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_delayed_delete(struct work_struct
*ws
)
219 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
220 kobject_del(&mddev
->kobj
);
221 kobject_put(&mddev
->kobj
);
224 static void mddev_put(mddev_t
*mddev
)
226 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
228 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
229 !mddev
->hold_active
) {
230 list_del(&mddev
->all_mddevs
);
231 if (mddev
->gendisk
) {
232 /* we did a probe so need to clean up.
233 * Call schedule_work inside the spinlock
234 * so that flush_scheduled_work() after
235 * mddev_find will succeed in waiting for the
238 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
239 schedule_work(&mddev
->del_work
);
243 spin_unlock(&all_mddevs_lock
);
246 static mddev_t
* mddev_find(dev_t unit
)
248 mddev_t
*mddev
, *new = NULL
;
251 spin_lock(&all_mddevs_lock
);
254 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
255 if (mddev
->unit
== unit
) {
257 spin_unlock(&all_mddevs_lock
);
263 list_add(&new->all_mddevs
, &all_mddevs
);
264 spin_unlock(&all_mddevs_lock
);
265 new->hold_active
= UNTIL_IOCTL
;
269 /* find an unused unit number */
270 static int next_minor
= 512;
271 int start
= next_minor
;
275 dev
= MKDEV(MD_MAJOR
, next_minor
);
277 if (next_minor
> MINORMASK
)
279 if (next_minor
== start
) {
280 /* Oh dear, all in use. */
281 spin_unlock(&all_mddevs_lock
);
287 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
288 if (mddev
->unit
== dev
) {
294 new->md_minor
= MINOR(dev
);
295 new->hold_active
= UNTIL_STOP
;
296 list_add(&new->all_mddevs
, &all_mddevs
);
297 spin_unlock(&all_mddevs_lock
);
300 spin_unlock(&all_mddevs_lock
);
302 new = kzalloc(sizeof(*new), GFP_KERNEL
);
307 if (MAJOR(unit
) == MD_MAJOR
)
308 new->md_minor
= MINOR(unit
);
310 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
312 mutex_init(&new->reconfig_mutex
);
313 INIT_LIST_HEAD(&new->disks
);
314 INIT_LIST_HEAD(&new->all_mddevs
);
315 init_timer(&new->safemode_timer
);
316 atomic_set(&new->active
, 1);
317 atomic_set(&new->openers
, 0);
318 spin_lock_init(&new->write_lock
);
319 init_waitqueue_head(&new->sb_wait
);
320 init_waitqueue_head(&new->recovery_wait
);
321 new->reshape_position
= MaxSector
;
323 new->resync_max
= MaxSector
;
324 new->level
= LEVEL_NONE
;
329 static inline int mddev_lock(mddev_t
* mddev
)
331 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
334 static inline int mddev_trylock(mddev_t
* mddev
)
336 return mutex_trylock(&mddev
->reconfig_mutex
);
339 static inline void mddev_unlock(mddev_t
* mddev
)
341 mutex_unlock(&mddev
->reconfig_mutex
);
343 md_wakeup_thread(mddev
->thread
);
346 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
350 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
351 if (rdev
->desc_nr
== nr
)
357 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
361 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
362 if (rdev
->bdev
->bd_dev
== dev
)
368 static struct mdk_personality
*find_pers(int level
, char *clevel
)
370 struct mdk_personality
*pers
;
371 list_for_each_entry(pers
, &pers_list
, list
) {
372 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
374 if (strcmp(pers
->name
, clevel
)==0)
380 /* return the offset of the super block in 512byte sectors */
381 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
383 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
384 return MD_NEW_SIZE_SECTORS(num_sectors
);
387 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
389 sector_t num_sectors
= rdev
->sb_start
;
392 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
396 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
401 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
402 if (!rdev
->sb_page
) {
403 printk(KERN_ALERT
"md: out of memory.\n");
410 static void free_disk_sb(mdk_rdev_t
* rdev
)
413 put_page(rdev
->sb_page
);
415 rdev
->sb_page
= NULL
;
422 static void super_written(struct bio
*bio
, int error
)
424 mdk_rdev_t
*rdev
= bio
->bi_private
;
425 mddev_t
*mddev
= rdev
->mddev
;
427 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
428 printk("md: super_written gets error=%d, uptodate=%d\n",
429 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
430 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
431 md_error(mddev
, rdev
);
434 if (atomic_dec_and_test(&mddev
->pending_writes
))
435 wake_up(&mddev
->sb_wait
);
439 static void super_written_barrier(struct bio
*bio
, int error
)
441 struct bio
*bio2
= bio
->bi_private
;
442 mdk_rdev_t
*rdev
= bio2
->bi_private
;
443 mddev_t
*mddev
= rdev
->mddev
;
445 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
446 error
== -EOPNOTSUPP
) {
448 /* barriers don't appear to be supported :-( */
449 set_bit(BarriersNotsupp
, &rdev
->flags
);
450 mddev
->barriers_work
= 0;
451 spin_lock_irqsave(&mddev
->write_lock
, flags
);
452 bio2
->bi_next
= mddev
->biolist
;
453 mddev
->biolist
= bio2
;
454 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
455 wake_up(&mddev
->sb_wait
);
459 bio
->bi_private
= rdev
;
460 super_written(bio
, error
);
464 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
465 sector_t sector
, int size
, struct page
*page
)
467 /* write first size bytes of page to sector of rdev
468 * Increment mddev->pending_writes before returning
469 * and decrement it on completion, waking up sb_wait
470 * if zero is reached.
471 * If an error occurred, call md_error
473 * As we might need to resubmit the request if BIO_RW_BARRIER
474 * causes ENOTSUPP, we allocate a spare bio...
476 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
477 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
479 bio
->bi_bdev
= rdev
->bdev
;
480 bio
->bi_sector
= sector
;
481 bio_add_page(bio
, page
, size
, 0);
482 bio
->bi_private
= rdev
;
483 bio
->bi_end_io
= super_written
;
486 atomic_inc(&mddev
->pending_writes
);
487 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
489 rw
|= (1<<BIO_RW_BARRIER
);
490 rbio
= bio_clone(bio
, GFP_NOIO
);
491 rbio
->bi_private
= bio
;
492 rbio
->bi_end_io
= super_written_barrier
;
493 submit_bio(rw
, rbio
);
498 void md_super_wait(mddev_t
*mddev
)
500 /* wait for all superblock writes that were scheduled to complete.
501 * if any had to be retried (due to BARRIER problems), retry them
505 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
506 if (atomic_read(&mddev
->pending_writes
)==0)
508 while (mddev
->biolist
) {
510 spin_lock_irq(&mddev
->write_lock
);
511 bio
= mddev
->biolist
;
512 mddev
->biolist
= bio
->bi_next
;
514 spin_unlock_irq(&mddev
->write_lock
);
515 submit_bio(bio
->bi_rw
, bio
);
519 finish_wait(&mddev
->sb_wait
, &wq
);
522 static void bi_complete(struct bio
*bio
, int error
)
524 complete((struct completion
*)bio
->bi_private
);
527 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
528 struct page
*page
, int rw
)
530 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
531 struct completion event
;
534 rw
|= (1 << BIO_RW_SYNC
);
537 bio
->bi_sector
= sector
;
538 bio_add_page(bio
, page
, size
, 0);
539 init_completion(&event
);
540 bio
->bi_private
= &event
;
541 bio
->bi_end_io
= bi_complete
;
543 wait_for_completion(&event
);
545 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
549 EXPORT_SYMBOL_GPL(sync_page_io
);
551 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
553 char b
[BDEVNAME_SIZE
];
554 if (!rdev
->sb_page
) {
562 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
568 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
569 bdevname(rdev
->bdev
,b
));
573 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
575 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
576 sb1
->set_uuid1
== sb2
->set_uuid1
&&
577 sb1
->set_uuid2
== sb2
->set_uuid2
&&
578 sb1
->set_uuid3
== sb2
->set_uuid3
;
581 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
584 mdp_super_t
*tmp1
, *tmp2
;
586 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
587 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
589 if (!tmp1
|| !tmp2
) {
591 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
599 * nr_disks is not constant
604 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
612 static u32
md_csum_fold(u32 csum
)
614 csum
= (csum
& 0xffff) + (csum
>> 16);
615 return (csum
& 0xffff) + (csum
>> 16);
618 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
621 u32
*sb32
= (u32
*)sb
;
623 unsigned int disk_csum
, csum
;
625 disk_csum
= sb
->sb_csum
;
628 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
630 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
634 /* This used to use csum_partial, which was wrong for several
635 * reasons including that different results are returned on
636 * different architectures. It isn't critical that we get exactly
637 * the same return value as before (we always csum_fold before
638 * testing, and that removes any differences). However as we
639 * know that csum_partial always returned a 16bit value on
640 * alphas, do a fold to maximise conformity to previous behaviour.
642 sb
->sb_csum
= md_csum_fold(disk_csum
);
644 sb
->sb_csum
= disk_csum
;
651 * Handle superblock details.
652 * We want to be able to handle multiple superblock formats
653 * so we have a common interface to them all, and an array of
654 * different handlers.
655 * We rely on user-space to write the initial superblock, and support
656 * reading and updating of superblocks.
657 * Interface methods are:
658 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
659 * loads and validates a superblock on dev.
660 * if refdev != NULL, compare superblocks on both devices
662 * 0 - dev has a superblock that is compatible with refdev
663 * 1 - dev has a superblock that is compatible and newer than refdev
664 * so dev should be used as the refdev in future
665 * -EINVAL superblock incompatible or invalid
666 * -othererror e.g. -EIO
668 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
669 * Verify that dev is acceptable into mddev.
670 * The first time, mddev->raid_disks will be 0, and data from
671 * dev should be merged in. Subsequent calls check that dev
672 * is new enough. Return 0 or -EINVAL
674 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
675 * Update the superblock for rdev with data in mddev
676 * This does not write to disc.
682 struct module
*owner
;
683 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
685 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
686 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
687 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
688 sector_t num_sectors
);
692 * load_super for 0.90.0
694 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
696 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
701 * Calculate the position of the superblock (512byte sectors),
702 * it's at the end of the disk.
704 * It also happens to be a multiple of 4Kb.
706 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
708 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
713 bdevname(rdev
->bdev
, b
);
714 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
716 if (sb
->md_magic
!= MD_SB_MAGIC
) {
717 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
722 if (sb
->major_version
!= 0 ||
723 sb
->minor_version
< 90 ||
724 sb
->minor_version
> 91) {
725 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
726 sb
->major_version
, sb
->minor_version
,
731 if (sb
->raid_disks
<= 0)
734 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
735 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
740 rdev
->preferred_minor
= sb
->md_minor
;
741 rdev
->data_offset
= 0;
742 rdev
->sb_size
= MD_SB_BYTES
;
744 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
745 if (sb
->level
!= 1 && sb
->level
!= 4
746 && sb
->level
!= 5 && sb
->level
!= 6
747 && sb
->level
!= 10) {
748 /* FIXME use a better test */
750 "md: bitmaps not supported for this level.\n");
755 if (sb
->level
== LEVEL_MULTIPATH
)
758 rdev
->desc_nr
= sb
->this_disk
.number
;
764 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
765 if (!uuid_equal(refsb
, sb
)) {
766 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
767 b
, bdevname(refdev
->bdev
,b2
));
770 if (!sb_equal(refsb
, sb
)) {
771 printk(KERN_WARNING
"md: %s has same UUID"
772 " but different superblock to %s\n",
773 b
, bdevname(refdev
->bdev
, b2
));
777 ev2
= md_event(refsb
);
783 rdev
->size
= calc_num_sectors(rdev
, sb
->chunk_size
) / 2;
785 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
786 /* "this cannot possibly happen" ... */
794 * validate_super for 0.90.0
796 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
799 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
800 __u64 ev1
= md_event(sb
);
802 rdev
->raid_disk
= -1;
803 clear_bit(Faulty
, &rdev
->flags
);
804 clear_bit(In_sync
, &rdev
->flags
);
805 clear_bit(WriteMostly
, &rdev
->flags
);
806 clear_bit(BarriersNotsupp
, &rdev
->flags
);
808 if (mddev
->raid_disks
== 0) {
809 mddev
->major_version
= 0;
810 mddev
->minor_version
= sb
->minor_version
;
811 mddev
->patch_version
= sb
->patch_version
;
813 mddev
->chunk_size
= sb
->chunk_size
;
814 mddev
->ctime
= sb
->ctime
;
815 mddev
->utime
= sb
->utime
;
816 mddev
->level
= sb
->level
;
817 mddev
->clevel
[0] = 0;
818 mddev
->layout
= sb
->layout
;
819 mddev
->raid_disks
= sb
->raid_disks
;
820 mddev
->size
= sb
->size
;
822 mddev
->bitmap_offset
= 0;
823 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
825 if (mddev
->minor_version
>= 91) {
826 mddev
->reshape_position
= sb
->reshape_position
;
827 mddev
->delta_disks
= sb
->delta_disks
;
828 mddev
->new_level
= sb
->new_level
;
829 mddev
->new_layout
= sb
->new_layout
;
830 mddev
->new_chunk
= sb
->new_chunk
;
832 mddev
->reshape_position
= MaxSector
;
833 mddev
->delta_disks
= 0;
834 mddev
->new_level
= mddev
->level
;
835 mddev
->new_layout
= mddev
->layout
;
836 mddev
->new_chunk
= mddev
->chunk_size
;
839 if (sb
->state
& (1<<MD_SB_CLEAN
))
840 mddev
->recovery_cp
= MaxSector
;
842 if (sb
->events_hi
== sb
->cp_events_hi
&&
843 sb
->events_lo
== sb
->cp_events_lo
) {
844 mddev
->recovery_cp
= sb
->recovery_cp
;
846 mddev
->recovery_cp
= 0;
849 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
850 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
851 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
852 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
854 mddev
->max_disks
= MD_SB_DISKS
;
856 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
857 mddev
->bitmap_file
== NULL
)
858 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
860 } else if (mddev
->pers
== NULL
) {
861 /* Insist on good event counter while assembling */
863 if (ev1
< mddev
->events
)
865 } else if (mddev
->bitmap
) {
866 /* if adding to array with a bitmap, then we can accept an
867 * older device ... but not too old.
869 if (ev1
< mddev
->bitmap
->events_cleared
)
872 if (ev1
< mddev
->events
)
873 /* just a hot-add of a new device, leave raid_disk at -1 */
877 if (mddev
->level
!= LEVEL_MULTIPATH
) {
878 desc
= sb
->disks
+ rdev
->desc_nr
;
880 if (desc
->state
& (1<<MD_DISK_FAULTY
))
881 set_bit(Faulty
, &rdev
->flags
);
882 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
883 desc->raid_disk < mddev->raid_disks */) {
884 set_bit(In_sync
, &rdev
->flags
);
885 rdev
->raid_disk
= desc
->raid_disk
;
887 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
888 set_bit(WriteMostly
, &rdev
->flags
);
889 } else /* MULTIPATH are always insync */
890 set_bit(In_sync
, &rdev
->flags
);
895 * sync_super for 0.90.0
897 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
901 int next_spare
= mddev
->raid_disks
;
904 /* make rdev->sb match mddev data..
907 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
908 * 3/ any empty disks < next_spare become removed
910 * disks[0] gets initialised to REMOVED because
911 * we cannot be sure from other fields if it has
912 * been initialised or not.
