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 /* return the offset of the super block in 512byte sectors */
351 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
353 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
354 return MD_NEW_SIZE_SECTORS(num_sectors
);
357 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
359 sector_t num_sectors
= rdev
->sb_start
;
362 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
366 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
371 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
372 if (!rdev
->sb_page
) {
373 printk(KERN_ALERT
"md: out of memory.\n");
380 static void free_disk_sb(mdk_rdev_t
* rdev
)
383 put_page(rdev
->sb_page
);
385 rdev
->sb_page
= NULL
;
392 static void super_written(struct bio
*bio
, int error
)
394 mdk_rdev_t
*rdev
= bio
->bi_private
;
395 mddev_t
*mddev
= rdev
->mddev
;
397 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
398 printk("md: super_written gets error=%d, uptodate=%d\n",
399 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
400 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
401 md_error(mddev
, rdev
);
404 if (atomic_dec_and_test(&mddev
->pending_writes
))
405 wake_up(&mddev
->sb_wait
);
409 static void super_written_barrier(struct bio
*bio
, int error
)
411 struct bio
*bio2
= bio
->bi_private
;
412 mdk_rdev_t
*rdev
= bio2
->bi_private
;
413 mddev_t
*mddev
= rdev
->mddev
;
415 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
416 error
== -EOPNOTSUPP
) {
418 /* barriers don't appear to be supported :-( */
419 set_bit(BarriersNotsupp
, &rdev
->flags
);
420 mddev
->barriers_work
= 0;
421 spin_lock_irqsave(&mddev
->write_lock
, flags
);
422 bio2
->bi_next
= mddev
->biolist
;
423 mddev
->biolist
= bio2
;
424 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
425 wake_up(&mddev
->sb_wait
);
429 bio
->bi_private
= rdev
;
430 super_written(bio
, error
);
434 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
435 sector_t sector
, int size
, struct page
*page
)
437 /* write first size bytes of page to sector of rdev
438 * Increment mddev->pending_writes before returning
439 * and decrement it on completion, waking up sb_wait
440 * if zero is reached.
441 * If an error occurred, call md_error
443 * As we might need to resubmit the request if BIO_RW_BARRIER
444 * causes ENOTSUPP, we allocate a spare bio...
446 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
447 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
449 bio
->bi_bdev
= rdev
->bdev
;
450 bio
->bi_sector
= sector
;
451 bio_add_page(bio
, page
, size
, 0);
452 bio
->bi_private
= rdev
;
453 bio
->bi_end_io
= super_written
;
456 atomic_inc(&mddev
->pending_writes
);
457 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
459 rw
|= (1<<BIO_RW_BARRIER
);
460 rbio
= bio_clone(bio
, GFP_NOIO
);
461 rbio
->bi_private
= bio
;
462 rbio
->bi_end_io
= super_written_barrier
;
463 submit_bio(rw
, rbio
);
468 void md_super_wait(mddev_t
*mddev
)
470 /* wait for all superblock writes that were scheduled to complete.
471 * if any had to be retried (due to BARRIER problems), retry them
475 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
476 if (atomic_read(&mddev
->pending_writes
)==0)
478 while (mddev
->biolist
) {
480 spin_lock_irq(&mddev
->write_lock
);
481 bio
= mddev
->biolist
;
482 mddev
->biolist
= bio
->bi_next
;
484 spin_unlock_irq(&mddev
->write_lock
);
485 submit_bio(bio
->bi_rw
, bio
);
489 finish_wait(&mddev
->sb_wait
, &wq
);
492 static void bi_complete(struct bio
*bio
, int error
)
494 complete((struct completion
*)bio
->bi_private
);
497 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
498 struct page
*page
, int rw
)
500 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
501 struct completion event
;
504 rw
|= (1 << BIO_RW_SYNC
);
507 bio
->bi_sector
= sector
;
508 bio_add_page(bio
, page
, size
, 0);
509 init_completion(&event
);
510 bio
->bi_private
= &event
;
511 bio
->bi_end_io
= bi_complete
;
513 wait_for_completion(&event
);
515 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
519 EXPORT_SYMBOL_GPL(sync_page_io
);
521 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
523 char b
[BDEVNAME_SIZE
];
524 if (!rdev
->sb_page
) {
532 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
538 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev
->bdev
,b
));
543 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
545 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
546 sb1
->set_uuid1
== sb2
->set_uuid1
&&
547 sb1
->set_uuid2
== sb2
->set_uuid2
&&
548 sb1
->set_uuid3
== sb2
->set_uuid3
;
551 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
554 mdp_super_t
*tmp1
, *tmp2
;
556 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
557 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
559 if (!tmp1
|| !tmp2
) {
561 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
569 * nr_disks is not constant
574 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
582 static u32
md_csum_fold(u32 csum
)
584 csum
= (csum
& 0xffff) + (csum
>> 16);
585 return (csum
& 0xffff) + (csum
>> 16);
588 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
591 u32
*sb32
= (u32
*)sb
;
593 unsigned int disk_csum
, csum
;
595 disk_csum
= sb
->sb_csum
;
598 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
600 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
604 /* This used to use csum_partial, which was wrong for several
605 * reasons including that different results are returned on
606 * different architectures. It isn't critical that we get exactly
607 * the same return value as before (we always csum_fold before
608 * testing, and that removes any differences). However as we
609 * know that csum_partial always returned a 16bit value on
610 * alphas, do a fold to maximise conformity to previous behaviour.
612 sb
->sb_csum
= md_csum_fold(disk_csum
);
614 sb
->sb_csum
= disk_csum
;
621 * Handle superblock details.
622 * We want to be able to handle multiple superblock formats
623 * so we have a common interface to them all, and an array of
624 * different handlers.
625 * We rely on user-space to write the initial superblock, and support
626 * reading and updating of superblocks.
627 * Interface methods are:
628 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
629 * loads and validates a superblock on dev.
630 * if refdev != NULL, compare superblocks on both devices
632 * 0 - dev has a superblock that is compatible with refdev
633 * 1 - dev has a superblock that is compatible and newer than refdev
634 * so dev should be used as the refdev in future
635 * -EINVAL superblock incompatible or invalid
636 * -othererror e.g. -EIO
638 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
639 * Verify that dev is acceptable into mddev.
640 * The first time, mddev->raid_disks will be 0, and data from
641 * dev should be merged in. Subsequent calls check that dev
642 * is new enough. Return 0 or -EINVAL
644 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
645 * Update the superblock for rdev with data in mddev
646 * This does not write to disc.
652 struct module
*owner
;
653 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
655 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
656 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
657 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
658 unsigned long long size
);
662 * load_super for 0.90.0
664 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
666 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
671 * Calculate the position of the superblock (512byte sectors),
672 * it's at the end of the disk.
674 * It also happens to be a multiple of 4Kb.
676 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
678 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
683 bdevname(rdev
->bdev
, b
);
684 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
686 if (sb
->md_magic
!= MD_SB_MAGIC
) {
687 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
692 if (sb
->major_version
!= 0 ||
693 sb
->minor_version
< 90 ||
694 sb
->minor_version
> 91) {
695 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
696 sb
->major_version
, sb
->minor_version
,
701 if (sb
->raid_disks
<= 0)
704 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
705 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
710 rdev
->preferred_minor
= sb
->md_minor
;
711 rdev
->data_offset
= 0;
712 rdev
->sb_size
= MD_SB_BYTES
;
714 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
715 if (sb
->level
!= 1 && sb
->level
!= 4
716 && sb
->level
!= 5 && sb
->level
!= 6
717 && sb
->level
!= 10) {
718 /* FIXME use a better test */
720 "md: bitmaps not supported for this level.\n");
725 if (sb
->level
== LEVEL_MULTIPATH
)
728 rdev
->desc_nr
= sb
->this_disk
.number
;
734 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
735 if (!uuid_equal(refsb
, sb
)) {
736 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
737 b
, bdevname(refdev
->bdev
,b2
));
740 if (!sb_equal(refsb
, sb
)) {
741 printk(KERN_WARNING
"md: %s has same UUID"
742 " but different superblock to %s\n",
743 b
, bdevname(refdev
->bdev
, b2
));
747 ev2
= md_event(refsb
);
753 rdev
->size
= calc_num_sectors(rdev
, sb
->chunk_size
) / 2;
755 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
756 /* "this cannot possibly happen" ... */
764 * validate_super for 0.90.0
766 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
769 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
770 __u64 ev1
= md_event(sb
);
772 rdev
->raid_disk
= -1;
773 clear_bit(Faulty
, &rdev
->flags
);
774 clear_bit(In_sync
, &rdev
->flags
);
775 clear_bit(WriteMostly
, &rdev
->flags
);
776 clear_bit(BarriersNotsupp
, &rdev
->flags
);
778 if (mddev
->raid_disks
== 0) {
779 mddev
->major_version
= 0;
780 mddev
->minor_version
= sb
->minor_version
;
781 mddev
->patch_version
= sb
->patch_version
;
783 mddev
->chunk_size
= sb
->chunk_size
;
784 mddev
->ctime
= sb
->ctime
;
785 mddev
->utime
= sb
->utime
;
786 mddev
->level
= sb
->level
;
787 mddev
->clevel
[0] = 0;
788 mddev
->layout
= sb
->layout
;
789 mddev
->raid_disks
= sb
->raid_disks
;
790 mddev
->size
= sb
->size
;
792 mddev
->bitmap_offset
= 0;
793 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
795 if (mddev
->minor_version
>= 91) {
796 mddev
->reshape_position
= sb
->reshape_position
;
797 mddev
->delta_disks
= sb
->delta_disks
;
798 mddev
->new_level
= sb
->new_level
;
799 mddev
->new_layout
= sb
->new_layout
;
800 mddev
->new_chunk
= sb
->new_chunk
;
802 mddev
->reshape_position
= MaxSector
;
803 mddev
->delta_disks
= 0;
804 mddev
->new_level
= mddev
->level
;
805 mddev
->new_layout
= mddev
->layout
;
806 mddev
->new_chunk
= mddev
->chunk_size
;
809 if (sb
->state
& (1<<MD_SB_CLEAN
))
810 mddev
->recovery_cp
= MaxSector
;
812 if (sb
->events_hi
== sb
->cp_events_hi
&&
813 sb
->events_lo
== sb
->cp_events_lo
) {
814 mddev
->recovery_cp
= sb
->recovery_cp
;
816 mddev
->recovery_cp
= 0;
819 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
820 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
821 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
822 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
824 mddev
->max_disks
= MD_SB_DISKS
;
826 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
827 mddev
->bitmap_file
== NULL
)
828 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
830 } else if (mddev
->pers
== NULL
) {
831 /* Insist on good event counter while assembling */
833 if (ev1
< mddev
->events
)
835 } else if (mddev
->bitmap
) {
836 /* if adding to array with a bitmap, then we can accept an
837 * older device ... but not too old.
839 if (ev1
< mddev
->bitmap
->events_cleared
)
842 if (ev1
< mddev
->events
)
843 /* just a hot-add of a new device, leave raid_disk at -1 */
847 if (mddev
->level
!= LEVEL_MULTIPATH
) {
848 desc
= sb
->disks
+ rdev
->desc_nr
;
850 if (desc
->state
& (1<<MD_DISK_FAULTY
))
851 set_bit(Faulty
, &rdev
->flags
);
852 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
853 desc->raid_disk < mddev->raid_disks */) {
854 set_bit(In_sync
, &rdev
->flags
);
855 rdev
->raid_disk
= desc
->raid_disk
;
857 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
858 set_bit(WriteMostly
, &rdev
->flags
);
859 } else /* MULTIPATH are always insync */
860 set_bit(In_sync
, &rdev
->flags
);
865 * sync_super for 0.90.0
867 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
870 struct list_head
*tmp
;
872 int next_spare
= mddev
->raid_disks
;
875 /* make rdev->sb match mddev data..
878 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
879 * 3/ any empty disks < next_spare become removed
881 * disks[0] gets initialised to REMOVED because
882 * we cannot be sure from other fields if it has
883 * been initialised or not.
886 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
888 rdev
->sb_size
= MD_SB_BYTES
;
890 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
892 memset(sb
, 0, sizeof(*sb
));
894 sb
->md_magic
= MD_SB_MAGIC
;
895 sb
->major_version
= mddev
->major_version
;
896 sb
->patch_version
= mddev
->patch_version
;
897 sb
->gvalid_words
= 0; /* ignored */
898 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
899 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
900 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
901 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
903 sb
->ctime
= mddev
->ctime
;
904 sb
->level
= mddev
->level
;
905 sb
->size
= mddev
->size
;
906 sb
->raid_disks
= mddev
->raid_disks
;
907 sb
->md_minor
= mddev
->md_minor
;
908 sb
->not_persistent
= 0;
909 sb
->utime
= mddev
->utime
;
911 sb
->events_hi
= (mddev
->events
>>32);
912 sb
->events_lo
= (u32
)mddev
->events
;
914 if (mddev
->reshape_position
== MaxSector
)
915 sb
->minor_version
= 90;
917 sb
->minor_version
= 91;
918 sb
->reshape_position
= mddev
->reshape_position
;
919 sb
->new_level
= mddev
->new_level
;
920 sb
->delta_disks
= mddev
->delta_disks
;
921 sb
->new_layout
= mddev
->new_layout
;
922 sb
->new_chunk
= mddev
->new_chunk
;
924 mddev
->minor_version
= sb
->minor_version
;
927 sb
->recovery_cp
= mddev
->recovery_cp
;
928 sb
->cp_events_hi
= (mddev
->events
>>32);
929 sb
->cp_events_lo
= (u32
)mddev
->events
;
930 if (mddev
->recovery_cp
== MaxSector
)
931 sb
->state
= (1<< MD_SB_CLEAN
);
935 sb
->layout
= mddev
->layout
;
936 sb
->chunk_size
= mddev
->chunk_size
;
938 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
939 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
941 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
942 rdev_for_each(rdev2
, tmp
, mddev
) {
945 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
946 && !test_bit(Faulty
, &rdev2
->flags
))
947 desc_nr
= rdev2
->raid_disk
;
949 desc_nr
= next_spare
++;
950 rdev2
->desc_nr
= desc_nr
;
951 d
= &sb
->disks
[rdev2
->desc_nr
];
953 d
->number
= rdev2
->desc_nr
;
954 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
955 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
956 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
957 && !test_bit(Faulty
, &rdev2
->flags
))
958 d
->raid_disk
= rdev2
->raid_disk
;
960 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
961 if (test_bit(Faulty
, &rdev2
->flags
))
962 d
->state
= (1<<MD_DISK_FAULTY
);
963 else if (test_bit(In_sync
, &rdev2
->flags
)) {
964 d
->state
= (1<<MD_DISK_ACTIVE
);
965 d
->state
|= (1<<MD_DISK_SYNC
);
973 if (test_bit(WriteMostly
, &rdev2
->flags
))
974 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
976 /* now set the "removed" and "faulty" bits on any missing devices */
977 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
978 mdp_disk_t
*d
= &sb
->disks
[i
];
979 if (d
->state
== 0 && d
->number
== 0) {
982 d
->state
= (1<<MD_DISK_REMOVED
);
983 d
->state
|= (1<<MD_DISK_FAULTY
);
987 sb
->nr_disks
= nr_disks
;
988 sb
->active_disks
= active
;
989 sb
->working_disks
= working
;
990 sb
->failed_disks
= failed
;
991 sb
->spare_disks
= spare
;
993 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
994 sb
->sb_csum
= calc_sb_csum(sb
);
998 * rdev_size_change for 0.90.0
1000 static unsigned long long
1001 super_90_rdev_size_change(mdk_rdev_t
*rdev
, unsigned long long size
)
1003 if (size
&& size
< rdev
->mddev
->size
)
1004 return 0; /* component must fit device */
1005 size
*= 2; /* convert to sectors */
1006 if (rdev
->mddev
->bitmap_offset
)
1007 return 0; /* can't move bitmap */
1008 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1009 if (!size
|| size
> rdev
->sb_start
)
1010 size
= rdev
->sb_start
;
1011 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1013 md_super_wait(rdev
->mddev
);
1014 return size
/2; /* kB for sysfs */
1019 * version 1 superblock
1022 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1026 unsigned long long newcsum
;
1027 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1028 __le32
*isuper
= (__le32
*)sb
;
1031 disk_csum
= sb
->sb_csum
;
1034 for (i
=0; size
>=4; size
-= 4 )
1035 newcsum
+= le32_to_cpu(*isuper
++);
1038 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1040 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1041 sb
->sb_csum
= disk_csum
;
1042 return cpu_to_le32(csum
);
1045 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1047 struct mdp_superblock_1
*sb
;
1050 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1054 * Calculate the position of the superblock in 512byte sectors.
