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 smp_rmb(); /* Ensure implications of 'active' are visible */
312 if (mddev
->suspended
) {
315 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
316 TASK_UNINTERRUPTIBLE
);
317 if (!mddev
->suspended
)
323 finish_wait(&mddev
->sb_wait
, &__wait
);
325 atomic_inc(&mddev
->active_io
);
329 * save the sectors now since our bio can
330 * go away inside make_request
332 sectors
= bio_sectors(bio
);
333 mddev
->pers
->make_request(mddev
, bio
);
335 cpu
= part_stat_lock();
336 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
337 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
340 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
341 wake_up(&mddev
->sb_wait
);
344 /* mddev_suspend makes sure no new requests are submitted
345 * to the device, and that any requests that have been submitted
346 * are completely handled.
347 * Once ->stop is called and completes, the module will be completely
350 void mddev_suspend(struct mddev
*mddev
)
352 BUG_ON(mddev
->suspended
);
353 mddev
->suspended
= 1;
355 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
356 mddev
->pers
->quiesce(mddev
, 1);
358 del_timer_sync(&mddev
->safemode_timer
);
360 EXPORT_SYMBOL_GPL(mddev_suspend
);
362 void mddev_resume(struct mddev
*mddev
)
364 mddev
->suspended
= 0;
365 wake_up(&mddev
->sb_wait
);
366 mddev
->pers
->quiesce(mddev
, 0);
368 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
369 md_wakeup_thread(mddev
->thread
);
370 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
372 EXPORT_SYMBOL_GPL(mddev_resume
);
374 int mddev_congested(struct mddev
*mddev
, int bits
)
376 return mddev
->suspended
;
378 EXPORT_SYMBOL(mddev_congested
);
381 * Generic flush handling for md
384 static void md_end_flush(struct bio
*bio
, int err
)
386 struct md_rdev
*rdev
= bio
->bi_private
;
387 struct mddev
*mddev
= rdev
->mddev
;
389 rdev_dec_pending(rdev
, mddev
);
391 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
392 /* The pre-request flush has finished */
393 queue_work(md_wq
, &mddev
->flush_work
);
398 static void md_submit_flush_data(struct work_struct
*ws
);
400 static void submit_flushes(struct work_struct
*ws
)
402 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
403 struct md_rdev
*rdev
;
405 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
406 atomic_set(&mddev
->flush_pending
, 1);
408 rdev_for_each_rcu(rdev
, mddev
)
409 if (rdev
->raid_disk
>= 0 &&
410 !test_bit(Faulty
, &rdev
->flags
)) {
411 /* Take two references, one is dropped
412 * when request finishes, one after
413 * we reclaim rcu_read_lock
416 atomic_inc(&rdev
->nr_pending
);
417 atomic_inc(&rdev
->nr_pending
);
419 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
420 bi
->bi_end_io
= md_end_flush
;
421 bi
->bi_private
= rdev
;
422 bi
->bi_bdev
= rdev
->bdev
;
423 atomic_inc(&mddev
->flush_pending
);
424 submit_bio(WRITE_FLUSH
, bi
);
426 rdev_dec_pending(rdev
, mddev
);
429 if (atomic_dec_and_test(&mddev
->flush_pending
))
430 queue_work(md_wq
, &mddev
->flush_work
);
433 static void md_submit_flush_data(struct work_struct
*ws
)
435 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
436 struct bio
*bio
= mddev
->flush_bio
;
438 if (bio
->bi_size
== 0)
439 /* an empty barrier - all done */
442 bio
->bi_rw
&= ~REQ_FLUSH
;
443 mddev
->pers
->make_request(mddev
, bio
);
446 mddev
->flush_bio
= NULL
;
447 wake_up(&mddev
->sb_wait
);
450 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
452 spin_lock_irq(&mddev
->write_lock
);
453 wait_event_lock_irq(mddev
->sb_wait
,
455 mddev
->write_lock
, /*nothing*/);
456 mddev
->flush_bio
= bio
;
457 spin_unlock_irq(&mddev
->write_lock
);
459 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
460 queue_work(md_wq
, &mddev
->flush_work
);
462 EXPORT_SYMBOL(md_flush_request
);
464 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
466 struct mddev
*mddev
= cb
->data
;
467 md_wakeup_thread(mddev
->thread
);
470 EXPORT_SYMBOL(md_unplug
);
472 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
474 atomic_inc(&mddev
->active
);
478 static void mddev_delayed_delete(struct work_struct
*ws
);
480 static void mddev_put(struct mddev
*mddev
)
482 struct bio_set
*bs
= NULL
;
484 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
486 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
487 mddev
->ctime
== 0 && !mddev
->hold_active
) {
488 /* Array is not configured at all, and not held active,
490 list_del_init(&mddev
->all_mddevs
);
492 mddev
->bio_set
= NULL
;
493 if (mddev
->gendisk
) {
494 /* We did a probe so need to clean up. Call
495 * queue_work inside the spinlock so that
496 * flush_workqueue() after mddev_find will
497 * succeed in waiting for the work to be done.
499 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
500 queue_work(md_misc_wq
, &mddev
->del_work
);
504 spin_unlock(&all_mddevs_lock
);
509 void mddev_init(struct mddev
*mddev
)
511 mutex_init(&mddev
->open_mutex
);
512 mutex_init(&mddev
->reconfig_mutex
);
513 mutex_init(&mddev
->bitmap_info
.mutex
);
514 INIT_LIST_HEAD(&mddev
->disks
);
515 INIT_LIST_HEAD(&mddev
->all_mddevs
);
516 init_timer(&mddev
->safemode_timer
);
517 atomic_set(&mddev
->active
, 1);
518 atomic_set(&mddev
->openers
, 0);
519 atomic_set(&mddev
->active_io
, 0);
520 spin_lock_init(&mddev
->write_lock
);
521 atomic_set(&mddev
->flush_pending
, 0);
522 init_waitqueue_head(&mddev
->sb_wait
);
523 init_waitqueue_head(&mddev
->recovery_wait
);
524 mddev
->reshape_position
= MaxSector
;
525 mddev
->reshape_backwards
= 0;
526 mddev
->resync_min
= 0;
527 mddev
->resync_max
= MaxSector
;
528 mddev
->level
= LEVEL_NONE
;
530 EXPORT_SYMBOL_GPL(mddev_init
);
532 static struct mddev
* mddev_find(dev_t unit
)
534 struct mddev
*mddev
, *new = NULL
;
536 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
537 unit
&= ~((1<<MdpMinorShift
)-1);
540 spin_lock(&all_mddevs_lock
);
543 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
544 if (mddev
->unit
== unit
) {
546 spin_unlock(&all_mddevs_lock
);
552 list_add(&new->all_mddevs
, &all_mddevs
);
553 spin_unlock(&all_mddevs_lock
);
554 new->hold_active
= UNTIL_IOCTL
;
558 /* find an unused unit number */
559 static int next_minor
= 512;
560 int start
= next_minor
;
564 dev
= MKDEV(MD_MAJOR
, next_minor
);
566 if (next_minor
> MINORMASK
)
568 if (next_minor
== start
) {
569 /* Oh dear, all in use. */
570 spin_unlock(&all_mddevs_lock
);
576 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
577 if (mddev
->unit
== dev
) {
583 new->md_minor
= MINOR(dev
);
584 new->hold_active
= UNTIL_STOP
;
585 list_add(&new->all_mddevs
, &all_mddevs
);
586 spin_unlock(&all_mddevs_lock
);
589 spin_unlock(&all_mddevs_lock
);
591 new = kzalloc(sizeof(*new), GFP_KERNEL
);
596 if (MAJOR(unit
) == MD_MAJOR
)
597 new->md_minor
= MINOR(unit
);
599 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
606 static inline int mddev_lock(struct mddev
* mddev
)
608 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
611 static inline int mddev_is_locked(struct mddev
*mddev
)
613 return mutex_is_locked(&mddev
->reconfig_mutex
);
616 static inline int mddev_trylock(struct mddev
* mddev
)
618 return mutex_trylock(&mddev
->reconfig_mutex
);
621 static struct attribute_group md_redundancy_group
;
623 static void mddev_unlock(struct mddev
* mddev
)
625 if (mddev
->to_remove
) {
626 /* These cannot be removed under reconfig_mutex as
627 * an access to the files will try to take reconfig_mutex
628 * while holding the file unremovable, which leads to
630 * So hold set sysfs_active while the remove in happeing,
631 * and anything else which might set ->to_remove or my
632 * otherwise change the sysfs namespace will fail with
633 * -EBUSY if sysfs_active is still set.
634 * We set sysfs_active under reconfig_mutex and elsewhere
635 * test it under the same mutex to ensure its correct value
638 struct attribute_group
*to_remove
= mddev
->to_remove
;
639 mddev
->to_remove
= NULL
;
640 mddev
->sysfs_active
= 1;
641 mutex_unlock(&mddev
->reconfig_mutex
);
643 if (mddev
->kobj
.sd
) {
644 if (to_remove
!= &md_redundancy_group
)
645 sysfs_remove_group(&mddev
->kobj
, to_remove
);
646 if (mddev
->pers
== NULL
||
647 mddev
->pers
->sync_request
== NULL
) {
648 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
649 if (mddev
->sysfs_action
)
650 sysfs_put(mddev
->sysfs_action
);
651 mddev
->sysfs_action
= NULL
;
654 mddev
->sysfs_active
= 0;
656 mutex_unlock(&mddev
->reconfig_mutex
);
658 /* As we've dropped the mutex we need a spinlock to
659 * make sure the thread doesn't disappear
661 spin_lock(&pers_lock
);
662 md_wakeup_thread(mddev
->thread
);
663 spin_unlock(&pers_lock
);
666 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
668 struct md_rdev
*rdev
;
670 rdev_for_each(rdev
, mddev
)
671 if (rdev
->desc_nr
== nr
)
677 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
679 struct md_rdev
*rdev
;
681 rdev_for_each_rcu(rdev
, mddev
)
682 if (rdev
->desc_nr
== nr
)
688 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
690 struct md_rdev
*rdev
;
692 rdev_for_each(rdev
, mddev
)
693 if (rdev
->bdev
->bd_dev
== dev
)
699 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
701 struct md_rdev
*rdev
;
703 rdev_for_each_rcu(rdev
, mddev
)
704 if (rdev
->bdev
->bd_dev
== dev
)
710 static struct md_personality
*find_pers(int level
, char *clevel
)
712 struct md_personality
*pers
;
713 list_for_each_entry(pers
, &pers_list
, list
) {
714 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
716 if (strcmp(pers
->name
, clevel
)==0)
722 /* return the offset of the super block in 512byte sectors */
723 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
725 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
726 return MD_NEW_SIZE_SECTORS(num_sectors
);
729 static int alloc_disk_sb(struct md_rdev
* rdev
)
734 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
735 if (!rdev
->sb_page
) {
736 printk(KERN_ALERT
"md: out of memory.\n");
743 void md_rdev_clear(struct md_rdev
*rdev
)
746 put_page(rdev
->sb_page
);
748 rdev
->sb_page
= NULL
;
753 put_page(rdev
->bb_page
);
754 rdev
->bb_page
= NULL
;
756 kfree(rdev
->badblocks
.page
);
757 rdev
->badblocks
.page
= NULL
;
759 EXPORT_SYMBOL_GPL(md_rdev_clear
);
761 static void super_written(struct bio
*bio
, int error
)
763 struct md_rdev
*rdev
= bio
->bi_private
;
764 struct mddev
*mddev
= rdev
->mddev
;
766 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
767 printk("md: super_written gets error=%d, uptodate=%d\n",
768 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
769 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
770 md_error(mddev
, rdev
);
773 if (atomic_dec_and_test(&mddev
->pending_writes
))
774 wake_up(&mddev
->sb_wait
);
778 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
779 sector_t sector
, int size
, struct page
*page
)
781 /* write first size bytes of page to sector of rdev
782 * Increment mddev->pending_writes before returning
783 * and decrement it on completion, waking up sb_wait
784 * if zero is reached.
785 * If an error occurred, call md_error
787 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
789 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
790 bio
->bi_sector
= sector
;
791 bio_add_page(bio
, page
, size
, 0);
792 bio
->bi_private
= rdev
;
793 bio
->bi_end_io
= super_written
;
795 atomic_inc(&mddev
->pending_writes
);
796 submit_bio(WRITE_FLUSH_FUA
, bio
);
799 void md_super_wait(struct mddev
*mddev
)
801 /* wait for all superblock writes that were scheduled to complete */
804 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
805 if (atomic_read(&mddev
->pending_writes
)==0)
809 finish_wait(&mddev
->sb_wait
, &wq
);
812 static void bi_complete(struct bio
*bio
, int error
)
814 complete((struct completion
*)bio
->bi_private
);
817 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
818 struct page
*page
, int rw
, bool metadata_op
)
820 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
821 struct completion event
;
826 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
827 rdev
->meta_bdev
: rdev
->bdev
;
829 bio
->bi_sector
= sector
+ rdev
->sb_start
;
830 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
831 (rdev
->mddev
->reshape_backwards
==
832 (sector
>= rdev
->mddev
->reshape_position
)))
833 bio
->bi_sector
= sector
+ rdev
->new_data_offset
;
835 bio
->bi_sector
= sector
+ rdev
->data_offset
;
836 bio_add_page(bio
, page
, size
, 0);
837 init_completion(&event
);
838 bio
->bi_private
= &event
;
839 bio
->bi_end_io
= bi_complete
;
841 wait_for_completion(&event
);
843 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
847 EXPORT_SYMBOL_GPL(sync_page_io
);
849 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
851 char b
[BDEVNAME_SIZE
];
852 if (!rdev
->sb_page
) {
860 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
866 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
867 bdevname(rdev
->bdev
,b
));
871 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
873 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
874 sb1
->set_uuid1
== sb2
->set_uuid1
&&
875 sb1
->set_uuid2
== sb2
->set_uuid2
&&
876 sb1
->set_uuid3
== sb2
->set_uuid3
;
879 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
882 mdp_super_t
*tmp1
, *tmp2
;
884 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
885 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
887 if (!tmp1
|| !tmp2
) {
889 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
897 * nr_disks is not constant
902 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
910 static u32
md_csum_fold(u32 csum
)
912 csum
= (csum
& 0xffff) + (csum
>> 16);
913 return (csum
& 0xffff) + (csum
>> 16);
916 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
919 u32
*sb32
= (u32
*)sb
;
921 unsigned int disk_csum
, csum
;
923 disk_csum
= sb
->sb_csum
;
926 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
928 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
932 /* This used to use csum_partial, which was wrong for several
933 * reasons including that different results are returned on
934 * different architectures. It isn't critical that we get exactly
935 * the same return value as before (we always csum_fold before
936 * testing, and that removes any differences). However as we
937 * know that csum_partial always returned a 16bit value on
938 * alphas, do a fold to maximise conformity to previous behaviour.
940 sb
->sb_csum
= md_csum_fold(disk_csum
);
942 sb
->sb_csum
= disk_csum
;
949 * Handle superblock details.
950 * We want to be able to handle multiple superblock formats
951 * so we have a common interface to them all, and an array of
952 * different handlers.
953 * We rely on user-space to write the initial superblock, and support
954 * reading and updating of superblocks.
955 * Interface methods are:
956 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
957 * loads and validates a superblock on dev.
958 * if refdev != NULL, compare superblocks on both devices
960 * 0 - dev has a superblock that is compatible with refdev
961 * 1 - dev has a superblock that is compatible and newer than refdev
962 * so dev should be used as the refdev in future
963 * -EINVAL superblock incompatible or invalid
964 * -othererror e.g. -EIO
966 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
967 * Verify that dev is acceptable into mddev.
968 * The first time, mddev->raid_disks will be 0, and data from
969 * dev should be merged in. Subsequent calls check that dev
970 * is new enough. Return 0 or -EINVAL
972 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
973 * Update the superblock for rdev with data in mddev
974 * This does not write to disc.
980 struct module
*owner
;
981 int (*load_super
)(struct md_rdev
*rdev
,
982 struct md_rdev
*refdev
,
984 int (*validate_super
)(struct mddev
*mddev
,
985 struct md_rdev
*rdev
);
986 void (*sync_super
)(struct mddev
*mddev
,
987 struct md_rdev
*rdev
);
988 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
989 sector_t num_sectors
);
990 int (*allow_new_offset
)(struct md_rdev
*rdev
,
991 unsigned long long new_offset
);
995 * Check that the given mddev has no bitmap.
997 * This function is called from the run method of all personalities that do not
998 * support bitmaps. It prints an error message and returns non-zero if mddev
999 * has a bitmap. Otherwise, it returns 0.
1002 int md_check_no_bitmap(struct mddev
*mddev
)
1004 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1006 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1007 mdname(mddev
), mddev
->pers
->name
);
1010 EXPORT_SYMBOL(md_check_no_bitmap
);
1013 * load_super for 0.90.0
1015 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1017 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1022 * Calculate the position of the superblock (512byte sectors),
1023 * it's at the end of the disk.
1025 * It also happens to be a multiple of 4Kb.
1027 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1029 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1030 if (ret
) return ret
;
1034 bdevname(rdev
->bdev
, b
);
1035 sb
= page_address(rdev
->sb_page
);
1037 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1038 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1043 if (sb
->major_version
!= 0 ||
1044 sb
->minor_version
< 90 ||
1045 sb
->minor_version
> 91) {
1046 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1047 sb
->major_version
, sb
->minor_version
,
1052 if (sb
->raid_disks
<= 0)
1055 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1056 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1061 rdev
->preferred_minor
= sb
->md_minor
;
1062 rdev
->data_offset
= 0;
1063 rdev
->new_data_offset
= 0;
1064 rdev
->sb_size
= MD_SB_BYTES
;
1065 rdev
->badblocks
.shift
= -1;
1067 if (sb
->level
== LEVEL_MULTIPATH
)
1070 rdev
->desc_nr
= sb
->this_disk
.number
;
1076 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1077 if (!uuid_equal(refsb
, sb
)) {
1078 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1079 b
, bdevname(refdev
->bdev
,b2
));
1082 if (!sb_equal(refsb
, sb
)) {
1083 printk(KERN_WARNING
"md: %s has same UUID"
1084 " but different superblock to %s\n",
1085 b
, bdevname(refdev
->bdev
, b2
));
1089 ev2
= md_event(refsb
);
1095 rdev
->sectors
= rdev
->sb_start
;
1096 /* Limit to 4TB as metadata cannot record more than that.
1097 * (not needed for Linear and RAID0 as metadata doesn't
1100 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1101 rdev
->sectors
= (2ULL << 32) - 2;
1103 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1104 /* "this cannot possibly happen" ... */
1112 * validate_super for 0.90.0
1114 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1117 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1118 __u64 ev1
= md_event(sb
);
1120 rdev
->raid_disk
= -1;
1121 clear_bit(Faulty
, &rdev
->flags
);
1122 clear_bit(In_sync
, &rdev
->flags
);
1123 clear_bit(WriteMostly
, &rdev
->flags
);
1125 if (mddev
->raid_disks
== 0) {
1126 mddev
->major_version
= 0;
1127 mddev
->minor_version
= sb
->minor_version
;
1128 mddev
->patch_version
= sb
->patch_version
;
1129 mddev
->external
= 0;
1130 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1131 mddev
->ctime
= sb
->ctime
;
1132 mddev
->utime
= sb
->utime
;
1133 mddev
->level
= sb
->level
;
1134 mddev
->clevel
[0] = 0;
1135 mddev
->layout
= sb
->layout
;
1136 mddev
->raid_disks
= sb
->raid_disks
;
1137 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1138 mddev
->events
= ev1
;
1139 mddev
->bitmap_info
.offset
= 0;
1140 mddev
->bitmap_info
.space
= 0;
1141 /* bitmap can use 60 K after the 4K superblocks */
1142 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1143 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1144 mddev
->reshape_backwards
= 0;
1146 if (mddev
->minor_version
>= 91) {
1147 mddev
->reshape_position
= sb
->reshape_position
;
1148 mddev
->delta_disks
= sb
->delta_disks
;
1149 mddev
->new_level
= sb
->new_level
;
1150 mddev
->new_layout
= sb
->new_layout
;
1151 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1152 if (mddev
->delta_disks
< 0)
1153 mddev
->reshape_backwards
= 1;
1155 mddev
->reshape_position
= MaxSector
;
1156 mddev
->delta_disks
= 0;
1157 mddev
->new_level
= mddev
->level
;
1158 mddev
->new_layout
= mddev
->layout
;
1159 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1162 if (sb
->state
& (1<<MD_SB_CLEAN
))
1163 mddev
->recovery_cp
= MaxSector
;
1165 if (sb
->events_hi
== sb
->cp_events_hi
&&
1166 sb
->events_lo
== sb
->cp_events_lo
) {
1167 mddev
->recovery_cp
= sb
->recovery_cp
;
1169 mddev
->recovery_cp
= 0;
1172 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1173 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1174 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1175 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1177 mddev
->max_disks
= MD_SB_DISKS
;
1179 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1180 mddev
->bitmap_info
.file
== NULL
) {
1181 mddev
->bitmap_info
.offset
=
1182 mddev
->bitmap_info
.default_offset
;
1183 mddev
->bitmap_info
.space
=
1184 mddev
->bitmap_info
.space
;
1187 } else if (mddev
->pers
== NULL
) {
1188 /* Insist on good event counter while assembling, except
1189 * for spares (which don't need an event count) */
1191 if (sb
->disks
[rdev
->desc_nr
].state
& (
1192 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1193 if (ev1
< mddev
->events
)
1195 } else if (mddev
->bitmap
) {
1196 /* if adding to array with a bitmap, then we can accept an
1197 * older device ... but not too old.
1199 if (ev1
< mddev
->bitmap
->events_cleared
)
1202 if (ev1
< mddev
->events
)
1203 /* just a hot-add of a new device, leave raid_disk at -1 */
1207 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1208 desc
= sb
->disks
+ rdev
->desc_nr
;
1210 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1211 set_bit(Faulty
, &rdev
->flags
);
1212 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1213 desc->raid_disk < mddev->raid_disks */) {
1214 set_bit(In_sync
, &rdev
->flags
);
1215 rdev
->raid_disk
= desc
->raid_disk
;
1216 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1217 /* active but not in sync implies recovery up to
1218 * reshape position. We don't know exactly where
1219 * that is, so set to zero for now */
1220 if (mddev
->minor_version
>= 91) {
1221 rdev
->recovery_offset
= 0;
1222 rdev
->raid_disk
= desc
->raid_disk
;
1225 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1226 set_bit(WriteMostly
, &rdev
->flags
);
1227 } else /* MULTIPATH are always insync */
1228 set_bit(In_sync
, &rdev
->flags
);
1233 * sync_super for 0.90.0
1235 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1238 struct md_rdev
*rdev2
;
1239 int next_spare
= mddev
->raid_disks
;
1242 /* make rdev->sb match mddev data..
1245 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1246 * 3/ any empty disks < next_spare become removed
1248 * disks[0] gets initialised to REMOVED because
1249 * we cannot be sure from other fields if it has
1250 * been initialised or not.
