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>
39 #include <linux/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/module.h>
48 #include <linux/reboot.h>
49 #include <linux/file.h>
50 #include <linux/compat.h>
51 #include <linux/delay.h>
52 #include <linux/raid/md_p.h>
53 #include <linux/raid/md_u.h>
54 #include <linux/slab.h>
59 static void autostart_arrays(int part
);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list
);
68 static DEFINE_SPINLOCK(pers_lock
);
70 static void md_print_devices(void);
72 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
73 static struct workqueue_struct
*md_wq
;
74 static struct workqueue_struct
*md_misc_wq
;
76 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
79 * Default number of read corrections we'll attempt on an rdev
80 * before ejecting it from the array. We divide the read error
81 * count by 2 for every hour elapsed between read errors.
83 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
85 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
86 * is 1000 KB/sec, so the extra system load does not show up that much.
87 * Increase it if you want to have more _guaranteed_ speed. Note that
88 * the RAID driver will use the maximum available bandwidth if the IO
89 * subsystem is idle. There is also an 'absolute maximum' reconstruction
90 * speed limit - in case reconstruction slows down your system despite
93 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
94 * or /sys/block/mdX/md/sync_speed_{min,max}
97 static int sysctl_speed_limit_min
= 1000;
98 static int sysctl_speed_limit_max
= 200000;
99 static inline int speed_min(struct mddev
*mddev
)
101 return mddev
->sync_speed_min
?
102 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
105 static inline int speed_max(struct mddev
*mddev
)
107 return mddev
->sync_speed_max
?
108 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
111 static struct ctl_table_header
*raid_table_header
;
113 static ctl_table raid_table
[] = {
115 .procname
= "speed_limit_min",
116 .data
= &sysctl_speed_limit_min
,
117 .maxlen
= sizeof(int),
118 .mode
= S_IRUGO
|S_IWUSR
,
119 .proc_handler
= proc_dointvec
,
122 .procname
= "speed_limit_max",
123 .data
= &sysctl_speed_limit_max
,
124 .maxlen
= sizeof(int),
125 .mode
= S_IRUGO
|S_IWUSR
,
126 .proc_handler
= proc_dointvec
,
131 static ctl_table raid_dir_table
[] = {
135 .mode
= S_IRUGO
|S_IXUGO
,
141 static ctl_table raid_root_table
[] = {
146 .child
= raid_dir_table
,
151 static const struct block_device_operations md_fops
;
153 static int start_readonly
;
156 * like bio_clone, but with a local bio set
159 static void mddev_bio_destructor(struct bio
*bio
)
161 struct mddev
*mddev
, **mddevp
;
166 bio_free(bio
, mddev
->bio_set
);
169 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
173 struct mddev
**mddevp
;
175 if (!mddev
|| !mddev
->bio_set
)
176 return bio_alloc(gfp_mask
, nr_iovecs
);
178 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
,
184 b
->bi_destructor
= mddev_bio_destructor
;
187 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
189 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
193 struct mddev
**mddevp
;
195 if (!mddev
|| !mddev
->bio_set
)
196 return bio_clone(bio
, gfp_mask
);
198 b
= bio_alloc_bioset(gfp_mask
, bio
->bi_max_vecs
,
204 b
->bi_destructor
= mddev_bio_destructor
;
206 if (bio_integrity(bio
)) {
209 ret
= bio_integrity_clone(b
, bio
, gfp_mask
, mddev
->bio_set
);
219 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
221 void md_trim_bio(struct bio
*bio
, int offset
, int size
)
223 /* 'bio' is a cloned bio which we need to trim to match
224 * the given offset and size.
225 * This requires adjusting bi_sector, bi_size, and bi_io_vec
228 struct bio_vec
*bvec
;
232 if (offset
== 0 && size
== bio
->bi_size
)
235 bio
->bi_sector
+= offset
;
238 clear_bit(BIO_SEG_VALID
, &bio
->bi_flags
);
240 while (bio
->bi_idx
< bio
->bi_vcnt
&&
241 bio
->bi_io_vec
[bio
->bi_idx
].bv_len
<= offset
) {
242 /* remove this whole bio_vec */
243 offset
-= bio
->bi_io_vec
[bio
->bi_idx
].bv_len
;
246 if (bio
->bi_idx
< bio
->bi_vcnt
) {
247 bio
->bi_io_vec
[bio
->bi_idx
].bv_offset
+= offset
;
248 bio
->bi_io_vec
[bio
->bi_idx
].bv_len
-= offset
;
250 /* avoid any complications with bi_idx being non-zero*/
252 memmove(bio
->bi_io_vec
, bio
->bi_io_vec
+bio
->bi_idx
,
253 (bio
->bi_vcnt
- bio
->bi_idx
) * sizeof(struct bio_vec
));
254 bio
->bi_vcnt
-= bio
->bi_idx
;
257 /* Make sure vcnt and last bv are not too big */
258 bio_for_each_segment(bvec
, bio
, i
) {
259 if (sofar
+ bvec
->bv_len
> size
)
260 bvec
->bv_len
= size
- sofar
;
261 if (bvec
->bv_len
== 0) {
265 sofar
+= bvec
->bv_len
;
268 EXPORT_SYMBOL_GPL(md_trim_bio
);
271 * We have a system wide 'event count' that is incremented
272 * on any 'interesting' event, and readers of /proc/mdstat
273 * can use 'poll' or 'select' to find out when the event
277 * start array, stop array, error, add device, remove device,
278 * start build, activate spare
280 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
281 static atomic_t md_event_count
;
282 void md_new_event(struct mddev
*mddev
)
284 atomic_inc(&md_event_count
);
285 wake_up(&md_event_waiters
);
287 EXPORT_SYMBOL_GPL(md_new_event
);
289 /* Alternate version that can be called from interrupts
290 * when calling sysfs_notify isn't needed.
292 static void md_new_event_inintr(struct mddev
*mddev
)
294 atomic_inc(&md_event_count
);
295 wake_up(&md_event_waiters
);
299 * Enables to iterate over all existing md arrays
300 * all_mddevs_lock protects this list.
302 static LIST_HEAD(all_mddevs
);
303 static DEFINE_SPINLOCK(all_mddevs_lock
);
307 * iterates through all used mddevs in the system.
308 * We take care to grab the all_mddevs_lock whenever navigating
309 * the list, and to always hold a refcount when unlocked.
310 * Any code which breaks out of this loop while own
311 * a reference to the current mddev and must mddev_put it.
313 #define for_each_mddev(_mddev,_tmp) \
315 for (({ spin_lock(&all_mddevs_lock); \
316 _tmp = all_mddevs.next; \
318 ({ if (_tmp != &all_mddevs) \
319 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
320 spin_unlock(&all_mddevs_lock); \
321 if (_mddev) mddev_put(_mddev); \
322 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
323 _tmp != &all_mddevs;}); \
324 ({ spin_lock(&all_mddevs_lock); \
325 _tmp = _tmp->next;}) \
329 /* Rather than calling directly into the personality make_request function,
330 * IO requests come here first so that we can check if the device is
331 * being suspended pending a reconfiguration.
332 * We hold a refcount over the call to ->make_request. By the time that
333 * call has finished, the bio has been linked into some internal structure
334 * and so is visible to ->quiesce(), so we don't need the refcount any more.
336 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
338 const int rw
= bio_data_dir(bio
);
339 struct mddev
*mddev
= q
->queuedata
;
342 unsigned int sectors
;
344 if (mddev
== NULL
|| mddev
->pers
== NULL
349 smp_rmb(); /* Ensure implications of 'active' are visible */
351 if (mddev
->suspended
) {
354 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
355 TASK_UNINTERRUPTIBLE
);
356 if (!mddev
->suspended
)
362 finish_wait(&mddev
->sb_wait
, &__wait
);
364 atomic_inc(&mddev
->active_io
);
368 * save the sectors now since our bio can
369 * go away inside make_request
371 sectors
= bio_sectors(bio
);
372 rv
= mddev
->pers
->make_request(mddev
, bio
);
374 cpu
= part_stat_lock();
375 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
376 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
379 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
380 wake_up(&mddev
->sb_wait
);
385 /* mddev_suspend makes sure no new requests are submitted
386 * to the device, and that any requests that have been submitted
387 * are completely handled.
388 * Once ->stop is called and completes, the module will be completely
391 void mddev_suspend(struct mddev
*mddev
)
393 BUG_ON(mddev
->suspended
);
394 mddev
->suspended
= 1;
396 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
397 mddev
->pers
->quiesce(mddev
, 1);
399 EXPORT_SYMBOL_GPL(mddev_suspend
);
401 void mddev_resume(struct mddev
*mddev
)
403 mddev
->suspended
= 0;
404 wake_up(&mddev
->sb_wait
);
405 mddev
->pers
->quiesce(mddev
, 0);
407 md_wakeup_thread(mddev
->thread
);
408 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
410 EXPORT_SYMBOL_GPL(mddev_resume
);
412 int mddev_congested(struct mddev
*mddev
, int bits
)
414 return mddev
->suspended
;
416 EXPORT_SYMBOL(mddev_congested
);
419 * Generic flush handling for md
422 static void md_end_flush(struct bio
*bio
, int err
)
424 struct md_rdev
*rdev
= bio
->bi_private
;
425 struct mddev
*mddev
= rdev
->mddev
;
427 rdev_dec_pending(rdev
, mddev
);
429 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
430 /* The pre-request flush has finished */
431 queue_work(md_wq
, &mddev
->flush_work
);
436 static void md_submit_flush_data(struct work_struct
*ws
);
438 static void submit_flushes(struct work_struct
*ws
)
440 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
441 struct md_rdev
*rdev
;
443 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
444 atomic_set(&mddev
->flush_pending
, 1);
446 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
447 if (rdev
->raid_disk
>= 0 &&
448 !test_bit(Faulty
, &rdev
->flags
)) {
449 /* Take two references, one is dropped
450 * when request finishes, one after
451 * we reclaim rcu_read_lock
454 atomic_inc(&rdev
->nr_pending
);
455 atomic_inc(&rdev
->nr_pending
);
457 bi
= bio_alloc_mddev(GFP_KERNEL
, 0, mddev
);
458 bi
->bi_end_io
= md_end_flush
;
459 bi
->bi_private
= rdev
;
460 bi
->bi_bdev
= rdev
->bdev
;
461 atomic_inc(&mddev
->flush_pending
);
462 submit_bio(WRITE_FLUSH
, bi
);
464 rdev_dec_pending(rdev
, mddev
);
467 if (atomic_dec_and_test(&mddev
->flush_pending
))
468 queue_work(md_wq
, &mddev
->flush_work
);
471 static void md_submit_flush_data(struct work_struct
*ws
)
473 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
474 struct bio
*bio
= mddev
->flush_bio
;
476 if (bio
->bi_size
== 0)
477 /* an empty barrier - all done */
480 bio
->bi_rw
&= ~REQ_FLUSH
;
481 if (mddev
->pers
->make_request(mddev
, bio
))
482 generic_make_request(bio
);
485 mddev
->flush_bio
= NULL
;
486 wake_up(&mddev
->sb_wait
);
489 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
491 spin_lock_irq(&mddev
->write_lock
);
492 wait_event_lock_irq(mddev
->sb_wait
,
494 mddev
->write_lock
, /*nothing*/);
495 mddev
->flush_bio
= bio
;
496 spin_unlock_irq(&mddev
->write_lock
);
498 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
499 queue_work(md_wq
, &mddev
->flush_work
);
501 EXPORT_SYMBOL(md_flush_request
);
503 /* Support for plugging.
504 * This mirrors the plugging support in request_queue, but does not
505 * require having a whole queue or request structures.
506 * We allocate an md_plug_cb for each md device and each thread it gets
507 * plugged on. This links tot the private plug_handle structure in the
508 * personality data where we keep a count of the number of outstanding
509 * plugs so other code can see if a plug is active.
512 struct blk_plug_cb cb
;
516 static void plugger_unplug(struct blk_plug_cb
*cb
)
518 struct md_plug_cb
*mdcb
= container_of(cb
, struct md_plug_cb
, cb
);
519 if (atomic_dec_and_test(&mdcb
->mddev
->plug_cnt
))
520 md_wakeup_thread(mdcb
->mddev
->thread
);
524 /* Check that an unplug wakeup will come shortly.
525 * If not, wakeup the md thread immediately
527 int mddev_check_plugged(struct mddev
*mddev
)
529 struct blk_plug
*plug
= current
->plug
;
530 struct md_plug_cb
*mdcb
;
535 list_for_each_entry(mdcb
, &plug
->cb_list
, cb
.list
) {
536 if (mdcb
->cb
.callback
== plugger_unplug
&&
537 mdcb
->mddev
== mddev
) {
538 /* Already on the list, move to top */
539 if (mdcb
!= list_first_entry(&plug
->cb_list
,
542 list_move(&mdcb
->cb
.list
, &plug
->cb_list
);
546 /* Not currently on the callback list */
547 mdcb
= kmalloc(sizeof(*mdcb
), GFP_ATOMIC
);
552 mdcb
->cb
.callback
= plugger_unplug
;
553 atomic_inc(&mddev
->plug_cnt
);
554 list_add(&mdcb
->cb
.list
, &plug
->cb_list
);
557 EXPORT_SYMBOL_GPL(mddev_check_plugged
);
559 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
561 atomic_inc(&mddev
->active
);
565 static void mddev_delayed_delete(struct work_struct
*ws
);
567 static void mddev_put(struct mddev
*mddev
)
569 struct bio_set
*bs
= NULL
;
571 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
573 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
574 mddev
->ctime
== 0 && !mddev
->hold_active
) {
575 /* Array is not configured at all, and not held active,
577 list_del(&mddev
->all_mddevs
);
579 mddev
->bio_set
= NULL
;
580 if (mddev
->gendisk
) {
581 /* We did a probe so need to clean up. Call
582 * queue_work inside the spinlock so that
583 * flush_workqueue() after mddev_find will
584 * succeed in waiting for the work to be done.
586 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
587 queue_work(md_misc_wq
, &mddev
->del_work
);
591 spin_unlock(&all_mddevs_lock
);
596 void mddev_init(struct mddev
*mddev
)
598 mutex_init(&mddev
->open_mutex
);
599 mutex_init(&mddev
->reconfig_mutex
);
600 mutex_init(&mddev
->bitmap_info
.mutex
);
601 INIT_LIST_HEAD(&mddev
->disks
);
602 INIT_LIST_HEAD(&mddev
->all_mddevs
);
603 init_timer(&mddev
->safemode_timer
);
604 atomic_set(&mddev
->active
, 1);
605 atomic_set(&mddev
->openers
, 0);
606 atomic_set(&mddev
->active_io
, 0);
607 atomic_set(&mddev
->plug_cnt
, 0);
608 spin_lock_init(&mddev
->write_lock
);
609 atomic_set(&mddev
->flush_pending
, 0);
610 init_waitqueue_head(&mddev
->sb_wait
);
611 init_waitqueue_head(&mddev
->recovery_wait
);
612 mddev
->reshape_position
= MaxSector
;
613 mddev
->resync_min
= 0;
614 mddev
->resync_max
= MaxSector
;
615 mddev
->level
= LEVEL_NONE
;
617 EXPORT_SYMBOL_GPL(mddev_init
);
619 static struct mddev
* mddev_find(dev_t unit
)
621 struct mddev
*mddev
, *new = NULL
;
623 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
624 unit
&= ~((1<<MdpMinorShift
)-1);
627 spin_lock(&all_mddevs_lock
);
630 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
631 if (mddev
->unit
== unit
) {
633 spin_unlock(&all_mddevs_lock
);
639 list_add(&new->all_mddevs
, &all_mddevs
);
640 spin_unlock(&all_mddevs_lock
);
641 new->hold_active
= UNTIL_IOCTL
;
645 /* find an unused unit number */
646 static int next_minor
= 512;
647 int start
= next_minor
;
651 dev
= MKDEV(MD_MAJOR
, next_minor
);
653 if (next_minor
> MINORMASK
)
655 if (next_minor
== start
) {
656 /* Oh dear, all in use. */
657 spin_unlock(&all_mddevs_lock
);
663 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
664 if (mddev
->unit
== dev
) {
670 new->md_minor
= MINOR(dev
);
671 new->hold_active
= UNTIL_STOP
;
672 list_add(&new->all_mddevs
, &all_mddevs
);
673 spin_unlock(&all_mddevs_lock
);
676 spin_unlock(&all_mddevs_lock
);
678 new = kzalloc(sizeof(*new), GFP_KERNEL
);
683 if (MAJOR(unit
) == MD_MAJOR
)
684 new->md_minor
= MINOR(unit
);
686 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
693 static inline int mddev_lock(struct mddev
* mddev
)
695 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
698 static inline int mddev_is_locked(struct mddev
*mddev
)
700 return mutex_is_locked(&mddev
->reconfig_mutex
);
703 static inline int mddev_trylock(struct mddev
* mddev
)
705 return mutex_trylock(&mddev
->reconfig_mutex
);
708 static struct attribute_group md_redundancy_group
;
710 static void mddev_unlock(struct mddev
* mddev
)
712 if (mddev
->to_remove
) {
713 /* These cannot be removed under reconfig_mutex as
714 * an access to the files will try to take reconfig_mutex
715 * while holding the file unremovable, which leads to
717 * So hold set sysfs_active while the remove in happeing,
718 * and anything else which might set ->to_remove or my
719 * otherwise change the sysfs namespace will fail with
720 * -EBUSY if sysfs_active is still set.
721 * We set sysfs_active under reconfig_mutex and elsewhere
722 * test it under the same mutex to ensure its correct value
725 struct attribute_group
*to_remove
= mddev
->to_remove
;
726 mddev
->to_remove
= NULL
;
727 mddev
->sysfs_active
= 1;
728 mutex_unlock(&mddev
->reconfig_mutex
);
730 if (mddev
->kobj
.sd
) {
731 if (to_remove
!= &md_redundancy_group
)
732 sysfs_remove_group(&mddev
->kobj
, to_remove
);
733 if (mddev
->pers
== NULL
||
734 mddev
->pers
->sync_request
== NULL
) {
735 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
736 if (mddev
->sysfs_action
)
737 sysfs_put(mddev
->sysfs_action
);
738 mddev
->sysfs_action
= NULL
;
741 mddev
->sysfs_active
= 0;
743 mutex_unlock(&mddev
->reconfig_mutex
);
745 /* As we've dropped the mutex we need a spinlock to
746 * make sure the thread doesn't disappear
748 spin_lock(&pers_lock
);
749 md_wakeup_thread(mddev
->thread
);
750 spin_unlock(&pers_lock
);
753 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
755 struct md_rdev
*rdev
;
757 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
758 if (rdev
->desc_nr
== nr
)
764 static struct md_rdev
* find_rdev(struct mddev
* mddev
, dev_t dev
)
766 struct md_rdev
*rdev
;
768 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
769 if (rdev
->bdev
->bd_dev
== dev
)
775 static struct md_personality
*find_pers(int level
, char *clevel
)
777 struct md_personality
*pers
;
778 list_for_each_entry(pers
, &pers_list
, list
) {
779 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
781 if (strcmp(pers
->name
, clevel
)==0)
787 /* return the offset of the super block in 512byte sectors */
788 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
790 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
791 return MD_NEW_SIZE_SECTORS(num_sectors
);
794 static int alloc_disk_sb(struct md_rdev
* rdev
)
799 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
800 if (!rdev
->sb_page
) {
801 printk(KERN_ALERT
"md: out of memory.\n");
808 static void free_disk_sb(struct md_rdev
* rdev
)
811 put_page(rdev
->sb_page
);
813 rdev
->sb_page
= NULL
;
818 put_page(rdev
->bb_page
);
819 rdev
->bb_page
= NULL
;
824 static void super_written(struct bio
*bio
, int error
)
826 struct md_rdev
*rdev
= bio
->bi_private
;
827 struct mddev
*mddev
= rdev
->mddev
;
829 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
830 printk("md: super_written gets error=%d, uptodate=%d\n",
831 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
832 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
833 md_error(mddev
, rdev
);
836 if (atomic_dec_and_test(&mddev
->pending_writes
))
837 wake_up(&mddev
->sb_wait
);
841 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
842 sector_t sector
, int size
, struct page
*page
)
844 /* write first size bytes of page to sector of rdev
845 * Increment mddev->pending_writes before returning
846 * and decrement it on completion, waking up sb_wait
847 * if zero is reached.
848 * If an error occurred, call md_error
850 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
852 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
853 bio
->bi_sector
= sector
;
854 bio_add_page(bio
, page
, size
, 0);
855 bio
->bi_private
= rdev
;
856 bio
->bi_end_io
= super_written
;
858 atomic_inc(&mddev
->pending_writes
);
859 submit_bio(WRITE_FLUSH_FUA
, bio
);
862 void md_super_wait(struct mddev
*mddev
)
864 /* wait for all superblock writes that were scheduled to complete */
867 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
868 if (atomic_read(&mddev
->pending_writes
)==0)
872 finish_wait(&mddev
->sb_wait
, &wq
);
875 static void bi_complete(struct bio
*bio
, int error
)
877 complete((struct completion
*)bio
->bi_private
);
880 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
881 struct page
*page
, int rw
, bool metadata_op
)
883 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
884 struct completion event
;
889 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
890 rdev
->meta_bdev
: rdev
->bdev
;
892 bio
->bi_sector
= sector
+ rdev
->sb_start
;
894 bio
->bi_sector
= sector
+ rdev
->data_offset
;
895 bio_add_page(bio
, page
, size
, 0);
896 init_completion(&event
);
897 bio
->bi_private
= &event
;
898 bio
->bi_end_io
= bi_complete
;
900 wait_for_completion(&event
);
902 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
906 EXPORT_SYMBOL_GPL(sync_page_io
);
908 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
910 char b
[BDEVNAME_SIZE
];
911 if (!rdev
->sb_page
) {
919 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
925 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
926 bdevname(rdev
->bdev
,b
));
930 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
932 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
933 sb1
->set_uuid1
== sb2
->set_uuid1
&&
934 sb1
->set_uuid2
== sb2
->set_uuid2
&&
935 sb1
->set_uuid3
== sb2
->set_uuid3
;
938 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
941 mdp_super_t
*tmp1
, *tmp2
;
943 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
944 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
946 if (!tmp1
|| !tmp2
) {
948 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
956 * nr_disks is not constant
961 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
969 static u32
md_csum_fold(u32 csum
)
971 csum
= (csum
& 0xffff) + (csum
>> 16);
972 return (csum
& 0xffff) + (csum
>> 16);
975 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
978 u32
*sb32
= (u32
*)sb
;
980 unsigned int disk_csum
, csum
;
982 disk_csum
= sb
->sb_csum
;
985 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
987 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
991 /* This used to use csum_partial, which was wrong for several
992 * reasons including that different results are returned on
993 * different architectures. It isn't critical that we get exactly
994 * the same return value as before (we always csum_fold before
995 * testing, and that removes any differences). However as we
996 * know that csum_partial always returned a 16bit value on
997 * alphas, do a fold to maximise conformity to previous behaviour.
999 sb
->sb_csum
= md_csum_fold(disk_csum
);
1001 sb
->sb_csum
= disk_csum
;
1008 * Handle superblock details.