1055 * It is always aligned to a 4K boundary and
1056 * depeding on minor_version, it can be:
1057 * 0: At least 8K, but less than 12K, from end of device
1058 * 1: At start of device
1059 * 2: 4K from start of device.
1061 switch(minor_version
) {
1063 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1065 sb_start
&= ~(sector_t
)(4*2-1);
1076 rdev
->sb_start
= sb_start
;
1078 /* superblock is rarely larger than 1K, but it can be larger,
1079 * and it is safe to read 4k, so we do that
1081 ret
= read_disk_sb(rdev
, 4096);
1082 if (ret
) return ret
;
1085 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1087 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1088 sb
->major_version
!= cpu_to_le32(1) ||
1089 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1090 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1091 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1094 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1095 printk("md: invalid superblock checksum on %s\n",
1096 bdevname(rdev
->bdev
,b
));
1099 if (le64_to_cpu(sb
->data_size
) < 10) {
1100 printk("md: data_size too small on %s\n",
1101 bdevname(rdev
->bdev
,b
));
1104 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1105 if (sb
->level
!= cpu_to_le32(1) &&
1106 sb
->level
!= cpu_to_le32(4) &&
1107 sb
->level
!= cpu_to_le32(5) &&
1108 sb
->level
!= cpu_to_le32(6) &&
1109 sb
->level
!= cpu_to_le32(10)) {
1111 "md: bitmaps not supported for this level.\n");
1116 rdev
->preferred_minor
= 0xffff;
1117 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1118 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1120 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1121 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1122 if (rdev
->sb_size
& bmask
)
1123 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1126 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1129 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1132 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1138 struct mdp_superblock_1
*refsb
=
1139 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1141 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1142 sb
->level
!= refsb
->level
||
1143 sb
->layout
!= refsb
->layout
||
1144 sb
->chunksize
!= refsb
->chunksize
) {
1145 printk(KERN_WARNING
"md: %s has strangely different"
1146 " superblock to %s\n",
1147 bdevname(rdev
->bdev
,b
),
1148 bdevname(refdev
->bdev
,b2
));
1151 ev1
= le64_to_cpu(sb
->events
);
1152 ev2
= le64_to_cpu(refsb
->events
);
1160 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1162 rdev
->size
= rdev
->sb_start
/ 2;
1163 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1165 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1166 if (le32_to_cpu(sb
->chunksize
))
1167 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1169 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1174 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1176 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1177 __u64 ev1
= le64_to_cpu(sb
->events
);
1179 rdev
->raid_disk
= -1;
1180 clear_bit(Faulty
, &rdev
->flags
);
1181 clear_bit(In_sync
, &rdev
->flags
);
1182 clear_bit(WriteMostly
, &rdev
->flags
);
1183 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1185 if (mddev
->raid_disks
== 0) {
1186 mddev
->major_version
= 1;
1187 mddev
->patch_version
= 0;
1188 mddev
->external
= 0;
1189 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1190 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1191 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1192 mddev
->level
= le32_to_cpu(sb
->level
);
1193 mddev
->clevel
[0] = 0;
1194 mddev
->layout
= le32_to_cpu(sb
->layout
);
1195 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1196 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1197 mddev
->events
= ev1
;
1198 mddev
->bitmap_offset
= 0;
1199 mddev
->default_bitmap_offset
= 1024 >> 9;
1201 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1202 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1204 mddev
->max_disks
= (4096-256)/2;
1206 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1207 mddev
->bitmap_file
== NULL
)
1208 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1210 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1211 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1212 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1213 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1214 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1215 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1217 mddev
->reshape_position
= MaxSector
;
1218 mddev
->delta_disks
= 0;
1219 mddev
->new_level
= mddev
->level
;
1220 mddev
->new_layout
= mddev
->layout
;
1221 mddev
->new_chunk
= mddev
->chunk_size
;
1224 } else if (mddev
->pers
== NULL
) {
1225 /* Insist of good event counter while assembling */
1227 if (ev1
< mddev
->events
)
1229 } else if (mddev
->bitmap
) {
1230 /* If adding to array with a bitmap, then we can accept an
1231 * older device, but not too old.
1233 if (ev1
< mddev
->bitmap
->events_cleared
)
1236 if (ev1
< mddev
->events
)
1237 /* just a hot-add of a new device, leave raid_disk at -1 */
1240 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1242 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1244 case 0xffff: /* spare */
1246 case 0xfffe: /* faulty */
1247 set_bit(Faulty
, &rdev
->flags
);
1250 if ((le32_to_cpu(sb
->feature_map
) &
1251 MD_FEATURE_RECOVERY_OFFSET
))
1252 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1254 set_bit(In_sync
, &rdev
->flags
);
1255 rdev
->raid_disk
= role
;
1258 if (sb
->devflags
& WriteMostly1
)
1259 set_bit(WriteMostly
, &rdev
->flags
);
1260 } else /* MULTIPATH are always insync */
1261 set_bit(In_sync
, &rdev
->flags
);
1266 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1268 struct mdp_superblock_1
*sb
;
1269 struct list_head
*tmp
;
1272 /* make rdev->sb match mddev and rdev data. */
1274 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1276 sb
->feature_map
= 0;
1278 sb
->recovery_offset
= cpu_to_le64(0);
1279 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1280 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1281 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1283 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1284 sb
->events
= cpu_to_le64(mddev
->events
);
1286 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1288 sb
->resync_offset
= cpu_to_le64(0);
1290 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1292 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1293 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1295 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1296 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1297 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1300 if (rdev
->raid_disk
>= 0 &&
1301 !test_bit(In_sync
, &rdev
->flags
) &&
1302 rdev
->recovery_offset
> 0) {
1303 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1304 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1307 if (mddev
->reshape_position
!= MaxSector
) {
1308 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1309 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1310 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1311 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1312 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1313 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1317 rdev_for_each(rdev2
, tmp
, mddev
)
1318 if (rdev2
->desc_nr
+1 > max_dev
)
1319 max_dev
= rdev2
->desc_nr
+1;
1321 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1322 sb
->max_dev
= cpu_to_le32(max_dev
);
1323 for (i
=0; i
<max_dev
;i
++)
1324 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1326 rdev_for_each(rdev2
, tmp
, mddev
) {
1328 if (test_bit(Faulty
, &rdev2
->flags
))
1329 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1330 else if (test_bit(In_sync
, &rdev2
->flags
))
1331 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1332 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1333 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1335 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1338 sb
->sb_csum
= calc_sb_1_csum(sb
);
1341 static unsigned long long
1342 super_1_rdev_size_change(mdk_rdev_t
*rdev
, unsigned long long size
)
1344 struct mdp_superblock_1
*sb
;
1345 unsigned long long max_size
;
1346 if (size
&& size
< rdev
->mddev
->size
)
1347 return 0; /* component must fit device */
1348 size
*= 2; /* convert to sectors */
1349 if (rdev
->sb_start
< rdev
->data_offset
) {
1350 /* minor versions 1 and 2; superblock before data */
1351 max_size
= (rdev
->bdev
->bd_inode
->i_size
>> 9);
1352 max_size
-= rdev
->data_offset
;
1353 if (!size
|| size
> max_size
)
1355 } else if (rdev
->mddev
->bitmap_offset
) {
1356 /* minor version 0 with bitmap we can't move */
1359 /* minor version 0; superblock after data */
1361 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1362 sb_start
&= ~(sector_t
)(4*2 - 1);
1363 max_size
= rdev
->size
*2 + sb_start
- rdev
->sb_start
;
1364 if (!size
|| size
> max_size
)
1366 rdev
->sb_start
= sb_start
;
1368 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1369 sb
->data_size
= cpu_to_le64(size
);
1370 sb
->super_offset
= rdev
->sb_start
;
1371 sb
->sb_csum
= calc_sb_1_csum(sb
);
1372 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1374 md_super_wait(rdev
->mddev
);
1375 return size
/2; /* kB for sysfs */
1378 static struct super_type super_types
[] = {
1381 .owner
= THIS_MODULE
,
1382 .load_super
= super_90_load
,
1383 .validate_super
= super_90_validate
,
1384 .sync_super
= super_90_sync
,
1385 .rdev_size_change
= super_90_rdev_size_change
,
1389 .owner
= THIS_MODULE
,
1390 .load_super
= super_1_load
,
1391 .validate_super
= super_1_validate
,
1392 .sync_super
= super_1_sync
,
1393 .rdev_size_change
= super_1_rdev_size_change
,
1397 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1399 struct list_head
*tmp
, *tmp2
;
1400 mdk_rdev_t
*rdev
, *rdev2
;
1402 rdev_for_each(rdev
, tmp
, mddev1
)
1403 rdev_for_each(rdev2
, tmp2
, mddev2
)
1404 if (rdev
->bdev
->bd_contains
==
1405 rdev2
->bdev
->bd_contains
)
1411 static LIST_HEAD(pending_raid_disks
);
1413 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1415 char b
[BDEVNAME_SIZE
];
1425 /* prevent duplicates */
1426 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1429 /* make sure rdev->size exceeds mddev->size */
1430 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1432 /* Cannot change size, so fail
1433 * If mddev->level <= 0, then we don't care
1434 * about aligning sizes (e.g. linear)
1436 if (mddev
->level
> 0)
1439 mddev
->size
= rdev
->size
;
1442 /* Verify rdev->desc_nr is unique.
1443 * If it is -1, assign a free number, else
1444 * check number is not in use
1446 if (rdev
->desc_nr
< 0) {
1448 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1449 while (find_rdev_nr(mddev
, choice
))
1451 rdev
->desc_nr
= choice
;
1453 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1456 bdevname(rdev
->bdev
,b
);
1457 while ( (s
=strchr(b
, '/')) != NULL
)
1460 rdev
->mddev
= mddev
;
1461 printk(KERN_INFO
"md: bind<%s>\n", b
);
1463 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1466 if (rdev
->bdev
->bd_part
)
1467 ko
= &rdev
->bdev
->bd_part
->dev
.kobj
;
1469 ko
= &rdev
->bdev
->bd_disk
->dev
.kobj
;
1470 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1471 kobject_del(&rdev
->kobj
);
1474 list_add(&rdev
->same_set
, &mddev
->disks
);
1475 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1479 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1484 static void md_delayed_delete(struct work_struct
*ws
)
1486 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1487 kobject_del(&rdev
->kobj
);
1488 kobject_put(&rdev
->kobj
);
1491 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1493 char b
[BDEVNAME_SIZE
];
1498 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1499 list_del_init(&rdev
->same_set
);
1500 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1502 sysfs_remove_link(&rdev
->kobj
, "block");
1504 /* We need to delay this, otherwise we can deadlock when
1505 * writing to 'remove' to "dev/state"
1507 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1508 kobject_get(&rdev
->kobj
);
1509 schedule_work(&rdev
->del_work
);
1513 * prevent the device from being mounted, repartitioned or
1514 * otherwise reused by a RAID array (or any other kernel
1515 * subsystem), by bd_claiming the device.
1517 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1520 struct block_device
*bdev
;
1521 char b
[BDEVNAME_SIZE
];
1523 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1525 printk(KERN_ERR
"md: could not open %s.\n",
1526 __bdevname(dev
, b
));
1527 return PTR_ERR(bdev
);
1529 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1531 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1537 set_bit(AllReserved
, &rdev
->flags
);
1542 static void unlock_rdev(mdk_rdev_t
*rdev
)
1544 struct block_device
*bdev
= rdev
->bdev
;
1552 void md_autodetect_dev(dev_t dev
);
1554 static void export_rdev(mdk_rdev_t
* rdev
)
1556 char b
[BDEVNAME_SIZE
];
1557 printk(KERN_INFO
"md: export_rdev(%s)\n",
1558 bdevname(rdev
->bdev
,b
));
1562 list_del_init(&rdev
->same_set
);
1564 if (test_bit(AutoDetected
, &rdev
->flags
))
1565 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1568 kobject_put(&rdev
->kobj
);
1571 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1573 unbind_rdev_from_array(rdev
);
1577 static void export_array(mddev_t
*mddev
)
1579 struct list_head
*tmp
;
1582 rdev_for_each(rdev
, tmp
, mddev
) {
1587 kick_rdev_from_array(rdev
);
1589 if (!list_empty(&mddev
->disks
))
1591 mddev
->raid_disks
= 0;
1592 mddev
->major_version
= 0;
1595 static void print_desc(mdp_disk_t
*desc
)
1597 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1598 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1601 static void print_sb(mdp_super_t
*sb
)
1606 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1607 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1608 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1610 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1611 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1612 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1613 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1614 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1615 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1616 sb
->failed_disks
, sb
->spare_disks
,
1617 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1620 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1623 desc
= sb
->disks
+ i
;
1624 if (desc
->number
|| desc
->major
|| desc
->minor
||
1625 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1626 printk(" D %2d: ", i
);
1630 printk(KERN_INFO
"md: THIS: ");
1631 print_desc(&sb
->this_disk
);
1635 static void print_rdev(mdk_rdev_t
*rdev
)
1637 char b
[BDEVNAME_SIZE
];
1638 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1639 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1640 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1642 if (rdev
->sb_loaded
) {
1643 printk(KERN_INFO
"md: rdev superblock:\n");
1644 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1646 printk(KERN_INFO
"md: no rdev superblock!\n");
1649 static void md_print_devices(void)
1651 struct list_head
*tmp
, *tmp2
;
1654 char b
[BDEVNAME_SIZE
];
1657 printk("md: **********************************\n");
1658 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1659 printk("md: **********************************\n");
1660 for_each_mddev(mddev
, tmp
) {
1663 bitmap_print_sb(mddev
->bitmap
);
1665 printk("%s: ", mdname(mddev
));
1666 rdev_for_each(rdev
, tmp2
, mddev
)
1667 printk("<%s>", bdevname(rdev
->bdev
,b
));
1670 rdev_for_each(rdev
, tmp2
, mddev
)
1673 printk("md: **********************************\n");
1678 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1680 /* Update each superblock (in-memory image), but
1681 * if we are allowed to, skip spares which already
1682 * have the right event counter, or have one earlier
1683 * (which would mean they aren't being marked as dirty
1684 * with the rest of the array)
1687 struct list_head
*tmp
;
1689 rdev_for_each(rdev
, tmp
, mddev
) {
1690 if (rdev
->sb_events
== mddev
->events
||
1692 rdev
->raid_disk
< 0 &&
1693 (rdev
->sb_events
&1)==0 &&
1694 rdev
->sb_events
+1 == mddev
->events
)) {
1695 /* Don't update this superblock */
1696 rdev
->sb_loaded
= 2;
1698 super_types
[mddev
->major_version
].
1699 sync_super(mddev
, rdev
);
1700 rdev
->sb_loaded
= 1;
1705 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1707 struct list_head
*tmp
;
1712 if (mddev
->external
)
1715 spin_lock_irq(&mddev
->write_lock
);
1717 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1718 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1720 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1721 /* just a clean<-> dirty transition, possibly leave spares alone,
1722 * though if events isn't the right even/odd, we will have to do
1728 if (mddev
->degraded
)
1729 /* If the array is degraded, then skipping spares is both
1730 * dangerous and fairly pointless.
1731 * Dangerous because a device that was removed from the array
1732 * might have a event_count that still looks up-to-date,
1733 * so it can be re-added without a resync.
1734 * Pointless because if there are any spares to skip,
1735 * then a recovery will happen and soon that array won't
1736 * be degraded any more and the spare can go back to sleep then.
1740 sync_req
= mddev
->in_sync
;
1741 mddev
->utime
= get_seconds();
1743 /* If this is just a dirty<->clean transition, and the array is clean
1744 * and 'events' is odd, we can roll back to the previous clean state */
1746 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1747 && (mddev
->events
& 1)
1748 && mddev
->events
!= 1)
1751 /* otherwise we have to go forward and ... */
1753 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1754 /* .. if the array isn't clean, insist on an odd 'events' */
1755 if ((mddev
->events
&1)==0) {
1760 /* otherwise insist on an even 'events' (for clean states) */
1761 if ((mddev
->events
&1)) {
1768 if (!mddev
->events
) {
1770 * oops, this 64-bit counter should never wrap.
