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 static struct md_rdev
*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
)
656 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
658 struct md_rdev
*rdev
;
660 rdev_for_each(rdev
, mddev
)
661 if (rdev
->bdev
->bd_dev
== dev
)
667 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
669 struct md_rdev
*rdev
;
671 rdev_for_each_rcu(rdev
, mddev
)
672 if (rdev
->bdev
->bd_dev
== dev
)
678 static struct md_personality
*find_pers(int level
, char *clevel
)
680 struct md_personality
*pers
;
681 list_for_each_entry(pers
, &pers_list
, list
) {
682 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
684 if (strcmp(pers
->name
, clevel
)==0)
690 /* return the offset of the super block in 512byte sectors */
691 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
693 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
694 return MD_NEW_SIZE_SECTORS(num_sectors
);
697 static int alloc_disk_sb(struct md_rdev
*rdev
)
699 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
700 if (!rdev
->sb_page
) {
701 printk(KERN_ALERT
"md: out of memory.\n");
708 void md_rdev_clear(struct md_rdev
*rdev
)
711 put_page(rdev
->sb_page
);
713 rdev
->sb_page
= NULL
;
718 put_page(rdev
->bb_page
);
719 rdev
->bb_page
= NULL
;
721 kfree(rdev
->badblocks
.page
);
722 rdev
->badblocks
.page
= NULL
;
724 EXPORT_SYMBOL_GPL(md_rdev_clear
);
726 static void super_written(struct bio
*bio
, int error
)
728 struct md_rdev
*rdev
= bio
->bi_private
;
729 struct mddev
*mddev
= rdev
->mddev
;
731 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
732 printk("md: super_written gets error=%d, uptodate=%d\n",
733 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
734 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
735 md_error(mddev
, rdev
);
738 if (atomic_dec_and_test(&mddev
->pending_writes
))
739 wake_up(&mddev
->sb_wait
);
743 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
744 sector_t sector
, int size
, struct page
*page
)
746 /* write first size bytes of page to sector of rdev
747 * Increment mddev->pending_writes before returning
748 * and decrement it on completion, waking up sb_wait
749 * if zero is reached.
750 * If an error occurred, call md_error
752 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
754 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
755 bio
->bi_iter
.bi_sector
= sector
;
756 bio_add_page(bio
, page
, size
, 0);
757 bio
->bi_private
= rdev
;
758 bio
->bi_end_io
= super_written
;
760 atomic_inc(&mddev
->pending_writes
);
761 submit_bio(WRITE_FLUSH_FUA
, bio
);
764 void md_super_wait(struct mddev
*mddev
)
766 /* wait for all superblock writes that were scheduled to complete */
767 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
770 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
771 struct page
*page
, int rw
, bool metadata_op
)
773 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
776 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
777 rdev
->meta_bdev
: rdev
->bdev
;
779 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
780 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
781 (rdev
->mddev
->reshape_backwards
==
782 (sector
>= rdev
->mddev
->reshape_position
)))
783 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
785 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
786 bio_add_page(bio
, page
, size
, 0);
787 submit_bio_wait(rw
, bio
);
789 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
793 EXPORT_SYMBOL_GPL(sync_page_io
);
795 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
797 char b
[BDEVNAME_SIZE
];
802 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
808 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
809 bdevname(rdev
->bdev
,b
));
813 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
815 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
816 sb1
->set_uuid1
== sb2
->set_uuid1
&&
817 sb1
->set_uuid2
== sb2
->set_uuid2
&&
818 sb1
->set_uuid3
== sb2
->set_uuid3
;
821 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
824 mdp_super_t
*tmp1
, *tmp2
;
826 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
827 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
829 if (!tmp1
|| !tmp2
) {
831 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
839 * nr_disks is not constant
844 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
851 static u32
md_csum_fold(u32 csum
)
853 csum
= (csum
& 0xffff) + (csum
>> 16);
854 return (csum
& 0xffff) + (csum
>> 16);
857 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
860 u32
*sb32
= (u32
*)sb
;
862 unsigned int disk_csum
, csum
;
864 disk_csum
= sb
->sb_csum
;
867 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
869 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
872 /* This used to use csum_partial, which was wrong for several
873 * reasons including that different results are returned on
874 * different architectures. It isn't critical that we get exactly
875 * the same return value as before (we always csum_fold before
876 * testing, and that removes any differences). However as we
877 * know that csum_partial always returned a 16bit value on
878 * alphas, do a fold to maximise conformity to previous behaviour.
880 sb
->sb_csum
= md_csum_fold(disk_csum
);
882 sb
->sb_csum
= disk_csum
;
888 * Handle superblock details.
889 * We want to be able to handle multiple superblock formats
890 * so we have a common interface to them all, and an array of
891 * different handlers.
892 * We rely on user-space to write the initial superblock, and support
893 * reading and updating of superblocks.
894 * Interface methods are:
895 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
896 * loads and validates a superblock on dev.
897 * if refdev != NULL, compare superblocks on both devices
899 * 0 - dev has a superblock that is compatible with refdev
900 * 1 - dev has a superblock that is compatible and newer than refdev
901 * so dev should be used as the refdev in future
902 * -EINVAL superblock incompatible or invalid
903 * -othererror e.g. -EIO
905 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
906 * Verify that dev is acceptable into mddev.
907 * The first time, mddev->raid_disks will be 0, and data from
908 * dev should be merged in. Subsequent calls check that dev
909 * is new enough. Return 0 or -EINVAL
911 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
912 * Update the superblock for rdev with data in mddev
913 * This does not write to disc.
919 struct module
*owner
;
920 int (*load_super
)(struct md_rdev
*rdev
,
921 struct md_rdev
*refdev
,
923 int (*validate_super
)(struct mddev
*mddev
,
924 struct md_rdev
*rdev
);
925 void (*sync_super
)(struct mddev
*mddev
,
926 struct md_rdev
*rdev
);
927 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
928 sector_t num_sectors
);
929 int (*allow_new_offset
)(struct md_rdev
*rdev
,
930 unsigned long long new_offset
);
934 * Check that the given mddev has no bitmap.
936 * This function is called from the run method of all personalities that do not
937 * support bitmaps. It prints an error message and returns non-zero if mddev
938 * has a bitmap. Otherwise, it returns 0.
941 int md_check_no_bitmap(struct mddev
*mddev
)
943 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
945 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
946 mdname(mddev
), mddev
->pers
->name
);
949 EXPORT_SYMBOL(md_check_no_bitmap
);
952 * load_super for 0.90.0
954 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
956 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
961 * Calculate the position of the superblock (512byte sectors),
962 * it's at the end of the disk.
964 * It also happens to be a multiple of 4Kb.
966 rdev
->sb_start
= calc_dev_sboffset(rdev
);
968 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
973 bdevname(rdev
->bdev
, b
);
974 sb
= page_address(rdev
->sb_page
);
976 if (sb
->md_magic
!= MD_SB_MAGIC
) {
977 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
982 if (sb
->major_version
!= 0 ||
983 sb
->minor_version
< 90 ||
984 sb
->minor_version
> 91) {
985 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
986 sb
->major_version
, sb
->minor_version
,
991 if (sb
->raid_disks
<= 0)
994 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
995 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1000 rdev
->preferred_minor
= sb
->md_minor
;
1001 rdev
->data_offset
= 0;
1002 rdev
->new_data_offset
= 0;
1003 rdev
->sb_size
= MD_SB_BYTES
;
1004 rdev
->badblocks
.shift
= -1;
1006 if (sb
->level
== LEVEL_MULTIPATH
)
1009 rdev
->desc_nr
= sb
->this_disk
.number
;
1015 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1016 if (!uuid_equal(refsb
, sb
)) {
1017 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1018 b
, bdevname(refdev
->bdev
,b2
));
1021 if (!sb_equal(refsb
, sb
)) {
1022 printk(KERN_WARNING
"md: %s has same UUID"
1023 " but different superblock to %s\n",
1024 b
, bdevname(refdev
->bdev
, b2
));
1028 ev2
= md_event(refsb
);
1034 rdev
->sectors
= rdev
->sb_start
;
1035 /* Limit to 4TB as metadata cannot record more than that.
1036 * (not needed for Linear and RAID0 as metadata doesn't
1039 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1040 rdev
->sectors
= (2ULL << 32) - 2;
1042 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1043 /* "this cannot possibly happen" ... */
1051 * validate_super for 0.90.0
1053 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1056 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1057 __u64 ev1
= md_event(sb
);
1059 rdev
->raid_disk
= -1;
1060 clear_bit(Faulty
, &rdev
->flags
);
1061 clear_bit(In_sync
, &rdev
->flags
);
1062 clear_bit(Bitmap_sync
, &rdev
->flags
);
1063 clear_bit(WriteMostly
, &rdev
->flags
);
1065 if (mddev
->raid_disks
== 0) {
1066 mddev
->major_version
= 0;
1067 mddev
->minor_version
= sb
->minor_version
;
1068 mddev
->patch_version
= sb
->patch_version
;
1069 mddev
->external
= 0;
1070 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1071 mddev
->ctime
= sb
->ctime
;
1072 mddev
->utime
= sb
->utime
;
1073 mddev
->level
= sb
->level
;
1074 mddev
->clevel
[0] = 0;
1075 mddev
->layout
= sb
->layout
;
1076 mddev
->raid_disks
= sb
->raid_disks
;
1077 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1078 mddev
->events
= ev1
;
1079 mddev
->bitmap_info
.offset
= 0;
1080 mddev
->bitmap_info
.space
= 0;
1081 /* bitmap can use 60 K after the 4K superblocks */
1082 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1083 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1084 mddev
->reshape_backwards
= 0;
1086 if (mddev
->minor_version
>= 91) {
1087 mddev
->reshape_position
= sb
->reshape_position
;
1088 mddev
->delta_disks
= sb
->delta_disks
;
1089 mddev
->new_level
= sb
->new_level
;
1090 mddev
->new_layout
= sb
->new_layout
;
1091 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1092 if (mddev
->delta_disks
< 0)
1093 mddev
->reshape_backwards
= 1;
1095 mddev
->reshape_position
= MaxSector
;
1096 mddev
->delta_disks
= 0;
1097 mddev
->new_level
= mddev
->level
;
1098 mddev
->new_layout
= mddev
->layout
;
1099 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1102 if (sb
->state
& (1<<MD_SB_CLEAN
))
1103 mddev
->recovery_cp
= MaxSector
;
1105 if (sb
->events_hi
== sb
->cp_events_hi
&&
1106 sb
->events_lo
== sb
->cp_events_lo
) {
1107 mddev
->recovery_cp
= sb
->recovery_cp
;
1109 mddev
->recovery_cp
= 0;
1112 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1113 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1114 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1115 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1117 mddev
->max_disks
= MD_SB_DISKS
;
1119 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1120 mddev
->bitmap_info
.file
== NULL
) {
1121 mddev
->bitmap_info
.offset
=
1122 mddev
->bitmap_info
.default_offset
;
1123 mddev
->bitmap_info
.space
=
1124 mddev
->bitmap_info
.default_space
;
1127 } else if (mddev
->pers
== NULL
) {
1128 /* Insist on good event counter while assembling, except
1129 * for spares (which don't need an event count) */
1131 if (sb
->disks
[rdev
->desc_nr
].state
& (
1132 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1133 if (ev1
< mddev
->events
)
1135 } else if (mddev
->bitmap
) {
1136 /* if adding to array with a bitmap, then we can accept an
1137 * older device ... but not too old.
1139 if (ev1
< mddev
->bitmap
->events_cleared
)
1141 if (ev1
< mddev
->events
)
1142 set_bit(Bitmap_sync
, &rdev
->flags
);
1144 if (ev1
< mddev
->events
)
1145 /* just a hot-add of a new device, leave raid_disk at -1 */
1149 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1150 desc
= sb
->disks
+ rdev
->desc_nr
;
1152 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1153 set_bit(Faulty
, &rdev
->flags
);
1154 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1155 desc->raid_disk < mddev->raid_disks */) {
1156 set_bit(In_sync
, &rdev
->flags
);
1157 rdev
->raid_disk
= desc
->raid_disk
;
1158 rdev
->saved_raid_disk
= desc
->raid_disk
;
1159 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1160 /* active but not in sync implies recovery up to
1161 * reshape position. We don't know exactly where
1162 * that is, so set to zero for now */
1163 if (mddev
->minor_version
>= 91) {
1164 rdev
->recovery_offset
= 0;
1165 rdev
->raid_disk
= desc
->raid_disk
;
1168 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1169 set_bit(WriteMostly
, &rdev
->flags
);
1170 } else /* MULTIPATH are always insync */
1171 set_bit(In_sync
, &rdev
->flags
);
1176 * sync_super for 0.90.0
1178 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1181 struct md_rdev
*rdev2
;
1182 int next_spare
= mddev
->raid_disks
;
1184 /* make rdev->sb match mddev data..
1187 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1188 * 3/ any empty disks < next_spare become removed
1190 * disks[0] gets initialised to REMOVED because
1191 * we cannot be sure from other fields if it has
1192 * been initialised or not.
1195 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1197 rdev
->sb_size
= MD_SB_BYTES
;
1199 sb
= page_address(rdev
->sb_page
);
1201 memset(sb
, 0, sizeof(*sb
));
1203 sb
->md_magic
= MD_SB_MAGIC
;
1204 sb
->major_version
= mddev
->major_version
;
1205 sb
->patch_version
= mddev
->patch_version
;
1206 sb
->gvalid_words
= 0; /* ignored */
1207 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1208 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1209 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1210 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1212 sb
->ctime
= mddev
->ctime
;
1213 sb
->level
= mddev
->level
;
1214 sb
->size
= mddev
->dev_sectors
/ 2;
1215 sb
->raid_disks
= mddev
->raid_disks
;
1216 sb
->md_minor
= mddev
->md_minor
;
1217 sb
->not_persistent
= 0;
1218 sb
->utime
= mddev
->utime
;
1220 sb
->events_hi
= (mddev
->events
>>32);
1221 sb
->events_lo
= (u32
)mddev
->events
;
1223 if (mddev
->reshape_position
== MaxSector
)
1224 sb
->minor_version
= 90;
1226 sb
->minor_version
= 91;
1227 sb
->reshape_position
= mddev
->reshape_position
;
1228 sb
->new_level
= mddev
->new_level
;
1229 sb
->delta_disks
= mddev
->delta_disks
;
1230 sb
->new_layout
= mddev
->new_layout
;
1231 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1233 mddev
->minor_version
= sb
->minor_version
;
1236 sb
->recovery_cp
= mddev
->recovery_cp
;
1237 sb
->cp_events_hi
= (mddev
->events
>>32);
1238 sb
->cp_events_lo
= (u32
)mddev
->events
;
1239 if (mddev
->recovery_cp
== MaxSector
)
1240 sb
->state
= (1<< MD_SB_CLEAN
);
1242 sb
->recovery_cp
= 0;
1244 sb
->layout
= mddev
->layout
;
1245 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1247 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1248 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1250 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1251 rdev_for_each(rdev2
, mddev
) {
1254 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1256 if (rdev2
->raid_disk
>= 0 &&
1257 sb
->minor_version
>= 91)
1258 /* we have nowhere to store the recovery_offset,
1259 * but if it is not below the reshape_position,
1260 * we can piggy-back on that.
1263 if (rdev2
->raid_disk
< 0 ||
1264 test_bit(Faulty
, &rdev2
->flags
))
1267 desc_nr
= rdev2
->raid_disk
;
1269 desc_nr
= next_spare
++;
1270 rdev2
->desc_nr
= desc_nr
;
1271 d
= &sb
->disks
[rdev2
->desc_nr
];
1273 d
->number
= rdev2
->desc_nr
;
1274 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1275 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1277 d
->raid_disk
= rdev2
->raid_disk
;
1279 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1280 if (test_bit(Faulty
, &rdev2
->flags
))
1281 d
->state
= (1<<MD_DISK_FAULTY
);
1282 else if (is_active
) {
1283 d
->state
= (1<<MD_DISK_ACTIVE
);
1284 if (test_bit(In_sync
, &rdev2
->flags
))
1285 d
->state
|= (1<<MD_DISK_SYNC
);
1293 if (test_bit(WriteMostly
, &rdev2
->flags
))
1294 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1296 /* now set the "removed" and "faulty" bits on any missing devices */
1297 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1298 mdp_disk_t
*d
= &sb
->disks
[i
];
1299 if (d
->state
== 0 && d
->number
== 0) {
1302 d
->state
= (1<<MD_DISK_REMOVED
);
1303 d
->state
|= (1<<MD_DISK_FAULTY
);
1307 sb
->nr_disks
= nr_disks
;
1308 sb
->active_disks
= active
;
1309 sb
->working_disks
= working
;
1310 sb
->failed_disks
= failed
;
1311 sb
->spare_disks
= spare
;
1313 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1314 sb
->sb_csum
= calc_sb_csum(sb
);
1318 * rdev_size_change for 0.90.0
1320 static unsigned long long
1321 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1323 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1324 return 0; /* component must fit device */
1325 if (rdev
->mddev
->bitmap_info
.offset
)
1326 return 0; /* can't move bitmap */
1327 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1328 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1329 num_sectors
= rdev
->sb_start
;
1330 /* Limit to 4TB as metadata cannot record more than that.
1331 * 4TB == 2^32 KB, or 2*2^32 sectors.
1333 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1334 num_sectors
= (2ULL << 32) - 2;
1335 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1337 md_super_wait(rdev
->mddev
);
1342 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1344 /* non-zero offset changes not possible with v0.90 */
1345 return new_offset
== 0;
1349 * version 1 superblock
1352 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1356 unsigned long long newcsum
;
1357 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1358 __le32
*isuper
= (__le32
*)sb
;
1360 disk_csum
= sb
->sb_csum
;
1363 for (; size
>= 4; size
-= 4)
1364 newcsum
+= le32_to_cpu(*isuper
++);
1367 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1369 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1370 sb
->sb_csum
= disk_csum
;
1371 return cpu_to_le32(csum
);
1374 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1376 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1378 struct mdp_superblock_1
*sb
;
1382 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1386 * Calculate the position of the superblock in 512byte sectors.
1387 * It is always aligned to a 4K boundary and
1388 * depeding on minor_version, it can be:
1389 * 0: At least 8K, but less than 12K, from end of device
1390 * 1: At start of device
1391 * 2: 4K from start of device.
1393 switch(minor_version
) {
1395 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1397 sb_start
&= ~(sector_t
)(4*2-1);
1408 rdev
->sb_start
= sb_start
;
1410 /* superblock is rarely larger than 1K, but it can be larger,
1411 * and it is safe to read 4k, so we do that
1413 ret
= read_disk_sb(rdev
, 4096);
1414 if (ret
) return ret
;
1416 sb
= page_address(rdev
->sb_page
);
1418 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1419 sb
->major_version
!= cpu_to_le32(1) ||
1420 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1421 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1422 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1425 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1426 printk("md: invalid superblock checksum on %s\n",
1427 bdevname(rdev
->bdev
,b
));
1430 if (le64_to_cpu(sb
->data_size
) < 10) {
1431 printk("md: data_size too small on %s\n",
1432 bdevname(rdev
->bdev
,b
));
1437 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1438 /* Some padding is non-zero, might be a new feature */
1441 rdev
->preferred_minor
= 0xffff;
1442 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1443 rdev
->new_data_offset
= rdev
->data_offset
;
1444 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1445 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1446 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1447 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1449 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1450 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1451 if (rdev
->sb_size
& bmask
)
1452 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1455 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1458 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1461 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1464 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1466 if (!rdev
->bb_page
) {
1467 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1471 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1472 rdev
->badblocks
.count
== 0) {
1473 /* need to load the bad block list.
1474 * Currently we limit it to one page.
1480 int sectors
= le16_to_cpu(sb
->bblog_size
);
1481 if (sectors
> (PAGE_SIZE
/ 512))
1483 offset
= le32_to_cpu(sb
->bblog_offset
);
1486 bb_sector
= (long long)offset
;
1487 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1488 rdev
->bb_page
, READ
, true))
1490 bbp
= (u64
*)page_address(rdev
->bb_page
);
1491 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1492 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1493 u64 bb
= le64_to_cpu(*bbp
);
1494 int count
= bb
& (0x3ff);
1495 u64 sector
= bb
>> 10;
1496 sector
<<= sb
->bblog_shift
;
1497 count
<<= sb
->bblog_shift
;
1500 if (md_set_badblocks(&rdev
->badblocks
,
1501 sector
, count
, 1) == 0)
1504 } else if (sb
->bblog_offset
!= 0)
1505 rdev
->badblocks
.shift
= 0;
1511 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1513 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1514 sb
->level
!= refsb
->level
||
1515 sb
->layout
!= refsb
->layout
||
1516 sb
->chunksize
!= refsb
->chunksize
) {
1517 printk(KERN_WARNING
"md: %s has strangely different"
1518 " superblock to %s\n",
1519 bdevname(rdev
->bdev
,b
),
1520 bdevname(refdev
->bdev
,b2
));
1523 ev1
= le64_to_cpu(sb
->events
);
1524 ev2
= le64_to_cpu(refsb
->events
);
1531 if (minor_version
) {
1532 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1533 sectors
-= rdev
->data_offset
;
1535 sectors
= rdev
->sb_start
;
1536 if (sectors
< le64_to_cpu(sb
->data_size
))
1538 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1542 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1544 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1545 __u64 ev1
= le64_to_cpu(sb
->events
);
1547 rdev
->raid_disk
= -1;
1548 clear_bit(Faulty
, &rdev
->flags
);
1549 clear_bit(In_sync
, &rdev
->flags
);
1550 clear_bit(Bitmap_sync
, &rdev
->flags
);
1551 clear_bit(WriteMostly
, &rdev
->flags
);
1553 if (mddev
->raid_disks
== 0) {
1554 mddev
->major_version
= 1;
1555 mddev
->patch_version
= 0;
1556 mddev
->external
= 0;
1557 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1558 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1559 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1560 mddev
->level
= le32_to_cpu(sb
->level
);
1561 mddev
->clevel
[0] = 0;
1562 mddev
->layout
= le32_to_cpu(sb
->layout
);
1563 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1564 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1565 mddev
->events
= ev1
;
1566 mddev
->bitmap_info
.offset
= 0;
1567 mddev
->bitmap_info
.space
= 0;
1568 /* Default location for bitmap is 1K after superblock
1569 * using 3K - total of 4K
1571 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1572 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1573 mddev
->reshape_backwards
= 0;
1575 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1576 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1578 mddev
->max_disks
= (4096-256)/2;
1580 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1581 mddev
->bitmap_info
.file
== NULL
) {
1582 mddev
->bitmap_info
.offset
=
1583 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1584 /* Metadata doesn't record how much space is available.
1585 * For 1.0, we assume we can use up to the superblock
1586 * if before, else to 4K beyond superblock.
1587 * For others, assume no change is possible.
1589 if (mddev
->minor_version
> 0)
1590 mddev
->bitmap_info
.space
= 0;
1591 else if (mddev
->bitmap_info
.offset
> 0)
1592 mddev
->bitmap_info
.space
=
1593 8 - mddev
->bitmap_info
.offset
;
1595 mddev
->bitmap_info
.space
=
1596 -mddev
->bitmap_info
.offset
;
1599 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1600 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1601 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1602 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1603 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1604 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1605 if (mddev
->delta_disks
< 0 ||
1606 (mddev
->delta_disks
== 0 &&
1607 (le32_to_cpu(sb
->feature_map
)
1608 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1609 mddev
->reshape_backwards
= 1;
1611 mddev
->reshape_position
= MaxSector
;
1612 mddev
->delta_disks
= 0;
1613 mddev
->new_level
= mddev
->level
;
1614 mddev
->new_layout
= mddev
->layout
;
1615 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1618 } else if (mddev
->pers
== NULL
) {
1619 /* Insist of good event counter while assembling, except for
1620 * spares (which don't need an event count) */
1622 if (rdev
->desc_nr
>= 0 &&
1623 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1624 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1625 if (ev1
< mddev
->events
)
1627 } else if (mddev
->bitmap
) {
1628 /* If adding to array with a bitmap, then we can accept an
1629 * older device, but not too old.
