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 struct attribute_group md_redundancy_group
;
595 void mddev_unlock(struct mddev
*mddev
)
597 if (mddev
->to_remove
) {
598 /* These cannot be removed under reconfig_mutex as
599 * an access to the files will try to take reconfig_mutex
600 * while holding the file unremovable, which leads to
602 * So hold set sysfs_active while the remove in happeing,
603 * and anything else which might set ->to_remove or my
604 * otherwise change the sysfs namespace will fail with
605 * -EBUSY if sysfs_active is still set.
606 * We set sysfs_active under reconfig_mutex and elsewhere
607 * test it under the same mutex to ensure its correct value
610 struct attribute_group
*to_remove
= mddev
->to_remove
;
611 mddev
->to_remove
= NULL
;
612 mddev
->sysfs_active
= 1;
613 mutex_unlock(&mddev
->reconfig_mutex
);
615 if (mddev
->kobj
.sd
) {
616 if (to_remove
!= &md_redundancy_group
)
617 sysfs_remove_group(&mddev
->kobj
, to_remove
);
618 if (mddev
->pers
== NULL
||
619 mddev
->pers
->sync_request
== NULL
) {
620 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
621 if (mddev
->sysfs_action
)
622 sysfs_put(mddev
->sysfs_action
);
623 mddev
->sysfs_action
= NULL
;
626 mddev
->sysfs_active
= 0;
628 mutex_unlock(&mddev
->reconfig_mutex
);
630 /* As we've dropped the mutex we need a spinlock to
631 * make sure the thread doesn't disappear
633 spin_lock(&pers_lock
);
634 md_wakeup_thread(mddev
->thread
);
635 spin_unlock(&pers_lock
);
637 EXPORT_SYMBOL_GPL(mddev_unlock
);
639 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
641 struct md_rdev
*rdev
;
643 rdev_for_each_rcu(rdev
, mddev
)
644 if (rdev
->desc_nr
== nr
)
650 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
652 struct md_rdev
*rdev
;
654 rdev_for_each(rdev
, mddev
)
655 if (rdev
->bdev
->bd_dev
== dev
)
661 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
663 struct md_rdev
*rdev
;
665 rdev_for_each_rcu(rdev
, mddev
)
666 if (rdev
->bdev
->bd_dev
== dev
)
672 static struct md_personality
*find_pers(int level
, char *clevel
)
674 struct md_personality
*pers
;
675 list_for_each_entry(pers
, &pers_list
, list
) {
676 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
678 if (strcmp(pers
->name
, clevel
)==0)
684 /* return the offset of the super block in 512byte sectors */
685 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
687 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
688 return MD_NEW_SIZE_SECTORS(num_sectors
);
691 static int alloc_disk_sb(struct md_rdev
*rdev
)
693 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
694 if (!rdev
->sb_page
) {
695 printk(KERN_ALERT
"md: out of memory.\n");
702 void md_rdev_clear(struct md_rdev
*rdev
)
705 put_page(rdev
->sb_page
);
707 rdev
->sb_page
= NULL
;
712 put_page(rdev
->bb_page
);
713 rdev
->bb_page
= NULL
;
715 kfree(rdev
->badblocks
.page
);
716 rdev
->badblocks
.page
= NULL
;
718 EXPORT_SYMBOL_GPL(md_rdev_clear
);
720 static void super_written(struct bio
*bio
, int error
)
722 struct md_rdev
*rdev
= bio
->bi_private
;
723 struct mddev
*mddev
= rdev
->mddev
;
725 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
726 printk("md: super_written gets error=%d, uptodate=%d\n",
727 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
728 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
729 md_error(mddev
, rdev
);
732 if (atomic_dec_and_test(&mddev
->pending_writes
))
733 wake_up(&mddev
->sb_wait
);
737 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
738 sector_t sector
, int size
, struct page
*page
)
740 /* write first size bytes of page to sector of rdev
741 * Increment mddev->pending_writes before returning
742 * and decrement it on completion, waking up sb_wait
743 * if zero is reached.
744 * If an error occurred, call md_error
746 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
748 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
749 bio
->bi_iter
.bi_sector
= sector
;
750 bio_add_page(bio
, page
, size
, 0);
751 bio
->bi_private
= rdev
;
752 bio
->bi_end_io
= super_written
;
754 atomic_inc(&mddev
->pending_writes
);
755 submit_bio(WRITE_FLUSH_FUA
, bio
);
758 void md_super_wait(struct mddev
*mddev
)
760 /* wait for all superblock writes that were scheduled to complete */
761 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
764 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
765 struct page
*page
, int rw
, bool metadata_op
)
767 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
770 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
771 rdev
->meta_bdev
: rdev
->bdev
;
773 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
774 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
775 (rdev
->mddev
->reshape_backwards
==
776 (sector
>= rdev
->mddev
->reshape_position
)))
777 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
779 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
780 bio_add_page(bio
, page
, size
, 0);
781 submit_bio_wait(rw
, bio
);
783 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
787 EXPORT_SYMBOL_GPL(sync_page_io
);
789 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
791 char b
[BDEVNAME_SIZE
];
796 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
802 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
803 bdevname(rdev
->bdev
,b
));
807 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
809 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
810 sb1
->set_uuid1
== sb2
->set_uuid1
&&
811 sb1
->set_uuid2
== sb2
->set_uuid2
&&
812 sb1
->set_uuid3
== sb2
->set_uuid3
;
815 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
818 mdp_super_t
*tmp1
, *tmp2
;
820 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
821 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
823 if (!tmp1
|| !tmp2
) {
825 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
833 * nr_disks is not constant
838 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
845 static u32
md_csum_fold(u32 csum
)
847 csum
= (csum
& 0xffff) + (csum
>> 16);
848 return (csum
& 0xffff) + (csum
>> 16);
851 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
854 u32
*sb32
= (u32
*)sb
;
856 unsigned int disk_csum
, csum
;
858 disk_csum
= sb
->sb_csum
;
861 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
863 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
866 /* This used to use csum_partial, which was wrong for several
867 * reasons including that different results are returned on
868 * different architectures. It isn't critical that we get exactly
869 * the same return value as before (we always csum_fold before
870 * testing, and that removes any differences). However as we
871 * know that csum_partial always returned a 16bit value on
872 * alphas, do a fold to maximise conformity to previous behaviour.
874 sb
->sb_csum
= md_csum_fold(disk_csum
);
876 sb
->sb_csum
= disk_csum
;
882 * Handle superblock details.
883 * We want to be able to handle multiple superblock formats
884 * so we have a common interface to them all, and an array of
885 * different handlers.
886 * We rely on user-space to write the initial superblock, and support
887 * reading and updating of superblocks.
888 * Interface methods are:
889 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
890 * loads and validates a superblock on dev.
891 * if refdev != NULL, compare superblocks on both devices
893 * 0 - dev has a superblock that is compatible with refdev
894 * 1 - dev has a superblock that is compatible and newer than refdev
895 * so dev should be used as the refdev in future
896 * -EINVAL superblock incompatible or invalid
897 * -othererror e.g. -EIO
899 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
900 * Verify that dev is acceptable into mddev.
901 * The first time, mddev->raid_disks will be 0, and data from
902 * dev should be merged in. Subsequent calls check that dev
903 * is new enough. Return 0 or -EINVAL
905 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
906 * Update the superblock for rdev with data in mddev
907 * This does not write to disc.
913 struct module
*owner
;
914 int (*load_super
)(struct md_rdev
*rdev
,
915 struct md_rdev
*refdev
,
917 int (*validate_super
)(struct mddev
*mddev
,
918 struct md_rdev
*rdev
);
919 void (*sync_super
)(struct mddev
*mddev
,
920 struct md_rdev
*rdev
);
921 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
922 sector_t num_sectors
);
923 int (*allow_new_offset
)(struct md_rdev
*rdev
,
924 unsigned long long new_offset
);
928 * Check that the given mddev has no bitmap.
930 * This function is called from the run method of all personalities that do not
931 * support bitmaps. It prints an error message and returns non-zero if mddev
932 * has a bitmap. Otherwise, it returns 0.
935 int md_check_no_bitmap(struct mddev
*mddev
)
937 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
939 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
940 mdname(mddev
), mddev
->pers
->name
);
943 EXPORT_SYMBOL(md_check_no_bitmap
);
946 * load_super for 0.90.0
948 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
950 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
955 * Calculate the position of the superblock (512byte sectors),
956 * it's at the end of the disk.
958 * It also happens to be a multiple of 4Kb.
960 rdev
->sb_start
= calc_dev_sboffset(rdev
);
962 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
967 bdevname(rdev
->bdev
, b
);
968 sb
= page_address(rdev
->sb_page
);
970 if (sb
->md_magic
!= MD_SB_MAGIC
) {
971 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
976 if (sb
->major_version
!= 0 ||
977 sb
->minor_version
< 90 ||
978 sb
->minor_version
> 91) {
979 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
980 sb
->major_version
, sb
->minor_version
,
985 if (sb
->raid_disks
<= 0)
988 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
989 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
994 rdev
->preferred_minor
= sb
->md_minor
;
995 rdev
->data_offset
= 0;
996 rdev
->new_data_offset
= 0;
997 rdev
->sb_size
= MD_SB_BYTES
;
998 rdev
->badblocks
.shift
= -1;
1000 if (sb
->level
== LEVEL_MULTIPATH
)
1003 rdev
->desc_nr
= sb
->this_disk
.number
;
1009 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1010 if (!uuid_equal(refsb
, sb
)) {
1011 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1012 b
, bdevname(refdev
->bdev
,b2
));
1015 if (!sb_equal(refsb
, sb
)) {
1016 printk(KERN_WARNING
"md: %s has same UUID"
1017 " but different superblock to %s\n",
1018 b
, bdevname(refdev
->bdev
, b2
));
1022 ev2
= md_event(refsb
);
1028 rdev
->sectors
= rdev
->sb_start
;
1029 /* Limit to 4TB as metadata cannot record more than that.
1030 * (not needed for Linear and RAID0 as metadata doesn't
1033 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1034 rdev
->sectors
= (2ULL << 32) - 2;
1036 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1037 /* "this cannot possibly happen" ... */
1045 * validate_super for 0.90.0
1047 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1050 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1051 __u64 ev1
= md_event(sb
);
1053 rdev
->raid_disk
= -1;
1054 clear_bit(Faulty
, &rdev
->flags
);
1055 clear_bit(In_sync
, &rdev
->flags
);
1056 clear_bit(Bitmap_sync
, &rdev
->flags
);
1057 clear_bit(WriteMostly
, &rdev
->flags
);
1059 if (mddev
->raid_disks
== 0) {
1060 mddev
->major_version
= 0;
1061 mddev
->minor_version
= sb
->minor_version
;
1062 mddev
->patch_version
= sb
->patch_version
;
1063 mddev
->external
= 0;
1064 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1065 mddev
->ctime
= sb
->ctime
;
1066 mddev
->utime
= sb
->utime
;
1067 mddev
->level
= sb
->level
;
1068 mddev
->clevel
[0] = 0;
1069 mddev
->layout
= sb
->layout
;
1070 mddev
->raid_disks
= sb
->raid_disks
;
1071 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1072 mddev
->events
= ev1
;
1073 mddev
->bitmap_info
.offset
= 0;
1074 mddev
->bitmap_info
.space
= 0;
1075 /* bitmap can use 60 K after the 4K superblocks */
1076 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1077 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1078 mddev
->reshape_backwards
= 0;
1080 if (mddev
->minor_version
>= 91) {
1081 mddev
->reshape_position
= sb
->reshape_position
;
1082 mddev
->delta_disks
= sb
->delta_disks
;
1083 mddev
->new_level
= sb
->new_level
;
1084 mddev
->new_layout
= sb
->new_layout
;
1085 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1086 if (mddev
->delta_disks
< 0)
1087 mddev
->reshape_backwards
= 1;
1089 mddev
->reshape_position
= MaxSector
;
1090 mddev
->delta_disks
= 0;
1091 mddev
->new_level
= mddev
->level
;
1092 mddev
->new_layout
= mddev
->layout
;
1093 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1096 if (sb
->state
& (1<<MD_SB_CLEAN
))
1097 mddev
->recovery_cp
= MaxSector
;
1099 if (sb
->events_hi
== sb
->cp_events_hi
&&
1100 sb
->events_lo
== sb
->cp_events_lo
) {
1101 mddev
->recovery_cp
= sb
->recovery_cp
;
1103 mddev
->recovery_cp
= 0;
1106 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1107 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1108 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1109 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1111 mddev
->max_disks
= MD_SB_DISKS
;
1113 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1114 mddev
->bitmap_info
.file
== NULL
) {
1115 mddev
->bitmap_info
.offset
=
1116 mddev
->bitmap_info
.default_offset
;
1117 mddev
->bitmap_info
.space
=
1118 mddev
->bitmap_info
.default_space
;
1121 } else if (mddev
->pers
== NULL
) {
1122 /* Insist on good event counter while assembling, except
1123 * for spares (which don't need an event count) */
1125 if (sb
->disks
[rdev
->desc_nr
].state
& (
1126 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1127 if (ev1
< mddev
->events
)
1129 } else if (mddev
->bitmap
) {
1130 /* if adding to array with a bitmap, then we can accept an
1131 * older device ... but not too old.
1133 if (ev1
< mddev
->bitmap
->events_cleared
)
1135 if (ev1
< mddev
->events
)
1136 set_bit(Bitmap_sync
, &rdev
->flags
);
1138 if (ev1
< mddev
->events
)
1139 /* just a hot-add of a new device, leave raid_disk at -1 */
1143 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1144 desc
= sb
->disks
+ rdev
->desc_nr
;
1146 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1147 set_bit(Faulty
, &rdev
->flags
);
1148 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1149 desc->raid_disk < mddev->raid_disks */) {
1150 set_bit(In_sync
, &rdev
->flags
);
1151 rdev
->raid_disk
= desc
->raid_disk
;
1152 rdev
->saved_raid_disk
= desc
->raid_disk
;
1153 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1154 /* active but not in sync implies recovery up to
1155 * reshape position. We don't know exactly where
1156 * that is, so set to zero for now */
1157 if (mddev
->minor_version
>= 91) {
1158 rdev
->recovery_offset
= 0;
1159 rdev
->raid_disk
= desc
->raid_disk
;
1162 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1163 set_bit(WriteMostly
, &rdev
->flags
);
1164 } else /* MULTIPATH are always insync */
1165 set_bit(In_sync
, &rdev
->flags
);
1170 * sync_super for 0.90.0
1172 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1175 struct md_rdev
*rdev2
;
1176 int next_spare
= mddev
->raid_disks
;
1178 /* make rdev->sb match mddev data..
1181 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1182 * 3/ any empty disks < next_spare become removed
1184 * disks[0] gets initialised to REMOVED because
1185 * we cannot be sure from other fields if it has
1186 * been initialised or not.
1189 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1191 rdev
->sb_size
= MD_SB_BYTES
;
1193 sb
= page_address(rdev
->sb_page
);
1195 memset(sb
, 0, sizeof(*sb
));
1197 sb
->md_magic
= MD_SB_MAGIC
;
1198 sb
->major_version
= mddev
->major_version
;
1199 sb
->patch_version
= mddev
->patch_version
;
1200 sb
->gvalid_words
= 0; /* ignored */
1201 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1202 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1203 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1204 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1206 sb
->ctime
= mddev
->ctime
;
1207 sb
->level
= mddev
->level
;
1208 sb
->size
= mddev
->dev_sectors
/ 2;
1209 sb
->raid_disks
= mddev
->raid_disks
;
1210 sb
->md_minor
= mddev
->md_minor
;
1211 sb
->not_persistent
= 0;
1212 sb
->utime
= mddev
->utime
;
1214 sb
->events_hi
= (mddev
->events
>>32);
1215 sb
->events_lo
= (u32
)mddev
->events
;
1217 if (mddev
->reshape_position
== MaxSector
)
1218 sb
->minor_version
= 90;
1220 sb
->minor_version
= 91;
1221 sb
->reshape_position
= mddev
->reshape_position
;
1222 sb
->new_level
= mddev
->new_level
;
1223 sb
->delta_disks
= mddev
->delta_disks
;
1224 sb
->new_layout
= mddev
->new_layout
;
1225 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1227 mddev
->minor_version
= sb
->minor_version
;
1230 sb
->recovery_cp
= mddev
->recovery_cp
;
1231 sb
->cp_events_hi
= (mddev
->events
>>32);
1232 sb
->cp_events_lo
= (u32
)mddev
->events
;
1233 if (mddev
->recovery_cp
== MaxSector
)
1234 sb
->state
= (1<< MD_SB_CLEAN
);
1236 sb
->recovery_cp
= 0;
1238 sb
->layout
= mddev
->layout
;
1239 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1241 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1242 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1244 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1245 rdev_for_each(rdev2
, mddev
) {
1248 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1250 if (rdev2
->raid_disk
>= 0 &&
1251 sb
->minor_version
>= 91)
1252 /* we have nowhere to store the recovery_offset,
1253 * but if it is not below the reshape_position,
1254 * we can piggy-back on that.
1257 if (rdev2
->raid_disk
< 0 ||
1258 test_bit(Faulty
, &rdev2
->flags
))
1261 desc_nr
= rdev2
->raid_disk
;
1263 desc_nr
= next_spare
++;
1264 rdev2
->desc_nr
= desc_nr
;
1265 d
= &sb
->disks
[rdev2
->desc_nr
];
1267 d
->number
= rdev2
->desc_nr
;
1268 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1269 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1271 d
->raid_disk
= rdev2
->raid_disk
;
1273 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1274 if (test_bit(Faulty
, &rdev2
->flags
))
1275 d
->state
= (1<<MD_DISK_FAULTY
);
1276 else if (is_active
) {
1277 d
->state
= (1<<MD_DISK_ACTIVE
);
1278 if (test_bit(In_sync
, &rdev2
->flags
))
1279 d
->state
|= (1<<MD_DISK_SYNC
);
1287 if (test_bit(WriteMostly
, &rdev2
->flags
))
1288 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1290 /* now set the "removed" and "faulty" bits on any missing devices */
1291 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1292 mdp_disk_t
*d
= &sb
->disks
[i
];
1293 if (d
->state
== 0 && d
->number
== 0) {
1296 d
->state
= (1<<MD_DISK_REMOVED
);
1297 d
->state
|= (1<<MD_DISK_FAULTY
);
1301 sb
->nr_disks
= nr_disks
;
1302 sb
->active_disks
= active
;
1303 sb
->working_disks
= working
;
1304 sb
->failed_disks
= failed
;
1305 sb
->spare_disks
= spare
;
1307 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1308 sb
->sb_csum
= calc_sb_csum(sb
);
1312 * rdev_size_change for 0.90.0
1314 static unsigned long long
1315 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1317 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1318 return 0; /* component must fit device */
1319 if (rdev
->mddev
->bitmap_info
.offset
)
1320 return 0; /* can't move bitmap */
1321 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1322 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1323 num_sectors
= rdev
->sb_start
;
1324 /* Limit to 4TB as metadata cannot record more than that.
1325 * 4TB == 2^32 KB, or 2*2^32 sectors.
1327 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1328 num_sectors
= (2ULL << 32) - 2;
1329 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1331 md_super_wait(rdev
->mddev
);
1336 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1338 /* non-zero offset changes not possible with v0.90 */
1339 return new_offset
== 0;
1343 * version 1 superblock
1346 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1350 unsigned long long newcsum
;
1351 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1352 __le32
*isuper
= (__le32
*)sb
;
1354 disk_csum
= sb
->sb_csum
;
1357 for (; size
>= 4; size
-= 4)
1358 newcsum
+= le32_to_cpu(*isuper
++);
1361 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1363 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1364 sb
->sb_csum
= disk_csum
;
1365 return cpu_to_le32(csum
);
1368 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1370 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1372 struct mdp_superblock_1
*sb
;
1376 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1380 * Calculate the position of the superblock in 512byte sectors.
1381 * It is always aligned to a 4K boundary and
1382 * depeding on minor_version, it can be:
1383 * 0: At least 8K, but less than 12K, from end of device
1384 * 1: At start of device
1385 * 2: 4K from start of device.
1387 switch(minor_version
) {
1389 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1391 sb_start
&= ~(sector_t
)(4*2-1);
1402 rdev
->sb_start
= sb_start
;
1404 /* superblock is rarely larger than 1K, but it can be larger,
1405 * and it is safe to read 4k, so we do that
1407 ret
= read_disk_sb(rdev
, 4096);
1408 if (ret
) return ret
;
1410 sb
= page_address(rdev
->sb_page
);
1412 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1413 sb
->major_version
!= cpu_to_le32(1) ||
1414 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1415 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1416 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1419 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1420 printk("md: invalid superblock checksum on %s\n",
1421 bdevname(rdev
->bdev
,b
));
1424 if (le64_to_cpu(sb
->data_size
) < 10) {
1425 printk("md: data_size too small on %s\n",
1426 bdevname(rdev
->bdev
,b
));
1431 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1432 /* Some padding is non-zero, might be a new feature */
1435 rdev
->preferred_minor
= 0xffff;
1436 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1437 rdev
->new_data_offset
= rdev
->data_offset
;
1438 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1439 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1440 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1441 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1443 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1444 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1445 if (rdev
->sb_size
& bmask
)
1446 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1449 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1452 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1455 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1458 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1460 if (!rdev
->bb_page
) {
1461 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1465 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1466 rdev
->badblocks
.count
== 0) {
1467 /* need to load the bad block list.
1468 * Currently we limit it to one page.
1474 int sectors
= le16_to_cpu(sb
->bblog_size
);
1475 if (sectors
> (PAGE_SIZE
/ 512))
1477 offset
= le32_to_cpu(sb
->bblog_offset
);
1480 bb_sector
= (long long)offset
;
1481 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1482 rdev
->bb_page
, READ
, true))
1484 bbp
= (u64
*)page_address(rdev
->bb_page
);
1485 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1486 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1487 u64 bb
= le64_to_cpu(*bbp
);
1488 int count
= bb
& (0x3ff);
1489 u64 sector
= bb
>> 10;
1490 sector
<<= sb
->bblog_shift
;
1491 count
<<= sb
->bblog_shift
;
1494 if (md_set_badblocks(&rdev
->badblocks
,
1495 sector
, count
, 1) == 0)
1498 } else if (sb
->bblog_offset
!= 0)
1499 rdev
->badblocks
.shift
= 0;
1505 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1507 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1508 sb
->level
!= refsb
->level
||
1509 sb
->layout
!= refsb
->layout
||
1510 sb
->chunksize
!= refsb
->chunksize
) {
1511 printk(KERN_WARNING
"md: %s has strangely different"
1512 " superblock to %s\n",
1513 bdevname(rdev
->bdev
,b
),
1514 bdevname(refdev
->bdev
,b2
));
1517 ev1
= le64_to_cpu(sb
->events
);
1518 ev2
= le64_to_cpu(refsb
->events
);
1525 if (minor_version
) {
1526 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1527 sectors
-= rdev
->data_offset
;
1529 sectors
= rdev
->sb_start
;
1530 if (sectors
< le64_to_cpu(sb
->data_size
))
1532 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1536 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1538 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1539 __u64 ev1
= le64_to_cpu(sb
->events
);
1541 rdev
->raid_disk
= -1;
1542 clear_bit(Faulty
, &rdev
->flags
);
1543 clear_bit(In_sync
, &rdev
->flags
);
1544 clear_bit(Bitmap_sync
, &rdev
->flags
);
1545 clear_bit(WriteMostly
, &rdev
->flags
);
1547 if (mddev
->raid_disks
== 0) {
1548 mddev
->major_version
= 1;
1549 mddev
->patch_version
= 0;
1550 mddev
->external
= 0;
1551 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1552 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1553 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1554 mddev
->level
= le32_to_cpu(sb
->level
);
1555 mddev
->clevel
[0] = 0;
1556 mddev
->layout
= le32_to_cpu(sb
->layout
);
1557 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1558 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1559 mddev
->events
= ev1
;
1560 mddev
->bitmap_info
.offset
= 0;
1561 mddev
->bitmap_info
.space
= 0;
1562 /* Default location for bitmap is 1K after superblock
1563 * using 3K - total of 4K
1565 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1566 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1567 mddev
->reshape_backwards
= 0;
1569 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1570 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1572 mddev
->max_disks
= (4096-256)/2;
1574 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1575 mddev
->bitmap_info
.file
== NULL
) {
1576 mddev
->bitmap_info
.offset
=
1577 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1578 /* Metadata doesn't record how much space is available.
