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/module.h>
36 #include <linux/kernel.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part
);
72 static LIST_HEAD(pers_list
);
73 static DEFINE_SPINLOCK(pers_lock
);
75 static void md_print_devices(void);
77 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
79 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min
= 1000;
95 static int sysctl_speed_limit_max
= 200000;
96 static inline int speed_min(mddev_t
*mddev
)
98 return mddev
->sync_speed_min
?
99 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
102 static inline int speed_max(mddev_t
*mddev
)
104 return mddev
->sync_speed_max
?
105 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
108 static struct ctl_table_header
*raid_table_header
;
110 static ctl_table raid_table
[] = {
112 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
113 .procname
= "speed_limit_min",
114 .data
= &sysctl_speed_limit_min
,
115 .maxlen
= sizeof(int),
116 .mode
= S_IRUGO
|S_IWUSR
,
117 .proc_handler
= &proc_dointvec
,
120 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
121 .procname
= "speed_limit_max",
122 .data
= &sysctl_speed_limit_max
,
123 .maxlen
= sizeof(int),
124 .mode
= S_IRUGO
|S_IWUSR
,
125 .proc_handler
= &proc_dointvec
,
130 static ctl_table raid_dir_table
[] = {
132 .ctl_name
= DEV_RAID
,
135 .mode
= S_IRUGO
|S_IXUGO
,
141 static ctl_table raid_root_table
[] = {
147 .child
= raid_dir_table
,
152 static struct block_device_operations md_fops
;
154 static int start_readonly
;
157 * We have a system wide 'event count' that is incremented
158 * on any 'interesting' event, and readers of /proc/mdstat
159 * can use 'poll' or 'select' to find out when the event
163 * start array, stop array, error, add device, remove device,
164 * start build, activate spare
166 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
167 static atomic_t md_event_count
;
168 void md_new_event(mddev_t
*mddev
)
170 atomic_inc(&md_event_count
);
171 wake_up(&md_event_waiters
);
173 EXPORT_SYMBOL_GPL(md_new_event
);
175 /* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
178 static void md_new_event_inintr(mddev_t
*mddev
)
180 atomic_inc(&md_event_count
);
181 wake_up(&md_event_waiters
);
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
188 static LIST_HEAD(all_mddevs
);
189 static DEFINE_SPINLOCK(all_mddevs_lock
);
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
199 #define for_each_mddev(mddev,tmp) \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
215 static int md_fail_request (struct request_queue
*q
, struct bio
*bio
)
221 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
223 atomic_inc(&mddev
->active
);
227 static void mddev_put(mddev_t
*mddev
)
229 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
231 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
232 list_del(&mddev
->all_mddevs
);
233 spin_unlock(&all_mddevs_lock
);
234 blk_cleanup_queue(mddev
->queue
);
235 kobject_put(&mddev
->kobj
);
237 spin_unlock(&all_mddevs_lock
);
240 static mddev_t
* mddev_find(dev_t unit
)
242 mddev_t
*mddev
, *new = NULL
;
245 spin_lock(&all_mddevs_lock
);
246 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
247 if (mddev
->unit
== unit
) {
249 spin_unlock(&all_mddevs_lock
);
255 list_add(&new->all_mddevs
, &all_mddevs
);
256 spin_unlock(&all_mddevs_lock
);
259 spin_unlock(&all_mddevs_lock
);
261 new = kzalloc(sizeof(*new), GFP_KERNEL
);
266 if (MAJOR(unit
) == MD_MAJOR
)
267 new->md_minor
= MINOR(unit
);
269 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
271 mutex_init(&new->reconfig_mutex
);
272 INIT_LIST_HEAD(&new->disks
);
273 INIT_LIST_HEAD(&new->all_mddevs
);
274 init_timer(&new->safemode_timer
);
275 atomic_set(&new->active
, 1);
276 spin_lock_init(&new->write_lock
);
277 init_waitqueue_head(&new->sb_wait
);
278 init_waitqueue_head(&new->recovery_wait
);
279 new->reshape_position
= MaxSector
;
281 new->resync_max
= MaxSector
;
282 new->level
= LEVEL_NONE
;
284 new->queue
= blk_alloc_queue(GFP_KERNEL
);
289 /* Can be unlocked because the queue is new: no concurrency */
290 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, new->queue
);
292 blk_queue_make_request(new->queue
, md_fail_request
);
297 static inline int mddev_lock(mddev_t
* mddev
)
299 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
302 static inline int mddev_trylock(mddev_t
* mddev
)
304 return mutex_trylock(&mddev
->reconfig_mutex
);
307 static inline void mddev_unlock(mddev_t
* mddev
)
309 mutex_unlock(&mddev
->reconfig_mutex
);
311 md_wakeup_thread(mddev
->thread
);
314 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
317 struct list_head
*tmp
;
319 rdev_for_each(rdev
, tmp
, mddev
) {
320 if (rdev
->desc_nr
== nr
)
326 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
328 struct list_head
*tmp
;
331 rdev_for_each(rdev
, tmp
, mddev
) {
332 if (rdev
->bdev
->bd_dev
== dev
)
338 static struct mdk_personality
*find_pers(int level
, char *clevel
)
340 struct mdk_personality
*pers
;
341 list_for_each_entry(pers
, &pers_list
, list
) {
342 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
344 if (strcmp(pers
->name
, clevel
)==0)
350 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
352 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
353 return MD_NEW_SIZE_BLOCKS(size
);
356 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
360 size
= rdev
->sb_offset
;
363 size
&= ~((sector_t
)chunk_size
/1024 - 1);
367 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
372 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
373 if (!rdev
->sb_page
) {
374 printk(KERN_ALERT
"md: out of memory.\n");
381 static void free_disk_sb(mdk_rdev_t
* rdev
)
384 put_page(rdev
->sb_page
);
386 rdev
->sb_page
= NULL
;
393 static void super_written(struct bio
*bio
, int error
)
395 mdk_rdev_t
*rdev
= bio
->bi_private
;
396 mddev_t
*mddev
= rdev
->mddev
;
398 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
399 printk("md: super_written gets error=%d, uptodate=%d\n",
400 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
401 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
402 md_error(mddev
, rdev
);
405 if (atomic_dec_and_test(&mddev
->pending_writes
))
406 wake_up(&mddev
->sb_wait
);
410 static void super_written_barrier(struct bio
*bio
, int error
)
412 struct bio
*bio2
= bio
->bi_private
;
413 mdk_rdev_t
*rdev
= bio2
->bi_private
;
414 mddev_t
*mddev
= rdev
->mddev
;
416 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
417 error
== -EOPNOTSUPP
) {
419 /* barriers don't appear to be supported :-( */
420 set_bit(BarriersNotsupp
, &rdev
->flags
);
421 mddev
->barriers_work
= 0;
422 spin_lock_irqsave(&mddev
->write_lock
, flags
);
423 bio2
->bi_next
= mddev
->biolist
;
424 mddev
->biolist
= bio2
;
425 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
426 wake_up(&mddev
->sb_wait
);
430 bio
->bi_private
= rdev
;
431 super_written(bio
, error
);
435 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
436 sector_t sector
, int size
, struct page
*page
)
438 /* write first size bytes of page to sector of rdev
439 * Increment mddev->pending_writes before returning
440 * and decrement it on completion, waking up sb_wait
441 * if zero is reached.
442 * If an error occurred, call md_error
444 * As we might need to resubmit the request if BIO_RW_BARRIER
445 * causes ENOTSUPP, we allocate a spare bio...
447 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
448 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
450 bio
->bi_bdev
= rdev
->bdev
;
451 bio
->bi_sector
= sector
;
452 bio_add_page(bio
, page
, size
, 0);
453 bio
->bi_private
= rdev
;
454 bio
->bi_end_io
= super_written
;
457 atomic_inc(&mddev
->pending_writes
);
458 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
460 rw
|= (1<<BIO_RW_BARRIER
);
461 rbio
= bio_clone(bio
, GFP_NOIO
);
462 rbio
->bi_private
= bio
;
463 rbio
->bi_end_io
= super_written_barrier
;
464 submit_bio(rw
, rbio
);
469 void md_super_wait(mddev_t
*mddev
)
471 /* wait for all superblock writes that were scheduled to complete.
472 * if any had to be retried (due to BARRIER problems), retry them
476 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
477 if (atomic_read(&mddev
->pending_writes
)==0)
479 while (mddev
->biolist
) {
481 spin_lock_irq(&mddev
->write_lock
);
482 bio
= mddev
->biolist
;
483 mddev
->biolist
= bio
->bi_next
;
485 spin_unlock_irq(&mddev
->write_lock
);
486 submit_bio(bio
->bi_rw
, bio
);
490 finish_wait(&mddev
->sb_wait
, &wq
);
493 static void bi_complete(struct bio
*bio
, int error
)
495 complete((struct completion
*)bio
->bi_private
);
498 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
499 struct page
*page
, int rw
)
501 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
502 struct completion event
;
505 rw
|= (1 << BIO_RW_SYNC
);
508 bio
->bi_sector
= sector
;
509 bio_add_page(bio
, page
, size
, 0);
510 init_completion(&event
);
511 bio
->bi_private
= &event
;
512 bio
->bi_end_io
= bi_complete
;
514 wait_for_completion(&event
);
516 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
520 EXPORT_SYMBOL_GPL(sync_page_io
);
522 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
524 char b
[BDEVNAME_SIZE
];
525 if (!rdev
->sb_page
) {
533 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
539 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
540 bdevname(rdev
->bdev
,b
));
544 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
546 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
547 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
548 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
549 (sb1
->set_uuid3
== sb2
->set_uuid3
))
557 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
560 mdp_super_t
*tmp1
, *tmp2
;
562 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
563 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
565 if (!tmp1
|| !tmp2
) {
567 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
575 * nr_disks is not constant
580 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
592 static u32
md_csum_fold(u32 csum
)
594 csum
= (csum
& 0xffff) + (csum
>> 16);
595 return (csum
& 0xffff) + (csum
>> 16);
598 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
601 u32
*sb32
= (u32
*)sb
;
603 unsigned int disk_csum
, csum
;
605 disk_csum
= sb
->sb_csum
;
608 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
610 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
614 /* This used to use csum_partial, which was wrong for several
615 * reasons including that different results are returned on
616 * different architectures. It isn't critical that we get exactly
617 * the same return value as before (we always csum_fold before
618 * testing, and that removes any differences). However as we
619 * know that csum_partial always returned a 16bit value on
620 * alphas, do a fold to maximise conformity to previous behaviour.
622 sb
->sb_csum
= md_csum_fold(disk_csum
);
624 sb
->sb_csum
= disk_csum
;
631 * Handle superblock details.
632 * We want to be able to handle multiple superblock formats
633 * so we have a common interface to them all, and an array of
634 * different handlers.
635 * We rely on user-space to write the initial superblock, and support
636 * reading and updating of superblocks.
637 * Interface methods are:
638 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
639 * loads and validates a superblock on dev.
640 * if refdev != NULL, compare superblocks on both devices
642 * 0 - dev has a superblock that is compatible with refdev
643 * 1 - dev has a superblock that is compatible and newer than refdev
644 * so dev should be used as the refdev in future
645 * -EINVAL superblock incompatible or invalid
646 * -othererror e.g. -EIO
648 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
649 * Verify that dev is acceptable into mddev.
650 * The first time, mddev->raid_disks will be 0, and data from
651 * dev should be merged in. Subsequent calls check that dev
652 * is new enough. Return 0 or -EINVAL
654 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
655 * Update the superblock for rdev with data in mddev
656 * This does not write to disc.
662 struct module
*owner
;
663 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
665 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
666 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
667 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
668 unsigned long long size
);
672 * load_super for 0.90.0
674 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
676 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
682 * Calculate the position of the superblock,
683 * it's at the end of the disk.
685 * It also happens to be a multiple of 4Kb.
687 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
688 rdev
->sb_offset
= sb_offset
;
690 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
695 bdevname(rdev
->bdev
, b
);
696 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
698 if (sb
->md_magic
!= MD_SB_MAGIC
) {
699 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
704 if (sb
->major_version
!= 0 ||
705 sb
->minor_version
< 90 ||
706 sb
->minor_version
> 91) {
707 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
708 sb
->major_version
, sb
->minor_version
,
713 if (sb
->raid_disks
<= 0)
716 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
717 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
722 rdev
->preferred_minor
= sb
->md_minor
;
723 rdev
->data_offset
= 0;
724 rdev
->sb_size
= MD_SB_BYTES
;
726 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
727 if (sb
->level
!= 1 && sb
->level
!= 4
728 && sb
->level
!= 5 && sb
->level
!= 6
729 && sb
->level
!= 10) {
730 /* FIXME use a better test */
732 "md: bitmaps not supported for this level.\n");
737 if (sb
->level
== LEVEL_MULTIPATH
)
740 rdev
->desc_nr
= sb
->this_disk
.number
;
746 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
747 if (!uuid_equal(refsb
, sb
)) {
748 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
749 b
, bdevname(refdev
->bdev
,b2
));
752 if (!sb_equal(refsb
, sb
)) {
753 printk(KERN_WARNING
"md: %s has same UUID"
754 " but different superblock to %s\n",
755 b
, bdevname(refdev
->bdev
, b2
));
759 ev2
= md_event(refsb
);
765 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
767 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
768 /* "this cannot possibly happen" ... */
776 * validate_super for 0.90.0
778 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
781 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
782 __u64 ev1
= md_event(sb
);
784 rdev
->raid_disk
= -1;
785 clear_bit(Faulty
, &rdev
->flags
);
786 clear_bit(In_sync
, &rdev
->flags
);
787 clear_bit(WriteMostly
, &rdev
->flags
);
788 clear_bit(BarriersNotsupp
, &rdev
->flags
);
790 if (mddev
->raid_disks
== 0) {
791 mddev
->major_version
= 0;
792 mddev
->minor_version
= sb
->minor_version
;
793 mddev
->patch_version
= sb
->patch_version
;
795 mddev
->chunk_size
= sb
->chunk_size
;
796 mddev
->ctime
= sb
->ctime
;
797 mddev
->utime
= sb
->utime
;
798 mddev
->level
= sb
->level
;
799 mddev
->clevel
[0] = 0;
800 mddev
->layout
= sb
->layout
;
801 mddev
->raid_disks
= sb
->raid_disks
;
802 mddev
->size
= sb
->size
;
804 mddev
->bitmap_offset
= 0;
805 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
807 if (mddev
->minor_version
>= 91) {
808 mddev
->reshape_position
= sb
->reshape_position
;
809 mddev
->delta_disks
= sb
->delta_disks
;
810 mddev
->new_level
= sb
->new_level
;
811 mddev
->new_layout
= sb
->new_layout
;
812 mddev
->new_chunk
= sb
->new_chunk
;
814 mddev
->reshape_position
= MaxSector
;
815 mddev
->delta_disks
= 0;
816 mddev
->new_level
= mddev
->level
;
817 mddev
->new_layout
= mddev
->layout
;
818 mddev
->new_chunk
= mddev
->chunk_size
;
821 if (sb
->state
& (1<<MD_SB_CLEAN
))
822 mddev
->recovery_cp
= MaxSector
;
824 if (sb
->events_hi
== sb
->cp_events_hi
&&
825 sb
->events_lo
== sb
->cp_events_lo
) {
826 mddev
->recovery_cp
= sb
->recovery_cp
;
828 mddev
->recovery_cp
= 0;
831 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
832 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
833 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
834 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
836 mddev
->max_disks
= MD_SB_DISKS
;
838 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
839 mddev
->bitmap_file
== NULL
)
840 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
842 } else if (mddev
->pers
== NULL
) {
843 /* Insist on good event counter while assembling */
845 if (ev1
< mddev
->events
)
847 } else if (mddev
->bitmap
) {
848 /* if adding to array with a bitmap, then we can accept an
849 * older device ... but not too old.
851 if (ev1
< mddev
->bitmap
->events_cleared
)
854 if (ev1
< mddev
->events
)
855 /* just a hot-add of a new device, leave raid_disk at -1 */
859 if (mddev
->level
!= LEVEL_MULTIPATH
) {
860 desc
= sb
->disks
+ rdev
->desc_nr
;
862 if (desc
->state
& (1<<MD_DISK_FAULTY
))
863 set_bit(Faulty
, &rdev
->flags
);
864 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
865 desc->raid_disk < mddev->raid_disks */) {
866 set_bit(In_sync
, &rdev
->flags
);
867 rdev
->raid_disk
= desc
->raid_disk
;
869 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
870 set_bit(WriteMostly
, &rdev
->flags
);
871 } else /* MULTIPATH are always insync */
872 set_bit(In_sync
, &rdev
->flags
);
877 * sync_super for 0.90.0
879 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
882 struct list_head
*tmp
;
884 int next_spare
= mddev
->raid_disks
;
887 /* make rdev->sb match mddev data..
890 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
891 * 3/ any empty disks < next_spare become removed
893 * disks[0] gets initialised to REMOVED because
894 * we cannot be sure from other fields if it has
895 * been initialised or not.
