2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
56 #include "md-cluster.h"
59 static void autostart_arrays(int part
);
62 /* pers_list is a list of registered personalities protected
64 * pers_lock does extra service to protect accesses to
65 * mddev->thread when the mutex cannot be held.
67 static LIST_HEAD(pers_list
);
68 static DEFINE_SPINLOCK(pers_lock
);
70 struct md_cluster_operations
*md_cluster_ops
;
71 EXPORT_SYMBOL(md_cluster_ops
);
72 struct module
*md_cluster_mod
;
73 EXPORT_SYMBOL(md_cluster_mod
);
75 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
76 static struct workqueue_struct
*md_wq
;
77 static struct workqueue_struct
*md_misc_wq
;
79 static int remove_and_add_spares(struct mddev
*mddev
,
80 struct md_rdev
*this);
81 static void mddev_detach(struct mddev
*mddev
);
84 * Default number of read corrections we'll attempt on an rdev
85 * before ejecting it from the array. We divide the read error
86 * count by 2 for every hour elapsed between read errors.
88 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
90 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
91 * is 1000 KB/sec, so the extra system load does not show up that much.
92 * Increase it if you want to have more _guaranteed_ speed. Note that
93 * the RAID driver will use the maximum available bandwidth if the IO
94 * subsystem is idle. There is also an 'absolute maximum' reconstruction
95 * speed limit - in case reconstruction slows down your system despite
98 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
99 * or /sys/block/mdX/md/sync_speed_{min,max}
102 static int sysctl_speed_limit_min
= 1000;
103 static int sysctl_speed_limit_max
= 200000;
104 static inline int speed_min(struct mddev
*mddev
)
106 return mddev
->sync_speed_min
?
107 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
110 static inline int speed_max(struct mddev
*mddev
)
112 return mddev
->sync_speed_max
?
113 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
116 static struct ctl_table_header
*raid_table_header
;
118 static struct ctl_table raid_table
[] = {
120 .procname
= "speed_limit_min",
121 .data
= &sysctl_speed_limit_min
,
122 .maxlen
= sizeof(int),
123 .mode
= S_IRUGO
|S_IWUSR
,
124 .proc_handler
= proc_dointvec
,
127 .procname
= "speed_limit_max",
128 .data
= &sysctl_speed_limit_max
,
129 .maxlen
= sizeof(int),
130 .mode
= S_IRUGO
|S_IWUSR
,
131 .proc_handler
= proc_dointvec
,
136 static struct ctl_table raid_dir_table
[] = {
140 .mode
= S_IRUGO
|S_IXUGO
,
146 static struct ctl_table raid_root_table
[] = {
151 .child
= raid_dir_table
,
156 static const struct block_device_operations md_fops
;
158 static int start_readonly
;
161 * like bio_clone, but with a local bio set
164 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
169 if (!mddev
|| !mddev
->bio_set
)
170 return bio_alloc(gfp_mask
, nr_iovecs
);
172 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
177 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
179 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
182 if (!mddev
|| !mddev
->bio_set
)
183 return bio_clone(bio
, gfp_mask
);
185 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
187 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
190 * We have a system wide 'event count' that is incremented
191 * on any 'interesting' event, and readers of /proc/mdstat
192 * can use 'poll' or 'select' to find out when the event
196 * start array, stop array, error, add device, remove device,
197 * start build, activate spare
199 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
200 static atomic_t md_event_count
;
201 void md_new_event(struct mddev
*mddev
)
203 atomic_inc(&md_event_count
);
204 wake_up(&md_event_waiters
);
206 EXPORT_SYMBOL_GPL(md_new_event
);
208 /* Alternate version that can be called from interrupts
209 * when calling sysfs_notify isn't needed.
211 static void md_new_event_inintr(struct mddev
*mddev
)
213 atomic_inc(&md_event_count
);
214 wake_up(&md_event_waiters
);
218 * Enables to iterate over all existing md arrays
219 * all_mddevs_lock protects this list.
221 static LIST_HEAD(all_mddevs
);
222 static DEFINE_SPINLOCK(all_mddevs_lock
);
225 * iterates through all used mddevs in the system.
226 * We take care to grab the all_mddevs_lock whenever navigating
227 * the list, and to always hold a refcount when unlocked.
228 * Any code which breaks out of this loop while own
229 * a reference to the current mddev and must mddev_put it.
231 #define for_each_mddev(_mddev,_tmp) \
233 for (({ spin_lock(&all_mddevs_lock); \
234 _tmp = all_mddevs.next; \
236 ({ if (_tmp != &all_mddevs) \
237 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
238 spin_unlock(&all_mddevs_lock); \
239 if (_mddev) mddev_put(_mddev); \
240 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
241 _tmp != &all_mddevs;}); \
242 ({ spin_lock(&all_mddevs_lock); \
243 _tmp = _tmp->next;}) \
246 /* Rather than calling directly into the personality make_request function,
247 * IO requests come here first so that we can check if the device is
248 * being suspended pending a reconfiguration.
249 * We hold a refcount over the call to ->make_request. By the time that
250 * call has finished, the bio has been linked into some internal structure
251 * and so is visible to ->quiesce(), so we don't need the refcount any more.
253 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
255 const int rw
= bio_data_dir(bio
);
256 struct mddev
*mddev
= q
->queuedata
;
257 unsigned int sectors
;
259 if (mddev
== NULL
|| mddev
->pers
== NULL
264 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
265 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev
->suspended
) {
273 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
274 TASK_UNINTERRUPTIBLE
);
275 if (!mddev
->suspended
)
281 finish_wait(&mddev
->sb_wait
, &__wait
);
283 atomic_inc(&mddev
->active_io
);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors
= bio_sectors(bio
);
291 mddev
->pers
->make_request(mddev
, bio
);
293 generic_start_io_acct(rw
, sectors
, &mddev
->gendisk
->part0
);
295 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
296 wake_up(&mddev
->sb_wait
);
299 /* mddev_suspend makes sure no new requests are submitted
300 * to the device, and that any requests that have been submitted
301 * are completely handled.
302 * Once mddev_detach() is called and completes, the module will be
305 void mddev_suspend(struct mddev
*mddev
)
307 BUG_ON(mddev
->suspended
);
308 mddev
->suspended
= 1;
310 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
311 mddev
->pers
->quiesce(mddev
, 1);
313 del_timer_sync(&mddev
->safemode_timer
);
315 EXPORT_SYMBOL_GPL(mddev_suspend
);
317 void mddev_resume(struct mddev
*mddev
)
319 mddev
->suspended
= 0;
320 wake_up(&mddev
->sb_wait
);
321 mddev
->pers
->quiesce(mddev
, 0);
323 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
324 md_wakeup_thread(mddev
->thread
);
325 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
327 EXPORT_SYMBOL_GPL(mddev_resume
);
329 int mddev_congested(struct mddev
*mddev
, int bits
)
331 struct md_personality
*pers
= mddev
->pers
;
335 if (mddev
->suspended
)
337 else if (pers
&& pers
->congested
)
338 ret
= pers
->congested(mddev
, bits
);
342 EXPORT_SYMBOL_GPL(mddev_congested
);
343 static int md_congested(void *data
, int bits
)
345 struct mddev
*mddev
= data
;
346 return mddev_congested(mddev
, bits
);
349 static int md_mergeable_bvec(struct request_queue
*q
,
350 struct bvec_merge_data
*bvm
,
351 struct bio_vec
*biovec
)
353 struct mddev
*mddev
= q
->queuedata
;
356 if (mddev
->suspended
) {
357 /* Must always allow one vec */
358 if (bvm
->bi_size
== 0)
359 ret
= biovec
->bv_len
;
363 struct md_personality
*pers
= mddev
->pers
;
364 if (pers
&& pers
->mergeable_bvec
)
365 ret
= pers
->mergeable_bvec(mddev
, bvm
, biovec
);
367 ret
= biovec
->bv_len
;
373 * Generic flush handling for md
376 static void md_end_flush(struct bio
*bio
, int err
)
378 struct md_rdev
*rdev
= bio
->bi_private
;
379 struct mddev
*mddev
= rdev
->mddev
;
381 rdev_dec_pending(rdev
, mddev
);
383 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
384 /* The pre-request flush has finished */
385 queue_work(md_wq
, &mddev
->flush_work
);
390 static void md_submit_flush_data(struct work_struct
*ws
);
392 static void submit_flushes(struct work_struct
*ws
)
394 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
395 struct md_rdev
*rdev
;
397 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
398 atomic_set(&mddev
->flush_pending
, 1);
400 rdev_for_each_rcu(rdev
, mddev
)
401 if (rdev
->raid_disk
>= 0 &&
402 !test_bit(Faulty
, &rdev
->flags
)) {
403 /* Take two references, one is dropped
404 * when request finishes, one after
405 * we reclaim rcu_read_lock
408 atomic_inc(&rdev
->nr_pending
);
409 atomic_inc(&rdev
->nr_pending
);
411 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
412 bi
->bi_end_io
= md_end_flush
;
413 bi
->bi_private
= rdev
;
414 bi
->bi_bdev
= rdev
->bdev
;
415 atomic_inc(&mddev
->flush_pending
);
416 submit_bio(WRITE_FLUSH
, bi
);
418 rdev_dec_pending(rdev
, mddev
);
421 if (atomic_dec_and_test(&mddev
->flush_pending
))
422 queue_work(md_wq
, &mddev
->flush_work
);
425 static void md_submit_flush_data(struct work_struct
*ws
)
427 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
428 struct bio
*bio
= mddev
->flush_bio
;
430 if (bio
->bi_iter
.bi_size
== 0)
431 /* an empty barrier - all done */
434 bio
->bi_rw
&= ~REQ_FLUSH
;
435 mddev
->pers
->make_request(mddev
, bio
);
438 mddev
->flush_bio
= NULL
;
439 wake_up(&mddev
->sb_wait
);
442 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
444 spin_lock_irq(&mddev
->lock
);
445 wait_event_lock_irq(mddev
->sb_wait
,
448 mddev
->flush_bio
= bio
;
449 spin_unlock_irq(&mddev
->lock
);
451 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
452 queue_work(md_wq
, &mddev
->flush_work
);
454 EXPORT_SYMBOL(md_flush_request
);
456 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
458 struct mddev
*mddev
= cb
->data
;
459 md_wakeup_thread(mddev
->thread
);
462 EXPORT_SYMBOL(md_unplug
);
464 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
466 atomic_inc(&mddev
->active
);
470 static void mddev_delayed_delete(struct work_struct
*ws
);
472 static void mddev_put(struct mddev
*mddev
)
474 struct bio_set
*bs
= NULL
;
476 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
478 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
479 mddev
->ctime
== 0 && !mddev
->hold_active
) {
480 /* Array is not configured at all, and not held active,
482 list_del_init(&mddev
->all_mddevs
);
484 mddev
->bio_set
= NULL
;
485 if (mddev
->gendisk
) {
486 /* We did a probe so need to clean up. Call
487 * queue_work inside the spinlock so that
488 * flush_workqueue() after mddev_find will
489 * succeed in waiting for the work to be done.
491 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
492 queue_work(md_misc_wq
, &mddev
->del_work
);
496 spin_unlock(&all_mddevs_lock
);
501 void mddev_init(struct mddev
*mddev
)
503 mutex_init(&mddev
->open_mutex
);
504 mutex_init(&mddev
->reconfig_mutex
);
505 mutex_init(&mddev
->bitmap_info
.mutex
);
506 INIT_LIST_HEAD(&mddev
->disks
);
507 INIT_LIST_HEAD(&mddev
->all_mddevs
);
508 init_timer(&mddev
->safemode_timer
);
509 atomic_set(&mddev
->active
, 1);
510 atomic_set(&mddev
->openers
, 0);
511 atomic_set(&mddev
->active_io
, 0);
512 spin_lock_init(&mddev
->lock
);
513 atomic_set(&mddev
->flush_pending
, 0);
514 init_waitqueue_head(&mddev
->sb_wait
);
515 init_waitqueue_head(&mddev
->recovery_wait
);
516 mddev
->reshape_position
= MaxSector
;
517 mddev
->reshape_backwards
= 0;
518 mddev
->last_sync_action
= "none";
519 mddev
->resync_min
= 0;
520 mddev
->resync_max
= MaxSector
;
521 mddev
->level
= LEVEL_NONE
;
523 EXPORT_SYMBOL_GPL(mddev_init
);
525 static struct mddev
*mddev_find(dev_t unit
)
527 struct mddev
*mddev
, *new = NULL
;
529 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
530 unit
&= ~((1<<MdpMinorShift
)-1);
533 spin_lock(&all_mddevs_lock
);
536 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
537 if (mddev
->unit
== unit
) {
539 spin_unlock(&all_mddevs_lock
);
545 list_add(&new->all_mddevs
, &all_mddevs
);
546 spin_unlock(&all_mddevs_lock
);
547 new->hold_active
= UNTIL_IOCTL
;
551 /* find an unused unit number */
552 static int next_minor
= 512;
553 int start
= next_minor
;
557 dev
= MKDEV(MD_MAJOR
, next_minor
);
559 if (next_minor
> MINORMASK
)
561 if (next_minor
== start
) {
562 /* Oh dear, all in use. */
563 spin_unlock(&all_mddevs_lock
);
569 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
570 if (mddev
->unit
== dev
) {
576 new->md_minor
= MINOR(dev
);
577 new->hold_active
= UNTIL_STOP
;
578 list_add(&new->all_mddevs
, &all_mddevs
);
579 spin_unlock(&all_mddevs_lock
);
582 spin_unlock(&all_mddevs_lock
);
584 new = kzalloc(sizeof(*new), GFP_KERNEL
);
589 if (MAJOR(unit
) == MD_MAJOR
)
590 new->md_minor
= MINOR(unit
);
592 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
599 static struct attribute_group md_redundancy_group
;
601 void mddev_unlock(struct mddev
*mddev
)
603 if (mddev
->to_remove
) {
604 /* These cannot be removed under reconfig_mutex as
605 * an access to the files will try to take reconfig_mutex
606 * while holding the file unremovable, which leads to
608 * So hold set sysfs_active while the remove in happeing,
609 * and anything else which might set ->to_remove or my
610 * otherwise change the sysfs namespace will fail with
611 * -EBUSY if sysfs_active is still set.
612 * We set sysfs_active under reconfig_mutex and elsewhere
613 * test it under the same mutex to ensure its correct value
616 struct attribute_group
*to_remove
= mddev
->to_remove
;
617 mddev
->to_remove
= NULL
;
618 mddev
->sysfs_active
= 1;
619 mutex_unlock(&mddev
->reconfig_mutex
);
621 if (mddev
->kobj
.sd
) {
622 if (to_remove
!= &md_redundancy_group
)
623 sysfs_remove_group(&mddev
->kobj
, to_remove
);
624 if (mddev
->pers
== NULL
||
625 mddev
->pers
->sync_request
== NULL
) {
626 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
627 if (mddev
->sysfs_action
)
628 sysfs_put(mddev
->sysfs_action
);
629 mddev
->sysfs_action
= NULL
;
632 mddev
->sysfs_active
= 0;
634 mutex_unlock(&mddev
->reconfig_mutex
);
636 /* As we've dropped the mutex we need a spinlock to
637 * make sure the thread doesn't disappear
639 spin_lock(&pers_lock
);
640 md_wakeup_thread(mddev
->thread
);
641 spin_unlock(&pers_lock
);
643 EXPORT_SYMBOL_GPL(mddev_unlock
);
645 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
647 struct md_rdev
*rdev
;
649 rdev_for_each_rcu(rdev
, mddev
)
650 if (rdev
->desc_nr
== nr
)
655 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
657 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
659 struct md_rdev
*rdev
;
661 rdev_for_each(rdev
, mddev
)
662 if (rdev
->bdev
->bd_dev
== dev
)
668 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
670 struct md_rdev
*rdev
;
672 rdev_for_each_rcu(rdev
, mddev
)
673 if (rdev
->bdev
->bd_dev
== dev
)
679 static struct md_personality
*find_pers(int level
, char *clevel
)
681 struct md_personality
*pers
;
682 list_for_each_entry(pers
, &pers_list
, list
) {
683 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
685 if (strcmp(pers
->name
, clevel
)==0)
691 /* return the offset of the super block in 512byte sectors */
692 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
694 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
695 return MD_NEW_SIZE_SECTORS(num_sectors
);
698 static int alloc_disk_sb(struct md_rdev
*rdev
)
700 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
701 if (!rdev
->sb_page
) {
702 printk(KERN_ALERT
"md: out of memory.\n");
709 void md_rdev_clear(struct md_rdev
*rdev
)
712 put_page(rdev
->sb_page
);
714 rdev
->sb_page
= NULL
;
719 put_page(rdev
->bb_page
);
720 rdev
->bb_page
= NULL
;
722 kfree(rdev
->badblocks
.page
);
723 rdev
->badblocks
.page
= NULL
;
725 EXPORT_SYMBOL_GPL(md_rdev_clear
);
727 static void super_written(struct bio
*bio
, int error
)
729 struct md_rdev
*rdev
= bio
->bi_private
;
730 struct mddev
*mddev
= rdev
->mddev
;
732 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
733 printk("md: super_written gets error=%d, uptodate=%d\n",
734 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
735 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
736 md_error(mddev
, rdev
);
739 if (atomic_dec_and_test(&mddev
->pending_writes
))
740 wake_up(&mddev
->sb_wait
);
744 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
745 sector_t sector
, int size
, struct page
*page
)
747 /* write first size bytes of page to sector of rdev
748 * Increment mddev->pending_writes before returning
749 * and decrement it on completion, waking up sb_wait
750 * if zero is reached.
751 * If an error occurred, call md_error
753 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
755 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
756 bio
->bi_iter
.bi_sector
= sector
;
757 bio_add_page(bio
, page
, size
, 0);
758 bio
->bi_private
= rdev
;
759 bio
->bi_end_io
= super_written
;
761 atomic_inc(&mddev
->pending_writes
);
762 submit_bio(WRITE_FLUSH_FUA
, bio
);
765 void md_super_wait(struct mddev
*mddev
)
767 /* wait for all superblock writes that were scheduled to complete */
768 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
771 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
772 struct page
*page
, int rw
, bool metadata_op
)
774 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
777 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
778 rdev
->meta_bdev
: rdev
->bdev
;
780 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
781 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
782 (rdev
->mddev
->reshape_backwards
==
783 (sector
>= rdev
->mddev
->reshape_position
)))
784 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
786 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
787 bio_add_page(bio
, page
, size
, 0);
788 submit_bio_wait(rw
, bio
);
790 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
794 EXPORT_SYMBOL_GPL(sync_page_io
);
796 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
798 char b
[BDEVNAME_SIZE
];
803 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
809 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
810 bdevname(rdev
->bdev
,b
));
814 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
816 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
817 sb1
->set_uuid1
== sb2
->set_uuid1
&&
818 sb1
->set_uuid2
== sb2
->set_uuid2
&&
819 sb1
->set_uuid3
== sb2
->set_uuid3
;
822 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
825 mdp_super_t
*tmp1
, *tmp2
;
827 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
828 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
830 if (!tmp1
|| !tmp2
) {
832 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
840 * nr_disks is not constant
845 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
852 static u32
md_csum_fold(u32 csum
)
854 csum
= (csum
& 0xffff) + (csum
>> 16);
855 return (csum
& 0xffff) + (csum
>> 16);
858 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
861 u32
*sb32
= (u32
*)sb
;
863 unsigned int disk_csum
, csum
;
865 disk_csum
= sb
->sb_csum
;
868 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
870 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
873 /* This used to use csum_partial, which was wrong for several
874 * reasons including that different results are returned on
875 * different architectures. It isn't critical that we get exactly
876 * the same return value as before (we always csum_fold before
877 * testing, and that removes any differences). However as we
878 * know that csum_partial always returned a 16bit value on
879 * alphas, do a fold to maximise conformity to previous behaviour.
881 sb
->sb_csum
= md_csum_fold(disk_csum
);
883 sb
->sb_csum
= disk_csum
;
889 * Handle superblock details.
890 * We want to be able to handle multiple superblock formats
891 * so we have a common interface to them all, and an array of
892 * different handlers.
893 * We rely on user-space to write the initial superblock, and support
894 * reading and updating of superblocks.
895 * Interface methods are:
896 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
897 * loads and validates a superblock on dev.
898 * if refdev != NULL, compare superblocks on both devices
900 * 0 - dev has a superblock that is compatible with refdev
901 * 1 - dev has a superblock that is compatible and newer than refdev
902 * so dev should be used as the refdev in future
903 * -EINVAL superblock incompatible or invalid
904 * -othererror e.g. -EIO
906 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
907 * Verify that dev is acceptable into mddev.
908 * The first time, mddev->raid_disks will be 0, and data from
909 * dev should be merged in. Subsequent calls check that dev
910 * is new enough. Return 0 or -EINVAL
912 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
913 * Update the superblock for rdev with data in mddev
914 * This does not write to disc.
920 struct module
*owner
;
921 int (*load_super
)(struct md_rdev
*rdev
,
922 struct md_rdev
*refdev
,
924 int (*validate_super
)(struct mddev
*mddev
,
925 struct md_rdev
*rdev
);
926 void (*sync_super
)(struct mddev
*mddev
,
927 struct md_rdev
*rdev
);
928 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
929 sector_t num_sectors
);
930 int (*allow_new_offset
)(struct md_rdev
*rdev
,
931 unsigned long long new_offset
);
935 * Check that the given mddev has no bitmap.
937 * This function is called from the run method of all personalities that do not
938 * support bitmaps. It prints an error message and returns non-zero if mddev
939 * has a bitmap. Otherwise, it returns 0.
942 int md_check_no_bitmap(struct mddev
*mddev
)
944 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
946 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
947 mdname(mddev
), mddev
->pers
->name
);
950 EXPORT_SYMBOL(md_check_no_bitmap
);
953 * load_super for 0.90.0
955 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
957 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
962 * Calculate the position of the superblock (512byte sectors),
963 * it's at the end of the disk.
965 * It also happens to be a multiple of 4Kb.
967 rdev
->sb_start
= calc_dev_sboffset(rdev
);
969 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
974 bdevname(rdev
->bdev
, b
);
975 sb
= page_address(rdev
->sb_page
);
977 if (sb
->md_magic
!= MD_SB_MAGIC
) {
978 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
983 if (sb
->major_version
!= 0 ||
984 sb
->minor_version
< 90 ||
985 sb
->minor_version
> 91) {
986 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
987 sb
->major_version
, sb
->minor_version
,
992 if (sb
->raid_disks
<= 0)
995 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
996 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1001 rdev
->preferred_minor
= sb
->md_minor
;
1002 rdev
->data_offset
= 0;
1003 rdev
->new_data_offset
= 0;
1004 rdev
->sb_size
= MD_SB_BYTES
;
1005 rdev
->badblocks
.shift
= -1;
1007 if (sb
->level
== LEVEL_MULTIPATH
)
1010 rdev
->desc_nr
= sb
->this_disk
.number
;
1016 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1017 if (!uuid_equal(refsb
, sb
)) {
1018 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1019 b
, bdevname(refdev
->bdev
,b2
));
1022 if (!sb_equal(refsb
, sb
)) {
1023 printk(KERN_WARNING
"md: %s has same UUID"
1024 " but different superblock to %s\n",
1025 b
, bdevname(refdev
->bdev
, b2
));
1029 ev2
= md_event(refsb
);
1035 rdev
->sectors
= rdev
->sb_start
;
1036 /* Limit to 4TB as metadata cannot record more than that.
1037 * (not needed for Linear and RAID0 as metadata doesn't
1040 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1041 rdev
->sectors
= (2ULL << 32) - 2;
1043 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1044 /* "this cannot possibly happen" ... */
1052 * validate_super for 0.90.0
1054 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1057 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1058 __u64 ev1
= md_event(sb
);
1060 rdev
->raid_disk
= -1;
1061 clear_bit(Faulty
, &rdev
->flags
);
1062 clear_bit(In_sync
, &rdev
->flags
);
1063 clear_bit(Bitmap_sync
, &rdev
->flags
);
1064 clear_bit(WriteMostly
, &rdev
->flags
);
1066 if (mddev
->raid_disks
== 0) {
1067 mddev
->major_version
= 0;
1068 mddev
->minor_version
= sb
->minor_version
;
1069 mddev
->patch_version
= sb
->patch_version
;
1070 mddev
->external
= 0;
1071 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1072 mddev
->ctime
= sb
->ctime
;
1073 mddev
->utime
= sb
->utime
;
1074 mddev
->level
= sb
->level
;
1075 mddev
->clevel
[0] = 0;
1076 mddev
->layout
= sb
->layout
;
1077 mddev
->raid_disks
= sb
->raid_disks
;
1078 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1079 mddev
->events
= ev1
;
1080 mddev
->bitmap_info
.offset
= 0;
1081 mddev
->bitmap_info
.space
= 0;
1082 /* bitmap can use 60 K after the 4K superblocks */
1083 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1084 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1085 mddev
->reshape_backwards
= 0;
1087 if (mddev
->minor_version
>= 91) {
1088 mddev
->reshape_position
= sb
->reshape_position
;
1089 mddev
->delta_disks
= sb
->delta_disks
;
1090 mddev
->new_level
= sb
->new_level
;
1091 mddev
->new_layout
= sb
->new_layout
;
1092 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1093 if (mddev
->delta_disks
< 0)
1094 mddev
->reshape_backwards
= 1;
1096 mddev
->reshape_position
= MaxSector
;
1097 mddev
->delta_disks
= 0;
1098 mddev
->new_level
= mddev
->level
;
1099 mddev
->new_layout
= mddev
->layout
;
1100 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1103 if (sb
->state
& (1<<MD_SB_CLEAN
))
1104 mddev
->recovery_cp
= MaxSector
;
1106 if (sb
->events_hi
== sb
->cp_events_hi
&&
1107 sb
->events_lo
== sb
->cp_events_lo
) {
1108 mddev
->recovery_cp
= sb
->recovery_cp
;
1110 mddev
->recovery_cp
= 0;
1113 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1114 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1115 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1116 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1118 mddev
->max_disks
= MD_SB_DISKS
;
1120 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1121 mddev
->bitmap_info
.file
== NULL
) {
1122 mddev
->bitmap_info
.offset
=
1123 mddev
->bitmap_info
.default_offset
;
1124 mddev
->bitmap_info
.space
=
1125 mddev
->bitmap_info
.default_space
;
1128 } else if (mddev
->pers
== NULL
) {
1129 /* Insist on good event counter while assembling, except
1130 * for spares (which don't need an event count) */
1132 if (sb
->disks
[rdev
->desc_nr
].state
& (
1133 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1134 if (ev1
< mddev
->events
)
1136 } else if (mddev
->bitmap
) {
1137 /* if adding to array with a bitmap, then we can accept an
1138 * older device ... but not too old.
