2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
56 #include "md-cluster.h"
59 static void autostart_arrays(int part
);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list
);
68 static DEFINE_SPINLOCK(pers_lock
);
70 struct md_cluster_operations
*md_cluster_ops
;
71 EXPORT_SYMBOL(md_cluster_ops
);
72 struct module
*md_cluster_mod
;
73 EXPORT_SYMBOL(md_cluster_mod
);
75 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
76 static struct workqueue_struct
*md_wq
;
77 static struct workqueue_struct
*md_misc_wq
;
79 static int remove_and_add_spares(struct mddev
*mddev
,
80 struct md_rdev
*this);
81 static void mddev_detach(struct mddev
*mddev
);
84 * Default number of read corrections we'll attempt on an rdev
85 * before ejecting it from the array. We divide the read error
86 * count by 2 for every hour elapsed between read errors.
88 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
90 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
91 * is 1000 KB/sec, so the extra system load does not show up that much.
92 * Increase it if you want to have more _guaranteed_ speed. Note that
93 * the RAID driver will use the maximum available bandwidth if the IO
94 * subsystem is idle. There is also an 'absolute maximum' reconstruction
95 * speed limit - in case reconstruction slows down your system despite
98 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
99 * or /sys/block/mdX/md/sync_speed_{min,max}
102 static int sysctl_speed_limit_min
= 1000;
103 static int sysctl_speed_limit_max
= 200000;
104 static inline int speed_min(struct mddev
*mddev
)
106 return mddev
->sync_speed_min
?
107 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
110 static inline int speed_max(struct mddev
*mddev
)
112 return mddev
->sync_speed_max
?
113 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
116 static struct ctl_table_header
*raid_table_header
;
118 static struct ctl_table raid_table
[] = {
120 .procname
= "speed_limit_min",
121 .data
= &sysctl_speed_limit_min
,
122 .maxlen
= sizeof(int),
123 .mode
= S_IRUGO
|S_IWUSR
,
124 .proc_handler
= proc_dointvec
,
127 .procname
= "speed_limit_max",
128 .data
= &sysctl_speed_limit_max
,
129 .maxlen
= sizeof(int),
130 .mode
= S_IRUGO
|S_IWUSR
,
131 .proc_handler
= proc_dointvec
,
136 static struct ctl_table raid_dir_table
[] = {
140 .mode
= S_IRUGO
|S_IXUGO
,
146 static struct ctl_table raid_root_table
[] = {
151 .child
= raid_dir_table
,
156 static const struct block_device_operations md_fops
;
158 static int start_readonly
;
161 * like bio_clone, but with a local bio set
164 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
169 if (!mddev
|| !mddev
->bio_set
)
170 return bio_alloc(gfp_mask
, nr_iovecs
);
172 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
177 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
179 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
182 if (!mddev
|| !mddev
->bio_set
)
183 return bio_clone(bio
, gfp_mask
);
185 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
187 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
190 * We have a system wide 'event count' that is incremented
191 * on any 'interesting' event, and readers of /proc/mdstat
192 * can use 'poll' or 'select' to find out when the event
196 * start array, stop array, error, add device, remove device,
197 * start build, activate spare
199 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
200 static atomic_t md_event_count
;
201 void md_new_event(struct mddev
*mddev
)
203 atomic_inc(&md_event_count
);
204 wake_up(&md_event_waiters
);
206 EXPORT_SYMBOL_GPL(md_new_event
);
208 /* Alternate version that can be called from interrupts
209 * when calling sysfs_notify isn't needed.
211 static void md_new_event_inintr(struct mddev
*mddev
)
213 atomic_inc(&md_event_count
);
214 wake_up(&md_event_waiters
);
218 * Enables to iterate over all existing md arrays
219 * all_mddevs_lock protects this list.
221 static LIST_HEAD(all_mddevs
);
222 static DEFINE_SPINLOCK(all_mddevs_lock
);
225 * iterates through all used mddevs in the system.
226 * We take care to grab the all_mddevs_lock whenever navigating
227 * the list, and to always hold a refcount when unlocked.
228 * Any code which breaks out of this loop while own
229 * a reference to the current mddev and must mddev_put it.
231 #define for_each_mddev(_mddev,_tmp) \
233 for (({ spin_lock(&all_mddevs_lock); \
234 _tmp = all_mddevs.next; \
236 ({ if (_tmp != &all_mddevs) \
237 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
238 spin_unlock(&all_mddevs_lock); \
239 if (_mddev) mddev_put(_mddev); \
240 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
241 _tmp != &all_mddevs;}); \
242 ({ spin_lock(&all_mddevs_lock); \
243 _tmp = _tmp->next;}) \
246 /* Rather than calling directly into the personality make_request function,
247 * IO requests come here first so that we can check if the device is
248 * being suspended pending a reconfiguration.
249 * We hold a refcount over the call to ->make_request. By the time that
250 * call has finished, the bio has been linked into some internal structure
251 * and so is visible to ->quiesce(), so we don't need the refcount any more.
253 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
255 const int rw
= bio_data_dir(bio
);
256 struct mddev
*mddev
= q
->queuedata
;
257 unsigned int sectors
;
259 if (mddev
== NULL
|| mddev
->pers
== NULL
264 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
265 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev
->suspended
) {
273 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
274 TASK_UNINTERRUPTIBLE
);
275 if (!mddev
->suspended
)
281 finish_wait(&mddev
->sb_wait
, &__wait
);
283 atomic_inc(&mddev
->active_io
);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors
= bio_sectors(bio
);
291 mddev
->pers
->make_request(mddev
, bio
);
293 generic_start_io_acct(rw
, sectors
, &mddev
->gendisk
->part0
);
295 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
296 wake_up(&mddev
->sb_wait
);
299 /* mddev_suspend makes sure no new requests are submitted
300 * to the device, and that any requests that have been submitted
301 * are completely handled.
302 * Once mddev_detach() is called and completes, the module will be
305 void mddev_suspend(struct mddev
*mddev
)
307 BUG_ON(mddev
->suspended
);
308 mddev
->suspended
= 1;
310 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
311 mddev
->pers
->quiesce(mddev
, 1);
313 del_timer_sync(&mddev
->safemode_timer
);
315 EXPORT_SYMBOL_GPL(mddev_suspend
);
317 void mddev_resume(struct mddev
*mddev
)
319 mddev
->suspended
= 0;
320 wake_up(&mddev
->sb_wait
);
321 mddev
->pers
->quiesce(mddev
, 0);
323 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
324 md_wakeup_thread(mddev
->thread
);
325 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
327 EXPORT_SYMBOL_GPL(mddev_resume
);
329 int mddev_congested(struct mddev
*mddev
, int bits
)
331 struct md_personality
*pers
= mddev
->pers
;
335 if (mddev
->suspended
)
337 else if (pers
&& pers
->congested
)
338 ret
= pers
->congested(mddev
, bits
);
342 EXPORT_SYMBOL_GPL(mddev_congested
);
343 static int md_congested(void *data
, int bits
)
345 struct mddev
*mddev
= data
;
346 return mddev_congested(mddev
, bits
);
349 static int md_mergeable_bvec(struct request_queue
*q
,
350 struct bvec_merge_data
*bvm
,
351 struct bio_vec
*biovec
)
353 struct mddev
*mddev
= q
->queuedata
;
356 if (mddev
->suspended
) {
357 /* Must always allow one vec */
358 if (bvm
->bi_size
== 0)
359 ret
= biovec
->bv_len
;
363 struct md_personality
*pers
= mddev
->pers
;
364 if (pers
&& pers
->mergeable_bvec
)
365 ret
= pers
->mergeable_bvec(mddev
, bvm
, biovec
);
367 ret
= biovec
->bv_len
;
373 * Generic flush handling for md
376 static void md_end_flush(struct bio
*bio
, int err
)
378 struct md_rdev
*rdev
= bio
->bi_private
;
379 struct mddev
*mddev
= rdev
->mddev
;
381 rdev_dec_pending(rdev
, mddev
);
383 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
384 /* The pre-request flush has finished */
385 queue_work(md_wq
, &mddev
->flush_work
);
390 static void md_submit_flush_data(struct work_struct
*ws
);
392 static void submit_flushes(struct work_struct
*ws
)
394 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
395 struct md_rdev
*rdev
;
397 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
398 atomic_set(&mddev
->flush_pending
, 1);
400 rdev_for_each_rcu(rdev
, mddev
)
401 if (rdev
->raid_disk
>= 0 &&
402 !test_bit(Faulty
, &rdev
->flags
)) {
403 /* Take two references, one is dropped
404 * when request finishes, one after
405 * we reclaim rcu_read_lock
408 atomic_inc(&rdev
->nr_pending
);
409 atomic_inc(&rdev
->nr_pending
);
411 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
412 bi
->bi_end_io
= md_end_flush
;
413 bi
->bi_private
= rdev
;
414 bi
->bi_bdev
= rdev
->bdev
;
415 atomic_inc(&mddev
->flush_pending
);
416 submit_bio(WRITE_FLUSH
, bi
);
418 rdev_dec_pending(rdev
, mddev
);
421 if (atomic_dec_and_test(&mddev
->flush_pending
))
422 queue_work(md_wq
, &mddev
->flush_work
);
425 static void md_submit_flush_data(struct work_struct
*ws
)
427 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
428 struct bio
*bio
= mddev
->flush_bio
;
430 if (bio
->bi_iter
.bi_size
== 0)
431 /* an empty barrier - all done */
434 bio
->bi_rw
&= ~REQ_FLUSH
;
435 mddev
->pers
->make_request(mddev
, bio
);
438 mddev
->flush_bio
= NULL
;
439 wake_up(&mddev
->sb_wait
);
442 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
444 spin_lock_irq(&mddev
->lock
);
445 wait_event_lock_irq(mddev
->sb_wait
,
448 mddev
->flush_bio
= bio
;
449 spin_unlock_irq(&mddev
->lock
);
451 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
452 queue_work(md_wq
, &mddev
->flush_work
);
454 EXPORT_SYMBOL(md_flush_request
);
456 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
458 struct mddev
*mddev
= cb
->data
;
459 md_wakeup_thread(mddev
->thread
);
462 EXPORT_SYMBOL(md_unplug
);
464 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
466 atomic_inc(&mddev
->active
);
470 static void mddev_delayed_delete(struct work_struct
*ws
);
472 static void mddev_put(struct mddev
*mddev
)
474 struct bio_set
*bs
= NULL
;
476 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
478 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
479 mddev
->ctime
== 0 && !mddev
->hold_active
) {
480 /* Array is not configured at all, and not held active,
482 list_del_init(&mddev
->all_mddevs
);
484 mddev
->bio_set
= NULL
;
485 if (mddev
->gendisk
) {
486 /* We did a probe so need to clean up. Call
487 * queue_work inside the spinlock so that
488 * flush_workqueue() after mddev_find will
489 * succeed in waiting for the work to be done.
491 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
492 queue_work(md_misc_wq
, &mddev
->del_work
);
496 spin_unlock(&all_mddevs_lock
);
501 void mddev_init(struct mddev
*mddev
)
503 mutex_init(&mddev
->open_mutex
);
504 mutex_init(&mddev
->reconfig_mutex
);
505 mutex_init(&mddev
->bitmap_info
.mutex
);
506 INIT_LIST_HEAD(&mddev
->disks
);
507 INIT_LIST_HEAD(&mddev
->all_mddevs
);
508 init_timer(&mddev
->safemode_timer
);
509 atomic_set(&mddev
->active
, 1);
510 atomic_set(&mddev
->openers
, 0);
511 atomic_set(&mddev
->active_io
, 0);
512 spin_lock_init(&mddev
->lock
);
513 atomic_set(&mddev
->flush_pending
, 0);
514 init_waitqueue_head(&mddev
->sb_wait
);
515 init_waitqueue_head(&mddev
->recovery_wait
);
516 mddev
->reshape_position
= MaxSector
;
517 mddev
->reshape_backwards
= 0;
518 mddev
->last_sync_action
= "none";
519 mddev
->resync_min
= 0;
520 mddev
->resync_max
= MaxSector
;
521 mddev
->level
= LEVEL_NONE
;
523 EXPORT_SYMBOL_GPL(mddev_init
);
525 static struct mddev
*mddev_find(dev_t unit
)
527 struct mddev
*mddev
, *new = NULL
;
529 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
530 unit
&= ~((1<<MdpMinorShift
)-1);
533 spin_lock(&all_mddevs_lock
);
536 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
537 if (mddev
->unit
== unit
) {
539 spin_unlock(&all_mddevs_lock
);
545 list_add(&new->all_mddevs
, &all_mddevs
);
546 spin_unlock(&all_mddevs_lock
);
547 new->hold_active
= UNTIL_IOCTL
;
551 /* find an unused unit number */
552 static int next_minor
= 512;
553 int start
= next_minor
;
557 dev
= MKDEV(MD_MAJOR
, next_minor
);
559 if (next_minor
> MINORMASK
)
561 if (next_minor
== start
) {
562 /* Oh dear, all in use. */
563 spin_unlock(&all_mddevs_lock
);
569 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
570 if (mddev
->unit
== dev
) {
576 new->md_minor
= MINOR(dev
);
577 new->hold_active
= UNTIL_STOP
;
578 list_add(&new->all_mddevs
, &all_mddevs
);
579 spin_unlock(&all_mddevs_lock
);
582 spin_unlock(&all_mddevs_lock
);
584 new = kzalloc(sizeof(*new), GFP_KERNEL
);
589 if (MAJOR(unit
) == MD_MAJOR
)
590 new->md_minor
= MINOR(unit
);
592 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
599 static struct attribute_group md_redundancy_group
;
601 void mddev_unlock(struct mddev
*mddev
)
603 if (mddev
->to_remove
) {
604 /* These cannot be removed under reconfig_mutex as
605 * an access to the files will try to take reconfig_mutex
606 * while holding the file unremovable, which leads to
608 * So hold set sysfs_active while the remove in happeing,
609 * and anything else which might set ->to_remove or my
610 * otherwise change the sysfs namespace will fail with
611 * -EBUSY if sysfs_active is still set.
612 * We set sysfs_active under reconfig_mutex and elsewhere
613 * test it under the same mutex to ensure its correct value
616 struct attribute_group
*to_remove
= mddev
->to_remove
;
617 mddev
->to_remove
= NULL
;
618 mddev
->sysfs_active
= 1;
619 mutex_unlock(&mddev
->reconfig_mutex
);
621 if (mddev
->kobj
.sd
) {
622 if (to_remove
!= &md_redundancy_group
)
623 sysfs_remove_group(&mddev
->kobj
, to_remove
);
624 if (mddev
->pers
== NULL
||
625 mddev
->pers
->sync_request
== NULL
) {
626 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
627 if (mddev
->sysfs_action
)
628 sysfs_put(mddev
->sysfs_action
);
629 mddev
->sysfs_action
= NULL
;
632 mddev
->sysfs_active
= 0;
634 mutex_unlock(&mddev
->reconfig_mutex
);
636 /* As we've dropped the mutex we need a spinlock to
637 * make sure the thread doesn't disappear
639 spin_lock(&pers_lock
);
640 md_wakeup_thread(mddev
->thread
);
641 spin_unlock(&pers_lock
);
643 EXPORT_SYMBOL_GPL(mddev_unlock
);
645 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
647 struct md_rdev
*rdev
;
649 rdev_for_each_rcu(rdev
, mddev
)
650 if (rdev
->desc_nr
== nr
)
655 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
657 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
659 struct md_rdev
*rdev
;
661 rdev_for_each(rdev
, mddev
)
662 if (rdev
->bdev
->bd_dev
== dev
)
668 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
670 struct md_rdev
*rdev
;
672 rdev_for_each_rcu(rdev
, mddev
)
673 if (rdev
->bdev
->bd_dev
== dev
)
679 static struct md_personality
*find_pers(int level
, char *clevel
)
681 struct md_personality
*pers
;
682 list_for_each_entry(pers
, &pers_list
, list
) {
683 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
685 if (strcmp(pers
->name
, clevel
)==0)
691 /* return the offset of the super block in 512byte sectors */
692 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
694 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
695 return MD_NEW_SIZE_SECTORS(num_sectors
);
698 static int alloc_disk_sb(struct md_rdev
*rdev
)
700 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
701 if (!rdev
->sb_page
) {
702 printk(KERN_ALERT
"md: out of memory.\n");
709 void md_rdev_clear(struct md_rdev
*rdev
)
712 put_page(rdev
->sb_page
);
714 rdev
->sb_page
= NULL
;
719 put_page(rdev
->bb_page
);
720 rdev
->bb_page
= NULL
;
722 kfree(rdev
->badblocks
.page
);
723 rdev
->badblocks
.page
= NULL
;
725 EXPORT_SYMBOL_GPL(md_rdev_clear
);
727 static void super_written(struct bio
*bio
, int error
)
729 struct md_rdev
*rdev
= bio
->bi_private
;
730 struct mddev
*mddev
= rdev
->mddev
;
732 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
733 printk("md: super_written gets error=%d, uptodate=%d\n",
734 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
735 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
736 md_error(mddev
, rdev
);
739 if (atomic_dec_and_test(&mddev
->pending_writes
))
740 wake_up(&mddev
->sb_wait
);
744 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
745 sector_t sector
, int size
, struct page
*page
)
747 /* write first size bytes of page to sector of rdev
748 * Increment mddev->pending_writes before returning
749 * and decrement it on completion, waking up sb_wait
750 * if zero is reached.
751 * If an error occurred, call md_error
753 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
755 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
756 bio
->bi_iter
.bi_sector
= sector
;
757 bio_add_page(bio
, page
, size
, 0);
758 bio
->bi_private
= rdev
;
759 bio
->bi_end_io
= super_written
;
761 atomic_inc(&mddev
->pending_writes
);
762 submit_bio(WRITE_FLUSH_FUA
, bio
);
765 void md_super_wait(struct mddev
*mddev
)
767 /* wait for all superblock writes that were scheduled to complete */
768 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
771 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
772 struct page
*page
, int rw
, bool metadata_op
)
774 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
777 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
778 rdev
->meta_bdev
: rdev
->bdev
;
780 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
781 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
782 (rdev
->mddev
->reshape_backwards
==
783 (sector
>= rdev
->mddev
->reshape_position
)))
784 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
786 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
787 bio_add_page(bio
, page
, size
, 0);
788 submit_bio_wait(rw
, bio
);
790 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
794 EXPORT_SYMBOL_GPL(sync_page_io
);
796 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
798 char b
[BDEVNAME_SIZE
];
803 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
809 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
810 bdevname(rdev
->bdev
,b
));
814 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
816 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
817 sb1
->set_uuid1
== sb2
->set_uuid1
&&
818 sb1
->set_uuid2
== sb2
->set_uuid2
&&
819 sb1
->set_uuid3
== sb2
->set_uuid3
;
822 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
825 mdp_super_t
*tmp1
, *tmp2
;
827 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
828 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
830 if (!tmp1
|| !tmp2
) {
832 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
840 * nr_disks is not constant
845 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
852 static u32
md_csum_fold(u32 csum
)
854 csum
= (csum
& 0xffff) + (csum
>> 16);
855 return (csum
& 0xffff) + (csum
>> 16);
858 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
861 u32
*sb32
= (u32
*)sb
;
863 unsigned int disk_csum
, csum
;
865 disk_csum
= sb
->sb_csum
;
868 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
870 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
873 /* This used to use csum_partial, which was wrong for several
874 * reasons including that different results are returned on
875 * different architectures. It isn't critical that we get exactly
876 * the same return value as before (we always csum_fold before
877 * testing, and that removes any differences). However as we
878 * know that csum_partial always returned a 16bit value on
879 * alphas, do a fold to maximise conformity to previous behaviour.
881 sb
->sb_csum
= md_csum_fold(disk_csum
);
883 sb
->sb_csum
= disk_csum
;
889 * Handle superblock details.
890 * We want to be able to handle multiple superblock formats
891 * so we have a common interface to them all, and an array of
892 * different handlers.
893 * We rely on user-space to write the initial superblock, and support
894 * reading and updating of superblocks.
895 * Interface methods are:
896 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
897 * loads and validates a superblock on dev.
898 * if refdev != NULL, compare superblocks on both devices
900 * 0 - dev has a superblock that is compatible with refdev
901 * 1 - dev has a superblock that is compatible and newer than refdev
902 * so dev should be used as the refdev in future
903 * -EINVAL superblock incompatible or invalid
904 * -othererror e.g. -EIO
906 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
907 * Verify that dev is acceptable into mddev.
908 * The first time, mddev->raid_disks will be 0, and data from
909 * dev should be merged in. Subsequent calls check that dev
910 * is new enough. Return 0 or -EINVAL
912 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
913 * Update the superblock for rdev with data in mddev
914 * This does not write to disc.
920 struct module
*owner
;
921 int (*load_super
)(struct md_rdev
*rdev
,
922 struct md_rdev
*refdev
,
924 int (*validate_super
)(struct mddev
*mddev
,
925 struct md_rdev
*rdev
);
926 void (*sync_super
)(struct mddev
*mddev
,
927 struct md_rdev
*rdev
);
928 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
929 sector_t num_sectors
);
930 int (*allow_new_offset
)(struct md_rdev
*rdev
,
931 unsigned long long new_offset
);
935 * Check that the given mddev has no bitmap.
937 * This function is called from the run method of all personalities that do not
938 * support bitmaps. It prints an error message and returns non-zero if mddev
939 * has a bitmap. Otherwise, it returns 0.
942 int md_check_no_bitmap(struct mddev
*mddev
)
944 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
946 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
947 mdname(mddev
), mddev
->pers
->name
);
950 EXPORT_SYMBOL(md_check_no_bitmap
);
953 * load_super for 0.90.0
955 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
957 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
962 * Calculate the position of the superblock (512byte sectors),
963 * it's at the end of the disk.
965 * It also happens to be a multiple of 4Kb.
967 rdev
->sb_start
= calc_dev_sboffset(rdev
);
969 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
974 bdevname(rdev
->bdev
, b
);
975 sb
= page_address(rdev
->sb_page
);
977 if (sb
->md_magic
!= MD_SB_MAGIC
) {
978 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
983 if (sb
->major_version
!= 0 ||
984 sb
->minor_version
< 90 ||
985 sb
->minor_version
> 91) {
986 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
987 sb
->major_version
, sb
->minor_version
,
992 if (sb
->raid_disks
<= 0)
995 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
996 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1001 rdev
->preferred_minor
= sb
->md_minor
;
1002 rdev
->data_offset
= 0;
1003 rdev
->new_data_offset
= 0;
1004 rdev
->sb_size
= MD_SB_BYTES
;
1005 rdev
->badblocks
.shift
= -1;
1007 if (sb
->level
== LEVEL_MULTIPATH
)
1010 rdev
->desc_nr
= sb
->this_disk
.number
;
1016 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1017 if (!uuid_equal(refsb
, sb
)) {
1018 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1019 b
, bdevname(refdev
->bdev
,b2
));
1022 if (!sb_equal(refsb
, sb
)) {
1023 printk(KERN_WARNING
"md: %s has same UUID"
1024 " but different superblock to %s\n",
1025 b
, bdevname(refdev
->bdev
, b2
));
1029 ev2
= md_event(refsb
);
1035 rdev
->sectors
= rdev
->sb_start
;
1036 /* Limit to 4TB as metadata cannot record more than that.
1037 * (not needed for Linear and RAID0 as metadata doesn't
1040 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1041 rdev
->sectors
= (2ULL << 32) - 2;
1043 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1044 /* "this cannot possibly happen" ... */
1052 * validate_super for 0.90.0
1054 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1057 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1058 __u64 ev1
= md_event(sb
);
1060 rdev
->raid_disk
= -1;
1061 clear_bit(Faulty
, &rdev
->flags
);
1062 clear_bit(In_sync
, &rdev
->flags
);
1063 clear_bit(Bitmap_sync
, &rdev
->flags
);
1064 clear_bit(WriteMostly
, &rdev
->flags
);
1066 if (mddev
->raid_disks
== 0) {
1067 mddev
->major_version
= 0;
1068 mddev
->minor_version
= sb
->minor_version
;
1069 mddev
->patch_version
= sb
->patch_version
;
1070 mddev
->external
= 0;
1071 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1072 mddev
->ctime
= sb
->ctime
;
1073 mddev
->utime
= sb
->utime
;
1074 mddev
->level
= sb
->level
;
1075 mddev
->clevel
[0] = 0;
1076 mddev
->layout
= sb
->layout
;
1077 mddev
->raid_disks
= sb
->raid_disks
;
1078 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1079 mddev
->events
= ev1
;
1080 mddev
->bitmap_info
.offset
= 0;
1081 mddev
->bitmap_info
.space
= 0;
1082 /* bitmap can use 60 K after the 4K superblocks */
1083 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1084 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1085 mddev
->reshape_backwards
= 0;
1087 if (mddev
->minor_version
>= 91) {
1088 mddev
->reshape_position
= sb
->reshape_position
;
1089 mddev
->delta_disks
= sb
->delta_disks
;
1090 mddev
->new_level
= sb
->new_level
;
1091 mddev
->new_layout
= sb
->new_layout
;
1092 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1093 if (mddev
->delta_disks
< 0)
1094 mddev
->reshape_backwards
= 1;
1096 mddev
->reshape_position
= MaxSector
;
1097 mddev
->delta_disks
= 0;
1098 mddev
->new_level
= mddev
->level
;
1099 mddev
->new_layout
= mddev
->layout
;
1100 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1103 if (sb
->state
& (1<<MD_SB_CLEAN
))
1104 mddev
->recovery_cp
= MaxSector
;
1106 if (sb
->events_hi
== sb
->cp_events_hi
&&
1107 sb
->events_lo
== sb
->cp_events_lo
) {
1108 mddev
->recovery_cp
= sb
->recovery_cp
;
1110 mddev
->recovery_cp
= 0;
1113 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1114 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1115 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1116 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1118 mddev
->max_disks
= MD_SB_DISKS
;
1120 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1121 mddev
->bitmap_info
.file
== NULL
) {
1122 mddev
->bitmap_info
.offset
=
1123 mddev
->bitmap_info
.default_offset
;
1124 mddev
->bitmap_info
.space
=
1125 mddev
->bitmap_info
.default_space
;
1128 } else if (mddev
->pers
== NULL
) {
1129 /* Insist on good event counter while assembling, except
1130 * for spares (which don't need an event count) */
1132 if (sb
->disks
[rdev
->desc_nr
].state
& (
1133 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1134 if (ev1
< mddev
->events
)
1136 } else if (mddev
->bitmap
) {
1137 /* if adding to array with a bitmap, then we can accept an
1138 * older device ... but not too old.
