2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part
);
72 static LIST_HEAD(pers_list
);
73 static DEFINE_SPINLOCK(pers_lock
);
75 static void md_print_devices(void);
77 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min
= 1000;
93 static int sysctl_speed_limit_max
= 200000;
94 static inline int speed_min(mddev_t
*mddev
)
96 return mddev
->sync_speed_min
?
97 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
100 static inline int speed_max(mddev_t
*mddev
)
102 return mddev
->sync_speed_max
?
103 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
106 static struct ctl_table_header
*raid_table_header
;
108 static ctl_table raid_table
[] = {
110 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
111 .procname
= "speed_limit_min",
112 .data
= &sysctl_speed_limit_min
,
113 .maxlen
= sizeof(int),
114 .mode
= S_IRUGO
|S_IWUSR
,
115 .proc_handler
= &proc_dointvec
,
118 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
119 .procname
= "speed_limit_max",
120 .data
= &sysctl_speed_limit_max
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= &proc_dointvec
,
128 static ctl_table raid_dir_table
[] = {
130 .ctl_name
= DEV_RAID
,
133 .mode
= S_IRUGO
|S_IXUGO
,
139 static ctl_table raid_root_table
[] = {
145 .child
= raid_dir_table
,
150 static struct block_device_operations md_fops
;
152 static int start_readonly
;
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
164 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
165 static atomic_t md_event_count
;
166 void md_new_event(mddev_t
*mddev
)
168 atomic_inc(&md_event_count
);
169 wake_up(&md_event_waiters
);
170 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
172 EXPORT_SYMBOL_GPL(md_new_event
);
174 /* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
177 static void md_new_event_inintr(mddev_t
*mddev
)
179 atomic_inc(&md_event_count
);
180 wake_up(&md_event_waiters
);
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
187 static LIST_HEAD(all_mddevs
);
188 static DEFINE_SPINLOCK(all_mddevs_lock
);
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
198 #define ITERATE_MDDEV(mddev,tmp) \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
214 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
216 bio_io_error(bio
, bio
->bi_size
);
220 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
222 atomic_inc(&mddev
->active
);
226 static void mddev_put(mddev_t
*mddev
)
228 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
230 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
231 list_del(&mddev
->all_mddevs
);
232 spin_unlock(&all_mddevs_lock
);
233 blk_cleanup_queue(mddev
->queue
);
234 kobject_unregister(&mddev
->kobj
);
236 spin_unlock(&all_mddevs_lock
);
239 static mddev_t
* mddev_find(dev_t unit
)
241 mddev_t
*mddev
, *new = NULL
;
244 spin_lock(&all_mddevs_lock
);
245 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
246 if (mddev
->unit
== unit
) {
248 spin_unlock(&all_mddevs_lock
);
254 list_add(&new->all_mddevs
, &all_mddevs
);
255 spin_unlock(&all_mddevs_lock
);
258 spin_unlock(&all_mddevs_lock
);
260 new = kzalloc(sizeof(*new), GFP_KERNEL
);
265 if (MAJOR(unit
) == MD_MAJOR
)
266 new->md_minor
= MINOR(unit
);
268 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
270 mutex_init(&new->reconfig_mutex
);
271 INIT_LIST_HEAD(&new->disks
);
272 INIT_LIST_HEAD(&new->all_mddevs
);
273 init_timer(&new->safemode_timer
);
274 atomic_set(&new->active
, 1);
275 spin_lock_init(&new->write_lock
);
276 init_waitqueue_head(&new->sb_wait
);
277 new->reshape_position
= MaxSector
;
279 new->queue
= blk_alloc_queue(GFP_KERNEL
);
284 set_bit(QUEUE_FLAG_CLUSTER
, &new->queue
->queue_flags
);
286 blk_queue_make_request(new->queue
, md_fail_request
);
291 static inline int mddev_lock(mddev_t
* mddev
)
