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
);
210 * Enables to iterate over all existing md arrays
211 * all_mddevs_lock protects this list.
213 static LIST_HEAD(all_mddevs
);
214 static DEFINE_SPINLOCK(all_mddevs_lock
);
217 * iterates through all used mddevs in the system.
218 * We take care to grab the all_mddevs_lock whenever navigating
219 * the list, and to always hold a refcount when unlocked.
220 * Any code which breaks out of this loop while own
221 * a reference to the current mddev and must mddev_put it.
223 #define for_each_mddev(_mddev,_tmp) \
225 for (({ spin_lock(&all_mddevs_lock); \
226 _tmp = all_mddevs.next; \
228 ({ if (_tmp != &all_mddevs) \
229 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
230 spin_unlock(&all_mddevs_lock); \
231 if (_mddev) mddev_put(_mddev); \
232 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
233 _tmp != &all_mddevs;}); \
234 ({ spin_lock(&all_mddevs_lock); \
235 _tmp = _tmp->next;}) \
238 /* Rather than calling directly into the personality make_request function,
239 * IO requests come here first so that we can check if the device is
240 * being suspended pending a reconfiguration.
241 * We hold a refcount over the call to ->make_request. By the time that
242 * call has finished, the bio has been linked into some internal structure
243 * and so is visible to ->quiesce(), so we don't need the refcount any more.
245 static blk_qc_t
md_make_request(struct request_queue
*q
, struct bio
*bio
)
247 const int rw
= bio_data_dir(bio
);
248 struct mddev
*mddev
= q
->queuedata
;
249 unsigned int sectors
;
252 blk_queue_split(q
, &bio
, q
->bio_split
);
254 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
256 return BLK_QC_T_NONE
;
258 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
259 if (bio_sectors(bio
) != 0)
260 bio
->bi_error
= -EROFS
;
262 return BLK_QC_T_NONE
;
264 smp_rmb(); /* Ensure implications of 'active' are visible */
266 if (mddev
->suspended
) {
269 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
270 TASK_UNINTERRUPTIBLE
);
271 if (!mddev
->suspended
)
277 finish_wait(&mddev
->sb_wait
, &__wait
);
279 atomic_inc(&mddev
->active_io
);
283 * save the sectors now since our bio can
284 * go away inside make_request
286 sectors
= bio_sectors(bio
);
287 /* bio could be mergeable after passing to underlayer */
288 bio
->bi_rw
&= ~REQ_NOMERGE
;
289 mddev
->pers
->make_request(mddev
, bio
);
291 cpu
= part_stat_lock();
292 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
293 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
296 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
297 wake_up(&mddev
->sb_wait
);
299 return BLK_QC_T_NONE
;
302 /* mddev_suspend makes sure no new requests are submitted
303 * to the device, and that any requests that have been submitted
304 * are completely handled.
305 * Once mddev_detach() is called and completes, the module will be
308 void mddev_suspend(struct mddev
*mddev
)
310 WARN_ON_ONCE(mddev
->thread
&& current
== mddev
->thread
->tsk
);
311 if (mddev
->suspended
++)
314 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
315 mddev
->pers
->quiesce(mddev
, 1);
317 del_timer_sync(&mddev
->safemode_timer
);
319 EXPORT_SYMBOL_GPL(mddev_suspend
);
321 void mddev_resume(struct mddev
*mddev
)
323 if (--mddev
->suspended
)
325 wake_up(&mddev
->sb_wait
);
326 mddev
->pers
->quiesce(mddev
, 0);
328 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
329 md_wakeup_thread(mddev
->thread
);
330 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
332 EXPORT_SYMBOL_GPL(mddev_resume
);
334 int mddev_congested(struct mddev
*mddev
, int bits
)
336 struct md_personality
*pers
= mddev
->pers
;
340 if (mddev
->suspended
)
342 else if (pers
&& pers
->congested
)
343 ret
= pers
->congested(mddev
, bits
);
347 EXPORT_SYMBOL_GPL(mddev_congested
);
348 static int md_congested(void *data
, int bits
)
350 struct mddev
*mddev
= data
;
351 return mddev_congested(mddev
, bits
);
355 * Generic flush handling for md
358 static void md_end_flush(struct bio
*bio
)
360 struct md_rdev
*rdev
= bio
->bi_private
;
361 struct mddev
*mddev
= rdev
->mddev
;
363 rdev_dec_pending(rdev
, mddev
);
365 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
366 /* The pre-request flush has finished */
367 queue_work(md_wq
, &mddev
->flush_work
);
372 static void md_submit_flush_data(struct work_struct
*ws
);
374 static void submit_flushes(struct work_struct
*ws
)
376 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
377 struct md_rdev
*rdev
;
379 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
380 atomic_set(&mddev
->flush_pending
, 1);
382 rdev_for_each_rcu(rdev
, mddev
)
383 if (rdev
->raid_disk
>= 0 &&
384 !test_bit(Faulty
, &rdev
->flags
)) {
385 /* Take two references, one is dropped
386 * when request finishes, one after
387 * we reclaim rcu_read_lock
390 atomic_inc(&rdev
->nr_pending
);
391 atomic_inc(&rdev
->nr_pending
);
393 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
394 bi
->bi_end_io
= md_end_flush
;
395 bi
->bi_private
= rdev
;
396 bi
->bi_bdev
= rdev
->bdev
;
397 bi
->bi_rw
= WRITE_FLUSH
;
398 atomic_inc(&mddev
->flush_pending
);
401 rdev_dec_pending(rdev
, mddev
);
404 if (atomic_dec_and_test(&mddev
->flush_pending
))
405 queue_work(md_wq
, &mddev
->flush_work
);
408 static void md_submit_flush_data(struct work_struct
*ws
)
410 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
411 struct bio
*bio
= mddev
->flush_bio
;
413 if (bio
->bi_iter
.bi_size
== 0)
414 /* an empty barrier - all done */
417 bio
->bi_rw
&= ~REQ_FLUSH
;
418 mddev
->pers
->make_request(mddev
, bio
);
421 mddev
->flush_bio
= NULL
;
422 wake_up(&mddev
->sb_wait
);
425 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
427 spin_lock_irq(&mddev
->lock
);
428 wait_event_lock_irq(mddev
->sb_wait
,
431 mddev
->flush_bio
= bio
;
432 spin_unlock_irq(&mddev
->lock
);
434 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
435 queue_work(md_wq
, &mddev
->flush_work
);
437 EXPORT_SYMBOL(md_flush_request
);
439 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
441 struct mddev
*mddev
= cb
->data
;
442 md_wakeup_thread(mddev
->thread
);
445 EXPORT_SYMBOL(md_unplug
);
447 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
449 atomic_inc(&mddev
->active
);
453 static void mddev_delayed_delete(struct work_struct
*ws
);
455 static void mddev_put(struct mddev
*mddev
)
457 struct bio_set
*bs
= NULL
;
459 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
461 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
462 mddev
->ctime
== 0 && !mddev
->hold_active
) {
463 /* Array is not configured at all, and not held active,
465 list_del_init(&mddev
->all_mddevs
);
467 mddev
->bio_set
= NULL
;
468 if (mddev
->gendisk
) {
469 /* We did a probe so need to clean up. Call
470 * queue_work inside the spinlock so that
471 * flush_workqueue() after mddev_find will
472 * succeed in waiting for the work to be done.
474 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
475 queue_work(md_misc_wq
, &mddev
->del_work
);
479 spin_unlock(&all_mddevs_lock
);
484 static void md_safemode_timeout(unsigned long data
);
486 void mddev_init(struct mddev
*mddev
)
488 mutex_init(&mddev
->open_mutex
);
489 mutex_init(&mddev
->reconfig_mutex
);
490 mutex_init(&mddev
->bitmap_info
.mutex
);
491 INIT_LIST_HEAD(&mddev
->disks
);
492 INIT_LIST_HEAD(&mddev
->all_mddevs
);
493 setup_timer(&mddev
->safemode_timer
, md_safemode_timeout
,
494 (unsigned long) mddev
);
495 atomic_set(&mddev
->active
, 1);
496 atomic_set(&mddev
->openers
, 0);
497 atomic_set(&mddev
->active_io
, 0);
498 spin_lock_init(&mddev
->lock
);
499 atomic_set(&mddev
->flush_pending
, 0);
500 init_waitqueue_head(&mddev
->sb_wait
);
501 init_waitqueue_head(&mddev
->recovery_wait
);
502 mddev
->reshape_position
= MaxSector
;
503 mddev
->reshape_backwards
= 0;
504 mddev
->last_sync_action
= "none";
505 mddev
->resync_min
= 0;
506 mddev
->resync_max
= MaxSector
;
507 mddev
->level
= LEVEL_NONE
;
509 EXPORT_SYMBOL_GPL(mddev_init
);
511 static struct mddev
*mddev_find(dev_t unit
)
513 struct mddev
*mddev
, *new = NULL
;
515 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
516 unit
&= ~((1<<MdpMinorShift
)-1);
519 spin_lock(&all_mddevs_lock
);
522 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
523 if (mddev
->unit
== unit
) {
525 spin_unlock(&all_mddevs_lock
);
531 list_add(&new->all_mddevs
, &all_mddevs
);
532 spin_unlock(&all_mddevs_lock
);
533 new->hold_active
= UNTIL_IOCTL
;
537 /* find an unused unit number */
538 static int next_minor
= 512;
539 int start
= next_minor
;
543 dev
= MKDEV(MD_MAJOR
, next_minor
);
545 if (next_minor
> MINORMASK
)
547 if (next_minor
== start
) {
548 /* Oh dear, all in use. */
549 spin_unlock(&all_mddevs_lock
);
555 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
556 if (mddev
->unit
== dev
) {
562 new->md_minor
= MINOR(dev
);
563 new->hold_active
= UNTIL_STOP
;
564 list_add(&new->all_mddevs
, &all_mddevs
);
565 spin_unlock(&all_mddevs_lock
);
568 spin_unlock(&all_mddevs_lock
);
570 new = kzalloc(sizeof(*new), GFP_KERNEL
);
575 if (MAJOR(unit
) == MD_MAJOR
)
576 new->md_minor
= MINOR(unit
);
578 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
585 static struct attribute_group md_redundancy_group
;
587 void mddev_unlock(struct mddev
*mddev
)
589 if (mddev
->to_remove
) {
590 /* These cannot be removed under reconfig_mutex as
591 * an access to the files will try to take reconfig_mutex
592 * while holding the file unremovable, which leads to
594 * So hold set sysfs_active while the remove in happeing,
595 * and anything else which might set ->to_remove or my
596 * otherwise change the sysfs namespace will fail with
597 * -EBUSY if sysfs_active is still set.
598 * We set sysfs_active under reconfig_mutex and elsewhere
599 * test it under the same mutex to ensure its correct value
602 struct attribute_group
*to_remove
= mddev
->to_remove
;
603 mddev
->to_remove
= NULL
;
604 mddev
->sysfs_active
= 1;
605 mutex_unlock(&mddev
->reconfig_mutex
);
607 if (mddev
->kobj
.sd
) {
608 if (to_remove
!= &md_redundancy_group
)
609 sysfs_remove_group(&mddev
->kobj
, to_remove
);
610 if (mddev
->pers
== NULL
||
611 mddev
->pers
->sync_request
== NULL
) {
612 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
613 if (mddev
->sysfs_action
)
614 sysfs_put(mddev
->sysfs_action
);
615 mddev
->sysfs_action
= NULL
;
618 mddev
->sysfs_active
= 0;
620 mutex_unlock(&mddev
->reconfig_mutex
);
622 /* As we've dropped the mutex we need a spinlock to
623 * make sure the thread doesn't disappear
625 spin_lock(&pers_lock
);
626 md_wakeup_thread(mddev
->thread
);
627 spin_unlock(&pers_lock
);
629 EXPORT_SYMBOL_GPL(mddev_unlock
);
631 struct md_rdev
*md_find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
633 struct md_rdev
*rdev
;
635 rdev_for_each_rcu(rdev
, mddev
)
636 if (rdev
->desc_nr
== nr
)
641 EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu
);
643 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
645 struct md_rdev
*rdev
;
647 rdev_for_each(rdev
, mddev
)
648 if (rdev
->bdev
->bd_dev
== dev
)
654 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
656 struct md_rdev
*rdev
;
658 rdev_for_each_rcu(rdev
, mddev
)
659 if (rdev
->bdev
->bd_dev
== dev
)
665 static struct md_personality
*find_pers(int level
, char *clevel
)
667 struct md_personality
*pers
;
668 list_for_each_entry(pers
, &pers_list
, list
) {
669 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
671 if (strcmp(pers
->name
, clevel
)==0)
677 /* return the offset of the super block in 512byte sectors */
678 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
680 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
681 return MD_NEW_SIZE_SECTORS(num_sectors
);
684 static int alloc_disk_sb(struct md_rdev
*rdev
)
686 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
687 if (!rdev
->sb_page
) {
688 printk(KERN_ALERT
"md: out of memory.\n");
695 void md_rdev_clear(struct md_rdev
*rdev
)
698 put_page(rdev
->sb_page
);
700 rdev
->sb_page
= NULL
;
705 put_page(rdev
->bb_page
);
706 rdev
->bb_page
= NULL
;
708 badblocks_exit(&rdev
->badblocks
);
710 EXPORT_SYMBOL_GPL(md_rdev_clear
);
712 static void super_written(struct bio
*bio
)
714 struct md_rdev
*rdev
= bio
->bi_private
;
715 struct mddev
*mddev
= rdev
->mddev
;
718 printk("md: super_written gets error=%d\n", bio
->bi_error
);
719 md_error(mddev
, rdev
);
722 if (atomic_dec_and_test(&mddev
->pending_writes
))
723 wake_up(&mddev
->sb_wait
);
724 rdev_dec_pending(rdev
, mddev
);
728 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
729 sector_t sector
, int size
, struct page
*page
)
731 /* write first size bytes of page to sector of rdev
732 * Increment mddev->pending_writes before returning
733 * and decrement it on completion, waking up sb_wait
734 * if zero is reached.
735 * If an error occurred, call md_error
737 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
739 atomic_inc(&rdev
->nr_pending
);
741 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
742 bio
->bi_iter
.bi_sector
= sector
;
743 bio_add_page(bio
, page
, size
, 0);
744 bio
->bi_private
= rdev
;
745 bio
->bi_end_io
= super_written
;
746 bio
->bi_rw
= WRITE_FLUSH_FUA
;
748 atomic_inc(&mddev
->pending_writes
);
752 void md_super_wait(struct mddev
*mddev
)
754 /* wait for all superblock writes that were scheduled to complete */
755 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
758 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
759 struct page
*page
, int rw
, bool metadata_op
)
761 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
764 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
765 rdev
->meta_bdev
: rdev
->bdev
;
768 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
769 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
770 (rdev
->mddev
->reshape_backwards
==
771 (sector
>= rdev
->mddev
->reshape_position
)))
772 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
774 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
775 bio_add_page(bio
, page
, size
, 0);
777 submit_bio_wait(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 (IS_ENABLED(CONFIG_LBDAF
) && (u64
)rdev
->sectors
>= (2ULL << 32) &&
1031 rdev
->sectors
= (sector_t
)(2ULL << 32) - 2;
1033 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1034 /* "this cannot possibly happen" ... */
1042 * validate_super for 0.90.0
1044 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1047 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1048 __u64 ev1
= md_event(sb
);
1050 rdev
->raid_disk
= -1;
1051 clear_bit(Faulty
, &rdev
->flags
);
1052 clear_bit(In_sync
, &rdev
->flags
);
1053 clear_bit(Bitmap_sync
, &rdev
->flags
);
1054 clear_bit(WriteMostly
, &rdev
->flags
);
1056 if (mddev
->raid_disks
== 0) {
1057 mddev
->major_version
= 0;
1058 mddev
->minor_version
= sb
->minor_version
;
1059 mddev
->patch_version
= sb
->patch_version
;
1060 mddev
->external
= 0;
1061 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1062 mddev
->ctime
= sb
->ctime
;
1063 mddev
->utime
= sb
->utime
;
1064 mddev
->level
= sb
->level
;
1065 mddev
->clevel
[0] = 0;
1066 mddev
->layout
= sb
->layout
;
1067 mddev
->raid_disks
= sb
->raid_disks
;
1068 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1069 mddev
->events
= ev1
;
1070 mddev
->bitmap_info
.offset
= 0;
1071 mddev
->bitmap_info
.space
= 0;
1072 /* bitmap can use 60 K after the 4K superblocks */
1073 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1074 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1075 mddev
->reshape_backwards
= 0;
1077 if (mddev
->minor_version
>= 91) {
1078 mddev
->reshape_position
= sb
->reshape_position
;
1079 mddev
->delta_disks
= sb
->delta_disks
;
1080 mddev
->new_level
= sb
->new_level
;
1081 mddev
->new_layout
= sb
->new_layout
;
1082 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1083 if (mddev
->delta_disks
< 0)
1084 mddev
->reshape_backwards
= 1;
1086 mddev
->reshape_position
= MaxSector
;
1087 mddev
->delta_disks
= 0;
1088 mddev
->new_level
= mddev
->level
;
1089 mddev
->new_layout
= mddev
->layout
;
1090 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1093 if (sb
->state
& (1<<MD_SB_CLEAN
))
1094 mddev
->recovery_cp
= MaxSector
;
1096 if (sb
->events_hi
== sb
->cp_events_hi
&&
1097 sb
->events_lo
== sb
->cp_events_lo
) {
1098 mddev
->recovery_cp
= sb
->recovery_cp
;
1100 mddev
->recovery_cp
= 0;
1103 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1104 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1105 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1106 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1108 mddev
->max_disks
= MD_SB_DISKS
;
1110 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1111 mddev
->bitmap_info
.file
== NULL
) {
1112 mddev
->bitmap_info
.offset
=
1113 mddev
->bitmap_info
.default_offset
;
1114 mddev
->bitmap_info
.space
=
1115 mddev
->bitmap_info
.default_space
;
1118 } else if (mddev
->pers
== NULL
) {
1119 /* Insist on good event counter while assembling, except
1120 * for spares (which don't need an event count) */
1122 if (sb
->disks
[rdev
->desc_nr
].state
& (
1123 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1124 if (ev1
< mddev
->events
)
1126 } else if (mddev
->bitmap
) {
1127 /* if adding to array with a bitmap, then we can accept an
1128 * older device ... but not too old.
1130 if (ev1
< mddev
->bitmap
->events_cleared
)
1132 if (ev1
< mddev
->events
)
1133 set_bit(Bitmap_sync
, &rdev
->flags
);
1135 if (ev1
< mddev
->events
)
1136 /* just a hot-add of a new device, leave raid_disk at -1 */
1140 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1141 desc
= sb
->disks
+ rdev
->desc_nr
;
1143 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1144 set_bit(Faulty
, &rdev
->flags
);
1145 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1146 desc->raid_disk < mddev->raid_disks */) {
1147 set_bit(In_sync
, &rdev
->flags
);
1148 rdev
->raid_disk
= desc
->raid_disk
;
1149 rdev
->saved_raid_disk
= desc
->raid_disk
;
1150 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1151 /* active but not in sync implies recovery up to
1152 * reshape position. We don't know exactly where
1153 * that is, so set to zero for now */
1154 if (mddev
->minor_version
>= 91) {
1155 rdev
->recovery_offset
= 0;
1156 rdev
->raid_disk
= desc
->raid_disk
;
1159 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1160 set_bit(WriteMostly
, &rdev
->flags
);
1161 } else /* MULTIPATH are always insync */
1162 set_bit(In_sync
, &rdev
->flags
);
1167 * sync_super for 0.90.0
1169 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1172 struct md_rdev
*rdev2
;
1173 int next_spare
= mddev
->raid_disks
;
1175 /* make rdev->sb match mddev data..
1178 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1179 * 3/ any empty disks < next_spare become removed
1181 * disks[0] gets initialised to REMOVED because
1182 * we cannot be sure from other fields if it has
1183 * been initialised or not.
1186 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1188 rdev
->sb_size
= MD_SB_BYTES
;
1190 sb
= page_address(rdev
->sb_page
);
1192 memset(sb
, 0, sizeof(*sb
));
1194 sb
->md_magic
= MD_SB_MAGIC
;
1195 sb
->major_version
= mddev
->major_version
;
1196 sb
->patch_version
= mddev
->patch_version
;
1197 sb
->gvalid_words
= 0; /* ignored */
1198 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1199 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1200 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1201 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1203 sb
->ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
1204 sb
->level
= mddev
->level
;
1205 sb
->size
= mddev
->dev_sectors
/ 2;
1206 sb
->raid_disks
= mddev
->raid_disks
;
1207 sb
->md_minor
= mddev
->md_minor
;
1208 sb
->not_persistent
= 0;
1209 sb
->utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
1211 sb
->events_hi
= (mddev
->events
>>32);
1212 sb
->events_lo
= (u32
)mddev
->events
;
1214 if (mddev
->reshape_position
== MaxSector
)
1215 sb
->minor_version
= 90;
1217 sb
->minor_version
= 91;
1218 sb
->reshape_position
= mddev
->reshape_position
;
1219 sb
->new_level
= mddev
->new_level
;
1220 sb
->delta_disks
= mddev
->delta_disks
;
1221 sb
->new_layout
= mddev
->new_layout
;
1222 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1224 mddev
->minor_version
= sb
->minor_version
;
1227 sb
->recovery_cp
= mddev
->recovery_cp
;
1228 sb
->cp_events_hi
= (mddev
->events
>>32);
1229 sb
->cp_events_lo
= (u32
)mddev
->events
;
1230 if (mddev
->recovery_cp
== MaxSector
)
1231 sb
->state
= (1<< MD_SB_CLEAN
);
1233 sb
->recovery_cp
= 0;
1235 sb
->layout
= mddev
->layout
;
1236 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1238 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1239 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1241 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1242 rdev_for_each(rdev2
, mddev
) {
1245 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1247 if (rdev2
->raid_disk
>= 0 &&
1248 sb
->minor_version
>= 91)
1249 /* we have nowhere to store the recovery_offset,
1250 * but if it is not below the reshape_position,
1251 * we can piggy-back on that.
1254 if (rdev2
->raid_disk
< 0 ||
1255 test_bit(Faulty
, &rdev2
->flags
))
1258 desc_nr
= rdev2
->raid_disk
;
1260 desc_nr
= next_spare
++;
1261 rdev2
->desc_nr
= desc_nr
;
1262 d
= &sb
->disks
[rdev2
->desc_nr
];
1264 d
->number
= rdev2
->desc_nr
;
1265 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1266 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1268 d
->raid_disk
= rdev2
->raid_disk
;
1270 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1271 if (test_bit(Faulty
, &rdev2
->flags
))
1272 d
->state
= (1<<MD_DISK_FAULTY
);
1273 else if (is_active
) {
1274 d
->state
= (1<<MD_DISK_ACTIVE
);
1275 if (test_bit(In_sync
, &rdev2
->flags
))
1276 d
->state
|= (1<<MD_DISK_SYNC
);
1284 if (test_bit(WriteMostly
, &rdev2
->flags
))
1285 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1287 /* now set the "removed" and "faulty" bits on any missing devices */
1288 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1289 mdp_disk_t
*d
= &sb
->disks
[i
];
1290 if (d
->state
== 0 && d
->number
== 0) {
1293 d
->state
= (1<<MD_DISK_REMOVED
);
1294 d
->state
|= (1<<MD_DISK_FAULTY
);
1298 sb
->nr_disks
= nr_disks
;
1299 sb
->active_disks
= active
;
1300 sb
->working_disks
= working
;
1301 sb
->failed_disks
= failed
;
1302 sb
->spare_disks
= spare
;
1304 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1305 sb
->sb_csum
= calc_sb_csum(sb
);
1309 * rdev_size_change for 0.90.0
1311 static unsigned long long
1312 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1314 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1315 return 0; /* component must fit device */
1316 if (rdev
->mddev
->bitmap_info
.offset
)
1317 return 0; /* can't move bitmap */
1318 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1319 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1320 num_sectors
= rdev
->sb_start
;
1321 /* Limit to 4TB as metadata cannot record more than that.
1322 * 4TB == 2^32 KB, or 2*2^32 sectors.
1324 if (IS_ENABLED(CONFIG_LBDAF
) && (u64
)num_sectors
>= (2ULL << 32) &&
1325 rdev
->mddev
->level
>= 1)
1326 num_sectors
= (sector_t
)(2ULL << 32) - 2;
1327 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1329 md_super_wait(rdev
->mddev
);
1334 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1336 /* non-zero offset changes not possible with v0.90 */
1337 return new_offset
== 0;
1341 * version 1 superblock
1344 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1348 unsigned long long newcsum
;
1349 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1350 __le32
*isuper
= (__le32
*)sb
;
1352 disk_csum
= sb
->sb_csum
;
1355 for (; size
>= 4; size
-= 4)
1356 newcsum
+= le32_to_cpu(*isuper
++);
1359 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1361 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1362 sb
->sb_csum
= disk_csum
;
1363 return cpu_to_le32(csum
);
1366 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1368 struct mdp_superblock_1
*sb
;
1372 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1376 * Calculate the position of the superblock in 512byte sectors.
