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
,
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
;
1418 disk_csum
= sb
->sb_csum
;
1421 for (; size
>= 4; size
-= 4)
1422 newcsum
+= le32_to_cpu(*isuper
++);
1425 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1427 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1428 sb
->sb_csum
= disk_csum
;
1429 return cpu_to_le32(csum
);
1432 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1434 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1436 struct mdp_superblock_1
*sb
;
1440 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1444 * Calculate the position of the superblock in 512byte sectors.
1445 * It is always aligned to a 4K boundary and
1446 * depeding on minor_version, it can be:
1447 * 0: At least 8K, but less than 12K, from end of device
1448 * 1: At start of device
1449 * 2: 4K from start of device.
1451 switch(minor_version
) {
1453 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1455 sb_start
&= ~(sector_t
)(4*2-1);
1466 rdev
->sb_start
= sb_start
;
1468 /* superblock is rarely larger than 1K, but it can be larger,
1469 * and it is safe to read 4k, so we do that
1471 ret
= read_disk_sb(rdev
, 4096);
1472 if (ret
) return ret
;
1475 sb
= page_address(rdev
->sb_page
);
1477 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1478 sb
->major_version
!= cpu_to_le32(1) ||
1479 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1480 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1481 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1484 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1485 printk("md: invalid superblock checksum on %s\n",
1486 bdevname(rdev
->bdev
,b
));
1489 if (le64_to_cpu(sb
->data_size
) < 10) {
1490 printk("md: data_size too small on %s\n",
1491 bdevname(rdev
->bdev
,b
));
1496 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1497 /* Some padding is non-zero, might be a new feature */
1500 rdev
->preferred_minor
= 0xffff;
1501 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1502 rdev
->new_data_offset
= rdev
->data_offset
;
1503 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1504 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1505 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1506 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1508 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1509 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1510 if (rdev
->sb_size
& bmask
)
1511 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1514 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1517 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1520 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1523 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1525 if (!rdev
->bb_page
) {
1526 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1530 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1531 rdev
->badblocks
.count
== 0) {
1532 /* need to load the bad block list.
1533 * Currently we limit it to one page.
1539 int sectors
= le16_to_cpu(sb
->bblog_size
);
1540 if (sectors
> (PAGE_SIZE
/ 512))
1542 offset
= le32_to_cpu(sb
->bblog_offset
);
1545 bb_sector
= (long long)offset
;
1546 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1547 rdev
->bb_page
, READ
, true))
1549 bbp
= (u64
*)page_address(rdev
->bb_page
);
1550 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1551 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1552 u64 bb
= le64_to_cpu(*bbp
);
1553 int count
= bb
& (0x3ff);
1554 u64 sector
= bb
>> 10;
1555 sector
<<= sb
->bblog_shift
;
1556 count
<<= sb
->bblog_shift
;
1559 if (md_set_badblocks(&rdev
->badblocks
,
1560 sector
, count
, 1) == 0)
1563 } else if (sb
->bblog_offset
== 0)
1564 rdev
->badblocks
.shift
= -1;
1570 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1572 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1573 sb
->level
!= refsb
->level
||
1574 sb
->layout
!= refsb
->layout
||
1575 sb
->chunksize
!= refsb
->chunksize
) {
1576 printk(KERN_WARNING
"md: %s has strangely different"
1577 " superblock to %s\n",
1578 bdevname(rdev
->bdev
,b
),
1579 bdevname(refdev
->bdev
,b2
));
1582 ev1
= le64_to_cpu(sb
->events
);
1583 ev2
= le64_to_cpu(refsb
->events
);
1590 if (minor_version
) {
1591 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1592 sectors
-= rdev
->data_offset
;
1594 sectors
= rdev
->sb_start
;
1595 if (sectors
< le64_to_cpu(sb
->data_size
))
1597 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1601 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1603 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1604 __u64 ev1
= le64_to_cpu(sb
->events
);
1606 rdev
->raid_disk
= -1;
1607 clear_bit(Faulty
, &rdev
->flags
);
1608 clear_bit(In_sync
, &rdev
->flags
);
1609 clear_bit(WriteMostly
, &rdev
->flags
);
1611 if (mddev
->raid_disks
== 0) {
1612 mddev
->major_version
= 1;
1613 mddev
->patch_version
= 0;
1614 mddev
->external
= 0;
1615 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1616 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1617 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1618 mddev
->level
= le32_to_cpu(sb
->level
);
1619 mddev
->clevel
[0] = 0;
1620 mddev
->layout
= le32_to_cpu(sb
->layout
);
1621 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1622 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1623 mddev
->events
= ev1
;
1624 mddev
->bitmap_info
.offset
= 0;
1625 mddev
->bitmap_info
.space
= 0;
1626 /* Default location for bitmap is 1K after superblock
1627 * using 3K - total of 4K
1629 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1630 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1631 mddev
->reshape_backwards
= 0;
1633 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1634 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1636 mddev
->max_disks
= (4096-256)/2;
1638 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1639 mddev
->bitmap_info
.file
== NULL
) {
1640 mddev
->bitmap_info
.offset
=
1641 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1642 /* Metadata doesn't record how much space is available.
1643 * For 1.0, we assume we can use up to the superblock
1644 * if before, else to 4K beyond superblock.
1645 * For others, assume no change is possible.
1647 if (mddev
->minor_version
> 0)
1648 mddev
->bitmap_info
.space
= 0;
1649 else if (mddev
->bitmap_info
.offset
> 0)
1650 mddev
->bitmap_info
.space
=
1651 8 - mddev
->bitmap_info
.offset
;
1653 mddev
->bitmap_info
.space
=
1654 -mddev
->bitmap_info
.offset
;
1657 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1658 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1659 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1660 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1661 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1662 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1663 if (mddev
->delta_disks
< 0 ||
1664 (mddev
->delta_disks
== 0 &&
1665 (le32_to_cpu(sb
->feature_map
)
1666 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1667 mddev
->reshape_backwards
= 1;
1669 mddev
->reshape_position
= MaxSector
;
1670 mddev
->delta_disks
= 0;
1671 mddev
->new_level
= mddev
->level
;
1672 mddev
->new_layout
= mddev
->layout
;
1673 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1676 } else if (mddev
->pers
== NULL
) {
1677 /* Insist of good event counter while assembling, except for
1678 * spares (which don't need an event count) */
1680 if (rdev
->desc_nr
>= 0 &&
1681 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1682 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1683 if (ev1
< mddev
->events
)
1685 } else if (mddev
->bitmap
) {
1686 /* If adding to array with a bitmap, then we can accept an
1687 * older device, but not too old.
1689 if (ev1
< mddev
->bitmap
->events_cleared
)
1692 if (ev1
< mddev
->events
)
1693 /* just a hot-add of a new device, leave raid_disk at -1 */
1696 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1698 if (rdev
->desc_nr
< 0 ||
1699 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1703 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1705 case 0xffff: /* spare */
1707 case 0xfffe: /* faulty */
1708 set_bit(Faulty
, &rdev
->flags
);
1711 if ((le32_to_cpu(sb
->feature_map
) &
1712 MD_FEATURE_RECOVERY_OFFSET
))
1713 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1715 set_bit(In_sync
, &rdev
->flags
);
1716 rdev
->raid_disk
= role
;
1719 if (sb
->devflags
& WriteMostly1
)
1720 set_bit(WriteMostly
, &rdev
->flags
);
1721 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1722 set_bit(Replacement
, &rdev
->flags
);
1723 } else /* MULTIPATH are always insync */
1724 set_bit(In_sync
, &rdev
->flags
);
1729 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1731 struct mdp_superblock_1
*sb
;
1732 struct md_rdev
*rdev2
;
1734 /* make rdev->sb match mddev and rdev data. */
1736 sb
= page_address(rdev
->sb_page
);
1738 sb
->feature_map
= 0;
1740 sb
->recovery_offset
= cpu_to_le64(0);
1741 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1743 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1744 sb
->events
= cpu_to_le64(mddev
->events
);
1746 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1748 sb
->resync_offset
= cpu_to_le64(0);
1750 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1752 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1753 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1754 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1755 sb
->level
= cpu_to_le32(mddev
->level
);
1756 sb
->layout
= cpu_to_le32(mddev
->layout
);
1758 if (test_bit(WriteMostly
, &rdev
->flags
))
1759 sb
->devflags
|= WriteMostly1
;
1761 sb
->devflags
&= ~WriteMostly1
;
1762 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1763 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1765 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1766 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1767 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1770 if (rdev
->raid_disk
>= 0 &&
1771 !test_bit(In_sync
, &rdev
->flags
)) {
1773 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1774 sb
->recovery_offset
=
1775 cpu_to_le64(rdev
->recovery_offset
);
1777 if (test_bit(Replacement
, &rdev
->flags
))
1779 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1781 if (mddev
->reshape_position
!= MaxSector
) {
1782 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1783 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1784 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1785 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1786 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1787 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1788 if (mddev
->delta_disks
== 0 &&
1789 mddev
->reshape_backwards
)
1791 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1792 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1794 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1795 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1796 - rdev
->data_offset
));
1800 if (rdev
->badblocks
.count
== 0)
1801 /* Nothing to do for bad blocks*/ ;
1802 else if (sb
->bblog_offset
== 0)
1803 /* Cannot record bad blocks on this device */
1804 md_error(mddev
, rdev
);
1806 struct badblocks
*bb
= &rdev
->badblocks
;
1807 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1809 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1814 seq
= read_seqbegin(&bb
->lock
);
1816 memset(bbp
, 0xff, PAGE_SIZE
);
1818 for (i
= 0 ; i
< bb
->count
; i
++) {
1819 u64 internal_bb
= p
[i
];
1820 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1821 | BB_LEN(internal_bb
));
1822 bbp
[i
] = cpu_to_le64(store_bb
);
1825 if (read_seqretry(&bb
->lock
, seq
))
1828 bb
->sector
= (rdev
->sb_start
+
1829 (int)le32_to_cpu(sb
->bblog_offset
));
1830 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1835 rdev_for_each(rdev2
, mddev
)
1836 if (rdev2
->desc_nr
+1 > max_dev
)
1837 max_dev
= rdev2
->desc_nr
+1;
1839 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1841 sb
->max_dev
= cpu_to_le32(max_dev
);
1842 rdev
->sb_size
= max_dev
* 2 + 256;
1843 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1844 if (rdev
->sb_size
& bmask
)
1845 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1847 max_dev
= le32_to_cpu(sb
->max_dev
);
1849 for (i
=0; i
<max_dev
;i
++)
1850 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1852 rdev_for_each(rdev2
, mddev
) {
1854 if (test_bit(Faulty
, &rdev2
->flags
))
1855 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1856 else if (test_bit(In_sync
, &rdev2
->flags
))
1857 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1858 else if (rdev2
->raid_disk
>= 0)
1859 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1861 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1864 sb
->sb_csum
= calc_sb_1_csum(sb
);
1867 static unsigned long long
1868 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1870 struct mdp_superblock_1
*sb
;
1871 sector_t max_sectors
;
1872 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1873 return 0; /* component must fit device */
1874 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1875 return 0; /* too confusing */
1876 if (rdev
->sb_start
< rdev
->data_offset
) {
1877 /* minor versions 1 and 2; superblock before data */
1878 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1879 max_sectors
-= rdev
->data_offset
;
1880 if (!num_sectors
|| num_sectors
> max_sectors
)
1881 num_sectors
= max_sectors
;
1882 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1883 /* minor version 0 with bitmap we can't move */
1886 /* minor version 0; superblock after data */
1888 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1889 sb_start
&= ~(sector_t
)(4*2 - 1);
1890 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1891 if (!num_sectors
|| num_sectors
> max_sectors
)
1892 num_sectors
= max_sectors
;
1893 rdev
->sb_start
= sb_start
;
1895 sb
= page_address(rdev
->sb_page
);
1896 sb
->data_size
= cpu_to_le64(num_sectors
);
1897 sb
->super_offset
= rdev
->sb_start
;
1898 sb
->sb_csum
= calc_sb_1_csum(sb
);
1899 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1901 md_super_wait(rdev
->mddev
);
1907 super_1_allow_new_offset(struct md_rdev
*rdev
,
1908 unsigned long long new_offset
)
1910 /* All necessary checks on new >= old have been done */
1911 struct bitmap
*bitmap
;
1912 if (new_offset
>= rdev
->data_offset
)
1915 /* with 1.0 metadata, there is no metadata to tread on
1916 * so we can always move back */
1917 if (rdev
->mddev
->minor_version
== 0)
1920 /* otherwise we must be sure not to step on
1921 * any metadata, so stay:
1922 * 36K beyond start of superblock
1923 * beyond end of badblocks
1924 * beyond write-intent bitmap
1926 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1928 bitmap
= rdev
->mddev
->bitmap
;
1929 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1930 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1931 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1933 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1939 static struct super_type super_types
[] = {
1942 .owner
= THIS_MODULE
,
1943 .load_super
= super_90_load
,
1944 .validate_super
= super_90_validate
,
1945 .sync_super
= super_90_sync
,
1946 .rdev_size_change
= super_90_rdev_size_change
,
1947 .allow_new_offset
= super_90_allow_new_offset
,
1951 .owner
= THIS_MODULE
,
1952 .load_super
= super_1_load
,
1953 .validate_super
= super_1_validate
,
1954 .sync_super
= super_1_sync
,
1955 .rdev_size_change
= super_1_rdev_size_change
,
1956 .allow_new_offset
= super_1_allow_new_offset
,
1960 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1962 if (mddev
->sync_super
) {
1963 mddev
->sync_super(mddev
, rdev
);
1967 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1969 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1972 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1974 struct md_rdev
*rdev
, *rdev2
;
1977 rdev_for_each_rcu(rdev
, mddev1
)
1978 rdev_for_each_rcu(rdev2
, mddev2
)
1979 if (rdev
->bdev
->bd_contains
==
1980 rdev2
->bdev
->bd_contains
) {
1988 static LIST_HEAD(pending_raid_disks
);
1991 * Try to register data integrity profile for an mddev
1993 * This is called when an array is started and after a disk has been kicked
1994 * from the array. It only succeeds if all working and active component devices
1995 * are integrity capable with matching profiles.
1997 int md_integrity_register(struct mddev
*mddev
)
1999 struct md_rdev
*rdev
, *reference
= NULL
;
2001 if (list_empty(&mddev
->disks
))
2002 return 0; /* nothing to do */
2003 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
2004 return 0; /* shouldn't register, or already is */
2005 rdev_for_each(rdev
, mddev
) {
2006 /* skip spares and non-functional disks */
2007 if (test_bit(Faulty
, &rdev
->flags
))
2009 if (rdev
->raid_disk
< 0)
2012 /* Use the first rdev as the reference */
2016 /* does this rdev's profile match the reference profile? */
2017 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
2018 rdev
->bdev
->bd_disk
) < 0)
2021 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2024 * All component devices are integrity capable and have matching
2025 * profiles, register the common profile for the md device.
2027 if (blk_integrity_register(mddev
->gendisk
,
2028 bdev_get_integrity(reference
->bdev
)) != 0) {
2029 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2033 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2034 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2035 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2041 EXPORT_SYMBOL(md_integrity_register
);
2043 /* Disable data integrity if non-capable/non-matching disk is being added */
2044 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2046 struct blk_integrity
*bi_rdev
;
2047 struct blk_integrity
*bi_mddev
;
2049 if (!mddev
->gendisk
)
2052 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2053 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2055 if (!bi_mddev
) /* nothing to do */
2057 if (rdev
->raid_disk
< 0) /* skip spares */
2059 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2060 rdev
->bdev
->bd_disk
) >= 0)
2062 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2063 blk_integrity_unregister(mddev
->gendisk
);
2065 EXPORT_SYMBOL(md_integrity_add_rdev
);
2067 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2069 char b
[BDEVNAME_SIZE
];
2079 /* prevent duplicates */
2080 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2083 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2084 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2085 rdev
->sectors
< mddev
->dev_sectors
)) {
2087 /* Cannot change size, so fail
2088 * If mddev->level <= 0, then we don't care
2089 * about aligning sizes (e.g. linear)
2091 if (mddev
->level
> 0)
2094 mddev
->dev_sectors
= rdev
->sectors
;
2097 /* Verify rdev->desc_nr is unique.
2098 * If it is -1, assign a free number, else
2099 * check number is not in use
2101 if (rdev
->desc_nr
< 0) {
2103 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2104 while (find_rdev_nr(mddev
, choice
))
2106 rdev
->desc_nr
= choice
;
2108 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2111 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2112 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2113 mdname(mddev
), mddev
->max_disks
);
2116 bdevname(rdev
->bdev
,b
);
2117 while ( (s
=strchr(b
, '/')) != NULL
)
2120 rdev
->mddev
= mddev
;
2121 printk(KERN_INFO
"md: bind<%s>\n", b
);
2123 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2126 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2127 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2128 /* failure here is OK */;
2129 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2131 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2132 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2134 /* May as well allow recovery to be retried once */
2135 mddev
->recovery_disabled
++;
2140 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2145 static void md_delayed_delete(struct work_struct
*ws
)
2147 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2148 kobject_del(&rdev
->kobj
);
2149 kobject_put(&rdev
->kobj
);
2152 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2154 char b
[BDEVNAME_SIZE
];
2159 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2160 list_del_rcu(&rdev
->same_set
);
2161 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2163 sysfs_remove_link(&rdev
->kobj
, "block");
2164 sysfs_put(rdev
->sysfs_state
);
2165 rdev
->sysfs_state
= NULL
;
2166 rdev
->badblocks
.count
= 0;
2167 /* We need to delay this, otherwise we can deadlock when
2168 * writing to 'remove' to "dev/state". We also need
2169 * to delay it due to rcu usage.
2172 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2173 kobject_get(&rdev
->kobj
);
2174 queue_work(md_misc_wq
, &rdev
->del_work
);
2178 * prevent the device from being mounted, repartitioned or
2179 * otherwise reused by a RAID array (or any other kernel
2180 * subsystem), by bd_claiming the device.
