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/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
48 #include <linux/raid/md_p.h>
49 #include <linux/raid/md_u.h>
54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
58 static void autostart_arrays(int part
);
61 static LIST_HEAD(pers_list
);
62 static DEFINE_SPINLOCK(pers_lock
);
64 static void md_print_devices(void);
66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
71 * Default number of read corrections we'll attempt on an rdev
72 * before ejecting it from the array. We divide the read error
73 * count by 2 for every hour elapsed between read errors.
75 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
77 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
78 * is 1000 KB/sec, so the extra system load does not show up that much.
79 * Increase it if you want to have more _guaranteed_ speed. Note that
80 * the RAID driver will use the maximum available bandwidth if the IO
81 * subsystem is idle. There is also an 'absolute maximum' reconstruction
82 * speed limit - in case reconstruction slows down your system despite
85 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
86 * or /sys/block/mdX/md/sync_speed_{min,max}
89 static int sysctl_speed_limit_min
= 1000;
90 static int sysctl_speed_limit_max
= 200000;
91 static inline int speed_min(mddev_t
*mddev
)
93 return mddev
->sync_speed_min
?
94 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
97 static inline int speed_max(mddev_t
*mddev
)
99 return mddev
->sync_speed_max
?
100 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
103 static struct ctl_table_header
*raid_table_header
;
105 static ctl_table raid_table
[] = {
107 .procname
= "speed_limit_min",
108 .data
= &sysctl_speed_limit_min
,
109 .maxlen
= sizeof(int),
110 .mode
= S_IRUGO
|S_IWUSR
,
111 .proc_handler
= proc_dointvec
,
114 .procname
= "speed_limit_max",
115 .data
= &sysctl_speed_limit_max
,
116 .maxlen
= sizeof(int),
117 .mode
= S_IRUGO
|S_IWUSR
,
118 .proc_handler
= proc_dointvec
,
123 static ctl_table raid_dir_table
[] = {
127 .mode
= S_IRUGO
|S_IXUGO
,
133 static ctl_table raid_root_table
[] = {
138 .child
= raid_dir_table
,
143 static const struct block_device_operations md_fops
;
145 static int start_readonly
;
148 * We have a system wide 'event count' that is incremented
149 * on any 'interesting' event, and readers of /proc/mdstat
150 * can use 'poll' or 'select' to find out when the event
154 * start array, stop array, error, add device, remove device,
155 * start build, activate spare
157 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
158 static atomic_t md_event_count
;
159 void md_new_event(mddev_t
*mddev
)
161 atomic_inc(&md_event_count
);
162 wake_up(&md_event_waiters
);
164 EXPORT_SYMBOL_GPL(md_new_event
);
166 /* Alternate version that can be called from interrupts
167 * when calling sysfs_notify isn't needed.
169 static void md_new_event_inintr(mddev_t
*mddev
)
171 atomic_inc(&md_event_count
);
172 wake_up(&md_event_waiters
);
176 * Enables to iterate over all existing md arrays
177 * all_mddevs_lock protects this list.
179 static LIST_HEAD(all_mddevs
);
180 static DEFINE_SPINLOCK(all_mddevs_lock
);
184 * iterates through all used mddevs in the system.
185 * We take care to grab the all_mddevs_lock whenever navigating
186 * the list, and to always hold a refcount when unlocked.
187 * Any code which breaks out of this loop while own
188 * a reference to the current mddev and must mddev_put it.
190 #define for_each_mddev(mddev,tmp) \
192 for (({ spin_lock(&all_mddevs_lock); \
193 tmp = all_mddevs.next; \
195 ({ if (tmp != &all_mddevs) \
196 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
197 spin_unlock(&all_mddevs_lock); \
198 if (mddev) mddev_put(mddev); \
199 mddev = list_entry(tmp, mddev_t, all_mddevs); \
200 tmp != &all_mddevs;}); \
201 ({ spin_lock(&all_mddevs_lock); \
206 /* Rather than calling directly into the personality make_request function,
207 * IO requests come here first so that we can check if the device is
208 * being suspended pending a reconfiguration.
209 * We hold a refcount over the call to ->make_request. By the time that
210 * call has finished, the bio has been linked into some internal structure
211 * and so is visible to ->quiesce(), so we don't need the refcount any more.
213 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
215 mddev_t
*mddev
= q
->queuedata
;
217 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
222 if (mddev
->suspended
|| mddev
->barrier
) {
225 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
226 TASK_UNINTERRUPTIBLE
);
227 if (!mddev
->suspended
&& !mddev
->barrier
)
233 finish_wait(&mddev
->sb_wait
, &__wait
);
235 atomic_inc(&mddev
->active_io
);
237 rv
= mddev
->pers
->make_request(q
, bio
);
238 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
239 wake_up(&mddev
->sb_wait
);
244 static void mddev_suspend(mddev_t
*mddev
)
246 BUG_ON(mddev
->suspended
);
247 mddev
->suspended
= 1;
249 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
250 mddev
->pers
->quiesce(mddev
, 1);
251 md_unregister_thread(mddev
->thread
);
252 mddev
->thread
= NULL
;
253 /* we now know that no code is executing in the personality module,
254 * except possibly the tail end of a ->bi_end_io function, but that
255 * is certain to complete before the module has a chance to get
260 static void mddev_resume(mddev_t
*mddev
)
262 mddev
->suspended
= 0;
263 wake_up(&mddev
->sb_wait
);
264 mddev
->pers
->quiesce(mddev
, 0);
267 int mddev_congested(mddev_t
*mddev
, int bits
)
271 return mddev
->suspended
;
273 EXPORT_SYMBOL(mddev_congested
);
276 * Generic barrier handling for md
279 #define POST_REQUEST_BARRIER ((void*)1)
281 static void md_end_barrier(struct bio
*bio
, int err
)
283 mdk_rdev_t
*rdev
= bio
->bi_private
;
284 mddev_t
*mddev
= rdev
->mddev
;
285 if (err
== -EOPNOTSUPP
&& mddev
->barrier
!= POST_REQUEST_BARRIER
)
286 set_bit(BIO_EOPNOTSUPP
, &mddev
->barrier
->bi_flags
);
288 rdev_dec_pending(rdev
, mddev
);
290 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
291 if (mddev
->barrier
== POST_REQUEST_BARRIER
) {
292 /* This was a post-request barrier */
293 mddev
->barrier
= NULL
;
294 wake_up(&mddev
->sb_wait
);
296 /* The pre-request barrier has finished */
297 schedule_work(&mddev
->barrier_work
);
302 static void submit_barriers(mddev_t
*mddev
)
307 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
308 if (rdev
->raid_disk
>= 0 &&
309 !test_bit(Faulty
, &rdev
->flags
)) {
310 /* Take two references, one is dropped
311 * when request finishes, one after
312 * we reclaim rcu_read_lock
315 atomic_inc(&rdev
->nr_pending
);
316 atomic_inc(&rdev
->nr_pending
);
318 bi
= bio_alloc(GFP_KERNEL
, 0);
319 bi
->bi_end_io
= md_end_barrier
;
320 bi
->bi_private
= rdev
;
321 bi
->bi_bdev
= rdev
->bdev
;
322 atomic_inc(&mddev
->flush_pending
);
323 submit_bio(WRITE_BARRIER
, bi
);
325 rdev_dec_pending(rdev
, mddev
);
330 static void md_submit_barrier(struct work_struct
*ws
)
332 mddev_t
*mddev
= container_of(ws
, mddev_t
, barrier_work
);
333 struct bio
*bio
= mddev
->barrier
;
335 atomic_set(&mddev
->flush_pending
, 1);
337 if (test_bit(BIO_EOPNOTSUPP
, &bio
->bi_flags
))
338 bio_endio(bio
, -EOPNOTSUPP
);
339 else if (bio
->bi_size
== 0)
340 /* an empty barrier - all done */
343 bio
->bi_rw
&= ~(1<<BIO_RW_BARRIER
);
344 if (mddev
->pers
->make_request(mddev
->queue
, bio
))
345 generic_make_request(bio
);
346 mddev
->barrier
= POST_REQUEST_BARRIER
;
347 submit_barriers(mddev
);
349 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
350 mddev
->barrier
= NULL
;
351 wake_up(&mddev
->sb_wait
);
355 void md_barrier_request(mddev_t
*mddev
, struct bio
*bio
)
357 spin_lock_irq(&mddev
->write_lock
);
358 wait_event_lock_irq(mddev
->sb_wait
,
360 mddev
->write_lock
, /*nothing*/);
361 mddev
->barrier
= bio
;
362 spin_unlock_irq(&mddev
->write_lock
);
364 atomic_set(&mddev
->flush_pending
, 1);
365 INIT_WORK(&mddev
->barrier_work
, md_submit_barrier
);
367 submit_barriers(mddev
);
369 if (atomic_dec_and_test(&mddev
->flush_pending
))
370 schedule_work(&mddev
->barrier_work
);
372 EXPORT_SYMBOL(md_barrier_request
);
374 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
376 atomic_inc(&mddev
->active
);
380 static void mddev_delayed_delete(struct work_struct
*ws
);
382 static void mddev_put(mddev_t
*mddev
)
384 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
386 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
387 !mddev
->hold_active
) {
388 list_del(&mddev
->all_mddevs
);
389 if (mddev
->gendisk
) {
390 /* we did a probe so need to clean up.
391 * Call schedule_work inside the spinlock
392 * so that flush_scheduled_work() after
393 * mddev_find will succeed in waiting for the
396 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
397 schedule_work(&mddev
->del_work
);
401 spin_unlock(&all_mddevs_lock
);
404 static mddev_t
* mddev_find(dev_t unit
)
406 mddev_t
*mddev
, *new = NULL
;
409 spin_lock(&all_mddevs_lock
);
412 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
413 if (mddev
->unit
== unit
) {
415 spin_unlock(&all_mddevs_lock
);
421 list_add(&new->all_mddevs
, &all_mddevs
);
422 spin_unlock(&all_mddevs_lock
);
423 new->hold_active
= UNTIL_IOCTL
;
427 /* find an unused unit number */
428 static int next_minor
= 512;
429 int start
= next_minor
;
433 dev
= MKDEV(MD_MAJOR
, next_minor
);
435 if (next_minor
> MINORMASK
)
437 if (next_minor
== start
) {
438 /* Oh dear, all in use. */
439 spin_unlock(&all_mddevs_lock
);
445 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
446 if (mddev
->unit
== dev
) {
452 new->md_minor
= MINOR(dev
);
453 new->hold_active
= UNTIL_STOP
;
454 list_add(&new->all_mddevs
, &all_mddevs
);
455 spin_unlock(&all_mddevs_lock
);
458 spin_unlock(&all_mddevs_lock
);
460 new = kzalloc(sizeof(*new), GFP_KERNEL
);
465 if (MAJOR(unit
) == MD_MAJOR
)
466 new->md_minor
= MINOR(unit
);
468 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
470 mutex_init(&new->open_mutex
);
471 mutex_init(&new->reconfig_mutex
);
472 mutex_init(&new->bitmap_info
.mutex
);
473 INIT_LIST_HEAD(&new->disks
);
474 INIT_LIST_HEAD(&new->all_mddevs
);
475 init_timer(&new->safemode_timer
);
476 atomic_set(&new->active
, 1);
477 atomic_set(&new->openers
, 0);
478 atomic_set(&new->active_io
, 0);
479 spin_lock_init(&new->write_lock
);
480 atomic_set(&new->flush_pending
, 0);
481 init_waitqueue_head(&new->sb_wait
);
482 init_waitqueue_head(&new->recovery_wait
);
483 new->reshape_position
= MaxSector
;
485 new->resync_max
= MaxSector
;
486 new->level
= LEVEL_NONE
;
491 static inline int mddev_lock(mddev_t
* mddev
)
493 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
496 static inline int mddev_is_locked(mddev_t
*mddev
)
498 return mutex_is_locked(&mddev
->reconfig_mutex
);
501 static inline int mddev_trylock(mddev_t
* mddev
)
503 return mutex_trylock(&mddev
->reconfig_mutex
);
506 static inline void mddev_unlock(mddev_t
* mddev
)
508 mutex_unlock(&mddev
->reconfig_mutex
);
510 md_wakeup_thread(mddev
->thread
);
513 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
517 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
518 if (rdev
->desc_nr
== nr
)
524 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
528 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
529 if (rdev
->bdev
->bd_dev
== dev
)
535 static struct mdk_personality
*find_pers(int level
, char *clevel
)
537 struct mdk_personality
*pers
;
538 list_for_each_entry(pers
, &pers_list
, list
) {
539 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
541 if (strcmp(pers
->name
, clevel
)==0)
547 /* return the offset of the super block in 512byte sectors */
548 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
550 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
551 return MD_NEW_SIZE_SECTORS(num_sectors
);
554 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
559 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
560 if (!rdev
->sb_page
) {
561 printk(KERN_ALERT
"md: out of memory.\n");
568 static void free_disk_sb(mdk_rdev_t
* rdev
)
571 put_page(rdev
->sb_page
);
573 rdev
->sb_page
= NULL
;
580 static void super_written(struct bio
*bio
, int error
)
582 mdk_rdev_t
*rdev
= bio
->bi_private
;
583 mddev_t
*mddev
= rdev
->mddev
;
585 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
586 printk("md: super_written gets error=%d, uptodate=%d\n",
587 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
588 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
589 md_error(mddev
, rdev
);
592 if (atomic_dec_and_test(&mddev
->pending_writes
))
593 wake_up(&mddev
->sb_wait
);
597 static void super_written_barrier(struct bio
*bio
, int error
)
599 struct bio
*bio2
= bio
->bi_private
;
600 mdk_rdev_t
*rdev
= bio2
->bi_private
;
601 mddev_t
*mddev
= rdev
->mddev
;
603 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
604 error
== -EOPNOTSUPP
) {
606 /* barriers don't appear to be supported :-( */
607 set_bit(BarriersNotsupp
, &rdev
->flags
);
608 mddev
->barriers_work
= 0;
609 spin_lock_irqsave(&mddev
->write_lock
, flags
);
610 bio2
->bi_next
= mddev
->biolist
;
611 mddev
->biolist
= bio2
;
612 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
613 wake_up(&mddev
->sb_wait
);
617 bio
->bi_private
= rdev
;
618 super_written(bio
, error
);
622 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
623 sector_t sector
, int size
, struct page
*page
)
625 /* write first size bytes of page to sector of rdev
626 * Increment mddev->pending_writes before returning
627 * and decrement it on completion, waking up sb_wait
628 * if zero is reached.
629 * If an error occurred, call md_error
631 * As we might need to resubmit the request if BIO_RW_BARRIER
632 * causes ENOTSUPP, we allocate a spare bio...
634 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
635 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNCIO
) | (1<<BIO_RW_UNPLUG
);
637 bio
->bi_bdev
= rdev
->bdev
;
638 bio
->bi_sector
= sector
;
639 bio_add_page(bio
, page
, size
, 0);
640 bio
->bi_private
= rdev
;
641 bio
->bi_end_io
= super_written
;
644 atomic_inc(&mddev
->pending_writes
);
645 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
647 rw
|= (1<<BIO_RW_BARRIER
);
648 rbio
= bio_clone(bio
, GFP_NOIO
);
649 rbio
->bi_private
= bio
;
650 rbio
->bi_end_io
= super_written_barrier
;
651 submit_bio(rw
, rbio
);
656 void md_super_wait(mddev_t
*mddev
)
658 /* wait for all superblock writes that were scheduled to complete.
659 * if any had to be retried (due to BARRIER problems), retry them
663 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
664 if (atomic_read(&mddev
->pending_writes
)==0)
666 while (mddev
->biolist
) {
668 spin_lock_irq(&mddev
->write_lock
);
669 bio
= mddev
->biolist
;
670 mddev
->biolist
= bio
->bi_next
;
672 spin_unlock_irq(&mddev
->write_lock
);
673 submit_bio(bio
->bi_rw
, bio
);
677 finish_wait(&mddev
->sb_wait
, &wq
);
680 static void bi_complete(struct bio
*bio
, int error
)
682 complete((struct completion
*)bio
->bi_private
);
685 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
686 struct page
*page
, int rw
)
688 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
689 struct completion event
;
692 rw
|= (1 << BIO_RW_SYNCIO
) | (1 << BIO_RW_UNPLUG
);
695 bio
->bi_sector
= sector
;
696 bio_add_page(bio
, page
, size
, 0);
697 init_completion(&event
);
698 bio
->bi_private
= &event
;
699 bio
->bi_end_io
= bi_complete
;
701 wait_for_completion(&event
);
703 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
707 EXPORT_SYMBOL_GPL(sync_page_io
);
709 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
711 char b
[BDEVNAME_SIZE
];
712 if (!rdev
->sb_page
) {
720 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
726 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
727 bdevname(rdev
->bdev
,b
));
731 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
733 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
734 sb1
->set_uuid1
== sb2
->set_uuid1
&&
735 sb1
->set_uuid2
== sb2
->set_uuid2
&&
736 sb1
->set_uuid3
== sb2
->set_uuid3
;
739 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
742 mdp_super_t
*tmp1
, *tmp2
;
744 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
745 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
747 if (!tmp1
|| !tmp2
) {
749 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
757 * nr_disks is not constant
762 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
770 static u32
md_csum_fold(u32 csum
)
772 csum
= (csum
& 0xffff) + (csum
>> 16);
773 return (csum
& 0xffff) + (csum
>> 16);
776 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
779 u32
*sb32
= (u32
*)sb
;
781 unsigned int disk_csum
, csum
;
783 disk_csum
= sb
->sb_csum
;
786 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
788 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
792 /* This used to use csum_partial, which was wrong for several
793 * reasons including that different results are returned on
794 * different architectures. It isn't critical that we get exactly
795 * the same return value as before (we always csum_fold before
796 * testing, and that removes any differences). However as we
797 * know that csum_partial always returned a 16bit value on
798 * alphas, do a fold to maximise conformity to previous behaviour.
800 sb
->sb_csum
= md_csum_fold(disk_csum
);
802 sb
->sb_csum
= disk_csum
;
809 * Handle superblock details.
810 * We want to be able to handle multiple superblock formats
811 * so we have a common interface to them all, and an array of
812 * different handlers.
813 * We rely on user-space to write the initial superblock, and support
814 * reading and updating of superblocks.
815 * Interface methods are:
816 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
817 * loads and validates a superblock on dev.
818 * if refdev != NULL, compare superblocks on both devices
820 * 0 - dev has a superblock that is compatible with refdev
821 * 1 - dev has a superblock that is compatible and newer than refdev
822 * so dev should be used as the refdev in future
823 * -EINVAL superblock incompatible or invalid
824 * -othererror e.g. -EIO
826 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
827 * Verify that dev is acceptable into mddev.
828 * The first time, mddev->raid_disks will be 0, and data from
829 * dev should be merged in. Subsequent calls check that dev
830 * is new enough. Return 0 or -EINVAL
832 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
833 * Update the superblock for rdev with data in mddev
834 * This does not write to disc.
840 struct module
*owner
;
841 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
843 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
844 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
845 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
846 sector_t num_sectors
);
850 * Check that the given mddev has no bitmap.
852 * This function is called from the run method of all personalities that do not
853 * support bitmaps. It prints an error message and returns non-zero if mddev
854 * has a bitmap. Otherwise, it returns 0.
857 int md_check_no_bitmap(mddev_t
*mddev
)
859 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
861 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
862 mdname(mddev
), mddev
->pers
->name
);
865 EXPORT_SYMBOL(md_check_no_bitmap
);
868 * load_super for 0.90.0
870 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
872 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
877 * Calculate the position of the superblock (512byte sectors),
878 * it's at the end of the disk.
880 * It also happens to be a multiple of 4Kb.