293 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
296 static inline int mddev_trylock(mddev_t
* mddev
)
298 return mutex_trylock(&mddev
->reconfig_mutex
);
301 static inline void mddev_unlock(mddev_t
* mddev
)
303 mutex_unlock(&mddev
->reconfig_mutex
);
305 md_wakeup_thread(mddev
->thread
);
308 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
311 struct list_head
*tmp
;
313 ITERATE_RDEV(mddev
,rdev
,tmp
) {
314 if (rdev
->desc_nr
== nr
)
320 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
322 struct list_head
*tmp
;
325 ITERATE_RDEV(mddev
,rdev
,tmp
) {
326 if (rdev
->bdev
->bd_dev
== dev
)
332 static struct mdk_personality
*find_pers(int level
, char *clevel
)
334 struct mdk_personality
*pers
;
335 list_for_each_entry(pers
, &pers_list
, list
) {
336 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
338 if (strcmp(pers
->name
, clevel
)==0)
344 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
346 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
347 return MD_NEW_SIZE_BLOCKS(size
);
350 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
354 size
= rdev
->sb_offset
;
357 size
&= ~((sector_t
)chunk_size
/1024 - 1);
361 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
366 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
367 if (!rdev
->sb_page
) {
368 printk(KERN_ALERT
"md: out of memory.\n");
375 static void free_disk_sb(mdk_rdev_t
* rdev
)
378 put_page(rdev
->sb_page
);
380 rdev
->sb_page
= NULL
;
387 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
389 mdk_rdev_t
*rdev
= bio
->bi_private
;
390 mddev_t
*mddev
= rdev
->mddev
;
394 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
395 printk("md: super_written gets error=%d, uptodate=%d\n",
396 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
397 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
398 md_error(mddev
, rdev
);
401 if (atomic_dec_and_test(&mddev
->pending_writes
))
402 wake_up(&mddev
->sb_wait
);
407 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
409 struct bio
*bio2
= bio
->bi_private
;
410 mdk_rdev_t
*rdev
= bio2
->bi_private
;
411 mddev_t
*mddev
= rdev
->mddev
;
415 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
416 error
== -EOPNOTSUPP
) {
418 /* barriers don't appear to be supported :-( */
419 set_bit(BarriersNotsupp
, &rdev
->flags
);
420 mddev
->barriers_work
= 0;
421 spin_lock_irqsave(&mddev
->write_lock
, flags
);
422 bio2
->bi_next
= mddev
->biolist
;
423 mddev
->biolist
= bio2
;
424 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
425 wake_up(&mddev
->sb_wait
);
430 bio
->bi_private
= rdev
;
431 return super_written(bio
, bytes_done
, error
);
434 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
435 sector_t sector
, int size
, struct page
*page
)
437 /* write first size bytes of page to sector of rdev
438 * Increment mddev->pending_writes before returning
439 * and decrement it on completion, waking up sb_wait
440 * if zero is reached.
441 * If an error occurred, call md_error
443 * As we might need to resubmit the request if BIO_RW_BARRIER
444 * causes ENOTSUPP, we allocate a spare bio...
446 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
447 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
449 bio
->bi_bdev
= rdev
->bdev
;
450 bio
->bi_sector
= sector
;
451 bio_add_page(bio
, page
, size
, 0);
452 bio
->bi_private
= rdev
;
453 bio
->bi_end_io
= super_written
;
456 atomic_inc(&mddev
->pending_writes
);
457 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
459 rw
|= (1<<BIO_RW_BARRIER
);
460 rbio
= bio_clone(bio
, GFP_NOIO
);
461 rbio
->bi_private
= bio
;
462 rbio
->bi_end_io
= super_written_barrier
;
463 submit_bio(rw
, rbio
);
468 void md_super_wait(mddev_t
*mddev
)
470 /* wait for all superblock writes that were scheduled to complete.