2182 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2185 struct block_device
*bdev
;
2186 char b
[BDEVNAME_SIZE
];
2188 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2189 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2191 printk(KERN_ERR
"md: could not open %s.\n",
2192 __bdevname(dev
, b
));
2193 return PTR_ERR(bdev
);
2199 static void unlock_rdev(struct md_rdev
*rdev
)
2201 struct block_device
*bdev
= rdev
->bdev
;
2205 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2208 void md_autodetect_dev(dev_t dev
);
2210 static void export_rdev(struct md_rdev
* rdev
)
2212 char b
[BDEVNAME_SIZE
];
2213 printk(KERN_INFO
"md: export_rdev(%s)\n",
2214 bdevname(rdev
->bdev
,b
));
2217 md_rdev_clear(rdev
);
2219 if (test_bit(AutoDetected
, &rdev
->flags
))
2220 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2223 kobject_put(&rdev
->kobj
);
2226 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2228 unbind_rdev_from_array(rdev
);
2232 static void export_array(struct mddev
*mddev
)
2234 struct md_rdev
*rdev
, *tmp
;
2236 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2241 kick_rdev_from_array(rdev
);
2243 if (!list_empty(&mddev
->disks
))
2245 mddev
->raid_disks
= 0;
2246 mddev
->major_version
= 0;
2249 static void print_desc(mdp_disk_t
*desc
)
2251 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2252 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2255 static void print_sb_90(mdp_super_t
*sb
)
2260 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2261 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2262 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2264 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2265 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2266 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2267 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2268 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2269 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2270 sb
->failed_disks
, sb
->spare_disks
,
2271 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2274 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2277 desc
= sb
->disks
+ i
;
2278 if (desc
->number
|| desc
->major
|| desc
->minor
||
2279 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2280 printk(" D %2d: ", i
);
2284 printk(KERN_INFO
"md: THIS: ");
2285 print_desc(&sb
->this_disk
);
2288 static void print_sb_1(struct mdp_superblock_1
*sb
)
2292 uuid
= sb
->set_uuid
;
2294 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2295 "md: Name: \"%s\" CT:%llu\n",
2296 le32_to_cpu(sb
->major_version
),
2297 le32_to_cpu(sb
->feature_map
),
2300 (unsigned long long)le64_to_cpu(sb
->ctime
)
2301 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2303 uuid
= sb
->device_uuid
;
2305 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2307 "md: Dev:%08x UUID: %pU\n"
2308 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2309 "md: (MaxDev:%u) \n",
2310 le32_to_cpu(sb
->level
),
2311 (unsigned long long)le64_to_cpu(sb
->size
),
2312 le32_to_cpu(sb
->raid_disks
),
2313 le32_to_cpu(sb
->layout
),
2314 le32_to_cpu(sb
->chunksize
),
2315 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2316 (unsigned long long)le64_to_cpu(sb
->data_size
),
2317 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2318 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2319 le32_to_cpu(sb
->dev_number
),
2322 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2323 (unsigned long long)le64_to_cpu(sb
->events
),
2324 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2325 le32_to_cpu(sb
->sb_csum
),
2326 le32_to_cpu(sb
->max_dev
)
2330 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2332 char b
[BDEVNAME_SIZE
];
2333 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2334 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2335 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2337 if (rdev
->sb_loaded
) {
2338 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2339 switch (major_version
) {
2341 print_sb_90(page_address(rdev
->sb_page
));
2344 print_sb_1(page_address(rdev
->sb_page
));
2348 printk(KERN_INFO
"md: no rdev superblock!\n");
2351 static void md_print_devices(void)
2353 struct list_head
*tmp
;
2354 struct md_rdev
*rdev
;
2355 struct mddev
*mddev
;
2356 char b
[BDEVNAME_SIZE
];
2359 printk("md: **********************************\n");
2360 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2361 printk("md: **********************************\n");
2362 for_each_mddev(mddev
, tmp
) {
2365 bitmap_print_sb(mddev
->bitmap
);
2367 printk("%s: ", mdname(mddev
));
2368 rdev_for_each(rdev
, mddev
)
2369 printk("<%s>", bdevname(rdev
->bdev
,b
));
2372 rdev_for_each(rdev
, mddev
)
2373 print_rdev(rdev
, mddev
->major_version
);
2375 printk("md: **********************************\n");
2380 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2382 /* Update each superblock (in-memory image), but
2383 * if we are allowed to, skip spares which already
2384 * have the right event counter, or have one earlier
2385 * (which would mean they aren't being marked as dirty
2386 * with the rest of the array)
2388 struct md_rdev
*rdev
;
2389 rdev_for_each(rdev
, mddev
) {
2390 if (rdev
->sb_events
== mddev
->events
||
2392 rdev
->raid_disk
< 0 &&
2393 rdev
->sb_events
+1 == mddev
->events
)) {
2394 /* Don't update this superblock */
2395 rdev
->sb_loaded
= 2;
2397 sync_super(mddev
, rdev
);
2398 rdev
->sb_loaded
= 1;
2403 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2405 struct md_rdev
*rdev
;
2408 int any_badblocks_changed
= 0;
2411 /* First make sure individual recovery_offsets are correct */
2412 rdev_for_each(rdev
, mddev
) {
2413 if (rdev
->raid_disk
>= 0 &&
2414 mddev
->delta_disks
>= 0 &&
2415 !test_bit(In_sync
, &rdev
->flags
) &&
2416 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2417 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2420 if (!mddev
->persistent
) {
2421 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2422 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2423 if (!mddev
->external
) {
2424 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2425 rdev_for_each(rdev
, mddev
) {
2426 if (rdev
->badblocks
.changed
) {
2427 rdev
->badblocks
.changed
= 0;
2428 md_ack_all_badblocks(&rdev
->badblocks
);
2429 md_error(mddev
, rdev
);
2431 clear_bit(Blocked
, &rdev
->flags
);
2432 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2433 wake_up(&rdev
->blocked_wait
);
2436 wake_up(&mddev
->sb_wait
);
2440 spin_lock_irq(&mddev
->write_lock
);
2442 mddev
->utime
= get_seconds();
2444 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2446 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2447 /* just a clean<-> dirty transition, possibly leave spares alone,
2448 * though if events isn't the right even/odd, we will have to do
2454 if (mddev
->degraded
)
2455 /* If the array is degraded, then skipping spares is both
2456 * dangerous and fairly pointless.
2457 * Dangerous because a device that was removed from the array
2458 * might have a event_count that still looks up-to-date,
2459 * so it can be re-added without a resync.
2460 * Pointless because if there are any spares to skip,
2461 * then a recovery will happen and soon that array won't
2462 * be degraded any more and the spare can go back to sleep then.
2466 sync_req
= mddev
->in_sync
;
2468 /* If this is just a dirty<->clean transition, and the array is clean
2469 * and 'events' is odd, we can roll back to the previous clean state */
2471 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2472 && mddev
->can_decrease_events
2473 && mddev
->events
!= 1) {
2475 mddev
->can_decrease_events
= 0;
2477 /* otherwise we have to go forward and ... */
2479 mddev
->can_decrease_events
= nospares
;
2482 if (!mddev
->events
) {
2484 * oops, this 64-bit counter should never wrap.
2485 * Either we are in around ~1 trillion A.C., assuming
2486 * 1 reboot per second, or we have a bug:
2492 rdev_for_each(rdev
, mddev
) {
2493 if (rdev
->badblocks
.changed
)
2494 any_badblocks_changed
++;
2495 if (test_bit(Faulty
, &rdev
->flags
))
2496 set_bit(FaultRecorded
, &rdev
->flags
);
2499 sync_sbs(mddev
, nospares
);
2500 spin_unlock_irq(&mddev
->write_lock
);
2502 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2503 mdname(mddev
), mddev
->in_sync
);
2505 bitmap_update_sb(mddev
->bitmap
);
2506 rdev_for_each(rdev
, mddev
) {
2507 char b
[BDEVNAME_SIZE
];
2509 if (rdev
->sb_loaded
!= 1)
2510 continue; /* no noise on spare devices */
2512 if (!test_bit(Faulty
, &rdev
->flags
) &&
2513 rdev
->saved_raid_disk
== -1) {
2514 md_super_write(mddev
,rdev
,
2515 rdev
->sb_start
, rdev
->sb_size
,
2517 pr_debug("md: (write) %s's sb offset: %llu\n",
2518 bdevname(rdev
->bdev
, b
),
2519 (unsigned long long)rdev
->sb_start
);
2520 rdev
->sb_events
= mddev
->events
;
2521 if (rdev
->badblocks
.size
) {
2522 md_super_write(mddev
, rdev
,
2523 rdev
->badblocks
.sector
,
2524 rdev
->badblocks
.size
<< 9,
2526 rdev
->badblocks
.size
= 0;
2529 } else if (test_bit(Faulty
, &rdev
->flags
))
2530 pr_debug("md: %s (skipping faulty)\n",
2531 bdevname(rdev
->bdev
, b
));
2533 pr_debug("(skipping incremental s/r ");
2535 if (mddev
->level
== LEVEL_MULTIPATH
)
2536 /* only need to write one superblock... */
2539 md_super_wait(mddev
);
2540 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2542 spin_lock_irq(&mddev
->write_lock
);
2543 if (mddev
->in_sync
!= sync_req
||
2544 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2545 /* have to write it out again */
2546 spin_unlock_irq(&mddev
->write_lock
);
2549 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2550 spin_unlock_irq(&mddev
->write_lock
);
2551 wake_up(&mddev
->sb_wait
);
2552 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2553 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2555 rdev_for_each(rdev
, mddev
) {
2556 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2557 clear_bit(Blocked
, &rdev
->flags
);
2559 if (any_badblocks_changed
)
2560 md_ack_all_badblocks(&rdev
->badblocks
);
2561 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2562 wake_up(&rdev
->blocked_wait
);
2566 /* words written to sysfs files may, or may not, be \n terminated.
2567 * We want to accept with case. For this we use cmd_match.
2569 static int cmd_match(const char *cmd
, const char *str
)
2571 /* See if cmd, written into a sysfs file, matches
2572 * str. They must either be the same, or cmd can
2573 * have a trailing newline
2575 while (*cmd
&& *str
&& *cmd
== *str
) {
2586 struct rdev_sysfs_entry
{
2587 struct attribute attr
;
2588 ssize_t (*show
)(struct md_rdev
*, char *);
2589 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2593 state_show(struct md_rdev
*rdev
, char *page
)
2598 if (test_bit(Faulty
, &rdev
->flags
) ||
2599 rdev
->badblocks
.unacked_exist
) {
2600 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2603 if (test_bit(In_sync
, &rdev
->flags
)) {
2604 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2607 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2608 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2611 if (test_bit(Blocked
, &rdev
->flags
) ||
2612 (rdev
->badblocks
.unacked_exist
2613 && !test_bit(Faulty
, &rdev
->flags
))) {
2614 len
+= sprintf(page
+len
, "%sblocked", sep
);
2617 if (!test_bit(Faulty
, &rdev
->flags
) &&
2618 !test_bit(In_sync
, &rdev
->flags
)) {
2619 len
+= sprintf(page
+len
, "%sspare", sep
);
2622 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2623 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2626 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2627 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2630 if (test_bit(Replacement
, &rdev
->flags
)) {
2631 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2635 return len
+sprintf(page
+len
, "\n");
2639 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2642 * faulty - simulates an error
2643 * remove - disconnects the device
2644 * writemostly - sets write_mostly
2645 * -writemostly - clears write_mostly
2646 * blocked - sets the Blocked flags
2647 * -blocked - clears the Blocked and possibly simulates an error
2648 * insync - sets Insync providing device isn't active
2649 * write_error - sets WriteErrorSeen
2650 * -write_error - clears WriteErrorSeen
2653 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2654 md_error(rdev
->mddev
, rdev
);
2655 if (test_bit(Faulty
, &rdev
->flags
))
2659 } else if (cmd_match(buf
, "remove")) {
2660 if (rdev
->raid_disk
>= 0)
2663 struct mddev
*mddev
= rdev
->mddev
;
2664 kick_rdev_from_array(rdev
);
2666 md_update_sb(mddev
, 1);
2667 md_new_event(mddev
);
2670 } else if (cmd_match(buf
, "writemostly")) {
2671 set_bit(WriteMostly
, &rdev
->flags
);
2673 } else if (cmd_match(buf
, "-writemostly")) {
2674 clear_bit(WriteMostly
, &rdev
->flags
);
2676 } else if (cmd_match(buf
, "blocked")) {
2677 set_bit(Blocked
, &rdev
->flags
);
2679 } else if (cmd_match(buf
, "-blocked")) {
2680 if (!test_bit(Faulty
, &rdev
->flags
) &&
2681 rdev
->badblocks
.unacked_exist
) {
2682 /* metadata handler doesn't understand badblocks,
2683 * so we need to fail the device
2685 md_error(rdev
->mddev
, rdev
);
2687 clear_bit(Blocked
, &rdev
->flags
);
2688 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2689 wake_up(&rdev
->blocked_wait
);
2690 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2691 md_wakeup_thread(rdev
->mddev
->thread
);
2694 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2695 set_bit(In_sync
, &rdev
->flags
);
2697 } else if (cmd_match(buf
, "write_error")) {
2698 set_bit(WriteErrorSeen
, &rdev
->flags
);
2700 } else if (cmd_match(buf
, "-write_error")) {
2701 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2703 } else if (cmd_match(buf
, "want_replacement")) {
2704 /* Any non-spare device that is not a replacement can
2705 * become want_replacement at any time, but we then need to
2706 * check if recovery is needed.
2708 if (rdev
->raid_disk
>= 0 &&
2709 !test_bit(Replacement
, &rdev
->flags
))
2710 set_bit(WantReplacement
, &rdev
->flags
);
2711 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2712 md_wakeup_thread(rdev
->mddev
->thread
);
2714 } else if (cmd_match(buf
, "-want_replacement")) {
2715 /* Clearing 'want_replacement' is always allowed.
2716 * Once replacements starts it is too late though.
2719 clear_bit(WantReplacement
, &rdev
->flags
);
2720 } else if (cmd_match(buf
, "replacement")) {
2721 /* Can only set a device as a replacement when array has not
2722 * yet been started. Once running, replacement is automatic
2723 * from spares, or by assigning 'slot'.
2725 if (rdev
->mddev
->pers
)
2728 set_bit(Replacement
, &rdev
->flags
);
2731 } else if (cmd_match(buf
, "-replacement")) {
2732 /* Similarly, can only clear Replacement before start */
2733 if (rdev
->mddev
->pers
)
2736 clear_bit(Replacement
, &rdev
->flags
);
2741 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2742 return err
? err
: len
;
2744 static struct rdev_sysfs_entry rdev_state
=
2745 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2748 errors_show(struct md_rdev
*rdev
, char *page
)
2750 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2754 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2757 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2758 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2759 atomic_set(&rdev
->corrected_errors
, n
);
2764 static struct rdev_sysfs_entry rdev_errors
=
2765 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2768 slot_show(struct md_rdev
*rdev
, char *page
)
2770 if (rdev
->raid_disk
< 0)
2771 return sprintf(page
, "none\n");
2773 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2777 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2781 int slot
= simple_strtoul(buf
, &e
, 10);
2782 if (strncmp(buf
, "none", 4)==0)
2784 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2786 if (rdev
->mddev
->pers
&& slot
== -1) {
2787 /* Setting 'slot' on an active array requires also
2788 * updating the 'rd%d' link, and communicating
2789 * with the personality with ->hot_*_disk.
2790 * For now we only support removing
2791 * failed/spare devices. This normally happens automatically,
2792 * but not when the metadata is externally managed.
2794 if (rdev
->raid_disk
== -1)
2796 /* personality does all needed checks */
2797 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2799 err
= rdev
->mddev
->pers
->
2800 hot_remove_disk(rdev
->mddev
, rdev
);
2803 sysfs_unlink_rdev(rdev
->mddev
, rdev
);
2804 rdev
->raid_disk
= -1;
2805 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2806 md_wakeup_thread(rdev
->mddev
->thread
);
2807 } else if (rdev
->mddev
->pers
) {
2808 /* Activating a spare .. or possibly reactivating
2809 * if we ever get bitmaps working here.
2812 if (rdev
->raid_disk
!= -1)
2815 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2818 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2821 if (slot
>= rdev
->mddev
->raid_disks
&&
2822 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2825 rdev
->raid_disk
= slot
;
2826 if (test_bit(In_sync
, &rdev
->flags
))
2827 rdev
->saved_raid_disk
= slot
;
2829 rdev
->saved_raid_disk
= -1;
2830 clear_bit(In_sync
, &rdev
->flags
);
2831 err
= rdev
->mddev
->pers
->
2832 hot_add_disk(rdev
->mddev
, rdev
);
2834 rdev
->raid_disk
= -1;
2837 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2838 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2839 /* failure here is OK */;
2840 /* don't wakeup anyone, leave that to userspace. */
2842 if (slot
>= rdev
->mddev
->raid_disks
&&
2843 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2845 rdev
->raid_disk
= slot
;
2846 /* assume it is working */
2847 clear_bit(Faulty
, &rdev
->flags
);
2848 clear_bit(WriteMostly
, &rdev
->flags
);
2849 set_bit(In_sync
, &rdev
->flags
);
2850 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2856 static struct rdev_sysfs_entry rdev_slot
=
2857 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2860 offset_show(struct md_rdev
*rdev
, char *page
)
2862 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2866 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2868 unsigned long long offset
;
2869 if (strict_strtoull(buf
, 10, &offset
) < 0)
2871 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2873 if (rdev
->sectors
&& rdev
->mddev
->external
)
2874 /* Must set offset before size, so overlap checks
2877 rdev
->data_offset
= offset
;
2878 rdev
->new_data_offset
= offset
;
2882 static struct rdev_sysfs_entry rdev_offset
=
2883 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2885 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2887 return sprintf(page
, "%llu\n",
2888 (unsigned long long)rdev
->new_data_offset
);
2891 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2892 const char *buf
, size_t len
)
2894 unsigned long long new_offset
;
2895 struct mddev
*mddev
= rdev
->mddev
;
2897 if (strict_strtoull(buf
, 10, &new_offset
) < 0)
2900 if (mddev
->sync_thread
)
2902 if (new_offset
== rdev
->data_offset
)
2903 /* reset is always permitted */
2905 else if (new_offset
> rdev
->data_offset
) {
2906 /* must not push array size beyond rdev_sectors */
2907 if (new_offset
- rdev
->data_offset
2908 + mddev
->dev_sectors
> rdev
->sectors
)
2911 /* Metadata worries about other space details. */
2913 /* decreasing the offset is inconsistent with a backwards
2916 if (new_offset
< rdev
->data_offset
&&
2917 mddev
->reshape_backwards
)
2919 /* Increasing offset is inconsistent with forwards
2920 * reshape. reshape_direction should be set to
2921 * 'backwards' first.
2923 if (new_offset
> rdev
->data_offset
&&
2924 !mddev
->reshape_backwards
)
2927 if (mddev
->pers
&& mddev
->persistent
&&
2928 !super_types
[mddev
->major_version
]
2929 .allow_new_offset(rdev
, new_offset
))
2931 rdev
->new_data_offset
= new_offset
;
2932 if (new_offset
> rdev
->data_offset
)
2933 mddev
->reshape_backwards
= 1;
2934 else if (new_offset
< rdev
->data_offset
)
2935 mddev
->reshape_backwards
= 0;
2939 static struct rdev_sysfs_entry rdev_new_offset
=
2940 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2943 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2945 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2948 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2950 /* check if two start/length pairs overlap */
2958 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2960 unsigned long long blocks
;
2963 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2966 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2967 return -EINVAL
; /* sector conversion overflow */
2970 if (new != blocks
* 2)
2971 return -EINVAL
; /* unsigned long long to sector_t overflow */
2978 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2980 struct mddev
*my_mddev
= rdev
->mddev
;
2981 sector_t oldsectors
= rdev
->sectors
;
2984 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2986 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2987 return -EINVAL
; /* too confusing */
2988 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2989 if (my_mddev
->persistent
) {
2990 sectors
= super_types
[my_mddev
->major_version
].
2991 rdev_size_change(rdev
, sectors
);
2994 } else if (!sectors
)
2995 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2998 if (sectors
< my_mddev
->dev_sectors
)
2999 return -EINVAL
; /* component must fit device */
3001 rdev
->sectors
= sectors
;
3002 if (sectors
> oldsectors
&& my_mddev
->external
) {
3003 /* need to check that all other rdevs with the same ->bdev
3004 * do not overlap. We need to unlock the mddev to avoid
3005 * a deadlock. We have already changed rdev->sectors, and if
3006 * we have to change it back, we will have the lock again.
3008 struct mddev
*mddev
;
3010 struct list_head
*tmp
;
3012 mddev_unlock(my_mddev
);
3013 for_each_mddev(mddev
, tmp
) {
3014 struct md_rdev
*rdev2
;
3017 rdev_for_each(rdev2
, mddev
)
3018 if (rdev
->bdev
== rdev2
->bdev
&&
3020 overlaps(rdev
->data_offset
, rdev
->sectors
,
3026 mddev_unlock(mddev
);
3032 mddev_lock(my_mddev
);
3034 /* Someone else could have slipped in a size
3035 * change here, but doing so is just silly.
