2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/smp_lock.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
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/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
62 static void autostart_arrays(int part
);
65 static LIST_HEAD(pers_list
);
66 static DEFINE_SPINLOCK(pers_lock
);
68 static void md_print_devices(void);
70 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
72 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
75 * Default number of read corrections we'll attempt on an rdev
76 * before ejecting it from the array. We divide the read error
77 * count by 2 for every hour elapsed between read errors.
79 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
81 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
82 * is 1000 KB/sec, so the extra system load does not show up that much.
83 * Increase it if you want to have more _guaranteed_ speed. Note that
84 * the RAID driver will use the maximum available bandwidth if the IO
85 * subsystem is idle. There is also an 'absolute maximum' reconstruction
86 * speed limit - in case reconstruction slows down your system despite
89 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
90 * or /sys/block/mdX/md/sync_speed_{min,max}
93 static int sysctl_speed_limit_min
= 1000;
94 static int sysctl_speed_limit_max
= 200000;
95 static inline int speed_min(mddev_t
*mddev
)
97 return mddev
->sync_speed_min
?
98 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
101 static inline int speed_max(mddev_t
*mddev
)
103 return mddev
->sync_speed_max
?
104 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
107 static struct ctl_table_header
*raid_table_header
;
109 static ctl_table raid_table
[] = {
111 .procname
= "speed_limit_min",
112 .data
= &sysctl_speed_limit_min
,
113 .maxlen
= sizeof(int),
114 .mode
= S_IRUGO
|S_IWUSR
,
115 .proc_handler
= proc_dointvec
,
118 .procname
= "speed_limit_max",
119 .data
= &sysctl_speed_limit_max
,
120 .maxlen
= sizeof(int),
121 .mode
= S_IRUGO
|S_IWUSR
,
122 .proc_handler
= proc_dointvec
,
127 static ctl_table raid_dir_table
[] = {
131 .mode
= S_IRUGO
|S_IXUGO
,
137 static ctl_table raid_root_table
[] = {
142 .child
= raid_dir_table
,
147 static const struct block_device_operations md_fops
;
149 static int start_readonly
;
152 * We have a system wide 'event count' that is incremented
153 * on any 'interesting' event, and readers of /proc/mdstat
154 * can use 'poll' or 'select' to find out when the event
158 * start array, stop array, error, add device, remove device,
159 * start build, activate spare
161 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
162 static atomic_t md_event_count
;
163 void md_new_event(mddev_t
*mddev
)
165 atomic_inc(&md_event_count
);
166 wake_up(&md_event_waiters
);
168 EXPORT_SYMBOL_GPL(md_new_event
);
170 /* Alternate version that can be called from interrupts
171 * when calling sysfs_notify isn't needed.
173 static void md_new_event_inintr(mddev_t
*mddev
)
175 atomic_inc(&md_event_count
);
176 wake_up(&md_event_waiters
);
180 * Enables to iterate over all existing md arrays
181 * all_mddevs_lock protects this list.
183 static LIST_HEAD(all_mddevs
);
184 static DEFINE_SPINLOCK(all_mddevs_lock
);
188 * iterates through all used mddevs in the system.
189 * We take care to grab the all_mddevs_lock whenever navigating
190 * the list, and to always hold a refcount when unlocked.
191 * Any code which breaks out of this loop while own
192 * a reference to the current mddev and must mddev_put it.
194 #define for_each_mddev(mddev,tmp) \
196 for (({ spin_lock(&all_mddevs_lock); \
197 tmp = all_mddevs.next; \
199 ({ if (tmp != &all_mddevs) \
200 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
201 spin_unlock(&all_mddevs_lock); \
202 if (mddev) mddev_put(mddev); \
203 mddev = list_entry(tmp, mddev_t, all_mddevs); \
204 tmp != &all_mddevs;}); \
205 ({ spin_lock(&all_mddevs_lock); \
210 /* Rather than calling directly into the personality make_request function,
211 * IO requests come here first so that we can check if the device is
212 * being suspended pending a reconfiguration.
213 * We hold a refcount over the call to ->make_request. By the time that
214 * call has finished, the bio has been linked into some internal structure
215 * and so is visible to ->quiesce(), so we don't need the refcount any more.
217 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
219 const int rw
= bio_data_dir(bio
);
220 mddev_t
*mddev
= q
->queuedata
;
224 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
229 if (mddev
->suspended
|| mddev
->barrier
) {
232 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
233 TASK_UNINTERRUPTIBLE
);
234 if (!mddev
->suspended
&& !mddev
->barrier
)
240 finish_wait(&mddev
->sb_wait
, &__wait
);
242 atomic_inc(&mddev
->active_io
);
245 rv
= mddev
->pers
->make_request(mddev
, bio
);
247 cpu
= part_stat_lock();
248 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
249 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
],
253 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
254 wake_up(&mddev
->sb_wait
);
259 /* mddev_suspend makes sure no new requests are submitted
260 * to the device, and that any requests that have been submitted
261 * are completely handled.
262 * Once ->stop is called and completes, the module will be completely
265 void mddev_suspend(mddev_t
*mddev
)
267 BUG_ON(mddev
->suspended
);
268 mddev
->suspended
= 1;
270 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
271 mddev
->pers
->quiesce(mddev
, 1);
273 EXPORT_SYMBOL_GPL(mddev_suspend
);
275 void mddev_resume(mddev_t
*mddev
)
277 mddev
->suspended
= 0;
278 wake_up(&mddev
->sb_wait
);
279 mddev
->pers
->quiesce(mddev
, 0);
281 EXPORT_SYMBOL_GPL(mddev_resume
);
283 int mddev_congested(mddev_t
*mddev
, int bits
)
287 return mddev
->suspended
;
289 EXPORT_SYMBOL(mddev_congested
);
292 * Generic barrier handling for md
295 #define POST_REQUEST_BARRIER ((void*)1)
297 static void md_end_barrier(struct bio
*bio
, int err
)
299 mdk_rdev_t
*rdev
= bio
->bi_private
;
300 mddev_t
*mddev
= rdev
->mddev
;
301 if (err
== -EOPNOTSUPP
&& mddev
->barrier
!= POST_REQUEST_BARRIER
)
302 set_bit(BIO_EOPNOTSUPP
, &mddev
->barrier
->bi_flags
);
304 rdev_dec_pending(rdev
, mddev
);
306 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
307 if (mddev
->barrier
== POST_REQUEST_BARRIER
) {
308 /* This was a post-request barrier */
309 mddev
->barrier
= NULL
;
310 wake_up(&mddev
->sb_wait
);
312 /* The pre-request barrier has finished */
313 schedule_work(&mddev
->barrier_work
);
318 static void submit_barriers(mddev_t
*mddev
)
323 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
324 if (rdev
->raid_disk
>= 0 &&
325 !test_bit(Faulty
, &rdev
->flags
)) {
326 /* Take two references, one is dropped
327 * when request finishes, one after
328 * we reclaim rcu_read_lock
331 atomic_inc(&rdev
->nr_pending
);
332 atomic_inc(&rdev
->nr_pending
);
334 bi
= bio_alloc(GFP_KERNEL
, 0);
335 bi
->bi_end_io
= md_end_barrier
;
336 bi
->bi_private
= rdev
;
337 bi
->bi_bdev
= rdev
->bdev
;
338 atomic_inc(&mddev
->flush_pending
);
339 submit_bio(WRITE_BARRIER
, bi
);
341 rdev_dec_pending(rdev
, mddev
);
346 static void md_submit_barrier(struct work_struct
*ws
)
348 mddev_t
*mddev
= container_of(ws
, mddev_t
, barrier_work
);
349 struct bio
*bio
= mddev
->barrier
;
351 atomic_set(&mddev
->flush_pending
, 1);
353 if (test_bit(BIO_EOPNOTSUPP
, &bio
->bi_flags
))
354 bio_endio(bio
, -EOPNOTSUPP
);
355 else if (bio
->bi_size
== 0)
356 /* an empty barrier - all done */
359 bio
->bi_rw
&= ~REQ_HARDBARRIER
;
360 if (mddev
->pers
->make_request(mddev
, bio
))
361 generic_make_request(bio
);
362 mddev
->barrier
= POST_REQUEST_BARRIER
;
363 submit_barriers(mddev
);
365 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
366 mddev
->barrier
= NULL
;
367 wake_up(&mddev
->sb_wait
);
371 void md_barrier_request(mddev_t
*mddev
, struct bio
*bio
)
373 spin_lock_irq(&mddev
->write_lock
);
374 wait_event_lock_irq(mddev
->sb_wait
,
376 mddev
->write_lock
, /*nothing*/);
377 mddev
->barrier
= bio
;
378 spin_unlock_irq(&mddev
->write_lock
);
380 atomic_set(&mddev
->flush_pending
, 1);
381 INIT_WORK(&mddev
->barrier_work
, md_submit_barrier
);
383 submit_barriers(mddev
);
385 if (atomic_dec_and_test(&mddev
->flush_pending
))
386 schedule_work(&mddev
->barrier_work
);
388 EXPORT_SYMBOL(md_barrier_request
);
390 /* Support for plugging.
391 * This mirrors the plugging support in request_queue, but does not
392 * require having a whole queue
394 static void plugger_work(struct work_struct
*work
)
396 struct plug_handle
*plug
=
397 container_of(work
, struct plug_handle
, unplug_work
);
398 plug
->unplug_fn(plug
);
400 static void plugger_timeout(unsigned long data
)
402 struct plug_handle
*plug
= (void *)data
;
403 kblockd_schedule_work(NULL
, &plug
->unplug_work
);
405 void plugger_init(struct plug_handle
*plug
,
406 void (*unplug_fn
)(struct plug_handle
*))
408 plug
->unplug_flag
= 0;
409 plug
->unplug_fn
= unplug_fn
;
410 init_timer(&plug
->unplug_timer
);
411 plug
->unplug_timer
.function
= plugger_timeout
;
412 plug
->unplug_timer
.data
= (unsigned long)plug
;
413 INIT_WORK(&plug
->unplug_work
, plugger_work
);
415 EXPORT_SYMBOL_GPL(plugger_init
);
417 void plugger_set_plug(struct plug_handle
*plug
)
419 if (!test_and_set_bit(PLUGGED_FLAG
, &plug
->unplug_flag
))
420 mod_timer(&plug
->unplug_timer
, jiffies
+ msecs_to_jiffies(3)+1);
422 EXPORT_SYMBOL_GPL(plugger_set_plug
);
424 int plugger_remove_plug(struct plug_handle
*plug
)
426 if (test_and_clear_bit(PLUGGED_FLAG
, &plug
->unplug_flag
)) {
427 del_timer(&plug
->unplug_timer
);
432 EXPORT_SYMBOL_GPL(plugger_remove_plug
);
435 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
437 atomic_inc(&mddev
->active
);
441 static void mddev_delayed_delete(struct work_struct
*ws
);
443 static void mddev_put(mddev_t
*mddev
)
445 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
447 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
448 mddev
->ctime
== 0 && !mddev
->hold_active
) {
449 /* Array is not configured at all, and not held active,
451 list_del(&mddev
->all_mddevs
);
452 if (mddev
->gendisk
) {
453 /* we did a probe so need to clean up.
454 * Call schedule_work inside the spinlock
455 * so that flush_scheduled_work() after
456 * mddev_find will succeed in waiting for the
459 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
460 schedule_work(&mddev
->del_work
);
464 spin_unlock(&all_mddevs_lock
);
467 void mddev_init(mddev_t
*mddev
)
469 mutex_init(&mddev
->open_mutex
);
470 mutex_init(&mddev
->reconfig_mutex
);
471 mutex_init(&mddev
->bitmap_info
.mutex
);
472 INIT_LIST_HEAD(&mddev
->disks
);
473 INIT_LIST_HEAD(&mddev
->all_mddevs
);
474 init_timer(&mddev
->safemode_timer
);
475 atomic_set(&mddev
->active
, 1);
476 atomic_set(&mddev
->openers
, 0);
477 atomic_set(&mddev
->active_io
, 0);
478 spin_lock_init(&mddev
->write_lock
);
479 atomic_set(&mddev
->flush_pending
, 0);
480 init_waitqueue_head(&mddev
->sb_wait
);
481 init_waitqueue_head(&mddev
->recovery_wait
);
482 mddev
->reshape_position
= MaxSector
;
483 mddev
->resync_min
= 0;
484 mddev
->resync_max
= MaxSector
;
485 mddev
->level
= LEVEL_NONE
;
487 EXPORT_SYMBOL_GPL(mddev_init
);
489 static mddev_t
* mddev_find(dev_t unit
)
491 mddev_t
*mddev
, *new = NULL
;
494 spin_lock(&all_mddevs_lock
);
497 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
498 if (mddev
->unit
== unit
) {
500 spin_unlock(&all_mddevs_lock
);
506 list_add(&new->all_mddevs
, &all_mddevs
);
507 spin_unlock(&all_mddevs_lock
);
508 new->hold_active
= UNTIL_IOCTL
;
512 /* find an unused unit number */
513 static int next_minor
= 512;
514 int start
= next_minor
;
518 dev
= MKDEV(MD_MAJOR
, next_minor
);
520 if (next_minor
> MINORMASK
)
522 if (next_minor
== start
) {
523 /* Oh dear, all in use. */
524 spin_unlock(&all_mddevs_lock
);
530 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
531 if (mddev
->unit
== dev
) {
537 new->md_minor
= MINOR(dev
);
538 new->hold_active
= UNTIL_STOP
;
539 list_add(&new->all_mddevs
, &all_mddevs
);
540 spin_unlock(&all_mddevs_lock
);
543 spin_unlock(&all_mddevs_lock
);
545 new = kzalloc(sizeof(*new), GFP_KERNEL
);
550 if (MAJOR(unit
) == MD_MAJOR
)
551 new->md_minor
= MINOR(unit
);
553 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
560 static inline int mddev_lock(mddev_t
* mddev
)
562 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
565 static inline int mddev_is_locked(mddev_t
*mddev
)
567 return mutex_is_locked(&mddev
->reconfig_mutex
);
570 static inline int mddev_trylock(mddev_t
* mddev
)
572 return mutex_trylock(&mddev
->reconfig_mutex
);
575 static struct attribute_group md_redundancy_group
;
577 static void mddev_unlock(mddev_t
* mddev
)
579 if (mddev
->to_remove
) {
580 /* These cannot be removed under reconfig_mutex as
581 * an access to the files will try to take reconfig_mutex
582 * while holding the file unremovable, which leads to
584 * So hold set sysfs_active while the remove in happeing,
585 * and anything else which might set ->to_remove or my
586 * otherwise change the sysfs namespace will fail with
587 * -EBUSY if sysfs_active is still set.
588 * We set sysfs_active under reconfig_mutex and elsewhere
589 * test it under the same mutex to ensure its correct value
592 struct attribute_group
*to_remove
= mddev
->to_remove
;
593 mddev
->to_remove
= NULL
;
594 mddev
->sysfs_active
= 1;
595 mutex_unlock(&mddev
->reconfig_mutex
);
597 if (mddev
->kobj
.sd
) {
598 if (to_remove
!= &md_redundancy_group
)
599 sysfs_remove_group(&mddev
->kobj
, to_remove
);
600 if (mddev
->pers
== NULL
||
601 mddev
->pers
->sync_request
== NULL
) {
602 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
603 if (mddev
->sysfs_action
)
604 sysfs_put(mddev
->sysfs_action
);
605 mddev
->sysfs_action
= NULL
;
608 mddev
->sysfs_active
= 0;
610 mutex_unlock(&mddev
->reconfig_mutex
);
612 md_wakeup_thread(mddev
->thread
);
615 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
619 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
620 if (rdev
->desc_nr
== nr
)
626 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
630 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
631 if (rdev
->bdev
->bd_dev
== dev
)
637 static struct mdk_personality
*find_pers(int level
, char *clevel
)
639 struct mdk_personality
*pers
;
640 list_for_each_entry(pers
, &pers_list
, list
) {
641 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
643 if (strcmp(pers
->name
, clevel
)==0)
649 /* return the offset of the super block in 512byte sectors */
650 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
652 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
653 return MD_NEW_SIZE_SECTORS(num_sectors
);
656 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
661 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
662 if (!rdev
->sb_page
) {
663 printk(KERN_ALERT
"md: out of memory.\n");
670 static void free_disk_sb(mdk_rdev_t
* rdev
)
673 put_page(rdev
->sb_page
);
675 rdev
->sb_page
= NULL
;
682 static void super_written(struct bio
*bio
, int error
)
684 mdk_rdev_t
*rdev
= bio
->bi_private
;
685 mddev_t
*mddev
= rdev
->mddev
;
687 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
688 printk("md: super_written gets error=%d, uptodate=%d\n",
689 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
690 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
691 md_error(mddev
, rdev
);
694 if (atomic_dec_and_test(&mddev
->pending_writes
))
695 wake_up(&mddev
->sb_wait
);
699 static void super_written_barrier(struct bio
*bio
, int error
)
701 struct bio
*bio2
= bio
->bi_private
;
702 mdk_rdev_t
*rdev
= bio2
->bi_private
;
703 mddev_t
*mddev
= rdev
->mddev
;
705 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
706 error
== -EOPNOTSUPP
) {
708 /* barriers don't appear to be supported :-( */
709 set_bit(BarriersNotsupp
, &rdev
->flags
);
710 mddev
->barriers_work
= 0;
711 spin_lock_irqsave(&mddev
->write_lock
, flags
);
712 bio2
->bi_next
= mddev
->biolist
;
713 mddev
->biolist
= bio2
;
714 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
715 wake_up(&mddev
->sb_wait
);
719 bio
->bi_private
= rdev
;
720 super_written(bio
, error
);
724 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
725 sector_t sector
, int size
, struct page
*page
)
727 /* write first size bytes of page to sector of rdev
728 * Increment mddev->pending_writes before returning
729 * and decrement it on completion, waking up sb_wait
730 * if zero is reached.
731 * If an error occurred, call md_error
733 * As we might need to resubmit the request if REQ_HARDBARRIER
734 * causes ENOTSUPP, we allocate a spare bio...
736 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
737 int rw
= REQ_WRITE
| REQ_SYNC
| REQ_UNPLUG
;
739 bio
->bi_bdev
= rdev
->bdev
;
740 bio
->bi_sector
= sector
;
741 bio_add_page(bio
, page
, size
, 0);
742 bio
->bi_private
= rdev
;
743 bio
->bi_end_io
= super_written
;
746 atomic_inc(&mddev
->pending_writes
);
747 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
749 rw
|= REQ_HARDBARRIER
;
750 rbio
= bio_clone(bio
, GFP_NOIO
);
751 rbio
->bi_private
= bio
;
752 rbio
->bi_end_io
= super_written_barrier
;
753 submit_bio(rw
, rbio
);
758 void md_super_wait(mddev_t
*mddev
)
760 /* wait for all superblock writes that were scheduled to complete.
761 * if any had to be retried (due to BARRIER problems), retry them
765 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
766 if (atomic_read(&mddev
->pending_writes
)==0)
768 while (mddev
->biolist
) {
770 spin_lock_irq(&mddev
->write_lock
);
771 bio
= mddev
->biolist
;
772 mddev
->biolist
= bio
->bi_next
;
774 spin_unlock_irq(&mddev
->write_lock
);
775 submit_bio(bio
->bi_rw
, bio
);
779 finish_wait(&mddev
->sb_wait
, &wq
);
782 static void bi_complete(struct bio
*bio
, int error
)
784 complete((struct completion
*)bio
->bi_private
);
787 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
788 struct page
*page
, int rw
)
790 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
791 struct completion event
;
794 rw
|= REQ_SYNC
| REQ_UNPLUG
;
797 bio
->bi_sector
= sector
;
798 bio_add_page(bio
, page
, size
, 0);
799 init_completion(&event
);
800 bio
->bi_private
= &event
;
801 bio
->bi_end_io
= bi_complete
;
803 wait_for_completion(&event
);
805 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
809 EXPORT_SYMBOL_GPL(sync_page_io
);
811 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
813 char b
[BDEVNAME_SIZE
];
814 if (!rdev
->sb_page
) {
822 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
828 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
829 bdevname(rdev
->bdev
,b
));
833 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
835 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
836 sb1
->set_uuid1
== sb2
->set_uuid1
&&
837 sb1
->set_uuid2
== sb2
->set_uuid2
&&
838 sb1
->set_uuid3
== sb2
->set_uuid3
;
841 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
844 mdp_super_t
*tmp1
, *tmp2
;
846 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
847 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
849 if (!tmp1
|| !tmp2
) {
851 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
859 * nr_disks is not constant
864 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
872 static u32
md_csum_fold(u32 csum
)
874 csum
= (csum
& 0xffff) + (csum
>> 16);
875 return (csum
& 0xffff) + (csum
>> 16);
878 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
881 u32
*sb32
= (u32
*)sb
;
883 unsigned int disk_csum
, csum
;
885 disk_csum
= sb
->sb_csum
;
888 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
890 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
894 /* This used to use csum_partial, which was wrong for several
895 * reasons including that different results are returned on
896 * different architectures. It isn't critical that we get exactly
897 * the same return value as before (we always csum_fold before
898 * testing, and that removes any differences). However as we
899 * know that csum_partial always returned a 16bit value on
900 * alphas, do a fold to maximise conformity to previous behaviour.