1253 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1255 rdev
->sb_size
= MD_SB_BYTES
;
1257 sb
= page_address(rdev
->sb_page
);
1259 memset(sb
, 0, sizeof(*sb
));
1261 sb
->md_magic
= MD_SB_MAGIC
;
1262 sb
->major_version
= mddev
->major_version
;
1263 sb
->patch_version
= mddev
->patch_version
;
1264 sb
->gvalid_words
= 0; /* ignored */
1265 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1266 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1267 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1268 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1270 sb
->ctime
= mddev
->ctime
;
1271 sb
->level
= mddev
->level
;
1272 sb
->size
= mddev
->dev_sectors
/ 2;
1273 sb
->raid_disks
= mddev
->raid_disks
;
1274 sb
->md_minor
= mddev
->md_minor
;
1275 sb
->not_persistent
= 0;
1276 sb
->utime
= mddev
->utime
;
1278 sb
->events_hi
= (mddev
->events
>>32);
1279 sb
->events_lo
= (u32
)mddev
->events
;
1281 if (mddev
->reshape_position
== MaxSector
)
1282 sb
->minor_version
= 90;
1284 sb
->minor_version
= 91;
1285 sb
->reshape_position
= mddev
->reshape_position
;
1286 sb
->new_level
= mddev
->new_level
;
1287 sb
->delta_disks
= mddev
->delta_disks
;
1288 sb
->new_layout
= mddev
->new_layout
;
1289 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1291 mddev
->minor_version
= sb
->minor_version
;
1294 sb
->recovery_cp
= mddev
->recovery_cp
;
1295 sb
->cp_events_hi
= (mddev
->events
>>32);
1296 sb
->cp_events_lo
= (u32
)mddev
->events
;
1297 if (mddev
->recovery_cp
== MaxSector
)
1298 sb
->state
= (1<< MD_SB_CLEAN
);
1300 sb
->recovery_cp
= 0;
1302 sb
->layout
= mddev
->layout
;
1303 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1305 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1306 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1308 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1309 rdev_for_each(rdev2
, mddev
) {
1312 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1314 if (rdev2
->raid_disk
>= 0 &&
1315 sb
->minor_version
>= 91)
1316 /* we have nowhere to store the recovery_offset,
1317 * but if it is not below the reshape_position,
1318 * we can piggy-back on that.
1321 if (rdev2
->raid_disk
< 0 ||
1322 test_bit(Faulty
, &rdev2
->flags
))
1325 desc_nr
= rdev2
->raid_disk
;
1327 desc_nr
= next_spare
++;
1328 rdev2
->desc_nr
= desc_nr
;
1329 d
= &sb
->disks
[rdev2
->desc_nr
];
1331 d
->number
= rdev2
->desc_nr
;
1332 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1333 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1335 d
->raid_disk
= rdev2
->raid_disk
;
1337 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1338 if (test_bit(Faulty
, &rdev2
->flags
))
1339 d
->state
= (1<<MD_DISK_FAULTY
);
1340 else if (is_active
) {
1341 d
->state
= (1<<MD_DISK_ACTIVE
);
1342 if (test_bit(In_sync
, &rdev2
->flags
))
1343 d
->state
|= (1<<MD_DISK_SYNC
);
1351 if (test_bit(WriteMostly
, &rdev2
->flags
))
1352 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1354 /* now set the "removed" and "faulty" bits on any missing devices */
1355 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1356 mdp_disk_t
*d
= &sb
->disks
[i
];
1357 if (d
->state
== 0 && d
->number
== 0) {
1360 d
->state
= (1<<MD_DISK_REMOVED
);
1361 d
->state
|= (1<<MD_DISK_FAULTY
);
1365 sb
->nr_disks
= nr_disks
;
1366 sb
->active_disks
= active
;
1367 sb
->working_disks
= working
;
1368 sb
->failed_disks
= failed
;
1369 sb
->spare_disks
= spare
;
1371 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1372 sb
->sb_csum
= calc_sb_csum(sb
);
1376 * rdev_size_change for 0.90.0
1378 static unsigned long long
1379 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1381 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1382 return 0; /* component must fit device */
1383 if (rdev
->mddev
->bitmap_info
.offset
)
1384 return 0; /* can't move bitmap */
1385 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1386 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1387 num_sectors
= rdev
->sb_start
;
1388 /* Limit to 4TB as metadata cannot record more than that.
1389 * 4TB == 2^32 KB, or 2*2^32 sectors.
1391 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1392 num_sectors
= (2ULL << 32) - 2;
1393 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1395 md_super_wait(rdev
->mddev
);
1400 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1402 /* non-zero offset changes not possible with v0.90 */
1403 return new_offset
== 0;
1407 * version 1 superblock
1410 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1414 unsigned long long newcsum
;
1415 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1416 __le32
*isuper
= (__le32
*)sb
;
1419 disk_csum
= sb
->sb_csum
;
1422 for (i
=0; size
>=4; size
-= 4 )
1423 newcsum
+= le32_to_cpu(*isuper
++);
1426 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1428 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1429 sb
->sb_csum
= disk_csum
;
1430 return cpu_to_le32(csum
);
1433 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1435 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1437 struct mdp_superblock_1
*sb
;
1441 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1445 * Calculate the position of the superblock in 512byte sectors.
1446 * It is always aligned to a 4K boundary and
1447 * depeding on minor_version, it can be:
1448 * 0: At least 8K, but less than 12K, from end of device
1449 * 1: At start of device
1450 * 2: 4K from start of device.
1452 switch(minor_version
) {
1454 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1456 sb_start
&= ~(sector_t
)(4*2-1);
1467 rdev
->sb_start
= sb_start
;
1469 /* superblock is rarely larger than 1K, but it can be larger,
1470 * and it is safe to read 4k, so we do that
1472 ret
= read_disk_sb(rdev
, 4096);
1473 if (ret
) return ret
;
1476 sb
= page_address(rdev
->sb_page
);
1478 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1479 sb
->major_version
!= cpu_to_le32(1) ||
1480 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1481 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1482 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1485 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1486 printk("md: invalid superblock checksum on %s\n",
1487 bdevname(rdev
->bdev
,b
));
1490 if (le64_to_cpu(sb
->data_size
) < 10) {
1491 printk("md: data_size too small on %s\n",
1492 bdevname(rdev
->bdev
,b
));
1497 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1498 /* Some padding is non-zero, might be a new feature */
1501 rdev
->preferred_minor
= 0xffff;
1502 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1503 rdev
->new_data_offset
= rdev
->data_offset
;
1504 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1505 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1506 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1507 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1509 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1510 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1511 if (rdev
->sb_size
& bmask
)
1512 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1515 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1518 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1521 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1524 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1526 if (!rdev
->bb_page
) {
1527 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1531 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1532 rdev
->badblocks
.count
== 0) {
1533 /* need to load the bad block list.
1534 * Currently we limit it to one page.
1540 int sectors
= le16_to_cpu(sb
->bblog_size
);
1541 if (sectors
> (PAGE_SIZE
/ 512))
1543 offset
= le32_to_cpu(sb
->bblog_offset
);
1546 bb_sector
= (long long)offset
;
1547 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1548 rdev
->bb_page
, READ
, true))
1550 bbp
= (u64
*)page_address(rdev
->bb_page
);
1551 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1552 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1553 u64 bb
= le64_to_cpu(*bbp
);
1554 int count
= bb
& (0x3ff);
1555 u64 sector
= bb
>> 10;
1556 sector
<<= sb
->bblog_shift
;
1557 count
<<= sb
->bblog_shift
;
1560 if (md_set_badblocks(&rdev
->badblocks
,
1561 sector
, count
, 1) == 0)
1564 } else if (sb
->bblog_offset
== 0)
1565 rdev
->badblocks
.shift
= -1;
1571 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1573 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1574 sb
->level
!= refsb
->level
||
1575 sb
->layout
!= refsb
->layout
||
1576 sb
->chunksize
!= refsb
->chunksize
) {
1577 printk(KERN_WARNING
"md: %s has strangely different"
1578 " superblock to %s\n",
1579 bdevname(rdev
->bdev
,b
),
1580 bdevname(refdev
->bdev
,b2
));
1583 ev1
= le64_to_cpu(sb
->events
);
1584 ev2
= le64_to_cpu(refsb
->events
);
1591 if (minor_version
) {
1592 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1593 sectors
-= rdev
->data_offset
;
1595 sectors
= rdev
->sb_start
;
1596 if (sectors
< le64_to_cpu(sb
->data_size
))
1598 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1602 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1604 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1605 __u64 ev1
= le64_to_cpu(sb
->events
);
1607 rdev
->raid_disk
= -1;
1608 clear_bit(Faulty
, &rdev
->flags
);
1609 clear_bit(In_sync
, &rdev
->flags
);
1610 clear_bit(WriteMostly
, &rdev
->flags
);
1612 if (mddev
->raid_disks
== 0) {
1613 mddev
->major_version
= 1;
1614 mddev
->patch_version
= 0;
1615 mddev
->external
= 0;
1616 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1617 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1618 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1619 mddev
->level
= le32_to_cpu(sb
->level
);
1620 mddev
->clevel
[0] = 0;
1621 mddev
->layout
= le32_to_cpu(sb
->layout
);
1622 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1623 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1624 mddev
->events
= ev1
;
1625 mddev
->bitmap_info
.offset
= 0;
1626 mddev
->bitmap_info
.space
= 0;
1627 /* Default location for bitmap is 1K after superblock
1628 * using 3K - total of 4K
1630 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1631 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1632 mddev
->reshape_backwards
= 0;
1634 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1635 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1637 mddev
->max_disks
= (4096-256)/2;
1639 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1640 mddev
->bitmap_info
.file
== NULL
) {
1641 mddev
->bitmap_info
.offset
=
1642 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1643 /* Metadata doesn't record how much space is available.
1644 * For 1.0, we assume we can use up to the superblock
1645 * if before, else to 4K beyond superblock.
1646 * For others, assume no change is possible.
1648 if (mddev
->minor_version
> 0)
1649 mddev
->bitmap_info
.space
= 0;
1650 else if (mddev
->bitmap_info
.offset
> 0)
1651 mddev
->bitmap_info
.space
=
1652 8 - mddev
->bitmap_info
.offset
;
1654 mddev
->bitmap_info
.space
=
1655 -mddev
->bitmap_info
.offset
;
1658 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1659 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1660 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1661 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1662 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1663 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1664 if (mddev
->delta_disks
< 0 ||
1665 (mddev
->delta_disks
== 0 &&
1666 (le32_to_cpu(sb
->feature_map
)
1667 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1668 mddev
->reshape_backwards
= 1;
1670 mddev
->reshape_position
= MaxSector
;
1671 mddev
->delta_disks
= 0;
1672 mddev
->new_level
= mddev
->level
;
1673 mddev
->new_layout
= mddev
->layout
;
1674 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1677 } else if (mddev
->pers
== NULL
) {
1678 /* Insist of good event counter while assembling, except for
1679 * spares (which don't need an event count) */
1681 if (rdev
->desc_nr
>= 0 &&
1682 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1683 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1684 if (ev1
< mddev
->events
)
1686 } else if (mddev
->bitmap
) {
1687 /* If adding to array with a bitmap, then we can accept an
1688 * older device, but not too old.
1690 if (ev1
< mddev
->bitmap
->events_cleared
)
1693 if (ev1
< mddev
->events
)
1694 /* just a hot-add of a new device, leave raid_disk at -1 */
1697 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1699 if (rdev
->desc_nr
< 0 ||
1700 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1704 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1706 case 0xffff: /* spare */
1708 case 0xfffe: /* faulty */
1709 set_bit(Faulty
, &rdev
->flags
);
1712 if ((le32_to_cpu(sb
->feature_map
) &
1713 MD_FEATURE_RECOVERY_OFFSET
))
1714 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1716 set_bit(In_sync
, &rdev
->flags
);
1717 rdev
->raid_disk
= role
;
1720 if (sb
->devflags
& WriteMostly1
)
1721 set_bit(WriteMostly
, &rdev
->flags
);
1722 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1723 set_bit(Replacement
, &rdev
->flags
);
1724 } else /* MULTIPATH are always insync */
1725 set_bit(In_sync
, &rdev
->flags
);
1730 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1732 struct mdp_superblock_1
*sb
;
1733 struct md_rdev
*rdev2
;
1735 /* make rdev->sb match mddev and rdev data. */
1737 sb
= page_address(rdev
->sb_page
);
1739 sb
->feature_map
= 0;
1741 sb
->recovery_offset
= cpu_to_le64(0);
1742 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1744 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1745 sb
->events
= cpu_to_le64(mddev
->events
);
1747 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1749 sb
->resync_offset
= cpu_to_le64(0);
1751 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1753 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1754 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1755 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1756 sb
->level
= cpu_to_le32(mddev
->level
);
1757 sb
->layout
= cpu_to_le32(mddev
->layout
);
1759 if (test_bit(WriteMostly
, &rdev
->flags
))
1760 sb
->devflags
|= WriteMostly1
;
1762 sb
->devflags
&= ~WriteMostly1
;
1763 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1764 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1766 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1767 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1768 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1771 if (rdev
->raid_disk
>= 0 &&
1772 !test_bit(In_sync
, &rdev
->flags
)) {
1774 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1775 sb
->recovery_offset
=
1776 cpu_to_le64(rdev
->recovery_offset
);
1778 if (test_bit(Replacement
, &rdev
->flags
))
1780 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1782 if (mddev
->reshape_position
!= MaxSector
) {
1783 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1784 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1785 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1786 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1787 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1788 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1789 if (mddev
->delta_disks
== 0 &&
1790 mddev
->reshape_backwards
)
1792 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1793 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1795 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1796 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1797 - rdev
->data_offset
));
1801 if (rdev
->badblocks
.count
== 0)
1802 /* Nothing to do for bad blocks*/ ;
1803 else if (sb
->bblog_offset
== 0)
1804 /* Cannot record bad blocks on this device */
1805 md_error(mddev
, rdev
);
1807 struct badblocks
*bb
= &rdev
->badblocks
;
1808 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1810 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1815 seq
= read_seqbegin(&bb
->lock
);
1817 memset(bbp
, 0xff, PAGE_SIZE
);
1819 for (i
= 0 ; i
< bb
->count
; i
++) {
1820 u64 internal_bb
= *p
++;
1821 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1822 | BB_LEN(internal_bb
));
1823 *bbp
++ = cpu_to_le64(store_bb
);
1826 if (read_seqretry(&bb
->lock
, seq
))
1829 bb
->sector
= (rdev
->sb_start
+
1830 (int)le32_to_cpu(sb
->bblog_offset
));
1831 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1836 rdev_for_each(rdev2
, mddev
)
1837 if (rdev2
->desc_nr
+1 > max_dev
)
1838 max_dev
= rdev2
->desc_nr
+1;
1840 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1842 sb
->max_dev
= cpu_to_le32(max_dev
);
1843 rdev
->sb_size
= max_dev
* 2 + 256;
1844 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1845 if (rdev
->sb_size
& bmask
)
1846 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1848 max_dev
= le32_to_cpu(sb
->max_dev
);
1850 for (i
=0; i
<max_dev
;i
++)
1851 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1853 rdev_for_each(rdev2
, mddev
) {
1855 if (test_bit(Faulty
, &rdev2
->flags
))
1856 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1857 else if (test_bit(In_sync
, &rdev2
->flags
))
1858 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1859 else if (rdev2
->raid_disk
>= 0)
1860 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1862 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1865 sb
->sb_csum
= calc_sb_1_csum(sb
);
1868 static unsigned long long
1869 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1871 struct mdp_superblock_1
*sb
;
1872 sector_t max_sectors
;
1873 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1874 return 0; /* component must fit device */
1875 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1876 return 0; /* too confusing */
1877 if (rdev
->sb_start
< rdev
->data_offset
) {
1878 /* minor versions 1 and 2; superblock before data */
1879 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1880 max_sectors
-= rdev
->data_offset
;
1881 if (!num_sectors
|| num_sectors
> max_sectors
)
1882 num_sectors
= max_sectors
;
1883 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1884 /* minor version 0 with bitmap we can't move */
1887 /* minor version 0; superblock after data */
1889 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1890 sb_start
&= ~(sector_t
)(4*2 - 1);
1891 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1892 if (!num_sectors
|| num_sectors
> max_sectors
)
1893 num_sectors
= max_sectors
;
1894 rdev
->sb_start
= sb_start
;
1896 sb
= page_address(rdev
->sb_page
);
1897 sb
->data_size
= cpu_to_le64(num_sectors
);
1898 sb
->super_offset
= rdev
->sb_start
;
1899 sb
->sb_csum
= calc_sb_1_csum(sb
);
1900 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1902 md_super_wait(rdev
->mddev
);
1908 super_1_allow_new_offset(struct md_rdev
*rdev
,
1909 unsigned long long new_offset
)
1911 /* All necessary checks on new >= old have been done */
1912 struct bitmap
*bitmap
;
1913 if (new_offset
>= rdev
->data_offset
)
1916 /* with 1.0 metadata, there is no metadata to tread on
1917 * so we can always move back */
1918 if (rdev
->mddev
->minor_version
== 0)
1921 /* otherwise we must be sure not to step on
1922 * any metadata, so stay:
1923 * 36K beyond start of superblock
1924 * beyond end of badblocks
1925 * beyond write-intent bitmap
1927 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1929 bitmap
= rdev
->mddev
->bitmap
;
1930 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1931 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1932 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1934 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1940 static struct super_type super_types
[] = {
1943 .owner
= THIS_MODULE
,
1944 .load_super
= super_90_load
,
1945 .validate_super
= super_90_validate
,
1946 .sync_super
= super_90_sync
,
1947 .rdev_size_change
= super_90_rdev_size_change
,
1948 .allow_new_offset
= super_90_allow_new_offset
,
1952 .owner
= THIS_MODULE
,
1953 .load_super
= super_1_load
,
1954 .validate_super
= super_1_validate
,
1955 .sync_super
= super_1_sync
,
1956 .rdev_size_change
= super_1_rdev_size_change
,
1957 .allow_new_offset
= super_1_allow_new_offset
,
1961 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1963 if (mddev
->sync_super
) {
1964 mddev
->sync_super(mddev
, rdev
);
1968 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1970 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1973 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1975 struct md_rdev
*rdev
, *rdev2
;
1978 rdev_for_each_rcu(rdev
, mddev1
)
1979 rdev_for_each_rcu(rdev2
, mddev2
)
1980 if (rdev
->bdev
->bd_contains
==
1981 rdev2
->bdev
->bd_contains
) {
1989 static LIST_HEAD(pending_raid_disks
);
1992 * Try to register data integrity profile for an mddev
1994 * This is called when an array is started and after a disk has been kicked
1995 * from the array. It only succeeds if all working and active component devices
1996 * are integrity capable with matching profiles.
1998 int md_integrity_register(struct mddev
*mddev
)
2000 struct md_rdev
*rdev
, *reference
= NULL
;
2002 if (list_empty(&mddev
->disks
))
2003 return 0; /* nothing to do */
2004 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2005 return 0; /* shouldn't register, or already is */
2006 rdev_for_each(rdev
, mddev
) {
2007 /* skip spares and non-functional disks */
2008 if (test_bit(Faulty
, &rdev
->flags
))
2010 if (rdev
->raid_disk
< 0)
2013 /* Use the first rdev as the reference */
2017 /* does this rdev's profile match the reference profile? */
2018 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2019 rdev
->bdev
->bd_disk
) < 0)
2022 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2025 * All component devices are integrity capable and have matching
2026 * profiles, register the common profile for the md device.
2028 if (blk_integrity_register(mddev
->gendisk
,
2029 bdev_get_integrity(reference
->bdev
)) != 0) {
2030 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2034 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2035 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2036 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2042 EXPORT_SYMBOL(md_integrity_register
);
2044 /* Disable data integrity if non-capable/non-matching disk is being added */
2045 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2047 struct blk_integrity
*bi_rdev
;
2048 struct blk_integrity
*bi_mddev
;
2050 if (!mddev
->gendisk
)
2053 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2054 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2056 if (!bi_mddev
) /* nothing to do */
2058 if (rdev
->raid_disk
< 0) /* skip spares */
2060 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2061 rdev
->bdev
->bd_disk
) >= 0)
2063 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2064 blk_integrity_unregister(mddev
->gendisk
);
2066 EXPORT_SYMBOL(md_integrity_add_rdev
);
2068 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2070 char b
[BDEVNAME_SIZE
];
2080 /* prevent duplicates */
2081 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2084 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2085 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2086 rdev
->sectors
< mddev
->dev_sectors
)) {
2088 /* Cannot change size, so fail
2089 * If mddev->level <= 0, then we don't care
2090 * about aligning sizes (e.g. linear)
2092 if (mddev
->level
> 0)
2095 mddev
->dev_sectors
= rdev
->sectors
;
2098 /* Verify rdev->desc_nr is unique.
2099 * If it is -1, assign a free number, else
2100 * check number is not in use
2102 if (rdev
->desc_nr
< 0) {
2104 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2105 while (find_rdev_nr(mddev
, choice
))
2107 rdev
->desc_nr
= choice
;
2109 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2112 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2113 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2114 mdname(mddev
), mddev
->max_disks
);
2117 bdevname(rdev
->bdev
,b
);
2118 while ( (s
=strchr(b
, '/')) != NULL
)
2121 rdev
->mddev
= mddev
;
2122 printk(KERN_INFO
"md: bind<%s>\n", b
);
2124 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2127 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2128 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2129 /* failure here is OK */;
2130 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2132 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2133 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2135 /* May as well allow recovery to be retried once */
2136 mddev
->recovery_disabled
++;
2141 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2146 static void md_delayed_delete(struct work_struct
*ws
)
2148 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2149 kobject_del(&rdev
->kobj
);
2150 kobject_put(&rdev
->kobj
);
2153 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2155 char b
[BDEVNAME_SIZE
];
2160 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2161 list_del_rcu(&rdev
->same_set
);
2162 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2164 sysfs_remove_link(&rdev
->kobj
, "block");
2165 sysfs_put(rdev
->sysfs_state
);
2166 rdev
->sysfs_state
= NULL
;
2167 rdev
->badblocks
.count
= 0;
2168 /* We need to delay this, otherwise we can deadlock when
2169 * writing to 'remove' to "dev/state". We also need
2170 * to delay it due to rcu usage.
2173 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2174 kobject_get(&rdev
->kobj
);
2175 queue_work(md_misc_wq
, &rdev
->del_work
);
2179 * prevent the device from being mounted, repartitioned or
2180 * otherwise reused by a RAID array (or any other kernel
2181 * subsystem), by bd_claiming the device.
