just
7948 * fail those blocks, or that stripe, rather than the whole device.
7949 * Entries in the bad-block table are 64bits wide. This comprises:
7950 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7951 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7952 * A 'shift' can be set so that larger blocks are tracked and
7953 * consequently larger devices can be covered.
7954 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7956 * Locking of the bad-block table uses a seqlock so md_is_badblock
7957 * might need to retry if it is very unlucky.
7958 * We will sometimes want to check for bad blocks in a bi_end_io function,
7959 * so we use the write_seqlock_irq variant.
7961 * When looking for a bad block we specify a range and want to
7962 * know if any block in the range is bad. So we binary-search
7963 * to the last range that starts at-or-before the given endpoint,
7964 * (or "before the sector after the target range")
7965 * then see if it ends after the given start.
7967 * 0 if there are no known bad blocks in the range
7968 * 1 if there are known bad block which are all acknowledged
7969 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7970 * plus the start/length of the first bad section we overlap.
7972 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7973 sector_t
*first_bad
, int *bad_sectors
)
7979 sector_t target
= s
+ sectors
;
7982 if (bb
->shift
> 0) {
7983 /* round the start down, and the end up */
7985 target
+= (1<<bb
->shift
) - 1;
7986 target
>>= bb
->shift
;
7987 sectors
= target
- s
;
7989 /* 'target' is now the first block after the bad range */
7992 seq
= read_seqbegin(&bb
->lock
);
7997 /* Binary search between lo and hi for 'target'
7998 * i.e. for the last range that starts before 'target'
8000 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8001 * are known not to be the last range before target.
8002 * VARIANT: hi-lo is the number of possible
8003 * ranges, and decreases until it reaches 1
8005 while (hi
- lo
> 1) {
8006 int mid
= (lo
+ hi
) / 2;
8007 sector_t a
= BB_OFFSET(p
[mid
]);
8009 /* This could still be the one, earlier ranges
8013 /* This and later ranges are definitely out. */
8016 /* 'lo' might be the last that started before target, but 'hi' isn't */
8018 /* need to check all range that end after 's' to see if
8019 * any are unacknowledged.
8022 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8023 if (BB_OFFSET(p
[lo
]) < target
) {
8024 /* starts before the end, and finishes after
8025 * the start, so they must overlap
8027 if (rv
!= -1 && BB_ACK(p
[lo
]))
8031 *first_bad
= BB_OFFSET(p
[lo
]);
8032 *bad_sectors
= BB_LEN(p
[lo
]);
8038 if (read_seqretry(&bb
->lock
, seq
))
8043 EXPORT_SYMBOL_GPL(md_is_badblock
);
8046 * Add a range of bad blocks to the table.
8047 * This might extend the table, or might contract it
8048 * if two adjacent ranges can be merged.
8049 * We binary-search to find the 'insertion' point, then
8050 * decide how best to handle it.
8052 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8060 /* badblocks are disabled */
8064 /* round the start down, and the end up */
8065 sector_t next
= s
+ sectors
;
8067 next
+= (1<<bb
->shift
) - 1;
8072 write_seqlock_irq(&bb
->lock
);
8077 /* Find the last range that starts at-or-before 's' */
8078 while (hi
- lo
> 1) {
8079 int mid
= (lo
+ hi
) / 2;
8080 sector_t a
= BB_OFFSET(p
[mid
]);
8086 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8090 /* we found a range that might merge with the start
8093 sector_t a
= BB_OFFSET(p
[lo
]);
8094 sector_t e
= a
+ BB_LEN(p
[lo
]);
8095 int ack
= BB_ACK(p
[lo
]);
8097 /* Yes, we can merge with a previous range */
8098 if (s
== a
&& s
+ sectors
>= e
)
8099 /* new range covers old */
8102 ack
= ack
&& acknowledged
;
8104 if (e
< s
+ sectors
)
8106 if (e
- a
<= BB_MAX_LEN
) {
8107 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8110 /* does not all fit in one range,
8111 * make p[lo] maximal
8113 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8114 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8120 if (sectors
&& hi
< bb
->count
) {
8121 /* 'hi' points to the first range that starts after 's'.
8122 * Maybe we can merge with the start of that range */
8123 sector_t a
= BB_OFFSET(p
[hi
]);
8124 sector_t e
= a
+ BB_LEN(p
[hi
]);
8125 int ack
= BB_ACK(p
[hi
]);
8126 if (a
<= s
+ sectors
) {
8127 /* merging is possible */
8128 if (e
<= s
+ sectors
) {
8133 ack
= ack
&& acknowledged
;
8136 if (e
- a
<= BB_MAX_LEN
) {
8137 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8140 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8148 if (sectors
== 0 && hi
< bb
->count
) {
8149 /* we might be able to combine lo and hi */
8150 /* Note: 's' is at the end of 'lo' */
8151 sector_t a
= BB_OFFSET(p
[hi
]);
8152 int lolen
= BB_LEN(p
[lo
]);
8153 int hilen
= BB_LEN(p
[hi
]);
8154 int newlen
= lolen
+ hilen
- (s
- a
);
8155 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8156 /* yes, we can combine them */
8157 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8158 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8159 memmove(p
+ hi
, p
+ hi
+ 1,
8160 (bb
->count
- hi
- 1) * 8);
8165 /* didn't merge (it all).