898 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
900 rdev
->sb_size
= MD_SB_BYTES
;
902 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
904 memset(sb
, 0, sizeof(*sb
));
906 sb
->md_magic
= MD_SB_MAGIC
;
907 sb
->major_version
= mddev
->major_version
;
908 sb
->patch_version
= mddev
->patch_version
;
909 sb
->gvalid_words
= 0; /* ignored */
910 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
911 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
912 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
913 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
915 sb
->ctime
= mddev
->ctime
;
916 sb
->level
= mddev
->level
;
917 sb
->size
= mddev
->size
;
918 sb
->raid_disks
= mddev
->raid_disks
;
919 sb
->md_minor
= mddev
->md_minor
;
920 sb
->not_persistent
= 0;
921 sb
->utime
= mddev
->utime
;
923 sb
->events_hi
= (mddev
->events
>>32);
924 sb
->events_lo
= (u32
)mddev
->events
;
926 if (mddev
->reshape_position
== MaxSector
)
927 sb
->minor_version
= 90;
929 sb
->minor_version
= 91;
930 sb
->reshape_position
= mddev
->reshape_position
;
931 sb
->new_level
= mddev
->new_level
;
932 sb
->delta_disks
= mddev
->delta_disks
;
933 sb
->new_layout
= mddev
->new_layout
;
934 sb
->new_chunk
= mddev
->new_chunk
;
936 mddev
->minor_version
= sb
->minor_version
;
939 sb
->recovery_cp
= mddev
->recovery_cp
;
940 sb
->cp_events_hi
= (mddev
->events
>>32);
941 sb
->cp_events_lo
= (u32
)mddev
->events
;
942 if (mddev
->recovery_cp
== MaxSector
)
943 sb
->state
= (1<< MD_SB_CLEAN
);
947 sb
->layout
= mddev
->layout
;
948 sb
->chunk_size
= mddev
->chunk_size
;
950 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
951 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
953 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
954 rdev_for_each(rdev2
, tmp
, mddev
) {
957 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
958 && !test_bit(Faulty
, &rdev2
->flags
))
959 desc_nr
= rdev2
->raid_disk
;
961 desc_nr
= next_spare
++;
962 rdev2
->desc_nr
= desc_nr
;
963 d
= &sb
->disks
[rdev2
->desc_nr
];
965 d
->number
= rdev2
->desc_nr
;
966 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
967 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
968 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
969 && !test_bit(Faulty
, &rdev2
->flags
))
970 d
->raid_disk
= rdev2
->raid_disk
;
972 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
973 if (test_bit(Faulty
, &rdev2
->flags
))
974 d
->state
= (1<<MD_DISK_FAULTY
);
975 else if (test_bit(In_sync
, &rdev2
->flags
)) {
976 d
->state
= (1<<MD_DISK_ACTIVE
);
977 d
->state
|= (1<<MD_DISK_SYNC
);
985 if (test_bit(WriteMostly
, &rdev2
->flags
))
986 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
988 /* now set the "removed" and "faulty" bits on any missing devices */
989 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
990 mdp_disk_t
*d
= &sb
->disks
[i
];
991 if (d
->state
== 0 && d
->number
== 0) {
994 d
->state
= (1<<MD_DISK_REMOVED
);
995 d
->state
|= (1<<MD_DISK_FAULTY
);
999 sb
->nr_disks
= nr_disks
;
1000 sb
->active_disks
= active
;
1001 sb
->working_disks
= working
;
1002 sb
->failed_disks
= failed
;
1003 sb
->spare_disks
= spare
;
1005 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1006 sb
->sb_csum
= calc_sb_csum(sb
);
1010 * rdev_size_change for 0.90.0
1012 static unsigned long long
1013 super_90_rdev_size_change(mdk_rdev_t
*rdev
, unsigned long long size
)
1015 if (size
&& size
< rdev
->mddev
->size
)
1016 return 0; /* component must fit device */
1017 size
*= 2; /* convert to sectors */
1018 if (rdev
->mddev
->bitmap_offset
)
1019 return 0; /* can't move bitmap */
1020 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
1021 if (!size
|| size
> rdev
->sb_offset
*2)
1022 size
= rdev
->sb_offset
*2;
1023 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_offset
<< 1, rdev
->sb_size
,
1025 md_super_wait(rdev
->mddev
);
1026 return size
/2; /* kB for sysfs */
1031 * version 1 superblock
1034 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1038 unsigned long long newcsum
;
1039 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1040 __le32
*isuper
= (__le32
*)sb
;
1043 disk_csum
= sb
->sb_csum
;
1046 for (i
=0; size
>=4; size
-= 4 )
1047 newcsum
+= le32_to_cpu(*isuper
++);
1050 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1052 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1053 sb
->sb_csum
= disk_csum
;
1054 return cpu_to_le32(csum
);
1057 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1059 struct mdp_superblock_1
*sb
;
1062 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1066 * Calculate the position of the superblock.
1067 * It is always aligned to a 4K boundary and
1068 * depeding on minor_version, it can be:
1069 * 0: At least 8K, but less than 12K, from end of device
1070 * 1: At start of device
1071 * 2: 4K from start of device.
1073 switch(minor_version
) {
1075 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1077 sb_offset
&= ~(sector_t
)(4*2-1);
1078 /* convert from sectors to K */
1090 rdev
->sb_offset
= sb_offset
;
1092 /* superblock is rarely larger than 1K, but it can be larger,
1093 * and it is safe to read 4k, so we do that
1095 ret
= read_disk_sb(rdev
, 4096);
1096 if (ret
) return ret
;
1099 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1101 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1102 sb
->major_version
!= cpu_to_le32(1) ||
1103 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1104 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1105 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1108 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1109 printk("md: invalid superblock checksum on %s\n",
1110 bdevname(rdev
->bdev
,b
));
1113 if (le64_to_cpu(sb
->data_size
) < 10) {
1114 printk("md: data_size too small on %s\n",
1115 bdevname(rdev
->bdev
,b
));
1118 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1119 if (sb
->level
!= cpu_to_le32(1) &&
1120 sb
->level
!= cpu_to_le32(4) &&
1121 sb
->level
!= cpu_to_le32(5) &&
1122 sb
->level
!= cpu_to_le32(6) &&
1123 sb
->level
!= cpu_to_le32(10)) {
1125 "md: bitmaps not supported for this level.\n");
1130 rdev
->preferred_minor
= 0xffff;
1131 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1132 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1134 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1135 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1136 if (rdev
->sb_size
& bmask
)
1137 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1140 && rdev
->data_offset
< sb_offset
+ (rdev
->sb_size
/512))
1143 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1146 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1152 struct mdp_superblock_1
*refsb
=
1153 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1155 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1156 sb
->level
!= refsb
->level
||
1157 sb
->layout
!= refsb
->layout
||
1158 sb
->chunksize
!= refsb
->chunksize
) {
1159 printk(KERN_WARNING
"md: %s has strangely different"
1160 " superblock to %s\n",
1161 bdevname(rdev
->bdev
,b
),
1162 bdevname(refdev
->bdev
,b2
));
1165 ev1
= le64_to_cpu(sb
->events
);
1166 ev2
= le64_to_cpu(refsb
->events
);
1174 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1176 rdev
->size
= rdev
->sb_offset
;
1177 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1179 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1180 if (le32_to_cpu(sb
->chunksize
))
1181 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1183 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1188 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1190 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1191 __u64 ev1
= le64_to_cpu(sb
->events
);
1193 rdev
->raid_disk
= -1;
1194 clear_bit(Faulty
, &rdev
->flags
);
1195 clear_bit(In_sync
, &rdev
->flags
);
1196 clear_bit(WriteMostly
, &rdev
->flags
);
1197 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1199 if (mddev
->raid_disks
== 0) {
1200 mddev
->major_version
= 1;
1201 mddev
->patch_version
= 0;
1202 mddev
->external
= 0;
1203 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1204 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1205 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1206 mddev
->level
= le32_to_cpu(sb
->level
);
1207 mddev
->clevel
[0] = 0;
1208 mddev
->layout
= le32_to_cpu(sb
->layout
);
1209 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1210 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1211 mddev
->events
= ev1
;
1212 mddev
->bitmap_offset
= 0;
1213 mddev
->default_bitmap_offset
= 1024 >> 9;
1215 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1216 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1218 mddev
->max_disks
= (4096-256)/2;
1220 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1221 mddev
->bitmap_file
== NULL
)
1222 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1224 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1225 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1226 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1227 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1228 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1229 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1231 mddev
->reshape_position
= MaxSector
;
1232 mddev
->delta_disks
= 0;
1233 mddev
->new_level
= mddev
->level
;
1234 mddev
->new_layout
= mddev
->layout
;
1235 mddev
->new_chunk
= mddev
->chunk_size
;
1238 } else if (mddev
->pers
== NULL
) {
1239 /* Insist of good event counter while assembling */
1241 if (ev1
< mddev
->events
)
1243 } else if (mddev
->bitmap
) {
1244 /* If adding to array with a bitmap, then we can accept an
1245 * older device, but not too old.
1247 if (ev1
< mddev
->bitmap
->events_cleared
)
1250 if (ev1
< mddev
->events
)
1251 /* just a hot-add of a new device, leave raid_disk at -1 */
1254 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1256 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1258 case 0xffff: /* spare */
1260 case 0xfffe: /* faulty */
1261 set_bit(Faulty
, &rdev
->flags
);
1264 if ((le32_to_cpu(sb
->feature_map
) &
1265 MD_FEATURE_RECOVERY_OFFSET
))
1266 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1268 set_bit(In_sync
, &rdev
->flags
);
1269 rdev
->raid_disk
= role
;
1272 if (sb
->devflags
& WriteMostly1
)
1273 set_bit(WriteMostly
, &rdev
->flags
);
1274 } else /* MULTIPATH are always insync */
1275 set_bit(In_sync
, &rdev
->flags
);
1280 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1282 struct mdp_superblock_1
*sb
;
1283 struct list_head
*tmp
;
1286 /* make rdev->sb match mddev and rdev data. */
1288 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1290 sb
->feature_map
= 0;
1292 sb
->recovery_offset
= cpu_to_le64(0);
1293 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1294 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1295 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1297 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1298 sb
->events
= cpu_to_le64(mddev
->events
);
1300 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1302 sb
->resync_offset
= cpu_to_le64(0);
1304 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1306 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1307 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1309 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1310 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1311 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1314 if (rdev
->raid_disk
>= 0 &&
1315 !test_bit(In_sync
, &rdev
->flags
) &&
1316 rdev
->recovery_offset
> 0) {
1317 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1318 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1321 if (mddev
->reshape_position
!= MaxSector
) {
1322 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1323 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1324 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1325 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1326 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1327 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1331 rdev_for_each(rdev2
, tmp
, mddev
)
1332 if (rdev2
->desc_nr
+1 > max_dev
)
1333 max_dev
= rdev2
->desc_nr
+1;
1335 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1336 sb
->max_dev
= cpu_to_le32(max_dev
);
1337 for (i
=0; i
<max_dev
;i
++)
1338 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1340 rdev_for_each(rdev2
, tmp
, mddev
) {
1342 if (test_bit(Faulty
, &rdev2
->flags
))
1343 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1344 else if (test_bit(In_sync
, &rdev2
->flags
))
1345 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1346 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1347 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1349 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1352 sb
->sb_csum
= calc_sb_1_csum(sb
);
1355 static unsigned long long
1356 super_1_rdev_size_change(mdk_rdev_t
*rdev
, unsigned long long size
)
1358 struct mdp_superblock_1
*sb
;
1359 unsigned long long max_size
;
1360 if (size
&& size
< rdev
->mddev
->size
)
1361 return 0; /* component must fit device */
1362 size
*= 2; /* convert to sectors */
1363 if (rdev
->sb_offset
< rdev
->data_offset
/2) {
1364 /* minor versions 1 and 2; superblock before data */
1365 max_size
= (rdev
->bdev
->bd_inode
->i_size
>> 9);
1366 max_size
-= rdev
->data_offset
;
1367 if (!size
|| size
> max_size
)
1369 } else if (rdev
->mddev
->bitmap_offset
) {
1370 /* minor version 0 with bitmap we can't move */
1373 /* minor version 0; superblock after data */
1375 sb_offset
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1376 sb_offset
&= ~(sector_t
)(4*2 - 1);
1377 max_size
= rdev
->size
*2 + sb_offset
- rdev
->sb_offset
*2;
1378 if (!size
|| size
> max_size
)
1380 rdev
->sb_offset
= sb_offset
/2;
1382 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1383 sb
->data_size
= cpu_to_le64(size
);
1384 sb
->super_offset
= rdev
->sb_offset
*2;
1385 sb
->sb_csum
= calc_sb_1_csum(sb
);
1386 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_offset
<< 1, rdev
->sb_size
,
1388 md_super_wait(rdev
->mddev
);
1389 return size
/2; /* kB for sysfs */
1392 static struct super_type super_types
[] = {
1395 .owner
= THIS_MODULE
,
1396 .load_super
= super_90_load
,
1397 .validate_super
= super_90_validate
,
1398 .sync_super
= super_90_sync
,
1399 .rdev_size_change
= super_90_rdev_size_change
,
1403 .owner
= THIS_MODULE
,
1404 .load_super
= super_1_load
,
1405 .validate_super
= super_1_validate
,
1406 .sync_super
= super_1_sync
,
1407 .rdev_size_change
= super_1_rdev_size_change
,
1411 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1413 struct list_head
*tmp
, *tmp2
;
1414 mdk_rdev_t
*rdev
, *rdev2
;
1416 rdev_for_each(rdev
, tmp
, mddev1
)
1417 rdev_for_each(rdev2
, tmp2
, mddev2
)
1418 if (rdev
->bdev
->bd_contains
==
1419 rdev2
->bdev
->bd_contains
)
1425 static LIST_HEAD(pending_raid_disks
);
1427 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1429 char b
[BDEVNAME_SIZE
];
1439 /* prevent duplicates */
1440 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1443 /* make sure rdev->size exceeds mddev->size */
1444 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1446 /* Cannot change size, so fail
1447 * If mddev->level <= 0, then we don't care
1448 * about aligning sizes (e.g. linear)
1450 if (mddev
->level
> 0)
1453 mddev
->size
= rdev
->size
;
1456 /* Verify rdev->desc_nr is unique.
1457 * If it is -1, assign a free number, else
1458 * check number is not in use
1460 if (rdev
->desc_nr
< 0) {
1462 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1463 while (find_rdev_nr(mddev
, choice
))
1465 rdev
->desc_nr
= choice
;
1467 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1470 bdevname(rdev
->bdev
,b
);
1471 while ( (s
=strchr(b
, '/')) != NULL
)
1474 rdev
->mddev
= mddev
;
1475 printk(KERN_INFO
"md: bind<%s>\n", b
);
1477 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1480 if (rdev
->bdev
->bd_part
)
1481 ko
= &rdev
->bdev
->bd_part
->dev
.kobj
;
1483 ko
= &rdev
->bdev
->bd_disk
->dev
.kobj
;
1484 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1485 kobject_del(&rdev
->kobj
);
1488 list_add(&rdev
->same_set
, &mddev
->disks
);
1489 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1493 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1498 static void md_delayed_delete(struct work_struct
*ws
)
1500 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1501 kobject_del(&rdev
->kobj
);
1502 kobject_put(&rdev
->kobj
);
1505 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1507 char b
[BDEVNAME_SIZE
];
1512 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1513 list_del_init(&rdev
->same_set
);
1514 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1516 sysfs_remove_link(&rdev
->kobj
, "block");
1518 /* We need to delay this, otherwise we can deadlock when
1519 * writing to 'remove' to "dev/state"
1521 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1522 kobject_get(&rdev
->kobj
);
1523 schedule_work(&rdev
->del_work
);
1527 * prevent the device from being mounted, repartitioned or
1528 * otherwise reused by a RAID array (or any other kernel
1529 * subsystem), by bd_claiming the device.