2183 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2186 struct block_device
*bdev
;
2187 char b
[BDEVNAME_SIZE
];
2189 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2190 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2192 printk(KERN_ERR
"md: could not open %s.\n",
2193 __bdevname(dev
, b
));
2194 return PTR_ERR(bdev
);
2200 static void unlock_rdev(struct md_rdev
*rdev
)
2202 struct block_device
*bdev
= rdev
->bdev
;
2206 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2209 void md_autodetect_dev(dev_t dev
);
2211 static void export_rdev(struct md_rdev
* rdev
)
2213 char b
[BDEVNAME_SIZE
];
2214 printk(KERN_INFO
"md: export_rdev(%s)\n",
2215 bdevname(rdev
->bdev
,b
));
2218 md_rdev_clear(rdev
);
2220 if (test_bit(AutoDetected
, &rdev
->flags
))
2221 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2224 kobject_put(&rdev
->kobj
);
2227 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2229 unbind_rdev_from_array(rdev
);
2233 static void export_array(struct mddev
*mddev
)
2235 struct md_rdev
*rdev
, *tmp
;
2237 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2242 kick_rdev_from_array(rdev
);
2244 if (!list_empty(&mddev
->disks
))
2246 mddev
->raid_disks
= 0;
2247 mddev
->major_version
= 0;
2250 static void print_desc(mdp_disk_t
*desc
)
2252 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2253 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2256 static void print_sb_90(mdp_super_t
*sb
)
2261 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2262 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2263 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2265 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2266 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2267 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2268 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2269 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2270 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2271 sb
->failed_disks
, sb
->spare_disks
,
2272 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2275 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2278 desc
= sb
->disks
+ i
;
2279 if (desc
->number
|| desc
->major
|| desc
->minor
||
2280 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2281 printk(" D %2d: ", i
);
2285 printk(KERN_INFO
"md: THIS: ");
2286 print_desc(&sb
->this_disk
);
2289 static void print_sb_1(struct mdp_superblock_1
*sb
)
2293 uuid
= sb
->set_uuid
;
2295 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2296 "md: Name: \"%s\" CT:%llu\n",
2297 le32_to_cpu(sb
->major_version
),
2298 le32_to_cpu(sb
->feature_map
),
2301 (unsigned long long)le64_to_cpu(sb
->ctime
)
2302 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2304 uuid
= sb
->device_uuid
;
2306 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2308 "md: Dev:%08x UUID: %pU\n"
2309 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2310 "md: (MaxDev:%u) \n",
2311 le32_to_cpu(sb
->level
),
2312 (unsigned long long)le64_to_cpu(sb
->size
),
2313 le32_to_cpu(sb
->raid_disks
),
2314 le32_to_cpu(sb
->layout
),
2315 le32_to_cpu(sb
->chunksize
),
2316 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2317 (unsigned long long)le64_to_cpu(sb
->data_size
),
2318 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2319 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2320 le32_to_cpu(sb
->dev_number
),
2323 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2324 (unsigned long long)le64_to_cpu(sb
->events
),
2325 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2326 le32_to_cpu(sb
->sb_csum
),
2327 le32_to_cpu(sb
->max_dev
)
2331 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2333 char b
[BDEVNAME_SIZE
];
2334 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2335 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2336 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2338 if (rdev
->sb_loaded
) {
2339 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2340 switch (major_version
) {
2342 print_sb_90(page_address(rdev
->sb_page
));
2345 print_sb_1(page_address(rdev
->sb_page
));
2349 printk(KERN_INFO
"md: no rdev superblock!\n");
2352 static void md_print_devices(void)
2354 struct list_head
*tmp
;
2355 struct md_rdev
*rdev
;
2356 struct mddev
*mddev
;
2357 char b
[BDEVNAME_SIZE
];
2360 printk("md: **********************************\n");
2361 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2362 printk("md: **********************************\n");
2363 for_each_mddev(mddev
, tmp
) {
2366 bitmap_print_sb(mddev
->bitmap
);
2368 printk("%s: ", mdname(mddev
));
2369 rdev_for_each(rdev
, mddev
)
2370 printk("<%s>", bdevname(rdev
->bdev
,b
));
2373 rdev_for_each(rdev
, mddev
)
2374 print_rdev(rdev
, mddev
->major_version
);
2376 printk("md: **********************************\n");
2381 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2383 /* Update each superblock (in-memory image), but
2384 * if we are allowed to, skip spares which already
2385 * have the right event counter, or have one earlier
2386 * (which would mean they aren't being marked as dirty
2387 * with the rest of the array)
2389 struct md_rdev
*rdev
;
2390 rdev_for_each(rdev
, mddev
) {
2391 if (rdev
->sb_events
== mddev
->events
||
2393 rdev
->raid_disk
< 0 &&
2394 rdev
->sb_events
+1 == mddev
->events
)) {
2395 /* Don't update this superblock */
2396 rdev
->sb_loaded
= 2;
2398 sync_super(mddev
, rdev
);
2399 rdev
->sb_loaded
= 1;
2404 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2406 struct md_rdev
*rdev
;
2409 int any_badblocks_changed
= 0;
2412 /* First make sure individual recovery_offsets are correct */
2413 rdev_for_each(rdev
, mddev
) {
2414 if (rdev
->raid_disk
>= 0 &&
2415 mddev
->delta_disks
>= 0 &&
2416 !test_bit(In_sync
, &rdev
->flags
) &&
2417 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2418 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2421 if (!mddev
->persistent
) {
2422 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2423 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2424 if (!mddev
->external
) {
2425 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2426 rdev_for_each(rdev
, mddev
) {
2427 if (rdev
->badblocks
.changed
) {
2428 rdev
->badblocks
.changed
= 0;
2429 md_ack_all_badblocks(&rdev
->badblocks
);
2430 md_error(mddev
, rdev
);
2432 clear_bit(Blocked
, &rdev
->flags
);
2433 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2434 wake_up(&rdev
->blocked_wait
);
2437 wake_up(&mddev
->sb_wait
);
2441 spin_lock_irq(&mddev
->write_lock
);
2443 mddev
->utime
= get_seconds();
2445 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2447 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2448 /* just a clean<-> dirty transition, possibly leave spares alone,
2449 * though if events isn't the right even/odd, we will have to do
2455 if (mddev
->degraded
)
2456 /* If the array is degraded, then skipping spares is both
2457 * dangerous and fairly pointless.
2458 * Dangerous because a device that was removed from the array
2459 * might have a event_count that still looks up-to-date,
2460 * so it can be re-added without a resync.
2461 * Pointless because if there are any spares to skip,
2462 * then a recovery will happen and soon that array won't
2463 * be degraded any more and the spare can go back to sleep then.
2467 sync_req
= mddev
->in_sync
;
2469 /* If this is just a dirty<->clean transition, and the array is clean
2470 * and 'events' is odd, we can roll back to the previous clean state */
2472 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2473 && mddev
->can_decrease_events
2474 && mddev
->events
!= 1) {
2476 mddev
->can_decrease_events
= 0;
2478 /* otherwise we have to go forward and ... */
2480 mddev
->can_decrease_events
= nospares
;
2483 if (!mddev
->events
) {
2485 * oops, this 64-bit counter should never wrap.
2486 * Either we are in around ~1 trillion A.C., assuming
2487 * 1 reboot per second, or we have a bug:
2493 rdev_for_each(rdev
, mddev
) {
2494 if (rdev
->badblocks
.changed
)
2495 any_badblocks_changed
++;
2496 if (test_bit(Faulty
, &rdev
->flags
))
2497 set_bit(FaultRecorded
, &rdev
->flags
);
2500 sync_sbs(mddev
, nospares
);
2501 spin_unlock_irq(&mddev
->write_lock
);
2503 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2504 mdname(mddev
), mddev
->in_sync
);
2506 bitmap_update_sb(mddev
->bitmap
);
2507 rdev_for_each(rdev
, mddev
) {
2508 char b
[BDEVNAME_SIZE
];
2510 if (rdev
->sb_loaded
!= 1)
2511 continue; /* no noise on spare devices */
2513 if (!test_bit(Faulty
, &rdev
->flags
) &&
2514 rdev
->saved_raid_disk
== -1) {
2515 md_super_write(mddev
,rdev
,
2516 rdev
->sb_start
, rdev
->sb_size
,
2518 pr_debug("md: (write) %s's sb offset: %llu\n",
2519 bdevname(rdev
->bdev
, b
),
2520 (unsigned long long)rdev
->sb_start
);
2521 rdev
->sb_events
= mddev
->events
;
2522 if (rdev
->badblocks
.size
) {
2523 md_super_write(mddev
, rdev
,
2524 rdev
->badblocks
.sector
,
2525 rdev
->badblocks
.size
<< 9,
2527 rdev
->badblocks
.size
= 0;
2530 } else if (test_bit(Faulty
, &rdev
->flags
))
2531 pr_debug("md: %s (skipping faulty)\n",
2532 bdevname(rdev
->bdev
, b
));
2534 pr_debug("(skipping incremental s/r ");
2536 if (mddev
->level
== LEVEL_MULTIPATH
)
2537 /* only need to write one superblock... */
2540 md_super_wait(mddev
);
2541 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2543 spin_lock_irq(&mddev
->write_lock
);
2544 if (mddev
->in_sync
!= sync_req
||
2545 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2546 /* have to write it out again */
2547 spin_unlock_irq(&mddev
->write_lock
);
2550 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2551 spin_unlock_irq(&mddev
->write_lock
);
2552 wake_up(&mddev
->sb_wait
);
2553 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2554 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2556 rdev_for_each(rdev
, mddev
) {
2557 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2558 clear_bit(Blocked
, &rdev
->flags
);
2560 if (any_badblocks_changed
)
2561 md_ack_all_badblocks(&rdev
->badblocks
);
2562 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2563 wake_up(&rdev
->blocked_wait
);
2567 /* words written to sysfs files may, or may not, be \n terminated.
2568 * We want to accept with case. For this we use cmd_match.
2570 static int cmd_match(const char *cmd
, const char *str
)
2572 /* See if cmd, written into a sysfs file, matches
2573 * str. They must either be the same, or cmd can
2574 * have a trailing newline
2576 while (*cmd
&& *str
&& *cmd
== *str
) {
2587 struct rdev_sysfs_entry
{
2588 struct attribute attr
;
2589 ssize_t (*show
)(struct md_rdev
*, char *);
2590 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2594 state_show(struct md_rdev
*rdev
, char *page
)
2599 if (test_bit(Faulty
, &rdev
->flags
) ||
2600 rdev
->badblocks
.unacked_exist
) {
2601 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2604 if (test_bit(In_sync
, &rdev
->flags
)) {
2605 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2608 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2609 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2612 if (test_bit(Blocked
, &rdev
->flags
) ||
2613 (rdev
->badblocks
.unacked_exist
2614 && !test_bit(Faulty
, &rdev
->flags
))) {
2615 len
+= sprintf(page
+len
, "%sblocked", sep
);
2618 if (!test_bit(Faulty
, &rdev
->flags
) &&
2619 !test_bit(In_sync
, &rdev
->flags
)) {
2620 len
+= sprintf(page
+len
, "%sspare", sep
);
2623 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2624 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2627 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2628 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2631 if (test_bit(Replacement
, &rdev
->flags
)) {
2632 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2636 return len
+sprintf(page
+len
, "\n");
2640 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2643 * faulty - simulates an error
2644 * remove - disconnects the device
2645 * writemostly - sets write_mostly
2646 * -writemostly - clears write_mostly
2647 * blocked - sets the Blocked flags
2648 * -blocked - clears the Blocked and possibly simulates an error
2649 * insync - sets Insync providing device isn't active
2650 * write_error - sets WriteErrorSeen
2651 * -write_error - clears WriteErrorSeen
2654 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2655 md_error(rdev
->mddev
, rdev
);
2656 if (test_bit(Faulty
, &rdev
->flags
))
2660 } else if (cmd_match(buf
, "remove")) {
2661 if (rdev
->raid_disk
>= 0)
2664 struct mddev
*mddev
= rdev
->mddev
;
2665 kick_rdev_from_array(rdev
);
2667 md_update_sb(mddev
, 1);
2668 md_new_event(mddev
);
2671 } else if (cmd_match(buf
, "writemostly")) {
2672 set_bit(WriteMostly
, &rdev
->flags
);
2674 } else if (cmd_match(buf
, "-writemostly")) {
2675 clear_bit(WriteMostly
, &rdev
->flags
);
2677 } else if (cmd_match(buf
, "blocked")) {
2678 set_bit(Blocked
, &rdev
->flags
);
2680 } else if (cmd_match(buf
, "-blocked")) {
2681 if (!test_bit(Faulty
, &rdev
->flags
) &&
2682 rdev
->badblocks
.unacked_exist
) {
2683 /* metadata handler doesn't understand badblocks,
2684 * so we need to fail the device
2686 md_error(rdev
->mddev
, rdev
);
2688 clear_bit(Blocked
, &rdev
->flags
);
2689 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2690 wake_up(&rdev
->blocked_wait
);
2691 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2692 md_wakeup_thread(rdev
->mddev
->thread
);
2695 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2696 set_bit(In_sync
, &rdev
->flags
);
2698 } else if (cmd_match(buf
, "write_error")) {
2699 set_bit(WriteErrorSeen
, &rdev
->flags
);
2701 } else if (cmd_match(buf
, "-write_error")) {
2702 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2704 } else if (cmd_match(buf
, "want_replacement")) {
2705 /* Any non-spare device that is not a replacement can
2706 * become want_replacement at any time, but we then need to
2707 * check if recovery is needed.
2709 if (rdev
->raid_disk
>= 0 &&
2710 !test_bit(Replacement
, &rdev
->flags
))
2711 set_bit(WantReplacement
, &rdev
->flags
);
2712 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2713 md_wakeup_thread(rdev
->mddev
->thread
);
2715 } else if (cmd_match(buf
, "-want_replacement")) {
2716 /* Clearing 'want_replacement' is always allowed.
2717 * Once replacements starts it is too late though.
2720 clear_bit(WantReplacement
, &rdev
->flags
);
2721 } else if (cmd_match(buf
, "replacement")) {
2722 /* Can only set a device as a replacement when array has not
2723 * yet been started. Once running, replacement is automatic
2724 * from spares, or by assigning 'slot'.
2726 if (rdev
->mddev
->pers
)
2729 set_bit(Replacement
, &rdev
->flags
);
2732 } else if (cmd_match(buf
, "-replacement")) {
2733 /* Similarly, can only clear Replacement before start */
2734 if (rdev
->mddev
->pers
)
2737 clear_bit(Replacement
, &rdev
->flags
);
2742 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2743 return err
? err
: len
;
2745 static struct rdev_sysfs_entry rdev_state
=
2746 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2749 errors_show(struct md_rdev
*rdev
, char *page
)
2751 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2755 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2758 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2759 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2760 atomic_set(&rdev
->corrected_errors
, n
);
2765 static struct rdev_sysfs_entry rdev_errors
=
2766 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2769 slot_show(struct md_rdev
*rdev
, char *page
)
2771 if (rdev
->raid_disk
< 0)
2772 return sprintf(page
, "none\n");
2774 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2778 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2782 int slot
= simple_strtoul(buf
, &e
, 10);
2783 if (strncmp(buf
, "none", 4)==0)
2785 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2787 if (rdev
->mddev
->pers
&& slot
== -1) {
2788 /* Setting 'slot' on an active array requires also
2789 * updating the 'rd%d' link, and communicating
2790 * with the personality with ->hot_*_disk.
2791 * For now we only support removing
2792 * failed/spare devices. This normally happens automatically,
2793 * but not when the metadata is externally managed.
2795 if (rdev
->raid_disk
== -1)
2797 /* personality does all needed checks */
2798 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2800 err
= rdev
->mddev
->pers
->
2801 hot_remove_disk(rdev
->mddev
, rdev
);
2804 sysfs_unlink_rdev(rdev
->mddev
, rdev
);
2805 rdev
->raid_disk
= -1;
2806 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2807 md_wakeup_thread(rdev
->mddev
->thread
);
2808 } else if (rdev
->mddev
->pers
) {
2809 /* Activating a spare .. or possibly reactivating
2810 * if we ever get bitmaps working here.
2813 if (rdev
->raid_disk
!= -1)
2816 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2819 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2822 if (slot
>= rdev
->mddev
->raid_disks
&&
2823 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2826 rdev
->raid_disk
= slot
;
2827 if (test_bit(In_sync
, &rdev
->flags
))
2828 rdev
->saved_raid_disk
= slot
;
2830 rdev
->saved_raid_disk
= -1;
2831 clear_bit(In_sync
, &rdev
->flags
);
2832 err
= rdev
->mddev
->pers
->
2833 hot_add_disk(rdev
->mddev
, rdev
);
2835 rdev
->raid_disk
= -1;
2838 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2839 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2840 /* failure here is OK */;
2841 /* don't wakeup anyone, leave that to userspace. */
2843 if (slot
>= rdev
->mddev
->raid_disks
&&
2844 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2846 rdev
->raid_disk
= slot
;
2847 /* assume it is working */
2848 clear_bit(Faulty
, &rdev
->flags
);
2849 clear_bit(WriteMostly
, &rdev
->flags
);
2850 set_bit(In_sync
, &rdev
->flags
);
2851 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2857 static struct rdev_sysfs_entry rdev_slot
=
2858 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2861 offset_show(struct md_rdev
*rdev
, char *page
)
2863 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2867 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2869 unsigned long long offset
;
2870 if (strict_strtoull(buf
, 10, &offset
) < 0)
2872 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2874 if (rdev
->sectors
&& rdev
->mddev
->external
)
2875 /* Must set offset before size, so overlap checks
2878 rdev
->data_offset
= offset
;
2879 rdev
->new_data_offset
= offset
;
2883 static struct rdev_sysfs_entry rdev_offset
=
2884 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2886 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2888 return sprintf(page
, "%llu\n",
2889 (unsigned long long)rdev
->new_data_offset
);
2892 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2893 const char *buf
, size_t len
)
2895 unsigned long long new_offset
;
2896 struct mddev
*mddev
= rdev
->mddev
;
2898 if (strict_strtoull(buf
, 10, &new_offset
) < 0)
2901 if (mddev
->sync_thread
)
2903 if (new_offset
== rdev
->data_offset
)
2904 /* reset is always permitted */
2906 else if (new_offset
> rdev
->data_offset
) {
2907 /* must not push array size beyond rdev_sectors */
2908 if (new_offset
- rdev
->data_offset
2909 + mddev
->dev_sectors
> rdev
->sectors
)
2912 /* Metadata worries about other space details. */
2914 /* decreasing the offset is inconsistent with a backwards
2917 if (new_offset
< rdev
->data_offset
&&
2918 mddev
->reshape_backwards
)
2920 /* Increasing offset is inconsistent with forwards
2921 * reshape. reshape_direction should be set to
2922 * 'backwards' first.
2924 if (new_offset
> rdev
->data_offset
&&
2925 !mddev
->reshape_backwards
)
2928 if (mddev
->pers
&& mddev
->persistent
&&
2929 !super_types
[mddev
->major_version
]
2930 .allow_new_offset(rdev
, new_offset
))
2932 rdev
->new_data_offset
= new_offset
;
2933 if (new_offset
> rdev
->data_offset
)
2934 mddev
->reshape_backwards
= 1;
2935 else if (new_offset
< rdev
->data_offset
)
2936 mddev
->reshape_backwards
= 0;
2940 static struct rdev_sysfs_entry rdev_new_offset
=
2941 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2944 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2946 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2949 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2951 /* check if two start/length pairs overlap */
2959 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2961 unsigned long long blocks
;
2964 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2967 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2968 return -EINVAL
; /* sector conversion overflow */
2971 if (new != blocks
* 2)
2972 return -EINVAL
; /* unsigned long long to sector_t overflow */
2979 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2981 struct mddev
*my_mddev
= rdev
->mddev
;
2982 sector_t oldsectors
= rdev
->sectors
;
2985 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2987 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2988 return -EINVAL
; /* too confusing */
2989 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2990 if (my_mddev
->persistent
) {
2991 sectors
= super_types
[my_mddev
->major_version
].
2992 rdev_size_change(rdev
, sectors
);
2995 } else if (!sectors
)
2996 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2999 if (sectors
< my_mddev
->dev_sectors
)
3000 return -EINVAL
; /* component must fit device */
3002 rdev
->sectors
= sectors
;
3003 if (sectors
> oldsectors
&& my_mddev
->external
) {
3004 /* need to check that all other rdevs with the same ->bdev
3005 * do not overlap. We need to unlock the mddev to avoid
3006 * a deadlock. We have already changed rdev->sectors, and if
3007 * we have to change it back, we will have the lock again.
3009 struct mddev
*mddev
;
3011 struct list_head
*tmp
;
3013 mddev_unlock(my_mddev
);
3014 for_each_mddev(mddev
, tmp
) {
3015 struct md_rdev
*rdev2
;
3018 rdev_for_each(rdev2
, mddev
)
3019 if (rdev
->bdev
== rdev2
->bdev
&&
3021 overlaps(rdev
->data_offset
, rdev
->sectors
,
3027 mddev_unlock(mddev
);
3033 mddev_lock(my_mddev
);
3035 /* Someone else could have slipped in a size
3036 * change here, but doing so is just silly.
3037 * We put oldsectors back because we *know* it is
3038 * safe, and trust userspace not to race with
3041 rdev
->sectors
= oldsectors
;
3048 static struct rdev_sysfs_entry rdev_size
=
3049 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3052 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3054 unsigned long long recovery_start
= rdev
->recovery_offset
;
3056 if (test_bit(In_sync
, &rdev
->flags
) ||
3057 recovery_start
== MaxSector
)
3058 return sprintf(page
, "none\n");
3060 return sprintf(page
, "%llu\n", recovery_start
);
3063 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3065 unsigned long long recovery_start
;
3067 if (cmd_match(buf
, "none"))
3068 recovery_start
= MaxSector
;
3069 else if (strict_strtoull(buf
, 10, &recovery_start
))
3072 if (rdev
->mddev
->pers
&&
3073 rdev
->raid_disk
>= 0)
3076 rdev
->recovery_offset
= recovery_start
;
3077 if (recovery_start
== MaxSector
)
3078 set_bit(In_sync
, &rdev
->flags
);
3080 clear_bit(In_sync
, &rdev
->flags
);
3084 static struct rdev_sysfs_entry rdev_recovery_start
=
3085 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3089 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3091 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3093 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3095 return badblocks_show(&rdev
->badblocks
, page
, 0);
3097 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3099 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3100 /* Maybe that ack was all we needed */
3101 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3102 wake_up(&rdev
->blocked_wait
);
3105 static struct rdev_sysfs_entry rdev_bad_blocks
=
3106 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3109 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3111 return badblocks_show(&rdev
->badblocks
, page
, 1);
3113 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3115 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3117 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3118 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3120 static struct attribute
*rdev_default_attrs
[] = {
3125 &rdev_new_offset
.attr
,
3127 &rdev_recovery_start
.attr
,
3128 &rdev_bad_blocks
.attr
,
3129 &rdev_unack_bad_blocks
.attr
,
3133 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3135 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3136 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3137 struct mddev
*mddev
= rdev
->mddev
;
3143 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3145 if (rdev
->mddev
== NULL
)
3148 rv
= entry
->show(rdev
, page
);
3149 mddev_unlock(mddev
);
3155 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3156 const char *page
, size_t length
)
3158 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3159 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3161 struct mddev
*mddev
= rdev
->mddev
;
3165 if (!capable(CAP_SYS_ADMIN
))
3167 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3169 if (rdev
->mddev
== NULL
)
3172 rv
= entry
->store(rdev
, page
, length
);
3173 mddev_unlock(mddev
);
3178 static void rdev_free(struct kobject
*ko
)
3180 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3183 static const struct sysfs_ops rdev_sysfs_ops
= {
3184 .show
= rdev_attr_show
,
3185 .store
= rdev_attr_store
,
3187 static struct kobj_type rdev_ktype
= {
3188 .release
= rdev_free
,
3189 .sysfs_ops
= &rdev_sysfs_ops
,
3190 .default_attrs
= rdev_default_attrs
,
3193 int md_rdev_init(struct md_rdev
*rdev
)
3196 rdev
->saved_raid_disk
= -1;
3197 rdev
->raid_disk
= -1;
3199 rdev
->data_offset
= 0;
3200 rdev
->new_data_offset
= 0;
3201 rdev
->sb_events
= 0;
3202 rdev
->last_read_error
.tv_sec
= 0;
3203 rdev
->last_read_error
.tv_nsec
= 0;
3204 rdev
->sb_loaded
= 0;
3205 rdev
->bb_page
= NULL
;
3206 atomic_set(&rdev
->nr_pending
, 0);
3207 atomic_set(&rdev
->read_errors
, 0);
3208 atomic_set(&rdev
->corrected_errors
, 0);
3210 INIT_LIST_HEAD(&rdev
->same_set
);
3211 init_waitqueue_head(&rdev
->blocked_wait
);
3213 /* Add space to store bad block list.
3214 * This reserves the space even on arrays where it cannot
3215 * be used - I wonder if that matters
3217 rdev
->badblocks
.count
= 0;
3218 rdev
->badblocks
.shift
= 0;
3219 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3220 seqlock_init(&rdev
->badblocks
.lock
);
3221 if (rdev
->badblocks
.page
== NULL
)
3226 EXPORT_SYMBOL_GPL(md_rdev_init
);
3228 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3230 * mark the device faulty if:
3232 * - the device is nonexistent (zero size)
3233 * - the device has no valid superblock
3235 * a faulty rdev _never_ has rdev->sb set.