902 sb
->sb_csum
= md_csum_fold(disk_csum
);
904 sb
->sb_csum
= disk_csum
;
911 * Handle superblock details.
912 * We want to be able to handle multiple superblock formats
913 * so we have a common interface to them all, and an array of
914 * different handlers.
915 * We rely on user-space to write the initial superblock, and support
916 * reading and updating of superblocks.
917 * Interface methods are:
918 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
919 * loads and validates a superblock on dev.
920 * if refdev != NULL, compare superblocks on both devices
922 * 0 - dev has a superblock that is compatible with refdev
923 * 1 - dev has a superblock that is compatible and newer than refdev
924 * so dev should be used as the refdev in future
925 * -EINVAL superblock incompatible or invalid
926 * -othererror e.g. -EIO
928 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
929 * Verify that dev is acceptable into mddev.
930 * The first time, mddev->raid_disks will be 0, and data from
931 * dev should be merged in. Subsequent calls check that dev
932 * is new enough. Return 0 or -EINVAL
934 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
935 * Update the superblock for rdev with data in mddev
936 * This does not write to disc.
942 struct module
*owner
;
943 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
945 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
946 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
947 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
948 sector_t num_sectors
);
952 * Check that the given mddev has no bitmap.
954 * This function is called from the run method of all personalities that do not
955 * support bitmaps. It prints an error message and returns non-zero if mddev
956 * has a bitmap. Otherwise, it returns 0.
959 int md_check_no_bitmap(mddev_t
*mddev
)
961 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
963 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
964 mdname(mddev
), mddev
->pers
->name
);
967 EXPORT_SYMBOL(md_check_no_bitmap
);
970 * load_super for 0.90.0
972 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
974 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
979 * Calculate the position of the superblock (512byte sectors),
980 * it's at the end of the disk.
982 * It also happens to be a multiple of 4Kb.
984 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
986 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
991 bdevname(rdev
->bdev
, b
);
992 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
994 if (sb
->md_magic
!= MD_SB_MAGIC
) {
995 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1000 if (sb
->major_version
!= 0 ||
1001 sb
->minor_version
< 90 ||
1002 sb
->minor_version
> 91) {
1003 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1004 sb
->major_version
, sb
->minor_version
,
1009 if (sb
->raid_disks
<= 0)
1012 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1013 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1018 rdev
->preferred_minor
= sb
->md_minor
;
1019 rdev
->data_offset
= 0;
1020 rdev
->sb_size
= MD_SB_BYTES
;
1022 if (sb
->level
== LEVEL_MULTIPATH
)
1025 rdev
->desc_nr
= sb
->this_disk
.number
;
1031 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
1032 if (!uuid_equal(refsb
, sb
)) {
1033 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1034 b
, bdevname(refdev
->bdev
,b2
));
1037 if (!sb_equal(refsb
, sb
)) {
1038 printk(KERN_WARNING
"md: %s has same UUID"
1039 " but different superblock to %s\n",
1040 b
, bdevname(refdev
->bdev
, b2
));
1044 ev2
= md_event(refsb
);
1050 rdev
->sectors
= rdev
->sb_start
;
1052 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
1053 /* "this cannot possibly happen" ... */
1061 * validate_super for 0.90.0
1063 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1066 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1067 __u64 ev1
= md_event(sb
);
1069 rdev
->raid_disk
= -1;
1070 clear_bit(Faulty
, &rdev
->flags
);
1071 clear_bit(In_sync
, &rdev
->flags
);
1072 clear_bit(WriteMostly
, &rdev
->flags
);
1073 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1075 if (mddev
->raid_disks
== 0) {
1076 mddev
->major_version
= 0;
1077 mddev
->minor_version
= sb
->minor_version
;
1078 mddev
->patch_version
= sb
->patch_version
;
1079 mddev
->external
= 0;
1080 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1081 mddev
->ctime
= sb
->ctime
;
1082 mddev
->utime
= sb
->utime
;
1083 mddev
->level
= sb
->level
;
1084 mddev
->clevel
[0] = 0;
1085 mddev
->layout
= sb
->layout
;
1086 mddev
->raid_disks
= sb
->raid_disks
;
1087 mddev
->dev_sectors
= sb
->size
* 2;
1088 mddev
->events
= ev1
;
1089 mddev
->bitmap_info
.offset
= 0;
1090 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1092 if (mddev
->minor_version
>= 91) {
1093 mddev
->reshape_position
= sb
->reshape_position
;
1094 mddev
->delta_disks
= sb
->delta_disks
;
1095 mddev
->new_level
= sb
->new_level
;
1096 mddev
->new_layout
= sb
->new_layout
;
1097 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1099 mddev
->reshape_position
= MaxSector
;
1100 mddev
->delta_disks
= 0;
1101 mddev
->new_level
= mddev
->level
;
1102 mddev
->new_layout
= mddev
->layout
;
1103 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1106 if (sb
->state
& (1<<MD_SB_CLEAN
))
1107 mddev
->recovery_cp
= MaxSector
;
1109 if (sb
->events_hi
== sb
->cp_events_hi
&&
1110 sb
->events_lo
== sb
->cp_events_lo
) {
1111 mddev
->recovery_cp
= sb
->recovery_cp
;
1113 mddev
->recovery_cp
= 0;
1116 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1117 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1118 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1119 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1121 mddev
->max_disks
= MD_SB_DISKS
;
1123 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1124 mddev
->bitmap_info
.file
== NULL
)
1125 mddev
->bitmap_info
.offset
=
1126 mddev
->bitmap_info
.default_offset
;
1128 } else if (mddev
->pers
== NULL
) {
1129 /* Insist on good event counter while assembling, except
1130 * for spares (which don't need an event count) */
1132 if (sb
->disks
[rdev
->desc_nr
].state
& (
1133 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1134 if (ev1
< mddev
->events
)
1136 } else if (mddev
->bitmap
) {
1137 /* if adding to array with a bitmap, then we can accept an
1138 * older device ... but not too old.
1140 if (ev1
< mddev
->bitmap
->events_cleared
)
1143 if (ev1
< mddev
->events
)
1144 /* just a hot-add of a new device, leave raid_disk at -1 */
1148 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1149 desc
= sb
->disks
+ rdev
->desc_nr
;
1151 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1152 set_bit(Faulty
, &rdev
->flags
);
1153 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1154 desc->raid_disk < mddev->raid_disks */) {
1155 set_bit(In_sync
, &rdev
->flags
);
1156 rdev
->raid_disk
= desc
->raid_disk
;
1157 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1158 /* active but not in sync implies recovery up to
1159 * reshape position. We don't know exactly where
1160 * that is, so set to zero for now */
1161 if (mddev
->minor_version
>= 91) {
1162 rdev
->recovery_offset
= 0;
1163 rdev
->raid_disk
= desc
->raid_disk
;
1166 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1167 set_bit(WriteMostly
, &rdev
->flags
);
1168 } else /* MULTIPATH are always insync */
1169 set_bit(In_sync
, &rdev
->flags
);
1174 * sync_super for 0.90.0
1176 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1180 int next_spare
= mddev
->raid_disks
;
1183 /* make rdev->sb match mddev data..
1186 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1187 * 3/ any empty disks < next_spare become removed
1189 * disks[0] gets initialised to REMOVED because
1190 * we cannot be sure from other fields if it has
1191 * been initialised or not.
1194 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1196 rdev
->sb_size
= MD_SB_BYTES
;
1198 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1200 memset(sb
, 0, sizeof(*sb
));
1202 sb
->md_magic
= MD_SB_MAGIC
;
1203 sb
->major_version
= mddev
->major_version
;
1204 sb
->patch_version
= mddev
->patch_version
;
1205 sb
->gvalid_words
= 0; /* ignored */
1206 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1207 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1208 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1209 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1211 sb
->ctime
= mddev
->ctime
;
1212 sb
->level
= mddev
->level
;
1213 sb
->size
= mddev
->dev_sectors
/ 2;
1214 sb
->raid_disks
= mddev
->raid_disks
;
1215 sb
->md_minor
= mddev
->md_minor
;
1216 sb
->not_persistent
= 0;
1217 sb
->utime
= mddev
->utime
;
1219 sb
->events_hi
= (mddev
->events
>>32);
1220 sb
->events_lo
= (u32
)mddev
->events
;
1222 if (mddev
->reshape_position
== MaxSector
)
1223 sb
->minor_version
= 90;
1225 sb
->minor_version
= 91;
1226 sb
->reshape_position
= mddev
->reshape_position
;
1227 sb
->new_level
= mddev
->new_level
;
1228 sb
->delta_disks
= mddev
->delta_disks
;
1229 sb
->new_layout
= mddev
->new_layout
;
1230 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1232 mddev
->minor_version
= sb
->minor_version
;
1235 sb
->recovery_cp
= mddev
->recovery_cp
;
1236 sb
->cp_events_hi
= (mddev
->events
>>32);
1237 sb
->cp_events_lo
= (u32
)mddev
->events
;
1238 if (mddev
->recovery_cp
== MaxSector
)
1239 sb
->state
= (1<< MD_SB_CLEAN
);
1241 sb
->recovery_cp
= 0;
1243 sb
->layout
= mddev
->layout
;
1244 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1246 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1247 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1249 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1250 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1253 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1255 if (rdev2
->raid_disk
>= 0 &&
1256 sb
->minor_version
>= 91)
1257 /* we have nowhere to store the recovery_offset,
1258 * but if it is not below the reshape_position,
1259 * we can piggy-back on that.
1262 if (rdev2
->raid_disk
< 0 ||
1263 test_bit(Faulty
, &rdev2
->flags
))
1266 desc_nr
= rdev2
->raid_disk
;
1268 desc_nr
= next_spare
++;
1269 rdev2
->desc_nr
= desc_nr
;
1270 d
= &sb
->disks
[rdev2
->desc_nr
];
1272 d
->number
= rdev2
->desc_nr
;
1273 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1274 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1276 d
->raid_disk
= rdev2
->raid_disk
;
1278 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1279 if (test_bit(Faulty
, &rdev2
->flags
))
1280 d
->state
= (1<<MD_DISK_FAULTY
);
1281 else if (is_active
) {
1282 d
->state
= (1<<MD_DISK_ACTIVE
);
1283 if (test_bit(In_sync
, &rdev2
->flags
))
1284 d
->state
|= (1<<MD_DISK_SYNC
);
1292 if (test_bit(WriteMostly
, &rdev2
->flags
))
1293 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1295 /* now set the "removed" and "faulty" bits on any missing devices */
1296 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1297 mdp_disk_t
*d
= &sb
->disks
[i
];
1298 if (d
->state
== 0 && d
->number
== 0) {
1301 d
->state
= (1<<MD_DISK_REMOVED
);
1302 d
->state
|= (1<<MD_DISK_FAULTY
);
1306 sb
->nr_disks
= nr_disks
;
1307 sb
->active_disks
= active
;
1308 sb
->working_disks
= working
;
1309 sb
->failed_disks
= failed
;
1310 sb
->spare_disks
= spare
;
1312 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1313 sb
->sb_csum
= calc_sb_csum(sb
);
1317 * rdev_size_change for 0.90.0
1319 static unsigned long long
1320 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1322 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1323 return 0; /* component must fit device */
1324 if (rdev
->mddev
->bitmap_info
.offset
)
1325 return 0; /* can't move bitmap */
1326 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1327 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1328 num_sectors
= rdev
->sb_start
;
1329 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1331 md_super_wait(rdev
->mddev
);
1332 return num_sectors
/ 2; /* kB for sysfs */
1337 * version 1 superblock
1340 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1344 unsigned long long newcsum
;
1345 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1346 __le32
*isuper
= (__le32
*)sb
;
1349 disk_csum
= sb
->sb_csum
;
1352 for (i
=0; size
>=4; size
-= 4 )
1353 newcsum
+= le32_to_cpu(*isuper
++);
1356 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1358 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1359 sb
->sb_csum
= disk_csum
;
1360 return cpu_to_le32(csum
);
1363 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1365 struct mdp_superblock_1
*sb
;
1368 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1372 * Calculate the position of the superblock in 512byte sectors.
1373 * It is always aligned to a 4K boundary and
1374 * depeding on minor_version, it can be:
1375 * 0: At least 8K, but less than 12K, from end of device
1376 * 1: At start of device
1377 * 2: 4K from start of device.
1379 switch(minor_version
) {
1381 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1383 sb_start
&= ~(sector_t
)(4*2-1);
1394 rdev
->sb_start
= sb_start
;
1396 /* superblock is rarely larger than 1K, but it can be larger,
1397 * and it is safe to read 4k, so we do that
1399 ret
= read_disk_sb(rdev
, 4096);
1400 if (ret
) return ret
;
1403 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1405 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1406 sb
->major_version
!= cpu_to_le32(1) ||
1407 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1408 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1409 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1412 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1413 printk("md: invalid superblock checksum on %s\n",
1414 bdevname(rdev
->bdev
,b
));
1417 if (le64_to_cpu(sb
->data_size
) < 10) {
1418 printk("md: data_size too small on %s\n",
1419 bdevname(rdev
->bdev
,b
));
1423 rdev
->preferred_minor
= 0xffff;
1424 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1425 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1427 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1428 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1429 if (rdev
->sb_size
& bmask
)
1430 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1433 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1436 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1439 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1445 struct mdp_superblock_1
*refsb
=
1446 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1448 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1449 sb
->level
!= refsb
->level
||
1450 sb
->layout
!= refsb
->layout
||
1451 sb
->chunksize
!= refsb
->chunksize
) {
1452 printk(KERN_WARNING
"md: %s has strangely different"
1453 " superblock to %s\n",
1454 bdevname(rdev
->bdev
,b
),
1455 bdevname(refdev
->bdev
,b2
));
1458 ev1
= le64_to_cpu(sb
->events
);
1459 ev2
= le64_to_cpu(refsb
->events
);
1467 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1468 le64_to_cpu(sb
->data_offset
);
1470 rdev
->sectors
= rdev
->sb_start
;
1471 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1473 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1474 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1479 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1481 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1482 __u64 ev1
= le64_to_cpu(sb
->events
);
1484 rdev
->raid_disk
= -1;
1485 clear_bit(Faulty
, &rdev
->flags
);
1486 clear_bit(In_sync
, &rdev
->flags
);
1487 clear_bit(WriteMostly
, &rdev
->flags
);
1488 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1490 if (mddev
->raid_disks
== 0) {
1491 mddev
->major_version
= 1;
1492 mddev
->patch_version
= 0;
1493 mddev
->external
= 0;
1494 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1495 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1496 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1497 mddev
->level
= le32_to_cpu(sb
->level
);
1498 mddev
->clevel
[0] = 0;
1499 mddev
->layout
= le32_to_cpu(sb
->layout
);
1500 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1501 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1502 mddev
->events
= ev1
;
1503 mddev
->bitmap_info
.offset
= 0;
1504 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1506 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1507 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1509 mddev
->max_disks
= (4096-256)/2;
1511 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1512 mddev
->bitmap_info
.file
== NULL
)
1513 mddev
->bitmap_info
.offset
=
1514 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1516 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1517 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1518 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1519 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1520 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1521 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1523 mddev
->reshape_position
= MaxSector
;
1524 mddev
->delta_disks
= 0;
1525 mddev
->new_level
= mddev
->level
;
1526 mddev
->new_layout
= mddev
->layout
;
1527 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1530 } else if (mddev
->pers
== NULL
) {
1531 /* Insist of good event counter while assembling, except for
1532 * spares (which don't need an event count) */
1534 if (rdev
->desc_nr
>= 0 &&
1535 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1536 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1537 if (ev1
< mddev
->events
)
1539 } else if (mddev
->bitmap
) {
1540 /* If adding to array with a bitmap, then we can accept an
1541 * older device, but not too old.
1543 if (ev1
< mddev
->bitmap
->events_cleared
)
1546 if (ev1
< mddev
->events
)
1547 /* just a hot-add of a new device, leave raid_disk at -1 */
1550 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1552 if (rdev
->desc_nr
< 0 ||
1553 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1557 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1559 case 0xffff: /* spare */
1561 case 0xfffe: /* faulty */
1562 set_bit(Faulty
, &rdev
->flags
);
1565 if ((le32_to_cpu(sb
->feature_map
) &
1566 MD_FEATURE_RECOVERY_OFFSET
))
1567 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1569 set_bit(In_sync
, &rdev
->flags
);
1570 rdev
->raid_disk
= role
;
1573 if (sb
->devflags
& WriteMostly1
)
1574 set_bit(WriteMostly
, &rdev
->flags
);
1575 } else /* MULTIPATH are always insync */
1576 set_bit(In_sync
, &rdev
->flags
);
1581 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1583 struct mdp_superblock_1
*sb
;
1586 /* make rdev->sb match mddev and rdev data. */
1588 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1590 sb
->feature_map
= 0;
1592 sb
->recovery_offset
= cpu_to_le64(0);
1593 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1594 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1595 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1597 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1598 sb
->events
= cpu_to_le64(mddev
->events
);
1600 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1602 sb
->resync_offset
= cpu_to_le64(0);
1604 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1606 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1607 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1608 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1609 sb
->level
= cpu_to_le32(mddev
->level
);
1610 sb
->layout
= cpu_to_le32(mddev
->layout
);
1612 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1613 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1614 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1617 if (rdev
->raid_disk
>= 0 &&
1618 !test_bit(In_sync
, &rdev
->flags
)) {
1620 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1621 sb
->recovery_offset
=
1622 cpu_to_le64(rdev
->recovery_offset
);
1625 if (mddev
->reshape_position
!= MaxSector
) {
1626 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1627 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1628 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1629 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1630 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1631 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1635 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1636 if (rdev2
->desc_nr
+1 > max_dev
)
1637 max_dev
= rdev2
->desc_nr
+1;
1639 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1641 sb
->max_dev
= cpu_to_le32(max_dev
);
1642 rdev
->sb_size
= max_dev
* 2 + 256;
1643 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1644 if (rdev
->sb_size
& bmask
)
1645 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1647 for (i
=0; i
<max_dev
;i
++)
1648 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1650 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1652 if (test_bit(Faulty
, &rdev2
->flags
))
1653 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1654 else if (test_bit(In_sync
, &rdev2
->flags
))
1655 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1656 else if (rdev2
->raid_disk
>= 0)
1657 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1659 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1662 sb
->sb_csum
= calc_sb_1_csum(sb
);
1665 static unsigned long long
1666 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1668 struct mdp_superblock_1
*sb
;
1669 sector_t max_sectors
;
1670 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1671 return 0; /* component must fit device */
1672 if (rdev
->sb_start
< rdev
->data_offset
) {
1673 /* minor versions 1 and 2; superblock before data */
1674 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1675 max_sectors
-= rdev
->data_offset
;
1676 if (!num_sectors
|| num_sectors
> max_sectors
)
1677 num_sectors
= max_sectors
;
1678 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1679 /* minor version 0 with bitmap we can't move */
1682 /* minor version 0; superblock after data */
1684 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1685 sb_start
&= ~(sector_t
)(4*2 - 1);
1686 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1687 if (!num_sectors
|| num_sectors
> max_sectors
)
1688 num_sectors
= max_sectors
;
1689 rdev
->sb_start
= sb_start
;
1691 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1692 sb
->data_size
= cpu_to_le64(num_sectors
);
1693 sb
->super_offset
= rdev
->sb_start
;
1694 sb
->sb_csum
= calc_sb_1_csum(sb
);
1695 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1697 md_super_wait(rdev
->mddev
);
1698 return num_sectors
/ 2; /* kB for sysfs */
1701 static struct super_type super_types
[] = {
1704 .owner
= THIS_MODULE
,
1705 .load_super
= super_90_load
,
1706 .validate_super
= super_90_validate
,
1707 .sync_super
= super_90_sync
,
1708 .rdev_size_change
= super_90_rdev_size_change
,
1712 .owner
= THIS_MODULE
,
1713 .load_super
= super_1_load
,
1714 .validate_super
= super_1_validate
,
1715 .sync_super
= super_1_sync
,
1716 .rdev_size_change
= super_1_rdev_size_change
,
1720 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1722 mdk_rdev_t
*rdev
, *rdev2
;
1725 rdev_for_each_rcu(rdev
, mddev1
)
1726 rdev_for_each_rcu(rdev2
, mddev2
)
1727 if (rdev
->bdev
->bd_contains
==
1728 rdev2
->bdev
->bd_contains
) {
1736 static LIST_HEAD(pending_raid_disks
);
1739 * Try to register data integrity profile for an mddev
1741 * This is called when an array is started and after a disk has been kicked
1742 * from the array. It only succeeds if all working and active component devices
1743 * are integrity capable with matching profiles.