1579 * For 1.0, we assume we can use up to the superblock
1580 * if before, else to 4K beyond superblock.
1581 * For others, assume no change is possible.
1583 if (mddev
->minor_version
> 0)
1584 mddev
->bitmap_info
.space
= 0;
1585 else if (mddev
->bitmap_info
.offset
> 0)
1586 mddev
->bitmap_info
.space
=
1587 8 - mddev
->bitmap_info
.offset
;
1589 mddev
->bitmap_info
.space
=
1590 -mddev
->bitmap_info
.offset
;
1593 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1594 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1595 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1596 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1597 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1598 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1599 if (mddev
->delta_disks
< 0 ||
1600 (mddev
->delta_disks
== 0 &&
1601 (le32_to_cpu(sb
->feature_map
)
1602 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1603 mddev
->reshape_backwards
= 1;
1605 mddev
->reshape_position
= MaxSector
;
1606 mddev
->delta_disks
= 0;
1607 mddev
->new_level
= mddev
->level
;
1608 mddev
->new_layout
= mddev
->layout
;
1609 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1612 } else if (mddev
->pers
== NULL
) {
1613 /* Insist of good event counter while assembling, except for
1614 * spares (which don't need an event count) */
1616 if (rdev
->desc_nr
>= 0 &&
1617 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1618 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1619 if (ev1
< mddev
->events
)
1621 } else if (mddev
->bitmap
) {
1622 /* If adding to array with a bitmap, then we can accept an
1623 * older device, but not too old.
1625 if (ev1
< mddev
->bitmap
->events_cleared
)
1627 if (ev1
< mddev
->events
)
1628 set_bit(Bitmap_sync
, &rdev
->flags
);
1630 if (ev1
< mddev
->events
)
1631 /* just a hot-add of a new device, leave raid_disk at -1 */
1634 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1636 if (rdev
->desc_nr
< 0 ||
1637 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1641 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1643 case 0xffff: /* spare */
1645 case 0xfffe: /* faulty */
1646 set_bit(Faulty
, &rdev
->flags
);
1649 rdev
->saved_raid_disk
= role
;
1650 if ((le32_to_cpu(sb
->feature_map
) &
1651 MD_FEATURE_RECOVERY_OFFSET
)) {
1652 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1653 if (!(le32_to_cpu(sb
->feature_map
) &
1654 MD_FEATURE_RECOVERY_BITMAP
))
1655 rdev
->saved_raid_disk
= -1;
1657 set_bit(In_sync
, &rdev
->flags
);
1658 rdev
->raid_disk
= role
;
1661 if (sb
->devflags
& WriteMostly1
)
1662 set_bit(WriteMostly
, &rdev
->flags
);
1663 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1664 set_bit(Replacement
, &rdev
->flags
);
1665 } else /* MULTIPATH are always insync */
1666 set_bit(In_sync
, &rdev
->flags
);
1671 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1673 struct mdp_superblock_1
*sb
;
1674 struct md_rdev
*rdev2
;
1676 /* make rdev->sb match mddev and rdev data. */
1678 sb
= page_address(rdev
->sb_page
);
1680 sb
->feature_map
= 0;
1682 sb
->recovery_offset
= cpu_to_le64(0);
1683 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1685 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1686 sb
->events
= cpu_to_le64(mddev
->events
);
1688 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1690 sb
->resync_offset
= cpu_to_le64(0);
1692 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1694 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1695 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1696 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1697 sb
->level
= cpu_to_le32(mddev
->level
);
1698 sb
->layout
= cpu_to_le32(mddev
->layout
);
1700 if (test_bit(WriteMostly
, &rdev
->flags
))
1701 sb
->devflags
|= WriteMostly1
;
1703 sb
->devflags
&= ~WriteMostly1
;
1704 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1705 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1707 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1708 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1709 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1712 if (rdev
->raid_disk
>= 0 &&
1713 !test_bit(In_sync
, &rdev
->flags
)) {
1715 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1716 sb
->recovery_offset
=
1717 cpu_to_le64(rdev
->recovery_offset
);
1718 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1720 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1722 if (test_bit(Replacement
, &rdev
->flags
))
1724 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1726 if (mddev
->reshape_position
!= MaxSector
) {
1727 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1728 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1729 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1730 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1731 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1732 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1733 if (mddev
->delta_disks
== 0 &&
1734 mddev
->reshape_backwards
)
1736 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1737 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1739 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1740 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1741 - rdev
->data_offset
));
1745 if (rdev
->badblocks
.count
== 0)
1746 /* Nothing to do for bad blocks*/ ;
1747 else if (sb
->bblog_offset
== 0)
1748 /* Cannot record bad blocks on this device */
1749 md_error(mddev
, rdev
);
1751 struct badblocks
*bb
= &rdev
->badblocks
;
1752 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1754 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1759 seq
= read_seqbegin(&bb
->lock
);
1761 memset(bbp
, 0xff, PAGE_SIZE
);
1763 for (i
= 0 ; i
< bb
->count
; i
++) {
1764 u64 internal_bb
= p
[i
];
1765 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1766 | BB_LEN(internal_bb
));
1767 bbp
[i
] = cpu_to_le64(store_bb
);
1770 if (read_seqretry(&bb
->lock
, seq
))
1773 bb
->sector
= (rdev
->sb_start
+
1774 (int)le32_to_cpu(sb
->bblog_offset
));
1775 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1780 rdev_for_each(rdev2
, mddev
)
1781 if (rdev2
->desc_nr
+1 > max_dev
)
1782 max_dev
= rdev2
->desc_nr
+1;
1784 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1786 sb
->max_dev
= cpu_to_le32(max_dev
);
1787 rdev
->sb_size
= max_dev
* 2 + 256;
1788 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1789 if (rdev
->sb_size
& bmask
)
1790 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1792 max_dev
= le32_to_cpu(sb
->max_dev
);
1794 for (i
=0; i
<max_dev
;i
++)
1795 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1797 rdev_for_each(rdev2
, mddev
) {
1799 if (test_bit(Faulty
, &rdev2
->flags
))
1800 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1801 else if (test_bit(In_sync
, &rdev2
->flags
))
1802 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1803 else if (rdev2
->raid_disk
>= 0)
1804 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1806 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1809 sb
->sb_csum
= calc_sb_1_csum(sb
);
1812 static unsigned long long
1813 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1815 struct mdp_superblock_1
*sb
;
1816 sector_t max_sectors
;
1817 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1818 return 0; /* component must fit device */
1819 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1820 return 0; /* too confusing */
1821 if (rdev
->sb_start
< rdev
->data_offset
) {
1822 /* minor versions 1 and 2; superblock before data */
1823 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1824 max_sectors
-= rdev
->data_offset
;
1825 if (!num_sectors
|| num_sectors
> max_sectors
)
1826 num_sectors
= max_sectors
;
1827 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1828 /* minor version 0 with bitmap we can't move */
1831 /* minor version 0; superblock after data */
1833 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1834 sb_start
&= ~(sector_t
)(4*2 - 1);
1835 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1836 if (!num_sectors
|| num_sectors
> max_sectors
)
1837 num_sectors
= max_sectors
;
1838 rdev
->sb_start
= sb_start
;
1840 sb
= page_address(rdev
->sb_page
);
1841 sb
->data_size
= cpu_to_le64(num_sectors
);
1842 sb
->super_offset
= rdev
->sb_start
;
1843 sb
->sb_csum
= calc_sb_1_csum(sb
);
1844 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1846 md_super_wait(rdev
->mddev
);
1852 super_1_allow_new_offset(struct md_rdev
*rdev
,
1853 unsigned long long new_offset
)
1855 /* All necessary checks on new >= old have been done */
1856 struct bitmap
*bitmap
;
1857 if (new_offset
>= rdev
->data_offset
)
1860 /* with 1.0 metadata, there is no metadata to tread on
1861 * so we can always move back */
1862 if (rdev
->mddev
->minor_version
== 0)
1865 /* otherwise we must be sure not to step on
1866 * any metadata, so stay:
1867 * 36K beyond start of superblock
1868 * beyond end of badblocks
1869 * beyond write-intent bitmap
1871 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1873 bitmap
= rdev
->mddev
->bitmap
;
1874 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1875 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1876 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1878 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1884 static struct super_type super_types
[] = {
1887 .owner
= THIS_MODULE
,
1888 .load_super
= super_90_load
,
1889 .validate_super
= super_90_validate
,
1890 .sync_super
= super_90_sync
,
1891 .rdev_size_change
= super_90_rdev_size_change
,
1892 .allow_new_offset
= super_90_allow_new_offset
,
1896 .owner
= THIS_MODULE
,
1897 .load_super
= super_1_load
,
1898 .validate_super
= super_1_validate
,
1899 .sync_super
= super_1_sync
,
1900 .rdev_size_change
= super_1_rdev_size_change
,
1901 .allow_new_offset
= super_1_allow_new_offset
,
1905 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1907 if (mddev
->sync_super
) {
1908 mddev
->sync_super(mddev
, rdev
);
1912 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1914 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1917 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1919 struct md_rdev
*rdev
, *rdev2
;
1922 rdev_for_each_rcu(rdev
, mddev1
)
1923 rdev_for_each_rcu(rdev2
, mddev2
)
1924 if (rdev
->bdev
->bd_contains
==
1925 rdev2
->bdev
->bd_contains
) {
1933 static LIST_HEAD(pending_raid_disks
);
1936 * Try to register data integrity profile for an mddev
1938 * This is called when an array is started and after a disk has been kicked
1939 * from the array. It only succeeds if all working and active component devices
1940 * are integrity capable with matching profiles.
1942 int md_integrity_register(struct mddev
*mddev
)
1944 struct md_rdev
*rdev
, *reference
= NULL
;
1946 if (list_empty(&mddev
->disks
))
1947 return 0; /* nothing to do */
1948 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1949 return 0; /* shouldn't register, or already is */
1950 rdev_for_each(rdev
, mddev
) {
1951 /* skip spares and non-functional disks */
1952 if (test_bit(Faulty
, &rdev
->flags
))
1954 if (rdev
->raid_disk
< 0)
1957 /* Use the first rdev as the reference */
1961 /* does this rdev's profile match the reference profile? */
1962 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1963 rdev
->bdev
->bd_disk
) < 0)
1966 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1969 * All component devices are integrity capable and have matching
1970 * profiles, register the common profile for the md device.
1972 if (blk_integrity_register(mddev
->gendisk
,
1973 bdev_get_integrity(reference
->bdev
)) != 0) {
1974 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1978 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1979 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1980 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1986 EXPORT_SYMBOL(md_integrity_register
);
1988 /* Disable data integrity if non-capable/non-matching disk is being added */
1989 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1991 struct blk_integrity
*bi_rdev
;
1992 struct blk_integrity
*bi_mddev
;
1994 if (!mddev
->gendisk
)
1997 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1998 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2000 if (!bi_mddev
) /* nothing to do */
2002 if (rdev
->raid_disk
< 0) /* skip spares */
2004 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2005 rdev
->bdev
->bd_disk
) >= 0)
2007 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2008 blk_integrity_unregister(mddev
->gendisk
);
2010 EXPORT_SYMBOL(md_integrity_add_rdev
);
2012 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2014 char b
[BDEVNAME_SIZE
];
2019 /* prevent duplicates */
2020 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2023 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2024 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2025 rdev
->sectors
< mddev
->dev_sectors
)) {
2027 /* Cannot change size, so fail
2028 * If mddev->level <= 0, then we don't care
2029 * about aligning sizes (e.g. linear)
2031 if (mddev
->level
> 0)
2034 mddev
->dev_sectors
= rdev
->sectors
;
2037 /* Verify rdev->desc_nr is unique.
2038 * If it is -1, assign a free number, else
2039 * check number is not in use
2042 if (rdev
->desc_nr
< 0) {
2045 choice
= mddev
->raid_disks
;
2046 while (find_rdev_nr_rcu(mddev
, choice
))
2048 rdev
->desc_nr
= choice
;
2050 if (find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2056 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2057 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2058 mdname(mddev
), mddev
->max_disks
);
2061 bdevname(rdev
->bdev
,b
);
2062 while ( (s
=strchr(b
, '/')) != NULL
)
2065 rdev
->mddev
= mddev
;
2066 printk(KERN_INFO
"md: bind<%s>\n", b
);
2068 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2071 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2072 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2073 /* failure here is OK */;
2074 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2076 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2077 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2079 /* May as well allow recovery to be retried once */
2080 mddev
->recovery_disabled
++;
2085 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2090 static void md_delayed_delete(struct work_struct
*ws
)
2092 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2093 kobject_del(&rdev
->kobj
);
2094 kobject_put(&rdev
->kobj
);
2097 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2099 char b
[BDEVNAME_SIZE
];
2101 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2102 list_del_rcu(&rdev
->same_set
);
2103 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2105 sysfs_remove_link(&rdev
->kobj
, "block");
2106 sysfs_put(rdev
->sysfs_state
);
2107 rdev
->sysfs_state
= NULL
;
2108 rdev
->badblocks
.count
= 0;
2109 /* We need to delay this, otherwise we can deadlock when
2110 * writing to 'remove' to "dev/state". We also need
2111 * to delay it due to rcu usage.
2114 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2115 kobject_get(&rdev
->kobj
);
2116 queue_work(md_misc_wq
, &rdev
->del_work
);
2120 * prevent the device from being mounted, repartitioned or
2121 * otherwise reused by a RAID array (or any other kernel
2122 * subsystem), by bd_claiming the device.
2124 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2127 struct block_device
*bdev
;
2128 char b
[BDEVNAME_SIZE
];
2130 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2131 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2133 printk(KERN_ERR
"md: could not open %s.\n",
2134 __bdevname(dev
, b
));
2135 return PTR_ERR(bdev
);
2141 static void unlock_rdev(struct md_rdev
*rdev
)
2143 struct block_device
*bdev
= rdev
->bdev
;
2145 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2148 void md_autodetect_dev(dev_t dev
);
2150 static void export_rdev(struct md_rdev
*rdev
)
2152 char b
[BDEVNAME_SIZE
];
2154 printk(KERN_INFO
"md: export_rdev(%s)\n",
2155 bdevname(rdev
->bdev
,b
));
2156 md_rdev_clear(rdev
);
2158 if (test_bit(AutoDetected
, &rdev
->flags
))
2159 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2162 kobject_put(&rdev
->kobj
);
2165 static void kick_rdev_from_array(struct md_rdev
*rdev
)
2167 unbind_rdev_from_array(rdev
);
2171 static void export_array(struct mddev
*mddev
)
2173 struct md_rdev
*rdev
;
2175 while (!list_empty(&mddev
->disks
)) {
2176 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2178 kick_rdev_from_array(rdev
);
2180 mddev
->raid_disks
= 0;
2181 mddev
->major_version
= 0;
2184 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2186 /* Update each superblock (in-memory image), but
2187 * if we are allowed to, skip spares which already
2188 * have the right event counter, or have one earlier
2189 * (which would mean they aren't being marked as dirty
2190 * with the rest of the array)
2192 struct md_rdev
*rdev
;
2193 rdev_for_each(rdev
, mddev
) {
2194 if (rdev
->sb_events
== mddev
->events
||
2196 rdev
->raid_disk
< 0 &&
2197 rdev
->sb_events
+1 == mddev
->events
)) {
2198 /* Don't update this superblock */
2199 rdev
->sb_loaded
= 2;
2201 sync_super(mddev
, rdev
);
2202 rdev
->sb_loaded
= 1;
2207 static void md_update_sb(struct mddev
*mddev
, int force_change
)
2209 struct md_rdev
*rdev
;
2212 int any_badblocks_changed
= 0;
2216 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2220 /* First make sure individual recovery_offsets are correct */
2221 rdev_for_each(rdev
, mddev
) {
2222 if (rdev
->raid_disk
>= 0 &&
2223 mddev
->delta_disks
>= 0 &&
2224 !test_bit(In_sync
, &rdev
->flags
) &&
2225 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2226 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2229 if (!mddev
->persistent
) {
2230 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2231 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2232 if (!mddev
->external
) {
2233 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2234 rdev_for_each(rdev
, mddev
) {
2235 if (rdev
->badblocks
.changed
) {
2236 rdev
->badblocks
.changed
= 0;
2237 md_ack_all_badblocks(&rdev
->badblocks
);
2238 md_error(mddev
, rdev
);
2240 clear_bit(Blocked
, &rdev
->flags
);
2241 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2242 wake_up(&rdev
->blocked_wait
);
2245 wake_up(&mddev
->sb_wait
);
2249 spin_lock(&mddev
->lock
);
2251 mddev
->utime
= get_seconds();
2253 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2255 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2256 /* just a clean<-> dirty transition, possibly leave spares alone,
2257 * though if events isn't the right even/odd, we will have to do
2263 if (mddev
->degraded
)
2264 /* If the array is degraded, then skipping spares is both
2265 * dangerous and fairly pointless.
2266 * Dangerous because a device that was removed from the array
2267 * might have a event_count that still looks up-to-date,
2268 * so it can be re-added without a resync.
2269 * Pointless because if there are any spares to skip,
2270 * then a recovery will happen and soon that array won't
2271 * be degraded any more and the spare can go back to sleep then.
2275 sync_req
= mddev
->in_sync
;
2277 /* If this is just a dirty<->clean transition, and the array is clean
2278 * and 'events' is odd, we can roll back to the previous clean state */
2280 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2281 && mddev
->can_decrease_events
2282 && mddev
->events
!= 1) {
2284 mddev
->can_decrease_events
= 0;
2286 /* otherwise we have to go forward and ... */
2288 mddev
->can_decrease_events
= nospares
;
2292 * This 64-bit counter should never wrap.
2293 * Either we are in around ~1 trillion A.C., assuming
2294 * 1 reboot per second, or we have a bug...
2296 WARN_ON(mddev
->events
== 0);
2298 rdev_for_each(rdev
, mddev
) {
2299 if (rdev
->badblocks
.changed
)
2300 any_badblocks_changed
++;
2301 if (test_bit(Faulty
, &rdev
->flags
))
2302 set_bit(FaultRecorded
, &rdev
->flags
);
2305 sync_sbs(mddev
, nospares
);
2306 spin_unlock(&mddev
->lock
);
2308 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2309 mdname(mddev
), mddev
->in_sync
);
2311 bitmap_update_sb(mddev
->bitmap
);
2312 rdev_for_each(rdev
, mddev
) {
2313 char b
[BDEVNAME_SIZE
];
2315 if (rdev
->sb_loaded
!= 1)
2316 continue; /* no noise on spare devices */
2318 if (!test_bit(Faulty
, &rdev
->flags
)) {
2319 md_super_write(mddev
,rdev
,
2320 rdev
->sb_start
, rdev
->sb_size
,
2322 pr_debug("md: (write) %s's sb offset: %llu\n",
2323 bdevname(rdev
->bdev
, b
),
2324 (unsigned long long)rdev
->sb_start
);
2325 rdev
->sb_events
= mddev
->events
;
2326 if (rdev
->badblocks
.size
) {
2327 md_super_write(mddev
, rdev
,
2328 rdev
->badblocks
.sector
,
2329 rdev
->badblocks
.size
<< 9,
2331 rdev
->badblocks
.size
= 0;
2335 pr_debug("md: %s (skipping faulty)\n",
2336 bdevname(rdev
->bdev
, b
));
2338 if (mddev
->level
== LEVEL_MULTIPATH
)
2339 /* only need to write one superblock... */
2342 md_super_wait(mddev
);
2343 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2345 spin_lock(&mddev
->lock
);
2346 if (mddev
->in_sync
!= sync_req
||
2347 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2348 /* have to write it out again */
2349 spin_unlock(&mddev
->lock
);
2352 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2353 spin_unlock(&mddev
->lock
);
2354 wake_up(&mddev
->sb_wait
);
2355 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2356 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2358 rdev_for_each(rdev
, mddev
) {
2359 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2360 clear_bit(Blocked
, &rdev
->flags
);
2362 if (any_badblocks_changed
)
2363 md_ack_all_badblocks(&rdev
->badblocks
);
2364 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2365 wake_up(&rdev
->blocked_wait
);
2369 /* words written to sysfs files may, or may not, be \n terminated.
2370 * We want to accept with case. For this we use cmd_match.
