2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/raid/md.h>
37 #include <linux/raid/bitmap.h>
38 #include <linux/sysctl.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
49 #define MAJOR_NR MD_MAJOR
51 /* 63 partitions with the alternate major number (mdp) */
52 #define MdpMinorShift 6
55 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59 static void autostart_arrays(int part
);
62 static LIST_HEAD(pers_list
);
63 static DEFINE_SPINLOCK(pers_lock
);
65 static void md_print_devices(void);
67 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
69 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
72 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
73 * is 1000 KB/sec, so the extra system load does not show up that much.
74 * Increase it if you want to have more _guaranteed_ speed. Note that
75 * the RAID driver will use the maximum available bandwidth if the IO
76 * subsystem is idle. There is also an 'absolute maximum' reconstruction
77 * speed limit - in case reconstruction slows down your system despite
80 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
81 * or /sys/block/mdX/md/sync_speed_{min,max}
84 static int sysctl_speed_limit_min
= 1000;
85 static int sysctl_speed_limit_max
= 200000;
86 static inline int speed_min(mddev_t
*mddev
)
88 return mddev
->sync_speed_min
?
89 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
92 static inline int speed_max(mddev_t
*mddev
)
94 return mddev
->sync_speed_max
?
95 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
98 static struct ctl_table_header
*raid_table_header
;
100 static ctl_table raid_table
[] = {
102 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
103 .procname
= "speed_limit_min",
104 .data
= &sysctl_speed_limit_min
,
105 .maxlen
= sizeof(int),
106 .mode
= S_IRUGO
|S_IWUSR
,
107 .proc_handler
= &proc_dointvec
,
110 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
111 .procname
= "speed_limit_max",
112 .data
= &sysctl_speed_limit_max
,
113 .maxlen
= sizeof(int),
114 .mode
= S_IRUGO
|S_IWUSR
,
115 .proc_handler
= &proc_dointvec
,
120 static ctl_table raid_dir_table
[] = {
122 .ctl_name
= DEV_RAID
,
125 .mode
= S_IRUGO
|S_IXUGO
,
131 static ctl_table raid_root_table
[] = {
137 .child
= raid_dir_table
,
142 static struct block_device_operations md_fops
;
144 static int start_readonly
;
147 * We have a system wide 'event count' that is incremented
148 * on any 'interesting' event, and readers of /proc/mdstat
149 * can use 'poll' or 'select' to find out when the event
153 * start array, stop array, error, add device, remove device,
154 * start build, activate spare
156 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
157 static atomic_t md_event_count
;
158 void md_new_event(mddev_t
*mddev
)
160 atomic_inc(&md_event_count
);
161 wake_up(&md_event_waiters
);
163 EXPORT_SYMBOL_GPL(md_new_event
);
165 /* Alternate version that can be called from interrupts
166 * when calling sysfs_notify isn't needed.
168 static void md_new_event_inintr(mddev_t
*mddev
)
170 atomic_inc(&md_event_count
);
171 wake_up(&md_event_waiters
);
175 * Enables to iterate over all existing md arrays
176 * all_mddevs_lock protects this list.
178 static LIST_HEAD(all_mddevs
);
179 static DEFINE_SPINLOCK(all_mddevs_lock
);
183 * iterates through all used mddevs in the system.
184 * We take care to grab the all_mddevs_lock whenever navigating
185 * the list, and to always hold a refcount when unlocked.
186 * Any code which breaks out of this loop while own
187 * a reference to the current mddev and must mddev_put it.
189 #define for_each_mddev(mddev,tmp) \
191 for (({ spin_lock(&all_mddevs_lock); \
192 tmp = all_mddevs.next; \
194 ({ if (tmp != &all_mddevs) \
195 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
196 spin_unlock(&all_mddevs_lock); \
197 if (mddev) mddev_put(mddev); \
198 mddev = list_entry(tmp, mddev_t, all_mddevs); \
199 tmp != &all_mddevs;}); \
200 ({ spin_lock(&all_mddevs_lock); \
205 static int md_fail_request(struct request_queue
*q
, struct bio
*bio
)
211 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
213 atomic_inc(&mddev
->active
);
217 static void mddev_put(mddev_t
*mddev
)
219 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
221 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
222 list_del(&mddev
->all_mddevs
);
223 spin_unlock(&all_mddevs_lock
);
224 blk_cleanup_queue(mddev
->queue
);
225 kobject_put(&mddev
->kobj
);
227 spin_unlock(&all_mddevs_lock
);
230 static mddev_t
* mddev_find(dev_t unit
)
232 mddev_t
*mddev
, *new = NULL
;
235 spin_lock(&all_mddevs_lock
);
236 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
237 if (mddev
->unit
== unit
) {
239 spin_unlock(&all_mddevs_lock
);
245 list_add(&new->all_mddevs
, &all_mddevs
);
246 spin_unlock(&all_mddevs_lock
);
249 spin_unlock(&all_mddevs_lock
);
251 new = kzalloc(sizeof(*new), GFP_KERNEL
);
256 if (MAJOR(unit
) == MD_MAJOR
)
257 new->md_minor
= MINOR(unit
);
259 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
261 mutex_init(&new->reconfig_mutex
);
262 INIT_LIST_HEAD(&new->disks
);
263 INIT_LIST_HEAD(&new->all_mddevs
);
264 init_timer(&new->safemode_timer
);
265 atomic_set(&new->active
, 1);
266 atomic_set(&new->openers
, 0);
267 spin_lock_init(&new->write_lock
);
268 init_waitqueue_head(&new->sb_wait
);
269 init_waitqueue_head(&new->recovery_wait
);
270 new->reshape_position
= MaxSector
;
272 new->resync_max
= MaxSector
;
273 new->level
= LEVEL_NONE
;
275 new->queue
= blk_alloc_queue(GFP_KERNEL
);
280 /* Can be unlocked because the queue is new: no concurrency */
281 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, new->queue
);
283 blk_queue_make_request(new->queue
, md_fail_request
);
288 static inline int mddev_lock(mddev_t
* mddev
)
290 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
293 static inline int mddev_trylock(mddev_t
* mddev
)
295 return mutex_trylock(&mddev
->reconfig_mutex
);
298 static inline void mddev_unlock(mddev_t
* mddev
)
300 mutex_unlock(&mddev
->reconfig_mutex
);
302 md_wakeup_thread(mddev
->thread
);
305 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
308 struct list_head
*tmp
;
310 rdev_for_each(rdev
, tmp
, mddev
) {
311 if (rdev
->desc_nr
== nr
)
317 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
319 struct list_head
*tmp
;
322 rdev_for_each(rdev
, tmp
, mddev
) {
323 if (rdev
->bdev
->bd_dev
== dev
)
329 static struct mdk_personality
*find_pers(int level
, char *clevel
)
331 struct mdk_personality
*pers
;
332 list_for_each_entry(pers
, &pers_list
, list
) {
333 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
335 if (strcmp(pers
->name
, clevel
)==0)
341 /* return the offset of the super block in 512byte sectors */
342 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
344 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
345 return MD_NEW_SIZE_SECTORS(num_sectors
);
348 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
350 sector_t num_sectors
= rdev
->sb_start
;
353 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
357 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
362 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
363 if (!rdev
->sb_page
) {
364 printk(KERN_ALERT
"md: out of memory.\n");
371 static void free_disk_sb(mdk_rdev_t
* rdev
)
374 put_page(rdev
->sb_page
);
376 rdev
->sb_page
= NULL
;
383 static void super_written(struct bio
*bio
, int error
)
385 mdk_rdev_t
*rdev
= bio
->bi_private
;
386 mddev_t
*mddev
= rdev
->mddev
;
388 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
389 printk("md: super_written gets error=%d, uptodate=%d\n",
390 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
391 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
392 md_error(mddev
, rdev
);
395 if (atomic_dec_and_test(&mddev
->pending_writes
))
396 wake_up(&mddev
->sb_wait
);
400 static void super_written_barrier(struct bio
*bio
, int error
)
402 struct bio
*bio2
= bio
->bi_private
;
403 mdk_rdev_t
*rdev
= bio2
->bi_private
;
404 mddev_t
*mddev
= rdev
->mddev
;
406 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
407 error
== -EOPNOTSUPP
) {
409 /* barriers don't appear to be supported :-( */
410 set_bit(BarriersNotsupp
, &rdev
->flags
);
411 mddev
->barriers_work
= 0;
412 spin_lock_irqsave(&mddev
->write_lock
, flags
);
413 bio2
->bi_next
= mddev
->biolist
;
414 mddev
->biolist
= bio2
;
415 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
416 wake_up(&mddev
->sb_wait
);
420 bio
->bi_private
= rdev
;
421 super_written(bio
, error
);
425 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
426 sector_t sector
, int size
, struct page
*page
)
428 /* write first size bytes of page to sector of rdev
429 * Increment mddev->pending_writes before returning
430 * and decrement it on completion, waking up sb_wait
431 * if zero is reached.
432 * If an error occurred, call md_error
434 * As we might need to resubmit the request if BIO_RW_BARRIER
435 * causes ENOTSUPP, we allocate a spare bio...
437 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
438 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
440 bio
->bi_bdev
= rdev
->bdev
;
441 bio
->bi_sector
= sector
;
442 bio_add_page(bio
, page
, size
, 0);
443 bio
->bi_private
= rdev
;
444 bio
->bi_end_io
= super_written
;
447 atomic_inc(&mddev
->pending_writes
);
448 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
450 rw
|= (1<<BIO_RW_BARRIER
);
451 rbio
= bio_clone(bio
, GFP_NOIO
);
452 rbio
->bi_private
= bio
;
453 rbio
->bi_end_io
= super_written_barrier
;
454 submit_bio(rw
, rbio
);
459 void md_super_wait(mddev_t
*mddev
)
461 /* wait for all superblock writes that were scheduled to complete.
462 * if any had to be retried (due to BARRIER problems), retry them
466 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
467 if (atomic_read(&mddev
->pending_writes
)==0)
469 while (mddev
->biolist
) {
471 spin_lock_irq(&mddev
->write_lock
);
472 bio
= mddev
->biolist
;
473 mddev
->biolist
= bio
->bi_next
;
475 spin_unlock_irq(&mddev
->write_lock
);
476 submit_bio(bio
->bi_rw
, bio
);
480 finish_wait(&mddev
->sb_wait
, &wq
);
483 static void bi_complete(struct bio
*bio
, int error
)
485 complete((struct completion
*)bio
->bi_private
);
488 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
489 struct page
*page
, int rw
)
491 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
492 struct completion event
;
495 rw
|= (1 << BIO_RW_SYNC
);
498 bio
->bi_sector
= sector
;
499 bio_add_page(bio
, page
, size
, 0);
500 init_completion(&event
);
501 bio
->bi_private
= &event
;
502 bio
->bi_end_io
= bi_complete
;
504 wait_for_completion(&event
);
506 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
510 EXPORT_SYMBOL_GPL(sync_page_io
);
512 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
514 char b
[BDEVNAME_SIZE
];
515 if (!rdev
->sb_page
) {
523 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
529 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
530 bdevname(rdev
->bdev
,b
));
534 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
536 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
537 sb1
->set_uuid1
== sb2
->set_uuid1
&&
538 sb1
->set_uuid2
== sb2
->set_uuid2
&&
539 sb1
->set_uuid3
== sb2
->set_uuid3
;
542 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
545 mdp_super_t
*tmp1
, *tmp2
;
547 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
548 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
550 if (!tmp1
|| !tmp2
) {
552 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
560 * nr_disks is not constant
565 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
573 static u32
md_csum_fold(u32 csum
)
575 csum
= (csum
& 0xffff) + (csum
>> 16);
576 return (csum
& 0xffff) + (csum
>> 16);
579 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
582 u32
*sb32
= (u32
*)sb
;
584 unsigned int disk_csum
, csum
;
586 disk_csum
= sb
->sb_csum
;
589 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
591 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
595 /* This used to use csum_partial, which was wrong for several
596 * reasons including that different results are returned on
597 * different architectures. It isn't critical that we get exactly
598 * the same return value as before (we always csum_fold before
599 * testing, and that removes any differences). However as we
600 * know that csum_partial always returned a 16bit value on
601 * alphas, do a fold to maximise conformity to previous behaviour.
603 sb
->sb_csum
= md_csum_fold(disk_csum
);
605 sb
->sb_csum
= disk_csum
;
612 * Handle superblock details.
613 * We want to be able to handle multiple superblock formats
614 * so we have a common interface to them all, and an array of
615 * different handlers.
616 * We rely on user-space to write the initial superblock, and support
617 * reading and updating of superblocks.
618 * Interface methods are:
619 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
620 * loads and validates a superblock on dev.
621 * if refdev != NULL, compare superblocks on both devices
623 * 0 - dev has a superblock that is compatible with refdev
624 * 1 - dev has a superblock that is compatible and newer than refdev
625 * so dev should be used as the refdev in future
626 * -EINVAL superblock incompatible or invalid
627 * -othererror e.g. -EIO
629 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
630 * Verify that dev is acceptable into mddev.
631 * The first time, mddev->raid_disks will be 0, and data from
632 * dev should be merged in. Subsequent calls check that dev
633 * is new enough. Return 0 or -EINVAL
635 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
636 * Update the superblock for rdev with data in mddev
637 * This does not write to disc.
643 struct module
*owner
;
644 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
646 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
647 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
648 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
649 sector_t num_sectors
);
653 * load_super for 0.90.0
655 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
657 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
662 * Calculate the position of the superblock (512byte sectors),
663 * it's at the end of the disk.
665 * It also happens to be a multiple of 4Kb.
667 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
669 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
674 bdevname(rdev
->bdev
, b
);
675 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
677 if (sb
->md_magic
!= MD_SB_MAGIC
) {
678 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
683 if (sb
->major_version
!= 0 ||
684 sb
->minor_version
< 90 ||
685 sb
->minor_version
> 91) {
686 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
687 sb
->major_version
, sb
->minor_version
,
692 if (sb
->raid_disks
<= 0)
695 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
696 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
701 rdev
->preferred_minor
= sb
->md_minor
;
702 rdev
->data_offset
= 0;
703 rdev
->sb_size
= MD_SB_BYTES
;
705 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
706 if (sb
->level
!= 1 && sb
->level
!= 4
707 && sb
->level
!= 5 && sb
->level
!= 6
708 && sb
->level
!= 10) {
709 /* FIXME use a better test */
711 "md: bitmaps not supported for this level.\n");
716 if (sb
->level
== LEVEL_MULTIPATH
)
719 rdev
->desc_nr
= sb
->this_disk
.number
;
725 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
726 if (!uuid_equal(refsb
, sb
)) {
727 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
728 b
, bdevname(refdev
->bdev
,b2
));
731 if (!sb_equal(refsb
, sb
)) {
732 printk(KERN_WARNING
"md: %s has same UUID"
733 " but different superblock to %s\n",
734 b
, bdevname(refdev
->bdev
, b2
));
738 ev2
= md_event(refsb
);
744 rdev
->size
= calc_num_sectors(rdev
, sb
->chunk_size
) / 2;
746 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
747 /* "this cannot possibly happen" ... */
755 * validate_super for 0.90.0
757 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
760 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
761 __u64 ev1
= md_event(sb
);
763 rdev
->raid_disk
= -1;
764 clear_bit(Faulty
, &rdev
->flags
);
765 clear_bit(In_sync
, &rdev
->flags
);
766 clear_bit(WriteMostly
, &rdev
->flags
);
767 clear_bit(BarriersNotsupp
, &rdev
->flags
);
769 if (mddev
->raid_disks
== 0) {
770 mddev
->major_version
= 0;
771 mddev
->minor_version
= sb
->minor_version
;
772 mddev
->patch_version
= sb
->patch_version
;
774 mddev
->chunk_size
= sb
->chunk_size
;
775 mddev
->ctime
= sb
->ctime
;
776 mddev
->utime
= sb
->utime
;
777 mddev
->level
= sb
->level
;
778 mddev
->clevel
[0] = 0;
779 mddev
->layout
= sb
->layout
;
780 mddev
->raid_disks
= sb
->raid_disks
;
781 mddev
->size
= sb
->size
;
783 mddev
->bitmap_offset
= 0;
784 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
786 if (mddev
->minor_version
>= 91) {
787 mddev
->reshape_position
= sb
->reshape_position
;
788 mddev
->delta_disks
= sb
->delta_disks
;
789 mddev
->new_level
= sb
->new_level
;
790 mddev
->new_layout
= sb
->new_layout
;
791 mddev
->new_chunk
= sb
->new_chunk
;
793 mddev
->reshape_position
= MaxSector
;
794 mddev
->delta_disks
= 0;
795 mddev
->new_level
= mddev
->level
;
796 mddev
->new_layout
= mddev
->layout
;
797 mddev
->new_chunk
= mddev
->chunk_size
;
800 if (sb
->state
& (1<<MD_SB_CLEAN
))
801 mddev
->recovery_cp
= MaxSector
;
803 if (sb
->events_hi
== sb
->cp_events_hi
&&
804 sb
->events_lo
== sb
->cp_events_lo
) {
805 mddev
->recovery_cp
= sb
->recovery_cp
;
807 mddev
->recovery_cp
= 0;
810 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
811 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
812 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
813 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
815 mddev
->max_disks
= MD_SB_DISKS
;
817 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
818 mddev
->bitmap_file
== NULL
)
819 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
821 } else if (mddev
->pers
== NULL
) {
822 /* Insist on good event counter while assembling */
824 if (ev1
< mddev
->events
)
826 } else if (mddev
->bitmap
) {
827 /* if adding to array with a bitmap, then we can accept an
828 * older device ... but not too old.
