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 bio_set_op_attrs(bi
, REQ_OP_WRITE
, 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_PREFLUSH
;
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_set_op_attrs(bio
, REQ_OP_WRITE
, 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 op
, int op_flags
, 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
;
766 bio_set_op_attrs(bio
, op
, op_flags
);
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
, REQ_OP_READ
, 0, 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
, REQ_OP_READ
, 0, 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 md_kick_rdev_from_array(rdev
);
2489 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2491 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2492 if (mddev
->degraded
)
2493 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
2494 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2495 md_new_event(mddev
);
2496 md_wakeup_thread(mddev
->thread
);
2500 /* words written to sysfs files may, or may not, be \n terminated.
2501 * We want to accept with case. For this we use cmd_match.
2503 static int cmd_match(const char *cmd
, const char *str
)
2505 /* See if cmd, written into a sysfs file, matches
2506 * str. They must either be the same, or cmd can
2507 * have a trailing newline
2509 while (*cmd
&& *str
&& *cmd
== *str
) {
2520 struct rdev_sysfs_entry
{
2521 struct attribute attr
;
2522 ssize_t (*show
)(struct md_rdev
*, char *);
2523 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2527 state_show(struct md_rdev
*rdev
, char *page
)
2531 unsigned long flags
= ACCESS_ONCE(rdev
->flags
);
2533 if (test_bit(Faulty
, &flags
) ||
2534 rdev
->badblocks
.unacked_exist
) {
2535 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2538 if (test_bit(In_sync
, &flags
)) {
2539 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2542 if (test_bit(Journal
, &flags
)) {
2543 len
+= sprintf(page
+len
, "%sjournal",sep
);
2546 if (test_bit(WriteMostly
, &flags
)) {
2547 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2550 if (test_bit(Blocked
, &flags
) ||
2551 (rdev
->badblocks
.unacked_exist
2552 && !test_bit(Faulty
, &flags
))) {
2553 len
+= sprintf(page
+len
, "%sblocked", sep
);
2556 if (!test_bit(Faulty
, &flags
) &&
2557 !test_bit(Journal
, &flags
) &&
2558 !test_bit(In_sync
, &flags
)) {
2559 len
+= sprintf(page
+len
, "%sspare", sep
);
2562 if (test_bit(WriteErrorSeen
, &flags
)) {
2563 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2566 if (test_bit(WantReplacement
, &flags
)) {
2567 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2570 if (test_bit(Replacement
, &flags
)) {
2571 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2575 return len
+sprintf(page
+len
, "\n");
2579 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2582 * faulty - simulates an error
2583 * remove - disconnects the device
2584 * writemostly - sets write_mostly
2585 * -writemostly - clears write_mostly
2586 * blocked - sets the Blocked flags
2587 * -blocked - clears the Blocked and possibly simulates an error
2588 * insync - sets Insync providing device isn't active
2589 * -insync - clear Insync for a device with a slot assigned,
2590 * so that it gets rebuilt based on bitmap
2591 * write_error - sets WriteErrorSeen
2592 * -write_error - clears WriteErrorSeen
2595 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2596 md_error(rdev
->mddev
, rdev
);
2597 if (test_bit(Faulty
, &rdev
->flags
))
2601 } else if (cmd_match(buf
, "remove")) {
2602 if (rdev
->mddev
->pers
) {
2603 clear_bit(Blocked
, &rdev
->flags
);
2604 remove_and_add_spares(rdev
->mddev
, rdev
);
2606 if (rdev
->raid_disk
>= 0)
2609 struct mddev
*mddev
= rdev
->mddev
;
2611 if (mddev_is_clustered(mddev
))
2612 err
= md_cluster_ops
->remove_disk(mddev
, rdev
);
2615 md_kick_rdev_from_array(rdev
);
2617 md_update_sb(mddev
, 1);
2618 md_new_event(mddev
);
2621 } else if (cmd_match(buf
, "writemostly")) {
2622 set_bit(WriteMostly
, &rdev
->flags
);
2624 } else if (cmd_match(buf
, "-writemostly")) {
2625 clear_bit(WriteMostly
, &rdev
->flags
);
2627 } else if (cmd_match(buf
, "blocked")) {
2628 set_bit(Blocked
, &rdev
->flags
);
2630 } else if (cmd_match(buf
, "-blocked")) {
2631 if (!test_bit(Faulty
, &rdev
->flags
) &&
2632 rdev
->badblocks
.unacked_exist
) {
2633 /* metadata handler doesn't understand badblocks,
2634 * so we need to fail the device
2636 md_error(rdev
->mddev
, rdev
);
2638 clear_bit(Blocked
, &rdev
->flags
);
2639 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2640 wake_up(&rdev
->blocked_wait
);
2641 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2642 md_wakeup_thread(rdev
->mddev
->thread
);
2645 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2646 set_bit(In_sync
, &rdev
->flags
);
2648 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0 &&
2649 !test_bit(Journal
, &rdev
->flags
)) {
2650 if (rdev
->mddev
->pers
== NULL
) {
2651 clear_bit(In_sync
, &rdev
->flags
);
2652 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2653 rdev
->raid_disk
= -1;
2656 } else if (cmd_match(buf
, "write_error")) {
2657 set_bit(WriteErrorSeen
, &rdev
->flags
);
2659 } else if (cmd_match(buf
, "-write_error")) {
2660 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2662 } else if (cmd_match(buf
, "want_replacement")) {
2663 /* Any non-spare device that is not a replacement can
2664 * become want_replacement at any time, but we then need to
2665 * check if recovery is needed.
2667 if (rdev
->raid_disk
>= 0 &&
2668 !test_bit(Journal
, &rdev
->flags
) &&
2669 !test_bit(Replacement
, &rdev
->flags
))
2670 set_bit(WantReplacement
, &rdev
->flags
);
2671 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2672 md_wakeup_thread(rdev
->mddev
->thread
);
2674 } else if (cmd_match(buf
, "-want_replacement")) {
2675 /* Clearing 'want_replacement' is always allowed.
2676 * Once replacements starts it is too late though.
2679 clear_bit(WantReplacement
, &rdev
->flags
);
2680 } else if (cmd_match(buf
, "replacement")) {
2681 /* Can only set a device as a replacement when array has not
2682 * yet been started. Once running, replacement is automatic
2683 * from spares, or by assigning 'slot'.
2685 if (rdev
->mddev
->pers
)
2688 set_bit(Replacement
, &rdev
->flags
);
2691 } else if (cmd_match(buf
, "-replacement")) {
2692 /* Similarly, can only clear Replacement before start */
2693 if (rdev
->mddev
->pers
)
2696 clear_bit(Replacement
, &rdev
->flags
);
2699 } else if (cmd_match(buf
, "re-add")) {
2700 if (test_bit(Faulty
, &rdev
->flags
) && (rdev
->raid_disk
== -1)) {
2701 /* clear_bit is performed _after_ all the devices
2702 * have their local Faulty bit cleared. If any writes
2703 * happen in the meantime in the local node, they
2704 * will land in the local bitmap, which will be synced
2705 * by this node eventually
2707 if (!mddev_is_clustered(rdev
->mddev
) ||
2708 (err
= md_cluster_ops
->gather_bitmaps(rdev
)) == 0) {
2709 clear_bit(Faulty
, &rdev
->flags
);
2710 err
= add_bound_rdev(rdev
);
2716 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2717 return err
? err
: len
;
2719 static struct rdev_sysfs_entry rdev_state
=
2720 __ATTR_PREALLOC(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2723 errors_show(struct md_rdev
*rdev
, char *page
)
2725 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2729 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2734 rv
= kstrtouint(buf
, 10, &n
);
2737 atomic_set(&rdev
->corrected_errors
, n
);
2740 static struct rdev_sysfs_entry rdev_errors
=
2741 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2744 slot_show(struct md_rdev
*rdev
, char *page
)
2746 if (test_bit(Journal
, &rdev
->flags
))
2747 return sprintf(page
, "journal\n");
2748 else if (rdev
->raid_disk
< 0)
2749 return sprintf(page
, "none\n");
2751 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2755 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2760 if (test_bit(Journal
, &rdev
->flags
))
2762 if (strncmp(buf
, "none", 4)==0)
2765 err
= kstrtouint(buf
, 10, (unsigned int *)&slot
);
2769 if (rdev
->mddev
->pers
&& slot
== -1) {
2770 /* Setting 'slot' on an active array requires also
2771 * updating the 'rd%d' link, and communicating
2772 * with the personality with ->hot_*_disk.
2773 * For now we only support removing
2774 * failed/spare devices. This normally happens automatically,
2775 * but not when the metadata is externally managed.
2777 if (rdev
->raid_disk
== -1)
2779 /* personality does all needed checks */
2780 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2782 clear_bit(Blocked
, &rdev
->flags
);
2783 remove_and_add_spares(rdev
->mddev
, rdev
);
2784 if (rdev
->raid_disk
>= 0)
2786 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2787 md_wakeup_thread(rdev
->mddev
->thread
);
2788 } else if (rdev
->mddev
->pers
) {
2789 /* Activating a spare .. or possibly reactivating
2790 * if we ever get bitmaps working here.
2794 if (rdev
->raid_disk
!= -1)
2797 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2800 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2803 if (slot
>= rdev
->mddev
->raid_disks
&&
2804 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2807 rdev
->raid_disk
= slot
;
2808 if (test_bit(In_sync
, &rdev
->flags
))
2809 rdev
->saved_raid_disk
= slot
;
2811 rdev
->saved_raid_disk
= -1;
2812 clear_bit(In_sync
, &rdev
->flags
);
2813 clear_bit(Bitmap_sync
, &rdev
->flags
);
2814 err
= rdev
->mddev
->pers
->
2815 hot_add_disk(rdev
->mddev
, rdev
);
2817 rdev
->raid_disk
= -1;
2820 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2821 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2822 /* failure here is OK */;
2823 /* don't wakeup anyone, leave that to userspace. */
2825 if (slot
>= rdev
->mddev
->raid_disks
&&
2826 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2828 rdev
->raid_disk
= slot
;
2829 /* assume it is working */
2830 clear_bit(Faulty
, &rdev
->flags
);
2831 clear_bit(WriteMostly
, &rdev
->flags
);
2832 set_bit(In_sync
, &rdev
->flags
);
2833 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2838 static struct rdev_sysfs_entry rdev_slot
=
2839 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2842 offset_show(struct md_rdev
*rdev
, char *page
)
2844 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2848 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2850 unsigned long long offset
;
2851 if (kstrtoull(buf
, 10, &offset
) < 0)
2853 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2855 if (rdev
->sectors
&& rdev
->mddev
->external
)
2856 /* Must set offset before size, so overlap checks
2859 rdev
->data_offset
= offset
;
2860 rdev
->new_data_offset
= offset
;
2864 static struct rdev_sysfs_entry rdev_offset
=
2865 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2867 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2869 return sprintf(page
, "%llu\n",
2870 (unsigned long long)rdev
->new_data_offset
);
2873 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2874 const char *buf
, size_t len
)
2876 unsigned long long new_offset
;
2877 struct mddev
*mddev
= rdev
->mddev
;
2879 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2882 if (mddev
->sync_thread
||
2883 test_bit(MD_RECOVERY_RUNNING
,&mddev
->recovery
))
2885 if (new_offset
== rdev
->data_offset
)
2886 /* reset is always permitted */
2888 else if (new_offset
> rdev
->data_offset
) {
2889 /* must not push array size beyond rdev_sectors */
2890 if (new_offset
- rdev
->data_offset
2891 + mddev
->dev_sectors
> rdev
->sectors
)
2894 /* Metadata worries about other space details. */
2896 /* decreasing the offset is inconsistent with a backwards
2899 if (new_offset
< rdev
->data_offset
&&
2900 mddev
->reshape_backwards
)
2902 /* Increasing offset is inconsistent with forwards
2903 * reshape. reshape_direction should be set to
2904 * 'backwards' first.
2906 if (new_offset
> rdev
->data_offset
&&
2907 !mddev
->reshape_backwards
)
2910 if (mddev
->pers
&& mddev
->persistent
&&
2911 !super_types
[mddev
->major_version
]
2912 .allow_new_offset(rdev
, new_offset
))
2914 rdev
->new_data_offset
= new_offset
;
2915 if (new_offset
> rdev
->data_offset
)
2916 mddev
->reshape_backwards
= 1;
2917 else if (new_offset
< rdev
->data_offset
)
2918 mddev
->reshape_backwards
= 0;
2922 static struct rdev_sysfs_entry rdev_new_offset
=
2923 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2926 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2928 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2931 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2933 /* check if two start/length pairs overlap */
2941 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2943 unsigned long long blocks
;
2946 if (kstrtoull(buf
, 10, &blocks
) < 0)
2949 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2950 return -EINVAL
; /* sector conversion overflow */
2953 if (new != blocks
* 2)
2954 return -EINVAL
; /* unsigned long long to sector_t overflow */
2961 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2963 struct mddev
*my_mddev
= rdev
->mddev
;
2964 sector_t oldsectors
= rdev
->sectors
;
2967 if (test_bit(Journal
, &rdev
->flags
))
2969 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2971 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2972 return -EINVAL
; /* too confusing */
2973 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2974 if (my_mddev
->persistent
) {
2975 sectors
= super_types
[my_mddev
->major_version
].
2976 rdev_size_change(rdev
, sectors
);
2979 } else if (!sectors
)
2980 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2982 if (!my_mddev
->pers
->resize
)
2983 /* Cannot change size for RAID0 or Linear etc */
2986 if (sectors
< my_mddev
->dev_sectors
)
2987 return -EINVAL
; /* component must fit device */
2989 rdev
->sectors
= sectors
;
2990 if (sectors
> oldsectors
&& my_mddev
->external
) {
2991 /* Need to check that all other rdevs with the same
2992 * ->bdev do not overlap. 'rcu' is sufficient to walk
2993 * the rdev lists safely.
2994 * This check does not provide a hard guarantee, it
2995 * just helps avoid dangerous mistakes.
2997 struct mddev
*mddev
;
2999 struct list_head
*tmp
;
3002 for_each_mddev(mddev
, tmp
) {
3003 struct md_rdev
*rdev2
;
3005 rdev_for_each(rdev2
, mddev
)
3006 if (rdev
->bdev
== rdev2
->bdev
&&
3008 overlaps(rdev
->data_offset
, rdev
->sectors
,
3021 /* Someone else could have slipped in a size
3022 * change here, but doing so is just silly.
3023 * We put oldsectors back because we *know* it is
3024 * safe, and trust userspace not to race with
3027 rdev
->sectors
= oldsectors
;
3034 static struct rdev_sysfs_entry rdev_size
=
3035 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3037 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3039 unsigned long long recovery_start
= rdev
->recovery_offset
;
3041 if (test_bit(In_sync
, &rdev
->flags
) ||
3042 recovery_start
== MaxSector
)
3043 return sprintf(page
, "none\n");
3045 return sprintf(page
, "%llu\n", recovery_start
);
3048 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3050 unsigned long long recovery_start
;
3052 if (cmd_match(buf
, "none"))
3053 recovery_start
= MaxSector
;
3054 else if (kstrtoull(buf
, 10, &recovery_start
))
3057 if (rdev
->mddev
->pers
&&
3058 rdev
->raid_disk
>= 0)
3061 rdev
->recovery_offset
= recovery_start
;
3062 if (recovery_start
== MaxSector
)
3063 set_bit(In_sync
, &rdev
->flags
);
3065 clear_bit(In_sync
, &rdev
->flags
);
3069 static struct rdev_sysfs_entry rdev_recovery_start
=
3070 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3072 /* sysfs access to bad-blocks list.
3073 * We present two files.
3074 * 'bad-blocks' lists sector numbers and lengths of ranges that
3075 * are recorded as bad. The list is truncated to fit within
3076 * the one-page limit of sysfs.
3077 * Writing "sector length" to this file adds an acknowledged
3079 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
3080 * been acknowledged. Writing to this file adds bad blocks
3081 * without acknowledging them. This is largely for testing.
3083 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3085 return badblocks_show(&rdev
->badblocks
, page
, 0);
3087 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3089 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3090 /* Maybe that ack was all we needed */
3091 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3092 wake_up(&rdev
->blocked_wait
);
3095 static struct rdev_sysfs_entry rdev_bad_blocks
=
3096 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3098 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3100 return badblocks_show(&rdev
->badblocks
, page
, 1);
3102 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3104 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3106 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3107 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3109 static struct attribute
*rdev_default_attrs
[] = {
3114 &rdev_new_offset
.attr
,
3116 &rdev_recovery_start
.attr
,
3117 &rdev_bad_blocks
.attr
,
3118 &rdev_unack_bad_blocks
.attr
,
3122 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3124 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3125 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3131 return entry
->show(rdev
, page
);
3135 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3136 const char *page
, size_t length
)
3138 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3139 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3141 struct mddev
*mddev
= rdev
->mddev
;
3145 if (!capable(CAP_SYS_ADMIN
))
3147 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3149 if (rdev
->mddev
== NULL
)
3152 rv
= entry
->store(rdev
, page
, length
);
3153 mddev_unlock(mddev
);
3158 static void rdev_free(struct kobject
*ko
)
3160 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3163 static const struct sysfs_ops rdev_sysfs_ops
= {
3164 .show
= rdev_attr_show
,
3165 .store
= rdev_attr_store
,
3167 static struct kobj_type rdev_ktype
= {
3168 .release
= rdev_free
,
3169 .sysfs_ops
= &rdev_sysfs_ops
,
3170 .default_attrs
= rdev_default_attrs
,
3173 int md_rdev_init(struct md_rdev
*rdev
)
3176 rdev
->saved_raid_disk
= -1;
3177 rdev
->raid_disk
= -1;
3179 rdev
->data_offset
= 0;
3180 rdev
->new_data_offset
= 0;
3181 rdev
->sb_events
= 0;
3182 rdev
->last_read_error
= 0;
3183 rdev
->sb_loaded
= 0;
3184 rdev
->bb_page
= NULL
;
3185 atomic_set(&rdev
->nr_pending
, 0);
3186 atomic_set(&rdev
->read_errors
, 0);
3187 atomic_set(&rdev
->corrected_errors
, 0);
3189 INIT_LIST_HEAD(&rdev
->same_set
);
3190 init_waitqueue_head(&rdev
->blocked_wait
);
3192 /* Add space to store bad block list.
3193 * This reserves the space even on arrays where it cannot
3194 * be used - I wonder if that matters
3196 return badblocks_init(&rdev
->badblocks
, 0);
3198 EXPORT_SYMBOL_GPL(md_rdev_init
);
3200 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3202 * mark the device faulty if:
3204 * - the device is nonexistent (zero size)
3205 * - the device has no valid superblock
3207 * a faulty rdev _never_ has rdev->sb set.
3209 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3211 char b
[BDEVNAME_SIZE
];
3213 struct md_rdev
*rdev
;
3216 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3218 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3219 return ERR_PTR(-ENOMEM
);
3222 err
= md_rdev_init(rdev
);
3225 err
= alloc_disk_sb(rdev
);
3229 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3233 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3235 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3238 "md: %s has zero or unknown size, marking faulty!\n",
3239 bdevname(rdev
->bdev
,b
));
3244 if (super_format
>= 0) {
3245 err
= super_types
[super_format
].