882 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
884 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
889 bdevname(rdev
->bdev
, b
);
890 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
892 if (sb
->md_magic
!= MD_SB_MAGIC
) {
893 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
898 if (sb
->major_version
!= 0 ||
899 sb
->minor_version
< 90 ||
900 sb
->minor_version
> 91) {
901 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
902 sb
->major_version
, sb
->minor_version
,
907 if (sb
->raid_disks
<= 0)
910 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
911 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
916 rdev
->preferred_minor
= sb
->md_minor
;
917 rdev
->data_offset
= 0;
918 rdev
->sb_size
= MD_SB_BYTES
;
920 if (sb
->level
== LEVEL_MULTIPATH
)
923 rdev
->desc_nr
= sb
->this_disk
.number
;
929 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
930 if (!uuid_equal(refsb
, sb
)) {
931 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
932 b
, bdevname(refdev
->bdev
,b2
));
935 if (!sb_equal(refsb
, sb
)) {
936 printk(KERN_WARNING
"md: %s has same UUID"
937 " but different superblock to %s\n",
938 b
, bdevname(refdev
->bdev
, b2
));
942 ev2
= md_event(refsb
);
948 rdev
->sectors
= rdev
->sb_start
;
950 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
951 /* "this cannot possibly happen" ... */
959 * validate_super for 0.90.0
961 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
964 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
965 __u64 ev1
= md_event(sb
);
967 rdev
->raid_disk
= -1;
968 clear_bit(Faulty
, &rdev
->flags
);
969 clear_bit(In_sync
, &rdev
->flags
);
970 clear_bit(WriteMostly
, &rdev
->flags
);
971 clear_bit(BarriersNotsupp
, &rdev
->flags
);
973 if (mddev
->raid_disks
== 0) {
974 mddev
->major_version
= 0;
975 mddev
->minor_version
= sb
->minor_version
;
976 mddev
->patch_version
= sb
->patch_version
;
978 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
979 mddev
->ctime
= sb
->ctime
;
980 mddev
->utime
= sb
->utime
;
981 mddev
->level
= sb
->level
;
982 mddev
->clevel
[0] = 0;
983 mddev
->layout
= sb
->layout
;
984 mddev
->raid_disks
= sb
->raid_disks
;
985 mddev
->dev_sectors
= sb
->size
* 2;
987 mddev
->bitmap_info
.offset
= 0;
988 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
990 if (mddev
->minor_version
>= 91) {
991 mddev
->reshape_position
= sb
->reshape_position
;
992 mddev
->delta_disks
= sb
->delta_disks
;
993 mddev
->new_level
= sb
->new_level
;
994 mddev
->new_layout
= sb
->new_layout
;
995 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
997 mddev
->reshape_position
= MaxSector
;
998 mddev
->delta_disks
= 0;
999 mddev
->new_level
= mddev
->level
;
1000 mddev
->new_layout
= mddev
->layout
;
1001 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1004 if (sb
->state
& (1<<MD_SB_CLEAN
))
1005 mddev
->recovery_cp
= MaxSector
;
1007 if (sb
->events_hi
== sb
->cp_events_hi
&&
1008 sb
->events_lo
== sb
->cp_events_lo
) {
1009 mddev
->recovery_cp
= sb
->recovery_cp
;
1011 mddev
->recovery_cp
= 0;
1014 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1015 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1016 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1017 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1019 mddev
->max_disks
= MD_SB_DISKS
;
1021 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1022 mddev
->bitmap_info
.file
== NULL
)
1023 mddev
->bitmap_info
.offset
=
1024 mddev
->bitmap_info
.default_offset
;
1026 } else if (mddev
->pers
== NULL
) {
1027 /* Insist on good event counter while assembling */
1029 if (ev1
< mddev
->events
)
1031 } else if (mddev
->bitmap
) {
1032 /* if adding to array with a bitmap, then we can accept an
1033 * older device ... but not too old.
1035 if (ev1
< mddev
->bitmap
->events_cleared
)
1038 if (ev1
< mddev
->events
)
1039 /* just a hot-add of a new device, leave raid_disk at -1 */
1043 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1044 desc
= sb
->disks
+ rdev
->desc_nr
;
1046 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1047 set_bit(Faulty
, &rdev
->flags
);
1048 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1049 desc->raid_disk < mddev->raid_disks */) {
1050 set_bit(In_sync
, &rdev
->flags
);
1051 rdev
->raid_disk
= desc
->raid_disk
;
1052 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1053 /* active but not in sync implies recovery up to
1054 * reshape position. We don't know exactly where
1055 * that is, so set to zero for now */
1056 if (mddev
->minor_version
>= 91) {
1057 rdev
->recovery_offset
= 0;
1058 rdev
->raid_disk
= desc
->raid_disk
;
1061 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1062 set_bit(WriteMostly
, &rdev
->flags
);
1063 } else /* MULTIPATH are always insync */
1064 set_bit(In_sync
, &rdev
->flags
);
1069 * sync_super for 0.90.0
1071 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1075 int next_spare
= mddev
->raid_disks
;
1078 /* make rdev->sb match mddev data..
1081 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1082 * 3/ any empty disks < next_spare become removed
1084 * disks[0] gets initialised to REMOVED because
1085 * we cannot be sure from other fields if it has
1086 * been initialised or not.
1089 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1091 rdev
->sb_size
= MD_SB_BYTES
;
1093 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1095 memset(sb
, 0, sizeof(*sb
));
1097 sb
->md_magic
= MD_SB_MAGIC
;
1098 sb
->major_version
= mddev
->major_version
;
1099 sb
->patch_version
= mddev
->patch_version
;
1100 sb
->gvalid_words
= 0; /* ignored */
1101 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1102 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1103 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1104 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1106 sb
->ctime
= mddev
->ctime
;
1107 sb
->level
= mddev
->level
;
1108 sb
->size
= mddev
->dev_sectors
/ 2;
1109 sb
->raid_disks
= mddev
->raid_disks
;
1110 sb
->md_minor
= mddev
->md_minor
;
1111 sb
->not_persistent
= 0;
1112 sb
->utime
= mddev
->utime
;
1114 sb
->events_hi
= (mddev
->events
>>32);
1115 sb
->events_lo
= (u32
)mddev
->events
;
1117 if (mddev
->reshape_position
== MaxSector
)
1118 sb
->minor_version
= 90;
1120 sb
->minor_version
= 91;
1121 sb
->reshape_position
= mddev
->reshape_position
;
1122 sb
->new_level
= mddev
->new_level
;
1123 sb
->delta_disks
= mddev
->delta_disks
;
1124 sb
->new_layout
= mddev
->new_layout
;
1125 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1127 mddev
->minor_version
= sb
->minor_version
;
1130 sb
->recovery_cp
= mddev
->recovery_cp
;
1131 sb
->cp_events_hi
= (mddev
->events
>>32);
1132 sb
->cp_events_lo
= (u32
)mddev
->events
;
1133 if (mddev
->recovery_cp
== MaxSector
)
1134 sb
->state
= (1<< MD_SB_CLEAN
);
1136 sb
->recovery_cp
= 0;
1138 sb
->layout
= mddev
->layout
;
1139 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1141 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1142 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1144 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1145 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1148 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1150 if (rdev2
->raid_disk
>= 0 &&
1151 sb
->minor_version
>= 91)
1152 /* we have nowhere to store the recovery_offset,
1153 * but if it is not below the reshape_position,
1154 * we can piggy-back on that.
1157 if (rdev2
->raid_disk
< 0 ||
1158 test_bit(Faulty
, &rdev2
->flags
))
1161 desc_nr
= rdev2
->raid_disk
;
1163 desc_nr
= next_spare
++;
1164 rdev2
->desc_nr
= desc_nr
;
1165 d
= &sb
->disks
[rdev2
->desc_nr
];
1167 d
->number
= rdev2
->desc_nr
;
1168 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1169 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1171 d
->raid_disk
= rdev2
->raid_disk
;
1173 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1174 if (test_bit(Faulty
, &rdev2
->flags
))
1175 d
->state
= (1<<MD_DISK_FAULTY
);
1176 else if (is_active
) {
1177 d
->state
= (1<<MD_DISK_ACTIVE
);
1178 if (test_bit(In_sync
, &rdev2
->flags
))
1179 d
->state
|= (1<<MD_DISK_SYNC
);
1187 if (test_bit(WriteMostly
, &rdev2
->flags
))
1188 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1190 /* now set the "removed" and "faulty" bits on any missing devices */
1191 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1192 mdp_disk_t
*d
= &sb
->disks
[i
];
1193 if (d
->state
== 0 && d
->number
== 0) {
1196 d
->state
= (1<<MD_DISK_REMOVED
);
1197 d
->state
|= (1<<MD_DISK_FAULTY
);
1201 sb
->nr_disks
= nr_disks
;
1202 sb
->active_disks
= active
;
1203 sb
->working_disks
= working
;
1204 sb
->failed_disks
= failed
;
1205 sb
->spare_disks
= spare
;
1207 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1208 sb
->sb_csum
= calc_sb_csum(sb
);
1212 * rdev_size_change for 0.90.0
1214 static unsigned long long
1215 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1217 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1218 return 0; /* component must fit device */
1219 if (rdev
->mddev
->bitmap_info
.offset
)
1220 return 0; /* can't move bitmap */
1221 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1222 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1223 num_sectors
= rdev
->sb_start
;
1224 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1226 md_super_wait(rdev
->mddev
);
1227 return num_sectors
/ 2; /* kB for sysfs */
1232 * version 1 superblock
1235 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1239 unsigned long long newcsum
;
1240 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1241 __le32
*isuper
= (__le32
*)sb
;
1244 disk_csum
= sb
->sb_csum
;
1247 for (i
=0; size
>=4; size
-= 4 )
1248 newcsum
+= le32_to_cpu(*isuper
++);
1251 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1253 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1254 sb
->sb_csum
= disk_csum
;
1255 return cpu_to_le32(csum
);
1258 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1260 struct mdp_superblock_1
*sb
;
1263 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1267 * Calculate the position of the superblock in 512byte sectors.
1268 * It is always aligned to a 4K boundary and
1269 * depeding on minor_version, it can be:
1270 * 0: At least 8K, but less than 12K, from end of device
1271 * 1: At start of device
1272 * 2: 4K from start of device.
1274 switch(minor_version
) {
1276 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1278 sb_start
&= ~(sector_t
)(4*2-1);
1289 rdev
->sb_start
= sb_start
;
1291 /* superblock is rarely larger than 1K, but it can be larger,
1292 * and it is safe to read 4k, so we do that
1294 ret
= read_disk_sb(rdev
, 4096);
1295 if (ret
) return ret
;
1298 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1300 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1301 sb
->major_version
!= cpu_to_le32(1) ||
1302 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1303 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1304 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1307 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1308 printk("md: invalid superblock checksum on %s\n",
1309 bdevname(rdev
->bdev
,b
));
1312 if (le64_to_cpu(sb
->data_size
) < 10) {
1313 printk("md: data_size too small on %s\n",
1314 bdevname(rdev
->bdev
,b
));
1318 rdev
->preferred_minor
= 0xffff;
1319 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1320 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1322 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1323 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1324 if (rdev
->sb_size
& bmask
)
1325 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1328 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1331 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1334 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1340 struct mdp_superblock_1
*refsb
=
1341 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1343 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1344 sb
->level
!= refsb
->level
||
1345 sb
->layout
!= refsb
->layout
||
1346 sb
->chunksize
!= refsb
->chunksize
) {
1347 printk(KERN_WARNING
"md: %s has strangely different"
1348 " superblock to %s\n",
1349 bdevname(rdev
->bdev
,b
),
1350 bdevname(refdev
->bdev
,b2
));
1353 ev1
= le64_to_cpu(sb
->events
);
1354 ev2
= le64_to_cpu(refsb
->events
);
1362 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1363 le64_to_cpu(sb
->data_offset
);
1365 rdev
->sectors
= rdev
->sb_start
;
1366 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1368 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1369 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1374 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1376 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1377 __u64 ev1
= le64_to_cpu(sb
->events
);
1379 rdev
->raid_disk
= -1;
1380 clear_bit(Faulty
, &rdev
->flags
);
1381 clear_bit(In_sync
, &rdev
->flags
);
1382 clear_bit(WriteMostly
, &rdev
->flags
);
1383 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1385 if (mddev
->raid_disks
== 0) {
1386 mddev
->major_version
= 1;
1387 mddev
->patch_version
= 0;
1388 mddev
->external
= 0;
1389 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1390 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1391 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1392 mddev
->level
= le32_to_cpu(sb
->level
);
1393 mddev
->clevel
[0] = 0;
1394 mddev
->layout
= le32_to_cpu(sb
->layout
);
1395 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1396 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1397 mddev
->events
= ev1
;
1398 mddev
->bitmap_info
.offset
= 0;
1399 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1401 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1402 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1404 mddev
->max_disks
= (4096-256)/2;
1406 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1407 mddev
->bitmap_info
.file
== NULL
)
1408 mddev
->bitmap_info
.offset
=
1409 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1411 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1412 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1413 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1414 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1415 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1416 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1418 mddev
->reshape_position
= MaxSector
;
1419 mddev
->delta_disks
= 0;
1420 mddev
->new_level
= mddev
->level
;
1421 mddev
->new_layout
= mddev
->layout
;
1422 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1425 } else if (mddev
->pers
== NULL
) {
1426 /* Insist of good event counter while assembling */
1428 if (ev1
< mddev
->events
)
1430 } else if (mddev
->bitmap
) {
1431 /* If adding to array with a bitmap, then we can accept an
1432 * older device, but not too old.
1434 if (ev1
< mddev
->bitmap
->events_cleared
)
1437 if (ev1
< mddev
->events
)
1438 /* just a hot-add of a new device, leave raid_disk at -1 */
1441 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1443 if (rdev
->desc_nr
< 0 ||
1444 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1448 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1450 case 0xffff: /* spare */
1452 case 0xfffe: /* faulty */
1453 set_bit(Faulty
, &rdev
->flags
);
1456 if ((le32_to_cpu(sb
->feature_map
) &
1457 MD_FEATURE_RECOVERY_OFFSET
))
1458 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1460 set_bit(In_sync
, &rdev
->flags
);
1461 rdev
->raid_disk
= role
;
1464 if (sb
->devflags
& WriteMostly1
)
1465 set_bit(WriteMostly
, &rdev
->flags
);
1466 } else /* MULTIPATH are always insync */
1467 set_bit(In_sync
, &rdev
->flags
);
1472 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1474 struct mdp_superblock_1
*sb
;
1477 /* make rdev->sb match mddev and rdev data. */
1479 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1481 sb
->feature_map
= 0;
1483 sb
->recovery_offset
= cpu_to_le64(0);
1484 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1485 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1486 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1488 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1489 sb
->events
= cpu_to_le64(mddev
->events
);
1491 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1493 sb
->resync_offset
= cpu_to_le64(0);
1495 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1497 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1498 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1499 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1500 sb
->level
= cpu_to_le32(mddev
->level
);
1501 sb
->layout
= cpu_to_le32(mddev
->layout
);
1503 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1504 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1505 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1508 if (rdev
->raid_disk
>= 0 &&
1509 !test_bit(In_sync
, &rdev
->flags
)) {
1510 if (rdev
->recovery_offset
> 0) {
1512 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1513 sb
->recovery_offset
=
1514 cpu_to_le64(rdev
->recovery_offset
);
1518 if (mddev
->reshape_position
!= MaxSector
) {
1519 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1520 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1521 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1522 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1523 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1524 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1528 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1529 if (rdev2
->desc_nr
+1 > max_dev
)
1530 max_dev
= rdev2
->desc_nr
+1;
1532 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1534 sb
->max_dev
= cpu_to_le32(max_dev
);
1535 rdev
->sb_size
= max_dev
* 2 + 256;
1536 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1537 if (rdev
->sb_size
& bmask
)
1538 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1540 for (i
=0; i
<max_dev
;i
++)
1541 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1543 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1545 if (test_bit(Faulty
, &rdev2
->flags
))
1546 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1547 else if (test_bit(In_sync
, &rdev2
->flags
))
1548 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1549 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1550 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1552 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1555 sb
->sb_csum
= calc_sb_1_csum(sb
);
1558 static unsigned long long
1559 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1561 struct mdp_superblock_1
*sb
;
1562 sector_t max_sectors
;
1563 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1564 return 0; /* component must fit device */
1565 if (rdev
->sb_start
< rdev
->data_offset
) {
1566 /* minor versions 1 and 2; superblock before data */
1567 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1568 max_sectors
-= rdev
->data_offset
;
1569 if (!num_sectors
|| num_sectors
> max_sectors
)
1570 num_sectors
= max_sectors
;
1571 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1572 /* minor version 0 with bitmap we can't move */
1575 /* minor version 0; superblock after data */
1577 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1578 sb_start
&= ~(sector_t
)(4*2 - 1);
1579 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1580 if (!num_sectors
|| num_sectors
> max_sectors
)
1581 num_sectors
= max_sectors
;
1582 rdev
->sb_start
= sb_start
;
1584 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1585 sb
->data_size
= cpu_to_le64(num_sectors
);
1586 sb
->super_offset
= rdev
->sb_start
;
1587 sb
->sb_csum
= calc_sb_1_csum(sb
);
1588 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1590 md_super_wait(rdev
->mddev
);
1591 return num_sectors
/ 2; /* kB for sysfs */
1594 static struct super_type super_types
[] = {
1597 .owner
= THIS_MODULE
,
1598 .load_super
= super_90_load
,
1599 .validate_super
= super_90_validate
,
1600 .sync_super
= super_90_sync
,
1601 .rdev_size_change
= super_90_rdev_size_change
,
1605 .owner
= THIS_MODULE
,
1606 .load_super
= super_1_load
,
1607 .validate_super
= super_1_validate
,
1608 .sync_super
= super_1_sync
,
1609 .rdev_size_change
= super_1_rdev_size_change
,
1613 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1615 mdk_rdev_t
*rdev
, *rdev2
;
1618 rdev_for_each_rcu(rdev
, mddev1
)
1619 rdev_for_each_rcu(rdev2
, mddev2
)
1620 if (rdev
->bdev
->bd_contains
==
1621 rdev2
->bdev
->bd_contains
) {
1629 static LIST_HEAD(pending_raid_disks
);
1632 * Try to register data integrity profile for an mddev
1634 * This is called when an array is started and after a disk has been kicked
1635 * from the array. It only succeeds if all working and active component devices
1636 * are integrity capable with matching profiles.
1638 int md_integrity_register(mddev_t
*mddev
)
1640 mdk_rdev_t
*rdev
, *reference
= NULL
;
1642 if (list_empty(&mddev
->disks
))
1643 return 0; /* nothing to do */
1644 if (blk_get_integrity(mddev
->gendisk
))
1645 return 0; /* already registered */
1646 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1647 /* skip spares and non-functional disks */
1648 if (test_bit(Faulty
, &rdev
->flags
))
1650 if (rdev
->raid_disk
< 0)
1653 * If at least one rdev is not integrity capable, we can not
1654 * enable data integrity for the md device.
1656 if (!bdev_get_integrity(rdev
->bdev
))
1659 /* Use the first rdev as the reference */
1663 /* does this rdev's profile match the reference profile? */
1664 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1665 rdev
->bdev
->bd_disk
) < 0)
1669 * All component devices are integrity capable and have matching
1670 * profiles, register the common profile for the md device.