830 if (ev1
< mddev
->bitmap
->events_cleared
)
833 if (ev1
< mddev
->events
)
834 /* just a hot-add of a new device, leave raid_disk at -1 */
838 if (mddev
->level
!= LEVEL_MULTIPATH
) {
839 desc
= sb
->disks
+ rdev
->desc_nr
;
841 if (desc
->state
& (1<<MD_DISK_FAULTY
))
842 set_bit(Faulty
, &rdev
->flags
);
843 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
844 desc->raid_disk < mddev->raid_disks */) {
845 set_bit(In_sync
, &rdev
->flags
);
846 rdev
->raid_disk
= desc
->raid_disk
;
848 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
849 set_bit(WriteMostly
, &rdev
->flags
);
850 } else /* MULTIPATH are always insync */
851 set_bit(In_sync
, &rdev
->flags
);
856 * sync_super for 0.90.0
858 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
861 struct list_head
*tmp
;
863 int next_spare
= mddev
->raid_disks
;
866 /* make rdev->sb match mddev data..
869 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
870 * 3/ any empty disks < next_spare become removed
872 * disks[0] gets initialised to REMOVED because
873 * we cannot be sure from other fields if it has
874 * been initialised or not.
877 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
879 rdev
->sb_size
= MD_SB_BYTES
;
881 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
883 memset(sb
, 0, sizeof(*sb
));
885 sb
->md_magic
= MD_SB_MAGIC
;
886 sb
->major_version
= mddev
->major_version
;
887 sb
->patch_version
= mddev
->patch_version
;
888 sb
->gvalid_words
= 0; /* ignored */
889 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
890 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
891 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
892 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
894 sb
->ctime
= mddev
->ctime
;
895 sb
->level
= mddev
->level
;
896 sb
->size
= mddev
->size
;
897 sb
->raid_disks
= mddev
->raid_disks
;
898 sb
->md_minor
= mddev
->md_minor
;
899 sb
->not_persistent
= 0;
900 sb
->utime
= mddev
->utime
;
902 sb
->events_hi
= (mddev
->events
>>32);
903 sb
->events_lo
= (u32
)mddev
->events
;
905 if (mddev
->reshape_position
== MaxSector
)
906 sb
->minor_version
= 90;
908 sb
->minor_version
= 91;
909 sb
->reshape_position
= mddev
->reshape_position
;
910 sb
->new_level
= mddev
->new_level
;
911 sb
->delta_disks
= mddev
->delta_disks
;
912 sb
->new_layout
= mddev
->new_layout
;
913 sb
->new_chunk
= mddev
->new_chunk
;
915 mddev
->minor_version
= sb
->minor_version
;
918 sb
->recovery_cp
= mddev
->recovery_cp
;
919 sb
->cp_events_hi
= (mddev
->events
>>32);
920 sb
->cp_events_lo
= (u32
)mddev
->events
;
921 if (mddev
->recovery_cp
== MaxSector
)
922 sb
->state
= (1<< MD_SB_CLEAN
);
926 sb
->layout
= mddev
->layout
;
927 sb
->chunk_size
= mddev
->chunk_size
;
929 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
930 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
932 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
933 rdev_for_each(rdev2
, tmp
, mddev
) {
936 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
937 && !test_bit(Faulty
, &rdev2
->flags
))
938 desc_nr
= rdev2
->raid_disk
;
940 desc_nr
= next_spare
++;
941 rdev2
->desc_nr
= desc_nr
;
942 d
= &sb
->disks
[rdev2
->desc_nr
];
944 d
->number
= rdev2
->desc_nr
;
945 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
946 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
947 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
948 && !test_bit(Faulty
, &rdev2
->flags
))
949 d
->raid_disk
= rdev2
->raid_disk
;
951 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
952 if (test_bit(Faulty
, &rdev2
->flags
))
953 d
->state
= (1<<MD_DISK_FAULTY
);
954 else if (test_bit(In_sync
, &rdev2
->flags
)) {
955 d
->state
= (1<<MD_DISK_ACTIVE
);
956 d
->state
|= (1<<MD_DISK_SYNC
);
964 if (test_bit(WriteMostly
, &rdev2
->flags
))
965 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
967 /* now set the "removed" and "faulty" bits on any missing devices */
968 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
969 mdp_disk_t
*d
= &sb
->disks
[i
];
970 if (d
->state
== 0 && d
->number
== 0) {
973 d
->state
= (1<<MD_DISK_REMOVED
);
974 d
->state
|= (1<<MD_DISK_FAULTY
);
978 sb
->nr_disks
= nr_disks
;
979 sb
->active_disks
= active
;
980 sb
->working_disks
= working
;
981 sb
->failed_disks
= failed
;
982 sb
->spare_disks
= spare
;
984 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
985 sb
->sb_csum
= calc_sb_csum(sb
);
989 * rdev_size_change for 0.90.0
991 static unsigned long long
992 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
994 if (num_sectors
&& num_sectors
< rdev
->mddev
->size
* 2)
995 return 0; /* component must fit device */
996 if (rdev
->mddev
->bitmap_offset
)
997 return 0; /* can't move bitmap */
998 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
999 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1000 num_sectors
= rdev
->sb_start
;
1001 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1003 md_super_wait(rdev
->mddev
);
1004 return num_sectors
/ 2; /* kB for sysfs */
1009 * version 1 superblock
1012 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1016 unsigned long long newcsum
;
1017 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1018 __le32
*isuper
= (__le32
*)sb
;
1021 disk_csum
= sb
->sb_csum
;
1024 for (i
=0; size
>=4; size
-= 4 )
1025 newcsum
+= le32_to_cpu(*isuper
++);
1028 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1030 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1031 sb
->sb_csum
= disk_csum
;
1032 return cpu_to_le32(csum
);
1035 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1037 struct mdp_superblock_1
*sb
;
1040 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1044 * Calculate the position of the superblock in 512byte sectors.
1045 * It is always aligned to a 4K boundary and
1046 * depeding on minor_version, it can be:
1047 * 0: At least 8K, but less than 12K, from end of device
1048 * 1: At start of device
1049 * 2: 4K from start of device.
1051 switch(minor_version
) {
1053 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1055 sb_start
&= ~(sector_t
)(4*2-1);
1066 rdev
->sb_start
= sb_start
;
1068 /* superblock is rarely larger than 1K, but it can be larger,
1069 * and it is safe to read 4k, so we do that
1071 ret
= read_disk_sb(rdev
, 4096);
1072 if (ret
) return ret
;
1075 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1077 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1078 sb
->major_version
!= cpu_to_le32(1) ||
1079 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1080 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1081 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1084 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1085 printk("md: invalid superblock checksum on %s\n",
1086 bdevname(rdev
->bdev
,b
));
1089 if (le64_to_cpu(sb
->data_size
) < 10) {
1090 printk("md: data_size too small on %s\n",
1091 bdevname(rdev
->bdev
,b
));
1094 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1095 if (sb
->level
!= cpu_to_le32(1) &&
1096 sb
->level
!= cpu_to_le32(4) &&
1097 sb
->level
!= cpu_to_le32(5) &&
1098 sb
->level
!= cpu_to_le32(6) &&
1099 sb
->level
!= cpu_to_le32(10)) {
1101 "md: bitmaps not supported for this level.\n");
1106 rdev
->preferred_minor
= 0xffff;
1107 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1108 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1110 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1111 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1112 if (rdev
->sb_size
& bmask
)
1113 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1116 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1119 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1122 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1128 struct mdp_superblock_1
*refsb
=
1129 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1131 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1132 sb
->level
!= refsb
->level
||
1133 sb
->layout
!= refsb
->layout
||
1134 sb
->chunksize
!= refsb
->chunksize
) {
1135 printk(KERN_WARNING
"md: %s has strangely different"
1136 " superblock to %s\n",
1137 bdevname(rdev
->bdev
,b
),
1138 bdevname(refdev
->bdev
,b2
));
1141 ev1
= le64_to_cpu(sb
->events
);
1142 ev2
= le64_to_cpu(refsb
->events
);
1150 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1152 rdev
->size
= rdev
->sb_start
/ 2;
1153 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1155 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1156 if (le32_to_cpu(sb
->chunksize
))
1157 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1159 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1164 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1166 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1167 __u64 ev1
= le64_to_cpu(sb
->events
);
1169 rdev
->raid_disk
= -1;
1170 clear_bit(Faulty
, &rdev
->flags
);
1171 clear_bit(In_sync
, &rdev
->flags
);
1172 clear_bit(WriteMostly
, &rdev
->flags
);
1173 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1175 if (mddev
->raid_disks
== 0) {
1176 mddev
->major_version
= 1;
1177 mddev
->patch_version
= 0;
1178 mddev
->external
= 0;
1179 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1180 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1181 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1182 mddev
->level
= le32_to_cpu(sb
->level
);
1183 mddev
->clevel
[0] = 0;
1184 mddev
->layout
= le32_to_cpu(sb
->layout
);
1185 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1186 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1187 mddev
->events
= ev1
;
1188 mddev
->bitmap_offset
= 0;
1189 mddev
->default_bitmap_offset
= 1024 >> 9;
1191 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1192 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1194 mddev
->max_disks
= (4096-256)/2;
1196 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1197 mddev
->bitmap_file
== NULL
)
1198 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1200 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1201 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1202 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1203 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1204 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1205 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1207 mddev
->reshape_position
= MaxSector
;
1208 mddev
->delta_disks
= 0;
1209 mddev
->new_level
= mddev
->level
;
1210 mddev
->new_layout
= mddev
->layout
;
1211 mddev
->new_chunk
= mddev
->chunk_size
;
1214 } else if (mddev
->pers
== NULL
) {
1215 /* Insist of good event counter while assembling */
1217 if (ev1
< mddev
->events
)
1219 } else if (mddev
->bitmap
) {
1220 /* If adding to array with a bitmap, then we can accept an
1221 * older device, but not too old.
1223 if (ev1
< mddev
->bitmap
->events_cleared
)
1226 if (ev1
< mddev
->events
)
1227 /* just a hot-add of a new device, leave raid_disk at -1 */
1230 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1232 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1234 case 0xffff: /* spare */
1236 case 0xfffe: /* faulty */
1237 set_bit(Faulty
, &rdev
->flags
);
1240 if ((le32_to_cpu(sb
->feature_map
) &
1241 MD_FEATURE_RECOVERY_OFFSET
))
1242 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1244 set_bit(In_sync
, &rdev
->flags
);
1245 rdev
->raid_disk
= role
;
1248 if (sb
->devflags
& WriteMostly1
)
1249 set_bit(WriteMostly
, &rdev
->flags
);
1250 } else /* MULTIPATH are always insync */
1251 set_bit(In_sync
, &rdev
->flags
);
1256 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1258 struct mdp_superblock_1
*sb
;
1259 struct list_head
*tmp
;
1262 /* make rdev->sb match mddev and rdev data. */
1264 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1266 sb
->feature_map
= 0;
1268 sb
->recovery_offset
= cpu_to_le64(0);
1269 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1270 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1271 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1273 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1274 sb
->events
= cpu_to_le64(mddev
->events
);
1276 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1278 sb
->resync_offset
= cpu_to_le64(0);
1280 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1282 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1283 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1285 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1286 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1287 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1290 if (rdev
->raid_disk
>= 0 &&
1291 !test_bit(In_sync
, &rdev
->flags
) &&
1292 rdev
->recovery_offset
> 0) {
1293 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1294 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1297 if (mddev
->reshape_position
!= MaxSector
) {
1298 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1299 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1300 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1301 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1302 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1303 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1307 rdev_for_each(rdev2
, tmp
, mddev
)
1308 if (rdev2
->desc_nr
+1 > max_dev
)
1309 max_dev
= rdev2
->desc_nr
+1;
1311 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1312 sb
->max_dev
= cpu_to_le32(max_dev
);
1313 for (i
=0; i
<max_dev
;i
++)
1314 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1316 rdev_for_each(rdev2
, tmp
, mddev
) {
1318 if (test_bit(Faulty
, &rdev2
->flags
))
1319 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1320 else if (test_bit(In_sync
, &rdev2
->flags
))
1321 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1322 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1323 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1325 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1328 sb
->sb_csum
= calc_sb_1_csum(sb
);
1331 static unsigned long long
1332 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1334 struct mdp_superblock_1
*sb
;
1335 sector_t max_sectors
;
1336 if (num_sectors
&& num_sectors
< rdev
->mddev
->size
* 2)
1337 return 0; /* component must fit device */
1338 if (rdev
->sb_start
< rdev
->data_offset
) {
1339 /* minor versions 1 and 2; superblock before data */
1340 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1341 max_sectors
-= rdev
->data_offset
;
1342 if (!num_sectors
|| num_sectors
> max_sectors
)
1343 num_sectors
= max_sectors
;
1344 } else if (rdev
->mddev
->bitmap_offset
) {
1345 /* minor version 0 with bitmap we can't move */
1348 /* minor version 0; superblock after data */
1350 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1351 sb_start
&= ~(sector_t
)(4*2 - 1);
1352 max_sectors
= rdev
->size
* 2 + sb_start
- rdev
->sb_start
;
1353 if (!num_sectors
|| num_sectors
> max_sectors
)
1354 num_sectors
= max_sectors
;
1355 rdev
->sb_start
= sb_start
;
1357 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1358 sb
->data_size
= cpu_to_le64(num_sectors
);
1359 sb
->super_offset
= rdev
->sb_start
;
1360 sb
->sb_csum
= calc_sb_1_csum(sb
);
1361 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1363 md_super_wait(rdev
->mddev
);
1364 return num_sectors
/ 2; /* kB for sysfs */
1367 static struct super_type super_types
[] = {
1370 .owner
= THIS_MODULE
,
1371 .load_super
= super_90_load
,
1372 .validate_super
= super_90_validate
,
1373 .sync_super
= super_90_sync
,
1374 .rdev_size_change
= super_90_rdev_size_change
,
1378 .owner
= THIS_MODULE
,
1379 .load_super
= super_1_load
,
1380 .validate_super
= super_1_validate
,
1381 .sync_super
= super_1_sync
,
1382 .rdev_size_change
= super_1_rdev_size_change
,
1386 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1388 mdk_rdev_t
*rdev
, *rdev2
;
1391 rdev_for_each_rcu(rdev
, mddev1
)
1392 rdev_for_each_rcu(rdev2
, mddev2
)
1393 if (rdev
->bdev
->bd_contains
==
1394 rdev2
->bdev
->bd_contains
) {
1402 static LIST_HEAD(pending_raid_disks
);
1404 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1406 char b
[BDEVNAME_SIZE
];
1416 /* prevent duplicates */
1417 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1420 /* make sure rdev->size exceeds mddev->size */
1421 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1423 /* Cannot change size, so fail
1424 * If mddev->level <= 0, then we don't care
1425 * about aligning sizes (e.g. linear)
1427 if (mddev
->level
> 0)
1430 mddev
->size
= rdev
->size
;
1433 /* Verify rdev->desc_nr is unique.
1434 * If it is -1, assign a free number, else
1435 * check number is not in use
1437 if (rdev
->desc_nr
< 0) {
1439 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1440 while (find_rdev_nr(mddev
, choice
))
1442 rdev
->desc_nr
= choice
;
1444 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1447 bdevname(rdev
->bdev
,b
);
1448 while ( (s
=strchr(b
, '/')) != NULL
)
1451 rdev
->mddev
= mddev
;
1452 printk(KERN_INFO
"md: bind<%s>\n", b
);
1454 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1457 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1458 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1459 kobject_del(&rdev
->kobj
);
1462 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1463 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1467 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1472 static void md_delayed_delete(struct work_struct
*ws
)
1474 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1475 kobject_del(&rdev
->kobj
);
1476 kobject_put(&rdev
->kobj
);
1479 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1481 char b
[BDEVNAME_SIZE
];
1486 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1487 list_del_rcu(&rdev
->same_set
);
1488 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1490 sysfs_remove_link(&rdev
->kobj
, "block");
1492 /* We need to delay this, otherwise we can deadlock when
1493 * writing to 'remove' to "dev/state". We also need
1494 * to delay it due to rcu usage.
1497 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1498 kobject_get(&rdev
->kobj
);
1499 schedule_work(&rdev
->del_work
);
1503 * prevent the device from being mounted, repartitioned or
1504 * otherwise reused by a RAID array (or any other kernel
1505 * subsystem), by bd_claiming the device.