1745 int md_integrity_register(mddev_t
*mddev
)
1747 mdk_rdev_t
*rdev
, *reference
= NULL
;
1749 if (list_empty(&mddev
->disks
))
1750 return 0; /* nothing to do */
1751 if (blk_get_integrity(mddev
->gendisk
))
1752 return 0; /* already registered */
1753 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1754 /* skip spares and non-functional disks */
1755 if (test_bit(Faulty
, &rdev
->flags
))
1757 if (rdev
->raid_disk
< 0)
1760 * If at least one rdev is not integrity capable, we can not
1761 * enable data integrity for the md device.
1763 if (!bdev_get_integrity(rdev
->bdev
))
1766 /* Use the first rdev as the reference */
1770 /* does this rdev's profile match the reference profile? */
1771 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1772 rdev
->bdev
->bd_disk
) < 0)
1776 * All component devices are integrity capable and have matching
1777 * profiles, register the common profile for the md device.
1779 if (blk_integrity_register(mddev
->gendisk
,
1780 bdev_get_integrity(reference
->bdev
)) != 0) {
1781 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1785 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1789 EXPORT_SYMBOL(md_integrity_register
);
1791 /* Disable data integrity if non-capable/non-matching disk is being added */
1792 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1794 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1795 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1797 if (!bi_mddev
) /* nothing to do */
1799 if (rdev
->raid_disk
< 0) /* skip spares */
1801 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1802 rdev
->bdev
->bd_disk
) >= 0)
1804 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1805 blk_integrity_unregister(mddev
->gendisk
);
1807 EXPORT_SYMBOL(md_integrity_add_rdev
);
1809 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1811 char b
[BDEVNAME_SIZE
];
1821 /* prevent duplicates */
1822 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1825 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1826 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1827 rdev
->sectors
< mddev
->dev_sectors
)) {
1829 /* Cannot change size, so fail
1830 * If mddev->level <= 0, then we don't care
1831 * about aligning sizes (e.g. linear)
1833 if (mddev
->level
> 0)
1836 mddev
->dev_sectors
= rdev
->sectors
;
1839 /* Verify rdev->desc_nr is unique.
1840 * If it is -1, assign a free number, else
1841 * check number is not in use
1843 if (rdev
->desc_nr
< 0) {
1845 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1846 while (find_rdev_nr(mddev
, choice
))
1848 rdev
->desc_nr
= choice
;
1850 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1853 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1854 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1855 mdname(mddev
), mddev
->max_disks
);
1858 bdevname(rdev
->bdev
,b
);
1859 while ( (s
=strchr(b
, '/')) != NULL
)
1862 rdev
->mddev
= mddev
;
1863 printk(KERN_INFO
"md: bind<%s>\n", b
);
1865 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1868 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1869 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1870 /* failure here is OK */;
1871 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1873 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1874 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1876 /* May as well allow recovery to be retried once */
1877 mddev
->recovery_disabled
= 0;
1882 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1887 static void md_delayed_delete(struct work_struct
*ws
)
1889 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1890 kobject_del(&rdev
->kobj
);
1891 kobject_put(&rdev
->kobj
);
1894 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1896 char b
[BDEVNAME_SIZE
];
1901 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1902 list_del_rcu(&rdev
->same_set
);
1903 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1905 sysfs_remove_link(&rdev
->kobj
, "block");
1906 sysfs_put(rdev
->sysfs_state
);
1907 rdev
->sysfs_state
= NULL
;
1908 /* We need to delay this, otherwise we can deadlock when
1909 * writing to 'remove' to "dev/state". We also need
1910 * to delay it due to rcu usage.
1913 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1914 kobject_get(&rdev
->kobj
);
1915 schedule_work(&rdev
->del_work
);
1919 * prevent the device from being mounted, repartitioned or
1920 * otherwise reused by a RAID array (or any other kernel
1921 * subsystem), by bd_claiming the device.
1923 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1926 struct block_device
*bdev
;
1927 char b
[BDEVNAME_SIZE
];
1929 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1931 printk(KERN_ERR
"md: could not open %s.\n",
1932 __bdevname(dev
, b
));
1933 return PTR_ERR(bdev
);
1935 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1937 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1939 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1943 set_bit(AllReserved
, &rdev
->flags
);
1948 static void unlock_rdev(mdk_rdev_t
*rdev
)
1950 struct block_device
*bdev
= rdev
->bdev
;
1955 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1958 void md_autodetect_dev(dev_t dev
);
1960 static void export_rdev(mdk_rdev_t
* rdev
)
1962 char b
[BDEVNAME_SIZE
];
1963 printk(KERN_INFO
"md: export_rdev(%s)\n",
1964 bdevname(rdev
->bdev
,b
));
1969 if (test_bit(AutoDetected
, &rdev
->flags
))
1970 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1973 kobject_put(&rdev
->kobj
);
1976 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1978 unbind_rdev_from_array(rdev
);
1982 static void export_array(mddev_t
*mddev
)
1984 mdk_rdev_t
*rdev
, *tmp
;
1986 rdev_for_each(rdev
, tmp
, mddev
) {
1991 kick_rdev_from_array(rdev
);
1993 if (!list_empty(&mddev
->disks
))
1995 mddev
->raid_disks
= 0;
1996 mddev
->major_version
= 0;
1999 static void print_desc(mdp_disk_t
*desc
)
2001 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2002 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2005 static void print_sb_90(mdp_super_t
*sb
)
2010 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2011 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2012 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2014 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2015 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2016 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2017 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2018 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2019 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2020 sb
->failed_disks
, sb
->spare_disks
,
2021 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2024 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2027 desc
= sb
->disks
+ i
;
2028 if (desc
->number
|| desc
->major
|| desc
->minor
||
2029 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2030 printk(" D %2d: ", i
);
2034 printk(KERN_INFO
"md: THIS: ");
2035 print_desc(&sb
->this_disk
);
2038 static void print_sb_1(struct mdp_superblock_1
*sb
)
2042 uuid
= sb
->set_uuid
;
2044 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2045 "md: Name: \"%s\" CT:%llu\n",
2046 le32_to_cpu(sb
->major_version
),
2047 le32_to_cpu(sb
->feature_map
),
2050 (unsigned long long)le64_to_cpu(sb
->ctime
)
2051 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2053 uuid
= sb
->device_uuid
;
2055 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2057 "md: Dev:%08x UUID: %pU\n"
2058 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2059 "md: (MaxDev:%u) \n",
2060 le32_to_cpu(sb
->level
),
2061 (unsigned long long)le64_to_cpu(sb
->size
),
2062 le32_to_cpu(sb
->raid_disks
),
2063 le32_to_cpu(sb
->layout
),
2064 le32_to_cpu(sb
->chunksize
),
2065 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2066 (unsigned long long)le64_to_cpu(sb
->data_size
),
2067 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2068 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2069 le32_to_cpu(sb
->dev_number
),
2072 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2073 (unsigned long long)le64_to_cpu(sb
->events
),
2074 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2075 le32_to_cpu(sb
->sb_csum
),
2076 le32_to_cpu(sb
->max_dev
)
2080 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2082 char b
[BDEVNAME_SIZE
];
2083 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2084 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2085 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2087 if (rdev
->sb_loaded
) {
2088 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2089 switch (major_version
) {
2091 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2094 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2098 printk(KERN_INFO
"md: no rdev superblock!\n");
2101 static void md_print_devices(void)
2103 struct list_head
*tmp
;
2106 char b
[BDEVNAME_SIZE
];
2109 printk("md: **********************************\n");
2110 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2111 printk("md: **********************************\n");
2112 for_each_mddev(mddev
, tmp
) {
2115 bitmap_print_sb(mddev
->bitmap
);
2117 printk("%s: ", mdname(mddev
));
2118 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2119 printk("<%s>", bdevname(rdev
->bdev
,b
));
2122 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2123 print_rdev(rdev
, mddev
->major_version
);
2125 printk("md: **********************************\n");
2130 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2132 /* Update each superblock (in-memory image), but
2133 * if we are allowed to, skip spares which already
2134 * have the right event counter, or have one earlier
2135 * (which would mean they aren't being marked as dirty
2136 * with the rest of the array)
2139 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2140 if (rdev
->sb_events
== mddev
->events
||
2142 rdev
->raid_disk
< 0 &&
2143 rdev
->sb_events
+1 == mddev
->events
)) {
2144 /* Don't update this superblock */
2145 rdev
->sb_loaded
= 2;
2147 super_types
[mddev
->major_version
].
2148 sync_super(mddev
, rdev
);
2149 rdev
->sb_loaded
= 1;
2154 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2161 /* First make sure individual recovery_offsets are correct */
2162 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2163 if (rdev
->raid_disk
>= 0 &&
2164 mddev
->delta_disks
>= 0 &&
2165 !test_bit(In_sync
, &rdev
->flags
) &&
2166 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2167 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2170 if (!mddev
->persistent
) {
2171 if (!mddev
->external
)
2172 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2173 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2174 wake_up(&mddev
->sb_wait
);
2178 spin_lock_irq(&mddev
->write_lock
);
2180 mddev
->utime
= get_seconds();
2182 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2183 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2185 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2186 /* just a clean<-> dirty transition, possibly leave spares alone,
2187 * though if events isn't the right even/odd, we will have to do
2193 if (mddev
->degraded
)
2194 /* If the array is degraded, then skipping spares is both
2195 * dangerous and fairly pointless.
2196 * Dangerous because a device that was removed from the array
2197 * might have a event_count that still looks up-to-date,
2198 * so it can be re-added without a resync.
2199 * Pointless because if there are any spares to skip,
2200 * then a recovery will happen and soon that array won't
2201 * be degraded any more and the spare can go back to sleep then.
2205 sync_req
= mddev
->in_sync
;
2207 /* If this is just a dirty<->clean transition, and the array is clean
2208 * and 'events' is odd, we can roll back to the previous clean state */
2210 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2211 && mddev
->can_decrease_events
2212 && mddev
->events
!= 1) {
2214 mddev
->can_decrease_events
= 0;
2216 /* otherwise we have to go forward and ... */
2218 mddev
->can_decrease_events
= nospares
;
2221 if (!mddev
->events
) {
2223 * oops, this 64-bit counter should never wrap.
2224 * Either we are in around ~1 trillion A.C., assuming
2225 * 1 reboot per second, or we have a bug:
2230 sync_sbs(mddev
, nospares
);
2231 spin_unlock_irq(&mddev
->write_lock
);
2234 "md: updating %s RAID superblock on device (in sync %d)\n",
2235 mdname(mddev
),mddev
->in_sync
);
2237 bitmap_update_sb(mddev
->bitmap
);
2238 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2239 char b
[BDEVNAME_SIZE
];
2240 dprintk(KERN_INFO
"md: ");
2241 if (rdev
->sb_loaded
!= 1)
2242 continue; /* no noise on spare devices */
2243 if (test_bit(Faulty
, &rdev
->flags
))
2244 dprintk("(skipping faulty ");
2246 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2247 if (!test_bit(Faulty
, &rdev
->flags
)) {
2248 md_super_write(mddev
,rdev
,
2249 rdev
->sb_start
, rdev
->sb_size
,
2251 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2252 bdevname(rdev
->bdev
,b
),
2253 (unsigned long long)rdev
->sb_start
);
2254 rdev
->sb_events
= mddev
->events
;
2258 if (mddev
->level
== LEVEL_MULTIPATH
)
2259 /* only need to write one superblock... */
2262 md_super_wait(mddev
);
2263 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2265 spin_lock_irq(&mddev
->write_lock
);
2266 if (mddev
->in_sync
!= sync_req
||
2267 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2268 /* have to write it out again */
2269 spin_unlock_irq(&mddev
->write_lock
);
2272 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2273 spin_unlock_irq(&mddev
->write_lock
);
2274 wake_up(&mddev
->sb_wait
);
2275 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2276 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2280 /* words written to sysfs files may, or may not, be \n terminated.
2281 * We want to accept with case. For this we use cmd_match.
2283 static int cmd_match(const char *cmd
, const char *str
)
2285 /* See if cmd, written into a sysfs file, matches
2286 * str. They must either be the same, or cmd can
2287 * have a trailing newline
2289 while (*cmd
&& *str
&& *cmd
== *str
) {
2300 struct rdev_sysfs_entry
{
2301 struct attribute attr
;
2302 ssize_t (*show
)(mdk_rdev_t
*, char *);
2303 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2307 state_show(mdk_rdev_t
*rdev
, char *page
)
2312 if (test_bit(Faulty
, &rdev
->flags
)) {
2313 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2316 if (test_bit(In_sync
, &rdev
->flags
)) {
2317 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2320 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2321 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2324 if (test_bit(Blocked
, &rdev
->flags
)) {
2325 len
+= sprintf(page
+len
, "%sblocked", sep
);
2328 if (!test_bit(Faulty
, &rdev
->flags
) &&
2329 !test_bit(In_sync
, &rdev
->flags
)) {
2330 len
+= sprintf(page
+len
, "%sspare", sep
);
2333 return len
+sprintf(page
+len
, "\n");
2337 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2340 * faulty - simulates and error
2341 * remove - disconnects the device
2342 * writemostly - sets write_mostly
2343 * -writemostly - clears write_mostly
2344 * blocked - sets the Blocked flag
2345 * -blocked - clears the Blocked flag
2346 * insync - sets Insync providing device isn't active
2349 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2350 md_error(rdev
->mddev
, rdev
);
2352 } else if (cmd_match(buf
, "remove")) {
2353 if (rdev
->raid_disk
>= 0)
2356 mddev_t
*mddev
= rdev
->mddev
;
2357 kick_rdev_from_array(rdev
);
2359 md_update_sb(mddev
, 1);
2360 md_new_event(mddev
);
2363 } else if (cmd_match(buf
, "writemostly")) {
2364 set_bit(WriteMostly
, &rdev
->flags
);
2366 } else if (cmd_match(buf
, "-writemostly")) {
2367 clear_bit(WriteMostly
, &rdev
->flags
);
2369 } else if (cmd_match(buf
, "blocked")) {
2370 set_bit(Blocked
, &rdev
->flags
);
2372 } else if (cmd_match(buf
, "-blocked")) {
2373 clear_bit(Blocked
, &rdev
->flags
);
2374 wake_up(&rdev
->blocked_wait
);
2375 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2376 md_wakeup_thread(rdev
->mddev
->thread
);
2379 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2380 set_bit(In_sync
, &rdev
->flags
);
2384 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2385 return err
? err
: len
;
2387 static struct rdev_sysfs_entry rdev_state
=
2388 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2391 errors_show(mdk_rdev_t
*rdev
, char *page
)
2393 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2397 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2400 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2401 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2402 atomic_set(&rdev
->corrected_errors
, n
);
2407 static struct rdev_sysfs_entry rdev_errors
=
2408 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2411 slot_show(mdk_rdev_t
*rdev
, char *page
)
2413 if (rdev
->raid_disk
< 0)
2414 return sprintf(page
, "none\n");
2416 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2420 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2425 int slot
= simple_strtoul(buf
, &e
, 10);
2426 if (strncmp(buf
, "none", 4)==0)
2428 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2430 if (rdev
->mddev
->pers
&& slot
== -1) {
2431 /* Setting 'slot' on an active array requires also
2432 * updating the 'rd%d' link, and communicating
2433 * with the personality with ->hot_*_disk.
2434 * For now we only support removing
2435 * failed/spare devices. This normally happens automatically,
2436 * but not when the metadata is externally managed.
2438 if (rdev
->raid_disk
== -1)
2440 /* personality does all needed checks */
2441 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2443 err
= rdev
->mddev
->pers
->
2444 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2447 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2448 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2449 rdev
->raid_disk
= -1;
2450 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2451 md_wakeup_thread(rdev
->mddev
->thread
);
2452 } else if (rdev
->mddev
->pers
) {
2454 /* Activating a spare .. or possibly reactivating
2455 * if we ever get bitmaps working here.
2458 if (rdev
->raid_disk
!= -1)
2461 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2464 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2465 if (rdev2
->raid_disk
== slot
)
2468 rdev
->raid_disk
= slot
;
2469 if (test_bit(In_sync
, &rdev
->flags
))
2470 rdev
->saved_raid_disk
= slot
;
2472 rdev
->saved_raid_disk
= -1;
2473 err
= rdev
->mddev
->pers
->
2474 hot_add_disk(rdev
->mddev
, rdev
);
2476 rdev
->raid_disk
= -1;
2479 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2480 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2481 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2482 /* failure here is OK */;
2483 /* don't wakeup anyone, leave that to userspace. */
2485 if (slot
>= rdev
->mddev
->raid_disks
)
2487 rdev
->raid_disk
= slot
;
2488 /* assume it is working */
2489 clear_bit(Faulty
, &rdev
->flags
);
2490 clear_bit(WriteMostly
, &rdev
->flags
);
2491 set_bit(In_sync
, &rdev
->flags
);
2492 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2498 static struct rdev_sysfs_entry rdev_slot
=
2499 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2502 offset_show(mdk_rdev_t
*rdev
, char *page
)
2504 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2508 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2511 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2512 if (e
==buf
|| (*e
&& *e
!= '\n'))
2514 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2516 if (rdev
->sectors
&& rdev
->mddev
->external
)
2517 /* Must set offset before size, so overlap checks
2520 rdev
->data_offset
= offset
;
2524 static struct rdev_sysfs_entry rdev_offset
=
2525 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2528 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2530 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2533 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2535 /* check if two start/length pairs overlap */
2543 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2545 unsigned long long blocks
;
2548 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2551 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2552 return -EINVAL
; /* sector conversion overflow */
2555 if (new != blocks
* 2)
2556 return -EINVAL
; /* unsigned long long to sector_t overflow */
2563 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2565 mddev_t
*my_mddev
= rdev
->mddev
;
2566 sector_t oldsectors
= rdev
->sectors
;
2569 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2571 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2572 if (my_mddev
->persistent
) {
2573 sectors
= super_types
[my_mddev
->major_version
].
2574 rdev_size_change(rdev
, sectors
);
2577 } else if (!sectors
)
2578 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2581 if (sectors
< my_mddev
->dev_sectors
)
2582 return -EINVAL
; /* component must fit device */
2584 rdev
->sectors
= sectors
;
2585 if (sectors
> oldsectors
&& my_mddev
->external
) {
2586 /* need to check that all other rdevs with the same ->bdev
2587 * do not overlap. We need to unlock the mddev to avoid
2588 * a deadlock. We have already changed rdev->sectors, and if
2589 * we have to change it back, we will have the lock again.
2593 struct list_head
*tmp
;
2595 mddev_unlock(my_mddev
);
2596 for_each_mddev(mddev
, tmp
) {
2600 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2601 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2602 (rdev
->bdev
== rdev2
->bdev
&&
2604 overlaps(rdev
->data_offset
, rdev
->sectors
,
2610 mddev_unlock(mddev
);
2616 mddev_lock(my_mddev
);
2618 /* Someone else could have slipped in a size
2619 * change here, but doing so is just silly.