915 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
917 rdev
->sb_size
= MD_SB_BYTES
;
919 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
921 memset(sb
, 0, sizeof(*sb
));
923 sb
->md_magic
= MD_SB_MAGIC
;
924 sb
->major_version
= mddev
->major_version
;
925 sb
->patch_version
= mddev
->patch_version
;
926 sb
->gvalid_words
= 0; /* ignored */
927 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
928 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
929 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
930 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
932 sb
->ctime
= mddev
->ctime
;
933 sb
->level
= mddev
->level
;
934 sb
->size
= mddev
->size
;
935 sb
->raid_disks
= mddev
->raid_disks
;
936 sb
->md_minor
= mddev
->md_minor
;
937 sb
->not_persistent
= 0;
938 sb
->utime
= mddev
->utime
;
940 sb
->events_hi
= (mddev
->events
>>32);
941 sb
->events_lo
= (u32
)mddev
->events
;
943 if (mddev
->reshape_position
== MaxSector
)
944 sb
->minor_version
= 90;
946 sb
->minor_version
= 91;
947 sb
->reshape_position
= mddev
->reshape_position
;
948 sb
->new_level
= mddev
->new_level
;
949 sb
->delta_disks
= mddev
->delta_disks
;
950 sb
->new_layout
= mddev
->new_layout
;
951 sb
->new_chunk
= mddev
->new_chunk
;
953 mddev
->minor_version
= sb
->minor_version
;
956 sb
->recovery_cp
= mddev
->recovery_cp
;
957 sb
->cp_events_hi
= (mddev
->events
>>32);
958 sb
->cp_events_lo
= (u32
)mddev
->events
;
959 if (mddev
->recovery_cp
== MaxSector
)
960 sb
->state
= (1<< MD_SB_CLEAN
);
964 sb
->layout
= mddev
->layout
;
965 sb
->chunk_size
= mddev
->chunk_size
;
967 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
968 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
970 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
971 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
974 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
975 && !test_bit(Faulty
, &rdev2
->flags
))
976 desc_nr
= rdev2
->raid_disk
;
978 desc_nr
= next_spare
++;
979 rdev2
->desc_nr
= desc_nr
;
980 d
= &sb
->disks
[rdev2
->desc_nr
];
982 d
->number
= rdev2
->desc_nr
;
983 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
984 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
985 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
986 && !test_bit(Faulty
, &rdev2
->flags
))
987 d
->raid_disk
= rdev2
->raid_disk
;
989 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
990 if (test_bit(Faulty
, &rdev2
->flags
))
991 d
->state
= (1<<MD_DISK_FAULTY
);
992 else if (test_bit(In_sync
, &rdev2
->flags
)) {
993 d
->state
= (1<<MD_DISK_ACTIVE
);
994 d
->state
|= (1<<MD_DISK_SYNC
);
1002 if (test_bit(WriteMostly
, &rdev2
->flags
))
1003 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1005 /* now set the "removed" and "faulty" bits on any missing devices */
1006 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1007 mdp_disk_t
*d
= &sb
->disks
[i
];
1008 if (d
->state
== 0 && d
->number
== 0) {
1011 d
->state
= (1<<MD_DISK_REMOVED
);
1012 d
->state
|= (1<<MD_DISK_FAULTY
);
1016 sb
->nr_disks
= nr_disks
;
1017 sb
->active_disks
= active
;
1018 sb
->working_disks
= working
;
1019 sb
->failed_disks
= failed
;
1020 sb
->spare_disks
= spare
;
1022 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1023 sb
->sb_csum
= calc_sb_csum(sb
);
1027 * rdev_size_change for 0.90.0
1029 static unsigned long long
1030 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1032 if (num_sectors
&& num_sectors
< rdev
->mddev
->size
* 2)
1033 return 0; /* component must fit device */
1034 if (rdev
->mddev
->bitmap_offset
)
1035 return 0; /* can't move bitmap */
1036 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1037 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1038 num_sectors
= rdev
->sb_start
;
1039 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1041 md_super_wait(rdev
->mddev
);
1042 return num_sectors
/ 2; /* kB for sysfs */
1047 * version 1 superblock
1050 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1054 unsigned long long newcsum
;
1055 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1056 __le32
*isuper
= (__le32
*)sb
;
1059 disk_csum
= sb
->sb_csum
;
1062 for (i
=0; size
>=4; size
-= 4 )
1063 newcsum
+= le32_to_cpu(*isuper
++);
1066 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1068 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1069 sb
->sb_csum
= disk_csum
;
1070 return cpu_to_le32(csum
);
1073 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1075 struct mdp_superblock_1
*sb
;
1078 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1082 * Calculate the position of the superblock in 512byte sectors.
1083 * It is always aligned to a 4K boundary and
1084 * depeding on minor_version, it can be:
1085 * 0: At least 8K, but less than 12K, from end of device
1086 * 1: At start of device
1087 * 2: 4K from start of device.
1089 switch(minor_version
) {
1091 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1093 sb_start
&= ~(sector_t
)(4*2-1);
1104 rdev
->sb_start
= sb_start
;
1106 /* superblock is rarely larger than 1K, but it can be larger,
1107 * and it is safe to read 4k, so we do that
1109 ret
= read_disk_sb(rdev
, 4096);
1110 if (ret
) return ret
;
1113 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1115 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1116 sb
->major_version
!= cpu_to_le32(1) ||
1117 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1118 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1119 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1122 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1123 printk("md: invalid superblock checksum on %s\n",
1124 bdevname(rdev
->bdev
,b
));
1127 if (le64_to_cpu(sb
->data_size
) < 10) {
1128 printk("md: data_size too small on %s\n",
1129 bdevname(rdev
->bdev
,b
));
1132 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1133 if (sb
->level
!= cpu_to_le32(1) &&
1134 sb
->level
!= cpu_to_le32(4) &&
1135 sb
->level
!= cpu_to_le32(5) &&
1136 sb
->level
!= cpu_to_le32(6) &&
1137 sb
->level
!= cpu_to_le32(10)) {
1139 "md: bitmaps not supported for this level.\n");
1144 rdev
->preferred_minor
= 0xffff;
1145 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1146 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1148 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1149 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1150 if (rdev
->sb_size
& bmask
)
1151 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1154 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1157 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1160 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1166 struct mdp_superblock_1
*refsb
=
1167 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1169 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1170 sb
->level
!= refsb
->level
||
1171 sb
->layout
!= refsb
->layout
||
1172 sb
->chunksize
!= refsb
->chunksize
) {
1173 printk(KERN_WARNING
"md: %s has strangely different"
1174 " superblock to %s\n",
1175 bdevname(rdev
->bdev
,b
),
1176 bdevname(refdev
->bdev
,b2
));
1179 ev1
= le64_to_cpu(sb
->events
);
1180 ev2
= le64_to_cpu(refsb
->events
);
1188 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1190 rdev
->size
= rdev
->sb_start
/ 2;
1191 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1193 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1194 if (le32_to_cpu(sb
->chunksize
))
1195 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1197 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1202 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1204 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1205 __u64 ev1
= le64_to_cpu(sb
->events
);
1207 rdev
->raid_disk
= -1;
1208 clear_bit(Faulty
, &rdev
->flags
);
1209 clear_bit(In_sync
, &rdev
->flags
);
1210 clear_bit(WriteMostly
, &rdev
->flags
);
1211 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1213 if (mddev
->raid_disks
== 0) {
1214 mddev
->major_version
= 1;
1215 mddev
->patch_version
= 0;
1216 mddev
->external
= 0;
1217 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1218 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1219 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1220 mddev
->level
= le32_to_cpu(sb
->level
);
1221 mddev
->clevel
[0] = 0;
1222 mddev
->layout
= le32_to_cpu(sb
->layout
);
1223 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1224 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1225 mddev
->events
= ev1
;
1226 mddev
->bitmap_offset
= 0;
1227 mddev
->default_bitmap_offset
= 1024 >> 9;
1229 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1230 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1232 mddev
->max_disks
= (4096-256)/2;
1234 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1235 mddev
->bitmap_file
== NULL
)
1236 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1238 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1239 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1240 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1241 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1242 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1243 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1245 mddev
->reshape_position
= MaxSector
;
1246 mddev
->delta_disks
= 0;
1247 mddev
->new_level
= mddev
->level
;
1248 mddev
->new_layout
= mddev
->layout
;
1249 mddev
->new_chunk
= mddev
->chunk_size
;
1252 } else if (mddev
->pers
== NULL
) {
1253 /* Insist of good event counter while assembling */
1255 if (ev1
< mddev
->events
)
1257 } else if (mddev
->bitmap
) {
1258 /* If adding to array with a bitmap, then we can accept an
1259 * older device, but not too old.
1261 if (ev1
< mddev
->bitmap
->events_cleared
)
1264 if (ev1
< mddev
->events
)
1265 /* just a hot-add of a new device, leave raid_disk at -1 */
1268 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1270 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1272 case 0xffff: /* spare */
1274 case 0xfffe: /* faulty */
1275 set_bit(Faulty
, &rdev
->flags
);
1278 if ((le32_to_cpu(sb
->feature_map
) &
1279 MD_FEATURE_RECOVERY_OFFSET
))
1280 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1282 set_bit(In_sync
, &rdev
->flags
);
1283 rdev
->raid_disk
= role
;
1286 if (sb
->devflags
& WriteMostly1
)
1287 set_bit(WriteMostly
, &rdev
->flags
);
1288 } else /* MULTIPATH are always insync */
1289 set_bit(In_sync
, &rdev
->flags
);
1294 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1296 struct mdp_superblock_1
*sb
;
1299 /* make rdev->sb match mddev and rdev data. */
1301 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1303 sb
->feature_map
= 0;
1305 sb
->recovery_offset
= cpu_to_le64(0);
1306 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1307 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1308 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1310 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1311 sb
->events
= cpu_to_le64(mddev
->events
);
1313 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1315 sb
->resync_offset
= cpu_to_le64(0);
1317 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1319 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1320 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1322 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1323 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1324 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1327 if (rdev
->raid_disk
>= 0 &&
1328 !test_bit(In_sync
, &rdev
->flags
) &&
1329 rdev
->recovery_offset
> 0) {
1330 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1331 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1334 if (mddev
->reshape_position
!= MaxSector
) {
1335 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1336 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1337 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1338 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1339 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1340 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1344 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1345 if (rdev2
->desc_nr
+1 > max_dev
)
1346 max_dev
= rdev2
->desc_nr
+1;
1348 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1349 sb
->max_dev
= cpu_to_le32(max_dev
);
1350 for (i
=0; i
<max_dev
;i
++)
1351 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1353 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1355 if (test_bit(Faulty
, &rdev2
->flags
))
1356 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1357 else if (test_bit(In_sync
, &rdev2
->flags
))
1358 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1359 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1360 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1362 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1365 sb
->sb_csum
= calc_sb_1_csum(sb
);
1368 static unsigned long long
1369 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1371 struct mdp_superblock_1
*sb
;
1372 sector_t max_sectors
;
1373 if (num_sectors
&& num_sectors
< rdev
->mddev
->size
* 2)
1374 return 0; /* component must fit device */
1375 if (rdev
->sb_start
< rdev
->data_offset
) {
1376 /* minor versions 1 and 2; superblock before data */
1377 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1378 max_sectors
-= rdev
->data_offset
;
1379 if (!num_sectors
|| num_sectors
> max_sectors
)
1380 num_sectors
= max_sectors
;
1381 } else if (rdev
->mddev
->bitmap_offset
) {
1382 /* minor version 0 with bitmap we can't move */
1385 /* minor version 0; superblock after data */
1387 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1388 sb_start
&= ~(sector_t
)(4*2 - 1);
1389 max_sectors
= rdev
->size
* 2 + sb_start
- rdev
->sb_start
;
1390 if (!num_sectors
|| num_sectors
> max_sectors
)
1391 num_sectors
= max_sectors
;
1392 rdev
->sb_start
= sb_start
;
1394 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1395 sb
->data_size
= cpu_to_le64(num_sectors
);
1396 sb
->super_offset
= rdev
->sb_start
;
1397 sb
->sb_csum
= calc_sb_1_csum(sb
);
1398 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1400 md_super_wait(rdev
->mddev
);
1401 return num_sectors
/ 2; /* kB for sysfs */
1404 static struct super_type super_types
[] = {
1407 .owner
= THIS_MODULE
,
1408 .load_super
= super_90_load
,
1409 .validate_super
= super_90_validate
,
1410 .sync_super
= super_90_sync
,
1411 .rdev_size_change
= super_90_rdev_size_change
,
1415 .owner
= THIS_MODULE
,
1416 .load_super
= super_1_load
,
1417 .validate_super
= super_1_validate
,
1418 .sync_super
= super_1_sync
,
1419 .rdev_size_change
= super_1_rdev_size_change
,
1423 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1425 mdk_rdev_t
*rdev
, *rdev2
;
1428 rdev_for_each_rcu(rdev
, mddev1
)
1429 rdev_for_each_rcu(rdev2
, mddev2
)
1430 if (rdev
->bdev
->bd_contains
==
1431 rdev2
->bdev
->bd_contains
) {
1439 static LIST_HEAD(pending_raid_disks
);
1441 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1443 char b
[BDEVNAME_SIZE
];
1453 /* prevent duplicates */
1454 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1457 /* make sure rdev->size exceeds mddev->size */
1458 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1460 /* Cannot change size, so fail
1461 * If mddev->level <= 0, then we don't care
1462 * about aligning sizes (e.g. linear)
1464 if (mddev
->level
> 0)
1467 mddev
->size
= rdev
->size
;
1470 /* Verify rdev->desc_nr is unique.
1471 * If it is -1, assign a free number, else
1472 * check number is not in use
1474 if (rdev
->desc_nr
< 0) {
1476 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1477 while (find_rdev_nr(mddev
, choice
))
1479 rdev
->desc_nr
= choice
;
1481 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1484 bdevname(rdev
->bdev
,b
);
1485 while ( (s
=strchr(b
, '/')) != NULL
)
1488 rdev
->mddev
= mddev
;
1489 printk(KERN_INFO
"md: bind<%s>\n", b
);
1491 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1494 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1495 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1496 kobject_del(&rdev
->kobj
);
1499 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1501 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1502 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1504 /* May as well allow recovery to be retried once */
1505 mddev
->recovery_disabled
= 0;
1509 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1514 static void md_delayed_delete(struct work_struct
*ws
)
1516 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1517 kobject_del(&rdev
->kobj
);
1518 kobject_put(&rdev
->kobj
);
1521 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1523 char b
[BDEVNAME_SIZE
];
1528 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1529 list_del_rcu(&rdev
->same_set
);
1530 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1532 sysfs_remove_link(&rdev
->kobj
, "block");
1533 sysfs_put(rdev
->sysfs_state
);
1534 rdev
->sysfs_state
= NULL
;
1535 /* We need to delay this, otherwise we can deadlock when
1536 * writing to 'remove' to "dev/state". We also need
1537 * to delay it due to rcu usage.
1540 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1541 kobject_get(&rdev
->kobj
);
1542 schedule_work(&rdev
->del_work
);
1546 * prevent the device from being mounted, repartitioned or
1547 * otherwise reused by a RAID array (or any other kernel
1548 * subsystem), by bd_claiming the device.
1550 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1553 struct block_device
*bdev
;
1554 char b
[BDEVNAME_SIZE
];
1556 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1558 printk(KERN_ERR
"md: could not open %s.\n",
1559 __bdevname(dev
, b
));
1560 return PTR_ERR(bdev
);
1562 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1564 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1566 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1570 set_bit(AllReserved
, &rdev
->flags
);
1575 static void unlock_rdev(mdk_rdev_t
*rdev
)
1577 struct block_device
*bdev
= rdev
->bdev
;
1582 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1585 void md_autodetect_dev(dev_t dev
);
1587 static void export_rdev(mdk_rdev_t
* rdev
)
1589 char b
[BDEVNAME_SIZE
];
1590 printk(KERN_INFO
"md: export_rdev(%s)\n",
1591 bdevname(rdev
->bdev
,b
));
1596 if (test_bit(AutoDetected
, &rdev
->flags
))
1597 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1600 kobject_put(&rdev
->kobj
);
1603 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1605 unbind_rdev_from_array(rdev
);
1609 static void export_array(mddev_t
*mddev
)
1611 mdk_rdev_t
*rdev
, *tmp
;
1613 rdev_for_each(rdev
, tmp
, mddev
) {
1618 kick_rdev_from_array(rdev
);
1620 if (!list_empty(&mddev
->disks
))
1622 mddev
->raid_disks
= 0;
1623 mddev
->major_version
= 0;
1626 static void print_desc(mdp_disk_t
*desc
)
1628 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1629 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1632 static void print_sb_90(mdp_super_t
*sb
)
1637 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1638 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1639 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1641 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1642 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1643 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1644 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1645 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1646 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1647 sb
->failed_disks
, sb
->spare_disks
,
1648 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1651 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1654 desc
= sb
->disks
+ i
;
1655 if (desc
->number
|| desc
->major
|| desc
->minor
||
1656 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1657 printk(" D %2d: ", i
);
1661 printk(KERN_INFO
"md: THIS: ");
1662 print_desc(&sb
->this_disk
);
1665 static void print_sb_1(struct mdp_superblock_1
*sb
)
1669 uuid
= sb
->set_uuid
;
1670 printk(KERN_INFO
"md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1671 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1672 KERN_INFO
"md: Name: \"%s\" CT:%llu\n",
1673 le32_to_cpu(sb
->major_version
),
1674 le32_to_cpu(sb
->feature_map
),
1675 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1676 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1677 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1678 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1680 (unsigned long long)le64_to_cpu(sb
->ctime
)
1681 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1683 uuid
= sb
->device_uuid
;
1684 printk(KERN_INFO
"md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1686 KERN_INFO
"md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1687 ":%02x%02x%02x%02x%02x%02x\n"
1688 KERN_INFO
"md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1689 KERN_INFO
"md: (MaxDev:%u) \n",
1690 le32_to_cpu(sb
->level
),
1691 (unsigned long long)le64_to_cpu(sb
->size
),
1692 le32_to_cpu(sb
->raid_disks
),
1693 le32_to_cpu(sb
->layout
),
1694 le32_to_cpu(sb
->chunksize
),
1695 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1696 (unsigned long long)le64_to_cpu(sb
->data_size
),
1697 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1698 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1699 le32_to_cpu(sb
->dev_number
),
1700 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1701 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1702 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1703 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1705 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1706 (unsigned long long)le64_to_cpu(sb
->events
),
1707 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1708 le32_to_cpu(sb
->sb_csum
),
1709 le32_to_cpu(sb
->max_dev
)
1713 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1715 char b
[BDEVNAME_SIZE
];
1716 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1717 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1718 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1720 if (rdev
->sb_loaded
) {
1721 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1722 switch (major_version
) {
1724 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1727 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
1731 printk(KERN_INFO
"md: no rdev superblock!\n");
1734 static void md_print_devices(void)
1736 struct list_head
*tmp
;
1739 char b
[BDEVNAME_SIZE
];
1742 printk("md: **********************************\n");
1743 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1744 printk("md: **********************************\n");
1745 for_each_mddev(mddev
, tmp
) {
1748 bitmap_print_sb(mddev
->bitmap
);
1750 printk("%s: ", mdname(mddev
));
1751 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1752 printk("<%s>", bdevname(rdev
->bdev
,b
));
1755 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1756 print_rdev(rdev
, mddev
->major_version
);
1758 printk("md: **********************************\n");
1763 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1765 /* Update each superblock (in-memory image), but
1766 * if we are allowed to, skip spares which already
1767 * have the right event counter, or have one earlier
1768 * (which would mean they aren't being marked as dirty
1769 * with the rest of the array)
1773 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1774 if (rdev
->sb_events
== mddev
->events
||
1776 rdev
->raid_disk
< 0 &&
1777 (rdev
->sb_events
&1)==0 &&
1778 rdev
->sb_events
+1 == mddev
->events
)) {
1779 /* Don't update this superblock */
1780 rdev
->sb_loaded
= 2;
1782 super_types
[mddev
->major_version
].