1507 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1510 struct block_device
*bdev
;
1511 char b
[BDEVNAME_SIZE
];
1513 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1515 printk(KERN_ERR
"md: could not open %s.\n",
1516 __bdevname(dev
, b
));
1517 return PTR_ERR(bdev
);
1519 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1521 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1523 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1527 set_bit(AllReserved
, &rdev
->flags
);
1532 static void unlock_rdev(mdk_rdev_t
*rdev
)
1534 struct block_device
*bdev
= rdev
->bdev
;
1539 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1542 void md_autodetect_dev(dev_t dev
);
1544 static void export_rdev(mdk_rdev_t
* rdev
)
1546 char b
[BDEVNAME_SIZE
];
1547 printk(KERN_INFO
"md: export_rdev(%s)\n",
1548 bdevname(rdev
->bdev
,b
));
1553 if (test_bit(AutoDetected
, &rdev
->flags
))
1554 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1557 kobject_put(&rdev
->kobj
);
1560 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1562 unbind_rdev_from_array(rdev
);
1566 static void export_array(mddev_t
*mddev
)
1568 struct list_head
*tmp
;
1571 rdev_for_each(rdev
, tmp
, mddev
) {
1576 kick_rdev_from_array(rdev
);
1578 if (!list_empty(&mddev
->disks
))
1580 mddev
->raid_disks
= 0;
1581 mddev
->major_version
= 0;
1584 static void print_desc(mdp_disk_t
*desc
)
1586 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1587 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1590 static void print_sb(mdp_super_t
*sb
)
1595 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1596 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1597 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1599 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1600 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1601 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1602 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1603 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1604 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1605 sb
->failed_disks
, sb
->spare_disks
,
1606 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1609 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1612 desc
= sb
->disks
+ i
;
1613 if (desc
->number
|| desc
->major
|| desc
->minor
||
1614 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1615 printk(" D %2d: ", i
);
1619 printk(KERN_INFO
"md: THIS: ");
1620 print_desc(&sb
->this_disk
);
1624 static void print_rdev(mdk_rdev_t
*rdev
)
1626 char b
[BDEVNAME_SIZE
];
1627 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1628 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1629 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1631 if (rdev
->sb_loaded
) {
1632 printk(KERN_INFO
"md: rdev superblock:\n");
1633 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1635 printk(KERN_INFO
"md: no rdev superblock!\n");
1638 static void md_print_devices(void)
1640 struct list_head
*tmp
, *tmp2
;
1643 char b
[BDEVNAME_SIZE
];
1646 printk("md: **********************************\n");
1647 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1648 printk("md: **********************************\n");
1649 for_each_mddev(mddev
, tmp
) {
1652 bitmap_print_sb(mddev
->bitmap
);
1654 printk("%s: ", mdname(mddev
));
1655 rdev_for_each(rdev
, tmp2
, mddev
)
1656 printk("<%s>", bdevname(rdev
->bdev
,b
));
1659 rdev_for_each(rdev
, tmp2
, mddev
)
1662 printk("md: **********************************\n");
1667 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1669 /* Update each superblock (in-memory image), but
1670 * if we are allowed to, skip spares which already
1671 * have the right event counter, or have one earlier
1672 * (which would mean they aren't being marked as dirty
1673 * with the rest of the array)
1676 struct list_head
*tmp
;
1678 rdev_for_each(rdev
, tmp
, mddev
) {
1679 if (rdev
->sb_events
== mddev
->events
||
1681 rdev
->raid_disk
< 0 &&
1682 (rdev
->sb_events
&1)==0 &&
1683 rdev
->sb_events
+1 == mddev
->events
)) {
1684 /* Don't update this superblock */
1685 rdev
->sb_loaded
= 2;
1687 super_types
[mddev
->major_version
].
1688 sync_super(mddev
, rdev
);
1689 rdev
->sb_loaded
= 1;
1694 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1696 struct list_head
*tmp
;
1701 if (mddev
->external
)
1704 spin_lock_irq(&mddev
->write_lock
);
1706 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1707 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1709 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1710 /* just a clean<-> dirty transition, possibly leave spares alone,
1711 * though if events isn't the right even/odd, we will have to do
1717 if (mddev
->degraded
)
1718 /* If the array is degraded, then skipping spares is both
1719 * dangerous and fairly pointless.
1720 * Dangerous because a device that was removed from the array
1721 * might have a event_count that still looks up-to-date,
1722 * so it can be re-added without a resync.
1723 * Pointless because if there are any spares to skip,
1724 * then a recovery will happen and soon that array won't
1725 * be degraded any more and the spare can go back to sleep then.
1729 sync_req
= mddev
->in_sync
;
1730 mddev
->utime
= get_seconds();
1732 /* If this is just a dirty<->clean transition, and the array is clean
1733 * and 'events' is odd, we can roll back to the previous clean state */
1735 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1736 && (mddev
->events
& 1)
1737 && mddev
->events
!= 1)
1740 /* otherwise we have to go forward and ... */
1742 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1743 /* .. if the array isn't clean, insist on an odd 'events' */
1744 if ((mddev
->events
&1)==0) {
1749 /* otherwise insist on an even 'events' (for clean states) */
1750 if ((mddev
->events
&1)) {
1757 if (!mddev
->events
) {
1759 * oops, this 64-bit counter should never wrap.
1760 * Either we are in around ~1 trillion A.C., assuming
1761 * 1 reboot per second, or we have a bug:
1768 * do not write anything to disk if using
1769 * nonpersistent superblocks
1771 if (!mddev
->persistent
) {
1772 if (!mddev
->external
)
1773 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1775 spin_unlock_irq(&mddev
->write_lock
);
1776 wake_up(&mddev
->sb_wait
);
1779 sync_sbs(mddev
, nospares
);
1780 spin_unlock_irq(&mddev
->write_lock
);
1783 "md: updating %s RAID superblock on device (in sync %d)\n",
1784 mdname(mddev
),mddev
->in_sync
);
1786 bitmap_update_sb(mddev
->bitmap
);
1787 rdev_for_each(rdev
, tmp
, mddev
) {
1788 char b
[BDEVNAME_SIZE
];
1789 dprintk(KERN_INFO
"md: ");
1790 if (rdev
->sb_loaded
!= 1)
1791 continue; /* no noise on spare devices */
1792 if (test_bit(Faulty
, &rdev
->flags
))
1793 dprintk("(skipping faulty ");
1795 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1796 if (!test_bit(Faulty
, &rdev
->flags
)) {
1797 md_super_write(mddev
,rdev
,
1798 rdev
->sb_start
, rdev
->sb_size
,
1800 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1801 bdevname(rdev
->bdev
,b
),
1802 (unsigned long long)rdev
->sb_start
);
1803 rdev
->sb_events
= mddev
->events
;
1807 if (mddev
->level
== LEVEL_MULTIPATH
)
1808 /* only need to write one superblock... */
1811 md_super_wait(mddev
);
1812 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1814 spin_lock_irq(&mddev
->write_lock
);
1815 if (mddev
->in_sync
!= sync_req
||
1816 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1817 /* have to write it out again */
1818 spin_unlock_irq(&mddev
->write_lock
);
1821 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1822 spin_unlock_irq(&mddev
->write_lock
);
1823 wake_up(&mddev
->sb_wait
);
1827 /* words written to sysfs files may, or may not, be \n terminated.
1828 * We want to accept with case. For this we use cmd_match.
1830 static int cmd_match(const char *cmd
, const char *str
)
1832 /* See if cmd, written into a sysfs file, matches
1833 * str. They must either be the same, or cmd can
1834 * have a trailing newline
1836 while (*cmd
&& *str
&& *cmd
== *str
) {
1847 struct rdev_sysfs_entry
{
1848 struct attribute attr
;
1849 ssize_t (*show
)(mdk_rdev_t
*, char *);
1850 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1854 state_show(mdk_rdev_t
*rdev
, char *page
)
1859 if (test_bit(Faulty
, &rdev
->flags
)) {
1860 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1863 if (test_bit(In_sync
, &rdev
->flags
)) {
1864 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1867 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1868 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1871 if (test_bit(Blocked
, &rdev
->flags
)) {
1872 len
+= sprintf(page
+len
, "%sblocked", sep
);
1875 if (!test_bit(Faulty
, &rdev
->flags
) &&
1876 !test_bit(In_sync
, &rdev
->flags
)) {
1877 len
+= sprintf(page
+len
, "%sspare", sep
);
1880 return len
+sprintf(page
+len
, "\n");
1884 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1887 * faulty - simulates and error
1888 * remove - disconnects the device
1889 * writemostly - sets write_mostly
1890 * -writemostly - clears write_mostly
1891 * blocked - sets the Blocked flag
1892 * -blocked - clears the Blocked flag
1895 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1896 md_error(rdev
->mddev
, rdev
);
1898 } else if (cmd_match(buf
, "remove")) {
1899 if (rdev
->raid_disk
>= 0)
1902 mddev_t
*mddev
= rdev
->mddev
;
1903 kick_rdev_from_array(rdev
);
1905 md_update_sb(mddev
, 1);
1906 md_new_event(mddev
);
1909 } else if (cmd_match(buf
, "writemostly")) {
1910 set_bit(WriteMostly
, &rdev
->flags
);
1912 } else if (cmd_match(buf
, "-writemostly")) {
1913 clear_bit(WriteMostly
, &rdev
->flags
);
1915 } else if (cmd_match(buf
, "blocked")) {
1916 set_bit(Blocked
, &rdev
->flags
);
1918 } else if (cmd_match(buf
, "-blocked")) {
1919 clear_bit(Blocked
, &rdev
->flags
);
1920 wake_up(&rdev
->blocked_wait
);
1921 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1922 md_wakeup_thread(rdev
->mddev
->thread
);
1927 sysfs_notify(&rdev
->kobj
, NULL
, "state");
1928 return err
? err
: len
;
1930 static struct rdev_sysfs_entry rdev_state
=
1931 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1934 errors_show(mdk_rdev_t
*rdev
, char *page
)
1936 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1940 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1943 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1944 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1945 atomic_set(&rdev
->corrected_errors
, n
);
1950 static struct rdev_sysfs_entry rdev_errors
=
1951 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1954 slot_show(mdk_rdev_t
*rdev
, char *page
)
1956 if (rdev
->raid_disk
< 0)
1957 return sprintf(page
, "none\n");
1959 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1963 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1968 int slot
= simple_strtoul(buf
, &e
, 10);
1969 if (strncmp(buf
, "none", 4)==0)
1971 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1973 if (rdev
->mddev
->pers
&& slot
== -1) {
1974 /* Setting 'slot' on an active array requires also
1975 * updating the 'rd%d' link, and communicating
1976 * with the personality with ->hot_*_disk.
1977 * For now we only support removing
1978 * failed/spare devices. This normally happens automatically,
1979 * but not when the metadata is externally managed.
1981 if (rdev
->raid_disk
== -1)
1983 /* personality does all needed checks */
1984 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
1986 err
= rdev
->mddev
->pers
->
1987 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
1990 sprintf(nm
, "rd%d", rdev
->raid_disk
);
1991 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
1992 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1993 md_wakeup_thread(rdev
->mddev
->thread
);
1994 } else if (rdev
->mddev
->pers
) {
1996 struct list_head
*tmp
;
1997 /* Activating a spare .. or possibly reactivating
1998 * if we every get bitmaps working here.
2001 if (rdev
->raid_disk
!= -1)
2004 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2007 rdev_for_each(rdev2
, tmp
, rdev
->mddev
)
2008 if (rdev2
->raid_disk
== slot
)
2011 rdev
->raid_disk
= slot
;
2012 if (test_bit(In_sync
, &rdev
->flags
))
2013 rdev
->saved_raid_disk
= slot
;
2015 rdev
->saved_raid_disk
= -1;
2016 err
= rdev
->mddev
->pers
->
2017 hot_add_disk(rdev
->mddev
, rdev
);
2019 rdev
->raid_disk
= -1;
2022 sysfs_notify(&rdev
->kobj
, NULL
, "state");
2023 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2024 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2026 "md: cannot register "
2028 nm
, mdname(rdev
->mddev
));
2030 /* don't wakeup anyone, leave that to userspace. */
2032 if (slot
>= rdev
->mddev
->raid_disks
)
2034 rdev
->raid_disk
= slot
;
2035 /* assume it is working */
2036 clear_bit(Faulty
, &rdev
->flags
);
2037 clear_bit(WriteMostly
, &rdev
->flags
);
2038 set_bit(In_sync
, &rdev
->flags
);
2039 sysfs_notify(&rdev
->kobj
, NULL
, "state");
2045 static struct rdev_sysfs_entry rdev_slot
=
2046 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2049 offset_show(mdk_rdev_t
*rdev
, char *page
)
2051 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2055 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2058 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2059 if (e
==buf
|| (*e
&& *e
!= '\n'))
2061 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2063 if (rdev
->size
&& rdev
->mddev
->external
)
2064 /* Must set offset before size, so overlap checks
2067 rdev
->data_offset
= offset
;
2071 static struct rdev_sysfs_entry rdev_offset
=
2072 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2075 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2077 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
2080 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2082 /* check if two start/length pairs overlap */
2091 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2093 unsigned long long size
;
2094 unsigned long long oldsize
= rdev
->size
;
2095 mddev_t
*my_mddev
= rdev
->mddev
;
2097 if (strict_strtoull(buf
, 10, &size
) < 0)
2099 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2100 if (my_mddev
->persistent
) {
2101 size
= super_types
[my_mddev
->major_version
].
2102 rdev_size_change(rdev
, size
* 2);
2106 size
= (rdev
->bdev
->bd_inode
->i_size
>> 10);
2107 size
-= rdev
->data_offset
/2;
2110 if (size
< my_mddev
->size
)
2111 return -EINVAL
; /* component must fit device */
2114 if (size
> oldsize
&& my_mddev
->external
) {
2115 /* need to check that all other rdevs with the same ->bdev
2116 * do not overlap. We need to unlock the mddev to avoid
2117 * a deadlock. We have already changed rdev->size, and if
2118 * we have to change it back, we will have the lock again.
2122 struct list_head
*tmp
, *tmp2
;
2124 mddev_unlock(my_mddev
);
2125 for_each_mddev(mddev
, tmp
) {
2129 rdev_for_each(rdev2
, tmp2
, mddev
)
2130 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2131 (rdev
->bdev
== rdev2
->bdev
&&
2133 overlaps(rdev
->data_offset
, rdev
->size
* 2,
2135 rdev2
->size
* 2))) {
2139 mddev_unlock(mddev
);
2145 mddev_lock(my_mddev
);
2147 /* Someone else could have slipped in a size
2148 * change here, but doing so is just silly.
2149 * We put oldsize back because we *know* it is
2150 * safe, and trust userspace not to race with
2153 rdev
->size
= oldsize
;
2160 static struct rdev_sysfs_entry rdev_size
=
2161 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2163 static struct attribute
*rdev_default_attrs
[] = {
2172 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2174 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2175 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2176 mddev_t
*mddev
= rdev
->mddev
;
2182 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2184 if (rdev
->mddev
== NULL
)
2187 rv
= entry
->show(rdev
, page
);
2188 mddev_unlock(mddev
);
2194 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2195 const char *page
, size_t length
)
2197 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2198 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2200 mddev_t
*mddev
= rdev
->mddev
;
2204 if (!capable(CAP_SYS_ADMIN
))
2206 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2208 if (rdev
->mddev
== NULL
)
2211 rv
= entry
->store(rdev
, page
, length
);
2212 mddev_unlock(mddev
);
2217 static void rdev_free(struct kobject
*ko
)
2219 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2222 static struct sysfs_ops rdev_sysfs_ops
= {
2223 .show
= rdev_attr_show
,
2224 .store
= rdev_attr_store
,
2226 static struct kobj_type rdev_ktype
= {
2227 .release
= rdev_free
,
2228 .sysfs_ops
= &rdev_sysfs_ops
,
2229 .default_attrs
= rdev_default_attrs
,
2233 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2235 * mark the device faulty if:
2237 * - the device is nonexistent (zero size)
2238 * - the device has no valid superblock
2240 * a faulty rdev _never_ has rdev->sb set.
2242 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2244 char b
[BDEVNAME_SIZE
];
2249 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2251 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2252 return ERR_PTR(-ENOMEM
);
2255 if ((err
= alloc_disk_sb(rdev
)))
2258 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2262 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2265 rdev
->saved_raid_disk
= -1;
2266 rdev
->raid_disk
= -1;
2268 rdev
->data_offset
= 0;
2269 rdev
->sb_events
= 0;
2270 atomic_set(&rdev
->nr_pending
, 0);
2271 atomic_set(&rdev
->read_errors
, 0);
2272 atomic_set(&rdev
->corrected_errors
, 0);
2274 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2277 "md: %s has zero or unknown size, marking faulty!\n",
2278 bdevname(rdev
->bdev
,b
));
2283 if (super_format
>= 0) {
2284 err
= super_types
[super_format
].
2285 load_super(rdev
, NULL
, super_minor
);
2286 if (err
== -EINVAL
) {
2288 "md: %s does not have a valid v%d.%d "
2289 "superblock, not importing!\n",
2290 bdevname(rdev
->bdev
,b
),
2291 super_format
, super_minor
);
2296 "md: could not read %s's sb, not importing!\n",
2297 bdevname(rdev
->bdev
,b
));
2302 INIT_LIST_HEAD(&rdev
->same_set
);
2303 init_waitqueue_head(&rdev
->blocked_wait
);
2308 if (rdev
->sb_page
) {
2314 return ERR_PTR(err
);
2318 * Check a full RAID array for plausibility
2322 static void analyze_sbs(mddev_t
* mddev
)
2325 struct list_head
*tmp
;
2326 mdk_rdev_t
*rdev
, *freshest
;
2327 char b
[BDEVNAME_SIZE
];
2330 rdev_for_each(rdev
, tmp
, mddev
)
2331 switch (super_types
[mddev
->major_version
].
2332 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2340 "md: fatal superblock inconsistency in %s"
2341 " -- removing from array\n",
2342 bdevname(rdev
->bdev
,b
));
2343 kick_rdev_from_array(rdev
);
2347 super_types
[mddev
->major_version
].
2348 validate_super(mddev
, freshest
);
2351 rdev_for_each(rdev
, tmp
, mddev
) {
2352 if (rdev
!= freshest
)
2353 if (super_types
[mddev
->major_version
].