1377 * It is always aligned to a 4K boundary and
1378 * depeding on minor_version, it can be:
1379 * 0: At least 8K, but less than 12K, from end of device
1380 * 1: At start of device
1381 * 2: 4K from start of device.
1383 switch(minor_version
) {
1385 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1387 sb_start
&= ~(sector_t
)(4*2-1);
1398 rdev
->sb_start
= sb_start
;
1400 /* superblock is rarely larger than 1K, but it can be larger,
1401 * and it is safe to read 4k, so we do that
1403 ret
= read_disk_sb(rdev
, 4096);
1404 if (ret
) return ret
;
1406 sb
= page_address(rdev
->sb_page
);
1408 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1409 sb
->major_version
!= cpu_to_le32(1) ||
1410 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1411 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1412 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1415 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1416 printk("md: invalid superblock checksum on %s\n",
1417 bdevname(rdev
->bdev
,b
));
1420 if (le64_to_cpu(sb
->data_size
) < 10) {
1421 printk("md: data_size too small on %s\n",
1422 bdevname(rdev
->bdev
,b
));
1427 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1428 /* Some padding is non-zero, might be a new feature */
1431 rdev
->preferred_minor
= 0xffff;
1432 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1433 rdev
->new_data_offset
= rdev
->data_offset
;
1434 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1435 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1436 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1437 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1439 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1440 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1441 if (rdev
->sb_size
& bmask
)
1442 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1445 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1448 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1451 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1454 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1456 if (!rdev
->bb_page
) {
1457 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1461 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1462 rdev
->badblocks
.count
== 0) {
1463 /* need to load the bad block list.
1464 * Currently we limit it to one page.
1470 int sectors
= le16_to_cpu(sb
->bblog_size
);
1471 if (sectors
> (PAGE_SIZE
/ 512))
1473 offset
= le32_to_cpu(sb
->bblog_offset
);
1476 bb_sector
= (long long)offset
;
1477 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1478 rdev
->bb_page
, READ
, true))
1480 bbp
= (u64
*)page_address(rdev
->bb_page
);
1481 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1482 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1483 u64 bb
= le64_to_cpu(*bbp
);
1484 int count
= bb
& (0x3ff);
1485 u64 sector
= bb
>> 10;
1486 sector
<<= sb
->bblog_shift
;
1487 count
<<= sb
->bblog_shift
;
1490 if (badblocks_set(&rdev
->badblocks
, sector
, count
, 1))
1493 } else if (sb
->bblog_offset
!= 0)
1494 rdev
->badblocks
.shift
= 0;
1500 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1502 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1503 sb
->level
!= refsb
->level
||
1504 sb
->layout
!= refsb
->layout
||
1505 sb
->chunksize
!= refsb
->chunksize
) {
1506 printk(KERN_WARNING
"md: %s has strangely different"
1507 " superblock to %s\n",
1508 bdevname(rdev
->bdev
,b
),
1509 bdevname(refdev
->bdev
,b2
));
1512 ev1
= le64_to_cpu(sb
->events
);
1513 ev2
= le64_to_cpu(refsb
->events
);
1520 if (minor_version
) {
1521 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1522 sectors
-= rdev
->data_offset
;
1524 sectors
= rdev
->sb_start
;
1525 if (sectors
< le64_to_cpu(sb
->data_size
))
1527 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1531 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1533 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1534 __u64 ev1
= le64_to_cpu(sb
->events
);
1536 rdev
->raid_disk
= -1;
1537 clear_bit(Faulty
, &rdev
->flags
);
1538 clear_bit(In_sync
, &rdev
->flags
);
1539 clear_bit(Bitmap_sync
, &rdev
->flags
);
1540 clear_bit(WriteMostly
, &rdev
->flags
);
1542 if (mddev
->raid_disks
== 0) {
1543 mddev
->major_version
= 1;
1544 mddev
->patch_version
= 0;
1545 mddev
->external
= 0;
1546 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1547 mddev
->ctime
= le64_to_cpu(sb
->ctime
);
1548 mddev
->utime
= le64_to_cpu(sb
->utime
);
1549 mddev
->level
= le32_to_cpu(sb
->level
);
1550 mddev
->clevel
[0] = 0;
1551 mddev
->layout
= le32_to_cpu(sb
->layout
);
1552 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1553 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1554 mddev
->events
= ev1
;
1555 mddev
->bitmap_info
.offset
= 0;
1556 mddev
->bitmap_info
.space
= 0;
1557 /* Default location for bitmap is 1K after superblock
1558 * using 3K - total of 4K
1560 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1561 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1562 mddev
->reshape_backwards
= 0;
1564 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1565 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1567 mddev
->max_disks
= (4096-256)/2;
1569 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1570 mddev
->bitmap_info
.file
== NULL
) {
1571 mddev
->bitmap_info
.offset
=
1572 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1573 /* Metadata doesn't record how much space is available.
1574 * For 1.0, we assume we can use up to the superblock
1575 * if before, else to 4K beyond superblock.
1576 * For others, assume no change is possible.
1578 if (mddev
->minor_version
> 0)
1579 mddev
->bitmap_info
.space
= 0;
1580 else if (mddev
->bitmap_info
.offset
> 0)
1581 mddev
->bitmap_info
.space
=
1582 8 - mddev
->bitmap_info
.offset
;
1584 mddev
->bitmap_info
.space
=
1585 -mddev
->bitmap_info
.offset
;
1588 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1589 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1590 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1591 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1592 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1593 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1594 if (mddev
->delta_disks
< 0 ||
1595 (mddev
->delta_disks
== 0 &&
1596 (le32_to_cpu(sb
->feature_map
)
1597 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1598 mddev
->reshape_backwards
= 1;
1600 mddev
->reshape_position
= MaxSector
;
1601 mddev
->delta_disks
= 0;
1602 mddev
->new_level
= mddev
->level
;
1603 mddev
->new_layout
= mddev
->layout
;
1604 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1607 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
) {
1608 set_bit(MD_HAS_JOURNAL
, &mddev
->flags
);
1609 if (mddev
->recovery_cp
== MaxSector
)
1610 set_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
);
1612 } else if (mddev
->pers
== NULL
) {
1613 /* Insist of good event counter while assembling, except for
1614 * spares (which don't need an event count) */
1616 if (rdev
->desc_nr
>= 0 &&
1617 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1618 (le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < MD_DISK_ROLE_MAX
||
1619 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) == MD_DISK_ROLE_JOURNAL
))
1620 if (ev1
< mddev
->events
)
1622 } else if (mddev
->bitmap
) {
1623 /* If adding to array with a bitmap, then we can accept an
1624 * older device, but not too old.
1626 if (ev1
< mddev
->bitmap
->events_cleared
)
1628 if (ev1
< mddev
->events
)
1629 set_bit(Bitmap_sync
, &rdev
->flags
);
1631 if (ev1
< mddev
->events
)
1632 /* just a hot-add of a new device, leave raid_disk at -1 */
1635 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1637 if (rdev
->desc_nr
< 0 ||
1638 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1639 role
= MD_DISK_ROLE_SPARE
;
1642 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1644 case MD_DISK_ROLE_SPARE
: /* spare */
1646 case MD_DISK_ROLE_FAULTY
: /* faulty */
1647 set_bit(Faulty
, &rdev
->flags
);
1649 case MD_DISK_ROLE_JOURNAL
: /* journal device */
1650 if (!(le32_to_cpu(sb
->feature_map
) & MD_FEATURE_JOURNAL
)) {
1651 /* journal device without journal feature */
1653 "md: journal device provided without journal feature, ignoring the device\n");
1656 set_bit(Journal
, &rdev
->flags
);
1657 rdev
->journal_tail
= le64_to_cpu(sb
->journal_tail
);
1658 rdev
->raid_disk
= 0;
1661 rdev
->saved_raid_disk
= role
;
1662 if ((le32_to_cpu(sb
->feature_map
) &
1663 MD_FEATURE_RECOVERY_OFFSET
)) {
1664 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1665 if (!(le32_to_cpu(sb
->feature_map
) &
1666 MD_FEATURE_RECOVERY_BITMAP
))
1667 rdev
->saved_raid_disk
= -1;
1669 set_bit(In_sync
, &rdev
->flags
);
1670 rdev
->raid_disk
= role
;
1673 if (sb
->devflags
& WriteMostly1
)
1674 set_bit(WriteMostly
, &rdev
->flags
);
1675 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1676 set_bit(Replacement
, &rdev
->flags
);
1677 } else /* MULTIPATH are always insync */
1678 set_bit(In_sync
, &rdev
->flags
);
1683 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1685 struct mdp_superblock_1
*sb
;
1686 struct md_rdev
*rdev2
;
1688 /* make rdev->sb match mddev and rdev data. */
1690 sb
= page_address(rdev
->sb_page
);
1692 sb
->feature_map
= 0;
1694 sb
->recovery_offset
= cpu_to_le64(0);
1695 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1697 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1698 sb
->events
= cpu_to_le64(mddev
->events
);
1700 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1701 else if (test_bit(MD_JOURNAL_CLEAN
, &mddev
->flags
))
1702 sb
->resync_offset
= cpu_to_le64(MaxSector
);
1704 sb
->resync_offset
= cpu_to_le64(0);
1706 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1708 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1709 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1710 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1711 sb
->level
= cpu_to_le32(mddev
->level
);
1712 sb
->layout
= cpu_to_le32(mddev
->layout
);
1714 if (test_bit(WriteMostly
, &rdev
->flags
))
1715 sb
->devflags
|= WriteMostly1
;
1717 sb
->devflags
&= ~WriteMostly1
;
1718 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1719 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1721 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1722 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1723 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1726 if (rdev
->raid_disk
>= 0 && !test_bit(Journal
, &rdev
->flags
) &&
1727 !test_bit(In_sync
, &rdev
->flags
)) {
1729 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1730 sb
->recovery_offset
=
1731 cpu_to_le64(rdev
->recovery_offset
);
1732 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1734 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1736 /* Note: recovery_offset and journal_tail share space */
1737 if (test_bit(Journal
, &rdev
->flags
))
1738 sb
->journal_tail
= cpu_to_le64(rdev
->journal_tail
);
1739 if (test_bit(Replacement
, &rdev
->flags
))
1741 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1743 if (mddev
->reshape_position
!= MaxSector
) {
1744 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1745 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1746 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1747 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1748 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1749 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1750 if (mddev
->delta_disks
== 0 &&
1751 mddev
->reshape_backwards
)
1753 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1754 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1756 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1757 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1758 - rdev
->data_offset
));
1762 if (mddev_is_clustered(mddev
))
1763 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_CLUSTERED
);
1765 if (rdev
->badblocks
.count
== 0)
1766 /* Nothing to do for bad blocks*/ ;
1767 else if (sb
->bblog_offset
== 0)
1768 /* Cannot record bad blocks on this device */
1769 md_error(mddev
, rdev
);
1771 struct badblocks
*bb
= &rdev
->badblocks
;
1772 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1774 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1779 seq
= read_seqbegin(&bb
->lock
);
1781 memset(bbp
, 0xff, PAGE_SIZE
);
1783 for (i
= 0 ; i
< bb
->count
; i
++) {
1784 u64 internal_bb
= p
[i
];
1785 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1786 | BB_LEN(internal_bb
));
1787 bbp
[i
] = cpu_to_le64(store_bb
);
1790 if (read_seqretry(&bb
->lock
, seq
))
1793 bb
->sector
= (rdev
->sb_start
+
1794 (int)le32_to_cpu(sb
->bblog_offset
));
1795 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1800 rdev_for_each(rdev2
, mddev
)
1801 if (rdev2
->desc_nr
+1 > max_dev
)
1802 max_dev
= rdev2
->desc_nr
+1;
1804 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1806 sb
->max_dev
= cpu_to_le32(max_dev
);
1807 rdev
->sb_size
= max_dev
* 2 + 256;
1808 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1809 if (rdev
->sb_size
& bmask
)
1810 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1812 max_dev
= le32_to_cpu(sb
->max_dev
);
1814 for (i
=0; i
<max_dev
;i
++)
1815 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1817 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
))
1818 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_JOURNAL
);
1820 rdev_for_each(rdev2
, mddev
) {
1822 if (test_bit(Faulty
, &rdev2
->flags
))
1823 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_FAULTY
);
1824 else if (test_bit(In_sync
, &rdev2
->flags
))
1825 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1826 else if (test_bit(Journal
, &rdev2
->flags
))
1827 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_JOURNAL
);
1828 else if (rdev2
->raid_disk
>= 0)
1829 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1831 sb
->dev_roles
[i
] = cpu_to_le16(MD_DISK_ROLE_SPARE
);
1834 sb
->sb_csum
= calc_sb_1_csum(sb
);
1837 static unsigned long long
1838 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1840 struct mdp_superblock_1
*sb
;
1841 sector_t max_sectors
;
1842 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1843 return 0; /* component must fit device */
1844 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1845 return 0; /* too confusing */
1846 if (rdev
->sb_start
< rdev
->data_offset
) {
1847 /* minor versions 1 and 2; superblock before data */
1848 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1849 max_sectors
-= rdev
->data_offset
;
1850 if (!num_sectors
|| num_sectors
> max_sectors
)
1851 num_sectors
= max_sectors
;
1852 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1853 /* minor version 0 with bitmap we can't move */
1856 /* minor version 0; superblock after data */
1858 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1859 sb_start
&= ~(sector_t
)(4*2 - 1);
1860 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1861 if (!num_sectors
|| num_sectors
> max_sectors
)
1862 num_sectors
= max_sectors
;
1863 rdev
->sb_start
= sb_start
;
1865 sb
= page_address(rdev
->sb_page
);
1866 sb
->data_size
= cpu_to_le64(num_sectors
);
1867 sb
->super_offset
= rdev
->sb_start
;
1868 sb
->sb_csum
= calc_sb_1_csum(sb
);
1869 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1871 md_super_wait(rdev
->mddev
);
1877 super_1_allow_new_offset(struct md_rdev
*rdev
,
1878 unsigned long long new_offset
)
1880 /* All necessary checks on new >= old have been done */
1881 struct bitmap
*bitmap
;
1882 if (new_offset
>= rdev
->data_offset
)
1885 /* with 1.0 metadata, there is no metadata to tread on
1886 * so we can always move back */
1887 if (rdev
->mddev
->minor_version
== 0)
1890 /* otherwise we must be sure not to step on
1891 * any metadata, so stay:
1892 * 36K beyond start of superblock
1893 * beyond end of badblocks
1894 * beyond write-intent bitmap
1896 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1898 bitmap
= rdev
->mddev
->bitmap
;
1899 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1900 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1901 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1903 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1909 static struct super_type super_types
[] = {
1912 .owner
= THIS_MODULE
,
1913 .load_super
= super_90_load
,
1914 .validate_super
= super_90_validate
,
1915 .sync_super
= super_90_sync
,
1916 .rdev_size_change
= super_90_rdev_size_change
,
1917 .allow_new_offset
= super_90_allow_new_offset
,
1921 .owner
= THIS_MODULE
,
1922 .load_super
= super_1_load
,
1923 .validate_super
= super_1_validate
,
1924 .sync_super
= super_1_sync
,
1925 .rdev_size_change
= super_1_rdev_size_change
,
1926 .allow_new_offset
= super_1_allow_new_offset
,
1930 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1932 if (mddev
->sync_super
) {
1933 mddev
->sync_super(mddev
, rdev
);
1937 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1939 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1942 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1944 struct md_rdev
*rdev
, *rdev2
;
1947 rdev_for_each_rcu(rdev
, mddev1
) {
1948 if (test_bit(Faulty
, &rdev
->flags
) ||
1949 test_bit(Journal
, &rdev
->flags
) ||
1950 rdev
->raid_disk
== -1)
1952 rdev_for_each_rcu(rdev2
, mddev2
) {
1953 if (test_bit(Faulty
, &rdev2
->flags
) ||
1954 test_bit(Journal
, &rdev2
->flags
) ||
1955 rdev2
->raid_disk
== -1)
1957 if (rdev
->bdev
->bd_contains
==
1958 rdev2
->bdev
->bd_contains
) {
1968 static LIST_HEAD(pending_raid_disks
);
1971 * Try to register data integrity profile for an mddev
1973 * This is called when an array is started and after a disk has been kicked
1974 * from the array. It only succeeds if all working and active component devices
1975 * are integrity capable with matching profiles.
1977 int md_integrity_register(struct mddev
*mddev
)
1979 struct md_rdev
*rdev
, *reference
= NULL
;
1981 if (list_empty(&mddev
->disks
))
1982 return 0; /* nothing to do */
1983 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1984 return 0; /* shouldn't register, or already is */
1985 rdev_for_each(rdev
, mddev
) {
1986 /* skip spares and non-functional disks */
1987 if (test_bit(Faulty
, &rdev
->flags
))
1989 if (rdev
->raid_disk
< 0)
1992 /* Use the first rdev as the reference */
1996 /* does this rdev's profile match the reference profile? */
1997 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1998 rdev
->bdev
->bd_disk
) < 0)
2001 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
2004 * All component devices are integrity capable and have matching
2005 * profiles, register the common profile for the md device.
2007 blk_integrity_register(mddev
->gendisk
,
2008 bdev_get_integrity(reference
->bdev
));
2010 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2011 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2012 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2018 EXPORT_SYMBOL(md_integrity_register
);
2021 * Attempt to add an rdev, but only if it is consistent with the current
2024 int md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2026 struct blk_integrity
*bi_rdev
;
2027 struct blk_integrity
*bi_mddev
;
2028 char name
[BDEVNAME_SIZE
];
2030 if (!mddev
->gendisk
)
2033 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2034 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2036 if (!bi_mddev
) /* nothing to do */
2039 if (blk_integrity_compare(mddev
->gendisk
, rdev
->bdev
->bd_disk
) != 0) {
2040 printk(KERN_NOTICE
"%s: incompatible integrity profile for %s\n",
2041 mdname(mddev
), bdevname(rdev
->bdev
, name
));
2047 EXPORT_SYMBOL(md_integrity_add_rdev
);
2049 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2051 char b
[BDEVNAME_SIZE
];
2055 /* prevent duplicates */
2056 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2059 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2060 if (!test_bit(Journal
, &rdev
->flags
) &&
2062 (mddev
->dev_sectors
== 0 || rdev
->sectors
< mddev
->dev_sectors
)) {
2064 /* Cannot change size, so fail
2065 * If mddev->level <= 0, then we don't care
2066 * about aligning sizes (e.g. linear)
2068 if (mddev
->level
> 0)
2071 mddev
->dev_sectors
= rdev
->sectors
;
2074 /* Verify rdev->desc_nr is unique.
2075 * If it is -1, assign a free number, else
2076 * check number is not in use
2079 if (rdev
->desc_nr
< 0) {
2082 choice
= mddev
->raid_disks
;
2083 while (md_find_rdev_nr_rcu(mddev
, choice
))
2085 rdev
->desc_nr
= choice
;
2087 if (md_find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2093 if (!test_bit(Journal
, &rdev
->flags
) &&
2094 mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2095 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2096 mdname(mddev
), mddev
->max_disks
);
2099 bdevname(rdev
->bdev
,b
);
2100 strreplace(b
, '/', '!');
2102 rdev
->mddev
= mddev
;
2103 printk(KERN_INFO
"md: bind<%s>\n", b
);
2105 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2108 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2109 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2110 /* failure here is OK */;
2111 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2113 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2114 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2116 /* May as well allow recovery to be retried once */
2117 mddev
->recovery_disabled
++;
2122 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2127 static void md_delayed_delete(struct work_struct
*ws
)
2129 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2130 kobject_del(&rdev
->kobj
);
2131 kobject_put(&rdev
->kobj
);
2134 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2136 char b
[BDEVNAME_SIZE
];
2138 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2139 list_del_rcu(&rdev
->same_set
);
2140 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2142 sysfs_remove_link(&rdev
->kobj
, "block");
2143 sysfs_put(rdev
->sysfs_state
);
2144 rdev
->sysfs_state
= NULL
;
2145 rdev
->badblocks
.count
= 0;
2146 /* We need to delay this, otherwise we can deadlock when
2147 * writing to 'remove' to "dev/state". We also need
2148 * to delay it due to rcu usage.
2151 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2152 kobject_get(&rdev
->kobj
);
2153 queue_work(md_misc_wq
, &rdev
->del_work
);
2157 * prevent the device from being mounted, repartitioned or
2158 * otherwise reused by a RAID array (or any other kernel
2159 * subsystem), by bd_claiming the device.
2161 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2164 struct block_device
*bdev
;
2165 char b
[BDEVNAME_SIZE
];
2167 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2168 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2170 printk(KERN_ERR
"md: could not open %s.\n",
2171 __bdevname(dev
, b
));
2172 return PTR_ERR(bdev
);
2178 static void unlock_rdev(struct md_rdev
*rdev
)
2180 struct block_device
*bdev
= rdev
->bdev
;
2182 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2185 void md_autodetect_dev(dev_t dev
);
2187 static void export_rdev(struct md_rdev
*rdev
)
2189 char b
[BDEVNAME_SIZE
];
2191 printk(KERN_INFO
"md: export_rdev(%s)\n",
2192 bdevname(rdev
->bdev
,b
));
2193 md_rdev_clear(rdev
);
2195 if (test_bit(AutoDetected
, &rdev
->flags
))
2196 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2199 kobject_put(&rdev
->kobj
);
2202 void md_kick_rdev_from_array(struct md_rdev
*rdev
)
2204 unbind_rdev_from_array(rdev
);
2207 EXPORT_SYMBOL_GPL(md_kick_rdev_from_array
);
2209 static void export_array(struct mddev
*mddev
)
2211 struct md_rdev
*rdev
;
2213 while (!list_empty(&mddev
->disks
)) {
2214 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2216 md_kick_rdev_from_array(rdev
);
2218 mddev
->raid_disks
= 0;
2219 mddev
->major_version
= 0;
2222 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2224 /* Update each superblock (in-memory image), but
2225 * if we are allowed to, skip spares which already
2226 * have the right event counter, or have one earlier
2227 * (which would mean they aren't being marked as dirty
2228 * with the rest of the array)
2230 struct md_rdev
*rdev
;
2231 rdev_for_each(rdev
, mddev
) {
2232 if (rdev
->sb_events
== mddev
->events
||
2234 rdev
->raid_disk
< 0 &&
2235 rdev
->sb_events
+1 == mddev
->events
)) {
2236 /* Don't update this superblock */
2237 rdev
->sb_loaded
= 2;
2239 sync_super(mddev
, rdev
);
2240 rdev
->sb_loaded
= 1;
2245 static bool does_sb_need_changing(struct mddev
*mddev
)
2247 struct md_rdev
*rdev
;
2248 struct mdp_superblock_1
*sb
;
2251 /* Find a good rdev */
2252 rdev_for_each(rdev
, mddev
)
2253 if ((rdev
->raid_disk
>= 0) && !test_bit(Faulty
, &rdev
->flags
))
2256 /* No good device found. */
2260 sb
= page_address(rdev
->sb_page
);
2261 /* Check if a device has become faulty or a spare become active */
2262 rdev_for_each(rdev
, mddev
) {
2263 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
2264 /* Device activated? */
2265 if (role
== 0xffff && rdev
->raid_disk
>=0 &&
2266 !test_bit(Faulty
, &rdev
->flags
))
2268 /* Device turned faulty? */
2269 if (test_bit(Faulty
, &rdev
->flags
) && (role
< 0xfffd))
2273 /* Check if any mddev parameters have changed */
2274 if ((mddev
->dev_sectors
!= le64_to_cpu(sb
->size
)) ||
2275 (mddev
->reshape_position
!= le64_to_cpu(sb
->reshape_position
)) ||
2276 (mddev
->layout
!= le64_to_cpu(sb
->layout
)) ||
2277 (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
)) ||
2278 (mddev
->chunk_sectors
!= le32_to_cpu(sb
->chunksize
)))
2284 void md_update_sb(struct mddev
*mddev
, int force_change
)
2286 struct md_rdev
*rdev
;
2289 int any_badblocks_changed
= 0;
2294 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2299 if (mddev_is_clustered(mddev
)) {
2300 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2302 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2304 ret
= md_cluster_ops
->metadata_update_start(mddev
);
2305 /* Has someone else has updated the sb */
2306 if (!does_sb_need_changing(mddev
)) {
2308 md_cluster_ops
->metadata_update_cancel(mddev
);
2309 bit_clear_unless(&mddev
->flags
, BIT(MD_CHANGE_PENDING
),
2310 BIT(MD_CHANGE_DEVS
) |
2311 BIT(MD_CHANGE_CLEAN
));
2316 /* First make sure individual recovery_offsets are correct */
2317 rdev_for_each(rdev
, mddev
) {
2318 if (rdev
->raid_disk
>= 0 &&
2319 mddev
->delta_disks
>= 0 &&
2320 !test_bit(Journal
, &rdev
->flags
) &&
2321 !test_bit(In_sync
, &rdev
->flags
) &&
2322 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2323 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2326 if (!mddev
->persistent
) {
2327 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2328 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2329 if (!mddev
->external
) {
2330 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2331 rdev_for_each(rdev
, mddev
) {
2332 if (rdev
->badblocks
.changed
) {
2333 rdev
->badblocks
.changed
= 0;
2334 ack_all_badblocks(&rdev
->badblocks
);
2335 md_error(mddev
, rdev
);
2337 clear_bit(Blocked
, &rdev
->flags
);
2338 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2339 wake_up(&rdev
->blocked_wait
);
2342 wake_up(&mddev
->sb_wait
);
2346 spin_lock(&mddev
->lock
);
2348 mddev
->utime
= ktime_get_real_seconds();
2350 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2352 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2353 /* just a clean<-> dirty transition, possibly leave spares alone,
2354 * though if events isn't the right even/odd, we will have to do
2360 if (mddev
->degraded
)
2361 /* If the array is degraded, then skipping spares is both
2362 * dangerous and fairly pointless.