1531 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1534 struct block_device
*bdev
;
1535 char b
[BDEVNAME_SIZE
];
1537 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1539 printk(KERN_ERR
"md: could not open %s.\n",
1540 __bdevname(dev
, b
));
1541 return PTR_ERR(bdev
);
1543 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1545 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1551 set_bit(AllReserved
, &rdev
->flags
);
1556 static void unlock_rdev(mdk_rdev_t
*rdev
)
1558 struct block_device
*bdev
= rdev
->bdev
;
1566 void md_autodetect_dev(dev_t dev
);
1568 static void export_rdev(mdk_rdev_t
* rdev
)
1570 char b
[BDEVNAME_SIZE
];
1571 printk(KERN_INFO
"md: export_rdev(%s)\n",
1572 bdevname(rdev
->bdev
,b
));
1576 list_del_init(&rdev
->same_set
);
1578 if (test_bit(AutoDetected
, &rdev
->flags
))
1579 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1582 kobject_put(&rdev
->kobj
);
1585 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1587 unbind_rdev_from_array(rdev
);
1591 static void export_array(mddev_t
*mddev
)
1593 struct list_head
*tmp
;
1596 rdev_for_each(rdev
, tmp
, mddev
) {
1601 kick_rdev_from_array(rdev
);
1603 if (!list_empty(&mddev
->disks
))
1605 mddev
->raid_disks
= 0;
1606 mddev
->major_version
= 0;
1609 static void print_desc(mdp_disk_t
*desc
)
1611 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1612 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1615 static void print_sb(mdp_super_t
*sb
)
1620 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1621 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1622 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1624 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1625 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1626 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1627 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1628 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1629 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1630 sb
->failed_disks
, sb
->spare_disks
,
1631 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1634 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1637 desc
= sb
->disks
+ i
;
1638 if (desc
->number
|| desc
->major
|| desc
->minor
||
1639 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1640 printk(" D %2d: ", i
);
1644 printk(KERN_INFO
"md: THIS: ");
1645 print_desc(&sb
->this_disk
);
1649 static void print_rdev(mdk_rdev_t
*rdev
)
1651 char b
[BDEVNAME_SIZE
];
1652 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1653 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1654 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1656 if (rdev
->sb_loaded
) {
1657 printk(KERN_INFO
"md: rdev superblock:\n");
1658 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1660 printk(KERN_INFO
"md: no rdev superblock!\n");
1663 static void md_print_devices(void)
1665 struct list_head
*tmp
, *tmp2
;
1668 char b
[BDEVNAME_SIZE
];
1671 printk("md: **********************************\n");
1672 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1673 printk("md: **********************************\n");
1674 for_each_mddev(mddev
, tmp
) {
1677 bitmap_print_sb(mddev
->bitmap
);
1679 printk("%s: ", mdname(mddev
));
1680 rdev_for_each(rdev
, tmp2
, mddev
)
1681 printk("<%s>", bdevname(rdev
->bdev
,b
));
1684 rdev_for_each(rdev
, tmp2
, mddev
)
1687 printk("md: **********************************\n");
1692 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1694 /* Update each superblock (in-memory image), but
1695 * if we are allowed to, skip spares which already
1696 * have the right event counter, or have one earlier
1697 * (which would mean they aren't being marked as dirty
1698 * with the rest of the array)
1701 struct list_head
*tmp
;
1703 rdev_for_each(rdev
, tmp
, mddev
) {
1704 if (rdev
->sb_events
== mddev
->events
||
1706 rdev
->raid_disk
< 0 &&
1707 (rdev
->sb_events
&1)==0 &&
1708 rdev
->sb_events
+1 == mddev
->events
)) {
1709 /* Don't update this superblock */
1710 rdev
->sb_loaded
= 2;
1712 super_types
[mddev
->major_version
].
1713 sync_super(mddev
, rdev
);
1714 rdev
->sb_loaded
= 1;
1719 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1721 struct list_head
*tmp
;
1726 if (mddev
->external
)
1729 spin_lock_irq(&mddev
->write_lock
);
1731 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1732 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1734 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1735 /* just a clean<-> dirty transition, possibly leave spares alone,
1736 * though if events isn't the right even/odd, we will have to do
1742 if (mddev
->degraded
)
1743 /* If the array is degraded, then skipping spares is both
1744 * dangerous and fairly pointless.
1745 * Dangerous because a device that was removed from the array
1746 * might have a event_count that still looks up-to-date,
1747 * so it can be re-added without a resync.
1748 * Pointless because if there are any spares to skip,
1749 * then a recovery will happen and soon that array won't
1750 * be degraded any more and the spare can go back to sleep then.
1754 sync_req
= mddev
->in_sync
;
1755 mddev
->utime
= get_seconds();
1757 /* If this is just a dirty<->clean transition, and the array is clean
1758 * and 'events' is odd, we can roll back to the previous clean state */
1760 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1761 && (mddev
->events
& 1)
1762 && mddev
->events
!= 1)
1765 /* otherwise we have to go forward and ... */
1767 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1768 /* .. if the array isn't clean, insist on an odd 'events' */
1769 if ((mddev
->events
&1)==0) {
1774 /* otherwise insist on an even 'events' (for clean states) */
1775 if ((mddev
->events
&1)) {
1782 if (!mddev
->events
) {
1784 * oops, this 64-bit counter should never wrap.
1785 * Either we are in around ~1 trillion A.C., assuming
1786 * 1 reboot per second, or we have a bug:
1793 * do not write anything to disk if using
1794 * nonpersistent superblocks
1796 if (!mddev
->persistent
) {
1797 if (!mddev
->external
)
1798 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1800 spin_unlock_irq(&mddev
->write_lock
);
1801 wake_up(&mddev
->sb_wait
);
1804 sync_sbs(mddev
, nospares
);
1805 spin_unlock_irq(&mddev
->write_lock
);
1808 "md: updating %s RAID superblock on device (in sync %d)\n",
1809 mdname(mddev
),mddev
->in_sync
);
1811 bitmap_update_sb(mddev
->bitmap
);
1812 rdev_for_each(rdev
, tmp
, mddev
) {
1813 char b
[BDEVNAME_SIZE
];
1814 dprintk(KERN_INFO
"md: ");
1815 if (rdev
->sb_loaded
!= 1)
1816 continue; /* no noise on spare devices */
1817 if (test_bit(Faulty
, &rdev
->flags
))
1818 dprintk("(skipping faulty ");
1820 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1821 if (!test_bit(Faulty
, &rdev
->flags
)) {
1822 md_super_write(mddev
,rdev
,
1823 rdev
->sb_offset
<<1, rdev
->sb_size
,
1825 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1826 bdevname(rdev
->bdev
,b
),
1827 (unsigned long long)rdev
->sb_offset
);
1828 rdev
->sb_events
= mddev
->events
;
1832 if (mddev
->level
== LEVEL_MULTIPATH
)
1833 /* only need to write one superblock... */
1836 md_super_wait(mddev
);
1837 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1839 spin_lock_irq(&mddev
->write_lock
);
1840 if (mddev
->in_sync
!= sync_req
||
1841 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1842 /* have to write it out again */
1843 spin_unlock_irq(&mddev
->write_lock
);
1846 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1847 spin_unlock_irq(&mddev
->write_lock
);
1848 wake_up(&mddev
->sb_wait
);
1852 /* words written to sysfs files may, or my not, be \n terminated.
1853 * We want to accept with case. For this we use cmd_match.
1855 static int cmd_match(const char *cmd
, const char *str
)
1857 /* See if cmd, written into a sysfs file, matches
1858 * str. They must either be the same, or cmd can
1859 * have a trailing newline
1861 while (*cmd
&& *str
&& *cmd
== *str
) {
1872 struct rdev_sysfs_entry
{
1873 struct attribute attr
;
1874 ssize_t (*show
)(mdk_rdev_t
*, char *);
1875 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1879 state_show(mdk_rdev_t
*rdev
, char *page
)
1884 if (test_bit(Faulty
, &rdev
->flags
)) {
1885 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1888 if (test_bit(In_sync
, &rdev
->flags
)) {
1889 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1892 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1893 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1896 if (test_bit(Blocked
, &rdev
->flags
)) {
1897 len
+= sprintf(page
+len
, "%sblocked", sep
);
1900 if (!test_bit(Faulty
, &rdev
->flags
) &&
1901 !test_bit(In_sync
, &rdev
->flags
)) {
1902 len
+= sprintf(page
+len
, "%sspare", sep
);
1905 return len
+sprintf(page
+len
, "\n");
1909 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1912 * faulty - simulates and error
1913 * remove - disconnects the device
1914 * writemostly - sets write_mostly
1915 * -writemostly - clears write_mostly
1916 * blocked - sets the Blocked flag
1917 * -blocked - clears the Blocked flag
1920 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1921 md_error(rdev
->mddev
, rdev
);
1923 } else if (cmd_match(buf
, "remove")) {
1924 if (rdev
->raid_disk
>= 0)
1927 mddev_t
*mddev
= rdev
->mddev
;
1928 kick_rdev_from_array(rdev
);
1930 md_update_sb(mddev
, 1);
1931 md_new_event(mddev
);
1934 } else if (cmd_match(buf
, "writemostly")) {
1935 set_bit(WriteMostly
, &rdev
->flags
);
1937 } else if (cmd_match(buf
, "-writemostly")) {
1938 clear_bit(WriteMostly
, &rdev
->flags
);
1940 } else if (cmd_match(buf
, "blocked")) {
1941 set_bit(Blocked
, &rdev
->flags
);
1943 } else if (cmd_match(buf
, "-blocked")) {
1944 clear_bit(Blocked
, &rdev
->flags
);
1945 wake_up(&rdev
->blocked_wait
);
1946 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1947 md_wakeup_thread(rdev
->mddev
->thread
);
1952 sysfs_notify(&rdev
->kobj
, NULL
, "state");
1953 return err
? err
: len
;
1955 static struct rdev_sysfs_entry rdev_state
=
1956 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1959 errors_show(mdk_rdev_t
*rdev
, char *page
)
1961 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1965 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1968 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1969 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1970 atomic_set(&rdev
->corrected_errors
, n
);
1975 static struct rdev_sysfs_entry rdev_errors
=
1976 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1979 slot_show(mdk_rdev_t
*rdev
, char *page
)
1981 if (rdev
->raid_disk
< 0)
1982 return sprintf(page
, "none\n");
1984 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1988 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1993 int slot
= simple_strtoul(buf
, &e
, 10);
1994 if (strncmp(buf
, "none", 4)==0)
1996 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1998 if (rdev
->mddev
->pers
&& slot
== -1) {
1999 /* Setting 'slot' on an active array requires also
2000 * updating the 'rd%d' link, and communicating
2001 * with the personality with ->hot_*_disk.
2002 * For now we only support removing
2003 * failed/spare devices. This normally happens automatically,
2004 * but not when the metadata is externally managed.
2006 if (rdev
->raid_disk
== -1)
2008 /* personality does all needed checks */
2009 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2011 err
= rdev
->mddev
->pers
->
2012 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2015 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2016 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2017 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2018 md_wakeup_thread(rdev
->mddev
->thread
);
2019 } else if (rdev
->mddev
->pers
) {
2021 struct list_head
*tmp
;
2022 /* Activating a spare .. or possibly reactivating
2023 * if we every get bitmaps working here.
2026 if (rdev
->raid_disk
!= -1)
2029 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2032 rdev_for_each(rdev2
, tmp
, rdev
->mddev
)
2033 if (rdev2
->raid_disk
== slot
)
2036 rdev
->raid_disk
= slot
;
2037 if (test_bit(In_sync
, &rdev
->flags
))
2038 rdev
->saved_raid_disk
= slot
;
2040 rdev
->saved_raid_disk
= -1;
2041 err
= rdev
->mddev
->pers
->
2042 hot_add_disk(rdev
->mddev
, rdev
);
2044 rdev
->raid_disk
= -1;
2047 sysfs_notify(&rdev
->kobj
, NULL
, "state");
2048 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2049 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2051 "md: cannot register "
2053 nm
, mdname(rdev
->mddev
));
2055 /* don't wakeup anyone, leave that to userspace. */
2057 if (slot
>= rdev
->mddev
->raid_disks
)
2059 rdev
->raid_disk
= slot
;
2060 /* assume it is working */
2061 clear_bit(Faulty
, &rdev
->flags
);
2062 clear_bit(WriteMostly
, &rdev
->flags
);
2063 set_bit(In_sync
, &rdev
->flags
);
2064 sysfs_notify(&rdev
->kobj
, NULL
, "state");
2070 static struct rdev_sysfs_entry rdev_slot
=
2071 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2074 offset_show(mdk_rdev_t
*rdev
, char *page
)
2076 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2080 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2083 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2084 if (e
==buf
|| (*e
&& *e
!= '\n'))
2086 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2088 if (rdev
->size
&& rdev
->mddev
->external
)
2089 /* Must set offset before size, so overlap checks
2092 rdev
->data_offset
= offset
;
2096 static struct rdev_sysfs_entry rdev_offset
=
2097 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2100 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2102 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
2105 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2107 /* check if two start/length pairs overlap */
2116 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2119 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2120 unsigned long long oldsize
= rdev
->size
;
2121 mddev_t
*my_mddev
= rdev
->mddev
;
2123 if (e
==buf
|| (*e
&& *e
!= '\n'))
2125 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2126 if (rdev
->mddev
->persistent
) {
2127 size
= super_types
[rdev
->mddev
->major_version
].
2128 rdev_size_change(rdev
, size
);
2132 size
= (rdev
->bdev
->bd_inode
->i_size
>> 10);
2133 size
-= rdev
->data_offset
/2;
2135 if (size
< rdev
->mddev
->size
)
2136 return -EINVAL
; /* component must fit device */
2140 if (size
> oldsize
&& rdev
->mddev
->external
) {
2141 /* need to check that all other rdevs with the same ->bdev
2142 * do not overlap. We need to unlock the mddev to avoid
2143 * a deadlock. We have already changed rdev->size, and if
2144 * we have to change it back, we will have the lock again.
2148 struct list_head
*tmp
, *tmp2
;
2150 mddev_unlock(my_mddev
);
2151 for_each_mddev(mddev
, tmp
) {
2155 rdev_for_each(rdev2
, tmp2
, mddev
)
2156 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2157 (rdev
->bdev
== rdev2
->bdev
&&
2159 overlaps(rdev
->data_offset
, rdev
->size
,
2160 rdev2
->data_offset
, rdev2
->size
))) {
2164 mddev_unlock(mddev
);
2170 mddev_lock(my_mddev
);
2172 /* Someone else could have slipped in a size
2173 * change here, but doing so is just silly.
2174 * We put oldsize back because we *know* it is
2175 * safe, and trust userspace not to race with
2178 rdev
->size
= oldsize
;
2182 if (size
< my_mddev
->size
|| my_mddev
->size
== 0)
2183 my_mddev
->size
= size
;
2187 static struct rdev_sysfs_entry rdev_size
=
2188 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2190 static struct attribute
*rdev_default_attrs
[] = {
2199 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2201 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2202 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2203 mddev_t
*mddev
= rdev
->mddev
;
2209 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2211 if (rdev
->mddev
== NULL
)
2214 rv
= entry
->show(rdev
, page
);
2215 mddev_unlock(mddev
);
2221 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2222 const char *page
, size_t length
)
2224 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2225 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2227 mddev_t
*mddev
= rdev
->mddev
;
2231 if (!capable(CAP_SYS_ADMIN
))
2233 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2235 if (rdev
->mddev
== NULL
)
2238 rv
= entry
->store(rdev
, page
, length
);
2239 mddev_unlock(mddev
);
2244 static void rdev_free(struct kobject
*ko
)
2246 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2249 static struct sysfs_ops rdev_sysfs_ops
= {
2250 .show
= rdev_attr_show
,
2251 .store
= rdev_attr_store
,
2253 static struct kobj_type rdev_ktype
= {
2254 .release
= rdev_free
,
2255 .sysfs_ops
= &rdev_sysfs_ops
,
2256 .default_attrs
= rdev_default_attrs
,
2260 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2262 * mark the device faulty if:
2264 * - the device is nonexistent (zero size)
2265 * - the device has no valid superblock
2267 * a faulty rdev _never_ has rdev->sb set.
2269 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2271 char b
[BDEVNAME_SIZE
];
2276 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2278 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2279 return ERR_PTR(-ENOMEM
);
2282 if ((err
= alloc_disk_sb(rdev
)))
2285 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2289 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2292 rdev
->saved_raid_disk
= -1;
2293 rdev
->raid_disk
= -1;
2295 rdev
->data_offset
= 0;
2296 rdev
->sb_events
= 0;
2297 atomic_set(&rdev
->nr_pending
, 0);
2298 atomic_set(&rdev
->read_errors
, 0);
2299 atomic_set(&rdev
->corrected_errors
, 0);
2301 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2304 "md: %s has zero or unknown size, marking faulty!\n",
2305 bdevname(rdev
->bdev
,b
));
2310 if (super_format
>= 0) {
2311 err
= super_types
[super_format
].
2312 load_super(rdev
, NULL
, super_minor
);
2313 if (err
== -EINVAL
) {
2315 "md: %s does not have a valid v%d.%d "
2316 "superblock, not importing!\n",
2317 bdevname(rdev
->bdev
,b
),
2318 super_format
, super_minor
);
2323 "md: could not read %s's sb, not importing!\n",
2324 bdevname(rdev
->bdev
,b
));
2329 INIT_LIST_HEAD(&rdev
->same_set
);
2330 init_waitqueue_head(&rdev
->blocked_wait
);
2335 if (rdev
->sb_page
) {
2341 return ERR_PTR(err
);
2345 * Check a full RAID array for plausibility
2349 static void analyze_sbs(mddev_t
* mddev
)
2352 struct list_head
*tmp
;
2353 mdk_rdev_t
*rdev
, *freshest
;
2354 char b
[BDEVNAME_SIZE
];
2357 rdev_for_each(rdev
, tmp
, mddev
)
2358 switch (super_types
[mddev
->major_version
].
2359 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2367 "md: fatal superblock inconsistency in %s"
2368 " -- removing from array\n",
2369 bdevname(rdev
->bdev
,b
));
2370 kick_rdev_from_array(rdev
);
2374 super_types
[mddev
->major_version
].
2375 validate_super(mddev
, freshest
);
2378 rdev_for_each(rdev
, tmp
, mddev
) {
2379 if (rdev
!= freshest
)
2380 if (super_types
[mddev
->major_version
].
