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 if (mddev
->sysfs_state
)
226 sysfs_put(mddev
->sysfs_state
);
227 mddev
->sysfs_state
= NULL
;
228 kobject_put(&mddev
->kobj
);
230 spin_unlock(&all_mddevs_lock
);
233 static mddev_t
* mddev_find(dev_t unit
)
235 mddev_t
*mddev
, *new = NULL
;
238 spin_lock(&all_mddevs_lock
);
239 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
240 if (mddev
->unit
== unit
) {
242 spin_unlock(&all_mddevs_lock
);
248 list_add(&new->all_mddevs
, &all_mddevs
);
249 spin_unlock(&all_mddevs_lock
);
252 spin_unlock(&all_mddevs_lock
);
254 new = kzalloc(sizeof(*new), GFP_KERNEL
);
259 if (MAJOR(unit
) == MD_MAJOR
)
260 new->md_minor
= MINOR(unit
);
262 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
264 mutex_init(&new->reconfig_mutex
);
265 INIT_LIST_HEAD(&new->disks
);
266 INIT_LIST_HEAD(&new->all_mddevs
);
267 init_timer(&new->safemode_timer
);
268 atomic_set(&new->active
, 1);
269 atomic_set(&new->openers
, 0);
270 spin_lock_init(&new->write_lock
);
271 init_waitqueue_head(&new->sb_wait
);
272 init_waitqueue_head(&new->recovery_wait
);
273 new->reshape_position
= MaxSector
;
275 new->resync_max
= MaxSector
;
276 new->level
= LEVEL_NONE
;
278 new->queue
= blk_alloc_queue(GFP_KERNEL
);
283 /* Can be unlocked because the queue is new: no concurrency */
284 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, new->queue
);
286 blk_queue_make_request(new->queue
, md_fail_request
);
291 static inline int mddev_lock(mddev_t
* mddev
)
293 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
296 static inline int mddev_trylock(mddev_t
* mddev
)
298 return mutex_trylock(&mddev
->reconfig_mutex
);
301 static inline void mddev_unlock(mddev_t
* mddev
)
303 mutex_unlock(&mddev
->reconfig_mutex
);
305 md_wakeup_thread(mddev
->thread
);
308 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
312 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
313 if (rdev
->desc_nr
== nr
)
319 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
323 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
324 if (rdev
->bdev
->bd_dev
== dev
)
330 static struct mdk_personality
*find_pers(int level
, char *clevel
)
332 struct mdk_personality
*pers
;
333 list_for_each_entry(pers
, &pers_list
, list
) {
334 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
336 if (strcmp(pers
->name
, clevel
)==0)
342 /* return the offset of the super block in 512byte sectors */
343 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
345 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
346 return MD_NEW_SIZE_SECTORS(num_sectors
);
349 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
351 sector_t num_sectors
= rdev
->sb_start
;
354 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
358 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
363 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
364 if (!rdev
->sb_page
) {
365 printk(KERN_ALERT
"md: out of memory.\n");
372 static void free_disk_sb(mdk_rdev_t
* rdev
)
375 put_page(rdev
->sb_page
);
377 rdev
->sb_page
= NULL
;
384 static void super_written(struct bio
*bio
, int error
)
386 mdk_rdev_t
*rdev
= bio
->bi_private
;
387 mddev_t
*mddev
= rdev
->mddev
;
389 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
390 printk("md: super_written gets error=%d, uptodate=%d\n",
391 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
392 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
393 md_error(mddev
, rdev
);
396 if (atomic_dec_and_test(&mddev
->pending_writes
))
397 wake_up(&mddev
->sb_wait
);
401 static void super_written_barrier(struct bio
*bio
, int error
)
403 struct bio
*bio2
= bio
->bi_private
;
404 mdk_rdev_t
*rdev
= bio2
->bi_private
;
405 mddev_t
*mddev
= rdev
->mddev
;
407 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
408 error
== -EOPNOTSUPP
) {
410 /* barriers don't appear to be supported :-( */
411 set_bit(BarriersNotsupp
, &rdev
->flags
);
412 mddev
->barriers_work
= 0;
413 spin_lock_irqsave(&mddev
->write_lock
, flags
);
414 bio2
->bi_next
= mddev
->biolist
;
415 mddev
->biolist
= bio2
;
416 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
417 wake_up(&mddev
->sb_wait
);
421 bio
->bi_private
= rdev
;
422 super_written(bio
, error
);
426 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
427 sector_t sector
, int size
, struct page
*page
)
429 /* write first size bytes of page to sector of rdev
430 * Increment mddev->pending_writes before returning
431 * and decrement it on completion, waking up sb_wait
432 * if zero is reached.
433 * If an error occurred, call md_error
435 * As we might need to resubmit the request if BIO_RW_BARRIER
436 * causes ENOTSUPP, we allocate a spare bio...
438 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
439 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
441 bio
->bi_bdev
= rdev
->bdev
;
442 bio
->bi_sector
= sector
;
443 bio_add_page(bio
, page
, size
, 0);
444 bio
->bi_private
= rdev
;
445 bio
->bi_end_io
= super_written
;
448 atomic_inc(&mddev
->pending_writes
);
449 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
451 rw
|= (1<<BIO_RW_BARRIER
);
452 rbio
= bio_clone(bio
, GFP_NOIO
);
453 rbio
->bi_private
= bio
;
454 rbio
->bi_end_io
= super_written_barrier
;
455 submit_bio(rw
, rbio
);
460 void md_super_wait(mddev_t
*mddev
)
462 /* wait for all superblock writes that were scheduled to complete.
463 * if any had to be retried (due to BARRIER problems), retry them
467 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
468 if (atomic_read(&mddev
->pending_writes
)==0)
470 while (mddev
->biolist
) {
472 spin_lock_irq(&mddev
->write_lock
);
473 bio
= mddev
->biolist
;
474 mddev
->biolist
= bio
->bi_next
;
476 spin_unlock_irq(&mddev
->write_lock
);
477 submit_bio(bio
->bi_rw
, bio
);
481 finish_wait(&mddev
->sb_wait
, &wq
);
484 static void bi_complete(struct bio
*bio
, int error
)
486 complete((struct completion
*)bio
->bi_private
);
489 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
490 struct page
*page
, int rw
)
492 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
493 struct completion event
;
496 rw
|= (1 << BIO_RW_SYNC
);
499 bio
->bi_sector
= sector
;
500 bio_add_page(bio
, page
, size
, 0);
501 init_completion(&event
);
502 bio
->bi_private
= &event
;
503 bio
->bi_end_io
= bi_complete
;
505 wait_for_completion(&event
);
507 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
511 EXPORT_SYMBOL_GPL(sync_page_io
);
513 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
515 char b
[BDEVNAME_SIZE
];
516 if (!rdev
->sb_page
) {
524 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
530 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
531 bdevname(rdev
->bdev
,b
));
535 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
537 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
538 sb1
->set_uuid1
== sb2
->set_uuid1
&&
539 sb1
->set_uuid2
== sb2
->set_uuid2
&&
540 sb1
->set_uuid3
== sb2
->set_uuid3
;
543 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
546 mdp_super_t
*tmp1
, *tmp2
;
548 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
549 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
551 if (!tmp1
|| !tmp2
) {
553 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
561 * nr_disks is not constant
566 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
574 static u32
md_csum_fold(u32 csum
)
576 csum
= (csum
& 0xffff) + (csum
>> 16);
577 return (csum
& 0xffff) + (csum
>> 16);
580 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
583 u32
*sb32
= (u32
*)sb
;
585 unsigned int disk_csum
, csum
;
587 disk_csum
= sb
->sb_csum
;
590 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
592 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
596 /* This used to use csum_partial, which was wrong for several
597 * reasons including that different results are returned on
598 * different architectures. It isn't critical that we get exactly
599 * the same return value as before (we always csum_fold before
600 * testing, and that removes any differences). However as we
601 * know that csum_partial always returned a 16bit value on
602 * alphas, do a fold to maximise conformity to previous behaviour.
604 sb
->sb_csum
= md_csum_fold(disk_csum
);
606 sb
->sb_csum
= disk_csum
;
613 * Handle superblock details.
614 * We want to be able to handle multiple superblock formats
615 * so we have a common interface to them all, and an array of
616 * different handlers.
617 * We rely on user-space to write the initial superblock, and support
618 * reading and updating of superblocks.
619 * Interface methods are:
620 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
621 * loads and validates a superblock on dev.
622 * if refdev != NULL, compare superblocks on both devices
624 * 0 - dev has a superblock that is compatible with refdev
625 * 1 - dev has a superblock that is compatible and newer than refdev
626 * so dev should be used as the refdev in future
627 * -EINVAL superblock incompatible or invalid
628 * -othererror e.g. -EIO
630 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
631 * Verify that dev is acceptable into mddev.
632 * The first time, mddev->raid_disks will be 0, and data from
633 * dev should be merged in. Subsequent calls check that dev
634 * is new enough. Return 0 or -EINVAL
636 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
637 * Update the superblock for rdev with data in mddev
638 * This does not write to disc.
644 struct module
*owner
;
645 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
647 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
648 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
649 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
650 sector_t num_sectors
);
654 * load_super for 0.90.0
656 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
658 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
663 * Calculate the position of the superblock (512byte sectors),
664 * it's at the end of the disk.
666 * It also happens to be a multiple of 4Kb.
668 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
670 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
675 bdevname(rdev
->bdev
, b
);
676 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
678 if (sb
->md_magic
!= MD_SB_MAGIC
) {
679 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
684 if (sb
->major_version
!= 0 ||
685 sb
->minor_version
< 90 ||
686 sb
->minor_version
> 91) {
687 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
688 sb
->major_version
, sb
->minor_version
,
693 if (sb
->raid_disks
<= 0)
696 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
697 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
702 rdev
->preferred_minor
= sb
->md_minor
;
703 rdev
->data_offset
= 0;
704 rdev
->sb_size
= MD_SB_BYTES
;
706 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
707 if (sb
->level
!= 1 && sb
->level
!= 4
708 && sb
->level
!= 5 && sb
->level
!= 6
709 && sb
->level
!= 10) {
710 /* FIXME use a better test */
712 "md: bitmaps not supported for this level.\n");
717 if (sb
->level
== LEVEL_MULTIPATH
)
720 rdev
->desc_nr
= sb
->this_disk
.number
;
726 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
727 if (!uuid_equal(refsb
, sb
)) {
728 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
729 b
, bdevname(refdev
->bdev
,b2
));
732 if (!sb_equal(refsb
, sb
)) {
733 printk(KERN_WARNING
"md: %s has same UUID"
734 " but different superblock to %s\n",
735 b
, bdevname(refdev
->bdev
, b2
));
739 ev2
= md_event(refsb
);
745 rdev
->size
= calc_num_sectors(rdev
, sb
->chunk_size
) / 2;
747 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
748 /* "this cannot possibly happen" ... */
756 * validate_super for 0.90.0
758 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
761 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
762 __u64 ev1
= md_event(sb
);
764 rdev
->raid_disk
= -1;
765 clear_bit(Faulty
, &rdev
->flags
);
766 clear_bit(In_sync
, &rdev
->flags
);
767 clear_bit(WriteMostly
, &rdev
->flags
);
768 clear_bit(BarriersNotsupp
, &rdev
->flags
);
770 if (mddev
->raid_disks
== 0) {
771 mddev
->major_version
= 0;
772 mddev
->minor_version
= sb
->minor_version
;
773 mddev
->patch_version
= sb
->patch_version
;
775 mddev
->chunk_size
= sb
->chunk_size
;
776 mddev
->ctime
= sb
->ctime
;
777 mddev
->utime
= sb
->utime
;
778 mddev
->level
= sb
->level
;
779 mddev
->clevel
[0] = 0;
780 mddev
->layout
= sb
->layout
;
781 mddev
->raid_disks
= sb
->raid_disks
;
782 mddev
->size
= sb
->size
;
784 mddev
->bitmap_offset
= 0;
785 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
787 if (mddev
->minor_version
>= 91) {
788 mddev
->reshape_position
= sb
->reshape_position
;
789 mddev
->delta_disks
= sb
->delta_disks
;
790 mddev
->new_level
= sb
->new_level
;
791 mddev
->new_layout
= sb
->new_layout
;
792 mddev
->new_chunk
= sb
->new_chunk
;
794 mddev
->reshape_position
= MaxSector
;
795 mddev
->delta_disks
= 0;
796 mddev
->new_level
= mddev
->level
;
797 mddev
->new_layout
= mddev
->layout
;
798 mddev
->new_chunk
= mddev
->chunk_size
;
801 if (sb
->state
& (1<<MD_SB_CLEAN
))
802 mddev
->recovery_cp
= MaxSector
;
804 if (sb
->events_hi
== sb
->cp_events_hi
&&
805 sb
->events_lo
== sb
->cp_events_lo
) {
806 mddev
->recovery_cp
= sb
->recovery_cp
;
808 mddev
->recovery_cp
= 0;
811 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
812 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
813 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
814 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
816 mddev
->max_disks
= MD_SB_DISKS
;
818 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
819 mddev
->bitmap_file
== NULL
)
820 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
822 } else if (mddev
->pers
== NULL
) {
823 /* Insist on good event counter while assembling */
825 if (ev1
< mddev
->events
)
827 } else if (mddev
->bitmap
) {
828 /* if adding to array with a bitmap, then we can accept an
829 * older device ... but not too old.
831 if (ev1
< mddev
->bitmap
->events_cleared
)
834 if (ev1
< mddev
->events
)
835 /* just a hot-add of a new device, leave raid_disk at -1 */
839 if (mddev
->level
!= LEVEL_MULTIPATH
) {
840 desc
= sb
->disks
+ rdev
->desc_nr
;
842 if (desc
->state
& (1<<MD_DISK_FAULTY
))
843 set_bit(Faulty
, &rdev
->flags
);
844 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
845 desc->raid_disk < mddev->raid_disks */) {
846 set_bit(In_sync
, &rdev
->flags
);
847 rdev
->raid_disk
= desc
->raid_disk
;
849 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
850 set_bit(WriteMostly
, &rdev
->flags
);
851 } else /* MULTIPATH are always insync */
852 set_bit(In_sync
, &rdev
->flags
);
857 * sync_super for 0.90.0
859 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
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 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
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
;
1261 /* make rdev->sb match mddev and rdev data. */
1263 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1265 sb
->feature_map
= 0;
1267 sb
->recovery_offset
= cpu_to_le64(0);
1268 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1269 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1270 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1272 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1273 sb
->events
= cpu_to_le64(mddev
->events
);
1275 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1277 sb
->resync_offset
= cpu_to_le64(0);
1279 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1281 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1282 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1284 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1285 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1286 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1289 if (rdev
->raid_disk
>= 0 &&
1290 !test_bit(In_sync
, &rdev
->flags
) &&
1291 rdev
->recovery_offset
> 0) {
1292 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1293 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1296 if (mddev
->reshape_position
!= MaxSector
) {
1297 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1298 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1299 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1300 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1301 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1302 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1306 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1307 if (rdev2
->desc_nr
+1 > max_dev
)
1308 max_dev
= rdev2
->desc_nr
+1;
1310 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1311 sb
->max_dev
= cpu_to_le32(max_dev
);
1312 for (i
=0; i
<max_dev
;i
++)
1313 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1315 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1317 if (test_bit(Faulty
, &rdev2
->flags
))
1318 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1319 else if (test_bit(In_sync
, &rdev2
->flags
))
1320 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1321 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1322 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1324 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1327 sb
->sb_csum
= calc_sb_1_csum(sb
);
1330 static unsigned long long
1331 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1333 struct mdp_superblock_1
*sb
;
1334 sector_t max_sectors
;
1335 if (num_sectors
&& num_sectors
< rdev
->mddev
->size
* 2)
1336 return 0; /* component must fit device */
1337 if (rdev
->sb_start
< rdev
->data_offset
) {
1338 /* minor versions 1 and 2; superblock before data */
1339 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1340 max_sectors
-= rdev
->data_offset
;
1341 if (!num_sectors
|| num_sectors
> max_sectors
)
1342 num_sectors
= max_sectors
;
1343 } else if (rdev
->mddev
->bitmap_offset
) {
1344 /* minor version 0 with bitmap we can't move */
1347 /* minor version 0; superblock after data */
1349 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1350 sb_start
&= ~(sector_t
)(4*2 - 1);
1351 max_sectors
= rdev
->size
* 2 + sb_start
- rdev
->sb_start
;
1352 if (!num_sectors
|| num_sectors
> max_sectors
)
1353 num_sectors
= max_sectors
;
1354 rdev
->sb_start
= sb_start
;
1356 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1357 sb
->data_size
= cpu_to_le64(num_sectors
);
1358 sb
->super_offset
= rdev
->sb_start
;
1359 sb
->sb_csum
= calc_sb_1_csum(sb
);
1360 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1362 md_super_wait(rdev
->mddev
);
1363 return num_sectors
/ 2; /* kB for sysfs */
1366 static struct super_type super_types
[] = {
1369 .owner
= THIS_MODULE
,
1370 .load_super
= super_90_load
,
1371 .validate_super
= super_90_validate
,
1372 .sync_super
= super_90_sync
,
1373 .rdev_size_change
= super_90_rdev_size_change
,
1377 .owner
= THIS_MODULE
,
1378 .load_super
= super_1_load
,
1379 .validate_super
= super_1_validate
,
1380 .sync_super
= super_1_sync
,
1381 .rdev_size_change
= super_1_rdev_size_change
,
1385 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1387 mdk_rdev_t
*rdev
, *rdev2
;
1390 rdev_for_each_rcu(rdev
, mddev1
)
1391 rdev_for_each_rcu(rdev2
, mddev2
)
1392 if (rdev
->bdev
->bd_contains
==
1393 rdev2
->bdev
->bd_contains
) {
1401 static LIST_HEAD(pending_raid_disks
);
1403 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1405 char b
[BDEVNAME_SIZE
];
1415 /* prevent duplicates */
1416 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1419 /* make sure rdev->size exceeds mddev->size */
1420 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1422 /* Cannot change size, so fail
1423 * If mddev->level <= 0, then we don't care
1424 * about aligning sizes (e.g. linear)
1426 if (mddev
->level
> 0)
1429 mddev
->size
= rdev
->size
;
1432 /* Verify rdev->desc_nr is unique.