3237 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3239 char b
[BDEVNAME_SIZE
];
3241 struct md_rdev
*rdev
;
3244 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3246 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3247 return ERR_PTR(-ENOMEM
);
3250 err
= md_rdev_init(rdev
);
3253 err
= alloc_disk_sb(rdev
);
3257 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3261 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3263 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3266 "md: %s has zero or unknown size, marking faulty!\n",
3267 bdevname(rdev
->bdev
,b
));
3272 if (super_format
>= 0) {
3273 err
= super_types
[super_format
].
3274 load_super(rdev
, NULL
, super_minor
);
3275 if (err
== -EINVAL
) {
3277 "md: %s does not have a valid v%d.%d "
3278 "superblock, not importing!\n",
3279 bdevname(rdev
->bdev
,b
),
3280 super_format
, super_minor
);
3285 "md: could not read %s's sb, not importing!\n",
3286 bdevname(rdev
->bdev
,b
));
3290 if (super_format
== -1)
3291 /* hot-add for 0.90, or non-persistent: so no badblocks */
3292 rdev
->badblocks
.shift
= -1;
3299 md_rdev_clear(rdev
);
3301 return ERR_PTR(err
);
3305 * Check a full RAID array for plausibility
3309 static void analyze_sbs(struct mddev
* mddev
)
3312 struct md_rdev
*rdev
, *freshest
, *tmp
;
3313 char b
[BDEVNAME_SIZE
];
3316 rdev_for_each_safe(rdev
, tmp
, mddev
)
3317 switch (super_types
[mddev
->major_version
].
3318 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3326 "md: fatal superblock inconsistency in %s"
3327 " -- removing from array\n",
3328 bdevname(rdev
->bdev
,b
));
3329 kick_rdev_from_array(rdev
);
3333 super_types
[mddev
->major_version
].
3334 validate_super(mddev
, freshest
);
3337 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3338 if (mddev
->max_disks
&&
3339 (rdev
->desc_nr
>= mddev
->max_disks
||
3340 i
> mddev
->max_disks
)) {
3342 "md: %s: %s: only %d devices permitted\n",
3343 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3345 kick_rdev_from_array(rdev
);
3348 if (rdev
!= freshest
)
3349 if (super_types
[mddev
->major_version
].
3350 validate_super(mddev
, rdev
)) {
3351 printk(KERN_WARNING
"md: kicking non-fresh %s"
3353 bdevname(rdev
->bdev
,b
));
3354 kick_rdev_from_array(rdev
);
3357 if (mddev
->level
== LEVEL_MULTIPATH
) {
3358 rdev
->desc_nr
= i
++;
3359 rdev
->raid_disk
= rdev
->desc_nr
;
3360 set_bit(In_sync
, &rdev
->flags
);
3361 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3362 rdev
->raid_disk
= -1;
3363 clear_bit(In_sync
, &rdev
->flags
);
3368 /* Read a fixed-point number.
3369 * Numbers in sysfs attributes should be in "standard" units where
3370 * possible, so time should be in seconds.
3371 * However we internally use a a much smaller unit such as
3372 * milliseconds or jiffies.
3373 * This function takes a decimal number with a possible fractional
3374 * component, and produces an integer which is the result of
3375 * multiplying that number by 10^'scale'.
3376 * all without any floating-point arithmetic.
3378 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3380 unsigned long result
= 0;
3382 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3385 else if (decimals
< scale
) {
3388 result
= result
* 10 + value
;
3400 while (decimals
< scale
) {
3409 static void md_safemode_timeout(unsigned long data
);
3412 safe_delay_show(struct mddev
*mddev
, char *page
)
3414 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3415 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3418 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3422 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3425 mddev
->safemode_delay
= 0;
3427 unsigned long old_delay
= mddev
->safemode_delay
;
3428 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3429 if (mddev
->safemode_delay
== 0)
3430 mddev
->safemode_delay
= 1;
3431 if (mddev
->safemode_delay
< old_delay
)
3432 md_safemode_timeout((unsigned long)mddev
);
3436 static struct md_sysfs_entry md_safe_delay
=
3437 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3440 level_show(struct mddev
*mddev
, char *page
)
3442 struct md_personality
*p
= mddev
->pers
;
3444 return sprintf(page
, "%s\n", p
->name
);
3445 else if (mddev
->clevel
[0])
3446 return sprintf(page
, "%s\n", mddev
->clevel
);
3447 else if (mddev
->level
!= LEVEL_NONE
)
3448 return sprintf(page
, "%d\n", mddev
->level
);
3454 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3458 struct md_personality
*pers
;
3461 struct md_rdev
*rdev
;
3463 if (mddev
->pers
== NULL
) {
3466 if (len
>= sizeof(mddev
->clevel
))
3468 strncpy(mddev
->clevel
, buf
, len
);
3469 if (mddev
->clevel
[len
-1] == '\n')
3471 mddev
->clevel
[len
] = 0;
3472 mddev
->level
= LEVEL_NONE
;
3476 /* request to change the personality. Need to ensure:
3477 * - array is not engaged in resync/recovery/reshape
3478 * - old personality can be suspended
3479 * - new personality will access other array.
3482 if (mddev
->sync_thread
||
3483 mddev
->reshape_position
!= MaxSector
||
3484 mddev
->sysfs_active
)
3487 if (!mddev
->pers
->quiesce
) {
3488 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3489 mdname(mddev
), mddev
->pers
->name
);
3493 /* Now find the new personality */
3494 if (len
== 0 || len
>= sizeof(clevel
))
3496 strncpy(clevel
, buf
, len
);
3497 if (clevel
[len
-1] == '\n')
3500 if (strict_strtol(clevel
, 10, &level
))
3503 if (request_module("md-%s", clevel
) != 0)
3504 request_module("md-level-%s", clevel
);
3505 spin_lock(&pers_lock
);
3506 pers
= find_pers(level
, clevel
);
3507 if (!pers
|| !try_module_get(pers
->owner
)) {
3508 spin_unlock(&pers_lock
);
3509 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3512 spin_unlock(&pers_lock
);
3514 if (pers
== mddev
->pers
) {
3515 /* Nothing to do! */
3516 module_put(pers
->owner
);
3519 if (!pers
->takeover
) {
3520 module_put(pers
->owner
);
3521 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3522 mdname(mddev
), clevel
);
3526 rdev_for_each(rdev
, mddev
)
3527 rdev
->new_raid_disk
= rdev
->raid_disk
;
3529 /* ->takeover must set new_* and/or delta_disks
3530 * if it succeeds, and may set them when it fails.
3532 priv
= pers
->takeover(mddev
);
3534 mddev
->new_level
= mddev
->level
;
3535 mddev
->new_layout
= mddev
->layout
;
3536 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3537 mddev
->raid_disks
-= mddev
->delta_disks
;
3538 mddev
->delta_disks
= 0;
3539 mddev
->reshape_backwards
= 0;
3540 module_put(pers
->owner
);
3541 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3542 mdname(mddev
), clevel
);
3543 return PTR_ERR(priv
);
3546 /* Looks like we have a winner */
3547 mddev_suspend(mddev
);
3548 mddev
->pers
->stop(mddev
);
3550 if (mddev
->pers
->sync_request
== NULL
&&
3551 pers
->sync_request
!= NULL
) {
3552 /* need to add the md_redundancy_group */
3553 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3555 "md: cannot register extra attributes for %s\n",
3557 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3559 if (mddev
->pers
->sync_request
!= NULL
&&
3560 pers
->sync_request
== NULL
) {
3561 /* need to remove the md_redundancy_group */
3562 if (mddev
->to_remove
== NULL
)
3563 mddev
->to_remove
= &md_redundancy_group
;
3566 if (mddev
->pers
->sync_request
== NULL
&&
3568 /* We are converting from a no-redundancy array
3569 * to a redundancy array and metadata is managed
3570 * externally so we need to be sure that writes
3571 * won't block due to a need to transition
3573 * until external management is started.
3576 mddev
->safemode_delay
= 0;
3577 mddev
->safemode
= 0;
3580 rdev_for_each(rdev
, mddev
) {
3581 if (rdev
->raid_disk
< 0)
3583 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3584 rdev
->new_raid_disk
= -1;
3585 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3587 sysfs_unlink_rdev(mddev
, rdev
);
3589 rdev_for_each(rdev
, mddev
) {
3590 if (rdev
->raid_disk
< 0)
3592 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3594 rdev
->raid_disk
= rdev
->new_raid_disk
;
3595 if (rdev
->raid_disk
< 0)
3596 clear_bit(In_sync
, &rdev
->flags
);
3598 if (sysfs_link_rdev(mddev
, rdev
))
3599 printk(KERN_WARNING
"md: cannot register rd%d"
3600 " for %s after level change\n",
3601 rdev
->raid_disk
, mdname(mddev
));
3605 module_put(mddev
->pers
->owner
);
3607 mddev
->private = priv
;
3608 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3609 mddev
->level
= mddev
->new_level
;
3610 mddev
->layout
= mddev
->new_layout
;
3611 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3612 mddev
->delta_disks
= 0;
3613 mddev
->reshape_backwards
= 0;
3614 mddev
->degraded
= 0;
3615 if (mddev
->pers
->sync_request
== NULL
) {
3616 /* this is now an array without redundancy, so
3617 * it must always be in_sync
3620 del_timer_sync(&mddev
->safemode_timer
);
3623 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3624 mddev_resume(mddev
);
3625 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3626 md_new_event(mddev
);
3630 static struct md_sysfs_entry md_level
=
3631 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3635 layout_show(struct mddev
*mddev
, char *page
)
3637 /* just a number, not meaningful for all levels */
3638 if (mddev
->reshape_position
!= MaxSector
&&
3639 mddev
->layout
!= mddev
->new_layout
)
3640 return sprintf(page
, "%d (%d)\n",
3641 mddev
->new_layout
, mddev
->layout
);
3642 return sprintf(page
, "%d\n", mddev
->layout
);
3646 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3649 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3651 if (!*buf
|| (*e
&& *e
!= '\n'))
3656 if (mddev
->pers
->check_reshape
== NULL
)
3658 mddev
->new_layout
= n
;
3659 err
= mddev
->pers
->check_reshape(mddev
);
3661 mddev
->new_layout
= mddev
->layout
;
3665 mddev
->new_layout
= n
;
3666 if (mddev
->reshape_position
== MaxSector
)
3671 static struct md_sysfs_entry md_layout
=
3672 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3676 raid_disks_show(struct mddev
*mddev
, char *page
)
3678 if (mddev
->raid_disks
== 0)
3680 if (mddev
->reshape_position
!= MaxSector
&&
3681 mddev
->delta_disks
!= 0)
3682 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3683 mddev
->raid_disks
- mddev
->delta_disks
);
3684 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3687 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3690 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3694 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3696 if (!*buf
|| (*e
&& *e
!= '\n'))
3700 rv
= update_raid_disks(mddev
, n
);
3701 else if (mddev
->reshape_position
!= MaxSector
) {
3702 struct md_rdev
*rdev
;
3703 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3705 rdev_for_each(rdev
, mddev
) {
3707 rdev
->data_offset
< rdev
->new_data_offset
)
3710 rdev
->data_offset
> rdev
->new_data_offset
)
3713 mddev
->delta_disks
= n
- olddisks
;
3714 mddev
->raid_disks
= n
;
3715 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3717 mddev
->raid_disks
= n
;
3718 return rv
? rv
: len
;
3720 static struct md_sysfs_entry md_raid_disks
=
3721 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3724 chunk_size_show(struct mddev
*mddev
, char *page
)
3726 if (mddev
->reshape_position
!= MaxSector
&&
3727 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3728 return sprintf(page
, "%d (%d)\n",
3729 mddev
->new_chunk_sectors
<< 9,
3730 mddev
->chunk_sectors
<< 9);
3731 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3735 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3738 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3740 if (!*buf
|| (*e
&& *e
!= '\n'))
3745 if (mddev
->pers
->check_reshape
== NULL
)
3747 mddev
->new_chunk_sectors
= n
>> 9;
3748 err
= mddev
->pers
->check_reshape(mddev
);
3750 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3754 mddev
->new_chunk_sectors
= n
>> 9;
3755 if (mddev
->reshape_position
== MaxSector
)
3756 mddev
->chunk_sectors
= n
>> 9;
3760 static struct md_sysfs_entry md_chunk_size
=
3761 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3764 resync_start_show(struct mddev
*mddev
, char *page
)
3766 if (mddev
->recovery_cp
== MaxSector
)
3767 return sprintf(page
, "none\n");
3768 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3772 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3775 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3777 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3779 if (cmd_match(buf
, "none"))
3781 else if (!*buf
|| (*e
&& *e
!= '\n'))
3784 mddev
->recovery_cp
= n
;
3787 static struct md_sysfs_entry md_resync_start
=
3788 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3791 * The array state can be:
3794 * No devices, no size, no level
3795 * Equivalent to STOP_ARRAY ioctl
3797 * May have some settings, but array is not active
3798 * all IO results in error
3799 * When written, doesn't tear down array, but just stops it
3800 * suspended (not supported yet)
3801 * All IO requests will block. The array can be reconfigured.
3802 * Writing this, if accepted, will block until array is quiescent
3804 * no resync can happen. no superblocks get written.
3805 * write requests fail
3807 * like readonly, but behaves like 'clean' on a write request.
3809 * clean - no pending writes, but otherwise active.
3810 * When written to inactive array, starts without resync
3811 * If a write request arrives then
3812 * if metadata is known, mark 'dirty' and switch to 'active'.
3813 * if not known, block and switch to write-pending
3814 * If written to an active array that has pending writes, then fails.
3816 * fully active: IO and resync can be happening.
3817 * When written to inactive array, starts with resync
3820 * clean, but writes are blocked waiting for 'active' to be written.
3823 * like active, but no writes have been seen for a while (100msec).
3826 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3827 write_pending
, active_idle
, bad_word
};
3828 static char *array_states
[] = {
3829 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3830 "write-pending", "active-idle", NULL
};
3832 static int match_word(const char *word
, char **list
)
3835 for (n
=0; list
[n
]; n
++)
3836 if (cmd_match(word
, list
[n
]))
3842 array_state_show(struct mddev
*mddev
, char *page
)
3844 enum array_state st
= inactive
;
3857 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3859 else if (mddev
->safemode
)
3865 if (list_empty(&mddev
->disks
) &&
3866 mddev
->raid_disks
== 0 &&
3867 mddev
->dev_sectors
== 0)
3872 return sprintf(page
, "%s\n", array_states
[st
]);
3875 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3876 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3877 static int do_md_run(struct mddev
* mddev
);
3878 static int restart_array(struct mddev
*mddev
);
3881 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3884 enum array_state st
= match_word(buf
, array_states
);
3889 /* stopping an active array */
3890 err
= do_md_stop(mddev
, 0, NULL
);
3893 /* stopping an active array */
3895 err
= do_md_stop(mddev
, 2, NULL
);
3897 err
= 0; /* already inactive */
3900 break; /* not supported yet */
3903 err
= md_set_readonly(mddev
, NULL
);
3906 set_disk_ro(mddev
->gendisk
, 1);
3907 err
= do_md_run(mddev
);
3913 err
= md_set_readonly(mddev
, NULL
);
3914 else if (mddev
->ro
== 1)
3915 err
= restart_array(mddev
);
3918 set_disk_ro(mddev
->gendisk
, 0);
3922 err
= do_md_run(mddev
);
3927 restart_array(mddev
);
3928 spin_lock_irq(&mddev
->write_lock
);
3929 if (atomic_read(&mddev
->writes_pending
) == 0) {
3930 if (mddev
->in_sync
== 0) {
3932 if (mddev
->safemode
== 1)
3933 mddev
->safemode
= 0;
3934 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3939 spin_unlock_irq(&mddev
->write_lock
);
3945 restart_array(mddev
);
3946 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3947 wake_up(&mddev
->sb_wait
);
3951 set_disk_ro(mddev
->gendisk
, 0);
3952 err
= do_md_run(mddev
);
3957 /* these cannot be set */
3963 if (mddev
->hold_active
== UNTIL_IOCTL
)
3964 mddev
->hold_active
= 0;
3965 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3969 static struct md_sysfs_entry md_array_state
=
3970 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3973 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3974 return sprintf(page
, "%d\n",
3975 atomic_read(&mddev
->max_corr_read_errors
));
3979 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3982 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3984 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3985 atomic_set(&mddev
->max_corr_read_errors
, n
);
3991 static struct md_sysfs_entry max_corr_read_errors
=
3992 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3993 max_corrected_read_errors_store
);
3996 null_show(struct mddev
*mddev
, char *page
)
4002 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4004 /* buf must be %d:%d\n? giving major and minor numbers */
4005 /* The new device is added to the array.
4006 * If the array has a persistent superblock, we read the
4007 * superblock to initialise info and check validity.
4008 * Otherwise, only checking done is that in bind_rdev_to_array,
4009 * which mainly checks size.
4012 int major
= simple_strtoul(buf
, &e
, 10);
4015 struct md_rdev
*rdev
;
4018 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4020 minor
= simple_strtoul(e
+1, &e
, 10);
4021 if (*e
&& *e
!= '\n')
4023 dev
= MKDEV(major
, minor
);
4024 if (major
!= MAJOR(dev
) ||
4025 minor
!= MINOR(dev
))
4029 if (mddev
->persistent
) {
4030 rdev
= md_import_device(dev
, mddev
->major_version
,
4031 mddev
->minor_version
);
4032 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4033 struct md_rdev
*rdev0
4034 = list_entry(mddev
->disks
.next
,
4035 struct md_rdev
, same_set
);
4036 err
= super_types
[mddev
->major_version
]
4037 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4041 } else if (mddev
->external
)
4042 rdev
= md_import_device(dev
, -2, -1);
4044 rdev
= md_import_device(dev
, -1, -1);
4047 return PTR_ERR(rdev
);
4048 err
= bind_rdev_to_array(rdev
, mddev
);
4052 return err
? err
: len
;
4055 static struct md_sysfs_entry md_new_device
=
4056 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4059 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4062 unsigned long chunk
, end_chunk
;
4066 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4068 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4069 if (buf
== end
) break;
4070 if (*end
== '-') { /* range */
4072 end_chunk
= simple_strtoul(buf
, &end
, 0);
4073 if (buf
== end
) break;
4075 if (*end
&& !isspace(*end
)) break;
4076 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4077 buf
= skip_spaces(end
);
4079 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4084 static struct md_sysfs_entry md_bitmap
=
4085 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4088 size_show(struct mddev
*mddev
, char *page
)
4090 return sprintf(page
, "%llu\n",
4091 (unsigned long long)mddev
->dev_sectors
/ 2);
4094 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4097 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4099 /* If array is inactive, we can reduce the component size, but
4100 * not increase it (except from 0).
4101 * If array is active, we can try an on-line resize
4104 int err
= strict_blocks_to_sectors(buf
, §ors
);
4109 err
= update_size(mddev
, sectors
);
4110 md_update_sb(mddev
, 1);
4112 if (mddev
->dev_sectors
== 0 ||
4113 mddev
->dev_sectors
> sectors
)
4114 mddev
->dev_sectors
= sectors
;
4118 return err
? err
: len
;
4121 static struct md_sysfs_entry md_size
=
4122 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4127 * 'none' for arrays with no metadata (good luck...)
4128 * 'external' for arrays with externally managed metadata,
4129 * or N.M for internally known formats
4132 metadata_show(struct mddev
*mddev
, char *page
)
4134 if (mddev
->persistent
)
4135 return sprintf(page
, "%d.%d\n",
4136 mddev
->major_version
, mddev
->minor_version
);
4137 else if (mddev
->external
)
4138 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4140 return sprintf(page
, "none\n");
4144 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4148 /* Changing the details of 'external' metadata is
4149 * always permitted. Otherwise there must be
4150 * no devices attached to the array.
4152 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4154 else if (!list_empty(&mddev
->disks
))
4157 if (cmd_match(buf
, "none")) {
4158 mddev
->persistent
= 0;
4159 mddev
->external
= 0;
4160 mddev
->major_version
= 0;
4161 mddev
->minor_version
= 90;
4164 if (strncmp(buf
, "external:", 9) == 0) {
4165 size_t namelen
= len
-9;
4166 if (namelen
>= sizeof(mddev
->metadata_type
))
4167 namelen
= sizeof(mddev
->metadata_type
)-1;
4168 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4169 mddev
->metadata_type
[namelen
] = 0;
4170 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4171 mddev
->metadata_type
[--namelen
] = 0;
4172 mddev
->persistent
= 0;
4173 mddev
->external
= 1;
4174 mddev
->major_version
= 0;
4175 mddev
->minor_version
= 90;
4178 major
= simple_strtoul(buf
, &e
, 10);
4179 if (e
==buf
|| *e
!= '.')