3036 * We put oldsectors back because we *know* it is
3037 * safe, and trust userspace not to race with
3040 rdev
->sectors
= oldsectors
;
3047 static struct rdev_sysfs_entry rdev_size
=
3048 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3051 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3053 unsigned long long recovery_start
= rdev
->recovery_offset
;
3055 if (test_bit(In_sync
, &rdev
->flags
) ||
3056 recovery_start
== MaxSector
)
3057 return sprintf(page
, "none\n");
3059 return sprintf(page
, "%llu\n", recovery_start
);
3062 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3064 unsigned long long recovery_start
;
3066 if (cmd_match(buf
, "none"))
3067 recovery_start
= MaxSector
;
3068 else if (strict_strtoull(buf
, 10, &recovery_start
))
3071 if (rdev
->mddev
->pers
&&
3072 rdev
->raid_disk
>= 0)
3075 rdev
->recovery_offset
= recovery_start
;
3076 if (recovery_start
== MaxSector
)
3077 set_bit(In_sync
, &rdev
->flags
);
3079 clear_bit(In_sync
, &rdev
->flags
);
3083 static struct rdev_sysfs_entry rdev_recovery_start
=
3084 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3088 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3090 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3092 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3094 return badblocks_show(&rdev
->badblocks
, page
, 0);
3096 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3098 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3099 /* Maybe that ack was all we needed */
3100 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3101 wake_up(&rdev
->blocked_wait
);
3104 static struct rdev_sysfs_entry rdev_bad_blocks
=
3105 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3108 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3110 return badblocks_show(&rdev
->badblocks
, page
, 1);
3112 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3114 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3116 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3117 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3119 static struct attribute
*rdev_default_attrs
[] = {
3124 &rdev_new_offset
.attr
,
3126 &rdev_recovery_start
.attr
,
3127 &rdev_bad_blocks
.attr
,
3128 &rdev_unack_bad_blocks
.attr
,
3132 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3134 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3135 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3136 struct mddev
*mddev
= rdev
->mddev
;
3142 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3144 if (rdev
->mddev
== NULL
)
3147 rv
= entry
->show(rdev
, page
);
3148 mddev_unlock(mddev
);
3154 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3155 const char *page
, size_t length
)
3157 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3158 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3160 struct mddev
*mddev
= rdev
->mddev
;
3164 if (!capable(CAP_SYS_ADMIN
))
3166 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3168 if (rdev
->mddev
== NULL
)
3171 rv
= entry
->store(rdev
, page
, length
);
3172 mddev_unlock(mddev
);
3177 static void rdev_free(struct kobject
*ko
)
3179 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3182 static const struct sysfs_ops rdev_sysfs_ops
= {
3183 .show
= rdev_attr_show
,
3184 .store
= rdev_attr_store
,
3186 static struct kobj_type rdev_ktype
= {
3187 .release
= rdev_free
,
3188 .sysfs_ops
= &rdev_sysfs_ops
,
3189 .default_attrs
= rdev_default_attrs
,
3192 int md_rdev_init(struct md_rdev
*rdev
)
3195 rdev
->saved_raid_disk
= -1;
3196 rdev
->raid_disk
= -1;
3198 rdev
->data_offset
= 0;
3199 rdev
->new_data_offset
= 0;
3200 rdev
->sb_events
= 0;
3201 rdev
->last_read_error
.tv_sec
= 0;
3202 rdev
->last_read_error
.tv_nsec
= 0;
3203 rdev
->sb_loaded
= 0;
3204 rdev
->bb_page
= NULL
;
3205 atomic_set(&rdev
->nr_pending
, 0);
3206 atomic_set(&rdev
->read_errors
, 0);
3207 atomic_set(&rdev
->corrected_errors
, 0);
3209 INIT_LIST_HEAD(&rdev
->same_set
);
3210 init_waitqueue_head(&rdev
->blocked_wait
);
3212 /* Add space to store bad block list.
3213 * This reserves the space even on arrays where it cannot
3214 * be used - I wonder if that matters
3216 rdev
->badblocks
.count
= 0;
3217 rdev
->badblocks
.shift
= 0;
3218 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3219 seqlock_init(&rdev
->badblocks
.lock
);
3220 if (rdev
->badblocks
.page
== NULL
)
3225 EXPORT_SYMBOL_GPL(md_rdev_init
);
3227 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3229 * mark the device faulty if:
3231 * - the device is nonexistent (zero size)
3232 * - the device has no valid superblock
3234 * a faulty rdev _never_ has rdev->sb set.
3236 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3238 char b
[BDEVNAME_SIZE
];
3240 struct md_rdev
*rdev
;
3243 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3245 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3246 return ERR_PTR(-ENOMEM
);
3249 err
= md_rdev_init(rdev
);
3252 err
= alloc_disk_sb(rdev
);
3256 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3260 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3262 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3265 "md: %s has zero or unknown size, marking faulty!\n",
3266 bdevname(rdev
->bdev
,b
));
3271 if (super_format
>= 0) {
3272 err
= super_types
[super_format
].
3273 load_super(rdev
, NULL
, super_minor
);
3274 if (err
== -EINVAL
) {
3276 "md: %s does not have a valid v%d.%d "
3277 "superblock, not importing!\n",
3278 bdevname(rdev
->bdev
,b
),
3279 super_format
, super_minor
);
3284 "md: could not read %s's sb, not importing!\n",
3285 bdevname(rdev
->bdev
,b
));
3289 if (super_format
== -1)
3290 /* hot-add for 0.90, or non-persistent: so no badblocks */
3291 rdev
->badblocks
.shift
= -1;
3298 md_rdev_clear(rdev
);
3300 return ERR_PTR(err
);
3304 * Check a full RAID array for plausibility
3308 static void analyze_sbs(struct mddev
* mddev
)
3311 struct md_rdev
*rdev
, *freshest
, *tmp
;
3312 char b
[BDEVNAME_SIZE
];
3315 rdev_for_each_safe(rdev
, tmp
, mddev
)
3316 switch (super_types
[mddev
->major_version
].
3317 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3325 "md: fatal superblock inconsistency in %s"
3326 " -- removing from array\n",
3327 bdevname(rdev
->bdev
,b
));
3328 kick_rdev_from_array(rdev
);
3332 super_types
[mddev
->major_version
].
3333 validate_super(mddev
, freshest
);
3336 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3337 if (mddev
->max_disks
&&
3338 (rdev
->desc_nr
>= mddev
->max_disks
||
3339 i
> mddev
->max_disks
)) {
3341 "md: %s: %s: only %d devices permitted\n",
3342 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3344 kick_rdev_from_array(rdev
);
3347 if (rdev
!= freshest
)
3348 if (super_types
[mddev
->major_version
].
3349 validate_super(mddev
, rdev
)) {
3350 printk(KERN_WARNING
"md: kicking non-fresh %s"
3352 bdevname(rdev
->bdev
,b
));
3353 kick_rdev_from_array(rdev
);
3356 if (mddev
->level
== LEVEL_MULTIPATH
) {
3357 rdev
->desc_nr
= i
++;
3358 rdev
->raid_disk
= rdev
->desc_nr
;
3359 set_bit(In_sync
, &rdev
->flags
);
3360 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3361 rdev
->raid_disk
= -1;
3362 clear_bit(In_sync
, &rdev
->flags
);
3367 /* Read a fixed-point number.
3368 * Numbers in sysfs attributes should be in "standard" units where
3369 * possible, so time should be in seconds.
3370 * However we internally use a a much smaller unit such as
3371 * milliseconds or jiffies.
3372 * This function takes a decimal number with a possible fractional
3373 * component, and produces an integer which is the result of
3374 * multiplying that number by 10^'scale'.
3375 * all without any floating-point arithmetic.
3377 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3379 unsigned long result
= 0;
3381 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3384 else if (decimals
< scale
) {
3387 result
= result
* 10 + value
;
3399 while (decimals
< scale
) {
3408 static void md_safemode_timeout(unsigned long data
);
3411 safe_delay_show(struct mddev
*mddev
, char *page
)
3413 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3414 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3417 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3421 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3424 mddev
->safemode_delay
= 0;
3426 unsigned long old_delay
= mddev
->safemode_delay
;
3427 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3428 if (mddev
->safemode_delay
== 0)
3429 mddev
->safemode_delay
= 1;
3430 if (mddev
->safemode_delay
< old_delay
)
3431 md_safemode_timeout((unsigned long)mddev
);
3435 static struct md_sysfs_entry md_safe_delay
=
3436 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3439 level_show(struct mddev
*mddev
, char *page
)
3441 struct md_personality
*p
= mddev
->pers
;
3443 return sprintf(page
, "%s\n", p
->name
);
3444 else if (mddev
->clevel
[0])
3445 return sprintf(page
, "%s\n", mddev
->clevel
);
3446 else if (mddev
->level
!= LEVEL_NONE
)
3447 return sprintf(page
, "%d\n", mddev
->level
);
3453 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3457 struct md_personality
*pers
;
3460 struct md_rdev
*rdev
;
3462 if (mddev
->pers
== NULL
) {
3465 if (len
>= sizeof(mddev
->clevel
))
3467 strncpy(mddev
->clevel
, buf
, len
);
3468 if (mddev
->clevel
[len
-1] == '\n')
3470 mddev
->clevel
[len
] = 0;
3471 mddev
->level
= LEVEL_NONE
;
3475 /* request to change the personality. Need to ensure:
3476 * - array is not engaged in resync/recovery/reshape
3477 * - old personality can be suspended
3478 * - new personality will access other array.
3481 if (mddev
->sync_thread
||
3482 mddev
->reshape_position
!= MaxSector
||
3483 mddev
->sysfs_active
)
3486 if (!mddev
->pers
->quiesce
) {
3487 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3488 mdname(mddev
), mddev
->pers
->name
);
3492 /* Now find the new personality */
3493 if (len
== 0 || len
>= sizeof(clevel
))
3495 strncpy(clevel
, buf
, len
);
3496 if (clevel
[len
-1] == '\n')
3499 if (strict_strtol(clevel
, 10, &level
))
3502 if (request_module("md-%s", clevel
) != 0)
3503 request_module("md-level-%s", clevel
);
3504 spin_lock(&pers_lock
);
3505 pers
= find_pers(level
, clevel
);
3506 if (!pers
|| !try_module_get(pers
->owner
)) {
3507 spin_unlock(&pers_lock
);
3508 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3511 spin_unlock(&pers_lock
);
3513 if (pers
== mddev
->pers
) {
3514 /* Nothing to do! */
3515 module_put(pers
->owner
);
3518 if (!pers
->takeover
) {
3519 module_put(pers
->owner
);
3520 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3521 mdname(mddev
), clevel
);
3525 rdev_for_each(rdev
, mddev
)
3526 rdev
->new_raid_disk
= rdev
->raid_disk
;
3528 /* ->takeover must set new_* and/or delta_disks
3529 * if it succeeds, and may set them when it fails.
3531 priv
= pers
->takeover(mddev
);
3533 mddev
->new_level
= mddev
->level
;
3534 mddev
->new_layout
= mddev
->layout
;
3535 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3536 mddev
->raid_disks
-= mddev
->delta_disks
;
3537 mddev
->delta_disks
= 0;
3538 mddev
->reshape_backwards
= 0;
3539 module_put(pers
->owner
);
3540 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3541 mdname(mddev
), clevel
);
3542 return PTR_ERR(priv
);
3545 /* Looks like we have a winner */
3546 mddev_suspend(mddev
);
3547 mddev
->pers
->stop(mddev
);
3549 if (mddev
->pers
->sync_request
== NULL
&&
3550 pers
->sync_request
!= NULL
) {
3551 /* need to add the md_redundancy_group */
3552 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3554 "md: cannot register extra attributes for %s\n",
3556 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3558 if (mddev
->pers
->sync_request
!= NULL
&&
3559 pers
->sync_request
== NULL
) {
3560 /* need to remove the md_redundancy_group */
3561 if (mddev
->to_remove
== NULL
)
3562 mddev
->to_remove
= &md_redundancy_group
;
3565 if (mddev
->pers
->sync_request
== NULL
&&
3567 /* We are converting from a no-redundancy array
3568 * to a redundancy array and metadata is managed
3569 * externally so we need to be sure that writes
3570 * won't block due to a need to transition
3572 * until external management is started.
3575 mddev
->safemode_delay
= 0;
3576 mddev
->safemode
= 0;
3579 rdev_for_each(rdev
, mddev
) {
3580 if (rdev
->raid_disk
< 0)
3582 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3583 rdev
->new_raid_disk
= -1;
3584 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3586 sysfs_unlink_rdev(mddev
, rdev
);
3588 rdev_for_each(rdev
, mddev
) {
3589 if (rdev
->raid_disk
< 0)
3591 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3593 rdev
->raid_disk
= rdev
->new_raid_disk
;
3594 if (rdev
->raid_disk
< 0)
3595 clear_bit(In_sync
, &rdev
->flags
);
3597 if (sysfs_link_rdev(mddev
, rdev
))
3598 printk(KERN_WARNING
"md: cannot register rd%d"
3599 " for %s after level change\n",
3600 rdev
->raid_disk
, mdname(mddev
));
3604 module_put(mddev
->pers
->owner
);
3606 mddev
->private = priv
;
3607 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3608 mddev
->level
= mddev
->new_level
;
3609 mddev
->layout
= mddev
->new_layout
;
3610 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3611 mddev
->delta_disks
= 0;
3612 mddev
->reshape_backwards
= 0;
3613 mddev
->degraded
= 0;
3614 if (mddev
->pers
->sync_request
== NULL
) {
3615 /* this is now an array without redundancy, so
3616 * it must always be in_sync
3619 del_timer_sync(&mddev
->safemode_timer
);
3622 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3623 mddev_resume(mddev
);
3624 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3625 md_new_event(mddev
);
3629 static struct md_sysfs_entry md_level
=
3630 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3634 layout_show(struct mddev
*mddev
, char *page
)
3636 /* just a number, not meaningful for all levels */
3637 if (mddev
->reshape_position
!= MaxSector
&&
3638 mddev
->layout
!= mddev
->new_layout
)
3639 return sprintf(page
, "%d (%d)\n",
3640 mddev
->new_layout
, mddev
->layout
);
3641 return sprintf(page
, "%d\n", mddev
->layout
);
3645 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3648 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3650 if (!*buf
|| (*e
&& *e
!= '\n'))
3655 if (mddev
->pers
->check_reshape
== NULL
)
3657 mddev
->new_layout
= n
;
3658 err
= mddev
->pers
->check_reshape(mddev
);
3660 mddev
->new_layout
= mddev
->layout
;
3664 mddev
->new_layout
= n
;
3665 if (mddev
->reshape_position
== MaxSector
)
3670 static struct md_sysfs_entry md_layout
=
3671 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3675 raid_disks_show(struct mddev
*mddev
, char *page
)
3677 if (mddev
->raid_disks
== 0)
3679 if (mddev
->reshape_position
!= MaxSector
&&
3680 mddev
->delta_disks
!= 0)
3681 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3682 mddev
->raid_disks
- mddev
->delta_disks
);
3683 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3686 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3689 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3693 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3695 if (!*buf
|| (*e
&& *e
!= '\n'))
3699 rv
= update_raid_disks(mddev
, n
);
3700 else if (mddev
->reshape_position
!= MaxSector
) {
3701 struct md_rdev
*rdev
;
3702 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3704 rdev_for_each(rdev
, mddev
) {
3706 rdev
->data_offset
< rdev
->new_data_offset
)
3709 rdev
->data_offset
> rdev
->new_data_offset
)
3712 mddev
->delta_disks
= n
- olddisks
;
3713 mddev
->raid_disks
= n
;
3714 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3716 mddev
->raid_disks
= n
;
3717 return rv
? rv
: len
;
3719 static struct md_sysfs_entry md_raid_disks
=
3720 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3723 chunk_size_show(struct mddev
*mddev
, char *page
)
3725 if (mddev
->reshape_position
!= MaxSector
&&
3726 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3727 return sprintf(page
, "%d (%d)\n",
3728 mddev
->new_chunk_sectors
<< 9,
3729 mddev
->chunk_sectors
<< 9);
3730 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3734 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3737 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3739 if (!*buf
|| (*e
&& *e
!= '\n'))
3744 if (mddev
->pers
->check_reshape
== NULL
)
3746 mddev
->new_chunk_sectors
= n
>> 9;
3747 err
= mddev
->pers
->check_reshape(mddev
);
3749 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3753 mddev
->new_chunk_sectors
= n
>> 9;
3754 if (mddev
->reshape_position
== MaxSector
)
3755 mddev
->chunk_sectors
= n
>> 9;
3759 static struct md_sysfs_entry md_chunk_size
=
3760 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3763 resync_start_show(struct mddev
*mddev
, char *page
)
3765 if (mddev
->recovery_cp
== MaxSector
)
3766 return sprintf(page
, "none\n");
3767 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3771 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3774 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3776 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3778 if (cmd_match(buf
, "none"))
3780 else if (!*buf
|| (*e
&& *e
!= '\n'))
3783 mddev
->recovery_cp
= n
;
3785 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3788 static struct md_sysfs_entry md_resync_start
=
3789 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3792 * The array state can be:
3795 * No devices, no size, no level
3796 * Equivalent to STOP_ARRAY ioctl
3798 * May have some settings, but array is not active
3799 * all IO results in error
3800 * When written, doesn't tear down array, but just stops it
3801 * suspended (not supported yet)
3802 * All IO requests will block. The array can be reconfigured.
3803 * Writing this, if accepted, will block until array is quiescent
3805 * no resync can happen. no superblocks get written.
3806 * write requests fail
3808 * like readonly, but behaves like 'clean' on a write request.
3810 * clean - no pending writes, but otherwise active.
3811 * When written to inactive array, starts without resync
3812 * If a write request arrives then
3813 * if metadata is known, mark 'dirty' and switch to 'active'.
3814 * if not known, block and switch to write-pending
3815 * If written to an active array that has pending writes, then fails.
3817 * fully active: IO and resync can be happening.
3818 * When written to inactive array, starts with resync
3821 * clean, but writes are blocked waiting for 'active' to be written.
3824 * like active, but no writes have been seen for a while (100msec).
3827 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3828 write_pending
, active_idle
, bad_word
};
3829 static char *array_states
[] = {
3830 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3831 "write-pending", "active-idle", NULL
};
3833 static int match_word(const char *word
, char **list
)
3836 for (n
=0; list
[n
]; n
++)
3837 if (cmd_match(word
, list
[n
]))
3843 array_state_show(struct mddev
*mddev
, char *page
)
3845 enum array_state st
= inactive
;
3858 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3860 else if (mddev
->safemode
)
3866 if (list_empty(&mddev
->disks
) &&
3867 mddev
->raid_disks
== 0 &&
3868 mddev
->dev_sectors
== 0)
3873 return sprintf(page
, "%s\n", array_states
[st
]);
3876 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3877 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3878 static int do_md_run(struct mddev
* mddev
);
3879 static int restart_array(struct mddev
*mddev
);
3882 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3885 enum array_state st
= match_word(buf
, array_states
);
3890 /* stopping an active array */
3891 err
= do_md_stop(mddev
, 0, NULL
);
3894 /* stopping an active array */
3896 err
= do_md_stop(mddev
, 2, NULL
);
3898 err
= 0; /* already inactive */
3901 break; /* not supported yet */
3904 err
= md_set_readonly(mddev
, NULL
);
3907 set_disk_ro(mddev
->gendisk
, 1);
3908 err
= do_md_run(mddev
);
3914 err
= md_set_readonly(mddev
, NULL
);
3915 else if (mddev
->ro
== 1)
3916 err
= restart_array(mddev
);
3919 set_disk_ro(mddev
->gendisk
, 0);
3923 err
= do_md_run(mddev
);
3928 restart_array(mddev
);
3929 spin_lock_irq(&mddev
->write_lock
);
3930 if (atomic_read(&mddev
->writes_pending
) == 0) {
3931 if (mddev
->in_sync
== 0) {
3933 if (mddev
->safemode
== 1)
3934 mddev
->safemode
= 0;
3935 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3940 spin_unlock_irq(&mddev
->write_lock
);
3946 restart_array(mddev
);
3947 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3948 wake_up(&mddev
->sb_wait
);
3952 set_disk_ro(mddev
->gendisk
, 0);
3953 err
= do_md_run(mddev
);
3958 /* these cannot be set */
3964 if (mddev
->hold_active
== UNTIL_IOCTL
)
3965 mddev
->hold_active
= 0;
3966 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3970 static struct md_sysfs_entry md_array_state
=
3971 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3974 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3975 return sprintf(page
, "%d\n",
3976 atomic_read(&mddev
->max_corr_read_errors
));
3980 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3983 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3985 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3986 atomic_set(&mddev
->max_corr_read_errors
, n
);
3992 static struct md_sysfs_entry max_corr_read_errors
=
3993 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3994 max_corrected_read_errors_store
);
3997 null_show(struct mddev
*mddev
, char *page
)
4003 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4005 /* buf must be %d:%d\n? giving major and minor numbers */
4006 /* The new device is added to the array.
4007 * If the array has a persistent superblock, we read the
4008 * superblock to initialise info and check validity.
4009 * Otherwise, only checking done is that in bind_rdev_to_array,
4010 * which mainly checks size.