1433 * If it is -1, assign a free number, else
1434 * check number is not in use
1436 if (rdev
->desc_nr
< 0) {
1438 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1439 while (find_rdev_nr(mddev
, choice
))
1441 rdev
->desc_nr
= choice
;
1443 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1446 bdevname(rdev
->bdev
,b
);
1447 while ( (s
=strchr(b
, '/')) != NULL
)
1450 rdev
->mddev
= mddev
;
1451 printk(KERN_INFO
"md: bind<%s>\n", b
);
1453 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1456 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1457 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1458 kobject_del(&rdev
->kobj
);
1461 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1463 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1464 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1468 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1473 static void md_delayed_delete(struct work_struct
*ws
)
1475 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1476 kobject_del(&rdev
->kobj
);
1477 kobject_put(&rdev
->kobj
);
1480 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1482 char b
[BDEVNAME_SIZE
];
1487 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1488 list_del_rcu(&rdev
->same_set
);
1489 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1491 sysfs_remove_link(&rdev
->kobj
, "block");
1492 sysfs_put(rdev
->sysfs_state
);
1493 rdev
->sysfs_state
= NULL
;
1494 /* We need to delay this, otherwise we can deadlock when
1495 * writing to 'remove' to "dev/state". We also need
1496 * to delay it due to rcu usage.
1499 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1500 kobject_get(&rdev
->kobj
);
1501 schedule_work(&rdev
->del_work
);
1505 * prevent the device from being mounted, repartitioned or
1506 * otherwise reused by a RAID array (or any other kernel
1507 * subsystem), by bd_claiming the device.
1509 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1512 struct block_device
*bdev
;
1513 char b
[BDEVNAME_SIZE
];
1515 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1517 printk(KERN_ERR
"md: could not open %s.\n",
1518 __bdevname(dev
, b
));
1519 return PTR_ERR(bdev
);
1521 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1523 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1525 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1529 set_bit(AllReserved
, &rdev
->flags
);
1534 static void unlock_rdev(mdk_rdev_t
*rdev
)
1536 struct block_device
*bdev
= rdev
->bdev
;
1541 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1544 void md_autodetect_dev(dev_t dev
);
1546 static void export_rdev(mdk_rdev_t
* rdev
)
1548 char b
[BDEVNAME_SIZE
];
1549 printk(KERN_INFO
"md: export_rdev(%s)\n",
1550 bdevname(rdev
->bdev
,b
));
1555 if (test_bit(AutoDetected
, &rdev
->flags
))
1556 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1559 kobject_put(&rdev
->kobj
);
1562 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1564 unbind_rdev_from_array(rdev
);
1568 static void export_array(mddev_t
*mddev
)
1570 mdk_rdev_t
*rdev
, *tmp
;
1572 rdev_for_each(rdev
, tmp
, mddev
) {
1577 kick_rdev_from_array(rdev
);
1579 if (!list_empty(&mddev
->disks
))
1581 mddev
->raid_disks
= 0;
1582 mddev
->major_version
= 0;
1585 static void print_desc(mdp_disk_t
*desc
)
1587 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1588 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1591 static void print_sb_90(mdp_super_t
*sb
)
1596 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1597 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1598 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1600 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1601 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1602 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1603 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1604 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1605 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1606 sb
->failed_disks
, sb
->spare_disks
,
1607 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1610 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1613 desc
= sb
->disks
+ i
;
1614 if (desc
->number
|| desc
->major
|| desc
->minor
||
1615 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1616 printk(" D %2d: ", i
);
1620 printk(KERN_INFO
"md: THIS: ");
1621 print_desc(&sb
->this_disk
);
1624 static void print_sb_1(struct mdp_superblock_1
*sb
)
1628 uuid
= sb
->set_uuid
;
1629 printk(KERN_INFO
"md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1630 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1631 KERN_INFO
"md: Name: \"%s\" CT:%llu\n",
1632 le32_to_cpu(sb
->major_version
),
1633 le32_to_cpu(sb
->feature_map
),
1634 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1635 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1636 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1637 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1639 (unsigned long long)le64_to_cpu(sb
->ctime
)
1640 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1642 uuid
= sb
->device_uuid
;
1643 printk(KERN_INFO
"md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1645 KERN_INFO
"md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1646 ":%02x%02x%02x%02x%02x%02x\n"
1647 KERN_INFO
"md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1648 KERN_INFO
"md: (MaxDev:%u) \n",
1649 le32_to_cpu(sb
->level
),
1650 (unsigned long long)le64_to_cpu(sb
->size
),
1651 le32_to_cpu(sb
->raid_disks
),
1652 le32_to_cpu(sb
->layout
),
1653 le32_to_cpu(sb
->chunksize
),
1654 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1655 (unsigned long long)le64_to_cpu(sb
->data_size
),
1656 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1657 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1658 le32_to_cpu(sb
->dev_number
),
1659 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1660 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1661 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1662 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1664 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1665 (unsigned long long)le64_to_cpu(sb
->events
),
1666 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1667 le32_to_cpu(sb
->sb_csum
),
1668 le32_to_cpu(sb
->max_dev
)
1672 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1674 char b
[BDEVNAME_SIZE
];
1675 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1676 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1677 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1679 if (rdev
->sb_loaded
) {
1680 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1681 switch (major_version
) {
1683 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1686 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
1690 printk(KERN_INFO
"md: no rdev superblock!\n");
1693 static void md_print_devices(void)
1695 struct list_head
*tmp
;
1698 char b
[BDEVNAME_SIZE
];
1701 printk("md: **********************************\n");
1702 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1703 printk("md: **********************************\n");
1704 for_each_mddev(mddev
, tmp
) {
1707 bitmap_print_sb(mddev
->bitmap
);
1709 printk("%s: ", mdname(mddev
));
1710 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1711 printk("<%s>", bdevname(rdev
->bdev
,b
));
1714 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1715 print_rdev(rdev
, mddev
->major_version
);
1717 printk("md: **********************************\n");
1722 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1724 /* Update each superblock (in-memory image), but
1725 * if we are allowed to, skip spares which already
1726 * have the right event counter, or have one earlier
1727 * (which would mean they aren't being marked as dirty
1728 * with the rest of the array)
1732 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1733 if (rdev
->sb_events
== mddev
->events
||
1735 rdev
->raid_disk
< 0 &&
1736 (rdev
->sb_events
&1)==0 &&
1737 rdev
->sb_events
+1 == mddev
->events
)) {
1738 /* Don't update this superblock */
1739 rdev
->sb_loaded
= 2;
1741 super_types
[mddev
->major_version
].
1742 sync_super(mddev
, rdev
);
1743 rdev
->sb_loaded
= 1;
1748 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1754 if (mddev
->external
)
1757 spin_lock_irq(&mddev
->write_lock
);
1759 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1760 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1762 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1763 /* just a clean<-> dirty transition, possibly leave spares alone,
1764 * though if events isn't the right even/odd, we will have to do
1770 if (mddev
->degraded
)
1771 /* If the array is degraded, then skipping spares is both
1772 * dangerous and fairly pointless.
1773 * Dangerous because a device that was removed from the array
1774 * might have a event_count that still looks up-to-date,
1775 * so it can be re-added without a resync.
1776 * Pointless because if there are any spares to skip,
1777 * then a recovery will happen and soon that array won't
1778 * be degraded any more and the spare can go back to sleep then.
1782 sync_req
= mddev
->in_sync
;
1783 mddev
->utime
= get_seconds();
1785 /* If this is just a dirty<->clean transition, and the array is clean
1786 * and 'events' is odd, we can roll back to the previous clean state */
1788 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1789 && (mddev
->events
& 1)
1790 && mddev
->events
!= 1)
1793 /* otherwise we have to go forward and ... */
1795 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1796 /* .. if the array isn't clean, insist on an odd 'events' */
1797 if ((mddev
->events
&1)==0) {
1802 /* otherwise insist on an even 'events' (for clean states) */
1803 if ((mddev
->events
&1)) {
1810 if (!mddev
->events
) {
1812 * oops, this 64-bit counter should never wrap.
1813 * Either we are in around ~1 trillion A.C., assuming
1814 * 1 reboot per second, or we have a bug:
1821 * do not write anything to disk if using
1822 * nonpersistent superblocks
1824 if (!mddev
->persistent
) {
1825 if (!mddev
->external
)
1826 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1828 spin_unlock_irq(&mddev
->write_lock
);
1829 wake_up(&mddev
->sb_wait
);
1832 sync_sbs(mddev
, nospares
);
1833 spin_unlock_irq(&mddev
->write_lock
);
1836 "md: updating %s RAID superblock on device (in sync %d)\n",
1837 mdname(mddev
),mddev
->in_sync
);
1839 bitmap_update_sb(mddev
->bitmap
);
1840 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1841 char b
[BDEVNAME_SIZE
];
1842 dprintk(KERN_INFO
"md: ");
1843 if (rdev
->sb_loaded
!= 1)
1844 continue; /* no noise on spare devices */
1845 if (test_bit(Faulty
, &rdev
->flags
))
1846 dprintk("(skipping faulty ");
1848 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1849 if (!test_bit(Faulty
, &rdev
->flags
)) {
1850 md_super_write(mddev
,rdev
,
1851 rdev
->sb_start
, rdev
->sb_size
,
1853 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1854 bdevname(rdev
->bdev
,b
),
1855 (unsigned long long)rdev
->sb_start
);
1856 rdev
->sb_events
= mddev
->events
;
1860 if (mddev
->level
== LEVEL_MULTIPATH
)
1861 /* only need to write one superblock... */
1864 md_super_wait(mddev
);
1865 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1867 spin_lock_irq(&mddev
->write_lock
);
1868 if (mddev
->in_sync
!= sync_req
||
1869 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1870 /* have to write it out again */
1871 spin_unlock_irq(&mddev
->write_lock
);
1874 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1875 spin_unlock_irq(&mddev
->write_lock
);
1876 wake_up(&mddev
->sb_wait
);
1880 /* words written to sysfs files may, or may not, be \n terminated.
1881 * We want to accept with case. For this we use cmd_match.
1883 static int cmd_match(const char *cmd
, const char *str
)
1885 /* See if cmd, written into a sysfs file, matches
1886 * str. They must either be the same, or cmd can
1887 * have a trailing newline
1889 while (*cmd
&& *str
&& *cmd
== *str
) {
1900 struct rdev_sysfs_entry
{
1901 struct attribute attr
;
1902 ssize_t (*show
)(mdk_rdev_t
*, char *);
1903 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1907 state_show(mdk_rdev_t
*rdev
, char *page
)
1912 if (test_bit(Faulty
, &rdev
->flags
)) {
1913 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1916 if (test_bit(In_sync
, &rdev
->flags
)) {
1917 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1920 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1921 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1924 if (test_bit(Blocked
, &rdev
->flags
)) {
1925 len
+= sprintf(page
+len
, "%sblocked", sep
);
1928 if (!test_bit(Faulty
, &rdev
->flags
) &&
1929 !test_bit(In_sync
, &rdev
->flags
)) {
1930 len
+= sprintf(page
+len
, "%sspare", sep
);
1933 return len
+sprintf(page
+len
, "\n");
1937 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1940 * faulty - simulates and error
1941 * remove - disconnects the device
1942 * writemostly - sets write_mostly
1943 * -writemostly - clears write_mostly
1944 * blocked - sets the Blocked flag
1945 * -blocked - clears the Blocked flag
1948 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1949 md_error(rdev
->mddev
, rdev
);
1951 } else if (cmd_match(buf
, "remove")) {
1952 if (rdev
->raid_disk
>= 0)
1955 mddev_t
*mddev
= rdev
->mddev
;
1956 kick_rdev_from_array(rdev
);
1958 md_update_sb(mddev
, 1);
1959 md_new_event(mddev
);
1962 } else if (cmd_match(buf
, "writemostly")) {
1963 set_bit(WriteMostly
, &rdev
->flags
);
1965 } else if (cmd_match(buf
, "-writemostly")) {
1966 clear_bit(WriteMostly
, &rdev
->flags
);
1968 } else if (cmd_match(buf
, "blocked")) {
1969 set_bit(Blocked
, &rdev
->flags
);
1971 } else if (cmd_match(buf
, "-blocked")) {
1972 clear_bit(Blocked
, &rdev
->flags
);
1973 wake_up(&rdev
->blocked_wait
);
1974 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1975 md_wakeup_thread(rdev
->mddev
->thread
);
1979 if (!err
&& rdev
->sysfs_state
)
1980 sysfs_notify_dirent(rdev
->sysfs_state
);
1981 return err
? err
: len
;
1983 static struct rdev_sysfs_entry rdev_state
=
1984 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1987 errors_show(mdk_rdev_t
*rdev
, char *page
)
1989 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1993 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1996 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1997 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1998 atomic_set(&rdev
->corrected_errors
, n
);
2003 static struct rdev_sysfs_entry rdev_errors
=
2004 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2007 slot_show(mdk_rdev_t
*rdev
, char *page
)
2009 if (rdev
->raid_disk
< 0)
2010 return sprintf(page
, "none\n");
2012 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2016 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2021 int slot
= simple_strtoul(buf
, &e
, 10);
2022 if (strncmp(buf
, "none", 4)==0)
2024 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2026 if (rdev
->mddev
->pers
&& slot
== -1) {
2027 /* Setting 'slot' on an active array requires also
2028 * updating the 'rd%d' link, and communicating
2029 * with the personality with ->hot_*_disk.
