2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 static void autostart_arrays(int part
);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list
);
67 static DEFINE_SPINLOCK(pers_lock
);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
70 static struct workqueue_struct
*md_wq
;
71 static struct workqueue_struct
*md_misc_wq
;
73 static int remove_and_add_spares(struct mddev
*mddev
,
74 struct md_rdev
*this);
75 static void mddev_detach(struct mddev
*mddev
);
78 * Default number of read corrections we'll attempt on an rdev
79 * before ejecting it from the array. We divide the read error
80 * count by 2 for every hour elapsed between read errors.
82 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
84 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
85 * is 1000 KB/sec, so the extra system load does not show up that much.
86 * Increase it if you want to have more _guaranteed_ speed. Note that
87 * the RAID driver will use the maximum available bandwidth if the IO
88 * subsystem is idle. There is also an 'absolute maximum' reconstruction
89 * speed limit - in case reconstruction slows down your system despite
92 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
93 * or /sys/block/mdX/md/sync_speed_{min,max}
96 static int sysctl_speed_limit_min
= 1000;
97 static int sysctl_speed_limit_max
= 200000;
98 static inline int speed_min(struct mddev
*mddev
)
100 return mddev
->sync_speed_min
?
101 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
104 static inline int speed_max(struct mddev
*mddev
)
106 return mddev
->sync_speed_max
?
107 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
110 static struct ctl_table_header
*raid_table_header
;
112 static struct ctl_table raid_table
[] = {
114 .procname
= "speed_limit_min",
115 .data
= &sysctl_speed_limit_min
,
116 .maxlen
= sizeof(int),
117 .mode
= S_IRUGO
|S_IWUSR
,
118 .proc_handler
= proc_dointvec
,
121 .procname
= "speed_limit_max",
122 .data
= &sysctl_speed_limit_max
,
123 .maxlen
= sizeof(int),
124 .mode
= S_IRUGO
|S_IWUSR
,
125 .proc_handler
= proc_dointvec
,
130 static struct ctl_table raid_dir_table
[] = {
134 .mode
= S_IRUGO
|S_IXUGO
,
140 static struct ctl_table raid_root_table
[] = {
145 .child
= raid_dir_table
,
150 static const struct block_device_operations md_fops
;
152 static int start_readonly
;
155 * like bio_clone, but with a local bio set
158 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
163 if (!mddev
|| !mddev
->bio_set
)
164 return bio_alloc(gfp_mask
, nr_iovecs
);
166 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
171 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
173 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
176 if (!mddev
|| !mddev
->bio_set
)
177 return bio_clone(bio
, gfp_mask
);
179 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
181 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
184 * We have a system wide 'event count' that is incremented
185 * on any 'interesting' event, and readers of /proc/mdstat
186 * can use 'poll' or 'select' to find out when the event
190 * start array, stop array, error, add device, remove device,
191 * start build, activate spare
193 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
194 static atomic_t md_event_count
;
195 void md_new_event(struct mddev
*mddev
)
197 atomic_inc(&md_event_count
);
198 wake_up(&md_event_waiters
);
200 EXPORT_SYMBOL_GPL(md_new_event
);
202 /* Alternate version that can be called from interrupts
203 * when calling sysfs_notify isn't needed.
205 static void md_new_event_inintr(struct mddev
*mddev
)
207 atomic_inc(&md_event_count
);
208 wake_up(&md_event_waiters
);
212 * Enables to iterate over all existing md arrays
213 * all_mddevs_lock protects this list.
215 static LIST_HEAD(all_mddevs
);
216 static DEFINE_SPINLOCK(all_mddevs_lock
);
219 * iterates through all used mddevs in the system.
220 * We take care to grab the all_mddevs_lock whenever navigating
221 * the list, and to always hold a refcount when unlocked.
222 * Any code which breaks out of this loop while own
223 * a reference to the current mddev and must mddev_put it.
225 #define for_each_mddev(_mddev,_tmp) \
227 for (({ spin_lock(&all_mddevs_lock); \
228 _tmp = all_mddevs.next; \
230 ({ if (_tmp != &all_mddevs) \
231 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
232 spin_unlock(&all_mddevs_lock); \
233 if (_mddev) mddev_put(_mddev); \
234 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
235 _tmp != &all_mddevs;}); \
236 ({ spin_lock(&all_mddevs_lock); \
237 _tmp = _tmp->next;}) \
240 /* Rather than calling directly into the personality make_request function,
241 * IO requests come here first so that we can check if the device is
242 * being suspended pending a reconfiguration.
243 * We hold a refcount over the call to ->make_request. By the time that
244 * call has finished, the bio has been linked into some internal structure
245 * and so is visible to ->quiesce(), so we don't need the refcount any more.
247 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
249 const int rw
= bio_data_dir(bio
);
250 struct mddev
*mddev
= q
->queuedata
;
251 unsigned int sectors
;
253 if (mddev
== NULL
|| mddev
->pers
== NULL
258 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
259 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
262 smp_rmb(); /* Ensure implications of 'active' are visible */
264 if (mddev
->suspended
) {
267 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
268 TASK_UNINTERRUPTIBLE
);
269 if (!mddev
->suspended
)
275 finish_wait(&mddev
->sb_wait
, &__wait
);
277 atomic_inc(&mddev
->active_io
);
281 * save the sectors now since our bio can
282 * go away inside make_request
284 sectors
= bio_sectors(bio
);
285 mddev
->pers
->make_request(mddev
, bio
);
287 generic_start_io_acct(rw
, sectors
, &mddev
->gendisk
->part0
);
289 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
290 wake_up(&mddev
->sb_wait
);
293 /* mddev_suspend makes sure no new requests are submitted
294 * to the device, and that any requests that have been submitted
295 * are completely handled.
296 * Once mddev_detach() is called and completes, the module will be
299 void mddev_suspend(struct mddev
*mddev
)
301 BUG_ON(mddev
->suspended
);
302 mddev
->suspended
= 1;
304 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
305 mddev
->pers
->quiesce(mddev
, 1);
307 del_timer_sync(&mddev
->safemode_timer
);
309 EXPORT_SYMBOL_GPL(mddev_suspend
);
311 void mddev_resume(struct mddev
*mddev
)
313 mddev
->suspended
= 0;
314 wake_up(&mddev
->sb_wait
);
315 mddev
->pers
->quiesce(mddev
, 0);
317 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
318 md_wakeup_thread(mddev
->thread
);
319 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
321 EXPORT_SYMBOL_GPL(mddev_resume
);
323 int mddev_congested(struct mddev
*mddev
, int bits
)
325 struct md_personality
*pers
= mddev
->pers
;
329 if (mddev
->suspended
)
331 else if (pers
&& pers
->congested
)
332 ret
= pers
->congested(mddev
, bits
);
336 EXPORT_SYMBOL_GPL(mddev_congested
);
337 static int md_congested(void *data
, int bits
)
339 struct mddev
*mddev
= data
;
340 return mddev_congested(mddev
, bits
);
343 static int md_mergeable_bvec(struct request_queue
*q
,
344 struct bvec_merge_data
*bvm
,
345 struct bio_vec
*biovec
)
347 struct mddev
*mddev
= q
->queuedata
;
350 if (mddev
->suspended
) {
351 /* Must always allow one vec */
352 if (bvm
->bi_size
== 0)
353 ret
= biovec
->bv_len
;
357 struct md_personality
*pers
= mddev
->pers
;
358 if (pers
&& pers
->mergeable_bvec
)
359 ret
= pers
->mergeable_bvec(mddev
, bvm
, biovec
);
361 ret
= biovec
->bv_len
;
367 * Generic flush handling for md
370 static void md_end_flush(struct bio
*bio
, int err
)
372 struct md_rdev
*rdev
= bio
->bi_private
;
373 struct mddev
*mddev
= rdev
->mddev
;
375 rdev_dec_pending(rdev
, mddev
);
377 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
378 /* The pre-request flush has finished */
379 queue_work(md_wq
, &mddev
->flush_work
);
384 static void md_submit_flush_data(struct work_struct
*ws
);
386 static void submit_flushes(struct work_struct
*ws
)
388 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
389 struct md_rdev
*rdev
;
391 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
392 atomic_set(&mddev
->flush_pending
, 1);
394 rdev_for_each_rcu(rdev
, mddev
)
395 if (rdev
->raid_disk
>= 0 &&
396 !test_bit(Faulty
, &rdev
->flags
)) {
397 /* Take two references, one is dropped
398 * when request finishes, one after
399 * we reclaim rcu_read_lock
402 atomic_inc(&rdev
->nr_pending
);
403 atomic_inc(&rdev
->nr_pending
);
405 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
406 bi
->bi_end_io
= md_end_flush
;
407 bi
->bi_private
= rdev
;
408 bi
->bi_bdev
= rdev
->bdev
;
409 atomic_inc(&mddev
->flush_pending
);
410 submit_bio(WRITE_FLUSH
, bi
);
412 rdev_dec_pending(rdev
, mddev
);
415 if (atomic_dec_and_test(&mddev
->flush_pending
))
416 queue_work(md_wq
, &mddev
->flush_work
);
419 static void md_submit_flush_data(struct work_struct
*ws
)
421 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
422 struct bio
*bio
= mddev
->flush_bio
;
424 if (bio
->bi_iter
.bi_size
== 0)
425 /* an empty barrier - all done */
428 bio
->bi_rw
&= ~REQ_FLUSH
;
429 mddev
->pers
->make_request(mddev
, bio
);
432 mddev
->flush_bio
= NULL
;
433 wake_up(&mddev
->sb_wait
);
436 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
438 spin_lock_irq(&mddev
->lock
);
439 wait_event_lock_irq(mddev
->sb_wait
,
442 mddev
->flush_bio
= bio
;
443 spin_unlock_irq(&mddev
->lock
);
445 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
446 queue_work(md_wq
, &mddev
->flush_work
);
448 EXPORT_SYMBOL(md_flush_request
);
450 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
452 struct mddev
*mddev
= cb
->data
;
453 md_wakeup_thread(mddev
->thread
);
456 EXPORT_SYMBOL(md_unplug
);
458 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
460 atomic_inc(&mddev
->active
);
464 static void mddev_delayed_delete(struct work_struct
*ws
);
466 static void mddev_put(struct mddev
*mddev
)
468 struct bio_set
*bs
= NULL
;
470 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
472 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
473 mddev
->ctime
== 0 && !mddev
->hold_active
) {
474 /* Array is not configured at all, and not held active,
476 list_del_init(&mddev
->all_mddevs
);
478 mddev
->bio_set
= NULL
;
479 if (mddev
->gendisk
) {
480 /* We did a probe so need to clean up. Call
481 * queue_work inside the spinlock so that
482 * flush_workqueue() after mddev_find will
483 * succeed in waiting for the work to be done.
485 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
486 queue_work(md_misc_wq
, &mddev
->del_work
);
490 spin_unlock(&all_mddevs_lock
);
495 void mddev_init(struct mddev
*mddev
)
497 mutex_init(&mddev
->open_mutex
);
498 mutex_init(&mddev
->reconfig_mutex
);
499 mutex_init(&mddev
->bitmap_info
.mutex
);
500 INIT_LIST_HEAD(&mddev
->disks
);
501 INIT_LIST_HEAD(&mddev
->all_mddevs
);
502 init_timer(&mddev
->safemode_timer
);
503 atomic_set(&mddev
->active
, 1);
504 atomic_set(&mddev
->openers
, 0);
505 atomic_set(&mddev
->active_io
, 0);
506 spin_lock_init(&mddev
->lock
);
507 atomic_set(&mddev
->flush_pending
, 0);
508 init_waitqueue_head(&mddev
->sb_wait
);
509 init_waitqueue_head(&mddev
->recovery_wait
);
510 mddev
->reshape_position
= MaxSector
;
511 mddev
->reshape_backwards
= 0;
512 mddev
->last_sync_action
= "none";
513 mddev
->resync_min
= 0;
514 mddev
->resync_max
= MaxSector
;
515 mddev
->level
= LEVEL_NONE
;
517 EXPORT_SYMBOL_GPL(mddev_init
);
519 static struct mddev
*mddev_find(dev_t unit
)
521 struct mddev
*mddev
, *new = NULL
;
523 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
524 unit
&= ~((1<<MdpMinorShift
)-1);
527 spin_lock(&all_mddevs_lock
);
530 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
531 if (mddev
->unit
== unit
) {
533 spin_unlock(&all_mddevs_lock
);
539 list_add(&new->all_mddevs
, &all_mddevs
);
540 spin_unlock(&all_mddevs_lock
);
541 new->hold_active
= UNTIL_IOCTL
;
545 /* find an unused unit number */
546 static int next_minor
= 512;
547 int start
= next_minor
;
551 dev
= MKDEV(MD_MAJOR
, next_minor
);
553 if (next_minor
> MINORMASK
)
555 if (next_minor
== start
) {
556 /* Oh dear, all in use. */
557 spin_unlock(&all_mddevs_lock
);
563 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
564 if (mddev
->unit
== dev
) {
570 new->md_minor
= MINOR(dev
);
571 new->hold_active
= UNTIL_STOP
;
572 list_add(&new->all_mddevs
, &all_mddevs
);
573 spin_unlock(&all_mddevs_lock
);
576 spin_unlock(&all_mddevs_lock
);
578 new = kzalloc(sizeof(*new), GFP_KERNEL
);
583 if (MAJOR(unit
) == MD_MAJOR
)
584 new->md_minor
= MINOR(unit
);
586 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
593 static inline int __must_check
mddev_lock(struct mddev
*mddev
)
595 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
598 /* Sometimes we need to take the lock in a situation where
599 * failure due to interrupts is not acceptable.
601 static inline void mddev_lock_nointr(struct mddev
*mddev
)
603 mutex_lock(&mddev
->reconfig_mutex
);
606 static inline int mddev_is_locked(struct mddev
*mddev
)
608 return mutex_is_locked(&mddev
->reconfig_mutex
);
611 static inline int mddev_trylock(struct mddev
*mddev
)
613 return mutex_trylock(&mddev
->reconfig_mutex
);
616 static struct attribute_group md_redundancy_group
;
618 static void mddev_unlock(struct mddev
*mddev
)
620 if (mddev
->to_remove
) {
621 /* These cannot be removed under reconfig_mutex as
622 * an access to the files will try to take reconfig_mutex
623 * while holding the file unremovable, which leads to
625 * So hold set sysfs_active while the remove in happeing,
626 * and anything else which might set ->to_remove or my
627 * otherwise change the sysfs namespace will fail with
628 * -EBUSY if sysfs_active is still set.
629 * We set sysfs_active under reconfig_mutex and elsewhere
630 * test it under the same mutex to ensure its correct value
633 struct attribute_group
*to_remove
= mddev
->to_remove
;
634 mddev
->to_remove
= NULL
;
635 mddev
->sysfs_active
= 1;
636 mutex_unlock(&mddev
->reconfig_mutex
);
638 if (mddev
->kobj
.sd
) {
639 if (to_remove
!= &md_redundancy_group
)
640 sysfs_remove_group(&mddev
->kobj
, to_remove
);
641 if (mddev
->pers
== NULL
||
642 mddev
->pers
->sync_request
== NULL
) {
643 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
644 if (mddev
->sysfs_action
)
645 sysfs_put(mddev
->sysfs_action
);
646 mddev
->sysfs_action
= NULL
;
649 mddev
->sysfs_active
= 0;
651 mutex_unlock(&mddev
->reconfig_mutex
);
653 /* As we've dropped the mutex we need a spinlock to
654 * make sure the thread doesn't disappear
656 spin_lock(&pers_lock
);
657 md_wakeup_thread(mddev
->thread
);
658 spin_unlock(&pers_lock
);
661 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
663 struct md_rdev
*rdev
;
665 rdev_for_each_rcu(rdev
, mddev
)
666 if (rdev
->desc_nr
== nr
)
672 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
674 struct md_rdev
*rdev
;
676 rdev_for_each(rdev
, mddev
)
677 if (rdev
->bdev
->bd_dev
== dev
)
683 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
685 struct md_rdev
*rdev
;
687 rdev_for_each_rcu(rdev
, mddev
)
688 if (rdev
->bdev
->bd_dev
== dev
)
694 static struct md_personality
*find_pers(int level
, char *clevel
)
696 struct md_personality
*pers
;
697 list_for_each_entry(pers
, &pers_list
, list
) {
698 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
700 if (strcmp(pers
->name
, clevel
)==0)
706 /* return the offset of the super block in 512byte sectors */
707 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
709 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
710 return MD_NEW_SIZE_SECTORS(num_sectors
);
713 static int alloc_disk_sb(struct md_rdev
*rdev
)
715 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
716 if (!rdev
->sb_page
) {
717 printk(KERN_ALERT
"md: out of memory.\n");
724 void md_rdev_clear(struct md_rdev
*rdev
)
727 put_page(rdev
->sb_page
);
729 rdev
->sb_page
= NULL
;
734 put_page(rdev
->bb_page
);
735 rdev
->bb_page
= NULL
;
737 kfree(rdev
->badblocks
.page
);
738 rdev
->badblocks
.page
= NULL
;
740 EXPORT_SYMBOL_GPL(md_rdev_clear
);
742 static void super_written(struct bio
*bio
, int error
)
744 struct md_rdev
*rdev
= bio
->bi_private
;
745 struct mddev
*mddev
= rdev
->mddev
;
747 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
748 printk("md: super_written gets error=%d, uptodate=%d\n",
749 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
750 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
751 md_error(mddev
, rdev
);
754 if (atomic_dec_and_test(&mddev
->pending_writes
))
755 wake_up(&mddev
->sb_wait
);
759 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
760 sector_t sector
, int size
, struct page
*page
)
762 /* write first size bytes of page to sector of rdev
763 * Increment mddev->pending_writes before returning
764 * and decrement it on completion, waking up sb_wait
765 * if zero is reached.
766 * If an error occurred, call md_error
768 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
770 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
771 bio
->bi_iter
.bi_sector
= sector
;
772 bio_add_page(bio
, page
, size
, 0);
773 bio
->bi_private
= rdev
;
774 bio
->bi_end_io
= super_written
;
776 atomic_inc(&mddev
->pending_writes
);
777 submit_bio(WRITE_FLUSH_FUA
, bio
);
780 void md_super_wait(struct mddev
*mddev
)
782 /* wait for all superblock writes that were scheduled to complete */
783 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
786 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
787 struct page
*page
, int rw
, bool metadata_op
)
789 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
792 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
793 rdev
->meta_bdev
: rdev
->bdev
;
795 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
796 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
797 (rdev
->mddev
->reshape_backwards
==
798 (sector
>= rdev
->mddev
->reshape_position
)))
799 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
801 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
802 bio_add_page(bio
, page
, size
, 0);
803 submit_bio_wait(rw
, bio
);
805 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
809 EXPORT_SYMBOL_GPL(sync_page_io
);
811 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
813 char b
[BDEVNAME_SIZE
];
818 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
824 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
825 bdevname(rdev
->bdev
,b
));
829 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
831 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
832 sb1
->set_uuid1
== sb2
->set_uuid1
&&
833 sb1
->set_uuid2
== sb2
->set_uuid2
&&
834 sb1
->set_uuid3
== sb2
->set_uuid3
;
837 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
840 mdp_super_t
*tmp1
, *tmp2
;
842 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
843 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
845 if (!tmp1
|| !tmp2
) {
847 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
855 * nr_disks is not constant
860 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
867 static u32
md_csum_fold(u32 csum
)
869 csum
= (csum
& 0xffff) + (csum
>> 16);
870 return (csum
& 0xffff) + (csum
>> 16);
873 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
876 u32
*sb32
= (u32
*)sb
;
878 unsigned int disk_csum
, csum
;
880 disk_csum
= sb
->sb_csum
;
883 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
885 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
888 /* This used to use csum_partial, which was wrong for several
889 * reasons including that different results are returned on
890 * different architectures. It isn't critical that we get exactly
891 * the same return value as before (we always csum_fold before
892 * testing, and that removes any differences). However as we
893 * know that csum_partial always returned a 16bit value on
894 * alphas, do a fold to maximise conformity to previous behaviour.
896 sb
->sb_csum
= md_csum_fold(disk_csum
);
898 sb
->sb_csum
= disk_csum
;
904 * Handle superblock details.
905 * We want to be able to handle multiple superblock formats
906 * so we have a common interface to them all, and an array of
907 * different handlers.
908 * We rely on user-space to write the initial superblock, and support
909 * reading and updating of superblocks.
910 * Interface methods are:
911 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
912 * loads and validates a superblock on dev.
913 * if refdev != NULL, compare superblocks on both devices
915 * 0 - dev has a superblock that is compatible with refdev
916 * 1 - dev has a superblock that is compatible and newer than refdev
917 * so dev should be used as the refdev in future
918 * -EINVAL superblock incompatible or invalid
919 * -othererror e.g. -EIO
921 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
922 * Verify that dev is acceptable into mddev.
923 * The first time, mddev->raid_disks will be 0, and data from
924 * dev should be merged in. Subsequent calls check that dev
925 * is new enough. Return 0 or -EINVAL
927 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
928 * Update the superblock for rdev with data in mddev
929 * This does not write to disc.
935 struct module
*owner
;
936 int (*load_super
)(struct md_rdev
*rdev
,
937 struct md_rdev
*refdev
,
939 int (*validate_super
)(struct mddev
*mddev
,
940 struct md_rdev
*rdev
);
941 void (*sync_super
)(struct mddev
*mddev
,
942 struct md_rdev
*rdev
);
943 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
944 sector_t num_sectors
);
945 int (*allow_new_offset
)(struct md_rdev
*rdev
,
946 unsigned long long new_offset
);
950 * Check that the given mddev has no bitmap.
952 * This function is called from the run method of all personalities that do not
953 * support bitmaps. It prints an error message and returns non-zero if mddev
954 * has a bitmap. Otherwise, it returns 0.
957 int md_check_no_bitmap(struct mddev
*mddev
)
959 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
961 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
962 mdname(mddev
), mddev
->pers
->name
);
965 EXPORT_SYMBOL(md_check_no_bitmap
);
968 * load_super for 0.90.0
970 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
972 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
977 * Calculate the position of the superblock (512byte sectors),
978 * it's at the end of the disk.
980 * It also happens to be a multiple of 4Kb.
982 rdev
->sb_start
= calc_dev_sboffset(rdev
);
984 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
989 bdevname(rdev
->bdev
, b
);
990 sb
= page_address(rdev
->sb_page
);
992 if (sb
->md_magic
!= MD_SB_MAGIC
) {
993 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
998 if (sb
->major_version
!= 0 ||
999 sb
->minor_version
< 90 ||
1000 sb
->minor_version
> 91) {
1001 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1002 sb
->major_version
, sb
->minor_version
,
1007 if (sb
->raid_disks
<= 0)
1010 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1011 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1016 rdev
->preferred_minor
= sb
->md_minor
;
1017 rdev
->data_offset
= 0;
1018 rdev
->new_data_offset
= 0;
1019 rdev
->sb_size
= MD_SB_BYTES
;
1020 rdev
->badblocks
.shift
= -1;
1022 if (sb
->level
== LEVEL_MULTIPATH
)
1025 rdev
->desc_nr
= sb
->this_disk
.number
;
1031 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1032 if (!uuid_equal(refsb
, sb
)) {
1033 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1034 b
, bdevname(refdev
->bdev
,b2
));
1037 if (!sb_equal(refsb
, sb
)) {
1038 printk(KERN_WARNING
"md: %s has same UUID"
1039 " but different superblock to %s\n",
1040 b
, bdevname(refdev
->bdev
, b2
));
1044 ev2
= md_event(refsb
);
1050 rdev
->sectors
= rdev
->sb_start
;
1051 /* Limit to 4TB as metadata cannot record more than that.