1009 * We want to be able to handle multiple superblock formats
1010 * so we have a common interface to them all, and an array of
1011 * different handlers.
1012 * We rely on user-space to write the initial superblock, and support
1013 * reading and updating of superblocks.
1014 * Interface methods are:
1015 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
1016 * loads and validates a superblock on dev.
1017 * if refdev != NULL, compare superblocks on both devices
1019 * 0 - dev has a superblock that is compatible with refdev
1020 * 1 - dev has a superblock that is compatible and newer than refdev
1021 * so dev should be used as the refdev in future
1022 * -EINVAL superblock incompatible or invalid
1023 * -othererror e.g. -EIO
1025 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
1026 * Verify that dev is acceptable into mddev.
1027 * The first time, mddev->raid_disks will be 0, and data from
1028 * dev should be merged in. Subsequent calls check that dev
1029 * is new enough. Return 0 or -EINVAL
1031 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
1032 * Update the superblock for rdev with data in mddev
1033 * This does not write to disc.
1039 struct module
*owner
;
1040 int (*load_super
)(struct md_rdev
*rdev
, struct md_rdev
*refdev
,
1042 int (*validate_super
)(struct mddev
*mddev
, struct md_rdev
*rdev
);
1043 void (*sync_super
)(struct mddev
*mddev
, struct md_rdev
*rdev
);
1044 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
1045 sector_t num_sectors
);
1049 * Check that the given mddev has no bitmap.
1051 * This function is called from the run method of all personalities that do not
1052 * support bitmaps. It prints an error message and returns non-zero if mddev
1053 * has a bitmap. Otherwise, it returns 0.
1056 int md_check_no_bitmap(struct mddev
*mddev
)
1058 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1060 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1061 mdname(mddev
), mddev
->pers
->name
);
1064 EXPORT_SYMBOL(md_check_no_bitmap
);
1067 * load_super for 0.90.0
1069 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1071 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1076 * Calculate the position of the superblock (512byte sectors),
1077 * it's at the end of the disk.
1079 * It also happens to be a multiple of 4Kb.
1081 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1083 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1084 if (ret
) return ret
;
1088 bdevname(rdev
->bdev
, b
);
1089 sb
= page_address(rdev
->sb_page
);
1091 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1092 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1097 if (sb
->major_version
!= 0 ||
1098 sb
->minor_version
< 90 ||
1099 sb
->minor_version
> 91) {
1100 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1101 sb
->major_version
, sb
->minor_version
,
1106 if (sb
->raid_disks
<= 0)
1109 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1110 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1115 rdev
->preferred_minor
= sb
->md_minor
;
1116 rdev
->data_offset
= 0;
1117 rdev
->sb_size
= MD_SB_BYTES
;
1118 rdev
->badblocks
.shift
= -1;
1120 if (sb
->level
== LEVEL_MULTIPATH
)
1123 rdev
->desc_nr
= sb
->this_disk
.number
;
1129 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1130 if (!uuid_equal(refsb
, sb
)) {
1131 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1132 b
, bdevname(refdev
->bdev
,b2
));
1135 if (!sb_equal(refsb
, sb
)) {
1136 printk(KERN_WARNING
"md: %s has same UUID"
1137 " but different superblock to %s\n",
1138 b
, bdevname(refdev
->bdev
, b2
));
1142 ev2
= md_event(refsb
);
1148 rdev
->sectors
= rdev
->sb_start
;
1149 /* Limit to 4TB as metadata cannot record more than that */
1150 if (rdev
->sectors
>= (2ULL << 32))
1151 rdev
->sectors
= (2ULL << 32) - 2;
1153 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1154 /* "this cannot possibly happen" ... */
1162 * validate_super for 0.90.0
1164 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1167 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1168 __u64 ev1
= md_event(sb
);
1170 rdev
->raid_disk
= -1;
1171 clear_bit(Faulty
, &rdev
->flags
);
1172 clear_bit(In_sync
, &rdev
->flags
);
1173 clear_bit(WriteMostly
, &rdev
->flags
);
1175 if (mddev
->raid_disks
== 0) {
1176 mddev
->major_version
= 0;
1177 mddev
->minor_version
= sb
->minor_version
;
1178 mddev
->patch_version
= sb
->patch_version
;
1179 mddev
->external
= 0;
1180 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1181 mddev
->ctime
= sb
->ctime
;
1182 mddev
->utime
= sb
->utime
;
1183 mddev
->level
= sb
->level
;
1184 mddev
->clevel
[0] = 0;
1185 mddev
->layout
= sb
->layout
;
1186 mddev
->raid_disks
= sb
->raid_disks
;
1187 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1188 mddev
->events
= ev1
;
1189 mddev
->bitmap_info
.offset
= 0;
1190 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1192 if (mddev
->minor_version
>= 91) {
1193 mddev
->reshape_position
= sb
->reshape_position
;
1194 mddev
->delta_disks
= sb
->delta_disks
;
1195 mddev
->new_level
= sb
->new_level
;
1196 mddev
->new_layout
= sb
->new_layout
;
1197 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1199 mddev
->reshape_position
= MaxSector
;
1200 mddev
->delta_disks
= 0;
1201 mddev
->new_level
= mddev
->level
;
1202 mddev
->new_layout
= mddev
->layout
;
1203 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1206 if (sb
->state
& (1<<MD_SB_CLEAN
))
1207 mddev
->recovery_cp
= MaxSector
;
1209 if (sb
->events_hi
== sb
->cp_events_hi
&&
1210 sb
->events_lo
== sb
->cp_events_lo
) {
1211 mddev
->recovery_cp
= sb
->recovery_cp
;
1213 mddev
->recovery_cp
= 0;
1216 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1217 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1218 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1219 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1221 mddev
->max_disks
= MD_SB_DISKS
;
1223 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1224 mddev
->bitmap_info
.file
== NULL
)
1225 mddev
->bitmap_info
.offset
=
1226 mddev
->bitmap_info
.default_offset
;
1228 } else if (mddev
->pers
== NULL
) {
1229 /* Insist on good event counter while assembling, except
1230 * for spares (which don't need an event count) */
1232 if (sb
->disks
[rdev
->desc_nr
].state
& (
1233 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1234 if (ev1
< mddev
->events
)
1236 } else if (mddev
->bitmap
) {
1237 /* if adding to array with a bitmap, then we can accept an
1238 * older device ... but not too old.
1240 if (ev1
< mddev
->bitmap
->events_cleared
)
1243 if (ev1
< mddev
->events
)
1244 /* just a hot-add of a new device, leave raid_disk at -1 */
1248 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1249 desc
= sb
->disks
+ rdev
->desc_nr
;
1251 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1252 set_bit(Faulty
, &rdev
->flags
);
1253 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1254 desc->raid_disk < mddev->raid_disks */) {
1255 set_bit(In_sync
, &rdev
->flags
);
1256 rdev
->raid_disk
= desc
->raid_disk
;
1257 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1258 /* active but not in sync implies recovery up to
1259 * reshape position. We don't know exactly where
1260 * that is, so set to zero for now */
1261 if (mddev
->minor_version
>= 91) {
1262 rdev
->recovery_offset
= 0;
1263 rdev
->raid_disk
= desc
->raid_disk
;
1266 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1267 set_bit(WriteMostly
, &rdev
->flags
);
1268 } else /* MULTIPATH are always insync */
1269 set_bit(In_sync
, &rdev
->flags
);
1274 * sync_super for 0.90.0
1276 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1279 struct md_rdev
*rdev2
;
1280 int next_spare
= mddev
->raid_disks
;
1283 /* make rdev->sb match mddev data..
1286 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1287 * 3/ any empty disks < next_spare become removed
1289 * disks[0] gets initialised to REMOVED because
1290 * we cannot be sure from other fields if it has
1291 * been initialised or not.
1294 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1296 rdev
->sb_size
= MD_SB_BYTES
;
1298 sb
= page_address(rdev
->sb_page
);
1300 memset(sb
, 0, sizeof(*sb
));
1302 sb
->md_magic
= MD_SB_MAGIC
;
1303 sb
->major_version
= mddev
->major_version
;
1304 sb
->patch_version
= mddev
->patch_version
;
1305 sb
->gvalid_words
= 0; /* ignored */
1306 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1307 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1308 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1309 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1311 sb
->ctime
= mddev
->ctime
;
1312 sb
->level
= mddev
->level
;
1313 sb
->size
= mddev
->dev_sectors
/ 2;
1314 sb
->raid_disks
= mddev
->raid_disks
;
1315 sb
->md_minor
= mddev
->md_minor
;
1316 sb
->not_persistent
= 0;
1317 sb
->utime
= mddev
->utime
;
1319 sb
->events_hi
= (mddev
->events
>>32);
1320 sb
->events_lo
= (u32
)mddev
->events
;
1322 if (mddev
->reshape_position
== MaxSector
)
1323 sb
->minor_version
= 90;
1325 sb
->minor_version
= 91;
1326 sb
->reshape_position
= mddev
->reshape_position
;
1327 sb
->new_level
= mddev
->new_level
;
1328 sb
->delta_disks
= mddev
->delta_disks
;
1329 sb
->new_layout
= mddev
->new_layout
;
1330 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1332 mddev
->minor_version
= sb
->minor_version
;
1335 sb
->recovery_cp
= mddev
->recovery_cp
;
1336 sb
->cp_events_hi
= (mddev
->events
>>32);
1337 sb
->cp_events_lo
= (u32
)mddev
->events
;
1338 if (mddev
->recovery_cp
== MaxSector
)
1339 sb
->state
= (1<< MD_SB_CLEAN
);
1341 sb
->recovery_cp
= 0;
1343 sb
->layout
= mddev
->layout
;
1344 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1346 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1347 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1349 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1350 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1353 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1355 if (rdev2
->raid_disk
>= 0 &&
1356 sb
->minor_version
>= 91)
1357 /* we have nowhere to store the recovery_offset,
1358 * but if it is not below the reshape_position,
1359 * we can piggy-back on that.
1362 if (rdev2
->raid_disk
< 0 ||
1363 test_bit(Faulty
, &rdev2
->flags
))
1366 desc_nr
= rdev2
->raid_disk
;
1368 desc_nr
= next_spare
++;
1369 rdev2
->desc_nr
= desc_nr
;
1370 d
= &sb
->disks
[rdev2
->desc_nr
];
1372 d
->number
= rdev2
->desc_nr
;
1373 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1374 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1376 d
->raid_disk
= rdev2
->raid_disk
;
1378 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1379 if (test_bit(Faulty
, &rdev2
->flags
))
1380 d
->state
= (1<<MD_DISK_FAULTY
);
1381 else if (is_active
) {
1382 d
->state
= (1<<MD_DISK_ACTIVE
);
1383 if (test_bit(In_sync
, &rdev2
->flags
))
1384 d
->state
|= (1<<MD_DISK_SYNC
);
1392 if (test_bit(WriteMostly
, &rdev2
->flags
))
1393 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1395 /* now set the "removed" and "faulty" bits on any missing devices */
1396 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1397 mdp_disk_t
*d
= &sb
->disks
[i
];
1398 if (d
->state
== 0 && d
->number
== 0) {
1401 d
->state
= (1<<MD_DISK_REMOVED
);
1402 d
->state
|= (1<<MD_DISK_FAULTY
);
1406 sb
->nr_disks
= nr_disks
;
1407 sb
->active_disks
= active
;
1408 sb
->working_disks
= working
;
1409 sb
->failed_disks
= failed
;
1410 sb
->spare_disks
= spare
;
1412 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1413 sb
->sb_csum
= calc_sb_csum(sb
);
1417 * rdev_size_change for 0.90.0
1419 static unsigned long long
1420 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1422 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1423 return 0; /* component must fit device */
1424 if (rdev
->mddev
->bitmap_info
.offset
)
1425 return 0; /* can't move bitmap */
1426 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1427 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1428 num_sectors
= rdev
->sb_start
;
1429 /* Limit to 4TB as metadata cannot record more than that.
1430 * 4TB == 2^32 KB, or 2*2^32 sectors.
1432 if (num_sectors
>= (2ULL << 32))
1433 num_sectors
= (2ULL << 32) - 2;
1434 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1436 md_super_wait(rdev
->mddev
);
1442 * version 1 superblock
1445 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1449 unsigned long long newcsum
;
1450 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1451 __le32
*isuper
= (__le32
*)sb
;
1454 disk_csum
= sb
->sb_csum
;
1457 for (i
=0; size
>=4; size
-= 4 )
1458 newcsum
+= le32_to_cpu(*isuper
++);
1461 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1463 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1464 sb
->sb_csum
= disk_csum
;
1465 return cpu_to_le32(csum
);
1468 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1470 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1472 struct mdp_superblock_1
*sb
;
1475 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1479 * Calculate the position of the superblock in 512byte sectors.
1480 * It is always aligned to a 4K boundary and
1481 * depeding on minor_version, it can be:
1482 * 0: At least 8K, but less than 12K, from end of device
1483 * 1: At start of device
1484 * 2: 4K from start of device.
1486 switch(minor_version
) {
1488 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1490 sb_start
&= ~(sector_t
)(4*2-1);
1501 rdev
->sb_start
= sb_start
;
1503 /* superblock is rarely larger than 1K, but it can be larger,
1504 * and it is safe to read 4k, so we do that
1506 ret
= read_disk_sb(rdev
, 4096);
1507 if (ret
) return ret
;
1510 sb
= page_address(rdev
->sb_page
);
1512 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1513 sb
->major_version
!= cpu_to_le32(1) ||
1514 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1515 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1516 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1519 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1520 printk("md: invalid superblock checksum on %s\n",
1521 bdevname(rdev
->bdev
,b
));
1524 if (le64_to_cpu(sb
->data_size
) < 10) {
1525 printk("md: data_size too small on %s\n",
1526 bdevname(rdev
->bdev
,b
));
1530 rdev
->preferred_minor
= 0xffff;
1531 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1532 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1534 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1535 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1536 if (rdev
->sb_size
& bmask
)
1537 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1540 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1543 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1546 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1548 if (!rdev
->bb_page
) {
1549 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1553 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1554 rdev
->badblocks
.count
== 0) {
1555 /* need to load the bad block list.
1556 * Currently we limit it to one page.
1562 int sectors
= le16_to_cpu(sb
->bblog_size
);
1563 if (sectors
> (PAGE_SIZE
/ 512))
1565 offset
= le32_to_cpu(sb
->bblog_offset
);
1568 bb_sector
= (long long)offset
;
1569 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1570 rdev
->bb_page
, READ
, true))
1572 bbp
= (u64
*)page_address(rdev
->bb_page
);
1573 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1574 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1575 u64 bb
= le64_to_cpu(*bbp
);
1576 int count
= bb
& (0x3ff);
1577 u64 sector
= bb
>> 10;
1578 sector
<<= sb
->bblog_shift
;
1579 count
<<= sb
->bblog_shift
;
1582 if (md_set_badblocks(&rdev
->badblocks
,
1583 sector
, count
, 1) == 0)
1586 } else if (sb
->bblog_offset
== 0)
1587 rdev
->badblocks
.shift
= -1;
1593 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1595 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1596 sb
->level
!= refsb
->level
||
1597 sb
->layout
!= refsb
->layout
||
1598 sb
->chunksize
!= refsb
->chunksize
) {
1599 printk(KERN_WARNING
"md: %s has strangely different"
1600 " superblock to %s\n",
1601 bdevname(rdev
->bdev
,b
),
1602 bdevname(refdev
->bdev
,b2
));
1605 ev1
= le64_to_cpu(sb
->events
);
1606 ev2
= le64_to_cpu(refsb
->events
);
1614 rdev
->sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
1615 le64_to_cpu(sb
->data_offset
);
1617 rdev
->sectors
= rdev
->sb_start
;
1618 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1620 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1621 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1626 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1628 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1629 __u64 ev1
= le64_to_cpu(sb
->events
);
1631 rdev
->raid_disk
= -1;
1632 clear_bit(Faulty
, &rdev
->flags
);
1633 clear_bit(In_sync
, &rdev
->flags
);
1634 clear_bit(WriteMostly
, &rdev
->flags
);
1636 if (mddev
->raid_disks
== 0) {
1637 mddev
->major_version
= 1;
1638 mddev
->patch_version
= 0;
1639 mddev
->external
= 0;
1640 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1641 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1642 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1643 mddev
->level
= le32_to_cpu(sb
->level
);
1644 mddev
->clevel
[0] = 0;
1645 mddev
->layout
= le32_to_cpu(sb
->layout
);
1646 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1647 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1648 mddev
->events
= ev1
;
1649 mddev
->bitmap_info
.offset
= 0;
1650 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1652 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1653 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1655 mddev
->max_disks
= (4096-256)/2;
1657 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1658 mddev
->bitmap_info
.file
== NULL
)
1659 mddev
->bitmap_info
.offset
=
1660 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1662 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1663 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1664 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1665 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1666 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1667 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
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 } else /* MULTIPATH are always insync */
1722 set_bit(In_sync
, &rdev
->flags
);
1727 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1729 struct mdp_superblock_1
*sb
;
1730 struct md_rdev
*rdev2
;
1732 /* make rdev->sb match mddev and rdev data. */
1734 sb
= page_address(rdev
->sb_page
);
1736 sb
->feature_map
= 0;
1738 sb
->recovery_offset
= cpu_to_le64(0);
1739 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1740 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1742 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1743 sb
->events
= cpu_to_le64(mddev
->events
);
1745 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1747 sb
->resync_offset
= cpu_to_le64(0);
1749 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1751 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1752 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1753 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1754 sb
->level
= cpu_to_le32(mddev
->level
);
1755 sb
->layout
= cpu_to_le32(mddev
->layout
);
1757 if (test_bit(WriteMostly
, &rdev
->flags
))
1758 sb
->devflags
|= WriteMostly1
;
1760 sb
->devflags
&= ~WriteMostly1
;
1762 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1763 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1764 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1767 if (rdev
->raid_disk
>= 0 &&
1768 !test_bit(In_sync
, &rdev
->flags
)) {
1770 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1771 sb
->recovery_offset
=
1772 cpu_to_le64(rdev
->recovery_offset
);
1775 if (mddev
->reshape_position
!= MaxSector
) {
1776 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1777 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1778 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1779 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1780 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1781 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1784 if (rdev
->badblocks
.count
== 0)
1785 /* Nothing to do for bad blocks*/ ;
1786 else if (sb
->bblog_offset
== 0)
1787 /* Cannot record bad blocks on this device */
1788 md_error(mddev
, rdev
);
1790 struct badblocks
*bb
= &rdev
->badblocks
;
1791 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1793 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1798 seq
= read_seqbegin(&bb
->lock
);
1800 memset(bbp
, 0xff, PAGE_SIZE
);
1802 for (i
= 0 ; i
< bb
->count
; i
++) {
1803 u64 internal_bb
= *p
++;
1804 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1805 | BB_LEN(internal_bb
));
1806 *bbp
++ = cpu_to_le64(store_bb
);
1808 if (read_seqretry(&bb
->lock
, seq
))
1811 bb
->sector
= (rdev
->sb_start
+
1812 (int)le32_to_cpu(sb
->bblog_offset
));
1813 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1819 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1820 if (rdev2
->desc_nr
+1 > max_dev
)
1821 max_dev
= rdev2
->desc_nr
+1;
1823 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1825 sb
->max_dev
= cpu_to_le32(max_dev
);
1826 rdev
->sb_size
= max_dev
* 2 + 256;
1827 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1828 if (rdev
->sb_size
& bmask
)
1829 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1831 max_dev
= le32_to_cpu(sb
->max_dev
);
1833 for (i
=0; i
<max_dev
;i
++)
1834 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1836 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1838 if (test_bit(Faulty
, &rdev2
->flags
))
1839 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1840 else if (test_bit(In_sync
, &rdev2
->flags
))
1841 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1842 else if (rdev2
->raid_disk
>= 0)
1843 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1845 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1848 sb
->sb_csum
= calc_sb_1_csum(sb
);
1851 static unsigned long long
1852 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1854 struct mdp_superblock_1
*sb
;
1855 sector_t max_sectors
;
1856 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1857 return 0; /* component must fit device */
1858 if (rdev
->sb_start
< rdev
->data_offset
) {
1859 /* minor versions 1 and 2; superblock before data */
1860 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1861 max_sectors
-= rdev
->data_offset
;
1862 if (!num_sectors
|| num_sectors
> max_sectors
)
1863 num_sectors
= max_sectors
;
1864 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1865 /* minor version 0 with bitmap we can't move */
1868 /* minor version 0; superblock after data */
1870 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1871 sb_start
&= ~(sector_t
)(4*2 - 1);
1872 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1873 if (!num_sectors
|| num_sectors
> max_sectors
)
1874 num_sectors
= max_sectors
;
1875 rdev
->sb_start
= sb_start
;
1877 sb
= page_address(rdev
->sb_page
);
1878 sb
->data_size
= cpu_to_le64(num_sectors
);
1879 sb
->super_offset
= rdev
->sb_start
;
1880 sb
->sb_csum
= calc_sb_1_csum(sb
);
1881 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1883 md_super_wait(rdev
->mddev
);
1887 static struct super_type super_types
[] = {
1890 .owner
= THIS_MODULE
,
1891 .load_super
= super_90_load
,
1892 .validate_super
= super_90_validate
,
1893 .sync_super
= super_90_sync
,
1894 .rdev_size_change
= super_90_rdev_size_change
,
1898 .owner
= THIS_MODULE
,
1899 .load_super
= super_1_load
,
1900 .validate_super
= super_1_validate
,
1901 .sync_super
= super_1_sync
,
1902 .rdev_size_change
= super_1_rdev_size_change
,
1906 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1908 if (mddev
->sync_super
) {
1909 mddev
->sync_super(mddev
, rdev
);
1913 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1915 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1918 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1920 struct md_rdev
*rdev
, *rdev2
;
1923 rdev_for_each_rcu(rdev
, mddev1
)
1924 rdev_for_each_rcu(rdev2
, mddev2
)
1925 if (rdev
->bdev
->bd_contains
==
1926 rdev2
->bdev
->bd_contains
) {
1934 static LIST_HEAD(pending_raid_disks
);
1937 * Try to register data integrity profile for an mddev
1939 * This is called when an array is started and after a disk has been kicked
1940 * from the array. It only succeeds if all working and active component devices
1941 * are integrity capable with matching profiles.
1943 int md_integrity_register(struct mddev
*mddev
)
1945 struct md_rdev
*rdev
, *reference
= NULL
;
1947 if (list_empty(&mddev
->disks
))
1948 return 0; /* nothing to do */
1949 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1950 return 0; /* shouldn't register, or already is */
1951 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1952 /* skip spares and non-functional disks */
1953 if (test_bit(Faulty
, &rdev
->flags
))
1955 if (rdev
->raid_disk
< 0)
1958 /* Use the first rdev as the reference */
1962 /* does this rdev's profile match the reference profile? */
1963 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1964 rdev
->bdev
->bd_disk
) < 0)
1967 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1970 * All component devices are integrity capable and have matching
1971 * profiles, register the common profile for the md device.