2354 validate_super(mddev
, rdev
)) {
2355 printk(KERN_WARNING
"md: kicking non-fresh %s"
2357 bdevname(rdev
->bdev
,b
));
2358 kick_rdev_from_array(rdev
);
2361 if (mddev
->level
== LEVEL_MULTIPATH
) {
2362 rdev
->desc_nr
= i
++;
2363 rdev
->raid_disk
= rdev
->desc_nr
;
2364 set_bit(In_sync
, &rdev
->flags
);
2365 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2366 rdev
->raid_disk
= -1;
2367 clear_bit(In_sync
, &rdev
->flags
);
2373 if (mddev
->recovery_cp
!= MaxSector
&&
2375 printk(KERN_ERR
"md: %s: raid array is not clean"
2376 " -- starting background reconstruction\n",
2381 static void md_safemode_timeout(unsigned long data
);
2384 safe_delay_show(mddev_t
*mddev
, char *page
)
2386 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2387 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2390 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2398 /* remove a period, and count digits after it */
2399 if (len
>= sizeof(buf
))
2401 strlcpy(buf
, cbuf
, sizeof(buf
));
2402 for (i
=0; i
<len
; i
++) {
2404 if (isdigit(buf
[i
])) {
2409 } else if (buf
[i
] == '.') {
2414 if (strict_strtoul(buf
, 10, &msec
) < 0)
2416 msec
= (msec
* 1000) / scale
;
2418 mddev
->safemode_delay
= 0;
2420 unsigned long old_delay
= mddev
->safemode_delay
;
2421 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2422 if (mddev
->safemode_delay
== 0)
2423 mddev
->safemode_delay
= 1;
2424 if (mddev
->safemode_delay
< old_delay
)
2425 md_safemode_timeout((unsigned long)mddev
);
2429 static struct md_sysfs_entry md_safe_delay
=
2430 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2433 level_show(mddev_t
*mddev
, char *page
)
2435 struct mdk_personality
*p
= mddev
->pers
;
2437 return sprintf(page
, "%s\n", p
->name
);
2438 else if (mddev
->clevel
[0])
2439 return sprintf(page
, "%s\n", mddev
->clevel
);
2440 else if (mddev
->level
!= LEVEL_NONE
)
2441 return sprintf(page
, "%d\n", mddev
->level
);
2447 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2454 if (len
>= sizeof(mddev
->clevel
))
2456 strncpy(mddev
->clevel
, buf
, len
);
2457 if (mddev
->clevel
[len
-1] == '\n')
2459 mddev
->clevel
[len
] = 0;
2460 mddev
->level
= LEVEL_NONE
;
2464 static struct md_sysfs_entry md_level
=
2465 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2469 layout_show(mddev_t
*mddev
, char *page
)
2471 /* just a number, not meaningful for all levels */
2472 if (mddev
->reshape_position
!= MaxSector
&&
2473 mddev
->layout
!= mddev
->new_layout
)
2474 return sprintf(page
, "%d (%d)\n",
2475 mddev
->new_layout
, mddev
->layout
);
2476 return sprintf(page
, "%d\n", mddev
->layout
);
2480 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2483 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2485 if (!*buf
|| (*e
&& *e
!= '\n'))
2490 if (mddev
->reshape_position
!= MaxSector
)
2491 mddev
->new_layout
= n
;
2496 static struct md_sysfs_entry md_layout
=
2497 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2501 raid_disks_show(mddev_t
*mddev
, char *page
)
2503 if (mddev
->raid_disks
== 0)
2505 if (mddev
->reshape_position
!= MaxSector
&&
2506 mddev
->delta_disks
!= 0)
2507 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2508 mddev
->raid_disks
- mddev
->delta_disks
);
2509 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2512 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2515 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2519 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2521 if (!*buf
|| (*e
&& *e
!= '\n'))
2525 rv
= update_raid_disks(mddev
, n
);
2526 else if (mddev
->reshape_position
!= MaxSector
) {
2527 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2528 mddev
->delta_disks
= n
- olddisks
;
2529 mddev
->raid_disks
= n
;
2531 mddev
->raid_disks
= n
;
2532 return rv
? rv
: len
;
2534 static struct md_sysfs_entry md_raid_disks
=
2535 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2538 chunk_size_show(mddev_t
*mddev
, char *page
)
2540 if (mddev
->reshape_position
!= MaxSector
&&
2541 mddev
->chunk_size
!= mddev
->new_chunk
)
2542 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2544 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2548 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2550 /* can only set chunk_size if array is not yet active */
2552 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2554 if (!*buf
|| (*e
&& *e
!= '\n'))
2559 else if (mddev
->reshape_position
!= MaxSector
)
2560 mddev
->new_chunk
= n
;
2562 mddev
->chunk_size
= n
;
2565 static struct md_sysfs_entry md_chunk_size
=
2566 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2569 resync_start_show(mddev_t
*mddev
, char *page
)
2571 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2575 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2578 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2582 if (!*buf
|| (*e
&& *e
!= '\n'))
2585 mddev
->recovery_cp
= n
;
2588 static struct md_sysfs_entry md_resync_start
=
2589 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2592 * The array state can be:
2595 * No devices, no size, no level
2596 * Equivalent to STOP_ARRAY ioctl
2598 * May have some settings, but array is not active
2599 * all IO results in error
2600 * When written, doesn't tear down array, but just stops it
2601 * suspended (not supported yet)
2602 * All IO requests will block. The array can be reconfigured.
2603 * Writing this, if accepted, will block until array is quiescent
2605 * no resync can happen. no superblocks get written.
2606 * write requests fail
2608 * like readonly, but behaves like 'clean' on a write request.
2610 * clean - no pending writes, but otherwise active.
2611 * When written to inactive array, starts without resync
2612 * If a write request arrives then
2613 * if metadata is known, mark 'dirty' and switch to 'active'.
2614 * if not known, block and switch to write-pending
2615 * If written to an active array that has pending writes, then fails.
2617 * fully active: IO and resync can be happening.
2618 * When written to inactive array, starts with resync
2621 * clean, but writes are blocked waiting for 'active' to be written.
2624 * like active, but no writes have been seen for a while (100msec).
2627 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2628 write_pending
, active_idle
, bad_word
};
2629 static char *array_states
[] = {
2630 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2631 "write-pending", "active-idle", NULL
};
2633 static int match_word(const char *word
, char **list
)
2636 for (n
=0; list
[n
]; n
++)
2637 if (cmd_match(word
, list
[n
]))
2643 array_state_show(mddev_t
*mddev
, char *page
)
2645 enum array_state st
= inactive
;
2658 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2660 else if (mddev
->safemode
)
2666 if (list_empty(&mddev
->disks
) &&
2667 mddev
->raid_disks
== 0 &&
2673 return sprintf(page
, "%s\n", array_states
[st
]);
2676 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2677 static int do_md_run(mddev_t
* mddev
);
2678 static int restart_array(mddev_t
*mddev
);
2681 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2684 enum array_state st
= match_word(buf
, array_states
);
2689 /* stopping an active array */
2690 if (atomic_read(&mddev
->openers
) > 0)
2692 err
= do_md_stop(mddev
, 0, 0);
2695 /* stopping an active array */
2697 if (atomic_read(&mddev
->openers
) > 0)
2699 err
= do_md_stop(mddev
, 2, 0);
2701 err
= 0; /* already inactive */
2704 break; /* not supported yet */
2707 err
= do_md_stop(mddev
, 1, 0);
2710 set_disk_ro(mddev
->gendisk
, 1);
2711 err
= do_md_run(mddev
);
2717 err
= do_md_stop(mddev
, 1, 0);
2718 else if (mddev
->ro
== 1)
2719 err
= restart_array(mddev
);
2722 set_disk_ro(mddev
->gendisk
, 0);
2726 err
= do_md_run(mddev
);
2731 restart_array(mddev
);
2732 spin_lock_irq(&mddev
->write_lock
);
2733 if (atomic_read(&mddev
->writes_pending
) == 0) {
2734 if (mddev
->in_sync
== 0) {
2736 if (mddev
->safemode
== 1)
2737 mddev
->safemode
= 0;
2738 if (mddev
->persistent
)
2739 set_bit(MD_CHANGE_CLEAN
,
2745 spin_unlock_irq(&mddev
->write_lock
);
2748 mddev
->recovery_cp
= MaxSector
;
2749 err
= do_md_run(mddev
);
2754 restart_array(mddev
);
2755 if (mddev
->external
)
2756 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2757 wake_up(&mddev
->sb_wait
);
2761 set_disk_ro(mddev
->gendisk
, 0);
2762 err
= do_md_run(mddev
);
2767 /* these cannot be set */
2773 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
2777 static struct md_sysfs_entry md_array_state
=
2778 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2781 null_show(mddev_t
*mddev
, char *page
)
2787 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2789 /* buf must be %d:%d\n? giving major and minor numbers */
2790 /* The new device is added to the array.
2791 * If the array has a persistent superblock, we read the
2792 * superblock to initialise info and check validity.
2793 * Otherwise, only checking done is that in bind_rdev_to_array,
2794 * which mainly checks size.
2797 int major
= simple_strtoul(buf
, &e
, 10);
2803 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2805 minor
= simple_strtoul(e
+1, &e
, 10);
2806 if (*e
&& *e
!= '\n')
2808 dev
= MKDEV(major
, minor
);
2809 if (major
!= MAJOR(dev
) ||
2810 minor
!= MINOR(dev
))
2814 if (mddev
->persistent
) {
2815 rdev
= md_import_device(dev
, mddev
->major_version
,
2816 mddev
->minor_version
);
2817 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2818 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2819 mdk_rdev_t
, same_set
);
2820 err
= super_types
[mddev
->major_version
]
2821 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2825 } else if (mddev
->external
)
2826 rdev
= md_import_device(dev
, -2, -1);
2828 rdev
= md_import_device(dev
, -1, -1);
2831 return PTR_ERR(rdev
);
2832 err
= bind_rdev_to_array(rdev
, mddev
);
2836 return err
? err
: len
;
2839 static struct md_sysfs_entry md_new_device
=
2840 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2843 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2846 unsigned long chunk
, end_chunk
;
2850 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2852 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2853 if (buf
== end
) break;
2854 if (*end
== '-') { /* range */
2856 end_chunk
= simple_strtoul(buf
, &end
, 0);
2857 if (buf
== end
) break;
2859 if (*end
&& !isspace(*end
)) break;
2860 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2862 while (isspace(*buf
)) buf
++;
2864 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2869 static struct md_sysfs_entry md_bitmap
=
2870 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2873 size_show(mddev_t
*mddev
, char *page
)
2875 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2878 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
2881 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2883 /* If array is inactive, we can reduce the component size, but
2884 * not increase it (except from 0).
2885 * If array is active, we can try an on-line resize
2889 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2890 if (!*buf
|| *buf
== '\n' ||
2895 err
= update_size(mddev
, size
* 2);
2896 md_update_sb(mddev
, 1);
2898 if (mddev
->size
== 0 ||
2904 return err
? err
: len
;
2907 static struct md_sysfs_entry md_size
=
2908 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2913 * 'none' for arrays with no metadata (good luck...)
2914 * 'external' for arrays with externally managed metadata,
2915 * or N.M for internally known formats
2918 metadata_show(mddev_t
*mddev
, char *page
)
2920 if (mddev
->persistent
)
2921 return sprintf(page
, "%d.%d\n",
2922 mddev
->major_version
, mddev
->minor_version
);
2923 else if (mddev
->external
)
2924 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
2926 return sprintf(page
, "none\n");
2930 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2934 /* Changing the details of 'external' metadata is
2935 * always permitted. Otherwise there must be
2936 * no devices attached to the array.
2938 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
2940 else if (!list_empty(&mddev
->disks
))
2943 if (cmd_match(buf
, "none")) {
2944 mddev
->persistent
= 0;
2945 mddev
->external
= 0;
2946 mddev
->major_version
= 0;
2947 mddev
->minor_version
= 90;
2950 if (strncmp(buf
, "external:", 9) == 0) {
2951 size_t namelen
= len
-9;
2952 if (namelen
>= sizeof(mddev
->metadata_type
))
2953 namelen
= sizeof(mddev
->metadata_type
)-1;
2954 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
2955 mddev
->metadata_type
[namelen
] = 0;
2956 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
2957 mddev
->metadata_type
[--namelen
] = 0;
2958 mddev
->persistent
= 0;
2959 mddev
->external
= 1;
2960 mddev
->major_version
= 0;
2961 mddev
->minor_version
= 90;
2964 major
= simple_strtoul(buf
, &e
, 10);
2965 if (e
==buf
|| *e
!= '.')
2968 minor
= simple_strtoul(buf
, &e
, 10);
2969 if (e
==buf
|| (*e
&& *e
!= '\n') )
2971 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2973 mddev
->major_version
= major
;
2974 mddev
->minor_version
= minor
;
2975 mddev
->persistent
= 1;
2976 mddev
->external
= 0;
2980 static struct md_sysfs_entry md_metadata
=
2981 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2984 action_show(mddev_t
*mddev
, char *page
)
2986 char *type
= "idle";
2987 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2988 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
2989 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2991 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2992 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2994 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2998 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3001 return sprintf(page
, "%s\n", type
);
3005 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3007 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3010 if (cmd_match(page
, "idle")) {
3011 if (mddev
->sync_thread
) {
3012 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3013 md_unregister_thread(mddev
->sync_thread
);
3014 mddev
->sync_thread
= NULL
;
3015 mddev
->recovery
= 0;
3017 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3018 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3020 else if (cmd_match(page
, "resync"))
3021 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3022 else if (cmd_match(page
, "recover")) {
3023 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3024 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3025 } else if (cmd_match(page
, "reshape")) {
3027 if (mddev
->pers
->start_reshape
== NULL
)
3029 err
= mddev
->pers
->start_reshape(mddev
);
3032 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3034 if (cmd_match(page
, "check"))
3035 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3036 else if (!cmd_match(page
, "repair"))
3038 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3039 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3041 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3042 md_wakeup_thread(mddev
->thread
);
3043 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
3048 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3050 return sprintf(page
, "%llu\n",
3051 (unsigned long long) mddev
->resync_mismatches
);
3054 static struct md_sysfs_entry md_scan_mode
=
3055 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3058 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3061 sync_min_show(mddev_t
*mddev
, char *page
)
3063 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3064 mddev
->sync_speed_min
? "local": "system");
3068 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3072 if (strncmp(buf
, "system", 6)==0) {
3073 mddev
->sync_speed_min
= 0;
3076 min
= simple_strtoul(buf
, &e
, 10);
3077 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3079 mddev
->sync_speed_min
= min
;
3083 static struct md_sysfs_entry md_sync_min
=
3084 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3087 sync_max_show(mddev_t
*mddev
, char *page
)
3089 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3090 mddev
->sync_speed_max
? "local": "system");
3094 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3098 if (strncmp(buf
, "system", 6)==0) {
3099 mddev
->sync_speed_max
= 0;
3102 max
= simple_strtoul(buf
, &e
, 10);
3103 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3105 mddev
->sync_speed_max
= max
;
3109 static struct md_sysfs_entry md_sync_max
=
3110 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3113 degraded_show(mddev_t
*mddev
, char *page
)
3115 return sprintf(page
, "%d\n", mddev
->degraded
);
3117 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3120 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3122 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3126 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3130 if (strict_strtol(buf
, 10, &n
))
3133 if (n
!= 0 && n
!= 1)
3136 mddev
->parallel_resync
= n
;
3138 if (mddev
->sync_thread
)
3139 wake_up(&resync_wait
);
3144 /* force parallel resync, even with shared block devices */
3145 static struct md_sysfs_entry md_sync_force_parallel
=
3146 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3147 sync_force_parallel_show
, sync_force_parallel_store
);
3150 sync_speed_show(mddev_t
*mddev
, char *page
)
3152 unsigned long resync
, dt
, db
;
3153 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3154 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3156 db
= resync
- mddev
->resync_mark_cnt
;
3157 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3160 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3163 sync_completed_show(mddev_t
*mddev
, char *page
)
3165 unsigned long max_blocks
, resync
;
3167 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3168 max_blocks
= mddev
->resync_max_sectors
;
3170 max_blocks
= mddev
->size
<< 1;