1771 * Either we are in around ~1 trillion A.C., assuming
1772 * 1 reboot per second, or we have a bug:
1779 * do not write anything to disk if using
1780 * nonpersistent superblocks
1782 if (!mddev
->persistent
) {
1783 if (!mddev
->external
)
1784 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1786 spin_unlock_irq(&mddev
->write_lock
);
1787 wake_up(&mddev
->sb_wait
);
1790 sync_sbs(mddev
, nospares
);
1791 spin_unlock_irq(&mddev
->write_lock
);
1794 "md: updating %s RAID superblock on device (in sync %d)\n",
1795 mdname(mddev
),mddev
->in_sync
);
1797 bitmap_update_sb(mddev
->bitmap
);
1798 rdev_for_each(rdev
, tmp
, mddev
) {
1799 char b
[BDEVNAME_SIZE
];
1800 dprintk(KERN_INFO
"md: ");
1801 if (rdev
->sb_loaded
!= 1)
1802 continue; /* no noise on spare devices */
1803 if (test_bit(Faulty
, &rdev
->flags
))
1804 dprintk("(skipping faulty ");
1806 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1807 if (!test_bit(Faulty
, &rdev
->flags
)) {
1808 md_super_write(mddev
,rdev
,
1809 rdev
->sb_start
, rdev
->sb_size
,
1811 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1812 bdevname(rdev
->bdev
,b
),
1813 (unsigned long long)rdev
->sb_start
);
1814 rdev
->sb_events
= mddev
->events
;
1818 if (mddev
->level
== LEVEL_MULTIPATH
)
1819 /* only need to write one superblock... */
1822 md_super_wait(mddev
);
1823 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1825 spin_lock_irq(&mddev
->write_lock
);
1826 if (mddev
->in_sync
!= sync_req
||
1827 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1828 /* have to write it out again */
1829 spin_unlock_irq(&mddev
->write_lock
);
1832 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1833 spin_unlock_irq(&mddev
->write_lock
);
1834 wake_up(&mddev
->sb_wait
);
1838 /* words written to sysfs files may, or may not, be \n terminated.
1839 * We want to accept with case. For this we use cmd_match.
1841 static int cmd_match(const char *cmd
, const char *str
)
1843 /* See if cmd, written into a sysfs file, matches
1844 * str. They must either be the same, or cmd can
1845 * have a trailing newline
1847 while (*cmd
&& *str
&& *cmd
== *str
) {
1858 struct rdev_sysfs_entry
{
1859 struct attribute attr
;
1860 ssize_t (*show
)(mdk_rdev_t
*, char *);
1861 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1865 state_show(mdk_rdev_t
*rdev
, char *page
)
1870 if (test_bit(Faulty
, &rdev
->flags
)) {
1871 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1874 if (test_bit(In_sync
, &rdev
->flags
)) {
1875 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1878 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1879 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1882 if (test_bit(Blocked
, &rdev
->flags
)) {
1883 len
+= sprintf(page
+len
, "%sblocked", sep
);
1886 if (!test_bit(Faulty
, &rdev
->flags
) &&
1887 !test_bit(In_sync
, &rdev
->flags
)) {
1888 len
+= sprintf(page
+len
, "%sspare", sep
);
1891 return len
+sprintf(page
+len
, "\n");
1895 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1898 * faulty - simulates and error
1899 * remove - disconnects the device
1900 * writemostly - sets write_mostly
1901 * -writemostly - clears write_mostly
1902 * blocked - sets the Blocked flag
1903 * -blocked - clears the Blocked flag
1906 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1907 md_error(rdev
->mddev
, rdev
);
1909 } else if (cmd_match(buf
, "remove")) {
1910 if (rdev
->raid_disk
>= 0)
1913 mddev_t
*mddev
= rdev
->mddev
;
1914 kick_rdev_from_array(rdev
);
1916 md_update_sb(mddev
, 1);
1917 md_new_event(mddev
);
1920 } else if (cmd_match(buf
, "writemostly")) {
1921 set_bit(WriteMostly
, &rdev
->flags
);
1923 } else if (cmd_match(buf
, "-writemostly")) {
1924 clear_bit(WriteMostly
, &rdev
->flags
);
1926 } else if (cmd_match(buf
, "blocked")) {
1927 set_bit(Blocked
, &rdev
->flags
);
1929 } else if (cmd_match(buf
, "-blocked")) {
1930 clear_bit(Blocked
, &rdev
->flags
);
1931 wake_up(&rdev
->blocked_wait
);
1932 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1933 md_wakeup_thread(rdev
->mddev
->thread
);
1938 sysfs_notify(&rdev
->kobj
, NULL
, "state");
1939 return err
? err
: len
;
1941 static struct rdev_sysfs_entry rdev_state
=
1942 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1945 errors_show(mdk_rdev_t
*rdev
, char *page
)
1947 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1951 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1954 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1955 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1956 atomic_set(&rdev
->corrected_errors
, n
);
1961 static struct rdev_sysfs_entry rdev_errors
=
1962 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1965 slot_show(mdk_rdev_t
*rdev
, char *page
)
1967 if (rdev
->raid_disk
< 0)
1968 return sprintf(page
, "none\n");
1970 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1974 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1979 int slot
= simple_strtoul(buf
, &e
, 10);
1980 if (strncmp(buf
, "none", 4)==0)
1982 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1984 if (rdev
->mddev
->pers
&& slot
== -1) {
1985 /* Setting 'slot' on an active array requires also
1986 * updating the 'rd%d' link, and communicating
1987 * with the personality with ->hot_*_disk.
1988 * For now we only support removing
1989 * failed/spare devices. This normally happens automatically,
1990 * but not when the metadata is externally managed.
1992 if (rdev
->raid_disk
== -1)
1994 /* personality does all needed checks */
1995 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
1997 err
= rdev
->mddev
->pers
->
1998 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2001 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2002 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2003 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2004 md_wakeup_thread(rdev
->mddev
->thread
);
2005 } else if (rdev
->mddev
->pers
) {
2007 struct list_head
*tmp
;
2008 /* Activating a spare .. or possibly reactivating
2009 * if we every get bitmaps working here.
2012 if (rdev
->raid_disk
!= -1)
2015 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2018 rdev_for_each(rdev2
, tmp
, rdev
->mddev
)
2019 if (rdev2
->raid_disk
== slot
)
2022 rdev
->raid_disk
= slot
;
2023 if (test_bit(In_sync
, &rdev
->flags
))
2024 rdev
->saved_raid_disk
= slot
;
2026 rdev
->saved_raid_disk
= -1;
2027 err
= rdev
->mddev
->pers
->
2028 hot_add_disk(rdev
->mddev
, rdev
);
2030 rdev
->raid_disk
= -1;
2033 sysfs_notify(&rdev
->kobj
, NULL
, "state");
2034 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2035 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2037 "md: cannot register "
2039 nm
, mdname(rdev
->mddev
));
2041 /* don't wakeup anyone, leave that to userspace. */
2043 if (slot
>= rdev
->mddev
->raid_disks
)
2045 rdev
->raid_disk
= slot
;
2046 /* assume it is working */
2047 clear_bit(Faulty
, &rdev
->flags
);
2048 clear_bit(WriteMostly
, &rdev
->flags
);
2049 set_bit(In_sync
, &rdev
->flags
);
2050 sysfs_notify(&rdev
->kobj
, NULL
, "state");
2056 static struct rdev_sysfs_entry rdev_slot
=
2057 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2060 offset_show(mdk_rdev_t
*rdev
, char *page
)
2062 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2066 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2069 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2070 if (e
==buf
|| (*e
&& *e
!= '\n'))
2072 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2074 if (rdev
->size
&& rdev
->mddev
->external
)
2075 /* Must set offset before size, so overlap checks
2078 rdev
->data_offset
= offset
;
2082 static struct rdev_sysfs_entry rdev_offset
=
2083 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2086 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2088 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
2091 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2093 /* check if two start/length pairs overlap */
2102 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2104 unsigned long long size
;
2105 unsigned long long oldsize
= rdev
->size
;
2106 mddev_t
*my_mddev
= rdev
->mddev
;
2108 if (strict_strtoull(buf
, 10, &size
) < 0)
2110 if (size
< my_mddev
->size
)
2112 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2113 if (my_mddev
->persistent
) {
2114 size
= super_types
[my_mddev
->major_version
].
2115 rdev_size_change(rdev
, size
);
2119 size
= (rdev
->bdev
->bd_inode
->i_size
>> 10);
2120 size
-= rdev
->data_offset
/2;
2122 if (size
< my_mddev
->size
)
2123 return -EINVAL
; /* component must fit device */
2127 if (size
> oldsize
&& my_mddev
->external
) {
2128 /* need to check that all other rdevs with the same ->bdev
2129 * do not overlap. We need to unlock the mddev to avoid
2130 * a deadlock. We have already changed rdev->size, and if
2131 * we have to change it back, we will have the lock again.
2135 struct list_head
*tmp
, *tmp2
;
2137 mddev_unlock(my_mddev
);
2138 for_each_mddev(mddev
, tmp
) {
2142 rdev_for_each(rdev2
, tmp2
, mddev
)
2143 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2144 (rdev
->bdev
== rdev2
->bdev
&&
2146 overlaps(rdev
->data_offset
, rdev
->size
* 2,
2148 rdev2
->size
* 2))) {
2152 mddev_unlock(mddev
);
2158 mddev_lock(my_mddev
);
2160 /* Someone else could have slipped in a size
2161 * change here, but doing so is just silly.
2162 * We put oldsize back because we *know* it is
2163 * safe, and trust userspace not to race with
2166 rdev
->size
= oldsize
;
2173 static struct rdev_sysfs_entry rdev_size
=
2174 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2176 static struct attribute
*rdev_default_attrs
[] = {
2185 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2187 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2188 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2189 mddev_t
*mddev
= rdev
->mddev
;
2195 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2197 if (rdev
->mddev
== NULL
)
2200 rv
= entry
->show(rdev
, page
);
2201 mddev_unlock(mddev
);
2207 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2208 const char *page
, size_t length
)
2210 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2211 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2213 mddev_t
*mddev
= rdev
->mddev
;
2217 if (!capable(CAP_SYS_ADMIN
))
2219 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2221 if (rdev
->mddev
== NULL
)
2224 rv
= entry
->store(rdev
, page
, length
);
2225 mddev_unlock(mddev
);
2230 static void rdev_free(struct kobject
*ko
)
2232 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2235 static struct sysfs_ops rdev_sysfs_ops
= {
2236 .show
= rdev_attr_show
,
2237 .store
= rdev_attr_store
,
2239 static struct kobj_type rdev_ktype
= {
2240 .release
= rdev_free
,
2241 .sysfs_ops
= &rdev_sysfs_ops
,
2242 .default_attrs
= rdev_default_attrs
,
2246 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2248 * mark the device faulty if:
2250 * - the device is nonexistent (zero size)
2251 * - the device has no valid superblock
2253 * a faulty rdev _never_ has rdev->sb set.
2255 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2257 char b
[BDEVNAME_SIZE
];
2262 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2264 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2265 return ERR_PTR(-ENOMEM
);
2268 if ((err
= alloc_disk_sb(rdev
)))
2271 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2275 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2278 rdev
->saved_raid_disk
= -1;
2279 rdev
->raid_disk
= -1;
2281 rdev
->data_offset
= 0;
2282 rdev
->sb_events
= 0;
2283 atomic_set(&rdev
->nr_pending
, 0);
2284 atomic_set(&rdev
->read_errors
, 0);
2285 atomic_set(&rdev
->corrected_errors
, 0);
2287 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2290 "md: %s has zero or unknown size, marking faulty!\n",
2291 bdevname(rdev
->bdev
,b
));
2296 if (super_format
>= 0) {
2297 err
= super_types
[super_format
].
2298 load_super(rdev
, NULL
, super_minor
);
2299 if (err
== -EINVAL
) {
2301 "md: %s does not have a valid v%d.%d "
2302 "superblock, not importing!\n",
2303 bdevname(rdev
->bdev
,b
),
2304 super_format
, super_minor
);
2309 "md: could not read %s's sb, not importing!\n",
2310 bdevname(rdev
->bdev
,b
));
2315 INIT_LIST_HEAD(&rdev
->same_set
);
2316 init_waitqueue_head(&rdev
->blocked_wait
);
2321 if (rdev
->sb_page
) {
2327 return ERR_PTR(err
);
2331 * Check a full RAID array for plausibility
2335 static void analyze_sbs(mddev_t
* mddev
)
2338 struct list_head
*tmp
;
2339 mdk_rdev_t
*rdev
, *freshest
;
2340 char b
[BDEVNAME_SIZE
];
2343 rdev_for_each(rdev
, tmp
, mddev
)
2344 switch (super_types
[mddev
->major_version
].
2345 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2353 "md: fatal superblock inconsistency in %s"
2354 " -- removing from array\n",
2355 bdevname(rdev
->bdev
,b
));
2356 kick_rdev_from_array(rdev
);
2360 super_types
[mddev
->major_version
].
2361 validate_super(mddev
, freshest
);
2364 rdev_for_each(rdev
, tmp
, mddev
) {
2365 if (rdev
!= freshest
)
2366 if (super_types
[mddev
->major_version
].
2367 validate_super(mddev
, rdev
)) {
2368 printk(KERN_WARNING
"md: kicking non-fresh %s"
2370 bdevname(rdev
->bdev
,b
));
2371 kick_rdev_from_array(rdev
);
2374 if (mddev
->level
== LEVEL_MULTIPATH
) {
2375 rdev
->desc_nr
= i
++;
2376 rdev
->raid_disk
= rdev
->desc_nr
;
2377 set_bit(In_sync
, &rdev
->flags
);
2378 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2379 rdev
->raid_disk
= -1;
2380 clear_bit(In_sync
, &rdev
->flags
);
2386 if (mddev
->recovery_cp
!= MaxSector
&&
2388 printk(KERN_ERR
"md: %s: raid array is not clean"
2389 " -- starting background reconstruction\n",
2395 safe_delay_show(mddev_t
*mddev
, char *page
)
2397 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2398 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2401 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2409 /* remove a period, and count digits after it */
2410 if (len
>= sizeof(buf
))
2412 strlcpy(buf
, cbuf
, len
);
2414 for (i
=0; i
<len
; i
++) {
2416 if (isdigit(buf
[i
])) {
2421 } else if (buf
[i
] == '.') {
2426 msec
= simple_strtoul(buf
, &e
, 10);
2427 if (e
== buf
|| (*e
&& *e
!= '\n'))
2429 msec
= (msec
* 1000) / scale
;
2431 mddev
->safemode_delay
= 0;
2433 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2434 if (mddev
->safemode_delay
== 0)
2435 mddev
->safemode_delay
= 1;
2439 static struct md_sysfs_entry md_safe_delay
=
2440 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2443 level_show(mddev_t
*mddev
, char *page
)
2445 struct mdk_personality
*p
= mddev
->pers
;
2447 return sprintf(page
, "%s\n", p
->name
);
2448 else if (mddev
->clevel
[0])
2449 return sprintf(page
, "%s\n", mddev
->clevel
);
2450 else if (mddev
->level
!= LEVEL_NONE
)
2451 return sprintf(page
, "%d\n", mddev
->level
);
2457 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2464 if (len
>= sizeof(mddev
->clevel
))
2466 strncpy(mddev
->clevel
, buf
, len
);
2467 if (mddev
->clevel
[len
-1] == '\n')
2469 mddev
->clevel
[len
] = 0;
2470 mddev
->level
= LEVEL_NONE
;
2474 static struct md_sysfs_entry md_level
=
2475 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2479 layout_show(mddev_t
*mddev
, char *page
)
2481 /* just a number, not meaningful for all levels */
2482 if (mddev
->reshape_position
!= MaxSector
&&
2483 mddev
->layout
!= mddev
->new_layout
)
2484 return sprintf(page
, "%d (%d)\n",
2485 mddev
->new_layout
, mddev
->layout
);
2486 return sprintf(page
, "%d\n", mddev
->layout
);
2490 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2493 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2495 if (!*buf
|| (*e
&& *e
!= '\n'))
2500 if (mddev
->reshape_position
!= MaxSector
)
2501 mddev
->new_layout
= n
;
2506 static struct md_sysfs_entry md_layout
=
2507 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2511 raid_disks_show(mddev_t
*mddev
, char *page
)
2513 if (mddev
->raid_disks
== 0)
2515 if (mddev
->reshape_position
!= MaxSector
&&
2516 mddev
->delta_disks
!= 0)
2517 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2518 mddev
->raid_disks
- mddev
->delta_disks
);
2519 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2522 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2525 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2529 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2531 if (!*buf
|| (*e
&& *e
!= '\n'))
2535 rv
= update_raid_disks(mddev
, n
);
2536 else if (mddev
->reshape_position
!= MaxSector
) {
2537 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2538 mddev
->delta_disks
= n
- olddisks
;
2539 mddev
->raid_disks
= n
;
2541 mddev
->raid_disks
= n
;
2542 return rv
? rv
: len
;
2544 static struct md_sysfs_entry md_raid_disks
=
2545 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2548 chunk_size_show(mddev_t
*mddev
, char *page
)
2550 if (mddev
->reshape_position
!= MaxSector
&&
2551 mddev
->chunk_size
!= mddev
->new_chunk
)
2552 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2554 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2558 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2560 /* can only set chunk_size if array is not yet active */
2562 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2564 if (!*buf
|| (*e
&& *e
!= '\n'))
2569 else if (mddev
->reshape_position
!= MaxSector
)
2570 mddev
->new_chunk
= n
;
2572 mddev
->chunk_size
= n
;
2575 static struct md_sysfs_entry md_chunk_size
=
2576 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2579 resync_start_show(mddev_t
*mddev
, char *page
)
2581 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2585 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2588 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2592 if (!*buf
|| (*e
&& *e
!= '\n'))
2595 mddev
->recovery_cp
= n
;
2598 static struct md_sysfs_entry md_resync_start
=
2599 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2602 * The array state can be:
2605 * No devices, no size, no level
2606 * Equivalent to STOP_ARRAY ioctl
2608 * May have some settings, but array is not active
2609 * all IO results in error
2610 * When written, doesn't tear down array, but just stops it
2611 * suspended (not supported yet)
2612 * All IO requests will block. The array can be reconfigured.