2363 * Dangerous because a device that was removed from the array
2364 * might have a event_count that still looks up-to-date,
2365 * so it can be re-added without a resync.
2366 * Pointless because if there are any spares to skip,
2367 * then a recovery will happen and soon that array won't
2368 * be degraded any more and the spare can go back to sleep then.
2372 sync_req
= mddev
->in_sync
;
2374 /* If this is just a dirty<->clean transition, and the array is clean
2375 * and 'events' is odd, we can roll back to the previous clean state */
2377 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2378 && mddev
->can_decrease_events
2379 && mddev
->events
!= 1) {
2381 mddev
->can_decrease_events
= 0;
2383 /* otherwise we have to go forward and ... */
2385 mddev
->can_decrease_events
= nospares
;
2389 * This 64-bit counter should never wrap.
2390 * Either we are in around ~1 trillion A.C., assuming
2391 * 1 reboot per second, or we have a bug...
2393 WARN_ON(mddev
->events
== 0);
2395 rdev_for_each(rdev
, mddev
) {
2396 if (rdev
->badblocks
.changed
)
2397 any_badblocks_changed
++;
2398 if (test_bit(Faulty
, &rdev
->flags
))
2399 set_bit(FaultRecorded
, &rdev
->flags
);
2402 sync_sbs(mddev
, nospares
);
2403 spin_unlock(&mddev
->lock
);
2405 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2406 mdname(mddev
), mddev
->in_sync
);
2408 bitmap_update_sb(mddev
->bitmap
);
2409 rdev_for_each(rdev
, mddev
) {
2410 char b
[BDEVNAME_SIZE
];
2412 if (rdev
->sb_loaded
!= 1)
2413 continue; /* no noise on spare devices */
2415 if (!test_bit(Faulty
, &rdev
->flags
)) {
2416 md_super_write(mddev
,rdev
,
2417 rdev
->sb_start
, rdev
->sb_size
,
2419 pr_debug("md: (write) %s's sb offset: %llu\n",
2420 bdevname(rdev
->bdev
, b
),
2421 (unsigned long long)rdev
->sb_start
);
2422 rdev
->sb_events
= mddev
->events
;
2423 if (rdev
->badblocks
.size
) {
2424 md_super_write(mddev
, rdev
,
2425 rdev
->badblocks
.sector
,
2426 rdev
->badblocks
.size
<< 9,
2428 rdev
->badblocks
.size
= 0;
2432 pr_debug("md: %s (skipping faulty)\n",
2433 bdevname(rdev
->bdev
, b
));
2435 if (mddev
->level
== LEVEL_MULTIPATH
)
2436 /* only need to write one superblock... */
2439 md_super_wait(mddev
);
2440 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2442 if (mddev_is_clustered(mddev
) && ret
== 0)
2443 md_cluster_ops
->metadata_update_finish(mddev
);
2445 if (mddev
->in_sync
!= sync_req
||
2446 !bit_clear_unless(&mddev
->flags
, BIT(MD_CHANGE_PENDING
),
2447 BIT(MD_CHANGE_DEVS
) | BIT(MD_CHANGE_CLEAN
)))
2448 /* have to write it out again */
2450 wake_up(&mddev
->sb_wait
);
2451 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2452 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2454 rdev_for_each(rdev
, mddev
) {
2455 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2456 clear_bit(Blocked
, &rdev
->flags
);
2458 if (any_badblocks_changed
)
2459 ack_all_badblocks(&rdev
->badblocks
);
2460 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2461 wake_up(&rdev
->blocked_wait
);
2464 EXPORT_SYMBOL(md_update_sb
);
2466 static int add_bound_rdev(struct md_rdev
*rdev
)
2468 struct mddev
*mddev
= rdev
->mddev
;
2470 bool add_journal
= test_bit(Journal
, &rdev
->flags
);
2472 if (!mddev
->pers
->hot_remove_disk
|| add_journal
) {
2473 /* If there is hot_add_disk but no hot_remove_disk
2474 * then added disks for geometry changes,
2475 * and should be added immediately.
2477 super_types
[mddev
->major_version
].
2478 validate_super(mddev
, rdev
);
2480 mddev_suspend(mddev
);
2481 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
2483 mddev_resume(mddev
);
2485 unbind_rdev_from_array(rdev
);
2490 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2492 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2493 if (mddev
->degraded
)
2494 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2495 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2496 md_new_event(mddev
);
2497 md_wakeup_thread(mddev
->thread
);
2501 /* words written to sysfs files may, or may not, be \n terminated.
2502 * We want to accept with case. For this we use cmd_match.
2504 static int cmd_match(const char *cmd
, const char *str
)
2506 /* See if cmd, written into a sysfs file, matches
2507 * str. They must either be the same, or cmd can
2508 * have a trailing newline
2510 while (*cmd
&& *str
&& *cmd
== *str
) {
2521 struct rdev_sysfs_entry
{
2522 struct attribute attr
;
2523 ssize_t (*show
)(struct md_rdev
*, char *);
2524 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2528 state_show(struct md_rdev
*rdev
, char *page
)
2532 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2534 if (test_bit(Faulty
, &flags
) ||
2535 rdev
->badblocks
.unacked_exist
) {
2536 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2539 if (test_bit(In_sync
, &flags
)) {
2540 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2543 if (test_bit(Journal
, &flags
)) {
2544 len
+= sprintf(page
+len
, "%sjournal",sep
);
2547 if (test_bit(WriteMostly
, &flags
)) {
2548 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2551 if (test_bit(Blocked
, &flags
) ||
2552 (rdev
->badblocks
.unacked_exist
2553 && !test_bit(Faulty
, &flags
))) {
2554 len
+= sprintf(page
+len
, "%sblocked", sep
);
2557 if (!test_bit(Faulty
, &flags
) &&
2558 !test_bit(Journal
, &flags
) &&
2559 !test_bit(In_sync
, &flags
)) {
2560 len
+= sprintf(page
+len
, "%sspare", sep
);
2563 if (test_bit(WriteErrorSeen
, &flags
)) {
2564 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2567 if (test_bit(WantReplacement
, &flags
)) {
2568 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2571 if (test_bit(Replacement
, &flags
)) {
2572 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2576 return len
+sprintf(page
+len
, "\n");
2580 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2583 * faulty - simulates an error
2584 * remove - disconnects the device
2585 * writemostly - sets write_mostly
2586 * -writemostly - clears write_mostly
2587 * blocked - sets the Blocked flags
2588 * -blocked - clears the Blocked and possibly simulates an error
2589 * insync - sets Insync providing device isn't active
2590 * -insync - clear Insync for a device with a slot assigned,
2591 * so that it gets rebuilt based on bitmap
2592 * write_error - sets WriteErrorSeen
2593 * -write_error - clears WriteErrorSeen
2596 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2597 md_error(rdev
->mddev
, rdev
);
2598 if (test_bit(Faulty
, &rdev
->flags
))
2602 } else if (cmd_match(buf
, "remove")) {
2603 if (rdev
->raid_disk
>= 0)
2606 struct mddev
*mddev
= rdev
->mddev
;
2608 if (mddev_is_clustered(mddev
))
2609 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2612 md_kick_rdev_from_array(rdev
);
2614 md_update_sb(mddev
, 1);
2615 md_new_event(mddev
);
2618 } else if (cmd_match(buf
, "writemostly")) {
2619 set_bit(WriteMostly
, &rdev
->flags
);
2621 } else if (cmd_match(buf
, "-writemostly")) {
2622 clear_bit(WriteMostly
, &rdev
->flags
);
2624 } else if (cmd_match(buf
, "blocked")) {
2625 set_bit(Blocked
, &rdev
->flags
);
2627 } else if (cmd_match(buf
, "-blocked")) {
2628 if (!test_bit(Faulty
, &rdev
->flags
) &&
2629 rdev
->badblocks
.unacked_exist
) {
2630 /* metadata handler doesn't understand badblocks,
2631 * so we need to fail the device
2633 md_error(rdev
->mddev
, rdev
);
2635 clear_bit(Blocked
, &rdev
->flags
);
2636 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2637 wake_up(&rdev
->blocked_wait
);
2638 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2639 md_wakeup_thread(rdev
->mddev
->thread
);
2642 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2643 set_bit(In_sync
, &rdev
->flags
);
2645 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2646 !test_bit(Journal
, &rdev
->flags
)) {
2647 if (rdev
->mddev
->pers
== NULL
) {
2648 clear_bit(In_sync
, &rdev
->flags
);
2649 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2650 rdev
->raid_disk
= -1;
2653 } else if (cmd_match(buf
, "write_error")) {
2654 set_bit(WriteErrorSeen
, &rdev
->flags
);
2656 } else if (cmd_match(buf
, "-write_error")) {
2657 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2659 } else if (cmd_match(buf
, "want_replacement")) {
2660 /* Any non-spare device that is not a replacement can
2661 * become want_replacement at any time, but we then need to
2662 * check if recovery is needed.
2664 if (rdev
->raid_disk
>= 0 &&
2665 !test_bit(Journal
, &rdev
->flags
) &&
2666 !test_bit(Replacement
, &rdev
->flags
))
2667 set_bit(WantReplacement
, &rdev
->flags
);
2668 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2669 md_wakeup_thread(rdev
->mddev
->thread
);
2671 } else if (cmd_match(buf
, "-want_replacement")) {
2672 /* Clearing 'want_replacement' is always allowed.
2673 * Once replacements starts it is too late though.
2676 clear_bit(WantReplacement
, &rdev
->flags
);
2677 } else if (cmd_match(buf
, "replacement")) {
2678 /* Can only set a device as a replacement when array has not
2679 * yet been started. Once running, replacement is automatic
2680 * from spares, or by assigning 'slot'.
2682 if (rdev
->mddev
->pers
)
2685 set_bit(Replacement
, &rdev
->flags
);
2688 } else if (cmd_match(buf
, "-replacement")) {
2689 /* Similarly, can only clear Replacement before start */
2690 if (rdev
->mddev
->pers
)
2693 clear_bit(Replacement
, &rdev
->flags
);
2696 } else if (cmd_match(buf
, "re-add")) {
2697 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2698 /* clear_bit is performed _after_ all the devices
2699 * have their local Faulty bit cleared. If any writes
2700 * happen in the meantime in the local node, they
2701 * will land in the local bitmap, which will be synced
2702 * by this node eventually
2704 if (!mddev_is_clustered(rdev
->mddev
) ||
2705 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2706 clear_bit(Faulty
, &rdev
->flags
);
2707 err
= add_bound_rdev(rdev
);
2713 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2714 return err
? err
: len
;
2716 static struct rdev_sysfs_entry rdev_state
=
2717 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2720 errors_show(struct md_rdev
*rdev
, char *page
)
2722 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2726 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2731 rv
= kstrtouint(buf
, 10, &n
);
2734 atomic_set(&rdev
->corrected_errors
, n
);
2737 static struct rdev_sysfs_entry rdev_errors
=
2738 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2741 slot_show(struct md_rdev
*rdev
, char *page
)
2743 if (test_bit(Journal
, &rdev
->flags
))
2744 return sprintf(page
, "journal\n");
2745 else if (rdev
->raid_disk
< 0)
2746 return sprintf(page
, "none\n");
2748 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2752 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2757 if (test_bit(Journal
, &rdev
->flags
))
2759 if (strncmp(buf
, "none", 4)==0)
2762 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2766 if (rdev
->mddev
->pers
&& slot
== -1) {
2767 /* Setting 'slot' on an active array requires also
2768 * updating the 'rd%d' link, and communicating
2769 * with the personality with ->hot_*_disk.
2770 * For now we only support removing
2771 * failed/spare devices. This normally happens automatically,
2772 * but not when the metadata is externally managed.
2774 if (rdev
->raid_disk
== -1)
2776 /* personality does all needed checks */
2777 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2779 clear_bit(Blocked
, &rdev
->flags
);
2780 remove_and_add_spares(rdev
->mddev
, rdev
);
2781 if (rdev
->raid_disk
>= 0)
2783 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2784 md_wakeup_thread(rdev
->mddev
->thread
);
2785 } else if (rdev
->mddev
->pers
) {
2786 /* Activating a spare .. or possibly reactivating
2787 * if we ever get bitmaps working here.
2791 if (rdev
->raid_disk
!= -1)
2794 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2797 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2800 if (slot
>= rdev
->mddev
->raid_disks
&&
2801 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2804 rdev
->raid_disk
= slot
;
2805 if (test_bit(In_sync
, &rdev
->flags
))
2806 rdev
->saved_raid_disk
= slot
;
2808 rdev
->saved_raid_disk
= -1;
2809 clear_bit(In_sync
, &rdev
->flags
);
2810 clear_bit(Bitmap_sync
, &rdev
->flags
);
2811 err
= rdev
->mddev
->pers
->
2812 hot_add_disk(rdev
->mddev
, rdev
);
2814 rdev
->raid_disk
= -1;
2817 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2818 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2819 /* failure here is OK */;
2820 /* don't wakeup anyone, leave that to userspace. */
2822 if (slot
>= rdev
->mddev
->raid_disks
&&
2823 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2825 rdev
->raid_disk
= slot
;
2826 /* assume it is working */
2827 clear_bit(Faulty
, &rdev
->flags
);
2828 clear_bit(WriteMostly
, &rdev
->flags
);
2829 set_bit(In_sync
, &rdev
->flags
);
2830 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2835 static struct rdev_sysfs_entry rdev_slot
=
2836 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2839 offset_show(struct md_rdev
*rdev
, char *page
)
2841 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2845 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2847 unsigned long long offset
;
2848 if (kstrtoull(buf
, 10, &offset
) < 0)
2850 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2852 if (rdev
->sectors
&& rdev
->mddev
->external
)
2853 /* Must set offset before size, so overlap checks
2856 rdev
->data_offset
= offset
;
2857 rdev
->new_data_offset
= offset
;
2861 static struct rdev_sysfs_entry rdev_offset
=
2862 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2864 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2866 return sprintf(page
, "%llu\n",
2867 (unsigned long long)rdev
->new_data_offset
);
2870 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2871 const char *buf
, size_t len
)
2873 unsigned long long new_offset
;
2874 struct mddev
*mddev
= rdev
->mddev
;
2876 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2879 if (mddev
->sync_thread
||
2880 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2882 if (new_offset
== rdev
->data_offset
)
2883 /* reset is always permitted */
2885 else if (new_offset
> rdev
->data_offset
) {
2886 /* must not push array size beyond rdev_sectors */
2887 if (new_offset
- rdev
->data_offset
2888 + mddev
->dev_sectors
> rdev
->sectors
)
2891 /* Metadata worries about other space details. */
2893 /* decreasing the offset is inconsistent with a backwards
2896 if (new_offset
< rdev
->data_offset
&&
2897 mddev
->reshape_backwards
)
2899 /* Increasing offset is inconsistent with forwards
2900 * reshape. reshape_direction should be set to
2901 * 'backwards' first.
2903 if (new_offset
> rdev
->data_offset
&&
2904 !mddev
->reshape_backwards
)
2907 if (mddev
->pers
&& mddev
->persistent
&&
2908 !super_types
[mddev
->major_version
]
2909 .allow_new_offset(rdev
, new_offset
))
2911 rdev
->new_data_offset
= new_offset
;
2912 if (new_offset
> rdev
->data_offset
)
2913 mddev
->reshape_backwards
= 1;
2914 else if (new_offset
< rdev
->data_offset
)
2915 mddev
->reshape_backwards
= 0;
2919 static struct rdev_sysfs_entry rdev_new_offset
=
2920 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2923 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2925 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2928 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2930 /* check if two start/length pairs overlap */
2938 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2940 unsigned long long blocks
;
2943 if (kstrtoull(buf
, 10, &blocks
) < 0)
2946 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2947 return -EINVAL
; /* sector conversion overflow */
2950 if (new != blocks
* 2)
2951 return -EINVAL
; /* unsigned long long to sector_t overflow */
2958 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2960 struct mddev
*my_mddev
= rdev
->mddev
;
2961 sector_t oldsectors
= rdev
->sectors
;
2964 if (test_bit(Journal
, &rdev
->flags
))
2966 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2968 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2969 return -EINVAL
; /* too confusing */
2970 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2971 if (my_mddev
->persistent
) {
2972 sectors
= super_types
[my_mddev
->major_version
].
2973 rdev_size_change(rdev
, sectors
);
2976 } else if (!sectors
)
2977 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2979 if (!my_mddev
->pers
->resize
)
2980 /* Cannot change size for RAID0 or Linear etc */
2983 if (sectors
< my_mddev
->dev_sectors
)
2984 return -EINVAL
; /* component must fit device */
2986 rdev
->sectors
= sectors
;
2987 if (sectors
> oldsectors
&& my_mddev
->external
) {
2988 /* Need to check that all other rdevs with the same
2989 * ->bdev do not overlap. 'rcu' is sufficient to walk
2990 * the rdev lists safely.
2991 * This check does not provide a hard guarantee, it
2992 * just helps avoid dangerous mistakes.
2994 struct mddev
*mddev
;
2996 struct list_head
*tmp
;
2999 for_each_mddev(mddev
, tmp
) {
3000 struct md_rdev
*rdev2
;
3002 rdev_for_each(rdev2
, mddev
)
3003 if (rdev
->bdev
== rdev2
->bdev
&&
3005 overlaps(rdev
->data_offset
, rdev
->sectors
,
3018 /* Someone else could have slipped in a size
3019 * change here, but doing so is just silly.
3020 * We put oldsectors back because we *know* it is
3021 * safe, and trust userspace not to race with
3024 rdev
->sectors
= oldsectors
;
3031 static struct rdev_sysfs_entry rdev_size
=
3032 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3034 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3036 unsigned long long recovery_start
= rdev
->recovery_offset
;
3038 if (test_bit(In_sync
, &rdev
->flags
) ||
3039 recovery_start
== MaxSector
)
3040 return sprintf(page
, "none\n");
3042 return sprintf(page
, "%llu\n", recovery_start
);
3045 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3047 unsigned long long recovery_start
;
3049 if (cmd_match(buf
, "none"))
3050 recovery_start
= MaxSector
;
3051 else if (kstrtoull(buf
, 10, &recovery_start
))
3054 if (rdev
->mddev
->pers
&&
3055 rdev
->raid_disk
>= 0)
3058 rdev
->recovery_offset
= recovery_start
;
3059 if (recovery_start
== MaxSector
)
3060 set_bit(In_sync
, &rdev
->flags
);
3062 clear_bit(In_sync
, &rdev
->flags
);
3066 static struct rdev_sysfs_entry rdev_recovery_start
=
3067 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3069 /* sysfs access to bad-blocks list.
3070 * We present two files.
3071 * 'bad-blocks' lists sector numbers and lengths of ranges that
3072 * are recorded as bad. The list is truncated to fit within
3073 * the one-page limit of sysfs.
3074 * Writing "sector length" to this file adds an acknowledged
3076 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3077 * been acknowledged. Writing to this file adds bad blocks
3078 * without acknowledging them. This is largely for testing.
3080 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3082 return badblocks_show(&rdev
->badblocks
, page
, 0);
3084 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3086 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3087 /* Maybe that ack was all we needed */
3088 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3089 wake_up(&rdev
->blocked_wait
);
3092 static struct rdev_sysfs_entry rdev_bad_blocks
=
3093 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3095 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3097 return badblocks_show(&rdev
->badblocks
, page
, 1);
3099 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3101 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3103 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3104 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3106 static struct attribute
*rdev_default_attrs
[] = {
3111 &rdev_new_offset
.attr
,
3113 &rdev_recovery_start
.attr
,
3114 &rdev_bad_blocks
.attr
,
3115 &rdev_unack_bad_blocks
.attr
,
3119 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3121 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3122 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3128 return entry
->show(rdev
, page
);
3132 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3133 const char *page
, size_t length
)
3135 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3136 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3138 struct mddev
*mddev
= rdev
->mddev
;
3142 if (!capable(CAP_SYS_ADMIN
))
3144 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3146 if (rdev
->mddev
== NULL
)
3149 rv
= entry
->store(rdev
, page
, length
);
3150 mddev_unlock(mddev
);
3155 static void rdev_free(struct kobject
*ko
)
3157 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3160 static const struct sysfs_ops rdev_sysfs_ops
= {
3161 .show
= rdev_attr_show
,
3162 .store
= rdev_attr_store
,
3164 static struct kobj_type rdev_ktype
= {
3165 .release
= rdev_free
,
3166 .sysfs_ops
= &rdev_sysfs_ops
,
3167 .default_attrs
= rdev_default_attrs
,
3170 int md_rdev_init(struct md_rdev
*rdev
)
3173 rdev
->saved_raid_disk
= -1;
3174 rdev
->raid_disk
= -1;
3176 rdev
->data_offset
= 0;
3177 rdev
->new_data_offset
= 0;
3178 rdev
->sb_events
= 0;
3179 rdev
->last_read_error
.tv_sec
= 0;
3180 rdev
->last_read_error
.tv_nsec
= 0;
3181 rdev
->sb_loaded
= 0;
3182 rdev
->bb_page
= NULL
;
3183 atomic_set(&rdev
->nr_pending
, 0);
3184 atomic_set(&rdev
->read_errors
, 0);
3185 atomic_set(&rdev
->corrected_errors
, 0);
3187 INIT_LIST_HEAD(&rdev
->same_set
);
3188 init_waitqueue_head(&rdev
->blocked_wait
);
3190 /* Add space to store bad block list.
3191 * This reserves the space even on arrays where it cannot
3192 * be used - I wonder if that matters
3194 return badblocks_init(&rdev
->badblocks
, 0);
3196 EXPORT_SYMBOL_GPL(md_rdev_init
);
3198 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3200 * mark the device faulty if:
3202 * - the device is nonexistent (zero size)
3203 * - the device has no valid superblock
3205 * a faulty rdev _never_ has rdev->sb set.
3207 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3209 char b
[BDEVNAME_SIZE
];
3211 struct md_rdev
*rdev
;
3214 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3216 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3217 return ERR_PTR(-ENOMEM
);
3220 err
= md_rdev_init(rdev
);
3223 err
= alloc_disk_sb(rdev
);
3227 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3231 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3233 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3236 "md: %s has zero or unknown size, marking faulty!\n",
3237 bdevname(rdev
->bdev
,b
));
3242 if (super_format
>= 0) {
3243 err
= super_types
[super_format
].
3244 load_super(rdev
, NULL
, super_minor
);
3245 if (err
== -EINVAL
) {
3247 "md: %s does not have a valid v%d.%d "
3248 "superblock, not importing!\n",
3249 bdevname(rdev
->bdev
,b
),
3250 super_format
, super_minor
);
3255 "md: could not read %s's sb, not importing!\n",
3256 bdevname(rdev
->bdev
,b
));
3266 md_rdev_clear(rdev
);
3268 return ERR_PTR(err
);
3272 * Check a full RAID array for plausibility
3275 static void analyze_sbs(struct mddev
*mddev
)
3278 struct md_rdev
*rdev
, *freshest
, *tmp
;
3279 char b
[BDEVNAME_SIZE
];
3282 rdev_for_each_safe(rdev
, tmp
, mddev
)
3283 switch (super_types
[mddev
->major_version
].
3284 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3292 "md: fatal superblock inconsistency in %s"
3293 " -- removing from array\n",
3294 bdevname(rdev
->bdev
,b
));
3295 md_kick_rdev_from_array(rdev
);
3298 super_types
[mddev
->major_version
].
3299 validate_super(mddev
, freshest
);
3302 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3303 if (mddev
->max_disks
&&
3304 (rdev
->desc_nr
>= mddev
->max_disks
||
3305 i
> mddev
->max_disks
)) {
3307 "md: %s: %s: only %d devices permitted\n",
3308 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3310 md_kick_rdev_from_array(rdev
);
3313 if (rdev
!= freshest
) {
3314 if (super_types
[mddev
->major_version
].