1973 if (blk_integrity_register(mddev
->gendisk
,
1974 bdev_get_integrity(reference
->bdev
)) != 0) {
1975 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1979 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1980 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1981 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1987 EXPORT_SYMBOL(md_integrity_register
);
1989 /* Disable data integrity if non-capable/non-matching disk is being added */
1990 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1992 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1993 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1995 if (!bi_mddev
) /* nothing to do */
1997 if (rdev
->raid_disk
< 0) /* skip spares */
1999 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2000 rdev
->bdev
->bd_disk
) >= 0)
2002 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2003 blk_integrity_unregister(mddev
->gendisk
);
2005 EXPORT_SYMBOL(md_integrity_add_rdev
);
2007 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2009 char b
[BDEVNAME_SIZE
];
2019 /* prevent duplicates */
2020 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2023 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2024 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2025 rdev
->sectors
< mddev
->dev_sectors
)) {
2027 /* Cannot change size, so fail
2028 * If mddev->level <= 0, then we don't care
2029 * about aligning sizes (e.g. linear)
2031 if (mddev
->level
> 0)
2034 mddev
->dev_sectors
= rdev
->sectors
;
2037 /* Verify rdev->desc_nr is unique.
2038 * If it is -1, assign a free number, else
2039 * check number is not in use
2041 if (rdev
->desc_nr
< 0) {
2043 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2044 while (find_rdev_nr(mddev
, choice
))
2046 rdev
->desc_nr
= choice
;
2048 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2051 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2052 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2053 mdname(mddev
), mddev
->max_disks
);
2056 bdevname(rdev
->bdev
,b
);
2057 while ( (s
=strchr(b
, '/')) != NULL
)
2060 rdev
->mddev
= mddev
;
2061 printk(KERN_INFO
"md: bind<%s>\n", b
);
2063 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2066 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2067 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2068 /* failure here is OK */;
2069 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2071 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2072 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2074 /* May as well allow recovery to be retried once */
2075 mddev
->recovery_disabled
++;
2080 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2085 static void md_delayed_delete(struct work_struct
*ws
)
2087 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2088 kobject_del(&rdev
->kobj
);
2089 kobject_put(&rdev
->kobj
);
2092 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2094 char b
[BDEVNAME_SIZE
];
2099 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2100 list_del_rcu(&rdev
->same_set
);
2101 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2103 sysfs_remove_link(&rdev
->kobj
, "block");
2104 sysfs_put(rdev
->sysfs_state
);
2105 rdev
->sysfs_state
= NULL
;
2106 kfree(rdev
->badblocks
.page
);
2107 rdev
->badblocks
.count
= 0;
2108 rdev
->badblocks
.page
= NULL
;
2109 /* We need to delay this, otherwise we can deadlock when
2110 * writing to 'remove' to "dev/state". We also need
2111 * to delay it due to rcu usage.
2114 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2115 kobject_get(&rdev
->kobj
);
2116 queue_work(md_misc_wq
, &rdev
->del_work
);
2120 * prevent the device from being mounted, repartitioned or
2121 * otherwise reused by a RAID array (or any other kernel
2122 * subsystem), by bd_claiming the device.
2124 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2127 struct block_device
*bdev
;
2128 char b
[BDEVNAME_SIZE
];
2130 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2131 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2133 printk(KERN_ERR
"md: could not open %s.\n",
2134 __bdevname(dev
, b
));
2135 return PTR_ERR(bdev
);
2141 static void unlock_rdev(struct md_rdev
*rdev
)
2143 struct block_device
*bdev
= rdev
->bdev
;
2147 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2150 void md_autodetect_dev(dev_t dev
);
2152 static void export_rdev(struct md_rdev
* rdev
)
2154 char b
[BDEVNAME_SIZE
];
2155 printk(KERN_INFO
"md: export_rdev(%s)\n",
2156 bdevname(rdev
->bdev
,b
));
2161 if (test_bit(AutoDetected
, &rdev
->flags
))
2162 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2165 kobject_put(&rdev
->kobj
);
2168 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2170 unbind_rdev_from_array(rdev
);
2174 static void export_array(struct mddev
*mddev
)
2176 struct md_rdev
*rdev
, *tmp
;
2178 rdev_for_each(rdev
, tmp
, mddev
) {
2183 kick_rdev_from_array(rdev
);
2185 if (!list_empty(&mddev
->disks
))
2187 mddev
->raid_disks
= 0;
2188 mddev
->major_version
= 0;
2191 static void print_desc(mdp_disk_t
*desc
)
2193 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2194 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2197 static void print_sb_90(mdp_super_t
*sb
)
2202 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2203 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2204 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2206 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2207 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2208 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2209 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2210 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2211 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2212 sb
->failed_disks
, sb
->spare_disks
,
2213 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2216 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2219 desc
= sb
->disks
+ i
;
2220 if (desc
->number
|| desc
->major
|| desc
->minor
||
2221 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2222 printk(" D %2d: ", i
);
2226 printk(KERN_INFO
"md: THIS: ");
2227 print_desc(&sb
->this_disk
);
2230 static void print_sb_1(struct mdp_superblock_1
*sb
)
2234 uuid
= sb
->set_uuid
;
2236 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2237 "md: Name: \"%s\" CT:%llu\n",
2238 le32_to_cpu(sb
->major_version
),
2239 le32_to_cpu(sb
->feature_map
),
2242 (unsigned long long)le64_to_cpu(sb
->ctime
)
2243 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2245 uuid
= sb
->device_uuid
;
2247 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2249 "md: Dev:%08x UUID: %pU\n"
2250 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2251 "md: (MaxDev:%u) \n",
2252 le32_to_cpu(sb
->level
),
2253 (unsigned long long)le64_to_cpu(sb
->size
),
2254 le32_to_cpu(sb
->raid_disks
),
2255 le32_to_cpu(sb
->layout
),
2256 le32_to_cpu(sb
->chunksize
),
2257 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2258 (unsigned long long)le64_to_cpu(sb
->data_size
),
2259 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2260 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2261 le32_to_cpu(sb
->dev_number
),
2264 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2265 (unsigned long long)le64_to_cpu(sb
->events
),
2266 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2267 le32_to_cpu(sb
->sb_csum
),
2268 le32_to_cpu(sb
->max_dev
)
2272 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2274 char b
[BDEVNAME_SIZE
];
2275 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2276 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2277 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2279 if (rdev
->sb_loaded
) {
2280 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2281 switch (major_version
) {
2283 print_sb_90(page_address(rdev
->sb_page
));
2286 print_sb_1(page_address(rdev
->sb_page
));
2290 printk(KERN_INFO
"md: no rdev superblock!\n");
2293 static void md_print_devices(void)
2295 struct list_head
*tmp
;
2296 struct md_rdev
*rdev
;
2297 struct mddev
*mddev
;
2298 char b
[BDEVNAME_SIZE
];
2301 printk("md: **********************************\n");
2302 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2303 printk("md: **********************************\n");
2304 for_each_mddev(mddev
, tmp
) {
2307 bitmap_print_sb(mddev
->bitmap
);
2309 printk("%s: ", mdname(mddev
));
2310 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2311 printk("<%s>", bdevname(rdev
->bdev
,b
));
2314 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2315 print_rdev(rdev
, mddev
->major_version
);
2317 printk("md: **********************************\n");
2322 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2324 /* Update each superblock (in-memory image), but
2325 * if we are allowed to, skip spares which already
2326 * have the right event counter, or have one earlier
2327 * (which would mean they aren't being marked as dirty
2328 * with the rest of the array)
2330 struct md_rdev
*rdev
;
2331 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2332 if (rdev
->sb_events
== mddev
->events
||
2334 rdev
->raid_disk
< 0 &&
2335 rdev
->sb_events
+1 == mddev
->events
)) {
2336 /* Don't update this superblock */
2337 rdev
->sb_loaded
= 2;
2339 sync_super(mddev
, rdev
);
2340 rdev
->sb_loaded
= 1;
2345 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2347 struct md_rdev
*rdev
;
2350 int any_badblocks_changed
= 0;
2353 /* First make sure individual recovery_offsets are correct */
2354 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2355 if (rdev
->raid_disk
>= 0 &&
2356 mddev
->delta_disks
>= 0 &&
2357 !test_bit(In_sync
, &rdev
->flags
) &&
2358 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2359 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2362 if (!mddev
->persistent
) {
2363 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2364 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2365 if (!mddev
->external
) {
2366 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2367 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2368 if (rdev
->badblocks
.changed
) {
2369 md_ack_all_badblocks(&rdev
->badblocks
);
2370 md_error(mddev
, rdev
);
2372 clear_bit(Blocked
, &rdev
->flags
);
2373 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2374 wake_up(&rdev
->blocked_wait
);
2377 wake_up(&mddev
->sb_wait
);
2381 spin_lock_irq(&mddev
->write_lock
);
2383 mddev
->utime
= get_seconds();
2385 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2387 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2388 /* just a clean<-> dirty transition, possibly leave spares alone,
2389 * though if events isn't the right even/odd, we will have to do
2395 if (mddev
->degraded
)
2396 /* If the array is degraded, then skipping spares is both
2397 * dangerous and fairly pointless.
2398 * Dangerous because a device that was removed from the array
2399 * might have a event_count that still looks up-to-date,
2400 * so it can be re-added without a resync.
2401 * Pointless because if there are any spares to skip,
2402 * then a recovery will happen and soon that array won't
2403 * be degraded any more and the spare can go back to sleep then.
2407 sync_req
= mddev
->in_sync
;
2409 /* If this is just a dirty<->clean transition, and the array is clean
2410 * and 'events' is odd, we can roll back to the previous clean state */
2412 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2413 && mddev
->can_decrease_events
2414 && mddev
->events
!= 1) {
2416 mddev
->can_decrease_events
= 0;
2418 /* otherwise we have to go forward and ... */
2420 mddev
->can_decrease_events
= nospares
;
2423 if (!mddev
->events
) {
2425 * oops, this 64-bit counter should never wrap.
2426 * Either we are in around ~1 trillion A.C., assuming
2427 * 1 reboot per second, or we have a bug:
2433 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2434 if (rdev
->badblocks
.changed
)
2435 any_badblocks_changed
++;
2436 if (test_bit(Faulty
, &rdev
->flags
))
2437 set_bit(FaultRecorded
, &rdev
->flags
);
2440 sync_sbs(mddev
, nospares
);
2441 spin_unlock_irq(&mddev
->write_lock
);
2443 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2444 mdname(mddev
), mddev
->in_sync
);
2446 bitmap_update_sb(mddev
->bitmap
);
2447 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2448 char b
[BDEVNAME_SIZE
];
2450 if (rdev
->sb_loaded
!= 1)
2451 continue; /* no noise on spare devices */
2453 if (!test_bit(Faulty
, &rdev
->flags
) &&
2454 rdev
->saved_raid_disk
== -1) {
2455 md_super_write(mddev
,rdev
,
2456 rdev
->sb_start
, rdev
->sb_size
,
2458 pr_debug("md: (write) %s's sb offset: %llu\n",
2459 bdevname(rdev
->bdev
, b
),
2460 (unsigned long long)rdev
->sb_start
);
2461 rdev
->sb_events
= mddev
->events
;
2462 if (rdev
->badblocks
.size
) {
2463 md_super_write(mddev
, rdev
,
2464 rdev
->badblocks
.sector
,
2465 rdev
->badblocks
.size
<< 9,
2467 rdev
->badblocks
.size
= 0;
2470 } else if (test_bit(Faulty
, &rdev
->flags
))
2471 pr_debug("md: %s (skipping faulty)\n",
2472 bdevname(rdev
->bdev
, b
));
2474 pr_debug("(skipping incremental s/r ");
2476 if (mddev
->level
== LEVEL_MULTIPATH
)
2477 /* only need to write one superblock... */
2480 md_super_wait(mddev
);
2481 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2483 spin_lock_irq(&mddev
->write_lock
);
2484 if (mddev
->in_sync
!= sync_req
||
2485 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2486 /* have to write it out again */
2487 spin_unlock_irq(&mddev
->write_lock
);
2490 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2491 spin_unlock_irq(&mddev
->write_lock
);
2492 wake_up(&mddev
->sb_wait
);
2493 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2494 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2496 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2497 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2498 clear_bit(Blocked
, &rdev
->flags
);
2500 if (any_badblocks_changed
)
2501 md_ack_all_badblocks(&rdev
->badblocks
);
2502 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2503 wake_up(&rdev
->blocked_wait
);
2507 /* words written to sysfs files may, or may not, be \n terminated.
2508 * We want to accept with case. For this we use cmd_match.
2510 static int cmd_match(const char *cmd
, const char *str
)
2512 /* See if cmd, written into a sysfs file, matches
2513 * str. They must either be the same, or cmd can
2514 * have a trailing newline
2516 while (*cmd
&& *str
&& *cmd
== *str
) {
2527 struct rdev_sysfs_entry
{
2528 struct attribute attr
;
2529 ssize_t (*show
)(struct md_rdev
*, char *);
2530 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2534 state_show(struct md_rdev
*rdev
, char *page
)
2539 if (test_bit(Faulty
, &rdev
->flags
) ||
2540 rdev
->badblocks
.unacked_exist
) {
2541 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2544 if (test_bit(In_sync
, &rdev
->flags
)) {
2545 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2548 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2549 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2552 if (test_bit(Blocked
, &rdev
->flags
) ||
2553 rdev
->badblocks
.unacked_exist
) {
2554 len
+= sprintf(page
+len
, "%sblocked", sep
);
2557 if (!test_bit(Faulty
, &rdev
->flags
) &&
2558 !test_bit(In_sync
, &rdev
->flags
)) {
2559 len
+= sprintf(page
+len
, "%sspare", sep
);
2562 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2563 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2566 return len
+sprintf(page
+len
, "\n");
2570 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2573 * faulty - simulates an error
2574 * remove - disconnects the device
2575 * writemostly - sets write_mostly
2576 * -writemostly - clears write_mostly
2577 * blocked - sets the Blocked flags
2578 * -blocked - clears the Blocked and possibly simulates an error
2579 * insync - sets Insync providing device isn't active
2580 * write_error - sets WriteErrorSeen
2581 * -write_error - clears WriteErrorSeen
2584 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2585 md_error(rdev
->mddev
, rdev
);
2586 if (test_bit(Faulty
, &rdev
->flags
))
2590 } else if (cmd_match(buf
, "remove")) {
2591 if (rdev
->raid_disk
>= 0)
2594 struct mddev
*mddev
= rdev
->mddev
;
2595 kick_rdev_from_array(rdev
);
2597 md_update_sb(mddev
, 1);
2598 md_new_event(mddev
);
2601 } else if (cmd_match(buf
, "writemostly")) {
2602 set_bit(WriteMostly
, &rdev
->flags
);
2604 } else if (cmd_match(buf
, "-writemostly")) {
2605 clear_bit(WriteMostly
, &rdev
->flags
);
2607 } else if (cmd_match(buf
, "blocked")) {
2608 set_bit(Blocked
, &rdev
->flags
);
2610 } else if (cmd_match(buf
, "-blocked")) {
2611 if (!test_bit(Faulty
, &rdev
->flags
) &&
2612 rdev
->badblocks
.unacked_exist
) {
2613 /* metadata handler doesn't understand badblocks,
2614 * so we need to fail the device
2616 md_error(rdev
->mddev
, rdev
);
2618 clear_bit(Blocked
, &rdev
->flags
);
2619 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2620 wake_up(&rdev
->blocked_wait
);
2621 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2622 md_wakeup_thread(rdev
->mddev
->thread
);
2625 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2626 set_bit(In_sync
, &rdev
->flags
);
2628 } else if (cmd_match(buf
, "write_error")) {
2629 set_bit(WriteErrorSeen
, &rdev
->flags
);
2631 } else if (cmd_match(buf
, "-write_error")) {
2632 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2636 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2637 return err
? err
: len
;
2639 static struct rdev_sysfs_entry rdev_state
=
2640 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2643 errors_show(struct md_rdev
*rdev
, char *page
)
2645 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2649 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2652 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2653 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2654 atomic_set(&rdev
->corrected_errors
, n
);
2659 static struct rdev_sysfs_entry rdev_errors
=
2660 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2663 slot_show(struct md_rdev
*rdev
, char *page
)
2665 if (rdev
->raid_disk
< 0)
2666 return sprintf(page
, "none\n");
2668 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2672 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2676 int slot
= simple_strtoul(buf
, &e
, 10);
2677 if (strncmp(buf
, "none", 4)==0)
2679 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2681 if (rdev
->mddev
->pers
&& slot
== -1) {
2682 /* Setting 'slot' on an active array requires also
2683 * updating the 'rd%d' link, and communicating
2684 * with the personality with ->hot_*_disk.
2685 * For now we only support removing
2686 * failed/spare devices. This normally happens automatically,
2687 * but not when the metadata is externally managed.
2689 if (rdev
->raid_disk
== -1)
2691 /* personality does all needed checks */
2692 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2694 err
= rdev
->mddev
->pers
->
2695 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2698 sysfs_unlink_rdev(rdev
->mddev
, rdev
);
2699 rdev
->raid_disk
= -1;
2700 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2701 md_wakeup_thread(rdev
->mddev
->thread
);
2702 } else if (rdev
->mddev
->pers
) {
2703 struct md_rdev
*rdev2
;
2704 /* Activating a spare .. or possibly reactivating
2705 * if we ever get bitmaps working here.
2708 if (rdev
->raid_disk
!= -1)
2711 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2714 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2717 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2718 if (rdev2
->raid_disk
== slot
)
2721 if (slot
>= rdev
->mddev
->raid_disks
&&
2722 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2725 rdev
->raid_disk
= slot
;
2726 if (test_bit(In_sync
, &rdev
->flags
))
2727 rdev
->saved_raid_disk
= slot
;
2729 rdev
->saved_raid_disk
= -1;
2730 clear_bit(In_sync
, &rdev
->flags
);
2731 err
= rdev
->mddev
->pers
->
2732 hot_add_disk(rdev
->mddev
, rdev
);
2734 rdev
->raid_disk
= -1;
2737 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2738 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2739 /* failure here is OK */;
2740 /* don't wakeup anyone, leave that to userspace. */
2742 if (slot
>= rdev
->mddev
->raid_disks
&&
2743 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2745 rdev
->raid_disk
= slot
;
2746 /* assume it is working */
2747 clear_bit(Faulty
, &rdev
->flags
);
2748 clear_bit(WriteMostly
, &rdev
->flags
);
2749 set_bit(In_sync
, &rdev
->flags
);
2750 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2756 static struct rdev_sysfs_entry rdev_slot
=
2757 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2760 offset_show(struct md_rdev
*rdev
, char *page
)
2762 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2766 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2769 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2770 if (e
==buf
|| (*e
&& *e
!= '\n'))
2772 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2774 if (rdev
->sectors
&& rdev
->mddev
->external
)
2775 /* Must set offset before size, so overlap checks
2778 rdev
->data_offset
= offset
;
2782 static struct rdev_sysfs_entry rdev_offset
=
2783 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2786 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2788 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2791 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2793 /* check if two start/length pairs overlap */
2801 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2803 unsigned long long blocks
;
2806 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2809 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2810 return -EINVAL
; /* sector conversion overflow */
2813 if (new != blocks
* 2)
2814 return -EINVAL
; /* unsigned long long to sector_t overflow */
2821 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2823 struct mddev
*my_mddev
= rdev
->mddev
;
2824 sector_t oldsectors
= rdev
->sectors
;
2827 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2829 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2830 if (my_mddev
->persistent
) {
2831 sectors
= super_types
[my_mddev
->major_version
].
2832 rdev_size_change(rdev
, sectors
);
2835 } else if (!sectors
)
2836 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2839 if (sectors
< my_mddev
->dev_sectors
)
2840 return -EINVAL
; /* component must fit device */
2842 rdev
->sectors
= sectors
;
2843 if (sectors
> oldsectors
&& my_mddev
->external
) {
2844 /* need to check that all other rdevs with the same ->bdev
2845 * do not overlap. We need to unlock the mddev to avoid
2846 * a deadlock. We have already changed rdev->sectors, and if
2847 * we have to change it back, we will have the lock again.
2849 struct mddev
*mddev
;
2851 struct list_head
*tmp
;
2853 mddev_unlock(my_mddev
);
2854 for_each_mddev(mddev
, tmp
) {
2855 struct md_rdev
*rdev2
;
2858 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2859 if (rdev
->bdev
== rdev2
->bdev
&&
2861 overlaps(rdev
->data_offset
, rdev
->sectors
,
2867 mddev_unlock(mddev
);
2873 mddev_lock(my_mddev
);
2875 /* Someone else could have slipped in a size
2876 * change here, but doing so is just silly.
2877 * We put oldsectors back because we *know* it is
2878 * safe, and trust userspace not to race with
2881 rdev
->sectors
= oldsectors
;
2888 static struct rdev_sysfs_entry rdev_size
=
2889 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2892 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2894 unsigned long long recovery_start
= rdev
->recovery_offset
;
2896 if (test_bit(In_sync
, &rdev
->flags
) ||
2897 recovery_start
== MaxSector
)
2898 return sprintf(page
, "none\n");
2900 return sprintf(page
, "%llu\n", recovery_start
);
2903 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2905 unsigned long long recovery_start
;
2907 if (cmd_match(buf
, "none"))
2908 recovery_start
= MaxSector
;
2909 else if (strict_strtoull(buf
, 10, &recovery_start
))
2912 if (rdev
->mddev
->pers
&&
2913 rdev
->raid_disk
>= 0)
2916 rdev
->recovery_offset
= recovery_start
;
2917 if (recovery_start
== MaxSector
)
2918 set_bit(In_sync
, &rdev
->flags
);
2920 clear_bit(In_sync
, &rdev
->flags
);
2924 static struct rdev_sysfs_entry rdev_recovery_start
=
2925 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2929 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2931 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2933 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2935 return badblocks_show(&rdev
->badblocks
, page
, 0);
2937 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2939 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2940 /* Maybe that ack was all we needed */
2941 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2942 wake_up(&rdev
->blocked_wait
);
2945 static struct rdev_sysfs_entry rdev_bad_blocks
=
2946 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2949 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2951 return badblocks_show(&rdev
->badblocks
, page
, 1);
2953 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2955 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2957 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2958 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2960 static struct attribute
*rdev_default_attrs
[] = {
2966 &rdev_recovery_start
.attr
,
2967 &rdev_bad_blocks
.attr
,
2968 &rdev_unack_bad_blocks
.attr
,
2972 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2974 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2975 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2976 struct mddev
*mddev
= rdev
->mddev
;
2982 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2984 if (rdev
->mddev
== NULL
)
2987 rv
= entry
->show(rdev
, page
);
2988 mddev_unlock(mddev
);
2994 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2995 const char *page
, size_t length
)
2997 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2998 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3000 struct mddev
*mddev
= rdev
->mddev
;
3004 if (!capable(CAP_SYS_ADMIN
))
3006 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3008 if (rdev
->mddev
== NULL
)
3011 rv
= entry
->store(rdev
, page
, length
);
3012 mddev_unlock(mddev
);
3017 static void rdev_free(struct kobject
*ko
)
3019 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3022 static const struct sysfs_ops rdev_sysfs_ops
= {
3023 .show
= rdev_attr_show
,
3024 .store
= rdev_attr_store
,
3026 static struct kobj_type rdev_ktype
= {
3027 .release
= rdev_free
,
3028 .sysfs_ops
= &rdev_sysfs_ops
,
3029 .default_attrs
= rdev_default_attrs
,
3032 int md_rdev_init(struct md_rdev
*rdev
)
3035 rdev
->saved_raid_disk
= -1;
3036 rdev
->raid_disk
= -1;
3038 rdev
->data_offset
= 0;
3039 rdev
->sb_events
= 0;
3040 rdev
->last_read_error
.tv_sec
= 0;
3041 rdev
->last_read_error
.tv_nsec
= 0;
3042 rdev
->sb_loaded
= 0;
3043 rdev
->bb_page
= NULL
;
3044 atomic_set(&rdev
->nr_pending
, 0);
3045 atomic_set(&rdev
->read_errors
, 0);
3046 atomic_set(&rdev
->corrected_errors
, 0);
3048 INIT_LIST_HEAD(&rdev
->same_set
);
3049 init_waitqueue_head(&rdev
->blocked_wait
);
3051 /* Add space to store bad block list.