1631 if (ev1
< mddev
->bitmap
->events_cleared
)
1633 if (ev1
< mddev
->events
)
1634 set_bit(Bitmap_sync
, &rdev
->flags
);
1636 if (ev1
< mddev
->events
)
1637 /* just a hot-add of a new device, leave raid_disk at -1 */
1640 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1642 if (rdev
->desc_nr
< 0 ||
1643 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1647 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1649 case 0xffff: /* spare */
1651 case 0xfffe: /* faulty */
1652 set_bit(Faulty
, &rdev
->flags
);
1655 rdev
->saved_raid_disk
= role
;
1656 if ((le32_to_cpu(sb
->feature_map
) &
1657 MD_FEATURE_RECOVERY_OFFSET
)) {
1658 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1659 if (!(le32_to_cpu(sb
->feature_map
) &
1660 MD_FEATURE_RECOVERY_BITMAP
))
1661 rdev
->saved_raid_disk
= -1;
1663 set_bit(In_sync
, &rdev
->flags
);
1664 rdev
->raid_disk
= role
;
1667 if (sb
->devflags
& WriteMostly1
)
1668 set_bit(WriteMostly
, &rdev
->flags
);
1669 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1670 set_bit(Replacement
, &rdev
->flags
);
1671 } else /* MULTIPATH are always insync */
1672 set_bit(In_sync
, &rdev
->flags
);
1677 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1679 struct mdp_superblock_1
*sb
;
1680 struct md_rdev
*rdev2
;
1682 /* make rdev->sb match mddev and rdev data. */
1684 sb
= page_address(rdev
->sb_page
);
1686 sb
->feature_map
= 0;
1688 sb
->recovery_offset
= cpu_to_le64(0);
1689 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1691 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1692 sb
->events
= cpu_to_le64(mddev
->events
);
1694 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1696 sb
->resync_offset
= cpu_to_le64(0);
1698 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1700 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1701 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1702 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1703 sb
->level
= cpu_to_le32(mddev
->level
);
1704 sb
->layout
= cpu_to_le32(mddev
->layout
);
1706 if (test_bit(WriteMostly
, &rdev
->flags
))
1707 sb
->devflags
|= WriteMostly1
;
1709 sb
->devflags
&= ~WriteMostly1
;
1710 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1711 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1713 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1714 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1715 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1718 if (rdev
->raid_disk
>= 0 &&
1719 !test_bit(In_sync
, &rdev
->flags
)) {
1721 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1722 sb
->recovery_offset
=
1723 cpu_to_le64(rdev
->recovery_offset
);
1724 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1726 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1728 if (test_bit(Replacement
, &rdev
->flags
))
1730 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1732 if (mddev
->reshape_position
!= MaxSector
) {
1733 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1734 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1735 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1736 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1737 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1738 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1739 if (mddev
->delta_disks
== 0 &&
1740 mddev
->reshape_backwards
)
1742 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1743 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1745 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1746 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1747 - rdev
->data_offset
));
1751 if (rdev
->badblocks
.count
== 0)
1752 /* Nothing to do for bad blocks*/ ;
1753 else if (sb
->bblog_offset
== 0)
1754 /* Cannot record bad blocks on this device */
1755 md_error(mddev
, rdev
);
1757 struct badblocks
*bb
= &rdev
->badblocks
;
1758 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1760 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1765 seq
= read_seqbegin(&bb
->lock
);
1767 memset(bbp
, 0xff, PAGE_SIZE
);
1769 for (i
= 0 ; i
< bb
->count
; i
++) {
1770 u64 internal_bb
= p
[i
];
1771 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1772 | BB_LEN(internal_bb
));
1773 bbp
[i
] = cpu_to_le64(store_bb
);
1776 if (read_seqretry(&bb
->lock
, seq
))
1779 bb
->sector
= (rdev
->sb_start
+
1780 (int)le32_to_cpu(sb
->bblog_offset
));
1781 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1786 rdev_for_each(rdev2
, mddev
)
1787 if (rdev2
->desc_nr
+1 > max_dev
)
1788 max_dev
= rdev2
->desc_nr
+1;
1790 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1792 sb
->max_dev
= cpu_to_le32(max_dev
);
1793 rdev
->sb_size
= max_dev
* 2 + 256;
1794 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1795 if (rdev
->sb_size
& bmask
)
1796 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1798 max_dev
= le32_to_cpu(sb
->max_dev
);
1800 for (i
=0; i
<max_dev
;i
++)
1801 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1803 rdev_for_each(rdev2
, mddev
) {
1805 if (test_bit(Faulty
, &rdev2
->flags
))
1806 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1807 else if (test_bit(In_sync
, &rdev2
->flags
))
1808 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1809 else if (rdev2
->raid_disk
>= 0)
1810 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1812 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1815 sb
->sb_csum
= calc_sb_1_csum(sb
);
1818 static unsigned long long
1819 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1821 struct mdp_superblock_1
*sb
;
1822 sector_t max_sectors
;
1823 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1824 return 0; /* component must fit device */
1825 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1826 return 0; /* too confusing */
1827 if (rdev
->sb_start
< rdev
->data_offset
) {
1828 /* minor versions 1 and 2; superblock before data */
1829 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1830 max_sectors
-= rdev
->data_offset
;
1831 if (!num_sectors
|| num_sectors
> max_sectors
)
1832 num_sectors
= max_sectors
;
1833 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1834 /* minor version 0 with bitmap we can't move */
1837 /* minor version 0; superblock after data */
1839 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1840 sb_start
&= ~(sector_t
)(4*2 - 1);
1841 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1842 if (!num_sectors
|| num_sectors
> max_sectors
)
1843 num_sectors
= max_sectors
;
1844 rdev
->sb_start
= sb_start
;
1846 sb
= page_address(rdev
->sb_page
);
1847 sb
->data_size
= cpu_to_le64(num_sectors
);
1848 sb
->super_offset
= rdev
->sb_start
;
1849 sb
->sb_csum
= calc_sb_1_csum(sb
);
1850 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1852 md_super_wait(rdev
->mddev
);
1858 super_1_allow_new_offset(struct md_rdev
*rdev
,
1859 unsigned long long new_offset
)
1861 /* All necessary checks on new >= old have been done */
1862 struct bitmap
*bitmap
;
1863 if (new_offset
>= rdev
->data_offset
)
1866 /* with 1.0 metadata, there is no metadata to tread on
1867 * so we can always move back */
1868 if (rdev
->mddev
->minor_version
== 0)
1871 /* otherwise we must be sure not to step on
1872 * any metadata, so stay:
1873 * 36K beyond start of superblock
1874 * beyond end of badblocks
1875 * beyond write-intent bitmap
1877 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1879 bitmap
= rdev
->mddev
->bitmap
;
1880 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1881 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1882 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1884 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1890 static struct super_type super_types
[] = {
1893 .owner
= THIS_MODULE
,
1894 .load_super
= super_90_load
,
1895 .validate_super
= super_90_validate
,
1896 .sync_super
= super_90_sync
,
1897 .rdev_size_change
= super_90_rdev_size_change
,
1898 .allow_new_offset
= super_90_allow_new_offset
,
1902 .owner
= THIS_MODULE
,
1903 .load_super
= super_1_load
,
1904 .validate_super
= super_1_validate
,
1905 .sync_super
= super_1_sync
,
1906 .rdev_size_change
= super_1_rdev_size_change
,
1907 .allow_new_offset
= super_1_allow_new_offset
,
1911 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1913 if (mddev
->sync_super
) {
1914 mddev
->sync_super(mddev
, rdev
);
1918 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1920 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1923 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1925 struct md_rdev
*rdev
, *rdev2
;
1928 rdev_for_each_rcu(rdev
, mddev1
)
1929 rdev_for_each_rcu(rdev2
, mddev2
)
1930 if (rdev
->bdev
->bd_contains
==
1931 rdev2
->bdev
->bd_contains
) {
1939 static LIST_HEAD(pending_raid_disks
);
1942 * Try to register data integrity profile for an mddev
1944 * This is called when an array is started and after a disk has been kicked
1945 * from the array. It only succeeds if all working and active component devices
1946 * are integrity capable with matching profiles.
1948 int md_integrity_register(struct mddev
*mddev
)
1950 struct md_rdev
*rdev
, *reference
= NULL
;
1952 if (list_empty(&mddev
->disks
))
1953 return 0; /* nothing to do */
1954 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1955 return 0; /* shouldn't register, or already is */
1956 rdev_for_each(rdev
, mddev
) {
1957 /* skip spares and non-functional disks */
1958 if (test_bit(Faulty
, &rdev
->flags
))
1960 if (rdev
->raid_disk
< 0)
1963 /* Use the first rdev as the reference */
1967 /* does this rdev's profile match the reference profile? */
1968 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1969 rdev
->bdev
->bd_disk
) < 0)
1972 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1975 * All component devices are integrity capable and have matching
1976 * profiles, register the common profile for the md device.
1978 if (blk_integrity_register(mddev
->gendisk
,
1979 bdev_get_integrity(reference
->bdev
)) != 0) {
1980 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1984 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1985 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1986 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1992 EXPORT_SYMBOL(md_integrity_register
);
1994 /* Disable data integrity if non-capable/non-matching disk is being added */
1995 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1997 struct blk_integrity
*bi_rdev
;
1998 struct blk_integrity
*bi_mddev
;
2000 if (!mddev
->gendisk
)
2003 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2004 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2006 if (!bi_mddev
) /* nothing to do */
2008 if (rdev
->raid_disk
< 0) /* skip spares */
2010 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2011 rdev
->bdev
->bd_disk
) >= 0)
2013 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2014 blk_integrity_unregister(mddev
->gendisk
);
2016 EXPORT_SYMBOL(md_integrity_add_rdev
);
2018 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2020 char b
[BDEVNAME_SIZE
];
2025 /* prevent duplicates */
2026 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2029 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2030 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2031 rdev
->sectors
< mddev
->dev_sectors
)) {
2033 /* Cannot change size, so fail
2034 * If mddev->level <= 0, then we don't care
2035 * about aligning sizes (e.g. linear)
2037 if (mddev
->level
> 0)
2040 mddev
->dev_sectors
= rdev
->sectors
;
2043 /* Verify rdev->desc_nr is unique.
2044 * If it is -1, assign a free number, else
2045 * check number is not in use
2048 if (rdev
->desc_nr
< 0) {
2051 choice
= mddev
->raid_disks
;
2052 while (find_rdev_nr_rcu(mddev
, choice
))
2054 rdev
->desc_nr
= choice
;
2056 if (find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2062 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2063 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2064 mdname(mddev
), mddev
->max_disks
);
2067 bdevname(rdev
->bdev
,b
);
2068 while ( (s
=strchr(b
, '/')) != NULL
)
2071 rdev
->mddev
= mddev
;
2072 printk(KERN_INFO
"md: bind<%s>\n", b
);
2074 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2077 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2078 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2079 /* failure here is OK */;
2080 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2082 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2083 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2085 /* May as well allow recovery to be retried once */
2086 mddev
->recovery_disabled
++;
2091 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2096 static void md_delayed_delete(struct work_struct
*ws
)
2098 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2099 kobject_del(&rdev
->kobj
);
2100 kobject_put(&rdev
->kobj
);
2103 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2105 char b
[BDEVNAME_SIZE
];
2107 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2108 list_del_rcu(&rdev
->same_set
);
2109 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2111 sysfs_remove_link(&rdev
->kobj
, "block");
2112 sysfs_put(rdev
->sysfs_state
);
2113 rdev
->sysfs_state
= NULL
;
2114 rdev
->badblocks
.count
= 0;
2115 /* We need to delay this, otherwise we can deadlock when
2116 * writing to 'remove' to "dev/state". We also need
2117 * to delay it due to rcu usage.
2120 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2121 kobject_get(&rdev
->kobj
);
2122 queue_work(md_misc_wq
, &rdev
->del_work
);
2126 * prevent the device from being mounted, repartitioned or
2127 * otherwise reused by a RAID array (or any other kernel
2128 * subsystem), by bd_claiming the device.
2130 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2133 struct block_device
*bdev
;
2134 char b
[BDEVNAME_SIZE
];
2136 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2137 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2139 printk(KERN_ERR
"md: could not open %s.\n",
2140 __bdevname(dev
, b
));
2141 return PTR_ERR(bdev
);
2147 static void unlock_rdev(struct md_rdev
*rdev
)
2149 struct block_device
*bdev
= rdev
->bdev
;
2151 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2154 void md_autodetect_dev(dev_t dev
);
2156 static void export_rdev(struct md_rdev
*rdev
)
2158 char b
[BDEVNAME_SIZE
];
2160 printk(KERN_INFO
"md: export_rdev(%s)\n",
2161 bdevname(rdev
->bdev
,b
));
2162 md_rdev_clear(rdev
);
2164 if (test_bit(AutoDetected
, &rdev
->flags
))
2165 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2168 kobject_put(&rdev
->kobj
);
2171 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2173 unbind_rdev_from_array(rdev
);
2176 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2178 static void export_array(struct mddev
*mddev
)
2180 struct md_rdev
*rdev
;
2182 while (!list_empty(&mddev
->disks
)) {
2183 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2185 md_kick_rdev_from_array(rdev
);
2187 mddev
->raid_disks
= 0;
2188 mddev
->major_version
= 0;
2191 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2193 /* Update each superblock (in-memory image), but
2194 * if we are allowed to, skip spares which already
2195 * have the right event counter, or have one earlier
2196 * (which would mean they aren't being marked as dirty
2197 * with the rest of the array)
2199 struct md_rdev
*rdev
;
2200 rdev_for_each(rdev
, mddev
) {
2201 if (rdev
->sb_events
== mddev
->events
||
2203 rdev
->raid_disk
< 0 &&
2204 rdev
->sb_events
+1 == mddev
->events
)) {
2205 /* Don't update this superblock */
2206 rdev
->sb_loaded
= 2;
2208 sync_super(mddev
, rdev
);
2209 rdev
->sb_loaded
= 1;
2214 void md_update_sb(struct mddev
*mddev
, int force_change
)
2216 struct md_rdev
*rdev
;
2219 int any_badblocks_changed
= 0;
2223 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2227 /* First make sure individual recovery_offsets are correct */
2228 rdev_for_each(rdev
, mddev
) {
2229 if (rdev
->raid_disk
>= 0 &&
2230 mddev
->delta_disks
>= 0 &&
2231 !test_bit(In_sync
, &rdev
->flags
) &&
2232 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2233 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2236 if (!mddev
->persistent
) {
2237 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2238 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2239 if (!mddev
->external
) {
2240 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2241 rdev_for_each(rdev
, mddev
) {
2242 if (rdev
->badblocks
.changed
) {
2243 rdev
->badblocks
.changed
= 0;
2244 md_ack_all_badblocks(&rdev
->badblocks
);
2245 md_error(mddev
, rdev
);
2247 clear_bit(Blocked
, &rdev
->flags
);
2248 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2249 wake_up(&rdev
->blocked_wait
);
2252 wake_up(&mddev
->sb_wait
);
2256 spin_lock(&mddev
->lock
);
2258 mddev
->utime
= get_seconds();
2260 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2262 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2263 /* just a clean<-> dirty transition, possibly leave spares alone,
2264 * though if events isn't the right even/odd, we will have to do
2270 if (mddev
->degraded
)
2271 /* If the array is degraded, then skipping spares is both
2272 * dangerous and fairly pointless.
2273 * Dangerous because a device that was removed from the array
2274 * might have a event_count that still looks up-to-date,
2275 * so it can be re-added without a resync.
2276 * Pointless because if there are any spares to skip,
2277 * then a recovery will happen and soon that array won't
2278 * be degraded any more and the spare can go back to sleep then.
2282 sync_req
= mddev
->in_sync
;
2284 /* If this is just a dirty<->clean transition, and the array is clean
2285 * and 'events' is odd, we can roll back to the previous clean state */
2287 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2288 && mddev
->can_decrease_events
2289 && mddev
->events
!= 1) {
2291 mddev
->can_decrease_events
= 0;
2293 /* otherwise we have to go forward and ... */
2295 mddev
->can_decrease_events
= nospares
;
2299 * This 64-bit counter should never wrap.
2300 * Either we are in around ~1 trillion A.C., assuming
2301 * 1 reboot per second, or we have a bug...
2303 WARN_ON(mddev
->events
== 0);
2305 rdev_for_each(rdev
, mddev
) {
2306 if (rdev
->badblocks
.changed
)
2307 any_badblocks_changed
++;
2308 if (test_bit(Faulty
, &rdev
->flags
))
2309 set_bit(FaultRecorded
, &rdev
->flags
);
2312 sync_sbs(mddev
, nospares
);
2313 spin_unlock(&mddev
->lock
);
2315 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2316 mdname(mddev
), mddev
->in_sync
);
2318 bitmap_update_sb(mddev
->bitmap
);
2319 rdev_for_each(rdev
, mddev
) {
2320 char b
[BDEVNAME_SIZE
];
2322 if (rdev
->sb_loaded
!= 1)
2323 continue; /* no noise on spare devices */
2325 if (!test_bit(Faulty
, &rdev
->flags
)) {
2326 md_super_write(mddev
,rdev
,
2327 rdev
->sb_start
, rdev
->sb_size
,
2329 pr_debug("md: (write) %s's sb offset: %llu\n",
2330 bdevname(rdev
->bdev
, b
),
2331 (unsigned long long)rdev
->sb_start
);
2332 rdev
->sb_events
= mddev
->events
;
2333 if (rdev
->badblocks
.size
) {
2334 md_super_write(mddev
, rdev
,
2335 rdev
->badblocks
.sector
,
2336 rdev
->badblocks
.size
<< 9,
2338 rdev
->badblocks
.size
= 0;
2342 pr_debug("md: %s (skipping faulty)\n",
2343 bdevname(rdev
->bdev
, b
));
2345 if (mddev
->level
== LEVEL_MULTIPATH
)
2346 /* only need to write one superblock... */
2349 md_super_wait(mddev
);
2350 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2352 spin_lock(&mddev
->lock
);
2353 if (mddev
->in_sync
!= sync_req
||
2354 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2355 /* have to write it out again */
2356 spin_unlock(&mddev
->lock
);
2359 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2360 spin_unlock(&mddev
->lock
);
2361 wake_up(&mddev
->sb_wait
);
2362 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2363 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2365 rdev_for_each(rdev
, mddev
) {
2366 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2367 clear_bit(Blocked
, &rdev
->flags
);
2369 if (any_badblocks_changed
)
2370 md_ack_all_badblocks(&rdev
->badblocks
);
2371 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2372 wake_up(&rdev
->blocked_wait
);
2375 EXPORT_SYMBOL(md_update_sb
);
2377 /* words written to sysfs files may, or may not, be \n terminated.
2378 * We want to accept with case. For this we use cmd_match.
2380 static int cmd_match(const char *cmd
, const char *str
)
2382 /* See if cmd, written into a sysfs file, matches
2383 * str. They must either be the same, or cmd can
2384 * have a trailing newline
2386 while (*cmd
&& *str
&& *cmd
== *str
) {
2397 struct rdev_sysfs_entry
{
2398 struct attribute attr
;
2399 ssize_t (*show
)(struct md_rdev
*, char *);
2400 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2404 state_show(struct md_rdev
*rdev
, char *page
)
2408 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2410 if (test_bit(Faulty
, &flags
) ||
2411 rdev
->badblocks
.unacked_exist
) {
2412 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2415 if (test_bit(In_sync
, &flags
)) {
2416 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2419 if (test_bit(WriteMostly
, &flags
)) {
2420 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2423 if (test_bit(Blocked
, &flags
) ||
2424 (rdev
->badblocks
.unacked_exist
2425 && !test_bit(Faulty
, &flags
))) {
2426 len
+= sprintf(page
+len
, "%sblocked", sep
);
2429 if (!test_bit(Faulty
, &flags
) &&
2430 !test_bit(In_sync
, &flags
)) {
2431 len
+= sprintf(page
+len
, "%sspare", sep
);
2434 if (test_bit(WriteErrorSeen
, &flags
)) {
2435 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2438 if (test_bit(WantReplacement
, &flags
)) {
2439 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2442 if (test_bit(Replacement
, &flags
)) {
2443 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2447 return len
+sprintf(page
+len
, "\n");
2451 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2454 * faulty - simulates an error
2455 * remove - disconnects the device
2456 * writemostly - sets write_mostly
2457 * -writemostly - clears write_mostly
2458 * blocked - sets the Blocked flags
2459 * -blocked - clears the Blocked and possibly simulates an error
2460 * insync - sets Insync providing device isn't active
2461 * -insync - clear Insync for a device with a slot assigned,
2462 * so that it gets rebuilt based on bitmap
2463 * write_error - sets WriteErrorSeen
2464 * -write_error - clears WriteErrorSeen
2467 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2468 md_error(rdev
->mddev
, rdev
);
2469 if (test_bit(Faulty
, &rdev
->flags
))
2473 } else if (cmd_match(buf
, "remove")) {
2474 if (rdev
->raid_disk
>= 0)
2477 struct mddev
*mddev
= rdev
->mddev
;
2478 if (mddev_is_clustered(mddev
))
2479 md_cluster_ops
->metadata_update_start(mddev
);
2480 md_kick_rdev_from_array(rdev
);
2482 md_update_sb(mddev
, 1);
2483 md_new_event(mddev
);
2484 if (mddev_is_clustered(mddev
))
2485 md_cluster_ops
->metadata_update_finish(mddev
);
2488 } else if (cmd_match(buf
, "writemostly")) {
2489 set_bit(WriteMostly
, &rdev
->flags
);
2491 } else if (cmd_match(buf
, "-writemostly")) {
2492 clear_bit(WriteMostly
, &rdev
->flags
);
2494 } else if (cmd_match(buf
, "blocked")) {
2495 set_bit(Blocked
, &rdev
->flags
);
2497 } else if (cmd_match(buf
, "-blocked")) {
2498 if (!test_bit(Faulty
, &rdev
->flags
) &&
2499 rdev
->badblocks
.unacked_exist
) {
2500 /* metadata handler doesn't understand badblocks,
2501 * so we need to fail the device
2503 md_error(rdev
->mddev
, rdev
);
2505 clear_bit(Blocked
, &rdev
->flags
);
2506 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2507 wake_up(&rdev
->blocked_wait
);
2508 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2509 md_wakeup_thread(rdev
->mddev
->thread
);
2512 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2513 set_bit(In_sync
, &rdev
->flags
);
2515 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2516 if (rdev
->mddev
->pers
== NULL
) {
2517 clear_bit(In_sync
, &rdev
->flags
);
2518 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2519 rdev
->raid_disk
= -1;
2522 } else if (cmd_match(buf
, "write_error")) {
2523 set_bit(WriteErrorSeen
, &rdev
->flags
);
2525 } else if (cmd_match(buf
, "-write_error")) {
2526 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2528 } else if (cmd_match(buf
, "want_replacement")) {
2529 /* Any non-spare device that is not a replacement can
2530 * become want_replacement at any time, but we then need to
2531 * check if recovery is needed.
2533 if (rdev
->raid_disk
>= 0 &&
2534 !test_bit(Replacement
, &rdev
->flags
))
2535 set_bit(WantReplacement
, &rdev
->flags
);
2536 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2537 md_wakeup_thread(rdev
->mddev
->thread
);
2539 } else if (cmd_match(buf
, "-want_replacement")) {
2540 /* Clearing 'want_replacement' is always allowed.
2541 * Once replacements starts it is too late though.
2544 clear_bit(WantReplacement
, &rdev
->flags
);
2545 } else if (cmd_match(buf
, "replacement")) {
2546 /* Can only set a device as a replacement when array has not
2547 * yet been started. Once running, replacement is automatic
2548 * from spares, or by assigning 'slot'.