3315 validate_super(mddev
, rdev
)) {
3316 printk(KERN_WARNING
"md: kicking non-fresh %s"
3318 bdevname(rdev
->bdev
,b
));
3319 md_kick_rdev_from_array(rdev
);
3323 if (mddev
->level
== LEVEL_MULTIPATH
) {
3324 rdev
->desc_nr
= i
++;
3325 rdev
->raid_disk
= rdev
->desc_nr
;
3326 set_bit(In_sync
, &rdev
->flags
);
3327 } else if (rdev
->raid_disk
>=
3328 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3329 !test_bit(Journal
, &rdev
->flags
)) {
3330 rdev
->raid_disk
= -1;
3331 clear_bit(In_sync
, &rdev
->flags
);
3336 /* Read a fixed-point number.
3337 * Numbers in sysfs attributes should be in "standard" units where
3338 * possible, so time should be in seconds.
3339 * However we internally use a a much smaller unit such as
3340 * milliseconds or jiffies.
3341 * This function takes a decimal number with a possible fractional
3342 * component, and produces an integer which is the result of
3343 * multiplying that number by 10^'scale'.
3344 * all without any floating-point arithmetic.
3346 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3348 unsigned long result
= 0;
3350 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3353 else if (decimals
< scale
) {
3356 result
= result
* 10 + value
;
3368 while (decimals
< scale
) {
3377 safe_delay_show(struct mddev
*mddev
, char *page
)
3379 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3380 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3383 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3387 if (mddev_is_clustered(mddev
)) {
3388 pr_info("md: Safemode is disabled for clustered mode\n");
3392 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3395 mddev
->safemode_delay
= 0;
3397 unsigned long old_delay
= mddev
->safemode_delay
;
3398 unsigned long new_delay
= (msec
*HZ
)/1000;
3402 mddev
->safemode_delay
= new_delay
;
3403 if (new_delay
< old_delay
|| old_delay
== 0)
3404 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3408 static struct md_sysfs_entry md_safe_delay
=
3409 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3412 level_show(struct mddev
*mddev
, char *page
)
3414 struct md_personality
*p
;
3416 spin_lock(&mddev
->lock
);
3419 ret
= sprintf(page
, "%s\n", p
->name
);
3420 else if (mddev
->clevel
[0])
3421 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3422 else if (mddev
->level
!= LEVEL_NONE
)
3423 ret
= sprintf(page
, "%d\n", mddev
->level
);
3426 spin_unlock(&mddev
->lock
);
3431 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3436 struct md_personality
*pers
, *oldpers
;
3438 void *priv
, *oldpriv
;
3439 struct md_rdev
*rdev
;
3441 if (slen
== 0 || slen
>= sizeof(clevel
))
3444 rv
= mddev_lock(mddev
);
3448 if (mddev
->pers
== NULL
) {
3449 strncpy(mddev
->clevel
, buf
, slen
);
3450 if (mddev
->clevel
[slen
-1] == '\n')
3452 mddev
->clevel
[slen
] = 0;
3453 mddev
->level
= LEVEL_NONE
;
3461 /* request to change the personality. Need to ensure:
3462 * - array is not engaged in resync/recovery/reshape
3463 * - old personality can be suspended
3464 * - new personality will access other array.
3468 if (mddev
->sync_thread
||
3469 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3470 mddev
->reshape_position
!= MaxSector
||
3471 mddev
->sysfs_active
)
3475 if (!mddev
->pers
->quiesce
) {
3476 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3477 mdname(mddev
), mddev
->pers
->name
);
3481 /* Now find the new personality */
3482 strncpy(clevel
, buf
, slen
);
3483 if (clevel
[slen
-1] == '\n')
3486 if (kstrtol(clevel
, 10, &level
))
3489 if (request_module("md-%s", clevel
) != 0)
3490 request_module("md-level-%s", clevel
);
3491 spin_lock(&pers_lock
);
3492 pers
= find_pers(level
, clevel
);
3493 if (!pers
|| !try_module_get(pers
->owner
)) {
3494 spin_unlock(&pers_lock
);
3495 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3499 spin_unlock(&pers_lock
);
3501 if (pers
== mddev
->pers
) {
3502 /* Nothing to do! */
3503 module_put(pers
->owner
);
3507 if (!pers
->takeover
) {
3508 module_put(pers
->owner
);
3509 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3510 mdname(mddev
), clevel
);
3515 rdev_for_each(rdev
, mddev
)
3516 rdev
->new_raid_disk
= rdev
->raid_disk
;
3518 /* ->takeover must set new_* and/or delta_disks
3519 * if it succeeds, and may set them when it fails.
3521 priv
= pers
->takeover(mddev
);
3523 mddev
->new_level
= mddev
->level
;
3524 mddev
->new_layout
= mddev
->layout
;
3525 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3526 mddev
->raid_disks
-= mddev
->delta_disks
;
3527 mddev
->delta_disks
= 0;
3528 mddev
->reshape_backwards
= 0;
3529 module_put(pers
->owner
);
3530 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3531 mdname(mddev
), clevel
);
3536 /* Looks like we have a winner */
3537 mddev_suspend(mddev
);
3538 mddev_detach(mddev
);
3540 spin_lock(&mddev
->lock
);
3541 oldpers
= mddev
->pers
;
3542 oldpriv
= mddev
->private;
3544 mddev
->private = priv
;
3545 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3546 mddev
->level
= mddev
->new_level
;
3547 mddev
->layout
= mddev
->new_layout
;
3548 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3549 mddev
->delta_disks
= 0;
3550 mddev
->reshape_backwards
= 0;
3551 mddev
->degraded
= 0;
3552 spin_unlock(&mddev
->lock
);
3554 if (oldpers
->sync_request
== NULL
&&
3556 /* We are converting from a no-redundancy array
3557 * to a redundancy array and metadata is managed
3558 * externally so we need to be sure that writes
3559 * won't block due to a need to transition
3561 * until external management is started.
3564 mddev
->safemode_delay
= 0;
3565 mddev
->safemode
= 0;
3568 oldpers
->free(mddev
, oldpriv
);
3570 if (oldpers
->sync_request
== NULL
&&
3571 pers
->sync_request
!= NULL
) {
3572 /* need to add the md_redundancy_group */
3573 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3575 "md: cannot register extra attributes for %s\n",
3577 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3579 if (oldpers
->sync_request
!= NULL
&&
3580 pers
->sync_request
== NULL
) {
3581 /* need to remove the md_redundancy_group */
3582 if (mddev
->to_remove
== NULL
)
3583 mddev
->to_remove
= &md_redundancy_group
;
3586 rdev_for_each(rdev
, mddev
) {
3587 if (rdev
->raid_disk
< 0)
3589 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3590 rdev
->new_raid_disk
= -1;
3591 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3593 sysfs_unlink_rdev(mddev
, rdev
);
3595 rdev_for_each(rdev
, mddev
) {
3596 if (rdev
->raid_disk
< 0)
3598 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3600 rdev
->raid_disk
= rdev
->new_raid_disk
;
3601 if (rdev
->raid_disk
< 0)
3602 clear_bit(In_sync
, &rdev
->flags
);
3604 if (sysfs_link_rdev(mddev
, rdev
))
3605 printk(KERN_WARNING
"md: cannot register rd%d"
3606 " for %s after level change\n",
3607 rdev
->raid_disk
, mdname(mddev
));
3611 if (pers
->sync_request
== NULL
) {
3612 /* this is now an array without redundancy, so
3613 * it must always be in_sync
3616 del_timer_sync(&mddev
->safemode_timer
);
3618 blk_set_stacking_limits(&mddev
->queue
->limits
);
3620 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3621 mddev_resume(mddev
);
3623 md_update_sb(mddev
, 1);
3624 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3625 md_new_event(mddev
);
3628 mddev_unlock(mddev
);
3632 static struct md_sysfs_entry md_level
=
3633 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3636 layout_show(struct mddev
*mddev
, char *page
)
3638 /* just a number, not meaningful for all levels */
3639 if (mddev
->reshape_position
!= MaxSector
&&
3640 mddev
->layout
!= mddev
->new_layout
)
3641 return sprintf(page
, "%d (%d)\n",
3642 mddev
->new_layout
, mddev
->layout
);
3643 return sprintf(page
, "%d\n", mddev
->layout
);
3647 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3652 err
= kstrtouint(buf
, 10, &n
);
3655 err
= mddev_lock(mddev
);
3660 if (mddev
->pers
->check_reshape
== NULL
)
3665 mddev
->new_layout
= n
;
3666 err
= mddev
->pers
->check_reshape(mddev
);
3668 mddev
->new_layout
= mddev
->layout
;
3671 mddev
->new_layout
= n
;
3672 if (mddev
->reshape_position
== MaxSector
)
3675 mddev_unlock(mddev
);
3678 static struct md_sysfs_entry md_layout
=
3679 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3682 raid_disks_show(struct mddev
*mddev
, char *page
)
3684 if (mddev
->raid_disks
== 0)
3686 if (mddev
->reshape_position
!= MaxSector
&&
3687 mddev
->delta_disks
!= 0)
3688 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3689 mddev
->raid_disks
- mddev
->delta_disks
);
3690 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3693 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3696 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3701 err
= kstrtouint(buf
, 10, &n
);
3705 err
= mddev_lock(mddev
);
3709 err
= update_raid_disks(mddev
, n
);
3710 else if (mddev
->reshape_position
!= MaxSector
) {
3711 struct md_rdev
*rdev
;
3712 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3715 rdev_for_each(rdev
, mddev
) {
3717 rdev
->data_offset
< rdev
->new_data_offset
)
3720 rdev
->data_offset
> rdev
->new_data_offset
)
3724 mddev
->delta_disks
= n
- olddisks
;
3725 mddev
->raid_disks
= n
;
3726 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3728 mddev
->raid_disks
= n
;
3730 mddev_unlock(mddev
);
3731 return err
? err
: len
;
3733 static struct md_sysfs_entry md_raid_disks
=
3734 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3737 chunk_size_show(struct mddev
*mddev
, char *page
)
3739 if (mddev
->reshape_position
!= MaxSector
&&
3740 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3741 return sprintf(page
, "%d (%d)\n",
3742 mddev
->new_chunk_sectors
<< 9,
3743 mddev
->chunk_sectors
<< 9);
3744 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3748 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3753 err
= kstrtoul(buf
, 10, &n
);
3757 err
= mddev_lock(mddev
);
3761 if (mddev
->pers
->check_reshape
== NULL
)
3766 mddev
->new_chunk_sectors
= n
>> 9;
3767 err
= mddev
->pers
->check_reshape(mddev
);
3769 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3772 mddev
->new_chunk_sectors
= n
>> 9;
3773 if (mddev
->reshape_position
== MaxSector
)
3774 mddev
->chunk_sectors
= n
>> 9;
3776 mddev_unlock(mddev
);
3779 static struct md_sysfs_entry md_chunk_size
=
3780 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3783 resync_start_show(struct mddev
*mddev
, char *page
)
3785 if (mddev
->recovery_cp
== MaxSector
)
3786 return sprintf(page
, "none\n");
3787 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3791 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3793 unsigned long long n
;
3796 if (cmd_match(buf
, "none"))
3799 err
= kstrtoull(buf
, 10, &n
);
3802 if (n
!= (sector_t
)n
)
3806 err
= mddev_lock(mddev
);
3809 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3813 mddev
->recovery_cp
= n
;
3815 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3817 mddev_unlock(mddev
);
3820 static struct md_sysfs_entry md_resync_start
=
3821 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3822 resync_start_show
, resync_start_store
);
3825 * The array state can be:
3828 * No devices, no size, no level
3829 * Equivalent to STOP_ARRAY ioctl
3831 * May have some settings, but array is not active
3832 * all IO results in error
3833 * When written, doesn't tear down array, but just stops it
3834 * suspended (not supported yet)
3835 * All IO requests will block. The array can be reconfigured.
3836 * Writing this, if accepted, will block until array is quiescent
3838 * no resync can happen. no superblocks get written.
3839 * write requests fail
3841 * like readonly, but behaves like 'clean' on a write request.
3843 * clean - no pending writes, but otherwise active.
3844 * When written to inactive array, starts without resync
3845 * If a write request arrives then
3846 * if metadata is known, mark 'dirty' and switch to 'active'.
3847 * if not known, block and switch to write-pending
3848 * If written to an active array that has pending writes, then fails.
3850 * fully active: IO and resync can be happening.
3851 * When written to inactive array, starts with resync
3854 * clean, but writes are blocked waiting for 'active' to be written.
3857 * like active, but no writes have been seen for a while (100msec).
3860 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3861 write_pending
, active_idle
, bad_word
};
3862 static char *array_states
[] = {
3863 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3864 "write-pending", "active-idle", NULL
};
3866 static int match_word(const char *word
, char **list
)
3869 for (n
=0; list
[n
]; n
++)
3870 if (cmd_match(word
, list
[n
]))
3876 array_state_show(struct mddev
*mddev
, char *page
)
3878 enum array_state st
= inactive
;
3891 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3893 else if (mddev
->safemode
)
3899 if (list_empty(&mddev
->disks
) &&
3900 mddev
->raid_disks
== 0 &&
3901 mddev
->dev_sectors
== 0)
3906 return sprintf(page
, "%s\n", array_states
[st
]);
3909 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3910 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3911 static int do_md_run(struct mddev
*mddev
);
3912 static int restart_array(struct mddev
*mddev
);
3915 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3918 enum array_state st
= match_word(buf
, array_states
);
3920 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3921 /* don't take reconfig_mutex when toggling between
3924 spin_lock(&mddev
->lock
);
3926 restart_array(mddev
);
3927 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3928 wake_up(&mddev
->sb_wait
);
3930 } else /* st == clean */ {
3931 restart_array(mddev
);
3932 if (atomic_read(&mddev
->writes_pending
) == 0) {
3933 if (mddev
->in_sync
== 0) {
3935 if (mddev
->safemode
== 1)
3936 mddev
->safemode
= 0;
3937 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3943 spin_unlock(&mddev
->lock
);
3946 err
= mddev_lock(mddev
);
3954 /* stopping an active array */
3955 err
= do_md_stop(mddev
, 0, NULL
);
3958 /* stopping an active array */
3960 err
= do_md_stop(mddev
, 2, NULL
);
3962 err
= 0; /* already inactive */
3965 break; /* not supported yet */
3968 err
= md_set_readonly(mddev
, NULL
);
3971 set_disk_ro(mddev
->gendisk
, 1);
3972 err
= do_md_run(mddev
);
3978 err
= md_set_readonly(mddev
, NULL
);
3979 else if (mddev
->ro
== 1)
3980 err
= restart_array(mddev
);
3983 set_disk_ro(mddev
->gendisk
, 0);
3987 err
= do_md_run(mddev
);
3992 err
= restart_array(mddev
);
3995 spin_lock(&mddev
->lock
);
3996 if (atomic_read(&mddev
->writes_pending
) == 0) {
3997 if (mddev
->in_sync
== 0) {
3999 if (mddev
->safemode
== 1)
4000 mddev
->safemode
= 0;
4001 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
4006 spin_unlock(&mddev
->lock
);
4012 err
= restart_array(mddev
);
4015 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
4016 wake_up(&mddev
->sb_wait
);
4020 set_disk_ro(mddev
->gendisk
, 0);
4021 err
= do_md_run(mddev
);
4026 /* these cannot be set */
4031 if (mddev
->hold_active
== UNTIL_IOCTL
)
4032 mddev
->hold_active
= 0;
4033 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4035 mddev_unlock(mddev
);
4038 static struct md_sysfs_entry md_array_state
=
4039 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4042 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4043 return sprintf(page
, "%d\n",
4044 atomic_read(&mddev
->max_corr_read_errors
));
4048 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4053 rv
= kstrtouint(buf
, 10, &n
);
4056 atomic_set(&mddev
->max_corr_read_errors
, n
);
4060 static struct md_sysfs_entry max_corr_read_errors
=
4061 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4062 max_corrected_read_errors_store
);
4065 null_show(struct mddev
*mddev
, char *page
)
4071 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4073 /* buf must be %d:%d\n? giving major and minor numbers */
4074 /* The new device is added to the array.
4075 * If the array has a persistent superblock, we read the
4076 * superblock to initialise info and check validity.
4077 * Otherwise, only checking done is that in bind_rdev_to_array,
4078 * which mainly checks size.
4081 int major
= simple_strtoul(buf
, &e
, 10);
4084 struct md_rdev
*rdev
;
4087 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4089 minor
= simple_strtoul(e
+1, &e
, 10);
4090 if (*e
&& *e
!= '\n')
4092 dev
= MKDEV(major
, minor
);
4093 if (major
!= MAJOR(dev
) ||
4094 minor
!= MINOR(dev
))
4097 flush_workqueue(md_misc_wq
);
4099 err
= mddev_lock(mddev
);
4102 if (mddev
->persistent
) {
4103 rdev
= md_import_device(dev
, mddev
->major_version
,
4104 mddev
->minor_version
);
4105 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4106 struct md_rdev
*rdev0
4107 = list_entry(mddev
->disks
.next
,
4108 struct md_rdev
, same_set
);
4109 err
= super_types
[mddev
->major_version
]
4110 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4114 } else if (mddev
->external
)
4115 rdev
= md_import_device(dev
, -2, -1);
4117 rdev
= md_import_device(dev
, -1, -1);
4120 mddev_unlock(mddev
);
4121 return PTR_ERR(rdev
);
4123 err
= bind_rdev_to_array(rdev
, mddev
);
4127 mddev_unlock(mddev
);
4128 return err
? err
: len
;
4131 static struct md_sysfs_entry md_new_device
=
4132 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4135 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4138 unsigned long chunk
, end_chunk
;
4141 err
= mddev_lock(mddev
);
4146 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4148 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4149 if (buf
== end
) break;
4150 if (*end
== '-') { /* range */
4152 end_chunk
= simple_strtoul(buf
, &end
, 0);
4153 if (buf
== end
) break;
4155 if (*end
&& !isspace(*end
)) break;
4156 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4157 buf
= skip_spaces(end
);
4159 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4161 mddev_unlock(mddev
);
4165 static struct md_sysfs_entry md_bitmap
=
4166 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4169 size_show(struct mddev
*mddev
, char *page
)
4171 return sprintf(page
, "%llu\n",
4172 (unsigned long long)mddev
->dev_sectors
/ 2);
4175 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4178 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4180 /* If array is inactive, we can reduce the component size, but
4181 * not increase it (except from 0).
4182 * If array is active, we can try an on-line resize
4185 int err
= strict_blocks_to_sectors(buf
, §ors
);
4189 err
= mddev_lock(mddev
);
4193 err
= update_size(mddev
, sectors
);
4194 md_update_sb(mddev
, 1);
4196 if (mddev
->dev_sectors
== 0 ||
4197 mddev
->dev_sectors
> sectors
)
4198 mddev
->dev_sectors
= sectors
;
4202 mddev_unlock(mddev
);
4203 return err
? err
: len
;
4206 static struct md_sysfs_entry md_size
=
4207 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4209 /* Metadata version.
4211 * 'none' for arrays with no metadata (good luck...)
4212 * 'external' for arrays with externally managed metadata,
4213 * or N.M for internally known formats
4216 metadata_show(struct mddev
*mddev
, char *page
)
4218 if (mddev
->persistent
)
4219 return sprintf(page
, "%d.%d\n",
4220 mddev
->major_version
, mddev
->minor_version
);
4221 else if (mddev
->external
)
4222 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4224 return sprintf(page
, "none\n");
4228 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4233 /* Changing the details of 'external' metadata is
4234 * always permitted. Otherwise there must be
4235 * no devices attached to the array.
4238 err
= mddev_lock(mddev
);
4242 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4244 else if (!list_empty(&mddev
->disks
))
4248 if (cmd_match(buf
, "none")) {
4249 mddev
->persistent
= 0;
4250 mddev
->external
= 0;
4251 mddev
->major_version
= 0;
4252 mddev
->minor_version
= 90;
4255 if (strncmp(buf
, "external:", 9) == 0) {
4256 size_t namelen
= len
-9;
4257 if (namelen
>= sizeof(mddev
->metadata_type
))
4258 namelen
= sizeof(mddev
->metadata_type
)-1;
4259 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4260 mddev
->metadata_type
[namelen
] = 0;
4261 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4262 mddev
->metadata_type
[--namelen
] = 0;
4263 mddev
->persistent
= 0;
4264 mddev
->external
= 1;
4265 mddev
->major_version
= 0;
4266 mddev
->minor_version
= 90;
4269 major
= simple_strtoul(buf
, &e
, 10);
4271 if (e
==buf
|| *e
!= '.')