3246 load_super(rdev
, NULL
, super_minor
);
3247 if (err
== -EINVAL
) {
3249 "md: %s does not have a valid v%d.%d "
3250 "superblock, not importing!\n",
3251 bdevname(rdev
->bdev
,b
),
3252 super_format
, super_minor
);
3257 "md: could not read %s's sb, not importing!\n",
3258 bdevname(rdev
->bdev
,b
));
3268 md_rdev_clear(rdev
);
3270 return ERR_PTR(err
);
3274 * Check a full RAID array for plausibility
3277 static void analyze_sbs(struct mddev
*mddev
)
3280 struct md_rdev
*rdev
, *freshest
, *tmp
;
3281 char b
[BDEVNAME_SIZE
];
3284 rdev_for_each_safe(rdev
, tmp
, mddev
)
3285 switch (super_types
[mddev
->major_version
].
3286 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3294 "md: fatal superblock inconsistency in %s"
3295 " -- removing from array\n",
3296 bdevname(rdev
->bdev
,b
));
3297 md_kick_rdev_from_array(rdev
);
3300 super_types
[mddev
->major_version
].
3301 validate_super(mddev
, freshest
);
3304 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3305 if (mddev
->max_disks
&&
3306 (rdev
->desc_nr
>= mddev
->max_disks
||
3307 i
> mddev
->max_disks
)) {
3309 "md: %s: %s: only %d devices permitted\n",
3310 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3312 md_kick_rdev_from_array(rdev
);
3315 if (rdev
!= freshest
) {
3316 if (super_types
[mddev
->major_version
].
3317 validate_super(mddev
, rdev
)) {
3318 printk(KERN_WARNING
"md: kicking non-fresh %s"
3320 bdevname(rdev
->bdev
,b
));
3321 md_kick_rdev_from_array(rdev
);
3325 if (mddev
->level
== LEVEL_MULTIPATH
) {
3326 rdev
->desc_nr
= i
++;
3327 rdev
->raid_disk
= rdev
->desc_nr
;
3328 set_bit(In_sync
, &rdev
->flags
);
3329 } else if (rdev
->raid_disk
>=
3330 (mddev
->raid_disks
- min(0, mddev
->delta_disks
)) &&
3331 !test_bit(Journal
, &rdev
->flags
)) {
3332 rdev
->raid_disk
= -1;
3333 clear_bit(In_sync
, &rdev
->flags
);
3338 /* Read a fixed-point number.
3339 * Numbers in sysfs attributes should be in "standard" units where
3340 * possible, so time should be in seconds.
3341 * However we internally use a a much smaller unit such as
3342 * milliseconds or jiffies.
3343 * This function takes a decimal number with a possible fractional
3344 * component, and produces an integer which is the result of
3345 * multiplying that number by 10^'scale'.
3346 * all without any floating-point arithmetic.
3348 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3350 unsigned long result
= 0;
3352 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3355 else if (decimals
< scale
) {
3358 result
= result
* 10 + value
;
3370 while (decimals
< scale
) {
3379 safe_delay_show(struct mddev
*mddev
, char *page
)
3381 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3382 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3385 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3389 if (mddev_is_clustered(mddev
)) {
3390 pr_info("md: Safemode is disabled for clustered mode\n");
3394 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3397 mddev
->safemode_delay
= 0;
3399 unsigned long old_delay
= mddev
->safemode_delay
;
3400 unsigned long new_delay
= (msec
*HZ
)/1000;
3404 mddev
->safemode_delay
= new_delay
;
3405 if (new_delay
< old_delay
|| old_delay
== 0)
3406 mod_timer(&mddev
->safemode_timer
, jiffies
+1);
3410 static struct md_sysfs_entry md_safe_delay
=
3411 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3414 level_show(struct mddev
*mddev
, char *page
)
3416 struct md_personality
*p
;
3418 spin_lock(&mddev
->lock
);
3421 ret
= sprintf(page
, "%s\n", p
->name
);
3422 else if (mddev
->clevel
[0])
3423 ret
= sprintf(page
, "%s\n", mddev
->clevel
);
3424 else if (mddev
->level
!= LEVEL_NONE
)
3425 ret
= sprintf(page
, "%d\n", mddev
->level
);
3428 spin_unlock(&mddev
->lock
);
3433 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3438 struct md_personality
*pers
, *oldpers
;
3440 void *priv
, *oldpriv
;
3441 struct md_rdev
*rdev
;
3443 if (slen
== 0 || slen
>= sizeof(clevel
))
3446 rv
= mddev_lock(mddev
);
3450 if (mddev
->pers
== NULL
) {
3451 strncpy(mddev
->clevel
, buf
, slen
);
3452 if (mddev
->clevel
[slen
-1] == '\n')
3454 mddev
->clevel
[slen
] = 0;
3455 mddev
->level
= LEVEL_NONE
;
3463 /* request to change the personality. Need to ensure:
3464 * - array is not engaged in resync/recovery/reshape
3465 * - old personality can be suspended
3466 * - new personality will access other array.
3470 if (mddev
->sync_thread
||
3471 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3472 mddev
->reshape_position
!= MaxSector
||
3473 mddev
->sysfs_active
)
3477 if (!mddev
->pers
->quiesce
) {
3478 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3479 mdname(mddev
), mddev
->pers
->name
);
3483 /* Now find the new personality */
3484 strncpy(clevel
, buf
, slen
);
3485 if (clevel
[slen
-1] == '\n')
3488 if (kstrtol(clevel
, 10, &level
))
3491 if (request_module("md-%s", clevel
) != 0)
3492 request_module("md-level-%s", clevel
);
3493 spin_lock(&pers_lock
);
3494 pers
= find_pers(level
, clevel
);
3495 if (!pers
|| !try_module_get(pers
->owner
)) {
3496 spin_unlock(&pers_lock
);
3497 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3501 spin_unlock(&pers_lock
);
3503 if (pers
== mddev
->pers
) {
3504 /* Nothing to do! */
3505 module_put(pers
->owner
);
3509 if (!pers
->takeover
) {
3510 module_put(pers
->owner
);
3511 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3512 mdname(mddev
), clevel
);
3517 rdev_for_each(rdev
, mddev
)
3518 rdev
->new_raid_disk
= rdev
->raid_disk
;
3520 /* ->takeover must set new_* and/or delta_disks
3521 * if it succeeds, and may set them when it fails.
3523 priv
= pers
->takeover(mddev
);
3525 mddev
->new_level
= mddev
->level
;
3526 mddev
->new_layout
= mddev
->layout
;
3527 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3528 mddev
->raid_disks
-= mddev
->delta_disks
;
3529 mddev
->delta_disks
= 0;
3530 mddev
->reshape_backwards
= 0;
3531 module_put(pers
->owner
);
3532 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3533 mdname(mddev
), clevel
);
3538 /* Looks like we have a winner */
3539 mddev_suspend(mddev
);
3540 mddev_detach(mddev
);
3542 spin_lock(&mddev
->lock
);
3543 oldpers
= mddev
->pers
;
3544 oldpriv
= mddev
->private;
3546 mddev
->private = priv
;
3547 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3548 mddev
->level
= mddev
->new_level
;
3549 mddev
->layout
= mddev
->new_layout
;
3550 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3551 mddev
->delta_disks
= 0;
3552 mddev
->reshape_backwards
= 0;
3553 mddev
->degraded
= 0;
3554 spin_unlock(&mddev
->lock
);
3556 if (oldpers
->sync_request
== NULL
&&
3558 /* We are converting from a no-redundancy array
3559 * to a redundancy array and metadata is managed
3560 * externally so we need to be sure that writes
3561 * won't block due to a need to transition
3563 * until external management is started.
3566 mddev
->safemode_delay
= 0;
3567 mddev
->safemode
= 0;
3570 oldpers
->free(mddev
, oldpriv
);
3572 if (oldpers
->sync_request
== NULL
&&
3573 pers
->sync_request
!= NULL
) {
3574 /* need to add the md_redundancy_group */
3575 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3577 "md: cannot register extra attributes for %s\n",
3579 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3581 if (oldpers
->sync_request
!= NULL
&&
3582 pers
->sync_request
== NULL
) {
3583 /* need to remove the md_redundancy_group */
3584 if (mddev
->to_remove
== NULL
)
3585 mddev
->to_remove
= &md_redundancy_group
;
3588 module_put(oldpers
->owner
);
3590 rdev_for_each(rdev
, mddev
) {
3591 if (rdev
->raid_disk
< 0)
3593 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3594 rdev
->new_raid_disk
= -1;
3595 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3597 sysfs_unlink_rdev(mddev
, rdev
);
3599 rdev_for_each(rdev
, mddev
) {
3600 if (rdev
->raid_disk
< 0)
3602 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3604 rdev
->raid_disk
= rdev
->new_raid_disk
;
3605 if (rdev
->raid_disk
< 0)
3606 clear_bit(In_sync
, &rdev
->flags
);
3608 if (sysfs_link_rdev(mddev
, rdev
))
3609 printk(KERN_WARNING
"md: cannot register rd%d"
3610 " for %s after level change\n",
3611 rdev
->raid_disk
, mdname(mddev
));
3615 if (pers
->sync_request
== NULL
) {
3616 /* this is now an array without redundancy, so
3617 * it must always be in_sync
3620 del_timer_sync(&mddev
->safemode_timer
);
3622 blk_set_stacking_limits(&mddev
->queue
->limits
);
3624 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3625 mddev_resume(mddev
);
3627 md_update_sb(mddev
, 1);
3628 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3629 md_new_event(mddev
);
3632 mddev_unlock(mddev
);
3636 static struct md_sysfs_entry md_level
=
3637 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3640 layout_show(struct mddev
*mddev
, char *page
)
3642 /* just a number, not meaningful for all levels */
3643 if (mddev
->reshape_position
!= MaxSector
&&
3644 mddev
->layout
!= mddev
->new_layout
)
3645 return sprintf(page
, "%d (%d)\n",
3646 mddev
->new_layout
, mddev
->layout
);
3647 return sprintf(page
, "%d\n", mddev
->layout
);
3651 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3656 err
= kstrtouint(buf
, 10, &n
);
3659 err
= mddev_lock(mddev
);
3664 if (mddev
->pers
->check_reshape
== NULL
)
3669 mddev
->new_layout
= n
;
3670 err
= mddev
->pers
->check_reshape(mddev
);
3672 mddev
->new_layout
= mddev
->layout
;
3675 mddev
->new_layout
= n
;
3676 if (mddev
->reshape_position
== MaxSector
)
3679 mddev_unlock(mddev
);
3682 static struct md_sysfs_entry md_layout
=
3683 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3686 raid_disks_show(struct mddev
*mddev
, char *page
)
3688 if (mddev
->raid_disks
== 0)
3690 if (mddev
->reshape_position
!= MaxSector
&&
3691 mddev
->delta_disks
!= 0)
3692 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3693 mddev
->raid_disks
- mddev
->delta_disks
);
3694 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3697 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3700 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3705 err
= kstrtouint(buf
, 10, &n
);
3709 err
= mddev_lock(mddev
);
3713 err
= update_raid_disks(mddev
, n
);
3714 else if (mddev
->reshape_position
!= MaxSector
) {
3715 struct md_rdev
*rdev
;
3716 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3719 rdev_for_each(rdev
, mddev
) {
3721 rdev
->data_offset
< rdev
->new_data_offset
)
3724 rdev
->data_offset
> rdev
->new_data_offset
)
3728 mddev
->delta_disks
= n
- olddisks
;
3729 mddev
->raid_disks
= n
;
3730 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3732 mddev
->raid_disks
= n
;
3734 mddev_unlock(mddev
);
3735 return err
? err
: len
;
3737 static struct md_sysfs_entry md_raid_disks
=
3738 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3741 chunk_size_show(struct mddev
*mddev
, char *page
)
3743 if (mddev
->reshape_position
!= MaxSector
&&
3744 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3745 return sprintf(page
, "%d (%d)\n",
3746 mddev
->new_chunk_sectors
<< 9,
3747 mddev
->chunk_sectors
<< 9);
3748 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3752 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3757 err
= kstrtoul(buf
, 10, &n
);
3761 err
= mddev_lock(mddev
);
3765 if (mddev
->pers
->check_reshape
== NULL
)
3770 mddev
->new_chunk_sectors
= n
>> 9;
3771 err
= mddev
->pers
->check_reshape(mddev
);
3773 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3776 mddev
->new_chunk_sectors
= n
>> 9;
3777 if (mddev
->reshape_position
== MaxSector
)
3778 mddev
->chunk_sectors
= n
>> 9;
3780 mddev_unlock(mddev
);
3783 static struct md_sysfs_entry md_chunk_size
=
3784 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3787 resync_start_show(struct mddev
*mddev
, char *page
)
3789 if (mddev
->recovery_cp
== MaxSector
)
3790 return sprintf(page
, "none\n");
3791 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3795 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3797 unsigned long long n
;
3800 if (cmd_match(buf
, "none"))
3803 err
= kstrtoull(buf
, 10, &n
);
3806 if (n
!= (sector_t
)n
)
3810 err
= mddev_lock(mddev
);
3813 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3817 mddev
->recovery_cp
= n
;
3819 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3821 mddev_unlock(mddev
);
3824 static struct md_sysfs_entry md_resync_start
=
3825 __ATTR_PREALLOC(resync_start
, S_IRUGO
|S_IWUSR
,
3826 resync_start_show
, resync_start_store
);
3829 * The array state can be:
3832 * No devices, no size, no level
3833 * Equivalent to STOP_ARRAY ioctl
3835 * May have some settings, but array is not active
3836 * all IO results in error
3837 * When written, doesn't tear down array, but just stops it
3838 * suspended (not supported yet)
3839 * All IO requests will block. The array can be reconfigured.
3840 * Writing this, if accepted, will block until array is quiescent
3842 * no resync can happen. no superblocks get written.
3843 * write requests fail
3845 * like readonly, but behaves like 'clean' on a write request.
3847 * clean - no pending writes, but otherwise active.
3848 * When written to inactive array, starts without resync
3849 * If a write request arrives then
3850 * if metadata is known, mark 'dirty' and switch to 'active'.
3851 * if not known, block and switch to write-pending
3852 * If written to an active array that has pending writes, then fails.
3854 * fully active: IO and resync can be happening.
3855 * When written to inactive array, starts with resync
3858 * clean, but writes are blocked waiting for 'active' to be written.
3861 * like active, but no writes have been seen for a while (100msec).
3864 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3865 write_pending
, active_idle
, bad_word
};
3866 static char *array_states
[] = {
3867 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3868 "write-pending", "active-idle", NULL
};
3870 static int match_word(const char *word
, char **list
)
3873 for (n
=0; list
[n
]; n
++)
3874 if (cmd_match(word
, list
[n
]))
3880 array_state_show(struct mddev
*mddev
, char *page
)
3882 enum array_state st
= inactive
;
3895 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3897 else if (mddev
->safemode
)
3903 if (list_empty(&mddev
->disks
) &&
3904 mddev
->raid_disks
== 0 &&
3905 mddev
->dev_sectors
== 0)
3910 return sprintf(page
, "%s\n", array_states
[st
]);
3913 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3914 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3915 static int do_md_run(struct mddev
*mddev
);
3916 static int restart_array(struct mddev
*mddev
);
3919 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3922 enum array_state st
= match_word(buf
, array_states
);
3924 if (mddev
->pers
&& (st
== active
|| st
== clean
) && mddev
->ro
!= 1) {
3925 /* don't take reconfig_mutex when toggling between
3928 spin_lock(&mddev
->lock
);
3930 restart_array(mddev
);
3931 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3932 wake_up(&mddev
->sb_wait
);
3934 } else /* st == clean */ {
3935 restart_array(mddev
);
3936 if (atomic_read(&mddev
->writes_pending
) == 0) {
3937 if (mddev
->in_sync
== 0) {
3939 if (mddev
->safemode
== 1)
3940 mddev
->safemode
= 0;
3941 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3948 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3949 spin_unlock(&mddev
->lock
);
3952 err
= mddev_lock(mddev
);
3960 /* stopping an active array */
3961 err
= do_md_stop(mddev
, 0, NULL
);
3964 /* stopping an active array */
3966 err
= do_md_stop(mddev
, 2, NULL
);
3968 err
= 0; /* already inactive */
3971 break; /* not supported yet */
3974 err
= md_set_readonly(mddev
, NULL
);
3977 set_disk_ro(mddev
->gendisk
, 1);
3978 err
= do_md_run(mddev
);
3984 err
= md_set_readonly(mddev
, NULL
);
3985 else if (mddev
->ro
== 1)
3986 err
= restart_array(mddev
);
3989 set_disk_ro(mddev
->gendisk
, 0);
3993 err
= do_md_run(mddev
);
3998 err
= restart_array(mddev
);
4001 spin_lock(&mddev
->lock
);
4002 if (atomic_read(&mddev
->writes_pending
) == 0) {
4003 if (mddev
->in_sync
== 0) {
4005 if (mddev
->safemode
== 1)
4006 mddev
->safemode
= 0;
4007 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
4012 spin_unlock(&mddev
->lock
);
4018 err
= restart_array(mddev
);
4021 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
4022 wake_up(&mddev
->sb_wait
);
4026 set_disk_ro(mddev
->gendisk
, 0);
4027 err
= do_md_run(mddev
);
4032 /* these cannot be set */
4037 if (mddev
->hold_active
== UNTIL_IOCTL
)
4038 mddev
->hold_active
= 0;
4039 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4041 mddev_unlock(mddev
);
4044 static struct md_sysfs_entry md_array_state
=
4045 __ATTR_PREALLOC(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
4048 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
4049 return sprintf(page
, "%d\n",
4050 atomic_read(&mddev
->max_corr_read_errors
));
4054 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4059 rv
= kstrtouint(buf
, 10, &n
);
4062 atomic_set(&mddev
->max_corr_read_errors
, n
);
4066 static struct md_sysfs_entry max_corr_read_errors
=
4067 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
4068 max_corrected_read_errors_store
);
4071 null_show(struct mddev
*mddev
, char *page
)
4077 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4079 /* buf must be %d:%d\n? giving major and minor numbers */
4080 /* The new device is added to the array.
4081 * If the array has a persistent superblock, we read the
4082 * superblock to initialise info and check validity.
4083 * Otherwise, only checking done is that in bind_rdev_to_array,
4084 * which mainly checks size.