2372 static int cmd_match(const char *cmd
, const char *str
)
2374 /* See if cmd, written into a sysfs file, matches
2375 * str. They must either be the same, or cmd can
2376 * have a trailing newline
2378 while (*cmd
&& *str
&& *cmd
== *str
) {
2389 struct rdev_sysfs_entry
{
2390 struct attribute attr
;
2391 ssize_t (*show
)(struct md_rdev
*, char *);
2392 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2396 state_show(struct md_rdev
*rdev
, char *page
)
2400 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2402 if (test_bit(Faulty
, &flags
) ||
2403 rdev
->badblocks
.unacked_exist
) {
2404 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2407 if (test_bit(In_sync
, &flags
)) {
2408 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2411 if (test_bit(WriteMostly
, &flags
)) {
2412 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2415 if (test_bit(Blocked
, &flags
) ||
2416 (rdev
->badblocks
.unacked_exist
2417 && !test_bit(Faulty
, &flags
))) {
2418 len
+= sprintf(page
+len
, "%sblocked", sep
);
2421 if (!test_bit(Faulty
, &flags
) &&
2422 !test_bit(In_sync
, &flags
)) {
2423 len
+= sprintf(page
+len
, "%sspare", sep
);
2426 if (test_bit(WriteErrorSeen
, &flags
)) {
2427 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2430 if (test_bit(WantReplacement
, &flags
)) {
2431 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2434 if (test_bit(Replacement
, &flags
)) {
2435 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2439 return len
+sprintf(page
+len
, "\n");
2443 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2446 * faulty - simulates an error
2447 * remove - disconnects the device
2448 * writemostly - sets write_mostly
2449 * -writemostly - clears write_mostly
2450 * blocked - sets the Blocked flags
2451 * -blocked - clears the Blocked and possibly simulates an error
2452 * insync - sets Insync providing device isn't active
2453 * -insync - clear Insync for a device with a slot assigned,
2454 * so that it gets rebuilt based on bitmap
2455 * write_error - sets WriteErrorSeen
2456 * -write_error - clears WriteErrorSeen
2459 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2460 md_error(rdev
->mddev
, rdev
);
2461 if (test_bit(Faulty
, &rdev
->flags
))
2465 } else if (cmd_match(buf
, "remove")) {
2466 if (rdev
->raid_disk
>= 0)
2469 struct mddev
*mddev
= rdev
->mddev
;
2470 kick_rdev_from_array(rdev
);
2472 md_update_sb(mddev
, 1);
2473 md_new_event(mddev
);
2476 } else if (cmd_match(buf
, "writemostly")) {
2477 set_bit(WriteMostly
, &rdev
->flags
);
2479 } else if (cmd_match(buf
, "-writemostly")) {
2480 clear_bit(WriteMostly
, &rdev
->flags
);
2482 } else if (cmd_match(buf
, "blocked")) {
2483 set_bit(Blocked
, &rdev
->flags
);
2485 } else if (cmd_match(buf
, "-blocked")) {
2486 if (!test_bit(Faulty
, &rdev
->flags
) &&
2487 rdev
->badblocks
.unacked_exist
) {
2488 /* metadata handler doesn't understand badblocks,
2489 * so we need to fail the device
2491 md_error(rdev
->mddev
, rdev
);
2493 clear_bit(Blocked
, &rdev
->flags
);
2494 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2495 wake_up(&rdev
->blocked_wait
);
2496 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2497 md_wakeup_thread(rdev
->mddev
->thread
);
2500 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2501 set_bit(In_sync
, &rdev
->flags
);
2503 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2504 if (rdev
->mddev
->pers
== NULL
) {
2505 clear_bit(In_sync
, &rdev
->flags
);
2506 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2507 rdev
->raid_disk
= -1;
2510 } else if (cmd_match(buf
, "write_error")) {
2511 set_bit(WriteErrorSeen
, &rdev
->flags
);
2513 } else if (cmd_match(buf
, "-write_error")) {
2514 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2516 } else if (cmd_match(buf
, "want_replacement")) {
2517 /* Any non-spare device that is not a replacement can
2518 * become want_replacement at any time, but we then need to
2519 * check if recovery is needed.
2521 if (rdev
->raid_disk
>= 0 &&
2522 !test_bit(Replacement
, &rdev
->flags
))
2523 set_bit(WantReplacement
, &rdev
->flags
);
2524 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2525 md_wakeup_thread(rdev
->mddev
->thread
);
2527 } else if (cmd_match(buf
, "-want_replacement")) {
2528 /* Clearing 'want_replacement' is always allowed.
2529 * Once replacements starts it is too late though.
2532 clear_bit(WantReplacement
, &rdev
->flags
);
2533 } else if (cmd_match(buf
, "replacement")) {
2534 /* Can only set a device as a replacement when array has not
2535 * yet been started. Once running, replacement is automatic
2536 * from spares, or by assigning 'slot'.
2538 if (rdev
->mddev
->pers
)
2541 set_bit(Replacement
, &rdev
->flags
);
2544 } else if (cmd_match(buf
, "-replacement")) {
2545 /* Similarly, can only clear Replacement before start */
2546 if (rdev
->mddev
->pers
)
2549 clear_bit(Replacement
, &rdev
->flags
);
2554 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2555 return err
? err
: len
;
2557 static struct rdev_sysfs_entry rdev_state
=
2558 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2561 errors_show(struct md_rdev
*rdev
, char *page
)
2563 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2567 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2570 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2571 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2572 atomic_set(&rdev
->corrected_errors
, n
);
2577 static struct rdev_sysfs_entry rdev_errors
=
2578 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2581 slot_show(struct md_rdev
*rdev
, char *page
)
2583 if (rdev
->raid_disk
< 0)
2584 return sprintf(page
, "none\n");
2586 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2590 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2594 int slot
= simple_strtoul(buf
, &e
, 10);
2595 if (strncmp(buf
, "none", 4)==0)
2597 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2599 if (rdev
->mddev
->pers
&& slot
== -1) {
2600 /* Setting 'slot' on an active array requires also
2601 * updating the 'rd%d' link, and communicating
2602 * with the personality with ->hot_*_disk.
2603 * For now we only support removing
2604 * failed/spare devices. This normally happens automatically,
2605 * but not when the metadata is externally managed.
2607 if (rdev
->raid_disk
== -1)
2609 /* personality does all needed checks */
2610 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2612 clear_bit(Blocked
, &rdev
->flags
);
2613 remove_and_add_spares(rdev
->mddev
, rdev
);
2614 if (rdev
->raid_disk
>= 0)
2616 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2617 md_wakeup_thread(rdev
->mddev
->thread
);
2618 } else if (rdev
->mddev
->pers
) {
2619 /* Activating a spare .. or possibly reactivating
2620 * if we ever get bitmaps working here.
2623 if (rdev
->raid_disk
!= -1)
2626 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2629 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2632 if (slot
>= rdev
->mddev
->raid_disks
&&
2633 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2636 rdev
->raid_disk
= slot
;
2637 if (test_bit(In_sync
, &rdev
->flags
))
2638 rdev
->saved_raid_disk
= slot
;
2640 rdev
->saved_raid_disk
= -1;
2641 clear_bit(In_sync
, &rdev
->flags
);
2642 clear_bit(Bitmap_sync
, &rdev
->flags
);
2643 err
= rdev
->mddev
->pers
->
2644 hot_add_disk(rdev
->mddev
, rdev
);
2646 rdev
->raid_disk
= -1;
2649 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2650 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2651 /* failure here is OK */;
2652 /* don't wakeup anyone, leave that to userspace. */
2654 if (slot
>= rdev
->mddev
->raid_disks
&&
2655 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2657 rdev
->raid_disk
= slot
;
2658 /* assume it is working */
2659 clear_bit(Faulty
, &rdev
->flags
);
2660 clear_bit(WriteMostly
, &rdev
->flags
);
2661 set_bit(In_sync
, &rdev
->flags
);
2662 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2667 static struct rdev_sysfs_entry rdev_slot
=
2668 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2671 offset_show(struct md_rdev
*rdev
, char *page
)
2673 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2677 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2679 unsigned long long offset
;
2680 if (kstrtoull(buf
, 10, &offset
) < 0)
2682 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2684 if (rdev
->sectors
&& rdev
->mddev
->external
)
2685 /* Must set offset before size, so overlap checks
2688 rdev
->data_offset
= offset
;
2689 rdev
->new_data_offset
= offset
;
2693 static struct rdev_sysfs_entry rdev_offset
=
2694 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2696 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2698 return sprintf(page
, "%llu\n",
2699 (unsigned long long)rdev
->new_data_offset
);
2702 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2703 const char *buf
, size_t len
)
2705 unsigned long long new_offset
;
2706 struct mddev
*mddev
= rdev
->mddev
;
2708 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2711 if (mddev
->sync_thread
||
2712 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2714 if (new_offset
== rdev
->data_offset
)
2715 /* reset is always permitted */
2717 else if (new_offset
> rdev
->data_offset
) {
2718 /* must not push array size beyond rdev_sectors */
2719 if (new_offset
- rdev
->data_offset
2720 + mddev
->dev_sectors
> rdev
->sectors
)
2723 /* Metadata worries about other space details. */
2725 /* decreasing the offset is inconsistent with a backwards
2728 if (new_offset
< rdev
->data_offset
&&
2729 mddev
->reshape_backwards
)
2731 /* Increasing offset is inconsistent with forwards
2732 * reshape. reshape_direction should be set to
2733 * 'backwards' first.
2735 if (new_offset
> rdev
->data_offset
&&
2736 !mddev
->reshape_backwards
)
2739 if (mddev
->pers
&& mddev
->persistent
&&
2740 !super_types
[mddev
->major_version
]
2741 .allow_new_offset(rdev
, new_offset
))
2743 rdev
->new_data_offset
= new_offset
;
2744 if (new_offset
> rdev
->data_offset
)
2745 mddev
->reshape_backwards
= 1;
2746 else if (new_offset
< rdev
->data_offset
)
2747 mddev
->reshape_backwards
= 0;
2751 static struct rdev_sysfs_entry rdev_new_offset
=
2752 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2755 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2757 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2760 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2762 /* check if two start/length pairs overlap */
2770 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2772 unsigned long long blocks
;
2775 if (kstrtoull(buf
, 10, &blocks
) < 0)
2778 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2779 return -EINVAL
; /* sector conversion overflow */
2782 if (new != blocks
* 2)
2783 return -EINVAL
; /* unsigned long long to sector_t overflow */
2790 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2792 struct mddev
*my_mddev
= rdev
->mddev
;
2793 sector_t oldsectors
= rdev
->sectors
;
2796 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2798 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2799 return -EINVAL
; /* too confusing */
2800 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2801 if (my_mddev
->persistent
) {
2802 sectors
= super_types
[my_mddev
->major_version
].
2803 rdev_size_change(rdev
, sectors
);
2806 } else if (!sectors
)
2807 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2809 if (!my_mddev
->pers
->resize
)
2810 /* Cannot change size for RAID0 or Linear etc */
2813 if (sectors
< my_mddev
->dev_sectors
)
2814 return -EINVAL
; /* component must fit device */
2816 rdev
->sectors
= sectors
;
2817 if (sectors
> oldsectors
&& my_mddev
->external
) {
2818 /* Need to check that all other rdevs with the same
2819 * ->bdev do not overlap. 'rcu' is sufficient to walk
2820 * the rdev lists safely.
2821 * This check does not provide a hard guarantee, it
2822 * just helps avoid dangerous mistakes.
2824 struct mddev
*mddev
;
2826 struct list_head
*tmp
;
2829 for_each_mddev(mddev
, tmp
) {
2830 struct md_rdev
*rdev2
;
2832 rdev_for_each(rdev2
, mddev
)
2833 if (rdev
->bdev
== rdev2
->bdev
&&
2835 overlaps(rdev
->data_offset
, rdev
->sectors
,
2848 /* Someone else could have slipped in a size
2849 * change here, but doing so is just silly.
2850 * We put oldsectors back because we *know* it is
2851 * safe, and trust userspace not to race with
2854 rdev
->sectors
= oldsectors
;
2861 static struct rdev_sysfs_entry rdev_size
=
2862 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2864 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2866 unsigned long long recovery_start
= rdev
->recovery_offset
;
2868 if (test_bit(In_sync
, &rdev
->flags
) ||
2869 recovery_start
== MaxSector
)
2870 return sprintf(page
, "none\n");
2872 return sprintf(page
, "%llu\n", recovery_start
);
2875 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2877 unsigned long long recovery_start
;
2879 if (cmd_match(buf
, "none"))
2880 recovery_start
= MaxSector
;
2881 else if (kstrtoull(buf
, 10, &recovery_start
))
2884 if (rdev
->mddev
->pers
&&
2885 rdev
->raid_disk
>= 0)
2888 rdev
->recovery_offset
= recovery_start
;
2889 if (recovery_start
== MaxSector
)
2890 set_bit(In_sync
, &rdev
->flags
);
2892 clear_bit(In_sync
, &rdev
->flags
);
2896 static struct rdev_sysfs_entry rdev_recovery_start
=
2897 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2900 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2902 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2904 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2906 return badblocks_show(&rdev
->badblocks
, page
, 0);
2908 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2910 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2911 /* Maybe that ack was all we needed */
2912 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2913 wake_up(&rdev
->blocked_wait
);
2916 static struct rdev_sysfs_entry rdev_bad_blocks
=
2917 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2919 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2921 return badblocks_show(&rdev
->badblocks
, page
, 1);
2923 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2925 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2927 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2928 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2930 static struct attribute
*rdev_default_attrs
[] = {
2935 &rdev_new_offset
.attr
,
2937 &rdev_recovery_start
.attr
,
2938 &rdev_bad_blocks
.attr
,
2939 &rdev_unack_bad_blocks
.attr
,
2943 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2945 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2946 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2952 return entry
->show(rdev
, page
);
2956 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2957 const char *page
, size_t length
)
2959 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2960 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2962 struct mddev
*mddev
= rdev
->mddev
;
2966 if (!capable(CAP_SYS_ADMIN
))
2968 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2970 if (rdev
->mddev
== NULL
)
2973 rv
= entry
->store(rdev
, page
, length
);
2974 mddev_unlock(mddev
);
2979 static void rdev_free(struct kobject
*ko
)
2981 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
2984 static const struct sysfs_ops rdev_sysfs_ops
= {
2985 .show
= rdev_attr_show
,
2986 .store
= rdev_attr_store
,
2988 static struct kobj_type rdev_ktype
= {
2989 .release
= rdev_free
,
2990 .sysfs_ops
= &rdev_sysfs_ops
,
2991 .default_attrs
= rdev_default_attrs
,
2994 int md_rdev_init(struct md_rdev
*rdev
)
2997 rdev
->saved_raid_disk
= -1;
2998 rdev
->raid_disk
= -1;
3000 rdev
->data_offset
= 0;
3001 rdev
->new_data_offset
= 0;
3002 rdev
->sb_events
= 0;
3003 rdev
->last_read_error
.tv_sec
= 0;
3004 rdev
->last_read_error
.tv_nsec
= 0;
3005 rdev
->sb_loaded
= 0;
3006 rdev
->bb_page
= NULL
;
3007 atomic_set(&rdev
->nr_pending
, 0);
3008 atomic_set(&rdev
->read_errors
, 0);
3009 atomic_set(&rdev
->corrected_errors
, 0);
3011 INIT_LIST_HEAD(&rdev
->same_set
);
3012 init_waitqueue_head(&rdev
->blocked_wait
);
3014 /* Add space to store bad block list.
3015 * This reserves the space even on arrays where it cannot
3016 * be used - I wonder if that matters
3018 rdev
->badblocks
.count
= 0;
3019 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3020 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3021 seqlock_init(&rdev
->badblocks
.lock
);
3022 if (rdev
->badblocks
.page
== NULL
)
3027 EXPORT_SYMBOL_GPL(md_rdev_init
);
3029 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3031 * mark the device faulty if:
3033 * - the device is nonexistent (zero size)
3034 * - the device has no valid superblock
3036 * a faulty rdev _never_ has rdev->sb set.
3038 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3040 char b
[BDEVNAME_SIZE
];
3042 struct md_rdev
*rdev
;
3045 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3047 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3048 return ERR_PTR(-ENOMEM
);
3051 err
= md_rdev_init(rdev
);
3054 err
= alloc_disk_sb(rdev
);
3058 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3062 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3064 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3067 "md: %s has zero or unknown size, marking faulty!\n",
3068 bdevname(rdev
->bdev
,b
));
3073 if (super_format
>= 0) {
3074 err
= super_types
[super_format
].
3075 load_super(rdev
, NULL
, super_minor
);
3076 if (err
== -EINVAL
) {
3078 "md: %s does not have a valid v%d.%d "
3079 "superblock, not importing!\n",
3080 bdevname(rdev
->bdev
,b
),
3081 super_format
, super_minor
);
3086 "md: could not read %s's sb, not importing!\n",
3087 bdevname(rdev
->bdev
,b
));
3097 md_rdev_clear(rdev
);
3099 return ERR_PTR(err
);
3103 * Check a full RAID array for plausibility
3106 static void analyze_sbs(struct mddev
*mddev
)
3109 struct md_rdev
*rdev
, *freshest
, *tmp
;
3110 char b
[BDEVNAME_SIZE
];
3113 rdev_for_each_safe(rdev
, tmp
, mddev
)
3114 switch (super_types
[mddev
->major_version
].
3115 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3123 "md: fatal superblock inconsistency in %s"
3124 " -- removing from array\n",
3125 bdevname(rdev
->bdev
,b
));
3126 kick_rdev_from_array(rdev
);
3129 super_types
[mddev
->major_version
].
3130 validate_super(mddev
, freshest
);
3133 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3134 if (mddev
->max_disks
&&
3135 (rdev
->desc_nr
>= mddev
->max_disks
||
3136 i
> mddev
->max_disks
)) {
3138 "md: %s: %s: only %d devices permitted\n",
3139 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3141 kick_rdev_from_array(rdev
);
3144 if (rdev
!= freshest
)
3145 if (super_types
[mddev
->major_version
].
3146 validate_super(mddev
, rdev
)) {
3147 printk(KERN_WARNING
"md: kicking non-fresh %s"
3149 bdevname(rdev
->bdev
,b
));
3150 kick_rdev_from_array(rdev
);
3153 if (mddev
->level
== LEVEL_MULTIPATH
) {
3154 rdev
->desc_nr
= i
++;
3155 rdev
->raid_disk
= rdev
->desc_nr
;
3156 set_bit(In_sync
, &rdev
->flags
);
3157 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3158 rdev
->raid_disk
= -1;
3159 clear_bit(In_sync
, &rdev
->flags
);
3164 /* Read a fixed-point number.
3165 * Numbers in sysfs attributes should be in "standard" units where
3166 * possible, so time should be in seconds.
3167 * However we internally use a a much smaller unit such as
3168 * milliseconds or jiffies.
3169 * This function takes a decimal number with a possible fractional
3170 * component, and produces an integer which is the result of
3171 * multiplying that number by 10^'scale'.
3172 * all without any floating-point arithmetic.
3174 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3176 unsigned long result
= 0;
3178 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3181 else if (decimals
< scale
) {
3184 result
= result
* 10 + value
;
3196 while (decimals
< scale
) {
3204 static void md_safemode_timeout(unsigned long data
);
3207 safe_delay_show(struct mddev
*mddev
, char *page
)
3209 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3210 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3213 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3217 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3220 mddev
->safemode_delay
= 0;
3222 unsigned long old_delay
= mddev
->safemode_delay
;
3223 unsigned long new_delay
= (msec
*HZ
)/1000;
3227 mddev
->safemode_delay
= new_delay
;
3228 if (new_delay
< old_delay
|| old_delay
== 0)
3229 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3233 static struct md_sysfs_entry md_safe_delay
=
3234 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3237 level_show(struct mddev
*mddev
, char *page
)
3239 struct md_personality
*p
;
3241 spin_lock(&mddev
->lock
);
3244 ret
= sprintf(page
, "%s\n", p
->name
);
3245 else if (mddev
->clevel
[0])
3246 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3247 else if (mddev
->level
!= LEVEL_NONE
)
3248 ret
= sprintf(page
, "%d\n", mddev
->level
);
3251 spin_unlock(&mddev
->lock
);
3256 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3260 struct md_personality
*pers
, *oldpers
;
3262 void *priv
, *oldpriv
;
3263 struct md_rdev
*rdev
;
3265 if (mddev
->pers
== NULL
) {
3268 if (len
>= sizeof(mddev
->clevel
))
3270 strncpy(mddev
->clevel
, buf
, len
);
3271 if (mddev
->clevel
[len
-1] == '\n')
3273 mddev
->clevel
[len
] = 0;
3274 mddev
->level
= LEVEL_NONE
;
3280 /* request to change the personality. Need to ensure:
3281 * - array is not engaged in resync/recovery/reshape
3282 * - old personality can be suspended
3283 * - new personality will access other array.
3286 if (mddev
->sync_thread
||
3287 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3288 mddev
->reshape_position
!= MaxSector
||
3289 mddev
->sysfs_active
)
3292 if (!mddev
->pers
->quiesce
) {
3293 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3294 mdname(mddev
), mddev
->pers
->name
);
3298 /* Now find the new personality */
3299 if (len
== 0 || len
>= sizeof(clevel
))
3301 strncpy(clevel
, buf
, len
);
3302 if (clevel
[len
-1] == '\n')
3305 if (kstrtol(clevel
, 10, &level
))
3308 if (request_module("md-%s", clevel
) != 0)
3309 request_module("md-level-%s", clevel
);
3310 spin_lock(&pers_lock
);
3311 pers
= find_pers(level
, clevel
);
3312 if (!pers
|| !try_module_get(pers
->owner
)) {
3313 spin_unlock(&pers_lock
);
3314 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3317 spin_unlock(&pers_lock
);
3319 if (pers
== mddev
->pers
) {
3320 /* Nothing to do! */
3321 module_put(pers
->owner
);
3324 if (!pers
->takeover
) {
3325 module_put(pers
->owner
);
3326 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3327 mdname(mddev
), clevel
);
3331 rdev_for_each(rdev
, mddev
)
3332 rdev
->new_raid_disk
= rdev
->raid_disk
;
3334 /* ->takeover must set new_* and/or delta_disks
3335 * if it succeeds, and may set them when it fails.
3337 priv
= pers
->takeover(mddev
);
3339 mddev
->new_level
= mddev
->level
;
3340 mddev
->new_layout
= mddev
->layout
;
3341 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3342 mddev
->raid_disks
-= mddev
->delta_disks
;
3343 mddev
->delta_disks
= 0;
3344 mddev
->reshape_backwards
= 0;
3345 module_put(pers
->owner
);
3346 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3347 mdname(mddev
), clevel
);
3348 return PTR_ERR(priv
);
3351 /* Looks like we have a winner */
3352 mddev_suspend(mddev
);
3353 mddev_detach(mddev
);
3355 spin_lock(&mddev
->lock
);
3356 oldpers
= mddev
->pers
;
3357 oldpriv
= mddev
->private;
3359 mddev
->private = priv
;
3360 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3361 mddev
->level
= mddev
->new_level
;
3362 mddev
->layout
= mddev
->new_layout
;
3363 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3364 mddev
->delta_disks
= 0;
3365 mddev
->reshape_backwards
= 0;
3366 mddev
->degraded
= 0;
3367 spin_unlock(&mddev
->lock
);
3369 if (oldpers
->sync_request
== NULL
&&
3371 /* We are converting from a no-redundancy array
3372 * to a redundancy array and metadata is managed
3373 * externally so we need to be sure that writes
3374 * won't block due to a need to transition
3376 * until external management is started.