1140 if (ev1
< mddev
->bitmap
->events_cleared
)
1142 if (ev1
< mddev
->events
)
1143 set_bit(Bitmap_sync
, &rdev
->flags
);
1145 if (ev1
< mddev
->events
)
1146 /* just a hot-add of a new device, leave raid_disk at -1 */
1150 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1151 desc
= sb
->disks
+ rdev
->desc_nr
;
1153 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1154 set_bit(Faulty
, &rdev
->flags
);
1155 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1156 desc->raid_disk < mddev->raid_disks */) {
1157 set_bit(In_sync
, &rdev
->flags
);
1158 rdev
->raid_disk
= desc
->raid_disk
;
1159 rdev
->saved_raid_disk
= desc
->raid_disk
;
1160 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1161 /* active but not in sync implies recovery up to
1162 * reshape position. We don't know exactly where
1163 * that is, so set to zero for now */
1164 if (mddev
->minor_version
>= 91) {
1165 rdev
->recovery_offset
= 0;
1166 rdev
->raid_disk
= desc
->raid_disk
;
1169 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1170 set_bit(WriteMostly
, &rdev
->flags
);
1171 } else /* MULTIPATH are always insync */
1172 set_bit(In_sync
, &rdev
->flags
);
1177 * sync_super for 0.90.0
1179 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1182 struct md_rdev
*rdev2
;
1183 int next_spare
= mddev
->raid_disks
;
1185 /* make rdev->sb match mddev data..
1188 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1189 * 3/ any empty disks < next_spare become removed
1191 * disks[0] gets initialised to REMOVED because
1192 * we cannot be sure from other fields if it has
1193 * been initialised or not.
1196 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1198 rdev
->sb_size
= MD_SB_BYTES
;
1200 sb
= page_address(rdev
->sb_page
);
1202 memset(sb
, 0, sizeof(*sb
));
1204 sb
->md_magic
= MD_SB_MAGIC
;
1205 sb
->major_version
= mddev
->major_version
;
1206 sb
->patch_version
= mddev
->patch_version
;
1207 sb
->gvalid_words
= 0; /* ignored */
1208 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1209 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1210 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1211 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1213 sb
->ctime
= mddev
->ctime
;
1214 sb
->level
= mddev
->level
;
1215 sb
->size
= mddev
->dev_sectors
/ 2;
1216 sb
->raid_disks
= mddev
->raid_disks
;
1217 sb
->md_minor
= mddev
->md_minor
;
1218 sb
->not_persistent
= 0;
1219 sb
->utime
= mddev
->utime
;
1221 sb
->events_hi
= (mddev
->events
>>32);
1222 sb
->events_lo
= (u32
)mddev
->events
;
1224 if (mddev
->reshape_position
== MaxSector
)
1225 sb
->minor_version
= 90;
1227 sb
->minor_version
= 91;
1228 sb
->reshape_position
= mddev
->reshape_position
;
1229 sb
->new_level
= mddev
->new_level
;
1230 sb
->delta_disks
= mddev
->delta_disks
;
1231 sb
->new_layout
= mddev
->new_layout
;
1232 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1234 mddev
->minor_version
= sb
->minor_version
;
1237 sb
->recovery_cp
= mddev
->recovery_cp
;
1238 sb
->cp_events_hi
= (mddev
->events
>>32);
1239 sb
->cp_events_lo
= (u32
)mddev
->events
;
1240 if (mddev
->recovery_cp
== MaxSector
)
1241 sb
->state
= (1<< MD_SB_CLEAN
);
1243 sb
->recovery_cp
= 0;
1245 sb
->layout
= mddev
->layout
;
1246 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1248 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1249 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1251 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1252 rdev_for_each(rdev2
, mddev
) {
1255 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1257 if (rdev2
->raid_disk
>= 0 &&
1258 sb
->minor_version
>= 91)
1259 /* we have nowhere to store the recovery_offset,
1260 * but if it is not below the reshape_position,
1261 * we can piggy-back on that.
1264 if (rdev2
->raid_disk
< 0 ||
1265 test_bit(Faulty
, &rdev2
->flags
))
1268 desc_nr
= rdev2
->raid_disk
;
1270 desc_nr
= next_spare
++;
1271 rdev2
->desc_nr
= desc_nr
;
1272 d
= &sb
->disks
[rdev2
->desc_nr
];
1274 d
->number
= rdev2
->desc_nr
;
1275 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1276 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1278 d
->raid_disk
= rdev2
->raid_disk
;
1280 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1281 if (test_bit(Faulty
, &rdev2
->flags
))
1282 d
->state
= (1<<MD_DISK_FAULTY
);
1283 else if (is_active
) {
1284 d
->state
= (1<<MD_DISK_ACTIVE
);
1285 if (test_bit(In_sync
, &rdev2
->flags
))
1286 d
->state
|= (1<<MD_DISK_SYNC
);
1294 if (test_bit(WriteMostly
, &rdev2
->flags
))
1295 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1297 /* now set the "removed" and "faulty" bits on any missing devices */
1298 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1299 mdp_disk_t
*d
= &sb
->disks
[i
];
1300 if (d
->state
== 0 && d
->number
== 0) {
1303 d
->state
= (1<<MD_DISK_REMOVED
);
1304 d
->state
|= (1<<MD_DISK_FAULTY
);
1308 sb
->nr_disks
= nr_disks
;
1309 sb
->active_disks
= active
;
1310 sb
->working_disks
= working
;
1311 sb
->failed_disks
= failed
;
1312 sb
->spare_disks
= spare
;
1314 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1315 sb
->sb_csum
= calc_sb_csum(sb
);
1319 * rdev_size_change for 0.90.0
1321 static unsigned long long
1322 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1324 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1325 return 0; /* component must fit device */
1326 if (rdev
->mddev
->bitmap_info
.offset
)
1327 return 0; /* can't move bitmap */
1328 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1329 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1330 num_sectors
= rdev
->sb_start
;
1331 /* Limit to 4TB as metadata cannot record more than that.
1332 * 4TB == 2^32 KB, or 2*2^32 sectors.
1334 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1335 num_sectors
= (2ULL << 32) - 2;
1336 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1338 md_super_wait(rdev
->mddev
);
1343 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1345 /* non-zero offset changes not possible with v0.90 */
1346 return new_offset
== 0;
1350 * version 1 superblock
1353 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1357 unsigned long long newcsum
;
1358 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1359 __le32
*isuper
= (__le32
*)sb
;
1361 disk_csum
= sb
->sb_csum
;
1364 for (; size
>= 4; size
-= 4)
1365 newcsum
+= le32_to_cpu(*isuper
++);
1368 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1370 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1371 sb
->sb_csum
= disk_csum
;
1372 return cpu_to_le32(csum
);
1375 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1377 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1379 struct mdp_superblock_1
*sb
;
1383 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1387 * Calculate the position of the superblock in 512byte sectors.
1388 * It is always aligned to a 4K boundary and
1389 * depeding on minor_version, it can be:
1390 * 0: At least 8K, but less than 12K, from end of device
1391 * 1: At start of device
1392 * 2: 4K from start of device.
1394 switch(minor_version
) {
1396 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1398 sb_start
&= ~(sector_t
)(4*2-1);
1409 rdev
->sb_start
= sb_start
;
1411 /* superblock is rarely larger than 1K, but it can be larger,
1412 * and it is safe to read 4k, so we do that
1414 ret
= read_disk_sb(rdev
, 4096);
1415 if (ret
) return ret
;
1417 sb
= page_address(rdev
->sb_page
);
1419 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1420 sb
->major_version
!= cpu_to_le32(1) ||
1421 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1422 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1423 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1426 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1427 printk("md: invalid superblock checksum on %s\n",
1428 bdevname(rdev
->bdev
,b
));
1431 if (le64_to_cpu(sb
->data_size
) < 10) {
1432 printk("md: data_size too small on %s\n",
1433 bdevname(rdev
->bdev
,b
));
1438 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1439 /* Some padding is non-zero, might be a new feature */
1442 rdev
->preferred_minor
= 0xffff;
1443 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1444 rdev
->new_data_offset
= rdev
->data_offset
;
1445 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1446 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1447 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1448 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1450 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1451 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1452 if (rdev
->sb_size
& bmask
)
1453 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1456 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1459 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1462 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1465 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1467 if (!rdev
->bb_page
) {
1468 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1472 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1473 rdev
->badblocks
.count
== 0) {
1474 /* need to load the bad block list.
1475 * Currently we limit it to one page.
1481 int sectors
= le16_to_cpu(sb
->bblog_size
);
1482 if (sectors
> (PAGE_SIZE
/ 512))
1484 offset
= le32_to_cpu(sb
->bblog_offset
);
1487 bb_sector
= (long long)offset
;
1488 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1489 rdev
->bb_page
, READ
, true))
1491 bbp
= (u64
*)page_address(rdev
->bb_page
);
1492 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1493 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1494 u64 bb
= le64_to_cpu(*bbp
);
1495 int count
= bb
& (0x3ff);
1496 u64 sector
= bb
>> 10;
1497 sector
<<= sb
->bblog_shift
;
1498 count
<<= sb
->bblog_shift
;
1501 if (md_set_badblocks(&rdev
->badblocks
,
1502 sector
, count
, 1) == 0)
1505 } else if (sb
->bblog_offset
!= 0)
1506 rdev
->badblocks
.shift
= 0;
1512 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1514 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1515 sb
->level
!= refsb
->level
||
1516 sb
->layout
!= refsb
->layout
||
1517 sb
->chunksize
!= refsb
->chunksize
) {
1518 printk(KERN_WARNING
"md: %s has strangely different"
1519 " superblock to %s\n",
1520 bdevname(rdev
->bdev
,b
),
1521 bdevname(refdev
->bdev
,b2
));
1524 ev1
= le64_to_cpu(sb
->events
);
1525 ev2
= le64_to_cpu(refsb
->events
);
1532 if (minor_version
) {
1533 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1534 sectors
-= rdev
->data_offset
;
1536 sectors
= rdev
->sb_start
;
1537 if (sectors
< le64_to_cpu(sb
->data_size
))
1539 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1543 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1545 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1546 __u64 ev1
= le64_to_cpu(sb
->events
);
1548 rdev
->raid_disk
= -1;
1549 clear_bit(Faulty
, &rdev
->flags
);
1550 clear_bit(In_sync
, &rdev
->flags
);
1551 clear_bit(Bitmap_sync
, &rdev
->flags
);
1552 clear_bit(WriteMostly
, &rdev
->flags
);
1554 if (mddev
->raid_disks
== 0) {
1555 mddev
->major_version
= 1;
1556 mddev
->patch_version
= 0;
1557 mddev
->external
= 0;
1558 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1559 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1560 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1561 mddev
->level
= le32_to_cpu(sb
->level
);
1562 mddev
->clevel
[0] = 0;
1563 mddev
->layout
= le32_to_cpu(sb
->layout
);
1564 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1565 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1566 mddev
->events
= ev1
;
1567 mddev
->bitmap_info
.offset
= 0;
1568 mddev
->bitmap_info
.space
= 0;
1569 /* Default location for bitmap is 1K after superblock
1570 * using 3K - total of 4K
1572 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1573 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1574 mddev
->reshape_backwards
= 0;
1576 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1577 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1579 mddev
->max_disks
= (4096-256)/2;
1581 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1582 mddev
->bitmap_info
.file
== NULL
) {
1583 mddev
->bitmap_info
.offset
=
1584 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1585 /* Metadata doesn't record how much space is available.
1586 * For 1.0, we assume we can use up to the superblock
1587 * if before, else to 4K beyond superblock.
1588 * For others, assume no change is possible.
1590 if (mddev
->minor_version
> 0)
1591 mddev
->bitmap_info
.space
= 0;
1592 else if (mddev
->bitmap_info
.offset
> 0)
1593 mddev
->bitmap_info
.space
=
1594 8 - mddev
->bitmap_info
.offset
;
1596 mddev
->bitmap_info
.space
=
1597 -mddev
->bitmap_info
.offset
;
1600 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1601 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1602 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1603 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1604 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1605 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1606 if (mddev
->delta_disks
< 0 ||
1607 (mddev
->delta_disks
== 0 &&
1608 (le32_to_cpu(sb
->feature_map
)
1609 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1610 mddev
->reshape_backwards
= 1;
1612 mddev
->reshape_position
= MaxSector
;
1613 mddev
->delta_disks
= 0;
1614 mddev
->new_level
= mddev
->level
;
1615 mddev
->new_layout
= mddev
->layout
;
1616 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1619 } else if (mddev
->pers
== NULL
) {
1620 /* Insist of good event counter while assembling, except for
1621 * spares (which don't need an event count) */
1623 if (rdev
->desc_nr
>= 0 &&
1624 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1625 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1626 if (ev1
< mddev
->events
)
1628 } else if (mddev
->bitmap
) {
1629 /* If adding to array with a bitmap, then we can accept an
1630 * older device, but not too old.
1632 if (ev1
< mddev
->bitmap
->events_cleared
)
1634 if (ev1
< mddev
->events
)
1635 set_bit(Bitmap_sync
, &rdev
->flags
);
1637 if (ev1
< mddev
->events
)
1638 /* just a hot-add of a new device, leave raid_disk at -1 */
1641 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1643 if (rdev
->desc_nr
< 0 ||
1644 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1648 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1650 case 0xffff: /* spare */
1652 case 0xfffe: /* faulty */
1653 set_bit(Faulty
, &rdev
->flags
);
1656 rdev
->saved_raid_disk
= role
;
1657 if ((le32_to_cpu(sb
->feature_map
) &
1658 MD_FEATURE_RECOVERY_OFFSET
)) {
1659 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1660 if (!(le32_to_cpu(sb
->feature_map
) &
1661 MD_FEATURE_RECOVERY_BITMAP
))
1662 rdev
->saved_raid_disk
= -1;
1664 set_bit(In_sync
, &rdev
->flags
);
1665 rdev
->raid_disk
= role
;
1668 if (sb
->devflags
& WriteMostly1
)
1669 set_bit(WriteMostly
, &rdev
->flags
);
1670 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1671 set_bit(Replacement
, &rdev
->flags
);
1672 } else /* MULTIPATH are always insync */
1673 set_bit(In_sync
, &rdev
->flags
);
1678 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1680 struct mdp_superblock_1
*sb
;
1681 struct md_rdev
*rdev2
;
1683 /* make rdev->sb match mddev and rdev data. */
1685 sb
= page_address(rdev
->sb_page
);
1687 sb
->feature_map
= 0;
1689 sb
->recovery_offset
= cpu_to_le64(0);
1690 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1692 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1693 sb
->events
= cpu_to_le64(mddev
->events
);
1695 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1697 sb
->resync_offset
= cpu_to_le64(0);
1699 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1701 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1702 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1703 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1704 sb
->level
= cpu_to_le32(mddev
->level
);
1705 sb
->layout
= cpu_to_le32(mddev
->layout
);
1707 if (test_bit(WriteMostly
, &rdev
->flags
))
1708 sb
->devflags
|= WriteMostly1
;
1710 sb
->devflags
&= ~WriteMostly1
;
1711 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1712 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1714 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1715 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1716 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1719 if (rdev
->raid_disk
>= 0 &&
1720 !test_bit(In_sync
, &rdev
->flags
)) {
1722 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1723 sb
->recovery_offset
=
1724 cpu_to_le64(rdev
->recovery_offset
);
1725 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1727 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1729 if (test_bit(Replacement
, &rdev
->flags
))
1731 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1733 if (mddev
->reshape_position
!= MaxSector
) {
1734 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1735 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1736 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1737 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1738 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1739 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1740 if (mddev
->delta_disks
== 0 &&
1741 mddev
->reshape_backwards
)
1743 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1744 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1746 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1747 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1748 - rdev
->data_offset
));
1752 if (rdev
->badblocks
.count
== 0)
1753 /* Nothing to do for bad blocks*/ ;
1754 else if (sb
->bblog_offset
== 0)
1755 /* Cannot record bad blocks on this device */
1756 md_error(mddev
, rdev
);
1758 struct badblocks
*bb
= &rdev
->badblocks
;
1759 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1761 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1766 seq
= read_seqbegin(&bb
->lock
);
1768 memset(bbp
, 0xff, PAGE_SIZE
);
1770 for (i
= 0 ; i
< bb
->count
; i
++) {
1771 u64 internal_bb
= p
[i
];
1772 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1773 | BB_LEN(internal_bb
));
1774 bbp
[i
] = cpu_to_le64(store_bb
);
1777 if (read_seqretry(&bb
->lock
, seq
))
1780 bb
->sector
= (rdev
->sb_start
+
1781 (int)le32_to_cpu(sb
->bblog_offset
));
1782 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1787 rdev_for_each(rdev2
, mddev
)
1788 if (rdev2
->desc_nr
+1 > max_dev
)
1789 max_dev
= rdev2
->desc_nr
+1;
1791 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1793 sb
->max_dev
= cpu_to_le32(max_dev
);
1794 rdev
->sb_size
= max_dev
* 2 + 256;
1795 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1796 if (rdev
->sb_size
& bmask
)
1797 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1799 max_dev
= le32_to_cpu(sb
->max_dev
);
1801 for (i
=0; i
<max_dev
;i
++)
1802 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1804 rdev_for_each(rdev2
, mddev
) {
1806 if (test_bit(Faulty
, &rdev2
->flags
))
1807 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1808 else if (test_bit(In_sync
, &rdev2
->flags
))
1809 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1810 else if (rdev2
->raid_disk
>= 0)
1811 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1813 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1816 sb
->sb_csum
= calc_sb_1_csum(sb
);
1819 static unsigned long long
1820 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1822 struct mdp_superblock_1
*sb
;
1823 sector_t max_sectors
;
1824 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1825 return 0; /* component must fit device */
1826 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1827 return 0; /* too confusing */
1828 if (rdev
->sb_start
< rdev
->data_offset
) {
1829 /* minor versions 1 and 2; superblock before data */
1830 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1831 max_sectors
-= rdev
->data_offset
;
1832 if (!num_sectors
|| num_sectors
> max_sectors
)
1833 num_sectors
= max_sectors
;
1834 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1835 /* minor version 0 with bitmap we can't move */
1838 /* minor version 0; superblock after data */
1840 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1841 sb_start
&= ~(sector_t
)(4*2 - 1);
1842 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1843 if (!num_sectors
|| num_sectors
> max_sectors
)
1844 num_sectors
= max_sectors
;
1845 rdev
->sb_start
= sb_start
;
1847 sb
= page_address(rdev
->sb_page
);
1848 sb
->data_size
= cpu_to_le64(num_sectors
);
1849 sb
->super_offset
= rdev
->sb_start
;
1850 sb
->sb_csum
= calc_sb_1_csum(sb
);
1851 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1853 md_super_wait(rdev
->mddev
);
1859 super_1_allow_new_offset(struct md_rdev
*rdev
,
1860 unsigned long long new_offset
)
1862 /* All necessary checks on new >= old have been done */
1863 struct bitmap
*bitmap
;
1864 if (new_offset
>= rdev
->data_offset
)
1867 /* with 1.0 metadata, there is no metadata to tread on
1868 * so we can always move back */
1869 if (rdev
->mddev
->minor_version
== 0)
1872 /* otherwise we must be sure not to step on
1873 * any metadata, so stay:
1874 * 36K beyond start of superblock
1875 * beyond end of badblocks
1876 * beyond write-intent bitmap
1878 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1880 bitmap
= rdev
->mddev
->bitmap
;
1881 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1882 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1883 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1885 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1891 static struct super_type super_types
[] = {
1894 .owner
= THIS_MODULE
,
1895 .load_super
= super_90_load
,
1896 .validate_super
= super_90_validate
,
1897 .sync_super
= super_90_sync
,
1898 .rdev_size_change
= super_90_rdev_size_change
,
1899 .allow_new_offset
= super_90_allow_new_offset
,
1903 .owner
= THIS_MODULE
,
1904 .load_super
= super_1_load
,
1905 .validate_super
= super_1_validate
,
1906 .sync_super
= super_1_sync
,
1907 .rdev_size_change
= super_1_rdev_size_change
,
1908 .allow_new_offset
= super_1_allow_new_offset
,
1912 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1914 if (mddev
->sync_super
) {
1915 mddev
->sync_super(mddev
, rdev
);
1919 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1921 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1924 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1926 struct md_rdev
*rdev
, *rdev2
;
1929 rdev_for_each_rcu(rdev
, mddev1
)
1930 rdev_for_each_rcu(rdev2
, mddev2
)
1931 if (rdev
->bdev
->bd_contains
==
1932 rdev2
->bdev
->bd_contains
) {
1940 static LIST_HEAD(pending_raid_disks
);
1943 * Try to register data integrity profile for an mddev
1945 * This is called when an array is started and after a disk has been kicked
1946 * from the array. It only succeeds if all working and active component devices
1947 * are integrity capable with matching profiles.
1949 int md_integrity_register(struct mddev
*mddev
)
1951 struct md_rdev
*rdev
, *reference
= NULL
;
1953 if (list_empty(&mddev
->disks
))
1954 return 0; /* nothing to do */
1955 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1956 return 0; /* shouldn't register, or already is */
1957 rdev_for_each(rdev
, mddev
) {
1958 /* skip spares and non-functional disks */
1959 if (test_bit(Faulty
, &rdev
->flags
))
1961 if (rdev
->raid_disk
< 0)
1964 /* Use the first rdev as the reference */
1968 /* does this rdev's profile match the reference profile? */
1969 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1970 rdev
->bdev
->bd_disk
) < 0)
1973 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1976 * All component devices are integrity capable and have matching
1977 * profiles, register the common profile for the md device.
1979 if (blk_integrity_register(mddev
->gendisk
,
1980 bdev_get_integrity(reference
->bdev
)) != 0) {
1981 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1985 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1986 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1987 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1993 EXPORT_SYMBOL(md_integrity_register
);
1995 /* Disable data integrity if non-capable/non-matching disk is being added */
1996 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1998 struct blk_integrity
*bi_rdev
;
1999 struct blk_integrity
*bi_mddev
;
2001 if (!mddev
->gendisk
)
2004 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2005 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2007 if (!bi_mddev
) /* nothing to do */
2009 if (rdev
->raid_disk
< 0) /* skip spares */
2011 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2012 rdev
->bdev
->bd_disk
) >= 0)
2014 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2015 blk_integrity_unregister(mddev
->gendisk
);
2017 EXPORT_SYMBOL(md_integrity_add_rdev
);
2019 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2021 char b
[BDEVNAME_SIZE
];
2026 /* prevent duplicates */
2027 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2030 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2031 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2032 rdev
->sectors
< mddev
->dev_sectors
)) {
2034 /* Cannot change size, so fail
2035 * If mddev->level <= 0, then we don't care
2036 * about aligning sizes (e.g. linear)
2038 if (mddev
->level
> 0)
2041 mddev
->dev_sectors
= rdev
->sectors
;
2044 /* Verify rdev->desc_nr is unique.
2045 * If it is -1, assign a free number, else
2046 * check number is not in use
2049 if (rdev
->desc_nr
< 0) {
2052 choice
= mddev
->raid_disks
;
2053 while (md_find_rdev_nr_rcu(mddev
, choice
))
2055 rdev
->desc_nr
= choice
;
2057 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2063 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2064 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2065 mdname(mddev
), mddev
->max_disks
);
2068 bdevname(rdev
->bdev
,b
);
2069 while ( (s
=strchr(b
, '/')) != NULL
)
2072 rdev
->mddev
= mddev
;
2073 printk(KERN_INFO
"md: bind<%s>\n", b
);
2075 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2078 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2079 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2080 /* failure here is OK */;
2081 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2083 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2084 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2086 /* May as well allow recovery to be retried once */
2087 mddev
->recovery_disabled
++;
2092 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2097 static void md_delayed_delete(struct work_struct
*ws
)
2099 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2100 kobject_del(&rdev
->kobj
);
2101 kobject_put(&rdev
->kobj
);
2104 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2106 char b
[BDEVNAME_SIZE
];
2108 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2109 list_del_rcu(&rdev
->same_set
);
2110 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2112 sysfs_remove_link(&rdev
->kobj
, "block");
2113 sysfs_put(rdev
->sysfs_state
);
2114 rdev
->sysfs_state
= NULL
;
2115 rdev
->badblocks
.count
= 0;
2116 /* We need to delay this, otherwise we can deadlock when
2117 * writing to 'remove' to "dev/state". We also need
2118 * to delay it due to rcu usage.
2121 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2122 kobject_get(&rdev
->kobj
);
2123 queue_work(md_misc_wq
, &rdev
->del_work
);
2127 * prevent the device from being mounted, repartitioned or
2128 * otherwise reused by a RAID array (or any other kernel
2129 * subsystem), by bd_claiming the device.
