2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
56 #include "md-cluster.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 struct md_cluster_operations
*md_cluster_ops
;
71 struct module
*md_cluster_mod
;
72 EXPORT_SYMBOL(md_cluster_mod
);
74 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
75 static struct workqueue_struct
*md_wq
;
76 static struct workqueue_struct
*md_misc_wq
;
78 static int remove_and_add_spares(struct mddev
*mddev
,
79 struct md_rdev
*this);
80 static void mddev_detach(struct mddev
*mddev
);
83 * Default number of read corrections we'll attempt on an rdev
84 * before ejecting it from the array. We divide the read error
85 * count by 2 for every hour elapsed between read errors.
87 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
89 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
90 * is 1000 KB/sec, so the extra system load does not show up that much.
91 * Increase it if you want to have more _guaranteed_ speed. Note that
92 * the RAID driver will use the maximum available bandwidth if the IO
93 * subsystem is idle. There is also an 'absolute maximum' reconstruction
94 * speed limit - in case reconstruction slows down your system despite
97 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
98 * or /sys/block/mdX/md/sync_speed_{min,max}
101 static int sysctl_speed_limit_min
= 1000;
102 static int sysctl_speed_limit_max
= 200000;
103 static inline int speed_min(struct mddev
*mddev
)
105 return mddev
->sync_speed_min
?
106 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
109 static inline int speed_max(struct mddev
*mddev
)
111 return mddev
->sync_speed_max
?
112 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
115 static struct ctl_table_header
*raid_table_header
;
117 static struct ctl_table raid_table
[] = {
119 .procname
= "speed_limit_min",
120 .data
= &sysctl_speed_limit_min
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= proc_dointvec
,
126 .procname
= "speed_limit_max",
127 .data
= &sysctl_speed_limit_max
,
128 .maxlen
= sizeof(int),
129 .mode
= S_IRUGO
|S_IWUSR
,
130 .proc_handler
= proc_dointvec
,
135 static struct ctl_table raid_dir_table
[] = {
139 .mode
= S_IRUGO
|S_IXUGO
,
145 static struct ctl_table raid_root_table
[] = {
150 .child
= raid_dir_table
,
155 static const struct block_device_operations md_fops
;
157 static int start_readonly
;
160 * like bio_clone, but with a local bio set
163 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
168 if (!mddev
|| !mddev
->bio_set
)
169 return bio_alloc(gfp_mask
, nr_iovecs
);
171 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
176 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
178 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
181 if (!mddev
|| !mddev
->bio_set
)
182 return bio_clone(bio
, gfp_mask
);
184 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
186 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
189 * We have a system wide 'event count' that is incremented
190 * on any 'interesting' event, and readers of /proc/mdstat
191 * can use 'poll' or 'select' to find out when the event
195 * start array, stop array, error, add device, remove device,
196 * start build, activate spare
198 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
199 static atomic_t md_event_count
;
200 void md_new_event(struct mddev
*mddev
)
202 atomic_inc(&md_event_count
);
203 wake_up(&md_event_waiters
);
205 EXPORT_SYMBOL_GPL(md_new_event
);
207 /* Alternate version that can be called from interrupts
208 * when calling sysfs_notify isn't needed.
210 static void md_new_event_inintr(struct mddev
*mddev
)
212 atomic_inc(&md_event_count
);
213 wake_up(&md_event_waiters
);
217 * Enables to iterate over all existing md arrays
218 * all_mddevs_lock protects this list.
220 static LIST_HEAD(all_mddevs
);
221 static DEFINE_SPINLOCK(all_mddevs_lock
);
224 * iterates through all used mddevs in the system.
225 * We take care to grab the all_mddevs_lock whenever navigating
226 * the list, and to always hold a refcount when unlocked.
227 * Any code which breaks out of this loop while own
228 * a reference to the current mddev and must mddev_put it.
230 #define for_each_mddev(_mddev,_tmp) \
232 for (({ spin_lock(&all_mddevs_lock); \
233 _tmp = all_mddevs.next; \
235 ({ if (_tmp != &all_mddevs) \
236 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
237 spin_unlock(&all_mddevs_lock); \
238 if (_mddev) mddev_put(_mddev); \
239 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
240 _tmp != &all_mddevs;}); \
241 ({ spin_lock(&all_mddevs_lock); \
242 _tmp = _tmp->next;}) \
245 /* Rather than calling directly into the personality make_request function,
246 * IO requests come here first so that we can check if the device is
247 * being suspended pending a reconfiguration.
248 * We hold a refcount over the call to ->make_request. By the time that
249 * call has finished, the bio has been linked into some internal structure
250 * and so is visible to ->quiesce(), so we don't need the refcount any more.
252 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
254 const int rw
= bio_data_dir(bio
);
255 struct mddev
*mddev
= q
->queuedata
;
256 unsigned int sectors
;
258 if (mddev
== NULL
|| mddev
->pers
== NULL
263 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
264 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
267 smp_rmb(); /* Ensure implications of 'active' are visible */
269 if (mddev
->suspended
) {
272 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
273 TASK_UNINTERRUPTIBLE
);
274 if (!mddev
->suspended
)
280 finish_wait(&mddev
->sb_wait
, &__wait
);
282 atomic_inc(&mddev
->active_io
);
286 * save the sectors now since our bio can
287 * go away inside make_request
289 sectors
= bio_sectors(bio
);
290 mddev
->pers
->make_request(mddev
, bio
);
292 generic_start_io_acct(rw
, sectors
, &mddev
->gendisk
->part0
);
294 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
295 wake_up(&mddev
->sb_wait
);
298 /* mddev_suspend makes sure no new requests are submitted
299 * to the device, and that any requests that have been submitted
300 * are completely handled.
301 * Once mddev_detach() is called and completes, the module will be
304 void mddev_suspend(struct mddev
*mddev
)
306 BUG_ON(mddev
->suspended
);
307 mddev
->suspended
= 1;
309 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
310 mddev
->pers
->quiesce(mddev
, 1);
312 del_timer_sync(&mddev
->safemode_timer
);
314 EXPORT_SYMBOL_GPL(mddev_suspend
);
316 void mddev_resume(struct mddev
*mddev
)
318 mddev
->suspended
= 0;
319 wake_up(&mddev
->sb_wait
);
320 mddev
->pers
->quiesce(mddev
, 0);
322 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
323 md_wakeup_thread(mddev
->thread
);
324 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
326 EXPORT_SYMBOL_GPL(mddev_resume
);
328 int mddev_congested(struct mddev
*mddev
, int bits
)
330 struct md_personality
*pers
= mddev
->pers
;
334 if (mddev
->suspended
)
336 else if (pers
&& pers
->congested
)
337 ret
= pers
->congested(mddev
, bits
);
341 EXPORT_SYMBOL_GPL(mddev_congested
);
342 static int md_congested(void *data
, int bits
)
344 struct mddev
*mddev
= data
;
345 return mddev_congested(mddev
, bits
);
348 static int md_mergeable_bvec(struct request_queue
*q
,
349 struct bvec_merge_data
*bvm
,
350 struct bio_vec
*biovec
)
352 struct mddev
*mddev
= q
->queuedata
;
355 if (mddev
->suspended
) {
356 /* Must always allow one vec */
357 if (bvm
->bi_size
== 0)
358 ret
= biovec
->bv_len
;
362 struct md_personality
*pers
= mddev
->pers
;
363 if (pers
&& pers
->mergeable_bvec
)
364 ret
= pers
->mergeable_bvec(mddev
, bvm
, biovec
);
366 ret
= biovec
->bv_len
;
372 * Generic flush handling for md
375 static void md_end_flush(struct bio
*bio
, int err
)
377 struct md_rdev
*rdev
= bio
->bi_private
;
378 struct mddev
*mddev
= rdev
->mddev
;
380 rdev_dec_pending(rdev
, mddev
);
382 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
383 /* The pre-request flush has finished */
384 queue_work(md_wq
, &mddev
->flush_work
);
389 static void md_submit_flush_data(struct work_struct
*ws
);
391 static void submit_flushes(struct work_struct
*ws
)
393 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
394 struct md_rdev
*rdev
;
396 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
397 atomic_set(&mddev
->flush_pending
, 1);
399 rdev_for_each_rcu(rdev
, mddev
)
400 if (rdev
->raid_disk
>= 0 &&
401 !test_bit(Faulty
, &rdev
->flags
)) {
402 /* Take two references, one is dropped
403 * when request finishes, one after
404 * we reclaim rcu_read_lock
407 atomic_inc(&rdev
->nr_pending
);
408 atomic_inc(&rdev
->nr_pending
);
410 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
411 bi
->bi_end_io
= md_end_flush
;
412 bi
->bi_private
= rdev
;
413 bi
->bi_bdev
= rdev
->bdev
;
414 atomic_inc(&mddev
->flush_pending
);
415 submit_bio(WRITE_FLUSH
, bi
);
417 rdev_dec_pending(rdev
, mddev
);
420 if (atomic_dec_and_test(&mddev
->flush_pending
))
421 queue_work(md_wq
, &mddev
->flush_work
);
424 static void md_submit_flush_data(struct work_struct
*ws
)
426 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
427 struct bio
*bio
= mddev
->flush_bio
;
429 if (bio
->bi_iter
.bi_size
== 0)
430 /* an empty barrier - all done */
433 bio
->bi_rw
&= ~REQ_FLUSH
;
434 mddev
->pers
->make_request(mddev
, bio
);
437 mddev
->flush_bio
= NULL
;
438 wake_up(&mddev
->sb_wait
);
441 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
443 spin_lock_irq(&mddev
->lock
);
444 wait_event_lock_irq(mddev
->sb_wait
,
447 mddev
->flush_bio
= bio
;
448 spin_unlock_irq(&mddev
->lock
);
450 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
451 queue_work(md_wq
, &mddev
->flush_work
);
453 EXPORT_SYMBOL(md_flush_request
);
455 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
457 struct mddev
*mddev
= cb
->data
;
458 md_wakeup_thread(mddev
->thread
);
461 EXPORT_SYMBOL(md_unplug
);
463 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
465 atomic_inc(&mddev
->active
);
469 static void mddev_delayed_delete(struct work_struct
*ws
);
471 static void mddev_put(struct mddev
*mddev
)
473 struct bio_set
*bs
= NULL
;
475 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
477 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
478 mddev
->ctime
== 0 && !mddev
->hold_active
) {
479 /* Array is not configured at all, and not held active,
481 list_del_init(&mddev
->all_mddevs
);
483 mddev
->bio_set
= NULL
;
484 if (mddev
->gendisk
) {
485 /* We did a probe so need to clean up. Call
486 * queue_work inside the spinlock so that
487 * flush_workqueue() after mddev_find will
488 * succeed in waiting for the work to be done.
490 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
491 queue_work(md_misc_wq
, &mddev
->del_work
);
495 spin_unlock(&all_mddevs_lock
);
500 void mddev_init(struct mddev
*mddev
)
502 mutex_init(&mddev
->open_mutex
);
503 mutex_init(&mddev
->reconfig_mutex
);
504 mutex_init(&mddev
->bitmap_info
.mutex
);
505 INIT_LIST_HEAD(&mddev
->disks
);
506 INIT_LIST_HEAD(&mddev
->all_mddevs
);
507 init_timer(&mddev
->safemode_timer
);
508 atomic_set(&mddev
->active
, 1);
509 atomic_set(&mddev
->openers
, 0);
510 atomic_set(&mddev
->active_io
, 0);
511 spin_lock_init(&mddev
->lock
);
512 atomic_set(&mddev
->flush_pending
, 0);
513 init_waitqueue_head(&mddev
->sb_wait
);
514 init_waitqueue_head(&mddev
->recovery_wait
);
515 mddev
->reshape_position
= MaxSector
;
516 mddev
->reshape_backwards
= 0;
517 mddev
->last_sync_action
= "none";
518 mddev
->resync_min
= 0;
519 mddev
->resync_max
= MaxSector
;
520 mddev
->level
= LEVEL_NONE
;
522 EXPORT_SYMBOL_GPL(mddev_init
);
524 static struct mddev
*mddev_find(dev_t unit
)
526 struct mddev
*mddev
, *new = NULL
;
528 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
529 unit
&= ~((1<<MdpMinorShift
)-1);
532 spin_lock(&all_mddevs_lock
);
535 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
536 if (mddev
->unit
== unit
) {
538 spin_unlock(&all_mddevs_lock
);
544 list_add(&new->all_mddevs
, &all_mddevs
);
545 spin_unlock(&all_mddevs_lock
);
546 new->hold_active
= UNTIL_IOCTL
;
550 /* find an unused unit number */
551 static int next_minor
= 512;
552 int start
= next_minor
;
556 dev
= MKDEV(MD_MAJOR
, next_minor
);
558 if (next_minor
> MINORMASK
)
560 if (next_minor
== start
) {
561 /* Oh dear, all in use. */
562 spin_unlock(&all_mddevs_lock
);
568 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
569 if (mddev
->unit
== dev
) {
575 new->md_minor
= MINOR(dev
);
576 new->hold_active
= UNTIL_STOP
;
577 list_add(&new->all_mddevs
, &all_mddevs
);
578 spin_unlock(&all_mddevs_lock
);
581 spin_unlock(&all_mddevs_lock
);
583 new = kzalloc(sizeof(*new), GFP_KERNEL
);
588 if (MAJOR(unit
) == MD_MAJOR
)
589 new->md_minor
= MINOR(unit
);
591 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
598 static struct attribute_group md_redundancy_group
;
600 void mddev_unlock(struct mddev
*mddev
)
602 if (mddev
->to_remove
) {
603 /* These cannot be removed under reconfig_mutex as
604 * an access to the files will try to take reconfig_mutex
605 * while holding the file unremovable, which leads to
607 * So hold set sysfs_active while the remove in happeing,
608 * and anything else which might set ->to_remove or my
609 * otherwise change the sysfs namespace will fail with
610 * -EBUSY if sysfs_active is still set.
611 * We set sysfs_active under reconfig_mutex and elsewhere
612 * test it under the same mutex to ensure its correct value
615 struct attribute_group
*to_remove
= mddev
->to_remove
;
616 mddev
->to_remove
= NULL
;
617 mddev
->sysfs_active
= 1;
618 mutex_unlock(&mddev
->reconfig_mutex
);
620 if (mddev
->kobj
.sd
) {
621 if (to_remove
!= &md_redundancy_group
)
622 sysfs_remove_group(&mddev
->kobj
, to_remove
);
623 if (mddev
->pers
== NULL
||
624 mddev
->pers
->sync_request
== NULL
) {
625 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
626 if (mddev
->sysfs_action
)
627 sysfs_put(mddev
->sysfs_action
);
628 mddev
->sysfs_action
= NULL
;
631 mddev
->sysfs_active
= 0;
633 mutex_unlock(&mddev
->reconfig_mutex
);
635 /* As we've dropped the mutex we need a spinlock to
636 * make sure the thread doesn't disappear
638 spin_lock(&pers_lock
);
639 md_wakeup_thread(mddev
->thread
);
640 spin_unlock(&pers_lock
);
642 EXPORT_SYMBOL_GPL(mddev_unlock
);
644 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
646 struct md_rdev
*rdev
;
648 rdev_for_each_rcu(rdev
, mddev
)
649 if (rdev
->desc_nr
== nr
)
655 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
657 struct md_rdev
*rdev
;
659 rdev_for_each(rdev
, mddev
)
660 if (rdev
->bdev
->bd_dev
== dev
)
666 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
668 struct md_rdev
*rdev
;
670 rdev_for_each_rcu(rdev
, mddev
)
671 if (rdev
->bdev
->bd_dev
== dev
)
677 static struct md_personality
*find_pers(int level
, char *clevel
)
679 struct md_personality
*pers
;
680 list_for_each_entry(pers
, &pers_list
, list
) {
681 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
683 if (strcmp(pers
->name
, clevel
)==0)
689 /* return the offset of the super block in 512byte sectors */
690 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
692 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
693 return MD_NEW_SIZE_SECTORS(num_sectors
);
696 static int alloc_disk_sb(struct md_rdev
*rdev
)
698 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
699 if (!rdev
->sb_page
) {
700 printk(KERN_ALERT
"md: out of memory.\n");
707 void md_rdev_clear(struct md_rdev
*rdev
)
710 put_page(rdev
->sb_page
);
712 rdev
->sb_page
= NULL
;
717 put_page(rdev
->bb_page
);
718 rdev
->bb_page
= NULL
;
720 kfree(rdev
->badblocks
.page
);
721 rdev
->badblocks
.page
= NULL
;
723 EXPORT_SYMBOL_GPL(md_rdev_clear
);
725 static void super_written(struct bio
*bio
, int error
)
727 struct md_rdev
*rdev
= bio
->bi_private
;
728 struct mddev
*mddev
= rdev
->mddev
;
730 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
731 printk("md: super_written gets error=%d, uptodate=%d\n",
732 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
733 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
734 md_error(mddev
, rdev
);
737 if (atomic_dec_and_test(&mddev
->pending_writes
))
738 wake_up(&mddev
->sb_wait
);
742 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
743 sector_t sector
, int size
, struct page
*page
)
745 /* write first size bytes of page to sector of rdev
746 * Increment mddev->pending_writes before returning
747 * and decrement it on completion, waking up sb_wait
748 * if zero is reached.
749 * If an error occurred, call md_error
751 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
753 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
754 bio
->bi_iter
.bi_sector
= sector
;
755 bio_add_page(bio
, page
, size
, 0);
756 bio
->bi_private
= rdev
;
757 bio
->bi_end_io
= super_written
;
759 atomic_inc(&mddev
->pending_writes
);
760 submit_bio(WRITE_FLUSH_FUA
, bio
);
763 void md_super_wait(struct mddev
*mddev
)
765 /* wait for all superblock writes that were scheduled to complete */
766 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
769 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
770 struct page
*page
, int rw
, bool metadata_op
)
772 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
775 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
776 rdev
->meta_bdev
: rdev
->bdev
;
778 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
779 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
780 (rdev
->mddev
->reshape_backwards
==
781 (sector
>= rdev
->mddev
->reshape_position
)))
782 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
784 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
785 bio_add_page(bio
, page
, size
, 0);
786 submit_bio_wait(rw
, bio
);
788 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
792 EXPORT_SYMBOL_GPL(sync_page_io
);
794 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
796 char b
[BDEVNAME_SIZE
];
801 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
807 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
808 bdevname(rdev
->bdev
,b
));
812 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
814 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
815 sb1
->set_uuid1
== sb2
->set_uuid1
&&
816 sb1
->set_uuid2
== sb2
->set_uuid2
&&
817 sb1
->set_uuid3
== sb2
->set_uuid3
;
820 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
823 mdp_super_t
*tmp1
, *tmp2
;
825 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
826 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
828 if (!tmp1
|| !tmp2
) {
830 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
838 * nr_disks is not constant
843 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
850 static u32
md_csum_fold(u32 csum
)
852 csum
= (csum
& 0xffff) + (csum
>> 16);
853 return (csum
& 0xffff) + (csum
>> 16);
856 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
859 u32
*sb32
= (u32
*)sb
;
861 unsigned int disk_csum
, csum
;
863 disk_csum
= sb
->sb_csum
;
866 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
868 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
871 /* This used to use csum_partial, which was wrong for several
872 * reasons including that different results are returned on
873 * different architectures. It isn't critical that we get exactly
874 * the same return value as before (we always csum_fold before
875 * testing, and that removes any differences). However as we
876 * know that csum_partial always returned a 16bit value on
877 * alphas, do a fold to maximise conformity to previous behaviour.
879 sb
->sb_csum
= md_csum_fold(disk_csum
);
881 sb
->sb_csum
= disk_csum
;
887 * Handle superblock details.
888 * We want to be able to handle multiple superblock formats
889 * so we have a common interface to them all, and an array of
890 * different handlers.
891 * We rely on user-space to write the initial superblock, and support
892 * reading and updating of superblocks.
893 * Interface methods are:
894 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
895 * loads and validates a superblock on dev.
896 * if refdev != NULL, compare superblocks on both devices
898 * 0 - dev has a superblock that is compatible with refdev
899 * 1 - dev has a superblock that is compatible and newer than refdev
900 * so dev should be used as the refdev in future
901 * -EINVAL superblock incompatible or invalid
902 * -othererror e.g. -EIO
904 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
905 * Verify that dev is acceptable into mddev.
906 * The first time, mddev->raid_disks will be 0, and data from
907 * dev should be merged in. Subsequent calls check that dev
908 * is new enough. Return 0 or -EINVAL
910 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
911 * Update the superblock for rdev with data in mddev
912 * This does not write to disc.
918 struct module
*owner
;
919 int (*load_super
)(struct md_rdev
*rdev
,
920 struct md_rdev
*refdev
,
922 int (*validate_super
)(struct mddev
*mddev
,
923 struct md_rdev
*rdev
);
924 void (*sync_super
)(struct mddev
*mddev
,
925 struct md_rdev
*rdev
);
926 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
927 sector_t num_sectors
);
928 int (*allow_new_offset
)(struct md_rdev
*rdev
,
929 unsigned long long new_offset
);
933 * Check that the given mddev has no bitmap.
935 * This function is called from the run method of all personalities that do not
936 * support bitmaps. It prints an error message and returns non-zero if mddev
937 * has a bitmap. Otherwise, it returns 0.
940 int md_check_no_bitmap(struct mddev
*mddev
)
942 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
944 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
945 mdname(mddev
), mddev
->pers
->name
);
948 EXPORT_SYMBOL(md_check_no_bitmap
);
951 * load_super for 0.90.0
953 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
955 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
960 * Calculate the position of the superblock (512byte sectors),
961 * it's at the end of the disk.
963 * It also happens to be a multiple of 4Kb.
965 rdev
->sb_start
= calc_dev_sboffset(rdev
);
967 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
972 bdevname(rdev
->bdev
, b
);
973 sb
= page_address(rdev
->sb_page
);
975 if (sb
->md_magic
!= MD_SB_MAGIC
) {
976 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
981 if (sb
->major_version
!= 0 ||
982 sb
->minor_version
< 90 ||
983 sb
->minor_version
> 91) {
984 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
985 sb
->major_version
, sb
->minor_version
,
990 if (sb
->raid_disks
<= 0)
993 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
994 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
999 rdev
->preferred_minor
= sb
->md_minor
;
1000 rdev
->data_offset
= 0;
1001 rdev
->new_data_offset
= 0;
1002 rdev
->sb_size
= MD_SB_BYTES
;
1003 rdev
->badblocks
.shift
= -1;
1005 if (sb
->level
== LEVEL_MULTIPATH
)
1008 rdev
->desc_nr
= sb
->this_disk
.number
;
1014 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1015 if (!uuid_equal(refsb
, sb
)) {
1016 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1017 b
, bdevname(refdev
->bdev
,b2
));
1020 if (!sb_equal(refsb
, sb
)) {
1021 printk(KERN_WARNING
"md: %s has same UUID"
1022 " but different superblock to %s\n",
1023 b
, bdevname(refdev
->bdev
, b2
));
1027 ev2
= md_event(refsb
);
1033 rdev
->sectors
= rdev
->sb_start
;
1034 /* Limit to 4TB as metadata cannot record more than that.
1035 * (not needed for Linear and RAID0 as metadata doesn't
1038 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1039 rdev
->sectors
= (2ULL << 32) - 2;
1041 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1042 /* "this cannot possibly happen" ... */
1050 * validate_super for 0.90.0
1052 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1055 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1056 __u64 ev1
= md_event(sb
);
1058 rdev
->raid_disk
= -1;
1059 clear_bit(Faulty
, &rdev
->flags
);
1060 clear_bit(In_sync
, &rdev
->flags
);
1061 clear_bit(Bitmap_sync
, &rdev
->flags
);
1062 clear_bit(WriteMostly
, &rdev
->flags
);
1064 if (mddev
->raid_disks
== 0) {
1065 mddev
->major_version
= 0;
1066 mddev
->minor_version
= sb
->minor_version
;
1067 mddev
->patch_version
= sb
->patch_version
;
1068 mddev
->external
= 0;
1069 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1070 mddev
->ctime
= sb
->ctime
;
1071 mddev
->utime
= sb
->utime
;
1072 mddev
->level
= sb
->level
;
1073 mddev
->clevel
[0] = 0;
1074 mddev
->layout
= sb
->layout
;
1075 mddev
->raid_disks
= sb
->raid_disks
;
1076 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1077 mddev
->events
= ev1
;
1078 mddev
->bitmap_info
.offset
= 0;
1079 mddev
->bitmap_info
.space
= 0;
1080 /* bitmap can use 60 K after the 4K superblocks */
1081 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1082 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1083 mddev
->reshape_backwards
= 0;
1085 if (mddev
->minor_version
>= 91) {
1086 mddev
->reshape_position
= sb
->reshape_position
;
1087 mddev
->delta_disks
= sb
->delta_disks
;
1088 mddev
->new_level
= sb
->new_level
;
1089 mddev
->new_layout
= sb
->new_layout
;
1090 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1091 if (mddev
->delta_disks
< 0)
1092 mddev
->reshape_backwards
= 1;
1094 mddev
->reshape_position
= MaxSector
;
1095 mddev
->delta_disks
= 0;
1096 mddev
->new_level
= mddev
->level
;
1097 mddev
->new_layout
= mddev
->layout
;
1098 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1101 if (sb
->state
& (1<<MD_SB_CLEAN
))
1102 mddev
->recovery_cp
= MaxSector
;
1104 if (sb
->events_hi
== sb
->cp_events_hi
&&
1105 sb
->events_lo
== sb
->cp_events_lo
) {
1106 mddev
->recovery_cp
= sb
->recovery_cp
;
1108 mddev
->recovery_cp
= 0;
1111 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1112 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1113 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1114 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1116 mddev
->max_disks
= MD_SB_DISKS
;
1118 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1119 mddev
->bitmap_info
.file
== NULL
) {
1120 mddev
->bitmap_info
.offset
=
1121 mddev
->bitmap_info
.default_offset
;
1122 mddev
->bitmap_info
.space
=
1123 mddev
->bitmap_info
.default_space
;
1126 } else if (mddev
->pers
== NULL
) {
1127 /* Insist on good event counter while assembling, except
1128 * for spares (which don't need an event count) */
1130 if (sb
->disks
[rdev
->desc_nr
].state
& (
1131 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1132 if (ev1
< mddev
->events
)
1134 } else if (mddev
->bitmap
) {
1135 /* if adding to array with a bitmap, then we can accept an
1136 * older device ... but not too old.