3052 * This reserves the space even on arrays where it cannot
3053 * be used - I wonder if that matters
3055 rdev
->badblocks
.count
= 0;
3056 rdev
->badblocks
.shift
= 0;
3057 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3058 seqlock_init(&rdev
->badblocks
.lock
);
3059 if (rdev
->badblocks
.page
== NULL
)
3064 EXPORT_SYMBOL_GPL(md_rdev_init
);
3066 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3068 * mark the device faulty if:
3070 * - the device is nonexistent (zero size)
3071 * - the device has no valid superblock
3073 * a faulty rdev _never_ has rdev->sb set.
3075 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3077 char b
[BDEVNAME_SIZE
];
3079 struct md_rdev
*rdev
;
3082 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3084 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3085 return ERR_PTR(-ENOMEM
);
3088 err
= md_rdev_init(rdev
);
3091 err
= alloc_disk_sb(rdev
);
3095 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3099 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3101 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3104 "md: %s has zero or unknown size, marking faulty!\n",
3105 bdevname(rdev
->bdev
,b
));
3110 if (super_format
>= 0) {
3111 err
= super_types
[super_format
].
3112 load_super(rdev
, NULL
, super_minor
);
3113 if (err
== -EINVAL
) {
3115 "md: %s does not have a valid v%d.%d "
3116 "superblock, not importing!\n",
3117 bdevname(rdev
->bdev
,b
),
3118 super_format
, super_minor
);
3123 "md: could not read %s's sb, not importing!\n",
3124 bdevname(rdev
->bdev
,b
));
3128 if (super_format
== -1)
3129 /* hot-add for 0.90, or non-persistent: so no badblocks */
3130 rdev
->badblocks
.shift
= -1;
3138 kfree(rdev
->badblocks
.page
);
3140 return ERR_PTR(err
);
3144 * Check a full RAID array for plausibility
3148 static void analyze_sbs(struct mddev
* mddev
)
3151 struct md_rdev
*rdev
, *freshest
, *tmp
;
3152 char b
[BDEVNAME_SIZE
];
3155 rdev_for_each(rdev
, tmp
, mddev
)
3156 switch (super_types
[mddev
->major_version
].
3157 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3165 "md: fatal superblock inconsistency in %s"
3166 " -- removing from array\n",
3167 bdevname(rdev
->bdev
,b
));
3168 kick_rdev_from_array(rdev
);
3172 super_types
[mddev
->major_version
].
3173 validate_super(mddev
, freshest
);
3176 rdev_for_each(rdev
, tmp
, mddev
) {
3177 if (mddev
->max_disks
&&
3178 (rdev
->desc_nr
>= mddev
->max_disks
||
3179 i
> mddev
->max_disks
)) {
3181 "md: %s: %s: only %d devices permitted\n",
3182 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3184 kick_rdev_from_array(rdev
);
3187 if (rdev
!= freshest
)
3188 if (super_types
[mddev
->major_version
].
3189 validate_super(mddev
, rdev
)) {
3190 printk(KERN_WARNING
"md: kicking non-fresh %s"
3192 bdevname(rdev
->bdev
,b
));
3193 kick_rdev_from_array(rdev
);
3196 if (mddev
->level
== LEVEL_MULTIPATH
) {
3197 rdev
->desc_nr
= i
++;
3198 rdev
->raid_disk
= rdev
->desc_nr
;
3199 set_bit(In_sync
, &rdev
->flags
);
3200 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3201 rdev
->raid_disk
= -1;
3202 clear_bit(In_sync
, &rdev
->flags
);
3207 /* Read a fixed-point number.
3208 * Numbers in sysfs attributes should be in "standard" units where
3209 * possible, so time should be in seconds.
3210 * However we internally use a a much smaller unit such as
3211 * milliseconds or jiffies.
3212 * This function takes a decimal number with a possible fractional
3213 * component, and produces an integer which is the result of
3214 * multiplying that number by 10^'scale'.
3215 * all without any floating-point arithmetic.
3217 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3219 unsigned long result
= 0;
3221 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3224 else if (decimals
< scale
) {
3227 result
= result
* 10 + value
;
3239 while (decimals
< scale
) {
3248 static void md_safemode_timeout(unsigned long data
);
3251 safe_delay_show(struct mddev
*mddev
, char *page
)
3253 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3254 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3257 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3261 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3264 mddev
->safemode_delay
= 0;
3266 unsigned long old_delay
= mddev
->safemode_delay
;
3267 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3268 if (mddev
->safemode_delay
== 0)
3269 mddev
->safemode_delay
= 1;
3270 if (mddev
->safemode_delay
< old_delay
)
3271 md_safemode_timeout((unsigned long)mddev
);
3275 static struct md_sysfs_entry md_safe_delay
=
3276 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3279 level_show(struct mddev
*mddev
, char *page
)
3281 struct md_personality
*p
= mddev
->pers
;
3283 return sprintf(page
, "%s\n", p
->name
);
3284 else if (mddev
->clevel
[0])
3285 return sprintf(page
, "%s\n", mddev
->clevel
);
3286 else if (mddev
->level
!= LEVEL_NONE
)
3287 return sprintf(page
, "%d\n", mddev
->level
);
3293 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3297 struct md_personality
*pers
;
3300 struct md_rdev
*rdev
;
3302 if (mddev
->pers
== NULL
) {
3305 if (len
>= sizeof(mddev
->clevel
))
3307 strncpy(mddev
->clevel
, buf
, len
);
3308 if (mddev
->clevel
[len
-1] == '\n')
3310 mddev
->clevel
[len
] = 0;
3311 mddev
->level
= LEVEL_NONE
;
3315 /* request to change the personality. Need to ensure:
3316 * - array is not engaged in resync/recovery/reshape
3317 * - old personality can be suspended
3318 * - new personality will access other array.
3321 if (mddev
->sync_thread
||
3322 mddev
->reshape_position
!= MaxSector
||
3323 mddev
->sysfs_active
)
3326 if (!mddev
->pers
->quiesce
) {
3327 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3328 mdname(mddev
), mddev
->pers
->name
);
3332 /* Now find the new personality */
3333 if (len
== 0 || len
>= sizeof(clevel
))
3335 strncpy(clevel
, buf
, len
);
3336 if (clevel
[len
-1] == '\n')
3339 if (strict_strtol(clevel
, 10, &level
))
3342 if (request_module("md-%s", clevel
) != 0)
3343 request_module("md-level-%s", clevel
);
3344 spin_lock(&pers_lock
);
3345 pers
= find_pers(level
, clevel
);
3346 if (!pers
|| !try_module_get(pers
->owner
)) {
3347 spin_unlock(&pers_lock
);
3348 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3351 spin_unlock(&pers_lock
);
3353 if (pers
== mddev
->pers
) {
3354 /* Nothing to do! */
3355 module_put(pers
->owner
);
3358 if (!pers
->takeover
) {
3359 module_put(pers
->owner
);
3360 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3361 mdname(mddev
), clevel
);
3365 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3366 rdev
->new_raid_disk
= rdev
->raid_disk
;
3368 /* ->takeover must set new_* and/or delta_disks
3369 * if it succeeds, and may set them when it fails.
3371 priv
= pers
->takeover(mddev
);
3373 mddev
->new_level
= mddev
->level
;
3374 mddev
->new_layout
= mddev
->layout
;
3375 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3376 mddev
->raid_disks
-= mddev
->delta_disks
;
3377 mddev
->delta_disks
= 0;
3378 module_put(pers
->owner
);
3379 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3380 mdname(mddev
), clevel
);
3381 return PTR_ERR(priv
);
3384 /* Looks like we have a winner */
3385 mddev_suspend(mddev
);
3386 mddev
->pers
->stop(mddev
);
3388 if (mddev
->pers
->sync_request
== NULL
&&
3389 pers
->sync_request
!= NULL
) {
3390 /* need to add the md_redundancy_group */
3391 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3393 "md: cannot register extra attributes for %s\n",
3395 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3397 if (mddev
->pers
->sync_request
!= NULL
&&
3398 pers
->sync_request
== NULL
) {
3399 /* need to remove the md_redundancy_group */
3400 if (mddev
->to_remove
== NULL
)
3401 mddev
->to_remove
= &md_redundancy_group
;
3404 if (mddev
->pers
->sync_request
== NULL
&&
3406 /* We are converting from a no-redundancy array
3407 * to a redundancy array and metadata is managed
3408 * externally so we need to be sure that writes
3409 * won't block due to a need to transition
3411 * until external management is started.
3414 mddev
->safemode_delay
= 0;
3415 mddev
->safemode
= 0;
3418 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3419 if (rdev
->raid_disk
< 0)
3421 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3422 rdev
->new_raid_disk
= -1;
3423 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3425 sysfs_unlink_rdev(mddev
, rdev
);
3427 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3428 if (rdev
->raid_disk
< 0)
3430 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3432 rdev
->raid_disk
= rdev
->new_raid_disk
;
3433 if (rdev
->raid_disk
< 0)
3434 clear_bit(In_sync
, &rdev
->flags
);
3436 if (sysfs_link_rdev(mddev
, rdev
))
3437 printk(KERN_WARNING
"md: cannot register rd%d"
3438 " for %s after level change\n",
3439 rdev
->raid_disk
, mdname(mddev
));
3443 module_put(mddev
->pers
->owner
);
3445 mddev
->private = priv
;
3446 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3447 mddev
->level
= mddev
->new_level
;
3448 mddev
->layout
= mddev
->new_layout
;
3449 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3450 mddev
->delta_disks
= 0;
3451 mddev
->degraded
= 0;
3452 if (mddev
->pers
->sync_request
== NULL
) {
3453 /* this is now an array without redundancy, so
3454 * it must always be in_sync
3457 del_timer_sync(&mddev
->safemode_timer
);
3460 mddev_resume(mddev
);
3461 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3462 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3463 md_wakeup_thread(mddev
->thread
);
3464 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3465 md_new_event(mddev
);
3469 static struct md_sysfs_entry md_level
=
3470 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3474 layout_show(struct mddev
*mddev
, char *page
)
3476 /* just a number, not meaningful for all levels */
3477 if (mddev
->reshape_position
!= MaxSector
&&
3478 mddev
->layout
!= mddev
->new_layout
)
3479 return sprintf(page
, "%d (%d)\n",
3480 mddev
->new_layout
, mddev
->layout
);
3481 return sprintf(page
, "%d\n", mddev
->layout
);
3485 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3488 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3490 if (!*buf
|| (*e
&& *e
!= '\n'))
3495 if (mddev
->pers
->check_reshape
== NULL
)
3497 mddev
->new_layout
= n
;
3498 err
= mddev
->pers
->check_reshape(mddev
);
3500 mddev
->new_layout
= mddev
->layout
;
3504 mddev
->new_layout
= n
;
3505 if (mddev
->reshape_position
== MaxSector
)
3510 static struct md_sysfs_entry md_layout
=
3511 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3515 raid_disks_show(struct mddev
*mddev
, char *page
)
3517 if (mddev
->raid_disks
== 0)
3519 if (mddev
->reshape_position
!= MaxSector
&&
3520 mddev
->delta_disks
!= 0)
3521 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3522 mddev
->raid_disks
- mddev
->delta_disks
);
3523 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3526 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3529 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3533 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3535 if (!*buf
|| (*e
&& *e
!= '\n'))
3539 rv
= update_raid_disks(mddev
, n
);
3540 else if (mddev
->reshape_position
!= MaxSector
) {
3541 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3542 mddev
->delta_disks
= n
- olddisks
;
3543 mddev
->raid_disks
= n
;
3545 mddev
->raid_disks
= n
;
3546 return rv
? rv
: len
;
3548 static struct md_sysfs_entry md_raid_disks
=
3549 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3552 chunk_size_show(struct mddev
*mddev
, char *page
)
3554 if (mddev
->reshape_position
!= MaxSector
&&
3555 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3556 return sprintf(page
, "%d (%d)\n",
3557 mddev
->new_chunk_sectors
<< 9,
3558 mddev
->chunk_sectors
<< 9);
3559 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3563 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3566 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3568 if (!*buf
|| (*e
&& *e
!= '\n'))
3573 if (mddev
->pers
->check_reshape
== NULL
)
3575 mddev
->new_chunk_sectors
= n
>> 9;
3576 err
= mddev
->pers
->check_reshape(mddev
);
3578 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3582 mddev
->new_chunk_sectors
= n
>> 9;
3583 if (mddev
->reshape_position
== MaxSector
)
3584 mddev
->chunk_sectors
= n
>> 9;
3588 static struct md_sysfs_entry md_chunk_size
=
3589 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3592 resync_start_show(struct mddev
*mddev
, char *page
)
3594 if (mddev
->recovery_cp
== MaxSector
)
3595 return sprintf(page
, "none\n");
3596 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3600 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3603 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3605 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3607 if (cmd_match(buf
, "none"))
3609 else if (!*buf
|| (*e
&& *e
!= '\n'))
3612 mddev
->recovery_cp
= n
;
3615 static struct md_sysfs_entry md_resync_start
=
3616 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3619 * The array state can be:
3622 * No devices, no size, no level
3623 * Equivalent to STOP_ARRAY ioctl
3625 * May have some settings, but array is not active
3626 * all IO results in error
3627 * When written, doesn't tear down array, but just stops it
3628 * suspended (not supported yet)
3629 * All IO requests will block. The array can be reconfigured.
3630 * Writing this, if accepted, will block until array is quiescent
3632 * no resync can happen. no superblocks get written.
3633 * write requests fail
3635 * like readonly, but behaves like 'clean' on a write request.
3637 * clean - no pending writes, but otherwise active.
3638 * When written to inactive array, starts without resync
3639 * If a write request arrives then
3640 * if metadata is known, mark 'dirty' and switch to 'active'.
3641 * if not known, block and switch to write-pending
3642 * If written to an active array that has pending writes, then fails.
3644 * fully active: IO and resync can be happening.
3645 * When written to inactive array, starts with resync
3648 * clean, but writes are blocked waiting for 'active' to be written.
3651 * like active, but no writes have been seen for a while (100msec).
3654 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3655 write_pending
, active_idle
, bad_word
};
3656 static char *array_states
[] = {
3657 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3658 "write-pending", "active-idle", NULL
};
3660 static int match_word(const char *word
, char **list
)
3663 for (n
=0; list
[n
]; n
++)
3664 if (cmd_match(word
, list
[n
]))
3670 array_state_show(struct mddev
*mddev
, char *page
)
3672 enum array_state st
= inactive
;
3685 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3687 else if (mddev
->safemode
)
3693 if (list_empty(&mddev
->disks
) &&
3694 mddev
->raid_disks
== 0 &&
3695 mddev
->dev_sectors
== 0)
3700 return sprintf(page
, "%s\n", array_states
[st
]);
3703 static int do_md_stop(struct mddev
* mddev
, int ro
, int is_open
);
3704 static int md_set_readonly(struct mddev
* mddev
, int is_open
);
3705 static int do_md_run(struct mddev
* mddev
);
3706 static int restart_array(struct mddev
*mddev
);
3709 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3712 enum array_state st
= match_word(buf
, array_states
);
3717 /* stopping an active array */
3718 if (atomic_read(&mddev
->openers
) > 0)
3720 err
= do_md_stop(mddev
, 0, 0);
3723 /* stopping an active array */
3725 if (atomic_read(&mddev
->openers
) > 0)
3727 err
= do_md_stop(mddev
, 2, 0);
3729 err
= 0; /* already inactive */
3732 break; /* not supported yet */
3735 err
= md_set_readonly(mddev
, 0);
3738 set_disk_ro(mddev
->gendisk
, 1);
3739 err
= do_md_run(mddev
);
3745 err
= md_set_readonly(mddev
, 0);
3746 else if (mddev
->ro
== 1)
3747 err
= restart_array(mddev
);
3750 set_disk_ro(mddev
->gendisk
, 0);
3754 err
= do_md_run(mddev
);
3759 restart_array(mddev
);
3760 spin_lock_irq(&mddev
->write_lock
);
3761 if (atomic_read(&mddev
->writes_pending
) == 0) {
3762 if (mddev
->in_sync
== 0) {
3764 if (mddev
->safemode
== 1)
3765 mddev
->safemode
= 0;
3766 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3771 spin_unlock_irq(&mddev
->write_lock
);
3777 restart_array(mddev
);
3778 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3779 wake_up(&mddev
->sb_wait
);
3783 set_disk_ro(mddev
->gendisk
, 0);
3784 err
= do_md_run(mddev
);
3789 /* these cannot be set */
3795 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3799 static struct md_sysfs_entry md_array_state
=
3800 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3803 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3804 return sprintf(page
, "%d\n",
3805 atomic_read(&mddev
->max_corr_read_errors
));
3809 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3812 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3814 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3815 atomic_set(&mddev
->max_corr_read_errors
, n
);
3821 static struct md_sysfs_entry max_corr_read_errors
=
3822 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3823 max_corrected_read_errors_store
);
3826 null_show(struct mddev
*mddev
, char *page
)
3832 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3834 /* buf must be %d:%d\n? giving major and minor numbers */
3835 /* The new device is added to the array.
3836 * If the array has a persistent superblock, we read the
3837 * superblock to initialise info and check validity.
3838 * Otherwise, only checking done is that in bind_rdev_to_array,
3839 * which mainly checks size.
3842 int major
= simple_strtoul(buf
, &e
, 10);
3845 struct md_rdev
*rdev
;
3848 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3850 minor
= simple_strtoul(e
+1, &e
, 10);
3851 if (*e
&& *e
!= '\n')
3853 dev
= MKDEV(major
, minor
);
3854 if (major
!= MAJOR(dev
) ||
3855 minor
!= MINOR(dev
))
3859 if (mddev
->persistent
) {
3860 rdev
= md_import_device(dev
, mddev
->major_version
,
3861 mddev
->minor_version
);
3862 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3863 struct md_rdev
*rdev0
3864 = list_entry(mddev
->disks
.next
,
3865 struct md_rdev
, same_set
);
3866 err
= super_types
[mddev
->major_version
]
3867 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3871 } else if (mddev
->external
)
3872 rdev
= md_import_device(dev
, -2, -1);
3874 rdev
= md_import_device(dev
, -1, -1);
3877 return PTR_ERR(rdev
);
3878 err
= bind_rdev_to_array(rdev
, mddev
);
3882 return err
? err
: len
;
3885 static struct md_sysfs_entry md_new_device
=
3886 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3889 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3892 unsigned long chunk
, end_chunk
;
3896 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3898 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3899 if (buf
== end
) break;
3900 if (*end
== '-') { /* range */
3902 end_chunk
= simple_strtoul(buf
, &end
, 0);
3903 if (buf
== end
) break;
3905 if (*end
&& !isspace(*end
)) break;
3906 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3907 buf
= skip_spaces(end
);
3909 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3914 static struct md_sysfs_entry md_bitmap
=
3915 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3918 size_show(struct mddev
*mddev
, char *page
)
3920 return sprintf(page
, "%llu\n",
3921 (unsigned long long)mddev
->dev_sectors
/ 2);
3924 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
3927 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3929 /* If array is inactive, we can reduce the component size, but
3930 * not increase it (except from 0).
3931 * If array is active, we can try an on-line resize
3934 int err
= strict_blocks_to_sectors(buf
, §ors
);
3939 err
= update_size(mddev
, sectors
);
3940 md_update_sb(mddev
, 1);
3942 if (mddev
->dev_sectors
== 0 ||
3943 mddev
->dev_sectors
> sectors
)
3944 mddev
->dev_sectors
= sectors
;
3948 return err
? err
: len
;
3951 static struct md_sysfs_entry md_size
=
3952 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3957 * 'none' for arrays with no metadata (good luck...)
3958 * 'external' for arrays with externally managed metadata,
3959 * or N.M for internally known formats
3962 metadata_show(struct mddev
*mddev
, char *page
)
3964 if (mddev
->persistent
)
3965 return sprintf(page
, "%d.%d\n",
3966 mddev
->major_version
, mddev
->minor_version
);
3967 else if (mddev
->external
)
3968 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3970 return sprintf(page
, "none\n");
3974 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3978 /* Changing the details of 'external' metadata is
3979 * always permitted. Otherwise there must be
3980 * no devices attached to the array.
3982 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3984 else if (!list_empty(&mddev
->disks
))
3987 if (cmd_match(buf
, "none")) {
3988 mddev
->persistent
= 0;
3989 mddev
->external
= 0;
3990 mddev
->major_version
= 0;
3991 mddev
->minor_version
= 90;
3994 if (strncmp(buf
, "external:", 9) == 0) {
3995 size_t namelen
= len
-9;
3996 if (namelen
>= sizeof(mddev
->metadata_type
))
3997 namelen
= sizeof(mddev
->metadata_type
)-1;
3998 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3999 mddev
->metadata_type
[namelen
] = 0;
4000 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4001 mddev
->metadata_type
[--namelen
] = 0;
4002 mddev
->persistent
= 0;
4003 mddev
->external
= 1;
4004 mddev
->major_version
= 0;
4005 mddev
->minor_version
= 90;
4008 major
= simple_strtoul(buf
, &e
, 10);
4009 if (e
==buf
|| *e
!= '.')