4274 minor
= simple_strtoul(buf
, &e
, 10);
4275 if (e
==buf
|| (*e
&& *e
!= '\n') )
4278 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4280 mddev
->major_version
= major
;
4281 mddev
->minor_version
= minor
;
4282 mddev
->persistent
= 1;
4283 mddev
->external
= 0;
4286 mddev_unlock(mddev
);
4290 static struct md_sysfs_entry md_metadata
=
4291 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4294 action_show(struct mddev
*mddev
, char *page
)
4296 char *type
= "idle";
4297 unsigned long recovery
= mddev
->recovery
;
4298 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4300 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4301 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4302 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4304 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4305 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4307 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4311 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4313 else if (mddev
->reshape_position
!= MaxSector
)
4316 return sprintf(page
, "%s\n", type
);
4320 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4322 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4326 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4327 if (cmd_match(page
, "frozen"))
4328 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4330 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4331 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4332 mddev_lock(mddev
) == 0) {
4333 flush_workqueue(md_misc_wq
);
4334 if (mddev
->sync_thread
) {
4335 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4336 md_reap_sync_thread(mddev
);
4338 mddev_unlock(mddev
);
4340 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4342 else if (cmd_match(page
, "resync"))
4343 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4344 else if (cmd_match(page
, "recover")) {
4345 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4346 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4347 } else if (cmd_match(page
, "reshape")) {
4349 if (mddev
->pers
->start_reshape
== NULL
)
4351 err
= mddev_lock(mddev
);
4353 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4356 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4357 err
= mddev
->pers
->start_reshape(mddev
);
4359 mddev_unlock(mddev
);
4363 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4365 if (cmd_match(page
, "check"))
4366 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4367 else if (!cmd_match(page
, "repair"))
4369 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4370 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4371 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4373 if (mddev
->ro
== 2) {
4374 /* A write to sync_action is enough to justify
4375 * canceling read-auto mode
4378 md_wakeup_thread(mddev
->sync_thread
);
4380 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4381 md_wakeup_thread(mddev
->thread
);
4382 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4386 static struct md_sysfs_entry md_scan_mode
=
4387 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4390 last_sync_action_show(struct mddev
*mddev
, char *page
)
4392 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4395 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4398 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4400 return sprintf(page
, "%llu\n",
4401 (unsigned long long)
4402 atomic64_read(&mddev
->resync_mismatches
));
4405 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4408 sync_min_show(struct mddev
*mddev
, char *page
)
4410 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4411 mddev
->sync_speed_min
? "local": "system");
4415 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4420 if (strncmp(buf
, "system", 6)==0) {
4423 rv
= kstrtouint(buf
, 10, &min
);
4429 mddev
->sync_speed_min
= min
;
4433 static struct md_sysfs_entry md_sync_min
=
4434 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4437 sync_max_show(struct mddev
*mddev
, char *page
)
4439 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4440 mddev
->sync_speed_max
? "local": "system");
4444 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4449 if (strncmp(buf
, "system", 6)==0) {
4452 rv
= kstrtouint(buf
, 10, &max
);
4458 mddev
->sync_speed_max
= max
;
4462 static struct md_sysfs_entry md_sync_max
=
4463 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4466 degraded_show(struct mddev
*mddev
, char *page
)
4468 return sprintf(page
, "%d\n", mddev
->degraded
);
4470 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4473 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4475 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4479 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4483 if (kstrtol(buf
, 10, &n
))
4486 if (n
!= 0 && n
!= 1)
4489 mddev
->parallel_resync
= n
;
4491 if (mddev
->sync_thread
)
4492 wake_up(&resync_wait
);
4497 /* force parallel resync, even with shared block devices */
4498 static struct md_sysfs_entry md_sync_force_parallel
=
4499 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4500 sync_force_parallel_show
, sync_force_parallel_store
);
4503 sync_speed_show(struct mddev
*mddev
, char *page
)
4505 unsigned long resync
, dt
, db
;
4506 if (mddev
->curr_resync
== 0)
4507 return sprintf(page
, "none\n");
4508 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4509 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4511 db
= resync
- mddev
->resync_mark_cnt
;
4512 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4515 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4518 sync_completed_show(struct mddev
*mddev
, char *page
)
4520 unsigned long long max_sectors
, resync
;
4522 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4523 return sprintf(page
, "none\n");
4525 if (mddev
->curr_resync
== 1 ||
4526 mddev
->curr_resync
== 2)
4527 return sprintf(page
, "delayed\n");
4529 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4530 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4531 max_sectors
= mddev
->resync_max_sectors
;
4533 max_sectors
= mddev
->dev_sectors
;
4535 resync
= mddev
->curr_resync_completed
;
4536 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4539 static struct md_sysfs_entry md_sync_completed
=
4540 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4543 min_sync_show(struct mddev
*mddev
, char *page
)
4545 return sprintf(page
, "%llu\n",
4546 (unsigned long long)mddev
->resync_min
);
4549 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4551 unsigned long long min
;
4554 if (kstrtoull(buf
, 10, &min
))
4557 spin_lock(&mddev
->lock
);
4559 if (min
> mddev
->resync_max
)
4563 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4566 /* Round down to multiple of 4K for safety */
4567 mddev
->resync_min
= round_down(min
, 8);
4571 spin_unlock(&mddev
->lock
);
4575 static struct md_sysfs_entry md_min_sync
=
4576 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4579 max_sync_show(struct mddev
*mddev
, char *page
)
4581 if (mddev
->resync_max
== MaxSector
)
4582 return sprintf(page
, "max\n");
4584 return sprintf(page
, "%llu\n",
4585 (unsigned long long)mddev
->resync_max
);
4588 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4591 spin_lock(&mddev
->lock
);
4592 if (strncmp(buf
, "max", 3) == 0)
4593 mddev
->resync_max
= MaxSector
;
4595 unsigned long long max
;
4599 if (kstrtoull(buf
, 10, &max
))
4601 if (max
< mddev
->resync_min
)
4605 if (max
< mddev
->resync_max
&&
4607 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4610 /* Must be a multiple of chunk_size */
4611 chunk
= mddev
->chunk_sectors
;
4613 sector_t temp
= max
;
4616 if (sector_div(temp
, chunk
))
4619 mddev
->resync_max
= max
;
4621 wake_up(&mddev
->recovery_wait
);
4624 spin_unlock(&mddev
->lock
);
4628 static struct md_sysfs_entry md_max_sync
=
4629 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4632 suspend_lo_show(struct mddev
*mddev
, char *page
)
4634 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4638 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4640 unsigned long long old
, new;
4643 err
= kstrtoull(buf
, 10, &new);
4646 if (new != (sector_t
)new)
4649 err
= mddev_lock(mddev
);
4653 if (mddev
->pers
== NULL
||
4654 mddev
->pers
->quiesce
== NULL
)
4656 old
= mddev
->suspend_lo
;
4657 mddev
->suspend_lo
= new;
4659 /* Shrinking suspended region */
4660 mddev
->pers
->quiesce(mddev
, 2);
4662 /* Expanding suspended region - need to wait */
4663 mddev
->pers
->quiesce(mddev
, 1);
4664 mddev
->pers
->quiesce(mddev
, 0);
4668 mddev_unlock(mddev
);
4671 static struct md_sysfs_entry md_suspend_lo
=
4672 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4675 suspend_hi_show(struct mddev
*mddev
, char *page
)
4677 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4681 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4683 unsigned long long old
, new;
4686 err
= kstrtoull(buf
, 10, &new);
4689 if (new != (sector_t
)new)
4692 err
= mddev_lock(mddev
);
4696 if (mddev
->pers
== NULL
||
4697 mddev
->pers
->quiesce
== NULL
)
4699 old
= mddev
->suspend_hi
;
4700 mddev
->suspend_hi
= new;
4702 /* Shrinking suspended region */
4703 mddev
->pers
->quiesce(mddev
, 2);
4705 /* Expanding suspended region - need to wait */
4706 mddev
->pers
->quiesce(mddev
, 1);
4707 mddev
->pers
->quiesce(mddev
, 0);
4711 mddev_unlock(mddev
);
4714 static struct md_sysfs_entry md_suspend_hi
=
4715 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4718 reshape_position_show(struct mddev
*mddev
, char *page
)
4720 if (mddev
->reshape_position
!= MaxSector
)
4721 return sprintf(page
, "%llu\n",
4722 (unsigned long long)mddev
->reshape_position
);
4723 strcpy(page
, "none\n");
4728 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4730 struct md_rdev
*rdev
;
4731 unsigned long long new;
4734 err
= kstrtoull(buf
, 10, &new);
4737 if (new != (sector_t
)new)
4739 err
= mddev_lock(mddev
);
4745 mddev
->reshape_position
= new;
4746 mddev
->delta_disks
= 0;
4747 mddev
->reshape_backwards
= 0;
4748 mddev
->new_level
= mddev
->level
;
4749 mddev
->new_layout
= mddev
->layout
;
4750 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4751 rdev_for_each(rdev
, mddev
)
4752 rdev
->new_data_offset
= rdev
->data_offset
;
4755 mddev_unlock(mddev
);
4759 static struct md_sysfs_entry md_reshape_position
=
4760 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4761 reshape_position_store
);
4764 reshape_direction_show(struct mddev
*mddev
, char *page
)
4766 return sprintf(page
, "%s\n",
4767 mddev
->reshape_backwards
? "backwards" : "forwards");
4771 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4776 if (cmd_match(buf
, "forwards"))
4778 else if (cmd_match(buf
, "backwards"))
4782 if (mddev
->reshape_backwards
== backwards
)
4785 err
= mddev_lock(mddev
);
4788 /* check if we are allowed to change */
4789 if (mddev
->delta_disks
)
4791 else if (mddev
->persistent
&&
4792 mddev
->major_version
== 0)
4795 mddev
->reshape_backwards
= backwards
;
4796 mddev_unlock(mddev
);
4800 static struct md_sysfs_entry md_reshape_direction
=
4801 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4802 reshape_direction_store
);
4805 array_size_show(struct mddev
*mddev
, char *page
)
4807 if (mddev
->external_size
)
4808 return sprintf(page
, "%llu\n",
4809 (unsigned long long)mddev
->array_sectors
/2);
4811 return sprintf(page
, "default\n");
4815 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4820 err
= mddev_lock(mddev
);
4824 /* cluster raid doesn't support change array_sectors */
4825 if (mddev_is_clustered(mddev
))
4828 if (strncmp(buf
, "default", 7) == 0) {
4830 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4832 sectors
= mddev
->array_sectors
;
4834 mddev
->external_size
= 0;
4836 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4838 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4841 mddev
->external_size
= 1;
4845 mddev
->array_sectors
= sectors
;
4847 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4848 revalidate_disk(mddev
->gendisk
);
4851 mddev_unlock(mddev
);
4855 static struct md_sysfs_entry md_array_size
=
4856 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4859 static struct attribute
*md_default_attrs
[] = {
4862 &md_raid_disks
.attr
,
4863 &md_chunk_size
.attr
,
4865 &md_resync_start
.attr
,
4867 &md_new_device
.attr
,
4868 &md_safe_delay
.attr
,
4869 &md_array_state
.attr
,
4870 &md_reshape_position
.attr
,
4871 &md_reshape_direction
.attr
,
4872 &md_array_size
.attr
,
4873 &max_corr_read_errors
.attr
,
4877 static struct attribute
*md_redundancy_attrs
[] = {
4879 &md_last_scan_mode
.attr
,
4880 &md_mismatches
.attr
,
4883 &md_sync_speed
.attr
,
4884 &md_sync_force_parallel
.attr
,
4885 &md_sync_completed
.attr
,
4888 &md_suspend_lo
.attr
,
4889 &md_suspend_hi
.attr
,
4894 static struct attribute_group md_redundancy_group
= {
4896 .attrs
= md_redundancy_attrs
,
4900 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4902 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4903 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4908 spin_lock(&all_mddevs_lock
);
4909 if (list_empty(&mddev
->all_mddevs
)) {
4910 spin_unlock(&all_mddevs_lock
);
4914 spin_unlock(&all_mddevs_lock
);
4916 rv
= entry
->show(mddev
, page
);
4922 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4923 const char *page
, size_t length
)
4925 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4926 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4931 if (!capable(CAP_SYS_ADMIN
))
4933 spin_lock(&all_mddevs_lock
);
4934 if (list_empty(&mddev
->all_mddevs
)) {
4935 spin_unlock(&all_mddevs_lock
);
4939 spin_unlock(&all_mddevs_lock
);
4940 rv
= entry
->store(mddev
, page
, length
);
4945 static void md_free(struct kobject
*ko
)
4947 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4949 if (mddev
->sysfs_state
)
4950 sysfs_put(mddev
->sysfs_state
);
4953 blk_cleanup_queue(mddev
->queue
);
4954 if (mddev
->gendisk
) {
4955 del_gendisk(mddev
->gendisk
);
4956 put_disk(mddev
->gendisk
);
4962 static const struct sysfs_ops md_sysfs_ops
= {
4963 .show
= md_attr_show
,
4964 .store
= md_attr_store
,
4966 static struct kobj_type md_ktype
= {
4968 .sysfs_ops
= &md_sysfs_ops
,
4969 .default_attrs
= md_default_attrs
,
4974 static void mddev_delayed_delete(struct work_struct
*ws
)
4976 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4978 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4979 kobject_del(&mddev
->kobj
);
4980 kobject_put(&mddev
->kobj
);
4983 static int md_alloc(dev_t dev
, char *name
)
4985 static DEFINE_MUTEX(disks_mutex
);
4986 struct mddev
*mddev
= mddev_find(dev
);
4987 struct gendisk
*disk
;
4996 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4997 shift
= partitioned
? MdpMinorShift
: 0;
4998 unit
= MINOR(mddev
->unit
) >> shift
;
5000 /* wait for any previous instance of this device to be
5001 * completely removed (mddev_delayed_delete).
5003 flush_workqueue(md_misc_wq
);
5005 mutex_lock(&disks_mutex
);
5011 /* Need to ensure that 'name' is not a duplicate.
5013 struct mddev
*mddev2
;
5014 spin_lock(&all_mddevs_lock
);
5016 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5017 if (mddev2
->gendisk
&&
5018 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5019 spin_unlock(&all_mddevs_lock
);
5022 spin_unlock(&all_mddevs_lock
);
5026 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5029 mddev
->queue
->queuedata
= mddev
;
5031 blk_queue_make_request(mddev
->queue
, md_make_request
);
5032 blk_set_stacking_limits(&mddev
->queue
->limits
);
5034 disk
= alloc_disk(1 << shift
);
5036 blk_cleanup_queue(mddev
->queue
);
5037 mddev
->queue
= NULL
;
5040 disk
->major
= MAJOR(mddev
->unit
);
5041 disk
->first_minor
= unit
<< shift
;
5043 strcpy(disk
->disk_name
, name
);
5044 else if (partitioned
)
5045 sprintf(disk
->disk_name
, "md_d%d", unit
);
5047 sprintf(disk
->disk_name
, "md%d", unit
);
5048 disk
->fops
= &md_fops
;
5049 disk
->private_data
= mddev
;
5050 disk
->queue
= mddev
->queue
;
5051 blk_queue_write_cache(mddev
->queue
, true, true);
5052 /* Allow extended partitions. This makes the
5053 * 'mdp' device redundant, but we can't really
5056 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5057 mddev
->gendisk
= disk
;
5058 /* As soon as we call add_disk(), another thread could get
5059 * through to md_open, so make sure it doesn't get too far
5061 mutex_lock(&mddev
->open_mutex
);
5064 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5065 &disk_to_dev(disk
)->kobj
, "%s", "md");
5067 /* This isn't possible, but as kobject_init_and_add is marked
5068 * __must_check, we must do something with the result
5070 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
5074 if (mddev
->kobj
.sd
&&
5075 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5076 printk(KERN_DEBUG
"pointless warning\n");
5077 mutex_unlock(&mddev
->open_mutex
);
5079 mutex_unlock(&disks_mutex
);
5080 if (!error
&& mddev
->kobj
.sd
) {
5081 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5082 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5088 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5090 md_alloc(dev
, NULL
);
5094 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5096 /* val must be "md_*" where * is not all digits.
5097 * We allocate an array with a large free minor number, and
5098 * set the name to val. val must not already be an active name.
5100 int len
= strlen(val
);
5101 char buf
[DISK_NAME_LEN
];
5103 while (len
&& val
[len
-1] == '\n')
5105 if (len
>= DISK_NAME_LEN
)
5107 strlcpy(buf
, val
, len
+1);
5108 if (strncmp(buf
, "md_", 3) != 0)
5110 return md_alloc(0, buf
);
5113 static void md_safemode_timeout(unsigned long data
)
5115 struct mddev
*mddev
= (struct mddev
*) data
;
5117 if (!atomic_read(&mddev
->writes_pending
)) {
5118 mddev
->safemode
= 1;
5119 if (mddev
->external
)
5120 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5122 md_wakeup_thread(mddev
->thread
);
5125 static int start_dirty_degraded
;
5127 int md_run(struct mddev
*mddev
)
5130 struct md_rdev
*rdev
;
5131 struct md_personality
*pers
;
5133 if (list_empty(&mddev
->disks
))
5134 /* cannot run an array with no devices.. */
5139 /* Cannot run until previous stop completes properly */
5140 if (mddev
->sysfs_active
)
5144 * Analyze all RAID superblock(s)
5146 if (!mddev
->raid_disks
) {
5147 if (!mddev
->persistent
)
5152 if (mddev
->level
!= LEVEL_NONE
)
5153 request_module("md-level-%d", mddev
->level
);
5154 else if (mddev
->clevel
[0])
5155 request_module("md-%s", mddev
->clevel
);
5158 * Drop all container device buffers, from now on
5159 * the only valid external interface is through the md
5162 rdev_for_each(rdev
, mddev
) {
5163 if (test_bit(Faulty
, &rdev
->flags
))
5165 sync_blockdev(rdev
->bdev
);
5166 invalidate_bdev(rdev
->bdev
);
5168 /* perform some consistency tests on the device.
5169 * We don't want the data to overlap the metadata,
5170 * Internal Bitmap issues have been handled elsewhere.
5172 if (rdev
->meta_bdev
) {
5173 /* Nothing to check */;
5174 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5175 if (mddev
->dev_sectors
&&
5176 rdev
->data_offset
+ mddev
->dev_sectors
5178 printk("md: %s: data overlaps metadata\n",
5183 if (rdev
->sb_start
+ rdev
->sb_size
/512
5184 > rdev
->data_offset
) {
5185 printk("md: %s: metadata overlaps data\n",
5190 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5193 if (mddev
->bio_set
== NULL
)
5194 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5196 spin_lock(&pers_lock
);
5197 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5198 if (!pers
|| !try_module_get(pers
->owner
)) {
5199 spin_unlock(&pers_lock
);
5200 if (mddev
->level
!= LEVEL_NONE
)
5201 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5204 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5208 spin_unlock(&pers_lock
);
5209 if (mddev
->level
!= pers
->level
) {
5210 mddev
->level
= pers
->level
;
5211 mddev
->new_level
= pers
->level
;
5213 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5215 if (mddev
->reshape_position
!= MaxSector
&&
5216 pers
->start_reshape
== NULL
) {
5217 /* This personality cannot handle reshaping... */
5218 module_put(pers
->owner
);
5222 if (pers
->sync_request
) {
5223 /* Warn if this is a potentially silly
5226 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5227 struct md_rdev
*rdev2
;
5230 rdev_for_each(rdev
, mddev
)
5231 rdev_for_each(rdev2
, mddev
) {
5233 rdev
->bdev
->bd_contains
==
5234 rdev2
->bdev
->bd_contains
) {
5236 "%s: WARNING: %s appears to be"
5237 " on the same physical disk as"
5240 bdevname(rdev
->bdev
,b
),
5241 bdevname(rdev2
->bdev
,b2
));
5248 "True protection against single-disk"
5249 " failure might be compromised.\n");
5252 mddev
->recovery
= 0;
5253 /* may be over-ridden by personality */
5254 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5256 mddev
->ok_start_degraded
= start_dirty_degraded
;
5258 if (start_readonly
&& mddev
->ro
== 0)
5259 mddev
->ro
= 2; /* read-only, but switch on first write */
5261 err
= pers
->run(mddev
);
5263 printk(KERN_ERR
"md: pers->run() failed ...\n");
5264 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5265 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5266 " but 'external_size' not in effect?\n", __func__
);
5268 "md: invalid array_size %llu > default size %llu\n",
5269 (unsigned long long)mddev
->array_sectors
/ 2,
5270 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5273 if (err
== 0 && pers
->sync_request
&&
5274 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5275 struct bitmap
*bitmap
;
5277 bitmap
= bitmap_create(mddev
, -1);
5278 if (IS_ERR(bitmap
)) {
5279 err
= PTR_ERR(bitmap
);
5280 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5281 mdname(mddev
), err
);
5283 mddev
->bitmap
= bitmap
;
5287 mddev_detach(mddev
);
5289 pers
->free(mddev
, mddev
->private);
5290 mddev
->private = NULL
;
5291 module_put(pers
->owner
);
5292 bitmap_destroy(mddev
);
5296 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5297 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5299 if (pers
->sync_request
) {
5300 if (mddev
->kobj
.sd
&&
5301 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5303 "md: cannot register extra attributes for %s\n",
5305 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5306 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5309 atomic_set(&mddev
->writes_pending
,0);
5310 atomic_set(&mddev
->max_corr_read_errors
,
5311 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5312 mddev
->safemode
= 0;
5313 if (mddev_is_clustered(mddev
))
5314 mddev
->safemode_delay
= 0;
5316 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5319 spin_lock(&mddev
->lock
);
5321 spin_unlock(&mddev
->lock
);
5322 rdev_for_each(rdev
, mddev
)
5323 if (rdev
->raid_disk
>= 0)
5324 if (sysfs_link_rdev(mddev
, rdev
))
5325 /* failure here is OK */;
5327 if (mddev
->degraded
&& !mddev
->ro
)
5328 /* This ensures that recovering status is reported immediately
5329 * via sysfs - until a lack of spares is confirmed.
5331 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5332 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5334 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5335 md_update_sb(mddev
, 0);
5337 md_new_event(mddev
);
5338 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5339 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5340 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5343 EXPORT_SYMBOL_GPL(md_run
);
5345 static int do_md_run(struct mddev
*mddev
)
5349 err
= md_run(mddev
);
5352 err
= bitmap_load(mddev
);
5354 bitmap_destroy(mddev
);
5358 if (mddev_is_clustered(mddev
))
5359 md_allow_write(mddev
);
5361 md_wakeup_thread(mddev
->thread
);
5362 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5364 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5365 revalidate_disk(mddev
->gendisk
);
5367 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5372 static int restart_array(struct mddev
*mddev
)
5374 struct gendisk
*disk
= mddev
->gendisk
;
5376 /* Complain if it has no devices */
5377 if (list_empty(&mddev
->disks
))
5383 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5384 struct md_rdev
*rdev
;
5385 bool has_journal
= false;
5388 rdev_for_each_rcu(rdev
, mddev
) {
5389 if (test_bit(Journal
, &rdev
->flags
) &&
5390 !test_bit(Faulty
, &rdev
->flags
)) {
5397 /* Don't restart rw with journal missing/faulty */
5402 mddev
->safemode
= 0;
5404 set_disk_ro(disk
, 0);
5405 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5407 /* Kick recovery or resync if necessary */
5408 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5409 md_wakeup_thread(mddev
->thread
);
5410 md_wakeup_thread(mddev
->sync_thread
);
5411 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5415 static void md_clean(struct mddev
*mddev
)
5417 mddev
->array_sectors
= 0;
5418 mddev
->external_size
= 0;
5419 mddev
->dev_sectors
= 0;
5420 mddev
->raid_disks
= 0;
5421 mddev
->recovery_cp
= 0;
5422 mddev
->resync_min
= 0;
5423 mddev
->resync_max
= MaxSector
;
5424 mddev
->reshape_position
= MaxSector
;
5425 mddev
->external
= 0;
5426 mddev
->persistent
= 0;
5427 mddev
->level
= LEVEL_NONE
;
5428 mddev
->clevel
[0] = 0;
5431 mddev
->metadata_type
[0] = 0;
5432 mddev
->chunk_sectors
= 0;
5433 mddev
->ctime
= mddev
->utime
= 0;
5435 mddev
->max_disks
= 0;
5437 mddev
->can_decrease_events
= 0;
5438 mddev
->delta_disks
= 0;
5439 mddev
->reshape_backwards
= 0;
5440 mddev
->new_level
= LEVEL_NONE
;
5441 mddev
->new_layout
= 0;
5442 mddev
->new_chunk_sectors
= 0;
5443 mddev
->curr_resync
= 0;
5444 atomic64_set(&mddev
->resync_mismatches
, 0);
5445 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5446 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5447 mddev
->recovery
= 0;
5450 mddev
->degraded
= 0;
5451 mddev
->safemode
= 0;
5452 mddev
->private = NULL
;
5453 mddev
->bitmap_info
.offset
= 0;
5454 mddev
->bitmap_info
.default_offset
= 0;
5455 mddev
->bitmap_info
.default_space
= 0;
5456 mddev
->bitmap_info
.chunksize
= 0;
5457 mddev
->bitmap_info
.daemon_sleep
= 0;
5458 mddev
->bitmap_info
.max_write_behind
= 0;
5461 static void __md_stop_writes(struct mddev
*mddev
)
5463 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5464 flush_workqueue(md_misc_wq
);
5465 if (mddev
->sync_thread
) {
5466 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5467 md_reap_sync_thread(mddev
);
5470 del_timer_sync(&mddev
->safemode_timer
);
5472 bitmap_flush(mddev
);
5473 md_super_wait(mddev
);
5475 if (mddev
->ro
== 0 &&
5476 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5477 (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5478 /* mark array as shutdown cleanly */
5479 if (!mddev_is_clustered(mddev
))
5481 md_update_sb(mddev
, 1);
5485 void md_stop_writes(struct mddev
*mddev
)
5487 mddev_lock_nointr(mddev
);
5488 __md_stop_writes(mddev
);
5489 mddev_unlock(mddev
);
5491 EXPORT_SYMBOL_GPL(md_stop_writes
);
5493 static void mddev_detach(struct mddev
*mddev
)
5495 struct bitmap
*bitmap
= mddev
->bitmap
;
5496 /* wait for behind writes to complete */
5497 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5498 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5500 /* need to kick something here to make sure I/O goes? */
5501 wait_event(bitmap
->behind_wait
,
5502 atomic_read(&bitmap
->behind_writes
) == 0);
5504 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5505 mddev
->pers
->quiesce(mddev
, 1);
5506 mddev
->pers
->quiesce(mddev
, 0);
5508 md_unregister_thread(&mddev
->thread
);
5510 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5513 static void __md_stop(struct mddev
*mddev
)
5515 struct md_personality
*pers
= mddev
->pers
;
5516 mddev_detach(mddev
);
5517 /* Ensure ->event_work is done */
5518 flush_workqueue(md_misc_wq
);
5519 spin_lock(&mddev
->lock
);
5521 spin_unlock(&mddev
->lock
);
5522 pers
->free(mddev
, mddev
->private);
5523 mddev
->private = NULL
;
5524 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5525 mddev
->to_remove
= &md_redundancy_group
;
5526 module_put(pers
->owner
);
5527 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5530 void md_stop(struct mddev
*mddev
)
5532 /* stop the array and free an attached data structures.