1138 if (ev1
< mddev
->bitmap
->events_cleared
)
1140 if (ev1
< mddev
->events
)
1141 set_bit(Bitmap_sync
, &rdev
->flags
);
1143 if (ev1
< mddev
->events
)
1144 /* just a hot-add of a new device, leave raid_disk at -1 */
1148 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1149 desc
= sb
->disks
+ rdev
->desc_nr
;
1151 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1152 set_bit(Faulty
, &rdev
->flags
);
1153 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1154 desc->raid_disk < mddev->raid_disks */) {
1155 set_bit(In_sync
, &rdev
->flags
);
1156 rdev
->raid_disk
= desc
->raid_disk
;
1157 rdev
->saved_raid_disk
= desc
->raid_disk
;
1158 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1159 /* active but not in sync implies recovery up to
1160 * reshape position. We don't know exactly where
1161 * that is, so set to zero for now */
1162 if (mddev
->minor_version
>= 91) {
1163 rdev
->recovery_offset
= 0;
1164 rdev
->raid_disk
= desc
->raid_disk
;
1167 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1168 set_bit(WriteMostly
, &rdev
->flags
);
1169 } else /* MULTIPATH are always insync */
1170 set_bit(In_sync
, &rdev
->flags
);
1175 * sync_super for 0.90.0
1177 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1180 struct md_rdev
*rdev2
;
1181 int next_spare
= mddev
->raid_disks
;
1183 /* make rdev->sb match mddev data..
1186 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1187 * 3/ any empty disks < next_spare become removed
1189 * disks[0] gets initialised to REMOVED because
1190 * we cannot be sure from other fields if it has
1191 * been initialised or not.
1194 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1196 rdev
->sb_size
= MD_SB_BYTES
;
1198 sb
= page_address(rdev
->sb_page
);
1200 memset(sb
, 0, sizeof(*sb
));
1202 sb
->md_magic
= MD_SB_MAGIC
;
1203 sb
->major_version
= mddev
->major_version
;
1204 sb
->patch_version
= mddev
->patch_version
;
1205 sb
->gvalid_words
= 0; /* ignored */
1206 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1207 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1208 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1209 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1211 sb
->ctime
= mddev
->ctime
;
1212 sb
->level
= mddev
->level
;
1213 sb
->size
= mddev
->dev_sectors
/ 2;
1214 sb
->raid_disks
= mddev
->raid_disks
;
1215 sb
->md_minor
= mddev
->md_minor
;
1216 sb
->not_persistent
= 0;
1217 sb
->utime
= mddev
->utime
;
1219 sb
->events_hi
= (mddev
->events
>>32);
1220 sb
->events_lo
= (u32
)mddev
->events
;
1222 if (mddev
->reshape_position
== MaxSector
)
1223 sb
->minor_version
= 90;
1225 sb
->minor_version
= 91;
1226 sb
->reshape_position
= mddev
->reshape_position
;
1227 sb
->new_level
= mddev
->new_level
;
1228 sb
->delta_disks
= mddev
->delta_disks
;
1229 sb
->new_layout
= mddev
->new_layout
;
1230 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1232 mddev
->minor_version
= sb
->minor_version
;
1235 sb
->recovery_cp
= mddev
->recovery_cp
;
1236 sb
->cp_events_hi
= (mddev
->events
>>32);
1237 sb
->cp_events_lo
= (u32
)mddev
->events
;
1238 if (mddev
->recovery_cp
== MaxSector
)
1239 sb
->state
= (1<< MD_SB_CLEAN
);
1241 sb
->recovery_cp
= 0;
1243 sb
->layout
= mddev
->layout
;
1244 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1246 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1247 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1249 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1250 rdev_for_each(rdev2
, mddev
) {
1253 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1255 if (rdev2
->raid_disk
>= 0 &&
1256 sb
->minor_version
>= 91)
1257 /* we have nowhere to store the recovery_offset,
1258 * but if it is not below the reshape_position,
1259 * we can piggy-back on that.
1262 if (rdev2
->raid_disk
< 0 ||
1263 test_bit(Faulty
, &rdev2
->flags
))
1266 desc_nr
= rdev2
->raid_disk
;
1268 desc_nr
= next_spare
++;
1269 rdev2
->desc_nr
= desc_nr
;
1270 d
= &sb
->disks
[rdev2
->desc_nr
];
1272 d
->number
= rdev2
->desc_nr
;
1273 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1274 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1276 d
->raid_disk
= rdev2
->raid_disk
;
1278 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1279 if (test_bit(Faulty
, &rdev2
->flags
))
1280 d
->state
= (1<<MD_DISK_FAULTY
);
1281 else if (is_active
) {
1282 d
->state
= (1<<MD_DISK_ACTIVE
);
1283 if (test_bit(In_sync
, &rdev2
->flags
))
1284 d
->state
|= (1<<MD_DISK_SYNC
);
1292 if (test_bit(WriteMostly
, &rdev2
->flags
))
1293 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1295 /* now set the "removed" and "faulty" bits on any missing devices */
1296 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1297 mdp_disk_t
*d
= &sb
->disks
[i
];
1298 if (d
->state
== 0 && d
->number
== 0) {
1301 d
->state
= (1<<MD_DISK_REMOVED
);
1302 d
->state
|= (1<<MD_DISK_FAULTY
);
1306 sb
->nr_disks
= nr_disks
;
1307 sb
->active_disks
= active
;
1308 sb
->working_disks
= working
;
1309 sb
->failed_disks
= failed
;
1310 sb
->spare_disks
= spare
;
1312 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1313 sb
->sb_csum
= calc_sb_csum(sb
);
1317 * rdev_size_change for 0.90.0
1319 static unsigned long long
1320 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1322 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1323 return 0; /* component must fit device */
1324 if (rdev
->mddev
->bitmap_info
.offset
)
1325 return 0; /* can't move bitmap */
1326 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1327 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1328 num_sectors
= rdev
->sb_start
;
1329 /* Limit to 4TB as metadata cannot record more than that.
1330 * 4TB == 2^32 KB, or 2*2^32 sectors.
1332 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1333 num_sectors
= (2ULL << 32) - 2;
1334 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1336 md_super_wait(rdev
->mddev
);
1341 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1343 /* non-zero offset changes not possible with v0.90 */
1344 return new_offset
== 0;
1348 * version 1 superblock
1351 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1355 unsigned long long newcsum
;
1356 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1357 __le32
*isuper
= (__le32
*)sb
;
1359 disk_csum
= sb
->sb_csum
;
1362 for (; size
>= 4; size
-= 4)
1363 newcsum
+= le32_to_cpu(*isuper
++);
1366 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1368 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1369 sb
->sb_csum
= disk_csum
;
1370 return cpu_to_le32(csum
);
1373 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1375 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1377 struct mdp_superblock_1
*sb
;
1381 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1385 * Calculate the position of the superblock in 512byte sectors.
1386 * It is always aligned to a 4K boundary and
1387 * depeding on minor_version, it can be:
1388 * 0: At least 8K, but less than 12K, from end of device
1389 * 1: At start of device
1390 * 2: 4K from start of device.
1392 switch(minor_version
) {
1394 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1396 sb_start
&= ~(sector_t
)(4*2-1);
1407 rdev
->sb_start
= sb_start
;
1409 /* superblock is rarely larger than 1K, but it can be larger,
1410 * and it is safe to read 4k, so we do that
1412 ret
= read_disk_sb(rdev
, 4096);
1413 if (ret
) return ret
;
1415 sb
= page_address(rdev
->sb_page
);
1417 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1418 sb
->major_version
!= cpu_to_le32(1) ||
1419 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1420 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1421 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1424 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1425 printk("md: invalid superblock checksum on %s\n",
1426 bdevname(rdev
->bdev
,b
));
1429 if (le64_to_cpu(sb
->data_size
) < 10) {
1430 printk("md: data_size too small on %s\n",
1431 bdevname(rdev
->bdev
,b
));
1436 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1437 /* Some padding is non-zero, might be a new feature */
1440 rdev
->preferred_minor
= 0xffff;
1441 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1442 rdev
->new_data_offset
= rdev
->data_offset
;
1443 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1444 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1445 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1446 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1448 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1449 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1450 if (rdev
->sb_size
& bmask
)
1451 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1454 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1457 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1460 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1463 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1465 if (!rdev
->bb_page
) {
1466 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1470 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1471 rdev
->badblocks
.count
== 0) {
1472 /* need to load the bad block list.
1473 * Currently we limit it to one page.
1479 int sectors
= le16_to_cpu(sb
->bblog_size
);
1480 if (sectors
> (PAGE_SIZE
/ 512))
1482 offset
= le32_to_cpu(sb
->bblog_offset
);
1485 bb_sector
= (long long)offset
;
1486 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1487 rdev
->bb_page
, READ
, true))
1489 bbp
= (u64
*)page_address(rdev
->bb_page
);
1490 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1491 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1492 u64 bb
= le64_to_cpu(*bbp
);
1493 int count
= bb
& (0x3ff);
1494 u64 sector
= bb
>> 10;
1495 sector
<<= sb
->bblog_shift
;
1496 count
<<= sb
->bblog_shift
;
1499 if (md_set_badblocks(&rdev
->badblocks
,
1500 sector
, count
, 1) == 0)
1503 } else if (sb
->bblog_offset
!= 0)
1504 rdev
->badblocks
.shift
= 0;
1510 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1512 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1513 sb
->level
!= refsb
->level
||
1514 sb
->layout
!= refsb
->layout
||
1515 sb
->chunksize
!= refsb
->chunksize
) {
1516 printk(KERN_WARNING
"md: %s has strangely different"
1517 " superblock to %s\n",
1518 bdevname(rdev
->bdev
,b
),
1519 bdevname(refdev
->bdev
,b2
));
1522 ev1
= le64_to_cpu(sb
->events
);
1523 ev2
= le64_to_cpu(refsb
->events
);
1530 if (minor_version
) {
1531 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1532 sectors
-= rdev
->data_offset
;
1534 sectors
= rdev
->sb_start
;
1535 if (sectors
< le64_to_cpu(sb
->data_size
))
1537 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1541 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1543 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1544 __u64 ev1
= le64_to_cpu(sb
->events
);
1546 rdev
->raid_disk
= -1;
1547 clear_bit(Faulty
, &rdev
->flags
);
1548 clear_bit(In_sync
, &rdev
->flags
);
1549 clear_bit(Bitmap_sync
, &rdev
->flags
);
1550 clear_bit(WriteMostly
, &rdev
->flags
);
1552 if (mddev
->raid_disks
== 0) {
1553 mddev
->major_version
= 1;
1554 mddev
->patch_version
= 0;
1555 mddev
->external
= 0;
1556 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1557 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1558 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1559 mddev
->level
= le32_to_cpu(sb
->level
);
1560 mddev
->clevel
[0] = 0;
1561 mddev
->layout
= le32_to_cpu(sb
->layout
);
1562 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1563 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1564 mddev
->events
= ev1
;
1565 mddev
->bitmap_info
.offset
= 0;
1566 mddev
->bitmap_info
.space
= 0;
1567 /* Default location for bitmap is 1K after superblock
1568 * using 3K - total of 4K
1570 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1571 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1572 mddev
->reshape_backwards
= 0;
1574 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1575 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1577 mddev
->max_disks
= (4096-256)/2;
1579 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1580 mddev
->bitmap_info
.file
== NULL
) {
1581 mddev
->bitmap_info
.offset
=
1582 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1583 /* Metadata doesn't record how much space is available.
1584 * For 1.0, we assume we can use up to the superblock
1585 * if before, else to 4K beyond superblock.
1586 * For others, assume no change is possible.
1588 if (mddev
->minor_version
> 0)
1589 mddev
->bitmap_info
.space
= 0;
1590 else if (mddev
->bitmap_info
.offset
> 0)
1591 mddev
->bitmap_info
.space
=
1592 8 - mddev
->bitmap_info
.offset
;
1594 mddev
->bitmap_info
.space
=
1595 -mddev
->bitmap_info
.offset
;
1598 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1599 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1600 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1601 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1602 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1603 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1604 if (mddev
->delta_disks
< 0 ||
1605 (mddev
->delta_disks
== 0 &&
1606 (le32_to_cpu(sb
->feature_map
)
1607 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1608 mddev
->reshape_backwards
= 1;
1610 mddev
->reshape_position
= MaxSector
;
1611 mddev
->delta_disks
= 0;
1612 mddev
->new_level
= mddev
->level
;
1613 mddev
->new_layout
= mddev
->layout
;
1614 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1617 } else if (mddev
->pers
== NULL
) {
1618 /* Insist of good event counter while assembling, except for
1619 * spares (which don't need an event count) */
1621 if (rdev
->desc_nr
>= 0 &&
1622 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1623 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1624 if (ev1
< mddev
->events
)
1626 } else if (mddev
->bitmap
) {
1627 /* If adding to array with a bitmap, then we can accept an
1628 * older device, but not too old.
1630 if (ev1
< mddev
->bitmap
->events_cleared
)
1632 if (ev1
< mddev
->events
)
1633 set_bit(Bitmap_sync
, &rdev
->flags
);
1635 if (ev1
< mddev
->events
)
1636 /* just a hot-add of a new device, leave raid_disk at -1 */
1639 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1641 if (rdev
->desc_nr
< 0 ||
1642 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1646 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1648 case 0xffff: /* spare */
1650 case 0xfffe: /* faulty */
1651 set_bit(Faulty
, &rdev
->flags
);
1654 rdev
->saved_raid_disk
= role
;
1655 if ((le32_to_cpu(sb
->feature_map
) &
1656 MD_FEATURE_RECOVERY_OFFSET
)) {
1657 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1658 if (!(le32_to_cpu(sb
->feature_map
) &
1659 MD_FEATURE_RECOVERY_BITMAP
))
1660 rdev
->saved_raid_disk
= -1;
1662 set_bit(In_sync
, &rdev
->flags
);
1663 rdev
->raid_disk
= role
;
1666 if (sb
->devflags
& WriteMostly1
)
1667 set_bit(WriteMostly
, &rdev
->flags
);
1668 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1669 set_bit(Replacement
, &rdev
->flags
);
1670 } else /* MULTIPATH are always insync */
1671 set_bit(In_sync
, &rdev
->flags
);
1676 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1678 struct mdp_superblock_1
*sb
;
1679 struct md_rdev
*rdev2
;
1681 /* make rdev->sb match mddev and rdev data. */
1683 sb
= page_address(rdev
->sb_page
);
1685 sb
->feature_map
= 0;
1687 sb
->recovery_offset
= cpu_to_le64(0);
1688 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1690 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1691 sb
->events
= cpu_to_le64(mddev
->events
);
1693 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1695 sb
->resync_offset
= cpu_to_le64(0);
1697 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1699 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1700 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1701 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1702 sb
->level
= cpu_to_le32(mddev
->level
);
1703 sb
->layout
= cpu_to_le32(mddev
->layout
);
1705 if (test_bit(WriteMostly
, &rdev
->flags
))
1706 sb
->devflags
|= WriteMostly1
;
1708 sb
->devflags
&= ~WriteMostly1
;
1709 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1710 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1712 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1713 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1714 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1717 if (rdev
->raid_disk
>= 0 &&
1718 !test_bit(In_sync
, &rdev
->flags
)) {
1720 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1721 sb
->recovery_offset
=
1722 cpu_to_le64(rdev
->recovery_offset
);
1723 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1725 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1727 if (test_bit(Replacement
, &rdev
->flags
))
1729 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1731 if (mddev
->reshape_position
!= MaxSector
) {
1732 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1733 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1734 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1735 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1736 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1737 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1738 if (mddev
->delta_disks
== 0 &&
1739 mddev
->reshape_backwards
)
1741 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1742 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1744 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1745 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1746 - rdev
->data_offset
));
1750 if (rdev
->badblocks
.count
== 0)
1751 /* Nothing to do for bad blocks*/ ;
1752 else if (sb
->bblog_offset
== 0)
1753 /* Cannot record bad blocks on this device */
1754 md_error(mddev
, rdev
);
1756 struct badblocks
*bb
= &rdev
->badblocks
;
1757 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1759 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1764 seq
= read_seqbegin(&bb
->lock
);
1766 memset(bbp
, 0xff, PAGE_SIZE
);
1768 for (i
= 0 ; i
< bb
->count
; i
++) {
1769 u64 internal_bb
= p
[i
];
1770 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1771 | BB_LEN(internal_bb
));
1772 bbp
[i
] = cpu_to_le64(store_bb
);
1775 if (read_seqretry(&bb
->lock
, seq
))
1778 bb
->sector
= (rdev
->sb_start
+
1779 (int)le32_to_cpu(sb
->bblog_offset
));
1780 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1785 rdev_for_each(rdev2
, mddev
)
1786 if (rdev2
->desc_nr
+1 > max_dev
)
1787 max_dev
= rdev2
->desc_nr
+1;
1789 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1791 sb
->max_dev
= cpu_to_le32(max_dev
);
1792 rdev
->sb_size
= max_dev
* 2 + 256;
1793 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1794 if (rdev
->sb_size
& bmask
)
1795 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1797 max_dev
= le32_to_cpu(sb
->max_dev
);
1799 for (i
=0; i
<max_dev
;i
++)
1800 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1802 rdev_for_each(rdev2
, mddev
) {
1804 if (test_bit(Faulty
, &rdev2
->flags
))
1805 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1806 else if (test_bit(In_sync
, &rdev2
->flags
))
1807 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1808 else if (rdev2
->raid_disk
>= 0)
1809 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1811 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1814 sb
->sb_csum
= calc_sb_1_csum(sb
);
1817 static unsigned long long
1818 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1820 struct mdp_superblock_1
*sb
;
1821 sector_t max_sectors
;
1822 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1823 return 0; /* component must fit device */
1824 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1825 return 0; /* too confusing */
1826 if (rdev
->sb_start
< rdev
->data_offset
) {
1827 /* minor versions 1 and 2; superblock before data */
1828 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1829 max_sectors
-= rdev
->data_offset
;
1830 if (!num_sectors
|| num_sectors
> max_sectors
)
1831 num_sectors
= max_sectors
;
1832 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1833 /* minor version 0 with bitmap we can't move */
1836 /* minor version 0; superblock after data */
1838 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1839 sb_start
&= ~(sector_t
)(4*2 - 1);
1840 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1841 if (!num_sectors
|| num_sectors
> max_sectors
)
1842 num_sectors
= max_sectors
;
1843 rdev
->sb_start
= sb_start
;
1845 sb
= page_address(rdev
->sb_page
);
1846 sb
->data_size
= cpu_to_le64(num_sectors
);
1847 sb
->super_offset
= rdev
->sb_start
;
1848 sb
->sb_csum
= calc_sb_1_csum(sb
);
1849 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1851 md_super_wait(rdev
->mddev
);
1857 super_1_allow_new_offset(struct md_rdev
*rdev
,
1858 unsigned long long new_offset
)
1860 /* All necessary checks on new >= old have been done */
1861 struct bitmap
*bitmap
;
1862 if (new_offset
>= rdev
->data_offset
)
1865 /* with 1.0 metadata, there is no metadata to tread on
1866 * so we can always move back */
1867 if (rdev
->mddev
->minor_version
== 0)
1870 /* otherwise we must be sure not to step on
1871 * any metadata, so stay:
1872 * 36K beyond start of superblock
1873 * beyond end of badblocks
1874 * beyond write-intent bitmap
1876 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1878 bitmap
= rdev
->mddev
->bitmap
;
1879 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1880 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1881 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1883 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1889 static struct super_type super_types
[] = {
1892 .owner
= THIS_MODULE
,
1893 .load_super
= super_90_load
,
1894 .validate_super
= super_90_validate
,
1895 .sync_super
= super_90_sync
,
1896 .rdev_size_change
= super_90_rdev_size_change
,
1897 .allow_new_offset
= super_90_allow_new_offset
,
1901 .owner
= THIS_MODULE
,
1902 .load_super
= super_1_load
,
1903 .validate_super
= super_1_validate
,
1904 .sync_super
= super_1_sync
,
1905 .rdev_size_change
= super_1_rdev_size_change
,
1906 .allow_new_offset
= super_1_allow_new_offset
,
1910 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1912 if (mddev
->sync_super
) {
1913 mddev
->sync_super(mddev
, rdev
);
1917 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1919 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1922 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1924 struct md_rdev
*rdev
, *rdev2
;
1927 rdev_for_each_rcu(rdev
, mddev1
)
1928 rdev_for_each_rcu(rdev2
, mddev2
)
1929 if (rdev
->bdev
->bd_contains
==
1930 rdev2
->bdev
->bd_contains
) {
1938 static LIST_HEAD(pending_raid_disks
);
1941 * Try to register data integrity profile for an mddev
1943 * This is called when an array is started and after a disk has been kicked
1944 * from the array. It only succeeds if all working and active component devices
1945 * are integrity capable with matching profiles.
1947 int md_integrity_register(struct mddev
*mddev
)
1949 struct md_rdev
*rdev
, *reference
= NULL
;
1951 if (list_empty(&mddev
->disks
))
1952 return 0; /* nothing to do */
1953 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1954 return 0; /* shouldn't register, or already is */
1955 rdev_for_each(rdev
, mddev
) {
1956 /* skip spares and non-functional disks */
1957 if (test_bit(Faulty
, &rdev
->flags
))
1959 if (rdev
->raid_disk
< 0)
1962 /* Use the first rdev as the reference */
1966 /* does this rdev's profile match the reference profile? */
1967 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1968 rdev
->bdev
->bd_disk
) < 0)
1971 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1974 * All component devices are integrity capable and have matching
1975 * profiles, register the common profile for the md device.
1977 if (blk_integrity_register(mddev
->gendisk
,
1978 bdev_get_integrity(reference
->bdev
)) != 0) {
1979 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1983 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1984 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1985 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1991 EXPORT_SYMBOL(md_integrity_register
);
1993 /* Disable data integrity if non-capable/non-matching disk is being added */
1994 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1996 struct blk_integrity
*bi_rdev
;
1997 struct blk_integrity
*bi_mddev
;
1999 if (!mddev
->gendisk
)
2002 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2003 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2005 if (!bi_mddev
) /* nothing to do */
2007 if (rdev
->raid_disk
< 0) /* skip spares */
2009 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2010 rdev
->bdev
->bd_disk
) >= 0)
2012 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2013 blk_integrity_unregister(mddev
->gendisk
);
2015 EXPORT_SYMBOL(md_integrity_add_rdev
);
2017 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2019 char b
[BDEVNAME_SIZE
];
2024 /* prevent duplicates */
2025 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2028 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2029 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2030 rdev
->sectors
< mddev
->dev_sectors
)) {
2032 /* Cannot change size, so fail
2033 * If mddev->level <= 0, then we don't care
2034 * about aligning sizes (e.g. linear)
2036 if (mddev
->level
> 0)
2039 mddev
->dev_sectors
= rdev
->sectors
;
2042 /* Verify rdev->desc_nr is unique.
2043 * If it is -1, assign a free number, else
2044 * check number is not in use
2047 if (rdev
->desc_nr
< 0) {
2050 choice
= mddev
->raid_disks
;
2051 while (find_rdev_nr_rcu(mddev
, choice
))
2053 rdev
->desc_nr
= choice
;
2055 if (find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2061 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2062 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2063 mdname(mddev
), mddev
->max_disks
);
2066 bdevname(rdev
->bdev
,b
);
2067 while ( (s
=strchr(b
, '/')) != NULL
)
2070 rdev
->mddev
= mddev
;
2071 printk(KERN_INFO
"md: bind<%s>\n", b
);
2073 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2076 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2077 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2078 /* failure here is OK */;
2079 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2081 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2082 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2084 /* May as well allow recovery to be retried once */
2085 mddev
->recovery_disabled
++;
2090 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2095 static void md_delayed_delete(struct work_struct
*ws
)
2097 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2098 kobject_del(&rdev
->kobj
);
2099 kobject_put(&rdev
->kobj
);
2102 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2104 char b
[BDEVNAME_SIZE
];
2106 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2107 list_del_rcu(&rdev
->same_set
);
2108 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2110 sysfs_remove_link(&rdev
->kobj
, "block");
2111 sysfs_put(rdev
->sysfs_state
);
2112 rdev
->sysfs_state
= NULL
;
2113 rdev
->badblocks
.count
= 0;
2114 /* We need to delay this, otherwise we can deadlock when
2115 * writing to 'remove' to "dev/state". We also need
2116 * to delay it due to rcu usage.
2119 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2120 kobject_get(&rdev
->kobj
);
2121 queue_work(md_misc_wq
, &rdev
->del_work
);
2125 * prevent the device from being mounted, repartitioned or
2126 * otherwise reused by a RAID array (or any other kernel
2127 * subsystem), by bd_claiming the device.