2613 * Writing this, if accepted, will block until array is quiescent
2615 * no resync can happen. no superblocks get written.
2616 * write requests fail
2618 * like readonly, but behaves like 'clean' on a write request.
2620 * clean - no pending writes, but otherwise active.
2621 * When written to inactive array, starts without resync
2622 * If a write request arrives then
2623 * if metadata is known, mark 'dirty' and switch to 'active'.
2624 * if not known, block and switch to write-pending
2625 * If written to an active array that has pending writes, then fails.
2627 * fully active: IO and resync can be happening.
2628 * When written to inactive array, starts with resync
2631 * clean, but writes are blocked waiting for 'active' to be written.
2634 * like active, but no writes have been seen for a while (100msec).
2637 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2638 write_pending
, active_idle
, bad_word
};
2639 static char *array_states
[] = {
2640 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2641 "write-pending", "active-idle", NULL
};
2643 static int match_word(const char *word
, char **list
)
2646 for (n
=0; list
[n
]; n
++)
2647 if (cmd_match(word
, list
[n
]))
2653 array_state_show(mddev_t
*mddev
, char *page
)
2655 enum array_state st
= inactive
;
2668 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2670 else if (mddev
->safemode
)
2676 if (list_empty(&mddev
->disks
) &&
2677 mddev
->raid_disks
== 0 &&
2683 return sprintf(page
, "%s\n", array_states
[st
]);
2686 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2687 static int do_md_run(mddev_t
* mddev
);
2688 static int restart_array(mddev_t
*mddev
);
2691 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2694 enum array_state st
= match_word(buf
, array_states
);
2699 /* stopping an active array */
2700 if (atomic_read(&mddev
->active
) > 1)
2702 err
= do_md_stop(mddev
, 0, 0);
2705 /* stopping an active array */
2707 if (atomic_read(&mddev
->active
) > 1)
2709 err
= do_md_stop(mddev
, 2, 0);
2711 err
= 0; /* already inactive */
2714 break; /* not supported yet */
2717 err
= do_md_stop(mddev
, 1, 0);
2720 set_disk_ro(mddev
->gendisk
, 1);
2721 err
= do_md_run(mddev
);
2727 err
= do_md_stop(mddev
, 1, 0);
2729 err
= restart_array(mddev
);
2732 set_disk_ro(mddev
->gendisk
, 0);
2736 err
= do_md_run(mddev
);
2741 restart_array(mddev
);
2742 spin_lock_irq(&mddev
->write_lock
);
2743 if (atomic_read(&mddev
->writes_pending
) == 0) {
2744 if (mddev
->in_sync
== 0) {
2746 if (mddev
->safemode
== 1)
2747 mddev
->safemode
= 0;
2748 if (mddev
->persistent
)
2749 set_bit(MD_CHANGE_CLEAN
,
2755 spin_unlock_irq(&mddev
->write_lock
);
2758 mddev
->recovery_cp
= MaxSector
;
2759 err
= do_md_run(mddev
);
2764 restart_array(mddev
);
2765 if (mddev
->external
)
2766 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2767 wake_up(&mddev
->sb_wait
);
2771 set_disk_ro(mddev
->gendisk
, 0);
2772 err
= do_md_run(mddev
);
2777 /* these cannot be set */
2783 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
2787 static struct md_sysfs_entry md_array_state
=
2788 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2791 null_show(mddev_t
*mddev
, char *page
)
2797 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2799 /* buf must be %d:%d\n? giving major and minor numbers */
2800 /* The new device is added to the array.
2801 * If the array has a persistent superblock, we read the
2802 * superblock to initialise info and check validity.
2803 * Otherwise, only checking done is that in bind_rdev_to_array,
2804 * which mainly checks size.
2807 int major
= simple_strtoul(buf
, &e
, 10);
2813 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2815 minor
= simple_strtoul(e
+1, &e
, 10);
2816 if (*e
&& *e
!= '\n')
2818 dev
= MKDEV(major
, minor
);
2819 if (major
!= MAJOR(dev
) ||
2820 minor
!= MINOR(dev
))
2824 if (mddev
->persistent
) {
2825 rdev
= md_import_device(dev
, mddev
->major_version
,
2826 mddev
->minor_version
);
2827 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2828 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2829 mdk_rdev_t
, same_set
);
2830 err
= super_types
[mddev
->major_version
]
2831 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2835 } else if (mddev
->external
)
2836 rdev
= md_import_device(dev
, -2, -1);
2838 rdev
= md_import_device(dev
, -1, -1);
2841 return PTR_ERR(rdev
);
2842 err
= bind_rdev_to_array(rdev
, mddev
);
2846 return err
? err
: len
;
2849 static struct md_sysfs_entry md_new_device
=
2850 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2853 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2856 unsigned long chunk
, end_chunk
;
2860 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2862 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2863 if (buf
== end
) break;
2864 if (*end
== '-') { /* range */
2866 end_chunk
= simple_strtoul(buf
, &end
, 0);
2867 if (buf
== end
) break;
2869 if (*end
&& !isspace(*end
)) break;
2870 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2872 while (isspace(*buf
)) buf
++;
2874 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2879 static struct md_sysfs_entry md_bitmap
=
2880 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2883 size_show(mddev_t
*mddev
, char *page
)
2885 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2888 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
2891 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2893 /* If array is inactive, we can reduce the component size, but
2894 * not increase it (except from 0).
2895 * If array is active, we can try an on-line resize
2899 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2900 if (!*buf
|| *buf
== '\n' ||
2905 err
= update_size(mddev
, size
* 2);
2906 md_update_sb(mddev
, 1);
2908 if (mddev
->size
== 0 ||
2914 return err
? err
: len
;
2917 static struct md_sysfs_entry md_size
=
2918 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2923 * 'none' for arrays with no metadata (good luck...)
2924 * 'external' for arrays with externally managed metadata,
2925 * or N.M for internally known formats
2928 metadata_show(mddev_t
*mddev
, char *page
)
2930 if (mddev
->persistent
)
2931 return sprintf(page
, "%d.%d\n",
2932 mddev
->major_version
, mddev
->minor_version
);
2933 else if (mddev
->external
)
2934 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
2936 return sprintf(page
, "none\n");
2940 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2944 if (!list_empty(&mddev
->disks
))
2947 if (cmd_match(buf
, "none")) {
2948 mddev
->persistent
= 0;
2949 mddev
->external
= 0;
2950 mddev
->major_version
= 0;
2951 mddev
->minor_version
= 90;
2954 if (strncmp(buf
, "external:", 9) == 0) {
2955 size_t namelen
= len
-9;
2956 if (namelen
>= sizeof(mddev
->metadata_type
))
2957 namelen
= sizeof(mddev
->metadata_type
)-1;
2958 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
2959 mddev
->metadata_type
[namelen
] = 0;
2960 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
2961 mddev
->metadata_type
[--namelen
] = 0;
2962 mddev
->persistent
= 0;
2963 mddev
->external
= 1;
2964 mddev
->major_version
= 0;
2965 mddev
->minor_version
= 90;
2968 major
= simple_strtoul(buf
, &e
, 10);
2969 if (e
==buf
|| *e
!= '.')
2972 minor
= simple_strtoul(buf
, &e
, 10);
2973 if (e
==buf
|| (*e
&& *e
!= '\n') )
2975 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2977 mddev
->major_version
= major
;
2978 mddev
->minor_version
= minor
;
2979 mddev
->persistent
= 1;
2980 mddev
->external
= 0;
2984 static struct md_sysfs_entry md_metadata
=
2985 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2988 action_show(mddev_t
*mddev
, char *page
)
2990 char *type
= "idle";
2991 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2992 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
2993 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2995 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2996 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2998 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3002 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3005 return sprintf(page
, "%s\n", type
);
3009 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3011 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3014 if (cmd_match(page
, "idle")) {
3015 if (mddev
->sync_thread
) {
3016 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3017 md_unregister_thread(mddev
->sync_thread
);
3018 mddev
->sync_thread
= NULL
;
3019 mddev
->recovery
= 0;
3021 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3022 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3024 else if (cmd_match(page
, "resync"))
3025 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3026 else if (cmd_match(page
, "recover")) {
3027 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3028 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3029 } else if (cmd_match(page
, "reshape")) {
3031 if (mddev
->pers
->start_reshape
== NULL
)
3033 err
= mddev
->pers
->start_reshape(mddev
);
3036 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3038 if (cmd_match(page
, "check"))
3039 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3040 else if (!cmd_match(page
, "repair"))
3042 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3043 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3045 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3046 md_wakeup_thread(mddev
->thread
);
3047 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
3052 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3054 return sprintf(page
, "%llu\n",
3055 (unsigned long long) mddev
->resync_mismatches
);
3058 static struct md_sysfs_entry md_scan_mode
=
3059 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3062 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3065 sync_min_show(mddev_t
*mddev
, char *page
)
3067 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3068 mddev
->sync_speed_min
? "local": "system");
3072 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3076 if (strncmp(buf
, "system", 6)==0) {
3077 mddev
->sync_speed_min
= 0;
3080 min
= simple_strtoul(buf
, &e
, 10);
3081 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3083 mddev
->sync_speed_min
= min
;
3087 static struct md_sysfs_entry md_sync_min
=
3088 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3091 sync_max_show(mddev_t
*mddev
, char *page
)
3093 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3094 mddev
->sync_speed_max
? "local": "system");
3098 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3102 if (strncmp(buf
, "system", 6)==0) {
3103 mddev
->sync_speed_max
= 0;
3106 max
= simple_strtoul(buf
, &e
, 10);
3107 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3109 mddev
->sync_speed_max
= max
;
3113 static struct md_sysfs_entry md_sync_max
=
3114 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3117 degraded_show(mddev_t
*mddev
, char *page
)
3119 return sprintf(page
, "%d\n", mddev
->degraded
);
3121 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3124 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3126 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3130 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3134 if (strict_strtol(buf
, 10, &n
))
3137 if (n
!= 0 && n
!= 1)
3140 mddev
->parallel_resync
= n
;
3142 if (mddev
->sync_thread
)
3143 wake_up(&resync_wait
);
3148 /* force parallel resync, even with shared block devices */
3149 static struct md_sysfs_entry md_sync_force_parallel
=
3150 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3151 sync_force_parallel_show
, sync_force_parallel_store
);
3154 sync_speed_show(mddev_t
*mddev
, char *page
)
3156 unsigned long resync
, dt
, db
;
3157 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3158 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3160 db
= resync
- mddev
->resync_mark_cnt
;
3161 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3164 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3167 sync_completed_show(mddev_t
*mddev
, char *page
)
3169 unsigned long max_blocks
, resync
;
3171 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3172 max_blocks
= mddev
->resync_max_sectors
;
3174 max_blocks
= mddev
->size
<< 1;
3176 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3177 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3180 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3183 min_sync_show(mddev_t
*mddev
, char *page
)
3185 return sprintf(page
, "%llu\n",
3186 (unsigned long long)mddev
->resync_min
);
3189 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3191 unsigned long long min
;
3192 if (strict_strtoull(buf
, 10, &min
))
3194 if (min
> mddev
->resync_max
)
3196 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3199 /* Must be a multiple of chunk_size */
3200 if (mddev
->chunk_size
) {
3201 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3204 mddev
->resync_min
= min
;
3209 static struct md_sysfs_entry md_min_sync
=
3210 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3213 max_sync_show(mddev_t
*mddev
, char *page
)
3215 if (mddev
->resync_max
== MaxSector
)
3216 return sprintf(page
, "max\n");
3218 return sprintf(page
, "%llu\n",
3219 (unsigned long long)mddev
->resync_max
);
3222 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3224 if (strncmp(buf
, "max", 3) == 0)
3225 mddev
->resync_max
= MaxSector
;
3227 unsigned long long max
;
3228 if (strict_strtoull(buf
, 10, &max
))
3230 if (max
< mddev
->resync_min
)
3232 if (max
< mddev
->resync_max
&&
3233 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3236 /* Must be a multiple of chunk_size */
3237 if (mddev
->chunk_size
) {
3238 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3241 mddev
->resync_max
= max
;
3243 wake_up(&mddev
->recovery_wait
);
3247 static struct md_sysfs_entry md_max_sync
=
3248 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3251 suspend_lo_show(mddev_t
*mddev
, char *page
)
3253 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3257 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3260 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3262 if (mddev
->pers
->quiesce
== NULL
)
3264 if (buf
== e
|| (*e
&& *e
!= '\n'))
3266 if (new >= mddev
->suspend_hi
||
3267 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3268 mddev
->suspend_lo
= new;
3269 mddev
->pers
->quiesce(mddev
, 2);
3274 static struct md_sysfs_entry md_suspend_lo
=
3275 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3279 suspend_hi_show(mddev_t
*mddev
, char *page
)
3281 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3285 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3288 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3290 if (mddev
->pers
->quiesce
== NULL
)
3292 if (buf
== e
|| (*e
&& *e
!= '\n'))
3294 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3295 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3296 mddev
->suspend_hi
= new;
3297 mddev
->pers
->quiesce(mddev
, 1);
3298 mddev
->pers
->quiesce(mddev
, 0);
3303 static struct md_sysfs_entry md_suspend_hi
=
3304 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3307 reshape_position_show(mddev_t
*mddev
, char *page
)
3309 if (mddev
->reshape_position
!= MaxSector
)
3310 return sprintf(page
, "%llu\n",
3311 (unsigned long long)mddev
->reshape_position
);
3312 strcpy(page
, "none\n");
3317 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3320 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3323 if (buf
== e
|| (*e
&& *e
!= '\n'))
3325 mddev
->reshape_position
= new;
3326 mddev
->delta_disks
= 0;
3327 mddev
->new_level
= mddev
->level
;
3328 mddev
->new_layout
= mddev
->layout
;
3329 mddev
->new_chunk
= mddev
->chunk_size
;
3333 static struct md_sysfs_entry md_reshape_position
=
3334 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3335 reshape_position_store
);
3338 static struct attribute
*md_default_attrs
[] = {
3341 &md_raid_disks
.attr
,
3342 &md_chunk_size
.attr
,
3344 &md_resync_start
.attr
,
3346 &md_new_device
.attr
,
3347 &md_safe_delay
.attr
,
3348 &md_array_state
.attr
,
3349 &md_reshape_position
.attr
,
3353 static struct attribute
*md_redundancy_attrs
[] = {
3355 &md_mismatches
.attr
,
3358 &md_sync_speed
.attr
,
3359 &md_sync_force_parallel
.attr
,
3360 &md_sync_completed
.attr
,
3363 &md_suspend_lo
.attr
,
3364 &md_suspend_hi
.attr
,
3369 static struct attribute_group md_redundancy_group
= {
3371 .attrs
= md_redundancy_attrs
,
3376 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3378 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3379 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3384 rv
= mddev_lock(mddev
);
3386 rv
= entry
->show(mddev
, page
);
3387 mddev_unlock(mddev
);
3393 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3394 const char *page
, size_t length
)
3396 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3397 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3402 if (!capable(CAP_SYS_ADMIN
))
3404 rv
= mddev_lock(mddev
);
3406 rv
= entry
->store(mddev
, page
, length
);
3407 mddev_unlock(mddev
);
3412 static void md_free(struct kobject
*ko
)
3414 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3418 static struct sysfs_ops md_sysfs_ops
= {
3419 .show
= md_attr_show
,
3420 .store
= md_attr_store
,
3422 static struct kobj_type md_ktype
= {
3424 .sysfs_ops
= &md_sysfs_ops
,
3425 .default_attrs
= md_default_attrs
,
3430 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3432 static DEFINE_MUTEX(disks_mutex
);
3433 mddev_t
*mddev
= mddev_find(dev
);
3434 struct gendisk
*disk
;
3435 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3436 int shift
= partitioned
? MdpMinorShift
: 0;
3437 int unit
= MINOR(dev
) >> shift
;
3443 mutex_lock(&disks_mutex
);
3444 if (mddev
->gendisk
) {
3445 mutex_unlock(&disks_mutex
);
3449 disk
= alloc_disk(1 << shift
);
3451 mutex_unlock(&disks_mutex
);
3455 disk
->major
= MAJOR(dev
);
3456 disk
->first_minor
= unit
<< shift
;
3458 sprintf(disk
->disk_name
, "md_d%d", unit
);
3460 sprintf(disk
->disk_name
, "md%d", unit
);
3461 disk
->fops
= &md_fops
;
3462 disk
->private_data
= mddev
;
3463 disk
->queue
= mddev
->queue
;
3465 mddev
->gendisk
= disk
;
3466 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
, &disk
->dev
.kobj
,
3468 mutex_unlock(&disks_mutex
);
3470 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3473 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3477 static void md_safemode_timeout(unsigned long data
)
3479 mddev_t
*mddev
= (mddev_t
*) data
;
3481 if (!atomic_read(&mddev
->writes_pending
)) {
3482 mddev
->safemode
= 1;
3483 if (mddev
->external
)
3484 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3486 md_wakeup_thread(mddev
->thread
);
3489 static int start_dirty_degraded
;
3491 static int do_md_run(mddev_t
* mddev
)
3495 struct list_head
*tmp
;
3497 struct gendisk
*disk
;
3498 struct mdk_personality
*pers
;
3499 char b
[BDEVNAME_SIZE
];
3501 if (list_empty(&mddev
->disks
))
3502 /* cannot run an array with no devices.. */
3509 * Analyze all RAID superblock(s)
3511 if (!mddev
->raid_disks
) {
3512 if (!mddev
->persistent
)
3517 chunk_size
= mddev
->chunk_size
;
3520 if (chunk_size
> MAX_CHUNK_SIZE
) {
3521 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3522 chunk_size
, MAX_CHUNK_SIZE
);
3526 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3528 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3529 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3532 if (chunk_size
< PAGE_SIZE
) {
3533 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3534 chunk_size
, PAGE_SIZE
);
3538 /* devices must have minimum size of one chunk */
3539 rdev_for_each(rdev
, tmp
, mddev
) {
3540 if (test_bit(Faulty
, &rdev
->flags
))
3542 if (rdev
->size
< chunk_size
/ 1024) {
3544 "md: Dev %s smaller than chunk_size:"
3546 bdevname(rdev
->bdev
,b
),
3547 (unsigned long long)rdev
->size
,
3555 if (mddev
->level
!= LEVEL_NONE
)
3556 request_module("md-level-%d", mddev
->level
);
3557 else if (mddev
->clevel
[0])
3558 request_module("md-%s", mddev
->clevel
);
3562 * Drop all container device buffers, from now on
3563 * the only valid external interface is through the md
3566 rdev_for_each(rdev
, tmp
, mddev
) {
3567 if (test_bit(Faulty
, &rdev
->flags
))
3569 sync_blockdev(rdev
->bdev
);
3570 invalidate_bdev(rdev
->bdev
);
3572 /* perform some consistency tests on the device.