2030 * For now we only support removing
2031 * failed/spare devices. This normally happens automatically,
2032 * but not when the metadata is externally managed.
2034 if (rdev
->raid_disk
== -1)
2036 /* personality does all needed checks */
2037 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2039 err
= rdev
->mddev
->pers
->
2040 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2043 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2044 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2045 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2046 md_wakeup_thread(rdev
->mddev
->thread
);
2047 } else if (rdev
->mddev
->pers
) {
2049 /* Activating a spare .. or possibly reactivating
2050 * if we every get bitmaps working here.
2053 if (rdev
->raid_disk
!= -1)
2056 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2059 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2060 if (rdev2
->raid_disk
== slot
)
2063 rdev
->raid_disk
= slot
;
2064 if (test_bit(In_sync
, &rdev
->flags
))
2065 rdev
->saved_raid_disk
= slot
;
2067 rdev
->saved_raid_disk
= -1;
2068 err
= rdev
->mddev
->pers
->
2069 hot_add_disk(rdev
->mddev
, rdev
);
2071 rdev
->raid_disk
= -1;
2074 sysfs_notify_dirent(rdev
->sysfs_state
);
2075 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2076 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2078 "md: cannot register "
2080 nm
, mdname(rdev
->mddev
));
2082 /* don't wakeup anyone, leave that to userspace. */
2084 if (slot
>= rdev
->mddev
->raid_disks
)
2086 rdev
->raid_disk
= slot
;
2087 /* assume it is working */
2088 clear_bit(Faulty
, &rdev
->flags
);
2089 clear_bit(WriteMostly
, &rdev
->flags
);
2090 set_bit(In_sync
, &rdev
->flags
);
2091 sysfs_notify_dirent(rdev
->sysfs_state
);
2097 static struct rdev_sysfs_entry rdev_slot
=
2098 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2101 offset_show(mdk_rdev_t
*rdev
, char *page
)
2103 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2107 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2110 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2111 if (e
==buf
|| (*e
&& *e
!= '\n'))
2113 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2115 if (rdev
->size
&& rdev
->mddev
->external
)
2116 /* Must set offset before size, so overlap checks
2119 rdev
->data_offset
= offset
;
2123 static struct rdev_sysfs_entry rdev_offset
=
2124 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2127 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2129 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
2132 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2134 /* check if two start/length pairs overlap */
2143 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2145 unsigned long long size
;
2146 unsigned long long oldsize
= rdev
->size
;
2147 mddev_t
*my_mddev
= rdev
->mddev
;
2149 if (strict_strtoull(buf
, 10, &size
) < 0)
2151 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2152 if (my_mddev
->persistent
) {
2153 size
= super_types
[my_mddev
->major_version
].
2154 rdev_size_change(rdev
, size
* 2);
2158 size
= (rdev
->bdev
->bd_inode
->i_size
>> 10);
2159 size
-= rdev
->data_offset
/2;
2162 if (size
< my_mddev
->size
)
2163 return -EINVAL
; /* component must fit device */
2166 if (size
> oldsize
&& my_mddev
->external
) {
2167 /* need to check that all other rdevs with the same ->bdev
2168 * do not overlap. We need to unlock the mddev to avoid
2169 * a deadlock. We have already changed rdev->size, and if
2170 * we have to change it back, we will have the lock again.
2174 struct list_head
*tmp
;
2176 mddev_unlock(my_mddev
);
2177 for_each_mddev(mddev
, tmp
) {
2181 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2182 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2183 (rdev
->bdev
== rdev2
->bdev
&&
2185 overlaps(rdev
->data_offset
, rdev
->size
* 2,
2187 rdev2
->size
* 2))) {
2191 mddev_unlock(mddev
);
2197 mddev_lock(my_mddev
);
2199 /* Someone else could have slipped in a size
2200 * change here, but doing so is just silly.
2201 * We put oldsize back because we *know* it is
2202 * safe, and trust userspace not to race with
2205 rdev
->size
= oldsize
;
2212 static struct rdev_sysfs_entry rdev_size
=
2213 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2215 static struct attribute
*rdev_default_attrs
[] = {
2224 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2226 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2227 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2228 mddev_t
*mddev
= rdev
->mddev
;
2234 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2236 if (rdev
->mddev
== NULL
)
2239 rv
= entry
->show(rdev
, page
);
2240 mddev_unlock(mddev
);
2246 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2247 const char *page
, size_t length
)
2249 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2250 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2252 mddev_t
*mddev
= rdev
->mddev
;
2256 if (!capable(CAP_SYS_ADMIN
))
2258 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2260 if (rdev
->mddev
== NULL
)
2263 rv
= entry
->store(rdev
, page
, length
);
2264 mddev_unlock(mddev
);
2269 static void rdev_free(struct kobject
*ko
)
2271 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2274 static struct sysfs_ops rdev_sysfs_ops
= {
2275 .show
= rdev_attr_show
,
2276 .store
= rdev_attr_store
,
2278 static struct kobj_type rdev_ktype
= {
2279 .release
= rdev_free
,
2280 .sysfs_ops
= &rdev_sysfs_ops
,
2281 .default_attrs
= rdev_default_attrs
,
2285 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2287 * mark the device faulty if:
2289 * - the device is nonexistent (zero size)
2290 * - the device has no valid superblock
2292 * a faulty rdev _never_ has rdev->sb set.
2294 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2296 char b
[BDEVNAME_SIZE
];
2301 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2303 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2304 return ERR_PTR(-ENOMEM
);
2307 if ((err
= alloc_disk_sb(rdev
)))
2310 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2314 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2317 rdev
->saved_raid_disk
= -1;
2318 rdev
->raid_disk
= -1;
2320 rdev
->data_offset
= 0;
2321 rdev
->sb_events
= 0;
2322 atomic_set(&rdev
->nr_pending
, 0);
2323 atomic_set(&rdev
->read_errors
, 0);
2324 atomic_set(&rdev
->corrected_errors
, 0);
2326 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2329 "md: %s has zero or unknown size, marking faulty!\n",
2330 bdevname(rdev
->bdev
,b
));
2335 if (super_format
>= 0) {
2336 err
= super_types
[super_format
].
2337 load_super(rdev
, NULL
, super_minor
);
2338 if (err
== -EINVAL
) {
2340 "md: %s does not have a valid v%d.%d "
2341 "superblock, not importing!\n",
2342 bdevname(rdev
->bdev
,b
),
2343 super_format
, super_minor
);
2348 "md: could not read %s's sb, not importing!\n",
2349 bdevname(rdev
->bdev
,b
));
2354 INIT_LIST_HEAD(&rdev
->same_set
);
2355 init_waitqueue_head(&rdev
->blocked_wait
);
2360 if (rdev
->sb_page
) {
2366 return ERR_PTR(err
);
2370 * Check a full RAID array for plausibility
2374 static void analyze_sbs(mddev_t
* mddev
)
2377 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2378 char b
[BDEVNAME_SIZE
];
2381 rdev_for_each(rdev
, tmp
, mddev
)
2382 switch (super_types
[mddev
->major_version
].
2383 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2391 "md: fatal superblock inconsistency in %s"
2392 " -- removing from array\n",
2393 bdevname(rdev
->bdev
,b
));
2394 kick_rdev_from_array(rdev
);
2398 super_types
[mddev
->major_version
].
2399 validate_super(mddev
, freshest
);
2402 rdev_for_each(rdev
, tmp
, mddev
) {
2403 if (rdev
!= freshest
)
2404 if (super_types
[mddev
->major_version
].
2405 validate_super(mddev
, rdev
)) {
2406 printk(KERN_WARNING
"md: kicking non-fresh %s"
2408 bdevname(rdev
->bdev
,b
));
2409 kick_rdev_from_array(rdev
);
2412 if (mddev
->level
== LEVEL_MULTIPATH
) {
2413 rdev
->desc_nr
= i
++;
2414 rdev
->raid_disk
= rdev
->desc_nr
;
2415 set_bit(In_sync
, &rdev
->flags
);
2416 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2417 rdev
->raid_disk
= -1;
2418 clear_bit(In_sync
, &rdev
->flags
);
2424 if (mddev
->recovery_cp
!= MaxSector
&&
2426 printk(KERN_ERR
"md: %s: raid array is not clean"
2427 " -- starting background reconstruction\n",
2432 static void md_safemode_timeout(unsigned long data
);
2435 safe_delay_show(mddev_t
*mddev
, char *page
)
2437 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2438 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2441 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2449 /* remove a period, and count digits after it */
2450 if (len
>= sizeof(buf
))
2452 strlcpy(buf
, cbuf
, sizeof(buf
));
2453 for (i
=0; i
<len
; i
++) {
2455 if (isdigit(buf
[i
])) {
2460 } else if (buf
[i
] == '.') {
2465 if (strict_strtoul(buf
, 10, &msec
) < 0)
2467 msec
= (msec
* 1000) / scale
;
2469 mddev
->safemode_delay
= 0;
2471 unsigned long old_delay
= mddev
->safemode_delay
;
2472 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2473 if (mddev
->safemode_delay
== 0)
2474 mddev
->safemode_delay
= 1;
2475 if (mddev
->safemode_delay
< old_delay
)
2476 md_safemode_timeout((unsigned long)mddev
);
2480 static struct md_sysfs_entry md_safe_delay
=
2481 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2484 level_show(mddev_t
*mddev
, char *page
)
2486 struct mdk_personality
*p
= mddev
->pers
;
2488 return sprintf(page
, "%s\n", p
->name
);
2489 else if (mddev
->clevel
[0])
2490 return sprintf(page
, "%s\n", mddev
->clevel
);
2491 else if (mddev
->level
!= LEVEL_NONE
)
2492 return sprintf(page
, "%d\n", mddev
->level
);
2498 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2505 if (len
>= sizeof(mddev
->clevel
))
2507 strncpy(mddev
->clevel
, buf
, len
);
2508 if (mddev
->clevel
[len
-1] == '\n')
2510 mddev
->clevel
[len
] = 0;
2511 mddev
->level
= LEVEL_NONE
;
2515 static struct md_sysfs_entry md_level
=
2516 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2520 layout_show(mddev_t
*mddev
, char *page
)
2522 /* just a number, not meaningful for all levels */
2523 if (mddev
->reshape_position
!= MaxSector
&&
2524 mddev
->layout
!= mddev
->new_layout
)
2525 return sprintf(page
, "%d (%d)\n",
2526 mddev
->new_layout
, mddev
->layout
);
2527 return sprintf(page
, "%d\n", mddev
->layout
);
2531 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2534 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2536 if (!*buf
|| (*e
&& *e
!= '\n'))
2541 if (mddev
->reshape_position
!= MaxSector
)
2542 mddev
->new_layout
= n
;
2547 static struct md_sysfs_entry md_layout
=
2548 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2552 raid_disks_show(mddev_t
*mddev
, char *page
)
2554 if (mddev
->raid_disks
== 0)
2556 if (mddev
->reshape_position
!= MaxSector
&&
2557 mddev
->delta_disks
!= 0)
2558 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2559 mddev
->raid_disks
- mddev
->delta_disks
);
2560 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2563 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2566 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2570 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2572 if (!*buf
|| (*e
&& *e
!= '\n'))
2576 rv
= update_raid_disks(mddev
, n
);
2577 else if (mddev
->reshape_position
!= MaxSector
) {
2578 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2579 mddev
->delta_disks
= n
- olddisks
;
2580 mddev
->raid_disks
= n
;
2582 mddev
->raid_disks
= n
;
2583 return rv
? rv
: len
;
2585 static struct md_sysfs_entry md_raid_disks
=
2586 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2589 chunk_size_show(mddev_t
*mddev
, char *page
)
2591 if (mddev
->reshape_position
!= MaxSector
&&
2592 mddev
->chunk_size
!= mddev
->new_chunk
)
2593 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2595 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2599 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2601 /* can only set chunk_size if array is not yet active */
2603 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2605 if (!*buf
|| (*e
&& *e
!= '\n'))
2610 else if (mddev
->reshape_position
!= MaxSector
)
2611 mddev
->new_chunk
= n
;
2613 mddev
->chunk_size
= n
;
2616 static struct md_sysfs_entry md_chunk_size
=
2617 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2620 resync_start_show(mddev_t
*mddev
, char *page
)
2622 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2626 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2629 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2633 if (!*buf
|| (*e
&& *e
!= '\n'))
2636 mddev
->recovery_cp
= n
;
2639 static struct md_sysfs_entry md_resync_start
=
2640 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2643 * The array state can be:
2646 * No devices, no size, no level
2647 * Equivalent to STOP_ARRAY ioctl
2649 * May have some settings, but array is not active
2650 * all IO results in error
2651 * When written, doesn't tear down array, but just stops it
2652 * suspended (not supported yet)
2653 * All IO requests will block. The array can be reconfigured.
2654 * Writing this, if accepted, will block until array is quiescent
2656 * no resync can happen. no superblocks get written.
2657 * write requests fail
2659 * like readonly, but behaves like 'clean' on a write request.
2661 * clean - no pending writes, but otherwise active.
2662 * When written to inactive array, starts without resync
2663 * If a write request arrives then
2664 * if metadata is known, mark 'dirty' and switch to 'active'.
2665 * if not known, block and switch to write-pending
2666 * If written to an active array that has pending writes, then fails.
2668 * fully active: IO and resync can be happening.
2669 * When written to inactive array, starts with resync
2672 * clean, but writes are blocked waiting for 'active' to be written.
2675 * like active, but no writes have been seen for a while (100msec).
2678 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2679 write_pending
, active_idle
, bad_word
};
2680 static char *array_states
[] = {
2681 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2682 "write-pending", "active-idle", NULL
};
2684 static int match_word(const char *word
, char **list
)
2687 for (n
=0; list
[n
]; n
++)
2688 if (cmd_match(word
, list
[n
]))
2694 array_state_show(mddev_t
*mddev
, char *page
)
2696 enum array_state st
= inactive
;
2709 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2711 else if (mddev
->safemode
)
2717 if (list_empty(&mddev
->disks
) &&
2718 mddev
->raid_disks
== 0 &&
2724 return sprintf(page
, "%s\n", array_states
[st
]);
2727 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2728 static int do_md_run(mddev_t
* mddev
);
2729 static int restart_array(mddev_t
*mddev
);
2732 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2735 enum array_state st
= match_word(buf
, array_states
);
2740 /* stopping an active array */
2741 if (atomic_read(&mddev
->openers
) > 0)
2743 err
= do_md_stop(mddev
, 0, 0);
2746 /* stopping an active array */
2748 if (atomic_read(&mddev
->openers
) > 0)
2750 err
= do_md_stop(mddev
, 2, 0);
2752 err
= 0; /* already inactive */
2755 break; /* not supported yet */
2758 err
= do_md_stop(mddev
, 1, 0);
2761 set_disk_ro(mddev
->gendisk
, 1);
2762 err
= do_md_run(mddev
);
2768 err
= do_md_stop(mddev
, 1, 0);
2769 else if (mddev
->ro
== 1)
2770 err
= restart_array(mddev
);
2773 set_disk_ro(mddev
->gendisk
, 0);
2777 err
= do_md_run(mddev
);
2782 restart_array(mddev
);
2783 spin_lock_irq(&mddev
->write_lock
);
2784 if (atomic_read(&mddev
->writes_pending
) == 0) {
2785 if (mddev
->in_sync
== 0) {
2787 if (mddev
->safemode
== 1)
2788 mddev
->safemode
= 0;
2789 if (mddev
->persistent
)
2790 set_bit(MD_CHANGE_CLEAN
,
2796 spin_unlock_irq(&mddev
->write_lock
);
2799 mddev
->recovery_cp
= MaxSector
;
2800 err
= do_md_run(mddev
);
2805 restart_array(mddev
);
2806 if (mddev
->external
)
2807 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2808 wake_up(&mddev
->sb_wait
);
2812 set_disk_ro(mddev
->gendisk
, 0);
2813 err
= do_md_run(mddev
);
2818 /* these cannot be set */
2824 sysfs_notify_dirent(mddev
->sysfs_state
);
2828 static struct md_sysfs_entry md_array_state
=
2829 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2832 null_show(mddev_t
*mddev
, char *page
)
2838 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2840 /* buf must be %d:%d\n? giving major and minor numbers */
2841 /* The new device is added to the array.