2129 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2132 struct block_device
*bdev
;
2133 char b
[BDEVNAME_SIZE
];
2135 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2136 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2138 printk(KERN_ERR
"md: could not open %s.\n",
2139 __bdevname(dev
, b
));
2140 return PTR_ERR(bdev
);
2146 static void unlock_rdev(struct md_rdev
*rdev
)
2148 struct block_device
*bdev
= rdev
->bdev
;
2150 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2153 void md_autodetect_dev(dev_t dev
);
2155 static void export_rdev(struct md_rdev
*rdev
)
2157 char b
[BDEVNAME_SIZE
];
2159 printk(KERN_INFO
"md: export_rdev(%s)\n",
2160 bdevname(rdev
->bdev
,b
));
2161 md_rdev_clear(rdev
);
2163 if (test_bit(AutoDetected
, &rdev
->flags
))
2164 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2167 kobject_put(&rdev
->kobj
);
2170 static void kick_rdev_from_array(struct md_rdev
*rdev
)
2172 unbind_rdev_from_array(rdev
);
2176 static void export_array(struct mddev
*mddev
)
2178 struct md_rdev
*rdev
;
2180 while (!list_empty(&mddev
->disks
)) {
2181 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2183 kick_rdev_from_array(rdev
);
2185 mddev
->raid_disks
= 0;
2186 mddev
->major_version
= 0;
2189 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2191 /* Update each superblock (in-memory image), but
2192 * if we are allowed to, skip spares which already
2193 * have the right event counter, or have one earlier
2194 * (which would mean they aren't being marked as dirty
2195 * with the rest of the array)
2197 struct md_rdev
*rdev
;
2198 rdev_for_each(rdev
, mddev
) {
2199 if (rdev
->sb_events
== mddev
->events
||
2201 rdev
->raid_disk
< 0 &&
2202 rdev
->sb_events
+1 == mddev
->events
)) {
2203 /* Don't update this superblock */
2204 rdev
->sb_loaded
= 2;
2206 sync_super(mddev
, rdev
);
2207 rdev
->sb_loaded
= 1;
2212 static void md_update_sb(struct mddev
*mddev
, int force_change
)
2214 struct md_rdev
*rdev
;
2217 int any_badblocks_changed
= 0;
2221 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2225 /* First make sure individual recovery_offsets are correct */
2226 rdev_for_each(rdev
, mddev
) {
2227 if (rdev
->raid_disk
>= 0 &&
2228 mddev
->delta_disks
>= 0 &&
2229 !test_bit(In_sync
, &rdev
->flags
) &&
2230 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2231 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2234 if (!mddev
->persistent
) {
2235 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2236 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2237 if (!mddev
->external
) {
2238 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2239 rdev_for_each(rdev
, mddev
) {
2240 if (rdev
->badblocks
.changed
) {
2241 rdev
->badblocks
.changed
= 0;
2242 md_ack_all_badblocks(&rdev
->badblocks
);
2243 md_error(mddev
, rdev
);
2245 clear_bit(Blocked
, &rdev
->flags
);
2246 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2247 wake_up(&rdev
->blocked_wait
);
2250 wake_up(&mddev
->sb_wait
);
2254 spin_lock(&mddev
->lock
);
2256 mddev
->utime
= get_seconds();
2258 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2260 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2261 /* just a clean<-> dirty transition, possibly leave spares alone,
2262 * though if events isn't the right even/odd, we will have to do
2268 if (mddev
->degraded
)
2269 /* If the array is degraded, then skipping spares is both
2270 * dangerous and fairly pointless.
2271 * Dangerous because a device that was removed from the array
2272 * might have a event_count that still looks up-to-date,
2273 * so it can be re-added without a resync.
2274 * Pointless because if there are any spares to skip,
2275 * then a recovery will happen and soon that array won't
2276 * be degraded any more and the spare can go back to sleep then.
2280 sync_req
= mddev
->in_sync
;
2282 /* If this is just a dirty<->clean transition, and the array is clean
2283 * and 'events' is odd, we can roll back to the previous clean state */
2285 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2286 && mddev
->can_decrease_events
2287 && mddev
->events
!= 1) {
2289 mddev
->can_decrease_events
= 0;
2291 /* otherwise we have to go forward and ... */
2293 mddev
->can_decrease_events
= nospares
;
2297 * This 64-bit counter should never wrap.
2298 * Either we are in around ~1 trillion A.C., assuming
2299 * 1 reboot per second, or we have a bug...
2301 WARN_ON(mddev
->events
== 0);
2303 rdev_for_each(rdev
, mddev
) {
2304 if (rdev
->badblocks
.changed
)
2305 any_badblocks_changed
++;
2306 if (test_bit(Faulty
, &rdev
->flags
))
2307 set_bit(FaultRecorded
, &rdev
->flags
);
2310 sync_sbs(mddev
, nospares
);
2311 spin_unlock(&mddev
->lock
);
2313 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2314 mdname(mddev
), mddev
->in_sync
);
2316 bitmap_update_sb(mddev
->bitmap
);
2317 rdev_for_each(rdev
, mddev
) {
2318 char b
[BDEVNAME_SIZE
];
2320 if (rdev
->sb_loaded
!= 1)
2321 continue; /* no noise on spare devices */
2323 if (!test_bit(Faulty
, &rdev
->flags
)) {
2324 md_super_write(mddev
,rdev
,
2325 rdev
->sb_start
, rdev
->sb_size
,
2327 pr_debug("md: (write) %s's sb offset: %llu\n",
2328 bdevname(rdev
->bdev
, b
),
2329 (unsigned long long)rdev
->sb_start
);
2330 rdev
->sb_events
= mddev
->events
;
2331 if (rdev
->badblocks
.size
) {
2332 md_super_write(mddev
, rdev
,
2333 rdev
->badblocks
.sector
,
2334 rdev
->badblocks
.size
<< 9,
2336 rdev
->badblocks
.size
= 0;
2340 pr_debug("md: %s (skipping faulty)\n",
2341 bdevname(rdev
->bdev
, b
));
2343 if (mddev
->level
== LEVEL_MULTIPATH
)
2344 /* only need to write one superblock... */
2347 md_super_wait(mddev
);
2348 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2350 spin_lock(&mddev
->lock
);
2351 if (mddev
->in_sync
!= sync_req
||
2352 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2353 /* have to write it out again */
2354 spin_unlock(&mddev
->lock
);
2357 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2358 spin_unlock(&mddev
->lock
);
2359 wake_up(&mddev
->sb_wait
);
2360 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2361 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2363 rdev_for_each(rdev
, mddev
) {
2364 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2365 clear_bit(Blocked
, &rdev
->flags
);
2367 if (any_badblocks_changed
)
2368 md_ack_all_badblocks(&rdev
->badblocks
);
2369 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2370 wake_up(&rdev
->blocked_wait
);
2374 /* words written to sysfs files may, or may not, be \n terminated.
2375 * We want to accept with case. For this we use cmd_match.
2377 static int cmd_match(const char *cmd
, const char *str
)
2379 /* See if cmd, written into a sysfs file, matches
2380 * str. They must either be the same, or cmd can
2381 * have a trailing newline
2383 while (*cmd
&& *str
&& *cmd
== *str
) {
2394 struct rdev_sysfs_entry
{
2395 struct attribute attr
;
2396 ssize_t (*show
)(struct md_rdev
*, char *);
2397 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2401 state_show(struct md_rdev
*rdev
, char *page
)
2405 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2407 if (test_bit(Faulty
, &flags
) ||
2408 rdev
->badblocks
.unacked_exist
) {
2409 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2412 if (test_bit(In_sync
, &flags
)) {
2413 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2416 if (test_bit(WriteMostly
, &flags
)) {
2417 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2420 if (test_bit(Blocked
, &flags
) ||
2421 (rdev
->badblocks
.unacked_exist
2422 && !test_bit(Faulty
, &flags
))) {
2423 len
+= sprintf(page
+len
, "%sblocked", sep
);
2426 if (!test_bit(Faulty
, &flags
) &&
2427 !test_bit(In_sync
, &flags
)) {
2428 len
+= sprintf(page
+len
, "%sspare", sep
);
2431 if (test_bit(WriteErrorSeen
, &flags
)) {
2432 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2435 if (test_bit(WantReplacement
, &flags
)) {
2436 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2439 if (test_bit(Replacement
, &flags
)) {
2440 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2444 return len
+sprintf(page
+len
, "\n");
2448 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2451 * faulty - simulates an error
2452 * remove - disconnects the device
2453 * writemostly - sets write_mostly
2454 * -writemostly - clears write_mostly
2455 * blocked - sets the Blocked flags
2456 * -blocked - clears the Blocked and possibly simulates an error
2457 * insync - sets Insync providing device isn't active
2458 * -insync - clear Insync for a device with a slot assigned,
2459 * so that it gets rebuilt based on bitmap
2460 * write_error - sets WriteErrorSeen
2461 * -write_error - clears WriteErrorSeen
2464 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2465 md_error(rdev
->mddev
, rdev
);
2466 if (test_bit(Faulty
, &rdev
->flags
))
2470 } else if (cmd_match(buf
, "remove")) {
2471 if (rdev
->raid_disk
>= 0)
2474 struct mddev
*mddev
= rdev
->mddev
;
2475 if (mddev_is_clustered(mddev
))
2476 md_cluster_ops
->metadata_update_start(mddev
);
2477 kick_rdev_from_array(rdev
);
2479 md_update_sb(mddev
, 1);
2480 md_new_event(mddev
);
2481 if (mddev_is_clustered(mddev
))
2482 md_cluster_ops
->metadata_update_finish(mddev
);
2485 } else if (cmd_match(buf
, "writemostly")) {
2486 set_bit(WriteMostly
, &rdev
->flags
);
2488 } else if (cmd_match(buf
, "-writemostly")) {
2489 clear_bit(WriteMostly
, &rdev
->flags
);
2491 } else if (cmd_match(buf
, "blocked")) {
2492 set_bit(Blocked
, &rdev
->flags
);
2494 } else if (cmd_match(buf
, "-blocked")) {
2495 if (!test_bit(Faulty
, &rdev
->flags
) &&
2496 rdev
->badblocks
.unacked_exist
) {
2497 /* metadata handler doesn't understand badblocks,
2498 * so we need to fail the device
2500 md_error(rdev
->mddev
, rdev
);
2502 clear_bit(Blocked
, &rdev
->flags
);
2503 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2504 wake_up(&rdev
->blocked_wait
);
2505 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2506 md_wakeup_thread(rdev
->mddev
->thread
);
2509 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2510 set_bit(In_sync
, &rdev
->flags
);
2512 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2513 if (rdev
->mddev
->pers
== NULL
) {
2514 clear_bit(In_sync
, &rdev
->flags
);
2515 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2516 rdev
->raid_disk
= -1;
2519 } else if (cmd_match(buf
, "write_error")) {
2520 set_bit(WriteErrorSeen
, &rdev
->flags
);
2522 } else if (cmd_match(buf
, "-write_error")) {
2523 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2525 } else if (cmd_match(buf
, "want_replacement")) {
2526 /* Any non-spare device that is not a replacement can
2527 * become want_replacement at any time, but we then need to
2528 * check if recovery is needed.
2530 if (rdev
->raid_disk
>= 0 &&
2531 !test_bit(Replacement
, &rdev
->flags
))
2532 set_bit(WantReplacement
, &rdev
->flags
);
2533 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2534 md_wakeup_thread(rdev
->mddev
->thread
);
2536 } else if (cmd_match(buf
, "-want_replacement")) {
2537 /* Clearing 'want_replacement' is always allowed.
2538 * Once replacements starts it is too late though.
2541 clear_bit(WantReplacement
, &rdev
->flags
);
2542 } else if (cmd_match(buf
, "replacement")) {
2543 /* Can only set a device as a replacement when array has not
2544 * yet been started. Once running, replacement is automatic
2545 * from spares, or by assigning 'slot'.
2547 if (rdev
->mddev
->pers
)
2550 set_bit(Replacement
, &rdev
->flags
);
2553 } else if (cmd_match(buf
, "-replacement")) {
2554 /* Similarly, can only clear Replacement before start */
2555 if (rdev
->mddev
->pers
)
2558 clear_bit(Replacement
, &rdev
->flags
);
2563 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2564 return err
? err
: len
;
2566 static struct rdev_sysfs_entry rdev_state
=
2567 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2570 errors_show(struct md_rdev
*rdev
, char *page
)
2572 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2576 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2579 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2580 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2581 atomic_set(&rdev
->corrected_errors
, n
);
2586 static struct rdev_sysfs_entry rdev_errors
=
2587 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2590 slot_show(struct md_rdev
*rdev
, char *page
)
2592 if (rdev
->raid_disk
< 0)
2593 return sprintf(page
, "none\n");
2595 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2599 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2603 int slot
= simple_strtoul(buf
, &e
, 10);
2604 if (strncmp(buf
, "none", 4)==0)
2606 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2608 if (rdev
->mddev
->pers
&& slot
== -1) {
2609 /* Setting 'slot' on an active array requires also
2610 * updating the 'rd%d' link, and communicating
2611 * with the personality with ->hot_*_disk.
2612 * For now we only support removing
2613 * failed/spare devices. This normally happens automatically,
2614 * but not when the metadata is externally managed.
2616 if (rdev
->raid_disk
== -1)
2618 /* personality does all needed checks */
2619 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2621 clear_bit(Blocked
, &rdev
->flags
);
2622 remove_and_add_spares(rdev
->mddev
, rdev
);
2623 if (rdev
->raid_disk
>= 0)
2625 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2626 md_wakeup_thread(rdev
->mddev
->thread
);
2627 } else if (rdev
->mddev
->pers
) {
2628 /* Activating a spare .. or possibly reactivating
2629 * if we ever get bitmaps working here.
2632 if (rdev
->raid_disk
!= -1)
2635 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2638 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2641 if (slot
>= rdev
->mddev
->raid_disks
&&
2642 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2645 rdev
->raid_disk
= slot
;
2646 if (test_bit(In_sync
, &rdev
->flags
))
2647 rdev
->saved_raid_disk
= slot
;
2649 rdev
->saved_raid_disk
= -1;
2650 clear_bit(In_sync
, &rdev
->flags
);
2651 clear_bit(Bitmap_sync
, &rdev
->flags
);
2652 err
= rdev
->mddev
->pers
->
2653 hot_add_disk(rdev
->mddev
, rdev
);
2655 rdev
->raid_disk
= -1;
2658 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2659 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2660 /* failure here is OK */;
2661 /* don't wakeup anyone, leave that to userspace. */
2663 if (slot
>= rdev
->mddev
->raid_disks
&&
2664 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2666 rdev
->raid_disk
= slot
;
2667 /* assume it is working */
2668 clear_bit(Faulty
, &rdev
->flags
);
2669 clear_bit(WriteMostly
, &rdev
->flags
);
2670 set_bit(In_sync
, &rdev
->flags
);
2671 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2676 static struct rdev_sysfs_entry rdev_slot
=
2677 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2680 offset_show(struct md_rdev
*rdev
, char *page
)
2682 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2686 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2688 unsigned long long offset
;
2689 if (kstrtoull(buf
, 10, &offset
) < 0)
2691 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2693 if (rdev
->sectors
&& rdev
->mddev
->external
)
2694 /* Must set offset before size, so overlap checks
2697 rdev
->data_offset
= offset
;
2698 rdev
->new_data_offset
= offset
;
2702 static struct rdev_sysfs_entry rdev_offset
=
2703 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2705 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2707 return sprintf(page
, "%llu\n",
2708 (unsigned long long)rdev
->new_data_offset
);
2711 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2712 const char *buf
, size_t len
)
2714 unsigned long long new_offset
;
2715 struct mddev
*mddev
= rdev
->mddev
;
2717 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2720 if (mddev
->sync_thread
||
2721 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2723 if (new_offset
== rdev
->data_offset
)
2724 /* reset is always permitted */
2726 else if (new_offset
> rdev
->data_offset
) {
2727 /* must not push array size beyond rdev_sectors */
2728 if (new_offset
- rdev
->data_offset
2729 + mddev
->dev_sectors
> rdev
->sectors
)
2732 /* Metadata worries about other space details. */
2734 /* decreasing the offset is inconsistent with a backwards
2737 if (new_offset
< rdev
->data_offset
&&
2738 mddev
->reshape_backwards
)
2740 /* Increasing offset is inconsistent with forwards
2741 * reshape. reshape_direction should be set to
2742 * 'backwards' first.
2744 if (new_offset
> rdev
->data_offset
&&
2745 !mddev
->reshape_backwards
)
2748 if (mddev
->pers
&& mddev
->persistent
&&
2749 !super_types
[mddev
->major_version
]
2750 .allow_new_offset(rdev
, new_offset
))
2752 rdev
->new_data_offset
= new_offset
;
2753 if (new_offset
> rdev
->data_offset
)
2754 mddev
->reshape_backwards
= 1;
2755 else if (new_offset
< rdev
->data_offset
)
2756 mddev
->reshape_backwards
= 0;
2760 static struct rdev_sysfs_entry rdev_new_offset
=
2761 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2764 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2766 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2769 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2771 /* check if two start/length pairs overlap */
2779 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2781 unsigned long long blocks
;
2784 if (kstrtoull(buf
, 10, &blocks
) < 0)
2787 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2788 return -EINVAL
; /* sector conversion overflow */
2791 if (new != blocks
* 2)
2792 return -EINVAL
; /* unsigned long long to sector_t overflow */
2799 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2801 struct mddev
*my_mddev
= rdev
->mddev
;
2802 sector_t oldsectors
= rdev
->sectors
;
2805 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2807 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2808 return -EINVAL
; /* too confusing */
2809 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2810 if (my_mddev
->persistent
) {
2811 sectors
= super_types
[my_mddev
->major_version
].
2812 rdev_size_change(rdev
, sectors
);
2815 } else if (!sectors
)
2816 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2818 if (!my_mddev
->pers
->resize
)
2819 /* Cannot change size for RAID0 or Linear etc */
2822 if (sectors
< my_mddev
->dev_sectors
)
2823 return -EINVAL
; /* component must fit device */
2825 rdev
->sectors
= sectors
;
2826 if (sectors
> oldsectors
&& my_mddev
->external
) {
2827 /* Need to check that all other rdevs with the same
2828 * ->bdev do not overlap. 'rcu' is sufficient to walk
2829 * the rdev lists safely.
2830 * This check does not provide a hard guarantee, it
2831 * just helps avoid dangerous mistakes.
2833 struct mddev
*mddev
;
2835 struct list_head
*tmp
;
2838 for_each_mddev(mddev
, tmp
) {
2839 struct md_rdev
*rdev2
;
2841 rdev_for_each(rdev2
, mddev
)
2842 if (rdev
->bdev
== rdev2
->bdev
&&
2844 overlaps(rdev
->data_offset
, rdev
->sectors
,
2857 /* Someone else could have slipped in a size
2858 * change here, but doing so is just silly.
2859 * We put oldsectors back because we *know* it is
2860 * safe, and trust userspace not to race with
2863 rdev
->sectors
= oldsectors
;
2870 static struct rdev_sysfs_entry rdev_size
=
2871 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2873 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2875 unsigned long long recovery_start
= rdev
->recovery_offset
;
2877 if (test_bit(In_sync
, &rdev
->flags
) ||
2878 recovery_start
== MaxSector
)
2879 return sprintf(page
, "none\n");
2881 return sprintf(page
, "%llu\n", recovery_start
);
2884 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2886 unsigned long long recovery_start
;
2888 if (cmd_match(buf
, "none"))
2889 recovery_start
= MaxSector
;
2890 else if (kstrtoull(buf
, 10, &recovery_start
))
2893 if (rdev
->mddev
->pers
&&
2894 rdev
->raid_disk
>= 0)
2897 rdev
->recovery_offset
= recovery_start
;
2898 if (recovery_start
== MaxSector
)
2899 set_bit(In_sync
, &rdev
->flags
);
2901 clear_bit(In_sync
, &rdev
->flags
);
2905 static struct rdev_sysfs_entry rdev_recovery_start
=
2906 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2909 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2911 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2913 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2915 return badblocks_show(&rdev
->badblocks
, page
, 0);
2917 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2919 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2920 /* Maybe that ack was all we needed */
2921 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2922 wake_up(&rdev
->blocked_wait
);
2925 static struct rdev_sysfs_entry rdev_bad_blocks
=
2926 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2928 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2930 return badblocks_show(&rdev
->badblocks
, page
, 1);
2932 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2934 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2936 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2937 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2939 static struct attribute
*rdev_default_attrs
[] = {
2944 &rdev_new_offset
.attr
,
2946 &rdev_recovery_start
.attr
,
2947 &rdev_bad_blocks
.attr
,
2948 &rdev_unack_bad_blocks
.attr
,
2952 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2954 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2955 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2961 return entry
->show(rdev
, page
);
2965 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2966 const char *page
, size_t length
)
2968 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2969 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2971 struct mddev
*mddev
= rdev
->mddev
;
2975 if (!capable(CAP_SYS_ADMIN
))
2977 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2979 if (rdev
->mddev
== NULL
)
2982 rv
= entry
->store(rdev
, page
, length
);
2983 mddev_unlock(mddev
);
2988 static void rdev_free(struct kobject
*ko
)
2990 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
2993 static const struct sysfs_ops rdev_sysfs_ops
= {
2994 .show
= rdev_attr_show
,
2995 .store
= rdev_attr_store
,
2997 static struct kobj_type rdev_ktype
= {
2998 .release
= rdev_free
,
2999 .sysfs_ops
= &rdev_sysfs_ops
,
3000 .default_attrs
= rdev_default_attrs
,
3003 int md_rdev_init(struct md_rdev
*rdev
)
3006 rdev
->saved_raid_disk
= -1;
3007 rdev
->raid_disk
= -1;
3009 rdev
->data_offset
= 0;
3010 rdev
->new_data_offset
= 0;
3011 rdev
->sb_events
= 0;
3012 rdev
->last_read_error
.tv_sec
= 0;
3013 rdev
->last_read_error
.tv_nsec
= 0;
3014 rdev
->sb_loaded
= 0;
3015 rdev
->bb_page
= NULL
;
3016 atomic_set(&rdev
->nr_pending
, 0);
3017 atomic_set(&rdev
->read_errors
, 0);
3018 atomic_set(&rdev
->corrected_errors
, 0);
3020 INIT_LIST_HEAD(&rdev
->same_set
);
3021 init_waitqueue_head(&rdev
->blocked_wait
);
3023 /* Add space to store bad block list.
3024 * This reserves the space even on arrays where it cannot
3025 * be used - I wonder if that matters
3027 rdev
->badblocks
.count
= 0;
3028 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3029 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3030 seqlock_init(&rdev
->badblocks
.lock
);
3031 if (rdev
->badblocks
.page
== NULL
)
3036 EXPORT_SYMBOL_GPL(md_rdev_init
);
3038 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3040 * mark the device faulty if:
3042 * - the device is nonexistent (zero size)
3043 * - the device has no valid superblock
3045 * a faulty rdev _never_ has rdev->sb set.
3047 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3049 char b
[BDEVNAME_SIZE
];
3051 struct md_rdev
*rdev
;
3054 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3056 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3057 return ERR_PTR(-ENOMEM
);
3060 err
= md_rdev_init(rdev
);
3063 err
= alloc_disk_sb(rdev
);
3067 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3071 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3073 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3076 "md: %s has zero or unknown size, marking faulty!\n",
3077 bdevname(rdev
->bdev
,b
));
3082 if (super_format
>= 0) {
3083 err
= super_types
[super_format
].
3084 load_super(rdev
, NULL
, super_minor
);
3085 if (err
== -EINVAL
) {
3087 "md: %s does not have a valid v%d.%d "
3088 "superblock, not importing!\n",
3089 bdevname(rdev
->bdev
,b
),
3090 super_format
, super_minor
);
3095 "md: could not read %s's sb, not importing!\n",
3096 bdevname(rdev
->bdev
,b
));
3106 md_rdev_clear(rdev
);
3108 return ERR_PTR(err
);
3112 * Check a full RAID array for plausibility
3115 static void analyze_sbs(struct mddev
*mddev
)
3118 struct md_rdev
*rdev
, *freshest
, *tmp
;
3119 char b
[BDEVNAME_SIZE
];
3122 rdev_for_each_safe(rdev
, tmp
, mddev
)
3123 switch (super_types
[mddev
->major_version
].
3124 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3132 "md: fatal superblock inconsistency in %s"
3133 " -- removing from array\n",
3134 bdevname(rdev
->bdev
,b
));
3135 kick_rdev_from_array(rdev
);
3138 super_types
[mddev
->major_version
].
3139 validate_super(mddev
, freshest
);
3142 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3143 if (mddev
->max_disks
&&
3144 (rdev
->desc_nr
>= mddev
->max_disks
||
3145 i
> mddev
->max_disks
)) {
3147 "md: %s: %s: only %d devices permitted\n",
3148 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3150 kick_rdev_from_array(rdev
);
3153 if (rdev
!= freshest
)
3154 if (super_types
[mddev
->major_version
].
3155 validate_super(mddev
, rdev
)) {
3156 printk(KERN_WARNING
"md: kicking non-fresh %s"
3158 bdevname(rdev
->bdev
,b
));
3159 kick_rdev_from_array(rdev
);
3162 if (mddev
->level
== LEVEL_MULTIPATH
) {
3163 rdev
->desc_nr
= i
++;
3164 rdev
->raid_disk
= rdev
->desc_nr
;
3165 set_bit(In_sync
, &rdev
->flags
);
3166 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3167 rdev
->raid_disk
= -1;
3168 clear_bit(In_sync
, &rdev
->flags
);
3173 /* Read a fixed-point number.
3174 * Numbers in sysfs attributes should be in "standard" units where
3175 * possible, so time should be in seconds.