1783 sync_super(mddev
, rdev
);
1784 rdev
->sb_loaded
= 1;
1789 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1795 if (mddev
->external
)
1798 spin_lock_irq(&mddev
->write_lock
);
1800 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1801 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1803 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1804 /* just a clean<-> dirty transition, possibly leave spares alone,
1805 * though if events isn't the right even/odd, we will have to do
1811 if (mddev
->degraded
)
1812 /* If the array is degraded, then skipping spares is both
1813 * dangerous and fairly pointless.
1814 * Dangerous because a device that was removed from the array
1815 * might have a event_count that still looks up-to-date,
1816 * so it can be re-added without a resync.
1817 * Pointless because if there are any spares to skip,
1818 * then a recovery will happen and soon that array won't
1819 * be degraded any more and the spare can go back to sleep then.
1823 sync_req
= mddev
->in_sync
;
1824 mddev
->utime
= get_seconds();
1826 /* If this is just a dirty<->clean transition, and the array is clean
1827 * and 'events' is odd, we can roll back to the previous clean state */
1829 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1830 && (mddev
->events
& 1)
1831 && mddev
->events
!= 1)
1834 /* otherwise we have to go forward and ... */
1836 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1837 /* .. if the array isn't clean, insist on an odd 'events' */
1838 if ((mddev
->events
&1)==0) {
1843 /* otherwise insist on an even 'events' (for clean states) */
1844 if ((mddev
->events
&1)) {
1851 if (!mddev
->events
) {
1853 * oops, this 64-bit counter should never wrap.
1854 * Either we are in around ~1 trillion A.C., assuming
1855 * 1 reboot per second, or we have a bug:
1862 * do not write anything to disk if using
1863 * nonpersistent superblocks
1865 if (!mddev
->persistent
) {
1866 if (!mddev
->external
)
1867 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1869 spin_unlock_irq(&mddev
->write_lock
);
1870 wake_up(&mddev
->sb_wait
);
1873 sync_sbs(mddev
, nospares
);
1874 spin_unlock_irq(&mddev
->write_lock
);
1877 "md: updating %s RAID superblock on device (in sync %d)\n",
1878 mdname(mddev
),mddev
->in_sync
);
1880 bitmap_update_sb(mddev
->bitmap
);
1881 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1882 char b
[BDEVNAME_SIZE
];
1883 dprintk(KERN_INFO
"md: ");
1884 if (rdev
->sb_loaded
!= 1)
1885 continue; /* no noise on spare devices */
1886 if (test_bit(Faulty
, &rdev
->flags
))
1887 dprintk("(skipping faulty ");
1889 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1890 if (!test_bit(Faulty
, &rdev
->flags
)) {
1891 md_super_write(mddev
,rdev
,
1892 rdev
->sb_start
, rdev
->sb_size
,
1894 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1895 bdevname(rdev
->bdev
,b
),
1896 (unsigned long long)rdev
->sb_start
);
1897 rdev
->sb_events
= mddev
->events
;
1901 if (mddev
->level
== LEVEL_MULTIPATH
)
1902 /* only need to write one superblock... */
1905 md_super_wait(mddev
);
1906 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1908 spin_lock_irq(&mddev
->write_lock
);
1909 if (mddev
->in_sync
!= sync_req
||
1910 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1911 /* have to write it out again */
1912 spin_unlock_irq(&mddev
->write_lock
);
1915 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1916 spin_unlock_irq(&mddev
->write_lock
);
1917 wake_up(&mddev
->sb_wait
);
1921 /* words written to sysfs files may, or may not, be \n terminated.
1922 * We want to accept with case. For this we use cmd_match.
1924 static int cmd_match(const char *cmd
, const char *str
)
1926 /* See if cmd, written into a sysfs file, matches
1927 * str. They must either be the same, or cmd can
1928 * have a trailing newline
1930 while (*cmd
&& *str
&& *cmd
== *str
) {
1941 struct rdev_sysfs_entry
{
1942 struct attribute attr
;
1943 ssize_t (*show
)(mdk_rdev_t
*, char *);
1944 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1948 state_show(mdk_rdev_t
*rdev
, char *page
)
1953 if (test_bit(Faulty
, &rdev
->flags
)) {
1954 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1957 if (test_bit(In_sync
, &rdev
->flags
)) {
1958 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1961 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1962 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1965 if (test_bit(Blocked
, &rdev
->flags
)) {
1966 len
+= sprintf(page
+len
, "%sblocked", sep
);
1969 if (!test_bit(Faulty
, &rdev
->flags
) &&
1970 !test_bit(In_sync
, &rdev
->flags
)) {
1971 len
+= sprintf(page
+len
, "%sspare", sep
);
1974 return len
+sprintf(page
+len
, "\n");
1978 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1981 * faulty - simulates and error
1982 * remove - disconnects the device
1983 * writemostly - sets write_mostly
1984 * -writemostly - clears write_mostly
1985 * blocked - sets the Blocked flag
1986 * -blocked - clears the Blocked flag
1989 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1990 md_error(rdev
->mddev
, rdev
);
1992 } else if (cmd_match(buf
, "remove")) {
1993 if (rdev
->raid_disk
>= 0)
1996 mddev_t
*mddev
= rdev
->mddev
;
1997 kick_rdev_from_array(rdev
);
1999 md_update_sb(mddev
, 1);
2000 md_new_event(mddev
);
2003 } else if (cmd_match(buf
, "writemostly")) {
2004 set_bit(WriteMostly
, &rdev
->flags
);
2006 } else if (cmd_match(buf
, "-writemostly")) {
2007 clear_bit(WriteMostly
, &rdev
->flags
);
2009 } else if (cmd_match(buf
, "blocked")) {
2010 set_bit(Blocked
, &rdev
->flags
);
2012 } else if (cmd_match(buf
, "-blocked")) {
2013 clear_bit(Blocked
, &rdev
->flags
);
2014 wake_up(&rdev
->blocked_wait
);
2015 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2016 md_wakeup_thread(rdev
->mddev
->thread
);
2020 if (!err
&& rdev
->sysfs_state
)
2021 sysfs_notify_dirent(rdev
->sysfs_state
);
2022 return err
? err
: len
;
2024 static struct rdev_sysfs_entry rdev_state
=
2025 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2028 errors_show(mdk_rdev_t
*rdev
, char *page
)
2030 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2034 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2037 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2038 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2039 atomic_set(&rdev
->corrected_errors
, n
);
2044 static struct rdev_sysfs_entry rdev_errors
=
2045 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2048 slot_show(mdk_rdev_t
*rdev
, char *page
)
2050 if (rdev
->raid_disk
< 0)
2051 return sprintf(page
, "none\n");
2053 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2057 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2062 int slot
= simple_strtoul(buf
, &e
, 10);
2063 if (strncmp(buf
, "none", 4)==0)
2065 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2067 if (rdev
->mddev
->pers
&& slot
== -1) {
2068 /* Setting 'slot' on an active array requires also
2069 * updating the 'rd%d' link, and communicating
2070 * with the personality with ->hot_*_disk.
2071 * For now we only support removing
2072 * failed/spare devices. This normally happens automatically,
2073 * but not when the metadata is externally managed.
2075 if (rdev
->raid_disk
== -1)
2077 /* personality does all needed checks */
2078 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2080 err
= rdev
->mddev
->pers
->
2081 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2084 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2085 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2086 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2087 md_wakeup_thread(rdev
->mddev
->thread
);
2088 } else if (rdev
->mddev
->pers
) {
2090 /* Activating a spare .. or possibly reactivating
2091 * if we every get bitmaps working here.
2094 if (rdev
->raid_disk
!= -1)
2097 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2100 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2101 if (rdev2
->raid_disk
== slot
)
2104 rdev
->raid_disk
= slot
;
2105 if (test_bit(In_sync
, &rdev
->flags
))
2106 rdev
->saved_raid_disk
= slot
;
2108 rdev
->saved_raid_disk
= -1;
2109 err
= rdev
->mddev
->pers
->
2110 hot_add_disk(rdev
->mddev
, rdev
);
2112 rdev
->raid_disk
= -1;
2115 sysfs_notify_dirent(rdev
->sysfs_state
);
2116 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2117 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2119 "md: cannot register "
2121 nm
, mdname(rdev
->mddev
));
2123 /* don't wakeup anyone, leave that to userspace. */
2125 if (slot
>= rdev
->mddev
->raid_disks
)
2127 rdev
->raid_disk
= slot
;
2128 /* assume it is working */
2129 clear_bit(Faulty
, &rdev
->flags
);
2130 clear_bit(WriteMostly
, &rdev
->flags
);
2131 set_bit(In_sync
, &rdev
->flags
);
2132 sysfs_notify_dirent(rdev
->sysfs_state
);
2138 static struct rdev_sysfs_entry rdev_slot
=
2139 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2142 offset_show(mdk_rdev_t
*rdev
, char *page
)
2144 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2148 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2151 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2152 if (e
==buf
|| (*e
&& *e
!= '\n'))
2154 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2156 if (rdev
->size
&& rdev
->mddev
->external
)
2157 /* Must set offset before size, so overlap checks
2160 rdev
->data_offset
= offset
;
2164 static struct rdev_sysfs_entry rdev_offset
=
2165 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2168 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2170 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
2173 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2175 /* check if two start/length pairs overlap */
2184 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2186 unsigned long long size
;
2187 unsigned long long oldsize
= rdev
->size
;
2188 mddev_t
*my_mddev
= rdev
->mddev
;
2190 if (strict_strtoull(buf
, 10, &size
) < 0)
2192 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2193 if (my_mddev
->persistent
) {
2194 size
= super_types
[my_mddev
->major_version
].
2195 rdev_size_change(rdev
, size
* 2);
2199 size
= (rdev
->bdev
->bd_inode
->i_size
>> 10);
2200 size
-= rdev
->data_offset
/2;
2203 if (size
< my_mddev
->size
)
2204 return -EINVAL
; /* component must fit device */
2207 if (size
> oldsize
&& my_mddev
->external
) {
2208 /* need to check that all other rdevs with the same ->bdev
2209 * do not overlap. We need to unlock the mddev to avoid
2210 * a deadlock. We have already changed rdev->size, and if
2211 * we have to change it back, we will have the lock again.
2215 struct list_head
*tmp
;
2217 mddev_unlock(my_mddev
);
2218 for_each_mddev(mddev
, tmp
) {
2222 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2223 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2224 (rdev
->bdev
== rdev2
->bdev
&&
2226 overlaps(rdev
->data_offset
, rdev
->size
* 2,
2228 rdev2
->size
* 2))) {
2232 mddev_unlock(mddev
);
2238 mddev_lock(my_mddev
);
2240 /* Someone else could have slipped in a size
2241 * change here, but doing so is just silly.
2242 * We put oldsize back because we *know* it is
2243 * safe, and trust userspace not to race with
2246 rdev
->size
= oldsize
;
2253 static struct rdev_sysfs_entry rdev_size
=
2254 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2256 static struct attribute
*rdev_default_attrs
[] = {
2265 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2267 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2268 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2269 mddev_t
*mddev
= rdev
->mddev
;
2275 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2277 if (rdev
->mddev
== NULL
)
2280 rv
= entry
->show(rdev
, page
);
2281 mddev_unlock(mddev
);
2287 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2288 const char *page
, size_t length
)
2290 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2291 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2293 mddev_t
*mddev
= rdev
->mddev
;
2297 if (!capable(CAP_SYS_ADMIN
))
2299 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2301 if (rdev
->mddev
== NULL
)
2304 rv
= entry
->store(rdev
, page
, length
);
2305 mddev_unlock(mddev
);
2310 static void rdev_free(struct kobject
*ko
)
2312 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2315 static struct sysfs_ops rdev_sysfs_ops
= {
2316 .show
= rdev_attr_show
,
2317 .store
= rdev_attr_store
,
2319 static struct kobj_type rdev_ktype
= {
2320 .release
= rdev_free
,
2321 .sysfs_ops
= &rdev_sysfs_ops
,
2322 .default_attrs
= rdev_default_attrs
,
2326 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2328 * mark the device faulty if:
2330 * - the device is nonexistent (zero size)
2331 * - the device has no valid superblock
2333 * a faulty rdev _never_ has rdev->sb set.
2335 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2337 char b
[BDEVNAME_SIZE
];
2342 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2344 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2345 return ERR_PTR(-ENOMEM
);
2348 if ((err
= alloc_disk_sb(rdev
)))
2351 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2355 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2358 rdev
->saved_raid_disk
= -1;
2359 rdev
->raid_disk
= -1;
2361 rdev
->data_offset
= 0;
2362 rdev
->sb_events
= 0;
2363 atomic_set(&rdev
->nr_pending
, 0);
2364 atomic_set(&rdev
->read_errors
, 0);
2365 atomic_set(&rdev
->corrected_errors
, 0);
2367 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2370 "md: %s has zero or unknown size, marking faulty!\n",
2371 bdevname(rdev
->bdev
,b
));
2376 if (super_format
>= 0) {
2377 err
= super_types
[super_format
].
2378 load_super(rdev
, NULL
, super_minor
);
2379 if (err
== -EINVAL
) {
2381 "md: %s does not have a valid v%d.%d "
2382 "superblock, not importing!\n",
2383 bdevname(rdev
->bdev
,b
),
2384 super_format
, super_minor
);
2389 "md: could not read %s's sb, not importing!\n",
2390 bdevname(rdev
->bdev
,b
));
2395 INIT_LIST_HEAD(&rdev
->same_set
);
2396 init_waitqueue_head(&rdev
->blocked_wait
);
2401 if (rdev
->sb_page
) {
2407 return ERR_PTR(err
);
2411 * Check a full RAID array for plausibility
2415 static void analyze_sbs(mddev_t
* mddev
)
2418 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2419 char b
[BDEVNAME_SIZE
];
2422 rdev_for_each(rdev
, tmp
, mddev
)
2423 switch (super_types
[mddev
->major_version
].
2424 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2432 "md: fatal superblock inconsistency in %s"
2433 " -- removing from array\n",
2434 bdevname(rdev
->bdev
,b
));
2435 kick_rdev_from_array(rdev
);
2439 super_types
[mddev
->major_version
].
2440 validate_super(mddev
, freshest
);
2443 rdev_for_each(rdev
, tmp
, mddev
) {
2444 if (rdev
!= freshest
)
2445 if (super_types
[mddev
->major_version
].