3172 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3173 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3176 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3179 min_sync_show(mddev_t
*mddev
, char *page
)
3181 return sprintf(page
, "%llu\n",
3182 (unsigned long long)mddev
->resync_min
);
3185 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3187 unsigned long long min
;
3188 if (strict_strtoull(buf
, 10, &min
))
3190 if (min
> mddev
->resync_max
)
3192 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3195 /* Must be a multiple of chunk_size */
3196 if (mddev
->chunk_size
) {
3197 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3200 mddev
->resync_min
= min
;
3205 static struct md_sysfs_entry md_min_sync
=
3206 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3209 max_sync_show(mddev_t
*mddev
, char *page
)
3211 if (mddev
->resync_max
== MaxSector
)
3212 return sprintf(page
, "max\n");
3214 return sprintf(page
, "%llu\n",
3215 (unsigned long long)mddev
->resync_max
);
3218 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3220 if (strncmp(buf
, "max", 3) == 0)
3221 mddev
->resync_max
= MaxSector
;
3223 unsigned long long max
;
3224 if (strict_strtoull(buf
, 10, &max
))
3226 if (max
< mddev
->resync_min
)
3228 if (max
< mddev
->resync_max
&&
3229 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3232 /* Must be a multiple of chunk_size */
3233 if (mddev
->chunk_size
) {
3234 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3237 mddev
->resync_max
= max
;
3239 wake_up(&mddev
->recovery_wait
);
3243 static struct md_sysfs_entry md_max_sync
=
3244 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3247 suspend_lo_show(mddev_t
*mddev
, char *page
)
3249 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3253 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3256 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3258 if (mddev
->pers
->quiesce
== NULL
)
3260 if (buf
== e
|| (*e
&& *e
!= '\n'))
3262 if (new >= mddev
->suspend_hi
||
3263 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3264 mddev
->suspend_lo
= new;
3265 mddev
->pers
->quiesce(mddev
, 2);
3270 static struct md_sysfs_entry md_suspend_lo
=
3271 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3275 suspend_hi_show(mddev_t
*mddev
, char *page
)
3277 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3281 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3284 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3286 if (mddev
->pers
->quiesce
== NULL
)
3288 if (buf
== e
|| (*e
&& *e
!= '\n'))
3290 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3291 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3292 mddev
->suspend_hi
= new;
3293 mddev
->pers
->quiesce(mddev
, 1);
3294 mddev
->pers
->quiesce(mddev
, 0);
3299 static struct md_sysfs_entry md_suspend_hi
=
3300 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3303 reshape_position_show(mddev_t
*mddev
, char *page
)
3305 if (mddev
->reshape_position
!= MaxSector
)
3306 return sprintf(page
, "%llu\n",
3307 (unsigned long long)mddev
->reshape_position
);
3308 strcpy(page
, "none\n");
3313 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3316 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3319 if (buf
== e
|| (*e
&& *e
!= '\n'))
3321 mddev
->reshape_position
= new;
3322 mddev
->delta_disks
= 0;
3323 mddev
->new_level
= mddev
->level
;
3324 mddev
->new_layout
= mddev
->layout
;
3325 mddev
->new_chunk
= mddev
->chunk_size
;
3329 static struct md_sysfs_entry md_reshape_position
=
3330 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3331 reshape_position_store
);
3334 static struct attribute
*md_default_attrs
[] = {
3337 &md_raid_disks
.attr
,
3338 &md_chunk_size
.attr
,
3340 &md_resync_start
.attr
,
3342 &md_new_device
.attr
,
3343 &md_safe_delay
.attr
,
3344 &md_array_state
.attr
,
3345 &md_reshape_position
.attr
,
3349 static struct attribute
*md_redundancy_attrs
[] = {
3351 &md_mismatches
.attr
,
3354 &md_sync_speed
.attr
,
3355 &md_sync_force_parallel
.attr
,
3356 &md_sync_completed
.attr
,
3359 &md_suspend_lo
.attr
,
3360 &md_suspend_hi
.attr
,
3365 static struct attribute_group md_redundancy_group
= {
3367 .attrs
= md_redundancy_attrs
,
3372 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3374 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3375 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3380 rv
= mddev_lock(mddev
);
3382 rv
= entry
->show(mddev
, page
);
3383 mddev_unlock(mddev
);
3389 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3390 const char *page
, size_t length
)
3392 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3393 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3398 if (!capable(CAP_SYS_ADMIN
))
3400 rv
= mddev_lock(mddev
);
3402 rv
= entry
->store(mddev
, page
, length
);
3403 mddev_unlock(mddev
);
3408 static void md_free(struct kobject
*ko
)
3410 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3414 static struct sysfs_ops md_sysfs_ops
= {
3415 .show
= md_attr_show
,
3416 .store
= md_attr_store
,
3418 static struct kobj_type md_ktype
= {
3420 .sysfs_ops
= &md_sysfs_ops
,
3421 .default_attrs
= md_default_attrs
,
3426 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3428 static DEFINE_MUTEX(disks_mutex
);
3429 mddev_t
*mddev
= mddev_find(dev
);
3430 struct gendisk
*disk
;
3431 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3432 int shift
= partitioned
? MdpMinorShift
: 0;
3433 int unit
= MINOR(dev
) >> shift
;
3439 mutex_lock(&disks_mutex
);
3440 if (mddev
->gendisk
) {
3441 mutex_unlock(&disks_mutex
);
3445 disk
= alloc_disk(1 << shift
);
3447 mutex_unlock(&disks_mutex
);
3451 disk
->major
= MAJOR(dev
);
3452 disk
->first_minor
= unit
<< shift
;
3454 sprintf(disk
->disk_name
, "md_d%d", unit
);
3456 sprintf(disk
->disk_name
, "md%d", unit
);
3457 disk
->fops
= &md_fops
;
3458 disk
->private_data
= mddev
;
3459 disk
->queue
= mddev
->queue
;
3461 mddev
->gendisk
= disk
;
3462 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3463 &disk_to_dev(disk
)->kobj
, "%s", "md");
3464 mutex_unlock(&disks_mutex
);
3466 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3469 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3473 static void md_safemode_timeout(unsigned long data
)
3475 mddev_t
*mddev
= (mddev_t
*) data
;
3477 if (!atomic_read(&mddev
->writes_pending
)) {
3478 mddev
->safemode
= 1;
3479 if (mddev
->external
)
3480 set_bit(MD_NOTIFY_ARRAY_STATE
, &mddev
->flags
);
3482 md_wakeup_thread(mddev
->thread
);
3485 static int start_dirty_degraded
;
3487 static int do_md_run(mddev_t
* mddev
)
3491 struct list_head
*tmp
;
3493 struct gendisk
*disk
;
3494 struct mdk_personality
*pers
;
3495 char b
[BDEVNAME_SIZE
];
3497 if (list_empty(&mddev
->disks
))
3498 /* cannot run an array with no devices.. */
3505 * Analyze all RAID superblock(s)
3507 if (!mddev
->raid_disks
) {
3508 if (!mddev
->persistent
)
3513 chunk_size
= mddev
->chunk_size
;
3516 if (chunk_size
> MAX_CHUNK_SIZE
) {
3517 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3518 chunk_size
, MAX_CHUNK_SIZE
);
3522 * chunk-size has to be a power of 2
3524 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3525 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3529 /* devices must have minimum size of one chunk */
3530 rdev_for_each(rdev
, tmp
, mddev
) {
3531 if (test_bit(Faulty
, &rdev
->flags
))
3533 if (rdev
->size
< chunk_size
/ 1024) {
3535 "md: Dev %s smaller than chunk_size:"
3537 bdevname(rdev
->bdev
,b
),
3538 (unsigned long long)rdev
->size
,
3545 if (mddev
->level
!= LEVEL_NONE
)
3546 request_module("md-level-%d", mddev
->level
);
3547 else if (mddev
->clevel
[0])
3548 request_module("md-%s", mddev
->clevel
);
3551 * Drop all container device buffers, from now on
3552 * the only valid external interface is through the md
3555 rdev_for_each(rdev
, tmp
, mddev
) {
3556 if (test_bit(Faulty
, &rdev
->flags
))
3558 sync_blockdev(rdev
->bdev
);
3559 invalidate_bdev(rdev
->bdev
);
3561 /* perform some consistency tests on the device.
3562 * We don't want the data to overlap the metadata,
3563 * Internal Bitmap issues has handled elsewhere.
3565 if (rdev
->data_offset
< rdev
->sb_start
) {
3567 rdev
->data_offset
+ mddev
->size
*2
3569 printk("md: %s: data overlaps metadata\n",
3574 if (rdev
->sb_start
+ rdev
->sb_size
/512
3575 > rdev
->data_offset
) {
3576 printk("md: %s: metadata overlaps data\n",
3581 sysfs_notify(&rdev
->kobj
, NULL
, "state");
3584 md_probe(mddev
->unit
, NULL
, NULL
);
3585 disk
= mddev
->gendisk
;
3589 spin_lock(&pers_lock
);
3590 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3591 if (!pers
|| !try_module_get(pers
->owner
)) {
3592 spin_unlock(&pers_lock
);
3593 if (mddev
->level
!= LEVEL_NONE
)
3594 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3597 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3602 spin_unlock(&pers_lock
);
3603 mddev
->level
= pers
->level
;
3604 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3606 if (mddev
->reshape_position
!= MaxSector
&&
3607 pers
->start_reshape
== NULL
) {
3608 /* This personality cannot handle reshaping... */
3610 module_put(pers
->owner
);
3614 if (pers
->sync_request
) {
3615 /* Warn if this is a potentially silly
3618 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3620 struct list_head
*tmp2
;
3622 rdev_for_each(rdev
, tmp
, mddev
) {
3623 rdev_for_each(rdev2
, tmp2
, mddev
) {
3625 rdev
->bdev
->bd_contains
==
3626 rdev2
->bdev
->bd_contains
) {
3628 "%s: WARNING: %s appears to be"
3629 " on the same physical disk as"
3632 bdevname(rdev
->bdev
,b
),
3633 bdevname(rdev2
->bdev
,b2
));
3640 "True protection against single-disk"
3641 " failure might be compromised.\n");
3644 mddev
->recovery
= 0;
3645 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3646 mddev
->barriers_work
= 1;
3647 mddev
->ok_start_degraded
= start_dirty_degraded
;
3650 mddev
->ro
= 2; /* read-only, but switch on first write */
3652 err
= mddev
->pers
->run(mddev
);
3654 printk(KERN_ERR
"md: pers->run() failed ...\n");
3655 else if (mddev
->pers
->sync_request
) {
3656 err
= bitmap_create(mddev
);
3658 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3659 mdname(mddev
), err
);
3660 mddev
->pers
->stop(mddev
);
3664 module_put(mddev
->pers
->owner
);
3666 bitmap_destroy(mddev
);
3669 if (mddev
->pers
->sync_request
) {
3670 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3672 "md: cannot register extra attributes for %s\n",
3674 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3677 atomic_set(&mddev
->writes_pending
,0);
3678 mddev
->safemode
= 0;
3679 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3680 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3681 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3684 rdev_for_each(rdev
, tmp
, mddev
)
3685 if (rdev
->raid_disk
>= 0) {
3687 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3688 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3689 printk("md: cannot register %s for %s\n",
3693 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3696 md_update_sb(mddev
, 0);
3698 set_capacity(disk
, mddev
->array_sectors
);
3700 /* If we call blk_queue_make_request here, it will
3701 * re-initialise max_sectors etc which may have been
3702 * refined inside -> run. So just set the bits we need to set.
3703 * Most initialisation happended when we called
3704 * blk_queue_make_request(..., md_fail_request)
3707 mddev
->queue
->queuedata
= mddev
;
3708 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3710 /* If there is a partially-recovered drive we need to
3711 * start recovery here. If we leave it to md_check_recovery,
3712 * it will remove the drives and not do the right thing
3714 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3715 struct list_head
*rtmp
;
3717 rdev_for_each(rdev
, rtmp
, mddev
)
3718 if (rdev
->raid_disk
>= 0 &&
3719 !test_bit(In_sync
, &rdev
->flags
) &&
3720 !test_bit(Faulty
, &rdev
->flags
))
3721 /* complete an interrupted recovery */
3723 if (spares
&& mddev
->pers
->sync_request
) {
3724 mddev
->recovery
= 0;
3725 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3726 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3729 if (!mddev
->sync_thread
) {
3730 printk(KERN_ERR
"%s: could not start resync"
3733 /* leave the spares where they are, it shouldn't hurt */
3734 mddev
->recovery
= 0;
3738 md_wakeup_thread(mddev
->thread
);
3739 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3742 md_new_event(mddev
);
3743 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3744 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
3745 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3746 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
3750 static int restart_array(mddev_t
*mddev
)
3752 struct gendisk
*disk
= mddev
->gendisk
;
3754 /* Complain if it has no devices */
3755 if (list_empty(&mddev
->disks
))
3761 mddev
->safemode
= 0;
3763 set_disk_ro(disk
, 0);
3764 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3766 /* Kick recovery or resync if necessary */
3767 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3768 md_wakeup_thread(mddev
->thread
);
3769 md_wakeup_thread(mddev
->sync_thread
);
3770 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3774 /* similar to deny_write_access, but accounts for our holding a reference
3775 * to the file ourselves */
3776 static int deny_bitmap_write_access(struct file
* file
)
3778 struct inode
*inode
= file
->f_mapping
->host
;
3780 spin_lock(&inode
->i_lock
);
3781 if (atomic_read(&inode
->i_writecount
) > 1) {
3782 spin_unlock(&inode
->i_lock
);
3785 atomic_set(&inode
->i_writecount
, -1);
3786 spin_unlock(&inode
->i_lock
);
3791 static void restore_bitmap_write_access(struct file
*file
)
3793 struct inode
*inode
= file
->f_mapping
->host
;
3795 spin_lock(&inode
->i_lock
);
3796 atomic_set(&inode
->i_writecount
, 1);
3797 spin_unlock(&inode
->i_lock
);
3801 * 0 - completely stop and dis-assemble array
3802 * 1 - switch to readonly
3803 * 2 - stop but do not disassemble array
3805 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
3808 struct gendisk
*disk
= mddev
->gendisk
;
3810 if (atomic_read(&mddev
->openers
) > is_open
) {
3811 printk("md: %s still in use.\n",mdname(mddev
));
3817 if (mddev
->sync_thread
) {
3818 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3819 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3820 md_unregister_thread(mddev
->sync_thread
);
3821 mddev
->sync_thread
= NULL
;
3824 del_timer_sync(&mddev
->safemode_timer
);
3827 case 1: /* readonly */
3833 case 0: /* disassemble */
3835 bitmap_flush(mddev
);
3836 md_super_wait(mddev
);
3838 set_disk_ro(disk
, 0);
3839 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3840 mddev
->pers
->stop(mddev
);
3841 mddev
->queue
->merge_bvec_fn
= NULL
;
3842 mddev
->queue
->unplug_fn
= NULL
;
3843 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3844 if (mddev
->pers
->sync_request
)
3845 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3847 module_put(mddev
->pers
->owner
);
3849 /* tell userspace to handle 'inactive' */
3850 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3852 set_capacity(disk
, 0);
3858 if (!mddev
->in_sync
|| mddev
->flags
) {
3859 /* mark array as shutdown cleanly */
3861 md_update_sb(mddev
, 1);
3864 set_disk_ro(disk
, 1);
3865 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3869 * Free resources if final stop
3873 struct list_head
*tmp
;
3875 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3877 bitmap_destroy(mddev
);
3878 if (mddev
->bitmap_file
) {
3879 restore_bitmap_write_access(mddev
->bitmap_file
);
3880 fput(mddev
->bitmap_file
);
3881 mddev
->bitmap_file
= NULL
;
3883 mddev
->bitmap_offset
= 0;
3885 rdev_for_each(rdev
, tmp
, mddev
)
3886 if (rdev
->raid_disk
>= 0) {
3888 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3889 sysfs_remove_link(&mddev
->kobj
, nm
);
3892 /* make sure all md_delayed_delete calls have finished */
3893 flush_scheduled_work();
3895 export_array(mddev
);
3897 mddev
->array_sectors
= 0;
3899 mddev
->raid_disks
= 0;
3900 mddev
->recovery_cp
= 0;
3901 mddev
->resync_min
= 0;
3902 mddev
->resync_max
= MaxSector
;
3903 mddev
->reshape_position
= MaxSector
;
3904 mddev
->external
= 0;
3905 mddev
->persistent
= 0;
3906 mddev
->level
= LEVEL_NONE
;
3907 mddev
->clevel
[0] = 0;
3910 mddev
->metadata_type
[0] = 0;
3911 mddev
->chunk_size
= 0;
3912 mddev
->ctime
= mddev
->utime
= 0;
3914 mddev
->max_disks
= 0;
3916 mddev
->delta_disks
= 0;
3917 mddev
->new_level
= LEVEL_NONE
;
3918 mddev
->new_layout
= 0;
3919 mddev
->new_chunk
= 0;
3920 mddev
->curr_resync
= 0;
3921 mddev
->resync_mismatches
= 0;
3922 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
3923 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
3924 mddev
->recovery
= 0;
3927 mddev
->degraded
= 0;
3928 mddev
->barriers_work
= 0;
3929 mddev
->safemode
= 0;
3931 } else if (mddev
->pers
)
3932 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3935 md_new_event(mddev
);
3936 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3942 static void autorun_array(mddev_t
*mddev
)
3945 struct list_head
*tmp
;
3948 if (list_empty(&mddev
->disks
))
3951 printk(KERN_INFO
"md: running: ");
3953 rdev_for_each(rdev
, tmp
, mddev
) {
3954 char b
[BDEVNAME_SIZE
];
3955 printk("<%s>", bdevname(rdev
->bdev
,b
));
3959 err
= do_md_run(mddev
);
3961 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3962 do_md_stop(mddev
, 0, 0);
3967 * lets try to run arrays based on all disks that have arrived
3968 * until now. (those are in pending_raid_disks)
3970 * the method: pick the first pending disk, collect all disks with
3971 * the same UUID, remove all from the pending list and put them into
3972 * the 'same_array' list. Then order this list based on superblock
3973 * update time (freshest comes first), kick out 'old' disks and
3974 * compare superblocks. If everything's fine then run it.
