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/badblocks.h>
38 #include <linux/sysctl.h>
39 #include <linux/seq_file.h>
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/module.h>
48 #include <linux/reboot.h>
49 #include <linux/file.h>
50 #include <linux/compat.h>
51 #include <linux/delay.h>
52 #include <linux/raid/md_p.h>
53 #include <linux/raid/md_u.h>
54 #include <linux/slab.h>
57 #include "md-cluster.h"
60 static void autostart_arrays(int part
);
63 /* pers_list is a list of registered personalities protected
65 * pers_lock does extra service to protect accesses to
66 * mddev->thread when the mutex cannot be held.
68 static LIST_HEAD(pers_list
);
69 static DEFINE_SPINLOCK(pers_lock
);
71 struct md_cluster_operations
*md_cluster_ops
;
72 EXPORT_SYMBOL(md_cluster_ops
);
73 struct module
*md_cluster_mod
;
74 EXPORT_SYMBOL(md_cluster_mod
);
76 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
77 static struct workqueue_struct
*md_wq
;
78 static struct workqueue_struct
*md_misc_wq
;
80 static int remove_and_add_spares(struct mddev
*mddev
,
81 struct md_rdev
*this);
82 static void mddev_detach(struct mddev
*mddev
);
85 * Default number of read corrections we'll attempt on an rdev
86 * before ejecting it from the array. We divide the read error
87 * count by 2 for every hour elapsed between read errors.
89 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
91 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
92 * is 1000 KB/sec, so the extra system load does not show up that much.
93 * Increase it if you want to have more _guaranteed_ speed. Note that
94 * the RAID driver will use the maximum available bandwidth if the IO
95 * subsystem is idle. There is also an 'absolute maximum' reconstruction
96 * speed limit - in case reconstruction slows down your system despite
99 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
100 * or /sys/block/mdX/md/sync_speed_{min,max}
103 static int sysctl_speed_limit_min
= 1000;
104 static int sysctl_speed_limit_max
= 200000;
105 static inline int speed_min(struct mddev
*mddev
)
107 return mddev
->sync_speed_min
?
108 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
111 static inline int speed_max(struct mddev
*mddev
)
113 return mddev
->sync_speed_max
?
114 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
117 static struct ctl_table_header
*raid_table_header
;
119 static struct ctl_table raid_table
[] = {
121 .procname
= "speed_limit_min",
122 .data
= &sysctl_speed_limit_min
,
123 .maxlen
= sizeof(int),
124 .mode
= S_IRUGO
|S_IWUSR
,
125 .proc_handler
= proc_dointvec
,
128 .procname
= "speed_limit_max",
129 .data
= &sysctl_speed_limit_max
,
130 .maxlen
= sizeof(int),
131 .mode
= S_IRUGO
|S_IWUSR
,
132 .proc_handler
= proc_dointvec
,
137 static struct ctl_table raid_dir_table
[] = {
141 .mode
= S_IRUGO
|S_IXUGO
,
147 static struct ctl_table raid_root_table
[] = {
152 .child
= raid_dir_table
,
157 static const struct block_device_operations md_fops
;
159 static int start_readonly
;
162 * like bio_clone, but with a local bio set
165 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
170 if (!mddev
|| !mddev
->bio_set
)
171 return bio_alloc(gfp_mask
, nr_iovecs
);
173 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
178 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
180 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
183 if (!mddev
|| !mddev
->bio_set
)
184 return bio_clone(bio
, gfp_mask
);
186 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
188 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
191 * We have a system wide 'event count' that is incremented
192 * on any 'interesting' event, and readers of /proc/mdstat
193 * can use 'poll' or 'select' to find out when the event
197 * start array, stop array, error, add device, remove device,
198 * start build, activate spare
200 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
201 static atomic_t md_event_count
;
202 void md_new_event(struct mddev
*mddev
)
204 atomic_inc(&md_event_count
);
205 wake_up(&md_event_waiters
);
207 EXPORT_SYMBOL_GPL(md_new_event
);
209 /* Alternate version that can be called from interrupts
210 * when calling sysfs_notify isn't needed.
212 static void md_new_event_inintr(struct mddev
*mddev
)
214 atomic_inc(&md_event_count
);
215 wake_up(&md_event_waiters
);
219 * Enables to iterate over all existing md arrays
220 * all_mddevs_lock protects this list.
222 static LIST_HEAD(all_mddevs
);
223 static DEFINE_SPINLOCK(all_mddevs_lock
);
226 * iterates through all used mddevs in the system.
227 * We take care to grab the all_mddevs_lock whenever navigating
228 * the list, and to always hold a refcount when unlocked.
229 * Any code which breaks out of this loop while own
230 * a reference to the current mddev and must mddev_put it.
232 #define for_each_mddev(_mddev,_tmp) \
234 for (({ spin_lock(&all_mddevs_lock); \
235 _tmp = all_mddevs.next; \
237 ({ if (_tmp != &all_mddevs) \
238 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
239 spin_unlock(&all_mddevs_lock); \
240 if (_mddev) mddev_put(_mddev); \
241 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
242 _tmp != &all_mddevs;}); \
243 ({ spin_lock(&all_mddevs_lock); \
244 _tmp = _tmp->next;}) \
247 /* Rather than calling directly into the personality make_request function,
248 * IO requests come here first so that we can check if the device is
249 * being suspended pending a reconfiguration.
250 * We hold a refcount over the call to ->make_request. By the time that
251 * call has finished, the bio has been linked into some internal structure
252 * and so is visible to ->quiesce(), so we don't need the refcount any more.
254 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
256 const int rw
= bio_data_dir(bio
);
257 struct mddev
*mddev
= q
->queuedata
;
258 unsigned int sectors
;
261 blk_queue_split(q
, &bio
, q
->bio_split
);
263 if (mddev
== NULL
|| mddev
->pers
== NULL
266 return BLK_QC_T_NONE
;
268 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
269 if (bio_sectors(bio
) != 0)
270 bio
->bi_error
= -EROFS
;
272 return BLK_QC_T_NONE
;
274 smp_rmb(); /* Ensure implications of 'active' are visible */
276 if (mddev
->suspended
) {
279 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
280 TASK_UNINTERRUPTIBLE
);
281 if (!mddev
->suspended
)
287 finish_wait(&mddev
->sb_wait
, &__wait
);
289 atomic_inc(&mddev
->active_io
);
293 * save the sectors now since our bio can
294 * go away inside make_request
296 sectors
= bio_sectors(bio
);
297 mddev
->pers
->make_request(mddev
, bio
);
299 cpu
= part_stat_lock();
300 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
301 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
304 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
305 wake_up(&mddev
->sb_wait
);
307 return BLK_QC_T_NONE
;
310 /* mddev_suspend makes sure no new requests are submitted
311 * to the device, and that any requests that have been submitted
312 * are completely handled.
313 * Once mddev_detach() is called and completes, the module will be
316 void mddev_suspend(struct mddev
*mddev
)
318 if (mddev
->suspended
++)
321 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
322 mddev
->pers
->quiesce(mddev
, 1);
324 del_timer_sync(&mddev
->safemode_timer
);
326 EXPORT_SYMBOL_GPL(mddev_suspend
);
328 void mddev_resume(struct mddev
*mddev
)
330 if (--mddev
->suspended
)
332 wake_up(&mddev
->sb_wait
);
333 mddev
->pers
->quiesce(mddev
, 0);
335 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
336 md_wakeup_thread(mddev
->thread
);
337 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
339 EXPORT_SYMBOL_GPL(mddev_resume
);
341 int mddev_congested(struct mddev
*mddev
, int bits
)
343 struct md_personality
*pers
= mddev
->pers
;
347 if (mddev
->suspended
)
349 else if (pers
&& pers
->congested
)
350 ret
= pers
->congested(mddev
, bits
);
354 EXPORT_SYMBOL_GPL(mddev_congested
);
355 static int md_congested(void *data
, int bits
)
357 struct mddev
*mddev
= data
;
358 return mddev_congested(mddev
, bits
);
362 * Generic flush handling for md
365 static void md_end_flush(struct bio
*bio
)
367 struct md_rdev
*rdev
= bio
->bi_private
;
368 struct mddev
*mddev
= rdev
->mddev
;
370 rdev_dec_pending(rdev
, mddev
);
372 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
373 /* The pre-request flush has finished */
374 queue_work(md_wq
, &mddev
->flush_work
);
379 static void md_submit_flush_data(struct work_struct
*ws
);
381 static void submit_flushes(struct work_struct
*ws
)
383 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
384 struct md_rdev
*rdev
;
386 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
387 atomic_set(&mddev
->flush_pending
, 1);
389 rdev_for_each_rcu(rdev
, mddev
)
390 if (rdev
->raid_disk
>= 0 &&
391 !test_bit(Faulty
, &rdev
->flags
)) {
392 /* Take two references, one is dropped
393 * when request finishes, one after
394 * we reclaim rcu_read_lock
397 atomic_inc(&rdev
->nr_pending
);
398 atomic_inc(&rdev
->nr_pending
);
400 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
401 bi
->bi_end_io
= md_end_flush
;
402 bi
->bi_private
= rdev
;
403 bi
->bi_bdev
= rdev
->bdev
;
404 atomic_inc(&mddev
->flush_pending
);
405 submit_bio(WRITE_FLUSH
, bi
);
407 rdev_dec_pending(rdev
, mddev
);
410 if (atomic_dec_and_test(&mddev
->flush_pending
))
411 queue_work(md_wq
, &mddev
->flush_work
);
414 static void md_submit_flush_data(struct work_struct
*ws
)
416 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
417 struct bio
*bio
= mddev
->flush_bio
;
419 if (bio
->bi_iter
.bi_size
== 0)
420 /* an empty barrier - all done */
423 bio
->bi_rw
&= ~REQ_FLUSH
;
424 mddev
->pers
->make_request(mddev
, bio
);
427 mddev
->flush_bio
= NULL
;
428 wake_up(&mddev
->sb_wait
);
431 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
433 spin_lock_irq(&mddev
->lock
);
434 wait_event_lock_irq(mddev
->sb_wait
,
437 mddev
->flush_bio
= bio
;
438 spin_unlock_irq(&mddev
->lock
);
440 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
441 queue_work(md_wq
, &mddev
->flush_work
);
443 EXPORT_SYMBOL(md_flush_request
);
445 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
447 struct mddev
*mddev
= cb
->data
;
448 md_wakeup_thread(mddev
->thread
);
451 EXPORT_SYMBOL(md_unplug
);
453 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
455 atomic_inc(&mddev
->active
);
459 static void mddev_delayed_delete(struct work_struct
*ws
);
461 static void mddev_put(struct mddev
*mddev
)
463 struct bio_set
*bs
= NULL
;
465 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
467 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
468 mddev
->ctime
== 0 && !mddev
->hold_active
) {
469 /* Array is not configured at all, and not held active,
471 list_del_init(&mddev
->all_mddevs
);
473 mddev
->bio_set
= NULL
;
474 if (mddev
->gendisk
) {
475 /* We did a probe so need to clean up. Call
476 * queue_work inside the spinlock so that
477 * flush_workqueue() after mddev_find will
478 * succeed in waiting for the work to be done.
480 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
481 queue_work(md_misc_wq
, &mddev
->del_work
);
485 spin_unlock(&all_mddevs_lock
);
490 static void md_safemode_timeout(unsigned long data
);
492 void mddev_init(struct mddev
*mddev
)
494 mutex_init(&mddev
->open_mutex
);
495 mutex_init(&mddev
->reconfig_mutex
);
496 mutex_init(&mddev
->bitmap_info
.mutex
);
497 INIT_LIST_HEAD(&mddev
->disks
);
498 INIT_LIST_HEAD(&mddev
->all_mddevs
);
499 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
500 (unsigned long) mddev
);
501 atomic_set(&mddev
->active
, 1);
502 atomic_set(&mddev
->openers
, 0);
503 atomic_set(&mddev
->active_io
, 0);
504 spin_lock_init(&mddev
->lock
);
505 atomic_set(&mddev
->flush_pending
, 0);
506 init_waitqueue_head(&mddev
->sb_wait
);
507 init_waitqueue_head(&mddev
->recovery_wait
);
508 mddev
->reshape_position
= MaxSector
;
509 mddev
->reshape_backwards
= 0;
510 mddev
->last_sync_action
= "none";
511 mddev
->resync_min
= 0;
512 mddev
->resync_max
= MaxSector
;
513 mddev
->level
= LEVEL_NONE
;
515 EXPORT_SYMBOL_GPL(mddev_init
);
517 static struct mddev
*mddev_find(dev_t unit
)
519 struct mddev
*mddev
, *new = NULL
;
521 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
522 unit
&= ~((1<<MdpMinorShift
)-1);
525 spin_lock(&all_mddevs_lock
);
528 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
529 if (mddev
->unit
== unit
) {
531 spin_unlock(&all_mddevs_lock
);
537 list_add(&new->all_mddevs
, &all_mddevs
);
538 spin_unlock(&all_mddevs_lock
);
539 new->hold_active
= UNTIL_IOCTL
;
543 /* find an unused unit number */
544 static int next_minor
= 512;
545 int start
= next_minor
;
549 dev
= MKDEV(MD_MAJOR
, next_minor
);
551 if (next_minor
> MINORMASK
)
553 if (next_minor
== start
) {
554 /* Oh dear, all in use. */
555 spin_unlock(&all_mddevs_lock
);
561 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
562 if (mddev
->unit
== dev
) {
568 new->md_minor
= MINOR(dev
);
569 new->hold_active
= UNTIL_STOP
;
570 list_add(&new->all_mddevs
, &all_mddevs
);
571 spin_unlock(&all_mddevs_lock
);
574 spin_unlock(&all_mddevs_lock
);
576 new = kzalloc(sizeof(*new), GFP_KERNEL
);
581 if (MAJOR(unit
) == MD_MAJOR
)
582 new->md_minor
= MINOR(unit
);
584 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
591 static struct attribute_group md_redundancy_group
;
593 void mddev_unlock(struct mddev
*mddev
)
595 if (mddev
->to_remove
) {
596 /* These cannot be removed under reconfig_mutex as
597 * an access to the files will try to take reconfig_mutex
598 * while holding the file unremovable, which leads to
600 * So hold set sysfs_active while the remove in happeing,
601 * and anything else which might set ->to_remove or my
602 * otherwise change the sysfs namespace will fail with
603 * -EBUSY if sysfs_active is still set.
604 * We set sysfs_active under reconfig_mutex and elsewhere
605 * test it under the same mutex to ensure its correct value
608 struct attribute_group
*to_remove
= mddev
->to_remove
;
609 mddev
->to_remove
= NULL
;
610 mddev
->sysfs_active
= 1;
611 mutex_unlock(&mddev
->reconfig_mutex
);
613 if (mddev
->kobj
.sd
) {
614 if (to_remove
!= &md_redundancy_group
)
615 sysfs_remove_group(&mddev
->kobj
, to_remove
);
616 if (mddev
->pers
== NULL
||
617 mddev
->pers
->sync_request
== NULL
) {
618 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
619 if (mddev
->sysfs_action
)
620 sysfs_put(mddev
->sysfs_action
);
621 mddev
->sysfs_action
= NULL
;
624 mddev
->sysfs_active
= 0;
626 mutex_unlock(&mddev
->reconfig_mutex
);
628 /* As we've dropped the mutex we need a spinlock to
629 * make sure the thread doesn't disappear
631 spin_lock(&pers_lock
);
632 md_wakeup_thread(mddev
->thread
);
633 spin_unlock(&pers_lock
);
635 EXPORT_SYMBOL_GPL(mddev_unlock
);
637 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
639 struct md_rdev
*rdev
;
641 rdev_for_each_rcu(rdev
, mddev
)
642 if (rdev
->desc_nr
== nr
)
647 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
649 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
651 struct md_rdev
*rdev
;
653 rdev_for_each(rdev
, mddev
)
654 if (rdev
->bdev
->bd_dev
== dev
)
660 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
662 struct md_rdev
*rdev
;
664 rdev_for_each_rcu(rdev
, mddev
)
665 if (rdev
->bdev
->bd_dev
== dev
)
671 static struct md_personality
*find_pers(int level
, char *clevel
)
673 struct md_personality
*pers
;
674 list_for_each_entry(pers
, &pers_list
, list
) {
675 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
677 if (strcmp(pers
->name
, clevel
)==0)
683 /* return the offset of the super block in 512byte sectors */
684 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
686 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
687 return MD_NEW_SIZE_SECTORS(num_sectors
);
690 static int alloc_disk_sb(struct md_rdev
*rdev
)
692 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
693 if (!rdev
->sb_page
) {
694 printk(KERN_ALERT
"md: out of memory.\n");
701 void md_rdev_clear(struct md_rdev
*rdev
)
704 put_page(rdev
->sb_page
);
706 rdev
->sb_page
= NULL
;
711 put_page(rdev
->bb_page
);
712 rdev
->bb_page
= NULL
;
714 badblocks_exit(&rdev
->badblocks
);
716 EXPORT_SYMBOL_GPL(md_rdev_clear
);
718 static void super_written(struct bio
*bio
)
720 struct md_rdev
*rdev
= bio
->bi_private
;
721 struct mddev
*mddev
= rdev
->mddev
;
724 printk("md: super_written gets error=%d\n", bio
->bi_error
);
725 md_error(mddev
, rdev
);
728 if (atomic_dec_and_test(&mddev
->pending_writes
))
729 wake_up(&mddev
->sb_wait
);
733 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
734 sector_t sector
, int size
, struct page
*page
)
736 /* write first size bytes of page to sector of rdev
737 * Increment mddev->pending_writes before returning
738 * and decrement it on completion, waking up sb_wait
739 * if zero is reached.
740 * If an error occurred, call md_error
742 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
744 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
745 bio
->bi_iter
.bi_sector
= sector
;
746 bio_add_page(bio
, page
, size
, 0);
747 bio
->bi_private
= rdev
;
748 bio
->bi_end_io
= super_written
;
750 atomic_inc(&mddev
->pending_writes
);
751 submit_bio(WRITE_FLUSH_FUA
, bio
);
754 void md_super_wait(struct mddev
*mddev
)
756 /* wait for all superblock writes that were scheduled to complete */
757 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
760 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
761 struct page
*page
, int rw
, bool metadata_op
)
763 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
766 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
767 rdev
->meta_bdev
: rdev
->bdev
;
769 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
770 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
771 (rdev
->mddev
->reshape_backwards
==
772 (sector
>= rdev
->mddev
->reshape_position
)))
773 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
775 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
776 bio_add_page(bio
, page
, size
, 0);
777 submit_bio_wait(rw
, bio
);
779 ret
= !bio
->bi_error
;
783 EXPORT_SYMBOL_GPL(sync_page_io
);
785 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
787 char b
[BDEVNAME_SIZE
];
792 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
798 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
799 bdevname(rdev
->bdev
,b
));
803 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
805 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
806 sb1
->set_uuid1
== sb2
->set_uuid1
&&
807 sb1
->set_uuid2
== sb2
->set_uuid2
&&
808 sb1
->set_uuid3
== sb2
->set_uuid3
;
811 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
814 mdp_super_t
*tmp1
, *tmp2
;
816 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
817 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
819 if (!tmp1
|| !tmp2
) {
821 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
829 * nr_disks is not constant
834 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
841 static u32
md_csum_fold(u32 csum
)
843 csum
= (csum
& 0xffff) + (csum
>> 16);
844 return (csum
& 0xffff) + (csum
>> 16);
847 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
850 u32
*sb32
= (u32
*)sb
;
852 unsigned int disk_csum
, csum
;
854 disk_csum
= sb
->sb_csum
;
857 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
859 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
862 /* This used to use csum_partial, which was wrong for several
863 * reasons including that different results are returned on
864 * different architectures. It isn't critical that we get exactly
865 * the same return value as before (we always csum_fold before
866 * testing, and that removes any differences). However as we
867 * know that csum_partial always returned a 16bit value on
868 * alphas, do a fold to maximise conformity to previous behaviour.
870 sb
->sb_csum
= md_csum_fold(disk_csum
);
872 sb
->sb_csum
= disk_csum
;
878 * Handle superblock details.
879 * We want to be able to handle multiple superblock formats
880 * so we have a common interface to them all, and an array of
881 * different handlers.
882 * We rely on user-space to write the initial superblock, and support
883 * reading and updating of superblocks.
884 * Interface methods are:
885 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
886 * loads and validates a superblock on dev.
887 * if refdev != NULL, compare superblocks on both devices
889 * 0 - dev has a superblock that is compatible with refdev
890 * 1 - dev has a superblock that is compatible and newer than refdev
891 * so dev should be used as the refdev in future
892 * -EINVAL superblock incompatible or invalid
893 * -othererror e.g. -EIO
895 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
896 * Verify that dev is acceptable into mddev.
897 * The first time, mddev->raid_disks will be 0, and data from
898 * dev should be merged in. Subsequent calls check that dev
899 * is new enough. Return 0 or -EINVAL
901 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
902 * Update the superblock for rdev with data in mddev
903 * This does not write to disc.
909 struct module
*owner
;
910 int (*load_super
)(struct md_rdev
*rdev
,
911 struct md_rdev
*refdev
,
913 int (*validate_super
)(struct mddev
*mddev
,
914 struct md_rdev
*rdev
);
915 void (*sync_super
)(struct mddev
*mddev
,
916 struct md_rdev
*rdev
);
917 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
918 sector_t num_sectors
);
919 int (*allow_new_offset
)(struct md_rdev
*rdev
,
920 unsigned long long new_offset
);
924 * Check that the given mddev has no bitmap.
926 * This function is called from the run method of all personalities that do not
927 * support bitmaps. It prints an error message and returns non-zero if mddev
928 * has a bitmap. Otherwise, it returns 0.
931 int md_check_no_bitmap(struct mddev
*mddev
)
933 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
935 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
936 mdname(mddev
), mddev
->pers
->name
);
939 EXPORT_SYMBOL(md_check_no_bitmap
);
942 * load_super for 0.90.0
944 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
946 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
951 * Calculate the position of the superblock (512byte sectors),
952 * it's at the end of the disk.
954 * It also happens to be a multiple of 4Kb.
956 rdev
->sb_start
= calc_dev_sboffset(rdev
);
958 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
963 bdevname(rdev
->bdev
, b
);
964 sb
= page_address(rdev
->sb_page
);
966 if (sb
->md_magic
!= MD_SB_MAGIC
) {
967 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
972 if (sb
->major_version
!= 0 ||
973 sb
->minor_version
< 90 ||
974 sb
->minor_version
> 91) {
975 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
976 sb
->major_version
, sb
->minor_version
,
981 if (sb
->raid_disks
<= 0)
984 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
985 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
990 rdev
->preferred_minor
= sb
->md_minor
;
991 rdev
->data_offset
= 0;
992 rdev
->new_data_offset
= 0;
993 rdev
->sb_size
= MD_SB_BYTES
;
994 rdev
->badblocks
.shift
= -1;
996 if (sb
->level
== LEVEL_MULTIPATH
)
999 rdev
->desc_nr
= sb
->this_disk
.number
;
1005 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1006 if (!uuid_equal(refsb
, sb
)) {
1007 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1008 b
, bdevname(refdev
->bdev
,b2
));
1011 if (!sb_equal(refsb
, sb
)) {
1012 printk(KERN_WARNING
"md: %s has same UUID"
1013 " but different superblock to %s\n",
1014 b
, bdevname(refdev
->bdev
, b2
));
1018 ev2
= md_event(refsb
);
1024 rdev
->sectors
= rdev
->sb_start
;
1025 /* Limit to 4TB as metadata cannot record more than that.
1026 * (not needed for Linear and RAID0 as metadata doesn't
1029 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1030 rdev
->sectors
= (2ULL << 32) - 2;
1032 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1033 /* "this cannot possibly happen" ... */
1041 * validate_super for 0.90.0
1043 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1046 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1047 __u64 ev1
= md_event(sb
);
1049 rdev
->raid_disk
= -1;
1050 clear_bit(Faulty
, &rdev
->flags
);
1051 clear_bit(In_sync
, &rdev
->flags
);
1052 clear_bit(Bitmap_sync
, &rdev
->flags
);
1053 clear_bit(WriteMostly
, &rdev
->flags
);
1055 if (mddev
->raid_disks
== 0) {
1056 mddev
->major_version
= 0;
1057 mddev
->minor_version
= sb
->minor_version
;
1058 mddev
->patch_version
= sb
->patch_version
;
1059 mddev
->external
= 0;
1060 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1061 mddev
->ctime
= sb
->ctime
;
1062 mddev
->utime
= sb
->utime
;
1063 mddev
->level
= sb
->level
;
1064 mddev
->clevel
[0] = 0;
1065 mddev
->layout
= sb
->layout
;
1066 mddev
->raid_disks
= sb
->raid_disks
;
1067 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1068 mddev
->events
= ev1
;
1069 mddev
->bitmap_info
.offset
= 0;
1070 mddev
->bitmap_info
.space
= 0;
1071 /* bitmap can use 60 K after the 4K superblocks */
1072 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1073 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1074 mddev
->reshape_backwards
= 0;
1076 if (mddev
->minor_version
>= 91) {
1077 mddev
->reshape_position
= sb
->reshape_position
;
1078 mddev
->delta_disks
= sb
->delta_disks
;
1079 mddev
->new_level
= sb
->new_level
;
1080 mddev
->new_layout
= sb
->new_layout
;
1081 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1082 if (mddev
->delta_disks
< 0)
1083 mddev
->reshape_backwards
= 1;
1085 mddev
->reshape_position
= MaxSector
;
1086 mddev
->delta_disks
= 0;
1087 mddev
->new_level
= mddev
->level
;
1088 mddev
->new_layout
= mddev
->layout
;
1089 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1092 if (sb
->state
& (1<<MD_SB_CLEAN
))
1093 mddev
->recovery_cp
= MaxSector
;
1095 if (sb
->events_hi
== sb
->cp_events_hi
&&
1096 sb
->events_lo
== sb
->cp_events_lo
) {
1097 mddev
->recovery_cp
= sb
->recovery_cp
;
1099 mddev
->recovery_cp
= 0;
1102 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1103 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1104 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1105 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1107 mddev
->max_disks
= MD_SB_DISKS
;
1109 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1110 mddev
->bitmap_info
.file
== NULL
) {
1111 mddev
->bitmap_info
.offset
=
1112 mddev
->bitmap_info
.default_offset
;
1113 mddev
->bitmap_info
.space
=
1114 mddev
->bitmap_info
.default_space
;
1117 } else if (mddev
->pers
== NULL
) {
1118 /* Insist on good event counter while assembling, except
1119 * for spares (which don't need an event count) */
1121 if (sb
->disks
[rdev
->desc_nr
].state
& (
1122 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1123 if (ev1
< mddev
->events
)
1125 } else if (mddev
->bitmap
) {
1126 /* if adding to array with a bitmap, then we can accept an
1127 * older device ... but not too old.