2381 validate_super(mddev
, rdev
)) {
2382 printk(KERN_WARNING
"md: kicking non-fresh %s"
2384 bdevname(rdev
->bdev
,b
));
2385 kick_rdev_from_array(rdev
);
2388 if (mddev
->level
== LEVEL_MULTIPATH
) {
2389 rdev
->desc_nr
= i
++;
2390 rdev
->raid_disk
= rdev
->desc_nr
;
2391 set_bit(In_sync
, &rdev
->flags
);
2392 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2393 rdev
->raid_disk
= -1;
2394 clear_bit(In_sync
, &rdev
->flags
);
2400 if (mddev
->recovery_cp
!= MaxSector
&&
2402 printk(KERN_ERR
"md: %s: raid array is not clean"
2403 " -- starting background reconstruction\n",
2409 safe_delay_show(mddev_t
*mddev
, char *page
)
2411 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2412 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2415 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2423 /* remove a period, and count digits after it */
2424 if (len
>= sizeof(buf
))
2426 strlcpy(buf
, cbuf
, len
);
2428 for (i
=0; i
<len
; i
++) {
2430 if (isdigit(buf
[i
])) {
2435 } else if (buf
[i
] == '.') {
2440 msec
= simple_strtoul(buf
, &e
, 10);
2441 if (e
== buf
|| (*e
&& *e
!= '\n'))
2443 msec
= (msec
* 1000) / scale
;
2445 mddev
->safemode_delay
= 0;
2447 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2448 if (mddev
->safemode_delay
== 0)
2449 mddev
->safemode_delay
= 1;
2453 static struct md_sysfs_entry md_safe_delay
=
2454 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2457 level_show(mddev_t
*mddev
, char *page
)
2459 struct mdk_personality
*p
= mddev
->pers
;
2461 return sprintf(page
, "%s\n", p
->name
);
2462 else if (mddev
->clevel
[0])
2463 return sprintf(page
, "%s\n", mddev
->clevel
);
2464 else if (mddev
->level
!= LEVEL_NONE
)
2465 return sprintf(page
, "%d\n", mddev
->level
);
2471 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2478 if (len
>= sizeof(mddev
->clevel
))
2480 strncpy(mddev
->clevel
, buf
, len
);
2481 if (mddev
->clevel
[len
-1] == '\n')
2483 mddev
->clevel
[len
] = 0;
2484 mddev
->level
= LEVEL_NONE
;
2488 static struct md_sysfs_entry md_level
=
2489 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2493 layout_show(mddev_t
*mddev
, char *page
)
2495 /* just a number, not meaningful for all levels */
2496 if (mddev
->reshape_position
!= MaxSector
&&
2497 mddev
->layout
!= mddev
->new_layout
)
2498 return sprintf(page
, "%d (%d)\n",
2499 mddev
->new_layout
, mddev
->layout
);
2500 return sprintf(page
, "%d\n", mddev
->layout
);
2504 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2507 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2509 if (!*buf
|| (*e
&& *e
!= '\n'))
2514 if (mddev
->reshape_position
!= MaxSector
)
2515 mddev
->new_layout
= n
;
2520 static struct md_sysfs_entry md_layout
=
2521 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2525 raid_disks_show(mddev_t
*mddev
, char *page
)
2527 if (mddev
->raid_disks
== 0)
2529 if (mddev
->reshape_position
!= MaxSector
&&
2530 mddev
->delta_disks
!= 0)
2531 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2532 mddev
->raid_disks
- mddev
->delta_disks
);
2533 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2536 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2539 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2543 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2545 if (!*buf
|| (*e
&& *e
!= '\n'))
2549 rv
= update_raid_disks(mddev
, n
);
2550 else if (mddev
->reshape_position
!= MaxSector
) {
2551 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2552 mddev
->delta_disks
= n
- olddisks
;
2553 mddev
->raid_disks
= n
;
2555 mddev
->raid_disks
= n
;
2556 return rv
? rv
: len
;
2558 static struct md_sysfs_entry md_raid_disks
=
2559 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2562 chunk_size_show(mddev_t
*mddev
, char *page
)
2564 if (mddev
->reshape_position
!= MaxSector
&&
2565 mddev
->chunk_size
!= mddev
->new_chunk
)
2566 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2568 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2572 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2574 /* can only set chunk_size if array is not yet active */
2576 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2578 if (!*buf
|| (*e
&& *e
!= '\n'))
2583 else if (mddev
->reshape_position
!= MaxSector
)
2584 mddev
->new_chunk
= n
;
2586 mddev
->chunk_size
= n
;
2589 static struct md_sysfs_entry md_chunk_size
=
2590 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2593 resync_start_show(mddev_t
*mddev
, char *page
)
2595 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2599 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2602 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2606 if (!*buf
|| (*e
&& *e
!= '\n'))
2609 mddev
->recovery_cp
= n
;
2612 static struct md_sysfs_entry md_resync_start
=
2613 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2616 * The array state can be:
2619 * No devices, no size, no level
2620 * Equivalent to STOP_ARRAY ioctl
2622 * May have some settings, but array is not active
2623 * all IO results in error
2624 * When written, doesn't tear down array, but just stops it
2625 * suspended (not supported yet)
2626 * All IO requests will block. The array can be reconfigured.
2627 * Writing this, if accepted, will block until array is quiessent
2629 * no resync can happen. no superblocks get written.
2630 * write requests fail
2632 * like readonly, but behaves like 'clean' on a write request.
2634 * clean - no pending writes, but otherwise active.
2635 * When written to inactive array, starts without resync
2636 * If a write request arrives then
2637 * if metadata is known, mark 'dirty' and switch to 'active'.
2638 * if not known, block and switch to write-pending
2639 * If written to an active array that has pending writes, then fails.
2641 * fully active: IO and resync can be happening.
2642 * When written to inactive array, starts with resync
2645 * clean, but writes are blocked waiting for 'active' to be written.
2648 * like active, but no writes have been seen for a while (100msec).
2651 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2652 write_pending
, active_idle
, bad_word
};
2653 static char *array_states
[] = {
2654 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2655 "write-pending", "active-idle", NULL
};
2657 static int match_word(const char *word
, char **list
)
2660 for (n
=0; list
[n
]; n
++)
2661 if (cmd_match(word
, list
[n
]))
2667 array_state_show(mddev_t
*mddev
, char *page
)
2669 enum array_state st
= inactive
;
2682 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2684 else if (mddev
->safemode
)
2690 if (list_empty(&mddev
->disks
) &&
2691 mddev
->raid_disks
== 0 &&
2697 return sprintf(page
, "%s\n", array_states
[st
]);
2700 static int do_md_stop(mddev_t
* mddev
, int ro
);
2701 static int do_md_run(mddev_t
* mddev
);
2702 static int restart_array(mddev_t
*mddev
);
2705 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2708 enum array_state st
= match_word(buf
, array_states
);
2713 /* stopping an active array */
2714 if (atomic_read(&mddev
->active
) > 1)
2716 err
= do_md_stop(mddev
, 0);
2719 /* stopping an active array */
2721 if (atomic_read(&mddev
->active
) > 1)
2723 err
= do_md_stop(mddev
, 2);
2725 err
= 0; /* already inactive */
2728 break; /* not supported yet */
2731 err
= do_md_stop(mddev
, 1);
2734 set_disk_ro(mddev
->gendisk
, 1);
2735 err
= do_md_run(mddev
);
2741 err
= do_md_stop(mddev
, 1);
2743 err
= restart_array(mddev
);
2746 set_disk_ro(mddev
->gendisk
, 0);
2750 err
= do_md_run(mddev
);
2755 restart_array(mddev
);
2756 spin_lock_irq(&mddev
->write_lock
);
2757 if (atomic_read(&mddev
->writes_pending
) == 0) {
2758 if (mddev
->in_sync
== 0) {
2760 if (mddev
->safemode
== 1)
2761 mddev
->safemode
= 0;
2762 if (mddev
->persistent
)
2763 set_bit(MD_CHANGE_CLEAN
,
2769 spin_unlock_irq(&mddev
->write_lock
);
2772 mddev
->recovery_cp
= MaxSector
;
2773 err
= do_md_run(mddev
);
2778 restart_array(mddev
);
2779 if (mddev
->external
)
2780 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2781 wake_up(&mddev
->sb_wait
);
2785 set_disk_ro(mddev
->gendisk
, 0);
2786 err
= do_md_run(mddev
);
2791 /* these cannot be set */
2797 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
2801 static struct md_sysfs_entry md_array_state
=
2802 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2805 null_show(mddev_t
*mddev
, char *page
)
2811 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2813 /* buf must be %d:%d\n? giving major and minor numbers */
2814 /* The new device is added to the array.
2815 * If the array has a persistent superblock, we read the
2816 * superblock to initialise info and check validity.
2817 * Otherwise, only checking done is that in bind_rdev_to_array,
2818 * which mainly checks size.
2821 int major
= simple_strtoul(buf
, &e
, 10);
2827 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2829 minor
= simple_strtoul(e
+1, &e
, 10);
2830 if (*e
&& *e
!= '\n')
2832 dev
= MKDEV(major
, minor
);
2833 if (major
!= MAJOR(dev
) ||
2834 minor
!= MINOR(dev
))
2838 if (mddev
->persistent
) {
2839 rdev
= md_import_device(dev
, mddev
->major_version
,
2840 mddev
->minor_version
);
2841 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2842 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2843 mdk_rdev_t
, same_set
);
2844 err
= super_types
[mddev
->major_version
]
2845 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2849 } else if (mddev
->external
)
2850 rdev
= md_import_device(dev
, -2, -1);
2852 rdev
= md_import_device(dev
, -1, -1);
2855 return PTR_ERR(rdev
);
2856 err
= bind_rdev_to_array(rdev
, mddev
);
2860 return err
? err
: len
;
2863 static struct md_sysfs_entry md_new_device
=
2864 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2867 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2870 unsigned long chunk
, end_chunk
;
2874 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2876 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2877 if (buf
== end
) break;
2878 if (*end
== '-') { /* range */
2880 end_chunk
= simple_strtoul(buf
, &end
, 0);
2881 if (buf
== end
) break;
2883 if (*end
&& !isspace(*end
)) break;
2884 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2886 while (isspace(*buf
)) buf
++;
2888 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2893 static struct md_sysfs_entry md_bitmap
=
2894 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2897 size_show(mddev_t
*mddev
, char *page
)
2899 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2902 static int update_size(mddev_t
*mddev
, unsigned long size
);
2905 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2907 /* If array is inactive, we can reduce the component size, but
2908 * not increase it (except from 0).
2909 * If array is active, we can try an on-line resize
2913 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2914 if (!*buf
|| *buf
== '\n' ||
2919 err
= update_size(mddev
, size
);
2920 md_update_sb(mddev
, 1);
2922 if (mddev
->size
== 0 ||
2928 return err
? err
: len
;
2931 static struct md_sysfs_entry md_size
=
2932 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2937 * 'none' for arrays with no metadata (good luck...)
2938 * 'external' for arrays with externally managed metadata,
2939 * or N.M for internally known formats
2942 metadata_show(mddev_t
*mddev
, char *page
)
2944 if (mddev
->persistent
)
2945 return sprintf(page
, "%d.%d\n",
2946 mddev
->major_version
, mddev
->minor_version
);
2947 else if (mddev
->external
)
2948 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
2950 return sprintf(page
, "none\n");
2954 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2958 if (!list_empty(&mddev
->disks
))
2961 if (cmd_match(buf
, "none")) {
2962 mddev
->persistent
= 0;
2963 mddev
->external
= 0;
2964 mddev
->major_version
= 0;
2965 mddev
->minor_version
= 90;
2968 if (strncmp(buf
, "external:", 9) == 0) {
2969 size_t namelen
= len
-9;
2970 if (namelen
>= sizeof(mddev
->metadata_type
))
2971 namelen
= sizeof(mddev
->metadata_type
)-1;
2972 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
2973 mddev
->metadata_type
[namelen
] = 0;
2974 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
2975 mddev
->metadata_type
[--namelen
] = 0;
2976 mddev
->persistent
= 0;
2977 mddev
->external
= 1;
2978 mddev
->major_version
= 0;
2979 mddev
->minor_version
= 90;
2982 major
= simple_strtoul(buf
, &e
, 10);
2983 if (e
==buf
|| *e
!= '.')
2986 minor
= simple_strtoul(buf
, &e
, 10);
2987 if (e
==buf
|| (*e
&& *e
!= '\n') )
2989 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2991 mddev
->major_version
= major
;
2992 mddev
->minor_version
= minor
;
2993 mddev
->persistent
= 1;
2994 mddev
->external
= 0;
2998 static struct md_sysfs_entry md_metadata
=
2999 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3002 action_show(mddev_t
*mddev
, char *page
)
3004 char *type
= "idle";
3005 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3006 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3007 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3009 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3010 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3012 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3016 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3019 return sprintf(page
, "%s\n", type
);
3023 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3025 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3028 if (cmd_match(page
, "idle")) {
3029 if (mddev
->sync_thread
) {
3030 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3031 md_unregister_thread(mddev
->sync_thread
);
3032 mddev
->sync_thread
= NULL
;
3033 mddev
->recovery
= 0;
3035 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3036 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3038 else if (cmd_match(page
, "resync"))
3039 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3040 else if (cmd_match(page
, "recover")) {
3041 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3042 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3043 } else if (cmd_match(page
, "reshape")) {
3045 if (mddev
->pers
->start_reshape
== NULL
)
3047 err
= mddev
->pers
->start_reshape(mddev
);
3050 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3052 if (cmd_match(page
, "check"))
3053 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3054 else if (!cmd_match(page
, "repair"))
3056 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3057 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3059 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3060 md_wakeup_thread(mddev
->thread
);
3061 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
3066 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3068 return sprintf(page
, "%llu\n",
3069 (unsigned long long) mddev
->resync_mismatches
);
3072 static struct md_sysfs_entry md_scan_mode
=
3073 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3076 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3079 sync_min_show(mddev_t
*mddev
, char *page
)
3081 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3082 mddev
->sync_speed_min
? "local": "system");
3086 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3090 if (strncmp(buf
, "system", 6)==0) {
3091 mddev
->sync_speed_min
= 0;
3094 min
= simple_strtoul(buf
, &e
, 10);
3095 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3097 mddev
->sync_speed_min
= min
;
3101 static struct md_sysfs_entry md_sync_min
=
3102 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3105 sync_max_show(mddev_t
*mddev
, char *page
)
3107 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3108 mddev
->sync_speed_max
? "local": "system");
3112 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3116 if (strncmp(buf
, "system", 6)==0) {
3117 mddev
->sync_speed_max
= 0;
3120 max
= simple_strtoul(buf
, &e
, 10);
3121 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3123 mddev
->sync_speed_max
= max
;
3127 static struct md_sysfs_entry md_sync_max
=
3128 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3131 degraded_show(mddev_t
*mddev
, char *page
)
3133 return sprintf(page
, "%d\n", mddev
->degraded
);
3135 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3138 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3140 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3144 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3148 if (strict_strtol(buf
, 10, &n
))
3151 if (n
!= 0 && n
!= 1)
3154 mddev
->parallel_resync
= n
;
3156 if (mddev
->sync_thread
)
3157 wake_up(&resync_wait
);
3162 /* force parallel resync, even with shared block devices */
3163 static struct md_sysfs_entry md_sync_force_parallel
=
3164 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3165 sync_force_parallel_show
, sync_force_parallel_store
);
3168 sync_speed_show(mddev_t
*mddev
, char *page
)
3170 unsigned long resync
, dt
, db
;
3171 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3172 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3174 db
= resync
- mddev
->resync_mark_cnt
;
3175 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3178 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3181 sync_completed_show(mddev_t
*mddev
, char *page
)
3183 unsigned long max_blocks
, resync
;
3185 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3186 max_blocks
= mddev
->resync_max_sectors
;
3188 max_blocks
= mddev
->size
<< 1;
3190 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3191 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3194 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3197 min_sync_show(mddev_t
*mddev
, char *page
)
3199 return sprintf(page
, "%llu\n",
3200 (unsigned long long)mddev
->resync_min
);
3203 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3205 unsigned long long min