471 * if any had to be retried (due to BARRIER problems), retry them
475 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
476 if (atomic_read(&mddev
->pending_writes
)==0)
478 while (mddev
->biolist
) {
480 spin_lock_irq(&mddev
->write_lock
);
481 bio
= mddev
->biolist
;
482 mddev
->biolist
= bio
->bi_next
;
484 spin_unlock_irq(&mddev
->write_lock
);
485 submit_bio(bio
->bi_rw
, bio
);
489 finish_wait(&mddev
->sb_wait
, &wq
);
492 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
497 complete((struct completion
*)bio
->bi_private
);
501 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
502 struct page
*page
, int rw
)
504 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
505 struct completion event
;
508 rw
|= (1 << BIO_RW_SYNC
);
511 bio
->bi_sector
= sector
;
512 bio_add_page(bio
, page
, size
, 0);
513 init_completion(&event
);
514 bio
->bi_private
= &event
;
515 bio
->bi_end_io
= bi_complete
;
517 wait_for_completion(&event
);
519 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
523 EXPORT_SYMBOL_GPL(sync_page_io
);
525 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
527 char b
[BDEVNAME_SIZE
];
528 if (!rdev
->sb_page
) {
536 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
542 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
543 bdevname(rdev
->bdev
,b
));
547 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
549 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
550 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
551 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
552 (sb1
->set_uuid3
== sb2
->set_uuid3
))
560 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
563 mdp_super_t
*tmp1
, *tmp2
;
565 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
566 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
568 if (!tmp1
|| !tmp2
) {
570 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
578 * nr_disks is not constant
583 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
595 static u32
md_csum_fold(u32 csum
)
597 csum
= (csum
& 0xffff) + (csum
>> 16);
598 return (csum
& 0xffff) + (csum
>> 16);
601 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
604 u32
*sb32
= (u32
*)sb
;
606 unsigned int disk_csum
, csum
;
608 disk_csum
= sb
->sb_csum
;
611 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
613 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
617 /* This used to use csum_partial, which was wrong for several
618 * reasons including that different results are returned on
619 * different architectures. It isn't critical that we get exactly
620 * the same return value as before (we always csum_fold before
621 * testing, and that removes any differences). However as we
622 * know that csum_partial always returned a 16bit value on
623 * alphas, do a fold to maximise conformity to previous behaviour.
625 sb
->sb_csum
= md_csum_fold(disk_csum
);
627 sb
->sb_csum
= disk_csum
;
634 * Handle superblock details.
635 * We want to be able to handle multiple superblock formats
636 * so we have a common interface to them all, and an array of
637 * different handlers.
638 * We rely on user-space to write the initial superblock, and support
639 * reading and updating of superblocks.
640 * Interface methods are:
641 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
642 * loads and validates a superblock on dev.
643 * if refdev != NULL, compare superblocks on both devices
645 * 0 - dev has a superblock that is compatible with refdev
646 * 1 - dev has a superblock that is compatible and newer than refdev
647 * so dev should be used as the refdev in future
648 * -EINVAL superblock incompatible or invalid
649 * -othererror e.g. -EIO
651 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
652 * Verify that dev is acceptable into mddev.
653 * The first time, mddev->raid_disks will be 0, and data from
654 * dev should be merged in. Subsequent calls check that dev
655 * is new enough. Return 0 or -EINVAL
657 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
658 * Update the superblock for rdev with data in mddev
659 * This does not write to disc.
665 struct module
*owner
;
666 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
667 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
668 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
672 * load_super for 0.90.0
674 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
676 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
682 * Calculate the position of the superblock,
683 * it's at the end of the disk.
685 * It also happens to be a multiple of 4Kb.