1129 if (ev1
< mddev
->bitmap
->events_cleared
)
1131 if (ev1
< mddev
->events
)
1132 set_bit(Bitmap_sync
, &rdev
->flags
);
1134 if (ev1
< mddev
->events
)
1135 /* just a hot-add of a new device, leave raid_disk at -1 */
1139 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1140 desc
= sb
->disks
+ rdev
->desc_nr
;
1142 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1143 set_bit(Faulty
, &rdev
->flags
);
1144 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1145 desc->raid_disk < mddev->raid_disks */) {
1146 set_bit(In_sync
, &rdev
->flags
);
1147 rdev
->raid_disk
= desc
->raid_disk
;
1148 rdev
->saved_raid_disk
= desc
->raid_disk
;
1149 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1150 /* active but not in sync implies recovery up to
1151 * reshape position. We don't know exactly where
1152 * that is, so set to zero for now */
1153 if (mddev
->minor_version
>= 91) {
1154 rdev
->recovery_offset
= 0;
1155 rdev
->raid_disk
= desc
->raid_disk
;
1158 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1159 set_bit(WriteMostly
, &rdev
->flags
);
1160 } else /* MULTIPATH are always insync */
1161 set_bit(In_sync
, &rdev
->flags
);
1166 * sync_super for 0.90.0
1168 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1171 struct md_rdev
*rdev2
;
1172 int next_spare
= mddev
->raid_disks
;
1174 /* make rdev->sb match mddev data..
1177 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1178 * 3/ any empty disks < next_spare become removed
1180 * disks[0] gets initialised to REMOVED because
1181 * we cannot be sure from other fields if it has
1182 * been initialised or not.
1185 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1187 rdev
->sb_size
= MD_SB_BYTES
;
1189 sb
= page_address(rdev
->sb_page
);
1191 memset(sb
, 0, sizeof(*sb
));
1193 sb
->md_magic
= MD_SB_MAGIC
;
1194 sb
->major_version
= mddev
->major_version
;
1195 sb
->patch_version
= mddev
->patch_version
;
1196 sb
->gvalid_words
= 0; /* ignored */
1197 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1198 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1199 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1200 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1202 sb
->ctime
= mddev
->ctime
;
1203 sb
->level
= mddev
->level
;
1204 sb
->size
= mddev
->dev_sectors
/ 2;
1205 sb
->raid_disks
= mddev
->raid_disks
;
1206 sb
->md_minor
= mddev
->md_minor
;
1207 sb
->not_persistent
= 0;
1208 sb
->utime
= mddev
->utime
;
1210 sb
->events_hi
= (mddev
->events
>>32);
1211 sb
->events_lo
= (u32
)mddev
->events
;
1213 if (mddev
->reshape_position
== MaxSector
)
1214 sb
->minor_version
= 90;
1216 sb
->minor_version
= 91;
1217 sb
->reshape_position
= mddev
->reshape_position
;
1218 sb
->new_level
= mddev
->new_level
;
1219 sb
->delta_disks
= mddev
->delta_disks
;
1220 sb
->new_layout
= mddev
->new_layout
;
1221 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1223 mddev
->minor_version
= sb
->minor_version
;
1226 sb
->recovery_cp
= mddev
->recovery_cp
;
1227 sb
->cp_events_hi
= (mddev
->events
>>32);
1228 sb
->cp_events_lo
= (u32
)mddev
->events
;
1229 if (mddev
->recovery_cp
== MaxSector
)
1230 sb
->state
= (1<< MD_SB_CLEAN
);
1232 sb
->recovery_cp
= 0;
1234 sb
->layout
= mddev
->layout
;
1235 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1237 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1238 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1240 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1241 rdev_for_each(rdev2
, mddev
) {
1244 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1246 if (rdev2
->raid_disk
>= 0 &&
1247 sb
->minor_version
>= 91)
1248 /* we have nowhere to store the recovery_offset,
1249 * but if it is not below the reshape_position,
1250 * we can piggy-back on that.
1253 if (rdev2
->raid_disk
< 0 ||
1254 test_bit(Faulty
, &rdev2
->flags
))
1257 desc_nr
= rdev2
->raid_disk
;
1259 desc_nr
= next_spare
++;
1260 rdev2
->desc_nr
= desc_nr
;
1261 d
= &sb
->disks
[rdev2
->desc_nr
];
1263 d
->number
= rdev2
->desc_nr
;
1264 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1265 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1267 d
->raid_disk
= rdev2
->raid_disk
;
1269 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1270 if (test_bit(Faulty
, &rdev2
->flags
))
1271 d
->state
= (1<<MD_DISK_FAULTY
);
1272 else if (is_active
) {
1273 d
->state
= (1<<MD_DISK_ACTIVE
);
1274 if (test_bit(In_sync
, &rdev2
->flags
))
1275 d
->state
|= (1<<MD_DISK_SYNC
);
1283 if (test_bit(WriteMostly
, &rdev2
->flags
))
1284 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1286 /* now set the "removed" and "faulty" bits on any missing devices */
1287 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1288 mdp_disk_t
*d
= &sb
->disks
[i
];
1289 if (d
->state
== 0 && d
->number
== 0) {
1292 d
->state
= (1<<MD_DISK_REMOVED
);
1293 d
->state
|= (1<<MD_DISK_FAULTY
);
1297 sb
->nr_disks
= nr_disks
;
1298 sb
->active_disks
= active
;
1299 sb
->working_disks
= working
;
1300 sb
->failed_disks
= failed
;
1301 sb
->spare_disks
= spare
;
1303 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1304 sb
->sb_csum
= calc_sb_csum(sb
);
1308 * rdev_size_change for 0.90.0
1310 static unsigned long long
1311 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1313 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1314 return 0; /* component must fit device */
1315 if (rdev
->mddev
->bitmap_info
.offset
)
1316 return 0; /* can't move bitmap */
1317 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1318 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1319 num_sectors
= rdev
->sb_start
;
1320 /* Limit to 4TB as metadata cannot record more than that.
1321 * 4TB == 2^32 KB, or 2*2^32 sectors.
1323 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1324 num_sectors
= (2ULL << 32) - 2;
1325 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1327 md_super_wait(rdev
->mddev
);
1332 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1334 /* non-zero offset changes not possible with v0.90 */
1335 return new_offset
== 0;
1339 * version 1 superblock
1342 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1346 unsigned long long newcsum
;
1347 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1348 __le32
*isuper
= (__le32
*)sb
;
1350 disk_csum
= sb
->sb_csum
;
1353 for (; size
>= 4; size
-= 4)
1354 newcsum
+= le32_to_cpu(*isuper
++);
1357 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1359 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1360 sb
->sb_csum
= disk_csum
;
1361 return cpu_to_le32(csum
);
1364 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1366 struct mdp_superblock_1
*sb
;
1370 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1374 * Calculate the position of the superblock in 512byte sectors.
1375 * It is always aligned to a 4K boundary and
1376 * depeding on minor_version, it can be:
1377 * 0: At least 8K, but less than 12K, from end of device
1378 * 1: At start of device
1379 * 2: 4K from start of device.
1381 switch(minor_version
) {
1383 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1385 sb_start
&= ~(sector_t
)(4*2-1);
1396 rdev
->sb_start
= sb_start
;
1398 /* superblock is rarely larger than 1K, but it can be larger,
1399 * and it is safe to read 4k, so we do that
1401 ret
= read_disk_sb(rdev
, 4096);
1402 if (ret
) return ret
;
1404 sb
= page_address(rdev
->sb_page
);
1406 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1407 sb
->major_version
!= cpu_to_le32(1) ||
1408 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1409 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1410 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1413 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1414 printk("md: invalid superblock checksum on %s\n",
1415 bdevname(rdev
->bdev
,b
));
1418 if (le64_to_cpu(sb
->data_size
) < 10) {
1419 printk("md: data_size too small on %s\n",
1420 bdevname(rdev
->bdev
,b
));
1425 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1426 /* Some padding is non-zero, might be a new feature */
1429 rdev
->preferred_minor
= 0xffff;
1430 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1431 rdev
->new_data_offset
= rdev
->data_offset
;
1432 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1433 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1434 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1435 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1437 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1438 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1439 if (rdev
->sb_size
& bmask
)
1440 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1443 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1446 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1449 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1452 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1454 if (!rdev
->bb_page
) {
1455 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1459 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1460 rdev
->badblocks
.count
== 0) {
1461 /* need to load the bad block list.
1462 * Currently we limit it to one page.
1468 int sectors
= le16_to_cpu(sb
->bblog_size
);
1469 if (sectors
> (PAGE_SIZE
/ 512))
1471 offset
= le32_to_cpu(sb
->bblog_offset
);
1474 bb_sector
= (long long)offset
;
1475 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1476 rdev
->bb_page
, READ
, true))
1478 bbp
= (u64
*)page_address(rdev
->bb_page
);
1479 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1480 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1481 u64 bb
= le64_to_cpu(*bbp
);
1482 int count
= bb
& (0x3ff);
1483 u64 sector
= bb
>> 10;
1484 sector
<<= sb
->bblog_shift
;
1485 count
<<= sb
->bblog_shift
;
1488 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1491 } else if (sb
->bblog_offset
!= 0)
1492 rdev
->badblocks
.shift
= 0;
1498 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1500 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1501 sb
->level
!= refsb
->level
||
1502 sb
->layout
!= refsb
->layout
||
1503 sb
->chunksize
!= refsb
->chunksize
) {
1504 printk(KERN_WARNING
"md: %s has strangely different"
1505 " superblock to %s\n",
1506 bdevname(rdev
->bdev
,b
),
1507 bdevname(refdev
->bdev
,b2
));
1510 ev1
= le64_to_cpu(sb
->events
);
1511 ev2
= le64_to_cpu(refsb
->events
);
1518 if (minor_version
) {
1519 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1520 sectors
-= rdev
->data_offset
;
1522 sectors
= rdev
->sb_start
;
1523 if (sectors
< le64_to_cpu(sb
->data_size
))
1525 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1529 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1531 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1532 __u64 ev1
= le64_to_cpu(sb
->events
);
1534 rdev
->raid_disk
= -1;
1535 clear_bit(Faulty
, &rdev
->flags
);
1536 clear_bit(In_sync
, &rdev
->flags
);
1537 clear_bit(Bitmap_sync
, &rdev
->flags
);
1538 clear_bit(WriteMostly
, &rdev
->flags
);
1540 if (mddev
->raid_disks
== 0) {
1541 mddev
->major_version
= 1;
1542 mddev
->patch_version
= 0;
1543 mddev
->external
= 0;
1544 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1545 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1546 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1547 mddev
->level
= le32_to_cpu(sb
->level
);
1548 mddev
->clevel
[0] = 0;
1549 mddev
->layout
= le32_to_cpu(sb
->layout
);
1550 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1551 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1552 mddev
->events
= ev1
;
1553 mddev
->bitmap_info
.offset
= 0;
1554 mddev
->bitmap_info
.space
= 0;
1555 /* Default location for bitmap is 1K after superblock
1556 * using 3K - total of 4K
1558 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1559 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1560 mddev
->reshape_backwards
= 0;
1562 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1563 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1565 mddev
->max_disks
= (4096-256)/2;
1567 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1568 mddev
->bitmap_info
.file
== NULL
) {
1569 mddev
->bitmap_info
.offset
=
1570 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1571 /* Metadata doesn't record how much space is available.
1572 * For 1.0, we assume we can use up to the superblock
1573 * if before, else to 4K beyond superblock.
1574 * For others, assume no change is possible.
1576 if (mddev
->minor_version
> 0)
1577 mddev
->bitmap_info
.space
= 0;
1578 else if (mddev
->bitmap_info
.offset
> 0)
1579 mddev
->bitmap_info
.space
=
1580 8 - mddev
->bitmap_info
.offset
;
1582 mddev
->bitmap_info
.space
=
1583 -mddev
->bitmap_info
.offset
;
1586 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1587 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1588 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1589 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1590 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1591 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1592 if (mddev
->delta_disks
< 0 ||
1593 (mddev
->delta_disks
== 0 &&
1594 (le32_to_cpu(sb
->feature_map
)
1595 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1596 mddev
->reshape_backwards
= 1;
1598 mddev
->reshape_position
= MaxSector
;
1599 mddev
->delta_disks
= 0;
1600 mddev
->new_level
= mddev
->level
;
1601 mddev
->new_layout
= mddev
->layout
;
1602 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1605 } else if (mddev
->pers
== NULL
) {
1606 /* Insist of good event counter while assembling, except for
1607 * spares (which don't need an event count) */
1609 if (rdev
->desc_nr
>= 0 &&
1610 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1611 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1612 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1613 if (ev1
< mddev
->events
)
1615 } else if (mddev
->bitmap
) {
1616 /* If adding to array with a bitmap, then we can accept an
1617 * older device, but not too old.
1619 if (ev1
< mddev
->bitmap
->events_cleared
)
1621 if (ev1
< mddev
->events
)
1622 set_bit(Bitmap_sync
, &rdev
->flags
);
1624 if (ev1
< mddev
->events
)
1625 /* just a hot-add of a new device, leave raid_disk at -1 */
1628 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1630 if (rdev
->desc_nr
< 0 ||
1631 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1632 role
= MD_DISK_ROLE_SPARE
;
1635 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1637 case MD_DISK_ROLE_SPARE
: /* spare */
1639 case MD_DISK_ROLE_FAULTY
: /* faulty */
1640 set_bit(Faulty
, &rdev
->flags
);
1642 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1643 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1644 /* journal device without journal feature */
1646 "md: journal device provided without journal feature, ignoring the device\n");
1649 set_bit(Journal
, &rdev
->flags
);
1650 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1651 if (mddev
->recovery_cp
== MaxSector
)
1652 set_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
);
1653 rdev
->raid_disk
= 0;
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 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)
1673 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1674 } else /* MULTIPATH are always insync */
1675 set_bit(In_sync
, &rdev
->flags
);
1680 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1682 struct mdp_superblock_1
*sb
;
1683 struct md_rdev
*rdev2
;
1685 /* make rdev->sb match mddev and rdev data. */
1687 sb
= page_address(rdev
->sb_page
);
1689 sb
->feature_map
= 0;
1691 sb
->recovery_offset
= cpu_to_le64(0);
1692 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1694 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1695 sb
->events
= cpu_to_le64(mddev
->events
);
1697 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1698 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1699 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1701 sb
->resync_offset
= cpu_to_le64(0);
1703 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1705 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1706 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1707 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1708 sb
->level
= cpu_to_le32(mddev
->level
);
1709 sb
->layout
= cpu_to_le32(mddev
->layout
);
1711 if (test_bit(WriteMostly
, &rdev
->flags
))
1712 sb
->devflags
|= WriteMostly1
;
1714 sb
->devflags
&= ~WriteMostly1
;
1715 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1716 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1718 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1719 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1720 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1723 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1724 !test_bit(In_sync
, &rdev
->flags
)) {
1726 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1727 sb
->recovery_offset
=
1728 cpu_to_le64(rdev
->recovery_offset
);
1729 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1731 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1733 /* Note: recovery_offset and journal_tail share space */
1734 if (test_bit(Journal
, &rdev
->flags
))
1735 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1736 if (test_bit(Replacement
, &rdev
->flags
))
1738 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1740 if (mddev
->reshape_position
!= MaxSector
) {
1741 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1742 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1743 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1744 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1745 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1746 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1747 if (mddev
->delta_disks
== 0 &&
1748 mddev
->reshape_backwards
)
1750 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1751 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1753 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1754 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1755 - rdev
->data_offset
));
1759 if (mddev_is_clustered(mddev
))
1760 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1762 if (rdev
->badblocks
.count
== 0)
1763 /* Nothing to do for bad blocks*/ ;
1764 else if (sb
->bblog_offset
== 0)
1765 /* Cannot record bad blocks on this device */
1766 md_error(mddev
, rdev
);
1768 struct badblocks
*bb
= &rdev
->badblocks
;
1769 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1771 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1776 seq
= read_seqbegin(&bb
->lock
);
1778 memset(bbp
, 0xff, PAGE_SIZE
);
1780 for (i
= 0 ; i
< bb
->count
; i
++) {
1781 u64 internal_bb
= p
[i
];
1782 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1783 | BB_LEN(internal_bb
));
1784 bbp
[i
] = cpu_to_le64(store_bb
);
1787 if (read_seqretry(&bb
->lock
, seq
))
1790 bb
->sector
= (rdev
->sb_start
+
1791 (int)le32_to_cpu(sb
->bblog_offset
));
1792 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1797 rdev_for_each(rdev2
, mddev
)
1798 if (rdev2
->desc_nr
+1 > max_dev
)
1799 max_dev
= rdev2
->desc_nr
+1;
1801 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1803 sb
->max_dev
= cpu_to_le32(max_dev
);
1804 rdev
->sb_size
= max_dev
* 2 + 256;
1805 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1806 if (rdev
->sb_size
& bmask
)
1807 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1809 max_dev
= le32_to_cpu(sb
->max_dev
);
1811 for (i
=0; i
<max_dev
;i
++)
1812 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1814 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1815 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1817 rdev_for_each(rdev2
, mddev
) {
1819 if (test_bit(Faulty
, &rdev2
->flags
))
1820 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1821 else if (test_bit(In_sync
, &rdev2
->flags
))
1822 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1823 else if (test_bit(Journal
, &rdev2
->flags
))
1824 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1825 else if (rdev2
->raid_disk
>= 0)
1826 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1828 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1831 sb
->sb_csum
= calc_sb_1_csum(sb
);
1834 static unsigned long long
1835 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1837 struct mdp_superblock_1
*sb
;
1838 sector_t max_sectors
;
1839 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1840 return 0; /* component must fit device */
1841 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1842 return 0; /* too confusing */
1843 if (rdev
->sb_start
< rdev
->data_offset
) {
1844 /* minor versions 1 and 2; superblock before data */
1845 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1846 max_sectors
-= rdev
->data_offset
;
1847 if (!num_sectors
|| num_sectors
> max_sectors
)
1848 num_sectors
= max_sectors
;
1849 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1850 /* minor version 0 with bitmap we can't move */
1853 /* minor version 0; superblock after data */
1855 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1856 sb_start
&= ~(sector_t
)(4*2 - 1);
1857 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1858 if (!num_sectors
|| num_sectors
> max_sectors
)
1859 num_sectors
= max_sectors
;
1860 rdev
->sb_start
= sb_start
;
1862 sb
= page_address(rdev
->sb_page
);
1863 sb
->data_size
= cpu_to_le64(num_sectors
);
1864 sb
->super_offset
= rdev
->sb_start
;
1865 sb
->sb_csum
= calc_sb_1_csum(sb
);
1866 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1868 md_super_wait(rdev
->mddev
);
1874 super_1_allow_new_offset(struct md_rdev
*rdev
,
1875 unsigned long long new_offset
)
1877 /* All necessary checks on new >= old have been done */
1878 struct bitmap
*bitmap
;
1879 if (new_offset
>= rdev
->data_offset
)
1882 /* with 1.0 metadata, there is no metadata to tread on
1883 * so we can always move back */
1884 if (rdev
->mddev
->minor_version
== 0)
1887 /* otherwise we must be sure not to step on
1888 * any metadata, so stay:
1889 * 36K beyond start of superblock
1890 * beyond end of badblocks
1891 * beyond write-intent bitmap
1893 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1895 bitmap
= rdev
->mddev
->bitmap
;
1896 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1897 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1898 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1900 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1906 static struct super_type super_types
[] = {
1909 .owner
= THIS_MODULE
,
1910 .load_super
= super_90_load
,
1911 .validate_super
= super_90_validate
,
1912 .sync_super
= super_90_sync
,
1913 .rdev_size_change
= super_90_rdev_size_change
,
1914 .allow_new_offset
= super_90_allow_new_offset
,
1918 .owner
= THIS_MODULE
,
1919 .load_super
= super_1_load
,
1920 .validate_super
= super_1_validate
,
1921 .sync_super
= super_1_sync
,
1922 .rdev_size_change
= super_1_rdev_size_change
,
1923 .allow_new_offset
= super_1_allow_new_offset
,
1927 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1929 if (mddev
->sync_super
) {
1930 mddev
->sync_super(mddev
, rdev
);
1934 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1936 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1939 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1941 struct md_rdev
*rdev
, *rdev2
;
1944 rdev_for_each_rcu(rdev
, mddev1
) {
1945 if (test_bit(Faulty
, &rdev
->flags
) ||
1946 test_bit(Journal
, &rdev
->flags
) ||
1947 rdev
->raid_disk
== -1)
1949 rdev_for_each_rcu(rdev2
, mddev2
) {
1950 if (test_bit(Faulty
, &rdev2
->flags
) ||
1951 test_bit(Journal
, &rdev2
->flags
) ||
1952 rdev2
->raid_disk
== -1)
1954 if (rdev
->bdev
->bd_contains
==
1955 rdev2
->bdev
->bd_contains
) {
1965 static LIST_HEAD(pending_raid_disks
);
1968 * Try to register data integrity profile for an mddev
1970 * This is called when an array is started and after a disk has been kicked
1971 * from the array. It only succeeds if all working and active component devices
1972 * are integrity capable with matching profiles.
1974 int md_integrity_register(struct mddev
*mddev
)
1976 struct md_rdev
*rdev
, *reference
= NULL
;
1978 if (list_empty(&mddev
->disks
))
1979 return 0; /* nothing to do */
1980 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1981 return 0; /* shouldn't register, or already is */
1982 rdev_for_each(rdev
, mddev
) {
1983 /* skip spares and non-functional disks */
1984 if (test_bit(Faulty
, &rdev
->flags
))
1986 if (rdev
->raid_disk
< 0)
1989 /* Use the first rdev as the reference */
1993 /* does this rdev's profile match the reference profile? */
1994 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1995 rdev
->bdev
->bd_disk
) < 0)
1998 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2001 * All component devices are integrity capable and have matching
2002 * profiles, register the common profile for the md device.
2004 blk_integrity_register(mddev
->gendisk
,
2005 bdev_get_integrity(reference
->bdev
));
2007 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2008 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2009 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2015 EXPORT_SYMBOL(md_integrity_register
);
2017 /* Disable data integrity if non-capable/non-matching disk is being added */
2018 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2020 struct blk_integrity
*bi_rdev
;
2021 struct blk_integrity
*bi_mddev
;
2023 if (!mddev
->gendisk
)
2026 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2027 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2029 if (!bi_mddev
) /* nothing to do */
2031 if (rdev
->raid_disk
< 0) /* skip spares */
2033 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2034 rdev
->bdev
->bd_disk
) >= 0)
2036 WARN_ON_ONCE(!mddev
->suspended
);
2037 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2038 blk_integrity_unregister(mddev
->gendisk
);
2040 EXPORT_SYMBOL(md_integrity_add_rdev
);
2042 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2044 char b
[BDEVNAME_SIZE
];
2048 /* prevent duplicates */
2049 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2052 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2053 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2054 rdev
->sectors
< mddev
->dev_sectors
)) {
2056 /* Cannot change size, so fail
2057 * If mddev->level <= 0, then we don't care
2058 * about aligning sizes (e.g. linear)
2060 if (mddev
->level
> 0)
2063 mddev
->dev_sectors
= rdev
->sectors
;
2066 /* Verify rdev->desc_nr is unique.