1140 if (ev1
< mddev
->bitmap
->events_cleared
)
1142 if (ev1
< mddev
->events
)
1143 set_bit(Bitmap_sync
, &rdev
->flags
);
1145 if (ev1
< mddev
->events
)
1146 /* just a hot-add of a new device, leave raid_disk at -1 */
1150 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1151 desc
= sb
->disks
+ rdev
->desc_nr
;
1153 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1154 set_bit(Faulty
, &rdev
->flags
);
1155 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1156 desc->raid_disk < mddev->raid_disks */) {
1157 set_bit(In_sync
, &rdev
->flags
);
1158 rdev
->raid_disk
= desc
->raid_disk
;
1159 rdev
->saved_raid_disk
= desc
->raid_disk
;
1160 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1161 /* active but not in sync implies recovery up to
1162 * reshape position. We don't know exactly where
1163 * that is, so set to zero for now */
1164 if (mddev
->minor_version
>= 91) {
1165 rdev
->recovery_offset
= 0;
1166 rdev
->raid_disk
= desc
->raid_disk
;
1169 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1170 set_bit(WriteMostly
, &rdev
->flags
);
1171 } else /* MULTIPATH are always insync */
1172 set_bit(In_sync
, &rdev
->flags
);
1177 * sync_super for 0.90.0
1179 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1182 struct md_rdev
*rdev2
;
1183 int next_spare
= mddev
->raid_disks
;
1185 /* make rdev->sb match mddev data..
1188 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1189 * 3/ any empty disks < next_spare become removed
1191 * disks[0] gets initialised to REMOVED because
1192 * we cannot be sure from other fields if it has
1193 * been initialised or not.
1196 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1198 rdev
->sb_size
= MD_SB_BYTES
;
1200 sb
= page_address(rdev
->sb_page
);
1202 memset(sb
, 0, sizeof(*sb
));
1204 sb
->md_magic
= MD_SB_MAGIC
;
1205 sb
->major_version
= mddev
->major_version
;
1206 sb
->patch_version
= mddev
->patch_version
;
1207 sb
->gvalid_words
= 0; /* ignored */
1208 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1209 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1210 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1211 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1213 sb
->ctime
= mddev
->ctime
;
1214 sb
->level
= mddev
->level
;
1215 sb
->size
= mddev
->dev_sectors
/ 2;
1216 sb
->raid_disks
= mddev
->raid_disks
;
1217 sb
->md_minor
= mddev
->md_minor
;
1218 sb
->not_persistent
= 0;
1219 sb
->utime
= mddev
->utime
;
1221 sb
->events_hi
= (mddev
->events
>>32);
1222 sb
->events_lo
= (u32
)mddev
->events
;
1224 if (mddev
->reshape_position
== MaxSector
)
1225 sb
->minor_version
= 90;
1227 sb
->minor_version
= 91;
1228 sb
->reshape_position
= mddev
->reshape_position
;
1229 sb
->new_level
= mddev
->new_level
;
1230 sb
->delta_disks
= mddev
->delta_disks
;
1231 sb
->new_layout
= mddev
->new_layout
;
1232 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1234 mddev
->minor_version
= sb
->minor_version
;
1237 sb
->recovery_cp
= mddev
->recovery_cp
;
1238 sb
->cp_events_hi
= (mddev
->events
>>32);
1239 sb
->cp_events_lo
= (u32
)mddev
->events
;
1240 if (mddev
->recovery_cp
== MaxSector
)
1241 sb
->state
= (1<< MD_SB_CLEAN
);
1243 sb
->recovery_cp
= 0;
1245 sb
->layout
= mddev
->layout
;
1246 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1248 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1249 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1251 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1252 rdev_for_each(rdev2
, mddev
) {
1255 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1257 if (rdev2
->raid_disk
>= 0 &&
1258 sb
->minor_version
>= 91)
1259 /* we have nowhere to store the recovery_offset,
1260 * but if it is not below the reshape_position,
1261 * we can piggy-back on that.
1264 if (rdev2
->raid_disk
< 0 ||
1265 test_bit(Faulty
, &rdev2
->flags
))
1268 desc_nr
= rdev2
->raid_disk
;
1270 desc_nr
= next_spare
++;
1271 rdev2
->desc_nr
= desc_nr
;
1272 d
= &sb
->disks
[rdev2
->desc_nr
];
1274 d
->number
= rdev2
->desc_nr
;
1275 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1276 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1278 d
->raid_disk
= rdev2
->raid_disk
;
1280 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1281 if (test_bit(Faulty
, &rdev2
->flags
))
1282 d
->state
= (1<<MD_DISK_FAULTY
);
1283 else if (is_active
) {
1284 d
->state
= (1<<MD_DISK_ACTIVE
);
1285 if (test_bit(In_sync
, &rdev2
->flags
))
1286 d
->state
|= (1<<MD_DISK_SYNC
);
1294 if (test_bit(WriteMostly
, &rdev2
->flags
))
1295 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1297 /* now set the "removed" and "faulty" bits on any missing devices */
1298 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1299 mdp_disk_t
*d
= &sb
->disks
[i
];
1300 if (d
->state
== 0 && d
->number
== 0) {
1303 d
->state
= (1<<MD_DISK_REMOVED
);
1304 d
->state
|= (1<<MD_DISK_FAULTY
);
1308 sb
->nr_disks
= nr_disks
;
1309 sb
->active_disks
= active
;
1310 sb
->working_disks
= working
;
1311 sb
->failed_disks
= failed
;
1312 sb
->spare_disks
= spare
;
1314 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1315 sb
->sb_csum
= calc_sb_csum(sb
);
1319 * rdev_size_change for 0.90.0
1321 static unsigned long long
1322 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1324 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1325 return 0; /* component must fit device */
1326 if (rdev
->mddev
->bitmap_info
.offset
)
1327 return 0; /* can't move bitmap */
1328 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1329 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1330 num_sectors
= rdev
->sb_start
;
1331 /* Limit to 4TB as metadata cannot record more than that.
1332 * 4TB == 2^32 KB, or 2*2^32 sectors.
1334 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1335 num_sectors
= (2ULL << 32) - 2;
1336 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1338 md_super_wait(rdev
->mddev
);
1343 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1345 /* non-zero offset changes not possible with v0.90 */
1346 return new_offset
== 0;
1350 * version 1 superblock
1353 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1357 unsigned long long newcsum
;
1358 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1359 __le32
*isuper
= (__le32
*)sb
;
1361 disk_csum
= sb
->sb_csum
;
1364 for (; size
>= 4; size
-= 4)
1365 newcsum
+= le32_to_cpu(*isuper
++);
1368 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1370 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1371 sb
->sb_csum
= disk_csum
;
1372 return cpu_to_le32(csum
);
1375 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1377 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1379 struct mdp_superblock_1
*sb
;
1383 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1387 * Calculate the position of the superblock in 512byte sectors.
1388 * It is always aligned to a 4K boundary and
1389 * depeding on minor_version, it can be:
1390 * 0: At least 8K, but less than 12K, from end of device
1391 * 1: At start of device
1392 * 2: 4K from start of device.
1394 switch(minor_version
) {
1396 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1398 sb_start
&= ~(sector_t
)(4*2-1);
1409 rdev
->sb_start
= sb_start
;
1411 /* superblock is rarely larger than 1K, but it can be larger,
1412 * and it is safe to read 4k, so we do that
1414 ret
= read_disk_sb(rdev
, 4096);
1415 if (ret
) return ret
;
1417 sb
= page_address(rdev
->sb_page
);
1419 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1420 sb
->major_version
!= cpu_to_le32(1) ||
1421 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1422 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1423 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1426 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1427 printk("md: invalid superblock checksum on %s\n",
1428 bdevname(rdev
->bdev
,b
));
1431 if (le64_to_cpu(sb
->data_size
) < 10) {
1432 printk("md: data_size too small on %s\n",
1433 bdevname(rdev
->bdev
,b
));
1438 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1439 /* Some padding is non-zero, might be a new feature */
1442 rdev
->preferred_minor
= 0xffff;
1443 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1444 rdev
->new_data_offset
= rdev
->data_offset
;
1445 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1446 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1447 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1448 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1450 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1451 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1452 if (rdev
->sb_size
& bmask
)
1453 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1456 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1459 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1462 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1465 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1467 if (!rdev
->bb_page
) {
1468 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1472 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1473 rdev
->badblocks
.count
== 0) {
1474 /* need to load the bad block list.
1475 * Currently we limit it to one page.
1481 int sectors
= le16_to_cpu(sb
->bblog_size
);
1482 if (sectors
> (PAGE_SIZE
/ 512))
1484 offset
= le32_to_cpu(sb
->bblog_offset
);
1487 bb_sector
= (long long)offset
;
1488 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1489 rdev
->bb_page
, READ
, true))
1491 bbp
= (u64
*)page_address(rdev
->bb_page
);
1492 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1493 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1494 u64 bb
= le64_to_cpu(*bbp
);
1495 int count
= bb
& (0x3ff);
1496 u64 sector
= bb
>> 10;
1497 sector
<<= sb
->bblog_shift
;
1498 count
<<= sb
->bblog_shift
;
1501 if (md_set_badblocks(&rdev
->badblocks
,
1502 sector
, count
, 1) == 0)
1505 } else if (sb
->bblog_offset
!= 0)
1506 rdev
->badblocks
.shift
= 0;
1512 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1514 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1515 sb
->level
!= refsb
->level
||
1516 sb
->layout
!= refsb
->layout
||
1517 sb
->chunksize
!= refsb
->chunksize
) {
1518 printk(KERN_WARNING
"md: %s has strangely different"
1519 " superblock to %s\n",
1520 bdevname(rdev
->bdev
,b
),
1521 bdevname(refdev
->bdev
,b2
));
1524 ev1
= le64_to_cpu(sb
->events
);
1525 ev2
= le64_to_cpu(refsb
->events
);
1532 if (minor_version
) {
1533 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1534 sectors
-= rdev
->data_offset
;
1536 sectors
= rdev
->sb_start
;
1537 if (sectors
< le64_to_cpu(sb
->data_size
))
1539 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1543 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1545 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1546 __u64 ev1
= le64_to_cpu(sb
->events
);
1548 rdev
->raid_disk
= -1;
1549 clear_bit(Faulty
, &rdev
->flags
);
1550 clear_bit(In_sync
, &rdev
->flags
);
1551 clear_bit(Bitmap_sync
, &rdev
->flags
);
1552 clear_bit(WriteMostly
, &rdev
->flags
);
1554 if (mddev
->raid_disks
== 0) {
1555 mddev
->major_version
= 1;
1556 mddev
->patch_version
= 0;
1557 mddev
->external
= 0;
1558 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1559 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1560 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1561 mddev
->level
= le32_to_cpu(sb
->level
);
1562 mddev
->clevel
[0] = 0;
1563 mddev
->layout
= le32_to_cpu(sb
->layout
);
1564 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1565 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1566 mddev
->events
= ev1
;
1567 mddev
->bitmap_info
.offset
= 0;
1568 mddev
->bitmap_info
.space
= 0;
1569 /* Default location for bitmap is 1K after superblock
1570 * using 3K - total of 4K
1572 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1573 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1574 mddev
->reshape_backwards
= 0;
1576 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1577 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1579 mddev
->max_disks
= (4096-256)/2;
1581 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1582 mddev
->bitmap_info
.file
== NULL
) {
1583 mddev
->bitmap_info
.offset
=
1584 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1585 /* Metadata doesn't record how much space is available.
1586 * For 1.0, we assume we can use up to the superblock
1587 * if before, else to 4K beyond superblock.
1588 * For others, assume no change is possible.
1590 if (mddev
->minor_version
> 0)
1591 mddev
->bitmap_info
.space
= 0;
1592 else if (mddev
->bitmap_info
.offset
> 0)
1593 mddev
->bitmap_info
.space
=
1594 8 - mddev
->bitmap_info
.offset
;
1596 mddev
->bitmap_info
.space
=
1597 -mddev
->bitmap_info
.offset
;
1600 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1601 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1602 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1603 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1604 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1605 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1606 if (mddev
->delta_disks
< 0 ||
1607 (mddev
->delta_disks
== 0 &&
1608 (le32_to_cpu(sb
->feature_map
)
1609 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1610 mddev
->reshape_backwards
= 1;
1612 mddev
->reshape_position
= MaxSector
;
1613 mddev
->delta_disks
= 0;
1614 mddev
->new_level
= mddev
->level
;
1615 mddev
->new_layout
= mddev
->layout
;
1616 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1619 } else if (mddev
->pers
== NULL
) {
1620 /* Insist of good event counter while assembling, except for
1621 * spares (which don't need an event count) */
1623 if (rdev
->desc_nr
>= 0 &&
1624 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1625 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1626 if (ev1
< mddev
->events
)
1628 } else if (mddev
->bitmap
) {
1629 /* If adding to array with a bitmap, then we can accept an
1630 * older device, but not too old.
1632 if (ev1
< mddev
->bitmap
->events_cleared
)
1634 if (ev1
< mddev
->events
)
1635 set_bit(Bitmap_sync
, &rdev
->flags
);
1637 if (ev1
< mddev
->events
)
1638 /* just a hot-add of a new device, leave raid_disk at -1 */
1641 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1643 if (rdev
->desc_nr
< 0 ||
1644 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1648 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1650 case 0xffff: /* spare */
1652 case 0xfffe: /* faulty */
1653 set_bit(Faulty
, &rdev
->flags
);
1656 rdev
->saved_raid_disk
= role
;
1657 if ((le32_to_cpu(sb
->feature_map
) &
1658 MD_FEATURE_RECOVERY_OFFSET
)) {
1659 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1660 if (!(le32_to_cpu(sb
->feature_map
) &
1661 MD_FEATURE_RECOVERY_BITMAP
))
1662 rdev
->saved_raid_disk
= -1;
1664 set_bit(In_sync
, &rdev
->flags
);
1665 rdev
->raid_disk
= role
;
1668 if (sb
->devflags
& WriteMostly1
)
1669 set_bit(WriteMostly
, &rdev
->flags
);
1670 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1671 set_bit(Replacement
, &rdev
->flags
);
1672 } else /* MULTIPATH are always insync */
1673 set_bit(In_sync
, &rdev
->flags
);
1678 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1680 struct mdp_superblock_1
*sb
;
1681 struct md_rdev
*rdev2
;
1683 /* make rdev->sb match mddev and rdev data. */
1685 sb
= page_address(rdev
->sb_page
);
1687 sb
->feature_map
= 0;
1689 sb
->recovery_offset
= cpu_to_le64(0);
1690 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1692 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1693 sb
->events
= cpu_to_le64(mddev
->events
);
1695 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1697 sb
->resync_offset
= cpu_to_le64(0);
1699 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1701 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1702 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1703 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1704 sb
->level
= cpu_to_le32(mddev
->level
);
1705 sb
->layout
= cpu_to_le32(mddev
->layout
);
1707 if (test_bit(WriteMostly
, &rdev
->flags
))
1708 sb
->devflags
|= WriteMostly1
;
1710 sb
->devflags
&= ~WriteMostly1
;
1711 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1712 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1714 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1715 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1716 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1719 if (rdev
->raid_disk
>= 0 &&
1720 !test_bit(In_sync
, &rdev
->flags
)) {
1722 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1723 sb
->recovery_offset
=
1724 cpu_to_le64(rdev
->recovery_offset
);
1725 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1727 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1729 if (test_bit(Replacement
, &rdev
->flags
))
1731 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1733 if (mddev
->reshape_position
!= MaxSector
) {
1734 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1735 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1736 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1737 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1738 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1739 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1740 if (mddev
->delta_disks
== 0 &&
1741 mddev
->reshape_backwards
)
1743 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1744 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1746 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1747 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1748 - rdev
->data_offset
));
1752 if (rdev
->badblocks
.count
== 0)
1753 /* Nothing to do for bad blocks*/ ;
1754 else if (sb
->bblog_offset
== 0)
1755 /* Cannot record bad blocks on this device */
1756 md_error(mddev
, rdev
);
1758 struct badblocks
*bb
= &rdev
->badblocks
;
1759 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1761 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1766 seq
= read_seqbegin(&bb
->lock
);
1768 memset(bbp
, 0xff, PAGE_SIZE
);
1770 for (i
= 0 ; i
< bb
->count
; i
++) {
1771 u64 internal_bb
= p
[i
];
1772 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1773 | BB_LEN(internal_bb
));
1774 bbp
[i
] = cpu_to_le64(store_bb
);
1777 if (read_seqretry(&bb
->lock
, seq
))
1780 bb
->sector
= (rdev
->sb_start
+
1781 (int)le32_to_cpu(sb
->bblog_offset
));
1782 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1787 rdev_for_each(rdev2
, mddev
)
1788 if (rdev2
->desc_nr
+1 > max_dev
)
1789 max_dev
= rdev2
->desc_nr
+1;
1791 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1793 sb
->max_dev
= cpu_to_le32(max_dev
);
1794 rdev
->sb_size
= max_dev
* 2 + 256;
1795 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1796 if (rdev
->sb_size
& bmask
)
1797 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1799 max_dev
= le32_to_cpu(sb
->max_dev
);
1801 for (i
=0; i
<max_dev
;i
++)
1802 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1804 rdev_for_each(rdev2
, mddev
) {
1806 if (test_bit(Faulty
, &rdev2
->flags
))
1807 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1808 else if (test_bit(In_sync
, &rdev2
->flags
))
1809 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1810 else if (rdev2
->raid_disk
>= 0)
1811 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1813 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1816 sb
->sb_csum
= calc_sb_1_csum(sb
);
1819 static unsigned long long
1820 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1822 struct mdp_superblock_1
*sb
;
1823 sector_t max_sectors
;
1824 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1825 return 0; /* component must fit device */
1826 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1827 return 0; /* too confusing */
1828 if (rdev
->sb_start
< rdev
->data_offset
) {
1829 /* minor versions 1 and 2; superblock before data */
1830 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1831 max_sectors
-= rdev
->data_offset
;
1832 if (!num_sectors
|| num_sectors
> max_sectors
)
1833 num_sectors
= max_sectors
;
1834 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1835 /* minor version 0 with bitmap we can't move */
1838 /* minor version 0; superblock after data */
1840 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1841 sb_start
&= ~(sector_t
)(4*2 - 1);
1842 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1843 if (!num_sectors
|| num_sectors
> max_sectors
)
1844 num_sectors
= max_sectors
;
1845 rdev
->sb_start
= sb_start
;
1847 sb
= page_address(rdev
->sb_page
);
1848 sb
->data_size
= cpu_to_le64(num_sectors
);
1849 sb
->super_offset
= rdev
->sb_start
;
1850 sb
->sb_csum
= calc_sb_1_csum(sb
);
1851 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1853 md_super_wait(rdev
->mddev
);
1859 super_1_allow_new_offset(struct md_rdev
*rdev
,
1860 unsigned long long new_offset
)
1862 /* All necessary checks on new >= old have been done */
1863 struct bitmap
*bitmap
;
1864 if (new_offset
>= rdev
->data_offset
)
1867 /* with 1.0 metadata, there is no metadata to tread on
1868 * so we can always move back */
1869 if (rdev
->mddev
->minor_version
== 0)
1872 /* otherwise we must be sure not to step on
1873 * any metadata, so stay:
1874 * 36K beyond start of superblock
1875 * beyond end of badblocks
1876 * beyond write-intent bitmap
1878 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1880 bitmap
= rdev
->mddev
->bitmap
;
1881 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1882 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1883 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1885 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1891 static struct super_type super_types
[] = {
1894 .owner
= THIS_MODULE
,
1895 .load_super
= super_90_load
,
1896 .validate_super
= super_90_validate
,
1897 .sync_super
= super_90_sync
,
1898 .rdev_size_change
= super_90_rdev_size_change
,
1899 .allow_new_offset
= super_90_allow_new_offset
,
1903 .owner
= THIS_MODULE
,
1904 .load_super
= super_1_load
,
1905 .validate_super
= super_1_validate
,
1906 .sync_super
= super_1_sync
,
1907 .rdev_size_change
= super_1_rdev_size_change
,
1908 .allow_new_offset
= super_1_allow_new_offset
,
1912 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1914 if (mddev
->sync_super
) {
1915 mddev
->sync_super(mddev
, rdev
);
1919 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1921 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1924 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1926 struct md_rdev
*rdev
, *rdev2
;
1929 rdev_for_each_rcu(rdev
, mddev1
)
1930 rdev_for_each_rcu(rdev2
, mddev2
)
1931 if (rdev
->bdev
->bd_contains
==
1932 rdev2
->bdev
->bd_contains
) {
1940 static LIST_HEAD(pending_raid_disks
);
1943 * Try to register data integrity profile for an mddev
1945 * This is called when an array is started and after a disk has been kicked
1946 * from the array. It only succeeds if all working and active component devices
1947 * are integrity capable with matching profiles.
1949 int md_integrity_register(struct mddev
*mddev
)
1951 struct md_rdev
*rdev
, *reference
= NULL
;
1953 if (list_empty(&mddev
->disks
))
1954 return 0; /* nothing to do */
1955 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1956 return 0; /* shouldn't register, or already is */
1957 rdev_for_each(rdev
, mddev
) {
1958 /* skip spares and non-functional disks */
1959 if (test_bit(Faulty
, &rdev
->flags
))
1961 if (rdev
->raid_disk
< 0)
1964 /* Use the first rdev as the reference */
1968 /* does this rdev's profile match the reference profile? */
1969 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1970 rdev
->bdev
->bd_disk
) < 0)
1973 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1976 * All component devices are integrity capable and have matching
1977 * profiles, register the common profile for the md device.
1979 if (blk_integrity_register(mddev
->gendisk
,
1980 bdev_get_integrity(reference
->bdev
)) != 0) {
1981 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1985 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1986 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1987 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1993 EXPORT_SYMBOL(md_integrity_register
);
1995 /* Disable data integrity if non-capable/non-matching disk is being added */
1996 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1998 struct blk_integrity
*bi_rdev
;
1999 struct blk_integrity
*bi_mddev
;
2001 if (!mddev
->gendisk
)
2004 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2005 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2007 if (!bi_mddev
) /* nothing to do */
2009 if (rdev
->raid_disk
< 0) /* skip spares */
2011 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2012 rdev
->bdev
->bd_disk
) >= 0)
2014 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2015 blk_integrity_unregister(mddev
->gendisk
);
2017 EXPORT_SYMBOL(md_integrity_add_rdev
);
2019 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2021 char b
[BDEVNAME_SIZE
];
2026 /* prevent duplicates */
2027 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2030 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2031 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2032 rdev
->sectors
< mddev
->dev_sectors
)) {
2034 /* Cannot change size, so fail
2035 * If mddev->level <= 0, then we don't care
2036 * about aligning sizes (e.g. linear)
2038 if (mddev
->level
> 0)
2041 mddev
->dev_sectors
= rdev
->sectors
;
2044 /* Verify rdev->desc_nr is unique.
2045 * If it is -1, assign a free number, else
2046 * check number is not in use
2049 if (rdev
->desc_nr
< 0) {
2052 choice
= mddev
->raid_disks
;
2053 while (md_find_rdev_nr_rcu(mddev
, choice
))
2055 rdev
->desc_nr
= choice
;
2057 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2063 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2064 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2065 mdname(mddev
), mddev
->max_disks
);
2068 bdevname(rdev
->bdev
,b
);
2069 while ( (s
=strchr(b
, '/')) != NULL
)
2072 rdev
->mddev
= mddev
;
2073 printk(KERN_INFO
"md: bind<%s>\n", b
);
2075 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2078 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2079 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2080 /* failure here is OK */;
2081 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2083 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2084 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2086 /* May as well allow recovery to be retried once */
2087 mddev
->recovery_disabled
++;
2092 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2097 static void md_delayed_delete(struct work_struct
*ws
)
2099 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2100 kobject_del(&rdev
->kobj
);
2101 kobject_put(&rdev
->kobj
);
2104 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2106 char b
[BDEVNAME_SIZE
];
2108 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2109 list_del_rcu(&rdev
->same_set
);
2110 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2112 sysfs_remove_link(&rdev
->kobj
, "block");
2113 sysfs_put(rdev
->sysfs_state
);
2114 rdev
->sysfs_state
= NULL
;
2115 rdev
->badblocks
.count
= 0;
2116 /* We need to delay this, otherwise we can deadlock when
2117 * writing to 'remove' to "dev/state". We also need
2118 * to delay it due to rcu usage.
2121 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2122 kobject_get(&rdev
->kobj
);
2123 queue_work(md_misc_wq
, &rdev
->del_work
);
2127 * prevent the device from being mounted, repartitioned or
2128 * otherwise reused by a RAID array (or any other kernel
2129 * subsystem), by bd_claiming the device.