2446 validate_super(mddev
, rdev
)) {
2447 printk(KERN_WARNING
"md: kicking non-fresh %s"
2449 bdevname(rdev
->bdev
,b
));
2450 kick_rdev_from_array(rdev
);
2453 if (mddev
->level
== LEVEL_MULTIPATH
) {
2454 rdev
->desc_nr
= i
++;
2455 rdev
->raid_disk
= rdev
->desc_nr
;
2456 set_bit(In_sync
, &rdev
->flags
);
2457 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2458 rdev
->raid_disk
= -1;
2459 clear_bit(In_sync
, &rdev
->flags
);
2465 if (mddev
->recovery_cp
!= MaxSector
&&
2467 printk(KERN_ERR
"md: %s: raid array is not clean"
2468 " -- starting background reconstruction\n",
2473 static void md_safemode_timeout(unsigned long data
);
2476 safe_delay_show(mddev_t
*mddev
, char *page
)
2478 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2479 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2482 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2490 /* remove a period, and count digits after it */
2491 if (len
>= sizeof(buf
))
2493 strlcpy(buf
, cbuf
, sizeof(buf
));
2494 for (i
=0; i
<len
; i
++) {
2496 if (isdigit(buf
[i
])) {
2501 } else if (buf
[i
] == '.') {
2506 if (strict_strtoul(buf
, 10, &msec
) < 0)
2508 msec
= (msec
* 1000) / scale
;
2510 mddev
->safemode_delay
= 0;
2512 unsigned long old_delay
= mddev
->safemode_delay
;
2513 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2514 if (mddev
->safemode_delay
== 0)
2515 mddev
->safemode_delay
= 1;
2516 if (mddev
->safemode_delay
< old_delay
)
2517 md_safemode_timeout((unsigned long)mddev
);
2521 static struct md_sysfs_entry md_safe_delay
=
2522 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2525 level_show(mddev_t
*mddev
, char *page
)
2527 struct mdk_personality
*p
= mddev
->pers
;
2529 return sprintf(page
, "%s\n", p
->name
);
2530 else if (mddev
->clevel
[0])
2531 return sprintf(page
, "%s\n", mddev
->clevel
);
2532 else if (mddev
->level
!= LEVEL_NONE
)
2533 return sprintf(page
, "%d\n", mddev
->level
);
2539 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2546 if (len
>= sizeof(mddev
->clevel
))
2548 strncpy(mddev
->clevel
, buf
, len
);
2549 if (mddev
->clevel
[len
-1] == '\n')
2551 mddev
->clevel
[len
] = 0;
2552 mddev
->level
= LEVEL_NONE
;
2556 static struct md_sysfs_entry md_level
=
2557 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2561 layout_show(mddev_t
*mddev
, char *page
)
2563 /* just a number, not meaningful for all levels */
2564 if (mddev
->reshape_position
!= MaxSector
&&
2565 mddev
->layout
!= mddev
->new_layout
)
2566 return sprintf(page
, "%d (%d)\n",
2567 mddev
->new_layout
, mddev
->layout
);
2568 return sprintf(page
, "%d\n", mddev
->layout
);
2572 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2575 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2577 if (!*buf
|| (*e
&& *e
!= '\n'))
2582 if (mddev
->reshape_position
!= MaxSector
)
2583 mddev
->new_layout
= n
;
2588 static struct md_sysfs_entry md_layout
=
2589 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2593 raid_disks_show(mddev_t
*mddev
, char *page
)
2595 if (mddev
->raid_disks
== 0)
2597 if (mddev
->reshape_position
!= MaxSector
&&
2598 mddev
->delta_disks
!= 0)
2599 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2600 mddev
->raid_disks
- mddev
->delta_disks
);
2601 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2604 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2607 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2611 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2613 if (!*buf
|| (*e
&& *e
!= '\n'))
2617 rv
= update_raid_disks(mddev
, n
);
2618 else if (mddev
->reshape_position
!= MaxSector
) {
2619 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2620 mddev
->delta_disks
= n
- olddisks
;
2621 mddev
->raid_disks
= n
;
2623 mddev
->raid_disks
= n
;
2624 return rv
? rv
: len
;
2626 static struct md_sysfs_entry md_raid_disks
=
2627 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2630 chunk_size_show(mddev_t
*mddev
, char *page
)
2632 if (mddev
->reshape_position
!= MaxSector
&&
2633 mddev
->chunk_size
!= mddev
->new_chunk
)
2634 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2636 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2640 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2642 /* can only set chunk_size if array is not yet active */
2644 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2646 if (!*buf
|| (*e
&& *e
!= '\n'))
2651 else if (mddev
->reshape_position
!= MaxSector
)
2652 mddev
->new_chunk
= n
;
2654 mddev
->chunk_size
= n
;
2657 static struct md_sysfs_entry md_chunk_size
=
2658 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2661 resync_start_show(mddev_t
*mddev
, char *page
)
2663 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2667 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2670 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2674 if (!*buf
|| (*e
&& *e
!= '\n'))
2677 mddev
->recovery_cp
= n
;
2680 static struct md_sysfs_entry md_resync_start
=
2681 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2684 * The array state can be:
2687 * No devices, no size, no level
2688 * Equivalent to STOP_ARRAY ioctl
2690 * May have some settings, but array is not active
2691 * all IO results in error
2692 * When written, doesn't tear down array, but just stops it
2693 * suspended (not supported yet)
2694 * All IO requests will block. The array can be reconfigured.
2695 * Writing this, if accepted, will block until array is quiescent
2697 * no resync can happen. no superblocks get written.
2698 * write requests fail
2700 * like readonly, but behaves like 'clean' on a write request.
2702 * clean - no pending writes, but otherwise active.
2703 * When written to inactive array, starts without resync
2704 * If a write request arrives then
2705 * if metadata is known, mark 'dirty' and switch to 'active'.
2706 * if not known, block and switch to write-pending
2707 * If written to an active array that has pending writes, then fails.
2709 * fully active: IO and resync can be happening.
2710 * When written to inactive array, starts with resync
2713 * clean, but writes are blocked waiting for 'active' to be written.
2716 * like active, but no writes have been seen for a while (100msec).
2719 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2720 write_pending
, active_idle
, bad_word
};
2721 static char *array_states
[] = {
2722 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2723 "write-pending", "active-idle", NULL
};
2725 static int match_word(const char *word
, char **list
)
2728 for (n
=0; list
[n
]; n
++)
2729 if (cmd_match(word
, list
[n
]))
2735 array_state_show(mddev_t
*mddev
, char *page
)
2737 enum array_state st
= inactive
;
2750 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2752 else if (mddev
->safemode
)
2758 if (list_empty(&mddev
->disks
) &&
2759 mddev
->raid_disks
== 0 &&
2765 return sprintf(page
, "%s\n", array_states
[st
]);
2768 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2769 static int do_md_run(mddev_t
* mddev
);
2770 static int restart_array(mddev_t
*mddev
);
2773 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2776 enum array_state st
= match_word(buf
, array_states
);
2781 /* stopping an active array */
2782 if (atomic_read(&mddev
->openers
) > 0)
2784 err
= do_md_stop(mddev
, 0, 0);
2787 /* stopping an active array */
2789 if (atomic_read(&mddev
->openers
) > 0)
2791 err
= do_md_stop(mddev
, 2, 0);
2793 err
= 0; /* already inactive */
2796 break; /* not supported yet */
2799 err
= do_md_stop(mddev
, 1, 0);
2802 set_disk_ro(mddev
->gendisk
, 1);
2803 err
= do_md_run(mddev
);
2809 err
= do_md_stop(mddev
, 1, 0);
2810 else if (mddev
->ro
== 1)
2811 err
= restart_array(mddev
);
2814 set_disk_ro(mddev
->gendisk
, 0);
2818 err
= do_md_run(mddev
);
2823 restart_array(mddev
);
2824 spin_lock_irq(&mddev
->write_lock
);
2825 if (atomic_read(&mddev
->writes_pending
) == 0) {
2826 if (mddev
->in_sync
== 0) {
2828 if (mddev
->safemode
== 1)
2829 mddev
->safemode
= 0;
2830 if (mddev
->persistent
)
2831 set_bit(MD_CHANGE_CLEAN
,
2837 spin_unlock_irq(&mddev
->write_lock
);
2840 mddev
->recovery_cp
= MaxSector
;
2841 err
= do_md_run(mddev
);
2846 restart_array(mddev
);
2847 if (mddev
->external
)
2848 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2849 wake_up(&mddev
->sb_wait
);
2853 set_disk_ro(mddev
->gendisk
, 0);
2854 err
= do_md_run(mddev
);
2859 /* these cannot be set */
2865 sysfs_notify_dirent(mddev
->sysfs_state
);
2869 static struct md_sysfs_entry md_array_state
=
2870 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2873 null_show(mddev_t
*mddev
, char *page
)
2879 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2881 /* buf must be %d:%d\n? giving major and minor numbers */
2882 /* The new device is added to the array.
2883 * If the array has a persistent superblock, we read the
2884 * superblock to initialise info and check validity.
2885 * Otherwise, only checking done is that in bind_rdev_to_array,
2886 * which mainly checks size.
2889 int major
= simple_strtoul(buf
, &e
, 10);
2895 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2897 minor
= simple_strtoul(e
+1, &e
, 10);
2898 if (*e
&& *e
!= '\n')
2900 dev
= MKDEV(major
, minor
);
2901 if (major
!= MAJOR(dev
) ||
2902 minor
!= MINOR(dev
))
2906 if (mddev
->persistent
) {
2907 rdev
= md_import_device(dev
, mddev
->major_version
,
2908 mddev
->minor_version
);
2909 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2910 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2911 mdk_rdev_t
, same_set
);
2912 err
= super_types
[mddev
->major_version
]
2913 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2917 } else if (mddev
->external
)
2918 rdev
= md_import_device(dev
, -2, -1);
2920 rdev
= md_import_device(dev
, -1, -1);
2923 return PTR_ERR(rdev
);
2924 err
= bind_rdev_to_array(rdev
, mddev
);
2928 return err
? err
: len
;
2931 static struct md_sysfs_entry md_new_device
=
2932 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2935 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2938 unsigned long chunk
, end_chunk
;
2942 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2944 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2945 if (buf
== end
) break;
2946 if (*end
== '-') { /* range */
2948 end_chunk
= simple_strtoul(buf
, &end
, 0);
2949 if (buf
== end
) break;
2951 if (*end
&& !isspace(*end
)) break;
2952 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2954 while (isspace(*buf
)) buf
++;
2956 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2961 static struct md_sysfs_entry md_bitmap
=
2962 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2965 size_show(mddev_t
*mddev
, char *page
)
2967 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2970 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
2973 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2975 /* If array is inactive, we can reduce the component size, but
2976 * not increase it (except from 0).
2977 * If array is active, we can try an on-line resize
2981 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2982 if (!*buf
|| *buf
== '\n' ||
2987 err
= update_size(mddev
, size
* 2);
2988 md_update_sb(mddev
, 1);
2990 if (mddev
->size
== 0 ||
2996 return err
? err
: len
;
2999 static struct md_sysfs_entry md_size
=
3000 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3005 * 'none' for arrays with no metadata (good luck...)
3006 * 'external' for arrays with externally managed metadata,
3007 * or N.M for internally known formats
3010 metadata_show(mddev_t
*mddev
, char *page
)
3012 if (mddev
->persistent
)
3013 return sprintf(page
, "%d.%d\n",
3014 mddev
->major_version
, mddev
->minor_version
);
3015 else if (mddev
->external
)
3016 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3018 return sprintf(page
, "none\n");
3022 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3026 /* Changing the details of 'external' metadata is
3027 * always permitted. Otherwise there must be
3028 * no devices attached to the array.
3030 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3032 else if (!list_empty(&mddev
->disks
))
3035 if (cmd_match(buf
, "none")) {
3036 mddev
->persistent
= 0;
3037 mddev
->external
= 0;
3038 mddev
->major_version
= 0;
3039 mddev
->minor_version
= 90;
3042 if (strncmp(buf
, "external:", 9) == 0) {
3043 size_t namelen
= len
-9;
3044 if (namelen
>= sizeof(mddev
->metadata_type
))
3045 namelen
= sizeof(mddev
->metadata_type
)-1;
3046 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3047 mddev
->metadata_type
[namelen
] = 0;
3048 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3049 mddev
->metadata_type
[--namelen
] = 0;
3050 mddev
->persistent
= 0;
3051 mddev
->external
= 1;
3052 mddev
->major_version
= 0;
3053 mddev
->minor_version
= 90;
3056 major
= simple_strtoul(buf
, &e
, 10);
3057 if (e
==buf
|| *e
!= '.')
3060 minor
= simple_strtoul(buf
, &e
, 10);
3061 if (e
==buf
|| (*e
&& *e
!= '\n') )
3063 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3065 mddev
->major_version
= major
;
3066 mddev
->minor_version
= minor
;
3067 mddev
->persistent
= 1;
3068 mddev
->external
= 0;
3072 static struct md_sysfs_entry md_metadata
=
3073 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3076 action_show(mddev_t
*mddev
, char *page
)
3078 char *type
= "idle";
3079 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3080 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3081 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3083 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3084 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3086 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3090 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3093 return sprintf(page
, "%s\n", type
);
3097 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3099 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3102 if (cmd_match(page
, "idle")) {
3103 if (mddev
->sync_thread
) {
3104 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3105 md_unregister_thread(mddev
->sync_thread
);
3106 mddev
->sync_thread
= NULL
;
3107 mddev
->recovery
= 0;
3109 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3110 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3112 else if (cmd_match(page
, "resync"))
3113 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3114 else if (cmd_match(page
, "recover")) {
3115 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3116 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3117 } else if (cmd_match(page
, "reshape")) {
3119 if (mddev
->pers
->start_reshape
== NULL
)
3121 err
= mddev
->pers
->start_reshape(mddev
);
3124 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3126 if (cmd_match(page
, "check"))
3127 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3128 else if (!cmd_match(page
, "repair"))
3130 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3131 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3133 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3134 md_wakeup_thread(mddev
->thread
);
3135 sysfs_notify_dirent(mddev
->sysfs_action
);
3140 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3142 return sprintf(page
, "%llu\n",
3143 (unsigned long long) mddev
->resync_mismatches
);
3146 static struct md_sysfs_entry md_scan_mode
=
3147 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3150 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3153 sync_min_show(mddev_t
*mddev
, char *page
)
3155 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3156 mddev
->sync_speed_min
? "local": "system");
3160 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3164 if (strncmp(buf
, "system", 6)==0) {
3165 mddev
->sync_speed_min
= 0;
3168 min
= simple_strtoul(buf
, &e
, 10);
3169 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3171 mddev
->sync_speed_min
= min
;
3175 static struct md_sysfs_entry md_sync_min
=
3176 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3179 sync_max_show(mddev_t
*mddev
, char *page
)
3181 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3182 mddev
->sync_speed_max
? "local": "system");
3186 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3190 if (strncmp(buf
, "system", 6)==0) {
3191 mddev
->sync_speed_max
= 0;
3194 max
= simple_strtoul(buf
, &e
, 10);
3195 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3197 mddev
->sync_speed_max
= max
;
3201 static struct md_sysfs_entry md_sync_max
=
3202 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3205 degraded_show(mddev_t
*mddev
, char *page
)
3207 return sprintf(page
, "%d\n", mddev
->degraded
);
3209 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3212 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3214 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3218 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3222 if (strict_strtol(buf
, 10, &n
))
3225 if (n
!= 0 && n
!= 1)
3228 mddev
->parallel_resync
= n
;
3230 if (mddev
->sync_thread
)
3231 wake_up(&resync_wait
);
3236 /* force parallel resync, even with shared block devices */
3237 static struct md_sysfs_entry md_sync_force_parallel
=
3238 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3239 sync_force_parallel_show
, sync_force_parallel_store
);
3242 sync_speed_show(mddev_t
*mddev
, char *page
)
3244 unsigned long resync
, dt
, db
;
3245 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3246 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3248 db
= resync
- mddev
->resync_mark_cnt
;
3249 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3252 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3255 sync_completed_show(mddev_t
*mddev
, char *page
)
3257 unsigned long max_blocks
, resync
;
3259 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3260 max_blocks
= mddev
->resync_max_sectors
;
3262 max_blocks
= mddev
->size
<< 1;
3264 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3265 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3268 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3271 min_sync_show(mddev_t
*mddev
, char *page
)
3273 return sprintf(page
, "%llu\n",
3274 (unsigned long long)mddev
->resync_min
);
3277 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3279 unsigned long long min
;
3280 if (strict_strtoull(buf
, 10, &min
))
3282 if (min
> mddev
->resync_max
)
3284 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3287 /* Must be a multiple of chunk_size */
3288 if (mddev
->chunk_size
) {
3289 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3292 mddev
->resync_min
= min
;
3297 static struct md_sysfs_entry md_min_sync
=
3298 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3301 max_sync_show(mddev_t
*mddev
, char *page
)
3303 if (mddev
->resync_max
== MaxSector
)
3304 return sprintf(page
, "max\n");
3306 return sprintf(page
, "%llu\n",
3307 (unsigned long long)mddev
->resync_max
);
3310 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3312 if (strncmp(buf
, "max", 3) == 0)
3313 mddev
->resync_max
= MaxSector
;
3315 unsigned long long max
;
3316 if (strict_strtoull(buf
, 10, &max
))
3318 if (max
< mddev
->resync_min
)
3320 if (max
< mddev
->resync_max
&&
3321 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3324 /* Must be a multiple of chunk_size */
3325 if (mddev
->chunk_size
) {
3326 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3329 mddev
->resync_max
= max
;
3331 wake_up(&mddev
->recovery_wait
);
3335 static struct md_sysfs_entry md_max_sync
=
3336 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3339 suspend_lo_show(mddev_t
*mddev
, char *page
)
3341 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3345 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3348 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3350 if (mddev
->pers
->quiesce
== NULL
)
3352 if (buf
== e
|| (*e
&& *e
!= '\n'))
3354 if (new >= mddev
->suspend_hi
||
3355 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3356 mddev
->suspend_lo
= new;
3357 mddev
->pers
->quiesce(mddev
, 2);
3362 static struct md_sysfs_entry md_suspend_lo
=
3363 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3367 suspend_hi_show(mddev_t
*mddev
, char *page
)
3369 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3373 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3376 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3378 if (mddev
->pers
->quiesce
== NULL
)
3380 if (buf
== e
|| (*e
&& *e
!= '\n'))
3382 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3383 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3384 mddev
->suspend_hi
= new;
3385 mddev
->pers
->quiesce(mddev
, 1);
3386 mddev
->pers
->quiesce(mddev
, 0);
3391 static struct md_sysfs_entry md_suspend_hi
=
3392 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3395 reshape_position_show(mddev_t
*mddev
, char *page
)
3397 if (mddev
->reshape_position
!= MaxSector
)
3398 return sprintf(page
, "%llu\n",
3399 (unsigned long long)mddev
->reshape_position
);
3400 strcpy(page
, "none\n");
3405 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3408 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3411 if (buf
== e
|| (*e
&& *e
!= '\n'))
3413 mddev
->reshape_position
= new;
3414 mddev
->delta_disks
= 0;
3415 mddev
->new_level
= mddev
->level
;
3416 mddev
->new_layout
= mddev
->layout
;
3417 mddev
->new_chunk
= mddev
->chunk_size
;
3421 static struct md_sysfs_entry md_reshape_position
=
3422 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3423 reshape_position_store
);
3426 static struct attribute
*md_default_attrs
[] = {
3429 &md_raid_disks
.attr
,
3430 &md_chunk_size
.attr
,
3432 &md_resync_start
.attr
,
3434 &md_new_device
.attr
,
3435 &md_safe_delay
.attr
,
3436 &md_array_state
.attr
,
3437 &md_reshape_position
.attr
,
3441 static struct attribute
*md_redundancy_attrs
[] = {
3443 &md_mismatches
.attr
,
3446 &md_sync_speed
.attr
,
3447 &md_sync_force_parallel
.attr
,
3448 &md_sync_completed
.attr
,
3451 &md_suspend_lo
.attr
,
3452 &md_suspend_hi
.attr
,
3457 static struct attribute_group md_redundancy_group
= {
3459 .attrs
= md_redundancy_attrs
,
3464 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3466 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3467 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3472 rv
= mddev_lock(mddev
);
3474 rv
= entry
->show(mddev
, page
);
3475 mddev_unlock(mddev
);
3481 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3482 const char *page
, size_t length
)
3484 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3485 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3490 if (!capable(CAP_SYS_ADMIN
))
3492 rv
= mddev_lock(mddev
);
3493 if (mddev
->hold_active
== UNTIL_IOCTL
)
3494 mddev
->hold_active
= 0;
3496 rv
= entry
->store(mddev
, page
, length
);
3497 mddev_unlock(mddev
);
3502 static void md_free(struct kobject
*ko
)
3504 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3506 if (mddev
->sysfs_state
)
3507 sysfs_put(mddev
->sysfs_state
);
3509 if (mddev
->gendisk
) {
3510 del_gendisk(mddev
->gendisk
);
3511 put_disk(mddev
->gendisk
);
3514 blk_cleanup_queue(mddev
->queue
);
3519 static struct sysfs_ops md_sysfs_ops
= {
3520 .show
= md_attr_show
,
3521 .store
= md_attr_store
,
3523 static struct kobj_type md_ktype
= {
3525 .sysfs_ops
= &md_sysfs_ops
,
3526 .default_attrs
= md_default_attrs
,
3531 static int md_alloc(dev_t dev
, char *name
)
3533 static DEFINE_MUTEX(disks_mutex
);
3534 mddev_t
*mddev
= mddev_find(dev
);
3535 struct gendisk
*disk
;
3544 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
3545 shift
= partitioned
? MdpMinorShift
: 0;
3546 unit
= MINOR(mddev
->unit
) >> shift
;
3548 /* wait for any previous instance if this device
3549 * to be completed removed (mddev_delayed_delete).