2067 * If it is -1, assign a free number, else
2068 * check number is not in use
2071 if (rdev
->desc_nr
< 0) {
2074 choice
= mddev
->raid_disks
;
2075 while (md_find_rdev_nr_rcu(mddev
, choice
))
2077 rdev
->desc_nr
= choice
;
2079 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2085 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2086 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2087 mdname(mddev
), mddev
->max_disks
);
2090 bdevname(rdev
->bdev
,b
);
2091 strreplace(b
, '/', '!');
2093 rdev
->mddev
= mddev
;
2094 printk(KERN_INFO
"md: bind<%s>\n", b
);
2096 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2099 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2100 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2101 /* failure here is OK */;
2102 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2104 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2105 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2107 /* May as well allow recovery to be retried once */
2108 mddev
->recovery_disabled
++;
2113 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2118 static void md_delayed_delete(struct work_struct
*ws
)
2120 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2121 kobject_del(&rdev
->kobj
);
2122 kobject_put(&rdev
->kobj
);
2125 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2127 char b
[BDEVNAME_SIZE
];
2129 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2130 list_del_rcu(&rdev
->same_set
);
2131 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2133 sysfs_remove_link(&rdev
->kobj
, "block");
2134 sysfs_put(rdev
->sysfs_state
);
2135 rdev
->sysfs_state
= NULL
;
2136 rdev
->badblocks
.count
= 0;
2137 /* We need to delay this, otherwise we can deadlock when
2138 * writing to 'remove' to "dev/state". We also need
2139 * to delay it due to rcu usage.
2142 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2143 kobject_get(&rdev
->kobj
);
2144 queue_work(md_misc_wq
, &rdev
->del_work
);
2148 * prevent the device from being mounted, repartitioned or
2149 * otherwise reused by a RAID array (or any other kernel
2150 * subsystem), by bd_claiming the device.
2152 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2155 struct block_device
*bdev
;
2156 char b
[BDEVNAME_SIZE
];
2158 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2159 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2161 printk(KERN_ERR
"md: could not open %s.\n",
2162 __bdevname(dev
, b
));
2163 return PTR_ERR(bdev
);
2169 static void unlock_rdev(struct md_rdev
*rdev
)
2171 struct block_device
*bdev
= rdev
->bdev
;
2173 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2176 void md_autodetect_dev(dev_t dev
);
2178 static void export_rdev(struct md_rdev
*rdev
)
2180 char b
[BDEVNAME_SIZE
];
2182 printk(KERN_INFO
"md: export_rdev(%s)\n",
2183 bdevname(rdev
->bdev
,b
));
2184 md_rdev_clear(rdev
);
2186 if (test_bit(AutoDetected
, &rdev
->flags
))
2187 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2190 kobject_put(&rdev
->kobj
);
2193 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2195 unbind_rdev_from_array(rdev
);
2198 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2200 static void export_array(struct mddev
*mddev
)
2202 struct md_rdev
*rdev
;
2204 while (!list_empty(&mddev
->disks
)) {
2205 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2207 md_kick_rdev_from_array(rdev
);
2209 mddev
->raid_disks
= 0;
2210 mddev
->major_version
= 0;
2213 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2215 /* Update each superblock (in-memory image), but
2216 * if we are allowed to, skip spares which already
2217 * have the right event counter, or have one earlier
2218 * (which would mean they aren't being marked as dirty
2219 * with the rest of the array)
2221 struct md_rdev
*rdev
;
2222 rdev_for_each(rdev
, mddev
) {
2223 if (rdev
->sb_events
== mddev
->events
||
2225 rdev
->raid_disk
< 0 &&
2226 rdev
->sb_events
+1 == mddev
->events
)) {
2227 /* Don't update this superblock */
2228 rdev
->sb_loaded
= 2;
2230 sync_super(mddev
, rdev
);
2231 rdev
->sb_loaded
= 1;
2236 static bool does_sb_need_changing(struct mddev
*mddev
)
2238 struct md_rdev
*rdev
;
2239 struct mdp_superblock_1
*sb
;
2242 /* Find a good rdev */
2243 rdev_for_each(rdev
, mddev
)
2244 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2247 /* No good device found. */
2251 sb
= page_address(rdev
->sb_page
);
2252 /* Check if a device has become faulty or a spare become active */
2253 rdev_for_each(rdev
, mddev
) {
2254 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2255 /* Device activated? */
2256 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2257 !test_bit(Faulty
, &rdev
->flags
))
2259 /* Device turned faulty? */
2260 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2264 /* Check if any mddev parameters have changed */
2265 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2266 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2267 (mddev
->layout
!= le64_to_cpu(sb
->layout
)) ||
2268 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2269 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2275 void md_update_sb(struct mddev
*mddev
, int force_change
)
2277 struct md_rdev
*rdev
;
2280 int any_badblocks_changed
= 0;
2285 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2289 if (mddev_is_clustered(mddev
)) {
2290 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2292 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2293 /* Has someone else has updated the sb */
2294 if (!does_sb_need_changing(mddev
)) {
2296 md_cluster_ops
->metadata_update_cancel(mddev
);
2297 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2302 /* First make sure individual recovery_offsets are correct */
2303 rdev_for_each(rdev
, mddev
) {
2304 if (rdev
->raid_disk
>= 0 &&
2305 mddev
->delta_disks
>= 0 &&
2306 !test_bit(Journal
, &rdev
->flags
) &&
2307 !test_bit(In_sync
, &rdev
->flags
) &&
2308 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2309 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2312 if (!mddev
->persistent
) {
2313 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2314 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2315 if (!mddev
->external
) {
2316 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2317 rdev_for_each(rdev
, mddev
) {
2318 if (rdev
->badblocks
.changed
) {
2319 rdev
->badblocks
.changed
= 0;
2320 ack_all_badblocks(&rdev
->badblocks
);
2321 md_error(mddev
, rdev
);
2323 clear_bit(Blocked
, &rdev
->flags
);
2324 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2325 wake_up(&rdev
->blocked_wait
);
2328 wake_up(&mddev
->sb_wait
);
2332 spin_lock(&mddev
->lock
);
2334 mddev
->utime
= get_seconds();
2336 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2338 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2339 /* just a clean<-> dirty transition, possibly leave spares alone,
2340 * though if events isn't the right even/odd, we will have to do
2346 if (mddev
->degraded
)
2347 /* If the array is degraded, then skipping spares is both
2348 * dangerous and fairly pointless.
2349 * Dangerous because a device that was removed from the array
2350 * might have a event_count that still looks up-to-date,
2351 * so it can be re-added without a resync.
2352 * Pointless because if there are any spares to skip,
2353 * then a recovery will happen and soon that array won't
2354 * be degraded any more and the spare can go back to sleep then.
2358 sync_req
= mddev
->in_sync
;
2360 /* If this is just a dirty<->clean transition, and the array is clean
2361 * and 'events' is odd, we can roll back to the previous clean state */
2363 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2364 && mddev
->can_decrease_events
2365 && mddev
->events
!= 1) {
2367 mddev
->can_decrease_events
= 0;
2369 /* otherwise we have to go forward and ... */
2371 mddev
->can_decrease_events
= nospares
;
2375 * This 64-bit counter should never wrap.
2376 * Either we are in around ~1 trillion A.C., assuming
2377 * 1 reboot per second, or we have a bug...
2379 WARN_ON(mddev
->events
== 0);
2381 rdev_for_each(rdev
, mddev
) {
2382 if (rdev
->badblocks
.changed
)
2383 any_badblocks_changed
++;
2384 if (test_bit(Faulty
, &rdev
->flags
))
2385 set_bit(FaultRecorded
, &rdev
->flags
);
2388 sync_sbs(mddev
, nospares
);
2389 spin_unlock(&mddev
->lock
);
2391 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2392 mdname(mddev
), mddev
->in_sync
);
2394 bitmap_update_sb(mddev
->bitmap
);
2395 rdev_for_each(rdev
, mddev
) {
2396 char b
[BDEVNAME_SIZE
];
2398 if (rdev
->sb_loaded
!= 1)
2399 continue; /* no noise on spare devices */
2401 if (!test_bit(Faulty
, &rdev
->flags
)) {
2402 md_super_write(mddev
,rdev
,
2403 rdev
->sb_start
, rdev
->sb_size
,
2405 pr_debug("md: (write) %s's sb offset: %llu\n",
2406 bdevname(rdev
->bdev
, b
),
2407 (unsigned long long)rdev
->sb_start
);
2408 rdev
->sb_events
= mddev
->events
;
2409 if (rdev
->badblocks
.size
) {
2410 md_super_write(mddev
, rdev
,
2411 rdev
->badblocks
.sector
,
2412 rdev
->badblocks
.size
<< 9,
2414 rdev
->badblocks
.size
= 0;
2418 pr_debug("md: %s (skipping faulty)\n",
2419 bdevname(rdev
->bdev
, b
));
2421 if (mddev
->level
== LEVEL_MULTIPATH
)
2422 /* only need to write one superblock... */
2425 md_super_wait(mddev
);
2426 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2428 spin_lock(&mddev
->lock
);
2429 if (mddev
->in_sync
!= sync_req
||
2430 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2431 /* have to write it out again */
2432 spin_unlock(&mddev
->lock
);
2435 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2436 spin_unlock(&mddev
->lock
);
2437 wake_up(&mddev
->sb_wait
);
2438 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2439 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2441 rdev_for_each(rdev
, mddev
) {
2442 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2443 clear_bit(Blocked
, &rdev
->flags
);
2445 if (any_badblocks_changed
)
2446 ack_all_badblocks(&rdev
->badblocks
);
2447 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2448 wake_up(&rdev
->blocked_wait
);
2451 if (mddev_is_clustered(mddev
) && ret
== 0)
2452 md_cluster_ops
->metadata_update_finish(mddev
);
2454 EXPORT_SYMBOL(md_update_sb
);
2456 static int add_bound_rdev(struct md_rdev
*rdev
)
2458 struct mddev
*mddev
= rdev
->mddev
;
2461 if (!mddev
->pers
->hot_remove_disk
) {
2462 /* If there is hot_add_disk but no hot_remove_disk
2463 * then added disks for geometry changes,
2464 * and should be added immediately.
2466 super_types
[mddev
->major_version
].
2467 validate_super(mddev
, rdev
);
2468 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2470 unbind_rdev_from_array(rdev
);
2475 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2477 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2478 if (mddev
->degraded
)
2479 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2480 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2481 md_new_event(mddev
);
2482 md_wakeup_thread(mddev
->thread
);
2486 /* words written to sysfs files may, or may not, be \n terminated.
2487 * We want to accept with case. For this we use cmd_match.
2489 static int cmd_match(const char *cmd
, const char *str
)
2491 /* See if cmd, written into a sysfs file, matches
2492 * str. They must either be the same, or cmd can
2493 * have a trailing newline
2495 while (*cmd
&& *str
&& *cmd
== *str
) {
2506 struct rdev_sysfs_entry
{
2507 struct attribute attr
;
2508 ssize_t (*show
)(struct md_rdev
*, char *);
2509 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2513 state_show(struct md_rdev
*rdev
, char *page
)
2517 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2519 if (test_bit(Faulty
, &flags
) ||
2520 rdev
->badblocks
.unacked_exist
) {
2521 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2524 if (test_bit(In_sync
, &flags
)) {
2525 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2528 if (test_bit(Journal
, &flags
)) {
2529 len
+= sprintf(page
+len
, "%sjournal",sep
);
2532 if (test_bit(WriteMostly
, &flags
)) {
2533 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2536 if (test_bit(Blocked
, &flags
) ||
2537 (rdev
->badblocks
.unacked_exist
2538 && !test_bit(Faulty
, &flags
))) {
2539 len
+= sprintf(page
+len
, "%sblocked", sep
);
2542 if (!test_bit(Faulty
, &flags
) &&
2543 !test_bit(Journal
, &flags
) &&
2544 !test_bit(In_sync
, &flags
)) {
2545 len
+= sprintf(page
+len
, "%sspare", sep
);
2548 if (test_bit(WriteErrorSeen
, &flags
)) {
2549 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2552 if (test_bit(WantReplacement
, &flags
)) {
2553 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2556 if (test_bit(Replacement
, &flags
)) {
2557 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2561 return len
+sprintf(page
+len
, "\n");
2565 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2568 * faulty - simulates an error
2569 * remove - disconnects the device
2570 * writemostly - sets write_mostly
2571 * -writemostly - clears write_mostly
2572 * blocked - sets the Blocked flags
2573 * -blocked - clears the Blocked and possibly simulates an error
2574 * insync - sets Insync providing device isn't active
2575 * -insync - clear Insync for a device with a slot assigned,
2576 * so that it gets rebuilt based on bitmap
2577 * write_error - sets WriteErrorSeen
2578 * -write_error - clears WriteErrorSeen
2581 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2582 md_error(rdev
->mddev
, rdev
);
2583 if (test_bit(Faulty
, &rdev
->flags
))
2587 } else if (cmd_match(buf
, "remove")) {
2588 if (rdev
->raid_disk
>= 0)
2591 struct mddev
*mddev
= rdev
->mddev
;
2593 if (mddev_is_clustered(mddev
))
2594 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2597 md_kick_rdev_from_array(rdev
);
2599 md_update_sb(mddev
, 1);
2600 md_new_event(mddev
);
2603 } else if (cmd_match(buf
, "writemostly")) {
2604 set_bit(WriteMostly
, &rdev
->flags
);
2606 } else if (cmd_match(buf
, "-writemostly")) {
2607 clear_bit(WriteMostly
, &rdev
->flags
);
2609 } else if (cmd_match(buf
, "blocked")) {
2610 set_bit(Blocked
, &rdev
->flags
);
2612 } else if (cmd_match(buf
, "-blocked")) {
2613 if (!test_bit(Faulty
, &rdev
->flags
) &&
2614 rdev
->badblocks
.unacked_exist
) {
2615 /* metadata handler doesn't understand badblocks,
2616 * so we need to fail the device
2618 md_error(rdev
->mddev
, rdev
);
2620 clear_bit(Blocked
, &rdev
->flags
);
2621 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2622 wake_up(&rdev
->blocked_wait
);
2623 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2624 md_wakeup_thread(rdev
->mddev
->thread
);
2627 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2628 set_bit(In_sync
, &rdev
->flags
);
2630 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2631 !test_bit(Journal
, &rdev
->flags
)) {
2632 if (rdev
->mddev
->pers
== NULL
) {
2633 clear_bit(In_sync
, &rdev
->flags
);
2634 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2635 rdev
->raid_disk
= -1;
2638 } else if (cmd_match(buf
, "write_error")) {
2639 set_bit(WriteErrorSeen
, &rdev
->flags
);
2641 } else if (cmd_match(buf
, "-write_error")) {
2642 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2644 } else if (cmd_match(buf
, "want_replacement")) {
2645 /* Any non-spare device that is not a replacement can
2646 * become want_replacement at any time, but we then need to
2647 * check if recovery is needed.
2649 if (rdev
->raid_disk
>= 0 &&
2650 !test_bit(Journal
, &rdev
->flags
) &&
2651 !test_bit(Replacement
, &rdev
->flags
))
2652 set_bit(WantReplacement
, &rdev
->flags
);
2653 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2654 md_wakeup_thread(rdev
->mddev
->thread
);
2656 } else if (cmd_match(buf
, "-want_replacement")) {
2657 /* Clearing 'want_replacement' is always allowed.
2658 * Once replacements starts it is too late though.
2661 clear_bit(WantReplacement
, &rdev
->flags
);
2662 } else if (cmd_match(buf
, "replacement")) {
2663 /* Can only set a device as a replacement when array has not
2664 * yet been started. Once running, replacement is automatic
2665 * from spares, or by assigning 'slot'.
2667 if (rdev
->mddev
->pers
)
2670 set_bit(Replacement
, &rdev
->flags
);
2673 } else if (cmd_match(buf
, "-replacement")) {
2674 /* Similarly, can only clear Replacement before start */
2675 if (rdev
->mddev
->pers
)
2678 clear_bit(Replacement
, &rdev
->flags
);
2681 } else if (cmd_match(buf
, "re-add")) {
2682 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2683 /* clear_bit is performed _after_ all the devices
2684 * have their local Faulty bit cleared. If any writes
2685 * happen in the meantime in the local node, they
2686 * will land in the local bitmap, which will be synced
2687 * by this node eventually
2689 if (!mddev_is_clustered(rdev
->mddev
) ||
2690 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2691 clear_bit(Faulty
, &rdev
->flags
);
2692 err
= add_bound_rdev(rdev
);
2698 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2699 return err
? err
: len
;
2701 static struct rdev_sysfs_entry rdev_state
=
2702 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2705 errors_show(struct md_rdev
*rdev
, char *page
)
2707 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2711 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2716 rv
= kstrtouint(buf
, 10, &n
);
2719 atomic_set(&rdev
->corrected_errors
, n
);
2722 static struct rdev_sysfs_entry rdev_errors
=
2723 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2726 slot_show(struct md_rdev
*rdev
, char *page
)
2728 if (test_bit(Journal
, &rdev
->flags
))
2729 return sprintf(page
, "journal\n");
2730 else if (rdev
->raid_disk
< 0)
2731 return sprintf(page
, "none\n");
2733 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2737 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2742 if (test_bit(Journal
, &rdev
->flags
))
2744 if (strncmp(buf
, "none", 4)==0)
2747 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2751 if (rdev
->mddev
->pers
&& slot
== -1) {
2752 /* Setting 'slot' on an active array requires also
2753 * updating the 'rd%d' link, and communicating
2754 * with the personality with ->hot_*_disk.
2755 * For now we only support removing
2756 * failed/spare devices. This normally happens automatically,
2757 * but not when the metadata is externally managed.
2759 if (rdev
->raid_disk
== -1)
2761 /* personality does all needed checks */
2762 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2764 clear_bit(Blocked
, &rdev
->flags
);
2765 remove_and_add_spares(rdev
->mddev
, rdev
);
2766 if (rdev
->raid_disk
>= 0)
2768 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2769 md_wakeup_thread(rdev
->mddev
->thread
);
2770 } else if (rdev
->mddev
->pers
) {
2771 /* Activating a spare .. or possibly reactivating
2772 * if we ever get bitmaps working here.
2776 if (rdev
->raid_disk
!= -1)
2779 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2782 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2785 if (slot
>= rdev
->mddev
->raid_disks
&&
2786 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2789 rdev
->raid_disk
= slot
;
2790 if (test_bit(In_sync
, &rdev
->flags
))
2791 rdev
->saved_raid_disk
= slot
;
2793 rdev
->saved_raid_disk
= -1;
2794 clear_bit(In_sync
, &rdev
->flags
);
2795 clear_bit(Bitmap_sync
, &rdev
->flags
);
2796 err
= rdev
->mddev
->pers
->
2797 hot_add_disk(rdev
->mddev
, rdev
);
2799 rdev
->raid_disk
= -1;
2802 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2803 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2804 /* failure here is OK */;
2805 /* don't wakeup anyone, leave that to userspace. */
2807 if (slot
>= rdev
->mddev
->raid_disks
&&
2808 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2810 rdev
->raid_disk
= slot
;
2811 /* assume it is working */
2812 clear_bit(Faulty
, &rdev
->flags
);
2813 clear_bit(WriteMostly
, &rdev
->flags
);
2814 set_bit(In_sync
, &rdev
->flags
);
2815 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2820 static struct rdev_sysfs_entry rdev_slot
=
2821 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2824 offset_show(struct md_rdev
*rdev
, char *page
)
2826 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2830 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2832 unsigned long long offset
;
2833 if (kstrtoull(buf
, 10, &offset
) < 0)
2835 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2837 if (rdev
->sectors
&& rdev
->mddev
->external
)
2838 /* Must set offset before size, so overlap checks
2841 rdev
->data_offset
= offset
;
2842 rdev
->new_data_offset
= offset
;
2846 static struct rdev_sysfs_entry rdev_offset
=
2847 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2849 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2851 return sprintf(page
, "%llu\n",
2852 (unsigned long long)rdev
->new_data_offset
);
2855 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2856 const char *buf
, size_t len
)
2858 unsigned long long new_offset
;
2859 struct mddev
*mddev
= rdev
->mddev
;
2861 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2864 if (mddev
->sync_thread
||
2865 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2867 if (new_offset
== rdev
->data_offset
)
2868 /* reset is always permitted */
2870 else if (new_offset
> rdev
->data_offset
) {
2871 /* must not push array size beyond rdev_sectors */
2872 if (new_offset
- rdev
->data_offset
2873 + mddev
->dev_sectors
> rdev
->sectors
)
2876 /* Metadata worries about other space details. */
2878 /* decreasing the offset is inconsistent with a backwards
2881 if (new_offset
< rdev
->data_offset
&&
2882 mddev
->reshape_backwards
)
2884 /* Increasing offset is inconsistent with forwards
2885 * reshape. reshape_direction should be set to
2886 * 'backwards' first.
2888 if (new_offset
> rdev
->data_offset
&&
2889 !mddev
->reshape_backwards
)
2892 if (mddev
->pers
&& mddev
->persistent
&&
2893 !super_types
[mddev
->major_version
]
2894 .allow_new_offset(rdev
, new_offset
))
2896 rdev
->new_data_offset
= new_offset
;
2897 if (new_offset
> rdev
->data_offset
)
2898 mddev
->reshape_backwards
= 1;
2899 else if (new_offset
< rdev
->data_offset
)
2900 mddev
->reshape_backwards
= 0;
2904 static struct rdev_sysfs_entry rdev_new_offset
=
2905 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2908 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2910 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2913 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2915 /* check if two start/length pairs overlap */
2923 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2925 unsigned long long blocks
;
2928 if (kstrtoull(buf
, 10, &blocks
) < 0)
2931 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2932 return -EINVAL
; /* sector conversion overflow */
2935 if (new != blocks
* 2)
2936 return -EINVAL
; /* unsigned long long to sector_t overflow */
2943 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2945 struct mddev
*my_mddev
= rdev
->mddev
;
2946 sector_t oldsectors
= rdev
->sectors
;
2949 if (test_bit(Journal
, &rdev
->flags
))
2951 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2953 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2954 return -EINVAL
; /* too confusing */
2955 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2956 if (my_mddev
->persistent
) {
2957 sectors
= super_types
[my_mddev
->major_version
].
2958 rdev_size_change(rdev
, sectors
);
2961 } else if (!sectors
)
2962 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2964 if (!my_mddev
->pers
->resize
)
2965 /* Cannot change size for RAID0 or Linear etc */
2968 if (sectors
< my_mddev
->dev_sectors
)
2969 return -EINVAL
; /* component must fit device */
2971 rdev
->sectors
= sectors
;
2972 if (sectors
> oldsectors
&& my_mddev
->external
) {
2973 /* Need to check that all other rdevs with the same
2974 * ->bdev do not overlap. 'rcu' is sufficient to walk
2975 * the rdev lists safely.
2976 * This check does not provide a hard guarantee, it
2977 * just helps avoid dangerous mistakes.
2979 struct mddev
*mddev
;
2981 struct list_head
*tmp
;
2984 for_each_mddev(mddev
, tmp
) {
2985 struct md_rdev
*rdev2
;
2987 rdev_for_each(rdev2
, mddev
)
2988 if (rdev
->bdev
== rdev2
->bdev
&&
2990 overlaps(rdev
->data_offset
, rdev
->sectors
,
3003 /* Someone else could have slipped in a size
3004 * change here, but doing so is just silly.
3005 * We put oldsectors back because we *know* it is
3006 * safe, and trust userspace not to race with
3009 rdev
->sectors
= oldsectors
;
3016 static struct rdev_sysfs_entry rdev_size
=
3017 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3019 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3021 unsigned long long recovery_start
= rdev
->recovery_offset
;
3023 if (test_bit(In_sync
, &rdev
->flags
) ||
3024 recovery_start
== MaxSector
)
3025 return sprintf(page
, "none\n");
3027 return sprintf(page
, "%llu\n", recovery_start
);
3030 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3032 unsigned long long recovery_start
;
3034 if (cmd_match(buf
, "none"))
3035 recovery_start
= MaxSector
;
3036 else if (kstrtoull(buf
, 10, &recovery_start
))
3039 if (rdev
->mddev
->pers
&&
3040 rdev
->raid_disk
>= 0)
3043 rdev
->recovery_offset
= recovery_start
;
3044 if (recovery_start
== MaxSector
)
3045 set_bit(In_sync
, &rdev
->flags
);
3047 clear_bit(In_sync
, &rdev
->flags
);
3051 static struct rdev_sysfs_entry rdev_recovery_start
=
3052 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3054 /* sysfs access to bad-blocks list.
3055 * We present two files.
3056 * 'bad-blocks' lists sector numbers and lengths of ranges that
3057 * are recorded as bad. The list is truncated to fit within
3058 * the one-page limit of sysfs.
3059 * Writing "sector length" to this file adds an acknowledged
3061 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3062 * been acknowledged. Writing to this file adds bad blocks
3063 * without acknowledging them. This is largely for testing.