1052 * (not needed for Linear and RAID0 as metadata doesn't
1055 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1056 rdev
->sectors
= (2ULL << 32) - 2;
1058 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1059 /* "this cannot possibly happen" ... */
1067 * validate_super for 0.90.0
1069 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1072 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1073 __u64 ev1
= md_event(sb
);
1075 rdev
->raid_disk
= -1;
1076 clear_bit(Faulty
, &rdev
->flags
);
1077 clear_bit(In_sync
, &rdev
->flags
);
1078 clear_bit(Bitmap_sync
, &rdev
->flags
);
1079 clear_bit(WriteMostly
, &rdev
->flags
);
1081 if (mddev
->raid_disks
== 0) {
1082 mddev
->major_version
= 0;
1083 mddev
->minor_version
= sb
->minor_version
;
1084 mddev
->patch_version
= sb
->patch_version
;
1085 mddev
->external
= 0;
1086 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1087 mddev
->ctime
= sb
->ctime
;
1088 mddev
->utime
= sb
->utime
;
1089 mddev
->level
= sb
->level
;
1090 mddev
->clevel
[0] = 0;
1091 mddev
->layout
= sb
->layout
;
1092 mddev
->raid_disks
= sb
->raid_disks
;
1093 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1094 mddev
->events
= ev1
;
1095 mddev
->bitmap_info
.offset
= 0;
1096 mddev
->bitmap_info
.space
= 0;
1097 /* bitmap can use 60 K after the 4K superblocks */
1098 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1099 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1100 mddev
->reshape_backwards
= 0;
1102 if (mddev
->minor_version
>= 91) {
1103 mddev
->reshape_position
= sb
->reshape_position
;
1104 mddev
->delta_disks
= sb
->delta_disks
;
1105 mddev
->new_level
= sb
->new_level
;
1106 mddev
->new_layout
= sb
->new_layout
;
1107 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1108 if (mddev
->delta_disks
< 0)
1109 mddev
->reshape_backwards
= 1;
1111 mddev
->reshape_position
= MaxSector
;
1112 mddev
->delta_disks
= 0;
1113 mddev
->new_level
= mddev
->level
;
1114 mddev
->new_layout
= mddev
->layout
;
1115 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1118 if (sb
->state
& (1<<MD_SB_CLEAN
))
1119 mddev
->recovery_cp
= MaxSector
;
1121 if (sb
->events_hi
== sb
->cp_events_hi
&&
1122 sb
->events_lo
== sb
->cp_events_lo
) {
1123 mddev
->recovery_cp
= sb
->recovery_cp
;
1125 mddev
->recovery_cp
= 0;
1128 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1129 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1130 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1131 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1133 mddev
->max_disks
= MD_SB_DISKS
;
1135 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1136 mddev
->bitmap_info
.file
== NULL
) {
1137 mddev
->bitmap_info
.offset
=
1138 mddev
->bitmap_info
.default_offset
;
1139 mddev
->bitmap_info
.space
=
1140 mddev
->bitmap_info
.default_space
;
1143 } else if (mddev
->pers
== NULL
) {
1144 /* Insist on good event counter while assembling, except
1145 * for spares (which don't need an event count) */
1147 if (sb
->disks
[rdev
->desc_nr
].state
& (
1148 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1149 if (ev1
< mddev
->events
)
1151 } else if (mddev
->bitmap
) {
1152 /* if adding to array with a bitmap, then we can accept an
1153 * older device ... but not too old.
1155 if (ev1
< mddev
->bitmap
->events_cleared
)
1157 if (ev1
< mddev
->events
)
1158 set_bit(Bitmap_sync
, &rdev
->flags
);
1160 if (ev1
< mddev
->events
)
1161 /* just a hot-add of a new device, leave raid_disk at -1 */
1165 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1166 desc
= sb
->disks
+ rdev
->desc_nr
;
1168 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1169 set_bit(Faulty
, &rdev
->flags
);
1170 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1171 desc->raid_disk < mddev->raid_disks */) {
1172 set_bit(In_sync
, &rdev
->flags
);
1173 rdev
->raid_disk
= desc
->raid_disk
;
1174 rdev
->saved_raid_disk
= desc
->raid_disk
;
1175 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1176 /* active but not in sync implies recovery up to
1177 * reshape position. We don't know exactly where
1178 * that is, so set to zero for now */
1179 if (mddev
->minor_version
>= 91) {
1180 rdev
->recovery_offset
= 0;
1181 rdev
->raid_disk
= desc
->raid_disk
;
1184 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1185 set_bit(WriteMostly
, &rdev
->flags
);
1186 } else /* MULTIPATH are always insync */
1187 set_bit(In_sync
, &rdev
->flags
);
1192 * sync_super for 0.90.0
1194 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1197 struct md_rdev
*rdev2
;
1198 int next_spare
= mddev
->raid_disks
;
1200 /* make rdev->sb match mddev data..
1203 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1204 * 3/ any empty disks < next_spare become removed
1206 * disks[0] gets initialised to REMOVED because
1207 * we cannot be sure from other fields if it has
1208 * been initialised or not.
1211 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1213 rdev
->sb_size
= MD_SB_BYTES
;
1215 sb
= page_address(rdev
->sb_page
);
1217 memset(sb
, 0, sizeof(*sb
));
1219 sb
->md_magic
= MD_SB_MAGIC
;
1220 sb
->major_version
= mddev
->major_version
;
1221 sb
->patch_version
= mddev
->patch_version
;
1222 sb
->gvalid_words
= 0; /* ignored */
1223 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1224 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1225 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1226 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1228 sb
->ctime
= mddev
->ctime
;
1229 sb
->level
= mddev
->level
;
1230 sb
->size
= mddev
->dev_sectors
/ 2;
1231 sb
->raid_disks
= mddev
->raid_disks
;
1232 sb
->md_minor
= mddev
->md_minor
;
1233 sb
->not_persistent
= 0;
1234 sb
->utime
= mddev
->utime
;
1236 sb
->events_hi
= (mddev
->events
>>32);
1237 sb
->events_lo
= (u32
)mddev
->events
;
1239 if (mddev
->reshape_position
== MaxSector
)
1240 sb
->minor_version
= 90;
1242 sb
->minor_version
= 91;
1243 sb
->reshape_position
= mddev
->reshape_position
;
1244 sb
->new_level
= mddev
->new_level
;
1245 sb
->delta_disks
= mddev
->delta_disks
;
1246 sb
->new_layout
= mddev
->new_layout
;
1247 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1249 mddev
->minor_version
= sb
->minor_version
;
1252 sb
->recovery_cp
= mddev
->recovery_cp
;
1253 sb
->cp_events_hi
= (mddev
->events
>>32);
1254 sb
->cp_events_lo
= (u32
)mddev
->events
;
1255 if (mddev
->recovery_cp
== MaxSector
)
1256 sb
->state
= (1<< MD_SB_CLEAN
);
1258 sb
->recovery_cp
= 0;
1260 sb
->layout
= mddev
->layout
;
1261 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1263 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1264 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1266 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1267 rdev_for_each(rdev2
, mddev
) {
1270 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1272 if (rdev2
->raid_disk
>= 0 &&
1273 sb
->minor_version
>= 91)
1274 /* we have nowhere to store the recovery_offset,
1275 * but if it is not below the reshape_position,
1276 * we can piggy-back on that.
1279 if (rdev2
->raid_disk
< 0 ||
1280 test_bit(Faulty
, &rdev2
->flags
))
1283 desc_nr
= rdev2
->raid_disk
;
1285 desc_nr
= next_spare
++;
1286 rdev2
->desc_nr
= desc_nr
;
1287 d
= &sb
->disks
[rdev2
->desc_nr
];
1289 d
->number
= rdev2
->desc_nr
;
1290 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1291 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1293 d
->raid_disk
= rdev2
->raid_disk
;
1295 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1296 if (test_bit(Faulty
, &rdev2
->flags
))
1297 d
->state
= (1<<MD_DISK_FAULTY
);
1298 else if (is_active
) {
1299 d
->state
= (1<<MD_DISK_ACTIVE
);
1300 if (test_bit(In_sync
, &rdev2
->flags
))
1301 d
->state
|= (1<<MD_DISK_SYNC
);
1309 if (test_bit(WriteMostly
, &rdev2
->flags
))
1310 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1312 /* now set the "removed" and "faulty" bits on any missing devices */
1313 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1314 mdp_disk_t
*d
= &sb
->disks
[i
];
1315 if (d
->state
== 0 && d
->number
== 0) {
1318 d
->state
= (1<<MD_DISK_REMOVED
);
1319 d
->state
|= (1<<MD_DISK_FAULTY
);
1323 sb
->nr_disks
= nr_disks
;
1324 sb
->active_disks
= active
;
1325 sb
->working_disks
= working
;
1326 sb
->failed_disks
= failed
;
1327 sb
->spare_disks
= spare
;
1329 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1330 sb
->sb_csum
= calc_sb_csum(sb
);
1334 * rdev_size_change for 0.90.0
1336 static unsigned long long
1337 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1339 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1340 return 0; /* component must fit device */
1341 if (rdev
->mddev
->bitmap_info
.offset
)
1342 return 0; /* can't move bitmap */
1343 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1344 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1345 num_sectors
= rdev
->sb_start
;
1346 /* Limit to 4TB as metadata cannot record more than that.
1347 * 4TB == 2^32 KB, or 2*2^32 sectors.
1349 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1350 num_sectors
= (2ULL << 32) - 2;
1351 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1353 md_super_wait(rdev
->mddev
);
1358 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1360 /* non-zero offset changes not possible with v0.90 */
1361 return new_offset
== 0;
1365 * version 1 superblock
1368 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1372 unsigned long long newcsum
;
1373 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1374 __le32
*isuper
= (__le32
*)sb
;
1376 disk_csum
= sb
->sb_csum
;
1379 for (; size
>= 4; size
-= 4)
1380 newcsum
+= le32_to_cpu(*isuper
++);
1383 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1385 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1386 sb
->sb_csum
= disk_csum
;
1387 return cpu_to_le32(csum
);
1390 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1392 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1394 struct mdp_superblock_1
*sb
;
1398 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1402 * Calculate the position of the superblock in 512byte sectors.
1403 * It is always aligned to a 4K boundary and
1404 * depeding on minor_version, it can be:
1405 * 0: At least 8K, but less than 12K, from end of device
1406 * 1: At start of device
1407 * 2: 4K from start of device.
1409 switch(minor_version
) {
1411 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1413 sb_start
&= ~(sector_t
)(4*2-1);
1424 rdev
->sb_start
= sb_start
;
1426 /* superblock is rarely larger than 1K, but it can be larger,
1427 * and it is safe to read 4k, so we do that
1429 ret
= read_disk_sb(rdev
, 4096);
1430 if (ret
) return ret
;
1432 sb
= page_address(rdev
->sb_page
);
1434 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1435 sb
->major_version
!= cpu_to_le32(1) ||
1436 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1437 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1438 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1441 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1442 printk("md: invalid superblock checksum on %s\n",
1443 bdevname(rdev
->bdev
,b
));
1446 if (le64_to_cpu(sb
->data_size
) < 10) {
1447 printk("md: data_size too small on %s\n",
1448 bdevname(rdev
->bdev
,b
));
1453 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1454 /* Some padding is non-zero, might be a new feature */
1457 rdev
->preferred_minor
= 0xffff;
1458 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1459 rdev
->new_data_offset
= rdev
->data_offset
;
1460 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1461 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1462 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1463 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1465 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1466 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1467 if (rdev
->sb_size
& bmask
)
1468 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1471 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1474 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1477 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1480 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1482 if (!rdev
->bb_page
) {
1483 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1487 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1488 rdev
->badblocks
.count
== 0) {
1489 /* need to load the bad block list.
1490 * Currently we limit it to one page.
1496 int sectors
= le16_to_cpu(sb
->bblog_size
);
1497 if (sectors
> (PAGE_SIZE
/ 512))
1499 offset
= le32_to_cpu(sb
->bblog_offset
);
1502 bb_sector
= (long long)offset
;
1503 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1504 rdev
->bb_page
, READ
, true))
1506 bbp
= (u64
*)page_address(rdev
->bb_page
);
1507 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1508 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1509 u64 bb
= le64_to_cpu(*bbp
);
1510 int count
= bb
& (0x3ff);
1511 u64 sector
= bb
>> 10;
1512 sector
<<= sb
->bblog_shift
;
1513 count
<<= sb
->bblog_shift
;
1516 if (md_set_badblocks(&rdev
->badblocks
,
1517 sector
, count
, 1) == 0)
1520 } else if (sb
->bblog_offset
!= 0)
1521 rdev
->badblocks
.shift
= 0;
1527 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1529 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1530 sb
->level
!= refsb
->level
||
1531 sb
->layout
!= refsb
->layout
||
1532 sb
->chunksize
!= refsb
->chunksize
) {
1533 printk(KERN_WARNING
"md: %s has strangely different"
1534 " superblock to %s\n",
1535 bdevname(rdev
->bdev
,b
),
1536 bdevname(refdev
->bdev
,b2
));
1539 ev1
= le64_to_cpu(sb
->events
);
1540 ev2
= le64_to_cpu(refsb
->events
);
1547 if (minor_version
) {
1548 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1549 sectors
-= rdev
->data_offset
;
1551 sectors
= rdev
->sb_start
;
1552 if (sectors
< le64_to_cpu(sb
->data_size
))
1554 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1558 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1560 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1561 __u64 ev1
= le64_to_cpu(sb
->events
);
1563 rdev
->raid_disk
= -1;
1564 clear_bit(Faulty
, &rdev
->flags
);
1565 clear_bit(In_sync
, &rdev
->flags
);
1566 clear_bit(Bitmap_sync
, &rdev
->flags
);
1567 clear_bit(WriteMostly
, &rdev
->flags
);
1569 if (mddev
->raid_disks
== 0) {
1570 mddev
->major_version
= 1;
1571 mddev
->patch_version
= 0;
1572 mddev
->external
= 0;
1573 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1574 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1575 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1576 mddev
->level
= le32_to_cpu(sb
->level
);
1577 mddev
->clevel
[0] = 0;
1578 mddev
->layout
= le32_to_cpu(sb
->layout
);
1579 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1580 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1581 mddev
->events
= ev1
;
1582 mddev
->bitmap_info
.offset
= 0;
1583 mddev
->bitmap_info
.space
= 0;
1584 /* Default location for bitmap is 1K after superblock
1585 * using 3K - total of 4K
1587 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1588 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1589 mddev
->reshape_backwards
= 0;
1591 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1592 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1594 mddev
->max_disks
= (4096-256)/2;
1596 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1597 mddev
->bitmap_info
.file
== NULL
) {
1598 mddev
->bitmap_info
.offset
=
1599 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1600 /* Metadata doesn't record how much space is available.
1601 * For 1.0, we assume we can use up to the superblock
1602 * if before, else to 4K beyond superblock.
1603 * For others, assume no change is possible.
1605 if (mddev
->minor_version
> 0)
1606 mddev
->bitmap_info
.space
= 0;
1607 else if (mddev
->bitmap_info
.offset
> 0)
1608 mddev
->bitmap_info
.space
=
1609 8 - mddev
->bitmap_info
.offset
;
1611 mddev
->bitmap_info
.space
=
1612 -mddev
->bitmap_info
.offset
;
1615 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1616 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1617 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1618 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1619 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1620 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1621 if (mddev
->delta_disks
< 0 ||
1622 (mddev
->delta_disks
== 0 &&
1623 (le32_to_cpu(sb
->feature_map
)
1624 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1625 mddev
->reshape_backwards
= 1;
1627 mddev
->reshape_position
= MaxSector
;
1628 mddev
->delta_disks
= 0;
1629 mddev
->new_level
= mddev
->level
;
1630 mddev
->new_layout
= mddev
->layout
;
1631 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1634 } else if (mddev
->pers
== NULL
) {
1635 /* Insist of good event counter while assembling, except for
1636 * spares (which don't need an event count) */
1638 if (rdev
->desc_nr
>= 0 &&
1639 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1640 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1641 if (ev1
< mddev
->events
)
1643 } else if (mddev
->bitmap
) {
1644 /* If adding to array with a bitmap, then we can accept an
1645 * older device, but not too old.
1647 if (ev1
< mddev
->bitmap
->events_cleared
)
1649 if (ev1
< mddev
->events
)
1650 set_bit(Bitmap_sync
, &rdev
->flags
);
1652 if (ev1
< mddev
->events
)
1653 /* just a hot-add of a new device, leave raid_disk at -1 */
1656 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1658 if (rdev
->desc_nr
< 0 ||
1659 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1663 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1665 case 0xffff: /* spare */
1667 case 0xfffe: /* faulty */
1668 set_bit(Faulty
, &rdev
->flags
);
1671 rdev
->saved_raid_disk
= role
;
1672 if ((le32_to_cpu(sb
->feature_map
) &
1673 MD_FEATURE_RECOVERY_OFFSET
)) {
1674 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1675 if (!(le32_to_cpu(sb
->feature_map
) &
1676 MD_FEATURE_RECOVERY_BITMAP
))
1677 rdev
->saved_raid_disk
= -1;
1679 set_bit(In_sync
, &rdev
->flags
);
1680 rdev
->raid_disk
= role
;
1683 if (sb
->devflags
& WriteMostly1
)
1684 set_bit(WriteMostly
, &rdev
->flags
);
1685 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1686 set_bit(Replacement
, &rdev
->flags
);
1687 } else /* MULTIPATH are always insync */
1688 set_bit(In_sync
, &rdev
->flags
);
1693 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1695 struct mdp_superblock_1
*sb
;
1696 struct md_rdev
*rdev2
;
1698 /* make rdev->sb match mddev and rdev data. */
1700 sb
= page_address(rdev
->sb_page
);
1702 sb
->feature_map
= 0;
1704 sb
->recovery_offset
= cpu_to_le64(0);
1705 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1707 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1708 sb
->events
= cpu_to_le64(mddev
->events
);
1710 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1712 sb
->resync_offset
= cpu_to_le64(0);
1714 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1716 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1717 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1718 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1719 sb
->level
= cpu_to_le32(mddev
->level
);
1720 sb
->layout
= cpu_to_le32(mddev
->layout
);
1722 if (test_bit(WriteMostly
, &rdev
->flags
))
1723 sb
->devflags
|= WriteMostly1
;
1725 sb
->devflags
&= ~WriteMostly1
;
1726 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1727 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1729 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1730 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1731 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1734 if (rdev
->raid_disk
>= 0 &&
1735 !test_bit(In_sync
, &rdev
->flags
)) {
1737 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1738 sb
->recovery_offset
=
1739 cpu_to_le64(rdev
->recovery_offset
);
1740 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1742 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1744 if (test_bit(Replacement
, &rdev
->flags
))
1746 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1748 if (mddev
->reshape_position
!= MaxSector
) {
1749 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1750 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1751 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1752 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1753 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1754 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1755 if (mddev
->delta_disks
== 0 &&
1756 mddev
->reshape_backwards
)
1758 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1759 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1761 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1762 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1763 - rdev
->data_offset
));
1767 if (rdev
->badblocks
.count
== 0)
1768 /* Nothing to do for bad blocks*/ ;
1769 else if (sb
->bblog_offset
== 0)
1770 /* Cannot record bad blocks on this device */
1771 md_error(mddev
, rdev
);
1773 struct badblocks
*bb
= &rdev
->badblocks
;
1774 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1776 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1781 seq
= read_seqbegin(&bb
->lock
);
1783 memset(bbp
, 0xff, PAGE_SIZE
);
1785 for (i
= 0 ; i
< bb
->count
; i
++) {
1786 u64 internal_bb
= p
[i
];
1787 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1788 | BB_LEN(internal_bb
));
1789 bbp
[i
] = cpu_to_le64(store_bb
);
1792 if (read_seqretry(&bb
->lock
, seq
))
1795 bb
->sector
= (rdev
->sb_start
+
1796 (int)le32_to_cpu(sb
->bblog_offset
));
1797 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1802 rdev_for_each(rdev2
, mddev
)
1803 if (rdev2
->desc_nr
+1 > max_dev
)
1804 max_dev
= rdev2
->desc_nr
+1;
1806 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1808 sb
->max_dev
= cpu_to_le32(max_dev
);
1809 rdev
->sb_size
= max_dev
* 2 + 256;
1810 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1811 if (rdev
->sb_size
& bmask
)
1812 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1814 max_dev
= le32_to_cpu(sb
->max_dev
);
1816 for (i
=0; i
<max_dev
;i
++)
1817 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1819 rdev_for_each(rdev2
, mddev
) {
1821 if (test_bit(Faulty
, &rdev2
->flags
))
1822 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1823 else if (test_bit(In_sync
, &rdev2
->flags
))
1824 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1825 else if (rdev2
->raid_disk
>= 0)
1826 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1828 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1831 sb
->sb_csum
= calc_sb_1_csum(sb
);
1834 static unsigned long long
1835 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1837 struct mdp_superblock_1
*sb
;
1838 sector_t max_sectors
;
1839 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1840 return 0; /* component must fit device */
1841 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1842 return 0; /* too confusing */
1843 if (rdev
->sb_start
< rdev
->data_offset
) {
1844 /* minor versions 1 and 2; superblock before data */
1845 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1846 max_sectors
-= rdev
->data_offset
;
1847 if (!num_sectors
|| num_sectors
> max_sectors
)
1848 num_sectors
= max_sectors
;
1849 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1850 /* minor version 0 with bitmap we can't move */
1853 /* minor version 0; superblock after data */
1855 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1856 sb_start
&= ~(sector_t
)(4*2 - 1);
1857 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1858 if (!num_sectors
|| num_sectors
> max_sectors
)
1859 num_sectors
= max_sectors
;
1860 rdev
->sb_start
= sb_start
;
1862 sb
= page_address(rdev
->sb_page
);
1863 sb
->data_size
= cpu_to_le64(num_sectors
);
1864 sb
->super_offset
= rdev
->sb_start
;
1865 sb
->sb_csum
= calc_sb_1_csum(sb
);
1866 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1868 md_super_wait(rdev
->mddev
);
1874 super_1_allow_new_offset(struct md_rdev
*rdev
,
1875 unsigned long long new_offset
)
1877 /* All necessary checks on new >= old have been done */
1878 struct bitmap
*bitmap
;
1879 if (new_offset
>= rdev
->data_offset
)
1882 /* with 1.0 metadata, there is no metadata to tread on
1883 * so we can always move back */
1884 if (rdev
->mddev
->minor_version
== 0)
1887 /* otherwise we must be sure not to step on
1888 * any metadata, so stay:
1889 * 36K beyond start of superblock
1890 * beyond end of badblocks
1891 * beyond write-intent bitmap
1893 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1895 bitmap
= rdev
->mddev
->bitmap
;
1896 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1897 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1898 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1900 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1906 static struct super_type super_types
[] = {
1909 .owner
= THIS_MODULE
,
1910 .load_super
= super_90_load
,
1911 .validate_super
= super_90_validate
,
1912 .sync_super
= super_90_sync
,
1913 .rdev_size_change
= super_90_rdev_size_change
,
1914 .allow_new_offset
= super_90_allow_new_offset
,
1918 .owner
= THIS_MODULE
,
1919 .load_super
= super_1_load
,
1920 .validate_super
= super_1_validate
,
1921 .sync_super
= super_1_sync
,
1922 .rdev_size_change
= super_1_rdev_size_change
,
1923 .allow_new_offset
= super_1_allow_new_offset
,
1927 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1929 if (mddev
->sync_super
) {
1930 mddev
->sync_super(mddev
, rdev
);
1934 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1936 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1939 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1941 struct md_rdev
*rdev
, *rdev2
;
1944 rdev_for_each_rcu(rdev
, mddev1
)
1945 rdev_for_each_rcu(rdev2
, mddev2
)
1946 if (rdev
->bdev
->bd_contains
==
1947 rdev2
->bdev
->bd_contains
) {
1955 static LIST_HEAD(pending_raid_disks
);
1958 * Try to register data integrity profile for an mddev
1960 * This is called when an array is started and after a disk has been kicked
1961 * from the array. It only succeeds if all working and active component devices
1962 * are integrity capable with matching profiles.
1964 int md_integrity_register(struct mddev
*mddev
)
1966 struct md_rdev
*rdev
, *reference
= NULL
;
1968 if (list_empty(&mddev
->disks
))
1969 return 0; /* nothing to do */
1970 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1971 return 0; /* shouldn't register, or already is */
1972 rdev_for_each(rdev
, mddev
) {
1973 /* skip spares and non-functional disks */
1974 if (test_bit(Faulty
, &rdev
->flags
))
1976 if (rdev
->raid_disk
< 0)
1979 /* Use the first rdev as the reference */
1983 /* does this rdev's profile match the reference profile? */
1984 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1985 rdev
->bdev
->bd_disk
) < 0)
1988 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1991 * All component devices are integrity capable and have matching
1992 * profiles, register the common profile for the md device.
1994 if (blk_integrity_register(mddev
->gendisk
,
1995 bdev_get_integrity(reference
->bdev
)) != 0) {
1996 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2000 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2001 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2002 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2008 EXPORT_SYMBOL(md_integrity_register
);
2010 /* Disable data integrity if non-capable/non-matching disk is being added */
2011 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2013 struct blk_integrity
*bi_rdev
;
2014 struct blk_integrity
*bi_mddev
;
2016 if (!mddev
->gendisk
)
2019 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2020 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2022 if (!bi_mddev
) /* nothing to do */
2024 if (rdev
->raid_disk
< 0) /* skip spares */
2026 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2027 rdev
->bdev
->bd_disk
) >= 0)
2029 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2030 blk_integrity_unregister(mddev
->gendisk
);
2032 EXPORT_SYMBOL(md_integrity_add_rdev
);
2034 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2036 char b
[BDEVNAME_SIZE
];
2041 /* prevent duplicates */
2042 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2045 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2046 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2047 rdev
->sectors
< mddev
->dev_sectors
)) {
2049 /* Cannot change size, so fail
2050 * If mddev->level <= 0, then we don't care
2051 * about aligning sizes (e.g. linear)
2053 if (mddev
->level
> 0)
2056 mddev
->dev_sectors
= rdev
->sectors
;
2059 /* Verify rdev->desc_nr is unique.