3976 * If "unit" is allocated, then bump its reference count
3978 static void autorun_devices(int part
)
3980 struct list_head
*tmp
;
3981 mdk_rdev_t
*rdev0
, *rdev
;
3983 char b
[BDEVNAME_SIZE
];
3985 printk(KERN_INFO
"md: autorun ...\n");
3986 while (!list_empty(&pending_raid_disks
)) {
3989 LIST_HEAD(candidates
);
3990 rdev0
= list_entry(pending_raid_disks
.next
,
3991 mdk_rdev_t
, same_set
);
3993 printk(KERN_INFO
"md: considering %s ...\n",
3994 bdevname(rdev0
->bdev
,b
));
3995 INIT_LIST_HEAD(&candidates
);
3996 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
)
3997 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3998 printk(KERN_INFO
"md: adding %s ...\n",
3999 bdevname(rdev
->bdev
,b
));
4000 list_move(&rdev
->same_set
, &candidates
);
4003 * now we have a set of devices, with all of them having
4004 * mostly sane superblocks. It's time to allocate the
4008 dev
= MKDEV(mdp_major
,
4009 rdev0
->preferred_minor
<< MdpMinorShift
);
4010 unit
= MINOR(dev
) >> MdpMinorShift
;
4012 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4015 if (rdev0
->preferred_minor
!= unit
) {
4016 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4017 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4021 md_probe(dev
, NULL
, NULL
);
4022 mddev
= mddev_find(dev
);
4023 if (!mddev
|| !mddev
->gendisk
) {
4027 "md: cannot allocate memory for md drive.\n");
4030 if (mddev_lock(mddev
))
4031 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4033 else if (mddev
->raid_disks
|| mddev
->major_version
4034 || !list_empty(&mddev
->disks
)) {
4036 "md: %s already running, cannot run %s\n",
4037 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4038 mddev_unlock(mddev
);
4040 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4041 mddev
->persistent
= 1;
4042 rdev_for_each_list(rdev
, tmp
, candidates
) {
4043 list_del_init(&rdev
->same_set
);
4044 if (bind_rdev_to_array(rdev
, mddev
))
4047 autorun_array(mddev
);
4048 mddev_unlock(mddev
);
4050 /* on success, candidates will be empty, on error
4053 rdev_for_each_list(rdev
, tmp
, candidates
) {
4054 list_del_init(&rdev
->same_set
);
4059 printk(KERN_INFO
"md: ... autorun DONE.\n");
4061 #endif /* !MODULE */
4063 static int get_version(void __user
* arg
)
4067 ver
.major
= MD_MAJOR_VERSION
;
4068 ver
.minor
= MD_MINOR_VERSION
;
4069 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4071 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4077 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4079 mdu_array_info_t info
;
4080 int nr
,working
,active
,failed
,spare
;
4082 struct list_head
*tmp
;
4084 nr
=working
=active
=failed
=spare
=0;
4085 rdev_for_each(rdev
, tmp
, mddev
) {
4087 if (test_bit(Faulty
, &rdev
->flags
))
4091 if (test_bit(In_sync
, &rdev
->flags
))
4098 info
.major_version
= mddev
->major_version
;
4099 info
.minor_version
= mddev
->minor_version
;
4100 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4101 info
.ctime
= mddev
->ctime
;
4102 info
.level
= mddev
->level
;
4103 info
.size
= mddev
->size
;
4104 if (info
.size
!= mddev
->size
) /* overflow */
4107 info
.raid_disks
= mddev
->raid_disks
;
4108 info
.md_minor
= mddev
->md_minor
;
4109 info
.not_persistent
= !mddev
->persistent
;
4111 info
.utime
= mddev
->utime
;
4114 info
.state
= (1<<MD_SB_CLEAN
);
4115 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4116 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4117 info
.active_disks
= active
;
4118 info
.working_disks
= working
;
4119 info
.failed_disks
= failed
;
4120 info
.spare_disks
= spare
;
4122 info
.layout
= mddev
->layout
;
4123 info
.chunk_size
= mddev
->chunk_size
;
4125 if (copy_to_user(arg
, &info
, sizeof(info
)))
4131 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4133 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4134 char *ptr
, *buf
= NULL
;
4137 if (md_allow_write(mddev
))
4138 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4140 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4145 /* bitmap disabled, zero the first byte and copy out */
4146 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4147 file
->pathname
[0] = '\0';
4151 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4155 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4159 strcpy(file
->pathname
, ptr
);
4163 if (copy_to_user(arg
, file
, sizeof(*file
)))
4171 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4173 mdu_disk_info_t info
;
4176 if (copy_from_user(&info
, arg
, sizeof(info
)))
4179 rdev
= find_rdev_nr(mddev
, info
.number
);
4181 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4182 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4183 info
.raid_disk
= rdev
->raid_disk
;
4185 if (test_bit(Faulty
, &rdev
->flags
))
4186 info
.state
|= (1<<MD_DISK_FAULTY
);
4187 else if (test_bit(In_sync
, &rdev
->flags
)) {
4188 info
.state
|= (1<<MD_DISK_ACTIVE
);
4189 info
.state
|= (1<<MD_DISK_SYNC
);
4191 if (test_bit(WriteMostly
, &rdev
->flags
))
4192 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4194 info
.major
= info
.minor
= 0;
4195 info
.raid_disk
= -1;
4196 info
.state
= (1<<MD_DISK_REMOVED
);
4199 if (copy_to_user(arg
, &info
, sizeof(info
)))
4205 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4207 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4209 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4211 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4214 if (!mddev
->raid_disks
) {
4216 /* expecting a device which has a superblock */
4217 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4220 "md: md_import_device returned %ld\n",
4222 return PTR_ERR(rdev
);
4224 if (!list_empty(&mddev
->disks
)) {
4225 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4226 mdk_rdev_t
, same_set
);
4227 int err
= super_types
[mddev
->major_version
]
4228 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4231 "md: %s has different UUID to %s\n",
4232 bdevname(rdev
->bdev
,b
),
4233 bdevname(rdev0
->bdev
,b2
));
4238 err
= bind_rdev_to_array(rdev
, mddev
);
4245 * add_new_disk can be used once the array is assembled
4246 * to add "hot spares". They must already have a superblock
4251 if (!mddev
->pers
->hot_add_disk
) {
4253 "%s: personality does not support diskops!\n",
4257 if (mddev
->persistent
)
4258 rdev
= md_import_device(dev
, mddev
->major_version
,
4259 mddev
->minor_version
);
4261 rdev
= md_import_device(dev
, -1, -1);
4264 "md: md_import_device returned %ld\n",
4266 return PTR_ERR(rdev
);
4268 /* set save_raid_disk if appropriate */
4269 if (!mddev
->persistent
) {
4270 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4271 info
->raid_disk
< mddev
->raid_disks
)
4272 rdev
->raid_disk
= info
->raid_disk
;
4274 rdev
->raid_disk
= -1;
4276 super_types
[mddev
->major_version
].
4277 validate_super(mddev
, rdev
);
4278 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4280 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4281 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4282 set_bit(WriteMostly
, &rdev
->flags
);
4284 rdev
->raid_disk
= -1;
4285 err
= bind_rdev_to_array(rdev
, mddev
);
4286 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4287 /* If there is hot_add_disk but no hot_remove_disk
4288 * then added disks for geometry changes,
4289 * and should be added immediately.
4291 super_types
[mddev
->major_version
].
4292 validate_super(mddev
, rdev
);
4293 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4295 unbind_rdev_from_array(rdev
);
4300 sysfs_notify(&rdev
->kobj
, NULL
, "state");
4302 md_update_sb(mddev
, 1);
4303 if (mddev
->degraded
)
4304 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4305 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4306 md_wakeup_thread(mddev
->thread
);
4310 /* otherwise, add_new_disk is only allowed
4311 * for major_version==0 superblocks
4313 if (mddev
->major_version
!= 0) {
4314 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4319 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4321 rdev
= md_import_device(dev
, -1, 0);
4324 "md: error, md_import_device() returned %ld\n",
4326 return PTR_ERR(rdev
);
4328 rdev
->desc_nr
= info
->number
;
4329 if (info
->raid_disk
< mddev
->raid_disks
)
4330 rdev
->raid_disk
= info
->raid_disk
;
4332 rdev
->raid_disk
= -1;
4334 if (rdev
->raid_disk
< mddev
->raid_disks
)
4335 if (info
->state
& (1<<MD_DISK_SYNC
))
4336 set_bit(In_sync
, &rdev
->flags
);
4338 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4339 set_bit(WriteMostly
, &rdev
->flags
);
4341 if (!mddev
->persistent
) {
4342 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4343 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4345 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4346 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4348 err
= bind_rdev_to_array(rdev
, mddev
);
4358 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4360 char b
[BDEVNAME_SIZE
];
4363 rdev
= find_rdev(mddev
, dev
);
4367 if (rdev
->raid_disk
>= 0)
4370 kick_rdev_from_array(rdev
);
4371 md_update_sb(mddev
, 1);
4372 md_new_event(mddev
);
4376 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4377 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4381 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4383 char b
[BDEVNAME_SIZE
];
4390 if (mddev
->major_version
!= 0) {
4391 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4392 " version-0 superblocks.\n",
4396 if (!mddev
->pers
->hot_add_disk
) {
4398 "%s: personality does not support diskops!\n",
4403 rdev
= md_import_device(dev
, -1, 0);
4406 "md: error, md_import_device() returned %ld\n",
4411 if (mddev
->persistent
)
4412 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4414 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4416 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4418 if (test_bit(Faulty
, &rdev
->flags
)) {
4420 "md: can not hot-add faulty %s disk to %s!\n",
4421 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4425 clear_bit(In_sync
, &rdev
->flags
);
4427 rdev
->saved_raid_disk
= -1;
4428 err
= bind_rdev_to_array(rdev
, mddev
);
4433 * The rest should better be atomic, we can have disk failures
4434 * noticed in interrupt contexts ...
4437 if (rdev
->desc_nr
== mddev
->max_disks
) {
4438 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4441 goto abort_unbind_export
;
4444 rdev
->raid_disk
= -1;
4446 md_update_sb(mddev
, 1);
4449 * Kick recovery, maybe this spare has to be added to the
4450 * array immediately.
4452 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4453 md_wakeup_thread(mddev
->thread
);
4454 md_new_event(mddev
);
4457 abort_unbind_export
:
4458 unbind_rdev_from_array(rdev
);
4465 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4470 if (!mddev
->pers
->quiesce
)
4472 if (mddev
->recovery
|| mddev
->sync_thread
)
4474 /* we should be able to change the bitmap.. */
4480 return -EEXIST
; /* cannot add when bitmap is present */
4481 mddev
->bitmap_file
= fget(fd
);
4483 if (mddev
->bitmap_file
== NULL
) {
4484 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4489 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4491 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4493 fput(mddev
->bitmap_file
);
4494 mddev
->bitmap_file
= NULL
;
4497 mddev
->bitmap_offset
= 0; /* file overrides offset */
4498 } else if (mddev
->bitmap
== NULL
)
4499 return -ENOENT
; /* cannot remove what isn't there */
4502 mddev
->pers
->quiesce(mddev
, 1);
4504 err
= bitmap_create(mddev
);
4505 if (fd
< 0 || err
) {
4506 bitmap_destroy(mddev
);
4507 fd
= -1; /* make sure to put the file */
4509 mddev
->pers
->quiesce(mddev
, 0);
4512 if (mddev
->bitmap_file
) {
4513 restore_bitmap_write_access(mddev
->bitmap_file
);
4514 fput(mddev
->bitmap_file
);
4516 mddev
->bitmap_file
= NULL
;
4523 * set_array_info is used two different ways
4524 * The original usage is when creating a new array.
4525 * In this usage, raid_disks is > 0 and it together with
4526 * level, size, not_persistent,layout,chunksize determine the
4527 * shape of the array.
4528 * This will always create an array with a type-0.90.0 superblock.
4529 * The newer usage is when assembling an array.
4530 * In this case raid_disks will be 0, and the major_version field is
4531 * use to determine which style super-blocks are to be found on the devices.
4532 * The minor and patch _version numbers are also kept incase the
4533 * super_block handler wishes to interpret them.
4535 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4538 if (info
->raid_disks
== 0) {
4539 /* just setting version number for superblock loading */
4540 if (info
->major_version
< 0 ||
4541 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4542 super_types
[info
->major_version
].name
== NULL
) {
4543 /* maybe try to auto-load a module? */
4545 "md: superblock version %d not known\n",
4546 info
->major_version
);
4549 mddev
->major_version
= info
->major_version
;
4550 mddev
->minor_version
= info
->minor_version
;
4551 mddev
->patch_version
= info
->patch_version
;
4552 mddev
->persistent
= !info
->not_persistent
;
4555 mddev
->major_version
= MD_MAJOR_VERSION
;
4556 mddev
->minor_version
= MD_MINOR_VERSION
;
4557 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4558 mddev
->ctime
= get_seconds();
4560 mddev
->level
= info
->level
;
4561 mddev
->clevel
[0] = 0;
4562 mddev
->size
= info
->size
;
4563 mddev
->raid_disks
= info
->raid_disks
;
4564 /* don't set md_minor, it is determined by which /dev/md* was
4567 if (info
->state
& (1<<MD_SB_CLEAN
))
4568 mddev
->recovery_cp
= MaxSector
;
4570 mddev
->recovery_cp
= 0;
4571 mddev
->persistent
= ! info
->not_persistent
;
4572 mddev
->external
= 0;
4574 mddev
->layout
= info
->layout
;
4575 mddev
->chunk_size
= info
->chunk_size
;
4577 mddev
->max_disks
= MD_SB_DISKS
;
4579 if (mddev
->persistent
)
4581 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4583 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4584 mddev
->bitmap_offset
= 0;
4586 mddev
->reshape_position
= MaxSector
;
4589 * Generate a 128 bit UUID
4591 get_random_bytes(mddev
->uuid
, 16);
4593 mddev
->new_level
= mddev
->level
;
4594 mddev
->new_chunk
= mddev
->chunk_size
;
4595 mddev
->new_layout
= mddev
->layout
;
4596 mddev
->delta_disks
= 0;
4601 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
4605 struct list_head
*tmp
;
4606 int fit
= (num_sectors
== 0);
4608 if (mddev
->pers
->resize
== NULL
)
4610 /* The "num_sectors" is the number of sectors of each device that
4611 * is used. This can only make sense for arrays with redundancy.
4612 * linear and raid0 always use whatever space is available. We can only
4613 * consider changing this number if no resync or reconstruction is
4614 * happening, and if the new size is acceptable. It must fit before the
4615 * sb_start or, if that is <data_offset, it must fit before the size
4616 * of each device. If num_sectors is zero, we find the largest size
4620 if (mddev
->sync_thread
)
4623 /* Sorry, cannot grow a bitmap yet, just remove it,
4627 rdev_for_each(rdev
, tmp
, mddev
) {
4629 avail
= rdev
->size
* 2;
4631 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
4632 num_sectors
= avail
;
4633 if (avail
< num_sectors
)
4636 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
4638 struct block_device
*bdev
;
4640 bdev
= bdget_disk(mddev
->gendisk
, 0);
4642 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4643 i_size_write(bdev
->bd_inode
,
4644 (loff_t
)mddev
->array_sectors
<< 9);
4645 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4652 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4655 /* change the number of raid disks */
4656 if (mddev
->pers
->check_reshape
== NULL
)
4658 if (raid_disks
<= 0 ||
4659 raid_disks
>= mddev
->max_disks
)
4661 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4663 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4665 rv
= mddev
->pers
->check_reshape(mddev
);
4671 * update_array_info is used to change the configuration of an
4673 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4674 * fields in the info are checked against the array.
4675 * Any differences that cannot be handled will cause an error.
4676 * Normally, only one change can be managed at a time.
4678 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4684 /* calculate expected state,ignoring low bits */
4685 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4686 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4688 if (mddev
->major_version
!= info
->major_version
||
4689 mddev
->minor_version
!= info
->minor_version
||
4690 /* mddev->patch_version != info->patch_version || */
4691 mddev
->ctime
!= info
->ctime
||
4692 mddev
->level
!= info
->level
||
4693 /* mddev->layout != info->layout || */
4694 !mddev
->persistent
!= info
->not_persistent
||
4695 mddev
->chunk_size
!= info
->chunk_size
||
4696 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4697 ((state
^info
->state
) & 0xfffffe00)
4700 /* Check there is only one change */
4701 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4702 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4703 if (mddev
->layout
!= info
->layout
) cnt
++;
4704 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4705 if (cnt
== 0) return 0;
4706 if (cnt
> 1) return -EINVAL
;
4708 if (mddev
->layout
!= info
->layout
) {
4710 * we don't need to do anything at the md level, the
4711 * personality will take care of it all.
4713 if (mddev
->pers
->reconfig
== NULL
)
4716 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4718 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4719 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
4721 if (mddev
->raid_disks
!= info
->raid_disks
)
4722 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4724 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4725 if (mddev
->pers
->quiesce
== NULL
)
4727 if (mddev
->recovery
|| mddev
->sync_thread
)
4729 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4730 /* add the bitmap */
4733 if (mddev
->default_bitmap_offset
== 0)
4735 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4736 mddev
->pers
->quiesce(mddev
, 1);
4737 rv
= bitmap_create(mddev
);
4739 bitmap_destroy(mddev
);
4740 mddev
->pers
->quiesce(mddev
, 0);
4742 /* remove the bitmap */
4745 if (mddev
->bitmap
->file
)
4747 mddev
->pers
->quiesce(mddev
, 1);
4748 bitmap_destroy(mddev
);
4749 mddev
->pers
->quiesce(mddev
, 0);
4750 mddev
->bitmap_offset
= 0;
4753 md_update_sb(mddev
, 1);
4757 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4761 if (mddev
->pers
== NULL
)
4764 rdev
= find_rdev(mddev
, dev
);
4768 md_error(mddev
, rdev
);
4773 * We have a problem here : there is no easy way to give a CHS
4774 * virtual geometry. We currently pretend that we have a 2 heads
4775 * 4 sectors (with a BIG number of cylinders...). This drives
4776 * dosfs just mad... ;-)
4778 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4780 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4784 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4788 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
4789 unsigned int cmd
, unsigned long arg
)
4792 void __user
*argp
= (void __user
*)arg
;
4793 mddev_t
*mddev
= NULL
;
4795 if (!capable(CAP_SYS_ADMIN
))
4799 * Commands dealing with the RAID driver but not any
4805 err
= get_version(argp
);
4808 case PRINT_RAID_DEBUG
:
4816 autostart_arrays(arg
);
4823 * Commands creating/starting a new array:
4826 mddev
= bdev
->bd_disk
->private_data
;
4833 err
= mddev_lock(mddev
);
4836 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4843 case SET_ARRAY_INFO
:
4845 mdu_array_info_t info
;
4847 memset(&info
, 0, sizeof(info
));
4848 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4853 err
= update_array_info(mddev
, &info
);
4855 printk(KERN_WARNING
"md: couldn't update"
4856 " array info. %d\n", err
);
4861 if (!list_empty(&mddev
->disks
)) {
4863 "md: array %s already has disks!\n",
4868 if (mddev
->raid_disks
) {
4870 "md: array %s already initialised!\n",
4875 err
= set_array_info(mddev
, &info
);
4877 printk(KERN_WARNING
"md: couldn't set"
4878 " array info. %d\n", err
);
4888 * Commands querying/configuring an existing array:
4890 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4891 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4892 if ((!mddev
->raid_disks
&& !mddev
->external
)
4893 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4894 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4895 && cmd
!= GET_BITMAP_FILE
) {
4901 * Commands even a read-only array can execute:
4905 case GET_ARRAY_INFO
:
4906 err
= get_array_info(mddev
, argp
);
4909 case GET_BITMAP_FILE
:
4910 err
= get_bitmap_file(mddev
, argp
);
4914 err
= get_disk_info(mddev
, argp
);
4917 case RESTART_ARRAY_RW
:
4918 err
= restart_array(mddev
);
4922 err
= do_md_stop(mddev
, 0, 1);
4926 err
= do_md_stop(mddev
, 1, 1);
4932 * The remaining ioctls are changing the state of the
4933 * superblock, so we do not allow them on read-only arrays.