2131 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2134 struct block_device
*bdev
;
2135 char b
[BDEVNAME_SIZE
];
2137 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2138 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2140 printk(KERN_ERR
"md: could not open %s.\n",
2141 __bdevname(dev
, b
));
2142 return PTR_ERR(bdev
);
2148 static void unlock_rdev(struct md_rdev
*rdev
)
2150 struct block_device
*bdev
= rdev
->bdev
;
2152 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2155 void md_autodetect_dev(dev_t dev
);
2157 static void export_rdev(struct md_rdev
*rdev
)
2159 char b
[BDEVNAME_SIZE
];
2161 printk(KERN_INFO
"md: export_rdev(%s)\n",
2162 bdevname(rdev
->bdev
,b
));
2163 md_rdev_clear(rdev
);
2165 if (test_bit(AutoDetected
, &rdev
->flags
))
2166 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2169 kobject_put(&rdev
->kobj
);
2172 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2174 unbind_rdev_from_array(rdev
);
2177 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2179 static void export_array(struct mddev
*mddev
)
2181 struct md_rdev
*rdev
;
2183 while (!list_empty(&mddev
->disks
)) {
2184 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2186 md_kick_rdev_from_array(rdev
);
2188 mddev
->raid_disks
= 0;
2189 mddev
->major_version
= 0;
2192 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2194 /* Update each superblock (in-memory image), but
2195 * if we are allowed to, skip spares which already
2196 * have the right event counter, or have one earlier
2197 * (which would mean they aren't being marked as dirty
2198 * with the rest of the array)
2200 struct md_rdev
*rdev
;
2201 rdev_for_each(rdev
, mddev
) {
2202 if (rdev
->sb_events
== mddev
->events
||
2204 rdev
->raid_disk
< 0 &&
2205 rdev
->sb_events
+1 == mddev
->events
)) {
2206 /* Don't update this superblock */
2207 rdev
->sb_loaded
= 2;
2209 sync_super(mddev
, rdev
);
2210 rdev
->sb_loaded
= 1;
2215 void md_update_sb(struct mddev
*mddev
, int force_change
)
2217 struct md_rdev
*rdev
;
2220 int any_badblocks_changed
= 0;
2224 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2228 /* First make sure individual recovery_offsets are correct */
2229 rdev_for_each(rdev
, mddev
) {
2230 if (rdev
->raid_disk
>= 0 &&
2231 mddev
->delta_disks
>= 0 &&
2232 !test_bit(In_sync
, &rdev
->flags
) &&
2233 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2234 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2237 if (!mddev
->persistent
) {
2238 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2239 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2240 if (!mddev
->external
) {
2241 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2242 rdev_for_each(rdev
, mddev
) {
2243 if (rdev
->badblocks
.changed
) {
2244 rdev
->badblocks
.changed
= 0;
2245 md_ack_all_badblocks(&rdev
->badblocks
);
2246 md_error(mddev
, rdev
);
2248 clear_bit(Blocked
, &rdev
->flags
);
2249 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2250 wake_up(&rdev
->blocked_wait
);
2253 wake_up(&mddev
->sb_wait
);
2257 spin_lock(&mddev
->lock
);
2259 mddev
->utime
= get_seconds();
2261 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2263 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2264 /* just a clean<-> dirty transition, possibly leave spares alone,
2265 * though if events isn't the right even/odd, we will have to do
2271 if (mddev
->degraded
)
2272 /* If the array is degraded, then skipping spares is both
2273 * dangerous and fairly pointless.
2274 * Dangerous because a device that was removed from the array
2275 * might have a event_count that still looks up-to-date,
2276 * so it can be re-added without a resync.
2277 * Pointless because if there are any spares to skip,
2278 * then a recovery will happen and soon that array won't
2279 * be degraded any more and the spare can go back to sleep then.
2283 sync_req
= mddev
->in_sync
;
2285 /* If this is just a dirty<->clean transition, and the array is clean
2286 * and 'events' is odd, we can roll back to the previous clean state */
2288 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2289 && mddev
->can_decrease_events
2290 && mddev
->events
!= 1) {
2292 mddev
->can_decrease_events
= 0;
2294 /* otherwise we have to go forward and ... */
2296 mddev
->can_decrease_events
= nospares
;
2300 * This 64-bit counter should never wrap.
2301 * Either we are in around ~1 trillion A.C., assuming
2302 * 1 reboot per second, or we have a bug...
2304 WARN_ON(mddev
->events
== 0);
2306 rdev_for_each(rdev
, mddev
) {
2307 if (rdev
->badblocks
.changed
)
2308 any_badblocks_changed
++;
2309 if (test_bit(Faulty
, &rdev
->flags
))
2310 set_bit(FaultRecorded
, &rdev
->flags
);
2313 sync_sbs(mddev
, nospares
);
2314 spin_unlock(&mddev
->lock
);
2316 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2317 mdname(mddev
), mddev
->in_sync
);
2319 bitmap_update_sb(mddev
->bitmap
);
2320 rdev_for_each(rdev
, mddev
) {
2321 char b
[BDEVNAME_SIZE
];
2323 if (rdev
->sb_loaded
!= 1)
2324 continue; /* no noise on spare devices */
2326 if (!test_bit(Faulty
, &rdev
->flags
)) {
2327 md_super_write(mddev
,rdev
,
2328 rdev
->sb_start
, rdev
->sb_size
,
2330 pr_debug("md: (write) %s's sb offset: %llu\n",
2331 bdevname(rdev
->bdev
, b
),
2332 (unsigned long long)rdev
->sb_start
);
2333 rdev
->sb_events
= mddev
->events
;
2334 if (rdev
->badblocks
.size
) {
2335 md_super_write(mddev
, rdev
,
2336 rdev
->badblocks
.sector
,
2337 rdev
->badblocks
.size
<< 9,
2339 rdev
->badblocks
.size
= 0;
2343 pr_debug("md: %s (skipping faulty)\n",
2344 bdevname(rdev
->bdev
, b
));
2346 if (mddev
->level
== LEVEL_MULTIPATH
)
2347 /* only need to write one superblock... */
2350 md_super_wait(mddev
);
2351 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2353 spin_lock(&mddev
->lock
);
2354 if (mddev
->in_sync
!= sync_req
||
2355 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2356 /* have to write it out again */
2357 spin_unlock(&mddev
->lock
);
2360 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2361 spin_unlock(&mddev
->lock
);
2362 wake_up(&mddev
->sb_wait
);
2363 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2364 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2366 rdev_for_each(rdev
, mddev
) {
2367 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2368 clear_bit(Blocked
, &rdev
->flags
);
2370 if (any_badblocks_changed
)
2371 md_ack_all_badblocks(&rdev
->badblocks
);
2372 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2373 wake_up(&rdev
->blocked_wait
);
2376 EXPORT_SYMBOL(md_update_sb
);
2378 /* words written to sysfs files may, or may not, be \n terminated.
2379 * We want to accept with case. For this we use cmd_match.
2381 static int cmd_match(const char *cmd
, const char *str
)
2383 /* See if cmd, written into a sysfs file, matches
2384 * str. They must either be the same, or cmd can
2385 * have a trailing newline
2387 while (*cmd
&& *str
&& *cmd
== *str
) {
2398 struct rdev_sysfs_entry
{
2399 struct attribute attr
;
2400 ssize_t (*show
)(struct md_rdev
*, char *);
2401 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2405 state_show(struct md_rdev
*rdev
, char *page
)
2409 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2411 if (test_bit(Faulty
, &flags
) ||
2412 rdev
->badblocks
.unacked_exist
) {
2413 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2416 if (test_bit(In_sync
, &flags
)) {
2417 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2420 if (test_bit(WriteMostly
, &flags
)) {
2421 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2424 if (test_bit(Blocked
, &flags
) ||
2425 (rdev
->badblocks
.unacked_exist
2426 && !test_bit(Faulty
, &flags
))) {
2427 len
+= sprintf(page
+len
, "%sblocked", sep
);
2430 if (!test_bit(Faulty
, &flags
) &&
2431 !test_bit(In_sync
, &flags
)) {
2432 len
+= sprintf(page
+len
, "%sspare", sep
);
2435 if (test_bit(WriteErrorSeen
, &flags
)) {
2436 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2439 if (test_bit(WantReplacement
, &flags
)) {
2440 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2443 if (test_bit(Replacement
, &flags
)) {
2444 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2448 return len
+sprintf(page
+len
, "\n");
2452 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2455 * faulty - simulates an error
2456 * remove - disconnects the device
2457 * writemostly - sets write_mostly
2458 * -writemostly - clears write_mostly
2459 * blocked - sets the Blocked flags
2460 * -blocked - clears the Blocked and possibly simulates an error
2461 * insync - sets Insync providing device isn't active
2462 * -insync - clear Insync for a device with a slot assigned,
2463 * so that it gets rebuilt based on bitmap
2464 * write_error - sets WriteErrorSeen
2465 * -write_error - clears WriteErrorSeen
2468 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2469 md_error(rdev
->mddev
, rdev
);
2470 if (test_bit(Faulty
, &rdev
->flags
))
2474 } else if (cmd_match(buf
, "remove")) {
2475 if (rdev
->raid_disk
>= 0)
2478 struct mddev
*mddev
= rdev
->mddev
;
2479 if (mddev_is_clustered(mddev
))
2480 md_cluster_ops
->remove_disk(mddev
, rdev
);
2481 md_kick_rdev_from_array(rdev
);
2482 if (mddev_is_clustered(mddev
))
2483 md_cluster_ops
->metadata_update_start(mddev
);
2485 md_update_sb(mddev
, 1);
2486 md_new_event(mddev
);
2487 if (mddev_is_clustered(mddev
))
2488 md_cluster_ops
->metadata_update_finish(mddev
);
2491 } else if (cmd_match(buf
, "writemostly")) {
2492 set_bit(WriteMostly
, &rdev
->flags
);
2494 } else if (cmd_match(buf
, "-writemostly")) {
2495 clear_bit(WriteMostly
, &rdev
->flags
);
2497 } else if (cmd_match(buf
, "blocked")) {
2498 set_bit(Blocked
, &rdev
->flags
);
2500 } else if (cmd_match(buf
, "-blocked")) {
2501 if (!test_bit(Faulty
, &rdev
->flags
) &&
2502 rdev
->badblocks
.unacked_exist
) {
2503 /* metadata handler doesn't understand badblocks,
2504 * so we need to fail the device
2506 md_error(rdev
->mddev
, rdev
);
2508 clear_bit(Blocked
, &rdev
->flags
);
2509 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2510 wake_up(&rdev
->blocked_wait
);
2511 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2512 md_wakeup_thread(rdev
->mddev
->thread
);
2515 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2516 set_bit(In_sync
, &rdev
->flags
);
2518 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2519 if (rdev
->mddev
->pers
== NULL
) {
2520 clear_bit(In_sync
, &rdev
->flags
);
2521 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2522 rdev
->raid_disk
= -1;
2525 } else if (cmd_match(buf
, "write_error")) {
2526 set_bit(WriteErrorSeen
, &rdev
->flags
);
2528 } else if (cmd_match(buf
, "-write_error")) {
2529 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2531 } else if (cmd_match(buf
, "want_replacement")) {
2532 /* Any non-spare device that is not a replacement can
2533 * become want_replacement at any time, but we then need to
2534 * check if recovery is needed.
2536 if (rdev
->raid_disk
>= 0 &&
2537 !test_bit(Replacement
, &rdev
->flags
))
2538 set_bit(WantReplacement
, &rdev
->flags
);
2539 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2540 md_wakeup_thread(rdev
->mddev
->thread
);
2542 } else if (cmd_match(buf
, "-want_replacement")) {
2543 /* Clearing 'want_replacement' is always allowed.
2544 * Once replacements starts it is too late though.
2547 clear_bit(WantReplacement
, &rdev
->flags
);
2548 } else if (cmd_match(buf
, "replacement")) {
2549 /* Can only set a device as a replacement when array has not
2550 * yet been started. Once running, replacement is automatic
2551 * from spares, or by assigning 'slot'.
2553 if (rdev
->mddev
->pers
)
2556 set_bit(Replacement
, &rdev
->flags
);
2559 } else if (cmd_match(buf
, "-replacement")) {
2560 /* Similarly, can only clear Replacement before start */
2561 if (rdev
->mddev
->pers
)
2564 clear_bit(Replacement
, &rdev
->flags
);
2569 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2570 return err
? err
: len
;
2572 static struct rdev_sysfs_entry rdev_state
=
2573 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2576 errors_show(struct md_rdev
*rdev
, char *page
)
2578 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2582 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2585 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2586 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2587 atomic_set(&rdev
->corrected_errors
, n
);
2592 static struct rdev_sysfs_entry rdev_errors
=
2593 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2596 slot_show(struct md_rdev
*rdev
, char *page
)
2598 if (rdev
->raid_disk
< 0)
2599 return sprintf(page
, "none\n");
2601 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2605 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2609 int slot
= simple_strtoul(buf
, &e
, 10);
2610 if (strncmp(buf
, "none", 4)==0)
2612 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2614 if (rdev
->mddev
->pers
&& slot
== -1) {
2615 /* Setting 'slot' on an active array requires also
2616 * updating the 'rd%d' link, and communicating
2617 * with the personality with ->hot_*_disk.
2618 * For now we only support removing
2619 * failed/spare devices. This normally happens automatically,
2620 * but not when the metadata is externally managed.
2622 if (rdev
->raid_disk
== -1)
2624 /* personality does all needed checks */
2625 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2627 clear_bit(Blocked
, &rdev
->flags
);
2628 remove_and_add_spares(rdev
->mddev
, rdev
);
2629 if (rdev
->raid_disk
>= 0)
2631 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2632 md_wakeup_thread(rdev
->mddev
->thread
);
2633 } else if (rdev
->mddev
->pers
) {
2634 /* Activating a spare .. or possibly reactivating
2635 * if we ever get bitmaps working here.
2638 if (rdev
->raid_disk
!= -1)
2641 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2644 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2647 if (slot
>= rdev
->mddev
->raid_disks
&&
2648 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2651 rdev
->raid_disk
= slot
;
2652 if (test_bit(In_sync
, &rdev
->flags
))
2653 rdev
->saved_raid_disk
= slot
;
2655 rdev
->saved_raid_disk
= -1;
2656 clear_bit(In_sync
, &rdev
->flags
);
2657 clear_bit(Bitmap_sync
, &rdev
->flags
);
2658 err
= rdev
->mddev
->pers
->
2659 hot_add_disk(rdev
->mddev
, rdev
);
2661 rdev
->raid_disk
= -1;
2664 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2665 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2666 /* failure here is OK */;
2667 /* don't wakeup anyone, leave that to userspace. */
2669 if (slot
>= rdev
->mddev
->raid_disks
&&
2670 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2672 rdev
->raid_disk
= slot
;
2673 /* assume it is working */
2674 clear_bit(Faulty
, &rdev
->flags
);
2675 clear_bit(WriteMostly
, &rdev
->flags
);
2676 set_bit(In_sync
, &rdev
->flags
);
2677 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2682 static struct rdev_sysfs_entry rdev_slot
=
2683 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2686 offset_show(struct md_rdev
*rdev
, char *page
)
2688 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2692 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2694 unsigned long long offset
;
2695 if (kstrtoull(buf
, 10, &offset
) < 0)
2697 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2699 if (rdev
->sectors
&& rdev
->mddev
->external
)
2700 /* Must set offset before size, so overlap checks
2703 rdev
->data_offset
= offset
;
2704 rdev
->new_data_offset
= offset
;
2708 static struct rdev_sysfs_entry rdev_offset
=
2709 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2711 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2713 return sprintf(page
, "%llu\n",
2714 (unsigned long long)rdev
->new_data_offset
);
2717 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2718 const char *buf
, size_t len
)
2720 unsigned long long new_offset
;
2721 struct mddev
*mddev
= rdev
->mddev
;
2723 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2726 if (mddev
->sync_thread
||
2727 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2729 if (new_offset
== rdev
->data_offset
)
2730 /* reset is always permitted */
2732 else if (new_offset
> rdev
->data_offset
) {
2733 /* must not push array size beyond rdev_sectors */
2734 if (new_offset
- rdev
->data_offset
2735 + mddev
->dev_sectors
> rdev
->sectors
)
2738 /* Metadata worries about other space details. */
2740 /* decreasing the offset is inconsistent with a backwards
2743 if (new_offset
< rdev
->data_offset
&&
2744 mddev
->reshape_backwards
)
2746 /* Increasing offset is inconsistent with forwards
2747 * reshape. reshape_direction should be set to
2748 * 'backwards' first.
2750 if (new_offset
> rdev
->data_offset
&&
2751 !mddev
->reshape_backwards
)
2754 if (mddev
->pers
&& mddev
->persistent
&&
2755 !super_types
[mddev
->major_version
]
2756 .allow_new_offset(rdev
, new_offset
))
2758 rdev
->new_data_offset
= new_offset
;
2759 if (new_offset
> rdev
->data_offset
)
2760 mddev
->reshape_backwards
= 1;
2761 else if (new_offset
< rdev
->data_offset
)
2762 mddev
->reshape_backwards
= 0;
2766 static struct rdev_sysfs_entry rdev_new_offset
=
2767 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2770 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2772 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2775 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2777 /* check if two start/length pairs overlap */
2785 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2787 unsigned long long blocks
;
2790 if (kstrtoull(buf
, 10, &blocks
) < 0)
2793 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2794 return -EINVAL
; /* sector conversion overflow */
2797 if (new != blocks
* 2)
2798 return -EINVAL
; /* unsigned long long to sector_t overflow */
2805 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2807 struct mddev
*my_mddev
= rdev
->mddev
;
2808 sector_t oldsectors
= rdev
->sectors
;
2811 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2813 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2814 return -EINVAL
; /* too confusing */
2815 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2816 if (my_mddev
->persistent
) {
2817 sectors
= super_types
[my_mddev
->major_version
].
2818 rdev_size_change(rdev
, sectors
);
2821 } else if (!sectors
)
2822 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2824 if (!my_mddev
->pers
->resize
)
2825 /* Cannot change size for RAID0 or Linear etc */
2828 if (sectors
< my_mddev
->dev_sectors
)
2829 return -EINVAL
; /* component must fit device */
2831 rdev
->sectors
= sectors
;
2832 if (sectors
> oldsectors
&& my_mddev
->external
) {
2833 /* Need to check that all other rdevs with the same
2834 * ->bdev do not overlap. 'rcu' is sufficient to walk
2835 * the rdev lists safely.
2836 * This check does not provide a hard guarantee, it
2837 * just helps avoid dangerous mistakes.
2839 struct mddev
*mddev
;
2841 struct list_head
*tmp
;
2844 for_each_mddev(mddev
, tmp
) {
2845 struct md_rdev
*rdev2
;
2847 rdev_for_each(rdev2
, mddev
)
2848 if (rdev
->bdev
== rdev2
->bdev
&&
2850 overlaps(rdev
->data_offset
, rdev
->sectors
,
2863 /* Someone else could have slipped in a size
2864 * change here, but doing so is just silly.
2865 * We put oldsectors back because we *know* it is
2866 * safe, and trust userspace not to race with
2869 rdev
->sectors
= oldsectors
;
2876 static struct rdev_sysfs_entry rdev_size
=
2877 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2879 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
2881 unsigned long long recovery_start
= rdev
->recovery_offset
;
2883 if (test_bit(In_sync
, &rdev
->flags
) ||
2884 recovery_start
== MaxSector
)
2885 return sprintf(page
, "none\n");
2887 return sprintf(page
, "%llu\n", recovery_start
);
2890 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2892 unsigned long long recovery_start
;
2894 if (cmd_match(buf
, "none"))
2895 recovery_start
= MaxSector
;
2896 else if (kstrtoull(buf
, 10, &recovery_start
))
2899 if (rdev
->mddev
->pers
&&
2900 rdev
->raid_disk
>= 0)
2903 rdev
->recovery_offset
= recovery_start
;
2904 if (recovery_start
== MaxSector
)
2905 set_bit(In_sync
, &rdev
->flags
);
2907 clear_bit(In_sync
, &rdev
->flags
);
2911 static struct rdev_sysfs_entry rdev_recovery_start
=
2912 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2915 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
2917 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
2919 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
2921 return badblocks_show(&rdev
->badblocks
, page
, 0);
2923 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2925 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
2926 /* Maybe that ack was all we needed */
2927 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
2928 wake_up(&rdev
->blocked_wait
);
2931 static struct rdev_sysfs_entry rdev_bad_blocks
=
2932 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
2934 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
2936 return badblocks_show(&rdev
->badblocks
, page
, 1);
2938 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
2940 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
2942 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
2943 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
2945 static struct attribute
*rdev_default_attrs
[] = {
2950 &rdev_new_offset
.attr
,
2952 &rdev_recovery_start
.attr
,
2953 &rdev_bad_blocks
.attr
,
2954 &rdev_unack_bad_blocks
.attr
,
2958 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2960 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2961 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2967 return entry
->show(rdev
, page
);
2971 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2972 const char *page
, size_t length
)
2974 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2975 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
2977 struct mddev
*mddev
= rdev
->mddev
;
2981 if (!capable(CAP_SYS_ADMIN
))
2983 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2985 if (rdev
->mddev
== NULL
)
2988 rv
= entry
->store(rdev
, page
, length
);
2989 mddev_unlock(mddev
);
2994 static void rdev_free(struct kobject
*ko
)
2996 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
2999 static const struct sysfs_ops rdev_sysfs_ops
= {
3000 .show
= rdev_attr_show
,
3001 .store
= rdev_attr_store
,
3003 static struct kobj_type rdev_ktype
= {
3004 .release
= rdev_free
,
3005 .sysfs_ops
= &rdev_sysfs_ops
,
3006 .default_attrs
= rdev_default_attrs
,
3009 int md_rdev_init(struct md_rdev
*rdev
)
3012 rdev
->saved_raid_disk
= -1;
3013 rdev
->raid_disk
= -1;
3015 rdev
->data_offset
= 0;
3016 rdev
->new_data_offset
= 0;
3017 rdev
->sb_events
= 0;
3018 rdev
->last_read_error
.tv_sec
= 0;
3019 rdev
->last_read_error
.tv_nsec
= 0;
3020 rdev
->sb_loaded
= 0;
3021 rdev
->bb_page
= NULL
;
3022 atomic_set(&rdev
->nr_pending
, 0);
3023 atomic_set(&rdev
->read_errors
, 0);
3024 atomic_set(&rdev
->corrected_errors
, 0);
3026 INIT_LIST_HEAD(&rdev
->same_set
);
3027 init_waitqueue_head(&rdev
->blocked_wait
);
3029 /* Add space to store bad block list.
3030 * This reserves the space even on arrays where it cannot
3031 * be used - I wonder if that matters
3033 rdev
->badblocks
.count
= 0;
3034 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3035 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3036 seqlock_init(&rdev
->badblocks
.lock
);
3037 if (rdev
->badblocks
.page
== NULL
)
3042 EXPORT_SYMBOL_GPL(md_rdev_init
);
3044 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3046 * mark the device faulty if:
3048 * - the device is nonexistent (zero size)
3049 * - the device has no valid superblock
3051 * a faulty rdev _never_ has rdev->sb set.
3053 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3055 char b
[BDEVNAME_SIZE
];
3057 struct md_rdev
*rdev
;
3060 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3062 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3063 return ERR_PTR(-ENOMEM
);
3066 err
= md_rdev_init(rdev
);
3069 err
= alloc_disk_sb(rdev
);
3073 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3077 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3079 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3082 "md: %s has zero or unknown size, marking faulty!\n",
3083 bdevname(rdev
->bdev
,b
));
3088 if (super_format
>= 0) {
3089 err
= super_types
[super_format
].
3090 load_super(rdev
, NULL
, super_minor
);
3091 if (err
== -EINVAL
) {
3093 "md: %s does not have a valid v%d.%d "
3094 "superblock, not importing!\n",
3095 bdevname(rdev
->bdev
,b
),
3096 super_format
, super_minor
);
3101 "md: could not read %s's sb, not importing!\n",
3102 bdevname(rdev
->bdev
,b
));
3112 md_rdev_clear(rdev
);
3114 return ERR_PTR(err
);
3118 * Check a full RAID array for plausibility
3121 static void analyze_sbs(struct mddev
*mddev
)
3124 struct md_rdev
*rdev
, *freshest
, *tmp
;
3125 char b
[BDEVNAME_SIZE
];
3128 rdev_for_each_safe(rdev
, tmp
, mddev
)
3129 switch (super_types
[mddev
->major_version
].
3130 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3138 "md: fatal superblock inconsistency in %s"
3139 " -- removing from array\n",
3140 bdevname(rdev
->bdev
,b
));
3141 md_kick_rdev_from_array(rdev
);
3144 super_types
[mddev
->major_version
].
3145 validate_super(mddev
, freshest
);
3148 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3149 if (mddev
->max_disks
&&
3150 (rdev
->desc_nr
>= mddev
->max_disks
||
3151 i
> mddev
->max_disks
)) {
3153 "md: %s: %s: only %d devices permitted\n",
3154 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3156 md_kick_rdev_from_array(rdev
);
3159 if (rdev
!= freshest
) {
3160 if (super_types
[mddev
->major_version
].
3161 validate_super(mddev
, rdev
)) {
3162 printk(KERN_WARNING
"md: kicking non-fresh %s"
3164 bdevname(rdev
->bdev
,b
));
3165 md_kick_rdev_from_array(rdev
);
3168 /* No device should have a Candidate flag
3169 * when reading devices
3171 if (test_bit(Candidate
, &rdev
->flags
)) {
3172 pr_info("md: kicking Cluster Candidate %s from array!\n",
3173 bdevname(rdev
->bdev
, b
));
3174 md_kick_rdev_from_array(rdev
);
3177 if (mddev
->level
== LEVEL_MULTIPATH
) {
3178 rdev
->desc_nr
= i
++;
3179 rdev
->raid_disk
= rdev
->desc_nr
;
3180 set_bit(In_sync
, &rdev
->flags
);
3181 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3182 rdev
->raid_disk
= -1;
3183 clear_bit(In_sync
, &rdev
->flags
);
3188 /* Read a fixed-point number.
3189 * Numbers in sysfs attributes should be in "standard" units where
3190 * possible, so time should be in seconds.