4012 minor
= simple_strtoul(buf
, &e
, 10);
4013 if (e
==buf
|| (*e
&& *e
!= '\n') )
4015 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4017 mddev
->major_version
= major
;
4018 mddev
->minor_version
= minor
;
4019 mddev
->persistent
= 1;
4020 mddev
->external
= 0;
4024 static struct md_sysfs_entry md_metadata
=
4025 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4028 action_show(struct mddev
*mddev
, char *page
)
4030 char *type
= "idle";
4031 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4033 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4034 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4035 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4037 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4038 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4040 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4044 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4047 return sprintf(page
, "%s\n", type
);
4050 static void reap_sync_thread(struct mddev
*mddev
);
4053 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4055 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4058 if (cmd_match(page
, "frozen"))
4059 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4061 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4063 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4064 if (mddev
->sync_thread
) {
4065 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4066 reap_sync_thread(mddev
);
4068 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4069 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4071 else if (cmd_match(page
, "resync"))
4072 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4073 else if (cmd_match(page
, "recover")) {
4074 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4075 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4076 } else if (cmd_match(page
, "reshape")) {
4078 if (mddev
->pers
->start_reshape
== NULL
)
4080 err
= mddev
->pers
->start_reshape(mddev
);
4083 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4085 if (cmd_match(page
, "check"))
4086 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4087 else if (!cmd_match(page
, "repair"))
4089 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4090 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4092 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4093 md_wakeup_thread(mddev
->thread
);
4094 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4099 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4101 return sprintf(page
, "%llu\n",
4102 (unsigned long long) mddev
->resync_mismatches
);
4105 static struct md_sysfs_entry md_scan_mode
=
4106 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4109 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4112 sync_min_show(struct mddev
*mddev
, char *page
)
4114 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4115 mddev
->sync_speed_min
? "local": "system");
4119 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4123 if (strncmp(buf
, "system", 6)==0) {
4124 mddev
->sync_speed_min
= 0;
4127 min
= simple_strtoul(buf
, &e
, 10);
4128 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4130 mddev
->sync_speed_min
= min
;
4134 static struct md_sysfs_entry md_sync_min
=
4135 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4138 sync_max_show(struct mddev
*mddev
, char *page
)
4140 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4141 mddev
->sync_speed_max
? "local": "system");
4145 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4149 if (strncmp(buf
, "system", 6)==0) {
4150 mddev
->sync_speed_max
= 0;
4153 max
= simple_strtoul(buf
, &e
, 10);
4154 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4156 mddev
->sync_speed_max
= max
;
4160 static struct md_sysfs_entry md_sync_max
=
4161 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4164 degraded_show(struct mddev
*mddev
, char *page
)
4166 return sprintf(page
, "%d\n", mddev
->degraded
);
4168 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4171 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4173 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4177 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4181 if (strict_strtol(buf
, 10, &n
))
4184 if (n
!= 0 && n
!= 1)
4187 mddev
->parallel_resync
= n
;
4189 if (mddev
->sync_thread
)
4190 wake_up(&resync_wait
);
4195 /* force parallel resync, even with shared block devices */
4196 static struct md_sysfs_entry md_sync_force_parallel
=
4197 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4198 sync_force_parallel_show
, sync_force_parallel_store
);
4201 sync_speed_show(struct mddev
*mddev
, char *page
)
4203 unsigned long resync
, dt
, db
;
4204 if (mddev
->curr_resync
== 0)
4205 return sprintf(page
, "none\n");
4206 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4207 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4209 db
= resync
- mddev
->resync_mark_cnt
;
4210 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4213 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4216 sync_completed_show(struct mddev
*mddev
, char *page
)
4218 unsigned long long max_sectors
, resync
;
4220 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4221 return sprintf(page
, "none\n");
4223 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4224 max_sectors
= mddev
->resync_max_sectors
;
4226 max_sectors
= mddev
->dev_sectors
;
4228 resync
= mddev
->curr_resync_completed
;
4229 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4232 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4235 min_sync_show(struct mddev
*mddev
, char *page
)
4237 return sprintf(page
, "%llu\n",
4238 (unsigned long long)mddev
->resync_min
);
4241 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4243 unsigned long long min
;
4244 if (strict_strtoull(buf
, 10, &min
))
4246 if (min
> mddev
->resync_max
)
4248 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4251 /* Must be a multiple of chunk_size */
4252 if (mddev
->chunk_sectors
) {
4253 sector_t temp
= min
;
4254 if (sector_div(temp
, mddev
->chunk_sectors
))
4257 mddev
->resync_min
= min
;
4262 static struct md_sysfs_entry md_min_sync
=
4263 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4266 max_sync_show(struct mddev
*mddev
, char *page
)
4268 if (mddev
->resync_max
== MaxSector
)
4269 return sprintf(page
, "max\n");
4271 return sprintf(page
, "%llu\n",
4272 (unsigned long long)mddev
->resync_max
);
4275 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4277 if (strncmp(buf
, "max", 3) == 0)
4278 mddev
->resync_max
= MaxSector
;
4280 unsigned long long max
;
4281 if (strict_strtoull(buf
, 10, &max
))
4283 if (max
< mddev
->resync_min
)
4285 if (max
< mddev
->resync_max
&&
4287 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4290 /* Must be a multiple of chunk_size */
4291 if (mddev
->chunk_sectors
) {
4292 sector_t temp
= max
;
4293 if (sector_div(temp
, mddev
->chunk_sectors
))
4296 mddev
->resync_max
= max
;
4298 wake_up(&mddev
->recovery_wait
);
4302 static struct md_sysfs_entry md_max_sync
=
4303 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4306 suspend_lo_show(struct mddev
*mddev
, char *page
)
4308 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4312 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4315 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4316 unsigned long long old
= mddev
->suspend_lo
;
4318 if (mddev
->pers
== NULL
||
4319 mddev
->pers
->quiesce
== NULL
)
4321 if (buf
== e
|| (*e
&& *e
!= '\n'))
4324 mddev
->suspend_lo
= new;
4326 /* Shrinking suspended region */
4327 mddev
->pers
->quiesce(mddev
, 2);
4329 /* Expanding suspended region - need to wait */
4330 mddev
->pers
->quiesce(mddev
, 1);
4331 mddev
->pers
->quiesce(mddev
, 0);
4335 static struct md_sysfs_entry md_suspend_lo
=
4336 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4340 suspend_hi_show(struct mddev
*mddev
, char *page
)
4342 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4346 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4349 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4350 unsigned long long old
= mddev
->suspend_hi
;
4352 if (mddev
->pers
== NULL
||
4353 mddev
->pers
->quiesce
== NULL
)
4355 if (buf
== e
|| (*e
&& *e
!= '\n'))
4358 mddev
->suspend_hi
= new;
4360 /* Shrinking suspended region */
4361 mddev
->pers
->quiesce(mddev
, 2);
4363 /* Expanding suspended region - need to wait */
4364 mddev
->pers
->quiesce(mddev
, 1);
4365 mddev
->pers
->quiesce(mddev
, 0);
4369 static struct md_sysfs_entry md_suspend_hi
=
4370 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4373 reshape_position_show(struct mddev
*mddev
, char *page
)
4375 if (mddev
->reshape_position
!= MaxSector
)
4376 return sprintf(page
, "%llu\n",
4377 (unsigned long long)mddev
->reshape_position
);
4378 strcpy(page
, "none\n");
4383 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4386 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4389 if (buf
== e
|| (*e
&& *e
!= '\n'))
4391 mddev
->reshape_position
= new;
4392 mddev
->delta_disks
= 0;
4393 mddev
->new_level
= mddev
->level
;
4394 mddev
->new_layout
= mddev
->layout
;
4395 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4399 static struct md_sysfs_entry md_reshape_position
=
4400 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4401 reshape_position_store
);
4404 array_size_show(struct mddev
*mddev
, char *page
)
4406 if (mddev
->external_size
)
4407 return sprintf(page
, "%llu\n",
4408 (unsigned long long)mddev
->array_sectors
/2);
4410 return sprintf(page
, "default\n");
4414 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4418 if (strncmp(buf
, "default", 7) == 0) {
4420 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4422 sectors
= mddev
->array_sectors
;
4424 mddev
->external_size
= 0;
4426 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4428 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4431 mddev
->external_size
= 1;
4434 mddev
->array_sectors
= sectors
;
4436 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4437 revalidate_disk(mddev
->gendisk
);
4442 static struct md_sysfs_entry md_array_size
=
4443 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4446 static struct attribute
*md_default_attrs
[] = {
4449 &md_raid_disks
.attr
,
4450 &md_chunk_size
.attr
,
4452 &md_resync_start
.attr
,
4454 &md_new_device
.attr
,
4455 &md_safe_delay
.attr
,
4456 &md_array_state
.attr
,
4457 &md_reshape_position
.attr
,
4458 &md_array_size
.attr
,
4459 &max_corr_read_errors
.attr
,
4463 static struct attribute
*md_redundancy_attrs
[] = {
4465 &md_mismatches
.attr
,
4468 &md_sync_speed
.attr
,
4469 &md_sync_force_parallel
.attr
,
4470 &md_sync_completed
.attr
,
4473 &md_suspend_lo
.attr
,
4474 &md_suspend_hi
.attr
,
4479 static struct attribute_group md_redundancy_group
= {
4481 .attrs
= md_redundancy_attrs
,
4486 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4488 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4489 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4494 rv
= mddev_lock(mddev
);
4496 rv
= entry
->show(mddev
, page
);
4497 mddev_unlock(mddev
);
4503 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4504 const char *page
, size_t length
)
4506 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4507 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4512 if (!capable(CAP_SYS_ADMIN
))
4514 rv
= mddev_lock(mddev
);
4515 if (mddev
->hold_active
== UNTIL_IOCTL
)
4516 mddev
->hold_active
= 0;
4518 rv
= entry
->store(mddev
, page
, length
);
4519 mddev_unlock(mddev
);
4524 static void md_free(struct kobject
*ko
)
4526 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4528 if (mddev
->sysfs_state
)
4529 sysfs_put(mddev
->sysfs_state
);
4531 if (mddev
->gendisk
) {
4532 del_gendisk(mddev
->gendisk
);
4533 put_disk(mddev
->gendisk
);
4536 blk_cleanup_queue(mddev
->queue
);
4541 static const struct sysfs_ops md_sysfs_ops
= {
4542 .show
= md_attr_show
,
4543 .store
= md_attr_store
,
4545 static struct kobj_type md_ktype
= {
4547 .sysfs_ops
= &md_sysfs_ops
,
4548 .default_attrs
= md_default_attrs
,
4553 static void mddev_delayed_delete(struct work_struct
*ws
)
4555 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4557 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4558 kobject_del(&mddev
->kobj
);
4559 kobject_put(&mddev
->kobj
);
4562 static int md_alloc(dev_t dev
, char *name
)
4564 static DEFINE_MUTEX(disks_mutex
);
4565 struct mddev
*mddev
= mddev_find(dev
);
4566 struct gendisk
*disk
;
4575 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4576 shift
= partitioned
? MdpMinorShift
: 0;
4577 unit
= MINOR(mddev
->unit
) >> shift
;
4579 /* wait for any previous instance of this device to be
4580 * completely removed (mddev_delayed_delete).
4582 flush_workqueue(md_misc_wq
);
4584 mutex_lock(&disks_mutex
);
4590 /* Need to ensure that 'name' is not a duplicate.
4592 struct mddev
*mddev2
;
4593 spin_lock(&all_mddevs_lock
);
4595 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4596 if (mddev2
->gendisk
&&
4597 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4598 spin_unlock(&all_mddevs_lock
);
4601 spin_unlock(&all_mddevs_lock
);
4605 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4608 mddev
->queue
->queuedata
= mddev
;
4610 blk_queue_make_request(mddev
->queue
, md_make_request
);
4612 disk
= alloc_disk(1 << shift
);
4614 blk_cleanup_queue(mddev
->queue
);
4615 mddev
->queue
= NULL
;
4618 disk
->major
= MAJOR(mddev
->unit
);
4619 disk
->first_minor
= unit
<< shift
;
4621 strcpy(disk
->disk_name
, name
);
4622 else if (partitioned
)
4623 sprintf(disk
->disk_name
, "md_d%d", unit
);
4625 sprintf(disk
->disk_name
, "md%d", unit
);
4626 disk
->fops
= &md_fops
;
4627 disk
->private_data
= mddev
;
4628 disk
->queue
= mddev
->queue
;
4629 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4630 /* Allow extended partitions. This makes the
4631 * 'mdp' device redundant, but we can't really
4634 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4635 mddev
->gendisk
= disk
;
4636 /* As soon as we call add_disk(), another thread could get
4637 * through to md_open, so make sure it doesn't get too far
4639 mutex_lock(&mddev
->open_mutex
);
4642 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4643 &disk_to_dev(disk
)->kobj
, "%s", "md");
4645 /* This isn't possible, but as kobject_init_and_add is marked
4646 * __must_check, we must do something with the result
4648 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4652 if (mddev
->kobj
.sd
&&
4653 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4654 printk(KERN_DEBUG
"pointless warning\n");
4655 mutex_unlock(&mddev
->open_mutex
);
4657 mutex_unlock(&disks_mutex
);
4658 if (!error
&& mddev
->kobj
.sd
) {
4659 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4660 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4666 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4668 md_alloc(dev
, NULL
);
4672 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4674 /* val must be "md_*" where * is not all digits.
4675 * We allocate an array with a large free minor number, and
4676 * set the name to val. val must not already be an active name.
4678 int len
= strlen(val
);
4679 char buf
[DISK_NAME_LEN
];
4681 while (len
&& val
[len
-1] == '\n')
4683 if (len
>= DISK_NAME_LEN
)
4685 strlcpy(buf
, val
, len
+1);
4686 if (strncmp(buf
, "md_", 3) != 0)
4688 return md_alloc(0, buf
);
4691 static void md_safemode_timeout(unsigned long data
)
4693 struct mddev
*mddev
= (struct mddev
*) data
;
4695 if (!atomic_read(&mddev
->writes_pending
)) {
4696 mddev
->safemode
= 1;
4697 if (mddev
->external
)
4698 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4700 md_wakeup_thread(mddev
->thread
);
4703 static int start_dirty_degraded
;
4705 int md_run(struct mddev
*mddev
)
4708 struct md_rdev
*rdev
;
4709 struct md_personality
*pers
;
4711 if (list_empty(&mddev
->disks
))
4712 /* cannot run an array with no devices.. */
4717 /* Cannot run until previous stop completes properly */
4718 if (mddev
->sysfs_active
)
4722 * Analyze all RAID superblock(s)
4724 if (!mddev
->raid_disks
) {
4725 if (!mddev
->persistent
)
4730 if (mddev
->level
!= LEVEL_NONE
)
4731 request_module("md-level-%d", mddev
->level
);
4732 else if (mddev
->clevel
[0])
4733 request_module("md-%s", mddev
->clevel
);
4736 * Drop all container device buffers, from now on
4737 * the only valid external interface is through the md
4740 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4741 if (test_bit(Faulty
, &rdev
->flags
))
4743 sync_blockdev(rdev
->bdev
);
4744 invalidate_bdev(rdev
->bdev
);
4746 /* perform some consistency tests on the device.
4747 * We don't want the data to overlap the metadata,
4748 * Internal Bitmap issues have been handled elsewhere.
4750 if (rdev
->meta_bdev
) {
4751 /* Nothing to check */;
4752 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4753 if (mddev
->dev_sectors
&&
4754 rdev
->data_offset
+ mddev
->dev_sectors
4756 printk("md: %s: data overlaps metadata\n",
4761 if (rdev
->sb_start
+ rdev
->sb_size
/512
4762 > rdev
->data_offset
) {
4763 printk("md: %s: metadata overlaps data\n",
4768 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4771 if (mddev
->bio_set
== NULL
)
4772 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
,
4773 sizeof(struct mddev
*));
4775 spin_lock(&pers_lock
);
4776 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4777 if (!pers
|| !try_module_get(pers
->owner
)) {
4778 spin_unlock(&pers_lock
);
4779 if (mddev
->level
!= LEVEL_NONE
)
4780 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4783 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4788 spin_unlock(&pers_lock
);
4789 if (mddev
->level
!= pers
->level
) {
4790 mddev
->level
= pers
->level
;
4791 mddev
->new_level
= pers
->level
;
4793 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4795 if (mddev
->reshape_position
!= MaxSector
&&
4796 pers
->start_reshape
== NULL
) {
4797 /* This personality cannot handle reshaping... */
4799 module_put(pers
->owner
);
4803 if (pers
->sync_request
) {
4804 /* Warn if this is a potentially silly
4807 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4808 struct md_rdev
*rdev2
;
4811 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4812 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4814 rdev
->bdev
->bd_contains
==
4815 rdev2
->bdev
->bd_contains
) {
4817 "%s: WARNING: %s appears to be"
4818 " on the same physical disk as"
4821 bdevname(rdev
->bdev
,b
),
4822 bdevname(rdev2
->bdev
,b2
));
4829 "True protection against single-disk"
4830 " failure might be compromised.\n");
4833 mddev
->recovery
= 0;
4834 /* may be over-ridden by personality */
4835 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4837 mddev
->ok_start_degraded
= start_dirty_degraded
;
4839 if (start_readonly
&& mddev
->ro
== 0)
4840 mddev
->ro
= 2; /* read-only, but switch on first write */
4842 err
= mddev
->pers
->run(mddev
);
4844 printk(KERN_ERR
"md: pers->run() failed ...\n");
4845 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4846 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4847 " but 'external_size' not in effect?\n", __func__
);
4849 "md: invalid array_size %llu > default size %llu\n",
4850 (unsigned long long)mddev
->array_sectors
/ 2,
4851 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4853 mddev
->pers
->stop(mddev
);
4855 if (err
== 0 && mddev
->pers
->sync_request
) {
4856 err
= bitmap_create(mddev
);
4858 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4859 mdname(mddev
), err
);
4860 mddev
->pers
->stop(mddev
);
4864 module_put(mddev
->pers
->owner
);
4866 bitmap_destroy(mddev
);
4869 if (mddev
->pers
->sync_request
) {
4870 if (mddev
->kobj
.sd
&&
4871 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4873 "md: cannot register extra attributes for %s\n",
4875 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4876 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4879 atomic_set(&mddev
->writes_pending
,0);
4880 atomic_set(&mddev
->max_corr_read_errors
,
4881 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4882 mddev
->safemode
= 0;
4883 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4884 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4885 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4889 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4890 if (rdev
->raid_disk
>= 0)
4891 if (sysfs_link_rdev(mddev
, rdev
))
4892 /* failure here is OK */;
4894 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4897 md_update_sb(mddev
, 0);
4899 md_new_event(mddev
);
4900 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4901 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4902 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4905 EXPORT_SYMBOL_GPL(md_run
);
4907 static int do_md_run(struct mddev
*mddev
)
4911 err
= md_run(mddev
);
4914 err
= bitmap_load(mddev
);
4916 bitmap_destroy(mddev
);
4920 md_wakeup_thread(mddev
->thread
);
4921 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4923 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4924 revalidate_disk(mddev
->gendisk
);
4926 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4931 static int restart_array(struct mddev
*mddev
)
4933 struct gendisk
*disk
= mddev
->gendisk
;
4935 /* Complain if it has no devices */
4936 if (list_empty(&mddev
->disks
))
4942 mddev
->safemode
= 0;
4944 set_disk_ro(disk
, 0);
4945 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4947 /* Kick recovery or resync if necessary */
4948 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4949 md_wakeup_thread(mddev
->thread
);
4950 md_wakeup_thread(mddev
->sync_thread
);
4951 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4955 /* similar to deny_write_access, but accounts for our holding a reference
4956 * to the file ourselves */
4957 static int deny_bitmap_write_access(struct file
* file
)
4959 struct inode
*inode
= file
->f_mapping
->host
;
4961 spin_lock(&inode
->i_lock
);
4962 if (atomic_read(&inode
->i_writecount
) > 1) {
4963 spin_unlock(&inode
->i_lock
);
4966 atomic_set(&inode
->i_writecount
, -1);
4967 spin_unlock(&inode
->i_lock
);
4972 void restore_bitmap_write_access(struct file
*file
)
4974 struct inode
*inode
= file
->f_mapping
->host
;
4976 spin_lock(&inode
->i_lock
);
4977 atomic_set(&inode
->i_writecount
, 1);
4978 spin_unlock(&inode
->i_lock
);
4981 static void md_clean(struct mddev
*mddev
)
4983 mddev
->array_sectors
= 0;
4984 mddev
->external_size
= 0;
4985 mddev
->dev_sectors
= 0;
4986 mddev
->raid_disks
= 0;
4987 mddev
->recovery_cp
= 0;
4988 mddev
->resync_min
= 0;
4989 mddev
->resync_max
= MaxSector
;
4990 mddev
->reshape_position
= MaxSector
;
4991 mddev
->external
= 0;
4992 mddev
->persistent
= 0;
4993 mddev
->level
= LEVEL_NONE
;
4994 mddev
->clevel
[0] = 0;
4997 mddev
->metadata_type
[0] = 0;
4998 mddev
->chunk_sectors
= 0;
4999 mddev
->ctime
= mddev
->utime
= 0;
5001 mddev
->max_disks
= 0;
5003 mddev
->can_decrease_events
= 0;
5004 mddev
->delta_disks
= 0;
5005 mddev
->new_level
= LEVEL_NONE
;
5006 mddev
->new_layout
= 0;
5007 mddev
->new_chunk_sectors
= 0;
5008 mddev
->curr_resync
= 0;
5009 mddev
->resync_mismatches
= 0;
5010 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5011 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5012 mddev
->recovery
= 0;
5015 mddev
->degraded
= 0;
5016 mddev
->safemode
= 0;
5017 mddev
->bitmap_info
.offset
= 0;
5018 mddev
->bitmap_info
.default_offset
= 0;
5019 mddev
->bitmap_info
.chunksize
= 0;
5020 mddev
->bitmap_info
.daemon_sleep
= 0;
5021 mddev
->bitmap_info
.max_write_behind
= 0;
5024 static void __md_stop_writes(struct mddev
*mddev
)
5026 if (mddev
->sync_thread
) {
5027 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5028 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5029 reap_sync_thread(mddev
);
5032 del_timer_sync(&mddev
->safemode_timer
);
5034 bitmap_flush(mddev
);
5035 md_super_wait(mddev
);
5037 if (!mddev
->in_sync
|| mddev
->flags
) {
5038 /* mark array as shutdown cleanly */
5040 md_update_sb(mddev
, 1);
5044 void md_stop_writes(struct mddev
*mddev
)
5047 __md_stop_writes(mddev
);
5048 mddev_unlock(mddev
);
5050 EXPORT_SYMBOL_GPL(md_stop_writes
);
5052 void md_stop(struct mddev
*mddev
)
5055 mddev
->pers
->stop(mddev
);
5056 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5057 mddev
->to_remove
= &md_redundancy_group
;
5058 module_put(mddev
->pers
->owner
);
5060 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5062 EXPORT_SYMBOL_GPL(md_stop
);
5064 static int md_set_readonly(struct mddev
*mddev
, int is_open
)
5067 mutex_lock(&mddev
->open_mutex
);
5068 if (atomic_read(&mddev
->openers
) > is_open
) {
5069 printk("md: %s still in use.\n",mdname(mddev
));
5074 __md_stop_writes(mddev
);
5080 set_disk_ro(mddev
->gendisk
, 1);
5081 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5082 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5086 mutex_unlock(&mddev
->open_mutex
);
5091 * 0 - completely stop and dis-assemble array
5092 * 2 - stop but do not disassemble array
5094 static int do_md_stop(struct mddev
* mddev
, int mode
, int is_open
)
5096 struct gendisk
*disk
= mddev
->gendisk
;
5097 struct md_rdev
*rdev
;
5099 mutex_lock(&mddev
->open_mutex
);
5100 if (atomic_read(&mddev
->openers
) > is_open
||
5101 mddev
->sysfs_active
) {
5102 printk("md: %s still in use.\n",mdname(mddev
));
5103 mutex_unlock(&mddev
->open_mutex
);
5109 set_disk_ro(disk
, 0);
5111 __md_stop_writes(mddev
);
5113 mddev
->queue
->merge_bvec_fn
= NULL
;
5114 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5116 /* tell userspace to handle 'inactive' */
5117 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5119 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
5120 if (rdev
->raid_disk
>= 0)
5121 sysfs_unlink_rdev(mddev
, rdev
);
5123 set_capacity(disk
, 0);
5124 mutex_unlock(&mddev
->open_mutex
);
5126 revalidate_disk(disk
);
5131 mutex_unlock(&mddev
->open_mutex
);
5133 * Free resources if final stop
5136 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5138 bitmap_destroy(mddev
);
5139 if (mddev
->bitmap_info
.file
) {
5140 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5141 fput(mddev
->bitmap_info
.file
);
5142 mddev
->bitmap_info
.file
= NULL
;
5144 mddev
->bitmap_info
.offset
= 0;
5146 export_array(mddev
);
5149 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5150 if (mddev
->hold_active
== UNTIL_STOP
)
5151 mddev
->hold_active
= 0;
5153 blk_integrity_unregister(disk
);
5154 md_new_event(mddev
);
5155 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5160 static void autorun_array(struct mddev
*mddev
)
5162 struct md_rdev
*rdev
;
5165 if (list_empty(&mddev
->disks
))
5168 printk(KERN_INFO
"md: running: ");
5170 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5171 char b
[BDEVNAME_SIZE
];
5172 printk("<%s>", bdevname(rdev
->bdev
,b
));
5176 err
= do_md_run(mddev
);
5178 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5179 do_md_stop(mddev
, 0, 0);
5184 * lets try to run arrays based on all disks that have arrived
5185 * until now. (those are in pending_raid_disks)
5187 * the method: pick the first pending disk, collect all disks with
5188 * the same UUID, remove all from the pending list and put them into
5189 * the 'same_array' list. Then order this list based on superblock
5190 * update time (freshest comes first), kick out 'old' disks and
5191 * compare superblocks. If everything's fine then run it.