2620 * We put oldsectors back because we *know* it is
2621 * safe, and trust userspace not to race with
2624 rdev
->sectors
= oldsectors
;
2631 static struct rdev_sysfs_entry rdev_size
=
2632 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2635 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2637 unsigned long long recovery_start
= rdev
->recovery_offset
;
2639 if (test_bit(In_sync
, &rdev
->flags
) ||
2640 recovery_start
== MaxSector
)
2641 return sprintf(page
, "none\n");
2643 return sprintf(page
, "%llu\n", recovery_start
);
2646 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2648 unsigned long long recovery_start
;
2650 if (cmd_match(buf
, "none"))
2651 recovery_start
= MaxSector
;
2652 else if (strict_strtoull(buf
, 10, &recovery_start
))
2655 if (rdev
->mddev
->pers
&&
2656 rdev
->raid_disk
>= 0)
2659 rdev
->recovery_offset
= recovery_start
;
2660 if (recovery_start
== MaxSector
)
2661 set_bit(In_sync
, &rdev
->flags
);
2663 clear_bit(In_sync
, &rdev
->flags
);
2667 static struct rdev_sysfs_entry rdev_recovery_start
=
2668 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2670 static struct attribute
*rdev_default_attrs
[] = {
2676 &rdev_recovery_start
.attr
,
2680 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2682 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2683 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2684 mddev_t
*mddev
= rdev
->mddev
;
2690 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2692 if (rdev
->mddev
== NULL
)
2695 rv
= entry
->show(rdev
, page
);
2696 mddev_unlock(mddev
);
2702 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2703 const char *page
, size_t length
)
2705 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2706 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2708 mddev_t
*mddev
= rdev
->mddev
;
2712 if (!capable(CAP_SYS_ADMIN
))
2714 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2716 if (rdev
->mddev
== NULL
)
2719 rv
= entry
->store(rdev
, page
, length
);
2720 mddev_unlock(mddev
);
2725 static void rdev_free(struct kobject
*ko
)
2727 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2730 static const struct sysfs_ops rdev_sysfs_ops
= {
2731 .show
= rdev_attr_show
,
2732 .store
= rdev_attr_store
,
2734 static struct kobj_type rdev_ktype
= {
2735 .release
= rdev_free
,
2736 .sysfs_ops
= &rdev_sysfs_ops
,
2737 .default_attrs
= rdev_default_attrs
,
2740 void md_rdev_init(mdk_rdev_t
*rdev
)
2743 rdev
->saved_raid_disk
= -1;
2744 rdev
->raid_disk
= -1;
2746 rdev
->data_offset
= 0;
2747 rdev
->sb_events
= 0;
2748 rdev
->last_read_error
.tv_sec
= 0;
2749 rdev
->last_read_error
.tv_nsec
= 0;
2750 atomic_set(&rdev
->nr_pending
, 0);
2751 atomic_set(&rdev
->read_errors
, 0);
2752 atomic_set(&rdev
->corrected_errors
, 0);
2754 INIT_LIST_HEAD(&rdev
->same_set
);
2755 init_waitqueue_head(&rdev
->blocked_wait
);
2757 EXPORT_SYMBOL_GPL(md_rdev_init
);
2759 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2761 * mark the device faulty if:
2763 * - the device is nonexistent (zero size)
2764 * - the device has no valid superblock
2766 * a faulty rdev _never_ has rdev->sb set.
2768 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2770 char b
[BDEVNAME_SIZE
];
2775 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2777 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2778 return ERR_PTR(-ENOMEM
);
2782 if ((err
= alloc_disk_sb(rdev
)))
2785 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2789 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2791 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2794 "md: %s has zero or unknown size, marking faulty!\n",
2795 bdevname(rdev
->bdev
,b
));
2800 if (super_format
>= 0) {
2801 err
= super_types
[super_format
].
2802 load_super(rdev
, NULL
, super_minor
);
2803 if (err
== -EINVAL
) {
2805 "md: %s does not have a valid v%d.%d "
2806 "superblock, not importing!\n",
2807 bdevname(rdev
->bdev
,b
),
2808 super_format
, super_minor
);
2813 "md: could not read %s's sb, not importing!\n",
2814 bdevname(rdev
->bdev
,b
));
2822 if (rdev
->sb_page
) {
2828 return ERR_PTR(err
);
2832 * Check a full RAID array for plausibility
2836 static void analyze_sbs(mddev_t
* mddev
)
2839 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2840 char b
[BDEVNAME_SIZE
];
2843 rdev_for_each(rdev
, tmp
, mddev
)
2844 switch (super_types
[mddev
->major_version
].
2845 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2853 "md: fatal superblock inconsistency in %s"
2854 " -- removing from array\n",
2855 bdevname(rdev
->bdev
,b
));
2856 kick_rdev_from_array(rdev
);
2860 super_types
[mddev
->major_version
].
2861 validate_super(mddev
, freshest
);
2864 rdev_for_each(rdev
, tmp
, mddev
) {
2865 if (mddev
->max_disks
&&
2866 (rdev
->desc_nr
>= mddev
->max_disks
||
2867 i
> mddev
->max_disks
)) {
2869 "md: %s: %s: only %d devices permitted\n",
2870 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2872 kick_rdev_from_array(rdev
);
2875 if (rdev
!= freshest
)
2876 if (super_types
[mddev
->major_version
].
2877 validate_super(mddev
, rdev
)) {
2878 printk(KERN_WARNING
"md: kicking non-fresh %s"
2880 bdevname(rdev
->bdev
,b
));
2881 kick_rdev_from_array(rdev
);
2884 if (mddev
->level
== LEVEL_MULTIPATH
) {
2885 rdev
->desc_nr
= i
++;
2886 rdev
->raid_disk
= rdev
->desc_nr
;
2887 set_bit(In_sync
, &rdev
->flags
);
2888 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2889 rdev
->raid_disk
= -1;
2890 clear_bit(In_sync
, &rdev
->flags
);
2895 /* Read a fixed-point number.
2896 * Numbers in sysfs attributes should be in "standard" units where
2897 * possible, so time should be in seconds.
2898 * However we internally use a a much smaller unit such as
2899 * milliseconds or jiffies.
2900 * This function takes a decimal number with a possible fractional
2901 * component, and produces an integer which is the result of
2902 * multiplying that number by 10^'scale'.
2903 * all without any floating-point arithmetic.
2905 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2907 unsigned long result
= 0;
2909 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2912 else if (decimals
< scale
) {
2915 result
= result
* 10 + value
;
2927 while (decimals
< scale
) {
2936 static void md_safemode_timeout(unsigned long data
);
2939 safe_delay_show(mddev_t
*mddev
, char *page
)
2941 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2942 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2945 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2949 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2952 mddev
->safemode_delay
= 0;
2954 unsigned long old_delay
= mddev
->safemode_delay
;
2955 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2956 if (mddev
->safemode_delay
== 0)
2957 mddev
->safemode_delay
= 1;
2958 if (mddev
->safemode_delay
< old_delay
)
2959 md_safemode_timeout((unsigned long)mddev
);
2963 static struct md_sysfs_entry md_safe_delay
=
2964 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2967 level_show(mddev_t
*mddev
, char *page
)
2969 struct mdk_personality
*p
= mddev
->pers
;
2971 return sprintf(page
, "%s\n", p
->name
);
2972 else if (mddev
->clevel
[0])
2973 return sprintf(page
, "%s\n", mddev
->clevel
);
2974 else if (mddev
->level
!= LEVEL_NONE
)
2975 return sprintf(page
, "%d\n", mddev
->level
);
2981 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2985 struct mdk_personality
*pers
;
2990 if (mddev
->pers
== NULL
) {
2993 if (len
>= sizeof(mddev
->clevel
))
2995 strncpy(mddev
->clevel
, buf
, len
);
2996 if (mddev
->clevel
[len
-1] == '\n')
2998 mddev
->clevel
[len
] = 0;
2999 mddev
->level
= LEVEL_NONE
;
3003 /* request to change the personality. Need to ensure:
3004 * - array is not engaged in resync/recovery/reshape
3005 * - old personality can be suspended
3006 * - new personality will access other array.
3009 if (mddev
->sync_thread
||
3010 mddev
->reshape_position
!= MaxSector
||
3011 mddev
->sysfs_active
)
3014 if (!mddev
->pers
->quiesce
) {
3015 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3016 mdname(mddev
), mddev
->pers
->name
);
3020 /* Now find the new personality */
3021 if (len
== 0 || len
>= sizeof(clevel
))
3023 strncpy(clevel
, buf
, len
);
3024 if (clevel
[len
-1] == '\n')
3027 if (strict_strtol(clevel
, 10, &level
))
3030 if (request_module("md-%s", clevel
) != 0)
3031 request_module("md-level-%s", clevel
);
3032 spin_lock(&pers_lock
);
3033 pers
= find_pers(level
, clevel
);
3034 if (!pers
|| !try_module_get(pers
->owner
)) {
3035 spin_unlock(&pers_lock
);
3036 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3039 spin_unlock(&pers_lock
);
3041 if (pers
== mddev
->pers
) {
3042 /* Nothing to do! */
3043 module_put(pers
->owner
);
3046 if (!pers
->takeover
) {
3047 module_put(pers
->owner
);
3048 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3049 mdname(mddev
), clevel
);
3053 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3054 rdev
->new_raid_disk
= rdev
->raid_disk
;
3056 /* ->takeover must set new_* and/or delta_disks
3057 * if it succeeds, and may set them when it fails.
3059 priv
= pers
->takeover(mddev
);
3061 mddev
->new_level
= mddev
->level
;
3062 mddev
->new_layout
= mddev
->layout
;
3063 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3064 mddev
->raid_disks
-= mddev
->delta_disks
;
3065 mddev
->delta_disks
= 0;
3066 module_put(pers
->owner
);
3067 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3068 mdname(mddev
), clevel
);
3069 return PTR_ERR(priv
);
3072 /* Looks like we have a winner */
3073 mddev_suspend(mddev
);
3074 mddev
->pers
->stop(mddev
);
3076 if (mddev
->pers
->sync_request
== NULL
&&
3077 pers
->sync_request
!= NULL
) {
3078 /* need to add the md_redundancy_group */
3079 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3081 "md: cannot register extra attributes for %s\n",
3083 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3085 if (mddev
->pers
->sync_request
!= NULL
&&
3086 pers
->sync_request
== NULL
) {
3087 /* need to remove the md_redundancy_group */
3088 if (mddev
->to_remove
== NULL
)
3089 mddev
->to_remove
= &md_redundancy_group
;
3092 if (mddev
->pers
->sync_request
== NULL
&&
3094 /* We are converting from a no-redundancy array
3095 * to a redundancy array and metadata is managed
3096 * externally so we need to be sure that writes
3097 * won't block due to a need to transition
3099 * until external management is started.
3102 mddev
->safemode_delay
= 0;
3103 mddev
->safemode
= 0;
3106 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3108 if (rdev
->raid_disk
< 0)
3110 if (rdev
->new_raid_disk
> mddev
->raid_disks
)
3111 rdev
->new_raid_disk
= -1;
3112 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3114 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3115 sysfs_remove_link(&mddev
->kobj
, nm
);
3117 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3118 if (rdev
->raid_disk
< 0)
3120 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3122 rdev
->raid_disk
= rdev
->new_raid_disk
;
3123 if (rdev
->raid_disk
< 0)
3124 clear_bit(In_sync
, &rdev
->flags
);
3127 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3128 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3129 printk("md: cannot register %s for %s after level change\n",
3134 module_put(mddev
->pers
->owner
);
3136 mddev
->private = priv
;
3137 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3138 mddev
->level
= mddev
->new_level
;
3139 mddev
->layout
= mddev
->new_layout
;
3140 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3141 mddev
->delta_disks
= 0;
3142 if (mddev
->pers
->sync_request
== NULL
) {
3143 /* this is now an array without redundancy, so
3144 * it must always be in_sync
3147 del_timer_sync(&mddev
->safemode_timer
);
3150 mddev_resume(mddev
);
3151 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3152 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3153 md_wakeup_thread(mddev
->thread
);
3154 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3155 md_new_event(mddev
);
3159 static struct md_sysfs_entry md_level
=
3160 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3164 layout_show(mddev_t
*mddev
, char *page
)
3166 /* just a number, not meaningful for all levels */
3167 if (mddev
->reshape_position
!= MaxSector
&&
3168 mddev
->layout
!= mddev
->new_layout
)
3169 return sprintf(page
, "%d (%d)\n",
3170 mddev
->new_layout
, mddev
->layout
);
3171 return sprintf(page
, "%d\n", mddev
->layout
);
3175 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3178 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3180 if (!*buf
|| (*e
&& *e
!= '\n'))
3185 if (mddev
->pers
->check_reshape
== NULL
)
3187 mddev
->new_layout
= n
;
3188 err
= mddev
->pers
->check_reshape(mddev
);
3190 mddev
->new_layout
= mddev
->layout
;
3194 mddev
->new_layout
= n
;
3195 if (mddev
->reshape_position
== MaxSector
)
3200 static struct md_sysfs_entry md_layout
=
3201 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3205 raid_disks_show(mddev_t
*mddev
, char *page
)
3207 if (mddev
->raid_disks
== 0)
3209 if (mddev
->reshape_position
!= MaxSector
&&
3210 mddev
->delta_disks
!= 0)
3211 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3212 mddev
->raid_disks
- mddev
->delta_disks
);
3213 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3216 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3219 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3223 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3225 if (!*buf
|| (*e
&& *e
!= '\n'))
3229 rv
= update_raid_disks(mddev
, n
);
3230 else if (mddev
->reshape_position
!= MaxSector
) {
3231 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3232 mddev
->delta_disks
= n
- olddisks
;
3233 mddev
->raid_disks
= n
;
3235 mddev
->raid_disks
= n
;
3236 return rv
? rv
: len
;
3238 static struct md_sysfs_entry md_raid_disks
=
3239 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3242 chunk_size_show(mddev_t
*mddev
, char *page
)
3244 if (mddev
->reshape_position
!= MaxSector
&&
3245 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3246 return sprintf(page
, "%d (%d)\n",
3247 mddev
->new_chunk_sectors
<< 9,
3248 mddev
->chunk_sectors
<< 9);
3249 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3253 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3256 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3258 if (!*buf
|| (*e
&& *e
!= '\n'))
3263 if (mddev
->pers
->check_reshape
== NULL
)
3265 mddev
->new_chunk_sectors
= n
>> 9;
3266 err
= mddev
->pers
->check_reshape(mddev
);
3268 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3272 mddev
->new_chunk_sectors
= n
>> 9;
3273 if (mddev
->reshape_position
== MaxSector
)
3274 mddev
->chunk_sectors
= n
>> 9;
3278 static struct md_sysfs_entry md_chunk_size
=
3279 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3282 resync_start_show(mddev_t
*mddev
, char *page
)
3284 if (mddev
->recovery_cp
== MaxSector
)
3285 return sprintf(page
, "none\n");
3286 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3290 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3293 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3297 if (cmd_match(buf
, "none"))
3299 else if (!*buf
|| (*e
&& *e
!= '\n'))
3302 mddev
->recovery_cp
= n
;
3305 static struct md_sysfs_entry md_resync_start
=
3306 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3309 * The array state can be:
3312 * No devices, no size, no level
3313 * Equivalent to STOP_ARRAY ioctl
3315 * May have some settings, but array is not active
3316 * all IO results in error
3317 * When written, doesn't tear down array, but just stops it
3318 * suspended (not supported yet)
3319 * All IO requests will block. The array can be reconfigured.
3320 * Writing this, if accepted, will block until array is quiescent
3322 * no resync can happen. no superblocks get written.
3323 * write requests fail
3325 * like readonly, but behaves like 'clean' on a write request.
3327 * clean - no pending writes, but otherwise active.
3328 * When written to inactive array, starts without resync
3329 * If a write request arrives then
3330 * if metadata is known, mark 'dirty' and switch to 'active'.
3331 * if not known, block and switch to write-pending
3332 * If written to an active array that has pending writes, then fails.
3334 * fully active: IO and resync can be happening.
3335 * When written to inactive array, starts with resync
3338 * clean, but writes are blocked waiting for 'active' to be written.
3341 * like active, but no writes have been seen for a while (100msec).
3344 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3345 write_pending
, active_idle
, bad_word
};
3346 static char *array_states
[] = {
3347 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3348 "write-pending", "active-idle", NULL
};
3350 static int match_word(const char *word
, char **list
)
3353 for (n
=0; list
[n
]; n
++)
3354 if (cmd_match(word
, list
[n
]))
3360 array_state_show(mddev_t
*mddev
, char *page
)
3362 enum array_state st
= inactive
;
3375 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
3377 else if (mddev
->safemode
)
3383 if (list_empty(&mddev
->disks
) &&
3384 mddev
->raid_disks
== 0 &&
3385 mddev
->dev_sectors
== 0)
3390 return sprintf(page
, "%s\n", array_states
[st
]);
3393 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3394 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3395 static int do_md_run(mddev_t
* mddev
);
3396 static int restart_array(mddev_t
*mddev
);
3399 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3402 enum array_state st
= match_word(buf
, array_states
);
3407 /* stopping an active array */
3408 if (atomic_read(&mddev
->openers
) > 0)
3410 err
= do_md_stop(mddev
, 0, 0);
3413 /* stopping an active array */
3415 if (atomic_read(&mddev
->openers
) > 0)
3417 err
= do_md_stop(mddev
, 2, 0);
3419 err
= 0; /* already inactive */
3422 break; /* not supported yet */
3425 err
= md_set_readonly(mddev
, 0);
3428 set_disk_ro(mddev
->gendisk
, 1);
3429 err
= do_md_run(mddev
);
3435 err
= md_set_readonly(mddev
, 0);
3436 else if (mddev
->ro
== 1)
3437 err
= restart_array(mddev
);
3440 set_disk_ro(mddev
->gendisk
, 0);
3444 err
= do_md_run(mddev
);
3449 restart_array(mddev
);
3450 spin_lock_irq(&mddev
->write_lock
);
3451 if (atomic_read(&mddev
->writes_pending
) == 0) {
3452 if (mddev
->in_sync
== 0) {
3454 if (mddev
->safemode
== 1)
3455 mddev
->safemode
= 0;
3456 if (mddev
->persistent
)
3457 set_bit(MD_CHANGE_CLEAN
,
3463 spin_unlock_irq(&mddev
->write_lock
);
3469 restart_array(mddev
);
3470 if (mddev
->external
)
3471 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3472 wake_up(&mddev
->sb_wait
);
3476 set_disk_ro(mddev
->gendisk
, 0);
3477 err
= do_md_run(mddev
);
3482 /* these cannot be set */
3488 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3492 static struct md_sysfs_entry md_array_state
=
3493 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3496 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3497 return sprintf(page
, "%d\n",
3498 atomic_read(&mddev
->max_corr_read_errors
));
3502 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3505 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3507 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3508 atomic_set(&mddev
->max_corr_read_errors
, n
);
3514 static struct md_sysfs_entry max_corr_read_errors
=
3515 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3516 max_corrected_read_errors_store
);
3519 null_show(mddev_t
*mddev
, char *page
)
3525 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3527 /* buf must be %d:%d\n? giving major and minor numbers */
3528 /* The new device is added to the array.
3529 * If the array has a persistent superblock, we read the
3530 * superblock to initialise info and check validity.
3531 * Otherwise, only checking done is that in bind_rdev_to_array,
3532 * which mainly checks size.
3535 int major
= simple_strtoul(buf
, &e
, 10);
3541 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3543 minor
= simple_strtoul(e
+1, &e
, 10);
3544 if (*e
&& *e
!= '\n')
3546 dev
= MKDEV(major
, minor
);
3547 if (major
!= MAJOR(dev
) ||
3548 minor
!= MINOR(dev
))
3552 if (mddev
->persistent
) {
3553 rdev
= md_import_device(dev
, mddev
->major_version
,
3554 mddev
->minor_version
);
3555 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3556 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3557 mdk_rdev_t
, same_set
);
3558 err
= super_types
[mddev
->major_version
]
3559 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3563 } else if (mddev
->external
)
3564 rdev
= md_import_device(dev
, -2, -1);
3566 rdev
= md_import_device(dev
, -1, -1);
3569 return PTR_ERR(rdev
);
3570 err
= bind_rdev_to_array(rdev
, mddev
);
3574 return err
? err
: len
;
3577 static struct md_sysfs_entry md_new_device
=
3578 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3581 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3584 unsigned long chunk
, end_chunk
;
3588 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3590 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3591 if (buf
== end
) break;
3592 if (*end
== '-') { /* range */
3594 end_chunk
= simple_strtoul(buf
, &end
, 0);
3595 if (buf
== end
) break;
3597 if (*end
&& !isspace(*end
)) break;
3598 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3599 buf
= skip_spaces(end
);
3601 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3606 static struct md_sysfs_entry md_bitmap
=
3607 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3610 size_show(mddev_t
*mddev
, char *page
)
3612 return sprintf(page
, "%llu\n",
3613 (unsigned long long)mddev
->dev_sectors
/ 2);
3616 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3619 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3621 /* If array is inactive, we can reduce the component size, but
3622 * not increase it (except from 0).