687 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
688 rdev
->sb_offset
= sb_offset
;
690 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
695 bdevname(rdev
->bdev
, b
);
696 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
698 if (sb
->md_magic
!= MD_SB_MAGIC
) {
699 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
704 if (sb
->major_version
!= 0 ||
705 sb
->minor_version
< 90 ||
706 sb
->minor_version
> 91) {
707 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
708 sb
->major_version
, sb
->minor_version
,
713 if (sb
->raid_disks
<= 0)
716 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
717 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
722 rdev
->preferred_minor
= sb
->md_minor
;
723 rdev
->data_offset
= 0;
724 rdev
->sb_size
= MD_SB_BYTES
;
726 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
727 if (sb
->level
!= 1 && sb
->level
!= 4
728 && sb
->level
!= 5 && sb
->level
!= 6
729 && sb
->level
!= 10) {
730 /* FIXME use a better test */
732 "md: bitmaps not supported for this level.\n");
737 if (sb
->level
== LEVEL_MULTIPATH
)
740 rdev
->desc_nr
= sb
->this_disk
.number
;
746 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
747 if (!uuid_equal(refsb
, sb
)) {
748 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
749 b
, bdevname(refdev
->bdev
,b2
));
752 if (!sb_equal(refsb
, sb
)) {
753 printk(KERN_WARNING
"md: %s has same UUID"
754 " but different superblock to %s\n",
755 b
, bdevname(refdev
->bdev
, b2
));
759 ev2
= md_event(refsb
);
765 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
767 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
768 /* "this cannot possibly happen" ... */
776 * validate_super for 0.90.0
778 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
781 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
782 __u64 ev1
= md_event(sb
);
784 rdev
->raid_disk
= -1;
786 if (mddev
->raid_disks
== 0) {
787 mddev
->major_version
= 0;
788 mddev
->minor_version
= sb
->minor_version
;
789 mddev
->patch_version
= sb
->patch_version
;
790 mddev
->persistent
= ! sb
->not_persistent
;
791 mddev
->chunk_size
= sb
->chunk_size
;
792 mddev
->ctime
= sb
->ctime
;
793 mddev
->utime
= sb
->utime
;
794 mddev
->level
= sb
->level
;
795 mddev
->clevel
[0] = 0;
796 mddev
->layout
= sb
->layout
;
797 mddev
->raid_disks
= sb
->raid_disks
;
798 mddev
->size
= sb
->size
;
800 mddev
->bitmap_offset
= 0;
801 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
803 if (mddev
->minor_version
>= 91) {
804 mddev
->reshape_position
= sb
->reshape_position
;
805 mddev
->delta_disks
= sb
->delta_disks
;
806 mddev
->new_level
= sb
->new_level
;
807 mddev
->new_layout
= sb
->new_layout
;
808 mddev
->new_chunk
= sb
->new_chunk
;
810 mddev
->reshape_position
= MaxSector
;
811 mddev
->delta_disks
= 0;
812 mddev
->new_level
= mddev
->level
;
813 mddev
->new_layout
= mddev
->layout
;
814 mddev
->new_chunk
= mddev
->chunk_size
;
817 if (sb
->state
& (1<<MD_SB_CLEAN
))
818 mddev
->recovery_cp
= MaxSector
;
820 if (sb
->events_hi
== sb
->cp_events_hi
&&
821 sb
->events_lo
== sb
->cp_events_lo
) {
822 mddev
->recovery_cp
= sb
->recovery_cp
;
824 mddev
->recovery_cp
= 0;
827 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
828 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
829 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
830 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
832 mddev
->max_disks
= MD_SB_DISKS
;
834 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
835 mddev
->bitmap_file
== NULL
)
836 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
838 } else if (mddev
->pers
== NULL
) {
839 /* Insist on good event counter while assembling */
841 if (ev1
< mddev
->events
)
843 } else if (mddev
->bitmap
) {
844 /* if adding to array with a bitmap, then we can accept an
845 * older device ... but not too old.
847 if (ev1
< mddev
->bitmap
->events_cleared
)
850 if (ev1
< mddev
->events
)
851 /* just a hot-add of a new device, leave raid_disk at -1 */
855 if (mddev
->level
!= LEVEL_MULTIPATH
) {
856 desc
= sb
->disks
+ rdev
->desc_nr
;
858 if (desc
->state
& (1<<MD_DISK_FAULTY
))
859 set_bit(Faulty
, &rdev
->flags
);
860 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
861 desc->raid_disk < mddev->raid_disks */) {
862 set_bit(In_sync
, &rdev
->flags
);
863 rdev
->raid_disk
= desc
->raid_disk
;
865 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
866 set_bit(WriteMostly
, &rdev
->flags
);
867 } else /* MULTIPATH are always insync */
868 set_bit(In_sync
, &rdev
->flags
);
873 * sync_super for 0.90.0
875 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
878 struct list_head
*tmp
;
880 int next_spare
= mddev
->raid_disks
;
883 /* make rdev->sb match mddev data..