2131 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2134 struct block_device
*bdev
;
2135 char b
[BDEVNAME_SIZE
];
2137 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2138 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2140 printk(KERN_ERR
"md: could not open %s.\n",
2141 __bdevname(dev
, b
));
2142 return PTR_ERR(bdev
);
2148 static void unlock_rdev(struct md_rdev
*rdev
)
2150 struct block_device
*bdev
= rdev
->bdev
;
2152 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2155 void md_autodetect_dev(dev_t dev
);
2157 static void export_rdev(struct md_rdev
*rdev
)
2159 char b
[BDEVNAME_SIZE
];
2161 printk(KERN_INFO
"md: export_rdev(%s)\n",
2162 bdevname(rdev
->bdev
,b
));
2163 md_rdev_clear(rdev
);
2165 if (test_bit(AutoDetected
, &rdev
->flags
))
2166 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2169 kobject_put(&rdev
->kobj
);
2172 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2174 unbind_rdev_from_array(rdev
);
2177 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2179 static void export_array(struct mddev
*mddev
)
2181 struct md_rdev
*rdev
;
2183 while (!list_empty(&mddev
->disks
)) {
2184 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2186 md_kick_rdev_from_array(rdev
);
2188 mddev
->raid_disks
= 0;
2189 mddev
->major_version
= 0;
2192 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2194 /* Update each superblock (in-memory image), but
2195 * if we are allowed to, skip spares which already
2196 * have the right event counter, or have one earlier
2197 * (which would mean they aren't being marked as dirty
2198 * with the rest of the array)
2200 struct md_rdev
*rdev
;
2201 rdev_for_each(rdev
, mddev
) {
2202 if (rdev
->sb_events
== mddev
->events
||
2204 rdev
->raid_disk
< 0 &&
2205 rdev
->sb_events
+1 == mddev
->events
)) {
2206 /* Don't update this superblock */
2207 rdev
->sb_loaded
= 2;
2209 sync_super(mddev
, rdev
);
2210 rdev
->sb_loaded
= 1;
2215 void md_update_sb(struct mddev
*mddev
, int force_change
)
2217 struct md_rdev
*rdev
;
2220 int any_badblocks_changed
= 0;
2224 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2228 /* First make sure individual recovery_offsets are correct */
2229 rdev_for_each(rdev
, mddev
) {
2230 if (rdev
->raid_disk
>= 0 &&
2231 mddev
->delta_disks
>= 0 &&
2232 !test_bit(In_sync
, &rdev
->flags
) &&
2233 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2234 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2237 if (!mddev
->persistent
) {
2238 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2239 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2240 if (!mddev
->external
) {
2241 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2242 rdev_for_each(rdev
, mddev
) {
2243 if (rdev
->badblocks
.changed
) {
2244 rdev
->badblocks
.changed
= 0;
2245 md_ack_all_badblocks(&rdev
->badblocks
);
2246 md_error(mddev
, rdev
);
2248 clear_bit(Blocked
, &rdev
->flags
);
2249 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2250 wake_up(&rdev
->blocked_wait
);
2253 wake_up(&mddev
->sb_wait
);
2257 spin_lock(&mddev
->lock
);
2259 mddev
->utime
= get_seconds();
2261 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2263 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2264 /* just a clean<-> dirty transition, possibly leave spares alone,
2265 * though if events isn't the right even/odd, we will have to do
2271 if (mddev
->degraded
)
2272 /* If the array is degraded, then skipping spares is both
2273 * dangerous and fairly pointless.
2274 * Dangerous because a device that was removed from the array
2275 * might have a event_count that still looks up-to-date,
2276 * so it can be re-added without a resync.
2277 * Pointless because if there are any spares to skip,
2278 * then a recovery will happen and soon that array won't
2279 * be degraded any more and the spare can go back to sleep then.
2283 sync_req
= mddev
->in_sync
;
2285 /* If this is just a dirty<->clean transition, and the array is clean
2286 * and 'events' is odd, we can roll back to the previous clean state */
2288 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2289 && mddev
->can_decrease_events
2290 && mddev
->events
!= 1) {
2292 mddev
->can_decrease_events
= 0;
2294 /* otherwise we have to go forward and ... */
2296 mddev
->can_decrease_events
= nospares
;
2300 * This 64-bit counter should never wrap.
2301 * Either we are in around ~1 trillion A.C., assuming
2302 * 1 reboot per second, or we have a bug...
2304 WARN_ON(mddev
->events
== 0);
2306 rdev_for_each(rdev
, mddev
) {
2307 if (rdev
->badblocks
.changed
)
2308 any_badblocks_changed
++;
2309 if (test_bit(Faulty
, &rdev
->flags
))
2310 set_bit(FaultRecorded
, &rdev
->flags
);
2313 sync_sbs(mddev
, nospares
);
2314 spin_unlock(&mddev
->lock
);
2316 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2317 mdname(mddev
), mddev
->in_sync
);
2319 bitmap_update_sb(mddev
->bitmap
);
2320 rdev_for_each(rdev
, mddev
) {
2321 char b
[BDEVNAME_SIZE
];
2323 if (rdev
->sb_loaded
!= 1)
2324 continue; /* no noise on spare devices */
2326 if (!test_bit(Faulty
, &rdev
->flags
)) {
2327 md_super_write(mddev
,rdev
,
2328 rdev
->sb_start
, rdev
->sb_size
,
2330 pr_debug("md: (write) %s's sb offset: %llu\n",
2331 bdevname(rdev
->bdev
, b
),
2332 (unsigned long long)rdev
->sb_start
);
2333 rdev
->sb_events
= mddev
->events
;
2334 if (rdev
->badblocks
.size
) {
2335 md_super_write(mddev
, rdev
,
2336 rdev
->badblocks
.sector
,
2337 rdev
->badblocks
.size
<< 9,
2339 rdev
->badblocks
.size
= 0;
2343 pr_debug("md: %s (skipping faulty)\n",
2344 bdevname(rdev
->bdev
, b
));
2346 if (mddev
->level
== LEVEL_MULTIPATH
)
2347 /* only need to write one superblock... */
2350 md_super_wait(mddev
);
2351 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2353 spin_lock(&mddev
->lock
);
2354 if (mddev
->in_sync
!= sync_req
||
2355 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2356 /* have to write it out again */
2357 spin_unlock(&mddev
->lock
);
2360 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2361 spin_unlock(&mddev
->lock
);
2362 wake_up(&mddev
->sb_wait
);
2363 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2364 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2366 rdev_for_each(rdev
, mddev
) {
2367 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2368 clear_bit(Blocked
, &rdev
->flags
);
2370 if (any_badblocks_changed
)
2371 md_ack_all_badblocks(&rdev
->badblocks
);
2372 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2373 wake_up(&rdev
->blocked_wait
);
2376 EXPORT_SYMBOL(md_update_sb
);
2378 /* words written to sysfs files may, or may not, be \n terminated.
2379 * We want to accept with case. For this we use cmd_match.
2381 static int cmd_match(const char *cmd
, const char *str
)
2383 /* See if cmd, written into a sysfs file, matches
2384 * str. They must either be the same, or cmd can
2385 * have a trailing newline
2387 while (*cmd
&& *str
&& *cmd
== *str
) {
2398 struct rdev_sysfs_entry
{
2399 struct attribute attr
;
2400 ssize_t (*show
)(struct md_rdev
*, char *);
2401 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2405 state_show(struct md_rdev
*rdev
, char *page
)
2409 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2411 if (test_bit(Faulty
, &flags
) ||
2412 rdev
->badblocks
.unacked_exist
) {
2413 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2416 if (test_bit(In_sync
, &flags
)) {
2417 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2420 if (test_bit(WriteMostly
, &flags
)) {
2421 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2424 if (test_bit(Blocked
, &flags
) ||
2425 (rdev
->badblocks
.unacked_exist
2426 && !test_bit(Faulty
, &flags
))) {
2427 len
+= sprintf(page
+len
, "%sblocked", sep
);
2430 if (!test_bit(Faulty
, &flags
) &&
2431 !test_bit(In_sync
, &flags
)) {
2432 len
+= sprintf(page
+len
, "%sspare", sep
);
2435 if (test_bit(WriteErrorSeen
, &flags
)) {
2436 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2439 if (test_bit(WantReplacement
, &flags
)) {
2440 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2443 if (test_bit(Replacement
, &flags
)) {
2444 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2448 return len
+sprintf(page
+len
, "\n");
2452 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2455 * faulty - simulates an error
2456 * remove - disconnects the device
2457 * writemostly - sets write_mostly
2458 * -writemostly - clears write_mostly
2459 * blocked - sets the Blocked flags
2460 * -blocked - clears the Blocked and possibly simulates an error
2461 * insync - sets Insync providing device isn't active
2462 * -insync - clear Insync for a device with a slot assigned,
2463 * so that it gets rebuilt based on bitmap
2464 * write_error - sets WriteErrorSeen
2465 * -write_error - clears WriteErrorSeen
2468 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2469 md_error(rdev
->mddev
, rdev
);
2470 if (test_bit(Faulty
, &rdev
->flags
))
2474 } else if (cmd_match(buf
, "remove")) {
2475 if (rdev
->raid_disk
>= 0)
2478 struct mddev
*mddev
= rdev
->mddev
;
2479 if (mddev_is_clustered(mddev
))
2480 md_cluster_ops
->metadata_update_start(mddev
);
2481 md_kick_rdev_from_array(rdev
);
2483 md_update_sb(mddev
, 1);
2484 md_new_event(mddev
);
2485 if (mddev_is_clustered(mddev
))
2486 md_cluster_ops
->metadata_update_finish(mddev
);
2489 } else if (cmd_match(buf
, "writemostly")) {
2490 set_bit(WriteMostly
, &rdev
->flags
);
2492 } else if (cmd_match(buf
, "-writemostly")) {
2493 clear_bit(WriteMostly
, &rdev
->flags
);
2495 } else if (cmd_match(buf
, "blocked")) {
2496 set_bit(Blocked
, &rdev
->flags
);
2498 } else if (cmd_match(buf
, "-blocked")) {
2499 if (!test_bit(Faulty
, &rdev
->flags
) &&
2500 rdev
->badblocks
.unacked_exist
) {
2501 /* metadata handler doesn't understand badblocks,
2502 * so we need to fail the device
2504 md_error(rdev
->mddev
, rdev
);
2506 clear_bit(Blocked
, &rdev
->flags
);
2507 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2508 wake_up(&rdev
->blocked_wait
);
2509 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2510 md_wakeup_thread(rdev
->mddev
->thread
);
2513 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2514 set_bit(In_sync
, &rdev
->flags
);
2516 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2517 if (rdev
->mddev
->pers
== NULL
) {
2518 clear_bit(In_sync
, &rdev
->flags
);
2519 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2520 rdev
->raid_disk
= -1;
2523 } else if (cmd_match(buf
, "write_error")) {
2524 set_bit(WriteErrorSeen
, &rdev
->flags
);
2526 } else if (cmd_match(buf
, "-write_error")) {
2527 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2529 } else if (cmd_match(buf
, "want_replacement")) {
2530 /* Any non-spare device that is not a replacement can
2531 * become want_replacement at any time, but we then need to
2532 * check if recovery is needed.
2534 if (rdev
->raid_disk
>= 0 &&
2535 !test_bit(Replacement
, &rdev
->flags
))
2536 set_bit(WantReplacement
, &rdev
->flags
);
2537 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2538 md_wakeup_thread(rdev
->mddev
->thread
);
2540 } else if (cmd_match(buf
, "-want_replacement")) {
2541 /* Clearing 'want_replacement' is always allowed.
2542 * Once replacements starts it is too late though.
2545 clear_bit(WantReplacement
, &rdev
->flags
);
2546 } else if (cmd_match(buf
, "replacement")) {
2547 /* Can only set a device as a replacement when array has not
2548 * yet been started. Once running, replacement is automatic
2549 * from spares, or by assigning 'slot'.
2551 if (rdev
->mddev
->pers
)
2554 set_bit(Replacement
, &rdev
->flags
);
2557 } else if (cmd_match(buf
, "-replacement")) {
2558 /* Similarly, can only clear Replacement before start */
2559 if (rdev
->mddev
->pers
)
2562 clear_bit(Replacement
, &rdev
->flags
);
2567 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2568 return err
? err
: len
;
2570 static struct rdev_sysfs_entry rdev_state
=
2571 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2574 errors_show(struct md_rdev
*rdev
, char *page
)
2576 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2580 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2583 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2584 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2585 atomic_set(&rdev
->corrected_errors
, n
);
2590 static struct rdev_sysfs_entry rdev_errors
=
2591 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2594 slot_show(struct md_rdev
*rdev
, char *page
)
2596 if (rdev
->raid_disk
< 0)
2597 return sprintf(page
, "none\n");
2599 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2603 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2607 int slot
= simple_strtoul(buf
, &e
, 10);
2608 if (strncmp(buf
, "none", 4)==0)
2610 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2612 if (rdev
->mddev
->pers
&& slot
== -1) {
2613 /* Setting 'slot' on an active array requires also
2614 * updating the 'rd%d' link, and communicating
2615 * with the personality with ->hot_*_disk.
2616 * For now we only support removing
2617 * failed/spare devices. This normally happens automatically,
2618 * but not when the metadata is externally managed.
2620 if (rdev
->raid_disk
== -1)
2622 /* personality does all needed checks */
2623 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2625 clear_bit(Blocked
, &rdev
->flags
);
2626 remove_and_add_spares(rdev
->mddev
, rdev
);
2627 if (rdev
->raid_disk
>= 0)
2629 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2630 md_wakeup_thread(rdev
->mddev
->thread
);
2631 } else if (rdev
->mddev
->pers
) {
2632 /* Activating a spare .. or possibly reactivating
2633 * if we ever get bitmaps working here.
2636 if (rdev
->raid_disk
!= -1)
2639 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2642 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2645 if (slot
>= rdev
->mddev
->raid_disks
&&
2646 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2649 rdev
->raid_disk
= slot
;
2650 if (test_bit(In_sync
, &rdev
->flags
))
2651 rdev
->saved_raid_disk
= slot
;
2653 rdev
->saved_raid_disk
= -1;
2654 clear_bit(In_sync
, &rdev
->flags
);
2655 clear_bit(Bitmap_sync
, &rdev
->flags
);
2656 err
= rdev
->mddev
->pers
->
2657 hot_add_disk(rdev
->mddev
, rdev
);
2659 rdev
->raid_disk
= -1;
2662 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2663 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2664 /* failure here is OK */;
2665 /* don't wakeup anyone, leave that to userspace. */
2667 if (slot
>= rdev
->mddev
->raid_disks
&&
2668 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2670 rdev
->raid_disk
= slot
;
2671 /* assume it is working */
2672 clear_bit(Faulty
, &rdev
->flags
);
2673 clear_bit(WriteMostly
, &rdev
->flags
);
2674 set_bit(In_sync
, &rdev
->flags
);
2675 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2680 static struct rdev_sysfs_entry rdev_slot
=
2681 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2684 offset_show(struct md_rdev
*rdev
, char *page
)
2686 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2690 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2692 unsigned long long offset
;
2693 if (kstrtoull(buf
, 10, &offset
) < 0)
2695 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2697 if (rdev
->sectors
&& rdev
->mddev
->external
)
2698 /* Must set offset before size, so overlap checks
2701 rdev
->data_offset
= offset
;
2702 rdev
->new_data_offset
= offset
;
2706 static struct rdev_sysfs_entry rdev_offset
=
2707 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2709 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2711 return sprintf(page
, "%llu\n",
2712 (unsigned long long)rdev
->new_data_offset
);
2715 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2716 const char *buf
, size_t len
)
2718 unsigned long long new_offset
;
2719 struct mddev
*mddev
= rdev
->mddev
;
2721 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2724 if (mddev
->sync_thread
||
2725 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2727 if (new_offset
== rdev
->data_offset
)
2728 /* reset is always permitted */
2730 else if (new_offset
> rdev
->data_offset
) {
2731 /* must not push array size beyond rdev_sectors */
2732 if (new_offset
- rdev
->data_offset
2733 + mddev
->dev_sectors
> rdev
->sectors
)
2736 /* Metadata worries about other space details. */
2738 /* decreasing the offset is inconsistent with a backwards
2741 if (new_offset
< rdev
->data_offset
&&
2742 mddev
->reshape_backwards
)
2744 /* Increasing offset is inconsistent with forwards
2745 * reshape. reshape_direction should be set to
2746 * 'backwards' first.
2748 if (new_offset
> rdev
->data_offset
&&
2749 !mddev
->reshape_backwards
)
2752 if (mddev
->pers
&& mddev
->persistent
&&
2753 !super_types
[mddev
->major_version
]
2754 .allow_new_offset(rdev
, new_offset
))
2756 rdev
->new_data_offset
= new_offset
;
2757 if (new_offset
> rdev
->data_offset
)
2758 mddev
->reshape_backwards
= 1;
2759 else if (new_offset
< rdev
->data_offset
)
2760 mddev
->reshape_backwards
= 0;
2764 static struct rdev_sysfs_entry rdev_new_offset
=
2765 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2768 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2770 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2773 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2775 /* check if two start/length pairs overlap */
2783 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2785 unsigned long long blocks
;
2788 if (kstrtoull(buf
, 10, &blocks
) < 0)
2791 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2792 return -EINVAL
; /* sector conversion overflow */
2795 if (new != blocks
* 2)
2796 return -EINVAL
; /* unsigned long long to sector_t overflow */
2803 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2805 struct mddev
*my_mddev
= rdev
->mddev
;
2806 sector_t oldsectors
= rdev
->sectors
;
2809 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2811 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2812 return -EINVAL
; /* too confusing */
2813 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2814 if (my_mddev
->persistent
) {
2815 sectors
= super_types
[my_mddev
->major_version
].
2816 rdev_size_change(rdev
, sectors
);
2819 } else if (!sectors
)
2820 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2822 if (!my_mddev
->pers
->resize
)
2823 /* Cannot change size for RAID0 or Linear etc */
2826 if (sectors
< my_mddev
->dev_sectors
)
2827 return -EINVAL
; /* component must fit device */
2829 rdev
->sectors
= sectors
;
2830 if (sectors
> oldsectors
&& my_mddev
->external
) {
2831 /* Need to check that all other rdevs with the same
2832 * ->bdev do not overlap. 'rcu' is sufficient to walk
2833 * the rdev lists safely.
2834 * This check does not provide a hard guarantee, it
2835 * just helps avoid dangerous mistakes.
2837 struct mddev
*mddev
;
2839 struct list_head
*tmp
;
2842 for_each_mddev(mddev
, tmp
) {
2843 struct md_rdev
*rdev2
;
2845 rdev_for_each(rdev2
, mddev
)
2846 if (rdev
->bdev
== rdev2
->bdev
&&
2848 overlaps(rdev
->data_offset
, rdev
->sectors
,
2861 /* Someone else could have slipped in a size
2862 * change here, but doing so is just silly.
2863 * We put oldsectors back because we *know* it is
2864 * safe, and trust userspace not to race with
2867 rdev
->sectors
= oldsectors
;
2874 static struct rdev_sysfs_entry rdev_size
=
2875 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2877 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2879 unsigned long long recovery_start
= rdev
->recovery_offset
;
2881 if (test_bit(In_sync
, &rdev
->flags
) ||
2882 recovery_start
== MaxSector
)
2883 return sprintf(page
, "none\n");
2885 return sprintf(page
, "%llu\n", recovery_start
);
2888 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2890 unsigned long long recovery_start
;
2892 if (cmd_match(buf
, "none"))
2893 recovery_start
= MaxSector
;
2894 else if (kstrtoull(buf
, 10, &recovery_start
))
2897 if (rdev
->mddev
->pers
&&
2898 rdev
->raid_disk
>= 0)
2901 rdev
->recovery_offset
= recovery_start
;
2902 if (recovery_start
== MaxSector
)
2903 set_bit(In_sync
, &rdev
->flags
);
2905 clear_bit(In_sync
, &rdev
->flags
);
2909 static struct rdev_sysfs_entry rdev_recovery_start
=
2910 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2913 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2915 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2917 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2919 return badblocks_show(&rdev
->badblocks
, page
, 0);
2921 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2923 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2924 /* Maybe that ack was all we needed */
2925 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2926 wake_up(&rdev
->blocked_wait
);
2929 static struct rdev_sysfs_entry rdev_bad_blocks
=
2930 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2932 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2934 return badblocks_show(&rdev
->badblocks
, page
, 1);
2936 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2938 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2940 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2941 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2943 static struct attribute
*rdev_default_attrs
[] = {
2948 &rdev_new_offset
.attr
,
2950 &rdev_recovery_start
.attr
,
2951 &rdev_bad_blocks
.attr
,
2952 &rdev_unack_bad_blocks
.attr
,
2956 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2958 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2959 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2965 return entry
->show(rdev
, page
);
2969 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2970 const char *page
, size_t length
)
2972 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2973 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2975 struct mddev
*mddev
= rdev
->mddev
;
2979 if (!capable(CAP_SYS_ADMIN
))
2981 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2983 if (rdev
->mddev
== NULL
)
2986 rv
= entry
->store(rdev
, page
, length
);
2987 mddev_unlock(mddev
);
2992 static void rdev_free(struct kobject
*ko
)
2994 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
2997 static const struct sysfs_ops rdev_sysfs_ops
= {
2998 .show
= rdev_attr_show
,
2999 .store
= rdev_attr_store
,
3001 static struct kobj_type rdev_ktype
= {
3002 .release
= rdev_free
,
3003 .sysfs_ops
= &rdev_sysfs_ops
,
3004 .default_attrs
= rdev_default_attrs
,
3007 int md_rdev_init(struct md_rdev
*rdev
)
3010 rdev
->saved_raid_disk
= -1;
3011 rdev
->raid_disk
= -1;
3013 rdev
->data_offset
= 0;
3014 rdev
->new_data_offset
= 0;
3015 rdev
->sb_events
= 0;
3016 rdev
->last_read_error
.tv_sec
= 0;
3017 rdev
->last_read_error
.tv_nsec
= 0;
3018 rdev
->sb_loaded
= 0;
3019 rdev
->bb_page
= NULL
;
3020 atomic_set(&rdev
->nr_pending
, 0);
3021 atomic_set(&rdev
->read_errors
, 0);
3022 atomic_set(&rdev
->corrected_errors
, 0);
3024 INIT_LIST_HEAD(&rdev
->same_set
);
3025 init_waitqueue_head(&rdev
->blocked_wait
);
3027 /* Add space to store bad block list.
3028 * This reserves the space even on arrays where it cannot
3029 * be used - I wonder if that matters
3031 rdev
->badblocks
.count
= 0;
3032 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3033 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3034 seqlock_init(&rdev
->badblocks
.lock
);
3035 if (rdev
->badblocks
.page
== NULL
)
3040 EXPORT_SYMBOL_GPL(md_rdev_init
);
3042 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3044 * mark the device faulty if:
3046 * - the device is nonexistent (zero size)
3047 * - the device has no valid superblock
3049 * a faulty rdev _never_ has rdev->sb set.
3051 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3053 char b
[BDEVNAME_SIZE
];
3055 struct md_rdev
*rdev
;
3058 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3060 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3061 return ERR_PTR(-ENOMEM
);
3064 err
= md_rdev_init(rdev
);
3067 err
= alloc_disk_sb(rdev
);
3071 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3075 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3077 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3080 "md: %s has zero or unknown size, marking faulty!\n",
3081 bdevname(rdev
->bdev
,b
));
3086 if (super_format
>= 0) {
3087 err
= super_types
[super_format
].
3088 load_super(rdev
, NULL
, super_minor
);
3089 if (err
== -EINVAL
) {
3091 "md: %s does not have a valid v%d.%d "
3092 "superblock, not importing!\n",
3093 bdevname(rdev
->bdev
,b
),
3094 super_format
, super_minor
);
3099 "md: could not read %s's sb, not importing!\n",
3100 bdevname(rdev
->bdev
,b
));
3110 md_rdev_clear(rdev
);
3112 return ERR_PTR(err
);
3116 * Check a full RAID array for plausibility
3119 static void analyze_sbs(struct mddev
*mddev
)
3122 struct md_rdev
*rdev
, *freshest
, *tmp
;
3123 char b
[BDEVNAME_SIZE
];
3126 rdev_for_each_safe(rdev
, tmp
, mddev
)
3127 switch (super_types
[mddev
->major_version
].
3128 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3136 "md: fatal superblock inconsistency in %s"
3137 " -- removing from array\n",
3138 bdevname(rdev
->bdev
,b
));
3139 md_kick_rdev_from_array(rdev
);
3142 super_types
[mddev
->major_version
].
3143 validate_super(mddev
, freshest
);
3146 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3147 if (mddev
->max_disks
&&
3148 (rdev
->desc_nr
>= mddev
->max_disks
||
3149 i
> mddev
->max_disks
)) {
3151 "md: %s: %s: only %d devices permitted\n",
3152 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3154 md_kick_rdev_from_array(rdev
);
3157 if (rdev
!= freshest
) {
3158 if (super_types
[mddev
->major_version
].
3159 validate_super(mddev
, rdev
)) {
3160 printk(KERN_WARNING
"md: kicking non-fresh %s"
3162 bdevname(rdev
->bdev
,b
));
3163 md_kick_rdev_from_array(rdev
);
3166 /* No device should have a Candidate flag
3167 * when reading devices
3169 if (test_bit(Candidate
, &rdev
->flags
)) {
3170 pr_info("md: kicking Cluster Candidate %s from array!\n",
3171 bdevname(rdev
->bdev
, b
));
3172 md_kick_rdev_from_array(rdev
);
3175 if (mddev
->level
== LEVEL_MULTIPATH
) {
3176 rdev
->desc_nr
= i
++;
3177 rdev
->raid_disk
= rdev
->desc_nr
;
3178 set_bit(In_sync
, &rdev
->flags
);
3179 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3180 rdev
->raid_disk
= -1;
3181 clear_bit(In_sync
, &rdev
->flags
);
3186 /* Read a fixed-point number.
3187 * Numbers in sysfs attributes should be in "standard" units where
3188 * possible, so time should be in seconds.
3189 * However we internally use a a much smaller unit such as
3190 * milliseconds or jiffies.