3379 mddev
->safemode_delay
= 0;
3380 mddev
->safemode
= 0;
3383 oldpers
->free(mddev
, oldpriv
);
3385 if (oldpers
->sync_request
== NULL
&&
3386 pers
->sync_request
!= NULL
) {
3387 /* need to add the md_redundancy_group */
3388 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3390 "md: cannot register extra attributes for %s\n",
3392 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3394 if (oldpers
->sync_request
!= NULL
&&
3395 pers
->sync_request
== NULL
) {
3396 /* need to remove the md_redundancy_group */
3397 if (mddev
->to_remove
== NULL
)
3398 mddev
->to_remove
= &md_redundancy_group
;
3401 rdev_for_each(rdev
, mddev
) {
3402 if (rdev
->raid_disk
< 0)
3404 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3405 rdev
->new_raid_disk
= -1;
3406 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3408 sysfs_unlink_rdev(mddev
, rdev
);
3410 rdev_for_each(rdev
, mddev
) {
3411 if (rdev
->raid_disk
< 0)
3413 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3415 rdev
->raid_disk
= rdev
->new_raid_disk
;
3416 if (rdev
->raid_disk
< 0)
3417 clear_bit(In_sync
, &rdev
->flags
);
3419 if (sysfs_link_rdev(mddev
, rdev
))
3420 printk(KERN_WARNING
"md: cannot register rd%d"
3421 " for %s after level change\n",
3422 rdev
->raid_disk
, mdname(mddev
));
3426 if (pers
->sync_request
== NULL
) {
3427 /* this is now an array without redundancy, so
3428 * it must always be in_sync
3431 del_timer_sync(&mddev
->safemode_timer
);
3433 blk_set_stacking_limits(&mddev
->queue
->limits
);
3435 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3436 mddev_resume(mddev
);
3438 md_update_sb(mddev
, 1);
3439 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3440 md_new_event(mddev
);
3444 static struct md_sysfs_entry md_level
=
3445 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3448 layout_show(struct mddev
*mddev
, char *page
)
3450 /* just a number, not meaningful for all levels */
3451 if (mddev
->reshape_position
!= MaxSector
&&
3452 mddev
->layout
!= mddev
->new_layout
)
3453 return sprintf(page
, "%d (%d)\n",
3454 mddev
->new_layout
, mddev
->layout
);
3455 return sprintf(page
, "%d\n", mddev
->layout
);
3459 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3462 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3464 if (!*buf
|| (*e
&& *e
!= '\n'))
3469 if (mddev
->pers
->check_reshape
== NULL
)
3473 mddev
->new_layout
= n
;
3474 err
= mddev
->pers
->check_reshape(mddev
);
3476 mddev
->new_layout
= mddev
->layout
;
3480 mddev
->new_layout
= n
;
3481 if (mddev
->reshape_position
== MaxSector
)
3486 static struct md_sysfs_entry md_layout
=
3487 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3490 raid_disks_show(struct mddev
*mddev
, char *page
)
3492 if (mddev
->raid_disks
== 0)
3494 if (mddev
->reshape_position
!= MaxSector
&&
3495 mddev
->delta_disks
!= 0)
3496 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3497 mddev
->raid_disks
- mddev
->delta_disks
);
3498 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3501 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3504 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3508 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3510 if (!*buf
|| (*e
&& *e
!= '\n'))
3514 rv
= update_raid_disks(mddev
, n
);
3515 else if (mddev
->reshape_position
!= MaxSector
) {
3516 struct md_rdev
*rdev
;
3517 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3519 rdev_for_each(rdev
, mddev
) {
3521 rdev
->data_offset
< rdev
->new_data_offset
)
3524 rdev
->data_offset
> rdev
->new_data_offset
)
3527 mddev
->delta_disks
= n
- olddisks
;
3528 mddev
->raid_disks
= n
;
3529 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3531 mddev
->raid_disks
= n
;
3532 return rv
? rv
: len
;
3534 static struct md_sysfs_entry md_raid_disks
=
3535 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3538 chunk_size_show(struct mddev
*mddev
, char *page
)
3540 if (mddev
->reshape_position
!= MaxSector
&&
3541 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3542 return sprintf(page
, "%d (%d)\n",
3543 mddev
->new_chunk_sectors
<< 9,
3544 mddev
->chunk_sectors
<< 9);
3545 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3549 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3552 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3554 if (!*buf
|| (*e
&& *e
!= '\n'))
3559 if (mddev
->pers
->check_reshape
== NULL
)
3563 mddev
->new_chunk_sectors
= n
>> 9;
3564 err
= mddev
->pers
->check_reshape(mddev
);
3566 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3570 mddev
->new_chunk_sectors
= n
>> 9;
3571 if (mddev
->reshape_position
== MaxSector
)
3572 mddev
->chunk_sectors
= n
>> 9;
3576 static struct md_sysfs_entry md_chunk_size
=
3577 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3580 resync_start_show(struct mddev
*mddev
, char *page
)
3582 if (mddev
->recovery_cp
== MaxSector
)
3583 return sprintf(page
, "none\n");
3584 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3588 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3591 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3593 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3595 if (cmd_match(buf
, "none"))
3597 else if (!*buf
|| (*e
&& *e
!= '\n'))
3600 mddev
->recovery_cp
= n
;
3602 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3605 static struct md_sysfs_entry md_resync_start
=
3606 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3609 * The array state can be:
3612 * No devices, no size, no level
3613 * Equivalent to STOP_ARRAY ioctl
3615 * May have some settings, but array is not active
3616 * all IO results in error
3617 * When written, doesn't tear down array, but just stops it
3618 * suspended (not supported yet)
3619 * All IO requests will block. The array can be reconfigured.
3620 * Writing this, if accepted, will block until array is quiescent
3622 * no resync can happen. no superblocks get written.
3623 * write requests fail
3625 * like readonly, but behaves like 'clean' on a write request.
3627 * clean - no pending writes, but otherwise active.
3628 * When written to inactive array, starts without resync
3629 * If a write request arrives then
3630 * if metadata is known, mark 'dirty' and switch to 'active'.
3631 * if not known, block and switch to write-pending
3632 * If written to an active array that has pending writes, then fails.
3634 * fully active: IO and resync can be happening.
3635 * When written to inactive array, starts with resync
3638 * clean, but writes are blocked waiting for 'active' to be written.
3641 * like active, but no writes have been seen for a while (100msec).
3644 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3645 write_pending
, active_idle
, bad_word
};
3646 static char *array_states
[] = {
3647 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3648 "write-pending", "active-idle", NULL
};
3650 static int match_word(const char *word
, char **list
)
3653 for (n
=0; list
[n
]; n
++)
3654 if (cmd_match(word
, list
[n
]))
3660 array_state_show(struct mddev
*mddev
, char *page
)
3662 enum array_state st
= inactive
;
3675 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3677 else if (mddev
->safemode
)
3683 if (list_empty(&mddev
->disks
) &&
3684 mddev
->raid_disks
== 0 &&
3685 mddev
->dev_sectors
== 0)
3690 return sprintf(page
, "%s\n", array_states
[st
]);
3693 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3694 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3695 static int do_md_run(struct mddev
*mddev
);
3696 static int restart_array(struct mddev
*mddev
);
3699 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3702 enum array_state st
= match_word(buf
, array_states
);
3707 /* stopping an active array */
3708 err
= do_md_stop(mddev
, 0, NULL
);
3711 /* stopping an active array */
3713 err
= do_md_stop(mddev
, 2, NULL
);
3715 err
= 0; /* already inactive */
3718 break; /* not supported yet */
3721 err
= md_set_readonly(mddev
, NULL
);
3724 set_disk_ro(mddev
->gendisk
, 1);
3725 err
= do_md_run(mddev
);
3731 err
= md_set_readonly(mddev
, NULL
);
3732 else if (mddev
->ro
== 1)
3733 err
= restart_array(mddev
);
3736 set_disk_ro(mddev
->gendisk
, 0);
3740 err
= do_md_run(mddev
);
3745 restart_array(mddev
);
3746 spin_lock(&mddev
->lock
);
3747 if (atomic_read(&mddev
->writes_pending
) == 0) {
3748 if (mddev
->in_sync
== 0) {
3750 if (mddev
->safemode
== 1)
3751 mddev
->safemode
= 0;
3752 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3757 spin_unlock(&mddev
->lock
);
3763 restart_array(mddev
);
3764 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3765 wake_up(&mddev
->sb_wait
);
3769 set_disk_ro(mddev
->gendisk
, 0);
3770 err
= do_md_run(mddev
);
3775 /* these cannot be set */
3781 if (mddev
->hold_active
== UNTIL_IOCTL
)
3782 mddev
->hold_active
= 0;
3783 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3787 static struct md_sysfs_entry md_array_state
=
3788 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3791 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3792 return sprintf(page
, "%d\n",
3793 atomic_read(&mddev
->max_corr_read_errors
));
3797 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3800 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3802 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3803 atomic_set(&mddev
->max_corr_read_errors
, n
);
3809 static struct md_sysfs_entry max_corr_read_errors
=
3810 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3811 max_corrected_read_errors_store
);
3814 null_show(struct mddev
*mddev
, char *page
)
3820 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3822 /* buf must be %d:%d\n? giving major and minor numbers */
3823 /* The new device is added to the array.
3824 * If the array has a persistent superblock, we read the
3825 * superblock to initialise info and check validity.
3826 * Otherwise, only checking done is that in bind_rdev_to_array,
3827 * which mainly checks size.
3830 int major
= simple_strtoul(buf
, &e
, 10);
3833 struct md_rdev
*rdev
;
3836 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3838 minor
= simple_strtoul(e
+1, &e
, 10);
3839 if (*e
&& *e
!= '\n')
3841 dev
= MKDEV(major
, minor
);
3842 if (major
!= MAJOR(dev
) ||
3843 minor
!= MINOR(dev
))
3846 if (mddev
->persistent
) {
3847 rdev
= md_import_device(dev
, mddev
->major_version
,
3848 mddev
->minor_version
);
3849 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3850 struct md_rdev
*rdev0
3851 = list_entry(mddev
->disks
.next
,
3852 struct md_rdev
, same_set
);
3853 err
= super_types
[mddev
->major_version
]
3854 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3858 } else if (mddev
->external
)
3859 rdev
= md_import_device(dev
, -2, -1);
3861 rdev
= md_import_device(dev
, -1, -1);
3864 return PTR_ERR(rdev
);
3865 err
= bind_rdev_to_array(rdev
, mddev
);
3869 return err
? err
: len
;
3872 static struct md_sysfs_entry md_new_device
=
3873 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3876 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3879 unsigned long chunk
, end_chunk
;
3883 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3885 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3886 if (buf
== end
) break;
3887 if (*end
== '-') { /* range */
3889 end_chunk
= simple_strtoul(buf
, &end
, 0);
3890 if (buf
== end
) break;
3892 if (*end
&& !isspace(*end
)) break;
3893 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3894 buf
= skip_spaces(end
);
3896 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3901 static struct md_sysfs_entry md_bitmap
=
3902 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3905 size_show(struct mddev
*mddev
, char *page
)
3907 return sprintf(page
, "%llu\n",
3908 (unsigned long long)mddev
->dev_sectors
/ 2);
3911 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
3914 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3916 /* If array is inactive, we can reduce the component size, but
3917 * not increase it (except from 0).
3918 * If array is active, we can try an on-line resize
3921 int err
= strict_blocks_to_sectors(buf
, §ors
);
3926 err
= update_size(mddev
, sectors
);
3927 md_update_sb(mddev
, 1);
3929 if (mddev
->dev_sectors
== 0 ||
3930 mddev
->dev_sectors
> sectors
)
3931 mddev
->dev_sectors
= sectors
;
3935 return err
? err
: len
;
3938 static struct md_sysfs_entry md_size
=
3939 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3941 /* Metadata version.
3943 * 'none' for arrays with no metadata (good luck...)
3944 * 'external' for arrays with externally managed metadata,
3945 * or N.M for internally known formats
3948 metadata_show(struct mddev
*mddev
, char *page
)
3950 if (mddev
->persistent
)
3951 return sprintf(page
, "%d.%d\n",
3952 mddev
->major_version
, mddev
->minor_version
);
3953 else if (mddev
->external
)
3954 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3956 return sprintf(page
, "none\n");
3960 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3964 /* Changing the details of 'external' metadata is
3965 * always permitted. Otherwise there must be
3966 * no devices attached to the array.
3968 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3970 else if (!list_empty(&mddev
->disks
))
3973 if (cmd_match(buf
, "none")) {
3974 mddev
->persistent
= 0;
3975 mddev
->external
= 0;
3976 mddev
->major_version
= 0;
3977 mddev
->minor_version
= 90;
3980 if (strncmp(buf
, "external:", 9) == 0) {
3981 size_t namelen
= len
-9;
3982 if (namelen
>= sizeof(mddev
->metadata_type
))
3983 namelen
= sizeof(mddev
->metadata_type
)-1;
3984 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3985 mddev
->metadata_type
[namelen
] = 0;
3986 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3987 mddev
->metadata_type
[--namelen
] = 0;
3988 mddev
->persistent
= 0;
3989 mddev
->external
= 1;
3990 mddev
->major_version
= 0;
3991 mddev
->minor_version
= 90;
3994 major
= simple_strtoul(buf
, &e
, 10);
3995 if (e
==buf
|| *e
!= '.')
3998 minor
= simple_strtoul(buf
, &e
, 10);
3999 if (e
==buf
|| (*e
&& *e
!= '\n') )
4001 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4003 mddev
->major_version
= major
;
4004 mddev
->minor_version
= minor
;
4005 mddev
->persistent
= 1;
4006 mddev
->external
= 0;
4010 static struct md_sysfs_entry md_metadata
=
4011 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4014 action_show(struct mddev
*mddev
, char *page
)
4016 char *type
= "idle";
4017 unsigned long recovery
= mddev
->recovery
;
4018 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4020 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4021 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4022 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4024 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4025 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4027 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4031 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4034 return sprintf(page
, "%s\n", type
);
4038 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4040 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4043 if (cmd_match(page
, "frozen"))
4044 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4046 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4048 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4049 flush_workqueue(md_misc_wq
);
4050 if (mddev
->sync_thread
) {
4051 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4052 md_reap_sync_thread(mddev
);
4054 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4055 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4057 else if (cmd_match(page
, "resync"))
4058 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4059 else if (cmd_match(page
, "recover")) {
4060 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4061 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4062 } else if (cmd_match(page
, "reshape")) {
4064 if (mddev
->pers
->start_reshape
== NULL
)
4066 err
= mddev
->pers
->start_reshape(mddev
);
4069 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4071 if (cmd_match(page
, "check"))
4072 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4073 else if (!cmd_match(page
, "repair"))
4075 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4076 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4078 if (mddev
->ro
== 2) {
4079 /* A write to sync_action is enough to justify
4080 * canceling read-auto mode
4083 md_wakeup_thread(mddev
->sync_thread
);
4085 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4086 md_wakeup_thread(mddev
->thread
);
4087 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4091 static struct md_sysfs_entry md_scan_mode
=
4092 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4095 last_sync_action_show(struct mddev
*mddev
, char *page
)
4097 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4100 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4103 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4105 return sprintf(page
, "%llu\n",
4106 (unsigned long long)
4107 atomic64_read(&mddev
->resync_mismatches
));
4110 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4113 sync_min_show(struct mddev
*mddev
, char *page
)
4115 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4116 mddev
->sync_speed_min
? "local": "system");
4120 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4124 if (strncmp(buf
, "system", 6)==0) {
4125 mddev
->sync_speed_min
= 0;
4128 min
= simple_strtoul(buf
, &e
, 10);
4129 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4131 mddev
->sync_speed_min
= min
;
4135 static struct md_sysfs_entry md_sync_min
=
4136 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4139 sync_max_show(struct mddev
*mddev
, char *page
)
4141 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4142 mddev
->sync_speed_max
? "local": "system");
4146 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4150 if (strncmp(buf
, "system", 6)==0) {
4151 mddev
->sync_speed_max
= 0;
4154 max
= simple_strtoul(buf
, &e
, 10);
4155 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4157 mddev
->sync_speed_max
= max
;
4161 static struct md_sysfs_entry md_sync_max
=
4162 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4165 degraded_show(struct mddev
*mddev
, char *page
)
4167 return sprintf(page
, "%d\n", mddev
->degraded
);
4169 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4172 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4174 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4178 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4182 if (kstrtol(buf
, 10, &n
))
4185 if (n
!= 0 && n
!= 1)
4188 mddev
->parallel_resync
= n
;
4190 if (mddev
->sync_thread
)
4191 wake_up(&resync_wait
);
4196 /* force parallel resync, even with shared block devices */
4197 static struct md_sysfs_entry md_sync_force_parallel
=
4198 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4199 sync_force_parallel_show
, sync_force_parallel_store
);
4202 sync_speed_show(struct mddev
*mddev
, char *page
)
4204 unsigned long resync
, dt
, db
;
4205 if (mddev
->curr_resync
== 0)
4206 return sprintf(page
, "none\n");
4207 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4208 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4210 db
= resync
- mddev
->resync_mark_cnt
;
4211 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4214 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4217 sync_completed_show(struct mddev
*mddev
, char *page
)
4219 unsigned long long max_sectors
, resync
;
4221 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4222 return sprintf(page
, "none\n");
4224 if (mddev
->curr_resync
== 1 ||
4225 mddev
->curr_resync
== 2)
4226 return sprintf(page
, "delayed\n");
4228 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4229 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4230 max_sectors
= mddev
->resync_max_sectors
;
4232 max_sectors
= mddev
->dev_sectors
;
4234 resync
= mddev
->curr_resync_completed
;
4235 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4238 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4241 min_sync_show(struct mddev
*mddev
, char *page
)
4243 return sprintf(page
, "%llu\n",
4244 (unsigned long long)mddev
->resync_min
);
4247 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4249 unsigned long long min
;
4253 if (kstrtoull(buf
, 10, &min
))
4256 spin_lock(&mddev
->lock
);
4258 if (min
> mddev
->resync_max
)
4262 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4265 /* Must be a multiple of chunk_size */
4266 chunk
= mddev
->chunk_sectors
;
4268 sector_t temp
= min
;
4271 if (sector_div(temp
, chunk
))
4274 mddev
->resync_min
= min
;
4278 spin_unlock(&mddev
->lock
);
4282 static struct md_sysfs_entry md_min_sync
=
4283 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4286 max_sync_show(struct mddev
*mddev
, char *page
)
4288 if (mddev
->resync_max
== MaxSector
)
4289 return sprintf(page
, "max\n");
4291 return sprintf(page
, "%llu\n",
4292 (unsigned long long)mddev
->resync_max
);
4295 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4298 spin_lock(&mddev
->lock
);
4299 if (strncmp(buf
, "max", 3) == 0)
4300 mddev
->resync_max
= MaxSector
;
4302 unsigned long long max
;
4306 if (kstrtoull(buf
, 10, &max
))
4308 if (max
< mddev
->resync_min
)
4312 if (max
< mddev
->resync_max
&&
4314 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4317 /* Must be a multiple of chunk_size */
4318 chunk
= mddev
->chunk_sectors
;
4320 sector_t temp
= max
;
4323 if (sector_div(temp
, chunk
))
4326 mddev
->resync_max
= max
;
4328 wake_up(&mddev
->recovery_wait
);
4331 spin_unlock(&mddev
->lock
);
4335 static struct md_sysfs_entry md_max_sync
=
4336 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4339 suspend_lo_show(struct mddev
*mddev
, char *page
)
4341 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4345 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4348 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4349 unsigned long long old
= mddev
->suspend_lo
;
4351 if (mddev
->pers
== NULL
||
4352 mddev
->pers
->quiesce
== NULL
)
4354 if (buf
== e
|| (*e
&& *e
!= '\n'))
4357 mddev
->suspend_lo
= new;
4359 /* Shrinking suspended region */
4360 mddev
->pers
->quiesce(mddev
, 2);
4362 /* Expanding suspended region - need to wait */
4363 mddev
->pers
->quiesce(mddev
, 1);
4364 mddev
->pers
->quiesce(mddev
, 0);
4368 static struct md_sysfs_entry md_suspend_lo
=
4369 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4372 suspend_hi_show(struct mddev
*mddev
, char *page
)
4374 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4378 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4381 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4382 unsigned long long old
= mddev
->suspend_hi
;
4384 if (mddev
->pers
== NULL
||
4385 mddev
->pers
->quiesce
== NULL
)
4387 if (buf
== e
|| (*e
&& *e
!= '\n'))
4390 mddev
->suspend_hi
= new;
4392 /* Shrinking suspended region */
4393 mddev
->pers
->quiesce(mddev
, 2);
4395 /* Expanding suspended region - need to wait */
4396 mddev
->pers
->quiesce(mddev
, 1);
4397 mddev
->pers
->quiesce(mddev
, 0);
4401 static struct md_sysfs_entry md_suspend_hi
=
4402 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4405 reshape_position_show(struct mddev
*mddev
, char *page
)
4407 if (mddev
->reshape_position
!= MaxSector
)
4408 return sprintf(page
, "%llu\n",
4409 (unsigned long long)mddev
->reshape_position
);
4410 strcpy(page
, "none\n");
4415 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4417 struct md_rdev
*rdev
;
4419 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4422 if (buf
== e
|| (*e
&& *e
!= '\n'))
4424 mddev
->reshape_position
= new;
4425 mddev
->delta_disks
= 0;
4426 mddev
->reshape_backwards
= 0;
4427 mddev
->new_level
= mddev
->level
;
4428 mddev
->new_layout
= mddev
->layout
;
4429 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4430 rdev_for_each(rdev
, mddev
)
4431 rdev
->new_data_offset
= rdev
->data_offset
;
4435 static struct md_sysfs_entry md_reshape_position
=
4436 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4437 reshape_position_store
);
4440 reshape_direction_show(struct mddev
*mddev
, char *page
)
4442 return sprintf(page
, "%s\n",
4443 mddev
->reshape_backwards
? "backwards" : "forwards");
4447 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4450 if (cmd_match(buf
, "forwards"))
4452 else if (cmd_match(buf
, "backwards"))
4456 if (mddev
->reshape_backwards
== backwards
)
4459 /* check if we are allowed to change */
4460 if (mddev
->delta_disks
)
4463 if (mddev
->persistent
&&
4464 mddev
->major_version
== 0)
4467 mddev
->reshape_backwards
= backwards
;
4471 static struct md_sysfs_entry md_reshape_direction
=
4472 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4473 reshape_direction_store
);
4476 array_size_show(struct mddev
*mddev
, char *page
)
4478 if (mddev
->external_size
)
4479 return sprintf(page
, "%llu\n",
4480 (unsigned long long)mddev
->array_sectors
/2);
4482 return sprintf(page
, "default\n");
4486 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4490 if (strncmp(buf
, "default", 7) == 0) {
4492 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4494 sectors
= mddev
->array_sectors
;
4496 mddev
->external_size
= 0;
4498 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4500 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4503 mddev
->external_size
= 1;
4506 mddev
->array_sectors
= sectors
;
4508 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4509 revalidate_disk(mddev
->gendisk
);
4514 static struct md_sysfs_entry md_array_size
=
4515 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4518 static struct attribute
*md_default_attrs
[] = {
4521 &md_raid_disks
.attr
,
4522 &md_chunk_size
.attr
,
4524 &md_resync_start
.attr
,
4526 &md_new_device
.attr
,
4527 &md_safe_delay
.attr
,
4528 &md_array_state
.attr
,
4529 &md_reshape_position
.attr
,
4530 &md_reshape_direction
.attr
,
4531 &md_array_size
.attr
,
4532 &max_corr_read_errors
.attr
,
4536 static struct attribute
*md_redundancy_attrs
[] = {
4538 &md_last_scan_mode
.attr
,
4539 &md_mismatches
.attr
,
4542 &md_sync_speed
.attr
,
4543 &md_sync_force_parallel
.attr
,
4544 &md_sync_completed
.attr
,
4547 &md_suspend_lo
.attr
,
4548 &md_suspend_hi
.attr
,
4553 static struct attribute_group md_redundancy_group
= {
4555 .attrs
= md_redundancy_attrs
,
4559 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4561 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4562 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4567 spin_lock(&all_mddevs_lock
);
4568 if (list_empty(&mddev
->all_mddevs
)) {
4569 spin_unlock(&all_mddevs_lock
);
4573 spin_unlock(&all_mddevs_lock
);
4575 rv
= entry
->show(mddev
, page
);
4581 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4582 const char *page
, size_t length
)
4584 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4585 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4590 if (!capable(CAP_SYS_ADMIN
))
4592 spin_lock(&all_mddevs_lock
);
4593 if (list_empty(&mddev
->all_mddevs
)) {
4594 spin_unlock(&all_mddevs_lock
);
4598 spin_unlock(&all_mddevs_lock
);
4599 if (entry
->store
== new_dev_store
)
4600 flush_workqueue(md_misc_wq
);
4601 rv
= mddev_lock(mddev
);
4603 rv
= entry
->store(mddev
, page
, length
);
4604 mddev_unlock(mddev
);
4610 static void md_free(struct kobject
*ko
)
4612 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4614 if (mddev
->sysfs_state
)
4615 sysfs_put(mddev
->sysfs_state
);
4617 if (mddev
->gendisk
) {
4618 del_gendisk(mddev
->gendisk
);
4619 put_disk(mddev
->gendisk
);
4622 blk_cleanup_queue(mddev
->queue
);
4627 static const struct sysfs_ops md_sysfs_ops
= {
4628 .show
= md_attr_show
,
4629 .store
= md_attr_store
,
4631 static struct kobj_type md_ktype
= {
4633 .sysfs_ops
= &md_sysfs_ops
,
4634 .default_attrs
= md_default_attrs
,
4639 static void mddev_delayed_delete(struct work_struct
*ws
)
4641 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4643 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4644 kobject_del(&mddev
->kobj
);
4645 kobject_put(&mddev
->kobj
);
4648 static int md_alloc(dev_t dev
, char *name
)
4650 static DEFINE_MUTEX(disks_mutex
);
4651 struct mddev
*mddev
= mddev_find(dev
);
4652 struct gendisk
*disk
;
4661 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4662 shift
= partitioned
? MdpMinorShift
: 0;
4663 unit
= MINOR(mddev
->unit
) >> shift
;
4665 /* wait for any previous instance of this device to be
4666 * completely removed (mddev_delayed_delete).