2842 * If the array has a persistent superblock, we read the
2843 * superblock to initialise info and check validity.
2844 * Otherwise, only checking done is that in bind_rdev_to_array,
2845 * which mainly checks size.
2848 int major
= simple_strtoul(buf
, &e
, 10);
2854 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2856 minor
= simple_strtoul(e
+1, &e
, 10);
2857 if (*e
&& *e
!= '\n')
2859 dev
= MKDEV(major
, minor
);
2860 if (major
!= MAJOR(dev
) ||
2861 minor
!= MINOR(dev
))
2865 if (mddev
->persistent
) {
2866 rdev
= md_import_device(dev
, mddev
->major_version
,
2867 mddev
->minor_version
);
2868 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2869 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2870 mdk_rdev_t
, same_set
);
2871 err
= super_types
[mddev
->major_version
]
2872 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2876 } else if (mddev
->external
)
2877 rdev
= md_import_device(dev
, -2, -1);
2879 rdev
= md_import_device(dev
, -1, -1);
2882 return PTR_ERR(rdev
);
2883 err
= bind_rdev_to_array(rdev
, mddev
);
2887 return err
? err
: len
;
2890 static struct md_sysfs_entry md_new_device
=
2891 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2894 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2897 unsigned long chunk
, end_chunk
;
2901 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2903 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2904 if (buf
== end
) break;
2905 if (*end
== '-') { /* range */
2907 end_chunk
= simple_strtoul(buf
, &end
, 0);
2908 if (buf
== end
) break;
2910 if (*end
&& !isspace(*end
)) break;
2911 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2913 while (isspace(*buf
)) buf
++;
2915 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2920 static struct md_sysfs_entry md_bitmap
=
2921 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2924 size_show(mddev_t
*mddev
, char *page
)
2926 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2929 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
2932 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2934 /* If array is inactive, we can reduce the component size, but
2935 * not increase it (except from 0).
2936 * If array is active, we can try an on-line resize
2940 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2941 if (!*buf
|| *buf
== '\n' ||
2946 err
= update_size(mddev
, size
* 2);
2947 md_update_sb(mddev
, 1);
2949 if (mddev
->size
== 0 ||
2955 return err
? err
: len
;
2958 static struct md_sysfs_entry md_size
=
2959 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2964 * 'none' for arrays with no metadata (good luck...)
2965 * 'external' for arrays with externally managed metadata,
2966 * or N.M for internally known formats
2969 metadata_show(mddev_t
*mddev
, char *page
)
2971 if (mddev
->persistent
)
2972 return sprintf(page
, "%d.%d\n",
2973 mddev
->major_version
, mddev
->minor_version
);
2974 else if (mddev
->external
)
2975 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
2977 return sprintf(page
, "none\n");
2981 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2985 /* Changing the details of 'external' metadata is
2986 * always permitted. Otherwise there must be
2987 * no devices attached to the array.
2989 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
2991 else if (!list_empty(&mddev
->disks
))
2994 if (cmd_match(buf
, "none")) {
2995 mddev
->persistent
= 0;
2996 mddev
->external
= 0;
2997 mddev
->major_version
= 0;
2998 mddev
->minor_version
= 90;
3001 if (strncmp(buf
, "external:", 9) == 0) {
3002 size_t namelen
= len
-9;
3003 if (namelen
>= sizeof(mddev
->metadata_type
))
3004 namelen
= sizeof(mddev
->metadata_type
)-1;
3005 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3006 mddev
->metadata_type
[namelen
] = 0;
3007 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3008 mddev
->metadata_type
[--namelen
] = 0;
3009 mddev
->persistent
= 0;
3010 mddev
->external
= 1;
3011 mddev
->major_version
= 0;
3012 mddev
->minor_version
= 90;
3015 major
= simple_strtoul(buf
, &e
, 10);
3016 if (e
==buf
|| *e
!= '.')
3019 minor
= simple_strtoul(buf
, &e
, 10);
3020 if (e
==buf
|| (*e
&& *e
!= '\n') )
3022 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3024 mddev
->major_version
= major
;
3025 mddev
->minor_version
= minor
;
3026 mddev
->persistent
= 1;
3027 mddev
->external
= 0;
3031 static struct md_sysfs_entry md_metadata
=
3032 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3035 action_show(mddev_t
*mddev
, char *page
)
3037 char *type
= "idle";
3038 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3039 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3040 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3042 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3043 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3045 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3049 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3052 return sprintf(page
, "%s\n", type
);
3056 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3058 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3061 if (cmd_match(page
, "idle")) {
3062 if (mddev
->sync_thread
) {
3063 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3064 md_unregister_thread(mddev
->sync_thread
);
3065 mddev
->sync_thread
= NULL
;
3066 mddev
->recovery
= 0;
3068 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3069 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3071 else if (cmd_match(page
, "resync"))
3072 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3073 else if (cmd_match(page
, "recover")) {
3074 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3075 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3076 } else if (cmd_match(page
, "reshape")) {
3078 if (mddev
->pers
->start_reshape
== NULL
)
3080 err
= mddev
->pers
->start_reshape(mddev
);
3083 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3085 if (cmd_match(page
, "check"))
3086 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3087 else if (!cmd_match(page
, "repair"))
3089 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3090 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3092 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3093 md_wakeup_thread(mddev
->thread
);
3094 sysfs_notify_dirent(mddev
->sysfs_action
);
3099 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3101 return sprintf(page
, "%llu\n",
3102 (unsigned long long) mddev
->resync_mismatches
);
3105 static struct md_sysfs_entry md_scan_mode
=
3106 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3109 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3112 sync_min_show(mddev_t
*mddev
, char *page
)
3114 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3115 mddev
->sync_speed_min
? "local": "system");
3119 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3123 if (strncmp(buf
, "system", 6)==0) {
3124 mddev
->sync_speed_min
= 0;
3127 min
= simple_strtoul(buf
, &e
, 10);
3128 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3130 mddev
->sync_speed_min
= min
;
3134 static struct md_sysfs_entry md_sync_min
=
3135 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3138 sync_max_show(mddev_t
*mddev
, char *page
)
3140 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3141 mddev
->sync_speed_max
? "local": "system");
3145 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3149 if (strncmp(buf
, "system", 6)==0) {
3150 mddev
->sync_speed_max
= 0;
3153 max
= simple_strtoul(buf
, &e
, 10);
3154 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3156 mddev
->sync_speed_max
= max
;
3160 static struct md_sysfs_entry md_sync_max
=
3161 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3164 degraded_show(mddev_t
*mddev
, char *page
)
3166 return sprintf(page
, "%d\n", mddev
->degraded
);
3168 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3171 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3173 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3177 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3181 if (strict_strtol(buf
, 10, &n
))
3184 if (n
!= 0 && n
!= 1)
3187 mddev
->parallel_resync
= n
;
3189 if (mddev
->sync_thread
)
3190 wake_up(&resync_wait
);
3195 /* force parallel resync, even with shared block devices */
3196 static struct md_sysfs_entry md_sync_force_parallel
=
3197 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3198 sync_force_parallel_show
, sync_force_parallel_store
);
3201 sync_speed_show(mddev_t
*mddev
, char *page
)
3203 unsigned long resync
, dt
, db
;
3204 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3205 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3207 db
= resync
- mddev
->resync_mark_cnt
;
3208 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3211 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3214 sync_completed_show(mddev_t
*mddev
, char *page
)
3216 unsigned long max_blocks
, resync
;
3218 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3219 max_blocks
= mddev
->resync_max_sectors
;
3221 max_blocks
= mddev
->size
<< 1;
3223 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3224 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3227 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3230 min_sync_show(mddev_t
*mddev
, char *page
)
3232 return sprintf(page
, "%llu\n",
3233 (unsigned long long)mddev
->resync_min
);
3236 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3238 unsigned long long min
;
3239 if (strict_strtoull(buf
, 10, &min
))
3241 if (min
> mddev
->resync_max
)
3243 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3246 /* Must be a multiple of chunk_size */
3247 if (mddev
->chunk_size
) {
3248 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3251 mddev
->resync_min
= min
;
3256 static struct md_sysfs_entry md_min_sync
=
3257 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3260 max_sync_show(mddev_t
*mddev
, char *page
)
3262 if (mddev
->resync_max
== MaxSector
)
3263 return sprintf(page
, "max\n");
3265 return sprintf(page
, "%llu\n",
3266 (unsigned long long)mddev
->resync_max
);
3269 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3271 if (strncmp(buf
, "max", 3) == 0)
3272 mddev
->resync_max
= MaxSector
;
3274 unsigned long long max
;
3275 if (strict_strtoull(buf
, 10, &max
))
3277 if (max
< mddev
->resync_min
)
3279 if (max
< mddev
->resync_max
&&
3280 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3283 /* Must be a multiple of chunk_size */
3284 if (mddev
->chunk_size
) {
3285 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3288 mddev
->resync_max
= max
;
3290 wake_up(&mddev
->recovery_wait
);
3294 static struct md_sysfs_entry md_max_sync
=
3295 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3298 suspend_lo_show(mddev_t
*mddev
, char *page
)
3300 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3304 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3307 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3309 if (mddev
->pers
->quiesce
== NULL
)
3311 if (buf
== e
|| (*e
&& *e
!= '\n'))
3313 if (new >= mddev
->suspend_hi
||
3314 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3315 mddev
->suspend_lo
= new;
3316 mddev
->pers
->quiesce(mddev
, 2);
3321 static struct md_sysfs_entry md_suspend_lo
=
3322 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3326 suspend_hi_show(mddev_t
*mddev
, char *page
)
3328 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3332 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3335 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3337 if (mddev
->pers
->quiesce
== NULL
)
3339 if (buf
== e
|| (*e
&& *e
!= '\n'))
3341 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3342 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3343 mddev
->suspend_hi
= new;
3344 mddev
->pers
->quiesce(mddev
, 1);
3345 mddev
->pers
->quiesce(mddev
, 0);
3350 static struct md_sysfs_entry md_suspend_hi
=
3351 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3354 reshape_position_show(mddev_t
*mddev
, char *page
)
3356 if (mddev
->reshape_position
!= MaxSector
)
3357 return sprintf(page
, "%llu\n",
3358 (unsigned long long)mddev
->reshape_position
);
3359 strcpy(page
, "none\n");
3364 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3367 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3370 if (buf
== e
|| (*e
&& *e
!= '\n'))
3372 mddev
->reshape_position
= new;
3373 mddev
->delta_disks
= 0;
3374 mddev
->new_level
= mddev
->level
;
3375 mddev
->new_layout
= mddev
->layout
;
3376 mddev
->new_chunk
= mddev
->chunk_size
;
3380 static struct md_sysfs_entry md_reshape_position
=
3381 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3382 reshape_position_store
);
3385 static struct attribute
*md_default_attrs
[] = {
3388 &md_raid_disks
.attr
,
3389 &md_chunk_size
.attr
,
3391 &md_resync_start
.attr
,
3393 &md_new_device
.attr
,
3394 &md_safe_delay
.attr
,
3395 &md_array_state
.attr
,
3396 &md_reshape_position
.attr
,
3400 static struct attribute
*md_redundancy_attrs
[] = {
3402 &md_mismatches
.attr
,
3405 &md_sync_speed
.attr
,
3406 &md_sync_force_parallel
.attr
,
3407 &md_sync_completed
.attr
,
3410 &md_suspend_lo
.attr
,
3411 &md_suspend_hi
.attr
,
3416 static struct attribute_group md_redundancy_group
= {
3418 .attrs
= md_redundancy_attrs
,
3423 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3425 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3426 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3431 rv
= mddev_lock(mddev
);
3433 rv
= entry
->show(mddev
, page
);
3434 mddev_unlock(mddev
);
3440 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3441 const char *page
, size_t length
)
3443 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3444 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3449 if (!capable(CAP_SYS_ADMIN
))
3451 rv
= mddev_lock(mddev
);
3453 rv
= entry
->store(mddev
, page
, length
);
3454 mddev_unlock(mddev
);
3459 static void md_free(struct kobject
*ko
)
3461 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3465 static struct sysfs_ops md_sysfs_ops
= {
3466 .show
= md_attr_show
,
3467 .store
= md_attr_store
,
3469 static struct kobj_type md_ktype
= {
3471 .sysfs_ops
= &md_sysfs_ops
,
3472 .default_attrs
= md_default_attrs
,
3477 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3479 static DEFINE_MUTEX(disks_mutex
);
3480 mddev_t
*mddev
= mddev_find(dev
);
3481 struct gendisk
*disk
;
3482 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3483 int shift
= partitioned
? MdpMinorShift
: 0;
3484 int unit
= MINOR(dev
) >> shift
;
3490 mutex_lock(&disks_mutex
);
3491 if (mddev
->gendisk
) {
3492 mutex_unlock(&disks_mutex
);
3496 disk
= alloc_disk(1 << shift
);
3498 mutex_unlock(&disks_mutex
);
3502 disk
->major
= MAJOR(dev
);
3503 disk
->first_minor
= unit
<< shift
;
3505 sprintf(disk
->disk_name
, "md_d%d", unit
);
3507 sprintf(disk
->disk_name
, "md%d", unit
);
3508 disk
->fops
= &md_fops
;
3509 disk
->private_data
= mddev
;
3510 disk
->queue
= mddev
->queue
;
3511 /* Allow extended partitions. This makes the
3512 * 'mdp' device redundant, but we can really
3515 disk
->flags
|= GENHD_FL_EXT_DEVT
;
3517 mddev
->gendisk
= disk
;
3518 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3519 &disk_to_dev(disk
)->kobj
, "%s", "md");
3520 mutex_unlock(&disks_mutex
);
3522 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3525 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3526 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
3531 static void md_safemode_timeout(unsigned long data
)
3533 mddev_t
*mddev
= (mddev_t
*) data
;
3535 if (!atomic_read(&mddev
->writes_pending
)) {
3536 mddev
->safemode
= 1;
3537 if (mddev
->external
)
3538 sysfs_notify_dirent(mddev
->sysfs_state
);
3540 md_wakeup_thread(mddev
->thread
);
3543 static int start_dirty_degraded
;
3545 static int do_md_run(mddev_t
* mddev
)
3550 struct gendisk
*disk
;
3551 struct mdk_personality
*pers
;
3552 char b
[BDEVNAME_SIZE
];
3554 if (list_empty(&mddev
->disks
))
3555 /* cannot run an array with no devices.. */
3562 * Analyze all RAID superblock(s)
3564 if (!mddev
->raid_disks
) {
3565 if (!mddev
->persistent
)
3570 chunk_size
= mddev
->chunk_size
;
3573 if (chunk_size
> MAX_CHUNK_SIZE
) {
3574 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3575 chunk_size
, MAX_CHUNK_SIZE
);
3579 * chunk-size has to be a power of 2
3581 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3582 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3586 /* devices must have minimum size of one chunk */
3587 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3588 if (test_bit(Faulty
, &rdev
->flags
))
3590 if (rdev
->size
< chunk_size
/ 1024) {
3592 "md: Dev %s smaller than chunk_size:"
3594 bdevname(rdev
->bdev
,b
),
3595 (unsigned long long)rdev
->size
,
3602 if (mddev
->level
!= LEVEL_NONE
)
3603 request_module("md-level-%d", mddev
->level
);
3604 else if (mddev
->clevel
[0])
3605 request_module("md-%s", mddev
->clevel
);
3608 * Drop all container device buffers, from now on
3609 * the only valid external interface is through the md
3612 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3613 if (test_bit(Faulty
, &rdev
->flags
))
3615 sync_blockdev(rdev
->bdev
);
3616 invalidate_bdev(rdev
->bdev
);
3618 /* perform some consistency tests on the device.