3573 * We don't want the data to overlap the metadata,
3574 * Internal Bitmap issues has handled elsewhere.
3576 if (rdev
->data_offset
< rdev
->sb_start
) {
3578 rdev
->data_offset
+ mddev
->size
*2
3580 printk("md: %s: data overlaps metadata\n",
3585 if (rdev
->sb_start
+ rdev
->sb_size
/512
3586 > rdev
->data_offset
) {
3587 printk("md: %s: metadata overlaps data\n",
3592 sysfs_notify(&rdev
->kobj
, NULL
, "state");
3595 md_probe(mddev
->unit
, NULL
, NULL
);
3596 disk
= mddev
->gendisk
;
3600 spin_lock(&pers_lock
);
3601 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3602 if (!pers
|| !try_module_get(pers
->owner
)) {
3603 spin_unlock(&pers_lock
);
3604 if (mddev
->level
!= LEVEL_NONE
)
3605 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3608 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3613 spin_unlock(&pers_lock
);
3614 mddev
->level
= pers
->level
;
3615 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3617 if (mddev
->reshape_position
!= MaxSector
&&
3618 pers
->start_reshape
== NULL
) {
3619 /* This personality cannot handle reshaping... */
3621 module_put(pers
->owner
);
3625 if (pers
->sync_request
) {
3626 /* Warn if this is a potentially silly
3629 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3631 struct list_head
*tmp2
;
3633 rdev_for_each(rdev
, tmp
, mddev
) {
3634 rdev_for_each(rdev2
, tmp2
, mddev
) {
3636 rdev
->bdev
->bd_contains
==
3637 rdev2
->bdev
->bd_contains
) {
3639 "%s: WARNING: %s appears to be"
3640 " on the same physical disk as"
3643 bdevname(rdev
->bdev
,b
),
3644 bdevname(rdev2
->bdev
,b2
));
3651 "True protection against single-disk"
3652 " failure might be compromised.\n");
3655 mddev
->recovery
= 0;
3656 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3657 mddev
->barriers_work
= 1;
3658 mddev
->ok_start_degraded
= start_dirty_degraded
;
3661 mddev
->ro
= 2; /* read-only, but switch on first write */
3663 err
= mddev
->pers
->run(mddev
);
3665 printk(KERN_ERR
"md: pers->run() failed ...\n");
3666 else if (mddev
->pers
->sync_request
) {
3667 err
= bitmap_create(mddev
);
3669 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3670 mdname(mddev
), err
);
3671 mddev
->pers
->stop(mddev
);
3675 module_put(mddev
->pers
->owner
);
3677 bitmap_destroy(mddev
);
3680 if (mddev
->pers
->sync_request
) {
3681 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3683 "md: cannot register extra attributes for %s\n",
3685 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3688 atomic_set(&mddev
->writes_pending
,0);
3689 mddev
->safemode
= 0;
3690 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3691 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3692 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3695 rdev_for_each(rdev
, tmp
, mddev
)
3696 if (rdev
->raid_disk
>= 0) {
3698 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3699 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3700 printk("md: cannot register %s for %s\n",
3704 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3707 md_update_sb(mddev
, 0);
3709 set_capacity(disk
, mddev
->array_size
<<1);
3711 /* If we call blk_queue_make_request here, it will
3712 * re-initialise max_sectors etc which may have been
3713 * refined inside -> run. So just set the bits we need to set.
3714 * Most initialisation happended when we called
3715 * blk_queue_make_request(..., md_fail_request)
3718 mddev
->queue
->queuedata
= mddev
;
3719 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3721 /* If there is a partially-recovered drive we need to
3722 * start recovery here. If we leave it to md_check_recovery,
3723 * it will remove the drives and not do the right thing
3725 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3726 struct list_head
*rtmp
;
3728 rdev_for_each(rdev
, rtmp
, mddev
)
3729 if (rdev
->raid_disk
>= 0 &&
3730 !test_bit(In_sync
, &rdev
->flags
) &&
3731 !test_bit(Faulty
, &rdev
->flags
))
3732 /* complete an interrupted recovery */
3734 if (spares
&& mddev
->pers
->sync_request
) {
3735 mddev
->recovery
= 0;
3736 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3737 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3740 if (!mddev
->sync_thread
) {
3741 printk(KERN_ERR
"%s: could not start resync"
3744 /* leave the spares where they are, it shouldn't hurt */
3745 mddev
->recovery
= 0;
3749 md_wakeup_thread(mddev
->thread
);
3750 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3753 md_new_event(mddev
);
3754 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3755 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
3756 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3757 kobject_uevent(&mddev
->gendisk
->dev
.kobj
, KOBJ_CHANGE
);
3761 static int restart_array(mddev_t
*mddev
)
3763 struct gendisk
*disk
= mddev
->gendisk
;
3765 /* Complain if it has no devices */
3766 if (list_empty(&mddev
->disks
))
3772 mddev
->safemode
= 0;
3774 set_disk_ro(disk
, 0);
3775 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3777 /* Kick recovery or resync if necessary */
3778 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3779 md_wakeup_thread(mddev
->thread
);
3780 md_wakeup_thread(mddev
->sync_thread
);
3781 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3785 /* similar to deny_write_access, but accounts for our holding a reference
3786 * to the file ourselves */
3787 static int deny_bitmap_write_access(struct file
* file
)
3789 struct inode
*inode
= file
->f_mapping
->host
;
3791 spin_lock(&inode
->i_lock
);
3792 if (atomic_read(&inode
->i_writecount
) > 1) {
3793 spin_unlock(&inode
->i_lock
);
3796 atomic_set(&inode
->i_writecount
, -1);
3797 spin_unlock(&inode
->i_lock
);
3802 static void restore_bitmap_write_access(struct file
*file
)
3804 struct inode
*inode
= file
->f_mapping
->host
;
3806 spin_lock(&inode
->i_lock
);
3807 atomic_set(&inode
->i_writecount
, 1);
3808 spin_unlock(&inode
->i_lock
);
3812 * 0 - completely stop and dis-assemble array
3813 * 1 - switch to readonly
3814 * 2 - stop but do not disassemble array
3816 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
3819 struct gendisk
*disk
= mddev
->gendisk
;
3821 if (atomic_read(&mddev
->active
) > 1 + is_open
) {
3822 printk("md: %s still in use.\n",mdname(mddev
));
3828 if (mddev
->sync_thread
) {
3829 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3830 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3831 md_unregister_thread(mddev
->sync_thread
);
3832 mddev
->sync_thread
= NULL
;
3835 del_timer_sync(&mddev
->safemode_timer
);
3837 invalidate_partition(disk
, 0);
3840 case 1: /* readonly */
3846 case 0: /* disassemble */
3848 bitmap_flush(mddev
);
3849 md_super_wait(mddev
);
3851 set_disk_ro(disk
, 0);
3852 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3853 mddev
->pers
->stop(mddev
);
3854 mddev
->queue
->merge_bvec_fn
= NULL
;
3855 mddev
->queue
->unplug_fn
= NULL
;
3856 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3857 if (mddev
->pers
->sync_request
)
3858 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3860 module_put(mddev
->pers
->owner
);
3862 /* tell userspace to handle 'inactive' */
3863 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3865 set_capacity(disk
, 0);
3871 if (!mddev
->in_sync
|| mddev
->flags
) {
3872 /* mark array as shutdown cleanly */
3874 md_update_sb(mddev
, 1);
3877 set_disk_ro(disk
, 1);
3878 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3882 * Free resources if final stop
3886 struct list_head
*tmp
;
3888 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3890 bitmap_destroy(mddev
);
3891 if (mddev
->bitmap_file
) {
3892 restore_bitmap_write_access(mddev
->bitmap_file
);
3893 fput(mddev
->bitmap_file
);
3894 mddev
->bitmap_file
= NULL
;
3896 mddev
->bitmap_offset
= 0;
3898 rdev_for_each(rdev
, tmp
, mddev
)
3899 if (rdev
->raid_disk
>= 0) {
3901 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3902 sysfs_remove_link(&mddev
->kobj
, nm
);
3905 /* make sure all md_delayed_delete calls have finished */
3906 flush_scheduled_work();
3908 export_array(mddev
);
3910 mddev
->array_size
= 0;
3912 mddev
->raid_disks
= 0;
3913 mddev
->recovery_cp
= 0;
3914 mddev
->resync_min
= 0;
3915 mddev
->resync_max
= MaxSector
;
3916 mddev
->reshape_position
= MaxSector
;
3917 mddev
->external
= 0;
3918 mddev
->persistent
= 0;
3919 mddev
->level
= LEVEL_NONE
;
3920 mddev
->clevel
[0] = 0;
3923 mddev
->metadata_type
[0] = 0;
3924 mddev
->chunk_size
= 0;
3925 mddev
->ctime
= mddev
->utime
= 0;
3927 mddev
->max_disks
= 0;
3929 mddev
->delta_disks
= 0;
3930 mddev
->new_level
= LEVEL_NONE
;
3931 mddev
->new_layout
= 0;
3932 mddev
->new_chunk
= 0;
3933 mddev
->curr_resync
= 0;
3934 mddev
->resync_mismatches
= 0;
3935 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
3936 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
3937 mddev
->recovery
= 0;
3940 mddev
->degraded
= 0;
3941 mddev
->barriers_work
= 0;
3942 mddev
->safemode
= 0;
3944 } else if (mddev
->pers
)
3945 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3948 md_new_event(mddev
);
3949 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3955 static void autorun_array(mddev_t
*mddev
)
3958 struct list_head
*tmp
;
3961 if (list_empty(&mddev
->disks
))
3964 printk(KERN_INFO
"md: running: ");
3966 rdev_for_each(rdev
, tmp
, mddev
) {
3967 char b
[BDEVNAME_SIZE
];
3968 printk("<%s>", bdevname(rdev
->bdev
,b
));
3972 err
= do_md_run (mddev
);
3974 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3975 do_md_stop (mddev
, 0, 0);
3980 * lets try to run arrays based on all disks that have arrived
3981 * until now. (those are in pending_raid_disks)
3983 * the method: pick the first pending disk, collect all disks with
3984 * the same UUID, remove all from the pending list and put them into
3985 * the 'same_array' list. Then order this list based on superblock
3986 * update time (freshest comes first), kick out 'old' disks and
3987 * compare superblocks. If everything's fine then run it.