3176 * However we internally use a a much smaller unit such as
3177 * milliseconds or jiffies.
3178 * This function takes a decimal number with a possible fractional
3179 * component, and produces an integer which is the result of
3180 * multiplying that number by 10^'scale'.
3181 * all without any floating-point arithmetic.
3183 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3185 unsigned long result
= 0;
3187 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3190 else if (decimals
< scale
) {
3193 result
= result
* 10 + value
;
3205 while (decimals
< scale
) {
3213 static void md_safemode_timeout(unsigned long data
);
3216 safe_delay_show(struct mddev
*mddev
, char *page
)
3218 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3219 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3222 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3226 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3229 mddev
->safemode_delay
= 0;
3231 unsigned long old_delay
= mddev
->safemode_delay
;
3232 unsigned long new_delay
= (msec
*HZ
)/1000;
3236 mddev
->safemode_delay
= new_delay
;
3237 if (new_delay
< old_delay
|| old_delay
== 0)
3238 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3242 static struct md_sysfs_entry md_safe_delay
=
3243 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3246 level_show(struct mddev
*mddev
, char *page
)
3248 struct md_personality
*p
;
3250 spin_lock(&mddev
->lock
);
3253 ret
= sprintf(page
, "%s\n", p
->name
);
3254 else if (mddev
->clevel
[0])
3255 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3256 else if (mddev
->level
!= LEVEL_NONE
)
3257 ret
= sprintf(page
, "%d\n", mddev
->level
);
3260 spin_unlock(&mddev
->lock
);
3265 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3270 struct md_personality
*pers
, *oldpers
;
3272 void *priv
, *oldpriv
;
3273 struct md_rdev
*rdev
;
3275 if (slen
== 0 || slen
>= sizeof(clevel
))
3278 rv
= mddev_lock(mddev
);
3282 if (mddev
->pers
== NULL
) {
3283 strncpy(mddev
->clevel
, buf
, slen
);
3284 if (mddev
->clevel
[slen
-1] == '\n')
3286 mddev
->clevel
[slen
] = 0;
3287 mddev
->level
= LEVEL_NONE
;
3295 /* request to change the personality. Need to ensure:
3296 * - array is not engaged in resync/recovery/reshape
3297 * - old personality can be suspended
3298 * - new personality will access other array.
3302 if (mddev
->sync_thread
||
3303 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3304 mddev
->reshape_position
!= MaxSector
||
3305 mddev
->sysfs_active
)
3309 if (!mddev
->pers
->quiesce
) {
3310 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3311 mdname(mddev
), mddev
->pers
->name
);
3315 /* Now find the new personality */
3316 strncpy(clevel
, buf
, slen
);
3317 if (clevel
[slen
-1] == '\n')
3320 if (kstrtol(clevel
, 10, &level
))
3323 if (request_module("md-%s", clevel
) != 0)
3324 request_module("md-level-%s", clevel
);
3325 spin_lock(&pers_lock
);
3326 pers
= find_pers(level
, clevel
);
3327 if (!pers
|| !try_module_get(pers
->owner
)) {
3328 spin_unlock(&pers_lock
);
3329 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3333 spin_unlock(&pers_lock
);
3335 if (pers
== mddev
->pers
) {
3336 /* Nothing to do! */
3337 module_put(pers
->owner
);
3341 if (!pers
->takeover
) {
3342 module_put(pers
->owner
);
3343 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3344 mdname(mddev
), clevel
);
3349 rdev_for_each(rdev
, mddev
)
3350 rdev
->new_raid_disk
= rdev
->raid_disk
;
3352 /* ->takeover must set new_* and/or delta_disks
3353 * if it succeeds, and may set them when it fails.
3355 priv
= pers
->takeover(mddev
);
3357 mddev
->new_level
= mddev
->level
;
3358 mddev
->new_layout
= mddev
->layout
;
3359 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3360 mddev
->raid_disks
-= mddev
->delta_disks
;
3361 mddev
->delta_disks
= 0;
3362 mddev
->reshape_backwards
= 0;
3363 module_put(pers
->owner
);
3364 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3365 mdname(mddev
), clevel
);
3370 /* Looks like we have a winner */
3371 mddev_suspend(mddev
);
3372 mddev_detach(mddev
);
3374 spin_lock(&mddev
->lock
);
3375 oldpers
= mddev
->pers
;
3376 oldpriv
= mddev
->private;
3378 mddev
->private = priv
;
3379 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3380 mddev
->level
= mddev
->new_level
;
3381 mddev
->layout
= mddev
->new_layout
;
3382 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3383 mddev
->delta_disks
= 0;
3384 mddev
->reshape_backwards
= 0;
3385 mddev
->degraded
= 0;
3386 spin_unlock(&mddev
->lock
);
3388 if (oldpers
->sync_request
== NULL
&&
3390 /* We are converting from a no-redundancy array
3391 * to a redundancy array and metadata is managed
3392 * externally so we need to be sure that writes
3393 * won't block due to a need to transition
3395 * until external management is started.
3398 mddev
->safemode_delay
= 0;
3399 mddev
->safemode
= 0;
3402 oldpers
->free(mddev
, oldpriv
);
3404 if (oldpers
->sync_request
== NULL
&&
3405 pers
->sync_request
!= NULL
) {
3406 /* need to add the md_redundancy_group */
3407 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3409 "md: cannot register extra attributes for %s\n",
3411 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3413 if (oldpers
->sync_request
!= NULL
&&
3414 pers
->sync_request
== NULL
) {
3415 /* need to remove the md_redundancy_group */
3416 if (mddev
->to_remove
== NULL
)
3417 mddev
->to_remove
= &md_redundancy_group
;
3420 rdev_for_each(rdev
, mddev
) {
3421 if (rdev
->raid_disk
< 0)
3423 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3424 rdev
->new_raid_disk
= -1;
3425 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3427 sysfs_unlink_rdev(mddev
, rdev
);
3429 rdev_for_each(rdev
, mddev
) {
3430 if (rdev
->raid_disk
< 0)
3432 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3434 rdev
->raid_disk
= rdev
->new_raid_disk
;
3435 if (rdev
->raid_disk
< 0)
3436 clear_bit(In_sync
, &rdev
->flags
);
3438 if (sysfs_link_rdev(mddev
, rdev
))
3439 printk(KERN_WARNING
"md: cannot register rd%d"
3440 " for %s after level change\n",
3441 rdev
->raid_disk
, mdname(mddev
));
3445 if (pers
->sync_request
== NULL
) {
3446 /* this is now an array without redundancy, so
3447 * it must always be in_sync
3450 del_timer_sync(&mddev
->safemode_timer
);
3452 blk_set_stacking_limits(&mddev
->queue
->limits
);
3454 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3455 mddev_resume(mddev
);
3457 md_update_sb(mddev
, 1);
3458 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3459 md_new_event(mddev
);
3462 mddev_unlock(mddev
);
3466 static struct md_sysfs_entry md_level
=
3467 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3470 layout_show(struct mddev
*mddev
, char *page
)
3472 /* just a number, not meaningful for all levels */
3473 if (mddev
->reshape_position
!= MaxSector
&&
3474 mddev
->layout
!= mddev
->new_layout
)
3475 return sprintf(page
, "%d (%d)\n",
3476 mddev
->new_layout
, mddev
->layout
);
3477 return sprintf(page
, "%d\n", mddev
->layout
);
3481 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3484 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3487 if (!*buf
|| (*e
&& *e
!= '\n'))
3489 err
= mddev_lock(mddev
);
3494 if (mddev
->pers
->check_reshape
== NULL
)
3499 mddev
->new_layout
= n
;
3500 err
= mddev
->pers
->check_reshape(mddev
);
3502 mddev
->new_layout
= mddev
->layout
;
3505 mddev
->new_layout
= n
;
3506 if (mddev
->reshape_position
== MaxSector
)
3509 mddev_unlock(mddev
);
3512 static struct md_sysfs_entry md_layout
=
3513 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3516 raid_disks_show(struct mddev
*mddev
, char *page
)
3518 if (mddev
->raid_disks
== 0)
3520 if (mddev
->reshape_position
!= MaxSector
&&
3521 mddev
->delta_disks
!= 0)
3522 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3523 mddev
->raid_disks
- mddev
->delta_disks
);
3524 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3527 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3530 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3534 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3536 if (!*buf
|| (*e
&& *e
!= '\n'))
3539 err
= mddev_lock(mddev
);
3543 err
= update_raid_disks(mddev
, n
);
3544 else if (mddev
->reshape_position
!= MaxSector
) {
3545 struct md_rdev
*rdev
;
3546 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3549 rdev_for_each(rdev
, mddev
) {
3551 rdev
->data_offset
< rdev
->new_data_offset
)
3554 rdev
->data_offset
> rdev
->new_data_offset
)
3558 mddev
->delta_disks
= n
- olddisks
;
3559 mddev
->raid_disks
= n
;
3560 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3562 mddev
->raid_disks
= n
;
3564 mddev_unlock(mddev
);
3565 return err
? err
: len
;
3567 static struct md_sysfs_entry md_raid_disks
=
3568 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3571 chunk_size_show(struct mddev
*mddev
, char *page
)
3573 if (mddev
->reshape_position
!= MaxSector
&&
3574 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3575 return sprintf(page
, "%d (%d)\n",
3576 mddev
->new_chunk_sectors
<< 9,
3577 mddev
->chunk_sectors
<< 9);
3578 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3582 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3586 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3588 if (!*buf
|| (*e
&& *e
!= '\n'))
3591 err
= mddev_lock(mddev
);
3595 if (mddev
->pers
->check_reshape
== NULL
)
3600 mddev
->new_chunk_sectors
= n
>> 9;
3601 err
= mddev
->pers
->check_reshape(mddev
);
3603 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3606 mddev
->new_chunk_sectors
= n
>> 9;
3607 if (mddev
->reshape_position
== MaxSector
)
3608 mddev
->chunk_sectors
= n
>> 9;
3610 mddev_unlock(mddev
);
3613 static struct md_sysfs_entry md_chunk_size
=
3614 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3617 resync_start_show(struct mddev
*mddev
, char *page
)
3619 if (mddev
->recovery_cp
== MaxSector
)
3620 return sprintf(page
, "none\n");
3621 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3625 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3629 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3631 err
= mddev_lock(mddev
);
3634 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3636 else if (cmd_match(buf
, "none"))
3638 else if (!*buf
|| (*e
&& *e
!= '\n'))
3642 mddev
->recovery_cp
= n
;
3644 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3646 mddev_unlock(mddev
);
3649 static struct md_sysfs_entry md_resync_start
=
3650 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3653 * The array state can be:
3656 * No devices, no size, no level
3657 * Equivalent to STOP_ARRAY ioctl
3659 * May have some settings, but array is not active
3660 * all IO results in error
3661 * When written, doesn't tear down array, but just stops it
3662 * suspended (not supported yet)
3663 * All IO requests will block. The array can be reconfigured.
3664 * Writing this, if accepted, will block until array is quiescent
3666 * no resync can happen. no superblocks get written.
3667 * write requests fail
3669 * like readonly, but behaves like 'clean' on a write request.
3671 * clean - no pending writes, but otherwise active.
3672 * When written to inactive array, starts without resync
3673 * If a write request arrives then
3674 * if metadata is known, mark 'dirty' and switch to 'active'.
3675 * if not known, block and switch to write-pending
3676 * If written to an active array that has pending writes, then fails.
3678 * fully active: IO and resync can be happening.
3679 * When written to inactive array, starts with resync
3682 * clean, but writes are blocked waiting for 'active' to be written.
3685 * like active, but no writes have been seen for a while (100msec).
3688 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3689 write_pending
, active_idle
, bad_word
};
3690 static char *array_states
[] = {
3691 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3692 "write-pending", "active-idle", NULL
};
3694 static int match_word(const char *word
, char **list
)
3697 for (n
=0; list
[n
]; n
++)
3698 if (cmd_match(word
, list
[n
]))
3704 array_state_show(struct mddev
*mddev
, char *page
)
3706 enum array_state st
= inactive
;
3719 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3721 else if (mddev
->safemode
)
3727 if (list_empty(&mddev
->disks
) &&
3728 mddev
->raid_disks
== 0 &&
3729 mddev
->dev_sectors
== 0)
3734 return sprintf(page
, "%s\n", array_states
[st
]);
3737 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3738 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3739 static int do_md_run(struct mddev
*mddev
);
3740 static int restart_array(struct mddev
*mddev
);
3743 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3746 enum array_state st
= match_word(buf
, array_states
);
3748 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3749 /* don't take reconfig_mutex when toggling between
3752 spin_lock(&mddev
->lock
);
3754 restart_array(mddev
);
3755 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3756 wake_up(&mddev
->sb_wait
);
3758 } else /* st == clean */ {
3759 restart_array(mddev
);
3760 if (atomic_read(&mddev
->writes_pending
) == 0) {
3761 if (mddev
->in_sync
== 0) {
3763 if (mddev
->safemode
== 1)
3764 mddev
->safemode
= 0;
3765 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3771 spin_unlock(&mddev
->lock
);
3774 err
= mddev_lock(mddev
);
3782 /* stopping an active array */
3783 err
= do_md_stop(mddev
, 0, NULL
);
3786 /* stopping an active array */
3788 err
= do_md_stop(mddev
, 2, NULL
);
3790 err
= 0; /* already inactive */
3793 break; /* not supported yet */
3796 err
= md_set_readonly(mddev
, NULL
);
3799 set_disk_ro(mddev
->gendisk
, 1);
3800 err
= do_md_run(mddev
);
3806 err
= md_set_readonly(mddev
, NULL
);
3807 else if (mddev
->ro
== 1)
3808 err
= restart_array(mddev
);
3811 set_disk_ro(mddev
->gendisk
, 0);
3815 err
= do_md_run(mddev
);
3820 restart_array(mddev
);
3821 spin_lock(&mddev
->lock
);
3822 if (atomic_read(&mddev
->writes_pending
) == 0) {
3823 if (mddev
->in_sync
== 0) {
3825 if (mddev
->safemode
== 1)
3826 mddev
->safemode
= 0;
3827 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3832 spin_unlock(&mddev
->lock
);
3838 restart_array(mddev
);
3839 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3840 wake_up(&mddev
->sb_wait
);
3844 set_disk_ro(mddev
->gendisk
, 0);
3845 err
= do_md_run(mddev
);
3850 /* these cannot be set */
3855 if (mddev
->hold_active
== UNTIL_IOCTL
)
3856 mddev
->hold_active
= 0;
3857 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3859 mddev_unlock(mddev
);
3862 static struct md_sysfs_entry md_array_state
=
3863 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3866 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3867 return sprintf(page
, "%d\n",
3868 atomic_read(&mddev
->max_corr_read_errors
));
3872 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3875 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3877 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3878 atomic_set(&mddev
->max_corr_read_errors
, n
);
3884 static struct md_sysfs_entry max_corr_read_errors
=
3885 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3886 max_corrected_read_errors_store
);
3889 null_show(struct mddev
*mddev
, char *page
)
3895 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3897 /* buf must be %d:%d\n? giving major and minor numbers */
3898 /* The new device is added to the array.
3899 * If the array has a persistent superblock, we read the
3900 * superblock to initialise info and check validity.
3901 * Otherwise, only checking done is that in bind_rdev_to_array,
3902 * which mainly checks size.
3905 int major
= simple_strtoul(buf
, &e
, 10);
3908 struct md_rdev
*rdev
;
3911 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3913 minor
= simple_strtoul(e
+1, &e
, 10);
3914 if (*e
&& *e
!= '\n')
3916 dev
= MKDEV(major
, minor
);
3917 if (major
!= MAJOR(dev
) ||
3918 minor
!= MINOR(dev
))
3921 flush_workqueue(md_misc_wq
);
3923 err
= mddev_lock(mddev
);
3926 if (mddev
->persistent
) {
3927 rdev
= md_import_device(dev
, mddev
->major_version
,
3928 mddev
->minor_version
);
3929 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3930 struct md_rdev
*rdev0
3931 = list_entry(mddev
->disks
.next
,
3932 struct md_rdev
, same_set
);
3933 err
= super_types
[mddev
->major_version
]
3934 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3938 } else if (mddev
->external
)
3939 rdev
= md_import_device(dev
, -2, -1);
3941 rdev
= md_import_device(dev
, -1, -1);
3944 return PTR_ERR(rdev
);
3945 err
= bind_rdev_to_array(rdev
, mddev
);
3949 mddev_unlock(mddev
);
3950 return err
? err
: len
;
3953 static struct md_sysfs_entry md_new_device
=
3954 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3957 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3960 unsigned long chunk
, end_chunk
;
3963 err
= mddev_lock(mddev
);
3968 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3970 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3971 if (buf
== end
) break;
3972 if (*end
== '-') { /* range */
3974 end_chunk
= simple_strtoul(buf
, &end
, 0);
3975 if (buf
== end
) break;
3977 if (*end
&& !isspace(*end
)) break;
3978 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3979 buf
= skip_spaces(end
);
3981 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3983 mddev_unlock(mddev
);
3987 static struct md_sysfs_entry md_bitmap
=
3988 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3991 size_show(struct mddev
*mddev
, char *page
)
3993 return sprintf(page
, "%llu\n",
3994 (unsigned long long)mddev
->dev_sectors
/ 2);
3997 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4000 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4002 /* If array is inactive, we can reduce the component size, but
4003 * not increase it (except from 0).
4004 * If array is active, we can try an on-line resize
4007 int err
= strict_blocks_to_sectors(buf
, §ors
);
4011 err
= mddev_lock(mddev
);
4015 if (mddev_is_clustered(mddev
))
4016 md_cluster_ops
->metadata_update_start(mddev
);
4017 err
= update_size(mddev
, sectors
);
4018 md_update_sb(mddev
, 1);
4019 if (mddev_is_clustered(mddev
))
4020 md_cluster_ops
->metadata_update_finish(mddev
);
4022 if (mddev
->dev_sectors
== 0 ||
4023 mddev
->dev_sectors
> sectors
)
4024 mddev
->dev_sectors
= sectors
;
4028 mddev_unlock(mddev
);
4029 return err
? err
: len
;
4032 static struct md_sysfs_entry md_size
=
4033 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4035 /* Metadata version.
4037 * 'none' for arrays with no metadata (good luck...)
4038 * 'external' for arrays with externally managed metadata,
4039 * or N.M for internally known formats
4042 metadata_show(struct mddev
*mddev
, char *page
)
4044 if (mddev
->persistent
)
4045 return sprintf(page
, "%d.%d\n",
4046 mddev
->major_version
, mddev
->minor_version
);
4047 else if (mddev
->external
)
4048 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4050 return sprintf(page
, "none\n");
4054 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4059 /* Changing the details of 'external' metadata is
4060 * always permitted. Otherwise there must be
4061 * no devices attached to the array.
4064 err
= mddev_lock(mddev
);
4068 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4070 else if (!list_empty(&mddev
->disks
))
4074 if (cmd_match(buf
, "none")) {
4075 mddev
->persistent
= 0;
4076 mddev
->external
= 0;
4077 mddev
->major_version
= 0;
4078 mddev
->minor_version
= 90;
4081 if (strncmp(buf
, "external:", 9) == 0) {
4082 size_t namelen
= len
-9;
4083 if (namelen
>= sizeof(mddev
->metadata_type
))
4084 namelen
= sizeof(mddev
->metadata_type
)-1;
4085 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4086 mddev
->metadata_type
[namelen
] = 0;
4087 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4088 mddev
->metadata_type
[--namelen
] = 0;
4089 mddev
->persistent
= 0;
4090 mddev
->external
= 1;
4091 mddev
->major_version
= 0;
4092 mddev
->minor_version
= 90;
4095 major
= simple_strtoul(buf
, &e
, 10);
4097 if (e
==buf
|| *e
!= '.')