3619 * We don't want the data to overlap the metadata,
3620 * Internal Bitmap issues has handled elsewhere.
3622 if (rdev
->data_offset
< rdev
->sb_start
) {
3624 rdev
->data_offset
+ mddev
->size
*2
3626 printk("md: %s: data overlaps metadata\n",
3631 if (rdev
->sb_start
+ rdev
->sb_size
/512
3632 > rdev
->data_offset
) {
3633 printk("md: %s: metadata overlaps data\n",
3638 sysfs_notify_dirent(rdev
->sysfs_state
);
3641 md_probe(mddev
->unit
, NULL
, NULL
);
3642 disk
= mddev
->gendisk
;
3646 spin_lock(&pers_lock
);
3647 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3648 if (!pers
|| !try_module_get(pers
->owner
)) {
3649 spin_unlock(&pers_lock
);
3650 if (mddev
->level
!= LEVEL_NONE
)
3651 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3654 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3659 spin_unlock(&pers_lock
);
3660 mddev
->level
= pers
->level
;
3661 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3663 if (mddev
->reshape_position
!= MaxSector
&&
3664 pers
->start_reshape
== NULL
) {
3665 /* This personality cannot handle reshaping... */
3667 module_put(pers
->owner
);
3671 if (pers
->sync_request
) {
3672 /* Warn if this is a potentially silly
3675 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3679 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3680 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
3682 rdev
->bdev
->bd_contains
==
3683 rdev2
->bdev
->bd_contains
) {
3685 "%s: WARNING: %s appears to be"
3686 " on the same physical disk as"
3689 bdevname(rdev
->bdev
,b
),
3690 bdevname(rdev2
->bdev
,b2
));
3697 "True protection against single-disk"
3698 " failure might be compromised.\n");
3701 mddev
->recovery
= 0;
3702 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3703 mddev
->barriers_work
= 1;
3704 mddev
->ok_start_degraded
= start_dirty_degraded
;
3707 mddev
->ro
= 2; /* read-only, but switch on first write */
3709 err
= mddev
->pers
->run(mddev
);
3711 printk(KERN_ERR
"md: pers->run() failed ...\n");
3712 else if (mddev
->pers
->sync_request
) {
3713 err
= bitmap_create(mddev
);
3715 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3716 mdname(mddev
), err
);
3717 mddev
->pers
->stop(mddev
);
3721 module_put(mddev
->pers
->owner
);
3723 bitmap_destroy(mddev
);
3726 if (mddev
->pers
->sync_request
) {
3727 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3729 "md: cannot register extra attributes for %s\n",
3731 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3732 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3735 atomic_set(&mddev
->writes_pending
,0);
3736 mddev
->safemode
= 0;
3737 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3738 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3739 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3742 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3743 if (rdev
->raid_disk
>= 0) {
3745 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3746 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3747 printk("md: cannot register %s for %s\n",
3751 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3754 md_update_sb(mddev
, 0);
3756 set_capacity(disk
, mddev
->array_sectors
);
3758 /* If we call blk_queue_make_request here, it will
3759 * re-initialise max_sectors etc which may have been
3760 * refined inside -> run. So just set the bits we need to set.
3761 * Most initialisation happended when we called
3762 * blk_queue_make_request(..., md_fail_request)
3765 mddev
->queue
->queuedata
= mddev
;
3766 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3768 /* If there is a partially-recovered drive we need to
3769 * start recovery here. If we leave it to md_check_recovery,
3770 * it will remove the drives and not do the right thing
3772 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3774 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3775 if (rdev
->raid_disk
>= 0 &&
3776 !test_bit(In_sync
, &rdev
->flags
) &&
3777 !test_bit(Faulty
, &rdev
->flags
))
3778 /* complete an interrupted recovery */
3780 if (spares
&& mddev
->pers
->sync_request
) {
3781 mddev
->recovery
= 0;
3782 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3783 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3786 if (!mddev
->sync_thread
) {
3787 printk(KERN_ERR
"%s: could not start resync"
3790 /* leave the spares where they are, it shouldn't hurt */
3791 mddev
->recovery
= 0;
3795 md_wakeup_thread(mddev
->thread
);
3796 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3799 md_new_event(mddev
);
3800 sysfs_notify_dirent(mddev
->sysfs_state
);
3801 if (mddev
->sysfs_action
)
3802 sysfs_notify_dirent(mddev
->sysfs_action
);
3803 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3804 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
3808 static int restart_array(mddev_t
*mddev
)
3810 struct gendisk
*disk
= mddev
->gendisk
;
3812 /* Complain if it has no devices */
3813 if (list_empty(&mddev
->disks
))
3819 mddev
->safemode
= 0;
3821 set_disk_ro(disk
, 0);
3822 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3824 /* Kick recovery or resync if necessary */
3825 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3826 md_wakeup_thread(mddev
->thread
);
3827 md_wakeup_thread(mddev
->sync_thread
);
3828 sysfs_notify_dirent(mddev
->sysfs_state
);
3832 /* similar to deny_write_access, but accounts for our holding a reference
3833 * to the file ourselves */
3834 static int deny_bitmap_write_access(struct file
* file
)
3836 struct inode
*inode
= file
->f_mapping
->host
;
3838 spin_lock(&inode
->i_lock
);
3839 if (atomic_read(&inode
->i_writecount
) > 1) {
3840 spin_unlock(&inode
->i_lock
);
3843 atomic_set(&inode
->i_writecount
, -1);
3844 spin_unlock(&inode
->i_lock
);
3849 static void restore_bitmap_write_access(struct file
*file
)
3851 struct inode
*inode
= file
->f_mapping
->host
;
3853 spin_lock(&inode
->i_lock
);
3854 atomic_set(&inode
->i_writecount
, 1);
3855 spin_unlock(&inode
->i_lock
);
3859 * 0 - completely stop and dis-assemble array
3860 * 1 - switch to readonly
3861 * 2 - stop but do not disassemble array
3863 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
3866 struct gendisk
*disk
= mddev
->gendisk
;
3868 if (atomic_read(&mddev
->openers
) > is_open
) {
3869 printk("md: %s still in use.\n",mdname(mddev
));
3875 if (mddev
->sync_thread
) {
3876 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3877 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3878 md_unregister_thread(mddev
->sync_thread
);
3879 mddev
->sync_thread
= NULL
;
3882 del_timer_sync(&mddev
->safemode_timer
);
3885 case 1: /* readonly */
3891 case 0: /* disassemble */
3893 bitmap_flush(mddev
);
3894 md_super_wait(mddev
);
3896 set_disk_ro(disk
, 0);
3897 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3898 mddev
->pers
->stop(mddev
);
3899 mddev
->queue
->merge_bvec_fn
= NULL
;
3900 mddev
->queue
->unplug_fn
= NULL
;
3901 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3902 if (mddev
->pers
->sync_request
) {
3903 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3904 if (mddev
->sysfs_action
)
3905 sysfs_put(mddev
->sysfs_action
);
3906 mddev
->sysfs_action
= NULL
;
3908 module_put(mddev
->pers
->owner
);
3910 /* tell userspace to handle 'inactive' */
3911 sysfs_notify_dirent(mddev
->sysfs_state
);
3913 set_capacity(disk
, 0);
3919 if (!mddev
->in_sync
|| mddev
->flags
) {
3920 /* mark array as shutdown cleanly */
3922 md_update_sb(mddev
, 1);
3925 set_disk_ro(disk
, 1);
3926 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3930 * Free resources if final stop
3935 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3937 bitmap_destroy(mddev
);
3938 if (mddev
->bitmap_file
) {
3939 restore_bitmap_write_access(mddev
->bitmap_file
);
3940 fput(mddev
->bitmap_file
);
3941 mddev
->bitmap_file
= NULL
;
3943 mddev
->bitmap_offset
= 0;
3945 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3946 if (rdev
->raid_disk
>= 0) {
3948 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3949 sysfs_remove_link(&mddev
->kobj
, nm
);
3952 /* make sure all md_delayed_delete calls have finished */
3953 flush_scheduled_work();
3955 export_array(mddev
);
3957 mddev
->array_sectors
= 0;
3959 mddev
->raid_disks
= 0;
3960 mddev
->recovery_cp
= 0;
3961 mddev
->resync_min
= 0;
3962 mddev
->resync_max
= MaxSector
;
3963 mddev
->reshape_position
= MaxSector
;
3964 mddev
->external
= 0;
3965 mddev
->persistent
= 0;
3966 mddev
->level
= LEVEL_NONE
;
3967 mddev
->clevel
[0] = 0;
3970 mddev
->metadata_type
[0] = 0;
3971 mddev
->chunk_size
= 0;
3972 mddev
->ctime
= mddev
->utime
= 0;
3974 mddev
->max_disks
= 0;
3976 mddev
->delta_disks
= 0;
3977 mddev
->new_level
= LEVEL_NONE
;
3978 mddev
->new_layout
= 0;
3979 mddev
->new_chunk
= 0;
3980 mddev
->curr_resync
= 0;
3981 mddev
->resync_mismatches
= 0;
3982 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
3983 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
3984 mddev
->recovery
= 0;
3987 mddev
->degraded
= 0;
3988 mddev
->barriers_work
= 0;
3989 mddev
->safemode
= 0;
3990 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
3992 } else if (mddev
->pers
)
3993 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3996 md_new_event(mddev
);
3997 sysfs_notify_dirent(mddev
->sysfs_state
);
4003 static void autorun_array(mddev_t
*mddev
)
4008 if (list_empty(&mddev
->disks
))
4011 printk(KERN_INFO
"md: running: ");
4013 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4014 char b
[BDEVNAME_SIZE
];
4015 printk("<%s>", bdevname(rdev
->bdev
,b
));
4019 err
= do_md_run(mddev
);
4021 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4022 do_md_stop(mddev
, 0, 0);
4027 * lets try to run arrays based on all disks that have arrived
4028 * until now. (those are in pending_raid_disks)
4030 * the method: pick the first pending disk, collect all disks with
4031 * the same UUID, remove all from the pending list and put them into
4032 * the 'same_array' list. Then order this list based on superblock
4033 * update time (freshest comes first), kick out 'old' disks and
4034 * compare superblocks. If everything's fine then run it.
4036 * If "unit" is allocated, then bump its reference count
4038 static void autorun_devices(int part
)
4040 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4042 char b
[BDEVNAME_SIZE
];
4044 printk(KERN_INFO
"md: autorun ...\n");
4045 while (!list_empty(&pending_raid_disks
)) {
4048 LIST_HEAD(candidates
);
4049 rdev0
= list_entry(pending_raid_disks
.next
,
4050 mdk_rdev_t
, same_set
);
4052 printk(KERN_INFO
"md: considering %s ...\n",
4053 bdevname(rdev0
->bdev
,b
));
4054 INIT_LIST_HEAD(&candidates
);
4055 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4056 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4057 printk(KERN_INFO
"md: adding %s ...\n",
4058 bdevname(rdev
->bdev
,b
));
4059 list_move(&rdev
->same_set
, &candidates
);
4062 * now we have a set of devices, with all of them having
4063 * mostly sane superblocks. It's time to allocate the
4067 dev
= MKDEV(mdp_major
,
4068 rdev0
->preferred_minor
<< MdpMinorShift
);
4069 unit
= MINOR(dev
) >> MdpMinorShift
;
4071 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4074 if (rdev0
->preferred_minor
!= unit
) {
4075 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4076 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4080 md_probe(dev
, NULL
, NULL
);
4081 mddev
= mddev_find(dev
);
4082 if (!mddev
|| !mddev
->gendisk
) {
4086 "md: cannot allocate memory for md drive.\n");
4089 if (mddev_lock(mddev
))
4090 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4092 else if (mddev
->raid_disks
|| mddev
->major_version
4093 || !list_empty(&mddev
->disks
)) {
4095 "md: %s already running, cannot run %s\n",
4096 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4097 mddev_unlock(mddev
);
4099 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4100 mddev
->persistent
= 1;
4101 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4102 list_del_init(&rdev
->same_set
);
4103 if (bind_rdev_to_array(rdev
, mddev
))
4106 autorun_array(mddev
);
4107 mddev_unlock(mddev
);
4109 /* on success, candidates will be empty, on error
4112 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4113 list_del_init(&rdev
->same_set
);
4118 printk(KERN_INFO
"md: ... autorun DONE.\n");
4120 #endif /* !MODULE */
4122 static int get_version(void __user
* arg
)
4126 ver
.major
= MD_MAJOR_VERSION
;
4127 ver
.minor
= MD_MINOR_VERSION
;
4128 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4130 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4136 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4138 mdu_array_info_t info
;
4139 int nr
,working
,active
,failed
,spare
;
4142 nr
=working
=active
=failed
=spare
=0;
4143 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4145 if (test_bit(Faulty
, &rdev
->flags
))
4149 if (test_bit(In_sync
, &rdev
->flags
))
4156 info
.major_version
= mddev
->major_version
;
4157 info
.minor_version
= mddev
->minor_version
;
4158 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4159 info
.ctime
= mddev
->ctime
;
4160 info
.level
= mddev
->level
;
4161 info
.size
= mddev
->size
;
4162 if (info
.size
!= mddev
->size
) /* overflow */
4165 info
.raid_disks
= mddev
->raid_disks
;
4166 info
.md_minor
= mddev
->md_minor
;
4167 info
.not_persistent
= !mddev
->persistent
;
4169 info
.utime
= mddev
->utime
;
4172 info
.state
= (1<<MD_SB_CLEAN
);
4173 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4174 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4175 info
.active_disks
= active
;
4176 info
.working_disks
= working
;
4177 info
.failed_disks
= failed
;
4178 info
.spare_disks
= spare
;
4180 info
.layout
= mddev
->layout
;
4181 info
.chunk_size
= mddev
->chunk_size
;
4183 if (copy_to_user(arg
, &info
, sizeof(info
)))
4189 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4191 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4192 char *ptr
, *buf
= NULL
;
4195 if (md_allow_write(mddev
))
4196 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4198 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4203 /* bitmap disabled, zero the first byte and copy out */
4204 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4205 file
->pathname
[0] = '\0';
4209 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4213 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4217 strcpy(file
->pathname
, ptr
);
4221 if (copy_to_user(arg
, file
, sizeof(*file
)))
4229 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4231 mdu_disk_info_t info
;
4234 if (copy_from_user(&info
, arg
, sizeof(info
)))
4237 rdev
= find_rdev_nr(mddev
, info
.number
);
4239 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4240 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4241 info
.raid_disk
= rdev
->raid_disk
;
4243 if (test_bit(Faulty
, &rdev
->flags
))
4244 info
.state
|= (1<<MD_DISK_FAULTY
);
4245 else if (test_bit(In_sync
, &rdev
->flags
)) {
4246 info
.state
|= (1<<MD_DISK_ACTIVE
);
4247 info
.state
|= (1<<MD_DISK_SYNC
);
4249 if (test_bit(WriteMostly
, &rdev
->flags
))
4250 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4252 info
.major
= info
.minor
= 0;
4253 info
.raid_disk
= -1;
4254 info
.state
= (1<<MD_DISK_REMOVED
);
4257 if (copy_to_user(arg
, &info
, sizeof(info
)))
4263 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4265 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4267 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4269 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4272 if (!mddev
->raid_disks
) {
4274 /* expecting a device which has a superblock */
4275 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4278 "md: md_import_device returned %ld\n",
4280 return PTR_ERR(rdev
);
4282 if (!list_empty(&mddev
->disks
)) {
4283 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4284 mdk_rdev_t
, same_set
);
4285 int err
= super_types
[mddev
->major_version
]
4286 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4289 "md: %s has different UUID to %s\n",
4290 bdevname(rdev
->bdev
,b
),
4291 bdevname(rdev0
->bdev
,b2
));
4296 err
= bind_rdev_to_array(rdev
, mddev
);
4303 * add_new_disk can be used once the array is assembled
4304 * to add "hot spares". They must already have a superblock
4309 if (!mddev
->pers
->hot_add_disk
) {
4311 "%s: personality does not support diskops!\n",
4315 if (mddev
->persistent
)
4316 rdev
= md_import_device(dev
, mddev
->major_version
,
4317 mddev
->minor_version
);
4319 rdev
= md_import_device(dev
, -1, -1);
4322 "md: md_import_device returned %ld\n",
4324 return PTR_ERR(rdev
);
4326 /* set save_raid_disk if appropriate */
4327 if (!mddev
->persistent
) {
4328 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4329 info
->raid_disk
< mddev
->raid_disks
)
4330 rdev
->raid_disk
= info
->raid_disk
;
4332 rdev
->raid_disk
= -1;
4334 super_types
[mddev
->major_version
].