4087 int major
= simple_strtoul(buf
, &e
, 10);
4090 struct md_rdev
*rdev
;
4093 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4095 minor
= simple_strtoul(e
+1, &e
, 10);
4096 if (*e
&& *e
!= '\n')
4098 dev
= MKDEV(major
, minor
);
4099 if (major
!= MAJOR(dev
) ||
4100 minor
!= MINOR(dev
))
4103 flush_workqueue(md_misc_wq
);
4105 err
= mddev_lock(mddev
);
4108 if (mddev
->persistent
) {
4109 rdev
= md_import_device(dev
, mddev
->major_version
,
4110 mddev
->minor_version
);
4111 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4112 struct md_rdev
*rdev0
4113 = list_entry(mddev
->disks
.next
,
4114 struct md_rdev
, same_set
);
4115 err
= super_types
[mddev
->major_version
]
4116 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4120 } else if (mddev
->external
)
4121 rdev
= md_import_device(dev
, -2, -1);
4123 rdev
= md_import_device(dev
, -1, -1);
4126 mddev_unlock(mddev
);
4127 return PTR_ERR(rdev
);
4129 err
= bind_rdev_to_array(rdev
, mddev
);
4133 mddev_unlock(mddev
);
4134 return err
? err
: len
;
4137 static struct md_sysfs_entry md_new_device
=
4138 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4141 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4144 unsigned long chunk
, end_chunk
;
4147 err
= mddev_lock(mddev
);
4152 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4154 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4155 if (buf
== end
) break;
4156 if (*end
== '-') { /* range */
4158 end_chunk
= simple_strtoul(buf
, &end
, 0);
4159 if (buf
== end
) break;
4161 if (*end
&& !isspace(*end
)) break;
4162 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4163 buf
= skip_spaces(end
);
4165 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4167 mddev_unlock(mddev
);
4171 static struct md_sysfs_entry md_bitmap
=
4172 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4175 size_show(struct mddev
*mddev
, char *page
)
4177 return sprintf(page
, "%llu\n",
4178 (unsigned long long)mddev
->dev_sectors
/ 2);
4181 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4184 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4186 /* If array is inactive, we can reduce the component size, but
4187 * not increase it (except from 0).
4188 * If array is active, we can try an on-line resize
4191 int err
= strict_blocks_to_sectors(buf
, §ors
);
4195 err
= mddev_lock(mddev
);
4199 err
= update_size(mddev
, sectors
);
4201 md_update_sb(mddev
, 1);
4203 if (mddev
->dev_sectors
== 0 ||
4204 mddev
->dev_sectors
> sectors
)
4205 mddev
->dev_sectors
= sectors
;
4209 mddev_unlock(mddev
);
4210 return err
? err
: len
;
4213 static struct md_sysfs_entry md_size
=
4214 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4216 /* Metadata version.
4218 * 'none' for arrays with no metadata (good luck...)
4219 * 'external' for arrays with externally managed metadata,
4220 * or N.M for internally known formats
4223 metadata_show(struct mddev
*mddev
, char *page
)
4225 if (mddev
->persistent
)
4226 return sprintf(page
, "%d.%d\n",
4227 mddev
->major_version
, mddev
->minor_version
);
4228 else if (mddev
->external
)
4229 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4231 return sprintf(page
, "none\n");
4235 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4240 /* Changing the details of 'external' metadata is
4241 * always permitted. Otherwise there must be
4242 * no devices attached to the array.
4245 err
= mddev_lock(mddev
);
4249 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4251 else if (!list_empty(&mddev
->disks
))
4255 if (cmd_match(buf
, "none")) {
4256 mddev
->persistent
= 0;
4257 mddev
->external
= 0;
4258 mddev
->major_version
= 0;
4259 mddev
->minor_version
= 90;
4262 if (strncmp(buf
, "external:", 9) == 0) {
4263 size_t namelen
= len
-9;
4264 if (namelen
>= sizeof(mddev
->metadata_type
))
4265 namelen
= sizeof(mddev
->metadata_type
)-1;
4266 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4267 mddev
->metadata_type
[namelen
] = 0;
4268 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4269 mddev
->metadata_type
[--namelen
] = 0;
4270 mddev
->persistent
= 0;
4271 mddev
->external
= 1;
4272 mddev
->major_version
= 0;
4273 mddev
->minor_version
= 90;
4276 major
= simple_strtoul(buf
, &e
, 10);
4278 if (e
==buf
|| *e
!= '.')
4281 minor
= simple_strtoul(buf
, &e
, 10);
4282 if (e
==buf
|| (*e
&& *e
!= '\n') )
4285 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4287 mddev
->major_version
= major
;
4288 mddev
->minor_version
= minor
;
4289 mddev
->persistent
= 1;
4290 mddev
->external
= 0;
4293 mddev_unlock(mddev
);
4297 static struct md_sysfs_entry md_metadata
=
4298 __ATTR_PREALLOC(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4301 action_show(struct mddev
*mddev
, char *page
)
4303 char *type
= "idle";
4304 unsigned long recovery
= mddev
->recovery
;
4305 if (test_bit(MD_RECOVERY_FROZEN
, &recovery
))
4307 else if (test_bit(MD_RECOVERY_RUNNING
, &recovery
) ||
4308 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &recovery
))) {
4309 if (test_bit(MD_RECOVERY_RESHAPE
, &recovery
))
4311 else if (test_bit(MD_RECOVERY_SYNC
, &recovery
)) {
4312 if (!test_bit(MD_RECOVERY_REQUESTED
, &recovery
))
4314 else if (test_bit(MD_RECOVERY_CHECK
, &recovery
))
4318 } else if (test_bit(MD_RECOVERY_RECOVER
, &recovery
))
4320 else if (mddev
->reshape_position
!= MaxSector
)
4323 return sprintf(page
, "%s\n", type
);
4327 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4329 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4333 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4334 if (cmd_match(page
, "frozen"))
4335 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4337 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4338 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4339 mddev_lock(mddev
) == 0) {
4340 flush_workqueue(md_misc_wq
);
4341 if (mddev
->sync_thread
) {
4342 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4343 md_reap_sync_thread(mddev
);
4345 mddev_unlock(mddev
);
4347 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4349 else if (cmd_match(page
, "resync"))
4350 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4351 else if (cmd_match(page
, "recover")) {
4352 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4353 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4354 } else if (cmd_match(page
, "reshape")) {
4356 if (mddev
->pers
->start_reshape
== NULL
)
4358 err
= mddev_lock(mddev
);
4360 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4363 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4364 err
= mddev
->pers
->start_reshape(mddev
);
4366 mddev_unlock(mddev
);
4370 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4372 if (cmd_match(page
, "check"))
4373 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4374 else if (!cmd_match(page
, "repair"))
4376 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4377 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4378 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4380 if (mddev
->ro
== 2) {
4381 /* A write to sync_action is enough to justify
4382 * canceling read-auto mode
4385 md_wakeup_thread(mddev
->sync_thread
);
4387 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4388 md_wakeup_thread(mddev
->thread
);
4389 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4393 static struct md_sysfs_entry md_scan_mode
=
4394 __ATTR_PREALLOC(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4397 last_sync_action_show(struct mddev
*mddev
, char *page
)
4399 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4402 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4405 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4407 return sprintf(page
, "%llu\n",
4408 (unsigned long long)
4409 atomic64_read(&mddev
->resync_mismatches
));
4412 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4415 sync_min_show(struct mddev
*mddev
, char *page
)
4417 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4418 mddev
->sync_speed_min
? "local": "system");
4422 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4427 if (strncmp(buf
, "system", 6)==0) {
4430 rv
= kstrtouint(buf
, 10, &min
);
4436 mddev
->sync_speed_min
= min
;
4440 static struct md_sysfs_entry md_sync_min
=
4441 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4444 sync_max_show(struct mddev
*mddev
, char *page
)
4446 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4447 mddev
->sync_speed_max
? "local": "system");
4451 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4456 if (strncmp(buf
, "system", 6)==0) {
4459 rv
= kstrtouint(buf
, 10, &max
);
4465 mddev
->sync_speed_max
= max
;
4469 static struct md_sysfs_entry md_sync_max
=
4470 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4473 degraded_show(struct mddev
*mddev
, char *page
)
4475 return sprintf(page
, "%d\n", mddev
->degraded
);
4477 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4480 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4482 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4486 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4490 if (kstrtol(buf
, 10, &n
))
4493 if (n
!= 0 && n
!= 1)
4496 mddev
->parallel_resync
= n
;
4498 if (mddev
->sync_thread
)
4499 wake_up(&resync_wait
);
4504 /* force parallel resync, even with shared block devices */
4505 static struct md_sysfs_entry md_sync_force_parallel
=
4506 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4507 sync_force_parallel_show
, sync_force_parallel_store
);
4510 sync_speed_show(struct mddev
*mddev
, char *page
)
4512 unsigned long resync
, dt
, db
;
4513 if (mddev
->curr_resync
== 0)
4514 return sprintf(page
, "none\n");
4515 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4516 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4518 db
= resync
- mddev
->resync_mark_cnt
;
4519 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4522 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4525 sync_completed_show(struct mddev
*mddev
, char *page
)
4527 unsigned long long max_sectors
, resync
;
4529 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4530 return sprintf(page
, "none\n");
4532 if (mddev
->curr_resync
== 1 ||
4533 mddev
->curr_resync
== 2)
4534 return sprintf(page
, "delayed\n");
4536 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4537 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4538 max_sectors
= mddev
->resync_max_sectors
;
4540 max_sectors
= mddev
->dev_sectors
;
4542 resync
= mddev
->curr_resync_completed
;
4543 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4546 static struct md_sysfs_entry md_sync_completed
=
4547 __ATTR_PREALLOC(sync_completed
, S_IRUGO
, sync_completed_show
, NULL
);
4550 min_sync_show(struct mddev
*mddev
, char *page
)
4552 return sprintf(page
, "%llu\n",
4553 (unsigned long long)mddev
->resync_min
);
4556 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4558 unsigned long long min
;
4561 if (kstrtoull(buf
, 10, &min
))
4564 spin_lock(&mddev
->lock
);
4566 if (min
> mddev
->resync_max
)
4570 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4573 /* Round down to multiple of 4K for safety */
4574 mddev
->resync_min
= round_down(min
, 8);
4578 spin_unlock(&mddev
->lock
);
4582 static struct md_sysfs_entry md_min_sync
=
4583 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4586 max_sync_show(struct mddev
*mddev
, char *page
)
4588 if (mddev
->resync_max
== MaxSector
)
4589 return sprintf(page
, "max\n");
4591 return sprintf(page
, "%llu\n",
4592 (unsigned long long)mddev
->resync_max
);
4595 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4598 spin_lock(&mddev
->lock
);
4599 if (strncmp(buf
, "max", 3) == 0)
4600 mddev
->resync_max
= MaxSector
;
4602 unsigned long long max
;
4606 if (kstrtoull(buf
, 10, &max
))
4608 if (max
< mddev
->resync_min
)
4612 if (max
< mddev
->resync_max
&&
4614 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4617 /* Must be a multiple of chunk_size */
4618 chunk
= mddev
->chunk_sectors
;
4620 sector_t temp
= max
;
4623 if (sector_div(temp
, chunk
))
4626 mddev
->resync_max
= max
;
4628 wake_up(&mddev
->recovery_wait
);
4631 spin_unlock(&mddev
->lock
);
4635 static struct md_sysfs_entry md_max_sync
=
4636 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4639 suspend_lo_show(struct mddev
*mddev
, char *page
)
4641 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4645 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4647 unsigned long long old
, new;
4650 err
= kstrtoull(buf
, 10, &new);
4653 if (new != (sector_t
)new)
4656 err
= mddev_lock(mddev
);
4660 if (mddev
->pers
== NULL
||
4661 mddev
->pers
->quiesce
== NULL
)
4663 old
= mddev
->suspend_lo
;
4664 mddev
->suspend_lo
= new;
4666 /* Shrinking suspended region */
4667 mddev
->pers
->quiesce(mddev
, 2);
4669 /* Expanding suspended region - need to wait */
4670 mddev
->pers
->quiesce(mddev
, 1);
4671 mddev
->pers
->quiesce(mddev
, 0);
4675 mddev_unlock(mddev
);
4678 static struct md_sysfs_entry md_suspend_lo
=
4679 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4682 suspend_hi_show(struct mddev
*mddev
, char *page
)
4684 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4688 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4690 unsigned long long old
, new;
4693 err
= kstrtoull(buf
, 10, &new);
4696 if (new != (sector_t
)new)
4699 err
= mddev_lock(mddev
);
4703 if (mddev
->pers
== NULL
||
4704 mddev
->pers
->quiesce
== NULL
)
4706 old
= mddev
->suspend_hi
;
4707 mddev
->suspend_hi
= new;
4709 /* Shrinking suspended region */
4710 mddev
->pers
->quiesce(mddev
, 2);
4712 /* Expanding suspended region - need to wait */
4713 mddev
->pers
->quiesce(mddev
, 1);
4714 mddev
->pers
->quiesce(mddev
, 0);
4718 mddev_unlock(mddev
);
4721 static struct md_sysfs_entry md_suspend_hi
=
4722 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4725 reshape_position_show(struct mddev
*mddev
, char *page
)
4727 if (mddev
->reshape_position
!= MaxSector
)
4728 return sprintf(page
, "%llu\n",
4729 (unsigned long long)mddev
->reshape_position
);
4730 strcpy(page
, "none\n");
4735 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4737 struct md_rdev
*rdev
;
4738 unsigned long long new;
4741 err
= kstrtoull(buf
, 10, &new);
4744 if (new != (sector_t
)new)
4746 err
= mddev_lock(mddev
);
4752 mddev
->reshape_position
= new;
4753 mddev
->delta_disks
= 0;
4754 mddev
->reshape_backwards
= 0;
4755 mddev
->new_level
= mddev
->level
;
4756 mddev
->new_layout
= mddev
->layout
;
4757 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4758 rdev_for_each(rdev
, mddev
)
4759 rdev
->new_data_offset
= rdev
->data_offset
;
4762 mddev_unlock(mddev
);
4766 static struct md_sysfs_entry md_reshape_position
=
4767 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4768 reshape_position_store
);
4771 reshape_direction_show(struct mddev
*mddev
, char *page
)
4773 return sprintf(page
, "%s\n",
4774 mddev
->reshape_backwards
? "backwards" : "forwards");
4778 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4783 if (cmd_match(buf
, "forwards"))
4785 else if (cmd_match(buf
, "backwards"))
4789 if (mddev
->reshape_backwards
== backwards
)
4792 err
= mddev_lock(mddev
);
4795 /* check if we are allowed to change */
4796 if (mddev
->delta_disks
)
4798 else if (mddev
->persistent
&&
4799 mddev
->major_version
== 0)
4802 mddev
->reshape_backwards
= backwards
;
4803 mddev_unlock(mddev
);
4807 static struct md_sysfs_entry md_reshape_direction
=
4808 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4809 reshape_direction_store
);
4812 array_size_show(struct mddev
*mddev
, char *page
)
4814 if (mddev
->external_size
)
4815 return sprintf(page
, "%llu\n",
4816 (unsigned long long)mddev
->array_sectors
/2);
4818 return sprintf(page
, "default\n");
4822 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4827 err
= mddev_lock(mddev
);
4831 /* cluster raid doesn't support change array_sectors */
4832 if (mddev_is_clustered(mddev
))
4835 if (strncmp(buf
, "default", 7) == 0) {
4837 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4839 sectors
= mddev
->array_sectors
;
4841 mddev
->external_size
= 0;
4843 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4845 else if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4848 mddev
->external_size
= 1;
4852 mddev
->array_sectors
= sectors
;
4854 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4855 revalidate_disk(mddev
->gendisk
);
4858 mddev_unlock(mddev
);
4862 static struct md_sysfs_entry md_array_size
=
4863 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4866 static struct attribute
*md_default_attrs
[] = {
4869 &md_raid_disks
.attr
,
4870 &md_chunk_size
.attr
,
4872 &md_resync_start
.attr
,
4874 &md_new_device
.attr
,
4875 &md_safe_delay
.attr
,
4876 &md_array_state
.attr
,
4877 &md_reshape_position
.attr
,
4878 &md_reshape_direction
.attr
,
4879 &md_array_size
.attr
,
4880 &max_corr_read_errors
.attr
,
4884 static struct attribute
*md_redundancy_attrs
[] = {
4886 &md_last_scan_mode
.attr
,
4887 &md_mismatches
.attr
,
4890 &md_sync_speed
.attr
,
4891 &md_sync_force_parallel
.attr
,
4892 &md_sync_completed
.attr
,
4895 &md_suspend_lo
.attr
,
4896 &md_suspend_hi
.attr
,
4901 static struct attribute_group md_redundancy_group
= {
4903 .attrs
= md_redundancy_attrs
,
4907 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4909 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4910 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4915 spin_lock(&all_mddevs_lock
);
4916 if (list_empty(&mddev
->all_mddevs
)) {
4917 spin_unlock(&all_mddevs_lock
);
4921 spin_unlock(&all_mddevs_lock
);
4923 rv
= entry
->show(mddev
, page
);
4929 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4930 const char *page
, size_t length
)
4932 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4933 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4938 if (!capable(CAP_SYS_ADMIN
))
4940 spin_lock(&all_mddevs_lock
);
4941 if (list_empty(&mddev
->all_mddevs
)) {
4942 spin_unlock(&all_mddevs_lock
);
4946 spin_unlock(&all_mddevs_lock
);
4947 rv
= entry
->store(mddev
, page
, length
);
4952 static void md_free(struct kobject
*ko
)
4954 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4956 if (mddev
->sysfs_state
)
4957 sysfs_put(mddev
->sysfs_state
);
4960 blk_cleanup_queue(mddev
->queue
);
4961 if (mddev
->gendisk
) {
4962 del_gendisk(mddev
->gendisk
);
4963 put_disk(mddev
->gendisk
);
4969 static const struct sysfs_ops md_sysfs_ops
= {
4970 .show
= md_attr_show
,
4971 .store
= md_attr_store
,
4973 static struct kobj_type md_ktype
= {
4975 .sysfs_ops
= &md_sysfs_ops
,
4976 .default_attrs
= md_default_attrs
,
4981 static void mddev_delayed_delete(struct work_struct
*ws
)
4983 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4985 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4986 kobject_del(&mddev
->kobj
);
4987 kobject_put(&mddev
->kobj
);
4990 static int md_alloc(dev_t dev
, char *name
)
4992 static DEFINE_MUTEX(disks_mutex
);
4993 struct mddev
*mddev
= mddev_find(dev
);
4994 struct gendisk
*disk
;
5003 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
5004 shift
= partitioned
? MdpMinorShift
: 0;
5005 unit
= MINOR(mddev
->unit
) >> shift
;
5007 /* wait for any previous instance of this device to be
5008 * completely removed (mddev_delayed_delete).
5010 flush_workqueue(md_misc_wq
);
5012 mutex_lock(&disks_mutex
);
5018 /* Need to ensure that 'name' is not a duplicate.