4934 * However non-MD ioctls (e.g. get-size) will still come through
4935 * here and hit the 'default' below, so only disallow
4936 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4938 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
4939 if (mddev
->ro
== 2) {
4941 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
4942 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4943 md_wakeup_thread(mddev
->thread
);
4954 mdu_disk_info_t info
;
4955 if (copy_from_user(&info
, argp
, sizeof(info
)))
4958 err
= add_new_disk(mddev
, &info
);
4962 case HOT_REMOVE_DISK
:
4963 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4967 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4970 case SET_DISK_FAULTY
:
4971 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4975 err
= do_md_run(mddev
);
4978 case SET_BITMAP_FILE
:
4979 err
= set_bitmap_file(mddev
, (int)arg
);
4989 mddev_unlock(mddev
);
4999 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5002 * Succeed if we can lock the mddev, which confirms that
5003 * it isn't being stopped right now.
5005 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5008 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5013 atomic_inc(&mddev
->openers
);
5014 mddev_unlock(mddev
);
5016 check_disk_change(bdev
);
5021 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5023 mddev_t
*mddev
= disk
->private_data
;
5026 atomic_dec(&mddev
->openers
);
5032 static int md_media_changed(struct gendisk
*disk
)
5034 mddev_t
*mddev
= disk
->private_data
;
5036 return mddev
->changed
;
5039 static int md_revalidate(struct gendisk
*disk
)
5041 mddev_t
*mddev
= disk
->private_data
;
5046 static struct block_device_operations md_fops
=
5048 .owner
= THIS_MODULE
,
5050 .release
= md_release
,
5051 .locked_ioctl
= md_ioctl
,
5052 .getgeo
= md_getgeo
,
5053 .media_changed
= md_media_changed
,
5054 .revalidate_disk
= md_revalidate
,
5057 static int md_thread(void * arg
)
5059 mdk_thread_t
*thread
= arg
;
5062 * md_thread is a 'system-thread', it's priority should be very
5063 * high. We avoid resource deadlocks individually in each
5064 * raid personality. (RAID5 does preallocation) We also use RR and
5065 * the very same RT priority as kswapd, thus we will never get
5066 * into a priority inversion deadlock.
5068 * we definitely have to have equal or higher priority than
5069 * bdflush, otherwise bdflush will deadlock if there are too
5070 * many dirty RAID5 blocks.
5073 allow_signal(SIGKILL
);
5074 while (!kthread_should_stop()) {
5076 /* We need to wait INTERRUPTIBLE so that
5077 * we don't add to the load-average.
5078 * That means we need to be sure no signals are
5081 if (signal_pending(current
))
5082 flush_signals(current
);
5084 wait_event_interruptible_timeout
5086 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5087 || kthread_should_stop(),
5090 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5092 thread
->run(thread
->mddev
);
5098 void md_wakeup_thread(mdk_thread_t
*thread
)
5101 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5102 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5103 wake_up(&thread
->wqueue
);
5107 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5110 mdk_thread_t
*thread
;
5112 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5116 init_waitqueue_head(&thread
->wqueue
);
5119 thread
->mddev
= mddev
;
5120 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5121 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5122 if (IS_ERR(thread
->tsk
)) {
5129 void md_unregister_thread(mdk_thread_t
*thread
)
5131 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5133 kthread_stop(thread
->tsk
);
5137 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5144 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5147 if (mddev
->external
)
5148 set_bit(Blocked
, &rdev
->flags
);
5150 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5152 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5153 __builtin_return_address(0),__builtin_return_address(1),
5154 __builtin_return_address(2),__builtin_return_address(3));
5158 if (!mddev
->pers
->error_handler
)
5160 mddev
->pers
->error_handler(mddev
,rdev
);
5161 if (mddev
->degraded
)
5162 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5163 set_bit(StateChanged
, &rdev
->flags
);
5164 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5165 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5166 md_wakeup_thread(mddev
->thread
);
5167 md_new_event_inintr(mddev
);
5170 /* seq_file implementation /proc/mdstat */
5172 static void status_unused(struct seq_file
*seq
)
5176 struct list_head
*tmp
;
5178 seq_printf(seq
, "unused devices: ");
5180 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
) {
5181 char b
[BDEVNAME_SIZE
];
5183 seq_printf(seq
, "%s ",
5184 bdevname(rdev
->bdev
,b
));
5187 seq_printf(seq
, "<none>");
5189 seq_printf(seq
, "\n");
5193 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5195 sector_t max_blocks
, resync
, res
;
5196 unsigned long dt
, db
, rt
;
5198 unsigned int per_milli
;
5200 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5202 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5203 max_blocks
= mddev
->resync_max_sectors
>> 1;
5205 max_blocks
= mddev
->size
;
5208 * Should not happen.
5214 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5215 * in a sector_t, and (max_blocks>>scale) will fit in a
5216 * u32, as those are the requirements for sector_div.
5217 * Thus 'scale' must be at least 10
5220 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5221 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5224 res
= (resync
>>scale
)*1000;
5225 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5229 int i
, x
= per_milli
/50, y
= 20-x
;
5230 seq_printf(seq
, "[");
5231 for (i
= 0; i
< x
; i
++)
5232 seq_printf(seq
, "=");
5233 seq_printf(seq
, ">");
5234 for (i
= 0; i
< y
; i
++)
5235 seq_printf(seq
, ".");
5236 seq_printf(seq
, "] ");
5238 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5239 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5241 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5243 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5244 "resync" : "recovery"))),
5245 per_milli
/10, per_milli
% 10,
5246 (unsigned long long) resync
,
5247 (unsigned long long) max_blocks
);
5250 * We do not want to overflow, so the order of operands and
5251 * the * 100 / 100 trick are important. We do a +1 to be
5252 * safe against division by zero. We only estimate anyway.
5254 * dt: time from mark until now
5255 * db: blocks written from mark until now
5256 * rt: remaining time
5258 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5260 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5261 - mddev
->resync_mark_cnt
;
5262 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5264 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5266 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5269 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5271 struct list_head
*tmp
;
5281 spin_lock(&all_mddevs_lock
);
5282 list_for_each(tmp
,&all_mddevs
)
5284 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5286 spin_unlock(&all_mddevs_lock
);
5289 spin_unlock(&all_mddevs_lock
);
5291 return (void*)2;/* tail */
5295 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5297 struct list_head
*tmp
;
5298 mddev_t
*next_mddev
, *mddev
= v
;
5304 spin_lock(&all_mddevs_lock
);
5306 tmp
= all_mddevs
.next
;
5308 tmp
= mddev
->all_mddevs
.next
;
5309 if (tmp
!= &all_mddevs
)
5310 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5312 next_mddev
= (void*)2;
5315 spin_unlock(&all_mddevs_lock
);
5323 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5327 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5331 struct mdstat_info
{
5335 static int md_seq_show(struct seq_file
*seq
, void *v
)
5339 struct list_head
*tmp2
;
5341 struct mdstat_info
*mi
= seq
->private;
5342 struct bitmap
*bitmap
;
5344 if (v
== (void*)1) {
5345 struct mdk_personality
*pers
;
5346 seq_printf(seq
, "Personalities : ");
5347 spin_lock(&pers_lock
);
5348 list_for_each_entry(pers
, &pers_list
, list
)
5349 seq_printf(seq
, "[%s] ", pers
->name
);
5351 spin_unlock(&pers_lock
);
5352 seq_printf(seq
, "\n");
5353 mi
->event
= atomic_read(&md_event_count
);
5356 if (v
== (void*)2) {
5361 if (mddev_lock(mddev
) < 0)
5364 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5365 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5366 mddev
->pers
? "" : "in");
5369 seq_printf(seq
, " (read-only)");
5371 seq_printf(seq
, " (auto-read-only)");
5372 seq_printf(seq
, " %s", mddev
->pers
->name
);
5376 rdev_for_each(rdev
, tmp2
, mddev
) {
5377 char b
[BDEVNAME_SIZE
];
5378 seq_printf(seq
, " %s[%d]",
5379 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5380 if (test_bit(WriteMostly
, &rdev
->flags
))
5381 seq_printf(seq
, "(W)");
5382 if (test_bit(Faulty
, &rdev
->flags
)) {
5383 seq_printf(seq
, "(F)");
5385 } else if (rdev
->raid_disk
< 0)
5386 seq_printf(seq
, "(S)"); /* spare */
5390 if (!list_empty(&mddev
->disks
)) {
5392 seq_printf(seq
, "\n %llu blocks",
5393 (unsigned long long)
5394 mddev
->array_sectors
/ 2);
5396 seq_printf(seq
, "\n %llu blocks",
5397 (unsigned long long)size
);
5399 if (mddev
->persistent
) {
5400 if (mddev
->major_version
!= 0 ||
5401 mddev
->minor_version
!= 90) {
5402 seq_printf(seq
," super %d.%d",
5403 mddev
->major_version
,
5404 mddev
->minor_version
);
5406 } else if (mddev
->external
)
5407 seq_printf(seq
, " super external:%s",
5408 mddev
->metadata_type
);
5410 seq_printf(seq
, " super non-persistent");
5413 mddev
->pers
->status(seq
, mddev
);
5414 seq_printf(seq
, "\n ");
5415 if (mddev
->pers
->sync_request
) {
5416 if (mddev
->curr_resync
> 2) {
5417 status_resync(seq
, mddev
);
5418 seq_printf(seq
, "\n ");
5419 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5420 seq_printf(seq
, "\tresync=DELAYED\n ");
5421 else if (mddev
->recovery_cp
< MaxSector
)
5422 seq_printf(seq
, "\tresync=PENDING\n ");
5425 seq_printf(seq
, "\n ");
5427 if ((bitmap
= mddev
->bitmap
)) {
5428 unsigned long chunk_kb
;
5429 unsigned long flags
;
5430 spin_lock_irqsave(&bitmap
->lock
, flags
);
5431 chunk_kb
= bitmap
->chunksize
>> 10;
5432 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5434 bitmap
->pages
- bitmap
->missing_pages
,
5436 (bitmap
->pages
- bitmap
->missing_pages
)
5437 << (PAGE_SHIFT
- 10),
5438 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5439 chunk_kb
? "KB" : "B");
5441 seq_printf(seq
, ", file: ");
5442 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5445 seq_printf(seq
, "\n");
5446 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5449 seq_printf(seq
, "\n");
5451 mddev_unlock(mddev
);
5456 static struct seq_operations md_seq_ops
= {
5457 .start
= md_seq_start
,
5458 .next
= md_seq_next
,
5459 .stop
= md_seq_stop
,
5460 .show
= md_seq_show
,
5463 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5466 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5470 error
= seq_open(file
, &md_seq_ops
);
5474 struct seq_file
*p
= file
->private_data
;
5476 mi
->event
= atomic_read(&md_event_count
);
5481 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5483 struct seq_file
*m
= filp
->private_data
;
5484 struct mdstat_info
*mi
= m
->private;
5487 poll_wait(filp
, &md_event_waiters
, wait
);
5489 /* always allow read */
5490 mask
= POLLIN
| POLLRDNORM
;
5492 if (mi
->event
!= atomic_read(&md_event_count
))
5493 mask
|= POLLERR
| POLLPRI
;
5497 static const struct file_operations md_seq_fops
= {
5498 .owner
= THIS_MODULE
,
5499 .open
= md_seq_open
,
5501 .llseek
= seq_lseek
,
5502 .release
= seq_release_private
,
5503 .poll
= mdstat_poll
,
5506 int register_md_personality(struct mdk_personality
*p
)
5508 spin_lock(&pers_lock
);
5509 list_add_tail(&p
->list
, &pers_list
);
5510 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5511 spin_unlock(&pers_lock
);
5515 int unregister_md_personality(struct mdk_personality
*p
)
5517 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5518 spin_lock(&pers_lock
);
5519 list_del_init(&p
->list
);
5520 spin_unlock(&pers_lock
);
5524 static int is_mddev_idle(mddev_t
*mddev
)
5532 rdev_for_each_rcu(rdev
, mddev
) {
5533 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5534 curr_events
= part_stat_read(&disk
->part0
, sectors
[0]) +
5535 part_stat_read(&disk
->part0
, sectors
[1]) -
5536 atomic_read(&disk
->sync_io
);
5537 /* sync IO will cause sync_io to increase before the disk_stats
5538 * as sync_io is counted when a request starts, and
5539 * disk_stats is counted when it completes.
5540 * So resync activity will cause curr_events to be smaller than
5541 * when there was no such activity.
5542 * non-sync IO will cause disk_stat to increase without
5543 * increasing sync_io so curr_events will (eventually)
5544 * be larger than it was before. Once it becomes
5545 * substantially larger, the test below will cause
5546 * the array to appear non-idle, and resync will slow
5548 * If there is a lot of outstanding resync activity when
5549 * we set last_event to curr_events, then all that activity
5550 * completing might cause the array to appear non-idle
5551 * and resync will be slowed down even though there might
5552 * not have been non-resync activity. This will only
5553 * happen once though. 'last_events' will soon reflect
5554 * the state where there is little or no outstanding
5555 * resync requests, and further resync activity will
5556 * always make curr_events less than last_events.
5559 if (curr_events
- rdev
->last_events
> 4096) {
5560 rdev
->last_events
= curr_events
;
5568 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5570 /* another "blocks" (512byte) blocks have been synced */
5571 atomic_sub(blocks
, &mddev
->recovery_active
);
5572 wake_up(&mddev
->recovery_wait
);
5574 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5575 md_wakeup_thread(mddev
->thread
);
5576 // stop recovery, signal do_sync ....
5581 /* md_write_start(mddev, bi)
5582 * If we need to update some array metadata (e.g. 'active' flag
5583 * in superblock) before writing, schedule a superblock update
5584 * and wait for it to complete.
5586 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5589 if (bio_data_dir(bi
) != WRITE
)
5592 BUG_ON(mddev
->ro
== 1);
5593 if (mddev
->ro
== 2) {
5594 /* need to switch to read/write */
5596 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5597 md_wakeup_thread(mddev
->thread
);
5598 md_wakeup_thread(mddev
->sync_thread
);
5601 atomic_inc(&mddev
->writes_pending
);
5602 if (mddev
->safemode
== 1)
5603 mddev
->safemode
= 0;
5604 if (mddev
->in_sync
) {
5605 spin_lock_irq(&mddev
->write_lock
);
5606 if (mddev
->in_sync
) {
5608 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5609 md_wakeup_thread(mddev
->thread
);
5612 spin_unlock_irq(&mddev
->write_lock
);
5615 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5616 wait_event(mddev
->sb_wait
,
5617 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5618 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5621 void md_write_end(mddev_t
*mddev
)
5623 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5624 if (mddev
->safemode
== 2)
5625 md_wakeup_thread(mddev
->thread
);
5626 else if (mddev
->safemode_delay
)
5627 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5631 /* md_allow_write(mddev)
5632 * Calling this ensures that the array is marked 'active' so that writes
5633 * may proceed without blocking. It is important to call this before
5634 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5635 * Must be called with mddev_lock held.
5637 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5638 * is dropped, so return -EAGAIN after notifying userspace.
5640 int md_allow_write(mddev_t
*mddev
)
5646 if (!mddev
->pers
->sync_request
)
5649 spin_lock_irq(&mddev
->write_lock
);
5650 if (mddev
->in_sync
) {
5652 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5653 if (mddev
->safemode_delay
&&
5654 mddev
->safemode
== 0)
5655 mddev
->safemode
= 1;
5656 spin_unlock_irq(&mddev
->write_lock
);
5657 md_update_sb(mddev
, 0);
5658 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5660 spin_unlock_irq(&mddev
->write_lock
);
5662 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
5667 EXPORT_SYMBOL_GPL(md_allow_write
);
5669 #define SYNC_MARKS 10
5670 #define SYNC_MARK_STEP (3*HZ)
5671 void md_do_sync(mddev_t
*mddev
)
5674 unsigned int currspeed
= 0,
5676 sector_t max_sectors
,j
, io_sectors
;
5677 unsigned long mark
[SYNC_MARKS
];
5678 sector_t mark_cnt
[SYNC_MARKS
];
5680 struct list_head
*tmp
;
5681 sector_t last_check
;
5683 struct list_head
*rtmp
;
5687 /* just incase thread restarts... */
5688 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5690 if (mddev
->ro
) /* never try to sync a read-only array */
5693 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5694 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5695 desc
= "data-check";
5696 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5697 desc
= "requested-resync";
5700 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5705 /* we overload curr_resync somewhat here.