3191 * However we internally use a a much smaller unit such as
3192 * milliseconds or jiffies.
3193 * This function takes a decimal number with a possible fractional
3194 * component, and produces an integer which is the result of
3195 * multiplying that number by 10^'scale'.
3196 * all without any floating-point arithmetic.
3198 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3200 unsigned long result
= 0;
3202 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3205 else if (decimals
< scale
) {
3208 result
= result
* 10 + value
;
3220 while (decimals
< scale
) {
3228 static void md_safemode_timeout(unsigned long data
);
3231 safe_delay_show(struct mddev
*mddev
, char *page
)
3233 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3234 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3237 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3241 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3244 mddev
->safemode_delay
= 0;
3246 unsigned long old_delay
= mddev
->safemode_delay
;
3247 unsigned long new_delay
= (msec
*HZ
)/1000;
3251 mddev
->safemode_delay
= new_delay
;
3252 if (new_delay
< old_delay
|| old_delay
== 0)
3253 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3257 static struct md_sysfs_entry md_safe_delay
=
3258 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3261 level_show(struct mddev
*mddev
, char *page
)
3263 struct md_personality
*p
;
3265 spin_lock(&mddev
->lock
);
3268 ret
= sprintf(page
, "%s\n", p
->name
);
3269 else if (mddev
->clevel
[0])
3270 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3271 else if (mddev
->level
!= LEVEL_NONE
)
3272 ret
= sprintf(page
, "%d\n", mddev
->level
);
3275 spin_unlock(&mddev
->lock
);
3280 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3285 struct md_personality
*pers
, *oldpers
;
3287 void *priv
, *oldpriv
;
3288 struct md_rdev
*rdev
;
3290 if (slen
== 0 || slen
>= sizeof(clevel
))
3293 rv
= mddev_lock(mddev
);
3297 if (mddev
->pers
== NULL
) {
3298 strncpy(mddev
->clevel
, buf
, slen
);
3299 if (mddev
->clevel
[slen
-1] == '\n')
3301 mddev
->clevel
[slen
] = 0;
3302 mddev
->level
= LEVEL_NONE
;
3310 /* request to change the personality. Need to ensure:
3311 * - array is not engaged in resync/recovery/reshape
3312 * - old personality can be suspended
3313 * - new personality will access other array.
3317 if (mddev
->sync_thread
||
3318 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3319 mddev
->reshape_position
!= MaxSector
||
3320 mddev
->sysfs_active
)
3324 if (!mddev
->pers
->quiesce
) {
3325 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3326 mdname(mddev
), mddev
->pers
->name
);
3330 /* Now find the new personality */
3331 strncpy(clevel
, buf
, slen
);
3332 if (clevel
[slen
-1] == '\n')
3335 if (kstrtol(clevel
, 10, &level
))
3338 if (request_module("md-%s", clevel
) != 0)
3339 request_module("md-level-%s", clevel
);
3340 spin_lock(&pers_lock
);
3341 pers
= find_pers(level
, clevel
);
3342 if (!pers
|| !try_module_get(pers
->owner
)) {
3343 spin_unlock(&pers_lock
);
3344 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3348 spin_unlock(&pers_lock
);
3350 if (pers
== mddev
->pers
) {
3351 /* Nothing to do! */
3352 module_put(pers
->owner
);
3356 if (!pers
->takeover
) {
3357 module_put(pers
->owner
);
3358 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3359 mdname(mddev
), clevel
);
3364 rdev_for_each(rdev
, mddev
)
3365 rdev
->new_raid_disk
= rdev
->raid_disk
;
3367 /* ->takeover must set new_* and/or delta_disks
3368 * if it succeeds, and may set them when it fails.
3370 priv
= pers
->takeover(mddev
);
3372 mddev
->new_level
= mddev
->level
;
3373 mddev
->new_layout
= mddev
->layout
;
3374 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3375 mddev
->raid_disks
-= mddev
->delta_disks
;
3376 mddev
->delta_disks
= 0;
3377 mddev
->reshape_backwards
= 0;
3378 module_put(pers
->owner
);
3379 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3380 mdname(mddev
), clevel
);
3385 /* Looks like we have a winner */
3386 mddev_suspend(mddev
);
3387 mddev_detach(mddev
);
3389 spin_lock(&mddev
->lock
);
3390 oldpers
= mddev
->pers
;
3391 oldpriv
= mddev
->private;
3393 mddev
->private = priv
;
3394 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3395 mddev
->level
= mddev
->new_level
;
3396 mddev
->layout
= mddev
->new_layout
;
3397 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3398 mddev
->delta_disks
= 0;
3399 mddev
->reshape_backwards
= 0;
3400 mddev
->degraded
= 0;
3401 spin_unlock(&mddev
->lock
);
3403 if (oldpers
->sync_request
== NULL
&&
3405 /* We are converting from a no-redundancy array
3406 * to a redundancy array and metadata is managed
3407 * externally so we need to be sure that writes
3408 * won't block due to a need to transition
3410 * until external management is started.
3413 mddev
->safemode_delay
= 0;
3414 mddev
->safemode
= 0;
3417 oldpers
->free(mddev
, oldpriv
);
3419 if (oldpers
->sync_request
== NULL
&&
3420 pers
->sync_request
!= NULL
) {
3421 /* need to add the md_redundancy_group */
3422 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3424 "md: cannot register extra attributes for %s\n",
3426 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3428 if (oldpers
->sync_request
!= NULL
&&
3429 pers
->sync_request
== NULL
) {
3430 /* need to remove the md_redundancy_group */
3431 if (mddev
->to_remove
== NULL
)
3432 mddev
->to_remove
= &md_redundancy_group
;
3435 rdev_for_each(rdev
, mddev
) {
3436 if (rdev
->raid_disk
< 0)
3438 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3439 rdev
->new_raid_disk
= -1;
3440 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3442 sysfs_unlink_rdev(mddev
, rdev
);
3444 rdev_for_each(rdev
, mddev
) {
3445 if (rdev
->raid_disk
< 0)
3447 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3449 rdev
->raid_disk
= rdev
->new_raid_disk
;
3450 if (rdev
->raid_disk
< 0)
3451 clear_bit(In_sync
, &rdev
->flags
);
3453 if (sysfs_link_rdev(mddev
, rdev
))
3454 printk(KERN_WARNING
"md: cannot register rd%d"
3455 " for %s after level change\n",
3456 rdev
->raid_disk
, mdname(mddev
));
3460 if (pers
->sync_request
== NULL
) {
3461 /* this is now an array without redundancy, so
3462 * it must always be in_sync
3465 del_timer_sync(&mddev
->safemode_timer
);
3467 blk_set_stacking_limits(&mddev
->queue
->limits
);
3469 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3470 mddev_resume(mddev
);
3472 md_update_sb(mddev
, 1);
3473 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3474 md_new_event(mddev
);
3477 mddev_unlock(mddev
);
3481 static struct md_sysfs_entry md_level
=
3482 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3485 layout_show(struct mddev
*mddev
, char *page
)
3487 /* just a number, not meaningful for all levels */
3488 if (mddev
->reshape_position
!= MaxSector
&&
3489 mddev
->layout
!= mddev
->new_layout
)
3490 return sprintf(page
, "%d (%d)\n",
3491 mddev
->new_layout
, mddev
->layout
);
3492 return sprintf(page
, "%d\n", mddev
->layout
);
3496 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3499 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3502 if (!*buf
|| (*e
&& *e
!= '\n'))
3504 err
= mddev_lock(mddev
);
3509 if (mddev
->pers
->check_reshape
== NULL
)
3514 mddev
->new_layout
= n
;
3515 err
= mddev
->pers
->check_reshape(mddev
);
3517 mddev
->new_layout
= mddev
->layout
;
3520 mddev
->new_layout
= n
;
3521 if (mddev
->reshape_position
== MaxSector
)
3524 mddev_unlock(mddev
);
3527 static struct md_sysfs_entry md_layout
=
3528 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3531 raid_disks_show(struct mddev
*mddev
, char *page
)
3533 if (mddev
->raid_disks
== 0)
3535 if (mddev
->reshape_position
!= MaxSector
&&
3536 mddev
->delta_disks
!= 0)
3537 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3538 mddev
->raid_disks
- mddev
->delta_disks
);
3539 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3542 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3545 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3549 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3551 if (!*buf
|| (*e
&& *e
!= '\n'))
3554 err
= mddev_lock(mddev
);
3558 err
= update_raid_disks(mddev
, n
);
3559 else if (mddev
->reshape_position
!= MaxSector
) {
3560 struct md_rdev
*rdev
;
3561 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3564 rdev_for_each(rdev
, mddev
) {
3566 rdev
->data_offset
< rdev
->new_data_offset
)
3569 rdev
->data_offset
> rdev
->new_data_offset
)
3573 mddev
->delta_disks
= n
- olddisks
;
3574 mddev
->raid_disks
= n
;
3575 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3577 mddev
->raid_disks
= n
;
3579 mddev_unlock(mddev
);
3580 return err
? err
: len
;
3582 static struct md_sysfs_entry md_raid_disks
=
3583 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3586 chunk_size_show(struct mddev
*mddev
, char *page
)
3588 if (mddev
->reshape_position
!= MaxSector
&&
3589 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3590 return sprintf(page
, "%d (%d)\n",
3591 mddev
->new_chunk_sectors
<< 9,
3592 mddev
->chunk_sectors
<< 9);
3593 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3597 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3601 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3603 if (!*buf
|| (*e
&& *e
!= '\n'))
3606 err
= mddev_lock(mddev
);
3610 if (mddev
->pers
->check_reshape
== NULL
)
3615 mddev
->new_chunk_sectors
= n
>> 9;
3616 err
= mddev
->pers
->check_reshape(mddev
);
3618 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3621 mddev
->new_chunk_sectors
= n
>> 9;
3622 if (mddev
->reshape_position
== MaxSector
)
3623 mddev
->chunk_sectors
= n
>> 9;
3625 mddev_unlock(mddev
);
3628 static struct md_sysfs_entry md_chunk_size
=
3629 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3632 resync_start_show(struct mddev
*mddev
, char *page
)
3634 if (mddev
->recovery_cp
== MaxSector
)
3635 return sprintf(page
, "none\n");
3636 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3640 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3644 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3646 err
= mddev_lock(mddev
);
3649 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3651 else if (cmd_match(buf
, "none"))
3653 else if (!*buf
|| (*e
&& *e
!= '\n'))
3657 mddev
->recovery_cp
= n
;
3659 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3661 mddev_unlock(mddev
);
3664 static struct md_sysfs_entry md_resync_start
=
3665 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3668 * The array state can be:
3671 * No devices, no size, no level
3672 * Equivalent to STOP_ARRAY ioctl
3674 * May have some settings, but array is not active
3675 * all IO results in error
3676 * When written, doesn't tear down array, but just stops it
3677 * suspended (not supported yet)
3678 * All IO requests will block. The array can be reconfigured.
3679 * Writing this, if accepted, will block until array is quiescent
3681 * no resync can happen. no superblocks get written.
3682 * write requests fail
3684 * like readonly, but behaves like 'clean' on a write request.
3686 * clean - no pending writes, but otherwise active.
3687 * When written to inactive array, starts without resync
3688 * If a write request arrives then
3689 * if metadata is known, mark 'dirty' and switch to 'active'.
3690 * if not known, block and switch to write-pending
3691 * If written to an active array that has pending writes, then fails.
3693 * fully active: IO and resync can be happening.
3694 * When written to inactive array, starts with resync
3697 * clean, but writes are blocked waiting for 'active' to be written.
3700 * like active, but no writes have been seen for a while (100msec).
3703 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3704 write_pending
, active_idle
, bad_word
};
3705 static char *array_states
[] = {
3706 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3707 "write-pending", "active-idle", NULL
};
3709 static int match_word(const char *word
, char **list
)
3712 for (n
=0; list
[n
]; n
++)
3713 if (cmd_match(word
, list
[n
]))
3719 array_state_show(struct mddev
*mddev
, char *page
)
3721 enum array_state st
= inactive
;
3734 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3736 else if (mddev
->safemode
)
3742 if (list_empty(&mddev
->disks
) &&
3743 mddev
->raid_disks
== 0 &&
3744 mddev
->dev_sectors
== 0)
3749 return sprintf(page
, "%s\n", array_states
[st
]);
3752 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3753 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3754 static int do_md_run(struct mddev
*mddev
);
3755 static int restart_array(struct mddev
*mddev
);
3758 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3761 enum array_state st
= match_word(buf
, array_states
);
3763 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3764 /* don't take reconfig_mutex when toggling between
3767 spin_lock(&mddev
->lock
);
3769 restart_array(mddev
);
3770 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3771 wake_up(&mddev
->sb_wait
);
3773 } else /* st == clean */ {
3774 restart_array(mddev
);
3775 if (atomic_read(&mddev
->writes_pending
) == 0) {
3776 if (mddev
->in_sync
== 0) {
3778 if (mddev
->safemode
== 1)
3779 mddev
->safemode
= 0;
3780 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3786 spin_unlock(&mddev
->lock
);
3789 err
= mddev_lock(mddev
);
3797 /* stopping an active array */
3798 err
= do_md_stop(mddev
, 0, NULL
);
3801 /* stopping an active array */
3803 err
= do_md_stop(mddev
, 2, NULL
);
3805 err
= 0; /* already inactive */
3808 break; /* not supported yet */
3811 err
= md_set_readonly(mddev
, NULL
);
3814 set_disk_ro(mddev
->gendisk
, 1);
3815 err
= do_md_run(mddev
);
3821 err
= md_set_readonly(mddev
, NULL
);
3822 else if (mddev
->ro
== 1)
3823 err
= restart_array(mddev
);
3826 set_disk_ro(mddev
->gendisk
, 0);
3830 err
= do_md_run(mddev
);
3835 restart_array(mddev
);
3836 spin_lock(&mddev
->lock
);
3837 if (atomic_read(&mddev
->writes_pending
) == 0) {
3838 if (mddev
->in_sync
== 0) {
3840 if (mddev
->safemode
== 1)
3841 mddev
->safemode
= 0;
3842 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3847 spin_unlock(&mddev
->lock
);
3853 restart_array(mddev
);
3854 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3855 wake_up(&mddev
->sb_wait
);
3859 set_disk_ro(mddev
->gendisk
, 0);
3860 err
= do_md_run(mddev
);
3865 /* these cannot be set */
3870 if (mddev
->hold_active
== UNTIL_IOCTL
)
3871 mddev
->hold_active
= 0;
3872 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3874 mddev_unlock(mddev
);
3877 static struct md_sysfs_entry md_array_state
=
3878 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3881 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3882 return sprintf(page
, "%d\n",
3883 atomic_read(&mddev
->max_corr_read_errors
));
3887 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3890 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3892 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3893 atomic_set(&mddev
->max_corr_read_errors
, n
);
3899 static struct md_sysfs_entry max_corr_read_errors
=
3900 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3901 max_corrected_read_errors_store
);
3904 null_show(struct mddev
*mddev
, char *page
)
3910 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3912 /* buf must be %d:%d\n? giving major and minor numbers */
3913 /* The new device is added to the array.
3914 * If the array has a persistent superblock, we read the
3915 * superblock to initialise info and check validity.
3916 * Otherwise, only checking done is that in bind_rdev_to_array,
3917 * which mainly checks size.
3920 int major
= simple_strtoul(buf
, &e
, 10);
3923 struct md_rdev
*rdev
;
3926 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3928 minor
= simple_strtoul(e
+1, &e
, 10);
3929 if (*e
&& *e
!= '\n')
3931 dev
= MKDEV(major
, minor
);
3932 if (major
!= MAJOR(dev
) ||
3933 minor
!= MINOR(dev
))
3936 flush_workqueue(md_misc_wq
);
3938 err
= mddev_lock(mddev
);
3941 if (mddev
->persistent
) {
3942 rdev
= md_import_device(dev
, mddev
->major_version
,
3943 mddev
->minor_version
);
3944 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3945 struct md_rdev
*rdev0
3946 = list_entry(mddev
->disks
.next
,
3947 struct md_rdev
, same_set
);
3948 err
= super_types
[mddev
->major_version
]
3949 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3953 } else if (mddev
->external
)
3954 rdev
= md_import_device(dev
, -2, -1);
3956 rdev
= md_import_device(dev
, -1, -1);
3959 return PTR_ERR(rdev
);
3960 err
= bind_rdev_to_array(rdev
, mddev
);
3964 mddev_unlock(mddev
);
3965 return err
? err
: len
;
3968 static struct md_sysfs_entry md_new_device
=
3969 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3972 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3975 unsigned long chunk
, end_chunk
;
3978 err
= mddev_lock(mddev
);
3983 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3985 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3986 if (buf
== end
) break;
3987 if (*end
== '-') { /* range */
3989 end_chunk
= simple_strtoul(buf
, &end
, 0);
3990 if (buf
== end
) break;
3992 if (*end
&& !isspace(*end
)) break;
3993 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3994 buf
= skip_spaces(end
);
3996 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3998 mddev_unlock(mddev
);
4002 static struct md_sysfs_entry md_bitmap
=
4003 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4006 size_show(struct mddev
*mddev
, char *page
)
4008 return sprintf(page
, "%llu\n",
4009 (unsigned long long)mddev
->dev_sectors
/ 2);
4012 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4015 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4017 /* If array is inactive, we can reduce the component size, but
4018 * not increase it (except from 0).
4019 * If array is active, we can try an on-line resize
4022 int err
= strict_blocks_to_sectors(buf
, §ors
);
4026 err
= mddev_lock(mddev
);
4030 if (mddev_is_clustered(mddev
))
4031 md_cluster_ops
->metadata_update_start(mddev
);
4032 err
= update_size(mddev
, sectors
);
4033 md_update_sb(mddev
, 1);
4034 if (mddev_is_clustered(mddev
))
4035 md_cluster_ops
->metadata_update_finish(mddev
);
4037 if (mddev
->dev_sectors
== 0 ||
4038 mddev
->dev_sectors
> sectors
)
4039 mddev
->dev_sectors
= sectors
;
4043 mddev_unlock(mddev
);
4044 return err
? err
: len
;
4047 static struct md_sysfs_entry md_size
=
4048 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4050 /* Metadata version.
4052 * 'none' for arrays with no metadata (good luck...)
4053 * 'external' for arrays with externally managed metadata,
4054 * or N.M for internally known formats
4057 metadata_show(struct mddev
*mddev
, char *page
)
4059 if (mddev
->persistent
)
4060 return sprintf(page
, "%d.%d\n",
4061 mddev
->major_version
, mddev
->minor_version
);
4062 else if (mddev
->external
)
4063 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4065 return sprintf(page
, "none\n");
4069 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4074 /* Changing the details of 'external' metadata is
4075 * always permitted. Otherwise there must be
4076 * no devices attached to the array.
4079 err
= mddev_lock(mddev
);
4083 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4085 else if (!list_empty(&mddev
->disks
))
4089 if (cmd_match(buf
, "none")) {
4090 mddev
->persistent
= 0;
4091 mddev
->external
= 0;
4092 mddev
->major_version
= 0;
4093 mddev
->minor_version
= 90;
4096 if (strncmp(buf
, "external:", 9) == 0) {
4097 size_t namelen
= len
-9;
4098 if (namelen
>= sizeof(mddev
->metadata_type
))
4099 namelen
= sizeof(mddev
->metadata_type
)-1;
4100 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4101 mddev
->metadata_type
[namelen
] = 0;
4102 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4103 mddev
->metadata_type
[--namelen
] = 0;
4104 mddev
->persistent
= 0;
4105 mddev
->external
= 1;
4106 mddev
->major_version
= 0;
4107 mddev
->minor_version
= 90;
4110 major
= simple_strtoul(buf
, &e
, 10);
4112 if (e
==buf
|| *e
!= '.')