5533 * This is called from dm-raid
5536 bitmap_destroy(mddev
);
5538 bioset_free(mddev
->bio_set
);
5541 EXPORT_SYMBOL_GPL(md_stop
);
5543 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5548 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5550 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5551 md_wakeup_thread(mddev
->thread
);
5553 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5554 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5555 if (mddev
->sync_thread
)
5556 /* Thread might be blocked waiting for metadata update
5557 * which will now never happen */
5558 wake_up_process(mddev
->sync_thread
->tsk
);
5560 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5562 mddev_unlock(mddev
);
5563 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5565 wait_event(mddev
->sb_wait
,
5566 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5567 mddev_lock_nointr(mddev
);
5569 mutex_lock(&mddev
->open_mutex
);
5570 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5571 mddev
->sync_thread
||
5572 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5573 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5574 printk("md: %s still in use.\n",mdname(mddev
));
5576 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5577 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5578 md_wakeup_thread(mddev
->thread
);
5584 __md_stop_writes(mddev
);
5590 set_disk_ro(mddev
->gendisk
, 1);
5591 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5592 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5593 md_wakeup_thread(mddev
->thread
);
5594 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5598 mutex_unlock(&mddev
->open_mutex
);
5603 * 0 - completely stop and dis-assemble array
5604 * 2 - stop but do not disassemble array
5606 static int do_md_stop(struct mddev
*mddev
, int mode
,
5607 struct block_device
*bdev
)
5609 struct gendisk
*disk
= mddev
->gendisk
;
5610 struct md_rdev
*rdev
;
5613 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5615 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5616 md_wakeup_thread(mddev
->thread
);
5618 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5619 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5620 if (mddev
->sync_thread
)
5621 /* Thread might be blocked waiting for metadata update
5622 * which will now never happen */
5623 wake_up_process(mddev
->sync_thread
->tsk
);
5625 mddev_unlock(mddev
);
5626 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5627 !test_bit(MD_RECOVERY_RUNNING
,
5628 &mddev
->recovery
)));
5629 mddev_lock_nointr(mddev
);
5631 mutex_lock(&mddev
->open_mutex
);
5632 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5633 mddev
->sysfs_active
||
5634 mddev
->sync_thread
||
5635 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5636 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5637 printk("md: %s still in use.\n",mdname(mddev
));
5638 mutex_unlock(&mddev
->open_mutex
);
5640 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5641 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5642 md_wakeup_thread(mddev
->thread
);
5648 set_disk_ro(disk
, 0);
5650 __md_stop_writes(mddev
);
5652 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5654 /* tell userspace to handle 'inactive' */
5655 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5657 rdev_for_each(rdev
, mddev
)
5658 if (rdev
->raid_disk
>= 0)
5659 sysfs_unlink_rdev(mddev
, rdev
);
5661 set_capacity(disk
, 0);
5662 mutex_unlock(&mddev
->open_mutex
);
5664 revalidate_disk(disk
);
5669 mutex_unlock(&mddev
->open_mutex
);
5671 * Free resources if final stop
5674 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5676 bitmap_destroy(mddev
);
5677 if (mddev
->bitmap_info
.file
) {
5678 struct file
*f
= mddev
->bitmap_info
.file
;
5679 spin_lock(&mddev
->lock
);
5680 mddev
->bitmap_info
.file
= NULL
;
5681 spin_unlock(&mddev
->lock
);
5684 mddev
->bitmap_info
.offset
= 0;
5686 export_array(mddev
);
5689 if (mddev
->hold_active
== UNTIL_STOP
)
5690 mddev
->hold_active
= 0;
5692 md_new_event(mddev
);
5693 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5698 static void autorun_array(struct mddev
*mddev
)
5700 struct md_rdev
*rdev
;
5703 if (list_empty(&mddev
->disks
))
5706 printk(KERN_INFO
"md: running: ");
5708 rdev_for_each(rdev
, mddev
) {
5709 char b
[BDEVNAME_SIZE
];
5710 printk("<%s>", bdevname(rdev
->bdev
,b
));
5714 err
= do_md_run(mddev
);
5716 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5717 do_md_stop(mddev
, 0, NULL
);
5722 * lets try to run arrays based on all disks that have arrived
5723 * until now. (those are in pending_raid_disks)
5725 * the method: pick the first pending disk, collect all disks with
5726 * the same UUID, remove all from the pending list and put them into
5727 * the 'same_array' list. Then order this list based on superblock
5728 * update time (freshest comes first), kick out 'old' disks and
5729 * compare superblocks. If everything's fine then run it.
5731 * If "unit" is allocated, then bump its reference count
5733 static void autorun_devices(int part
)
5735 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5736 struct mddev
*mddev
;
5737 char b
[BDEVNAME_SIZE
];
5739 printk(KERN_INFO
"md: autorun ...\n");
5740 while (!list_empty(&pending_raid_disks
)) {
5743 LIST_HEAD(candidates
);
5744 rdev0
= list_entry(pending_raid_disks
.next
,
5745 struct md_rdev
, same_set
);
5747 printk(KERN_INFO
"md: considering %s ...\n",
5748 bdevname(rdev0
->bdev
,b
));
5749 INIT_LIST_HEAD(&candidates
);
5750 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5751 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5752 printk(KERN_INFO
"md: adding %s ...\n",
5753 bdevname(rdev
->bdev
,b
));
5754 list_move(&rdev
->same_set
, &candidates
);
5757 * now we have a set of devices, with all of them having
5758 * mostly sane superblocks. It's time to allocate the
5762 dev
= MKDEV(mdp_major
,
5763 rdev0
->preferred_minor
<< MdpMinorShift
);
5764 unit
= MINOR(dev
) >> MdpMinorShift
;
5766 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5769 if (rdev0
->preferred_minor
!= unit
) {
5770 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5771 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5775 md_probe(dev
, NULL
, NULL
);
5776 mddev
= mddev_find(dev
);
5777 if (!mddev
|| !mddev
->gendisk
) {
5781 "md: cannot allocate memory for md drive.\n");
5784 if (mddev_lock(mddev
))
5785 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5787 else if (mddev
->raid_disks
|| mddev
->major_version
5788 || !list_empty(&mddev
->disks
)) {
5790 "md: %s already running, cannot run %s\n",
5791 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5792 mddev_unlock(mddev
);
5794 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5795 mddev
->persistent
= 1;
5796 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5797 list_del_init(&rdev
->same_set
);
5798 if (bind_rdev_to_array(rdev
, mddev
))
5801 autorun_array(mddev
);
5802 mddev_unlock(mddev
);
5804 /* on success, candidates will be empty, on error
5807 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5808 list_del_init(&rdev
->same_set
);
5813 printk(KERN_INFO
"md: ... autorun DONE.\n");
5815 #endif /* !MODULE */
5817 static int get_version(void __user
*arg
)
5821 ver
.major
= MD_MAJOR_VERSION
;
5822 ver
.minor
= MD_MINOR_VERSION
;
5823 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5825 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5831 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5833 mdu_array_info_t info
;
5834 int nr
,working
,insync
,failed
,spare
;
5835 struct md_rdev
*rdev
;
5837 nr
= working
= insync
= failed
= spare
= 0;
5839 rdev_for_each_rcu(rdev
, mddev
) {
5841 if (test_bit(Faulty
, &rdev
->flags
))
5845 if (test_bit(In_sync
, &rdev
->flags
))
5853 info
.major_version
= mddev
->major_version
;
5854 info
.minor_version
= mddev
->minor_version
;
5855 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5856 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
5857 info
.level
= mddev
->level
;
5858 info
.size
= mddev
->dev_sectors
/ 2;
5859 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5862 info
.raid_disks
= mddev
->raid_disks
;
5863 info
.md_minor
= mddev
->md_minor
;
5864 info
.not_persistent
= !mddev
->persistent
;
5866 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
5869 info
.state
= (1<<MD_SB_CLEAN
);
5870 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5871 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5872 if (mddev_is_clustered(mddev
))
5873 info
.state
|= (1<<MD_SB_CLUSTERED
);
5874 info
.active_disks
= insync
;
5875 info
.working_disks
= working
;
5876 info
.failed_disks
= failed
;
5877 info
.spare_disks
= spare
;
5879 info
.layout
= mddev
->layout
;
5880 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5882 if (copy_to_user(arg
, &info
, sizeof(info
)))
5888 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5890 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5894 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5899 spin_lock(&mddev
->lock
);
5900 /* bitmap enabled */
5901 if (mddev
->bitmap_info
.file
) {
5902 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5903 sizeof(file
->pathname
));
5907 memmove(file
->pathname
, ptr
,
5908 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5910 spin_unlock(&mddev
->lock
);
5913 copy_to_user(arg
, file
, sizeof(*file
)))
5920 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5922 mdu_disk_info_t info
;
5923 struct md_rdev
*rdev
;
5925 if (copy_from_user(&info
, arg
, sizeof(info
)))
5929 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5931 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5932 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5933 info
.raid_disk
= rdev
->raid_disk
;
5935 if (test_bit(Faulty
, &rdev
->flags
))
5936 info
.state
|= (1<<MD_DISK_FAULTY
);
5937 else if (test_bit(In_sync
, &rdev
->flags
)) {
5938 info
.state
|= (1<<MD_DISK_ACTIVE
);
5939 info
.state
|= (1<<MD_DISK_SYNC
);
5941 if (test_bit(Journal
, &rdev
->flags
))
5942 info
.state
|= (1<<MD_DISK_JOURNAL
);
5943 if (test_bit(WriteMostly
, &rdev
->flags
))
5944 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5946 info
.major
= info
.minor
= 0;
5947 info
.raid_disk
= -1;
5948 info
.state
= (1<<MD_DISK_REMOVED
);
5952 if (copy_to_user(arg
, &info
, sizeof(info
)))
5958 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5960 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5961 struct md_rdev
*rdev
;
5962 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5964 if (mddev_is_clustered(mddev
) &&
5965 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5966 pr_err("%s: Cannot add to clustered mddev.\n",
5971 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5974 if (!mddev
->raid_disks
) {
5976 /* expecting a device which has a superblock */
5977 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5980 "md: md_import_device returned %ld\n",
5982 return PTR_ERR(rdev
);
5984 if (!list_empty(&mddev
->disks
)) {
5985 struct md_rdev
*rdev0
5986 = list_entry(mddev
->disks
.next
,
5987 struct md_rdev
, same_set
);
5988 err
= super_types
[mddev
->major_version
]
5989 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5992 "md: %s has different UUID to %s\n",
5993 bdevname(rdev
->bdev
,b
),
5994 bdevname(rdev0
->bdev
,b2
));
5999 err
= bind_rdev_to_array(rdev
, mddev
);
6006 * add_new_disk can be used once the array is assembled
6007 * to add "hot spares". They must already have a superblock
6012 if (!mddev
->pers
->hot_add_disk
) {
6014 "%s: personality does not support diskops!\n",
6018 if (mddev
->persistent
)
6019 rdev
= md_import_device(dev
, mddev
->major_version
,
6020 mddev
->minor_version
);
6022 rdev
= md_import_device(dev
, -1, -1);
6025 "md: md_import_device returned %ld\n",
6027 return PTR_ERR(rdev
);
6029 /* set saved_raid_disk if appropriate */
6030 if (!mddev
->persistent
) {
6031 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6032 info
->raid_disk
< mddev
->raid_disks
) {
6033 rdev
->raid_disk
= info
->raid_disk
;
6034 set_bit(In_sync
, &rdev
->flags
);
6035 clear_bit(Bitmap_sync
, &rdev
->flags
);
6037 rdev
->raid_disk
= -1;
6038 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6040 super_types
[mddev
->major_version
].
6041 validate_super(mddev
, rdev
);
6042 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6043 rdev
->raid_disk
!= info
->raid_disk
) {
6044 /* This was a hot-add request, but events doesn't
6045 * match, so reject it.
6051 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6052 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6053 set_bit(WriteMostly
, &rdev
->flags
);
6055 clear_bit(WriteMostly
, &rdev
->flags
);
6057 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6058 struct md_rdev
*rdev2
;
6059 bool has_journal
= false;
6061 /* make sure no existing journal disk */
6062 rdev_for_each(rdev2
, mddev
) {
6063 if (test_bit(Journal
, &rdev2
->flags
)) {
6072 set_bit(Journal
, &rdev
->flags
);
6075 * check whether the device shows up in other nodes
6077 if (mddev_is_clustered(mddev
)) {
6078 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6079 set_bit(Candidate
, &rdev
->flags
);
6080 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6081 /* --add initiated by this node */
6082 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6090 rdev
->raid_disk
= -1;
6091 err
= bind_rdev_to_array(rdev
, mddev
);
6096 if (mddev_is_clustered(mddev
)) {
6097 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6098 md_cluster_ops
->new_disk_ack(mddev
, (err
== 0));
6101 md_cluster_ops
->add_new_disk_cancel(mddev
);
6103 err
= add_bound_rdev(rdev
);
6107 err
= add_bound_rdev(rdev
);
6112 /* otherwise, add_new_disk is only allowed
6113 * for major_version==0 superblocks
6115 if (mddev
->major_version
!= 0) {
6116 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
6121 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6123 rdev
= md_import_device(dev
, -1, 0);
6126 "md: error, md_import_device() returned %ld\n",
6128 return PTR_ERR(rdev
);
6130 rdev
->desc_nr
= info
->number
;
6131 if (info
->raid_disk
< mddev
->raid_disks
)
6132 rdev
->raid_disk
= info
->raid_disk
;
6134 rdev
->raid_disk
= -1;
6136 if (rdev
->raid_disk
< mddev
->raid_disks
)
6137 if (info
->state
& (1<<MD_DISK_SYNC
))
6138 set_bit(In_sync
, &rdev
->flags
);
6140 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6141 set_bit(WriteMostly
, &rdev
->flags
);
6143 if (!mddev
->persistent
) {
6144 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
6145 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6147 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6148 rdev
->sectors
= rdev
->sb_start
;
6150 err
= bind_rdev_to_array(rdev
, mddev
);
6160 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6162 char b
[BDEVNAME_SIZE
];
6163 struct md_rdev
*rdev
;
6165 rdev
= find_rdev(mddev
, dev
);
6169 if (rdev
->raid_disk
< 0)
6172 clear_bit(Blocked
, &rdev
->flags
);
6173 remove_and_add_spares(mddev
, rdev
);
6175 if (rdev
->raid_disk
>= 0)
6179 if (mddev_is_clustered(mddev
))
6180 md_cluster_ops
->remove_disk(mddev
, rdev
);
6182 md_kick_rdev_from_array(rdev
);
6183 md_update_sb(mddev
, 1);
6184 md_new_event(mddev
);
6188 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
6189 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6193 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6195 char b
[BDEVNAME_SIZE
];
6197 struct md_rdev
*rdev
;
6202 if (mddev
->major_version
!= 0) {
6203 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6204 " version-0 superblocks.\n",
6208 if (!mddev
->pers
->hot_add_disk
) {
6210 "%s: personality does not support diskops!\n",
6215 rdev
= md_import_device(dev
, -1, 0);
6218 "md: error, md_import_device() returned %ld\n",
6223 if (mddev
->persistent
)
6224 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6226 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6228 rdev
->sectors
= rdev
->sb_start
;
6230 if (test_bit(Faulty
, &rdev
->flags
)) {
6232 "md: can not hot-add faulty %s disk to %s!\n",
6233 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6238 clear_bit(In_sync
, &rdev
->flags
);
6240 rdev
->saved_raid_disk
= -1;
6241 err
= bind_rdev_to_array(rdev
, mddev
);
6246 * The rest should better be atomic, we can have disk failures
6247 * noticed in interrupt contexts ...
6250 rdev
->raid_disk
= -1;
6252 md_update_sb(mddev
, 1);
6254 * Kick recovery, maybe this spare has to be added to the
6255 * array immediately.
6257 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6258 md_wakeup_thread(mddev
->thread
);
6259 md_new_event(mddev
);
6267 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6272 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6274 if (mddev
->recovery
|| mddev
->sync_thread
)
6276 /* we should be able to change the bitmap.. */
6280 struct inode
*inode
;
6283 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6284 return -EEXIST
; /* cannot add when bitmap is present */
6288 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6293 inode
= f
->f_mapping
->host
;
6294 if (!S_ISREG(inode
->i_mode
)) {
6295 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6298 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6299 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6302 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6303 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6311 mddev
->bitmap_info
.file
= f
;
6312 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6313 } else if (mddev
->bitmap
== NULL
)
6314 return -ENOENT
; /* cannot remove what isn't there */
6317 mddev
->pers
->quiesce(mddev
, 1);
6319 struct bitmap
*bitmap
;
6321 bitmap
= bitmap_create(mddev
, -1);
6322 if (!IS_ERR(bitmap
)) {
6323 mddev
->bitmap
= bitmap
;
6324 err
= bitmap_load(mddev
);
6326 err
= PTR_ERR(bitmap
);
6328 if (fd
< 0 || err
) {
6329 bitmap_destroy(mddev
);
6330 fd
= -1; /* make sure to put the file */
6332 mddev
->pers
->quiesce(mddev
, 0);
6335 struct file
*f
= mddev
->bitmap_info
.file
;
6337 spin_lock(&mddev
->lock
);
6338 mddev
->bitmap_info
.file
= NULL
;
6339 spin_unlock(&mddev
->lock
);
6348 * set_array_info is used two different ways
6349 * The original usage is when creating a new array.
6350 * In this usage, raid_disks is > 0 and it together with
6351 * level, size, not_persistent,layout,chunksize determine the
6352 * shape of the array.
6353 * This will always create an array with a type-0.90.0 superblock.
6354 * The newer usage is when assembling an array.
6355 * In this case raid_disks will be 0, and the major_version field is
6356 * use to determine which style super-blocks are to be found on the devices.
6357 * The minor and patch _version numbers are also kept incase the
6358 * super_block handler wishes to interpret them.
6360 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6363 if (info
->raid_disks
== 0) {
6364 /* just setting version number for superblock loading */
6365 if (info
->major_version
< 0 ||
6366 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6367 super_types
[info
->major_version
].name
== NULL
) {
6368 /* maybe try to auto-load a module? */
6370 "md: superblock version %d not known\n",
6371 info
->major_version
);
6374 mddev
->major_version
= info
->major_version
;
6375 mddev
->minor_version
= info
->minor_version
;
6376 mddev
->patch_version
= info
->patch_version
;
6377 mddev
->persistent
= !info
->not_persistent
;
6378 /* ensure mddev_put doesn't delete this now that there
6379 * is some minimal configuration.
6381 mddev
->ctime
= ktime_get_real_seconds();
6384 mddev
->major_version
= MD_MAJOR_VERSION
;
6385 mddev
->minor_version
= MD_MINOR_VERSION
;
6386 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6387 mddev
->ctime
= ktime_get_real_seconds();
6389 mddev
->level
= info
->level
;
6390 mddev
->clevel
[0] = 0;
6391 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6392 mddev
->raid_disks
= info
->raid_disks
;
6393 /* don't set md_minor, it is determined by which /dev/md* was
6396 if (info
->state
& (1<<MD_SB_CLEAN
))
6397 mddev
->recovery_cp
= MaxSector
;
6399 mddev
->recovery_cp
= 0;
6400 mddev
->persistent
= ! info
->not_persistent
;
6401 mddev
->external
= 0;
6403 mddev
->layout
= info
->layout
;
6404 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6406 mddev
->max_disks
= MD_SB_DISKS
;
6408 if (mddev
->persistent
)
6410 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6412 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6413 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6414 mddev
->bitmap_info
.offset
= 0;
6416 mddev
->reshape_position
= MaxSector
;
6419 * Generate a 128 bit UUID
6421 get_random_bytes(mddev
->uuid
, 16);
6423 mddev
->new_level
= mddev
->level
;
6424 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6425 mddev
->new_layout
= mddev
->layout
;
6426 mddev
->delta_disks
= 0;
6427 mddev
->reshape_backwards
= 0;
6432 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6434 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6436 if (mddev
->external_size
)
6439 mddev
->array_sectors
= array_sectors
;
6441 EXPORT_SYMBOL(md_set_array_sectors
);
6443 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6445 struct md_rdev
*rdev
;
6447 int fit
= (num_sectors
== 0);
6449 /* cluster raid doesn't support update size */
6450 if (mddev_is_clustered(mddev
))
6453 if (mddev
->pers
->resize
== NULL
)
6455 /* The "num_sectors" is the number of sectors of each device that
6456 * is used. This can only make sense for arrays with redundancy.
6457 * linear and raid0 always use whatever space is available. We can only
6458 * consider changing this number if no resync or reconstruction is
6459 * happening, and if the new size is acceptable. It must fit before the
6460 * sb_start or, if that is <data_offset, it must fit before the size
6461 * of each device. If num_sectors is zero, we find the largest size
6464 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6470 rdev_for_each(rdev
, mddev
) {
6471 sector_t avail
= rdev
->sectors
;
6473 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6474 num_sectors
= avail
;
6475 if (avail
< num_sectors
)
6478 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6480 revalidate_disk(mddev
->gendisk
);
6484 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6487 struct md_rdev
*rdev
;
6488 /* change the number of raid disks */
6489 if (mddev
->pers
->check_reshape
== NULL
)
6493 if (raid_disks
<= 0 ||
6494 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6496 if (mddev
->sync_thread
||
6497 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6498 mddev
->reshape_position
!= MaxSector
)
6501 rdev_for_each(rdev
, mddev
) {
6502 if (mddev
->raid_disks
< raid_disks
&&
6503 rdev
->data_offset
< rdev
->new_data_offset
)
6505 if (mddev
->raid_disks
> raid_disks
&&
6506 rdev
->data_offset
> rdev
->new_data_offset
)
6510 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6511 if (mddev
->delta_disks
< 0)
6512 mddev
->reshape_backwards
= 1;
6513 else if (mddev
->delta_disks
> 0)
6514 mddev
->reshape_backwards
= 0;
6516 rv
= mddev
->pers
->check_reshape(mddev
);
6518 mddev
->delta_disks
= 0;
6519 mddev
->reshape_backwards
= 0;
6525 * update_array_info is used to change the configuration of an
6527 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6528 * fields in the info are checked against the array.
6529 * Any differences that cannot be handled will cause an error.
6530 * Normally, only one change can be managed at a time.
6532 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6538 /* calculate expected state,ignoring low bits */
6539 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6540 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6542 if (mddev
->major_version
!= info
->major_version
||
6543 mddev
->minor_version
!= info
->minor_version
||
6544 /* mddev->patch_version != info->patch_version || */
6545 mddev
->ctime
!= info
->ctime
||
6546 mddev
->level
!= info
->level
||
6547 /* mddev->layout != info->layout || */
6548 mddev
->persistent
!= !info
->not_persistent
||
6549 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6550 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6551 ((state
^info
->state
) & 0xfffffe00)
6554 /* Check there is only one change */
6555 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6557 if (mddev
->raid_disks
!= info
->raid_disks
)
6559 if (mddev
->layout
!= info
->layout
)
6561 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6568 if (mddev
->layout
!= info
->layout
) {
6570 * we don't need to do anything at the md level, the
6571 * personality will take care of it all.
6573 if (mddev
->pers
->check_reshape
== NULL
)
6576 mddev
->new_layout
= info
->layout
;
6577 rv
= mddev
->pers
->check_reshape(mddev
);
6579 mddev
->new_layout
= mddev
->layout
;
6583 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6584 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6586 if (mddev
->raid_disks
!= info
->raid_disks
)
6587 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6589 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6590 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6594 if (mddev
->recovery
|| mddev
->sync_thread
) {
6598 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6599 struct bitmap
*bitmap
;
6600 /* add the bitmap */
6601 if (mddev
->bitmap
) {
6605 if (mddev
->bitmap_info
.default_offset
== 0) {
6609 mddev
->bitmap_info
.offset
=
6610 mddev
->bitmap_info
.default_offset
;
6611 mddev
->bitmap_info
.space
=
6612 mddev
->bitmap_info
.default_space
;
6613 mddev
->pers
->quiesce(mddev
, 1);
6614 bitmap
= bitmap_create(mddev
, -1);
6615 if (!IS_ERR(bitmap
)) {
6616 mddev
->bitmap
= bitmap
;
6617 rv
= bitmap_load(mddev
);
6619 rv
= PTR_ERR(bitmap
);
6621 bitmap_destroy(mddev
);
6622 mddev
->pers
->quiesce(mddev
, 0);
6624 /* remove the bitmap */
6625 if (!mddev
->bitmap
) {
6629 if (mddev
->bitmap
->storage
.file
) {
6633 if (mddev
->bitmap_info
.nodes
) {
6634 /* hold PW on all the bitmap lock */
6635 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6636 printk("md: can't change bitmap to none since the"
6637 " array is in use by more than one node\n");
6639 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6643 mddev
->bitmap_info
.nodes
= 0;
6644 md_cluster_ops
->leave(mddev
);
6646 mddev
->pers
->quiesce(mddev
, 1);
6647 bitmap_destroy(mddev
);
6648 mddev
->pers
->quiesce(mddev
, 0);
6649 mddev
->bitmap_info
.offset
= 0;
6652 md_update_sb(mddev
, 1);
6658 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6660 struct md_rdev
*rdev
;
6663 if (mddev
->pers
== NULL
)
6667 rdev
= find_rdev_rcu(mddev
, dev
);
6671 md_error(mddev
, rdev
);
6672 if (!test_bit(Faulty
, &rdev
->flags
))
6680 * We have a problem here : there is no easy way to give a CHS
6681 * virtual geometry. We currently pretend that we have a 2 heads
6682 * 4 sectors (with a BIG number of cylinders...). This drives
6683 * dosfs just mad... ;-)
6685 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6687 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6691 geo
->cylinders
= mddev
->array_sectors
/ 8;
6695 static inline bool md_ioctl_valid(unsigned int cmd
)
6700 case GET_ARRAY_INFO
:
6701 case GET_BITMAP_FILE
:
6704 case HOT_REMOVE_DISK
:
6707 case RESTART_ARRAY_RW
:
6709 case SET_ARRAY_INFO
:
6710 case SET_BITMAP_FILE
:
6711 case SET_DISK_FAULTY
:
6714 case CLUSTERED_DISK_NACK
:
6721 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6722 unsigned int cmd
, unsigned long arg
)
6725 void __user
*argp
= (void __user
*)arg
;
6726 struct mddev
*mddev
= NULL
;
6729 if (!md_ioctl_valid(cmd
))
6734 case GET_ARRAY_INFO
:
6738 if (!capable(CAP_SYS_ADMIN
))
6743 * Commands dealing with the RAID driver but not any
6748 err
= get_version(argp
);
6754 autostart_arrays(arg
);
6761 * Commands creating/starting a new array:
6764 mddev
= bdev
->bd_disk
->private_data
;
6771 /* Some actions do not requires the mutex */
6773 case GET_ARRAY_INFO
:
6774 if (!mddev
->raid_disks
&& !mddev
->external
)
6777 err
= get_array_info(mddev
, argp
);
6781 if (!mddev
->raid_disks
&& !mddev
->external
)
6784 err
= get_disk_info(mddev
, argp
);
6787 case SET_DISK_FAULTY
:
6788 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6791 case GET_BITMAP_FILE
:
6792 err
= get_bitmap_file(mddev
, argp
);
6797 if (cmd
== ADD_NEW_DISK
)
6798 /* need to ensure md_delayed_delete() has completed */
6799 flush_workqueue(md_misc_wq
);
6801 if (cmd
== HOT_REMOVE_DISK
)
6802 /* need to ensure recovery thread has run */
6803 wait_event_interruptible_timeout(mddev
->sb_wait
,
6804 !test_bit(MD_RECOVERY_NEEDED
,
6806 msecs_to_jiffies(5000));
6807 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6808 /* Need to flush page cache, and ensure no-one else opens
6811 mutex_lock(&mddev
->open_mutex
);
6812 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6813 mutex_unlock(&mddev
->open_mutex
);
6817 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6818 mutex_unlock(&mddev
->open_mutex
);
6819 sync_blockdev(bdev
);
6821 err
= mddev_lock(mddev
);
6824 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6829 if (cmd
== SET_ARRAY_INFO
) {
6830 mdu_array_info_t info
;
6832 memset(&info
, 0, sizeof(info
));
6833 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6838 err
= update_array_info(mddev
, &info
);
6840 printk(KERN_WARNING
"md: couldn't update"
6841 " array info. %d\n", err
);
6846 if (!list_empty(&mddev
->disks
)) {
6848 "md: array %s already has disks!\n",
6853 if (mddev
->raid_disks
) {
6855 "md: array %s already initialised!\n",
6860 err
= set_array_info(mddev
, &info
);
6862 printk(KERN_WARNING
"md: couldn't set"
6863 " array info. %d\n", err
);
6870 * Commands querying/configuring an existing array:
6872 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6873 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6874 if ((!mddev
->raid_disks
&& !mddev
->external
)
6875 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6876 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6877 && cmd
!= GET_BITMAP_FILE
) {
6883 * Commands even a read-only array can execute:
6886 case RESTART_ARRAY_RW
:
6887 err
= restart_array(mddev
);
6891 err
= do_md_stop(mddev
, 0, bdev
);
6895 err
= md_set_readonly(mddev
, bdev
);
6898 case HOT_REMOVE_DISK
:
6899 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6903 /* We can support ADD_NEW_DISK on read-only arrays
6904 * only if we are re-adding a preexisting device.