3191 * This function takes a decimal number with a possible fractional
3192 * component, and produces an integer which is the result of
3193 * multiplying that number by 10^'scale'.
3194 * all without any floating-point arithmetic.
3196 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3198 unsigned long result
= 0;
3200 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3203 else if (decimals
< scale
) {
3206 result
= result
* 10 + value
;
3218 while (decimals
< scale
) {
3226 static void md_safemode_timeout(unsigned long data
);
3229 safe_delay_show(struct mddev
*mddev
, char *page
)
3231 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3232 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3235 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3239 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3242 mddev
->safemode_delay
= 0;
3244 unsigned long old_delay
= mddev
->safemode_delay
;
3245 unsigned long new_delay
= (msec
*HZ
)/1000;
3249 mddev
->safemode_delay
= new_delay
;
3250 if (new_delay
< old_delay
|| old_delay
== 0)
3251 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3255 static struct md_sysfs_entry md_safe_delay
=
3256 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3259 level_show(struct mddev
*mddev
, char *page
)
3261 struct md_personality
*p
;
3263 spin_lock(&mddev
->lock
);
3266 ret
= sprintf(page
, "%s\n", p
->name
);
3267 else if (mddev
->clevel
[0])
3268 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3269 else if (mddev
->level
!= LEVEL_NONE
)
3270 ret
= sprintf(page
, "%d\n", mddev
->level
);
3273 spin_unlock(&mddev
->lock
);
3278 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3283 struct md_personality
*pers
, *oldpers
;
3285 void *priv
, *oldpriv
;
3286 struct md_rdev
*rdev
;
3288 if (slen
== 0 || slen
>= sizeof(clevel
))
3291 rv
= mddev_lock(mddev
);
3295 if (mddev
->pers
== NULL
) {
3296 strncpy(mddev
->clevel
, buf
, slen
);
3297 if (mddev
->clevel
[slen
-1] == '\n')
3299 mddev
->clevel
[slen
] = 0;
3300 mddev
->level
= LEVEL_NONE
;
3308 /* request to change the personality. Need to ensure:
3309 * - array is not engaged in resync/recovery/reshape
3310 * - old personality can be suspended
3311 * - new personality will access other array.
3315 if (mddev
->sync_thread
||
3316 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3317 mddev
->reshape_position
!= MaxSector
||
3318 mddev
->sysfs_active
)
3322 if (!mddev
->pers
->quiesce
) {
3323 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3324 mdname(mddev
), mddev
->pers
->name
);
3328 /* Now find the new personality */
3329 strncpy(clevel
, buf
, slen
);
3330 if (clevel
[slen
-1] == '\n')
3333 if (kstrtol(clevel
, 10, &level
))
3336 if (request_module("md-%s", clevel
) != 0)
3337 request_module("md-level-%s", clevel
);
3338 spin_lock(&pers_lock
);
3339 pers
= find_pers(level
, clevel
);
3340 if (!pers
|| !try_module_get(pers
->owner
)) {
3341 spin_unlock(&pers_lock
);
3342 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3346 spin_unlock(&pers_lock
);
3348 if (pers
== mddev
->pers
) {
3349 /* Nothing to do! */
3350 module_put(pers
->owner
);
3354 if (!pers
->takeover
) {
3355 module_put(pers
->owner
);
3356 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3357 mdname(mddev
), clevel
);
3362 rdev_for_each(rdev
, mddev
)
3363 rdev
->new_raid_disk
= rdev
->raid_disk
;
3365 /* ->takeover must set new_* and/or delta_disks
3366 * if it succeeds, and may set them when it fails.
3368 priv
= pers
->takeover(mddev
);
3370 mddev
->new_level
= mddev
->level
;
3371 mddev
->new_layout
= mddev
->layout
;
3372 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3373 mddev
->raid_disks
-= mddev
->delta_disks
;
3374 mddev
->delta_disks
= 0;
3375 mddev
->reshape_backwards
= 0;
3376 module_put(pers
->owner
);
3377 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3378 mdname(mddev
), clevel
);
3383 /* Looks like we have a winner */
3384 mddev_suspend(mddev
);
3385 mddev_detach(mddev
);
3387 spin_lock(&mddev
->lock
);
3388 oldpers
= mddev
->pers
;
3389 oldpriv
= mddev
->private;
3391 mddev
->private = priv
;
3392 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3393 mddev
->level
= mddev
->new_level
;
3394 mddev
->layout
= mddev
->new_layout
;
3395 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3396 mddev
->delta_disks
= 0;
3397 mddev
->reshape_backwards
= 0;
3398 mddev
->degraded
= 0;
3399 spin_unlock(&mddev
->lock
);
3401 if (oldpers
->sync_request
== NULL
&&
3403 /* We are converting from a no-redundancy array
3404 * to a redundancy array and metadata is managed
3405 * externally so we need to be sure that writes
3406 * won't block due to a need to transition
3408 * until external management is started.
3411 mddev
->safemode_delay
= 0;
3412 mddev
->safemode
= 0;
3415 oldpers
->free(mddev
, oldpriv
);
3417 if (oldpers
->sync_request
== NULL
&&
3418 pers
->sync_request
!= NULL
) {
3419 /* need to add the md_redundancy_group */
3420 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3422 "md: cannot register extra attributes for %s\n",
3424 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3426 if (oldpers
->sync_request
!= NULL
&&
3427 pers
->sync_request
== NULL
) {
3428 /* need to remove the md_redundancy_group */
3429 if (mddev
->to_remove
== NULL
)
3430 mddev
->to_remove
= &md_redundancy_group
;
3433 rdev_for_each(rdev
, mddev
) {
3434 if (rdev
->raid_disk
< 0)
3436 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3437 rdev
->new_raid_disk
= -1;
3438 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3440 sysfs_unlink_rdev(mddev
, rdev
);
3442 rdev_for_each(rdev
, mddev
) {
3443 if (rdev
->raid_disk
< 0)
3445 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3447 rdev
->raid_disk
= rdev
->new_raid_disk
;
3448 if (rdev
->raid_disk
< 0)
3449 clear_bit(In_sync
, &rdev
->flags
);
3451 if (sysfs_link_rdev(mddev
, rdev
))
3452 printk(KERN_WARNING
"md: cannot register rd%d"
3453 " for %s after level change\n",
3454 rdev
->raid_disk
, mdname(mddev
));
3458 if (pers
->sync_request
== NULL
) {
3459 /* this is now an array without redundancy, so
3460 * it must always be in_sync
3463 del_timer_sync(&mddev
->safemode_timer
);
3465 blk_set_stacking_limits(&mddev
->queue
->limits
);
3467 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3468 mddev_resume(mddev
);
3470 md_update_sb(mddev
, 1);
3471 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3472 md_new_event(mddev
);
3475 mddev_unlock(mddev
);
3479 static struct md_sysfs_entry md_level
=
3480 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3483 layout_show(struct mddev
*mddev
, char *page
)
3485 /* just a number, not meaningful for all levels */
3486 if (mddev
->reshape_position
!= MaxSector
&&
3487 mddev
->layout
!= mddev
->new_layout
)
3488 return sprintf(page
, "%d (%d)\n",
3489 mddev
->new_layout
, mddev
->layout
);
3490 return sprintf(page
, "%d\n", mddev
->layout
);
3494 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3497 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3500 if (!*buf
|| (*e
&& *e
!= '\n'))
3502 err
= mddev_lock(mddev
);
3507 if (mddev
->pers
->check_reshape
== NULL
)
3512 mddev
->new_layout
= n
;
3513 err
= mddev
->pers
->check_reshape(mddev
);
3515 mddev
->new_layout
= mddev
->layout
;
3518 mddev
->new_layout
= n
;
3519 if (mddev
->reshape_position
== MaxSector
)
3522 mddev_unlock(mddev
);
3525 static struct md_sysfs_entry md_layout
=
3526 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3529 raid_disks_show(struct mddev
*mddev
, char *page
)
3531 if (mddev
->raid_disks
== 0)
3533 if (mddev
->reshape_position
!= MaxSector
&&
3534 mddev
->delta_disks
!= 0)
3535 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3536 mddev
->raid_disks
- mddev
->delta_disks
);
3537 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3540 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3543 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3547 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3549 if (!*buf
|| (*e
&& *e
!= '\n'))
3552 err
= mddev_lock(mddev
);
3556 err
= update_raid_disks(mddev
, n
);
3557 else if (mddev
->reshape_position
!= MaxSector
) {
3558 struct md_rdev
*rdev
;
3559 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3562 rdev_for_each(rdev
, mddev
) {
3564 rdev
->data_offset
< rdev
->new_data_offset
)
3567 rdev
->data_offset
> rdev
->new_data_offset
)
3571 mddev
->delta_disks
= n
- olddisks
;
3572 mddev
->raid_disks
= n
;
3573 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3575 mddev
->raid_disks
= n
;
3577 mddev_unlock(mddev
);
3578 return err
? err
: len
;
3580 static struct md_sysfs_entry md_raid_disks
=
3581 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3584 chunk_size_show(struct mddev
*mddev
, char *page
)
3586 if (mddev
->reshape_position
!= MaxSector
&&
3587 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3588 return sprintf(page
, "%d (%d)\n",
3589 mddev
->new_chunk_sectors
<< 9,
3590 mddev
->chunk_sectors
<< 9);
3591 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3595 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3599 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3601 if (!*buf
|| (*e
&& *e
!= '\n'))
3604 err
= mddev_lock(mddev
);
3608 if (mddev
->pers
->check_reshape
== NULL
)
3613 mddev
->new_chunk_sectors
= n
>> 9;
3614 err
= mddev
->pers
->check_reshape(mddev
);
3616 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3619 mddev
->new_chunk_sectors
= n
>> 9;
3620 if (mddev
->reshape_position
== MaxSector
)
3621 mddev
->chunk_sectors
= n
>> 9;
3623 mddev_unlock(mddev
);
3626 static struct md_sysfs_entry md_chunk_size
=
3627 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3630 resync_start_show(struct mddev
*mddev
, char *page
)
3632 if (mddev
->recovery_cp
== MaxSector
)
3633 return sprintf(page
, "none\n");
3634 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3638 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3642 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3644 err
= mddev_lock(mddev
);
3647 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3649 else if (cmd_match(buf
, "none"))
3651 else if (!*buf
|| (*e
&& *e
!= '\n'))
3655 mddev
->recovery_cp
= n
;
3657 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3659 mddev_unlock(mddev
);
3662 static struct md_sysfs_entry md_resync_start
=
3663 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3666 * The array state can be:
3669 * No devices, no size, no level
3670 * Equivalent to STOP_ARRAY ioctl
3672 * May have some settings, but array is not active
3673 * all IO results in error
3674 * When written, doesn't tear down array, but just stops it
3675 * suspended (not supported yet)
3676 * All IO requests will block. The array can be reconfigured.
3677 * Writing this, if accepted, will block until array is quiescent
3679 * no resync can happen. no superblocks get written.
3680 * write requests fail
3682 * like readonly, but behaves like 'clean' on a write request.
3684 * clean - no pending writes, but otherwise active.
3685 * When written to inactive array, starts without resync
3686 * If a write request arrives then
3687 * if metadata is known, mark 'dirty' and switch to 'active'.
3688 * if not known, block and switch to write-pending
3689 * If written to an active array that has pending writes, then fails.
3691 * fully active: IO and resync can be happening.
3692 * When written to inactive array, starts with resync
3695 * clean, but writes are blocked waiting for 'active' to be written.
3698 * like active, but no writes have been seen for a while (100msec).
3701 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3702 write_pending
, active_idle
, bad_word
};
3703 static char *array_states
[] = {
3704 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3705 "write-pending", "active-idle", NULL
};
3707 static int match_word(const char *word
, char **list
)
3710 for (n
=0; list
[n
]; n
++)
3711 if (cmd_match(word
, list
[n
]))
3717 array_state_show(struct mddev
*mddev
, char *page
)
3719 enum array_state st
= inactive
;
3732 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3734 else if (mddev
->safemode
)
3740 if (list_empty(&mddev
->disks
) &&
3741 mddev
->raid_disks
== 0 &&
3742 mddev
->dev_sectors
== 0)
3747 return sprintf(page
, "%s\n", array_states
[st
]);
3750 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3751 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3752 static int do_md_run(struct mddev
*mddev
);
3753 static int restart_array(struct mddev
*mddev
);
3756 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3759 enum array_state st
= match_word(buf
, array_states
);
3761 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3762 /* don't take reconfig_mutex when toggling between
3765 spin_lock(&mddev
->lock
);
3767 restart_array(mddev
);
3768 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3769 wake_up(&mddev
->sb_wait
);
3771 } else /* st == clean */ {
3772 restart_array(mddev
);
3773 if (atomic_read(&mddev
->writes_pending
) == 0) {
3774 if (mddev
->in_sync
== 0) {
3776 if (mddev
->safemode
== 1)
3777 mddev
->safemode
= 0;
3778 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3784 spin_unlock(&mddev
->lock
);
3787 err
= mddev_lock(mddev
);
3795 /* stopping an active array */
3796 err
= do_md_stop(mddev
, 0, NULL
);
3799 /* stopping an active array */
3801 err
= do_md_stop(mddev
, 2, NULL
);
3803 err
= 0; /* already inactive */
3806 break; /* not supported yet */
3809 err
= md_set_readonly(mddev
, NULL
);
3812 set_disk_ro(mddev
->gendisk
, 1);
3813 err
= do_md_run(mddev
);
3819 err
= md_set_readonly(mddev
, NULL
);
3820 else if (mddev
->ro
== 1)
3821 err
= restart_array(mddev
);
3824 set_disk_ro(mddev
->gendisk
, 0);
3828 err
= do_md_run(mddev
);
3833 restart_array(mddev
);
3834 spin_lock(&mddev
->lock
);
3835 if (atomic_read(&mddev
->writes_pending
) == 0) {
3836 if (mddev
->in_sync
== 0) {
3838 if (mddev
->safemode
== 1)
3839 mddev
->safemode
= 0;
3840 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3845 spin_unlock(&mddev
->lock
);
3851 restart_array(mddev
);
3852 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3853 wake_up(&mddev
->sb_wait
);
3857 set_disk_ro(mddev
->gendisk
, 0);
3858 err
= do_md_run(mddev
);
3863 /* these cannot be set */
3868 if (mddev
->hold_active
== UNTIL_IOCTL
)
3869 mddev
->hold_active
= 0;
3870 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3872 mddev_unlock(mddev
);
3875 static struct md_sysfs_entry md_array_state
=
3876 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3879 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3880 return sprintf(page
, "%d\n",
3881 atomic_read(&mddev
->max_corr_read_errors
));
3885 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3888 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3890 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3891 atomic_set(&mddev
->max_corr_read_errors
, n
);
3897 static struct md_sysfs_entry max_corr_read_errors
=
3898 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3899 max_corrected_read_errors_store
);
3902 null_show(struct mddev
*mddev
, char *page
)
3908 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3910 /* buf must be %d:%d\n? giving major and minor numbers */
3911 /* The new device is added to the array.
3912 * If the array has a persistent superblock, we read the
3913 * superblock to initialise info and check validity.
3914 * Otherwise, only checking done is that in bind_rdev_to_array,
3915 * which mainly checks size.
3918 int major
= simple_strtoul(buf
, &e
, 10);
3921 struct md_rdev
*rdev
;
3924 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3926 minor
= simple_strtoul(e
+1, &e
, 10);
3927 if (*e
&& *e
!= '\n')
3929 dev
= MKDEV(major
, minor
);
3930 if (major
!= MAJOR(dev
) ||
3931 minor
!= MINOR(dev
))
3934 flush_workqueue(md_misc_wq
);
3936 err
= mddev_lock(mddev
);
3939 if (mddev
->persistent
) {
3940 rdev
= md_import_device(dev
, mddev
->major_version
,
3941 mddev
->minor_version
);
3942 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3943 struct md_rdev
*rdev0
3944 = list_entry(mddev
->disks
.next
,
3945 struct md_rdev
, same_set
);
3946 err
= super_types
[mddev
->major_version
]
3947 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3951 } else if (mddev
->external
)
3952 rdev
= md_import_device(dev
, -2, -1);
3954 rdev
= md_import_device(dev
, -1, -1);
3957 return PTR_ERR(rdev
);
3958 err
= bind_rdev_to_array(rdev
, mddev
);
3962 mddev_unlock(mddev
);
3963 return err
? err
: len
;
3966 static struct md_sysfs_entry md_new_device
=
3967 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3970 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3973 unsigned long chunk
, end_chunk
;
3976 err
= mddev_lock(mddev
);
3981 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3983 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3984 if (buf
== end
) break;
3985 if (*end
== '-') { /* range */
3987 end_chunk
= simple_strtoul(buf
, &end
, 0);
3988 if (buf
== end
) break;
3990 if (*end
&& !isspace(*end
)) break;
3991 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3992 buf
= skip_spaces(end
);
3994 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3996 mddev_unlock(mddev
);
4000 static struct md_sysfs_entry md_bitmap
=
4001 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4004 size_show(struct mddev
*mddev
, char *page
)
4006 return sprintf(page
, "%llu\n",
4007 (unsigned long long)mddev
->dev_sectors
/ 2);
4010 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4013 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4015 /* If array is inactive, we can reduce the component size, but
4016 * not increase it (except from 0).
4017 * If array is active, we can try an on-line resize
4020 int err
= strict_blocks_to_sectors(buf
, §ors
);
4024 err
= mddev_lock(mddev
);
4028 if (mddev_is_clustered(mddev
))
4029 md_cluster_ops
->metadata_update_start(mddev
);
4030 err
= update_size(mddev
, sectors
);
4031 md_update_sb(mddev
, 1);
4032 if (mddev_is_clustered(mddev
))
4033 md_cluster_ops
->metadata_update_finish(mddev
);
4035 if (mddev
->dev_sectors
== 0 ||
4036 mddev
->dev_sectors
> sectors
)
4037 mddev
->dev_sectors
= sectors
;
4041 mddev_unlock(mddev
);
4042 return err
? err
: len
;
4045 static struct md_sysfs_entry md_size
=
4046 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4048 /* Metadata version.
4050 * 'none' for arrays with no metadata (good luck...)
4051 * 'external' for arrays with externally managed metadata,
4052 * or N.M for internally known formats
4055 metadata_show(struct mddev
*mddev
, char *page
)
4057 if (mddev
->persistent
)
4058 return sprintf(page
, "%d.%d\n",
4059 mddev
->major_version
, mddev
->minor_version
);
4060 else if (mddev
->external
)
4061 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4063 return sprintf(page
, "none\n");
4067 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4072 /* Changing the details of 'external' metadata is
4073 * always permitted. Otherwise there must be
4074 * no devices attached to the array.
4077 err
= mddev_lock(mddev
);
4081 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4083 else if (!list_empty(&mddev
->disks
))
4087 if (cmd_match(buf
, "none")) {
4088 mddev
->persistent
= 0;
4089 mddev
->external
= 0;
4090 mddev
->major_version
= 0;
4091 mddev
->minor_version
= 90;
4094 if (strncmp(buf
, "external:", 9) == 0) {
4095 size_t namelen
= len
-9;
4096 if (namelen
>= sizeof(mddev
->metadata_type
))
4097 namelen
= sizeof(mddev
->metadata_type
)-1;
4098 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4099 mddev
->metadata_type
[namelen
] = 0;
4100 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4101 mddev
->metadata_type
[--namelen
] = 0;
4102 mddev
->persistent
= 0;
4103 mddev
->external
= 1;
4104 mddev
->major_version
= 0;
4105 mddev
->minor_version
= 90;
4108 major
= simple_strtoul(buf
, &e
, 10);
4110 if (e
==buf
|| *e
!= '.')