3989 * If "unit" is allocated, then bump its reference count
3991 static void autorun_devices(int part
)
3993 struct list_head
*tmp
;
3994 mdk_rdev_t
*rdev0
, *rdev
;
3996 char b
[BDEVNAME_SIZE
];
3998 printk(KERN_INFO
"md: autorun ...\n");
3999 while (!list_empty(&pending_raid_disks
)) {
4002 LIST_HEAD(candidates
);
4003 rdev0
= list_entry(pending_raid_disks
.next
,
4004 mdk_rdev_t
, same_set
);
4006 printk(KERN_INFO
"md: considering %s ...\n",
4007 bdevname(rdev0
->bdev
,b
));
4008 INIT_LIST_HEAD(&candidates
);
4009 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
)
4010 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4011 printk(KERN_INFO
"md: adding %s ...\n",
4012 bdevname(rdev
->bdev
,b
));
4013 list_move(&rdev
->same_set
, &candidates
);
4016 * now we have a set of devices, with all of them having
4017 * mostly sane superblocks. It's time to allocate the
4021 dev
= MKDEV(mdp_major
,
4022 rdev0
->preferred_minor
<< MdpMinorShift
);
4023 unit
= MINOR(dev
) >> MdpMinorShift
;
4025 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4028 if (rdev0
->preferred_minor
!= unit
) {
4029 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4030 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4034 md_probe(dev
, NULL
, NULL
);
4035 mddev
= mddev_find(dev
);
4036 if (!mddev
|| !mddev
->gendisk
) {
4040 "md: cannot allocate memory for md drive.\n");
4043 if (mddev_lock(mddev
))
4044 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4046 else if (mddev
->raid_disks
|| mddev
->major_version
4047 || !list_empty(&mddev
->disks
)) {
4049 "md: %s already running, cannot run %s\n",
4050 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4051 mddev_unlock(mddev
);
4053 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4054 mddev
->persistent
= 1;
4055 rdev_for_each_list(rdev
, tmp
, candidates
) {
4056 list_del_init(&rdev
->same_set
);
4057 if (bind_rdev_to_array(rdev
, mddev
))
4060 autorun_array(mddev
);
4061 mddev_unlock(mddev
);
4063 /* on success, candidates will be empty, on error
4066 rdev_for_each_list(rdev
, tmp
, candidates
)
4070 printk(KERN_INFO
"md: ... autorun DONE.\n");
4072 #endif /* !MODULE */
4074 static int get_version(void __user
* arg
)
4078 ver
.major
= MD_MAJOR_VERSION
;
4079 ver
.minor
= MD_MINOR_VERSION
;
4080 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4082 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4088 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4090 mdu_array_info_t info
;
4091 int nr
,working
,active
,failed
,spare
;
4093 struct list_head
*tmp
;
4095 nr
=working
=active
=failed
=spare
=0;
4096 rdev_for_each(rdev
, tmp
, mddev
) {
4098 if (test_bit(Faulty
, &rdev
->flags
))
4102 if (test_bit(In_sync
, &rdev
->flags
))
4109 info
.major_version
= mddev
->major_version
;
4110 info
.minor_version
= mddev
->minor_version
;
4111 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4112 info
.ctime
= mddev
->ctime
;
4113 info
.level
= mddev
->level
;
4114 info
.size
= mddev
->size
;
4115 if (info
.size
!= mddev
->size
) /* overflow */
4118 info
.raid_disks
= mddev
->raid_disks
;
4119 info
.md_minor
= mddev
->md_minor
;
4120 info
.not_persistent
= !mddev
->persistent
;
4122 info
.utime
= mddev
->utime
;
4125 info
.state
= (1<<MD_SB_CLEAN
);
4126 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4127 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4128 info
.active_disks
= active
;
4129 info
.working_disks
= working
;
4130 info
.failed_disks
= failed
;
4131 info
.spare_disks
= spare
;
4133 info
.layout
= mddev
->layout
;
4134 info
.chunk_size
= mddev
->chunk_size
;
4136 if (copy_to_user(arg
, &info
, sizeof(info
)))
4142 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4144 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4145 char *ptr
, *buf
= NULL
;
4148 if (md_allow_write(mddev
))
4149 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4151 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4156 /* bitmap disabled, zero the first byte and copy out */
4157 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4158 file
->pathname
[0] = '\0';
4162 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4166 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4170 strcpy(file
->pathname
, ptr
);
4174 if (copy_to_user(arg
, file
, sizeof(*file
)))
4182 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4184 mdu_disk_info_t info
;
4187 if (copy_from_user(&info
, arg
, sizeof(info
)))
4190 rdev
= find_rdev_nr(mddev
, info
.number
);
4192 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4193 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4194 info
.raid_disk
= rdev
->raid_disk
;
4196 if (test_bit(Faulty
, &rdev
->flags
))
4197 info
.state
|= (1<<MD_DISK_FAULTY
);
4198 else if (test_bit(In_sync
, &rdev
->flags
)) {
4199 info
.state
|= (1<<MD_DISK_ACTIVE
);
4200 info
.state
|= (1<<MD_DISK_SYNC
);
4202 if (test_bit(WriteMostly
, &rdev
->flags
))
4203 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4205 info
.major
= info
.minor
= 0;
4206 info
.raid_disk
= -1;
4207 info
.state
= (1<<MD_DISK_REMOVED
);
4210 if (copy_to_user(arg
, &info
, sizeof(info
)))
4216 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4218 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4220 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4222 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4225 if (!mddev
->raid_disks
) {
4227 /* expecting a device which has a superblock */
4228 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4231 "md: md_import_device returned %ld\n",
4233 return PTR_ERR(rdev
);
4235 if (!list_empty(&mddev
->disks
)) {
4236 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4237 mdk_rdev_t
, same_set
);
4238 int err
= super_types
[mddev
->major_version
]
4239 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4242 "md: %s has different UUID to %s\n",
4243 bdevname(rdev
->bdev
,b
),
4244 bdevname(rdev0
->bdev
,b2
));
4249 err
= bind_rdev_to_array(rdev
, mddev
);
4256 * add_new_disk can be used once the array is assembled
4257 * to add "hot spares". They must already have a superblock
4262 if (!mddev
->pers
->hot_add_disk
) {
4264 "%s: personality does not support diskops!\n",
4268 if (mddev
->persistent
)
4269 rdev
= md_import_device(dev
, mddev
->major_version
,
4270 mddev
->minor_version
);
4272 rdev
= md_import_device(dev
, -1, -1);
4275 "md: md_import_device returned %ld\n",
4277 return PTR_ERR(rdev
);
4279 /* set save_raid_disk if appropriate */
4280 if (!mddev
->persistent
) {
4281 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4282 info
->raid_disk
< mddev
->raid_disks
)
4283 rdev
->raid_disk
= info
->raid_disk
;
4285 rdev
->raid_disk
= -1;
4287 super_types
[mddev
->major_version
].
4288 validate_super(mddev
, rdev
);
4289 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4291 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4292 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4293 set_bit(WriteMostly
, &rdev
->flags
);
4295 rdev
->raid_disk
= -1;
4296 err
= bind_rdev_to_array(rdev
, mddev
);
4297 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4298 /* If there is hot_add_disk but no hot_remove_disk
4299 * then added disks for geometry changes,
4300 * and should be added immediately.
4302 super_types
[mddev
->major_version
].
4303 validate_super(mddev
, rdev
);
4304 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4306 unbind_rdev_from_array(rdev
);
4311 sysfs_notify(&rdev
->kobj
, NULL
, "state");
4313 md_update_sb(mddev
, 1);
4314 if (mddev
->degraded
)
4315 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4316 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4317 md_wakeup_thread(mddev
->thread
);
4321 /* otherwise, add_new_disk is only allowed
4322 * for major_version==0 superblocks
4324 if (mddev
->major_version
!= 0) {
4325 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4330 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4332 rdev
= md_import_device (dev
, -1, 0);
4335 "md: error, md_import_device() returned %ld\n",
4337 return PTR_ERR(rdev
);
4339 rdev
->desc_nr
= info
->number
;
4340 if (info
->raid_disk
< mddev
->raid_disks
)
4341 rdev
->raid_disk
= info
->raid_disk
;
4343 rdev
->raid_disk
= -1;
4345 if (rdev
->raid_disk
< mddev
->raid_disks
)
4346 if (info
->state
& (1<<MD_DISK_SYNC
))
4347 set_bit(In_sync
, &rdev
->flags
);
4349 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4350 set_bit(WriteMostly
, &rdev
->flags
);
4352 if (!mddev
->persistent
) {
4353 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4354 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4356 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4357 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4359 err
= bind_rdev_to_array(rdev
, mddev
);
4369 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4371 char b
[BDEVNAME_SIZE
];
4374 rdev
= find_rdev(mddev
, dev
);
4378 if (rdev
->raid_disk
>= 0)
4381 kick_rdev_from_array(rdev
);
4382 md_update_sb(mddev
, 1);
4383 md_new_event(mddev
);
4387 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4388 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4392 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4394 char b
[BDEVNAME_SIZE
];
4401 if (mddev
->major_version
!= 0) {
4402 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4403 " version-0 superblocks.\n",
4407 if (!mddev
->pers
->hot_add_disk
) {
4409 "%s: personality does not support diskops!\n",
4414 rdev
= md_import_device (dev
, -1, 0);
4417 "md: error, md_import_device() returned %ld\n",
4422 if (mddev
->persistent
)
4423 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4425 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4427 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4429 if (test_bit(Faulty
, &rdev
->flags
)) {
4431 "md: can not hot-add faulty %s disk to %s!\n",
4432 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4436 clear_bit(In_sync
, &rdev
->flags
);
4438 rdev
->saved_raid_disk
= -1;
4439 err
= bind_rdev_to_array(rdev
, mddev
);
4444 * The rest should better be atomic, we can have disk failures
4445 * noticed in interrupt contexts ...
4448 if (rdev
->desc_nr
== mddev
->max_disks
) {
4449 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4452 goto abort_unbind_export
;
4455 rdev
->raid_disk
= -1;
4457 md_update_sb(mddev
, 1);
4460 * Kick recovery, maybe this spare has to be added to the
4461 * array immediately.
4463 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4464 md_wakeup_thread(mddev
->thread
);
4465 md_new_event(mddev
);
4468 abort_unbind_export
:
4469 unbind_rdev_from_array(rdev
);
4476 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4481 if (!mddev
->pers
->quiesce
)
4483 if (mddev
->recovery
|| mddev
->sync_thread
)
4485 /* we should be able to change the bitmap.. */
4491 return -EEXIST
; /* cannot add when bitmap is present */
4492 mddev
->bitmap_file
= fget(fd
);
4494 if (mddev
->bitmap_file
== NULL
) {
4495 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4500 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4502 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4504 fput(mddev
->bitmap_file
);
4505 mddev
->bitmap_file
= NULL
;
4508 mddev
->bitmap_offset
= 0; /* file overrides offset */
4509 } else if (mddev
->bitmap
== NULL
)
4510 return -ENOENT
; /* cannot remove what isn't there */
4513 mddev
->pers
->quiesce(mddev
, 1);
4515 err
= bitmap_create(mddev
);
4516 if (fd
< 0 || err
) {
4517 bitmap_destroy(mddev
);
4518 fd
= -1; /* make sure to put the file */
4520 mddev
->pers
->quiesce(mddev
, 0);
4523 if (mddev
->bitmap_file
) {
4524 restore_bitmap_write_access(mddev
->bitmap_file
);
4525 fput(mddev
->bitmap_file
);
4527 mddev
->bitmap_file
= NULL
;
4534 * set_array_info is used two different ways
4535 * The original usage is when creating a new array.
4536 * In this usage, raid_disks is > 0 and it together with
4537 * level, size, not_persistent,layout,chunksize determine the
4538 * shape of the array.
4539 * This will always create an array with a type-0.90.0 superblock.
4540 * The newer usage is when assembling an array.
4541 * In this case raid_disks will be 0, and the major_version field is
4542 * use to determine which style super-blocks are to be found on the devices.
4543 * The minor and patch _version numbers are also kept incase the
4544 * super_block handler wishes to interpret them.
4546 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4549 if (info
->raid_disks
== 0) {
4550 /* just setting version number for superblock loading */
4551 if (info
->major_version
< 0 ||
4552 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4553 super_types
[info
->major_version
].name
== NULL
) {
4554 /* maybe try to auto-load a module? */
4556 "md: superblock version %d not known\n",
4557 info
->major_version
);
4560 mddev
->major_version
= info
->major_version
;
4561 mddev
->minor_version
= info
->minor_version
;
4562 mddev
->patch_version
= info
->patch_version
;
4563 mddev
->persistent
= !info
->not_persistent
;
4566 mddev
->major_version
= MD_MAJOR_VERSION
;
4567 mddev
->minor_version
= MD_MINOR_VERSION
;
4568 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4569 mddev
->ctime
= get_seconds();
4571 mddev
->level
= info
->level
;
4572 mddev
->clevel
[0] = 0;
4573 mddev
->size
= info
->size
;
4574 mddev
->raid_disks
= info
->raid_disks
;
4575 /* don't set md_minor, it is determined by which /dev/md* was
4578 if (info
->state
& (1<<MD_SB_CLEAN
))
4579 mddev
->recovery_cp
= MaxSector
;
4581 mddev
->recovery_cp
= 0;
4582 mddev
->persistent
= ! info
->not_persistent
;
4583 mddev
->external
= 0;
4585 mddev
->layout
= info
->layout
;
4586 mddev
->chunk_size
= info
->chunk_size
;
4588 mddev
->max_disks
= MD_SB_DISKS
;
4590 if (mddev
->persistent
)
4592 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4594 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4595 mddev
->bitmap_offset
= 0;
4597 mddev
->reshape_position
= MaxSector
;
4600 * Generate a 128 bit UUID
4602 get_random_bytes(mddev
->uuid
, 16);
4604 mddev
->new_level
= mddev
->level
;
4605 mddev
->new_chunk
= mddev
->chunk_size
;
4606 mddev
->new_layout
= mddev
->layout
;
4607 mddev
->delta_disks
= 0;
4612 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
4616 struct list_head
*tmp
;
4617 int fit
= (num_sectors
== 0);
4619 if (mddev
->pers
->resize
== NULL
)
4621 /* The "num_sectors" is the number of sectors of each device that
4622 * is used. This can only make sense for arrays with redundancy.
4623 * linear and raid0 always use whatever space is available. We can only
4624 * consider changing this number if no resync or reconstruction is
4625 * happening, and if the new size is acceptable. It must fit before the
4626 * sb_start or, if that is <data_offset, it must fit before the size
4627 * of each device. If num_sectors is zero, we find the largest size
4631 if (mddev
->sync_thread
)
4633 rdev_for_each(rdev
, tmp
, mddev
) {
4635 avail
= rdev
->size
* 2;
4637 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
4638 num_sectors
= avail
;
4639 if (avail
< num_sectors
)
4642 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
4644 struct block_device
*bdev
;
4646 bdev
= bdget_disk(mddev
->gendisk
, 0);
4648 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4649 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4650 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4657 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4660 /* change the number of raid disks */
4661 if (mddev
->pers
->check_reshape
== NULL
)
4663 if (raid_disks
<= 0 ||
4664 raid_disks
>= mddev
->max_disks
)
4666 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4668 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4670 rv
= mddev
->pers
->check_reshape(mddev
);
4676 * update_array_info is used to change the configuration of an
4678 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4679 * fields in the info are checked against the array.
4680 * Any differences that cannot be handled will cause an error.
4681 * Normally, only one change can be managed at a time.
4683 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4689 /* calculate expected state,ignoring low bits */
4690 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4691 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4693 if (mddev
->major_version
!= info
->major_version
||
4694 mddev
->minor_version
!= info
->minor_version
||
4695 /* mddev->patch_version != info->patch_version || */
4696 mddev
->ctime
!= info
->ctime
||
4697 mddev
->level
!= info
->level
||
4698 /* mddev->layout != info->layout || */
4699 !mddev
->persistent
!= info
->not_persistent
||
4700 mddev
->chunk_size
!= info
->chunk_size
||
4701 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4702 ((state
^info
->state
) & 0xfffffe00)
4705 /* Check there is only one change */
4706 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4707 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4708 if (mddev
->layout
!= info
->layout
) cnt
++;
4709 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4710 if (cnt
== 0) return 0;
4711 if (cnt
> 1) return -EINVAL
;
4713 if (mddev
->layout
!= info
->layout
) {
4715 * we don't need to do anything at the md level, the
4716 * personality will take care of it all.
4718 if (mddev
->pers
->reconfig
== NULL
)
4721 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4723 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4724 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
4726 if (mddev
->raid_disks
!= info
->raid_disks
)
4727 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4729 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4730 if (mddev
->pers
->quiesce
== NULL
)
4732 if (mddev
->recovery
|| mddev
->sync_thread
)
4734 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4735 /* add the bitmap */
4738 if (mddev
->default_bitmap_offset
== 0)
4740 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4741 mddev
->pers
->quiesce(mddev
, 1);
4742 rv
= bitmap_create(mddev
);
4744 bitmap_destroy(mddev
);
4745 mddev
->pers
->quiesce(mddev
, 0);
4747 /* remove the bitmap */
4750 if (mddev
->bitmap
->file
)
4752 mddev
->pers
->quiesce(mddev
, 1);
4753 bitmap_destroy(mddev
);
4754 mddev
->pers
->quiesce(mddev
, 0);
4755 mddev
->bitmap_offset
= 0;
4758 md_update_sb(mddev
, 1);
4762 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4766 if (mddev
->pers
== NULL
)
4769 rdev
= find_rdev(mddev
, dev
);
4773 md_error(mddev
, rdev
);
4778 * We have a problem here : there is no easy way to give a CHS
4779 * virtual geometry. We currently pretend that we have a 2 heads
4780 * 4 sectors (with a BIG number of cylinders...). This drives
4781 * dosfs just mad... ;-)
4783 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4785 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4789 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4793 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4794 unsigned int cmd
, unsigned long arg
)
4797 void __user
*argp
= (void __user
*)arg
;
4798 mddev_t
*mddev
= NULL
;
4800 if (!capable(CAP_SYS_ADMIN
))
4804 * Commands dealing with the RAID driver but not any
4810 err
= get_version(argp
);
4813 case PRINT_RAID_DEBUG
:
4821 autostart_arrays(arg
);
4828 * Commands creating/starting a new array:
4831 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4838 err
= mddev_lock(mddev
);
4841 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4848 case SET_ARRAY_INFO
:
4850 mdu_array_info_t info
;
4852 memset(&info
, 0, sizeof(info
));
4853 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4858 err
= update_array_info(mddev
, &info
);
4860 printk(KERN_WARNING
"md: couldn't update"
4861 " array info. %d\n", err
);
4866 if (!list_empty(&mddev
->disks
)) {
4868 "md: array %s already has disks!\n",
4873 if (mddev
->raid_disks
) {
4875 "md: array %s already initialised!\n",
4880 err
= set_array_info(mddev
, &info
);
4882 printk(KERN_WARNING
"md: couldn't set"
4883 " array info. %d\n", err
);
4893 * Commands querying/configuring an existing array:
4895 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4896 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4897 if ((!mddev
->raid_disks
&& !mddev
->external
)
4898 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4899 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4900 && cmd
!= GET_BITMAP_FILE
) {
4906 * Commands even a read-only array can execute:
4910 case GET_ARRAY_INFO
:
4911 err
= get_array_info(mddev
, argp
);
4914 case GET_BITMAP_FILE
:
4915 err
= get_bitmap_file(mddev
, argp
);
4919 err
= get_disk_info(mddev
, argp
);
4922 case RESTART_ARRAY_RW
:
4923 err
= restart_array(mddev
);
4927 err
= do_md_stop (mddev
, 0, 1);
4931 err
= do_md_stop (mddev
, 1, 1);
4937 * The remaining ioctls are changing the state of the
4938 * superblock, so we do not allow them on read-only arrays.