4013 int major
= simple_strtoul(buf
, &e
, 10);
4016 struct md_rdev
*rdev
;
4019 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4021 minor
= simple_strtoul(e
+1, &e
, 10);
4022 if (*e
&& *e
!= '\n')
4024 dev
= MKDEV(major
, minor
);
4025 if (major
!= MAJOR(dev
) ||
4026 minor
!= MINOR(dev
))
4030 if (mddev
->persistent
) {
4031 rdev
= md_import_device(dev
, mddev
->major_version
,
4032 mddev
->minor_version
);
4033 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4034 struct md_rdev
*rdev0
4035 = list_entry(mddev
->disks
.next
,
4036 struct md_rdev
, same_set
);
4037 err
= super_types
[mddev
->major_version
]
4038 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4042 } else if (mddev
->external
)
4043 rdev
= md_import_device(dev
, -2, -1);
4045 rdev
= md_import_device(dev
, -1, -1);
4048 return PTR_ERR(rdev
);
4049 err
= bind_rdev_to_array(rdev
, mddev
);
4053 return err
? err
: len
;
4056 static struct md_sysfs_entry md_new_device
=
4057 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4060 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4063 unsigned long chunk
, end_chunk
;
4067 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4069 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4070 if (buf
== end
) break;
4071 if (*end
== '-') { /* range */
4073 end_chunk
= simple_strtoul(buf
, &end
, 0);
4074 if (buf
== end
) break;
4076 if (*end
&& !isspace(*end
)) break;
4077 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4078 buf
= skip_spaces(end
);
4080 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4085 static struct md_sysfs_entry md_bitmap
=
4086 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4089 size_show(struct mddev
*mddev
, char *page
)
4091 return sprintf(page
, "%llu\n",
4092 (unsigned long long)mddev
->dev_sectors
/ 2);
4095 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4098 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4100 /* If array is inactive, we can reduce the component size, but
4101 * not increase it (except from 0).
4102 * If array is active, we can try an on-line resize
4105 int err
= strict_blocks_to_sectors(buf
, §ors
);
4110 err
= update_size(mddev
, sectors
);
4111 md_update_sb(mddev
, 1);
4113 if (mddev
->dev_sectors
== 0 ||
4114 mddev
->dev_sectors
> sectors
)
4115 mddev
->dev_sectors
= sectors
;
4119 return err
? err
: len
;
4122 static struct md_sysfs_entry md_size
=
4123 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4126 /* Metadata version.
4128 * 'none' for arrays with no metadata (good luck...)
4129 * 'external' for arrays with externally managed metadata,
4130 * or N.M for internally known formats
4133 metadata_show(struct mddev
*mddev
, char *page
)
4135 if (mddev
->persistent
)
4136 return sprintf(page
, "%d.%d\n",
4137 mddev
->major_version
, mddev
->minor_version
);
4138 else if (mddev
->external
)
4139 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4141 return sprintf(page
, "none\n");
4145 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4149 /* Changing the details of 'external' metadata is
4150 * always permitted. Otherwise there must be
4151 * no devices attached to the array.
4153 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4155 else if (!list_empty(&mddev
->disks
))
4158 if (cmd_match(buf
, "none")) {
4159 mddev
->persistent
= 0;
4160 mddev
->external
= 0;
4161 mddev
->major_version
= 0;
4162 mddev
->minor_version
= 90;
4165 if (strncmp(buf
, "external:", 9) == 0) {
4166 size_t namelen
= len
-9;
4167 if (namelen
>= sizeof(mddev
->metadata_type
))
4168 namelen
= sizeof(mddev
->metadata_type
)-1;
4169 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4170 mddev
->metadata_type
[namelen
] = 0;
4171 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4172 mddev
->metadata_type
[--namelen
] = 0;
4173 mddev
->persistent
= 0;
4174 mddev
->external
= 1;
4175 mddev
->major_version
= 0;
4176 mddev
->minor_version
= 90;
4179 major
= simple_strtoul(buf
, &e
, 10);
4180 if (e
==buf
|| *e
!= '.')
4183 minor
= simple_strtoul(buf
, &e
, 10);
4184 if (e
==buf
|| (*e
&& *e
!= '\n') )
4186 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4188 mddev
->major_version
= major
;
4189 mddev
->minor_version
= minor
;
4190 mddev
->persistent
= 1;
4191 mddev
->external
= 0;
4195 static struct md_sysfs_entry md_metadata
=
4196 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4199 action_show(struct mddev
*mddev
, char *page
)
4201 char *type
= "idle";
4202 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4204 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4205 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4206 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4208 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4209 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4211 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4215 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4218 return sprintf(page
, "%s\n", type
);
4221 static void reap_sync_thread(struct mddev
*mddev
);
4224 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4226 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4229 if (cmd_match(page
, "frozen"))
4230 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4232 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4234 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4235 if (mddev
->sync_thread
) {
4236 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4237 reap_sync_thread(mddev
);
4239 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4240 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4242 else if (cmd_match(page
, "resync"))
4243 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4244 else if (cmd_match(page
, "recover")) {
4245 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4246 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4247 } else if (cmd_match(page
, "reshape")) {
4249 if (mddev
->pers
->start_reshape
== NULL
)
4251 err
= mddev
->pers
->start_reshape(mddev
);
4254 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4256 if (cmd_match(page
, "check"))
4257 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4258 else if (!cmd_match(page
, "repair"))
4260 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4261 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4263 if (mddev
->ro
== 2) {
4264 /* A write to sync_action is enough to justify
4265 * canceling read-auto mode
4268 md_wakeup_thread(mddev
->sync_thread
);
4270 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4271 md_wakeup_thread(mddev
->thread
);
4272 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4277 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4279 return sprintf(page
, "%llu\n",
4280 (unsigned long long)
4281 atomic64_read(&mddev
->resync_mismatches
));
4284 static struct md_sysfs_entry md_scan_mode
=
4285 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4288 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4291 sync_min_show(struct mddev
*mddev
, char *page
)
4293 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4294 mddev
->sync_speed_min
? "local": "system");
4298 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4302 if (strncmp(buf
, "system", 6)==0) {
4303 mddev
->sync_speed_min
= 0;
4306 min
= simple_strtoul(buf
, &e
, 10);
4307 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4309 mddev
->sync_speed_min
= min
;
4313 static struct md_sysfs_entry md_sync_min
=
4314 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4317 sync_max_show(struct mddev
*mddev
, char *page
)
4319 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4320 mddev
->sync_speed_max
? "local": "system");
4324 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4328 if (strncmp(buf
, "system", 6)==0) {
4329 mddev
->sync_speed_max
= 0;
4332 max
= simple_strtoul(buf
, &e
, 10);
4333 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4335 mddev
->sync_speed_max
= max
;
4339 static struct md_sysfs_entry md_sync_max
=
4340 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4343 degraded_show(struct mddev
*mddev
, char *page
)
4345 return sprintf(page
, "%d\n", mddev
->degraded
);
4347 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4350 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4352 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4356 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4360 if (strict_strtol(buf
, 10, &n
))
4363 if (n
!= 0 && n
!= 1)
4366 mddev
->parallel_resync
= n
;
4368 if (mddev
->sync_thread
)
4369 wake_up(&resync_wait
);
4374 /* force parallel resync, even with shared block devices */
4375 static struct md_sysfs_entry md_sync_force_parallel
=
4376 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4377 sync_force_parallel_show
, sync_force_parallel_store
);
4380 sync_speed_show(struct mddev
*mddev
, char *page
)
4382 unsigned long resync
, dt
, db
;
4383 if (mddev
->curr_resync
== 0)
4384 return sprintf(page
, "none\n");
4385 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4386 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4388 db
= resync
- mddev
->resync_mark_cnt
;
4389 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4392 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4395 sync_completed_show(struct mddev
*mddev
, char *page
)
4397 unsigned long long max_sectors
, resync
;
4399 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4400 return sprintf(page
, "none\n");
4402 if (mddev
->curr_resync
== 1 ||
4403 mddev
->curr_resync
== 2)
4404 return sprintf(page
, "delayed\n");
4406 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4407 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4408 max_sectors
= mddev
->resync_max_sectors
;
4410 max_sectors
= mddev
->dev_sectors
;
4412 resync
= mddev
->curr_resync_completed
;
4413 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4416 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4419 min_sync_show(struct mddev
*mddev
, char *page
)
4421 return sprintf(page
, "%llu\n",
4422 (unsigned long long)mddev
->resync_min
);
4425 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4427 unsigned long long min
;
4428 if (strict_strtoull(buf
, 10, &min
))
4430 if (min
> mddev
->resync_max
)
4432 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4435 /* Must be a multiple of chunk_size */
4436 if (mddev
->chunk_sectors
) {
4437 sector_t temp
= min
;
4438 if (sector_div(temp
, mddev
->chunk_sectors
))
4441 mddev
->resync_min
= min
;
4446 static struct md_sysfs_entry md_min_sync
=
4447 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4450 max_sync_show(struct mddev
*mddev
, char *page
)
4452 if (mddev
->resync_max
== MaxSector
)
4453 return sprintf(page
, "max\n");
4455 return sprintf(page
, "%llu\n",
4456 (unsigned long long)mddev
->resync_max
);
4459 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4461 if (strncmp(buf
, "max", 3) == 0)
4462 mddev
->resync_max
= MaxSector
;
4464 unsigned long long max
;
4465 if (strict_strtoull(buf
, 10, &max
))
4467 if (max
< mddev
->resync_min
)
4469 if (max
< mddev
->resync_max
&&
4471 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4474 /* Must be a multiple of chunk_size */
4475 if (mddev
->chunk_sectors
) {
4476 sector_t temp
= max
;
4477 if (sector_div(temp
, mddev
->chunk_sectors
))
4480 mddev
->resync_max
= max
;
4482 wake_up(&mddev
->recovery_wait
);
4486 static struct md_sysfs_entry md_max_sync
=
4487 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4490 suspend_lo_show(struct mddev
*mddev
, char *page
)
4492 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4496 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4499 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4500 unsigned long long old
= mddev
->suspend_lo
;
4502 if (mddev
->pers
== NULL
||
4503 mddev
->pers
->quiesce
== NULL
)
4505 if (buf
== e
|| (*e
&& *e
!= '\n'))
4508 mddev
->suspend_lo
= new;
4510 /* Shrinking suspended region */
4511 mddev
->pers
->quiesce(mddev
, 2);
4513 /* Expanding suspended region - need to wait */
4514 mddev
->pers
->quiesce(mddev
, 1);
4515 mddev
->pers
->quiesce(mddev
, 0);
4519 static struct md_sysfs_entry md_suspend_lo
=
4520 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4524 suspend_hi_show(struct mddev
*mddev
, char *page
)
4526 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4530 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4533 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4534 unsigned long long old
= mddev
->suspend_hi
;
4536 if (mddev
->pers
== NULL
||
4537 mddev
->pers
->quiesce
== NULL
)
4539 if (buf
== e
|| (*e
&& *e
!= '\n'))
4542 mddev
->suspend_hi
= new;
4544 /* Shrinking suspended region */
4545 mddev
->pers
->quiesce(mddev
, 2);
4547 /* Expanding suspended region - need to wait */
4548 mddev
->pers
->quiesce(mddev
, 1);
4549 mddev
->pers
->quiesce(mddev
, 0);
4553 static struct md_sysfs_entry md_suspend_hi
=
4554 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4557 reshape_position_show(struct mddev
*mddev
, char *page
)
4559 if (mddev
->reshape_position
!= MaxSector
)
4560 return sprintf(page
, "%llu\n",
4561 (unsigned long long)mddev
->reshape_position
);
4562 strcpy(page
, "none\n");
4567 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4569 struct md_rdev
*rdev
;
4571 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4574 if (buf
== e
|| (*e
&& *e
!= '\n'))
4576 mddev
->reshape_position
= new;
4577 mddev
->delta_disks
= 0;
4578 mddev
->reshape_backwards
= 0;
4579 mddev
->new_level
= mddev
->level
;
4580 mddev
->new_layout
= mddev
->layout
;
4581 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4582 rdev_for_each(rdev
, mddev
)
4583 rdev
->new_data_offset
= rdev
->data_offset
;
4587 static struct md_sysfs_entry md_reshape_position
=
4588 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4589 reshape_position_store
);
4592 reshape_direction_show(struct mddev
*mddev
, char *page
)
4594 return sprintf(page
, "%s\n",
4595 mddev
->reshape_backwards
? "backwards" : "forwards");
4599 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4602 if (cmd_match(buf
, "forwards"))
4604 else if (cmd_match(buf
, "backwards"))
4608 if (mddev
->reshape_backwards
== backwards
)
4611 /* check if we are allowed to change */
4612 if (mddev
->delta_disks
)
4615 if (mddev
->persistent
&&
4616 mddev
->major_version
== 0)
4619 mddev
->reshape_backwards
= backwards
;
4623 static struct md_sysfs_entry md_reshape_direction
=
4624 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4625 reshape_direction_store
);
4628 array_size_show(struct mddev
*mddev
, char *page
)
4630 if (mddev
->external_size
)
4631 return sprintf(page
, "%llu\n",
4632 (unsigned long long)mddev
->array_sectors
/2);
4634 return sprintf(page
, "default\n");
4638 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4642 if (strncmp(buf
, "default", 7) == 0) {
4644 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4646 sectors
= mddev
->array_sectors
;
4648 mddev
->external_size
= 0;
4650 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4652 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4655 mddev
->external_size
= 1;
4658 mddev
->array_sectors
= sectors
;
4660 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4661 revalidate_disk(mddev
->gendisk
);
4666 static struct md_sysfs_entry md_array_size
=
4667 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4670 static struct attribute
*md_default_attrs
[] = {
4673 &md_raid_disks
.attr
,
4674 &md_chunk_size
.attr
,
4676 &md_resync_start
.attr
,
4678 &md_new_device
.attr
,
4679 &md_safe_delay
.attr
,
4680 &md_array_state
.attr
,
4681 &md_reshape_position
.attr
,
4682 &md_reshape_direction
.attr
,
4683 &md_array_size
.attr
,
4684 &max_corr_read_errors
.attr
,
4688 static struct attribute
*md_redundancy_attrs
[] = {
4690 &md_mismatches
.attr
,
4693 &md_sync_speed
.attr
,
4694 &md_sync_force_parallel
.attr
,
4695 &md_sync_completed
.attr
,
4698 &md_suspend_lo
.attr
,
4699 &md_suspend_hi
.attr
,
4704 static struct attribute_group md_redundancy_group
= {
4706 .attrs
= md_redundancy_attrs
,
4711 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4713 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4714 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4719 spin_lock(&all_mddevs_lock
);
4720 if (list_empty(&mddev
->all_mddevs
)) {
4721 spin_unlock(&all_mddevs_lock
);
4725 spin_unlock(&all_mddevs_lock
);
4727 rv
= mddev_lock(mddev
);
4729 rv
= entry
->show(mddev
, page
);
4730 mddev_unlock(mddev
);
4737 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4738 const char *page
, size_t length
)
4740 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4741 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4746 if (!capable(CAP_SYS_ADMIN
))
4748 spin_lock(&all_mddevs_lock
);
4749 if (list_empty(&mddev
->all_mddevs
)) {
4750 spin_unlock(&all_mddevs_lock
);
4754 spin_unlock(&all_mddevs_lock
);
4755 if (entry
->store
== new_dev_store
)
4756 flush_workqueue(md_misc_wq
);
4757 rv
= mddev_lock(mddev
);
4759 rv
= entry
->store(mddev
, page
, length
);
4760 mddev_unlock(mddev
);
4766 static void md_free(struct kobject
*ko
)
4768 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4770 if (mddev
->sysfs_state
)
4771 sysfs_put(mddev
->sysfs_state
);
4773 if (mddev
->gendisk
) {
4774 del_gendisk(mddev
->gendisk
);
4775 put_disk(mddev
->gendisk
);
4778 blk_cleanup_queue(mddev
->queue
);
4783 static const struct sysfs_ops md_sysfs_ops
= {
4784 .show
= md_attr_show
,
4785 .store
= md_attr_store
,
4787 static struct kobj_type md_ktype
= {
4789 .sysfs_ops
= &md_sysfs_ops
,
4790 .default_attrs
= md_default_attrs
,
4795 static void mddev_delayed_delete(struct work_struct
*ws
)
4797 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4799 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4800 kobject_del(&mddev
->kobj
);
4801 kobject_put(&mddev
->kobj
);
4804 static int md_alloc(dev_t dev
, char *name
)
4806 static DEFINE_MUTEX(disks_mutex
);
4807 struct mddev
*mddev
= mddev_find(dev
);
4808 struct gendisk
*disk
;
4817 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4818 shift
= partitioned
? MdpMinorShift
: 0;
4819 unit
= MINOR(mddev
->unit
) >> shift
;
4821 /* wait for any previous instance of this device to be
4822 * completely removed (mddev_delayed_delete).
4824 flush_workqueue(md_misc_wq
);
4826 mutex_lock(&disks_mutex
);
4832 /* Need to ensure that 'name' is not a duplicate.
4834 struct mddev
*mddev2
;
4835 spin_lock(&all_mddevs_lock
);
4837 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4838 if (mddev2
->gendisk
&&
4839 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4840 spin_unlock(&all_mddevs_lock
);
4843 spin_unlock(&all_mddevs_lock
);
4847 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4850 mddev
->queue
->queuedata
= mddev
;
4852 blk_queue_make_request(mddev
->queue
, md_make_request
);
4853 blk_set_stacking_limits(&mddev
->queue
->limits
);
4855 disk
= alloc_disk(1 << shift
);
4857 blk_cleanup_queue(mddev
->queue
);
4858 mddev
->queue
= NULL
;
4861 disk
->major
= MAJOR(mddev
->unit
);
4862 disk
->first_minor
= unit
<< shift
;
4864 strcpy(disk
->disk_name
, name
);
4865 else if (partitioned
)
4866 sprintf(disk
->disk_name
, "md_d%d", unit
);
4868 sprintf(disk
->disk_name
, "md%d", unit
);
4869 disk
->fops
= &md_fops
;
4870 disk
->private_data
= mddev
;
4871 disk
->queue
= mddev
->queue
;
4872 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4873 /* Allow extended partitions. This makes the
4874 * 'mdp' device redundant, but we can't really
4877 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4878 mddev
->gendisk
= disk
;
4879 /* As soon as we call add_disk(), another thread could get
4880 * through to md_open, so make sure it doesn't get too far
4882 mutex_lock(&mddev
->open_mutex
);
4885 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4886 &disk_to_dev(disk
)->kobj
, "%s", "md");
4888 /* This isn't possible, but as kobject_init_and_add is marked
4889 * __must_check, we must do something with the result
4891 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4895 if (mddev
->kobj
.sd
&&
4896 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4897 printk(KERN_DEBUG
"pointless warning\n");
4898 mutex_unlock(&mddev
->open_mutex
);
4900 mutex_unlock(&disks_mutex
);
4901 if (!error
&& mddev
->kobj
.sd
) {
4902 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4903 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4909 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4911 md_alloc(dev
, NULL
);
4915 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4917 /* val must be "md_*" where * is not all digits.
4918 * We allocate an array with a large free minor number, and
4919 * set the name to val. val must not already be an active name.
4921 int len
= strlen(val
);
4922 char buf
[DISK_NAME_LEN
];
4924 while (len
&& val
[len
-1] == '\n')
4926 if (len
>= DISK_NAME_LEN
)
4928 strlcpy(buf
, val
, len
+1);
4929 if (strncmp(buf
, "md_", 3) != 0)
4931 return md_alloc(0, buf
);
4934 static void md_safemode_timeout(unsigned long data
)
4936 struct mddev
*mddev
= (struct mddev
*) data
;
4938 if (!atomic_read(&mddev
->writes_pending
)) {
4939 mddev
->safemode
= 1;
4940 if (mddev
->external
)
4941 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4943 md_wakeup_thread(mddev
->thread
);
4946 static int start_dirty_degraded
;
4948 int md_run(struct mddev
*mddev
)
4951 struct md_rdev
*rdev
;
4952 struct md_personality
*pers
;
4954 if (list_empty(&mddev
->disks
))
4955 /* cannot run an array with no devices.. */
4960 /* Cannot run until previous stop completes properly */
4961 if (mddev
->sysfs_active
)
4965 * Analyze all RAID superblock(s)
4967 if (!mddev
->raid_disks
) {
4968 if (!mddev
->persistent
)
4973 if (mddev
->level
!= LEVEL_NONE
)
4974 request_module("md-level-%d", mddev
->level
);
4975 else if (mddev
->clevel
[0])
4976 request_module("md-%s", mddev
->clevel
);
4979 * Drop all container device buffers, from now on
4980 * the only valid external interface is through the md
4983 rdev_for_each(rdev
, mddev
) {
4984 if (test_bit(Faulty
, &rdev
->flags
))
4986 sync_blockdev(rdev
->bdev
);
4987 invalidate_bdev(rdev
->bdev
);
4989 /* perform some consistency tests on the device.
4990 * We don't want the data to overlap the metadata,
4991 * Internal Bitmap issues have been handled elsewhere.