1672 if (blk_integrity_register(mddev
->gendisk
,
1673 bdev_get_integrity(reference
->bdev
)) != 0) {
1674 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1678 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1682 EXPORT_SYMBOL(md_integrity_register
);
1684 /* Disable data integrity if non-capable/non-matching disk is being added */
1685 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1687 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1688 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1690 if (!bi_mddev
) /* nothing to do */
1692 if (rdev
->raid_disk
< 0) /* skip spares */
1694 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1695 rdev
->bdev
->bd_disk
) >= 0)
1697 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1698 blk_integrity_unregister(mddev
->gendisk
);
1700 EXPORT_SYMBOL(md_integrity_add_rdev
);
1702 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1704 char b
[BDEVNAME_SIZE
];
1714 /* prevent duplicates */
1715 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1718 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1719 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1720 rdev
->sectors
< mddev
->dev_sectors
)) {
1722 /* Cannot change size, so fail
1723 * If mddev->level <= 0, then we don't care
1724 * about aligning sizes (e.g. linear)
1726 if (mddev
->level
> 0)
1729 mddev
->dev_sectors
= rdev
->sectors
;
1732 /* Verify rdev->desc_nr is unique.
1733 * If it is -1, assign a free number, else
1734 * check number is not in use
1736 if (rdev
->desc_nr
< 0) {
1738 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1739 while (find_rdev_nr(mddev
, choice
))
1741 rdev
->desc_nr
= choice
;
1743 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1746 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1747 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1748 mdname(mddev
), mddev
->max_disks
);
1751 bdevname(rdev
->bdev
,b
);
1752 while ( (s
=strchr(b
, '/')) != NULL
)
1755 rdev
->mddev
= mddev
;
1756 printk(KERN_INFO
"md: bind<%s>\n", b
);
1758 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1761 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1762 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1763 kobject_del(&rdev
->kobj
);
1766 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1768 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1769 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1771 /* May as well allow recovery to be retried once */
1772 mddev
->recovery_disabled
= 0;
1777 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1782 static void md_delayed_delete(struct work_struct
*ws
)
1784 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1785 kobject_del(&rdev
->kobj
);
1786 kobject_put(&rdev
->kobj
);
1789 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1791 char b
[BDEVNAME_SIZE
];
1796 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1797 list_del_rcu(&rdev
->same_set
);
1798 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1800 sysfs_remove_link(&rdev
->kobj
, "block");
1801 sysfs_put(rdev
->sysfs_state
);
1802 rdev
->sysfs_state
= NULL
;
1803 /* We need to delay this, otherwise we can deadlock when
1804 * writing to 'remove' to "dev/state". We also need
1805 * to delay it due to rcu usage.
1808 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1809 kobject_get(&rdev
->kobj
);
1810 schedule_work(&rdev
->del_work
);
1814 * prevent the device from being mounted, repartitioned or
1815 * otherwise reused by a RAID array (or any other kernel
1816 * subsystem), by bd_claiming the device.
1818 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1821 struct block_device
*bdev
;
1822 char b
[BDEVNAME_SIZE
];
1824 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1826 printk(KERN_ERR
"md: could not open %s.\n",
1827 __bdevname(dev
, b
));
1828 return PTR_ERR(bdev
);
1830 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1832 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1834 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1838 set_bit(AllReserved
, &rdev
->flags
);
1843 static void unlock_rdev(mdk_rdev_t
*rdev
)
1845 struct block_device
*bdev
= rdev
->bdev
;
1850 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1853 void md_autodetect_dev(dev_t dev
);
1855 static void export_rdev(mdk_rdev_t
* rdev
)
1857 char b
[BDEVNAME_SIZE
];
1858 printk(KERN_INFO
"md: export_rdev(%s)\n",
1859 bdevname(rdev
->bdev
,b
));
1864 if (test_bit(AutoDetected
, &rdev
->flags
))
1865 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1868 kobject_put(&rdev
->kobj
);
1871 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1873 unbind_rdev_from_array(rdev
);
1877 static void export_array(mddev_t
*mddev
)
1879 mdk_rdev_t
*rdev
, *tmp
;
1881 rdev_for_each(rdev
, tmp
, mddev
) {
1886 kick_rdev_from_array(rdev
);
1888 if (!list_empty(&mddev
->disks
))
1890 mddev
->raid_disks
= 0;
1891 mddev
->major_version
= 0;
1894 static void print_desc(mdp_disk_t
*desc
)
1896 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1897 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1900 static void print_sb_90(mdp_super_t
*sb
)
1905 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1906 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1907 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1909 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1910 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1911 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1912 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1913 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1914 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1915 sb
->failed_disks
, sb
->spare_disks
,
1916 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1919 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1922 desc
= sb
->disks
+ i
;
1923 if (desc
->number
|| desc
->major
|| desc
->minor
||
1924 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1925 printk(" D %2d: ", i
);
1929 printk(KERN_INFO
"md: THIS: ");
1930 print_desc(&sb
->this_disk
);
1933 static void print_sb_1(struct mdp_superblock_1
*sb
)
1937 uuid
= sb
->set_uuid
;
1939 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1940 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1941 "md: Name: \"%s\" CT:%llu\n",
1942 le32_to_cpu(sb
->major_version
),
1943 le32_to_cpu(sb
->feature_map
),
1944 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1945 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1946 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1947 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1949 (unsigned long long)le64_to_cpu(sb
->ctime
)
1950 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1952 uuid
= sb
->device_uuid
;
1954 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1956 "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1957 ":%02x%02x%02x%02x%02x%02x\n"
1958 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1959 "md: (MaxDev:%u) \n",
1960 le32_to_cpu(sb
->level
),
1961 (unsigned long long)le64_to_cpu(sb
->size
),
1962 le32_to_cpu(sb
->raid_disks
),
1963 le32_to_cpu(sb
->layout
),
1964 le32_to_cpu(sb
->chunksize
),
1965 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1966 (unsigned long long)le64_to_cpu(sb
->data_size
),
1967 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1968 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1969 le32_to_cpu(sb
->dev_number
),
1970 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1971 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1972 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1973 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1975 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1976 (unsigned long long)le64_to_cpu(sb
->events
),
1977 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1978 le32_to_cpu(sb
->sb_csum
),
1979 le32_to_cpu(sb
->max_dev
)
1983 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1985 char b
[BDEVNAME_SIZE
];
1986 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1987 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
1988 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1990 if (rdev
->sb_loaded
) {
1991 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1992 switch (major_version
) {
1994 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1997 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2001 printk(KERN_INFO
"md: no rdev superblock!\n");
2004 static void md_print_devices(void)
2006 struct list_head
*tmp
;
2009 char b
[BDEVNAME_SIZE
];
2012 printk("md: **********************************\n");
2013 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2014 printk("md: **********************************\n");
2015 for_each_mddev(mddev
, tmp
) {
2018 bitmap_print_sb(mddev
->bitmap
);
2020 printk("%s: ", mdname(mddev
));
2021 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2022 printk("<%s>", bdevname(rdev
->bdev
,b
));
2025 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2026 print_rdev(rdev
, mddev
->major_version
);
2028 printk("md: **********************************\n");
2033 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2035 /* Update each superblock (in-memory image), but
2036 * if we are allowed to, skip spares which already
2037 * have the right event counter, or have one earlier
2038 * (which would mean they aren't being marked as dirty
2039 * with the rest of the array)
2043 /* First make sure individual recovery_offsets are correct */
2044 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2045 if (rdev
->raid_disk
>= 0 &&
2046 !test_bit(In_sync
, &rdev
->flags
) &&
2047 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2048 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2051 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2052 if (rdev
->sb_events
== mddev
->events
||
2054 rdev
->raid_disk
< 0 &&
2055 (rdev
->sb_events
&1)==0 &&
2056 rdev
->sb_events
+1 == mddev
->events
)) {
2057 /* Don't update this superblock */
2058 rdev
->sb_loaded
= 2;
2060 super_types
[mddev
->major_version
].
2061 sync_super(mddev
, rdev
);
2062 rdev
->sb_loaded
= 1;
2067 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2073 mddev
->utime
= get_seconds();
2074 if (mddev
->external
)
2077 spin_lock_irq(&mddev
->write_lock
);
2079 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2080 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2082 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2083 /* just a clean<-> dirty transition, possibly leave spares alone,
2084 * though if events isn't the right even/odd, we will have to do
2090 if (mddev
->degraded
)
2091 /* If the array is degraded, then skipping spares is both
2092 * dangerous and fairly pointless.
2093 * Dangerous because a device that was removed from the array
2094 * might have a event_count that still looks up-to-date,
2095 * so it can be re-added without a resync.
2096 * Pointless because if there are any spares to skip,
2097 * then a recovery will happen and soon that array won't
2098 * be degraded any more and the spare can go back to sleep then.
2102 sync_req
= mddev
->in_sync
;
2104 /* If this is just a dirty<->clean transition, and the array is clean
2105 * and 'events' is odd, we can roll back to the previous clean state */
2107 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2108 && (mddev
->events
& 1)
2109 && mddev
->events
!= 1)
2112 /* otherwise we have to go forward and ... */
2114 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
2115 /* .. if the array isn't clean, an 'even' event must also go
2117 if ((mddev
->events
&1)==0)
2120 /* otherwise an 'odd' event must go to spares */
2121 if ((mddev
->events
&1))
2126 if (!mddev
->events
) {
2128 * oops, this 64-bit counter should never wrap.
2129 * Either we are in around ~1 trillion A.C., assuming
2130 * 1 reboot per second, or we have a bug:
2137 * do not write anything to disk if using
2138 * nonpersistent superblocks
2140 if (!mddev
->persistent
) {
2141 if (!mddev
->external
)
2142 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2144 spin_unlock_irq(&mddev
->write_lock
);
2145 wake_up(&mddev
->sb_wait
);
2148 sync_sbs(mddev
, nospares
);
2149 spin_unlock_irq(&mddev
->write_lock
);
2152 "md: updating %s RAID superblock on device (in sync %d)\n",
2153 mdname(mddev
),mddev
->in_sync
);
2155 bitmap_update_sb(mddev
->bitmap
);
2156 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2157 char b
[BDEVNAME_SIZE
];
2158 dprintk(KERN_INFO
"md: ");
2159 if (rdev
->sb_loaded
!= 1)
2160 continue; /* no noise on spare devices */
2161 if (test_bit(Faulty
, &rdev
->flags
))
2162 dprintk("(skipping faulty ");
2164 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2165 if (!test_bit(Faulty
, &rdev
->flags
)) {
2166 md_super_write(mddev
,rdev
,
2167 rdev
->sb_start
, rdev
->sb_size
,
2169 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2170 bdevname(rdev
->bdev
,b
),
2171 (unsigned long long)rdev
->sb_start
);
2172 rdev
->sb_events
= mddev
->events
;
2176 if (mddev
->level
== LEVEL_MULTIPATH
)
2177 /* only need to write one superblock... */
2180 md_super_wait(mddev
);
2181 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2183 spin_lock_irq(&mddev
->write_lock
);
2184 if (mddev
->in_sync
!= sync_req
||
2185 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2186 /* have to write it out again */
2187 spin_unlock_irq(&mddev
->write_lock
);
2190 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2191 spin_unlock_irq(&mddev
->write_lock
);
2192 wake_up(&mddev
->sb_wait
);
2193 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2194 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2198 /* words written to sysfs files may, or may not, be \n terminated.
2199 * We want to accept with case. For this we use cmd_match.
2201 static int cmd_match(const char *cmd
, const char *str
)
2203 /* See if cmd, written into a sysfs file, matches
2204 * str. They must either be the same, or cmd can
2205 * have a trailing newline
2207 while (*cmd
&& *str
&& *cmd
== *str
) {
2218 struct rdev_sysfs_entry
{
2219 struct attribute attr
;
2220 ssize_t (*show
)(mdk_rdev_t
*, char *);
2221 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2225 state_show(mdk_rdev_t
*rdev
, char *page
)
2230 if (test_bit(Faulty
, &rdev
->flags
)) {
2231 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2234 if (test_bit(In_sync
, &rdev
->flags
)) {
2235 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2238 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2239 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2242 if (test_bit(Blocked
, &rdev
->flags
)) {
2243 len
+= sprintf(page
+len
, "%sblocked", sep
);
2246 if (!test_bit(Faulty
, &rdev
->flags
) &&
2247 !test_bit(In_sync
, &rdev
->flags
)) {
2248 len
+= sprintf(page
+len
, "%sspare", sep
);
2251 return len
+sprintf(page
+len
, "\n");
2255 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2258 * faulty - simulates and error
2259 * remove - disconnects the device
2260 * writemostly - sets write_mostly
2261 * -writemostly - clears write_mostly
2262 * blocked - sets the Blocked flag
2263 * -blocked - clears the Blocked flag
2264 * insync - sets Insync providing device isn't active
2267 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2268 md_error(rdev
->mddev
, rdev
);
2270 } else if (cmd_match(buf
, "remove")) {
2271 if (rdev
->raid_disk
>= 0)
2274 mddev_t
*mddev
= rdev
->mddev
;
2275 kick_rdev_from_array(rdev
);
2277 md_update_sb(mddev
, 1);
2278 md_new_event(mddev
);
2281 } else if (cmd_match(buf
, "writemostly")) {
2282 set_bit(WriteMostly
, &rdev
->flags
);
2284 } else if (cmd_match(buf
, "-writemostly")) {
2285 clear_bit(WriteMostly
, &rdev
->flags
);
2287 } else if (cmd_match(buf
, "blocked")) {
2288 set_bit(Blocked
, &rdev
->flags
);
2290 } else if (cmd_match(buf
, "-blocked")) {
2291 clear_bit(Blocked
, &rdev
->flags
);
2292 wake_up(&rdev
->blocked_wait
);
2293 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2294 md_wakeup_thread(rdev
->mddev
->thread
);
2297 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2298 set_bit(In_sync
, &rdev
->flags
);
2301 if (!err
&& rdev
->sysfs_state
)
2302 sysfs_notify_dirent(rdev
->sysfs_state
);
2303 return err
? err
: len
;
2305 static struct rdev_sysfs_entry rdev_state
=
2306 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2309 errors_show(mdk_rdev_t
*rdev
, char *page
)
2311 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2315 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2318 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2319 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2320 atomic_set(&rdev
->corrected_errors
, n
);
2325 static struct rdev_sysfs_entry rdev_errors
=
2326 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2329 slot_show(mdk_rdev_t
*rdev
, char *page
)
2331 if (rdev
->raid_disk
< 0)
2332 return sprintf(page
, "none\n");
2334 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2338 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2343 int slot
= simple_strtoul(buf
, &e
, 10);
2344 if (strncmp(buf
, "none", 4)==0)
2346 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2348 if (rdev
->mddev
->pers
&& slot
== -1) {
2349 /* Setting 'slot' on an active array requires also
2350 * updating the 'rd%d' link, and communicating
2351 * with the personality with ->hot_*_disk.
2352 * For now we only support removing
2353 * failed/spare devices. This normally happens automatically,
2354 * but not when the metadata is externally managed.
2356 if (rdev
->raid_disk
== -1)
2358 /* personality does all needed checks */
2359 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2361 err
= rdev
->mddev
->pers
->
2362 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2365 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2366 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2367 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2368 md_wakeup_thread(rdev
->mddev
->thread
);
2369 } else if (rdev
->mddev
->pers
) {
2371 /* Activating a spare .. or possibly reactivating
2372 * if we ever get bitmaps working here.
2375 if (rdev
->raid_disk
!= -1)
2378 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2381 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2382 if (rdev2
->raid_disk
== slot
)
2385 rdev
->raid_disk
= slot
;
2386 if (test_bit(In_sync
, &rdev
->flags
))
2387 rdev
->saved_raid_disk
= slot
;
2389 rdev
->saved_raid_disk
= -1;
2390 err
= rdev
->mddev
->pers
->
2391 hot_add_disk(rdev
->mddev
, rdev
);
2393 rdev
->raid_disk
= -1;
2396 sysfs_notify_dirent(rdev
->sysfs_state
);
2397 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2398 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2400 "md: cannot register "
2402 nm
, mdname(rdev
->mddev
));
2404 /* don't wakeup anyone, leave that to userspace. */
2406 if (slot
>= rdev
->mddev
->raid_disks
)
2408 rdev
->raid_disk
= slot
;
2409 /* assume it is working */
2410 clear_bit(Faulty
, &rdev
->flags
);
2411 clear_bit(WriteMostly
, &rdev
->flags
);
2412 set_bit(In_sync
, &rdev
->flags
);
2413 sysfs_notify_dirent(rdev
->sysfs_state
);
2419 static struct rdev_sysfs_entry rdev_slot
=
2420 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2423 offset_show(mdk_rdev_t
*rdev
, char *page
)
2425 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2429 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2432 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2433 if (e
==buf
|| (*e
&& *e
!= '\n'))
2435 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2437 if (rdev
->sectors
&& rdev
->mddev
->external
)
2438 /* Must set offset before size, so overlap checks
2441 rdev
->data_offset
= offset
;
2445 static struct rdev_sysfs_entry rdev_offset
=
2446 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2449 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2451 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2454 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2456 /* check if two start/length pairs overlap */
2464 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2466 unsigned long long blocks
;
2469 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2472 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2473 return -EINVAL
; /* sector conversion overflow */
2476 if (new != blocks
* 2)
2477 return -EINVAL
; /* unsigned long long to sector_t overflow */
2484 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2486 mddev_t
*my_mddev
= rdev
->mddev
;
2487 sector_t oldsectors
= rdev
->sectors
;
2490 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2492 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2493 if (my_mddev
->persistent
) {
2494 sectors
= super_types
[my_mddev
->major_version
].
2495 rdev_size_change(rdev
, sectors
);
2498 } else if (!sectors
)
2499 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2502 if (sectors
< my_mddev
->dev_sectors
)
2503 return -EINVAL
; /* component must fit device */
2505 rdev
->sectors
= sectors
;
2506 if (sectors
> oldsectors
&& my_mddev
->external
) {
2507 /* need to check that all other rdevs with the same ->bdev
2508 * do not overlap. We need to unlock the mddev to avoid
2509 * a deadlock. We have already changed rdev->sectors, and if
2510 * we have to change it back, we will have the lock again.
2514 struct list_head
*tmp
;
2516 mddev_unlock(my_mddev
);
2517 for_each_mddev(mddev
, tmp
) {
2521 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2522 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2523 (rdev
->bdev
== rdev2
->bdev
&&
2525 overlaps(rdev
->data_offset
, rdev
->sectors
,
2531 mddev_unlock(mddev
);
2537 mddev_lock(my_mddev
);
2539 /* Someone else could have slipped in a size
2540 * change here, but doing so is just silly.
2541 * We put oldsectors back because we *know* it is
2542 * safe, and trust userspace not to race with
2545 rdev
->sectors
= oldsectors
;
2552 static struct rdev_sysfs_entry rdev_size
=
2553 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2555 static struct attribute
*rdev_default_attrs
[] = {
2564 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2566 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2567 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2568 mddev_t
*mddev
= rdev
->mddev
;
2574 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2576 if (rdev
->mddev
== NULL
)
2579 rv
= entry
->show(rdev
, page
);
2580 mddev_unlock(mddev
);
2586 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2587 const char *page
, size_t length
)
2589 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2590 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2592 mddev_t
*mddev
= rdev
->mddev
;
2596 if (!capable(CAP_SYS_ADMIN
))
2598 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2600 if (rdev
->mddev
== NULL
)
2603 rv
= entry
->store(rdev
, page
, length
);
2604 mddev_unlock(mddev
);
2609 static void rdev_free(struct kobject
*ko
)
2611 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2614 static struct sysfs_ops rdev_sysfs_ops
= {
2615 .show
= rdev_attr_show
,
2616 .store
= rdev_attr_store
,
2618 static struct kobj_type rdev_ktype
= {
2619 .release
= rdev_free
,
2620 .sysfs_ops
= &rdev_sysfs_ops
,
2621 .default_attrs
= rdev_default_attrs
,
2625 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2627 * mark the device faulty if:
2629 * - the device is nonexistent (zero size)
2630 * - the device has no valid superblock
2632 * a faulty rdev _never_ has rdev->sb set.