4100 minor
= simple_strtoul(buf
, &e
, 10);
4101 if (e
==buf
|| (*e
&& *e
!= '\n') )
4104 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4106 mddev
->major_version
= major
;
4107 mddev
->minor_version
= minor
;
4108 mddev
->persistent
= 1;
4109 mddev
->external
= 0;
4112 mddev_unlock(mddev
);
4116 static struct md_sysfs_entry md_metadata
=
4117 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4120 action_show(struct mddev
*mddev
, char *page
)
4122 char *type
= "idle";
4123 unsigned long recovery
= mddev
->recovery
;
4124 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4126 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4127 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4128 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4130 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4131 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4133 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4137 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4140 return sprintf(page
, "%s\n", type
);
4144 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4146 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4149 if (cmd_match(page
, "frozen"))
4150 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4152 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4154 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4155 flush_workqueue(md_misc_wq
);
4156 if (mddev
->sync_thread
) {
4157 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4158 if (mddev_lock(mddev
) == 0) {
4159 md_reap_sync_thread(mddev
);
4160 mddev_unlock(mddev
);
4163 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4164 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4166 else if (cmd_match(page
, "resync"))
4167 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4168 else if (cmd_match(page
, "recover")) {
4169 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4170 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4171 } else if (cmd_match(page
, "reshape")) {
4173 if (mddev
->pers
->start_reshape
== NULL
)
4175 err
= mddev_lock(mddev
);
4177 err
= mddev
->pers
->start_reshape(mddev
);
4178 mddev_unlock(mddev
);
4182 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4184 if (cmd_match(page
, "check"))
4185 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4186 else if (!cmd_match(page
, "repair"))
4188 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4189 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4191 if (mddev
->ro
== 2) {
4192 /* A write to sync_action is enough to justify
4193 * canceling read-auto mode
4196 md_wakeup_thread(mddev
->sync_thread
);
4198 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4199 md_wakeup_thread(mddev
->thread
);
4200 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4204 static struct md_sysfs_entry md_scan_mode
=
4205 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4208 last_sync_action_show(struct mddev
*mddev
, char *page
)
4210 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4213 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4216 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4218 return sprintf(page
, "%llu\n",
4219 (unsigned long long)
4220 atomic64_read(&mddev
->resync_mismatches
));
4223 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4226 sync_min_show(struct mddev
*mddev
, char *page
)
4228 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4229 mddev
->sync_speed_min
? "local": "system");
4233 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4237 if (strncmp(buf
, "system", 6)==0) {
4238 mddev
->sync_speed_min
= 0;
4241 min
= simple_strtoul(buf
, &e
, 10);
4242 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4244 mddev
->sync_speed_min
= min
;
4248 static struct md_sysfs_entry md_sync_min
=
4249 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4252 sync_max_show(struct mddev
*mddev
, char *page
)
4254 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4255 mddev
->sync_speed_max
? "local": "system");
4259 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4263 if (strncmp(buf
, "system", 6)==0) {
4264 mddev
->sync_speed_max
= 0;
4267 max
= simple_strtoul(buf
, &e
, 10);
4268 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4270 mddev
->sync_speed_max
= max
;
4274 static struct md_sysfs_entry md_sync_max
=
4275 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4278 degraded_show(struct mddev
*mddev
, char *page
)
4280 return sprintf(page
, "%d\n", mddev
->degraded
);
4282 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4285 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4287 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4291 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4295 if (kstrtol(buf
, 10, &n
))
4298 if (n
!= 0 && n
!= 1)
4301 mddev
->parallel_resync
= n
;
4303 if (mddev
->sync_thread
)
4304 wake_up(&resync_wait
);
4309 /* force parallel resync, even with shared block devices */
4310 static struct md_sysfs_entry md_sync_force_parallel
=
4311 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4312 sync_force_parallel_show
, sync_force_parallel_store
);
4315 sync_speed_show(struct mddev
*mddev
, char *page
)
4317 unsigned long resync
, dt
, db
;
4318 if (mddev
->curr_resync
== 0)
4319 return sprintf(page
, "none\n");
4320 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4321 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4323 db
= resync
- mddev
->resync_mark_cnt
;
4324 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4327 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4330 sync_completed_show(struct mddev
*mddev
, char *page
)
4332 unsigned long long max_sectors
, resync
;
4334 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4335 return sprintf(page
, "none\n");
4337 if (mddev
->curr_resync
== 1 ||
4338 mddev
->curr_resync
== 2)
4339 return sprintf(page
, "delayed\n");
4341 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4342 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4343 max_sectors
= mddev
->resync_max_sectors
;
4345 max_sectors
= mddev
->dev_sectors
;
4347 resync
= mddev
->curr_resync_completed
;
4348 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4351 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4354 min_sync_show(struct mddev
*mddev
, char *page
)
4356 return sprintf(page
, "%llu\n",
4357 (unsigned long long)mddev
->resync_min
);
4360 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4362 unsigned long long min
;
4366 if (kstrtoull(buf
, 10, &min
))
4369 spin_lock(&mddev
->lock
);
4371 if (min
> mddev
->resync_max
)
4375 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4378 /* Must be a multiple of chunk_size */
4379 chunk
= mddev
->chunk_sectors
;
4381 sector_t temp
= min
;
4384 if (sector_div(temp
, chunk
))
4387 mddev
->resync_min
= min
;
4391 spin_unlock(&mddev
->lock
);
4395 static struct md_sysfs_entry md_min_sync
=
4396 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4399 max_sync_show(struct mddev
*mddev
, char *page
)
4401 if (mddev
->resync_max
== MaxSector
)
4402 return sprintf(page
, "max\n");
4404 return sprintf(page
, "%llu\n",
4405 (unsigned long long)mddev
->resync_max
);
4408 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4411 spin_lock(&mddev
->lock
);
4412 if (strncmp(buf
, "max", 3) == 0)
4413 mddev
->resync_max
= MaxSector
;
4415 unsigned long long max
;
4419 if (kstrtoull(buf
, 10, &max
))
4421 if (max
< mddev
->resync_min
)
4425 if (max
< mddev
->resync_max
&&
4427 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4430 /* Must be a multiple of chunk_size */
4431 chunk
= mddev
->chunk_sectors
;
4433 sector_t temp
= max
;
4436 if (sector_div(temp
, chunk
))
4439 mddev
->resync_max
= max
;
4441 wake_up(&mddev
->recovery_wait
);
4444 spin_unlock(&mddev
->lock
);
4448 static struct md_sysfs_entry md_max_sync
=
4449 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4452 suspend_lo_show(struct mddev
*mddev
, char *page
)
4454 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4458 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4461 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4462 unsigned long long old
;
4465 if (buf
== e
|| (*e
&& *e
!= '\n'))
4468 err
= mddev_lock(mddev
);
4472 if (mddev
->pers
== NULL
||
4473 mddev
->pers
->quiesce
== NULL
)
4475 old
= mddev
->suspend_lo
;
4476 mddev
->suspend_lo
= new;
4478 /* Shrinking suspended region */
4479 mddev
->pers
->quiesce(mddev
, 2);
4481 /* Expanding suspended region - need to wait */
4482 mddev
->pers
->quiesce(mddev
, 1);
4483 mddev
->pers
->quiesce(mddev
, 0);
4487 mddev_unlock(mddev
);
4490 static struct md_sysfs_entry md_suspend_lo
=
4491 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4494 suspend_hi_show(struct mddev
*mddev
, char *page
)
4496 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4500 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4503 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4504 unsigned long long old
;
4507 if (buf
== e
|| (*e
&& *e
!= '\n'))
4510 err
= mddev_lock(mddev
);
4514 if (mddev
->pers
== NULL
||
4515 mddev
->pers
->quiesce
== NULL
)
4517 old
= mddev
->suspend_hi
;
4518 mddev
->suspend_hi
= new;
4520 /* Shrinking suspended region */
4521 mddev
->pers
->quiesce(mddev
, 2);
4523 /* Expanding suspended region - need to wait */
4524 mddev
->pers
->quiesce(mddev
, 1);
4525 mddev
->pers
->quiesce(mddev
, 0);
4529 mddev_unlock(mddev
);
4532 static struct md_sysfs_entry md_suspend_hi
=
4533 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4536 reshape_position_show(struct mddev
*mddev
, char *page
)
4538 if (mddev
->reshape_position
!= MaxSector
)
4539 return sprintf(page
, "%llu\n",
4540 (unsigned long long)mddev
->reshape_position
);
4541 strcpy(page
, "none\n");
4546 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4548 struct md_rdev
*rdev
;
4551 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4553 if (buf
== e
|| (*e
&& *e
!= '\n'))
4555 err
= mddev_lock(mddev
);
4561 mddev
->reshape_position
= new;
4562 mddev
->delta_disks
= 0;
4563 mddev
->reshape_backwards
= 0;
4564 mddev
->new_level
= mddev
->level
;
4565 mddev
->new_layout
= mddev
->layout
;
4566 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4567 rdev_for_each(rdev
, mddev
)
4568 rdev
->new_data_offset
= rdev
->data_offset
;
4571 mddev_unlock(mddev
);
4575 static struct md_sysfs_entry md_reshape_position
=
4576 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4577 reshape_position_store
);
4580 reshape_direction_show(struct mddev
*mddev
, char *page
)
4582 return sprintf(page
, "%s\n",
4583 mddev
->reshape_backwards
? "backwards" : "forwards");
4587 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4592 if (cmd_match(buf
, "forwards"))
4594 else if (cmd_match(buf
, "backwards"))
4598 if (mddev
->reshape_backwards
== backwards
)
4601 err
= mddev_lock(mddev
);
4604 /* check if we are allowed to change */
4605 if (mddev
->delta_disks
)
4607 else if (mddev
->persistent
&&
4608 mddev
->major_version
== 0)
4611 mddev
->reshape_backwards
= backwards
;
4612 mddev_unlock(mddev
);
4616 static struct md_sysfs_entry md_reshape_direction
=
4617 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4618 reshape_direction_store
);
4621 array_size_show(struct mddev
*mddev
, char *page
)
4623 if (mddev
->external_size
)
4624 return sprintf(page
, "%llu\n",
4625 (unsigned long long)mddev
->array_sectors
/2);
4627 return sprintf(page
, "default\n");
4631 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4636 err
= mddev_lock(mddev
);
4640 if (strncmp(buf
, "default", 7) == 0) {
4642 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4644 sectors
= mddev
->array_sectors
;
4646 mddev
->external_size
= 0;
4648 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4650 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4653 mddev
->external_size
= 1;
4657 mddev
->array_sectors
= sectors
;
4659 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4660 revalidate_disk(mddev
->gendisk
);
4663 mddev_unlock(mddev
);
4667 static struct md_sysfs_entry md_array_size
=
4668 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4671 static struct attribute
*md_default_attrs
[] = {
4674 &md_raid_disks
.attr
,
4675 &md_chunk_size
.attr
,
4677 &md_resync_start
.attr
,
4679 &md_new_device
.attr
,
4680 &md_safe_delay
.attr
,
4681 &md_array_state
.attr
,
4682 &md_reshape_position
.attr
,
4683 &md_reshape_direction
.attr
,
4684 &md_array_size
.attr
,
4685 &max_corr_read_errors
.attr
,
4689 static struct attribute
*md_redundancy_attrs
[] = {
4691 &md_last_scan_mode
.attr
,
4692 &md_mismatches
.attr
,
4695 &md_sync_speed
.attr
,
4696 &md_sync_force_parallel
.attr
,
4697 &md_sync_completed
.attr
,
4700 &md_suspend_lo
.attr
,
4701 &md_suspend_hi
.attr
,
4706 static struct attribute_group md_redundancy_group
= {
4708 .attrs
= md_redundancy_attrs
,
4712 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4714 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4715 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4720 spin_lock(&all_mddevs_lock
);
4721 if (list_empty(&mddev
->all_mddevs
)) {
4722 spin_unlock(&all_mddevs_lock
);
4726 spin_unlock(&all_mddevs_lock
);
4728 rv
= entry
->show(mddev
, page
);
4734 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4735 const char *page
, size_t length
)
4737 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4738 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4743 if (!capable(CAP_SYS_ADMIN
))
4745 spin_lock(&all_mddevs_lock
);
4746 if (list_empty(&mddev
->all_mddevs
)) {
4747 spin_unlock(&all_mddevs_lock
);
4751 spin_unlock(&all_mddevs_lock
);
4752 rv
= entry
->store(mddev
, page
, length
);
4757 static void md_free(struct kobject
*ko
)
4759 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4761 if (mddev
->sysfs_state
)
4762 sysfs_put(mddev
->sysfs_state
);
4764 if (mddev
->gendisk
) {
4765 del_gendisk(mddev
->gendisk
);
4766 put_disk(mddev
->gendisk
);
4769 blk_cleanup_queue(mddev
->queue
);
4774 static const struct sysfs_ops md_sysfs_ops
= {
4775 .show
= md_attr_show
,
4776 .store
= md_attr_store
,
4778 static struct kobj_type md_ktype
= {
4780 .sysfs_ops
= &md_sysfs_ops
,
4781 .default_attrs
= md_default_attrs
,
4786 static void mddev_delayed_delete(struct work_struct
*ws
)
4788 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4790 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4791 kobject_del(&mddev
->kobj
);
4792 kobject_put(&mddev
->kobj
);
4795 static int md_alloc(dev_t dev
, char *name
)
4797 static DEFINE_MUTEX(disks_mutex
);
4798 struct mddev
*mddev
= mddev_find(dev
);
4799 struct gendisk
*disk
;
4808 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4809 shift
= partitioned
? MdpMinorShift
: 0;
4810 unit
= MINOR(mddev
->unit
) >> shift
;
4812 /* wait for any previous instance of this device to be
4813 * completely removed (mddev_delayed_delete).
4815 flush_workqueue(md_misc_wq
);
4817 mutex_lock(&disks_mutex
);
4823 /* Need to ensure that 'name' is not a duplicate.
4825 struct mddev
*mddev2
;
4826 spin_lock(&all_mddevs_lock
);
4828 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4829 if (mddev2
->gendisk
&&
4830 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4831 spin_unlock(&all_mddevs_lock
);
4834 spin_unlock(&all_mddevs_lock
);
4838 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4841 mddev
->queue
->queuedata
= mddev
;
4843 blk_queue_make_request(mddev
->queue
, md_make_request
);
4844 blk_set_stacking_limits(&mddev
->queue
->limits
);
4846 disk
= alloc_disk(1 << shift
);
4848 blk_cleanup_queue(mddev
->queue
);
4849 mddev
->queue
= NULL
;
4852 disk
->major
= MAJOR(mddev
->unit
);
4853 disk
->first_minor
= unit
<< shift
;
4855 strcpy(disk
->disk_name
, name
);
4856 else if (partitioned
)
4857 sprintf(disk
->disk_name
, "md_d%d", unit
);
4859 sprintf(disk
->disk_name
, "md%d", unit
);
4860 disk
->fops
= &md_fops
;
4861 disk
->private_data
= mddev
;
4862 disk
->queue
= mddev
->queue
;
4863 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4864 /* Allow extended partitions. This makes the
4865 * 'mdp' device redundant, but we can't really
4868 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4869 mddev
->gendisk
= disk
;
4870 /* As soon as we call add_disk(), another thread could get
4871 * through to md_open, so make sure it doesn't get too far
4873 mutex_lock(&mddev
->open_mutex
);
4876 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4877 &disk_to_dev(disk
)->kobj
, "%s", "md");
4879 /* This isn't possible, but as kobject_init_and_add is marked
4880 * __must_check, we must do something with the result
4882 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4886 if (mddev
->kobj
.sd
&&
4887 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4888 printk(KERN_DEBUG
"pointless warning\n");
4889 mutex_unlock(&mddev
->open_mutex
);
4891 mutex_unlock(&disks_mutex
);
4892 if (!error
&& mddev
->kobj
.sd
) {
4893 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4894 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4900 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4902 md_alloc(dev
, NULL
);
4906 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4908 /* val must be "md_*" where * is not all digits.
4909 * We allocate an array with a large free minor number, and
4910 * set the name to val. val must not already be an active name.
4912 int len
= strlen(val
);
4913 char buf
[DISK_NAME_LEN
];
4915 while (len
&& val
[len
-1] == '\n')
4917 if (len
>= DISK_NAME_LEN
)
4919 strlcpy(buf
, val
, len
+1);
4920 if (strncmp(buf
, "md_", 3) != 0)
4922 return md_alloc(0, buf
);
4925 static void md_safemode_timeout(unsigned long data
)
4927 struct mddev
*mddev
= (struct mddev
*) data
;
4929 if (!atomic_read(&mddev
->writes_pending
)) {
4930 mddev
->safemode
= 1;
4931 if (mddev
->external
)
4932 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4934 md_wakeup_thread(mddev
->thread
);
4937 static int start_dirty_degraded
;
4939 int md_run(struct mddev
*mddev
)
4942 struct md_rdev
*rdev
;
4943 struct md_personality
*pers
;
4945 if (list_empty(&mddev
->disks
))
4946 /* cannot run an array with no devices.. */
4951 /* Cannot run until previous stop completes properly */
4952 if (mddev
->sysfs_active
)
4956 * Analyze all RAID superblock(s)
4958 if (!mddev
->raid_disks
) {
4959 if (!mddev
->persistent
)
4964 if (mddev
->level
!= LEVEL_NONE
)
4965 request_module("md-level-%d", mddev
->level
);
4966 else if (mddev
->clevel
[0])
4967 request_module("md-%s", mddev
->clevel
);
4970 * Drop all container device buffers, from now on
4971 * the only valid external interface is through the md
4974 rdev_for_each(rdev
, mddev
) {
4975 if (test_bit(Faulty
, &rdev
->flags
))
4977 sync_blockdev(rdev
->bdev
);
4978 invalidate_bdev(rdev
->bdev
);
4980 /* perform some consistency tests on the device.
4981 * We don't want the data to overlap the metadata,
4982 * Internal Bitmap issues have been handled elsewhere.
4984 if (rdev
->meta_bdev
) {
4985 /* Nothing to check */;
4986 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4987 if (mddev
->dev_sectors
&&
4988 rdev
->data_offset
+ mddev
->dev_sectors
4990 printk("md: %s: data overlaps metadata\n",
4995 if (rdev
->sb_start
+ rdev
->sb_size
/512
4996 > rdev
->data_offset
) {
4997 printk("md: %s: metadata overlaps data\n",
5002 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5005 if (mddev
->bio_set
== NULL
)
5006 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5008 spin_lock(&pers_lock
);
5009 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5010 if (!pers
|| !try_module_get(pers
->owner
)) {
5011 spin_unlock(&pers_lock
);
5012 if (mddev
->level
!= LEVEL_NONE
)
5013 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5016 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5020 spin_unlock(&pers_lock
);
5021 if (mddev
->level
!= pers
->level
) {
5022 mddev
->level
= pers
->level
;
5023 mddev
->new_level
= pers
->level
;
5025 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5027 if (mddev
->reshape_position
!= MaxSector
&&
5028 pers
->start_reshape
== NULL
) {
5029 /* This personality cannot handle reshaping... */
5030 module_put(pers
->owner
);
5034 if (pers
->sync_request
) {
5035 /* Warn if this is a potentially silly
5038 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5039 struct md_rdev
*rdev2
;
5042 rdev_for_each(rdev
, mddev
)
5043 rdev_for_each(rdev2
, mddev
) {
5045 rdev
->bdev
->bd_contains
==
5046 rdev2
->bdev
->bd_contains
) {
5048 "%s: WARNING: %s appears to be"
5049 " on the same physical disk as"
5052 bdevname(rdev
->bdev
,b
),
5053 bdevname(rdev2
->bdev
,b2
));
5060 "True protection against single-disk"
5061 " failure might be compromised.\n");
5064 mddev
->recovery
= 0;
5065 /* may be over-ridden by personality */
5066 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5068 mddev
->ok_start_degraded
= start_dirty_degraded
;
5070 if (start_readonly
&& mddev
->ro
== 0)
5071 mddev
->ro
= 2; /* read-only, but switch on first write */
5073 err
= pers
->run(mddev
);
5075 printk(KERN_ERR
"md: pers->run() failed ...\n");
5076 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5077 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5078 " but 'external_size' not in effect?\n", __func__
);
5080 "md: invalid array_size %llu > default size %llu\n",
5081 (unsigned long long)mddev
->array_sectors
/ 2,
5082 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5085 if (err
== 0 && pers
->sync_request
&&
5086 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5087 struct bitmap
*bitmap
;
5089 bitmap
= bitmap_create(mddev
, -1);
5090 if (IS_ERR(bitmap
)) {
5091 err
= PTR_ERR(bitmap
);
5092 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5093 mdname(mddev
), err
);
5095 mddev
->bitmap
= bitmap
;
5099 mddev_detach(mddev
);
5100 pers
->free(mddev
, mddev
->private);
5101 module_put(pers
->owner
);
5102 bitmap_destroy(mddev
);
5106 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5107 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5108 blk_queue_merge_bvec(mddev
->queue
, md_mergeable_bvec
);
5110 if (pers
->sync_request
) {
5111 if (mddev
->kobj
.sd
&&
5112 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5114 "md: cannot register extra attributes for %s\n",
5116 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5117 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5120 atomic_set(&mddev
->writes_pending
,0);
5121 atomic_set(&mddev
->max_corr_read_errors
,
5122 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5123 mddev
->safemode
= 0;
5124 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5125 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5126 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5129 spin_lock(&mddev
->lock
);
5132 spin_unlock(&mddev
->lock
);
5133 rdev_for_each(rdev
, mddev
)
5134 if (rdev
->raid_disk
>= 0)
5135 if (sysfs_link_rdev(mddev
, rdev
))
5136 /* failure here is OK */;
5138 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5140 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5141 md_update_sb(mddev
, 0);
5143 md_new_event(mddev
);
5144 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5145 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5146 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5149 EXPORT_SYMBOL_GPL(md_run
);
5151 static int do_md_run(struct mddev
*mddev
)
5155 err
= md_run(mddev
);
5158 err
= bitmap_load(mddev
);
5160 bitmap_destroy(mddev
);
5164 md_wakeup_thread(mddev
->thread
);
5165 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5167 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5168 revalidate_disk(mddev
->gendisk
);
5170 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5175 static int restart_array(struct mddev
*mddev
)
5177 struct gendisk
*disk
= mddev
->gendisk
;
5179 /* Complain if it has no devices */
5180 if (list_empty(&mddev
->disks
))
5186 mddev
->safemode
= 0;
5188 set_disk_ro(disk
, 0);
5189 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5191 /* Kick recovery or resync if necessary */
5192 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5193 md_wakeup_thread(mddev
->thread
);
5194 md_wakeup_thread(mddev
->sync_thread
);
5195 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5199 static void md_clean(struct mddev
*mddev
)
5201 mddev
->array_sectors
= 0;
5202 mddev
->external_size
= 0;
5203 mddev
->dev_sectors
= 0;
5204 mddev
->raid_disks
= 0;
5205 mddev
->recovery_cp
= 0;
5206 mddev
->resync_min
= 0;
5207 mddev
->resync_max
= MaxSector
;
5208 mddev
->reshape_position
= MaxSector
;
5209 mddev
->external
= 0;
5210 mddev
->persistent
= 0;
5211 mddev
->level
= LEVEL_NONE
;
5212 mddev
->clevel
[0] = 0;
5215 mddev
->metadata_type
[0] = 0;
5216 mddev
->chunk_sectors
= 0;
5217 mddev
->ctime
= mddev
->utime
= 0;
5219 mddev
->max_disks
= 0;
5221 mddev
->can_decrease_events
= 0;
5222 mddev
->delta_disks
= 0;
5223 mddev
->reshape_backwards
= 0;
5224 mddev
->new_level
= LEVEL_NONE
;
5225 mddev
->new_layout
= 0;
5226 mddev
->new_chunk_sectors
= 0;
5227 mddev
->curr_resync
= 0;
5228 atomic64_set(&mddev
->resync_mismatches
, 0);
5229 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5230 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5231 mddev
->recovery
= 0;
5234 mddev
->degraded
= 0;
5235 mddev
->safemode
= 0;
5236 mddev
->merge_check_needed
= 0;
5237 mddev
->bitmap_info
.offset
= 0;
5238 mddev
->bitmap_info
.default_offset
= 0;
5239 mddev
->bitmap_info
.default_space
= 0;
5240 mddev
->bitmap_info
.chunksize
= 0;
5241 mddev
->bitmap_info
.daemon_sleep
= 0;
5242 mddev
->bitmap_info
.max_write_behind
= 0;
5245 static void __md_stop_writes(struct mddev
*mddev
)
5247 if (mddev_is_clustered(mddev
))
5248 md_cluster_ops
->metadata_update_start(mddev
);
5249 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5250 flush_workqueue(md_misc_wq
);
5251 if (mddev
->sync_thread
) {
5252 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5253 md_reap_sync_thread(mddev
);
5256 del_timer_sync(&mddev
->safemode_timer
);
5258 bitmap_flush(mddev
);
5259 md_super_wait(mddev
);
5261 if (mddev
->ro
== 0 &&
5262 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5263 /* mark array as shutdown cleanly */
5265 md_update_sb(mddev
, 1);
5267 if (mddev_is_clustered(mddev
))
5268 md_cluster_ops
->metadata_update_finish(mddev
);
5271 void md_stop_writes(struct mddev
*mddev
)
5273 mddev_lock_nointr(mddev
);
5274 __md_stop_writes(mddev
);
5275 mddev_unlock(mddev
);
5277 EXPORT_SYMBOL_GPL(md_stop_writes
);
5279 static void mddev_detach(struct mddev
*mddev
)
5281 struct bitmap
*bitmap
= mddev
->bitmap
;
5282 /* wait for behind writes to complete */
5283 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5284 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5286 /* need to kick something here to make sure I/O goes? */
5287 wait_event(bitmap
->behind_wait
,
5288 atomic_read(&bitmap
->behind_writes
) == 0);
5290 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5291 mddev
->pers
->quiesce(mddev
, 1);
5292 mddev
->pers
->quiesce(mddev
, 0);
5294 md_unregister_thread(&mddev
->thread
);
5296 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5299 static void __md_stop(struct mddev
*mddev
)
5301 struct md_personality
*pers
= mddev
->pers
;
5302 mddev_detach(mddev
);
5303 spin_lock(&mddev
->lock
);
5306 spin_unlock(&mddev
->lock
);
5307 pers
->free(mddev
, mddev
->private);
5308 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5309 mddev
->to_remove
= &md_redundancy_group
;
5310 module_put(pers
->owner
);
5311 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5314 void md_stop(struct mddev
*mddev
)
5316 /* stop the array and free an attached data structures.
5317 * This is called from dm-raid
5320 bitmap_destroy(mddev
);
5322 bioset_free(mddev
->bio_set
);
5325 EXPORT_SYMBOL_GPL(md_stop
);
5327 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5332 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5334 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5335 md_wakeup_thread(mddev
->thread
);
5337 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5338 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5339 if (mddev
->sync_thread
)
5340 /* Thread might be blocked waiting for metadata update
5341 * which will now never happen */
5342 wake_up_process(mddev
->sync_thread
->tsk
);
5344 mddev_unlock(mddev
);
5345 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5347 mddev_lock_nointr(mddev
);
5349 mutex_lock(&mddev
->open_mutex
);
5350 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5351 mddev
->sync_thread
||
5352 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5353 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5354 printk("md: %s still in use.\n",mdname(mddev
));
5356 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5357 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5358 md_wakeup_thread(mddev
->thread
);
5364 __md_stop_writes(mddev
);
5370 set_disk_ro(mddev
->gendisk
, 1);
5371 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5372 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5373 md_wakeup_thread(mddev
->thread
);
5374 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5378 mutex_unlock(&mddev
->open_mutex
);
5383 * 0 - completely stop and dis-assemble array
5384 * 2 - stop but do not disassemble array
5386 static int do_md_stop(struct mddev
*mddev
, int mode
,
5387 struct block_device
*bdev
)
5389 struct gendisk
*disk
= mddev
->gendisk
;
5390 struct md_rdev
*rdev
;
5393 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5395 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5396 md_wakeup_thread(mddev
->thread
);
5398 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5399 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5400 if (mddev
->sync_thread
)
5401 /* Thread might be blocked waiting for metadata update
5402 * which will now never happen */
5403 wake_up_process(mddev
->sync_thread
->tsk
);
5405 mddev_unlock(mddev
);
5406 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5407 !test_bit(MD_RECOVERY_RUNNING
,
5408 &mddev
->recovery
)));
5409 mddev_lock_nointr(mddev
);
5411 mutex_lock(&mddev
->open_mutex
);
5412 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5413 mddev
->sysfs_active
||
5414 mddev
->sync_thread
||
5415 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5416 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5417 printk("md: %s still in use.\n",mdname(mddev
));
5418 mutex_unlock(&mddev
->open_mutex
);
5420 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5421 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5422 md_wakeup_thread(mddev
->thread
);
5428 set_disk_ro(disk
, 0);
5430 __md_stop_writes(mddev
);
5432 mddev
->queue
->merge_bvec_fn
= NULL
;
5433 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5435 /* tell userspace to handle 'inactive' */
5436 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5438 rdev_for_each(rdev
, mddev
)
5439 if (rdev
->raid_disk
>= 0)
5440 sysfs_unlink_rdev(mddev
, rdev
);
5442 set_capacity(disk
, 0);
5443 mutex_unlock(&mddev
->open_mutex
);
5445 revalidate_disk(disk
);
5450 mutex_unlock(&mddev
->open_mutex
);
5452 * Free resources if final stop
5455 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5457 bitmap_destroy(mddev
);
5458 if (mddev
->bitmap_info
.file
) {
5459 struct file
*f
= mddev
->bitmap_info
.file
;
5460 spin_lock(&mddev
->lock
);
5461 mddev
->bitmap_info
.file
= NULL
;
5462 spin_unlock(&mddev
->lock
);
5465 mddev
->bitmap_info
.offset
= 0;
5467 export_array(mddev
);
5470 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5471 if (mddev
->hold_active
== UNTIL_STOP
)
5472 mddev
->hold_active
= 0;
5474 blk_integrity_unregister(disk
);
5475 md_new_event(mddev
);
5476 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5481 static void autorun_array(struct mddev
*mddev
)
5483 struct md_rdev
*rdev
;
5486 if (list_empty(&mddev
->disks
))
5489 printk(KERN_INFO
"md: running: ");
5491 rdev_for_each(rdev
, mddev
) {
5492 char b
[BDEVNAME_SIZE
];
5493 printk("<%s>", bdevname(rdev
->bdev
,b
));
5497 err
= do_md_run(mddev
);
5499 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5500 do_md_stop(mddev
, 0, NULL
);
5505 * lets try to run arrays based on all disks that have arrived
5506 * until now. (those are in pending_raid_disks)
5508 * the method: pick the first pending disk, collect all disks with
5509 * the same UUID, remove all from the pending list and put them into
5510 * the 'same_array' list. Then order this list based on superblock
5511 * update time (freshest comes first), kick out 'old' disks and
5512 * compare superblocks. If everything's fine then run it.