4939 * However non-MD ioctls (e.g. get-size) will still come through
4940 * here and hit the 'default' below, so only disallow
4941 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4943 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
4944 if (mddev
->ro
== 2) {
4946 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
4947 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4948 md_wakeup_thread(mddev
->thread
);
4959 mdu_disk_info_t info
;
4960 if (copy_from_user(&info
, argp
, sizeof(info
)))
4963 err
= add_new_disk(mddev
, &info
);
4967 case HOT_REMOVE_DISK
:
4968 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4972 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4975 case SET_DISK_FAULTY
:
4976 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4980 err
= do_md_run (mddev
);
4983 case SET_BITMAP_FILE
:
4984 err
= set_bitmap_file(mddev
, (int)arg
);
4994 mddev_unlock(mddev
);
5004 static int md_open(struct inode
*inode
, struct file
*file
)
5007 * Succeed if we can lock the mddev, which confirms that
5008 * it isn't being stopped right now.
5010 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
5013 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5018 mddev_unlock(mddev
);
5020 check_disk_change(inode
->i_bdev
);
5025 static int md_release(struct inode
*inode
, struct file
* file
)
5027 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
5035 static int md_media_changed(struct gendisk
*disk
)
5037 mddev_t
*mddev
= disk
->private_data
;
5039 return mddev
->changed
;
5042 static int md_revalidate(struct gendisk
*disk
)
5044 mddev_t
*mddev
= disk
->private_data
;
5049 static struct block_device_operations md_fops
=
5051 .owner
= THIS_MODULE
,
5053 .release
= md_release
,
5055 .getgeo
= md_getgeo
,
5056 .media_changed
= md_media_changed
,
5057 .revalidate_disk
= md_revalidate
,
5060 static int md_thread(void * arg
)
5062 mdk_thread_t
*thread
= arg
;
5065 * md_thread is a 'system-thread', it's priority should be very
5066 * high. We avoid resource deadlocks individually in each
5067 * raid personality. (RAID5 does preallocation) We also use RR and
5068 * the very same RT priority as kswapd, thus we will never get
5069 * into a priority inversion deadlock.
5071 * we definitely have to have equal or higher priority than
5072 * bdflush, otherwise bdflush will deadlock if there are too
5073 * many dirty RAID5 blocks.
5076 allow_signal(SIGKILL
);
5077 while (!kthread_should_stop()) {
5079 /* We need to wait INTERRUPTIBLE so that
5080 * we don't add to the load-average.
5081 * That means we need to be sure no signals are
5084 if (signal_pending(current
))
5085 flush_signals(current
);
5087 wait_event_interruptible_timeout
5089 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5090 || kthread_should_stop(),
5093 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5095 thread
->run(thread
->mddev
);
5101 void md_wakeup_thread(mdk_thread_t
*thread
)
5104 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5105 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5106 wake_up(&thread
->wqueue
);
5110 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5113 mdk_thread_t
*thread
;
5115 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5119 init_waitqueue_head(&thread
->wqueue
);
5122 thread
->mddev
= mddev
;
5123 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5124 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5125 if (IS_ERR(thread
->tsk
)) {
5132 void md_unregister_thread(mdk_thread_t
*thread
)
5134 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5136 kthread_stop(thread
->tsk
);
5140 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5147 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5150 if (mddev
->external
)
5151 set_bit(Blocked
, &rdev
->flags
);
5153 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5155 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5156 __builtin_return_address(0),__builtin_return_address(1),
5157 __builtin_return_address(2),__builtin_return_address(3));
5161 if (!mddev
->pers
->error_handler
)
5163 mddev
->pers
->error_handler(mddev
,rdev
);
5164 if (mddev
->degraded
)
5165 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5166 set_bit(StateChanged
, &rdev
->flags
);
5167 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5168 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5169 md_wakeup_thread(mddev
->thread
);
5170 md_new_event_inintr(mddev
);
5173 /* seq_file implementation /proc/mdstat */
5175 static void status_unused(struct seq_file
*seq
)
5179 struct list_head
*tmp
;
5181 seq_printf(seq
, "unused devices: ");
5183 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
) {
5184 char b
[BDEVNAME_SIZE
];
5186 seq_printf(seq
, "%s ",
5187 bdevname(rdev
->bdev
,b
));
5190 seq_printf(seq
, "<none>");
5192 seq_printf(seq
, "\n");
5196 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5198 sector_t max_blocks
, resync
, res
;
5199 unsigned long dt
, db
, rt
;
5201 unsigned int per_milli
;
5203 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5205 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5206 max_blocks
= mddev
->resync_max_sectors
>> 1;
5208 max_blocks
= mddev
->size
;
5211 * Should not happen.
5217 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5218 * in a sector_t, and (max_blocks>>scale) will fit in a
5219 * u32, as those are the requirements for sector_div.
5220 * Thus 'scale' must be at least 10
5223 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5224 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5227 res
= (resync
>>scale
)*1000;
5228 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5232 int i
, x
= per_milli
/50, y
= 20-x
;
5233 seq_printf(seq
, "[");
5234 for (i
= 0; i
< x
; i
++)
5235 seq_printf(seq
, "=");
5236 seq_printf(seq
, ">");
5237 for (i
= 0; i
< y
; i
++)
5238 seq_printf(seq
, ".");
5239 seq_printf(seq
, "] ");
5241 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5242 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5244 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5246 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5247 "resync" : "recovery"))),
5248 per_milli
/10, per_milli
% 10,
5249 (unsigned long long) resync
,
5250 (unsigned long long) max_blocks
);
5253 * We do not want to overflow, so the order of operands and
5254 * the * 100 / 100 trick are important. We do a +1 to be
5255 * safe against division by zero. We only estimate anyway.
5257 * dt: time from mark until now
5258 * db: blocks written from mark until now
5259 * rt: remaining time
5261 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5263 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5264 - mddev
->resync_mark_cnt
;
5265 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5267 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5269 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5272 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5274 struct list_head
*tmp
;
5284 spin_lock(&all_mddevs_lock
);
5285 list_for_each(tmp
,&all_mddevs
)
5287 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5289 spin_unlock(&all_mddevs_lock
);
5292 spin_unlock(&all_mddevs_lock
);
5294 return (void*)2;/* tail */
5298 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5300 struct list_head
*tmp
;
5301 mddev_t
*next_mddev
, *mddev
= v
;
5307 spin_lock(&all_mddevs_lock
);
5309 tmp
= all_mddevs
.next
;
5311 tmp
= mddev
->all_mddevs
.next
;
5312 if (tmp
!= &all_mddevs
)
5313 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5315 next_mddev
= (void*)2;
5318 spin_unlock(&all_mddevs_lock
);
5326 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5330 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5334 struct mdstat_info
{
5338 static int md_seq_show(struct seq_file
*seq
, void *v
)
5342 struct list_head
*tmp2
;
5344 struct mdstat_info
*mi
= seq
->private;
5345 struct bitmap
*bitmap
;
5347 if (v
== (void*)1) {
5348 struct mdk_personality
*pers
;
5349 seq_printf(seq
, "Personalities : ");
5350 spin_lock(&pers_lock
);
5351 list_for_each_entry(pers
, &pers_list
, list
)
5352 seq_printf(seq
, "[%s] ", pers
->name
);
5354 spin_unlock(&pers_lock
);
5355 seq_printf(seq
, "\n");
5356 mi
->event
= atomic_read(&md_event_count
);
5359 if (v
== (void*)2) {
5364 if (mddev_lock(mddev
) < 0)
5367 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5368 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5369 mddev
->pers
? "" : "in");
5372 seq_printf(seq
, " (read-only)");
5374 seq_printf(seq
, " (auto-read-only)");
5375 seq_printf(seq
, " %s", mddev
->pers
->name
);
5379 rdev_for_each(rdev
, tmp2
, mddev
) {
5380 char b
[BDEVNAME_SIZE
];
5381 seq_printf(seq
, " %s[%d]",
5382 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5383 if (test_bit(WriteMostly
, &rdev
->flags
))
5384 seq_printf(seq
, "(W)");
5385 if (test_bit(Faulty
, &rdev
->flags
)) {
5386 seq_printf(seq
, "(F)");
5388 } else if (rdev
->raid_disk
< 0)
5389 seq_printf(seq
, "(S)"); /* spare */
5393 if (!list_empty(&mddev
->disks
)) {
5395 seq_printf(seq
, "\n %llu blocks",
5396 (unsigned long long)mddev
->array_size
);
5398 seq_printf(seq
, "\n %llu blocks",
5399 (unsigned long long)size
);
5401 if (mddev
->persistent
) {
5402 if (mddev
->major_version
!= 0 ||
5403 mddev
->minor_version
!= 90) {
5404 seq_printf(seq
," super %d.%d",
5405 mddev
->major_version
,
5406 mddev
->minor_version
);
5408 } else if (mddev
->external
)
5409 seq_printf(seq
, " super external:%s",
5410 mddev
->metadata_type
);
5412 seq_printf(seq
, " super non-persistent");
5415 mddev
->pers
->status (seq
, mddev
);
5416 seq_printf(seq
, "\n ");
5417 if (mddev
->pers
->sync_request
) {
5418 if (mddev
->curr_resync
> 2) {
5419 status_resync (seq
, mddev
);
5420 seq_printf(seq
, "\n ");
5421 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5422 seq_printf(seq
, "\tresync=DELAYED\n ");
5423 else if (mddev
->recovery_cp
< MaxSector
)
5424 seq_printf(seq
, "\tresync=PENDING\n ");
5427 seq_printf(seq
, "\n ");
5429 if ((bitmap
= mddev
->bitmap
)) {
5430 unsigned long chunk_kb
;
5431 unsigned long flags
;
5432 spin_lock_irqsave(&bitmap
->lock
, flags
);
5433 chunk_kb
= bitmap
->chunksize
>> 10;
5434 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5436 bitmap
->pages
- bitmap
->missing_pages
,
5438 (bitmap
->pages
- bitmap
->missing_pages
)
5439 << (PAGE_SHIFT
- 10),
5440 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5441 chunk_kb
? "KB" : "B");
5443 seq_printf(seq
, ", file: ");
5444 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5447 seq_printf(seq
, "\n");
5448 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5451 seq_printf(seq
, "\n");
5453 mddev_unlock(mddev
);
5458 static struct seq_operations md_seq_ops
= {
5459 .start
= md_seq_start
,
5460 .next
= md_seq_next
,
5461 .stop
= md_seq_stop
,
5462 .show
= md_seq_show
,
5465 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5468 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5472 error
= seq_open(file
, &md_seq_ops
);
5476 struct seq_file
*p
= file
->private_data
;
5478 mi
->event
= atomic_read(&md_event_count
);
5483 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5485 struct seq_file
*m
= filp
->private_data
;
5486 struct mdstat_info
*mi
= m
->private;
5489 poll_wait(filp
, &md_event_waiters
, wait
);
5491 /* always allow read */
5492 mask
= POLLIN
| POLLRDNORM
;
5494 if (mi
->event
!= atomic_read(&md_event_count
))
5495 mask
|= POLLERR
| POLLPRI
;
5499 static const struct file_operations md_seq_fops
= {
5500 .owner
= THIS_MODULE
,
5501 .open
= md_seq_open
,
5503 .llseek
= seq_lseek
,
5504 .release
= seq_release_private
,
5505 .poll
= mdstat_poll
,
5508 int register_md_personality(struct mdk_personality
*p
)
5510 spin_lock(&pers_lock
);
5511 list_add_tail(&p
->list
, &pers_list
);
5512 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5513 spin_unlock(&pers_lock
);
5517 int unregister_md_personality(struct mdk_personality
*p
)
5519 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5520 spin_lock(&pers_lock
);
5521 list_del_init(&p
->list
);
5522 spin_unlock(&pers_lock
);
5526 static int is_mddev_idle(mddev_t
*mddev
)
5529 struct list_head
*tmp
;
5534 rdev_for_each(rdev
, tmp
, mddev
) {
5535 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5536 curr_events
= disk_stat_read(disk
, sectors
[0]) +
5537 disk_stat_read(disk
, sectors
[1]) -
5538 atomic_read(&disk
->sync_io
);
5539 /* sync IO will cause sync_io to increase before the disk_stats
5540 * as sync_io is counted when a request starts, and
5541 * disk_stats is counted when it completes.
5542 * So resync activity will cause curr_events to be smaller than
5543 * when there was no such activity.
5544 * non-sync IO will cause disk_stat to increase without
5545 * increasing sync_io so curr_events will (eventually)
5546 * be larger than it was before. Once it becomes
5547 * substantially larger, the test below will cause
5548 * the array to appear non-idle, and resync will slow
5550 * If there is a lot of outstanding resync activity when
5551 * we set last_event to curr_events, then all that activity
5552 * completing might cause the array to appear non-idle
5553 * and resync will be slowed down even though there might
5554 * not have been non-resync activity. This will only
5555 * happen once though. 'last_events' will soon reflect
5556 * the state where there is little or no outstanding
5557 * resync requests, and further resync activity will
5558 * always make curr_events less than last_events.
5561 if (curr_events
- rdev
->last_events
> 4096) {
5562 rdev
->last_events
= curr_events
;
5569 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5571 /* another "blocks" (512byte) blocks have been synced */
5572 atomic_sub(blocks
, &mddev
->recovery_active
);
5573 wake_up(&mddev
->recovery_wait
);
5575 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5576 md_wakeup_thread(mddev
->thread
);
5577 // stop recovery, signal do_sync ....
5582 /* md_write_start(mddev, bi)
5583 * If we need to update some array metadata (e.g. 'active' flag
5584 * in superblock) before writing, schedule a superblock update
5585 * and wait for it to complete.
5587 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5590 if (bio_data_dir(bi
) != WRITE
)
5593 BUG_ON(mddev
->ro
== 1);
5594 if (mddev
->ro
== 2) {
5595 /* need to switch to read/write */
5597 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5598 md_wakeup_thread(mddev
->thread
);
5599 md_wakeup_thread(mddev
->sync_thread
);
5602 atomic_inc(&mddev
->writes_pending
);
5603 if (mddev
->safemode
== 1)
5604 mddev
->safemode
= 0;
5605 if (mddev
->in_sync
) {
5606 spin_lock_irq(&mddev
->write_lock
);
5607 if (mddev
->in_sync
) {
5609 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5610 md_wakeup_thread(mddev
->thread
);
5613 spin_unlock_irq(&mddev
->write_lock
);
5616 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5617 wait_event(mddev
->sb_wait
,
5618 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5619 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5622 void md_write_end(mddev_t
*mddev
)
5624 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5625 if (mddev
->safemode
== 2)
5626 md_wakeup_thread(mddev
->thread
);
5627 else if (mddev
->safemode_delay
)
5628 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5632 /* md_allow_write(mddev)
5633 * Calling this ensures that the array is marked 'active' so that writes
5634 * may proceed without blocking. It is important to call this before
5635 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5636 * Must be called with mddev_lock held.
5638 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5639 * is dropped, so return -EAGAIN after notifying userspace.
5641 int md_allow_write(mddev_t
*mddev
)
5647 if (!mddev
->pers
->sync_request
)
5650 spin_lock_irq(&mddev
->write_lock
);
5651 if (mddev
->in_sync
) {
5653 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5654 if (mddev
->safemode_delay
&&
5655 mddev
->safemode
== 0)
5656 mddev
->safemode
= 1;
5657 spin_unlock_irq(&mddev
->write_lock
);
5658 md_update_sb(mddev
, 0);
5659 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5661 spin_unlock_irq(&mddev
->write_lock
);
5663 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
5668 EXPORT_SYMBOL_GPL(md_allow_write
);
5670 #define SYNC_MARKS 10
5671 #define SYNC_MARK_STEP (3*HZ)
5672 void md_do_sync(mddev_t
*mddev
)
5675 unsigned int currspeed
= 0,
5677 sector_t max_sectors
,j
, io_sectors
;
5678 unsigned long mark
[SYNC_MARKS
];
5679 sector_t mark_cnt
[SYNC_MARKS
];
5681 struct list_head
*tmp
;
5682 sector_t last_check
;
5684 struct list_head
*rtmp
;
5688 /* just incase thread restarts... */
5689 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5691 if (mddev
->ro
) /* never try to sync a read-only array */
5694 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5695 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5696 desc
= "data-check";
5697 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5698 desc
= "requested-resync";
5701 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5706 /* we overload curr_resync somewhat here.