2634 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2636 char b
[BDEVNAME_SIZE
];
2641 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2643 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2644 return ERR_PTR(-ENOMEM
);
2647 if ((err
= alloc_disk_sb(rdev
)))
2650 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2654 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2657 rdev
->saved_raid_disk
= -1;
2658 rdev
->raid_disk
= -1;
2660 rdev
->data_offset
= 0;
2661 rdev
->sb_events
= 0;
2662 rdev
->last_read_error
.tv_sec
= 0;
2663 rdev
->last_read_error
.tv_nsec
= 0;
2664 atomic_set(&rdev
->nr_pending
, 0);
2665 atomic_set(&rdev
->read_errors
, 0);
2666 atomic_set(&rdev
->corrected_errors
, 0);
2668 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2671 "md: %s has zero or unknown size, marking faulty!\n",
2672 bdevname(rdev
->bdev
,b
));
2677 if (super_format
>= 0) {
2678 err
= super_types
[super_format
].
2679 load_super(rdev
, NULL
, super_minor
);
2680 if (err
== -EINVAL
) {
2682 "md: %s does not have a valid v%d.%d "
2683 "superblock, not importing!\n",
2684 bdevname(rdev
->bdev
,b
),
2685 super_format
, super_minor
);
2690 "md: could not read %s's sb, not importing!\n",
2691 bdevname(rdev
->bdev
,b
));
2696 INIT_LIST_HEAD(&rdev
->same_set
);
2697 init_waitqueue_head(&rdev
->blocked_wait
);
2702 if (rdev
->sb_page
) {
2708 return ERR_PTR(err
);
2712 * Check a full RAID array for plausibility
2716 static void analyze_sbs(mddev_t
* mddev
)
2719 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2720 char b
[BDEVNAME_SIZE
];
2723 rdev_for_each(rdev
, tmp
, mddev
)
2724 switch (super_types
[mddev
->major_version
].
2725 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2733 "md: fatal superblock inconsistency in %s"
2734 " -- removing from array\n",
2735 bdevname(rdev
->bdev
,b
));
2736 kick_rdev_from_array(rdev
);
2740 super_types
[mddev
->major_version
].
2741 validate_super(mddev
, freshest
);
2744 rdev_for_each(rdev
, tmp
, mddev
) {
2745 if (rdev
->desc_nr
>= mddev
->max_disks
||
2746 i
> mddev
->max_disks
) {
2748 "md: %s: %s: only %d devices permitted\n",
2749 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2751 kick_rdev_from_array(rdev
);
2754 if (rdev
!= freshest
)
2755 if (super_types
[mddev
->major_version
].
2756 validate_super(mddev
, rdev
)) {
2757 printk(KERN_WARNING
"md: kicking non-fresh %s"
2759 bdevname(rdev
->bdev
,b
));
2760 kick_rdev_from_array(rdev
);
2763 if (mddev
->level
== LEVEL_MULTIPATH
) {
2764 rdev
->desc_nr
= i
++;
2765 rdev
->raid_disk
= rdev
->desc_nr
;
2766 set_bit(In_sync
, &rdev
->flags
);
2767 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2768 rdev
->raid_disk
= -1;
2769 clear_bit(In_sync
, &rdev
->flags
);
2774 /* Read a fixed-point number.
2775 * Numbers in sysfs attributes should be in "standard" units where
2776 * possible, so time should be in seconds.
2777 * However we internally use a a much smaller unit such as
2778 * milliseconds or jiffies.
2779 * This function takes a decimal number with a possible fractional
2780 * component, and produces an integer which is the result of
2781 * multiplying that number by 10^'scale'.
2782 * all without any floating-point arithmetic.
2784 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2786 unsigned long result
= 0;
2788 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2791 else if (decimals
< scale
) {
2794 result
= result
* 10 + value
;
2806 while (decimals
< scale
) {
2815 static void md_safemode_timeout(unsigned long data
);
2818 safe_delay_show(mddev_t
*mddev
, char *page
)
2820 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2821 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2824 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2828 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2831 mddev
->safemode_delay
= 0;
2833 unsigned long old_delay
= mddev
->safemode_delay
;
2834 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2835 if (mddev
->safemode_delay
== 0)
2836 mddev
->safemode_delay
= 1;
2837 if (mddev
->safemode_delay
< old_delay
)
2838 md_safemode_timeout((unsigned long)mddev
);
2842 static struct md_sysfs_entry md_safe_delay
=
2843 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2846 level_show(mddev_t
*mddev
, char *page
)
2848 struct mdk_personality
*p
= mddev
->pers
;
2850 return sprintf(page
, "%s\n", p
->name
);
2851 else if (mddev
->clevel
[0])
2852 return sprintf(page
, "%s\n", mddev
->clevel
);
2853 else if (mddev
->level
!= LEVEL_NONE
)
2854 return sprintf(page
, "%d\n", mddev
->level
);
2860 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2864 struct mdk_personality
*pers
;
2868 if (mddev
->pers
== NULL
) {
2871 if (len
>= sizeof(mddev
->clevel
))
2873 strncpy(mddev
->clevel
, buf
, len
);
2874 if (mddev
->clevel
[len
-1] == '\n')
2876 mddev
->clevel
[len
] = 0;
2877 mddev
->level
= LEVEL_NONE
;
2881 /* request to change the personality. Need to ensure:
2882 * - array is not engaged in resync/recovery/reshape
2883 * - old personality can be suspended
2884 * - new personality will access other array.
2887 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
2890 if (!mddev
->pers
->quiesce
) {
2891 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
2892 mdname(mddev
), mddev
->pers
->name
);
2896 /* Now find the new personality */
2897 if (len
== 0 || len
>= sizeof(level
))
2899 strncpy(level
, buf
, len
);
2900 if (level
[len
-1] == '\n')
2904 request_module("md-%s", level
);
2905 spin_lock(&pers_lock
);
2906 pers
= find_pers(LEVEL_NONE
, level
);
2907 if (!pers
|| !try_module_get(pers
->owner
)) {
2908 spin_unlock(&pers_lock
);
2909 printk(KERN_WARNING
"md: personality %s not loaded\n", level
);
2912 spin_unlock(&pers_lock
);
2914 if (pers
== mddev
->pers
) {
2915 /* Nothing to do! */
2916 module_put(pers
->owner
);
2919 if (!pers
->takeover
) {
2920 module_put(pers
->owner
);
2921 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
2922 mdname(mddev
), level
);
2926 /* ->takeover must set new_* and/or delta_disks
2927 * if it succeeds, and may set them when it fails.
2929 priv
= pers
->takeover(mddev
);
2931 mddev
->new_level
= mddev
->level
;
2932 mddev
->new_layout
= mddev
->layout
;
2933 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
2934 mddev
->raid_disks
-= mddev
->delta_disks
;
2935 mddev
->delta_disks
= 0;
2936 module_put(pers
->owner
);
2937 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
2938 mdname(mddev
), level
);
2939 return PTR_ERR(priv
);
2942 /* Looks like we have a winner */
2943 mddev_suspend(mddev
);
2944 mddev
->pers
->stop(mddev
);
2945 module_put(mddev
->pers
->owner
);
2946 /* Invalidate devices that are now superfluous */
2947 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2948 if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2949 rdev
->raid_disk
= -1;
2950 clear_bit(In_sync
, &rdev
->flags
);
2953 mddev
->private = priv
;
2954 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2955 mddev
->level
= mddev
->new_level
;
2956 mddev
->layout
= mddev
->new_layout
;
2957 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
2958 mddev
->delta_disks
= 0;
2960 mddev_resume(mddev
);
2961 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2962 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2963 md_wakeup_thread(mddev
->thread
);
2967 static struct md_sysfs_entry md_level
=
2968 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2972 layout_show(mddev_t
*mddev
, char *page
)
2974 /* just a number, not meaningful for all levels */
2975 if (mddev
->reshape_position
!= MaxSector
&&
2976 mddev
->layout
!= mddev
->new_layout
)
2977 return sprintf(page
, "%d (%d)\n",
2978 mddev
->new_layout
, mddev
->layout
);
2979 return sprintf(page
, "%d\n", mddev
->layout
);
2983 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2986 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2988 if (!*buf
|| (*e
&& *e
!= '\n'))
2993 if (mddev
->pers
->check_reshape
== NULL
)
2995 mddev
->new_layout
= n
;
2996 err
= mddev
->pers
->check_reshape(mddev
);
2998 mddev
->new_layout
= mddev
->layout
;
3002 mddev
->new_layout
= n
;
3003 if (mddev
->reshape_position
== MaxSector
)
3008 static struct md_sysfs_entry md_layout
=
3009 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3013 raid_disks_show(mddev_t
*mddev
, char *page
)
3015 if (mddev
->raid_disks
== 0)
3017 if (mddev
->reshape_position
!= MaxSector
&&
3018 mddev
->delta_disks
!= 0)
3019 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3020 mddev
->raid_disks
- mddev
->delta_disks
);
3021 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3024 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3027 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3031 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3033 if (!*buf
|| (*e
&& *e
!= '\n'))
3037 rv
= update_raid_disks(mddev
, n
);
3038 else if (mddev
->reshape_position
!= MaxSector
) {
3039 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3040 mddev
->delta_disks
= n
- olddisks
;
3041 mddev
->raid_disks
= n
;
3043 mddev
->raid_disks
= n
;
3044 return rv
? rv
: len
;
3046 static struct md_sysfs_entry md_raid_disks
=
3047 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3050 chunk_size_show(mddev_t
*mddev
, char *page
)
3052 if (mddev
->reshape_position
!= MaxSector
&&
3053 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3054 return sprintf(page
, "%d (%d)\n",
3055 mddev
->new_chunk_sectors
<< 9,
3056 mddev
->chunk_sectors
<< 9);
3057 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3061 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3064 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3066 if (!*buf
|| (*e
&& *e
!= '\n'))
3071 if (mddev
->pers
->check_reshape
== NULL
)
3073 mddev
->new_chunk_sectors
= n
>> 9;
3074 err
= mddev
->pers
->check_reshape(mddev
);
3076 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3080 mddev
->new_chunk_sectors
= n
>> 9;
3081 if (mddev
->reshape_position
== MaxSector
)
3082 mddev
->chunk_sectors
= n
>> 9;
3086 static struct md_sysfs_entry md_chunk_size
=
3087 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3090 resync_start_show(mddev_t
*mddev
, char *page
)
3092 if (mddev
->recovery_cp
== MaxSector
)
3093 return sprintf(page
, "none\n");
3094 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3098 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3101 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3105 if (!*buf
|| (*e
&& *e
!= '\n'))
3108 mddev
->recovery_cp
= n
;
3111 static struct md_sysfs_entry md_resync_start
=
3112 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3115 * The array state can be:
3118 * No devices, no size, no level
3119 * Equivalent to STOP_ARRAY ioctl
3121 * May have some settings, but array is not active
3122 * all IO results in error
3123 * When written, doesn't tear down array, but just stops it
3124 * suspended (not supported yet)
3125 * All IO requests will block. The array can be reconfigured.
3126 * Writing this, if accepted, will block until array is quiescent
3128 * no resync can happen. no superblocks get written.
3129 * write requests fail
3131 * like readonly, but behaves like 'clean' on a write request.
3133 * clean - no pending writes, but otherwise active.
3134 * When written to inactive array, starts without resync
3135 * If a write request arrives then
3136 * if metadata is known, mark 'dirty' and switch to 'active'.
3137 * if not known, block and switch to write-pending
3138 * If written to an active array that has pending writes, then fails.
3140 * fully active: IO and resync can be happening.
3141 * When written to inactive array, starts with resync
3144 * clean, but writes are blocked waiting for 'active' to be written.
3147 * like active, but no writes have been seen for a while (100msec).
3150 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3151 write_pending
, active_idle
, bad_word
};
3152 static char *array_states
[] = {
3153 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3154 "write-pending", "active-idle", NULL
};
3156 static int match_word(const char *word
, char **list
)
3159 for (n
=0; list
[n
]; n
++)
3160 if (cmd_match(word
, list
[n
]))
3166 array_state_show(mddev_t
*mddev
, char *page
)
3168 enum array_state st
= inactive
;
3181 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
3183 else if (mddev
->safemode
)
3189 if (list_empty(&mddev
->disks
) &&
3190 mddev
->raid_disks
== 0 &&
3191 mddev
->dev_sectors
== 0)
3196 return sprintf(page
, "%s\n", array_states
[st
]);
3199 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3200 static int do_md_run(mddev_t
* mddev
);
3201 static int restart_array(mddev_t
*mddev
);
3204 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3207 enum array_state st
= match_word(buf
, array_states
);
3212 /* stopping an active array */
3213 if (atomic_read(&mddev
->openers
) > 0)
3215 err
= do_md_stop(mddev
, 0, 0);
3218 /* stopping an active array */
3220 if (atomic_read(&mddev
->openers
) > 0)
3222 err
= do_md_stop(mddev
, 2, 0);
3224 err
= 0; /* already inactive */
3227 break; /* not supported yet */
3230 err
= do_md_stop(mddev
, 1, 0);
3233 set_disk_ro(mddev
->gendisk
, 1);
3234 err
= do_md_run(mddev
);
3240 err
= do_md_stop(mddev
, 1, 0);
3241 else if (mddev
->ro
== 1)
3242 err
= restart_array(mddev
);
3245 set_disk_ro(mddev
->gendisk
, 0);
3249 err
= do_md_run(mddev
);
3254 restart_array(mddev
);
3255 spin_lock_irq(&mddev
->write_lock
);
3256 if (atomic_read(&mddev
->writes_pending
) == 0) {
3257 if (mddev
->in_sync
== 0) {
3259 if (mddev
->safemode
== 1)
3260 mddev
->safemode
= 0;
3261 if (mddev
->persistent
)
3262 set_bit(MD_CHANGE_CLEAN
,
3268 spin_unlock_irq(&mddev
->write_lock
);
3274 restart_array(mddev
);
3275 if (mddev
->external
)
3276 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3277 wake_up(&mddev
->sb_wait
);
3281 set_disk_ro(mddev
->gendisk
, 0);
3282 err
= do_md_run(mddev
);
3287 /* these cannot be set */
3293 sysfs_notify_dirent(mddev
->sysfs_state
);
3297 static struct md_sysfs_entry md_array_state
=
3298 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3301 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3302 return sprintf(page
, "%d\n",
3303 atomic_read(&mddev
->max_corr_read_errors
));
3307 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3310 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3312 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3313 atomic_set(&mddev
->max_corr_read_errors
, n
);
3319 static struct md_sysfs_entry max_corr_read_errors
=
3320 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3321 max_corrected_read_errors_store
);
3324 null_show(mddev_t
*mddev
, char *page
)
3330 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3332 /* buf must be %d:%d\n? giving major and minor numbers */
3333 /* The new device is added to the array.
3334 * If the array has a persistent superblock, we read the
3335 * superblock to initialise info and check validity.
3336 * Otherwise, only checking done is that in bind_rdev_to_array,
3337 * which mainly checks size.
3340 int major
= simple_strtoul(buf
, &e
, 10);
3346 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3348 minor
= simple_strtoul(e
+1, &e
, 10);
3349 if (*e
&& *e
!= '\n')
3351 dev
= MKDEV(major
, minor
);
3352 if (major
!= MAJOR(dev
) ||
3353 minor
!= MINOR(dev
))
3357 if (mddev
->persistent
) {
3358 rdev
= md_import_device(dev
, mddev
->major_version
,
3359 mddev
->minor_version
);
3360 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3361 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3362 mdk_rdev_t
, same_set
);
3363 err
= super_types
[mddev
->major_version
]
3364 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3368 } else if (mddev
->external
)
3369 rdev
= md_import_device(dev
, -2, -1);
3371 rdev
= md_import_device(dev
, -1, -1);
3374 return PTR_ERR(rdev
);
3375 err
= bind_rdev_to_array(rdev
, mddev
);
3379 return err
? err
: len
;
3382 static struct md_sysfs_entry md_new_device
=
3383 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3386 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3389 unsigned long chunk
, end_chunk
;
3393 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3395 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3396 if (buf
== end
) break;
3397 if (*end
== '-') { /* range */
3399 end_chunk
= simple_strtoul(buf
, &end
, 0);
3400 if (buf
== end
) break;
3402 if (*end
&& !isspace(*end
)) break;
3403 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3405 while (isspace(*buf
)) buf
++;
3407 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3412 static struct md_sysfs_entry md_bitmap
=
3413 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3416 size_show(mddev_t
*mddev
, char *page
)
3418 return sprintf(page
, "%llu\n",
3419 (unsigned long long)mddev
->dev_sectors
/ 2);
3422 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3425 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3427 /* If array is inactive, we can reduce the component size, but
3428 * not increase it (except from 0).
3429 * If array is active, we can try an on-line resize
3432 int err
= strict_blocks_to_sectors(buf
, §ors
);
3437 err
= update_size(mddev
, sectors
);
3438 md_update_sb(mddev
, 1);
3440 if (mddev
->dev_sectors
== 0 ||
3441 mddev
->dev_sectors
> sectors
)
3442 mddev
->dev_sectors
= sectors
;
3446 return err
? err
: len
;
3449 static struct md_sysfs_entry md_size
=
3450 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3455 * 'none' for arrays with no metadata (good luck...)
3456 * 'external' for arrays with externally managed metadata,
3457 * or N.M for internally known formats
3460 metadata_show(mddev_t
*mddev
, char *page
)
3462 if (mddev
->persistent
)
3463 return sprintf(page
, "%d.%d\n",
3464 mddev
->major_version
, mddev
->minor_version
);
3465 else if (mddev
->external
)
3466 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3468 return sprintf(page
, "none\n");
3472 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3476 /* Changing the details of 'external' metadata is
3477 * always permitted. Otherwise there must be
3478 * no devices attached to the array.
3480 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3482 else if (!list_empty(&mddev
->disks
))
3485 if (cmd_match(buf
, "none")) {
3486 mddev
->persistent
= 0;
3487 mddev
->external
= 0;
3488 mddev
->major_version
= 0;
3489 mddev
->minor_version
= 90;
3492 if (strncmp(buf
, "external:", 9) == 0) {
3493 size_t namelen
= len
-9;
3494 if (namelen
>= sizeof(mddev
->metadata_type
))
3495 namelen
= sizeof(mddev
->metadata_type
)-1;
3496 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3497 mddev
->metadata_type
[namelen
] = 0;
3498 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3499 mddev
->metadata_type
[--namelen
] = 0;
3500 mddev
->persistent
= 0;
3501 mddev
->external
= 1;
3502 mddev
->major_version
= 0;
3503 mddev
->minor_version
= 90;
3506 major
= simple_strtoul(buf
, &e
, 10);
3507 if (e
==buf
|| *e
!= '.')