3623 * If array is active, we can try an on-line resize
3626 int err
= strict_blocks_to_sectors(buf
, §ors
);
3631 err
= update_size(mddev
, sectors
);
3632 md_update_sb(mddev
, 1);
3634 if (mddev
->dev_sectors
== 0 ||
3635 mddev
->dev_sectors
> sectors
)
3636 mddev
->dev_sectors
= sectors
;
3640 return err
? err
: len
;
3643 static struct md_sysfs_entry md_size
=
3644 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3649 * 'none' for arrays with no metadata (good luck...)
3650 * 'external' for arrays with externally managed metadata,
3651 * or N.M for internally known formats
3654 metadata_show(mddev_t
*mddev
, char *page
)
3656 if (mddev
->persistent
)
3657 return sprintf(page
, "%d.%d\n",
3658 mddev
->major_version
, mddev
->minor_version
);
3659 else if (mddev
->external
)
3660 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3662 return sprintf(page
, "none\n");
3666 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3670 /* Changing the details of 'external' metadata is
3671 * always permitted. Otherwise there must be
3672 * no devices attached to the array.
3674 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3676 else if (!list_empty(&mddev
->disks
))
3679 if (cmd_match(buf
, "none")) {
3680 mddev
->persistent
= 0;
3681 mddev
->external
= 0;
3682 mddev
->major_version
= 0;
3683 mddev
->minor_version
= 90;
3686 if (strncmp(buf
, "external:", 9) == 0) {
3687 size_t namelen
= len
-9;
3688 if (namelen
>= sizeof(mddev
->metadata_type
))
3689 namelen
= sizeof(mddev
->metadata_type
)-1;
3690 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3691 mddev
->metadata_type
[namelen
] = 0;
3692 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3693 mddev
->metadata_type
[--namelen
] = 0;
3694 mddev
->persistent
= 0;
3695 mddev
->external
= 1;
3696 mddev
->major_version
= 0;
3697 mddev
->minor_version
= 90;
3700 major
= simple_strtoul(buf
, &e
, 10);
3701 if (e
==buf
|| *e
!= '.')
3704 minor
= simple_strtoul(buf
, &e
, 10);
3705 if (e
==buf
|| (*e
&& *e
!= '\n') )
3707 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3709 mddev
->major_version
= major
;
3710 mddev
->minor_version
= minor
;
3711 mddev
->persistent
= 1;
3712 mddev
->external
= 0;
3716 static struct md_sysfs_entry md_metadata
=
3717 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3720 action_show(mddev_t
*mddev
, char *page
)
3722 char *type
= "idle";
3723 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3725 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3726 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3727 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3729 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3730 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3732 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3736 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3739 return sprintf(page
, "%s\n", type
);
3743 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3745 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3748 if (cmd_match(page
, "frozen"))
3749 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3751 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3753 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3754 if (mddev
->sync_thread
) {
3755 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3756 md_unregister_thread(mddev
->sync_thread
);
3757 mddev
->sync_thread
= NULL
;
3758 mddev
->recovery
= 0;
3760 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3761 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3763 else if (cmd_match(page
, "resync"))
3764 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3765 else if (cmd_match(page
, "recover")) {
3766 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3767 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3768 } else if (cmd_match(page
, "reshape")) {
3770 if (mddev
->pers
->start_reshape
== NULL
)
3772 err
= mddev
->pers
->start_reshape(mddev
);
3775 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3777 if (cmd_match(page
, "check"))
3778 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3779 else if (!cmd_match(page
, "repair"))
3781 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3782 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3784 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3785 md_wakeup_thread(mddev
->thread
);
3786 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3791 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3793 return sprintf(page
, "%llu\n",
3794 (unsigned long long) mddev
->resync_mismatches
);
3797 static struct md_sysfs_entry md_scan_mode
=
3798 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3801 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3804 sync_min_show(mddev_t
*mddev
, char *page
)
3806 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3807 mddev
->sync_speed_min
? "local": "system");
3811 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3815 if (strncmp(buf
, "system", 6)==0) {
3816 mddev
->sync_speed_min
= 0;
3819 min
= simple_strtoul(buf
, &e
, 10);
3820 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3822 mddev
->sync_speed_min
= min
;
3826 static struct md_sysfs_entry md_sync_min
=
3827 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3830 sync_max_show(mddev_t
*mddev
, char *page
)
3832 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3833 mddev
->sync_speed_max
? "local": "system");
3837 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3841 if (strncmp(buf
, "system", 6)==0) {
3842 mddev
->sync_speed_max
= 0;
3845 max
= simple_strtoul(buf
, &e
, 10);
3846 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3848 mddev
->sync_speed_max
= max
;
3852 static struct md_sysfs_entry md_sync_max
=
3853 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3856 degraded_show(mddev_t
*mddev
, char *page
)
3858 return sprintf(page
, "%d\n", mddev
->degraded
);
3860 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3863 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3865 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3869 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3873 if (strict_strtol(buf
, 10, &n
))
3876 if (n
!= 0 && n
!= 1)
3879 mddev
->parallel_resync
= n
;
3881 if (mddev
->sync_thread
)
3882 wake_up(&resync_wait
);
3887 /* force parallel resync, even with shared block devices */
3888 static struct md_sysfs_entry md_sync_force_parallel
=
3889 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3890 sync_force_parallel_show
, sync_force_parallel_store
);
3893 sync_speed_show(mddev_t
*mddev
, char *page
)
3895 unsigned long resync
, dt
, db
;
3896 if (mddev
->curr_resync
== 0)
3897 return sprintf(page
, "none\n");
3898 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3899 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3901 db
= resync
- mddev
->resync_mark_cnt
;
3902 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3905 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3908 sync_completed_show(mddev_t
*mddev
, char *page
)
3910 unsigned long max_sectors
, resync
;
3912 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3913 return sprintf(page
, "none\n");
3915 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3916 max_sectors
= mddev
->resync_max_sectors
;
3918 max_sectors
= mddev
->dev_sectors
;
3920 resync
= mddev
->curr_resync_completed
;
3921 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3924 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3927 min_sync_show(mddev_t
*mddev
, char *page
)
3929 return sprintf(page
, "%llu\n",
3930 (unsigned long long)mddev
->resync_min
);
3933 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3935 unsigned long long min
;
3936 if (strict_strtoull(buf
, 10, &min
))
3938 if (min
> mddev
->resync_max
)
3940 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3943 /* Must be a multiple of chunk_size */
3944 if (mddev
->chunk_sectors
) {
3945 sector_t temp
= min
;
3946 if (sector_div(temp
, mddev
->chunk_sectors
))
3949 mddev
->resync_min
= min
;
3954 static struct md_sysfs_entry md_min_sync
=
3955 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3958 max_sync_show(mddev_t
*mddev
, char *page
)
3960 if (mddev
->resync_max
== MaxSector
)
3961 return sprintf(page
, "max\n");
3963 return sprintf(page
, "%llu\n",
3964 (unsigned long long)mddev
->resync_max
);
3967 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3969 if (strncmp(buf
, "max", 3) == 0)
3970 mddev
->resync_max
= MaxSector
;
3972 unsigned long long max
;
3973 if (strict_strtoull(buf
, 10, &max
))
3975 if (max
< mddev
->resync_min
)
3977 if (max
< mddev
->resync_max
&&
3979 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3982 /* Must be a multiple of chunk_size */
3983 if (mddev
->chunk_sectors
) {
3984 sector_t temp
= max
;
3985 if (sector_div(temp
, mddev
->chunk_sectors
))
3988 mddev
->resync_max
= max
;
3990 wake_up(&mddev
->recovery_wait
);
3994 static struct md_sysfs_entry md_max_sync
=
3995 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3998 suspend_lo_show(mddev_t
*mddev
, char *page
)
4000 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4004 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4007 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4009 if (mddev
->pers
== NULL
||
4010 mddev
->pers
->quiesce
== NULL
)
4012 if (buf
== e
|| (*e
&& *e
!= '\n'))
4014 if (new >= mddev
->suspend_hi
||
4015 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
4016 mddev
->suspend_lo
= new;
4017 mddev
->pers
->quiesce(mddev
, 2);
4022 static struct md_sysfs_entry md_suspend_lo
=
4023 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4027 suspend_hi_show(mddev_t
*mddev
, char *page
)
4029 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4033 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4036 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4038 if (mddev
->pers
== NULL
||
4039 mddev
->pers
->quiesce
== NULL
)
4041 if (buf
== e
|| (*e
&& *e
!= '\n'))
4043 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
4044 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
4045 mddev
->suspend_hi
= new;
4046 mddev
->pers
->quiesce(mddev
, 1);
4047 mddev
->pers
->quiesce(mddev
, 0);
4052 static struct md_sysfs_entry md_suspend_hi
=
4053 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4056 reshape_position_show(mddev_t
*mddev
, char *page
)
4058 if (mddev
->reshape_position
!= MaxSector
)
4059 return sprintf(page
, "%llu\n",
4060 (unsigned long long)mddev
->reshape_position
);
4061 strcpy(page
, "none\n");
4066 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4069 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4072 if (buf
== e
|| (*e
&& *e
!= '\n'))
4074 mddev
->reshape_position
= new;
4075 mddev
->delta_disks
= 0;
4076 mddev
->new_level
= mddev
->level
;
4077 mddev
->new_layout
= mddev
->layout
;
4078 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4082 static struct md_sysfs_entry md_reshape_position
=
4083 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4084 reshape_position_store
);
4087 array_size_show(mddev_t
*mddev
, char *page
)
4089 if (mddev
->external_size
)
4090 return sprintf(page
, "%llu\n",
4091 (unsigned long long)mddev
->array_sectors
/2);
4093 return sprintf(page
, "default\n");
4097 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4101 if (strncmp(buf
, "default", 7) == 0) {
4103 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4105 sectors
= mddev
->array_sectors
;
4107 mddev
->external_size
= 0;
4109 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4111 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4114 mddev
->external_size
= 1;
4117 mddev
->array_sectors
= sectors
;
4118 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4120 revalidate_disk(mddev
->gendisk
);
4125 static struct md_sysfs_entry md_array_size
=
4126 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4129 static struct attribute
*md_default_attrs
[] = {
4132 &md_raid_disks
.attr
,
4133 &md_chunk_size
.attr
,
4135 &md_resync_start
.attr
,
4137 &md_new_device
.attr
,
4138 &md_safe_delay
.attr
,
4139 &md_array_state
.attr
,
4140 &md_reshape_position
.attr
,
4141 &md_array_size
.attr
,
4142 &max_corr_read_errors
.attr
,
4146 static struct attribute
*md_redundancy_attrs
[] = {
4148 &md_mismatches
.attr
,
4151 &md_sync_speed
.attr
,
4152 &md_sync_force_parallel
.attr
,
4153 &md_sync_completed
.attr
,
4156 &md_suspend_lo
.attr
,
4157 &md_suspend_hi
.attr
,
4162 static struct attribute_group md_redundancy_group
= {
4164 .attrs
= md_redundancy_attrs
,
4169 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4171 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4172 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4177 rv
= mddev_lock(mddev
);
4179 rv
= entry
->show(mddev
, page
);
4180 mddev_unlock(mddev
);
4186 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4187 const char *page
, size_t length
)
4189 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4190 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4195 if (!capable(CAP_SYS_ADMIN
))
4197 rv
= mddev_lock(mddev
);
4198 if (mddev
->hold_active
== UNTIL_IOCTL
)
4199 mddev
->hold_active
= 0;
4201 rv
= entry
->store(mddev
, page
, length
);
4202 mddev_unlock(mddev
);
4207 static void md_free(struct kobject
*ko
)
4209 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4211 if (mddev
->sysfs_state
)
4212 sysfs_put(mddev
->sysfs_state
);
4214 if (mddev
->gendisk
) {
4215 del_gendisk(mddev
->gendisk
);
4216 put_disk(mddev
->gendisk
);
4219 blk_cleanup_queue(mddev
->queue
);
4224 static const struct sysfs_ops md_sysfs_ops
= {
4225 .show
= md_attr_show
,
4226 .store
= md_attr_store
,
4228 static struct kobj_type md_ktype
= {
4230 .sysfs_ops
= &md_sysfs_ops
,
4231 .default_attrs
= md_default_attrs
,
4236 static void mddev_delayed_delete(struct work_struct
*ws
)
4238 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4240 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4241 kobject_del(&mddev
->kobj
);
4242 kobject_put(&mddev
->kobj
);
4245 static int md_alloc(dev_t dev
, char *name
)
4247 static DEFINE_MUTEX(disks_mutex
);
4248 mddev_t
*mddev
= mddev_find(dev
);
4249 struct gendisk
*disk
;
4258 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4259 shift
= partitioned
? MdpMinorShift
: 0;
4260 unit
= MINOR(mddev
->unit
) >> shift
;
4262 /* wait for any previous instance if this device
4263 * to be completed removed (mddev_delayed_delete).
4265 flush_scheduled_work();
4267 mutex_lock(&disks_mutex
);
4273 /* Need to ensure that 'name' is not a duplicate.
4276 spin_lock(&all_mddevs_lock
);
4278 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4279 if (mddev2
->gendisk
&&
4280 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4281 spin_unlock(&all_mddevs_lock
);
4284 spin_unlock(&all_mddevs_lock
);
4288 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4291 mddev
->queue
->queuedata
= mddev
;
4293 /* Can be unlocked because the queue is new: no concurrency */
4294 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
4296 blk_queue_make_request(mddev
->queue
, md_make_request
);
4298 disk
= alloc_disk(1 << shift
);
4300 blk_cleanup_queue(mddev
->queue
);
4301 mddev
->queue
= NULL
;
4304 disk
->major
= MAJOR(mddev
->unit
);
4305 disk
->first_minor
= unit
<< shift
;
4307 strcpy(disk
->disk_name
, name
);
4308 else if (partitioned
)
4309 sprintf(disk
->disk_name
, "md_d%d", unit
);
4311 sprintf(disk
->disk_name
, "md%d", unit
);
4312 disk
->fops
= &md_fops
;
4313 disk
->private_data
= mddev
;
4314 disk
->queue
= mddev
->queue
;
4315 /* Allow extended partitions. This makes the
4316 * 'mdp' device redundant, but we can't really
4319 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4321 mddev
->gendisk
= disk
;
4322 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4323 &disk_to_dev(disk
)->kobj
, "%s", "md");
4325 /* This isn't possible, but as kobject_init_and_add is marked
4326 * __must_check, we must do something with the result
4328 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4332 if (mddev
->kobj
.sd
&&
4333 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4334 printk(KERN_DEBUG
"pointless warning\n");
4336 mutex_unlock(&disks_mutex
);
4337 if (!error
&& mddev
->kobj
.sd
) {
4338 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4339 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4345 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4347 md_alloc(dev
, NULL
);
4351 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4353 /* val must be "md_*" where * is not all digits.
4354 * We allocate an array with a large free minor number, and
4355 * set the name to val. val must not already be an active name.
4357 int len
= strlen(val
);
4358 char buf
[DISK_NAME_LEN
];
4360 while (len
&& val
[len
-1] == '\n')
4362 if (len
>= DISK_NAME_LEN
)
4364 strlcpy(buf
, val
, len
+1);
4365 if (strncmp(buf
, "md_", 3) != 0)
4367 return md_alloc(0, buf
);
4370 static void md_safemode_timeout(unsigned long data
)
4372 mddev_t
*mddev
= (mddev_t
*) data
;
4374 if (!atomic_read(&mddev
->writes_pending
)) {
4375 mddev
->safemode
= 1;
4376 if (mddev
->external
)
4377 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4379 md_wakeup_thread(mddev
->thread
);
4382 static int start_dirty_degraded
;
4384 int md_run(mddev_t
*mddev
)
4388 struct mdk_personality
*pers
;
4390 if (list_empty(&mddev
->disks
))
4391 /* cannot run an array with no devices.. */
4396 /* Cannot run until previous stop completes properly */
4397 if (mddev
->sysfs_active
)
4401 * Analyze all RAID superblock(s)
4403 if (!mddev
->raid_disks
) {
4404 if (!mddev
->persistent
)
4409 if (mddev
->level
!= LEVEL_NONE
)
4410 request_module("md-level-%d", mddev
->level
);
4411 else if (mddev
->clevel
[0])
4412 request_module("md-%s", mddev
->clevel
);
4415 * Drop all container device buffers, from now on
4416 * the only valid external interface is through the md
4419 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4420 if (test_bit(Faulty
, &rdev
->flags
))
4422 sync_blockdev(rdev
->bdev
);
4423 invalidate_bdev(rdev
->bdev
);
4425 /* perform some consistency tests on the device.
4426 * We don't want the data to overlap the metadata,
4427 * Internal Bitmap issues have been handled elsewhere.