886 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
887 * 3/ any empty disks < next_spare become removed
889 * disks[0] gets initialised to REMOVED because
890 * we cannot be sure from other fields if it has
891 * been initialised or not.
894 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
896 rdev
->sb_size
= MD_SB_BYTES
;
898 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
900 memset(sb
, 0, sizeof(*sb
));
902 sb
->md_magic
= MD_SB_MAGIC
;
903 sb
->major_version
= mddev
->major_version
;
904 sb
->patch_version
= mddev
->patch_version
;
905 sb
->gvalid_words
= 0; /* ignored */
906 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
907 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
908 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
909 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
911 sb
->ctime
= mddev
->ctime
;
912 sb
->level
= mddev
->level
;
913 sb
->size
= mddev
->size
;
914 sb
->raid_disks
= mddev
->raid_disks
;
915 sb
->md_minor
= mddev
->md_minor
;
916 sb
->not_persistent
= !mddev
->persistent
;
917 sb
->utime
= mddev
->utime
;
919 sb
->events_hi
= (mddev
->events
>>32);
920 sb
->events_lo
= (u32
)mddev
->events
;
922 if (mddev
->reshape_position
== MaxSector
)
923 sb
->minor_version
= 90;
925 sb
->minor_version
= 91;
926 sb
->reshape_position
= mddev
->reshape_position
;
927 sb
->new_level
= mddev
->new_level
;
928 sb
->delta_disks
= mddev
->delta_disks
;
929 sb
->new_layout
= mddev
->new_layout
;
930 sb
->new_chunk
= mddev
->new_chunk
;
932 mddev
->minor_version
= sb
->minor_version
;
935 sb
->recovery_cp
= mddev
->recovery_cp
;
936 sb
->cp_events_hi
= (mddev
->events
>>32);
937 sb
->cp_events_lo
= (u32
)mddev
->events
;
938 if (mddev
->recovery_cp
== MaxSector
)
939 sb
->state
= (1<< MD_SB_CLEAN
);
943 sb
->layout
= mddev
->layout
;
944 sb
->chunk_size
= mddev
->chunk_size
;
946 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
947 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
949 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
950 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
953 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
954 && !test_bit(Faulty
, &rdev2
->flags
))
955 desc_nr
= rdev2
->raid_disk
;
957 desc_nr
= next_spare
++;
958 rdev2
->desc_nr
= desc_nr
;
959 d
= &sb
->disks
[rdev2
->desc_nr
];
961 d
->number
= rdev2
->desc_nr
;
962 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
963 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
964 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
965 && !test_bit(Faulty
, &rdev2
->flags
))
966 d
->raid_disk
= rdev2
->raid_disk
;
968 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
969 if (test_bit(Faulty
, &rdev2
->flags
))
970 d
->state
= (1<<MD_DISK_FAULTY
);
971 else if (test_bit(In_sync
, &rdev2
->flags
)) {
972 d
->state
= (1<<MD_DISK_ACTIVE
);
973 d
->state
|= (1<<MD_DISK_SYNC
);
981 if (test_bit(WriteMostly
, &rdev2
->flags
))
982 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
984 /* now set the "removed" and "faulty" bits on any missing devices */
985 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
986 mdp_disk_t
*d
= &sb
->disks
[i
];
987 if (d
->state
== 0 && d
->number
== 0) {
990 d
->state
= (1<<MD_DISK_REMOVED
);
991 d
->state
|= (1<<MD_DISK_FAULTY
);
995 sb
->nr_disks
= nr_disks
;
996 sb
->active_disks
= active
;
997 sb
->working_disks
= working
;
998 sb
->failed_disks
= failed
;
999 sb
->spare_disks
= spare
;
1001 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1002 sb
->sb_csum
= calc_sb_csum(sb
);
1006 * version 1 superblock
1009 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1013 unsigned long long newcsum
;
1014 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1015 __le32
*isuper
= (__le32
*)sb
;
1018 disk_csum
= sb
->sb_csum
;
1021 for (i
=0; size
>=4; size
-= 4 )
1022 newcsum
+= le32_to_cpu(*isuper
++);
1025 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1027 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1028 sb
->sb_csum
= disk_csum
;
1029 return cpu_to_le32(csum
);
1032 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1034 struct mdp_superblock_1
*sb
;
1037 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1041 * Calculate the position of the superblock.