3065 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3067 return badblocks_show(&rdev
->badblocks
, page
, 0);
3069 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3071 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3072 /* Maybe that ack was all we needed */
3073 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3074 wake_up(&rdev
->blocked_wait
);
3077 static struct rdev_sysfs_entry rdev_bad_blocks
=
3078 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3080 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3082 return badblocks_show(&rdev
->badblocks
, page
, 1);
3084 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3086 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3088 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3089 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3091 static struct attribute
*rdev_default_attrs
[] = {
3096 &rdev_new_offset
.attr
,
3098 &rdev_recovery_start
.attr
,
3099 &rdev_bad_blocks
.attr
,
3100 &rdev_unack_bad_blocks
.attr
,
3104 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3106 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3107 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3113 return entry
->show(rdev
, page
);
3117 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3118 const char *page
, size_t length
)
3120 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3121 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3123 struct mddev
*mddev
= rdev
->mddev
;
3127 if (!capable(CAP_SYS_ADMIN
))
3129 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3131 if (rdev
->mddev
== NULL
)
3134 rv
= entry
->store(rdev
, page
, length
);
3135 mddev_unlock(mddev
);
3140 static void rdev_free(struct kobject
*ko
)
3142 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3145 static const struct sysfs_ops rdev_sysfs_ops
= {
3146 .show
= rdev_attr_show
,
3147 .store
= rdev_attr_store
,
3149 static struct kobj_type rdev_ktype
= {
3150 .release
= rdev_free
,
3151 .sysfs_ops
= &rdev_sysfs_ops
,
3152 .default_attrs
= rdev_default_attrs
,
3155 int md_rdev_init(struct md_rdev
*rdev
)
3158 rdev
->saved_raid_disk
= -1;
3159 rdev
->raid_disk
= -1;
3161 rdev
->data_offset
= 0;
3162 rdev
->new_data_offset
= 0;
3163 rdev
->sb_events
= 0;
3164 rdev
->last_read_error
.tv_sec
= 0;
3165 rdev
->last_read_error
.tv_nsec
= 0;
3166 rdev
->sb_loaded
= 0;
3167 rdev
->bb_page
= NULL
;
3168 atomic_set(&rdev
->nr_pending
, 0);
3169 atomic_set(&rdev
->read_errors
, 0);
3170 atomic_set(&rdev
->corrected_errors
, 0);
3172 INIT_LIST_HEAD(&rdev
->same_set
);
3173 init_waitqueue_head(&rdev
->blocked_wait
);
3175 /* Add space to store bad block list.
3176 * This reserves the space even on arrays where it cannot
3177 * be used - I wonder if that matters
3179 return badblocks_init(&rdev
->badblocks
, 0);
3181 EXPORT_SYMBOL_GPL(md_rdev_init
);
3183 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3185 * mark the device faulty if:
3187 * - the device is nonexistent (zero size)
3188 * - the device has no valid superblock
3190 * a faulty rdev _never_ has rdev->sb set.
3192 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3194 char b
[BDEVNAME_SIZE
];
3196 struct md_rdev
*rdev
;
3199 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3201 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3202 return ERR_PTR(-ENOMEM
);
3205 err
= md_rdev_init(rdev
);
3208 err
= alloc_disk_sb(rdev
);
3212 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3216 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3218 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3221 "md: %s has zero or unknown size, marking faulty!\n",
3222 bdevname(rdev
->bdev
,b
));
3227 if (super_format
>= 0) {
3228 err
= super_types
[super_format
].
3229 load_super(rdev
, NULL
, super_minor
);
3230 if (err
== -EINVAL
) {
3232 "md: %s does not have a valid v%d.%d "
3233 "superblock, not importing!\n",
3234 bdevname(rdev
->bdev
,b
),
3235 super_format
, super_minor
);
3240 "md: could not read %s's sb, not importing!\n",
3241 bdevname(rdev
->bdev
,b
));
3251 md_rdev_clear(rdev
);
3253 return ERR_PTR(err
);
3257 * Check a full RAID array for plausibility
3260 static void analyze_sbs(struct mddev
*mddev
)
3263 struct md_rdev
*rdev
, *freshest
, *tmp
;
3264 char b
[BDEVNAME_SIZE
];
3267 rdev_for_each_safe(rdev
, tmp
, mddev
)
3268 switch (super_types
[mddev
->major_version
].
3269 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3277 "md: fatal superblock inconsistency in %s"
3278 " -- removing from array\n",
3279 bdevname(rdev
->bdev
,b
));
3280 md_kick_rdev_from_array(rdev
);
3283 super_types
[mddev
->major_version
].
3284 validate_super(mddev
, freshest
);
3287 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3288 if (mddev
->max_disks
&&
3289 (rdev
->desc_nr
>= mddev
->max_disks
||
3290 i
> mddev
->max_disks
)) {
3292 "md: %s: %s: only %d devices permitted\n",
3293 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3295 md_kick_rdev_from_array(rdev
);
3298 if (rdev
!= freshest
) {
3299 if (super_types
[mddev
->major_version
].
3300 validate_super(mddev
, rdev
)) {
3301 printk(KERN_WARNING
"md: kicking non-fresh %s"
3303 bdevname(rdev
->bdev
,b
));
3304 md_kick_rdev_from_array(rdev
);
3308 if (mddev
->level
== LEVEL_MULTIPATH
) {
3309 rdev
->desc_nr
= i
++;
3310 rdev
->raid_disk
= rdev
->desc_nr
;
3311 set_bit(In_sync
, &rdev
->flags
);
3312 } else if (rdev
->raid_disk
>=
3313 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3314 !test_bit(Journal
, &rdev
->flags
)) {
3315 rdev
->raid_disk
= -1;
3316 clear_bit(In_sync
, &rdev
->flags
);
3321 /* Read a fixed-point number.
3322 * Numbers in sysfs attributes should be in "standard" units where
3323 * possible, so time should be in seconds.
3324 * However we internally use a a much smaller unit such as
3325 * milliseconds or jiffies.
3326 * This function takes a decimal number with a possible fractional
3327 * component, and produces an integer which is the result of
3328 * multiplying that number by 10^'scale'.
3329 * all without any floating-point arithmetic.
3331 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3333 unsigned long result
= 0;
3335 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3338 else if (decimals
< scale
) {
3341 result
= result
* 10 + value
;
3353 while (decimals
< scale
) {
3362 safe_delay_show(struct mddev
*mddev
, char *page
)
3364 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3365 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3368 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3372 if (mddev_is_clustered(mddev
)) {
3373 pr_info("md: Safemode is disabled for clustered mode\n");
3377 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3380 mddev
->safemode_delay
= 0;
3382 unsigned long old_delay
= mddev
->safemode_delay
;
3383 unsigned long new_delay
= (msec
*HZ
)/1000;
3387 mddev
->safemode_delay
= new_delay
;
3388 if (new_delay
< old_delay
|| old_delay
== 0)
3389 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3393 static struct md_sysfs_entry md_safe_delay
=
3394 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3397 level_show(struct mddev
*mddev
, char *page
)
3399 struct md_personality
*p
;
3401 spin_lock(&mddev
->lock
);
3404 ret
= sprintf(page
, "%s\n", p
->name
);
3405 else if (mddev
->clevel
[0])
3406 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3407 else if (mddev
->level
!= LEVEL_NONE
)
3408 ret
= sprintf(page
, "%d\n", mddev
->level
);
3411 spin_unlock(&mddev
->lock
);
3416 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3421 struct md_personality
*pers
, *oldpers
;
3423 void *priv
, *oldpriv
;
3424 struct md_rdev
*rdev
;
3426 if (slen
== 0 || slen
>= sizeof(clevel
))
3429 rv
= mddev_lock(mddev
);
3433 if (mddev
->pers
== NULL
) {
3434 strncpy(mddev
->clevel
, buf
, slen
);
3435 if (mddev
->clevel
[slen
-1] == '\n')
3437 mddev
->clevel
[slen
] = 0;
3438 mddev
->level
= LEVEL_NONE
;
3446 /* request to change the personality. Need to ensure:
3447 * - array is not engaged in resync/recovery/reshape
3448 * - old personality can be suspended
3449 * - new personality will access other array.
3453 if (mddev
->sync_thread
||
3454 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3455 mddev
->reshape_position
!= MaxSector
||
3456 mddev
->sysfs_active
)
3460 if (!mddev
->pers
->quiesce
) {
3461 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3462 mdname(mddev
), mddev
->pers
->name
);
3466 /* Now find the new personality */
3467 strncpy(clevel
, buf
, slen
);
3468 if (clevel
[slen
-1] == '\n')
3471 if (kstrtol(clevel
, 10, &level
))
3474 if (request_module("md-%s", clevel
) != 0)
3475 request_module("md-level-%s", clevel
);
3476 spin_lock(&pers_lock
);
3477 pers
= find_pers(level
, clevel
);
3478 if (!pers
|| !try_module_get(pers
->owner
)) {
3479 spin_unlock(&pers_lock
);
3480 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3484 spin_unlock(&pers_lock
);
3486 if (pers
== mddev
->pers
) {
3487 /* Nothing to do! */
3488 module_put(pers
->owner
);
3492 if (!pers
->takeover
) {
3493 module_put(pers
->owner
);
3494 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3495 mdname(mddev
), clevel
);
3500 rdev_for_each(rdev
, mddev
)
3501 rdev
->new_raid_disk
= rdev
->raid_disk
;
3503 /* ->takeover must set new_* and/or delta_disks
3504 * if it succeeds, and may set them when it fails.
3506 priv
= pers
->takeover(mddev
);
3508 mddev
->new_level
= mddev
->level
;
3509 mddev
->new_layout
= mddev
->layout
;
3510 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3511 mddev
->raid_disks
-= mddev
->delta_disks
;
3512 mddev
->delta_disks
= 0;
3513 mddev
->reshape_backwards
= 0;
3514 module_put(pers
->owner
);
3515 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3516 mdname(mddev
), clevel
);
3521 /* Looks like we have a winner */
3522 mddev_suspend(mddev
);
3523 mddev_detach(mddev
);
3525 spin_lock(&mddev
->lock
);
3526 oldpers
= mddev
->pers
;
3527 oldpriv
= mddev
->private;
3529 mddev
->private = priv
;
3530 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3531 mddev
->level
= mddev
->new_level
;
3532 mddev
->layout
= mddev
->new_layout
;
3533 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3534 mddev
->delta_disks
= 0;
3535 mddev
->reshape_backwards
= 0;
3536 mddev
->degraded
= 0;
3537 spin_unlock(&mddev
->lock
);
3539 if (oldpers
->sync_request
== NULL
&&
3541 /* We are converting from a no-redundancy array
3542 * to a redundancy array and metadata is managed
3543 * externally so we need to be sure that writes
3544 * won't block due to a need to transition
3546 * until external management is started.
3549 mddev
->safemode_delay
= 0;
3550 mddev
->safemode
= 0;
3553 oldpers
->free(mddev
, oldpriv
);
3555 if (oldpers
->sync_request
== NULL
&&
3556 pers
->sync_request
!= NULL
) {
3557 /* need to add the md_redundancy_group */
3558 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3560 "md: cannot register extra attributes for %s\n",
3562 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3564 if (oldpers
->sync_request
!= NULL
&&
3565 pers
->sync_request
== NULL
) {
3566 /* need to remove the md_redundancy_group */
3567 if (mddev
->to_remove
== NULL
)
3568 mddev
->to_remove
= &md_redundancy_group
;
3571 rdev_for_each(rdev
, mddev
) {
3572 if (rdev
->raid_disk
< 0)
3574 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3575 rdev
->new_raid_disk
= -1;
3576 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3578 sysfs_unlink_rdev(mddev
, rdev
);
3580 rdev_for_each(rdev
, mddev
) {
3581 if (rdev
->raid_disk
< 0)
3583 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3585 rdev
->raid_disk
= rdev
->new_raid_disk
;
3586 if (rdev
->raid_disk
< 0)
3587 clear_bit(In_sync
, &rdev
->flags
);
3589 if (sysfs_link_rdev(mddev
, rdev
))
3590 printk(KERN_WARNING
"md: cannot register rd%d"
3591 " for %s after level change\n",
3592 rdev
->raid_disk
, mdname(mddev
));
3596 if (pers
->sync_request
== NULL
) {
3597 /* this is now an array without redundancy, so
3598 * it must always be in_sync
3601 del_timer_sync(&mddev
->safemode_timer
);
3603 blk_set_stacking_limits(&mddev
->queue
->limits
);
3605 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3606 mddev_resume(mddev
);
3608 md_update_sb(mddev
, 1);
3609 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3610 md_new_event(mddev
);
3613 mddev_unlock(mddev
);
3617 static struct md_sysfs_entry md_level
=
3618 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3621 layout_show(struct mddev
*mddev
, char *page
)
3623 /* just a number, not meaningful for all levels */
3624 if (mddev
->reshape_position
!= MaxSector
&&
3625 mddev
->layout
!= mddev
->new_layout
)
3626 return sprintf(page
, "%d (%d)\n",
3627 mddev
->new_layout
, mddev
->layout
);
3628 return sprintf(page
, "%d\n", mddev
->layout
);
3632 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3637 err
= kstrtouint(buf
, 10, &n
);
3640 err
= mddev_lock(mddev
);
3645 if (mddev
->pers
->check_reshape
== NULL
)
3650 mddev
->new_layout
= n
;
3651 err
= mddev
->pers
->check_reshape(mddev
);
3653 mddev
->new_layout
= mddev
->layout
;
3656 mddev
->new_layout
= n
;
3657 if (mddev
->reshape_position
== MaxSector
)
3660 mddev_unlock(mddev
);
3663 static struct md_sysfs_entry md_layout
=
3664 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3667 raid_disks_show(struct mddev
*mddev
, char *page
)
3669 if (mddev
->raid_disks
== 0)
3671 if (mddev
->reshape_position
!= MaxSector
&&
3672 mddev
->delta_disks
!= 0)
3673 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3674 mddev
->raid_disks
- mddev
->delta_disks
);
3675 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3678 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3681 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3686 err
= kstrtouint(buf
, 10, &n
);
3690 err
= mddev_lock(mddev
);
3694 err
= update_raid_disks(mddev
, n
);
3695 else if (mddev
->reshape_position
!= MaxSector
) {
3696 struct md_rdev
*rdev
;
3697 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3700 rdev_for_each(rdev
, mddev
) {
3702 rdev
->data_offset
< rdev
->new_data_offset
)
3705 rdev
->data_offset
> rdev
->new_data_offset
)
3709 mddev
->delta_disks
= n
- olddisks
;
3710 mddev
->raid_disks
= n
;
3711 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3713 mddev
->raid_disks
= n
;
3715 mddev_unlock(mddev
);
3716 return err
? err
: len
;
3718 static struct md_sysfs_entry md_raid_disks
=
3719 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3722 chunk_size_show(struct mddev
*mddev
, char *page
)
3724 if (mddev
->reshape_position
!= MaxSector
&&
3725 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3726 return sprintf(page
, "%d (%d)\n",
3727 mddev
->new_chunk_sectors
<< 9,
3728 mddev
->chunk_sectors
<< 9);
3729 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3733 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3738 err
= kstrtoul(buf
, 10, &n
);
3742 err
= mddev_lock(mddev
);
3746 if (mddev
->pers
->check_reshape
== NULL
)
3751 mddev
->new_chunk_sectors
= n
>> 9;
3752 err
= mddev
->pers
->check_reshape(mddev
);
3754 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3757 mddev
->new_chunk_sectors
= n
>> 9;
3758 if (mddev
->reshape_position
== MaxSector
)
3759 mddev
->chunk_sectors
= n
>> 9;
3761 mddev_unlock(mddev
);
3764 static struct md_sysfs_entry md_chunk_size
=
3765 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3768 resync_start_show(struct mddev
*mddev
, char *page
)
3770 if (mddev
->recovery_cp
== MaxSector
)
3771 return sprintf(page
, "none\n");
3772 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3776 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3778 unsigned long long n
;
3781 if (cmd_match(buf
, "none"))
3784 err
= kstrtoull(buf
, 10, &n
);
3787 if (n
!= (sector_t
)n
)
3791 err
= mddev_lock(mddev
);
3794 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3798 mddev
->recovery_cp
= n
;
3800 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3802 mddev_unlock(mddev
);
3805 static struct md_sysfs_entry md_resync_start
=
3806 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3807 resync_start_show
, resync_start_store
);
3810 * The array state can be:
3813 * No devices, no size, no level
3814 * Equivalent to STOP_ARRAY ioctl
3816 * May have some settings, but array is not active
3817 * all IO results in error
3818 * When written, doesn't tear down array, but just stops it
3819 * suspended (not supported yet)
3820 * All IO requests will block. The array can be reconfigured.
3821 * Writing this, if accepted, will block until array is quiescent
3823 * no resync can happen. no superblocks get written.
3824 * write requests fail
3826 * like readonly, but behaves like 'clean' on a write request.
3828 * clean - no pending writes, but otherwise active.
3829 * When written to inactive array, starts without resync
3830 * If a write request arrives then
3831 * if metadata is known, mark 'dirty' and switch to 'active'.
3832 * if not known, block and switch to write-pending
3833 * If written to an active array that has pending writes, then fails.
3835 * fully active: IO and resync can be happening.
3836 * When written to inactive array, starts with resync
3839 * clean, but writes are blocked waiting for 'active' to be written.
3842 * like active, but no writes have been seen for a while (100msec).
3845 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3846 write_pending
, active_idle
, bad_word
};
3847 static char *array_states
[] = {
3848 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3849 "write-pending", "active-idle", NULL
};
3851 static int match_word(const char *word
, char **list
)
3854 for (n
=0; list
[n
]; n
++)
3855 if (cmd_match(word
, list
[n
]))
3861 array_state_show(struct mddev
*mddev
, char *page
)
3863 enum array_state st
= inactive
;
3876 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3878 else if (mddev
->safemode
)
3884 if (list_empty(&mddev
->disks
) &&
3885 mddev
->raid_disks
== 0 &&
3886 mddev
->dev_sectors
== 0)
3891 return sprintf(page
, "%s\n", array_states
[st
]);
3894 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3895 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3896 static int do_md_run(struct mddev
*mddev
);
3897 static int restart_array(struct mddev
*mddev
);
3900 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3903 enum array_state st
= match_word(buf
, array_states
);
3905 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3906 /* don't take reconfig_mutex when toggling between
3909 spin_lock(&mddev
->lock
);
3911 restart_array(mddev
);
3912 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3913 wake_up(&mddev
->sb_wait
);
3915 } else /* st == clean */ {
3916 restart_array(mddev
);
3917 if (atomic_read(&mddev
->writes_pending
) == 0) {
3918 if (mddev
->in_sync
== 0) {
3920 if (mddev
->safemode
== 1)
3921 mddev
->safemode
= 0;
3922 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3928 spin_unlock(&mddev
->lock
);
3931 err
= mddev_lock(mddev
);
3939 /* stopping an active array */
3940 err
= do_md_stop(mddev
, 0, NULL
);
3943 /* stopping an active array */
3945 err
= do_md_stop(mddev
, 2, NULL
);
3947 err
= 0; /* already inactive */
3950 break; /* not supported yet */
3953 err
= md_set_readonly(mddev
, NULL
);
3956 set_disk_ro(mddev
->gendisk
, 1);
3957 err
= do_md_run(mddev
);
3963 err
= md_set_readonly(mddev
, NULL
);
3964 else if (mddev
->ro
== 1)
3965 err
= restart_array(mddev
);
3968 set_disk_ro(mddev
->gendisk
, 0);
3972 err
= do_md_run(mddev
);
3977 err
= restart_array(mddev
);
3980 spin_lock(&mddev
->lock
);
3981 if (atomic_read(&mddev
->writes_pending
) == 0) {
3982 if (mddev
->in_sync
== 0) {
3984 if (mddev
->safemode
== 1)
3985 mddev
->safemode
= 0;
3986 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3991 spin_unlock(&mddev
->lock
);
3997 err
= restart_array(mddev
);
4000 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
4001 wake_up(&mddev
->sb_wait
);
4005 set_disk_ro(mddev
->gendisk
, 0);
4006 err
= do_md_run(mddev
);
4011 /* these cannot be set */
4016 if (mddev
->hold_active
== UNTIL_IOCTL
)
4017 mddev
->hold_active
= 0;
4018 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4020 mddev_unlock(mddev
);
4023 static struct md_sysfs_entry md_array_state
=
4024 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4027 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4028 return sprintf(page
, "%d\n",
4029 atomic_read(&mddev
->max_corr_read_errors
));
4033 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4038 rv
= kstrtouint(buf
, 10, &n
);
4041 atomic_set(&mddev
->max_corr_read_errors
, n
);
4045 static struct md_sysfs_entry max_corr_read_errors
=
4046 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4047 max_corrected_read_errors_store
);
4050 null_show(struct mddev
*mddev
, char *page
)
4056 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4058 /* buf must be %d:%d\n? giving major and minor numbers */
4059 /* The new device is added to the array.
4060 * If the array has a persistent superblock, we read the
4061 * superblock to initialise info and check validity.
4062 * Otherwise, only checking done is that in bind_rdev_to_array,
4063 * which mainly checks size.
4066 int major
= simple_strtoul(buf
, &e
, 10);
4069 struct md_rdev
*rdev
;
4072 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4074 minor
= simple_strtoul(e
+1, &e
, 10);
4075 if (*e
&& *e
!= '\n')
4077 dev
= MKDEV(major
, minor
);
4078 if (major
!= MAJOR(dev
) ||
4079 minor
!= MINOR(dev
))
4082 flush_workqueue(md_misc_wq
);
4084 err
= mddev_lock(mddev
);
4087 if (mddev
->persistent
) {
4088 rdev
= md_import_device(dev
, mddev
->major_version
,
4089 mddev
->minor_version
);
4090 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4091 struct md_rdev
*rdev0
4092 = list_entry(mddev
->disks
.next
,
4093 struct md_rdev
, same_set
);
4094 err
= super_types
[mddev
->major_version
]
4095 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4099 } else if (mddev
->external
)
4100 rdev
= md_import_device(dev
, -2, -1);
4102 rdev
= md_import_device(dev
, -1, -1);
4105 mddev_unlock(mddev
);
4106 return PTR_ERR(rdev
);
4108 err
= bind_rdev_to_array(rdev
, mddev
);
4112 mddev_unlock(mddev
);
4113 return err
? err
: len
;
4116 static struct md_sysfs_entry md_new_device
=
4117 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4120 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4123 unsigned long chunk
, end_chunk
;
4126 err
= mddev_lock(mddev
);
4131 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4133 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4134 if (buf
== end
) break;
4135 if (*end
== '-') { /* range */
4137 end_chunk
= simple_strtoul(buf
, &end
, 0);
4138 if (buf
== end
) break;
4140 if (*end
&& !isspace(*end
)) break;
4141 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4142 buf
= skip_spaces(end
);
4144 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4146 mddev_unlock(mddev
);
4150 static struct md_sysfs_entry md_bitmap
=
4151 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4154 size_show(struct mddev
*mddev
, char *page
)
4156 return sprintf(page
, "%llu\n",
4157 (unsigned long long)mddev
->dev_sectors
/ 2);
4160 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4163 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4165 /* If array is inactive, we can reduce the component size, but
4166 * not increase it (except from 0).
4167 * If array is active, we can try an on-line resize
4170 int err
= strict_blocks_to_sectors(buf
, §ors
);
4174 err
= mddev_lock(mddev
);
4178 err
= update_size(mddev
, sectors
);
4179 md_update_sb(mddev
, 1);
4181 if (mddev
->dev_sectors
== 0 ||
4182 mddev
->dev_sectors
> sectors
)
4183 mddev
->dev_sectors
= sectors
;
4187 mddev_unlock(mddev
);
4188 return err
? err
: len
;
4191 static struct md_sysfs_entry md_size
=
4192 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4194 /* Metadata version.
4196 * 'none' for arrays with no metadata (good luck...)
4197 * 'external' for arrays with externally managed metadata,
4198 * or N.M for internally known formats
4201 metadata_show(struct mddev
*mddev
, char *page
)
4203 if (mddev
->persistent
)
4204 return sprintf(page
, "%d.%d\n",
4205 mddev
->major_version
, mddev
->minor_version
);
4206 else if (mddev
->external
)
4207 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4209 return sprintf(page
, "none\n");
4213 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4218 /* Changing the details of 'external' metadata is
4219 * always permitted. Otherwise there must be
4220 * no devices attached to the array.
4223 err
= mddev_lock(mddev
);
4227 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4229 else if (!list_empty(&mddev
->disks
))
4233 if (cmd_match(buf
, "none")) {
4234 mddev
->persistent
= 0;
4235 mddev
->external
= 0;
4236 mddev
->major_version
= 0;
4237 mddev
->minor_version
= 90;
4240 if (strncmp(buf
, "external:", 9) == 0) {
4241 size_t namelen
= len
-9;
4242 if (namelen
>= sizeof(mddev
->metadata_type
))
4243 namelen
= sizeof(mddev
->metadata_type
)-1;
4244 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4245 mddev
->metadata_type
[namelen
] = 0;
4246 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4247 mddev
->metadata_type
[--namelen
] = 0;
4248 mddev
->persistent
= 0;
4249 mddev
->external
= 1;
4250 mddev
->major_version
= 0;
4251 mddev
->minor_version
= 90;
4254 major
= simple_strtoul(buf
, &e
, 10);
4256 if (e
==buf
|| *e
!= '.')