;
3206 if (strict_strtoull(buf
, 10, &min
))
3208 if (min
> mddev
->resync_max
)
3210 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3213 /* Must be a multiple of chunk_size */
3214 if (mddev
->chunk_size
) {
3215 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3218 mddev
->resync_min
= min
;
3223 static struct md_sysfs_entry md_min_sync
=
3224 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3227 max_sync_show(mddev_t
*mddev
, char *page
)
3229 if (mddev
->resync_max
== MaxSector
)
3230 return sprintf(page
, "max\n");
3232 return sprintf(page
, "%llu\n",
3233 (unsigned long long)mddev
->resync_max
);
3236 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3238 if (strncmp(buf
, "max", 3) == 0)
3239 mddev
->resync_max
= MaxSector
;
3241 unsigned long long max
;
3242 if (strict_strtoull(buf
, 10, &max
))
3244 if (max
< mddev
->resync_min
)
3246 if (max
< mddev
->resync_max
&&
3247 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3250 /* Must be a multiple of chunk_size */
3251 if (mddev
->chunk_size
) {
3252 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3255 mddev
->resync_max
= max
;
3257 wake_up(&mddev
->recovery_wait
);
3261 static struct md_sysfs_entry md_max_sync
=
3262 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3265 suspend_lo_show(mddev_t
*mddev
, char *page
)
3267 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3271 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3274 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3276 if (mddev
->pers
->quiesce
== NULL
)
3278 if (buf
== e
|| (*e
&& *e
!= '\n'))
3280 if (new >= mddev
->suspend_hi
||
3281 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3282 mddev
->suspend_lo
= new;
3283 mddev
->pers
->quiesce(mddev
, 2);
3288 static struct md_sysfs_entry md_suspend_lo
=
3289 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3293 suspend_hi_show(mddev_t
*mddev
, char *page
)
3295 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3299 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3302 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3304 if (mddev
->pers
->quiesce
== NULL
)
3306 if (buf
== e
|| (*e
&& *e
!= '\n'))
3308 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3309 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3310 mddev
->suspend_hi
= new;
3311 mddev
->pers
->quiesce(mddev
, 1);
3312 mddev
->pers
->quiesce(mddev
, 0);
3317 static struct md_sysfs_entry md_suspend_hi
=
3318 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3321 reshape_position_show(mddev_t
*mddev
, char *page
)
3323 if (mddev
->reshape_position
!= MaxSector
)
3324 return sprintf(page
, "%llu\n",
3325 (unsigned long long)mddev
->reshape_position
);
3326 strcpy(page
, "none\n");
3331 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3334 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3337 if (buf
== e
|| (*e
&& *e
!= '\n'))
3339 mddev
->reshape_position
= new;
3340 mddev
->delta_disks
= 0;
3341 mddev
->new_level
= mddev
->level
;
3342 mddev
->new_layout
= mddev
->layout
;
3343 mddev
->new_chunk
= mddev
->chunk_size
;
3347 static struct md_sysfs_entry md_reshape_position
=
3348 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3349 reshape_position_store
);
3352 static struct attribute
*md_default_attrs
[] = {
3355 &md_raid_disks
.attr
,
3356 &md_chunk_size
.attr
,
3358 &md_resync_start
.attr
,
3360 &md_new_device
.attr
,
3361 &md_safe_delay
.attr
,
3362 &md_array_state
.attr
,
3363 &md_reshape_position
.attr
,
3367 static struct attribute
*md_redundancy_attrs
[] = {
3369 &md_mismatches
.attr
,
3372 &md_sync_speed
.attr
,
3373 &md_sync_force_parallel
.attr
,
3374 &md_sync_completed
.attr
,
3377 &md_suspend_lo
.attr
,
3378 &md_suspend_hi
.attr
,
3383 static struct attribute_group md_redundancy_group
= {
3385 .attrs
= md_redundancy_attrs
,
3390 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3392 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3393 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3398 rv
= mddev_lock(mddev
);
3400 rv
= entry
->show(mddev
, page
);
3401 mddev_unlock(mddev
);
3407 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3408 const char *page
, size_t length
)
3410 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3411 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3416 if (!capable(CAP_SYS_ADMIN
))
3418 rv
= mddev_lock(mddev
);
3420 rv
= entry
->store(mddev
, page
, length
);
3421 mddev_unlock(mddev
);
3426 static void md_free(struct kobject
*ko
)
3428 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3432 static struct sysfs_ops md_sysfs_ops
= {
3433 .show
= md_attr_show
,
3434 .store
= md_attr_store
,
3436 static struct kobj_type md_ktype
= {
3438 .sysfs_ops
= &md_sysfs_ops
,
3439 .default_attrs
= md_default_attrs
,
3444 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3446 static DEFINE_MUTEX(disks_mutex
);
3447 mddev_t
*mddev
= mddev_find(dev
);
3448 struct gendisk
*disk
;
3449 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3450 int shift
= partitioned
? MdpMinorShift
: 0;
3451 int unit
= MINOR(dev
) >> shift
;
3457 mutex_lock(&disks_mutex
);
3458 if (mddev
->gendisk
) {
3459 mutex_unlock(&disks_mutex
);
3463 disk
= alloc_disk(1 << shift
);
3465 mutex_unlock(&disks_mutex
);
3469 disk
->major
= MAJOR(dev
);
3470 disk
->first_minor
= unit
<< shift
;
3472 sprintf(disk
->disk_name
, "md_d%d", unit
);
3474 sprintf(disk
->disk_name
, "md%d", unit
);
3475 disk
->fops
= &md_fops
;
3476 disk
->private_data
= mddev
;
3477 disk
->queue
= mddev
->queue
;
3479 mddev
->gendisk
= disk
;
3480 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
, &disk
->dev
.kobj
,
3482 mutex_unlock(&disks_mutex
);
3484 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3487 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3491 static void md_safemode_timeout(unsigned long data
)
3493 mddev_t
*mddev
= (mddev_t
*) data
;
3495 if (!atomic_read(&mddev
->writes_pending
)) {
3496 mddev
->safemode
= 1;
3497 if (mddev
->external
)
3498 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3500 md_wakeup_thread(mddev
->thread
);
3503 static int start_dirty_degraded
;
3505 static int do_md_run(mddev_t
* mddev
)
3509 struct list_head
*tmp
;
3511 struct gendisk
*disk
;
3512 struct mdk_personality
*pers
;
3513 char b
[BDEVNAME_SIZE
];
3515 if (list_empty(&mddev
->disks
))
3516 /* cannot run an array with no devices.. */
3523 * Analyze all RAID superblock(s)
3525 if (!mddev
->raid_disks
) {
3526 if (!mddev
->persistent
)
3531 chunk_size
= mddev
->chunk_size
;
3534 if (chunk_size
> MAX_CHUNK_SIZE
) {
3535 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3536 chunk_size
, MAX_CHUNK_SIZE
);
3540 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3542 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3543 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3546 if (chunk_size
< PAGE_SIZE
) {
3547 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3548 chunk_size
, PAGE_SIZE
);
3552 /* devices must have minimum size of one chunk */
3553 rdev_for_each(rdev
, tmp
, mddev
) {
3554 if (test_bit(Faulty
, &rdev
->flags
))
3556 if (rdev
->size
< chunk_size
/ 1024) {
3558 "md: Dev %s smaller than chunk_size:"
3560 bdevname(rdev
->bdev
,b
),
3561 (unsigned long long)rdev
->size
,
3569 if (mddev
->level
!= LEVEL_NONE
)
3570 request_module("md-level-%d", mddev
->level
);
3571 else if (mddev
->clevel
[0])
3572 request_module("md-%s", mddev
->clevel
);
3576 * Drop all container device buffers, from now on
3577 * the only valid external interface is through the md
3580 rdev_for_each(rdev
, tmp
, mddev
) {
3581 if (test_bit(Faulty
, &rdev
->flags
))
3583 sync_blockdev(rdev
->bdev
);
3584 invalidate_bdev(rdev
->bdev
);
3586 /* perform some consistency tests on the device.
3587 * We don't want the data to overlap the metadata,
3588 * Internal Bitmap issues has handled elsewhere.
3590 if (rdev
->data_offset
< rdev
->sb_offset
) {
3592 rdev
->data_offset
+ mddev
->size
*2
3593 > rdev
->sb_offset
*2) {
3594 printk("md: %s: data overlaps metadata\n",
3599 if (rdev
->sb_offset
*2 + rdev
->sb_size
/512
3600 > rdev
->data_offset
) {
3601 printk("md: %s: metadata overlaps data\n",
3606 sysfs_notify(&rdev
->kobj
, NULL
, "state");
3609 md_probe(mddev
->unit
, NULL
, NULL
);
3610 disk
= mddev
->gendisk
;
3614 spin_lock(&pers_lock
);
3615 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3616 if (!pers
|| !try_module_get(pers
->owner
)) {
3617 spin_unlock(&pers_lock
);
3618 if (mddev
->level
!= LEVEL_NONE
)
3619 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3622 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3627 spin_unlock(&pers_lock
);
3628 mddev
->level
= pers
->level
;
3629 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3631 if (mddev
->reshape_position
!= MaxSector
&&
3632 pers
->start_reshape
== NULL
) {
3633 /* This personality cannot handle reshaping... */
3635 module_put(pers
->owner
);
3639 if (pers
->sync_request
) {
3640 /* Warn if this is a potentially silly
3643 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3645 struct list_head
*tmp2
;
3647 rdev_for_each(rdev
, tmp
, mddev
) {
3648 rdev_for_each(rdev2
, tmp2
, mddev
) {
3650 rdev
->bdev
->bd_contains
==
3651 rdev2
->bdev
->bd_contains
) {
3653 "%s: WARNING: %s appears to be"
3654 " on the same physical disk as"
3657 bdevname(rdev
->bdev
,b
),
3658 bdevname(rdev2
->bdev
,b2
));
3665 "True protection against single-disk"
3666 " failure might be compromised.\n");
3669 mddev
->recovery
= 0;
3670 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3671 mddev
->barriers_work
= 1;
3672 mddev
->ok_start_degraded
= start_dirty_degraded
;
3675 mddev
->ro
= 2; /* read-only, but switch on first write */
3677 err
= mddev
->pers
->run(mddev
);
3679 printk(KERN_ERR
"md: pers->run() failed ...\n");
3680 else if (mddev
->pers
->sync_request
) {
3681 err
= bitmap_create(mddev
);
3683 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3684 mdname(mddev
), err
);
3685 mddev
->pers
->stop(mddev
);
3689 module_put(mddev
->pers
->owner
);
3691 bitmap_destroy(mddev
);
3694 if (mddev
->pers
->sync_request
) {
3695 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3697 "md: cannot register extra attributes for %s\n",
3699 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3702 atomic_set(&mddev
->writes_pending
,0);
3703 mddev
->safemode
= 0;
3704 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3705 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3706 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3709 rdev_for_each(rdev
, tmp
, mddev
)
3710 if (rdev
->raid_disk
>= 0) {
3712 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3713 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3714 printk("md: cannot register %s for %s\n",
3718 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3721 md_update_sb(mddev
, 0);
3723 set_capacity(disk
, mddev
->array_size
<<1);
3725 /* If we call blk_queue_make_request here, it will
3726 * re-initialise max_sectors etc which may have been
3727 * refined inside -> run. So just set the bits we need to set.
3728 * Most initialisation happended when we called
3729 * blk_queue_make_request(..., md_fail_request)
3732 mddev
->queue
->queuedata
= mddev
;
3733 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3735 /* If there is a partially-recovered drive we need to
3736 * start recovery here. If we leave it to md_check_recovery,
3737 * it will remove the drives and not do the right thing
3739 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3740 struct list_head
*rtmp
;
3742 rdev_for_each(rdev
, rtmp
, mddev
)
3743 if (rdev
->raid_disk
>= 0 &&
3744 !test_bit(In_sync
, &rdev
->flags
) &&
3745 !test_bit(Faulty
, &rdev
->flags
))
3746 /* complete an interrupted recovery */
3748 if (spares
&& mddev
->pers
->sync_request
) {
3749 mddev
->recovery
= 0;
3750 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3751 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3754 if (!mddev
->sync_thread
) {
3755 printk(KERN_ERR
"%s: could not start resync"
3758 /* leave the spares where they are, it shouldn't hurt */
3759 mddev
->recovery
= 0;
3763 md_wakeup_thread(mddev
->thread
);
3764 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3767 md_new_event(mddev
);
3768 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3769 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
3770 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3771 kobject_uevent(&mddev
->gendisk
->dev
.kobj
, KOBJ_CHANGE
);
3775 static int restart_array(mddev_t
*mddev
)
3777 struct gendisk
*disk
= mddev
->gendisk
;
3781 * Complain if it has no devices
3784 if (list_empty(&mddev
->disks
))
3792 mddev
->safemode
= 0;
3794 set_disk_ro(disk
, 0);
3796 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3799 * Kick recovery or resync if necessary
3801 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3802 md_wakeup_thread(mddev
->thread
);
3803 md_wakeup_thread(mddev
->sync_thread
);
3805 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3814 /* similar to deny_write_access, but accounts for our holding a reference
3815 * to the file ourselves */
3816 static int deny_bitmap_write_access(struct file
* file
)
3818 struct inode
*inode
= file
->f_mapping
->host
;
3820 spin_lock(&inode
->i_lock
);
3821 if (atomic_read(&inode
->i_writecount
) > 1) {
3822 spin_unlock(&inode
->i_lock
);
3825 atomic_set(&inode
->i_writecount
, -1);
3826 spin_unlock(&inode
->i_lock
);
3831 static void restore_bitmap_write_access(struct file
*file
)
3833 struct inode
*inode
= file
->f_mapping
->host
;
3835 spin_lock(&inode
->i_lock
);
3836 atomic_set(&inode
->i_writecount
, 1);
3837 spin_unlock(&inode
->i_lock
);
3841 * 0 - completely stop and dis-assemble array
3842 * 1 - switch to readonly
3843 * 2 - stop but do not disassemble array
3845 static int do_md_stop(mddev_t
* mddev
, int mode
)
3848 struct gendisk
*disk
= mddev
->gendisk
;
3851 if (atomic_read(&mddev
->active
)>2) {
3852 printk("md: %s still in use.\n",mdname(mddev
));
3856 if (mddev
->sync_thread
) {
3857 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3858 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3859 md_unregister_thread(mddev
->sync_thread
);
3860 mddev
->sync_thread
= NULL
;
3863 del_timer_sync(&mddev
->safemode_timer
);
3865 invalidate_partition(disk
, 0);
3868 case 1: /* readonly */
3874 case 0: /* disassemble */
3876 bitmap_flush(mddev
);
3877 md_super_wait(mddev
);
3879 set_disk_ro(disk
, 0);
3880 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3881 mddev
->pers
->stop(mddev
);
3882 mddev
->queue
->merge_bvec_fn
= NULL
;
3883 mddev
->queue
->unplug_fn
= NULL
;
3884 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3885 if (mddev
->pers
->sync_request
)
3886 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3888 module_put(mddev
->pers
->owner
);
3890 /* tell userspace to handle 'inactive' */
3891 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3893 set_capacity(disk
, 0);
3899 if (!mddev
->in_sync
|| mddev
->flags
) {
3900 /* mark array as shutdown cleanly */
3902 md_update_sb(mddev
, 1);
3905 set_disk_ro(disk
, 1);
3906 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3910 * Free resources if final stop
3914 struct list_head
*tmp
;
3916 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3918 bitmap_destroy(mddev
);
3919 if (mddev
->bitmap_file
) {
3920 restore_bitmap_write_access(mddev
->bitmap_file
);
3921 fput(mddev
->bitmap_file
);
3922 mddev
->bitmap_file
= NULL
;
3924 mddev
->bitmap_offset
= 0;
3926 rdev_for_each(rdev
, tmp
, mddev
)
3927 if (rdev
->raid_disk
>= 0) {
3929 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3930 sysfs_remove_link(&mddev
->kobj
, nm
);
3933 /* make sure all md_delayed_delete calls have finished */
3934 flush_scheduled_work();
3936 export_array(mddev
);
3938 mddev
->array_size
= 0;
3940 mddev
->raid_disks
= 0;
3941 mddev
->recovery_cp
= 0;
3942 mddev
->resync_min
= 0;
3943 mddev
->resync_max
= MaxSector
;
3944 mddev
->reshape_position
= MaxSector
;
3945 mddev
->external
= 0;
3946 mddev
->persistent
= 0;
3947 mddev
->level
= LEVEL_NONE
;
3948 mddev
->clevel
[0] = 0;
3951 mddev
->metadata_type
[0] = 0;
3952 mddev
->chunk_size
= 0;
3953 mddev
->ctime
= mddev
->utime
= 0;
3955 mddev
->max_disks
= 0;
3957 mddev
->delta_disks
= 0;
3958 mddev
->new_level
= LEVEL_NONE
;
3959 mddev
->new_layout
= 0;
3960 mddev
->new_chunk
= 0;
3961 mddev
->curr_resync
= 0;
3962 mddev
->resync_mismatches
= 0;
3963 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
3964 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
3965 mddev
->recovery
= 0;
3968 mddev
->degraded
= 0;
3969 mddev
->barriers_work
= 0;
3970 mddev
->safemode
= 0;
3972 } else if (mddev
->pers
)
3973 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3976 md_new_event(mddev
);
3977 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3983 static void autorun_array(mddev_t
*mddev
)
3986 struct list_head
*tmp
;
3989 if (list_empty(&mddev
->disks
))
3992 printk(KERN_INFO
"md: running: ");
3994 rdev_for_each(rdev
, tmp
, mddev
) {
3995 char b
[BDEVNAME_SIZE
];
3996 printk("<%s>", bdevname(rdev
->bdev
,b
));
4000 err
= do_md_run (mddev
);
4002 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4003 do_md_stop (mddev
, 0);
4008 * lets try to run arrays based on all disks that have arrived
4009 * until now. (those are in pending_raid_disks)
4011 * the method: pick the first pending disk, collect all disks with
4012 * the same UUID, remove all from the pending list and put them into
4013 * the 'same_array' list. Then order this list based on superblock
4014 * update time (freshest comes first), kick out 'old' disks and
4015 * compare superblocks. If everything's fine then run it.