2060 * If it is -1, assign a free number, else
2061 * check number is not in use
2064 if (rdev
->desc_nr
< 0) {
2067 choice
= mddev
->raid_disks
;
2068 while (find_rdev_nr_rcu(mddev
, choice
))
2070 rdev
->desc_nr
= choice
;
2072 if (find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2078 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2079 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2080 mdname(mddev
), mddev
->max_disks
);
2083 bdevname(rdev
->bdev
,b
);
2084 while ( (s
=strchr(b
, '/')) != NULL
)
2087 rdev
->mddev
= mddev
;
2088 printk(KERN_INFO
"md: bind<%s>\n", b
);
2090 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2093 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2094 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2095 /* failure here is OK */;
2096 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2098 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2099 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2101 /* May as well allow recovery to be retried once */
2102 mddev
->recovery_disabled
++;
2107 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2112 static void md_delayed_delete(struct work_struct
*ws
)
2114 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2115 kobject_del(&rdev
->kobj
);
2116 kobject_put(&rdev
->kobj
);
2119 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2121 char b
[BDEVNAME_SIZE
];
2123 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2124 list_del_rcu(&rdev
->same_set
);
2125 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2127 sysfs_remove_link(&rdev
->kobj
, "block");
2128 sysfs_put(rdev
->sysfs_state
);
2129 rdev
->sysfs_state
= NULL
;
2130 rdev
->badblocks
.count
= 0;
2131 /* We need to delay this, otherwise we can deadlock when
2132 * writing to 'remove' to "dev/state". We also need
2133 * to delay it due to rcu usage.
2136 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2137 kobject_get(&rdev
->kobj
);
2138 queue_work(md_misc_wq
, &rdev
->del_work
);
2142 * prevent the device from being mounted, repartitioned or
2143 * otherwise reused by a RAID array (or any other kernel
2144 * subsystem), by bd_claiming the device.
2146 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2149 struct block_device
*bdev
;
2150 char b
[BDEVNAME_SIZE
];
2152 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2153 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2155 printk(KERN_ERR
"md: could not open %s.\n",
2156 __bdevname(dev
, b
));
2157 return PTR_ERR(bdev
);
2163 static void unlock_rdev(struct md_rdev
*rdev
)
2165 struct block_device
*bdev
= rdev
->bdev
;
2167 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2170 void md_autodetect_dev(dev_t dev
);
2172 static void export_rdev(struct md_rdev
*rdev
)
2174 char b
[BDEVNAME_SIZE
];
2176 printk(KERN_INFO
"md: export_rdev(%s)\n",
2177 bdevname(rdev
->bdev
,b
));
2178 md_rdev_clear(rdev
);
2180 if (test_bit(AutoDetected
, &rdev
->flags
))
2181 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2184 kobject_put(&rdev
->kobj
);
2187 static void kick_rdev_from_array(struct md_rdev
*rdev
)
2189 unbind_rdev_from_array(rdev
);
2193 static void export_array(struct mddev
*mddev
)
2195 struct md_rdev
*rdev
;
2197 while (!list_empty(&mddev
->disks
)) {
2198 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2200 kick_rdev_from_array(rdev
);
2202 mddev
->raid_disks
= 0;
2203 mddev
->major_version
= 0;
2206 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2208 /* Update each superblock (in-memory image), but
2209 * if we are allowed to, skip spares which already
2210 * have the right event counter, or have one earlier
2211 * (which would mean they aren't being marked as dirty
2212 * with the rest of the array)
2214 struct md_rdev
*rdev
;
2215 rdev_for_each(rdev
, mddev
) {
2216 if (rdev
->sb_events
== mddev
->events
||
2218 rdev
->raid_disk
< 0 &&
2219 rdev
->sb_events
+1 == mddev
->events
)) {
2220 /* Don't update this superblock */
2221 rdev
->sb_loaded
= 2;
2223 sync_super(mddev
, rdev
);
2224 rdev
->sb_loaded
= 1;
2229 static void md_update_sb(struct mddev
*mddev
, int force_change
)
2231 struct md_rdev
*rdev
;
2234 int any_badblocks_changed
= 0;
2238 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2242 /* First make sure individual recovery_offsets are correct */
2243 rdev_for_each(rdev
, mddev
) {
2244 if (rdev
->raid_disk
>= 0 &&
2245 mddev
->delta_disks
>= 0 &&
2246 !test_bit(In_sync
, &rdev
->flags
) &&
2247 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2248 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2251 if (!mddev
->persistent
) {
2252 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2253 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2254 if (!mddev
->external
) {
2255 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2256 rdev_for_each(rdev
, mddev
) {
2257 if (rdev
->badblocks
.changed
) {
2258 rdev
->badblocks
.changed
= 0;
2259 md_ack_all_badblocks(&rdev
->badblocks
);
2260 md_error(mddev
, rdev
);
2262 clear_bit(Blocked
, &rdev
->flags
);
2263 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2264 wake_up(&rdev
->blocked_wait
);
2267 wake_up(&mddev
->sb_wait
);
2271 spin_lock(&mddev
->lock
);
2273 mddev
->utime
= get_seconds();
2275 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2277 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2278 /* just a clean<-> dirty transition, possibly leave spares alone,
2279 * though if events isn't the right even/odd, we will have to do
2285 if (mddev
->degraded
)
2286 /* If the array is degraded, then skipping spares is both
2287 * dangerous and fairly pointless.
2288 * Dangerous because a device that was removed from the array
2289 * might have a event_count that still looks up-to-date,
2290 * so it can be re-added without a resync.
2291 * Pointless because if there are any spares to skip,
2292 * then a recovery will happen and soon that array won't
2293 * be degraded any more and the spare can go back to sleep then.
2297 sync_req
= mddev
->in_sync
;
2299 /* If this is just a dirty<->clean transition, and the array is clean
2300 * and 'events' is odd, we can roll back to the previous clean state */
2302 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2303 && mddev
->can_decrease_events
2304 && mddev
->events
!= 1) {
2306 mddev
->can_decrease_events
= 0;
2308 /* otherwise we have to go forward and ... */
2310 mddev
->can_decrease_events
= nospares
;
2314 * This 64-bit counter should never wrap.
2315 * Either we are in around ~1 trillion A.C., assuming
2316 * 1 reboot per second, or we have a bug...
2318 WARN_ON(mddev
->events
== 0);
2320 rdev_for_each(rdev
, mddev
) {
2321 if (rdev
->badblocks
.changed
)
2322 any_badblocks_changed
++;
2323 if (test_bit(Faulty
, &rdev
->flags
))
2324 set_bit(FaultRecorded
, &rdev
->flags
);
2327 sync_sbs(mddev
, nospares
);
2328 spin_unlock(&mddev
->lock
);
2330 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2331 mdname(mddev
), mddev
->in_sync
);
2333 bitmap_update_sb(mddev
->bitmap
);
2334 rdev_for_each(rdev
, mddev
) {
2335 char b
[BDEVNAME_SIZE
];
2337 if (rdev
->sb_loaded
!= 1)
2338 continue; /* no noise on spare devices */
2340 if (!test_bit(Faulty
, &rdev
->flags
)) {
2341 md_super_write(mddev
,rdev
,
2342 rdev
->sb_start
, rdev
->sb_size
,
2344 pr_debug("md: (write) %s's sb offset: %llu\n",
2345 bdevname(rdev
->bdev
, b
),
2346 (unsigned long long)rdev
->sb_start
);
2347 rdev
->sb_events
= mddev
->events
;
2348 if (rdev
->badblocks
.size
) {
2349 md_super_write(mddev
, rdev
,
2350 rdev
->badblocks
.sector
,
2351 rdev
->badblocks
.size
<< 9,
2353 rdev
->badblocks
.size
= 0;
2357 pr_debug("md: %s (skipping faulty)\n",
2358 bdevname(rdev
->bdev
, b
));
2360 if (mddev
->level
== LEVEL_MULTIPATH
)
2361 /* only need to write one superblock... */
2364 md_super_wait(mddev
);
2365 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2367 spin_lock(&mddev
->lock
);
2368 if (mddev
->in_sync
!= sync_req
||
2369 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2370 /* have to write it out again */
2371 spin_unlock(&mddev
->lock
);
2374 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2375 spin_unlock(&mddev
->lock
);
2376 wake_up(&mddev
->sb_wait
);
2377 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2378 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2380 rdev_for_each(rdev
, mddev
) {
2381 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2382 clear_bit(Blocked
, &rdev
->flags
);
2384 if (any_badblocks_changed
)
2385 md_ack_all_badblocks(&rdev
->badblocks
);
2386 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2387 wake_up(&rdev
->blocked_wait
);
2391 /* words written to sysfs files may, or may not, be \n terminated.
2392 * We want to accept with case. For this we use cmd_match.
2394 static int cmd_match(const char *cmd
, const char *str
)
2396 /* See if cmd, written into a sysfs file, matches
2397 * str. They must either be the same, or cmd can
2398 * have a trailing newline
2400 while (*cmd
&& *str
&& *cmd
== *str
) {
2411 struct rdev_sysfs_entry
{
2412 struct attribute attr
;
2413 ssize_t (*show
)(struct md_rdev
*, char *);
2414 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2418 state_show(struct md_rdev
*rdev
, char *page
)
2422 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2424 if (test_bit(Faulty
, &flags
) ||
2425 rdev
->badblocks
.unacked_exist
) {
2426 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2429 if (test_bit(In_sync
, &flags
)) {
2430 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2433 if (test_bit(WriteMostly
, &flags
)) {
2434 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2437 if (test_bit(Blocked
, &flags
) ||
2438 (rdev
->badblocks
.unacked_exist
2439 && !test_bit(Faulty
, &flags
))) {
2440 len
+= sprintf(page
+len
, "%sblocked", sep
);
2443 if (!test_bit(Faulty
, &flags
) &&
2444 !test_bit(In_sync
, &flags
)) {
2445 len
+= sprintf(page
+len
, "%sspare", sep
);
2448 if (test_bit(WriteErrorSeen
, &flags
)) {
2449 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2452 if (test_bit(WantReplacement
, &flags
)) {
2453 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2456 if (test_bit(Replacement
, &flags
)) {
2457 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2461 return len
+sprintf(page
+len
, "\n");
2465 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2468 * faulty - simulates an error
2469 * remove - disconnects the device
2470 * writemostly - sets write_mostly
2471 * -writemostly - clears write_mostly
2472 * blocked - sets the Blocked flags
2473 * -blocked - clears the Blocked and possibly simulates an error
2474 * insync - sets Insync providing device isn't active
2475 * -insync - clear Insync for a device with a slot assigned,
2476 * so that it gets rebuilt based on bitmap
2477 * write_error - sets WriteErrorSeen
2478 * -write_error - clears WriteErrorSeen
2481 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2482 md_error(rdev
->mddev
, rdev
);
2483 if (test_bit(Faulty
, &rdev
->flags
))
2487 } else if (cmd_match(buf
, "remove")) {
2488 if (rdev
->raid_disk
>= 0)
2491 struct mddev
*mddev
= rdev
->mddev
;
2492 kick_rdev_from_array(rdev
);
2494 md_update_sb(mddev
, 1);
2495 md_new_event(mddev
);
2498 } else if (cmd_match(buf
, "writemostly")) {
2499 set_bit(WriteMostly
, &rdev
->flags
);
2501 } else if (cmd_match(buf
, "-writemostly")) {
2502 clear_bit(WriteMostly
, &rdev
->flags
);
2504 } else if (cmd_match(buf
, "blocked")) {
2505 set_bit(Blocked
, &rdev
->flags
);
2507 } else if (cmd_match(buf
, "-blocked")) {
2508 if (!test_bit(Faulty
, &rdev
->flags
) &&
2509 rdev
->badblocks
.unacked_exist
) {
2510 /* metadata handler doesn't understand badblocks,
2511 * so we need to fail the device
2513 md_error(rdev
->mddev
, rdev
);
2515 clear_bit(Blocked
, &rdev
->flags
);
2516 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2517 wake_up(&rdev
->blocked_wait
);
2518 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2519 md_wakeup_thread(rdev
->mddev
->thread
);
2522 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2523 set_bit(In_sync
, &rdev
->flags
);
2525 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2526 if (rdev
->mddev
->pers
== NULL
) {
2527 clear_bit(In_sync
, &rdev
->flags
);
2528 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2529 rdev
->raid_disk
= -1;
2532 } else if (cmd_match(buf
, "write_error")) {
2533 set_bit(WriteErrorSeen
, &rdev
->flags
);
2535 } else if (cmd_match(buf
, "-write_error")) {
2536 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2538 } else if (cmd_match(buf
, "want_replacement")) {
2539 /* Any non-spare device that is not a replacement can
2540 * become want_replacement at any time, but we then need to
2541 * check if recovery is needed.
2543 if (rdev
->raid_disk
>= 0 &&
2544 !test_bit(Replacement
, &rdev
->flags
))
2545 set_bit(WantReplacement
, &rdev
->flags
);
2546 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2547 md_wakeup_thread(rdev
->mddev
->thread
);
2549 } else if (cmd_match(buf
, "-want_replacement")) {
2550 /* Clearing 'want_replacement' is always allowed.
2551 * Once replacements starts it is too late though.
2554 clear_bit(WantReplacement
, &rdev
->flags
);
2555 } else if (cmd_match(buf
, "replacement")) {
2556 /* Can only set a device as a replacement when array has not
2557 * yet been started. Once running, replacement is automatic
2558 * from spares, or by assigning 'slot'.
2560 if (rdev
->mddev
->pers
)
2563 set_bit(Replacement
, &rdev
->flags
);
2566 } else if (cmd_match(buf
, "-replacement")) {
2567 /* Similarly, can only clear Replacement before start */
2568 if (rdev
->mddev
->pers
)
2571 clear_bit(Replacement
, &rdev
->flags
);
2576 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2577 return err
? err
: len
;
2579 static struct rdev_sysfs_entry rdev_state
=
2580 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2583 errors_show(struct md_rdev
*rdev
, char *page
)
2585 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2589 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2592 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2593 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2594 atomic_set(&rdev
->corrected_errors
, n
);
2599 static struct rdev_sysfs_entry rdev_errors
=
2600 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2603 slot_show(struct md_rdev
*rdev
, char *page
)
2605 if (rdev
->raid_disk
< 0)
2606 return sprintf(page
, "none\n");
2608 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2612 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2616 int slot
= simple_strtoul(buf
, &e
, 10);
2617 if (strncmp(buf
, "none", 4)==0)
2619 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2621 if (rdev
->mddev
->pers
&& slot
== -1) {
2622 /* Setting 'slot' on an active array requires also
2623 * updating the 'rd%d' link, and communicating
2624 * with the personality with ->hot_*_disk.
2625 * For now we only support removing
2626 * failed/spare devices. This normally happens automatically,
2627 * but not when the metadata is externally managed.
2629 if (rdev
->raid_disk
== -1)
2631 /* personality does all needed checks */
2632 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2634 clear_bit(Blocked
, &rdev
->flags
);
2635 remove_and_add_spares(rdev
->mddev
, rdev
);
2636 if (rdev
->raid_disk
>= 0)
2638 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2639 md_wakeup_thread(rdev
->mddev
->thread
);
2640 } else if (rdev
->mddev
->pers
) {
2641 /* Activating a spare .. or possibly reactivating
2642 * if we ever get bitmaps working here.
2645 if (rdev
->raid_disk
!= -1)
2648 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2651 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2654 if (slot
>= rdev
->mddev
->raid_disks
&&
2655 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2658 rdev
->raid_disk
= slot
;
2659 if (test_bit(In_sync
, &rdev
->flags
))
2660 rdev
->saved_raid_disk
= slot
;
2662 rdev
->saved_raid_disk
= -1;
2663 clear_bit(In_sync
, &rdev
->flags
);
2664 clear_bit(Bitmap_sync
, &rdev
->flags
);
2665 err
= rdev
->mddev
->pers
->
2666 hot_add_disk(rdev
->mddev
, rdev
);
2668 rdev
->raid_disk
= -1;
2671 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2672 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2673 /* failure here is OK */;
2674 /* don't wakeup anyone, leave that to userspace. */
2676 if (slot
>= rdev
->mddev
->raid_disks
&&
2677 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2679 rdev
->raid_disk
= slot
;
2680 /* assume it is working */
2681 clear_bit(Faulty
, &rdev
->flags
);
2682 clear_bit(WriteMostly
, &rdev
->flags
);
2683 set_bit(In_sync
, &rdev
->flags
);
2684 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2689 static struct rdev_sysfs_entry rdev_slot
=
2690 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2693 offset_show(struct md_rdev
*rdev
, char *page
)
2695 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2699 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2701 unsigned long long offset
;
2702 if (kstrtoull(buf
, 10, &offset
) < 0)
2704 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2706 if (rdev
->sectors
&& rdev
->mddev
->external
)
2707 /* Must set offset before size, so overlap checks
2710 rdev
->data_offset
= offset
;
2711 rdev
->new_data_offset
= offset
;
2715 static struct rdev_sysfs_entry rdev_offset
=
2716 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2718 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2720 return sprintf(page
, "%llu\n",
2721 (unsigned long long)rdev
->new_data_offset
);
2724 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2725 const char *buf
, size_t len
)
2727 unsigned long long new_offset
;
2728 struct mddev
*mddev
= rdev
->mddev
;
2730 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2733 if (mddev
->sync_thread
||
2734 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2736 if (new_offset
== rdev
->data_offset
)
2737 /* reset is always permitted */
2739 else if (new_offset
> rdev
->data_offset
) {
2740 /* must not push array size beyond rdev_sectors */
2741 if (new_offset
- rdev
->data_offset
2742 + mddev
->dev_sectors
> rdev
->sectors
)
2745 /* Metadata worries about other space details. */
2747 /* decreasing the offset is inconsistent with a backwards
2750 if (new_offset
< rdev
->data_offset
&&
2751 mddev
->reshape_backwards
)
2753 /* Increasing offset is inconsistent with forwards
2754 * reshape. reshape_direction should be set to
2755 * 'backwards' first.
2757 if (new_offset
> rdev
->data_offset
&&
2758 !mddev
->reshape_backwards
)
2761 if (mddev
->pers
&& mddev
->persistent
&&
2762 !super_types
[mddev
->major_version
]
2763 .allow_new_offset(rdev
, new_offset
))
2765 rdev
->new_data_offset
= new_offset
;
2766 if (new_offset
> rdev
->data_offset
)
2767 mddev
->reshape_backwards
= 1;
2768 else if (new_offset
< rdev
->data_offset
)
2769 mddev
->reshape_backwards
= 0;
2773 static struct rdev_sysfs_entry rdev_new_offset
=
2774 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2777 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2779 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2782 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2784 /* check if two start/length pairs overlap */
2792 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2794 unsigned long long blocks
;
2797 if (kstrtoull(buf
, 10, &blocks
) < 0)
2800 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2801 return -EINVAL
; /* sector conversion overflow */
2804 if (new != blocks
* 2)
2805 return -EINVAL
; /* unsigned long long to sector_t overflow */
2812 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2814 struct mddev
*my_mddev
= rdev
->mddev
;
2815 sector_t oldsectors
= rdev
->sectors
;
2818 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2820 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2821 return -EINVAL
; /* too confusing */
2822 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2823 if (my_mddev
->persistent
) {
2824 sectors
= super_types
[my_mddev
->major_version
].
2825 rdev_size_change(rdev
, sectors
);
2828 } else if (!sectors
)
2829 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2831 if (!my_mddev
->pers
->resize
)
2832 /* Cannot change size for RAID0 or Linear etc */
2835 if (sectors
< my_mddev
->dev_sectors
)
2836 return -EINVAL
; /* component must fit device */
2838 rdev
->sectors
= sectors
;
2839 if (sectors
> oldsectors
&& my_mddev
->external
) {
2840 /* Need to check that all other rdevs with the same
2841 * ->bdev do not overlap. 'rcu' is sufficient to walk
2842 * the rdev lists safely.
2843 * This check does not provide a hard guarantee, it
2844 * just helps avoid dangerous mistakes.
2846 struct mddev
*mddev
;
2848 struct list_head
*tmp
;
2851 for_each_mddev(mddev
, tmp
) {
2852 struct md_rdev
*rdev2
;
2854 rdev_for_each(rdev2
, mddev
)
2855 if (rdev
->bdev
== rdev2
->bdev
&&
2857 overlaps(rdev
->data_offset
, rdev
->sectors
,
2870 /* Someone else could have slipped in a size
2871 * change here, but doing so is just silly.
2872 * We put oldsectors back because we *know* it is
2873 * safe, and trust userspace not to race with
2876 rdev
->sectors
= oldsectors
;
2883 static struct rdev_sysfs_entry rdev_size
=
2884 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2886 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2888 unsigned long long recovery_start
= rdev
->recovery_offset
;
2890 if (test_bit(In_sync
, &rdev
->flags
) ||
2891 recovery_start
== MaxSector
)
2892 return sprintf(page
, "none\n");
2894 return sprintf(page
, "%llu\n", recovery_start
);
2897 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2899 unsigned long long recovery_start
;
2901 if (cmd_match(buf
, "none"))
2902 recovery_start
= MaxSector
;
2903 else if (kstrtoull(buf
, 10, &recovery_start
))
2906 if (rdev
->mddev
->pers
&&
2907 rdev
->raid_disk
>= 0)
2910 rdev
->recovery_offset
= recovery_start
;
2911 if (recovery_start
== MaxSector
)
2912 set_bit(In_sync
, &rdev
->flags
);
2914 clear_bit(In_sync
, &rdev
->flags
);
2918 static struct rdev_sysfs_entry rdev_recovery_start
=
2919 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2922 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2924 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2926 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2928 return badblocks_show(&rdev
->badblocks
, page
, 0);
2930 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2932 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2933 /* Maybe that ack was all we needed */
2934 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2935 wake_up(&rdev
->blocked_wait
);
2938 static struct rdev_sysfs_entry rdev_bad_blocks
=
2939 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2941 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2943 return badblocks_show(&rdev
->badblocks
, page
, 1);
2945 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2947 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2949 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2950 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2952 static struct attribute
*rdev_default_attrs
[] = {
2957 &rdev_new_offset
.attr
,
2959 &rdev_recovery_start
.attr
,
2960 &rdev_bad_blocks
.attr
,
2961 &rdev_unack_bad_blocks
.attr
,
2965 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2967 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2968 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2974 return entry
->show(rdev
, page
);
2978 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2979 const char *page
, size_t length
)
2981 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2982 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2984 struct mddev
*mddev
= rdev
->mddev
;
2988 if (!capable(CAP_SYS_ADMIN
))
2990 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2992 if (rdev
->mddev
== NULL
)
2995 rv
= entry
->store(rdev
, page
, length
);
2996 mddev_unlock(mddev
);
3001 static void rdev_free(struct kobject
*ko
)
3003 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3006 static const struct sysfs_ops rdev_sysfs_ops
= {
3007 .show
= rdev_attr_show
,
3008 .store
= rdev_attr_store
,
3010 static struct kobj_type rdev_ktype
= {
3011 .release
= rdev_free
,
3012 .sysfs_ops
= &rdev_sysfs_ops
,
3013 .default_attrs
= rdev_default_attrs
,
3016 int md_rdev_init(struct md_rdev
*rdev
)
3019 rdev
->saved_raid_disk
= -1;
3020 rdev
->raid_disk
= -1;
3022 rdev
->data_offset
= 0;
3023 rdev
->new_data_offset
= 0;
3024 rdev
->sb_events
= 0;
3025 rdev
->last_read_error
.tv_sec
= 0;
3026 rdev
->last_read_error
.tv_nsec
= 0;
3027 rdev
->sb_loaded
= 0;
3028 rdev
->bb_page
= NULL
;
3029 atomic_set(&rdev
->nr_pending
, 0);
3030 atomic_set(&rdev
->read_errors
, 0);
3031 atomic_set(&rdev
->corrected_errors
, 0);
3033 INIT_LIST_HEAD(&rdev
->same_set
);
3034 init_waitqueue_head(&rdev
->blocked_wait
);
3036 /* Add space to store bad block list.
3037 * This reserves the space even on arrays where it cannot
3038 * be used - I wonder if that matters
3040 rdev
->badblocks
.count
= 0;
3041 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3042 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3043 seqlock_init(&rdev
->badblocks
.lock
);
3044 if (rdev
->badblocks
.page
== NULL
)
3049 EXPORT_SYMBOL_GPL(md_rdev_init
);
3051 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3053 * mark the device faulty if:
3055 * - the device is nonexistent (zero size)
3056 * - the device has no valid superblock
3058 * a faulty rdev _never_ has rdev->sb set.