2550 if (rdev
->mddev
->pers
)
2553 set_bit(Replacement
, &rdev
->flags
);
2556 } else if (cmd_match(buf
, "-replacement")) {
2557 /* Similarly, can only clear Replacement before start */
2558 if (rdev
->mddev
->pers
)
2561 clear_bit(Replacement
, &rdev
->flags
);
2566 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2567 return err
? err
: len
;
2569 static struct rdev_sysfs_entry rdev_state
=
2570 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2573 errors_show(struct md_rdev
*rdev
, char *page
)
2575 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2579 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2582 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2583 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2584 atomic_set(&rdev
->corrected_errors
, n
);
2589 static struct rdev_sysfs_entry rdev_errors
=
2590 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2593 slot_show(struct md_rdev
*rdev
, char *page
)
2595 if (rdev
->raid_disk
< 0)
2596 return sprintf(page
, "none\n");
2598 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2602 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2606 int slot
= simple_strtoul(buf
, &e
, 10);
2607 if (strncmp(buf
, "none", 4)==0)
2609 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2611 if (rdev
->mddev
->pers
&& slot
== -1) {
2612 /* Setting 'slot' on an active array requires also
2613 * updating the 'rd%d' link, and communicating
2614 * with the personality with ->hot_*_disk.
2615 * For now we only support removing
2616 * failed/spare devices. This normally happens automatically,
2617 * but not when the metadata is externally managed.
2619 if (rdev
->raid_disk
== -1)
2621 /* personality does all needed checks */
2622 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2624 clear_bit(Blocked
, &rdev
->flags
);
2625 remove_and_add_spares(rdev
->mddev
, rdev
);
2626 if (rdev
->raid_disk
>= 0)
2628 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2629 md_wakeup_thread(rdev
->mddev
->thread
);
2630 } else if (rdev
->mddev
->pers
) {
2631 /* Activating a spare .. or possibly reactivating
2632 * if we ever get bitmaps working here.
2635 if (rdev
->raid_disk
!= -1)
2638 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2641 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2644 if (slot
>= rdev
->mddev
->raid_disks
&&
2645 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2648 rdev
->raid_disk
= slot
;
2649 if (test_bit(In_sync
, &rdev
->flags
))
2650 rdev
->saved_raid_disk
= slot
;
2652 rdev
->saved_raid_disk
= -1;
2653 clear_bit(In_sync
, &rdev
->flags
);
2654 clear_bit(Bitmap_sync
, &rdev
->flags
);
2655 err
= rdev
->mddev
->pers
->
2656 hot_add_disk(rdev
->mddev
, rdev
);
2658 rdev
->raid_disk
= -1;
2661 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2662 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2663 /* failure here is OK */;
2664 /* don't wakeup anyone, leave that to userspace. */
2666 if (slot
>= rdev
->mddev
->raid_disks
&&
2667 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2669 rdev
->raid_disk
= slot
;
2670 /* assume it is working */
2671 clear_bit(Faulty
, &rdev
->flags
);
2672 clear_bit(WriteMostly
, &rdev
->flags
);
2673 set_bit(In_sync
, &rdev
->flags
);
2674 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2679 static struct rdev_sysfs_entry rdev_slot
=
2680 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2683 offset_show(struct md_rdev
*rdev
, char *page
)
2685 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2689 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2691 unsigned long long offset
;
2692 if (kstrtoull(buf
, 10, &offset
) < 0)
2694 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2696 if (rdev
->sectors
&& rdev
->mddev
->external
)
2697 /* Must set offset before size, so overlap checks
2700 rdev
->data_offset
= offset
;
2701 rdev
->new_data_offset
= offset
;
2705 static struct rdev_sysfs_entry rdev_offset
=
2706 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2708 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2710 return sprintf(page
, "%llu\n",
2711 (unsigned long long)rdev
->new_data_offset
);
2714 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2715 const char *buf
, size_t len
)
2717 unsigned long long new_offset
;
2718 struct mddev
*mddev
= rdev
->mddev
;
2720 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2723 if (mddev
->sync_thread
||
2724 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2726 if (new_offset
== rdev
->data_offset
)
2727 /* reset is always permitted */
2729 else if (new_offset
> rdev
->data_offset
) {
2730 /* must not push array size beyond rdev_sectors */
2731 if (new_offset
- rdev
->data_offset
2732 + mddev
->dev_sectors
> rdev
->sectors
)
2735 /* Metadata worries about other space details. */
2737 /* decreasing the offset is inconsistent with a backwards
2740 if (new_offset
< rdev
->data_offset
&&
2741 mddev
->reshape_backwards
)
2743 /* Increasing offset is inconsistent with forwards
2744 * reshape. reshape_direction should be set to
2745 * 'backwards' first.
2747 if (new_offset
> rdev
->data_offset
&&
2748 !mddev
->reshape_backwards
)
2751 if (mddev
->pers
&& mddev
->persistent
&&
2752 !super_types
[mddev
->major_version
]
2753 .allow_new_offset(rdev
, new_offset
))
2755 rdev
->new_data_offset
= new_offset
;
2756 if (new_offset
> rdev
->data_offset
)
2757 mddev
->reshape_backwards
= 1;
2758 else if (new_offset
< rdev
->data_offset
)
2759 mddev
->reshape_backwards
= 0;
2763 static struct rdev_sysfs_entry rdev_new_offset
=
2764 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2767 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2769 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2772 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2774 /* check if two start/length pairs overlap */
2782 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2784 unsigned long long blocks
;
2787 if (kstrtoull(buf
, 10, &blocks
) < 0)
2790 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2791 return -EINVAL
; /* sector conversion overflow */
2794 if (new != blocks
* 2)
2795 return -EINVAL
; /* unsigned long long to sector_t overflow */
2802 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2804 struct mddev
*my_mddev
= rdev
->mddev
;
2805 sector_t oldsectors
= rdev
->sectors
;
2808 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2810 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2811 return -EINVAL
; /* too confusing */
2812 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2813 if (my_mddev
->persistent
) {
2814 sectors
= super_types
[my_mddev
->major_version
].
2815 rdev_size_change(rdev
, sectors
);
2818 } else if (!sectors
)
2819 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2821 if (!my_mddev
->pers
->resize
)
2822 /* Cannot change size for RAID0 or Linear etc */
2825 if (sectors
< my_mddev
->dev_sectors
)
2826 return -EINVAL
; /* component must fit device */
2828 rdev
->sectors
= sectors
;
2829 if (sectors
> oldsectors
&& my_mddev
->external
) {
2830 /* Need to check that all other rdevs with the same
2831 * ->bdev do not overlap. 'rcu' is sufficient to walk
2832 * the rdev lists safely.
2833 * This check does not provide a hard guarantee, it
2834 * just helps avoid dangerous mistakes.
2836 struct mddev
*mddev
;
2838 struct list_head
*tmp
;
2841 for_each_mddev(mddev
, tmp
) {
2842 struct md_rdev
*rdev2
;
2844 rdev_for_each(rdev2
, mddev
)
2845 if (rdev
->bdev
== rdev2
->bdev
&&
2847 overlaps(rdev
->data_offset
, rdev
->sectors
,
2860 /* Someone else could have slipped in a size
2861 * change here, but doing so is just silly.
2862 * We put oldsectors back because we *know* it is
2863 * safe, and trust userspace not to race with
2866 rdev
->sectors
= oldsectors
;
2873 static struct rdev_sysfs_entry rdev_size
=
2874 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2876 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2878 unsigned long long recovery_start
= rdev
->recovery_offset
;
2880 if (test_bit(In_sync
, &rdev
->flags
) ||
2881 recovery_start
== MaxSector
)
2882 return sprintf(page
, "none\n");
2884 return sprintf(page
, "%llu\n", recovery_start
);
2887 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2889 unsigned long long recovery_start
;
2891 if (cmd_match(buf
, "none"))
2892 recovery_start
= MaxSector
;
2893 else if (kstrtoull(buf
, 10, &recovery_start
))
2896 if (rdev
->mddev
->pers
&&
2897 rdev
->raid_disk
>= 0)
2900 rdev
->recovery_offset
= recovery_start
;
2901 if (recovery_start
== MaxSector
)
2902 set_bit(In_sync
, &rdev
->flags
);
2904 clear_bit(In_sync
, &rdev
->flags
);
2908 static struct rdev_sysfs_entry rdev_recovery_start
=
2909 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2912 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2914 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2916 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2918 return badblocks_show(&rdev
->badblocks
, page
, 0);
2920 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2922 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2923 /* Maybe that ack was all we needed */
2924 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2925 wake_up(&rdev
->blocked_wait
);
2928 static struct rdev_sysfs_entry rdev_bad_blocks
=
2929 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2931 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2933 return badblocks_show(&rdev
->badblocks
, page
, 1);
2935 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2937 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2939 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2940 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2942 static struct attribute
*rdev_default_attrs
[] = {
2947 &rdev_new_offset
.attr
,
2949 &rdev_recovery_start
.attr
,
2950 &rdev_bad_blocks
.attr
,
2951 &rdev_unack_bad_blocks
.attr
,
2955 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2957 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2958 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2964 return entry
->show(rdev
, page
);
2968 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2969 const char *page
, size_t length
)
2971 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2972 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2974 struct mddev
*mddev
= rdev
->mddev
;
2978 if (!capable(CAP_SYS_ADMIN
))
2980 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2982 if (rdev
->mddev
== NULL
)
2985 rv
= entry
->store(rdev
, page
, length
);
2986 mddev_unlock(mddev
);
2991 static void rdev_free(struct kobject
*ko
)
2993 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
2996 static const struct sysfs_ops rdev_sysfs_ops
= {
2997 .show
= rdev_attr_show
,
2998 .store
= rdev_attr_store
,
3000 static struct kobj_type rdev_ktype
= {
3001 .release
= rdev_free
,
3002 .sysfs_ops
= &rdev_sysfs_ops
,
3003 .default_attrs
= rdev_default_attrs
,
3006 int md_rdev_init(struct md_rdev
*rdev
)
3009 rdev
->saved_raid_disk
= -1;
3010 rdev
->raid_disk
= -1;
3012 rdev
->data_offset
= 0;
3013 rdev
->new_data_offset
= 0;
3014 rdev
->sb_events
= 0;
3015 rdev
->last_read_error
.tv_sec
= 0;
3016 rdev
->last_read_error
.tv_nsec
= 0;
3017 rdev
->sb_loaded
= 0;
3018 rdev
->bb_page
= NULL
;
3019 atomic_set(&rdev
->nr_pending
, 0);
3020 atomic_set(&rdev
->read_errors
, 0);
3021 atomic_set(&rdev
->corrected_errors
, 0);
3023 INIT_LIST_HEAD(&rdev
->same_set
);
3024 init_waitqueue_head(&rdev
->blocked_wait
);
3026 /* Add space to store bad block list.
3027 * This reserves the space even on arrays where it cannot
3028 * be used - I wonder if that matters
3030 rdev
->badblocks
.count
= 0;
3031 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3032 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3033 seqlock_init(&rdev
->badblocks
.lock
);
3034 if (rdev
->badblocks
.page
== NULL
)
3039 EXPORT_SYMBOL_GPL(md_rdev_init
);
3041 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3043 * mark the device faulty if:
3045 * - the device is nonexistent (zero size)
3046 * - the device has no valid superblock
3048 * a faulty rdev _never_ has rdev->sb set.
3050 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3052 char b
[BDEVNAME_SIZE
];
3054 struct md_rdev
*rdev
;
3057 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3059 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3060 return ERR_PTR(-ENOMEM
);
3063 err
= md_rdev_init(rdev
);
3066 err
= alloc_disk_sb(rdev
);
3070 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3074 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3076 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3079 "md: %s has zero or unknown size, marking faulty!\n",
3080 bdevname(rdev
->bdev
,b
));
3085 if (super_format
>= 0) {
3086 err
= super_types
[super_format
].
3087 load_super(rdev
, NULL
, super_minor
);
3088 if (err
== -EINVAL
) {
3090 "md: %s does not have a valid v%d.%d "
3091 "superblock, not importing!\n",
3092 bdevname(rdev
->bdev
,b
),
3093 super_format
, super_minor
);
3098 "md: could not read %s's sb, not importing!\n",
3099 bdevname(rdev
->bdev
,b
));
3109 md_rdev_clear(rdev
);
3111 return ERR_PTR(err
);
3115 * Check a full RAID array for plausibility
3118 static void analyze_sbs(struct mddev
*mddev
)
3121 struct md_rdev
*rdev
, *freshest
, *tmp
;
3122 char b
[BDEVNAME_SIZE
];
3125 rdev_for_each_safe(rdev
, tmp
, mddev
)
3126 switch (super_types
[mddev
->major_version
].
3127 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3135 "md: fatal superblock inconsistency in %s"
3136 " -- removing from array\n",
3137 bdevname(rdev
->bdev
,b
));
3138 md_kick_rdev_from_array(rdev
);
3141 super_types
[mddev
->major_version
].
3142 validate_super(mddev
, freshest
);
3145 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3146 if (mddev
->max_disks
&&
3147 (rdev
->desc_nr
>= mddev
->max_disks
||
3148 i
> mddev
->max_disks
)) {
3150 "md: %s: %s: only %d devices permitted\n",
3151 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3153 md_kick_rdev_from_array(rdev
);
3156 if (rdev
!= freshest
) {
3157 if (super_types
[mddev
->major_version
].
3158 validate_super(mddev
, rdev
)) {
3159 printk(KERN_WARNING
"md: kicking non-fresh %s"
3161 bdevname(rdev
->bdev
,b
));
3162 md_kick_rdev_from_array(rdev
);
3165 /* No device should have a Candidate flag
3166 * when reading devices
3168 if (test_bit(Candidate
, &rdev
->flags
)) {
3169 pr_info("md: kicking Cluster Candidate %s from array!\n",
3170 bdevname(rdev
->bdev
, b
));
3171 md_kick_rdev_from_array(rdev
);
3174 if (mddev
->level
== LEVEL_MULTIPATH
) {
3175 rdev
->desc_nr
= i
++;
3176 rdev
->raid_disk
= rdev
->desc_nr
;
3177 set_bit(In_sync
, &rdev
->flags
);
3178 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3179 rdev
->raid_disk
= -1;
3180 clear_bit(In_sync
, &rdev
->flags
);
3185 /* Read a fixed-point number.
3186 * Numbers in sysfs attributes should be in "standard" units where
3187 * possible, so time should be in seconds.
3188 * However we internally use a a much smaller unit such as
3189 * milliseconds or jiffies.
3190 * This function takes a decimal number with a possible fractional
3191 * component, and produces an integer which is the result of
3192 * multiplying that number by 10^'scale'.
3193 * all without any floating-point arithmetic.
3195 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3197 unsigned long result
= 0;
3199 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3202 else if (decimals
< scale
) {
3205 result
= result
* 10 + value
;
3217 while (decimals
< scale
) {
3225 static void md_safemode_timeout(unsigned long data
);
3228 safe_delay_show(struct mddev
*mddev
, char *page
)
3230 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3231 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3234 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3238 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3241 mddev
->safemode_delay
= 0;
3243 unsigned long old_delay
= mddev
->safemode_delay
;
3244 unsigned long new_delay
= (msec
*HZ
)/1000;
3248 mddev
->safemode_delay
= new_delay
;
3249 if (new_delay
< old_delay
|| old_delay
== 0)
3250 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3254 static struct md_sysfs_entry md_safe_delay
=
3255 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3258 level_show(struct mddev
*mddev
, char *page
)
3260 struct md_personality
*p
;
3262 spin_lock(&mddev
->lock
);
3265 ret
= sprintf(page
, "%s\n", p
->name
);
3266 else if (mddev
->clevel
[0])
3267 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3268 else if (mddev
->level
!= LEVEL_NONE
)
3269 ret
= sprintf(page
, "%d\n", mddev
->level
);
3272 spin_unlock(&mddev
->lock
);
3277 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3282 struct md_personality
*pers
, *oldpers
;
3284 void *priv
, *oldpriv
;
3285 struct md_rdev
*rdev
;
3287 if (slen
== 0 || slen
>= sizeof(clevel
))
3290 rv
= mddev_lock(mddev
);
3294 if (mddev
->pers
== NULL
) {
3295 strncpy(mddev
->clevel
, buf
, slen
);
3296 if (mddev
->clevel
[slen
-1] == '\n')
3298 mddev
->clevel
[slen
] = 0;
3299 mddev
->level
= LEVEL_NONE
;
3307 /* request to change the personality. Need to ensure:
3308 * - array is not engaged in resync/recovery/reshape
3309 * - old personality can be suspended
3310 * - new personality will access other array.
3314 if (mddev
->sync_thread
||
3315 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3316 mddev
->reshape_position
!= MaxSector
||
3317 mddev
->sysfs_active
)
3321 if (!mddev
->pers
->quiesce
) {
3322 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3323 mdname(mddev
), mddev
->pers
->name
);
3327 /* Now find the new personality */
3328 strncpy(clevel
, buf
, slen
);
3329 if (clevel
[slen
-1] == '\n')
3332 if (kstrtol(clevel
, 10, &level
))
3335 if (request_module("md-%s", clevel
) != 0)
3336 request_module("md-level-%s", clevel
);
3337 spin_lock(&pers_lock
);
3338 pers
= find_pers(level
, clevel
);
3339 if (!pers
|| !try_module_get(pers
->owner
)) {
3340 spin_unlock(&pers_lock
);
3341 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3345 spin_unlock(&pers_lock
);
3347 if (pers
== mddev
->pers
) {
3348 /* Nothing to do! */
3349 module_put(pers
->owner
);
3353 if (!pers
->takeover
) {
3354 module_put(pers
->owner
);
3355 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3356 mdname(mddev
), clevel
);
3361 rdev_for_each(rdev
, mddev
)
3362 rdev
->new_raid_disk
= rdev
->raid_disk
;
3364 /* ->takeover must set new_* and/or delta_disks
3365 * if it succeeds, and may set them when it fails.
3367 priv
= pers
->takeover(mddev
);
3369 mddev
->new_level
= mddev
->level
;
3370 mddev
->new_layout
= mddev
->layout
;
3371 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3372 mddev
->raid_disks
-= mddev
->delta_disks
;
3373 mddev
->delta_disks
= 0;
3374 mddev
->reshape_backwards
= 0;
3375 module_put(pers
->owner
);
3376 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3377 mdname(mddev
), clevel
);
3382 /* Looks like we have a winner */
3383 mddev_suspend(mddev
);
3384 mddev_detach(mddev
);
3386 spin_lock(&mddev
->lock
);
3387 oldpers
= mddev
->pers
;
3388 oldpriv
= mddev
->private;
3390 mddev
->private = priv
;
3391 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3392 mddev
->level
= mddev
->new_level
;
3393 mddev
->layout
= mddev
->new_layout
;
3394 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3395 mddev
->delta_disks
= 0;
3396 mddev
->reshape_backwards
= 0;
3397 mddev
->degraded
= 0;
3398 spin_unlock(&mddev
->lock
);
3400 if (oldpers
->sync_request
== NULL
&&
3402 /* We are converting from a no-redundancy array
3403 * to a redundancy array and metadata is managed
3404 * externally so we need to be sure that writes
3405 * won't block due to a need to transition
3407 * until external management is started.
3410 mddev
->safemode_delay
= 0;
3411 mddev
->safemode
= 0;
3414 oldpers
->free(mddev
, oldpriv
);
3416 if (oldpers
->sync_request
== NULL
&&
3417 pers
->sync_request
!= NULL
) {
3418 /* need to add the md_redundancy_group */
3419 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3421 "md: cannot register extra attributes for %s\n",
3423 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3425 if (oldpers
->sync_request
!= NULL
&&
3426 pers
->sync_request
== NULL
) {
3427 /* need to remove the md_redundancy_group */
3428 if (mddev
->to_remove
== NULL
)
3429 mddev
->to_remove
= &md_redundancy_group
;
3432 rdev_for_each(rdev
, mddev
) {
3433 if (rdev
->raid_disk
< 0)
3435 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3436 rdev
->new_raid_disk
= -1;
3437 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3439 sysfs_unlink_rdev(mddev
, rdev
);
3441 rdev_for_each(rdev
, mddev
) {
3442 if (rdev
->raid_disk
< 0)
3444 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3446 rdev
->raid_disk
= rdev
->new_raid_disk
;
3447 if (rdev
->raid_disk
< 0)
3448 clear_bit(In_sync
, &rdev
->flags
);
3450 if (sysfs_link_rdev(mddev
, rdev
))
3451 printk(KERN_WARNING
"md: cannot register rd%d"
3452 " for %s after level change\n",
3453 rdev
->raid_disk
, mdname(mddev
));
3457 if (pers
->sync_request
== NULL
) {
3458 /* this is now an array without redundancy, so
3459 * it must always be in_sync
3462 del_timer_sync(&mddev
->safemode_timer
);
3464 blk_set_stacking_limits(&mddev
->queue
->limits
);
3466 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3467 mddev_resume(mddev
);
3469 md_update_sb(mddev
, 1);
3470 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3471 md_new_event(mddev
);
3474 mddev_unlock(mddev
);
3478 static struct md_sysfs_entry md_level
=
3479 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3482 layout_show(struct mddev
*mddev
, char *page
)
3484 /* just a number, not meaningful for all levels */
3485 if (mddev
->reshape_position
!= MaxSector
&&
3486 mddev
->layout
!= mddev
->new_layout
)
3487 return sprintf(page
, "%d (%d)\n",
3488 mddev
->new_layout
, mddev
->layout
);
3489 return sprintf(page
, "%d\n", mddev
->layout
);
3493 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3496 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3499 if (!*buf
|| (*e
&& *e
!= '\n'))
3501 err
= mddev_lock(mddev
);
3506 if (mddev
->pers
->check_reshape
== NULL
)
3511 mddev
->new_layout
= n
;
3512 err
= mddev
->pers
->check_reshape(mddev
);
3514 mddev
->new_layout
= mddev
->layout
;
3517 mddev
->new_layout
= n
;
3518 if (mddev
->reshape_position
== MaxSector
)
3521 mddev_unlock(mddev
);
3524 static struct md_sysfs_entry md_layout
=
3525 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3528 raid_disks_show(struct mddev
*mddev
, char *page
)
3530 if (mddev
->raid_disks
== 0)
3532 if (mddev
->reshape_position
!= MaxSector
&&
3533 mddev
->delta_disks
!= 0)
3534 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3535 mddev
->raid_disks
- mddev
->delta_disks
);
3536 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3539 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3542 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3546 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3548 if (!*buf
|| (*e
&& *e
!= '\n'))
3551 err
= mddev_lock(mddev
);
3555 err
= update_raid_disks(mddev
, n
);
3556 else if (mddev
->reshape_position
!= MaxSector
) {
3557 struct md_rdev
*rdev
;
3558 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3561 rdev_for_each(rdev
, mddev
) {
3563 rdev
->data_offset
< rdev
->new_data_offset
)
3566 rdev
->data_offset
> rdev
->new_data_offset
)
3570 mddev
->delta_disks
= n
- olddisks
;
3571 mddev
->raid_disks
= n
;
3572 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3574 mddev
->raid_disks
= n
;
3576 mddev_unlock(mddev
);
3577 return err
? err
: len
;
3579 static struct md_sysfs_entry md_raid_disks
=
3580 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3583 chunk_size_show(struct mddev
*mddev
, char *page
)
3585 if (mddev
->reshape_position
!= MaxSector
&&
3586 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3587 return sprintf(page
, "%d (%d)\n",
3588 mddev
->new_chunk_sectors
<< 9,
3589 mddev
->chunk_sectors
<< 9);
3590 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3594 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3598 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3600 if (!*buf
|| (*e
&& *e
!= '\n'))
3603 err
= mddev_lock(mddev
);
3607 if (mddev
->pers
->check_reshape
== NULL
)
3612 mddev
->new_chunk_sectors
= n
>> 9;
3613 err
= mddev
->pers
->check_reshape(mddev
);
3615 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3618 mddev
->new_chunk_sectors
= n
>> 9;
3619 if (mddev
->reshape_position
== MaxSector
)
3620 mddev
->chunk_sectors
= n
>> 9;
3622 mddev_unlock(mddev
);
3625 static struct md_sysfs_entry md_chunk_size
=
3626 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3629 resync_start_show(struct mddev
*mddev
, char *page
)
3631 if (mddev
->recovery_cp
== MaxSector
)
3632 return sprintf(page
, "none\n");
3633 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3637 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3641 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3643 err
= mddev_lock(mddev
);
3646 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3648 else if (cmd_match(buf
, "none"))
3650 else if (!*buf
|| (*e
&& *e
!= '\n'))
3654 mddev
->recovery_cp
= n
;
3656 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3658 mddev_unlock(mddev
);
3661 static struct md_sysfs_entry md_resync_start
=
3662 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3665 * The array state can be:
3668 * No devices, no size, no level
3669 * Equivalent to STOP_ARRAY ioctl
3671 * May have some settings, but array is not active
3672 * all IO results in error
3673 * When written, doesn't tear down array, but just stops it
3674 * suspended (not supported yet)
3675 * All IO requests will block. The array can be reconfigured.