4113 minor
= simple_strtoul(buf
, &e
, 10);
4114 if (e
==buf
|| (*e
&& *e
!= '\n') )
4117 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4119 mddev
->major_version
= major
;
4120 mddev
->minor_version
= minor
;
4121 mddev
->persistent
= 1;
4122 mddev
->external
= 0;
4125 mddev_unlock(mddev
);
4129 static struct md_sysfs_entry md_metadata
=
4130 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4133 action_show(struct mddev
*mddev
, char *page
)
4135 char *type
= "idle";
4136 unsigned long recovery
= mddev
->recovery
;
4137 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4139 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4140 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4141 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4143 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4144 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4146 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4150 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4153 return sprintf(page
, "%s\n", type
);
4157 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4159 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4162 if (cmd_match(page
, "frozen"))
4163 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4165 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4167 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4168 flush_workqueue(md_misc_wq
);
4169 if (mddev
->sync_thread
) {
4170 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4171 if (mddev_lock(mddev
) == 0) {
4172 md_reap_sync_thread(mddev
);
4173 mddev_unlock(mddev
);
4176 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4177 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4179 else if (cmd_match(page
, "resync"))
4180 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4181 else if (cmd_match(page
, "recover")) {
4182 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4183 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4184 } else if (cmd_match(page
, "reshape")) {
4186 if (mddev
->pers
->start_reshape
== NULL
)
4188 err
= mddev_lock(mddev
);
4190 err
= mddev
->pers
->start_reshape(mddev
);
4191 mddev_unlock(mddev
);
4195 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4197 if (cmd_match(page
, "check"))
4198 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4199 else if (!cmd_match(page
, "repair"))
4201 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4202 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4204 if (mddev
->ro
== 2) {
4205 /* A write to sync_action is enough to justify
4206 * canceling read-auto mode
4209 md_wakeup_thread(mddev
->sync_thread
);
4211 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4212 md_wakeup_thread(mddev
->thread
);
4213 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4217 static struct md_sysfs_entry md_scan_mode
=
4218 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4221 last_sync_action_show(struct mddev
*mddev
, char *page
)
4223 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4226 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4229 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4231 return sprintf(page
, "%llu\n",
4232 (unsigned long long)
4233 atomic64_read(&mddev
->resync_mismatches
));
4236 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4239 sync_min_show(struct mddev
*mddev
, char *page
)
4241 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4242 mddev
->sync_speed_min
? "local": "system");
4246 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4250 if (strncmp(buf
, "system", 6)==0) {
4251 mddev
->sync_speed_min
= 0;
4254 min
= simple_strtoul(buf
, &e
, 10);
4255 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4257 mddev
->sync_speed_min
= min
;
4261 static struct md_sysfs_entry md_sync_min
=
4262 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4265 sync_max_show(struct mddev
*mddev
, char *page
)
4267 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4268 mddev
->sync_speed_max
? "local": "system");
4272 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4276 if (strncmp(buf
, "system", 6)==0) {
4277 mddev
->sync_speed_max
= 0;
4280 max
= simple_strtoul(buf
, &e
, 10);
4281 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4283 mddev
->sync_speed_max
= max
;
4287 static struct md_sysfs_entry md_sync_max
=
4288 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4291 degraded_show(struct mddev
*mddev
, char *page
)
4293 return sprintf(page
, "%d\n", mddev
->degraded
);
4295 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4298 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4300 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4304 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4308 if (kstrtol(buf
, 10, &n
))
4311 if (n
!= 0 && n
!= 1)
4314 mddev
->parallel_resync
= n
;
4316 if (mddev
->sync_thread
)
4317 wake_up(&resync_wait
);
4322 /* force parallel resync, even with shared block devices */
4323 static struct md_sysfs_entry md_sync_force_parallel
=
4324 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4325 sync_force_parallel_show
, sync_force_parallel_store
);
4328 sync_speed_show(struct mddev
*mddev
, char *page
)
4330 unsigned long resync
, dt
, db
;
4331 if (mddev
->curr_resync
== 0)
4332 return sprintf(page
, "none\n");
4333 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4334 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4336 db
= resync
- mddev
->resync_mark_cnt
;
4337 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4340 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4343 sync_completed_show(struct mddev
*mddev
, char *page
)
4345 unsigned long long max_sectors
, resync
;
4347 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4348 return sprintf(page
, "none\n");
4350 if (mddev
->curr_resync
== 1 ||
4351 mddev
->curr_resync
== 2)
4352 return sprintf(page
, "delayed\n");
4354 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4355 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4356 max_sectors
= mddev
->resync_max_sectors
;
4358 max_sectors
= mddev
->dev_sectors
;
4360 resync
= mddev
->curr_resync_completed
;
4361 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4364 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4367 min_sync_show(struct mddev
*mddev
, char *page
)
4369 return sprintf(page
, "%llu\n",
4370 (unsigned long long)mddev
->resync_min
);
4373 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4375 unsigned long long min
;
4379 if (kstrtoull(buf
, 10, &min
))
4382 spin_lock(&mddev
->lock
);
4384 if (min
> mddev
->resync_max
)
4388 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4391 /* Must be a multiple of chunk_size */
4392 chunk
= mddev
->chunk_sectors
;
4394 sector_t temp
= min
;
4397 if (sector_div(temp
, chunk
))
4400 mddev
->resync_min
= min
;
4404 spin_unlock(&mddev
->lock
);
4408 static struct md_sysfs_entry md_min_sync
=
4409 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4412 max_sync_show(struct mddev
*mddev
, char *page
)
4414 if (mddev
->resync_max
== MaxSector
)
4415 return sprintf(page
, "max\n");
4417 return sprintf(page
, "%llu\n",
4418 (unsigned long long)mddev
->resync_max
);
4421 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4424 spin_lock(&mddev
->lock
);
4425 if (strncmp(buf
, "max", 3) == 0)
4426 mddev
->resync_max
= MaxSector
;
4428 unsigned long long max
;
4432 if (kstrtoull(buf
, 10, &max
))
4434 if (max
< mddev
->resync_min
)
4438 if (max
< mddev
->resync_max
&&
4440 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4443 /* Must be a multiple of chunk_size */
4444 chunk
= mddev
->chunk_sectors
;
4446 sector_t temp
= max
;
4449 if (sector_div(temp
, chunk
))
4452 mddev
->resync_max
= max
;
4454 wake_up(&mddev
->recovery_wait
);
4457 spin_unlock(&mddev
->lock
);
4461 static struct md_sysfs_entry md_max_sync
=
4462 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4465 suspend_lo_show(struct mddev
*mddev
, char *page
)
4467 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4471 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4474 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4475 unsigned long long old
;
4478 if (buf
== e
|| (*e
&& *e
!= '\n'))
4481 err
= mddev_lock(mddev
);
4485 if (mddev
->pers
== NULL
||
4486 mddev
->pers
->quiesce
== NULL
)
4488 old
= mddev
->suspend_lo
;
4489 mddev
->suspend_lo
= new;
4491 /* Shrinking suspended region */
4492 mddev
->pers
->quiesce(mddev
, 2);
4494 /* Expanding suspended region - need to wait */
4495 mddev
->pers
->quiesce(mddev
, 1);
4496 mddev
->pers
->quiesce(mddev
, 0);
4500 mddev_unlock(mddev
);
4503 static struct md_sysfs_entry md_suspend_lo
=
4504 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4507 suspend_hi_show(struct mddev
*mddev
, char *page
)
4509 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4513 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4516 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4517 unsigned long long old
;
4520 if (buf
== e
|| (*e
&& *e
!= '\n'))
4523 err
= mddev_lock(mddev
);
4527 if (mddev
->pers
== NULL
||
4528 mddev
->pers
->quiesce
== NULL
)
4530 old
= mddev
->suspend_hi
;
4531 mddev
->suspend_hi
= new;
4533 /* Shrinking suspended region */
4534 mddev
->pers
->quiesce(mddev
, 2);
4536 /* Expanding suspended region - need to wait */
4537 mddev
->pers
->quiesce(mddev
, 1);
4538 mddev
->pers
->quiesce(mddev
, 0);
4542 mddev_unlock(mddev
);
4545 static struct md_sysfs_entry md_suspend_hi
=
4546 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4549 reshape_position_show(struct mddev
*mddev
, char *page
)
4551 if (mddev
->reshape_position
!= MaxSector
)
4552 return sprintf(page
, "%llu\n",
4553 (unsigned long long)mddev
->reshape_position
);
4554 strcpy(page
, "none\n");
4559 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4561 struct md_rdev
*rdev
;
4564 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4566 if (buf
== e
|| (*e
&& *e
!= '\n'))
4568 err
= mddev_lock(mddev
);
4574 mddev
->reshape_position
= new;
4575 mddev
->delta_disks
= 0;
4576 mddev
->reshape_backwards
= 0;
4577 mddev
->new_level
= mddev
->level
;
4578 mddev
->new_layout
= mddev
->layout
;
4579 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4580 rdev_for_each(rdev
, mddev
)
4581 rdev
->new_data_offset
= rdev
->data_offset
;
4584 mddev_unlock(mddev
);
4588 static struct md_sysfs_entry md_reshape_position
=
4589 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4590 reshape_position_store
);
4593 reshape_direction_show(struct mddev
*mddev
, char *page
)
4595 return sprintf(page
, "%s\n",
4596 mddev
->reshape_backwards
? "backwards" : "forwards");
4600 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4605 if (cmd_match(buf
, "forwards"))
4607 else if (cmd_match(buf
, "backwards"))
4611 if (mddev
->reshape_backwards
== backwards
)
4614 err
= mddev_lock(mddev
);
4617 /* check if we are allowed to change */
4618 if (mddev
->delta_disks
)
4620 else if (mddev
->persistent
&&
4621 mddev
->major_version
== 0)
4624 mddev
->reshape_backwards
= backwards
;
4625 mddev_unlock(mddev
);
4629 static struct md_sysfs_entry md_reshape_direction
=
4630 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4631 reshape_direction_store
);
4634 array_size_show(struct mddev
*mddev
, char *page
)
4636 if (mddev
->external_size
)
4637 return sprintf(page
, "%llu\n",
4638 (unsigned long long)mddev
->array_sectors
/2);
4640 return sprintf(page
, "default\n");
4644 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4649 err
= mddev_lock(mddev
);
4653 if (strncmp(buf
, "default", 7) == 0) {
4655 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4657 sectors
= mddev
->array_sectors
;
4659 mddev
->external_size
= 0;
4661 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4663 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4666 mddev
->external_size
= 1;
4670 mddev
->array_sectors
= sectors
;
4672 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4673 revalidate_disk(mddev
->gendisk
);
4676 mddev_unlock(mddev
);
4680 static struct md_sysfs_entry md_array_size
=
4681 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4684 static struct attribute
*md_default_attrs
[] = {
4687 &md_raid_disks
.attr
,
4688 &md_chunk_size
.attr
,
4690 &md_resync_start
.attr
,
4692 &md_new_device
.attr
,
4693 &md_safe_delay
.attr
,
4694 &md_array_state
.attr
,
4695 &md_reshape_position
.attr
,
4696 &md_reshape_direction
.attr
,
4697 &md_array_size
.attr
,
4698 &max_corr_read_errors
.attr
,
4702 static struct attribute
*md_redundancy_attrs
[] = {
4704 &md_last_scan_mode
.attr
,
4705 &md_mismatches
.attr
,
4708 &md_sync_speed
.attr
,
4709 &md_sync_force_parallel
.attr
,
4710 &md_sync_completed
.attr
,
4713 &md_suspend_lo
.attr
,
4714 &md_suspend_hi
.attr
,
4719 static struct attribute_group md_redundancy_group
= {
4721 .attrs
= md_redundancy_attrs
,
4725 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4727 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4728 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4733 spin_lock(&all_mddevs_lock
);
4734 if (list_empty(&mddev
->all_mddevs
)) {
4735 spin_unlock(&all_mddevs_lock
);
4739 spin_unlock(&all_mddevs_lock
);
4741 rv
= entry
->show(mddev
, page
);
4747 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4748 const char *page
, size_t length
)
4750 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4751 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4756 if (!capable(CAP_SYS_ADMIN
))
4758 spin_lock(&all_mddevs_lock
);
4759 if (list_empty(&mddev
->all_mddevs
)) {
4760 spin_unlock(&all_mddevs_lock
);
4764 spin_unlock(&all_mddevs_lock
);
4765 rv
= entry
->store(mddev
, page
, length
);
4770 static void md_free(struct kobject
*ko
)
4772 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4774 if (mddev
->sysfs_state
)
4775 sysfs_put(mddev
->sysfs_state
);
4777 if (mddev
->gendisk
) {
4778 del_gendisk(mddev
->gendisk
);
4779 put_disk(mddev
->gendisk
);
4782 blk_cleanup_queue(mddev
->queue
);
4787 static const struct sysfs_ops md_sysfs_ops
= {
4788 .show
= md_attr_show
,
4789 .store
= md_attr_store
,
4791 static struct kobj_type md_ktype
= {
4793 .sysfs_ops
= &md_sysfs_ops
,
4794 .default_attrs
= md_default_attrs
,
4799 static void mddev_delayed_delete(struct work_struct
*ws
)
4801 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4803 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4804 kobject_del(&mddev
->kobj
);
4805 kobject_put(&mddev
->kobj
);
4808 static int md_alloc(dev_t dev
, char *name
)
4810 static DEFINE_MUTEX(disks_mutex
);
4811 struct mddev
*mddev
= mddev_find(dev
);
4812 struct gendisk
*disk
;
4821 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4822 shift
= partitioned
? MdpMinorShift
: 0;
4823 unit
= MINOR(mddev
->unit
) >> shift
;
4825 /* wait for any previous instance of this device to be
4826 * completely removed (mddev_delayed_delete).
4828 flush_workqueue(md_misc_wq
);
4830 mutex_lock(&disks_mutex
);
4836 /* Need to ensure that 'name' is not a duplicate.
4838 struct mddev
*mddev2
;
4839 spin_lock(&all_mddevs_lock
);
4841 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4842 if (mddev2
->gendisk
&&
4843 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4844 spin_unlock(&all_mddevs_lock
);
4847 spin_unlock(&all_mddevs_lock
);
4851 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4854 mddev
->queue
->queuedata
= mddev
;
4856 blk_queue_make_request(mddev
->queue
, md_make_request
);
4857 blk_set_stacking_limits(&mddev
->queue
->limits
);
4859 disk
= alloc_disk(1 << shift
);
4861 blk_cleanup_queue(mddev
->queue
);
4862 mddev
->queue
= NULL
;
4865 disk
->major
= MAJOR(mddev
->unit
);
4866 disk
->first_minor
= unit
<< shift
;
4868 strcpy(disk
->disk_name
, name
);
4869 else if (partitioned
)
4870 sprintf(disk
->disk_name
, "md_d%d", unit
);
4872 sprintf(disk
->disk_name
, "md%d", unit
);
4873 disk
->fops
= &md_fops
;
4874 disk
->private_data
= mddev
;
4875 disk
->queue
= mddev
->queue
;
4876 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4877 /* Allow extended partitions. This makes the
4878 * 'mdp' device redundant, but we can't really
4881 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4882 mddev
->gendisk
= disk
;
4883 /* As soon as we call add_disk(), another thread could get
4884 * through to md_open, so make sure it doesn't get too far
4886 mutex_lock(&mddev
->open_mutex
);
4889 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4890 &disk_to_dev(disk
)->kobj
, "%s", "md");
4892 /* This isn't possible, but as kobject_init_and_add is marked
4893 * __must_check, we must do something with the result
4895 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4899 if (mddev
->kobj
.sd
&&
4900 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4901 printk(KERN_DEBUG
"pointless warning\n");
4902 mutex_unlock(&mddev
->open_mutex
);
4904 mutex_unlock(&disks_mutex
);
4905 if (!error
&& mddev
->kobj
.sd
) {
4906 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4907 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4913 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4915 md_alloc(dev
, NULL
);
4919 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4921 /* val must be "md_*" where * is not all digits.
4922 * We allocate an array with a large free minor number, and
4923 * set the name to val. val must not already be an active name.
4925 int len
= strlen(val
);
4926 char buf
[DISK_NAME_LEN
];
4928 while (len
&& val
[len
-1] == '\n')
4930 if (len
>= DISK_NAME_LEN
)
4932 strlcpy(buf
, val
, len
+1);
4933 if (strncmp(buf
, "md_", 3) != 0)
4935 return md_alloc(0, buf
);
4938 static void md_safemode_timeout(unsigned long data
)
4940 struct mddev
*mddev
= (struct mddev
*) data
;
4942 if (!atomic_read(&mddev
->writes_pending
)) {
4943 mddev
->safemode
= 1;
4944 if (mddev
->external
)
4945 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4947 md_wakeup_thread(mddev
->thread
);
4950 static int start_dirty_degraded
;
4952 int md_run(struct mddev
*mddev
)
4955 struct md_rdev
*rdev
;
4956 struct md_personality
*pers
;
4958 if (list_empty(&mddev
->disks
))
4959 /* cannot run an array with no devices.. */
4964 /* Cannot run until previous stop completes properly */
4965 if (mddev
->sysfs_active
)
4969 * Analyze all RAID superblock(s)
4971 if (!mddev
->raid_disks
) {
4972 if (!mddev
->persistent
)
4977 if (mddev
->level
!= LEVEL_NONE
)
4978 request_module("md-level-%d", mddev
->level
);
4979 else if (mddev
->clevel
[0])
4980 request_module("md-%s", mddev
->clevel
);
4983 * Drop all container device buffers, from now on
4984 * the only valid external interface is through the md
4987 rdev_for_each(rdev
, mddev
) {
4988 if (test_bit(Faulty
, &rdev
->flags
))
4990 sync_blockdev(rdev
->bdev
);
4991 invalidate_bdev(rdev
->bdev
);
4993 /* perform some consistency tests on the device.
4994 * We don't want the data to overlap the metadata,
4995 * Internal Bitmap issues have been handled elsewhere.
4997 if (rdev
->meta_bdev
) {
4998 /* Nothing to check */;
4999 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5000 if (mddev
->dev_sectors
&&
5001 rdev
->data_offset
+ mddev
->dev_sectors
5003 printk("md: %s: data overlaps metadata\n",
5008 if (rdev
->sb_start
+ rdev
->sb_size
/512
5009 > rdev
->data_offset
) {
5010 printk("md: %s: metadata overlaps data\n",
5015 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5018 if (mddev
->bio_set
== NULL
)
5019 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5021 spin_lock(&pers_lock
);
5022 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5023 if (!pers
|| !try_module_get(pers
->owner
)) {
5024 spin_unlock(&pers_lock
);
5025 if (mddev
->level
!= LEVEL_NONE
)
5026 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5029 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5033 spin_unlock(&pers_lock
);
5034 if (mddev
->level
!= pers
->level
) {
5035 mddev
->level
= pers
->level
;
5036 mddev
->new_level
= pers
->level
;
5038 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5040 if (mddev
->reshape_position
!= MaxSector
&&
5041 pers
->start_reshape
== NULL
) {
5042 /* This personality cannot handle reshaping... */
5043 module_put(pers
->owner
);
5047 if (pers
->sync_request
) {
5048 /* Warn if this is a potentially silly
5051 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5052 struct md_rdev
*rdev2
;
5055 rdev_for_each(rdev
, mddev
)
5056 rdev_for_each(rdev2
, mddev
) {
5058 rdev
->bdev
->bd_contains
==
5059 rdev2
->bdev
->bd_contains
) {
5061 "%s: WARNING: %s appears to be"
5062 " on the same physical disk as"
5065 bdevname(rdev
->bdev
,b
),
5066 bdevname(rdev2
->bdev
,b2
));
5073 "True protection against single-disk"
5074 " failure might be compromised.\n");
5077 mddev
->recovery
= 0;
5078 /* may be over-ridden by personality */
5079 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5081 mddev
->ok_start_degraded
= start_dirty_degraded
;
5083 if (start_readonly
&& mddev
->ro
== 0)
5084 mddev
->ro
= 2; /* read-only, but switch on first write */
5086 err
= pers
->run(mddev
);
5088 printk(KERN_ERR
"md: pers->run() failed ...\n");
5089 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5090 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5091 " but 'external_size' not in effect?\n", __func__
);
5093 "md: invalid array_size %llu > default size %llu\n",
5094 (unsigned long long)mddev
->array_sectors
/ 2,
5095 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5098 if (err
== 0 && pers
->sync_request
&&
5099 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5100 struct bitmap
*bitmap
;
5102 bitmap
= bitmap_create(mddev
, -1);
5103 if (IS_ERR(bitmap
)) {
5104 err
= PTR_ERR(bitmap
);
5105 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5106 mdname(mddev
), err
);
5108 mddev
->bitmap
= bitmap
;
5112 mddev_detach(mddev
);
5113 pers
->free(mddev
, mddev
->private);
5114 module_put(pers
->owner
);
5115 bitmap_destroy(mddev
);
5119 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5120 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5121 blk_queue_merge_bvec(mddev
->queue
, md_mergeable_bvec
);
5123 if (pers
->sync_request
) {
5124 if (mddev
->kobj
.sd
&&
5125 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5127 "md: cannot register extra attributes for %s\n",
5129 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5130 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5133 atomic_set(&mddev
->writes_pending
,0);
5134 atomic_set(&mddev
->max_corr_read_errors
,
5135 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5136 mddev
->safemode
= 0;
5137 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5138 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5139 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5142 spin_lock(&mddev
->lock
);
5145 spin_unlock(&mddev
->lock
);
5146 rdev_for_each(rdev
, mddev
)
5147 if (rdev
->raid_disk
>= 0)
5148 if (sysfs_link_rdev(mddev
, rdev
))
5149 /* failure here is OK */;
5151 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5153 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5154 md_update_sb(mddev
, 0);
5156 md_new_event(mddev
);
5157 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5158 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5159 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5162 EXPORT_SYMBOL_GPL(md_run
);
5164 static int do_md_run(struct mddev
*mddev
)
5168 err
= md_run(mddev
);
5171 err
= bitmap_load(mddev
);
5173 bitmap_destroy(mddev
);
5177 md_wakeup_thread(mddev
->thread
);
5178 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5180 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5181 revalidate_disk(mddev
->gendisk
);
5183 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5188 static int restart_array(struct mddev
*mddev
)
5190 struct gendisk
*disk
= mddev
->gendisk
;
5192 /* Complain if it has no devices */
5193 if (list_empty(&mddev
->disks
))
5199 mddev
->safemode
= 0;
5201 set_disk_ro(disk
, 0);
5202 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5204 /* Kick recovery or resync if necessary */
5205 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5206 md_wakeup_thread(mddev
->thread
);
5207 md_wakeup_thread(mddev
->sync_thread
);
5208 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5212 static void md_clean(struct mddev
*mddev
)
5214 mddev
->array_sectors
= 0;
5215 mddev
->external_size
= 0;
5216 mddev
->dev_sectors
= 0;
5217 mddev
->raid_disks
= 0;
5218 mddev
->recovery_cp
= 0;
5219 mddev
->resync_min
= 0;
5220 mddev
->resync_max
= MaxSector
;
5221 mddev
->reshape_position
= MaxSector
;
5222 mddev
->external
= 0;
5223 mddev
->persistent
= 0;
5224 mddev
->level
= LEVEL_NONE
;
5225 mddev
->clevel
[0] = 0;
5228 mddev
->metadata_type
[0] = 0;
5229 mddev
->chunk_sectors
= 0;
5230 mddev
->ctime
= mddev
->utime
= 0;
5232 mddev
->max_disks
= 0;
5234 mddev
->can_decrease_events
= 0;
5235 mddev
->delta_disks
= 0;
5236 mddev
->reshape_backwards
= 0;
5237 mddev
->new_level
= LEVEL_NONE
;
5238 mddev
->new_layout
= 0;
5239 mddev
->new_chunk_sectors
= 0;
5240 mddev
->curr_resync
= 0;
5241 atomic64_set(&mddev
->resync_mismatches
, 0);
5242 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5243 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5244 mddev
->recovery
= 0;
5247 mddev
->degraded
= 0;
5248 mddev
->safemode
= 0;
5249 mddev
->merge_check_needed
= 0;
5250 mddev
->bitmap_info
.offset
= 0;
5251 mddev
->bitmap_info
.default_offset
= 0;
5252 mddev
->bitmap_info
.default_space
= 0;
5253 mddev
->bitmap_info
.chunksize
= 0;
5254 mddev
->bitmap_info
.daemon_sleep
= 0;
5255 mddev
->bitmap_info
.max_write_behind
= 0;
5258 static void __md_stop_writes(struct mddev
*mddev
)
5260 if (mddev_is_clustered(mddev
))
5261 md_cluster_ops
->metadata_update_start(mddev
);
5262 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5263 flush_workqueue(md_misc_wq
);
5264 if (mddev
->sync_thread
) {
5265 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5266 md_reap_sync_thread(mddev
);
5269 del_timer_sync(&mddev
->safemode_timer
);
5271 bitmap_flush(mddev
);
5272 md_super_wait(mddev
);
5274 if (mddev
->ro
== 0 &&
5275 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5276 /* mark array as shutdown cleanly */
5278 md_update_sb(mddev
, 1);
5280 if (mddev_is_clustered(mddev
))
5281 md_cluster_ops
->metadata_update_finish(mddev
);
5284 void md_stop_writes(struct mddev
*mddev
)
5286 mddev_lock_nointr(mddev
);
5287 __md_stop_writes(mddev
);
5288 mddev_unlock(mddev
);
5290 EXPORT_SYMBOL_GPL(md_stop_writes
);
5292 static void mddev_detach(struct mddev
*mddev
)
5294 struct bitmap
*bitmap
= mddev
->bitmap
;
5295 /* wait for behind writes to complete */
5296 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5297 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5299 /* need to kick something here to make sure I/O goes? */
5300 wait_event(bitmap
->behind_wait
,
5301 atomic_read(&bitmap
->behind_writes
) == 0);
5303 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5304 mddev
->pers
->quiesce(mddev
, 1);
5305 mddev
->pers
->quiesce(mddev
, 0);
5307 md_unregister_thread(&mddev
->thread
);
5309 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5312 static void __md_stop(struct mddev
*mddev
)
5314 struct md_personality
*pers
= mddev
->pers
;
5315 mddev_detach(mddev
);
5316 spin_lock(&mddev
->lock
);
5319 spin_unlock(&mddev
->lock
);
5320 pers
->free(mddev
, mddev
->private);
5321 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5322 mddev
->to_remove
= &md_redundancy_group
;
5323 module_put(pers
->owner
);
5324 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5327 void md_stop(struct mddev
*mddev
)
5329 /* stop the array and free an attached data structures.
5330 * This is called from dm-raid
5333 bitmap_destroy(mddev
);
5335 bioset_free(mddev
->bio_set
);
5338 EXPORT_SYMBOL_GPL(md_stop
);
5340 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5345 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5347 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5348 md_wakeup_thread(mddev
->thread
);
5350 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5351 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5352 if (mddev
->sync_thread
)
5353 /* Thread might be blocked waiting for metadata update
5354 * which will now never happen */
5355 wake_up_process(mddev
->sync_thread
->tsk
);
5357 mddev_unlock(mddev
);
5358 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5360 mddev_lock_nointr(mddev
);
5362 mutex_lock(&mddev
->open_mutex
);
5363 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5364 mddev
->sync_thread
||
5365 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5366 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5367 printk("md: %s still in use.\n",mdname(mddev
));
5369 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5370 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5371 md_wakeup_thread(mddev
->thread
);
5377 __md_stop_writes(mddev
);
5383 set_disk_ro(mddev
->gendisk
, 1);
5384 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5385 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5386 md_wakeup_thread(mddev
->thread
);
5387 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5391 mutex_unlock(&mddev
->open_mutex
);
5396 * 0 - completely stop and dis-assemble array
5397 * 2 - stop but do not disassemble array
5399 static int do_md_stop(struct mddev
*mddev
, int mode
,
5400 struct block_device
*bdev
)
5402 struct gendisk
*disk
= mddev
->gendisk
;
5403 struct md_rdev
*rdev
;
5406 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5408 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5409 md_wakeup_thread(mddev
->thread
);
5411 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5412 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5413 if (mddev
->sync_thread
)
5414 /* Thread might be blocked waiting for metadata update
5415 * which will now never happen */
5416 wake_up_process(mddev
->sync_thread
->tsk
);
5418 mddev_unlock(mddev
);
5419 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5420 !test_bit(MD_RECOVERY_RUNNING
,
5421 &mddev
->recovery
)));
5422 mddev_lock_nointr(mddev
);
5424 mutex_lock(&mddev
->open_mutex
);
5425 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5426 mddev
->sysfs_active
||
5427 mddev
->sync_thread
||
5428 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5429 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5430 printk("md: %s still in use.\n",mdname(mddev
));
5431 mutex_unlock(&mddev
->open_mutex
);
5433 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5434 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5435 md_wakeup_thread(mddev
->thread
);
5441 set_disk_ro(disk
, 0);
5443 __md_stop_writes(mddev
);
5445 mddev
->queue
->merge_bvec_fn
= NULL
;
5446 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5448 /* tell userspace to handle 'inactive' */
5449 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5451 rdev_for_each(rdev
, mddev
)
5452 if (rdev
->raid_disk
>= 0)
5453 sysfs_unlink_rdev(mddev
, rdev
);
5455 set_capacity(disk
, 0);
5456 mutex_unlock(&mddev
->open_mutex
);
5458 revalidate_disk(disk
);
5463 mutex_unlock(&mddev
->open_mutex
);
5465 * Free resources if final stop
5468 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5470 bitmap_destroy(mddev
);
5471 if (mddev
->bitmap_info
.file
) {
5472 struct file
*f
= mddev
->bitmap_info
.file
;
5473 spin_lock(&mddev
->lock
);
5474 mddev
->bitmap_info
.file
= NULL
;
5475 spin_unlock(&mddev
->lock
);
5478 mddev
->bitmap_info
.offset
= 0;
5480 export_array(mddev
);
5483 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5484 if (mddev
->hold_active
== UNTIL_STOP
)
5485 mddev
->hold_active
= 0;
5487 blk_integrity_unregister(disk
);
5488 md_new_event(mddev
);
5489 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5494 static void autorun_array(struct mddev
*mddev
)
5496 struct md_rdev
*rdev
;
5499 if (list_empty(&mddev
->disks
))
5502 printk(KERN_INFO
"md: running: ");
5504 rdev_for_each(rdev
, mddev
) {
5505 char b
[BDEVNAME_SIZE
];
5506 printk("<%s>", bdevname(rdev
->bdev
,b
));
5510 err
= do_md_run(mddev
);
5512 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5513 do_md_stop(mddev
, 0, NULL
);
5518 * lets try to run arrays based on all disks that have arrived
5519 * until now. (those are in pending_raid_disks)
5521 * the method: pick the first pending disk, collect all disks with
5522 * the same UUID, remove all from the pending list and put them into
5523 * the 'same_array' list. Then order this list based on superblock
5524 * update time (freshest comes first), kick out 'old' disks and
5525 * compare superblocks. If everything's fine then run it.