3551 flush_scheduled_work();
3553 mutex_lock(&disks_mutex
);
3554 if (mddev
->gendisk
) {
3555 mutex_unlock(&disks_mutex
);
3561 /* Need to ensure that 'name' is not a duplicate.
3564 spin_lock(&all_mddevs_lock
);
3566 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
3567 if (mddev2
->gendisk
&&
3568 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
3569 spin_unlock(&all_mddevs_lock
);
3572 spin_unlock(&all_mddevs_lock
);
3575 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
3576 if (!mddev
->queue
) {
3577 mutex_unlock(&disks_mutex
);
3581 /* Can be unlocked because the queue is new: no concurrency */
3582 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
3584 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3586 disk
= alloc_disk(1 << shift
);
3588 mutex_unlock(&disks_mutex
);
3589 blk_cleanup_queue(mddev
->queue
);
3590 mddev
->queue
= NULL
;
3594 disk
->major
= MAJOR(mddev
->unit
);
3595 disk
->first_minor
= unit
<< shift
;
3597 strcpy(disk
->disk_name
, name
);
3598 else if (partitioned
)
3599 sprintf(disk
->disk_name
, "md_d%d", unit
);
3601 sprintf(disk
->disk_name
, "md%d", unit
);
3602 disk
->fops
= &md_fops
;
3603 disk
->private_data
= mddev
;
3604 disk
->queue
= mddev
->queue
;
3605 /* Allow extended partitions. This makes the
3606 * 'mdp' device redundant, but we can't really
3609 disk
->flags
|= GENHD_FL_EXT_DEVT
;
3611 mddev
->gendisk
= disk
;
3612 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3613 &disk_to_dev(disk
)->kobj
, "%s", "md");
3614 mutex_unlock(&disks_mutex
);
3616 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3619 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3620 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
3626 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3628 md_alloc(dev
, NULL
);
3632 static int add_named_array(const char *val
, struct kernel_param
*kp
)
3634 /* val must be "md_*" where * is not all digits.
3635 * We allocate an array with a large free minor number, and
3636 * set the name to val. val must not already be an active name.
3638 int len
= strlen(val
);
3639 char buf
[DISK_NAME_LEN
];
3641 while (len
&& val
[len
-1] == '\n')
3643 if (len
>= DISK_NAME_LEN
)
3645 strlcpy(buf
, val
, len
+1);
3646 if (strncmp(buf
, "md_", 3) != 0)
3648 return md_alloc(0, buf
);
3651 static void md_safemode_timeout(unsigned long data
)
3653 mddev_t
*mddev
= (mddev_t
*) data
;
3655 if (!atomic_read(&mddev
->writes_pending
)) {
3656 mddev
->safemode
= 1;
3657 if (mddev
->external
)
3658 sysfs_notify_dirent(mddev
->sysfs_state
);
3660 md_wakeup_thread(mddev
->thread
);
3663 static int start_dirty_degraded
;
3665 static int do_md_run(mddev_t
* mddev
)
3670 struct gendisk
*disk
;
3671 struct mdk_personality
*pers
;
3672 char b
[BDEVNAME_SIZE
];
3674 if (list_empty(&mddev
->disks
))
3675 /* cannot run an array with no devices.. */
3682 * Analyze all RAID superblock(s)
3684 if (!mddev
->raid_disks
) {
3685 if (!mddev
->persistent
)
3690 chunk_size
= mddev
->chunk_size
;
3693 if (chunk_size
> MAX_CHUNK_SIZE
) {
3694 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3695 chunk_size
, MAX_CHUNK_SIZE
);
3699 * chunk-size has to be a power of 2
3701 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3702 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3706 /* devices must have minimum size of one chunk */
3707 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3708 if (test_bit(Faulty
, &rdev
->flags
))
3710 if (rdev
->size
< chunk_size
/ 1024) {
3712 "md: Dev %s smaller than chunk_size:"
3714 bdevname(rdev
->bdev
,b
),
3715 (unsigned long long)rdev
->size
,
3722 if (mddev
->level
!= LEVEL_NONE
)
3723 request_module("md-level-%d", mddev
->level
);
3724 else if (mddev
->clevel
[0])
3725 request_module("md-%s", mddev
->clevel
);
3728 * Drop all container device buffers, from now on
3729 * the only valid external interface is through the md
3732 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3733 if (test_bit(Faulty
, &rdev
->flags
))
3735 sync_blockdev(rdev
->bdev
);
3736 invalidate_bdev(rdev
->bdev
);
3738 /* perform some consistency tests on the device.
3739 * We don't want the data to overlap the metadata,
3740 * Internal Bitmap issues has handled elsewhere.
3742 if (rdev
->data_offset
< rdev
->sb_start
) {
3744 rdev
->data_offset
+ mddev
->size
*2
3746 printk("md: %s: data overlaps metadata\n",
3751 if (rdev
->sb_start
+ rdev
->sb_size
/512
3752 > rdev
->data_offset
) {
3753 printk("md: %s: metadata overlaps data\n",
3758 sysfs_notify_dirent(rdev
->sysfs_state
);
3761 md_probe(mddev
->unit
, NULL
, NULL
);
3762 disk
= mddev
->gendisk
;
3766 spin_lock(&pers_lock
);
3767 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3768 if (!pers
|| !try_module_get(pers
->owner
)) {
3769 spin_unlock(&pers_lock
);
3770 if (mddev
->level
!= LEVEL_NONE
)
3771 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3774 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3779 spin_unlock(&pers_lock
);
3780 mddev
->level
= pers
->level
;
3781 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3783 if (mddev
->reshape_position
!= MaxSector
&&
3784 pers
->start_reshape
== NULL
) {
3785 /* This personality cannot handle reshaping... */
3787 module_put(pers
->owner
);
3791 if (pers
->sync_request
) {
3792 /* Warn if this is a potentially silly
3795 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3799 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3800 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
3802 rdev
->bdev
->bd_contains
==
3803 rdev2
->bdev
->bd_contains
) {
3805 "%s: WARNING: %s appears to be"
3806 " on the same physical disk as"
3809 bdevname(rdev
->bdev
,b
),
3810 bdevname(rdev2
->bdev
,b2
));
3817 "True protection against single-disk"
3818 " failure might be compromised.\n");
3821 mddev
->recovery
= 0;
3822 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3823 mddev
->barriers_work
= 1;
3824 mddev
->ok_start_degraded
= start_dirty_degraded
;
3827 mddev
->ro
= 2; /* read-only, but switch on first write */
3829 err
= mddev
->pers
->run(mddev
);
3831 printk(KERN_ERR
"md: pers->run() failed ...\n");
3832 else if (mddev
->pers
->sync_request
) {
3833 err
= bitmap_create(mddev
);
3835 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3836 mdname(mddev
), err
);
3837 mddev
->pers
->stop(mddev
);
3841 module_put(mddev
->pers
->owner
);
3843 bitmap_destroy(mddev
);
3846 if (mddev
->pers
->sync_request
) {
3847 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3849 "md: cannot register extra attributes for %s\n",
3851 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3852 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3855 atomic_set(&mddev
->writes_pending
,0);
3856 mddev
->safemode
= 0;
3857 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3858 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3859 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3862 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3863 if (rdev
->raid_disk
>= 0) {
3865 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3866 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3867 printk("md: cannot register %s for %s\n",
3871 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3874 md_update_sb(mddev
, 0);
3876 set_capacity(disk
, mddev
->array_sectors
);
3878 /* If we call blk_queue_make_request here, it will
3879 * re-initialise max_sectors etc which may have been
3880 * refined inside -> run. So just set the bits we need to set.
3881 * Most initialisation happended when we called
3882 * blk_queue_make_request(..., md_fail_request)
3885 mddev
->queue
->queuedata
= mddev
;
3886 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3888 /* If there is a partially-recovered drive we need to
3889 * start recovery here. If we leave it to md_check_recovery,
3890 * it will remove the drives and not do the right thing
3892 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3894 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3895 if (rdev
->raid_disk
>= 0 &&
3896 !test_bit(In_sync
, &rdev
->flags
) &&
3897 !test_bit(Faulty
, &rdev
->flags
))
3898 /* complete an interrupted recovery */
3900 if (spares
&& mddev
->pers
->sync_request
) {
3901 mddev
->recovery
= 0;
3902 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3903 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3906 if (!mddev
->sync_thread
) {
3907 printk(KERN_ERR
"%s: could not start resync"
3910 /* leave the spares where they are, it shouldn't hurt */
3911 mddev
->recovery
= 0;
3915 md_wakeup_thread(mddev
->thread
);
3916 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3919 md_new_event(mddev
);
3920 sysfs_notify_dirent(mddev
->sysfs_state
);
3921 if (mddev
->sysfs_action
)
3922 sysfs_notify_dirent(mddev
->sysfs_action
);
3923 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3924 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
3928 static int restart_array(mddev_t
*mddev
)
3930 struct gendisk
*disk
= mddev
->gendisk
;
3932 /* Complain if it has no devices */
3933 if (list_empty(&mddev
->disks
))
3939 mddev
->safemode
= 0;
3941 set_disk_ro(disk
, 0);
3942 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3944 /* Kick recovery or resync if necessary */
3945 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3946 md_wakeup_thread(mddev
->thread
);
3947 md_wakeup_thread(mddev
->sync_thread
);
3948 sysfs_notify_dirent(mddev
->sysfs_state
);
3952 /* similar to deny_write_access, but accounts for our holding a reference
3953 * to the file ourselves */
3954 static int deny_bitmap_write_access(struct file
* file
)
3956 struct inode
*inode
= file
->f_mapping
->host
;
3958 spin_lock(&inode
->i_lock
);
3959 if (atomic_read(&inode
->i_writecount
) > 1) {
3960 spin_unlock(&inode
->i_lock
);
3963 atomic_set(&inode
->i_writecount
, -1);
3964 spin_unlock(&inode
->i_lock
);
3969 static void restore_bitmap_write_access(struct file
*file
)
3971 struct inode
*inode
= file
->f_mapping
->host
;
3973 spin_lock(&inode
->i_lock
);
3974 atomic_set(&inode
->i_writecount
, 1);
3975 spin_unlock(&inode
->i_lock
);
3979 * 0 - completely stop and dis-assemble array
3980 * 1 - switch to readonly
3981 * 2 - stop but do not disassemble array
3983 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
3986 struct gendisk
*disk
= mddev
->gendisk
;
3988 if (atomic_read(&mddev
->openers
) > is_open
) {
3989 printk("md: %s still in use.\n",mdname(mddev
));
3995 if (mddev
->sync_thread
) {
3996 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3997 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3998 md_unregister_thread(mddev
->sync_thread
);
3999 mddev
->sync_thread
= NULL
;
4002 del_timer_sync(&mddev
->safemode_timer
);
4005 case 1: /* readonly */
4011 case 0: /* disassemble */
4013 bitmap_flush(mddev
);
4014 md_super_wait(mddev
);
4016 set_disk_ro(disk
, 0);
4017 blk_queue_make_request(mddev
->queue
, md_fail_request
);
4018 mddev
->pers
->stop(mddev
);
4019 mddev
->queue
->merge_bvec_fn
= NULL
;
4020 mddev
->queue
->unplug_fn
= NULL
;
4021 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4022 if (mddev
->pers
->sync_request
) {
4023 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
4024 if (mddev
->sysfs_action
)
4025 sysfs_put(mddev
->sysfs_action
);
4026 mddev
->sysfs_action
= NULL
;
4028 module_put(mddev
->pers
->owner
);
4030 /* tell userspace to handle 'inactive' */
4031 sysfs_notify_dirent(mddev
->sysfs_state
);
4033 set_capacity(disk
, 0);
4039 if (!mddev
->in_sync
|| mddev
->flags
) {
4040 /* mark array as shutdown cleanly */
4042 md_update_sb(mddev
, 1);
4045 set_disk_ro(disk
, 1);
4046 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4050 * Free resources if final stop
4055 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4057 bitmap_destroy(mddev
);
4058 if (mddev
->bitmap_file
) {
4059 restore_bitmap_write_access(mddev
->bitmap_file
);
4060 fput(mddev
->bitmap_file
);
4061 mddev
->bitmap_file
= NULL
;
4063 mddev
->bitmap_offset
= 0;
4065 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4066 if (rdev
->raid_disk
>= 0) {
4068 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4069 sysfs_remove_link(&mddev
->kobj
, nm
);
4072 /* make sure all md_delayed_delete calls have finished */
4073 flush_scheduled_work();
4075 export_array(mddev
);
4077 mddev
->array_sectors
= 0;
4079 mddev
->raid_disks
= 0;
4080 mddev
->recovery_cp
= 0;
4081 mddev
->resync_min
= 0;
4082 mddev
->resync_max
= MaxSector
;
4083 mddev
->reshape_position
= MaxSector
;
4084 mddev
->external
= 0;
4085 mddev
->persistent
= 0;
4086 mddev
->level
= LEVEL_NONE
;
4087 mddev
->clevel
[0] = 0;
4090 mddev
->metadata_type
[0] = 0;
4091 mddev
->chunk_size
= 0;
4092 mddev
->ctime
= mddev
->utime
= 0;
4094 mddev
->max_disks
= 0;
4096 mddev
->delta_disks
= 0;
4097 mddev
->new_level
= LEVEL_NONE
;
4098 mddev
->new_layout
= 0;
4099 mddev
->new_chunk
= 0;
4100 mddev
->curr_resync
= 0;
4101 mddev
->resync_mismatches
= 0;
4102 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4103 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4104 mddev
->recovery
= 0;
4107 mddev
->degraded
= 0;
4108 mddev
->barriers_work
= 0;
4109 mddev
->safemode
= 0;
4110 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4111 if (mddev
->hold_active
== UNTIL_STOP
)
4112 mddev
->hold_active
= 0;
4114 } else if (mddev
->pers
)
4115 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
4118 md_new_event(mddev
);
4119 sysfs_notify_dirent(mddev
->sysfs_state
);
4125 static void autorun_array(mddev_t
*mddev
)
4130 if (list_empty(&mddev
->disks
))
4133 printk(KERN_INFO
"md: running: ");
4135 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4136 char b
[BDEVNAME_SIZE
];
4137 printk("<%s>", bdevname(rdev
->bdev
,b
));
4141 err
= do_md_run(mddev
);
4143 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4144 do_md_stop(mddev
, 0, 0);
4149 * lets try to run arrays based on all disks that have arrived
4150 * until now. (those are in pending_raid_disks)
4152 * the method: pick the first pending disk, collect all disks with
4153 * the same UUID, remove all from the pending list and put them into
4154 * the 'same_array' list. Then order this list based on superblock
4155 * update time (freshest comes first), kick out 'old' disks and
4156 * compare superblocks. If everything's fine then run it.