5020 struct mddev
*mddev2
;
5021 spin_lock(&all_mddevs_lock
);
5023 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
5024 if (mddev2
->gendisk
&&
5025 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
5026 spin_unlock(&all_mddevs_lock
);
5029 spin_unlock(&all_mddevs_lock
);
5033 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
5036 mddev
->queue
->queuedata
= mddev
;
5038 blk_queue_make_request(mddev
->queue
, md_make_request
);
5039 blk_set_stacking_limits(&mddev
->queue
->limits
);
5041 disk
= alloc_disk(1 << shift
);
5043 blk_cleanup_queue(mddev
->queue
);
5044 mddev
->queue
= NULL
;
5047 disk
->major
= MAJOR(mddev
->unit
);
5048 disk
->first_minor
= unit
<< shift
;
5050 strcpy(disk
->disk_name
, name
);
5051 else if (partitioned
)
5052 sprintf(disk
->disk_name
, "md_d%d", unit
);
5054 sprintf(disk
->disk_name
, "md%d", unit
);
5055 disk
->fops
= &md_fops
;
5056 disk
->private_data
= mddev
;
5057 disk
->queue
= mddev
->queue
;
5058 blk_queue_write_cache(mddev
->queue
, true, true);
5059 /* Allow extended partitions. This makes the
5060 * 'mdp' device redundant, but we can't really
5063 disk
->flags
|= GENHD_FL_EXT_DEVT
;
5064 mddev
->gendisk
= disk
;
5065 /* As soon as we call add_disk(), another thread could get
5066 * through to md_open, so make sure it doesn't get too far
5068 mutex_lock(&mddev
->open_mutex
);
5071 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
5072 &disk_to_dev(disk
)->kobj
, "%s", "md");
5074 /* This isn't possible, but as kobject_init_and_add is marked
5075 * __must_check, we must do something with the result
5077 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
5081 if (mddev
->kobj
.sd
&&
5082 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
5083 printk(KERN_DEBUG
"pointless warning\n");
5084 mutex_unlock(&mddev
->open_mutex
);
5086 mutex_unlock(&disks_mutex
);
5087 if (!error
&& mddev
->kobj
.sd
) {
5088 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
5089 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
5095 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
5097 md_alloc(dev
, NULL
);
5101 static int add_named_array(const char *val
, struct kernel_param
*kp
)
5103 /* val must be "md_*" where * is not all digits.
5104 * We allocate an array with a large free minor number, and
5105 * set the name to val. val must not already be an active name.
5107 int len
= strlen(val
);
5108 char buf
[DISK_NAME_LEN
];
5110 while (len
&& val
[len
-1] == '\n')
5112 if (len
>= DISK_NAME_LEN
)
5114 strlcpy(buf
, val
, len
+1);
5115 if (strncmp(buf
, "md_", 3) != 0)
5117 return md_alloc(0, buf
);
5120 static void md_safemode_timeout(unsigned long data
)
5122 struct mddev
*mddev
= (struct mddev
*) data
;
5124 if (!atomic_read(&mddev
->writes_pending
)) {
5125 mddev
->safemode
= 1;
5126 if (mddev
->external
)
5127 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5129 md_wakeup_thread(mddev
->thread
);
5132 static int start_dirty_degraded
;
5134 int md_run(struct mddev
*mddev
)
5137 struct md_rdev
*rdev
;
5138 struct md_personality
*pers
;
5140 if (list_empty(&mddev
->disks
))
5141 /* cannot run an array with no devices.. */
5146 /* Cannot run until previous stop completes properly */
5147 if (mddev
->sysfs_active
)
5151 * Analyze all RAID superblock(s)
5153 if (!mddev
->raid_disks
) {
5154 if (!mddev
->persistent
)
5159 if (mddev
->level
!= LEVEL_NONE
)
5160 request_module("md-level-%d", mddev
->level
);
5161 else if (mddev
->clevel
[0])
5162 request_module("md-%s", mddev
->clevel
);
5165 * Drop all container device buffers, from now on
5166 * the only valid external interface is through the md
5169 rdev_for_each(rdev
, mddev
) {
5170 if (test_bit(Faulty
, &rdev
->flags
))
5172 sync_blockdev(rdev
->bdev
);
5173 invalidate_bdev(rdev
->bdev
);
5175 /* perform some consistency tests on the device.
5176 * We don't want the data to overlap the metadata,
5177 * Internal Bitmap issues have been handled elsewhere.
5179 if (rdev
->meta_bdev
) {
5180 /* Nothing to check */;
5181 } else if (rdev
->data_offset
< rdev
->sb_start
) {
5182 if (mddev
->dev_sectors
&&
5183 rdev
->data_offset
+ mddev
->dev_sectors
5185 printk("md: %s: data overlaps metadata\n",
5190 if (rdev
->sb_start
+ rdev
->sb_size
/512
5191 > rdev
->data_offset
) {
5192 printk("md: %s: metadata overlaps data\n",
5197 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5200 if (mddev
->bio_set
== NULL
)
5201 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5203 spin_lock(&pers_lock
);
5204 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5205 if (!pers
|| !try_module_get(pers
->owner
)) {
5206 spin_unlock(&pers_lock
);
5207 if (mddev
->level
!= LEVEL_NONE
)
5208 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5211 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5215 spin_unlock(&pers_lock
);
5216 if (mddev
->level
!= pers
->level
) {
5217 mddev
->level
= pers
->level
;
5218 mddev
->new_level
= pers
->level
;
5220 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5222 if (mddev
->reshape_position
!= MaxSector
&&
5223 pers
->start_reshape
== NULL
) {
5224 /* This personality cannot handle reshaping... */
5225 module_put(pers
->owner
);
5229 if (pers
->sync_request
) {
5230 /* Warn if this is a potentially silly
5233 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5234 struct md_rdev
*rdev2
;
5237 rdev_for_each(rdev
, mddev
)
5238 rdev_for_each(rdev2
, mddev
) {
5240 rdev
->bdev
->bd_contains
==
5241 rdev2
->bdev
->bd_contains
) {
5243 "%s: WARNING: %s appears to be"
5244 " on the same physical disk as"
5247 bdevname(rdev
->bdev
,b
),
5248 bdevname(rdev2
->bdev
,b2
));
5255 "True protection against single-disk"
5256 " failure might be compromised.\n");
5259 mddev
->recovery
= 0;
5260 /* may be over-ridden by personality */
5261 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5263 mddev
->ok_start_degraded
= start_dirty_degraded
;
5265 if (start_readonly
&& mddev
->ro
== 0)
5266 mddev
->ro
= 2; /* read-only, but switch on first write */
5268 err
= pers
->run(mddev
);
5270 printk(KERN_ERR
"md: pers->run() failed ...\n");
5271 else if (pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5272 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5273 " but 'external_size' not in effect?\n", __func__
);
5275 "md: invalid array_size %llu > default size %llu\n",
5276 (unsigned long long)mddev
->array_sectors
/ 2,
5277 (unsigned long long)pers
->size(mddev
, 0, 0) / 2);
5280 if (err
== 0 && pers
->sync_request
&&
5281 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5282 struct bitmap
*bitmap
;
5284 bitmap
= bitmap_create(mddev
, -1);
5285 if (IS_ERR(bitmap
)) {
5286 err
= PTR_ERR(bitmap
);
5287 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5288 mdname(mddev
), err
);
5290 mddev
->bitmap
= bitmap
;
5294 mddev_detach(mddev
);
5296 pers
->free(mddev
, mddev
->private);
5297 mddev
->private = NULL
;
5298 module_put(pers
->owner
);
5299 bitmap_destroy(mddev
);
5303 mddev
->queue
->backing_dev_info
.congested_data
= mddev
;
5304 mddev
->queue
->backing_dev_info
.congested_fn
= md_congested
;
5306 if (pers
->sync_request
) {
5307 if (mddev
->kobj
.sd
&&
5308 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5310 "md: cannot register extra attributes for %s\n",
5312 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5313 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5316 atomic_set(&mddev
->writes_pending
,0);
5317 atomic_set(&mddev
->max_corr_read_errors
,
5318 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5319 mddev
->safemode
= 0;
5320 if (mddev_is_clustered(mddev
))
5321 mddev
->safemode_delay
= 0;
5323 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5326 spin_lock(&mddev
->lock
);
5328 spin_unlock(&mddev
->lock
);
5329 rdev_for_each(rdev
, mddev
)
5330 if (rdev
->raid_disk
>= 0)
5331 if (sysfs_link_rdev(mddev
, rdev
))
5332 /* failure here is OK */;
5334 if (mddev
->degraded
&& !mddev
->ro
)
5335 /* This ensures that recovering status is reported immediately
5336 * via sysfs - until a lack of spares is confirmed.
5338 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5339 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5341 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5342 md_update_sb(mddev
, 0);
5344 md_new_event(mddev
);
5345 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5346 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5347 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5350 EXPORT_SYMBOL_GPL(md_run
);
5352 static int do_md_run(struct mddev
*mddev
)
5356 err
= md_run(mddev
);
5359 err
= bitmap_load(mddev
);
5361 bitmap_destroy(mddev
);
5365 if (mddev_is_clustered(mddev
))
5366 md_allow_write(mddev
);
5368 md_wakeup_thread(mddev
->thread
);
5369 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5371 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5372 revalidate_disk(mddev
->gendisk
);
5374 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5379 static int restart_array(struct mddev
*mddev
)
5381 struct gendisk
*disk
= mddev
->gendisk
;
5383 /* Complain if it has no devices */
5384 if (list_empty(&mddev
->disks
))
5390 if (test_bit(MD_HAS_JOURNAL
, &mddev
->flags
)) {
5391 struct md_rdev
*rdev
;
5392 bool has_journal
= false;
5395 rdev_for_each_rcu(rdev
, mddev
) {
5396 if (test_bit(Journal
, &rdev
->flags
) &&
5397 !test_bit(Faulty
, &rdev
->flags
)) {
5404 /* Don't restart rw with journal missing/faulty */
5409 mddev
->safemode
= 0;
5411 set_disk_ro(disk
, 0);
5412 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5414 /* Kick recovery or resync if necessary */
5415 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5416 md_wakeup_thread(mddev
->thread
);
5417 md_wakeup_thread(mddev
->sync_thread
);
5418 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5422 static void md_clean(struct mddev
*mddev
)
5424 mddev
->array_sectors
= 0;
5425 mddev
->external_size
= 0;
5426 mddev
->dev_sectors
= 0;
5427 mddev
->raid_disks
= 0;
5428 mddev
->recovery_cp
= 0;
5429 mddev
->resync_min
= 0;
5430 mddev
->resync_max
= MaxSector
;
5431 mddev
->reshape_position
= MaxSector
;
5432 mddev
->external
= 0;
5433 mddev
->persistent
= 0;
5434 mddev
->level
= LEVEL_NONE
;
5435 mddev
->clevel
[0] = 0;
5438 mddev
->metadata_type
[0] = 0;
5439 mddev
->chunk_sectors
= 0;
5440 mddev
->ctime
= mddev
->utime
= 0;
5442 mddev
->max_disks
= 0;
5444 mddev
->can_decrease_events
= 0;
5445 mddev
->delta_disks
= 0;
5446 mddev
->reshape_backwards
= 0;
5447 mddev
->new_level
= LEVEL_NONE
;
5448 mddev
->new_layout
= 0;
5449 mddev
->new_chunk_sectors
= 0;
5450 mddev
->curr_resync
= 0;
5451 atomic64_set(&mddev
->resync_mismatches
, 0);
5452 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5453 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5454 mddev
->recovery
= 0;
5457 mddev
->degraded
= 0;
5458 mddev
->safemode
= 0;
5459 mddev
->private = NULL
;
5460 mddev
->bitmap_info
.offset
= 0;
5461 mddev
->bitmap_info
.default_offset
= 0;
5462 mddev
->bitmap_info
.default_space
= 0;
5463 mddev
->bitmap_info
.chunksize
= 0;
5464 mddev
->bitmap_info
.daemon_sleep
= 0;
5465 mddev
->bitmap_info
.max_write_behind
= 0;
5468 static void __md_stop_writes(struct mddev
*mddev
)
5470 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5471 flush_workqueue(md_misc_wq
);
5472 if (mddev
->sync_thread
) {
5473 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5474 md_reap_sync_thread(mddev
);
5477 del_timer_sync(&mddev
->safemode_timer
);
5479 bitmap_flush(mddev
);
5480 md_super_wait(mddev
);
5482 if (mddev
->ro
== 0 &&
5483 ((!mddev
->in_sync
&& !mddev_is_clustered(mddev
)) ||
5484 (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5485 /* mark array as shutdown cleanly */
5486 if (!mddev_is_clustered(mddev
))
5488 md_update_sb(mddev
, 1);
5492 void md_stop_writes(struct mddev
*mddev
)
5494 mddev_lock_nointr(mddev
);
5495 __md_stop_writes(mddev
);
5496 mddev_unlock(mddev
);
5498 EXPORT_SYMBOL_GPL(md_stop_writes
);
5500 static void mddev_detach(struct mddev
*mddev
)
5502 struct bitmap
*bitmap
= mddev
->bitmap
;
5503 /* wait for behind writes to complete */
5504 if (bitmap
&& atomic_read(&bitmap
->behind_writes
) > 0) {
5505 printk(KERN_INFO
"md:%s: behind writes in progress - waiting to stop.\n",
5507 /* need to kick something here to make sure I/O goes? */
5508 wait_event(bitmap
->behind_wait
,
5509 atomic_read(&bitmap
->behind_writes
) == 0);
5511 if (mddev
->pers
&& mddev
->pers
->quiesce
) {
5512 mddev
->pers
->quiesce(mddev
, 1);
5513 mddev
->pers
->quiesce(mddev
, 0);
5515 md_unregister_thread(&mddev
->thread
);
5517 blk_sync_queue(mddev
->queue
); /* the unplug fn references 'conf'*/
5520 static void __md_stop(struct mddev
*mddev
)
5522 struct md_personality
*pers
= mddev
->pers
;
5523 mddev_detach(mddev
);
5524 /* Ensure ->event_work is done */
5525 flush_workqueue(md_misc_wq
);
5526 spin_lock(&mddev
->lock
);
5528 spin_unlock(&mddev
->lock
);
5529 pers
->free(mddev
, mddev
->private);
5530 mddev
->private = NULL
;
5531 if (pers
->sync_request
&& mddev
->to_remove
== NULL
)
5532 mddev
->to_remove
= &md_redundancy_group
;
5533 module_put(pers
->owner
);
5534 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5537 void md_stop(struct mddev
*mddev
)
5539 /* stop the array and free an attached data structures.
5540 * This is called from dm-raid
5543 bitmap_destroy(mddev
);
5545 bioset_free(mddev
->bio_set
);
5548 EXPORT_SYMBOL_GPL(md_stop
);
5550 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5555 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5557 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5558 md_wakeup_thread(mddev
->thread
);
5560 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5561 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5562 if (mddev
->sync_thread
)
5563 /* Thread might be blocked waiting for metadata update
5564 * which will now never happen */
5565 wake_up_process(mddev
->sync_thread
->tsk
);
5567 if (mddev
->external
&& test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
5569 mddev_unlock(mddev
);
5570 wait_event(resync_wait
, !test_bit(MD_RECOVERY_RUNNING
,
5572 wait_event(mddev
->sb_wait
,
5573 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5574 mddev_lock_nointr(mddev
);
5576 mutex_lock(&mddev
->open_mutex
);
5577 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5578 mddev
->sync_thread
||
5579 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5580 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5581 printk("md: %s still in use.\n",mdname(mddev
));
5583 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5584 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5585 md_wakeup_thread(mddev
->thread
);
5591 __md_stop_writes(mddev
);
5597 set_disk_ro(mddev
->gendisk
, 1);
5598 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5599 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5600 md_wakeup_thread(mddev
->thread
);
5601 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5605 mutex_unlock(&mddev
->open_mutex
);
5610 * 0 - completely stop and dis-assemble array
5611 * 2 - stop but do not disassemble array
5613 static int do_md_stop(struct mddev
*mddev
, int mode
,
5614 struct block_device
*bdev
)
5616 struct gendisk
*disk
= mddev
->gendisk
;
5617 struct md_rdev
*rdev
;
5620 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5622 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5623 md_wakeup_thread(mddev
->thread
);
5625 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
5626 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5627 if (mddev
->sync_thread
)
5628 /* Thread might be blocked waiting for metadata update
5629 * which will now never happen */
5630 wake_up_process(mddev
->sync_thread
->tsk
);
5632 mddev_unlock(mddev
);
5633 wait_event(resync_wait
, (mddev
->sync_thread
== NULL
&&
5634 !test_bit(MD_RECOVERY_RUNNING
,
5635 &mddev
->recovery
)));
5636 mddev_lock_nointr(mddev
);
5638 mutex_lock(&mddev
->open_mutex
);
5639 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5640 mddev
->sysfs_active
||
5641 mddev
->sync_thread
||
5642 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
5643 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5644 printk("md: %s still in use.\n",mdname(mddev
));
5645 mutex_unlock(&mddev
->open_mutex
);
5647 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5648 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5649 md_wakeup_thread(mddev
->thread
);
5655 set_disk_ro(disk
, 0);
5657 __md_stop_writes(mddev
);
5659 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5661 /* tell userspace to handle 'inactive' */
5662 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5664 rdev_for_each(rdev
, mddev
)
5665 if (rdev
->raid_disk
>= 0)
5666 sysfs_unlink_rdev(mddev
, rdev
);
5668 set_capacity(disk
, 0);
5669 mutex_unlock(&mddev
->open_mutex
);
5671 revalidate_disk(disk
);
5676 mutex_unlock(&mddev
->open_mutex
);
5678 * Free resources if final stop
5681 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5683 bitmap_destroy(mddev
);
5684 if (mddev
->bitmap_info
.file
) {
5685 struct file
*f
= mddev
->bitmap_info
.file
;
5686 spin_lock(&mddev
->lock
);
5687 mddev
->bitmap_info
.file
= NULL
;
5688 spin_unlock(&mddev
->lock
);
5691 mddev
->bitmap_info
.offset
= 0;
5693 export_array(mddev
);
5696 if (mddev
->hold_active
== UNTIL_STOP
)
5697 mddev
->hold_active
= 0;
5699 md_new_event(mddev
);
5700 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5705 static void autorun_array(struct mddev
*mddev
)
5707 struct md_rdev
*rdev
;
5710 if (list_empty(&mddev
->disks
))
5713 printk(KERN_INFO
"md: running: ");
5715 rdev_for_each(rdev
, mddev
) {
5716 char b
[BDEVNAME_SIZE
];
5717 printk("<%s>", bdevname(rdev
->bdev
,b
));
5721 err
= do_md_run(mddev
);
5723 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5724 do_md_stop(mddev
, 0, NULL
);
5729 * lets try to run arrays based on all disks that have arrived
5730 * until now. (those are in pending_raid_disks)
5732 * the method: pick the first pending disk, collect all disks with
5733 * the same UUID, remove all from the pending list and put them into
5734 * the 'same_array' list. Then order this list based on superblock
5735 * update time (freshest comes first), kick out 'old' disks and
5736 * compare superblocks. If everything's fine then run it.