3676 * Writing this, if accepted, will block until array is quiescent
3678 * no resync can happen. no superblocks get written.
3679 * write requests fail
3681 * like readonly, but behaves like 'clean' on a write request.
3683 * clean - no pending writes, but otherwise active.
3684 * When written to inactive array, starts without resync
3685 * If a write request arrives then
3686 * if metadata is known, mark 'dirty' and switch to 'active'.
3687 * if not known, block and switch to write-pending
3688 * If written to an active array that has pending writes, then fails.
3690 * fully active: IO and resync can be happening.
3691 * When written to inactive array, starts with resync
3694 * clean, but writes are blocked waiting for 'active' to be written.
3697 * like active, but no writes have been seen for a while (100msec).
3700 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3701 write_pending
, active_idle
, bad_word
};
3702 static char *array_states
[] = {
3703 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3704 "write-pending", "active-idle", NULL
};
3706 static int match_word(const char *word
, char **list
)
3709 for (n
=0; list
[n
]; n
++)
3710 if (cmd_match(word
, list
[n
]))
3716 array_state_show(struct mddev
*mddev
, char *page
)
3718 enum array_state st
= inactive
;
3731 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3733 else if (mddev
->safemode
)
3739 if (list_empty(&mddev
->disks
) &&
3740 mddev
->raid_disks
== 0 &&
3741 mddev
->dev_sectors
== 0)
3746 return sprintf(page
, "%s\n", array_states
[st
]);
3749 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3750 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3751 static int do_md_run(struct mddev
*mddev
);
3752 static int restart_array(struct mddev
*mddev
);
3755 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3758 enum array_state st
= match_word(buf
, array_states
);
3760 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3761 /* don't take reconfig_mutex when toggling between
3764 spin_lock(&mddev
->lock
);
3766 restart_array(mddev
);
3767 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3768 wake_up(&mddev
->sb_wait
);
3770 } else /* st == clean */ {
3771 restart_array(mddev
);
3772 if (atomic_read(&mddev
->writes_pending
) == 0) {
3773 if (mddev
->in_sync
== 0) {
3775 if (mddev
->safemode
== 1)
3776 mddev
->safemode
= 0;
3777 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3783 spin_unlock(&mddev
->lock
);
3786 err
= mddev_lock(mddev
);
3794 /* stopping an active array */
3795 err
= do_md_stop(mddev
, 0, NULL
);
3798 /* stopping an active array */
3800 err
= do_md_stop(mddev
, 2, NULL
);
3802 err
= 0; /* already inactive */
3805 break; /* not supported yet */
3808 err
= md_set_readonly(mddev
, NULL
);
3811 set_disk_ro(mddev
->gendisk
, 1);
3812 err
= do_md_run(mddev
);
3818 err
= md_set_readonly(mddev
, NULL
);
3819 else if (mddev
->ro
== 1)
3820 err
= restart_array(mddev
);
3823 set_disk_ro(mddev
->gendisk
, 0);
3827 err
= do_md_run(mddev
);
3832 restart_array(mddev
);
3833 spin_lock(&mddev
->lock
);
3834 if (atomic_read(&mddev
->writes_pending
) == 0) {
3835 if (mddev
->in_sync
== 0) {
3837 if (mddev
->safemode
== 1)
3838 mddev
->safemode
= 0;
3839 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3844 spin_unlock(&mddev
->lock
);
3850 restart_array(mddev
);
3851 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3852 wake_up(&mddev
->sb_wait
);
3856 set_disk_ro(mddev
->gendisk
, 0);
3857 err
= do_md_run(mddev
);
3862 /* these cannot be set */
3867 if (mddev
->hold_active
== UNTIL_IOCTL
)
3868 mddev
->hold_active
= 0;
3869 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3871 mddev_unlock(mddev
);
3874 static struct md_sysfs_entry md_array_state
=
3875 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3878 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3879 return sprintf(page
, "%d\n",
3880 atomic_read(&mddev
->max_corr_read_errors
));
3884 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3887 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3889 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3890 atomic_set(&mddev
->max_corr_read_errors
, n
);
3896 static struct md_sysfs_entry max_corr_read_errors
=
3897 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3898 max_corrected_read_errors_store
);
3901 null_show(struct mddev
*mddev
, char *page
)
3907 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3909 /* buf must be %d:%d\n? giving major and minor numbers */
3910 /* The new device is added to the array.
3911 * If the array has a persistent superblock, we read the
3912 * superblock to initialise info and check validity.
3913 * Otherwise, only checking done is that in bind_rdev_to_array,
3914 * which mainly checks size.
3917 int major
= simple_strtoul(buf
, &e
, 10);
3920 struct md_rdev
*rdev
;
3923 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3925 minor
= simple_strtoul(e
+1, &e
, 10);
3926 if (*e
&& *e
!= '\n')
3928 dev
= MKDEV(major
, minor
);
3929 if (major
!= MAJOR(dev
) ||
3930 minor
!= MINOR(dev
))
3933 flush_workqueue(md_misc_wq
);
3935 err
= mddev_lock(mddev
);
3938 if (mddev
->persistent
) {
3939 rdev
= md_import_device(dev
, mddev
->major_version
,
3940 mddev
->minor_version
);
3941 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3942 struct md_rdev
*rdev0
3943 = list_entry(mddev
->disks
.next
,
3944 struct md_rdev
, same_set
);
3945 err
= super_types
[mddev
->major_version
]
3946 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3950 } else if (mddev
->external
)
3951 rdev
= md_import_device(dev
, -2, -1);
3953 rdev
= md_import_device(dev
, -1, -1);
3956 return PTR_ERR(rdev
);
3957 err
= bind_rdev_to_array(rdev
, mddev
);
3961 mddev_unlock(mddev
);
3962 return err
? err
: len
;
3965 static struct md_sysfs_entry md_new_device
=
3966 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3969 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3972 unsigned long chunk
, end_chunk
;
3975 err
= mddev_lock(mddev
);
3980 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3982 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3983 if (buf
== end
) break;
3984 if (*end
== '-') { /* range */
3986 end_chunk
= simple_strtoul(buf
, &end
, 0);
3987 if (buf
== end
) break;
3989 if (*end
&& !isspace(*end
)) break;
3990 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3991 buf
= skip_spaces(end
);
3993 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3995 mddev_unlock(mddev
);
3999 static struct md_sysfs_entry md_bitmap
=
4000 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4003 size_show(struct mddev
*mddev
, char *page
)
4005 return sprintf(page
, "%llu\n",
4006 (unsigned long long)mddev
->dev_sectors
/ 2);
4009 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4012 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4014 /* If array is inactive, we can reduce the component size, but
4015 * not increase it (except from 0).
4016 * If array is active, we can try an on-line resize
4019 int err
= strict_blocks_to_sectors(buf
, §ors
);
4023 err
= mddev_lock(mddev
);
4027 if (mddev_is_clustered(mddev
))
4028 md_cluster_ops
->metadata_update_start(mddev
);
4029 err
= update_size(mddev
, sectors
);
4030 md_update_sb(mddev
, 1);
4031 if (mddev_is_clustered(mddev
))
4032 md_cluster_ops
->metadata_update_finish(mddev
);
4034 if (mddev
->dev_sectors
== 0 ||
4035 mddev
->dev_sectors
> sectors
)
4036 mddev
->dev_sectors
= sectors
;
4040 mddev_unlock(mddev
);
4041 return err
? err
: len
;
4044 static struct md_sysfs_entry md_size
=
4045 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4047 /* Metadata version.
4049 * 'none' for arrays with no metadata (good luck...)
4050 * 'external' for arrays with externally managed metadata,
4051 * or N.M for internally known formats
4054 metadata_show(struct mddev
*mddev
, char *page
)
4056 if (mddev
->persistent
)
4057 return sprintf(page
, "%d.%d\n",
4058 mddev
->major_version
, mddev
->minor_version
);
4059 else if (mddev
->external
)
4060 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4062 return sprintf(page
, "none\n");
4066 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4071 /* Changing the details of 'external' metadata is
4072 * always permitted. Otherwise there must be
4073 * no devices attached to the array.
4076 err
= mddev_lock(mddev
);
4080 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4082 else if (!list_empty(&mddev
->disks
))
4086 if (cmd_match(buf
, "none")) {
4087 mddev
->persistent
= 0;
4088 mddev
->external
= 0;
4089 mddev
->major_version
= 0;
4090 mddev
->minor_version
= 90;
4093 if (strncmp(buf
, "external:", 9) == 0) {
4094 size_t namelen
= len
-9;
4095 if (namelen
>= sizeof(mddev
->metadata_type
))
4096 namelen
= sizeof(mddev
->metadata_type
)-1;
4097 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4098 mddev
->metadata_type
[namelen
] = 0;
4099 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4100 mddev
->metadata_type
[--namelen
] = 0;
4101 mddev
->persistent
= 0;
4102 mddev
->external
= 1;
4103 mddev
->major_version
= 0;
4104 mddev
->minor_version
= 90;
4107 major
= simple_strtoul(buf
, &e
, 10);
4109 if (e
==buf
|| *e
!= '.')
4112 minor
= simple_strtoul(buf
, &e
, 10);
4113 if (e
==buf
|| (*e
&& *e
!= '\n') )
4116 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4118 mddev
->major_version
= major
;
4119 mddev
->minor_version
= minor
;
4120 mddev
->persistent
= 1;
4121 mddev
->external
= 0;
4124 mddev_unlock(mddev
);
4128 static struct md_sysfs_entry md_metadata
=
4129 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4132 action_show(struct mddev
*mddev
, char *page
)
4134 char *type
= "idle";
4135 unsigned long recovery
= mddev
->recovery
;
4136 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4138 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4139 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4140 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4142 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4143 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4145 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4149 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4152 return sprintf(page
, "%s\n", type
);
4156 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4158 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4161 if (cmd_match(page
, "frozen"))
4162 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4164 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4166 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4167 flush_workqueue(md_misc_wq
);
4168 if (mddev
->sync_thread
) {
4169 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4170 if (mddev_lock(mddev
) == 0) {
4171 md_reap_sync_thread(mddev
);
4172 mddev_unlock(mddev
);
4175 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4176 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4178 else if (cmd_match(page
, "resync"))
4179 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4180 else if (cmd_match(page
, "recover")) {
4181 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4182 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4183 } else if (cmd_match(page
, "reshape")) {
4185 if (mddev
->pers
->start_reshape
== NULL
)
4187 err
= mddev_lock(mddev
);
4189 err
= mddev
->pers
->start_reshape(mddev
);
4190 mddev_unlock(mddev
);
4194 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4196 if (cmd_match(page
, "check"))
4197 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4198 else if (!cmd_match(page
, "repair"))
4200 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4201 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4203 if (mddev
->ro
== 2) {
4204 /* A write to sync_action is enough to justify
4205 * canceling read-auto mode
4208 md_wakeup_thread(mddev
->sync_thread
);
4210 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4211 md_wakeup_thread(mddev
->thread
);
4212 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4216 static struct md_sysfs_entry md_scan_mode
=
4217 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4220 last_sync_action_show(struct mddev
*mddev
, char *page
)
4222 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4225 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4228 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4230 return sprintf(page
, "%llu\n",
4231 (unsigned long long)
4232 atomic64_read(&mddev
->resync_mismatches
));
4235 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4238 sync_min_show(struct mddev
*mddev
, char *page
)
4240 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4241 mddev
->sync_speed_min
? "local": "system");
4245 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4249 if (strncmp(buf
, "system", 6)==0) {
4250 mddev
->sync_speed_min
= 0;
4253 min
= simple_strtoul(buf
, &e
, 10);
4254 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4256 mddev
->sync_speed_min
= min
;
4260 static struct md_sysfs_entry md_sync_min
=
4261 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4264 sync_max_show(struct mddev
*mddev
, char *page
)
4266 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4267 mddev
->sync_speed_max
? "local": "system");
4271 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4275 if (strncmp(buf
, "system", 6)==0) {
4276 mddev
->sync_speed_max
= 0;
4279 max
= simple_strtoul(buf
, &e
, 10);
4280 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4282 mddev
->sync_speed_max
= max
;
4286 static struct md_sysfs_entry md_sync_max
=
4287 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4290 degraded_show(struct mddev
*mddev
, char *page
)
4292 return sprintf(page
, "%d\n", mddev
->degraded
);
4294 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4297 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4299 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4303 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4307 if (kstrtol(buf
, 10, &n
))
4310 if (n
!= 0 && n
!= 1)
4313 mddev
->parallel_resync
= n
;
4315 if (mddev
->sync_thread
)
4316 wake_up(&resync_wait
);
4321 /* force parallel resync, even with shared block devices */
4322 static struct md_sysfs_entry md_sync_force_parallel
=
4323 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4324 sync_force_parallel_show
, sync_force_parallel_store
);
4327 sync_speed_show(struct mddev
*mddev
, char *page
)
4329 unsigned long resync
, dt
, db
;
4330 if (mddev
->curr_resync
== 0)
4331 return sprintf(page
, "none\n");
4332 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4333 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4335 db
= resync
- mddev
->resync_mark_cnt
;
4336 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4339 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4342 sync_completed_show(struct mddev
*mddev
, char *page
)
4344 unsigned long long max_sectors
, resync
;
4346 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4347 return sprintf(page
, "none\n");
4349 if (mddev
->curr_resync
== 1 ||
4350 mddev
->curr_resync
== 2)
4351 return sprintf(page
, "delayed\n");
4353 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4354 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4355 max_sectors
= mddev
->resync_max_sectors
;
4357 max_sectors
= mddev
->dev_sectors
;
4359 resync
= mddev
->curr_resync_completed
;
4360 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4363 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4366 min_sync_show(struct mddev
*mddev
, char *page
)
4368 return sprintf(page
, "%llu\n",
4369 (unsigned long long)mddev
->resync_min
);
4372 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4374 unsigned long long min
;
4378 if (kstrtoull(buf
, 10, &min
))
4381 spin_lock(&mddev
->lock
);
4383 if (min
> mddev
->resync_max
)
4387 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4390 /* Must be a multiple of chunk_size */
4391 chunk
= mddev
->chunk_sectors
;
4393 sector_t temp
= min
;
4396 if (sector_div(temp
, chunk
))
4399 mddev
->resync_min
= min
;
4403 spin_unlock(&mddev
->lock
);
4407 static struct md_sysfs_entry md_min_sync
=
4408 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4411 max_sync_show(struct mddev
*mddev
, char *page
)
4413 if (mddev
->resync_max
== MaxSector
)
4414 return sprintf(page
, "max\n");
4416 return sprintf(page
, "%llu\n",
4417 (unsigned long long)mddev
->resync_max
);
4420 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4423 spin_lock(&mddev
->lock
);
4424 if (strncmp(buf
, "max", 3) == 0)
4425 mddev
->resync_max
= MaxSector
;
4427 unsigned long long max
;
4431 if (kstrtoull(buf
, 10, &max
))
4433 if (max
< mddev
->resync_min
)
4437 if (max
< mddev
->resync_max
&&
4439 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4442 /* Must be a multiple of chunk_size */
4443 chunk
= mddev
->chunk_sectors
;
4445 sector_t temp
= max
;
4448 if (sector_div(temp
, chunk
))
4451 mddev
->resync_max
= max
;
4453 wake_up(&mddev
->recovery_wait
);
4456 spin_unlock(&mddev
->lock
);
4460 static struct md_sysfs_entry md_max_sync
=
4461 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4464 suspend_lo_show(struct mddev
*mddev
, char *page
)
4466 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4470 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4473 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4474 unsigned long long old
;
4477 if (buf
== e
|| (*e
&& *e
!= '\n'))
4480 err
= mddev_lock(mddev
);
4484 if (mddev
->pers
== NULL
||
4485 mddev
->pers
->quiesce
== NULL
)
4487 old
= mddev
->suspend_lo
;
4488 mddev
->suspend_lo
= new;
4490 /* Shrinking suspended region */
4491 mddev
->pers
->quiesce(mddev
, 2);
4493 /* Expanding suspended region - need to wait */
4494 mddev
->pers
->quiesce(mddev
, 1);
4495 mddev
->pers
->quiesce(mddev
, 0);
4499 mddev_unlock(mddev
);
4502 static struct md_sysfs_entry md_suspend_lo
=
4503 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4506 suspend_hi_show(struct mddev
*mddev
, char *page
)
4508 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4512 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4515 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4516 unsigned long long old
;
4519 if (buf
== e
|| (*e
&& *e
!= '\n'))
4522 err
= mddev_lock(mddev
);
4526 if (mddev
->pers
== NULL
||
4527 mddev
->pers
->quiesce
== NULL
)
4529 old
= mddev
->suspend_hi
;
4530 mddev
->suspend_hi
= new;
4532 /* Shrinking suspended region */
4533 mddev
->pers
->quiesce(mddev
, 2);
4535 /* Expanding suspended region - need to wait */
4536 mddev
->pers
->quiesce(mddev
, 1);
4537 mddev
->pers
->quiesce(mddev
, 0);
4541 mddev_unlock(mddev
);
4544 static struct md_sysfs_entry md_suspend_hi
=
4545 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4548 reshape_position_show(struct mddev
*mddev
, char *page
)
4550 if (mddev
->reshape_position
!= MaxSector
)
4551 return sprintf(page
, "%llu\n",
4552 (unsigned long long)mddev
->reshape_position
);
4553 strcpy(page
, "none\n");
4558 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4560 struct md_rdev
*rdev
;
4563 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4565 if (buf
== e
|| (*e
&& *e
!= '\n'))
4567 err
= mddev_lock(mddev
);
4573 mddev
->reshape_position
= new;
4574 mddev
->delta_disks
= 0;
4575 mddev
->reshape_backwards
= 0;
4576 mddev
->new_level
= mddev
->level
;
4577 mddev
->new_layout
= mddev
->layout
;
4578 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4579 rdev_for_each(rdev
, mddev
)
4580 rdev
->new_data_offset
= rdev
->data_offset
;
4583 mddev_unlock(mddev
);
4587 static struct md_sysfs_entry md_reshape_position
=
4588 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4589 reshape_position_store
);
4592 reshape_direction_show(struct mddev
*mddev
, char *page
)
4594 return sprintf(page
, "%s\n",
4595 mddev
->reshape_backwards
? "backwards" : "forwards");
4599 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4604 if (cmd_match(buf
, "forwards"))
4606 else if (cmd_match(buf
, "backwards"))
4610 if (mddev
->reshape_backwards
== backwards
)
4613 err
= mddev_lock(mddev
);
4616 /* check if we are allowed to change */
4617 if (mddev
->delta_disks
)
4619 else if (mddev
->persistent
&&
4620 mddev
->major_version
== 0)
4623 mddev
->reshape_backwards
= backwards
;
4624 mddev_unlock(mddev
);
4628 static struct md_sysfs_entry md_reshape_direction
=
4629 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4630 reshape_direction_store
);
4633 array_size_show(struct mddev
*mddev
, char *page
)
4635 if (mddev
->external_size
)
4636 return sprintf(page
, "%llu\n",
4637 (unsigned long long)mddev
->array_sectors
/2);
4639 return sprintf(page
, "default\n");
4643 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4648 err
= mddev_lock(mddev
);
4652 if (strncmp(buf
, "default", 7) == 0) {
4654 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4656 sectors
= mddev
->array_sectors
;
4658 mddev
->external_size
= 0;
4660 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4662 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4665 mddev
->external_size
= 1;
4669 mddev
->array_sectors
= sectors
;
4671 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4672 revalidate_disk(mddev
->gendisk
);
4675 mddev_unlock(mddev
);
4679 static struct md_sysfs_entry md_array_size
=
4680 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4683 static struct attribute
*md_default_attrs
[] = {
4686 &md_raid_disks
.attr
,
4687 &md_chunk_size
.attr
,
4689 &md_resync_start
.attr
,
4691 &md_new_device
.attr
,
4692 &md_safe_delay
.attr
,
4693 &md_array_state
.attr
,
4694 &md_reshape_position
.attr
,
4695 &md_reshape_direction
.attr
,
4696 &md_array_size
.attr
,
4697 &max_corr_read_errors
.attr
,
4701 static struct attribute
*md_redundancy_attrs
[] = {
4703 &md_last_scan_mode
.attr
,
4704 &md_mismatches
.attr
,
4707 &md_sync_speed
.attr
,
4708 &md_sync_force_parallel
.attr
,
4709 &md_sync_completed
.attr
,
4712 &md_suspend_lo
.attr
,
4713 &md_suspend_hi
.attr
,
4718 static struct attribute_group md_redundancy_group
= {
4720 .attrs
= md_redundancy_attrs
,
4724 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4726 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4727 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4732 spin_lock(&all_mddevs_lock
);
4733 if (list_empty(&mddev
->all_mddevs
)) {
4734 spin_unlock(&all_mddevs_lock
);
4738 spin_unlock(&all_mddevs_lock
);
4740 rv
= entry
->show(mddev
, page
);
4746 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4747 const char *page
, size_t length
)
4749 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4750 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4755 if (!capable(CAP_SYS_ADMIN
))
4757 spin_lock(&all_mddevs_lock
);
4758 if (list_empty(&mddev
->all_mddevs
)) {
4759 spin_unlock(&all_mddevs_lock
);
4763 spin_unlock(&all_mddevs_lock
);
4764 rv
= entry
->store(mddev
, page
, length
);
4769 static void md_free(struct kobject
*ko
)
4771 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4773 if (mddev
->sysfs_state
)
4774 sysfs_put(mddev
->sysfs_state
);
4776 if (mddev
->gendisk
) {
4777 del_gendisk(mddev
->gendisk
);
4778 put_disk(mddev
->gendisk
);
4781 blk_cleanup_queue(mddev
->queue
);
4786 static const struct sysfs_ops md_sysfs_ops
= {
4787 .show
= md_attr_show
,
4788 .store
= md_attr_store
,
4790 static struct kobj_type md_ktype
= {
4792 .sysfs_ops
= &md_sysfs_ops
,
4793 .default_attrs
= md_default_attrs
,
4798 static void mddev_delayed_delete(struct work_struct
*ws
)
4800 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4802 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4803 kobject_del(&mddev
->kobj
);
4804 kobject_put(&mddev
->kobj
);
4807 static int md_alloc(dev_t dev
, char *name
)
4809 static DEFINE_MUTEX(disks_mutex
);
4810 struct mddev
*mddev
= mddev_find(dev
);
4811 struct gendisk
*disk
;
4820 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4821 shift
= partitioned
? MdpMinorShift
: 0;
4822 unit
= MINOR(mddev
->unit
) >> shift
;
4824 /* wait for any previous instance of this device to be
4825 * completely removed (mddev_delayed_delete).
4827 flush_workqueue(md_misc_wq
);
4829 mutex_lock(&disks_mutex
);
4835 /* Need to ensure that 'name' is not a duplicate.