4158 * If "unit" is allocated, then bump its reference count
4160 static void autorun_devices(int part
)
4162 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4164 char b
[BDEVNAME_SIZE
];
4166 printk(KERN_INFO
"md: autorun ...\n");
4167 while (!list_empty(&pending_raid_disks
)) {
4170 LIST_HEAD(candidates
);
4171 rdev0
= list_entry(pending_raid_disks
.next
,
4172 mdk_rdev_t
, same_set
);
4174 printk(KERN_INFO
"md: considering %s ...\n",
4175 bdevname(rdev0
->bdev
,b
));
4176 INIT_LIST_HEAD(&candidates
);
4177 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4178 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4179 printk(KERN_INFO
"md: adding %s ...\n",
4180 bdevname(rdev
->bdev
,b
));
4181 list_move(&rdev
->same_set
, &candidates
);
4184 * now we have a set of devices, with all of them having
4185 * mostly sane superblocks. It's time to allocate the
4189 dev
= MKDEV(mdp_major
,
4190 rdev0
->preferred_minor
<< MdpMinorShift
);
4191 unit
= MINOR(dev
) >> MdpMinorShift
;
4193 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4196 if (rdev0
->preferred_minor
!= unit
) {
4197 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4198 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4202 md_probe(dev
, NULL
, NULL
);
4203 mddev
= mddev_find(dev
);
4204 if (!mddev
|| !mddev
->gendisk
) {
4208 "md: cannot allocate memory for md drive.\n");
4211 if (mddev_lock(mddev
))
4212 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4214 else if (mddev
->raid_disks
|| mddev
->major_version
4215 || !list_empty(&mddev
->disks
)) {
4217 "md: %s already running, cannot run %s\n",
4218 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4219 mddev_unlock(mddev
);
4221 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4222 mddev
->persistent
= 1;
4223 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4224 list_del_init(&rdev
->same_set
);
4225 if (bind_rdev_to_array(rdev
, mddev
))
4228 autorun_array(mddev
);
4229 mddev_unlock(mddev
);
4231 /* on success, candidates will be empty, on error
4234 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4235 list_del_init(&rdev
->same_set
);
4240 printk(KERN_INFO
"md: ... autorun DONE.\n");
4242 #endif /* !MODULE */
4244 static int get_version(void __user
* arg
)
4248 ver
.major
= MD_MAJOR_VERSION
;
4249 ver
.minor
= MD_MINOR_VERSION
;
4250 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4252 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4258 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4260 mdu_array_info_t info
;
4261 int nr
,working
,active
,failed
,spare
;
4264 nr
=working
=active
=failed
=spare
=0;
4265 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4267 if (test_bit(Faulty
, &rdev
->flags
))
4271 if (test_bit(In_sync
, &rdev
->flags
))
4278 info
.major_version
= mddev
->major_version
;
4279 info
.minor_version
= mddev
->minor_version
;
4280 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4281 info
.ctime
= mddev
->ctime
;
4282 info
.level
= mddev
->level
;
4283 info
.size
= mddev
->size
;
4284 if (info
.size
!= mddev
->size
) /* overflow */
4287 info
.raid_disks
= mddev
->raid_disks
;
4288 info
.md_minor
= mddev
->md_minor
;
4289 info
.not_persistent
= !mddev
->persistent
;
4291 info
.utime
= mddev
->utime
;
4294 info
.state
= (1<<MD_SB_CLEAN
);
4295 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4296 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4297 info
.active_disks
= active
;
4298 info
.working_disks
= working
;
4299 info
.failed_disks
= failed
;
4300 info
.spare_disks
= spare
;
4302 info
.layout
= mddev
->layout
;
4303 info
.chunk_size
= mddev
->chunk_size
;
4305 if (copy_to_user(arg
, &info
, sizeof(info
)))
4311 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4313 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4314 char *ptr
, *buf
= NULL
;
4317 if (md_allow_write(mddev
))
4318 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4320 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4325 /* bitmap disabled, zero the first byte and copy out */
4326 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4327 file
->pathname
[0] = '\0';
4331 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4335 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4339 strcpy(file
->pathname
, ptr
);
4343 if (copy_to_user(arg
, file
, sizeof(*file
)))
4351 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4353 mdu_disk_info_t info
;
4356 if (copy_from_user(&info
, arg
, sizeof(info
)))
4359 rdev
= find_rdev_nr(mddev
, info
.number
);
4361 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4362 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4363 info
.raid_disk
= rdev
->raid_disk
;
4365 if (test_bit(Faulty
, &rdev
->flags
))
4366 info
.state
|= (1<<MD_DISK_FAULTY
);
4367 else if (test_bit(In_sync
, &rdev
->flags
)) {
4368 info
.state
|= (1<<MD_DISK_ACTIVE
);
4369 info
.state
|= (1<<MD_DISK_SYNC
);
4371 if (test_bit(WriteMostly
, &rdev
->flags
))
4372 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4374 info
.major
= info
.minor
= 0;
4375 info
.raid_disk
= -1;
4376 info
.state
= (1<<MD_DISK_REMOVED
);
4379 if (copy_to_user(arg
, &info
, sizeof(info
)))
4385 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4387 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4389 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4391 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4394 if (!mddev
->raid_disks
) {
4396 /* expecting a device which has a superblock */
4397 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4400 "md: md_import_device returned %ld\n",
4402 return PTR_ERR(rdev
);
4404 if (!list_empty(&mddev
->disks
)) {
4405 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4406 mdk_rdev_t
, same_set
);
4407 int err
= super_types
[mddev
->major_version
]
4408 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4411 "md: %s has different UUID to %s\n",
4412 bdevname(rdev
->bdev
,b
),
4413 bdevname(rdev0
->bdev
,b2
));
4418 err
= bind_rdev_to_array(rdev
, mddev
);
4425 * add_new_disk can be used once the array is assembled
4426 * to add "hot spares". They must already have a superblock
4431 if (!mddev
->pers
->hot_add_disk
) {
4433 "%s: personality does not support diskops!\n",
4437 if (mddev
->persistent
)
4438 rdev
= md_import_device(dev
, mddev
->major_version
,
4439 mddev
->minor_version
);
4441 rdev
= md_import_device(dev
, -1, -1);
4444 "md: md_import_device returned %ld\n",
4446 return PTR_ERR(rdev
);
4448 /* set save_raid_disk if appropriate */
4449 if (!mddev
->persistent
) {
4450 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4451 info
->raid_disk
< mddev
->raid_disks
)
4452 rdev
->raid_disk
= info
->raid_disk
;
4454 rdev
->raid_disk
= -1;
4456 super_types
[mddev
->major_version
].
4457 validate_super(mddev
, rdev
);
4458 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4460 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4461 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4462 set_bit(WriteMostly
, &rdev
->flags
);
4464 rdev
->raid_disk
= -1;
4465 err
= bind_rdev_to_array(rdev
, mddev
);
4466 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4467 /* If there is hot_add_disk but no hot_remove_disk
4468 * then added disks for geometry changes,
4469 * and should be added immediately.
4471 super_types
[mddev
->major_version
].
4472 validate_super(mddev
, rdev
);
4473 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4475 unbind_rdev_from_array(rdev
);
4480 sysfs_notify_dirent(rdev
->sysfs_state
);
4482 md_update_sb(mddev
, 1);
4483 if (mddev
->degraded
)
4484 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4485 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4486 md_wakeup_thread(mddev
->thread
);
4490 /* otherwise, add_new_disk is only allowed
4491 * for major_version==0 superblocks
4493 if (mddev
->major_version
!= 0) {
4494 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4499 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4501 rdev
= md_import_device(dev
, -1, 0);
4504 "md: error, md_import_device() returned %ld\n",
4506 return PTR_ERR(rdev
);
4508 rdev
->desc_nr
= info
->number
;
4509 if (info
->raid_disk
< mddev
->raid_disks
)
4510 rdev
->raid_disk
= info
->raid_disk
;
4512 rdev
->raid_disk
= -1;
4514 if (rdev
->raid_disk
< mddev
->raid_disks
)
4515 if (info
->state
& (1<<MD_DISK_SYNC
))
4516 set_bit(In_sync
, &rdev
->flags
);
4518 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4519 set_bit(WriteMostly
, &rdev
->flags
);
4521 if (!mddev
->persistent
) {
4522 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4523 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4525 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4526 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4528 err
= bind_rdev_to_array(rdev
, mddev
);
4538 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4540 char b
[BDEVNAME_SIZE
];
4543 rdev
= find_rdev(mddev
, dev
);
4547 if (rdev
->raid_disk
>= 0)
4550 kick_rdev_from_array(rdev
);
4551 md_update_sb(mddev
, 1);
4552 md_new_event(mddev
);
4556 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4557 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4561 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4563 char b
[BDEVNAME_SIZE
];
4570 if (mddev
->major_version
!= 0) {
4571 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4572 " version-0 superblocks.\n",
4576 if (!mddev
->pers
->hot_add_disk
) {
4578 "%s: personality does not support diskops!\n",
4583 rdev
= md_import_device(dev
, -1, 0);
4586 "md: error, md_import_device() returned %ld\n",
4591 if (mddev
->persistent
)
4592 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4594 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4596 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4598 if (test_bit(Faulty
, &rdev
->flags
)) {
4600 "md: can not hot-add faulty %s disk to %s!\n",
4601 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4605 clear_bit(In_sync
, &rdev
->flags
);
4607 rdev
->saved_raid_disk
= -1;
4608 err
= bind_rdev_to_array(rdev
, mddev
);
4613 * The rest should better be atomic, we can have disk failures
4614 * noticed in interrupt contexts ...
4617 if (rdev
->desc_nr
== mddev
->max_disks
) {
4618 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4621 goto abort_unbind_export
;
4624 rdev
->raid_disk
= -1;
4626 md_update_sb(mddev
, 1);
4629 * Kick recovery, maybe this spare has to be added to the
4630 * array immediately.
4632 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4633 md_wakeup_thread(mddev
->thread
);
4634 md_new_event(mddev
);
4637 abort_unbind_export
:
4638 unbind_rdev_from_array(rdev
);
4645 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4650 if (!mddev
->pers
->quiesce
)
4652 if (mddev
->recovery
|| mddev
->sync_thread
)
4654 /* we should be able to change the bitmap.. */
4660 return -EEXIST
; /* cannot add when bitmap is present */
4661 mddev
->bitmap_file
= fget(fd
);
4663 if (mddev
->bitmap_file
== NULL
) {
4664 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4669 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4671 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4673 fput(mddev
->bitmap_file
);
4674 mddev
->bitmap_file
= NULL
;
4677 mddev
->bitmap_offset
= 0; /* file overrides offset */
4678 } else if (mddev
->bitmap
== NULL
)
4679 return -ENOENT
; /* cannot remove what isn't there */
4682 mddev
->pers
->quiesce(mddev
, 1);
4684 err
= bitmap_create(mddev
);
4685 if (fd
< 0 || err
) {
4686 bitmap_destroy(mddev
);
4687 fd
= -1; /* make sure to put the file */
4689 mddev
->pers
->quiesce(mddev
, 0);
4692 if (mddev
->bitmap_file
) {
4693 restore_bitmap_write_access(mddev
->bitmap_file
);
4694 fput(mddev
->bitmap_file
);
4696 mddev
->bitmap_file
= NULL
;
4703 * set_array_info is used two different ways
4704 * The original usage is when creating a new array.
4705 * In this usage, raid_disks is > 0 and it together with
4706 * level, size, not_persistent,layout,chunksize determine the
4707 * shape of the array.
4708 * This will always create an array with a type-0.90.0 superblock.
4709 * The newer usage is when assembling an array.
4710 * In this case raid_disks will be 0, and the major_version field is
4711 * use to determine which style super-blocks are to be found on the devices.
4712 * The minor and patch _version numbers are also kept incase the
4713 * super_block handler wishes to interpret them.
4715 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4718 if (info
->raid_disks
== 0) {
4719 /* just setting version number for superblock loading */
4720 if (info
->major_version
< 0 ||
4721 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4722 super_types
[info
->major_version
].name
== NULL
) {
4723 /* maybe try to auto-load a module? */
4725 "md: superblock version %d not known\n",
4726 info
->major_version
);
4729 mddev
->major_version
= info
->major_version
;
4730 mddev
->minor_version
= info
->minor_version
;
4731 mddev
->patch_version
= info
->patch_version
;
4732 mddev
->persistent
= !info
->not_persistent
;
4735 mddev
->major_version
= MD_MAJOR_VERSION
;
4736 mddev
->minor_version
= MD_MINOR_VERSION
;
4737 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4738 mddev
->ctime
= get_seconds();
4740 mddev
->level
= info
->level
;
4741 mddev
->clevel
[0] = 0;
4742 mddev
->size
= info
->size
;
4743 mddev
->raid_disks
= info
->raid_disks
;
4744 /* don't set md_minor, it is determined by which /dev/md* was
4747 if (info
->state
& (1<<MD_SB_CLEAN
))
4748 mddev
->recovery_cp
= MaxSector
;
4750 mddev
->recovery_cp
= 0;
4751 mddev
->persistent
= ! info
->not_persistent
;
4752 mddev
->external
= 0;
4754 mddev
->layout
= info
->layout
;
4755 mddev
->chunk_size
= info
->chunk_size
;
4757 mddev
->max_disks
= MD_SB_DISKS
;
4759 if (mddev
->persistent
)
4761 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4763 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4764 mddev
->bitmap_offset
= 0;
4766 mddev
->reshape_position
= MaxSector
;
4769 * Generate a 128 bit UUID
4771 get_random_bytes(mddev
->uuid
, 16);
4773 mddev
->new_level
= mddev
->level
;
4774 mddev
->new_chunk
= mddev
->chunk_size
;
4775 mddev
->new_layout
= mddev
->layout
;
4776 mddev
->delta_disks
= 0;
4781 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
4785 int fit
= (num_sectors
== 0);
4787 if (mddev
->pers
->resize
== NULL
)
4789 /* The "num_sectors" is the number of sectors of each device that
4790 * is used. This can only make sense for arrays with redundancy.
4791 * linear and raid0 always use whatever space is available. We can only
4792 * consider changing this number if no resync or reconstruction is
4793 * happening, and if the new size is acceptable. It must fit before the
4794 * sb_start or, if that is <data_offset, it must fit before the size
4795 * of each device. If num_sectors is zero, we find the largest size
4799 if (mddev
->sync_thread
)
4802 /* Sorry, cannot grow a bitmap yet, just remove it,
4806 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4808 avail
= rdev
->size
* 2;
4810 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
4811 num_sectors
= avail
;
4812 if (avail
< num_sectors
)
4815 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
4817 struct block_device
*bdev
;
4819 bdev
= bdget_disk(mddev
->gendisk
, 0);
4821 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4822 i_size_write(bdev
->bd_inode
,
4823 (loff_t
)mddev
->array_sectors
<< 9);
4824 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4831 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4834 /* change the number of raid disks */
4835 if (mddev
->pers
->check_reshape
== NULL
)
4837 if (raid_disks
<= 0 ||
4838 raid_disks
>= mddev
->max_disks
)
4840 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4842 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4844 rv
= mddev
->pers
->check_reshape(mddev
);
4850 * update_array_info is used to change the configuration of an
4852 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4853 * fields in the info are checked against the array.
4854 * Any differences that cannot be handled will cause an error.
4855 * Normally, only one change can be managed at a time.
4857 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4863 /* calculate expected state,ignoring low bits */
4864 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4865 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4867 if (mddev
->major_version
!= info
->major_version
||
4868 mddev
->minor_version
!= info
->minor_version
||
4869 /* mddev->patch_version != info->patch_version || */
4870 mddev
->ctime
!= info
->ctime
||
4871 mddev
->level
!= info
->level
||
4872 /* mddev->layout != info->layout || */
4873 !mddev
->persistent
!= info
->not_persistent
||
4874 mddev
->chunk_size
!= info
->chunk_size
||
4875 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4876 ((state
^info
->state
) & 0xfffffe00)
4879 /* Check there is only one change */
4880 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4881 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4882 if (mddev
->layout
!= info
->layout
) cnt
++;
4883 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4884 if (cnt
== 0) return 0;
4885 if (cnt
> 1) return -EINVAL
;
4887 if (mddev
->layout
!= info
->layout
) {
4889 * we don't need to do anything at the md level, the
4890 * personality will take care of it all.
4892 if (mddev
->pers
->reconfig
== NULL
)
4895 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4897 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4898 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
4900 if (mddev
->raid_disks
!= info
->raid_disks
)
4901 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4903 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4904 if (mddev
->pers
->quiesce
== NULL
)
4906 if (mddev
->recovery
|| mddev
->sync_thread
)
4908 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4909 /* add the bitmap */
4912 if (mddev
->default_bitmap_offset
== 0)
4914 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4915 mddev
->pers
->quiesce(mddev
, 1);
4916 rv
= bitmap_create(mddev
);
4918 bitmap_destroy(mddev
);
4919 mddev
->pers
->quiesce(mddev
, 0);
4921 /* remove the bitmap */
4924 if (mddev
->bitmap
->file
)
4926 mddev
->pers
->quiesce(mddev
, 1);
4927 bitmap_destroy(mddev
);
4928 mddev
->pers
->quiesce(mddev
, 0);
4929 mddev
->bitmap_offset
= 0;
4932 md_update_sb(mddev
, 1);
4936 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4940 if (mddev
->pers
== NULL
)
4943 rdev
= find_rdev(mddev
, dev
);
4947 md_error(mddev
, rdev
);
4952 * We have a problem here : there is no easy way to give a CHS
4953 * virtual geometry. We currently pretend that we have a 2 heads
4954 * 4 sectors (with a BIG number of cylinders...). This drives
4955 * dosfs just mad... ;-)
4957 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4959 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4963 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4967 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
4968 unsigned int cmd
, unsigned long arg
)
4971 void __user
*argp
= (void __user
*)arg
;
4972 mddev_t
*mddev
= NULL
;
4974 if (!capable(CAP_SYS_ADMIN
))
4978 * Commands dealing with the RAID driver but not any
4984 err
= get_version(argp
);
4987 case PRINT_RAID_DEBUG
:
4995 autostart_arrays(arg
);
5002 * Commands creating/starting a new array:
5005 mddev
= bdev
->bd_disk
->private_data
;
5012 err
= mddev_lock(mddev
);
5015 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5022 case SET_ARRAY_INFO
:
5024 mdu_array_info_t info
;
5026 memset(&info
, 0, sizeof(info
));
5027 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5032 err
= update_array_info(mddev
, &info
);
5034 printk(KERN_WARNING
"md: couldn't update"
5035 " array info. %d\n", err
);
5040 if (!list_empty(&mddev
->disks
)) {
5042 "md: array %s already has disks!\n",
5047 if (mddev
->raid_disks
) {
5049 "md: array %s already initialised!\n",
5054 err
= set_array_info(mddev
, &info
);
5056 printk(KERN_WARNING
"md: couldn't set"
5057 " array info. %d\n", err
);
5067 * Commands querying/configuring an existing array:
5069 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5070 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5071 if ((!mddev
->raid_disks
&& !mddev
->external
)
5072 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5073 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5074 && cmd
!= GET_BITMAP_FILE
) {
5080 * Commands even a read-only array can execute:
5084 case GET_ARRAY_INFO
:
5085 err
= get_array_info(mddev
, argp
);
5088 case GET_BITMAP_FILE
:
5089 err
= get_bitmap_file(mddev
, argp
);
5093 err
= get_disk_info(mddev
, argp
);
5096 case RESTART_ARRAY_RW
:
5097 err
= restart_array(mddev
);
5101 err
= do_md_stop(mddev
, 0, 1);
5105 err
= do_md_stop(mddev
, 1, 1);
5111 * The remaining ioctls are changing the state of the
5112 * superblock, so we do not allow them on read-only arrays.