4017 * If "unit" is allocated, then bump its reference count
4019 static void autorun_devices(int part
)
4021 struct list_head
*tmp
;
4022 mdk_rdev_t
*rdev0
, *rdev
;
4024 char b
[BDEVNAME_SIZE
];
4026 printk(KERN_INFO
"md: autorun ...\n");
4027 while (!list_empty(&pending_raid_disks
)) {
4030 LIST_HEAD(candidates
);
4031 rdev0
= list_entry(pending_raid_disks
.next
,
4032 mdk_rdev_t
, same_set
);
4034 printk(KERN_INFO
"md: considering %s ...\n",
4035 bdevname(rdev0
->bdev
,b
));
4036 INIT_LIST_HEAD(&candidates
);
4037 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
)
4038 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4039 printk(KERN_INFO
"md: adding %s ...\n",
4040 bdevname(rdev
->bdev
,b
));
4041 list_move(&rdev
->same_set
, &candidates
);
4044 * now we have a set of devices, with all of them having
4045 * mostly sane superblocks. It's time to allocate the
4049 dev
= MKDEV(mdp_major
,
4050 rdev0
->preferred_minor
<< MdpMinorShift
);
4051 unit
= MINOR(dev
) >> MdpMinorShift
;
4053 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4056 if (rdev0
->preferred_minor
!= unit
) {
4057 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4058 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4062 md_probe(dev
, NULL
, NULL
);
4063 mddev
= mddev_find(dev
);
4064 if (!mddev
|| !mddev
->gendisk
) {
4068 "md: cannot allocate memory for md drive.\n");
4071 if (mddev_lock(mddev
))
4072 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4074 else if (mddev
->raid_disks
|| mddev
->major_version
4075 || !list_empty(&mddev
->disks
)) {
4077 "md: %s already running, cannot run %s\n",
4078 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4079 mddev_unlock(mddev
);
4081 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4082 mddev
->persistent
= 1;
4083 rdev_for_each_list(rdev
, tmp
, candidates
) {
4084 list_del_init(&rdev
->same_set
);
4085 if (bind_rdev_to_array(rdev
, mddev
))
4088 autorun_array(mddev
);
4089 mddev_unlock(mddev
);
4091 /* on success, candidates will be empty, on error
4094 rdev_for_each_list(rdev
, tmp
, candidates
)
4098 printk(KERN_INFO
"md: ... autorun DONE.\n");
4100 #endif /* !MODULE */
4102 static int get_version(void __user
* arg
)
4106 ver
.major
= MD_MAJOR_VERSION
;
4107 ver
.minor
= MD_MINOR_VERSION
;
4108 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4110 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4116 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4118 mdu_array_info_t info
;
4119 int nr
,working
,active
,failed
,spare
;
4121 struct list_head
*tmp
;
4123 nr
=working
=active
=failed
=spare
=0;
4124 rdev_for_each(rdev
, tmp
, mddev
) {
4126 if (test_bit(Faulty
, &rdev
->flags
))
4130 if (test_bit(In_sync
, &rdev
->flags
))
4137 info
.major_version
= mddev
->major_version
;
4138 info
.minor_version
= mddev
->minor_version
;
4139 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4140 info
.ctime
= mddev
->ctime
;
4141 info
.level
= mddev
->level
;
4142 info
.size
= mddev
->size
;
4143 if (info
.size
!= mddev
->size
) /* overflow */
4146 info
.raid_disks
= mddev
->raid_disks
;
4147 info
.md_minor
= mddev
->md_minor
;
4148 info
.not_persistent
= !mddev
->persistent
;
4150 info
.utime
= mddev
->utime
;
4153 info
.state
= (1<<MD_SB_CLEAN
);
4154 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4155 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4156 info
.active_disks
= active
;
4157 info
.working_disks
= working
;
4158 info
.failed_disks
= failed
;
4159 info
.spare_disks
= spare
;
4161 info
.layout
= mddev
->layout
;
4162 info
.chunk_size
= mddev
->chunk_size
;
4164 if (copy_to_user(arg
, &info
, sizeof(info
)))
4170 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4172 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4173 char *ptr
, *buf
= NULL
;
4176 if (md_allow_write(mddev
))
4177 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4179 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4184 /* bitmap disabled, zero the first byte and copy out */
4185 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4186 file
->pathname
[0] = '\0';
4190 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4194 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4198 strcpy(file
->pathname
, ptr
);
4202 if (copy_to_user(arg
, file
, sizeof(*file
)))
4210 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4212 mdu_disk_info_t info
;
4216 if (copy_from_user(&info
, arg
, sizeof(info
)))
4221 rdev
= find_rdev_nr(mddev
, nr
);
4223 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4224 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4225 info
.raid_disk
= rdev
->raid_disk
;
4227 if (test_bit(Faulty
, &rdev
->flags
))
4228 info
.state
|= (1<<MD_DISK_FAULTY
);
4229 else if (test_bit(In_sync
, &rdev
->flags
)) {
4230 info
.state
|= (1<<MD_DISK_ACTIVE
);
4231 info
.state
|= (1<<MD_DISK_SYNC
);
4233 if (test_bit(WriteMostly
, &rdev
->flags
))
4234 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4236 info
.major
= info
.minor
= 0;
4237 info
.raid_disk
= -1;
4238 info
.state
= (1<<MD_DISK_REMOVED
);
4241 if (copy_to_user(arg
, &info
, sizeof(info
)))
4247 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4249 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4251 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4253 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4256 if (!mddev
->raid_disks
) {
4258 /* expecting a device which has a superblock */
4259 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4262 "md: md_import_device returned %ld\n",
4264 return PTR_ERR(rdev
);
4266 if (!list_empty(&mddev
->disks
)) {
4267 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4268 mdk_rdev_t
, same_set
);
4269 int err
= super_types
[mddev
->major_version
]
4270 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4273 "md: %s has different UUID to %s\n",
4274 bdevname(rdev
->bdev
,b
),
4275 bdevname(rdev0
->bdev
,b2
));
4280 err
= bind_rdev_to_array(rdev
, mddev
);
4287 * add_new_disk can be used once the array is assembled
4288 * to add "hot spares". They must already have a superblock
4293 if (!mddev
->pers
->hot_add_disk
) {
4295 "%s: personality does not support diskops!\n",
4299 if (mddev
->persistent
)
4300 rdev
= md_import_device(dev
, mddev
->major_version
,
4301 mddev
->minor_version
);
4303 rdev
= md_import_device(dev
, -1, -1);
4306 "md: md_import_device returned %ld\n",
4308 return PTR_ERR(rdev
);
4310 /* set save_raid_disk if appropriate */
4311 if (!mddev
->persistent
) {
4312 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4313 info
->raid_disk
< mddev
->raid_disks
)
4314 rdev
->raid_disk
= info
->raid_disk
;
4316 rdev
->raid_disk
= -1;
4318 super_types
[mddev
->major_version
].
4319 validate_super(mddev
, rdev
);
4320 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4322 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4323 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4324 set_bit(WriteMostly
, &rdev
->flags
);
4326 rdev
->raid_disk
= -1;
4327 err
= bind_rdev_to_array(rdev
, mddev
);
4328 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4329 /* If there is hot_add_disk but no hot_remove_disk
4330 * then added disks for geometry changes,
4331 * and should be added immediately.
4333 super_types
[mddev
->major_version
].
4334 validate_super(mddev
, rdev
);
4335 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4337 unbind_rdev_from_array(rdev
);
4342 sysfs_notify(&rdev
->kobj
, NULL
, "state");
4344 md_update_sb(mddev
, 1);
4345 if (mddev
->degraded
)
4346 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4347 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4348 md_wakeup_thread(mddev
->thread
);
4352 /* otherwise, add_new_disk is only allowed
4353 * for major_version==0 superblocks
4355 if (mddev
->major_version
!= 0) {
4356 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4361 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4363 rdev
= md_import_device (dev
, -1, 0);
4366 "md: error, md_import_device() returned %ld\n",
4368 return PTR_ERR(rdev
);
4370 rdev
->desc_nr
= info
->number
;
4371 if (info
->raid_disk
< mddev
->raid_disks
)
4372 rdev
->raid_disk
= info
->raid_disk
;
4374 rdev
->raid_disk
= -1;
4376 if (rdev
->raid_disk
< mddev
->raid_disks
)
4377 if (info
->state
& (1<<MD_DISK_SYNC
))
4378 set_bit(In_sync
, &rdev
->flags
);
4380 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4381 set_bit(WriteMostly
, &rdev
->flags
);
4383 if (!mddev
->persistent
) {
4384 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4385 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
4387 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
4388 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4390 err
= bind_rdev_to_array(rdev
, mddev
);
4400 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4402 char b
[BDEVNAME_SIZE
];
4405 rdev
= find_rdev(mddev
, dev
);
4409 if (rdev
->raid_disk
>= 0)
4412 kick_rdev_from_array(rdev
);
4413 md_update_sb(mddev
, 1);
4414 md_new_event(mddev
);
4418 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4419 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4423 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4425 char b
[BDEVNAME_SIZE
];
4433 if (mddev
->major_version
!= 0) {
4434 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4435 " version-0 superblocks.\n",
4439 if (!mddev
->pers
->hot_add_disk
) {
4441 "%s: personality does not support diskops!\n",
4446 rdev
= md_import_device (dev
, -1, 0);
4449 "md: error, md_import_device() returned %ld\n",
4454 if (mddev
->persistent
)
4455 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
4458 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
4460 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4463 if (test_bit(Faulty
, &rdev
->flags
)) {
4465 "md: can not hot-add faulty %s disk to %s!\n",
4466 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4470 clear_bit(In_sync
, &rdev
->flags
);
4472 rdev
->saved_raid_disk
= -1;
4473 err
= bind_rdev_to_array(rdev
, mddev
);
4478 * The rest should better be atomic, we can have disk failures
4479 * noticed in interrupt contexts ...
4482 if (rdev
->desc_nr
== mddev
->max_disks
) {
4483 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4486 goto abort_unbind_export
;
4489 rdev
->raid_disk
= -1;
4491 md_update_sb(mddev
, 1);
4494 * Kick recovery, maybe this spare has to be added to the
4495 * array immediately.
4497 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4498 md_wakeup_thread(mddev
->thread
);
4499 md_new_event(mddev
);
4502 abort_unbind_export
:
4503 unbind_rdev_from_array(rdev
);
4510 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4515 if (!mddev
->pers
->quiesce
)
4517 if (mddev
->recovery
|| mddev
->sync_thread
)
4519 /* we should be able to change the bitmap.. */
4525 return -EEXIST
; /* cannot add when bitmap is present */
4526 mddev
->bitmap_file
= fget(fd
);
4528 if (mddev
->bitmap_file
== NULL
) {
4529 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4534 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4536 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4538 fput(mddev
->bitmap_file
);
4539 mddev
->bitmap_file
= NULL
;
4542 mddev
->bitmap_offset
= 0; /* file overrides offset */
4543 } else if (mddev
->bitmap
== NULL
)
4544 return -ENOENT
; /* cannot remove what isn't there */
4547 mddev
->pers
->quiesce(mddev
, 1);
4549 err
= bitmap_create(mddev
);
4550 if (fd
< 0 || err
) {
4551 bitmap_destroy(mddev
);
4552 fd
= -1; /* make sure to put the file */
4554 mddev
->pers
->quiesce(mddev
, 0);
4557 if (mddev
->bitmap_file
) {
4558 restore_bitmap_write_access(mddev
->bitmap_file
);
4559 fput(mddev
->bitmap_file
);
4561 mddev
->bitmap_file
= NULL
;
4568 * set_array_info is used two different ways
4569 * The original usage is when creating a new array.
4570 * In this usage, raid_disks is > 0 and it together with
4571 * level, size, not_persistent,layout,chunksize determine the
4572 * shape of the array.
4573 * This will always create an array with a type-0.90.0 superblock.
4574 * The newer usage is when assembling an array.
4575 * In this case raid_disks will be 0, and the major_version field is
4576 * use to determine which style super-blocks are to be found on the devices.
4577 * The minor and patch _version numbers are also kept incase the
4578 * super_block handler wishes to interpret them.
4580 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4583 if (info
->raid_disks
== 0) {
4584 /* just setting version number for superblock loading */
4585 if (info
->major_version
< 0 ||
4586 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4587 super_types
[info
->major_version
].name
== NULL
) {
4588 /* maybe try to auto-load a module? */
4590 "md: superblock version %d not known\n",
4591 info
->major_version
);
4594 mddev
->major_version
= info
->major_version
;
4595 mddev
->minor_version
= info
->minor_version
;
4596 mddev
->patch_version
= info
->patch_version
;
4597 mddev
->persistent
= !info
->not_persistent
;
4600 mddev
->major_version
= MD_MAJOR_VERSION
;
4601 mddev
->minor_version
= MD_MINOR_VERSION
;
4602 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4603 mddev
->ctime
= get_seconds();
4605 mddev
->level
= info
->level
;
4606 mddev
->clevel
[0] = 0;
4607 mddev
->size
= info
->size
;
4608 mddev
->raid_disks
= info
->raid_disks
;
4609 /* don't set md_minor, it is determined by which /dev/md* was
4612 if (info
->state
& (1<<MD_SB_CLEAN
))
4613 mddev
->recovery_cp
= MaxSector
;
4615 mddev
->recovery_cp
= 0;
4616 mddev
->persistent
= ! info
->not_persistent
;
4617 mddev
->external
= 0;
4619 mddev
->layout
= info
->layout
;
4620 mddev
->chunk_size
= info
->chunk_size
;
4622 mddev
->max_disks
= MD_SB_DISKS
;
4624 if (mddev
->persistent
)
4626 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4628 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4629 mddev
->bitmap_offset
= 0;
4631 mddev
->reshape_position
= MaxSector
;
4634 * Generate a 128 bit UUID
4636 get_random_bytes(mddev
->uuid
, 16);
4638 mddev
->new_level
= mddev
->level
;
4639 mddev
->new_chunk
= mddev
->chunk_size
;
4640 mddev
->new_layout
= mddev
->layout
;
4641 mddev
->delta_disks
= 0;
4646 static int update_size(mddev_t
*mddev
, unsigned long size
)
4650 struct list_head
*tmp
;
4651 int fit
= (size
== 0);
4653 if (mddev
->pers
->resize
== NULL
)
4655 /* The "size" is the amount of each device that is used.
4656 * This can only make sense for arrays with redundancy.
4657 * linear and raid0 always use whatever space is available
4658 * We can only consider changing the size if no resync
4659 * or reconstruction is happening, and if the new size
4660 * is acceptable. It must fit before the sb_offset or,
4661 * if that is <data_offset, it must fit before the
4662 * size of each device.
4663 * If size is zero, we find the largest size that fits.
4665 if (mddev
->sync_thread
)
4667 rdev_for_each(rdev
, tmp
, mddev
) {
4669 avail
= rdev
->size
* 2;
4671 if (fit
&& (size
== 0 || size
> avail
/2))
4673 if (avail
< ((sector_t
)size
<< 1))
4676 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4678 struct block_device
*bdev
;
4680 bdev
= bdget_disk(mddev
->gendisk
, 0);
4682 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4683 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4684 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4691 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4694 /* change the number of raid disks */
4695 if (mddev
->pers
->check_reshape
== NULL
)
4697 if (raid_disks
<= 0 ||
4698 raid_disks
>= mddev
->max_disks
)
4700 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4702 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4704 rv
= mddev
->pers
->check_reshape(mddev
);
4710 * update_array_info is used to change the configuration of an
4712 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4713 * fields in the info are checked against the array.
4714 * Any differences that cannot be handled will cause an error.
4715 * Normally, only one change can be managed at a time.
4717 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4723 /* calculate expected state,ignoring low bits */
4724 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4725 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4727 if (mddev
->major_version
!= info
->major_version
||
4728 mddev
->minor_version
!= info
->minor_version
||
4729 /* mddev->patch_version != info->patch_version || */
4730 mddev
->ctime
!= info
->ctime
||
4731 mddev
->level
!= info
->level
||
4732 /* mddev->layout != info->layout || */
4733 !mddev
->persistent
!= info
->not_persistent
||
4734 mddev
->chunk_size
!= info
->chunk_size
||
4735 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4736 ((state
^info
->state
) & 0xfffffe00)
4739 /* Check there is only one change */
4740 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4741 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4742 if (mddev
->layout
!= info
->layout
) cnt
++;
4743 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4744 if (cnt
== 0) return 0;
4745 if (cnt
> 1) return -EINVAL
;
4747 if (mddev
->layout
!= info
->layout
) {
4749 * we don't need to do anything at the md level, the
4750 * personality will take care of it all.