4115 minor
= simple_strtoul(buf
, &e
, 10);
4116 if (e
==buf
|| (*e
&& *e
!= '\n') )
4119 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4121 mddev
->major_version
= major
;
4122 mddev
->minor_version
= minor
;
4123 mddev
->persistent
= 1;
4124 mddev
->external
= 0;
4127 mddev_unlock(mddev
);
4131 static struct md_sysfs_entry md_metadata
=
4132 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4135 action_show(struct mddev
*mddev
, char *page
)
4137 char *type
= "idle";
4138 unsigned long recovery
= mddev
->recovery
;
4139 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4141 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4142 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4143 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4145 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4146 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4148 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4152 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4155 return sprintf(page
, "%s\n", type
);
4159 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4161 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4164 if (cmd_match(page
, "frozen"))
4165 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4167 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4169 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4170 flush_workqueue(md_misc_wq
);
4171 if (mddev
->sync_thread
) {
4172 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4173 if (mddev_lock(mddev
) == 0) {
4174 md_reap_sync_thread(mddev
);
4175 mddev_unlock(mddev
);
4178 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4179 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4181 else if (cmd_match(page
, "resync"))
4182 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4183 else if (cmd_match(page
, "recover")) {
4184 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4185 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4186 } else if (cmd_match(page
, "reshape")) {
4188 if (mddev
->pers
->start_reshape
== NULL
)
4190 err
= mddev_lock(mddev
);
4192 err
= mddev
->pers
->start_reshape(mddev
);
4193 mddev_unlock(mddev
);
4197 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4199 if (cmd_match(page
, "check"))
4200 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4201 else if (!cmd_match(page
, "repair"))
4203 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4204 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4206 if (mddev
->ro
== 2) {
4207 /* A write to sync_action is enough to justify
4208 * canceling read-auto mode
4211 md_wakeup_thread(mddev
->sync_thread
);
4213 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4214 md_wakeup_thread(mddev
->thread
);
4215 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4219 static struct md_sysfs_entry md_scan_mode
=
4220 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4223 last_sync_action_show(struct mddev
*mddev
, char *page
)
4225 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4228 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4231 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4233 return sprintf(page
, "%llu\n",
4234 (unsigned long long)
4235 atomic64_read(&mddev
->resync_mismatches
));
4238 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4241 sync_min_show(struct mddev
*mddev
, char *page
)
4243 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4244 mddev
->sync_speed_min
? "local": "system");
4248 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4252 if (strncmp(buf
, "system", 6)==0) {
4253 mddev
->sync_speed_min
= 0;
4256 min
= simple_strtoul(buf
, &e
, 10);
4257 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4259 mddev
->sync_speed_min
= min
;
4263 static struct md_sysfs_entry md_sync_min
=
4264 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4267 sync_max_show(struct mddev
*mddev
, char *page
)
4269 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4270 mddev
->sync_speed_max
? "local": "system");
4274 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4278 if (strncmp(buf
, "system", 6)==0) {
4279 mddev
->sync_speed_max
= 0;
4282 max
= simple_strtoul(buf
, &e
, 10);
4283 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4285 mddev
->sync_speed_max
= max
;
4289 static struct md_sysfs_entry md_sync_max
=
4290 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4293 degraded_show(struct mddev
*mddev
, char *page
)
4295 return sprintf(page
, "%d\n", mddev
->degraded
);
4297 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4300 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4302 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4306 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4310 if (kstrtol(buf
, 10, &n
))
4313 if (n
!= 0 && n
!= 1)
4316 mddev
->parallel_resync
= n
;
4318 if (mddev
->sync_thread
)
4319 wake_up(&resync_wait
);
4324 /* force parallel resync, even with shared block devices */
4325 static struct md_sysfs_entry md_sync_force_parallel
=
4326 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4327 sync_force_parallel_show
, sync_force_parallel_store
);
4330 sync_speed_show(struct mddev
*mddev
, char *page
)
4332 unsigned long resync
, dt
, db
;
4333 if (mddev
->curr_resync
== 0)
4334 return sprintf(page
, "none\n");
4335 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4336 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4338 db
= resync
- mddev
->resync_mark_cnt
;
4339 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4342 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4345 sync_completed_show(struct mddev
*mddev
, char *page
)
4347 unsigned long long max_sectors
, resync
;
4349 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4350 return sprintf(page
, "none\n");
4352 if (mddev
->curr_resync
== 1 ||
4353 mddev
->curr_resync
== 2)
4354 return sprintf(page
, "delayed\n");
4356 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4357 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4358 max_sectors
= mddev
->resync_max_sectors
;
4360 max_sectors
= mddev
->dev_sectors
;
4362 resync
= mddev
->curr_resync_completed
;
4363 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4366 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4369 min_sync_show(struct mddev
*mddev
, char *page
)
4371 return sprintf(page
, "%llu\n",
4372 (unsigned long long)mddev
->resync_min
);
4375 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4377 unsigned long long min
;
4381 if (kstrtoull(buf
, 10, &min
))
4384 spin_lock(&mddev
->lock
);
4386 if (min
> mddev
->resync_max
)
4390 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4393 /* Must be a multiple of chunk_size */
4394 chunk
= mddev
->chunk_sectors
;
4396 sector_t temp
= min
;
4399 if (sector_div(temp
, chunk
))
4402 mddev
->resync_min
= min
;
4406 spin_unlock(&mddev
->lock
);
4410 static struct md_sysfs_entry md_min_sync
=
4411 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4414 max_sync_show(struct mddev
*mddev
, char *page
)
4416 if (mddev
->resync_max
== MaxSector
)
4417 return sprintf(page
, "max\n");
4419 return sprintf(page
, "%llu\n",
4420 (unsigned long long)mddev
->resync_max
);
4423 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4426 spin_lock(&mddev
->lock
);
4427 if (strncmp(buf
, "max", 3) == 0)
4428 mddev
->resync_max
= MaxSector
;
4430 unsigned long long max
;
4434 if (kstrtoull(buf
, 10, &max
))
4436 if (max
< mddev
->resync_min
)
4440 if (max
< mddev
->resync_max
&&
4442 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4445 /* Must be a multiple of chunk_size */
4446 chunk
= mddev
->chunk_sectors
;
4448 sector_t temp
= max
;
4451 if (sector_div(temp
, chunk
))
4454 mddev
->resync_max
= max
;
4456 wake_up(&mddev
->recovery_wait
);
4459 spin_unlock(&mddev
->lock
);
4463 static struct md_sysfs_entry md_max_sync
=
4464 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4467 suspend_lo_show(struct mddev
*mddev
, char *page
)
4469 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4473 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4476 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4477 unsigned long long old
;
4480 if (buf
== e
|| (*e
&& *e
!= '\n'))
4483 err
= mddev_lock(mddev
);
4487 if (mddev
->pers
== NULL
||
4488 mddev
->pers
->quiesce
== NULL
)
4490 old
= mddev
->suspend_lo
;
4491 mddev
->suspend_lo
= new;
4493 /* Shrinking suspended region */
4494 mddev
->pers
->quiesce(mddev
, 2);
4496 /* Expanding suspended region - need to wait */
4497 mddev
->pers
->quiesce(mddev
, 1);
4498 mddev
->pers
->quiesce(mddev
, 0);
4502 mddev_unlock(mddev
);
4505 static struct md_sysfs_entry md_suspend_lo
=
4506 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4509 suspend_hi_show(struct mddev
*mddev
, char *page
)
4511 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4515 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4518 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4519 unsigned long long old
;
4522 if (buf
== e
|| (*e
&& *e
!= '\n'))
4525 err
= mddev_lock(mddev
);
4529 if (mddev
->pers
== NULL
||
4530 mddev
->pers
->quiesce
== NULL
)
4532 old
= mddev
->suspend_hi
;
4533 mddev
->suspend_hi
= new;
4535 /* Shrinking suspended region */
4536 mddev
->pers
->quiesce(mddev
, 2);
4538 /* Expanding suspended region - need to wait */
4539 mddev
->pers
->quiesce(mddev
, 1);
4540 mddev
->pers
->quiesce(mddev
, 0);
4544 mddev_unlock(mddev
);
4547 static struct md_sysfs_entry md_suspend_hi
=
4548 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4551 reshape_position_show(struct mddev
*mddev
, char *page
)
4553 if (mddev
->reshape_position
!= MaxSector
)
4554 return sprintf(page
, "%llu\n",
4555 (unsigned long long)mddev
->reshape_position
);
4556 strcpy(page
, "none\n");
4561 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4563 struct md_rdev
*rdev
;
4566 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4568 if (buf
== e
|| (*e
&& *e
!= '\n'))
4570 err
= mddev_lock(mddev
);
4576 mddev
->reshape_position
= new;
4577 mddev
->delta_disks
= 0;
4578 mddev
->reshape_backwards
= 0;
4579 mddev
->new_level
= mddev
->level
;
4580 mddev
->new_layout
= mddev
->layout
;
4581 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4582 rdev_for_each(rdev
, mddev
)
4583 rdev
->new_data_offset
= rdev
->data_offset
;
4586 mddev_unlock(mddev
);
4590 static struct md_sysfs_entry md_reshape_position
=
4591 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4592 reshape_position_store
);
4595 reshape_direction_show(struct mddev
*mddev
, char *page
)
4597 return sprintf(page
, "%s\n",
4598 mddev
->reshape_backwards
? "backwards" : "forwards");
4602 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4607 if (cmd_match(buf
, "forwards"))
4609 else if (cmd_match(buf
, "backwards"))
4613 if (mddev
->reshape_backwards
== backwards
)
4616 err
= mddev_lock(mddev
);
4619 /* check if we are allowed to change */
4620 if (mddev
->delta_disks
)
4622 else if (mddev
->persistent
&&
4623 mddev
->major_version
== 0)
4626 mddev
->reshape_backwards
= backwards
;
4627 mddev_unlock(mddev
);
4631 static struct md_sysfs_entry md_reshape_direction
=
4632 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4633 reshape_direction_store
);
4636 array_size_show(struct mddev
*mddev
, char *page
)
4638 if (mddev
->external_size
)
4639 return sprintf(page
, "%llu\n",
4640 (unsigned long long)mddev
->array_sectors
/2);
4642 return sprintf(page
, "default\n");
4646 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4651 err
= mddev_lock(mddev
);
4655 if (strncmp(buf
, "default", 7) == 0) {
4657 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4659 sectors
= mddev
->array_sectors
;
4661 mddev
->external_size
= 0;
4663 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4665 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4668 mddev
->external_size
= 1;
4672 mddev
->array_sectors
= sectors
;
4674 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4675 revalidate_disk(mddev
->gendisk
);
4678 mddev_unlock(mddev
);
4682 static struct md_sysfs_entry md_array_size
=
4683 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4686 static struct attribute
*md_default_attrs
[] = {
4689 &md_raid_disks
.attr
,
4690 &md_chunk_size
.attr
,
4692 &md_resync_start
.attr
,
4694 &md_new_device
.attr
,
4695 &md_safe_delay
.attr
,
4696 &md_array_state
.attr
,
4697 &md_reshape_position
.attr
,
4698 &md_reshape_direction
.attr
,
4699 &md_array_size
.attr
,
4700 &max_corr_read_errors
.attr
,
4704 static struct attribute
*md_redundancy_attrs
[] = {
4706 &md_last_scan_mode
.attr
,
4707 &md_mismatches
.attr
,
4710 &md_sync_speed
.attr
,
4711 &md_sync_force_parallel
.attr
,
4712 &md_sync_completed
.attr
,
4715 &md_suspend_lo
.attr
,
4716 &md_suspend_hi
.attr
,
4721 static struct attribute_group md_redundancy_group
= {
4723 .attrs
= md_redundancy_attrs
,
4727 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4729 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4730 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4735 spin_lock(&all_mddevs_lock
);
4736 if (list_empty(&mddev
->all_mddevs
)) {
4737 spin_unlock(&all_mddevs_lock
);
4741 spin_unlock(&all_mddevs_lock
);
4743 rv
= entry
->show(mddev
, page
);
4749 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4750 const char *page
, size_t length
)
4752 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4753 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4758 if (!capable(CAP_SYS_ADMIN
))
4760 spin_lock(&all_mddevs_lock
);
4761 if (list_empty(&mddev
->all_mddevs
)) {
4762 spin_unlock(&all_mddevs_lock
);
4766 spin_unlock(&all_mddevs_lock
);
4767 rv
= entry
->store(mddev
, page
, length
);
4772 static void md_free(struct kobject
*ko
)
4774 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4776 if (mddev
->sysfs_state
)
4777 sysfs_put(mddev
->sysfs_state
);
4779 if (mddev
->gendisk
) {
4780 del_gendisk(mddev
->gendisk
);
4781 put_disk(mddev
->gendisk
);
4784 blk_cleanup_queue(mddev
->queue
);
4789 static const struct sysfs_ops md_sysfs_ops
= {
4790 .show
= md_attr_show
,
4791 .store
= md_attr_store
,
4793 static struct kobj_type md_ktype
= {
4795 .sysfs_ops
= &md_sysfs_ops
,
4796 .default_attrs
= md_default_attrs
,
4801 static void mddev_delayed_delete(struct work_struct
*ws
)
4803 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4805 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4806 kobject_del(&mddev
->kobj
);
4807 kobject_put(&mddev
->kobj
);
4810 static int md_alloc(dev_t dev
, char *name
)
4812 static DEFINE_MUTEX(disks_mutex
);
4813 struct mddev
*mddev
= mddev_find(dev
);
4814 struct gendisk
*disk
;
4823 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4824 shift
= partitioned
? MdpMinorShift
: 0;
4825 unit
= MINOR(mddev
->unit
) >> shift
;
4827 /* wait for any previous instance of this device to be
4828 * completely removed (mddev_delayed_delete).
4830 flush_workqueue(md_misc_wq
);
4832 mutex_lock(&disks_mutex
);
4838 /* Need to ensure that 'name' is not a duplicate.
4840 struct mddev
*mddev2
;
4841 spin_lock(&all_mddevs_lock
);
4843 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4844 if (mddev2
->gendisk
&&
4845 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4846 spin_unlock(&all_mddevs_lock
);
4849 spin_unlock(&all_mddevs_lock
);
4853 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4856 mddev
->queue
->queuedata
= mddev
;
4858 blk_queue_make_request(mddev
->queue
, md_make_request
);
4859 blk_set_stacking_limits(&mddev
->queue
->limits
);
4861 disk
= alloc_disk(1 << shift
);
4863 blk_cleanup_queue(mddev
->queue
);
4864 mddev
->queue
= NULL
;
4867 disk
->major
= MAJOR(mddev
->unit
);
4868 disk
->first_minor
= unit
<< shift
;
4870 strcpy(disk
->disk_name
, name
);
4871 else if (partitioned
)
4872 sprintf(disk
->disk_name
, "md_d%d", unit
);
4874 sprintf(disk
->disk_name
, "md%d", unit
);
4875 disk
->fops
= &md_fops
;
4876 disk
->private_data
= mddev
;
4877 disk
->queue
= mddev
->queue
;
4878 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4879 /* Allow extended partitions. This makes the
4880 * 'mdp' device redundant, but we can't really
4883 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4884 mddev
->gendisk
= disk
;
4885 /* As soon as we call add_disk(), another thread could get
4886 * through to md_open, so make sure it doesn't get too far
4888 mutex_lock(&mddev
->open_mutex
);
4891 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4892 &disk_to_dev(disk
)->kobj
, "%s", "md");
4894 /* This isn't possible, but as kobject_init_and_add is marked
4895 * __must_check, we must do something with the result
4897 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4901 if (mddev
->kobj
.sd
&&
4902 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4903 printk(KERN_DEBUG
"pointless warning\n");
4904 mutex_unlock(&mddev
->open_mutex
);
4906 mutex_unlock(&disks_mutex
);
4907 if (!error
&& mddev
->kobj
.sd
) {
4908 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4909 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4915 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4917 md_alloc(dev
, NULL
);
4921 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4923 /* val must be "md_*" where * is not all digits.
4924 * We allocate an array with a large free minor number, and
4925 * set the name to val. val must not already be an active name.
4927 int len
= strlen(val
);
4928 char buf
[DISK_NAME_LEN
];
4930 while (len
&& val
[len
-1] == '\n')
4932 if (len
>= DISK_NAME_LEN
)
4934 strlcpy(buf
, val
, len
+1);
4935 if (strncmp(buf
, "md_", 3) != 0)
4937 return md_alloc(0, buf
);
4940 static void md_safemode_timeout(unsigned long data
)
4942 struct mddev
*mddev
= (struct mddev
*) data
;
4944 if (!atomic_read(&mddev
->writes_pending
)) {
4945 mddev
->safemode
= 1;
4946 if (mddev
->external
)
4947 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4949 md_wakeup_thread(mddev
->thread
);
4952 static int start_dirty_degraded
;
4954 int md_run(struct mddev
*mddev
)
4957 struct md_rdev
*rdev
;
4958 struct md_personality
*pers
;
4960 if (list_empty(&mddev
->disks
))
4961 /* cannot run an array with no devices.. */
4966 /* Cannot run until previous stop completes properly */
4967 if (mddev
->sysfs_active
)
4971 * Analyze all RAID superblock(s)
4973 if (!mddev
->raid_disks
) {
4974 if (!mddev
->persistent
)
4979 if (mddev
->level
!= LEVEL_NONE
)
4980 request_module("md-level-%d", mddev
->level
);
4981 else if (mddev
->clevel
[0])
4982 request_module("md-%s", mddev
->clevel
);
4985 * Drop all container device buffers, from now on
4986 * the only valid external interface is through the md
4989 rdev_for_each(rdev
, mddev
) {
4990 if (test_bit(Faulty
, &rdev
->flags
))
4992 sync_blockdev(rdev
->bdev
);
4993 invalidate_bdev(rdev
->bdev
);
4995 /* perform some consistency tests on the device.
4996 * We don't want the data to overlap the metadata,
4997 * Internal Bitmap issues have been handled elsewhere.
4999 if (rdev
->meta_bdev
) {
5000 /* Nothing to check */;
5001 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5002 if (mddev
->dev_sectors
&&
5003 rdev
->data_offset
+ mddev
->dev_sectors
5005 printk("md: %s: data overlaps metadata\n",
5010 if (rdev
->sb_start
+ rdev
->sb_size
/512
5011 > rdev
->data_offset
) {
5012 printk("md: %s: metadata overlaps data\n",
5017 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5020 if (mddev
->bio_set
== NULL
)
5021 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5023 spin_lock(&pers_lock
);
5024 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5025 if (!pers
|| !try_module_get(pers
->owner
)) {
5026 spin_unlock(&pers_lock
);
5027 if (mddev
->level
!= LEVEL_NONE
)
5028 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5031 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5035 spin_unlock(&pers_lock
);
5036 if (mddev
->level
!= pers
->level
) {
5037 mddev
->level
= pers
->level
;
5038 mddev
->new_level
= pers
->level
;
5040 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5042 if (mddev
->reshape_position
!= MaxSector
&&
5043 pers
->start_reshape
== NULL
) {
5044 /* This personality cannot handle reshaping... */
5045 module_put(pers
->owner
);
5049 if (pers
->sync_request
) {
5050 /* Warn if this is a potentially silly
5053 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5054 struct md_rdev
*rdev2
;
5057 rdev_for_each(rdev
, mddev
)
5058 rdev_for_each(rdev2
, mddev
) {
5060 rdev
->bdev
->bd_contains
==
5061 rdev2
->bdev
->bd_contains
) {
5063 "%s: WARNING: %s appears to be"
5064 " on the same physical disk as"
5067 bdevname(rdev
->bdev
,b
),
5068 bdevname(rdev2
->bdev
,b2
));
5075 "True protection against single-disk"
5076 " failure might be compromised.\n");
5079 mddev
->recovery
= 0;
5080 /* may be over-ridden by personality */
5081 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5083 mddev
->ok_start_degraded
= start_dirty_degraded
;
5085 if (start_readonly
&& mddev
->ro
== 0)
5086 mddev
->ro
= 2; /* read-only, but switch on first write */
5088 err
= pers
->run(mddev
);
5090 printk(KERN_ERR
"md: pers->run() failed ...\n");
5091 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5092 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5093 " but 'external_size' not in effect?\n", __func__
);
5095 "md: invalid array_size %llu > default size %llu\n",
5096 (unsigned long long)mddev
->array_sectors
/ 2,
5097 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5100 if (err
== 0 && pers
->sync_request
&&
5101 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5102 struct bitmap
*bitmap
;
5104 bitmap
= bitmap_create(mddev
, -1);
5105 if (IS_ERR(bitmap
)) {
5106 err
= PTR_ERR(bitmap
);
5107 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5108 mdname(mddev
), err
);
5110 mddev
->bitmap
= bitmap
;
5114 mddev_detach(mddev
);
5115 pers
->free(mddev
, mddev
->private);
5116 module_put(pers
->owner
);
5117 bitmap_destroy(mddev
);
5121 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5122 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5123 blk_queue_merge_bvec(mddev
->queue
, md_mergeable_bvec
);
5125 if (pers
->sync_request
) {
5126 if (mddev
->kobj
.sd
&&
5127 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5129 "md: cannot register extra attributes for %s\n",
5131 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5132 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5135 atomic_set(&mddev
->writes_pending
,0);
5136 atomic_set(&mddev
->max_corr_read_errors
,
5137 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5138 mddev
->safemode
= 0;
5139 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5140 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5141 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5144 spin_lock(&mddev
->lock
);
5147 spin_unlock(&mddev
->lock
);
5148 rdev_for_each(rdev
, mddev
)
5149 if (rdev
->raid_disk
>= 0)
5150 if (sysfs_link_rdev(mddev
, rdev
))
5151 /* failure here is OK */;
5153 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5155 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5156 md_update_sb(mddev
, 0);
5158 md_new_event(mddev
);
5159 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5160 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5161 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5164 EXPORT_SYMBOL_GPL(md_run
);
5166 static int do_md_run(struct mddev
*mddev
)
5170 err
= md_run(mddev
);
5173 err
= bitmap_load(mddev
);
5175 bitmap_destroy(mddev
);
5179 md_wakeup_thread(mddev
->thread
);
5180 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5182 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5183 revalidate_disk(mddev
->gendisk
);
5185 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5190 static int restart_array(struct mddev
*mddev
)
5192 struct gendisk
*disk
= mddev
->gendisk
;
5194 /* Complain if it has no devices */
5195 if (list_empty(&mddev
->disks
))
5201 mddev
->safemode
= 0;
5203 set_disk_ro(disk
, 0);
5204 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5206 /* Kick recovery or resync if necessary */
5207 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5208 md_wakeup_thread(mddev
->thread
);
5209 md_wakeup_thread(mddev
->sync_thread
);
5210 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5214 static void md_clean(struct mddev
*mddev
)
5216 mddev
->array_sectors
= 0;
5217 mddev
->external_size
= 0;
5218 mddev
->dev_sectors
= 0;
5219 mddev
->raid_disks
= 0;
5220 mddev
->recovery_cp
= 0;
5221 mddev
->resync_min
= 0;
5222 mddev
->resync_max
= MaxSector
;
5223 mddev
->reshape_position
= MaxSector
;
5224 mddev
->external
= 0;
5225 mddev
->persistent
= 0;
5226 mddev
->level
= LEVEL_NONE
;
5227 mddev
->clevel
[0] = 0;
5230 mddev
->metadata_type
[0] = 0;
5231 mddev
->chunk_sectors
= 0;
5232 mddev
->ctime
= mddev
->utime
= 0;
5234 mddev
->max_disks
= 0;
5236 mddev
->can_decrease_events
= 0;
5237 mddev
->delta_disks
= 0;
5238 mddev
->reshape_backwards
= 0;
5239 mddev
->new_level
= LEVEL_NONE
;
5240 mddev
->new_layout
= 0;
5241 mddev
->new_chunk_sectors
= 0;
5242 mddev
->curr_resync
= 0;
5243 atomic64_set(&mddev
->resync_mismatches
, 0);
5244 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5245 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5246 mddev
->recovery
= 0;
5249 mddev
->degraded
= 0;
5250 mddev
->safemode
= 0;
5251 mddev
->merge_check_needed
= 0;
5252 mddev
->bitmap_info
.offset
= 0;
5253 mddev
->bitmap_info
.default_offset
= 0;
5254 mddev
->bitmap_info
.default_space
= 0;
5255 mddev
->bitmap_info
.chunksize
= 0;
5256 mddev
->bitmap_info
.daemon_sleep
= 0;
5257 mddev
->bitmap_info
.max_write_behind
= 0;
5260 static void __md_stop_writes(struct mddev
*mddev
)
5262 if (mddev_is_clustered(mddev
))
5263 md_cluster_ops
->metadata_update_start(mddev
);
5264 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5265 flush_workqueue(md_misc_wq
);
5266 if (mddev
->sync_thread
) {
5267 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5268 md_reap_sync_thread(mddev
);
5271 del_timer_sync(&mddev
->safemode_timer
);
5273 bitmap_flush(mddev
);
5274 md_super_wait(mddev
);
5276 if (mddev
->ro
== 0 &&
5277 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5278 /* mark array as shutdown cleanly */
5280 md_update_sb(mddev
, 1);
5282 if (mddev_is_clustered(mddev
))
5283 md_cluster_ops
->metadata_update_finish(mddev
);
5286 void md_stop_writes(struct mddev
*mddev
)
5288 mddev_lock_nointr(mddev
);
5289 __md_stop_writes(mddev
);
5290 mddev_unlock(mddev
);
5292 EXPORT_SYMBOL_GPL(md_stop_writes
);
5294 static void mddev_detach(struct mddev
*mddev
)
5296 struct bitmap
*bitmap
= mddev
->bitmap
;
5297 /* wait for behind writes to complete */
5298 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5299 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5301 /* need to kick something here to make sure I/O goes? */
5302 wait_event(bitmap
->behind_wait
,
5303 atomic_read(&bitmap
->behind_writes
) == 0);
5305 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5306 mddev
->pers
->quiesce(mddev
, 1);
5307 mddev
->pers
->quiesce(mddev
, 0);
5309 md_unregister_thread(&mddev
->thread
);
5311 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5314 static void __md_stop(struct mddev
*mddev
)
5316 struct md_personality
*pers
= mddev
->pers
;
5317 mddev_detach(mddev
);
5318 spin_lock(&mddev
->lock
);
5321 spin_unlock(&mddev
->lock
);
5322 pers
->free(mddev
, mddev
->private);
5323 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5324 mddev
->to_remove
= &md_redundancy_group
;
5325 module_put(pers
->owner
);
5326 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5329 void md_stop(struct mddev
*mddev
)
5331 /* stop the array and free an attached data structures.
5332 * This is called from dm-raid
5335 bitmap_destroy(mddev
);
5337 bioset_free(mddev
->bio_set
);
5340 EXPORT_SYMBOL_GPL(md_stop
);
5342 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5347 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5349 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5350 md_wakeup_thread(mddev
->thread
);
5352 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5353 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5354 if (mddev
->sync_thread
)
5355 /* Thread might be blocked waiting for metadata update
5356 * which will now never happen */
5357 wake_up_process(mddev
->sync_thread
->tsk
);
5359 mddev_unlock(mddev
);
5360 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5362 mddev_lock_nointr(mddev
);
5364 mutex_lock(&mddev
->open_mutex
);
5365 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5366 mddev
->sync_thread
||
5367 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5368 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5369 printk("md: %s still in use.\n",mdname(mddev
));
5371 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5372 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5373 md_wakeup_thread(mddev
->thread
);
5379 __md_stop_writes(mddev
);
5385 set_disk_ro(mddev
->gendisk
, 1);
5386 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5387 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5388 md_wakeup_thread(mddev
->thread
);
5389 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5393 mutex_unlock(&mddev
->open_mutex
);
5398 * 0 - completely stop and dis-assemble array
5399 * 2 - stop but do not disassemble array
5401 static int do_md_stop(struct mddev
*mddev
, int mode
,
5402 struct block_device
*bdev
)
5404 struct gendisk
*disk
= mddev
->gendisk
;
5405 struct md_rdev
*rdev
;
5408 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5410 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5411 md_wakeup_thread(mddev
->thread
);
5413 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5414 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5415 if (mddev
->sync_thread
)
5416 /* Thread might be blocked waiting for metadata update
5417 * which will now never happen */
5418 wake_up_process(mddev
->sync_thread
->tsk
);
5420 mddev_unlock(mddev
);
5421 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5422 !test_bit(MD_RECOVERY_RUNNING
,
5423 &mddev
->recovery
)));
5424 mddev_lock_nointr(mddev
);
5426 mutex_lock(&mddev
->open_mutex
);
5427 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5428 mddev
->sysfs_active
||
5429 mddev
->sync_thread
||
5430 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5431 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5432 printk("md: %s still in use.\n",mdname(mddev
));
5433 mutex_unlock(&mddev
->open_mutex
);
5435 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5436 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5437 md_wakeup_thread(mddev
->thread
);
5443 set_disk_ro(disk
, 0);
5445 __md_stop_writes(mddev
);
5447 mddev
->queue
->merge_bvec_fn
= NULL
;
5448 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5450 /* tell userspace to handle 'inactive' */
5451 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5453 rdev_for_each(rdev
, mddev
)
5454 if (rdev
->raid_disk
>= 0)
5455 sysfs_unlink_rdev(mddev
, rdev
);
5457 set_capacity(disk
, 0);
5458 mutex_unlock(&mddev
->open_mutex
);
5460 revalidate_disk(disk
);
5465 mutex_unlock(&mddev
->open_mutex
);
5467 * Free resources if final stop
5470 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5472 bitmap_destroy(mddev
);
5473 if (mddev
->bitmap_info
.file
) {
5474 struct file
*f
= mddev
->bitmap_info
.file
;
5475 spin_lock(&mddev
->lock
);
5476 mddev
->bitmap_info
.file
= NULL
;
5477 spin_unlock(&mddev
->lock
);
5480 mddev
->bitmap_info
.offset
= 0;
5482 export_array(mddev
);
5485 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5486 if (mddev
->hold_active
== UNTIL_STOP
)
5487 mddev
->hold_active
= 0;
5489 blk_integrity_unregister(disk
);
5490 md_new_event(mddev
);
5491 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5496 static void autorun_array(struct mddev
*mddev
)
5498 struct md_rdev
*rdev
;
5501 if (list_empty(&mddev
->disks
))
5504 printk(KERN_INFO
"md: running: ");
5506 rdev_for_each(rdev
, mddev
) {
5507 char b
[BDEVNAME_SIZE
];
5508 printk("<%s>", bdevname(rdev
->bdev
,b
));
5512 err
= do_md_run(mddev
);
5514 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5515 do_md_stop(mddev
, 0, NULL
);
5520 * lets try to run arrays based on all disks that have arrived
5521 * until now. (those are in pending_raid_disks)
5523 * the method: pick the first pending disk, collect all disks with
5524 * the same UUID, remove all from the pending list and put them into
5525 * the 'same_array' list. Then order this list based on superblock
5526 * update time (freshest comes first), kick out 'old' disks and
5527 * compare superblocks. If everything's fine then run it.