5738 * If "unit" is allocated, then bump its reference count
5740 static void autorun_devices(int part
)
5742 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5743 struct mddev
*mddev
;
5744 char b
[BDEVNAME_SIZE
];
5746 printk(KERN_INFO
"md: autorun ...\n");
5747 while (!list_empty(&pending_raid_disks
)) {
5750 LIST_HEAD(candidates
);
5751 rdev0
= list_entry(pending_raid_disks
.next
,
5752 struct md_rdev
, same_set
);
5754 printk(KERN_INFO
"md: considering %s ...\n",
5755 bdevname(rdev0
->bdev
,b
));
5756 INIT_LIST_HEAD(&candidates
);
5757 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5758 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5759 printk(KERN_INFO
"md: adding %s ...\n",
5760 bdevname(rdev
->bdev
,b
));
5761 list_move(&rdev
->same_set
, &candidates
);
5764 * now we have a set of devices, with all of them having
5765 * mostly sane superblocks. It's time to allocate the
5769 dev
= MKDEV(mdp_major
,
5770 rdev0
->preferred_minor
<< MdpMinorShift
);
5771 unit
= MINOR(dev
) >> MdpMinorShift
;
5773 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5776 if (rdev0
->preferred_minor
!= unit
) {
5777 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5778 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5782 md_probe(dev
, NULL
, NULL
);
5783 mddev
= mddev_find(dev
);
5784 if (!mddev
|| !mddev
->gendisk
) {
5788 "md: cannot allocate memory for md drive.\n");
5791 if (mddev_lock(mddev
))
5792 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5794 else if (mddev
->raid_disks
|| mddev
->major_version
5795 || !list_empty(&mddev
->disks
)) {
5797 "md: %s already running, cannot run %s\n",
5798 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5799 mddev_unlock(mddev
);
5801 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5802 mddev
->persistent
= 1;
5803 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5804 list_del_init(&rdev
->same_set
);
5805 if (bind_rdev_to_array(rdev
, mddev
))
5808 autorun_array(mddev
);
5809 mddev_unlock(mddev
);
5811 /* on success, candidates will be empty, on error
5814 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5815 list_del_init(&rdev
->same_set
);
5820 printk(KERN_INFO
"md: ... autorun DONE.\n");
5822 #endif /* !MODULE */
5824 static int get_version(void __user
*arg
)
5828 ver
.major
= MD_MAJOR_VERSION
;
5829 ver
.minor
= MD_MINOR_VERSION
;
5830 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5832 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5838 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5840 mdu_array_info_t info
;
5841 int nr
,working
,insync
,failed
,spare
;
5842 struct md_rdev
*rdev
;
5844 nr
= working
= insync
= failed
= spare
= 0;
5846 rdev_for_each_rcu(rdev
, mddev
) {
5848 if (test_bit(Faulty
, &rdev
->flags
))
5852 if (test_bit(In_sync
, &rdev
->flags
))
5860 info
.major_version
= mddev
->major_version
;
5861 info
.minor_version
= mddev
->minor_version
;
5862 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5863 info
.ctime
= clamp_t(time64_t
, mddev
->ctime
, 0, U32_MAX
);
5864 info
.level
= mddev
->level
;
5865 info
.size
= mddev
->dev_sectors
/ 2;
5866 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5869 info
.raid_disks
= mddev
->raid_disks
;
5870 info
.md_minor
= mddev
->md_minor
;
5871 info
.not_persistent
= !mddev
->persistent
;
5873 info
.utime
= clamp_t(time64_t
, mddev
->utime
, 0, U32_MAX
);
5876 info
.state
= (1<<MD_SB_CLEAN
);
5877 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5878 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5879 if (mddev_is_clustered(mddev
))
5880 info
.state
|= (1<<MD_SB_CLUSTERED
);
5881 info
.active_disks
= insync
;
5882 info
.working_disks
= working
;
5883 info
.failed_disks
= failed
;
5884 info
.spare_disks
= spare
;
5886 info
.layout
= mddev
->layout
;
5887 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5889 if (copy_to_user(arg
, &info
, sizeof(info
)))
5895 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5897 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5901 file
= kzalloc(sizeof(*file
), GFP_NOIO
);
5906 spin_lock(&mddev
->lock
);
5907 /* bitmap enabled */
5908 if (mddev
->bitmap_info
.file
) {
5909 ptr
= file_path(mddev
->bitmap_info
.file
, file
->pathname
,
5910 sizeof(file
->pathname
));
5914 memmove(file
->pathname
, ptr
,
5915 sizeof(file
->pathname
)-(ptr
-file
->pathname
));
5917 spin_unlock(&mddev
->lock
);
5920 copy_to_user(arg
, file
, sizeof(*file
)))
5927 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5929 mdu_disk_info_t info
;
5930 struct md_rdev
*rdev
;
5932 if (copy_from_user(&info
, arg
, sizeof(info
)))
5936 rdev
= md_find_rdev_nr_rcu(mddev
, info
.number
);
5938 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5939 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5940 info
.raid_disk
= rdev
->raid_disk
;
5942 if (test_bit(Faulty
, &rdev
->flags
))
5943 info
.state
|= (1<<MD_DISK_FAULTY
);
5944 else if (test_bit(In_sync
, &rdev
->flags
)) {
5945 info
.state
|= (1<<MD_DISK_ACTIVE
);
5946 info
.state
|= (1<<MD_DISK_SYNC
);
5948 if (test_bit(Journal
, &rdev
->flags
))
5949 info
.state
|= (1<<MD_DISK_JOURNAL
);
5950 if (test_bit(WriteMostly
, &rdev
->flags
))
5951 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5953 info
.major
= info
.minor
= 0;
5954 info
.raid_disk
= -1;
5955 info
.state
= (1<<MD_DISK_REMOVED
);
5959 if (copy_to_user(arg
, &info
, sizeof(info
)))
5965 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5967 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5968 struct md_rdev
*rdev
;
5969 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5971 if (mddev_is_clustered(mddev
) &&
5972 !(info
->state
& ((1 << MD_DISK_CLUSTER_ADD
) | (1 << MD_DISK_CANDIDATE
)))) {
5973 pr_err("%s: Cannot add to clustered mddev.\n",
5978 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5981 if (!mddev
->raid_disks
) {
5983 /* expecting a device which has a superblock */
5984 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5987 "md: md_import_device returned %ld\n",
5989 return PTR_ERR(rdev
);
5991 if (!list_empty(&mddev
->disks
)) {
5992 struct md_rdev
*rdev0
5993 = list_entry(mddev
->disks
.next
,
5994 struct md_rdev
, same_set
);
5995 err
= super_types
[mddev
->major_version
]
5996 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5999 "md: %s has different UUID to %s\n",
6000 bdevname(rdev
->bdev
,b
),
6001 bdevname(rdev0
->bdev
,b2
));
6006 err
= bind_rdev_to_array(rdev
, mddev
);
6013 * add_new_disk can be used once the array is assembled
6014 * to add "hot spares". They must already have a superblock
6019 if (!mddev
->pers
->hot_add_disk
) {
6021 "%s: personality does not support diskops!\n",
6025 if (mddev
->persistent
)
6026 rdev
= md_import_device(dev
, mddev
->major_version
,
6027 mddev
->minor_version
);
6029 rdev
= md_import_device(dev
, -1, -1);
6032 "md: md_import_device returned %ld\n",
6034 return PTR_ERR(rdev
);
6036 /* set saved_raid_disk if appropriate */
6037 if (!mddev
->persistent
) {
6038 if (info
->state
& (1<<MD_DISK_SYNC
) &&
6039 info
->raid_disk
< mddev
->raid_disks
) {
6040 rdev
->raid_disk
= info
->raid_disk
;
6041 set_bit(In_sync
, &rdev
->flags
);
6042 clear_bit(Bitmap_sync
, &rdev
->flags
);
6044 rdev
->raid_disk
= -1;
6045 rdev
->saved_raid_disk
= rdev
->raid_disk
;
6047 super_types
[mddev
->major_version
].
6048 validate_super(mddev
, rdev
);
6049 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
6050 rdev
->raid_disk
!= info
->raid_disk
) {
6051 /* This was a hot-add request, but events doesn't
6052 * match, so reject it.
6058 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
6059 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6060 set_bit(WriteMostly
, &rdev
->flags
);
6062 clear_bit(WriteMostly
, &rdev
->flags
);
6064 if (info
->state
& (1<<MD_DISK_JOURNAL
)) {
6065 struct md_rdev
*rdev2
;
6066 bool has_journal
= false;
6068 /* make sure no existing journal disk */
6069 rdev_for_each(rdev2
, mddev
) {
6070 if (test_bit(Journal
, &rdev2
->flags
)) {
6079 set_bit(Journal
, &rdev
->flags
);
6082 * check whether the device shows up in other nodes
6084 if (mddev_is_clustered(mddev
)) {
6085 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6086 set_bit(Candidate
, &rdev
->flags
);
6087 else if (info
->state
& (1 << MD_DISK_CLUSTER_ADD
)) {
6088 /* --add initiated by this node */
6089 err
= md_cluster_ops
->add_new_disk(mddev
, rdev
);
6097 rdev
->raid_disk
= -1;
6098 err
= bind_rdev_to_array(rdev
, mddev
);
6103 if (mddev_is_clustered(mddev
)) {
6104 if (info
->state
& (1 << MD_DISK_CANDIDATE
))
6105 md_cluster_ops
->new_disk_ack(mddev
, (err
== 0));
6108 md_cluster_ops
->add_new_disk_cancel(mddev
);
6110 err
= add_bound_rdev(rdev
);
6114 err
= add_bound_rdev(rdev
);
6119 /* otherwise, add_new_disk is only allowed
6120 * for major_version==0 superblocks
6122 if (mddev
->major_version
!= 0) {
6123 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
6128 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
6130 rdev
= md_import_device(dev
, -1, 0);
6133 "md: error, md_import_device() returned %ld\n",
6135 return PTR_ERR(rdev
);
6137 rdev
->desc_nr
= info
->number
;
6138 if (info
->raid_disk
< mddev
->raid_disks
)
6139 rdev
->raid_disk
= info
->raid_disk
;
6141 rdev
->raid_disk
= -1;
6143 if (rdev
->raid_disk
< mddev
->raid_disks
)
6144 if (info
->state
& (1<<MD_DISK_SYNC
))
6145 set_bit(In_sync
, &rdev
->flags
);
6147 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
6148 set_bit(WriteMostly
, &rdev
->flags
);
6150 if (!mddev
->persistent
) {
6151 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
6152 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6154 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6155 rdev
->sectors
= rdev
->sb_start
;
6157 err
= bind_rdev_to_array(rdev
, mddev
);
6167 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
6169 char b
[BDEVNAME_SIZE
];
6170 struct md_rdev
*rdev
;
6172 rdev
= find_rdev(mddev
, dev
);
6176 if (rdev
->raid_disk
< 0)
6179 clear_bit(Blocked
, &rdev
->flags
);
6180 remove_and_add_spares(mddev
, rdev
);
6182 if (rdev
->raid_disk
>= 0)
6186 if (mddev_is_clustered(mddev
))
6187 md_cluster_ops
->remove_disk(mddev
, rdev
);
6189 md_kick_rdev_from_array(rdev
);
6190 md_update_sb(mddev
, 1);
6191 md_new_event(mddev
);
6195 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
6196 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6200 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
6202 char b
[BDEVNAME_SIZE
];
6204 struct md_rdev
*rdev
;
6209 if (mddev
->major_version
!= 0) {
6210 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
6211 " version-0 superblocks.\n",
6215 if (!mddev
->pers
->hot_add_disk
) {
6217 "%s: personality does not support diskops!\n",
6222 rdev
= md_import_device(dev
, -1, 0);
6225 "md: error, md_import_device() returned %ld\n",
6230 if (mddev
->persistent
)
6231 rdev
->sb_start
= calc_dev_sboffset(rdev
);
6233 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
6235 rdev
->sectors
= rdev
->sb_start
;
6237 if (test_bit(Faulty
, &rdev
->flags
)) {
6239 "md: can not hot-add faulty %s disk to %s!\n",
6240 bdevname(rdev
->bdev
,b
), mdname(mddev
));
6245 clear_bit(In_sync
, &rdev
->flags
);
6247 rdev
->saved_raid_disk
= -1;
6248 err
= bind_rdev_to_array(rdev
, mddev
);
6253 * The rest should better be atomic, we can have disk failures
6254 * noticed in interrupt contexts ...
6257 rdev
->raid_disk
= -1;
6259 md_update_sb(mddev
, 1);
6261 * Kick recovery, maybe this spare has to be added to the
6262 * array immediately.
6264 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6265 md_wakeup_thread(mddev
->thread
);
6266 md_new_event(mddev
);
6274 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
6279 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
6281 if (mddev
->recovery
|| mddev
->sync_thread
)
6283 /* we should be able to change the bitmap.. */
6287 struct inode
*inode
;
6290 if (mddev
->bitmap
|| mddev
->bitmap_info
.file
)
6291 return -EEXIST
; /* cannot add when bitmap is present */
6295 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6300 inode
= f
->f_mapping
->host
;
6301 if (!S_ISREG(inode
->i_mode
)) {
6302 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
6305 } else if (!(f
->f_mode
& FMODE_WRITE
)) {
6306 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
6309 } else if (atomic_read(&inode
->i_writecount
) != 1) {
6310 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6318 mddev
->bitmap_info
.file
= f
;
6319 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6320 } else if (mddev
->bitmap
== NULL
)
6321 return -ENOENT
; /* cannot remove what isn't there */
6324 mddev
->pers
->quiesce(mddev
, 1);
6326 struct bitmap
*bitmap
;
6328 bitmap
= bitmap_create(mddev
, -1);
6329 if (!IS_ERR(bitmap
)) {
6330 mddev
->bitmap
= bitmap
;
6331 err
= bitmap_load(mddev
);
6333 err
= PTR_ERR(bitmap
);
6335 if (fd
< 0 || err
) {
6336 bitmap_destroy(mddev
);
6337 fd
= -1; /* make sure to put the file */
6339 mddev
->pers
->quiesce(mddev
, 0);
6342 struct file
*f
= mddev
->bitmap_info
.file
;
6344 spin_lock(&mddev
->lock
);
6345 mddev
->bitmap_info
.file
= NULL
;
6346 spin_unlock(&mddev
->lock
);
6355 * set_array_info is used two different ways
6356 * The original usage is when creating a new array.
6357 * In this usage, raid_disks is > 0 and it together with
6358 * level, size, not_persistent,layout,chunksize determine the
6359 * shape of the array.
6360 * This will always create an array with a type-0.90.0 superblock.
6361 * The newer usage is when assembling an array.
6362 * In this case raid_disks will be 0, and the major_version field is
6363 * use to determine which style super-blocks are to be found on the devices.
6364 * The minor and patch _version numbers are also kept incase the
6365 * super_block handler wishes to interpret them.
6367 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6370 if (info
->raid_disks
== 0) {
6371 /* just setting version number for superblock loading */
6372 if (info
->major_version
< 0 ||
6373 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6374 super_types
[info
->major_version
].name
== NULL
) {
6375 /* maybe try to auto-load a module? */
6377 "md: superblock version %d not known\n",
6378 info
->major_version
);
6381 mddev
->major_version
= info
->major_version
;
6382 mddev
->minor_version
= info
->minor_version
;
6383 mddev
->patch_version
= info
->patch_version
;
6384 mddev
->persistent
= !info
->not_persistent
;
6385 /* ensure mddev_put doesn't delete this now that there
6386 * is some minimal configuration.
6388 mddev
->ctime
= ktime_get_real_seconds();
6391 mddev
->major_version
= MD_MAJOR_VERSION
;
6392 mddev
->minor_version
= MD_MINOR_VERSION
;
6393 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6394 mddev
->ctime
= ktime_get_real_seconds();
6396 mddev
->level
= info
->level
;
6397 mddev
->clevel
[0] = 0;
6398 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6399 mddev
->raid_disks
= info
->raid_disks
;
6400 /* don't set md_minor, it is determined by which /dev/md* was
6403 if (info
->state
& (1<<MD_SB_CLEAN
))
6404 mddev
->recovery_cp
= MaxSector
;
6406 mddev
->recovery_cp
= 0;
6407 mddev
->persistent
= ! info
->not_persistent
;
6408 mddev
->external
= 0;
6410 mddev
->layout
= info
->layout
;
6411 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6413 mddev
->max_disks
= MD_SB_DISKS
;
6415 if (mddev
->persistent
)
6417 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6419 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6420 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6421 mddev
->bitmap_info
.offset
= 0;
6423 mddev
->reshape_position
= MaxSector
;
6426 * Generate a 128 bit UUID
6428 get_random_bytes(mddev
->uuid
, 16);
6430 mddev
->new_level
= mddev
->level
;
6431 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6432 mddev
->new_layout
= mddev
->layout
;
6433 mddev
->delta_disks
= 0;
6434 mddev
->reshape_backwards
= 0;
6439 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6441 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6443 if (mddev
->external_size
)
6446 mddev
->array_sectors
= array_sectors
;
6448 EXPORT_SYMBOL(md_set_array_sectors
);
6450 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6452 struct md_rdev
*rdev
;
6454 int fit
= (num_sectors
== 0);
6456 /* cluster raid doesn't support update size */
6457 if (mddev_is_clustered(mddev
))
6460 if (mddev
->pers
->resize
== NULL
)
6462 /* The "num_sectors" is the number of sectors of each device that
6463 * is used. This can only make sense for arrays with redundancy.
6464 * linear and raid0 always use whatever space is available. We can only
6465 * consider changing this number if no resync or reconstruction is
6466 * happening, and if the new size is acceptable. It must fit before the
6467 * sb_start or, if that is <data_offset, it must fit before the size
6468 * of each device. If num_sectors is zero, we find the largest size
6471 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6477 rdev_for_each(rdev
, mddev
) {
6478 sector_t avail
= rdev
->sectors
;
6480 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6481 num_sectors
= avail
;
6482 if (avail
< num_sectors
)
6485 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6487 revalidate_disk(mddev
->gendisk
);
6491 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6494 struct md_rdev
*rdev
;
6495 /* change the number of raid disks */
6496 if (mddev
->pers
->check_reshape
== NULL
)
6500 if (raid_disks
<= 0 ||
6501 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6503 if (mddev
->sync_thread
||
6504 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
6505 mddev
->reshape_position
!= MaxSector
)
6508 rdev_for_each(rdev
, mddev
) {
6509 if (mddev
->raid_disks
< raid_disks
&&
6510 rdev
->data_offset
< rdev
->new_data_offset
)
6512 if (mddev
->raid_disks
> raid_disks
&&
6513 rdev
->data_offset
> rdev
->new_data_offset
)
6517 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6518 if (mddev
->delta_disks
< 0)
6519 mddev
->reshape_backwards
= 1;
6520 else if (mddev
->delta_disks
> 0)
6521 mddev
->reshape_backwards
= 0;
6523 rv
= mddev
->pers
->check_reshape(mddev
);
6525 mddev
->delta_disks
= 0;
6526 mddev
->reshape_backwards
= 0;
6532 * update_array_info is used to change the configuration of an
6534 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6535 * fields in the info are checked against the array.
6536 * Any differences that cannot be handled will cause an error.
6537 * Normally, only one change can be managed at a time.
6539 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6545 /* calculate expected state,ignoring low bits */
6546 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6547 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6549 if (mddev
->major_version
!= info
->major_version
||
6550 mddev
->minor_version
!= info
->minor_version
||
6551 /* mddev->patch_version != info->patch_version || */
6552 mddev
->ctime
!= info
->ctime
||
6553 mddev
->level
!= info
->level
||
6554 /* mddev->layout != info->layout || */
6555 mddev
->persistent
!= !info
->not_persistent
||
6556 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6557 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6558 ((state
^info
->state
) & 0xfffffe00)
6561 /* Check there is only one change */
6562 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6564 if (mddev
->raid_disks
!= info
->raid_disks
)
6566 if (mddev
->layout
!= info
->layout
)
6568 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6575 if (mddev
->layout
!= info
->layout
) {
6577 * we don't need to do anything at the md level, the
6578 * personality will take care of it all.