3060 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3062 char b
[BDEVNAME_SIZE
];
3064 struct md_rdev
*rdev
;
3067 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3069 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3070 return ERR_PTR(-ENOMEM
);
3073 err
= md_rdev_init(rdev
);
3076 err
= alloc_disk_sb(rdev
);
3080 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3084 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3086 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3089 "md: %s has zero or unknown size, marking faulty!\n",
3090 bdevname(rdev
->bdev
,b
));
3095 if (super_format
>= 0) {
3096 err
= super_types
[super_format
].
3097 load_super(rdev
, NULL
, super_minor
);
3098 if (err
== -EINVAL
) {
3100 "md: %s does not have a valid v%d.%d "
3101 "superblock, not importing!\n",
3102 bdevname(rdev
->bdev
,b
),
3103 super_format
, super_minor
);
3108 "md: could not read %s's sb, not importing!\n",
3109 bdevname(rdev
->bdev
,b
));
3119 md_rdev_clear(rdev
);
3121 return ERR_PTR(err
);
3125 * Check a full RAID array for plausibility
3128 static void analyze_sbs(struct mddev
*mddev
)
3131 struct md_rdev
*rdev
, *freshest
, *tmp
;
3132 char b
[BDEVNAME_SIZE
];
3135 rdev_for_each_safe(rdev
, tmp
, mddev
)
3136 switch (super_types
[mddev
->major_version
].
3137 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3145 "md: fatal superblock inconsistency in %s"
3146 " -- removing from array\n",
3147 bdevname(rdev
->bdev
,b
));
3148 kick_rdev_from_array(rdev
);
3151 super_types
[mddev
->major_version
].
3152 validate_super(mddev
, freshest
);
3155 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3156 if (mddev
->max_disks
&&
3157 (rdev
->desc_nr
>= mddev
->max_disks
||
3158 i
> mddev
->max_disks
)) {
3160 "md: %s: %s: only %d devices permitted\n",
3161 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3163 kick_rdev_from_array(rdev
);
3166 if (rdev
!= freshest
)
3167 if (super_types
[mddev
->major_version
].
3168 validate_super(mddev
, rdev
)) {
3169 printk(KERN_WARNING
"md: kicking non-fresh %s"
3171 bdevname(rdev
->bdev
,b
));
3172 kick_rdev_from_array(rdev
);
3175 if (mddev
->level
== LEVEL_MULTIPATH
) {
3176 rdev
->desc_nr
= i
++;
3177 rdev
->raid_disk
= rdev
->desc_nr
;
3178 set_bit(In_sync
, &rdev
->flags
);
3179 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3180 rdev
->raid_disk
= -1;
3181 clear_bit(In_sync
, &rdev
->flags
);
3186 /* Read a fixed-point number.
3187 * Numbers in sysfs attributes should be in "standard" units where
3188 * possible, so time should be in seconds.
3189 * However we internally use a a much smaller unit such as
3190 * milliseconds or jiffies.
3191 * This function takes a decimal number with a possible fractional
3192 * component, and produces an integer which is the result of
3193 * multiplying that number by 10^'scale'.
3194 * all without any floating-point arithmetic.
3196 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3198 unsigned long result
= 0;
3200 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3203 else if (decimals
< scale
) {
3206 result
= result
* 10 + value
;
3218 while (decimals
< scale
) {
3226 static void md_safemode_timeout(unsigned long data
);
3229 safe_delay_show(struct mddev
*mddev
, char *page
)
3231 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3232 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3235 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3239 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3242 mddev
->safemode_delay
= 0;
3244 unsigned long old_delay
= mddev
->safemode_delay
;
3245 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3246 if (mddev
->safemode_delay
== 0)
3247 mddev
->safemode_delay
= 1;
3248 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3249 md_safemode_timeout((unsigned long)mddev
);
3253 static struct md_sysfs_entry md_safe_delay
=
3254 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3257 level_show(struct mddev
*mddev
, char *page
)
3259 struct md_personality
*p
;
3261 spin_lock(&mddev
->lock
);
3264 ret
= sprintf(page
, "%s\n", p
->name
);
3265 else if (mddev
->clevel
[0])
3266 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3267 else if (mddev
->level
!= LEVEL_NONE
)
3268 ret
= sprintf(page
, "%d\n", mddev
->level
);
3271 spin_unlock(&mddev
->lock
);
3276 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3280 struct md_personality
*pers
, *oldpers
;
3282 void *priv
, *oldpriv
;
3283 struct md_rdev
*rdev
;
3285 if (mddev
->pers
== NULL
) {
3288 if (len
>= sizeof(mddev
->clevel
))
3290 strncpy(mddev
->clevel
, buf
, len
);
3291 if (mddev
->clevel
[len
-1] == '\n')
3293 mddev
->clevel
[len
] = 0;
3294 mddev
->level
= LEVEL_NONE
;
3300 /* request to change the personality. Need to ensure:
3301 * - array is not engaged in resync/recovery/reshape
3302 * - old personality can be suspended
3303 * - new personality will access other array.
3306 if (mddev
->sync_thread
||
3307 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3308 mddev
->reshape_position
!= MaxSector
||
3309 mddev
->sysfs_active
)
3312 if (!mddev
->pers
->quiesce
) {
3313 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3314 mdname(mddev
), mddev
->pers
->name
);
3318 /* Now find the new personality */
3319 if (len
== 0 || len
>= sizeof(clevel
))
3321 strncpy(clevel
, buf
, len
);
3322 if (clevel
[len
-1] == '\n')
3325 if (kstrtol(clevel
, 10, &level
))
3328 if (request_module("md-%s", clevel
) != 0)
3329 request_module("md-level-%s", clevel
);
3330 spin_lock(&pers_lock
);
3331 pers
= find_pers(level
, clevel
);
3332 if (!pers
|| !try_module_get(pers
->owner
)) {
3333 spin_unlock(&pers_lock
);
3334 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3337 spin_unlock(&pers_lock
);
3339 if (pers
== mddev
->pers
) {
3340 /* Nothing to do! */
3341 module_put(pers
->owner
);
3344 if (!pers
->takeover
) {
3345 module_put(pers
->owner
);
3346 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3347 mdname(mddev
), clevel
);
3351 rdev_for_each(rdev
, mddev
)
3352 rdev
->new_raid_disk
= rdev
->raid_disk
;
3354 /* ->takeover must set new_* and/or delta_disks
3355 * if it succeeds, and may set them when it fails.
3357 priv
= pers
->takeover(mddev
);
3359 mddev
->new_level
= mddev
->level
;
3360 mddev
->new_layout
= mddev
->layout
;
3361 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3362 mddev
->raid_disks
-= mddev
->delta_disks
;
3363 mddev
->delta_disks
= 0;
3364 mddev
->reshape_backwards
= 0;
3365 module_put(pers
->owner
);
3366 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3367 mdname(mddev
), clevel
);
3368 return PTR_ERR(priv
);
3371 /* Looks like we have a winner */
3372 mddev_suspend(mddev
);
3373 mddev_detach(mddev
);
3375 spin_lock(&mddev
->lock
);
3376 oldpers
= mddev
->pers
;
3377 oldpriv
= mddev
->private;
3379 mddev
->private = priv
;
3380 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3381 mddev
->level
= mddev
->new_level
;
3382 mddev
->layout
= mddev
->new_layout
;
3383 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3384 mddev
->delta_disks
= 0;
3385 mddev
->reshape_backwards
= 0;
3386 mddev
->degraded
= 0;
3387 spin_unlock(&mddev
->lock
);
3389 if (oldpers
->sync_request
== NULL
&&
3391 /* We are converting from a no-redundancy array
3392 * to a redundancy array and metadata is managed
3393 * externally so we need to be sure that writes
3394 * won't block due to a need to transition
3396 * until external management is started.
3399 mddev
->safemode_delay
= 0;
3400 mddev
->safemode
= 0;
3403 oldpers
->free(mddev
, oldpriv
);
3405 if (oldpers
->sync_request
== NULL
&&
3406 pers
->sync_request
!= NULL
) {
3407 /* need to add the md_redundancy_group */
3408 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3410 "md: cannot register extra attributes for %s\n",
3412 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3414 if (oldpers
->sync_request
!= NULL
&&
3415 pers
->sync_request
== NULL
) {
3416 /* need to remove the md_redundancy_group */
3417 if (mddev
->to_remove
== NULL
)
3418 mddev
->to_remove
= &md_redundancy_group
;
3421 rdev_for_each(rdev
, mddev
) {
3422 if (rdev
->raid_disk
< 0)
3424 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3425 rdev
->new_raid_disk
= -1;
3426 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3428 sysfs_unlink_rdev(mddev
, rdev
);
3430 rdev_for_each(rdev
, mddev
) {
3431 if (rdev
->raid_disk
< 0)
3433 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3435 rdev
->raid_disk
= rdev
->new_raid_disk
;
3436 if (rdev
->raid_disk
< 0)
3437 clear_bit(In_sync
, &rdev
->flags
);
3439 if (sysfs_link_rdev(mddev
, rdev
))
3440 printk(KERN_WARNING
"md: cannot register rd%d"
3441 " for %s after level change\n",
3442 rdev
->raid_disk
, mdname(mddev
));
3446 if (pers
->sync_request
== NULL
) {
3447 /* this is now an array without redundancy, so
3448 * it must always be in_sync
3451 del_timer_sync(&mddev
->safemode_timer
);
3453 blk_set_stacking_limits(&mddev
->queue
->limits
);
3455 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3456 mddev_resume(mddev
);
3458 md_update_sb(mddev
, 1);
3459 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3460 md_new_event(mddev
);
3464 static struct md_sysfs_entry md_level
=
3465 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3468 layout_show(struct mddev
*mddev
, char *page
)
3470 /* just a number, not meaningful for all levels */
3471 if (mddev
->reshape_position
!= MaxSector
&&
3472 mddev
->layout
!= mddev
->new_layout
)
3473 return sprintf(page
, "%d (%d)\n",
3474 mddev
->new_layout
, mddev
->layout
);
3475 return sprintf(page
, "%d\n", mddev
->layout
);
3479 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3482 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3484 if (!*buf
|| (*e
&& *e
!= '\n'))
3489 if (mddev
->pers
->check_reshape
== NULL
)
3493 mddev
->new_layout
= n
;
3494 err
= mddev
->pers
->check_reshape(mddev
);
3496 mddev
->new_layout
= mddev
->layout
;
3500 mddev
->new_layout
= n
;
3501 if (mddev
->reshape_position
== MaxSector
)
3506 static struct md_sysfs_entry md_layout
=
3507 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3510 raid_disks_show(struct mddev
*mddev
, char *page
)
3512 if (mddev
->raid_disks
== 0)
3514 if (mddev
->reshape_position
!= MaxSector
&&
3515 mddev
->delta_disks
!= 0)
3516 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3517 mddev
->raid_disks
- mddev
->delta_disks
);
3518 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3521 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3524 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3528 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3530 if (!*buf
|| (*e
&& *e
!= '\n'))
3534 rv
= update_raid_disks(mddev
, n
);
3535 else if (mddev
->reshape_position
!= MaxSector
) {
3536 struct md_rdev
*rdev
;
3537 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3539 rdev_for_each(rdev
, mddev
) {
3541 rdev
->data_offset
< rdev
->new_data_offset
)
3544 rdev
->data_offset
> rdev
->new_data_offset
)
3547 mddev
->delta_disks
= n
- olddisks
;
3548 mddev
->raid_disks
= n
;
3549 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3551 mddev
->raid_disks
= n
;
3552 return rv
? rv
: len
;
3554 static struct md_sysfs_entry md_raid_disks
=
3555 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3558 chunk_size_show(struct mddev
*mddev
, char *page
)
3560 if (mddev
->reshape_position
!= MaxSector
&&
3561 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3562 return sprintf(page
, "%d (%d)\n",
3563 mddev
->new_chunk_sectors
<< 9,
3564 mddev
->chunk_sectors
<< 9);
3565 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3569 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3572 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3574 if (!*buf
|| (*e
&& *e
!= '\n'))
3579 if (mddev
->pers
->check_reshape
== NULL
)
3583 mddev
->new_chunk_sectors
= n
>> 9;
3584 err
= mddev
->pers
->check_reshape(mddev
);
3586 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3590 mddev
->new_chunk_sectors
= n
>> 9;
3591 if (mddev
->reshape_position
== MaxSector
)
3592 mddev
->chunk_sectors
= n
>> 9;
3596 static struct md_sysfs_entry md_chunk_size
=
3597 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3600 resync_start_show(struct mddev
*mddev
, char *page
)
3602 if (mddev
->recovery_cp
== MaxSector
)
3603 return sprintf(page
, "none\n");
3604 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3608 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3611 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3613 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3615 if (cmd_match(buf
, "none"))
3617 else if (!*buf
|| (*e
&& *e
!= '\n'))
3620 mddev
->recovery_cp
= n
;
3622 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3625 static struct md_sysfs_entry md_resync_start
=
3626 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3629 * The array state can be:
3632 * No devices, no size, no level
3633 * Equivalent to STOP_ARRAY ioctl
3635 * May have some settings, but array is not active
3636 * all IO results in error
3637 * When written, doesn't tear down array, but just stops it
3638 * suspended (not supported yet)
3639 * All IO requests will block. The array can be reconfigured.
3640 * Writing this, if accepted, will block until array is quiescent
3642 * no resync can happen. no superblocks get written.
3643 * write requests fail
3645 * like readonly, but behaves like 'clean' on a write request.
3647 * clean - no pending writes, but otherwise active.
3648 * When written to inactive array, starts without resync
3649 * If a write request arrives then
3650 * if metadata is known, mark 'dirty' and switch to 'active'.
3651 * if not known, block and switch to write-pending
3652 * If written to an active array that has pending writes, then fails.
3654 * fully active: IO and resync can be happening.
3655 * When written to inactive array, starts with resync
3658 * clean, but writes are blocked waiting for 'active' to be written.
3661 * like active, but no writes have been seen for a while (100msec).
3664 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3665 write_pending
, active_idle
, bad_word
};
3666 static char *array_states
[] = {
3667 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3668 "write-pending", "active-idle", NULL
};
3670 static int match_word(const char *word
, char **list
)
3673 for (n
=0; list
[n
]; n
++)
3674 if (cmd_match(word
, list
[n
]))
3680 array_state_show(struct mddev
*mddev
, char *page
)
3682 enum array_state st
= inactive
;
3695 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3697 else if (mddev
->safemode
)
3703 if (list_empty(&mddev
->disks
) &&
3704 mddev
->raid_disks
== 0 &&
3705 mddev
->dev_sectors
== 0)
3710 return sprintf(page
, "%s\n", array_states
[st
]);
3713 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3714 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3715 static int do_md_run(struct mddev
*mddev
);
3716 static int restart_array(struct mddev
*mddev
);
3719 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3722 enum array_state st
= match_word(buf
, array_states
);
3727 /* stopping an active array */
3728 err
= do_md_stop(mddev
, 0, NULL
);
3731 /* stopping an active array */
3733 err
= do_md_stop(mddev
, 2, NULL
);
3735 err
= 0; /* already inactive */
3738 break; /* not supported yet */
3741 err
= md_set_readonly(mddev
, NULL
);
3744 set_disk_ro(mddev
->gendisk
, 1);
3745 err
= do_md_run(mddev
);
3751 err
= md_set_readonly(mddev
, NULL
);
3752 else if (mddev
->ro
== 1)
3753 err
= restart_array(mddev
);
3756 set_disk_ro(mddev
->gendisk
, 0);
3760 err
= do_md_run(mddev
);
3765 restart_array(mddev
);
3766 spin_lock(&mddev
->lock
);
3767 if (atomic_read(&mddev
->writes_pending
) == 0) {
3768 if (mddev
->in_sync
== 0) {
3770 if (mddev
->safemode
== 1)
3771 mddev
->safemode
= 0;
3772 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3777 spin_unlock(&mddev
->lock
);
3783 restart_array(mddev
);
3784 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3785 wake_up(&mddev
->sb_wait
);
3789 set_disk_ro(mddev
->gendisk
, 0);
3790 err
= do_md_run(mddev
);
3795 /* these cannot be set */
3801 if (mddev
->hold_active
== UNTIL_IOCTL
)
3802 mddev
->hold_active
= 0;
3803 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3807 static struct md_sysfs_entry md_array_state
=
3808 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3811 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3812 return sprintf(page
, "%d\n",
3813 atomic_read(&mddev
->max_corr_read_errors
));
3817 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3820 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3822 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3823 atomic_set(&mddev
->max_corr_read_errors
, n
);
3829 static struct md_sysfs_entry max_corr_read_errors
=
3830 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3831 max_corrected_read_errors_store
);
3834 null_show(struct mddev
*mddev
, char *page
)
3840 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3842 /* buf must be %d:%d\n? giving major and minor numbers */
3843 /* The new device is added to the array.
3844 * If the array has a persistent superblock, we read the
3845 * superblock to initialise info and check validity.
3846 * Otherwise, only checking done is that in bind_rdev_to_array,
3847 * which mainly checks size.
3850 int major
= simple_strtoul(buf
, &e
, 10);
3853 struct md_rdev
*rdev
;
3856 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3858 minor
= simple_strtoul(e
+1, &e
, 10);
3859 if (*e
&& *e
!= '\n')
3861 dev
= MKDEV(major
, minor
);
3862 if (major
!= MAJOR(dev
) ||
3863 minor
!= MINOR(dev
))
3866 if (mddev
->persistent
) {
3867 rdev
= md_import_device(dev
, mddev
->major_version
,
3868 mddev
->minor_version
);
3869 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3870 struct md_rdev
*rdev0
3871 = list_entry(mddev
->disks
.next
,
3872 struct md_rdev
, same_set
);
3873 err
= super_types
[mddev
->major_version
]
3874 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3878 } else if (mddev
->external
)
3879 rdev
= md_import_device(dev
, -2, -1);
3881 rdev
= md_import_device(dev
, -1, -1);
3884 return PTR_ERR(rdev
);
3885 err
= bind_rdev_to_array(rdev
, mddev
);
3889 return err
? err
: len
;
3892 static struct md_sysfs_entry md_new_device
=
3893 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3896 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3899 unsigned long chunk
, end_chunk
;
3903 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3905 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3906 if (buf
== end
) break;
3907 if (*end
== '-') { /* range */
3909 end_chunk
= simple_strtoul(buf
, &end
, 0);
3910 if (buf
== end
) break;
3912 if (*end
&& !isspace(*end
)) break;
3913 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3914 buf
= skip_spaces(end
);
3916 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3921 static struct md_sysfs_entry md_bitmap
=
3922 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3925 size_show(struct mddev
*mddev
, char *page
)
3927 return sprintf(page
, "%llu\n",
3928 (unsigned long long)mddev
->dev_sectors
/ 2);
3931 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
3934 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3936 /* If array is inactive, we can reduce the component size, but
3937 * not increase it (except from 0).
3938 * If array is active, we can try an on-line resize
3941 int err
= strict_blocks_to_sectors(buf
, §ors
);
3946 err
= update_size(mddev
, sectors
);
3947 md_update_sb(mddev
, 1);
3949 if (mddev
->dev_sectors
== 0 ||
3950 mddev
->dev_sectors
> sectors
)
3951 mddev
->dev_sectors
= sectors
;
3955 return err
? err
: len
;
3958 static struct md_sysfs_entry md_size
=
3959 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3961 /* Metadata version.
3963 * 'none' for arrays with no metadata (good luck...)
3964 * 'external' for arrays with externally managed metadata,
3965 * or N.M for internally known formats
3968 metadata_show(struct mddev
*mddev
, char *page
)
3970 if (mddev
->persistent
)
3971 return sprintf(page
, "%d.%d\n",
3972 mddev
->major_version
, mddev
->minor_version
);
3973 else if (mddev
->external
)
3974 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3976 return sprintf(page
, "none\n");
3980 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3984 /* Changing the details of 'external' metadata is
3985 * always permitted. Otherwise there must be
3986 * no devices attached to the array.
3988 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3990 else if (!list_empty(&mddev
->disks
))
3993 if (cmd_match(buf
, "none")) {
3994 mddev
->persistent
= 0;
3995 mddev
->external
= 0;
3996 mddev
->major_version
= 0;
3997 mddev
->minor_version
= 90;
4000 if (strncmp(buf
, "external:", 9) == 0) {
4001 size_t namelen
= len
-9;
4002 if (namelen
>= sizeof(mddev
->metadata_type
))
4003 namelen
= sizeof(mddev
->metadata_type
)-1;
4004 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4005 mddev
->metadata_type
[namelen
] = 0;
4006 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4007 mddev
->metadata_type
[--namelen
] = 0;
4008 mddev
->persistent
= 0;
4009 mddev
->external
= 1;
4010 mddev
->major_version
= 0;
4011 mddev
->minor_version
= 90;
4014 major
= simple_strtoul(buf
, &e
, 10);
4015 if (e
==buf
|| *e
!= '.')