4429 if (rdev
->data_offset
< rdev
->sb_start
) {
4430 if (mddev
->dev_sectors
&&
4431 rdev
->data_offset
+ mddev
->dev_sectors
4433 printk("md: %s: data overlaps metadata\n",
4438 if (rdev
->sb_start
+ rdev
->sb_size
/512
4439 > rdev
->data_offset
) {
4440 printk("md: %s: metadata overlaps data\n",
4445 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4448 spin_lock(&pers_lock
);
4449 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4450 if (!pers
|| !try_module_get(pers
->owner
)) {
4451 spin_unlock(&pers_lock
);
4452 if (mddev
->level
!= LEVEL_NONE
)
4453 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4456 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4461 spin_unlock(&pers_lock
);
4462 if (mddev
->level
!= pers
->level
) {
4463 mddev
->level
= pers
->level
;
4464 mddev
->new_level
= pers
->level
;
4466 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4468 if (mddev
->reshape_position
!= MaxSector
&&
4469 pers
->start_reshape
== NULL
) {
4470 /* This personality cannot handle reshaping... */
4472 module_put(pers
->owner
);
4476 if (pers
->sync_request
) {
4477 /* Warn if this is a potentially silly
4480 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4484 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4485 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4487 rdev
->bdev
->bd_contains
==
4488 rdev2
->bdev
->bd_contains
) {
4490 "%s: WARNING: %s appears to be"
4491 " on the same physical disk as"
4494 bdevname(rdev
->bdev
,b
),
4495 bdevname(rdev2
->bdev
,b2
));
4502 "True protection against single-disk"
4503 " failure might be compromised.\n");
4506 mddev
->recovery
= 0;
4507 /* may be over-ridden by personality */
4508 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4510 mddev
->barriers_work
= 1;
4511 mddev
->ok_start_degraded
= start_dirty_degraded
;
4513 if (start_readonly
&& mddev
->ro
== 0)
4514 mddev
->ro
= 2; /* read-only, but switch on first write */
4516 err
= mddev
->pers
->run(mddev
);
4518 printk(KERN_ERR
"md: pers->run() failed ...\n");
4519 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4520 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4521 " but 'external_size' not in effect?\n", __func__
);
4523 "md: invalid array_size %llu > default size %llu\n",
4524 (unsigned long long)mddev
->array_sectors
/ 2,
4525 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4527 mddev
->pers
->stop(mddev
);
4529 if (err
== 0 && mddev
->pers
->sync_request
) {
4530 err
= bitmap_create(mddev
);
4532 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4533 mdname(mddev
), err
);
4534 mddev
->pers
->stop(mddev
);
4538 module_put(mddev
->pers
->owner
);
4540 bitmap_destroy(mddev
);
4543 if (mddev
->pers
->sync_request
) {
4544 if (mddev
->kobj
.sd
&&
4545 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4547 "md: cannot register extra attributes for %s\n",
4549 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4550 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4553 atomic_set(&mddev
->writes_pending
,0);
4554 atomic_set(&mddev
->max_corr_read_errors
,
4555 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4556 mddev
->safemode
= 0;
4557 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4558 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4559 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4562 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4563 if (rdev
->raid_disk
>= 0) {
4565 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4566 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4567 /* failure here is OK */;
4570 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4573 md_update_sb(mddev
, 0);
4575 md_wakeup_thread(mddev
->thread
);
4576 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4578 md_new_event(mddev
);
4579 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4580 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4581 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4584 EXPORT_SYMBOL_GPL(md_run
);
4586 static int do_md_run(mddev_t
*mddev
)
4590 err
= md_run(mddev
);
4593 err
= bitmap_load(mddev
);
4595 bitmap_destroy(mddev
);
4598 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4599 revalidate_disk(mddev
->gendisk
);
4600 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4605 static int restart_array(mddev_t
*mddev
)
4607 struct gendisk
*disk
= mddev
->gendisk
;
4609 /* Complain if it has no devices */
4610 if (list_empty(&mddev
->disks
))
4616 mddev
->safemode
= 0;
4618 set_disk_ro(disk
, 0);
4619 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4621 /* Kick recovery or resync if necessary */
4622 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4623 md_wakeup_thread(mddev
->thread
);
4624 md_wakeup_thread(mddev
->sync_thread
);
4625 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4629 /* similar to deny_write_access, but accounts for our holding a reference
4630 * to the file ourselves */
4631 static int deny_bitmap_write_access(struct file
* file
)
4633 struct inode
*inode
= file
->f_mapping
->host
;
4635 spin_lock(&inode
->i_lock
);
4636 if (atomic_read(&inode
->i_writecount
) > 1) {
4637 spin_unlock(&inode
->i_lock
);
4640 atomic_set(&inode
->i_writecount
, -1);
4641 spin_unlock(&inode
->i_lock
);
4646 void restore_bitmap_write_access(struct file
*file
)
4648 struct inode
*inode
= file
->f_mapping
->host
;
4650 spin_lock(&inode
->i_lock
);
4651 atomic_set(&inode
->i_writecount
, 1);
4652 spin_unlock(&inode
->i_lock
);
4655 static void md_clean(mddev_t
*mddev
)
4657 mddev
->array_sectors
= 0;
4658 mddev
->external_size
= 0;
4659 mddev
->dev_sectors
= 0;
4660 mddev
->raid_disks
= 0;
4661 mddev
->recovery_cp
= 0;
4662 mddev
->resync_min
= 0;
4663 mddev
->resync_max
= MaxSector
;
4664 mddev
->reshape_position
= MaxSector
;
4665 mddev
->external
= 0;
4666 mddev
->persistent
= 0;
4667 mddev
->level
= LEVEL_NONE
;
4668 mddev
->clevel
[0] = 0;
4671 mddev
->metadata_type
[0] = 0;
4672 mddev
->chunk_sectors
= 0;
4673 mddev
->ctime
= mddev
->utime
= 0;
4675 mddev
->max_disks
= 0;
4677 mddev
->can_decrease_events
= 0;
4678 mddev
->delta_disks
= 0;
4679 mddev
->new_level
= LEVEL_NONE
;
4680 mddev
->new_layout
= 0;
4681 mddev
->new_chunk_sectors
= 0;
4682 mddev
->curr_resync
= 0;
4683 mddev
->resync_mismatches
= 0;
4684 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4685 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4686 mddev
->recovery
= 0;
4688 mddev
->degraded
= 0;
4689 mddev
->barriers_work
= 0;
4690 mddev
->safemode
= 0;
4691 mddev
->bitmap_info
.offset
= 0;
4692 mddev
->bitmap_info
.default_offset
= 0;
4693 mddev
->bitmap_info
.chunksize
= 0;
4694 mddev
->bitmap_info
.daemon_sleep
= 0;
4695 mddev
->bitmap_info
.max_write_behind
= 0;
4699 void md_stop_writes(mddev_t
*mddev
)
4701 if (mddev
->sync_thread
) {
4702 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4703 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4704 md_unregister_thread(mddev
->sync_thread
);
4705 mddev
->sync_thread
= NULL
;
4708 del_timer_sync(&mddev
->safemode_timer
);
4710 bitmap_flush(mddev
);
4711 md_super_wait(mddev
);
4713 if (!mddev
->in_sync
|| mddev
->flags
) {
4714 /* mark array as shutdown cleanly */
4716 md_update_sb(mddev
, 1);
4719 EXPORT_SYMBOL_GPL(md_stop_writes
);
4721 void md_stop(mddev_t
*mddev
)
4723 mddev
->pers
->stop(mddev
);
4724 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4725 mddev
->to_remove
= &md_redundancy_group
;
4726 module_put(mddev
->pers
->owner
);
4728 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4730 EXPORT_SYMBOL_GPL(md_stop
);
4732 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4735 mutex_lock(&mddev
->open_mutex
);
4736 if (atomic_read(&mddev
->openers
) > is_open
) {
4737 printk("md: %s still in use.\n",mdname(mddev
));
4742 md_stop_writes(mddev
);
4748 set_disk_ro(mddev
->gendisk
, 1);
4749 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4750 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4754 mutex_unlock(&mddev
->open_mutex
);
4759 * 0 - completely stop and dis-assemble array
4760 * 2 - stop but do not disassemble array
4762 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4764 struct gendisk
*disk
= mddev
->gendisk
;
4767 mutex_lock(&mddev
->open_mutex
);
4768 if (atomic_read(&mddev
->openers
) > is_open
||
4769 mddev
->sysfs_active
) {
4770 printk("md: %s still in use.\n",mdname(mddev
));
4771 mutex_unlock(&mddev
->open_mutex
);
4777 set_disk_ro(disk
, 0);
4779 md_stop_writes(mddev
);
4781 mddev
->queue
->merge_bvec_fn
= NULL
;
4782 mddev
->queue
->unplug_fn
= NULL
;
4783 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4785 /* tell userspace to handle 'inactive' */
4786 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4788 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4789 if (rdev
->raid_disk
>= 0) {
4791 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4792 sysfs_remove_link(&mddev
->kobj
, nm
);
4795 set_capacity(disk
, 0);
4796 mutex_unlock(&mddev
->open_mutex
);
4797 revalidate_disk(disk
);
4802 mutex_unlock(&mddev
->open_mutex
);
4804 * Free resources if final stop
4807 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4809 bitmap_destroy(mddev
);
4810 if (mddev
->bitmap_info
.file
) {
4811 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4812 fput(mddev
->bitmap_info
.file
);
4813 mddev
->bitmap_info
.file
= NULL
;
4815 mddev
->bitmap_info
.offset
= 0;
4817 export_array(mddev
);
4820 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4821 if (mddev
->hold_active
== UNTIL_STOP
)
4822 mddev
->hold_active
= 0;
4824 blk_integrity_unregister(disk
);
4825 md_new_event(mddev
);
4826 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4831 static void autorun_array(mddev_t
*mddev
)
4836 if (list_empty(&mddev
->disks
))
4839 printk(KERN_INFO
"md: running: ");
4841 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4842 char b
[BDEVNAME_SIZE
];
4843 printk("<%s>", bdevname(rdev
->bdev
,b
));
4847 err
= do_md_run(mddev
);
4849 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4850 do_md_stop(mddev
, 0, 0);
4855 * lets try to run arrays based on all disks that have arrived
4856 * until now. (those are in pending_raid_disks)
4858 * the method: pick the first pending disk, collect all disks with
4859 * the same UUID, remove all from the pending list and put them into
4860 * the 'same_array' list. Then order this list based on superblock
4861 * update time (freshest comes first), kick out 'old' disks and
4862 * compare superblocks. If everything's fine then run it.
4864 * If "unit" is allocated, then bump its reference count
4866 static void autorun_devices(int part
)
4868 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4870 char b
[BDEVNAME_SIZE
];
4872 printk(KERN_INFO
"md: autorun ...\n");
4873 while (!list_empty(&pending_raid_disks
)) {
4876 LIST_HEAD(candidates
);
4877 rdev0
= list_entry(pending_raid_disks
.next
,
4878 mdk_rdev_t
, same_set
);
4880 printk(KERN_INFO
"md: considering %s ...\n",
4881 bdevname(rdev0
->bdev
,b
));
4882 INIT_LIST_HEAD(&candidates
);
4883 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4884 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4885 printk(KERN_INFO
"md: adding %s ...\n",
4886 bdevname(rdev
->bdev
,b
));
4887 list_move(&rdev
->same_set
, &candidates
);
4890 * now we have a set of devices, with all of them having
4891 * mostly sane superblocks. It's time to allocate the
4895 dev
= MKDEV(mdp_major
,
4896 rdev0
->preferred_minor
<< MdpMinorShift
);
4897 unit
= MINOR(dev
) >> MdpMinorShift
;
4899 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4902 if (rdev0
->preferred_minor
!= unit
) {
4903 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4904 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4908 md_probe(dev
, NULL
, NULL
);
4909 mddev
= mddev_find(dev
);
4910 if (!mddev
|| !mddev
->gendisk
) {
4914 "md: cannot allocate memory for md drive.\n");
4917 if (mddev_lock(mddev
))
4918 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4920 else if (mddev
->raid_disks
|| mddev
->major_version
4921 || !list_empty(&mddev
->disks
)) {
4923 "md: %s already running, cannot run %s\n",
4924 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4925 mddev_unlock(mddev
);
4927 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4928 mddev
->persistent
= 1;
4929 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4930 list_del_init(&rdev
->same_set
);
4931 if (bind_rdev_to_array(rdev
, mddev
))
4934 autorun_array(mddev
);
4935 mddev_unlock(mddev
);
4937 /* on success, candidates will be empty, on error
4940 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4941 list_del_init(&rdev
->same_set
);
4946 printk(KERN_INFO
"md: ... autorun DONE.\n");
4948 #endif /* !MODULE */
4950 static int get_version(void __user
* arg
)
4954 ver
.major
= MD_MAJOR_VERSION
;
4955 ver
.minor
= MD_MINOR_VERSION
;
4956 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4958 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4964 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4966 mdu_array_info_t info
;
4967 int nr
,working
,insync
,failed
,spare
;
4970 nr
=working
=insync
=failed
=spare
=0;
4971 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4973 if (test_bit(Faulty
, &rdev
->flags
))
4977 if (test_bit(In_sync
, &rdev
->flags
))
4984 info
.major_version
= mddev
->major_version
;
4985 info
.minor_version
= mddev
->minor_version
;
4986 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4987 info
.ctime
= mddev
->ctime
;
4988 info
.level
= mddev
->level
;
4989 info
.size
= mddev
->dev_sectors
/ 2;
4990 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4993 info
.raid_disks
= mddev
->raid_disks
;
4994 info
.md_minor
= mddev
->md_minor
;
4995 info
.not_persistent
= !mddev
->persistent
;
4997 info
.utime
= mddev
->utime
;
5000 info
.state
= (1<<MD_SB_CLEAN
);
5001 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5002 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5003 info
.active_disks
= insync
;
5004 info
.working_disks
= working
;
5005 info
.failed_disks
= failed
;
5006 info
.spare_disks
= spare
;
5008 info
.layout
= mddev
->layout
;
5009 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5011 if (copy_to_user(arg
, &info
, sizeof(info
)))
5017 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5019 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5020 char *ptr
, *buf
= NULL
;
5023 if (md_allow_write(mddev
))
5024 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5026 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5031 /* bitmap disabled, zero the first byte and copy out */
5032 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5033 file
->pathname
[0] = '\0';
5037 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5041 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5045 strcpy(file
->pathname
, ptr
);
5049 if (copy_to_user(arg
, file
, sizeof(*file
)))
5057 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5059 mdu_disk_info_t info
;
5062 if (copy_from_user(&info
, arg
, sizeof(info
)))
5065 rdev
= find_rdev_nr(mddev
, info
.number
);
5067 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5068 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5069 info
.raid_disk
= rdev
->raid_disk
;
5071 if (test_bit(Faulty
, &rdev
->flags
))
5072 info
.state
|= (1<<MD_DISK_FAULTY
);
5073 else if (test_bit(In_sync
, &rdev
->flags
)) {
5074 info
.state
|= (1<<MD_DISK_ACTIVE
);
5075 info
.state
|= (1<<MD_DISK_SYNC
);
5077 if (test_bit(WriteMostly
, &rdev
->flags
))
5078 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5080 info
.major
= info
.minor
= 0;
5081 info
.raid_disk
= -1;
5082 info
.state
= (1<<MD_DISK_REMOVED
);
5085 if (copy_to_user(arg
, &info
, sizeof(info
)))
5091 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5093 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5095 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5097 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5100 if (!mddev
->raid_disks
) {
5102 /* expecting a device which has a superblock */
5103 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5106 "md: md_import_device returned %ld\n",
5108 return PTR_ERR(rdev
);
5110 if (!list_empty(&mddev
->disks
)) {
5111 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5112 mdk_rdev_t
, same_set
);
5113 err
= super_types
[mddev
->major_version
]
5114 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5117 "md: %s has different UUID to %s\n",
5118 bdevname(rdev
->bdev
,b
),
5119 bdevname(rdev0
->bdev
,b2
));
5124 err
= bind_rdev_to_array(rdev
, mddev
);
5131 * add_new_disk can be used once the array is assembled
5132 * to add "hot spares". They must already have a superblock
5137 if (!mddev
->pers
->hot_add_disk
) {
5139 "%s: personality does not support diskops!\n",
5143 if (mddev
->persistent
)
5144 rdev
= md_import_device(dev
, mddev
->major_version
,
5145 mddev
->minor_version
);
5147 rdev
= md_import_device(dev
, -1, -1);
5150 "md: md_import_device returned %ld\n",
5152 return PTR_ERR(rdev
);
5154 /* set save_raid_disk if appropriate */
5155 if (!mddev
->persistent
) {
5156 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5157 info
->raid_disk
< mddev
->raid_disks
)
5158 rdev
->raid_disk
= info
->raid_disk
;
5160 rdev
->raid_disk
= -1;
5162 super_types
[mddev
->major_version
].
5163 validate_super(mddev
, rdev
);
5164 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5166 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5167 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5168 set_bit(WriteMostly
, &rdev
->flags
);
5170 clear_bit(WriteMostly
, &rdev
->flags
);
5172 rdev
->raid_disk
= -1;
5173 err
= bind_rdev_to_array(rdev
, mddev
);
5174 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5175 /* If there is hot_add_disk but no hot_remove_disk
5176 * then added disks for geometry changes,
5177 * and should be added immediately.
5179 super_types
[mddev
->major_version
].
5180 validate_super(mddev
, rdev
);
5181 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5183 unbind_rdev_from_array(rdev
);
5188 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5190 md_update_sb(mddev
, 1);
5191 if (mddev
->degraded
)
5192 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5193 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5194 md_wakeup_thread(mddev
->thread
);
5198 /* otherwise, add_new_disk is only allowed
5199 * for major_version==0 superblocks
5201 if (mddev
->major_version
!= 0) {
5202 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5207 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5209 rdev
= md_import_device(dev
, -1, 0);
5212 "md: error, md_import_device() returned %ld\n",
5214 return PTR_ERR(rdev
);
5216 rdev
->desc_nr
= info
->number
;
5217 if (info
->raid_disk
< mddev
->raid_disks
)
5218 rdev
->raid_disk
= info
->raid_disk
;
5220 rdev
->raid_disk
= -1;
5222 if (rdev
->raid_disk
< mddev
->raid_disks
)
5223 if (info
->state
& (1<<MD_DISK_SYNC
))
5224 set_bit(In_sync
, &rdev
->flags
);
5226 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5227 set_bit(WriteMostly
, &rdev
->flags
);
5229 if (!mddev
->persistent
) {
5230 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5231 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5233 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5234 rdev
->sectors
= rdev
->sb_start
;
5236 err
= bind_rdev_to_array(rdev
, mddev
);
5246 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5248 char b
[BDEVNAME_SIZE
];
5251 rdev
= find_rdev(mddev
, dev
);
5255 if (rdev
->raid_disk
>= 0)
5258 kick_rdev_from_array(rdev
);
5259 md_update_sb(mddev
, 1);
5260 md_new_event(mddev
);
5264 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5265 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5269 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5271 char b
[BDEVNAME_SIZE
];
5278 if (mddev
->major_version
!= 0) {
5279 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5280 " version-0 superblocks.\n",
5284 if (!mddev
->pers
->hot_add_disk
) {
5286 "%s: personality does not support diskops!\n",
5291 rdev
= md_import_device(dev
, -1, 0);
5294 "md: error, md_import_device() returned %ld\n",
5299 if (mddev
->persistent
)
5300 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5302 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5304 rdev
->sectors
= rdev
->sb_start
;
5306 if (test_bit(Faulty
, &rdev
->flags
)) {
5308 "md: can not hot-add faulty %s disk to %s!\n",
5309 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5313 clear_bit(In_sync
, &rdev
->flags
);
5315 rdev
->saved_raid_disk
= -1;
5316 err
= bind_rdev_to_array(rdev
, mddev
);
5321 * The rest should better be atomic, we can have disk failures
5322 * noticed in interrupt contexts ...
5325 rdev
->raid_disk
= -1;
5327 md_update_sb(mddev
, 1);
5330 * Kick recovery, maybe this spare has to be added to the
5331 * array immediately.
5333 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5334 md_wakeup_thread(mddev
->thread
);
5335 md_new_event(mddev
);
5343 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5348 if (!mddev
->pers
->quiesce
)
5350 if (mddev
->recovery
|| mddev
->sync_thread
)
5352 /* we should be able to change the bitmap.. */
5358 return -EEXIST
; /* cannot add when bitmap is present */
5359 mddev
->bitmap_info
.file
= fget(fd
);
5361 if (mddev
->bitmap_info
.file
== NULL
) {
5362 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5367 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5369 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5371 fput(mddev
->bitmap_info
.file
);
5372 mddev
->bitmap_info
.file
= NULL
;
5375 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5376 } else if (mddev
->bitmap
== NULL
)
5377 return -ENOENT
; /* cannot remove what isn't there */
5380 mddev
->pers
->quiesce(mddev
, 1);
5382 err
= bitmap_create(mddev
);
5384 err
= bitmap_load(mddev
);
5386 if (fd
< 0 || err
) {
5387 bitmap_destroy(mddev
);
5388 fd
= -1; /* make sure to put the file */
5390 mddev
->pers
->quiesce(mddev
, 0);
5393 if (mddev
->bitmap_info
.file
) {
5394 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5395 fput(mddev
->bitmap_info
.file
);
5397 mddev
->bitmap_info
.file
= NULL
;
5404 * set_array_info is used two different ways
5405 * The original usage is when creating a new array.
5406 * In this usage, raid_disks is > 0 and it together with
5407 * level, size, not_persistent,layout,chunksize determine the
5408 * shape of the array.
5409 * This will always create an array with a type-0.90.0 superblock.
5410 * The newer usage is when assembling an array.
5411 * In this case raid_disks will be 0, and the major_version field is
5412 * use to determine which style super-blocks are to be found on the devices.
5413 * The minor and patch _version numbers are also kept incase the
5414 * super_block handler wishes to interpret them.
5416 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5419 if (info
->raid_disks
== 0) {
5420 /* just setting version number for superblock loading */
5421 if (info
->major_version
< 0 ||
5422 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5423 super_types
[info
->major_version
].name
== NULL
) {
5424 /* maybe try to auto-load a module? */
5426 "md: superblock version %d not known\n",
5427 info
->major_version
);
5430 mddev
->major_version
= info
->major_version
;
5431 mddev
->minor_version
= info
->minor_version
;
5432 mddev
->patch_version
= info
->patch_version
;
5433 mddev
->persistent
= !info
->not_persistent
;
5434 /* ensure mddev_put doesn't delete this now that there
5435 * is some minimal configuration.
5437 mddev
->ctime
= get_seconds();
5440 mddev
->major_version
= MD_MAJOR_VERSION
;
5441 mddev
->minor_version
= MD_MINOR_VERSION
;
5442 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5443 mddev
->ctime
= get_seconds();
5445 mddev
->level
= info
->level
;
5446 mddev
->clevel
[0] = 0;
5447 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5448 mddev
->raid_disks
= info
->raid_disks
;
5449 /* don't set md_minor, it is determined by which /dev/md* was
5452 if (info
->state
& (1<<MD_SB_CLEAN
))
5453 mddev
->recovery_cp
= MaxSector
;
5455 mddev
->recovery_cp
= 0;
5456 mddev
->persistent
= ! info
->not_persistent
;
5457 mddev
->external
= 0;
5459 mddev
->layout
= info
->layout
;
5460 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5462 mddev
->max_disks
= MD_SB_DISKS
;
5464 if (mddev
->persistent
)
5466 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5468 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5469 mddev
->bitmap_info
.offset
= 0;
5471 mddev
->reshape_position
= MaxSector
;
5474 * Generate a 128 bit UUID
5476 get_random_bytes(mddev
->uuid
, 16);
5478 mddev
->new_level
= mddev
->level
;
5479 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5480 mddev
->new_layout
= mddev
->layout
;
5481 mddev
->delta_disks
= 0;
5486 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5488 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5490 if (mddev
->external_size
)
5493 mddev
->array_sectors
= array_sectors
;
5495 EXPORT_SYMBOL(md_set_array_sectors
);
5497 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5501 int fit
= (num_sectors
== 0);
5503 if (mddev
->pers
->resize
== NULL
)
5505 /* The "num_sectors" is the number of sectors of each device that
5506 * is used. This can only make sense for arrays with redundancy.