4837 struct mddev
*mddev2
;
4838 spin_lock(&all_mddevs_lock
);
4840 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4841 if (mddev2
->gendisk
&&
4842 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4843 spin_unlock(&all_mddevs_lock
);
4846 spin_unlock(&all_mddevs_lock
);
4850 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4853 mddev
->queue
->queuedata
= mddev
;
4855 blk_queue_make_request(mddev
->queue
, md_make_request
);
4856 blk_set_stacking_limits(&mddev
->queue
->limits
);
4858 disk
= alloc_disk(1 << shift
);
4860 blk_cleanup_queue(mddev
->queue
);
4861 mddev
->queue
= NULL
;
4864 disk
->major
= MAJOR(mddev
->unit
);
4865 disk
->first_minor
= unit
<< shift
;
4867 strcpy(disk
->disk_name
, name
);
4868 else if (partitioned
)
4869 sprintf(disk
->disk_name
, "md_d%d", unit
);
4871 sprintf(disk
->disk_name
, "md%d", unit
);
4872 disk
->fops
= &md_fops
;
4873 disk
->private_data
= mddev
;
4874 disk
->queue
= mddev
->queue
;
4875 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4876 /* Allow extended partitions. This makes the
4877 * 'mdp' device redundant, but we can't really
4880 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4881 mddev
->gendisk
= disk
;
4882 /* As soon as we call add_disk(), another thread could get
4883 * through to md_open, so make sure it doesn't get too far
4885 mutex_lock(&mddev
->open_mutex
);
4888 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4889 &disk_to_dev(disk
)->kobj
, "%s", "md");
4891 /* This isn't possible, but as kobject_init_and_add is marked
4892 * __must_check, we must do something with the result
4894 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4898 if (mddev
->kobj
.sd
&&
4899 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4900 printk(KERN_DEBUG
"pointless warning\n");
4901 mutex_unlock(&mddev
->open_mutex
);
4903 mutex_unlock(&disks_mutex
);
4904 if (!error
&& mddev
->kobj
.sd
) {
4905 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4906 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4912 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4914 md_alloc(dev
, NULL
);
4918 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4920 /* val must be "md_*" where * is not all digits.
4921 * We allocate an array with a large free minor number, and
4922 * set the name to val. val must not already be an active name.
4924 int len
= strlen(val
);
4925 char buf
[DISK_NAME_LEN
];
4927 while (len
&& val
[len
-1] == '\n')
4929 if (len
>= DISK_NAME_LEN
)
4931 strlcpy(buf
, val
, len
+1);
4932 if (strncmp(buf
, "md_", 3) != 0)
4934 return md_alloc(0, buf
);
4937 static void md_safemode_timeout(unsigned long data
)
4939 struct mddev
*mddev
= (struct mddev
*) data
;
4941 if (!atomic_read(&mddev
->writes_pending
)) {
4942 mddev
->safemode
= 1;
4943 if (mddev
->external
)
4944 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4946 md_wakeup_thread(mddev
->thread
);
4949 static int start_dirty_degraded
;
4951 int md_run(struct mddev
*mddev
)
4954 struct md_rdev
*rdev
;
4955 struct md_personality
*pers
;
4957 if (list_empty(&mddev
->disks
))
4958 /* cannot run an array with no devices.. */
4963 /* Cannot run until previous stop completes properly */
4964 if (mddev
->sysfs_active
)
4968 * Analyze all RAID superblock(s)
4970 if (!mddev
->raid_disks
) {
4971 if (!mddev
->persistent
)
4976 if (mddev
->level
!= LEVEL_NONE
)
4977 request_module("md-level-%d", mddev
->level
);
4978 else if (mddev
->clevel
[0])
4979 request_module("md-%s", mddev
->clevel
);
4982 * Drop all container device buffers, from now on
4983 * the only valid external interface is through the md
4986 rdev_for_each(rdev
, mddev
) {
4987 if (test_bit(Faulty
, &rdev
->flags
))
4989 sync_blockdev(rdev
->bdev
);
4990 invalidate_bdev(rdev
->bdev
);
4992 /* perform some consistency tests on the device.
4993 * We don't want the data to overlap the metadata,
4994 * Internal Bitmap issues have been handled elsewhere.
4996 if (rdev
->meta_bdev
) {
4997 /* Nothing to check */;
4998 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4999 if (mddev
->dev_sectors
&&
5000 rdev
->data_offset
+ mddev
->dev_sectors
5002 printk("md: %s: data overlaps metadata\n",
5007 if (rdev
->sb_start
+ rdev
->sb_size
/512
5008 > rdev
->data_offset
) {
5009 printk("md: %s: metadata overlaps data\n",
5014 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5017 if (mddev
->bio_set
== NULL
)
5018 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5020 spin_lock(&pers_lock
);
5021 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5022 if (!pers
|| !try_module_get(pers
->owner
)) {
5023 spin_unlock(&pers_lock
);
5024 if (mddev
->level
!= LEVEL_NONE
)
5025 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5028 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5032 spin_unlock(&pers_lock
);
5033 if (mddev
->level
!= pers
->level
) {
5034 mddev
->level
= pers
->level
;
5035 mddev
->new_level
= pers
->level
;
5037 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5039 if (mddev
->reshape_position
!= MaxSector
&&
5040 pers
->start_reshape
== NULL
) {
5041 /* This personality cannot handle reshaping... */
5042 module_put(pers
->owner
);
5046 if (pers
->sync_request
) {
5047 /* Warn if this is a potentially silly
5050 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5051 struct md_rdev
*rdev2
;
5054 rdev_for_each(rdev
, mddev
)
5055 rdev_for_each(rdev2
, mddev
) {
5057 rdev
->bdev
->bd_contains
==
5058 rdev2
->bdev
->bd_contains
) {
5060 "%s: WARNING: %s appears to be"
5061 " on the same physical disk as"
5064 bdevname(rdev
->bdev
,b
),
5065 bdevname(rdev2
->bdev
,b2
));
5072 "True protection against single-disk"
5073 " failure might be compromised.\n");
5076 mddev
->recovery
= 0;
5077 /* may be over-ridden by personality */
5078 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5080 mddev
->ok_start_degraded
= start_dirty_degraded
;
5082 if (start_readonly
&& mddev
->ro
== 0)
5083 mddev
->ro
= 2; /* read-only, but switch on first write */
5085 err
= pers
->run(mddev
);
5087 printk(KERN_ERR
"md: pers->run() failed ...\n");
5088 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5089 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5090 " but 'external_size' not in effect?\n", __func__
);
5092 "md: invalid array_size %llu > default size %llu\n",
5093 (unsigned long long)mddev
->array_sectors
/ 2,
5094 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5097 if (err
== 0 && pers
->sync_request
&&
5098 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5099 struct bitmap
*bitmap
;
5101 bitmap
= bitmap_create(mddev
, -1);
5102 if (IS_ERR(bitmap
)) {
5103 err
= PTR_ERR(bitmap
);
5104 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5105 mdname(mddev
), err
);
5107 mddev
->bitmap
= bitmap
;
5111 mddev_detach(mddev
);
5112 pers
->free(mddev
, mddev
->private);
5113 module_put(pers
->owner
);
5114 bitmap_destroy(mddev
);
5118 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5119 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5120 blk_queue_merge_bvec(mddev
->queue
, md_mergeable_bvec
);
5122 if (pers
->sync_request
) {
5123 if (mddev
->kobj
.sd
&&
5124 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5126 "md: cannot register extra attributes for %s\n",
5128 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5129 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5132 atomic_set(&mddev
->writes_pending
,0);
5133 atomic_set(&mddev
->max_corr_read_errors
,
5134 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5135 mddev
->safemode
= 0;
5136 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5137 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5138 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5141 spin_lock(&mddev
->lock
);
5144 spin_unlock(&mddev
->lock
);
5145 rdev_for_each(rdev
, mddev
)
5146 if (rdev
->raid_disk
>= 0)
5147 if (sysfs_link_rdev(mddev
, rdev
))
5148 /* failure here is OK */;
5150 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5152 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5153 md_update_sb(mddev
, 0);
5155 md_new_event(mddev
);
5156 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5157 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5158 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5161 EXPORT_SYMBOL_GPL(md_run
);
5163 static int do_md_run(struct mddev
*mddev
)
5167 err
= md_run(mddev
);
5170 err
= bitmap_load(mddev
);
5172 bitmap_destroy(mddev
);
5176 md_wakeup_thread(mddev
->thread
);
5177 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5179 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5180 revalidate_disk(mddev
->gendisk
);
5182 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5187 static int restart_array(struct mddev
*mddev
)
5189 struct gendisk
*disk
= mddev
->gendisk
;
5191 /* Complain if it has no devices */
5192 if (list_empty(&mddev
->disks
))
5198 mddev
->safemode
= 0;
5200 set_disk_ro(disk
, 0);
5201 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5203 /* Kick recovery or resync if necessary */
5204 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5205 md_wakeup_thread(mddev
->thread
);
5206 md_wakeup_thread(mddev
->sync_thread
);
5207 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5211 static void md_clean(struct mddev
*mddev
)
5213 mddev
->array_sectors
= 0;
5214 mddev
->external_size
= 0;
5215 mddev
->dev_sectors
= 0;
5216 mddev
->raid_disks
= 0;
5217 mddev
->recovery_cp
= 0;
5218 mddev
->resync_min
= 0;
5219 mddev
->resync_max
= MaxSector
;
5220 mddev
->reshape_position
= MaxSector
;
5221 mddev
->external
= 0;
5222 mddev
->persistent
= 0;
5223 mddev
->level
= LEVEL_NONE
;
5224 mddev
->clevel
[0] = 0;
5227 mddev
->metadata_type
[0] = 0;
5228 mddev
->chunk_sectors
= 0;
5229 mddev
->ctime
= mddev
->utime
= 0;
5231 mddev
->max_disks
= 0;
5233 mddev
->can_decrease_events
= 0;
5234 mddev
->delta_disks
= 0;
5235 mddev
->reshape_backwards
= 0;
5236 mddev
->new_level
= LEVEL_NONE
;
5237 mddev
->new_layout
= 0;
5238 mddev
->new_chunk_sectors
= 0;
5239 mddev
->curr_resync
= 0;
5240 atomic64_set(&mddev
->resync_mismatches
, 0);
5241 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5242 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5243 mddev
->recovery
= 0;
5246 mddev
->degraded
= 0;
5247 mddev
->safemode
= 0;
5248 mddev
->merge_check_needed
= 0;
5249 mddev
->bitmap_info
.offset
= 0;
5250 mddev
->bitmap_info
.default_offset
= 0;
5251 mddev
->bitmap_info
.default_space
= 0;
5252 mddev
->bitmap_info
.chunksize
= 0;
5253 mddev
->bitmap_info
.daemon_sleep
= 0;
5254 mddev
->bitmap_info
.max_write_behind
= 0;
5257 static void __md_stop_writes(struct mddev
*mddev
)
5259 if (mddev_is_clustered(mddev
))
5260 md_cluster_ops
->metadata_update_start(mddev
);
5261 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5262 flush_workqueue(md_misc_wq
);
5263 if (mddev
->sync_thread
) {
5264 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5265 md_reap_sync_thread(mddev
);
5268 del_timer_sync(&mddev
->safemode_timer
);
5270 bitmap_flush(mddev
);
5271 md_super_wait(mddev
);
5273 if (mddev
->ro
== 0 &&
5274 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5275 /* mark array as shutdown cleanly */
5277 md_update_sb(mddev
, 1);
5279 if (mddev_is_clustered(mddev
))
5280 md_cluster_ops
->metadata_update_finish(mddev
);
5283 void md_stop_writes(struct mddev
*mddev
)
5285 mddev_lock_nointr(mddev
);
5286 __md_stop_writes(mddev
);
5287 mddev_unlock(mddev
);
5289 EXPORT_SYMBOL_GPL(md_stop_writes
);
5291 static void mddev_detach(struct mddev
*mddev
)
5293 struct bitmap
*bitmap
= mddev
->bitmap
;
5294 /* wait for behind writes to complete */
5295 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5296 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5298 /* need to kick something here to make sure I/O goes? */
5299 wait_event(bitmap
->behind_wait
,
5300 atomic_read(&bitmap
->behind_writes
) == 0);
5302 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5303 mddev
->pers
->quiesce(mddev
, 1);
5304 mddev
->pers
->quiesce(mddev
, 0);
5306 md_unregister_thread(&mddev
->thread
);
5308 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5311 static void __md_stop(struct mddev
*mddev
)
5313 struct md_personality
*pers
= mddev
->pers
;
5314 mddev_detach(mddev
);
5315 spin_lock(&mddev
->lock
);
5318 spin_unlock(&mddev
->lock
);
5319 pers
->free(mddev
, mddev
->private);
5320 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5321 mddev
->to_remove
= &md_redundancy_group
;
5322 module_put(pers
->owner
);
5323 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5326 void md_stop(struct mddev
*mddev
)
5328 /* stop the array and free an attached data structures.
5329 * This is called from dm-raid
5332 bitmap_destroy(mddev
);
5334 bioset_free(mddev
->bio_set
);
5337 EXPORT_SYMBOL_GPL(md_stop
);
5339 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5344 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5346 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5347 md_wakeup_thread(mddev
->thread
);
5349 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5350 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5351 if (mddev
->sync_thread
)
5352 /* Thread might be blocked waiting for metadata update
5353 * which will now never happen */
5354 wake_up_process(mddev
->sync_thread
->tsk
);
5356 mddev_unlock(mddev
);
5357 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5359 mddev_lock_nointr(mddev
);
5361 mutex_lock(&mddev
->open_mutex
);
5362 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5363 mddev
->sync_thread
||
5364 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5365 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5366 printk("md: %s still in use.\n",mdname(mddev
));
5368 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5369 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5370 md_wakeup_thread(mddev
->thread
);
5376 __md_stop_writes(mddev
);
5382 set_disk_ro(mddev
->gendisk
, 1);
5383 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5384 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5385 md_wakeup_thread(mddev
->thread
);
5386 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5390 mutex_unlock(&mddev
->open_mutex
);
5395 * 0 - completely stop and dis-assemble array
5396 * 2 - stop but do not disassemble array
5398 static int do_md_stop(struct mddev
*mddev
, int mode
,
5399 struct block_device
*bdev
)
5401 struct gendisk
*disk
= mddev
->gendisk
;
5402 struct md_rdev
*rdev
;
5405 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5407 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5408 md_wakeup_thread(mddev
->thread
);
5410 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5411 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5412 if (mddev
->sync_thread
)
5413 /* Thread might be blocked waiting for metadata update
5414 * which will now never happen */
5415 wake_up_process(mddev
->sync_thread
->tsk
);
5417 mddev_unlock(mddev
);
5418 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5419 !test_bit(MD_RECOVERY_RUNNING
,
5420 &mddev
->recovery
)));
5421 mddev_lock_nointr(mddev
);
5423 mutex_lock(&mddev
->open_mutex
);
5424 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5425 mddev
->sysfs_active
||
5426 mddev
->sync_thread
||
5427 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5428 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5429 printk("md: %s still in use.\n",mdname(mddev
));
5430 mutex_unlock(&mddev
->open_mutex
);
5432 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5433 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5434 md_wakeup_thread(mddev
->thread
);
5440 set_disk_ro(disk
, 0);
5442 __md_stop_writes(mddev
);
5444 mddev
->queue
->merge_bvec_fn
= NULL
;
5445 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5447 /* tell userspace to handle 'inactive' */
5448 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5450 rdev_for_each(rdev
, mddev
)
5451 if (rdev
->raid_disk
>= 0)
5452 sysfs_unlink_rdev(mddev
, rdev
);
5454 set_capacity(disk
, 0);
5455 mutex_unlock(&mddev
->open_mutex
);
5457 revalidate_disk(disk
);
5462 mutex_unlock(&mddev
->open_mutex
);
5464 * Free resources if final stop
5467 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5469 bitmap_destroy(mddev
);
5470 if (mddev
->bitmap_info
.file
) {
5471 struct file
*f
= mddev
->bitmap_info
.file
;
5472 spin_lock(&mddev
->lock
);
5473 mddev
->bitmap_info
.file
= NULL
;
5474 spin_unlock(&mddev
->lock
);
5477 mddev
->bitmap_info
.offset
= 0;
5479 export_array(mddev
);
5482 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5483 if (mddev
->hold_active
== UNTIL_STOP
)
5484 mddev
->hold_active
= 0;
5486 blk_integrity_unregister(disk
);
5487 md_new_event(mddev
);
5488 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5493 static void autorun_array(struct mddev
*mddev
)
5495 struct md_rdev
*rdev
;
5498 if (list_empty(&mddev
->disks
))
5501 printk(KERN_INFO
"md: running: ");
5503 rdev_for_each(rdev
, mddev
) {
5504 char b
[BDEVNAME_SIZE
];
5505 printk("<%s>", bdevname(rdev
->bdev
,b
));
5509 err
= do_md_run(mddev
);
5511 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5512 do_md_stop(mddev
, 0, NULL
);
5517 * lets try to run arrays based on all disks that have arrived
5518 * until now. (those are in pending_raid_disks)
5520 * the method: pick the first pending disk, collect all disks with
5521 * the same UUID, remove all from the pending list and put them into
5522 * the 'same_array' list. Then order this list based on superblock
5523 * update time (freshest comes first), kick out 'old' disks and
5524 * compare superblocks. If everything's fine then run it.
5526 * If "unit" is allocated, then bump its reference count
5528 static void autorun_devices(int part
)
5530 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5531 struct mddev
*mddev
;
5532 char b
[BDEVNAME_SIZE
];
5534 printk(KERN_INFO
"md: autorun ...\n");
5535 while (!list_empty(&pending_raid_disks
)) {
5538 LIST_HEAD(candidates
);
5539 rdev0
= list_entry(pending_raid_disks
.next
,
5540 struct md_rdev
, same_set
);
5542 printk(KERN_INFO
"md: considering %s ...\n",
5543 bdevname(rdev0
->bdev
,b
));
5544 INIT_LIST_HEAD(&candidates
);
5545 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5546 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5547 printk(KERN_INFO
"md: adding %s ...\n",
5548 bdevname(rdev
->bdev
,b
));
5549 list_move(&rdev
->same_set
, &candidates
);
5552 * now we have a set of devices, with all of them having
5553 * mostly sane superblocks. It's time to allocate the
5557 dev
= MKDEV(mdp_major
,
5558 rdev0
->preferred_minor
<< MdpMinorShift
);
5559 unit
= MINOR(dev
) >> MdpMinorShift
;
5561 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5564 if (rdev0
->preferred_minor
!= unit
) {
5565 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5566 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5570 md_probe(dev
, NULL
, NULL
);
5571 mddev
= mddev_find(dev
);
5572 if (!mddev
|| !mddev
->gendisk
) {
5576 "md: cannot allocate memory for md drive.\n");
5579 if (mddev_lock(mddev
))
5580 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5582 else if (mddev
->raid_disks
|| mddev
->major_version
5583 || !list_empty(&mddev
->disks
)) {
5585 "md: %s already running, cannot run %s\n",
5586 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5587 mddev_unlock(mddev
);
5589 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5590 mddev
->persistent
= 1;
5591 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5592 list_del_init(&rdev
->same_set
);
5593 if (bind_rdev_to_array(rdev
, mddev
))
5596 autorun_array(mddev
);
5597 mddev_unlock(mddev
);
5599 /* on success, candidates will be empty, on error
5602 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5603 list_del_init(&rdev
->same_set
);
5608 printk(KERN_INFO
"md: ... autorun DONE.\n");
5610 #endif /* !MODULE */
5612 static int get_version(void __user
*arg
)
5616 ver
.major
= MD_MAJOR_VERSION
;
5617 ver
.minor
= MD_MINOR_VERSION
;
5618 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5620 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5626 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5628 mdu_array_info_t info
;
5629 int nr
,working
,insync
,failed
,spare
;
5630 struct md_rdev
*rdev
;
5632 nr
= working
= insync
= failed
= spare
= 0;
5634 rdev_for_each_rcu(rdev
, mddev
) {
5636 if (test_bit(Faulty
, &rdev
->flags
))
5640 if (test_bit(In_sync
, &rdev
->flags
))
5648 info
.major_version
= mddev
->major_version
;
5649 info
.minor_version
= mddev
->minor_version
;
5650 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5651 info
.ctime
= mddev
->ctime
;
5652 info
.level
= mddev
->level
;
5653 info
.size
= mddev
->dev_sectors
/ 2;
5654 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5657 info
.raid_disks
= mddev
->raid_disks
;
5658 info
.md_minor
= mddev
->md_minor
;
5659 info
.not_persistent
= !mddev
->persistent
;
5661 info
.utime
= mddev
->utime
;
5664 info
.state
= (1<<MD_SB_CLEAN
);
5665 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5666 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5667 if (mddev_is_clustered(mddev
))
5668 info
.state
|= (1<<MD_SB_CLUSTERED
);
5669 info
.active_disks
= insync
;
5670 info
.working_disks
= working
;
5671 info
.failed_disks
= failed
;
5672 info
.spare_disks
= spare
;
5674 info
.layout
= mddev
->layout
;
5675 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5677 if (copy_to_user(arg
, &info
, sizeof(info
)))
5683 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5685 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5689 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5694 spin_lock(&mddev
->lock
);
5695 /* bitmap disabled, zero the first byte and copy out */
5696 if (!mddev
->bitmap_info
.file
)
5697 file
->pathname
[0] = '\0';
5698 else if ((ptr
= d_path(&mddev
->bitmap_info
.file
->f_path
,
5699 file
->pathname
, sizeof(file
->pathname
))),
5703 memmove(file
->pathname
, ptr
,
5704 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5705 spin_unlock(&mddev
->lock
);
5708 copy_to_user(arg
, file
, sizeof(*file
)))
5715 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5717 mdu_disk_info_t info
;
5718 struct md_rdev
*rdev
;
5720 if (copy_from_user(&info
, arg
, sizeof(info
)))
5724 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5726 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5727 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5728 info
.raid_disk
= rdev
->raid_disk
;
5730 if (test_bit(Faulty
, &rdev
->flags
))
5731 info
.state
|= (1<<MD_DISK_FAULTY
);
5732 else if (test_bit(In_sync
, &rdev
->flags
)) {
5733 info
.state
|= (1<<MD_DISK_ACTIVE
);
5734 info
.state
|= (1<<MD_DISK_SYNC
);
5736 if (test_bit(WriteMostly
, &rdev
->flags
))
5737 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5739 info
.major
= info
.minor
= 0;
5740 info
.raid_disk
= -1;
5741 info
.state
= (1<<MD_DISK_REMOVED
);
5745 if (copy_to_user(arg
, &info
, sizeof(info
)))
5751 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5753 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5754 struct md_rdev
*rdev
;
5755 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5757 if (mddev_is_clustered(mddev
) &&
5758 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5759 pr_err("%s: Cannot add to clustered mddev.\n",
5764 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5767 if (!mddev
->raid_disks
) {
5769 /* expecting a device which has a superblock */
5770 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5773 "md: md_import_device returned %ld\n",
5775 return PTR_ERR(rdev
);
5777 if (!list_empty(&mddev
->disks
)) {
5778 struct md_rdev
*rdev0
5779 = list_entry(mddev
->disks
.next
,
5780 struct md_rdev
, same_set
);
5781 err
= super_types
[mddev
->major_version
]
5782 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5785 "md: %s has different UUID to %s\n",
5786 bdevname(rdev
->bdev
,b
),
5787 bdevname(rdev0
->bdev
,b2
));
5792 err
= bind_rdev_to_array(rdev
, mddev
);
5799 * add_new_disk can be used once the array is assembled
5800 * to add "hot spares". They must already have a superblock
5805 if (!mddev
->pers
->hot_add_disk
) {
5807 "%s: personality does not support diskops!\n",
5811 if (mddev
->persistent
)
5812 rdev
= md_import_device(dev
, mddev
->major_version
,
5813 mddev
->minor_version
);
5815 rdev
= md_import_device(dev
, -1, -1);
5818 "md: md_import_device returned %ld\n",
5820 return PTR_ERR(rdev
);
5822 /* set saved_raid_disk if appropriate */
5823 if (!mddev
->persistent
) {
5824 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5825 info
->raid_disk
< mddev
->raid_disks
) {
5826 rdev
->raid_disk
= info
->raid_disk
;
5827 set_bit(In_sync
, &rdev
->flags
);
5828 clear_bit(Bitmap_sync
, &rdev
->flags
);
5830 rdev
->raid_disk
= -1;
5831 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5833 super_types
[mddev
->major_version
].