4335 validate_super(mddev
, rdev
);
4336 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4338 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4339 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4340 set_bit(WriteMostly
, &rdev
->flags
);
4342 rdev
->raid_disk
= -1;
4343 err
= bind_rdev_to_array(rdev
, mddev
);
4344 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4345 /* If there is hot_add_disk but no hot_remove_disk
4346 * then added disks for geometry changes,
4347 * and should be added immediately.
4349 super_types
[mddev
->major_version
].
4350 validate_super(mddev
, rdev
);
4351 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4353 unbind_rdev_from_array(rdev
);
4358 sysfs_notify_dirent(rdev
->sysfs_state
);
4360 md_update_sb(mddev
, 1);
4361 if (mddev
->degraded
)
4362 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4363 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4364 md_wakeup_thread(mddev
->thread
);
4368 /* otherwise, add_new_disk is only allowed
4369 * for major_version==0 superblocks
4371 if (mddev
->major_version
!= 0) {
4372 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4377 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4379 rdev
= md_import_device(dev
, -1, 0);
4382 "md: error, md_import_device() returned %ld\n",
4384 return PTR_ERR(rdev
);
4386 rdev
->desc_nr
= info
->number
;
4387 if (info
->raid_disk
< mddev
->raid_disks
)
4388 rdev
->raid_disk
= info
->raid_disk
;
4390 rdev
->raid_disk
= -1;
4392 if (rdev
->raid_disk
< mddev
->raid_disks
)
4393 if (info
->state
& (1<<MD_DISK_SYNC
))
4394 set_bit(In_sync
, &rdev
->flags
);
4396 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4397 set_bit(WriteMostly
, &rdev
->flags
);
4399 if (!mddev
->persistent
) {
4400 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4401 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4403 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4404 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4406 err
= bind_rdev_to_array(rdev
, mddev
);
4416 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4418 char b
[BDEVNAME_SIZE
];
4421 rdev
= find_rdev(mddev
, dev
);
4425 if (rdev
->raid_disk
>= 0)
4428 kick_rdev_from_array(rdev
);
4429 md_update_sb(mddev
, 1);
4430 md_new_event(mddev
);
4434 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4435 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4439 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4441 char b
[BDEVNAME_SIZE
];
4448 if (mddev
->major_version
!= 0) {
4449 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4450 " version-0 superblocks.\n",
4454 if (!mddev
->pers
->hot_add_disk
) {
4456 "%s: personality does not support diskops!\n",
4461 rdev
= md_import_device(dev
, -1, 0);
4464 "md: error, md_import_device() returned %ld\n",
4469 if (mddev
->persistent
)
4470 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4472 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4474 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4476 if (test_bit(Faulty
, &rdev
->flags
)) {
4478 "md: can not hot-add faulty %s disk to %s!\n",
4479 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4483 clear_bit(In_sync
, &rdev
->flags
);
4485 rdev
->saved_raid_disk
= -1;
4486 err
= bind_rdev_to_array(rdev
, mddev
);
4491 * The rest should better be atomic, we can have disk failures
4492 * noticed in interrupt contexts ...
4495 if (rdev
->desc_nr
== mddev
->max_disks
) {
4496 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4499 goto abort_unbind_export
;
4502 rdev
->raid_disk
= -1;
4504 md_update_sb(mddev
, 1);
4507 * Kick recovery, maybe this spare has to be added to the
4508 * array immediately.
4510 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4511 md_wakeup_thread(mddev
->thread
);
4512 md_new_event(mddev
);
4515 abort_unbind_export
:
4516 unbind_rdev_from_array(rdev
);
4523 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4528 if (!mddev
->pers
->quiesce
)
4530 if (mddev
->recovery
|| mddev
->sync_thread
)
4532 /* we should be able to change the bitmap.. */
4538 return -EEXIST
; /* cannot add when bitmap is present */
4539 mddev
->bitmap_file
= fget(fd
);
4541 if (mddev
->bitmap_file
== NULL
) {
4542 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4547 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4549 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4551 fput(mddev
->bitmap_file
);
4552 mddev
->bitmap_file
= NULL
;
4555 mddev
->bitmap_offset
= 0; /* file overrides offset */
4556 } else if (mddev
->bitmap
== NULL
)
4557 return -ENOENT
; /* cannot remove what isn't there */
4560 mddev
->pers
->quiesce(mddev
, 1);
4562 err
= bitmap_create(mddev
);
4563 if (fd
< 0 || err
) {
4564 bitmap_destroy(mddev
);
4565 fd
= -1; /* make sure to put the file */
4567 mddev
->pers
->quiesce(mddev
, 0);
4570 if (mddev
->bitmap_file
) {
4571 restore_bitmap_write_access(mddev
->bitmap_file
);
4572 fput(mddev
->bitmap_file
);
4574 mddev
->bitmap_file
= NULL
;
4581 * set_array_info is used two different ways
4582 * The original usage is when creating a new array.
4583 * In this usage, raid_disks is > 0 and it together with
4584 * level, size, not_persistent,layout,chunksize determine the
4585 * shape of the array.
4586 * This will always create an array with a type-0.90.0 superblock.
4587 * The newer usage is when assembling an array.
4588 * In this case raid_disks will be 0, and the major_version field is
4589 * use to determine which style super-blocks are to be found on the devices.
4590 * The minor and patch _version numbers are also kept incase the
4591 * super_block handler wishes to interpret them.
4593 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4596 if (info
->raid_disks
== 0) {
4597 /* just setting version number for superblock loading */
4598 if (info
->major_version
< 0 ||
4599 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4600 super_types
[info
->major_version
].name
== NULL
) {
4601 /* maybe try to auto-load a module? */
4603 "md: superblock version %d not known\n",
4604 info
->major_version
);
4607 mddev
->major_version
= info
->major_version
;
4608 mddev
->minor_version
= info
->minor_version
;
4609 mddev
->patch_version
= info
->patch_version
;
4610 mddev
->persistent
= !info
->not_persistent
;
4613 mddev
->major_version
= MD_MAJOR_VERSION
;
4614 mddev
->minor_version
= MD_MINOR_VERSION
;
4615 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4616 mddev
->ctime
= get_seconds();
4618 mddev
->level
= info
->level
;
4619 mddev
->clevel
[0] = 0;
4620 mddev
->size
= info
->size
;
4621 mddev
->raid_disks
= info
->raid_disks
;
4622 /* don't set md_minor, it is determined by which /dev/md* was
4625 if (info
->state
& (1<<MD_SB_CLEAN
))
4626 mddev
->recovery_cp
= MaxSector
;
4628 mddev
->recovery_cp
= 0;
4629 mddev
->persistent
= ! info
->not_persistent
;
4630 mddev
->external
= 0;
4632 mddev
->layout
= info
->layout
;
4633 mddev
->chunk_size
= info
->chunk_size
;
4635 mddev
->max_disks
= MD_SB_DISKS
;
4637 if (mddev
->persistent
)
4639 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4641 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4642 mddev
->bitmap_offset
= 0;
4644 mddev
->reshape_position
= MaxSector
;
4647 * Generate a 128 bit UUID
4649 get_random_bytes(mddev
->uuid
, 16);
4651 mddev
->new_level
= mddev
->level
;
4652 mddev
->new_chunk
= mddev
->chunk_size
;
4653 mddev
->new_layout
= mddev
->layout
;
4654 mddev
->delta_disks
= 0;
4659 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
4663 int fit
= (num_sectors
== 0);
4665 if (mddev
->pers
->resize
== NULL
)
4667 /* The "num_sectors" is the number of sectors of each device that
4668 * is used. This can only make sense for arrays with redundancy.
4669 * linear and raid0 always use whatever space is available. We can only
4670 * consider changing this number if no resync or reconstruction is
4671 * happening, and if the new size is acceptable. It must fit before the
4672 * sb_start or, if that is <data_offset, it must fit before the size
4673 * of each device. If num_sectors is zero, we find the largest size
4677 if (mddev
->sync_thread
)
4680 /* Sorry, cannot grow a bitmap yet, just remove it,
4684 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4686 avail
= rdev
->size
* 2;
4688 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
4689 num_sectors
= avail
;
4690 if (avail
< num_sectors
)
4693 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
4695 struct block_device
*bdev
;
4697 bdev
= bdget_disk(mddev
->gendisk
, 0);
4699 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4700 i_size_write(bdev
->bd_inode
,
4701 (loff_t
)mddev
->array_sectors
<< 9);
4702 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4709 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4712 /* change the number of raid disks */
4713 if (mddev
->pers
->check_reshape
== NULL
)
4715 if (raid_disks
<= 0 ||
4716 raid_disks
>= mddev
->max_disks
)
4718 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4720 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4722 rv
= mddev
->pers
->check_reshape(mddev
);
4728 * update_array_info is used to change the configuration of an
4730 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4731 * fields in the info are checked against the array.
4732 * Any differences that cannot be handled will cause an error.
4733 * Normally, only one change can be managed at a time.
4735 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4741 /* calculate expected state,ignoring low bits */
4742 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4743 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4745 if (mddev
->major_version
!= info
->major_version
||
4746 mddev
->minor_version
!= info
->minor_version
||
4747 /* mddev->patch_version != info->patch_version || */
4748 mddev
->ctime
!= info
->ctime
||
4749 mddev
->level
!= info
->level
||
4750 /* mddev->layout != info->layout || */
4751 !mddev
->persistent
!= info
->not_persistent
||
4752 mddev
->chunk_size
!= info
->chunk_size
||
4753 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4754 ((state
^info
->state
) & 0xfffffe00)
4757 /* Check there is only one change */
4758 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4759 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4760 if (mddev
->layout
!= info
->layout
) cnt
++;
4761 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4762 if (cnt
== 0) return 0;
4763 if (cnt
> 1) return -EINVAL
;
4765 if (mddev
->layout
!= info
->layout
) {
4767 * we don't need to do anything at the md level, the
4768 * personality will take care of it all.
4770 if (mddev
->pers
->reconfig
== NULL
)
4773 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4775 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4776 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
4778 if (mddev
->raid_disks
!= info
->raid_disks
)
4779 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4781 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4782 if (mddev
->pers
->quiesce
== NULL
)
4784 if (mddev
->recovery
|| mddev
->sync_thread
)
4786 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4787 /* add the bitmap */
4790 if (mddev
->default_bitmap_offset
== 0)
4792 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4793 mddev
->pers
->quiesce(mddev
, 1);
4794 rv
= bitmap_create(mddev
);
4796 bitmap_destroy(mddev
);
4797 mddev
->pers
->quiesce(mddev
, 0);
4799 /* remove the bitmap */
4802 if (mddev
->bitmap
->file
)
4804 mddev
->pers
->quiesce(mddev
, 1);
4805 bitmap_destroy(mddev
);
4806 mddev
->pers
->quiesce(mddev
, 0);
4807 mddev
->bitmap_offset
= 0;
4810 md_update_sb(mddev
, 1);
4814 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4818 if (mddev
->pers
== NULL
)
4821 rdev
= find_rdev(mddev
, dev
);
4825 md_error(mddev
, rdev
);
4830 * We have a problem here : there is no easy way to give a CHS
4831 * virtual geometry. We currently pretend that we have a 2 heads
4832 * 4 sectors (with a BIG number of cylinders...). This drives
4833 * dosfs just mad... ;-)
4835 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4837 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4841 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4845 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
4846 unsigned int cmd
, unsigned long arg
)
4849 void __user
*argp
= (void __user
*)arg
;
4850 mddev_t
*mddev
= NULL
;
4852 if (!capable(CAP_SYS_ADMIN
))
4856 * Commands dealing with the RAID driver but not any
4862 err
= get_version(argp
);
4865 case PRINT_RAID_DEBUG
:
4873 autostart_arrays(arg
);
4880 * Commands creating/starting a new array:
4883 mddev
= bdev
->bd_disk
->private_data
;
4890 err
= mddev_lock(mddev
);
4893 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4900 case SET_ARRAY_INFO
:
4902 mdu_array_info_t info
;
4904 memset(&info
, 0, sizeof(info
));
4905 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4910 err
= update_array_info(mddev
, &info
);
4912 printk(KERN_WARNING
"md: couldn't update"
4913 " array info. %d\n", err
);
4918 if (!list_empty(&mddev
->disks
)) {
4920 "md: array %s already has disks!\n",
4925 if (mddev
->raid_disks
) {
4927 "md: array %s already initialised!\n",
4932 err
= set_array_info(mddev
, &info
);
4934 printk(KERN_WARNING
"md: couldn't set"
4935 " array info. %d\n", err
);
4945 * Commands querying/configuring an existing array:
4947 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4948 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4949 if ((!mddev
->raid_disks
&& !mddev
->external
)
4950 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4951 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4952 && cmd
!= GET_BITMAP_FILE
) {
4958 * Commands even a read-only array can execute:
4962 case GET_ARRAY_INFO
:
4963 err
= get_array_info(mddev
, argp
);
4966 case GET_BITMAP_FILE
:
4967 err
= get_bitmap_file(mddev
, argp
);
4971 err
= get_disk_info(mddev
, argp
);
4974 case RESTART_ARRAY_RW
:
4975 err
= restart_array(mddev
);
4979 err
= do_md_stop(mddev
, 0, 1);
4983 err
= do_md_stop(mddev
, 1, 1);
4989 * The remaining ioctls are changing the state of the
4990 * superblock, so we do not allow them on read-only arrays.
4991 * However non-MD ioctls (e.g. get-size) will still come through
4992 * here and hit the 'default' below, so only disallow
4993 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4995 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
4996 if (mddev
->ro
== 2) {
4998 sysfs_notify_dirent(mddev
->sysfs_state
);
4999 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5000 md_wakeup_thread(mddev
->thread
);
5011 mdu_disk_info_t info
;
5012 if (copy_from_user(&info
, argp
, sizeof(info
)))
5015 err
= add_new_disk(mddev
, &info
);
5019 case HOT_REMOVE_DISK
:
5020 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5024 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5027 case SET_DISK_FAULTY
:
5028 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5032 err
= do_md_run(mddev
);
5035 case SET_BITMAP_FILE
:
5036 err
= set_bitmap_file(mddev
, (int)arg
);
5046 mddev_unlock(mddev
);
5056 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5059 * Succeed if we can lock the mddev, which confirms that
5060 * it isn't being stopped right now.
5062 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5065 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5070 atomic_inc(&mddev
->openers
);
5071 mddev_unlock(mddev
);
5073 check_disk_change(bdev
);
5078 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5080 mddev_t
*mddev
= disk
->private_data
;
5083 atomic_dec(&mddev
->openers
);
5089 static int md_media_changed(struct gendisk
*disk
)
5091 mddev_t
*mddev
= disk
->private_data
;
5093 return mddev
->changed
;
5096 static int md_revalidate(struct gendisk
*disk
)
5098 mddev_t
*mddev
= disk
->private_data
;
5103 static struct block_device_operations md_fops
=
5105 .owner
= THIS_MODULE
,
5107 .release
= md_release
,
5108 .locked_ioctl
= md_ioctl
,
5109 .getgeo
= md_getgeo
,
5110 .media_changed
= md_media_changed
,
5111 .revalidate_disk
= md_revalidate
,
5114 static int md_thread(void * arg
)
5116 mdk_thread_t
*thread
= arg
;
5119 * md_thread is a 'system-thread', it's priority should be very
5120 * high. We avoid resource deadlocks individually in each
5121 * raid personality. (RAID5 does preallocation) We also use RR and
5122 * the very same RT priority as kswapd, thus we will never get
5123 * into a priority inversion deadlock.