4018 minor
= simple_strtoul(buf
, &e
, 10);
4019 if (e
==buf
|| (*e
&& *e
!= '\n') )
4021 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4023 mddev
->major_version
= major
;
4024 mddev
->minor_version
= minor
;
4025 mddev
->persistent
= 1;
4026 mddev
->external
= 0;
4030 static struct md_sysfs_entry md_metadata
=
4031 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4034 action_show(struct mddev
*mddev
, char *page
)
4036 char *type
= "idle";
4037 unsigned long recovery
= mddev
->recovery
;
4038 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4040 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4041 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4042 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4044 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4045 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4047 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4051 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4054 return sprintf(page
, "%s\n", type
);
4058 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4060 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4063 if (cmd_match(page
, "frozen"))
4064 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4066 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4068 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4069 flush_workqueue(md_misc_wq
);
4070 if (mddev
->sync_thread
) {
4071 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4072 md_reap_sync_thread(mddev
);
4074 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4075 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4077 else if (cmd_match(page
, "resync"))
4078 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4079 else if (cmd_match(page
, "recover")) {
4080 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4081 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4082 } else if (cmd_match(page
, "reshape")) {
4084 if (mddev
->pers
->start_reshape
== NULL
)
4086 err
= mddev
->pers
->start_reshape(mddev
);
4089 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4091 if (cmd_match(page
, "check"))
4092 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4093 else if (!cmd_match(page
, "repair"))
4095 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4096 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4098 if (mddev
->ro
== 2) {
4099 /* A write to sync_action is enough to justify
4100 * canceling read-auto mode
4103 md_wakeup_thread(mddev
->sync_thread
);
4105 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4106 md_wakeup_thread(mddev
->thread
);
4107 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4111 static struct md_sysfs_entry md_scan_mode
=
4112 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4115 last_sync_action_show(struct mddev
*mddev
, char *page
)
4117 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4120 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4123 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4125 return sprintf(page
, "%llu\n",
4126 (unsigned long long)
4127 atomic64_read(&mddev
->resync_mismatches
));
4130 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4133 sync_min_show(struct mddev
*mddev
, char *page
)
4135 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4136 mddev
->sync_speed_min
? "local": "system");
4140 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4144 if (strncmp(buf
, "system", 6)==0) {
4145 mddev
->sync_speed_min
= 0;
4148 min
= simple_strtoul(buf
, &e
, 10);
4149 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4151 mddev
->sync_speed_min
= min
;
4155 static struct md_sysfs_entry md_sync_min
=
4156 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4159 sync_max_show(struct mddev
*mddev
, char *page
)
4161 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4162 mddev
->sync_speed_max
? "local": "system");
4166 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4170 if (strncmp(buf
, "system", 6)==0) {
4171 mddev
->sync_speed_max
= 0;
4174 max
= simple_strtoul(buf
, &e
, 10);
4175 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4177 mddev
->sync_speed_max
= max
;
4181 static struct md_sysfs_entry md_sync_max
=
4182 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4185 degraded_show(struct mddev
*mddev
, char *page
)
4187 return sprintf(page
, "%d\n", mddev
->degraded
);
4189 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4192 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4194 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4198 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4202 if (kstrtol(buf
, 10, &n
))
4205 if (n
!= 0 && n
!= 1)
4208 mddev
->parallel_resync
= n
;
4210 if (mddev
->sync_thread
)
4211 wake_up(&resync_wait
);
4216 /* force parallel resync, even with shared block devices */
4217 static struct md_sysfs_entry md_sync_force_parallel
=
4218 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4219 sync_force_parallel_show
, sync_force_parallel_store
);
4222 sync_speed_show(struct mddev
*mddev
, char *page
)
4224 unsigned long resync
, dt
, db
;
4225 if (mddev
->curr_resync
== 0)
4226 return sprintf(page
, "none\n");
4227 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4228 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4230 db
= resync
- mddev
->resync_mark_cnt
;
4231 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4234 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4237 sync_completed_show(struct mddev
*mddev
, char *page
)
4239 unsigned long long max_sectors
, resync
;
4241 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4242 return sprintf(page
, "none\n");
4244 if (mddev
->curr_resync
== 1 ||
4245 mddev
->curr_resync
== 2)
4246 return sprintf(page
, "delayed\n");
4248 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4249 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4250 max_sectors
= mddev
->resync_max_sectors
;
4252 max_sectors
= mddev
->dev_sectors
;
4254 resync
= mddev
->curr_resync_completed
;
4255 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4258 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4261 min_sync_show(struct mddev
*mddev
, char *page
)
4263 return sprintf(page
, "%llu\n",
4264 (unsigned long long)mddev
->resync_min
);
4267 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4269 unsigned long long min
;
4270 if (kstrtoull(buf
, 10, &min
))
4272 if (min
> mddev
->resync_max
)
4274 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4277 /* Must be a multiple of chunk_size */
4278 if (mddev
->chunk_sectors
) {
4279 sector_t temp
= min
;
4280 if (sector_div(temp
, mddev
->chunk_sectors
))
4283 mddev
->resync_min
= min
;
4288 static struct md_sysfs_entry md_min_sync
=
4289 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4292 max_sync_show(struct mddev
*mddev
, char *page
)
4294 if (mddev
->resync_max
== MaxSector
)
4295 return sprintf(page
, "max\n");
4297 return sprintf(page
, "%llu\n",
4298 (unsigned long long)mddev
->resync_max
);
4301 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4303 if (strncmp(buf
, "max", 3) == 0)
4304 mddev
->resync_max
= MaxSector
;
4306 unsigned long long max
;
4307 if (kstrtoull(buf
, 10, &max
))
4309 if (max
< mddev
->resync_min
)
4311 if (max
< mddev
->resync_max
&&
4313 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4316 /* Must be a multiple of chunk_size */
4317 if (mddev
->chunk_sectors
) {
4318 sector_t temp
= max
;
4319 if (sector_div(temp
, mddev
->chunk_sectors
))
4322 mddev
->resync_max
= max
;
4324 wake_up(&mddev
->recovery_wait
);
4328 static struct md_sysfs_entry md_max_sync
=
4329 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4332 suspend_lo_show(struct mddev
*mddev
, char *page
)
4334 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4338 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4341 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4342 unsigned long long old
= mddev
->suspend_lo
;
4344 if (mddev
->pers
== NULL
||
4345 mddev
->pers
->quiesce
== NULL
)
4347 if (buf
== e
|| (*e
&& *e
!= '\n'))
4350 mddev
->suspend_lo
= new;
4352 /* Shrinking suspended region */
4353 mddev
->pers
->quiesce(mddev
, 2);
4355 /* Expanding suspended region - need to wait */
4356 mddev
->pers
->quiesce(mddev
, 1);
4357 mddev
->pers
->quiesce(mddev
, 0);
4361 static struct md_sysfs_entry md_suspend_lo
=
4362 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4365 suspend_hi_show(struct mddev
*mddev
, char *page
)
4367 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4371 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4374 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4375 unsigned long long old
= mddev
->suspend_hi
;
4377 if (mddev
->pers
== NULL
||
4378 mddev
->pers
->quiesce
== NULL
)
4380 if (buf
== e
|| (*e
&& *e
!= '\n'))
4383 mddev
->suspend_hi
= new;
4385 /* Shrinking suspended region */
4386 mddev
->pers
->quiesce(mddev
, 2);
4388 /* Expanding suspended region - need to wait */
4389 mddev
->pers
->quiesce(mddev
, 1);
4390 mddev
->pers
->quiesce(mddev
, 0);
4394 static struct md_sysfs_entry md_suspend_hi
=
4395 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4398 reshape_position_show(struct mddev
*mddev
, char *page
)
4400 if (mddev
->reshape_position
!= MaxSector
)
4401 return sprintf(page
, "%llu\n",
4402 (unsigned long long)mddev
->reshape_position
);
4403 strcpy(page
, "none\n");
4408 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4410 struct md_rdev
*rdev
;
4412 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4415 if (buf
== e
|| (*e
&& *e
!= '\n'))
4417 mddev
->reshape_position
= new;
4418 mddev
->delta_disks
= 0;
4419 mddev
->reshape_backwards
= 0;
4420 mddev
->new_level
= mddev
->level
;
4421 mddev
->new_layout
= mddev
->layout
;
4422 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4423 rdev_for_each(rdev
, mddev
)
4424 rdev
->new_data_offset
= rdev
->data_offset
;
4428 static struct md_sysfs_entry md_reshape_position
=
4429 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4430 reshape_position_store
);
4433 reshape_direction_show(struct mddev
*mddev
, char *page
)
4435 return sprintf(page
, "%s\n",
4436 mddev
->reshape_backwards
? "backwards" : "forwards");
4440 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4443 if (cmd_match(buf
, "forwards"))
4445 else if (cmd_match(buf
, "backwards"))
4449 if (mddev
->reshape_backwards
== backwards
)
4452 /* check if we are allowed to change */
4453 if (mddev
->delta_disks
)
4456 if (mddev
->persistent
&&
4457 mddev
->major_version
== 0)
4460 mddev
->reshape_backwards
= backwards
;
4464 static struct md_sysfs_entry md_reshape_direction
=
4465 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4466 reshape_direction_store
);
4469 array_size_show(struct mddev
*mddev
, char *page
)
4471 if (mddev
->external_size
)
4472 return sprintf(page
, "%llu\n",
4473 (unsigned long long)mddev
->array_sectors
/2);
4475 return sprintf(page
, "default\n");
4479 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4483 if (strncmp(buf
, "default", 7) == 0) {
4485 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4487 sectors
= mddev
->array_sectors
;
4489 mddev
->external_size
= 0;
4491 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4493 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4496 mddev
->external_size
= 1;
4499 mddev
->array_sectors
= sectors
;
4501 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4502 revalidate_disk(mddev
->gendisk
);
4507 static struct md_sysfs_entry md_array_size
=
4508 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4511 static struct attribute
*md_default_attrs
[] = {
4514 &md_raid_disks
.attr
,
4515 &md_chunk_size
.attr
,
4517 &md_resync_start
.attr
,
4519 &md_new_device
.attr
,
4520 &md_safe_delay
.attr
,
4521 &md_array_state
.attr
,
4522 &md_reshape_position
.attr
,
4523 &md_reshape_direction
.attr
,
4524 &md_array_size
.attr
,
4525 &max_corr_read_errors
.attr
,
4529 static struct attribute
*md_redundancy_attrs
[] = {
4531 &md_last_scan_mode
.attr
,
4532 &md_mismatches
.attr
,
4535 &md_sync_speed
.attr
,
4536 &md_sync_force_parallel
.attr
,
4537 &md_sync_completed
.attr
,
4540 &md_suspend_lo
.attr
,
4541 &md_suspend_hi
.attr
,
4546 static struct attribute_group md_redundancy_group
= {
4548 .attrs
= md_redundancy_attrs
,
4552 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4554 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4555 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4560 spin_lock(&all_mddevs_lock
);
4561 if (list_empty(&mddev
->all_mddevs
)) {
4562 spin_unlock(&all_mddevs_lock
);
4566 spin_unlock(&all_mddevs_lock
);
4568 rv
= entry
->show(mddev
, page
);
4574 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4575 const char *page
, size_t length
)
4577 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4578 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4583 if (!capable(CAP_SYS_ADMIN
))
4585 spin_lock(&all_mddevs_lock
);
4586 if (list_empty(&mddev
->all_mddevs
)) {
4587 spin_unlock(&all_mddevs_lock
);
4591 spin_unlock(&all_mddevs_lock
);
4592 if (entry
->store
== new_dev_store
)
4593 flush_workqueue(md_misc_wq
);
4594 rv
= mddev_lock(mddev
);
4596 rv
= entry
->store(mddev
, page
, length
);
4597 mddev_unlock(mddev
);
4603 static void md_free(struct kobject
*ko
)
4605 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4607 if (mddev
->sysfs_state
)
4608 sysfs_put(mddev
->sysfs_state
);
4610 if (mddev
->gendisk
) {
4611 del_gendisk(mddev
->gendisk
);
4612 put_disk(mddev
->gendisk
);
4615 blk_cleanup_queue(mddev
->queue
);
4620 static const struct sysfs_ops md_sysfs_ops
= {
4621 .show
= md_attr_show
,
4622 .store
= md_attr_store
,
4624 static struct kobj_type md_ktype
= {
4626 .sysfs_ops
= &md_sysfs_ops
,
4627 .default_attrs
= md_default_attrs
,
4632 static void mddev_delayed_delete(struct work_struct
*ws
)
4634 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4636 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4637 kobject_del(&mddev
->kobj
);
4638 kobject_put(&mddev
->kobj
);
4641 static int md_alloc(dev_t dev
, char *name
)
4643 static DEFINE_MUTEX(disks_mutex
);
4644 struct mddev
*mddev
= mddev_find(dev
);
4645 struct gendisk
*disk
;
4654 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4655 shift
= partitioned
? MdpMinorShift
: 0;
4656 unit
= MINOR(mddev
->unit
) >> shift
;
4658 /* wait for any previous instance of this device to be
4659 * completely removed (mddev_delayed_delete).
4661 flush_workqueue(md_misc_wq
);
4663 mutex_lock(&disks_mutex
);
4669 /* Need to ensure that 'name' is not a duplicate.
4671 struct mddev
*mddev2
;
4672 spin_lock(&all_mddevs_lock
);
4674 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4675 if (mddev2
->gendisk
&&
4676 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4677 spin_unlock(&all_mddevs_lock
);
4680 spin_unlock(&all_mddevs_lock
);
4684 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4687 mddev
->queue
->queuedata
= mddev
;
4689 blk_queue_make_request(mddev
->queue
, md_make_request
);
4690 blk_set_stacking_limits(&mddev
->queue
->limits
);
4692 disk
= alloc_disk(1 << shift
);
4694 blk_cleanup_queue(mddev
->queue
);
4695 mddev
->queue
= NULL
;
4698 disk
->major
= MAJOR(mddev
->unit
);
4699 disk
->first_minor
= unit
<< shift
;
4701 strcpy(disk
->disk_name
, name
);
4702 else if (partitioned
)
4703 sprintf(disk
->disk_name
, "md_d%d", unit
);
4705 sprintf(disk
->disk_name
, "md%d", unit
);
4706 disk
->fops
= &md_fops
;
4707 disk
->private_data
= mddev
;
4708 disk
->queue
= mddev
->queue
;
4709 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4710 /* Allow extended partitions. This makes the
4711 * 'mdp' device redundant, but we can't really
4714 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4715 mddev
->gendisk
= disk
;
4716 /* As soon as we call add_disk(), another thread could get
4717 * through to md_open, so make sure it doesn't get too far
4719 mutex_lock(&mddev
->open_mutex
);
4722 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4723 &disk_to_dev(disk
)->kobj
, "%s", "md");
4725 /* This isn't possible, but as kobject_init_and_add is marked
4726 * __must_check, we must do something with the result
4728 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4732 if (mddev
->kobj
.sd
&&
4733 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4734 printk(KERN_DEBUG
"pointless warning\n");
4735 mutex_unlock(&mddev
->open_mutex
);
4737 mutex_unlock(&disks_mutex
);
4738 if (!error
&& mddev
->kobj
.sd
) {
4739 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4740 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4746 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4748 md_alloc(dev
, NULL
);
4752 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4754 /* val must be "md_*" where * is not all digits.
4755 * We allocate an array with a large free minor number, and
4756 * set the name to val. val must not already be an active name.
4758 int len
= strlen(val
);
4759 char buf
[DISK_NAME_LEN
];
4761 while (len
&& val
[len
-1] == '\n')
4763 if (len
>= DISK_NAME_LEN
)
4765 strlcpy(buf
, val
, len
+1);
4766 if (strncmp(buf
, "md_", 3) != 0)
4768 return md_alloc(0, buf
);
4771 static void md_safemode_timeout(unsigned long data
)
4773 struct mddev
*mddev
= (struct mddev
*) data
;
4775 if (!atomic_read(&mddev
->writes_pending
)) {
4776 mddev
->safemode
= 1;
4777 if (mddev
->external
)
4778 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4780 md_wakeup_thread(mddev
->thread
);
4783 static int start_dirty_degraded
;
4785 int md_run(struct mddev
*mddev
)
4788 struct md_rdev
*rdev
;
4789 struct md_personality
*pers
;
4791 if (list_empty(&mddev
->disks
))
4792 /* cannot run an array with no devices.. */
4797 /* Cannot run until previous stop completes properly */
4798 if (mddev
->sysfs_active
)
4802 * Analyze all RAID superblock(s)
4804 if (!mddev
->raid_disks
) {
4805 if (!mddev
->persistent
)
4810 if (mddev
->level
!= LEVEL_NONE
)
4811 request_module("md-level-%d", mddev
->level
);
4812 else if (mddev
->clevel
[0])
4813 request_module("md-%s", mddev
->clevel
);
4816 * Drop all container device buffers, from now on
4817 * the only valid external interface is through the md
4820 rdev_for_each(rdev
, mddev
) {
4821 if (test_bit(Faulty
, &rdev
->flags
))
4823 sync_blockdev(rdev
->bdev
);
4824 invalidate_bdev(rdev
->bdev
);
4826 /* perform some consistency tests on the device.
4827 * We don't want the data to overlap the metadata,
4828 * Internal Bitmap issues have been handled elsewhere.
4830 if (rdev
->meta_bdev
) {
4831 /* Nothing to check */;
4832 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4833 if (mddev
->dev_sectors
&&
4834 rdev
->data_offset
+ mddev
->dev_sectors
4836 printk("md: %s: data overlaps metadata\n",
4841 if (rdev
->sb_start
+ rdev
->sb_size
/512
4842 > rdev
->data_offset
) {
4843 printk("md: %s: metadata overlaps data\n",
4848 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4851 if (mddev
->bio_set
== NULL
)
4852 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
4854 spin_lock(&pers_lock
);
4855 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4856 if (!pers
|| !try_module_get(pers
->owner
)) {
4857 spin_unlock(&pers_lock
);
4858 if (mddev
->level
!= LEVEL_NONE
)
4859 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4862 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4866 spin_unlock(&pers_lock
);
4867 if (mddev
->level
!= pers
->level
) {
4868 mddev
->level
= pers
->level
;
4869 mddev
->new_level
= pers
->level
;
4871 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4873 if (mddev
->reshape_position
!= MaxSector
&&
4874 pers
->start_reshape
== NULL
) {
4875 /* This personality cannot handle reshaping... */
4876 module_put(pers
->owner
);
4880 if (pers
->sync_request
) {
4881 /* Warn if this is a potentially silly
4884 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4885 struct md_rdev
*rdev2
;
4888 rdev_for_each(rdev
, mddev
)
4889 rdev_for_each(rdev2
, mddev
) {
4891 rdev
->bdev
->bd_contains
==
4892 rdev2
->bdev
->bd_contains
) {
4894 "%s: WARNING: %s appears to be"
4895 " on the same physical disk as"
4898 bdevname(rdev
->bdev
,b
),
4899 bdevname(rdev2
->bdev
,b2
));
4906 "True protection against single-disk"
4907 " failure might be compromised.\n");
4910 mddev
->recovery
= 0;
4911 /* may be over-ridden by personality */
4912 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4914 mddev
->ok_start_degraded
= start_dirty_degraded
;
4916 if (start_readonly
&& mddev
->ro
== 0)
4917 mddev
->ro
= 2; /* read-only, but switch on first write */
4919 err
= pers
->run(mddev
);
4921 printk(KERN_ERR
"md: pers->run() failed ...\n");
4922 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4923 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4924 " but 'external_size' not in effect?\n", __func__
);
4926 "md: invalid array_size %llu > default size %llu\n",
4927 (unsigned long long)mddev
->array_sectors
/ 2,
4928 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
4931 if (err
== 0 && pers
->sync_request
&&
4932 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
4933 err
= bitmap_create(mddev
);
4935 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4936 mdname(mddev
), err
);
4939 mddev_detach(mddev
);
4940 pers
->free(mddev
, mddev
->private);
4941 module_put(pers
->owner
);
4942 bitmap_destroy(mddev
);
4946 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
4947 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
4948 blk_queue_merge_bvec(mddev
->queue
, md_mergeable_bvec
);
4950 if (pers
->sync_request
) {
4951 if (mddev
->kobj
.sd
&&
4952 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4954 "md: cannot register extra attributes for %s\n",
4956 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4957 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4960 atomic_set(&mddev
->writes_pending
,0);
4961 atomic_set(&mddev
->max_corr_read_errors
,
4962 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4963 mddev
->safemode
= 0;
4964 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4965 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4966 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4969 spin_lock(&mddev
->lock
);
4972 spin_unlock(&mddev
->lock
);
4973 rdev_for_each(rdev
, mddev
)
4974 if (rdev
->raid_disk
>= 0)
4975 if (sysfs_link_rdev(mddev
, rdev
))
4976 /* failure here is OK */;
4978 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4980 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
4981 md_update_sb(mddev
, 0);
4983 md_new_event(mddev
);
4984 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4985 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4986 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4989 EXPORT_SYMBOL_GPL(md_run
);
4991 static int do_md_run(struct mddev
*mddev
)
4995 err
= md_run(mddev
);
4998 err
= bitmap_load(mddev
);
5000 bitmap_destroy(mddev
);
5004 md_wakeup_thread(mddev
->thread
);
5005 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5007 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5008 revalidate_disk(mddev
->gendisk
);
5010 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5015 static int restart_array(struct mddev
*mddev
)
5017 struct gendisk
*disk
= mddev
->gendisk
;
5019 /* Complain if it has no devices */
5020 if (list_empty(&mddev
->disks
))
5026 mddev
->safemode
= 0;
5028 set_disk_ro(disk
, 0);
5029 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5031 /* Kick recovery or resync if necessary */
5032 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5033 md_wakeup_thread(mddev
->thread
);
5034 md_wakeup_thread(mddev
->sync_thread
);
5035 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5039 static void md_clean(struct mddev
*mddev
)
5041 mddev
->array_sectors
= 0;
5042 mddev
->external_size
= 0;
5043 mddev
->dev_sectors
= 0;
5044 mddev
->raid_disks
= 0;
5045 mddev
->recovery_cp
= 0;
5046 mddev
->resync_min
= 0;
5047 mddev
->resync_max
= MaxSector
;
5048 mddev
->reshape_position
= MaxSector
;
5049 mddev
->external
= 0;
5050 mddev
->persistent
= 0;
5051 mddev
->level
= LEVEL_NONE
;
5052 mddev
->clevel
[0] = 0;
5055 mddev
->metadata_type
[0] = 0;
5056 mddev
->chunk_sectors
= 0;
5057 mddev
->ctime
= mddev
->utime
= 0;
5059 mddev
->max_disks
= 0;
5061 mddev
->can_decrease_events
= 0;
5062 mddev
->delta_disks
= 0;
5063 mddev
->reshape_backwards
= 0;
5064 mddev
->new_level
= LEVEL_NONE
;
5065 mddev
->new_layout
= 0;
5066 mddev
->new_chunk_sectors
= 0;
5067 mddev
->curr_resync
= 0;
5068 atomic64_set(&mddev
->resync_mismatches
, 0);
5069 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5070 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5071 mddev
->recovery
= 0;
5074 mddev
->degraded
= 0;
5075 mddev
->safemode
= 0;
5076 mddev
->merge_check_needed
= 0;
5077 mddev
->bitmap_info
.offset
= 0;
5078 mddev
->bitmap_info
.default_offset
= 0;
5079 mddev
->bitmap_info
.default_space
= 0;
5080 mddev
->bitmap_info
.chunksize
= 0;
5081 mddev
->bitmap_info
.daemon_sleep
= 0;
5082 mddev
->bitmap_info
.max_write_behind
= 0;
5085 static void __md_stop_writes(struct mddev
*mddev
)
5087 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5088 flush_workqueue(md_misc_wq
);
5089 if (mddev
->sync_thread
) {
5090 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5091 md_reap_sync_thread(mddev
);
5094 del_timer_sync(&mddev
->safemode_timer
);
5096 bitmap_flush(mddev
);
5097 md_super_wait(mddev
);
5099 if (mddev
->ro
== 0 &&
5100 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5101 /* mark array as shutdown cleanly */
5103 md_update_sb(mddev
, 1);
5107 void md_stop_writes(struct mddev
*mddev
)
5109 mddev_lock_nointr(mddev
);
5110 __md_stop_writes(mddev
);
5111 mddev_unlock(mddev
);
5113 EXPORT_SYMBOL_GPL(md_stop_writes
);
5115 static void mddev_detach(struct mddev
*mddev
)
5117 struct bitmap
*bitmap
= mddev
->bitmap
;
5118 /* wait for behind writes to complete */
5119 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5120 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5122 /* need to kick something here to make sure I/O goes? */
5123 wait_event(bitmap
->behind_wait
,
5124 atomic_read(&bitmap
->behind_writes
) == 0);
5126 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5127 mddev
->pers
->quiesce(mddev
, 1);
5128 mddev
->pers
->quiesce(mddev
, 0);
5130 md_unregister_thread(&mddev
->thread
);
5132 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5135 static void __md_stop(struct mddev
*mddev
)
5137 struct md_personality
*pers
= mddev
->pers
;
5138 mddev_detach(mddev
);
5139 spin_lock(&mddev
->lock
);
5142 spin_unlock(&mddev
->lock
);
5143 pers
->free(mddev
, mddev
->private);
5144 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5145 mddev
->to_remove
= &md_redundancy_group
;
5146 module_put(pers
->owner
);
5147 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5150 void md_stop(struct mddev
*mddev
)
5152 /* stop the array and free an attached data structures.
5153 * This is called from dm-raid
5156 bitmap_destroy(mddev
);
5158 bioset_free(mddev
->bio_set
);
5161 EXPORT_SYMBOL_GPL(md_stop
);
5163 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5168 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5170 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5171 md_wakeup_thread(mddev
->thread
);
5173 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5174 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5175 if (mddev
->sync_thread
)
5176 /* Thread might be blocked waiting for metadata update
5177 * which will now never happen */
5178 wake_up_process(mddev
->sync_thread
->tsk
);
5180 mddev_unlock(mddev
);
5181 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5183 mddev_lock_nointr(mddev
);
5185 mutex_lock(&mddev
->open_mutex
);
5186 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5187 mddev
->sync_thread
||
5188 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5189 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5190 printk("md: %s still in use.\n",mdname(mddev
));
5192 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5193 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5194 md_wakeup_thread(mddev
->thread
);
5200 __md_stop_writes(mddev
);
5206 set_disk_ro(mddev
->gendisk
, 1);
5207 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5208 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5209 md_wakeup_thread(mddev
->thread
);
5210 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5214 mutex_unlock(&mddev
->open_mutex
);
5219 * 0 - completely stop and dis-assemble array
5220 * 2 - stop but do not disassemble array
5222 static int do_md_stop(struct mddev
*mddev
, int mode
,
5223 struct block_device
*bdev
)
5225 struct gendisk
*disk
= mddev
->gendisk
;
5226 struct md_rdev
*rdev
;
5229 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5231 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5232 md_wakeup_thread(mddev
->thread
);
5234 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5235 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5236 if (mddev
->sync_thread
)
5237 /* Thread might be blocked waiting for metadata update
5238 * which will now never happen */
5239 wake_up_process(mddev
->sync_thread
->tsk
);
5241 mddev_unlock(mddev
);
5242 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5243 !test_bit(MD_RECOVERY_RUNNING
,
5244 &mddev
->recovery
)));
5245 mddev_lock_nointr(mddev
);
5247 mutex_lock(&mddev
->open_mutex
);
5248 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5249 mddev
->sysfs_active
||
5250 mddev
->sync_thread
||
5251 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5252 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5253 printk("md: %s still in use.\n",mdname(mddev
));
5254 mutex_unlock(&mddev
->open_mutex
);
5256 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5257 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5258 md_wakeup_thread(mddev
->thread
);
5264 set_disk_ro(disk
, 0);
5266 __md_stop_writes(mddev
);
5268 mddev
->queue
->merge_bvec_fn
= NULL
;
5269 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5271 /* tell userspace to handle 'inactive' */
5272 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5274 rdev_for_each(rdev
, mddev
)
5275 if (rdev
->raid_disk
>= 0)
5276 sysfs_unlink_rdev(mddev
, rdev
);
5278 set_capacity(disk
, 0);
5279 mutex_unlock(&mddev
->open_mutex
);
5281 revalidate_disk(disk
);
5286 mutex_unlock(&mddev
->open_mutex
);
5288 * Free resources if final stop
5291 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5293 bitmap_destroy(mddev
);
5294 if (mddev
->bitmap_info
.file
) {
5295 fput(mddev
->bitmap_info
.file
);
5296 mddev
->bitmap_info
.file
= NULL
;
5298 mddev
->bitmap_info
.offset
= 0;
5300 export_array(mddev
);
5303 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5304 if (mddev
->hold_active
== UNTIL_STOP
)
5305 mddev
->hold_active
= 0;
5307 blk_integrity_unregister(disk
);
5308 md_new_event(mddev
);
5309 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5314 static void autorun_array(struct mddev
*mddev
)
5316 struct md_rdev
*rdev
;
5319 if (list_empty(&mddev
->disks
))
5322 printk(KERN_INFO
"md: running: ");
5324 rdev_for_each(rdev
, mddev
) {
5325 char b
[BDEVNAME_SIZE
];
5326 printk("<%s>", bdevname(rdev
->bdev
,b
));
5330 err
= do_md_run(mddev
);
5332 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5333 do_md_stop(mddev
, 0, NULL
);
5338 * lets try to run arrays based on all disks that have arrived
5339 * until now. (those are in pending_raid_disks)
5341 * the method: pick the first pending disk, collect all disks with
5342 * the same UUID, remove all from the pending list and put them into
5343 * the 'same_array' list. Then order this list based on superblock
5344 * update time (freshest comes first), kick out 'old' disks and
5345 * compare superblocks. If everything's fine then run it.