5507 * linear and raid0 always use whatever space is available. We can only
5508 * consider changing this number if no resync or reconstruction is
5509 * happening, and if the new size is acceptable. It must fit before the
5510 * sb_start or, if that is <data_offset, it must fit before the size
5511 * of each device. If num_sectors is zero, we find the largest size
5515 if (mddev
->sync_thread
)
5518 /* Sorry, cannot grow a bitmap yet, just remove it,
5522 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5523 sector_t avail
= rdev
->sectors
;
5525 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5526 num_sectors
= avail
;
5527 if (avail
< num_sectors
)
5530 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5532 revalidate_disk(mddev
->gendisk
);
5536 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5539 /* change the number of raid disks */
5540 if (mddev
->pers
->check_reshape
== NULL
)
5542 if (raid_disks
<= 0 ||
5543 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5545 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5547 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5549 rv
= mddev
->pers
->check_reshape(mddev
);
5555 * update_array_info is used to change the configuration of an
5557 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5558 * fields in the info are checked against the array.
5559 * Any differences that cannot be handled will cause an error.
5560 * Normally, only one change can be managed at a time.
5562 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5568 /* calculate expected state,ignoring low bits */
5569 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5570 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5572 if (mddev
->major_version
!= info
->major_version
||
5573 mddev
->minor_version
!= info
->minor_version
||
5574 /* mddev->patch_version != info->patch_version || */
5575 mddev
->ctime
!= info
->ctime
||
5576 mddev
->level
!= info
->level
||
5577 /* mddev->layout != info->layout || */
5578 !mddev
->persistent
!= info
->not_persistent
||
5579 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5580 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5581 ((state
^info
->state
) & 0xfffffe00)
5584 /* Check there is only one change */
5585 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5587 if (mddev
->raid_disks
!= info
->raid_disks
)
5589 if (mddev
->layout
!= info
->layout
)
5591 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5598 if (mddev
->layout
!= info
->layout
) {
5600 * we don't need to do anything at the md level, the
5601 * personality will take care of it all.
5603 if (mddev
->pers
->check_reshape
== NULL
)
5606 mddev
->new_layout
= info
->layout
;
5607 rv
= mddev
->pers
->check_reshape(mddev
);
5609 mddev
->new_layout
= mddev
->layout
;
5613 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5614 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5616 if (mddev
->raid_disks
!= info
->raid_disks
)
5617 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5619 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5620 if (mddev
->pers
->quiesce
== NULL
)
5622 if (mddev
->recovery
|| mddev
->sync_thread
)
5624 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5625 /* add the bitmap */
5628 if (mddev
->bitmap_info
.default_offset
== 0)
5630 mddev
->bitmap_info
.offset
=
5631 mddev
->bitmap_info
.default_offset
;
5632 mddev
->pers
->quiesce(mddev
, 1);
5633 rv
= bitmap_create(mddev
);
5635 rv
= bitmap_load(mddev
);
5637 bitmap_destroy(mddev
);
5638 mddev
->pers
->quiesce(mddev
, 0);
5640 /* remove the bitmap */
5643 if (mddev
->bitmap
->file
)
5645 mddev
->pers
->quiesce(mddev
, 1);
5646 bitmap_destroy(mddev
);
5647 mddev
->pers
->quiesce(mddev
, 0);
5648 mddev
->bitmap_info
.offset
= 0;
5651 md_update_sb(mddev
, 1);
5655 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5659 if (mddev
->pers
== NULL
)
5662 rdev
= find_rdev(mddev
, dev
);
5666 md_error(mddev
, rdev
);
5671 * We have a problem here : there is no easy way to give a CHS
5672 * virtual geometry. We currently pretend that we have a 2 heads
5673 * 4 sectors (with a BIG number of cylinders...). This drives
5674 * dosfs just mad... ;-)
5676 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5678 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5682 geo
->cylinders
= mddev
->array_sectors
/ 8;
5686 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5687 unsigned int cmd
, unsigned long arg
)
5690 void __user
*argp
= (void __user
*)arg
;
5691 mddev_t
*mddev
= NULL
;
5694 if (!capable(CAP_SYS_ADMIN
))
5698 * Commands dealing with the RAID driver but not any
5704 err
= get_version(argp
);
5707 case PRINT_RAID_DEBUG
:
5715 autostart_arrays(arg
);
5722 * Commands creating/starting a new array:
5725 mddev
= bdev
->bd_disk
->private_data
;
5732 err
= mddev_lock(mddev
);
5735 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5742 case SET_ARRAY_INFO
:
5744 mdu_array_info_t info
;
5746 memset(&info
, 0, sizeof(info
));
5747 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5752 err
= update_array_info(mddev
, &info
);
5754 printk(KERN_WARNING
"md: couldn't update"
5755 " array info. %d\n", err
);
5760 if (!list_empty(&mddev
->disks
)) {
5762 "md: array %s already has disks!\n",
5767 if (mddev
->raid_disks
) {
5769 "md: array %s already initialised!\n",
5774 err
= set_array_info(mddev
, &info
);
5776 printk(KERN_WARNING
"md: couldn't set"
5777 " array info. %d\n", err
);
5787 * Commands querying/configuring an existing array:
5789 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5790 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5791 if ((!mddev
->raid_disks
&& !mddev
->external
)
5792 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5793 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5794 && cmd
!= GET_BITMAP_FILE
) {
5800 * Commands even a read-only array can execute:
5804 case GET_ARRAY_INFO
:
5805 err
= get_array_info(mddev
, argp
);
5808 case GET_BITMAP_FILE
:
5809 err
= get_bitmap_file(mddev
, argp
);
5813 err
= get_disk_info(mddev
, argp
);
5816 case RESTART_ARRAY_RW
:
5817 err
= restart_array(mddev
);
5821 err
= do_md_stop(mddev
, 0, 1);
5825 err
= md_set_readonly(mddev
, 1);
5829 if (get_user(ro
, (int __user
*)(arg
))) {
5835 /* if the bdev is going readonly the value of mddev->ro
5836 * does not matter, no writes are coming
5841 /* are we are already prepared for writes? */
5845 /* transitioning to readauto need only happen for
5846 * arrays that call md_write_start
5849 err
= restart_array(mddev
);
5852 set_disk_ro(mddev
->gendisk
, 0);
5859 * The remaining ioctls are changing the state of the
5860 * superblock, so we do not allow them on read-only arrays.
5861 * However non-MD ioctls (e.g. get-size) will still come through
5862 * here and hit the 'default' below, so only disallow
5863 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5865 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5866 if (mddev
->ro
== 2) {
5868 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5869 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5870 md_wakeup_thread(mddev
->thread
);
5881 mdu_disk_info_t info
;
5882 if (copy_from_user(&info
, argp
, sizeof(info
)))
5885 err
= add_new_disk(mddev
, &info
);
5889 case HOT_REMOVE_DISK
:
5890 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5894 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5897 case SET_DISK_FAULTY
:
5898 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5902 err
= do_md_run(mddev
);
5905 case SET_BITMAP_FILE
:
5906 err
= set_bitmap_file(mddev
, (int)arg
);
5916 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5918 mddev
->hold_active
= 0;
5919 mddev_unlock(mddev
);
5928 #ifdef CONFIG_COMPAT
5929 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5930 unsigned int cmd
, unsigned long arg
)
5933 case HOT_REMOVE_DISK
:
5935 case SET_DISK_FAULTY
:
5936 case SET_BITMAP_FILE
:
5937 /* These take in integer arg, do not convert */
5940 arg
= (unsigned long)compat_ptr(arg
);
5944 return md_ioctl(bdev
, mode
, cmd
, arg
);
5946 #endif /* CONFIG_COMPAT */
5948 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5951 * Succeed if we can lock the mddev, which confirms that
5952 * it isn't being stopped right now.
5954 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5958 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5959 /* we are racing with mddev_put which is discarding this
5963 /* Wait until bdev->bd_disk is definitely gone */
5964 flush_scheduled_work();
5965 /* Then retry the open from the top */
5967 return -ERESTARTSYS
;
5969 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5971 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5975 atomic_inc(&mddev
->openers
);
5976 mutex_unlock(&mddev
->open_mutex
);
5978 check_disk_size_change(mddev
->gendisk
, bdev
);
5984 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5986 mddev_t
*mddev
= disk
->private_data
;
5990 atomic_dec(&mddev
->openers
);
5996 static const struct block_device_operations md_fops
=
5998 .owner
= THIS_MODULE
,
6000 .release
= md_release
,
6002 #ifdef CONFIG_COMPAT
6003 .compat_ioctl
= md_compat_ioctl
,
6005 .getgeo
= md_getgeo
,
6008 static int md_thread(void * arg
)
6010 mdk_thread_t
*thread
= arg
;
6013 * md_thread is a 'system-thread', it's priority should be very
6014 * high. We avoid resource deadlocks individually in each
6015 * raid personality. (RAID5 does preallocation) We also use RR and
6016 * the very same RT priority as kswapd, thus we will never get
6017 * into a priority inversion deadlock.
6019 * we definitely have to have equal or higher priority than
6020 * bdflush, otherwise bdflush will deadlock if there are too
6021 * many dirty RAID5 blocks.
6024 allow_signal(SIGKILL
);
6025 while (!kthread_should_stop()) {
6027 /* We need to wait INTERRUPTIBLE so that
6028 * we don't add to the load-average.
6029 * That means we need to be sure no signals are
6032 if (signal_pending(current
))
6033 flush_signals(current
);
6035 wait_event_interruptible_timeout
6037 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6038 || kthread_should_stop(),
6041 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6043 thread
->run(thread
->mddev
);
6049 void md_wakeup_thread(mdk_thread_t
*thread
)
6052 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6053 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6054 wake_up(&thread
->wqueue
);
6058 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6061 mdk_thread_t
*thread
;
6063 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6067 init_waitqueue_head(&thread
->wqueue
);
6070 thread
->mddev
= mddev
;
6071 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6072 thread
->tsk
= kthread_run(md_thread
, thread
,
6074 mdname(thread
->mddev
),
6075 name
?: mddev
->pers
->name
);
6076 if (IS_ERR(thread
->tsk
)) {
6083 void md_unregister_thread(mdk_thread_t
*thread
)
6087 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6089 kthread_stop(thread
->tsk
);
6093 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6100 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6103 if (mddev
->external
)
6104 set_bit(Blocked
, &rdev
->flags
);
6106 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6108 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6109 __builtin_return_address(0),__builtin_return_address(1),
6110 __builtin_return_address(2),__builtin_return_address(3));
6114 if (!mddev
->pers
->error_handler
)
6116 mddev
->pers
->error_handler(mddev
,rdev
);
6117 if (mddev
->degraded
)
6118 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6119 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6120 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6121 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6122 md_wakeup_thread(mddev
->thread
);
6123 if (mddev
->event_work
.func
)
6124 schedule_work(&mddev
->event_work
);
6125 md_new_event_inintr(mddev
);
6128 /* seq_file implementation /proc/mdstat */
6130 static void status_unused(struct seq_file
*seq
)
6135 seq_printf(seq
, "unused devices: ");
6137 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6138 char b
[BDEVNAME_SIZE
];
6140 seq_printf(seq
, "%s ",
6141 bdevname(rdev
->bdev
,b
));
6144 seq_printf(seq
, "<none>");
6146 seq_printf(seq
, "\n");
6150 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6152 sector_t max_sectors
, resync
, res
;
6153 unsigned long dt
, db
;
6156 unsigned int per_milli
;
6158 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6160 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6161 max_sectors
= mddev
->resync_max_sectors
;
6163 max_sectors
= mddev
->dev_sectors
;
6166 * Should not happen.
6172 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6173 * in a sector_t, and (max_sectors>>scale) will fit in a
6174 * u32, as those are the requirements for sector_div.
6175 * Thus 'scale' must be at least 10
6178 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6179 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6182 res
= (resync
>>scale
)*1000;
6183 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6187 int i
, x
= per_milli
/50, y
= 20-x
;
6188 seq_printf(seq
, "[");
6189 for (i
= 0; i
< x
; i
++)
6190 seq_printf(seq
, "=");
6191 seq_printf(seq
, ">");
6192 for (i
= 0; i
< y
; i
++)
6193 seq_printf(seq
, ".");
6194 seq_printf(seq
, "] ");
6196 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6197 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6199 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6201 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6202 "resync" : "recovery"))),
6203 per_milli
/10, per_milli
% 10,
6204 (unsigned long long) resync
/2,
6205 (unsigned long long) max_sectors
/2);
6208 * dt: time from mark until now
6209 * db: blocks written from mark until now
6210 * rt: remaining time
6212 * rt is a sector_t, so could be 32bit or 64bit.
6213 * So we divide before multiply in case it is 32bit and close
6215 * We scale the divisor (db) by 32 to avoid loosing precision
6216 * near the end of resync when the number of remaining sectors
6218 * We then divide rt by 32 after multiplying by db to compensate.
6219 * The '+1' avoids division by zero if db is very small.
6221 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6223 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6224 - mddev
->resync_mark_cnt
;
6226 rt
= max_sectors
- resync
; /* number of remaining sectors */
6227 sector_div(rt
, db
/32+1);
6231 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6232 ((unsigned long)rt
% 60)/6);
6234 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6237 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6239 struct list_head
*tmp
;
6249 spin_lock(&all_mddevs_lock
);
6250 list_for_each(tmp
,&all_mddevs
)
6252 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6254 spin_unlock(&all_mddevs_lock
);
6257 spin_unlock(&all_mddevs_lock
);
6259 return (void*)2;/* tail */
6263 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6265 struct list_head
*tmp
;
6266 mddev_t
*next_mddev
, *mddev
= v
;
6272 spin_lock(&all_mddevs_lock
);
6274 tmp
= all_mddevs
.next
;
6276 tmp
= mddev
->all_mddevs
.next
;
6277 if (tmp
!= &all_mddevs
)
6278 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6280 next_mddev
= (void*)2;
6283 spin_unlock(&all_mddevs_lock
);
6291 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6295 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6299 struct mdstat_info
{
6303 static int md_seq_show(struct seq_file
*seq
, void *v
)
6308 struct mdstat_info
*mi
= seq
->private;
6309 struct bitmap
*bitmap
;
6311 if (v
== (void*)1) {
6312 struct mdk_personality
*pers
;
6313 seq_printf(seq
, "Personalities : ");
6314 spin_lock(&pers_lock
);
6315 list_for_each_entry(pers
, &pers_list
, list
)
6316 seq_printf(seq
, "[%s] ", pers
->name
);
6318 spin_unlock(&pers_lock
);
6319 seq_printf(seq
, "\n");
6320 mi
->event
= atomic_read(&md_event_count
);
6323 if (v
== (void*)2) {
6328 if (mddev_lock(mddev
) < 0)
6331 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6332 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6333 mddev
->pers
? "" : "in");
6336 seq_printf(seq
, " (read-only)");
6338 seq_printf(seq
, " (auto-read-only)");
6339 seq_printf(seq
, " %s", mddev
->pers
->name
);
6343 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6344 char b
[BDEVNAME_SIZE
];
6345 seq_printf(seq
, " %s[%d]",
6346 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6347 if (test_bit(WriteMostly
, &rdev
->flags
))
6348 seq_printf(seq
, "(W)");
6349 if (test_bit(Faulty
, &rdev
->flags
)) {
6350 seq_printf(seq
, "(F)");
6352 } else if (rdev
->raid_disk
< 0)
6353 seq_printf(seq
, "(S)"); /* spare */
6354 sectors
+= rdev
->sectors
;
6357 if (!list_empty(&mddev
->disks
)) {
6359 seq_printf(seq
, "\n %llu blocks",
6360 (unsigned long long)
6361 mddev
->array_sectors
/ 2);
6363 seq_printf(seq
, "\n %llu blocks",
6364 (unsigned long long)sectors
/ 2);
6366 if (mddev
->persistent
) {
6367 if (mddev
->major_version
!= 0 ||
6368 mddev
->minor_version
!= 90) {
6369 seq_printf(seq
," super %d.%d",
6370 mddev
->major_version
,
6371 mddev
->minor_version
);
6373 } else if (mddev
->external
)
6374 seq_printf(seq
, " super external:%s",
6375 mddev
->metadata_type
);
6377 seq_printf(seq
, " super non-persistent");
6380 mddev
->pers
->status(seq
, mddev
);
6381 seq_printf(seq
, "\n ");
6382 if (mddev
->pers
->sync_request
) {
6383 if (mddev
->curr_resync
> 2) {
6384 status_resync(seq
, mddev
);
6385 seq_printf(seq
, "\n ");
6386 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6387 seq_printf(seq
, "\tresync=DELAYED\n ");
6388 else if (mddev
->recovery_cp
< MaxSector
)
6389 seq_printf(seq
, "\tresync=PENDING\n ");
6392 seq_printf(seq
, "\n ");
6394 if ((bitmap
= mddev
->bitmap
)) {
6395 unsigned long chunk_kb
;
6396 unsigned long flags
;
6397 spin_lock_irqsave(&bitmap
->lock
, flags
);
6398 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6399 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6401 bitmap
->pages
- bitmap
->missing_pages
,
6403 (bitmap
->pages
- bitmap
->missing_pages
)
6404 << (PAGE_SHIFT
- 10),
6405 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6406 chunk_kb
? "KB" : "B");
6408 seq_printf(seq
, ", file: ");
6409 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6412 seq_printf(seq
, "\n");
6413 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6416 seq_printf(seq
, "\n");
6418 mddev_unlock(mddev
);
6423 static const struct seq_operations md_seq_ops
= {
6424 .start
= md_seq_start
,
6425 .next
= md_seq_next
,
6426 .stop
= md_seq_stop
,
6427 .show
= md_seq_show
,
6430 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6433 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6437 error
= seq_open(file
, &md_seq_ops
);
6441 struct seq_file
*p
= file
->private_data
;
6443 mi
->event
= atomic_read(&md_event_count
);
6448 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6450 struct seq_file
*m
= filp
->private_data
;
6451 struct mdstat_info
*mi
= m
->private;
6454 poll_wait(filp
, &md_event_waiters
, wait
);
6456 /* always allow read */
6457 mask
= POLLIN
| POLLRDNORM
;
6459 if (mi
->event
!= atomic_read(&md_event_count
))
6460 mask
|= POLLERR
| POLLPRI
;
6464 static const struct file_operations md_seq_fops
= {
6465 .owner
= THIS_MODULE
,
6466 .open
= md_seq_open
,
6468 .llseek
= seq_lseek
,
6469 .release
= seq_release_private
,
6470 .poll
= mdstat_poll
,
6473 int register_md_personality(struct mdk_personality
*p
)
6475 spin_lock(&pers_lock
);
6476 list_add_tail(&p
->list
, &pers_list
);
6477 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6478 spin_unlock(&pers_lock
);
6482 int unregister_md_personality(struct mdk_personality
*p
)
6484 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6485 spin_lock(&pers_lock
);
6486 list_del_init(&p
->list
);
6487 spin_unlock(&pers_lock
);
6491 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6499 rdev_for_each_rcu(rdev
, mddev
) {
6500 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6501 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6502 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6503 atomic_read(&disk
->sync_io
);
6504 /* sync IO will cause sync_io to increase before the disk_stats
6505 * as sync_io is counted when a request starts, and
6506 * disk_stats is counted when it completes.
6507 * So resync activity will cause curr_events to be smaller than
6508 * when there was no such activity.
6509 * non-sync IO will cause disk_stat to increase without
6510 * increasing sync_io so curr_events will (eventually)
6511 * be larger than it was before. Once it becomes
6512 * substantially larger, the test below will cause
6513 * the array to appear non-idle, and resync will slow
6515 * If there is a lot of outstanding resync activity when
6516 * we set last_event to curr_events, then all that activity
6517 * completing might cause the array to appear non-idle
6518 * and resync will be slowed down even though there might
6519 * not have been non-resync activity. This will only
6520 * happen once though. 'last_events' will soon reflect
6521 * the state where there is little or no outstanding
6522 * resync requests, and further resync activity will
6523 * always make curr_events less than last_events.
6526 if (init
|| curr_events
- rdev
->last_events
> 64) {
6527 rdev
->last_events
= curr_events
;
6535 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6537 /* another "blocks" (512byte) blocks have been synced */
6538 atomic_sub(blocks
, &mddev
->recovery_active
);
6539 wake_up(&mddev
->recovery_wait
);
6541 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6542 md_wakeup_thread(mddev
->thread
);
6543 // stop recovery, signal do_sync ....
6548 /* md_write_start(mddev, bi)
6549 * If we need to update some array metadata (e.g. 'active' flag
6550 * in superblock) before writing, schedule a superblock update
6551 * and wait for it to complete.