4668 flush_workqueue(md_misc_wq
);
4670 mutex_lock(&disks_mutex
);
4676 /* Need to ensure that 'name' is not a duplicate.
4678 struct mddev
*mddev2
;
4679 spin_lock(&all_mddevs_lock
);
4681 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4682 if (mddev2
->gendisk
&&
4683 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4684 spin_unlock(&all_mddevs_lock
);
4687 spin_unlock(&all_mddevs_lock
);
4691 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4694 mddev
->queue
->queuedata
= mddev
;
4696 blk_queue_make_request(mddev
->queue
, md_make_request
);
4697 blk_set_stacking_limits(&mddev
->queue
->limits
);
4699 disk
= alloc_disk(1 << shift
);
4701 blk_cleanup_queue(mddev
->queue
);
4702 mddev
->queue
= NULL
;
4705 disk
->major
= MAJOR(mddev
->unit
);
4706 disk
->first_minor
= unit
<< shift
;
4708 strcpy(disk
->disk_name
, name
);
4709 else if (partitioned
)
4710 sprintf(disk
->disk_name
, "md_d%d", unit
);
4712 sprintf(disk
->disk_name
, "md%d", unit
);
4713 disk
->fops
= &md_fops
;
4714 disk
->private_data
= mddev
;
4715 disk
->queue
= mddev
->queue
;
4716 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4717 /* Allow extended partitions. This makes the
4718 * 'mdp' device redundant, but we can't really
4721 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4722 mddev
->gendisk
= disk
;
4723 /* As soon as we call add_disk(), another thread could get
4724 * through to md_open, so make sure it doesn't get too far
4726 mutex_lock(&mddev
->open_mutex
);
4729 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4730 &disk_to_dev(disk
)->kobj
, "%s", "md");
4732 /* This isn't possible, but as kobject_init_and_add is marked
4733 * __must_check, we must do something with the result
4735 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4739 if (mddev
->kobj
.sd
&&
4740 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4741 printk(KERN_DEBUG
"pointless warning\n");
4742 mutex_unlock(&mddev
->open_mutex
);
4744 mutex_unlock(&disks_mutex
);
4745 if (!error
&& mddev
->kobj
.sd
) {
4746 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4747 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4753 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4755 md_alloc(dev
, NULL
);
4759 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4761 /* val must be "md_*" where * is not all digits.
4762 * We allocate an array with a large free minor number, and
4763 * set the name to val. val must not already be an active name.
4765 int len
= strlen(val
);
4766 char buf
[DISK_NAME_LEN
];
4768 while (len
&& val
[len
-1] == '\n')
4770 if (len
>= DISK_NAME_LEN
)
4772 strlcpy(buf
, val
, len
+1);
4773 if (strncmp(buf
, "md_", 3) != 0)
4775 return md_alloc(0, buf
);
4778 static void md_safemode_timeout(unsigned long data
)
4780 struct mddev
*mddev
= (struct mddev
*) data
;
4782 if (!atomic_read(&mddev
->writes_pending
)) {
4783 mddev
->safemode
= 1;
4784 if (mddev
->external
)
4785 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4787 md_wakeup_thread(mddev
->thread
);
4790 static int start_dirty_degraded
;
4792 int md_run(struct mddev
*mddev
)
4795 struct md_rdev
*rdev
;
4796 struct md_personality
*pers
;
4798 if (list_empty(&mddev
->disks
))
4799 /* cannot run an array with no devices.. */
4804 /* Cannot run until previous stop completes properly */
4805 if (mddev
->sysfs_active
)
4809 * Analyze all RAID superblock(s)
4811 if (!mddev
->raid_disks
) {
4812 if (!mddev
->persistent
)
4817 if (mddev
->level
!= LEVEL_NONE
)
4818 request_module("md-level-%d", mddev
->level
);
4819 else if (mddev
->clevel
[0])
4820 request_module("md-%s", mddev
->clevel
);
4823 * Drop all container device buffers, from now on
4824 * the only valid external interface is through the md
4827 rdev_for_each(rdev
, mddev
) {
4828 if (test_bit(Faulty
, &rdev
->flags
))
4830 sync_blockdev(rdev
->bdev
);
4831 invalidate_bdev(rdev
->bdev
);
4833 /* perform some consistency tests on the device.
4834 * We don't want the data to overlap the metadata,
4835 * Internal Bitmap issues have been handled elsewhere.
4837 if (rdev
->meta_bdev
) {
4838 /* Nothing to check */;
4839 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4840 if (mddev
->dev_sectors
&&
4841 rdev
->data_offset
+ mddev
->dev_sectors
4843 printk("md: %s: data overlaps metadata\n",
4848 if (rdev
->sb_start
+ rdev
->sb_size
/512
4849 > rdev
->data_offset
) {
4850 printk("md: %s: metadata overlaps data\n",
4855 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4858 if (mddev
->bio_set
== NULL
)
4859 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
4861 spin_lock(&pers_lock
);
4862 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4863 if (!pers
|| !try_module_get(pers
->owner
)) {
4864 spin_unlock(&pers_lock
);
4865 if (mddev
->level
!= LEVEL_NONE
)
4866 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4869 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4873 spin_unlock(&pers_lock
);
4874 if (mddev
->level
!= pers
->level
) {
4875 mddev
->level
= pers
->level
;
4876 mddev
->new_level
= pers
->level
;
4878 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4880 if (mddev
->reshape_position
!= MaxSector
&&
4881 pers
->start_reshape
== NULL
) {
4882 /* This personality cannot handle reshaping... */
4883 module_put(pers
->owner
);
4887 if (pers
->sync_request
) {
4888 /* Warn if this is a potentially silly
4891 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4892 struct md_rdev
*rdev2
;
4895 rdev_for_each(rdev
, mddev
)
4896 rdev_for_each(rdev2
, mddev
) {
4898 rdev
->bdev
->bd_contains
==
4899 rdev2
->bdev
->bd_contains
) {
4901 "%s: WARNING: %s appears to be"
4902 " on the same physical disk as"
4905 bdevname(rdev
->bdev
,b
),
4906 bdevname(rdev2
->bdev
,b2
));
4913 "True protection against single-disk"
4914 " failure might be compromised.\n");
4917 mddev
->recovery
= 0;
4918 /* may be over-ridden by personality */
4919 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4921 mddev
->ok_start_degraded
= start_dirty_degraded
;
4923 if (start_readonly
&& mddev
->ro
== 0)
4924 mddev
->ro
= 2; /* read-only, but switch on first write */
4926 err
= pers
->run(mddev
);
4928 printk(KERN_ERR
"md: pers->run() failed ...\n");
4929 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4930 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4931 " but 'external_size' not in effect?\n", __func__
);
4933 "md: invalid array_size %llu > default size %llu\n",
4934 (unsigned long long)mddev
->array_sectors
/ 2,
4935 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
4938 if (err
== 0 && pers
->sync_request
&&
4939 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
4940 err
= bitmap_create(mddev
);
4942 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4943 mdname(mddev
), err
);
4946 mddev_detach(mddev
);
4947 pers
->free(mddev
, mddev
->private);
4948 module_put(pers
->owner
);
4949 bitmap_destroy(mddev
);
4953 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
4954 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
4955 blk_queue_merge_bvec(mddev
->queue
, md_mergeable_bvec
);
4957 if (pers
->sync_request
) {
4958 if (mddev
->kobj
.sd
&&
4959 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4961 "md: cannot register extra attributes for %s\n",
4963 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4964 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4967 atomic_set(&mddev
->writes_pending
,0);
4968 atomic_set(&mddev
->max_corr_read_errors
,
4969 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4970 mddev
->safemode
= 0;
4971 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4972 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4973 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4976 spin_lock(&mddev
->lock
);
4979 spin_unlock(&mddev
->lock
);
4980 rdev_for_each(rdev
, mddev
)
4981 if (rdev
->raid_disk
>= 0)
4982 if (sysfs_link_rdev(mddev
, rdev
))
4983 /* failure here is OK */;
4985 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4987 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
4988 md_update_sb(mddev
, 0);
4990 md_new_event(mddev
);
4991 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4992 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4993 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4996 EXPORT_SYMBOL_GPL(md_run
);
4998 static int do_md_run(struct mddev
*mddev
)
5002 err
= md_run(mddev
);
5005 err
= bitmap_load(mddev
);
5007 bitmap_destroy(mddev
);
5011 md_wakeup_thread(mddev
->thread
);
5012 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5014 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5015 revalidate_disk(mddev
->gendisk
);
5017 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5022 static int restart_array(struct mddev
*mddev
)
5024 struct gendisk
*disk
= mddev
->gendisk
;
5026 /* Complain if it has no devices */
5027 if (list_empty(&mddev
->disks
))
5033 mddev
->safemode
= 0;
5035 set_disk_ro(disk
, 0);
5036 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5038 /* Kick recovery or resync if necessary */
5039 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5040 md_wakeup_thread(mddev
->thread
);
5041 md_wakeup_thread(mddev
->sync_thread
);
5042 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5046 static void md_clean(struct mddev
*mddev
)
5048 mddev
->array_sectors
= 0;
5049 mddev
->external_size
= 0;
5050 mddev
->dev_sectors
= 0;
5051 mddev
->raid_disks
= 0;
5052 mddev
->recovery_cp
= 0;
5053 mddev
->resync_min
= 0;
5054 mddev
->resync_max
= MaxSector
;
5055 mddev
->reshape_position
= MaxSector
;
5056 mddev
->external
= 0;
5057 mddev
->persistent
= 0;
5058 mddev
->level
= LEVEL_NONE
;
5059 mddev
->clevel
[0] = 0;
5062 mddev
->metadata_type
[0] = 0;
5063 mddev
->chunk_sectors
= 0;
5064 mddev
->ctime
= mddev
->utime
= 0;
5066 mddev
->max_disks
= 0;
5068 mddev
->can_decrease_events
= 0;
5069 mddev
->delta_disks
= 0;
5070 mddev
->reshape_backwards
= 0;
5071 mddev
->new_level
= LEVEL_NONE
;
5072 mddev
->new_layout
= 0;
5073 mddev
->new_chunk_sectors
= 0;
5074 mddev
->curr_resync
= 0;
5075 atomic64_set(&mddev
->resync_mismatches
, 0);
5076 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5077 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5078 mddev
->recovery
= 0;
5081 mddev
->degraded
= 0;
5082 mddev
->safemode
= 0;
5083 mddev
->merge_check_needed
= 0;
5084 mddev
->bitmap_info
.offset
= 0;
5085 mddev
->bitmap_info
.default_offset
= 0;
5086 mddev
->bitmap_info
.default_space
= 0;
5087 mddev
->bitmap_info
.chunksize
= 0;
5088 mddev
->bitmap_info
.daemon_sleep
= 0;
5089 mddev
->bitmap_info
.max_write_behind
= 0;
5092 static void __md_stop_writes(struct mddev
*mddev
)
5094 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5095 flush_workqueue(md_misc_wq
);
5096 if (mddev
->sync_thread
) {
5097 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5098 md_reap_sync_thread(mddev
);
5101 del_timer_sync(&mddev
->safemode_timer
);
5103 bitmap_flush(mddev
);
5104 md_super_wait(mddev
);
5106 if (mddev
->ro
== 0 &&
5107 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5108 /* mark array as shutdown cleanly */
5110 md_update_sb(mddev
, 1);
5114 void md_stop_writes(struct mddev
*mddev
)
5116 mddev_lock_nointr(mddev
);
5117 __md_stop_writes(mddev
);
5118 mddev_unlock(mddev
);
5120 EXPORT_SYMBOL_GPL(md_stop_writes
);
5122 static void mddev_detach(struct mddev
*mddev
)
5124 struct bitmap
*bitmap
= mddev
->bitmap
;
5125 /* wait for behind writes to complete */
5126 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5127 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5129 /* need to kick something here to make sure I/O goes? */
5130 wait_event(bitmap
->behind_wait
,
5131 atomic_read(&bitmap
->behind_writes
) == 0);
5133 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5134 mddev
->pers
->quiesce(mddev
, 1);
5135 mddev
->pers
->quiesce(mddev
, 0);
5137 md_unregister_thread(&mddev
->thread
);
5139 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5142 static void __md_stop(struct mddev
*mddev
)
5144 struct md_personality
*pers
= mddev
->pers
;
5145 mddev_detach(mddev
);
5146 spin_lock(&mddev
->lock
);
5149 spin_unlock(&mddev
->lock
);
5150 pers
->free(mddev
, mddev
->private);
5151 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5152 mddev
->to_remove
= &md_redundancy_group
;
5153 module_put(pers
->owner
);
5154 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5157 void md_stop(struct mddev
*mddev
)
5159 /* stop the array and free an attached data structures.
5160 * This is called from dm-raid
5163 bitmap_destroy(mddev
);
5165 bioset_free(mddev
->bio_set
);
5168 EXPORT_SYMBOL_GPL(md_stop
);
5170 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5175 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5177 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5178 md_wakeup_thread(mddev
->thread
);
5180 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5181 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5182 if (mddev
->sync_thread
)
5183 /* Thread might be blocked waiting for metadata update
5184 * which will now never happen */
5185 wake_up_process(mddev
->sync_thread
->tsk
);
5187 mddev_unlock(mddev
);
5188 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5190 mddev_lock_nointr(mddev
);
5192 mutex_lock(&mddev
->open_mutex
);
5193 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5194 mddev
->sync_thread
||
5195 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5196 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5197 printk("md: %s still in use.\n",mdname(mddev
));
5199 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5200 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5201 md_wakeup_thread(mddev
->thread
);
5207 __md_stop_writes(mddev
);
5213 set_disk_ro(mddev
->gendisk
, 1);
5214 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5215 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5216 md_wakeup_thread(mddev
->thread
);
5217 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5221 mutex_unlock(&mddev
->open_mutex
);
5226 * 0 - completely stop and dis-assemble array
5227 * 2 - stop but do not disassemble array
5229 static int do_md_stop(struct mddev
*mddev
, int mode
,
5230 struct block_device
*bdev
)
5232 struct gendisk
*disk
= mddev
->gendisk
;
5233 struct md_rdev
*rdev
;
5236 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5238 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5239 md_wakeup_thread(mddev
->thread
);
5241 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5242 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5243 if (mddev
->sync_thread
)
5244 /* Thread might be blocked waiting for metadata update
5245 * which will now never happen */
5246 wake_up_process(mddev
->sync_thread
->tsk
);
5248 mddev_unlock(mddev
);
5249 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5250 !test_bit(MD_RECOVERY_RUNNING
,
5251 &mddev
->recovery
)));
5252 mddev_lock_nointr(mddev
);
5254 mutex_lock(&mddev
->open_mutex
);
5255 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5256 mddev
->sysfs_active
||
5257 mddev
->sync_thread
||
5258 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5259 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5260 printk("md: %s still in use.\n",mdname(mddev
));
5261 mutex_unlock(&mddev
->open_mutex
);
5263 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5264 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5265 md_wakeup_thread(mddev
->thread
);
5271 set_disk_ro(disk
, 0);
5273 __md_stop_writes(mddev
);
5275 mddev
->queue
->merge_bvec_fn
= NULL
;
5276 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5278 /* tell userspace to handle 'inactive' */
5279 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5281 rdev_for_each(rdev
, mddev
)
5282 if (rdev
->raid_disk
>= 0)
5283 sysfs_unlink_rdev(mddev
, rdev
);
5285 set_capacity(disk
, 0);
5286 mutex_unlock(&mddev
->open_mutex
);
5288 revalidate_disk(disk
);
5293 mutex_unlock(&mddev
->open_mutex
);
5295 * Free resources if final stop
5298 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5300 bitmap_destroy(mddev
);
5301 if (mddev
->bitmap_info
.file
) {
5302 struct file
*f
= mddev
->bitmap_info
.file
;
5303 spin_lock(&mddev
->lock
);
5304 mddev
->bitmap_info
.file
= NULL
;
5305 spin_unlock(&mddev
->lock
);
5308 mddev
->bitmap_info
.offset
= 0;
5310 export_array(mddev
);
5313 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5314 if (mddev
->hold_active
== UNTIL_STOP
)
5315 mddev
->hold_active
= 0;
5317 blk_integrity_unregister(disk
);
5318 md_new_event(mddev
);
5319 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5324 static void autorun_array(struct mddev
*mddev
)
5326 struct md_rdev
*rdev
;
5329 if (list_empty(&mddev
->disks
))
5332 printk(KERN_INFO
"md: running: ");
5334 rdev_for_each(rdev
, mddev
) {
5335 char b
[BDEVNAME_SIZE
];
5336 printk("<%s>", bdevname(rdev
->bdev
,b
));
5340 err
= do_md_run(mddev
);
5342 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5343 do_md_stop(mddev
, 0, NULL
);
5348 * lets try to run arrays based on all disks that have arrived
5349 * until now. (those are in pending_raid_disks)
5351 * the method: pick the first pending disk, collect all disks with
5352 * the same UUID, remove all from the pending list and put them into
5353 * the 'same_array' list. Then order this list based on superblock
5354 * update time (freshest comes first), kick out 'old' disks and
5355 * compare superblocks. If everything's fine then run it.
5357 * If "unit" is allocated, then bump its reference count
5359 static void autorun_devices(int part
)
5361 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5362 struct mddev
*mddev
;
5363 char b
[BDEVNAME_SIZE
];
5365 printk(KERN_INFO
"md: autorun ...\n");
5366 while (!list_empty(&pending_raid_disks
)) {
5369 LIST_HEAD(candidates
);
5370 rdev0
= list_entry(pending_raid_disks
.next
,
5371 struct md_rdev
, same_set
);
5373 printk(KERN_INFO
"md: considering %s ...\n",
5374 bdevname(rdev0
->bdev
,b
));
5375 INIT_LIST_HEAD(&candidates
);
5376 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5377 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5378 printk(KERN_INFO
"md: adding %s ...\n",
5379 bdevname(rdev
->bdev
,b
));
5380 list_move(&rdev
->same_set
, &candidates
);
5383 * now we have a set of devices, with all of them having
5384 * mostly sane superblocks. It's time to allocate the
5388 dev
= MKDEV(mdp_major
,
5389 rdev0
->preferred_minor
<< MdpMinorShift
);
5390 unit
= MINOR(dev
) >> MdpMinorShift
;
5392 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5395 if (rdev0
->preferred_minor
!= unit
) {
5396 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5397 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5401 md_probe(dev
, NULL
, NULL
);
5402 mddev
= mddev_find(dev
);
5403 if (!mddev
|| !mddev
->gendisk
) {
5407 "md: cannot allocate memory for md drive.\n");
5410 if (mddev_lock(mddev
))
5411 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5413 else if (mddev
->raid_disks
|| mddev
->major_version
5414 || !list_empty(&mddev
->disks
)) {
5416 "md: %s already running, cannot run %s\n",
5417 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5418 mddev_unlock(mddev
);
5420 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5421 mddev
->persistent
= 1;
5422 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5423 list_del_init(&rdev
->same_set
);
5424 if (bind_rdev_to_array(rdev
, mddev
))
5427 autorun_array(mddev
);
5428 mddev_unlock(mddev
);
5430 /* on success, candidates will be empty, on error
5433 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5434 list_del_init(&rdev
->same_set
);
5439 printk(KERN_INFO
"md: ... autorun DONE.\n");
5441 #endif /* !MODULE */
5443 static int get_version(void __user
*arg
)
5447 ver
.major
= MD_MAJOR_VERSION
;
5448 ver
.minor
= MD_MINOR_VERSION
;
5449 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5451 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5457 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5459 mdu_array_info_t info
;
5460 int nr
,working
,insync
,failed
,spare
;
5461 struct md_rdev
*rdev
;
5463 nr
= working
= insync
= failed
= spare
= 0;
5465 rdev_for_each_rcu(rdev
, mddev
) {
5467 if (test_bit(Faulty
, &rdev
->flags
))
5471 if (test_bit(In_sync
, &rdev
->flags
))
5479 info
.major_version
= mddev
->major_version
;
5480 info
.minor_version
= mddev
->minor_version
;
5481 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5482 info
.ctime
= mddev
->ctime
;
5483 info
.level
= mddev
->level
;
5484 info
.size
= mddev
->dev_sectors
/ 2;
5485 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5488 info
.raid_disks
= mddev
->raid_disks
;
5489 info
.md_minor
= mddev
->md_minor
;
5490 info
.not_persistent
= !mddev
->persistent
;
5492 info
.utime
= mddev
->utime
;
5495 info
.state
= (1<<MD_SB_CLEAN
);
5496 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5497 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5498 info
.active_disks
= insync
;
5499 info
.working_disks
= working
;
5500 info
.failed_disks
= failed
;
5501 info
.spare_disks
= spare
;
5503 info
.layout
= mddev
->layout
;
5504 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5506 if (copy_to_user(arg
, &info
, sizeof(info
)))
5512 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5514 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5518 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5523 spin_lock(&mddev
->lock
);
5524 /* bitmap disabled, zero the first byte and copy out */
5525 if (!mddev
->bitmap_info
.file
)
5526 file
->pathname
[0] = '\0';
5527 else if ((ptr
= d_path(&mddev
->bitmap_info
.file
->f_path
,
5528 file
->pathname
, sizeof(file
->pathname
))),
5532 memmove(file
->pathname
, ptr
,
5533 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5534 spin_unlock(&mddev
->lock
);
5537 copy_to_user(arg
, file
, sizeof(*file
)))
5544 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5546 mdu_disk_info_t info
;
5547 struct md_rdev
*rdev
;
5549 if (copy_from_user(&info
, arg
, sizeof(info
)))
5553 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5555 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5556 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5557 info
.raid_disk
= rdev
->raid_disk
;
5559 if (test_bit(Faulty
, &rdev
->flags
))
5560 info
.state
|= (1<<MD_DISK_FAULTY
);
5561 else if (test_bit(In_sync
, &rdev
->flags
)) {
5562 info
.state
|= (1<<MD_DISK_ACTIVE
);
5563 info
.state
|= (1<<MD_DISK_SYNC
);
5565 if (test_bit(WriteMostly
, &rdev
->flags
))
5566 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5568 info
.major
= info
.minor
= 0;
5569 info
.raid_disk
= -1;
5570 info
.state
= (1<<MD_DISK_REMOVED
);
5574 if (copy_to_user(arg
, &info
, sizeof(info
)))
5580 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5582 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5583 struct md_rdev
*rdev
;
5584 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5586 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5589 if (!mddev
->raid_disks
) {
5591 /* expecting a device which has a superblock */
5592 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5595 "md: md_import_device returned %ld\n",
5597 return PTR_ERR(rdev
);
5599 if (!list_empty(&mddev
->disks
)) {
5600 struct md_rdev
*rdev0
5601 = list_entry(mddev
->disks
.next
,
5602 struct md_rdev
, same_set
);
5603 err
= super_types
[mddev
->major_version
]
5604 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5607 "md: %s has different UUID to %s\n",
5608 bdevname(rdev
->bdev
,b
),
5609 bdevname(rdev0
->bdev
,b2
));
5614 err
= bind_rdev_to_array(rdev
, mddev
);
5621 * add_new_disk can be used once the array is assembled
5622 * to add "hot spares". They must already have a superblock
5627 if (!mddev
->pers
->hot_add_disk
) {
5629 "%s: personality does not support diskops!\n",
5633 if (mddev
->persistent
)
5634 rdev
= md_import_device(dev
, mddev
->major_version
,
5635 mddev
->minor_version
);
5637 rdev
= md_import_device(dev
, -1, -1);
5640 "md: md_import_device returned %ld\n",
5642 return PTR_ERR(rdev
);
5644 /* set saved_raid_disk if appropriate */
5645 if (!mddev
->persistent
) {
5646 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5647 info
->raid_disk
< mddev
->raid_disks
) {
5648 rdev
->raid_disk
= info
->raid_disk
;
5649 set_bit(In_sync
, &rdev
->flags
);
5650 clear_bit(Bitmap_sync
, &rdev
->flags
);
5652 rdev
->raid_disk
= -1;
5653 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5655 super_types
[mddev
->major_version
].