5514 * If "unit" is allocated, then bump its reference count
5516 static void autorun_devices(int part
)
5518 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5519 struct mddev
*mddev
;
5520 char b
[BDEVNAME_SIZE
];
5522 printk(KERN_INFO
"md: autorun ...\n");
5523 while (!list_empty(&pending_raid_disks
)) {
5526 LIST_HEAD(candidates
);
5527 rdev0
= list_entry(pending_raid_disks
.next
,
5528 struct md_rdev
, same_set
);
5530 printk(KERN_INFO
"md: considering %s ...\n",
5531 bdevname(rdev0
->bdev
,b
));
5532 INIT_LIST_HEAD(&candidates
);
5533 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5534 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5535 printk(KERN_INFO
"md: adding %s ...\n",
5536 bdevname(rdev
->bdev
,b
));
5537 list_move(&rdev
->same_set
, &candidates
);
5540 * now we have a set of devices, with all of them having
5541 * mostly sane superblocks. It's time to allocate the
5545 dev
= MKDEV(mdp_major
,
5546 rdev0
->preferred_minor
<< MdpMinorShift
);
5547 unit
= MINOR(dev
) >> MdpMinorShift
;
5549 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5552 if (rdev0
->preferred_minor
!= unit
) {
5553 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5554 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5558 md_probe(dev
, NULL
, NULL
);
5559 mddev
= mddev_find(dev
);
5560 if (!mddev
|| !mddev
->gendisk
) {
5564 "md: cannot allocate memory for md drive.\n");
5567 if (mddev_lock(mddev
))
5568 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5570 else if (mddev
->raid_disks
|| mddev
->major_version
5571 || !list_empty(&mddev
->disks
)) {
5573 "md: %s already running, cannot run %s\n",
5574 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5575 mddev_unlock(mddev
);
5577 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5578 mddev
->persistent
= 1;
5579 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5580 list_del_init(&rdev
->same_set
);
5581 if (bind_rdev_to_array(rdev
, mddev
))
5584 autorun_array(mddev
);
5585 mddev_unlock(mddev
);
5587 /* on success, candidates will be empty, on error
5590 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5591 list_del_init(&rdev
->same_set
);
5596 printk(KERN_INFO
"md: ... autorun DONE.\n");
5598 #endif /* !MODULE */
5600 static int get_version(void __user
*arg
)
5604 ver
.major
= MD_MAJOR_VERSION
;
5605 ver
.minor
= MD_MINOR_VERSION
;
5606 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5608 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5614 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5616 mdu_array_info_t info
;
5617 int nr
,working
,insync
,failed
,spare
;
5618 struct md_rdev
*rdev
;
5620 nr
= working
= insync
= failed
= spare
= 0;
5622 rdev_for_each_rcu(rdev
, mddev
) {
5624 if (test_bit(Faulty
, &rdev
->flags
))
5628 if (test_bit(In_sync
, &rdev
->flags
))
5636 info
.major_version
= mddev
->major_version
;
5637 info
.minor_version
= mddev
->minor_version
;
5638 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5639 info
.ctime
= mddev
->ctime
;
5640 info
.level
= mddev
->level
;
5641 info
.size
= mddev
->dev_sectors
/ 2;
5642 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5645 info
.raid_disks
= mddev
->raid_disks
;
5646 info
.md_minor
= mddev
->md_minor
;
5647 info
.not_persistent
= !mddev
->persistent
;
5649 info
.utime
= mddev
->utime
;
5652 info
.state
= (1<<MD_SB_CLEAN
);
5653 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5654 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5655 if (mddev_is_clustered(mddev
))
5656 info
.state
|= (1<<MD_SB_CLUSTERED
);
5658 info
.active_disks
= insync
;
5659 info
.working_disks
= working
;
5660 info
.failed_disks
= failed
;
5661 info
.spare_disks
= spare
;
5663 info
.layout
= mddev
->layout
;
5664 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5666 if (copy_to_user(arg
, &info
, sizeof(info
)))
5672 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5674 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5678 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5683 spin_lock(&mddev
->lock
);
5684 /* bitmap disabled, zero the first byte and copy out */
5685 if (!mddev
->bitmap_info
.file
)
5686 file
->pathname
[0] = '\0';
5687 else if ((ptr
= d_path(&mddev
->bitmap_info
.file
->f_path
,
5688 file
->pathname
, sizeof(file
->pathname
))),
5692 memmove(file
->pathname
, ptr
,
5693 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5694 spin_unlock(&mddev
->lock
);
5697 copy_to_user(arg
, file
, sizeof(*file
)))
5704 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5706 mdu_disk_info_t info
;
5707 struct md_rdev
*rdev
;
5709 if (copy_from_user(&info
, arg
, sizeof(info
)))
5713 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5715 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5716 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5717 info
.raid_disk
= rdev
->raid_disk
;
5719 if (test_bit(Faulty
, &rdev
->flags
))
5720 info
.state
|= (1<<MD_DISK_FAULTY
);
5721 else if (test_bit(In_sync
, &rdev
->flags
)) {
5722 info
.state
|= (1<<MD_DISK_ACTIVE
);
5723 info
.state
|= (1<<MD_DISK_SYNC
);
5725 if (test_bit(WriteMostly
, &rdev
->flags
))
5726 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5728 info
.major
= info
.minor
= 0;
5729 info
.raid_disk
= -1;
5730 info
.state
= (1<<MD_DISK_REMOVED
);
5734 if (copy_to_user(arg
, &info
, sizeof(info
)))
5740 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5742 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5743 struct md_rdev
*rdev
;
5744 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5746 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5749 if (!mddev
->raid_disks
) {
5751 /* expecting a device which has a superblock */
5752 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5755 "md: md_import_device returned %ld\n",
5757 return PTR_ERR(rdev
);
5759 if (!list_empty(&mddev
->disks
)) {
5760 struct md_rdev
*rdev0
5761 = list_entry(mddev
->disks
.next
,
5762 struct md_rdev
, same_set
);
5763 err
= super_types
[mddev
->major_version
]
5764 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5767 "md: %s has different UUID to %s\n",
5768 bdevname(rdev
->bdev
,b
),
5769 bdevname(rdev0
->bdev
,b2
));
5774 err
= bind_rdev_to_array(rdev
, mddev
);
5781 * add_new_disk can be used once the array is assembled
5782 * to add "hot spares". They must already have a superblock
5787 if (!mddev
->pers
->hot_add_disk
) {
5789 "%s: personality does not support diskops!\n",
5793 if (mddev
->persistent
)
5794 rdev
= md_import_device(dev
, mddev
->major_version
,
5795 mddev
->minor_version
);
5797 rdev
= md_import_device(dev
, -1, -1);
5800 "md: md_import_device returned %ld\n",
5802 return PTR_ERR(rdev
);
5804 /* set saved_raid_disk if appropriate */
5805 if (!mddev
->persistent
) {
5806 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5807 info
->raid_disk
< mddev
->raid_disks
) {
5808 rdev
->raid_disk
= info
->raid_disk
;
5809 set_bit(In_sync
, &rdev
->flags
);
5810 clear_bit(Bitmap_sync
, &rdev
->flags
);
5812 rdev
->raid_disk
= -1;
5813 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5815 super_types
[mddev
->major_version
].
5816 validate_super(mddev
, rdev
);
5817 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5818 rdev
->raid_disk
!= info
->raid_disk
) {
5819 /* This was a hot-add request, but events doesn't
5820 * match, so reject it.
5826 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5827 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5828 set_bit(WriteMostly
, &rdev
->flags
);
5830 clear_bit(WriteMostly
, &rdev
->flags
);
5832 rdev
->raid_disk
= -1;
5833 err
= bind_rdev_to_array(rdev
, mddev
);
5834 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5835 /* If there is hot_add_disk but no hot_remove_disk
5836 * then added disks for geometry changes,
5837 * and should be added immediately.
5839 super_types
[mddev
->major_version
].
5840 validate_super(mddev
, rdev
);
5841 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5843 unbind_rdev_from_array(rdev
);
5848 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5850 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5851 if (mddev
->degraded
)
5852 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5853 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5855 md_new_event(mddev
);
5856 md_wakeup_thread(mddev
->thread
);
5860 /* otherwise, add_new_disk is only allowed
5861 * for major_version==0 superblocks
5863 if (mddev
->major_version
!= 0) {
5864 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5869 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5871 rdev
= md_import_device(dev
, -1, 0);
5874 "md: error, md_import_device() returned %ld\n",
5876 return PTR_ERR(rdev
);
5878 rdev
->desc_nr
= info
->number
;
5879 if (info
->raid_disk
< mddev
->raid_disks
)
5880 rdev
->raid_disk
= info
->raid_disk
;
5882 rdev
->raid_disk
= -1;
5884 if (rdev
->raid_disk
< mddev
->raid_disks
)
5885 if (info
->state
& (1<<MD_DISK_SYNC
))
5886 set_bit(In_sync
, &rdev
->flags
);
5888 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5889 set_bit(WriteMostly
, &rdev
->flags
);
5891 if (!mddev
->persistent
) {
5892 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5893 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5895 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5896 rdev
->sectors
= rdev
->sb_start
;
5898 err
= bind_rdev_to_array(rdev
, mddev
);
5908 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5910 char b
[BDEVNAME_SIZE
];
5911 struct md_rdev
*rdev
;
5913 rdev
= find_rdev(mddev
, dev
);
5917 if (mddev_is_clustered(mddev
))
5918 md_cluster_ops
->metadata_update_start(mddev
);
5920 clear_bit(Blocked
, &rdev
->flags
);
5921 remove_and_add_spares(mddev
, rdev
);
5923 if (rdev
->raid_disk
>= 0)
5926 kick_rdev_from_array(rdev
);
5927 md_update_sb(mddev
, 1);
5928 md_new_event(mddev
);
5930 if (mddev_is_clustered(mddev
))
5931 md_cluster_ops
->metadata_update_finish(mddev
);
5935 if (mddev_is_clustered(mddev
))
5936 md_cluster_ops
->metadata_update_cancel(mddev
);
5937 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5938 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5942 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5944 char b
[BDEVNAME_SIZE
];
5946 struct md_rdev
*rdev
;
5951 if (mddev
->major_version
!= 0) {
5952 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5953 " version-0 superblocks.\n",
5957 if (!mddev
->pers
->hot_add_disk
) {
5959 "%s: personality does not support diskops!\n",
5964 rdev
= md_import_device(dev
, -1, 0);
5967 "md: error, md_import_device() returned %ld\n",
5972 if (mddev
->persistent
)
5973 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5975 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5977 rdev
->sectors
= rdev
->sb_start
;
5979 if (test_bit(Faulty
, &rdev
->flags
)) {
5981 "md: can not hot-add faulty %s disk to %s!\n",
5982 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5987 if (mddev_is_clustered(mddev
))
5988 md_cluster_ops
->metadata_update_start(mddev
);
5989 clear_bit(In_sync
, &rdev
->flags
);
5991 rdev
->saved_raid_disk
= -1;
5992 err
= bind_rdev_to_array(rdev
, mddev
);
5994 goto abort_clustered
;
5997 * The rest should better be atomic, we can have disk failures
5998 * noticed in interrupt contexts ...
6001 rdev
->raid_disk
= -1;
6003 md_update_sb(mddev
, 1);
6005 if (mddev_is_clustered(mddev
))
6006 md_cluster_ops
->metadata_update_finish(mddev
);
6008 * Kick recovery, maybe this spare has to be added to the
6009 * array immediately.
6011 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6012 md_wakeup_thread(mddev
->thread
);
6013 md_new_event(mddev
);
6017 if (mddev_is_clustered(mddev
))
6018 md_cluster_ops
->metadata_update_cancel(mddev
);
6024 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6029 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6031 if (mddev
->recovery
|| mddev
->sync_thread
)
6033 /* we should be able to change the bitmap.. */
6037 struct inode
*inode
;
6040 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6041 return -EEXIST
; /* cannot add when bitmap is present */
6045 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6050 inode
= f
->f_mapping
->host
;
6051 if (!S_ISREG(inode
->i_mode
)) {
6052 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6055 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6056 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6059 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6060 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6068 mddev
->bitmap_info
.file
= f
;
6069 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6070 } else if (mddev
->bitmap
== NULL
)
6071 return -ENOENT
; /* cannot remove what isn't there */
6074 mddev
->pers
->quiesce(mddev
, 1);
6076 struct bitmap
*bitmap
;
6078 bitmap
= bitmap_create(mddev
, -1);
6079 if (!IS_ERR(bitmap
)) {
6080 mddev
->bitmap
= bitmap
;
6081 err
= bitmap_load(mddev
);
6084 if (fd
< 0 || err
) {
6085 bitmap_destroy(mddev
);
6086 fd
= -1; /* make sure to put the file */
6088 mddev
->pers
->quiesce(mddev
, 0);
6091 struct file
*f
= mddev
->bitmap_info
.file
;
6093 spin_lock(&mddev
->lock
);
6094 mddev
->bitmap_info
.file
= NULL
;
6095 spin_unlock(&mddev
->lock
);
6104 * set_array_info is used two different ways
6105 * The original usage is when creating a new array.
6106 * In this usage, raid_disks is > 0 and it together with
6107 * level, size, not_persistent,layout,chunksize determine the
6108 * shape of the array.
6109 * This will always create an array with a type-0.90.0 superblock.
6110 * The newer usage is when assembling an array.
6111 * In this case raid_disks will be 0, and the major_version field is
6112 * use to determine which style super-blocks are to be found on the devices.
6113 * The minor and patch _version numbers are also kept incase the
6114 * super_block handler wishes to interpret them.
6116 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6119 if (info
->raid_disks
== 0) {
6120 /* just setting version number for superblock loading */
6121 if (info
->major_version
< 0 ||
6122 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6123 super_types
[info
->major_version
].name
== NULL
) {
6124 /* maybe try to auto-load a module? */
6126 "md: superblock version %d not known\n",
6127 info
->major_version
);
6130 mddev
->major_version
= info
->major_version
;
6131 mddev
->minor_version
= info
->minor_version
;
6132 mddev
->patch_version
= info
->patch_version
;
6133 mddev
->persistent
= !info
->not_persistent
;
6134 /* ensure mddev_put doesn't delete this now that there
6135 * is some minimal configuration.
6137 mddev
->ctime
= get_seconds();
6140 mddev
->major_version
= MD_MAJOR_VERSION
;
6141 mddev
->minor_version
= MD_MINOR_VERSION
;
6142 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6143 mddev
->ctime
= get_seconds();
6145 mddev
->level
= info
->level
;
6146 mddev
->clevel
[0] = 0;
6147 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6148 mddev
->raid_disks
= info
->raid_disks
;
6149 /* don't set md_minor, it is determined by which /dev/md* was
6152 if (info
->state
& (1<<MD_SB_CLEAN
))
6153 mddev
->recovery_cp
= MaxSector
;
6155 mddev
->recovery_cp
= 0;
6156 mddev
->persistent
= ! info
->not_persistent
;
6157 mddev
->external
= 0;
6159 mddev
->layout
= info
->layout
;
6160 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6162 mddev
->max_disks
= MD_SB_DISKS
;
6164 if (mddev
->persistent
)
6166 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6168 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6169 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6170 mddev
->bitmap_info
.offset
= 0;
6172 mddev
->reshape_position
= MaxSector
;
6175 * Generate a 128 bit UUID
6177 get_random_bytes(mddev
->uuid
, 16);
6179 mddev
->new_level
= mddev
->level
;
6180 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6181 mddev
->new_layout
= mddev
->layout
;
6182 mddev
->delta_disks
= 0;
6183 mddev
->reshape_backwards
= 0;
6188 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6190 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6192 if (mddev
->external_size
)
6195 mddev
->array_sectors
= array_sectors
;
6197 EXPORT_SYMBOL(md_set_array_sectors
);
6199 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6201 struct md_rdev
*rdev
;
6203 int fit
= (num_sectors
== 0);
6205 if (mddev
->pers
->resize
== NULL
)
6207 /* The "num_sectors" is the number of sectors of each device that
6208 * is used. This can only make sense for arrays with redundancy.
6209 * linear and raid0 always use whatever space is available. We can only
6210 * consider changing this number if no resync or reconstruction is
6211 * happening, and if the new size is acceptable. It must fit before the
6212 * sb_start or, if that is <data_offset, it must fit before the size
6213 * of each device. If num_sectors is zero, we find the largest size
6216 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6222 rdev_for_each(rdev
, mddev
) {
6223 sector_t avail
= rdev
->sectors
;
6225 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6226 num_sectors
= avail
;
6227 if (avail
< num_sectors
)
6230 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6232 revalidate_disk(mddev
->gendisk
);
6236 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6239 struct md_rdev
*rdev
;
6240 /* change the number of raid disks */
6241 if (mddev
->pers
->check_reshape
== NULL
)
6245 if (raid_disks
<= 0 ||
6246 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6248 if (mddev
->sync_thread
||
6249 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6250 mddev
->reshape_position
!= MaxSector
)
6253 rdev_for_each(rdev
, mddev
) {
6254 if (mddev
->raid_disks
< raid_disks
&&
6255 rdev
->data_offset
< rdev
->new_data_offset
)
6257 if (mddev
->raid_disks
> raid_disks
&&
6258 rdev
->data_offset
> rdev
->new_data_offset
)
6262 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6263 if (mddev
->delta_disks
< 0)
6264 mddev
->reshape_backwards
= 1;
6265 else if (mddev
->delta_disks
> 0)
6266 mddev
->reshape_backwards
= 0;
6268 rv
= mddev
->pers
->check_reshape(mddev
);
6270 mddev
->delta_disks
= 0;
6271 mddev
->reshape_backwards
= 0;
6277 * update_array_info is used to change the configuration of an
6279 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6280 * fields in the info are checked against the array.
6281 * Any differences that cannot be handled will cause an error.
6282 * Normally, only one change can be managed at a time.
6284 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6290 /* calculate expected state,ignoring low bits */
6291 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6292 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6294 if (mddev
->major_version
!= info
->major_version
||
6295 mddev
->minor_version
!= info
->minor_version
||
6296 /* mddev->patch_version != info->patch_version || */
6297 mddev
->ctime
!= info
->ctime
||
6298 mddev
->level
!= info
->level
||
6299 /* mddev->layout != info->layout || */
6300 !mddev
->persistent
!= info
->not_persistent
||
6301 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6302 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6303 ((state
^info
->state
) & 0xfffffe00)
6306 /* Check there is only one change */
6307 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6309 if (mddev
->raid_disks
!= info
->raid_disks
)
6311 if (mddev
->layout
!= info
->layout
)
6313 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6320 if (mddev
->layout
!= info
->layout
) {
6322 * we don't need to do anything at the md level, the
6323 * personality will take care of it all.
6325 if (mddev
->pers
->check_reshape
== NULL
)
6328 mddev
->new_layout
= info
->layout
;
6329 rv
= mddev
->pers
->check_reshape(mddev
);
6331 mddev
->new_layout
= mddev
->layout
;
6335 if (mddev_is_clustered(mddev
))
6336 md_cluster_ops
->metadata_update_start(mddev
);
6337 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6338 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6340 if (mddev
->raid_disks
!= info
->raid_disks
)
6341 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6343 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6344 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6348 if (mddev
->recovery
|| mddev
->sync_thread
) {
6352 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6353 struct bitmap
*bitmap
;
6354 /* add the bitmap */
6355 if (mddev
->bitmap
) {
6359 if (mddev
->bitmap_info
.default_offset
== 0) {
6363 mddev
->bitmap_info
.offset
=
6364 mddev
->bitmap_info
.default_offset
;
6365 mddev
->bitmap_info
.space
=
6366 mddev
->bitmap_info
.default_space
;
6367 mddev
->pers
->quiesce(mddev
, 1);
6368 bitmap
= bitmap_create(mddev
, -1);
6369 if (!IS_ERR(bitmap
)) {
6370 mddev
->bitmap
= bitmap
;
6371 rv
= bitmap_load(mddev
);
6374 bitmap_destroy(mddev
);
6375 mddev
->pers
->quiesce(mddev
, 0);
6377 /* remove the bitmap */
6378 if (!mddev
->bitmap
) {
6382 if (mddev
->bitmap
->storage
.file
) {
6386 mddev
->pers
->quiesce(mddev
, 1);
6387 bitmap_destroy(mddev
);
6388 mddev
->pers
->quiesce(mddev
, 0);
6389 mddev
->bitmap_info
.offset
= 0;
6392 md_update_sb(mddev
, 1);
6393 if (mddev_is_clustered(mddev
))
6394 md_cluster_ops
->metadata_update_finish(mddev
);
6397 if (mddev_is_clustered(mddev
))
6398 md_cluster_ops
->metadata_update_cancel(mddev
);
6402 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6404 struct md_rdev
*rdev
;
6407 if (mddev
->pers
== NULL
)
6411 rdev
= find_rdev_rcu(mddev
, dev
);
6415 md_error(mddev
, rdev
);
6416 if (!test_bit(Faulty
, &rdev
->flags
))
6424 * We have a problem here : there is no easy way to give a CHS
6425 * virtual geometry. We currently pretend that we have a 2 heads
6426 * 4 sectors (with a BIG number of cylinders...). This drives
6427 * dosfs just mad... ;-)
6429 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6431 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6435 geo
->cylinders
= mddev
->array_sectors
/ 8;
6439 static inline bool md_ioctl_valid(unsigned int cmd
)
6444 case GET_ARRAY_INFO
:
6445 case GET_BITMAP_FILE
:
6448 case HOT_REMOVE_DISK
:
6451 case RESTART_ARRAY_RW
:
6453 case SET_ARRAY_INFO
:
6454 case SET_BITMAP_FILE
:
6455 case SET_DISK_FAULTY
:
6464 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6465 unsigned int cmd
, unsigned long arg
)
6468 void __user
*argp
= (void __user
*)arg
;
6469 struct mddev
*mddev
= NULL
;
6472 if (!md_ioctl_valid(cmd
))
6477 case GET_ARRAY_INFO
:
6481 if (!capable(CAP_SYS_ADMIN
))
6486 * Commands dealing with the RAID driver but not any
6491 err
= get_version(argp
);
6497 autostart_arrays(arg
);
6504 * Commands creating/starting a new array:
6507 mddev
= bdev
->bd_disk
->private_data
;
6514 /* Some actions do not requires the mutex */
6516 case GET_ARRAY_INFO
:
6517 if (!mddev
->raid_disks
&& !mddev
->external
)
6520 err
= get_array_info(mddev
, argp
);
6524 if (!mddev
->raid_disks
&& !mddev
->external
)
6527 err
= get_disk_info(mddev
, argp
);
6530 case SET_DISK_FAULTY
:
6531 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6534 case GET_BITMAP_FILE
:
6535 err
= get_bitmap_file(mddev
, argp
);
6540 if (cmd
== ADD_NEW_DISK
)
6541 /* need to ensure md_delayed_delete() has completed */
6542 flush_workqueue(md_misc_wq
);
6544 if (cmd
== HOT_REMOVE_DISK
)
6545 /* need to ensure recovery thread has run */
6546 wait_event_interruptible_timeout(mddev
->sb_wait
,
6547 !test_bit(MD_RECOVERY_NEEDED
,
6549 msecs_to_jiffies(5000));
6550 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6551 /* Need to flush page cache, and ensure no-one else opens
6554 mutex_lock(&mddev
->open_mutex
);
6555 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6556 mutex_unlock(&mddev
->open_mutex
);
6560 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6561 mutex_unlock(&mddev
->open_mutex
);
6562 sync_blockdev(bdev
);
6564 err
= mddev_lock(mddev
);
6567 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6572 if (cmd
== SET_ARRAY_INFO
) {
6573 mdu_array_info_t info
;
6575 memset(&info
, 0, sizeof(info
));
6576 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6581 err
= update_array_info(mddev
, &info
);
6583 printk(KERN_WARNING
"md: couldn't update"
6584 " array info. %d\n", err
);
6589 if (!list_empty(&mddev
->disks
)) {
6591 "md: array %s already has disks!\n",
6596 if (mddev
->raid_disks
) {
6598 "md: array %s already initialised!\n",
6603 err
= set_array_info(mddev
, &info
);
6605 printk(KERN_WARNING
"md: couldn't set"
6606 " array info. %d\n", err
);
6613 * Commands querying/configuring an existing array:
6615 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6616 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6617 if ((!mddev
->raid_disks
&& !mddev
->external
)
6618 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6619 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6620 && cmd
!= GET_BITMAP_FILE
) {
6626 * Commands even a read-only array can execute:
6629 case RESTART_ARRAY_RW
:
6630 err
= restart_array(mddev
);
6634 err
= do_md_stop(mddev
, 0, bdev
);
6638 err
= md_set_readonly(mddev
, bdev
);
6641 case HOT_REMOVE_DISK
:
6642 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6646 /* We can support ADD_NEW_DISK on read-only arrays
6647 * on if we are re-adding a preexisting device.
6648 * So require mddev->pers and MD_DISK_SYNC.
6651 mdu_disk_info_t info
;
6652 if (copy_from_user(&info
, argp
, sizeof(info
)))
6654 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6655 /* Need to clear read-only for this */
6658 err
= add_new_disk(mddev
, &info
);
6664 if (get_user(ro
, (int __user
*)(arg
))) {
6670 /* if the bdev is going readonly the value of mddev->ro
6671 * does not matter, no writes are coming
6676 /* are we are already prepared for writes? */
6680 /* transitioning to readauto need only happen for
6681 * arrays that call md_write_start
6684 err
= restart_array(mddev
);
6687 set_disk_ro(mddev
->gendisk
, 0);
6694 * The remaining ioctls are changing the state of the
6695 * superblock, so we do not allow them on read-only arrays.
6697 if (mddev
->ro
&& mddev
->pers
) {
6698 if (mddev
->ro
== 2) {
6700 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6701 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6702 /* mddev_unlock will wake thread */
6703 /* If a device failed while we were read-only, we
6704 * need to make sure the metadata is updated now.