5125 * we definitely have to have equal or higher priority than
5126 * bdflush, otherwise bdflush will deadlock if there are too
5127 * many dirty RAID5 blocks.
5130 allow_signal(SIGKILL
);
5131 while (!kthread_should_stop()) {
5133 /* We need to wait INTERRUPTIBLE so that
5134 * we don't add to the load-average.
5135 * That means we need to be sure no signals are
5138 if (signal_pending(current
))
5139 flush_signals(current
);
5141 wait_event_interruptible_timeout
5143 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5144 || kthread_should_stop(),
5147 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5149 thread
->run(thread
->mddev
);
5155 void md_wakeup_thread(mdk_thread_t
*thread
)
5158 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5159 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5160 wake_up(&thread
->wqueue
);
5164 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5167 mdk_thread_t
*thread
;
5169 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5173 init_waitqueue_head(&thread
->wqueue
);
5176 thread
->mddev
= mddev
;
5177 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5178 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5179 if (IS_ERR(thread
->tsk
)) {
5186 void md_unregister_thread(mdk_thread_t
*thread
)
5188 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5190 kthread_stop(thread
->tsk
);
5194 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5201 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5204 if (mddev
->external
)
5205 set_bit(Blocked
, &rdev
->flags
);
5207 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5209 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5210 __builtin_return_address(0),__builtin_return_address(1),
5211 __builtin_return_address(2),__builtin_return_address(3));
5215 if (!mddev
->pers
->error_handler
)
5217 mddev
->pers
->error_handler(mddev
,rdev
);
5218 if (mddev
->degraded
)
5219 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5220 set_bit(StateChanged
, &rdev
->flags
);
5221 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5222 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5223 md_wakeup_thread(mddev
->thread
);
5224 md_new_event_inintr(mddev
);
5227 /* seq_file implementation /proc/mdstat */
5229 static void status_unused(struct seq_file
*seq
)
5234 seq_printf(seq
, "unused devices: ");
5236 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5237 char b
[BDEVNAME_SIZE
];
5239 seq_printf(seq
, "%s ",
5240 bdevname(rdev
->bdev
,b
));
5243 seq_printf(seq
, "<none>");
5245 seq_printf(seq
, "\n");
5249 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5251 sector_t max_blocks
, resync
, res
;
5252 unsigned long dt
, db
, rt
;
5254 unsigned int per_milli
;
5256 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5258 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5259 max_blocks
= mddev
->resync_max_sectors
>> 1;
5261 max_blocks
= mddev
->size
;
5264 * Should not happen.
5270 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5271 * in a sector_t, and (max_blocks>>scale) will fit in a
5272 * u32, as those are the requirements for sector_div.
5273 * Thus 'scale' must be at least 10
5276 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5277 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5280 res
= (resync
>>scale
)*1000;
5281 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5285 int i
, x
= per_milli
/50, y
= 20-x
;
5286 seq_printf(seq
, "[");
5287 for (i
= 0; i
< x
; i
++)
5288 seq_printf(seq
, "=");
5289 seq_printf(seq
, ">");
5290 for (i
= 0; i
< y
; i
++)
5291 seq_printf(seq
, ".");
5292 seq_printf(seq
, "] ");
5294 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5295 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5297 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5299 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5300 "resync" : "recovery"))),
5301 per_milli
/10, per_milli
% 10,
5302 (unsigned long long) resync
,
5303 (unsigned long long) max_blocks
);
5306 * We do not want to overflow, so the order of operands and
5307 * the * 100 / 100 trick are important. We do a +1 to be
5308 * safe against division by zero. We only estimate anyway.
5310 * dt: time from mark until now
5311 * db: blocks written from mark until now
5312 * rt: remaining time
5314 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5316 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5317 - mddev
->resync_mark_cnt
;
5318 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5320 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5322 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5325 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5327 struct list_head
*tmp
;
5337 spin_lock(&all_mddevs_lock
);
5338 list_for_each(tmp
,&all_mddevs
)
5340 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5342 spin_unlock(&all_mddevs_lock
);
5345 spin_unlock(&all_mddevs_lock
);
5347 return (void*)2;/* tail */
5351 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5353 struct list_head
*tmp
;
5354 mddev_t
*next_mddev
, *mddev
= v
;
5360 spin_lock(&all_mddevs_lock
);
5362 tmp
= all_mddevs
.next
;
5364 tmp
= mddev
->all_mddevs
.next
;
5365 if (tmp
!= &all_mddevs
)
5366 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5368 next_mddev
= (void*)2;
5371 spin_unlock(&all_mddevs_lock
);
5379 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5383 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5387 struct mdstat_info
{
5391 static int md_seq_show(struct seq_file
*seq
, void *v
)
5396 struct mdstat_info
*mi
= seq
->private;
5397 struct bitmap
*bitmap
;
5399 if (v
== (void*)1) {
5400 struct mdk_personality
*pers
;
5401 seq_printf(seq
, "Personalities : ");
5402 spin_lock(&pers_lock
);
5403 list_for_each_entry(pers
, &pers_list
, list
)
5404 seq_printf(seq
, "[%s] ", pers
->name
);
5406 spin_unlock(&pers_lock
);
5407 seq_printf(seq
, "\n");
5408 mi
->event
= atomic_read(&md_event_count
);
5411 if (v
== (void*)2) {
5416 if (mddev_lock(mddev
) < 0)
5419 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5420 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5421 mddev
->pers
? "" : "in");
5424 seq_printf(seq
, " (read-only)");
5426 seq_printf(seq
, " (auto-read-only)");
5427 seq_printf(seq
, " %s", mddev
->pers
->name
);
5431 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5432 char b
[BDEVNAME_SIZE
];
5433 seq_printf(seq
, " %s[%d]",
5434 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5435 if (test_bit(WriteMostly
, &rdev
->flags
))
5436 seq_printf(seq
, "(W)");
5437 if (test_bit(Faulty
, &rdev
->flags
)) {
5438 seq_printf(seq
, "(F)");
5440 } else if (rdev
->raid_disk
< 0)
5441 seq_printf(seq
, "(S)"); /* spare */
5445 if (!list_empty(&mddev
->disks
)) {
5447 seq_printf(seq
, "\n %llu blocks",
5448 (unsigned long long)
5449 mddev
->array_sectors
/ 2);
5451 seq_printf(seq
, "\n %llu blocks",
5452 (unsigned long long)size
);
5454 if (mddev
->persistent
) {
5455 if (mddev
->major_version
!= 0 ||
5456 mddev
->minor_version
!= 90) {
5457 seq_printf(seq
," super %d.%d",
5458 mddev
->major_version
,
5459 mddev
->minor_version
);
5461 } else if (mddev
->external
)
5462 seq_printf(seq
, " super external:%s",
5463 mddev
->metadata_type
);
5465 seq_printf(seq
, " super non-persistent");
5468 mddev
->pers
->status(seq
, mddev
);
5469 seq_printf(seq
, "\n ");
5470 if (mddev
->pers
->sync_request
) {
5471 if (mddev
->curr_resync
> 2) {
5472 status_resync(seq
, mddev
);
5473 seq_printf(seq
, "\n ");
5474 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5475 seq_printf(seq
, "\tresync=DELAYED\n ");
5476 else if (mddev
->recovery_cp
< MaxSector
)
5477 seq_printf(seq
, "\tresync=PENDING\n ");
5480 seq_printf(seq
, "\n ");
5482 if ((bitmap
= mddev
->bitmap
)) {
5483 unsigned long chunk_kb
;
5484 unsigned long flags
;
5485 spin_lock_irqsave(&bitmap
->lock
, flags
);
5486 chunk_kb
= bitmap
->chunksize
>> 10;
5487 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5489 bitmap
->pages
- bitmap
->missing_pages
,
5491 (bitmap
->pages
- bitmap
->missing_pages
)
5492 << (PAGE_SHIFT
- 10),
5493 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5494 chunk_kb
? "KB" : "B");
5496 seq_printf(seq
, ", file: ");
5497 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5500 seq_printf(seq
, "\n");
5501 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5504 seq_printf(seq
, "\n");
5506 mddev_unlock(mddev
);
5511 static struct seq_operations md_seq_ops
= {
5512 .start
= md_seq_start
,
5513 .next
= md_seq_next
,
5514 .stop
= md_seq_stop
,
5515 .show
= md_seq_show
,
5518 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5521 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5525 error
= seq_open(file
, &md_seq_ops
);
5529 struct seq_file
*p
= file
->private_data
;
5531 mi
->event
= atomic_read(&md_event_count
);
5536 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5538 struct seq_file
*m
= filp
->private_data
;
5539 struct mdstat_info
*mi
= m
->private;
5542 poll_wait(filp
, &md_event_waiters
, wait
);
5544 /* always allow read */
5545 mask
= POLLIN
| POLLRDNORM
;
5547 if (mi
->event
!= atomic_read(&md_event_count
))
5548 mask
|= POLLERR
| POLLPRI
;
5552 static const struct file_operations md_seq_fops
= {
5553 .owner
= THIS_MODULE
,
5554 .open
= md_seq_open
,
5556 .llseek
= seq_lseek
,
5557 .release
= seq_release_private
,
5558 .poll
= mdstat_poll
,
5561 int register_md_personality(struct mdk_personality
*p
)
5563 spin_lock(&pers_lock
);
5564 list_add_tail(&p
->list
, &pers_list
);
5565 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5566 spin_unlock(&pers_lock
);
5570 int unregister_md_personality(struct mdk_personality
*p
)
5572 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5573 spin_lock(&pers_lock
);
5574 list_del_init(&p
->list
);
5575 spin_unlock(&pers_lock
);
5579 static int is_mddev_idle(mddev_t
*mddev
)
5587 rdev_for_each_rcu(rdev
, mddev
) {
5588 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5589 curr_events
= part_stat_read(&disk
->part0
, sectors
[0]) +
5590 part_stat_read(&disk
->part0
, sectors
[1]) -
5591 atomic_read(&disk
->sync_io
);
5592 /* sync IO will cause sync_io to increase before the disk_stats
5593 * as sync_io is counted when a request starts, and
5594 * disk_stats is counted when it completes.
5595 * So resync activity will cause curr_events to be smaller than
5596 * when there was no such activity.
5597 * non-sync IO will cause disk_stat to increase without
5598 * increasing sync_io so curr_events will (eventually)
5599 * be larger than it was before. Once it becomes
5600 * substantially larger, the test below will cause
5601 * the array to appear non-idle, and resync will slow
5603 * If there is a lot of outstanding resync activity when
5604 * we set last_event to curr_events, then all that activity
5605 * completing might cause the array to appear non-idle
5606 * and resync will be slowed down even though there might
5607 * not have been non-resync activity. This will only
5608 * happen once though. 'last_events' will soon reflect
5609 * the state where there is little or no outstanding
5610 * resync requests, and further resync activity will
5611 * always make curr_events less than last_events.
5614 if (curr_events
- rdev
->last_events
> 4096) {
5615 rdev
->last_events
= curr_events
;
5623 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5625 /* another "blocks" (512byte) blocks have been synced */
5626 atomic_sub(blocks
, &mddev
->recovery_active
);
5627 wake_up(&mddev
->recovery_wait
);
5629 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5630 md_wakeup_thread(mddev
->thread
);
5631 // stop recovery, signal do_sync ....
5636 /* md_write_start(mddev, bi)
5637 * If we need to update some array metadata (e.g. 'active' flag
5638 * in superblock) before writing, schedule a superblock update
5639 * and wait for it to complete.
5641 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5644 if (bio_data_dir(bi
) != WRITE
)
5647 BUG_ON(mddev
->ro
== 1);
5648 if (mddev
->ro
== 2) {
5649 /* need to switch to read/write */
5651 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5652 md_wakeup_thread(mddev
->thread
);
5653 md_wakeup_thread(mddev
->sync_thread
);
5656 atomic_inc(&mddev
->writes_pending
);
5657 if (mddev
->safemode
== 1)
5658 mddev
->safemode
= 0;
5659 if (mddev
->in_sync
) {
5660 spin_lock_irq(&mddev
->write_lock
);
5661 if (mddev
->in_sync
) {
5663 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5664 md_wakeup_thread(mddev
->thread
);
5667 spin_unlock_irq(&mddev
->write_lock
);
5670 sysfs_notify_dirent(mddev
->sysfs_state
);
5671 wait_event(mddev
->sb_wait
,
5672 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5673 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5676 void md_write_end(mddev_t
*mddev
)
5678 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5679 if (mddev
->safemode
== 2)
5680 md_wakeup_thread(mddev
->thread
);
5681 else if (mddev
->safemode_delay
)
5682 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5686 /* md_allow_write(mddev)
5687 * Calling this ensures that the array is marked 'active' so that writes
5688 * may proceed without blocking. It is important to call this before
5689 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5690 * Must be called with mddev_lock held.
5692 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5693 * is dropped, so return -EAGAIN after notifying userspace.
5695 int md_allow_write(mddev_t
*mddev
)
5701 if (!mddev
->pers
->sync_request
)
5704 spin_lock_irq(&mddev
->write_lock
);
5705 if (mddev
->in_sync
) {
5707 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5708 if (mddev
->safemode_delay
&&
5709 mddev
->safemode
== 0)
5710 mddev
->safemode
= 1;
5711 spin_unlock_irq(&mddev
->write_lock
);
5712 md_update_sb(mddev
, 0);
5713 sysfs_notify_dirent(mddev
->sysfs_state
);
5715 spin_unlock_irq(&mddev
->write_lock
);
5717 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
5722 EXPORT_SYMBOL_GPL(md_allow_write
);
5724 #define SYNC_MARKS 10
5725 #define SYNC_MARK_STEP (3*HZ)
5726 void md_do_sync(mddev_t
*mddev
)
5729 unsigned int currspeed
= 0,
5731 sector_t max_sectors
,j
, io_sectors
;
5732 unsigned long mark
[SYNC_MARKS
];
5733 sector_t mark_cnt
[SYNC_MARKS
];
5735 struct list_head
*tmp
;
5736 sector_t last_check
;
5741 /* just incase thread restarts... */
5742 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5744 if (mddev
->ro
) /* never try to sync a read-only array */
5747 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5748 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5749 desc
= "data-check";
5750 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5751 desc
= "requested-resync";
5754 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5759 /* we overload curr_resync somewhat here.
5760 * 0 == not engaged in resync at all
5761 * 2 == checking that there is no conflict with another sync
5762 * 1 == like 2, but have yielded to allow conflicting resync to
5764 * other == active in resync - this many blocks
5766 * Before starting a resync we must have set curr_resync to
5767 * 2, and then checked that every "conflicting" array has curr_resync
5768 * less than ours. When we find one that is the same or higher
5769 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5770 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5771 * This will mean we have to start checking from the beginning again.