5347 * If "unit" is allocated, then bump its reference count
5349 static void autorun_devices(int part
)
5351 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5352 struct mddev
*mddev
;
5353 char b
[BDEVNAME_SIZE
];
5355 printk(KERN_INFO
"md: autorun ...\n");
5356 while (!list_empty(&pending_raid_disks
)) {
5359 LIST_HEAD(candidates
);
5360 rdev0
= list_entry(pending_raid_disks
.next
,
5361 struct md_rdev
, same_set
);
5363 printk(KERN_INFO
"md: considering %s ...\n",
5364 bdevname(rdev0
->bdev
,b
));
5365 INIT_LIST_HEAD(&candidates
);
5366 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5367 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5368 printk(KERN_INFO
"md: adding %s ...\n",
5369 bdevname(rdev
->bdev
,b
));
5370 list_move(&rdev
->same_set
, &candidates
);
5373 * now we have a set of devices, with all of them having
5374 * mostly sane superblocks. It's time to allocate the
5378 dev
= MKDEV(mdp_major
,
5379 rdev0
->preferred_minor
<< MdpMinorShift
);
5380 unit
= MINOR(dev
) >> MdpMinorShift
;
5382 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5385 if (rdev0
->preferred_minor
!= unit
) {
5386 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5387 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5391 md_probe(dev
, NULL
, NULL
);
5392 mddev
= mddev_find(dev
);
5393 if (!mddev
|| !mddev
->gendisk
) {
5397 "md: cannot allocate memory for md drive.\n");
5400 if (mddev_lock(mddev
))
5401 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5403 else if (mddev
->raid_disks
|| mddev
->major_version
5404 || !list_empty(&mddev
->disks
)) {
5406 "md: %s already running, cannot run %s\n",
5407 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5408 mddev_unlock(mddev
);
5410 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5411 mddev
->persistent
= 1;
5412 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5413 list_del_init(&rdev
->same_set
);
5414 if (bind_rdev_to_array(rdev
, mddev
))
5417 autorun_array(mddev
);
5418 mddev_unlock(mddev
);
5420 /* on success, candidates will be empty, on error
5423 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5424 list_del_init(&rdev
->same_set
);
5429 printk(KERN_INFO
"md: ... autorun DONE.\n");
5431 #endif /* !MODULE */
5433 static int get_version(void __user
*arg
)
5437 ver
.major
= MD_MAJOR_VERSION
;
5438 ver
.minor
= MD_MINOR_VERSION
;
5439 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5441 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5447 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5449 mdu_array_info_t info
;
5450 int nr
,working
,insync
,failed
,spare
;
5451 struct md_rdev
*rdev
;
5453 nr
= working
= insync
= failed
= spare
= 0;
5455 rdev_for_each_rcu(rdev
, mddev
) {
5457 if (test_bit(Faulty
, &rdev
->flags
))
5461 if (test_bit(In_sync
, &rdev
->flags
))
5469 info
.major_version
= mddev
->major_version
;
5470 info
.minor_version
= mddev
->minor_version
;
5471 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5472 info
.ctime
= mddev
->ctime
;
5473 info
.level
= mddev
->level
;
5474 info
.size
= mddev
->dev_sectors
/ 2;
5475 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5478 info
.raid_disks
= mddev
->raid_disks
;
5479 info
.md_minor
= mddev
->md_minor
;
5480 info
.not_persistent
= !mddev
->persistent
;
5482 info
.utime
= mddev
->utime
;
5485 info
.state
= (1<<MD_SB_CLEAN
);
5486 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5487 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5488 info
.active_disks
= insync
;
5489 info
.working_disks
= working
;
5490 info
.failed_disks
= failed
;
5491 info
.spare_disks
= spare
;
5493 info
.layout
= mddev
->layout
;
5494 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5496 if (copy_to_user(arg
, &info
, sizeof(info
)))
5502 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5504 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5508 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5513 /* bitmap disabled, zero the first byte and copy out */
5514 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5515 file
->pathname
[0] = '\0';
5519 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5520 file
->pathname
, sizeof(file
->pathname
));
5524 memmove(file
->pathname
, ptr
,
5525 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5529 if (copy_to_user(arg
, file
, sizeof(*file
)))
5536 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5538 mdu_disk_info_t info
;
5539 struct md_rdev
*rdev
;
5541 if (copy_from_user(&info
, arg
, sizeof(info
)))
5545 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5547 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5548 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5549 info
.raid_disk
= rdev
->raid_disk
;
5551 if (test_bit(Faulty
, &rdev
->flags
))
5552 info
.state
|= (1<<MD_DISK_FAULTY
);
5553 else if (test_bit(In_sync
, &rdev
->flags
)) {
5554 info
.state
|= (1<<MD_DISK_ACTIVE
);
5555 info
.state
|= (1<<MD_DISK_SYNC
);
5557 if (test_bit(WriteMostly
, &rdev
->flags
))
5558 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5560 info
.major
= info
.minor
= 0;
5561 info
.raid_disk
= -1;
5562 info
.state
= (1<<MD_DISK_REMOVED
);
5566 if (copy_to_user(arg
, &info
, sizeof(info
)))
5572 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5574 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5575 struct md_rdev
*rdev
;
5576 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5578 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5581 if (!mddev
->raid_disks
) {
5583 /* expecting a device which has a superblock */
5584 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5587 "md: md_import_device returned %ld\n",
5589 return PTR_ERR(rdev
);
5591 if (!list_empty(&mddev
->disks
)) {
5592 struct md_rdev
*rdev0
5593 = list_entry(mddev
->disks
.next
,
5594 struct md_rdev
, same_set
);
5595 err
= super_types
[mddev
->major_version
]
5596 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5599 "md: %s has different UUID to %s\n",
5600 bdevname(rdev
->bdev
,b
),
5601 bdevname(rdev0
->bdev
,b2
));
5606 err
= bind_rdev_to_array(rdev
, mddev
);
5613 * add_new_disk can be used once the array is assembled
5614 * to add "hot spares". They must already have a superblock
5619 if (!mddev
->pers
->hot_add_disk
) {
5621 "%s: personality does not support diskops!\n",
5625 if (mddev
->persistent
)
5626 rdev
= md_import_device(dev
, mddev
->major_version
,
5627 mddev
->minor_version
);
5629 rdev
= md_import_device(dev
, -1, -1);
5632 "md: md_import_device returned %ld\n",
5634 return PTR_ERR(rdev
);
5636 /* set saved_raid_disk if appropriate */
5637 if (!mddev
->persistent
) {
5638 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5639 info
->raid_disk
< mddev
->raid_disks
) {
5640 rdev
->raid_disk
= info
->raid_disk
;
5641 set_bit(In_sync
, &rdev
->flags
);
5642 clear_bit(Bitmap_sync
, &rdev
->flags
);
5644 rdev
->raid_disk
= -1;
5645 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5647 super_types
[mddev
->major_version
].
5648 validate_super(mddev
, rdev
);
5649 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5650 rdev
->raid_disk
!= info
->raid_disk
) {
5651 /* This was a hot-add request, but events doesn't
5652 * match, so reject it.
5658 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5659 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5660 set_bit(WriteMostly
, &rdev
->flags
);
5662 clear_bit(WriteMostly
, &rdev
->flags
);
5664 rdev
->raid_disk
= -1;
5665 err
= bind_rdev_to_array(rdev
, mddev
);
5666 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5667 /* If there is hot_add_disk but no hot_remove_disk
5668 * then added disks for geometry changes,
5669 * and should be added immediately.
5671 super_types
[mddev
->major_version
].
5672 validate_super(mddev
, rdev
);
5673 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5675 unbind_rdev_from_array(rdev
);
5680 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5682 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5683 if (mddev
->degraded
)
5684 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5685 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5687 md_new_event(mddev
);
5688 md_wakeup_thread(mddev
->thread
);
5692 /* otherwise, add_new_disk is only allowed
5693 * for major_version==0 superblocks
5695 if (mddev
->major_version
!= 0) {
5696 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5701 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5703 rdev
= md_import_device(dev
, -1, 0);
5706 "md: error, md_import_device() returned %ld\n",
5708 return PTR_ERR(rdev
);
5710 rdev
->desc_nr
= info
->number
;
5711 if (info
->raid_disk
< mddev
->raid_disks
)
5712 rdev
->raid_disk
= info
->raid_disk
;
5714 rdev
->raid_disk
= -1;
5716 if (rdev
->raid_disk
< mddev
->raid_disks
)
5717 if (info
->state
& (1<<MD_DISK_SYNC
))
5718 set_bit(In_sync
, &rdev
->flags
);
5720 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5721 set_bit(WriteMostly
, &rdev
->flags
);
5723 if (!mddev
->persistent
) {
5724 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5725 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5727 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5728 rdev
->sectors
= rdev
->sb_start
;
5730 err
= bind_rdev_to_array(rdev
, mddev
);
5740 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5742 char b
[BDEVNAME_SIZE
];
5743 struct md_rdev
*rdev
;
5745 rdev
= find_rdev(mddev
, dev
);
5749 clear_bit(Blocked
, &rdev
->flags
);
5750 remove_and_add_spares(mddev
, rdev
);
5752 if (rdev
->raid_disk
>= 0)
5755 kick_rdev_from_array(rdev
);
5756 md_update_sb(mddev
, 1);
5757 md_new_event(mddev
);
5761 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5762 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5766 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5768 char b
[BDEVNAME_SIZE
];
5770 struct md_rdev
*rdev
;
5775 if (mddev
->major_version
!= 0) {
5776 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5777 " version-0 superblocks.\n",
5781 if (!mddev
->pers
->hot_add_disk
) {
5783 "%s: personality does not support diskops!\n",
5788 rdev
= md_import_device(dev
, -1, 0);
5791 "md: error, md_import_device() returned %ld\n",
5796 if (mddev
->persistent
)
5797 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5799 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5801 rdev
->sectors
= rdev
->sb_start
;
5803 if (test_bit(Faulty
, &rdev
->flags
)) {
5805 "md: can not hot-add faulty %s disk to %s!\n",
5806 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5810 clear_bit(In_sync
, &rdev
->flags
);
5812 rdev
->saved_raid_disk
= -1;
5813 err
= bind_rdev_to_array(rdev
, mddev
);
5818 * The rest should better be atomic, we can have disk failures
5819 * noticed in interrupt contexts ...
5822 rdev
->raid_disk
= -1;
5824 md_update_sb(mddev
, 1);
5827 * Kick recovery, maybe this spare has to be added to the
5828 * array immediately.
5830 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5831 md_wakeup_thread(mddev
->thread
);
5832 md_new_event(mddev
);
5840 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5845 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
5847 if (mddev
->recovery
|| mddev
->sync_thread
)
5849 /* we should be able to change the bitmap.. */
5853 struct inode
*inode
;
5856 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
5857 return -EEXIST
; /* cannot add when bitmap is present */
5861 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5866 inode
= f
->f_mapping
->host
;
5867 if (!S_ISREG(inode
->i_mode
)) {
5868 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
5871 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
5872 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
5875 } else if (atomic_read(&inode
->i_writecount
) != 1) {
5876 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5884 mddev
->bitmap_info
.file
= f
;
5885 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5886 } else if (mddev
->bitmap
== NULL
)
5887 return -ENOENT
; /* cannot remove what isn't there */
5890 mddev
->pers
->quiesce(mddev
, 1);
5892 err
= bitmap_create(mddev
);
5894 err
= bitmap_load(mddev
);
5896 if (fd
< 0 || err
) {
5897 bitmap_destroy(mddev
);
5898 fd
= -1; /* make sure to put the file */
5900 mddev
->pers
->quiesce(mddev
, 0);
5903 if (mddev
->bitmap_info
.file
)
5904 fput(mddev
->bitmap_info
.file
);
5905 mddev
->bitmap_info
.file
= NULL
;
5912 * set_array_info is used two different ways
5913 * The original usage is when creating a new array.
5914 * In this usage, raid_disks is > 0 and it together with
5915 * level, size, not_persistent,layout,chunksize determine the
5916 * shape of the array.
5917 * This will always create an array with a type-0.90.0 superblock.
5918 * The newer usage is when assembling an array.
5919 * In this case raid_disks will be 0, and the major_version field is
5920 * use to determine which style super-blocks are to be found on the devices.
5921 * The minor and patch _version numbers are also kept incase the
5922 * super_block handler wishes to interpret them.
5924 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
5927 if (info
->raid_disks
== 0) {
5928 /* just setting version number for superblock loading */
5929 if (info
->major_version
< 0 ||
5930 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5931 super_types
[info
->major_version
].name
== NULL
) {
5932 /* maybe try to auto-load a module? */
5934 "md: superblock version %d not known\n",
5935 info
->major_version
);
5938 mddev
->major_version
= info
->major_version
;
5939 mddev
->minor_version
= info
->minor_version
;
5940 mddev
->patch_version
= info
->patch_version
;
5941 mddev
->persistent
= !info
->not_persistent
;
5942 /* ensure mddev_put doesn't delete this now that there
5943 * is some minimal configuration.
5945 mddev
->ctime
= get_seconds();
5948 mddev
->major_version
= MD_MAJOR_VERSION
;
5949 mddev
->minor_version
= MD_MINOR_VERSION
;
5950 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5951 mddev
->ctime
= get_seconds();
5953 mddev
->level
= info
->level
;
5954 mddev
->clevel
[0] = 0;
5955 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5956 mddev
->raid_disks
= info
->raid_disks
;
5957 /* don't set md_minor, it is determined by which /dev/md* was
5960 if (info
->state
& (1<<MD_SB_CLEAN
))
5961 mddev
->recovery_cp
= MaxSector
;
5963 mddev
->recovery_cp
= 0;
5964 mddev
->persistent
= ! info
->not_persistent
;
5965 mddev
->external
= 0;
5967 mddev
->layout
= info
->layout
;
5968 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5970 mddev
->max_disks
= MD_SB_DISKS
;
5972 if (mddev
->persistent
)
5974 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5976 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5977 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
5978 mddev
->bitmap_info
.offset
= 0;
5980 mddev
->reshape_position
= MaxSector
;
5983 * Generate a 128 bit UUID
5985 get_random_bytes(mddev
->uuid
, 16);
5987 mddev
->new_level
= mddev
->level
;
5988 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5989 mddev
->new_layout
= mddev
->layout
;
5990 mddev
->delta_disks
= 0;
5991 mddev
->reshape_backwards
= 0;
5996 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
5998 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6000 if (mddev
->external_size
)
6003 mddev
->array_sectors
= array_sectors
;
6005 EXPORT_SYMBOL(md_set_array_sectors
);
6007 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6009 struct md_rdev
*rdev
;
6011 int fit
= (num_sectors
== 0);
6013 if (mddev
->pers
->resize
== NULL
)
6015 /* The "num_sectors" is the number of sectors of each device that
6016 * is used. This can only make sense for arrays with redundancy.
6017 * linear and raid0 always use whatever space is available. We can only
6018 * consider changing this number if no resync or reconstruction is
6019 * happening, and if the new size is acceptable. It must fit before the
6020 * sb_start or, if that is <data_offset, it must fit before the size
6021 * of each device. If num_sectors is zero, we find the largest size
6024 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6030 rdev_for_each(rdev
, mddev
) {
6031 sector_t avail
= rdev
->sectors
;
6033 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6034 num_sectors
= avail
;
6035 if (avail
< num_sectors
)
6038 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6040 revalidate_disk(mddev
->gendisk
);
6044 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6047 struct md_rdev
*rdev
;
6048 /* change the number of raid disks */
6049 if (mddev
->pers
->check_reshape
== NULL
)
6053 if (raid_disks
<= 0 ||
6054 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6056 if (mddev
->sync_thread
||
6057 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6058 mddev
->reshape_position
!= MaxSector
)
6061 rdev_for_each(rdev
, mddev
) {
6062 if (mddev
->raid_disks
< raid_disks
&&
6063 rdev
->data_offset
< rdev
->new_data_offset
)
6065 if (mddev
->raid_disks
> raid_disks
&&
6066 rdev
->data_offset
> rdev
->new_data_offset
)
6070 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6071 if (mddev
->delta_disks
< 0)
6072 mddev
->reshape_backwards
= 1;
6073 else if (mddev
->delta_disks
> 0)
6074 mddev
->reshape_backwards
= 0;
6076 rv
= mddev
->pers
->check_reshape(mddev
);
6078 mddev
->delta_disks
= 0;
6079 mddev
->reshape_backwards
= 0;
6085 * update_array_info is used to change the configuration of an
6087 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6088 * fields in the info are checked against the array.
6089 * Any differences that cannot be handled will cause an error.
6090 * Normally, only one change can be managed at a time.
6092 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6098 /* calculate expected state,ignoring low bits */
6099 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6100 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6102 if (mddev
->major_version
!= info
->major_version
||
6103 mddev
->minor_version
!= info
->minor_version
||
6104 /* mddev->patch_version != info->patch_version || */
6105 mddev
->ctime
!= info
->ctime
||
6106 mddev
->level
!= info
->level
||
6107 /* mddev->layout != info->layout || */
6108 !mddev
->persistent
!= info
->not_persistent
||
6109 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6110 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6111 ((state
^info
->state
) & 0xfffffe00)
6114 /* Check there is only one change */
6115 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6117 if (mddev
->raid_disks
!= info
->raid_disks
)
6119 if (mddev
->layout
!= info
->layout
)
6121 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6128 if (mddev
->layout
!= info
->layout
) {
6130 * we don't need to do anything at the md level, the
6131 * personality will take care of it all.
6133 if (mddev
->pers
->check_reshape
== NULL
)
6136 mddev
->new_layout
= info
->layout
;
6137 rv
= mddev
->pers
->check_reshape(mddev
);
6139 mddev
->new_layout
= mddev
->layout
;
6143 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6144 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6146 if (mddev
->raid_disks
!= info
->raid_disks
)
6147 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6149 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6150 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
)
6152 if (mddev
->recovery
|| mddev
->sync_thread
)
6154 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6155 /* add the bitmap */
6158 if (mddev
->bitmap_info
.default_offset
== 0)
6160 mddev
->bitmap_info
.offset
=
6161 mddev
->bitmap_info
.default_offset
;
6162 mddev
->bitmap_info
.space
=
6163 mddev
->bitmap_info
.default_space
;
6164 mddev
->pers
->quiesce(mddev
, 1);
6165 rv
= bitmap_create(mddev
);
6167 rv
= bitmap_load(mddev
);
6169 bitmap_destroy(mddev
);
6170 mddev
->pers
->quiesce(mddev
, 0);
6172 /* remove the bitmap */
6175 if (mddev
->bitmap
->storage
.file
)
6177 mddev
->pers
->quiesce(mddev
, 1);
6178 bitmap_destroy(mddev
);
6179 mddev
->pers
->quiesce(mddev
, 0);
6180 mddev
->bitmap_info
.offset
= 0;
6183 md_update_sb(mddev
, 1);
6187 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6189 struct md_rdev
*rdev
;
6192 if (mddev
->pers
== NULL
)
6196 rdev
= find_rdev_rcu(mddev
, dev
);
6200 md_error(mddev
, rdev
);
6201 if (!test_bit(Faulty
, &rdev
->flags
))
6209 * We have a problem here : there is no easy way to give a CHS
6210 * virtual geometry. We currently pretend that we have a 2 heads
6211 * 4 sectors (with a BIG number of cylinders...). This drives
6212 * dosfs just mad... ;-)
6214 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6216 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6220 geo
->cylinders
= mddev
->array_sectors
/ 8;
6224 static inline bool md_ioctl_valid(unsigned int cmd
)
6229 case GET_ARRAY_INFO
:
6230 case GET_BITMAP_FILE
:
6233 case HOT_REMOVE_DISK
:
6236 case RESTART_ARRAY_RW
:
6238 case SET_ARRAY_INFO
:
6239 case SET_BITMAP_FILE
:
6240 case SET_DISK_FAULTY
:
6249 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6250 unsigned int cmd
, unsigned long arg
)
6253 void __user
*argp
= (void __user
*)arg
;
6254 struct mddev
*mddev
= NULL
;
6257 if (!md_ioctl_valid(cmd
))
6262 case GET_ARRAY_INFO
:
6266 if (!capable(CAP_SYS_ADMIN
))
6271 * Commands dealing with the RAID driver but not any
6276 err
= get_version(argp
);
6282 autostart_arrays(arg
);
6289 * Commands creating/starting a new array:
6292 mddev
= bdev
->bd_disk
->private_data
;
6299 /* Some actions do not requires the mutex */
6301 case GET_ARRAY_INFO
:
6302 if (!mddev
->raid_disks
&& !mddev
->external
)
6305 err
= get_array_info(mddev
, argp
);
6309 if (!mddev
->raid_disks
&& !mddev
->external
)
6312 err
= get_disk_info(mddev
, argp
);
6315 case SET_DISK_FAULTY
:
6316 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6320 if (cmd
== ADD_NEW_DISK
)
6321 /* need to ensure md_delayed_delete() has completed */
6322 flush_workqueue(md_misc_wq
);
6324 if (cmd
== HOT_REMOVE_DISK
)
6325 /* need to ensure recovery thread has run */
6326 wait_event_interruptible_timeout(mddev
->sb_wait
,
6327 !test_bit(MD_RECOVERY_NEEDED
,
6329 msecs_to_jiffies(5000));
6330 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6331 /* Need to flush page cache, and ensure no-one else opens
6334 mutex_lock(&mddev
->open_mutex
);
6335 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6336 mutex_unlock(&mddev
->open_mutex
);
6340 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6341 mutex_unlock(&mddev
->open_mutex
);
6342 sync_blockdev(bdev
);
6344 err
= mddev_lock(mddev
);
6347 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6352 if (cmd
== SET_ARRAY_INFO
) {
6353 mdu_array_info_t info
;
6355 memset(&info
, 0, sizeof(info
));
6356 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6361 err
= update_array_info(mddev
, &info
);
6363 printk(KERN_WARNING
"md: couldn't update"
6364 " array info. %d\n", err
);
6369 if (!list_empty(&mddev
->disks
)) {
6371 "md: array %s already has disks!\n",
6376 if (mddev
->raid_disks
) {
6378 "md: array %s already initialised!\n",
6383 err
= set_array_info(mddev
, &info
);
6385 printk(KERN_WARNING
"md: couldn't set"
6386 " array info. %d\n", err
);
6393 * Commands querying/configuring an existing array:
6395 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6396 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6397 if ((!mddev
->raid_disks
&& !mddev
->external
)
6398 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6399 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6400 && cmd
!= GET_BITMAP_FILE
) {
6406 * Commands even a read-only array can execute:
6409 case GET_BITMAP_FILE
:
6410 err
= get_bitmap_file(mddev
, argp
);
6413 case RESTART_ARRAY_RW
:
6414 err
= restart_array(mddev
);
6418 err
= do_md_stop(mddev
, 0, bdev
);
6422 err
= md_set_readonly(mddev
, bdev
);
6425 case HOT_REMOVE_DISK
:
6426 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6430 /* We can support ADD_NEW_DISK on read-only arrays
6431 * on if we are re-adding a preexisting device.
6432 * So require mddev->pers and MD_DISK_SYNC.