5193 * If "unit" is allocated, then bump its reference count
5195 static void autorun_devices(int part
)
5197 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5198 struct mddev
*mddev
;
5199 char b
[BDEVNAME_SIZE
];
5201 printk(KERN_INFO
"md: autorun ...\n");
5202 while (!list_empty(&pending_raid_disks
)) {
5205 LIST_HEAD(candidates
);
5206 rdev0
= list_entry(pending_raid_disks
.next
,
5207 struct md_rdev
, same_set
);
5209 printk(KERN_INFO
"md: considering %s ...\n",
5210 bdevname(rdev0
->bdev
,b
));
5211 INIT_LIST_HEAD(&candidates
);
5212 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5213 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5214 printk(KERN_INFO
"md: adding %s ...\n",
5215 bdevname(rdev
->bdev
,b
));
5216 list_move(&rdev
->same_set
, &candidates
);
5219 * now we have a set of devices, with all of them having
5220 * mostly sane superblocks. It's time to allocate the
5224 dev
= MKDEV(mdp_major
,
5225 rdev0
->preferred_minor
<< MdpMinorShift
);
5226 unit
= MINOR(dev
) >> MdpMinorShift
;
5228 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5231 if (rdev0
->preferred_minor
!= unit
) {
5232 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5233 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5237 md_probe(dev
, NULL
, NULL
);
5238 mddev
= mddev_find(dev
);
5239 if (!mddev
|| !mddev
->gendisk
) {
5243 "md: cannot allocate memory for md drive.\n");
5246 if (mddev_lock(mddev
))
5247 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5249 else if (mddev
->raid_disks
|| mddev
->major_version
5250 || !list_empty(&mddev
->disks
)) {
5252 "md: %s already running, cannot run %s\n",
5253 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5254 mddev_unlock(mddev
);
5256 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5257 mddev
->persistent
= 1;
5258 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5259 list_del_init(&rdev
->same_set
);
5260 if (bind_rdev_to_array(rdev
, mddev
))
5263 autorun_array(mddev
);
5264 mddev_unlock(mddev
);
5266 /* on success, candidates will be empty, on error
5269 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5270 list_del_init(&rdev
->same_set
);
5275 printk(KERN_INFO
"md: ... autorun DONE.\n");
5277 #endif /* !MODULE */
5279 static int get_version(void __user
* arg
)
5283 ver
.major
= MD_MAJOR_VERSION
;
5284 ver
.minor
= MD_MINOR_VERSION
;
5285 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5287 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5293 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5295 mdu_array_info_t info
;
5296 int nr
,working
,insync
,failed
,spare
;
5297 struct md_rdev
*rdev
;
5299 nr
=working
=insync
=failed
=spare
=0;
5300 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5302 if (test_bit(Faulty
, &rdev
->flags
))
5306 if (test_bit(In_sync
, &rdev
->flags
))
5313 info
.major_version
= mddev
->major_version
;
5314 info
.minor_version
= mddev
->minor_version
;
5315 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5316 info
.ctime
= mddev
->ctime
;
5317 info
.level
= mddev
->level
;
5318 info
.size
= mddev
->dev_sectors
/ 2;
5319 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5322 info
.raid_disks
= mddev
->raid_disks
;
5323 info
.md_minor
= mddev
->md_minor
;
5324 info
.not_persistent
= !mddev
->persistent
;
5326 info
.utime
= mddev
->utime
;
5329 info
.state
= (1<<MD_SB_CLEAN
);
5330 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5331 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5332 info
.active_disks
= insync
;
5333 info
.working_disks
= working
;
5334 info
.failed_disks
= failed
;
5335 info
.spare_disks
= spare
;
5337 info
.layout
= mddev
->layout
;
5338 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5340 if (copy_to_user(arg
, &info
, sizeof(info
)))
5346 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5348 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5349 char *ptr
, *buf
= NULL
;
5352 if (md_allow_write(mddev
))
5353 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5355 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5360 /* bitmap disabled, zero the first byte and copy out */
5361 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5362 file
->pathname
[0] = '\0';
5366 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5370 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5374 strcpy(file
->pathname
, ptr
);
5378 if (copy_to_user(arg
, file
, sizeof(*file
)))
5386 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5388 mdu_disk_info_t info
;
5389 struct md_rdev
*rdev
;
5391 if (copy_from_user(&info
, arg
, sizeof(info
)))
5394 rdev
= find_rdev_nr(mddev
, info
.number
);
5396 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5397 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5398 info
.raid_disk
= rdev
->raid_disk
;
5400 if (test_bit(Faulty
, &rdev
->flags
))
5401 info
.state
|= (1<<MD_DISK_FAULTY
);
5402 else if (test_bit(In_sync
, &rdev
->flags
)) {
5403 info
.state
|= (1<<MD_DISK_ACTIVE
);
5404 info
.state
|= (1<<MD_DISK_SYNC
);
5406 if (test_bit(WriteMostly
, &rdev
->flags
))
5407 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5409 info
.major
= info
.minor
= 0;
5410 info
.raid_disk
= -1;
5411 info
.state
= (1<<MD_DISK_REMOVED
);
5414 if (copy_to_user(arg
, &info
, sizeof(info
)))
5420 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5422 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5423 struct md_rdev
*rdev
;
5424 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5426 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5429 if (!mddev
->raid_disks
) {
5431 /* expecting a device which has a superblock */
5432 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5435 "md: md_import_device returned %ld\n",
5437 return PTR_ERR(rdev
);
5439 if (!list_empty(&mddev
->disks
)) {
5440 struct md_rdev
*rdev0
5441 = list_entry(mddev
->disks
.next
,
5442 struct md_rdev
, same_set
);
5443 err
= super_types
[mddev
->major_version
]
5444 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5447 "md: %s has different UUID to %s\n",
5448 bdevname(rdev
->bdev
,b
),
5449 bdevname(rdev0
->bdev
,b2
));
5454 err
= bind_rdev_to_array(rdev
, mddev
);
5461 * add_new_disk can be used once the array is assembled
5462 * to add "hot spares". They must already have a superblock
5467 if (!mddev
->pers
->hot_add_disk
) {
5469 "%s: personality does not support diskops!\n",
5473 if (mddev
->persistent
)
5474 rdev
= md_import_device(dev
, mddev
->major_version
,
5475 mddev
->minor_version
);
5477 rdev
= md_import_device(dev
, -1, -1);
5480 "md: md_import_device returned %ld\n",
5482 return PTR_ERR(rdev
);
5484 /* set saved_raid_disk if appropriate */
5485 if (!mddev
->persistent
) {
5486 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5487 info
->raid_disk
< mddev
->raid_disks
) {
5488 rdev
->raid_disk
= info
->raid_disk
;
5489 set_bit(In_sync
, &rdev
->flags
);
5491 rdev
->raid_disk
= -1;
5493 super_types
[mddev
->major_version
].
5494 validate_super(mddev
, rdev
);
5495 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5496 (!test_bit(In_sync
, &rdev
->flags
) ||
5497 rdev
->raid_disk
!= info
->raid_disk
)) {
5498 /* This was a hot-add request, but events doesn't
5499 * match, so reject it.
5505 if (test_bit(In_sync
, &rdev
->flags
))
5506 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5508 rdev
->saved_raid_disk
= -1;
5510 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5511 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5512 set_bit(WriteMostly
, &rdev
->flags
);
5514 clear_bit(WriteMostly
, &rdev
->flags
);
5516 rdev
->raid_disk
= -1;
5517 err
= bind_rdev_to_array(rdev
, mddev
);
5518 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5519 /* If there is hot_add_disk but no hot_remove_disk
5520 * then added disks for geometry changes,
5521 * and should be added immediately.
5523 super_types
[mddev
->major_version
].
5524 validate_super(mddev
, rdev
);
5525 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5527 unbind_rdev_from_array(rdev
);
5532 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5534 md_update_sb(mddev
, 1);
5535 if (mddev
->degraded
)
5536 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5537 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5539 md_new_event(mddev
);
5540 md_wakeup_thread(mddev
->thread
);
5544 /* otherwise, add_new_disk is only allowed
5545 * for major_version==0 superblocks
5547 if (mddev
->major_version
!= 0) {
5548 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5553 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5555 rdev
= md_import_device(dev
, -1, 0);
5558 "md: error, md_import_device() returned %ld\n",
5560 return PTR_ERR(rdev
);
5562 rdev
->desc_nr
= info
->number
;
5563 if (info
->raid_disk
< mddev
->raid_disks
)
5564 rdev
->raid_disk
= info
->raid_disk
;
5566 rdev
->raid_disk
= -1;
5568 if (rdev
->raid_disk
< mddev
->raid_disks
)
5569 if (info
->state
& (1<<MD_DISK_SYNC
))
5570 set_bit(In_sync
, &rdev
->flags
);
5572 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5573 set_bit(WriteMostly
, &rdev
->flags
);
5575 if (!mddev
->persistent
) {
5576 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5577 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5579 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5580 rdev
->sectors
= rdev
->sb_start
;
5582 err
= bind_rdev_to_array(rdev
, mddev
);
5592 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5594 char b
[BDEVNAME_SIZE
];
5595 struct md_rdev
*rdev
;
5597 rdev
= find_rdev(mddev
, dev
);
5601 if (rdev
->raid_disk
>= 0)
5604 kick_rdev_from_array(rdev
);
5605 md_update_sb(mddev
, 1);
5606 md_new_event(mddev
);
5610 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5611 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5615 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5617 char b
[BDEVNAME_SIZE
];
5619 struct md_rdev
*rdev
;
5624 if (mddev
->major_version
!= 0) {
5625 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5626 " version-0 superblocks.\n",
5630 if (!mddev
->pers
->hot_add_disk
) {
5632 "%s: personality does not support diskops!\n",
5637 rdev
= md_import_device(dev
, -1, 0);
5640 "md: error, md_import_device() returned %ld\n",
5645 if (mddev
->persistent
)
5646 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5648 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5650 rdev
->sectors
= rdev
->sb_start
;
5652 if (test_bit(Faulty
, &rdev
->flags
)) {
5654 "md: can not hot-add faulty %s disk to %s!\n",
5655 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5659 clear_bit(In_sync
, &rdev
->flags
);
5661 rdev
->saved_raid_disk
= -1;
5662 err
= bind_rdev_to_array(rdev
, mddev
);
5667 * The rest should better be atomic, we can have disk failures
5668 * noticed in interrupt contexts ...
5671 rdev
->raid_disk
= -1;
5673 md_update_sb(mddev
, 1);
5676 * Kick recovery, maybe this spare has to be added to the
5677 * array immediately.
5679 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5680 md_wakeup_thread(mddev
->thread
);
5681 md_new_event(mddev
);
5689 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5694 if (!mddev
->pers
->quiesce
)
5696 if (mddev
->recovery
|| mddev
->sync_thread
)
5698 /* we should be able to change the bitmap.. */
5704 return -EEXIST
; /* cannot add when bitmap is present */
5705 mddev
->bitmap_info
.file
= fget(fd
);
5707 if (mddev
->bitmap_info
.file
== NULL
) {
5708 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5713 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5715 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5717 fput(mddev
->bitmap_info
.file
);
5718 mddev
->bitmap_info
.file
= NULL
;
5721 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5722 } else if (mddev
->bitmap
== NULL
)
5723 return -ENOENT
; /* cannot remove what isn't there */
5726 mddev
->pers
->quiesce(mddev
, 1);
5728 err
= bitmap_create(mddev
);
5730 err
= bitmap_load(mddev
);
5732 if (fd
< 0 || err
) {
5733 bitmap_destroy(mddev
);
5734 fd
= -1; /* make sure to put the file */
5736 mddev
->pers
->quiesce(mddev
, 0);
5739 if (mddev
->bitmap_info
.file
) {
5740 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5741 fput(mddev
->bitmap_info
.file
);
5743 mddev
->bitmap_info
.file
= NULL
;
5750 * set_array_info is used two different ways
5751 * The original usage is when creating a new array.
5752 * In this usage, raid_disks is > 0 and it together with
5753 * level, size, not_persistent,layout,chunksize determine the
5754 * shape of the array.
5755 * This will always create an array with a type-0.90.0 superblock.
5756 * The newer usage is when assembling an array.
5757 * In this case raid_disks will be 0, and the major_version field is
5758 * use to determine which style super-blocks are to be found on the devices.
5759 * The minor and patch _version numbers are also kept incase the
5760 * super_block handler wishes to interpret them.
5762 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
5765 if (info
->raid_disks
== 0) {
5766 /* just setting version number for superblock loading */
5767 if (info
->major_version
< 0 ||
5768 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5769 super_types
[info
->major_version
].name
== NULL
) {
5770 /* maybe try to auto-load a module? */
5772 "md: superblock version %d not known\n",
5773 info
->major_version
);
5776 mddev
->major_version
= info
->major_version
;
5777 mddev
->minor_version
= info
->minor_version
;
5778 mddev
->patch_version
= info
->patch_version
;
5779 mddev
->persistent
= !info
->not_persistent
;
5780 /* ensure mddev_put doesn't delete this now that there
5781 * is some minimal configuration.
5783 mddev
->ctime
= get_seconds();
5786 mddev
->major_version
= MD_MAJOR_VERSION
;
5787 mddev
->minor_version
= MD_MINOR_VERSION
;
5788 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5789 mddev
->ctime
= get_seconds();
5791 mddev
->level
= info
->level
;
5792 mddev
->clevel
[0] = 0;
5793 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5794 mddev
->raid_disks
= info
->raid_disks
;
5795 /* don't set md_minor, it is determined by which /dev/md* was
5798 if (info
->state
& (1<<MD_SB_CLEAN
))
5799 mddev
->recovery_cp
= MaxSector
;
5801 mddev
->recovery_cp
= 0;
5802 mddev
->persistent
= ! info
->not_persistent
;
5803 mddev
->external
= 0;
5805 mddev
->layout
= info
->layout
;
5806 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5808 mddev
->max_disks
= MD_SB_DISKS
;
5810 if (mddev
->persistent
)
5812 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5814 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5815 mddev
->bitmap_info
.offset
= 0;
5817 mddev
->reshape_position
= MaxSector
;
5820 * Generate a 128 bit UUID
5822 get_random_bytes(mddev
->uuid
, 16);
5824 mddev
->new_level
= mddev
->level
;
5825 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5826 mddev
->new_layout
= mddev
->layout
;
5827 mddev
->delta_disks
= 0;
5832 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
5834 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5836 if (mddev
->external_size
)
5839 mddev
->array_sectors
= array_sectors
;
5841 EXPORT_SYMBOL(md_set_array_sectors
);
5843 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
5845 struct md_rdev
*rdev
;
5847 int fit
= (num_sectors
== 0);
5849 if (mddev
->pers
->resize
== NULL
)
5851 /* The "num_sectors" is the number of sectors of each device that
5852 * is used. This can only make sense for arrays with redundancy.
5853 * linear and raid0 always use whatever space is available. We can only
5854 * consider changing this number if no resync or reconstruction is
5855 * happening, and if the new size is acceptable. It must fit before the
5856 * sb_start or, if that is <data_offset, it must fit before the size
5857 * of each device. If num_sectors is zero, we find the largest size
5860 if (mddev
->sync_thread
)
5863 /* Sorry, cannot grow a bitmap yet, just remove it,
5867 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5868 sector_t avail
= rdev
->sectors
;
5870 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5871 num_sectors
= avail
;
5872 if (avail
< num_sectors
)
5875 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5877 revalidate_disk(mddev
->gendisk
);
5881 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
5884 /* change the number of raid disks */
5885 if (mddev
->pers
->check_reshape
== NULL
)
5887 if (raid_disks
<= 0 ||
5888 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5890 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5892 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5894 rv
= mddev
->pers
->check_reshape(mddev
);
5896 mddev
->delta_disks
= 0;
5902 * update_array_info is used to change the configuration of an
5904 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5905 * fields in the info are checked against the array.
5906 * Any differences that cannot be handled will cause an error.
5907 * Normally, only one change can be managed at a time.
5909 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
5915 /* calculate expected state,ignoring low bits */
5916 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5917 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5919 if (mddev
->major_version
!= info
->major_version
||
5920 mddev
->minor_version
!= info
->minor_version
||
5921 /* mddev->patch_version != info->patch_version || */
5922 mddev
->ctime
!= info
->ctime
||
5923 mddev
->level
!= info
->level
||
5924 /* mddev->layout != info->layout || */
5925 !mddev
->persistent
!= info
->not_persistent
||
5926 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5927 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5928 ((state
^info
->state
) & 0xfffffe00)
5931 /* Check there is only one change */
5932 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5934 if (mddev
->raid_disks
!= info
->raid_disks
)
5936 if (mddev
->layout
!= info
->layout
)
5938 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5945 if (mddev
->layout
!= info
->layout
) {
5947 * we don't need to do anything at the md level, the
5948 * personality will take care of it all.
5950 if (mddev
->pers
->check_reshape
== NULL
)
5953 mddev
->new_layout
= info
->layout
;
5954 rv
= mddev
->pers
->check_reshape(mddev
);
5956 mddev
->new_layout
= mddev
->layout
;
5960 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5961 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5963 if (mddev
->raid_disks
!= info
->raid_disks
)
5964 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5966 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5967 if (mddev
->pers
->quiesce
== NULL
)
5969 if (mddev
->recovery
|| mddev
->sync_thread
)
5971 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5972 /* add the bitmap */
5975 if (mddev
->bitmap_info
.default_offset
== 0)
5977 mddev
->bitmap_info
.offset
=
5978 mddev
->bitmap_info
.default_offset
;
5979 mddev
->pers
->quiesce(mddev
, 1);
5980 rv
= bitmap_create(mddev
);
5982 rv
= bitmap_load(mddev
);
5984 bitmap_destroy(mddev
);
5985 mddev
->pers
->quiesce(mddev
, 0);
5987 /* remove the bitmap */
5990 if (mddev
->bitmap
->file
)
5992 mddev
->pers
->quiesce(mddev
, 1);
5993 bitmap_destroy(mddev
);
5994 mddev
->pers
->quiesce(mddev
, 0);
5995 mddev
->bitmap_info
.offset
= 0;
5998 md_update_sb(mddev
, 1);
6002 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6004 struct md_rdev
*rdev
;
6006 if (mddev
->pers
== NULL
)
6009 rdev
= find_rdev(mddev
, dev
);
6013 md_error(mddev
, rdev
);
6014 if (!test_bit(Faulty
, &rdev
->flags
))
6020 * We have a problem here : there is no easy way to give a CHS
6021 * virtual geometry. We currently pretend that we have a 2 heads
6022 * 4 sectors (with a BIG number of cylinders...). This drives
6023 * dosfs just mad... ;-)
6025 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6027 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6031 geo
->cylinders
= mddev
->array_sectors
/ 8;
6035 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6036 unsigned int cmd
, unsigned long arg
)
6039 void __user
*argp
= (void __user
*)arg
;
6040 struct mddev
*mddev
= NULL
;
6043 if (!capable(CAP_SYS_ADMIN
))
6047 * Commands dealing with the RAID driver but not any
6053 err
= get_version(argp
);
6056 case PRINT_RAID_DEBUG
:
6064 autostart_arrays(arg
);
6071 * Commands creating/starting a new array:
6074 mddev
= bdev
->bd_disk
->private_data
;
6081 err
= mddev_lock(mddev
);
6084 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6091 case SET_ARRAY_INFO
:
6093 mdu_array_info_t info
;
6095 memset(&info
, 0, sizeof(info
));
6096 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6101 err
= update_array_info(mddev
, &info
);
6103 printk(KERN_WARNING
"md: couldn't update"
6104 " array info. %d\n", err
);
6109 if (!list_empty(&mddev
->disks
)) {
6111 "md: array %s already has disks!\n",
6116 if (mddev
->raid_disks
) {
6118 "md: array %s already initialised!\n",
6123 err
= set_array_info(mddev
, &info
);
6125 printk(KERN_WARNING
"md: couldn't set"
6126 " array info. %d\n", err
);
6136 * Commands querying/configuring an existing array:
6138 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6139 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6140 if ((!mddev
->raid_disks
&& !mddev
->external
)
6141 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6142 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6143 && cmd
!= GET_BITMAP_FILE
) {
6149 * Commands even a read-only array can execute:
6153 case GET_ARRAY_INFO
:
6154 err
= get_array_info(mddev
, argp
);
6157 case GET_BITMAP_FILE
:
6158 err
= get_bitmap_file(mddev
, argp
);
6162 err
= get_disk_info(mddev
, argp
);
6165 case RESTART_ARRAY_RW
:
6166 err
= restart_array(mddev
);
6170 err
= do_md_stop(mddev
, 0, 1);
6174 err
= md_set_readonly(mddev
, 1);
6178 if (get_user(ro
, (int __user
*)(arg
))) {
6184 /* if the bdev is going readonly the value of mddev->ro
6185 * does not matter, no writes are coming
6190 /* are we are already prepared for writes? */
6194 /* transitioning to readauto need only happen for
6195 * arrays that call md_write_start
6198 err
= restart_array(mddev
);
6201 set_disk_ro(mddev
->gendisk
, 0);
6208 * The remaining ioctls are changing the state of the
6209 * superblock, so we do not allow them on read-only arrays.