5656 validate_super(mddev
, rdev
);
5657 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5658 rdev
->raid_disk
!= info
->raid_disk
) {
5659 /* This was a hot-add request, but events doesn't
5660 * match, so reject it.
5666 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5667 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5668 set_bit(WriteMostly
, &rdev
->flags
);
5670 clear_bit(WriteMostly
, &rdev
->flags
);
5672 rdev
->raid_disk
= -1;
5673 err
= bind_rdev_to_array(rdev
, mddev
);
5674 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5675 /* If there is hot_add_disk but no hot_remove_disk
5676 * then added disks for geometry changes,
5677 * and should be added immediately.
5679 super_types
[mddev
->major_version
].
5680 validate_super(mddev
, rdev
);
5681 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5683 unbind_rdev_from_array(rdev
);
5688 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5690 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5691 if (mddev
->degraded
)
5692 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5693 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5695 md_new_event(mddev
);
5696 md_wakeup_thread(mddev
->thread
);
5700 /* otherwise, add_new_disk is only allowed
5701 * for major_version==0 superblocks
5703 if (mddev
->major_version
!= 0) {
5704 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5709 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5711 rdev
= md_import_device(dev
, -1, 0);
5714 "md: error, md_import_device() returned %ld\n",
5716 return PTR_ERR(rdev
);
5718 rdev
->desc_nr
= info
->number
;
5719 if (info
->raid_disk
< mddev
->raid_disks
)
5720 rdev
->raid_disk
= info
->raid_disk
;
5722 rdev
->raid_disk
= -1;
5724 if (rdev
->raid_disk
< mddev
->raid_disks
)
5725 if (info
->state
& (1<<MD_DISK_SYNC
))
5726 set_bit(In_sync
, &rdev
->flags
);
5728 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5729 set_bit(WriteMostly
, &rdev
->flags
);
5731 if (!mddev
->persistent
) {
5732 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5733 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5735 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5736 rdev
->sectors
= rdev
->sb_start
;
5738 err
= bind_rdev_to_array(rdev
, mddev
);
5748 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5750 char b
[BDEVNAME_SIZE
];
5751 struct md_rdev
*rdev
;
5753 rdev
= find_rdev(mddev
, dev
);
5757 clear_bit(Blocked
, &rdev
->flags
);
5758 remove_and_add_spares(mddev
, rdev
);
5760 if (rdev
->raid_disk
>= 0)
5763 kick_rdev_from_array(rdev
);
5764 md_update_sb(mddev
, 1);
5765 md_new_event(mddev
);
5769 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5770 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5774 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5776 char b
[BDEVNAME_SIZE
];
5778 struct md_rdev
*rdev
;
5783 if (mddev
->major_version
!= 0) {
5784 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5785 " version-0 superblocks.\n",
5789 if (!mddev
->pers
->hot_add_disk
) {
5791 "%s: personality does not support diskops!\n",
5796 rdev
= md_import_device(dev
, -1, 0);
5799 "md: error, md_import_device() returned %ld\n",
5804 if (mddev
->persistent
)
5805 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5807 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5809 rdev
->sectors
= rdev
->sb_start
;
5811 if (test_bit(Faulty
, &rdev
->flags
)) {
5813 "md: can not hot-add faulty %s disk to %s!\n",
5814 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5818 clear_bit(In_sync
, &rdev
->flags
);
5820 rdev
->saved_raid_disk
= -1;
5821 err
= bind_rdev_to_array(rdev
, mddev
);
5826 * The rest should better be atomic, we can have disk failures
5827 * noticed in interrupt contexts ...
5830 rdev
->raid_disk
= -1;
5832 md_update_sb(mddev
, 1);
5835 * Kick recovery, maybe this spare has to be added to the
5836 * array immediately.
5838 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5839 md_wakeup_thread(mddev
->thread
);
5840 md_new_event(mddev
);
5848 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5853 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
5855 if (mddev
->recovery
|| mddev
->sync_thread
)
5857 /* we should be able to change the bitmap.. */
5861 struct inode
*inode
;
5864 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
5865 return -EEXIST
; /* cannot add when bitmap is present */
5869 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5874 inode
= f
->f_mapping
->host
;
5875 if (!S_ISREG(inode
->i_mode
)) {
5876 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
5879 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
5880 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
5883 } else if (atomic_read(&inode
->i_writecount
) != 1) {
5884 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5892 mddev
->bitmap_info
.file
= f
;
5893 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5894 } else if (mddev
->bitmap
== NULL
)
5895 return -ENOENT
; /* cannot remove what isn't there */
5898 mddev
->pers
->quiesce(mddev
, 1);
5900 err
= bitmap_create(mddev
);
5902 err
= bitmap_load(mddev
);
5904 if (fd
< 0 || err
) {
5905 bitmap_destroy(mddev
);
5906 fd
= -1; /* make sure to put the file */
5908 mddev
->pers
->quiesce(mddev
, 0);
5911 struct file
*f
= mddev
->bitmap_info
.file
;
5913 spin_lock(&mddev
->lock
);
5914 mddev
->bitmap_info
.file
= NULL
;
5915 spin_unlock(&mddev
->lock
);
5924 * set_array_info is used two different ways
5925 * The original usage is when creating a new array.
5926 * In this usage, raid_disks is > 0 and it together with
5927 * level, size, not_persistent,layout,chunksize determine the
5928 * shape of the array.
5929 * This will always create an array with a type-0.90.0 superblock.
5930 * The newer usage is when assembling an array.
5931 * In this case raid_disks will be 0, and the major_version field is
5932 * use to determine which style super-blocks are to be found on the devices.
5933 * The minor and patch _version numbers are also kept incase the
5934 * super_block handler wishes to interpret them.
5936 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
5939 if (info
->raid_disks
== 0) {
5940 /* just setting version number for superblock loading */
5941 if (info
->major_version
< 0 ||
5942 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5943 super_types
[info
->major_version
].name
== NULL
) {
5944 /* maybe try to auto-load a module? */
5946 "md: superblock version %d not known\n",
5947 info
->major_version
);
5950 mddev
->major_version
= info
->major_version
;
5951 mddev
->minor_version
= info
->minor_version
;
5952 mddev
->patch_version
= info
->patch_version
;
5953 mddev
->persistent
= !info
->not_persistent
;
5954 /* ensure mddev_put doesn't delete this now that there
5955 * is some minimal configuration.
5957 mddev
->ctime
= get_seconds();
5960 mddev
->major_version
= MD_MAJOR_VERSION
;
5961 mddev
->minor_version
= MD_MINOR_VERSION
;
5962 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5963 mddev
->ctime
= get_seconds();
5965 mddev
->level
= info
->level
;
5966 mddev
->clevel
[0] = 0;
5967 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5968 mddev
->raid_disks
= info
->raid_disks
;
5969 /* don't set md_minor, it is determined by which /dev/md* was
5972 if (info
->state
& (1<<MD_SB_CLEAN
))
5973 mddev
->recovery_cp
= MaxSector
;
5975 mddev
->recovery_cp
= 0;
5976 mddev
->persistent
= ! info
->not_persistent
;
5977 mddev
->external
= 0;
5979 mddev
->layout
= info
->layout
;
5980 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5982 mddev
->max_disks
= MD_SB_DISKS
;
5984 if (mddev
->persistent
)
5986 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5988 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5989 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
5990 mddev
->bitmap_info
.offset
= 0;
5992 mddev
->reshape_position
= MaxSector
;
5995 * Generate a 128 bit UUID
5997 get_random_bytes(mddev
->uuid
, 16);
5999 mddev
->new_level
= mddev
->level
;
6000 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6001 mddev
->new_layout
= mddev
->layout
;
6002 mddev
->delta_disks
= 0;
6003 mddev
->reshape_backwards
= 0;
6008 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6010 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6012 if (mddev
->external_size
)
6015 mddev
->array_sectors
= array_sectors
;
6017 EXPORT_SYMBOL(md_set_array_sectors
);
6019 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6021 struct md_rdev
*rdev
;
6023 int fit
= (num_sectors
== 0);
6025 if (mddev
->pers
->resize
== NULL
)
6027 /* The "num_sectors" is the number of sectors of each device that
6028 * is used. This can only make sense for arrays with redundancy.
6029 * linear and raid0 always use whatever space is available. We can only
6030 * consider changing this number if no resync or reconstruction is
6031 * happening, and if the new size is acceptable. It must fit before the
6032 * sb_start or, if that is <data_offset, it must fit before the size
6033 * of each device. If num_sectors is zero, we find the largest size
6036 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6042 rdev_for_each(rdev
, mddev
) {
6043 sector_t avail
= rdev
->sectors
;
6045 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6046 num_sectors
= avail
;
6047 if (avail
< num_sectors
)
6050 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6052 revalidate_disk(mddev
->gendisk
);
6056 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6059 struct md_rdev
*rdev
;
6060 /* change the number of raid disks */
6061 if (mddev
->pers
->check_reshape
== NULL
)
6065 if (raid_disks
<= 0 ||
6066 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6068 if (mddev
->sync_thread
||
6069 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6070 mddev
->reshape_position
!= MaxSector
)
6073 rdev_for_each(rdev
, mddev
) {
6074 if (mddev
->raid_disks
< raid_disks
&&
6075 rdev
->data_offset
< rdev
->new_data_offset
)
6077 if (mddev
->raid_disks
> raid_disks
&&
6078 rdev
->data_offset
> rdev
->new_data_offset
)
6082 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6083 if (mddev
->delta_disks
< 0)
6084 mddev
->reshape_backwards
= 1;
6085 else if (mddev
->delta_disks
> 0)
6086 mddev
->reshape_backwards
= 0;
6088 rv
= mddev
->pers
->check_reshape(mddev
);
6090 mddev
->delta_disks
= 0;
6091 mddev
->reshape_backwards
= 0;
6097 * update_array_info is used to change the configuration of an
6099 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6100 * fields in the info are checked against the array.
6101 * Any differences that cannot be handled will cause an error.
6102 * Normally, only one change can be managed at a time.
6104 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6110 /* calculate expected state,ignoring low bits */
6111 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6112 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6114 if (mddev
->major_version
!= info
->major_version
||
6115 mddev
->minor_version
!= info
->minor_version
||
6116 /* mddev->patch_version != info->patch_version || */
6117 mddev
->ctime
!= info
->ctime
||
6118 mddev
->level
!= info
->level
||
6119 /* mddev->layout != info->layout || */
6120 !mddev
->persistent
!= info
->not_persistent
||
6121 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6122 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6123 ((state
^info
->state
) & 0xfffffe00)
6126 /* Check there is only one change */
6127 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6129 if (mddev
->raid_disks
!= info
->raid_disks
)
6131 if (mddev
->layout
!= info
->layout
)
6133 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6140 if (mddev
->layout
!= info
->layout
) {
6142 * we don't need to do anything at the md level, the
6143 * personality will take care of it all.
6145 if (mddev
->pers
->check_reshape
== NULL
)
6148 mddev
->new_layout
= info
->layout
;
6149 rv
= mddev
->pers
->check_reshape(mddev
);
6151 mddev
->new_layout
= mddev
->layout
;
6155 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6156 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6158 if (mddev
->raid_disks
!= info
->raid_disks
)
6159 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6161 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6162 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
)
6164 if (mddev
->recovery
|| mddev
->sync_thread
)
6166 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6167 /* add the bitmap */
6170 if (mddev
->bitmap_info
.default_offset
== 0)
6172 mddev
->bitmap_info
.offset
=
6173 mddev
->bitmap_info
.default_offset
;
6174 mddev
->bitmap_info
.space
=
6175 mddev
->bitmap_info
.default_space
;
6176 mddev
->pers
->quiesce(mddev
, 1);
6177 rv
= bitmap_create(mddev
);
6179 rv
= bitmap_load(mddev
);
6181 bitmap_destroy(mddev
);
6182 mddev
->pers
->quiesce(mddev
, 0);
6184 /* remove the bitmap */
6187 if (mddev
->bitmap
->storage
.file
)
6189 mddev
->pers
->quiesce(mddev
, 1);
6190 bitmap_destroy(mddev
);
6191 mddev
->pers
->quiesce(mddev
, 0);
6192 mddev
->bitmap_info
.offset
= 0;
6195 md_update_sb(mddev
, 1);
6199 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6201 struct md_rdev
*rdev
;
6204 if (mddev
->pers
== NULL
)
6208 rdev
= find_rdev_rcu(mddev
, dev
);
6212 md_error(mddev
, rdev
);
6213 if (!test_bit(Faulty
, &rdev
->flags
))
6221 * We have a problem here : there is no easy way to give a CHS
6222 * virtual geometry. We currently pretend that we have a 2 heads
6223 * 4 sectors (with a BIG number of cylinders...). This drives
6224 * dosfs just mad... ;-)
6226 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6228 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6232 geo
->cylinders
= mddev
->array_sectors
/ 8;
6236 static inline bool md_ioctl_valid(unsigned int cmd
)
6241 case GET_ARRAY_INFO
:
6242 case GET_BITMAP_FILE
:
6245 case HOT_REMOVE_DISK
:
6248 case RESTART_ARRAY_RW
:
6250 case SET_ARRAY_INFO
:
6251 case SET_BITMAP_FILE
:
6252 case SET_DISK_FAULTY
:
6261 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6262 unsigned int cmd
, unsigned long arg
)
6265 void __user
*argp
= (void __user
*)arg
;
6266 struct mddev
*mddev
= NULL
;
6269 if (!md_ioctl_valid(cmd
))
6274 case GET_ARRAY_INFO
:
6278 if (!capable(CAP_SYS_ADMIN
))
6283 * Commands dealing with the RAID driver but not any
6288 err
= get_version(argp
);
6294 autostart_arrays(arg
);
6301 * Commands creating/starting a new array:
6304 mddev
= bdev
->bd_disk
->private_data
;
6311 /* Some actions do not requires the mutex */
6313 case GET_ARRAY_INFO
:
6314 if (!mddev
->raid_disks
&& !mddev
->external
)
6317 err
= get_array_info(mddev
, argp
);
6321 if (!mddev
->raid_disks
&& !mddev
->external
)
6324 err
= get_disk_info(mddev
, argp
);
6327 case SET_DISK_FAULTY
:
6328 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6331 case GET_BITMAP_FILE
:
6332 err
= get_bitmap_file(mddev
, argp
);
6337 if (cmd
== ADD_NEW_DISK
)
6338 /* need to ensure md_delayed_delete() has completed */
6339 flush_workqueue(md_misc_wq
);
6341 if (cmd
== HOT_REMOVE_DISK
)
6342 /* need to ensure recovery thread has run */
6343 wait_event_interruptible_timeout(mddev
->sb_wait
,
6344 !test_bit(MD_RECOVERY_NEEDED
,
6346 msecs_to_jiffies(5000));
6347 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6348 /* Need to flush page cache, and ensure no-one else opens
6351 mutex_lock(&mddev
->open_mutex
);
6352 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6353 mutex_unlock(&mddev
->open_mutex
);
6357 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6358 mutex_unlock(&mddev
->open_mutex
);
6359 sync_blockdev(bdev
);
6361 err
= mddev_lock(mddev
);
6364 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6369 if (cmd
== SET_ARRAY_INFO
) {
6370 mdu_array_info_t info
;
6372 memset(&info
, 0, sizeof(info
));
6373 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6378 err
= update_array_info(mddev
, &info
);
6380 printk(KERN_WARNING
"md: couldn't update"
6381 " array info. %d\n", err
);
6386 if (!list_empty(&mddev
->disks
)) {
6388 "md: array %s already has disks!\n",
6393 if (mddev
->raid_disks
) {
6395 "md: array %s already initialised!\n",
6400 err
= set_array_info(mddev
, &info
);
6402 printk(KERN_WARNING
"md: couldn't set"
6403 " array info. %d\n", err
);
6410 * Commands querying/configuring an existing array:
6412 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6413 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6414 if ((!mddev
->raid_disks
&& !mddev
->external
)
6415 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6416 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6417 && cmd
!= GET_BITMAP_FILE
) {
6423 * Commands even a read-only array can execute:
6426 case RESTART_ARRAY_RW
:
6427 err
= restart_array(mddev
);
6431 err
= do_md_stop(mddev
, 0, bdev
);
6435 err
= md_set_readonly(mddev
, bdev
);
6438 case HOT_REMOVE_DISK
:
6439 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6443 /* We can support ADD_NEW_DISK on read-only arrays
6444 * on if we are re-adding a preexisting device.
6445 * So require mddev->pers and MD_DISK_SYNC.
6448 mdu_disk_info_t info
;
6449 if (copy_from_user(&info
, argp
, sizeof(info
)))
6451 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6452 /* Need to clear read-only for this */
6455 err
= add_new_disk(mddev
, &info
);
6461 if (get_user(ro
, (int __user
*)(arg
))) {
6467 /* if the bdev is going readonly the value of mddev->ro
6468 * does not matter, no writes are coming
6473 /* are we are already prepared for writes? */
6477 /* transitioning to readauto need only happen for
6478 * arrays that call md_write_start
6481 err
= restart_array(mddev
);
6484 set_disk_ro(mddev
->gendisk
, 0);
6491 * The remaining ioctls are changing the state of the
6492 * superblock, so we do not allow them on read-only arrays.
6494 if (mddev
->ro
&& mddev
->pers
) {
6495 if (mddev
->ro
== 2) {
6497 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6498 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6499 /* mddev_unlock will wake thread */
6500 /* If a device failed while we were read-only, we
6501 * need to make sure the metadata is updated now.
6503 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6504 mddev_unlock(mddev
);
6505 wait_event(mddev
->sb_wait
,
6506 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6507 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6508 mddev_lock_nointr(mddev
);
6519 mdu_disk_info_t info
;
6520 if (copy_from_user(&info
, argp
, sizeof(info
)))
6523 err
= add_new_disk(mddev
, &info
);
6528 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6532 err
= do_md_run(mddev
);
6535 case SET_BITMAP_FILE
:
6536 err
= set_bitmap_file(mddev
, (int)arg
);
6545 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6547 mddev
->hold_active
= 0;
6548 mddev_unlock(mddev
);
6552 #ifdef CONFIG_COMPAT
6553 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6554 unsigned int cmd
, unsigned long arg
)
6557 case HOT_REMOVE_DISK
:
6559 case SET_DISK_FAULTY
:
6560 case SET_BITMAP_FILE
:
6561 /* These take in integer arg, do not convert */
6564 arg
= (unsigned long)compat_ptr(arg
);
6568 return md_ioctl(bdev
, mode
, cmd
, arg
);
6570 #endif /* CONFIG_COMPAT */
6572 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6575 * Succeed if we can lock the mddev, which confirms that
6576 * it isn't being stopped right now.
6578 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6584 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6585 /* we are racing with mddev_put which is discarding this
6589 /* Wait until bdev->bd_disk is definitely gone */
6590 flush_workqueue(md_misc_wq
);
6591 /* Then retry the open from the top */
6592 return -ERESTARTSYS
;
6594 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6596 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6600 atomic_inc(&mddev
->openers
);
6601 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6602 mutex_unlock(&mddev
->open_mutex
);
6604 check_disk_change(bdev
);
6609 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6611 struct mddev
*mddev
= disk
->private_data
;
6614 atomic_dec(&mddev
->openers
);
6618 static int md_media_changed(struct gendisk
*disk
)
6620 struct mddev
*mddev
= disk
->private_data
;
6622 return mddev
->changed
;
6625 static int md_revalidate(struct gendisk
*disk
)
6627 struct mddev
*mddev
= disk
->private_data
;
6632 static const struct block_device_operations md_fops
=
6634 .owner
= THIS_MODULE
,
6636 .release
= md_release
,
6638 #ifdef CONFIG_COMPAT
6639 .compat_ioctl
= md_compat_ioctl
,
6641 .getgeo
= md_getgeo
,
6642 .media_changed
= md_media_changed
,
6643 .revalidate_disk
= md_revalidate
,
6646 static int md_thread(void *arg
)
6648 struct md_thread
*thread
= arg
;
6651 * md_thread is a 'system-thread', it's priority should be very
6652 * high. We avoid resource deadlocks individually in each
6653 * raid personality. (RAID5 does preallocation) We also use RR and
6654 * the very same RT priority as kswapd, thus we will never get
6655 * into a priority inversion deadlock.