5834 validate_super(mddev
, rdev
);
5835 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5836 rdev
->raid_disk
!= info
->raid_disk
) {
5837 /* This was a hot-add request, but events doesn't
5838 * match, so reject it.
5844 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5845 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5846 set_bit(WriteMostly
, &rdev
->flags
);
5848 clear_bit(WriteMostly
, &rdev
->flags
);
5851 * check whether the device shows up in other nodes
5853 if (mddev_is_clustered(mddev
)) {
5854 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
5855 /* Through --cluster-confirm */
5856 set_bit(Candidate
, &rdev
->flags
);
5857 err
= md_cluster_ops
->new_disk_ack(mddev
, true);
5862 } else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
5863 /* --add initiated by this node */
5864 err
= md_cluster_ops
->add_new_disk_start(mddev
, rdev
);
5866 md_cluster_ops
->add_new_disk_finish(mddev
);
5873 rdev
->raid_disk
= -1;
5874 err
= bind_rdev_to_array(rdev
, mddev
);
5875 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5876 /* If there is hot_add_disk but no hot_remove_disk
5877 * then added disks for geometry changes,
5878 * and should be added immediately.
5880 super_types
[mddev
->major_version
].
5881 validate_super(mddev
, rdev
);
5882 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5884 unbind_rdev_from_array(rdev
);
5889 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5891 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5892 if (mddev
->degraded
)
5893 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5894 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5896 md_new_event(mddev
);
5897 md_wakeup_thread(mddev
->thread
);
5898 if (mddev_is_clustered(mddev
) &&
5899 (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)))
5900 md_cluster_ops
->add_new_disk_finish(mddev
);
5904 /* otherwise, add_new_disk is only allowed
5905 * for major_version==0 superblocks
5907 if (mddev
->major_version
!= 0) {
5908 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5913 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5915 rdev
= md_import_device(dev
, -1, 0);
5918 "md: error, md_import_device() returned %ld\n",
5920 return PTR_ERR(rdev
);
5922 rdev
->desc_nr
= info
->number
;
5923 if (info
->raid_disk
< mddev
->raid_disks
)
5924 rdev
->raid_disk
= info
->raid_disk
;
5926 rdev
->raid_disk
= -1;
5928 if (rdev
->raid_disk
< mddev
->raid_disks
)
5929 if (info
->state
& (1<<MD_DISK_SYNC
))
5930 set_bit(In_sync
, &rdev
->flags
);
5932 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5933 set_bit(WriteMostly
, &rdev
->flags
);
5935 if (!mddev
->persistent
) {
5936 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5937 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5939 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5940 rdev
->sectors
= rdev
->sb_start
;
5942 err
= bind_rdev_to_array(rdev
, mddev
);
5952 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5954 char b
[BDEVNAME_SIZE
];
5955 struct md_rdev
*rdev
;
5957 rdev
= find_rdev(mddev
, dev
);
5961 if (mddev_is_clustered(mddev
))
5962 md_cluster_ops
->metadata_update_start(mddev
);
5964 clear_bit(Blocked
, &rdev
->flags
);
5965 remove_and_add_spares(mddev
, rdev
);
5967 if (rdev
->raid_disk
>= 0)
5970 md_kick_rdev_from_array(rdev
);
5971 md_update_sb(mddev
, 1);
5972 md_new_event(mddev
);
5974 if (mddev_is_clustered(mddev
))
5975 md_cluster_ops
->metadata_update_finish(mddev
);
5979 if (mddev_is_clustered(mddev
))
5980 md_cluster_ops
->metadata_update_cancel(mddev
);
5981 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5982 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5986 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5988 char b
[BDEVNAME_SIZE
];
5990 struct md_rdev
*rdev
;
5995 if (mddev
->major_version
!= 0) {
5996 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5997 " version-0 superblocks.\n",
6001 if (!mddev
->pers
->hot_add_disk
) {
6003 "%s: personality does not support diskops!\n",
6008 rdev
= md_import_device(dev
, -1, 0);
6011 "md: error, md_import_device() returned %ld\n",
6016 if (mddev
->persistent
)
6017 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6019 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6021 rdev
->sectors
= rdev
->sb_start
;
6023 if (test_bit(Faulty
, &rdev
->flags
)) {
6025 "md: can not hot-add faulty %s disk to %s!\n",
6026 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6031 if (mddev_is_clustered(mddev
))
6032 md_cluster_ops
->metadata_update_start(mddev
);
6033 clear_bit(In_sync
, &rdev
->flags
);
6035 rdev
->saved_raid_disk
= -1;
6036 err
= bind_rdev_to_array(rdev
, mddev
);
6038 goto abort_clustered
;
6041 * The rest should better be atomic, we can have disk failures
6042 * noticed in interrupt contexts ...
6045 rdev
->raid_disk
= -1;
6047 md_update_sb(mddev
, 1);
6049 if (mddev_is_clustered(mddev
))
6050 md_cluster_ops
->metadata_update_finish(mddev
);
6052 * Kick recovery, maybe this spare has to be added to the
6053 * array immediately.
6055 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6056 md_wakeup_thread(mddev
->thread
);
6057 md_new_event(mddev
);
6061 if (mddev_is_clustered(mddev
))
6062 md_cluster_ops
->metadata_update_cancel(mddev
);
6068 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6073 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6075 if (mddev
->recovery
|| mddev
->sync_thread
)
6077 /* we should be able to change the bitmap.. */
6081 struct inode
*inode
;
6084 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6085 return -EEXIST
; /* cannot add when bitmap is present */
6089 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6094 inode
= f
->f_mapping
->host
;
6095 if (!S_ISREG(inode
->i_mode
)) {
6096 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6099 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6100 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6103 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6104 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6112 mddev
->bitmap_info
.file
= f
;
6113 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6114 } else if (mddev
->bitmap
== NULL
)
6115 return -ENOENT
; /* cannot remove what isn't there */
6118 mddev
->pers
->quiesce(mddev
, 1);
6120 struct bitmap
*bitmap
;
6122 bitmap
= bitmap_create(mddev
, -1);
6123 if (!IS_ERR(bitmap
)) {
6124 mddev
->bitmap
= bitmap
;
6125 err
= bitmap_load(mddev
);
6127 err
= PTR_ERR(bitmap
);
6129 if (fd
< 0 || err
) {
6130 bitmap_destroy(mddev
);
6131 fd
= -1; /* make sure to put the file */
6133 mddev
->pers
->quiesce(mddev
, 0);
6136 struct file
*f
= mddev
->bitmap_info
.file
;
6138 spin_lock(&mddev
->lock
);
6139 mddev
->bitmap_info
.file
= NULL
;
6140 spin_unlock(&mddev
->lock
);
6149 * set_array_info is used two different ways
6150 * The original usage is when creating a new array.
6151 * In this usage, raid_disks is > 0 and it together with
6152 * level, size, not_persistent,layout,chunksize determine the
6153 * shape of the array.
6154 * This will always create an array with a type-0.90.0 superblock.
6155 * The newer usage is when assembling an array.
6156 * In this case raid_disks will be 0, and the major_version field is
6157 * use to determine which style super-blocks are to be found on the devices.
6158 * The minor and patch _version numbers are also kept incase the
6159 * super_block handler wishes to interpret them.
6161 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6164 if (info
->raid_disks
== 0) {
6165 /* just setting version number for superblock loading */
6166 if (info
->major_version
< 0 ||
6167 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6168 super_types
[info
->major_version
].name
== NULL
) {
6169 /* maybe try to auto-load a module? */
6171 "md: superblock version %d not known\n",
6172 info
->major_version
);
6175 mddev
->major_version
= info
->major_version
;
6176 mddev
->minor_version
= info
->minor_version
;
6177 mddev
->patch_version
= info
->patch_version
;
6178 mddev
->persistent
= !info
->not_persistent
;
6179 /* ensure mddev_put doesn't delete this now that there
6180 * is some minimal configuration.
6182 mddev
->ctime
= get_seconds();
6185 mddev
->major_version
= MD_MAJOR_VERSION
;
6186 mddev
->minor_version
= MD_MINOR_VERSION
;
6187 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6188 mddev
->ctime
= get_seconds();
6190 mddev
->level
= info
->level
;
6191 mddev
->clevel
[0] = 0;
6192 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6193 mddev
->raid_disks
= info
->raid_disks
;
6194 /* don't set md_minor, it is determined by which /dev/md* was
6197 if (info
->state
& (1<<MD_SB_CLEAN
))
6198 mddev
->recovery_cp
= MaxSector
;
6200 mddev
->recovery_cp
= 0;
6201 mddev
->persistent
= ! info
->not_persistent
;
6202 mddev
->external
= 0;
6204 mddev
->layout
= info
->layout
;
6205 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6207 mddev
->max_disks
= MD_SB_DISKS
;
6209 if (mddev
->persistent
)
6211 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6213 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6214 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6215 mddev
->bitmap_info
.offset
= 0;
6217 mddev
->reshape_position
= MaxSector
;
6220 * Generate a 128 bit UUID
6222 get_random_bytes(mddev
->uuid
, 16);
6224 mddev
->new_level
= mddev
->level
;
6225 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6226 mddev
->new_layout
= mddev
->layout
;
6227 mddev
->delta_disks
= 0;
6228 mddev
->reshape_backwards
= 0;
6233 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6235 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6237 if (mddev
->external_size
)
6240 mddev
->array_sectors
= array_sectors
;
6242 EXPORT_SYMBOL(md_set_array_sectors
);
6244 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6246 struct md_rdev
*rdev
;
6248 int fit
= (num_sectors
== 0);
6250 if (mddev
->pers
->resize
== NULL
)
6252 /* The "num_sectors" is the number of sectors of each device that
6253 * is used. This can only make sense for arrays with redundancy.
6254 * linear and raid0 always use whatever space is available. We can only
6255 * consider changing this number if no resync or reconstruction is
6256 * happening, and if the new size is acceptable. It must fit before the
6257 * sb_start or, if that is <data_offset, it must fit before the size
6258 * of each device. If num_sectors is zero, we find the largest size
6261 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6267 rdev_for_each(rdev
, mddev
) {
6268 sector_t avail
= rdev
->sectors
;
6270 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6271 num_sectors
= avail
;
6272 if (avail
< num_sectors
)
6275 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6277 revalidate_disk(mddev
->gendisk
);
6281 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6284 struct md_rdev
*rdev
;
6285 /* change the number of raid disks */
6286 if (mddev
->pers
->check_reshape
== NULL
)
6290 if (raid_disks
<= 0 ||
6291 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6293 if (mddev
->sync_thread
||
6294 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6295 mddev
->reshape_position
!= MaxSector
)
6298 rdev_for_each(rdev
, mddev
) {
6299 if (mddev
->raid_disks
< raid_disks
&&
6300 rdev
->data_offset
< rdev
->new_data_offset
)
6302 if (mddev
->raid_disks
> raid_disks
&&
6303 rdev
->data_offset
> rdev
->new_data_offset
)
6307 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6308 if (mddev
->delta_disks
< 0)
6309 mddev
->reshape_backwards
= 1;
6310 else if (mddev
->delta_disks
> 0)
6311 mddev
->reshape_backwards
= 0;
6313 rv
= mddev
->pers
->check_reshape(mddev
);
6315 mddev
->delta_disks
= 0;
6316 mddev
->reshape_backwards
= 0;
6322 * update_array_info is used to change the configuration of an
6324 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6325 * fields in the info are checked against the array.
6326 * Any differences that cannot be handled will cause an error.
6327 * Normally, only one change can be managed at a time.
6329 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6335 /* calculate expected state,ignoring low bits */
6336 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6337 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6339 if (mddev
->major_version
!= info
->major_version
||
6340 mddev
->minor_version
!= info
->minor_version
||
6341 /* mddev->patch_version != info->patch_version || */
6342 mddev
->ctime
!= info
->ctime
||
6343 mddev
->level
!= info
->level
||
6344 /* mddev->layout != info->layout || */
6345 !mddev
->persistent
!= info
->not_persistent
||
6346 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6347 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6348 ((state
^info
->state
) & 0xfffffe00)
6351 /* Check there is only one change */
6352 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6354 if (mddev
->raid_disks
!= info
->raid_disks
)
6356 if (mddev
->layout
!= info
->layout
)
6358 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6365 if (mddev
->layout
!= info
->layout
) {
6367 * we don't need to do anything at the md level, the
6368 * personality will take care of it all.
6370 if (mddev
->pers
->check_reshape
== NULL
)
6373 mddev
->new_layout
= info
->layout
;
6374 rv
= mddev
->pers
->check_reshape(mddev
);
6376 mddev
->new_layout
= mddev
->layout
;
6380 if (mddev_is_clustered(mddev
))
6381 md_cluster_ops
->metadata_update_start(mddev
);
6382 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6383 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6385 if (mddev
->raid_disks
!= info
->raid_disks
)
6386 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6388 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6389 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6393 if (mddev
->recovery
|| mddev
->sync_thread
) {
6397 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6398 struct bitmap
*bitmap
;
6399 /* add the bitmap */
6400 if (mddev
->bitmap
) {
6404 if (mddev
->bitmap_info
.default_offset
== 0) {
6408 mddev
->bitmap_info
.offset
=
6409 mddev
->bitmap_info
.default_offset
;
6410 mddev
->bitmap_info
.space
=
6411 mddev
->bitmap_info
.default_space
;
6412 mddev
->pers
->quiesce(mddev
, 1);
6413 bitmap
= bitmap_create(mddev
, -1);
6414 if (!IS_ERR(bitmap
)) {
6415 mddev
->bitmap
= bitmap
;
6416 rv
= bitmap_load(mddev
);
6418 rv
= PTR_ERR(bitmap
);
6420 bitmap_destroy(mddev
);
6421 mddev
->pers
->quiesce(mddev
, 0);
6423 /* remove the bitmap */
6424 if (!mddev
->bitmap
) {
6428 if (mddev
->bitmap
->storage
.file
) {
6432 mddev
->pers
->quiesce(mddev
, 1);
6433 bitmap_destroy(mddev
);
6434 mddev
->pers
->quiesce(mddev
, 0);
6435 mddev
->bitmap_info
.offset
= 0;
6438 md_update_sb(mddev
, 1);
6439 if (mddev_is_clustered(mddev
))
6440 md_cluster_ops
->metadata_update_finish(mddev
);
6443 if (mddev_is_clustered(mddev
))
6444 md_cluster_ops
->metadata_update_cancel(mddev
);
6448 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6450 struct md_rdev
*rdev
;
6453 if (mddev
->pers
== NULL
)
6457 rdev
= find_rdev_rcu(mddev
, dev
);
6461 md_error(mddev
, rdev
);
6462 if (!test_bit(Faulty
, &rdev
->flags
))
6470 * We have a problem here : there is no easy way to give a CHS
6471 * virtual geometry. We currently pretend that we have a 2 heads
6472 * 4 sectors (with a BIG number of cylinders...). This drives
6473 * dosfs just mad... ;-)
6475 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6477 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6481 geo
->cylinders
= mddev
->array_sectors
/ 8;
6485 static inline bool md_ioctl_valid(unsigned int cmd
)
6490 case GET_ARRAY_INFO
:
6491 case GET_BITMAP_FILE
:
6494 case HOT_REMOVE_DISK
:
6497 case RESTART_ARRAY_RW
:
6499 case SET_ARRAY_INFO
:
6500 case SET_BITMAP_FILE
:
6501 case SET_DISK_FAULTY
:
6504 case CLUSTERED_DISK_NACK
:
6511 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6512 unsigned int cmd
, unsigned long arg
)
6515 void __user
*argp
= (void __user
*)arg
;
6516 struct mddev
*mddev
= NULL
;
6519 if (!md_ioctl_valid(cmd
))
6524 case GET_ARRAY_INFO
:
6528 if (!capable(CAP_SYS_ADMIN
))
6533 * Commands dealing with the RAID driver but not any
6538 err
= get_version(argp
);
6544 autostart_arrays(arg
);
6551 * Commands creating/starting a new array:
6554 mddev
= bdev
->bd_disk
->private_data
;
6561 /* Some actions do not requires the mutex */
6563 case GET_ARRAY_INFO
:
6564 if (!mddev
->raid_disks
&& !mddev
->external
)
6567 err
= get_array_info(mddev
, argp
);
6571 if (!mddev
->raid_disks
&& !mddev
->external
)
6574 err
= get_disk_info(mddev
, argp
);
6577 case SET_DISK_FAULTY
:
6578 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6581 case GET_BITMAP_FILE
:
6582 err
= get_bitmap_file(mddev
, argp
);
6587 if (cmd
== ADD_NEW_DISK
)
6588 /* need to ensure md_delayed_delete() has completed */
6589 flush_workqueue(md_misc_wq
);
6591 if (cmd
== HOT_REMOVE_DISK
)
6592 /* need to ensure recovery thread has run */
6593 wait_event_interruptible_timeout(mddev
->sb_wait
,
6594 !test_bit(MD_RECOVERY_NEEDED
,
6596 msecs_to_jiffies(5000));
6597 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6598 /* Need to flush page cache, and ensure no-one else opens
6601 mutex_lock(&mddev
->open_mutex
);
6602 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6603 mutex_unlock(&mddev
->open_mutex
);
6607 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6608 mutex_unlock(&mddev
->open_mutex
);
6609 sync_blockdev(bdev
);
6611 err
= mddev_lock(mddev
);
6614 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6619 if (cmd
== SET_ARRAY_INFO
) {
6620 mdu_array_info_t info
;
6622 memset(&info
, 0, sizeof(info
));
6623 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6628 err
= update_array_info(mddev
, &info
);
6630 printk(KERN_WARNING
"md: couldn't update"
6631 " array info. %d\n", err
);
6636 if (!list_empty(&mddev
->disks
)) {
6638 "md: array %s already has disks!\n",
6643 if (mddev
->raid_disks
) {
6645 "md: array %s already initialised!\n",
6650 err
= set_array_info(mddev
, &info
);
6652 printk(KERN_WARNING
"md: couldn't set"
6653 " array info. %d\n", err
);
6660 * Commands querying/configuring an existing array:
6662 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6663 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6664 if ((!mddev
->raid_disks
&& !mddev
->external
)
6665 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6666 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6667 && cmd
!= GET_BITMAP_FILE
) {
6673 * Commands even a read-only array can execute:
6676 case RESTART_ARRAY_RW
:
6677 err
= restart_array(mddev
);
6681 err
= do_md_stop(mddev
, 0, bdev
);
6685 err
= md_set_readonly(mddev
, bdev
);
6688 case HOT_REMOVE_DISK
:
6689 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6693 /* We can support ADD_NEW_DISK on read-only arrays
6694 * on if we are re-adding a preexisting device.
6695 * So require mddev->pers and MD_DISK_SYNC.
6698 mdu_disk_info_t info
;
6699 if (copy_from_user(&info
, argp
, sizeof(info
)))
6701 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6702 /* Need to clear read-only for this */
6705 err
= add_new_disk(mddev
, &info
);
6711 if (get_user(ro
, (int __user
*)(arg
))) {
6717 /* if the bdev is going readonly the value of mddev->ro
6718 * does not matter, no writes are coming
6723 /* are we are already prepared for writes? */
6727 /* transitioning to readauto need only happen for
6728 * arrays that call md_write_start
6731 err
= restart_array(mddev
);
6734 set_disk_ro(mddev
->gendisk
, 0);
6741 * The remaining ioctls are changing the state of the
6742 * superblock, so we do not allow them on read-only arrays.
6744 if (mddev
->ro
&& mddev
->pers
) {
6745 if (mddev
->ro
== 2) {
6747 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6748 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6749 /* mddev_unlock will wake thread */
6750 /* If a device failed while we were read-only, we
6751 * need to make sure the metadata is updated now.
6753 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6754 mddev_unlock(mddev
);
6755 wait_event(mddev
->sb_wait
,
6756 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6757 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6758 mddev_lock_nointr(mddev
);
6769 mdu_disk_info_t info
;
6770 if (copy_from_user(&info
, argp
, sizeof(info
)))
6773 err
= add_new_disk(mddev
, &info
);
6777 case CLUSTERED_DISK_NACK
:
6778 if (mddev_is_clustered(mddev
))
6779 md_cluster_ops
->new_disk_ack(mddev
, false);
6785 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6789 err
= do_md_run(mddev
);
6792 case SET_BITMAP_FILE
:
6793 err
= set_bitmap_file(mddev
, (int)arg
);
6802 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6804 mddev
->hold_active
= 0;
6805 mddev_unlock(mddev
);
6809 #ifdef CONFIG_COMPAT
6810 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6811 unsigned int cmd
, unsigned long arg
)
6814 case HOT_REMOVE_DISK
:
6816 case SET_DISK_FAULTY
:
6817 case SET_BITMAP_FILE
:
6818 /* These take in integer arg, do not convert */
6821 arg
= (unsigned long)compat_ptr(arg
);
6825 return md_ioctl(bdev
, mode
, cmd
, arg
);
6827 #endif /* CONFIG_COMPAT */
6829 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6832 * Succeed if we can lock the mddev, which confirms that
6833 * it isn't being stopped right now.
6835 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6841 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6842 /* we are racing with mddev_put which is discarding this
6846 /* Wait until bdev->bd_disk is definitely gone */
6847 flush_workqueue(md_misc_wq
);
6848 /* Then retry the open from the top */
6849 return -ERESTARTSYS
;
6851 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6853 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6857 atomic_inc(&mddev
->openers
);
6858 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6859 mutex_unlock(&mddev
->open_mutex
);
6861 check_disk_change(bdev
);
6866 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6868 struct mddev
*mddev
= disk
->private_data
;
6871 atomic_dec(&mddev
->openers
);
6875 static int md_media_changed(struct gendisk
*disk
)
6877 struct mddev
*mddev
= disk
->private_data
;
6879 return mddev
->changed
;
6882 static int md_revalidate(struct gendisk
*disk
)
6884 struct mddev
*mddev
= disk
->private_data
;
6889 static const struct block_device_operations md_fops
=
6891 .owner
= THIS_MODULE
,
6893 .release
= md_release
,
6895 #ifdef CONFIG_COMPAT
6896 .compat_ioctl
= md_compat_ioctl
,
6898 .getgeo
= md_getgeo
,
6899 .media_changed
= md_media_changed
,
6900 .revalidate_disk
= md_revalidate
,
6903 static int md_thread(void *arg
)
6905 struct md_thread
*thread
= arg
;
6908 * md_thread is a 'system-thread', it's priority should be very
6909 * high. We avoid resource deadlocks individually in each
6910 * raid personality. (RAID5 does preallocation) We also use RR and
6911 * the very same RT priority as kswapd, thus we will never get
6912 * into a priority inversion deadlock.
6914 * we definitely have to have equal or higher priority than
6915 * bdflush, otherwise bdflush will deadlock if there are too
6916 * many dirty RAID5 blocks.
6919 allow_signal(SIGKILL
);
6920 while (!kthread_should_stop()) {
6922 /* We need to wait INTERRUPTIBLE so that
6923 * we don't add to the load-average.