4259 minor
= simple_strtoul(buf
, &e
, 10);
4260 if (e
==buf
|| (*e
&& *e
!= '\n') )
4263 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4265 mddev
->major_version
= major
;
4266 mddev
->minor_version
= minor
;
4267 mddev
->persistent
= 1;
4268 mddev
->external
= 0;
4271 mddev_unlock(mddev
);
4275 static struct md_sysfs_entry md_metadata
=
4276 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4279 action_show(struct mddev
*mddev
, char *page
)
4281 char *type
= "idle";
4282 unsigned long recovery
= mddev
->recovery
;
4283 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4285 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4286 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4287 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4289 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4290 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4292 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4296 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4298 else if (mddev
->reshape_position
!= MaxSector
)
4301 return sprintf(page
, "%s\n", type
);
4305 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4307 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4311 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4312 if (cmd_match(page
, "frozen"))
4313 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4315 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4316 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4317 mddev_lock(mddev
) == 0) {
4318 flush_workqueue(md_misc_wq
);
4319 if (mddev
->sync_thread
) {
4320 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4321 md_reap_sync_thread(mddev
);
4323 mddev_unlock(mddev
);
4325 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4327 else if (cmd_match(page
, "resync"))
4328 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4329 else if (cmd_match(page
, "recover")) {
4330 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4331 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4332 } else if (cmd_match(page
, "reshape")) {
4334 if (mddev
->pers
->start_reshape
== NULL
)
4336 err
= mddev_lock(mddev
);
4338 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4341 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4342 err
= mddev
->pers
->start_reshape(mddev
);
4344 mddev_unlock(mddev
);
4348 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4350 if (cmd_match(page
, "check"))
4351 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4352 else if (!cmd_match(page
, "repair"))
4354 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4355 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4356 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4358 if (mddev
->ro
== 2) {
4359 /* A write to sync_action is enough to justify
4360 * canceling read-auto mode
4363 md_wakeup_thread(mddev
->sync_thread
);
4365 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4366 md_wakeup_thread(mddev
->thread
);
4367 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4371 static struct md_sysfs_entry md_scan_mode
=
4372 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4375 last_sync_action_show(struct mddev
*mddev
, char *page
)
4377 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4380 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4383 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4385 return sprintf(page
, "%llu\n",
4386 (unsigned long long)
4387 atomic64_read(&mddev
->resync_mismatches
));
4390 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4393 sync_min_show(struct mddev
*mddev
, char *page
)
4395 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4396 mddev
->sync_speed_min
? "local": "system");
4400 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4405 if (strncmp(buf
, "system", 6)==0) {
4408 rv
= kstrtouint(buf
, 10, &min
);
4414 mddev
->sync_speed_min
= min
;
4418 static struct md_sysfs_entry md_sync_min
=
4419 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4422 sync_max_show(struct mddev
*mddev
, char *page
)
4424 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4425 mddev
->sync_speed_max
? "local": "system");
4429 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4434 if (strncmp(buf
, "system", 6)==0) {
4437 rv
= kstrtouint(buf
, 10, &max
);
4443 mddev
->sync_speed_max
= max
;
4447 static struct md_sysfs_entry md_sync_max
=
4448 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4451 degraded_show(struct mddev
*mddev
, char *page
)
4453 return sprintf(page
, "%d\n", mddev
->degraded
);
4455 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4458 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4460 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4464 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4468 if (kstrtol(buf
, 10, &n
))
4471 if (n
!= 0 && n
!= 1)
4474 mddev
->parallel_resync
= n
;
4476 if (mddev
->sync_thread
)
4477 wake_up(&resync_wait
);
4482 /* force parallel resync, even with shared block devices */
4483 static struct md_sysfs_entry md_sync_force_parallel
=
4484 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4485 sync_force_parallel_show
, sync_force_parallel_store
);
4488 sync_speed_show(struct mddev
*mddev
, char *page
)
4490 unsigned long resync
, dt
, db
;
4491 if (mddev
->curr_resync
== 0)
4492 return sprintf(page
, "none\n");
4493 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4494 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4496 db
= resync
- mddev
->resync_mark_cnt
;
4497 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4500 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4503 sync_completed_show(struct mddev
*mddev
, char *page
)
4505 unsigned long long max_sectors
, resync
;
4507 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4508 return sprintf(page
, "none\n");
4510 if (mddev
->curr_resync
== 1 ||
4511 mddev
->curr_resync
== 2)
4512 return sprintf(page
, "delayed\n");
4514 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4515 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4516 max_sectors
= mddev
->resync_max_sectors
;
4518 max_sectors
= mddev
->dev_sectors
;
4520 resync
= mddev
->curr_resync_completed
;
4521 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4524 static struct md_sysfs_entry md_sync_completed
=
4525 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4528 min_sync_show(struct mddev
*mddev
, char *page
)
4530 return sprintf(page
, "%llu\n",
4531 (unsigned long long)mddev
->resync_min
);
4534 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4536 unsigned long long min
;
4539 if (kstrtoull(buf
, 10, &min
))
4542 spin_lock(&mddev
->lock
);
4544 if (min
> mddev
->resync_max
)
4548 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4551 /* Round down to multiple of 4K for safety */
4552 mddev
->resync_min
= round_down(min
, 8);
4556 spin_unlock(&mddev
->lock
);
4560 static struct md_sysfs_entry md_min_sync
=
4561 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4564 max_sync_show(struct mddev
*mddev
, char *page
)
4566 if (mddev
->resync_max
== MaxSector
)
4567 return sprintf(page
, "max\n");
4569 return sprintf(page
, "%llu\n",
4570 (unsigned long long)mddev
->resync_max
);
4573 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4576 spin_lock(&mddev
->lock
);
4577 if (strncmp(buf
, "max", 3) == 0)
4578 mddev
->resync_max
= MaxSector
;
4580 unsigned long long max
;
4584 if (kstrtoull(buf
, 10, &max
))
4586 if (max
< mddev
->resync_min
)
4590 if (max
< mddev
->resync_max
&&
4592 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4595 /* Must be a multiple of chunk_size */
4596 chunk
= mddev
->chunk_sectors
;
4598 sector_t temp
= max
;
4601 if (sector_div(temp
, chunk
))
4604 mddev
->resync_max
= max
;
4606 wake_up(&mddev
->recovery_wait
);
4609 spin_unlock(&mddev
->lock
);
4613 static struct md_sysfs_entry md_max_sync
=
4614 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4617 suspend_lo_show(struct mddev
*mddev
, char *page
)
4619 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4623 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4625 unsigned long long old
, new;
4628 err
= kstrtoull(buf
, 10, &new);
4631 if (new != (sector_t
)new)
4634 err
= mddev_lock(mddev
);
4638 if (mddev
->pers
== NULL
||
4639 mddev
->pers
->quiesce
== NULL
)
4641 old
= mddev
->suspend_lo
;
4642 mddev
->suspend_lo
= new;
4644 /* Shrinking suspended region */
4645 mddev
->pers
->quiesce(mddev
, 2);
4647 /* Expanding suspended region - need to wait */
4648 mddev
->pers
->quiesce(mddev
, 1);
4649 mddev
->pers
->quiesce(mddev
, 0);
4653 mddev_unlock(mddev
);
4656 static struct md_sysfs_entry md_suspend_lo
=
4657 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4660 suspend_hi_show(struct mddev
*mddev
, char *page
)
4662 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4666 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4668 unsigned long long old
, new;
4671 err
= kstrtoull(buf
, 10, &new);
4674 if (new != (sector_t
)new)
4677 err
= mddev_lock(mddev
);
4681 if (mddev
->pers
== NULL
||
4682 mddev
->pers
->quiesce
== NULL
)
4684 old
= mddev
->suspend_hi
;
4685 mddev
->suspend_hi
= new;
4687 /* Shrinking suspended region */
4688 mddev
->pers
->quiesce(mddev
, 2);
4690 /* Expanding suspended region - need to wait */
4691 mddev
->pers
->quiesce(mddev
, 1);
4692 mddev
->pers
->quiesce(mddev
, 0);
4696 mddev_unlock(mddev
);
4699 static struct md_sysfs_entry md_suspend_hi
=
4700 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4703 reshape_position_show(struct mddev
*mddev
, char *page
)
4705 if (mddev
->reshape_position
!= MaxSector
)
4706 return sprintf(page
, "%llu\n",
4707 (unsigned long long)mddev
->reshape_position
);
4708 strcpy(page
, "none\n");
4713 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4715 struct md_rdev
*rdev
;
4716 unsigned long long new;
4719 err
= kstrtoull(buf
, 10, &new);
4722 if (new != (sector_t
)new)
4724 err
= mddev_lock(mddev
);
4730 mddev
->reshape_position
= new;
4731 mddev
->delta_disks
= 0;
4732 mddev
->reshape_backwards
= 0;
4733 mddev
->new_level
= mddev
->level
;
4734 mddev
->new_layout
= mddev
->layout
;
4735 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4736 rdev_for_each(rdev
, mddev
)
4737 rdev
->new_data_offset
= rdev
->data_offset
;
4740 mddev_unlock(mddev
);
4744 static struct md_sysfs_entry md_reshape_position
=
4745 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4746 reshape_position_store
);
4749 reshape_direction_show(struct mddev
*mddev
, char *page
)
4751 return sprintf(page
, "%s\n",
4752 mddev
->reshape_backwards
? "backwards" : "forwards");
4756 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4761 if (cmd_match(buf
, "forwards"))
4763 else if (cmd_match(buf
, "backwards"))
4767 if (mddev
->reshape_backwards
== backwards
)
4770 err
= mddev_lock(mddev
);
4773 /* check if we are allowed to change */
4774 if (mddev
->delta_disks
)
4776 else if (mddev
->persistent
&&
4777 mddev
->major_version
== 0)
4780 mddev
->reshape_backwards
= backwards
;
4781 mddev_unlock(mddev
);
4785 static struct md_sysfs_entry md_reshape_direction
=
4786 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4787 reshape_direction_store
);
4790 array_size_show(struct mddev
*mddev
, char *page
)
4792 if (mddev
->external_size
)
4793 return sprintf(page
, "%llu\n",
4794 (unsigned long long)mddev
->array_sectors
/2);
4796 return sprintf(page
, "default\n");
4800 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4805 err
= mddev_lock(mddev
);
4809 if (strncmp(buf
, "default", 7) == 0) {
4811 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4813 sectors
= mddev
->array_sectors
;
4815 mddev
->external_size
= 0;
4817 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4819 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4822 mddev
->external_size
= 1;
4826 mddev
->array_sectors
= sectors
;
4828 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4829 revalidate_disk(mddev
->gendisk
);
4832 mddev_unlock(mddev
);
4836 static struct md_sysfs_entry md_array_size
=
4837 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4840 static struct attribute
*md_default_attrs
[] = {
4843 &md_raid_disks
.attr
,
4844 &md_chunk_size
.attr
,
4846 &md_resync_start
.attr
,
4848 &md_new_device
.attr
,
4849 &md_safe_delay
.attr
,
4850 &md_array_state
.attr
,
4851 &md_reshape_position
.attr
,
4852 &md_reshape_direction
.attr
,
4853 &md_array_size
.attr
,
4854 &max_corr_read_errors
.attr
,
4858 static struct attribute
*md_redundancy_attrs
[] = {
4860 &md_last_scan_mode
.attr
,
4861 &md_mismatches
.attr
,
4864 &md_sync_speed
.attr
,
4865 &md_sync_force_parallel
.attr
,
4866 &md_sync_completed
.attr
,
4869 &md_suspend_lo
.attr
,
4870 &md_suspend_hi
.attr
,
4875 static struct attribute_group md_redundancy_group
= {
4877 .attrs
= md_redundancy_attrs
,
4881 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4883 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4884 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4889 spin_lock(&all_mddevs_lock
);
4890 if (list_empty(&mddev
->all_mddevs
)) {
4891 spin_unlock(&all_mddevs_lock
);
4895 spin_unlock(&all_mddevs_lock
);
4897 rv
= entry
->show(mddev
, page
);
4903 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4904 const char *page
, size_t length
)
4906 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4907 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4912 if (!capable(CAP_SYS_ADMIN
))
4914 spin_lock(&all_mddevs_lock
);
4915 if (list_empty(&mddev
->all_mddevs
)) {
4916 spin_unlock(&all_mddevs_lock
);
4920 spin_unlock(&all_mddevs_lock
);
4921 rv
= entry
->store(mddev
, page
, length
);
4926 static void md_free(struct kobject
*ko
)
4928 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4930 if (mddev
->sysfs_state
)
4931 sysfs_put(mddev
->sysfs_state
);
4934 blk_cleanup_queue(mddev
->queue
);
4935 if (mddev
->gendisk
) {
4936 del_gendisk(mddev
->gendisk
);
4937 put_disk(mddev
->gendisk
);
4943 static const struct sysfs_ops md_sysfs_ops
= {
4944 .show
= md_attr_show
,
4945 .store
= md_attr_store
,
4947 static struct kobj_type md_ktype
= {
4949 .sysfs_ops
= &md_sysfs_ops
,
4950 .default_attrs
= md_default_attrs
,
4955 static void mddev_delayed_delete(struct work_struct
*ws
)
4957 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4959 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4960 kobject_del(&mddev
->kobj
);
4961 kobject_put(&mddev
->kobj
);
4964 static int md_alloc(dev_t dev
, char *name
)
4966 static DEFINE_MUTEX(disks_mutex
);
4967 struct mddev
*mddev
= mddev_find(dev
);
4968 struct gendisk
*disk
;
4977 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4978 shift
= partitioned
? MdpMinorShift
: 0;
4979 unit
= MINOR(mddev
->unit
) >> shift
;
4981 /* wait for any previous instance of this device to be
4982 * completely removed (mddev_delayed_delete).
4984 flush_workqueue(md_misc_wq
);
4986 mutex_lock(&disks_mutex
);
4992 /* Need to ensure that 'name' is not a duplicate.
4994 struct mddev
*mddev2
;
4995 spin_lock(&all_mddevs_lock
);
4997 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4998 if (mddev2
->gendisk
&&
4999 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5000 spin_unlock(&all_mddevs_lock
);
5003 spin_unlock(&all_mddevs_lock
);
5007 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5010 mddev
->queue
->queuedata
= mddev
;
5012 blk_queue_make_request(mddev
->queue
, md_make_request
);
5013 blk_set_stacking_limits(&mddev
->queue
->limits
);
5015 disk
= alloc_disk(1 << shift
);
5017 blk_cleanup_queue(mddev
->queue
);
5018 mddev
->queue
= NULL
;
5021 disk
->major
= MAJOR(mddev
->unit
);
5022 disk
->first_minor
= unit
<< shift
;
5024 strcpy(disk
->disk_name
, name
);
5025 else if (partitioned
)
5026 sprintf(disk
->disk_name
, "md_d%d", unit
);
5028 sprintf(disk
->disk_name
, "md%d", unit
);
5029 disk
->fops
= &md_fops
;
5030 disk
->private_data
= mddev
;
5031 disk
->queue
= mddev
->queue
;
5032 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
5033 /* Allow extended partitions. This makes the
5034 * 'mdp' device redundant, but we can't really
5037 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5038 mddev
->gendisk
= disk
;
5039 /* As soon as we call add_disk(), another thread could get
5040 * through to md_open, so make sure it doesn't get too far
5042 mutex_lock(&mddev
->open_mutex
);
5045 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5046 &disk_to_dev(disk
)->kobj
, "%s", "md");
5048 /* This isn't possible, but as kobject_init_and_add is marked
5049 * __must_check, we must do something with the result
5051 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
5055 if (mddev
->kobj
.sd
&&
5056 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5057 printk(KERN_DEBUG
"pointless warning\n");
5058 mutex_unlock(&mddev
->open_mutex
);
5060 mutex_unlock(&disks_mutex
);
5061 if (!error
&& mddev
->kobj
.sd
) {
5062 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5063 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5069 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5071 md_alloc(dev
, NULL
);
5075 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5077 /* val must be "md_*" where * is not all digits.
5078 * We allocate an array with a large free minor number, and
5079 * set the name to val. val must not already be an active name.
5081 int len
= strlen(val
);
5082 char buf
[DISK_NAME_LEN
];
5084 while (len
&& val
[len
-1] == '\n')
5086 if (len
>= DISK_NAME_LEN
)
5088 strlcpy(buf
, val
, len
+1);
5089 if (strncmp(buf
, "md_", 3) != 0)
5091 return md_alloc(0, buf
);
5094 static void md_safemode_timeout(unsigned long data
)
5096 struct mddev
*mddev
= (struct mddev
*) data
;
5098 if (!atomic_read(&mddev
->writes_pending
)) {
5099 mddev
->safemode
= 1;
5100 if (mddev
->external
)
5101 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5103 md_wakeup_thread(mddev
->thread
);
5106 static int start_dirty_degraded
;
5108 int md_run(struct mddev
*mddev
)
5111 struct md_rdev
*rdev
;
5112 struct md_personality
*pers
;
5114 if (list_empty(&mddev
->disks
))
5115 /* cannot run an array with no devices.. */
5120 /* Cannot run until previous stop completes properly */
5121 if (mddev
->sysfs_active
)
5125 * Analyze all RAID superblock(s)
5127 if (!mddev
->raid_disks
) {
5128 if (!mddev
->persistent
)
5133 if (mddev
->level
!= LEVEL_NONE
)
5134 request_module("md-level-%d", mddev
->level
);
5135 else if (mddev
->clevel
[0])
5136 request_module("md-%s", mddev
->clevel
);
5139 * Drop all container device buffers, from now on
5140 * the only valid external interface is through the md
5143 rdev_for_each(rdev
, mddev
) {
5144 if (test_bit(Faulty
, &rdev
->flags
))
5146 sync_blockdev(rdev
->bdev
);
5147 invalidate_bdev(rdev
->bdev
);
5149 /* perform some consistency tests on the device.
5150 * We don't want the data to overlap the metadata,
5151 * Internal Bitmap issues have been handled elsewhere.
5153 if (rdev
->meta_bdev
) {
5154 /* Nothing to check */;
5155 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5156 if (mddev
->dev_sectors
&&
5157 rdev
->data_offset
+ mddev
->dev_sectors
5159 printk("md: %s: data overlaps metadata\n",
5164 if (rdev
->sb_start
+ rdev
->sb_size
/512
5165 > rdev
->data_offset
) {
5166 printk("md: %s: metadata overlaps data\n",
5171 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5174 if (mddev
->bio_set
== NULL
)
5175 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5177 spin_lock(&pers_lock
);
5178 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5179 if (!pers
|| !try_module_get(pers
->owner
)) {
5180 spin_unlock(&pers_lock
);
5181 if (mddev
->level
!= LEVEL_NONE
)
5182 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5185 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5189 spin_unlock(&pers_lock
);
5190 if (mddev
->level
!= pers
->level
) {
5191 mddev
->level
= pers
->level
;
5192 mddev
->new_level
= pers
->level
;
5194 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5196 if (mddev
->reshape_position
!= MaxSector
&&
5197 pers
->start_reshape
== NULL
) {
5198 /* This personality cannot handle reshaping... */
5199 module_put(pers
->owner
);
5203 if (pers
->sync_request
) {
5204 /* Warn if this is a potentially silly
5207 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5208 struct md_rdev
*rdev2
;
5211 rdev_for_each(rdev
, mddev
)
5212 rdev_for_each(rdev2
, mddev
) {
5214 rdev
->bdev
->bd_contains
==
5215 rdev2
->bdev
->bd_contains
) {
5217 "%s: WARNING: %s appears to be"
5218 " on the same physical disk as"
5221 bdevname(rdev
->bdev
,b
),
5222 bdevname(rdev2
->bdev
,b2
));
5229 "True protection against single-disk"
5230 " failure might be compromised.\n");
5233 mddev
->recovery
= 0;
5234 /* may be over-ridden by personality */
5235 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5237 mddev
->ok_start_degraded
= start_dirty_degraded
;
5239 if (start_readonly
&& mddev
->ro
== 0)
5240 mddev
->ro
= 2; /* read-only, but switch on first write */
5242 err
= pers
->run(mddev
);
5244 printk(KERN_ERR
"md: pers->run() failed ...\n");
5245 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5246 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5247 " but 'external_size' not in effect?\n", __func__
);
5249 "md: invalid array_size %llu > default size %llu\n",
5250 (unsigned long long)mddev
->array_sectors
/ 2,
5251 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5254 if (err
== 0 && pers
->sync_request
&&
5255 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5256 struct bitmap
*bitmap
;
5258 bitmap
= bitmap_create(mddev
, -1);
5259 if (IS_ERR(bitmap
)) {
5260 err
= PTR_ERR(bitmap
);
5261 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5262 mdname(mddev
), err
);
5264 mddev
->bitmap
= bitmap
;
5268 mddev_detach(mddev
);
5270 pers
->free(mddev
, mddev
->private);
5271 mddev
->private = NULL
;
5272 module_put(pers
->owner
);
5273 bitmap_destroy(mddev
);
5277 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5278 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5280 if (pers
->sync_request
) {
5281 if (mddev
->kobj
.sd
&&
5282 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5284 "md: cannot register extra attributes for %s\n",
5286 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5287 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5290 atomic_set(&mddev
->writes_pending
,0);
5291 atomic_set(&mddev
->max_corr_read_errors
,
5292 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5293 mddev
->safemode
= 0;
5294 if (mddev_is_clustered(mddev
))
5295 mddev
->safemode_delay
= 0;
5297 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5300 spin_lock(&mddev
->lock
);
5303 spin_unlock(&mddev
->lock
);
5304 rdev_for_each(rdev
, mddev
)
5305 if (rdev
->raid_disk
>= 0)
5306 if (sysfs_link_rdev(mddev
, rdev
))
5307 /* failure here is OK */;
5309 if (mddev
->degraded
&& !mddev
->ro
)
5310 /* This ensures that recovering status is reported immediately
5311 * via sysfs - until a lack of spares is confirmed.
5313 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5314 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5316 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5317 md_update_sb(mddev
, 0);
5319 md_new_event(mddev
);
5320 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5321 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5322 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5325 EXPORT_SYMBOL_GPL(md_run
);
5327 static int do_md_run(struct mddev
*mddev
)
5331 err
= md_run(mddev
);
5334 err
= bitmap_load(mddev
);
5336 bitmap_destroy(mddev
);
5340 if (mddev_is_clustered(mddev
))
5341 md_allow_write(mddev
);
5343 md_wakeup_thread(mddev
->thread
);
5344 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5346 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5347 revalidate_disk(mddev
->gendisk
);
5349 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5354 static int restart_array(struct mddev
*mddev
)
5356 struct gendisk
*disk
= mddev
->gendisk
;
5358 /* Complain if it has no devices */
5359 if (list_empty(&mddev
->disks
))
5365 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5366 struct md_rdev
*rdev
;
5367 bool has_journal
= false;
5370 rdev_for_each_rcu(rdev
, mddev
) {
5371 if (test_bit(Journal
, &rdev
->flags
) &&
5372 !test_bit(Faulty
, &rdev
->flags
)) {
5379 /* Don't restart rw with journal missing/faulty */
5384 mddev
->safemode
= 0;
5386 set_disk_ro(disk
, 0);
5387 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5389 /* Kick recovery or resync if necessary */
5390 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5391 md_wakeup_thread(mddev
->thread
);
5392 md_wakeup_thread(mddev
->sync_thread
);
5393 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5397 static void md_clean(struct mddev
*mddev
)
5399 mddev
->array_sectors
= 0;
5400 mddev
->external_size
= 0;
5401 mddev
->dev_sectors
= 0;
5402 mddev
->raid_disks
= 0;
5403 mddev
->recovery_cp
= 0;
5404 mddev
->resync_min
= 0;
5405 mddev
->resync_max
= MaxSector
;
5406 mddev
->reshape_position
= MaxSector
;
5407 mddev
->external
= 0;
5408 mddev
->persistent
= 0;
5409 mddev
->level
= LEVEL_NONE
;
5410 mddev
->clevel
[0] = 0;
5413 mddev
->metadata_type
[0] = 0;
5414 mddev
->chunk_sectors
= 0;
5415 mddev
->ctime
= mddev
->utime
= 0;
5417 mddev
->max_disks
= 0;
5419 mddev
->can_decrease_events
= 0;
5420 mddev
->delta_disks
= 0;
5421 mddev
->reshape_backwards
= 0;
5422 mddev
->new_level
= LEVEL_NONE
;
5423 mddev
->new_layout
= 0;
5424 mddev
->new_chunk_sectors
= 0;
5425 mddev
->curr_resync
= 0;
5426 atomic64_set(&mddev
->resync_mismatches
, 0);
5427 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5428 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5429 mddev
->recovery
= 0;
5432 mddev
->degraded
= 0;
5433 mddev
->safemode
= 0;
5434 mddev
->private = NULL
;
5435 mddev
->bitmap_info
.offset
= 0;
5436 mddev
->bitmap_info
.default_offset
= 0;
5437 mddev
->bitmap_info
.default_space
= 0;
5438 mddev
->bitmap_info
.chunksize
= 0;
5439 mddev
->bitmap_info
.daemon_sleep
= 0;
5440 mddev
->bitmap_info
.max_write_behind
= 0;
5443 static void __md_stop_writes(struct mddev
*mddev
)
5445 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5446 flush_workqueue(md_misc_wq
);
5447 if (mddev
->sync_thread
) {
5448 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5449 md_reap_sync_thread(mddev
);
5452 del_timer_sync(&mddev
->safemode_timer
);
5454 bitmap_flush(mddev
);
5455 md_super_wait(mddev
);
5457 if (mddev
->ro
== 0 &&
5458 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5459 (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5460 /* mark array as shutdown cleanly */
5461 if (!mddev_is_clustered(mddev
))
5463 md_update_sb(mddev
, 1);
5467 void md_stop_writes(struct mddev
*mddev
)
5469 mddev_lock_nointr(mddev
);
5470 __md_stop_writes(mddev
);
5471 mddev_unlock(mddev
);
5473 EXPORT_SYMBOL_GPL(md_stop_writes
);
5475 static void mddev_detach(struct mddev
*mddev
)
5477 struct bitmap
*bitmap
= mddev
->bitmap
;
5478 /* wait for behind writes to complete */
5479 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5480 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5482 /* need to kick something here to make sure I/O goes? */
5483 wait_event(bitmap
->behind_wait
,
5484 atomic_read(&bitmap
->behind_writes
) == 0);
5486 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5487 mddev
->pers
->quiesce(mddev
, 1);
5488 mddev
->pers
->quiesce(mddev
, 0);
5490 md_unregister_thread(&mddev
->thread
);
5492 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5495 static void __md_stop(struct mddev
*mddev
)
5497 struct md_personality
*pers
= mddev
->pers
;
5498 mddev_detach(mddev
);
5499 /* Ensure ->event_work is done */
5500 flush_workqueue(md_misc_wq
);
5501 spin_lock(&mddev
->lock
);
5504 spin_unlock(&mddev
->lock
);
5505 pers
->free(mddev
, mddev
->private);
5506 mddev
->private = NULL
;
5507 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5508 mddev
->to_remove
= &md_redundancy_group
;
5509 module_put(pers
->owner
);
5510 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5513 void md_stop(struct mddev
*mddev
)
5515 /* stop the array and free an attached data structures.