4182 minor
= simple_strtoul(buf
, &e
, 10);
4183 if (e
==buf
|| (*e
&& *e
!= '\n') )
4185 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4187 mddev
->major_version
= major
;
4188 mddev
->minor_version
= minor
;
4189 mddev
->persistent
= 1;
4190 mddev
->external
= 0;
4194 static struct md_sysfs_entry md_metadata
=
4195 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4198 action_show(struct mddev
*mddev
, char *page
)
4200 char *type
= "idle";
4201 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4203 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4204 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4205 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4207 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4208 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4210 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4214 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4217 return sprintf(page
, "%s\n", type
);
4220 static void reap_sync_thread(struct mddev
*mddev
);
4223 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4225 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4228 if (cmd_match(page
, "frozen"))
4229 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4231 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4233 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4234 if (mddev
->sync_thread
) {
4235 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4236 reap_sync_thread(mddev
);
4238 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4239 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4241 else if (cmd_match(page
, "resync"))
4242 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4243 else if (cmd_match(page
, "recover")) {
4244 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4245 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4246 } else if (cmd_match(page
, "reshape")) {
4248 if (mddev
->pers
->start_reshape
== NULL
)
4250 err
= mddev
->pers
->start_reshape(mddev
);
4253 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4255 if (cmd_match(page
, "check"))
4256 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4257 else if (!cmd_match(page
, "repair"))
4259 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4260 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4262 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4263 md_wakeup_thread(mddev
->thread
);
4264 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4269 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4271 return sprintf(page
, "%llu\n",
4272 (unsigned long long)
4273 atomic64_read(&mddev
->resync_mismatches
));
4276 static struct md_sysfs_entry md_scan_mode
=
4277 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4280 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4283 sync_min_show(struct mddev
*mddev
, char *page
)
4285 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4286 mddev
->sync_speed_min
? "local": "system");
4290 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4294 if (strncmp(buf
, "system", 6)==0) {
4295 mddev
->sync_speed_min
= 0;
4298 min
= simple_strtoul(buf
, &e
, 10);
4299 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4301 mddev
->sync_speed_min
= min
;
4305 static struct md_sysfs_entry md_sync_min
=
4306 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4309 sync_max_show(struct mddev
*mddev
, char *page
)
4311 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4312 mddev
->sync_speed_max
? "local": "system");
4316 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4320 if (strncmp(buf
, "system", 6)==0) {
4321 mddev
->sync_speed_max
= 0;
4324 max
= simple_strtoul(buf
, &e
, 10);
4325 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4327 mddev
->sync_speed_max
= max
;
4331 static struct md_sysfs_entry md_sync_max
=
4332 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4335 degraded_show(struct mddev
*mddev
, char *page
)
4337 return sprintf(page
, "%d\n", mddev
->degraded
);
4339 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4342 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4344 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4348 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4352 if (strict_strtol(buf
, 10, &n
))
4355 if (n
!= 0 && n
!= 1)
4358 mddev
->parallel_resync
= n
;
4360 if (mddev
->sync_thread
)
4361 wake_up(&resync_wait
);
4366 /* force parallel resync, even with shared block devices */
4367 static struct md_sysfs_entry md_sync_force_parallel
=
4368 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4369 sync_force_parallel_show
, sync_force_parallel_store
);
4372 sync_speed_show(struct mddev
*mddev
, char *page
)
4374 unsigned long resync
, dt
, db
;
4375 if (mddev
->curr_resync
== 0)
4376 return sprintf(page
, "none\n");
4377 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4378 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4380 db
= resync
- mddev
->resync_mark_cnt
;
4381 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4384 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4387 sync_completed_show(struct mddev
*mddev
, char *page
)
4389 unsigned long long max_sectors
, resync
;
4391 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4392 return sprintf(page
, "none\n");
4394 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4395 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4396 max_sectors
= mddev
->resync_max_sectors
;
4398 max_sectors
= mddev
->dev_sectors
;
4400 resync
= mddev
->curr_resync_completed
;
4401 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4404 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4407 min_sync_show(struct mddev
*mddev
, char *page
)
4409 return sprintf(page
, "%llu\n",
4410 (unsigned long long)mddev
->resync_min
);
4413 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4415 unsigned long long min
;
4416 if (strict_strtoull(buf
, 10, &min
))
4418 if (min
> mddev
->resync_max
)
4420 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4423 /* Must be a multiple of chunk_size */
4424 if (mddev
->chunk_sectors
) {
4425 sector_t temp
= min
;
4426 if (sector_div(temp
, mddev
->chunk_sectors
))
4429 mddev
->resync_min
= min
;
4434 static struct md_sysfs_entry md_min_sync
=
4435 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4438 max_sync_show(struct mddev
*mddev
, char *page
)
4440 if (mddev
->resync_max
== MaxSector
)
4441 return sprintf(page
, "max\n");
4443 return sprintf(page
, "%llu\n",
4444 (unsigned long long)mddev
->resync_max
);
4447 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4449 if (strncmp(buf
, "max", 3) == 0)
4450 mddev
->resync_max
= MaxSector
;
4452 unsigned long long max
;
4453 if (strict_strtoull(buf
, 10, &max
))
4455 if (max
< mddev
->resync_min
)
4457 if (max
< mddev
->resync_max
&&
4459 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4462 /* Must be a multiple of chunk_size */
4463 if (mddev
->chunk_sectors
) {
4464 sector_t temp
= max
;
4465 if (sector_div(temp
, mddev
->chunk_sectors
))
4468 mddev
->resync_max
= max
;
4470 wake_up(&mddev
->recovery_wait
);
4474 static struct md_sysfs_entry md_max_sync
=
4475 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4478 suspend_lo_show(struct mddev
*mddev
, char *page
)
4480 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4484 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4487 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4488 unsigned long long old
= mddev
->suspend_lo
;
4490 if (mddev
->pers
== NULL
||
4491 mddev
->pers
->quiesce
== NULL
)
4493 if (buf
== e
|| (*e
&& *e
!= '\n'))
4496 mddev
->suspend_lo
= new;
4498 /* Shrinking suspended region */
4499 mddev
->pers
->quiesce(mddev
, 2);
4501 /* Expanding suspended region - need to wait */
4502 mddev
->pers
->quiesce(mddev
, 1);
4503 mddev
->pers
->quiesce(mddev
, 0);
4507 static struct md_sysfs_entry md_suspend_lo
=
4508 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4512 suspend_hi_show(struct mddev
*mddev
, char *page
)
4514 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4518 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4521 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4522 unsigned long long old
= mddev
->suspend_hi
;
4524 if (mddev
->pers
== NULL
||
4525 mddev
->pers
->quiesce
== NULL
)
4527 if (buf
== e
|| (*e
&& *e
!= '\n'))
4530 mddev
->suspend_hi
= new;
4532 /* Shrinking suspended region */
4533 mddev
->pers
->quiesce(mddev
, 2);
4535 /* Expanding suspended region - need to wait */
4536 mddev
->pers
->quiesce(mddev
, 1);
4537 mddev
->pers
->quiesce(mddev
, 0);
4541 static struct md_sysfs_entry md_suspend_hi
=
4542 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4545 reshape_position_show(struct mddev
*mddev
, char *page
)
4547 if (mddev
->reshape_position
!= MaxSector
)
4548 return sprintf(page
, "%llu\n",
4549 (unsigned long long)mddev
->reshape_position
);
4550 strcpy(page
, "none\n");
4555 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4557 struct md_rdev
*rdev
;
4559 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4562 if (buf
== e
|| (*e
&& *e
!= '\n'))
4564 mddev
->reshape_position
= new;
4565 mddev
->delta_disks
= 0;
4566 mddev
->reshape_backwards
= 0;
4567 mddev
->new_level
= mddev
->level
;
4568 mddev
->new_layout
= mddev
->layout
;
4569 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4570 rdev_for_each(rdev
, mddev
)
4571 rdev
->new_data_offset
= rdev
->data_offset
;
4575 static struct md_sysfs_entry md_reshape_position
=
4576 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4577 reshape_position_store
);
4580 reshape_direction_show(struct mddev
*mddev
, char *page
)
4582 return sprintf(page
, "%s\n",
4583 mddev
->reshape_backwards
? "backwards" : "forwards");
4587 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4590 if (cmd_match(buf
, "forwards"))
4592 else if (cmd_match(buf
, "backwards"))
4596 if (mddev
->reshape_backwards
== backwards
)
4599 /* check if we are allowed to change */
4600 if (mddev
->delta_disks
)
4603 if (mddev
->persistent
&&
4604 mddev
->major_version
== 0)
4607 mddev
->reshape_backwards
= backwards
;
4611 static struct md_sysfs_entry md_reshape_direction
=
4612 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4613 reshape_direction_store
);
4616 array_size_show(struct mddev
*mddev
, char *page
)
4618 if (mddev
->external_size
)
4619 return sprintf(page
, "%llu\n",
4620 (unsigned long long)mddev
->array_sectors
/2);
4622 return sprintf(page
, "default\n");
4626 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4630 if (strncmp(buf
, "default", 7) == 0) {
4632 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4634 sectors
= mddev
->array_sectors
;
4636 mddev
->external_size
= 0;
4638 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4640 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4643 mddev
->external_size
= 1;
4646 mddev
->array_sectors
= sectors
;
4648 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4649 revalidate_disk(mddev
->gendisk
);
4654 static struct md_sysfs_entry md_array_size
=
4655 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4658 static struct attribute
*md_default_attrs
[] = {
4661 &md_raid_disks
.attr
,
4662 &md_chunk_size
.attr
,
4664 &md_resync_start
.attr
,
4666 &md_new_device
.attr
,
4667 &md_safe_delay
.attr
,
4668 &md_array_state
.attr
,
4669 &md_reshape_position
.attr
,
4670 &md_reshape_direction
.attr
,
4671 &md_array_size
.attr
,
4672 &max_corr_read_errors
.attr
,
4676 static struct attribute
*md_redundancy_attrs
[] = {
4678 &md_mismatches
.attr
,
4681 &md_sync_speed
.attr
,
4682 &md_sync_force_parallel
.attr
,
4683 &md_sync_completed
.attr
,
4686 &md_suspend_lo
.attr
,
4687 &md_suspend_hi
.attr
,
4692 static struct attribute_group md_redundancy_group
= {
4694 .attrs
= md_redundancy_attrs
,
4699 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4701 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4702 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4707 spin_lock(&all_mddevs_lock
);
4708 if (list_empty(&mddev
->all_mddevs
)) {
4709 spin_unlock(&all_mddevs_lock
);
4713 spin_unlock(&all_mddevs_lock
);
4715 rv
= mddev_lock(mddev
);
4717 rv
= entry
->show(mddev
, page
);
4718 mddev_unlock(mddev
);
4725 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4726 const char *page
, size_t length
)
4728 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4729 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4734 if (!capable(CAP_SYS_ADMIN
))
4736 spin_lock(&all_mddevs_lock
);
4737 if (list_empty(&mddev
->all_mddevs
)) {
4738 spin_unlock(&all_mddevs_lock
);
4742 spin_unlock(&all_mddevs_lock
);
4743 rv
= mddev_lock(mddev
);
4745 rv
= entry
->store(mddev
, page
, length
);
4746 mddev_unlock(mddev
);
4752 static void md_free(struct kobject
*ko
)
4754 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4756 if (mddev
->sysfs_state
)
4757 sysfs_put(mddev
->sysfs_state
);
4759 if (mddev
->gendisk
) {
4760 del_gendisk(mddev
->gendisk
);
4761 put_disk(mddev
->gendisk
);
4764 blk_cleanup_queue(mddev
->queue
);
4769 static const struct sysfs_ops md_sysfs_ops
= {
4770 .show
= md_attr_show
,
4771 .store
= md_attr_store
,
4773 static struct kobj_type md_ktype
= {
4775 .sysfs_ops
= &md_sysfs_ops
,
4776 .default_attrs
= md_default_attrs
,
4781 static void mddev_delayed_delete(struct work_struct
*ws
)
4783 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4785 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4786 kobject_del(&mddev
->kobj
);
4787 kobject_put(&mddev
->kobj
);
4790 static int md_alloc(dev_t dev
, char *name
)
4792 static DEFINE_MUTEX(disks_mutex
);
4793 struct mddev
*mddev
= mddev_find(dev
);
4794 struct gendisk
*disk
;
4803 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4804 shift
= partitioned
? MdpMinorShift
: 0;
4805 unit
= MINOR(mddev
->unit
) >> shift
;
4807 /* wait for any previous instance of this device to be
4808 * completely removed (mddev_delayed_delete).
4810 flush_workqueue(md_misc_wq
);
4812 mutex_lock(&disks_mutex
);
4818 /* Need to ensure that 'name' is not a duplicate.
4820 struct mddev
*mddev2
;
4821 spin_lock(&all_mddevs_lock
);
4823 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4824 if (mddev2
->gendisk
&&
4825 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4826 spin_unlock(&all_mddevs_lock
);
4829 spin_unlock(&all_mddevs_lock
);
4833 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4836 mddev
->queue
->queuedata
= mddev
;
4838 blk_queue_make_request(mddev
->queue
, md_make_request
);
4839 blk_set_stacking_limits(&mddev
->queue
->limits
);
4841 disk
= alloc_disk(1 << shift
);
4843 blk_cleanup_queue(mddev
->queue
);
4844 mddev
->queue
= NULL
;
4847 disk
->major
= MAJOR(mddev
->unit
);
4848 disk
->first_minor
= unit
<< shift
;
4850 strcpy(disk
->disk_name
, name
);
4851 else if (partitioned
)
4852 sprintf(disk
->disk_name
, "md_d%d", unit
);
4854 sprintf(disk
->disk_name
, "md%d", unit
);
4855 disk
->fops
= &md_fops
;
4856 disk
->private_data
= mddev
;
4857 disk
->queue
= mddev
->queue
;
4858 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4859 /* Allow extended partitions. This makes the
4860 * 'mdp' device redundant, but we can't really
4863 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4864 mddev
->gendisk
= disk
;
4865 /* As soon as we call add_disk(), another thread could get
4866 * through to md_open, so make sure it doesn't get too far
4868 mutex_lock(&mddev
->open_mutex
);
4871 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4872 &disk_to_dev(disk
)->kobj
, "%s", "md");
4874 /* This isn't possible, but as kobject_init_and_add is marked
4875 * __must_check, we must do something with the result
4877 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4881 if (mddev
->kobj
.sd
&&
4882 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4883 printk(KERN_DEBUG
"pointless warning\n");
4884 mutex_unlock(&mddev
->open_mutex
);
4886 mutex_unlock(&disks_mutex
);
4887 if (!error
&& mddev
->kobj
.sd
) {
4888 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4889 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4895 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4897 md_alloc(dev
, NULL
);
4901 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4903 /* val must be "md_*" where * is not all digits.
4904 * We allocate an array with a large free minor number, and
4905 * set the name to val. val must not already be an active name.
4907 int len
= strlen(val
);
4908 char buf
[DISK_NAME_LEN
];
4910 while (len
&& val
[len
-1] == '\n')
4912 if (len
>= DISK_NAME_LEN
)
4914 strlcpy(buf
, val
, len
+1);
4915 if (strncmp(buf
, "md_", 3) != 0)
4917 return md_alloc(0, buf
);
4920 static void md_safemode_timeout(unsigned long data
)
4922 struct mddev
*mddev
= (struct mddev
*) data
;
4924 if (!atomic_read(&mddev
->writes_pending
)) {
4925 mddev
->safemode
= 1;
4926 if (mddev
->external
)
4927 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4929 md_wakeup_thread(mddev
->thread
);
4932 static int start_dirty_degraded
;
4934 int md_run(struct mddev
*mddev
)
4937 struct md_rdev
*rdev
;
4938 struct md_personality
*pers
;
4940 if (list_empty(&mddev
->disks
))
4941 /* cannot run an array with no devices.. */
4946 /* Cannot run until previous stop completes properly */
4947 if (mddev
->sysfs_active
)
4951 * Analyze all RAID superblock(s)
4953 if (!mddev
->raid_disks
) {
4954 if (!mddev
->persistent
)
4959 if (mddev
->level
!= LEVEL_NONE
)
4960 request_module("md-level-%d", mddev
->level
);
4961 else if (mddev
->clevel
[0])
4962 request_module("md-%s", mddev
->clevel
);
4965 * Drop all container device buffers, from now on
4966 * the only valid external interface is through the md
4969 rdev_for_each(rdev
, mddev
) {
4970 if (test_bit(Faulty
, &rdev
->flags
))
4972 sync_blockdev(rdev
->bdev
);
4973 invalidate_bdev(rdev
->bdev
);
4975 /* perform some consistency tests on the device.
4976 * We don't want the data to overlap the metadata,
4977 * Internal Bitmap issues have been handled elsewhere.
4979 if (rdev
->meta_bdev
) {
4980 /* Nothing to check */;
4981 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4982 if (mddev
->dev_sectors
&&
4983 rdev
->data_offset
+ mddev
->dev_sectors
4985 printk("md: %s: data overlaps metadata\n",
4990 if (rdev
->sb_start
+ rdev
->sb_size
/512
4991 > rdev
->data_offset
) {
4992 printk("md: %s: metadata overlaps data\n",
4997 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5000 if (mddev
->bio_set
== NULL
)
5001 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5003 spin_lock(&pers_lock
);
5004 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5005 if (!pers
|| !try_module_get(pers
->owner
)) {
5006 spin_unlock(&pers_lock
);
5007 if (mddev
->level
!= LEVEL_NONE
)
5008 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5011 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5016 spin_unlock(&pers_lock
);
5017 if (mddev
->level
!= pers
->level
) {
5018 mddev
->level
= pers
->level
;
5019 mddev
->new_level
= pers
->level
;
5021 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5023 if (mddev
->reshape_position
!= MaxSector
&&
5024 pers
->start_reshape
== NULL
) {
5025 /* This personality cannot handle reshaping... */
5027 module_put(pers
->owner
);
5031 if (pers
->sync_request
) {
5032 /* Warn if this is a potentially silly
5035 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5036 struct md_rdev
*rdev2
;
5039 rdev_for_each(rdev
, mddev
)
5040 rdev_for_each(rdev2
, mddev
) {
5042 rdev
->bdev
->bd_contains
==
5043 rdev2
->bdev
->bd_contains
) {
5045 "%s: WARNING: %s appears to be"
5046 " on the same physical disk as"
5049 bdevname(rdev
->bdev
,b
),
5050 bdevname(rdev2
->bdev
,b2
));
5057 "True protection against single-disk"
5058 " failure might be compromised.\n");
5061 mddev
->recovery
= 0;
5062 /* may be over-ridden by personality */
5063 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5065 mddev
->ok_start_degraded
= start_dirty_degraded
;
5067 if (start_readonly
&& mddev
->ro
== 0)
5068 mddev
->ro
= 2; /* read-only, but switch on first write */
5070 err
= mddev
->pers
->run(mddev
);
5072 printk(KERN_ERR
"md: pers->run() failed ...\n");
5073 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5074 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5075 " but 'external_size' not in effect?\n", __func__
);
5077 "md: invalid array_size %llu > default size %llu\n",
5078 (unsigned long long)mddev
->array_sectors
/ 2,
5079 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5081 mddev
->pers
->stop(mddev
);
5083 if (err
== 0 && mddev
->pers
->sync_request
&&
5084 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5085 err
= bitmap_create(mddev
);
5087 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5088 mdname(mddev
), err
);
5089 mddev
->pers
->stop(mddev
);
5093 module_put(mddev
->pers
->owner
);
5095 bitmap_destroy(mddev
);
5098 if (mddev
->pers
->sync_request
) {
5099 if (mddev
->kobj
.sd
&&
5100 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5102 "md: cannot register extra attributes for %s\n",
5104 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5105 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5108 atomic_set(&mddev
->writes_pending
,0);
5109 atomic_set(&mddev
->max_corr_read_errors
,
5110 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5111 mddev
->safemode
= 0;
5112 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5113 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5114 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5118 rdev_for_each(rdev
, mddev
)
5119 if (rdev
->raid_disk
>= 0)
5120 if (sysfs_link_rdev(mddev
, rdev
))
5121 /* failure here is OK */;
5123 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5126 md_update_sb(mddev
, 0);
5128 md_new_event(mddev
);
5129 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5130 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5131 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5134 EXPORT_SYMBOL_GPL(md_run
);
5136 static int do_md_run(struct mddev
*mddev
)
5140 err
= md_run(mddev
);
5143 err
= bitmap_load(mddev
);
5145 bitmap_destroy(mddev
);
5149 md_wakeup_thread(mddev
->thread
);
5150 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5152 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5153 revalidate_disk(mddev
->gendisk
);
5155 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5160 static int restart_array(struct mddev
*mddev
)
5162 struct gendisk
*disk
= mddev
->gendisk
;
5164 /* Complain if it has no devices */
5165 if (list_empty(&mddev
->disks
))
5171 mddev
->safemode
= 0;
5173 set_disk_ro(disk
, 0);
5174 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5176 /* Kick recovery or resync if necessary */
5177 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5178 md_wakeup_thread(mddev
->thread
);
5179 md_wakeup_thread(mddev
->sync_thread
);
5180 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5184 /* similar to deny_write_access, but accounts for our holding a reference
5185 * to the file ourselves */
5186 static int deny_bitmap_write_access(struct file
* file
)
5188 struct inode
*inode
= file
->f_mapping
->host
;
5190 spin_lock(&inode
->i_lock
);
5191 if (atomic_read(&inode
->i_writecount
) > 1) {
5192 spin_unlock(&inode
->i_lock
);
5195 atomic_set(&inode
->i_writecount
, -1);
5196 spin_unlock(&inode
->i_lock
);
5201 void restore_bitmap_write_access(struct file
*file
)
5203 struct inode
*inode
= file
->f_mapping
->host
;
5205 spin_lock(&inode
->i_lock
);
5206 atomic_set(&inode
->i_writecount
, 1);
5207 spin_unlock(&inode
->i_lock
);
5210 static void md_clean(struct mddev
*mddev
)
5212 mddev
->array_sectors
= 0;
5213 mddev
->external_size
= 0;
5214 mddev
->dev_sectors
= 0;
5215 mddev
->raid_disks
= 0;
5216 mddev
->recovery_cp
= 0;
5217 mddev
->resync_min
= 0;
5218 mddev
->resync_max
= MaxSector
;
5219 mddev
->reshape_position
= MaxSector
;
5220 mddev
->external
= 0;
5221 mddev
->persistent
= 0;
5222 mddev
->level
= LEVEL_NONE
;
5223 mddev
->clevel
[0] = 0;
5226 mddev
->metadata_type
[0] = 0;
5227 mddev
->chunk_sectors
= 0;
5228 mddev
->ctime
= mddev
->utime
= 0;
5230 mddev
->max_disks
= 0;
5232 mddev
->can_decrease_events
= 0;
5233 mddev
->delta_disks
= 0;
5234 mddev
->reshape_backwards
= 0;
5235 mddev
->new_level
= LEVEL_NONE
;
5236 mddev
->new_layout
= 0;
5237 mddev
->new_chunk_sectors
= 0;
5238 mddev
->curr_resync
= 0;
5239 atomic64_set(&mddev
->resync_mismatches
, 0);
5240 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5241 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5242 mddev
->recovery
= 0;
5245 mddev
->degraded
= 0;
5246 mddev
->safemode
= 0;
5247 mddev
->merge_check_needed
= 0;
5248 mddev
->bitmap_info
.offset
= 0;
5249 mddev
->bitmap_info
.default_offset
= 0;
5250 mddev
->bitmap_info
.default_space
= 0;
5251 mddev
->bitmap_info
.chunksize
= 0;
5252 mddev
->bitmap_info
.daemon_sleep
= 0;
5253 mddev
->bitmap_info
.max_write_behind
= 0;
5256 static void __md_stop_writes(struct mddev
*mddev
)
5258 if (mddev
->sync_thread
) {
5259 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5260 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5261 reap_sync_thread(mddev
);
5264 del_timer_sync(&mddev
->safemode_timer
);
5266 bitmap_flush(mddev
);
5267 md_super_wait(mddev
);
5269 if (!mddev
->in_sync
|| mddev
->flags
) {
5270 /* mark array as shutdown cleanly */
5272 md_update_sb(mddev
, 1);
5276 void md_stop_writes(struct mddev
*mddev
)
5279 __md_stop_writes(mddev
);
5280 mddev_unlock(mddev
);
5282 EXPORT_SYMBOL_GPL(md_stop_writes
);
5284 void md_stop(struct mddev
*mddev
)
5287 mddev
->pers
->stop(mddev
);
5288 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5289 mddev
->to_remove
= &md_redundancy_group
;
5290 module_put(mddev
->pers
->owner
);
5292 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5294 EXPORT_SYMBOL_GPL(md_stop
);
5296 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5299 mutex_lock(&mddev
->open_mutex
);
5300 if (atomic_read(&mddev
->openers
) > !!bdev
) {
5301 printk("md: %s still in use.\n",mdname(mddev
));
5306 sync_blockdev(bdev
);
5308 __md_stop_writes(mddev
);
5314 set_disk_ro(mddev
->gendisk
, 1);
5315 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5316 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5320 mutex_unlock(&mddev
->open_mutex
);
5325 * 0 - completely stop and dis-assemble array
5326 * 2 - stop but do not disassemble array
5328 static int do_md_stop(struct mddev
* mddev
, int mode
,
5329 struct block_device
*bdev
)
5331 struct gendisk
*disk
= mddev
->gendisk
;
5332 struct md_rdev
*rdev
;
5334 mutex_lock(&mddev
->open_mutex
);
5335 if (atomic_read(&mddev
->openers
) > !!bdev
||
5336 mddev
->sysfs_active
) {
5337 printk("md: %s still in use.\n",mdname(mddev
));
5338 mutex_unlock(&mddev
->open_mutex
);
5342 /* It is possible IO was issued on some other
5343 * open file which was closed before we took ->open_mutex.
5344 * As that was not the last close __blkdev_put will not
5345 * have called sync_blockdev, so we must.