6210 * However non-MD ioctls (e.g. get-size) will still come through
6211 * here and hit the 'default' below, so only disallow
6212 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6214 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6215 if (mddev
->ro
== 2) {
6217 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6218 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6219 md_wakeup_thread(mddev
->thread
);
6230 mdu_disk_info_t info
;
6231 if (copy_from_user(&info
, argp
, sizeof(info
)))
6234 err
= add_new_disk(mddev
, &info
);
6238 case HOT_REMOVE_DISK
:
6239 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6243 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6246 case SET_DISK_FAULTY
:
6247 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6251 err
= do_md_run(mddev
);
6254 case SET_BITMAP_FILE
:
6255 err
= set_bitmap_file(mddev
, (int)arg
);
6265 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6267 mddev
->hold_active
= 0;
6268 mddev_unlock(mddev
);
6277 #ifdef CONFIG_COMPAT
6278 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6279 unsigned int cmd
, unsigned long arg
)
6282 case HOT_REMOVE_DISK
:
6284 case SET_DISK_FAULTY
:
6285 case SET_BITMAP_FILE
:
6286 /* These take in integer arg, do not convert */
6289 arg
= (unsigned long)compat_ptr(arg
);
6293 return md_ioctl(bdev
, mode
, cmd
, arg
);
6295 #endif /* CONFIG_COMPAT */
6297 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6300 * Succeed if we can lock the mddev, which confirms that
6301 * it isn't being stopped right now.
6303 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6306 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6307 /* we are racing with mddev_put which is discarding this
6311 /* Wait until bdev->bd_disk is definitely gone */
6312 flush_workqueue(md_misc_wq
);
6313 /* Then retry the open from the top */
6314 return -ERESTARTSYS
;
6316 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6318 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6322 atomic_inc(&mddev
->openers
);
6323 mutex_unlock(&mddev
->open_mutex
);
6325 check_disk_change(bdev
);
6330 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6332 struct mddev
*mddev
= disk
->private_data
;
6335 atomic_dec(&mddev
->openers
);
6341 static int md_media_changed(struct gendisk
*disk
)
6343 struct mddev
*mddev
= disk
->private_data
;
6345 return mddev
->changed
;
6348 static int md_revalidate(struct gendisk
*disk
)
6350 struct mddev
*mddev
= disk
->private_data
;
6355 static const struct block_device_operations md_fops
=
6357 .owner
= THIS_MODULE
,
6359 .release
= md_release
,
6361 #ifdef CONFIG_COMPAT
6362 .compat_ioctl
= md_compat_ioctl
,
6364 .getgeo
= md_getgeo
,
6365 .media_changed
= md_media_changed
,
6366 .revalidate_disk
= md_revalidate
,
6369 static int md_thread(void * arg
)
6371 struct md_thread
*thread
= arg
;
6374 * md_thread is a 'system-thread', it's priority should be very
6375 * high. We avoid resource deadlocks individually in each
6376 * raid personality. (RAID5 does preallocation) We also use RR and
6377 * the very same RT priority as kswapd, thus we will never get
6378 * into a priority inversion deadlock.
6380 * we definitely have to have equal or higher priority than
6381 * bdflush, otherwise bdflush will deadlock if there are too
6382 * many dirty RAID5 blocks.
6385 allow_signal(SIGKILL
);
6386 while (!kthread_should_stop()) {
6388 /* We need to wait INTERRUPTIBLE so that
6389 * we don't add to the load-average.
6390 * That means we need to be sure no signals are
6393 if (signal_pending(current
))
6394 flush_signals(current
);
6396 wait_event_interruptible_timeout
6398 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6399 || kthread_should_stop(),
6402 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6403 if (!kthread_should_stop())
6404 thread
->run(thread
->mddev
);
6410 void md_wakeup_thread(struct md_thread
*thread
)
6413 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6414 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6415 wake_up(&thread
->wqueue
);
6419 struct md_thread
*md_register_thread(void (*run
) (struct mddev
*), struct mddev
*mddev
,
6422 struct md_thread
*thread
;
6424 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6428 init_waitqueue_head(&thread
->wqueue
);
6431 thread
->mddev
= mddev
;
6432 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6433 thread
->tsk
= kthread_run(md_thread
, thread
,
6435 mdname(thread
->mddev
),
6436 name
?: mddev
->pers
->name
);
6437 if (IS_ERR(thread
->tsk
)) {
6444 void md_unregister_thread(struct md_thread
**threadp
)
6446 struct md_thread
*thread
= *threadp
;
6449 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6450 /* Locking ensures that mddev_unlock does not wake_up a
6451 * non-existent thread
6453 spin_lock(&pers_lock
);
6455 spin_unlock(&pers_lock
);
6457 kthread_stop(thread
->tsk
);
6461 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6468 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6471 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6473 mddev
->pers
->error_handler(mddev
,rdev
);
6474 if (mddev
->degraded
)
6475 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6476 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6477 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6478 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6479 md_wakeup_thread(mddev
->thread
);
6480 if (mddev
->event_work
.func
)
6481 queue_work(md_misc_wq
, &mddev
->event_work
);
6482 md_new_event_inintr(mddev
);
6485 /* seq_file implementation /proc/mdstat */
6487 static void status_unused(struct seq_file
*seq
)
6490 struct md_rdev
*rdev
;
6492 seq_printf(seq
, "unused devices: ");
6494 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6495 char b
[BDEVNAME_SIZE
];
6497 seq_printf(seq
, "%s ",
6498 bdevname(rdev
->bdev
,b
));
6501 seq_printf(seq
, "<none>");
6503 seq_printf(seq
, "\n");
6507 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6509 sector_t max_sectors
, resync
, res
;
6510 unsigned long dt
, db
;
6513 unsigned int per_milli
;
6515 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6517 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6518 max_sectors
= mddev
->resync_max_sectors
;
6520 max_sectors
= mddev
->dev_sectors
;
6523 * Should not happen.
6529 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6530 * in a sector_t, and (max_sectors>>scale) will fit in a
6531 * u32, as those are the requirements for sector_div.
6532 * Thus 'scale' must be at least 10
6535 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6536 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6539 res
= (resync
>>scale
)*1000;
6540 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6544 int i
, x
= per_milli
/50, y
= 20-x
;
6545 seq_printf(seq
, "[");
6546 for (i
= 0; i
< x
; i
++)
6547 seq_printf(seq
, "=");
6548 seq_printf(seq
, ">");
6549 for (i
= 0; i
< y
; i
++)
6550 seq_printf(seq
, ".");
6551 seq_printf(seq
, "] ");
6553 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6554 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6556 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6558 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6559 "resync" : "recovery"))),
6560 per_milli
/10, per_milli
% 10,
6561 (unsigned long long) resync
/2,
6562 (unsigned long long) max_sectors
/2);
6565 * dt: time from mark until now
6566 * db: blocks written from mark until now
6567 * rt: remaining time
6569 * rt is a sector_t, so could be 32bit or 64bit.
6570 * So we divide before multiply in case it is 32bit and close
6572 * We scale the divisor (db) by 32 to avoid losing precision
6573 * near the end of resync when the number of remaining sectors
6575 * We then divide rt by 32 after multiplying by db to compensate.
6576 * The '+1' avoids division by zero if db is very small.
6578 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6580 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6581 - mddev
->resync_mark_cnt
;
6583 rt
= max_sectors
- resync
; /* number of remaining sectors */
6584 sector_div(rt
, db
/32+1);
6588 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6589 ((unsigned long)rt
% 60)/6);
6591 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6594 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6596 struct list_head
*tmp
;
6598 struct mddev
*mddev
;
6606 spin_lock(&all_mddevs_lock
);
6607 list_for_each(tmp
,&all_mddevs
)
6609 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6611 spin_unlock(&all_mddevs_lock
);
6614 spin_unlock(&all_mddevs_lock
);
6616 return (void*)2;/* tail */
6620 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6622 struct list_head
*tmp
;
6623 struct mddev
*next_mddev
, *mddev
= v
;
6629 spin_lock(&all_mddevs_lock
);
6631 tmp
= all_mddevs
.next
;
6633 tmp
= mddev
->all_mddevs
.next
;
6634 if (tmp
!= &all_mddevs
)
6635 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6637 next_mddev
= (void*)2;
6640 spin_unlock(&all_mddevs_lock
);
6648 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6650 struct mddev
*mddev
= v
;
6652 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6656 static int md_seq_show(struct seq_file
*seq
, void *v
)
6658 struct mddev
*mddev
= v
;
6660 struct md_rdev
*rdev
;
6661 struct bitmap
*bitmap
;
6663 if (v
== (void*)1) {
6664 struct md_personality
*pers
;
6665 seq_printf(seq
, "Personalities : ");
6666 spin_lock(&pers_lock
);
6667 list_for_each_entry(pers
, &pers_list
, list
)
6668 seq_printf(seq
, "[%s] ", pers
->name
);
6670 spin_unlock(&pers_lock
);
6671 seq_printf(seq
, "\n");
6672 seq
->poll_event
= atomic_read(&md_event_count
);
6675 if (v
== (void*)2) {
6680 if (mddev_lock(mddev
) < 0)
6683 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6684 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6685 mddev
->pers
? "" : "in");
6688 seq_printf(seq
, " (read-only)");
6690 seq_printf(seq
, " (auto-read-only)");
6691 seq_printf(seq
, " %s", mddev
->pers
->name
);
6695 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6696 char b
[BDEVNAME_SIZE
];
6697 seq_printf(seq
, " %s[%d]",
6698 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6699 if (test_bit(WriteMostly
, &rdev
->flags
))
6700 seq_printf(seq
, "(W)");
6701 if (test_bit(Faulty
, &rdev
->flags
)) {
6702 seq_printf(seq
, "(F)");
6704 } else if (rdev
->raid_disk
< 0)
6705 seq_printf(seq
, "(S)"); /* spare */
6706 sectors
+= rdev
->sectors
;
6709 if (!list_empty(&mddev
->disks
)) {
6711 seq_printf(seq
, "\n %llu blocks",
6712 (unsigned long long)
6713 mddev
->array_sectors
/ 2);
6715 seq_printf(seq
, "\n %llu blocks",
6716 (unsigned long long)sectors
/ 2);
6718 if (mddev
->persistent
) {
6719 if (mddev
->major_version
!= 0 ||
6720 mddev
->minor_version
!= 90) {
6721 seq_printf(seq
," super %d.%d",
6722 mddev
->major_version
,
6723 mddev
->minor_version
);
6725 } else if (mddev
->external
)
6726 seq_printf(seq
, " super external:%s",
6727 mddev
->metadata_type
);
6729 seq_printf(seq
, " super non-persistent");
6732 mddev
->pers
->status(seq
, mddev
);
6733 seq_printf(seq
, "\n ");
6734 if (mddev
->pers
->sync_request
) {
6735 if (mddev
->curr_resync
> 2) {
6736 status_resync(seq
, mddev
);
6737 seq_printf(seq
, "\n ");
6738 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6739 seq_printf(seq
, "\tresync=DELAYED\n ");
6740 else if (mddev
->recovery_cp
< MaxSector
)
6741 seq_printf(seq
, "\tresync=PENDING\n ");
6744 seq_printf(seq
, "\n ");
6746 if ((bitmap
= mddev
->bitmap
)) {
6747 unsigned long chunk_kb
;
6748 unsigned long flags
;
6749 spin_lock_irqsave(&bitmap
->lock
, flags
);
6750 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6751 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6753 bitmap
->pages
- bitmap
->missing_pages
,
6755 (bitmap
->pages
- bitmap
->missing_pages
)
6756 << (PAGE_SHIFT
- 10),
6757 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6758 chunk_kb
? "KB" : "B");
6760 seq_printf(seq
, ", file: ");
6761 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6764 seq_printf(seq
, "\n");
6765 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6768 seq_printf(seq
, "\n");
6770 mddev_unlock(mddev
);
6775 static const struct seq_operations md_seq_ops
= {
6776 .start
= md_seq_start
,
6777 .next
= md_seq_next
,
6778 .stop
= md_seq_stop
,
6779 .show
= md_seq_show
,
6782 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6784 struct seq_file
*seq
;
6787 error
= seq_open(file
, &md_seq_ops
);
6791 seq
= file
->private_data
;
6792 seq
->poll_event
= atomic_read(&md_event_count
);
6796 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6798 struct seq_file
*seq
= filp
->private_data
;
6801 poll_wait(filp
, &md_event_waiters
, wait
);
6803 /* always allow read */
6804 mask
= POLLIN
| POLLRDNORM
;
6806 if (seq
->poll_event
!= atomic_read(&md_event_count
))
6807 mask
|= POLLERR
| POLLPRI
;
6811 static const struct file_operations md_seq_fops
= {
6812 .owner
= THIS_MODULE
,
6813 .open
= md_seq_open
,
6815 .llseek
= seq_lseek
,
6816 .release
= seq_release_private
,
6817 .poll
= mdstat_poll
,
6820 int register_md_personality(struct md_personality
*p
)
6822 spin_lock(&pers_lock
);
6823 list_add_tail(&p
->list
, &pers_list
);
6824 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6825 spin_unlock(&pers_lock
);
6829 int unregister_md_personality(struct md_personality
*p
)
6831 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6832 spin_lock(&pers_lock
);
6833 list_del_init(&p
->list
);
6834 spin_unlock(&pers_lock
);
6838 static int is_mddev_idle(struct mddev
*mddev
, int init
)
6840 struct md_rdev
* rdev
;
6846 rdev_for_each_rcu(rdev
, mddev
) {
6847 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6848 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6849 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6850 atomic_read(&disk
->sync_io
);
6851 /* sync IO will cause sync_io to increase before the disk_stats
6852 * as sync_io is counted when a request starts, and
6853 * disk_stats is counted when it completes.
6854 * So resync activity will cause curr_events to be smaller than
6855 * when there was no such activity.
6856 * non-sync IO will cause disk_stat to increase without
6857 * increasing sync_io so curr_events will (eventually)
6858 * be larger than it was before. Once it becomes
6859 * substantially larger, the test below will cause
6860 * the array to appear non-idle, and resync will slow
6862 * If there is a lot of outstanding resync activity when
6863 * we set last_event to curr_events, then all that activity
6864 * completing might cause the array to appear non-idle
6865 * and resync will be slowed down even though there might
6866 * not have been non-resync activity. This will only
6867 * happen once though. 'last_events' will soon reflect
6868 * the state where there is little or no outstanding
6869 * resync requests, and further resync activity will
6870 * always make curr_events less than last_events.
6873 if (init
|| curr_events
- rdev
->last_events
> 64) {
6874 rdev
->last_events
= curr_events
;
6882 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
6884 /* another "blocks" (512byte) blocks have been synced */
6885 atomic_sub(blocks
, &mddev
->recovery_active
);
6886 wake_up(&mddev
->recovery_wait
);
6888 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6889 md_wakeup_thread(mddev
->thread
);
6890 // stop recovery, signal do_sync ....
6895 /* md_write_start(mddev, bi)
6896 * If we need to update some array metadata (e.g. 'active' flag
6897 * in superblock) before writing, schedule a superblock update
6898 * and wait for it to complete.
6900 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
6903 if (bio_data_dir(bi
) != WRITE
)
6906 BUG_ON(mddev
->ro
== 1);
6907 if (mddev
->ro
== 2) {
6908 /* need to switch to read/write */
6910 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6911 md_wakeup_thread(mddev
->thread
);
6912 md_wakeup_thread(mddev
->sync_thread
);
6915 atomic_inc(&mddev
->writes_pending
);
6916 if (mddev
->safemode
== 1)
6917 mddev
->safemode
= 0;
6918 if (mddev
->in_sync
) {
6919 spin_lock_irq(&mddev
->write_lock
);
6920 if (mddev
->in_sync
) {
6922 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6923 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6924 md_wakeup_thread(mddev
->thread
);
6927 spin_unlock_irq(&mddev
->write_lock
);
6930 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6931 wait_event(mddev
->sb_wait
,
6932 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6935 void md_write_end(struct mddev
*mddev
)
6937 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6938 if (mddev
->safemode
== 2)
6939 md_wakeup_thread(mddev
->thread
);
6940 else if (mddev
->safemode_delay
)
6941 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6945 /* md_allow_write(mddev)
6946 * Calling this ensures that the array is marked 'active' so that writes
6947 * may proceed without blocking. It is important to call this before
6948 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6949 * Must be called with mddev_lock held.
6951 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6952 * is dropped, so return -EAGAIN after notifying userspace.
6954 int md_allow_write(struct mddev
*mddev
)
6960 if (!mddev
->pers
->sync_request
)
6963 spin_lock_irq(&mddev
->write_lock
);
6964 if (mddev
->in_sync
) {
6966 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6967 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6968 if (mddev
->safemode_delay
&&
6969 mddev
->safemode
== 0)
6970 mddev
->safemode
= 1;
6971 spin_unlock_irq(&mddev
->write_lock
);
6972 md_update_sb(mddev
, 0);
6973 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6975 spin_unlock_irq(&mddev
->write_lock
);
6977 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6982 EXPORT_SYMBOL_GPL(md_allow_write
);
6984 #define SYNC_MARKS 10
6985 #define SYNC_MARK_STEP (3*HZ)
6986 void md_do_sync(struct mddev
*mddev
)
6988 struct mddev
*mddev2
;
6989 unsigned int currspeed
= 0,
6991 sector_t max_sectors
,j
, io_sectors
;
6992 unsigned long mark
[SYNC_MARKS
];
6993 sector_t mark_cnt
[SYNC_MARKS
];
6995 struct list_head
*tmp
;
6996 sector_t last_check
;
6998 struct md_rdev
*rdev
;
7001 /* just incase thread restarts... */
7002 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7004 if (mddev
->ro
) /* never try to sync a read-only array */
7007 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7008 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
7009 desc
= "data-check";
7010 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7011 desc
= "requested-resync";
7014 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7019 /* we overload curr_resync somewhat here.
7020 * 0 == not engaged in resync at all
7021 * 2 == checking that there is no conflict with another sync
7022 * 1 == like 2, but have yielded to allow conflicting resync to
7024 * other == active in resync - this many blocks
7026 * Before starting a resync we must have set curr_resync to
7027 * 2, and then checked that every "conflicting" array has curr_resync
7028 * less than ours. When we find one that is the same or higher
7029 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7030 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7031 * This will mean we have to start checking from the beginning again.
7036 mddev
->curr_resync
= 2;
7039 if (kthread_should_stop())
7040 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7042 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7044 for_each_mddev(mddev2
, tmp
) {
7045 if (mddev2
== mddev
)
7047 if (!mddev
->parallel_resync
7048 && mddev2
->curr_resync
7049 && match_mddev_units(mddev
, mddev2
)) {
7051 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7052 /* arbitrarily yield */
7053 mddev
->curr_resync
= 1;
7054 wake_up(&resync_wait
);
7056 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7057 /* no need to wait here, we can wait the next
7058 * time 'round when curr_resync == 2
7061 /* We need to wait 'interruptible' so as not to
7062 * contribute to the load average, and not to
7063 * be caught by 'softlockup'
7065 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7066 if (!kthread_should_stop() &&
7067 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7068 printk(KERN_INFO
"md: delaying %s of %s"
7069 " until %s has finished (they"
7070 " share one or more physical units)\n",
7071 desc
, mdname(mddev
), mdname(mddev2
));
7073 if (signal_pending(current
))
7074 flush_signals(current
);
7076 finish_wait(&resync_wait
, &wq
);
7079 finish_wait(&resync_wait
, &wq
);
7082 } while (mddev
->curr_resync
< 2);
7085 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7086 /* resync follows the size requested by the personality,
7087 * which defaults to physical size, but can be virtual size
7089 max_sectors
= mddev
->resync_max_sectors
;
7090 mddev
->resync_mismatches
= 0;
7091 /* we don't use the checkpoint if there's a bitmap */
7092 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7093 j
= mddev
->resync_min
;
7094 else if (!mddev
->bitmap
)
7095 j
= mddev
->recovery_cp
;
7097 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7098 max_sectors
= mddev
->dev_sectors
;
7100 /* recovery follows the physical size of devices */
7101 max_sectors
= mddev
->dev_sectors
;
7104 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
7105 if (rdev
->raid_disk
>= 0 &&
7106 !test_bit(Faulty
, &rdev
->flags
) &&
7107 !test_bit(In_sync
, &rdev
->flags
) &&
7108 rdev
->recovery_offset
< j
)
7109 j
= rdev
->recovery_offset
;
7113 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7114 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7115 " %d KB/sec/disk.\n", speed_min(mddev
));
7116 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7117 "(but not more than %d KB/sec) for %s.\n",
7118 speed_max(mddev
), desc
);
7120 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7123 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7125 mark_cnt
[m
] = io_sectors
;
7128 mddev
->resync_mark
= mark
[last_mark
];
7129 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7132 * Tune reconstruction:
7134 window
= 32*(PAGE_SIZE
/512);
7135 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7136 window
/2, (unsigned long long)max_sectors
/2);
7138 atomic_set(&mddev
->recovery_active
, 0);
7143 "md: resuming %s of %s from checkpoint.\n",
7144 desc
, mdname(mddev
));
7145 mddev
->curr_resync
= j
;
7147 mddev
->curr_resync_completed
= j
;
7149 while (j
< max_sectors
) {
7154 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7155 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7156 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7157 > (max_sectors
>> 4)) ||
7158 (j
- mddev
->curr_resync_completed
)*2
7159 >= mddev
->resync_max
- mddev
->curr_resync_completed
7161 /* time to update curr_resync_completed */
7162 wait_event(mddev
->recovery_wait
,
7163 atomic_read(&mddev
->recovery_active
) == 0);
7164 mddev
->curr_resync_completed
= j
;
7165 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7166 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7169 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
7170 /* As this condition is controlled by user-space,
7171 * we can block indefinitely, so use '_interruptible'
7172 * to avoid triggering warnings.
7174 flush_signals(current
); /* just in case */
7175 wait_event_interruptible(mddev
->recovery_wait
,
7176 mddev
->resync_max
> j
7177 || kthread_should_stop());
7180 if (kthread_should_stop())
7183 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7184 currspeed
< speed_min(mddev
));
7186 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7190 if (!skipped
) { /* actual IO requested */
7191 io_sectors
+= sectors
;
7192 atomic_add(sectors
, &mddev
->recovery_active
);
7195 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7199 if (j
>1) mddev
->curr_resync
= j
;
7200 mddev
->curr_mark_cnt
= io_sectors
;
7201 if (last_check
== 0)
7202 /* this is the earliest that rebuild will be
7203 * visible in /proc/mdstat
7205 md_new_event(mddev
);
7207 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7210 last_check
= io_sectors
;
7212 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7214 int next
= (last_mark
+1) % SYNC_MARKS
;
7216 mddev
->resync_mark
= mark
[next
];
7217 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7218 mark
[next
] = jiffies
;
7219 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7224 if (kthread_should_stop())
7229 * this loop exits only if either when we are slower than
7230 * the 'hard' speed limit, or the system was IO-idle for
7232 * the system might be non-idle CPU-wise, but we only care
7233 * about not overloading the IO subsystem. (things like an
7234 * e2fsck being done on the RAID array should execute fast)
7238 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7239 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7241 if (currspeed
> speed_min(mddev
)) {
7242 if ((currspeed
> speed_max(mddev
)) ||
7243 !is_mddev_idle(mddev
, 0)) {
7249 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7251 * this also signals 'finished resyncing' to md_stop
7254 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7256 /* tell personality that we are finished */
7257 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7259 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7260 mddev
->curr_resync
> 2) {
7261 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7262 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7263 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7265 "md: checkpointing %s of %s.\n",
7266 desc
, mdname(mddev
));
7267 mddev
->recovery_cp
= mddev
->curr_resync
;
7270 mddev
->recovery_cp
= MaxSector
;
7272 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7273 mddev
->curr_resync
= MaxSector
;
7275 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
7276 if (rdev
->raid_disk
>= 0 &&
7277 mddev
->delta_disks
>= 0 &&
7278 !test_bit(Faulty
, &rdev
->flags
) &&
7279 !test_bit(In_sync
, &rdev
->flags
) &&
7280 rdev
->recovery_offset
< mddev
->curr_resync
)
7281 rdev
->recovery_offset
= mddev
->curr_resync
;
7285 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7288 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7289 /* We completed so min/max setting can be forgotten if used. */
7290 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7291 mddev
->resync_min
= 0;
7292 mddev
->resync_max
= MaxSector
;
7293 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7294 mddev
->resync_min
= mddev
->curr_resync_completed
;
7295 mddev
->curr_resync
= 0;
7296 wake_up(&resync_wait
);
7297 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7298 md_wakeup_thread(mddev
->thread
);
7303 * got a signal, exit.