6657 * we definitely have to have equal or higher priority than
6658 * bdflush, otherwise bdflush will deadlock if there are too
6659 * many dirty RAID5 blocks.
6662 allow_signal(SIGKILL
);
6663 while (!kthread_should_stop()) {
6665 /* We need to wait INTERRUPTIBLE so that
6666 * we don't add to the load-average.
6667 * That means we need to be sure no signals are
6670 if (signal_pending(current
))
6671 flush_signals(current
);
6673 wait_event_interruptible_timeout
6675 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6676 || kthread_should_stop(),
6679 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6680 if (!kthread_should_stop())
6681 thread
->run(thread
);
6687 void md_wakeup_thread(struct md_thread
*thread
)
6690 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6691 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6692 wake_up(&thread
->wqueue
);
6695 EXPORT_SYMBOL(md_wakeup_thread
);
6697 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6698 struct mddev
*mddev
, const char *name
)
6700 struct md_thread
*thread
;
6702 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6706 init_waitqueue_head(&thread
->wqueue
);
6709 thread
->mddev
= mddev
;
6710 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6711 thread
->tsk
= kthread_run(md_thread
, thread
,
6713 mdname(thread
->mddev
),
6715 if (IS_ERR(thread
->tsk
)) {
6721 EXPORT_SYMBOL(md_register_thread
);
6723 void md_unregister_thread(struct md_thread
**threadp
)
6725 struct md_thread
*thread
= *threadp
;
6728 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6729 /* Locking ensures that mddev_unlock does not wake_up a
6730 * non-existent thread
6732 spin_lock(&pers_lock
);
6734 spin_unlock(&pers_lock
);
6736 kthread_stop(thread
->tsk
);
6739 EXPORT_SYMBOL(md_unregister_thread
);
6741 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6743 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6746 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6748 mddev
->pers
->error_handler(mddev
,rdev
);
6749 if (mddev
->degraded
)
6750 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6751 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6752 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6753 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6754 md_wakeup_thread(mddev
->thread
);
6755 if (mddev
->event_work
.func
)
6756 queue_work(md_misc_wq
, &mddev
->event_work
);
6757 md_new_event_inintr(mddev
);
6759 EXPORT_SYMBOL(md_error
);
6761 /* seq_file implementation /proc/mdstat */
6763 static void status_unused(struct seq_file
*seq
)
6766 struct md_rdev
*rdev
;
6768 seq_printf(seq
, "unused devices: ");
6770 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6771 char b
[BDEVNAME_SIZE
];
6773 seq_printf(seq
, "%s ",
6774 bdevname(rdev
->bdev
,b
));
6777 seq_printf(seq
, "<none>");
6779 seq_printf(seq
, "\n");
6782 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
6784 sector_t max_sectors
, resync
, res
;
6785 unsigned long dt
, db
;
6788 unsigned int per_milli
;
6790 if (mddev
->curr_resync
<= 3)
6793 resync
= mddev
->curr_resync
6794 - atomic_read(&mddev
->recovery_active
);
6796 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6797 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6798 max_sectors
= mddev
->resync_max_sectors
;
6800 max_sectors
= mddev
->dev_sectors
;
6802 WARN_ON(max_sectors
== 0);
6803 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6804 * in a sector_t, and (max_sectors>>scale) will fit in a
6805 * u32, as those are the requirements for sector_div.
6806 * Thus 'scale' must be at least 10
6809 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6810 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6813 res
= (resync
>>scale
)*1000;
6814 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6818 int i
, x
= per_milli
/50, y
= 20-x
;
6819 seq_printf(seq
, "[");
6820 for (i
= 0; i
< x
; i
++)
6821 seq_printf(seq
, "=");
6822 seq_printf(seq
, ">");
6823 for (i
= 0; i
< y
; i
++)
6824 seq_printf(seq
, ".");
6825 seq_printf(seq
, "] ");
6827 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6828 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6830 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6832 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6833 "resync" : "recovery"))),
6834 per_milli
/10, per_milli
% 10,
6835 (unsigned long long) resync
/2,
6836 (unsigned long long) max_sectors
/2);
6839 * dt: time from mark until now
6840 * db: blocks written from mark until now
6841 * rt: remaining time
6843 * rt is a sector_t, so could be 32bit or 64bit.
6844 * So we divide before multiply in case it is 32bit and close
6846 * We scale the divisor (db) by 32 to avoid losing precision
6847 * near the end of resync when the number of remaining sectors
6849 * We then divide rt by 32 after multiplying by db to compensate.
6850 * The '+1' avoids division by zero if db is very small.
6852 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6854 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6855 - mddev
->resync_mark_cnt
;
6857 rt
= max_sectors
- resync
; /* number of remaining sectors */
6858 sector_div(rt
, db
/32+1);
6862 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6863 ((unsigned long)rt
% 60)/6);
6865 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6868 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6870 struct list_head
*tmp
;
6872 struct mddev
*mddev
;
6880 spin_lock(&all_mddevs_lock
);
6881 list_for_each(tmp
,&all_mddevs
)
6883 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6885 spin_unlock(&all_mddevs_lock
);
6888 spin_unlock(&all_mddevs_lock
);
6890 return (void*)2;/* tail */
6894 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6896 struct list_head
*tmp
;
6897 struct mddev
*next_mddev
, *mddev
= v
;
6903 spin_lock(&all_mddevs_lock
);
6905 tmp
= all_mddevs
.next
;
6907 tmp
= mddev
->all_mddevs
.next
;
6908 if (tmp
!= &all_mddevs
)
6909 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6911 next_mddev
= (void*)2;
6914 spin_unlock(&all_mddevs_lock
);
6922 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6924 struct mddev
*mddev
= v
;
6926 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6930 static int md_seq_show(struct seq_file
*seq
, void *v
)
6932 struct mddev
*mddev
= v
;
6934 struct md_rdev
*rdev
;
6936 if (v
== (void*)1) {
6937 struct md_personality
*pers
;
6938 seq_printf(seq
, "Personalities : ");
6939 spin_lock(&pers_lock
);
6940 list_for_each_entry(pers
, &pers_list
, list
)
6941 seq_printf(seq
, "[%s] ", pers
->name
);
6943 spin_unlock(&pers_lock
);
6944 seq_printf(seq
, "\n");
6945 seq
->poll_event
= atomic_read(&md_event_count
);
6948 if (v
== (void*)2) {
6953 spin_lock(&mddev
->lock
);
6954 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6955 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6956 mddev
->pers
? "" : "in");
6959 seq_printf(seq
, " (read-only)");
6961 seq_printf(seq
, " (auto-read-only)");
6962 seq_printf(seq
, " %s", mddev
->pers
->name
);
6967 rdev_for_each_rcu(rdev
, mddev
) {
6968 char b
[BDEVNAME_SIZE
];
6969 seq_printf(seq
, " %s[%d]",
6970 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6971 if (test_bit(WriteMostly
, &rdev
->flags
))
6972 seq_printf(seq
, "(W)");
6973 if (test_bit(Faulty
, &rdev
->flags
)) {
6974 seq_printf(seq
, "(F)");
6977 if (rdev
->raid_disk
< 0)
6978 seq_printf(seq
, "(S)"); /* spare */
6979 if (test_bit(Replacement
, &rdev
->flags
))
6980 seq_printf(seq
, "(R)");
6981 sectors
+= rdev
->sectors
;
6985 if (!list_empty(&mddev
->disks
)) {
6987 seq_printf(seq
, "\n %llu blocks",
6988 (unsigned long long)
6989 mddev
->array_sectors
/ 2);
6991 seq_printf(seq
, "\n %llu blocks",
6992 (unsigned long long)sectors
/ 2);
6994 if (mddev
->persistent
) {
6995 if (mddev
->major_version
!= 0 ||
6996 mddev
->minor_version
!= 90) {
6997 seq_printf(seq
," super %d.%d",
6998 mddev
->major_version
,
6999 mddev
->minor_version
);
7001 } else if (mddev
->external
)
7002 seq_printf(seq
, " super external:%s",
7003 mddev
->metadata_type
);
7005 seq_printf(seq
, " super non-persistent");
7008 mddev
->pers
->status(seq
, mddev
);
7009 seq_printf(seq
, "\n ");
7010 if (mddev
->pers
->sync_request
) {
7011 if (mddev
->curr_resync
> 2) {
7012 status_resync(seq
, mddev
);
7013 seq_printf(seq
, "\n ");
7014 } else if (mddev
->curr_resync
>= 1)
7015 seq_printf(seq
, "\tresync=DELAYED\n ");
7016 else if (mddev
->recovery_cp
< MaxSector
)
7017 seq_printf(seq
, "\tresync=PENDING\n ");
7020 seq_printf(seq
, "\n ");
7022 bitmap_status(seq
, mddev
->bitmap
);
7024 seq_printf(seq
, "\n");
7026 spin_unlock(&mddev
->lock
);
7031 static const struct seq_operations md_seq_ops
= {
7032 .start
= md_seq_start
,
7033 .next
= md_seq_next
,
7034 .stop
= md_seq_stop
,
7035 .show
= md_seq_show
,
7038 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7040 struct seq_file
*seq
;
7043 error
= seq_open(file
, &md_seq_ops
);
7047 seq
= file
->private_data
;
7048 seq
->poll_event
= atomic_read(&md_event_count
);
7052 static int md_unloading
;
7053 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7055 struct seq_file
*seq
= filp
->private_data
;
7059 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7060 poll_wait(filp
, &md_event_waiters
, wait
);
7062 /* always allow read */
7063 mask
= POLLIN
| POLLRDNORM
;
7065 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7066 mask
|= POLLERR
| POLLPRI
;
7070 static const struct file_operations md_seq_fops
= {
7071 .owner
= THIS_MODULE
,
7072 .open
= md_seq_open
,
7074 .llseek
= seq_lseek
,
7075 .release
= seq_release_private
,
7076 .poll
= mdstat_poll
,
7079 int register_md_personality(struct md_personality
*p
)
7081 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7083 spin_lock(&pers_lock
);
7084 list_add_tail(&p
->list
, &pers_list
);
7085 spin_unlock(&pers_lock
);
7088 EXPORT_SYMBOL(register_md_personality
);
7090 int unregister_md_personality(struct md_personality
*p
)
7092 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7093 spin_lock(&pers_lock
);
7094 list_del_init(&p
->list
);
7095 spin_unlock(&pers_lock
);
7098 EXPORT_SYMBOL(unregister_md_personality
);
7100 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7102 struct md_rdev
*rdev
;
7108 rdev_for_each_rcu(rdev
, mddev
) {
7109 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7110 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7111 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7112 atomic_read(&disk
->sync_io
);
7113 /* sync IO will cause sync_io to increase before the disk_stats
7114 * as sync_io is counted when a request starts, and
7115 * disk_stats is counted when it completes.
7116 * So resync activity will cause curr_events to be smaller than
7117 * when there was no such activity.
7118 * non-sync IO will cause disk_stat to increase without
7119 * increasing sync_io so curr_events will (eventually)
7120 * be larger than it was before. Once it becomes
7121 * substantially larger, the test below will cause
7122 * the array to appear non-idle, and resync will slow
7124 * If there is a lot of outstanding resync activity when
7125 * we set last_event to curr_events, then all that activity
7126 * completing might cause the array to appear non-idle
7127 * and resync will be slowed down even though there might
7128 * not have been non-resync activity. This will only
7129 * happen once though. 'last_events' will soon reflect
7130 * the state where there is little or no outstanding
7131 * resync requests, and further resync activity will
7132 * always make curr_events less than last_events.
7135 if (init
|| curr_events
- rdev
->last_events
> 64) {
7136 rdev
->last_events
= curr_events
;
7144 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7146 /* another "blocks" (512byte) blocks have been synced */
7147 atomic_sub(blocks
, &mddev
->recovery_active
);
7148 wake_up(&mddev
->recovery_wait
);
7150 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7151 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7152 md_wakeup_thread(mddev
->thread
);
7153 // stop recovery, signal do_sync ....
7156 EXPORT_SYMBOL(md_done_sync
);
7158 /* md_write_start(mddev, bi)
7159 * If we need to update some array metadata (e.g. 'active' flag
7160 * in superblock) before writing, schedule a superblock update
7161 * and wait for it to complete.
7163 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7166 if (bio_data_dir(bi
) != WRITE
)
7169 BUG_ON(mddev
->ro
== 1);
7170 if (mddev
->ro
== 2) {
7171 /* need to switch to read/write */
7173 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7174 md_wakeup_thread(mddev
->thread
);
7175 md_wakeup_thread(mddev
->sync_thread
);
7178 atomic_inc(&mddev
->writes_pending
);
7179 if (mddev
->safemode
== 1)
7180 mddev
->safemode
= 0;
7181 if (mddev
->in_sync
) {
7182 spin_lock(&mddev
->lock
);
7183 if (mddev
->in_sync
) {
7185 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7186 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7187 md_wakeup_thread(mddev
->thread
);
7190 spin_unlock(&mddev
->lock
);
7193 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7194 wait_event(mddev
->sb_wait
,
7195 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7197 EXPORT_SYMBOL(md_write_start
);
7199 void md_write_end(struct mddev
*mddev
)
7201 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7202 if (mddev
->safemode
== 2)
7203 md_wakeup_thread(mddev
->thread
);
7204 else if (mddev
->safemode_delay
)
7205 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7208 EXPORT_SYMBOL(md_write_end
);
7210 /* md_allow_write(mddev)
7211 * Calling this ensures that the array is marked 'active' so that writes
7212 * may proceed without blocking. It is important to call this before
7213 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7214 * Must be called with mddev_lock held.
7216 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7217 * is dropped, so return -EAGAIN after notifying userspace.
7219 int md_allow_write(struct mddev
*mddev
)
7225 if (!mddev
->pers
->sync_request
)
7228 spin_lock(&mddev
->lock
);
7229 if (mddev
->in_sync
) {
7231 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7232 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7233 if (mddev
->safemode_delay
&&
7234 mddev
->safemode
== 0)
7235 mddev
->safemode
= 1;
7236 spin_unlock(&mddev
->lock
);
7237 md_update_sb(mddev
, 0);
7238 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7240 spin_unlock(&mddev
->lock
);
7242 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7247 EXPORT_SYMBOL_GPL(md_allow_write
);
7249 #define SYNC_MARKS 10
7250 #define SYNC_MARK_STEP (3*HZ)
7251 #define UPDATE_FREQUENCY (5*60*HZ)
7252 void md_do_sync(struct md_thread
*thread
)
7254 struct mddev
*mddev
= thread
->mddev
;
7255 struct mddev
*mddev2
;
7256 unsigned int currspeed
= 0,
7258 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7259 unsigned long mark
[SYNC_MARKS
];
7260 unsigned long update_time
;
7261 sector_t mark_cnt
[SYNC_MARKS
];
7263 struct list_head
*tmp
;
7264 sector_t last_check
;
7266 struct md_rdev
*rdev
;
7267 char *desc
, *action
= NULL
;
7268 struct blk_plug plug
;
7270 /* just incase thread restarts... */
7271 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7273 if (mddev
->ro
) {/* never try to sync a read-only array */
7274 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7278 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7279 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7280 desc
= "data-check";
7282 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7283 desc
= "requested-resync";
7287 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7292 mddev
->last_sync_action
= action
?: desc
;
7294 /* we overload curr_resync somewhat here.
7295 * 0 == not engaged in resync at all
7296 * 2 == checking that there is no conflict with another sync
7297 * 1 == like 2, but have yielded to allow conflicting resync to
7299 * other == active in resync - this many blocks
7301 * Before starting a resync we must have set curr_resync to
7302 * 2, and then checked that every "conflicting" array has curr_resync
7303 * less than ours. When we find one that is the same or higher
7304 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7305 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7306 * This will mean we have to start checking from the beginning again.
7311 mddev
->curr_resync
= 2;
7314 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7316 for_each_mddev(mddev2
, tmp
) {
7317 if (mddev2
== mddev
)
7319 if (!mddev
->parallel_resync
7320 && mddev2
->curr_resync
7321 && match_mddev_units(mddev
, mddev2
)) {
7323 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7324 /* arbitrarily yield */
7325 mddev
->curr_resync
= 1;
7326 wake_up(&resync_wait
);
7328 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7329 /* no need to wait here, we can wait the next
7330 * time 'round when curr_resync == 2
7333 /* We need to wait 'interruptible' so as not to
7334 * contribute to the load average, and not to
7335 * be caught by 'softlockup'
7337 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7338 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7339 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7340 printk(KERN_INFO
"md: delaying %s of %s"
7341 " until %s has finished (they"
7342 " share one or more physical units)\n",
7343 desc
, mdname(mddev
), mdname(mddev2
));
7345 if (signal_pending(current
))
7346 flush_signals(current
);
7348 finish_wait(&resync_wait
, &wq
);
7351 finish_wait(&resync_wait
, &wq
);
7354 } while (mddev
->curr_resync
< 2);
7357 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7358 /* resync follows the size requested by the personality,
7359 * which defaults to physical size, but can be virtual size
7361 max_sectors
= mddev
->resync_max_sectors
;
7362 atomic64_set(&mddev
->resync_mismatches
, 0);
7363 /* we don't use the checkpoint if there's a bitmap */
7364 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7365 j
= mddev
->resync_min
;
7366 else if (!mddev
->bitmap
)
7367 j
= mddev
->recovery_cp
;
7369 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7370 max_sectors
= mddev
->resync_max_sectors
;
7372 /* recovery follows the physical size of devices */
7373 max_sectors
= mddev
->dev_sectors
;
7376 rdev_for_each_rcu(rdev
, mddev
)
7377 if (rdev
->raid_disk
>= 0 &&
7378 !test_bit(Faulty
, &rdev
->flags
) &&
7379 !test_bit(In_sync
, &rdev
->flags
) &&
7380 rdev
->recovery_offset
< j
)
7381 j
= rdev
->recovery_offset
;
7384 /* If there is a bitmap, we need to make sure all
7385 * writes that started before we added a spare
7386 * complete before we start doing a recovery.
7387 * Otherwise the write might complete and (via
7388 * bitmap_endwrite) set a bit in the bitmap after the
7389 * recovery has checked that bit and skipped that
7392 if (mddev
->bitmap
) {
7393 mddev
->pers
->quiesce(mddev
, 1);
7394 mddev
->pers
->quiesce(mddev
, 0);
7398 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7399 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7400 " %d KB/sec/disk.\n", speed_min(mddev
));
7401 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7402 "(but not more than %d KB/sec) for %s.\n",
7403 speed_max(mddev
), desc
);
7405 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7408 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7410 mark_cnt
[m
] = io_sectors
;
7413 mddev
->resync_mark
= mark
[last_mark
];
7414 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7417 * Tune reconstruction:
7419 window
= 32*(PAGE_SIZE
/512);
7420 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7421 window
/2, (unsigned long long)max_sectors
/2);
7423 atomic_set(&mddev
->recovery_active
, 0);
7428 "md: resuming %s of %s from checkpoint.\n",
7429 desc
, mdname(mddev
));
7430 mddev
->curr_resync
= j
;
7432 mddev
->curr_resync
= 3; /* no longer delayed */
7433 mddev
->curr_resync_completed
= j
;
7434 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7435 md_new_event(mddev
);
7436 update_time
= jiffies
;
7438 blk_start_plug(&plug
);
7439 while (j
< max_sectors
) {
7444 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7445 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7446 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7447 > (max_sectors
>> 4)) ||
7448 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7449 (j
- mddev
->curr_resync_completed
)*2
7450 >= mddev
->resync_max
- mddev
->curr_resync_completed
7452 /* time to update curr_resync_completed */
7453 wait_event(mddev
->recovery_wait
,
7454 atomic_read(&mddev
->recovery_active
) == 0);
7455 mddev
->curr_resync_completed
= j
;
7456 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7457 j
> mddev
->recovery_cp
)
7458 mddev
->recovery_cp
= j
;
7459 update_time
= jiffies
;
7460 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7461 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7464 while (j
>= mddev
->resync_max
&&
7465 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7466 /* As this condition is controlled by user-space,
7467 * we can block indefinitely, so use '_interruptible'
7468 * to avoid triggering warnings.
7470 flush_signals(current
); /* just in case */
7471 wait_event_interruptible(mddev
->recovery_wait
,
7472 mddev
->resync_max
> j
7473 || test_bit(MD_RECOVERY_INTR
,
7477 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7480 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7481 currspeed
< speed_min(mddev
));
7483 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7487 if (!skipped
) { /* actual IO requested */
7488 io_sectors
+= sectors
;
7489 atomic_add(sectors
, &mddev
->recovery_active
);
7492 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7497 mddev
->curr_resync
= j
;
7498 mddev
->curr_mark_cnt
= io_sectors
;
7499 if (last_check
== 0)
7500 /* this is the earliest that rebuild will be
7501 * visible in /proc/mdstat
7503 md_new_event(mddev
);
7505 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7508 last_check
= io_sectors
;
7510 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7512 int next
= (last_mark
+1) % SYNC_MARKS
;
7514 mddev
->resync_mark
= mark
[next
];
7515 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7516 mark
[next
] = jiffies
;
7517 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7521 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7525 * this loop exits only if either when we are slower than
7526 * the 'hard' speed limit, or the system was IO-idle for
7528 * the system might be non-idle CPU-wise, but we only care
7529 * about not overloading the IO subsystem. (things like an
7530 * e2fsck being done on the RAID array should execute fast)
7534 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7535 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7536 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7538 if (currspeed
> speed_min(mddev
)) {
7539 if ((currspeed
> speed_max(mddev
)) ||
7540 !is_mddev_idle(mddev
, 0)) {
7546 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7547 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7548 ? "interrupted" : "done");
7550 * this also signals 'finished resyncing' to md_stop
7552 blk_finish_plug(&plug
);
7553 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7555 /* tell personality that we are finished */
7556 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7558 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7559 mddev
->curr_resync
> 2) {
7560 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7561 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7562 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7564 "md: checkpointing %s of %s.\n",
7565 desc
, mdname(mddev
));
7566 if (test_bit(MD_RECOVERY_ERROR
,
7568 mddev
->recovery_cp
=
7569 mddev
->curr_resync_completed
;
7571 mddev
->recovery_cp
=
7575 mddev
->recovery_cp
= MaxSector
;
7577 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7578 mddev
->curr_resync
= MaxSector
;
7580 rdev_for_each_rcu(rdev
, mddev
)
7581 if (rdev
->raid_disk
>= 0 &&
7582 mddev
->delta_disks
>= 0 &&
7583 !test_bit(Faulty
, &rdev
->flags
) &&
7584 !test_bit(In_sync
, &rdev
->flags
) &&
7585 rdev
->recovery_offset
< mddev
->curr_resync
)
7586 rdev
->recovery_offset
= mddev
->curr_resync
;
7591 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7593 spin_lock(&mddev
->lock
);
7594 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7595 /* We completed so min/max setting can be forgotten if used. */
7596 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7597 mddev
->resync_min
= 0;
7598 mddev
->resync_max
= MaxSector
;
7599 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7600 mddev
->resync_min
= mddev
->curr_resync_completed
;
7601 mddev
->curr_resync
= 0;
7602 spin_unlock(&mddev
->lock
);
7604 wake_up(&resync_wait
);
7605 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7606 md_wakeup_thread(mddev
->thread
);
7609 EXPORT_SYMBOL_GPL(md_do_sync
);
7611 static int remove_and_add_spares(struct mddev
*mddev
,
7612 struct md_rdev
*this)
7614 struct md_rdev
*rdev
;
7618 rdev_for_each(rdev
, mddev
)
7619 if ((this == NULL
|| rdev
== this) &&
7620 rdev
->raid_disk
>= 0 &&
7621 !test_bit(Blocked
, &rdev
->flags
) &&
7622 (test_bit(Faulty
, &rdev
->flags
) ||
7623 ! test_bit(In_sync
, &rdev
->flags
)) &&
7624 atomic_read(&rdev
->nr_pending
)==0) {
7625 if (mddev
->pers
->hot_remove_disk(
7626 mddev
, rdev
) == 0) {
7627 sysfs_unlink_rdev(mddev
, rdev
);
7628 rdev
->raid_disk
= -1;
7632 if (removed
&& mddev
->kobj
.sd
)
7633 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7638 rdev_for_each(rdev
, mddev
) {
7639 if (rdev
->raid_disk
>= 0 &&
7640 !test_bit(In_sync
, &rdev
->flags
) &&
7641 !test_bit(Faulty
, &rdev
->flags
))
7643 if (rdev
->raid_disk
>= 0)
7645 if (test_bit(Faulty
, &rdev
->flags
))
7648 ! (rdev
->saved_raid_disk
>= 0 &&
7649 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7652 if (rdev
->saved_raid_disk
< 0)
7653 rdev
->recovery_offset
= 0;
7655 hot_add_disk(mddev
, rdev
) == 0) {
7656 if (sysfs_link_rdev(mddev
, rdev
))
7657 /* failure here is OK */;
7659 md_new_event(mddev
);
7660 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7665 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7669 static void md_start_sync(struct work_struct
*ws
)
7671 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7673 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7676 if (!mddev
->sync_thread
) {
7677 printk(KERN_ERR
"%s: could not start resync"
7680 /* leave the spares where they are, it shouldn't hurt */
7681 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7682 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7683 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7684 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7685 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7686 wake_up(&resync_wait
);
7687 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7689 if (mddev
->sysfs_action
)
7690 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7692 md_wakeup_thread(mddev
->sync_thread
);
7693 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7694 md_new_event(mddev
);
7698 * This routine is regularly called by all per-raid-array threads to
7699 * deal with generic issues like resync and super-block update.