6924 * That means we need to be sure no signals are
6927 if (signal_pending(current
))
6928 flush_signals(current
);
6930 wait_event_interruptible_timeout
6932 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6933 || kthread_should_stop(),
6936 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6937 if (!kthread_should_stop())
6938 thread
->run(thread
);
6944 void md_wakeup_thread(struct md_thread
*thread
)
6947 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6948 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6949 wake_up(&thread
->wqueue
);
6952 EXPORT_SYMBOL(md_wakeup_thread
);
6954 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6955 struct mddev
*mddev
, const char *name
)
6957 struct md_thread
*thread
;
6959 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6963 init_waitqueue_head(&thread
->wqueue
);
6966 thread
->mddev
= mddev
;
6967 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6968 thread
->tsk
= kthread_run(md_thread
, thread
,
6970 mdname(thread
->mddev
),
6972 if (IS_ERR(thread
->tsk
)) {
6978 EXPORT_SYMBOL(md_register_thread
);
6980 void md_unregister_thread(struct md_thread
**threadp
)
6982 struct md_thread
*thread
= *threadp
;
6985 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6986 /* Locking ensures that mddev_unlock does not wake_up a
6987 * non-existent thread
6989 spin_lock(&pers_lock
);
6991 spin_unlock(&pers_lock
);
6993 kthread_stop(thread
->tsk
);
6996 EXPORT_SYMBOL(md_unregister_thread
);
6998 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7000 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7003 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7005 mddev
->pers
->error_handler(mddev
,rdev
);
7006 if (mddev
->degraded
)
7007 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7008 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7009 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7010 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7011 md_wakeup_thread(mddev
->thread
);
7012 if (mddev
->event_work
.func
)
7013 queue_work(md_misc_wq
, &mddev
->event_work
);
7014 md_new_event_inintr(mddev
);
7016 EXPORT_SYMBOL(md_error
);
7018 /* seq_file implementation /proc/mdstat */
7020 static void status_unused(struct seq_file
*seq
)
7023 struct md_rdev
*rdev
;
7025 seq_printf(seq
, "unused devices: ");
7027 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7028 char b
[BDEVNAME_SIZE
];
7030 seq_printf(seq
, "%s ",
7031 bdevname(rdev
->bdev
,b
));
7034 seq_printf(seq
, "<none>");
7036 seq_printf(seq
, "\n");
7039 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7041 sector_t max_sectors
, resync
, res
;
7042 unsigned long dt
, db
;
7045 unsigned int per_milli
;
7047 if (mddev
->curr_resync
<= 3)
7050 resync
= mddev
->curr_resync
7051 - atomic_read(&mddev
->recovery_active
);
7053 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7054 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7055 max_sectors
= mddev
->resync_max_sectors
;
7057 max_sectors
= mddev
->dev_sectors
;
7059 WARN_ON(max_sectors
== 0);
7060 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7061 * in a sector_t, and (max_sectors>>scale) will fit in a
7062 * u32, as those are the requirements for sector_div.
7063 * Thus 'scale' must be at least 10
7066 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7067 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7070 res
= (resync
>>scale
)*1000;
7071 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7075 int i
, x
= per_milli
/50, y
= 20-x
;
7076 seq_printf(seq
, "[");
7077 for (i
= 0; i
< x
; i
++)
7078 seq_printf(seq
, "=");
7079 seq_printf(seq
, ">");
7080 for (i
= 0; i
< y
; i
++)
7081 seq_printf(seq
, ".");
7082 seq_printf(seq
, "] ");
7084 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7085 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7087 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7089 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7090 "resync" : "recovery"))),
7091 per_milli
/10, per_milli
% 10,
7092 (unsigned long long) resync
/2,
7093 (unsigned long long) max_sectors
/2);
7096 * dt: time from mark until now
7097 * db: blocks written from mark until now
7098 * rt: remaining time
7100 * rt is a sector_t, so could be 32bit or 64bit.
7101 * So we divide before multiply in case it is 32bit and close
7103 * We scale the divisor (db) by 32 to avoid losing precision
7104 * near the end of resync when the number of remaining sectors
7106 * We then divide rt by 32 after multiplying by db to compensate.
7107 * The '+1' avoids division by zero if db is very small.
7109 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7111 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7112 - mddev
->resync_mark_cnt
;
7114 rt
= max_sectors
- resync
; /* number of remaining sectors */
7115 sector_div(rt
, db
/32+1);
7119 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7120 ((unsigned long)rt
% 60)/6);
7122 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7125 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7127 struct list_head
*tmp
;
7129 struct mddev
*mddev
;
7137 spin_lock(&all_mddevs_lock
);
7138 list_for_each(tmp
,&all_mddevs
)
7140 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7142 spin_unlock(&all_mddevs_lock
);
7145 spin_unlock(&all_mddevs_lock
);
7147 return (void*)2;/* tail */
7151 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7153 struct list_head
*tmp
;
7154 struct mddev
*next_mddev
, *mddev
= v
;
7160 spin_lock(&all_mddevs_lock
);
7162 tmp
= all_mddevs
.next
;
7164 tmp
= mddev
->all_mddevs
.next
;
7165 if (tmp
!= &all_mddevs
)
7166 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7168 next_mddev
= (void*)2;
7171 spin_unlock(&all_mddevs_lock
);
7179 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7181 struct mddev
*mddev
= v
;
7183 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7187 static int md_seq_show(struct seq_file
*seq
, void *v
)
7189 struct mddev
*mddev
= v
;
7191 struct md_rdev
*rdev
;
7193 if (v
== (void*)1) {
7194 struct md_personality
*pers
;
7195 seq_printf(seq
, "Personalities : ");
7196 spin_lock(&pers_lock
);
7197 list_for_each_entry(pers
, &pers_list
, list
)
7198 seq_printf(seq
, "[%s] ", pers
->name
);
7200 spin_unlock(&pers_lock
);
7201 seq_printf(seq
, "\n");
7202 seq
->poll_event
= atomic_read(&md_event_count
);
7205 if (v
== (void*)2) {
7210 spin_lock(&mddev
->lock
);
7211 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7212 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7213 mddev
->pers
? "" : "in");
7216 seq_printf(seq
, " (read-only)");
7218 seq_printf(seq
, " (auto-read-only)");
7219 seq_printf(seq
, " %s", mddev
->pers
->name
);
7224 rdev_for_each_rcu(rdev
, mddev
) {
7225 char b
[BDEVNAME_SIZE
];
7226 seq_printf(seq
, " %s[%d]",
7227 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7228 if (test_bit(WriteMostly
, &rdev
->flags
))
7229 seq_printf(seq
, "(W)");
7230 if (test_bit(Faulty
, &rdev
->flags
)) {
7231 seq_printf(seq
, "(F)");
7234 if (rdev
->raid_disk
< 0)
7235 seq_printf(seq
, "(S)"); /* spare */
7236 if (test_bit(Replacement
, &rdev
->flags
))
7237 seq_printf(seq
, "(R)");
7238 sectors
+= rdev
->sectors
;
7242 if (!list_empty(&mddev
->disks
)) {
7244 seq_printf(seq
, "\n %llu blocks",
7245 (unsigned long long)
7246 mddev
->array_sectors
/ 2);
7248 seq_printf(seq
, "\n %llu blocks",
7249 (unsigned long long)sectors
/ 2);
7251 if (mddev
->persistent
) {
7252 if (mddev
->major_version
!= 0 ||
7253 mddev
->minor_version
!= 90) {
7254 seq_printf(seq
," super %d.%d",
7255 mddev
->major_version
,
7256 mddev
->minor_version
);
7258 } else if (mddev
->external
)
7259 seq_printf(seq
, " super external:%s",
7260 mddev
->metadata_type
);
7262 seq_printf(seq
, " super non-persistent");
7265 mddev
->pers
->status(seq
, mddev
);
7266 seq_printf(seq
, "\n ");
7267 if (mddev
->pers
->sync_request
) {
7268 if (mddev
->curr_resync
> 2) {
7269 status_resync(seq
, mddev
);
7270 seq_printf(seq
, "\n ");
7271 } else if (mddev
->curr_resync
>= 1)
7272 seq_printf(seq
, "\tresync=DELAYED\n ");
7273 else if (mddev
->recovery_cp
< MaxSector
)
7274 seq_printf(seq
, "\tresync=PENDING\n ");
7277 seq_printf(seq
, "\n ");
7279 bitmap_status(seq
, mddev
->bitmap
);
7281 seq_printf(seq
, "\n");
7283 spin_unlock(&mddev
->lock
);
7288 static const struct seq_operations md_seq_ops
= {
7289 .start
= md_seq_start
,
7290 .next
= md_seq_next
,
7291 .stop
= md_seq_stop
,
7292 .show
= md_seq_show
,
7295 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7297 struct seq_file
*seq
;
7300 error
= seq_open(file
, &md_seq_ops
);
7304 seq
= file
->private_data
;
7305 seq
->poll_event
= atomic_read(&md_event_count
);
7309 static int md_unloading
;
7310 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7312 struct seq_file
*seq
= filp
->private_data
;
7316 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7317 poll_wait(filp
, &md_event_waiters
, wait
);
7319 /* always allow read */
7320 mask
= POLLIN
| POLLRDNORM
;
7322 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7323 mask
|= POLLERR
| POLLPRI
;
7327 static const struct file_operations md_seq_fops
= {
7328 .owner
= THIS_MODULE
,
7329 .open
= md_seq_open
,
7331 .llseek
= seq_lseek
,
7332 .release
= seq_release_private
,
7333 .poll
= mdstat_poll
,
7336 int register_md_personality(struct md_personality
*p
)
7338 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7340 spin_lock(&pers_lock
);
7341 list_add_tail(&p
->list
, &pers_list
);
7342 spin_unlock(&pers_lock
);
7345 EXPORT_SYMBOL(register_md_personality
);
7347 int unregister_md_personality(struct md_personality
*p
)
7349 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7350 spin_lock(&pers_lock
);
7351 list_del_init(&p
->list
);
7352 spin_unlock(&pers_lock
);
7355 EXPORT_SYMBOL(unregister_md_personality
);
7357 int register_md_cluster_operations(struct md_cluster_operations
*ops
, struct module
*module
)
7359 if (md_cluster_ops
!= NULL
)
7361 spin_lock(&pers_lock
);
7362 md_cluster_ops
= ops
;
7363 md_cluster_mod
= module
;
7364 spin_unlock(&pers_lock
);
7367 EXPORT_SYMBOL(register_md_cluster_operations
);
7369 int unregister_md_cluster_operations(void)
7371 spin_lock(&pers_lock
);
7372 md_cluster_ops
= NULL
;
7373 spin_unlock(&pers_lock
);
7376 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7378 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7382 err
= request_module("md-cluster");
7384 pr_err("md-cluster module not found.\n");
7388 spin_lock(&pers_lock
);
7389 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7390 spin_unlock(&pers_lock
);
7393 spin_unlock(&pers_lock
);
7395 return md_cluster_ops
->join(mddev
, nodes
);
7398 void md_cluster_stop(struct mddev
*mddev
)
7400 if (!md_cluster_ops
)
7402 md_cluster_ops
->leave(mddev
);
7403 module_put(md_cluster_mod
);
7406 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7408 struct md_rdev
*rdev
;
7414 rdev_for_each_rcu(rdev
, mddev
) {
7415 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7416 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7417 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7418 atomic_read(&disk
->sync_io
);
7419 /* sync IO will cause sync_io to increase before the disk_stats
7420 * as sync_io is counted when a request starts, and
7421 * disk_stats is counted when it completes.
7422 * So resync activity will cause curr_events to be smaller than
7423 * when there was no such activity.
7424 * non-sync IO will cause disk_stat to increase without
7425 * increasing sync_io so curr_events will (eventually)
7426 * be larger than it was before. Once it becomes
7427 * substantially larger, the test below will cause
7428 * the array to appear non-idle, and resync will slow
7430 * If there is a lot of outstanding resync activity when
7431 * we set last_event to curr_events, then all that activity
7432 * completing might cause the array to appear non-idle
7433 * and resync will be slowed down even though there might
7434 * not have been non-resync activity. This will only
7435 * happen once though. 'last_events' will soon reflect
7436 * the state where there is little or no outstanding
7437 * resync requests, and further resync activity will
7438 * always make curr_events less than last_events.
7441 if (init
|| curr_events
- rdev
->last_events
> 64) {
7442 rdev
->last_events
= curr_events
;
7450 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7452 /* another "blocks" (512byte) blocks have been synced */
7453 atomic_sub(blocks
, &mddev
->recovery_active
);
7454 wake_up(&mddev
->recovery_wait
);
7456 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7457 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7458 md_wakeup_thread(mddev
->thread
);
7459 // stop recovery, signal do_sync ....
7462 EXPORT_SYMBOL(md_done_sync
);
7464 /* md_write_start(mddev, bi)
7465 * If we need to update some array metadata (e.g. 'active' flag
7466 * in superblock) before writing, schedule a superblock update
7467 * and wait for it to complete.
7469 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7472 if (bio_data_dir(bi
) != WRITE
)
7475 BUG_ON(mddev
->ro
== 1);
7476 if (mddev
->ro
== 2) {
7477 /* need to switch to read/write */
7479 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7480 md_wakeup_thread(mddev
->thread
);
7481 md_wakeup_thread(mddev
->sync_thread
);
7484 atomic_inc(&mddev
->writes_pending
);
7485 if (mddev
->safemode
== 1)
7486 mddev
->safemode
= 0;
7487 if (mddev
->in_sync
) {
7488 spin_lock(&mddev
->lock
);
7489 if (mddev
->in_sync
) {
7491 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7492 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7493 md_wakeup_thread(mddev
->thread
);
7496 spin_unlock(&mddev
->lock
);
7499 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7500 wait_event(mddev
->sb_wait
,
7501 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7503 EXPORT_SYMBOL(md_write_start
);
7505 void md_write_end(struct mddev
*mddev
)
7507 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7508 if (mddev
->safemode
== 2)
7509 md_wakeup_thread(mddev
->thread
);
7510 else if (mddev
->safemode_delay
)
7511 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7514 EXPORT_SYMBOL(md_write_end
);
7516 /* md_allow_write(mddev)
7517 * Calling this ensures that the array is marked 'active' so that writes
7518 * may proceed without blocking. It is important to call this before
7519 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7520 * Must be called with mddev_lock held.
7522 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7523 * is dropped, so return -EAGAIN after notifying userspace.
7525 int md_allow_write(struct mddev
*mddev
)
7531 if (!mddev
->pers
->sync_request
)
7534 spin_lock(&mddev
->lock
);
7535 if (mddev
->in_sync
) {
7537 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7538 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7539 if (mddev
->safemode_delay
&&
7540 mddev
->safemode
== 0)
7541 mddev
->safemode
= 1;
7542 spin_unlock(&mddev
->lock
);
7543 if (mddev_is_clustered(mddev
))
7544 md_cluster_ops
->metadata_update_start(mddev
);
7545 md_update_sb(mddev
, 0);
7546 if (mddev_is_clustered(mddev
))
7547 md_cluster_ops
->metadata_update_finish(mddev
);
7548 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7550 spin_unlock(&mddev
->lock
);
7552 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7557 EXPORT_SYMBOL_GPL(md_allow_write
);
7559 #define SYNC_MARKS 10
7560 #define SYNC_MARK_STEP (3*HZ)
7561 #define UPDATE_FREQUENCY (5*60*HZ)
7562 void md_do_sync(struct md_thread
*thread
)
7564 struct mddev
*mddev
= thread
->mddev
;
7565 struct mddev
*mddev2
;
7566 unsigned int currspeed
= 0,
7568 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7569 unsigned long mark
[SYNC_MARKS
];
7570 unsigned long update_time
;
7571 sector_t mark_cnt
[SYNC_MARKS
];
7573 struct list_head
*tmp
;
7574 sector_t last_check
;
7576 struct md_rdev
*rdev
;
7577 char *desc
, *action
= NULL
;
7578 struct blk_plug plug
;
7580 /* just incase thread restarts... */
7581 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7583 if (mddev
->ro
) {/* never try to sync a read-only array */
7584 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7588 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7589 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7590 desc
= "data-check";
7592 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7593 desc
= "requested-resync";
7597 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7602 mddev
->last_sync_action
= action
?: desc
;
7604 /* we overload curr_resync somewhat here.
7605 * 0 == not engaged in resync at all
7606 * 2 == checking that there is no conflict with another sync
7607 * 1 == like 2, but have yielded to allow conflicting resync to
7609 * other == active in resync - this many blocks
7611 * Before starting a resync we must have set curr_resync to
7612 * 2, and then checked that every "conflicting" array has curr_resync
7613 * less than ours. When we find one that is the same or higher
7614 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7615 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7616 * This will mean we have to start checking from the beginning again.
7621 mddev
->curr_resync
= 2;
7624 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7626 for_each_mddev(mddev2
, tmp
) {
7627 if (mddev2
== mddev
)
7629 if (!mddev
->parallel_resync
7630 && mddev2
->curr_resync
7631 && match_mddev_units(mddev
, mddev2
)) {
7633 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7634 /* arbitrarily yield */
7635 mddev
->curr_resync
= 1;
7636 wake_up(&resync_wait
);
7638 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7639 /* no need to wait here, we can wait the next
7640 * time 'round when curr_resync == 2
7643 /* We need to wait 'interruptible' so as not to
7644 * contribute to the load average, and not to
7645 * be caught by 'softlockup'
7647 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7648 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7649 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7650 printk(KERN_INFO
"md: delaying %s of %s"
7651 " until %s has finished (they"
7652 " share one or more physical units)\n",
7653 desc
, mdname(mddev
), mdname(mddev2
));
7655 if (signal_pending(current
))
7656 flush_signals(current
);
7658 finish_wait(&resync_wait
, &wq
);
7661 finish_wait(&resync_wait
, &wq
);
7664 } while (mddev
->curr_resync
< 2);
7667 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7668 /* resync follows the size requested by the personality,
7669 * which defaults to physical size, but can be virtual size
7671 max_sectors
= mddev
->resync_max_sectors
;
7672 atomic64_set(&mddev
->resync_mismatches
, 0);
7673 /* we don't use the checkpoint if there's a bitmap */
7674 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7675 j
= mddev
->resync_min
;
7676 else if (!mddev
->bitmap
)
7677 j
= mddev
->recovery_cp
;
7679 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7680 max_sectors
= mddev
->resync_max_sectors
;
7682 /* recovery follows the physical size of devices */
7683 max_sectors
= mddev
->dev_sectors
;
7686 rdev_for_each_rcu(rdev
, mddev
)
7687 if (rdev
->raid_disk
>= 0 &&
7688 !test_bit(Faulty
, &rdev
->flags
) &&
7689 !test_bit(In_sync
, &rdev
->flags
) &&
7690 rdev
->recovery_offset
< j
)
7691 j
= rdev
->recovery_offset
;
7694 /* If there is a bitmap, we need to make sure all
7695 * writes that started before we added a spare
7696 * complete before we start doing a recovery.
7697 * Otherwise the write might complete and (via
7698 * bitmap_endwrite) set a bit in the bitmap after the
7699 * recovery has checked that bit and skipped that
7702 if (mddev
->bitmap
) {
7703 mddev
->pers
->quiesce(mddev
, 1);
7704 mddev
->pers
->quiesce(mddev
, 0);
7708 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7709 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7710 " %d KB/sec/disk.\n", speed_min(mddev
));
7711 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7712 "(but not more than %d KB/sec) for %s.\n",
7713 speed_max(mddev
), desc
);
7715 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7718 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7720 mark_cnt
[m
] = io_sectors
;
7723 mddev
->resync_mark
= mark
[last_mark
];
7724 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7727 * Tune reconstruction:
7729 window
= 32*(PAGE_SIZE
/512);
7730 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7731 window
/2, (unsigned long long)max_sectors
/2);
7733 atomic_set(&mddev
->recovery_active
, 0);
7738 "md: resuming %s of %s from checkpoint.\n",
7739 desc
, mdname(mddev
));
7740 mddev
->curr_resync
= j
;
7742 mddev
->curr_resync
= 3; /* no longer delayed */
7743 mddev
->curr_resync_completed
= j
;
7744 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7745 md_new_event(mddev
);
7746 update_time
= jiffies
;
7748 if (mddev_is_clustered(mddev
))
7749 md_cluster_ops
->resync_start(mddev
, j
, max_sectors
);
7751 blk_start_plug(&plug
);
7752 while (j
< max_sectors
) {
7757 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7758 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7759 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7760 > (max_sectors
>> 4)) ||
7761 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7762 (j
- mddev
->curr_resync_completed
)*2
7763 >= mddev
->resync_max
- mddev
->curr_resync_completed
7765 /* time to update curr_resync_completed */
7766 wait_event(mddev
->recovery_wait
,
7767 atomic_read(&mddev
->recovery_active
) == 0);
7768 mddev
->curr_resync_completed
= j
;
7769 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7770 j
> mddev
->recovery_cp
)
7771 mddev
->recovery_cp
= j
;
7772 update_time
= jiffies
;
7773 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7774 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7777 while (j
>= mddev
->resync_max
&&
7778 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7779 /* As this condition is controlled by user-space,
7780 * we can block indefinitely, so use '_interruptible'
7781 * to avoid triggering warnings.
7783 flush_signals(current
); /* just in case */
7784 wait_event_interruptible(mddev
->recovery_wait
,
7785 mddev
->resync_max
> j
7786 || test_bit(MD_RECOVERY_INTR
,
7790 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7793 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7794 currspeed
< speed_min(mddev
));
7796 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7800 if (!skipped
) { /* actual IO requested */
7801 io_sectors
+= sectors
;
7802 atomic_add(sectors
, &mddev
->recovery_active
);
7805 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7810 mddev
->curr_resync
= j
;
7811 if (mddev_is_clustered(mddev
))
7812 md_cluster_ops
->resync_info_update(mddev
, j
, max_sectors
);
7813 mddev
->curr_mark_cnt
= io_sectors
;
7814 if (last_check
== 0)
7815 /* this is the earliest that rebuild will be
7816 * visible in /proc/mdstat
7818 md_new_event(mddev
);
7820 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7823 last_check
= io_sectors
;
7825 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7827 int next
= (last_mark
+1) % SYNC_MARKS
;
7829 mddev
->resync_mark
= mark
[next
];
7830 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7831 mark
[next
] = jiffies
;
7832 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7836 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7840 * this loop exits only if either when we are slower than
7841 * the 'hard' speed limit, or the system was IO-idle for
7843 * the system might be non-idle CPU-wise, but we only care
7844 * about not overloading the IO subsystem. (things like an
7845 * e2fsck being done on the RAID array should execute fast)
7849 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7850 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7851 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7853 if (currspeed
> speed_min(mddev
)) {
7854 if ((currspeed
> speed_max(mddev
)) ||
7855 !is_mddev_idle(mddev
, 0)) {
7861 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7862 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7863 ? "interrupted" : "done");
7865 * this also signals 'finished resyncing' to md_stop
7867 blk_finish_plug(&plug
);
7868 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7870 /* tell personality that we are finished */
7871 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7873 if (mddev_is_clustered(mddev
))
7874 md_cluster_ops
->resync_finish(mddev
);
7876 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7877 mddev
->curr_resync
> 2) {
7878 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7879 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7880 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7882 "md: checkpointing %s of %s.\n",
7883 desc
, mdname(mddev
));
7884 if (test_bit(MD_RECOVERY_ERROR
,
7886 mddev
->recovery_cp
=
7887 mddev
->curr_resync_completed
;
7889 mddev
->recovery_cp
=
7893 mddev
->recovery_cp
= MaxSector
;
7895 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7896 mddev
->curr_resync
= MaxSector
;
7898 rdev_for_each_rcu(rdev
, mddev
)
7899 if (rdev
->raid_disk
>= 0 &&
7900 mddev
->delta_disks
>= 0 &&
7901 !test_bit(Faulty
, &rdev
->flags
) &&
7902 !test_bit(In_sync
, &rdev
->flags
) &&
7903 rdev
->recovery_offset
< mddev
->curr_resync
)
7904 rdev
->recovery_offset
= mddev
->curr_resync
;
7909 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7911 spin_lock(&mddev
->lock
);
7912 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7913 /* We completed so min/max setting can be forgotten if used. */
7914 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7915 mddev
->resync_min
= 0;
7916 mddev
->resync_max
= MaxSector
;
7917 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7918 mddev
->resync_min
= mddev
->curr_resync_completed
;
7919 mddev
->curr_resync
= 0;
7920 spin_unlock(&mddev
->lock
);
7922 wake_up(&resync_wait
);
7923 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7924 md_wakeup_thread(mddev
->thread
);
7927 EXPORT_SYMBOL_GPL(md_do_sync
);
7929 static int remove_and_add_spares(struct mddev
*mddev
,
7930 struct md_rdev
*this)
7932 struct md_rdev
*rdev
;
7936 rdev_for_each(rdev
, mddev
)
7937 if ((this == NULL
|| rdev
== this) &&
7938 rdev
->raid_disk
>= 0 &&
7939 !test_bit(Blocked
, &rdev
->flags
) &&
7940 (test_bit(Faulty
, &rdev
->flags
) ||
7941 ! test_bit(In_sync
, &rdev
->flags
)) &&
7942 atomic_read(&rdev
->nr_pending
)==0) {
7943 if (mddev
->pers
->hot_remove_disk(
7944 mddev
, rdev
) == 0) {
7945 sysfs_unlink_rdev(mddev
, rdev
);
7946 rdev
->raid_disk
= -1;
7950 if (removed
&& mddev
->kobj
.sd
)
7951 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7956 rdev_for_each(rdev
, mddev
) {
7957 if (rdev
->raid_disk
>= 0 &&
7958 !test_bit(In_sync
, &rdev
->flags
) &&
7959 !test_bit(Faulty
, &rdev
->flags
))
7961 if (rdev
->raid_disk
>= 0)
7963 if (test_bit(Faulty
, &rdev
->flags
))
7966 ! (rdev
->saved_raid_disk
>= 0 &&
7967 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7970 if (rdev
->saved_raid_disk
< 0)
7971 rdev
->recovery_offset
= 0;
7973 hot_add_disk(mddev
, rdev
) == 0) {
7974 if (sysfs_link_rdev(mddev
, rdev
))
7975 /* failure here is OK */;
7977 md_new_event(mddev
);
7978 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7983 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7987 static void md_start_sync(struct work_struct
*ws
)
7989 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7991 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7994 if (!mddev
->sync_thread
) {
7995 printk(KERN_ERR
"%s: could not start resync"
7998 /* leave the spares where they are, it shouldn't hurt */
7999 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8000 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8001 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8002 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8003 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8004 wake_up(&resync_wait
);
8005 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8007 if (mddev
->sysfs_action
)
8008 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8010 md_wakeup_thread(mddev
->sync_thread
);
8011 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8012 md_new_event(mddev
);
8016 * This routine is regularly called by all per-raid-array threads to
8017 * deal with generic issues like resync and super-block update.