6580 if (mddev
->pers
->check_reshape
== NULL
)
6583 mddev
->new_layout
= info
->layout
;
6584 rv
= mddev
->pers
->check_reshape(mddev
);
6586 mddev
->new_layout
= mddev
->layout
;
6590 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6591 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6593 if (mddev
->raid_disks
!= info
->raid_disks
)
6594 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6596 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6597 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
) {
6601 if (mddev
->recovery
|| mddev
->sync_thread
) {
6605 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6606 struct bitmap
*bitmap
;
6607 /* add the bitmap */
6608 if (mddev
->bitmap
) {
6612 if (mddev
->bitmap_info
.default_offset
== 0) {
6616 mddev
->bitmap_info
.offset
=
6617 mddev
->bitmap_info
.default_offset
;
6618 mddev
->bitmap_info
.space
=
6619 mddev
->bitmap_info
.default_space
;
6620 mddev
->pers
->quiesce(mddev
, 1);
6621 bitmap
= bitmap_create(mddev
, -1);
6622 if (!IS_ERR(bitmap
)) {
6623 mddev
->bitmap
= bitmap
;
6624 rv
= bitmap_load(mddev
);
6626 rv
= PTR_ERR(bitmap
);
6628 bitmap_destroy(mddev
);
6629 mddev
->pers
->quiesce(mddev
, 0);
6631 /* remove the bitmap */
6632 if (!mddev
->bitmap
) {
6636 if (mddev
->bitmap
->storage
.file
) {
6640 if (mddev
->bitmap_info
.nodes
) {
6641 /* hold PW on all the bitmap lock */
6642 if (md_cluster_ops
->lock_all_bitmaps(mddev
) <= 0) {
6643 printk("md: can't change bitmap to none since the"
6644 " array is in use by more than one node\n");
6646 md_cluster_ops
->unlock_all_bitmaps(mddev
);
6650 mddev
->bitmap_info
.nodes
= 0;
6651 md_cluster_ops
->leave(mddev
);
6653 mddev
->pers
->quiesce(mddev
, 1);
6654 bitmap_destroy(mddev
);
6655 mddev
->pers
->quiesce(mddev
, 0);
6656 mddev
->bitmap_info
.offset
= 0;
6659 md_update_sb(mddev
, 1);
6665 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6667 struct md_rdev
*rdev
;
6670 if (mddev
->pers
== NULL
)
6674 rdev
= find_rdev_rcu(mddev
, dev
);
6678 md_error(mddev
, rdev
);
6679 if (!test_bit(Faulty
, &rdev
->flags
))
6687 * We have a problem here : there is no easy way to give a CHS
6688 * virtual geometry. We currently pretend that we have a 2 heads
6689 * 4 sectors (with a BIG number of cylinders...). This drives
6690 * dosfs just mad... ;-)
6692 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6694 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6698 geo
->cylinders
= mddev
->array_sectors
/ 8;
6702 static inline bool md_ioctl_valid(unsigned int cmd
)
6707 case GET_ARRAY_INFO
:
6708 case GET_BITMAP_FILE
:
6711 case HOT_REMOVE_DISK
:
6714 case RESTART_ARRAY_RW
:
6716 case SET_ARRAY_INFO
:
6717 case SET_BITMAP_FILE
:
6718 case SET_DISK_FAULTY
:
6721 case CLUSTERED_DISK_NACK
:
6728 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6729 unsigned int cmd
, unsigned long arg
)
6732 void __user
*argp
= (void __user
*)arg
;
6733 struct mddev
*mddev
= NULL
;
6736 if (!md_ioctl_valid(cmd
))
6741 case GET_ARRAY_INFO
:
6745 if (!capable(CAP_SYS_ADMIN
))
6750 * Commands dealing with the RAID driver but not any
6755 err
= get_version(argp
);
6761 autostart_arrays(arg
);
6768 * Commands creating/starting a new array:
6771 mddev
= bdev
->bd_disk
->private_data
;
6778 /* Some actions do not requires the mutex */
6780 case GET_ARRAY_INFO
:
6781 if (!mddev
->raid_disks
&& !mddev
->external
)
6784 err
= get_array_info(mddev
, argp
);
6788 if (!mddev
->raid_disks
&& !mddev
->external
)
6791 err
= get_disk_info(mddev
, argp
);
6794 case SET_DISK_FAULTY
:
6795 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6798 case GET_BITMAP_FILE
:
6799 err
= get_bitmap_file(mddev
, argp
);
6804 if (cmd
== ADD_NEW_DISK
)
6805 /* need to ensure md_delayed_delete() has completed */
6806 flush_workqueue(md_misc_wq
);
6808 if (cmd
== HOT_REMOVE_DISK
)
6809 /* need to ensure recovery thread has run */
6810 wait_event_interruptible_timeout(mddev
->sb_wait
,
6811 !test_bit(MD_RECOVERY_NEEDED
,
6813 msecs_to_jiffies(5000));
6814 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6815 /* Need to flush page cache, and ensure no-one else opens
6818 mutex_lock(&mddev
->open_mutex
);
6819 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6820 mutex_unlock(&mddev
->open_mutex
);
6824 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6825 mutex_unlock(&mddev
->open_mutex
);
6826 sync_blockdev(bdev
);
6828 err
= mddev_lock(mddev
);
6831 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6836 if (cmd
== SET_ARRAY_INFO
) {
6837 mdu_array_info_t info
;
6839 memset(&info
, 0, sizeof(info
));
6840 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6845 err
= update_array_info(mddev
, &info
);
6847 printk(KERN_WARNING
"md: couldn't update"
6848 " array info. %d\n", err
);
6853 if (!list_empty(&mddev
->disks
)) {
6855 "md: array %s already has disks!\n",
6860 if (mddev
->raid_disks
) {
6862 "md: array %s already initialised!\n",
6867 err
= set_array_info(mddev
, &info
);
6869 printk(KERN_WARNING
"md: couldn't set"
6870 " array info. %d\n", err
);
6877 * Commands querying/configuring an existing array:
6879 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6880 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6881 if ((!mddev
->raid_disks
&& !mddev
->external
)
6882 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6883 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6884 && cmd
!= GET_BITMAP_FILE
) {
6890 * Commands even a read-only array can execute:
6893 case RESTART_ARRAY_RW
:
6894 err
= restart_array(mddev
);
6898 err
= do_md_stop(mddev
, 0, bdev
);
6902 err
= md_set_readonly(mddev
, bdev
);
6905 case HOT_REMOVE_DISK
:
6906 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6910 /* We can support ADD_NEW_DISK on read-only arrays
6911 * only if we are re-adding a preexisting device.
6912 * So require mddev->pers and MD_DISK_SYNC.
6915 mdu_disk_info_t info
;
6916 if (copy_from_user(&info
, argp
, sizeof(info
)))
6918 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6919 /* Need to clear read-only for this */
6922 err
= add_new_disk(mddev
, &info
);
6928 if (get_user(ro
, (int __user
*)(arg
))) {
6934 /* if the bdev is going readonly the value of mddev->ro
6935 * does not matter, no writes are coming
6940 /* are we are already prepared for writes? */
6944 /* transitioning to readauto need only happen for
6945 * arrays that call md_write_start
6948 err
= restart_array(mddev
);
6951 set_disk_ro(mddev
->gendisk
, 0);
6958 * The remaining ioctls are changing the state of the
6959 * superblock, so we do not allow them on read-only arrays.
6961 if (mddev
->ro
&& mddev
->pers
) {
6962 if (mddev
->ro
== 2) {
6964 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6965 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6966 /* mddev_unlock will wake thread */
6967 /* If a device failed while we were read-only, we
6968 * need to make sure the metadata is updated now.
6970 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6971 mddev_unlock(mddev
);
6972 wait_event(mddev
->sb_wait
,
6973 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6974 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6975 mddev_lock_nointr(mddev
);
6986 mdu_disk_info_t info
;
6987 if (copy_from_user(&info
, argp
, sizeof(info
)))
6990 err
= add_new_disk(mddev
, &info
);
6994 case CLUSTERED_DISK_NACK
:
6995 if (mddev_is_clustered(mddev
))
6996 md_cluster_ops
->new_disk_ack(mddev
, false);
7002 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
7006 err
= do_md_run(mddev
);
7009 case SET_BITMAP_FILE
:
7010 err
= set_bitmap_file(mddev
, (int)arg
);
7019 if (mddev
->hold_active
== UNTIL_IOCTL
&&
7021 mddev
->hold_active
= 0;
7022 mddev_unlock(mddev
);
7026 #ifdef CONFIG_COMPAT
7027 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
7028 unsigned int cmd
, unsigned long arg
)
7031 case HOT_REMOVE_DISK
:
7033 case SET_DISK_FAULTY
:
7034 case SET_BITMAP_FILE
:
7035 /* These take in integer arg, do not convert */
7038 arg
= (unsigned long)compat_ptr(arg
);
7042 return md_ioctl(bdev
, mode
, cmd
, arg
);
7044 #endif /* CONFIG_COMPAT */
7046 static int md_open(struct block_device
*bdev
, fmode_t mode
)
7049 * Succeed if we can lock the mddev, which confirms that
7050 * it isn't being stopped right now.
7052 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
7058 if (mddev
->gendisk
!= bdev
->bd_disk
) {
7059 /* we are racing with mddev_put which is discarding this
7063 /* Wait until bdev->bd_disk is definitely gone */
7064 flush_workqueue(md_misc_wq
);
7065 /* Then retry the open from the top */
7066 return -ERESTARTSYS
;
7068 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
7070 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
7074 atomic_inc(&mddev
->openers
);
7075 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
7076 mutex_unlock(&mddev
->open_mutex
);
7078 check_disk_change(bdev
);
7083 static void md_release(struct gendisk
*disk
, fmode_t mode
)
7085 struct mddev
*mddev
= disk
->private_data
;
7088 atomic_dec(&mddev
->openers
);
7092 static int md_media_changed(struct gendisk
*disk
)
7094 struct mddev
*mddev
= disk
->private_data
;
7096 return mddev
->changed
;
7099 static int md_revalidate(struct gendisk
*disk
)
7101 struct mddev
*mddev
= disk
->private_data
;
7106 static const struct block_device_operations md_fops
=
7108 .owner
= THIS_MODULE
,
7110 .release
= md_release
,
7112 #ifdef CONFIG_COMPAT
7113 .compat_ioctl
= md_compat_ioctl
,
7115 .getgeo
= md_getgeo
,
7116 .media_changed
= md_media_changed
,
7117 .revalidate_disk
= md_revalidate
,
7120 static int md_thread(void *arg
)
7122 struct md_thread
*thread
= arg
;
7125 * md_thread is a 'system-thread', it's priority should be very
7126 * high. We avoid resource deadlocks individually in each
7127 * raid personality. (RAID5 does preallocation) We also use RR and
7128 * the very same RT priority as kswapd, thus we will never get
7129 * into a priority inversion deadlock.
7131 * we definitely have to have equal or higher priority than
7132 * bdflush, otherwise bdflush will deadlock if there are too
7133 * many dirty RAID5 blocks.
7136 allow_signal(SIGKILL
);
7137 while (!kthread_should_stop()) {
7139 /* We need to wait INTERRUPTIBLE so that
7140 * we don't add to the load-average.
7141 * That means we need to be sure no signals are
7144 if (signal_pending(current
))
7145 flush_signals(current
);
7147 wait_event_interruptible_timeout
7149 test_bit(THREAD_WAKEUP
, &thread
->flags
)
7150 || kthread_should_stop(),
7153 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
7154 if (!kthread_should_stop())
7155 thread
->run(thread
);
7161 void md_wakeup_thread(struct md_thread
*thread
)
7164 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
7165 set_bit(THREAD_WAKEUP
, &thread
->flags
);
7166 wake_up(&thread
->wqueue
);
7169 EXPORT_SYMBOL(md_wakeup_thread
);
7171 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
7172 struct mddev
*mddev
, const char *name
)
7174 struct md_thread
*thread
;
7176 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
7180 init_waitqueue_head(&thread
->wqueue
);
7183 thread
->mddev
= mddev
;
7184 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
7185 thread
->tsk
= kthread_run(md_thread
, thread
,
7187 mdname(thread
->mddev
),
7189 if (IS_ERR(thread
->tsk
)) {
7195 EXPORT_SYMBOL(md_register_thread
);
7197 void md_unregister_thread(struct md_thread
**threadp
)
7199 struct md_thread
*thread
= *threadp
;
7202 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
7203 /* Locking ensures that mddev_unlock does not wake_up a
7204 * non-existent thread
7206 spin_lock(&pers_lock
);
7208 spin_unlock(&pers_lock
);
7210 kthread_stop(thread
->tsk
);
7213 EXPORT_SYMBOL(md_unregister_thread
);
7215 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
7217 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
7220 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
7222 mddev
->pers
->error_handler(mddev
,rdev
);
7223 if (mddev
->degraded
)
7224 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7225 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7226 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7227 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7228 md_wakeup_thread(mddev
->thread
);
7229 if (mddev
->event_work
.func
)
7230 queue_work(md_misc_wq
, &mddev
->event_work
);
7231 md_new_event(mddev
);
7233 EXPORT_SYMBOL(md_error
);
7235 /* seq_file implementation /proc/mdstat */
7237 static void status_unused(struct seq_file
*seq
)
7240 struct md_rdev
*rdev
;
7242 seq_printf(seq
, "unused devices: ");
7244 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
7245 char b
[BDEVNAME_SIZE
];
7247 seq_printf(seq
, "%s ",
7248 bdevname(rdev
->bdev
,b
));
7251 seq_printf(seq
, "<none>");
7253 seq_printf(seq
, "\n");
7256 static int status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
7258 sector_t max_sectors
, resync
, res
;
7259 unsigned long dt
, db
;
7262 unsigned int per_milli
;
7264 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7265 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7266 max_sectors
= mddev
->resync_max_sectors
;
7268 max_sectors
= mddev
->dev_sectors
;
7270 resync
= mddev
->curr_resync
;
7272 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7273 /* Still cleaning up */
7274 resync
= max_sectors
;
7276 resync
-= atomic_read(&mddev
->recovery_active
);
7279 if (mddev
->recovery_cp
< MaxSector
) {
7280 seq_printf(seq
, "\tresync=PENDING");
7286 seq_printf(seq
, "\tresync=DELAYED");
7290 WARN_ON(max_sectors
== 0);
7291 /* Pick 'scale' such that (resync>>scale)*1000 will fit
7292 * in a sector_t, and (max_sectors>>scale) will fit in a
7293 * u32, as those are the requirements for sector_div.
7294 * Thus 'scale' must be at least 10
7297 if (sizeof(sector_t
) > sizeof(unsigned long)) {
7298 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
7301 res
= (resync
>>scale
)*1000;
7302 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
7306 int i
, x
= per_milli
/50, y
= 20-x
;
7307 seq_printf(seq
, "[");
7308 for (i
= 0; i
< x
; i
++)
7309 seq_printf(seq
, "=");
7310 seq_printf(seq
, ">");
7311 for (i
= 0; i
< y
; i
++)
7312 seq_printf(seq
, ".");
7313 seq_printf(seq
, "] ");
7315 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
7316 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
7318 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
7320 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
7321 "resync" : "recovery"))),
7322 per_milli
/10, per_milli
% 10,
7323 (unsigned long long) resync
/2,
7324 (unsigned long long) max_sectors
/2);
7327 * dt: time from mark until now
7328 * db: blocks written from mark until now
7329 * rt: remaining time
7331 * rt is a sector_t, so could be 32bit or 64bit.
7332 * So we divide before multiply in case it is 32bit and close
7334 * We scale the divisor (db) by 32 to avoid losing precision
7335 * near the end of resync when the number of remaining sectors
7337 * We then divide rt by 32 after multiplying by db to compensate.
7338 * The '+1' avoids division by zero if db is very small.