1042 * It is always aligned to a 4K boundary and
1043 * depeding on minor_version, it can be:
1044 * 0: At least 8K, but less than 12K, from end of device
1045 * 1: At start of device
1046 * 2: 4K from start of device.
1048 switch(minor_version
) {
1050 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1052 sb_offset
&= ~(sector_t
)(4*2-1);
1053 /* convert from sectors to K */
1065 rdev
->sb_offset
= sb_offset
;
1067 /* superblock is rarely larger than 1K, but it can be larger,
1068 * and it is safe to read 4k, so we do that
1070 ret
= read_disk_sb(rdev
, 4096);
1071 if (ret
) return ret
;
1074 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1076 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1077 sb
->major_version
!= cpu_to_le32(1) ||
1078 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1079 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1080 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1083 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1084 printk("md: invalid superblock checksum on %s\n",
1085 bdevname(rdev
->bdev
,b
));
1088 if (le64_to_cpu(sb
->data_size
) < 10) {
1089 printk("md: data_size too small on %s\n",
1090 bdevname(rdev
->bdev
,b
));
1093 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1094 if (sb
->level
!= cpu_to_le32(1) &&
1095 sb
->level
!= cpu_to_le32(4) &&
1096 sb
->level
!= cpu_to_le32(5) &&
1097 sb
->level
!= cpu_to_le32(6) &&
1098 sb
->level
!= cpu_to_le32(10)) {
1100 "md: bitmaps not supported for this level.\n");
1105 rdev
->preferred_minor
= 0xffff;
1106 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1107 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1109 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1110 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1111 if (rdev
->sb_size
& bmask
)
1112 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1114 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1117 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1123 struct mdp_superblock_1
*refsb
=
1124 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1126 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1127 sb
->level
!= refsb
->level
||
1128 sb
->layout
!= refsb
->layout
||
1129 sb
->chunksize
!= refsb
->chunksize
) {
1130 printk(KERN_WARNING
"md: %s has strangely different"
1131 " superblock to %s\n",
1132 bdevname(rdev
->bdev
,b
),
1133 bdevname(refdev
->bdev
,b2
));
1136 ev1
= le64_to_cpu(sb
->events
);
1137 ev2
= le64_to_cpu(refsb
->events
);
1145 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1147 rdev
->size
= rdev
->sb_offset
;
1148 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1150 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1151 if (le32_to_cpu(sb
->chunksize
))
1152 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1154 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1159 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1161 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1162 __u64 ev1
= le64_to_cpu(sb
->events
);
1164 rdev
->raid_disk
= -1;
1166 if (mddev
->raid_disks
== 0) {
1167 mddev
->major_version
= 1;
1168 mddev
->patch_version
= 0;
1169 mddev
->persistent
= 1;
1170 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1171 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1172 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1173 mddev
->level
= le32_to_cpu(sb
->level
);
1174 mddev
->clevel
[0] = 0;
1175 mddev
->layout
= le32_to_cpu(sb
->layout
);
1176 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1177 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1178 mddev
->events
= ev1
;
1179 mddev
->bitmap_offset
= 0;
1180 mddev
->default_bitmap_offset
= 1024 >> 9;
1182 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1183 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1185 mddev
->max_disks
= (4096-256)/2;
1187 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1188 mddev
->bitmap_file
== NULL
)
1189 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1191 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1192 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1193 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1194 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1195 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1196 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1198 mddev
->reshape_position
= MaxSector
;
1199 mddev
->delta_disks
= 0;
1200 mddev
->new_level
= mddev
->level
;
1201 mddev
->new_layout
= mddev
->layout
;
1202 mddev
->new_chunk
= mddev
->chunk_size
;
1205 } else if (mddev
->pers
== NULL
) {
1206 /* Insist of good event counter while assembling */
1208 if (ev1
< mddev
->events
)
1210 } else if (mddev
->bitmap
) {
1211 /* If adding to array with a bitmap, then we can accept an
1212 * older device, but not too old.