4993 if (rdev
->meta_bdev
) {
4994 /* Nothing to check */;
4995 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4996 if (mddev
->dev_sectors
&&
4997 rdev
->data_offset
+ mddev
->dev_sectors
4999 printk("md: %s: data overlaps metadata\n",
5004 if (rdev
->sb_start
+ rdev
->sb_size
/512
5005 > rdev
->data_offset
) {
5006 printk("md: %s: metadata overlaps data\n",
5011 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5014 if (mddev
->bio_set
== NULL
)
5015 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5017 spin_lock(&pers_lock
);
5018 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5019 if (!pers
|| !try_module_get(pers
->owner
)) {
5020 spin_unlock(&pers_lock
);
5021 if (mddev
->level
!= LEVEL_NONE
)
5022 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5025 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5030 spin_unlock(&pers_lock
);
5031 if (mddev
->level
!= pers
->level
) {
5032 mddev
->level
= pers
->level
;
5033 mddev
->new_level
= pers
->level
;
5035 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5037 if (mddev
->reshape_position
!= MaxSector
&&
5038 pers
->start_reshape
== NULL
) {
5039 /* This personality cannot handle reshaping... */
5041 module_put(pers
->owner
);
5045 if (pers
->sync_request
) {
5046 /* Warn if this is a potentially silly
5049 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5050 struct md_rdev
*rdev2
;
5053 rdev_for_each(rdev
, mddev
)
5054 rdev_for_each(rdev2
, mddev
) {
5056 rdev
->bdev
->bd_contains
==
5057 rdev2
->bdev
->bd_contains
) {
5059 "%s: WARNING: %s appears to be"
5060 " on the same physical disk as"
5063 bdevname(rdev
->bdev
,b
),
5064 bdevname(rdev2
->bdev
,b2
));
5071 "True protection against single-disk"
5072 " failure might be compromised.\n");
5075 mddev
->recovery
= 0;
5076 /* may be over-ridden by personality */
5077 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5079 mddev
->ok_start_degraded
= start_dirty_degraded
;
5081 if (start_readonly
&& mddev
->ro
== 0)
5082 mddev
->ro
= 2; /* read-only, but switch on first write */
5084 err
= mddev
->pers
->run(mddev
);
5086 printk(KERN_ERR
"md: pers->run() failed ...\n");
5087 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5088 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5089 " but 'external_size' not in effect?\n", __func__
);
5091 "md: invalid array_size %llu > default size %llu\n",
5092 (unsigned long long)mddev
->array_sectors
/ 2,
5093 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5095 mddev
->pers
->stop(mddev
);
5097 if (err
== 0 && mddev
->pers
->sync_request
&&
5098 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5099 err
= bitmap_create(mddev
);
5101 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5102 mdname(mddev
), err
);
5103 mddev
->pers
->stop(mddev
);
5107 module_put(mddev
->pers
->owner
);
5109 bitmap_destroy(mddev
);
5112 if (mddev
->pers
->sync_request
) {
5113 if (mddev
->kobj
.sd
&&
5114 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5116 "md: cannot register extra attributes for %s\n",
5118 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5119 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5122 atomic_set(&mddev
->writes_pending
,0);
5123 atomic_set(&mddev
->max_corr_read_errors
,
5124 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5125 mddev
->safemode
= 0;
5126 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5127 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5128 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5132 rdev_for_each(rdev
, mddev
)
5133 if (rdev
->raid_disk
>= 0)
5134 if (sysfs_link_rdev(mddev
, rdev
))
5135 /* failure here is OK */;
5137 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5140 md_update_sb(mddev
, 0);
5142 md_new_event(mddev
);
5143 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5144 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5145 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5148 EXPORT_SYMBOL_GPL(md_run
);
5150 static int do_md_run(struct mddev
*mddev
)
5154 err
= md_run(mddev
);
5157 err
= bitmap_load(mddev
);
5159 bitmap_destroy(mddev
);
5163 md_wakeup_thread(mddev
->thread
);
5164 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5166 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5167 revalidate_disk(mddev
->gendisk
);
5169 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5174 static int restart_array(struct mddev
*mddev
)
5176 struct gendisk
*disk
= mddev
->gendisk
;
5178 /* Complain if it has no devices */
5179 if (list_empty(&mddev
->disks
))
5185 mddev
->safemode
= 0;
5187 set_disk_ro(disk
, 0);
5188 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5190 /* Kick recovery or resync if necessary */
5191 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5192 md_wakeup_thread(mddev
->thread
);
5193 md_wakeup_thread(mddev
->sync_thread
);
5194 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5198 /* similar to deny_write_access, but accounts for our holding a reference
5199 * to the file ourselves */
5200 static int deny_bitmap_write_access(struct file
* file
)
5202 struct inode
*inode
= file
->f_mapping
->host
;
5204 spin_lock(&inode
->i_lock
);
5205 if (atomic_read(&inode
->i_writecount
) > 1) {
5206 spin_unlock(&inode
->i_lock
);
5209 atomic_set(&inode
->i_writecount
, -1);
5210 spin_unlock(&inode
->i_lock
);
5215 void restore_bitmap_write_access(struct file
*file
)
5217 struct inode
*inode
= file
->f_mapping
->host
;
5219 spin_lock(&inode
->i_lock
);
5220 atomic_set(&inode
->i_writecount
, 1);
5221 spin_unlock(&inode
->i_lock
);
5224 static void md_clean(struct mddev
*mddev
)
5226 mddev
->array_sectors
= 0;
5227 mddev
->external_size
= 0;
5228 mddev
->dev_sectors
= 0;
5229 mddev
->raid_disks
= 0;
5230 mddev
->recovery_cp
= 0;
5231 mddev
->resync_min
= 0;
5232 mddev
->resync_max
= MaxSector
;
5233 mddev
->reshape_position
= MaxSector
;
5234 mddev
->external
= 0;
5235 mddev
->persistent
= 0;
5236 mddev
->level
= LEVEL_NONE
;
5237 mddev
->clevel
[0] = 0;
5240 mddev
->metadata_type
[0] = 0;
5241 mddev
->chunk_sectors
= 0;
5242 mddev
->ctime
= mddev
->utime
= 0;
5244 mddev
->max_disks
= 0;
5246 mddev
->can_decrease_events
= 0;
5247 mddev
->delta_disks
= 0;
5248 mddev
->reshape_backwards
= 0;
5249 mddev
->new_level
= LEVEL_NONE
;
5250 mddev
->new_layout
= 0;
5251 mddev
->new_chunk_sectors
= 0;
5252 mddev
->curr_resync
= 0;
5253 atomic64_set(&mddev
->resync_mismatches
, 0);
5254 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5255 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5256 mddev
->recovery
= 0;
5259 mddev
->degraded
= 0;
5260 mddev
->safemode
= 0;
5261 mddev
->merge_check_needed
= 0;
5262 mddev
->bitmap_info
.offset
= 0;
5263 mddev
->bitmap_info
.default_offset
= 0;
5264 mddev
->bitmap_info
.default_space
= 0;
5265 mddev
->bitmap_info
.chunksize
= 0;
5266 mddev
->bitmap_info
.daemon_sleep
= 0;
5267 mddev
->bitmap_info
.max_write_behind
= 0;
5270 static void __md_stop_writes(struct mddev
*mddev
)
5272 if (mddev
->sync_thread
) {
5273 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5274 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5275 reap_sync_thread(mddev
);
5278 del_timer_sync(&mddev
->safemode_timer
);
5280 bitmap_flush(mddev
);
5281 md_super_wait(mddev
);
5283 if (!mddev
->in_sync
|| mddev
->flags
) {
5284 /* mark array as shutdown cleanly */
5286 md_update_sb(mddev
, 1);
5290 void md_stop_writes(struct mddev
*mddev
)
5293 __md_stop_writes(mddev
);
5294 mddev_unlock(mddev
);
5296 EXPORT_SYMBOL_GPL(md_stop_writes
);
5298 static void __md_stop(struct mddev
*mddev
)
5301 mddev
->pers
->stop(mddev
);
5302 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5303 mddev
->to_remove
= &md_redundancy_group
;
5304 module_put(mddev
->pers
->owner
);
5306 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5309 void md_stop(struct mddev
*mddev
)
5311 /* stop the array and free an attached data structures.
5312 * This is called from dm-raid
5315 bitmap_destroy(mddev
);
5317 bioset_free(mddev
->bio_set
);
5320 EXPORT_SYMBOL_GPL(md_stop
);
5322 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5325 mutex_lock(&mddev
->open_mutex
);
5326 if (atomic_read(&mddev
->openers
) > !!bdev
) {
5327 printk("md: %s still in use.\n",mdname(mddev
));
5332 sync_blockdev(bdev
);
5334 __md_stop_writes(mddev
);
5340 set_disk_ro(mddev
->gendisk
, 1);
5341 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5342 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5346 mutex_unlock(&mddev
->open_mutex
);
5351 * 0 - completely stop and dis-assemble array
5352 * 2 - stop but do not disassemble array
5354 static int do_md_stop(struct mddev
* mddev
, int mode
,
5355 struct block_device
*bdev
)
5357 struct gendisk
*disk
= mddev
->gendisk
;
5358 struct md_rdev
*rdev
;
5360 mutex_lock(&mddev
->open_mutex
);
5361 if (atomic_read(&mddev
->openers
) > !!bdev
||
5362 mddev
->sysfs_active
) {
5363 printk("md: %s still in use.\n",mdname(mddev
));
5364 mutex_unlock(&mddev
->open_mutex
);
5368 /* It is possible IO was issued on some other
5369 * open file which was closed before we took ->open_mutex.
5370 * As that was not the last close __blkdev_put will not
5371 * have called sync_blockdev, so we must.
5373 sync_blockdev(bdev
);
5377 set_disk_ro(disk
, 0);
5379 __md_stop_writes(mddev
);
5381 mddev
->queue
->merge_bvec_fn
= NULL
;
5382 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5384 /* tell userspace to handle 'inactive' */
5385 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5387 rdev_for_each(rdev
, mddev
)
5388 if (rdev
->raid_disk
>= 0)
5389 sysfs_unlink_rdev(mddev
, rdev
);
5391 set_capacity(disk
, 0);
5392 mutex_unlock(&mddev
->open_mutex
);
5394 revalidate_disk(disk
);
5399 mutex_unlock(&mddev
->open_mutex
);
5401 * Free resources if final stop
5404 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5406 bitmap_destroy(mddev
);
5407 if (mddev
->bitmap_info
.file
) {
5408 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5409 fput(mddev
->bitmap_info
.file
);
5410 mddev
->bitmap_info
.file
= NULL
;
5412 mddev
->bitmap_info
.offset
= 0;
5414 export_array(mddev
);
5417 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5418 if (mddev
->hold_active
== UNTIL_STOP
)
5419 mddev
->hold_active
= 0;
5421 blk_integrity_unregister(disk
);
5422 md_new_event(mddev
);
5423 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5428 static void autorun_array(struct mddev
*mddev
)
5430 struct md_rdev
*rdev
;
5433 if (list_empty(&mddev
->disks
))
5436 printk(KERN_INFO
"md: running: ");
5438 rdev_for_each(rdev
, mddev
) {
5439 char b
[BDEVNAME_SIZE
];
5440 printk("<%s>", bdevname(rdev
->bdev
,b
));
5444 err
= do_md_run(mddev
);
5446 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5447 do_md_stop(mddev
, 0, NULL
);
5452 * lets try to run arrays based on all disks that have arrived
5453 * until now. (those are in pending_raid_disks)
5455 * the method: pick the first pending disk, collect all disks with
5456 * the same UUID, remove all from the pending list and put them into
5457 * the 'same_array' list. Then order this list based on superblock
5458 * update time (freshest comes first), kick out 'old' disks and
5459 * compare superblocks. If everything's fine then run it.
5461 * If "unit" is allocated, then bump its reference count
5463 static void autorun_devices(int part
)
5465 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5466 struct mddev
*mddev
;
5467 char b
[BDEVNAME_SIZE
];
5469 printk(KERN_INFO
"md: autorun ...\n");
5470 while (!list_empty(&pending_raid_disks
)) {
5473 LIST_HEAD(candidates
);
5474 rdev0
= list_entry(pending_raid_disks
.next
,
5475 struct md_rdev
, same_set
);
5477 printk(KERN_INFO
"md: considering %s ...\n",
5478 bdevname(rdev0
->bdev
,b
));
5479 INIT_LIST_HEAD(&candidates
);
5480 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5481 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5482 printk(KERN_INFO
"md: adding %s ...\n",
5483 bdevname(rdev
->bdev
,b
));
5484 list_move(&rdev
->same_set
, &candidates
);
5487 * now we have a set of devices, with all of them having
5488 * mostly sane superblocks. It's time to allocate the
5492 dev
= MKDEV(mdp_major
,
5493 rdev0
->preferred_minor
<< MdpMinorShift
);
5494 unit
= MINOR(dev
) >> MdpMinorShift
;
5496 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5499 if (rdev0
->preferred_minor
!= unit
) {
5500 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5501 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5505 md_probe(dev
, NULL
, NULL
);
5506 mddev
= mddev_find(dev
);
5507 if (!mddev
|| !mddev
->gendisk
) {
5511 "md: cannot allocate memory for md drive.\n");
5514 if (mddev_lock(mddev
))
5515 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5517 else if (mddev
->raid_disks
|| mddev
->major_version
5518 || !list_empty(&mddev
->disks
)) {
5520 "md: %s already running, cannot run %s\n",
5521 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5522 mddev_unlock(mddev
);
5524 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5525 mddev
->persistent
= 1;
5526 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5527 list_del_init(&rdev
->same_set
);
5528 if (bind_rdev_to_array(rdev
, mddev
))
5531 autorun_array(mddev
);
5532 mddev_unlock(mddev
);
5534 /* on success, candidates will be empty, on error
5537 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5538 list_del_init(&rdev
->same_set
);
5543 printk(KERN_INFO
"md: ... autorun DONE.\n");
5545 #endif /* !MODULE */
5547 static int get_version(void __user
* arg
)
5551 ver
.major
= MD_MAJOR_VERSION
;
5552 ver
.minor
= MD_MINOR_VERSION
;
5553 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5555 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5561 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5563 mdu_array_info_t info
;
5564 int nr
,working
,insync
,failed
,spare
;
5565 struct md_rdev
*rdev
;
5567 nr
= working
= insync
= failed
= spare
= 0;
5569 rdev_for_each_rcu(rdev
, mddev
) {
5571 if (test_bit(Faulty
, &rdev
->flags
))
5575 if (test_bit(In_sync
, &rdev
->flags
))
5583 info
.major_version
= mddev
->major_version
;
5584 info
.minor_version
= mddev
->minor_version
;
5585 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5586 info
.ctime
= mddev
->ctime
;
5587 info
.level
= mddev
->level
;
5588 info
.size
= mddev
->dev_sectors
/ 2;
5589 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5592 info
.raid_disks
= mddev
->raid_disks
;
5593 info
.md_minor
= mddev
->md_minor
;
5594 info
.not_persistent
= !mddev
->persistent
;
5596 info
.utime
= mddev
->utime
;
5599 info
.state
= (1<<MD_SB_CLEAN
);
5600 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5601 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5602 info
.active_disks
= insync
;
5603 info
.working_disks
= working
;
5604 info
.failed_disks
= failed
;
5605 info
.spare_disks
= spare
;
5607 info
.layout
= mddev
->layout
;
5608 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5610 if (copy_to_user(arg
, &info
, sizeof(info
)))
5616 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5618 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5619 char *ptr
, *buf
= NULL
;
5622 if (md_allow_write(mddev
))
5623 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5625 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5630 /* bitmap disabled, zero the first byte and copy out */
5631 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5632 file
->pathname
[0] = '\0';
5636 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5640 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5641 buf
, sizeof(file
->pathname
));
5645 strcpy(file
->pathname
, ptr
);
5649 if (copy_to_user(arg
, file
, sizeof(*file
)))
5657 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5659 mdu_disk_info_t info
;
5660 struct md_rdev
*rdev
;
5662 if (copy_from_user(&info
, arg
, sizeof(info
)))
5666 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5668 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5669 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5670 info
.raid_disk
= rdev
->raid_disk
;
5672 if (test_bit(Faulty
, &rdev
->flags
))
5673 info
.state
|= (1<<MD_DISK_FAULTY
);
5674 else if (test_bit(In_sync
, &rdev
->flags
)) {
5675 info
.state
|= (1<<MD_DISK_ACTIVE
);
5676 info
.state
|= (1<<MD_DISK_SYNC
);
5678 if (test_bit(WriteMostly
, &rdev
->flags
))
5679 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5681 info
.major
= info
.minor
= 0;
5682 info
.raid_disk
= -1;
5683 info
.state
= (1<<MD_DISK_REMOVED
);
5687 if (copy_to_user(arg
, &info
, sizeof(info
)))
5693 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5695 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5696 struct md_rdev
*rdev
;
5697 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5699 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5702 if (!mddev
->raid_disks
) {
5704 /* expecting a device which has a superblock */
5705 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5708 "md: md_import_device returned %ld\n",
5710 return PTR_ERR(rdev
);
5712 if (!list_empty(&mddev
->disks
)) {
5713 struct md_rdev
*rdev0
5714 = list_entry(mddev
->disks
.next
,
5715 struct md_rdev
, same_set
);
5716 err
= super_types
[mddev
->major_version
]
5717 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5720 "md: %s has different UUID to %s\n",
5721 bdevname(rdev
->bdev
,b
),
5722 bdevname(rdev0
->bdev
,b2
));
5727 err
= bind_rdev_to_array(rdev
, mddev
);
5734 * add_new_disk can be used once the array is assembled
5735 * to add "hot spares". They must already have a superblock
5740 if (!mddev
->pers
->hot_add_disk
) {
5742 "%s: personality does not support diskops!\n",
5746 if (mddev
->persistent
)
5747 rdev
= md_import_device(dev
, mddev
->major_version
,
5748 mddev
->minor_version
);
5750 rdev
= md_import_device(dev
, -1, -1);
5753 "md: md_import_device returned %ld\n",
5755 return PTR_ERR(rdev
);
5757 /* set saved_raid_disk if appropriate */
5758 if (!mddev
->persistent
) {
5759 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5760 info
->raid_disk
< mddev
->raid_disks
) {
5761 rdev
->raid_disk
= info
->raid_disk
;
5762 set_bit(In_sync
, &rdev
->flags
);
5764 rdev
->raid_disk
= -1;
5766 super_types
[mddev
->major_version
].
5767 validate_super(mddev
, rdev
);
5768 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5769 rdev
->raid_disk
!= info
->raid_disk
) {
5770 /* This was a hot-add request, but events doesn't
5771 * match, so reject it.
5777 if (test_bit(In_sync
, &rdev
->flags
))
5778 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5780 rdev
->saved_raid_disk
= -1;
5782 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5783 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5784 set_bit(WriteMostly
, &rdev
->flags
);
5786 clear_bit(WriteMostly
, &rdev
->flags
);
5788 rdev
->raid_disk
= -1;
5789 err
= bind_rdev_to_array(rdev
, mddev
);
5790 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5791 /* If there is hot_add_disk but no hot_remove_disk
5792 * then added disks for geometry changes,
5793 * and should be added immediately.
5795 super_types
[mddev
->major_version
].
5796 validate_super(mddev
, rdev
);
5797 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5799 unbind_rdev_from_array(rdev
);
5804 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5806 md_update_sb(mddev
, 1);
5807 if (mddev
->degraded
)
5808 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5809 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5811 md_new_event(mddev
);
5812 md_wakeup_thread(mddev
->thread
);
5816 /* otherwise, add_new_disk is only allowed
5817 * for major_version==0 superblocks
5819 if (mddev
->major_version
!= 0) {
5820 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5825 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5827 rdev
= md_import_device(dev
, -1, 0);
5830 "md: error, md_import_device() returned %ld\n",
5832 return PTR_ERR(rdev
);
5834 rdev
->desc_nr
= info
->number
;
5835 if (info
->raid_disk
< mddev
->raid_disks
)
5836 rdev
->raid_disk
= info
->raid_disk
;
5838 rdev
->raid_disk
= -1;
5840 if (rdev
->raid_disk
< mddev
->raid_disks
)
5841 if (info
->state
& (1<<MD_DISK_SYNC
))
5842 set_bit(In_sync
, &rdev
->flags
);
5844 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5845 set_bit(WriteMostly
, &rdev
->flags
);
5847 if (!mddev
->persistent
) {
5848 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5849 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5851 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5852 rdev
->sectors
= rdev
->sb_start
;
5854 err
= bind_rdev_to_array(rdev
, mddev
);
5864 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5866 char b
[BDEVNAME_SIZE
];
5867 struct md_rdev
*rdev
;
5869 rdev
= find_rdev(mddev
, dev
);
5873 if (rdev
->raid_disk
>= 0)
5876 kick_rdev_from_array(rdev
);
5877 md_update_sb(mddev
, 1);
5878 md_new_event(mddev
);
5882 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5883 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5887 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5889 char b
[BDEVNAME_SIZE
];
5891 struct md_rdev
*rdev
;
5896 if (mddev
->major_version
!= 0) {
5897 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5898 " version-0 superblocks.\n",
5902 if (!mddev
->pers
->hot_add_disk
) {
5904 "%s: personality does not support diskops!\n",
5909 rdev
= md_import_device(dev
, -1, 0);
5912 "md: error, md_import_device() returned %ld\n",
5917 if (mddev
->persistent
)
5918 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5920 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5922 rdev
->sectors
= rdev
->sb_start
;
5924 if (test_bit(Faulty
, &rdev
->flags
)) {
5926 "md: can not hot-add faulty %s disk to %s!\n",
5927 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5931 clear_bit(In_sync
, &rdev
->flags
);
5933 rdev
->saved_raid_disk
= -1;
5934 err
= bind_rdev_to_array(rdev
, mddev
);
5939 * The rest should better be atomic, we can have disk failures
5940 * noticed in interrupt contexts ...