7340 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
7342 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
7343 - mddev
->resync_mark_cnt
;
7345 rt
= max_sectors
- resync
; /* number of remaining sectors */
7346 sector_div(rt
, db
/32+1);
7350 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
7351 ((unsigned long)rt
% 60)/6);
7353 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7357 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7359 struct list_head
*tmp
;
7361 struct mddev
*mddev
;
7369 spin_lock(&all_mddevs_lock
);
7370 list_for_each(tmp
,&all_mddevs
)
7372 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7374 spin_unlock(&all_mddevs_lock
);
7377 spin_unlock(&all_mddevs_lock
);
7379 return (void*)2;/* tail */
7383 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7385 struct list_head
*tmp
;
7386 struct mddev
*next_mddev
, *mddev
= v
;
7392 spin_lock(&all_mddevs_lock
);
7394 tmp
= all_mddevs
.next
;
7396 tmp
= mddev
->all_mddevs
.next
;
7397 if (tmp
!= &all_mddevs
)
7398 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7400 next_mddev
= (void*)2;
7403 spin_unlock(&all_mddevs_lock
);
7411 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7413 struct mddev
*mddev
= v
;
7415 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7419 static int md_seq_show(struct seq_file
*seq
, void *v
)
7421 struct mddev
*mddev
= v
;
7423 struct md_rdev
*rdev
;
7425 if (v
== (void*)1) {
7426 struct md_personality
*pers
;
7427 seq_printf(seq
, "Personalities : ");
7428 spin_lock(&pers_lock
);
7429 list_for_each_entry(pers
, &pers_list
, list
)
7430 seq_printf(seq
, "[%s] ", pers
->name
);
7432 spin_unlock(&pers_lock
);
7433 seq_printf(seq
, "\n");
7434 seq
->poll_event
= atomic_read(&md_event_count
);
7437 if (v
== (void*)2) {
7442 spin_lock(&mddev
->lock
);
7443 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7444 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7445 mddev
->pers
? "" : "in");
7448 seq_printf(seq
, " (read-only)");
7450 seq_printf(seq
, " (auto-read-only)");
7451 seq_printf(seq
, " %s", mddev
->pers
->name
);
7456 rdev_for_each_rcu(rdev
, mddev
) {
7457 char b
[BDEVNAME_SIZE
];
7458 seq_printf(seq
, " %s[%d]",
7459 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7460 if (test_bit(WriteMostly
, &rdev
->flags
))
7461 seq_printf(seq
, "(W)");
7462 if (test_bit(Journal
, &rdev
->flags
))
7463 seq_printf(seq
, "(J)");
7464 if (test_bit(Faulty
, &rdev
->flags
)) {
7465 seq_printf(seq
, "(F)");
7468 if (rdev
->raid_disk
< 0)
7469 seq_printf(seq
, "(S)"); /* spare */
7470 if (test_bit(Replacement
, &rdev
->flags
))
7471 seq_printf(seq
, "(R)");
7472 sectors
+= rdev
->sectors
;
7476 if (!list_empty(&mddev
->disks
)) {
7478 seq_printf(seq
, "\n %llu blocks",
7479 (unsigned long long)
7480 mddev
->array_sectors
/ 2);
7482 seq_printf(seq
, "\n %llu blocks",
7483 (unsigned long long)sectors
/ 2);
7485 if (mddev
->persistent
) {
7486 if (mddev
->major_version
!= 0 ||
7487 mddev
->minor_version
!= 90) {
7488 seq_printf(seq
," super %d.%d",
7489 mddev
->major_version
,
7490 mddev
->minor_version
);
7492 } else if (mddev
->external
)
7493 seq_printf(seq
, " super external:%s",
7494 mddev
->metadata_type
);
7496 seq_printf(seq
, " super non-persistent");
7499 mddev
->pers
->status(seq
, mddev
);
7500 seq_printf(seq
, "\n ");
7501 if (mddev
->pers
->sync_request
) {
7502 if (status_resync(seq
, mddev
))
7503 seq_printf(seq
, "\n ");
7506 seq_printf(seq
, "\n ");
7508 bitmap_status(seq
, mddev
->bitmap
);
7510 seq_printf(seq
, "\n");
7512 spin_unlock(&mddev
->lock
);
7517 static const struct seq_operations md_seq_ops
= {
7518 .start
= md_seq_start
,
7519 .next
= md_seq_next
,
7520 .stop
= md_seq_stop
,
7521 .show
= md_seq_show
,
7524 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7526 struct seq_file
*seq
;
7529 error
= seq_open(file
, &md_seq_ops
);
7533 seq
= file
->private_data
;
7534 seq
->poll_event
= atomic_read(&md_event_count
);
7538 static int md_unloading
;
7539 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7541 struct seq_file
*seq
= filp
->private_data
;
7545 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;
7546 poll_wait(filp
, &md_event_waiters
, wait
);
7548 /* always allow read */
7549 mask
= POLLIN
| POLLRDNORM
;
7551 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7552 mask
|= POLLERR
| POLLPRI
;
7556 static const struct file_operations md_seq_fops
= {
7557 .owner
= THIS_MODULE
,
7558 .open
= md_seq_open
,
7560 .llseek
= seq_lseek
,
7561 .release
= seq_release_private
,
7562 .poll
= mdstat_poll
,
7565 int register_md_personality(struct md_personality
*p
)
7567 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7569 spin_lock(&pers_lock
);
7570 list_add_tail(&p
->list
, &pers_list
);
7571 spin_unlock(&pers_lock
);
7574 EXPORT_SYMBOL(register_md_personality
);
7576 int unregister_md_personality(struct md_personality
*p
)
7578 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7579 spin_lock(&pers_lock
);
7580 list_del_init(&p
->list
);
7581 spin_unlock(&pers_lock
);
7584 EXPORT_SYMBOL(unregister_md_personality
);
7586 int register_md_cluster_operations(struct md_cluster_operations
*ops
,
7587 struct module
*module
)
7590 spin_lock(&pers_lock
);
7591 if (md_cluster_ops
!= NULL
)
7594 md_cluster_ops
= ops
;
7595 md_cluster_mod
= module
;
7597 spin_unlock(&pers_lock
);
7600 EXPORT_SYMBOL(register_md_cluster_operations
);
7602 int unregister_md_cluster_operations(void)
7604 spin_lock(&pers_lock
);
7605 md_cluster_ops
= NULL
;
7606 spin_unlock(&pers_lock
);
7609 EXPORT_SYMBOL(unregister_md_cluster_operations
);
7611 int md_setup_cluster(struct mddev
*mddev
, int nodes
)
7615 err
= request_module("md-cluster");
7617 pr_err("md-cluster module not found.\n");
7621 spin_lock(&pers_lock
);
7622 if (!md_cluster_ops
|| !try_module_get(md_cluster_mod
)) {
7623 spin_unlock(&pers_lock
);
7626 spin_unlock(&pers_lock
);
7628 return md_cluster_ops
->join(mddev
, nodes
);
7631 void md_cluster_stop(struct mddev
*mddev
)
7633 if (!md_cluster_ops
)
7635 md_cluster_ops
->leave(mddev
);
7636 module_put(md_cluster_mod
);
7639 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7641 struct md_rdev
*rdev
;
7647 rdev_for_each_rcu(rdev
, mddev
) {
7648 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7649 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7650 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7651 atomic_read(&disk
->sync_io
);
7652 /* sync IO will cause sync_io to increase before the disk_stats
7653 * as sync_io is counted when a request starts, and
7654 * disk_stats is counted when it completes.
7655 * So resync activity will cause curr_events to be smaller than
7656 * when there was no such activity.
7657 * non-sync IO will cause disk_stat to increase without
7658 * increasing sync_io so curr_events will (eventually)
7659 * be larger than it was before. Once it becomes
7660 * substantially larger, the test below will cause
7661 * the array to appear non-idle, and resync will slow
7663 * If there is a lot of outstanding resync activity when
7664 * we set last_event to curr_events, then all that activity
7665 * completing might cause the array to appear non-idle
7666 * and resync will be slowed down even though there might
7667 * not have been non-resync activity. This will only
7668 * happen once though. 'last_events' will soon reflect
7669 * the state where there is little or no outstanding
7670 * resync requests, and further resync activity will
7671 * always make curr_events less than last_events.
7674 if (init
|| curr_events
- rdev
->last_events
> 64) {
7675 rdev
->last_events
= curr_events
;
7683 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7685 /* another "blocks" (512byte) blocks have been synced */
7686 atomic_sub(blocks
, &mddev
->recovery_active
);
7687 wake_up(&mddev
->recovery_wait
);
7689 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7690 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7691 md_wakeup_thread(mddev
->thread
);
7692 // stop recovery, signal do_sync ....
7695 EXPORT_SYMBOL(md_done_sync
);
7697 /* md_write_start(mddev, bi)
7698 * If we need to update some array metadata (e.g. 'active' flag
7699 * in superblock) before writing, schedule a superblock update
7700 * and wait for it to complete.
7702 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7705 if (bio_data_dir(bi
) != WRITE
)
7708 BUG_ON(mddev
->ro
== 1);
7709 if (mddev
->ro
== 2) {
7710 /* need to switch to read/write */
7712 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7713 md_wakeup_thread(mddev
->thread
);
7714 md_wakeup_thread(mddev
->sync_thread
);
7717 atomic_inc(&mddev
->writes_pending
);
7718 if (mddev
->safemode
== 1)
7719 mddev
->safemode
= 0;
7720 if (mddev
->in_sync
) {
7721 spin_lock(&mddev
->lock
);
7722 if (mddev
->in_sync
) {
7724 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7725 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7726 md_wakeup_thread(mddev
->thread
);
7729 spin_unlock(&mddev
->lock
);
7732 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7733 wait_event(mddev
->sb_wait
,
7734 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7736 EXPORT_SYMBOL(md_write_start
);
7738 void md_write_end(struct mddev
*mddev
)
7740 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7741 if (mddev
->safemode
== 2)
7742 md_wakeup_thread(mddev
->thread
);
7743 else if (mddev
->safemode_delay
)
7744 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7747 EXPORT_SYMBOL(md_write_end
);
7749 /* md_allow_write(mddev)
7750 * Calling this ensures that the array is marked 'active' so that writes
7751 * may proceed without blocking. It is important to call this before
7752 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7753 * Must be called with mddev_lock held.
7755 * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock
7756 * is dropped, so return -EAGAIN after notifying userspace.
7758 int md_allow_write(struct mddev
*mddev
)
7764 if (!mddev
->pers
->sync_request
)
7767 spin_lock(&mddev
->lock
);
7768 if (mddev
->in_sync
) {
7770 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7771 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7772 if (mddev
->safemode_delay
&&
7773 mddev
->safemode
== 0)
7774 mddev
->safemode
= 1;
7775 spin_unlock(&mddev
->lock
);
7776 md_update_sb(mddev
, 0);
7777 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7779 spin_unlock(&mddev
->lock
);
7781 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7786 EXPORT_SYMBOL_GPL(md_allow_write
);
7788 #define SYNC_MARKS 10
7789 #define SYNC_MARK_STEP (3*HZ)
7790 #define UPDATE_FREQUENCY (5*60*HZ)
7791 void md_do_sync(struct md_thread
*thread
)
7793 struct mddev
*mddev
= thread
->mddev
;
7794 struct mddev
*mddev2
;
7795 unsigned int currspeed
= 0,
7797 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7798 unsigned long mark
[SYNC_MARKS
];
7799 unsigned long update_time
;
7800 sector_t mark_cnt
[SYNC_MARKS
];
7802 struct list_head
*tmp
;
7803 sector_t last_check
;
7805 struct md_rdev
*rdev
;
7806 char *desc
, *action
= NULL
;
7807 struct blk_plug plug
;
7810 /* just incase thread restarts... */
7811 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7813 if (mddev
->ro
) {/* never try to sync a read-only array */
7814 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7818 if (mddev_is_clustered(mddev
)) {
7819 ret
= md_cluster_ops
->resync_start(mddev
);
7823 set_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
);
7824 if (!(test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
7825 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
7826 test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
7827 && ((unsigned long long)mddev
->curr_resync_completed
7828 < (unsigned long long)mddev
->resync_max_sectors
))
7832 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7833 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7834 desc
= "data-check";
7836 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7837 desc
= "requested-resync";
7841 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7846 mddev
->last_sync_action
= action
?: desc
;
7848 /* we overload curr_resync somewhat here.
7849 * 0 == not engaged in resync at all
7850 * 2 == checking that there is no conflict with another sync
7851 * 1 == like 2, but have yielded to allow conflicting resync to
7853 * other == active in resync - this many blocks
7855 * Before starting a resync we must have set curr_resync to
7856 * 2, and then checked that every "conflicting" array has curr_resync
7857 * less than ours. When we find one that is the same or higher
7858 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7859 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7860 * This will mean we have to start checking from the beginning again.
7865 mddev
->curr_resync
= 2;
7868 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7870 for_each_mddev(mddev2
, tmp
) {
7871 if (mddev2
== mddev
)
7873 if (!mddev
->parallel_resync
7874 && mddev2
->curr_resync
7875 && match_mddev_units(mddev
, mddev2
)) {
7877 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7878 /* arbitrarily yield */
7879 mddev
->curr_resync
= 1;
7880 wake_up(&resync_wait
);
7882 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7883 /* no need to wait here, we can wait the next
7884 * time 'round when curr_resync == 2
7887 /* We need to wait 'interruptible' so as not to
7888 * contribute to the load average, and not to
7889 * be caught by 'softlockup'
7891 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7892 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7893 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7894 printk(KERN_INFO
"md: delaying %s of %s"
7895 " until %s has finished (they"
7896 " share one or more physical units)\n",
7897 desc
, mdname(mddev
), mdname(mddev2
));
7899 if (signal_pending(current
))
7900 flush_signals(current
);
7902 finish_wait(&resync_wait
, &wq
);
7905 finish_wait(&resync_wait
, &wq
);
7908 } while (mddev
->curr_resync
< 2);
7911 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7912 /* resync follows the size requested by the personality,
7913 * which defaults to physical size, but can be virtual size
7915 max_sectors
= mddev
->resync_max_sectors
;
7916 atomic64_set(&mddev
->resync_mismatches
, 0);
7917 /* we don't use the checkpoint if there's a bitmap */
7918 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7919 j
= mddev
->resync_min
;
7920 else if (!mddev
->bitmap
)
7921 j
= mddev
->recovery_cp
;
7923 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7924 max_sectors
= mddev
->resync_max_sectors
;
7926 /* recovery follows the physical size of devices */
7927 max_sectors
= mddev
->dev_sectors
;
7930 rdev_for_each_rcu(rdev
, mddev
)
7931 if (rdev
->raid_disk
>= 0 &&
7932 !test_bit(Journal
, &rdev
->flags
) &&
7933 !test_bit(Faulty
, &rdev
->flags
) &&
7934 !test_bit(In_sync
, &rdev
->flags
) &&
7935 rdev
->recovery_offset
< j
)
7936 j
= rdev
->recovery_offset
;
7939 /* If there is a bitmap, we need to make sure all
7940 * writes that started before we added a spare
7941 * complete before we start doing a recovery.
7942 * Otherwise the write might complete and (via
7943 * bitmap_endwrite) set a bit in the bitmap after the
7944 * recovery has checked that bit and skipped that
7947 if (mddev
->bitmap
) {
7948 mddev
->pers
->quiesce(mddev
, 1);
7949 mddev
->pers
->quiesce(mddev
, 0);
7953 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7954 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7955 " %d KB/sec/disk.\n", speed_min(mddev
));
7956 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7957 "(but not more than %d KB/sec) for %s.\n",
7958 speed_max(mddev
), desc
);
7960 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7963 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7965 mark_cnt
[m
] = io_sectors
;
7968 mddev
->resync_mark
= mark
[last_mark
];
7969 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7972 * Tune reconstruction:
7974 window
= 32*(PAGE_SIZE
/512);
7975 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7976 window
/2, (unsigned long long)max_sectors
/2);
7978 atomic_set(&mddev
->recovery_active
, 0);
7983 "md: resuming %s of %s from checkpoint.\n",
7984 desc
, mdname(mddev
));
7985 mddev
->curr_resync
= j
;
7987 mddev
->curr_resync
= 3; /* no longer delayed */
7988 mddev
->curr_resync_completed
= j
;
7989 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7990 md_new_event(mddev
);
7991 update_time
= jiffies
;
7993 blk_start_plug(&plug
);
7994 while (j
< max_sectors
) {
7999 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8000 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
8001 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
8002 > (max_sectors
>> 4)) ||
8003 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
8004 (j
- mddev
->curr_resync_completed
)*2
8005 >= mddev
->resync_max
- mddev
->curr_resync_completed
||
8006 mddev
->curr_resync_completed
> mddev
->resync_max
8008 /* time to update curr_resync_completed */
8009 wait_event(mddev
->recovery_wait
,
8010 atomic_read(&mddev
->recovery_active
) == 0);
8011 mddev
->curr_resync_completed
= j
;
8012 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
8013 j
> mddev
->recovery_cp
)
8014 mddev
->recovery_cp
= j
;
8015 update_time
= jiffies
;
8016 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8017 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8020 while (j
>= mddev
->resync_max
&&
8021 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8022 /* As this condition is controlled by user-space,
8023 * we can block indefinitely, so use '_interruptible'
8024 * to avoid triggering warnings.
8026 flush_signals(current
); /* just in case */
8027 wait_event_interruptible(mddev
->recovery_wait
,
8028 mddev
->resync_max
> j
8029 || test_bit(MD_RECOVERY_INTR
,
8033 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8036 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
);
8038 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8042 if (!skipped
) { /* actual IO requested */
8043 io_sectors
+= sectors
;
8044 atomic_add(sectors
, &mddev
->recovery_active
);
8047 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8051 if (j
> max_sectors
)
8052 /* when skipping, extra large numbers can be returned. */
8055 mddev
->curr_resync
= j
;
8056 mddev
->curr_mark_cnt
= io_sectors
;
8057 if (last_check
== 0)
8058 /* this is the earliest that rebuild will be
8059 * visible in /proc/mdstat
8061 md_new_event(mddev
);
8063 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
8066 last_check
= io_sectors
;
8068 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
8070 int next
= (last_mark
+1) % SYNC_MARKS
;
8072 mddev
->resync_mark
= mark
[next
];
8073 mddev
->resync_mark_cnt
= mark_cnt
[next
];
8074 mark
[next
] = jiffies
;
8075 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
8079 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8083 * this loop exits only if either when we are slower than
8084 * the 'hard' speed limit, or the system was IO-idle for
8086 * the system might be non-idle CPU-wise, but we only care
8087 * about not overloading the IO subsystem. (things like an
8088 * e2fsck being done on the RAID array should execute fast)
8092 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
8093 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
8094 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
8096 if (currspeed
> speed_min(mddev
)) {
8097 if (currspeed
> speed_max(mddev
)) {
8101 if (!is_mddev_idle(mddev
, 0)) {
8103 * Give other IO more of a chance.
8104 * The faster the devices, the less we wait.
8106 wait_event(mddev
->recovery_wait
,
8107 !atomic_read(&mddev
->recovery_active
));
8111 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
8112 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
8113 ? "interrupted" : "done");
8115 * this also signals 'finished resyncing' to md_stop
8117 blk_finish_plug(&plug
);
8118 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
8120 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8121 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8122 mddev
->curr_resync
> 2) {
8123 mddev
->curr_resync_completed
= mddev
->curr_resync
;
8124 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
8126 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
);
8128 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
8129 mddev
->curr_resync
> 2) {
8130 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
8131 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8132 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
8134 "md: checkpointing %s of %s.\n",
8135 desc
, mdname(mddev
));
8136 if (test_bit(MD_RECOVERY_ERROR
,
8138 mddev
->recovery_cp
=
8139 mddev
->curr_resync_completed
;
8141 mddev
->recovery_cp
=
8145 mddev
->recovery_cp
= MaxSector
;
8147 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
8148 mddev
->curr_resync
= MaxSector
;
8150 rdev_for_each_rcu(rdev
, mddev
)
8151 if (rdev
->raid_disk
>= 0 &&
8152 mddev
->delta_disks
>= 0 &&
8153 !test_bit(Journal
, &rdev
->flags
) &&
8154 !test_bit(Faulty
, &rdev
->flags
) &&
8155 !test_bit(In_sync
, &rdev
->flags
) &&
8156 rdev
->recovery_offset
< mddev
->curr_resync
)
8157 rdev
->recovery_offset
= mddev
->curr_resync
;
8162 /* set CHANGE_PENDING here since maybe another update is needed,
8163 * so other nodes are informed. It should be harmless for normal
8165 set_mask_bits(&mddev
->flags
, 0,
8166 BIT(MD_CHANGE_PENDING
) | BIT(MD_CHANGE_DEVS
));
8168 spin_lock(&mddev
->lock
);
8169 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
8170 /* We completed so min/max setting can be forgotten if used. */
8171 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8172 mddev
->resync_min
= 0;
8173 mddev
->resync_max
= MaxSector
;
8174 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
8175 mddev
->resync_min
= mddev
->curr_resync_completed
;
8176 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8177 mddev
->curr_resync
= 0;
8178 spin_unlock(&mddev
->lock
);
8180 wake_up(&resync_wait
);
8181 md_wakeup_thread(mddev
->thread
);
8184 EXPORT_SYMBOL_GPL(md_do_sync
);
8186 static int remove_and_add_spares(struct mddev
*mddev
,
8187 struct md_rdev
*this)
8189 struct md_rdev
*rdev
;
8192 bool remove_some
= false;
8194 rdev_for_each(rdev
, mddev
) {
8195 if ((this == NULL
|| rdev
== this) &&
8196 rdev
->raid_disk
>= 0 &&
8197 !test_bit(Blocked
, &rdev
->flags
) &&
8198 test_bit(Faulty
, &rdev
->flags
) &&
8199 atomic_read(&rdev
->nr_pending
)==0) {
8200 /* Faulty non-Blocked devices with nr_pending == 0
8201 * never get nr_pending incremented,
8202 * never get Faulty cleared, and never get Blocked set.