6905 * So require mddev->pers and MD_DISK_SYNC.
6908 mdu_disk_info_t info
;
6909 if (copy_from_user(&info
, argp
, sizeof(info
)))
6911 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6912 /* Need to clear read-only for this */
6915 err
= add_new_disk(mddev
, &info
);
6921 if (get_user(ro
, (int __user
*)(arg
))) {
6927 /* if the bdev is going readonly the value of mddev->ro
6928 * does not matter, no writes are coming
6933 /* are we are already prepared for writes? */
6937 /* transitioning to readauto need only happen for
6938 * arrays that call md_write_start
6941 err
= restart_array(mddev
);
6944 set_disk_ro(mddev
->gendisk
, 0);
6951 * The remaining ioctls are changing the state of the
6952 * superblock, so we do not allow them on read-only arrays.
6954 if (mddev
->ro
&& mddev
->pers
) {
6955 if (mddev
->ro
== 2) {
6957 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6958 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6959 /* mddev_unlock will wake thread */
6960 /* If a device failed while we were read-only, we
6961 * need to make sure the metadata is updated now.
6963 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6964 mddev_unlock(mddev
);
6965 wait_event(mddev
->sb_wait
,
6966 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6967 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6968 mddev_lock_nointr(mddev
);
6979 mdu_disk_info_t info
;
6980 if (copy_from_user(&info
, argp
, sizeof(info
)))
6983 err
= add_new_disk(mddev
, &info
);
6987 case CLUSTERED_DISK_NACK
:
6988 if (mddev_is_clustered(mddev
))
6989 md_cluster_ops
->new_disk_ack(mddev
, false);
6995 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6999 err
= do_md_run(mddev
);
7002 case SET_BITMAP_FILE
:
7003 err
= set_bitmap_file(mddev
, (int)arg
);
7012 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7014 mddev
->hold_active
= 0;
7015 mddev_unlock(mddev
);
7019 #ifdef CONFIG_COMPAT
7020 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7021 unsigned int cmd
, unsigned long arg
)
7024 case HOT_REMOVE_DISK
:
7026 case SET_DISK_FAULTY
:
7027 case SET_BITMAP_FILE
:
7028 /* These take in integer arg, do not convert */
7031 arg
= (unsigned long)compat_ptr(arg
);
7035 return md_ioctl(bdev
, mode
, cmd
, arg
);
7037 #endif /* CONFIG_COMPAT */
7039 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7042 * Succeed if we can lock the mddev, which confirms that
7043 * it isn't being stopped right now.
7045 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7051 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7052 /* we are racing with mddev_put which is discarding this
7056 /* Wait until bdev->bd_disk is definitely gone */
7057 flush_workqueue(md_misc_wq
);
7058 /* Then retry the open from the top */
7059 return -ERESTARTSYS
;
7061 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7063 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7067 atomic_inc(&mddev
->openers
);
7068 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
7069 mutex_unlock(&mddev
->open_mutex
);
7071 check_disk_change(bdev
);
7076 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7078 struct mddev
*mddev
= disk
->private_data
;
7081 atomic_dec(&mddev
->openers
);
7085 static int md_media_changed(struct gendisk
*disk
)
7087 struct mddev
*mddev
= disk
->private_data
;
7089 return mddev
->changed
;
7092 static int md_revalidate(struct gendisk
*disk
)
7094 struct mddev
*mddev
= disk
->private_data
;
7099 static const struct block_device_operations md_fops
=
7101 .owner
= THIS_MODULE
,
7103 .release
= md_release
,
7105 #ifdef CONFIG_COMPAT
7106 .compat_ioctl
= md_compat_ioctl
,
7108 .getgeo
= md_getgeo
,
7109 .media_changed
= md_media_changed
,
7110 .revalidate_disk
= md_revalidate
,
7113 static int md_thread(void *arg
)
7115 struct md_thread
*thread
= arg
;
7118 * md_thread is a 'system-thread', it's priority should be very
7119 * high. We avoid resource deadlocks individually in each
7120 * raid personality. (RAID5 does preallocation) We also use RR and
7121 * the very same RT priority as kswapd, thus we will never get
7122 * into a priority inversion deadlock.
7124 * we definitely have to have equal or higher priority than
7125 * bdflush, otherwise bdflush will deadlock if there are too
7126 * many dirty RAID5 blocks.
7129 allow_signal(SIGKILL
);
7130 while (!kthread_should_stop()) {
7132 /* We need to wait INTERRUPTIBLE so that
7133 * we don't add to the load-average.
7134 * That means we need to be sure no signals are
7137 if (signal_pending(current
))
7138 flush_signals(current
);
7140 wait_event_interruptible_timeout
7142 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7143 || kthread_should_stop(),
7146 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7147 if (!kthread_should_stop())
7148 thread
->run(thread
);
7154 void md_wakeup_thread(struct md_thread
*thread
)
7157 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7158 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7159 wake_up(&thread
->wqueue
);
7162 EXPORT_SYMBOL(md_wakeup_thread
);
7164 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7165 struct mddev
*mddev
, const char *name
)
7167 struct md_thread
*thread
;
7169 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7173 init_waitqueue_head(&thread
->wqueue
);
7176 thread
->mddev
= mddev
;
7177 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7178 thread
->tsk
= kthread_run(md_thread
, thread
,
7180 mdname(thread
->mddev
),
7182 if (IS_ERR(thread
->tsk
)) {
7188 EXPORT_SYMBOL(md_register_thread
);
7190 void md_unregister_thread(struct md_thread
**threadp
)
7192 struct md_thread
*thread
= *threadp
;
7195 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7196 /* Locking ensures that mddev_unlock does not wake_up a
7197 * non-existent thread
7199 spin_lock(&pers_lock
);
7201 spin_unlock(&pers_lock
);
7203 kthread_stop(thread
->tsk
);
7206 EXPORT_SYMBOL(md_unregister_thread
);
7208 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7210 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7213 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7215 mddev
->pers
->error_handler(mddev
,rdev
);
7216 if (mddev
->degraded
)
7217 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7218 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7219 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7220 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7221 md_wakeup_thread(mddev
->thread
);
7222 if (mddev
->event_work
.func
)
7223 queue_work(md_misc_wq
, &mddev
->event_work
);
7224 md_new_event(mddev
);
7226 EXPORT_SYMBOL(md_error
);
7228 /* seq_file implementation /proc/mdstat */
7230 static void status_unused(struct seq_file
*seq
)
7233 struct md_rdev
*rdev
;
7235 seq_printf(seq
, "unused devices: ");
7237 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7238 char b
[BDEVNAME_SIZE
];
7240 seq_printf(seq
, "%s ",
7241 bdevname(rdev
->bdev
,b
));
7244 seq_printf(seq
, "<none>");
7246 seq_printf(seq
, "\n");
7249 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7251 sector_t max_sectors
, resync
, res
;
7252 unsigned long dt
, db
;
7255 unsigned int per_milli
;
7257 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7258 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7259 max_sectors
= mddev
->resync_max_sectors
;
7261 max_sectors
= mddev
->dev_sectors
;
7263 resync
= mddev
->curr_resync
;
7265 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7266 /* Still cleaning up */
7267 resync
= max_sectors
;
7269 resync
-= atomic_read(&mddev
->recovery_active
);
7272 if (mddev
->recovery_cp
< MaxSector
) {
7273 seq_printf(seq
, "\tresync=PENDING");
7279 seq_printf(seq
, "\tresync=DELAYED");
7283 WARN_ON(max_sectors
== 0);
7284 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7285 * in a sector_t, and (max_sectors>>scale) will fit in a
7286 * u32, as those are the requirements for sector_div.
7287 * Thus 'scale' must be at least 10
7290 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7291 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7294 res
= (resync
>>scale
)*1000;
7295 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7299 int i
, x
= per_milli
/50, y
= 20-x
;
7300 seq_printf(seq
, "[");
7301 for (i
= 0; i
< x
; i
++)
7302 seq_printf(seq
, "=");
7303 seq_printf(seq
, ">");
7304 for (i
= 0; i
< y
; i
++)
7305 seq_printf(seq
, ".");
7306 seq_printf(seq
, "] ");
7308 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7309 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7311 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7313 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7314 "resync" : "recovery"))),
7315 per_milli
/10, per_milli
% 10,
7316 (unsigned long long) resync
/2,
7317 (unsigned long long) max_sectors
/2);
7320 * dt: time from mark until now
7321 * db: blocks written from mark until now
7322 * rt: remaining time
7324 * rt is a sector_t, so could be 32bit or 64bit.
7325 * So we divide before multiply in case it is 32bit and close
7327 * We scale the divisor (db) by 32 to avoid losing precision
7328 * near the end of resync when the number of remaining sectors
7330 * We then divide rt by 32 after multiplying by db to compensate.
7331 * The '+1' avoids division by zero if db is very small.
7333 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7335 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7336 - mddev
->resync_mark_cnt
;
7338 rt
= max_sectors
- resync
; /* number of remaining sectors */
7339 sector_div(rt
, db
/32+1);
7343 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7344 ((unsigned long)rt
% 60)/6);
7346 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7350 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7352 struct list_head
*tmp
;
7354 struct mddev
*mddev
;
7362 spin_lock(&all_mddevs_lock
);
7363 list_for_each(tmp
,&all_mddevs
)
7365 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7367 spin_unlock(&all_mddevs_lock
);
7370 spin_unlock(&all_mddevs_lock
);
7372 return (void*)2;/* tail */
7376 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7378 struct list_head
*tmp
;
7379 struct mddev
*next_mddev
, *mddev
= v
;
7385 spin_lock(&all_mddevs_lock
);
7387 tmp
= all_mddevs
.next
;
7389 tmp
= mddev
->all_mddevs
.next
;
7390 if (tmp
!= &all_mddevs
)
7391 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7393 next_mddev
= (void*)2;
7396 spin_unlock(&all_mddevs_lock
);
7404 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7406 struct mddev
*mddev
= v
;
7408 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7412 static int md_seq_show(struct seq_file
*seq
, void *v
)
7414 struct mddev
*mddev
= v
;
7416 struct md_rdev
*rdev
;
7418 if (v
== (void*)1) {
7419 struct md_personality
*pers
;
7420 seq_printf(seq
, "Personalities : ");
7421 spin_lock(&pers_lock
);
7422 list_for_each_entry(pers
, &pers_list
, list
)
7423 seq_printf(seq
, "[%s] ", pers
->name
);
7425 spin_unlock(&pers_lock
);
7426 seq_printf(seq
, "\n");
7427 seq
->poll_event
= atomic_read(&md_event_count
);
7430 if (v
== (void*)2) {
7435 spin_lock(&mddev
->lock
);
7436 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7437 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7438 mddev
->pers
? "" : "in");
7441 seq_printf(seq
, " (read-only)");
7443 seq_printf(seq
, " (auto-read-only)");
7444 seq_printf(seq
, " %s", mddev
->pers
->name
);
7449 rdev_for_each_rcu(rdev
, mddev
) {
7450 char b
[BDEVNAME_SIZE
];
7451 seq_printf(seq
, " %s[%d]",
7452 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7453 if (test_bit(WriteMostly
, &rdev
->flags
))
7454 seq_printf(seq
, "(W)");
7455 if (test_bit(Journal
, &rdev
->flags
))
7456 seq_printf(seq
, "(J)");
7457 if (test_bit(Faulty
, &rdev
->flags
)) {
7458 seq_printf(seq
, "(F)");
7461 if (rdev
->raid_disk
< 0)
7462 seq_printf(seq
, "(S)"); /* spare */
7463 if (test_bit(Replacement
, &rdev
->flags
))
7464 seq_printf(seq
, "(R)");
7465 sectors
+= rdev
->sectors
;
7469 if (!list_empty(&mddev
->disks
)) {
7471 seq_printf(seq
, "\n %llu blocks",
7472 (unsigned long long)
7473 mddev
->array_sectors
/ 2);
7475 seq_printf(seq
, "\n %llu blocks",
7476 (unsigned long long)sectors
/ 2);
7478 if (mddev
->persistent
) {
7479 if (mddev
->major_version
!= 0 ||
7480 mddev
->minor_version
!= 90) {
7481 seq_printf(seq
," super %d.%d",
7482 mddev
->major_version
,
7483 mddev
->minor_version
);
7485 } else if (mddev
->external
)
7486 seq_printf(seq
, " super external:%s",
7487 mddev
->metadata_type
);
7489 seq_printf(seq
, " super non-persistent");
7492 mddev
->pers
->status(seq
, mddev
);
7493 seq_printf(seq
, "\n ");
7494 if (mddev
->pers
->sync_request
) {
7495 if (status_resync(seq
, mddev
))
7496 seq_printf(seq
, "\n ");
7499 seq_printf(seq
, "\n ");
7501 bitmap_status(seq
, mddev
->bitmap
);
7503 seq_printf(seq
, "\n");
7505 spin_unlock(&mddev
->lock
);
7510 static const struct seq_operations md_seq_ops
= {
7511 .start
= md_seq_start
,
7512 .next
= md_seq_next
,
7513 .stop
= md_seq_stop
,
7514 .show
= md_seq_show
,
7517 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7519 struct seq_file
*seq
;
7522 error
= seq_open(file
, &md_seq_ops
);
7526 seq
= file
->private_data
;
7527 seq
->poll_event
= atomic_read(&md_event_count
);
7531 static int md_unloading
;
7532 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7534 struct seq_file
*seq
= filp
->private_data
;
7538 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7539 poll_wait(filp
, &md_event_waiters
, wait
);
7541 /* always allow read */
7542 mask
= POLLIN
| POLLRDNORM
;
7544 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7545 mask
|= POLLERR
| POLLPRI
;
7549 static const struct file_operations md_seq_fops
= {
7550 .owner
= THIS_MODULE
,
7551 .open
= md_seq_open
,
7553 .llseek
= seq_lseek
,
7554 .release
= seq_release_private
,
7555 .poll
= mdstat_poll
,
7558 int register_md_personality(struct md_personality
*p
)
7560 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7562 spin_lock(&pers_lock
);
7563 list_add_tail(&p
->list
, &pers_list
);
7564 spin_unlock(&pers_lock
);
7567 EXPORT_SYMBOL(register_md_personality
);
7569 int unregister_md_personality(struct md_personality
*p
)
7571 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7572 spin_lock(&pers_lock
);
7573 list_del_init(&p
->list
);
7574 spin_unlock(&pers_lock
);
7577 EXPORT_SYMBOL(unregister_md_personality
);
7579 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7580 struct module
*module
)
7583 spin_lock(&pers_lock
);
7584 if (md_cluster_ops
!= NULL
)
7587 md_cluster_ops
= ops
;
7588 md_cluster_mod
= module
;
7590 spin_unlock(&pers_lock
);
7593 EXPORT_SYMBOL(register_md_cluster_operations
);
7595 int unregister_md_cluster_operations(void)
7597 spin_lock(&pers_lock
);
7598 md_cluster_ops
= NULL
;
7599 spin_unlock(&pers_lock
);
7602 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7604 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7608 err
= request_module("md-cluster");
7610 pr_err("md-cluster module not found.\n");
7614 spin_lock(&pers_lock
);
7615 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7616 spin_unlock(&pers_lock
);
7619 spin_unlock(&pers_lock
);
7621 return md_cluster_ops
->join(mddev
, nodes
);
7624 void md_cluster_stop(struct mddev
*mddev
)
7626 if (!md_cluster_ops
)
7628 md_cluster_ops
->leave(mddev
);
7629 module_put(md_cluster_mod
);
7632 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7634 struct md_rdev
*rdev
;
7640 rdev_for_each_rcu(rdev
, mddev
) {
7641 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7642 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7643 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7644 atomic_read(&disk
->sync_io
);
7645 /* sync IO will cause sync_io to increase before the disk_stats
7646 * as sync_io is counted when a request starts, and
7647 * disk_stats is counted when it completes.
7648 * So resync activity will cause curr_events to be smaller than
7649 * when there was no such activity.
7650 * non-sync IO will cause disk_stat to increase without
7651 * increasing sync_io so curr_events will (eventually)
7652 * be larger than it was before. Once it becomes
7653 * substantially larger, the test below will cause
7654 * the array to appear non-idle, and resync will slow
7656 * If there is a lot of outstanding resync activity when
7657 * we set last_event to curr_events, then all that activity
7658 * completing might cause the array to appear non-idle
7659 * and resync will be slowed down even though there might
7660 * not have been non-resync activity. This will only
7661 * happen once though. 'last_events' will soon reflect
7662 * the state where there is little or no outstanding
7663 * resync requests, and further resync activity will
7664 * always make curr_events less than last_events.
7667 if (init
|| curr_events
- rdev
->last_events
> 64) {
7668 rdev
->last_events
= curr_events
;
7676 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7678 /* another "blocks" (512byte) blocks have been synced */
7679 atomic_sub(blocks
, &mddev
->recovery_active
);
7680 wake_up(&mddev
->recovery_wait
);
7682 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7683 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7684 md_wakeup_thread(mddev
->thread
);
7685 // stop recovery, signal do_sync ....
7688 EXPORT_SYMBOL(md_done_sync
);
7690 /* md_write_start(mddev, bi)
7691 * If we need to update some array metadata (e.g. 'active' flag
7692 * in superblock) before writing, schedule a superblock update
7693 * and wait for it to complete.
7695 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7698 if (bio_data_dir(bi
) != WRITE
)
7701 BUG_ON(mddev
->ro
== 1);
7702 if (mddev
->ro
== 2) {
7703 /* need to switch to read/write */
7705 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7706 md_wakeup_thread(mddev
->thread
);
7707 md_wakeup_thread(mddev
->sync_thread
);
7710 atomic_inc(&mddev
->writes_pending
);
7711 if (mddev
->safemode
== 1)
7712 mddev
->safemode
= 0;
7713 if (mddev
->in_sync
) {
7714 spin_lock(&mddev
->lock
);
7715 if (mddev
->in_sync
) {
7717 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7718 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7719 md_wakeup_thread(mddev
->thread
);
7722 spin_unlock(&mddev
->lock
);
7725 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7726 wait_event(mddev
->sb_wait
,
7727 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7729 EXPORT_SYMBOL(md_write_start
);
7731 void md_write_end(struct mddev
*mddev
)
7733 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7734 if (mddev
->safemode
== 2)
7735 md_wakeup_thread(mddev
->thread
);
7736 else if (mddev
->safemode_delay
)
7737 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7740 EXPORT_SYMBOL(md_write_end
);
7742 /* md_allow_write(mddev)
7743 * Calling this ensures that the array is marked 'active' so that writes
7744 * may proceed without blocking. It is important to call this before
7745 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7746 * Must be called with mddev_lock held.
7748 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7749 * is dropped, so return -EAGAIN after notifying userspace.
7751 int md_allow_write(struct mddev
*mddev
)
7757 if (!mddev
->pers
->sync_request
)
7760 spin_lock(&mddev
->lock
);
7761 if (mddev
->in_sync
) {
7763 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7764 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7765 if (mddev
->safemode_delay
&&
7766 mddev
->safemode
== 0)
7767 mddev
->safemode
= 1;
7768 spin_unlock(&mddev
->lock
);
7769 md_update_sb(mddev
, 0);
7770 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7772 spin_unlock(&mddev
->lock
);
7774 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7779 EXPORT_SYMBOL_GPL(md_allow_write
);
7781 #define SYNC_MARKS 10
7782 #define SYNC_MARK_STEP (3*HZ)
7783 #define UPDATE_FREQUENCY (5*60*HZ)
7784 void md_do_sync(struct md_thread
*thread
)
7786 struct mddev
*mddev
= thread
->mddev
;
7787 struct mddev
*mddev2
;
7788 unsigned int currspeed
= 0,
7790 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7791 unsigned long mark
[SYNC_MARKS
];
7792 unsigned long update_time
;
7793 sector_t mark_cnt
[SYNC_MARKS
];
7795 struct list_head
*tmp
;
7796 sector_t last_check
;
7798 struct md_rdev
*rdev
;
7799 char *desc
, *action
= NULL
;
7800 struct blk_plug plug
;
7803 /* just incase thread restarts... */
7804 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7806 if (mddev
->ro
) {/* never try to sync a read-only array */
7807 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7811 if (mddev_is_clustered(mddev
)) {
7812 ret
= md_cluster_ops
->resync_start(mddev
);
7816 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7817 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
7818 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
7819 && ((unsigned long long)mddev
->curr_resync_completed
7820 < (unsigned long long)mddev
->resync_max_sectors
))
7824 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7825 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7826 desc
= "data-check";
7828 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7829 desc
= "requested-resync";
7833 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7838 mddev
->last_sync_action
= action
?: desc
;
7840 /* we overload curr_resync somewhat here.
7841 * 0 == not engaged in resync at all
7842 * 2 == checking that there is no conflict with another sync
7843 * 1 == like 2, but have yielded to allow conflicting resync to
7845 * other == active in resync - this many blocks
7847 * Before starting a resync we must have set curr_resync to
7848 * 2, and then checked that every "conflicting" array has curr_resync
7849 * less than ours. When we find one that is the same or higher
7850 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7851 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7852 * This will mean we have to start checking from the beginning again.