5943 rdev
->raid_disk
= -1;
5945 md_update_sb(mddev
, 1);
5948 * Kick recovery, maybe this spare has to be added to the
5949 * array immediately.
5951 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5952 md_wakeup_thread(mddev
->thread
);
5953 md_new_event(mddev
);
5961 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5966 if (!mddev
->pers
->quiesce
)
5968 if (mddev
->recovery
|| mddev
->sync_thread
)
5970 /* we should be able to change the bitmap.. */
5976 return -EEXIST
; /* cannot add when bitmap is present */
5977 mddev
->bitmap_info
.file
= fget(fd
);
5979 if (mddev
->bitmap_info
.file
== NULL
) {
5980 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5985 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5987 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5989 fput(mddev
->bitmap_info
.file
);
5990 mddev
->bitmap_info
.file
= NULL
;
5993 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5994 } else if (mddev
->bitmap
== NULL
)
5995 return -ENOENT
; /* cannot remove what isn't there */
5998 mddev
->pers
->quiesce(mddev
, 1);
6000 err
= bitmap_create(mddev
);
6002 err
= bitmap_load(mddev
);
6004 if (fd
< 0 || err
) {
6005 bitmap_destroy(mddev
);
6006 fd
= -1; /* make sure to put the file */
6008 mddev
->pers
->quiesce(mddev
, 0);
6011 if (mddev
->bitmap_info
.file
) {
6012 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6013 fput(mddev
->bitmap_info
.file
);
6015 mddev
->bitmap_info
.file
= NULL
;
6022 * set_array_info is used two different ways
6023 * The original usage is when creating a new array.
6024 * In this usage, raid_disks is > 0 and it together with
6025 * level, size, not_persistent,layout,chunksize determine the
6026 * shape of the array.
6027 * This will always create an array with a type-0.90.0 superblock.
6028 * The newer usage is when assembling an array.
6029 * In this case raid_disks will be 0, and the major_version field is
6030 * use to determine which style super-blocks are to be found on the devices.
6031 * The minor and patch _version numbers are also kept incase the
6032 * super_block handler wishes to interpret them.
6034 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6037 if (info
->raid_disks
== 0) {
6038 /* just setting version number for superblock loading */
6039 if (info
->major_version
< 0 ||
6040 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6041 super_types
[info
->major_version
].name
== NULL
) {
6042 /* maybe try to auto-load a module? */
6044 "md: superblock version %d not known\n",
6045 info
->major_version
);
6048 mddev
->major_version
= info
->major_version
;
6049 mddev
->minor_version
= info
->minor_version
;
6050 mddev
->patch_version
= info
->patch_version
;
6051 mddev
->persistent
= !info
->not_persistent
;
6052 /* ensure mddev_put doesn't delete this now that there
6053 * is some minimal configuration.
6055 mddev
->ctime
= get_seconds();
6058 mddev
->major_version
= MD_MAJOR_VERSION
;
6059 mddev
->minor_version
= MD_MINOR_VERSION
;
6060 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6061 mddev
->ctime
= get_seconds();
6063 mddev
->level
= info
->level
;
6064 mddev
->clevel
[0] = 0;
6065 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6066 mddev
->raid_disks
= info
->raid_disks
;
6067 /* don't set md_minor, it is determined by which /dev/md* was
6070 if (info
->state
& (1<<MD_SB_CLEAN
))
6071 mddev
->recovery_cp
= MaxSector
;
6073 mddev
->recovery_cp
= 0;
6074 mddev
->persistent
= ! info
->not_persistent
;
6075 mddev
->external
= 0;
6077 mddev
->layout
= info
->layout
;
6078 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6080 mddev
->max_disks
= MD_SB_DISKS
;
6082 if (mddev
->persistent
)
6084 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6086 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6087 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6088 mddev
->bitmap_info
.offset
= 0;
6090 mddev
->reshape_position
= MaxSector
;
6093 * Generate a 128 bit UUID
6095 get_random_bytes(mddev
->uuid
, 16);
6097 mddev
->new_level
= mddev
->level
;
6098 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6099 mddev
->new_layout
= mddev
->layout
;
6100 mddev
->delta_disks
= 0;
6101 mddev
->reshape_backwards
= 0;
6106 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6108 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6110 if (mddev
->external_size
)
6113 mddev
->array_sectors
= array_sectors
;
6115 EXPORT_SYMBOL(md_set_array_sectors
);
6117 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6119 struct md_rdev
*rdev
;
6121 int fit
= (num_sectors
== 0);
6123 if (mddev
->pers
->resize
== NULL
)
6125 /* The "num_sectors" is the number of sectors of each device that
6126 * is used. This can only make sense for arrays with redundancy.
6127 * linear and raid0 always use whatever space is available. We can only
6128 * consider changing this number if no resync or reconstruction is
6129 * happening, and if the new size is acceptable. It must fit before the
6130 * sb_start or, if that is <data_offset, it must fit before the size
6131 * of each device. If num_sectors is zero, we find the largest size
6134 if (mddev
->sync_thread
)
6137 rdev_for_each(rdev
, mddev
) {
6138 sector_t avail
= rdev
->sectors
;
6140 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6141 num_sectors
= avail
;
6142 if (avail
< num_sectors
)
6145 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6147 revalidate_disk(mddev
->gendisk
);
6151 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6154 struct md_rdev
*rdev
;
6155 /* change the number of raid disks */
6156 if (mddev
->pers
->check_reshape
== NULL
)
6158 if (raid_disks
<= 0 ||
6159 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6161 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6164 rdev_for_each(rdev
, mddev
) {
6165 if (mddev
->raid_disks
< raid_disks
&&
6166 rdev
->data_offset
< rdev
->new_data_offset
)
6168 if (mddev
->raid_disks
> raid_disks
&&
6169 rdev
->data_offset
> rdev
->new_data_offset
)
6173 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6174 if (mddev
->delta_disks
< 0)
6175 mddev
->reshape_backwards
= 1;
6176 else if (mddev
->delta_disks
> 0)
6177 mddev
->reshape_backwards
= 0;
6179 rv
= mddev
->pers
->check_reshape(mddev
);
6181 mddev
->delta_disks
= 0;
6182 mddev
->reshape_backwards
= 0;
6189 * update_array_info is used to change the configuration of an
6191 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6192 * fields in the info are checked against the array.
6193 * Any differences that cannot be handled will cause an error.
6194 * Normally, only one change can be managed at a time.
6196 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6202 /* calculate expected state,ignoring low bits */
6203 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6204 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6206 if (mddev
->major_version
!= info
->major_version
||
6207 mddev
->minor_version
!= info
->minor_version
||
6208 /* mddev->patch_version != info->patch_version || */
6209 mddev
->ctime
!= info
->ctime
||
6210 mddev
->level
!= info
->level
||
6211 /* mddev->layout != info->layout || */
6212 !mddev
->persistent
!= info
->not_persistent
||
6213 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6214 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6215 ((state
^info
->state
) & 0xfffffe00)
6218 /* Check there is only one change */
6219 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6221 if (mddev
->raid_disks
!= info
->raid_disks
)
6223 if (mddev
->layout
!= info
->layout
)
6225 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6232 if (mddev
->layout
!= info
->layout
) {
6234 * we don't need to do anything at the md level, the
6235 * personality will take care of it all.
6237 if (mddev
->pers
->check_reshape
== NULL
)
6240 mddev
->new_layout
= info
->layout
;
6241 rv
= mddev
->pers
->check_reshape(mddev
);
6243 mddev
->new_layout
= mddev
->layout
;
6247 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6248 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6250 if (mddev
->raid_disks
!= info
->raid_disks
)
6251 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6253 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6254 if (mddev
->pers
->quiesce
== NULL
)
6256 if (mddev
->recovery
|| mddev
->sync_thread
)
6258 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6259 /* add the bitmap */
6262 if (mddev
->bitmap_info
.default_offset
== 0)
6264 mddev
->bitmap_info
.offset
=
6265 mddev
->bitmap_info
.default_offset
;
6266 mddev
->bitmap_info
.space
=
6267 mddev
->bitmap_info
.default_space
;
6268 mddev
->pers
->quiesce(mddev
, 1);
6269 rv
= bitmap_create(mddev
);
6271 rv
= bitmap_load(mddev
);
6273 bitmap_destroy(mddev
);
6274 mddev
->pers
->quiesce(mddev
, 0);
6276 /* remove the bitmap */
6279 if (mddev
->bitmap
->storage
.file
)
6281 mddev
->pers
->quiesce(mddev
, 1);
6282 bitmap_destroy(mddev
);
6283 mddev
->pers
->quiesce(mddev
, 0);
6284 mddev
->bitmap_info
.offset
= 0;
6287 md_update_sb(mddev
, 1);
6291 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6293 struct md_rdev
*rdev
;
6296 if (mddev
->pers
== NULL
)
6300 rdev
= find_rdev_rcu(mddev
, dev
);
6304 md_error(mddev
, rdev
);
6305 if (!test_bit(Faulty
, &rdev
->flags
))
6313 * We have a problem here : there is no easy way to give a CHS
6314 * virtual geometry. We currently pretend that we have a 2 heads
6315 * 4 sectors (with a BIG number of cylinders...). This drives
6316 * dosfs just mad... ;-)
6318 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6320 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6324 geo
->cylinders
= mddev
->array_sectors
/ 8;
6328 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6329 unsigned int cmd
, unsigned long arg
)
6332 void __user
*argp
= (void __user
*)arg
;
6333 struct mddev
*mddev
= NULL
;
6338 case GET_ARRAY_INFO
:
6342 if (!capable(CAP_SYS_ADMIN
))
6347 * Commands dealing with the RAID driver but not any
6352 err
= get_version(argp
);
6355 case PRINT_RAID_DEBUG
:
6363 autostart_arrays(arg
);
6370 * Commands creating/starting a new array:
6373 mddev
= bdev
->bd_disk
->private_data
;
6380 /* Some actions do not requires the mutex */
6382 case GET_ARRAY_INFO
:
6383 if (!mddev
->raid_disks
&& !mddev
->external
)
6386 err
= get_array_info(mddev
, argp
);
6390 if (!mddev
->raid_disks
&& !mddev
->external
)
6393 err
= get_disk_info(mddev
, argp
);
6396 case SET_DISK_FAULTY
:
6397 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6401 if (cmd
== ADD_NEW_DISK
)
6402 /* need to ensure md_delayed_delete() has completed */
6403 flush_workqueue(md_misc_wq
);
6405 err
= mddev_lock(mddev
);
6408 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6413 if (cmd
== SET_ARRAY_INFO
) {
6414 mdu_array_info_t info
;
6416 memset(&info
, 0, sizeof(info
));
6417 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6422 err
= update_array_info(mddev
, &info
);
6424 printk(KERN_WARNING
"md: couldn't update"
6425 " array info. %d\n", err
);
6430 if (!list_empty(&mddev
->disks
)) {
6432 "md: array %s already has disks!\n",
6437 if (mddev
->raid_disks
) {
6439 "md: array %s already initialised!\n",
6444 err
= set_array_info(mddev
, &info
);
6446 printk(KERN_WARNING
"md: couldn't set"
6447 " array info. %d\n", err
);
6454 * Commands querying/configuring an existing array:
6456 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6457 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6458 if ((!mddev
->raid_disks
&& !mddev
->external
)
6459 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6460 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6461 && cmd
!= GET_BITMAP_FILE
) {
6467 * Commands even a read-only array can execute:
6470 case GET_BITMAP_FILE
:
6471 err
= get_bitmap_file(mddev
, argp
);
6474 case RESTART_ARRAY_RW
:
6475 err
= restart_array(mddev
);
6479 err
= do_md_stop(mddev
, 0, bdev
);
6483 err
= md_set_readonly(mddev
, bdev
);
6487 if (get_user(ro
, (int __user
*)(arg
))) {
6493 /* if the bdev is going readonly the value of mddev->ro
6494 * does not matter, no writes are coming
6499 /* are we are already prepared for writes? */
6503 /* transitioning to readauto need only happen for
6504 * arrays that call md_write_start
6507 err
= restart_array(mddev
);
6510 set_disk_ro(mddev
->gendisk
, 0);
6517 * The remaining ioctls are changing the state of the
6518 * superblock, so we do not allow them on read-only arrays.
6519 * However non-MD ioctls (e.g. get-size) will still come through
6520 * here and hit the 'default' below, so only disallow
6521 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6523 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6524 if (mddev
->ro
== 2) {
6526 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6527 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6528 md_wakeup_thread(mddev
->thread
);
6538 mdu_disk_info_t info
;
6539 if (copy_from_user(&info
, argp
, sizeof(info
)))
6542 err
= add_new_disk(mddev
, &info
);
6546 case HOT_REMOVE_DISK
:
6547 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6551 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6555 err
= do_md_run(mddev
);
6558 case SET_BITMAP_FILE
:
6559 err
= set_bitmap_file(mddev
, (int)arg
);
6569 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6571 mddev
->hold_active
= 0;
6572 mddev_unlock(mddev
);
6581 #ifdef CONFIG_COMPAT
6582 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6583 unsigned int cmd
, unsigned long arg
)
6586 case HOT_REMOVE_DISK
:
6588 case SET_DISK_FAULTY
:
6589 case SET_BITMAP_FILE
:
6590 /* These take in integer arg, do not convert */
6593 arg
= (unsigned long)compat_ptr(arg
);
6597 return md_ioctl(bdev
, mode
, cmd
, arg
);
6599 #endif /* CONFIG_COMPAT */
6601 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6604 * Succeed if we can lock the mddev, which confirms that
6605 * it isn't being stopped right now.
6607 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6613 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6614 /* we are racing with mddev_put which is discarding this
6618 /* Wait until bdev->bd_disk is definitely gone */
6619 flush_workqueue(md_misc_wq
);
6620 /* Then retry the open from the top */
6621 return -ERESTARTSYS
;
6623 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6625 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6629 atomic_inc(&mddev
->openers
);
6630 mutex_unlock(&mddev
->open_mutex
);
6632 check_disk_change(bdev
);
6637 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6639 struct mddev
*mddev
= disk
->private_data
;
6642 atomic_dec(&mddev
->openers
);
6648 static int md_media_changed(struct gendisk
*disk
)
6650 struct mddev
*mddev
= disk
->private_data
;
6652 return mddev
->changed
;
6655 static int md_revalidate(struct gendisk
*disk
)
6657 struct mddev
*mddev
= disk
->private_data
;
6662 static const struct block_device_operations md_fops
=
6664 .owner
= THIS_MODULE
,
6666 .release
= md_release
,
6668 #ifdef CONFIG_COMPAT
6669 .compat_ioctl
= md_compat_ioctl
,
6671 .getgeo
= md_getgeo
,
6672 .media_changed
= md_media_changed
,
6673 .revalidate_disk
= md_revalidate
,
6676 static int md_thread(void * arg
)
6678 struct md_thread
*thread
= arg
;
6681 * md_thread is a 'system-thread', it's priority should be very
6682 * high. We avoid resource deadlocks individually in each
6683 * raid personality. (RAID5 does preallocation) We also use RR and
6684 * the very same RT priority as kswapd, thus we will never get
6685 * into a priority inversion deadlock.
6687 * we definitely have to have equal or higher priority than
6688 * bdflush, otherwise bdflush will deadlock if there are too
6689 * many dirty RAID5 blocks.
6692 allow_signal(SIGKILL
);
6693 while (!kthread_should_stop()) {
6695 /* We need to wait INTERRUPTIBLE so that
6696 * we don't add to the load-average.
6697 * That means we need to be sure no signals are
6700 if (signal_pending(current
))
6701 flush_signals(current
);
6703 wait_event_interruptible_timeout
6705 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6706 || kthread_should_stop(),
6709 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6710 if (!kthread_should_stop())
6711 thread
->run(thread
);
6717 void md_wakeup_thread(struct md_thread
*thread
)
6720 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6721 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6722 wake_up(&thread
->wqueue
);
6726 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6727 struct mddev
*mddev
, const char *name
)
6729 struct md_thread
*thread
;
6731 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6735 init_waitqueue_head(&thread
->wqueue
);
6738 thread
->mddev
= mddev
;
6739 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6740 thread
->tsk
= kthread_run(md_thread
, thread
,
6742 mdname(thread
->mddev
),
6744 if (IS_ERR(thread
->tsk
)) {
6751 void md_unregister_thread(struct md_thread
**threadp
)
6753 struct md_thread
*thread
= *threadp
;
6756 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6757 /* Locking ensures that mddev_unlock does not wake_up a
6758 * non-existent thread
6760 spin_lock(&pers_lock
);
6762 spin_unlock(&pers_lock
);
6764 kthread_stop(thread
->tsk
);
6768 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6775 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6778 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6780 mddev
->pers
->error_handler(mddev
,rdev
);
6781 if (mddev
->degraded
)
6782 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6783 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6784 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6785 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6786 md_wakeup_thread(mddev
->thread
);
6787 if (mddev
->event_work
.func
)
6788 queue_work(md_misc_wq
, &mddev
->event_work
);
6789 md_new_event_inintr(mddev
);
6792 /* seq_file implementation /proc/mdstat */
6794 static void status_unused(struct seq_file
*seq
)
6797 struct md_rdev
*rdev
;
6799 seq_printf(seq
, "unused devices: ");
6801 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6802 char b
[BDEVNAME_SIZE
];
6804 seq_printf(seq
, "%s ",
6805 bdevname(rdev
->bdev
,b
));
6808 seq_printf(seq
, "<none>");
6810 seq_printf(seq
, "\n");
6814 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6816 sector_t max_sectors
, resync
, res
;
6817 unsigned long dt
, db
;
6820 unsigned int per_milli
;
6822 if (mddev
->curr_resync
<= 3)
6825 resync
= mddev
->curr_resync
6826 - atomic_read(&mddev
->recovery_active
);
6828 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6829 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6830 max_sectors
= mddev
->resync_max_sectors
;
6832 max_sectors
= mddev
->dev_sectors
;
6835 * Should not happen.
6841 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6842 * in a sector_t, and (max_sectors>>scale) will fit in a
6843 * u32, as those are the requirements for sector_div.
6844 * Thus 'scale' must be at least 10
6847 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6848 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6851 res
= (resync
>>scale
)*1000;
6852 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6856 int i
, x
= per_milli
/50, y
= 20-x
;
6857 seq_printf(seq
, "[");
6858 for (i
= 0; i
< x
; i
++)
6859 seq_printf(seq
, "=");
6860 seq_printf(seq
, ">");
6861 for (i
= 0; i
< y
; i
++)
6862 seq_printf(seq
, ".");
6863 seq_printf(seq
, "] ");
6865 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6866 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6868 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6870 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6871 "resync" : "recovery"))),
6872 per_milli
/10, per_milli
% 10,
6873 (unsigned long long) resync
/2,
6874 (unsigned long long) max_sectors
/2);
6877 * dt: time from mark until now
6878 * db: blocks written from mark until now
6879 * rt: remaining time
6881 * rt is a sector_t, so could be 32bit or 64bit.
6882 * So we divide before multiply in case it is 32bit and close
6884 * We scale the divisor (db) by 32 to avoid losing precision
6885 * near the end of resync when the number of remaining sectors
6887 * We then divide rt by 32 after multiplying by db to compensate.