6706 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6707 mddev_unlock(mddev
);
6708 wait_event(mddev
->sb_wait
,
6709 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6710 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6711 mddev_lock_nointr(mddev
);
6722 mdu_disk_info_t info
;
6723 if (copy_from_user(&info
, argp
, sizeof(info
)))
6726 err
= add_new_disk(mddev
, &info
);
6731 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6735 err
= do_md_run(mddev
);
6738 case SET_BITMAP_FILE
:
6739 err
= set_bitmap_file(mddev
, (int)arg
);
6748 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6750 mddev
->hold_active
= 0;
6751 mddev_unlock(mddev
);
6755 #ifdef CONFIG_COMPAT
6756 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6757 unsigned int cmd
, unsigned long arg
)
6760 case HOT_REMOVE_DISK
:
6762 case SET_DISK_FAULTY
:
6763 case SET_BITMAP_FILE
:
6764 /* These take in integer arg, do not convert */
6767 arg
= (unsigned long)compat_ptr(arg
);
6771 return md_ioctl(bdev
, mode
, cmd
, arg
);
6773 #endif /* CONFIG_COMPAT */
6775 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6778 * Succeed if we can lock the mddev, which confirms that
6779 * it isn't being stopped right now.
6781 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6787 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6788 /* we are racing with mddev_put which is discarding this
6792 /* Wait until bdev->bd_disk is definitely gone */
6793 flush_workqueue(md_misc_wq
);
6794 /* Then retry the open from the top */
6795 return -ERESTARTSYS
;
6797 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6799 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6803 atomic_inc(&mddev
->openers
);
6804 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6805 mutex_unlock(&mddev
->open_mutex
);
6807 check_disk_change(bdev
);
6812 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6814 struct mddev
*mddev
= disk
->private_data
;
6817 atomic_dec(&mddev
->openers
);
6821 static int md_media_changed(struct gendisk
*disk
)
6823 struct mddev
*mddev
= disk
->private_data
;
6825 return mddev
->changed
;
6828 static int md_revalidate(struct gendisk
*disk
)
6830 struct mddev
*mddev
= disk
->private_data
;
6835 static const struct block_device_operations md_fops
=
6837 .owner
= THIS_MODULE
,
6839 .release
= md_release
,
6841 #ifdef CONFIG_COMPAT
6842 .compat_ioctl
= md_compat_ioctl
,
6844 .getgeo
= md_getgeo
,
6845 .media_changed
= md_media_changed
,
6846 .revalidate_disk
= md_revalidate
,
6849 static int md_thread(void *arg
)
6851 struct md_thread
*thread
= arg
;
6854 * md_thread is a 'system-thread', it's priority should be very
6855 * high. We avoid resource deadlocks individually in each
6856 * raid personality. (RAID5 does preallocation) We also use RR and
6857 * the very same RT priority as kswapd, thus we will never get
6858 * into a priority inversion deadlock.
6860 * we definitely have to have equal or higher priority than
6861 * bdflush, otherwise bdflush will deadlock if there are too
6862 * many dirty RAID5 blocks.
6865 allow_signal(SIGKILL
);
6866 while (!kthread_should_stop()) {
6868 /* We need to wait INTERRUPTIBLE so that
6869 * we don't add to the load-average.
6870 * That means we need to be sure no signals are
6873 if (signal_pending(current
))
6874 flush_signals(current
);
6876 wait_event_interruptible_timeout
6878 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6879 || kthread_should_stop(),
6882 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6883 if (!kthread_should_stop())
6884 thread
->run(thread
);
6890 void md_wakeup_thread(struct md_thread
*thread
)
6893 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6894 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6895 wake_up(&thread
->wqueue
);
6898 EXPORT_SYMBOL(md_wakeup_thread
);
6900 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6901 struct mddev
*mddev
, const char *name
)
6903 struct md_thread
*thread
;
6905 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6909 init_waitqueue_head(&thread
->wqueue
);
6912 thread
->mddev
= mddev
;
6913 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6914 thread
->tsk
= kthread_run(md_thread
, thread
,
6916 mdname(thread
->mddev
),
6918 if (IS_ERR(thread
->tsk
)) {
6924 EXPORT_SYMBOL(md_register_thread
);
6926 void md_unregister_thread(struct md_thread
**threadp
)
6928 struct md_thread
*thread
= *threadp
;
6931 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6932 /* Locking ensures that mddev_unlock does not wake_up a
6933 * non-existent thread
6935 spin_lock(&pers_lock
);
6937 spin_unlock(&pers_lock
);
6939 kthread_stop(thread
->tsk
);
6942 EXPORT_SYMBOL(md_unregister_thread
);
6944 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6946 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6949 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6951 mddev
->pers
->error_handler(mddev
,rdev
);
6952 if (mddev
->degraded
)
6953 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6954 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6955 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6956 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6957 md_wakeup_thread(mddev
->thread
);
6958 if (mddev
->event_work
.func
)
6959 queue_work(md_misc_wq
, &mddev
->event_work
);
6960 md_new_event_inintr(mddev
);
6962 EXPORT_SYMBOL(md_error
);
6964 /* seq_file implementation /proc/mdstat */
6966 static void status_unused(struct seq_file
*seq
)
6969 struct md_rdev
*rdev
;
6971 seq_printf(seq
, "unused devices: ");
6973 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6974 char b
[BDEVNAME_SIZE
];
6976 seq_printf(seq
, "%s ",
6977 bdevname(rdev
->bdev
,b
));
6980 seq_printf(seq
, "<none>");
6982 seq_printf(seq
, "\n");
6985 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
6987 sector_t max_sectors
, resync
, res
;
6988 unsigned long dt
, db
;
6991 unsigned int per_milli
;
6993 if (mddev
->curr_resync
<= 3)
6996 resync
= mddev
->curr_resync
6997 - atomic_read(&mddev
->recovery_active
);
6999 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7000 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7001 max_sectors
= mddev
->resync_max_sectors
;
7003 max_sectors
= mddev
->dev_sectors
;
7005 WARN_ON(max_sectors
== 0);
7006 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7007 * in a sector_t, and (max_sectors>>scale) will fit in a
7008 * u32, as those are the requirements for sector_div.
7009 * Thus 'scale' must be at least 10
7012 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7013 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7016 res
= (resync
>>scale
)*1000;
7017 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7021 int i
, x
= per_milli
/50, y
= 20-x
;
7022 seq_printf(seq
, "[");
7023 for (i
= 0; i
< x
; i
++)
7024 seq_printf(seq
, "=");
7025 seq_printf(seq
, ">");
7026 for (i
= 0; i
< y
; i
++)
7027 seq_printf(seq
, ".");
7028 seq_printf(seq
, "] ");
7030 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7031 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7033 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7035 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7036 "resync" : "recovery"))),
7037 per_milli
/10, per_milli
% 10,
7038 (unsigned long long) resync
/2,
7039 (unsigned long long) max_sectors
/2);
7042 * dt: time from mark until now
7043 * db: blocks written from mark until now
7044 * rt: remaining time
7046 * rt is a sector_t, so could be 32bit or 64bit.
7047 * So we divide before multiply in case it is 32bit and close
7049 * We scale the divisor (db) by 32 to avoid losing precision
7050 * near the end of resync when the number of remaining sectors
7052 * We then divide rt by 32 after multiplying by db to compensate.
7053 * The '+1' avoids division by zero if db is very small.
7055 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7057 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7058 - mddev
->resync_mark_cnt
;
7060 rt
= max_sectors
- resync
; /* number of remaining sectors */
7061 sector_div(rt
, db
/32+1);
7065 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7066 ((unsigned long)rt
% 60)/6);
7068 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7071 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7073 struct list_head
*tmp
;
7075 struct mddev
*mddev
;
7083 spin_lock(&all_mddevs_lock
);
7084 list_for_each(tmp
,&all_mddevs
)
7086 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7088 spin_unlock(&all_mddevs_lock
);
7091 spin_unlock(&all_mddevs_lock
);
7093 return (void*)2;/* tail */
7097 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7099 struct list_head
*tmp
;
7100 struct mddev
*next_mddev
, *mddev
= v
;
7106 spin_lock(&all_mddevs_lock
);
7108 tmp
= all_mddevs
.next
;
7110 tmp
= mddev
->all_mddevs
.next
;
7111 if (tmp
!= &all_mddevs
)
7112 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7114 next_mddev
= (void*)2;
7117 spin_unlock(&all_mddevs_lock
);
7125 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7127 struct mddev
*mddev
= v
;
7129 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7133 static int md_seq_show(struct seq_file
*seq
, void *v
)
7135 struct mddev
*mddev
= v
;
7137 struct md_rdev
*rdev
;
7139 if (v
== (void*)1) {
7140 struct md_personality
*pers
;
7141 seq_printf(seq
, "Personalities : ");
7142 spin_lock(&pers_lock
);
7143 list_for_each_entry(pers
, &pers_list
, list
)
7144 seq_printf(seq
, "[%s] ", pers
->name
);
7146 spin_unlock(&pers_lock
);
7147 seq_printf(seq
, "\n");
7148 seq
->poll_event
= atomic_read(&md_event_count
);
7151 if (v
== (void*)2) {
7156 spin_lock(&mddev
->lock
);
7157 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7158 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7159 mddev
->pers
? "" : "in");
7162 seq_printf(seq
, " (read-only)");
7164 seq_printf(seq
, " (auto-read-only)");
7165 seq_printf(seq
, " %s", mddev
->pers
->name
);
7170 rdev_for_each_rcu(rdev
, mddev
) {
7171 char b
[BDEVNAME_SIZE
];
7172 seq_printf(seq
, " %s[%d]",
7173 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7174 if (test_bit(WriteMostly
, &rdev
->flags
))
7175 seq_printf(seq
, "(W)");
7176 if (test_bit(Faulty
, &rdev
->flags
)) {
7177 seq_printf(seq
, "(F)");
7180 if (rdev
->raid_disk
< 0)
7181 seq_printf(seq
, "(S)"); /* spare */
7182 if (test_bit(Replacement
, &rdev
->flags
))
7183 seq_printf(seq
, "(R)");
7184 sectors
+= rdev
->sectors
;
7188 if (!list_empty(&mddev
->disks
)) {
7190 seq_printf(seq
, "\n %llu blocks",
7191 (unsigned long long)
7192 mddev
->array_sectors
/ 2);
7194 seq_printf(seq
, "\n %llu blocks",
7195 (unsigned long long)sectors
/ 2);
7197 if (mddev
->persistent
) {
7198 if (mddev
->major_version
!= 0 ||
7199 mddev
->minor_version
!= 90) {
7200 seq_printf(seq
," super %d.%d",
7201 mddev
->major_version
,
7202 mddev
->minor_version
);
7204 } else if (mddev
->external
)
7205 seq_printf(seq
, " super external:%s",
7206 mddev
->metadata_type
);
7208 seq_printf(seq
, " super non-persistent");
7211 mddev
->pers
->status(seq
, mddev
);
7212 seq_printf(seq
, "\n ");
7213 if (mddev
->pers
->sync_request
) {
7214 if (mddev
->curr_resync
> 2) {
7215 status_resync(seq
, mddev
);
7216 seq_printf(seq
, "\n ");
7217 } else if (mddev
->curr_resync
>= 1)
7218 seq_printf(seq
, "\tresync=DELAYED\n ");
7219 else if (mddev
->recovery_cp
< MaxSector
)
7220 seq_printf(seq
, "\tresync=PENDING\n ");
7223 seq_printf(seq
, "\n ");
7225 bitmap_status(seq
, mddev
->bitmap
);
7227 seq_printf(seq
, "\n");
7229 spin_unlock(&mddev
->lock
);
7234 static const struct seq_operations md_seq_ops
= {
7235 .start
= md_seq_start
,
7236 .next
= md_seq_next
,
7237 .stop
= md_seq_stop
,
7238 .show
= md_seq_show
,
7241 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7243 struct seq_file
*seq
;
7246 error
= seq_open(file
, &md_seq_ops
);
7250 seq
= file
->private_data
;
7251 seq
->poll_event
= atomic_read(&md_event_count
);
7255 static int md_unloading
;
7256 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7258 struct seq_file
*seq
= filp
->private_data
;
7262 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7263 poll_wait(filp
, &md_event_waiters
, wait
);
7265 /* always allow read */
7266 mask
= POLLIN
| POLLRDNORM
;
7268 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7269 mask
|= POLLERR
| POLLPRI
;
7273 static const struct file_operations md_seq_fops
= {
7274 .owner
= THIS_MODULE
,
7275 .open
= md_seq_open
,
7277 .llseek
= seq_lseek
,
7278 .release
= seq_release_private
,
7279 .poll
= mdstat_poll
,
7282 int register_md_personality(struct md_personality
*p
)
7284 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7286 spin_lock(&pers_lock
);
7287 list_add_tail(&p
->list
, &pers_list
);
7288 spin_unlock(&pers_lock
);
7291 EXPORT_SYMBOL(register_md_personality
);
7293 int unregister_md_personality(struct md_personality
*p
)
7295 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7296 spin_lock(&pers_lock
);
7297 list_del_init(&p
->list
);
7298 spin_unlock(&pers_lock
);
7301 EXPORT_SYMBOL(unregister_md_personality
);
7303 int register_md_cluster_operations(struct md_cluster_operations
*ops
, struct module
*module
)
7305 if (md_cluster_ops
!= NULL
)
7307 spin_lock(&pers_lock
);
7308 md_cluster_ops
= ops
;
7309 md_cluster_mod
= module
;
7310 spin_unlock(&pers_lock
);
7313 EXPORT_SYMBOL(register_md_cluster_operations
);
7315 int unregister_md_cluster_operations(void)
7317 spin_lock(&pers_lock
);
7318 md_cluster_ops
= NULL
;
7319 spin_unlock(&pers_lock
);
7322 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7324 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7328 err
= request_module("md-cluster");
7330 pr_err("md-cluster module not found.\n");
7334 spin_lock(&pers_lock
);
7335 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7336 spin_unlock(&pers_lock
);
7339 spin_unlock(&pers_lock
);
7341 return md_cluster_ops
->join(mddev
, nodes
);
7344 void md_cluster_stop(struct mddev
*mddev
)
7346 if (!md_cluster_ops
)
7348 md_cluster_ops
->leave(mddev
);
7349 module_put(md_cluster_mod
);
7352 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7354 struct md_rdev
*rdev
;
7360 rdev_for_each_rcu(rdev
, mddev
) {
7361 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7362 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7363 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7364 atomic_read(&disk
->sync_io
);
7365 /* sync IO will cause sync_io to increase before the disk_stats
7366 * as sync_io is counted when a request starts, and
7367 * disk_stats is counted when it completes.
7368 * So resync activity will cause curr_events to be smaller than
7369 * when there was no such activity.
7370 * non-sync IO will cause disk_stat to increase without
7371 * increasing sync_io so curr_events will (eventually)
7372 * be larger than it was before. Once it becomes
7373 * substantially larger, the test below will cause
7374 * the array to appear non-idle, and resync will slow
7376 * If there is a lot of outstanding resync activity when
7377 * we set last_event to curr_events, then all that activity
7378 * completing might cause the array to appear non-idle
7379 * and resync will be slowed down even though there might
7380 * not have been non-resync activity. This will only
7381 * happen once though. 'last_events' will soon reflect
7382 * the state where there is little or no outstanding
7383 * resync requests, and further resync activity will
7384 * always make curr_events less than last_events.
7387 if (init
|| curr_events
- rdev
->last_events
> 64) {
7388 rdev
->last_events
= curr_events
;
7396 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7398 /* another "blocks" (512byte) blocks have been synced */
7399 atomic_sub(blocks
, &mddev
->recovery_active
);
7400 wake_up(&mddev
->recovery_wait
);
7402 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7403 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7404 md_wakeup_thread(mddev
->thread
);
7405 // stop recovery, signal do_sync ....
7408 EXPORT_SYMBOL(md_done_sync
);
7410 /* md_write_start(mddev, bi)
7411 * If we need to update some array metadata (e.g. 'active' flag
7412 * in superblock) before writing, schedule a superblock update
7413 * and wait for it to complete.
7415 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7418 if (bio_data_dir(bi
) != WRITE
)
7421 BUG_ON(mddev
->ro
== 1);
7422 if (mddev
->ro
== 2) {
7423 /* need to switch to read/write */
7425 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7426 md_wakeup_thread(mddev
->thread
);
7427 md_wakeup_thread(mddev
->sync_thread
);
7430 atomic_inc(&mddev
->writes_pending
);
7431 if (mddev
->safemode
== 1)
7432 mddev
->safemode
= 0;
7433 if (mddev
->in_sync
) {
7434 spin_lock(&mddev
->lock
);
7435 if (mddev
->in_sync
) {
7437 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7438 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7439 md_wakeup_thread(mddev
->thread
);
7442 spin_unlock(&mddev
->lock
);
7445 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7446 wait_event(mddev
->sb_wait
,
7447 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7449 EXPORT_SYMBOL(md_write_start
);
7451 void md_write_end(struct mddev
*mddev
)
7453 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7454 if (mddev
->safemode
== 2)
7455 md_wakeup_thread(mddev
->thread
);
7456 else if (mddev
->safemode_delay
)
7457 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7460 EXPORT_SYMBOL(md_write_end
);
7462 /* md_allow_write(mddev)
7463 * Calling this ensures that the array is marked 'active' so that writes
7464 * may proceed without blocking. It is important to call this before
7465 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7466 * Must be called with mddev_lock held.
7468 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7469 * is dropped, so return -EAGAIN after notifying userspace.
7471 int md_allow_write(struct mddev
*mddev
)
7477 if (!mddev
->pers
->sync_request
)
7480 spin_lock(&mddev
->lock
);
7481 if (mddev
->in_sync
) {
7483 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7484 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7485 if (mddev
->safemode_delay
&&
7486 mddev
->safemode
== 0)
7487 mddev
->safemode
= 1;
7488 spin_unlock(&mddev
->lock
);
7489 if (mddev_is_clustered(mddev
))
7490 md_cluster_ops
->metadata_update_start(mddev
);
7491 md_update_sb(mddev
, 0);
7492 if (mddev_is_clustered(mddev
))
7493 md_cluster_ops
->metadata_update_finish(mddev
);
7494 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7496 spin_unlock(&mddev
->lock
);
7498 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7503 EXPORT_SYMBOL_GPL(md_allow_write
);
7505 #define SYNC_MARKS 10
7506 #define SYNC_MARK_STEP (3*HZ)
7507 #define UPDATE_FREQUENCY (5*60*HZ)
7508 void md_do_sync(struct md_thread
*thread
)
7510 struct mddev
*mddev
= thread
->mddev
;
7511 struct mddev
*mddev2
;
7512 unsigned int currspeed
= 0,
7514 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7515 unsigned long mark
[SYNC_MARKS
];
7516 unsigned long update_time
;
7517 sector_t mark_cnt
[SYNC_MARKS
];
7519 struct list_head
*tmp
;
7520 sector_t last_check
;
7522 struct md_rdev
*rdev
;
7523 char *desc
, *action
= NULL
;
7524 struct blk_plug plug
;
7526 /* just incase thread restarts... */
7527 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7529 if (mddev
->ro
) {/* never try to sync a read-only array */
7530 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7534 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7535 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7536 desc
= "data-check";
7538 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7539 desc
= "requested-resync";
7543 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7548 mddev
->last_sync_action
= action
?: desc
;
7550 /* we overload curr_resync somewhat here.
7551 * 0 == not engaged in resync at all
7552 * 2 == checking that there is no conflict with another sync
7553 * 1 == like 2, but have yielded to allow conflicting resync to
7555 * other == active in resync - this many blocks
7557 * Before starting a resync we must have set curr_resync to
7558 * 2, and then checked that every "conflicting" array has curr_resync
7559 * less than ours. When we find one that is the same or higher
7560 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7561 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7562 * This will mean we have to start checking from the beginning again.
7567 mddev
->curr_resync
= 2;
7570 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7572 for_each_mddev(mddev2
, tmp
) {
7573 if (mddev2
== mddev
)
7575 if (!mddev
->parallel_resync
7576 && mddev2
->curr_resync
7577 && match_mddev_units(mddev
, mddev2
)) {
7579 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7580 /* arbitrarily yield */
7581 mddev
->curr_resync
= 1;
7582 wake_up(&resync_wait
);
7584 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7585 /* no need to wait here, we can wait the next
7586 * time 'round when curr_resync == 2
7589 /* We need to wait 'interruptible' so as not to
7590 * contribute to the load average, and not to
7591 * be caught by 'softlockup'
7593 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7594 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7595 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7596 printk(KERN_INFO
"md: delaying %s of %s"
7597 " until %s has finished (they"
7598 " share one or more physical units)\n",
7599 desc
, mdname(mddev
), mdname(mddev2
));
7601 if (signal_pending(current
))
7602 flush_signals(current
);
7604 finish_wait(&resync_wait
, &wq
);
7607 finish_wait(&resync_wait
, &wq
);
7610 } while (mddev
->curr_resync
< 2);
7613 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7614 /* resync follows the size requested by the personality,
7615 * which defaults to physical size, but can be virtual size
7617 max_sectors
= mddev
->resync_max_sectors
;
7618 atomic64_set(&mddev
->resync_mismatches
, 0);
7619 /* we don't use the checkpoint if there's a bitmap */
7620 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7621 j
= mddev
->resync_min
;
7622 else if (!mddev
->bitmap
)
7623 j
= mddev
->recovery_cp
;
7625 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7626 max_sectors
= mddev
->resync_max_sectors
;
7628 /* recovery follows the physical size of devices */
7629 max_sectors
= mddev
->dev_sectors
;
7632 rdev_for_each_rcu(rdev
, mddev
)
7633 if (rdev
->raid_disk
>= 0 &&
7634 !test_bit(Faulty
, &rdev
->flags
) &&
7635 !test_bit(In_sync
, &rdev
->flags
) &&
7636 rdev
->recovery_offset
< j
)
7637 j
= rdev
->recovery_offset
;
7640 /* If there is a bitmap, we need to make sure all
7641 * writes that started before we added a spare
7642 * complete before we start doing a recovery.
7643 * Otherwise the write might complete and (via
7644 * bitmap_endwrite) set a bit in the bitmap after the
7645 * recovery has checked that bit and skipped that
7648 if (mddev
->bitmap
) {
7649 mddev
->pers
->quiesce(mddev
, 1);
7650 mddev
->pers
->quiesce(mddev
, 0);
7654 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7655 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7656 " %d KB/sec/disk.\n", speed_min(mddev
));
7657 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7658 "(but not more than %d KB/sec) for %s.\n",
7659 speed_max(mddev
), desc
);
7661 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7664 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7666 mark_cnt
[m
] = io_sectors
;
7669 mddev
->resync_mark
= mark
[last_mark
];
7670 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7673 * Tune reconstruction:
7675 window
= 32*(PAGE_SIZE
/512);
7676 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7677 window
/2, (unsigned long long)max_sectors
/2);
7679 atomic_set(&mddev
->recovery_active
, 0);
7684 "md: resuming %s of %s from checkpoint.\n",
7685 desc
, mdname(mddev
));
7686 mddev
->curr_resync
= j
;
7688 mddev
->curr_resync
= 3; /* no longer delayed */
7689 mddev
->curr_resync_completed
= j
;
7690 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7691 md_new_event(mddev
);
7692 update_time
= jiffies
;
7694 if (mddev_is_clustered(mddev
))
7695 md_cluster_ops
->resync_start(mddev
, j
, max_sectors
);
7697 blk_start_plug(&plug
);
7698 while (j
< max_sectors
) {
7703 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7704 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7705 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7706 > (max_sectors
>> 4)) ||
7707 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7708 (j
- mddev
->curr_resync_completed
)*2
7709 >= mddev
->resync_max
- mddev
->curr_resync_completed
7711 /* time to update curr_resync_completed */
7712 wait_event(mddev
->recovery_wait
,
7713 atomic_read(&mddev
->recovery_active
) == 0);
7714 mddev
->curr_resync_completed
= j
;
7715 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7716 j
> mddev
->recovery_cp
)
7717 mddev
->recovery_cp
= j
;
7718 update_time
= jiffies
;
7719 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7720 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7723 while (j
>= mddev
->resync_max
&&
7724 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7725 /* As this condition is controlled by user-space,
7726 * we can block indefinitely, so use '_interruptible'
7727 * to avoid triggering warnings.