5529 * If "unit" is allocated, then bump its reference count
5531 static void autorun_devices(int part
)
5533 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5534 struct mddev
*mddev
;
5535 char b
[BDEVNAME_SIZE
];
5537 printk(KERN_INFO
"md: autorun ...\n");
5538 while (!list_empty(&pending_raid_disks
)) {
5541 LIST_HEAD(candidates
);
5542 rdev0
= list_entry(pending_raid_disks
.next
,
5543 struct md_rdev
, same_set
);
5545 printk(KERN_INFO
"md: considering %s ...\n",
5546 bdevname(rdev0
->bdev
,b
));
5547 INIT_LIST_HEAD(&candidates
);
5548 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5549 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5550 printk(KERN_INFO
"md: adding %s ...\n",
5551 bdevname(rdev
->bdev
,b
));
5552 list_move(&rdev
->same_set
, &candidates
);
5555 * now we have a set of devices, with all of them having
5556 * mostly sane superblocks. It's time to allocate the
5560 dev
= MKDEV(mdp_major
,
5561 rdev0
->preferred_minor
<< MdpMinorShift
);
5562 unit
= MINOR(dev
) >> MdpMinorShift
;
5564 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5567 if (rdev0
->preferred_minor
!= unit
) {
5568 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5569 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5573 md_probe(dev
, NULL
, NULL
);
5574 mddev
= mddev_find(dev
);
5575 if (!mddev
|| !mddev
->gendisk
) {
5579 "md: cannot allocate memory for md drive.\n");
5582 if (mddev_lock(mddev
))
5583 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5585 else if (mddev
->raid_disks
|| mddev
->major_version
5586 || !list_empty(&mddev
->disks
)) {
5588 "md: %s already running, cannot run %s\n",
5589 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5590 mddev_unlock(mddev
);
5592 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5593 mddev
->persistent
= 1;
5594 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5595 list_del_init(&rdev
->same_set
);
5596 if (bind_rdev_to_array(rdev
, mddev
))
5599 autorun_array(mddev
);
5600 mddev_unlock(mddev
);
5602 /* on success, candidates will be empty, on error
5605 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5606 list_del_init(&rdev
->same_set
);
5611 printk(KERN_INFO
"md: ... autorun DONE.\n");
5613 #endif /* !MODULE */
5615 static int get_version(void __user
*arg
)
5619 ver
.major
= MD_MAJOR_VERSION
;
5620 ver
.minor
= MD_MINOR_VERSION
;
5621 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5623 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5629 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5631 mdu_array_info_t info
;
5632 int nr
,working
,insync
,failed
,spare
;
5633 struct md_rdev
*rdev
;
5635 nr
= working
= insync
= failed
= spare
= 0;
5637 rdev_for_each_rcu(rdev
, mddev
) {
5639 if (test_bit(Faulty
, &rdev
->flags
))
5643 if (test_bit(In_sync
, &rdev
->flags
))
5651 info
.major_version
= mddev
->major_version
;
5652 info
.minor_version
= mddev
->minor_version
;
5653 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5654 info
.ctime
= mddev
->ctime
;
5655 info
.level
= mddev
->level
;
5656 info
.size
= mddev
->dev_sectors
/ 2;
5657 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5660 info
.raid_disks
= mddev
->raid_disks
;
5661 info
.md_minor
= mddev
->md_minor
;
5662 info
.not_persistent
= !mddev
->persistent
;
5664 info
.utime
= mddev
->utime
;
5667 info
.state
= (1<<MD_SB_CLEAN
);
5668 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5669 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5670 if (mddev_is_clustered(mddev
))
5671 info
.state
|= (1<<MD_SB_CLUSTERED
);
5672 info
.active_disks
= insync
;
5673 info
.working_disks
= working
;
5674 info
.failed_disks
= failed
;
5675 info
.spare_disks
= spare
;
5677 info
.layout
= mddev
->layout
;
5678 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5680 if (copy_to_user(arg
, &info
, sizeof(info
)))
5686 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5688 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5692 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5697 spin_lock(&mddev
->lock
);
5698 /* bitmap disabled, zero the first byte and copy out */
5699 if (!mddev
->bitmap_info
.file
)
5700 file
->pathname
[0] = '\0';
5701 else if ((ptr
= d_path(&mddev
->bitmap_info
.file
->f_path
,
5702 file
->pathname
, sizeof(file
->pathname
))),
5706 memmove(file
->pathname
, ptr
,
5707 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5708 spin_unlock(&mddev
->lock
);
5711 copy_to_user(arg
, file
, sizeof(*file
)))
5718 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5720 mdu_disk_info_t info
;
5721 struct md_rdev
*rdev
;
5723 if (copy_from_user(&info
, arg
, sizeof(info
)))
5727 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5729 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5730 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5731 info
.raid_disk
= rdev
->raid_disk
;
5733 if (test_bit(Faulty
, &rdev
->flags
))
5734 info
.state
|= (1<<MD_DISK_FAULTY
);
5735 else if (test_bit(In_sync
, &rdev
->flags
)) {
5736 info
.state
|= (1<<MD_DISK_ACTIVE
);
5737 info
.state
|= (1<<MD_DISK_SYNC
);
5739 if (test_bit(WriteMostly
, &rdev
->flags
))
5740 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5742 info
.major
= info
.minor
= 0;
5743 info
.raid_disk
= -1;
5744 info
.state
= (1<<MD_DISK_REMOVED
);
5748 if (copy_to_user(arg
, &info
, sizeof(info
)))
5754 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5756 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5757 struct md_rdev
*rdev
;
5758 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5760 if (mddev_is_clustered(mddev
) &&
5761 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5762 pr_err("%s: Cannot add to clustered mddev.\n",
5767 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5770 if (!mddev
->raid_disks
) {
5772 /* expecting a device which has a superblock */
5773 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5776 "md: md_import_device returned %ld\n",
5778 return PTR_ERR(rdev
);
5780 if (!list_empty(&mddev
->disks
)) {
5781 struct md_rdev
*rdev0
5782 = list_entry(mddev
->disks
.next
,
5783 struct md_rdev
, same_set
);
5784 err
= super_types
[mddev
->major_version
]
5785 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5788 "md: %s has different UUID to %s\n",
5789 bdevname(rdev
->bdev
,b
),
5790 bdevname(rdev0
->bdev
,b2
));
5795 err
= bind_rdev_to_array(rdev
, mddev
);
5802 * add_new_disk can be used once the array is assembled
5803 * to add "hot spares". They must already have a superblock
5808 if (!mddev
->pers
->hot_add_disk
) {
5810 "%s: personality does not support diskops!\n",
5814 if (mddev
->persistent
)
5815 rdev
= md_import_device(dev
, mddev
->major_version
,
5816 mddev
->minor_version
);
5818 rdev
= md_import_device(dev
, -1, -1);
5821 "md: md_import_device returned %ld\n",
5823 return PTR_ERR(rdev
);
5825 /* set saved_raid_disk if appropriate */
5826 if (!mddev
->persistent
) {
5827 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5828 info
->raid_disk
< mddev
->raid_disks
) {
5829 rdev
->raid_disk
= info
->raid_disk
;
5830 set_bit(In_sync
, &rdev
->flags
);
5831 clear_bit(Bitmap_sync
, &rdev
->flags
);
5833 rdev
->raid_disk
= -1;
5834 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5836 super_types
[mddev
->major_version
].
5837 validate_super(mddev
, rdev
);
5838 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5839 rdev
->raid_disk
!= info
->raid_disk
) {
5840 /* This was a hot-add request, but events doesn't
5841 * match, so reject it.
5847 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5848 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5849 set_bit(WriteMostly
, &rdev
->flags
);
5851 clear_bit(WriteMostly
, &rdev
->flags
);
5854 * check whether the device shows up in other nodes
5856 if (mddev_is_clustered(mddev
)) {
5857 if (info
->state
& (1 << MD_DISK_CANDIDATE
)) {
5858 /* Through --cluster-confirm */
5859 set_bit(Candidate
, &rdev
->flags
);
5860 err
= md_cluster_ops
->new_disk_ack(mddev
, true);
5865 } else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
5866 /* --add initiated by this node */
5867 err
= md_cluster_ops
->add_new_disk_start(mddev
, rdev
);
5869 md_cluster_ops
->add_new_disk_finish(mddev
);
5876 rdev
->raid_disk
= -1;
5877 err
= bind_rdev_to_array(rdev
, mddev
);
5878 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5879 /* If there is hot_add_disk but no hot_remove_disk
5880 * then added disks for geometry changes,
5881 * and should be added immediately.
5883 super_types
[mddev
->major_version
].
5884 validate_super(mddev
, rdev
);
5885 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5887 unbind_rdev_from_array(rdev
);
5892 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5894 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5895 if (mddev
->degraded
)
5896 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5897 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5899 md_new_event(mddev
);
5900 md_wakeup_thread(mddev
->thread
);
5901 if (mddev_is_clustered(mddev
) &&
5902 (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)))
5903 md_cluster_ops
->add_new_disk_finish(mddev
);
5907 /* otherwise, add_new_disk is only allowed
5908 * for major_version==0 superblocks
5910 if (mddev
->major_version
!= 0) {
5911 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5916 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5918 rdev
= md_import_device(dev
, -1, 0);
5921 "md: error, md_import_device() returned %ld\n",
5923 return PTR_ERR(rdev
);
5925 rdev
->desc_nr
= info
->number
;
5926 if (info
->raid_disk
< mddev
->raid_disks
)
5927 rdev
->raid_disk
= info
->raid_disk
;
5929 rdev
->raid_disk
= -1;
5931 if (rdev
->raid_disk
< mddev
->raid_disks
)
5932 if (info
->state
& (1<<MD_DISK_SYNC
))
5933 set_bit(In_sync
, &rdev
->flags
);
5935 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5936 set_bit(WriteMostly
, &rdev
->flags
);
5938 if (!mddev
->persistent
) {
5939 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5940 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5942 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5943 rdev
->sectors
= rdev
->sb_start
;
5945 err
= bind_rdev_to_array(rdev
, mddev
);
5955 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5957 char b
[BDEVNAME_SIZE
];
5958 struct md_rdev
*rdev
;
5960 rdev
= find_rdev(mddev
, dev
);
5964 if (mddev_is_clustered(mddev
))
5965 md_cluster_ops
->metadata_update_start(mddev
);
5967 clear_bit(Blocked
, &rdev
->flags
);
5968 remove_and_add_spares(mddev
, rdev
);
5970 if (rdev
->raid_disk
>= 0)
5973 if (mddev_is_clustered(mddev
))
5974 md_cluster_ops
->remove_disk(mddev
, rdev
);
5976 md_kick_rdev_from_array(rdev
);
5977 md_update_sb(mddev
, 1);
5978 md_new_event(mddev
);
5980 if (mddev_is_clustered(mddev
))
5981 md_cluster_ops
->metadata_update_finish(mddev
);
5985 if (mddev_is_clustered(mddev
))
5986 md_cluster_ops
->metadata_update_cancel(mddev
);
5987 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5988 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5992 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5994 char b
[BDEVNAME_SIZE
];
5996 struct md_rdev
*rdev
;
6001 if (mddev
->major_version
!= 0) {
6002 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6003 " version-0 superblocks.\n",
6007 if (!mddev
->pers
->hot_add_disk
) {
6009 "%s: personality does not support diskops!\n",
6014 rdev
= md_import_device(dev
, -1, 0);
6017 "md: error, md_import_device() returned %ld\n",
6022 if (mddev
->persistent
)
6023 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6025 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6027 rdev
->sectors
= rdev
->sb_start
;
6029 if (test_bit(Faulty
, &rdev
->flags
)) {
6031 "md: can not hot-add faulty %s disk to %s!\n",
6032 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6037 if (mddev_is_clustered(mddev
))
6038 md_cluster_ops
->metadata_update_start(mddev
);
6039 clear_bit(In_sync
, &rdev
->flags
);
6041 rdev
->saved_raid_disk
= -1;
6042 err
= bind_rdev_to_array(rdev
, mddev
);
6044 goto abort_clustered
;
6047 * The rest should better be atomic, we can have disk failures
6048 * noticed in interrupt contexts ...
6051 rdev
->raid_disk
= -1;
6053 md_update_sb(mddev
, 1);
6055 if (mddev_is_clustered(mddev
))
6056 md_cluster_ops
->metadata_update_finish(mddev
);
6058 * Kick recovery, maybe this spare has to be added to the
6059 * array immediately.
6061 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6062 md_wakeup_thread(mddev
->thread
);
6063 md_new_event(mddev
);
6067 if (mddev_is_clustered(mddev
))
6068 md_cluster_ops
->metadata_update_cancel(mddev
);
6074 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6079 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6081 if (mddev
->recovery
|| mddev
->sync_thread
)
6083 /* we should be able to change the bitmap.. */
6087 struct inode
*inode
;
6090 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6091 return -EEXIST
; /* cannot add when bitmap is present */
6095 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6100 inode
= f
->f_mapping
->host
;
6101 if (!S_ISREG(inode
->i_mode
)) {
6102 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6105 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6106 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6109 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6110 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6118 mddev
->bitmap_info
.file
= f
;
6119 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6120 } else if (mddev
->bitmap
== NULL
)
6121 return -ENOENT
; /* cannot remove what isn't there */
6124 mddev
->pers
->quiesce(mddev
, 1);
6126 struct bitmap
*bitmap
;
6128 bitmap
= bitmap_create(mddev
, -1);
6129 if (!IS_ERR(bitmap
)) {
6130 mddev
->bitmap
= bitmap
;
6131 err
= bitmap_load(mddev
);
6133 err
= PTR_ERR(bitmap
);
6135 if (fd
< 0 || err
) {
6136 bitmap_destroy(mddev
);
6137 fd
= -1; /* make sure to put the file */
6139 mddev
->pers
->quiesce(mddev
, 0);
6142 struct file
*f
= mddev
->bitmap_info
.file
;
6144 spin_lock(&mddev
->lock
);
6145 mddev
->bitmap_info
.file
= NULL
;
6146 spin_unlock(&mddev
->lock
);
6155 * set_array_info is used two different ways
6156 * The original usage is when creating a new array.
6157 * In this usage, raid_disks is > 0 and it together with
6158 * level, size, not_persistent,layout,chunksize determine the
6159 * shape of the array.
6160 * This will always create an array with a type-0.90.0 superblock.
6161 * The newer usage is when assembling an array.
6162 * In this case raid_disks will be 0, and the major_version field is
6163 * use to determine which style super-blocks are to be found on the devices.
6164 * The minor and patch _version numbers are also kept incase the
6165 * super_block handler wishes to interpret them.
6167 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6170 if (info
->raid_disks
== 0) {
6171 /* just setting version number for superblock loading */
6172 if (info
->major_version
< 0 ||
6173 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6174 super_types
[info
->major_version
].name
== NULL
) {
6175 /* maybe try to auto-load a module? */
6177 "md: superblock version %d not known\n",
6178 info
->major_version
);
6181 mddev
->major_version
= info
->major_version
;
6182 mddev
->minor_version
= info
->minor_version
;
6183 mddev
->patch_version
= info
->patch_version
;
6184 mddev
->persistent
= !info
->not_persistent
;
6185 /* ensure mddev_put doesn't delete this now that there
6186 * is some minimal configuration.
6188 mddev
->ctime
= get_seconds();
6191 mddev
->major_version
= MD_MAJOR_VERSION
;
6192 mddev
->minor_version
= MD_MINOR_VERSION
;
6193 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6194 mddev
->ctime
= get_seconds();
6196 mddev
->level
= info
->level
;
6197 mddev
->clevel
[0] = 0;
6198 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6199 mddev
->raid_disks
= info
->raid_disks
;
6200 /* don't set md_minor, it is determined by which /dev/md* was
6203 if (info
->state
& (1<<MD_SB_CLEAN
))
6204 mddev
->recovery_cp
= MaxSector
;
6206 mddev
->recovery_cp
= 0;
6207 mddev
->persistent
= ! info
->not_persistent
;
6208 mddev
->external
= 0;
6210 mddev
->layout
= info
->layout
;
6211 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6213 mddev
->max_disks
= MD_SB_DISKS
;
6215 if (mddev
->persistent
)
6217 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6219 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6220 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6221 mddev
->bitmap_info
.offset
= 0;
6223 mddev
->reshape_position
= MaxSector
;
6226 * Generate a 128 bit UUID
6228 get_random_bytes(mddev
->uuid
, 16);
6230 mddev
->new_level
= mddev
->level
;
6231 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6232 mddev
->new_layout
= mddev
->layout
;
6233 mddev
->delta_disks
= 0;
6234 mddev
->reshape_backwards
= 0;
6239 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6241 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6243 if (mddev
->external_size
)
6246 mddev
->array_sectors
= array_sectors
;
6248 EXPORT_SYMBOL(md_set_array_sectors
);
6250 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6252 struct md_rdev
*rdev
;
6254 int fit
= (num_sectors
== 0);
6256 if (mddev
->pers
->resize
== NULL
)
6258 /* The "num_sectors" is the number of sectors of each device that
6259 * is used. This can only make sense for arrays with redundancy.
6260 * linear and raid0 always use whatever space is available. We can only
6261 * consider changing this number if no resync or reconstruction is
6262 * happening, and if the new size is acceptable. It must fit before the
6263 * sb_start or, if that is <data_offset, it must fit before the size
6264 * of each device. If num_sectors is zero, we find the largest size
6267 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6273 rdev_for_each(rdev
, mddev
) {
6274 sector_t avail
= rdev
->sectors
;
6276 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6277 num_sectors
= avail
;
6278 if (avail
< num_sectors
)
6281 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6283 revalidate_disk(mddev
->gendisk
);
6287 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6290 struct md_rdev
*rdev
;
6291 /* change the number of raid disks */
6292 if (mddev
->pers
->check_reshape
== NULL
)
6296 if (raid_disks
<= 0 ||
6297 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6299 if (mddev
->sync_thread
||
6300 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6301 mddev
->reshape_position
!= MaxSector
)
6304 rdev_for_each(rdev
, mddev
) {
6305 if (mddev
->raid_disks
< raid_disks
&&
6306 rdev
->data_offset
< rdev
->new_data_offset
)
6308 if (mddev
->raid_disks
> raid_disks
&&
6309 rdev
->data_offset
> rdev
->new_data_offset
)
6313 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6314 if (mddev
->delta_disks
< 0)
6315 mddev
->reshape_backwards
= 1;
6316 else if (mddev
->delta_disks
> 0)
6317 mddev
->reshape_backwards
= 0;
6319 rv
= mddev
->pers
->check_reshape(mddev
);
6321 mddev
->delta_disks
= 0;
6322 mddev
->reshape_backwards
= 0;
6328 * update_array_info is used to change the configuration of an
6330 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6331 * fields in the info are checked against the array.
6332 * Any differences that cannot be handled will cause an error.
6333 * Normally, only one change can be managed at a time.
6335 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6341 /* calculate expected state,ignoring low bits */
6342 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6343 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6345 if (mddev
->major_version
!= info
->major_version
||
6346 mddev
->minor_version
!= info
->minor_version
||
6347 /* mddev->patch_version != info->patch_version || */
6348 mddev
->ctime
!= info
->ctime
||
6349 mddev
->level
!= info
->level
||
6350 /* mddev->layout != info->layout || */
6351 !mddev
->persistent
!= info
->not_persistent
||
6352 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6353 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6354 ((state
^info
->state
) & 0xfffffe00)
6357 /* Check there is only one change */
6358 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6360 if (mddev
->raid_disks
!= info
->raid_disks
)
6362 if (mddev
->layout
!= info
->layout
)
6364 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6371 if (mddev
->layout
!= info
->layout
) {
6373 * we don't need to do anything at the md level, the
6374 * personality will take care of it all.
6376 if (mddev
->pers
->check_reshape
== NULL
)
6379 mddev
->new_layout
= info
->layout
;
6380 rv
= mddev
->pers
->check_reshape(mddev
);
6382 mddev
->new_layout
= mddev
->layout
;
6386 if (mddev_is_clustered(mddev
))
6387 md_cluster_ops
->metadata_update_start(mddev
);
6388 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6389 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6391 if (mddev
->raid_disks
!= info
->raid_disks
)
6392 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6394 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6395 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6399 if (mddev
->recovery
|| mddev
->sync_thread
) {
6403 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6404 struct bitmap
*bitmap
;
6405 /* add the bitmap */
6406 if (mddev
->bitmap
) {
6410 if (mddev
->bitmap_info
.default_offset
== 0) {
6414 mddev
->bitmap_info
.offset
=
6415 mddev
->bitmap_info
.default_offset
;
6416 mddev
->bitmap_info
.space
=
6417 mddev
->bitmap_info
.default_space
;
6418 mddev
->pers
->quiesce(mddev
, 1);
6419 bitmap
= bitmap_create(mddev
, -1);
6420 if (!IS_ERR(bitmap
)) {
6421 mddev
->bitmap
= bitmap
;
6422 rv
= bitmap_load(mddev
);
6424 rv
= PTR_ERR(bitmap
);
6426 bitmap_destroy(mddev
);
6427 mddev
->pers
->quiesce(mddev
, 0);
6429 /* remove the bitmap */
6430 if (!mddev
->bitmap
) {
6434 if (mddev
->bitmap
->storage
.file
) {
6438 mddev
->pers
->quiesce(mddev
, 1);
6439 bitmap_destroy(mddev
);
6440 mddev
->pers
->quiesce(mddev
, 0);
6441 mddev
->bitmap_info
.offset
= 0;
6444 md_update_sb(mddev
, 1);
6445 if (mddev_is_clustered(mddev
))
6446 md_cluster_ops
->metadata_update_finish(mddev
);
6449 if (mddev_is_clustered(mddev
))
6450 md_cluster_ops
->metadata_update_cancel(mddev
);
6454 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6456 struct md_rdev
*rdev
;
6459 if (mddev
->pers
== NULL
)
6463 rdev
= find_rdev_rcu(mddev
, dev
);
6467 md_error(mddev
, rdev
);
6468 if (!test_bit(Faulty
, &rdev
->flags
))
6476 * We have a problem here : there is no easy way to give a CHS
6477 * virtual geometry. We currently pretend that we have a 2 heads
6478 * 4 sectors (with a BIG number of cylinders...). This drives
6479 * dosfs just mad... ;-)
6481 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6483 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6487 geo
->cylinders
= mddev
->array_sectors
/ 8;
6491 static inline bool md_ioctl_valid(unsigned int cmd
)
6496 case GET_ARRAY_INFO
:
6497 case GET_BITMAP_FILE
:
6500 case HOT_REMOVE_DISK
:
6503 case RESTART_ARRAY_RW
:
6505 case SET_ARRAY_INFO
:
6506 case SET_BITMAP_FILE
:
6507 case SET_DISK_FAULTY
:
6510 case CLUSTERED_DISK_NACK
:
6517 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6518 unsigned int cmd
, unsigned long arg
)
6521 void __user
*argp
= (void __user
*)arg
;
6522 struct mddev
*mddev
= NULL
;
6525 if (!md_ioctl_valid(cmd
))
6530 case GET_ARRAY_INFO
:
6534 if (!capable(CAP_SYS_ADMIN
))
6539 * Commands dealing with the RAID driver but not any
6544 err
= get_version(argp
);
6550 autostart_arrays(arg
);
6557 * Commands creating/starting a new array:
6560 mddev
= bdev
->bd_disk
->private_data
;
6567 /* Some actions do not requires the mutex */
6569 case GET_ARRAY_INFO
:
6570 if (!mddev
->raid_disks
&& !mddev
->external
)
6573 err
= get_array_info(mddev
, argp
);
6577 if (!mddev
->raid_disks
&& !mddev
->external
)
6580 err
= get_disk_info(mddev
, argp
);
6583 case SET_DISK_FAULTY
:
6584 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6587 case GET_BITMAP_FILE
:
6588 err
= get_bitmap_file(mddev
, argp
);
6593 if (cmd
== ADD_NEW_DISK
)
6594 /* need to ensure md_delayed_delete() has completed */
6595 flush_workqueue(md_misc_wq
);
6597 if (cmd
== HOT_REMOVE_DISK
)
6598 /* need to ensure recovery thread has run */
6599 wait_event_interruptible_timeout(mddev
->sb_wait
,
6600 !test_bit(MD_RECOVERY_NEEDED
,
6602 msecs_to_jiffies(5000));
6603 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6604 /* Need to flush page cache, and ensure no-one else opens
6607 mutex_lock(&mddev
->open_mutex
);
6608 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6609 mutex_unlock(&mddev
->open_mutex
);
6613 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6614 mutex_unlock(&mddev
->open_mutex
);
6615 sync_blockdev(bdev
);
6617 err
= mddev_lock(mddev
);
6620 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6625 if (cmd
== SET_ARRAY_INFO
) {
6626 mdu_array_info_t info
;
6628 memset(&info
, 0, sizeof(info
));
6629 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6634 err
= update_array_info(mddev
, &info
);
6636 printk(KERN_WARNING
"md: couldn't update"
6637 " array info. %d\n", err
);
6642 if (!list_empty(&mddev
->disks
)) {
6644 "md: array %s already has disks!\n",
6649 if (mddev
->raid_disks
) {
6651 "md: array %s already initialised!\n",
6656 err
= set_array_info(mddev
, &info
);
6658 printk(KERN_WARNING
"md: couldn't set"
6659 " array info. %d\n", err
);
6666 * Commands querying/configuring an existing array:
6668 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6669 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6670 if ((!mddev
->raid_disks
&& !mddev
->external
)
6671 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6672 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6673 && cmd
!= GET_BITMAP_FILE
) {
6679 * Commands even a read-only array can execute:
6682 case RESTART_ARRAY_RW
:
6683 err
= restart_array(mddev
);
6687 err
= do_md_stop(mddev
, 0, bdev
);
6691 err
= md_set_readonly(mddev
, bdev
);
6694 case HOT_REMOVE_DISK
:
6695 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6699 /* We can support ADD_NEW_DISK on read-only arrays
6700 * on if we are re-adding a preexisting device.
6701 * So require mddev->pers and MD_DISK_SYNC.
6704 mdu_disk_info_t info
;
6705 if (copy_from_user(&info
, argp
, sizeof(info
)))
6707 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6708 /* Need to clear read-only for this */
6711 err
= add_new_disk(mddev
, &info
);
6717 if (get_user(ro
, (int __user
*)(arg
))) {
6723 /* if the bdev is going readonly the value of mddev->ro
6724 * does not matter, no writes are coming
6729 /* are we are already prepared for writes? */
6733 /* transitioning to readauto need only happen for
6734 * arrays that call md_write_start
6737 err
= restart_array(mddev
);
6740 set_disk_ro(mddev
->gendisk
, 0);
6747 * The remaining ioctls are changing the state of the
6748 * superblock, so we do not allow them on read-only arrays.
6750 if (mddev
->ro
&& mddev
->pers
) {
6751 if (mddev
->ro
== 2) {
6753 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6754 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6755 /* mddev_unlock will wake thread */
6756 /* If a device failed while we were read-only, we
6757 * need to make sure the metadata is updated now.