5527 * If "unit" is allocated, then bump its reference count
5529 static void autorun_devices(int part
)
5531 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5532 struct mddev
*mddev
;
5533 char b
[BDEVNAME_SIZE
];
5535 printk(KERN_INFO
"md: autorun ...\n");
5536 while (!list_empty(&pending_raid_disks
)) {
5539 LIST_HEAD(candidates
);
5540 rdev0
= list_entry(pending_raid_disks
.next
,
5541 struct md_rdev
, same_set
);
5543 printk(KERN_INFO
"md: considering %s ...\n",
5544 bdevname(rdev0
->bdev
,b
));
5545 INIT_LIST_HEAD(&candidates
);
5546 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5547 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5548 printk(KERN_INFO
"md: adding %s ...\n",
5549 bdevname(rdev
->bdev
,b
));
5550 list_move(&rdev
->same_set
, &candidates
);
5553 * now we have a set of devices, with all of them having
5554 * mostly sane superblocks. It's time to allocate the
5558 dev
= MKDEV(mdp_major
,
5559 rdev0
->preferred_minor
<< MdpMinorShift
);
5560 unit
= MINOR(dev
) >> MdpMinorShift
;
5562 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5565 if (rdev0
->preferred_minor
!= unit
) {
5566 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5567 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5571 md_probe(dev
, NULL
, NULL
);
5572 mddev
= mddev_find(dev
);
5573 if (!mddev
|| !mddev
->gendisk
) {
5577 "md: cannot allocate memory for md drive.\n");
5580 if (mddev_lock(mddev
))
5581 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5583 else if (mddev
->raid_disks
|| mddev
->major_version
5584 || !list_empty(&mddev
->disks
)) {
5586 "md: %s already running, cannot run %s\n",
5587 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5588 mddev_unlock(mddev
);
5590 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5591 mddev
->persistent
= 1;
5592 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5593 list_del_init(&rdev
->same_set
);
5594 if (bind_rdev_to_array(rdev
, mddev
))
5597 autorun_array(mddev
);
5598 mddev_unlock(mddev
);
5600 /* on success, candidates will be empty, on error
5603 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5604 list_del_init(&rdev
->same_set
);
5609 printk(KERN_INFO
"md: ... autorun DONE.\n");
5611 #endif /* !MODULE */
5613 static int get_version(void __user
*arg
)
5617 ver
.major
= MD_MAJOR_VERSION
;
5618 ver
.minor
= MD_MINOR_VERSION
;
5619 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5621 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5627 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5629 mdu_array_info_t info
;
5630 int nr
,working
,insync
,failed
,spare
;
5631 struct md_rdev
*rdev
;
5633 nr
= working
= insync
= failed
= spare
= 0;
5635 rdev_for_each_rcu(rdev
, mddev
) {
5637 if (test_bit(Faulty
, &rdev
->flags
))
5641 if (test_bit(In_sync
, &rdev
->flags
))
5649 info
.major_version
= mddev
->major_version
;
5650 info
.minor_version
= mddev
->minor_version
;
5651 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5652 info
.ctime
= mddev
->ctime
;
5653 info
.level
= mddev
->level
;
5654 info
.size
= mddev
->dev_sectors
/ 2;
5655 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5658 info
.raid_disks
= mddev
->raid_disks
;
5659 info
.md_minor
= mddev
->md_minor
;
5660 info
.not_persistent
= !mddev
->persistent
;
5662 info
.utime
= mddev
->utime
;
5665 info
.state
= (1<<MD_SB_CLEAN
);
5666 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5667 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5668 if (mddev_is_clustered(mddev
))
5669 info
.state
|= (1<<MD_SB_CLUSTERED
);
5670 info
.active_disks
= insync
;
5671 info
.working_disks
= working
;
5672 info
.failed_disks
= failed
;
5673 info
.spare_disks
= spare
;
5675 info
.layout
= mddev
->layout
;
5676 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5678 if (copy_to_user(arg
, &info
, sizeof(info
)))
5684 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5686 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5690 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5695 spin_lock(&mddev
->lock
);
5696 /* bitmap disabled, zero the first byte and copy out */
5697 if (!mddev
->bitmap_info
.file
)
5698 file
->pathname
[0] = '\0';
5699 else if ((ptr
= d_path(&mddev
->bitmap_info
.file
->f_path
,
5700 file
->pathname
, sizeof(file
->pathname
))),
5704 memmove(file
->pathname
, ptr
,
5705 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5706 spin_unlock(&mddev
->lock
);
5709 copy_to_user(arg
, file
, sizeof(*file
)))
5716 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5718 mdu_disk_info_t info
;
5719 struct md_rdev
*rdev
;
5721 if (copy_from_user(&info
, arg
, sizeof(info
)))
5725 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5727 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5728 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5729 info
.raid_disk
= rdev
->raid_disk
;
5731 if (test_bit(Faulty
, &rdev
->flags
))
5732 info
.state
|= (1<<MD_DISK_FAULTY
);
5733 else if (test_bit(In_sync
, &rdev
->flags
)) {
5734 info
.state
|= (1<<MD_DISK_ACTIVE
);
5735 info
.state
|= (1<<MD_DISK_SYNC
);
5737 if (test_bit(WriteMostly
, &rdev
->flags
))
5738 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5740 info
.major
= info
.minor
= 0;
5741 info
.raid_disk
= -1;
5742 info
.state
= (1<<MD_DISK_REMOVED
);
5746 if (copy_to_user(arg
, &info
, sizeof(info
)))
5752 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5754 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5755 struct md_rdev
*rdev
;
5756 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5758 if (mddev_is_clustered(mddev
) &&
5759 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5760 pr_err("%s: Cannot add to clustered mddev.\n",
5765 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5768 if (!mddev
->raid_disks
) {
5770 /* expecting a device which has a superblock */
5771 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5774 "md: md_import_device returned %ld\n",
5776 return PTR_ERR(rdev
);
5778 if (!list_empty(&mddev
->disks
)) {
5779 struct md_rdev
*rdev0
5780 = list_entry(mddev
->disks
.next
,
5781 struct md_rdev
, same_set
);
5782 err
= super_types
[mddev
->major_version
]
5783 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5786 "md: %s has different UUID to %s\n",
5787 bdevname(rdev
->bdev
,b
),
5788 bdevname(rdev0
->bdev
,b2
));
5793 err
= bind_rdev_to_array(rdev
, mddev
);
5800 * add_new_disk can be used once the array is assembled
5801 * to add "hot spares". They must already have a superblock
5806 if (!mddev
->pers
->hot_add_disk
) {
5808 "%s: personality does not support diskops!\n",
5812 if (mddev
->persistent
)
5813 rdev
= md_import_device(dev
, mddev
->major_version
,
5814 mddev
->minor_version
);
5816 rdev
= md_import_device(dev
, -1, -1);
5819 "md: md_import_device returned %ld\n",
5821 return PTR_ERR(rdev
);
5823 /* set saved_raid_disk if appropriate */
5824 if (!mddev
->persistent
) {
5825 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5826 info
->raid_disk
< mddev
->raid_disks
) {
5827 rdev
->raid_disk
= info
->raid_disk
;
5828 set_bit(In_sync
, &rdev
->flags
);
5829 clear_bit(Bitmap_sync
, &rdev
->flags
);
5831 rdev
->raid_disk
= -1;
5832 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5834 super_types
[mddev
->major_version
].
5835 validate_super(mddev
, rdev
);
5836 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5837 rdev
->raid_disk
!= info
->raid_disk
) {
5838 /* This was a hot-add request, but events doesn't
5839 * match, so reject it.
5845 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5846 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5847 set_bit(WriteMostly
, &rdev
->flags
);
5849 clear_bit(WriteMostly
, &rdev
->flags
);
5852 * check whether the device shows up in other nodes
5854 if (mddev_is_clustered(mddev
)) {
5855 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
5856 /* Through --cluster-confirm */
5857 set_bit(Candidate
, &rdev
->flags
);
5858 err
= md_cluster_ops
->new_disk_ack(mddev
, true);
5863 } else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
5864 /* --add initiated by this node */
5865 err
= md_cluster_ops
->add_new_disk_start(mddev
, rdev
);
5867 md_cluster_ops
->add_new_disk_finish(mddev
);
5874 rdev
->raid_disk
= -1;
5875 err
= bind_rdev_to_array(rdev
, mddev
);
5876 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5877 /* If there is hot_add_disk but no hot_remove_disk
5878 * then added disks for geometry changes,
5879 * and should be added immediately.
5881 super_types
[mddev
->major_version
].
5882 validate_super(mddev
, rdev
);
5883 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5885 unbind_rdev_from_array(rdev
);
5890 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5892 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5893 if (mddev
->degraded
)
5894 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5895 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5897 md_new_event(mddev
);
5898 md_wakeup_thread(mddev
->thread
);
5899 if (mddev_is_clustered(mddev
) &&
5900 (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)))
5901 md_cluster_ops
->add_new_disk_finish(mddev
);
5905 /* otherwise, add_new_disk is only allowed
5906 * for major_version==0 superblocks
5908 if (mddev
->major_version
!= 0) {
5909 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5914 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5916 rdev
= md_import_device(dev
, -1, 0);
5919 "md: error, md_import_device() returned %ld\n",
5921 return PTR_ERR(rdev
);
5923 rdev
->desc_nr
= info
->number
;
5924 if (info
->raid_disk
< mddev
->raid_disks
)
5925 rdev
->raid_disk
= info
->raid_disk
;
5927 rdev
->raid_disk
= -1;
5929 if (rdev
->raid_disk
< mddev
->raid_disks
)
5930 if (info
->state
& (1<<MD_DISK_SYNC
))
5931 set_bit(In_sync
, &rdev
->flags
);
5933 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5934 set_bit(WriteMostly
, &rdev
->flags
);
5936 if (!mddev
->persistent
) {
5937 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5938 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5940 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5941 rdev
->sectors
= rdev
->sb_start
;
5943 err
= bind_rdev_to_array(rdev
, mddev
);
5953 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5955 char b
[BDEVNAME_SIZE
];
5956 struct md_rdev
*rdev
;
5958 rdev
= find_rdev(mddev
, dev
);
5962 if (mddev_is_clustered(mddev
))
5963 md_cluster_ops
->metadata_update_start(mddev
);
5965 clear_bit(Blocked
, &rdev
->flags
);
5966 remove_and_add_spares(mddev
, rdev
);
5968 if (rdev
->raid_disk
>= 0)
5971 md_kick_rdev_from_array(rdev
);
5972 md_update_sb(mddev
, 1);
5973 md_new_event(mddev
);
5975 if (mddev_is_clustered(mddev
))
5976 md_cluster_ops
->metadata_update_finish(mddev
);
5980 if (mddev_is_clustered(mddev
))
5981 md_cluster_ops
->metadata_update_cancel(mddev
);
5982 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5983 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5987 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5989 char b
[BDEVNAME_SIZE
];
5991 struct md_rdev
*rdev
;
5996 if (mddev
->major_version
!= 0) {
5997 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5998 " version-0 superblocks.\n",
6002 if (!mddev
->pers
->hot_add_disk
) {
6004 "%s: personality does not support diskops!\n",
6009 rdev
= md_import_device(dev
, -1, 0);
6012 "md: error, md_import_device() returned %ld\n",
6017 if (mddev
->persistent
)
6018 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6020 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6022 rdev
->sectors
= rdev
->sb_start
;
6024 if (test_bit(Faulty
, &rdev
->flags
)) {
6026 "md: can not hot-add faulty %s disk to %s!\n",
6027 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6032 if (mddev_is_clustered(mddev
))
6033 md_cluster_ops
->metadata_update_start(mddev
);
6034 clear_bit(In_sync
, &rdev
->flags
);
6036 rdev
->saved_raid_disk
= -1;
6037 err
= bind_rdev_to_array(rdev
, mddev
);
6039 goto abort_clustered
;
6042 * The rest should better be atomic, we can have disk failures
6043 * noticed in interrupt contexts ...
6046 rdev
->raid_disk
= -1;
6048 md_update_sb(mddev
, 1);
6050 if (mddev_is_clustered(mddev
))
6051 md_cluster_ops
->metadata_update_finish(mddev
);
6053 * Kick recovery, maybe this spare has to be added to the
6054 * array immediately.
6056 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6057 md_wakeup_thread(mddev
->thread
);
6058 md_new_event(mddev
);
6062 if (mddev_is_clustered(mddev
))
6063 md_cluster_ops
->metadata_update_cancel(mddev
);
6069 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6074 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6076 if (mddev
->recovery
|| mddev
->sync_thread
)
6078 /* we should be able to change the bitmap.. */
6082 struct inode
*inode
;
6085 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6086 return -EEXIST
; /* cannot add when bitmap is present */
6090 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6095 inode
= f
->f_mapping
->host
;
6096 if (!S_ISREG(inode
->i_mode
)) {
6097 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6100 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6101 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6104 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6105 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6113 mddev
->bitmap_info
.file
= f
;
6114 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6115 } else if (mddev
->bitmap
== NULL
)
6116 return -ENOENT
; /* cannot remove what isn't there */
6119 mddev
->pers
->quiesce(mddev
, 1);
6121 struct bitmap
*bitmap
;
6123 bitmap
= bitmap_create(mddev
, -1);
6124 if (!IS_ERR(bitmap
)) {
6125 mddev
->bitmap
= bitmap
;
6126 err
= bitmap_load(mddev
);
6128 err
= PTR_ERR(bitmap
);
6130 if (fd
< 0 || err
) {
6131 bitmap_destroy(mddev
);
6132 fd
= -1; /* make sure to put the file */
6134 mddev
->pers
->quiesce(mddev
, 0);
6137 struct file
*f
= mddev
->bitmap_info
.file
;
6139 spin_lock(&mddev
->lock
);
6140 mddev
->bitmap_info
.file
= NULL
;
6141 spin_unlock(&mddev
->lock
);
6150 * set_array_info is used two different ways
6151 * The original usage is when creating a new array.
6152 * In this usage, raid_disks is > 0 and it together with
6153 * level, size, not_persistent,layout,chunksize determine the
6154 * shape of the array.
6155 * This will always create an array with a type-0.90.0 superblock.
6156 * The newer usage is when assembling an array.
6157 * In this case raid_disks will be 0, and the major_version field is
6158 * use to determine which style super-blocks are to be found on the devices.
6159 * The minor and patch _version numbers are also kept incase the
6160 * super_block handler wishes to interpret them.
6162 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6165 if (info
->raid_disks
== 0) {
6166 /* just setting version number for superblock loading */
6167 if (info
->major_version
< 0 ||
6168 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6169 super_types
[info
->major_version
].name
== NULL
) {
6170 /* maybe try to auto-load a module? */
6172 "md: superblock version %d not known\n",
6173 info
->major_version
);
6176 mddev
->major_version
= info
->major_version
;
6177 mddev
->minor_version
= info
->minor_version
;
6178 mddev
->patch_version
= info
->patch_version
;
6179 mddev
->persistent
= !info
->not_persistent
;
6180 /* ensure mddev_put doesn't delete this now that there
6181 * is some minimal configuration.
6183 mddev
->ctime
= get_seconds();
6186 mddev
->major_version
= MD_MAJOR_VERSION
;
6187 mddev
->minor_version
= MD_MINOR_VERSION
;
6188 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6189 mddev
->ctime
= get_seconds();
6191 mddev
->level
= info
->level
;
6192 mddev
->clevel
[0] = 0;
6193 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6194 mddev
->raid_disks
= info
->raid_disks
;
6195 /* don't set md_minor, it is determined by which /dev/md* was
6198 if (info
->state
& (1<<MD_SB_CLEAN
))
6199 mddev
->recovery_cp
= MaxSector
;
6201 mddev
->recovery_cp
= 0;
6202 mddev
->persistent
= ! info
->not_persistent
;
6203 mddev
->external
= 0;
6205 mddev
->layout
= info
->layout
;
6206 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6208 mddev
->max_disks
= MD_SB_DISKS
;
6210 if (mddev
->persistent
)
6212 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6214 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6215 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6216 mddev
->bitmap_info
.offset
= 0;
6218 mddev
->reshape_position
= MaxSector
;
6221 * Generate a 128 bit UUID
6223 get_random_bytes(mddev
->uuid
, 16);
6225 mddev
->new_level
= mddev
->level
;
6226 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6227 mddev
->new_layout
= mddev
->layout
;
6228 mddev
->delta_disks
= 0;
6229 mddev
->reshape_backwards
= 0;
6234 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6236 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6238 if (mddev
->external_size
)
6241 mddev
->array_sectors
= array_sectors
;
6243 EXPORT_SYMBOL(md_set_array_sectors
);
6245 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6247 struct md_rdev
*rdev
;
6249 int fit
= (num_sectors
== 0);
6251 if (mddev
->pers
->resize
== NULL
)
6253 /* The "num_sectors" is the number of sectors of each device that
6254 * is used. This can only make sense for arrays with redundancy.
6255 * linear and raid0 always use whatever space is available. We can only
6256 * consider changing this number if no resync or reconstruction is
6257 * happening, and if the new size is acceptable. It must fit before the
6258 * sb_start or, if that is <data_offset, it must fit before the size
6259 * of each device. If num_sectors is zero, we find the largest size
6262 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6268 rdev_for_each(rdev
, mddev
) {
6269 sector_t avail
= rdev
->sectors
;
6271 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6272 num_sectors
= avail
;
6273 if (avail
< num_sectors
)
6276 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6278 revalidate_disk(mddev
->gendisk
);
6282 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6285 struct md_rdev
*rdev
;
6286 /* change the number of raid disks */
6287 if (mddev
->pers
->check_reshape
== NULL
)
6291 if (raid_disks
<= 0 ||
6292 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6294 if (mddev
->sync_thread
||
6295 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6296 mddev
->reshape_position
!= MaxSector
)
6299 rdev_for_each(rdev
, mddev
) {
6300 if (mddev
->raid_disks
< raid_disks
&&
6301 rdev
->data_offset
< rdev
->new_data_offset
)
6303 if (mddev
->raid_disks
> raid_disks
&&
6304 rdev
->data_offset
> rdev
->new_data_offset
)
6308 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6309 if (mddev
->delta_disks
< 0)
6310 mddev
->reshape_backwards
= 1;
6311 else if (mddev
->delta_disks
> 0)
6312 mddev
->reshape_backwards
= 0;
6314 rv
= mddev
->pers
->check_reshape(mddev
);
6316 mddev
->delta_disks
= 0;
6317 mddev
->reshape_backwards
= 0;
6323 * update_array_info is used to change the configuration of an
6325 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6326 * fields in the info are checked against the array.
6327 * Any differences that cannot be handled will cause an error.
6328 * Normally, only one change can be managed at a time.
6330 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6336 /* calculate expected state,ignoring low bits */
6337 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6338 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6340 if (mddev
->major_version
!= info
->major_version
||
6341 mddev
->minor_version
!= info
->minor_version
||
6342 /* mddev->patch_version != info->patch_version || */
6343 mddev
->ctime
!= info
->ctime
||
6344 mddev
->level
!= info
->level
||
6345 /* mddev->layout != info->layout || */
6346 !mddev
->persistent
!= info
->not_persistent
||
6347 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6348 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6349 ((state
^info
->state
) & 0xfffffe00)
6352 /* Check there is only one change */
6353 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6355 if (mddev
->raid_disks
!= info
->raid_disks
)
6357 if (mddev
->layout
!= info
->layout
)
6359 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6366 if (mddev
->layout
!= info
->layout
) {
6368 * we don't need to do anything at the md level, the
6369 * personality will take care of it all.
6371 if (mddev
->pers
->check_reshape
== NULL
)
6374 mddev
->new_layout
= info
->layout
;
6375 rv
= mddev
->pers
->check_reshape(mddev
);
6377 mddev
->new_layout
= mddev
->layout
;
6381 if (mddev_is_clustered(mddev
))
6382 md_cluster_ops
->metadata_update_start(mddev
);
6383 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6384 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6386 if (mddev
->raid_disks
!= info
->raid_disks
)
6387 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6389 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6390 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6394 if (mddev
->recovery
|| mddev
->sync_thread
) {
6398 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6399 struct bitmap
*bitmap
;
6400 /* add the bitmap */
6401 if (mddev
->bitmap
) {
6405 if (mddev
->bitmap_info
.default_offset
== 0) {
6409 mddev
->bitmap_info
.offset
=
6410 mddev
->bitmap_info
.default_offset
;
6411 mddev
->bitmap_info
.space
=
6412 mddev
->bitmap_info
.default_space
;
6413 mddev
->pers
->quiesce(mddev
, 1);
6414 bitmap
= bitmap_create(mddev
, -1);
6415 if (!IS_ERR(bitmap
)) {
6416 mddev
->bitmap
= bitmap
;
6417 rv
= bitmap_load(mddev
);
6419 rv
= PTR_ERR(bitmap
);
6421 bitmap_destroy(mddev
);
6422 mddev
->pers
->quiesce(mddev
, 0);
6424 /* remove the bitmap */
6425 if (!mddev
->bitmap
) {
6429 if (mddev
->bitmap
->storage
.file
) {
6433 mddev
->pers
->quiesce(mddev
, 1);
6434 bitmap_destroy(mddev
);
6435 mddev
->pers
->quiesce(mddev
, 0);
6436 mddev
->bitmap_info
.offset
= 0;
6439 md_update_sb(mddev
, 1);
6440 if (mddev_is_clustered(mddev
))
6441 md_cluster_ops
->metadata_update_finish(mddev
);
6444 if (mddev_is_clustered(mddev
))
6445 md_cluster_ops
->metadata_update_cancel(mddev
);
6449 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6451 struct md_rdev
*rdev
;
6454 if (mddev
->pers
== NULL
)
6458 rdev
= find_rdev_rcu(mddev
, dev
);
6462 md_error(mddev
, rdev
);
6463 if (!test_bit(Faulty
, &rdev
->flags
))
6471 * We have a problem here : there is no easy way to give a CHS
6472 * virtual geometry. We currently pretend that we have a 2 heads
6473 * 4 sectors (with a BIG number of cylinders...). This drives
6474 * dosfs just mad... ;-)
6476 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6478 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6482 geo
->cylinders
= mddev
->array_sectors
/ 8;
6486 static inline bool md_ioctl_valid(unsigned int cmd
)
6491 case GET_ARRAY_INFO
:
6492 case GET_BITMAP_FILE
:
6495 case HOT_REMOVE_DISK
:
6498 case RESTART_ARRAY_RW
:
6500 case SET_ARRAY_INFO
:
6501 case SET_BITMAP_FILE
:
6502 case SET_DISK_FAULTY
:
6505 case CLUSTERED_DISK_NACK
:
6512 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6513 unsigned int cmd
, unsigned long arg
)
6516 void __user
*argp
= (void __user
*)arg
;
6517 struct mddev
*mddev
= NULL
;
6520 if (!md_ioctl_valid(cmd
))
6525 case GET_ARRAY_INFO
:
6529 if (!capable(CAP_SYS_ADMIN
))
6534 * Commands dealing with the RAID driver but not any
6539 err
= get_version(argp
);
6545 autostart_arrays(arg
);
6552 * Commands creating/starting a new array:
6555 mddev
= bdev
->bd_disk
->private_data
;
6562 /* Some actions do not requires the mutex */
6564 case GET_ARRAY_INFO
:
6565 if (!mddev
->raid_disks
&& !mddev
->external
)
6568 err
= get_array_info(mddev
, argp
);
6572 if (!mddev
->raid_disks
&& !mddev
->external
)
6575 err
= get_disk_info(mddev
, argp
);
6578 case SET_DISK_FAULTY
:
6579 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6582 case GET_BITMAP_FILE
:
6583 err
= get_bitmap_file(mddev
, argp
);
6588 if (cmd
== ADD_NEW_DISK
)
6589 /* need to ensure md_delayed_delete() has completed */
6590 flush_workqueue(md_misc_wq
);
6592 if (cmd
== HOT_REMOVE_DISK
)
6593 /* need to ensure recovery thread has run */
6594 wait_event_interruptible_timeout(mddev
->sb_wait
,
6595 !test_bit(MD_RECOVERY_NEEDED
,
6597 msecs_to_jiffies(5000));
6598 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6599 /* Need to flush page cache, and ensure no-one else opens
6602 mutex_lock(&mddev
->open_mutex
);
6603 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6604 mutex_unlock(&mddev
->open_mutex
);
6608 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6609 mutex_unlock(&mddev
->open_mutex
);
6610 sync_blockdev(bdev
);
6612 err
= mddev_lock(mddev
);
6615 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6620 if (cmd
== SET_ARRAY_INFO
) {
6621 mdu_array_info_t info
;
6623 memset(&info
, 0, sizeof(info
));
6624 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6629 err
= update_array_info(mddev
, &info
);
6631 printk(KERN_WARNING
"md: couldn't update"
6632 " array info. %d\n", err
);
6637 if (!list_empty(&mddev
->disks
)) {
6639 "md: array %s already has disks!\n",
6644 if (mddev
->raid_disks
) {
6646 "md: array %s already initialised!\n",
6651 err
= set_array_info(mddev
, &info
);
6653 printk(KERN_WARNING
"md: couldn't set"
6654 " array info. %d\n", err
);
6661 * Commands querying/configuring an existing array:
6663 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6664 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6665 if ((!mddev
->raid_disks
&& !mddev
->external
)
6666 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6667 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6668 && cmd
!= GET_BITMAP_FILE
) {
6674 * Commands even a read-only array can execute:
6677 case RESTART_ARRAY_RW
:
6678 err
= restart_array(mddev
);
6682 err
= do_md_stop(mddev
, 0, bdev
);
6686 err
= md_set_readonly(mddev
, bdev
);
6689 case HOT_REMOVE_DISK
:
6690 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6694 /* We can support ADD_NEW_DISK on read-only arrays
6695 * on if we are re-adding a preexisting device.
6696 * So require mddev->pers and MD_DISK_SYNC.
6699 mdu_disk_info_t info
;
6700 if (copy_from_user(&info
, argp
, sizeof(info
)))
6702 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6703 /* Need to clear read-only for this */
6706 err
= add_new_disk(mddev
, &info
);
6712 if (get_user(ro
, (int __user
*)(arg
))) {
6718 /* if the bdev is going readonly the value of mddev->ro
6719 * does not matter, no writes are coming
6724 /* are we are already prepared for writes? */
6728 /* transitioning to readauto need only happen for
6729 * arrays that call md_write_start
6732 err
= restart_array(mddev
);
6735 set_disk_ro(mddev
->gendisk
, 0);
6742 * The remaining ioctls are changing the state of the
6743 * superblock, so we do not allow them on read-only arrays.
6745 if (mddev
->ro
&& mddev
->pers
) {
6746 if (mddev
->ro
== 2) {
6748 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6749 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6750 /* mddev_unlock will wake thread */
6751 /* If a device failed while we were read-only, we
6752 * need to make sure the metadata is updated now.