5516 * This is called from dm-raid
5519 bitmap_destroy(mddev
);
5521 bioset_free(mddev
->bio_set
);
5524 EXPORT_SYMBOL_GPL(md_stop
);
5526 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5531 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5533 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5534 md_wakeup_thread(mddev
->thread
);
5536 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5537 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5538 if (mddev
->sync_thread
)
5539 /* Thread might be blocked waiting for metadata update
5540 * which will now never happen */
5541 wake_up_process(mddev
->sync_thread
->tsk
);
5543 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5545 mddev_unlock(mddev
);
5546 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5548 wait_event(mddev
->sb_wait
,
5549 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5550 mddev_lock_nointr(mddev
);
5552 mutex_lock(&mddev
->open_mutex
);
5553 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5554 mddev
->sync_thread
||
5555 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5556 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5557 printk("md: %s still in use.\n",mdname(mddev
));
5559 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5560 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5561 md_wakeup_thread(mddev
->thread
);
5567 __md_stop_writes(mddev
);
5573 set_disk_ro(mddev
->gendisk
, 1);
5574 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5575 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5576 md_wakeup_thread(mddev
->thread
);
5577 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5581 mutex_unlock(&mddev
->open_mutex
);
5586 * 0 - completely stop and dis-assemble array
5587 * 2 - stop but do not disassemble array
5589 static int do_md_stop(struct mddev
*mddev
, int mode
,
5590 struct block_device
*bdev
)
5592 struct gendisk
*disk
= mddev
->gendisk
;
5593 struct md_rdev
*rdev
;
5596 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5598 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5599 md_wakeup_thread(mddev
->thread
);
5601 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5602 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5603 if (mddev
->sync_thread
)
5604 /* Thread might be blocked waiting for metadata update
5605 * which will now never happen */
5606 wake_up_process(mddev
->sync_thread
->tsk
);
5608 mddev_unlock(mddev
);
5609 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5610 !test_bit(MD_RECOVERY_RUNNING
,
5611 &mddev
->recovery
)));
5612 mddev_lock_nointr(mddev
);
5614 mutex_lock(&mddev
->open_mutex
);
5615 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5616 mddev
->sysfs_active
||
5617 mddev
->sync_thread
||
5618 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5619 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5620 printk("md: %s still in use.\n",mdname(mddev
));
5621 mutex_unlock(&mddev
->open_mutex
);
5623 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5624 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5625 md_wakeup_thread(mddev
->thread
);
5631 set_disk_ro(disk
, 0);
5633 __md_stop_writes(mddev
);
5635 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5637 /* tell userspace to handle 'inactive' */
5638 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5640 rdev_for_each(rdev
, mddev
)
5641 if (rdev
->raid_disk
>= 0)
5642 sysfs_unlink_rdev(mddev
, rdev
);
5644 set_capacity(disk
, 0);
5645 mutex_unlock(&mddev
->open_mutex
);
5647 revalidate_disk(disk
);
5652 mutex_unlock(&mddev
->open_mutex
);
5654 * Free resources if final stop
5657 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5659 bitmap_destroy(mddev
);
5660 if (mddev
->bitmap_info
.file
) {
5661 struct file
*f
= mddev
->bitmap_info
.file
;
5662 spin_lock(&mddev
->lock
);
5663 mddev
->bitmap_info
.file
= NULL
;
5664 spin_unlock(&mddev
->lock
);
5667 mddev
->bitmap_info
.offset
= 0;
5669 export_array(mddev
);
5672 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5673 if (mddev
->hold_active
== UNTIL_STOP
)
5674 mddev
->hold_active
= 0;
5676 md_new_event(mddev
);
5677 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5682 static void autorun_array(struct mddev
*mddev
)
5684 struct md_rdev
*rdev
;
5687 if (list_empty(&mddev
->disks
))
5690 printk(KERN_INFO
"md: running: ");
5692 rdev_for_each(rdev
, mddev
) {
5693 char b
[BDEVNAME_SIZE
];
5694 printk("<%s>", bdevname(rdev
->bdev
,b
));
5698 err
= do_md_run(mddev
);
5700 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5701 do_md_stop(mddev
, 0, NULL
);
5706 * lets try to run arrays based on all disks that have arrived
5707 * until now. (those are in pending_raid_disks)
5709 * the method: pick the first pending disk, collect all disks with
5710 * the same UUID, remove all from the pending list and put them into
5711 * the 'same_array' list. Then order this list based on superblock
5712 * update time (freshest comes first), kick out 'old' disks and
5713 * compare superblocks. If everything's fine then run it.
5715 * If "unit" is allocated, then bump its reference count
5717 static void autorun_devices(int part
)
5719 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5720 struct mddev
*mddev
;
5721 char b
[BDEVNAME_SIZE
];
5723 printk(KERN_INFO
"md: autorun ...\n");
5724 while (!list_empty(&pending_raid_disks
)) {
5727 LIST_HEAD(candidates
);
5728 rdev0
= list_entry(pending_raid_disks
.next
,
5729 struct md_rdev
, same_set
);
5731 printk(KERN_INFO
"md: considering %s ...\n",
5732 bdevname(rdev0
->bdev
,b
));
5733 INIT_LIST_HEAD(&candidates
);
5734 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5735 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5736 printk(KERN_INFO
"md: adding %s ...\n",
5737 bdevname(rdev
->bdev
,b
));
5738 list_move(&rdev
->same_set
, &candidates
);
5741 * now we have a set of devices, with all of them having
5742 * mostly sane superblocks. It's time to allocate the
5746 dev
= MKDEV(mdp_major
,
5747 rdev0
->preferred_minor
<< MdpMinorShift
);
5748 unit
= MINOR(dev
) >> MdpMinorShift
;
5750 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5753 if (rdev0
->preferred_minor
!= unit
) {
5754 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5755 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5759 md_probe(dev
, NULL
, NULL
);
5760 mddev
= mddev_find(dev
);
5761 if (!mddev
|| !mddev
->gendisk
) {
5765 "md: cannot allocate memory for md drive.\n");
5768 if (mddev_lock(mddev
))
5769 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5771 else if (mddev
->raid_disks
|| mddev
->major_version
5772 || !list_empty(&mddev
->disks
)) {
5774 "md: %s already running, cannot run %s\n",
5775 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5776 mddev_unlock(mddev
);
5778 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5779 mddev
->persistent
= 1;
5780 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5781 list_del_init(&rdev
->same_set
);
5782 if (bind_rdev_to_array(rdev
, mddev
))
5785 autorun_array(mddev
);
5786 mddev_unlock(mddev
);
5788 /* on success, candidates will be empty, on error
5791 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5792 list_del_init(&rdev
->same_set
);
5797 printk(KERN_INFO
"md: ... autorun DONE.\n");
5799 #endif /* !MODULE */
5801 static int get_version(void __user
*arg
)
5805 ver
.major
= MD_MAJOR_VERSION
;
5806 ver
.minor
= MD_MINOR_VERSION
;
5807 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5809 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5815 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5817 mdu_array_info_t info
;
5818 int nr
,working
,insync
,failed
,spare
;
5819 struct md_rdev
*rdev
;
5821 nr
= working
= insync
= failed
= spare
= 0;
5823 rdev_for_each_rcu(rdev
, mddev
) {
5825 if (test_bit(Faulty
, &rdev
->flags
))
5829 if (test_bit(In_sync
, &rdev
->flags
))
5837 info
.major_version
= mddev
->major_version
;
5838 info
.minor_version
= mddev
->minor_version
;
5839 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5840 info
.ctime
= mddev
->ctime
;
5841 info
.level
= mddev
->level
;
5842 info
.size
= mddev
->dev_sectors
/ 2;
5843 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5846 info
.raid_disks
= mddev
->raid_disks
;
5847 info
.md_minor
= mddev
->md_minor
;
5848 info
.not_persistent
= !mddev
->persistent
;
5850 info
.utime
= mddev
->utime
;
5853 info
.state
= (1<<MD_SB_CLEAN
);
5854 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5855 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5856 if (mddev_is_clustered(mddev
))
5857 info
.state
|= (1<<MD_SB_CLUSTERED
);
5858 info
.active_disks
= insync
;
5859 info
.working_disks
= working
;
5860 info
.failed_disks
= failed
;
5861 info
.spare_disks
= spare
;
5863 info
.layout
= mddev
->layout
;
5864 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5866 if (copy_to_user(arg
, &info
, sizeof(info
)))
5872 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5874 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5878 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5883 spin_lock(&mddev
->lock
);
5884 /* bitmap enabled */
5885 if (mddev
->bitmap_info
.file
) {
5886 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5887 sizeof(file
->pathname
));
5891 memmove(file
->pathname
, ptr
,
5892 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5894 spin_unlock(&mddev
->lock
);
5897 copy_to_user(arg
, file
, sizeof(*file
)))
5904 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5906 mdu_disk_info_t info
;
5907 struct md_rdev
*rdev
;
5909 if (copy_from_user(&info
, arg
, sizeof(info
)))
5913 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5915 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5916 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5917 info
.raid_disk
= rdev
->raid_disk
;
5919 if (test_bit(Faulty
, &rdev
->flags
))
5920 info
.state
|= (1<<MD_DISK_FAULTY
);
5921 else if (test_bit(In_sync
, &rdev
->flags
)) {
5922 info
.state
|= (1<<MD_DISK_ACTIVE
);
5923 info
.state
|= (1<<MD_DISK_SYNC
);
5925 if (test_bit(Journal
, &rdev
->flags
))
5926 info
.state
|= (1<<MD_DISK_JOURNAL
);
5927 if (test_bit(WriteMostly
, &rdev
->flags
))
5928 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5930 info
.major
= info
.minor
= 0;
5931 info
.raid_disk
= -1;
5932 info
.state
= (1<<MD_DISK_REMOVED
);
5936 if (copy_to_user(arg
, &info
, sizeof(info
)))
5942 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5944 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5945 struct md_rdev
*rdev
;
5946 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5948 if (mddev_is_clustered(mddev
) &&
5949 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5950 pr_err("%s: Cannot add to clustered mddev.\n",
5955 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5958 if (!mddev
->raid_disks
) {
5960 /* expecting a device which has a superblock */
5961 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5964 "md: md_import_device returned %ld\n",
5966 return PTR_ERR(rdev
);
5968 if (!list_empty(&mddev
->disks
)) {
5969 struct md_rdev
*rdev0
5970 = list_entry(mddev
->disks
.next
,
5971 struct md_rdev
, same_set
);
5972 err
= super_types
[mddev
->major_version
]
5973 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5976 "md: %s has different UUID to %s\n",
5977 bdevname(rdev
->bdev
,b
),
5978 bdevname(rdev0
->bdev
,b2
));
5983 err
= bind_rdev_to_array(rdev
, mddev
);
5990 * add_new_disk can be used once the array is assembled
5991 * to add "hot spares". They must already have a superblock
5996 if (!mddev
->pers
->hot_add_disk
) {
5998 "%s: personality does not support diskops!\n",
6002 if (mddev
->persistent
)
6003 rdev
= md_import_device(dev
, mddev
->major_version
,
6004 mddev
->minor_version
);
6006 rdev
= md_import_device(dev
, -1, -1);
6009 "md: md_import_device returned %ld\n",
6011 return PTR_ERR(rdev
);
6013 /* set saved_raid_disk if appropriate */
6014 if (!mddev
->persistent
) {
6015 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6016 info
->raid_disk
< mddev
->raid_disks
) {
6017 rdev
->raid_disk
= info
->raid_disk
;
6018 set_bit(In_sync
, &rdev
->flags
);
6019 clear_bit(Bitmap_sync
, &rdev
->flags
);
6021 rdev
->raid_disk
= -1;
6022 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6024 super_types
[mddev
->major_version
].
6025 validate_super(mddev
, rdev
);
6026 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6027 rdev
->raid_disk
!= info
->raid_disk
) {
6028 /* This was a hot-add request, but events doesn't
6029 * match, so reject it.
6035 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6036 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6037 set_bit(WriteMostly
, &rdev
->flags
);
6039 clear_bit(WriteMostly
, &rdev
->flags
);
6041 if (info
->state
& (1<<MD_DISK_JOURNAL
))
6042 set_bit(Journal
, &rdev
->flags
);
6044 * check whether the device shows up in other nodes
6046 if (mddev_is_clustered(mddev
)) {
6047 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6048 set_bit(Candidate
, &rdev
->flags
);
6049 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6050 /* --add initiated by this node */
6051 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6059 rdev
->raid_disk
= -1;
6060 err
= bind_rdev_to_array(rdev
, mddev
);
6065 if (mddev_is_clustered(mddev
)) {
6066 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6067 md_cluster_ops
->new_disk_ack(mddev
, (err
== 0));
6070 md_cluster_ops
->add_new_disk_cancel(mddev
);
6072 err
= add_bound_rdev(rdev
);
6076 err
= add_bound_rdev(rdev
);
6081 /* otherwise, add_new_disk is only allowed
6082 * for major_version==0 superblocks
6084 if (mddev
->major_version
!= 0) {
6085 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
6090 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6092 rdev
= md_import_device(dev
, -1, 0);
6095 "md: error, md_import_device() returned %ld\n",
6097 return PTR_ERR(rdev
);
6099 rdev
->desc_nr
= info
->number
;
6100 if (info
->raid_disk
< mddev
->raid_disks
)
6101 rdev
->raid_disk
= info
->raid_disk
;
6103 rdev
->raid_disk
= -1;
6105 if (rdev
->raid_disk
< mddev
->raid_disks
)
6106 if (info
->state
& (1<<MD_DISK_SYNC
))
6107 set_bit(In_sync
, &rdev
->flags
);
6109 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6110 set_bit(WriteMostly
, &rdev
->flags
);
6112 if (!mddev
->persistent
) {
6113 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
6114 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6116 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6117 rdev
->sectors
= rdev
->sb_start
;
6119 err
= bind_rdev_to_array(rdev
, mddev
);
6129 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6131 char b
[BDEVNAME_SIZE
];
6132 struct md_rdev
*rdev
;
6135 rdev
= find_rdev(mddev
, dev
);
6139 if (mddev_is_clustered(mddev
))
6140 ret
= md_cluster_ops
->metadata_update_start(mddev
);
6142 if (rdev
->raid_disk
< 0)
6145 clear_bit(Blocked
, &rdev
->flags
);
6146 remove_and_add_spares(mddev
, rdev
);
6148 if (rdev
->raid_disk
>= 0)
6152 if (mddev_is_clustered(mddev
) && ret
== 0)
6153 md_cluster_ops
->remove_disk(mddev
, rdev
);
6155 md_kick_rdev_from_array(rdev
);
6156 md_update_sb(mddev
, 1);
6157 md_new_event(mddev
);
6161 if (mddev_is_clustered(mddev
) && ret
== 0)
6162 md_cluster_ops
->metadata_update_cancel(mddev
);
6164 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
6165 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6169 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6171 char b
[BDEVNAME_SIZE
];
6173 struct md_rdev
*rdev
;
6178 if (mddev
->major_version
!= 0) {
6179 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6180 " version-0 superblocks.\n",
6184 if (!mddev
->pers
->hot_add_disk
) {
6186 "%s: personality does not support diskops!\n",
6191 rdev
= md_import_device(dev
, -1, 0);
6194 "md: error, md_import_device() returned %ld\n",
6199 if (mddev
->persistent
)
6200 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6202 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6204 rdev
->sectors
= rdev
->sb_start
;
6206 if (test_bit(Faulty
, &rdev
->flags
)) {
6208 "md: can not hot-add faulty %s disk to %s!\n",
6209 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6214 clear_bit(In_sync
, &rdev
->flags
);
6216 rdev
->saved_raid_disk
= -1;
6217 err
= bind_rdev_to_array(rdev
, mddev
);
6222 * The rest should better be atomic, we can have disk failures
6223 * noticed in interrupt contexts ...
6226 rdev
->raid_disk
= -1;
6228 md_update_sb(mddev
, 1);
6230 * Kick recovery, maybe this spare has to be added to the
6231 * array immediately.
6233 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6234 md_wakeup_thread(mddev
->thread
);
6235 md_new_event(mddev
);
6243 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6248 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6250 if (mddev
->recovery
|| mddev
->sync_thread
)
6252 /* we should be able to change the bitmap.. */
6256 struct inode
*inode
;
6259 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6260 return -EEXIST
; /* cannot add when bitmap is present */
6264 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6269 inode
= f
->f_mapping
->host
;
6270 if (!S_ISREG(inode
->i_mode
)) {
6271 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6274 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6275 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6278 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6279 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6287 mddev
->bitmap_info
.file
= f
;
6288 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6289 } else if (mddev
->bitmap
== NULL
)
6290 return -ENOENT
; /* cannot remove what isn't there */
6293 mddev
->pers
->quiesce(mddev
, 1);
6295 struct bitmap
*bitmap
;
6297 bitmap
= bitmap_create(mddev
, -1);
6298 if (!IS_ERR(bitmap
)) {
6299 mddev
->bitmap
= bitmap
;
6300 err
= bitmap_load(mddev
);
6302 err
= PTR_ERR(bitmap
);
6304 if (fd
< 0 || err
) {
6305 bitmap_destroy(mddev
);
6306 fd
= -1; /* make sure to put the file */
6308 mddev
->pers
->quiesce(mddev
, 0);
6311 struct file
*f
= mddev
->bitmap_info
.file
;
6313 spin_lock(&mddev
->lock
);
6314 mddev
->bitmap_info
.file
= NULL
;
6315 spin_unlock(&mddev
->lock
);
6324 * set_array_info is used two different ways
6325 * The original usage is when creating a new array.
6326 * In this usage, raid_disks is > 0 and it together with
6327 * level, size, not_persistent,layout,chunksize determine the
6328 * shape of the array.
6329 * This will always create an array with a type-0.90.0 superblock.
6330 * The newer usage is when assembling an array.
6331 * In this case raid_disks will be 0, and the major_version field is
6332 * use to determine which style super-blocks are to be found on the devices.
6333 * The minor and patch _version numbers are also kept incase the
6334 * super_block handler wishes to interpret them.
6336 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6339 if (info
->raid_disks
== 0) {
6340 /* just setting version number for superblock loading */
6341 if (info
->major_version
< 0 ||
6342 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6343 super_types
[info
->major_version
].name
== NULL
) {
6344 /* maybe try to auto-load a module? */
6346 "md: superblock version %d not known\n",
6347 info
->major_version
);
6350 mddev
->major_version
= info
->major_version
;
6351 mddev
->minor_version
= info
->minor_version
;
6352 mddev
->patch_version
= info
->patch_version
;
6353 mddev
->persistent
= !info
->not_persistent
;
6354 /* ensure mddev_put doesn't delete this now that there
6355 * is some minimal configuration.
6357 mddev
->ctime
= get_seconds();
6360 mddev
->major_version
= MD_MAJOR_VERSION
;
6361 mddev
->minor_version
= MD_MINOR_VERSION
;
6362 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6363 mddev
->ctime
= get_seconds();
6365 mddev
->level
= info
->level
;
6366 mddev
->clevel
[0] = 0;
6367 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6368 mddev
->raid_disks
= info
->raid_disks
;
6369 /* don't set md_minor, it is determined by which /dev/md* was
6372 if (info
->state
& (1<<MD_SB_CLEAN
))
6373 mddev
->recovery_cp
= MaxSector
;
6375 mddev
->recovery_cp
= 0;
6376 mddev
->persistent
= ! info
->not_persistent
;
6377 mddev
->external
= 0;
6379 mddev
->layout
= info
->layout
;
6380 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6382 mddev
->max_disks
= MD_SB_DISKS
;
6384 if (mddev
->persistent
)
6386 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6388 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6389 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6390 mddev
->bitmap_info
.offset
= 0;
6392 mddev
->reshape_position
= MaxSector
;
6395 * Generate a 128 bit UUID
6397 get_random_bytes(mddev
->uuid
, 16);
6399 mddev
->new_level
= mddev
->level
;
6400 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6401 mddev
->new_layout
= mddev
->layout
;
6402 mddev
->delta_disks
= 0;
6403 mddev
->reshape_backwards
= 0;
6408 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6410 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6412 if (mddev
->external_size
)
6415 mddev
->array_sectors
= array_sectors
;
6417 EXPORT_SYMBOL(md_set_array_sectors
);
6419 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6421 struct md_rdev
*rdev
;
6423 int fit
= (num_sectors
== 0);
6425 if (mddev
->pers
->resize
== NULL
)
6427 /* The "num_sectors" is the number of sectors of each device that
6428 * is used. This can only make sense for arrays with redundancy.
6429 * linear and raid0 always use whatever space is available. We can only
6430 * consider changing this number if no resync or reconstruction is
6431 * happening, and if the new size is acceptable. It must fit before the
6432 * sb_start or, if that is <data_offset, it must fit before the size
6433 * of each device. If num_sectors is zero, we find the largest size
6436 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6442 rdev_for_each(rdev
, mddev
) {
6443 sector_t avail
= rdev
->sectors
;
6445 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6446 num_sectors
= avail
;
6447 if (avail
< num_sectors
)
6450 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6452 revalidate_disk(mddev
->gendisk
);
6456 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6459 struct md_rdev
*rdev
;
6460 /* change the number of raid disks */
6461 if (mddev
->pers
->check_reshape
== NULL
)
6465 if (raid_disks
<= 0 ||
6466 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6468 if (mddev
->sync_thread
||
6469 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6470 mddev
->reshape_position
!= MaxSector
)
6473 rdev_for_each(rdev
, mddev
) {
6474 if (mddev
->raid_disks
< raid_disks
&&
6475 rdev
->data_offset
< rdev
->new_data_offset
)
6477 if (mddev
->raid_disks
> raid_disks
&&
6478 rdev
->data_offset
> rdev
->new_data_offset
)
6482 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6483 if (mddev
->delta_disks
< 0)
6484 mddev
->reshape_backwards
= 1;
6485 else if (mddev
->delta_disks
> 0)
6486 mddev
->reshape_backwards
= 0;
6488 rv
= mddev
->pers
->check_reshape(mddev
);
6490 mddev
->delta_disks
= 0;
6491 mddev
->reshape_backwards
= 0;
6497 * update_array_info is used to change the configuration of an
6499 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6500 * fields in the info are checked against the array.
6501 * Any differences that cannot be handled will cause an error.
6502 * Normally, only one change can be managed at a time.
6504 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6510 /* calculate expected state,ignoring low bits */
6511 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6512 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6514 if (mddev
->major_version
!= info
->major_version
||
6515 mddev
->minor_version
!= info
->minor_version
||
6516 /* mddev->patch_version != info->patch_version || */
6517 mddev
->ctime
!= info
->ctime
||
6518 mddev
->level
!= info
->level
||
6519 /* mddev->layout != info->layout || */
6520 mddev
->persistent
!= !info
->not_persistent
||
6521 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6522 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6523 ((state
^info
->state
) & 0xfffffe00)
6526 /* Check there is only one change */
6527 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6529 if (mddev
->raid_disks
!= info
->raid_disks
)
6531 if (mddev
->layout
!= info
->layout
)
6533 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6540 if (mddev
->layout
!= info
->layout
) {
6542 * we don't need to do anything at the md level, the
6543 * personality will take care of it all.