6435 mdu_disk_info_t info
;
6436 if (copy_from_user(&info
, argp
, sizeof(info
)))
6438 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6439 /* Need to clear read-only for this */
6442 err
= add_new_disk(mddev
, &info
);
6448 if (get_user(ro
, (int __user
*)(arg
))) {
6454 /* if the bdev is going readonly the value of mddev->ro
6455 * does not matter, no writes are coming
6460 /* are we are already prepared for writes? */
6464 /* transitioning to readauto need only happen for
6465 * arrays that call md_write_start
6468 err
= restart_array(mddev
);
6471 set_disk_ro(mddev
->gendisk
, 0);
6478 * The remaining ioctls are changing the state of the
6479 * superblock, so we do not allow them on read-only arrays.
6481 if (mddev
->ro
&& mddev
->pers
) {
6482 if (mddev
->ro
== 2) {
6484 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6485 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6486 /* mddev_unlock will wake thread */
6487 /* If a device failed while we were read-only, we
6488 * need to make sure the metadata is updated now.
6490 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6491 mddev_unlock(mddev
);
6492 wait_event(mddev
->sb_wait
,
6493 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6494 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6495 mddev_lock_nointr(mddev
);
6506 mdu_disk_info_t info
;
6507 if (copy_from_user(&info
, argp
, sizeof(info
)))
6510 err
= add_new_disk(mddev
, &info
);
6515 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6519 err
= do_md_run(mddev
);
6522 case SET_BITMAP_FILE
:
6523 err
= set_bitmap_file(mddev
, (int)arg
);
6532 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6534 mddev
->hold_active
= 0;
6535 mddev_unlock(mddev
);
6539 #ifdef CONFIG_COMPAT
6540 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6541 unsigned int cmd
, unsigned long arg
)
6544 case HOT_REMOVE_DISK
:
6546 case SET_DISK_FAULTY
:
6547 case SET_BITMAP_FILE
:
6548 /* These take in integer arg, do not convert */
6551 arg
= (unsigned long)compat_ptr(arg
);
6555 return md_ioctl(bdev
, mode
, cmd
, arg
);
6557 #endif /* CONFIG_COMPAT */
6559 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6562 * Succeed if we can lock the mddev, which confirms that
6563 * it isn't being stopped right now.
6565 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6571 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6572 /* we are racing with mddev_put which is discarding this
6576 /* Wait until bdev->bd_disk is definitely gone */
6577 flush_workqueue(md_misc_wq
);
6578 /* Then retry the open from the top */
6579 return -ERESTARTSYS
;
6581 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6583 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6587 atomic_inc(&mddev
->openers
);
6588 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6589 mutex_unlock(&mddev
->open_mutex
);
6591 check_disk_change(bdev
);
6596 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6598 struct mddev
*mddev
= disk
->private_data
;
6601 atomic_dec(&mddev
->openers
);
6605 static int md_media_changed(struct gendisk
*disk
)
6607 struct mddev
*mddev
= disk
->private_data
;
6609 return mddev
->changed
;
6612 static int md_revalidate(struct gendisk
*disk
)
6614 struct mddev
*mddev
= disk
->private_data
;
6619 static const struct block_device_operations md_fops
=
6621 .owner
= THIS_MODULE
,
6623 .release
= md_release
,
6625 #ifdef CONFIG_COMPAT
6626 .compat_ioctl
= md_compat_ioctl
,
6628 .getgeo
= md_getgeo
,
6629 .media_changed
= md_media_changed
,
6630 .revalidate_disk
= md_revalidate
,
6633 static int md_thread(void *arg
)
6635 struct md_thread
*thread
= arg
;
6638 * md_thread is a 'system-thread', it's priority should be very
6639 * high. We avoid resource deadlocks individually in each
6640 * raid personality. (RAID5 does preallocation) We also use RR and
6641 * the very same RT priority as kswapd, thus we will never get
6642 * into a priority inversion deadlock.
6644 * we definitely have to have equal or higher priority than
6645 * bdflush, otherwise bdflush will deadlock if there are too
6646 * many dirty RAID5 blocks.
6649 allow_signal(SIGKILL
);
6650 while (!kthread_should_stop()) {
6652 /* We need to wait INTERRUPTIBLE so that
6653 * we don't add to the load-average.
6654 * That means we need to be sure no signals are
6657 if (signal_pending(current
))
6658 flush_signals(current
);
6660 wait_event_interruptible_timeout
6662 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6663 || kthread_should_stop(),
6666 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6667 if (!kthread_should_stop())
6668 thread
->run(thread
);
6674 void md_wakeup_thread(struct md_thread
*thread
)
6677 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6678 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6679 wake_up(&thread
->wqueue
);
6682 EXPORT_SYMBOL(md_wakeup_thread
);
6684 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6685 struct mddev
*mddev
, const char *name
)
6687 struct md_thread
*thread
;
6689 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6693 init_waitqueue_head(&thread
->wqueue
);
6696 thread
->mddev
= mddev
;
6697 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6698 thread
->tsk
= kthread_run(md_thread
, thread
,
6700 mdname(thread
->mddev
),
6702 if (IS_ERR(thread
->tsk
)) {
6708 EXPORT_SYMBOL(md_register_thread
);
6710 void md_unregister_thread(struct md_thread
**threadp
)
6712 struct md_thread
*thread
= *threadp
;
6715 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6716 /* Locking ensures that mddev_unlock does not wake_up a
6717 * non-existent thread
6719 spin_lock(&pers_lock
);
6721 spin_unlock(&pers_lock
);
6723 kthread_stop(thread
->tsk
);
6726 EXPORT_SYMBOL(md_unregister_thread
);
6728 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6730 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6733 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6735 mddev
->pers
->error_handler(mddev
,rdev
);
6736 if (mddev
->degraded
)
6737 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6738 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6739 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6740 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6741 md_wakeup_thread(mddev
->thread
);
6742 if (mddev
->event_work
.func
)
6743 queue_work(md_misc_wq
, &mddev
->event_work
);
6744 md_new_event_inintr(mddev
);
6746 EXPORT_SYMBOL(md_error
);
6748 /* seq_file implementation /proc/mdstat */
6750 static void status_unused(struct seq_file
*seq
)
6753 struct md_rdev
*rdev
;
6755 seq_printf(seq
, "unused devices: ");
6757 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6758 char b
[BDEVNAME_SIZE
];
6760 seq_printf(seq
, "%s ",
6761 bdevname(rdev
->bdev
,b
));
6764 seq_printf(seq
, "<none>");
6766 seq_printf(seq
, "\n");
6769 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
6771 sector_t max_sectors
, resync
, res
;
6772 unsigned long dt
, db
;
6775 unsigned int per_milli
;
6777 if (mddev
->curr_resync
<= 3)
6780 resync
= mddev
->curr_resync
6781 - atomic_read(&mddev
->recovery_active
);
6783 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6784 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6785 max_sectors
= mddev
->resync_max_sectors
;
6787 max_sectors
= mddev
->dev_sectors
;
6789 WARN_ON(max_sectors
== 0);
6790 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6791 * in a sector_t, and (max_sectors>>scale) will fit in a
6792 * u32, as those are the requirements for sector_div.
6793 * Thus 'scale' must be at least 10
6796 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6797 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6800 res
= (resync
>>scale
)*1000;
6801 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6805 int i
, x
= per_milli
/50, y
= 20-x
;
6806 seq_printf(seq
, "[");
6807 for (i
= 0; i
< x
; i
++)
6808 seq_printf(seq
, "=");
6809 seq_printf(seq
, ">");
6810 for (i
= 0; i
< y
; i
++)
6811 seq_printf(seq
, ".");
6812 seq_printf(seq
, "] ");
6814 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6815 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6817 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6819 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6820 "resync" : "recovery"))),
6821 per_milli
/10, per_milli
% 10,
6822 (unsigned long long) resync
/2,
6823 (unsigned long long) max_sectors
/2);
6826 * dt: time from mark until now
6827 * db: blocks written from mark until now
6828 * rt: remaining time
6830 * rt is a sector_t, so could be 32bit or 64bit.
6831 * So we divide before multiply in case it is 32bit and close
6833 * We scale the divisor (db) by 32 to avoid losing precision
6834 * near the end of resync when the number of remaining sectors
6836 * We then divide rt by 32 after multiplying by db to compensate.
6837 * The '+1' avoids division by zero if db is very small.
6839 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6841 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6842 - mddev
->resync_mark_cnt
;
6844 rt
= max_sectors
- resync
; /* number of remaining sectors */
6845 sector_div(rt
, db
/32+1);
6849 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6850 ((unsigned long)rt
% 60)/6);
6852 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6855 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6857 struct list_head
*tmp
;
6859 struct mddev
*mddev
;
6867 spin_lock(&all_mddevs_lock
);
6868 list_for_each(tmp
,&all_mddevs
)
6870 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6872 spin_unlock(&all_mddevs_lock
);
6875 spin_unlock(&all_mddevs_lock
);
6877 return (void*)2;/* tail */
6881 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6883 struct list_head
*tmp
;
6884 struct mddev
*next_mddev
, *mddev
= v
;
6890 spin_lock(&all_mddevs_lock
);
6892 tmp
= all_mddevs
.next
;
6894 tmp
= mddev
->all_mddevs
.next
;
6895 if (tmp
!= &all_mddevs
)
6896 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6898 next_mddev
= (void*)2;
6901 spin_unlock(&all_mddevs_lock
);
6909 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6911 struct mddev
*mddev
= v
;
6913 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6917 static int md_seq_show(struct seq_file
*seq
, void *v
)
6919 struct mddev
*mddev
= v
;
6921 struct md_rdev
*rdev
;
6923 if (v
== (void*)1) {
6924 struct md_personality
*pers
;
6925 seq_printf(seq
, "Personalities : ");
6926 spin_lock(&pers_lock
);
6927 list_for_each_entry(pers
, &pers_list
, list
)
6928 seq_printf(seq
, "[%s] ", pers
->name
);
6930 spin_unlock(&pers_lock
);
6931 seq_printf(seq
, "\n");
6932 seq
->poll_event
= atomic_read(&md_event_count
);
6935 if (v
== (void*)2) {
6940 spin_lock(&mddev
->lock
);
6941 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6942 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6943 mddev
->pers
? "" : "in");
6946 seq_printf(seq
, " (read-only)");
6948 seq_printf(seq
, " (auto-read-only)");
6949 seq_printf(seq
, " %s", mddev
->pers
->name
);
6954 rdev_for_each_rcu(rdev
, mddev
) {
6955 char b
[BDEVNAME_SIZE
];
6956 seq_printf(seq
, " %s[%d]",
6957 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6958 if (test_bit(WriteMostly
, &rdev
->flags
))
6959 seq_printf(seq
, "(W)");
6960 if (test_bit(Faulty
, &rdev
->flags
)) {
6961 seq_printf(seq
, "(F)");
6964 if (rdev
->raid_disk
< 0)
6965 seq_printf(seq
, "(S)"); /* spare */
6966 if (test_bit(Replacement
, &rdev
->flags
))
6967 seq_printf(seq
, "(R)");
6968 sectors
+= rdev
->sectors
;
6972 if (!list_empty(&mddev
->disks
)) {
6974 seq_printf(seq
, "\n %llu blocks",
6975 (unsigned long long)
6976 mddev
->array_sectors
/ 2);
6978 seq_printf(seq
, "\n %llu blocks",
6979 (unsigned long long)sectors
/ 2);
6981 if (mddev
->persistent
) {
6982 if (mddev
->major_version
!= 0 ||
6983 mddev
->minor_version
!= 90) {
6984 seq_printf(seq
," super %d.%d",
6985 mddev
->major_version
,
6986 mddev
->minor_version
);
6988 } else if (mddev
->external
)
6989 seq_printf(seq
, " super external:%s",
6990 mddev
->metadata_type
);
6992 seq_printf(seq
, " super non-persistent");
6995 mddev
->pers
->status(seq
, mddev
);
6996 seq_printf(seq
, "\n ");
6997 if (mddev
->pers
->sync_request
) {
6998 if (mddev
->curr_resync
> 2) {
6999 status_resync(seq
, mddev
);
7000 seq_printf(seq
, "\n ");
7001 } else if (mddev
->curr_resync
>= 1)
7002 seq_printf(seq
, "\tresync=DELAYED\n ");
7003 else if (mddev
->recovery_cp
< MaxSector
)
7004 seq_printf(seq
, "\tresync=PENDING\n ");
7007 seq_printf(seq
, "\n ");
7009 bitmap_status(seq
, mddev
->bitmap
);
7011 seq_printf(seq
, "\n");
7013 spin_unlock(&mddev
->lock
);
7018 static const struct seq_operations md_seq_ops
= {
7019 .start
= md_seq_start
,
7020 .next
= md_seq_next
,
7021 .stop
= md_seq_stop
,
7022 .show
= md_seq_show
,
7025 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7027 struct seq_file
*seq
;
7030 error
= seq_open(file
, &md_seq_ops
);
7034 seq
= file
->private_data
;
7035 seq
->poll_event
= atomic_read(&md_event_count
);
7039 static int md_unloading
;
7040 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7042 struct seq_file
*seq
= filp
->private_data
;
7046 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7047 poll_wait(filp
, &md_event_waiters
, wait
);
7049 /* always allow read */
7050 mask
= POLLIN
| POLLRDNORM
;
7052 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7053 mask
|= POLLERR
| POLLPRI
;
7057 static const struct file_operations md_seq_fops
= {
7058 .owner
= THIS_MODULE
,
7059 .open
= md_seq_open
,
7061 .llseek
= seq_lseek
,
7062 .release
= seq_release_private
,
7063 .poll
= mdstat_poll
,
7066 int register_md_personality(struct md_personality
*p
)
7068 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7070 spin_lock(&pers_lock
);
7071 list_add_tail(&p
->list
, &pers_list
);
7072 spin_unlock(&pers_lock
);
7075 EXPORT_SYMBOL(register_md_personality
);
7077 int unregister_md_personality(struct md_personality
*p
)
7079 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7080 spin_lock(&pers_lock
);
7081 list_del_init(&p
->list
);
7082 spin_unlock(&pers_lock
);
7085 EXPORT_SYMBOL(unregister_md_personality
);
7087 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7089 struct md_rdev
*rdev
;
7095 rdev_for_each_rcu(rdev
, mddev
) {
7096 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7097 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7098 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7099 atomic_read(&disk
->sync_io
);
7100 /* sync IO will cause sync_io to increase before the disk_stats
7101 * as sync_io is counted when a request starts, and
7102 * disk_stats is counted when it completes.
7103 * So resync activity will cause curr_events to be smaller than
7104 * when there was no such activity.
7105 * non-sync IO will cause disk_stat to increase without
7106 * increasing sync_io so curr_events will (eventually)
7107 * be larger than it was before. Once it becomes
7108 * substantially larger, the test below will cause
7109 * the array to appear non-idle, and resync will slow
7111 * If there is a lot of outstanding resync activity when
7112 * we set last_event to curr_events, then all that activity
7113 * completing might cause the array to appear non-idle
7114 * and resync will be slowed down even though there might
7115 * not have been non-resync activity. This will only
7116 * happen once though. 'last_events' will soon reflect
7117 * the state where there is little or no outstanding
7118 * resync requests, and further resync activity will
7119 * always make curr_events less than last_events.
7122 if (init
|| curr_events
- rdev
->last_events
> 64) {
7123 rdev
->last_events
= curr_events
;
7131 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7133 /* another "blocks" (512byte) blocks have been synced */
7134 atomic_sub(blocks
, &mddev
->recovery_active
);
7135 wake_up(&mddev
->recovery_wait
);
7137 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7138 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7139 md_wakeup_thread(mddev
->thread
);
7140 // stop recovery, signal do_sync ....
7143 EXPORT_SYMBOL(md_done_sync
);
7145 /* md_write_start(mddev, bi)
7146 * If we need to update some array metadata (e.g. 'active' flag
7147 * in superblock) before writing, schedule a superblock update
7148 * and wait for it to complete.
7150 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7153 if (bio_data_dir(bi
) != WRITE
)
7156 BUG_ON(mddev
->ro
== 1);
7157 if (mddev
->ro
== 2) {
7158 /* need to switch to read/write */
7160 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7161 md_wakeup_thread(mddev
->thread
);
7162 md_wakeup_thread(mddev
->sync_thread
);
7165 atomic_inc(&mddev
->writes_pending
);
7166 if (mddev
->safemode
== 1)
7167 mddev
->safemode
= 0;
7168 if (mddev
->in_sync
) {
7169 spin_lock(&mddev
->lock
);
7170 if (mddev
->in_sync
) {
7172 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7173 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7174 md_wakeup_thread(mddev
->thread
);
7177 spin_unlock(&mddev
->lock
);
7180 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7181 wait_event(mddev
->sb_wait
,
7182 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7184 EXPORT_SYMBOL(md_write_start
);
7186 void md_write_end(struct mddev
*mddev
)
7188 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7189 if (mddev
->safemode
== 2)
7190 md_wakeup_thread(mddev
->thread
);
7191 else if (mddev
->safemode_delay
)
7192 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7195 EXPORT_SYMBOL(md_write_end
);
7197 /* md_allow_write(mddev)
7198 * Calling this ensures that the array is marked 'active' so that writes
7199 * may proceed without blocking. It is important to call this before
7200 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7201 * Must be called with mddev_lock held.
7203 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7204 * is dropped, so return -EAGAIN after notifying userspace.
7206 int md_allow_write(struct mddev
*mddev
)
7212 if (!mddev
->pers
->sync_request
)
7215 spin_lock(&mddev
->lock
);
7216 if (mddev
->in_sync
) {
7218 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7219 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7220 if (mddev
->safemode_delay
&&
7221 mddev
->safemode
== 0)
7222 mddev
->safemode
= 1;
7223 spin_unlock(&mddev
->lock
);
7224 md_update_sb(mddev
, 0);
7225 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7227 spin_unlock(&mddev
->lock
);
7229 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7234 EXPORT_SYMBOL_GPL(md_allow_write
);
7236 #define SYNC_MARKS 10
7237 #define SYNC_MARK_STEP (3*HZ)
7238 #define UPDATE_FREQUENCY (5*60*HZ)
7239 void md_do_sync(struct md_thread
*thread
)
7241 struct mddev
*mddev
= thread
->mddev
;
7242 struct mddev
*mddev2
;
7243 unsigned int currspeed
= 0,
7245 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7246 unsigned long mark
[SYNC_MARKS
];
7247 unsigned long update_time
;
7248 sector_t mark_cnt
[SYNC_MARKS
];
7250 struct list_head
*tmp
;
7251 sector_t last_check
;
7253 struct md_rdev
*rdev
;
7254 char *desc
, *action
= NULL
;
7255 struct blk_plug plug
;
7257 /* just incase thread restarts... */
7258 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7260 if (mddev
->ro
) {/* never try to sync a read-only array */
7261 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7265 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7266 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7267 desc
= "data-check";
7269 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7270 desc
= "requested-resync";
7274 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7279 mddev
->last_sync_action
= action
?: desc
;
7281 /* we overload curr_resync somewhat here.
7282 * 0 == not engaged in resync at all
7283 * 2 == checking that there is no conflict with another sync
7284 * 1 == like 2, but have yielded to allow conflicting resync to
7286 * other == active in resync - this many blocks
7288 * Before starting a resync we must have set curr_resync to
7289 * 2, and then checked that every "conflicting" array has curr_resync
7290 * less than ours. When we find one that is the same or higher
7291 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7292 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7293 * This will mean we have to start checking from the beginning again.
7298 mddev
->curr_resync
= 2;
7301 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7303 for_each_mddev(mddev2
, tmp
) {
7304 if (mddev2
== mddev
)
7306 if (!mddev
->parallel_resync
7307 && mddev2
->curr_resync
7308 && match_mddev_units(mddev
, mddev2
)) {
7310 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7311 /* arbitrarily yield */
7312 mddev
->curr_resync
= 1;
7313 wake_up(&resync_wait
);
7315 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7316 /* no need to wait here, we can wait the next
7317 * time 'round when curr_resync == 2
7320 /* We need to wait 'interruptible' so as not to
7321 * contribute to the load average, and not to
7322 * be caught by 'softlockup'
7324 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7325 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7326 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7327 printk(KERN_INFO
"md: delaying %s of %s"
7328 " until %s has finished (they"
7329 " share one or more physical units)\n",
7330 desc
, mdname(mddev
), mdname(mddev2
));
7332 if (signal_pending(current
))
7333 flush_signals(current
);
7335 finish_wait(&resync_wait
, &wq
);
7338 finish_wait(&resync_wait
, &wq
);
7341 } while (mddev
->curr_resync
< 2);
7344 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7345 /* resync follows the size requested by the personality,
7346 * which defaults to physical size, but can be virtual size
7348 max_sectors
= mddev
->resync_max_sectors
;
7349 atomic64_set(&mddev
->resync_mismatches
, 0);
7350 /* we don't use the checkpoint if there's a bitmap */
7351 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7352 j
= mddev
->resync_min
;
7353 else if (!mddev
->bitmap
)
7354 j
= mddev
->recovery_cp
;
7356 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7357 max_sectors
= mddev
->resync_max_sectors
;
7359 /* recovery follows the physical size of devices */
7360 max_sectors
= mddev
->dev_sectors
;
7363 rdev_for_each_rcu(rdev
, mddev
)
7364 if (rdev
->raid_disk
>= 0 &&
7365 !test_bit(Faulty
, &rdev
->flags
) &&
7366 !test_bit(In_sync
, &rdev
->flags
) &&
7367 rdev
->recovery_offset
< j
)
7368 j
= rdev
->recovery_offset
;
7371 /* If there is a bitmap, we need to make sure all
7372 * writes that started before we added a spare
7373 * complete before we start doing a recovery.
7374 * Otherwise the write might complete and (via
7375 * bitmap_endwrite) set a bit in the bitmap after the
7376 * recovery has checked that bit and skipped that
7379 if (mddev
->bitmap
) {
7380 mddev
->pers
->quiesce(mddev
, 1);
7381 mddev
->pers
->quiesce(mddev
, 0);
7385 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7386 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7387 " %d KB/sec/disk.\n", speed_min(mddev
));
7388 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7389 "(but not more than %d KB/sec) for %s.\n",
7390 speed_max(mddev
), desc
);
7392 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7395 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7397 mark_cnt
[m
] = io_sectors
;
7400 mddev
->resync_mark
= mark
[last_mark
];
7401 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7404 * Tune reconstruction:
7406 window
= 32*(PAGE_SIZE
/512);
7407 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7408 window
/2, (unsigned long long)max_sectors
/2);
7410 atomic_set(&mddev
->recovery_active
, 0);
7415 "md: resuming %s of %s from checkpoint.\n",
7416 desc
, mdname(mddev
));
7417 mddev
->curr_resync
= j
;
7419 mddev
->curr_resync
= 3; /* no longer delayed */
7420 mddev
->curr_resync_completed
= j
;
7421 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7422 md_new_event(mddev
);
7423 update_time
= jiffies
;
7425 blk_start_plug(&plug
);
7426 while (j
< max_sectors
) {
7431 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7432 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7433 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7434 > (max_sectors
>> 4)) ||
7435 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7436 (j
- mddev
->curr_resync_completed
)*2
7437 >= mddev
->resync_max
- mddev
->curr_resync_completed
7439 /* time to update curr_resync_completed */
7440 wait_event(mddev
->recovery_wait
,
7441 atomic_read(&mddev
->recovery_active
) == 0);
7442 mddev
->curr_resync_completed
= j
;
7443 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7444 j
> mddev
->recovery_cp
)
7445 mddev
->recovery_cp
= j
;
7446 update_time
= jiffies
;
7447 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7448 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7451 while (j
>= mddev
->resync_max
&&
7452 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7453 /* As this condition is controlled by user-space,
7454 * we can block indefinitely, so use '_interruptible'
7455 * to avoid triggering warnings.