6754 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6755 mddev_unlock(mddev
);
6756 wait_event(mddev
->sb_wait
,
6757 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6758 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6759 mddev_lock_nointr(mddev
);
6770 mdu_disk_info_t info
;
6771 if (copy_from_user(&info
, argp
, sizeof(info
)))
6774 err
= add_new_disk(mddev
, &info
);
6778 case CLUSTERED_DISK_NACK
:
6779 if (mddev_is_clustered(mddev
))
6780 md_cluster_ops
->new_disk_ack(mddev
, false);
6786 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6790 err
= do_md_run(mddev
);
6793 case SET_BITMAP_FILE
:
6794 err
= set_bitmap_file(mddev
, (int)arg
);
6803 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6805 mddev
->hold_active
= 0;
6806 mddev_unlock(mddev
);
6810 #ifdef CONFIG_COMPAT
6811 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6812 unsigned int cmd
, unsigned long arg
)
6815 case HOT_REMOVE_DISK
:
6817 case SET_DISK_FAULTY
:
6818 case SET_BITMAP_FILE
:
6819 /* These take in integer arg, do not convert */
6822 arg
= (unsigned long)compat_ptr(arg
);
6826 return md_ioctl(bdev
, mode
, cmd
, arg
);
6828 #endif /* CONFIG_COMPAT */
6830 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6833 * Succeed if we can lock the mddev, which confirms that
6834 * it isn't being stopped right now.
6836 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6842 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6843 /* we are racing with mddev_put which is discarding this
6847 /* Wait until bdev->bd_disk is definitely gone */
6848 flush_workqueue(md_misc_wq
);
6849 /* Then retry the open from the top */
6850 return -ERESTARTSYS
;
6852 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6854 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6858 atomic_inc(&mddev
->openers
);
6859 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6860 mutex_unlock(&mddev
->open_mutex
);
6862 check_disk_change(bdev
);
6867 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6869 struct mddev
*mddev
= disk
->private_data
;
6872 atomic_dec(&mddev
->openers
);
6876 static int md_media_changed(struct gendisk
*disk
)
6878 struct mddev
*mddev
= disk
->private_data
;
6880 return mddev
->changed
;
6883 static int md_revalidate(struct gendisk
*disk
)
6885 struct mddev
*mddev
= disk
->private_data
;
6890 static const struct block_device_operations md_fops
=
6892 .owner
= THIS_MODULE
,
6894 .release
= md_release
,
6896 #ifdef CONFIG_COMPAT
6897 .compat_ioctl
= md_compat_ioctl
,
6899 .getgeo
= md_getgeo
,
6900 .media_changed
= md_media_changed
,
6901 .revalidate_disk
= md_revalidate
,
6904 static int md_thread(void *arg
)
6906 struct md_thread
*thread
= arg
;
6909 * md_thread is a 'system-thread', it's priority should be very
6910 * high. We avoid resource deadlocks individually in each
6911 * raid personality. (RAID5 does preallocation) We also use RR and
6912 * the very same RT priority as kswapd, thus we will never get
6913 * into a priority inversion deadlock.
6915 * we definitely have to have equal or higher priority than
6916 * bdflush, otherwise bdflush will deadlock if there are too
6917 * many dirty RAID5 blocks.
6920 allow_signal(SIGKILL
);
6921 while (!kthread_should_stop()) {
6923 /* We need to wait INTERRUPTIBLE so that
6924 * we don't add to the load-average.
6925 * That means we need to be sure no signals are
6928 if (signal_pending(current
))
6929 flush_signals(current
);
6931 wait_event_interruptible_timeout
6933 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6934 || kthread_should_stop(),
6937 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6938 if (!kthread_should_stop())
6939 thread
->run(thread
);
6945 void md_wakeup_thread(struct md_thread
*thread
)
6948 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6949 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6950 wake_up(&thread
->wqueue
);
6953 EXPORT_SYMBOL(md_wakeup_thread
);
6955 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6956 struct mddev
*mddev
, const char *name
)
6958 struct md_thread
*thread
;
6960 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6964 init_waitqueue_head(&thread
->wqueue
);
6967 thread
->mddev
= mddev
;
6968 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6969 thread
->tsk
= kthread_run(md_thread
, thread
,
6971 mdname(thread
->mddev
),
6973 if (IS_ERR(thread
->tsk
)) {
6979 EXPORT_SYMBOL(md_register_thread
);
6981 void md_unregister_thread(struct md_thread
**threadp
)
6983 struct md_thread
*thread
= *threadp
;
6986 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6987 /* Locking ensures that mddev_unlock does not wake_up a
6988 * non-existent thread
6990 spin_lock(&pers_lock
);
6992 spin_unlock(&pers_lock
);
6994 kthread_stop(thread
->tsk
);
6997 EXPORT_SYMBOL(md_unregister_thread
);
6999 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7001 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7004 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7006 mddev
->pers
->error_handler(mddev
,rdev
);
7007 if (mddev
->degraded
)
7008 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7009 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7010 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7011 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7012 md_wakeup_thread(mddev
->thread
);
7013 if (mddev
->event_work
.func
)
7014 queue_work(md_misc_wq
, &mddev
->event_work
);
7015 md_new_event_inintr(mddev
);
7017 EXPORT_SYMBOL(md_error
);
7019 /* seq_file implementation /proc/mdstat */
7021 static void status_unused(struct seq_file
*seq
)
7024 struct md_rdev
*rdev
;
7026 seq_printf(seq
, "unused devices: ");
7028 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7029 char b
[BDEVNAME_SIZE
];
7031 seq_printf(seq
, "%s ",
7032 bdevname(rdev
->bdev
,b
));
7035 seq_printf(seq
, "<none>");
7037 seq_printf(seq
, "\n");
7040 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7042 sector_t max_sectors
, resync
, res
;
7043 unsigned long dt
, db
;
7046 unsigned int per_milli
;
7048 if (mddev
->curr_resync
<= 3)
7051 resync
= mddev
->curr_resync
7052 - atomic_read(&mddev
->recovery_active
);
7054 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7055 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7056 max_sectors
= mddev
->resync_max_sectors
;
7058 max_sectors
= mddev
->dev_sectors
;
7060 WARN_ON(max_sectors
== 0);
7061 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7062 * in a sector_t, and (max_sectors>>scale) will fit in a
7063 * u32, as those are the requirements for sector_div.
7064 * Thus 'scale' must be at least 10
7067 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7068 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7071 res
= (resync
>>scale
)*1000;
7072 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7076 int i
, x
= per_milli
/50, y
= 20-x
;
7077 seq_printf(seq
, "[");
7078 for (i
= 0; i
< x
; i
++)
7079 seq_printf(seq
, "=");
7080 seq_printf(seq
, ">");
7081 for (i
= 0; i
< y
; i
++)
7082 seq_printf(seq
, ".");
7083 seq_printf(seq
, "] ");
7085 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7086 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7088 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7090 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7091 "resync" : "recovery"))),
7092 per_milli
/10, per_milli
% 10,
7093 (unsigned long long) resync
/2,
7094 (unsigned long long) max_sectors
/2);
7097 * dt: time from mark until now
7098 * db: blocks written from mark until now
7099 * rt: remaining time
7101 * rt is a sector_t, so could be 32bit or 64bit.
7102 * So we divide before multiply in case it is 32bit and close
7104 * We scale the divisor (db) by 32 to avoid losing precision
7105 * near the end of resync when the number of remaining sectors
7107 * We then divide rt by 32 after multiplying by db to compensate.
7108 * The '+1' avoids division by zero if db is very small.
7110 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7112 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7113 - mddev
->resync_mark_cnt
;
7115 rt
= max_sectors
- resync
; /* number of remaining sectors */
7116 sector_div(rt
, db
/32+1);
7120 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7121 ((unsigned long)rt
% 60)/6);
7123 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7126 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7128 struct list_head
*tmp
;
7130 struct mddev
*mddev
;
7138 spin_lock(&all_mddevs_lock
);
7139 list_for_each(tmp
,&all_mddevs
)
7141 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7143 spin_unlock(&all_mddevs_lock
);
7146 spin_unlock(&all_mddevs_lock
);
7148 return (void*)2;/* tail */
7152 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7154 struct list_head
*tmp
;
7155 struct mddev
*next_mddev
, *mddev
= v
;
7161 spin_lock(&all_mddevs_lock
);
7163 tmp
= all_mddevs
.next
;
7165 tmp
= mddev
->all_mddevs
.next
;
7166 if (tmp
!= &all_mddevs
)
7167 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7169 next_mddev
= (void*)2;
7172 spin_unlock(&all_mddevs_lock
);
7180 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7182 struct mddev
*mddev
= v
;
7184 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7188 static int md_seq_show(struct seq_file
*seq
, void *v
)
7190 struct mddev
*mddev
= v
;
7192 struct md_rdev
*rdev
;
7194 if (v
== (void*)1) {
7195 struct md_personality
*pers
;
7196 seq_printf(seq
, "Personalities : ");
7197 spin_lock(&pers_lock
);
7198 list_for_each_entry(pers
, &pers_list
, list
)
7199 seq_printf(seq
, "[%s] ", pers
->name
);
7201 spin_unlock(&pers_lock
);
7202 seq_printf(seq
, "\n");
7203 seq
->poll_event
= atomic_read(&md_event_count
);
7206 if (v
== (void*)2) {
7211 spin_lock(&mddev
->lock
);
7212 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7213 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7214 mddev
->pers
? "" : "in");
7217 seq_printf(seq
, " (read-only)");
7219 seq_printf(seq
, " (auto-read-only)");
7220 seq_printf(seq
, " %s", mddev
->pers
->name
);
7225 rdev_for_each_rcu(rdev
, mddev
) {
7226 char b
[BDEVNAME_SIZE
];
7227 seq_printf(seq
, " %s[%d]",
7228 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7229 if (test_bit(WriteMostly
, &rdev
->flags
))
7230 seq_printf(seq
, "(W)");
7231 if (test_bit(Faulty
, &rdev
->flags
)) {
7232 seq_printf(seq
, "(F)");
7235 if (rdev
->raid_disk
< 0)
7236 seq_printf(seq
, "(S)"); /* spare */
7237 if (test_bit(Replacement
, &rdev
->flags
))
7238 seq_printf(seq
, "(R)");
7239 sectors
+= rdev
->sectors
;
7243 if (!list_empty(&mddev
->disks
)) {
7245 seq_printf(seq
, "\n %llu blocks",
7246 (unsigned long long)
7247 mddev
->array_sectors
/ 2);
7249 seq_printf(seq
, "\n %llu blocks",
7250 (unsigned long long)sectors
/ 2);
7252 if (mddev
->persistent
) {
7253 if (mddev
->major_version
!= 0 ||
7254 mddev
->minor_version
!= 90) {
7255 seq_printf(seq
," super %d.%d",
7256 mddev
->major_version
,
7257 mddev
->minor_version
);
7259 } else if (mddev
->external
)
7260 seq_printf(seq
, " super external:%s",
7261 mddev
->metadata_type
);
7263 seq_printf(seq
, " super non-persistent");
7266 mddev
->pers
->status(seq
, mddev
);
7267 seq_printf(seq
, "\n ");
7268 if (mddev
->pers
->sync_request
) {
7269 if (mddev
->curr_resync
> 2) {
7270 status_resync(seq
, mddev
);
7271 seq_printf(seq
, "\n ");
7272 } else if (mddev
->curr_resync
>= 1)
7273 seq_printf(seq
, "\tresync=DELAYED\n ");
7274 else if (mddev
->recovery_cp
< MaxSector
)
7275 seq_printf(seq
, "\tresync=PENDING\n ");
7278 seq_printf(seq
, "\n ");
7280 bitmap_status(seq
, mddev
->bitmap
);
7282 seq_printf(seq
, "\n");
7284 spin_unlock(&mddev
->lock
);
7289 static const struct seq_operations md_seq_ops
= {
7290 .start
= md_seq_start
,
7291 .next
= md_seq_next
,
7292 .stop
= md_seq_stop
,
7293 .show
= md_seq_show
,
7296 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7298 struct seq_file
*seq
;
7301 error
= seq_open(file
, &md_seq_ops
);
7305 seq
= file
->private_data
;
7306 seq
->poll_event
= atomic_read(&md_event_count
);
7310 static int md_unloading
;
7311 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7313 struct seq_file
*seq
= filp
->private_data
;
7317 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7318 poll_wait(filp
, &md_event_waiters
, wait
);
7320 /* always allow read */
7321 mask
= POLLIN
| POLLRDNORM
;
7323 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7324 mask
|= POLLERR
| POLLPRI
;
7328 static const struct file_operations md_seq_fops
= {
7329 .owner
= THIS_MODULE
,
7330 .open
= md_seq_open
,
7332 .llseek
= seq_lseek
,
7333 .release
= seq_release_private
,
7334 .poll
= mdstat_poll
,
7337 int register_md_personality(struct md_personality
*p
)
7339 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7341 spin_lock(&pers_lock
);
7342 list_add_tail(&p
->list
, &pers_list
);
7343 spin_unlock(&pers_lock
);
7346 EXPORT_SYMBOL(register_md_personality
);
7348 int unregister_md_personality(struct md_personality
*p
)
7350 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7351 spin_lock(&pers_lock
);
7352 list_del_init(&p
->list
);
7353 spin_unlock(&pers_lock
);
7356 EXPORT_SYMBOL(unregister_md_personality
);
7358 int register_md_cluster_operations(struct md_cluster_operations
*ops
, struct module
*module
)
7360 if (md_cluster_ops
!= NULL
)
7362 spin_lock(&pers_lock
);
7363 md_cluster_ops
= ops
;
7364 md_cluster_mod
= module
;
7365 spin_unlock(&pers_lock
);
7368 EXPORT_SYMBOL(register_md_cluster_operations
);
7370 int unregister_md_cluster_operations(void)
7372 spin_lock(&pers_lock
);
7373 md_cluster_ops
= NULL
;
7374 spin_unlock(&pers_lock
);
7377 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7379 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7383 err
= request_module("md-cluster");
7385 pr_err("md-cluster module not found.\n");
7389 spin_lock(&pers_lock
);
7390 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7391 spin_unlock(&pers_lock
);
7394 spin_unlock(&pers_lock
);
7396 return md_cluster_ops
->join(mddev
, nodes
);
7399 void md_cluster_stop(struct mddev
*mddev
)
7401 if (!md_cluster_ops
)
7403 md_cluster_ops
->leave(mddev
);
7404 module_put(md_cluster_mod
);
7407 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7409 struct md_rdev
*rdev
;
7415 rdev_for_each_rcu(rdev
, mddev
) {
7416 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7417 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7418 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7419 atomic_read(&disk
->sync_io
);
7420 /* sync IO will cause sync_io to increase before the disk_stats
7421 * as sync_io is counted when a request starts, and
7422 * disk_stats is counted when it completes.
7423 * So resync activity will cause curr_events to be smaller than
7424 * when there was no such activity.
7425 * non-sync IO will cause disk_stat to increase without
7426 * increasing sync_io so curr_events will (eventually)
7427 * be larger than it was before. Once it becomes
7428 * substantially larger, the test below will cause
7429 * the array to appear non-idle, and resync will slow
7431 * If there is a lot of outstanding resync activity when
7432 * we set last_event to curr_events, then all that activity
7433 * completing might cause the array to appear non-idle
7434 * and resync will be slowed down even though there might
7435 * not have been non-resync activity. This will only
7436 * happen once though. 'last_events' will soon reflect
7437 * the state where there is little or no outstanding
7438 * resync requests, and further resync activity will
7439 * always make curr_events less than last_events.
7442 if (init
|| curr_events
- rdev
->last_events
> 64) {
7443 rdev
->last_events
= curr_events
;
7451 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7453 /* another "blocks" (512byte) blocks have been synced */
7454 atomic_sub(blocks
, &mddev
->recovery_active
);
7455 wake_up(&mddev
->recovery_wait
);
7457 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7458 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7459 md_wakeup_thread(mddev
->thread
);
7460 // stop recovery, signal do_sync ....
7463 EXPORT_SYMBOL(md_done_sync
);
7465 /* md_write_start(mddev, bi)
7466 * If we need to update some array metadata (e.g. 'active' flag
7467 * in superblock) before writing, schedule a superblock update
7468 * and wait for it to complete.
7470 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7473 if (bio_data_dir(bi
) != WRITE
)
7476 BUG_ON(mddev
->ro
== 1);
7477 if (mddev
->ro
== 2) {
7478 /* need to switch to read/write */
7480 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7481 md_wakeup_thread(mddev
->thread
);
7482 md_wakeup_thread(mddev
->sync_thread
);
7485 atomic_inc(&mddev
->writes_pending
);
7486 if (mddev
->safemode
== 1)
7487 mddev
->safemode
= 0;
7488 if (mddev
->in_sync
) {
7489 spin_lock(&mddev
->lock
);
7490 if (mddev
->in_sync
) {
7492 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7493 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7494 md_wakeup_thread(mddev
->thread
);
7497 spin_unlock(&mddev
->lock
);
7500 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7501 wait_event(mddev
->sb_wait
,
7502 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7504 EXPORT_SYMBOL(md_write_start
);
7506 void md_write_end(struct mddev
*mddev
)
7508 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7509 if (mddev
->safemode
== 2)
7510 md_wakeup_thread(mddev
->thread
);
7511 else if (mddev
->safemode_delay
)
7512 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7515 EXPORT_SYMBOL(md_write_end
);
7517 /* md_allow_write(mddev)
7518 * Calling this ensures that the array is marked 'active' so that writes
7519 * may proceed without blocking. It is important to call this before
7520 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7521 * Must be called with mddev_lock held.
7523 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7524 * is dropped, so return -EAGAIN after notifying userspace.
7526 int md_allow_write(struct mddev
*mddev
)
7532 if (!mddev
->pers
->sync_request
)
7535 spin_lock(&mddev
->lock
);
7536 if (mddev
->in_sync
) {
7538 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7539 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7540 if (mddev
->safemode_delay
&&
7541 mddev
->safemode
== 0)
7542 mddev
->safemode
= 1;
7543 spin_unlock(&mddev
->lock
);
7544 if (mddev_is_clustered(mddev
))
7545 md_cluster_ops
->metadata_update_start(mddev
);
7546 md_update_sb(mddev
, 0);
7547 if (mddev_is_clustered(mddev
))
7548 md_cluster_ops
->metadata_update_finish(mddev
);
7549 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7551 spin_unlock(&mddev
->lock
);
7553 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7558 EXPORT_SYMBOL_GPL(md_allow_write
);
7560 #define SYNC_MARKS 10
7561 #define SYNC_MARK_STEP (3*HZ)
7562 #define UPDATE_FREQUENCY (5*60*HZ)
7563 void md_do_sync(struct md_thread
*thread
)
7565 struct mddev
*mddev
= thread
->mddev
;
7566 struct mddev
*mddev2
;
7567 unsigned int currspeed
= 0,
7569 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7570 unsigned long mark
[SYNC_MARKS
];
7571 unsigned long update_time
;
7572 sector_t mark_cnt
[SYNC_MARKS
];
7574 struct list_head
*tmp
;
7575 sector_t last_check
;
7577 struct md_rdev
*rdev
;
7578 char *desc
, *action
= NULL
;
7579 struct blk_plug plug
;
7581 /* just incase thread restarts... */
7582 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7584 if (mddev
->ro
) {/* never try to sync a read-only array */
7585 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7589 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7590 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7591 desc
= "data-check";
7593 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7594 desc
= "requested-resync";
7598 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7603 mddev
->last_sync_action
= action
?: desc
;
7605 /* we overload curr_resync somewhat here.
7606 * 0 == not engaged in resync at all
7607 * 2 == checking that there is no conflict with another sync
7608 * 1 == like 2, but have yielded to allow conflicting resync to
7610 * other == active in resync - this many blocks
7612 * Before starting a resync we must have set curr_resync to
7613 * 2, and then checked that every "conflicting" array has curr_resync
7614 * less than ours. When we find one that is the same or higher
7615 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7616 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7617 * This will mean we have to start checking from the beginning again.
7622 mddev
->curr_resync
= 2;
7625 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7627 for_each_mddev(mddev2
, tmp
) {
7628 if (mddev2
== mddev
)
7630 if (!mddev
->parallel_resync
7631 && mddev2
->curr_resync
7632 && match_mddev_units(mddev
, mddev2
)) {
7634 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7635 /* arbitrarily yield */
7636 mddev
->curr_resync
= 1;
7637 wake_up(&resync_wait
);
7639 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7640 /* no need to wait here, we can wait the next
7641 * time 'round when curr_resync == 2
7644 /* We need to wait 'interruptible' so as not to
7645 * contribute to the load average, and not to
7646 * be caught by 'softlockup'
7648 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7649 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7650 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7651 printk(KERN_INFO
"md: delaying %s of %s"
7652 " until %s has finished (they"
7653 " share one or more physical units)\n",
7654 desc
, mdname(mddev
), mdname(mddev2
));
7656 if (signal_pending(current
))
7657 flush_signals(current
);
7659 finish_wait(&resync_wait
, &wq
);
7662 finish_wait(&resync_wait
, &wq
);
7665 } while (mddev
->curr_resync
< 2);
7668 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7669 /* resync follows the size requested by the personality,
7670 * which defaults to physical size, but can be virtual size
7672 max_sectors
= mddev
->resync_max_sectors
;
7673 atomic64_set(&mddev
->resync_mismatches
, 0);
7674 /* we don't use the checkpoint if there's a bitmap */
7675 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7676 j
= mddev
->resync_min
;
7677 else if (!mddev
->bitmap
)
7678 j
= mddev
->recovery_cp
;
7680 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7681 max_sectors
= mddev
->resync_max_sectors
;
7683 /* recovery follows the physical size of devices */
7684 max_sectors
= mddev
->dev_sectors
;
7687 rdev_for_each_rcu(rdev
, mddev
)
7688 if (rdev
->raid_disk
>= 0 &&
7689 !test_bit(Faulty
, &rdev
->flags
) &&
7690 !test_bit(In_sync
, &rdev
->flags
) &&
7691 rdev
->recovery_offset
< j
)
7692 j
= rdev
->recovery_offset
;
7695 /* If there is a bitmap, we need to make sure all
7696 * writes that started before we added a spare
7697 * complete before we start doing a recovery.
7698 * Otherwise the write might complete and (via
7699 * bitmap_endwrite) set a bit in the bitmap after the
7700 * recovery has checked that bit and skipped that
7703 if (mddev
->bitmap
) {
7704 mddev
->pers
->quiesce(mddev
, 1);
7705 mddev
->pers
->quiesce(mddev
, 0);
7709 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7710 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7711 " %d KB/sec/disk.\n", speed_min(mddev
));
7712 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7713 "(but not more than %d KB/sec) for %s.\n",
7714 speed_max(mddev
), desc
);
7716 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7719 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7721 mark_cnt
[m
] = io_sectors
;
7724 mddev
->resync_mark
= mark
[last_mark
];
7725 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7728 * Tune reconstruction:
7730 window
= 32*(PAGE_SIZE
/512);
7731 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7732 window
/2, (unsigned long long)max_sectors
/2);
7734 atomic_set(&mddev
->recovery_active
, 0);
7739 "md: resuming %s of %s from checkpoint.\n",
7740 desc
, mdname(mddev
));
7741 mddev
->curr_resync
= j
;
7743 mddev
->curr_resync
= 3; /* no longer delayed */
7744 mddev
->curr_resync_completed
= j
;
7745 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7746 md_new_event(mddev
);
7747 update_time
= jiffies
;
7749 if (mddev_is_clustered(mddev
))
7750 md_cluster_ops
->resync_start(mddev
, j
, max_sectors
);
7752 blk_start_plug(&plug
);
7753 while (j
< max_sectors
) {
7758 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7759 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7760 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7761 > (max_sectors
>> 4)) ||
7762 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7763 (j
- mddev
->curr_resync_completed
)*2
7764 >= mddev
->resync_max
- mddev
->curr_resync_completed
7766 /* time to update curr_resync_completed */
7767 wait_event(mddev
->recovery_wait
,
7768 atomic_read(&mddev
->recovery_active
) == 0);
7769 mddev
->curr_resync_completed
= j
;
7770 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7771 j
> mddev
->recovery_cp
)
7772 mddev
->recovery_cp
= j
;
7773 update_time
= jiffies
;
7774 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7775 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7778 while (j
>= mddev
->resync_max
&&
7779 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7780 /* As this condition is controlled by user-space,
7781 * we can block indefinitely, so use '_interruptible'
7782 * to avoid triggering warnings.