8166 * Need to add a range just before 'hi' */
8167 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8168 /* No room for more */
8172 int this_sectors
= sectors
;
8173 memmove(p
+ hi
+ 1, p
+ hi
,
8174 (bb
->count
- hi
) * 8);
8177 if (this_sectors
> BB_MAX_LEN
)
8178 this_sectors
= BB_MAX_LEN
;
8179 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8180 sectors
-= this_sectors
;
8187 bb
->unacked_exist
= 1;
8188 write_sequnlock_irq(&bb
->lock
);
8193 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8198 s
+= rdev
->new_data_offset
;
8200 s
+= rdev
->data_offset
;
8201 rv
= md_set_badblocks(&rdev
->badblocks
,
8204 /* Make sure they get written out promptly */
8205 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8206 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8207 md_wakeup_thread(rdev
->mddev
->thread
);
8211 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8214 * Remove a range of bad blocks from the table.
8215 * This may involve extending the table if we spilt a region,
8216 * but it must not fail. So if the table becomes full, we just
8217 * drop the remove request.
8219 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8223 sector_t target
= s
+ sectors
;
8226 if (bb
->shift
> 0) {
8227 /* When clearing we round the start up and the end down.
8228 * This should not matter as the shift should align with
8229 * the block size and no rounding should ever be needed.
8230 * However it is better the think a block is bad when it
8231 * isn't than to think a block is not bad when it is.
8233 s
+= (1<<bb
->shift
) - 1;
8235 target
>>= bb
->shift
;
8236 sectors
= target
- s
;
8239 write_seqlock_irq(&bb
->lock
);
8244 /* Find the last range that starts before 'target' */
8245 while (hi
- lo
> 1) {
8246 int mid
= (lo
+ hi
) / 2;
8247 sector_t a
= BB_OFFSET(p
[mid
]);
8254 /* p[lo] is the last range that could overlap the
8255 * current range. Earlier ranges could also overlap,
8256 * but only this one can overlap the end of the range.
8258 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8259 /* Partial overlap, leave the tail of this range */
8260 int ack
= BB_ACK(p
[lo
]);
8261 sector_t a
= BB_OFFSET(p
[lo
]);
8262 sector_t end
= a
+ BB_LEN(p
[lo
]);
8265 /* we need to split this range */
8266 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8270 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8272 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8275 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8276 /* there is no longer an overlap */
8281 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8282 /* This range does overlap */
8283 if (BB_OFFSET(p
[lo
]) < s
) {
8284 /* Keep the early parts of this range. */
8285 int ack
= BB_ACK(p
[lo
]);
8286 sector_t start
= BB_OFFSET(p
[lo
]);
8287 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8288 /* now low doesn't overlap, so.. */
8293 /* 'lo' is strictly before, 'hi' is strictly after,
8294 * anything between needs to be discarded
8297 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8298 bb
->count
-= (hi
- lo
- 1);
8304 write_sequnlock_irq(&bb
->lock
);
8308 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8312 s
+= rdev
->new_data_offset
;
8314 s
+= rdev
->data_offset
;
8315 return md_clear_badblocks(&rdev
->badblocks
,
8318 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8321 * Acknowledge all bad blocks in a list.
8322 * This only succeeds if ->changed is clear. It is used by
8323 * in-kernel metadata updates
8325 void md_ack_all_badblocks(struct badblocks
*bb
)
8327 if (bb
->page
== NULL
|| bb
->changed
)
8328 /* no point even trying */
8330 write_seqlock_irq(&bb
->lock
);
8332 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8335 for (i
= 0; i
< bb
->count
; i
++) {
8336 if (!BB_ACK(p
[i
])) {
8337 sector_t start
= BB_OFFSET(p
[i
]);
8338 int len
= BB_LEN(p
[i
]);
8339 p
[i
] = BB_MAKE(start
, len
, 1);
8342 bb
->unacked_exist
= 0;
8344 write_sequnlock_irq(&bb
->lock
);
8346 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8348 /* sysfs access to bad-blocks list.
8349 * We present two files.
8350 * 'bad-blocks' lists sector numbers and lengths of ranges that
8351 * are recorded as bad. The list is truncated to fit within
8352 * the one-page limit of sysfs.
8353 * Writing "sector length" to this file adds an acknowledged
8355 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8356 * been acknowledged. Writing to this file adds bad blocks
8357 * without acknowledging them. This is largely for testing.
8361 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8372 seq
= read_seqbegin(&bb
->lock
);
8377 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8378 sector_t s
= BB_OFFSET(p
[i
]);
8379 unsigned int length
= BB_LEN(p
[i
]);
8380 int ack
= BB_ACK(p
[i
]);
8386 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8387 (unsigned long long)s
<< bb
->shift
,
8388 length
<< bb
->shift
);
8390 if (unack
&& len
== 0)
8391 bb
->unacked_exist
= 0;
8393 if (read_seqretry(&bb
->lock
, seq
))
8402 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8404 unsigned long long sector
;
8408 /* Allow clearing via sysfs *only* for testing/debugging.