4752 if (mddev
->pers
->reconfig
== NULL
)
4755 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4757 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4758 rv
= update_size(mddev
, info
->size
);
4760 if (mddev
->raid_disks
!= info
->raid_disks
)
4761 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4763 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4764 if (mddev
->pers
->quiesce
== NULL
)
4766 if (mddev
->recovery
|| mddev
->sync_thread
)
4768 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4769 /* add the bitmap */
4772 if (mddev
->default_bitmap_offset
== 0)
4774 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4775 mddev
->pers
->quiesce(mddev
, 1);
4776 rv
= bitmap_create(mddev
);
4778 bitmap_destroy(mddev
);
4779 mddev
->pers
->quiesce(mddev
, 0);
4781 /* remove the bitmap */
4784 if (mddev
->bitmap
->file
)
4786 mddev
->pers
->quiesce(mddev
, 1);
4787 bitmap_destroy(mddev
);
4788 mddev
->pers
->quiesce(mddev
, 0);
4789 mddev
->bitmap_offset
= 0;
4792 md_update_sb(mddev
, 1);
4796 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4800 if (mddev
->pers
== NULL
)
4803 rdev
= find_rdev(mddev
, dev
);
4807 md_error(mddev
, rdev
);
4812 * We have a problem here : there is no easy way to give a CHS
4813 * virtual geometry. We currently pretend that we have a 2 heads
4814 * 4 sectors (with a BIG number of cylinders...). This drives
4815 * dosfs just mad... ;-)
4817 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4819 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4823 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4827 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4828 unsigned int cmd
, unsigned long arg
)
4831 void __user
*argp
= (void __user
*)arg
;
4832 mddev_t
*mddev
= NULL
;
4834 if (!capable(CAP_SYS_ADMIN
))
4838 * Commands dealing with the RAID driver but not any
4844 err
= get_version(argp
);
4847 case PRINT_RAID_DEBUG
:
4855 autostart_arrays(arg
);
4862 * Commands creating/starting a new array:
4865 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4872 err
= mddev_lock(mddev
);
4875 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4882 case SET_ARRAY_INFO
:
4884 mdu_array_info_t info
;
4886 memset(&info
, 0, sizeof(info
));
4887 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4892 err
= update_array_info(mddev
, &info
);
4894 printk(KERN_WARNING
"md: couldn't update"
4895 " array info. %d\n", err
);
4900 if (!list_empty(&mddev
->disks
)) {
4902 "md: array %s already has disks!\n",
4907 if (mddev
->raid_disks
) {
4909 "md: array %s already initialised!\n",
4914 err
= set_array_info(mddev
, &info
);
4916 printk(KERN_WARNING
"md: couldn't set"
4917 " array info. %d\n", err
);
4927 * Commands querying/configuring an existing array:
4929 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4930 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4931 if ((!mddev
->raid_disks
&& !mddev
->external
)
4932 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4933 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4934 && cmd
!= GET_BITMAP_FILE
) {
4940 * Commands even a read-only array can execute:
4944 case GET_ARRAY_INFO
:
4945 err
= get_array_info(mddev
, argp
);
4948 case GET_BITMAP_FILE
:
4949 err
= get_bitmap_file(mddev
, argp
);
4953 err
= get_disk_info(mddev
, argp
);
4956 case RESTART_ARRAY_RW
:
4957 err
= restart_array(mddev
);
4961 err
= do_md_stop (mddev
, 0);
4965 err
= do_md_stop (mddev
, 1);
4971 * The remaining ioctls are changing the state of the
4972 * superblock, so we do not allow them on read-only arrays.
4973 * However non-MD ioctls (e.g. get-size) will still come through
4974 * here and hit the 'default' below, so only disallow
4975 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4977 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
4978 if (mddev
->ro
== 2) {
4980 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
4981 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4982 md_wakeup_thread(mddev
->thread
);
4993 mdu_disk_info_t info
;
4994 if (copy_from_user(&info
, argp
, sizeof(info
)))
4997 err
= add_new_disk(mddev
, &info
);
5001 case HOT_REMOVE_DISK
:
5002 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5006 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5009 case SET_DISK_FAULTY
:
5010 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5014 err
= do_md_run (mddev
);
5017 case SET_BITMAP_FILE
:
5018 err
= set_bitmap_file(mddev
, (int)arg
);
5028 mddev_unlock(mddev
);
5038 static int md_open(struct inode
*inode
, struct file
*file
)
5041 * Succeed if we can lock the mddev, which confirms that
5042 * it isn't being stopped right now.
5044 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
5047 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5052 mddev_unlock(mddev
);
5054 check_disk_change(inode
->i_bdev
);
5059 static int md_release(struct inode
*inode
, struct file
* file
)
5061 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
5069 static int md_media_changed(struct gendisk
*disk
)
5071 mddev_t
*mddev
= disk
->private_data
;
5073 return mddev
->changed
;
5076 static int md_revalidate(struct gendisk
*disk
)
5078 mddev_t
*mddev
= disk
->private_data
;
5083 static struct block_device_operations md_fops
=
5085 .owner
= THIS_MODULE
,
5087 .release
= md_release
,
5089 .getgeo
= md_getgeo
,
5090 .media_changed
= md_media_changed
,
5091 .revalidate_disk
= md_revalidate
,
5094 static int md_thread(void * arg
)
5096 mdk_thread_t
*thread
= arg
;
5099 * md_thread is a 'system-thread', it's priority should be very
5100 * high. We avoid resource deadlocks individually in each
5101 * raid personality. (RAID5 does preallocation) We also use RR and
5102 * the very same RT priority as kswapd, thus we will never get
5103 * into a priority inversion deadlock.
5105 * we definitely have to have equal or higher priority than
5106 * bdflush, otherwise bdflush will deadlock if there are too
5107 * many dirty RAID5 blocks.
5110 allow_signal(SIGKILL
);
5111 while (!kthread_should_stop()) {
5113 /* We need to wait INTERRUPTIBLE so that
5114 * we don't add to the load-average.
5115 * That means we need to be sure no signals are
5118 if (signal_pending(current
))
5119 flush_signals(current
);
5121 wait_event_interruptible_timeout
5123 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5124 || kthread_should_stop(),
5127 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5129 thread
->run(thread
->mddev
);
5135 void md_wakeup_thread(mdk_thread_t
*thread
)
5138 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5139 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5140 wake_up(&thread
->wqueue
);
5144 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5147 mdk_thread_t
*thread
;
5149 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5153 init_waitqueue_head(&thread
->wqueue
);
5156 thread
->mddev
= mddev
;
5157 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5158 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5159 if (IS_ERR(thread
->tsk
)) {
5166 void md_unregister_thread(mdk_thread_t
*thread
)
5168 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5170 kthread_stop(thread
->tsk
);
5174 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5181 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5184 if (mddev
->external
)
5185 set_bit(Blocked
, &rdev
->flags
);
5187 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5189 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5190 __builtin_return_address(0),__builtin_return_address(1),
5191 __builtin_return_address(2),__builtin_return_address(3));
5195 if (!mddev
->pers
->error_handler
)
5197 mddev
->pers
->error_handler(mddev
,rdev
);
5198 if (mddev
->degraded
)
5199 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5200 set_bit(StateChanged
, &rdev
->flags
);
5201 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5202 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5203 md_wakeup_thread(mddev
->thread
);
5204 md_new_event_inintr(mddev
);
5207 /* seq_file implementation /proc/mdstat */
5209 static void status_unused(struct seq_file
*seq
)
5213 struct list_head
*tmp
;
5215 seq_printf(seq
, "unused devices: ");
5217 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
) {
5218 char b
[BDEVNAME_SIZE
];
5220 seq_printf(seq
, "%s ",
5221 bdevname(rdev
->bdev
,b
));
5224 seq_printf(seq
, "<none>");
5226 seq_printf(seq
, "\n");
5230 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5232 sector_t max_blocks
, resync
, res
;
5233 unsigned long dt
, db
, rt
;
5235 unsigned int per_milli
;
5237 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5239 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5240 max_blocks
= mddev
->resync_max_sectors
>> 1;
5242 max_blocks
= mddev
->size
;
5245 * Should not happen.
5251 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5252 * in a sector_t, and (max_blocks>>scale) will fit in a
5253 * u32, as those are the requirements for sector_div.
5254 * Thus 'scale' must be at least 10
5257 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5258 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5261 res
= (resync
>>scale
)*1000;
5262 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5266 int i
, x
= per_milli
/50, y
= 20-x
;
5267 seq_printf(seq
, "[");
5268 for (i
= 0; i
< x
; i
++)
5269 seq_printf(seq
, "=");
5270 seq_printf(seq
, ">");
5271 for (i
= 0; i
< y
; i
++)
5272 seq_printf(seq
, ".");
5273 seq_printf(seq
, "] ");
5275 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5276 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5278 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5280 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5281 "resync" : "recovery"))),
5282 per_milli
/10, per_milli
% 10,
5283 (unsigned long long) resync
,
5284 (unsigned long long) max_blocks
);
5287 * We do not want to overflow, so the order of operands and
5288 * the * 100 / 100 trick are important. We do a +1 to be
5289 * safe against division by zero. We only estimate anyway.
5291 * dt: time from mark until now
5292 * db: blocks written from mark until now
5293 * rt: remaining time
5295 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5297 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5298 - mddev
->resync_mark_cnt
;
5299 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5301 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5303 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5306 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5308 struct list_head
*tmp
;
5318 spin_lock(&all_mddevs_lock
);
5319 list_for_each(tmp
,&all_mddevs
)
5321 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5323 spin_unlock(&all_mddevs_lock
);
5326 spin_unlock(&all_mddevs_lock
);
5328 return (void*)2;/* tail */
5332 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5334 struct list_head
*tmp
;
5335 mddev_t
*next_mddev
, *mddev
= v
;
5341 spin_lock(&all_mddevs_lock
);
5343 tmp
= all_mddevs
.next
;
5345 tmp
= mddev
->all_mddevs
.next
;
5346 if (tmp
!= &all_mddevs
)
5347 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5349 next_mddev
= (void*)2;
5352 spin_unlock(&all_mddevs_lock
);
5360 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5364 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5368 struct mdstat_info
{
5372 static int md_seq_show(struct seq_file
*seq
, void *v
)
5376 struct list_head
*tmp2
;
5378 struct mdstat_info
*mi
= seq
->private;
5379 struct bitmap
*bitmap
;
5381 if (v
== (void*)1) {
5382 struct mdk_personality
*pers
;
5383 seq_printf(seq
, "Personalities : ");
5384 spin_lock(&pers_lock
);
5385 list_for_each_entry(pers
, &pers_list
, list
)
5386 seq_printf(seq
, "[%s] ", pers
->name
);
5388 spin_unlock(&pers_lock
);
5389 seq_printf(seq
, "\n");
5390 mi
->event
= atomic_read(&md_event_count
);
5393 if (v
== (void*)2) {
5398 if (mddev_lock(mddev
) < 0)
5401 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5402 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5403 mddev
->pers
? "" : "in");
5406 seq_printf(seq
, " (read-only)");
5408 seq_printf(seq
, " (auto-read-only)");
5409 seq_printf(seq
, " %s", mddev
->pers
->name
);
5413 rdev_for_each(rdev
, tmp2
, mddev
) {
5414 char b
[BDEVNAME_SIZE
];
5415 seq_printf(seq
, " %s[%d]",
5416 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5417 if (test_bit(WriteMostly
, &rdev
->flags
))
5418 seq_printf(seq
, "(W)");
5419 if (test_bit(Faulty
, &rdev
->flags
)) {
5420 seq_printf(seq
, "(F)");
5422 } else if (rdev
->raid_disk
< 0)
5423 seq_printf(seq
, "(S)"); /* spare */
5427 if (!list_empty(&mddev
->disks
)) {
5429 seq_printf(seq
, "\n %llu blocks",
5430 (unsigned long long)mddev
->array_size
);
5432 seq_printf(seq
, "\n %llu blocks",
5433 (unsigned long long)size
);
5435 if (mddev
->persistent
) {
5436 if (mddev
->major_version
!= 0 ||
5437 mddev
->minor_version
!= 90) {
5438 seq_printf(seq
," super %d.%d",
5439 mddev
->major_version
,
5440 mddev
->minor_version
);
5442 } else if (mddev
->external
)
5443 seq_printf(seq
, " super external:%s",
5444 mddev
->metadata_type
);
5446 seq_printf(seq
, " super non-persistent");
5449 mddev
->pers
->status (seq
, mddev
);
5450 seq_printf(seq
, "\n ");
5451 if (mddev
->pers
->sync_request
) {
5452 if (mddev
->curr_resync
> 2) {
5453 status_resync (seq
, mddev
);
5454 seq_printf(seq
, "\n ");
5455 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5456 seq_printf(seq
, "\tresync=DELAYED\n ");
5457 else if (mddev
->recovery_cp
< MaxSector
)
5458 seq_printf(seq
, "\tresync=PENDING\n ");
5461 seq_printf(seq
, "\n ");
5463 if ((bitmap
= mddev
->bitmap
)) {
5464 unsigned long chunk_kb
;
5465 unsigned long flags
;
5466 spin_lock_irqsave(&bitmap
->lock
, flags
);
5467 chunk_kb
= bitmap
->chunksize
>> 10;
5468 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5470 bitmap
->pages
- bitmap
->missing_pages
,
5472 (bitmap
->pages
- bitmap
->missing_pages
)
5473 << (PAGE_SHIFT
- 10),
5474 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5475 chunk_kb
? "KB" : "B");
5477 seq_printf(seq
, ", file: ");
5478 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5481 seq_printf(seq
, "\n");
5482 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5485 seq_printf(seq
, "\n");
5487 mddev_unlock(mddev
);
5492 static struct seq_operations md_seq_ops
= {
5493 .start
= md_seq_start
,
5494 .next
= md_seq_next
,
5495 .stop
= md_seq_stop
,
5496 .show
= md_seq_show
,
5499 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5502 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5506 error
= seq_open(file
, &md_seq_ops
);
5510 struct seq_file
*p
= file
->private_data
;
5512 mi
->event
= atomic_read(&md_event_count
);
5517 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5519 struct seq_file
*m
= filp
->private_data
;
5520 struct mdstat_info
*mi
= m
->private;
5523 poll_wait(filp
, &md_event_waiters
, wait
);
5525 /* always allow read */
5526 mask
= POLLIN
| POLLRDNORM
;
5528 if (mi
->event
!= atomic_read(&md_event_count
))
5529 mask
|= POLLERR
| POLLPRI
;
5533 static const struct file_operations md_seq_fops
= {
5534 .owner
= THIS_MODULE
,
5535 .open
= md_seq_open
,
5537 .llseek
= seq_lseek
,
5538 .release
= seq_release_private
,
5539 .poll
= mdstat_poll
,
5542 int register_md_personality(struct mdk_personality
*p
)
5544 spin_lock(&pers_lock
);
5545 list_add_tail(&p
->list
, &pers_list
);
5546 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5547 spin_unlock(&pers_lock
);
5551 int unregister_md_personality(struct mdk_personality
*p
)
5553 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5554 spin_lock(&pers_lock
);
5555 list_del_init(&p
->list
);
5556 spin_unlock(&pers_lock
);
5560 static int is_mddev_idle(mddev_t
*mddev
)
5563 struct list_head
*tmp
;
5568 rdev_for_each(rdev
, tmp
, mddev
) {
5569 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5570 curr_events
= disk_stat_read(disk
, sectors
[0]) +
5571 disk_stat_read(disk
, sectors
[1]) -
5572 atomic_read(&disk
->sync_io
);
5573 /* sync IO will cause sync_io to increase before the disk_stats
5574 * as sync_io is counted when a request starts, and
5575 * disk_stats is counted when it completes.
5576 * So resync activity will cause curr_events to be smaller than
5577 * when there was no such activity.
5578 * non-sync IO will cause disk_stat to increase without
5579 * increasing sync_io so curr_events will (eventually)
5580 * be larger than it was before. Once it becomes
5581 * substantially larger, the test below will cause
5582 * the array to appear non-idle, and resync will slow
5584 * If there is a lot of outstanding resync activity when
5585 * we set last_event to curr_events, then all that activity
5586 * completing might cause the array to appear non-idle
5587 * and resync will be slowed down even though there might
5588 * not have been non-resync activity. This will only
5589 * happen once though. 'last_events' will soon reflect
5590 * the state where there is little or no outstanding
5591 * resync requests, and further resync activity will
5592 * always make curr_events less than last_events.
5595 if (curr_events
- rdev
->last_events
> 4096) {
5596 rdev
->last_events
= curr_events
;
5603 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5605 /* another "blocks" (512byte) blocks have been synced */
5606 atomic_sub(blocks
, &mddev
->recovery_active
);
5607 wake_up(&mddev
->recovery_wait
);
5609 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5610 md_wakeup_thread(mddev
->thread
);
5611 // stop recovery, signal do_sync ....
5616 /* md_write_start(mddev, bi)
5617 * If we need to update some array metadata (e.g. 'active' flag
5618 * in superblock) before writing, schedule a superblock update
5619 * and wait for it to complete.
5621 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5624 if (bio_data_dir(bi
) != WRITE
)
5627 BUG_ON(mddev
->ro
== 1);
5628 if (mddev
->ro
== 2) {
5629 /* need to switch to read/write */
5631 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5632 md_wakeup_thread(mddev
->thread
);
5633 md_wakeup_thread(mddev
->sync_thread
);
5636 atomic_inc(&mddev
->writes_pending
);
5637 if (mddev
->safemode
== 1)
5638 mddev
->safemode
= 0;
5639 if (mddev
->in_sync
) {
5640 spin_lock_irq(&mddev
->write_lock
);
5641 if (mddev
->in_sync
) {
5643 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5644 md_wakeup_thread(mddev
->thread
);
5647 spin_unlock_irq(&mddev
->write_lock
);
5650 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5651 wait_event(mddev
->sb_wait
,
5652 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5653 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5656 void md_write_end(mddev_t
*mddev
)
5658 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5659 if (mddev
->safemode
== 2)
5660 md_wakeup_thread(mddev
->thread
);
5661 else if (mddev
->safemode_delay
)
5662 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5666 /* md_allow_write(mddev)
5667 * Calling this ensures that the array is marked 'active' so that writes
5668 * may proceed without blocking. It is important to call this before
5669 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5670 * Must be called with mddev_lock held.
5672 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5673 * is dropped, so return -EAGAIN after notifying userspace.