8018 * Raid personalities that don't have a thread (linear/raid0) do not
8019 * need this as they never do any recovery or update the superblock.
8021 * It does not do any resync itself, but rather "forks" off other threads
8022 * to do that as needed.
8023 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8024 * "->recovery" and create a thread at ->sync_thread.
8025 * When the thread finishes it sets MD_RECOVERY_DONE
8026 * and wakeups up this thread which will reap the thread and finish up.
8027 * This thread also removes any faulty devices (with nr_pending == 0).
8029 * The overall approach is:
8030 * 1/ if the superblock needs updating, update it.
8031 * 2/ If a recovery thread is running, don't do anything else.
8032 * 3/ If recovery has finished, clean up, possibly marking spares active.
8033 * 4/ If there are any faulty devices, remove them.
8034 * 5/ If array is degraded, try to add spares devices
8035 * 6/ If array has spares or is not in-sync, start a resync thread.
8037 void md_check_recovery(struct mddev
*mddev
)
8039 if (mddev
->suspended
)
8043 bitmap_daemon_work(mddev
);
8045 if (signal_pending(current
)) {
8046 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8047 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8049 mddev
->safemode
= 2;
8051 flush_signals(current
);
8054 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8057 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8058 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8059 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8060 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8061 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8062 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8066 if (mddev_trylock(mddev
)) {
8070 /* On a read-only array we can:
8071 * - remove failed devices
8072 * - add already-in_sync devices if the array itself
8074 * As we only add devices that are already in-sync,
8075 * we can activate the spares immediately.
8077 remove_and_add_spares(mddev
, NULL
);
8078 /* There is no thread, but we need to call
8079 * ->spare_active and clear saved_raid_disk
8081 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8082 md_reap_sync_thread(mddev
);
8083 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8087 if (!mddev
->external
) {
8089 spin_lock(&mddev
->lock
);
8090 if (mddev
->safemode
&&
8091 !atomic_read(&mddev
->writes_pending
) &&
8093 mddev
->recovery_cp
== MaxSector
) {
8096 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8098 if (mddev
->safemode
== 1)
8099 mddev
->safemode
= 0;
8100 spin_unlock(&mddev
->lock
);
8102 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8105 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
) {
8106 if (mddev_is_clustered(mddev
))
8107 md_cluster_ops
->metadata_update_start(mddev
);
8108 md_update_sb(mddev
, 0);
8109 if (mddev_is_clustered(mddev
))
8110 md_cluster_ops
->metadata_update_finish(mddev
);
8113 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8114 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8115 /* resync/recovery still happening */
8116 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8119 if (mddev
->sync_thread
) {
8120 md_reap_sync_thread(mddev
);
8123 /* Set RUNNING before clearing NEEDED to avoid
8124 * any transients in the value of "sync_action".
8126 mddev
->curr_resync_completed
= 0;
8127 spin_lock(&mddev
->lock
);
8128 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8129 spin_unlock(&mddev
->lock
);
8130 /* Clear some bits that don't mean anything, but
8133 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8134 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8136 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8137 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8139 /* no recovery is running.
8140 * remove any failed drives, then
8141 * add spares if possible.
8142 * Spares are also removed and re-added, to allow
8143 * the personality to fail the re-add.
8146 if (mddev
->reshape_position
!= MaxSector
) {
8147 if (mddev
->pers
->check_reshape
== NULL
||
8148 mddev
->pers
->check_reshape(mddev
) != 0)
8149 /* Cannot proceed */
8151 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8152 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8153 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8154 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8155 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8156 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8157 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8158 } else if (mddev
->recovery_cp
< MaxSector
) {
8159 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8160 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8161 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8162 /* nothing to be done ... */
8165 if (mddev
->pers
->sync_request
) {
8167 /* We are adding a device or devices to an array
8168 * which has the bitmap stored on all devices.
8169 * So make sure all bitmap pages get written
8171 bitmap_write_all(mddev
->bitmap
);
8173 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8174 queue_work(md_misc_wq
, &mddev
->del_work
);
8178 if (!mddev
->sync_thread
) {
8179 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8180 wake_up(&resync_wait
);
8181 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8183 if (mddev
->sysfs_action
)
8184 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8187 wake_up(&mddev
->sb_wait
);
8188 mddev_unlock(mddev
);
8191 EXPORT_SYMBOL(md_check_recovery
);
8193 void md_reap_sync_thread(struct mddev
*mddev
)
8195 struct md_rdev
*rdev
;
8197 /* resync has finished, collect result */
8198 md_unregister_thread(&mddev
->sync_thread
);
8199 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8200 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8202 /* activate any spares */
8203 if (mddev
->pers
->spare_active(mddev
)) {
8204 sysfs_notify(&mddev
->kobj
, NULL
,
8206 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8209 if (mddev_is_clustered(mddev
))
8210 md_cluster_ops
->metadata_update_start(mddev
);
8211 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8212 mddev
->pers
->finish_reshape
)
8213 mddev
->pers
->finish_reshape(mddev
);
8215 /* If array is no-longer degraded, then any saved_raid_disk
8216 * information must be scrapped.
8218 if (!mddev
->degraded
)
8219 rdev_for_each(rdev
, mddev
)
8220 rdev
->saved_raid_disk
= -1;
8222 md_update_sb(mddev
, 1);
8223 if (mddev_is_clustered(mddev
))
8224 md_cluster_ops
->metadata_update_finish(mddev
);
8225 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8226 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8227 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8228 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8229 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8230 wake_up(&resync_wait
);
8231 /* flag recovery needed just to double check */
8232 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8233 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8234 md_new_event(mddev
);
8235 if (mddev
->event_work
.func
)
8236 queue_work(md_misc_wq
, &mddev
->event_work
);
8238 EXPORT_SYMBOL(md_reap_sync_thread
);
8240 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8242 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8243 wait_event_timeout(rdev
->blocked_wait
,
8244 !test_bit(Blocked
, &rdev
->flags
) &&
8245 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8246 msecs_to_jiffies(5000));
8247 rdev_dec_pending(rdev
, mddev
);
8249 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8251 void md_finish_reshape(struct mddev
*mddev
)
8253 /* called be personality module when reshape completes. */
8254 struct md_rdev
*rdev
;
8256 rdev_for_each(rdev
, mddev
) {
8257 if (rdev
->data_offset
> rdev
->new_data_offset
)
8258 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8260 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8261 rdev
->data_offset
= rdev
->new_data_offset
;
8264 EXPORT_SYMBOL(md_finish_reshape
);
8266 /* Bad block management.
8267 * We can record which blocks on each device are 'bad' and so just
8268 * fail those blocks, or that stripe, rather than the whole device.
8269 * Entries in the bad-block table are 64bits wide. This comprises:
8270 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8271 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8272 * A 'shift' can be set so that larger blocks are tracked and
8273 * consequently larger devices can be covered.
8274 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8276 * Locking of the bad-block table uses a seqlock so md_is_badblock
8277 * might need to retry if it is very unlucky.
8278 * We will sometimes want to check for bad blocks in a bi_end_io function,
8279 * so we use the write_seqlock_irq variant.
8281 * When looking for a bad block we specify a range and want to
8282 * know if any block in the range is bad. So we binary-search
8283 * to the last range that starts at-or-before the given endpoint,
8284 * (or "before the sector after the target range")
8285 * then see if it ends after the given start.
8287 * 0 if there are no known bad blocks in the range
8288 * 1 if there are known bad block which are all acknowledged
8289 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8290 * plus the start/length of the first bad section we overlap.
8292 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8293 sector_t
*first_bad
, int *bad_sectors
)
8299 sector_t target
= s
+ sectors
;
8302 if (bb
->shift
> 0) {
8303 /* round the start down, and the end up */
8305 target
+= (1<<bb
->shift
) - 1;
8306 target
>>= bb
->shift
;
8307 sectors
= target
- s
;
8309 /* 'target' is now the first block after the bad range */
8312 seq
= read_seqbegin(&bb
->lock
);
8317 /* Binary search between lo and hi for 'target'
8318 * i.e. for the last range that starts before 'target'
8320 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8321 * are known not to be the last range before target.
8322 * VARIANT: hi-lo is the number of possible
8323 * ranges, and decreases until it reaches 1
8325 while (hi
- lo
> 1) {
8326 int mid
= (lo
+ hi
) / 2;
8327 sector_t a
= BB_OFFSET(p
[mid
]);
8329 /* This could still be the one, earlier ranges
8333 /* This and later ranges are definitely out. */
8336 /* 'lo' might be the last that started before target, but 'hi' isn't */
8338 /* need to check all range that end after 's' to see if
8339 * any are unacknowledged.
8342 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8343 if (BB_OFFSET(p
[lo
]) < target
) {
8344 /* starts before the end, and finishes after
8345 * the start, so they must overlap
8347 if (rv
!= -1 && BB_ACK(p
[lo
]))
8351 *first_bad
= BB_OFFSET(p
[lo
]);
8352 *bad_sectors
= BB_LEN(p
[lo
]);
8358 if (read_seqretry(&bb
->lock
, seq
))
8363 EXPORT_SYMBOL_GPL(md_is_badblock
);
8366 * Add a range of bad blocks to the table.
8367 * This might extend the table, or might contract it
8368 * if two adjacent ranges can be merged.
8369 * We binary-search to find the 'insertion' point, then
8370 * decide how best to handle it.
8372 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8378 unsigned long flags
;
8381 /* badblocks are disabled */
8385 /* round the start down, and the end up */
8386 sector_t next
= s
+ sectors
;
8388 next
+= (1<<bb
->shift
) - 1;
8393 write_seqlock_irqsave(&bb
->lock
, flags
);
8398 /* Find the last range that starts at-or-before 's' */
8399 while (hi
- lo
> 1) {
8400 int mid
= (lo
+ hi
) / 2;
8401 sector_t a
= BB_OFFSET(p
[mid
]);
8407 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8411 /* we found a range that might merge with the start
8414 sector_t a
= BB_OFFSET(p
[lo
]);
8415 sector_t e
= a
+ BB_LEN(p
[lo
]);
8416 int ack
= BB_ACK(p
[lo
]);
8418 /* Yes, we can merge with a previous range */
8419 if (s
== a
&& s
+ sectors
>= e
)
8420 /* new range covers old */
8423 ack
= ack
&& acknowledged
;
8425 if (e
< s
+ sectors
)
8427 if (e
- a
<= BB_MAX_LEN
) {
8428 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8431 /* does not all fit in one range,
8432 * make p[lo] maximal
8434 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8435 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8441 if (sectors
&& hi
< bb
->count
) {
8442 /* 'hi' points to the first range that starts after 's'.
8443 * Maybe we can merge with the start of that range */
8444 sector_t a
= BB_OFFSET(p
[hi
]);
8445 sector_t e
= a
+ BB_LEN(p
[hi
]);
8446 int ack
= BB_ACK(p
[hi
]);
8447 if (a
<= s
+ sectors
) {
8448 /* merging is possible */
8449 if (e
<= s
+ sectors
) {
8454 ack
= ack
&& acknowledged
;
8457 if (e
- a
<= BB_MAX_LEN
) {
8458 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8461 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8469 if (sectors
== 0 && hi
< bb
->count
) {
8470 /* we might be able to combine lo and hi */
8471 /* Note: 's' is at the end of 'lo' */
8472 sector_t a
= BB_OFFSET(p
[hi
]);
8473 int lolen
= BB_LEN(p
[lo
]);
8474 int hilen
= BB_LEN(p
[hi
]);
8475 int newlen
= lolen
+ hilen
- (s
- a
);
8476 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8477 /* yes, we can combine them */
8478 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8479 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8480 memmove(p
+ hi
, p
+ hi
+ 1,
8481 (bb
->count
- hi
- 1) * 8);
8486 /* didn't merge (it all).
8487 * Need to add a range just before 'hi' */
8488 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8489 /* No room for more */
8493 int this_sectors
= sectors
;
8494 memmove(p
+ hi
+ 1, p
+ hi
,
8495 (bb
->count
- hi
) * 8);
8498 if (this_sectors
> BB_MAX_LEN
)
8499 this_sectors
= BB_MAX_LEN
;
8500 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8501 sectors
-= this_sectors
;
8508 bb
->unacked_exist
= 1;
8509 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8514 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8519 s
+= rdev
->new_data_offset
;
8521 s
+= rdev
->data_offset
;
8522 rv
= md_set_badblocks(&rdev
->badblocks
,
8525 /* Make sure they get written out promptly */
8526 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8527 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8528 md_wakeup_thread(rdev
->mddev
->thread
);
8532 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8535 * Remove a range of bad blocks from the table.
8536 * This may involve extending the table if we spilt a region,
8537 * but it must not fail. So if the table becomes full, we just
8538 * drop the remove request.
8540 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8544 sector_t target
= s
+ sectors
;
8547 if (bb
->shift
> 0) {
8548 /* When clearing we round the start up and the end down.
8549 * This should not matter as the shift should align with
8550 * the block size and no rounding should ever be needed.
8551 * However it is better the think a block is bad when it
8552 * isn't than to think a block is not bad when it is.
8554 s
+= (1<<bb
->shift
) - 1;
8556 target
>>= bb
->shift
;
8557 sectors
= target
- s
;
8560 write_seqlock_irq(&bb
->lock
);
8565 /* Find the last range that starts before 'target' */
8566 while (hi
- lo
> 1) {
8567 int mid
= (lo
+ hi
) / 2;
8568 sector_t a
= BB_OFFSET(p
[mid
]);
8575 /* p[lo] is the last range that could overlap the
8576 * current range. Earlier ranges could also overlap,
8577 * but only this one can overlap the end of the range.
8579 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8580 /* Partial overlap, leave the tail of this range */
8581 int ack
= BB_ACK(p
[lo
]);
8582 sector_t a
= BB_OFFSET(p
[lo
]);
8583 sector_t end
= a
+ BB_LEN(p
[lo
]);
8586 /* we need to split this range */
8587 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8591 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8593 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8596 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8597 /* there is no longer an overlap */
8602 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8603 /* This range does overlap */
8604 if (BB_OFFSET(p
[lo
]) < s
) {
8605 /* Keep the early parts of this range. */
8606 int ack
= BB_ACK(p
[lo
]);
8607 sector_t start
= BB_OFFSET(p
[lo
]);
8608 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8609 /* now low doesn't overlap, so.. */
8614 /* 'lo' is strictly before, 'hi' is strictly after,
8615 * anything between needs to be discarded
8618 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8619 bb
->count
-= (hi
- lo
- 1);
8625 write_sequnlock_irq(&bb
->lock
);
8629 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8633 s
+= rdev
->new_data_offset
;
8635 s
+= rdev
->data_offset
;
8636 return md_clear_badblocks(&rdev
->badblocks
,
8639 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8642 * Acknowledge all bad blocks in a list.
8643 * This only succeeds if ->changed is clear. It is used by
8644 * in-kernel metadata updates
8646 void md_ack_all_badblocks(struct badblocks
*bb
)
8648 if (bb
->page
== NULL
|| bb
->changed
)
8649 /* no point even trying */
8651 write_seqlock_irq(&bb
->lock
);
8653 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8656 for (i
= 0; i
< bb
->count
; i
++) {
8657 if (!BB_ACK(p
[i
])) {
8658 sector_t start
= BB_OFFSET(p
[i
]);
8659 int len
= BB_LEN(p
[i
]);
8660 p
[i
] = BB_MAKE(start
, len
, 1);
8663 bb
->unacked_exist
= 0;
8665 write_sequnlock_irq(&bb
->lock
);
8667 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8669 /* sysfs access to bad-blocks list.
8670 * We present two files.
8671 * 'bad-blocks' lists sector numbers and lengths of ranges that
8672 * are recorded as bad. The list is truncated to fit within
8673 * the one-page limit of sysfs.
8674 * Writing "sector length" to this file adds an acknowledged
8676 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8677 * been acknowledged. Writing to this file adds bad blocks
8678 * without acknowledging them. This is largely for testing.
8682 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8693 seq
= read_seqbegin(&bb
->lock
);
8698 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8699 sector_t s
= BB_OFFSET(p
[i
]);
8700 unsigned int length
= BB_LEN(p
[i
]);
8701 int ack
= BB_ACK(p
[i
]);
8707 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8708 (unsigned long long)s
<< bb
->shift
,
8709 length
<< bb
->shift
);
8711 if (unack
&& len
== 0)
8712 bb
->unacked_exist
= 0;
8714 if (read_seqretry(&bb
->lock
, seq
))
8723 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8725 unsigned long long sector
;
8729 /* Allow clearing via sysfs *only* for testing/debugging.
8730 * Normally only a successful write may clear a badblock
8733 if (page
[0] == '-') {
8737 #endif /* DO_DEBUG */
8739 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8741 if (newline
!= '\n')
8753 md_clear_badblocks(bb
, sector
, length
);
8756 #endif /* DO_DEBUG */
8757 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8763 static int md_notify_reboot(struct notifier_block
*this,
8764 unsigned long code
, void *x
)
8766 struct list_head
*tmp
;
8767 struct mddev
*mddev
;
8770 for_each_mddev(mddev
, tmp
) {
8771 if (mddev_trylock(mddev
)) {
8773 __md_stop_writes(mddev
);
8774 if (mddev
->persistent
)
8775 mddev
->safemode
= 2;
8776 mddev_unlock(mddev
);
8781 * certain more exotic SCSI devices are known to be
8782 * volatile wrt too early system reboots. While the
8783 * right place to handle this issue is the given
8784 * driver, we do want to have a safe RAID driver ...
8792 static struct notifier_block md_notifier
= {
8793 .notifier_call
= md_notify_reboot
,
8795 .priority
= INT_MAX
, /* before any real devices */
8798 static void md_geninit(void)
8800 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8802 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8805 static int __init
md_init(void)
8809 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8813 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8817 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8820 if ((ret
= register_blkdev(0, "mdp")) < 0)
8824 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8825 md_probe
, NULL
, NULL
);
8826 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8827 md_probe
, NULL
, NULL
);
8829 register_reboot_notifier(&md_notifier
);
8830 raid_table_header
= register_sysctl_table(raid_root_table
);
8836 unregister_blkdev(MD_MAJOR
, "md");
8838 destroy_workqueue(md_misc_wq
);
8840 destroy_workqueue(md_wq
);
8845 void md_reload_sb(struct mddev
*mddev
)
8847 struct md_rdev
*rdev
, *tmp
;
8849 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8850 rdev
->sb_loaded
= 0;
8851 ClearPageUptodate(rdev
->sb_page
);
8853 mddev
->raid_disks
= 0;
8855 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8856 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8857 /* since we don't write to faulty devices, we figure out if the
8858 * disk is faulty by comparing events
8860 if (mddev
->events
> sb
->events
)
8861 set_bit(Faulty
, &rdev
->flags
);
8865 EXPORT_SYMBOL(md_reload_sb
);
8870 * Searches all registered partitions for autorun RAID arrays
8874 static LIST_HEAD(all_detected_devices
);
8875 struct detected_devices_node
{
8876 struct list_head list
;
8880 void md_autodetect_dev(dev_t dev
)
8882 struct detected_devices_node
*node_detected_dev
;
8884 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8885 if (node_detected_dev
) {
8886 node_detected_dev
->dev
= dev
;
8887 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8889 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8890 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8894 static void autostart_arrays(int part
)
8896 struct md_rdev
*rdev
;
8897 struct detected_devices_node
*node_detected_dev
;
8899 int i_scanned
, i_passed
;
8904 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8906 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8908 node_detected_dev
= list_entry(all_detected_devices
.next
,
8909 struct detected_devices_node
, list
);
8910 list_del(&node_detected_dev
->list
);
8911 dev
= node_detected_dev
->dev
;
8912 kfree(node_detected_dev
);
8913 rdev
= md_import_device(dev
,0, 90);
8917 if (test_bit(Faulty
, &rdev
->flags
))
8920 set_bit(AutoDetected
, &rdev
->flags
);
8921 list_add(&rdev
->same_set
, &pending_raid_disks
);
8925 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8926 i_scanned
, i_passed
);
8928 autorun_devices(part
);
8931 #endif /* !MODULE */
8933 static __exit
void md_exit(void)
8935 struct mddev
*mddev
;
8936 struct list_head
*tmp
;
8939 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8940 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8942 unregister_blkdev(MD_MAJOR
,"md");
8943 unregister_blkdev(mdp_major
, "mdp");
8944 unregister_reboot_notifier(&md_notifier
);
8945 unregister_sysctl_table(raid_table_header
);
8947 /* We cannot unload the modules while some process is
8948 * waiting for us in select() or poll() - wake them up
8951 while (waitqueue_active(&md_event_waiters
)) {
8952 /* not safe to leave yet */
8953 wake_up(&md_event_waiters
);
8957 remove_proc_entry("mdstat", NULL
);
8959 for_each_mddev(mddev
, tmp
) {
8960 export_array(mddev
);
8961 mddev
->hold_active
= 0;
8963 destroy_workqueue(md_misc_wq
);
8964 destroy_workqueue(md_wq
);
8967 subsys_initcall(md_init
);
8968 module_exit(md_exit
)
8970 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8972 return sprintf(buffer
, "%d", start_readonly
);
8974 static int set_ro(const char *val
, struct kernel_param
*kp
)
8977 int num
= simple_strtoul(val
, &e
, 10);
8978 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8979 start_readonly
= num
;
8985 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8986 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8987 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8989 MODULE_LICENSE("GPL");
8990 MODULE_DESCRIPTION("MD RAID framework");
8992 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);