7457 flush_signals(current
); /* just in case */
7458 wait_event_interruptible(mddev
->recovery_wait
,
7459 mddev
->resync_max
> j
7460 || test_bit(MD_RECOVERY_INTR
,
7464 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7467 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7468 currspeed
< speed_min(mddev
));
7470 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7474 if (!skipped
) { /* actual IO requested */
7475 io_sectors
+= sectors
;
7476 atomic_add(sectors
, &mddev
->recovery_active
);
7479 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7484 mddev
->curr_resync
= j
;
7485 mddev
->curr_mark_cnt
= io_sectors
;
7486 if (last_check
== 0)
7487 /* this is the earliest that rebuild will be
7488 * visible in /proc/mdstat
7490 md_new_event(mddev
);
7492 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7495 last_check
= io_sectors
;
7497 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7499 int next
= (last_mark
+1) % SYNC_MARKS
;
7501 mddev
->resync_mark
= mark
[next
];
7502 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7503 mark
[next
] = jiffies
;
7504 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7508 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7512 * this loop exits only if either when we are slower than
7513 * the 'hard' speed limit, or the system was IO-idle for
7515 * the system might be non-idle CPU-wise, but we only care
7516 * about not overloading the IO subsystem. (things like an
7517 * e2fsck being done on the RAID array should execute fast)
7521 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7522 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7523 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7525 if (currspeed
> speed_min(mddev
)) {
7526 if ((currspeed
> speed_max(mddev
)) ||
7527 !is_mddev_idle(mddev
, 0)) {
7533 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7534 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7535 ? "interrupted" : "done");
7537 * this also signals 'finished resyncing' to md_stop
7539 blk_finish_plug(&plug
);
7540 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7542 /* tell personality that we are finished */
7543 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7545 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7546 mddev
->curr_resync
> 2) {
7547 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7548 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7549 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7551 "md: checkpointing %s of %s.\n",
7552 desc
, mdname(mddev
));
7553 if (test_bit(MD_RECOVERY_ERROR
,
7555 mddev
->recovery_cp
=
7556 mddev
->curr_resync_completed
;
7558 mddev
->recovery_cp
=
7562 mddev
->recovery_cp
= MaxSector
;
7564 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7565 mddev
->curr_resync
= MaxSector
;
7567 rdev_for_each_rcu(rdev
, mddev
)
7568 if (rdev
->raid_disk
>= 0 &&
7569 mddev
->delta_disks
>= 0 &&
7570 !test_bit(Faulty
, &rdev
->flags
) &&
7571 !test_bit(In_sync
, &rdev
->flags
) &&
7572 rdev
->recovery_offset
< mddev
->curr_resync
)
7573 rdev
->recovery_offset
= mddev
->curr_resync
;
7578 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7580 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7581 /* We completed so min/max setting can be forgotten if used. */
7582 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7583 mddev
->resync_min
= 0;
7584 mddev
->resync_max
= MaxSector
;
7585 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7586 mddev
->resync_min
= mddev
->curr_resync_completed
;
7587 mddev
->curr_resync
= 0;
7588 wake_up(&resync_wait
);
7589 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7590 md_wakeup_thread(mddev
->thread
);
7593 EXPORT_SYMBOL_GPL(md_do_sync
);
7595 static int remove_and_add_spares(struct mddev
*mddev
,
7596 struct md_rdev
*this)
7598 struct md_rdev
*rdev
;
7602 rdev_for_each(rdev
, mddev
)
7603 if ((this == NULL
|| rdev
== this) &&
7604 rdev
->raid_disk
>= 0 &&
7605 !test_bit(Blocked
, &rdev
->flags
) &&
7606 (test_bit(Faulty
, &rdev
->flags
) ||
7607 ! test_bit(In_sync
, &rdev
->flags
)) &&
7608 atomic_read(&rdev
->nr_pending
)==0) {
7609 if (mddev
->pers
->hot_remove_disk(
7610 mddev
, rdev
) == 0) {
7611 sysfs_unlink_rdev(mddev
, rdev
);
7612 rdev
->raid_disk
= -1;
7616 if (removed
&& mddev
->kobj
.sd
)
7617 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7622 rdev_for_each(rdev
, mddev
) {
7623 if (rdev
->raid_disk
>= 0 &&
7624 !test_bit(In_sync
, &rdev
->flags
) &&
7625 !test_bit(Faulty
, &rdev
->flags
))
7627 if (rdev
->raid_disk
>= 0)
7629 if (test_bit(Faulty
, &rdev
->flags
))
7632 ! (rdev
->saved_raid_disk
>= 0 &&
7633 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7636 if (rdev
->saved_raid_disk
< 0)
7637 rdev
->recovery_offset
= 0;
7639 hot_add_disk(mddev
, rdev
) == 0) {
7640 if (sysfs_link_rdev(mddev
, rdev
))
7641 /* failure here is OK */;
7643 md_new_event(mddev
);
7644 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7649 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7653 static void md_start_sync(struct work_struct
*ws
)
7655 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7657 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7660 if (!mddev
->sync_thread
) {
7661 printk(KERN_ERR
"%s: could not start resync"
7664 /* leave the spares where they are, it shouldn't hurt */
7665 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7666 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7667 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7668 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7669 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7670 wake_up(&resync_wait
);
7671 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7673 if (mddev
->sysfs_action
)
7674 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7676 md_wakeup_thread(mddev
->sync_thread
);
7677 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7678 md_new_event(mddev
);
7682 * This routine is regularly called by all per-raid-array threads to
7683 * deal with generic issues like resync and super-block update.
7684 * Raid personalities that don't have a thread (linear/raid0) do not
7685 * need this as they never do any recovery or update the superblock.
7687 * It does not do any resync itself, but rather "forks" off other threads
7688 * to do that as needed.
7689 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7690 * "->recovery" and create a thread at ->sync_thread.
7691 * When the thread finishes it sets MD_RECOVERY_DONE
7692 * and wakeups up this thread which will reap the thread and finish up.
7693 * This thread also removes any faulty devices (with nr_pending == 0).
7695 * The overall approach is:
7696 * 1/ if the superblock needs updating, update it.
7697 * 2/ If a recovery thread is running, don't do anything else.
7698 * 3/ If recovery has finished, clean up, possibly marking spares active.
7699 * 4/ If there are any faulty devices, remove them.
7700 * 5/ If array is degraded, try to add spares devices
7701 * 6/ If array has spares or is not in-sync, start a resync thread.
7703 void md_check_recovery(struct mddev
*mddev
)
7705 if (mddev
->suspended
)
7709 bitmap_daemon_work(mddev
);
7711 if (signal_pending(current
)) {
7712 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7713 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7715 mddev
->safemode
= 2;
7717 flush_signals(current
);
7720 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7723 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
7724 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7725 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7726 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7727 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7728 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7732 if (mddev_trylock(mddev
)) {
7736 /* On a read-only array we can:
7737 * - remove failed devices
7738 * - add already-in_sync devices if the array itself
7740 * As we only add devices that are already in-sync,
7741 * we can activate the spares immediately.
7743 remove_and_add_spares(mddev
, NULL
);
7744 /* There is no thread, but we need to call
7745 * ->spare_active and clear saved_raid_disk
7747 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7748 md_reap_sync_thread(mddev
);
7749 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7753 if (!mddev
->external
) {
7755 spin_lock(&mddev
->lock
);
7756 if (mddev
->safemode
&&
7757 !atomic_read(&mddev
->writes_pending
) &&
7759 mddev
->recovery_cp
== MaxSector
) {
7762 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7764 if (mddev
->safemode
== 1)
7765 mddev
->safemode
= 0;
7766 spin_unlock(&mddev
->lock
);
7768 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7771 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7772 md_update_sb(mddev
, 0);
7774 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7775 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7776 /* resync/recovery still happening */
7777 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7780 if (mddev
->sync_thread
) {
7781 md_reap_sync_thread(mddev
);
7784 /* Set RUNNING before clearing NEEDED to avoid
7785 * any transients in the value of "sync_action".
7787 mddev
->curr_resync_completed
= 0;
7788 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7789 /* Clear some bits that don't mean anything, but
7792 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7793 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7795 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7796 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7798 /* no recovery is running.
7799 * remove any failed drives, then
7800 * add spares if possible.
7801 * Spares are also removed and re-added, to allow
7802 * the personality to fail the re-add.
7805 if (mddev
->reshape_position
!= MaxSector
) {
7806 if (mddev
->pers
->check_reshape
== NULL
||
7807 mddev
->pers
->check_reshape(mddev
) != 0)
7808 /* Cannot proceed */
7810 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7811 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7812 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7813 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7814 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7815 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7816 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7817 } else if (mddev
->recovery_cp
< MaxSector
) {
7818 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7819 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7820 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7821 /* nothing to be done ... */
7824 if (mddev
->pers
->sync_request
) {
7826 /* We are adding a device or devices to an array
7827 * which has the bitmap stored on all devices.
7828 * So make sure all bitmap pages get written
7830 bitmap_write_all(mddev
->bitmap
);
7832 INIT_WORK(&mddev
->del_work
, md_start_sync
);
7833 queue_work(md_misc_wq
, &mddev
->del_work
);
7837 if (!mddev
->sync_thread
) {
7838 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7839 wake_up(&resync_wait
);
7840 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7842 if (mddev
->sysfs_action
)
7843 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7846 wake_up(&mddev
->sb_wait
);
7847 mddev_unlock(mddev
);
7850 EXPORT_SYMBOL(md_check_recovery
);
7852 void md_reap_sync_thread(struct mddev
*mddev
)
7854 struct md_rdev
*rdev
;
7856 /* resync has finished, collect result */
7857 md_unregister_thread(&mddev
->sync_thread
);
7858 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7859 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7861 /* activate any spares */
7862 if (mddev
->pers
->spare_active(mddev
)) {
7863 sysfs_notify(&mddev
->kobj
, NULL
,
7865 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7868 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7869 mddev
->pers
->finish_reshape
)
7870 mddev
->pers
->finish_reshape(mddev
);
7872 /* If array is no-longer degraded, then any saved_raid_disk
7873 * information must be scrapped.
7875 if (!mddev
->degraded
)
7876 rdev_for_each(rdev
, mddev
)
7877 rdev
->saved_raid_disk
= -1;
7879 md_update_sb(mddev
, 1);
7880 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7881 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7882 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7883 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7884 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7885 wake_up(&resync_wait
);
7886 /* flag recovery needed just to double check */
7887 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7888 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7889 md_new_event(mddev
);
7890 if (mddev
->event_work
.func
)
7891 queue_work(md_misc_wq
, &mddev
->event_work
);
7893 EXPORT_SYMBOL(md_reap_sync_thread
);
7895 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7897 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7898 wait_event_timeout(rdev
->blocked_wait
,
7899 !test_bit(Blocked
, &rdev
->flags
) &&
7900 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7901 msecs_to_jiffies(5000));
7902 rdev_dec_pending(rdev
, mddev
);
7904 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7906 void md_finish_reshape(struct mddev
*mddev
)
7908 /* called be personality module when reshape completes. */
7909 struct md_rdev
*rdev
;
7911 rdev_for_each(rdev
, mddev
) {
7912 if (rdev
->data_offset
> rdev
->new_data_offset
)
7913 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7915 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7916 rdev
->data_offset
= rdev
->new_data_offset
;
7919 EXPORT_SYMBOL(md_finish_reshape
);
7921 /* Bad block management.
7922 * We can record which blocks on each device are 'bad' and so just
7923 * fail those blocks, or that stripe, rather than the whole device.
7924 * Entries in the bad-block table are 64bits wide. This comprises:
7925 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7926 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7927 * A 'shift' can be set so that larger blocks are tracked and
7928 * consequently larger devices can be covered.
7929 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7931 * Locking of the bad-block table uses a seqlock so md_is_badblock
7932 * might need to retry if it is very unlucky.
7933 * We will sometimes want to check for bad blocks in a bi_end_io function,
7934 * so we use the write_seqlock_irq variant.
7936 * When looking for a bad block we specify a range and want to
7937 * know if any block in the range is bad. So we binary-search
7938 * to the last range that starts at-or-before the given endpoint,
7939 * (or "before the sector after the target range")
7940 * then see if it ends after the given start.
7942 * 0 if there are no known bad blocks in the range
7943 * 1 if there are known bad block which are all acknowledged
7944 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7945 * plus the start/length of the first bad section we overlap.
7947 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7948 sector_t
*first_bad
, int *bad_sectors
)
7954 sector_t target
= s
+ sectors
;
7957 if (bb
->shift
> 0) {
7958 /* round the start down, and the end up */
7960 target
+= (1<<bb
->shift
) - 1;
7961 target
>>= bb
->shift
;
7962 sectors
= target
- s
;
7964 /* 'target' is now the first block after the bad range */
7967 seq
= read_seqbegin(&bb
->lock
);
7972 /* Binary search between lo and hi for 'target'
7973 * i.e. for the last range that starts before 'target'
7975 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7976 * are known not to be the last range before target.
7977 * VARIANT: hi-lo is the number of possible
7978 * ranges, and decreases until it reaches 1
7980 while (hi
- lo
> 1) {
7981 int mid
= (lo
+ hi
) / 2;
7982 sector_t a
= BB_OFFSET(p
[mid
]);
7984 /* This could still be the one, earlier ranges
7988 /* This and later ranges are definitely out. */
7991 /* 'lo' might be the last that started before target, but 'hi' isn't */
7993 /* need to check all range that end after 's' to see if
7994 * any are unacknowledged.
7997 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7998 if (BB_OFFSET(p
[lo
]) < target
) {
7999 /* starts before the end, and finishes after
8000 * the start, so they must overlap
8002 if (rv
!= -1 && BB_ACK(p
[lo
]))
8006 *first_bad
= BB_OFFSET(p
[lo
]);
8007 *bad_sectors
= BB_LEN(p
[lo
]);
8013 if (read_seqretry(&bb
->lock
, seq
))
8018 EXPORT_SYMBOL_GPL(md_is_badblock
);
8021 * Add a range of bad blocks to the table.
8022 * This might extend the table, or might contract it
8023 * if two adjacent ranges can be merged.
8024 * We binary-search to find the 'insertion' point, then
8025 * decide how best to handle it.
8027 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8033 unsigned long flags
;
8036 /* badblocks are disabled */
8040 /* round the start down, and the end up */
8041 sector_t next
= s
+ sectors
;
8043 next
+= (1<<bb
->shift
) - 1;
8048 write_seqlock_irqsave(&bb
->lock
, flags
);
8053 /* Find the last range that starts at-or-before 's' */
8054 while (hi
- lo
> 1) {
8055 int mid
= (lo
+ hi
) / 2;
8056 sector_t a
= BB_OFFSET(p
[mid
]);
8062 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8066 /* we found a range that might merge with the start
8069 sector_t a
= BB_OFFSET(p
[lo
]);
8070 sector_t e
= a
+ BB_LEN(p
[lo
]);
8071 int ack
= BB_ACK(p
[lo
]);
8073 /* Yes, we can merge with a previous range */
8074 if (s
== a
&& s
+ sectors
>= e
)
8075 /* new range covers old */
8078 ack
= ack
&& acknowledged
;
8080 if (e
< s
+ sectors
)
8082 if (e
- a
<= BB_MAX_LEN
) {
8083 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8086 /* does not all fit in one range,
8087 * make p[lo] maximal
8089 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8090 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8096 if (sectors
&& hi
< bb
->count
) {
8097 /* 'hi' points to the first range that starts after 's'.
8098 * Maybe we can merge with the start of that range */
8099 sector_t a
= BB_OFFSET(p
[hi
]);
8100 sector_t e
= a
+ BB_LEN(p
[hi
]);
8101 int ack
= BB_ACK(p
[hi
]);
8102 if (a
<= s
+ sectors
) {
8103 /* merging is possible */
8104 if (e
<= s
+ sectors
) {
8109 ack
= ack
&& acknowledged
;
8112 if (e
- a
<= BB_MAX_LEN
) {
8113 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8116 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8124 if (sectors
== 0 && hi
< bb
->count
) {
8125 /* we might be able to combine lo and hi */
8126 /* Note: 's' is at the end of 'lo' */
8127 sector_t a
= BB_OFFSET(p
[hi
]);
8128 int lolen
= BB_LEN(p
[lo
]);
8129 int hilen
= BB_LEN(p
[hi
]);
8130 int newlen
= lolen
+ hilen
- (s
- a
);
8131 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8132 /* yes, we can combine them */
8133 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8134 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8135 memmove(p
+ hi
, p
+ hi
+ 1,
8136 (bb
->count
- hi
- 1) * 8);
8141 /* didn't merge (it all).
8142 * Need to add a range just before 'hi' */
8143 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8144 /* No room for more */
8148 int this_sectors
= sectors
;
8149 memmove(p
+ hi
+ 1, p
+ hi
,
8150 (bb
->count
- hi
) * 8);
8153 if (this_sectors
> BB_MAX_LEN
)
8154 this_sectors
= BB_MAX_LEN
;
8155 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8156 sectors
-= this_sectors
;
8163 bb
->unacked_exist
= 1;
8164 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8169 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8174 s
+= rdev
->new_data_offset
;
8176 s
+= rdev
->data_offset
;
8177 rv
= md_set_badblocks(&rdev
->badblocks
,
8180 /* Make sure they get written out promptly */
8181 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8182 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8183 md_wakeup_thread(rdev
->mddev
->thread
);
8187 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8190 * Remove a range of bad blocks from the table.
8191 * This may involve extending the table if we spilt a region,
8192 * but it must not fail. So if the table becomes full, we just
8193 * drop the remove request.
8195 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8199 sector_t target
= s
+ sectors
;
8202 if (bb
->shift
> 0) {
8203 /* When clearing we round the start up and the end down.
8204 * This should not matter as the shift should align with
8205 * the block size and no rounding should ever be needed.
8206 * However it is better the think a block is bad when it
8207 * isn't than to think a block is not bad when it is.
8209 s
+= (1<<bb
->shift
) - 1;
8211 target
>>= bb
->shift
;
8212 sectors
= target
- s
;
8215 write_seqlock_irq(&bb
->lock
);
8220 /* Find the last range that starts before 'target' */
8221 while (hi
- lo
> 1) {
8222 int mid
= (lo
+ hi
) / 2;
8223 sector_t a
= BB_OFFSET(p
[mid
]);
8230 /* p[lo] is the last range that could overlap the
8231 * current range. Earlier ranges could also overlap,
8232 * but only this one can overlap the end of the range.
8234 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8235 /* Partial overlap, leave the tail of this range */
8236 int ack
= BB_ACK(p
[lo
]);
8237 sector_t a
= BB_OFFSET(p
[lo
]);
8238 sector_t end
= a
+ BB_LEN(p
[lo
]);
8241 /* we need to split this range */
8242 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8246 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8248 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8251 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8252 /* there is no longer an overlap */
8257 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8258 /* This range does overlap */
8259 if (BB_OFFSET(p
[lo
]) < s
) {
8260 /* Keep the early parts of this range. */
8261 int ack
= BB_ACK(p
[lo
]);
8262 sector_t start
= BB_OFFSET(p
[lo
]);
8263 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8264 /* now low doesn't overlap, so.. */
8269 /* 'lo' is strictly before, 'hi' is strictly after,
8270 * anything between needs to be discarded
8273 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8274 bb
->count
-= (hi
- lo
- 1);
8280 write_sequnlock_irq(&bb
->lock
);
8284 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8288 s
+= rdev
->new_data_offset
;
8290 s
+= rdev
->data_offset
;
8291 return md_clear_badblocks(&rdev
->badblocks
,
8294 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8297 * Acknowledge all bad blocks in a list.
8298 * This only succeeds if ->changed is clear. It is used by
8299 * in-kernel metadata updates
8301 void md_ack_all_badblocks(struct badblocks
*bb
)
8303 if (bb
->page
== NULL
|| bb
->changed
)
8304 /* no point even trying */
8306 write_seqlock_irq(&bb
->lock
);
8308 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8311 for (i
= 0; i
< bb
->count
; i
++) {
8312 if (!BB_ACK(p
[i
])) {
8313 sector_t start
= BB_OFFSET(p
[i
]);
8314 int len
= BB_LEN(p
[i
]);
8315 p
[i
] = BB_MAKE(start
, len
, 1);
8318 bb
->unacked_exist
= 0;
8320 write_sequnlock_irq(&bb
->lock
);
8322 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8324 /* sysfs access to bad-blocks list.
8325 * We present two files.
8326 * 'bad-blocks' lists sector numbers and lengths of ranges that
8327 * are recorded as bad. The list is truncated to fit within
8328 * the one-page limit of sysfs.
8329 * Writing "sector length" to this file adds an acknowledged
8331 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8332 * been acknowledged. Writing to this file adds bad blocks
8333 * without acknowledging them. This is largely for testing.
8337 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8348 seq
= read_seqbegin(&bb
->lock
);
8353 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8354 sector_t s
= BB_OFFSET(p
[i
]);
8355 unsigned int length
= BB_LEN(p
[i
]);
8356 int ack
= BB_ACK(p
[i
]);
8362 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8363 (unsigned long long)s
<< bb
->shift
,
8364 length
<< bb
->shift
);
8366 if (unack
&& len
== 0)
8367 bb
->unacked_exist
= 0;
8369 if (read_seqretry(&bb
->lock
, seq
))
8378 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8380 unsigned long long sector
;
8384 /* Allow clearing via sysfs *only* for testing/debugging.
8385 * Normally only a successful write may clear a badblock
8388 if (page
[0] == '-') {
8392 #endif /* DO_DEBUG */
8394 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8396 if (newline
!= '\n')
8408 md_clear_badblocks(bb
, sector
, length
);
8411 #endif /* DO_DEBUG */
8412 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8418 static int md_notify_reboot(struct notifier_block
*this,
8419 unsigned long code
, void *x
)
8421 struct list_head
*tmp
;
8422 struct mddev
*mddev
;
8425 for_each_mddev(mddev
, tmp
) {
8426 if (mddev_trylock(mddev
)) {
8428 __md_stop_writes(mddev
);
8429 if (mddev
->persistent
)
8430 mddev
->safemode
= 2;
8431 mddev_unlock(mddev
);
8436 * certain more exotic SCSI devices are known to be
8437 * volatile wrt too early system reboots. While the
8438 * right place to handle this issue is the given
8439 * driver, we do want to have a safe RAID driver ...
8447 static struct notifier_block md_notifier
= {
8448 .notifier_call
= md_notify_reboot
,
8450 .priority
= INT_MAX
, /* before any real devices */
8453 static void md_geninit(void)
8455 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8457 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8460 static int __init
md_init(void)
8464 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8468 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8472 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8475 if ((ret
= register_blkdev(0, "mdp")) < 0)
8479 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8480 md_probe
, NULL
, NULL
);
8481 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8482 md_probe
, NULL
, NULL
);
8484 register_reboot_notifier(&md_notifier
);
8485 raid_table_header
= register_sysctl_table(raid_root_table
);
8491 unregister_blkdev(MD_MAJOR
, "md");
8493 destroy_workqueue(md_misc_wq
);
8495 destroy_workqueue(md_wq
);
8503 * Searches all registered partitions for autorun RAID arrays
8507 static LIST_HEAD(all_detected_devices
);
8508 struct detected_devices_node
{
8509 struct list_head list
;
8513 void md_autodetect_dev(dev_t dev
)
8515 struct detected_devices_node
*node_detected_dev
;
8517 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8518 if (node_detected_dev
) {
8519 node_detected_dev
->dev
= dev
;
8520 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8522 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8523 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8527 static void autostart_arrays(int part
)
8529 struct md_rdev
*rdev
;
8530 struct detected_devices_node
*node_detected_dev
;
8532 int i_scanned
, i_passed
;
8537 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8539 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8541 node_detected_dev
= list_entry(all_detected_devices
.next
,
8542 struct detected_devices_node
, list
);
8543 list_del(&node_detected_dev
->list
);
8544 dev
= node_detected_dev
->dev
;
8545 kfree(node_detected_dev
);
8546 rdev
= md_import_device(dev
,0, 90);
8550 if (test_bit(Faulty
, &rdev
->flags
))
8553 set_bit(AutoDetected
, &rdev
->flags
);
8554 list_add(&rdev
->same_set
, &pending_raid_disks
);
8558 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8559 i_scanned
, i_passed
);
8561 autorun_devices(part
);
8564 #endif /* !MODULE */
8566 static __exit
void md_exit(void)
8568 struct mddev
*mddev
;
8569 struct list_head
*tmp
;
8572 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8573 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8575 unregister_blkdev(MD_MAJOR
,"md");
8576 unregister_blkdev(mdp_major
, "mdp");
8577 unregister_reboot_notifier(&md_notifier
);
8578 unregister_sysctl_table(raid_table_header
);
8580 /* We cannot unload the modules while some process is
8581 * waiting for us in select() or poll() - wake them up
8584 while (waitqueue_active(&md_event_waiters
)) {
8585 /* not safe to leave yet */
8586 wake_up(&md_event_waiters
);
8590 remove_proc_entry("mdstat", NULL
);
8592 for_each_mddev(mddev
, tmp
) {
8593 export_array(mddev
);
8594 mddev
->hold_active
= 0;
8596 destroy_workqueue(md_misc_wq
);
8597 destroy_workqueue(md_wq
);
8600 subsys_initcall(md_init
);
8601 module_exit(md_exit
)
8603 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8605 return sprintf(buffer
, "%d", start_readonly
);
8607 static int set_ro(const char *val
, struct kernel_param
*kp
)
8610 int num
= simple_strtoul(val
, &e
, 10);
8611 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8612 start_readonly
= num
;
8618 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8619 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8620 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8622 MODULE_LICENSE("GPL");
8623 MODULE_DESCRIPTION("MD RAID framework");
8625 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);