5776 mddev
->curr_resync
= 2;
5779 if (kthread_should_stop()) {
5780 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5783 for_each_mddev(mddev2
, tmp
) {
5784 if (mddev2
== mddev
)
5786 if (!mddev
->parallel_resync
5787 && mddev2
->curr_resync
5788 && match_mddev_units(mddev
, mddev2
)) {
5790 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5791 /* arbitrarily yield */
5792 mddev
->curr_resync
= 1;
5793 wake_up(&resync_wait
);
5795 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5796 /* no need to wait here, we can wait the next
5797 * time 'round when curr_resync == 2
5800 /* We need to wait 'interruptible' so as not to
5801 * contribute to the load average, and not to
5802 * be caught by 'softlockup'
5804 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
5805 if (!kthread_should_stop() &&
5806 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5807 printk(KERN_INFO
"md: delaying %s of %s"
5808 " until %s has finished (they"
5809 " share one or more physical units)\n",
5810 desc
, mdname(mddev
), mdname(mddev2
));
5812 if (signal_pending(current
))
5813 flush_signals(current
);
5815 finish_wait(&resync_wait
, &wq
);
5818 finish_wait(&resync_wait
, &wq
);
5821 } while (mddev
->curr_resync
< 2);
5824 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5825 /* resync follows the size requested by the personality,
5826 * which defaults to physical size, but can be virtual size
5828 max_sectors
= mddev
->resync_max_sectors
;
5829 mddev
->resync_mismatches
= 0;
5830 /* we don't use the checkpoint if there's a bitmap */
5831 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5832 j
= mddev
->resync_min
;
5833 else if (!mddev
->bitmap
)
5834 j
= mddev
->recovery_cp
;
5836 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5837 max_sectors
= mddev
->size
<< 1;
5839 /* recovery follows the physical size of devices */
5840 max_sectors
= mddev
->size
<< 1;
5842 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
5843 if (rdev
->raid_disk
>= 0 &&
5844 !test_bit(Faulty
, &rdev
->flags
) &&
5845 !test_bit(In_sync
, &rdev
->flags
) &&
5846 rdev
->recovery_offset
< j
)
5847 j
= rdev
->recovery_offset
;
5850 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5851 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5852 " %d KB/sec/disk.\n", speed_min(mddev
));
5853 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5854 "(but not more than %d KB/sec) for %s.\n",
5855 speed_max(mddev
), desc
);
5857 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5860 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5862 mark_cnt
[m
] = io_sectors
;
5865 mddev
->resync_mark
= mark
[last_mark
];
5866 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5869 * Tune reconstruction:
5871 window
= 32*(PAGE_SIZE
/512);
5872 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5873 window
/2,(unsigned long long) max_sectors
/2);
5875 atomic_set(&mddev
->recovery_active
, 0);
5880 "md: resuming %s of %s from checkpoint.\n",
5881 desc
, mdname(mddev
));
5882 mddev
->curr_resync
= j
;
5885 while (j
< max_sectors
) {
5889 if (j
>= mddev
->resync_max
) {
5890 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5891 wait_event(mddev
->recovery_wait
,
5892 mddev
->resync_max
> j
5893 || kthread_should_stop());
5895 if (kthread_should_stop())
5897 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5898 currspeed
< speed_min(mddev
));
5900 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5904 if (!skipped
) { /* actual IO requested */
5905 io_sectors
+= sectors
;
5906 atomic_add(sectors
, &mddev
->recovery_active
);
5910 if (j
>1) mddev
->curr_resync
= j
;
5911 mddev
->curr_mark_cnt
= io_sectors
;
5912 if (last_check
== 0)
5913 /* this is the earliers that rebuilt will be
5914 * visible in /proc/mdstat
5916 md_new_event(mddev
);
5918 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5921 last_check
= io_sectors
;
5923 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5927 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5929 int next
= (last_mark
+1) % SYNC_MARKS
;
5931 mddev
->resync_mark
= mark
[next
];
5932 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5933 mark
[next
] = jiffies
;
5934 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5939 if (kthread_should_stop())
5944 * this loop exits only if either when we are slower than
5945 * the 'hard' speed limit, or the system was IO-idle for
5947 * the system might be non-idle CPU-wise, but we only care
5948 * about not overloading the IO subsystem. (things like an
5949 * e2fsck being done on the RAID array should execute fast)
5951 blk_unplug(mddev
->queue
);
5954 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5955 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5957 if (currspeed
> speed_min(mddev
)) {
5958 if ((currspeed
> speed_max(mddev
)) ||
5959 !is_mddev_idle(mddev
)) {
5965 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5967 * this also signals 'finished resyncing' to md_stop
5970 blk_unplug(mddev
->queue
);
5972 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5974 /* tell personality that we are finished */
5975 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5977 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5978 mddev
->curr_resync
> 2) {
5979 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5980 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5981 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5983 "md: checkpointing %s of %s.\n",
5984 desc
, mdname(mddev
));
5985 mddev
->recovery_cp
= mddev
->curr_resync
;
5988 mddev
->recovery_cp
= MaxSector
;
5990 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5991 mddev
->curr_resync
= MaxSector
;
5992 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
5993 if (rdev
->raid_disk
>= 0 &&
5994 !test_bit(Faulty
, &rdev
->flags
) &&
5995 !test_bit(In_sync
, &rdev
->flags
) &&
5996 rdev
->recovery_offset
< mddev
->curr_resync
)
5997 rdev
->recovery_offset
= mddev
->curr_resync
;
6000 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6003 mddev
->curr_resync
= 0;
6004 mddev
->resync_min
= 0;
6005 mddev
->resync_max
= MaxSector
;
6006 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6007 wake_up(&resync_wait
);
6008 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6009 md_wakeup_thread(mddev
->thread
);
6014 * got a signal, exit.
6017 "md: md_do_sync() got signal ... exiting\n");
6018 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6022 EXPORT_SYMBOL_GPL(md_do_sync
);
6025 static int remove_and_add_spares(mddev_t
*mddev
)
6030 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6031 if (rdev
->raid_disk
>= 0 &&
6032 !test_bit(Blocked
, &rdev
->flags
) &&
6033 (test_bit(Faulty
, &rdev
->flags
) ||
6034 ! test_bit(In_sync
, &rdev
->flags
)) &&
6035 atomic_read(&rdev
->nr_pending
)==0) {
6036 if (mddev
->pers
->hot_remove_disk(
6037 mddev
, rdev
->raid_disk
)==0) {
6039 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6040 sysfs_remove_link(&mddev
->kobj
, nm
);
6041 rdev
->raid_disk
= -1;
6045 if (mddev
->degraded
&& ! mddev
->ro
) {
6046 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6047 if (rdev
->raid_disk
>= 0 &&
6048 !test_bit(In_sync
, &rdev
->flags
) &&
6049 !test_bit(Blocked
, &rdev
->flags
))
6051 if (rdev
->raid_disk
< 0
6052 && !test_bit(Faulty
, &rdev
->flags
)) {
6053 rdev
->recovery_offset
= 0;
6055 hot_add_disk(mddev
, rdev
) == 0) {
6057 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6058 if (sysfs_create_link(&mddev
->kobj
,
6061 "md: cannot register "
6065 md_new_event(mddev
);
6074 * This routine is regularly called by all per-raid-array threads to
6075 * deal with generic issues like resync and super-block update.
6076 * Raid personalities that don't have a thread (linear/raid0) do not
6077 * need this as they never do any recovery or update the superblock.
6079 * It does not do any resync itself, but rather "forks" off other threads
6080 * to do that as needed.
6081 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6082 * "->recovery" and create a thread at ->sync_thread.
6083 * When the thread finishes it sets MD_RECOVERY_DONE
6084 * and wakeups up this thread which will reap the thread and finish up.
6085 * This thread also removes any faulty devices (with nr_pending == 0).
6087 * The overall approach is:
6088 * 1/ if the superblock needs updating, update it.
6089 * 2/ If a recovery thread is running, don't do anything else.
6090 * 3/ If recovery has finished, clean up, possibly marking spares active.
6091 * 4/ If there are any faulty devices, remove them.
6092 * 5/ If array is degraded, try to add spares devices
6093 * 6/ If array has spares or is not in-sync, start a resync thread.
6095 void md_check_recovery(mddev_t
*mddev
)
6101 bitmap_daemon_work(mddev
->bitmap
);
6106 if (signal_pending(current
)) {
6107 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6108 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6110 mddev
->safemode
= 2;
6112 flush_signals(current
);
6115 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6118 (mddev
->flags
&& !mddev
->external
) ||
6119 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6120 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6121 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6122 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6123 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6127 if (mddev_trylock(mddev
)) {
6131 /* Only thing we do on a ro array is remove
6134 remove_and_add_spares(mddev
);
6135 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6139 if (!mddev
->external
) {
6141 spin_lock_irq(&mddev
->write_lock
);
6142 if (mddev
->safemode
&&
6143 !atomic_read(&mddev
->writes_pending
) &&
6145 mddev
->recovery_cp
== MaxSector
) {
6148 if (mddev
->persistent
)
6149 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6151 if (mddev
->safemode
== 1)
6152 mddev
->safemode
= 0;
6153 spin_unlock_irq(&mddev
->write_lock
);
6155 sysfs_notify_dirent(mddev
->sysfs_state
);
6159 md_update_sb(mddev
, 0);
6161 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6162 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6163 sysfs_notify_dirent(rdev
->sysfs_state
);
6166 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6167 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6168 /* resync/recovery still happening */
6169 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6172 if (mddev
->sync_thread
) {
6173 /* resync has finished, collect result */
6174 md_unregister_thread(mddev
->sync_thread
);
6175 mddev
->sync_thread
= NULL
;
6176 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6177 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6179 /* activate any spares */
6180 if (mddev
->pers
->spare_active(mddev
))
6181 sysfs_notify(&mddev
->kobj
, NULL
,
6184 md_update_sb(mddev
, 1);
6186 /* if array is no-longer degraded, then any saved_raid_disk
6187 * information must be scrapped
6189 if (!mddev
->degraded
)
6190 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6191 rdev
->saved_raid_disk
= -1;
6193 mddev
->recovery
= 0;
6194 /* flag recovery needed just to double check */
6195 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6196 sysfs_notify_dirent(mddev
->sysfs_action
);
6197 md_new_event(mddev
);
6200 /* Set RUNNING before clearing NEEDED to avoid
6201 * any transients in the value of "sync_action".
6203 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6204 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6205 /* Clear some bits that don't mean anything, but
6208 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6209 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6211 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6213 /* no recovery is running.
6214 * remove any failed drives, then
6215 * add spares if possible.
6216 * Spare are also removed and re-added, to allow
6217 * the personality to fail the re-add.
6220 if (mddev
->reshape_position
!= MaxSector
) {
6221 if (mddev
->pers
->check_reshape(mddev
) != 0)
6222 /* Cannot proceed */
6224 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6225 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6226 } else if ((spares
= remove_and_add_spares(mddev
))) {
6227 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6228 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6229 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6230 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6231 } else if (mddev
->recovery_cp
< MaxSector
) {
6232 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6233 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6234 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6235 /* nothing to be done ... */
6238 if (mddev
->pers
->sync_request
) {
6239 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6240 /* We are adding a device or devices to an array
6241 * which has the bitmap stored on all devices.
6242 * So make sure all bitmap pages get written
6244 bitmap_write_all(mddev
->bitmap
);
6246 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6249 if (!mddev
->sync_thread
) {
6250 printk(KERN_ERR
"%s: could not start resync"
6253 /* leave the spares where they are, it shouldn't hurt */
6254 mddev
->recovery
= 0;
6256 md_wakeup_thread(mddev
->sync_thread
);
6257 sysfs_notify_dirent(mddev
->sysfs_action
);
6258 md_new_event(mddev
);
6261 if (!mddev
->sync_thread
) {
6262 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6263 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6265 if (mddev
->sysfs_action
)
6266 sysfs_notify_dirent(mddev
->sysfs_action
);
6268 mddev_unlock(mddev
);
6272 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6274 sysfs_notify_dirent(rdev
->sysfs_state
);
6275 wait_event_timeout(rdev
->blocked_wait
,
6276 !test_bit(Blocked
, &rdev
->flags
),
6277 msecs_to_jiffies(5000));
6278 rdev_dec_pending(rdev
, mddev
);
6280 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6282 static int md_notify_reboot(struct notifier_block
*this,
6283 unsigned long code
, void *x
)
6285 struct list_head
*tmp
;
6288 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6290 printk(KERN_INFO
"md: stopping all md devices.\n");
6292 for_each_mddev(mddev
, tmp
)
6293 if (mddev_trylock(mddev
)) {
6294 /* Force a switch to readonly even array
6295 * appears to still be in use. Hence
6298 do_md_stop(mddev
, 1, 100);
6299 mddev_unlock(mddev
);
6302 * certain more exotic SCSI devices are known to be
6303 * volatile wrt too early system reboots. While the
6304 * right place to handle this issue is the given
6305 * driver, we do want to have a safe RAID driver ...
6312 static struct notifier_block md_notifier
= {
6313 .notifier_call
= md_notify_reboot
,
6315 .priority
= INT_MAX
, /* before any real devices */
6318 static void md_geninit(void)
6320 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6322 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6325 static int __init
md_init(void)
6327 if (register_blkdev(MAJOR_NR
, "md"))
6329 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6330 unregister_blkdev(MAJOR_NR
, "md");
6333 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6334 md_probe
, NULL
, NULL
);
6335 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6336 md_probe
, NULL
, NULL
);
6338 register_reboot_notifier(&md_notifier
);
6339 raid_table_header
= register_sysctl_table(raid_root_table
);
6349 * Searches all registered partitions for autorun RAID arrays
6353 static LIST_HEAD(all_detected_devices
);
6354 struct detected_devices_node
{
6355 struct list_head list
;
6359 void md_autodetect_dev(dev_t dev
)
6361 struct detected_devices_node
*node_detected_dev
;
6363 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6364 if (node_detected_dev
) {
6365 node_detected_dev
->dev
= dev
;
6366 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6368 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6369 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6374 static void autostart_arrays(int part
)
6377 struct detected_devices_node
*node_detected_dev
;
6379 int i_scanned
, i_passed
;
6384 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6386 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6388 node_detected_dev
= list_entry(all_detected_devices
.next
,
6389 struct detected_devices_node
, list
);
6390 list_del(&node_detected_dev
->list
);
6391 dev
= node_detected_dev
->dev
;
6392 kfree(node_detected_dev
);
6393 rdev
= md_import_device(dev
,0, 90);
6397 if (test_bit(Faulty
, &rdev
->flags
)) {
6401 set_bit(AutoDetected
, &rdev
->flags
);
6402 list_add(&rdev
->same_set
, &pending_raid_disks
);
6406 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6407 i_scanned
, i_passed
);
6409 autorun_devices(part
);
6412 #endif /* !MODULE */
6414 static __exit
void md_exit(void)
6417 struct list_head
*tmp
;
6419 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6420 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6422 unregister_blkdev(MAJOR_NR
,"md");
6423 unregister_blkdev(mdp_major
, "mdp");
6424 unregister_reboot_notifier(&md_notifier
);
6425 unregister_sysctl_table(raid_table_header
);
6426 remove_proc_entry("mdstat", NULL
);
6427 for_each_mddev(mddev
, tmp
) {
6428 struct gendisk
*disk
= mddev
->gendisk
;
6431 export_array(mddev
);
6434 mddev
->gendisk
= NULL
;
6439 subsys_initcall(md_init
);
6440 module_exit(md_exit
)
6442 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6444 return sprintf(buffer
, "%d", start_readonly
);
6446 static int set_ro(const char *val
, struct kernel_param
*kp
)
6449 int num
= simple_strtoul(val
, &e
, 10);
6450 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6451 start_readonly
= num
;
6457 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6458 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6461 EXPORT_SYMBOL(register_md_personality
);
6462 EXPORT_SYMBOL(unregister_md_personality
);
6463 EXPORT_SYMBOL(md_error
);
6464 EXPORT_SYMBOL(md_done_sync
);
6465 EXPORT_SYMBOL(md_write_start
);
6466 EXPORT_SYMBOL(md_write_end
);
6467 EXPORT_SYMBOL(md_register_thread
);
6468 EXPORT_SYMBOL(md_unregister_thread
);
6469 EXPORT_SYMBOL(md_wakeup_thread
);
6470 EXPORT_SYMBOL(md_check_recovery
);
6471 MODULE_LICENSE("GPL");
6473 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);