7306 "md: md_do_sync() got signal ... exiting\n");
7307 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7311 EXPORT_SYMBOL_GPL(md_do_sync
);
7313 static int remove_and_add_spares(struct mddev
*mddev
)
7315 struct md_rdev
*rdev
;
7318 mddev
->curr_resync_completed
= 0;
7320 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7321 if (rdev
->raid_disk
>= 0 &&
7322 !test_bit(Blocked
, &rdev
->flags
) &&
7323 (test_bit(Faulty
, &rdev
->flags
) ||
7324 ! test_bit(In_sync
, &rdev
->flags
)) &&
7325 atomic_read(&rdev
->nr_pending
)==0) {
7326 if (mddev
->pers
->hot_remove_disk(
7327 mddev
, rdev
->raid_disk
)==0) {
7328 sysfs_unlink_rdev(mddev
, rdev
);
7329 rdev
->raid_disk
= -1;
7333 if (mddev
->degraded
) {
7334 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7335 if (rdev
->raid_disk
>= 0 &&
7336 !test_bit(In_sync
, &rdev
->flags
) &&
7337 !test_bit(Faulty
, &rdev
->flags
))
7339 if (rdev
->raid_disk
< 0
7340 && !test_bit(Faulty
, &rdev
->flags
)) {
7341 rdev
->recovery_offset
= 0;
7343 hot_add_disk(mddev
, rdev
) == 0) {
7344 if (sysfs_link_rdev(mddev
, rdev
))
7345 /* failure here is OK */;
7347 md_new_event(mddev
);
7348 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7357 static void reap_sync_thread(struct mddev
*mddev
)
7359 struct md_rdev
*rdev
;
7361 /* resync has finished, collect result */
7362 md_unregister_thread(&mddev
->sync_thread
);
7363 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7364 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7366 /* activate any spares */
7367 if (mddev
->pers
->spare_active(mddev
))
7368 sysfs_notify(&mddev
->kobj
, NULL
,
7371 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7372 mddev
->pers
->finish_reshape
)
7373 mddev
->pers
->finish_reshape(mddev
);
7375 /* If array is no-longer degraded, then any saved_raid_disk
7376 * information must be scrapped. Also if any device is now
7377 * In_sync we must scrape the saved_raid_disk for that device
7378 * do the superblock for an incrementally recovered device
7381 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7382 if (!mddev
->degraded
||
7383 test_bit(In_sync
, &rdev
->flags
))
7384 rdev
->saved_raid_disk
= -1;
7386 md_update_sb(mddev
, 1);
7387 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7388 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7389 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7390 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7391 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7392 /* flag recovery needed just to double check */
7393 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7394 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7395 md_new_event(mddev
);
7396 if (mddev
->event_work
.func
)
7397 queue_work(md_misc_wq
, &mddev
->event_work
);
7401 * This routine is regularly called by all per-raid-array threads to
7402 * deal with generic issues like resync and super-block update.
7403 * Raid personalities that don't have a thread (linear/raid0) do not
7404 * need this as they never do any recovery or update the superblock.
7406 * It does not do any resync itself, but rather "forks" off other threads
7407 * to do that as needed.
7408 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7409 * "->recovery" and create a thread at ->sync_thread.
7410 * When the thread finishes it sets MD_RECOVERY_DONE
7411 * and wakeups up this thread which will reap the thread and finish up.
7412 * This thread also removes any faulty devices (with nr_pending == 0).
7414 * The overall approach is:
7415 * 1/ if the superblock needs updating, update it.
7416 * 2/ If a recovery thread is running, don't do anything else.
7417 * 3/ If recovery has finished, clean up, possibly marking spares active.
7418 * 4/ If there are any faulty devices, remove them.
7419 * 5/ If array is degraded, try to add spares devices
7420 * 6/ If array has spares or is not in-sync, start a resync thread.
7422 void md_check_recovery(struct mddev
*mddev
)
7424 if (mddev
->suspended
)
7428 bitmap_daemon_work(mddev
);
7430 if (signal_pending(current
)) {
7431 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7432 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7434 mddev
->safemode
= 2;
7436 flush_signals(current
);
7439 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7442 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7443 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7444 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7445 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7446 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7447 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7451 if (mddev_trylock(mddev
)) {
7455 /* Only thing we do on a ro array is remove
7458 struct md_rdev
*rdev
;
7459 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7460 if (rdev
->raid_disk
>= 0 &&
7461 !test_bit(Blocked
, &rdev
->flags
) &&
7462 test_bit(Faulty
, &rdev
->flags
) &&
7463 atomic_read(&rdev
->nr_pending
)==0) {
7464 if (mddev
->pers
->hot_remove_disk(
7465 mddev
, rdev
->raid_disk
)==0) {
7466 sysfs_unlink_rdev(mddev
, rdev
);
7467 rdev
->raid_disk
= -1;
7470 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7474 if (!mddev
->external
) {
7476 spin_lock_irq(&mddev
->write_lock
);
7477 if (mddev
->safemode
&&
7478 !atomic_read(&mddev
->writes_pending
) &&
7480 mddev
->recovery_cp
== MaxSector
) {
7483 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7485 if (mddev
->safemode
== 1)
7486 mddev
->safemode
= 0;
7487 spin_unlock_irq(&mddev
->write_lock
);
7489 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7493 md_update_sb(mddev
, 0);
7495 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7496 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7497 /* resync/recovery still happening */
7498 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7501 if (mddev
->sync_thread
) {
7502 reap_sync_thread(mddev
);
7505 /* Set RUNNING before clearing NEEDED to avoid
7506 * any transients in the value of "sync_action".
7508 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7509 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7510 /* Clear some bits that don't mean anything, but
7513 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7514 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7516 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7518 /* no recovery is running.
7519 * remove any failed drives, then
7520 * add spares if possible.
7521 * Spare are also removed and re-added, to allow
7522 * the personality to fail the re-add.
7525 if (mddev
->reshape_position
!= MaxSector
) {
7526 if (mddev
->pers
->check_reshape
== NULL
||
7527 mddev
->pers
->check_reshape(mddev
) != 0)
7528 /* Cannot proceed */
7530 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7531 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7532 } else if ((spares
= remove_and_add_spares(mddev
))) {
7533 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7534 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7535 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7536 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7537 } else if (mddev
->recovery_cp
< MaxSector
) {
7538 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7539 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7540 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7541 /* nothing to be done ... */
7544 if (mddev
->pers
->sync_request
) {
7545 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7546 /* We are adding a device or devices to an array
7547 * which has the bitmap stored on all devices.
7548 * So make sure all bitmap pages get written
7550 bitmap_write_all(mddev
->bitmap
);
7552 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7555 if (!mddev
->sync_thread
) {
7556 printk(KERN_ERR
"%s: could not start resync"
7559 /* leave the spares where they are, it shouldn't hurt */
7560 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7561 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7562 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7563 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7564 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7566 md_wakeup_thread(mddev
->sync_thread
);
7567 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7568 md_new_event(mddev
);
7571 if (!mddev
->sync_thread
) {
7572 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7573 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7575 if (mddev
->sysfs_action
)
7576 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7578 mddev_unlock(mddev
);
7582 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7584 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7585 wait_event_timeout(rdev
->blocked_wait
,
7586 !test_bit(Blocked
, &rdev
->flags
) &&
7587 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7588 msecs_to_jiffies(5000));
7589 rdev_dec_pending(rdev
, mddev
);
7591 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7594 /* Bad block management.
7595 * We can record which blocks on each device are 'bad' and so just
7596 * fail those blocks, or that stripe, rather than the whole device.
7597 * Entries in the bad-block table are 64bits wide. This comprises:
7598 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7599 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7600 * A 'shift' can be set so that larger blocks are tracked and
7601 * consequently larger devices can be covered.
7602 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7604 * Locking of the bad-block table uses a seqlock so md_is_badblock
7605 * might need to retry if it is very unlucky.
7606 * We will sometimes want to check for bad blocks in a bi_end_io function,
7607 * so we use the write_seqlock_irq variant.
7609 * When looking for a bad block we specify a range and want to
7610 * know if any block in the range is bad. So we binary-search
7611 * to the last range that starts at-or-before the given endpoint,
7612 * (or "before the sector after the target range")
7613 * then see if it ends after the given start.
7615 * 0 if there are no known bad blocks in the range
7616 * 1 if there are known bad block which are all acknowledged
7617 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7618 * plus the start/length of the first bad section we overlap.
7620 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7621 sector_t
*first_bad
, int *bad_sectors
)
7627 sector_t target
= s
+ sectors
;
7630 if (bb
->shift
> 0) {
7631 /* round the start down, and the end up */
7633 target
+= (1<<bb
->shift
) - 1;
7634 target
>>= bb
->shift
;
7635 sectors
= target
- s
;
7637 /* 'target' is now the first block after the bad range */
7640 seq
= read_seqbegin(&bb
->lock
);
7644 /* Binary search between lo and hi for 'target'
7645 * i.e. for the last range that starts before 'target'
7647 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7648 * are known not to be the last range before target.
7649 * VARIANT: hi-lo is the number of possible
7650 * ranges, and decreases until it reaches 1
7652 while (hi
- lo
> 1) {
7653 int mid
= (lo
+ hi
) / 2;
7654 sector_t a
= BB_OFFSET(p
[mid
]);
7656 /* This could still be the one, earlier ranges
7660 /* This and later ranges are definitely out. */
7663 /* 'lo' might be the last that started before target, but 'hi' isn't */
7665 /* need to check all range that end after 's' to see if
7666 * any are unacknowledged.
7669 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7670 if (BB_OFFSET(p
[lo
]) < target
) {
7671 /* starts before the end, and finishes after
7672 * the start, so they must overlap
7674 if (rv
!= -1 && BB_ACK(p
[lo
]))
7678 *first_bad
= BB_OFFSET(p
[lo
]);
7679 *bad_sectors
= BB_LEN(p
[lo
]);
7685 if (read_seqretry(&bb
->lock
, seq
))
7690 EXPORT_SYMBOL_GPL(md_is_badblock
);
7693 * Add a range of bad blocks to the table.
7694 * This might extend the table, or might contract it
7695 * if two adjacent ranges can be merged.
7696 * We binary-search to find the 'insertion' point, then
7697 * decide how best to handle it.
7699 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
7707 /* badblocks are disabled */
7711 /* round the start down, and the end up */
7712 sector_t next
= s
+ sectors
;
7714 next
+= (1<<bb
->shift
) - 1;
7719 write_seqlock_irq(&bb
->lock
);
7724 /* Find the last range that starts at-or-before 's' */
7725 while (hi
- lo
> 1) {
7726 int mid
= (lo
+ hi
) / 2;
7727 sector_t a
= BB_OFFSET(p
[mid
]);
7733 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
7737 /* we found a range that might merge with the start
7740 sector_t a
= BB_OFFSET(p
[lo
]);
7741 sector_t e
= a
+ BB_LEN(p
[lo
]);
7742 int ack
= BB_ACK(p
[lo
]);
7744 /* Yes, we can merge with a previous range */
7745 if (s
== a
&& s
+ sectors
>= e
)
7746 /* new range covers old */
7749 ack
= ack
&& acknowledged
;
7751 if (e
< s
+ sectors
)
7753 if (e
- a
<= BB_MAX_LEN
) {
7754 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
7757 /* does not all fit in one range,
7758 * make p[lo] maximal
7760 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
7761 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
7767 if (sectors
&& hi
< bb
->count
) {
7768 /* 'hi' points to the first range that starts after 's'.
7769 * Maybe we can merge with the start of that range */
7770 sector_t a
= BB_OFFSET(p
[hi
]);
7771 sector_t e
= a
+ BB_LEN(p
[hi
]);
7772 int ack
= BB_ACK(p
[hi
]);
7773 if (a
<= s
+ sectors
) {
7774 /* merging is possible */
7775 if (e
<= s
+ sectors
) {
7780 ack
= ack
&& acknowledged
;
7783 if (e
- a
<= BB_MAX_LEN
) {
7784 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
7787 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
7795 if (sectors
== 0 && hi
< bb
->count
) {
7796 /* we might be able to combine lo and hi */
7797 /* Note: 's' is at the end of 'lo' */
7798 sector_t a
= BB_OFFSET(p
[hi
]);
7799 int lolen
= BB_LEN(p
[lo
]);
7800 int hilen
= BB_LEN(p
[hi
]);
7801 int newlen
= lolen
+ hilen
- (s
- a
);
7802 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
7803 /* yes, we can combine them */
7804 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
7805 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
7806 memmove(p
+ hi
, p
+ hi
+ 1,
7807 (bb
->count
- hi
- 1) * 8);
7812 /* didn't merge (it all).
7813 * Need to add a range just before 'hi' */
7814 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
7815 /* No room for more */
7819 int this_sectors
= sectors
;
7820 memmove(p
+ hi
+ 1, p
+ hi
,
7821 (bb
->count
- hi
) * 8);
7824 if (this_sectors
> BB_MAX_LEN
)
7825 this_sectors
= BB_MAX_LEN
;
7826 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
7827 sectors
-= this_sectors
;
7834 bb
->unacked_exist
= 1;
7835 write_sequnlock_irq(&bb
->lock
);
7840 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
7843 int rv
= md_set_badblocks(&rdev
->badblocks
,
7844 s
+ rdev
->data_offset
, sectors
, acknowledged
);
7846 /* Make sure they get written out promptly */
7847 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
7848 md_wakeup_thread(rdev
->mddev
->thread
);
7852 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
7855 * Remove a range of bad blocks from the table.
7856 * This may involve extending the table if we spilt a region,
7857 * but it must not fail. So if the table becomes full, we just
7858 * drop the remove request.
7860 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
7864 sector_t target
= s
+ sectors
;
7867 if (bb
->shift
> 0) {
7868 /* When clearing we round the start up and the end down.
7869 * This should not matter as the shift should align with
7870 * the block size and no rounding should ever be needed.
7871 * However it is better the think a block is bad when it
7872 * isn't than to think a block is not bad when it is.
7874 s
+= (1<<bb
->shift
) - 1;
7876 target
>>= bb
->shift
;
7877 sectors
= target
- s
;
7880 write_seqlock_irq(&bb
->lock
);
7885 /* Find the last range that starts before 'target' */
7886 while (hi
- lo
> 1) {
7887 int mid
= (lo
+ hi
) / 2;
7888 sector_t a
= BB_OFFSET(p
[mid
]);
7895 /* p[lo] is the last range that could overlap the
7896 * current range. Earlier ranges could also overlap,
7897 * but only this one can overlap the end of the range.
7899 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
7900 /* Partial overlap, leave the tail of this range */
7901 int ack
= BB_ACK(p
[lo
]);
7902 sector_t a
= BB_OFFSET(p
[lo
]);
7903 sector_t end
= a
+ BB_LEN(p
[lo
]);
7906 /* we need to split this range */
7907 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
7911 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
7913 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
7916 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
7917 /* there is no longer an overlap */
7922 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7923 /* This range does overlap */
7924 if (BB_OFFSET(p
[lo
]) < s
) {
7925 /* Keep the early parts of this range. */
7926 int ack
= BB_ACK(p
[lo
]);
7927 sector_t start
= BB_OFFSET(p
[lo
]);
7928 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
7929 /* now low doesn't overlap, so.. */
7934 /* 'lo' is strictly before, 'hi' is strictly after,
7935 * anything between needs to be discarded
7938 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
7939 bb
->count
-= (hi
- lo
- 1);
7945 write_sequnlock_irq(&bb
->lock
);
7949 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
)
7951 return md_clear_badblocks(&rdev
->badblocks
,
7952 s
+ rdev
->data_offset
,
7955 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
7958 * Acknowledge all bad blocks in a list.
7959 * This only succeeds if ->changed is clear. It is used by
7960 * in-kernel metadata updates
7962 void md_ack_all_badblocks(struct badblocks
*bb
)
7964 if (bb
->page
== NULL
|| bb
->changed
)
7965 /* no point even trying */
7967 write_seqlock_irq(&bb
->lock
);
7969 if (bb
->changed
== 0) {
7972 for (i
= 0; i
< bb
->count
; i
++) {
7973 if (!BB_ACK(p
[i
])) {
7974 sector_t start
= BB_OFFSET(p
[i
]);
7975 int len
= BB_LEN(p
[i
]);
7976 p
[i
] = BB_MAKE(start
, len
, 1);
7979 bb
->unacked_exist
= 0;
7981 write_sequnlock_irq(&bb
->lock
);
7983 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
7985 /* sysfs access to bad-blocks list.
7986 * We present two files.
7987 * 'bad-blocks' lists sector numbers and lengths of ranges that
7988 * are recorded as bad. The list is truncated to fit within
7989 * the one-page limit of sysfs.
7990 * Writing "sector length" to this file adds an acknowledged
7992 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
7993 * been acknowledged. Writing to this file adds bad blocks
7994 * without acknowledging them. This is largely for testing.
7998 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8009 seq
= read_seqbegin(&bb
->lock
);
8014 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8015 sector_t s
= BB_OFFSET(p
[i
]);
8016 unsigned int length
= BB_LEN(p
[i
]);
8017 int ack
= BB_ACK(p
[i
]);
8023 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8024 (unsigned long long)s
<< bb
->shift
,
8025 length
<< bb
->shift
);
8027 if (unack
&& len
== 0)
8028 bb
->unacked_exist
= 0;
8030 if (read_seqretry(&bb
->lock
, seq
))
8039 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8041 unsigned long long sector
;
8045 /* Allow clearing via sysfs *only* for testing/debugging.
8046 * Normally only a successful write may clear a badblock
8049 if (page
[0] == '-') {
8053 #endif /* DO_DEBUG */
8055 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8057 if (newline
!= '\n')
8069 md_clear_badblocks(bb
, sector
, length
);
8072 #endif /* DO_DEBUG */
8073 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8079 static int md_notify_reboot(struct notifier_block
*this,
8080 unsigned long code
, void *x
)
8082 struct list_head
*tmp
;
8083 struct mddev
*mddev
;
8086 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
8088 printk(KERN_INFO
"md: stopping all md devices.\n");
8090 for_each_mddev(mddev
, tmp
) {
8091 if (mddev_trylock(mddev
)) {
8092 /* Force a switch to readonly even array
8093 * appears to still be in use. Hence
8096 md_set_readonly(mddev
, 100);
8097 mddev_unlock(mddev
);
8102 * certain more exotic SCSI devices are known to be
8103 * volatile wrt too early system reboots. While the
8104 * right place to handle this issue is the given
8105 * driver, we do want to have a safe RAID driver ...
8113 static struct notifier_block md_notifier
= {
8114 .notifier_call
= md_notify_reboot
,
8116 .priority
= INT_MAX
, /* before any real devices */
8119 static void md_geninit(void)
8121 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8123 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8126 static int __init
md_init(void)
8130 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8134 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8138 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8141 if ((ret
= register_blkdev(0, "mdp")) < 0)
8145 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8146 md_probe
, NULL
, NULL
);
8147 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8148 md_probe
, NULL
, NULL
);
8150 register_reboot_notifier(&md_notifier
);
8151 raid_table_header
= register_sysctl_table(raid_root_table
);
8157 unregister_blkdev(MD_MAJOR
, "md");
8159 destroy_workqueue(md_misc_wq
);
8161 destroy_workqueue(md_wq
);
8169 * Searches all registered partitions for autorun RAID arrays
8173 static LIST_HEAD(all_detected_devices
);
8174 struct detected_devices_node
{
8175 struct list_head list
;
8179 void md_autodetect_dev(dev_t dev
)
8181 struct detected_devices_node
*node_detected_dev
;
8183 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8184 if (node_detected_dev
) {
8185 node_detected_dev
->dev
= dev
;
8186 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8188 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8189 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8194 static void autostart_arrays(int part
)
8196 struct md_rdev
*rdev
;
8197 struct detected_devices_node
*node_detected_dev
;
8199 int i_scanned
, i_passed
;
8204 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8206 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8208 node_detected_dev
= list_entry(all_detected_devices
.next
,
8209 struct detected_devices_node
, list
);
8210 list_del(&node_detected_dev
->list
);
8211 dev
= node_detected_dev
->dev
;
8212 kfree(node_detected_dev
);
8213 rdev
= md_import_device(dev
,0, 90);
8217 if (test_bit(Faulty
, &rdev
->flags
)) {
8221 set_bit(AutoDetected
, &rdev
->flags
);
8222 list_add(&rdev
->same_set
, &pending_raid_disks
);
8226 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8227 i_scanned
, i_passed
);
8229 autorun_devices(part
);
8232 #endif /* !MODULE */
8234 static __exit
void md_exit(void)
8236 struct mddev
*mddev
;
8237 struct list_head
*tmp
;
8239 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8240 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8242 unregister_blkdev(MD_MAJOR
,"md");
8243 unregister_blkdev(mdp_major
, "mdp");
8244 unregister_reboot_notifier(&md_notifier
);
8245 unregister_sysctl_table(raid_table_header
);
8246 remove_proc_entry("mdstat", NULL
);
8247 for_each_mddev(mddev
, tmp
) {
8248 export_array(mddev
);
8249 mddev
->hold_active
= 0;
8251 destroy_workqueue(md_misc_wq
);
8252 destroy_workqueue(md_wq
);
8255 subsys_initcall(md_init
);
8256 module_exit(md_exit
)
8258 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8260 return sprintf(buffer
, "%d", start_readonly
);
8262 static int set_ro(const char *val
, struct kernel_param
*kp
)
8265 int num
= simple_strtoul(val
, &e
, 10);
8266 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8267 start_readonly
= num
;
8273 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8274 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8276 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8278 EXPORT_SYMBOL(register_md_personality
);
8279 EXPORT_SYMBOL(unregister_md_personality
);
8280 EXPORT_SYMBOL(md_error
);
8281 EXPORT_SYMBOL(md_done_sync
);
8282 EXPORT_SYMBOL(md_write_start
);
8283 EXPORT_SYMBOL(md_write_end
);
8284 EXPORT_SYMBOL(md_register_thread
);
8285 EXPORT_SYMBOL(md_unregister_thread
);
8286 EXPORT_SYMBOL(md_wakeup_thread
);
8287 EXPORT_SYMBOL(md_check_recovery
);
8288 MODULE_LICENSE("GPL");
8289 MODULE_DESCRIPTION("MD RAID framework");
8291 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);