8409 * Normally only a successful write may clear a badblock
8412 if (page
[0] == '-') {
8416 #endif /* DO_DEBUG */
8418 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8420 if (newline
!= '\n')
8432 md_clear_badblocks(bb
, sector
, length
);
8435 #endif /* DO_DEBUG */
8436 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8442 static int md_notify_reboot(struct notifier_block
*this,
8443 unsigned long code
, void *x
)
8445 struct list_head
*tmp
;
8446 struct mddev
*mddev
;
8449 for_each_mddev(mddev
, tmp
) {
8450 if (mddev_trylock(mddev
)) {
8452 __md_stop_writes(mddev
);
8453 mddev
->safemode
= 2;
8454 mddev_unlock(mddev
);
8459 * certain more exotic SCSI devices are known to be
8460 * volatile wrt too early system reboots. While the
8461 * right place to handle this issue is the given
8462 * driver, we do want to have a safe RAID driver ...
8470 static struct notifier_block md_notifier
= {
8471 .notifier_call
= md_notify_reboot
,
8473 .priority
= INT_MAX
, /* before any real devices */
8476 static void md_geninit(void)
8478 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8480 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8483 static int __init
md_init(void)
8487 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8491 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8495 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8498 if ((ret
= register_blkdev(0, "mdp")) < 0)
8502 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8503 md_probe
, NULL
, NULL
);
8504 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8505 md_probe
, NULL
, NULL
);
8507 register_reboot_notifier(&md_notifier
);
8508 raid_table_header
= register_sysctl_table(raid_root_table
);
8514 unregister_blkdev(MD_MAJOR
, "md");
8516 destroy_workqueue(md_misc_wq
);
8518 destroy_workqueue(md_wq
);
8526 * Searches all registered partitions for autorun RAID arrays
8530 static LIST_HEAD(all_detected_devices
);
8531 struct detected_devices_node
{
8532 struct list_head list
;
8536 void md_autodetect_dev(dev_t dev
)
8538 struct detected_devices_node
*node_detected_dev
;
8540 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8541 if (node_detected_dev
) {
8542 node_detected_dev
->dev
= dev
;
8543 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8545 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8546 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8551 static void autostart_arrays(int part
)
8553 struct md_rdev
*rdev
;
8554 struct detected_devices_node
*node_detected_dev
;
8556 int i_scanned
, i_passed
;
8561 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8563 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8565 node_detected_dev
= list_entry(all_detected_devices
.next
,
8566 struct detected_devices_node
, list
);
8567 list_del(&node_detected_dev
->list
);
8568 dev
= node_detected_dev
->dev
;
8569 kfree(node_detected_dev
);
8570 rdev
= md_import_device(dev
,0, 90);
8574 if (test_bit(Faulty
, &rdev
->flags
)) {
8578 set_bit(AutoDetected
, &rdev
->flags
);
8579 list_add(&rdev
->same_set
, &pending_raid_disks
);
8583 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8584 i_scanned
, i_passed
);
8586 autorun_devices(part
);
8589 #endif /* !MODULE */
8591 static __exit
void md_exit(void)
8593 struct mddev
*mddev
;
8594 struct list_head
*tmp
;
8596 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8597 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8599 unregister_blkdev(MD_MAJOR
,"md");
8600 unregister_blkdev(mdp_major
, "mdp");
8601 unregister_reboot_notifier(&md_notifier
);
8602 unregister_sysctl_table(raid_table_header
);
8603 remove_proc_entry("mdstat", NULL
);
8604 for_each_mddev(mddev
, tmp
) {
8605 export_array(mddev
);
8606 mddev
->hold_active
= 0;
8608 destroy_workqueue(md_misc_wq
);
8609 destroy_workqueue(md_wq
);
8612 subsys_initcall(md_init
);
8613 module_exit(md_exit
)
8615 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8617 return sprintf(buffer
, "%d", start_readonly
);
8619 static int set_ro(const char *val
, struct kernel_param
*kp
)
8622 int num
= simple_strtoul(val
, &e
, 10);
8623 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8624 start_readonly
= num
;
8630 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8631 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8633 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8635 EXPORT_SYMBOL(register_md_personality
);
8636 EXPORT_SYMBOL(unregister_md_personality
);
8637 EXPORT_SYMBOL(md_error
);
8638 EXPORT_SYMBOL(md_done_sync
);
8639 EXPORT_SYMBOL(md_write_start
);
8640 EXPORT_SYMBOL(md_write_end
);
8641 EXPORT_SYMBOL(md_register_thread
);
8642 EXPORT_SYMBOL(md_unregister_thread
);
8643 EXPORT_SYMBOL(md_wakeup_thread
);
8644 EXPORT_SYMBOL(md_check_recovery
);
8645 MODULE_LICENSE("GPL");
8646 MODULE_DESCRIPTION("MD RAID framework");
8648 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);