3510 minor
= simple_strtoul(buf
, &e
, 10);
3511 if (e
==buf
|| (*e
&& *e
!= '\n') )
3513 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3515 mddev
->major_version
= major
;
3516 mddev
->minor_version
= minor
;
3517 mddev
->persistent
= 1;
3518 mddev
->external
= 0;
3522 static struct md_sysfs_entry md_metadata
=
3523 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3526 action_show(mddev_t
*mddev
, char *page
)
3528 char *type
= "idle";
3529 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3531 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3532 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3533 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3535 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3536 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3538 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3542 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3545 return sprintf(page
, "%s\n", type
);
3549 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3551 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3554 if (cmd_match(page
, "frozen"))
3555 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3557 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3559 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3560 if (mddev
->sync_thread
) {
3561 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3562 md_unregister_thread(mddev
->sync_thread
);
3563 mddev
->sync_thread
= NULL
;
3564 mddev
->recovery
= 0;
3566 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3567 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3569 else if (cmd_match(page
, "resync"))
3570 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3571 else if (cmd_match(page
, "recover")) {
3572 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3573 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3574 } else if (cmd_match(page
, "reshape")) {
3576 if (mddev
->pers
->start_reshape
== NULL
)
3578 err
= mddev
->pers
->start_reshape(mddev
);
3581 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3583 if (cmd_match(page
, "check"))
3584 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3585 else if (!cmd_match(page
, "repair"))
3587 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3588 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3590 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3591 md_wakeup_thread(mddev
->thread
);
3592 sysfs_notify_dirent(mddev
->sysfs_action
);
3597 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3599 return sprintf(page
, "%llu\n",
3600 (unsigned long long) mddev
->resync_mismatches
);
3603 static struct md_sysfs_entry md_scan_mode
=
3604 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3607 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3610 sync_min_show(mddev_t
*mddev
, char *page
)
3612 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3613 mddev
->sync_speed_min
? "local": "system");
3617 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3621 if (strncmp(buf
, "system", 6)==0) {
3622 mddev
->sync_speed_min
= 0;
3625 min
= simple_strtoul(buf
, &e
, 10);
3626 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3628 mddev
->sync_speed_min
= min
;
3632 static struct md_sysfs_entry md_sync_min
=
3633 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3636 sync_max_show(mddev_t
*mddev
, char *page
)
3638 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3639 mddev
->sync_speed_max
? "local": "system");
3643 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3647 if (strncmp(buf
, "system", 6)==0) {
3648 mddev
->sync_speed_max
= 0;
3651 max
= simple_strtoul(buf
, &e
, 10);
3652 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3654 mddev
->sync_speed_max
= max
;
3658 static struct md_sysfs_entry md_sync_max
=
3659 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3662 degraded_show(mddev_t
*mddev
, char *page
)
3664 return sprintf(page
, "%d\n", mddev
->degraded
);
3666 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3669 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3671 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3675 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3679 if (strict_strtol(buf
, 10, &n
))
3682 if (n
!= 0 && n
!= 1)
3685 mddev
->parallel_resync
= n
;
3687 if (mddev
->sync_thread
)
3688 wake_up(&resync_wait
);
3693 /* force parallel resync, even with shared block devices */
3694 static struct md_sysfs_entry md_sync_force_parallel
=
3695 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3696 sync_force_parallel_show
, sync_force_parallel_store
);
3699 sync_speed_show(mddev_t
*mddev
, char *page
)
3701 unsigned long resync
, dt
, db
;
3702 if (mddev
->curr_resync
== 0)
3703 return sprintf(page
, "none\n");
3704 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3705 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3707 db
= resync
- mddev
->resync_mark_cnt
;
3708 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3711 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3714 sync_completed_show(mddev_t
*mddev
, char *page
)
3716 unsigned long max_sectors
, resync
;
3718 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3719 return sprintf(page
, "none\n");
3721 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3722 max_sectors
= mddev
->resync_max_sectors
;
3724 max_sectors
= mddev
->dev_sectors
;
3726 resync
= mddev
->curr_resync_completed
;
3727 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3730 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3733 min_sync_show(mddev_t
*mddev
, char *page
)
3735 return sprintf(page
, "%llu\n",
3736 (unsigned long long)mddev
->resync_min
);
3739 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3741 unsigned long long min
;
3742 if (strict_strtoull(buf
, 10, &min
))
3744 if (min
> mddev
->resync_max
)
3746 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3749 /* Must be a multiple of chunk_size */
3750 if (mddev
->chunk_sectors
) {
3751 sector_t temp
= min
;
3752 if (sector_div(temp
, mddev
->chunk_sectors
))
3755 mddev
->resync_min
= min
;
3760 static struct md_sysfs_entry md_min_sync
=
3761 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3764 max_sync_show(mddev_t
*mddev
, char *page
)
3766 if (mddev
->resync_max
== MaxSector
)
3767 return sprintf(page
, "max\n");
3769 return sprintf(page
, "%llu\n",
3770 (unsigned long long)mddev
->resync_max
);
3773 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3775 if (strncmp(buf
, "max", 3) == 0)
3776 mddev
->resync_max
= MaxSector
;
3778 unsigned long long max
;
3779 if (strict_strtoull(buf
, 10, &max
))
3781 if (max
< mddev
->resync_min
)
3783 if (max
< mddev
->resync_max
&&
3785 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3788 /* Must be a multiple of chunk_size */
3789 if (mddev
->chunk_sectors
) {
3790 sector_t temp
= max
;
3791 if (sector_div(temp
, mddev
->chunk_sectors
))
3794 mddev
->resync_max
= max
;
3796 wake_up(&mddev
->recovery_wait
);
3800 static struct md_sysfs_entry md_max_sync
=
3801 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3804 suspend_lo_show(mddev_t
*mddev
, char *page
)
3806 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3810 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3813 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3815 if (mddev
->pers
== NULL
||
3816 mddev
->pers
->quiesce
== NULL
)
3818 if (buf
== e
|| (*e
&& *e
!= '\n'))
3820 if (new >= mddev
->suspend_hi
||
3821 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3822 mddev
->suspend_lo
= new;
3823 mddev
->pers
->quiesce(mddev
, 2);
3828 static struct md_sysfs_entry md_suspend_lo
=
3829 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3833 suspend_hi_show(mddev_t
*mddev
, char *page
)
3835 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3839 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3842 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3844 if (mddev
->pers
== NULL
||
3845 mddev
->pers
->quiesce
== NULL
)
3847 if (buf
== e
|| (*e
&& *e
!= '\n'))
3849 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3850 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3851 mddev
->suspend_hi
= new;
3852 mddev
->pers
->quiesce(mddev
, 1);
3853 mddev
->pers
->quiesce(mddev
, 0);
3858 static struct md_sysfs_entry md_suspend_hi
=
3859 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3862 reshape_position_show(mddev_t
*mddev
, char *page
)
3864 if (mddev
->reshape_position
!= MaxSector
)
3865 return sprintf(page
, "%llu\n",
3866 (unsigned long long)mddev
->reshape_position
);
3867 strcpy(page
, "none\n");
3872 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3875 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3878 if (buf
== e
|| (*e
&& *e
!= '\n'))
3880 mddev
->reshape_position
= new;
3881 mddev
->delta_disks
= 0;
3882 mddev
->new_level
= mddev
->level
;
3883 mddev
->new_layout
= mddev
->layout
;
3884 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3888 static struct md_sysfs_entry md_reshape_position
=
3889 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3890 reshape_position_store
);
3893 array_size_show(mddev_t
*mddev
, char *page
)
3895 if (mddev
->external_size
)
3896 return sprintf(page
, "%llu\n",
3897 (unsigned long long)mddev
->array_sectors
/2);
3899 return sprintf(page
, "default\n");
3903 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3907 if (strncmp(buf
, "default", 7) == 0) {
3909 sectors
= mddev
->pers
->size(mddev
, 0, 0);
3911 sectors
= mddev
->array_sectors
;
3913 mddev
->external_size
= 0;
3915 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3917 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
3920 mddev
->external_size
= 1;
3923 mddev
->array_sectors
= sectors
;
3924 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
3926 revalidate_disk(mddev
->gendisk
);
3931 static struct md_sysfs_entry md_array_size
=
3932 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
3935 static struct attribute
*md_default_attrs
[] = {
3938 &md_raid_disks
.attr
,
3939 &md_chunk_size
.attr
,
3941 &md_resync_start
.attr
,
3943 &md_new_device
.attr
,
3944 &md_safe_delay
.attr
,
3945 &md_array_state
.attr
,
3946 &md_reshape_position
.attr
,
3947 &md_array_size
.attr
,
3948 &max_corr_read_errors
.attr
,
3952 static struct attribute
*md_redundancy_attrs
[] = {
3954 &md_mismatches
.attr
,
3957 &md_sync_speed
.attr
,
3958 &md_sync_force_parallel
.attr
,
3959 &md_sync_completed
.attr
,
3962 &md_suspend_lo
.attr
,
3963 &md_suspend_hi
.attr
,
3968 static struct attribute_group md_redundancy_group
= {
3970 .attrs
= md_redundancy_attrs
,
3975 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3977 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3978 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3983 rv
= mddev_lock(mddev
);
3985 rv
= entry
->show(mddev
, page
);
3986 mddev_unlock(mddev
);
3992 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3993 const char *page
, size_t length
)
3995 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3996 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4001 if (!capable(CAP_SYS_ADMIN
))
4003 rv
= mddev_lock(mddev
);
4004 if (mddev
->hold_active
== UNTIL_IOCTL
)
4005 mddev
->hold_active
= 0;
4007 rv
= entry
->store(mddev
, page
, length
);
4008 mddev_unlock(mddev
);
4013 static void md_free(struct kobject
*ko
)
4015 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4017 if (mddev
->sysfs_state
)
4018 sysfs_put(mddev
->sysfs_state
);
4020 if (mddev
->gendisk
) {
4021 del_gendisk(mddev
->gendisk
);
4022 put_disk(mddev
->gendisk
);
4025 blk_cleanup_queue(mddev
->queue
);
4030 static struct sysfs_ops md_sysfs_ops
= {
4031 .show
= md_attr_show
,
4032 .store
= md_attr_store
,
4034 static struct kobj_type md_ktype
= {
4036 .sysfs_ops
= &md_sysfs_ops
,
4037 .default_attrs
= md_default_attrs
,
4042 static void mddev_delayed_delete(struct work_struct
*ws
)
4044 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4046 if (mddev
->private == &md_redundancy_group
) {
4047 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
4048 if (mddev
->sysfs_action
)
4049 sysfs_put(mddev
->sysfs_action
);
4050 mddev
->sysfs_action
= NULL
;
4051 mddev
->private = NULL
;
4053 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4054 kobject_del(&mddev
->kobj
);
4055 kobject_put(&mddev
->kobj
);
4058 static int md_alloc(dev_t dev
, char *name
)
4060 static DEFINE_MUTEX(disks_mutex
);
4061 mddev_t
*mddev
= mddev_find(dev
);
4062 struct gendisk
*disk
;
4071 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4072 shift
= partitioned
? MdpMinorShift
: 0;
4073 unit
= MINOR(mddev
->unit
) >> shift
;
4075 /* wait for any previous instance if this device
4076 * to be completed removed (mddev_delayed_delete).
4078 flush_scheduled_work();
4080 mutex_lock(&disks_mutex
);
4086 /* Need to ensure that 'name' is not a duplicate.
4089 spin_lock(&all_mddevs_lock
);
4091 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4092 if (mddev2
->gendisk
&&
4093 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4094 spin_unlock(&all_mddevs_lock
);
4097 spin_unlock(&all_mddevs_lock
);
4101 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4104 mddev
->queue
->queuedata
= mddev
;
4106 /* Can be unlocked because the queue is new: no concurrency */
4107 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
4109 blk_queue_make_request(mddev
->queue
, md_make_request
);
4111 disk
= alloc_disk(1 << shift
);
4113 blk_cleanup_queue(mddev
->queue
);
4114 mddev
->queue
= NULL
;
4117 disk
->major
= MAJOR(mddev
->unit
);
4118 disk
->first_minor
= unit
<< shift
;
4120 strcpy(disk
->disk_name
, name
);
4121 else if (partitioned
)
4122 sprintf(disk
->disk_name
, "md_d%d", unit
);
4124 sprintf(disk
->disk_name
, "md%d", unit
);
4125 disk
->fops
= &md_fops
;
4126 disk
->private_data
= mddev
;
4127 disk
->queue
= mddev
->queue
;
4128 /* Allow extended partitions. This makes the
4129 * 'mdp' device redundant, but we can't really
4132 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4134 mddev
->gendisk
= disk
;
4135 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4136 &disk_to_dev(disk
)->kobj
, "%s", "md");
4138 /* This isn't possible, but as kobject_init_and_add is marked
4139 * __must_check, we must do something with the result
4141 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4145 if (sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4146 printk(KERN_DEBUG
"pointless warning\n");
4148 mutex_unlock(&disks_mutex
);
4150 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4151 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
4157 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4159 md_alloc(dev
, NULL
);
4163 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4165 /* val must be "md_*" where * is not all digits.
4166 * We allocate an array with a large free minor number, and
4167 * set the name to val. val must not already be an active name.
4169 int len
= strlen(val
);
4170 char buf
[DISK_NAME_LEN
];
4172 while (len
&& val
[len
-1] == '\n')
4174 if (len
>= DISK_NAME_LEN
)
4176 strlcpy(buf
, val
, len
+1);
4177 if (strncmp(buf
, "md_", 3) != 0)
4179 return md_alloc(0, buf
);
4182 static void md_safemode_timeout(unsigned long data
)
4184 mddev_t
*mddev
= (mddev_t
*) data
;
4186 if (!atomic_read(&mddev
->writes_pending
)) {
4187 mddev
->safemode
= 1;
4188 if (mddev
->external
)
4189 sysfs_notify_dirent(mddev
->sysfs_state
);
4191 md_wakeup_thread(mddev
->thread
);
4194 static int start_dirty_degraded
;
4196 static int do_md_run(mddev_t
* mddev
)
4200 struct gendisk
*disk
;
4201 struct mdk_personality
*pers
;
4203 if (list_empty(&mddev
->disks
))
4204 /* cannot run an array with no devices.. */
4211 * Analyze all RAID superblock(s)
4213 if (!mddev
->raid_disks
) {
4214 if (!mddev
->persistent
)
4219 if (mddev
->level
!= LEVEL_NONE
)
4220 request_module("md-level-%d", mddev
->level
);
4221 else if (mddev
->clevel
[0])
4222 request_module("md-%s", mddev
->clevel
);
4225 * Drop all container device buffers, from now on
4226 * the only valid external interface is through the md
4229 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4230 if (test_bit(Faulty
, &rdev
->flags
))
4232 sync_blockdev(rdev
->bdev
);
4233 invalidate_bdev(rdev
->bdev
);
4235 /* perform some consistency tests on the device.
4236 * We don't want the data to overlap the metadata,
4237 * Internal Bitmap issues have been handled elsewhere.
4239 if (rdev
->data_offset
< rdev
->sb_start
) {
4240 if (mddev
->dev_sectors
&&
4241 rdev
->data_offset
+ mddev
->dev_sectors
4243 printk("md: %s: data overlaps metadata\n",
4248 if (rdev
->sb_start
+ rdev
->sb_size
/512
4249 > rdev
->data_offset
) {
4250 printk("md: %s: metadata overlaps data\n",
4255 sysfs_notify_dirent(rdev
->sysfs_state
);
4258 md_probe(mddev
->unit
, NULL
, NULL
);
4259 disk
= mddev
->gendisk
;
4263 spin_lock(&pers_lock
);
4264 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4265 if (!pers
|| !try_module_get(pers
->owner
)) {
4266 spin_unlock(&pers_lock
);
4267 if (mddev
->level
!= LEVEL_NONE
)
4268 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4271 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4276 spin_unlock(&pers_lock
);
4277 if (mddev
->level
!= pers
->level
) {
4278 mddev
->level
= pers
->level
;
4279 mddev
->new_level
= pers
->level
;
4281 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4283 if (mddev
->reshape_position
!= MaxSector
&&
4284 pers
->start_reshape
== NULL
) {
4285 /* This personality cannot handle reshaping... */
4287 module_put(pers
->owner
);
4291 if (pers
->sync_request
) {
4292 /* Warn if this is a potentially silly
4295 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4299 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4300 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4302 rdev
->bdev
->bd_contains
==
4303 rdev2
->bdev
->bd_contains
) {
4305 "%s: WARNING: %s appears to be"
4306 " on the same physical disk as"
4309 bdevname(rdev
->bdev
,b
),
4310 bdevname(rdev2
->bdev
,b2
));
4317 "True protection against single-disk"
4318 " failure might be compromised.\n");
4321 mddev
->recovery
= 0;
4322 /* may be over-ridden by personality */
4323 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4325 mddev
->barriers_work
= 1;
4326 mddev
->ok_start_degraded
= start_dirty_degraded
;
4329 mddev
->ro
= 2; /* read-only, but switch on first write */
4331 err
= mddev
->pers
->run(mddev
);
4333 printk(KERN_ERR
"md: pers->run() failed ...\n");
4334 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4335 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4336 " but 'external_size' not in effect?\n", __func__
);
4338 "md: invalid array_size %llu > default size %llu\n",
4339 (unsigned long long)mddev
->array_sectors
/ 2,
4340 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4342 mddev
->pers
->stop(mddev
);
4344 if (err
== 0 && mddev
->pers
->sync_request
) {
4345 err
= bitmap_create(mddev
);
4347 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4348 mdname(mddev
), err
);
4349 mddev
->pers
->stop(mddev
);
4353 module_put(mddev
->pers
->owner
);
4355 bitmap_destroy(mddev
);
4358 if (mddev
->pers
->sync_request
) {
4359 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4361 "md: cannot register extra attributes for %s\n",
4363 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4364 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4367 atomic_set(&mddev
->writes_pending
,0);
4368 atomic_set(&mddev
->max_corr_read_errors
,
4369 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4370 mddev
->safemode
= 0;
4371 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4372 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4373 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4376 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4377 if (rdev
->raid_disk
>= 0) {
4379 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4380 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4381 printk("md: cannot register %s for %s\n",
4385 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4388 md_update_sb(mddev
, 0);
4390 set_capacity(disk
, mddev
->array_sectors
);
4392 /* If there is a partially-recovered drive we need to
4393 * start recovery here. If we leave it to md_check_recovery,
4394 * it will remove the drives and not do the right thing
4396 if (mddev
->degraded
&& !mddev
->sync_thread
) {
4398 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4399 if (rdev
->raid_disk
>= 0 &&
4400 !test_bit(In_sync
, &rdev
->flags
) &&
4401 !test_bit(Faulty
, &rdev
->flags
))
4402 /* complete an interrupted recovery */
4404 if (spares
&& mddev
->pers
->sync_request
) {
4405 mddev
->recovery
= 0;
4406 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4407 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4410 if (!mddev
->sync_thread
) {
4411 printk(KERN_ERR
"%s: could not start resync"
4414 /* leave the spares where they are, it shouldn't hurt */
4415 mddev
->recovery
= 0;
4419 md_wakeup_thread(mddev
->thread
);
4420 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4422 revalidate_disk(mddev
->gendisk
);
4424 md_new_event(mddev
);
4425 sysfs_notify_dirent(mddev
->sysfs_state
);
4426 if (mddev
->sysfs_action
)
4427 sysfs_notify_dirent(mddev
->sysfs_action
);
4428 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4429 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4433 static int restart_array(mddev_t
*mddev
)
4435 struct gendisk
*disk
= mddev
->gendisk
;
4437 /* Complain if it has no devices */
4438 if (list_empty(&mddev
->disks
))
4444 mddev
->safemode
= 0;
4446 set_disk_ro(disk
, 0);
4447 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4449 /* Kick recovery or resync if necessary */
4450 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4451 md_wakeup_thread(mddev
->thread
);
4452 md_wakeup_thread(mddev
->sync_thread
);
4453 sysfs_notify_dirent(mddev
->sysfs_state
);
4457 /* similar to deny_write_access, but accounts for our holding a reference
4458 * to the file ourselves */
4459 static int deny_bitmap_write_access(struct file
* file
)
4461 struct inode
*inode
= file
->f_mapping
->host
;
4463 spin_lock(&inode
->i_lock
);
4464 if (atomic_read(&inode
->i_writecount
) > 1) {
4465 spin_unlock(&inode
->i_lock
);
4468 atomic_set(&inode
->i_writecount
, -1);
4469 spin_unlock(&inode
->i_lock
);
4474 void restore_bitmap_write_access(struct file
*file
)
4476 struct inode
*inode
= file
->f_mapping
->host
;
4478 spin_lock(&inode
->i_lock
);
4479 atomic_set(&inode
->i_writecount
, 1);
4480 spin_unlock(&inode
->i_lock
);
4484 * 0 - completely stop and dis-assemble array
4485 * 1 - switch to readonly
4486 * 2 - stop but do not disassemble array
4488 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4491 struct gendisk
*disk
= mddev
->gendisk
;
4494 mutex_lock(&mddev
->open_mutex
);
4495 if (atomic_read(&mddev
->openers
) > is_open
) {
4496 printk("md: %s still in use.\n",mdname(mddev
));
4498 } else if (mddev
->pers
) {
4500 if (mddev
->sync_thread
) {
4501 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4502 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4503 md_unregister_thread(mddev
->sync_thread
);
4504 mddev
->sync_thread
= NULL
;
4507 del_timer_sync(&mddev
->safemode_timer
);
4510 case 1: /* readonly */
4516 case 0: /* disassemble */
4518 bitmap_flush(mddev
);
4519 md_super_wait(mddev
);
4521 set_disk_ro(disk
, 0);
4523 mddev
->pers
->stop(mddev
);
4524 mddev
->queue
->merge_bvec_fn
= NULL
;
4525 mddev
->queue
->unplug_fn
= NULL
;
4526 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4527 module_put(mddev
->pers
->owner
);
4528 if (mddev
->pers
->sync_request
)
4529 mddev
->private = &md_redundancy_group
;
4531 /* tell userspace to handle 'inactive' */
4532 sysfs_notify_dirent(mddev
->sysfs_state
);
4534 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4535 if (rdev
->raid_disk
>= 0) {
4537 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4538 sysfs_remove_link(&mddev
->kobj
, nm
);
4541 set_capacity(disk
, 0);
4547 if (!mddev
->in_sync
|| mddev
->flags
) {
4548 /* mark array as shutdown cleanly */
4550 md_update_sb(mddev
, 1);
4553 set_disk_ro(disk
, 1);
4554 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4558 mutex_unlock(&mddev
->open_mutex
);
4562 * Free resources if final stop
4566 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4568 bitmap_destroy(mddev
);
4569 if (mddev
->bitmap_info
.file
) {
4570 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4571 fput(mddev
->bitmap_info
.file
);
4572 mddev
->bitmap_info
.file
= NULL
;
4574 mddev
->bitmap_info
.offset
= 0;
4576 /* make sure all md_delayed_delete calls have finished */
4577 flush_scheduled_work();
4579 export_array(mddev
);
4581 mddev
->array_sectors
= 0;
4582 mddev
->external_size
= 0;
4583 mddev
->dev_sectors
= 0;
4584 mddev
->raid_disks
= 0;
4585 mddev
->recovery_cp
= 0;
4586 mddev
->resync_min
= 0;
4587 mddev
->resync_max
= MaxSector
;
4588 mddev
->reshape_position
= MaxSector
;
4589 mddev
->external
= 0;
4590 mddev
->persistent
= 0;
4591 mddev
->level
= LEVEL_NONE
;
4592 mddev
->clevel
[0] = 0;
4595 mddev
->metadata_type
[0] = 0;
4596 mddev
->chunk_sectors
= 0;
4597 mddev
->ctime
= mddev
->utime
= 0;
4599 mddev
->max_disks
= 0;
4601 mddev
->delta_disks
= 0;
4602 mddev
->new_level
= LEVEL_NONE
;
4603 mddev
->new_layout
= 0;
4604 mddev
->new_chunk_sectors
= 0;
4605 mddev
->curr_resync
= 0;
4606 mddev
->resync_mismatches
= 0;
4607 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4608 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4609 mddev
->recovery
= 0;
4612 mddev
->degraded
= 0;
4613 mddev
->barriers_work
= 0;
4614 mddev
->safemode
= 0;
4615 mddev
->bitmap_info
.offset
= 0;
4616 mddev
->bitmap_info
.default_offset
= 0;
4617 mddev
->bitmap_info
.chunksize
= 0;
4618 mddev
->bitmap_info
.daemon_sleep
= 0;
4619 mddev
->bitmap_info
.max_write_behind
= 0;
4620 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4621 if (mddev
->hold_active
== UNTIL_STOP
)
4622 mddev
->hold_active
= 0;
4624 } else if (mddev
->pers
)
4625 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
4628 blk_integrity_unregister(disk
);
4629 md_new_event(mddev
);
4630 sysfs_notify_dirent(mddev
->sysfs_state
);
4635 static void autorun_array(mddev_t
*mddev
)
4640 if (list_empty(&mddev
->disks
))
4643 printk(KERN_INFO
"md: running: ");
4645 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4646 char b
[BDEVNAME_SIZE
];
4647 printk("<%s>", bdevname(rdev
->bdev
,b
));
4651 err
= do_md_run(mddev
);
4653 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4654 do_md_stop(mddev
, 0, 0);
4659 * lets try to run arrays based on all disks that have arrived
4660 * until now. (those are in pending_raid_disks)
4662 * the method: pick the first pending disk, collect all disks with
4663 * the same UUID, remove all from the pending list and put them into
4664 * the 'same_array' list. Then order this list based on superblock
4665 * update time (freshest comes first), kick out 'old' disks and
4666 * compare superblocks. If everything's fine then run it.