7784 flush_signals(current
); /* just in case */
7785 wait_event_interruptible(mddev
->recovery_wait
,
7786 mddev
->resync_max
> j
7787 || test_bit(MD_RECOVERY_INTR
,
7791 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7794 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7795 currspeed
< speed_min(mddev
));
7797 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7801 if (!skipped
) { /* actual IO requested */
7802 io_sectors
+= sectors
;
7803 atomic_add(sectors
, &mddev
->recovery_active
);
7806 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7811 mddev
->curr_resync
= j
;
7812 if (mddev_is_clustered(mddev
))
7813 md_cluster_ops
->resync_info_update(mddev
, j
, max_sectors
);
7814 mddev
->curr_mark_cnt
= io_sectors
;
7815 if (last_check
== 0)
7816 /* this is the earliest that rebuild will be
7817 * visible in /proc/mdstat
7819 md_new_event(mddev
);
7821 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7824 last_check
= io_sectors
;
7826 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7828 int next
= (last_mark
+1) % SYNC_MARKS
;
7830 mddev
->resync_mark
= mark
[next
];
7831 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7832 mark
[next
] = jiffies
;
7833 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7837 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7841 * this loop exits only if either when we are slower than
7842 * the 'hard' speed limit, or the system was IO-idle for
7844 * the system might be non-idle CPU-wise, but we only care
7845 * about not overloading the IO subsystem. (things like an
7846 * e2fsck being done on the RAID array should execute fast)
7850 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7851 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7852 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7854 if (currspeed
> speed_min(mddev
)) {
7855 if ((currspeed
> speed_max(mddev
)) ||
7856 !is_mddev_idle(mddev
, 0)) {
7862 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7863 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7864 ? "interrupted" : "done");
7866 * this also signals 'finished resyncing' to md_stop
7868 blk_finish_plug(&plug
);
7869 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7871 /* tell personality that we are finished */
7872 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7874 if (mddev_is_clustered(mddev
))
7875 md_cluster_ops
->resync_finish(mddev
);
7877 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7878 mddev
->curr_resync
> 2) {
7879 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7880 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7881 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7883 "md: checkpointing %s of %s.\n",
7884 desc
, mdname(mddev
));
7885 if (test_bit(MD_RECOVERY_ERROR
,
7887 mddev
->recovery_cp
=
7888 mddev
->curr_resync_completed
;
7890 mddev
->recovery_cp
=
7894 mddev
->recovery_cp
= MaxSector
;
7896 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7897 mddev
->curr_resync
= MaxSector
;
7899 rdev_for_each_rcu(rdev
, mddev
)
7900 if (rdev
->raid_disk
>= 0 &&
7901 mddev
->delta_disks
>= 0 &&
7902 !test_bit(Faulty
, &rdev
->flags
) &&
7903 !test_bit(In_sync
, &rdev
->flags
) &&
7904 rdev
->recovery_offset
< mddev
->curr_resync
)
7905 rdev
->recovery_offset
= mddev
->curr_resync
;
7910 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7912 spin_lock(&mddev
->lock
);
7913 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7914 /* We completed so min/max setting can be forgotten if used. */
7915 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7916 mddev
->resync_min
= 0;
7917 mddev
->resync_max
= MaxSector
;
7918 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7919 mddev
->resync_min
= mddev
->curr_resync_completed
;
7920 mddev
->curr_resync
= 0;
7921 spin_unlock(&mddev
->lock
);
7923 wake_up(&resync_wait
);
7924 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7925 md_wakeup_thread(mddev
->thread
);
7928 EXPORT_SYMBOL_GPL(md_do_sync
);
7930 static int remove_and_add_spares(struct mddev
*mddev
,
7931 struct md_rdev
*this)
7933 struct md_rdev
*rdev
;
7937 rdev_for_each(rdev
, mddev
)
7938 if ((this == NULL
|| rdev
== this) &&
7939 rdev
->raid_disk
>= 0 &&
7940 !test_bit(Blocked
, &rdev
->flags
) &&
7941 (test_bit(Faulty
, &rdev
->flags
) ||
7942 ! test_bit(In_sync
, &rdev
->flags
)) &&
7943 atomic_read(&rdev
->nr_pending
)==0) {
7944 if (mddev
->pers
->hot_remove_disk(
7945 mddev
, rdev
) == 0) {
7946 sysfs_unlink_rdev(mddev
, rdev
);
7947 rdev
->raid_disk
= -1;
7951 if (removed
&& mddev
->kobj
.sd
)
7952 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7957 rdev_for_each(rdev
, mddev
) {
7958 if (rdev
->raid_disk
>= 0 &&
7959 !test_bit(In_sync
, &rdev
->flags
) &&
7960 !test_bit(Faulty
, &rdev
->flags
))
7962 if (rdev
->raid_disk
>= 0)
7964 if (test_bit(Faulty
, &rdev
->flags
))
7967 ! (rdev
->saved_raid_disk
>= 0 &&
7968 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7971 if (rdev
->saved_raid_disk
< 0)
7972 rdev
->recovery_offset
= 0;
7974 hot_add_disk(mddev
, rdev
) == 0) {
7975 if (sysfs_link_rdev(mddev
, rdev
))
7976 /* failure here is OK */;
7978 md_new_event(mddev
);
7979 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7984 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7988 static void md_start_sync(struct work_struct
*ws
)
7990 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7992 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7995 if (!mddev
->sync_thread
) {
7996 printk(KERN_ERR
"%s: could not start resync"
7999 /* leave the spares where they are, it shouldn't hurt */
8000 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8001 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8002 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8003 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8004 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8005 wake_up(&resync_wait
);
8006 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8008 if (mddev
->sysfs_action
)
8009 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8011 md_wakeup_thread(mddev
->sync_thread
);
8012 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8013 md_new_event(mddev
);
8017 * This routine is regularly called by all per-raid-array threads to
8018 * deal with generic issues like resync and super-block update.
8019 * Raid personalities that don't have a thread (linear/raid0) do not
8020 * need this as they never do any recovery or update the superblock.
8022 * It does not do any resync itself, but rather "forks" off other threads
8023 * to do that as needed.
8024 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8025 * "->recovery" and create a thread at ->sync_thread.
8026 * When the thread finishes it sets MD_RECOVERY_DONE
8027 * and wakeups up this thread which will reap the thread and finish up.
8028 * This thread also removes any faulty devices (with nr_pending == 0).
8030 * The overall approach is:
8031 * 1/ if the superblock needs updating, update it.
8032 * 2/ If a recovery thread is running, don't do anything else.
8033 * 3/ If recovery has finished, clean up, possibly marking spares active.
8034 * 4/ If there are any faulty devices, remove them.
8035 * 5/ If array is degraded, try to add spares devices
8036 * 6/ If array has spares or is not in-sync, start a resync thread.
8038 void md_check_recovery(struct mddev
*mddev
)
8040 if (mddev
->suspended
)
8044 bitmap_daemon_work(mddev
);
8046 if (signal_pending(current
)) {
8047 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8048 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8050 mddev
->safemode
= 2;
8052 flush_signals(current
);
8055 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8058 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8059 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8060 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8061 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8062 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8063 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8067 if (mddev_trylock(mddev
)) {
8071 /* On a read-only array we can:
8072 * - remove failed devices
8073 * - add already-in_sync devices if the array itself
8075 * As we only add devices that are already in-sync,
8076 * we can activate the spares immediately.
8078 remove_and_add_spares(mddev
, NULL
);
8079 /* There is no thread, but we need to call
8080 * ->spare_active and clear saved_raid_disk
8082 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8083 md_reap_sync_thread(mddev
);
8084 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8088 if (!mddev
->external
) {
8090 spin_lock(&mddev
->lock
);
8091 if (mddev
->safemode
&&
8092 !atomic_read(&mddev
->writes_pending
) &&
8094 mddev
->recovery_cp
== MaxSector
) {
8097 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8099 if (mddev
->safemode
== 1)
8100 mddev
->safemode
= 0;
8101 spin_unlock(&mddev
->lock
);
8103 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8106 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
) {
8107 if (mddev_is_clustered(mddev
))
8108 md_cluster_ops
->metadata_update_start(mddev
);
8109 md_update_sb(mddev
, 0);
8110 if (mddev_is_clustered(mddev
))
8111 md_cluster_ops
->metadata_update_finish(mddev
);
8114 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8115 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8116 /* resync/recovery still happening */
8117 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8120 if (mddev
->sync_thread
) {
8121 md_reap_sync_thread(mddev
);
8124 /* Set RUNNING before clearing NEEDED to avoid
8125 * any transients in the value of "sync_action".
8127 mddev
->curr_resync_completed
= 0;
8128 spin_lock(&mddev
->lock
);
8129 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8130 spin_unlock(&mddev
->lock
);
8131 /* Clear some bits that don't mean anything, but
8134 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8135 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8137 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8138 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8140 /* no recovery is running.
8141 * remove any failed drives, then
8142 * add spares if possible.
8143 * Spares are also removed and re-added, to allow
8144 * the personality to fail the re-add.
8147 if (mddev
->reshape_position
!= MaxSector
) {
8148 if (mddev
->pers
->check_reshape
== NULL
||
8149 mddev
->pers
->check_reshape(mddev
) != 0)
8150 /* Cannot proceed */
8152 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8153 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8154 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8155 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8156 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8157 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8158 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8159 } else if (mddev
->recovery_cp
< MaxSector
) {
8160 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8161 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8162 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8163 /* nothing to be done ... */
8166 if (mddev
->pers
->sync_request
) {
8168 /* We are adding a device or devices to an array
8169 * which has the bitmap stored on all devices.
8170 * So make sure all bitmap pages get written
8172 bitmap_write_all(mddev
->bitmap
);
8174 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8175 queue_work(md_misc_wq
, &mddev
->del_work
);
8179 if (!mddev
->sync_thread
) {
8180 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8181 wake_up(&resync_wait
);
8182 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8184 if (mddev
->sysfs_action
)
8185 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8188 wake_up(&mddev
->sb_wait
);
8189 mddev_unlock(mddev
);
8192 EXPORT_SYMBOL(md_check_recovery
);
8194 void md_reap_sync_thread(struct mddev
*mddev
)
8196 struct md_rdev
*rdev
;
8198 /* resync has finished, collect result */
8199 md_unregister_thread(&mddev
->sync_thread
);
8200 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8201 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8203 /* activate any spares */
8204 if (mddev
->pers
->spare_active(mddev
)) {
8205 sysfs_notify(&mddev
->kobj
, NULL
,
8207 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8210 if (mddev_is_clustered(mddev
))
8211 md_cluster_ops
->metadata_update_start(mddev
);
8212 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8213 mddev
->pers
->finish_reshape
)
8214 mddev
->pers
->finish_reshape(mddev
);
8216 /* If array is no-longer degraded, then any saved_raid_disk
8217 * information must be scrapped.
8219 if (!mddev
->degraded
)
8220 rdev_for_each(rdev
, mddev
)
8221 rdev
->saved_raid_disk
= -1;
8223 md_update_sb(mddev
, 1);
8224 if (mddev_is_clustered(mddev
))
8225 md_cluster_ops
->metadata_update_finish(mddev
);
8226 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8227 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8228 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8229 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8230 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8231 wake_up(&resync_wait
);
8232 /* flag recovery needed just to double check */
8233 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8234 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8235 md_new_event(mddev
);
8236 if (mddev
->event_work
.func
)
8237 queue_work(md_misc_wq
, &mddev
->event_work
);
8239 EXPORT_SYMBOL(md_reap_sync_thread
);
8241 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8243 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8244 wait_event_timeout(rdev
->blocked_wait
,
8245 !test_bit(Blocked
, &rdev
->flags
) &&
8246 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8247 msecs_to_jiffies(5000));
8248 rdev_dec_pending(rdev
, mddev
);
8250 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8252 void md_finish_reshape(struct mddev
*mddev
)
8254 /* called be personality module when reshape completes. */
8255 struct md_rdev
*rdev
;
8257 rdev_for_each(rdev
, mddev
) {
8258 if (rdev
->data_offset
> rdev
->new_data_offset
)
8259 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8261 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8262 rdev
->data_offset
= rdev
->new_data_offset
;
8265 EXPORT_SYMBOL(md_finish_reshape
);
8267 /* Bad block management.
8268 * We can record which blocks on each device are 'bad' and so just
8269 * fail those blocks, or that stripe, rather than the whole device.
8270 * Entries in the bad-block table are 64bits wide. This comprises:
8271 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8272 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8273 * A 'shift' can be set so that larger blocks are tracked and
8274 * consequently larger devices can be covered.
8275 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8277 * Locking of the bad-block table uses a seqlock so md_is_badblock
8278 * might need to retry if it is very unlucky.
8279 * We will sometimes want to check for bad blocks in a bi_end_io function,
8280 * so we use the write_seqlock_irq variant.
8282 * When looking for a bad block we specify a range and want to
8283 * know if any block in the range is bad. So we binary-search
8284 * to the last range that starts at-or-before the given endpoint,
8285 * (or "before the sector after the target range")
8286 * then see if it ends after the given start.
8288 * 0 if there are no known bad blocks in the range
8289 * 1 if there are known bad block which are all acknowledged
8290 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8291 * plus the start/length of the first bad section we overlap.
8293 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8294 sector_t
*first_bad
, int *bad_sectors
)
8300 sector_t target
= s
+ sectors
;
8303 if (bb
->shift
> 0) {
8304 /* round the start down, and the end up */
8306 target
+= (1<<bb
->shift
) - 1;
8307 target
>>= bb
->shift
;
8308 sectors
= target
- s
;
8310 /* 'target' is now the first block after the bad range */
8313 seq
= read_seqbegin(&bb
->lock
);
8318 /* Binary search between lo and hi for 'target'
8319 * i.e. for the last range that starts before 'target'
8321 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8322 * are known not to be the last range before target.
8323 * VARIANT: hi-lo is the number of possible
8324 * ranges, and decreases until it reaches 1
8326 while (hi
- lo
> 1) {
8327 int mid
= (lo
+ hi
) / 2;
8328 sector_t a
= BB_OFFSET(p
[mid
]);
8330 /* This could still be the one, earlier ranges
8334 /* This and later ranges are definitely out. */
8337 /* 'lo' might be the last that started before target, but 'hi' isn't */
8339 /* need to check all range that end after 's' to see if
8340 * any are unacknowledged.
8343 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8344 if (BB_OFFSET(p
[lo
]) < target
) {
8345 /* starts before the end, and finishes after
8346 * the start, so they must overlap
8348 if (rv
!= -1 && BB_ACK(p
[lo
]))
8352 *first_bad
= BB_OFFSET(p
[lo
]);
8353 *bad_sectors
= BB_LEN(p
[lo
]);
8359 if (read_seqretry(&bb
->lock
, seq
))
8364 EXPORT_SYMBOL_GPL(md_is_badblock
);
8367 * Add a range of bad blocks to the table.
8368 * This might extend the table, or might contract it
8369 * if two adjacent ranges can be merged.
8370 * We binary-search to find the 'insertion' point, then
8371 * decide how best to handle it.
8373 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8379 unsigned long flags
;
8382 /* badblocks are disabled */
8386 /* round the start down, and the end up */
8387 sector_t next
= s
+ sectors
;
8389 next
+= (1<<bb
->shift
) - 1;
8394 write_seqlock_irqsave(&bb
->lock
, flags
);
8399 /* Find the last range that starts at-or-before 's' */
8400 while (hi
- lo
> 1) {
8401 int mid
= (lo
+ hi
) / 2;
8402 sector_t a
= BB_OFFSET(p
[mid
]);
8408 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8412 /* we found a range that might merge with the start
8415 sector_t a
= BB_OFFSET(p
[lo
]);
8416 sector_t e
= a
+ BB_LEN(p
[lo
]);
8417 int ack
= BB_ACK(p
[lo
]);
8419 /* Yes, we can merge with a previous range */
8420 if (s
== a
&& s
+ sectors
>= e
)
8421 /* new range covers old */
8424 ack
= ack
&& acknowledged
;
8426 if (e
< s
+ sectors
)
8428 if (e
- a
<= BB_MAX_LEN
) {
8429 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8432 /* does not all fit in one range,
8433 * make p[lo] maximal
8435 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8436 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8442 if (sectors
&& hi
< bb
->count
) {
8443 /* 'hi' points to the first range that starts after 's'.
8444 * Maybe we can merge with the start of that range */
8445 sector_t a
= BB_OFFSET(p
[hi
]);
8446 sector_t e
= a
+ BB_LEN(p
[hi
]);
8447 int ack
= BB_ACK(p
[hi
]);
8448 if (a
<= s
+ sectors
) {
8449 /* merging is possible */
8450 if (e
<= s
+ sectors
) {
8455 ack
= ack
&& acknowledged
;
8458 if (e
- a
<= BB_MAX_LEN
) {
8459 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8462 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8470 if (sectors
== 0 && hi
< bb
->count
) {
8471 /* we might be able to combine lo and hi */
8472 /* Note: 's' is at the end of 'lo' */
8473 sector_t a
= BB_OFFSET(p
[hi
]);
8474 int lolen
= BB_LEN(p
[lo
]);
8475 int hilen
= BB_LEN(p
[hi
]);
8476 int newlen
= lolen
+ hilen
- (s
- a
);
8477 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8478 /* yes, we can combine them */
8479 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8480 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8481 memmove(p
+ hi
, p
+ hi
+ 1,
8482 (bb
->count
- hi
- 1) * 8);
8487 /* didn't merge (it all).
8488 * Need to add a range just before 'hi' */
8489 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8490 /* No room for more */
8494 int this_sectors
= sectors
;
8495 memmove(p
+ hi
+ 1, p
+ hi
,
8496 (bb
->count
- hi
) * 8);
8499 if (this_sectors
> BB_MAX_LEN
)
8500 this_sectors
= BB_MAX_LEN
;
8501 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8502 sectors
-= this_sectors
;
8509 bb
->unacked_exist
= 1;
8510 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8515 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8520 s
+= rdev
->new_data_offset
;
8522 s
+= rdev
->data_offset
;
8523 rv
= md_set_badblocks(&rdev
->badblocks
,
8526 /* Make sure they get written out promptly */
8527 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8528 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8529 md_wakeup_thread(rdev
->mddev
->thread
);
8533 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8536 * Remove a range of bad blocks from the table.
8537 * This may involve extending the table if we spilt a region,
8538 * but it must not fail. So if the table becomes full, we just
8539 * drop the remove request.
8541 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8545 sector_t target
= s
+ sectors
;
8548 if (bb
->shift
> 0) {
8549 /* When clearing we round the start up and the end down.
8550 * This should not matter as the shift should align with
8551 * the block size and no rounding should ever be needed.
8552 * However it is better the think a block is bad when it
8553 * isn't than to think a block is not bad when it is.
8555 s
+= (1<<bb
->shift
) - 1;
8557 target
>>= bb
->shift
;
8558 sectors
= target
- s
;
8561 write_seqlock_irq(&bb
->lock
);
8566 /* Find the last range that starts before 'target' */
8567 while (hi
- lo
> 1) {
8568 int mid
= (lo
+ hi
) / 2;
8569 sector_t a
= BB_OFFSET(p
[mid
]);
8576 /* p[lo] is the last range that could overlap the
8577 * current range. Earlier ranges could also overlap,
8578 * but only this one can overlap the end of the range.
8580 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8581 /* Partial overlap, leave the tail of this range */
8582 int ack
= BB_ACK(p
[lo
]);
8583 sector_t a
= BB_OFFSET(p
[lo
]);
8584 sector_t end
= a
+ BB_LEN(p
[lo
]);
8587 /* we need to split this range */
8588 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8592 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8594 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8597 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8598 /* there is no longer an overlap */
8603 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8604 /* This range does overlap */
8605 if (BB_OFFSET(p
[lo
]) < s
) {
8606 /* Keep the early parts of this range. */
8607 int ack
= BB_ACK(p
[lo
]);
8608 sector_t start
= BB_OFFSET(p
[lo
]);
8609 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8610 /* now low doesn't overlap, so.. */
8615 /* 'lo' is strictly before, 'hi' is strictly after,
8616 * anything between needs to be discarded
8619 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8620 bb
->count
-= (hi
- lo
- 1);
8626 write_sequnlock_irq(&bb
->lock
);
8630 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8634 s
+= rdev
->new_data_offset
;
8636 s
+= rdev
->data_offset
;
8637 return md_clear_badblocks(&rdev
->badblocks
,
8640 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8643 * Acknowledge all bad blocks in a list.
8644 * This only succeeds if ->changed is clear. It is used by
8645 * in-kernel metadata updates
8647 void md_ack_all_badblocks(struct badblocks
*bb
)
8649 if (bb
->page
== NULL
|| bb
->changed
)
8650 /* no point even trying */
8652 write_seqlock_irq(&bb
->lock
);
8654 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8657 for (i
= 0; i
< bb
->count
; i
++) {
8658 if (!BB_ACK(p
[i
])) {
8659 sector_t start
= BB_OFFSET(p
[i
]);
8660 int len
= BB_LEN(p
[i
]);
8661 p
[i
] = BB_MAKE(start
, len
, 1);
8664 bb
->unacked_exist
= 0;
8666 write_sequnlock_irq(&bb
->lock
);
8668 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8670 /* sysfs access to bad-blocks list.
8671 * We present two files.
8672 * 'bad-blocks' lists sector numbers and lengths of ranges that
8673 * are recorded as bad. The list is truncated to fit within
8674 * the one-page limit of sysfs.
8675 * Writing "sector length" to this file adds an acknowledged
8677 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8678 * been acknowledged. Writing to this file adds bad blocks
8679 * without acknowledging them. This is largely for testing.
8683 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8694 seq
= read_seqbegin(&bb
->lock
);
8699 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8700 sector_t s
= BB_OFFSET(p
[i
]);
8701 unsigned int length
= BB_LEN(p
[i
]);
8702 int ack
= BB_ACK(p
[i
]);
8708 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8709 (unsigned long long)s
<< bb
->shift
,
8710 length
<< bb
->shift
);
8712 if (unack
&& len
== 0)
8713 bb
->unacked_exist
= 0;
8715 if (read_seqretry(&bb
->lock
, seq
))
8724 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8726 unsigned long long sector
;
8730 /* Allow clearing via sysfs *only* for testing/debugging.
8731 * Normally only a successful write may clear a badblock
8734 if (page
[0] == '-') {
8738 #endif /* DO_DEBUG */
8740 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8742 if (newline
!= '\n')
8754 md_clear_badblocks(bb
, sector
, length
);
8757 #endif /* DO_DEBUG */
8758 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8764 static int md_notify_reboot(struct notifier_block
*this,
8765 unsigned long code
, void *x
)
8767 struct list_head
*tmp
;
8768 struct mddev
*mddev
;
8771 for_each_mddev(mddev
, tmp
) {
8772 if (mddev_trylock(mddev
)) {
8774 __md_stop_writes(mddev
);
8775 if (mddev
->persistent
)
8776 mddev
->safemode
= 2;
8777 mddev_unlock(mddev
);
8782 * certain more exotic SCSI devices are known to be
8783 * volatile wrt too early system reboots. While the
8784 * right place to handle this issue is the given
8785 * driver, we do want to have a safe RAID driver ...
8793 static struct notifier_block md_notifier
= {
8794 .notifier_call
= md_notify_reboot
,
8796 .priority
= INT_MAX
, /* before any real devices */
8799 static void md_geninit(void)
8801 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8803 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8806 static int __init
md_init(void)
8810 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8814 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8818 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8821 if ((ret
= register_blkdev(0, "mdp")) < 0)
8825 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8826 md_probe
, NULL
, NULL
);
8827 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8828 md_probe
, NULL
, NULL
);
8830 register_reboot_notifier(&md_notifier
);
8831 raid_table_header
= register_sysctl_table(raid_root_table
);
8837 unregister_blkdev(MD_MAJOR
, "md");
8839 destroy_workqueue(md_misc_wq
);
8841 destroy_workqueue(md_wq
);
8846 void md_reload_sb(struct mddev
*mddev
)
8848 struct md_rdev
*rdev
, *tmp
;
8850 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8851 rdev
->sb_loaded
= 0;
8852 ClearPageUptodate(rdev
->sb_page
);
8854 mddev
->raid_disks
= 0;
8856 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8857 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8858 /* since we don't write to faulty devices, we figure out if the
8859 * disk is faulty by comparing events
8861 if (mddev
->events
> sb
->events
)
8862 set_bit(Faulty
, &rdev
->flags
);
8866 EXPORT_SYMBOL(md_reload_sb
);
8871 * Searches all registered partitions for autorun RAID arrays
8875 static LIST_HEAD(all_detected_devices
);
8876 struct detected_devices_node
{
8877 struct list_head list
;
8881 void md_autodetect_dev(dev_t dev
)
8883 struct detected_devices_node
*node_detected_dev
;
8885 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8886 if (node_detected_dev
) {
8887 node_detected_dev
->dev
= dev
;
8888 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8890 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8891 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8895 static void autostart_arrays(int part
)
8897 struct md_rdev
*rdev
;
8898 struct detected_devices_node
*node_detected_dev
;
8900 int i_scanned
, i_passed
;
8905 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8907 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8909 node_detected_dev
= list_entry(all_detected_devices
.next
,
8910 struct detected_devices_node
, list
);
8911 list_del(&node_detected_dev
->list
);
8912 dev
= node_detected_dev
->dev
;
8913 kfree(node_detected_dev
);
8914 rdev
= md_import_device(dev
,0, 90);
8918 if (test_bit(Faulty
, &rdev
->flags
))
8921 set_bit(AutoDetected
, &rdev
->flags
);
8922 list_add(&rdev
->same_set
, &pending_raid_disks
);
8926 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8927 i_scanned
, i_passed
);
8929 autorun_devices(part
);
8932 #endif /* !MODULE */
8934 static __exit
void md_exit(void)
8936 struct mddev
*mddev
;
8937 struct list_head
*tmp
;
8940 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8941 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8943 unregister_blkdev(MD_MAJOR
,"md");
8944 unregister_blkdev(mdp_major
, "mdp");
8945 unregister_reboot_notifier(&md_notifier
);
8946 unregister_sysctl_table(raid_table_header
);
8948 /* We cannot unload the modules while some process is
8949 * waiting for us in select() or poll() - wake them up
8952 while (waitqueue_active(&md_event_waiters
)) {
8953 /* not safe to leave yet */
8954 wake_up(&md_event_waiters
);
8958 remove_proc_entry("mdstat", NULL
);
8960 for_each_mddev(mddev
, tmp
) {
8961 export_array(mddev
);
8962 mddev
->hold_active
= 0;
8964 destroy_workqueue(md_misc_wq
);
8965 destroy_workqueue(md_wq
);
8968 subsys_initcall(md_init
);
8969 module_exit(md_exit
)
8971 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8973 return sprintf(buffer
, "%d", start_readonly
);
8975 static int set_ro(const char *val
, struct kernel_param
*kp
)
8978 int num
= simple_strtoul(val
, &e
, 10);
8979 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8980 start_readonly
= num
;
8986 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8987 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8988 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8990 MODULE_LICENSE("GPL");
8991 MODULE_DESCRIPTION("MD RAID framework");
8993 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);