5113 * However non-MD ioctls (e.g. get-size) will still come through
5114 * here and hit the 'default' below, so only disallow
5115 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5117 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5118 if (mddev
->ro
== 2) {
5120 sysfs_notify_dirent(mddev
->sysfs_state
);
5121 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5122 md_wakeup_thread(mddev
->thread
);
5133 mdu_disk_info_t info
;
5134 if (copy_from_user(&info
, argp
, sizeof(info
)))
5137 err
= add_new_disk(mddev
, &info
);
5141 case HOT_REMOVE_DISK
:
5142 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5146 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5149 case SET_DISK_FAULTY
:
5150 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5154 err
= do_md_run(mddev
);
5157 case SET_BITMAP_FILE
:
5158 err
= set_bitmap_file(mddev
, (int)arg
);
5168 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5170 mddev
->hold_active
= 0;
5171 mddev_unlock(mddev
);
5181 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5184 * Succeed if we can lock the mddev, which confirms that
5185 * it isn't being stopped right now.
5187 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5190 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5191 /* we are racing with mddev_put which is discarding this
5195 /* Wait until bdev->bd_disk is definitely gone */
5196 flush_scheduled_work();
5197 /* Then retry the open from the top */
5198 return -ERESTARTSYS
;
5200 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5202 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5206 atomic_inc(&mddev
->openers
);
5207 mddev_unlock(mddev
);
5209 check_disk_change(bdev
);
5214 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5216 mddev_t
*mddev
= disk
->private_data
;
5219 atomic_dec(&mddev
->openers
);
5225 static int md_media_changed(struct gendisk
*disk
)
5227 mddev_t
*mddev
= disk
->private_data
;
5229 return mddev
->changed
;
5232 static int md_revalidate(struct gendisk
*disk
)
5234 mddev_t
*mddev
= disk
->private_data
;
5239 static struct block_device_operations md_fops
=
5241 .owner
= THIS_MODULE
,
5243 .release
= md_release
,
5244 .locked_ioctl
= md_ioctl
,
5245 .getgeo
= md_getgeo
,
5246 .media_changed
= md_media_changed
,
5247 .revalidate_disk
= md_revalidate
,
5250 static int md_thread(void * arg
)
5252 mdk_thread_t
*thread
= arg
;
5255 * md_thread is a 'system-thread', it's priority should be very
5256 * high. We avoid resource deadlocks individually in each
5257 * raid personality. (RAID5 does preallocation) We also use RR and
5258 * the very same RT priority as kswapd, thus we will never get
5259 * into a priority inversion deadlock.
5261 * we definitely have to have equal or higher priority than
5262 * bdflush, otherwise bdflush will deadlock if there are too
5263 * many dirty RAID5 blocks.
5266 allow_signal(SIGKILL
);
5267 while (!kthread_should_stop()) {
5269 /* We need to wait INTERRUPTIBLE so that
5270 * we don't add to the load-average.
5271 * That means we need to be sure no signals are
5274 if (signal_pending(current
))
5275 flush_signals(current
);
5277 wait_event_interruptible_timeout
5279 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5280 || kthread_should_stop(),
5283 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5285 thread
->run(thread
->mddev
);
5291 void md_wakeup_thread(mdk_thread_t
*thread
)
5294 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5295 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5296 wake_up(&thread
->wqueue
);
5300 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5303 mdk_thread_t
*thread
;
5305 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5309 init_waitqueue_head(&thread
->wqueue
);
5312 thread
->mddev
= mddev
;
5313 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5314 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5315 if (IS_ERR(thread
->tsk
)) {
5322 void md_unregister_thread(mdk_thread_t
*thread
)
5324 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5326 kthread_stop(thread
->tsk
);
5330 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5337 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5340 if (mddev
->external
)
5341 set_bit(Blocked
, &rdev
->flags
);
5343 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5345 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5346 __builtin_return_address(0),__builtin_return_address(1),
5347 __builtin_return_address(2),__builtin_return_address(3));
5351 if (!mddev
->pers
->error_handler
)
5353 mddev
->pers
->error_handler(mddev
,rdev
);
5354 if (mddev
->degraded
)
5355 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5356 set_bit(StateChanged
, &rdev
->flags
);
5357 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5358 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5359 md_wakeup_thread(mddev
->thread
);
5360 md_new_event_inintr(mddev
);
5363 /* seq_file implementation /proc/mdstat */
5365 static void status_unused(struct seq_file
*seq
)
5370 seq_printf(seq
, "unused devices: ");
5372 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5373 char b
[BDEVNAME_SIZE
];
5375 seq_printf(seq
, "%s ",
5376 bdevname(rdev
->bdev
,b
));
5379 seq_printf(seq
, "<none>");
5381 seq_printf(seq
, "\n");
5385 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5387 sector_t max_blocks
, resync
, res
;
5388 unsigned long dt
, db
, rt
;
5390 unsigned int per_milli
;
5392 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5394 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5395 max_blocks
= mddev
->resync_max_sectors
>> 1;
5397 max_blocks
= mddev
->size
;
5400 * Should not happen.
5406 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5407 * in a sector_t, and (max_blocks>>scale) will fit in a
5408 * u32, as those are the requirements for sector_div.
5409 * Thus 'scale' must be at least 10
5412 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5413 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5416 res
= (resync
>>scale
)*1000;
5417 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5421 int i
, x
= per_milli
/50, y
= 20-x
;
5422 seq_printf(seq
, "[");
5423 for (i
= 0; i
< x
; i
++)
5424 seq_printf(seq
, "=");
5425 seq_printf(seq
, ">");
5426 for (i
= 0; i
< y
; i
++)
5427 seq_printf(seq
, ".");
5428 seq_printf(seq
, "] ");
5430 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5431 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5433 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5435 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5436 "resync" : "recovery"))),
5437 per_milli
/10, per_milli
% 10,
5438 (unsigned long long) resync
,
5439 (unsigned long long) max_blocks
);
5442 * We do not want to overflow, so the order of operands and
5443 * the * 100 / 100 trick are important. We do a +1 to be
5444 * safe against division by zero. We only estimate anyway.
5446 * dt: time from mark until now
5447 * db: blocks written from mark until now
5448 * rt: remaining time
5450 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5452 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5453 - mddev
->resync_mark_cnt
;
5454 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5456 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5458 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5461 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5463 struct list_head
*tmp
;
5473 spin_lock(&all_mddevs_lock
);
5474 list_for_each(tmp
,&all_mddevs
)
5476 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5478 spin_unlock(&all_mddevs_lock
);
5481 spin_unlock(&all_mddevs_lock
);
5483 return (void*)2;/* tail */
5487 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5489 struct list_head
*tmp
;
5490 mddev_t
*next_mddev
, *mddev
= v
;
5496 spin_lock(&all_mddevs_lock
);
5498 tmp
= all_mddevs
.next
;
5500 tmp
= mddev
->all_mddevs
.next
;
5501 if (tmp
!= &all_mddevs
)
5502 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5504 next_mddev
= (void*)2;
5507 spin_unlock(&all_mddevs_lock
);
5515 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5519 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5523 struct mdstat_info
{
5527 static int md_seq_show(struct seq_file
*seq
, void *v
)
5532 struct mdstat_info
*mi
= seq
->private;
5533 struct bitmap
*bitmap
;
5535 if (v
== (void*)1) {
5536 struct mdk_personality
*pers
;
5537 seq_printf(seq
, "Personalities : ");
5538 spin_lock(&pers_lock
);
5539 list_for_each_entry(pers
, &pers_list
, list
)
5540 seq_printf(seq
, "[%s] ", pers
->name
);
5542 spin_unlock(&pers_lock
);
5543 seq_printf(seq
, "\n");
5544 mi
->event
= atomic_read(&md_event_count
);
5547 if (v
== (void*)2) {
5552 if (mddev_lock(mddev
) < 0)
5555 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5556 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5557 mddev
->pers
? "" : "in");
5560 seq_printf(seq
, " (read-only)");
5562 seq_printf(seq
, " (auto-read-only)");
5563 seq_printf(seq
, " %s", mddev
->pers
->name
);
5567 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5568 char b
[BDEVNAME_SIZE
];
5569 seq_printf(seq
, " %s[%d]",
5570 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5571 if (test_bit(WriteMostly
, &rdev
->flags
))
5572 seq_printf(seq
, "(W)");
5573 if (test_bit(Faulty
, &rdev
->flags
)) {
5574 seq_printf(seq
, "(F)");
5576 } else if (rdev
->raid_disk
< 0)
5577 seq_printf(seq
, "(S)"); /* spare */
5581 if (!list_empty(&mddev
->disks
)) {
5583 seq_printf(seq
, "\n %llu blocks",
5584 (unsigned long long)
5585 mddev
->array_sectors
/ 2);
5587 seq_printf(seq
, "\n %llu blocks",
5588 (unsigned long long)size
);
5590 if (mddev
->persistent
) {
5591 if (mddev
->major_version
!= 0 ||
5592 mddev
->minor_version
!= 90) {
5593 seq_printf(seq
," super %d.%d",
5594 mddev
->major_version
,
5595 mddev
->minor_version
);
5597 } else if (mddev
->external
)
5598 seq_printf(seq
, " super external:%s",
5599 mddev
->metadata_type
);
5601 seq_printf(seq
, " super non-persistent");
5604 mddev
->pers
->status(seq
, mddev
);
5605 seq_printf(seq
, "\n ");
5606 if (mddev
->pers
->sync_request
) {
5607 if (mddev
->curr_resync
> 2) {
5608 status_resync(seq
, mddev
);
5609 seq_printf(seq
, "\n ");
5610 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5611 seq_printf(seq
, "\tresync=DELAYED\n ");
5612 else if (mddev
->recovery_cp
< MaxSector
)
5613 seq_printf(seq
, "\tresync=PENDING\n ");
5616 seq_printf(seq
, "\n ");
5618 if ((bitmap
= mddev
->bitmap
)) {
5619 unsigned long chunk_kb
;
5620 unsigned long flags
;
5621 spin_lock_irqsave(&bitmap
->lock
, flags
);
5622 chunk_kb
= bitmap
->chunksize
>> 10;
5623 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5625 bitmap
->pages
- bitmap
->missing_pages
,
5627 (bitmap
->pages
- bitmap
->missing_pages
)
5628 << (PAGE_SHIFT
- 10),
5629 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5630 chunk_kb
? "KB" : "B");
5632 seq_printf(seq
, ", file: ");
5633 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5636 seq_printf(seq
, "\n");
5637 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5640 seq_printf(seq
, "\n");
5642 mddev_unlock(mddev
);
5647 static struct seq_operations md_seq_ops
= {
5648 .start
= md_seq_start
,
5649 .next
= md_seq_next
,
5650 .stop
= md_seq_stop
,
5651 .show
= md_seq_show
,
5654 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5657 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5661 error
= seq_open(file
, &md_seq_ops
);
5665 struct seq_file
*p
= file
->private_data
;
5667 mi
->event
= atomic_read(&md_event_count
);
5672 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5674 struct seq_file
*m
= filp
->private_data
;
5675 struct mdstat_info
*mi
= m
->private;
5678 poll_wait(filp
, &md_event_waiters
, wait
);
5680 /* always allow read */
5681 mask
= POLLIN
| POLLRDNORM
;
5683 if (mi
->event
!= atomic_read(&md_event_count
))
5684 mask
|= POLLERR
| POLLPRI
;
5688 static const struct file_operations md_seq_fops
= {
5689 .owner
= THIS_MODULE
,
5690 .open
= md_seq_open
,
5692 .llseek
= seq_lseek
,
5693 .release
= seq_release_private
,
5694 .poll
= mdstat_poll
,
5697 int register_md_personality(struct mdk_personality
*p
)
5699 spin_lock(&pers_lock
);
5700 list_add_tail(&p
->list
, &pers_list
);
5701 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5702 spin_unlock(&pers_lock
);
5706 int unregister_md_personality(struct mdk_personality
*p
)
5708 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5709 spin_lock(&pers_lock
);
5710 list_del_init(&p
->list
);
5711 spin_unlock(&pers_lock
);
5715 static int is_mddev_idle(mddev_t
*mddev
)
5723 rdev_for_each_rcu(rdev
, mddev
) {
5724 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5725 curr_events
= part_stat_read(&disk
->part0
, sectors
[0]) +
5726 part_stat_read(&disk
->part0
, sectors
[1]) -
5727 atomic_read(&disk
->sync_io
);
5728 /* sync IO will cause sync_io to increase before the disk_stats
5729 * as sync_io is counted when a request starts, and
5730 * disk_stats is counted when it completes.
5731 * So resync activity will cause curr_events to be smaller than
5732 * when there was no such activity.
5733 * non-sync IO will cause disk_stat to increase without
5734 * increasing sync_io so curr_events will (eventually)
5735 * be larger than it was before. Once it becomes
5736 * substantially larger, the test below will cause
5737 * the array to appear non-idle, and resync will slow
5739 * If there is a lot of outstanding resync activity when
5740 * we set last_event to curr_events, then all that activity
5741 * completing might cause the array to appear non-idle
5742 * and resync will be slowed down even though there might
5743 * not have been non-resync activity. This will only
5744 * happen once though. 'last_events' will soon reflect
5745 * the state where there is little or no outstanding
5746 * resync requests, and further resync activity will
5747 * always make curr_events less than last_events.
5750 if (curr_events
- rdev
->last_events
> 4096) {
5751 rdev
->last_events
= curr_events
;
5759 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5761 /* another "blocks" (512byte) blocks have been synced */
5762 atomic_sub(blocks
, &mddev
->recovery_active
);
5763 wake_up(&mddev
->recovery_wait
);
5765 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5766 md_wakeup_thread(mddev
->thread
);
5767 // stop recovery, signal do_sync ....
5772 /* md_write_start(mddev, bi)
5773 * If we need to update some array metadata (e.g. 'active' flag
5774 * in superblock) before writing, schedule a superblock update
5775 * and wait for it to complete.
5777 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5780 if (bio_data_dir(bi
) != WRITE
)
5783 BUG_ON(mddev
->ro
== 1);
5784 if (mddev
->ro
== 2) {
5785 /* need to switch to read/write */
5787 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5788 md_wakeup_thread(mddev
->thread
);
5789 md_wakeup_thread(mddev
->sync_thread
);
5792 atomic_inc(&mddev
->writes_pending
);
5793 if (mddev
->safemode
== 1)
5794 mddev
->safemode
= 0;
5795 if (mddev
->in_sync
) {
5796 spin_lock_irq(&mddev
->write_lock
);
5797 if (mddev
->in_sync
) {
5799 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5800 md_wakeup_thread(mddev
->thread
);
5803 spin_unlock_irq(&mddev
->write_lock
);
5806 sysfs_notify_dirent(mddev
->sysfs_state
);
5807 wait_event(mddev
->sb_wait
,
5808 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5809 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5812 void md_write_end(mddev_t
*mddev
)
5814 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5815 if (mddev
->safemode
== 2)
5816 md_wakeup_thread(mddev
->thread
);
5817 else if (mddev
->safemode_delay
)
5818 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5822 /* md_allow_write(mddev)
5823 * Calling this ensures that the array is marked 'active' so that writes
5824 * may proceed without blocking. It is important to call this before
5825 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5826 * Must be called with mddev_lock held.
5828 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5829 * is dropped, so return -EAGAIN after notifying userspace.
5831 int md_allow_write(mddev_t
*mddev
)
5837 if (!mddev
->pers
->sync_request
)
5840 spin_lock_irq(&mddev
->write_lock
);
5841 if (mddev
->in_sync
) {
5843 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5844 if (mddev
->safemode_delay
&&
5845 mddev
->safemode
== 0)
5846 mddev
->safemode
= 1;
5847 spin_unlock_irq(&mddev
->write_lock
);
5848 md_update_sb(mddev
, 0);
5849 sysfs_notify_dirent(mddev
->sysfs_state
);
5851 spin_unlock_irq(&mddev
->write_lock
);
5853 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
5858 EXPORT_SYMBOL_GPL(md_allow_write
);
5860 #define SYNC_MARKS 10
5861 #define SYNC_MARK_STEP (3*HZ)
5862 void md_do_sync(mddev_t
*mddev
)
5865 unsigned int currspeed
= 0,
5867 sector_t max_sectors
,j
, io_sectors
;
5868 unsigned long mark
[SYNC_MARKS
];
5869 sector_t mark_cnt
[SYNC_MARKS
];
5871 struct list_head
*tmp
;
5872 sector_t last_check
;
5877 /* just incase thread restarts... */
5878 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5880 if (mddev
->ro
) /* never try to sync a read-only array */
5883 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5884 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5885 desc
= "data-check";
5886 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5887 desc
= "requested-resync";
5890 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5895 /* we overload curr_resync somewhat here.