4668 * If "unit" is allocated, then bump its reference count
4670 static void autorun_devices(int part
)
4672 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4674 char b
[BDEVNAME_SIZE
];
4676 printk(KERN_INFO
"md: autorun ...\n");
4677 while (!list_empty(&pending_raid_disks
)) {
4680 LIST_HEAD(candidates
);
4681 rdev0
= list_entry(pending_raid_disks
.next
,
4682 mdk_rdev_t
, same_set
);
4684 printk(KERN_INFO
"md: considering %s ...\n",
4685 bdevname(rdev0
->bdev
,b
));
4686 INIT_LIST_HEAD(&candidates
);
4687 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4688 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4689 printk(KERN_INFO
"md: adding %s ...\n",
4690 bdevname(rdev
->bdev
,b
));
4691 list_move(&rdev
->same_set
, &candidates
);
4694 * now we have a set of devices, with all of them having
4695 * mostly sane superblocks. It's time to allocate the
4699 dev
= MKDEV(mdp_major
,
4700 rdev0
->preferred_minor
<< MdpMinorShift
);
4701 unit
= MINOR(dev
) >> MdpMinorShift
;
4703 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4706 if (rdev0
->preferred_minor
!= unit
) {
4707 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4708 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4712 md_probe(dev
, NULL
, NULL
);
4713 mddev
= mddev_find(dev
);
4714 if (!mddev
|| !mddev
->gendisk
) {
4718 "md: cannot allocate memory for md drive.\n");
4721 if (mddev_lock(mddev
))
4722 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4724 else if (mddev
->raid_disks
|| mddev
->major_version
4725 || !list_empty(&mddev
->disks
)) {
4727 "md: %s already running, cannot run %s\n",
4728 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4729 mddev_unlock(mddev
);
4731 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4732 mddev
->persistent
= 1;
4733 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4734 list_del_init(&rdev
->same_set
);
4735 if (bind_rdev_to_array(rdev
, mddev
))
4738 autorun_array(mddev
);
4739 mddev_unlock(mddev
);
4741 /* on success, candidates will be empty, on error
4744 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4745 list_del_init(&rdev
->same_set
);
4750 printk(KERN_INFO
"md: ... autorun DONE.\n");
4752 #endif /* !MODULE */
4754 static int get_version(void __user
* arg
)
4758 ver
.major
= MD_MAJOR_VERSION
;
4759 ver
.minor
= MD_MINOR_VERSION
;
4760 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4762 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4768 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4770 mdu_array_info_t info
;
4771 int nr
,working
,insync
,failed
,spare
;
4774 nr
=working
=insync
=failed
=spare
=0;
4775 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4777 if (test_bit(Faulty
, &rdev
->flags
))
4781 if (test_bit(In_sync
, &rdev
->flags
))
4788 info
.major_version
= mddev
->major_version
;
4789 info
.minor_version
= mddev
->minor_version
;
4790 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4791 info
.ctime
= mddev
->ctime
;
4792 info
.level
= mddev
->level
;
4793 info
.size
= mddev
->dev_sectors
/ 2;
4794 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4797 info
.raid_disks
= mddev
->raid_disks
;
4798 info
.md_minor
= mddev
->md_minor
;
4799 info
.not_persistent
= !mddev
->persistent
;
4801 info
.utime
= mddev
->utime
;
4804 info
.state
= (1<<MD_SB_CLEAN
);
4805 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
4806 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4807 info
.active_disks
= insync
;
4808 info
.working_disks
= working
;
4809 info
.failed_disks
= failed
;
4810 info
.spare_disks
= spare
;
4812 info
.layout
= mddev
->layout
;
4813 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
4815 if (copy_to_user(arg
, &info
, sizeof(info
)))
4821 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4823 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4824 char *ptr
, *buf
= NULL
;
4827 if (md_allow_write(mddev
))
4828 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4830 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4835 /* bitmap disabled, zero the first byte and copy out */
4836 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4837 file
->pathname
[0] = '\0';
4841 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4845 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4849 strcpy(file
->pathname
, ptr
);
4853 if (copy_to_user(arg
, file
, sizeof(*file
)))
4861 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4863 mdu_disk_info_t info
;
4866 if (copy_from_user(&info
, arg
, sizeof(info
)))
4869 rdev
= find_rdev_nr(mddev
, info
.number
);
4871 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4872 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4873 info
.raid_disk
= rdev
->raid_disk
;
4875 if (test_bit(Faulty
, &rdev
->flags
))
4876 info
.state
|= (1<<MD_DISK_FAULTY
);
4877 else if (test_bit(In_sync
, &rdev
->flags
)) {
4878 info
.state
|= (1<<MD_DISK_ACTIVE
);
4879 info
.state
|= (1<<MD_DISK_SYNC
);
4881 if (test_bit(WriteMostly
, &rdev
->flags
))
4882 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4884 info
.major
= info
.minor
= 0;
4885 info
.raid_disk
= -1;
4886 info
.state
= (1<<MD_DISK_REMOVED
);
4889 if (copy_to_user(arg
, &info
, sizeof(info
)))
4895 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4897 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4899 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4901 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4904 if (!mddev
->raid_disks
) {
4906 /* expecting a device which has a superblock */
4907 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4910 "md: md_import_device returned %ld\n",
4912 return PTR_ERR(rdev
);
4914 if (!list_empty(&mddev
->disks
)) {
4915 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4916 mdk_rdev_t
, same_set
);
4917 err
= super_types
[mddev
->major_version
]
4918 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4921 "md: %s has different UUID to %s\n",
4922 bdevname(rdev
->bdev
,b
),
4923 bdevname(rdev0
->bdev
,b2
));
4928 err
= bind_rdev_to_array(rdev
, mddev
);
4935 * add_new_disk can be used once the array is assembled
4936 * to add "hot spares". They must already have a superblock
4941 if (!mddev
->pers
->hot_add_disk
) {
4943 "%s: personality does not support diskops!\n",
4947 if (mddev
->persistent
)
4948 rdev
= md_import_device(dev
, mddev
->major_version
,
4949 mddev
->minor_version
);
4951 rdev
= md_import_device(dev
, -1, -1);
4954 "md: md_import_device returned %ld\n",
4956 return PTR_ERR(rdev
);
4958 /* set save_raid_disk if appropriate */
4959 if (!mddev
->persistent
) {
4960 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4961 info
->raid_disk
< mddev
->raid_disks
)
4962 rdev
->raid_disk
= info
->raid_disk
;
4964 rdev
->raid_disk
= -1;
4966 super_types
[mddev
->major_version
].
4967 validate_super(mddev
, rdev
);
4968 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4970 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4971 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4972 set_bit(WriteMostly
, &rdev
->flags
);
4974 clear_bit(WriteMostly
, &rdev
->flags
);
4976 rdev
->raid_disk
= -1;
4977 err
= bind_rdev_to_array(rdev
, mddev
);
4978 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4979 /* If there is hot_add_disk but no hot_remove_disk
4980 * then added disks for geometry changes,
4981 * and should be added immediately.
4983 super_types
[mddev
->major_version
].
4984 validate_super(mddev
, rdev
);
4985 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4987 unbind_rdev_from_array(rdev
);
4992 sysfs_notify_dirent(rdev
->sysfs_state
);
4994 md_update_sb(mddev
, 1);
4995 if (mddev
->degraded
)
4996 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4997 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4998 md_wakeup_thread(mddev
->thread
);
5002 /* otherwise, add_new_disk is only allowed
5003 * for major_version==0 superblocks
5005 if (mddev
->major_version
!= 0) {
5006 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5011 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5013 rdev
= md_import_device(dev
, -1, 0);
5016 "md: error, md_import_device() returned %ld\n",
5018 return PTR_ERR(rdev
);
5020 rdev
->desc_nr
= info
->number
;
5021 if (info
->raid_disk
< mddev
->raid_disks
)
5022 rdev
->raid_disk
= info
->raid_disk
;
5024 rdev
->raid_disk
= -1;
5026 if (rdev
->raid_disk
< mddev
->raid_disks
)
5027 if (info
->state
& (1<<MD_DISK_SYNC
))
5028 set_bit(In_sync
, &rdev
->flags
);
5030 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5031 set_bit(WriteMostly
, &rdev
->flags
);
5033 if (!mddev
->persistent
) {
5034 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5035 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5037 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5038 rdev
->sectors
= rdev
->sb_start
;
5040 err
= bind_rdev_to_array(rdev
, mddev
);
5050 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5052 char b
[BDEVNAME_SIZE
];
5055 rdev
= find_rdev(mddev
, dev
);
5059 if (rdev
->raid_disk
>= 0)
5062 kick_rdev_from_array(rdev
);
5063 md_update_sb(mddev
, 1);
5064 md_new_event(mddev
);
5068 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5069 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5073 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5075 char b
[BDEVNAME_SIZE
];
5082 if (mddev
->major_version
!= 0) {
5083 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5084 " version-0 superblocks.\n",
5088 if (!mddev
->pers
->hot_add_disk
) {
5090 "%s: personality does not support diskops!\n",
5095 rdev
= md_import_device(dev
, -1, 0);
5098 "md: error, md_import_device() returned %ld\n",
5103 if (mddev
->persistent
)
5104 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5106 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5108 rdev
->sectors
= rdev
->sb_start
;
5110 if (test_bit(Faulty
, &rdev
->flags
)) {
5112 "md: can not hot-add faulty %s disk to %s!\n",
5113 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5117 clear_bit(In_sync
, &rdev
->flags
);
5119 rdev
->saved_raid_disk
= -1;
5120 err
= bind_rdev_to_array(rdev
, mddev
);
5125 * The rest should better be atomic, we can have disk failures
5126 * noticed in interrupt contexts ...
5129 rdev
->raid_disk
= -1;
5131 md_update_sb(mddev
, 1);
5134 * Kick recovery, maybe this spare has to be added to the
5135 * array immediately.
5137 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5138 md_wakeup_thread(mddev
->thread
);
5139 md_new_event(mddev
);
5147 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5152 if (!mddev
->pers
->quiesce
)
5154 if (mddev
->recovery
|| mddev
->sync_thread
)
5156 /* we should be able to change the bitmap.. */
5162 return -EEXIST
; /* cannot add when bitmap is present */
5163 mddev
->bitmap_info
.file
= fget(fd
);
5165 if (mddev
->bitmap_info
.file
== NULL
) {
5166 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5171 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5173 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5175 fput(mddev
->bitmap_info
.file
);
5176 mddev
->bitmap_info
.file
= NULL
;
5179 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5180 } else if (mddev
->bitmap
== NULL
)
5181 return -ENOENT
; /* cannot remove what isn't there */
5184 mddev
->pers
->quiesce(mddev
, 1);
5186 err
= bitmap_create(mddev
);
5187 if (fd
< 0 || err
) {
5188 bitmap_destroy(mddev
);
5189 fd
= -1; /* make sure to put the file */
5191 mddev
->pers
->quiesce(mddev
, 0);
5194 if (mddev
->bitmap_info
.file
) {
5195 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5196 fput(mddev
->bitmap_info
.file
);
5198 mddev
->bitmap_info
.file
= NULL
;
5205 * set_array_info is used two different ways
5206 * The original usage is when creating a new array.
5207 * In this usage, raid_disks is > 0 and it together with
5208 * level, size, not_persistent,layout,chunksize determine the
5209 * shape of the array.
5210 * This will always create an array with a type-0.90.0 superblock.
5211 * The newer usage is when assembling an array.
5212 * In this case raid_disks will be 0, and the major_version field is
5213 * use to determine which style super-blocks are to be found on the devices.
5214 * The minor and patch _version numbers are also kept incase the
5215 * super_block handler wishes to interpret them.
5217 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5220 if (info
->raid_disks
== 0) {
5221 /* just setting version number for superblock loading */
5222 if (info
->major_version
< 0 ||
5223 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5224 super_types
[info
->major_version
].name
== NULL
) {
5225 /* maybe try to auto-load a module? */
5227 "md: superblock version %d not known\n",
5228 info
->major_version
);
5231 mddev
->major_version
= info
->major_version
;
5232 mddev
->minor_version
= info
->minor_version
;
5233 mddev
->patch_version
= info
->patch_version
;
5234 mddev
->persistent
= !info
->not_persistent
;
5237 mddev
->major_version
= MD_MAJOR_VERSION
;
5238 mddev
->minor_version
= MD_MINOR_VERSION
;
5239 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5240 mddev
->ctime
= get_seconds();
5242 mddev
->level
= info
->level
;
5243 mddev
->clevel
[0] = 0;
5244 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5245 mddev
->raid_disks
= info
->raid_disks
;
5246 /* don't set md_minor, it is determined by which /dev/md* was
5249 if (info
->state
& (1<<MD_SB_CLEAN
))
5250 mddev
->recovery_cp
= MaxSector
;
5252 mddev
->recovery_cp
= 0;
5253 mddev
->persistent
= ! info
->not_persistent
;
5254 mddev
->external
= 0;
5256 mddev
->layout
= info
->layout
;
5257 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5259 mddev
->max_disks
= MD_SB_DISKS
;
5261 if (mddev
->persistent
)
5263 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5265 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5266 mddev
->bitmap_info
.offset
= 0;
5268 mddev
->reshape_position
= MaxSector
;
5271 * Generate a 128 bit UUID
5273 get_random_bytes(mddev
->uuid
, 16);
5275 mddev
->new_level
= mddev
->level
;
5276 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5277 mddev
->new_layout
= mddev
->layout
;
5278 mddev
->delta_disks
= 0;
5283 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5285 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5287 if (mddev
->external_size
)
5290 mddev
->array_sectors
= array_sectors
;
5292 EXPORT_SYMBOL(md_set_array_sectors
);
5294 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5298 int fit
= (num_sectors
== 0);
5300 if (mddev
->pers
->resize
== NULL
)
5302 /* The "num_sectors" is the number of sectors of each device that
5303 * is used. This can only make sense for arrays with redundancy.
5304 * linear and raid0 always use whatever space is available. We can only
5305 * consider changing this number if no resync or reconstruction is
5306 * happening, and if the new size is acceptable. It must fit before the
5307 * sb_start or, if that is <data_offset, it must fit before the size
5308 * of each device. If num_sectors is zero, we find the largest size
5312 if (mddev
->sync_thread
)
5315 /* Sorry, cannot grow a bitmap yet, just remove it,
5319 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5320 sector_t avail
= rdev
->sectors
;
5322 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5323 num_sectors
= avail
;
5324 if (avail
< num_sectors
)
5327 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5329 revalidate_disk(mddev
->gendisk
);
5333 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5336 /* change the number of raid disks */
5337 if (mddev
->pers
->check_reshape
== NULL
)
5339 if (raid_disks
<= 0 ||
5340 raid_disks
>= mddev
->max_disks
)
5342 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5344 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5346 rv
= mddev
->pers
->check_reshape(mddev
);
5352 * update_array_info is used to change the configuration of an
5354 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5355 * fields in the info are checked against the array.
5356 * Any differences that cannot be handled will cause an error.