5347 sync_blockdev(bdev
);
5351 set_disk_ro(disk
, 0);
5353 __md_stop_writes(mddev
);
5355 mddev
->queue
->merge_bvec_fn
= NULL
;
5356 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5358 /* tell userspace to handle 'inactive' */
5359 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5361 rdev_for_each(rdev
, mddev
)
5362 if (rdev
->raid_disk
>= 0)
5363 sysfs_unlink_rdev(mddev
, rdev
);
5365 set_capacity(disk
, 0);
5366 mutex_unlock(&mddev
->open_mutex
);
5368 revalidate_disk(disk
);
5373 mutex_unlock(&mddev
->open_mutex
);
5375 * Free resources if final stop
5378 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5380 bitmap_destroy(mddev
);
5381 if (mddev
->bitmap_info
.file
) {
5382 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5383 fput(mddev
->bitmap_info
.file
);
5384 mddev
->bitmap_info
.file
= NULL
;
5386 mddev
->bitmap_info
.offset
= 0;
5388 export_array(mddev
);
5391 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5392 if (mddev
->hold_active
== UNTIL_STOP
)
5393 mddev
->hold_active
= 0;
5395 blk_integrity_unregister(disk
);
5396 md_new_event(mddev
);
5397 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5402 static void autorun_array(struct mddev
*mddev
)
5404 struct md_rdev
*rdev
;
5407 if (list_empty(&mddev
->disks
))
5410 printk(KERN_INFO
"md: running: ");
5412 rdev_for_each(rdev
, mddev
) {
5413 char b
[BDEVNAME_SIZE
];
5414 printk("<%s>", bdevname(rdev
->bdev
,b
));
5418 err
= do_md_run(mddev
);
5420 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5421 do_md_stop(mddev
, 0, NULL
);
5426 * lets try to run arrays based on all disks that have arrived
5427 * until now. (those are in pending_raid_disks)
5429 * the method: pick the first pending disk, collect all disks with
5430 * the same UUID, remove all from the pending list and put them into
5431 * the 'same_array' list. Then order this list based on superblock
5432 * update time (freshest comes first), kick out 'old' disks and
5433 * compare superblocks. If everything's fine then run it.
5435 * If "unit" is allocated, then bump its reference count
5437 static void autorun_devices(int part
)
5439 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5440 struct mddev
*mddev
;
5441 char b
[BDEVNAME_SIZE
];
5443 printk(KERN_INFO
"md: autorun ...\n");
5444 while (!list_empty(&pending_raid_disks
)) {
5447 LIST_HEAD(candidates
);
5448 rdev0
= list_entry(pending_raid_disks
.next
,
5449 struct md_rdev
, same_set
);
5451 printk(KERN_INFO
"md: considering %s ...\n",
5452 bdevname(rdev0
->bdev
,b
));
5453 INIT_LIST_HEAD(&candidates
);
5454 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5455 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5456 printk(KERN_INFO
"md: adding %s ...\n",
5457 bdevname(rdev
->bdev
,b
));
5458 list_move(&rdev
->same_set
, &candidates
);
5461 * now we have a set of devices, with all of them having
5462 * mostly sane superblocks. It's time to allocate the
5466 dev
= MKDEV(mdp_major
,
5467 rdev0
->preferred_minor
<< MdpMinorShift
);
5468 unit
= MINOR(dev
) >> MdpMinorShift
;
5470 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5473 if (rdev0
->preferred_minor
!= unit
) {
5474 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5475 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5479 md_probe(dev
, NULL
, NULL
);
5480 mddev
= mddev_find(dev
);
5481 if (!mddev
|| !mddev
->gendisk
) {
5485 "md: cannot allocate memory for md drive.\n");
5488 if (mddev_lock(mddev
))
5489 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5491 else if (mddev
->raid_disks
|| mddev
->major_version
5492 || !list_empty(&mddev
->disks
)) {
5494 "md: %s already running, cannot run %s\n",
5495 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5496 mddev_unlock(mddev
);
5498 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5499 mddev
->persistent
= 1;
5500 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5501 list_del_init(&rdev
->same_set
);
5502 if (bind_rdev_to_array(rdev
, mddev
))
5505 autorun_array(mddev
);
5506 mddev_unlock(mddev
);
5508 /* on success, candidates will be empty, on error
5511 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5512 list_del_init(&rdev
->same_set
);
5517 printk(KERN_INFO
"md: ... autorun DONE.\n");
5519 #endif /* !MODULE */
5521 static int get_version(void __user
* arg
)
5525 ver
.major
= MD_MAJOR_VERSION
;
5526 ver
.minor
= MD_MINOR_VERSION
;
5527 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5529 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5535 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5537 mdu_array_info_t info
;
5538 int nr
,working
,insync
,failed
,spare
;
5539 struct md_rdev
*rdev
;
5541 nr
= working
= insync
= failed
= spare
= 0;
5543 rdev_for_each_rcu(rdev
, mddev
) {
5545 if (test_bit(Faulty
, &rdev
->flags
))
5549 if (test_bit(In_sync
, &rdev
->flags
))
5557 info
.major_version
= mddev
->major_version
;
5558 info
.minor_version
= mddev
->minor_version
;
5559 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5560 info
.ctime
= mddev
->ctime
;
5561 info
.level
= mddev
->level
;
5562 info
.size
= mddev
->dev_sectors
/ 2;
5563 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5566 info
.raid_disks
= mddev
->raid_disks
;
5567 info
.md_minor
= mddev
->md_minor
;
5568 info
.not_persistent
= !mddev
->persistent
;
5570 info
.utime
= mddev
->utime
;
5573 info
.state
= (1<<MD_SB_CLEAN
);
5574 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5575 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5576 info
.active_disks
= insync
;
5577 info
.working_disks
= working
;
5578 info
.failed_disks
= failed
;
5579 info
.spare_disks
= spare
;
5581 info
.layout
= mddev
->layout
;
5582 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5584 if (copy_to_user(arg
, &info
, sizeof(info
)))
5590 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5592 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5593 char *ptr
, *buf
= NULL
;
5596 if (md_allow_write(mddev
))
5597 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5599 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5604 /* bitmap disabled, zero the first byte and copy out */
5605 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5606 file
->pathname
[0] = '\0';
5610 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5614 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5615 buf
, sizeof(file
->pathname
));
5619 strcpy(file
->pathname
, ptr
);
5623 if (copy_to_user(arg
, file
, sizeof(*file
)))
5631 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5633 mdu_disk_info_t info
;
5634 struct md_rdev
*rdev
;
5636 if (copy_from_user(&info
, arg
, sizeof(info
)))
5640 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5642 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5643 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5644 info
.raid_disk
= rdev
->raid_disk
;
5646 if (test_bit(Faulty
, &rdev
->flags
))
5647 info
.state
|= (1<<MD_DISK_FAULTY
);
5648 else if (test_bit(In_sync
, &rdev
->flags
)) {
5649 info
.state
|= (1<<MD_DISK_ACTIVE
);
5650 info
.state
|= (1<<MD_DISK_SYNC
);
5652 if (test_bit(WriteMostly
, &rdev
->flags
))
5653 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5655 info
.major
= info
.minor
= 0;
5656 info
.raid_disk
= -1;
5657 info
.state
= (1<<MD_DISK_REMOVED
);
5661 if (copy_to_user(arg
, &info
, sizeof(info
)))
5667 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5669 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5670 struct md_rdev
*rdev
;
5671 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5673 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5676 if (!mddev
->raid_disks
) {
5678 /* expecting a device which has a superblock */
5679 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5682 "md: md_import_device returned %ld\n",
5684 return PTR_ERR(rdev
);
5686 if (!list_empty(&mddev
->disks
)) {
5687 struct md_rdev
*rdev0
5688 = list_entry(mddev
->disks
.next
,
5689 struct md_rdev
, same_set
);
5690 err
= super_types
[mddev
->major_version
]
5691 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5694 "md: %s has different UUID to %s\n",
5695 bdevname(rdev
->bdev
,b
),
5696 bdevname(rdev0
->bdev
,b2
));
5701 err
= bind_rdev_to_array(rdev
, mddev
);
5708 * add_new_disk can be used once the array is assembled
5709 * to add "hot spares". They must already have a superblock
5714 if (!mddev
->pers
->hot_add_disk
) {
5716 "%s: personality does not support diskops!\n",
5720 if (mddev
->persistent
)
5721 rdev
= md_import_device(dev
, mddev
->major_version
,
5722 mddev
->minor_version
);
5724 rdev
= md_import_device(dev
, -1, -1);
5727 "md: md_import_device returned %ld\n",
5729 return PTR_ERR(rdev
);
5731 /* set saved_raid_disk if appropriate */
5732 if (!mddev
->persistent
) {
5733 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5734 info
->raid_disk
< mddev
->raid_disks
) {
5735 rdev
->raid_disk
= info
->raid_disk
;
5736 set_bit(In_sync
, &rdev
->flags
);
5738 rdev
->raid_disk
= -1;
5740 super_types
[mddev
->major_version
].
5741 validate_super(mddev
, rdev
);
5742 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5743 rdev
->raid_disk
!= info
->raid_disk
) {
5744 /* This was a hot-add request, but events doesn't
5745 * match, so reject it.
5751 if (test_bit(In_sync
, &rdev
->flags
))
5752 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5754 rdev
->saved_raid_disk
= -1;
5756 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5757 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5758 set_bit(WriteMostly
, &rdev
->flags
);
5760 clear_bit(WriteMostly
, &rdev
->flags
);
5762 rdev
->raid_disk
= -1;
5763 err
= bind_rdev_to_array(rdev
, mddev
);
5764 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5765 /* If there is hot_add_disk but no hot_remove_disk
5766 * then added disks for geometry changes,
5767 * and should be added immediately.
5769 super_types
[mddev
->major_version
].
5770 validate_super(mddev
, rdev
);
5771 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5773 unbind_rdev_from_array(rdev
);
5778 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5780 md_update_sb(mddev
, 1);
5781 if (mddev
->degraded
)
5782 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5783 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5785 md_new_event(mddev
);
5786 md_wakeup_thread(mddev
->thread
);
5790 /* otherwise, add_new_disk is only allowed
5791 * for major_version==0 superblocks
5793 if (mddev
->major_version
!= 0) {
5794 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5799 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5801 rdev
= md_import_device(dev
, -1, 0);
5804 "md: error, md_import_device() returned %ld\n",
5806 return PTR_ERR(rdev
);
5808 rdev
->desc_nr
= info
->number
;
5809 if (info
->raid_disk
< mddev
->raid_disks
)
5810 rdev
->raid_disk
= info
->raid_disk
;
5812 rdev
->raid_disk
= -1;
5814 if (rdev
->raid_disk
< mddev
->raid_disks
)
5815 if (info
->state
& (1<<MD_DISK_SYNC
))
5816 set_bit(In_sync
, &rdev
->flags
);
5818 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5819 set_bit(WriteMostly
, &rdev
->flags
);
5821 if (!mddev
->persistent
) {
5822 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5823 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5825 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5826 rdev
->sectors
= rdev
->sb_start
;
5828 err
= bind_rdev_to_array(rdev
, mddev
);
5838 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5840 char b
[BDEVNAME_SIZE
];
5841 struct md_rdev
*rdev
;
5843 rdev
= find_rdev(mddev
, dev
);
5847 if (rdev
->raid_disk
>= 0)
5850 kick_rdev_from_array(rdev
);
5851 md_update_sb(mddev
, 1);
5852 md_new_event(mddev
);
5856 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5857 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5861 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5863 char b
[BDEVNAME_SIZE
];
5865 struct md_rdev
*rdev
;
5870 if (mddev
->major_version
!= 0) {
5871 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5872 " version-0 superblocks.\n",
5876 if (!mddev
->pers
->hot_add_disk
) {
5878 "%s: personality does not support diskops!\n",
5883 rdev
= md_import_device(dev
, -1, 0);
5886 "md: error, md_import_device() returned %ld\n",
5891 if (mddev
->persistent
)
5892 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5894 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5896 rdev
->sectors
= rdev
->sb_start
;
5898 if (test_bit(Faulty
, &rdev
->flags
)) {
5900 "md: can not hot-add faulty %s disk to %s!\n",
5901 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5905 clear_bit(In_sync
, &rdev
->flags
);
5907 rdev
->saved_raid_disk
= -1;
5908 err
= bind_rdev_to_array(rdev
, mddev
);
5913 * The rest should better be atomic, we can have disk failures
5914 * noticed in interrupt contexts ...
5917 rdev
->raid_disk
= -1;
5919 md_update_sb(mddev
, 1);
5922 * Kick recovery, maybe this spare has to be added to the
5923 * array immediately.
5925 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5926 md_wakeup_thread(mddev
->thread
);
5927 md_new_event(mddev
);
5935 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5940 if (!mddev
->pers
->quiesce
)
5942 if (mddev
->recovery
|| mddev
->sync_thread
)
5944 /* we should be able to change the bitmap.. */
5950 return -EEXIST
; /* cannot add when bitmap is present */
5951 mddev
->bitmap_info
.file
= fget(fd
);
5953 if (mddev
->bitmap_info
.file
== NULL
) {
5954 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5959 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5961 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5963 fput(mddev
->bitmap_info
.file
);
5964 mddev
->bitmap_info
.file
= NULL
;
5967 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5968 } else if (mddev
->bitmap
== NULL
)
5969 return -ENOENT
; /* cannot remove what isn't there */
5972 mddev
->pers
->quiesce(mddev
, 1);
5974 err
= bitmap_create(mddev
);
5976 err
= bitmap_load(mddev
);
5978 if (fd
< 0 || err
) {
5979 bitmap_destroy(mddev
);
5980 fd
= -1; /* make sure to put the file */
5982 mddev
->pers
->quiesce(mddev
, 0);
5985 if (mddev
->bitmap_info
.file
) {
5986 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5987 fput(mddev
->bitmap_info
.file
);
5989 mddev
->bitmap_info
.file
= NULL
;
5996 * set_array_info is used two different ways
5997 * The original usage is when creating a new array.
5998 * In this usage, raid_disks is > 0 and it together with
5999 * level, size, not_persistent,layout,chunksize determine the
6000 * shape of the array.
6001 * This will always create an array with a type-0.90.0 superblock.
6002 * The newer usage is when assembling an array.
6003 * In this case raid_disks will be 0, and the major_version field is
6004 * use to determine which style super-blocks are to be found on the devices.
6005 * The minor and patch _version numbers are also kept incase the
6006 * super_block handler wishes to interpret them.
6008 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6011 if (info
->raid_disks
== 0) {
6012 /* just setting version number for superblock loading */
6013 if (info
->major_version
< 0 ||
6014 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6015 super_types
[info
->major_version
].name
== NULL
) {
6016 /* maybe try to auto-load a module? */
6018 "md: superblock version %d not known\n",
6019 info
->major_version
);
6022 mddev
->major_version
= info
->major_version
;
6023 mddev
->minor_version
= info
->minor_version
;
6024 mddev
->patch_version
= info
->patch_version
;
6025 mddev
->persistent
= !info
->not_persistent
;
6026 /* ensure mddev_put doesn't delete this now that there
6027 * is some minimal configuration.
6029 mddev
->ctime
= get_seconds();
6032 mddev
->major_version
= MD_MAJOR_VERSION
;
6033 mddev
->minor_version
= MD_MINOR_VERSION
;
6034 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6035 mddev
->ctime
= get_seconds();
6037 mddev
->level
= info
->level
;
6038 mddev
->clevel
[0] = 0;
6039 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6040 mddev
->raid_disks
= info
->raid_disks
;
6041 /* don't set md_minor, it is determined by which /dev/md* was
6044 if (info
->state
& (1<<MD_SB_CLEAN
))
6045 mddev
->recovery_cp
= MaxSector
;
6047 mddev
->recovery_cp
= 0;
6048 mddev
->persistent
= ! info
->not_persistent
;
6049 mddev
->external
= 0;
6051 mddev
->layout
= info
->layout
;
6052 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6054 mddev
->max_disks
= MD_SB_DISKS
;
6056 if (mddev
->persistent
)
6058 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6060 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6061 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6062 mddev
->bitmap_info
.offset
= 0;
6064 mddev
->reshape_position
= MaxSector
;
6067 * Generate a 128 bit UUID
6069 get_random_bytes(mddev
->uuid
, 16);
6071 mddev
->new_level
= mddev
->level
;
6072 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6073 mddev
->new_layout
= mddev
->layout
;
6074 mddev
->delta_disks
= 0;
6075 mddev
->reshape_backwards
= 0;
6080 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6082 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6084 if (mddev
->external_size
)
6087 mddev
->array_sectors
= array_sectors
;
6089 EXPORT_SYMBOL(md_set_array_sectors
);
6091 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6093 struct md_rdev
*rdev
;
6095 int fit
= (num_sectors
== 0);
6097 if (mddev
->pers
->resize
== NULL
)
6099 /* The "num_sectors" is the number of sectors of each device that
6100 * is used. This can only make sense for arrays with redundancy.
6101 * linear and raid0 always use whatever space is available. We can only
6102 * consider changing this number if no resync or reconstruction is
6103 * happening, and if the new size is acceptable. It must fit before the
6104 * sb_start or, if that is <data_offset, it must fit before the size
6105 * of each device. If num_sectors is zero, we find the largest size
6108 if (mddev
->sync_thread
)
6111 rdev_for_each(rdev
, mddev
) {
6112 sector_t avail
= rdev
->sectors
;
6114 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6115 num_sectors
= avail
;
6116 if (avail
< num_sectors
)
6119 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6121 revalidate_disk(mddev
->gendisk
);
6125 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6128 struct md_rdev
*rdev
;
6129 /* change the number of raid disks */
6130 if (mddev
->pers
->check_reshape
== NULL
)
6132 if (raid_disks
<= 0 ||
6133 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6135 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6138 rdev_for_each(rdev
, mddev
) {
6139 if (mddev
->raid_disks
< raid_disks
&&
6140 rdev
->data_offset
< rdev
->new_data_offset
)
6142 if (mddev
->raid_disks
> raid_disks
&&
6143 rdev
->data_offset
> rdev
->new_data_offset
)
6147 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6148 if (mddev
->delta_disks
< 0)
6149 mddev
->reshape_backwards
= 1;
6150 else if (mddev
->delta_disks
> 0)
6151 mddev
->reshape_backwards
= 0;
6153 rv
= mddev
->pers
->check_reshape(mddev
);
6155 mddev
->delta_disks
= 0;
6156 mddev
->reshape_backwards
= 0;
6163 * update_array_info is used to change the configuration of an
6165 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6166 * fields in the info are checked against the array.
6167 * Any differences that cannot be handled will cause an error.
6168 * Normally, only one change can be managed at a time.
6170 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6176 /* calculate expected state,ignoring low bits */
6177 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6178 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6180 if (mddev
->major_version
!= info
->major_version
||
6181 mddev
->minor_version
!= info
->minor_version
||
6182 /* mddev->patch_version != info->patch_version || */
6183 mddev
->ctime
!= info
->ctime
||
6184 mddev
->level
!= info
->level
||
6185 /* mddev->layout != info->layout || */
6186 !mddev
->persistent
!= info
->not_persistent
||
6187 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6188 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6189 ((state
^info
->state
) & 0xfffffe00)
6192 /* Check there is only one change */
6193 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6195 if (mddev
->raid_disks
!= info
->raid_disks
)
6197 if (mddev
->layout
!= info
->layout
)
6199 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6206 if (mddev
->layout
!= info
->layout
) {
6208 * we don't need to do anything at the md level, the
6209 * personality will take care of it all.
6211 if (mddev
->pers
->check_reshape
== NULL
)
6214 mddev
->new_layout
= info
->layout
;
6215 rv
= mddev
->pers
->check_reshape(mddev
);
6217 mddev
->new_layout
= mddev
->layout
;
6221 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6222 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6224 if (mddev
->raid_disks
!= info
->raid_disks
)
6225 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6227 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6228 if (mddev
->pers
->quiesce
== NULL
)
6230 if (mddev
->recovery
|| mddev
->sync_thread
)
6232 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6233 /* add the bitmap */
6236 if (mddev
->bitmap_info
.default_offset
== 0)
6238 mddev
->bitmap_info
.offset
=
6239 mddev
->bitmap_info
.default_offset
;
6240 mddev
->bitmap_info
.space
=
6241 mddev
->bitmap_info
.default_space
;
6242 mddev
->pers
->quiesce(mddev
, 1);
6243 rv
= bitmap_create(mddev
);
6245 rv
= bitmap_load(mddev
);
6247 bitmap_destroy(mddev
);
6248 mddev
->pers
->quiesce(mddev
, 0);
6250 /* remove the bitmap */
6253 if (mddev
->bitmap
->storage
.file
)
6255 mddev
->pers
->quiesce(mddev
, 1);
6256 bitmap_destroy(mddev
);
6257 mddev
->pers
->quiesce(mddev
, 0);
6258 mddev
->bitmap_info
.offset
= 0;
6261 md_update_sb(mddev
, 1);
6265 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6267 struct md_rdev
*rdev
;
6270 if (mddev
->pers
== NULL
)
6274 rdev
= find_rdev_rcu(mddev
, dev
);
6278 md_error(mddev
, rdev
);
6279 if (!test_bit(Faulty
, &rdev
->flags
))
6287 * We have a problem here : there is no easy way to give a CHS
6288 * virtual geometry. We currently pretend that we have a 2 heads
6289 * 4 sectors (with a BIG number of cylinders...). This drives
6290 * dosfs just mad... ;-)
6292 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6294 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6298 geo
->cylinders
= mddev
->array_sectors
/ 8;
6302 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6303 unsigned int cmd
, unsigned long arg
)
6306 void __user
*argp
= (void __user
*)arg
;
6307 struct mddev
*mddev
= NULL
;
6312 case GET_ARRAY_INFO
:
6316 if (!capable(CAP_SYS_ADMIN
))
6321 * Commands dealing with the RAID driver but not any
6327 err
= get_version(argp
);
6330 case PRINT_RAID_DEBUG
:
6338 autostart_arrays(arg
);
6345 * Commands creating/starting a new array:
6348 mddev
= bdev
->bd_disk
->private_data
;
6355 /* Some actions do not requires the mutex */
6357 case GET_ARRAY_INFO
:
6358 if (!mddev
->raid_disks
&& !mddev
->external
)
6361 err
= get_array_info(mddev
, argp
);
6365 if (!mddev
->raid_disks
&& !mddev
->external
)
6368 err
= get_disk_info(mddev
, argp
);
6371 case SET_DISK_FAULTY
:
6372 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6376 err
= mddev_lock(mddev
);
6379 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6386 case SET_ARRAY_INFO
:
6388 mdu_array_info_t info
;
6390 memset(&info
, 0, sizeof(info
));
6391 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6396 err
= update_array_info(mddev
, &info
);
6398 printk(KERN_WARNING
"md: couldn't update"
6399 " array info. %d\n", err
);
6404 if (!list_empty(&mddev
->disks
)) {
6406 "md: array %s already has disks!\n",
6411 if (mddev
->raid_disks
) {
6413 "md: array %s already initialised!\n",
6418 err
= set_array_info(mddev
, &info
);
6420 printk(KERN_WARNING
"md: couldn't set"
6421 " array info. %d\n", err
);
6431 * Commands querying/configuring an existing array:
6433 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6434 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6435 if ((!mddev
->raid_disks
&& !mddev
->external
)
6436 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6437 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6438 && cmd
!= GET_BITMAP_FILE
) {
6444 * Commands even a read-only array can execute:
6448 case GET_BITMAP_FILE
:
6449 err
= get_bitmap_file(mddev
, argp
);
6452 case RESTART_ARRAY_RW
:
6453 err
= restart_array(mddev
);
6457 err
= do_md_stop(mddev
, 0, bdev
);
6461 err
= md_set_readonly(mddev
, bdev
);
6465 if (get_user(ro
, (int __user
*)(arg
))) {
6471 /* if the bdev is going readonly the value of mddev->ro
6472 * does not matter, no writes are coming
6477 /* are we are already prepared for writes? */
6481 /* transitioning to readauto need only happen for
6482 * arrays that call md_write_start
6485 err
= restart_array(mddev
);
6488 set_disk_ro(mddev
->gendisk
, 0);
6495 * The remaining ioctls are changing the state of the
6496 * superblock, so we do not allow them on read-only arrays.