5706 * 0 == not engaged in resync at all
5707 * 2 == checking that there is no conflict with another sync
5708 * 1 == like 2, but have yielded to allow conflicting resync to
5710 * other == active in resync - this many blocks
5712 * Before starting a resync we must have set curr_resync to
5713 * 2, and then checked that every "conflicting" array has curr_resync
5714 * less than ours. When we find one that is the same or higher
5715 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5716 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5717 * This will mean we have to start checking from the beginning again.
5722 mddev
->curr_resync
= 2;
5725 if (kthread_should_stop()) {
5726 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5729 for_each_mddev(mddev2
, tmp
) {
5730 if (mddev2
== mddev
)
5732 if (!mddev
->parallel_resync
5733 && mddev2
->curr_resync
5734 && match_mddev_units(mddev
, mddev2
)) {
5736 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5737 /* arbitrarily yield */
5738 mddev
->curr_resync
= 1;
5739 wake_up(&resync_wait
);
5741 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5742 /* no need to wait here, we can wait the next
5743 * time 'round when curr_resync == 2
5746 /* We need to wait 'interruptible' so as not to
5747 * contribute to the load average, and not to
5748 * be caught by 'softlockup'
5750 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
5751 if (!kthread_should_stop() &&
5752 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5753 printk(KERN_INFO
"md: delaying %s of %s"
5754 " until %s has finished (they"
5755 " share one or more physical units)\n",
5756 desc
, mdname(mddev
), mdname(mddev2
));
5758 if (signal_pending(current
))
5759 flush_signals(current
);
5761 finish_wait(&resync_wait
, &wq
);
5764 finish_wait(&resync_wait
, &wq
);
5767 } while (mddev
->curr_resync
< 2);
5770 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5771 /* resync follows the size requested by the personality,
5772 * which defaults to physical size, but can be virtual size
5774 max_sectors
= mddev
->resync_max_sectors
;
5775 mddev
->resync_mismatches
= 0;
5776 /* we don't use the checkpoint if there's a bitmap */
5777 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5778 j
= mddev
->resync_min
;
5779 else if (!mddev
->bitmap
)
5780 j
= mddev
->recovery_cp
;
5782 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5783 max_sectors
= mddev
->size
<< 1;
5785 /* recovery follows the physical size of devices */
5786 max_sectors
= mddev
->size
<< 1;
5788 rdev_for_each(rdev
, rtmp
, mddev
)
5789 if (rdev
->raid_disk
>= 0 &&
5790 !test_bit(Faulty
, &rdev
->flags
) &&
5791 !test_bit(In_sync
, &rdev
->flags
) &&
5792 rdev
->recovery_offset
< j
)
5793 j
= rdev
->recovery_offset
;
5796 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5797 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5798 " %d KB/sec/disk.\n", speed_min(mddev
));
5799 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5800 "(but not more than %d KB/sec) for %s.\n",
5801 speed_max(mddev
), desc
);
5803 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5806 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5808 mark_cnt
[m
] = io_sectors
;
5811 mddev
->resync_mark
= mark
[last_mark
];
5812 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5815 * Tune reconstruction:
5817 window
= 32*(PAGE_SIZE
/512);
5818 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5819 window
/2,(unsigned long long) max_sectors
/2);
5821 atomic_set(&mddev
->recovery_active
, 0);
5826 "md: resuming %s of %s from checkpoint.\n",
5827 desc
, mdname(mddev
));
5828 mddev
->curr_resync
= j
;
5831 while (j
< max_sectors
) {
5835 if (j
>= mddev
->resync_max
) {
5836 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5837 wait_event(mddev
->recovery_wait
,
5838 mddev
->resync_max
> j
5839 || kthread_should_stop());
5841 if (kthread_should_stop())
5843 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5844 currspeed
< speed_min(mddev
));
5846 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5850 if (!skipped
) { /* actual IO requested */
5851 io_sectors
+= sectors
;
5852 atomic_add(sectors
, &mddev
->recovery_active
);
5856 if (j
>1) mddev
->curr_resync
= j
;
5857 mddev
->curr_mark_cnt
= io_sectors
;
5858 if (last_check
== 0)
5859 /* this is the earliers that rebuilt will be
5860 * visible in /proc/mdstat
5862 md_new_event(mddev
);
5864 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5867 last_check
= io_sectors
;
5869 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5873 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5875 int next
= (last_mark
+1) % SYNC_MARKS
;
5877 mddev
->resync_mark
= mark
[next
];
5878 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5879 mark
[next
] = jiffies
;
5880 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5885 if (kthread_should_stop())
5890 * this loop exits only if either when we are slower than
5891 * the 'hard' speed limit, or the system was IO-idle for
5893 * the system might be non-idle CPU-wise, but we only care
5894 * about not overloading the IO subsystem. (things like an
5895 * e2fsck being done on the RAID array should execute fast)
5897 blk_unplug(mddev
->queue
);
5900 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5901 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5903 if (currspeed
> speed_min(mddev
)) {
5904 if ((currspeed
> speed_max(mddev
)) ||
5905 !is_mddev_idle(mddev
)) {
5911 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5913 * this also signals 'finished resyncing' to md_stop
5916 blk_unplug(mddev
->queue
);
5918 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5920 /* tell personality that we are finished */
5921 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5923 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5924 mddev
->curr_resync
> 2) {
5925 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5926 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5927 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5929 "md: checkpointing %s of %s.\n",
5930 desc
, mdname(mddev
));
5931 mddev
->recovery_cp
= mddev
->curr_resync
;
5934 mddev
->recovery_cp
= MaxSector
;
5936 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5937 mddev
->curr_resync
= MaxSector
;
5938 rdev_for_each(rdev
, rtmp
, mddev
)
5939 if (rdev
->raid_disk
>= 0 &&
5940 !test_bit(Faulty
, &rdev
->flags
) &&
5941 !test_bit(In_sync
, &rdev
->flags
) &&
5942 rdev
->recovery_offset
< mddev
->curr_resync
)
5943 rdev
->recovery_offset
= mddev
->curr_resync
;
5946 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5949 mddev
->curr_resync
= 0;
5950 mddev
->resync_min
= 0;
5951 mddev
->resync_max
= MaxSector
;
5952 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5953 wake_up(&resync_wait
);
5954 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5955 md_wakeup_thread(mddev
->thread
);
5960 * got a signal, exit.
5963 "md: md_do_sync() got signal ... exiting\n");
5964 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5968 EXPORT_SYMBOL_GPL(md_do_sync
);
5971 static int remove_and_add_spares(mddev_t
*mddev
)
5974 struct list_head
*rtmp
;
5977 rdev_for_each(rdev
, rtmp
, mddev
)
5978 if (rdev
->raid_disk
>= 0 &&
5979 !test_bit(Blocked
, &rdev
->flags
) &&
5980 (test_bit(Faulty
, &rdev
->flags
) ||
5981 ! test_bit(In_sync
, &rdev
->flags
)) &&
5982 atomic_read(&rdev
->nr_pending
)==0) {
5983 if (mddev
->pers
->hot_remove_disk(
5984 mddev
, rdev
->raid_disk
)==0) {
5986 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5987 sysfs_remove_link(&mddev
->kobj
, nm
);
5988 rdev
->raid_disk
= -1;
5992 if (mddev
->degraded
&& ! mddev
->ro
) {
5993 rdev_for_each(rdev
, rtmp
, mddev
) {
5994 if (rdev
->raid_disk
>= 0 &&
5995 !test_bit(In_sync
, &rdev
->flags
) &&
5996 !test_bit(Blocked
, &rdev
->flags
))
5998 if (rdev
->raid_disk
< 0
5999 && !test_bit(Faulty
, &rdev
->flags
)) {
6000 rdev
->recovery_offset
= 0;
6002 hot_add_disk(mddev
, rdev
) == 0) {
6004 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6005 if (sysfs_create_link(&mddev
->kobj
,
6008 "md: cannot register "
6012 md_new_event(mddev
);
6021 * This routine is regularly called by all per-raid-array threads to
6022 * deal with generic issues like resync and super-block update.
6023 * Raid personalities that don't have a thread (linear/raid0) do not
6024 * need this as they never do any recovery or update the superblock.
6026 * It does not do any resync itself, but rather "forks" off other threads
6027 * to do that as needed.
6028 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6029 * "->recovery" and create a thread at ->sync_thread.
6030 * When the thread finishes it sets MD_RECOVERY_DONE
6031 * and wakeups up this thread which will reap the thread and finish up.
6032 * This thread also removes any faulty devices (with nr_pending == 0).
6034 * The overall approach is:
6035 * 1/ if the superblock needs updating, update it.
6036 * 2/ If a recovery thread is running, don't do anything else.
6037 * 3/ If recovery has finished, clean up, possibly marking spares active.
6038 * 4/ If there are any faulty devices, remove them.
6039 * 5/ If array is degraded, try to add spares devices
6040 * 6/ If array has spares or is not in-sync, start a resync thread.
6042 void md_check_recovery(mddev_t
*mddev
)
6045 struct list_head
*rtmp
;
6049 bitmap_daemon_work(mddev
->bitmap
);
6051 if (test_and_clear_bit(MD_NOTIFY_ARRAY_STATE
, &mddev
->flags
))
6052 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
6057 if (signal_pending(current
)) {
6058 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6059 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6061 mddev
->safemode
= 2;
6063 flush_signals(current
);
6066 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6069 (mddev
->flags
&& !mddev
->external
) ||
6070 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6071 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6072 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6073 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6074 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6078 if (mddev_trylock(mddev
)) {
6082 /* Only thing we do on a ro array is remove
6085 remove_and_add_spares(mddev
);
6086 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6090 if (!mddev
->external
) {
6092 spin_lock_irq(&mddev
->write_lock
);
6093 if (mddev
->safemode
&&
6094 !atomic_read(&mddev
->writes_pending
) &&
6096 mddev
->recovery_cp
== MaxSector
) {
6099 if (mddev
->persistent
)
6100 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6102 if (mddev
->safemode
== 1)
6103 mddev
->safemode
= 0;
6104 spin_unlock_irq(&mddev
->write_lock
);
6106 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
6110 md_update_sb(mddev
, 0);
6112 rdev_for_each(rdev
, rtmp
, mddev
)
6113 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6114 sysfs_notify(&rdev
->kobj
, NULL
, "state");
6117 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6118 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6119 /* resync/recovery still happening */
6120 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6123 if (mddev
->sync_thread
) {
6124 /* resync has finished, collect result */
6125 md_unregister_thread(mddev
->sync_thread
);
6126 mddev
->sync_thread
= NULL
;
6127 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6128 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6130 /* activate any spares */
6131 if (mddev
->pers
->spare_active(mddev
))
6132 sysfs_notify(&mddev
->kobj
, NULL
,
6135 md_update_sb(mddev
, 1);
6137 /* if array is no-longer degraded, then any saved_raid_disk
6138 * information must be scrapped
6140 if (!mddev
->degraded
)
6141 rdev_for_each(rdev
, rtmp
, mddev
)
6142 rdev
->saved_raid_disk
= -1;
6144 mddev
->recovery
= 0;
6145 /* flag recovery needed just to double check */
6146 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6147 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6148 md_new_event(mddev
);
6151 /* Set RUNNING before clearing NEEDED to avoid
6152 * any transients in the value of "sync_action".
6154 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6155 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6156 /* Clear some bits that don't mean anything, but
6159 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6160 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6162 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6164 /* no recovery is running.
6165 * remove any failed drives, then
6166 * add spares if possible.
6167 * Spare are also removed and re-added, to allow
6168 * the personality to fail the re-add.
6171 if (mddev
->reshape_position
!= MaxSector
) {
6172 if (mddev
->pers
->check_reshape(mddev
) != 0)
6173 /* Cannot proceed */
6175 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6176 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6177 } else if ((spares
= remove_and_add_spares(mddev
))) {
6178 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6179 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6180 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6181 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6182 } else if (mddev
->recovery_cp
< MaxSector
) {
6183 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6184 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6185 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6186 /* nothing to be done ... */
6189 if (mddev
->pers
->sync_request
) {
6190 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6191 /* We are adding a device or devices to an array
6192 * which has the bitmap stored on all devices.
6193 * So make sure all bitmap pages get written
6195 bitmap_write_all(mddev
->bitmap
);
6197 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6200 if (!mddev
->sync_thread
) {
6201 printk(KERN_ERR
"%s: could not start resync"
6204 /* leave the spares where they are, it shouldn't hurt */
6205 mddev
->recovery
= 0;
6207 md_wakeup_thread(mddev
->sync_thread
);
6208 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6209 md_new_event(mddev
);
6212 if (!mddev
->sync_thread
) {
6213 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6214 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6216 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
6218 mddev_unlock(mddev
);
6222 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6224 sysfs_notify(&rdev
->kobj
, NULL
, "state");
6225 wait_event_timeout(rdev
->blocked_wait
,
6226 !test_bit(Blocked
, &rdev
->flags
),
6227 msecs_to_jiffies(5000));
6228 rdev_dec_pending(rdev
, mddev
);
6230 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6232 static int md_notify_reboot(struct notifier_block
*this,
6233 unsigned long code
, void *x
)
6235 struct list_head
*tmp
;
6238 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6240 printk(KERN_INFO
"md: stopping all md devices.\n");
6242 for_each_mddev(mddev
, tmp
)
6243 if (mddev_trylock(mddev
)) {
6244 /* Force a switch to readonly even array
6245 * appears to still be in use. Hence
6248 do_md_stop(mddev
, 1, 100);
6249 mddev_unlock(mddev
);
6252 * certain more exotic SCSI devices are known to be
6253 * volatile wrt too early system reboots. While the
6254 * right place to handle this issue is the given
6255 * driver, we do want to have a safe RAID driver ...
6262 static struct notifier_block md_notifier
= {
6263 .notifier_call
= md_notify_reboot
,
6265 .priority
= INT_MAX
, /* before any real devices */
6268 static void md_geninit(void)
6270 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6272 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6275 static int __init
md_init(void)
6277 if (register_blkdev(MAJOR_NR
, "md"))
6279 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6280 unregister_blkdev(MAJOR_NR
, "md");
6283 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6284 md_probe
, NULL
, NULL
);
6285 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6286 md_probe
, NULL
, NULL
);
6288 register_reboot_notifier(&md_notifier
);
6289 raid_table_header
= register_sysctl_table(raid_root_table
);
6299 * Searches all registered partitions for autorun RAID arrays
6303 static LIST_HEAD(all_detected_devices
);
6304 struct detected_devices_node
{
6305 struct list_head list
;
6309 void md_autodetect_dev(dev_t dev
)
6311 struct detected_devices_node
*node_detected_dev
;
6313 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6314 if (node_detected_dev
) {
6315 node_detected_dev
->dev
= dev
;
6316 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6318 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6319 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6324 static void autostart_arrays(int part
)
6327 struct detected_devices_node
*node_detected_dev
;
6329 int i_scanned
, i_passed
;
6334 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6336 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6338 node_detected_dev
= list_entry(all_detected_devices
.next
,
6339 struct detected_devices_node
, list
);
6340 list_del(&node_detected_dev
->list
);
6341 dev
= node_detected_dev
->dev
;
6342 kfree(node_detected_dev
);
6343 rdev
= md_import_device(dev
,0, 90);
6347 if (test_bit(Faulty
, &rdev
->flags
)) {
6351 set_bit(AutoDetected
, &rdev
->flags
);
6352 list_add(&rdev
->same_set
, &pending_raid_disks
);
6356 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6357 i_scanned
, i_passed
);
6359 autorun_devices(part
);
6362 #endif /* !MODULE */
6364 static __exit
void md_exit(void)
6367 struct list_head
*tmp
;
6369 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6370 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6372 unregister_blkdev(MAJOR_NR
,"md");
6373 unregister_blkdev(mdp_major
, "mdp");
6374 unregister_reboot_notifier(&md_notifier
);
6375 unregister_sysctl_table(raid_table_header
);
6376 remove_proc_entry("mdstat", NULL
);
6377 for_each_mddev(mddev
, tmp
) {
6378 struct gendisk
*disk
= mddev
->gendisk
;
6381 export_array(mddev
);
6384 mddev
->gendisk
= NULL
;
6389 subsys_initcall(md_init
);
6390 module_exit(md_exit
)
6392 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6394 return sprintf(buffer
, "%d", start_readonly
);
6396 static int set_ro(const char *val
, struct kernel_param
*kp
)
6399 int num
= simple_strtoul(val
, &e
, 10);
6400 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6401 start_readonly
= num
;
6407 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6408 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6411 EXPORT_SYMBOL(register_md_personality
);
6412 EXPORT_SYMBOL(unregister_md_personality
);
6413 EXPORT_SYMBOL(md_error
);
6414 EXPORT_SYMBOL(md_done_sync
);
6415 EXPORT_SYMBOL(md_write_start
);
6416 EXPORT_SYMBOL(md_write_end
);
6417 EXPORT_SYMBOL(md_register_thread
);
6418 EXPORT_SYMBOL(md_unregister_thread
);
6419 EXPORT_SYMBOL(md_wakeup_thread
);
6420 EXPORT_SYMBOL(md_check_recovery
);
6421 MODULE_LICENSE("GPL");
6423 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);