5357 * Normally, only one change can be managed at a time.
5359 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5365 /* calculate expected state,ignoring low bits */
5366 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5367 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5369 if (mddev
->major_version
!= info
->major_version
||
5370 mddev
->minor_version
!= info
->minor_version
||
5371 /* mddev->patch_version != info->patch_version || */
5372 mddev
->ctime
!= info
->ctime
||
5373 mddev
->level
!= info
->level
||
5374 /* mddev->layout != info->layout || */
5375 !mddev
->persistent
!= info
->not_persistent
||
5376 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5377 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5378 ((state
^info
->state
) & 0xfffffe00)
5381 /* Check there is only one change */
5382 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5384 if (mddev
->raid_disks
!= info
->raid_disks
)
5386 if (mddev
->layout
!= info
->layout
)
5388 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5395 if (mddev
->layout
!= info
->layout
) {
5397 * we don't need to do anything at the md level, the
5398 * personality will take care of it all.
5400 if (mddev
->pers
->check_reshape
== NULL
)
5403 mddev
->new_layout
= info
->layout
;
5404 rv
= mddev
->pers
->check_reshape(mddev
);
5406 mddev
->new_layout
= mddev
->layout
;
5410 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5411 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5413 if (mddev
->raid_disks
!= info
->raid_disks
)
5414 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5416 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5417 if (mddev
->pers
->quiesce
== NULL
)
5419 if (mddev
->recovery
|| mddev
->sync_thread
)
5421 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5422 /* add the bitmap */
5425 if (mddev
->bitmap_info
.default_offset
== 0)
5427 mddev
->bitmap_info
.offset
=
5428 mddev
->bitmap_info
.default_offset
;
5429 mddev
->pers
->quiesce(mddev
, 1);
5430 rv
= bitmap_create(mddev
);
5432 bitmap_destroy(mddev
);
5433 mddev
->pers
->quiesce(mddev
, 0);
5435 /* remove the bitmap */
5438 if (mddev
->bitmap
->file
)
5440 mddev
->pers
->quiesce(mddev
, 1);
5441 bitmap_destroy(mddev
);
5442 mddev
->pers
->quiesce(mddev
, 0);
5443 mddev
->bitmap_info
.offset
= 0;
5446 md_update_sb(mddev
, 1);
5450 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5454 if (mddev
->pers
== NULL
)
5457 rdev
= find_rdev(mddev
, dev
);
5461 md_error(mddev
, rdev
);
5466 * We have a problem here : there is no easy way to give a CHS
5467 * virtual geometry. We currently pretend that we have a 2 heads
5468 * 4 sectors (with a BIG number of cylinders...). This drives
5469 * dosfs just mad... ;-)
5471 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5473 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5477 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
5481 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5482 unsigned int cmd
, unsigned long arg
)
5485 void __user
*argp
= (void __user
*)arg
;
5486 mddev_t
*mddev
= NULL
;
5488 if (!capable(CAP_SYS_ADMIN
))
5492 * Commands dealing with the RAID driver but not any
5498 err
= get_version(argp
);
5501 case PRINT_RAID_DEBUG
:
5509 autostart_arrays(arg
);
5516 * Commands creating/starting a new array:
5519 mddev
= bdev
->bd_disk
->private_data
;
5526 err
= mddev_lock(mddev
);
5529 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5536 case SET_ARRAY_INFO
:
5538 mdu_array_info_t info
;
5540 memset(&info
, 0, sizeof(info
));
5541 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5546 err
= update_array_info(mddev
, &info
);
5548 printk(KERN_WARNING
"md: couldn't update"
5549 " array info. %d\n", err
);
5554 if (!list_empty(&mddev
->disks
)) {
5556 "md: array %s already has disks!\n",
5561 if (mddev
->raid_disks
) {
5563 "md: array %s already initialised!\n",
5568 err
= set_array_info(mddev
, &info
);
5570 printk(KERN_WARNING
"md: couldn't set"
5571 " array info. %d\n", err
);
5581 * Commands querying/configuring an existing array:
5583 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5584 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5585 if ((!mddev
->raid_disks
&& !mddev
->external
)
5586 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5587 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5588 && cmd
!= GET_BITMAP_FILE
) {
5594 * Commands even a read-only array can execute:
5598 case GET_ARRAY_INFO
:
5599 err
= get_array_info(mddev
, argp
);
5602 case GET_BITMAP_FILE
:
5603 err
= get_bitmap_file(mddev
, argp
);
5607 err
= get_disk_info(mddev
, argp
);
5610 case RESTART_ARRAY_RW
:
5611 err
= restart_array(mddev
);
5615 err
= do_md_stop(mddev
, 0, 1);
5619 err
= do_md_stop(mddev
, 1, 1);
5625 * The remaining ioctls are changing the state of the
5626 * superblock, so we do not allow them on read-only arrays.
5627 * However non-MD ioctls (e.g. get-size) will still come through
5628 * here and hit the 'default' below, so only disallow
5629 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5631 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5632 if (mddev
->ro
== 2) {
5634 sysfs_notify_dirent(mddev
->sysfs_state
);
5635 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5636 md_wakeup_thread(mddev
->thread
);
5647 mdu_disk_info_t info
;
5648 if (copy_from_user(&info
, argp
, sizeof(info
)))
5651 err
= add_new_disk(mddev
, &info
);
5655 case HOT_REMOVE_DISK
:
5656 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5660 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5663 case SET_DISK_FAULTY
:
5664 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5668 err
= do_md_run(mddev
);
5671 case SET_BITMAP_FILE
:
5672 err
= set_bitmap_file(mddev
, (int)arg
);
5682 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5684 mddev
->hold_active
= 0;
5685 mddev_unlock(mddev
);
5695 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5698 * Succeed if we can lock the mddev, which confirms that
5699 * it isn't being stopped right now.
5701 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5704 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5705 /* we are racing with mddev_put which is discarding this
5709 /* Wait until bdev->bd_disk is definitely gone */
5710 flush_scheduled_work();
5711 /* Then retry the open from the top */
5712 return -ERESTARTSYS
;
5714 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5716 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5720 atomic_inc(&mddev
->openers
);
5721 mutex_unlock(&mddev
->open_mutex
);
5723 check_disk_change(bdev
);
5728 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5730 mddev_t
*mddev
= disk
->private_data
;
5733 atomic_dec(&mddev
->openers
);
5739 static int md_media_changed(struct gendisk
*disk
)
5741 mddev_t
*mddev
= disk
->private_data
;
5743 return mddev
->changed
;
5746 static int md_revalidate(struct gendisk
*disk
)
5748 mddev_t
*mddev
= disk
->private_data
;
5753 static const struct block_device_operations md_fops
=
5755 .owner
= THIS_MODULE
,
5757 .release
= md_release
,
5759 .getgeo
= md_getgeo
,
5760 .media_changed
= md_media_changed
,
5761 .revalidate_disk
= md_revalidate
,
5764 static int md_thread(void * arg
)
5766 mdk_thread_t
*thread
= arg
;
5769 * md_thread is a 'system-thread', it's priority should be very
5770 * high. We avoid resource deadlocks individually in each
5771 * raid personality. (RAID5 does preallocation) We also use RR and
5772 * the very same RT priority as kswapd, thus we will never get
5773 * into a priority inversion deadlock.
5775 * we definitely have to have equal or higher priority than
5776 * bdflush, otherwise bdflush will deadlock if there are too
5777 * many dirty RAID5 blocks.
5780 allow_signal(SIGKILL
);
5781 while (!kthread_should_stop()) {
5783 /* We need to wait INTERRUPTIBLE so that
5784 * we don't add to the load-average.
5785 * That means we need to be sure no signals are
5788 if (signal_pending(current
))
5789 flush_signals(current
);
5791 wait_event_interruptible_timeout
5793 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5794 || kthread_should_stop(),
5797 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5799 thread
->run(thread
->mddev
);
5805 void md_wakeup_thread(mdk_thread_t
*thread
)
5808 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5809 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5810 wake_up(&thread
->wqueue
);
5814 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5817 mdk_thread_t
*thread
;
5819 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5823 init_waitqueue_head(&thread
->wqueue
);
5826 thread
->mddev
= mddev
;
5827 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5828 thread
->tsk
= kthread_run(md_thread
, thread
,
5830 mdname(thread
->mddev
),
5831 name
?: mddev
->pers
->name
);
5832 if (IS_ERR(thread
->tsk
)) {
5839 void md_unregister_thread(mdk_thread_t
*thread
)
5843 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5845 kthread_stop(thread
->tsk
);
5849 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5856 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5859 if (mddev
->external
)
5860 set_bit(Blocked
, &rdev
->flags
);
5862 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5864 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5865 __builtin_return_address(0),__builtin_return_address(1),
5866 __builtin_return_address(2),__builtin_return_address(3));
5870 if (!mddev
->pers
->error_handler
)
5872 mddev
->pers
->error_handler(mddev
,rdev
);
5873 if (mddev
->degraded
)
5874 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5875 set_bit(StateChanged
, &rdev
->flags
);
5876 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5877 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5878 md_wakeup_thread(mddev
->thread
);
5879 md_new_event_inintr(mddev
);
5882 /* seq_file implementation /proc/mdstat */
5884 static void status_unused(struct seq_file
*seq
)
5889 seq_printf(seq
, "unused devices: ");
5891 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5892 char b
[BDEVNAME_SIZE
];
5894 seq_printf(seq
, "%s ",
5895 bdevname(rdev
->bdev
,b
));
5898 seq_printf(seq
, "<none>");
5900 seq_printf(seq
, "\n");
5904 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5906 sector_t max_sectors
, resync
, res
;
5907 unsigned long dt
, db
;
5910 unsigned int per_milli
;
5912 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
5914 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5915 max_sectors
= mddev
->resync_max_sectors
;
5917 max_sectors
= mddev
->dev_sectors
;
5920 * Should not happen.
5926 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5927 * in a sector_t, and (max_sectors>>scale) will fit in a
5928 * u32, as those are the requirements for sector_div.
5929 * Thus 'scale' must be at least 10
5932 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5933 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
5936 res
= (resync
>>scale
)*1000;
5937 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
5941 int i
, x
= per_milli
/50, y
= 20-x
;
5942 seq_printf(seq
, "[");
5943 for (i
= 0; i
< x
; i
++)
5944 seq_printf(seq
, "=");
5945 seq_printf(seq
, ">");
5946 for (i
= 0; i
< y
; i
++)
5947 seq_printf(seq
, ".");
5948 seq_printf(seq
, "] ");
5950 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5951 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5953 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5955 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5956 "resync" : "recovery"))),
5957 per_milli
/10, per_milli
% 10,
5958 (unsigned long long) resync
/2,
5959 (unsigned long long) max_sectors
/2);
5962 * dt: time from mark until now
5963 * db: blocks written from mark until now
5964 * rt: remaining time
5966 * rt is a sector_t, so could be 32bit or 64bit.
5967 * So we divide before multiply in case it is 32bit and close
5969 * We scale the divisor (db) by 32 to avoid loosing precision
5970 * near the end of resync when the number of remaining sectors
5972 * We then divide rt by 32 after multiplying by db to compensate.
5973 * The '+1' avoids division by zero if db is very small.
5975 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5977 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5978 - mddev
->resync_mark_cnt
;
5980 rt
= max_sectors
- resync
; /* number of remaining sectors */
5981 sector_div(rt
, db
/32+1);
5985 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
5986 ((unsigned long)rt
% 60)/6);
5988 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5991 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5993 struct list_head
*tmp
;
6003 spin_lock(&all_mddevs_lock
);
6004 list_for_each(tmp
,&all_mddevs
)
6006 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6008 spin_unlock(&all_mddevs_lock
);
6011 spin_unlock(&all_mddevs_lock
);
6013 return (void*)2;/* tail */
6017 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6019 struct list_head
*tmp
;
6020 mddev_t
*next_mddev
, *mddev
= v
;
6026 spin_lock(&all_mddevs_lock
);
6028 tmp
= all_mddevs
.next
;
6030 tmp
= mddev
->all_mddevs
.next
;
6031 if (tmp
!= &all_mddevs
)
6032 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6034 next_mddev
= (void*)2;
6037 spin_unlock(&all_mddevs_lock
);
6045 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6049 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6053 struct mdstat_info
{
6057 static int md_seq_show(struct seq_file
*seq
, void *v
)
6062 struct mdstat_info
*mi
= seq
->private;
6063 struct bitmap
*bitmap
;
6065 if (v
== (void*)1) {
6066 struct mdk_personality
*pers
;
6067 seq_printf(seq
, "Personalities : ");
6068 spin_lock(&pers_lock
);
6069 list_for_each_entry(pers
, &pers_list
, list
)
6070 seq_printf(seq
, "[%s] ", pers
->name
);
6072 spin_unlock(&pers_lock
);
6073 seq_printf(seq
, "\n");
6074 mi
->event
= atomic_read(&md_event_count
);
6077 if (v
== (void*)2) {
6082 if (mddev_lock(mddev
) < 0)
6085 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6086 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6087 mddev
->pers
? "" : "in");
6090 seq_printf(seq
, " (read-only)");
6092 seq_printf(seq
, " (auto-read-only)");
6093 seq_printf(seq
, " %s", mddev
->pers
->name
);
6097 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6098 char b
[BDEVNAME_SIZE
];
6099 seq_printf(seq
, " %s[%d]",
6100 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6101 if (test_bit(WriteMostly
, &rdev
->flags
))
6102 seq_printf(seq
, "(W)");
6103 if (test_bit(Faulty
, &rdev
->flags
)) {
6104 seq_printf(seq
, "(F)");
6106 } else if (rdev
->raid_disk
< 0)
6107 seq_printf(seq
, "(S)"); /* spare */
6108 sectors
+= rdev
->sectors
;
6111 if (!list_empty(&mddev
->disks
)) {
6113 seq_printf(seq
, "\n %llu blocks",
6114 (unsigned long long)
6115 mddev
->array_sectors
/ 2);
6117 seq_printf(seq
, "\n %llu blocks",
6118 (unsigned long long)sectors
/ 2);
6120 if (mddev
->persistent
) {
6121 if (mddev
->major_version
!= 0 ||
6122 mddev
->minor_version
!= 90) {
6123 seq_printf(seq
," super %d.%d",
6124 mddev
->major_version
,
6125 mddev
->minor_version
);
6127 } else if (mddev
->external
)
6128 seq_printf(seq
, " super external:%s",
6129 mddev
->metadata_type
);
6131 seq_printf(seq
, " super non-persistent");
6134 mddev
->pers
->status(seq
, mddev
);
6135 seq_printf(seq
, "\n ");
6136 if (mddev
->pers
->sync_request
) {
6137 if (mddev
->curr_resync
> 2) {
6138 status_resync(seq
, mddev
);
6139 seq_printf(seq
, "\n ");
6140 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6141 seq_printf(seq
, "\tresync=DELAYED\n ");
6142 else if (mddev
->recovery_cp
< MaxSector
)
6143 seq_printf(seq
, "\tresync=PENDING\n ");
6146 seq_printf(seq
, "\n ");
6148 if ((bitmap
= mddev
->bitmap
)) {
6149 unsigned long chunk_kb
;
6150 unsigned long flags
;
6151 spin_lock_irqsave(&bitmap
->lock
, flags
);
6152 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6153 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6155 bitmap
->pages
- bitmap
->missing_pages
,
6157 (bitmap
->pages
- bitmap
->missing_pages
)
6158 << (PAGE_SHIFT
- 10),
6159 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6160 chunk_kb
? "KB" : "B");
6162 seq_printf(seq
, ", file: ");
6163 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6166 seq_printf(seq
, "\n");
6167 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6170 seq_printf(seq
, "\n");
6172 mddev_unlock(mddev
);
6177 static const struct seq_operations md_seq_ops
= {
6178 .start
= md_seq_start
,
6179 .next
= md_seq_next
,
6180 .stop
= md_seq_stop
,
6181 .show
= md_seq_show
,
6184 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6187 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6191 error
= seq_open(file
, &md_seq_ops
);
6195 struct seq_file
*p
= file
->private_data
;
6197 mi
->event
= atomic_read(&md_event_count
);
6202 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6204 struct seq_file
*m
= filp
->private_data
;
6205 struct mdstat_info
*mi
= m
->private;
6208 poll_wait(filp
, &md_event_waiters
, wait
);
6210 /* always allow read */
6211 mask
= POLLIN
| POLLRDNORM
;
6213 if (mi
->event
!= atomic_read(&md_event_count
))
6214 mask
|= POLLERR
| POLLPRI
;
6218 static const struct file_operations md_seq_fops
= {
6219 .owner
= THIS_MODULE
,
6220 .open
= md_seq_open
,
6222 .llseek
= seq_lseek
,
6223 .release
= seq_release_private
,
6224 .poll
= mdstat_poll
,
6227 int register_md_personality(struct mdk_personality
*p
)
6229 spin_lock(&pers_lock
);
6230 list_add_tail(&p
->list
, &pers_list
);
6231 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6232 spin_unlock(&pers_lock
);
6236 int unregister_md_personality(struct mdk_personality
*p
)
6238 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6239 spin_lock(&pers_lock
);
6240 list_del_init(&p
->list
);
6241 spin_unlock(&pers_lock
);
6245 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6253 rdev_for_each_rcu(rdev
, mddev
) {
6254 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6255 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6256 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6257 atomic_read(&disk
->sync_io
);
6258 /* sync IO will cause sync_io to increase before the disk_stats
6259 * as sync_io is counted when a request starts, and
6260 * disk_stats is counted when it completes.
6261 * So resync activity will cause curr_events to be smaller than
6262 * when there was no such activity.
6263 * non-sync IO will cause disk_stat to increase without
6264 * increasing sync_io so curr_events will (eventually)
6265 * be larger than it was before. Once it becomes
6266 * substantially larger, the test below will cause
6267 * the array to appear non-idle, and resync will slow
6269 * If there is a lot of outstanding resync activity when
6270 * we set last_event to curr_events, then all that activity
6271 * completing might cause the array to appear non-idle
6272 * and resync will be slowed down even though there might
6273 * not have been non-resync activity. This will only
6274 * happen once though. 'last_events' will soon reflect
6275 * the state where there is little or no outstanding
6276 * resync requests, and further resync activity will
6277 * always make curr_events less than last_events.
6280 if (init
|| curr_events
- rdev
->last_events
> 64) {
6281 rdev
->last_events
= curr_events
;
6289 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6291 /* another "blocks" (512byte) blocks have been synced */
6292 atomic_sub(blocks
, &mddev
->recovery_active
);
6293 wake_up(&mddev
->recovery_wait
);
6295 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6296 md_wakeup_thread(mddev
->thread
);
6297 // stop recovery, signal do_sync ....
6302 /* md_write_start(mddev, bi)
6303 * If we need to update some array metadata (e.g. 'active' flag
6304 * in superblock) before writing, schedule a superblock update
6305 * and wait for it to complete.
6307 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6310 if (bio_data_dir(bi
) != WRITE
)
6313 BUG_ON(mddev
->ro
== 1);
6314 if (mddev
->ro
== 2) {
6315 /* need to switch to read/write */
6317 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6318 md_wakeup_thread(mddev
->thread
);
6319 md_wakeup_thread(mddev
->sync_thread
);
6322 atomic_inc(&mddev
->writes_pending
);
6323 if (mddev
->safemode
== 1)
6324 mddev
->safemode
= 0;
6325 if (mddev
->in_sync
) {
6326 spin_lock_irq(&mddev
->write_lock
);
6327 if (mddev
->in_sync
) {
6329 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6330 md_wakeup_thread(mddev
->thread
);
6333 spin_unlock_irq(&mddev
->write_lock
);
6336 sysfs_notify_dirent(mddev
->sysfs_state
);
6337 wait_event(mddev
->sb_wait
,
6338 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
6339 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6342 void md_write_end(mddev_t
*mddev
)
6344 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6345 if (mddev
->safemode
== 2)
6346 md_wakeup_thread(mddev
->thread
);
6347 else if (mddev
->safemode_delay
)
6348 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6352 /* md_allow_write(mddev)
6353 * Calling this ensures that the array is marked 'active' so that writes
6354 * may proceed without blocking. It is important to call this before
6355 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6356 * Must be called with mddev_lock held.