5675 int md_allow_write(mddev_t
*mddev
)
5681 if (!mddev
->pers
->sync_request
)
5684 spin_lock_irq(&mddev
->write_lock
);
5685 if (mddev
->in_sync
) {
5687 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5688 if (mddev
->safemode_delay
&&
5689 mddev
->safemode
== 0)
5690 mddev
->safemode
= 1;
5691 spin_unlock_irq(&mddev
->write_lock
);
5692 md_update_sb(mddev
, 0);
5693 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5695 spin_unlock_irq(&mddev
->write_lock
);
5697 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
5702 EXPORT_SYMBOL_GPL(md_allow_write
);
5704 #define SYNC_MARKS 10
5705 #define SYNC_MARK_STEP (3*HZ)
5706 void md_do_sync(mddev_t
*mddev
)
5709 unsigned int currspeed
= 0,
5711 sector_t max_sectors
,j
, io_sectors
;
5712 unsigned long mark
[SYNC_MARKS
];
5713 sector_t mark_cnt
[SYNC_MARKS
];
5715 struct list_head
*tmp
;
5716 sector_t last_check
;
5718 struct list_head
*rtmp
;
5722 /* just incase thread restarts... */
5723 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5725 if (mddev
->ro
) /* never try to sync a read-only array */
5728 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5729 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5730 desc
= "data-check";
5731 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5732 desc
= "requested-resync";
5735 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5740 /* we overload curr_resync somewhat here.
5741 * 0 == not engaged in resync at all
5742 * 2 == checking that there is no conflict with another sync
5743 * 1 == like 2, but have yielded to allow conflicting resync to
5745 * other == active in resync - this many blocks
5747 * Before starting a resync we must have set curr_resync to
5748 * 2, and then checked that every "conflicting" array has curr_resync
5749 * less than ours. When we find one that is the same or higher
5750 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5751 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5752 * This will mean we have to start checking from the beginning again.
5757 mddev
->curr_resync
= 2;
5760 if (kthread_should_stop()) {
5761 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5764 for_each_mddev(mddev2
, tmp
) {
5765 if (mddev2
== mddev
)
5767 if (!mddev
->parallel_resync
5768 && mddev2
->curr_resync
5769 && match_mddev_units(mddev
, mddev2
)) {
5771 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5772 /* arbitrarily yield */
5773 mddev
->curr_resync
= 1;
5774 wake_up(&resync_wait
);
5776 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5777 /* no need to wait here, we can wait the next
5778 * time 'round when curr_resync == 2
5781 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5782 if (!kthread_should_stop() &&
5783 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5784 printk(KERN_INFO
"md: delaying %s of %s"
5785 " until %s has finished (they"
5786 " share one or more physical units)\n",
5787 desc
, mdname(mddev
), mdname(mddev2
));
5790 finish_wait(&resync_wait
, &wq
);
5793 finish_wait(&resync_wait
, &wq
);
5796 } while (mddev
->curr_resync
< 2);
5799 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5800 /* resync follows the size requested by the personality,
5801 * which defaults to physical size, but can be virtual size
5803 max_sectors
= mddev
->resync_max_sectors
;
5804 mddev
->resync_mismatches
= 0;
5805 /* we don't use the checkpoint if there's a bitmap */
5806 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5807 j
= mddev
->resync_min
;
5808 else if (!mddev
->bitmap
)
5809 j
= mddev
->recovery_cp
;
5811 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5812 max_sectors
= mddev
->size
<< 1;
5814 /* recovery follows the physical size of devices */
5815 max_sectors
= mddev
->size
<< 1;
5817 rdev_for_each(rdev
, rtmp
, mddev
)
5818 if (rdev
->raid_disk
>= 0 &&
5819 !test_bit(Faulty
, &rdev
->flags
) &&
5820 !test_bit(In_sync
, &rdev
->flags
) &&
5821 rdev
->recovery_offset
< j
)
5822 j
= rdev
->recovery_offset
;
5825 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5826 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5827 " %d KB/sec/disk.\n", speed_min(mddev
));
5828 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5829 "(but not more than %d KB/sec) for %s.\n",
5830 speed_max(mddev
), desc
);
5832 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5835 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5837 mark_cnt
[m
] = io_sectors
;
5840 mddev
->resync_mark
= mark
[last_mark
];
5841 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5844 * Tune reconstruction:
5846 window
= 32*(PAGE_SIZE
/512);
5847 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5848 window
/2,(unsigned long long) max_sectors
/2);
5850 atomic_set(&mddev
->recovery_active
, 0);
5855 "md: resuming %s of %s from checkpoint.\n",
5856 desc
, mdname(mddev
));
5857 mddev
->curr_resync
= j
;
5860 while (j
< max_sectors
) {
5864 if (j
>= mddev
->resync_max
) {
5865 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5866 wait_event(mddev
->recovery_wait
,
5867 mddev
->resync_max
> j
5868 || kthread_should_stop());
5870 if (kthread_should_stop())
5872 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5873 currspeed
< speed_min(mddev
));
5875 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5879 if (!skipped
) { /* actual IO requested */
5880 io_sectors
+= sectors
;
5881 atomic_add(sectors
, &mddev
->recovery_active
);
5885 if (j
>1) mddev
->curr_resync
= j
;
5886 mddev
->curr_mark_cnt
= io_sectors
;
5887 if (last_check
== 0)
5888 /* this is the earliers that rebuilt will be
5889 * visible in /proc/mdstat
5891 md_new_event(mddev
);
5893 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5896 last_check
= io_sectors
;
5898 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5902 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5904 int next
= (last_mark
+1) % SYNC_MARKS
;
5906 mddev
->resync_mark
= mark
[next
];
5907 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5908 mark
[next
] = jiffies
;
5909 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5914 if (kthread_should_stop())
5919 * this loop exits only if either when we are slower than
5920 * the 'hard' speed limit, or the system was IO-idle for
5922 * the system might be non-idle CPU-wise, but we only care
5923 * about not overloading the IO subsystem. (things like an
5924 * e2fsck being done on the RAID array should execute fast)
5926 blk_unplug(mddev
->queue
);
5929 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5930 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5932 if (currspeed
> speed_min(mddev
)) {
5933 if ((currspeed
> speed_max(mddev
)) ||
5934 !is_mddev_idle(mddev
)) {
5940 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5942 * this also signals 'finished resyncing' to md_stop
5945 blk_unplug(mddev
->queue
);
5947 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5949 /* tell personality that we are finished */
5950 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5952 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5953 mddev
->curr_resync
> 2) {
5954 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5955 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5956 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5958 "md: checkpointing %s of %s.\n",
5959 desc
, mdname(mddev
));
5960 mddev
->recovery_cp
= mddev
->curr_resync
;
5963 mddev
->recovery_cp
= MaxSector
;
5965 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5966 mddev
->curr_resync
= MaxSector
;
5967 rdev_for_each(rdev
, rtmp
, mddev
)
5968 if (rdev
->raid_disk
>= 0 &&
5969 !test_bit(Faulty
, &rdev
->flags
) &&
5970 !test_bit(In_sync
, &rdev
->flags
) &&
5971 rdev
->recovery_offset
< mddev
->curr_resync
)
5972 rdev
->recovery_offset
= mddev
->curr_resync
;
5975 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5978 mddev
->curr_resync
= 0;
5979 mddev
->resync_min
= 0;
5980 mddev
->resync_max
= MaxSector
;
5981 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5982 wake_up(&resync_wait
);
5983 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5984 md_wakeup_thread(mddev
->thread
);
5989 * got a signal, exit.
5992 "md: md_do_sync() got signal ... exiting\n");
5993 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5997 EXPORT_SYMBOL_GPL(md_do_sync
);
6000 static int remove_and_add_spares(mddev_t
*mddev
)
6003 struct list_head
*rtmp
;
6006 rdev_for_each(rdev
, rtmp
, mddev
)
6007 if (rdev
->raid_disk
>= 0 &&
6008 !test_bit(Blocked
, &rdev
->flags
) &&
6009 (test_bit(Faulty
, &rdev
->flags
) ||
6010 ! test_bit(In_sync
, &rdev
->flags
)) &&
6011 atomic_read(&rdev
->nr_pending
)==0) {
6012 if (mddev
->pers
->hot_remove_disk(
6013 mddev
, rdev
->raid_disk
)==0) {
6015 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6016 sysfs_remove_link(&mddev
->kobj
, nm
);
6017 rdev
->raid_disk
= -1;
6021 if (mddev
->degraded
) {
6022 rdev_for_each(rdev
, rtmp
, mddev
) {
6023 if (rdev
->raid_disk
>= 0 &&
6024 !test_bit(In_sync
, &rdev
->flags
))
6026 if (rdev
->raid_disk
< 0
6027 && !test_bit(Faulty
, &rdev
->flags
)) {
6028 rdev
->recovery_offset
= 0;
6030 hot_add_disk(mddev
, rdev
) == 0) {
6032 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6033 if (sysfs_create_link(&mddev
->kobj
,
6036 "md: cannot register "
6040 md_new_event(mddev
);
6049 * This routine is regularly called by all per-raid-array threads to
6050 * deal with generic issues like resync and super-block update.
6051 * Raid personalities that don't have a thread (linear/raid0) do not
6052 * need this as they never do any recovery or update the superblock.
6054 * It does not do any resync itself, but rather "forks" off other threads
6055 * to do that as needed.
6056 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6057 * "->recovery" and create a thread at ->sync_thread.
6058 * When the thread finishes it sets MD_RECOVERY_DONE
6059 * and wakeups up this thread which will reap the thread and finish up.
6060 * This thread also removes any faulty devices (with nr_pending == 0).
6062 * The overall approach is:
6063 * 1/ if the superblock needs updating, update it.
6064 * 2/ If a recovery thread is running, don't do anything else.
6065 * 3/ If recovery has finished, clean up, possibly marking spares active.
6066 * 4/ If there are any faulty devices, remove them.
6067 * 5/ If array is degraded, try to add spares devices
6068 * 6/ If array has spares or is not in-sync, start a resync thread.
6070 void md_check_recovery(mddev_t
*mddev
)
6073 struct list_head
*rtmp
;
6077 bitmap_daemon_work(mddev
->bitmap
);
6082 if (signal_pending(current
)) {
6083 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6084 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6086 mddev
->safemode
= 2;
6088 flush_signals(current
);
6092 (mddev
->flags
&& !mddev
->external
) ||
6093 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6094 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6095 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6096 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6097 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6101 if (mddev_trylock(mddev
)) {
6104 if (!mddev
->external
) {
6106 spin_lock_irq(&mddev
->write_lock
);
6107 if (mddev
->safemode
&&
6108 !atomic_read(&mddev
->writes_pending
) &&
6110 mddev
->recovery_cp
== MaxSector
) {
6113 if (mddev
->persistent
)
6114 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6116 if (mddev
->safemode
== 1)
6117 mddev
->safemode
= 0;
6118 spin_unlock_irq(&mddev
->write_lock
);
6120 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
6124 md_update_sb(mddev
, 0);
6126 rdev_for_each(rdev
, rtmp
, mddev
)
6127 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6128 sysfs_notify(&rdev
->kobj
, NULL
, "state");
6131 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6132 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6133 /* resync/recovery still happening */
6134 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6137 if (mddev
->sync_thread
) {
6138 /* resync has finished, collect result */
6139 md_unregister_thread(mddev
->sync_thread
);
6140 mddev
->sync_thread
= NULL
;
6141 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6143 /* activate any spares */
6144 if (mddev
->pers
->spare_active(mddev
))
6145 sysfs_notify(&mddev
->kobj
, NULL
,
6148 md_update_sb(mddev
, 1);
6150 /* if array is no-longer degraded, then any saved_raid_disk
6151 * information must be scrapped
6153 if (!mddev
->degraded
)
6154 rdev_for_each(rdev
, rtmp
, mddev
)
6155 rdev
->saved_raid_disk
= -1;
6157 mddev
->recovery
= 0;
6158 /* flag recovery needed just to double check */
6159 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6160 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6161 md_new_event(mddev
);
6164 /* Set RUNNING before clearing NEEDED to avoid
6165 * any transients in the value of "sync_action".
6167 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6168 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6169 /* Clear some bits that don't mean anything, but
6172 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6173 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6175 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6177 /* no recovery is running.
6178 * remove any failed drives, then
6179 * add spares if possible.
6180 * Spare are also removed and re-added, to allow
6181 * the personality to fail the re-add.
6184 if (mddev
->reshape_position
!= MaxSector
) {
6185 if (mddev
->pers
->check_reshape(mddev
) != 0)
6186 /* Cannot proceed */
6188 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6189 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6190 } else if ((spares
= remove_and_add_spares(mddev
))) {
6191 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6192 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6193 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6194 } else if (mddev
->recovery_cp
< MaxSector
) {
6195 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6196 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6197 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6198 /* nothing to be done ... */
6201 if (mddev
->pers
->sync_request
) {
6202 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6203 /* We are adding a device or devices to an array
6204 * which has the bitmap stored on all devices.
6205 * So make sure all bitmap pages get written
6207 bitmap_write_all(mddev
->bitmap
);
6209 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6212 if (!mddev
->sync_thread
) {
6213 printk(KERN_ERR
"%s: could not start resync"
6216 /* leave the spares where they are, it shouldn't hurt */
6217 mddev
->recovery
= 0;
6219 md_wakeup_thread(mddev
->sync_thread
);
6220 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6221 md_new_event(mddev
);
6224 if (!mddev
->sync_thread
) {
6225 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6226 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6228 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6230 mddev_unlock(mddev
);
6234 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6236 sysfs_notify(&rdev
->kobj
, NULL
, "state");
6237 wait_event_timeout(rdev
->blocked_wait
,
6238 !test_bit(Blocked
, &rdev
->flags
),
6239 msecs_to_jiffies(5000));
6240 rdev_dec_pending(rdev
, mddev
);
6242 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6244 static int md_notify_reboot(struct notifier_block
*this,
6245 unsigned long code
, void *x
)
6247 struct list_head
*tmp
;
6250 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6252 printk(KERN_INFO
"md: stopping all md devices.\n");
6254 for_each_mddev(mddev
, tmp
)
6255 if (mddev_trylock(mddev
)) {
6256 do_md_stop (mddev
, 1);
6257 mddev_unlock(mddev
);
6260 * certain more exotic SCSI devices are known to be
6261 * volatile wrt too early system reboots. While the
6262 * right place to handle this issue is the given
6263 * driver, we do want to have a safe RAID driver ...
6270 static struct notifier_block md_notifier
= {
6271 .notifier_call
= md_notify_reboot
,
6273 .priority
= INT_MAX
, /* before any real devices */
6276 static void md_geninit(void)
6278 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6280 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6283 static int __init
md_init(void)
6285 if (register_blkdev(MAJOR_NR
, "md"))
6287 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6288 unregister_blkdev(MAJOR_NR
, "md");
6291 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6292 md_probe
, NULL
, NULL
);
6293 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6294 md_probe
, NULL
, NULL
);
6296 register_reboot_notifier(&md_notifier
);
6297 raid_table_header
= register_sysctl_table(raid_root_table
);
6307 * Searches all registered partitions for autorun RAID arrays
6311 static LIST_HEAD(all_detected_devices
);
6312 struct detected_devices_node
{
6313 struct list_head list
;
6317 void md_autodetect_dev(dev_t dev
)
6319 struct detected_devices_node
*node_detected_dev
;
6321 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6322 if (node_detected_dev
) {
6323 node_detected_dev
->dev
= dev
;
6324 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6326 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6327 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6332 static void autostart_arrays(int part
)
6335 struct detected_devices_node
*node_detected_dev
;
6337 int i_scanned
, i_passed
;
6342 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6344 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6346 node_detected_dev
= list_entry(all_detected_devices
.next
,
6347 struct detected_devices_node
, list
);
6348 list_del(&node_detected_dev
->list
);
6349 dev
= node_detected_dev
->dev
;
6350 kfree(node_detected_dev
);
6351 rdev
= md_import_device(dev
,0, 90);
6355 if (test_bit(Faulty
, &rdev
->flags
)) {
6359 set_bit(AutoDetected
, &rdev
->flags
);
6360 list_add(&rdev
->same_set
, &pending_raid_disks
);
6364 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6365 i_scanned
, i_passed
);
6367 autorun_devices(part
);
6370 #endif /* !MODULE */
6372 static __exit
void md_exit(void)
6375 struct list_head
*tmp
;
6377 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6378 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6380 unregister_blkdev(MAJOR_NR
,"md");
6381 unregister_blkdev(mdp_major
, "mdp");
6382 unregister_reboot_notifier(&md_notifier
);
6383 unregister_sysctl_table(raid_table_header
);
6384 remove_proc_entry("mdstat", NULL
);
6385 for_each_mddev(mddev
, tmp
) {
6386 struct gendisk
*disk
= mddev
->gendisk
;
6389 export_array(mddev
);
6392 mddev
->gendisk
= NULL
;
6397 subsys_initcall(md_init
);
6398 module_exit(md_exit
)
6400 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6402 return sprintf(buffer
, "%d", start_readonly
);
6404 static int set_ro(const char *val
, struct kernel_param
*kp
)
6407 int num
= simple_strtoul(val
, &e
, 10);
6408 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6409 start_readonly
= num
;
6415 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6416 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6419 EXPORT_SYMBOL(register_md_personality
);
6420 EXPORT_SYMBOL(unregister_md_personality
);
6421 EXPORT_SYMBOL(md_error
);
6422 EXPORT_SYMBOL(md_done_sync
);
6423 EXPORT_SYMBOL(md_write_start
);
6424 EXPORT_SYMBOL(md_write_end
);
6425 EXPORT_SYMBOL(md_register_thread
);
6426 EXPORT_SYMBOL(md_unregister_thread
);
6427 EXPORT_SYMBOL(md_wakeup_thread
);
6428 EXPORT_SYMBOL(md_check_recovery
);
6429 MODULE_LICENSE("GPL");
6431 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);