7700 * Raid personalities that don't have a thread (linear/raid0) do not
7701 * need this as they never do any recovery or update the superblock.
7703 * It does not do any resync itself, but rather "forks" off other threads
7704 * to do that as needed.
7705 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7706 * "->recovery" and create a thread at ->sync_thread.
7707 * When the thread finishes it sets MD_RECOVERY_DONE
7708 * and wakeups up this thread which will reap the thread and finish up.
7709 * This thread also removes any faulty devices (with nr_pending == 0).
7711 * The overall approach is:
7712 * 1/ if the superblock needs updating, update it.
7713 * 2/ If a recovery thread is running, don't do anything else.
7714 * 3/ If recovery has finished, clean up, possibly marking spares active.
7715 * 4/ If there are any faulty devices, remove them.
7716 * 5/ If array is degraded, try to add spares devices
7717 * 6/ If array has spares or is not in-sync, start a resync thread.
7719 void md_check_recovery(struct mddev
*mddev
)
7721 if (mddev
->suspended
)
7725 bitmap_daemon_work(mddev
);
7727 if (signal_pending(current
)) {
7728 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7729 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7731 mddev
->safemode
= 2;
7733 flush_signals(current
);
7736 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7739 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
7740 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7741 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7742 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7743 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7744 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7748 if (mddev_trylock(mddev
)) {
7752 /* On a read-only array we can:
7753 * - remove failed devices
7754 * - add already-in_sync devices if the array itself
7756 * As we only add devices that are already in-sync,
7757 * we can activate the spares immediately.
7759 remove_and_add_spares(mddev
, NULL
);
7760 /* There is no thread, but we need to call
7761 * ->spare_active and clear saved_raid_disk
7763 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7764 md_reap_sync_thread(mddev
);
7765 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7769 if (!mddev
->external
) {
7771 spin_lock(&mddev
->lock
);
7772 if (mddev
->safemode
&&
7773 !atomic_read(&mddev
->writes_pending
) &&
7775 mddev
->recovery_cp
== MaxSector
) {
7778 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7780 if (mddev
->safemode
== 1)
7781 mddev
->safemode
= 0;
7782 spin_unlock(&mddev
->lock
);
7784 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7787 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7788 md_update_sb(mddev
, 0);
7790 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7791 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7792 /* resync/recovery still happening */
7793 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7796 if (mddev
->sync_thread
) {
7797 md_reap_sync_thread(mddev
);
7800 /* Set RUNNING before clearing NEEDED to avoid
7801 * any transients in the value of "sync_action".
7803 mddev
->curr_resync_completed
= 0;
7804 spin_lock(&mddev
->lock
);
7805 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7806 spin_unlock(&mddev
->lock
);
7807 /* Clear some bits that don't mean anything, but
7810 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7811 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7813 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7814 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7816 /* no recovery is running.
7817 * remove any failed drives, then
7818 * add spares if possible.
7819 * Spares are also removed and re-added, to allow
7820 * the personality to fail the re-add.
7823 if (mddev
->reshape_position
!= MaxSector
) {
7824 if (mddev
->pers
->check_reshape
== NULL
||
7825 mddev
->pers
->check_reshape(mddev
) != 0)
7826 /* Cannot proceed */
7828 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7829 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7830 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7831 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7832 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7833 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7834 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7835 } else if (mddev
->recovery_cp
< MaxSector
) {
7836 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7837 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7838 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7839 /* nothing to be done ... */
7842 if (mddev
->pers
->sync_request
) {
7844 /* We are adding a device or devices to an array
7845 * which has the bitmap stored on all devices.
7846 * So make sure all bitmap pages get written
7848 bitmap_write_all(mddev
->bitmap
);
7850 INIT_WORK(&mddev
->del_work
, md_start_sync
);
7851 queue_work(md_misc_wq
, &mddev
->del_work
);
7855 if (!mddev
->sync_thread
) {
7856 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7857 wake_up(&resync_wait
);
7858 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7860 if (mddev
->sysfs_action
)
7861 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7864 wake_up(&mddev
->sb_wait
);
7865 mddev_unlock(mddev
);
7868 EXPORT_SYMBOL(md_check_recovery
);
7870 void md_reap_sync_thread(struct mddev
*mddev
)
7872 struct md_rdev
*rdev
;
7874 /* resync has finished, collect result */
7875 md_unregister_thread(&mddev
->sync_thread
);
7876 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7877 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7879 /* activate any spares */
7880 if (mddev
->pers
->spare_active(mddev
)) {
7881 sysfs_notify(&mddev
->kobj
, NULL
,
7883 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7886 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7887 mddev
->pers
->finish_reshape
)
7888 mddev
->pers
->finish_reshape(mddev
);
7890 /* If array is no-longer degraded, then any saved_raid_disk
7891 * information must be scrapped.
7893 if (!mddev
->degraded
)
7894 rdev_for_each(rdev
, mddev
)
7895 rdev
->saved_raid_disk
= -1;
7897 md_update_sb(mddev
, 1);
7898 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7899 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7900 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7901 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7902 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7903 wake_up(&resync_wait
);
7904 /* flag recovery needed just to double check */
7905 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7906 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7907 md_new_event(mddev
);
7908 if (mddev
->event_work
.func
)
7909 queue_work(md_misc_wq
, &mddev
->event_work
);
7911 EXPORT_SYMBOL(md_reap_sync_thread
);
7913 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7915 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7916 wait_event_timeout(rdev
->blocked_wait
,
7917 !test_bit(Blocked
, &rdev
->flags
) &&
7918 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7919 msecs_to_jiffies(5000));
7920 rdev_dec_pending(rdev
, mddev
);
7922 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7924 void md_finish_reshape(struct mddev
*mddev
)
7926 /* called be personality module when reshape completes. */
7927 struct md_rdev
*rdev
;
7929 rdev_for_each(rdev
, mddev
) {
7930 if (rdev
->data_offset
> rdev
->new_data_offset
)
7931 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
7933 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
7934 rdev
->data_offset
= rdev
->new_data_offset
;
7937 EXPORT_SYMBOL(md_finish_reshape
);
7939 /* Bad block management.
7940 * We can record which blocks on each device are 'bad' and so just
7941 * fail those blocks, or that stripe, rather than the whole device.
7942 * Entries in the bad-block table are 64bits wide. This comprises:
7943 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7944 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7945 * A 'shift' can be set so that larger blocks are tracked and
7946 * consequently larger devices can be covered.
7947 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7949 * Locking of the bad-block table uses a seqlock so md_is_badblock
7950 * might need to retry if it is very unlucky.
7951 * We will sometimes want to check for bad blocks in a bi_end_io function,
7952 * so we use the write_seqlock_irq variant.
7954 * When looking for a bad block we specify a range and want to
7955 * know if any block in the range is bad. So we binary-search
7956 * to the last range that starts at-or-before the given endpoint,
7957 * (or "before the sector after the target range")
7958 * then see if it ends after the given start.
7960 * 0 if there are no known bad blocks in the range
7961 * 1 if there are known bad block which are all acknowledged
7962 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7963 * plus the start/length of the first bad section we overlap.
7965 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7966 sector_t
*first_bad
, int *bad_sectors
)
7972 sector_t target
= s
+ sectors
;
7975 if (bb
->shift
> 0) {
7976 /* round the start down, and the end up */
7978 target
+= (1<<bb
->shift
) - 1;
7979 target
>>= bb
->shift
;
7980 sectors
= target
- s
;
7982 /* 'target' is now the first block after the bad range */
7985 seq
= read_seqbegin(&bb
->lock
);
7990 /* Binary search between lo and hi for 'target'
7991 * i.e. for the last range that starts before 'target'
7993 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7994 * are known not to be the last range before target.
7995 * VARIANT: hi-lo is the number of possible
7996 * ranges, and decreases until it reaches 1
7998 while (hi
- lo
> 1) {
7999 int mid
= (lo
+ hi
) / 2;
8000 sector_t a
= BB_OFFSET(p
[mid
]);
8002 /* This could still be the one, earlier ranges
8006 /* This and later ranges are definitely out. */
8009 /* 'lo' might be the last that started before target, but 'hi' isn't */
8011 /* need to check all range that end after 's' to see if
8012 * any are unacknowledged.
8015 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8016 if (BB_OFFSET(p
[lo
]) < target
) {
8017 /* starts before the end, and finishes after
8018 * the start, so they must overlap
8020 if (rv
!= -1 && BB_ACK(p
[lo
]))
8024 *first_bad
= BB_OFFSET(p
[lo
]);
8025 *bad_sectors
= BB_LEN(p
[lo
]);
8031 if (read_seqretry(&bb
->lock
, seq
))
8036 EXPORT_SYMBOL_GPL(md_is_badblock
);
8039 * Add a range of bad blocks to the table.
8040 * This might extend the table, or might contract it
8041 * if two adjacent ranges can be merged.
8042 * We binary-search to find the 'insertion' point, then
8043 * decide how best to handle it.
8045 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8051 unsigned long flags
;
8054 /* badblocks are disabled */
8058 /* round the start down, and the end up */
8059 sector_t next
= s
+ sectors
;
8061 next
+= (1<<bb
->shift
) - 1;
8066 write_seqlock_irqsave(&bb
->lock
, flags
);
8071 /* Find the last range that starts at-or-before 's' */
8072 while (hi
- lo
> 1) {
8073 int mid
= (lo
+ hi
) / 2;
8074 sector_t a
= BB_OFFSET(p
[mid
]);
8080 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8084 /* we found a range that might merge with the start
8087 sector_t a
= BB_OFFSET(p
[lo
]);
8088 sector_t e
= a
+ BB_LEN(p
[lo
]);
8089 int ack
= BB_ACK(p
[lo
]);
8091 /* Yes, we can merge with a previous range */
8092 if (s
== a
&& s
+ sectors
>= e
)
8093 /* new range covers old */
8096 ack
= ack
&& acknowledged
;
8098 if (e
< s
+ sectors
)
8100 if (e
- a
<= BB_MAX_LEN
) {
8101 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8104 /* does not all fit in one range,
8105 * make p[lo] maximal
8107 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8108 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8114 if (sectors
&& hi
< bb
->count
) {
8115 /* 'hi' points to the first range that starts after 's'.
8116 * Maybe we can merge with the start of that range */
8117 sector_t a
= BB_OFFSET(p
[hi
]);
8118 sector_t e
= a
+ BB_LEN(p
[hi
]);
8119 int ack
= BB_ACK(p
[hi
]);
8120 if (a
<= s
+ sectors
) {
8121 /* merging is possible */
8122 if (e
<= s
+ sectors
) {
8127 ack
= ack
&& acknowledged
;
8130 if (e
- a
<= BB_MAX_LEN
) {
8131 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8134 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8142 if (sectors
== 0 && hi
< bb
->count
) {
8143 /* we might be able to combine lo and hi */
8144 /* Note: 's' is at the end of 'lo' */
8145 sector_t a
= BB_OFFSET(p
[hi
]);
8146 int lolen
= BB_LEN(p
[lo
]);
8147 int hilen
= BB_LEN(p
[hi
]);
8148 int newlen
= lolen
+ hilen
- (s
- a
);
8149 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8150 /* yes, we can combine them */
8151 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8152 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8153 memmove(p
+ hi
, p
+ hi
+ 1,
8154 (bb
->count
- hi
- 1) * 8);
8159 /* didn't merge (it all).
8160 * Need to add a range just before 'hi' */
8161 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8162 /* No room for more */
8166 int this_sectors
= sectors
;
8167 memmove(p
+ hi
+ 1, p
+ hi
,
8168 (bb
->count
- hi
) * 8);
8171 if (this_sectors
> BB_MAX_LEN
)
8172 this_sectors
= BB_MAX_LEN
;
8173 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8174 sectors
-= this_sectors
;
8181 bb
->unacked_exist
= 1;
8182 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8187 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8192 s
+= rdev
->new_data_offset
;
8194 s
+= rdev
->data_offset
;
8195 rv
= md_set_badblocks(&rdev
->badblocks
,
8198 /* Make sure they get written out promptly */
8199 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8200 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8201 md_wakeup_thread(rdev
->mddev
->thread
);
8205 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8208 * Remove a range of bad blocks from the table.
8209 * This may involve extending the table if we spilt a region,
8210 * but it must not fail. So if the table becomes full, we just
8211 * drop the remove request.
8213 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8217 sector_t target
= s
+ sectors
;
8220 if (bb
->shift
> 0) {
8221 /* When clearing we round the start up and the end down.
8222 * This should not matter as the shift should align with
8223 * the block size and no rounding should ever be needed.
8224 * However it is better the think a block is bad when it
8225 * isn't than to think a block is not bad when it is.
8227 s
+= (1<<bb
->shift
) - 1;
8229 target
>>= bb
->shift
;
8230 sectors
= target
- s
;
8233 write_seqlock_irq(&bb
->lock
);
8238 /* Find the last range that starts before 'target' */
8239 while (hi
- lo
> 1) {
8240 int mid
= (lo
+ hi
) / 2;
8241 sector_t a
= BB_OFFSET(p
[mid
]);
8248 /* p[lo] is the last range that could overlap the
8249 * current range. Earlier ranges could also overlap,
8250 * but only this one can overlap the end of the range.
8252 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8253 /* Partial overlap, leave the tail of this range */
8254 int ack
= BB_ACK(p
[lo
]);
8255 sector_t a
= BB_OFFSET(p
[lo
]);
8256 sector_t end
= a
+ BB_LEN(p
[lo
]);
8259 /* we need to split this range */
8260 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8264 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8266 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8269 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8270 /* there is no longer an overlap */
8275 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8276 /* This range does overlap */
8277 if (BB_OFFSET(p
[lo
]) < s
) {
8278 /* Keep the early parts of this range. */
8279 int ack
= BB_ACK(p
[lo
]);
8280 sector_t start
= BB_OFFSET(p
[lo
]);
8281 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8282 /* now low doesn't overlap, so.. */
8287 /* 'lo' is strictly before, 'hi' is strictly after,
8288 * anything between needs to be discarded
8291 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8292 bb
->count
-= (hi
- lo
- 1);
8298 write_sequnlock_irq(&bb
->lock
);
8302 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8306 s
+= rdev
->new_data_offset
;
8308 s
+= rdev
->data_offset
;
8309 return md_clear_badblocks(&rdev
->badblocks
,
8312 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8315 * Acknowledge all bad blocks in a list.
8316 * This only succeeds if ->changed is clear. It is used by
8317 * in-kernel metadata updates
8319 void md_ack_all_badblocks(struct badblocks
*bb
)
8321 if (bb
->page
== NULL
|| bb
->changed
)
8322 /* no point even trying */
8324 write_seqlock_irq(&bb
->lock
);
8326 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8329 for (i
= 0; i
< bb
->count
; i
++) {
8330 if (!BB_ACK(p
[i
])) {
8331 sector_t start
= BB_OFFSET(p
[i
]);
8332 int len
= BB_LEN(p
[i
]);
8333 p
[i
] = BB_MAKE(start
, len
, 1);
8336 bb
->unacked_exist
= 0;
8338 write_sequnlock_irq(&bb
->lock
);
8340 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8342 /* sysfs access to bad-blocks list.
8343 * We present two files.
8344 * 'bad-blocks' lists sector numbers and lengths of ranges that
8345 * are recorded as bad. The list is truncated to fit within
8346 * the one-page limit of sysfs.
8347 * Writing "sector length" to this file adds an acknowledged
8349 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8350 * been acknowledged. Writing to this file adds bad blocks
8351 * without acknowledging them. This is largely for testing.
8355 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8366 seq
= read_seqbegin(&bb
->lock
);
8371 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8372 sector_t s
= BB_OFFSET(p
[i
]);
8373 unsigned int length
= BB_LEN(p
[i
]);
8374 int ack
= BB_ACK(p
[i
]);
8380 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8381 (unsigned long long)s
<< bb
->shift
,
8382 length
<< bb
->shift
);
8384 if (unack
&& len
== 0)
8385 bb
->unacked_exist
= 0;
8387 if (read_seqretry(&bb
->lock
, seq
))
8396 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8398 unsigned long long sector
;
8402 /* Allow clearing via sysfs *only* for testing/debugging.
8403 * Normally only a successful write may clear a badblock
8406 if (page
[0] == '-') {
8410 #endif /* DO_DEBUG */
8412 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8414 if (newline
!= '\n')
8426 md_clear_badblocks(bb
, sector
, length
);
8429 #endif /* DO_DEBUG */
8430 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8436 static int md_notify_reboot(struct notifier_block
*this,
8437 unsigned long code
, void *x
)
8439 struct list_head
*tmp
;
8440 struct mddev
*mddev
;
8443 for_each_mddev(mddev
, tmp
) {
8444 if (mddev_trylock(mddev
)) {
8446 __md_stop_writes(mddev
);
8447 if (mddev
->persistent
)
8448 mddev
->safemode
= 2;
8449 mddev_unlock(mddev
);
8454 * certain more exotic SCSI devices are known to be
8455 * volatile wrt too early system reboots. While the
8456 * right place to handle this issue is the given
8457 * driver, we do want to have a safe RAID driver ...
8465 static struct notifier_block md_notifier
= {
8466 .notifier_call
= md_notify_reboot
,
8468 .priority
= INT_MAX
, /* before any real devices */
8471 static void md_geninit(void)
8473 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8475 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8478 static int __init
md_init(void)
8482 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8486 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8490 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8493 if ((ret
= register_blkdev(0, "mdp")) < 0)
8497 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8498 md_probe
, NULL
, NULL
);
8499 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8500 md_probe
, NULL
, NULL
);
8502 register_reboot_notifier(&md_notifier
);
8503 raid_table_header
= register_sysctl_table(raid_root_table
);
8509 unregister_blkdev(MD_MAJOR
, "md");
8511 destroy_workqueue(md_misc_wq
);
8513 destroy_workqueue(md_wq
);
8521 * Searches all registered partitions for autorun RAID arrays
8525 static LIST_HEAD(all_detected_devices
);
8526 struct detected_devices_node
{
8527 struct list_head list
;
8531 void md_autodetect_dev(dev_t dev
)
8533 struct detected_devices_node
*node_detected_dev
;
8535 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8536 if (node_detected_dev
) {
8537 node_detected_dev
->dev
= dev
;
8538 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8540 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8541 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8545 static void autostart_arrays(int part
)
8547 struct md_rdev
*rdev
;
8548 struct detected_devices_node
*node_detected_dev
;
8550 int i_scanned
, i_passed
;
8555 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8557 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8559 node_detected_dev
= list_entry(all_detected_devices
.next
,
8560 struct detected_devices_node
, list
);
8561 list_del(&node_detected_dev
->list
);
8562 dev
= node_detected_dev
->dev
;
8563 kfree(node_detected_dev
);
8564 rdev
= md_import_device(dev
,0, 90);
8568 if (test_bit(Faulty
, &rdev
->flags
))
8571 set_bit(AutoDetected
, &rdev
->flags
);
8572 list_add(&rdev
->same_set
, &pending_raid_disks
);
8576 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8577 i_scanned
, i_passed
);
8579 autorun_devices(part
);
8582 #endif /* !MODULE */
8584 static __exit
void md_exit(void)
8586 struct mddev
*mddev
;
8587 struct list_head
*tmp
;
8590 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8591 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8593 unregister_blkdev(MD_MAJOR
,"md");
8594 unregister_blkdev(mdp_major
, "mdp");
8595 unregister_reboot_notifier(&md_notifier
);
8596 unregister_sysctl_table(raid_table_header
);
8598 /* We cannot unload the modules while some process is
8599 * waiting for us in select() or poll() - wake them up
8602 while (waitqueue_active(&md_event_waiters
)) {
8603 /* not safe to leave yet */
8604 wake_up(&md_event_waiters
);
8608 remove_proc_entry("mdstat", NULL
);
8610 for_each_mddev(mddev
, tmp
) {
8611 export_array(mddev
);
8612 mddev
->hold_active
= 0;
8614 destroy_workqueue(md_misc_wq
);
8615 destroy_workqueue(md_wq
);
8618 subsys_initcall(md_init
);
8619 module_exit(md_exit
)
8621 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8623 return sprintf(buffer
, "%d", start_readonly
);
8625 static int set_ro(const char *val
, struct kernel_param
*kp
)
8628 int num
= simple_strtoul(val
, &e
, 10);
8629 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8630 start_readonly
= num
;
8636 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8637 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8638 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8640 MODULE_LICENSE("GPL");
8641 MODULE_DESCRIPTION("MD RAID framework");
8643 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);