6358 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6359 * is dropped, so return -EAGAIN after notifying userspace.
6361 int md_allow_write(mddev_t
*mddev
)
6367 if (!mddev
->pers
->sync_request
)
6370 spin_lock_irq(&mddev
->write_lock
);
6371 if (mddev
->in_sync
) {
6373 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6374 if (mddev
->safemode_delay
&&
6375 mddev
->safemode
== 0)
6376 mddev
->safemode
= 1;
6377 spin_unlock_irq(&mddev
->write_lock
);
6378 md_update_sb(mddev
, 0);
6379 sysfs_notify_dirent(mddev
->sysfs_state
);
6381 spin_unlock_irq(&mddev
->write_lock
);
6383 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
6388 EXPORT_SYMBOL_GPL(md_allow_write
);
6390 #define SYNC_MARKS 10
6391 #define SYNC_MARK_STEP (3*HZ)
6392 void md_do_sync(mddev_t
*mddev
)
6395 unsigned int currspeed
= 0,
6397 sector_t max_sectors
,j
, io_sectors
;
6398 unsigned long mark
[SYNC_MARKS
];
6399 sector_t mark_cnt
[SYNC_MARKS
];
6401 struct list_head
*tmp
;
6402 sector_t last_check
;
6407 /* just incase thread restarts... */
6408 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6410 if (mddev
->ro
) /* never try to sync a read-only array */
6413 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6414 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6415 desc
= "data-check";
6416 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6417 desc
= "requested-resync";
6420 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6425 /* we overload curr_resync somewhat here.
6426 * 0 == not engaged in resync at all
6427 * 2 == checking that there is no conflict with another sync
6428 * 1 == like 2, but have yielded to allow conflicting resync to
6430 * other == active in resync - this many blocks
6432 * Before starting a resync we must have set curr_resync to
6433 * 2, and then checked that every "conflicting" array has curr_resync
6434 * less than ours. When we find one that is the same or higher
6435 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6436 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6437 * This will mean we have to start checking from the beginning again.
6442 mddev
->curr_resync
= 2;
6445 if (kthread_should_stop()) {
6446 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6449 for_each_mddev(mddev2
, tmp
) {
6450 if (mddev2
== mddev
)
6452 if (!mddev
->parallel_resync
6453 && mddev2
->curr_resync
6454 && match_mddev_units(mddev
, mddev2
)) {
6456 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6457 /* arbitrarily yield */
6458 mddev
->curr_resync
= 1;
6459 wake_up(&resync_wait
);
6461 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6462 /* no need to wait here, we can wait the next
6463 * time 'round when curr_resync == 2
6466 /* We need to wait 'interruptible' so as not to
6467 * contribute to the load average, and not to
6468 * be caught by 'softlockup'
6470 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6471 if (!kthread_should_stop() &&
6472 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6473 printk(KERN_INFO
"md: delaying %s of %s"
6474 " until %s has finished (they"
6475 " share one or more physical units)\n",
6476 desc
, mdname(mddev
), mdname(mddev2
));
6478 if (signal_pending(current
))
6479 flush_signals(current
);
6481 finish_wait(&resync_wait
, &wq
);
6484 finish_wait(&resync_wait
, &wq
);
6487 } while (mddev
->curr_resync
< 2);
6490 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6491 /* resync follows the size requested by the personality,
6492 * which defaults to physical size, but can be virtual size
6494 max_sectors
= mddev
->resync_max_sectors
;
6495 mddev
->resync_mismatches
= 0;
6496 /* we don't use the checkpoint if there's a bitmap */
6497 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6498 j
= mddev
->resync_min
;
6499 else if (!mddev
->bitmap
)
6500 j
= mddev
->recovery_cp
;
6502 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6503 max_sectors
= mddev
->dev_sectors
;
6505 /* recovery follows the physical size of devices */
6506 max_sectors
= mddev
->dev_sectors
;
6508 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6509 if (rdev
->raid_disk
>= 0 &&
6510 !test_bit(Faulty
, &rdev
->flags
) &&
6511 !test_bit(In_sync
, &rdev
->flags
) &&
6512 rdev
->recovery_offset
< j
)
6513 j
= rdev
->recovery_offset
;
6516 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6517 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6518 " %d KB/sec/disk.\n", speed_min(mddev
));
6519 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6520 "(but not more than %d KB/sec) for %s.\n",
6521 speed_max(mddev
), desc
);
6523 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6526 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6528 mark_cnt
[m
] = io_sectors
;
6531 mddev
->resync_mark
= mark
[last_mark
];
6532 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6535 * Tune reconstruction:
6537 window
= 32*(PAGE_SIZE
/512);
6538 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6539 window
/2,(unsigned long long) max_sectors
/2);
6541 atomic_set(&mddev
->recovery_active
, 0);
6546 "md: resuming %s of %s from checkpoint.\n",
6547 desc
, mdname(mddev
));
6548 mddev
->curr_resync
= j
;
6550 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6552 while (j
< max_sectors
) {
6557 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6558 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6559 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6560 > (max_sectors
>> 4)) ||
6561 (j
- mddev
->curr_resync_completed
)*2
6562 >= mddev
->resync_max
- mddev
->curr_resync_completed
6564 /* time to update curr_resync_completed */
6565 blk_unplug(mddev
->queue
);
6566 wait_event(mddev
->recovery_wait
,
6567 atomic_read(&mddev
->recovery_active
) == 0);
6568 mddev
->curr_resync_completed
=
6570 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6571 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6574 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6575 /* As this condition is controlled by user-space,
6576 * we can block indefinitely, so use '_interruptible'
6577 * to avoid triggering warnings.
6579 flush_signals(current
); /* just in case */
6580 wait_event_interruptible(mddev
->recovery_wait
,
6581 mddev
->resync_max
> j
6582 || kthread_should_stop());
6585 if (kthread_should_stop())
6588 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6589 currspeed
< speed_min(mddev
));
6591 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6595 if (!skipped
) { /* actual IO requested */
6596 io_sectors
+= sectors
;
6597 atomic_add(sectors
, &mddev
->recovery_active
);
6601 if (j
>1) mddev
->curr_resync
= j
;
6602 mddev
->curr_mark_cnt
= io_sectors
;
6603 if (last_check
== 0)
6604 /* this is the earliers that rebuilt will be
6605 * visible in /proc/mdstat
6607 md_new_event(mddev
);
6609 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6612 last_check
= io_sectors
;
6614 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6618 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6620 int next
= (last_mark
+1) % SYNC_MARKS
;
6622 mddev
->resync_mark
= mark
[next
];
6623 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6624 mark
[next
] = jiffies
;
6625 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6630 if (kthread_should_stop())
6635 * this loop exits only if either when we are slower than
6636 * the 'hard' speed limit, or the system was IO-idle for
6638 * the system might be non-idle CPU-wise, but we only care
6639 * about not overloading the IO subsystem. (things like an
6640 * e2fsck being done on the RAID array should execute fast)
6642 blk_unplug(mddev
->queue
);
6645 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6646 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6648 if (currspeed
> speed_min(mddev
)) {
6649 if ((currspeed
> speed_max(mddev
)) ||
6650 !is_mddev_idle(mddev
, 0)) {
6656 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6658 * this also signals 'finished resyncing' to md_stop
6661 blk_unplug(mddev
->queue
);
6663 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6665 /* tell personality that we are finished */
6666 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6668 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6669 mddev
->curr_resync
> 2) {
6670 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6671 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6672 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6674 "md: checkpointing %s of %s.\n",
6675 desc
, mdname(mddev
));
6676 mddev
->recovery_cp
= mddev
->curr_resync
;
6679 mddev
->recovery_cp
= MaxSector
;
6681 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6682 mddev
->curr_resync
= MaxSector
;
6683 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6684 if (rdev
->raid_disk
>= 0 &&
6685 !test_bit(Faulty
, &rdev
->flags
) &&
6686 !test_bit(In_sync
, &rdev
->flags
) &&
6687 rdev
->recovery_offset
< mddev
->curr_resync
)
6688 rdev
->recovery_offset
= mddev
->curr_resync
;
6691 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6694 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6695 /* We completed so min/max setting can be forgotten if used. */
6696 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6697 mddev
->resync_min
= 0;
6698 mddev
->resync_max
= MaxSector
;
6699 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6700 mddev
->resync_min
= mddev
->curr_resync_completed
;
6701 mddev
->curr_resync
= 0;
6702 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6703 mddev
->curr_resync_completed
= 0;
6704 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6705 wake_up(&resync_wait
);
6706 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6707 md_wakeup_thread(mddev
->thread
);
6712 * got a signal, exit.
6715 "md: md_do_sync() got signal ... exiting\n");
6716 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6720 EXPORT_SYMBOL_GPL(md_do_sync
);
6723 static int remove_and_add_spares(mddev_t
*mddev
)
6728 mddev
->curr_resync_completed
= 0;
6730 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6731 if (rdev
->raid_disk
>= 0 &&
6732 !test_bit(Blocked
, &rdev
->flags
) &&
6733 (test_bit(Faulty
, &rdev
->flags
) ||
6734 ! test_bit(In_sync
, &rdev
->flags
)) &&
6735 atomic_read(&rdev
->nr_pending
)==0) {
6736 if (mddev
->pers
->hot_remove_disk(
6737 mddev
, rdev
->raid_disk
)==0) {
6739 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6740 sysfs_remove_link(&mddev
->kobj
, nm
);
6741 rdev
->raid_disk
= -1;
6745 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6746 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6747 if (rdev
->raid_disk
>= 0 &&
6748 !test_bit(In_sync
, &rdev
->flags
) &&
6749 !test_bit(Blocked
, &rdev
->flags
))
6751 if (rdev
->raid_disk
< 0
6752 && !test_bit(Faulty
, &rdev
->flags
)) {
6753 rdev
->recovery_offset
= 0;
6755 hot_add_disk(mddev
, rdev
) == 0) {
6757 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6758 if (sysfs_create_link(&mddev
->kobj
,
6761 "md: cannot register "
6765 md_new_event(mddev
);
6774 * This routine is regularly called by all per-raid-array threads to
6775 * deal with generic issues like resync and super-block update.
6776 * Raid personalities that don't have a thread (linear/raid0) do not
6777 * need this as they never do any recovery or update the superblock.
6779 * It does not do any resync itself, but rather "forks" off other threads
6780 * to do that as needed.
6781 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6782 * "->recovery" and create a thread at ->sync_thread.
6783 * When the thread finishes it sets MD_RECOVERY_DONE
6784 * and wakeups up this thread which will reap the thread and finish up.
6785 * This thread also removes any faulty devices (with nr_pending == 0).
6787 * The overall approach is:
6788 * 1/ if the superblock needs updating, update it.
6789 * 2/ If a recovery thread is running, don't do anything else.
6790 * 3/ If recovery has finished, clean up, possibly marking spares active.
6791 * 4/ If there are any faulty devices, remove them.
6792 * 5/ If array is degraded, try to add spares devices
6793 * 6/ If array has spares or is not in-sync, start a resync thread.
6795 void md_check_recovery(mddev_t
*mddev
)
6801 bitmap_daemon_work(mddev
);
6806 if (signal_pending(current
)) {
6807 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6808 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6810 mddev
->safemode
= 2;
6812 flush_signals(current
);
6815 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6818 (mddev
->flags
&& !mddev
->external
) ||
6819 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6820 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6821 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6822 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6823 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6827 if (mddev_trylock(mddev
)) {
6831 /* Only thing we do on a ro array is remove
6834 remove_and_add_spares(mddev
);
6835 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6839 if (!mddev
->external
) {
6841 spin_lock_irq(&mddev
->write_lock
);
6842 if (mddev
->safemode
&&
6843 !atomic_read(&mddev
->writes_pending
) &&
6845 mddev
->recovery_cp
== MaxSector
) {
6848 if (mddev
->persistent
)
6849 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6851 if (mddev
->safemode
== 1)
6852 mddev
->safemode
= 0;
6853 spin_unlock_irq(&mddev
->write_lock
);
6855 sysfs_notify_dirent(mddev
->sysfs_state
);
6859 md_update_sb(mddev
, 0);
6861 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6862 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6863 sysfs_notify_dirent(rdev
->sysfs_state
);
6866 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6867 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6868 /* resync/recovery still happening */
6869 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6872 if (mddev
->sync_thread
) {
6873 /* resync has finished, collect result */
6874 md_unregister_thread(mddev
->sync_thread
);
6875 mddev
->sync_thread
= NULL
;
6876 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6877 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6879 /* activate any spares */
6880 if (mddev
->pers
->spare_active(mddev
))
6881 sysfs_notify(&mddev
->kobj
, NULL
,
6884 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6885 mddev
->pers
->finish_reshape
)
6886 mddev
->pers
->finish_reshape(mddev
);
6887 md_update_sb(mddev
, 1);
6889 /* if array is no-longer degraded, then any saved_raid_disk
6890 * information must be scrapped
6892 if (!mddev
->degraded
)
6893 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6894 rdev
->saved_raid_disk
= -1;
6896 mddev
->recovery
= 0;
6897 /* flag recovery needed just to double check */
6898 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6899 sysfs_notify_dirent(mddev
->sysfs_action
);
6900 md_new_event(mddev
);
6903 /* Set RUNNING before clearing NEEDED to avoid
6904 * any transients in the value of "sync_action".
6906 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6907 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6908 /* Clear some bits that don't mean anything, but
6911 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6912 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6914 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6916 /* no recovery is running.
6917 * remove any failed drives, then
6918 * add spares if possible.
6919 * Spare are also removed and re-added, to allow
6920 * the personality to fail the re-add.
6923 if (mddev
->reshape_position
!= MaxSector
) {
6924 if (mddev
->pers
->check_reshape
== NULL
||
6925 mddev
->pers
->check_reshape(mddev
) != 0)
6926 /* Cannot proceed */
6928 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6929 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6930 } else if ((spares
= remove_and_add_spares(mddev
))) {
6931 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6932 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6933 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6934 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6935 } else if (mddev
->recovery_cp
< MaxSector
) {
6936 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6937 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6938 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6939 /* nothing to be done ... */
6942 if (mddev
->pers
->sync_request
) {
6943 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6944 /* We are adding a device or devices to an array
6945 * which has the bitmap stored on all devices.
6946 * So make sure all bitmap pages get written
6948 bitmap_write_all(mddev
->bitmap
);
6950 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6953 if (!mddev
->sync_thread
) {
6954 printk(KERN_ERR
"%s: could not start resync"
6957 /* leave the spares where they are, it shouldn't hurt */
6958 mddev
->recovery
= 0;
6960 md_wakeup_thread(mddev
->sync_thread
);
6961 sysfs_notify_dirent(mddev
->sysfs_action
);
6962 md_new_event(mddev
);
6965 if (!mddev
->sync_thread
) {
6966 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6967 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6969 if (mddev
->sysfs_action
)
6970 sysfs_notify_dirent(mddev
->sysfs_action
);
6972 mddev_unlock(mddev
);
6976 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6978 sysfs_notify_dirent(rdev
->sysfs_state
);
6979 wait_event_timeout(rdev
->blocked_wait
,
6980 !test_bit(Blocked
, &rdev
->flags
),
6981 msecs_to_jiffies(5000));
6982 rdev_dec_pending(rdev
, mddev
);
6984 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6986 static int md_notify_reboot(struct notifier_block
*this,
6987 unsigned long code
, void *x
)
6989 struct list_head
*tmp
;
6992 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6994 printk(KERN_INFO
"md: stopping all md devices.\n");
6996 for_each_mddev(mddev
, tmp
)
6997 if (mddev_trylock(mddev
)) {
6998 /* Force a switch to readonly even array
6999 * appears to still be in use. Hence
7002 do_md_stop(mddev
, 1, 100);
7003 mddev_unlock(mddev
);
7006 * certain more exotic SCSI devices are known to be
7007 * volatile wrt too early system reboots. While the
7008 * right place to handle this issue is the given
7009 * driver, we do want to have a safe RAID driver ...
7016 static struct notifier_block md_notifier
= {
7017 .notifier_call
= md_notify_reboot
,
7019 .priority
= INT_MAX
, /* before any real devices */
7022 static void md_geninit(void)
7024 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7026 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7029 static int __init
md_init(void)
7031 if (register_blkdev(MD_MAJOR
, "md"))
7033 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
7034 unregister_blkdev(MD_MAJOR
, "md");
7037 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7038 md_probe
, NULL
, NULL
);
7039 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7040 md_probe
, NULL
, NULL
);
7042 register_reboot_notifier(&md_notifier
);
7043 raid_table_header
= register_sysctl_table(raid_root_table
);
7053 * Searches all registered partitions for autorun RAID arrays
7057 static LIST_HEAD(all_detected_devices
);
7058 struct detected_devices_node
{
7059 struct list_head list
;
7063 void md_autodetect_dev(dev_t dev
)
7065 struct detected_devices_node
*node_detected_dev
;
7067 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7068 if (node_detected_dev
) {
7069 node_detected_dev
->dev
= dev
;
7070 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7072 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7073 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7078 static void autostart_arrays(int part
)
7081 struct detected_devices_node
*node_detected_dev
;
7083 int i_scanned
, i_passed
;
7088 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7090 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7092 node_detected_dev
= list_entry(all_detected_devices
.next
,
7093 struct detected_devices_node
, list
);
7094 list_del(&node_detected_dev
->list
);
7095 dev
= node_detected_dev
->dev
;
7096 kfree(node_detected_dev
);
7097 rdev
= md_import_device(dev
,0, 90);
7101 if (test_bit(Faulty
, &rdev
->flags
)) {
7105 set_bit(AutoDetected
, &rdev
->flags
);
7106 list_add(&rdev
->same_set
, &pending_raid_disks
);
7110 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7111 i_scanned
, i_passed
);
7113 autorun_devices(part
);
7116 #endif /* !MODULE */
7118 static __exit
void md_exit(void)
7121 struct list_head
*tmp
;
7123 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7124 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7126 unregister_blkdev(MD_MAJOR
,"md");
7127 unregister_blkdev(mdp_major
, "mdp");
7128 unregister_reboot_notifier(&md_notifier
);
7129 unregister_sysctl_table(raid_table_header
);
7130 remove_proc_entry("mdstat", NULL
);
7131 for_each_mddev(mddev
, tmp
) {
7132 export_array(mddev
);
7133 mddev
->hold_active
= 0;
7137 subsys_initcall(md_init
);
7138 module_exit(md_exit
)
7140 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7142 return sprintf(buffer
, "%d", start_readonly
);
7144 static int set_ro(const char *val
, struct kernel_param
*kp
)
7147 int num
= simple_strtoul(val
, &e
, 10);
7148 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7149 start_readonly
= num
;
7155 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7156 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7158 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7160 EXPORT_SYMBOL(register_md_personality
);
7161 EXPORT_SYMBOL(unregister_md_personality
);
7162 EXPORT_SYMBOL(md_error
);
7163 EXPORT_SYMBOL(md_done_sync
);
7164 EXPORT_SYMBOL(md_write_start
);
7165 EXPORT_SYMBOL(md_write_end
);
7166 EXPORT_SYMBOL(md_register_thread
);
7167 EXPORT_SYMBOL(md_unregister_thread
);
7168 EXPORT_SYMBOL(md_wakeup_thread
);
7169 EXPORT_SYMBOL(md_check_recovery
);
7170 MODULE_LICENSE("GPL");
7172 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);