5707 * 0 == not engaged in resync at all
5708 * 2 == checking that there is no conflict with another sync
5709 * 1 == like 2, but have yielded to allow conflicting resync to
5711 * other == active in resync - this many blocks
5713 * Before starting a resync we must have set curr_resync to
5714 * 2, and then checked that every "conflicting" array has curr_resync
5715 * less than ours. When we find one that is the same or higher
5716 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5717 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5718 * This will mean we have to start checking from the beginning again.
5723 mddev
->curr_resync
= 2;
5726 if (kthread_should_stop()) {
5727 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5730 for_each_mddev(mddev2
, tmp
) {
5731 if (mddev2
== mddev
)
5733 if (!mddev
->parallel_resync
5734 && mddev2
->curr_resync
5735 && match_mddev_units(mddev
, mddev2
)) {
5737 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5738 /* arbitrarily yield */
5739 mddev
->curr_resync
= 1;
5740 wake_up(&resync_wait
);
5742 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5743 /* no need to wait here, we can wait the next
5744 * time 'round when curr_resync == 2
5747 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5748 if (!kthread_should_stop() &&
5749 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5750 printk(KERN_INFO
"md: delaying %s of %s"
5751 " until %s has finished (they"
5752 " share one or more physical units)\n",
5753 desc
, mdname(mddev
), mdname(mddev2
));
5756 finish_wait(&resync_wait
, &wq
);
5759 finish_wait(&resync_wait
, &wq
);
5762 } while (mddev
->curr_resync
< 2);
5765 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5766 /* resync follows the size requested by the personality,
5767 * which defaults to physical size, but can be virtual size
5769 max_sectors
= mddev
->resync_max_sectors
;
5770 mddev
->resync_mismatches
= 0;
5771 /* we don't use the checkpoint if there's a bitmap */
5772 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5773 j
= mddev
->resync_min
;
5774 else if (!mddev
->bitmap
)
5775 j
= mddev
->recovery_cp
;
5777 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5778 max_sectors
= mddev
->size
<< 1;
5780 /* recovery follows the physical size of devices */
5781 max_sectors
= mddev
->size
<< 1;
5783 rdev_for_each(rdev
, rtmp
, mddev
)
5784 if (rdev
->raid_disk
>= 0 &&
5785 !test_bit(Faulty
, &rdev
->flags
) &&
5786 !test_bit(In_sync
, &rdev
->flags
) &&
5787 rdev
->recovery_offset
< j
)
5788 j
= rdev
->recovery_offset
;
5791 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5792 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5793 " %d KB/sec/disk.\n", speed_min(mddev
));
5794 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5795 "(but not more than %d KB/sec) for %s.\n",
5796 speed_max(mddev
), desc
);
5798 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5801 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5803 mark_cnt
[m
] = io_sectors
;
5806 mddev
->resync_mark
= mark
[last_mark
];
5807 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5810 * Tune reconstruction:
5812 window
= 32*(PAGE_SIZE
/512);
5813 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5814 window
/2,(unsigned long long) max_sectors
/2);
5816 atomic_set(&mddev
->recovery_active
, 0);
5821 "md: resuming %s of %s from checkpoint.\n",
5822 desc
, mdname(mddev
));
5823 mddev
->curr_resync
= j
;
5826 while (j
< max_sectors
) {
5830 if (j
>= mddev
->resync_max
) {
5831 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5832 wait_event(mddev
->recovery_wait
,
5833 mddev
->resync_max
> j
5834 || kthread_should_stop());
5836 if (kthread_should_stop())
5838 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5839 currspeed
< speed_min(mddev
));
5841 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5845 if (!skipped
) { /* actual IO requested */
5846 io_sectors
+= sectors
;
5847 atomic_add(sectors
, &mddev
->recovery_active
);
5851 if (j
>1) mddev
->curr_resync
= j
;
5852 mddev
->curr_mark_cnt
= io_sectors
;
5853 if (last_check
== 0)
5854 /* this is the earliers that rebuilt will be
5855 * visible in /proc/mdstat
5857 md_new_event(mddev
);
5859 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5862 last_check
= io_sectors
;
5864 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5868 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5870 int next
= (last_mark
+1) % SYNC_MARKS
;
5872 mddev
->resync_mark
= mark
[next
];
5873 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5874 mark
[next
] = jiffies
;
5875 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5880 if (kthread_should_stop())
5885 * this loop exits only if either when we are slower than
5886 * the 'hard' speed limit, or the system was IO-idle for
5888 * the system might be non-idle CPU-wise, but we only care
5889 * about not overloading the IO subsystem. (things like an
5890 * e2fsck being done on the RAID array should execute fast)
5892 blk_unplug(mddev
->queue
);
5895 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5896 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5898 if (currspeed
> speed_min(mddev
)) {
5899 if ((currspeed
> speed_max(mddev
)) ||
5900 !is_mddev_idle(mddev
)) {
5906 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5908 * this also signals 'finished resyncing' to md_stop
5911 blk_unplug(mddev
->queue
);
5913 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5915 /* tell personality that we are finished */
5916 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5918 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5919 mddev
->curr_resync
> 2) {
5920 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5921 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5922 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5924 "md: checkpointing %s of %s.\n",
5925 desc
, mdname(mddev
));
5926 mddev
->recovery_cp
= mddev
->curr_resync
;
5929 mddev
->recovery_cp
= MaxSector
;
5931 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5932 mddev
->curr_resync
= MaxSector
;
5933 rdev_for_each(rdev
, rtmp
, mddev
)
5934 if (rdev
->raid_disk
>= 0 &&
5935 !test_bit(Faulty
, &rdev
->flags
) &&
5936 !test_bit(In_sync
, &rdev
->flags
) &&
5937 rdev
->recovery_offset
< mddev
->curr_resync
)
5938 rdev
->recovery_offset
= mddev
->curr_resync
;
5941 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5944 mddev
->curr_resync
= 0;
5945 mddev
->resync_min
= 0;
5946 mddev
->resync_max
= MaxSector
;
5947 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5948 wake_up(&resync_wait
);
5949 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5950 md_wakeup_thread(mddev
->thread
);
5955 * got a signal, exit.
5958 "md: md_do_sync() got signal ... exiting\n");
5959 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5963 EXPORT_SYMBOL_GPL(md_do_sync
);
5966 static int remove_and_add_spares(mddev_t
*mddev
)
5969 struct list_head
*rtmp
;
5972 rdev_for_each(rdev
, rtmp
, mddev
)
5973 if (rdev
->raid_disk
>= 0 &&
5974 !test_bit(Blocked
, &rdev
->flags
) &&
5975 (test_bit(Faulty
, &rdev
->flags
) ||
5976 ! test_bit(In_sync
, &rdev
->flags
)) &&
5977 atomic_read(&rdev
->nr_pending
)==0) {
5978 if (mddev
->pers
->hot_remove_disk(
5979 mddev
, rdev
->raid_disk
)==0) {
5981 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5982 sysfs_remove_link(&mddev
->kobj
, nm
);
5983 rdev
->raid_disk
= -1;
5987 if (mddev
->degraded
) {
5988 rdev_for_each(rdev
, rtmp
, mddev
) {
5989 if (rdev
->raid_disk
>= 0 &&
5990 !test_bit(In_sync
, &rdev
->flags
))
5992 if (rdev
->raid_disk
< 0
5993 && !test_bit(Faulty
, &rdev
->flags
)) {
5994 rdev
->recovery_offset
= 0;
5996 hot_add_disk(mddev
, rdev
) == 0) {
5998 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5999 if (sysfs_create_link(&mddev
->kobj
,
6002 "md: cannot register "
6006 md_new_event(mddev
);
6015 * This routine is regularly called by all per-raid-array threads to
6016 * deal with generic issues like resync and super-block update.
6017 * Raid personalities that don't have a thread (linear/raid0) do not
6018 * need this as they never do any recovery or update the superblock.
6020 * It does not do any resync itself, but rather "forks" off other threads
6021 * to do that as needed.
6022 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6023 * "->recovery" and create a thread at ->sync_thread.
6024 * When the thread finishes it sets MD_RECOVERY_DONE
6025 * and wakeups up this thread which will reap the thread and finish up.
6026 * This thread also removes any faulty devices (with nr_pending == 0).
6028 * The overall approach is:
6029 * 1/ if the superblock needs updating, update it.
6030 * 2/ If a recovery thread is running, don't do anything else.
6031 * 3/ If recovery has finished, clean up, possibly marking spares active.
6032 * 4/ If there are any faulty devices, remove them.
6033 * 5/ If array is degraded, try to add spares devices
6034 * 6/ If array has spares or is not in-sync, start a resync thread.
6036 void md_check_recovery(mddev_t
*mddev
)
6039 struct list_head
*rtmp
;
6043 bitmap_daemon_work(mddev
->bitmap
);
6048 if (signal_pending(current
)) {
6049 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6050 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6052 mddev
->safemode
= 2;
6054 flush_signals(current
);
6058 (mddev
->flags
&& !mddev
->external
) ||
6059 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6060 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6061 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6062 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6063 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6067 if (mddev_trylock(mddev
)) {
6070 if (!mddev
->external
) {
6072 spin_lock_irq(&mddev
->write_lock
);
6073 if (mddev
->safemode
&&
6074 !atomic_read(&mddev
->writes_pending
) &&
6076 mddev
->recovery_cp
== MaxSector
) {
6079 if (mddev
->persistent
)
6080 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6082 if (mddev
->safemode
== 1)
6083 mddev
->safemode
= 0;
6084 spin_unlock_irq(&mddev
->write_lock
);
6086 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
6090 md_update_sb(mddev
, 0);
6092 rdev_for_each(rdev
, rtmp
, mddev
)
6093 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6094 sysfs_notify(&rdev
->kobj
, NULL
, "state");
6097 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6098 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6099 /* resync/recovery still happening */
6100 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6103 if (mddev
->sync_thread
) {
6104 /* resync has finished, collect result */
6105 md_unregister_thread(mddev
->sync_thread
);
6106 mddev
->sync_thread
= NULL
;
6107 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6109 /* activate any spares */
6110 if (mddev
->pers
->spare_active(mddev
))
6111 sysfs_notify(&mddev
->kobj
, NULL
,
6114 md_update_sb(mddev
, 1);
6116 /* if array is no-longer degraded, then any saved_raid_disk
6117 * information must be scrapped
6119 if (!mddev
->degraded
)
6120 rdev_for_each(rdev
, rtmp
, mddev
)
6121 rdev
->saved_raid_disk
= -1;
6123 mddev
->recovery
= 0;
6124 /* flag recovery needed just to double check */
6125 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6126 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6127 md_new_event(mddev
);
6130 /* Set RUNNING before clearing NEEDED to avoid
6131 * any transients in the value of "sync_action".
6133 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6134 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6135 /* Clear some bits that don't mean anything, but
6138 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6139 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6141 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6143 /* no recovery is running.
6144 * remove any failed drives, then
6145 * add spares if possible.
6146 * Spare are also removed and re-added, to allow
6147 * the personality to fail the re-add.
6150 if (mddev
->reshape_position
!= MaxSector
) {
6151 if (mddev
->pers
->check_reshape(mddev
) != 0)
6152 /* Cannot proceed */
6154 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6155 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6156 } else if ((spares
= remove_and_add_spares(mddev
))) {
6157 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6158 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6159 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6160 } else if (mddev
->recovery_cp
< MaxSector
) {
6161 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6162 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6163 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6164 /* nothing to be done ... */
6167 if (mddev
->pers
->sync_request
) {
6168 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6169 /* We are adding a device or devices to an array
6170 * which has the bitmap stored on all devices.
6171 * So make sure all bitmap pages get written
6173 bitmap_write_all(mddev
->bitmap
);
6175 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6178 if (!mddev
->sync_thread
) {
6179 printk(KERN_ERR
"%s: could not start resync"
6182 /* leave the spares where they are, it shouldn't hurt */
6183 mddev
->recovery
= 0;
6185 md_wakeup_thread(mddev
->sync_thread
);
6186 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6187 md_new_event(mddev
);
6190 if (!mddev
->sync_thread
) {
6191 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6192 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6194 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6196 mddev_unlock(mddev
);
6200 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6202 sysfs_notify(&rdev
->kobj
, NULL
, "state");
6203 wait_event_timeout(rdev
->blocked_wait
,
6204 !test_bit(Blocked
, &rdev
->flags
),
6205 msecs_to_jiffies(5000));
6206 rdev_dec_pending(rdev
, mddev
);
6208 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6210 static int md_notify_reboot(struct notifier_block
*this,
6211 unsigned long code
, void *x
)
6213 struct list_head
*tmp
;
6216 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6218 printk(KERN_INFO
"md: stopping all md devices.\n");
6220 for_each_mddev(mddev
, tmp
)
6221 if (mddev_trylock(mddev
)) {
6222 do_md_stop (mddev
, 1, 0);
6223 mddev_unlock(mddev
);
6226 * certain more exotic SCSI devices are known to be
6227 * volatile wrt too early system reboots. While the
6228 * right place to handle this issue is the given
6229 * driver, we do want to have a safe RAID driver ...
6236 static struct notifier_block md_notifier
= {
6237 .notifier_call
= md_notify_reboot
,
6239 .priority
= INT_MAX
, /* before any real devices */
6242 static void md_geninit(void)
6244 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6246 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6249 static int __init
md_init(void)
6251 if (register_blkdev(MAJOR_NR
, "md"))
6253 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6254 unregister_blkdev(MAJOR_NR
, "md");
6257 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6258 md_probe
, NULL
, NULL
);
6259 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6260 md_probe
, NULL
, NULL
);
6262 register_reboot_notifier(&md_notifier
);
6263 raid_table_header
= register_sysctl_table(raid_root_table
);
6273 * Searches all registered partitions for autorun RAID arrays
6277 static LIST_HEAD(all_detected_devices
);
6278 struct detected_devices_node
{
6279 struct list_head list
;
6283 void md_autodetect_dev(dev_t dev
)
6285 struct detected_devices_node
*node_detected_dev
;
6287 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6288 if (node_detected_dev
) {
6289 node_detected_dev
->dev
= dev
;
6290 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6292 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6293 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6298 static void autostart_arrays(int part
)
6301 struct detected_devices_node
*node_detected_dev
;
6303 int i_scanned
, i_passed
;
6308 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6310 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6312 node_detected_dev
= list_entry(all_detected_devices
.next
,
6313 struct detected_devices_node
, list
);
6314 list_del(&node_detected_dev
->list
);
6315 dev
= node_detected_dev
->dev
;
6316 kfree(node_detected_dev
);
6317 rdev
= md_import_device(dev
,0, 90);
6321 if (test_bit(Faulty
, &rdev
->flags
)) {
6325 set_bit(AutoDetected
, &rdev
->flags
);
6326 list_add(&rdev
->same_set
, &pending_raid_disks
);
6330 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6331 i_scanned
, i_passed
);
6333 autorun_devices(part
);
6336 #endif /* !MODULE */
6338 static __exit
void md_exit(void)
6341 struct list_head
*tmp
;
6343 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6344 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6346 unregister_blkdev(MAJOR_NR
,"md");
6347 unregister_blkdev(mdp_major
, "mdp");
6348 unregister_reboot_notifier(&md_notifier
);
6349 unregister_sysctl_table(raid_table_header
);
6350 remove_proc_entry("mdstat", NULL
);
6351 for_each_mddev(mddev
, tmp
) {
6352 struct gendisk
*disk
= mddev
->gendisk
;
6355 export_array(mddev
);
6358 mddev
->gendisk
= NULL
;
6363 subsys_initcall(md_init
);
6364 module_exit(md_exit
)
6366 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6368 return sprintf(buffer
, "%d", start_readonly
);
6370 static int set_ro(const char *val
, struct kernel_param
*kp
)
6373 int num
= simple_strtoul(val
, &e
, 10);
6374 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6375 start_readonly
= num
;
6381 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6382 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6385 EXPORT_SYMBOL(register_md_personality
);
6386 EXPORT_SYMBOL(unregister_md_personality
);
6387 EXPORT_SYMBOL(md_error
);
6388 EXPORT_SYMBOL(md_done_sync
);
6389 EXPORT_SYMBOL(md_write_start
);
6390 EXPORT_SYMBOL(md_write_end
);
6391 EXPORT_SYMBOL(md_register_thread
);
6392 EXPORT_SYMBOL(md_unregister_thread
);
6393 EXPORT_SYMBOL(md_wakeup_thread
);
6394 EXPORT_SYMBOL(md_check_recovery
);
6395 MODULE_LICENSE("GPL");
6397 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);