6497 * However non-MD ioctls (e.g. get-size) will still come through
6498 * here and hit the 'default' below, so only disallow
6499 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6501 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6502 if (mddev
->ro
== 2) {
6504 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6505 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6506 md_wakeup_thread(mddev
->thread
);
6517 mdu_disk_info_t info
;
6518 if (copy_from_user(&info
, argp
, sizeof(info
)))
6521 err
= add_new_disk(mddev
, &info
);
6525 case HOT_REMOVE_DISK
:
6526 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6530 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6534 err
= do_md_run(mddev
);
6537 case SET_BITMAP_FILE
:
6538 err
= set_bitmap_file(mddev
, (int)arg
);
6548 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6550 mddev
->hold_active
= 0;
6551 mddev_unlock(mddev
);
6560 #ifdef CONFIG_COMPAT
6561 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6562 unsigned int cmd
, unsigned long arg
)
6565 case HOT_REMOVE_DISK
:
6567 case SET_DISK_FAULTY
:
6568 case SET_BITMAP_FILE
:
6569 /* These take in integer arg, do not convert */
6572 arg
= (unsigned long)compat_ptr(arg
);
6576 return md_ioctl(bdev
, mode
, cmd
, arg
);
6578 #endif /* CONFIG_COMPAT */
6580 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6583 * Succeed if we can lock the mddev, which confirms that
6584 * it isn't being stopped right now.
6586 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6592 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6593 /* we are racing with mddev_put which is discarding this
6597 /* Wait until bdev->bd_disk is definitely gone */
6598 flush_workqueue(md_misc_wq
);
6599 /* Then retry the open from the top */
6600 return -ERESTARTSYS
;
6602 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6604 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6608 atomic_inc(&mddev
->openers
);
6609 mutex_unlock(&mddev
->open_mutex
);
6611 check_disk_change(bdev
);
6616 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6618 struct mddev
*mddev
= disk
->private_data
;
6621 atomic_dec(&mddev
->openers
);
6627 static int md_media_changed(struct gendisk
*disk
)
6629 struct mddev
*mddev
= disk
->private_data
;
6631 return mddev
->changed
;
6634 static int md_revalidate(struct gendisk
*disk
)
6636 struct mddev
*mddev
= disk
->private_data
;
6641 static const struct block_device_operations md_fops
=
6643 .owner
= THIS_MODULE
,
6645 .release
= md_release
,
6647 #ifdef CONFIG_COMPAT
6648 .compat_ioctl
= md_compat_ioctl
,
6650 .getgeo
= md_getgeo
,
6651 .media_changed
= md_media_changed
,
6652 .revalidate_disk
= md_revalidate
,
6655 static int md_thread(void * arg
)
6657 struct md_thread
*thread
= arg
;
6660 * md_thread is a 'system-thread', it's priority should be very
6661 * high. We avoid resource deadlocks individually in each
6662 * raid personality. (RAID5 does preallocation) We also use RR and
6663 * the very same RT priority as kswapd, thus we will never get
6664 * into a priority inversion deadlock.
6666 * we definitely have to have equal or higher priority than
6667 * bdflush, otherwise bdflush will deadlock if there are too
6668 * many dirty RAID5 blocks.
6671 allow_signal(SIGKILL
);
6672 while (!kthread_should_stop()) {
6674 /* We need to wait INTERRUPTIBLE so that
6675 * we don't add to the load-average.
6676 * That means we need to be sure no signals are
6679 if (signal_pending(current
))
6680 flush_signals(current
);
6682 wait_event_interruptible_timeout
6684 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6685 || kthread_should_stop(),
6688 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6689 if (!kthread_should_stop())
6690 thread
->run(thread
);
6696 void md_wakeup_thread(struct md_thread
*thread
)
6699 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6700 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6701 wake_up(&thread
->wqueue
);
6705 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6706 struct mddev
*mddev
, const char *name
)
6708 struct md_thread
*thread
;
6710 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6714 init_waitqueue_head(&thread
->wqueue
);
6717 thread
->mddev
= mddev
;
6718 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6719 thread
->tsk
= kthread_run(md_thread
, thread
,
6721 mdname(thread
->mddev
),
6723 if (IS_ERR(thread
->tsk
)) {
6730 void md_unregister_thread(struct md_thread
**threadp
)
6732 struct md_thread
*thread
= *threadp
;
6735 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6736 /* Locking ensures that mddev_unlock does not wake_up a
6737 * non-existent thread
6739 spin_lock(&pers_lock
);
6741 spin_unlock(&pers_lock
);
6743 kthread_stop(thread
->tsk
);
6747 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6754 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6757 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6759 mddev
->pers
->error_handler(mddev
,rdev
);
6760 if (mddev
->degraded
)
6761 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6762 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6763 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6764 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6765 md_wakeup_thread(mddev
->thread
);
6766 if (mddev
->event_work
.func
)
6767 queue_work(md_misc_wq
, &mddev
->event_work
);
6768 md_new_event_inintr(mddev
);
6771 /* seq_file implementation /proc/mdstat */
6773 static void status_unused(struct seq_file
*seq
)
6776 struct md_rdev
*rdev
;
6778 seq_printf(seq
, "unused devices: ");
6780 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6781 char b
[BDEVNAME_SIZE
];
6783 seq_printf(seq
, "%s ",
6784 bdevname(rdev
->bdev
,b
));
6787 seq_printf(seq
, "<none>");
6789 seq_printf(seq
, "\n");
6793 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6795 sector_t max_sectors
, resync
, res
;
6796 unsigned long dt
, db
;
6799 unsigned int per_milli
;
6801 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6803 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6804 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6805 max_sectors
= mddev
->resync_max_sectors
;
6807 max_sectors
= mddev
->dev_sectors
;
6810 * Should not happen.
6816 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6817 * in a sector_t, and (max_sectors>>scale) will fit in a
6818 * u32, as those are the requirements for sector_div.
6819 * Thus 'scale' must be at least 10
6822 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6823 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6826 res
= (resync
>>scale
)*1000;
6827 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6831 int i
, x
= per_milli
/50, y
= 20-x
;
6832 seq_printf(seq
, "[");
6833 for (i
= 0; i
< x
; i
++)
6834 seq_printf(seq
, "=");
6835 seq_printf(seq
, ">");
6836 for (i
= 0; i
< y
; i
++)
6837 seq_printf(seq
, ".");
6838 seq_printf(seq
, "] ");
6840 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6841 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6843 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6845 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6846 "resync" : "recovery"))),
6847 per_milli
/10, per_milli
% 10,
6848 (unsigned long long) resync
/2,
6849 (unsigned long long) max_sectors
/2);
6852 * dt: time from mark until now
6853 * db: blocks written from mark until now
6854 * rt: remaining time
6856 * rt is a sector_t, so could be 32bit or 64bit.
6857 * So we divide before multiply in case it is 32bit and close
6859 * We scale the divisor (db) by 32 to avoid losing precision
6860 * near the end of resync when the number of remaining sectors
6862 * We then divide rt by 32 after multiplying by db to compensate.
6863 * The '+1' avoids division by zero if db is very small.
6865 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6867 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6868 - mddev
->resync_mark_cnt
;
6870 rt
= max_sectors
- resync
; /* number of remaining sectors */
6871 sector_div(rt
, db
/32+1);
6875 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6876 ((unsigned long)rt
% 60)/6);
6878 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6881 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6883 struct list_head
*tmp
;
6885 struct mddev
*mddev
;
6893 spin_lock(&all_mddevs_lock
);
6894 list_for_each(tmp
,&all_mddevs
)
6896 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6898 spin_unlock(&all_mddevs_lock
);
6901 spin_unlock(&all_mddevs_lock
);
6903 return (void*)2;/* tail */
6907 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6909 struct list_head
*tmp
;
6910 struct mddev
*next_mddev
, *mddev
= v
;
6916 spin_lock(&all_mddevs_lock
);
6918 tmp
= all_mddevs
.next
;
6920 tmp
= mddev
->all_mddevs
.next
;
6921 if (tmp
!= &all_mddevs
)
6922 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6924 next_mddev
= (void*)2;
6927 spin_unlock(&all_mddevs_lock
);
6935 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6937 struct mddev
*mddev
= v
;
6939 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6943 static int md_seq_show(struct seq_file
*seq
, void *v
)
6945 struct mddev
*mddev
= v
;
6947 struct md_rdev
*rdev
;
6949 if (v
== (void*)1) {
6950 struct md_personality
*pers
;
6951 seq_printf(seq
, "Personalities : ");
6952 spin_lock(&pers_lock
);
6953 list_for_each_entry(pers
, &pers_list
, list
)
6954 seq_printf(seq
, "[%s] ", pers
->name
);
6956 spin_unlock(&pers_lock
);
6957 seq_printf(seq
, "\n");
6958 seq
->poll_event
= atomic_read(&md_event_count
);
6961 if (v
== (void*)2) {
6966 if (mddev_lock(mddev
) < 0)
6969 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6970 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6971 mddev
->pers
? "" : "in");
6974 seq_printf(seq
, " (read-only)");
6976 seq_printf(seq
, " (auto-read-only)");
6977 seq_printf(seq
, " %s", mddev
->pers
->name
);
6981 rdev_for_each(rdev
, mddev
) {
6982 char b
[BDEVNAME_SIZE
];
6983 seq_printf(seq
, " %s[%d]",
6984 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6985 if (test_bit(WriteMostly
, &rdev
->flags
))
6986 seq_printf(seq
, "(W)");
6987 if (test_bit(Faulty
, &rdev
->flags
)) {
6988 seq_printf(seq
, "(F)");
6991 if (rdev
->raid_disk
< 0)
6992 seq_printf(seq
, "(S)"); /* spare */
6993 if (test_bit(Replacement
, &rdev
->flags
))
6994 seq_printf(seq
, "(R)");
6995 sectors
+= rdev
->sectors
;
6998 if (!list_empty(&mddev
->disks
)) {
7000 seq_printf(seq
, "\n %llu blocks",
7001 (unsigned long long)
7002 mddev
->array_sectors
/ 2);
7004 seq_printf(seq
, "\n %llu blocks",
7005 (unsigned long long)sectors
/ 2);
7007 if (mddev
->persistent
) {
7008 if (mddev
->major_version
!= 0 ||
7009 mddev
->minor_version
!= 90) {
7010 seq_printf(seq
," super %d.%d",
7011 mddev
->major_version
,
7012 mddev
->minor_version
);
7014 } else if (mddev
->external
)
7015 seq_printf(seq
, " super external:%s",
7016 mddev
->metadata_type
);
7018 seq_printf(seq
, " super non-persistent");
7021 mddev
->pers
->status(seq
, mddev
);
7022 seq_printf(seq
, "\n ");
7023 if (mddev
->pers
->sync_request
) {
7024 if (mddev
->curr_resync
> 2) {
7025 status_resync(seq
, mddev
);
7026 seq_printf(seq
, "\n ");
7027 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
7028 seq_printf(seq
, "\tresync=DELAYED\n ");
7029 else if (mddev
->recovery_cp
< MaxSector
)
7030 seq_printf(seq
, "\tresync=PENDING\n ");
7033 seq_printf(seq
, "\n ");
7035 bitmap_status(seq
, mddev
->bitmap
);
7037 seq_printf(seq
, "\n");
7039 mddev_unlock(mddev
);
7044 static const struct seq_operations md_seq_ops
= {
7045 .start
= md_seq_start
,
7046 .next
= md_seq_next
,
7047 .stop
= md_seq_stop
,
7048 .show
= md_seq_show
,
7051 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7053 struct seq_file
*seq
;
7056 error
= seq_open(file
, &md_seq_ops
);
7060 seq
= file
->private_data
;
7061 seq
->poll_event
= atomic_read(&md_event_count
);
7065 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7067 struct seq_file
*seq
= filp
->private_data
;
7070 poll_wait(filp
, &md_event_waiters
, wait
);
7072 /* always allow read */
7073 mask
= POLLIN
| POLLRDNORM
;
7075 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7076 mask
|= POLLERR
| POLLPRI
;
7080 static const struct file_operations md_seq_fops
= {
7081 .owner
= THIS_MODULE
,
7082 .open
= md_seq_open
,
7084 .llseek
= seq_lseek
,
7085 .release
= seq_release_private
,
7086 .poll
= mdstat_poll
,
7089 int register_md_personality(struct md_personality
*p
)
7091 spin_lock(&pers_lock
);
7092 list_add_tail(&p
->list
, &pers_list
);
7093 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7094 spin_unlock(&pers_lock
);
7098 int unregister_md_personality(struct md_personality
*p
)
7100 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7101 spin_lock(&pers_lock
);
7102 list_del_init(&p
->list
);
7103 spin_unlock(&pers_lock
);
7107 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7109 struct md_rdev
* rdev
;
7115 rdev_for_each_rcu(rdev
, mddev
) {
7116 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7117 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7118 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7119 atomic_read(&disk
->sync_io
);
7120 /* sync IO will cause sync_io to increase before the disk_stats
7121 * as sync_io is counted when a request starts, and
7122 * disk_stats is counted when it completes.
7123 * So resync activity will cause curr_events to be smaller than
7124 * when there was no such activity.
7125 * non-sync IO will cause disk_stat to increase without
7126 * increasing sync_io so curr_events will (eventually)
7127 * be larger than it was before. Once it becomes
7128 * substantially larger, the test below will cause
7129 * the array to appear non-idle, and resync will slow
7131 * If there is a lot of outstanding resync activity when
7132 * we set last_event to curr_events, then all that activity
7133 * completing might cause the array to appear non-idle
7134 * and resync will be slowed down even though there might
7135 * not have been non-resync activity. This will only
7136 * happen once though. 'last_events' will soon reflect
7137 * the state where there is little or no outstanding
7138 * resync requests, and further resync activity will
7139 * always make curr_events less than last_events.
7142 if (init
|| curr_events
- rdev
->last_events
> 64) {
7143 rdev
->last_events
= curr_events
;
7151 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7153 /* another "blocks" (512byte) blocks have been synced */
7154 atomic_sub(blocks
, &mddev
->recovery_active
);
7155 wake_up(&mddev
->recovery_wait
);
7157 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7158 md_wakeup_thread(mddev
->thread
);
7159 // stop recovery, signal do_sync ....
7164 /* md_write_start(mddev, bi)
7165 * If we need to update some array metadata (e.g. 'active' flag
7166 * in superblock) before writing, schedule a superblock update
7167 * and wait for it to complete.
7169 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7172 if (bio_data_dir(bi
) != WRITE
)
7175 BUG_ON(mddev
->ro
== 1);
7176 if (mddev
->ro
== 2) {
7177 /* need to switch to read/write */
7179 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7180 md_wakeup_thread(mddev
->thread
);
7181 md_wakeup_thread(mddev
->sync_thread
);
7184 atomic_inc(&mddev
->writes_pending
);
7185 if (mddev
->safemode
== 1)
7186 mddev
->safemode
= 0;
7187 if (mddev
->in_sync
) {
7188 spin_lock_irq(&mddev
->write_lock
);
7189 if (mddev
->in_sync
) {
7191 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7192 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7193 md_wakeup_thread(mddev
->thread
);
7196 spin_unlock_irq(&mddev
->write_lock
);
7199 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7200 wait_event(mddev
->sb_wait
,
7201 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7204 void md_write_end(struct mddev
*mddev
)
7206 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7207 if (mddev
->safemode
== 2)
7208 md_wakeup_thread(mddev
->thread
);
7209 else if (mddev
->safemode_delay
)
7210 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7214 /* md_allow_write(mddev)
7215 * Calling this ensures that the array is marked 'active' so that writes
7216 * may proceed without blocking. It is important to call this before
7217 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7218 * Must be called with mddev_lock held.
7220 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7221 * is dropped, so return -EAGAIN after notifying userspace.
7223 int md_allow_write(struct mddev
*mddev
)
7229 if (!mddev
->pers
->sync_request
)
7232 spin_lock_irq(&mddev
->write_lock
);
7233 if (mddev
->in_sync
) {
7235 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7236 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7237 if (mddev
->safemode_delay
&&
7238 mddev
->safemode
== 0)
7239 mddev
->safemode
= 1;
7240 spin_unlock_irq(&mddev
->write_lock
);
7241 md_update_sb(mddev
, 0);
7242 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7244 spin_unlock_irq(&mddev
->write_lock
);
7246 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7251 EXPORT_SYMBOL_GPL(md_allow_write
);
7253 #define SYNC_MARKS 10
7254 #define SYNC_MARK_STEP (3*HZ)
7255 void md_do_sync(struct md_thread
*thread
)
7257 struct mddev
*mddev
= thread
->mddev
;
7258 struct mddev
*mddev2
;
7259 unsigned int currspeed
= 0,
7261 sector_t max_sectors
,j
, io_sectors
;
7262 unsigned long mark
[SYNC_MARKS
];
7263 sector_t mark_cnt
[SYNC_MARKS
];
7265 struct list_head
*tmp
;
7266 sector_t last_check
;
7268 struct md_rdev
*rdev
;
7270 struct blk_plug plug
;
7272 /* just incase thread restarts... */
7273 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7275 if (mddev
->ro
) /* never try to sync a read-only array */
7278 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7279 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
7280 desc
= "data-check";
7281 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7282 desc
= "requested-resync";
7285 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7290 /* we overload curr_resync somewhat here.
7291 * 0 == not engaged in resync at all
7292 * 2 == checking that there is no conflict with another sync
7293 * 1 == like 2, but have yielded to allow conflicting resync to
7295 * other == active in resync - this many blocks
7297 * Before starting a resync we must have set curr_resync to
7298 * 2, and then checked that every "conflicting" array has curr_resync
7299 * less than ours. When we find one that is the same or higher
7300 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7301 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7302 * This will mean we have to start checking from the beginning again.
7307 mddev
->curr_resync
= 2;
7310 if (kthread_should_stop())
7311 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7313 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7315 for_each_mddev(mddev2
, tmp
) {
7316 if (mddev2
== mddev
)
7318 if (!mddev
->parallel_resync
7319 && mddev2
->curr_resync
7320 && match_mddev_units(mddev
, mddev2
)) {
7322 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7323 /* arbitrarily yield */
7324 mddev
->curr_resync
= 1;
7325 wake_up(&resync_wait
);
7327 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7328 /* no need to wait here, we can wait the next
7329 * time 'round when curr_resync == 2
7332 /* We need to wait 'interruptible' so as not to
7333 * contribute to the load average, and not to
7334 * be caught by 'softlockup'
7336 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7337 if (!kthread_should_stop() &&
7338 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7339 printk(KERN_INFO
"md: delaying %s of %s"
7340 " until %s has finished (they"
7341 " share one or more physical units)\n",
7342 desc
, mdname(mddev
), mdname(mddev2
));
7344 if (signal_pending(current
))
7345 flush_signals(current
);
7347 finish_wait(&resync_wait
, &wq
);
7350 finish_wait(&resync_wait
, &wq
);
7353 } while (mddev
->curr_resync
< 2);
7356 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7357 /* resync follows the size requested by the personality,
7358 * which defaults to physical size, but can be virtual size
7360 max_sectors
= mddev
->resync_max_sectors
;
7361 atomic64_set(&mddev
->resync_mismatches
, 0);
7362 /* we don't use the checkpoint if there's a bitmap */
7363 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7364 j
= mddev
->resync_min
;
7365 else if (!mddev
->bitmap
)
7366 j
= mddev
->recovery_cp
;
7368 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7369 max_sectors
= mddev
->resync_max_sectors
;
7371 /* recovery follows the physical size of devices */
7372 max_sectors
= mddev
->dev_sectors
;
7375 rdev_for_each_rcu(rdev
, mddev
)
7376 if (rdev
->raid_disk
>= 0 &&
7377 !test_bit(Faulty
, &rdev
->flags
) &&
7378 !test_bit(In_sync
, &rdev
->flags
) &&
7379 rdev
->recovery_offset
< j
)
7380 j
= rdev
->recovery_offset
;
7384 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7385 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7386 " %d KB/sec/disk.\n", speed_min(mddev
));
7387 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7388 "(but not more than %d KB/sec) for %s.\n",
7389 speed_max(mddev
), desc
);
7391 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7394 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7396 mark_cnt
[m
] = io_sectors
;
7399 mddev
->resync_mark
= mark
[last_mark
];
7400 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7403 * Tune reconstruction:
7405 window
= 32*(PAGE_SIZE
/512);
7406 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7407 window
/2, (unsigned long long)max_sectors
/2);
7409 atomic_set(&mddev
->recovery_active
, 0);
7414 "md: resuming %s of %s from checkpoint.\n",
7415 desc
, mdname(mddev
));
7416 mddev
->curr_resync
= j
;
7418 mddev
->curr_resync_completed
= j
;
7420 blk_start_plug(&plug
);
7421 while (j
< max_sectors
) {
7426 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7427 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7428 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7429 > (max_sectors
>> 4)) ||
7430 (j
- mddev
->curr_resync_completed
)*2
7431 >= mddev
->resync_max
- mddev
->curr_resync_completed
7433 /* time to update curr_resync_completed */
7434 wait_event(mddev
->recovery_wait
,
7435 atomic_read(&mddev
->recovery_active
) == 0);
7436 mddev
->curr_resync_completed
= j
;
7437 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7438 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7441 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
7442 /* As this condition is controlled by user-space,
7443 * we can block indefinitely, so use '_interruptible'
7444 * to avoid triggering warnings.
7446 flush_signals(current
); /* just in case */
7447 wait_event_interruptible(mddev
->recovery_wait
,
7448 mddev
->resync_max
> j
7449 || kthread_should_stop());
7452 if (kthread_should_stop())
7455 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7456 currspeed
< speed_min(mddev
));
7458 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7462 if (!skipped
) { /* actual IO requested */
7463 io_sectors
+= sectors
;
7464 atomic_add(sectors
, &mddev
->recovery_active
);
7467 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7471 if (j
>1) mddev
->curr_resync
= j
;
7472 mddev
->curr_mark_cnt
= io_sectors
;
7473 if (last_check
== 0)
7474 /* this is the earliest that rebuild will be
7475 * visible in /proc/mdstat
7477 md_new_event(mddev
);
7479 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7482 last_check
= io_sectors
;
7484 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7486 int next
= (last_mark
+1) % SYNC_MARKS
;
7488 mddev
->resync_mark
= mark
[next
];
7489 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7490 mark
[next
] = jiffies
;
7491 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7496 if (kthread_should_stop())
7501 * this loop exits only if either when we are slower than
7502 * the 'hard' speed limit, or the system was IO-idle for
7504 * the system might be non-idle CPU-wise, but we only care
7505 * about not overloading the IO subsystem. (things like an
7506 * e2fsck being done on the RAID array should execute fast)
7510 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7511 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7513 if (currspeed
> speed_min(mddev
)) {
7514 if ((currspeed
> speed_max(mddev
)) ||
7515 !is_mddev_idle(mddev
, 0)) {
7521 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7523 * this also signals 'finished resyncing' to md_stop
7526 blk_finish_plug(&plug
);
7527 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7529 /* tell personality that we are finished */
7530 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7532 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7533 mddev
->curr_resync
> 2) {
7534 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7535 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7536 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7538 "md: checkpointing %s of %s.\n",
7539 desc
, mdname(mddev
));
7540 mddev
->recovery_cp
=
7541 mddev
->curr_resync_completed
;
7544 mddev
->recovery_cp
= MaxSector
;
7546 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7547 mddev
->curr_resync
= MaxSector
;
7549 rdev_for_each_rcu(rdev
, mddev
)
7550 if (rdev
->raid_disk
>= 0 &&
7551 mddev
->delta_disks
>= 0 &&
7552 !test_bit(Faulty
, &rdev
->flags
) &&
7553 !test_bit(In_sync
, &rdev
->flags
) &&
7554 rdev
->recovery_offset
< mddev
->curr_resync
)
7555 rdev
->recovery_offset
= mddev
->curr_resync
;
7560 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7562 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7563 /* We completed so min/max setting can be forgotten if used. */
7564 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7565 mddev
->resync_min
= 0;
7566 mddev
->resync_max
= MaxSector
;
7567 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7568 mddev
->resync_min
= mddev
->curr_resync_completed
;
7569 mddev
->curr_resync
= 0;
7570 wake_up(&resync_wait
);
7571 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7572 md_wakeup_thread(mddev
->thread
);
7577 * got a signal, exit.