6545 if (mddev
->pers
->check_reshape
== NULL
)
6548 mddev
->new_layout
= info
->layout
;
6549 rv
= mddev
->pers
->check_reshape(mddev
);
6551 mddev
->new_layout
= mddev
->layout
;
6555 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6556 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6558 if (mddev
->raid_disks
!= info
->raid_disks
)
6559 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6561 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6562 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6566 if (mddev
->recovery
|| mddev
->sync_thread
) {
6570 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6571 struct bitmap
*bitmap
;
6572 /* add the bitmap */
6573 if (mddev
->bitmap
) {
6577 if (mddev
->bitmap_info
.default_offset
== 0) {
6581 mddev
->bitmap_info
.offset
=
6582 mddev
->bitmap_info
.default_offset
;
6583 mddev
->bitmap_info
.space
=
6584 mddev
->bitmap_info
.default_space
;
6585 mddev
->pers
->quiesce(mddev
, 1);
6586 bitmap
= bitmap_create(mddev
, -1);
6587 if (!IS_ERR(bitmap
)) {
6588 mddev
->bitmap
= bitmap
;
6589 rv
= bitmap_load(mddev
);
6591 rv
= PTR_ERR(bitmap
);
6593 bitmap_destroy(mddev
);
6594 mddev
->pers
->quiesce(mddev
, 0);
6596 /* remove the bitmap */
6597 if (!mddev
->bitmap
) {
6601 if (mddev
->bitmap
->storage
.file
) {
6605 mddev
->pers
->quiesce(mddev
, 1);
6606 bitmap_destroy(mddev
);
6607 mddev
->pers
->quiesce(mddev
, 0);
6608 mddev
->bitmap_info
.offset
= 0;
6611 md_update_sb(mddev
, 1);
6617 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6619 struct md_rdev
*rdev
;
6622 if (mddev
->pers
== NULL
)
6626 rdev
= find_rdev_rcu(mddev
, dev
);
6630 md_error(mddev
, rdev
);
6631 if (!test_bit(Faulty
, &rdev
->flags
))
6639 * We have a problem here : there is no easy way to give a CHS
6640 * virtual geometry. We currently pretend that we have a 2 heads
6641 * 4 sectors (with a BIG number of cylinders...). This drives
6642 * dosfs just mad... ;-)
6644 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6646 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6650 geo
->cylinders
= mddev
->array_sectors
/ 8;
6654 static inline bool md_ioctl_valid(unsigned int cmd
)
6659 case GET_ARRAY_INFO
:
6660 case GET_BITMAP_FILE
:
6663 case HOT_REMOVE_DISK
:
6666 case RESTART_ARRAY_RW
:
6668 case SET_ARRAY_INFO
:
6669 case SET_BITMAP_FILE
:
6670 case SET_DISK_FAULTY
:
6673 case CLUSTERED_DISK_NACK
:
6680 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6681 unsigned int cmd
, unsigned long arg
)
6684 void __user
*argp
= (void __user
*)arg
;
6685 struct mddev
*mddev
= NULL
;
6688 if (!md_ioctl_valid(cmd
))
6693 case GET_ARRAY_INFO
:
6697 if (!capable(CAP_SYS_ADMIN
))
6702 * Commands dealing with the RAID driver but not any
6707 err
= get_version(argp
);
6713 autostart_arrays(arg
);
6720 * Commands creating/starting a new array:
6723 mddev
= bdev
->bd_disk
->private_data
;
6730 /* Some actions do not requires the mutex */
6732 case GET_ARRAY_INFO
:
6733 if (!mddev
->raid_disks
&& !mddev
->external
)
6736 err
= get_array_info(mddev
, argp
);
6740 if (!mddev
->raid_disks
&& !mddev
->external
)
6743 err
= get_disk_info(mddev
, argp
);
6746 case SET_DISK_FAULTY
:
6747 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6750 case GET_BITMAP_FILE
:
6751 err
= get_bitmap_file(mddev
, argp
);
6756 if (cmd
== ADD_NEW_DISK
)
6757 /* need to ensure md_delayed_delete() has completed */
6758 flush_workqueue(md_misc_wq
);
6760 if (cmd
== HOT_REMOVE_DISK
)
6761 /* need to ensure recovery thread has run */
6762 wait_event_interruptible_timeout(mddev
->sb_wait
,
6763 !test_bit(MD_RECOVERY_NEEDED
,
6765 msecs_to_jiffies(5000));
6766 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6767 /* Need to flush page cache, and ensure no-one else opens
6770 mutex_lock(&mddev
->open_mutex
);
6771 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6772 mutex_unlock(&mddev
->open_mutex
);
6776 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6777 mutex_unlock(&mddev
->open_mutex
);
6778 sync_blockdev(bdev
);
6780 err
= mddev_lock(mddev
);
6783 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6788 if (cmd
== SET_ARRAY_INFO
) {
6789 mdu_array_info_t info
;
6791 memset(&info
, 0, sizeof(info
));
6792 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6797 err
= update_array_info(mddev
, &info
);
6799 printk(KERN_WARNING
"md: couldn't update"
6800 " array info. %d\n", err
);
6805 if (!list_empty(&mddev
->disks
)) {
6807 "md: array %s already has disks!\n",
6812 if (mddev
->raid_disks
) {
6814 "md: array %s already initialised!\n",
6819 err
= set_array_info(mddev
, &info
);
6821 printk(KERN_WARNING
"md: couldn't set"
6822 " array info. %d\n", err
);
6829 * Commands querying/configuring an existing array:
6831 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6832 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6833 if ((!mddev
->raid_disks
&& !mddev
->external
)
6834 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6835 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6836 && cmd
!= GET_BITMAP_FILE
) {
6842 * Commands even a read-only array can execute:
6845 case RESTART_ARRAY_RW
:
6846 err
= restart_array(mddev
);
6850 err
= do_md_stop(mddev
, 0, bdev
);
6854 err
= md_set_readonly(mddev
, bdev
);
6857 case HOT_REMOVE_DISK
:
6858 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6862 /* We can support ADD_NEW_DISK on read-only arrays
6863 * on if we are re-adding a preexisting device.
6864 * So require mddev->pers and MD_DISK_SYNC.
6867 mdu_disk_info_t info
;
6868 if (copy_from_user(&info
, argp
, sizeof(info
)))
6870 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6871 /* Need to clear read-only for this */
6874 err
= add_new_disk(mddev
, &info
);
6880 if (get_user(ro
, (int __user
*)(arg
))) {
6886 /* if the bdev is going readonly the value of mddev->ro
6887 * does not matter, no writes are coming
6892 /* are we are already prepared for writes? */
6896 /* transitioning to readauto need only happen for
6897 * arrays that call md_write_start
6900 err
= restart_array(mddev
);
6903 set_disk_ro(mddev
->gendisk
, 0);
6910 * The remaining ioctls are changing the state of the
6911 * superblock, so we do not allow them on read-only arrays.
6913 if (mddev
->ro
&& mddev
->pers
) {
6914 if (mddev
->ro
== 2) {
6916 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6917 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6918 /* mddev_unlock will wake thread */
6919 /* If a device failed while we were read-only, we
6920 * need to make sure the metadata is updated now.
6922 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6923 mddev_unlock(mddev
);
6924 wait_event(mddev
->sb_wait
,
6925 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6926 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6927 mddev_lock_nointr(mddev
);
6938 mdu_disk_info_t info
;
6939 if (copy_from_user(&info
, argp
, sizeof(info
)))
6942 err
= add_new_disk(mddev
, &info
);
6946 case CLUSTERED_DISK_NACK
:
6947 if (mddev_is_clustered(mddev
))
6948 md_cluster_ops
->new_disk_ack(mddev
, false);
6954 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6958 err
= do_md_run(mddev
);
6961 case SET_BITMAP_FILE
:
6962 err
= set_bitmap_file(mddev
, (int)arg
);
6971 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6973 mddev
->hold_active
= 0;
6974 mddev_unlock(mddev
);
6978 #ifdef CONFIG_COMPAT
6979 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6980 unsigned int cmd
, unsigned long arg
)
6983 case HOT_REMOVE_DISK
:
6985 case SET_DISK_FAULTY
:
6986 case SET_BITMAP_FILE
:
6987 /* These take in integer arg, do not convert */
6990 arg
= (unsigned long)compat_ptr(arg
);
6994 return md_ioctl(bdev
, mode
, cmd
, arg
);
6996 #endif /* CONFIG_COMPAT */
6998 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7001 * Succeed if we can lock the mddev, which confirms that
7002 * it isn't being stopped right now.
7004 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7010 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7011 /* we are racing with mddev_put which is discarding this
7015 /* Wait until bdev->bd_disk is definitely gone */
7016 flush_workqueue(md_misc_wq
);
7017 /* Then retry the open from the top */
7018 return -ERESTARTSYS
;
7020 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7022 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7026 atomic_inc(&mddev
->openers
);
7027 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
7028 mutex_unlock(&mddev
->open_mutex
);
7030 check_disk_change(bdev
);
7035 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7037 struct mddev
*mddev
= disk
->private_data
;
7040 atomic_dec(&mddev
->openers
);
7044 static int md_media_changed(struct gendisk
*disk
)
7046 struct mddev
*mddev
= disk
->private_data
;
7048 return mddev
->changed
;
7051 static int md_revalidate(struct gendisk
*disk
)
7053 struct mddev
*mddev
= disk
->private_data
;
7058 static const struct block_device_operations md_fops
=
7060 .owner
= THIS_MODULE
,
7062 .release
= md_release
,
7064 #ifdef CONFIG_COMPAT
7065 .compat_ioctl
= md_compat_ioctl
,
7067 .getgeo
= md_getgeo
,
7068 .media_changed
= md_media_changed
,
7069 .revalidate_disk
= md_revalidate
,
7072 static int md_thread(void *arg
)
7074 struct md_thread
*thread
= arg
;
7077 * md_thread is a 'system-thread', it's priority should be very
7078 * high. We avoid resource deadlocks individually in each
7079 * raid personality. (RAID5 does preallocation) We also use RR and
7080 * the very same RT priority as kswapd, thus we will never get
7081 * into a priority inversion deadlock.
7083 * we definitely have to have equal or higher priority than
7084 * bdflush, otherwise bdflush will deadlock if there are too
7085 * many dirty RAID5 blocks.
7088 allow_signal(SIGKILL
);
7089 while (!kthread_should_stop()) {
7091 /* We need to wait INTERRUPTIBLE so that
7092 * we don't add to the load-average.
7093 * That means we need to be sure no signals are
7096 if (signal_pending(current
))
7097 flush_signals(current
);
7099 wait_event_interruptible_timeout
7101 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7102 || kthread_should_stop(),
7105 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7106 if (!kthread_should_stop())
7107 thread
->run(thread
);
7113 void md_wakeup_thread(struct md_thread
*thread
)
7116 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7117 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7118 wake_up(&thread
->wqueue
);
7121 EXPORT_SYMBOL(md_wakeup_thread
);
7123 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7124 struct mddev
*mddev
, const char *name
)
7126 struct md_thread
*thread
;
7128 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7132 init_waitqueue_head(&thread
->wqueue
);
7135 thread
->mddev
= mddev
;
7136 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7137 thread
->tsk
= kthread_run(md_thread
, thread
,
7139 mdname(thread
->mddev
),
7141 if (IS_ERR(thread
->tsk
)) {
7147 EXPORT_SYMBOL(md_register_thread
);
7149 void md_unregister_thread(struct md_thread
**threadp
)
7151 struct md_thread
*thread
= *threadp
;
7154 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7155 /* Locking ensures that mddev_unlock does not wake_up a
7156 * non-existent thread
7158 spin_lock(&pers_lock
);
7160 spin_unlock(&pers_lock
);
7162 kthread_stop(thread
->tsk
);
7165 EXPORT_SYMBOL(md_unregister_thread
);
7167 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7169 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7172 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7174 mddev
->pers
->error_handler(mddev
,rdev
);
7175 if (mddev
->degraded
)
7176 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7177 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7178 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7179 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7180 md_wakeup_thread(mddev
->thread
);
7181 if (mddev
->event_work
.func
)
7182 queue_work(md_misc_wq
, &mddev
->event_work
);
7183 md_new_event_inintr(mddev
);
7185 EXPORT_SYMBOL(md_error
);
7187 /* seq_file implementation /proc/mdstat */
7189 static void status_unused(struct seq_file
*seq
)
7192 struct md_rdev
*rdev
;
7194 seq_printf(seq
, "unused devices: ");
7196 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7197 char b
[BDEVNAME_SIZE
];
7199 seq_printf(seq
, "%s ",
7200 bdevname(rdev
->bdev
,b
));
7203 seq_printf(seq
, "<none>");
7205 seq_printf(seq
, "\n");
7208 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7210 sector_t max_sectors
, resync
, res
;
7211 unsigned long dt
, db
;
7214 unsigned int per_milli
;
7216 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7217 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7218 max_sectors
= mddev
->resync_max_sectors
;
7220 max_sectors
= mddev
->dev_sectors
;
7222 resync
= mddev
->curr_resync
;
7224 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7225 /* Still cleaning up */
7226 resync
= max_sectors
;
7228 resync
-= atomic_read(&mddev
->recovery_active
);
7231 if (mddev
->recovery_cp
< MaxSector
) {
7232 seq_printf(seq
, "\tresync=PENDING");
7238 seq_printf(seq
, "\tresync=DELAYED");
7242 WARN_ON(max_sectors
== 0);
7243 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7244 * in a sector_t, and (max_sectors>>scale) will fit in a
7245 * u32, as those are the requirements for sector_div.
7246 * Thus 'scale' must be at least 10
7249 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7250 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7253 res
= (resync
>>scale
)*1000;
7254 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7258 int i
, x
= per_milli
/50, y
= 20-x
;
7259 seq_printf(seq
, "[");
7260 for (i
= 0; i
< x
; i
++)
7261 seq_printf(seq
, "=");
7262 seq_printf(seq
, ">");
7263 for (i
= 0; i
< y
; i
++)
7264 seq_printf(seq
, ".");
7265 seq_printf(seq
, "] ");
7267 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7268 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7270 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7272 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7273 "resync" : "recovery"))),
7274 per_milli
/10, per_milli
% 10,
7275 (unsigned long long) resync
/2,
7276 (unsigned long long) max_sectors
/2);
7279 * dt: time from mark until now
7280 * db: blocks written from mark until now
7281 * rt: remaining time
7283 * rt is a sector_t, so could be 32bit or 64bit.
7284 * So we divide before multiply in case it is 32bit and close
7286 * We scale the divisor (db) by 32 to avoid losing precision
7287 * near the end of resync when the number of remaining sectors
7289 * We then divide rt by 32 after multiplying by db to compensate.
7290 * The '+1' avoids division by zero if db is very small.
7292 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7294 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7295 - mddev
->resync_mark_cnt
;
7297 rt
= max_sectors
- resync
; /* number of remaining sectors */
7298 sector_div(rt
, db
/32+1);
7302 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7303 ((unsigned long)rt
% 60)/6);
7305 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7309 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7311 struct list_head
*tmp
;
7313 struct mddev
*mddev
;
7321 spin_lock(&all_mddevs_lock
);
7322 list_for_each(tmp
,&all_mddevs
)
7324 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7326 spin_unlock(&all_mddevs_lock
);
7329 spin_unlock(&all_mddevs_lock
);
7331 return (void*)2;/* tail */
7335 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7337 struct list_head
*tmp
;
7338 struct mddev
*next_mddev
, *mddev
= v
;
7344 spin_lock(&all_mddevs_lock
);
7346 tmp
= all_mddevs
.next
;
7348 tmp
= mddev
->all_mddevs
.next
;
7349 if (tmp
!= &all_mddevs
)
7350 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7352 next_mddev
= (void*)2;
7355 spin_unlock(&all_mddevs_lock
);
7363 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7365 struct mddev
*mddev
= v
;
7367 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7371 static int md_seq_show(struct seq_file
*seq
, void *v
)
7373 struct mddev
*mddev
= v
;
7375 struct md_rdev
*rdev
;
7377 if (v
== (void*)1) {
7378 struct md_personality
*pers
;
7379 seq_printf(seq
, "Personalities : ");
7380 spin_lock(&pers_lock
);
7381 list_for_each_entry(pers
, &pers_list
, list
)
7382 seq_printf(seq
, "[%s] ", pers
->name
);
7384 spin_unlock(&pers_lock
);
7385 seq_printf(seq
, "\n");
7386 seq
->poll_event
= atomic_read(&md_event_count
);
7389 if (v
== (void*)2) {
7394 spin_lock(&mddev
->lock
);
7395 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7396 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7397 mddev
->pers
? "" : "in");
7400 seq_printf(seq
, " (read-only)");
7402 seq_printf(seq
, " (auto-read-only)");
7403 seq_printf(seq
, " %s", mddev
->pers
->name
);
7408 rdev_for_each_rcu(rdev
, mddev
) {
7409 char b
[BDEVNAME_SIZE
];
7410 seq_printf(seq
, " %s[%d]",
7411 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7412 if (test_bit(WriteMostly
, &rdev
->flags
))
7413 seq_printf(seq
, "(W)");
7414 if (test_bit(Journal
, &rdev
->flags
))
7415 seq_printf(seq
, "(J)");
7416 if (test_bit(Faulty
, &rdev
->flags
)) {
7417 seq_printf(seq
, "(F)");
7420 if (rdev
->raid_disk
< 0)
7421 seq_printf(seq
, "(S)"); /* spare */
7422 if (test_bit(Replacement
, &rdev
->flags
))
7423 seq_printf(seq
, "(R)");
7424 sectors
+= rdev
->sectors
;
7428 if (!list_empty(&mddev
->disks
)) {
7430 seq_printf(seq
, "\n %llu blocks",
7431 (unsigned long long)
7432 mddev
->array_sectors
/ 2);
7434 seq_printf(seq
, "\n %llu blocks",
7435 (unsigned long long)sectors
/ 2);
7437 if (mddev
->persistent
) {
7438 if (mddev
->major_version
!= 0 ||
7439 mddev
->minor_version
!= 90) {
7440 seq_printf(seq
," super %d.%d",
7441 mddev
->major_version
,
7442 mddev
->minor_version
);
7444 } else if (mddev
->external
)
7445 seq_printf(seq
, " super external:%s",
7446 mddev
->metadata_type
);
7448 seq_printf(seq
, " super non-persistent");
7451 mddev
->pers
->status(seq
, mddev
);
7452 seq_printf(seq
, "\n ");
7453 if (mddev
->pers
->sync_request
) {
7454 if (status_resync(seq
, mddev
))
7455 seq_printf(seq
, "\n ");
7458 seq_printf(seq
, "\n ");
7460 bitmap_status(seq
, mddev
->bitmap
);
7462 seq_printf(seq
, "\n");
7464 spin_unlock(&mddev
->lock
);
7469 static const struct seq_operations md_seq_ops
= {
7470 .start
= md_seq_start
,
7471 .next
= md_seq_next
,
7472 .stop
= md_seq_stop
,
7473 .show
= md_seq_show
,
7476 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7478 struct seq_file
*seq
;
7481 error
= seq_open(file
, &md_seq_ops
);
7485 seq
= file
->private_data
;
7486 seq
->poll_event
= atomic_read(&md_event_count
);
7490 static int md_unloading
;
7491 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7493 struct seq_file
*seq
= filp
->private_data
;
7497 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7498 poll_wait(filp
, &md_event_waiters
, wait
);
7500 /* always allow read */
7501 mask
= POLLIN
| POLLRDNORM
;
7503 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7504 mask
|= POLLERR
| POLLPRI
;
7508 static const struct file_operations md_seq_fops
= {
7509 .owner
= THIS_MODULE
,
7510 .open
= md_seq_open
,
7512 .llseek
= seq_lseek
,
7513 .release
= seq_release_private
,
7514 .poll
= mdstat_poll
,
7517 int register_md_personality(struct md_personality
*p
)
7519 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7521 spin_lock(&pers_lock
);
7522 list_add_tail(&p
->list
, &pers_list
);
7523 spin_unlock(&pers_lock
);
7526 EXPORT_SYMBOL(register_md_personality
);
7528 int unregister_md_personality(struct md_personality
*p
)
7530 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7531 spin_lock(&pers_lock
);
7532 list_del_init(&p
->list
);
7533 spin_unlock(&pers_lock
);
7536 EXPORT_SYMBOL(unregister_md_personality
);
7538 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7539 struct module
*module
)
7542 spin_lock(&pers_lock
);
7543 if (md_cluster_ops
!= NULL
)
7546 md_cluster_ops
= ops
;
7547 md_cluster_mod
= module
;
7549 spin_unlock(&pers_lock
);
7552 EXPORT_SYMBOL(register_md_cluster_operations
);
7554 int unregister_md_cluster_operations(void)
7556 spin_lock(&pers_lock
);
7557 md_cluster_ops
= NULL
;
7558 spin_unlock(&pers_lock
);
7561 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7563 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7567 err
= request_module("md-cluster");
7569 pr_err("md-cluster module not found.\n");
7573 spin_lock(&pers_lock
);
7574 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7575 spin_unlock(&pers_lock
);
7578 spin_unlock(&pers_lock
);
7580 return md_cluster_ops
->join(mddev
, nodes
);
7583 void md_cluster_stop(struct mddev
*mddev
)
7585 if (!md_cluster_ops
)
7587 md_cluster_ops
->leave(mddev
);
7588 module_put(md_cluster_mod
);
7591 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7593 struct md_rdev
*rdev
;
7599 rdev_for_each_rcu(rdev
, mddev
) {
7600 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7601 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7602 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7603 atomic_read(&disk
->sync_io
);
7604 /* sync IO will cause sync_io to increase before the disk_stats
7605 * as sync_io is counted when a request starts, and
7606 * disk_stats is counted when it completes.
7607 * So resync activity will cause curr_events to be smaller than
7608 * when there was no such activity.
7609 * non-sync IO will cause disk_stat to increase without
7610 * increasing sync_io so curr_events will (eventually)
7611 * be larger than it was before. Once it becomes
7612 * substantially larger, the test below will cause
7613 * the array to appear non-idle, and resync will slow
7615 * If there is a lot of outstanding resync activity when
7616 * we set last_event to curr_events, then all that activity
7617 * completing might cause the array to appear non-idle
7618 * and resync will be slowed down even though there might
7619 * not have been non-resync activity. This will only
7620 * happen once though. 'last_events' will soon reflect
7621 * the state where there is little or no outstanding
7622 * resync requests, and further resync activity will
7623 * always make curr_events less than last_events.
7626 if (init
|| curr_events
- rdev
->last_events
> 64) {
7627 rdev
->last_events
= curr_events
;
7635 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7637 /* another "blocks" (512byte) blocks have been synced */
7638 atomic_sub(blocks
, &mddev
->recovery_active
);
7639 wake_up(&mddev
->recovery_wait
);
7641 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7642 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7643 md_wakeup_thread(mddev
->thread
);
7644 // stop recovery, signal do_sync ....
7647 EXPORT_SYMBOL(md_done_sync
);
7649 /* md_write_start(mddev, bi)
7650 * If we need to update some array metadata (e.g. 'active' flag
7651 * in superblock) before writing, schedule a superblock update
7652 * and wait for it to complete.
7654 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7657 if (bio_data_dir(bi
) != WRITE
)
7660 BUG_ON(mddev
->ro
== 1);
7661 if (mddev
->ro
== 2) {
7662 /* need to switch to read/write */
7664 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7665 md_wakeup_thread(mddev
->thread
);
7666 md_wakeup_thread(mddev
->sync_thread
);
7669 atomic_inc(&mddev
->writes_pending
);
7670 if (mddev
->safemode
== 1)
7671 mddev
->safemode
= 0;
7672 if (mddev
->in_sync
) {
7673 spin_lock(&mddev
->lock
);
7674 if (mddev
->in_sync
) {
7676 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7677 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7678 md_wakeup_thread(mddev
->thread
);
7681 spin_unlock(&mddev
->lock
);
7684 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7685 wait_event(mddev
->sb_wait
,
7686 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7688 EXPORT_SYMBOL(md_write_start
);
7690 void md_write_end(struct mddev
*mddev
)
7692 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7693 if (mddev
->safemode
== 2)
7694 md_wakeup_thread(mddev
->thread
);
7695 else if (mddev
->safemode_delay
)
7696 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7699 EXPORT_SYMBOL(md_write_end
);
7701 /* md_allow_write(mddev)
7702 * Calling this ensures that the array is marked 'active' so that writes
7703 * may proceed without blocking. It is important to call this before
7704 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7705 * Must be called with mddev_lock held.
7707 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7708 * is dropped, so return -EAGAIN after notifying userspace.
7710 int md_allow_write(struct mddev
*mddev
)
7716 if (!mddev
->pers
->sync_request
)
7719 spin_lock(&mddev
->lock
);
7720 if (mddev
->in_sync
) {
7722 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7723 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7724 if (mddev
->safemode_delay
&&
7725 mddev
->safemode
== 0)
7726 mddev
->safemode
= 1;
7727 spin_unlock(&mddev
->lock
);
7728 md_update_sb(mddev
, 0);
7729 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7731 spin_unlock(&mddev
->lock
);
7733 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7738 EXPORT_SYMBOL_GPL(md_allow_write
);
7740 #define SYNC_MARKS 10
7741 #define SYNC_MARK_STEP (3*HZ)
7742 #define UPDATE_FREQUENCY (5*60*HZ)
7743 void md_do_sync(struct md_thread
*thread
)
7745 struct mddev
*mddev
= thread
->mddev
;
7746 struct mddev
*mddev2
;
7747 unsigned int currspeed
= 0,
7749 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7750 unsigned long mark
[SYNC_MARKS
];
7751 unsigned long update_time
;
7752 sector_t mark_cnt
[SYNC_MARKS
];
7754 struct list_head
*tmp
;
7755 sector_t last_check
;
7757 struct md_rdev
*rdev
;
7758 char *desc
, *action
= NULL
;
7759 struct blk_plug plug
;
7760 bool cluster_resync_finished
= false;
7762 /* just incase thread restarts... */
7763 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7765 if (mddev
->ro
) {/* never try to sync a read-only array */
7766 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7770 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7771 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7772 desc
= "data-check";
7774 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7775 desc
= "requested-resync";
7779 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7784 mddev
->last_sync_action
= action
?: desc
;
7786 /* we overload curr_resync somewhat here.
7787 * 0 == not engaged in resync at all
7788 * 2 == checking that there is no conflict with another sync
7789 * 1 == like 2, but have yielded to allow conflicting resync to
7791 * other == active in resync - this many blocks
7793 * Before starting a resync we must have set curr_resync to
7794 * 2, and then checked that every "conflicting" array has curr_resync
7795 * less than ours. When we find one that is the same or higher
7796 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7797 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7798 * This will mean we have to start checking from the beginning again.