5896 * 0 == not engaged in resync at all
5897 * 2 == checking that there is no conflict with another sync
5898 * 1 == like 2, but have yielded to allow conflicting resync to
5900 * other == active in resync - this many blocks
5902 * Before starting a resync we must have set curr_resync to
5903 * 2, and then checked that every "conflicting" array has curr_resync
5904 * less than ours. When we find one that is the same or higher
5905 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5906 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5907 * This will mean we have to start checking from the beginning again.
5912 mddev
->curr_resync
= 2;
5915 if (kthread_should_stop()) {
5916 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5919 for_each_mddev(mddev2
, tmp
) {
5920 if (mddev2
== mddev
)
5922 if (!mddev
->parallel_resync
5923 && mddev2
->curr_resync
5924 && match_mddev_units(mddev
, mddev2
)) {
5926 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5927 /* arbitrarily yield */
5928 mddev
->curr_resync
= 1;
5929 wake_up(&resync_wait
);
5931 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5932 /* no need to wait here, we can wait the next
5933 * time 'round when curr_resync == 2
5936 /* We need to wait 'interruptible' so as not to
5937 * contribute to the load average, and not to
5938 * be caught by 'softlockup'
5940 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
5941 if (!kthread_should_stop() &&
5942 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5943 printk(KERN_INFO
"md: delaying %s of %s"
5944 " until %s has finished (they"
5945 " share one or more physical units)\n",
5946 desc
, mdname(mddev
), mdname(mddev2
));
5948 if (signal_pending(current
))
5949 flush_signals(current
);
5951 finish_wait(&resync_wait
, &wq
);
5954 finish_wait(&resync_wait
, &wq
);
5957 } while (mddev
->curr_resync
< 2);
5960 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5961 /* resync follows the size requested by the personality,
5962 * which defaults to physical size, but can be virtual size
5964 max_sectors
= mddev
->resync_max_sectors
;
5965 mddev
->resync_mismatches
= 0;
5966 /* we don't use the checkpoint if there's a bitmap */
5967 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5968 j
= mddev
->resync_min
;
5969 else if (!mddev
->bitmap
)
5970 j
= mddev
->recovery_cp
;
5972 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5973 max_sectors
= mddev
->size
<< 1;
5975 /* recovery follows the physical size of devices */
5976 max_sectors
= mddev
->size
<< 1;
5978 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
5979 if (rdev
->raid_disk
>= 0 &&
5980 !test_bit(Faulty
, &rdev
->flags
) &&
5981 !test_bit(In_sync
, &rdev
->flags
) &&
5982 rdev
->recovery_offset
< j
)
5983 j
= rdev
->recovery_offset
;
5986 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5987 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5988 " %d KB/sec/disk.\n", speed_min(mddev
));
5989 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5990 "(but not more than %d KB/sec) for %s.\n",
5991 speed_max(mddev
), desc
);
5993 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5996 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5998 mark_cnt
[m
] = io_sectors
;
6001 mddev
->resync_mark
= mark
[last_mark
];
6002 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6005 * Tune reconstruction:
6007 window
= 32*(PAGE_SIZE
/512);
6008 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6009 window
/2,(unsigned long long) max_sectors
/2);
6011 atomic_set(&mddev
->recovery_active
, 0);
6016 "md: resuming %s of %s from checkpoint.\n",
6017 desc
, mdname(mddev
));
6018 mddev
->curr_resync
= j
;
6021 while (j
< max_sectors
) {
6025 if (j
>= mddev
->resync_max
) {
6026 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6027 wait_event(mddev
->recovery_wait
,
6028 mddev
->resync_max
> j
6029 || kthread_should_stop());
6031 if (kthread_should_stop())
6033 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6034 currspeed
< speed_min(mddev
));
6036 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6040 if (!skipped
) { /* actual IO requested */
6041 io_sectors
+= sectors
;
6042 atomic_add(sectors
, &mddev
->recovery_active
);
6046 if (j
>1) mddev
->curr_resync
= j
;
6047 mddev
->curr_mark_cnt
= io_sectors
;
6048 if (last_check
== 0)
6049 /* this is the earliers that rebuilt will be
6050 * visible in /proc/mdstat
6052 md_new_event(mddev
);
6054 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6057 last_check
= io_sectors
;
6059 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6063 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6065 int next
= (last_mark
+1) % SYNC_MARKS
;
6067 mddev
->resync_mark
= mark
[next
];
6068 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6069 mark
[next
] = jiffies
;
6070 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6075 if (kthread_should_stop())
6080 * this loop exits only if either when we are slower than
6081 * the 'hard' speed limit, or the system was IO-idle for
6083 * the system might be non-idle CPU-wise, but we only care
6084 * about not overloading the IO subsystem. (things like an
6085 * e2fsck being done on the RAID array should execute fast)
6087 blk_unplug(mddev
->queue
);
6090 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6091 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6093 if (currspeed
> speed_min(mddev
)) {
6094 if ((currspeed
> speed_max(mddev
)) ||
6095 !is_mddev_idle(mddev
)) {
6101 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6103 * this also signals 'finished resyncing' to md_stop
6106 blk_unplug(mddev
->queue
);
6108 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6110 /* tell personality that we are finished */
6111 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6113 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6114 mddev
->curr_resync
> 2) {
6115 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6116 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6117 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6119 "md: checkpointing %s of %s.\n",
6120 desc
, mdname(mddev
));
6121 mddev
->recovery_cp
= mddev
->curr_resync
;
6124 mddev
->recovery_cp
= MaxSector
;
6126 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6127 mddev
->curr_resync
= MaxSector
;
6128 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6129 if (rdev
->raid_disk
>= 0 &&
6130 !test_bit(Faulty
, &rdev
->flags
) &&
6131 !test_bit(In_sync
, &rdev
->flags
) &&
6132 rdev
->recovery_offset
< mddev
->curr_resync
)
6133 rdev
->recovery_offset
= mddev
->curr_resync
;
6136 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6139 mddev
->curr_resync
= 0;
6140 mddev
->resync_min
= 0;
6141 mddev
->resync_max
= MaxSector
;
6142 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6143 wake_up(&resync_wait
);
6144 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6145 md_wakeup_thread(mddev
->thread
);
6150 * got a signal, exit.
6153 "md: md_do_sync() got signal ... exiting\n");
6154 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6158 EXPORT_SYMBOL_GPL(md_do_sync
);
6161 static int remove_and_add_spares(mddev_t
*mddev
)
6166 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6167 if (rdev
->raid_disk
>= 0 &&
6168 !test_bit(Blocked
, &rdev
->flags
) &&
6169 (test_bit(Faulty
, &rdev
->flags
) ||
6170 ! test_bit(In_sync
, &rdev
->flags
)) &&
6171 atomic_read(&rdev
->nr_pending
)==0) {
6172 if (mddev
->pers
->hot_remove_disk(
6173 mddev
, rdev
->raid_disk
)==0) {
6175 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6176 sysfs_remove_link(&mddev
->kobj
, nm
);
6177 rdev
->raid_disk
= -1;
6181 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6182 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6183 if (rdev
->raid_disk
>= 0 &&
6184 !test_bit(In_sync
, &rdev
->flags
) &&
6185 !test_bit(Blocked
, &rdev
->flags
))
6187 if (rdev
->raid_disk
< 0
6188 && !test_bit(Faulty
, &rdev
->flags
)) {
6189 rdev
->recovery_offset
= 0;
6191 hot_add_disk(mddev
, rdev
) == 0) {
6193 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6194 if (sysfs_create_link(&mddev
->kobj
,
6197 "md: cannot register "
6201 md_new_event(mddev
);
6210 * This routine is regularly called by all per-raid-array threads to
6211 * deal with generic issues like resync and super-block update.
6212 * Raid personalities that don't have a thread (linear/raid0) do not
6213 * need this as they never do any recovery or update the superblock.
6215 * It does not do any resync itself, but rather "forks" off other threads
6216 * to do that as needed.
6217 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6218 * "->recovery" and create a thread at ->sync_thread.
6219 * When the thread finishes it sets MD_RECOVERY_DONE
6220 * and wakeups up this thread which will reap the thread and finish up.
6221 * This thread also removes any faulty devices (with nr_pending == 0).
6223 * The overall approach is:
6224 * 1/ if the superblock needs updating, update it.
6225 * 2/ If a recovery thread is running, don't do anything else.
6226 * 3/ If recovery has finished, clean up, possibly marking spares active.
6227 * 4/ If there are any faulty devices, remove them.
6228 * 5/ If array is degraded, try to add spares devices
6229 * 6/ If array has spares or is not in-sync, start a resync thread.
6231 void md_check_recovery(mddev_t
*mddev
)
6237 bitmap_daemon_work(mddev
->bitmap
);
6242 if (signal_pending(current
)) {
6243 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6244 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6246 mddev
->safemode
= 2;
6248 flush_signals(current
);
6251 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6254 (mddev
->flags
&& !mddev
->external
) ||
6255 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6256 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6257 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6258 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6259 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6263 if (mddev_trylock(mddev
)) {
6267 /* Only thing we do on a ro array is remove
6270 remove_and_add_spares(mddev
);
6271 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6275 if (!mddev
->external
) {
6277 spin_lock_irq(&mddev
->write_lock
);
6278 if (mddev
->safemode
&&
6279 !atomic_read(&mddev
->writes_pending
) &&
6281 mddev
->recovery_cp
== MaxSector
) {
6284 if (mddev
->persistent
)
6285 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6287 if (mddev
->safemode
== 1)
6288 mddev
->safemode
= 0;
6289 spin_unlock_irq(&mddev
->write_lock
);
6291 sysfs_notify_dirent(mddev
->sysfs_state
);
6295 md_update_sb(mddev
, 0);
6297 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6298 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6299 sysfs_notify_dirent(rdev
->sysfs_state
);
6302 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6303 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6304 /* resync/recovery still happening */
6305 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6308 if (mddev
->sync_thread
) {
6309 /* resync has finished, collect result */
6310 md_unregister_thread(mddev
->sync_thread
);
6311 mddev
->sync_thread
= NULL
;
6312 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6313 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6315 /* activate any spares */
6316 if (mddev
->pers
->spare_active(mddev
))
6317 sysfs_notify(&mddev
->kobj
, NULL
,
6320 md_update_sb(mddev
, 1);
6322 /* if array is no-longer degraded, then any saved_raid_disk
6323 * information must be scrapped
6325 if (!mddev
->degraded
)
6326 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6327 rdev
->saved_raid_disk
= -1;
6329 mddev
->recovery
= 0;
6330 /* flag recovery needed just to double check */
6331 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6332 sysfs_notify_dirent(mddev
->sysfs_action
);
6333 md_new_event(mddev
);
6336 /* Set RUNNING before clearing NEEDED to avoid
6337 * any transients in the value of "sync_action".
6339 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6340 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6341 /* Clear some bits that don't mean anything, but
6344 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6345 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6347 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6349 /* no recovery is running.
6350 * remove any failed drives, then
6351 * add spares if possible.
6352 * Spare are also removed and re-added, to allow
6353 * the personality to fail the re-add.
6356 if (mddev
->reshape_position
!= MaxSector
) {
6357 if (mddev
->pers
->check_reshape(mddev
) != 0)
6358 /* Cannot proceed */
6360 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6361 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6362 } else if ((spares
= remove_and_add_spares(mddev
))) {
6363 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6364 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6365 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6366 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6367 } else if (mddev
->recovery_cp
< MaxSector
) {
6368 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6369 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6370 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6371 /* nothing to be done ... */
6374 if (mddev
->pers
->sync_request
) {
6375 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6376 /* We are adding a device or devices to an array
6377 * which has the bitmap stored on all devices.
6378 * So make sure all bitmap pages get written
6380 bitmap_write_all(mddev
->bitmap
);
6382 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6385 if (!mddev
->sync_thread
) {
6386 printk(KERN_ERR
"%s: could not start resync"
6389 /* leave the spares where they are, it shouldn't hurt */
6390 mddev
->recovery
= 0;
6392 md_wakeup_thread(mddev
->sync_thread
);
6393 sysfs_notify_dirent(mddev
->sysfs_action
);
6394 md_new_event(mddev
);
6397 if (!mddev
->sync_thread
) {
6398 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6399 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6401 if (mddev
->sysfs_action
)
6402 sysfs_notify_dirent(mddev
->sysfs_action
);
6404 mddev_unlock(mddev
);
6408 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6410 sysfs_notify_dirent(rdev
->sysfs_state
);
6411 wait_event_timeout(rdev
->blocked_wait
,
6412 !test_bit(Blocked
, &rdev
->flags
),
6413 msecs_to_jiffies(5000));
6414 rdev_dec_pending(rdev
, mddev
);
6416 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6418 static int md_notify_reboot(struct notifier_block
*this,
6419 unsigned long code
, void *x
)
6421 struct list_head
*tmp
;
6424 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6426 printk(KERN_INFO
"md: stopping all md devices.\n");
6428 for_each_mddev(mddev
, tmp
)
6429 if (mddev_trylock(mddev
)) {
6430 /* Force a switch to readonly even array
6431 * appears to still be in use. Hence
6434 do_md_stop(mddev
, 1, 100);
6435 mddev_unlock(mddev
);
6438 * certain more exotic SCSI devices are known to be
6439 * volatile wrt too early system reboots. While the
6440 * right place to handle this issue is the given
6441 * driver, we do want to have a safe RAID driver ...
6448 static struct notifier_block md_notifier
= {
6449 .notifier_call
= md_notify_reboot
,
6451 .priority
= INT_MAX
, /* before any real devices */
6454 static void md_geninit(void)
6456 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6458 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6461 static int __init
md_init(void)
6463 if (register_blkdev(MAJOR_NR
, "md"))
6465 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6466 unregister_blkdev(MAJOR_NR
, "md");
6469 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6470 md_probe
, NULL
, NULL
);
6471 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6472 md_probe
, NULL
, NULL
);
6474 register_reboot_notifier(&md_notifier
);
6475 raid_table_header
= register_sysctl_table(raid_root_table
);
6485 * Searches all registered partitions for autorun RAID arrays
6489 static LIST_HEAD(all_detected_devices
);
6490 struct detected_devices_node
{
6491 struct list_head list
;
6495 void md_autodetect_dev(dev_t dev
)
6497 struct detected_devices_node
*node_detected_dev
;
6499 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6500 if (node_detected_dev
) {
6501 node_detected_dev
->dev
= dev
;
6502 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6504 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6505 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6510 static void autostart_arrays(int part
)
6513 struct detected_devices_node
*node_detected_dev
;
6515 int i_scanned
, i_passed
;
6520 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6522 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6524 node_detected_dev
= list_entry(all_detected_devices
.next
,
6525 struct detected_devices_node
, list
);
6526 list_del(&node_detected_dev
->list
);
6527 dev
= node_detected_dev
->dev
;
6528 kfree(node_detected_dev
);
6529 rdev
= md_import_device(dev
,0, 90);
6533 if (test_bit(Faulty
, &rdev
->flags
)) {
6537 set_bit(AutoDetected
, &rdev
->flags
);
6538 list_add(&rdev
->same_set
, &pending_raid_disks
);
6542 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6543 i_scanned
, i_passed
);
6545 autorun_devices(part
);
6548 #endif /* !MODULE */
6550 static __exit
void md_exit(void)
6553 struct list_head
*tmp
;
6555 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6556 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6558 unregister_blkdev(MAJOR_NR
,"md");
6559 unregister_blkdev(mdp_major
, "mdp");
6560 unregister_reboot_notifier(&md_notifier
);
6561 unregister_sysctl_table(raid_table_header
);
6562 remove_proc_entry("mdstat", NULL
);
6563 for_each_mddev(mddev
, tmp
) {
6564 export_array(mddev
);
6565 mddev
->hold_active
= 0;
6569 subsys_initcall(md_init
);
6570 module_exit(md_exit
)
6572 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6574 return sprintf(buffer
, "%d", start_readonly
);
6576 static int set_ro(const char *val
, struct kernel_param
*kp
)
6579 int num
= simple_strtoul(val
, &e
, 10);
6580 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6581 start_readonly
= num
;
6587 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6588 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6590 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
6592 EXPORT_SYMBOL(register_md_personality
);
6593 EXPORT_SYMBOL(unregister_md_personality
);
6594 EXPORT_SYMBOL(md_error
);
6595 EXPORT_SYMBOL(md_done_sync
);
6596 EXPORT_SYMBOL(md_write_start
);
6597 EXPORT_SYMBOL(md_write_end
);
6598 EXPORT_SYMBOL(md_register_thread
);
6599 EXPORT_SYMBOL(md_unregister_thread
);
6600 EXPORT_SYMBOL(md_wakeup_thread
);
6601 EXPORT_SYMBOL(md_check_recovery
);
6602 MODULE_LICENSE("GPL");
6604 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);