6553 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6556 if (bio_data_dir(bi
) != WRITE
)
6559 BUG_ON(mddev
->ro
== 1);
6560 if (mddev
->ro
== 2) {
6561 /* need to switch to read/write */
6563 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6564 md_wakeup_thread(mddev
->thread
);
6565 md_wakeup_thread(mddev
->sync_thread
);
6568 atomic_inc(&mddev
->writes_pending
);
6569 if (mddev
->safemode
== 1)
6570 mddev
->safemode
= 0;
6571 if (mddev
->in_sync
) {
6572 spin_lock_irq(&mddev
->write_lock
);
6573 if (mddev
->in_sync
) {
6575 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6576 md_wakeup_thread(mddev
->thread
);
6579 spin_unlock_irq(&mddev
->write_lock
);
6582 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6583 wait_event(mddev
->sb_wait
,
6584 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
6585 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6588 void md_write_end(mddev_t
*mddev
)
6590 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6591 if (mddev
->safemode
== 2)
6592 md_wakeup_thread(mddev
->thread
);
6593 else if (mddev
->safemode_delay
)
6594 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6598 /* md_allow_write(mddev)
6599 * Calling this ensures that the array is marked 'active' so that writes
6600 * may proceed without blocking. It is important to call this before
6601 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6602 * Must be called with mddev_lock held.
6604 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6605 * is dropped, so return -EAGAIN after notifying userspace.
6607 int md_allow_write(mddev_t
*mddev
)
6613 if (!mddev
->pers
->sync_request
)
6616 spin_lock_irq(&mddev
->write_lock
);
6617 if (mddev
->in_sync
) {
6619 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6620 if (mddev
->safemode_delay
&&
6621 mddev
->safemode
== 0)
6622 mddev
->safemode
= 1;
6623 spin_unlock_irq(&mddev
->write_lock
);
6624 md_update_sb(mddev
, 0);
6625 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6627 spin_unlock_irq(&mddev
->write_lock
);
6629 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
6634 EXPORT_SYMBOL_GPL(md_allow_write
);
6636 void md_unplug(mddev_t
*mddev
)
6639 blk_unplug(mddev
->queue
);
6641 mddev
->plug
->unplug_fn(mddev
->plug
);
6644 #define SYNC_MARKS 10
6645 #define SYNC_MARK_STEP (3*HZ)
6646 void md_do_sync(mddev_t
*mddev
)
6649 unsigned int currspeed
= 0,
6651 sector_t max_sectors
,j
, io_sectors
;
6652 unsigned long mark
[SYNC_MARKS
];
6653 sector_t mark_cnt
[SYNC_MARKS
];
6655 struct list_head
*tmp
;
6656 sector_t last_check
;
6661 /* just incase thread restarts... */
6662 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6664 if (mddev
->ro
) /* never try to sync a read-only array */
6667 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6668 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6669 desc
= "data-check";
6670 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6671 desc
= "requested-resync";
6674 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6679 /* we overload curr_resync somewhat here.
6680 * 0 == not engaged in resync at all
6681 * 2 == checking that there is no conflict with another sync
6682 * 1 == like 2, but have yielded to allow conflicting resync to
6684 * other == active in resync - this many blocks
6686 * Before starting a resync we must have set curr_resync to
6687 * 2, and then checked that every "conflicting" array has curr_resync
6688 * less than ours. When we find one that is the same or higher
6689 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6690 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6691 * This will mean we have to start checking from the beginning again.
6696 mddev
->curr_resync
= 2;
6699 if (kthread_should_stop())
6700 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6702 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6704 for_each_mddev(mddev2
, tmp
) {
6705 if (mddev2
== mddev
)
6707 if (!mddev
->parallel_resync
6708 && mddev2
->curr_resync
6709 && match_mddev_units(mddev
, mddev2
)) {
6711 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6712 /* arbitrarily yield */
6713 mddev
->curr_resync
= 1;
6714 wake_up(&resync_wait
);
6716 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6717 /* no need to wait here, we can wait the next
6718 * time 'round when curr_resync == 2
6721 /* We need to wait 'interruptible' so as not to
6722 * contribute to the load average, and not to
6723 * be caught by 'softlockup'
6725 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6726 if (!kthread_should_stop() &&
6727 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6728 printk(KERN_INFO
"md: delaying %s of %s"
6729 " until %s has finished (they"
6730 " share one or more physical units)\n",
6731 desc
, mdname(mddev
), mdname(mddev2
));
6733 if (signal_pending(current
))
6734 flush_signals(current
);
6736 finish_wait(&resync_wait
, &wq
);
6739 finish_wait(&resync_wait
, &wq
);
6742 } while (mddev
->curr_resync
< 2);
6745 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6746 /* resync follows the size requested by the personality,
6747 * which defaults to physical size, but can be virtual size
6749 max_sectors
= mddev
->resync_max_sectors
;
6750 mddev
->resync_mismatches
= 0;
6751 /* we don't use the checkpoint if there's a bitmap */
6752 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6753 j
= mddev
->resync_min
;
6754 else if (!mddev
->bitmap
)
6755 j
= mddev
->recovery_cp
;
6757 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6758 max_sectors
= mddev
->dev_sectors
;
6760 /* recovery follows the physical size of devices */
6761 max_sectors
= mddev
->dev_sectors
;
6764 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6765 if (rdev
->raid_disk
>= 0 &&
6766 !test_bit(Faulty
, &rdev
->flags
) &&
6767 !test_bit(In_sync
, &rdev
->flags
) &&
6768 rdev
->recovery_offset
< j
)
6769 j
= rdev
->recovery_offset
;
6773 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6774 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6775 " %d KB/sec/disk.\n", speed_min(mddev
));
6776 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6777 "(but not more than %d KB/sec) for %s.\n",
6778 speed_max(mddev
), desc
);
6780 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6783 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6785 mark_cnt
[m
] = io_sectors
;
6788 mddev
->resync_mark
= mark
[last_mark
];
6789 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6792 * Tune reconstruction:
6794 window
= 32*(PAGE_SIZE
/512);
6795 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6796 window
/2,(unsigned long long) max_sectors
/2);
6798 atomic_set(&mddev
->recovery_active
, 0);
6803 "md: resuming %s of %s from checkpoint.\n",
6804 desc
, mdname(mddev
));
6805 mddev
->curr_resync
= j
;
6807 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6809 while (j
< max_sectors
) {
6814 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6815 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6816 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6817 > (max_sectors
>> 4)) ||
6818 (j
- mddev
->curr_resync_completed
)*2
6819 >= mddev
->resync_max
- mddev
->curr_resync_completed
6821 /* time to update curr_resync_completed */
6823 wait_event(mddev
->recovery_wait
,
6824 atomic_read(&mddev
->recovery_active
) == 0);
6825 mddev
->curr_resync_completed
=
6827 if (mddev
->persistent
)
6828 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6829 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6832 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6833 /* As this condition is controlled by user-space,
6834 * we can block indefinitely, so use '_interruptible'
6835 * to avoid triggering warnings.
6837 flush_signals(current
); /* just in case */
6838 wait_event_interruptible(mddev
->recovery_wait
,
6839 mddev
->resync_max
> j
6840 || kthread_should_stop());
6843 if (kthread_should_stop())
6846 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6847 currspeed
< speed_min(mddev
));
6849 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6853 if (!skipped
) { /* actual IO requested */
6854 io_sectors
+= sectors
;
6855 atomic_add(sectors
, &mddev
->recovery_active
);
6859 if (j
>1) mddev
->curr_resync
= j
;
6860 mddev
->curr_mark_cnt
= io_sectors
;
6861 if (last_check
== 0)
6862 /* this is the earliers that rebuilt will be
6863 * visible in /proc/mdstat
6865 md_new_event(mddev
);
6867 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6870 last_check
= io_sectors
;
6872 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6876 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6878 int next
= (last_mark
+1) % SYNC_MARKS
;
6880 mddev
->resync_mark
= mark
[next
];
6881 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6882 mark
[next
] = jiffies
;
6883 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6888 if (kthread_should_stop())
6893 * this loop exits only if either when we are slower than
6894 * the 'hard' speed limit, or the system was IO-idle for
6896 * the system might be non-idle CPU-wise, but we only care
6897 * about not overloading the IO subsystem. (things like an
6898 * e2fsck being done on the RAID array should execute fast)
6903 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6904 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6906 if (currspeed
> speed_min(mddev
)) {
6907 if ((currspeed
> speed_max(mddev
)) ||
6908 !is_mddev_idle(mddev
, 0)) {
6914 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6916 * this also signals 'finished resyncing' to md_stop
6921 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6923 /* tell personality that we are finished */
6924 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6926 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6927 mddev
->curr_resync
> 2) {
6928 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6929 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6930 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6932 "md: checkpointing %s of %s.\n",
6933 desc
, mdname(mddev
));
6934 mddev
->recovery_cp
= mddev
->curr_resync
;
6937 mddev
->recovery_cp
= MaxSector
;
6939 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6940 mddev
->curr_resync
= MaxSector
;
6942 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6943 if (rdev
->raid_disk
>= 0 &&
6944 mddev
->delta_disks
>= 0 &&
6945 !test_bit(Faulty
, &rdev
->flags
) &&
6946 !test_bit(In_sync
, &rdev
->flags
) &&
6947 rdev
->recovery_offset
< mddev
->curr_resync
)
6948 rdev
->recovery_offset
= mddev
->curr_resync
;
6952 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6955 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6956 /* We completed so min/max setting can be forgotten if used. */
6957 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6958 mddev
->resync_min
= 0;
6959 mddev
->resync_max
= MaxSector
;
6960 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6961 mddev
->resync_min
= mddev
->curr_resync_completed
;
6962 mddev
->curr_resync
= 0;
6963 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6964 mddev
->curr_resync_completed
= 0;
6965 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6966 wake_up(&resync_wait
);
6967 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6968 md_wakeup_thread(mddev
->thread
);
6973 * got a signal, exit.
6976 "md: md_do_sync() got signal ... exiting\n");
6977 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6981 EXPORT_SYMBOL_GPL(md_do_sync
);
6984 static int remove_and_add_spares(mddev_t
*mddev
)
6989 mddev
->curr_resync_completed
= 0;
6991 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6992 if (rdev
->raid_disk
>= 0 &&
6993 !test_bit(Blocked
, &rdev
->flags
) &&
6994 (test_bit(Faulty
, &rdev
->flags
) ||
6995 ! test_bit(In_sync
, &rdev
->flags
)) &&
6996 atomic_read(&rdev
->nr_pending
)==0) {
6997 if (mddev
->pers
->hot_remove_disk(
6998 mddev
, rdev
->raid_disk
)==0) {
7000 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7001 sysfs_remove_link(&mddev
->kobj
, nm
);
7002 rdev
->raid_disk
= -1;
7006 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
7007 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7008 if (rdev
->raid_disk
>= 0 &&
7009 !test_bit(In_sync
, &rdev
->flags
) &&
7010 !test_bit(Blocked
, &rdev
->flags
))
7012 if (rdev
->raid_disk
< 0
7013 && !test_bit(Faulty
, &rdev
->flags
)) {
7014 rdev
->recovery_offset
= 0;
7016 hot_add_disk(mddev
, rdev
) == 0) {
7018 sprintf(nm
, "rd%d", rdev
->raid_disk
);
7019 if (sysfs_create_link(&mddev
->kobj
,
7021 /* failure here is OK */;
7023 md_new_event(mddev
);
7024 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7033 * This routine is regularly called by all per-raid-array threads to
7034 * deal with generic issues like resync and super-block update.
7035 * Raid personalities that don't have a thread (linear/raid0) do not
7036 * need this as they never do any recovery or update the superblock.
7038 * It does not do any resync itself, but rather "forks" off other threads
7039 * to do that as needed.
7040 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7041 * "->recovery" and create a thread at ->sync_thread.
7042 * When the thread finishes it sets MD_RECOVERY_DONE
7043 * and wakeups up this thread which will reap the thread and finish up.
7044 * This thread also removes any faulty devices (with nr_pending == 0).
7046 * The overall approach is:
7047 * 1/ if the superblock needs updating, update it.
7048 * 2/ If a recovery thread is running, don't do anything else.
7049 * 3/ If recovery has finished, clean up, possibly marking spares active.
7050 * 4/ If there are any faulty devices, remove them.
7051 * 5/ If array is degraded, try to add spares devices
7052 * 6/ If array has spares or is not in-sync, start a resync thread.
7054 void md_check_recovery(mddev_t
*mddev
)
7060 bitmap_daemon_work(mddev
);
7065 if (signal_pending(current
)) {
7066 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7067 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7069 mddev
->safemode
= 2;
7071 flush_signals(current
);
7074 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7077 (mddev
->flags
&& !mddev
->external
) ||
7078 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7079 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7080 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7081 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7082 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7086 if (mddev_trylock(mddev
)) {
7090 /* Only thing we do on a ro array is remove
7093 remove_and_add_spares(mddev
);
7094 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7098 if (!mddev
->external
) {
7100 spin_lock_irq(&mddev
->write_lock
);
7101 if (mddev
->safemode
&&
7102 !atomic_read(&mddev
->writes_pending
) &&
7104 mddev
->recovery_cp
== MaxSector
) {
7107 if (mddev
->persistent
)
7108 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7110 if (mddev
->safemode
== 1)
7111 mddev
->safemode
= 0;
7112 spin_unlock_irq(&mddev
->write_lock
);
7114 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7118 md_update_sb(mddev
, 0);
7120 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7121 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7122 /* resync/recovery still happening */
7123 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7126 if (mddev
->sync_thread
) {
7127 /* resync has finished, collect result */
7128 md_unregister_thread(mddev
->sync_thread
);
7129 mddev
->sync_thread
= NULL
;
7130 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7131 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7133 /* activate any spares */
7134 if (mddev
->pers
->spare_active(mddev
))
7135 sysfs_notify(&mddev
->kobj
, NULL
,
7138 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7139 mddev
->pers
->finish_reshape
)
7140 mddev
->pers
->finish_reshape(mddev
);
7141 md_update_sb(mddev
, 1);
7143 /* if array is no-longer degraded, then any saved_raid_disk
7144 * information must be scrapped
7146 if (!mddev
->degraded
)
7147 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7148 rdev
->saved_raid_disk
= -1;
7150 mddev
->recovery
= 0;
7151 /* flag recovery needed just to double check */
7152 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7153 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7154 md_new_event(mddev
);
7157 /* Set RUNNING before clearing NEEDED to avoid
7158 * any transients in the value of "sync_action".
7160 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7161 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7162 /* Clear some bits that don't mean anything, but
7165 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7166 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7168 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7170 /* no recovery is running.
7171 * remove any failed drives, then
7172 * add spares if possible.
7173 * Spare are also removed and re-added, to allow
7174 * the personality to fail the re-add.
7177 if (mddev
->reshape_position
!= MaxSector
) {
7178 if (mddev
->pers
->check_reshape
== NULL
||
7179 mddev
->pers
->check_reshape(mddev
) != 0)
7180 /* Cannot proceed */
7182 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7183 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7184 } else if ((spares
= remove_and_add_spares(mddev
))) {
7185 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7186 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7187 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7188 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7189 } else if (mddev
->recovery_cp
< MaxSector
) {
7190 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7191 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7192 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7193 /* nothing to be done ... */
7196 if (mddev
->pers
->sync_request
) {
7197 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7198 /* We are adding a device or devices to an array
7199 * which has the bitmap stored on all devices.
7200 * So make sure all bitmap pages get written
7202 bitmap_write_all(mddev
->bitmap
);
7204 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7207 if (!mddev
->sync_thread
) {
7208 printk(KERN_ERR
"%s: could not start resync"
7211 /* leave the spares where they are, it shouldn't hurt */
7212 mddev
->recovery
= 0;
7214 md_wakeup_thread(mddev
->sync_thread
);
7215 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7216 md_new_event(mddev
);
7219 if (!mddev
->sync_thread
) {
7220 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7221 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7223 if (mddev
->sysfs_action
)
7224 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7226 mddev_unlock(mddev
);
7230 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7232 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7233 wait_event_timeout(rdev
->blocked_wait
,
7234 !test_bit(Blocked
, &rdev
->flags
),
7235 msecs_to_jiffies(5000));
7236 rdev_dec_pending(rdev
, mddev
);
7238 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7240 static int md_notify_reboot(struct notifier_block
*this,
7241 unsigned long code
, void *x
)
7243 struct list_head
*tmp
;
7246 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7248 printk(KERN_INFO
"md: stopping all md devices.\n");
7250 for_each_mddev(mddev
, tmp
)
7251 if (mddev_trylock(mddev
)) {
7252 /* Force a switch to readonly even array
7253 * appears to still be in use. Hence
7256 md_set_readonly(mddev
, 100);
7257 mddev_unlock(mddev
);
7260 * certain more exotic SCSI devices are known to be
7261 * volatile wrt too early system reboots. While the
7262 * right place to handle this issue is the given
7263 * driver, we do want to have a safe RAID driver ...
7270 static struct notifier_block md_notifier
= {
7271 .notifier_call
= md_notify_reboot
,
7273 .priority
= INT_MAX
, /* before any real devices */
7276 static void md_geninit(void)
7278 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7280 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7283 static int __init
md_init(void)
7285 if (register_blkdev(MD_MAJOR
, "md"))
7287 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
7288 unregister_blkdev(MD_MAJOR
, "md");
7291 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7292 md_probe
, NULL
, NULL
);
7293 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7294 md_probe
, NULL
, NULL
);
7296 register_reboot_notifier(&md_notifier
);
7297 raid_table_header
= register_sysctl_table(raid_root_table
);
7307 * Searches all registered partitions for autorun RAID arrays
7311 static LIST_HEAD(all_detected_devices
);
7312 struct detected_devices_node
{
7313 struct list_head list
;
7317 void md_autodetect_dev(dev_t dev
)
7319 struct detected_devices_node
*node_detected_dev
;
7321 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7322 if (node_detected_dev
) {
7323 node_detected_dev
->dev
= dev
;
7324 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7326 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7327 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7332 static void autostart_arrays(int part
)
7335 struct detected_devices_node
*node_detected_dev
;
7337 int i_scanned
, i_passed
;
7342 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7344 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7346 node_detected_dev
= list_entry(all_detected_devices
.next
,
7347 struct detected_devices_node
, list
);
7348 list_del(&node_detected_dev
->list
);
7349 dev
= node_detected_dev
->dev
;
7350 kfree(node_detected_dev
);
7351 rdev
= md_import_device(dev
,0, 90);
7355 if (test_bit(Faulty
, &rdev
->flags
)) {
7359 set_bit(AutoDetected
, &rdev
->flags
);
7360 list_add(&rdev
->same_set
, &pending_raid_disks
);
7364 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7365 i_scanned
, i_passed
);
7367 autorun_devices(part
);
7370 #endif /* !MODULE */
7372 static __exit
void md_exit(void)
7375 struct list_head
*tmp
;
7377 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7378 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7380 unregister_blkdev(MD_MAJOR
,"md");
7381 unregister_blkdev(mdp_major
, "mdp");
7382 unregister_reboot_notifier(&md_notifier
);
7383 unregister_sysctl_table(raid_table_header
);
7384 remove_proc_entry("mdstat", NULL
);
7385 for_each_mddev(mddev
, tmp
) {
7386 export_array(mddev
);
7387 mddev
->hold_active
= 0;
7391 subsys_initcall(md_init
);
7392 module_exit(md_exit
)
7394 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7396 return sprintf(buffer
, "%d", start_readonly
);
7398 static int set_ro(const char *val
, struct kernel_param
*kp
)
7401 int num
= simple_strtoul(val
, &e
, 10);
7402 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7403 start_readonly
= num
;
7409 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7410 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7412 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7414 EXPORT_SYMBOL(register_md_personality
);
7415 EXPORT_SYMBOL(unregister_md_personality
);
7416 EXPORT_SYMBOL(md_error
);
7417 EXPORT_SYMBOL(md_done_sync
);
7418 EXPORT_SYMBOL(md_write_start
);
7419 EXPORT_SYMBOL(md_write_end
);
7420 EXPORT_SYMBOL(md_register_thread
);
7421 EXPORT_SYMBOL(md_unregister_thread
);
7422 EXPORT_SYMBOL(md_wakeup_thread
);
7423 EXPORT_SYMBOL(md_check_recovery
);
7424 MODULE_LICENSE("GPL");
7425 MODULE_DESCRIPTION("MD RAID framework");
7427 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);