6888 * The '+1' avoids division by zero if db is very small.
6890 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6892 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6893 - mddev
->resync_mark_cnt
;
6895 rt
= max_sectors
- resync
; /* number of remaining sectors */
6896 sector_div(rt
, db
/32+1);
6900 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6901 ((unsigned long)rt
% 60)/6);
6903 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6906 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6908 struct list_head
*tmp
;
6910 struct mddev
*mddev
;
6918 spin_lock(&all_mddevs_lock
);
6919 list_for_each(tmp
,&all_mddevs
)
6921 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6923 spin_unlock(&all_mddevs_lock
);
6926 spin_unlock(&all_mddevs_lock
);
6928 return (void*)2;/* tail */
6932 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6934 struct list_head
*tmp
;
6935 struct mddev
*next_mddev
, *mddev
= v
;
6941 spin_lock(&all_mddevs_lock
);
6943 tmp
= all_mddevs
.next
;
6945 tmp
= mddev
->all_mddevs
.next
;
6946 if (tmp
!= &all_mddevs
)
6947 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6949 next_mddev
= (void*)2;
6952 spin_unlock(&all_mddevs_lock
);
6960 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6962 struct mddev
*mddev
= v
;
6964 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6968 static int md_seq_show(struct seq_file
*seq
, void *v
)
6970 struct mddev
*mddev
= v
;
6972 struct md_rdev
*rdev
;
6974 if (v
== (void*)1) {
6975 struct md_personality
*pers
;
6976 seq_printf(seq
, "Personalities : ");
6977 spin_lock(&pers_lock
);
6978 list_for_each_entry(pers
, &pers_list
, list
)
6979 seq_printf(seq
, "[%s] ", pers
->name
);
6981 spin_unlock(&pers_lock
);
6982 seq_printf(seq
, "\n");
6983 seq
->poll_event
= atomic_read(&md_event_count
);
6986 if (v
== (void*)2) {
6991 if (mddev_lock(mddev
) < 0)
6994 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6995 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6996 mddev
->pers
? "" : "in");
6999 seq_printf(seq
, " (read-only)");
7001 seq_printf(seq
, " (auto-read-only)");
7002 seq_printf(seq
, " %s", mddev
->pers
->name
);
7006 rdev_for_each(rdev
, mddev
) {
7007 char b
[BDEVNAME_SIZE
];
7008 seq_printf(seq
, " %s[%d]",
7009 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7010 if (test_bit(WriteMostly
, &rdev
->flags
))
7011 seq_printf(seq
, "(W)");
7012 if (test_bit(Faulty
, &rdev
->flags
)) {
7013 seq_printf(seq
, "(F)");
7016 if (rdev
->raid_disk
< 0)
7017 seq_printf(seq
, "(S)"); /* spare */
7018 if (test_bit(Replacement
, &rdev
->flags
))
7019 seq_printf(seq
, "(R)");
7020 sectors
+= rdev
->sectors
;
7023 if (!list_empty(&mddev
->disks
)) {
7025 seq_printf(seq
, "\n %llu blocks",
7026 (unsigned long long)
7027 mddev
->array_sectors
/ 2);
7029 seq_printf(seq
, "\n %llu blocks",
7030 (unsigned long long)sectors
/ 2);
7032 if (mddev
->persistent
) {
7033 if (mddev
->major_version
!= 0 ||
7034 mddev
->minor_version
!= 90) {
7035 seq_printf(seq
," super %d.%d",
7036 mddev
->major_version
,
7037 mddev
->minor_version
);
7039 } else if (mddev
->external
)
7040 seq_printf(seq
, " super external:%s",
7041 mddev
->metadata_type
);
7043 seq_printf(seq
, " super non-persistent");
7046 mddev
->pers
->status(seq
, mddev
);
7047 seq_printf(seq
, "\n ");
7048 if (mddev
->pers
->sync_request
) {
7049 if (mddev
->curr_resync
> 2) {
7050 status_resync(seq
, mddev
);
7051 seq_printf(seq
, "\n ");
7052 } else if (mddev
->curr_resync
>= 1)
7053 seq_printf(seq
, "\tresync=DELAYED\n ");
7054 else if (mddev
->recovery_cp
< MaxSector
)
7055 seq_printf(seq
, "\tresync=PENDING\n ");
7058 seq_printf(seq
, "\n ");
7060 bitmap_status(seq
, mddev
->bitmap
);
7062 seq_printf(seq
, "\n");
7064 mddev_unlock(mddev
);
7069 static const struct seq_operations md_seq_ops
= {
7070 .start
= md_seq_start
,
7071 .next
= md_seq_next
,
7072 .stop
= md_seq_stop
,
7073 .show
= md_seq_show
,
7076 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7078 struct seq_file
*seq
;
7081 error
= seq_open(file
, &md_seq_ops
);
7085 seq
= file
->private_data
;
7086 seq
->poll_event
= atomic_read(&md_event_count
);
7090 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7092 struct seq_file
*seq
= filp
->private_data
;
7095 poll_wait(filp
, &md_event_waiters
, wait
);
7097 /* always allow read */
7098 mask
= POLLIN
| POLLRDNORM
;
7100 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7101 mask
|= POLLERR
| POLLPRI
;
7105 static const struct file_operations md_seq_fops
= {
7106 .owner
= THIS_MODULE
,
7107 .open
= md_seq_open
,
7109 .llseek
= seq_lseek
,
7110 .release
= seq_release_private
,
7111 .poll
= mdstat_poll
,
7114 int register_md_personality(struct md_personality
*p
)
7116 spin_lock(&pers_lock
);
7117 list_add_tail(&p
->list
, &pers_list
);
7118 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7119 spin_unlock(&pers_lock
);
7123 int unregister_md_personality(struct md_personality
*p
)
7125 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7126 spin_lock(&pers_lock
);
7127 list_del_init(&p
->list
);
7128 spin_unlock(&pers_lock
);
7132 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7134 struct md_rdev
* rdev
;
7140 rdev_for_each_rcu(rdev
, mddev
) {
7141 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7142 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7143 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7144 atomic_read(&disk
->sync_io
);
7145 /* sync IO will cause sync_io to increase before the disk_stats
7146 * as sync_io is counted when a request starts, and
7147 * disk_stats is counted when it completes.
7148 * So resync activity will cause curr_events to be smaller than
7149 * when there was no such activity.
7150 * non-sync IO will cause disk_stat to increase without
7151 * increasing sync_io so curr_events will (eventually)
7152 * be larger than it was before. Once it becomes
7153 * substantially larger, the test below will cause
7154 * the array to appear non-idle, and resync will slow
7156 * If there is a lot of outstanding resync activity when
7157 * we set last_event to curr_events, then all that activity
7158 * completing might cause the array to appear non-idle
7159 * and resync will be slowed down even though there might
7160 * not have been non-resync activity. This will only
7161 * happen once though. 'last_events' will soon reflect
7162 * the state where there is little or no outstanding
7163 * resync requests, and further resync activity will
7164 * always make curr_events less than last_events.
7167 if (init
|| curr_events
- rdev
->last_events
> 64) {
7168 rdev
->last_events
= curr_events
;
7176 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7178 /* another "blocks" (512byte) blocks have been synced */
7179 atomic_sub(blocks
, &mddev
->recovery_active
);
7180 wake_up(&mddev
->recovery_wait
);
7182 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7183 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7184 md_wakeup_thread(mddev
->thread
);
7185 // stop recovery, signal do_sync ....
7190 /* md_write_start(mddev, bi)
7191 * If we need to update some array metadata (e.g. 'active' flag
7192 * in superblock) before writing, schedule a superblock update
7193 * and wait for it to complete.
7195 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7198 if (bio_data_dir(bi
) != WRITE
)
7201 BUG_ON(mddev
->ro
== 1);
7202 if (mddev
->ro
== 2) {
7203 /* need to switch to read/write */
7205 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7206 md_wakeup_thread(mddev
->thread
);
7207 md_wakeup_thread(mddev
->sync_thread
);
7210 atomic_inc(&mddev
->writes_pending
);
7211 if (mddev
->safemode
== 1)
7212 mddev
->safemode
= 0;
7213 if (mddev
->in_sync
) {
7214 spin_lock_irq(&mddev
->write_lock
);
7215 if (mddev
->in_sync
) {
7217 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7218 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7219 md_wakeup_thread(mddev
->thread
);
7222 spin_unlock_irq(&mddev
->write_lock
);
7225 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7226 wait_event(mddev
->sb_wait
,
7227 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7230 void md_write_end(struct mddev
*mddev
)
7232 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7233 if (mddev
->safemode
== 2)
7234 md_wakeup_thread(mddev
->thread
);
7235 else if (mddev
->safemode_delay
)
7236 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7240 /* md_allow_write(mddev)
7241 * Calling this ensures that the array is marked 'active' so that writes
7242 * may proceed without blocking. It is important to call this before
7243 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7244 * Must be called with mddev_lock held.
7246 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7247 * is dropped, so return -EAGAIN after notifying userspace.
7249 int md_allow_write(struct mddev
*mddev
)
7255 if (!mddev
->pers
->sync_request
)
7258 spin_lock_irq(&mddev
->write_lock
);
7259 if (mddev
->in_sync
) {
7261 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7262 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7263 if (mddev
->safemode_delay
&&
7264 mddev
->safemode
== 0)
7265 mddev
->safemode
= 1;
7266 spin_unlock_irq(&mddev
->write_lock
);
7267 md_update_sb(mddev
, 0);
7268 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7270 spin_unlock_irq(&mddev
->write_lock
);
7272 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7277 EXPORT_SYMBOL_GPL(md_allow_write
);
7279 #define SYNC_MARKS 10
7280 #define SYNC_MARK_STEP (3*HZ)
7281 #define UPDATE_FREQUENCY (5*60*HZ)
7282 void md_do_sync(struct md_thread
*thread
)
7284 struct mddev
*mddev
= thread
->mddev
;
7285 struct mddev
*mddev2
;
7286 unsigned int currspeed
= 0,
7288 sector_t max_sectors
,j
, io_sectors
;
7289 unsigned long mark
[SYNC_MARKS
];
7290 unsigned long update_time
;
7291 sector_t mark_cnt
[SYNC_MARKS
];
7293 struct list_head
*tmp
;
7294 sector_t last_check
;
7296 struct md_rdev
*rdev
;
7298 struct blk_plug plug
;
7300 /* just incase thread restarts... */
7301 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7303 if (mddev
->ro
) /* never try to sync a read-only array */
7306 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7307 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
7308 desc
= "data-check";
7309 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7310 desc
= "requested-resync";
7313 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7318 /* we overload curr_resync somewhat here.
7319 * 0 == not engaged in resync at all
7320 * 2 == checking that there is no conflict with another sync
7321 * 1 == like 2, but have yielded to allow conflicting resync to
7323 * other == active in resync - this many blocks
7325 * Before starting a resync we must have set curr_resync to
7326 * 2, and then checked that every "conflicting" array has curr_resync
7327 * less than ours. When we find one that is the same or higher
7328 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7329 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7330 * This will mean we have to start checking from the beginning again.
7335 mddev
->curr_resync
= 2;
7338 if (kthread_should_stop())
7339 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7341 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7343 for_each_mddev(mddev2
, tmp
) {
7344 if (mddev2
== mddev
)
7346 if (!mddev
->parallel_resync
7347 && mddev2
->curr_resync
7348 && match_mddev_units(mddev
, mddev2
)) {
7350 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7351 /* arbitrarily yield */
7352 mddev
->curr_resync
= 1;
7353 wake_up(&resync_wait
);
7355 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7356 /* no need to wait here, we can wait the next
7357 * time 'round when curr_resync == 2
7360 /* We need to wait 'interruptible' so as not to
7361 * contribute to the load average, and not to
7362 * be caught by 'softlockup'
7364 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7365 if (!kthread_should_stop() &&
7366 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7367 printk(KERN_INFO
"md: delaying %s of %s"
7368 " until %s has finished (they"
7369 " share one or more physical units)\n",
7370 desc
, mdname(mddev
), mdname(mddev2
));
7372 if (signal_pending(current
))
7373 flush_signals(current
);
7375 finish_wait(&resync_wait
, &wq
);
7378 finish_wait(&resync_wait
, &wq
);
7381 } while (mddev
->curr_resync
< 2);
7384 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7385 /* resync follows the size requested by the personality,
7386 * which defaults to physical size, but can be virtual size
7388 max_sectors
= mddev
->resync_max_sectors
;
7389 atomic64_set(&mddev
->resync_mismatches
, 0);
7390 /* we don't use the checkpoint if there's a bitmap */
7391 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7392 j
= mddev
->resync_min
;
7393 else if (!mddev
->bitmap
)
7394 j
= mddev
->recovery_cp
;
7396 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7397 max_sectors
= mddev
->resync_max_sectors
;
7399 /* recovery follows the physical size of devices */
7400 max_sectors
= mddev
->dev_sectors
;
7403 rdev_for_each_rcu(rdev
, mddev
)
7404 if (rdev
->raid_disk
>= 0 &&
7405 !test_bit(Faulty
, &rdev
->flags
) &&
7406 !test_bit(In_sync
, &rdev
->flags
) &&
7407 rdev
->recovery_offset
< j
)
7408 j
= rdev
->recovery_offset
;
7412 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7413 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7414 " %d KB/sec/disk.\n", speed_min(mddev
));
7415 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7416 "(but not more than %d KB/sec) for %s.\n",
7417 speed_max(mddev
), desc
);
7419 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7422 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7424 mark_cnt
[m
] = io_sectors
;
7427 mddev
->resync_mark
= mark
[last_mark
];
7428 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7431 * Tune reconstruction:
7433 window
= 32*(PAGE_SIZE
/512);
7434 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7435 window
/2, (unsigned long long)max_sectors
/2);
7437 atomic_set(&mddev
->recovery_active
, 0);
7442 "md: resuming %s of %s from checkpoint.\n",
7443 desc
, mdname(mddev
));
7444 mddev
->curr_resync
= j
;
7446 mddev
->curr_resync
= 3; /* no longer delayed */
7447 mddev
->curr_resync_completed
= j
;
7448 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7449 md_new_event(mddev
);
7450 update_time
= jiffies
;
7452 blk_start_plug(&plug
);
7453 while (j
< max_sectors
) {
7458 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7459 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7460 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7461 > (max_sectors
>> 4)) ||
7462 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7463 (j
- mddev
->curr_resync_completed
)*2
7464 >= mddev
->resync_max
- mddev
->curr_resync_completed
7466 /* time to update curr_resync_completed */
7467 wait_event(mddev
->recovery_wait
,
7468 atomic_read(&mddev
->recovery_active
) == 0);
7469 mddev
->curr_resync_completed
= j
;
7470 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7471 j
> mddev
->recovery_cp
)
7472 mddev
->recovery_cp
= j
;
7473 update_time
= jiffies
;
7474 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7475 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7478 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
7479 /* As this condition is controlled by user-space,
7480 * we can block indefinitely, so use '_interruptible'
7481 * to avoid triggering warnings.
7483 flush_signals(current
); /* just in case */
7484 wait_event_interruptible(mddev
->recovery_wait
,
7485 mddev
->resync_max
> j
7486 || kthread_should_stop());
7489 if (kthread_should_stop())
7492 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7493 currspeed
< speed_min(mddev
));
7495 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7499 if (!skipped
) { /* actual IO requested */
7500 io_sectors
+= sectors
;
7501 atomic_add(sectors
, &mddev
->recovery_active
);
7504 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7509 mddev
->curr_resync
= j
;
7510 mddev
->curr_mark_cnt
= io_sectors
;
7511 if (last_check
== 0)
7512 /* this is the earliest that rebuild will be
7513 * visible in /proc/mdstat
7515 md_new_event(mddev
);
7517 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7520 last_check
= io_sectors
;
7522 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7524 int next
= (last_mark
+1) % SYNC_MARKS
;
7526 mddev
->resync_mark
= mark
[next
];
7527 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7528 mark
[next
] = jiffies
;
7529 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7534 if (kthread_should_stop())
7539 * this loop exits only if either when we are slower than
7540 * the 'hard' speed limit, or the system was IO-idle for
7542 * the system might be non-idle CPU-wise, but we only care
7543 * about not overloading the IO subsystem. (things like an
7544 * e2fsck being done on the RAID array should execute fast)
7548 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7549 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7551 if (currspeed
> speed_min(mddev
)) {
7552 if ((currspeed
> speed_max(mddev
)) ||
7553 !is_mddev_idle(mddev
, 0)) {
7559 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7561 * this also signals 'finished resyncing' to md_stop
7564 blk_finish_plug(&plug
);
7565 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7567 /* tell personality that we are finished */
7568 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7570 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7571 mddev
->curr_resync
> 2) {
7572 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7573 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7574 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7576 "md: checkpointing %s of %s.\n",
7577 desc
, mdname(mddev
));
7578 if (test_bit(MD_RECOVERY_ERROR
,
7580 mddev
->recovery_cp
=
7581 mddev
->curr_resync_completed
;
7583 mddev
->recovery_cp
=
7587 mddev
->recovery_cp
= MaxSector
;
7589 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7590 mddev
->curr_resync
= MaxSector
;
7592 rdev_for_each_rcu(rdev
, mddev
)
7593 if (rdev
->raid_disk
>= 0 &&
7594 mddev
->delta_disks
>= 0 &&
7595 !test_bit(Faulty
, &rdev
->flags
) &&
7596 !test_bit(In_sync
, &rdev
->flags
) &&
7597 rdev
->recovery_offset
< mddev
->curr_resync
)
7598 rdev
->recovery_offset
= mddev
->curr_resync
;
7603 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7605 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7606 /* We completed so min/max setting can be forgotten if used. */
7607 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7608 mddev
->resync_min
= 0;
7609 mddev
->resync_max
= MaxSector
;
7610 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7611 mddev
->resync_min
= mddev
->curr_resync_completed
;
7612 mddev
->curr_resync
= 0;
7613 wake_up(&resync_wait
);
7614 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7615 md_wakeup_thread(mddev
->thread
);
7620 * got a signal, exit.
7623 "md: md_do_sync() got signal ... exiting\n");
7624 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7628 EXPORT_SYMBOL_GPL(md_do_sync
);
7630 static int remove_and_add_spares(struct mddev
*mddev
)
7632 struct md_rdev
*rdev
;
7636 rdev_for_each(rdev
, mddev
)
7637 if (rdev
->raid_disk
>= 0 &&
7638 !test_bit(Blocked
, &rdev
->flags
) &&
7639 (test_bit(Faulty
, &rdev
->flags
) ||
7640 ! test_bit(In_sync
, &rdev
->flags
)) &&
7641 atomic_read(&rdev
->nr_pending
)==0) {
7642 if (mddev
->pers
->hot_remove_disk(
7643 mddev
, rdev
) == 0) {
7644 sysfs_unlink_rdev(mddev
, rdev
);
7645 rdev
->raid_disk
= -1;
7650 sysfs_notify(&mddev
->kobj
, NULL
,
7654 rdev_for_each(rdev
, mddev
) {
7655 if (rdev
->raid_disk
>= 0 &&
7656 !test_bit(In_sync
, &rdev
->flags
) &&
7657 !test_bit(Faulty
, &rdev
->flags
))
7659 if (rdev
->raid_disk
< 0
7660 && !test_bit(Faulty
, &rdev
->flags
)) {
7661 rdev
->recovery_offset
= 0;
7663 hot_add_disk(mddev
, rdev
) == 0) {
7664 if (sysfs_link_rdev(mddev
, rdev
))
7665 /* failure here is OK */;
7667 md_new_event(mddev
);
7668 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7673 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7677 static void reap_sync_thread(struct mddev
*mddev
)
7679 struct md_rdev
*rdev
;
7681 /* resync has finished, collect result */
7682 md_unregister_thread(&mddev
->sync_thread
);
7683 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7684 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7686 /* activate any spares */
7687 if (mddev
->pers
->spare_active(mddev
)) {
7688 sysfs_notify(&mddev
->kobj
, NULL
,
7690 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7693 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7694 mddev
->pers
->finish_reshape
)
7695 mddev
->pers
->finish_reshape(mddev
);
7697 /* If array is no-longer degraded, then any saved_raid_disk
7698 * information must be scrapped. Also if any device is now
7699 * In_sync we must scrape the saved_raid_disk for that device
7700 * do the superblock for an incrementally recovered device
7703 rdev_for_each(rdev
, mddev
)
7704 if (!mddev
->degraded
||
7705 test_bit(In_sync
, &rdev
->flags
))
7706 rdev
->saved_raid_disk
= -1;
7708 md_update_sb(mddev
, 1);
7709 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7710 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7711 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7712 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7713 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7714 /* flag recovery needed just to double check */
7715 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7716 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7717 md_new_event(mddev
);
7718 if (mddev
->event_work
.func
)
7719 queue_work(md_misc_wq
, &mddev
->event_work
);
7723 * This routine is regularly called by all per-raid-array threads to
7724 * deal with generic issues like resync and super-block update.