6759 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6760 mddev_unlock(mddev
);
6761 wait_event(mddev
->sb_wait
,
6762 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6763 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6764 mddev_lock_nointr(mddev
);
6775 mdu_disk_info_t info
;
6776 if (copy_from_user(&info
, argp
, sizeof(info
)))
6779 err
= add_new_disk(mddev
, &info
);
6783 case CLUSTERED_DISK_NACK
:
6784 if (mddev_is_clustered(mddev
))
6785 md_cluster_ops
->new_disk_ack(mddev
, false);
6791 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6795 err
= do_md_run(mddev
);
6798 case SET_BITMAP_FILE
:
6799 err
= set_bitmap_file(mddev
, (int)arg
);
6808 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6810 mddev
->hold_active
= 0;
6811 mddev_unlock(mddev
);
6815 #ifdef CONFIG_COMPAT
6816 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6817 unsigned int cmd
, unsigned long arg
)
6820 case HOT_REMOVE_DISK
:
6822 case SET_DISK_FAULTY
:
6823 case SET_BITMAP_FILE
:
6824 /* These take in integer arg, do not convert */
6827 arg
= (unsigned long)compat_ptr(arg
);
6831 return md_ioctl(bdev
, mode
, cmd
, arg
);
6833 #endif /* CONFIG_COMPAT */
6835 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6838 * Succeed if we can lock the mddev, which confirms that
6839 * it isn't being stopped right now.
6841 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6847 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6848 /* we are racing with mddev_put which is discarding this
6852 /* Wait until bdev->bd_disk is definitely gone */
6853 flush_workqueue(md_misc_wq
);
6854 /* Then retry the open from the top */
6855 return -ERESTARTSYS
;
6857 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6859 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6863 atomic_inc(&mddev
->openers
);
6864 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6865 mutex_unlock(&mddev
->open_mutex
);
6867 check_disk_change(bdev
);
6872 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6874 struct mddev
*mddev
= disk
->private_data
;
6877 atomic_dec(&mddev
->openers
);
6881 static int md_media_changed(struct gendisk
*disk
)
6883 struct mddev
*mddev
= disk
->private_data
;
6885 return mddev
->changed
;
6888 static int md_revalidate(struct gendisk
*disk
)
6890 struct mddev
*mddev
= disk
->private_data
;
6895 static const struct block_device_operations md_fops
=
6897 .owner
= THIS_MODULE
,
6899 .release
= md_release
,
6901 #ifdef CONFIG_COMPAT
6902 .compat_ioctl
= md_compat_ioctl
,
6904 .getgeo
= md_getgeo
,
6905 .media_changed
= md_media_changed
,
6906 .revalidate_disk
= md_revalidate
,
6909 static int md_thread(void *arg
)
6911 struct md_thread
*thread
= arg
;
6914 * md_thread is a 'system-thread', it's priority should be very
6915 * high. We avoid resource deadlocks individually in each
6916 * raid personality. (RAID5 does preallocation) We also use RR and
6917 * the very same RT priority as kswapd, thus we will never get
6918 * into a priority inversion deadlock.
6920 * we definitely have to have equal or higher priority than
6921 * bdflush, otherwise bdflush will deadlock if there are too
6922 * many dirty RAID5 blocks.
6925 allow_signal(SIGKILL
);
6926 while (!kthread_should_stop()) {
6928 /* We need to wait INTERRUPTIBLE so that
6929 * we don't add to the load-average.
6930 * That means we need to be sure no signals are
6933 if (signal_pending(current
))
6934 flush_signals(current
);
6936 wait_event_interruptible_timeout
6938 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6939 || kthread_should_stop(),
6942 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6943 if (!kthread_should_stop())
6944 thread
->run(thread
);
6950 void md_wakeup_thread(struct md_thread
*thread
)
6953 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6954 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6955 wake_up(&thread
->wqueue
);
6958 EXPORT_SYMBOL(md_wakeup_thread
);
6960 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6961 struct mddev
*mddev
, const char *name
)
6963 struct md_thread
*thread
;
6965 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6969 init_waitqueue_head(&thread
->wqueue
);
6972 thread
->mddev
= mddev
;
6973 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6974 thread
->tsk
= kthread_run(md_thread
, thread
,
6976 mdname(thread
->mddev
),
6978 if (IS_ERR(thread
->tsk
)) {
6984 EXPORT_SYMBOL(md_register_thread
);
6986 void md_unregister_thread(struct md_thread
**threadp
)
6988 struct md_thread
*thread
= *threadp
;
6991 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6992 /* Locking ensures that mddev_unlock does not wake_up a
6993 * non-existent thread
6995 spin_lock(&pers_lock
);
6997 spin_unlock(&pers_lock
);
6999 kthread_stop(thread
->tsk
);
7002 EXPORT_SYMBOL(md_unregister_thread
);
7004 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7006 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7009 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7011 mddev
->pers
->error_handler(mddev
,rdev
);
7012 if (mddev
->degraded
)
7013 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7014 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7015 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7016 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7017 md_wakeup_thread(mddev
->thread
);
7018 if (mddev
->event_work
.func
)
7019 queue_work(md_misc_wq
, &mddev
->event_work
);
7020 md_new_event_inintr(mddev
);
7022 EXPORT_SYMBOL(md_error
);
7024 /* seq_file implementation /proc/mdstat */
7026 static void status_unused(struct seq_file
*seq
)
7029 struct md_rdev
*rdev
;
7031 seq_printf(seq
, "unused devices: ");
7033 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7034 char b
[BDEVNAME_SIZE
];
7036 seq_printf(seq
, "%s ",
7037 bdevname(rdev
->bdev
,b
));
7040 seq_printf(seq
, "<none>");
7042 seq_printf(seq
, "\n");
7045 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7047 sector_t max_sectors
, resync
, res
;
7048 unsigned long dt
, db
;
7051 unsigned int per_milli
;
7053 if (mddev
->curr_resync
<= 3)
7056 resync
= mddev
->curr_resync
7057 - atomic_read(&mddev
->recovery_active
);
7059 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7060 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7061 max_sectors
= mddev
->resync_max_sectors
;
7063 max_sectors
= mddev
->dev_sectors
;
7065 WARN_ON(max_sectors
== 0);
7066 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7067 * in a sector_t, and (max_sectors>>scale) will fit in a
7068 * u32, as those are the requirements for sector_div.
7069 * Thus 'scale' must be at least 10
7072 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7073 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7076 res
= (resync
>>scale
)*1000;
7077 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7081 int i
, x
= per_milli
/50, y
= 20-x
;
7082 seq_printf(seq
, "[");
7083 for (i
= 0; i
< x
; i
++)
7084 seq_printf(seq
, "=");
7085 seq_printf(seq
, ">");
7086 for (i
= 0; i
< y
; i
++)
7087 seq_printf(seq
, ".");
7088 seq_printf(seq
, "] ");
7090 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7091 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7093 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7095 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7096 "resync" : "recovery"))),
7097 per_milli
/10, per_milli
% 10,
7098 (unsigned long long) resync
/2,
7099 (unsigned long long) max_sectors
/2);
7102 * dt: time from mark until now
7103 * db: blocks written from mark until now
7104 * rt: remaining time
7106 * rt is a sector_t, so could be 32bit or 64bit.
7107 * So we divide before multiply in case it is 32bit and close
7109 * We scale the divisor (db) by 32 to avoid losing precision
7110 * near the end of resync when the number of remaining sectors
7112 * We then divide rt by 32 after multiplying by db to compensate.
7113 * The '+1' avoids division by zero if db is very small.
7115 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7117 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7118 - mddev
->resync_mark_cnt
;
7120 rt
= max_sectors
- resync
; /* number of remaining sectors */
7121 sector_div(rt
, db
/32+1);
7125 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7126 ((unsigned long)rt
% 60)/6);
7128 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7131 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7133 struct list_head
*tmp
;
7135 struct mddev
*mddev
;
7143 spin_lock(&all_mddevs_lock
);
7144 list_for_each(tmp
,&all_mddevs
)
7146 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7148 spin_unlock(&all_mddevs_lock
);
7151 spin_unlock(&all_mddevs_lock
);
7153 return (void*)2;/* tail */
7157 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7159 struct list_head
*tmp
;
7160 struct mddev
*next_mddev
, *mddev
= v
;
7166 spin_lock(&all_mddevs_lock
);
7168 tmp
= all_mddevs
.next
;
7170 tmp
= mddev
->all_mddevs
.next
;
7171 if (tmp
!= &all_mddevs
)
7172 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7174 next_mddev
= (void*)2;
7177 spin_unlock(&all_mddevs_lock
);
7185 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7187 struct mddev
*mddev
= v
;
7189 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7193 static int md_seq_show(struct seq_file
*seq
, void *v
)
7195 struct mddev
*mddev
= v
;
7197 struct md_rdev
*rdev
;
7199 if (v
== (void*)1) {
7200 struct md_personality
*pers
;
7201 seq_printf(seq
, "Personalities : ");
7202 spin_lock(&pers_lock
);
7203 list_for_each_entry(pers
, &pers_list
, list
)
7204 seq_printf(seq
, "[%s] ", pers
->name
);
7206 spin_unlock(&pers_lock
);
7207 seq_printf(seq
, "\n");
7208 seq
->poll_event
= atomic_read(&md_event_count
);
7211 if (v
== (void*)2) {
7216 spin_lock(&mddev
->lock
);
7217 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7218 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7219 mddev
->pers
? "" : "in");
7222 seq_printf(seq
, " (read-only)");
7224 seq_printf(seq
, " (auto-read-only)");
7225 seq_printf(seq
, " %s", mddev
->pers
->name
);
7230 rdev_for_each_rcu(rdev
, mddev
) {
7231 char b
[BDEVNAME_SIZE
];
7232 seq_printf(seq
, " %s[%d]",
7233 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7234 if (test_bit(WriteMostly
, &rdev
->flags
))
7235 seq_printf(seq
, "(W)");
7236 if (test_bit(Faulty
, &rdev
->flags
)) {
7237 seq_printf(seq
, "(F)");
7240 if (rdev
->raid_disk
< 0)
7241 seq_printf(seq
, "(S)"); /* spare */
7242 if (test_bit(Replacement
, &rdev
->flags
))
7243 seq_printf(seq
, "(R)");
7244 sectors
+= rdev
->sectors
;
7248 if (!list_empty(&mddev
->disks
)) {
7250 seq_printf(seq
, "\n %llu blocks",
7251 (unsigned long long)
7252 mddev
->array_sectors
/ 2);
7254 seq_printf(seq
, "\n %llu blocks",
7255 (unsigned long long)sectors
/ 2);
7257 if (mddev
->persistent
) {
7258 if (mddev
->major_version
!= 0 ||
7259 mddev
->minor_version
!= 90) {
7260 seq_printf(seq
," super %d.%d",
7261 mddev
->major_version
,
7262 mddev
->minor_version
);
7264 } else if (mddev
->external
)
7265 seq_printf(seq
, " super external:%s",
7266 mddev
->metadata_type
);
7268 seq_printf(seq
, " super non-persistent");
7271 mddev
->pers
->status(seq
, mddev
);
7272 seq_printf(seq
, "\n ");
7273 if (mddev
->pers
->sync_request
) {
7274 if (mddev
->curr_resync
> 2) {
7275 status_resync(seq
, mddev
);
7276 seq_printf(seq
, "\n ");
7277 } else if (mddev
->curr_resync
>= 1)
7278 seq_printf(seq
, "\tresync=DELAYED\n ");
7279 else if (mddev
->recovery_cp
< MaxSector
)
7280 seq_printf(seq
, "\tresync=PENDING\n ");
7283 seq_printf(seq
, "\n ");
7285 bitmap_status(seq
, mddev
->bitmap
);
7287 seq_printf(seq
, "\n");
7289 spin_unlock(&mddev
->lock
);
7294 static const struct seq_operations md_seq_ops
= {
7295 .start
= md_seq_start
,
7296 .next
= md_seq_next
,
7297 .stop
= md_seq_stop
,
7298 .show
= md_seq_show
,
7301 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7303 struct seq_file
*seq
;
7306 error
= seq_open(file
, &md_seq_ops
);
7310 seq
= file
->private_data
;
7311 seq
->poll_event
= atomic_read(&md_event_count
);
7315 static int md_unloading
;
7316 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7318 struct seq_file
*seq
= filp
->private_data
;
7322 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7323 poll_wait(filp
, &md_event_waiters
, wait
);
7325 /* always allow read */
7326 mask
= POLLIN
| POLLRDNORM
;
7328 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7329 mask
|= POLLERR
| POLLPRI
;
7333 static const struct file_operations md_seq_fops
= {
7334 .owner
= THIS_MODULE
,
7335 .open
= md_seq_open
,
7337 .llseek
= seq_lseek
,
7338 .release
= seq_release_private
,
7339 .poll
= mdstat_poll
,
7342 int register_md_personality(struct md_personality
*p
)
7344 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7346 spin_lock(&pers_lock
);
7347 list_add_tail(&p
->list
, &pers_list
);
7348 spin_unlock(&pers_lock
);
7351 EXPORT_SYMBOL(register_md_personality
);
7353 int unregister_md_personality(struct md_personality
*p
)
7355 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7356 spin_lock(&pers_lock
);
7357 list_del_init(&p
->list
);
7358 spin_unlock(&pers_lock
);
7361 EXPORT_SYMBOL(unregister_md_personality
);
7363 int register_md_cluster_operations(struct md_cluster_operations
*ops
, struct module
*module
)
7365 if (md_cluster_ops
!= NULL
)
7367 spin_lock(&pers_lock
);
7368 md_cluster_ops
= ops
;
7369 md_cluster_mod
= module
;
7370 spin_unlock(&pers_lock
);
7373 EXPORT_SYMBOL(register_md_cluster_operations
);
7375 int unregister_md_cluster_operations(void)
7377 spin_lock(&pers_lock
);
7378 md_cluster_ops
= NULL
;
7379 spin_unlock(&pers_lock
);
7382 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7384 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7388 err
= request_module("md-cluster");
7390 pr_err("md-cluster module not found.\n");
7394 spin_lock(&pers_lock
);
7395 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7396 spin_unlock(&pers_lock
);
7399 spin_unlock(&pers_lock
);
7401 return md_cluster_ops
->join(mddev
, nodes
);
7404 void md_cluster_stop(struct mddev
*mddev
)
7406 if (!md_cluster_ops
)
7408 md_cluster_ops
->leave(mddev
);
7409 module_put(md_cluster_mod
);
7412 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7414 struct md_rdev
*rdev
;
7420 rdev_for_each_rcu(rdev
, mddev
) {
7421 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7422 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7423 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7424 atomic_read(&disk
->sync_io
);
7425 /* sync IO will cause sync_io to increase before the disk_stats
7426 * as sync_io is counted when a request starts, and
7427 * disk_stats is counted when it completes.
7428 * So resync activity will cause curr_events to be smaller than
7429 * when there was no such activity.
7430 * non-sync IO will cause disk_stat to increase without
7431 * increasing sync_io so curr_events will (eventually)
7432 * be larger than it was before. Once it becomes
7433 * substantially larger, the test below will cause
7434 * the array to appear non-idle, and resync will slow
7436 * If there is a lot of outstanding resync activity when
7437 * we set last_event to curr_events, then all that activity
7438 * completing might cause the array to appear non-idle
7439 * and resync will be slowed down even though there might
7440 * not have been non-resync activity. This will only
7441 * happen once though. 'last_events' will soon reflect
7442 * the state where there is little or no outstanding
7443 * resync requests, and further resync activity will
7444 * always make curr_events less than last_events.
7447 if (init
|| curr_events
- rdev
->last_events
> 64) {
7448 rdev
->last_events
= curr_events
;
7456 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7458 /* another "blocks" (512byte) blocks have been synced */
7459 atomic_sub(blocks
, &mddev
->recovery_active
);
7460 wake_up(&mddev
->recovery_wait
);
7462 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7463 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7464 md_wakeup_thread(mddev
->thread
);
7465 // stop recovery, signal do_sync ....
7468 EXPORT_SYMBOL(md_done_sync
);
7470 /* md_write_start(mddev, bi)
7471 * If we need to update some array metadata (e.g. 'active' flag
7472 * in superblock) before writing, schedule a superblock update
7473 * and wait for it to complete.
7475 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7478 if (bio_data_dir(bi
) != WRITE
)
7481 BUG_ON(mddev
->ro
== 1);
7482 if (mddev
->ro
== 2) {
7483 /* need to switch to read/write */
7485 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7486 md_wakeup_thread(mddev
->thread
);
7487 md_wakeup_thread(mddev
->sync_thread
);
7490 atomic_inc(&mddev
->writes_pending
);
7491 if (mddev
->safemode
== 1)
7492 mddev
->safemode
= 0;
7493 if (mddev
->in_sync
) {
7494 spin_lock(&mddev
->lock
);
7495 if (mddev
->in_sync
) {
7497 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7498 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7499 md_wakeup_thread(mddev
->thread
);
7502 spin_unlock(&mddev
->lock
);
7505 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7506 wait_event(mddev
->sb_wait
,
7507 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7509 EXPORT_SYMBOL(md_write_start
);
7511 void md_write_end(struct mddev
*mddev
)
7513 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7514 if (mddev
->safemode
== 2)
7515 md_wakeup_thread(mddev
->thread
);
7516 else if (mddev
->safemode_delay
)
7517 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7520 EXPORT_SYMBOL(md_write_end
);
7522 /* md_allow_write(mddev)
7523 * Calling this ensures that the array is marked 'active' so that writes
7524 * may proceed without blocking. It is important to call this before
7525 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7526 * Must be called with mddev_lock held.
7528 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7529 * is dropped, so return -EAGAIN after notifying userspace.
7531 int md_allow_write(struct mddev
*mddev
)
7537 if (!mddev
->pers
->sync_request
)
7540 spin_lock(&mddev
->lock
);
7541 if (mddev
->in_sync
) {
7543 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7544 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7545 if (mddev
->safemode_delay
&&
7546 mddev
->safemode
== 0)
7547 mddev
->safemode
= 1;
7548 spin_unlock(&mddev
->lock
);
7549 if (mddev_is_clustered(mddev
))
7550 md_cluster_ops
->metadata_update_start(mddev
);
7551 md_update_sb(mddev
, 0);
7552 if (mddev_is_clustered(mddev
))
7553 md_cluster_ops
->metadata_update_finish(mddev
);
7554 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7556 spin_unlock(&mddev
->lock
);
7558 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7563 EXPORT_SYMBOL_GPL(md_allow_write
);
7565 #define SYNC_MARKS 10
7566 #define SYNC_MARK_STEP (3*HZ)
7567 #define UPDATE_FREQUENCY (5*60*HZ)
7568 void md_do_sync(struct md_thread
*thread
)
7570 struct mddev
*mddev
= thread
->mddev
;
7571 struct mddev
*mddev2
;
7572 unsigned int currspeed
= 0,
7574 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7575 unsigned long mark
[SYNC_MARKS
];
7576 unsigned long update_time
;
7577 sector_t mark_cnt
[SYNC_MARKS
];
7579 struct list_head
*tmp
;
7580 sector_t last_check
;
7582 struct md_rdev
*rdev
;
7583 char *desc
, *action
= NULL
;
7584 struct blk_plug plug
;
7586 /* just incase thread restarts... */
7587 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7589 if (mddev
->ro
) {/* never try to sync a read-only array */
7590 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7594 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7595 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7596 desc
= "data-check";
7598 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7599 desc
= "requested-resync";
7603 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7608 mddev
->last_sync_action
= action
?: desc
;
7610 /* we overload curr_resync somewhat here.
7611 * 0 == not engaged in resync at all
7612 * 2 == checking that there is no conflict with another sync
7613 * 1 == like 2, but have yielded to allow conflicting resync to
7615 * other == active in resync - this many blocks
7617 * Before starting a resync we must have set curr_resync to
7618 * 2, and then checked that every "conflicting" array has curr_resync
7619 * less than ours. When we find one that is the same or higher
7620 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7621 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7622 * This will mean we have to start checking from the beginning again.
7627 mddev
->curr_resync
= 2;
7630 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7632 for_each_mddev(mddev2
, tmp
) {
7633 if (mddev2
== mddev
)
7635 if (!mddev
->parallel_resync
7636 && mddev2
->curr_resync
7637 && match_mddev_units(mddev
, mddev2
)) {
7639 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7640 /* arbitrarily yield */
7641 mddev
->curr_resync
= 1;
7642 wake_up(&resync_wait
);
7644 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7645 /* no need to wait here, we can wait the next
7646 * time 'round when curr_resync == 2
7649 /* We need to wait 'interruptible' so as not to
7650 * contribute to the load average, and not to
7651 * be caught by 'softlockup'
7653 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7654 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7655 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7656 printk(KERN_INFO
"md: delaying %s of %s"
7657 " until %s has finished (they"
7658 " share one or more physical units)\n",
7659 desc
, mdname(mddev
), mdname(mddev2
));
7661 if (signal_pending(current
))
7662 flush_signals(current
);
7664 finish_wait(&resync_wait
, &wq
);
7667 finish_wait(&resync_wait
, &wq
);
7670 } while (mddev
->curr_resync
< 2);
7673 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7674 /* resync follows the size requested by the personality,
7675 * which defaults to physical size, but can be virtual size
7677 max_sectors
= mddev
->resync_max_sectors
;
7678 atomic64_set(&mddev
->resync_mismatches
, 0);
7679 /* we don't use the checkpoint if there's a bitmap */
7680 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7681 j
= mddev
->resync_min
;
7682 else if (!mddev
->bitmap
)
7683 j
= mddev
->recovery_cp
;
7685 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7686 max_sectors
= mddev
->resync_max_sectors
;
7688 /* recovery follows the physical size of devices */
7689 max_sectors
= mddev
->dev_sectors
;
7692 rdev_for_each_rcu(rdev
, mddev
)
7693 if (rdev
->raid_disk
>= 0 &&
7694 !test_bit(Faulty
, &rdev
->flags
) &&
7695 !test_bit(In_sync
, &rdev
->flags
) &&
7696 rdev
->recovery_offset
< j
)
7697 j
= rdev
->recovery_offset
;
7700 /* If there is a bitmap, we need to make sure all
7701 * writes that started before we added a spare
7702 * complete before we start doing a recovery.
7703 * Otherwise the write might complete and (via
7704 * bitmap_endwrite) set a bit in the bitmap after the
7705 * recovery has checked that bit and skipped that
7708 if (mddev
->bitmap
) {
7709 mddev
->pers
->quiesce(mddev
, 1);
7710 mddev
->pers
->quiesce(mddev
, 0);
7714 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7715 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7716 " %d KB/sec/disk.\n", speed_min(mddev
));
7717 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7718 "(but not more than %d KB/sec) for %s.\n",
7719 speed_max(mddev
), desc
);
7721 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7724 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7726 mark_cnt
[m
] = io_sectors
;
7729 mddev
->resync_mark
= mark
[last_mark
];
7730 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7733 * Tune reconstruction:
7735 window
= 32*(PAGE_SIZE
/512);
7736 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7737 window
/2, (unsigned long long)max_sectors
/2);
7739 atomic_set(&mddev
->recovery_active
, 0);
7744 "md: resuming %s of %s from checkpoint.\n",
7745 desc
, mdname(mddev
));
7746 mddev
->curr_resync
= j
;
7748 mddev
->curr_resync
= 3; /* no longer delayed */
7749 mddev
->curr_resync_completed
= j
;
7750 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7751 md_new_event(mddev
);
7752 update_time
= jiffies
;
7754 if (mddev_is_clustered(mddev
))
7755 md_cluster_ops
->resync_start(mddev
, j
, max_sectors
);
7757 blk_start_plug(&plug
);
7758 while (j
< max_sectors
) {
7763 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7764 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7765 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7766 > (max_sectors
>> 4)) ||
7767 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7768 (j
- mddev
->curr_resync_completed
)*2
7769 >= mddev
->resync_max
- mddev
->curr_resync_completed
7771 /* time to update curr_resync_completed */
7772 wait_event(mddev
->recovery_wait
,
7773 atomic_read(&mddev
->recovery_active
) == 0);
7774 mddev
->curr_resync_completed
= j
;
7775 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7776 j
> mddev
->recovery_cp
)
7777 mddev
->recovery_cp
= j
;
7778 update_time
= jiffies
;
7779 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7780 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7783 while (j
>= mddev
->resync_max
&&
7784 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7785 /* As this condition is controlled by user-space,
7786 * we can block indefinitely, so use '_interruptible'
7787 * to avoid triggering warnings.