8203 * So we can synchronize_rcu now rather than once per device
8206 set_bit(RemoveSynchronized
, &rdev
->flags
);
8212 rdev_for_each(rdev
, mddev
) {
8213 if ((this == NULL
|| rdev
== this) &&
8214 rdev
->raid_disk
>= 0 &&
8215 !test_bit(Blocked
, &rdev
->flags
) &&
8216 ((test_bit(RemoveSynchronized
, &rdev
->flags
) ||
8217 (!test_bit(In_sync
, &rdev
->flags
) &&
8218 !test_bit(Journal
, &rdev
->flags
))) &&
8219 atomic_read(&rdev
->nr_pending
)==0)) {
8220 if (mddev
->pers
->hot_remove_disk(
8221 mddev
, rdev
) == 0) {
8222 sysfs_unlink_rdev(mddev
, rdev
);
8223 rdev
->raid_disk
= -1;
8227 if (remove_some
&& test_bit(RemoveSynchronized
, &rdev
->flags
))
8228 clear_bit(RemoveSynchronized
, &rdev
->flags
);
8231 if (removed
&& mddev
->kobj
.sd
)
8232 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8234 if (this && removed
)
8237 rdev_for_each(rdev
, mddev
) {
8238 if (this && this != rdev
)
8240 if (test_bit(Candidate
, &rdev
->flags
))
8242 if (rdev
->raid_disk
>= 0 &&
8243 !test_bit(In_sync
, &rdev
->flags
) &&
8244 !test_bit(Journal
, &rdev
->flags
) &&
8245 !test_bit(Faulty
, &rdev
->flags
))
8247 if (rdev
->raid_disk
>= 0)
8249 if (test_bit(Faulty
, &rdev
->flags
))
8251 if (!test_bit(Journal
, &rdev
->flags
)) {
8253 ! (rdev
->saved_raid_disk
>= 0 &&
8254 !test_bit(Bitmap_sync
, &rdev
->flags
)))
8257 rdev
->recovery_offset
= 0;
8260 hot_add_disk(mddev
, rdev
) == 0) {
8261 if (sysfs_link_rdev(mddev
, rdev
))
8262 /* failure here is OK */;
8263 if (!test_bit(Journal
, &rdev
->flags
))
8265 md_new_event(mddev
);
8266 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8271 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8275 static void md_start_sync(struct work_struct
*ws
)
8277 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
8280 mddev
->sync_thread
= md_register_thread(md_do_sync
,
8283 if (!mddev
->sync_thread
) {
8284 if (!(mddev_is_clustered(mddev
) && ret
== -EAGAIN
))
8285 printk(KERN_ERR
"%s: could not start resync"
8288 /* leave the spares where they are, it shouldn't hurt */
8289 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8290 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8291 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8292 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8293 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8294 wake_up(&resync_wait
);
8295 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8297 if (mddev
->sysfs_action
)
8298 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8300 md_wakeup_thread(mddev
->sync_thread
);
8301 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8302 md_new_event(mddev
);
8306 * This routine is regularly called by all per-raid-array threads to
8307 * deal with generic issues like resync and super-block update.
8308 * Raid personalities that don't have a thread (linear/raid0) do not
8309 * need this as they never do any recovery or update the superblock.
8311 * It does not do any resync itself, but rather "forks" off other threads
8312 * to do that as needed.
8313 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
8314 * "->recovery" and create a thread at ->sync_thread.
8315 * When the thread finishes it sets MD_RECOVERY_DONE
8316 * and wakeups up this thread which will reap the thread and finish up.
8317 * This thread also removes any faulty devices (with nr_pending == 0).
8319 * The overall approach is:
8320 * 1/ if the superblock needs updating, update it.
8321 * 2/ If a recovery thread is running, don't do anything else.
8322 * 3/ If recovery has finished, clean up, possibly marking spares active.
8323 * 4/ If there are any faulty devices, remove them.
8324 * 5/ If array is degraded, try to add spares devices
8325 * 6/ If array has spares or is not in-sync, start a resync thread.
8327 void md_check_recovery(struct mddev
*mddev
)
8329 if (mddev
->suspended
)
8333 bitmap_daemon_work(mddev
);
8335 if (signal_pending(current
)) {
8336 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
8337 printk(KERN_INFO
"md: %s in immediate safe mode\n",
8339 mddev
->safemode
= 2;
8341 flush_signals(current
);
8344 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
8347 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
8348 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8349 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
8350 test_bit(MD_RELOAD_SB
, &mddev
->flags
) ||
8351 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
8352 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
8353 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
8357 if (mddev_trylock(mddev
)) {
8361 struct md_rdev
*rdev
;
8362 if (!mddev
->external
&& mddev
->in_sync
)
8363 /* 'Blocked' flag not needed as failed devices
8364 * will be recorded if array switched to read/write.
8365 * Leaving it set will prevent the device
8366 * from being removed.
8368 rdev_for_each(rdev
, mddev
)
8369 clear_bit(Blocked
, &rdev
->flags
);
8370 /* On a read-only array we can:
8371 * - remove failed devices
8372 * - add already-in_sync devices if the array itself
8374 * As we only add devices that are already in-sync,
8375 * we can activate the spares immediately.
8377 remove_and_add_spares(mddev
, NULL
);
8378 /* There is no thread, but we need to call
8379 * ->spare_active and clear saved_raid_disk
8381 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8382 md_reap_sync_thread(mddev
);
8383 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8384 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8385 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
8389 if (mddev_is_clustered(mddev
)) {
8390 struct md_rdev
*rdev
;
8391 /* kick the device if another node issued a
8394 rdev_for_each(rdev
, mddev
) {
8395 if (test_and_clear_bit(ClusterRemove
, &rdev
->flags
) &&
8396 rdev
->raid_disk
< 0)
8397 md_kick_rdev_from_array(rdev
);
8400 if (test_and_clear_bit(MD_RELOAD_SB
, &mddev
->flags
))
8401 md_reload_sb(mddev
, mddev
->good_device_nr
);
8404 if (!mddev
->external
) {
8406 spin_lock(&mddev
->lock
);
8407 if (mddev
->safemode
&&
8408 !atomic_read(&mddev
->writes_pending
) &&
8410 mddev
->recovery_cp
== MaxSector
) {
8413 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
8415 if (mddev
->safemode
== 1)
8416 mddev
->safemode
= 0;
8417 spin_unlock(&mddev
->lock
);
8419 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
8422 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
8423 md_update_sb(mddev
, 0);
8425 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
8426 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
8427 /* resync/recovery still happening */
8428 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8431 if (mddev
->sync_thread
) {
8432 md_reap_sync_thread(mddev
);
8435 /* Set RUNNING before clearing NEEDED to avoid
8436 * any transients in the value of "sync_action".
8438 mddev
->curr_resync_completed
= 0;
8439 spin_lock(&mddev
->lock
);
8440 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8441 spin_unlock(&mddev
->lock
);
8442 /* Clear some bits that don't mean anything, but
8445 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
8446 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8448 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
8449 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
8451 /* no recovery is running.
8452 * remove any failed drives, then
8453 * add spares if possible.
8454 * Spares are also removed and re-added, to allow
8455 * the personality to fail the re-add.
8458 if (mddev
->reshape_position
!= MaxSector
) {
8459 if (mddev
->pers
->check_reshape
== NULL
||
8460 mddev
->pers
->check_reshape(mddev
) != 0)
8461 /* Cannot proceed */
8463 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8464 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8465 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
8466 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8467 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8468 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8469 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8470 } else if (mddev
->recovery_cp
< MaxSector
) {
8471 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8472 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
8473 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
8474 /* nothing to be done ... */
8477 if (mddev
->pers
->sync_request
) {
8479 /* We are adding a device or devices to an array
8480 * which has the bitmap stored on all devices.
8481 * So make sure all bitmap pages get written
8483 bitmap_write_all(mddev
->bitmap
);
8485 INIT_WORK(&mddev
->del_work
, md_start_sync
);
8486 queue_work(md_misc_wq
, &mddev
->del_work
);
8490 if (!mddev
->sync_thread
) {
8491 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8492 wake_up(&resync_wait
);
8493 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
8495 if (mddev
->sysfs_action
)
8496 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8499 wake_up(&mddev
->sb_wait
);
8500 mddev_unlock(mddev
);
8503 EXPORT_SYMBOL(md_check_recovery
);
8505 void md_reap_sync_thread(struct mddev
*mddev
)
8507 struct md_rdev
*rdev
;
8509 /* resync has finished, collect result */
8510 md_unregister_thread(&mddev
->sync_thread
);
8511 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
8512 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
8514 /* activate any spares */
8515 if (mddev
->pers
->spare_active(mddev
)) {
8516 sysfs_notify(&mddev
->kobj
, NULL
,
8518 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
8521 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
8522 mddev
->pers
->finish_reshape
)
8523 mddev
->pers
->finish_reshape(mddev
);
8525 /* If array is no-longer degraded, then any saved_raid_disk
8526 * information must be scrapped.
8528 if (!mddev
->degraded
)
8529 rdev_for_each(rdev
, mddev
)
8530 rdev
->saved_raid_disk
= -1;
8532 md_update_sb(mddev
, 1);
8533 /* MD_CHANGE_PENDING should be cleared by md_update_sb, so we can
8534 * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by
8536 if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED
, &mddev
->flags
))
8537 md_cluster_ops
->resync_finish(mddev
);
8538 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
8539 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
8540 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
8541 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
8542 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
8543 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
8544 wake_up(&resync_wait
);
8545 /* flag recovery needed just to double check */
8546 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8547 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
8548 md_new_event(mddev
);
8549 if (mddev
->event_work
.func
)
8550 queue_work(md_misc_wq
, &mddev
->event_work
);
8552 EXPORT_SYMBOL(md_reap_sync_thread
);
8554 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8556 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8557 wait_event_timeout(rdev
->blocked_wait
,
8558 !test_bit(Blocked
, &rdev
->flags
) &&
8559 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8560 msecs_to_jiffies(5000));
8561 rdev_dec_pending(rdev
, mddev
);
8563 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8565 void md_finish_reshape(struct mddev
*mddev
)
8567 /* called be personality module when reshape completes. */
8568 struct md_rdev
*rdev
;
8570 rdev_for_each(rdev
, mddev
) {
8571 if (rdev
->data_offset
> rdev
->new_data_offset
)
8572 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8574 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8575 rdev
->data_offset
= rdev
->new_data_offset
;
8578 EXPORT_SYMBOL(md_finish_reshape
);
8580 /* Bad block management */
8582 /* Returns 1 on success, 0 on failure */
8583 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8586 struct mddev
*mddev
= rdev
->mddev
;
8589 s
+= rdev
->new_data_offset
;
8591 s
+= rdev
->data_offset
;
8592 rv
= badblocks_set(&rdev
->badblocks
, s
, sectors
, 0);
8594 /* Make sure they get written out promptly */
8595 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8596 set_mask_bits(&mddev
->flags
, 0,
8597 BIT(MD_CHANGE_CLEAN
) | BIT(MD_CHANGE_PENDING
));
8598 md_wakeup_thread(rdev
->mddev
->thread
);
8603 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8605 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8609 s
+= rdev
->new_data_offset
;
8611 s
+= rdev
->data_offset
;
8612 return badblocks_clear(&rdev
->badblocks
,
8615 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8617 static int md_notify_reboot(struct notifier_block
*this,
8618 unsigned long code
, void *x
)
8620 struct list_head
*tmp
;
8621 struct mddev
*mddev
;
8624 for_each_mddev(mddev
, tmp
) {
8625 if (mddev_trylock(mddev
)) {
8627 __md_stop_writes(mddev
);
8628 if (mddev
->persistent
)
8629 mddev
->safemode
= 2;
8630 mddev_unlock(mddev
);
8635 * certain more exotic SCSI devices are known to be
8636 * volatile wrt too early system reboots. While the
8637 * right place to handle this issue is the given
8638 * driver, we do want to have a safe RAID driver ...
8646 static struct notifier_block md_notifier
= {
8647 .notifier_call
= md_notify_reboot
,
8649 .priority
= INT_MAX
, /* before any real devices */
8652 static void md_geninit(void)
8654 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8656 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8659 static int __init
md_init(void)
8663 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8667 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8671 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8674 if ((ret
= register_blkdev(0, "mdp")) < 0)
8678 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8679 md_probe
, NULL
, NULL
);
8680 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8681 md_probe
, NULL
, NULL
);
8683 register_reboot_notifier(&md_notifier
);
8684 raid_table_header
= register_sysctl_table(raid_root_table
);
8690 unregister_blkdev(MD_MAJOR
, "md");
8692 destroy_workqueue(md_misc_wq
);
8694 destroy_workqueue(md_wq
);
8699 static void check_sb_changes(struct mddev
*mddev
, struct md_rdev
*rdev
)
8701 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
8702 struct md_rdev
*rdev2
;
8704 char b
[BDEVNAME_SIZE
];
8706 /* Check for change of roles in the active devices */
8707 rdev_for_each(rdev2
, mddev
) {
8708 if (test_bit(Faulty
, &rdev2
->flags
))
8711 /* Check if the roles changed */
8712 role
= le16_to_cpu(sb
->dev_roles
[rdev2
->desc_nr
]);
8714 if (test_bit(Candidate
, &rdev2
->flags
)) {
8715 if (role
== 0xfffe) {
8716 pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2
->bdev
,b
));
8717 md_kick_rdev_from_array(rdev2
);
8721 clear_bit(Candidate
, &rdev2
->flags
);
8724 if (role
!= rdev2
->raid_disk
) {
8726 if (rdev2
->raid_disk
== -1 && role
!= 0xffff) {
8727 rdev2
->saved_raid_disk
= role
;
8728 ret
= remove_and_add_spares(mddev
, rdev2
);
8729 pr_info("Activated spare: %s\n",
8730 bdevname(rdev2
->bdev
,b
));
8731 /* wakeup mddev->thread here, so array could
8732 * perform resync with the new activated disk */
8733 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
8734 md_wakeup_thread(mddev
->thread
);
8738 * We just want to do the minimum to mark the disk
8739 * as faulty. The recovery is performed by the
8740 * one who initiated the error.
8742 if ((role
== 0xfffe) || (role
== 0xfffd)) {
8743 md_error(mddev
, rdev2
);
8744 clear_bit(Blocked
, &rdev2
->flags
);
8749 if (mddev
->raid_disks
!= le32_to_cpu(sb
->raid_disks
))
8750 update_raid_disks(mddev
, le32_to_cpu(sb
->raid_disks
));
8752 /* Finally set the event to be up to date */
8753 mddev
->events
= le64_to_cpu(sb
->events
);
8756 static int read_rdev(struct mddev
*mddev
, struct md_rdev
*rdev
)
8759 struct page
*swapout
= rdev
->sb_page
;
8760 struct mdp_superblock_1
*sb
;
8762 /* Store the sb page of the rdev in the swapout temporary
8763 * variable in case we err in the future
8765 rdev
->sb_page
= NULL
;
8766 alloc_disk_sb(rdev
);
8767 ClearPageUptodate(rdev
->sb_page
);
8768 rdev
->sb_loaded
= 0;
8769 err
= super_types
[mddev
->major_version
].load_super(rdev
, NULL
, mddev
->minor_version
);
8772 pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n",
8773 __func__
, __LINE__
, rdev
->desc_nr
, err
);
8774 put_page(rdev
->sb_page
);
8775 rdev
->sb_page
= swapout
;
8776 rdev
->sb_loaded
= 1;
8780 sb
= page_address(rdev
->sb_page
);
8781 /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET
8785 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RECOVERY_OFFSET
))
8786 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
8788 /* The other node finished recovery, call spare_active to set
8789 * device In_sync and mddev->degraded
8791 if (rdev
->recovery_offset
== MaxSector
&&
8792 !test_bit(In_sync
, &rdev
->flags
) &&
8793 mddev
->pers
->spare_active(mddev
))
8794 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
8800 void md_reload_sb(struct mddev
*mddev
, int nr
)
8802 struct md_rdev
*rdev
;
8806 rdev_for_each_rcu(rdev
, mddev
) {
8807 if (rdev
->desc_nr
== nr
)
8811 if (!rdev
|| rdev
->desc_nr
!= nr
) {
8812 pr_warn("%s: %d Could not find rdev with nr %d\n", __func__
, __LINE__
, nr
);
8816 err
= read_rdev(mddev
, rdev
);
8820 check_sb_changes(mddev
, rdev
);
8822 /* Read all rdev's to update recovery_offset */
8823 rdev_for_each_rcu(rdev
, mddev
)
8824 read_rdev(mddev
, rdev
);
8826 EXPORT_SYMBOL(md_reload_sb
);
8831 * Searches all registered partitions for autorun RAID arrays
8835 static DEFINE_MUTEX(detected_devices_mutex
);
8836 static LIST_HEAD(all_detected_devices
);
8837 struct detected_devices_node
{
8838 struct list_head list
;
8842 void md_autodetect_dev(dev_t dev
)
8844 struct detected_devices_node
*node_detected_dev
;
8846 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8847 if (node_detected_dev
) {
8848 node_detected_dev
->dev
= dev
;
8849 mutex_lock(&detected_devices_mutex
);
8850 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8851 mutex_unlock(&detected_devices_mutex
);
8853 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8854 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8858 static void autostart_arrays(int part
)
8860 struct md_rdev
*rdev
;
8861 struct detected_devices_node
*node_detected_dev
;
8863 int i_scanned
, i_passed
;
8868 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8870 mutex_lock(&detected_devices_mutex
);
8871 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8873 node_detected_dev
= list_entry(all_detected_devices
.next
,
8874 struct detected_devices_node
, list
);
8875 list_del(&node_detected_dev
->list
);
8876 dev
= node_detected_dev
->dev
;
8877 kfree(node_detected_dev
);
8878 rdev
= md_import_device(dev
,0, 90);
8882 if (test_bit(Faulty
, &rdev
->flags
))
8885 set_bit(AutoDetected
, &rdev
->flags
);
8886 list_add(&rdev
->same_set
, &pending_raid_disks
);
8889 mutex_unlock(&detected_devices_mutex
);
8891 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8892 i_scanned
, i_passed
);
8894 autorun_devices(part
);
8897 #endif /* !MODULE */
8899 static __exit
void md_exit(void)
8901 struct mddev
*mddev
;
8902 struct list_head
*tmp
;
8905 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8906 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8908 unregister_blkdev(MD_MAJOR
,"md");
8909 unregister_blkdev(mdp_major
, "mdp");
8910 unregister_reboot_notifier(&md_notifier
);
8911 unregister_sysctl_table(raid_table_header
);
8913 /* We cannot unload the modules while some process is
8914 * waiting for us in select() or poll() - wake them up
8917 while (waitqueue_active(&md_event_waiters
)) {
8918 /* not safe to leave yet */
8919 wake_up(&md_event_waiters
);
8923 remove_proc_entry("mdstat", NULL
);
8925 for_each_mddev(mddev
, tmp
) {
8926 export_array(mddev
);
8927 mddev
->hold_active
= 0;
8929 destroy_workqueue(md_misc_wq
);
8930 destroy_workqueue(md_wq
);
8933 subsys_initcall(md_init
);
8934 module_exit(md_exit
)
8936 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8938 return sprintf(buffer
, "%d", start_readonly
);
8940 static int set_ro(const char *val
, struct kernel_param
*kp
)
8942 return kstrtouint(val
, 10, (unsigned int *)&start_readonly
);
8945 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8946 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8947 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8949 MODULE_LICENSE("GPL");
8950 MODULE_DESCRIPTION("MD RAID framework");
8952 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);