7725 * Raid personalities that don't have a thread (linear/raid0) do not
7726 * need this as they never do any recovery or update the superblock.
7728 * It does not do any resync itself, but rather "forks" off other threads
7729 * to do that as needed.
7730 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7731 * "->recovery" and create a thread at ->sync_thread.
7732 * When the thread finishes it sets MD_RECOVERY_DONE
7733 * and wakeups up this thread which will reap the thread and finish up.
7734 * This thread also removes any faulty devices (with nr_pending == 0).
7736 * The overall approach is:
7737 * 1/ if the superblock needs updating, update it.
7738 * 2/ If a recovery thread is running, don't do anything else.
7739 * 3/ If recovery has finished, clean up, possibly marking spares active.
7740 * 4/ If there are any faulty devices, remove them.
7741 * 5/ If array is degraded, try to add spares devices
7742 * 6/ If array has spares or is not in-sync, start a resync thread.
7744 void md_check_recovery(struct mddev
*mddev
)
7746 if (mddev
->suspended
)
7750 bitmap_daemon_work(mddev
);
7752 if (signal_pending(current
)) {
7753 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7754 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7756 mddev
->safemode
= 2;
7758 flush_signals(current
);
7761 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7764 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7765 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7766 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7767 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7768 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7769 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7773 if (mddev_trylock(mddev
)) {
7777 /* Only thing we do on a ro array is remove
7780 struct md_rdev
*rdev
;
7781 rdev_for_each(rdev
, mddev
)
7782 if (rdev
->raid_disk
>= 0 &&
7783 !test_bit(Blocked
, &rdev
->flags
) &&
7784 test_bit(Faulty
, &rdev
->flags
) &&
7785 atomic_read(&rdev
->nr_pending
)==0) {
7786 if (mddev
->pers
->hot_remove_disk(
7787 mddev
, rdev
) == 0) {
7788 sysfs_unlink_rdev(mddev
, rdev
);
7789 rdev
->raid_disk
= -1;
7792 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7796 if (!mddev
->external
) {
7798 spin_lock_irq(&mddev
->write_lock
);
7799 if (mddev
->safemode
&&
7800 !atomic_read(&mddev
->writes_pending
) &&
7802 mddev
->recovery_cp
== MaxSector
) {
7805 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7807 if (mddev
->safemode
== 1)
7808 mddev
->safemode
= 0;
7809 spin_unlock_irq(&mddev
->write_lock
);
7811 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7815 md_update_sb(mddev
, 0);
7817 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7818 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7819 /* resync/recovery still happening */
7820 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7823 if (mddev
->sync_thread
) {
7824 reap_sync_thread(mddev
);
7827 /* Set RUNNING before clearing NEEDED to avoid
7828 * any transients in the value of "sync_action".
7830 mddev
->curr_resync_completed
= 0;
7831 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7832 /* Clear some bits that don't mean anything, but
7835 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7836 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7838 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7839 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7841 /* no recovery is running.
7842 * remove any failed drives, then
7843 * add spares if possible.
7844 * Spares are also removed and re-added, to allow
7845 * the personality to fail the re-add.
7848 if (mddev
->reshape_position
!= MaxSector
) {
7849 if (mddev
->pers
->check_reshape
== NULL
||
7850 mddev
->pers
->check_reshape(mddev
) != 0)
7851 /* Cannot proceed */
7853 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7854 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7855 } else if ((spares
= remove_and_add_spares(mddev
))) {
7856 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7857 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7858 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7859 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7860 } else if (mddev
->recovery_cp
< MaxSector
) {
7861 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7862 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7863 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7864 /* nothing to be done ... */
7867 if (mddev
->pers
->sync_request
) {
7869 /* We are adding a device or devices to an array
7870 * which has the bitmap stored on all devices.
7871 * So make sure all bitmap pages get written
7873 bitmap_write_all(mddev
->bitmap
);
7875 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7878 if (!mddev
->sync_thread
) {
7879 printk(KERN_ERR
"%s: could not start resync"
7882 /* leave the spares where they are, it shouldn't hurt */
7883 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7884 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7885 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7886 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7887 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7889 md_wakeup_thread(mddev
->sync_thread
);
7890 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7891 md_new_event(mddev
);
7894 if (!mddev
->sync_thread
) {
7895 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7896 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7898 if (mddev
->sysfs_action
)
7899 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7901 mddev_unlock(mddev
);
7905 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7907 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7908 wait_event_timeout(rdev
->blocked_wait
,
7909 !test_bit(Blocked
, &rdev
->flags
) &&
7910 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7911 msecs_to_jiffies(5000));
7912 rdev_dec_pending(rdev
, mddev
);
7914 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7916 void md_finish_reshape(struct mddev
*mddev
)
7918 /* called be personality module when reshape completes. */
7919 struct md_rdev
*rdev
;
7921 rdev_for_each(rdev
, mddev
) {
7922 if (rdev
->data_offset
> rdev
->new_data_offset
)
7923 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7925 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7926 rdev
->data_offset
= rdev
->new_data_offset
;
7929 EXPORT_SYMBOL(md_finish_reshape
);
7931 /* Bad block management.
7932 * We can record which blocks on each device are 'bad' and so just
7933 * fail those blocks, or that stripe, rather than the whole device.
7934 * Entries in the bad-block table are 64bits wide. This comprises:
7935 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7936 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7937 * A 'shift' can be set so that larger blocks are tracked and
7938 * consequently larger devices can be covered.
7939 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7941 * Locking of the bad-block table uses a seqlock so md_is_badblock
7942 * might need to retry if it is very unlucky.
7943 * We will sometimes want to check for bad blocks in a bi_end_io function,
7944 * so we use the write_seqlock_irq variant.
7946 * When looking for a bad block we specify a range and want to
7947 * know if any block in the range is bad. So we binary-search
7948 * to the last range that starts at-or-before the given endpoint,
7949 * (or "before the sector after the target range")
7950 * then see if it ends after the given start.
7952 * 0 if there are no known bad blocks in the range
7953 * 1 if there are known bad block which are all acknowledged
7954 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7955 * plus the start/length of the first bad section we overlap.
7957 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7958 sector_t
*first_bad
, int *bad_sectors
)
7964 sector_t target
= s
+ sectors
;
7967 if (bb
->shift
> 0) {
7968 /* round the start down, and the end up */
7970 target
+= (1<<bb
->shift
) - 1;
7971 target
>>= bb
->shift
;
7972 sectors
= target
- s
;
7974 /* 'target' is now the first block after the bad range */
7977 seq
= read_seqbegin(&bb
->lock
);
7982 /* Binary search between lo and hi for 'target'
7983 * i.e. for the last range that starts before 'target'
7985 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7986 * are known not to be the last range before target.
7987 * VARIANT: hi-lo is the number of possible
7988 * ranges, and decreases until it reaches 1
7990 while (hi
- lo
> 1) {
7991 int mid
= (lo
+ hi
) / 2;
7992 sector_t a
= BB_OFFSET(p
[mid
]);
7994 /* This could still be the one, earlier ranges
7998 /* This and later ranges are definitely out. */
8001 /* 'lo' might be the last that started before target, but 'hi' isn't */
8003 /* need to check all range that end after 's' to see if
8004 * any are unacknowledged.
8007 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8008 if (BB_OFFSET(p
[lo
]) < target
) {
8009 /* starts before the end, and finishes after
8010 * the start, so they must overlap
8012 if (rv
!= -1 && BB_ACK(p
[lo
]))
8016 *first_bad
= BB_OFFSET(p
[lo
]);
8017 *bad_sectors
= BB_LEN(p
[lo
]);
8023 if (read_seqretry(&bb
->lock
, seq
))
8028 EXPORT_SYMBOL_GPL(md_is_badblock
);
8031 * Add a range of bad blocks to the table.
8032 * This might extend the table, or might contract it
8033 * if two adjacent ranges can be merged.
8034 * We binary-search to find the 'insertion' point, then
8035 * decide how best to handle it.
8037 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8045 /* badblocks are disabled */
8049 /* round the start down, and the end up */
8050 sector_t next
= s
+ sectors
;
8052 next
+= (1<<bb
->shift
) - 1;
8057 write_seqlock_irq(&bb
->lock
);
8062 /* Find the last range that starts at-or-before 's' */
8063 while (hi
- lo
> 1) {
8064 int mid
= (lo
+ hi
) / 2;
8065 sector_t a
= BB_OFFSET(p
[mid
]);
8071 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8075 /* we found a range that might merge with the start
8078 sector_t a
= BB_OFFSET(p
[lo
]);
8079 sector_t e
= a
+ BB_LEN(p
[lo
]);
8080 int ack
= BB_ACK(p
[lo
]);
8082 /* Yes, we can merge with a previous range */
8083 if (s
== a
&& s
+ sectors
>= e
)
8084 /* new range covers old */
8087 ack
= ack
&& acknowledged
;
8089 if (e
< s
+ sectors
)
8091 if (e
- a
<= BB_MAX_LEN
) {
8092 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8095 /* does not all fit in one range,
8096 * make p[lo] maximal
8098 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8099 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8105 if (sectors
&& hi
< bb
->count
) {
8106 /* 'hi' points to the first range that starts after 's'.
8107 * Maybe we can merge with the start of that range */
8108 sector_t a
= BB_OFFSET(p
[hi
]);
8109 sector_t e
= a
+ BB_LEN(p
[hi
]);
8110 int ack
= BB_ACK(p
[hi
]);
8111 if (a
<= s
+ sectors
) {
8112 /* merging is possible */
8113 if (e
<= s
+ sectors
) {
8118 ack
= ack
&& acknowledged
;
8121 if (e
- a
<= BB_MAX_LEN
) {
8122 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8125 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8133 if (sectors
== 0 && hi
< bb
->count
) {
8134 /* we might be able to combine lo and hi */
8135 /* Note: 's' is at the end of 'lo' */
8136 sector_t a
= BB_OFFSET(p
[hi
]);
8137 int lolen
= BB_LEN(p
[lo
]);
8138 int hilen
= BB_LEN(p
[hi
]);
8139 int newlen
= lolen
+ hilen
- (s
- a
);
8140 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8141 /* yes, we can combine them */
8142 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8143 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8144 memmove(p
+ hi
, p
+ hi
+ 1,
8145 (bb
->count
- hi
- 1) * 8);
8150 /* didn't merge (it all).
8151 * Need to add a range just before 'hi' */
8152 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8153 /* No room for more */
8157 int this_sectors
= sectors
;
8158 memmove(p
+ hi
+ 1, p
+ hi
,
8159 (bb
->count
- hi
) * 8);
8162 if (this_sectors
> BB_MAX_LEN
)
8163 this_sectors
= BB_MAX_LEN
;
8164 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8165 sectors
-= this_sectors
;
8172 bb
->unacked_exist
= 1;
8173 write_sequnlock_irq(&bb
->lock
);
8178 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8183 s
+= rdev
->new_data_offset
;
8185 s
+= rdev
->data_offset
;
8186 rv
= md_set_badblocks(&rdev
->badblocks
,
8189 /* Make sure they get written out promptly */
8190 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8191 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8192 md_wakeup_thread(rdev
->mddev
->thread
);
8196 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8199 * Remove a range of bad blocks from the table.
8200 * This may involve extending the table if we spilt a region,
8201 * but it must not fail. So if the table becomes full, we just
8202 * drop the remove request.
8204 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8208 sector_t target
= s
+ sectors
;
8211 if (bb
->shift
> 0) {
8212 /* When clearing we round the start up and the end down.
8213 * This should not matter as the shift should align with
8214 * the block size and no rounding should ever be needed.
8215 * However it is better the think a block is bad when it
8216 * isn't than to think a block is not bad when it is.
8218 s
+= (1<<bb
->shift
) - 1;
8220 target
>>= bb
->shift
;
8221 sectors
= target
- s
;
8224 write_seqlock_irq(&bb
->lock
);
8229 /* Find the last range that starts before 'target' */
8230 while (hi
- lo
> 1) {
8231 int mid
= (lo
+ hi
) / 2;
8232 sector_t a
= BB_OFFSET(p
[mid
]);
8239 /* p[lo] is the last range that could overlap the
8240 * current range. Earlier ranges could also overlap,
8241 * but only this one can overlap the end of the range.
8243 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8244 /* Partial overlap, leave the tail of this range */
8245 int ack
= BB_ACK(p
[lo
]);
8246 sector_t a
= BB_OFFSET(p
[lo
]);
8247 sector_t end
= a
+ BB_LEN(p
[lo
]);
8250 /* we need to split this range */
8251 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8255 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8257 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8260 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8261 /* there is no longer an overlap */
8266 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8267 /* This range does overlap */
8268 if (BB_OFFSET(p
[lo
]) < s
) {
8269 /* Keep the early parts of this range. */
8270 int ack
= BB_ACK(p
[lo
]);
8271 sector_t start
= BB_OFFSET(p
[lo
]);
8272 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8273 /* now low doesn't overlap, so.. */
8278 /* 'lo' is strictly before, 'hi' is strictly after,
8279 * anything between needs to be discarded
8282 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8283 bb
->count
-= (hi
- lo
- 1);
8289 write_sequnlock_irq(&bb
->lock
);
8293 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8297 s
+= rdev
->new_data_offset
;
8299 s
+= rdev
->data_offset
;
8300 return md_clear_badblocks(&rdev
->badblocks
,
8303 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8306 * Acknowledge all bad blocks in a list.
8307 * This only succeeds if ->changed is clear. It is used by
8308 * in-kernel metadata updates
8310 void md_ack_all_badblocks(struct badblocks
*bb
)
8312 if (bb
->page
== NULL
|| bb
->changed
)
8313 /* no point even trying */
8315 write_seqlock_irq(&bb
->lock
);
8317 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8320 for (i
= 0; i
< bb
->count
; i
++) {
8321 if (!BB_ACK(p
[i
])) {
8322 sector_t start
= BB_OFFSET(p
[i
]);
8323 int len
= BB_LEN(p
[i
]);
8324 p
[i
] = BB_MAKE(start
, len
, 1);
8327 bb
->unacked_exist
= 0;
8329 write_sequnlock_irq(&bb
->lock
);
8331 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8333 /* sysfs access to bad-blocks list.
8334 * We present two files.
8335 * 'bad-blocks' lists sector numbers and lengths of ranges that
8336 * are recorded as bad. The list is truncated to fit within
8337 * the one-page limit of sysfs.
8338 * Writing "sector length" to this file adds an acknowledged
8340 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8341 * been acknowledged. Writing to this file adds bad blocks
8342 * without acknowledging them. This is largely for testing.
8346 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8357 seq
= read_seqbegin(&bb
->lock
);
8362 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8363 sector_t s
= BB_OFFSET(p
[i
]);
8364 unsigned int length
= BB_LEN(p
[i
]);
8365 int ack
= BB_ACK(p
[i
]);
8371 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8372 (unsigned long long)s
<< bb
->shift
,
8373 length
<< bb
->shift
);
8375 if (unack
&& len
== 0)
8376 bb
->unacked_exist
= 0;
8378 if (read_seqretry(&bb
->lock
, seq
))
8387 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8389 unsigned long long sector
;
8393 /* Allow clearing via sysfs *only* for testing/debugging.
8394 * Normally only a successful write may clear a badblock
8397 if (page
[0] == '-') {
8401 #endif /* DO_DEBUG */
8403 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8405 if (newline
!= '\n')
8417 md_clear_badblocks(bb
, sector
, length
);
8420 #endif /* DO_DEBUG */
8421 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8427 static int md_notify_reboot(struct notifier_block
*this,
8428 unsigned long code
, void *x
)
8430 struct list_head
*tmp
;
8431 struct mddev
*mddev
;
8434 for_each_mddev(mddev
, tmp
) {
8435 if (mddev_trylock(mddev
)) {
8437 __md_stop_writes(mddev
);
8438 mddev
->safemode
= 2;
8439 mddev_unlock(mddev
);
8444 * certain more exotic SCSI devices are known to be
8445 * volatile wrt too early system reboots. While the
8446 * right place to handle this issue is the given
8447 * driver, we do want to have a safe RAID driver ...
8455 static struct notifier_block md_notifier
= {
8456 .notifier_call
= md_notify_reboot
,
8458 .priority
= INT_MAX
, /* before any real devices */
8461 static void md_geninit(void)
8463 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8465 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8468 static int __init
md_init(void)
8472 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8476 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8480 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8483 if ((ret
= register_blkdev(0, "mdp")) < 0)
8487 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8488 md_probe
, NULL
, NULL
);
8489 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8490 md_probe
, NULL
, NULL
);
8492 register_reboot_notifier(&md_notifier
);
8493 raid_table_header
= register_sysctl_table(raid_root_table
);
8499 unregister_blkdev(MD_MAJOR
, "md");
8501 destroy_workqueue(md_misc_wq
);
8503 destroy_workqueue(md_wq
);
8511 * Searches all registered partitions for autorun RAID arrays
8515 static LIST_HEAD(all_detected_devices
);
8516 struct detected_devices_node
{
8517 struct list_head list
;
8521 void md_autodetect_dev(dev_t dev
)
8523 struct detected_devices_node
*node_detected_dev
;
8525 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8526 if (node_detected_dev
) {
8527 node_detected_dev
->dev
= dev
;
8528 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8530 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8531 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8536 static void autostart_arrays(int part
)
8538 struct md_rdev
*rdev
;
8539 struct detected_devices_node
*node_detected_dev
;
8541 int i_scanned
, i_passed
;
8546 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8548 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8550 node_detected_dev
= list_entry(all_detected_devices
.next
,
8551 struct detected_devices_node
, list
);
8552 list_del(&node_detected_dev
->list
);
8553 dev
= node_detected_dev
->dev
;
8554 kfree(node_detected_dev
);
8555 rdev
= md_import_device(dev
,0, 90);
8559 if (test_bit(Faulty
, &rdev
->flags
)) {
8563 set_bit(AutoDetected
, &rdev
->flags
);
8564 list_add(&rdev
->same_set
, &pending_raid_disks
);
8568 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8569 i_scanned
, i_passed
);
8571 autorun_devices(part
);
8574 #endif /* !MODULE */
8576 static __exit
void md_exit(void)
8578 struct mddev
*mddev
;
8579 struct list_head
*tmp
;
8581 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8582 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8584 unregister_blkdev(MD_MAJOR
,"md");
8585 unregister_blkdev(mdp_major
, "mdp");
8586 unregister_reboot_notifier(&md_notifier
);
8587 unregister_sysctl_table(raid_table_header
);
8588 remove_proc_entry("mdstat", NULL
);
8589 for_each_mddev(mddev
, tmp
) {
8590 export_array(mddev
);
8591 mddev
->hold_active
= 0;
8593 destroy_workqueue(md_misc_wq
);
8594 destroy_workqueue(md_wq
);
8597 subsys_initcall(md_init
);
8598 module_exit(md_exit
)
8600 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8602 return sprintf(buffer
, "%d", start_readonly
);
8604 static int set_ro(const char *val
, struct kernel_param
*kp
)
8607 int num
= simple_strtoul(val
, &e
, 10);
8608 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8609 start_readonly
= num
;
8615 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8616 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8618 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8620 EXPORT_SYMBOL(register_md_personality
);
8621 EXPORT_SYMBOL(unregister_md_personality
);
8622 EXPORT_SYMBOL(md_error
);
8623 EXPORT_SYMBOL(md_done_sync
);
8624 EXPORT_SYMBOL(md_write_start
);
8625 EXPORT_SYMBOL(md_write_end
);
8626 EXPORT_SYMBOL(md_register_thread
);
8627 EXPORT_SYMBOL(md_unregister_thread
);
8628 EXPORT_SYMBOL(md_wakeup_thread
);
8629 EXPORT_SYMBOL(md_check_recovery
);
8630 MODULE_LICENSE("GPL");
8631 MODULE_DESCRIPTION("MD RAID framework");
8633 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);