7857 mddev
->curr_resync
= 2;
7860 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7862 for_each_mddev(mddev2
, tmp
) {
7863 if (mddev2
== mddev
)
7865 if (!mddev
->parallel_resync
7866 && mddev2
->curr_resync
7867 && match_mddev_units(mddev
, mddev2
)) {
7869 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7870 /* arbitrarily yield */
7871 mddev
->curr_resync
= 1;
7872 wake_up(&resync_wait
);
7874 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7875 /* no need to wait here, we can wait the next
7876 * time 'round when curr_resync == 2
7879 /* We need to wait 'interruptible' so as not to
7880 * contribute to the load average, and not to
7881 * be caught by 'softlockup'
7883 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7884 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7885 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7886 printk(KERN_INFO
"md: delaying %s of %s"
7887 " until %s has finished (they"
7888 " share one or more physical units)\n",
7889 desc
, mdname(mddev
), mdname(mddev2
));
7891 if (signal_pending(current
))
7892 flush_signals(current
);
7894 finish_wait(&resync_wait
, &wq
);
7897 finish_wait(&resync_wait
, &wq
);
7900 } while (mddev
->curr_resync
< 2);
7903 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7904 /* resync follows the size requested by the personality,
7905 * which defaults to physical size, but can be virtual size
7907 max_sectors
= mddev
->resync_max_sectors
;
7908 atomic64_set(&mddev
->resync_mismatches
, 0);
7909 /* we don't use the checkpoint if there's a bitmap */
7910 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7911 j
= mddev
->resync_min
;
7912 else if (!mddev
->bitmap
)
7913 j
= mddev
->recovery_cp
;
7915 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7916 max_sectors
= mddev
->resync_max_sectors
;
7918 /* recovery follows the physical size of devices */
7919 max_sectors
= mddev
->dev_sectors
;
7922 rdev_for_each_rcu(rdev
, mddev
)
7923 if (rdev
->raid_disk
>= 0 &&
7924 !test_bit(Journal
, &rdev
->flags
) &&
7925 !test_bit(Faulty
, &rdev
->flags
) &&
7926 !test_bit(In_sync
, &rdev
->flags
) &&
7927 rdev
->recovery_offset
< j
)
7928 j
= rdev
->recovery_offset
;
7931 /* If there is a bitmap, we need to make sure all
7932 * writes that started before we added a spare
7933 * complete before we start doing a recovery.
7934 * Otherwise the write might complete and (via
7935 * bitmap_endwrite) set a bit in the bitmap after the
7936 * recovery has checked that bit and skipped that
7939 if (mddev
->bitmap
) {
7940 mddev
->pers
->quiesce(mddev
, 1);
7941 mddev
->pers
->quiesce(mddev
, 0);
7945 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7946 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7947 " %d KB/sec/disk.\n", speed_min(mddev
));
7948 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7949 "(but not more than %d KB/sec) for %s.\n",
7950 speed_max(mddev
), desc
);
7952 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7955 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7957 mark_cnt
[m
] = io_sectors
;
7960 mddev
->resync_mark
= mark
[last_mark
];
7961 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7964 * Tune reconstruction:
7966 window
= 32*(PAGE_SIZE
/512);
7967 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7968 window
/2, (unsigned long long)max_sectors
/2);
7970 atomic_set(&mddev
->recovery_active
, 0);
7975 "md: resuming %s of %s from checkpoint.\n",
7976 desc
, mdname(mddev
));
7977 mddev
->curr_resync
= j
;
7979 mddev
->curr_resync
= 3; /* no longer delayed */
7980 mddev
->curr_resync_completed
= j
;
7981 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7982 md_new_event(mddev
);
7983 update_time
= jiffies
;
7985 blk_start_plug(&plug
);
7986 while (j
< max_sectors
) {
7991 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7992 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7993 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7994 > (max_sectors
>> 4)) ||
7995 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7996 (j
- mddev
->curr_resync_completed
)*2
7997 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
7998 mddev
->curr_resync_completed
> mddev
->resync_max
8000 /* time to update curr_resync_completed */
8001 wait_event(mddev
->recovery_wait
,
8002 atomic_read(&mddev
->recovery_active
) == 0);
8003 mddev
->curr_resync_completed
= j
;
8004 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8005 j
> mddev
->recovery_cp
)
8006 mddev
->recovery_cp
= j
;
8007 update_time
= jiffies
;
8008 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8009 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8012 while (j
>= mddev
->resync_max
&&
8013 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8014 /* As this condition is controlled by user-space,
8015 * we can block indefinitely, so use '_interruptible'
8016 * to avoid triggering warnings.
8018 flush_signals(current
); /* just in case */
8019 wait_event_interruptible(mddev
->recovery_wait
,
8020 mddev
->resync_max
> j
8021 || test_bit(MD_RECOVERY_INTR
,
8025 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8028 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8030 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8034 if (!skipped
) { /* actual IO requested */
8035 io_sectors
+= sectors
;
8036 atomic_add(sectors
, &mddev
->recovery_active
);
8039 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8043 if (j
> max_sectors
)
8044 /* when skipping, extra large numbers can be returned. */
8047 mddev
->curr_resync
= j
;
8048 mddev
->curr_mark_cnt
= io_sectors
;
8049 if (last_check
== 0)
8050 /* this is the earliest that rebuild will be
8051 * visible in /proc/mdstat
8053 md_new_event(mddev
);
8055 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8058 last_check
= io_sectors
;
8060 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8062 int next
= (last_mark
+1) % SYNC_MARKS
;
8064 mddev
->resync_mark
= mark
[next
];
8065 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8066 mark
[next
] = jiffies
;
8067 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8071 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8075 * this loop exits only if either when we are slower than
8076 * the 'hard' speed limit, or the system was IO-idle for
8078 * the system might be non-idle CPU-wise, but we only care
8079 * about not overloading the IO subsystem. (things like an
8080 * e2fsck being done on the RAID array should execute fast)
8084 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8085 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8086 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8088 if (currspeed
> speed_min(mddev
)) {
8089 if (currspeed
> speed_max(mddev
)) {
8093 if (!is_mddev_idle(mddev
, 0)) {
8095 * Give other IO more of a chance.
8096 * The faster the devices, the less we wait.
8098 wait_event(mddev
->recovery_wait
,
8099 !atomic_read(&mddev
->recovery_active
));
8103 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
8104 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8105 ? "interrupted" : "done");
8107 * this also signals 'finished resyncing' to md_stop
8109 blk_finish_plug(&plug
);
8110 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8112 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8113 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8114 mddev
->curr_resync
> 2) {
8115 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8116 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8118 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8120 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8121 mddev
->curr_resync
> 2) {
8122 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8123 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8124 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8126 "md: checkpointing %s of %s.\n",
8127 desc
, mdname(mddev
));
8128 if (test_bit(MD_RECOVERY_ERROR
,
8130 mddev
->recovery_cp
=
8131 mddev
->curr_resync_completed
;
8133 mddev
->recovery_cp
=
8137 mddev
->recovery_cp
= MaxSector
;
8139 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8140 mddev
->curr_resync
= MaxSector
;
8142 rdev_for_each_rcu(rdev
, mddev
)
8143 if (rdev
->raid_disk
>= 0 &&
8144 mddev
->delta_disks
>= 0 &&
8145 !test_bit(Journal
, &rdev
->flags
) &&
8146 !test_bit(Faulty
, &rdev
->flags
) &&
8147 !test_bit(In_sync
, &rdev
->flags
) &&
8148 rdev
->recovery_offset
< mddev
->curr_resync
)
8149 rdev
->recovery_offset
= mddev
->curr_resync
;
8154 if (mddev_is_clustered(mddev
) &&
8156 /* set CHANGE_PENDING here since maybe another
8157 * update is needed, so other nodes are informed */
8158 set_mask_bits(&mddev
->flags
, 0,
8159 BIT(MD_CHANGE_PENDING
) | BIT(MD_CHANGE_DEVS
));
8160 md_wakeup_thread(mddev
->thread
);
8161 wait_event(mddev
->sb_wait
,
8162 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
8163 md_cluster_ops
->resync_finish(mddev
);
8165 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8167 spin_lock(&mddev
->lock
);
8168 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8169 /* We completed so min/max setting can be forgotten if used. */
8170 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8171 mddev
->resync_min
= 0;
8172 mddev
->resync_max
= MaxSector
;
8173 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8174 mddev
->resync_min
= mddev
->curr_resync_completed
;
8175 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8176 mddev
->curr_resync
= 0;
8177 spin_unlock(&mddev
->lock
);
8179 wake_up(&resync_wait
);
8180 md_wakeup_thread(mddev
->thread
);
8183 EXPORT_SYMBOL_GPL(md_do_sync
);
8185 static int remove_and_add_spares(struct mddev
*mddev
,
8186 struct md_rdev
*this)
8188 struct md_rdev
*rdev
;
8192 rdev_for_each(rdev
, mddev
)
8193 if ((this == NULL
|| rdev
== this) &&
8194 rdev
->raid_disk
>= 0 &&
8195 !test_bit(Blocked
, &rdev
->flags
) &&
8196 (test_bit(Faulty
, &rdev
->flags
) ||
8197 (!test_bit(In_sync
, &rdev
->flags
) &&
8198 !test_bit(Journal
, &rdev
->flags
))) &&
8199 atomic_read(&rdev
->nr_pending
)==0) {
8200 if (mddev
->pers
->hot_remove_disk(
8201 mddev
, rdev
) == 0) {
8202 sysfs_unlink_rdev(mddev
, rdev
);
8203 rdev
->raid_disk
= -1;
8207 if (removed
&& mddev
->kobj
.sd
)
8208 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8210 if (this && removed
)
8213 rdev_for_each(rdev
, mddev
) {
8214 if (this && this != rdev
)
8216 if (test_bit(Candidate
, &rdev
->flags
))
8218 if (rdev
->raid_disk
>= 0 &&
8219 !test_bit(In_sync
, &rdev
->flags
) &&
8220 !test_bit(Journal
, &rdev
->flags
) &&
8221 !test_bit(Faulty
, &rdev
->flags
))
8223 if (rdev
->raid_disk
>= 0)
8225 if (test_bit(Faulty
, &rdev
->flags
))
8227 if (!test_bit(Journal
, &rdev
->flags
)) {
8229 ! (rdev
->saved_raid_disk
>= 0 &&
8230 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8233 rdev
->recovery_offset
= 0;
8236 hot_add_disk(mddev
, rdev
) == 0) {
8237 if (sysfs_link_rdev(mddev
, rdev
))
8238 /* failure here is OK */;
8239 if (!test_bit(Journal
, &rdev
->flags
))
8241 md_new_event(mddev
);
8242 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8247 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8251 static void md_start_sync(struct work_struct
*ws
)
8253 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8256 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8259 if (!mddev
->sync_thread
) {
8260 if (!(mddev_is_clustered(mddev
) && ret
== -EAGAIN
))
8261 printk(KERN_ERR
"%s: could not start resync"
8264 /* leave the spares where they are, it shouldn't hurt */
8265 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8266 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8267 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8268 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8269 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8270 wake_up(&resync_wait
);
8271 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8273 if (mddev
->sysfs_action
)
8274 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8276 md_wakeup_thread(mddev
->sync_thread
);
8277 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8278 md_new_event(mddev
);
8282 * This routine is regularly called by all per-raid-array threads to
8283 * deal with generic issues like resync and super-block update.
8284 * Raid personalities that don't have a thread (linear/raid0) do not
8285 * need this as they never do any recovery or update the superblock.
8287 * It does not do any resync itself, but rather "forks" off other threads
8288 * to do that as needed.
8289 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8290 * "->recovery" and create a thread at ->sync_thread.
8291 * When the thread finishes it sets MD_RECOVERY_DONE
8292 * and wakeups up this thread which will reap the thread and finish up.
8293 * This thread also removes any faulty devices (with nr_pending == 0).
8295 * The overall approach is:
8296 * 1/ if the superblock needs updating, update it.
8297 * 2/ If a recovery thread is running, don't do anything else.
8298 * 3/ If recovery has finished, clean up, possibly marking spares active.
8299 * 4/ If there are any faulty devices, remove them.
8300 * 5/ If array is degraded, try to add spares devices
8301 * 6/ If array has spares or is not in-sync, start a resync thread.
8303 void md_check_recovery(struct mddev
*mddev
)
8305 if (mddev
->suspended
)
8309 bitmap_daemon_work(mddev
);
8311 if (signal_pending(current
)) {
8312 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8313 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8315 mddev
->safemode
= 2;
8317 flush_signals(current
);
8320 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8323 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8324 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8325 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8326 test_bit(MD_RELOAD_SB
, &mddev
->flags
) ||
8327 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8328 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8329 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8333 if (mddev_trylock(mddev
)) {
8337 struct md_rdev
*rdev
;
8338 if (!mddev
->external
&& mddev
->in_sync
)
8339 /* 'Blocked' flag not needed as failed devices
8340 * will be recorded if array switched to read/write.
8341 * Leaving it set will prevent the device
8342 * from being removed.
8344 rdev_for_each(rdev
, mddev
)
8345 clear_bit(Blocked
, &rdev
->flags
);
8346 /* On a read-only array we can:
8347 * - remove failed devices
8348 * - add already-in_sync devices if the array itself
8350 * As we only add devices that are already in-sync,
8351 * we can activate the spares immediately.
8353 remove_and_add_spares(mddev
, NULL
);
8354 /* There is no thread, but we need to call
8355 * ->spare_active and clear saved_raid_disk
8357 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8358 md_reap_sync_thread(mddev
);
8359 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8360 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8361 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8365 if (mddev_is_clustered(mddev
)) {
8366 struct md_rdev
*rdev
;
8367 /* kick the device if another node issued a
8370 rdev_for_each(rdev
, mddev
) {
8371 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8372 rdev
->raid_disk
< 0)
8373 md_kick_rdev_from_array(rdev
);
8376 if (test_and_clear_bit(MD_RELOAD_SB
, &mddev
->flags
))
8377 md_reload_sb(mddev
, mddev
->good_device_nr
);
8380 if (!mddev
->external
) {
8382 spin_lock(&mddev
->lock
);
8383 if (mddev
->safemode
&&
8384 !atomic_read(&mddev
->writes_pending
) &&
8386 mddev
->recovery_cp
== MaxSector
) {
8389 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8391 if (mddev
->safemode
== 1)
8392 mddev
->safemode
= 0;
8393 spin_unlock(&mddev
->lock
);
8395 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8398 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
8399 md_update_sb(mddev
, 0);
8401 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8402 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8403 /* resync/recovery still happening */
8404 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8407 if (mddev
->sync_thread
) {
8408 md_reap_sync_thread(mddev
);
8411 /* Set RUNNING before clearing NEEDED to avoid
8412 * any transients in the value of "sync_action".
8414 mddev
->curr_resync_completed
= 0;
8415 spin_lock(&mddev
->lock
);
8416 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8417 spin_unlock(&mddev
->lock
);
8418 /* Clear some bits that don't mean anything, but
8421 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8422 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8424 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8425 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8427 /* no recovery is running.
8428 * remove any failed drives, then
8429 * add spares if possible.
8430 * Spares are also removed and re-added, to allow
8431 * the personality to fail the re-add.
8434 if (mddev
->reshape_position
!= MaxSector
) {
8435 if (mddev
->pers
->check_reshape
== NULL
||
8436 mddev
->pers
->check_reshape(mddev
) != 0)
8437 /* Cannot proceed */
8439 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8440 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8441 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8442 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8443 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8444 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8445 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8446 } else if (mddev
->recovery_cp
< MaxSector
) {
8447 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8448 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8449 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8450 /* nothing to be done ... */
8453 if (mddev
->pers
->sync_request
) {
8455 /* We are adding a device or devices to an array
8456 * which has the bitmap stored on all devices.
8457 * So make sure all bitmap pages get written
8459 bitmap_write_all(mddev
->bitmap
);
8461 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8462 queue_work(md_misc_wq
, &mddev
->del_work
);
8466 if (!mddev
->sync_thread
) {
8467 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8468 wake_up(&resync_wait
);
8469 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8471 if (mddev
->sysfs_action
)
8472 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8475 wake_up(&mddev
->sb_wait
);
8476 mddev_unlock(mddev
);
8479 EXPORT_SYMBOL(md_check_recovery
);
8481 void md_reap_sync_thread(struct mddev
*mddev
)
8483 struct md_rdev
*rdev
;
8485 /* resync has finished, collect result */
8486 md_unregister_thread(&mddev
->sync_thread
);
8487 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8488 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8490 /* activate any spares */
8491 if (mddev
->pers
->spare_active(mddev
)) {
8492 sysfs_notify(&mddev
->kobj
, NULL
,
8494 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8497 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8498 mddev
->pers
->finish_reshape
)
8499 mddev
->pers
->finish_reshape(mddev
);
8501 /* If array is no-longer degraded, then any saved_raid_disk
8502 * information must be scrapped.
8504 if (!mddev
->degraded
)
8505 rdev_for_each(rdev
, mddev
)
8506 rdev
->saved_raid_disk
= -1;
8508 md_update_sb(mddev
, 1);
8509 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8510 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8511 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8512 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8513 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8514 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8515 wake_up(&resync_wait
);
8516 /* flag recovery needed just to double check */
8517 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8518 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8519 md_new_event(mddev
);
8520 if (mddev
->event_work
.func
)
8521 queue_work(md_misc_wq
, &mddev
->event_work
);
8523 EXPORT_SYMBOL(md_reap_sync_thread
);
8525 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8527 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8528 wait_event_timeout(rdev
->blocked_wait
,
8529 !test_bit(Blocked
, &rdev
->flags
) &&
8530 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8531 msecs_to_jiffies(5000));
8532 rdev_dec_pending(rdev
, mddev
);
8534 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8536 void md_finish_reshape(struct mddev
*mddev
)
8538 /* called be personality module when reshape completes. */
8539 struct md_rdev
*rdev
;
8541 rdev_for_each(rdev
, mddev
) {
8542 if (rdev
->data_offset
> rdev
->new_data_offset
)
8543 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8545 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8546 rdev
->data_offset
= rdev
->new_data_offset
;
8549 EXPORT_SYMBOL(md_finish_reshape
);
8551 /* Bad block management */
8553 /* Returns 1 on success, 0 on failure */
8554 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8557 struct mddev
*mddev
= rdev
->mddev
;
8560 s
+= rdev
->new_data_offset
;
8562 s
+= rdev
->data_offset
;
8563 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8565 /* Make sure they get written out promptly */
8566 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8567 set_mask_bits(&mddev
->flags
, 0,
8568 BIT(MD_CHANGE_CLEAN
) | BIT(MD_CHANGE_PENDING
));
8569 md_wakeup_thread(rdev
->mddev
->thread
);
8574 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8576 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8580 s
+= rdev
->new_data_offset
;
8582 s
+= rdev
->data_offset
;
8583 return badblocks_clear(&rdev
->badblocks
,
8586 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8588 static int md_notify_reboot(struct notifier_block
*this,
8589 unsigned long code
, void *x
)
8591 struct list_head
*tmp
;
8592 struct mddev
*mddev
;
8595 for_each_mddev(mddev
, tmp
) {
8596 if (mddev_trylock(mddev
)) {
8598 __md_stop_writes(mddev
);
8599 if (mddev
->persistent
)
8600 mddev
->safemode
= 2;
8601 mddev_unlock(mddev
);
8606 * certain more exotic SCSI devices are known to be
8607 * volatile wrt too early system reboots. While the
8608 * right place to handle this issue is the given
8609 * driver, we do want to have a safe RAID driver ...
8617 static struct notifier_block md_notifier
= {
8618 .notifier_call
= md_notify_reboot
,
8620 .priority
= INT_MAX
, /* before any real devices */
8623 static void md_geninit(void)
8625 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8627 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8630 static int __init
md_init(void)
8634 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8638 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8642 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8645 if ((ret
= register_blkdev(0, "mdp")) < 0)
8649 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8650 md_probe
, NULL
, NULL
);
8651 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8652 md_probe
, NULL
, NULL
);
8654 register_reboot_notifier(&md_notifier
);
8655 raid_table_header
= register_sysctl_table(raid_root_table
);
8661 unregister_blkdev(MD_MAJOR
, "md");
8663 destroy_workqueue(md_misc_wq
);
8665 destroy_workqueue(md_wq
);
8670 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8672 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8673 struct md_rdev
*rdev2
;
8675 char b
[BDEVNAME_SIZE
];
8677 /* Check for change of roles in the active devices */
8678 rdev_for_each(rdev2
, mddev
) {
8679 if (test_bit(Faulty
, &rdev2
->flags
))
8682 /* Check if the roles changed */
8683 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8685 if (test_bit(Candidate
, &rdev2
->flags
)) {
8686 if (role
== 0xfffe) {
8687 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
8688 md_kick_rdev_from_array(rdev2
);
8692 clear_bit(Candidate
, &rdev2
->flags
);
8695 if (role
!= rdev2
->raid_disk
) {
8697 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8698 rdev2
->saved_raid_disk
= role
;
8699 ret
= remove_and_add_spares(mddev
, rdev2
);
8700 pr_info("Activated spare: %s\n",
8701 bdevname(rdev2
->bdev
,b
));
8702 /* wakeup mddev->thread here, so array could
8703 * perform resync with the new activated disk */
8704 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8705 md_wakeup_thread(mddev
->thread
);
8709 * We just want to do the minimum to mark the disk
8710 * as faulty. The recovery is performed by the
8711 * one who initiated the error.
8713 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8714 md_error(mddev
, rdev2
);
8715 clear_bit(Blocked
, &rdev2
->flags
);
8720 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
8721 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
8723 /* Finally set the event to be up to date */
8724 mddev
->events
= le64_to_cpu(sb
->events
);
8727 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8730 struct page
*swapout
= rdev
->sb_page
;
8731 struct mdp_superblock_1
*sb
;
8733 /* Store the sb page of the rdev in the swapout temporary
8734 * variable in case we err in the future
8736 rdev
->sb_page
= NULL
;
8737 alloc_disk_sb(rdev
);
8738 ClearPageUptodate(rdev
->sb_page
);
8739 rdev
->sb_loaded
= 0;
8740 err
= super_types
[mddev
->major_version
].load_super(rdev
, NULL
, mddev
->minor_version
);
8743 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8744 __func__
, __LINE__
, rdev
->desc_nr
, err
);
8745 put_page(rdev
->sb_page
);
8746 rdev
->sb_page
= swapout
;
8747 rdev
->sb_loaded
= 1;
8751 sb
= page_address(rdev
->sb_page
);
8752 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8756 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
8757 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
8759 /* The other node finished recovery, call spare_active to set
8760 * device In_sync and mddev->degraded
8762 if (rdev
->recovery_offset
== MaxSector
&&
8763 !test_bit(In_sync
, &rdev
->flags
) &&
8764 mddev
->pers
->spare_active(mddev
))
8765 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8771 void md_reload_sb(struct mddev
*mddev
, int nr
)
8773 struct md_rdev
*rdev
;
8777 rdev_for_each_rcu(rdev
, mddev
) {
8778 if (rdev
->desc_nr
== nr
)
8782 if (!rdev
|| rdev
->desc_nr
!= nr
) {
8783 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
8787 err
= read_rdev(mddev
, rdev
);
8791 check_sb_changes(mddev
, rdev
);
8793 /* Read all rdev's to update recovery_offset */
8794 rdev_for_each_rcu(rdev
, mddev
)
8795 read_rdev(mddev
, rdev
);
8797 EXPORT_SYMBOL(md_reload_sb
);
8802 * Searches all registered partitions for autorun RAID arrays
8806 static LIST_HEAD(all_detected_devices
);
8807 struct detected_devices_node
{
8808 struct list_head list
;
8812 void md_autodetect_dev(dev_t dev
)
8814 struct detected_devices_node
*node_detected_dev
;
8816 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8817 if (node_detected_dev
) {
8818 node_detected_dev
->dev
= dev
;
8819 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8821 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8822 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8826 static void autostart_arrays(int part
)
8828 struct md_rdev
*rdev
;
8829 struct detected_devices_node
*node_detected_dev
;
8831 int i_scanned
, i_passed
;
8836 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8838 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8840 node_detected_dev
= list_entry(all_detected_devices
.next
,
8841 struct detected_devices_node
, list
);
8842 list_del(&node_detected_dev
->list
);
8843 dev
= node_detected_dev
->dev
;
8844 kfree(node_detected_dev
);
8845 rdev
= md_import_device(dev
,0, 90);
8849 if (test_bit(Faulty
, &rdev
->flags
))
8852 set_bit(AutoDetected
, &rdev
->flags
);
8853 list_add(&rdev
->same_set
, &pending_raid_disks
);
8857 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8858 i_scanned
, i_passed
);
8860 autorun_devices(part
);
8863 #endif /* !MODULE */
8865 static __exit
void md_exit(void)
8867 struct mddev
*mddev
;
8868 struct list_head
*tmp
;
8871 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8872 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8874 unregister_blkdev(MD_MAJOR
,"md");
8875 unregister_blkdev(mdp_major
, "mdp");
8876 unregister_reboot_notifier(&md_notifier
);
8877 unregister_sysctl_table(raid_table_header
);
8879 /* We cannot unload the modules while some process is
8880 * waiting for us in select() or poll() - wake them up
8883 while (waitqueue_active(&md_event_waiters
)) {
8884 /* not safe to leave yet */
8885 wake_up(&md_event_waiters
);
8889 remove_proc_entry("mdstat", NULL
);
8891 for_each_mddev(mddev
, tmp
) {
8892 export_array(mddev
);
8893 mddev
->hold_active
= 0;
8895 destroy_workqueue(md_misc_wq
);
8896 destroy_workqueue(md_wq
);
8899 subsys_initcall(md_init
);
8900 module_exit(md_exit
)
8902 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8904 return sprintf(buffer
, "%d", start_readonly
);
8906 static int set_ro(const char *val
, struct kernel_param
*kp
)
8908 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
8911 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8912 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8913 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8915 MODULE_LICENSE("GPL");
8916 MODULE_DESCRIPTION("MD RAID framework");
8918 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);