7803 mddev
->curr_resync
= 2;
7806 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7808 for_each_mddev(mddev2
, tmp
) {
7809 if (mddev2
== mddev
)
7811 if (!mddev
->parallel_resync
7812 && mddev2
->curr_resync
7813 && match_mddev_units(mddev
, mddev2
)) {
7815 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7816 /* arbitrarily yield */
7817 mddev
->curr_resync
= 1;
7818 wake_up(&resync_wait
);
7820 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7821 /* no need to wait here, we can wait the next
7822 * time 'round when curr_resync == 2
7825 /* We need to wait 'interruptible' so as not to
7826 * contribute to the load average, and not to
7827 * be caught by 'softlockup'
7829 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7830 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7831 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7832 printk(KERN_INFO
"md: delaying %s of %s"
7833 " until %s has finished (they"
7834 " share one or more physical units)\n",
7835 desc
, mdname(mddev
), mdname(mddev2
));
7837 if (signal_pending(current
))
7838 flush_signals(current
);
7840 finish_wait(&resync_wait
, &wq
);
7843 finish_wait(&resync_wait
, &wq
);
7846 } while (mddev
->curr_resync
< 2);
7849 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7850 /* resync follows the size requested by the personality,
7851 * which defaults to physical size, but can be virtual size
7853 max_sectors
= mddev
->resync_max_sectors
;
7854 atomic64_set(&mddev
->resync_mismatches
, 0);
7855 /* we don't use the checkpoint if there's a bitmap */
7856 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7857 j
= mddev
->resync_min
;
7858 else if (!mddev
->bitmap
)
7859 j
= mddev
->recovery_cp
;
7861 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7862 max_sectors
= mddev
->resync_max_sectors
;
7864 /* recovery follows the physical size of devices */
7865 max_sectors
= mddev
->dev_sectors
;
7868 rdev_for_each_rcu(rdev
, mddev
)
7869 if (rdev
->raid_disk
>= 0 &&
7870 !test_bit(Journal
, &rdev
->flags
) &&
7871 !test_bit(Faulty
, &rdev
->flags
) &&
7872 !test_bit(In_sync
, &rdev
->flags
) &&
7873 rdev
->recovery_offset
< j
)
7874 j
= rdev
->recovery_offset
;
7877 /* If there is a bitmap, we need to make sure all
7878 * writes that started before we added a spare
7879 * complete before we start doing a recovery.
7880 * Otherwise the write might complete and (via
7881 * bitmap_endwrite) set a bit in the bitmap after the
7882 * recovery has checked that bit and skipped that
7885 if (mddev
->bitmap
) {
7886 mddev
->pers
->quiesce(mddev
, 1);
7887 mddev
->pers
->quiesce(mddev
, 0);
7891 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7892 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7893 " %d KB/sec/disk.\n", speed_min(mddev
));
7894 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7895 "(but not more than %d KB/sec) for %s.\n",
7896 speed_max(mddev
), desc
);
7898 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7901 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7903 mark_cnt
[m
] = io_sectors
;
7906 mddev
->resync_mark
= mark
[last_mark
];
7907 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7910 * Tune reconstruction:
7912 window
= 32*(PAGE_SIZE
/512);
7913 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7914 window
/2, (unsigned long long)max_sectors
/2);
7916 atomic_set(&mddev
->recovery_active
, 0);
7921 "md: resuming %s of %s from checkpoint.\n",
7922 desc
, mdname(mddev
));
7923 mddev
->curr_resync
= j
;
7925 mddev
->curr_resync
= 3; /* no longer delayed */
7926 mddev
->curr_resync_completed
= j
;
7927 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7928 md_new_event(mddev
);
7929 update_time
= jiffies
;
7931 blk_start_plug(&plug
);
7932 while (j
< max_sectors
) {
7937 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7938 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7939 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7940 > (max_sectors
>> 4)) ||
7941 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7942 (j
- mddev
->curr_resync_completed
)*2
7943 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
7944 mddev
->curr_resync_completed
> mddev
->resync_max
7946 /* time to update curr_resync_completed */
7947 wait_event(mddev
->recovery_wait
,
7948 atomic_read(&mddev
->recovery_active
) == 0);
7949 mddev
->curr_resync_completed
= j
;
7950 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7951 j
> mddev
->recovery_cp
)
7952 mddev
->recovery_cp
= j
;
7953 update_time
= jiffies
;
7954 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7955 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7958 while (j
>= mddev
->resync_max
&&
7959 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7960 /* As this condition is controlled by user-space,
7961 * we can block indefinitely, so use '_interruptible'
7962 * to avoid triggering warnings.
7964 flush_signals(current
); /* just in case */
7965 wait_event_interruptible(mddev
->recovery_wait
,
7966 mddev
->resync_max
> j
7967 || test_bit(MD_RECOVERY_INTR
,
7971 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7974 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
7976 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7980 if (!skipped
) { /* actual IO requested */
7981 io_sectors
+= sectors
;
7982 atomic_add(sectors
, &mddev
->recovery_active
);
7985 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7989 if (j
> max_sectors
)
7990 /* when skipping, extra large numbers can be returned. */
7993 mddev
->curr_resync
= j
;
7994 mddev
->curr_mark_cnt
= io_sectors
;
7995 if (last_check
== 0)
7996 /* this is the earliest that rebuild will be
7997 * visible in /proc/mdstat
7999 md_new_event(mddev
);
8001 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8004 last_check
= io_sectors
;
8006 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8008 int next
= (last_mark
+1) % SYNC_MARKS
;
8010 mddev
->resync_mark
= mark
[next
];
8011 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8012 mark
[next
] = jiffies
;
8013 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8017 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8021 * this loop exits only if either when we are slower than
8022 * the 'hard' speed limit, or the system was IO-idle for
8024 * the system might be non-idle CPU-wise, but we only care
8025 * about not overloading the IO subsystem. (things like an
8026 * e2fsck being done on the RAID array should execute fast)
8030 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8031 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8032 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8034 if (currspeed
> speed_min(mddev
)) {
8035 if (currspeed
> speed_max(mddev
)) {
8039 if (!is_mddev_idle(mddev
, 0)) {
8041 * Give other IO more of a chance.
8042 * The faster the devices, the less we wait.
8044 wait_event(mddev
->recovery_wait
,
8045 !atomic_read(&mddev
->recovery_active
));
8049 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
8050 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8051 ? "interrupted" : "done");
8053 * this also signals 'finished resyncing' to md_stop
8055 blk_finish_plug(&plug
);
8056 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8058 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8059 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8060 mddev
->curr_resync
> 2) {
8061 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8062 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8064 /* tell personality and other nodes that we are finished */
8065 if (mddev_is_clustered(mddev
)) {
8066 md_cluster_ops
->resync_finish(mddev
);
8067 cluster_resync_finished
= true;
8069 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8071 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8072 mddev
->curr_resync
> 2) {
8073 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8074 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8075 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8077 "md: checkpointing %s of %s.\n",
8078 desc
, mdname(mddev
));
8079 if (test_bit(MD_RECOVERY_ERROR
,
8081 mddev
->recovery_cp
=
8082 mddev
->curr_resync_completed
;
8084 mddev
->recovery_cp
=
8088 mddev
->recovery_cp
= MaxSector
;
8090 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8091 mddev
->curr_resync
= MaxSector
;
8093 rdev_for_each_rcu(rdev
, mddev
)
8094 if (rdev
->raid_disk
>= 0 &&
8095 mddev
->delta_disks
>= 0 &&
8096 !test_bit(Journal
, &rdev
->flags
) &&
8097 !test_bit(Faulty
, &rdev
->flags
) &&
8098 !test_bit(In_sync
, &rdev
->flags
) &&
8099 rdev
->recovery_offset
< mddev
->curr_resync
)
8100 rdev
->recovery_offset
= mddev
->curr_resync
;
8105 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8107 if (mddev_is_clustered(mddev
) &&
8108 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8109 !cluster_resync_finished
)
8110 md_cluster_ops
->resync_finish(mddev
);
8112 spin_lock(&mddev
->lock
);
8113 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8114 /* We completed so min/max setting can be forgotten if used. */
8115 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8116 mddev
->resync_min
= 0;
8117 mddev
->resync_max
= MaxSector
;
8118 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8119 mddev
->resync_min
= mddev
->curr_resync_completed
;
8120 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8121 mddev
->curr_resync
= 0;
8122 spin_unlock(&mddev
->lock
);
8124 wake_up(&resync_wait
);
8125 md_wakeup_thread(mddev
->thread
);
8128 EXPORT_SYMBOL_GPL(md_do_sync
);
8130 static int remove_and_add_spares(struct mddev
*mddev
,
8131 struct md_rdev
*this)
8133 struct md_rdev
*rdev
;
8137 rdev_for_each(rdev
, mddev
)
8138 if ((this == NULL
|| rdev
== this) &&
8139 rdev
->raid_disk
>= 0 &&
8140 !test_bit(Blocked
, &rdev
->flags
) &&
8141 (test_bit(Faulty
, &rdev
->flags
) ||
8142 (!test_bit(In_sync
, &rdev
->flags
) &&
8143 !test_bit(Journal
, &rdev
->flags
))) &&
8144 atomic_read(&rdev
->nr_pending
)==0) {
8145 if (mddev
->pers
->hot_remove_disk(
8146 mddev
, rdev
) == 0) {
8147 sysfs_unlink_rdev(mddev
, rdev
);
8148 rdev
->raid_disk
= -1;
8152 if (removed
&& mddev
->kobj
.sd
)
8153 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8155 if (this && removed
)
8158 rdev_for_each(rdev
, mddev
) {
8159 if (this && this != rdev
)
8161 if (test_bit(Candidate
, &rdev
->flags
))
8163 if (rdev
->raid_disk
>= 0 &&
8164 !test_bit(In_sync
, &rdev
->flags
) &&
8165 !test_bit(Journal
, &rdev
->flags
) &&
8166 !test_bit(Faulty
, &rdev
->flags
))
8168 if (rdev
->raid_disk
>= 0)
8170 if (test_bit(Faulty
, &rdev
->flags
))
8172 if (test_bit(Journal
, &rdev
->flags
))
8175 ! (rdev
->saved_raid_disk
>= 0 &&
8176 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8179 rdev
->recovery_offset
= 0;
8181 hot_add_disk(mddev
, rdev
) == 0) {
8182 if (sysfs_link_rdev(mddev
, rdev
))
8183 /* failure here is OK */;
8185 md_new_event(mddev
);
8186 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8191 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8195 static void md_start_sync(struct work_struct
*ws
)
8197 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8200 if (mddev_is_clustered(mddev
)) {
8201 ret
= md_cluster_ops
->resync_start(mddev
);
8203 mddev
->sync_thread
= NULL
;
8208 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8212 if (!mddev
->sync_thread
) {
8213 if (!(mddev_is_clustered(mddev
) && ret
== -EAGAIN
))
8214 printk(KERN_ERR
"%s: could not start resync"
8217 /* leave the spares where they are, it shouldn't hurt */
8218 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8219 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8220 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8221 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8222 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8223 wake_up(&resync_wait
);
8224 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8226 if (mddev
->sysfs_action
)
8227 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8229 md_wakeup_thread(mddev
->sync_thread
);
8230 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8231 md_new_event(mddev
);
8235 * This routine is regularly called by all per-raid-array threads to
8236 * deal with generic issues like resync and super-block update.
8237 * Raid personalities that don't have a thread (linear/raid0) do not
8238 * need this as they never do any recovery or update the superblock.
8240 * It does not do any resync itself, but rather "forks" off other threads
8241 * to do that as needed.
8242 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8243 * "->recovery" and create a thread at ->sync_thread.
8244 * When the thread finishes it sets MD_RECOVERY_DONE
8245 * and wakeups up this thread which will reap the thread and finish up.
8246 * This thread also removes any faulty devices (with nr_pending == 0).
8248 * The overall approach is:
8249 * 1/ if the superblock needs updating, update it.
8250 * 2/ If a recovery thread is running, don't do anything else.
8251 * 3/ If recovery has finished, clean up, possibly marking spares active.
8252 * 4/ If there are any faulty devices, remove them.
8253 * 5/ If array is degraded, try to add spares devices
8254 * 6/ If array has spares or is not in-sync, start a resync thread.
8256 void md_check_recovery(struct mddev
*mddev
)
8258 if (mddev
->suspended
)
8262 bitmap_daemon_work(mddev
);
8264 if (signal_pending(current
)) {
8265 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8266 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8268 mddev
->safemode
= 2;
8270 flush_signals(current
);
8273 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8276 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8277 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8278 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8279 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8280 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8281 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8285 if (mddev_trylock(mddev
)) {
8289 struct md_rdev
*rdev
;
8290 if (!mddev
->external
&& mddev
->in_sync
)
8291 /* 'Blocked' flag not needed as failed devices
8292 * will be recorded if array switched to read/write.
8293 * Leaving it set will prevent the device
8294 * from being removed.
8296 rdev_for_each(rdev
, mddev
)
8297 clear_bit(Blocked
, &rdev
->flags
);
8298 /* On a read-only array we can:
8299 * - remove failed devices
8300 * - add already-in_sync devices if the array itself
8302 * As we only add devices that are already in-sync,
8303 * we can activate the spares immediately.
8305 remove_and_add_spares(mddev
, NULL
);
8306 /* There is no thread, but we need to call
8307 * ->spare_active and clear saved_raid_disk
8309 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8310 md_reap_sync_thread(mddev
);
8311 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8312 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8313 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8317 if (!mddev
->external
) {
8319 spin_lock(&mddev
->lock
);
8320 if (mddev
->safemode
&&
8321 !atomic_read(&mddev
->writes_pending
) &&
8323 mddev
->recovery_cp
== MaxSector
) {
8326 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8328 if (mddev
->safemode
== 1)
8329 mddev
->safemode
= 0;
8330 spin_unlock(&mddev
->lock
);
8332 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8335 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
8336 md_update_sb(mddev
, 0);
8338 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8339 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8340 /* resync/recovery still happening */
8341 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8344 if (mddev
->sync_thread
) {
8345 md_reap_sync_thread(mddev
);
8348 /* Set RUNNING before clearing NEEDED to avoid
8349 * any transients in the value of "sync_action".
8351 mddev
->curr_resync_completed
= 0;
8352 spin_lock(&mddev
->lock
);
8353 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8354 spin_unlock(&mddev
->lock
);
8355 /* Clear some bits that don't mean anything, but
8358 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8359 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8361 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8362 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8364 /* no recovery is running.
8365 * remove any failed drives, then
8366 * add spares if possible.
8367 * Spares are also removed and re-added, to allow
8368 * the personality to fail the re-add.
8371 if (mddev
->reshape_position
!= MaxSector
) {
8372 if (mddev
->pers
->check_reshape
== NULL
||
8373 mddev
->pers
->check_reshape(mddev
) != 0)
8374 /* Cannot proceed */
8376 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8377 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8378 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8379 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8380 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8381 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8382 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8383 } else if (mddev
->recovery_cp
< MaxSector
) {
8384 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8385 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8386 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8387 /* nothing to be done ... */
8390 if (mddev
->pers
->sync_request
) {
8392 /* We are adding a device or devices to an array
8393 * which has the bitmap stored on all devices.
8394 * So make sure all bitmap pages get written
8396 bitmap_write_all(mddev
->bitmap
);
8398 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8399 queue_work(md_misc_wq
, &mddev
->del_work
);
8403 if (!mddev
->sync_thread
) {
8404 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8405 wake_up(&resync_wait
);
8406 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8408 if (mddev
->sysfs_action
)
8409 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8412 wake_up(&mddev
->sb_wait
);
8413 mddev_unlock(mddev
);
8416 EXPORT_SYMBOL(md_check_recovery
);
8418 void md_reap_sync_thread(struct mddev
*mddev
)
8420 struct md_rdev
*rdev
;
8422 /* resync has finished, collect result */
8423 md_unregister_thread(&mddev
->sync_thread
);
8424 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8425 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8427 /* activate any spares */
8428 if (mddev
->pers
->spare_active(mddev
)) {
8429 sysfs_notify(&mddev
->kobj
, NULL
,
8431 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8434 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8435 mddev
->pers
->finish_reshape
)
8436 mddev
->pers
->finish_reshape(mddev
);
8438 /* If array is no-longer degraded, then any saved_raid_disk
8439 * information must be scrapped.
8441 if (!mddev
->degraded
)
8442 rdev_for_each(rdev
, mddev
)
8443 rdev
->saved_raid_disk
= -1;
8445 md_update_sb(mddev
, 1);
8446 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8447 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8448 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8449 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8450 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8451 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8452 wake_up(&resync_wait
);
8453 /* flag recovery needed just to double check */
8454 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8455 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8456 md_new_event(mddev
);
8457 if (mddev
->event_work
.func
)
8458 queue_work(md_misc_wq
, &mddev
->event_work
);
8460 EXPORT_SYMBOL(md_reap_sync_thread
);
8462 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8464 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8465 wait_event_timeout(rdev
->blocked_wait
,
8466 !test_bit(Blocked
, &rdev
->flags
) &&
8467 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8468 msecs_to_jiffies(5000));
8469 rdev_dec_pending(rdev
, mddev
);
8471 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8473 void md_finish_reshape(struct mddev
*mddev
)
8475 /* called be personality module when reshape completes. */
8476 struct md_rdev
*rdev
;
8478 rdev_for_each(rdev
, mddev
) {
8479 if (rdev
->data_offset
> rdev
->new_data_offset
)
8480 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8482 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8483 rdev
->data_offset
= rdev
->new_data_offset
;
8486 EXPORT_SYMBOL(md_finish_reshape
);
8488 /* Bad block management */
8490 /* Returns 1 on success, 0 on failure */
8491 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8496 s
+= rdev
->new_data_offset
;
8498 s
+= rdev
->data_offset
;
8499 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8501 /* Make sure they get written out promptly */
8502 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8503 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8504 set_bit(MD_CHANGE_PENDING
, &rdev
->mddev
->flags
);
8505 md_wakeup_thread(rdev
->mddev
->thread
);
8510 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8512 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8516 s
+= rdev
->new_data_offset
;
8518 s
+= rdev
->data_offset
;
8519 return badblocks_clear(&rdev
->badblocks
,
8522 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8524 static int md_notify_reboot(struct notifier_block
*this,
8525 unsigned long code
, void *x
)
8527 struct list_head
*tmp
;
8528 struct mddev
*mddev
;
8531 for_each_mddev(mddev
, tmp
) {
8532 if (mddev_trylock(mddev
)) {
8534 __md_stop_writes(mddev
);
8535 if (mddev
->persistent
)
8536 mddev
->safemode
= 2;
8537 mddev_unlock(mddev
);
8542 * certain more exotic SCSI devices are known to be
8543 * volatile wrt too early system reboots. While the
8544 * right place to handle this issue is the given
8545 * driver, we do want to have a safe RAID driver ...
8553 static struct notifier_block md_notifier
= {
8554 .notifier_call
= md_notify_reboot
,
8556 .priority
= INT_MAX
, /* before any real devices */
8559 static void md_geninit(void)
8561 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8563 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8566 static int __init
md_init(void)
8570 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8574 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8578 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8581 if ((ret
= register_blkdev(0, "mdp")) < 0)
8585 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8586 md_probe
, NULL
, NULL
);
8587 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8588 md_probe
, NULL
, NULL
);
8590 register_reboot_notifier(&md_notifier
);
8591 raid_table_header
= register_sysctl_table(raid_root_table
);
8597 unregister_blkdev(MD_MAJOR
, "md");
8599 destroy_workqueue(md_misc_wq
);
8601 destroy_workqueue(md_wq
);
8606 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8608 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8609 struct md_rdev
*rdev2
;
8611 char b
[BDEVNAME_SIZE
];
8613 /* Check for change of roles in the active devices */
8614 rdev_for_each(rdev2
, mddev
) {
8615 if (test_bit(Faulty
, &rdev2
->flags
))
8618 /* Check if the roles changed */
8619 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8621 if (test_bit(Candidate
, &rdev2
->flags
)) {
8622 if (role
== 0xfffe) {
8623 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
8624 md_kick_rdev_from_array(rdev2
);
8628 clear_bit(Candidate
, &rdev2
->flags
);
8631 if (role
!= rdev2
->raid_disk
) {
8633 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8634 rdev2
->saved_raid_disk
= role
;
8635 ret
= remove_and_add_spares(mddev
, rdev2
);
8636 pr_info("Activated spare: %s\n",
8637 bdevname(rdev2
->bdev
,b
));
8641 * We just want to do the minimum to mark the disk
8642 * as faulty. The recovery is performed by the
8643 * one who initiated the error.
8645 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8646 md_error(mddev
, rdev2
);
8647 clear_bit(Blocked
, &rdev2
->flags
);
8652 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
8653 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
8655 /* Finally set the event to be up to date */
8656 mddev
->events
= le64_to_cpu(sb
->events
);
8659 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8662 struct page
*swapout
= rdev
->sb_page
;
8663 struct mdp_superblock_1
*sb
;
8665 /* Store the sb page of the rdev in the swapout temporary
8666 * variable in case we err in the future
8668 rdev
->sb_page
= NULL
;
8669 alloc_disk_sb(rdev
);
8670 ClearPageUptodate(rdev
->sb_page
);
8671 rdev
->sb_loaded
= 0;
8672 err
= super_types
[mddev
->major_version
].load_super(rdev
, NULL
, mddev
->minor_version
);
8675 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8676 __func__
, __LINE__
, rdev
->desc_nr
, err
);
8677 put_page(rdev
->sb_page
);
8678 rdev
->sb_page
= swapout
;
8679 rdev
->sb_loaded
= 1;
8683 sb
= page_address(rdev
->sb_page
);
8684 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8688 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
8689 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
8691 /* The other node finished recovery, call spare_active to set
8692 * device In_sync and mddev->degraded
8694 if (rdev
->recovery_offset
== MaxSector
&&
8695 !test_bit(In_sync
, &rdev
->flags
) &&
8696 mddev
->pers
->spare_active(mddev
))
8697 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8703 void md_reload_sb(struct mddev
*mddev
, int nr
)
8705 struct md_rdev
*rdev
;
8709 rdev_for_each_rcu(rdev
, mddev
) {
8710 if (rdev
->desc_nr
== nr
)
8714 if (!rdev
|| rdev
->desc_nr
!= nr
) {
8715 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
8719 err
= read_rdev(mddev
, rdev
);
8723 check_sb_changes(mddev
, rdev
);
8725 /* Read all rdev's to update recovery_offset */
8726 rdev_for_each_rcu(rdev
, mddev
)
8727 read_rdev(mddev
, rdev
);
8729 EXPORT_SYMBOL(md_reload_sb
);
8734 * Searches all registered partitions for autorun RAID arrays
8738 static LIST_HEAD(all_detected_devices
);
8739 struct detected_devices_node
{
8740 struct list_head list
;
8744 void md_autodetect_dev(dev_t dev
)
8746 struct detected_devices_node
*node_detected_dev
;
8748 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8749 if (node_detected_dev
) {
8750 node_detected_dev
->dev
= dev
;
8751 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8753 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8754 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8758 static void autostart_arrays(int part
)
8760 struct md_rdev
*rdev
;
8761 struct detected_devices_node
*node_detected_dev
;
8763 int i_scanned
, i_passed
;
8768 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8770 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8772 node_detected_dev
= list_entry(all_detected_devices
.next
,
8773 struct detected_devices_node
, list
);
8774 list_del(&node_detected_dev
->list
);
8775 dev
= node_detected_dev
->dev
;
8776 kfree(node_detected_dev
);
8777 rdev
= md_import_device(dev
,0, 90);
8781 if (test_bit(Faulty
, &rdev
->flags
))
8784 set_bit(AutoDetected
, &rdev
->flags
);
8785 list_add(&rdev
->same_set
, &pending_raid_disks
);
8789 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8790 i_scanned
, i_passed
);
8792 autorun_devices(part
);
8795 #endif /* !MODULE */
8797 static __exit
void md_exit(void)
8799 struct mddev
*mddev
;
8800 struct list_head
*tmp
;
8803 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8804 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8806 unregister_blkdev(MD_MAJOR
,"md");
8807 unregister_blkdev(mdp_major
, "mdp");
8808 unregister_reboot_notifier(&md_notifier
);
8809 unregister_sysctl_table(raid_table_header
);
8811 /* We cannot unload the modules while some process is
8812 * waiting for us in select() or poll() - wake them up
8815 while (waitqueue_active(&md_event_waiters
)) {
8816 /* not safe to leave yet */
8817 wake_up(&md_event_waiters
);
8821 remove_proc_entry("mdstat", NULL
);
8823 for_each_mddev(mddev
, tmp
) {
8824 export_array(mddev
);
8825 mddev
->hold_active
= 0;
8827 destroy_workqueue(md_misc_wq
);
8828 destroy_workqueue(md_wq
);
8831 subsys_initcall(md_init
);
8832 module_exit(md_exit
)
8834 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8836 return sprintf(buffer
, "%d", start_readonly
);
8838 static int set_ro(const char *val
, struct kernel_param
*kp
)
8840 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
8843 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8844 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8845 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8847 MODULE_LICENSE("GPL");
8848 MODULE_DESCRIPTION("MD RAID framework");
8850 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);