7729 flush_signals(current
); /* just in case */
7730 wait_event_interruptible(mddev
->recovery_wait
,
7731 mddev
->resync_max
> j
7732 || test_bit(MD_RECOVERY_INTR
,
7736 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7739 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7740 currspeed
< speed_min(mddev
));
7742 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7746 if (!skipped
) { /* actual IO requested */
7747 io_sectors
+= sectors
;
7748 atomic_add(sectors
, &mddev
->recovery_active
);
7751 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7756 mddev
->curr_resync
= j
;
7757 if (mddev_is_clustered(mddev
))
7758 md_cluster_ops
->resync_info_update(mddev
, j
, max_sectors
);
7759 mddev
->curr_mark_cnt
= io_sectors
;
7760 if (last_check
== 0)
7761 /* this is the earliest that rebuild will be
7762 * visible in /proc/mdstat
7764 md_new_event(mddev
);
7766 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7769 last_check
= io_sectors
;
7771 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7773 int next
= (last_mark
+1) % SYNC_MARKS
;
7775 mddev
->resync_mark
= mark
[next
];
7776 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7777 mark
[next
] = jiffies
;
7778 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7782 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7786 * this loop exits only if either when we are slower than
7787 * the 'hard' speed limit, or the system was IO-idle for
7789 * the system might be non-idle CPU-wise, but we only care
7790 * about not overloading the IO subsystem. (things like an
7791 * e2fsck being done on the RAID array should execute fast)
7795 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7796 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7797 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7799 if (currspeed
> speed_min(mddev
)) {
7800 if ((currspeed
> speed_max(mddev
)) ||
7801 !is_mddev_idle(mddev
, 0)) {
7807 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7808 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7809 ? "interrupted" : "done");
7811 * this also signals 'finished resyncing' to md_stop
7813 blk_finish_plug(&plug
);
7814 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7816 /* tell personality that we are finished */
7817 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7819 if (mddev_is_clustered(mddev
))
7820 md_cluster_ops
->resync_finish(mddev
);
7822 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7823 mddev
->curr_resync
> 2) {
7824 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7825 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7826 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7828 "md: checkpointing %s of %s.\n",
7829 desc
, mdname(mddev
));
7830 if (test_bit(MD_RECOVERY_ERROR
,
7832 mddev
->recovery_cp
=
7833 mddev
->curr_resync_completed
;
7835 mddev
->recovery_cp
=
7839 mddev
->recovery_cp
= MaxSector
;
7841 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7842 mddev
->curr_resync
= MaxSector
;
7844 rdev_for_each_rcu(rdev
, mddev
)
7845 if (rdev
->raid_disk
>= 0 &&
7846 mddev
->delta_disks
>= 0 &&
7847 !test_bit(Faulty
, &rdev
->flags
) &&
7848 !test_bit(In_sync
, &rdev
->flags
) &&
7849 rdev
->recovery_offset
< mddev
->curr_resync
)
7850 rdev
->recovery_offset
= mddev
->curr_resync
;
7855 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7857 spin_lock(&mddev
->lock
);
7858 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7859 /* We completed so min/max setting can be forgotten if used. */
7860 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7861 mddev
->resync_min
= 0;
7862 mddev
->resync_max
= MaxSector
;
7863 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7864 mddev
->resync_min
= mddev
->curr_resync_completed
;
7865 mddev
->curr_resync
= 0;
7866 spin_unlock(&mddev
->lock
);
7868 wake_up(&resync_wait
);
7869 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7870 md_wakeup_thread(mddev
->thread
);
7873 EXPORT_SYMBOL_GPL(md_do_sync
);
7875 static int remove_and_add_spares(struct mddev
*mddev
,
7876 struct md_rdev
*this)
7878 struct md_rdev
*rdev
;
7882 rdev_for_each(rdev
, mddev
)
7883 if ((this == NULL
|| rdev
== this) &&
7884 rdev
->raid_disk
>= 0 &&
7885 !test_bit(Blocked
, &rdev
->flags
) &&
7886 (test_bit(Faulty
, &rdev
->flags
) ||
7887 ! test_bit(In_sync
, &rdev
->flags
)) &&
7888 atomic_read(&rdev
->nr_pending
)==0) {
7889 if (mddev
->pers
->hot_remove_disk(
7890 mddev
, rdev
) == 0) {
7891 sysfs_unlink_rdev(mddev
, rdev
);
7892 rdev
->raid_disk
= -1;
7896 if (removed
&& mddev
->kobj
.sd
)
7897 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7902 rdev_for_each(rdev
, mddev
) {
7903 if (rdev
->raid_disk
>= 0 &&
7904 !test_bit(In_sync
, &rdev
->flags
) &&
7905 !test_bit(Faulty
, &rdev
->flags
))
7907 if (rdev
->raid_disk
>= 0)
7909 if (test_bit(Faulty
, &rdev
->flags
))
7912 ! (rdev
->saved_raid_disk
>= 0 &&
7913 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7916 if (rdev
->saved_raid_disk
< 0)
7917 rdev
->recovery_offset
= 0;
7919 hot_add_disk(mddev
, rdev
) == 0) {
7920 if (sysfs_link_rdev(mddev
, rdev
))
7921 /* failure here is OK */;
7923 md_new_event(mddev
);
7924 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7929 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7933 static void md_start_sync(struct work_struct
*ws
)
7935 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7937 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7940 if (!mddev
->sync_thread
) {
7941 printk(KERN_ERR
"%s: could not start resync"
7944 /* leave the spares where they are, it shouldn't hurt */
7945 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7946 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7947 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7948 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7949 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7950 wake_up(&resync_wait
);
7951 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7953 if (mddev
->sysfs_action
)
7954 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7956 md_wakeup_thread(mddev
->sync_thread
);
7957 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7958 md_new_event(mddev
);
7962 * This routine is regularly called by all per-raid-array threads to
7963 * deal with generic issues like resync and super-block update.
7964 * Raid personalities that don't have a thread (linear/raid0) do not
7965 * need this as they never do any recovery or update the superblock.
7967 * It does not do any resync itself, but rather "forks" off other threads
7968 * to do that as needed.
7969 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7970 * "->recovery" and create a thread at ->sync_thread.
7971 * When the thread finishes it sets MD_RECOVERY_DONE
7972 * and wakeups up this thread which will reap the thread and finish up.
7973 * This thread also removes any faulty devices (with nr_pending == 0).
7975 * The overall approach is:
7976 * 1/ if the superblock needs updating, update it.
7977 * 2/ If a recovery thread is running, don't do anything else.
7978 * 3/ If recovery has finished, clean up, possibly marking spares active.
7979 * 4/ If there are any faulty devices, remove them.
7980 * 5/ If array is degraded, try to add spares devices
7981 * 6/ If array has spares or is not in-sync, start a resync thread.
7983 void md_check_recovery(struct mddev
*mddev
)
7985 if (mddev
->suspended
)
7989 bitmap_daemon_work(mddev
);
7991 if (signal_pending(current
)) {
7992 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7993 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7995 mddev
->safemode
= 2;
7997 flush_signals(current
);
8000 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8003 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8004 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8005 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8006 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8007 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8008 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8012 if (mddev_trylock(mddev
)) {
8016 /* On a read-only array we can:
8017 * - remove failed devices
8018 * - add already-in_sync devices if the array itself
8020 * As we only add devices that are already in-sync,
8021 * we can activate the spares immediately.
8023 remove_and_add_spares(mddev
, NULL
);
8024 /* There is no thread, but we need to call
8025 * ->spare_active and clear saved_raid_disk
8027 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8028 md_reap_sync_thread(mddev
);
8029 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8033 if (!mddev
->external
) {
8035 spin_lock(&mddev
->lock
);
8036 if (mddev
->safemode
&&
8037 !atomic_read(&mddev
->writes_pending
) &&
8039 mddev
->recovery_cp
== MaxSector
) {
8042 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8044 if (mddev
->safemode
== 1)
8045 mddev
->safemode
= 0;
8046 spin_unlock(&mddev
->lock
);
8048 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8051 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
) {
8052 if (mddev_is_clustered(mddev
))
8053 md_cluster_ops
->metadata_update_start(mddev
);
8054 md_update_sb(mddev
, 0);
8055 if (mddev_is_clustered(mddev
))
8056 md_cluster_ops
->metadata_update_finish(mddev
);
8059 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8060 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8061 /* resync/recovery still happening */
8062 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8065 if (mddev
->sync_thread
) {
8066 md_reap_sync_thread(mddev
);
8069 /* Set RUNNING before clearing NEEDED to avoid
8070 * any transients in the value of "sync_action".
8072 mddev
->curr_resync_completed
= 0;
8073 spin_lock(&mddev
->lock
);
8074 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8075 spin_unlock(&mddev
->lock
);
8076 /* Clear some bits that don't mean anything, but
8079 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8080 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8082 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8083 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8085 /* no recovery is running.
8086 * remove any failed drives, then
8087 * add spares if possible.
8088 * Spares are also removed and re-added, to allow
8089 * the personality to fail the re-add.
8092 if (mddev
->reshape_position
!= MaxSector
) {
8093 if (mddev
->pers
->check_reshape
== NULL
||
8094 mddev
->pers
->check_reshape(mddev
) != 0)
8095 /* Cannot proceed */
8097 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8098 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8099 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8100 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8101 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8102 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8103 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8104 } else if (mddev
->recovery_cp
< MaxSector
) {
8105 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8106 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8107 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8108 /* nothing to be done ... */
8111 if (mddev
->pers
->sync_request
) {
8113 /* We are adding a device or devices to an array
8114 * which has the bitmap stored on all devices.
8115 * So make sure all bitmap pages get written
8117 bitmap_write_all(mddev
->bitmap
);
8119 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8120 queue_work(md_misc_wq
, &mddev
->del_work
);
8124 if (!mddev
->sync_thread
) {
8125 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8126 wake_up(&resync_wait
);
8127 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8129 if (mddev
->sysfs_action
)
8130 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8133 wake_up(&mddev
->sb_wait
);
8134 mddev_unlock(mddev
);
8137 EXPORT_SYMBOL(md_check_recovery
);
8139 void md_reap_sync_thread(struct mddev
*mddev
)
8141 struct md_rdev
*rdev
;
8143 /* resync has finished, collect result */
8144 md_unregister_thread(&mddev
->sync_thread
);
8145 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8146 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8148 /* activate any spares */
8149 if (mddev
->pers
->spare_active(mddev
)) {
8150 sysfs_notify(&mddev
->kobj
, NULL
,
8152 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8155 if (mddev_is_clustered(mddev
))
8156 md_cluster_ops
->metadata_update_start(mddev
);
8157 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8158 mddev
->pers
->finish_reshape
)
8159 mddev
->pers
->finish_reshape(mddev
);
8161 /* If array is no-longer degraded, then any saved_raid_disk
8162 * information must be scrapped.
8164 if (!mddev
->degraded
)
8165 rdev_for_each(rdev
, mddev
)
8166 rdev
->saved_raid_disk
= -1;
8168 md_update_sb(mddev
, 1);
8169 if (mddev_is_clustered(mddev
))
8170 md_cluster_ops
->metadata_update_finish(mddev
);
8171 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8172 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8173 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8174 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8175 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8176 wake_up(&resync_wait
);
8177 /* flag recovery needed just to double check */
8178 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8179 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8180 md_new_event(mddev
);
8181 if (mddev
->event_work
.func
)
8182 queue_work(md_misc_wq
, &mddev
->event_work
);
8184 EXPORT_SYMBOL(md_reap_sync_thread
);
8186 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8188 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8189 wait_event_timeout(rdev
->blocked_wait
,
8190 !test_bit(Blocked
, &rdev
->flags
) &&
8191 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8192 msecs_to_jiffies(5000));
8193 rdev_dec_pending(rdev
, mddev
);
8195 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8197 void md_finish_reshape(struct mddev
*mddev
)
8199 /* called be personality module when reshape completes. */
8200 struct md_rdev
*rdev
;
8202 rdev_for_each(rdev
, mddev
) {
8203 if (rdev
->data_offset
> rdev
->new_data_offset
)
8204 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8206 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8207 rdev
->data_offset
= rdev
->new_data_offset
;
8210 EXPORT_SYMBOL(md_finish_reshape
);
8212 /* Bad block management.
8213 * We can record which blocks on each device are 'bad' and so just
8214 * fail those blocks, or that stripe, rather than the whole device.
8215 * Entries in the bad-block table are 64bits wide. This comprises:
8216 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8217 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8218 * A 'shift' can be set so that larger blocks are tracked and
8219 * consequently larger devices can be covered.
8220 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8222 * Locking of the bad-block table uses a seqlock so md_is_badblock
8223 * might need to retry if it is very unlucky.
8224 * We will sometimes want to check for bad blocks in a bi_end_io function,
8225 * so we use the write_seqlock_irq variant.
8227 * When looking for a bad block we specify a range and want to
8228 * know if any block in the range is bad. So we binary-search
8229 * to the last range that starts at-or-before the given endpoint,
8230 * (or "before the sector after the target range")
8231 * then see if it ends after the given start.
8233 * 0 if there are no known bad blocks in the range
8234 * 1 if there are known bad block which are all acknowledged
8235 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8236 * plus the start/length of the first bad section we overlap.
8238 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8239 sector_t
*first_bad
, int *bad_sectors
)
8245 sector_t target
= s
+ sectors
;
8248 if (bb
->shift
> 0) {
8249 /* round the start down, and the end up */
8251 target
+= (1<<bb
->shift
) - 1;
8252 target
>>= bb
->shift
;
8253 sectors
= target
- s
;
8255 /* 'target' is now the first block after the bad range */
8258 seq
= read_seqbegin(&bb
->lock
);
8263 /* Binary search between lo and hi for 'target'
8264 * i.e. for the last range that starts before 'target'
8266 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8267 * are known not to be the last range before target.
8268 * VARIANT: hi-lo is the number of possible
8269 * ranges, and decreases until it reaches 1
8271 while (hi
- lo
> 1) {
8272 int mid
= (lo
+ hi
) / 2;
8273 sector_t a
= BB_OFFSET(p
[mid
]);
8275 /* This could still be the one, earlier ranges
8279 /* This and later ranges are definitely out. */
8282 /* 'lo' might be the last that started before target, but 'hi' isn't */
8284 /* need to check all range that end after 's' to see if
8285 * any are unacknowledged.
8288 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8289 if (BB_OFFSET(p
[lo
]) < target
) {
8290 /* starts before the end, and finishes after
8291 * the start, so they must overlap
8293 if (rv
!= -1 && BB_ACK(p
[lo
]))
8297 *first_bad
= BB_OFFSET(p
[lo
]);
8298 *bad_sectors
= BB_LEN(p
[lo
]);
8304 if (read_seqretry(&bb
->lock
, seq
))
8309 EXPORT_SYMBOL_GPL(md_is_badblock
);
8312 * Add a range of bad blocks to the table.
8313 * This might extend the table, or might contract it
8314 * if two adjacent ranges can be merged.
8315 * We binary-search to find the 'insertion' point, then
8316 * decide how best to handle it.
8318 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8324 unsigned long flags
;
8327 /* badblocks are disabled */
8331 /* round the start down, and the end up */
8332 sector_t next
= s
+ sectors
;
8334 next
+= (1<<bb
->shift
) - 1;
8339 write_seqlock_irqsave(&bb
->lock
, flags
);
8344 /* Find the last range that starts at-or-before 's' */
8345 while (hi
- lo
> 1) {
8346 int mid
= (lo
+ hi
) / 2;
8347 sector_t a
= BB_OFFSET(p
[mid
]);
8353 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8357 /* we found a range that might merge with the start
8360 sector_t a
= BB_OFFSET(p
[lo
]);
8361 sector_t e
= a
+ BB_LEN(p
[lo
]);
8362 int ack
= BB_ACK(p
[lo
]);
8364 /* Yes, we can merge with a previous range */
8365 if (s
== a
&& s
+ sectors
>= e
)
8366 /* new range covers old */
8369 ack
= ack
&& acknowledged
;
8371 if (e
< s
+ sectors
)
8373 if (e
- a
<= BB_MAX_LEN
) {
8374 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8377 /* does not all fit in one range,
8378 * make p[lo] maximal
8380 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8381 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8387 if (sectors
&& hi
< bb
->count
) {
8388 /* 'hi' points to the first range that starts after 's'.
8389 * Maybe we can merge with the start of that range */
8390 sector_t a
= BB_OFFSET(p
[hi
]);
8391 sector_t e
= a
+ BB_LEN(p
[hi
]);
8392 int ack
= BB_ACK(p
[hi
]);
8393 if (a
<= s
+ sectors
) {
8394 /* merging is possible */
8395 if (e
<= s
+ sectors
) {
8400 ack
= ack
&& acknowledged
;
8403 if (e
- a
<= BB_MAX_LEN
) {
8404 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8407 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8415 if (sectors
== 0 && hi
< bb
->count
) {
8416 /* we might be able to combine lo and hi */
8417 /* Note: 's' is at the end of 'lo' */
8418 sector_t a
= BB_OFFSET(p
[hi
]);
8419 int lolen
= BB_LEN(p
[lo
]);
8420 int hilen
= BB_LEN(p
[hi
]);
8421 int newlen
= lolen
+ hilen
- (s
- a
);
8422 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8423 /* yes, we can combine them */
8424 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8425 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8426 memmove(p
+ hi
, p
+ hi
+ 1,
8427 (bb
->count
- hi
- 1) * 8);
8432 /* didn't merge (it all).
8433 * Need to add a range just before 'hi' */
8434 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8435 /* No room for more */
8439 int this_sectors
= sectors
;
8440 memmove(p
+ hi
+ 1, p
+ hi
,
8441 (bb
->count
- hi
) * 8);
8444 if (this_sectors
> BB_MAX_LEN
)
8445 this_sectors
= BB_MAX_LEN
;
8446 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8447 sectors
-= this_sectors
;
8454 bb
->unacked_exist
= 1;
8455 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8460 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8465 s
+= rdev
->new_data_offset
;
8467 s
+= rdev
->data_offset
;
8468 rv
= md_set_badblocks(&rdev
->badblocks
,
8471 /* Make sure they get written out promptly */
8472 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8473 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8474 md_wakeup_thread(rdev
->mddev
->thread
);
8478 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8481 * Remove a range of bad blocks from the table.
8482 * This may involve extending the table if we spilt a region,
8483 * but it must not fail. So if the table becomes full, we just
8484 * drop the remove request.
8486 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8490 sector_t target
= s
+ sectors
;
8493 if (bb
->shift
> 0) {
8494 /* When clearing we round the start up and the end down.
8495 * This should not matter as the shift should align with
8496 * the block size and no rounding should ever be needed.
8497 * However it is better the think a block is bad when it
8498 * isn't than to think a block is not bad when it is.
8500 s
+= (1<<bb
->shift
) - 1;
8502 target
>>= bb
->shift
;
8503 sectors
= target
- s
;
8506 write_seqlock_irq(&bb
->lock
);
8511 /* Find the last range that starts before 'target' */
8512 while (hi
- lo
> 1) {
8513 int mid
= (lo
+ hi
) / 2;
8514 sector_t a
= BB_OFFSET(p
[mid
]);
8521 /* p[lo] is the last range that could overlap the
8522 * current range. Earlier ranges could also overlap,
8523 * but only this one can overlap the end of the range.
8525 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8526 /* Partial overlap, leave the tail of this range */
8527 int ack
= BB_ACK(p
[lo
]);
8528 sector_t a
= BB_OFFSET(p
[lo
]);
8529 sector_t end
= a
+ BB_LEN(p
[lo
]);
8532 /* we need to split this range */
8533 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8537 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8539 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8542 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8543 /* there is no longer an overlap */
8548 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8549 /* This range does overlap */
8550 if (BB_OFFSET(p
[lo
]) < s
) {
8551 /* Keep the early parts of this range. */
8552 int ack
= BB_ACK(p
[lo
]);
8553 sector_t start
= BB_OFFSET(p
[lo
]);
8554 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8555 /* now low doesn't overlap, so.. */
8560 /* 'lo' is strictly before, 'hi' is strictly after,
8561 * anything between needs to be discarded
8564 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8565 bb
->count
-= (hi
- lo
- 1);
8571 write_sequnlock_irq(&bb
->lock
);
8575 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8579 s
+= rdev
->new_data_offset
;
8581 s
+= rdev
->data_offset
;
8582 return md_clear_badblocks(&rdev
->badblocks
,
8585 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8588 * Acknowledge all bad blocks in a list.
8589 * This only succeeds if ->changed is clear. It is used by
8590 * in-kernel metadata updates
8592 void md_ack_all_badblocks(struct badblocks
*bb
)
8594 if (bb
->page
== NULL
|| bb
->changed
)
8595 /* no point even trying */
8597 write_seqlock_irq(&bb
->lock
);
8599 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8602 for (i
= 0; i
< bb
->count
; i
++) {
8603 if (!BB_ACK(p
[i
])) {
8604 sector_t start
= BB_OFFSET(p
[i
]);
8605 int len
= BB_LEN(p
[i
]);
8606 p
[i
] = BB_MAKE(start
, len
, 1);
8609 bb
->unacked_exist
= 0;
8611 write_sequnlock_irq(&bb
->lock
);
8613 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8615 /* sysfs access to bad-blocks list.
8616 * We present two files.
8617 * 'bad-blocks' lists sector numbers and lengths of ranges that
8618 * are recorded as bad. The list is truncated to fit within
8619 * the one-page limit of sysfs.
8620 * Writing "sector length" to this file adds an acknowledged
8622 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8623 * been acknowledged. Writing to this file adds bad blocks
8624 * without acknowledging them. This is largely for testing.
8628 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8639 seq
= read_seqbegin(&bb
->lock
);
8644 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8645 sector_t s
= BB_OFFSET(p
[i
]);
8646 unsigned int length
= BB_LEN(p
[i
]);
8647 int ack
= BB_ACK(p
[i
]);
8653 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8654 (unsigned long long)s
<< bb
->shift
,
8655 length
<< bb
->shift
);
8657 if (unack
&& len
== 0)
8658 bb
->unacked_exist
= 0;
8660 if (read_seqretry(&bb
->lock
, seq
))
8669 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8671 unsigned long long sector
;
8675 /* Allow clearing via sysfs *only* for testing/debugging.
8676 * Normally only a successful write may clear a badblock
8679 if (page
[0] == '-') {
8683 #endif /* DO_DEBUG */
8685 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8687 if (newline
!= '\n')
8699 md_clear_badblocks(bb
, sector
, length
);
8702 #endif /* DO_DEBUG */
8703 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8709 static int md_notify_reboot(struct notifier_block
*this,
8710 unsigned long code
, void *x
)
8712 struct list_head
*tmp
;
8713 struct mddev
*mddev
;
8716 for_each_mddev(mddev
, tmp
) {
8717 if (mddev_trylock(mddev
)) {
8719 __md_stop_writes(mddev
);
8720 if (mddev
->persistent
)
8721 mddev
->safemode
= 2;
8722 mddev_unlock(mddev
);
8727 * certain more exotic SCSI devices are known to be
8728 * volatile wrt too early system reboots. While the
8729 * right place to handle this issue is the given
8730 * driver, we do want to have a safe RAID driver ...
8738 static struct notifier_block md_notifier
= {
8739 .notifier_call
= md_notify_reboot
,
8741 .priority
= INT_MAX
, /* before any real devices */
8744 static void md_geninit(void)
8746 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8748 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8751 static int __init
md_init(void)
8755 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8759 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8763 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8766 if ((ret
= register_blkdev(0, "mdp")) < 0)
8770 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8771 md_probe
, NULL
, NULL
);
8772 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8773 md_probe
, NULL
, NULL
);
8775 register_reboot_notifier(&md_notifier
);
8776 raid_table_header
= register_sysctl_table(raid_root_table
);
8782 unregister_blkdev(MD_MAJOR
, "md");
8784 destroy_workqueue(md_misc_wq
);
8786 destroy_workqueue(md_wq
);
8791 void md_reload_sb(struct mddev
*mddev
)
8793 struct md_rdev
*rdev
, *tmp
;
8795 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8796 rdev
->sb_loaded
= 0;
8797 ClearPageUptodate(rdev
->sb_page
);
8799 mddev
->raid_disks
= 0;
8801 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8802 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8803 /* since we don't write to faulty devices, we figure out if the
8804 * disk is faulty by comparing events
8806 if (mddev
->events
> sb
->events
)
8807 set_bit(Faulty
, &rdev
->flags
);
8811 EXPORT_SYMBOL(md_reload_sb
);
8816 * Searches all registered partitions for autorun RAID arrays
8820 static LIST_HEAD(all_detected_devices
);
8821 struct detected_devices_node
{
8822 struct list_head list
;
8826 void md_autodetect_dev(dev_t dev
)
8828 struct detected_devices_node
*node_detected_dev
;
8830 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8831 if (node_detected_dev
) {
8832 node_detected_dev
->dev
= dev
;
8833 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8835 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8836 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8840 static void autostart_arrays(int part
)
8842 struct md_rdev
*rdev
;
8843 struct detected_devices_node
*node_detected_dev
;
8845 int i_scanned
, i_passed
;
8850 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8852 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8854 node_detected_dev
= list_entry(all_detected_devices
.next
,
8855 struct detected_devices_node
, list
);
8856 list_del(&node_detected_dev
->list
);
8857 dev
= node_detected_dev
->dev
;
8858 kfree(node_detected_dev
);
8859 rdev
= md_import_device(dev
,0, 90);
8863 if (test_bit(Faulty
, &rdev
->flags
))
8866 set_bit(AutoDetected
, &rdev
->flags
);
8867 list_add(&rdev
->same_set
, &pending_raid_disks
);
8871 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8872 i_scanned
, i_passed
);
8874 autorun_devices(part
);
8877 #endif /* !MODULE */
8879 static __exit
void md_exit(void)
8881 struct mddev
*mddev
;
8882 struct list_head
*tmp
;
8885 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8886 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8888 unregister_blkdev(MD_MAJOR
,"md");
8889 unregister_blkdev(mdp_major
, "mdp");
8890 unregister_reboot_notifier(&md_notifier
);
8891 unregister_sysctl_table(raid_table_header
);
8893 /* We cannot unload the modules while some process is
8894 * waiting for us in select() or poll() - wake them up
8897 while (waitqueue_active(&md_event_waiters
)) {
8898 /* not safe to leave yet */
8899 wake_up(&md_event_waiters
);
8903 remove_proc_entry("mdstat", NULL
);
8905 for_each_mddev(mddev
, tmp
) {
8906 export_array(mddev
);
8907 mddev
->hold_active
= 0;
8909 destroy_workqueue(md_misc_wq
);
8910 destroy_workqueue(md_wq
);
8913 subsys_initcall(md_init
);
8914 module_exit(md_exit
)
8916 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8918 return sprintf(buffer
, "%d", start_readonly
);
8920 static int set_ro(const char *val
, struct kernel_param
*kp
)
8923 int num
= simple_strtoul(val
, &e
, 10);
8924 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8925 start_readonly
= num
;
8931 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8932 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8933 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8935 MODULE_LICENSE("GPL");
8936 MODULE_DESCRIPTION("MD RAID framework");
8938 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);