7580 "md: md_do_sync() got signal ... exiting\n");
7581 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7585 EXPORT_SYMBOL_GPL(md_do_sync
);
7587 static int remove_and_add_spares(struct mddev
*mddev
)
7589 struct md_rdev
*rdev
;
7593 mddev
->curr_resync_completed
= 0;
7595 rdev_for_each(rdev
, mddev
)
7596 if (rdev
->raid_disk
>= 0 &&
7597 !test_bit(Blocked
, &rdev
->flags
) &&
7598 (test_bit(Faulty
, &rdev
->flags
) ||
7599 ! test_bit(In_sync
, &rdev
->flags
)) &&
7600 atomic_read(&rdev
->nr_pending
)==0) {
7601 if (mddev
->pers
->hot_remove_disk(
7602 mddev
, rdev
) == 0) {
7603 sysfs_unlink_rdev(mddev
, rdev
);
7604 rdev
->raid_disk
= -1;
7609 sysfs_notify(&mddev
->kobj
, NULL
,
7613 rdev_for_each(rdev
, mddev
) {
7614 if (rdev
->raid_disk
>= 0 &&
7615 !test_bit(In_sync
, &rdev
->flags
) &&
7616 !test_bit(Faulty
, &rdev
->flags
))
7618 if (rdev
->raid_disk
< 0
7619 && !test_bit(Faulty
, &rdev
->flags
)) {
7620 rdev
->recovery_offset
= 0;
7622 hot_add_disk(mddev
, rdev
) == 0) {
7623 if (sysfs_link_rdev(mddev
, rdev
))
7624 /* failure here is OK */;
7626 md_new_event(mddev
);
7627 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7634 static void reap_sync_thread(struct mddev
*mddev
)
7636 struct md_rdev
*rdev
;
7638 /* resync has finished, collect result */
7639 md_unregister_thread(&mddev
->sync_thread
);
7640 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7641 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7643 /* activate any spares */
7644 if (mddev
->pers
->spare_active(mddev
))
7645 sysfs_notify(&mddev
->kobj
, NULL
,
7648 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7649 mddev
->pers
->finish_reshape
)
7650 mddev
->pers
->finish_reshape(mddev
);
7652 /* If array is no-longer degraded, then any saved_raid_disk
7653 * information must be scrapped. Also if any device is now
7654 * In_sync we must scrape the saved_raid_disk for that device
7655 * do the superblock for an incrementally recovered device
7658 rdev_for_each(rdev
, mddev
)
7659 if (!mddev
->degraded
||
7660 test_bit(In_sync
, &rdev
->flags
))
7661 rdev
->saved_raid_disk
= -1;
7663 md_update_sb(mddev
, 1);
7664 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7665 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7666 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7667 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7668 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7669 /* flag recovery needed just to double check */
7670 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7671 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7672 md_new_event(mddev
);
7673 if (mddev
->event_work
.func
)
7674 queue_work(md_misc_wq
, &mddev
->event_work
);
7678 * This routine is regularly called by all per-raid-array threads to
7679 * deal with generic issues like resync and super-block update.
7680 * Raid personalities that don't have a thread (linear/raid0) do not
7681 * need this as they never do any recovery or update the superblock.
7683 * It does not do any resync itself, but rather "forks" off other threads
7684 * to do that as needed.
7685 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7686 * "->recovery" and create a thread at ->sync_thread.
7687 * When the thread finishes it sets MD_RECOVERY_DONE
7688 * and wakeups up this thread which will reap the thread and finish up.
7689 * This thread also removes any faulty devices (with nr_pending == 0).
7691 * The overall approach is:
7692 * 1/ if the superblock needs updating, update it.
7693 * 2/ If a recovery thread is running, don't do anything else.
7694 * 3/ If recovery has finished, clean up, possibly marking spares active.
7695 * 4/ If there are any faulty devices, remove them.
7696 * 5/ If array is degraded, try to add spares devices
7697 * 6/ If array has spares or is not in-sync, start a resync thread.
7699 void md_check_recovery(struct mddev
*mddev
)
7701 if (mddev
->suspended
)
7705 bitmap_daemon_work(mddev
);
7707 if (signal_pending(current
)) {
7708 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7709 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7711 mddev
->safemode
= 2;
7713 flush_signals(current
);
7716 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7719 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7720 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7721 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7722 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7723 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7724 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7728 if (mddev_trylock(mddev
)) {
7732 /* Only thing we do on a ro array is remove
7735 struct md_rdev
*rdev
;
7736 rdev_for_each(rdev
, mddev
)
7737 if (rdev
->raid_disk
>= 0 &&
7738 !test_bit(Blocked
, &rdev
->flags
) &&
7739 test_bit(Faulty
, &rdev
->flags
) &&
7740 atomic_read(&rdev
->nr_pending
)==0) {
7741 if (mddev
->pers
->hot_remove_disk(
7742 mddev
, rdev
) == 0) {
7743 sysfs_unlink_rdev(mddev
, rdev
);
7744 rdev
->raid_disk
= -1;
7747 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7751 if (!mddev
->external
) {
7753 spin_lock_irq(&mddev
->write_lock
);
7754 if (mddev
->safemode
&&
7755 !atomic_read(&mddev
->writes_pending
) &&
7757 mddev
->recovery_cp
== MaxSector
) {
7760 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7762 if (mddev
->safemode
== 1)
7763 mddev
->safemode
= 0;
7764 spin_unlock_irq(&mddev
->write_lock
);
7766 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7770 md_update_sb(mddev
, 0);
7772 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7773 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7774 /* resync/recovery still happening */
7775 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7778 if (mddev
->sync_thread
) {
7779 reap_sync_thread(mddev
);
7782 /* Set RUNNING before clearing NEEDED to avoid
7783 * any transients in the value of "sync_action".
7785 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7786 /* Clear some bits that don't mean anything, but
7789 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7790 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7792 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7793 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7795 /* no recovery is running.
7796 * remove any failed drives, then
7797 * add spares if possible.
7798 * Spare are also removed and re-added, to allow
7799 * the personality to fail the re-add.
7802 if (mddev
->reshape_position
!= MaxSector
) {
7803 if (mddev
->pers
->check_reshape
== NULL
||
7804 mddev
->pers
->check_reshape(mddev
) != 0)
7805 /* Cannot proceed */
7807 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7808 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7809 } else if ((spares
= remove_and_add_spares(mddev
))) {
7810 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7811 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7812 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7813 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7814 } else if (mddev
->recovery_cp
< MaxSector
) {
7815 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7816 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7817 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7818 /* nothing to be done ... */
7821 if (mddev
->pers
->sync_request
) {
7823 /* We are adding a device or devices to an array
7824 * which has the bitmap stored on all devices.
7825 * So make sure all bitmap pages get written
7827 bitmap_write_all(mddev
->bitmap
);
7829 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7832 if (!mddev
->sync_thread
) {
7833 printk(KERN_ERR
"%s: could not start resync"
7836 /* leave the spares where they are, it shouldn't hurt */
7837 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7838 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7839 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7840 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7841 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7843 md_wakeup_thread(mddev
->sync_thread
);
7844 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7845 md_new_event(mddev
);
7848 if (!mddev
->sync_thread
) {
7849 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7850 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7852 if (mddev
->sysfs_action
)
7853 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7855 mddev_unlock(mddev
);
7859 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7861 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7862 wait_event_timeout(rdev
->blocked_wait
,
7863 !test_bit(Blocked
, &rdev
->flags
) &&
7864 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7865 msecs_to_jiffies(5000));
7866 rdev_dec_pending(rdev
, mddev
);
7868 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7870 void md_finish_reshape(struct mddev
*mddev
)
7872 /* called be personality module when reshape completes. */
7873 struct md_rdev
*rdev
;
7875 rdev_for_each(rdev
, mddev
) {
7876 if (rdev
->data_offset
> rdev
->new_data_offset
)
7877 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7879 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7880 rdev
->data_offset
= rdev
->new_data_offset
;
7883 EXPORT_SYMBOL(md_finish_reshape
);
7885 /* Bad block management.
7886 * We can record which blocks on each device are 'bad' and so just
7887 * fail those blocks, or that stripe, rather than the whole device.
7888 * Entries in the bad-block table are 64bits wide. This comprises:
7889 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7890 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7891 * A 'shift' can be set so that larger blocks are tracked and
7892 * consequently larger devices can be covered.
7893 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7895 * Locking of the bad-block table uses a seqlock so md_is_badblock
7896 * might need to retry if it is very unlucky.
7897 * We will sometimes want to check for bad blocks in a bi_end_io function,
7898 * so we use the write_seqlock_irq variant.
7900 * When looking for a bad block we specify a range and want to
7901 * know if any block in the range is bad. So we binary-search
7902 * to the last range that starts at-or-before the given endpoint,
7903 * (or "before the sector after the target range")
7904 * then see if it ends after the given start.
7906 * 0 if there are no known bad blocks in the range
7907 * 1 if there are known bad block which are all acknowledged
7908 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7909 * plus the start/length of the first bad section we overlap.
7911 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7912 sector_t
*first_bad
, int *bad_sectors
)
7918 sector_t target
= s
+ sectors
;
7921 if (bb
->shift
> 0) {
7922 /* round the start down, and the end up */
7924 target
+= (1<<bb
->shift
) - 1;
7925 target
>>= bb
->shift
;
7926 sectors
= target
- s
;
7928 /* 'target' is now the first block after the bad range */
7931 seq
= read_seqbegin(&bb
->lock
);
7935 /* Binary search between lo and hi for 'target'
7936 * i.e. for the last range that starts before 'target'
7938 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7939 * are known not to be the last range before target.
7940 * VARIANT: hi-lo is the number of possible
7941 * ranges, and decreases until it reaches 1
7943 while (hi
- lo
> 1) {
7944 int mid
= (lo
+ hi
) / 2;
7945 sector_t a
= BB_OFFSET(p
[mid
]);
7947 /* This could still be the one, earlier ranges
7951 /* This and later ranges are definitely out. */
7954 /* 'lo' might be the last that started before target, but 'hi' isn't */
7956 /* need to check all range that end after 's' to see if
7957 * any are unacknowledged.
7960 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7961 if (BB_OFFSET(p
[lo
]) < target
) {
7962 /* starts before the end, and finishes after
7963 * the start, so they must overlap
7965 if (rv
!= -1 && BB_ACK(p
[lo
]))
7969 *first_bad
= BB_OFFSET(p
[lo
]);
7970 *bad_sectors
= BB_LEN(p
[lo
]);
7976 if (read_seqretry(&bb
->lock
, seq
))
7981 EXPORT_SYMBOL_GPL(md_is_badblock
);
7984 * Add a range of bad blocks to the table.
7985 * This might extend the table, or might contract it
7986 * if two adjacent ranges can be merged.
7987 * We binary-search to find the 'insertion' point, then
7988 * decide how best to handle it.
7990 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
7998 /* badblocks are disabled */
8002 /* round the start down, and the end up */
8003 sector_t next
= s
+ sectors
;
8005 next
+= (1<<bb
->shift
) - 1;
8010 write_seqlock_irq(&bb
->lock
);
8015 /* Find the last range that starts at-or-before 's' */
8016 while (hi
- lo
> 1) {
8017 int mid
= (lo
+ hi
) / 2;
8018 sector_t a
= BB_OFFSET(p
[mid
]);
8024 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8028 /* we found a range that might merge with the start
8031 sector_t a
= BB_OFFSET(p
[lo
]);
8032 sector_t e
= a
+ BB_LEN(p
[lo
]);
8033 int ack
= BB_ACK(p
[lo
]);
8035 /* Yes, we can merge with a previous range */
8036 if (s
== a
&& s
+ sectors
>= e
)
8037 /* new range covers old */
8040 ack
= ack
&& acknowledged
;
8042 if (e
< s
+ sectors
)
8044 if (e
- a
<= BB_MAX_LEN
) {
8045 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8048 /* does not all fit in one range,
8049 * make p[lo] maximal
8051 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8052 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8058 if (sectors
&& hi
< bb
->count
) {
8059 /* 'hi' points to the first range that starts after 's'.
8060 * Maybe we can merge with the start of that range */
8061 sector_t a
= BB_OFFSET(p
[hi
]);
8062 sector_t e
= a
+ BB_LEN(p
[hi
]);
8063 int ack
= BB_ACK(p
[hi
]);
8064 if (a
<= s
+ sectors
) {
8065 /* merging is possible */
8066 if (e
<= s
+ sectors
) {
8071 ack
= ack
&& acknowledged
;
8074 if (e
- a
<= BB_MAX_LEN
) {
8075 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8078 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8086 if (sectors
== 0 && hi
< bb
->count
) {
8087 /* we might be able to combine lo and hi */
8088 /* Note: 's' is at the end of 'lo' */
8089 sector_t a
= BB_OFFSET(p
[hi
]);
8090 int lolen
= BB_LEN(p
[lo
]);
8091 int hilen
= BB_LEN(p
[hi
]);
8092 int newlen
= lolen
+ hilen
- (s
- a
);
8093 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8094 /* yes, we can combine them */
8095 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8096 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8097 memmove(p
+ hi
, p
+ hi
+ 1,
8098 (bb
->count
- hi
- 1) * 8);
8103 /* didn't merge (it all).
8104 * Need to add a range just before 'hi' */
8105 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8106 /* No room for more */
8110 int this_sectors
= sectors
;
8111 memmove(p
+ hi
+ 1, p
+ hi
,
8112 (bb
->count
- hi
) * 8);
8115 if (this_sectors
> BB_MAX_LEN
)
8116 this_sectors
= BB_MAX_LEN
;
8117 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8118 sectors
-= this_sectors
;
8125 bb
->unacked_exist
= 1;
8126 write_sequnlock_irq(&bb
->lock
);
8131 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8136 s
+= rdev
->new_data_offset
;
8138 s
+= rdev
->data_offset
;
8139 rv
= md_set_badblocks(&rdev
->badblocks
,
8142 /* Make sure they get written out promptly */
8143 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8144 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8145 md_wakeup_thread(rdev
->mddev
->thread
);
8149 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8152 * Remove a range of bad blocks from the table.
8153 * This may involve extending the table if we spilt a region,
8154 * but it must not fail. So if the table becomes full, we just
8155 * drop the remove request.
8157 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8161 sector_t target
= s
+ sectors
;
8164 if (bb
->shift
> 0) {
8165 /* When clearing we round the start up and the end down.
8166 * This should not matter as the shift should align with
8167 * the block size and no rounding should ever be needed.
8168 * However it is better the think a block is bad when it
8169 * isn't than to think a block is not bad when it is.
8171 s
+= (1<<bb
->shift
) - 1;
8173 target
>>= bb
->shift
;
8174 sectors
= target
- s
;
8177 write_seqlock_irq(&bb
->lock
);
8182 /* Find the last range that starts before 'target' */
8183 while (hi
- lo
> 1) {
8184 int mid
= (lo
+ hi
) / 2;
8185 sector_t a
= BB_OFFSET(p
[mid
]);
8192 /* p[lo] is the last range that could overlap the
8193 * current range. Earlier ranges could also overlap,
8194 * but only this one can overlap the end of the range.
8196 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8197 /* Partial overlap, leave the tail of this range */
8198 int ack
= BB_ACK(p
[lo
]);
8199 sector_t a
= BB_OFFSET(p
[lo
]);
8200 sector_t end
= a
+ BB_LEN(p
[lo
]);
8203 /* we need to split this range */
8204 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8208 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8210 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8213 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8214 /* there is no longer an overlap */
8219 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8220 /* This range does overlap */
8221 if (BB_OFFSET(p
[lo
]) < s
) {
8222 /* Keep the early parts of this range. */
8223 int ack
= BB_ACK(p
[lo
]);
8224 sector_t start
= BB_OFFSET(p
[lo
]);
8225 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8226 /* now low doesn't overlap, so.. */
8231 /* 'lo' is strictly before, 'hi' is strictly after,
8232 * anything between needs to be discarded
8235 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8236 bb
->count
-= (hi
- lo
- 1);
8242 write_sequnlock_irq(&bb
->lock
);
8246 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8250 s
+= rdev
->new_data_offset
;
8252 s
+= rdev
->data_offset
;
8253 return md_clear_badblocks(&rdev
->badblocks
,
8256 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8259 * Acknowledge all bad blocks in a list.
8260 * This only succeeds if ->changed is clear. It is used by
8261 * in-kernel metadata updates
8263 void md_ack_all_badblocks(struct badblocks
*bb
)
8265 if (bb
->page
== NULL
|| bb
->changed
)
8266 /* no point even trying */
8268 write_seqlock_irq(&bb
->lock
);
8270 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8273 for (i
= 0; i
< bb
->count
; i
++) {
8274 if (!BB_ACK(p
[i
])) {
8275 sector_t start
= BB_OFFSET(p
[i
]);
8276 int len
= BB_LEN(p
[i
]);
8277 p
[i
] = BB_MAKE(start
, len
, 1);
8280 bb
->unacked_exist
= 0;
8282 write_sequnlock_irq(&bb
->lock
);
8284 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8286 /* sysfs access to bad-blocks list.
8287 * We present two files.
8288 * 'bad-blocks' lists sector numbers and lengths of ranges that
8289 * are recorded as bad. The list is truncated to fit within
8290 * the one-page limit of sysfs.
8291 * Writing "sector length" to this file adds an acknowledged
8293 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8294 * been acknowledged. Writing to this file adds bad blocks
8295 * without acknowledging them. This is largely for testing.
8299 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8310 seq
= read_seqbegin(&bb
->lock
);
8315 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8316 sector_t s
= BB_OFFSET(p
[i
]);
8317 unsigned int length
= BB_LEN(p
[i
]);
8318 int ack
= BB_ACK(p
[i
]);
8324 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8325 (unsigned long long)s
<< bb
->shift
,
8326 length
<< bb
->shift
);
8328 if (unack
&& len
== 0)
8329 bb
->unacked_exist
= 0;
8331 if (read_seqretry(&bb
->lock
, seq
))
8340 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8342 unsigned long long sector
;
8346 /* Allow clearing via sysfs *only* for testing/debugging.
8347 * Normally only a successful write may clear a badblock
8350 if (page
[0] == '-') {
8354 #endif /* DO_DEBUG */
8356 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8358 if (newline
!= '\n')
8370 md_clear_badblocks(bb
, sector
, length
);
8373 #endif /* DO_DEBUG */
8374 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8380 static int md_notify_reboot(struct notifier_block
*this,
8381 unsigned long code
, void *x
)
8383 struct list_head
*tmp
;
8384 struct mddev
*mddev
;
8387 for_each_mddev(mddev
, tmp
) {
8388 if (mddev_trylock(mddev
)) {
8390 __md_stop_writes(mddev
);
8391 mddev
->safemode
= 2;
8392 mddev_unlock(mddev
);
8397 * certain more exotic SCSI devices are known to be
8398 * volatile wrt too early system reboots. While the
8399 * right place to handle this issue is the given
8400 * driver, we do want to have a safe RAID driver ...
8408 static struct notifier_block md_notifier
= {
8409 .notifier_call
= md_notify_reboot
,
8411 .priority
= INT_MAX
, /* before any real devices */
8414 static void md_geninit(void)
8416 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8418 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8421 static int __init
md_init(void)
8425 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8429 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8433 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8436 if ((ret
= register_blkdev(0, "mdp")) < 0)
8440 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8441 md_probe
, NULL
, NULL
);
8442 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8443 md_probe
, NULL
, NULL
);
8445 register_reboot_notifier(&md_notifier
);
8446 raid_table_header
= register_sysctl_table(raid_root_table
);
8452 unregister_blkdev(MD_MAJOR
, "md");
8454 destroy_workqueue(md_misc_wq
);
8456 destroy_workqueue(md_wq
);
8464 * Searches all registered partitions for autorun RAID arrays
8468 static LIST_HEAD(all_detected_devices
);
8469 struct detected_devices_node
{
8470 struct list_head list
;
8474 void md_autodetect_dev(dev_t dev
)
8476 struct detected_devices_node
*node_detected_dev
;
8478 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8479 if (node_detected_dev
) {
8480 node_detected_dev
->dev
= dev
;
8481 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8483 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8484 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8489 static void autostart_arrays(int part
)
8491 struct md_rdev
*rdev
;
8492 struct detected_devices_node
*node_detected_dev
;
8494 int i_scanned
, i_passed
;
8499 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8501 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8503 node_detected_dev
= list_entry(all_detected_devices
.next
,
8504 struct detected_devices_node
, list
);
8505 list_del(&node_detected_dev
->list
);
8506 dev
= node_detected_dev
->dev
;
8507 kfree(node_detected_dev
);
8508 rdev
= md_import_device(dev
,0, 90);
8512 if (test_bit(Faulty
, &rdev
->flags
)) {
8516 set_bit(AutoDetected
, &rdev
->flags
);
8517 list_add(&rdev
->same_set
, &pending_raid_disks
);
8521 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8522 i_scanned
, i_passed
);
8524 autorun_devices(part
);
8527 #endif /* !MODULE */
8529 static __exit
void md_exit(void)
8531 struct mddev
*mddev
;
8532 struct list_head
*tmp
;
8534 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8535 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8537 unregister_blkdev(MD_MAJOR
,"md");
8538 unregister_blkdev(mdp_major
, "mdp");
8539 unregister_reboot_notifier(&md_notifier
);
8540 unregister_sysctl_table(raid_table_header
);
8541 remove_proc_entry("mdstat", NULL
);
8542 for_each_mddev(mddev
, tmp
) {
8543 export_array(mddev
);
8544 mddev
->hold_active
= 0;
8546 destroy_workqueue(md_misc_wq
);
8547 destroy_workqueue(md_wq
);
8550 subsys_initcall(md_init
);
8551 module_exit(md_exit
)
8553 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8555 return sprintf(buffer
, "%d", start_readonly
);
8557 static int set_ro(const char *val
, struct kernel_param
*kp
)
8560 int num
= simple_strtoul(val
, &e
, 10);
8561 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8562 start_readonly
= num
;
8568 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8569 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8571 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8573 EXPORT_SYMBOL(register_md_personality
);
8574 EXPORT_SYMBOL(unregister_md_personality
);
8575 EXPORT_SYMBOL(md_error
);
8576 EXPORT_SYMBOL(md_done_sync
);
8577 EXPORT_SYMBOL(md_write_start
);
8578 EXPORT_SYMBOL(md_write_end
);
8579 EXPORT_SYMBOL(md_register_thread
);
8580 EXPORT_SYMBOL(md_unregister_thread
);
8581 EXPORT_SYMBOL(md_wakeup_thread
);
8582 EXPORT_SYMBOL(md_check_recovery
);
8583 MODULE_LICENSE("GPL");
8584 MODULE_DESCRIPTION("MD RAID framework");
8586 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);