7789 flush_signals(current
); /* just in case */
7790 wait_event_interruptible(mddev
->recovery_wait
,
7791 mddev
->resync_max
> j
7792 || test_bit(MD_RECOVERY_INTR
,
7796 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7799 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7800 currspeed
< speed_min(mddev
));
7802 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7806 if (!skipped
) { /* actual IO requested */
7807 io_sectors
+= sectors
;
7808 atomic_add(sectors
, &mddev
->recovery_active
);
7811 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7816 mddev
->curr_resync
= j
;
7817 if (mddev_is_clustered(mddev
))
7818 md_cluster_ops
->resync_info_update(mddev
, j
, max_sectors
);
7819 mddev
->curr_mark_cnt
= io_sectors
;
7820 if (last_check
== 0)
7821 /* this is the earliest that rebuild will be
7822 * visible in /proc/mdstat
7824 md_new_event(mddev
);
7826 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7829 last_check
= io_sectors
;
7831 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7833 int next
= (last_mark
+1) % SYNC_MARKS
;
7835 mddev
->resync_mark
= mark
[next
];
7836 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7837 mark
[next
] = jiffies
;
7838 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7842 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7846 * this loop exits only if either when we are slower than
7847 * the 'hard' speed limit, or the system was IO-idle for
7849 * the system might be non-idle CPU-wise, but we only care
7850 * about not overloading the IO subsystem. (things like an
7851 * e2fsck being done on the RAID array should execute fast)
7855 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7856 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7857 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7859 if (currspeed
> speed_min(mddev
)) {
7860 if ((currspeed
> speed_max(mddev
)) ||
7861 !is_mddev_idle(mddev
, 0)) {
7867 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7868 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7869 ? "interrupted" : "done");
7871 * this also signals 'finished resyncing' to md_stop
7873 blk_finish_plug(&plug
);
7874 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7876 /* tell personality that we are finished */
7877 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7879 if (mddev_is_clustered(mddev
))
7880 md_cluster_ops
->resync_finish(mddev
);
7882 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7883 mddev
->curr_resync
> 2) {
7884 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7885 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7886 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7888 "md: checkpointing %s of %s.\n",
7889 desc
, mdname(mddev
));
7890 if (test_bit(MD_RECOVERY_ERROR
,
7892 mddev
->recovery_cp
=
7893 mddev
->curr_resync_completed
;
7895 mddev
->recovery_cp
=
7899 mddev
->recovery_cp
= MaxSector
;
7901 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7902 mddev
->curr_resync
= MaxSector
;
7904 rdev_for_each_rcu(rdev
, mddev
)
7905 if (rdev
->raid_disk
>= 0 &&
7906 mddev
->delta_disks
>= 0 &&
7907 !test_bit(Faulty
, &rdev
->flags
) &&
7908 !test_bit(In_sync
, &rdev
->flags
) &&
7909 rdev
->recovery_offset
< mddev
->curr_resync
)
7910 rdev
->recovery_offset
= mddev
->curr_resync
;
7915 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7917 spin_lock(&mddev
->lock
);
7918 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7919 /* We completed so min/max setting can be forgotten if used. */
7920 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7921 mddev
->resync_min
= 0;
7922 mddev
->resync_max
= MaxSector
;
7923 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7924 mddev
->resync_min
= mddev
->curr_resync_completed
;
7925 mddev
->curr_resync
= 0;
7926 spin_unlock(&mddev
->lock
);
7928 wake_up(&resync_wait
);
7929 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7930 md_wakeup_thread(mddev
->thread
);
7933 EXPORT_SYMBOL_GPL(md_do_sync
);
7935 static int remove_and_add_spares(struct mddev
*mddev
,
7936 struct md_rdev
*this)
7938 struct md_rdev
*rdev
;
7942 rdev_for_each(rdev
, mddev
)
7943 if ((this == NULL
|| rdev
== this) &&
7944 rdev
->raid_disk
>= 0 &&
7945 !test_bit(Blocked
, &rdev
->flags
) &&
7946 (test_bit(Faulty
, &rdev
->flags
) ||
7947 ! test_bit(In_sync
, &rdev
->flags
)) &&
7948 atomic_read(&rdev
->nr_pending
)==0) {
7949 if (mddev
->pers
->hot_remove_disk(
7950 mddev
, rdev
) == 0) {
7951 sysfs_unlink_rdev(mddev
, rdev
);
7952 rdev
->raid_disk
= -1;
7956 if (removed
&& mddev
->kobj
.sd
)
7957 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7962 rdev_for_each(rdev
, mddev
) {
7963 if (rdev
->raid_disk
>= 0 &&
7964 !test_bit(In_sync
, &rdev
->flags
) &&
7965 !test_bit(Faulty
, &rdev
->flags
))
7967 if (rdev
->raid_disk
>= 0)
7969 if (test_bit(Faulty
, &rdev
->flags
))
7972 ! (rdev
->saved_raid_disk
>= 0 &&
7973 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7976 if (rdev
->saved_raid_disk
< 0)
7977 rdev
->recovery_offset
= 0;
7979 hot_add_disk(mddev
, rdev
) == 0) {
7980 if (sysfs_link_rdev(mddev
, rdev
))
7981 /* failure here is OK */;
7983 md_new_event(mddev
);
7984 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7989 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7993 static void md_start_sync(struct work_struct
*ws
)
7995 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7997 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8000 if (!mddev
->sync_thread
) {
8001 printk(KERN_ERR
"%s: could not start resync"
8004 /* leave the spares where they are, it shouldn't hurt */
8005 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8006 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8007 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8008 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8009 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8010 wake_up(&resync_wait
);
8011 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8013 if (mddev
->sysfs_action
)
8014 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8016 md_wakeup_thread(mddev
->sync_thread
);
8017 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8018 md_new_event(mddev
);
8022 * This routine is regularly called by all per-raid-array threads to
8023 * deal with generic issues like resync and super-block update.
8024 * Raid personalities that don't have a thread (linear/raid0) do not
8025 * need this as they never do any recovery or update the superblock.
8027 * It does not do any resync itself, but rather "forks" off other threads
8028 * to do that as needed.
8029 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8030 * "->recovery" and create a thread at ->sync_thread.
8031 * When the thread finishes it sets MD_RECOVERY_DONE
8032 * and wakeups up this thread which will reap the thread and finish up.
8033 * This thread also removes any faulty devices (with nr_pending == 0).
8035 * The overall approach is:
8036 * 1/ if the superblock needs updating, update it.
8037 * 2/ If a recovery thread is running, don't do anything else.
8038 * 3/ If recovery has finished, clean up, possibly marking spares active.
8039 * 4/ If there are any faulty devices, remove them.
8040 * 5/ If array is degraded, try to add spares devices
8041 * 6/ If array has spares or is not in-sync, start a resync thread.
8043 void md_check_recovery(struct mddev
*mddev
)
8045 if (mddev
->suspended
)
8049 bitmap_daemon_work(mddev
);
8051 if (signal_pending(current
)) {
8052 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8053 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8055 mddev
->safemode
= 2;
8057 flush_signals(current
);
8060 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8063 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8064 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8065 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8066 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8067 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8068 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8072 if (mddev_trylock(mddev
)) {
8076 /* On a read-only array we can:
8077 * - remove failed devices
8078 * - add already-in_sync devices if the array itself
8080 * As we only add devices that are already in-sync,
8081 * we can activate the spares immediately.
8083 remove_and_add_spares(mddev
, NULL
);
8084 /* There is no thread, but we need to call
8085 * ->spare_active and clear saved_raid_disk
8087 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8088 md_reap_sync_thread(mddev
);
8089 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8093 if (!mddev
->external
) {
8095 spin_lock(&mddev
->lock
);
8096 if (mddev
->safemode
&&
8097 !atomic_read(&mddev
->writes_pending
) &&
8099 mddev
->recovery_cp
== MaxSector
) {
8102 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8104 if (mddev
->safemode
== 1)
8105 mddev
->safemode
= 0;
8106 spin_unlock(&mddev
->lock
);
8108 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8111 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
) {
8112 if (mddev_is_clustered(mddev
))
8113 md_cluster_ops
->metadata_update_start(mddev
);
8114 md_update_sb(mddev
, 0);
8115 if (mddev_is_clustered(mddev
))
8116 md_cluster_ops
->metadata_update_finish(mddev
);
8119 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8120 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8121 /* resync/recovery still happening */
8122 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8125 if (mddev
->sync_thread
) {
8126 md_reap_sync_thread(mddev
);
8129 /* Set RUNNING before clearing NEEDED to avoid
8130 * any transients in the value of "sync_action".
8132 mddev
->curr_resync_completed
= 0;
8133 spin_lock(&mddev
->lock
);
8134 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8135 spin_unlock(&mddev
->lock
);
8136 /* Clear some bits that don't mean anything, but
8139 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8140 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8142 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8143 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8145 /* no recovery is running.
8146 * remove any failed drives, then
8147 * add spares if possible.
8148 * Spares are also removed and re-added, to allow
8149 * the personality to fail the re-add.
8152 if (mddev
->reshape_position
!= MaxSector
) {
8153 if (mddev
->pers
->check_reshape
== NULL
||
8154 mddev
->pers
->check_reshape(mddev
) != 0)
8155 /* Cannot proceed */
8157 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8158 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8159 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8160 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8161 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8162 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8163 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8164 } else if (mddev
->recovery_cp
< MaxSector
) {
8165 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8166 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8167 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8168 /* nothing to be done ... */
8171 if (mddev
->pers
->sync_request
) {
8173 /* We are adding a device or devices to an array
8174 * which has the bitmap stored on all devices.
8175 * So make sure all bitmap pages get written
8177 bitmap_write_all(mddev
->bitmap
);
8179 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8180 queue_work(md_misc_wq
, &mddev
->del_work
);
8184 if (!mddev
->sync_thread
) {
8185 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8186 wake_up(&resync_wait
);
8187 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8189 if (mddev
->sysfs_action
)
8190 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8193 wake_up(&mddev
->sb_wait
);
8194 mddev_unlock(mddev
);
8197 EXPORT_SYMBOL(md_check_recovery
);
8199 void md_reap_sync_thread(struct mddev
*mddev
)
8201 struct md_rdev
*rdev
;
8203 /* resync has finished, collect result */
8204 md_unregister_thread(&mddev
->sync_thread
);
8205 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8206 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8208 /* activate any spares */
8209 if (mddev
->pers
->spare_active(mddev
)) {
8210 sysfs_notify(&mddev
->kobj
, NULL
,
8212 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8215 if (mddev_is_clustered(mddev
))
8216 md_cluster_ops
->metadata_update_start(mddev
);
8217 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8218 mddev
->pers
->finish_reshape
)
8219 mddev
->pers
->finish_reshape(mddev
);
8221 /* If array is no-longer degraded, then any saved_raid_disk
8222 * information must be scrapped.
8224 if (!mddev
->degraded
)
8225 rdev_for_each(rdev
, mddev
)
8226 rdev
->saved_raid_disk
= -1;
8228 md_update_sb(mddev
, 1);
8229 if (mddev_is_clustered(mddev
))
8230 md_cluster_ops
->metadata_update_finish(mddev
);
8231 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8232 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8233 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8234 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8235 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8236 wake_up(&resync_wait
);
8237 /* flag recovery needed just to double check */
8238 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8239 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8240 md_new_event(mddev
);
8241 if (mddev
->event_work
.func
)
8242 queue_work(md_misc_wq
, &mddev
->event_work
);
8244 EXPORT_SYMBOL(md_reap_sync_thread
);
8246 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8248 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8249 wait_event_timeout(rdev
->blocked_wait
,
8250 !test_bit(Blocked
, &rdev
->flags
) &&
8251 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8252 msecs_to_jiffies(5000));
8253 rdev_dec_pending(rdev
, mddev
);
8255 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8257 void md_finish_reshape(struct mddev
*mddev
)
8259 /* called be personality module when reshape completes. */
8260 struct md_rdev
*rdev
;
8262 rdev_for_each(rdev
, mddev
) {
8263 if (rdev
->data_offset
> rdev
->new_data_offset
)
8264 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8266 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8267 rdev
->data_offset
= rdev
->new_data_offset
;
8270 EXPORT_SYMBOL(md_finish_reshape
);
8272 /* Bad block management.
8273 * We can record which blocks on each device are 'bad' and so just
8274 * fail those blocks, or that stripe, rather than the whole device.
8275 * Entries in the bad-block table are 64bits wide. This comprises:
8276 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8277 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8278 * A 'shift' can be set so that larger blocks are tracked and
8279 * consequently larger devices can be covered.
8280 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8282 * Locking of the bad-block table uses a seqlock so md_is_badblock
8283 * might need to retry if it is very unlucky.
8284 * We will sometimes want to check for bad blocks in a bi_end_io function,
8285 * so we use the write_seqlock_irq variant.
8287 * When looking for a bad block we specify a range and want to
8288 * know if any block in the range is bad. So we binary-search
8289 * to the last range that starts at-or-before the given endpoint,
8290 * (or "before the sector after the target range")
8291 * then see if it ends after the given start.
8293 * 0 if there are no known bad blocks in the range
8294 * 1 if there are known bad block which are all acknowledged
8295 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8296 * plus the start/length of the first bad section we overlap.
8298 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8299 sector_t
*first_bad
, int *bad_sectors
)
8305 sector_t target
= s
+ sectors
;
8308 if (bb
->shift
> 0) {
8309 /* round the start down, and the end up */
8311 target
+= (1<<bb
->shift
) - 1;
8312 target
>>= bb
->shift
;
8313 sectors
= target
- s
;
8315 /* 'target' is now the first block after the bad range */
8318 seq
= read_seqbegin(&bb
->lock
);
8323 /* Binary search between lo and hi for 'target'
8324 * i.e. for the last range that starts before 'target'
8326 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8327 * are known not to be the last range before target.
8328 * VARIANT: hi-lo is the number of possible
8329 * ranges, and decreases until it reaches 1
8331 while (hi
- lo
> 1) {
8332 int mid
= (lo
+ hi
) / 2;
8333 sector_t a
= BB_OFFSET(p
[mid
]);
8335 /* This could still be the one, earlier ranges
8339 /* This and later ranges are definitely out. */
8342 /* 'lo' might be the last that started before target, but 'hi' isn't */
8344 /* need to check all range that end after 's' to see if
8345 * any are unacknowledged.
8348 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8349 if (BB_OFFSET(p
[lo
]) < target
) {
8350 /* starts before the end, and finishes after
8351 * the start, so they must overlap
8353 if (rv
!= -1 && BB_ACK(p
[lo
]))
8357 *first_bad
= BB_OFFSET(p
[lo
]);
8358 *bad_sectors
= BB_LEN(p
[lo
]);
8364 if (read_seqretry(&bb
->lock
, seq
))
8369 EXPORT_SYMBOL_GPL(md_is_badblock
);
8372 * Add a range of bad blocks to the table.
8373 * This might extend the table, or might contract it
8374 * if two adjacent ranges can be merged.
8375 * We binary-search to find the 'insertion' point, then
8376 * decide how best to handle it.
8378 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8384 unsigned long flags
;
8387 /* badblocks are disabled */
8391 /* round the start down, and the end up */
8392 sector_t next
= s
+ sectors
;
8394 next
+= (1<<bb
->shift
) - 1;
8399 write_seqlock_irqsave(&bb
->lock
, flags
);
8404 /* Find the last range that starts at-or-before 's' */
8405 while (hi
- lo
> 1) {
8406 int mid
= (lo
+ hi
) / 2;
8407 sector_t a
= BB_OFFSET(p
[mid
]);
8413 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8417 /* we found a range that might merge with the start
8420 sector_t a
= BB_OFFSET(p
[lo
]);
8421 sector_t e
= a
+ BB_LEN(p
[lo
]);
8422 int ack
= BB_ACK(p
[lo
]);
8424 /* Yes, we can merge with a previous range */
8425 if (s
== a
&& s
+ sectors
>= e
)
8426 /* new range covers old */
8429 ack
= ack
&& acknowledged
;
8431 if (e
< s
+ sectors
)
8433 if (e
- a
<= BB_MAX_LEN
) {
8434 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8437 /* does not all fit in one range,
8438 * make p[lo] maximal
8440 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8441 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8447 if (sectors
&& hi
< bb
->count
) {
8448 /* 'hi' points to the first range that starts after 's'.
8449 * Maybe we can merge with the start of that range */
8450 sector_t a
= BB_OFFSET(p
[hi
]);
8451 sector_t e
= a
+ BB_LEN(p
[hi
]);
8452 int ack
= BB_ACK(p
[hi
]);
8453 if (a
<= s
+ sectors
) {
8454 /* merging is possible */
8455 if (e
<= s
+ sectors
) {
8460 ack
= ack
&& acknowledged
;
8463 if (e
- a
<= BB_MAX_LEN
) {
8464 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8467 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8475 if (sectors
== 0 && hi
< bb
->count
) {
8476 /* we might be able to combine lo and hi */
8477 /* Note: 's' is at the end of 'lo' */
8478 sector_t a
= BB_OFFSET(p
[hi
]);
8479 int lolen
= BB_LEN(p
[lo
]);
8480 int hilen
= BB_LEN(p
[hi
]);
8481 int newlen
= lolen
+ hilen
- (s
- a
);
8482 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8483 /* yes, we can combine them */
8484 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8485 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8486 memmove(p
+ hi
, p
+ hi
+ 1,
8487 (bb
->count
- hi
- 1) * 8);
8492 /* didn't merge (it all).
8493 * Need to add a range just before 'hi' */
8494 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8495 /* No room for more */
8499 int this_sectors
= sectors
;
8500 memmove(p
+ hi
+ 1, p
+ hi
,
8501 (bb
->count
- hi
) * 8);
8504 if (this_sectors
> BB_MAX_LEN
)
8505 this_sectors
= BB_MAX_LEN
;
8506 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8507 sectors
-= this_sectors
;
8514 bb
->unacked_exist
= 1;
8515 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8520 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8525 s
+= rdev
->new_data_offset
;
8527 s
+= rdev
->data_offset
;
8528 rv
= md_set_badblocks(&rdev
->badblocks
,
8531 /* Make sure they get written out promptly */
8532 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8533 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8534 md_wakeup_thread(rdev
->mddev
->thread
);
8538 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8541 * Remove a range of bad blocks from the table.
8542 * This may involve extending the table if we spilt a region,
8543 * but it must not fail. So if the table becomes full, we just
8544 * drop the remove request.
8546 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8550 sector_t target
= s
+ sectors
;
8553 if (bb
->shift
> 0) {
8554 /* When clearing we round the start up and the end down.
8555 * This should not matter as the shift should align with
8556 * the block size and no rounding should ever be needed.
8557 * However it is better the think a block is bad when it
8558 * isn't than to think a block is not bad when it is.
8560 s
+= (1<<bb
->shift
) - 1;
8562 target
>>= bb
->shift
;
8563 sectors
= target
- s
;
8566 write_seqlock_irq(&bb
->lock
);
8571 /* Find the last range that starts before 'target' */
8572 while (hi
- lo
> 1) {
8573 int mid
= (lo
+ hi
) / 2;
8574 sector_t a
= BB_OFFSET(p
[mid
]);
8581 /* p[lo] is the last range that could overlap the
8582 * current range. Earlier ranges could also overlap,
8583 * but only this one can overlap the end of the range.
8585 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8586 /* Partial overlap, leave the tail of this range */
8587 int ack
= BB_ACK(p
[lo
]);
8588 sector_t a
= BB_OFFSET(p
[lo
]);
8589 sector_t end
= a
+ BB_LEN(p
[lo
]);
8592 /* we need to split this range */
8593 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8597 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8599 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8602 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8603 /* there is no longer an overlap */
8608 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8609 /* This range does overlap */
8610 if (BB_OFFSET(p
[lo
]) < s
) {
8611 /* Keep the early parts of this range. */
8612 int ack
= BB_ACK(p
[lo
]);
8613 sector_t start
= BB_OFFSET(p
[lo
]);
8614 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8615 /* now low doesn't overlap, so.. */
8620 /* 'lo' is strictly before, 'hi' is strictly after,
8621 * anything between needs to be discarded
8624 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8625 bb
->count
-= (hi
- lo
- 1);
8631 write_sequnlock_irq(&bb
->lock
);
8635 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8639 s
+= rdev
->new_data_offset
;
8641 s
+= rdev
->data_offset
;
8642 return md_clear_badblocks(&rdev
->badblocks
,
8645 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8648 * Acknowledge all bad blocks in a list.
8649 * This only succeeds if ->changed is clear. It is used by
8650 * in-kernel metadata updates
8652 void md_ack_all_badblocks(struct badblocks
*bb
)
8654 if (bb
->page
== NULL
|| bb
->changed
)
8655 /* no point even trying */
8657 write_seqlock_irq(&bb
->lock
);
8659 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8662 for (i
= 0; i
< bb
->count
; i
++) {
8663 if (!BB_ACK(p
[i
])) {
8664 sector_t start
= BB_OFFSET(p
[i
]);
8665 int len
= BB_LEN(p
[i
]);
8666 p
[i
] = BB_MAKE(start
, len
, 1);
8669 bb
->unacked_exist
= 0;
8671 write_sequnlock_irq(&bb
->lock
);
8673 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8675 /* sysfs access to bad-blocks list.
8676 * We present two files.
8677 * 'bad-blocks' lists sector numbers and lengths of ranges that
8678 * are recorded as bad. The list is truncated to fit within
8679 * the one-page limit of sysfs.
8680 * Writing "sector length" to this file adds an acknowledged
8682 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8683 * been acknowledged. Writing to this file adds bad blocks
8684 * without acknowledging them. This is largely for testing.
8688 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8699 seq
= read_seqbegin(&bb
->lock
);
8704 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8705 sector_t s
= BB_OFFSET(p
[i
]);
8706 unsigned int length
= BB_LEN(p
[i
]);
8707 int ack
= BB_ACK(p
[i
]);
8713 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8714 (unsigned long long)s
<< bb
->shift
,
8715 length
<< bb
->shift
);
8717 if (unack
&& len
== 0)
8718 bb
->unacked_exist
= 0;
8720 if (read_seqretry(&bb
->lock
, seq
))
8729 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8731 unsigned long long sector
;
8735 /* Allow clearing via sysfs *only* for testing/debugging.
8736 * Normally only a successful write may clear a badblock
8739 if (page
[0] == '-') {
8743 #endif /* DO_DEBUG */
8745 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8747 if (newline
!= '\n')
8759 md_clear_badblocks(bb
, sector
, length
);
8762 #endif /* DO_DEBUG */
8763 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8769 static int md_notify_reboot(struct notifier_block
*this,
8770 unsigned long code
, void *x
)
8772 struct list_head
*tmp
;
8773 struct mddev
*mddev
;
8776 for_each_mddev(mddev
, tmp
) {
8777 if (mddev_trylock(mddev
)) {
8779 __md_stop_writes(mddev
);
8780 if (mddev
->persistent
)
8781 mddev
->safemode
= 2;
8782 mddev_unlock(mddev
);
8787 * certain more exotic SCSI devices are known to be
8788 * volatile wrt too early system reboots. While the
8789 * right place to handle this issue is the given
8790 * driver, we do want to have a safe RAID driver ...
8798 static struct notifier_block md_notifier
= {
8799 .notifier_call
= md_notify_reboot
,
8801 .priority
= INT_MAX
, /* before any real devices */
8804 static void md_geninit(void)
8806 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8808 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8811 static int __init
md_init(void)
8815 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8819 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8823 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8826 if ((ret
= register_blkdev(0, "mdp")) < 0)
8830 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8831 md_probe
, NULL
, NULL
);
8832 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8833 md_probe
, NULL
, NULL
);
8835 register_reboot_notifier(&md_notifier
);
8836 raid_table_header
= register_sysctl_table(raid_root_table
);
8842 unregister_blkdev(MD_MAJOR
, "md");
8844 destroy_workqueue(md_misc_wq
);
8846 destroy_workqueue(md_wq
);
8851 void md_reload_sb(struct mddev
*mddev
)
8853 struct md_rdev
*rdev
, *tmp
;
8855 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8856 rdev
->sb_loaded
= 0;
8857 ClearPageUptodate(rdev
->sb_page
);
8859 mddev
->raid_disks
= 0;
8861 rdev_for_each_safe(rdev
, tmp
, mddev
) {
8862 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8863 /* since we don't write to faulty devices, we figure out if the
8864 * disk is faulty by comparing events
8866 if (mddev
->events
> sb
->events
)
8867 set_bit(Faulty
, &rdev
->flags
);
8871 EXPORT_SYMBOL(md_reload_sb
);
8876 * Searches all registered partitions for autorun RAID arrays
8880 static LIST_HEAD(all_detected_devices
);
8881 struct detected_devices_node
{
8882 struct list_head list
;
8886 void md_autodetect_dev(dev_t dev
)
8888 struct detected_devices_node
*node_detected_dev
;
8890 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8891 if (node_detected_dev
) {
8892 node_detected_dev
->dev
= dev
;
8893 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8895 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8896 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8900 static void autostart_arrays(int part
)
8902 struct md_rdev
*rdev
;
8903 struct detected_devices_node
*node_detected_dev
;
8905 int i_scanned
, i_passed
;
8910 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8912 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8914 node_detected_dev
= list_entry(all_detected_devices
.next
,
8915 struct detected_devices_node
, list
);
8916 list_del(&node_detected_dev
->list
);
8917 dev
= node_detected_dev
->dev
;
8918 kfree(node_detected_dev
);
8919 rdev
= md_import_device(dev
,0, 90);
8923 if (test_bit(Faulty
, &rdev
->flags
))
8926 set_bit(AutoDetected
, &rdev
->flags
);
8927 list_add(&rdev
->same_set
, &pending_raid_disks
);
8931 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8932 i_scanned
, i_passed
);
8934 autorun_devices(part
);
8937 #endif /* !MODULE */
8939 static __exit
void md_exit(void)
8941 struct mddev
*mddev
;
8942 struct list_head
*tmp
;
8945 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8946 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8948 unregister_blkdev(MD_MAJOR
,"md");
8949 unregister_blkdev(mdp_major
, "mdp");
8950 unregister_reboot_notifier(&md_notifier
);
8951 unregister_sysctl_table(raid_table_header
);
8953 /* We cannot unload the modules while some process is
8954 * waiting for us in select() or poll() - wake them up
8957 while (waitqueue_active(&md_event_waiters
)) {
8958 /* not safe to leave yet */
8959 wake_up(&md_event_waiters
);
8963 remove_proc_entry("mdstat", NULL
);
8965 for_each_mddev(mddev
, tmp
) {
8966 export_array(mddev
);
8967 mddev
->hold_active
= 0;
8969 destroy_workqueue(md_misc_wq
);
8970 destroy_workqueue(md_wq
);
8973 subsys_initcall(md_init
);
8974 module_exit(md_exit
)
8976 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8978 return sprintf(buffer
, "%d", start_readonly
);
8980 static int set_ro(const char *val
, struct kernel_param
*kp
)
8983 int num
= simple_strtoul(val
, &e
, 10);
8984 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8985 start_readonly
= num
;
8991 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8992 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8993 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8995 MODULE_LICENSE("GPL");
8996 MODULE_DESCRIPTION("MD RAID framework");
8998 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);