1214 if (ev1
< mddev
->bitmap
->events_cleared
)
1217 if (ev1
< mddev
->events
)
1218 /* just a hot-add of a new device, leave raid_disk at -1 */
1221 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1223 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1225 case 0xffff: /* spare */
1227 case 0xfffe: /* faulty */
1228 set_bit(Faulty
, &rdev
->flags
);
1231 if ((le32_to_cpu(sb
->feature_map
) &
1232 MD_FEATURE_RECOVERY_OFFSET
))
1233 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1235 set_bit(In_sync
, &rdev
->flags
);
1236 rdev
->raid_disk
= role
;
1239 if (sb
->devflags
& WriteMostly1
)
1240 set_bit(WriteMostly
, &rdev
->flags
);
1241 } else /* MULTIPATH are always insync */
1242 set_bit(In_sync
, &rdev
->flags
);
1247 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1249 struct mdp_superblock_1
*sb
;
1250 struct list_head
*tmp
;
1253 /* make rdev->sb match mddev and rdev data. */
1255 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1257 sb
->feature_map
= 0;
1259 sb
->recovery_offset
= cpu_to_le64(0);
1260 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1261 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1262 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1264 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1265 sb
->events
= cpu_to_le64(mddev
->events
);
1267 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1269 sb
->resync_offset
= cpu_to_le64(0);
1271 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1273 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1274 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1276 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1277 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1278 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1281 if (rdev
->raid_disk
>= 0 &&
1282 !test_bit(In_sync
, &rdev
->flags
) &&
1283 rdev
->recovery_offset
> 0) {
1284 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1285 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1288 if (mddev
->reshape_position
!= MaxSector
) {
1289 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1290 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1291 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1292 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1293 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1294 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1298 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1299 if (rdev2
->desc_nr
+1 > max_dev
)
1300 max_dev
= rdev2
->desc_nr
+1;
1302 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1303 sb
->max_dev
= cpu_to_le32(max_dev
);
1304 for (i
=0; i
<max_dev
;i
++)
1305 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1307 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1309 if (test_bit(Faulty
, &rdev2
->flags
))
1310 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1311 else if (test_bit(In_sync
, &rdev2
->flags
))
1312 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1313 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1314 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1316 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1319 sb
->sb_csum
= calc_sb_1_csum(sb
);
1323 static struct super_type super_types
[] = {
1326 .owner
= THIS_MODULE
,
1327 .load_super
= super_90_load
,
1328 .validate_super
= super_90_validate
,
1329 .sync_super
= super_90_sync
,
1333 .owner
= THIS_MODULE
,
1334 .load_super
= super_1_load
,
1335 .validate_super
= super_1_validate
,
1336 .sync_super
= super_1_sync
,
1340 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1342 struct list_head
*tmp
, *tmp2
;
1343 mdk_rdev_t
*rdev
, *rdev2
;
1345 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1346 ITERATE_RDEV(mddev2
, rdev2
, tmp2
)
1347 if (rdev
->bdev
->bd_contains
==
1348 rdev2
->bdev
->bd_contains
)
1354 static LIST_HEAD(pending_raid_disks
);
1356 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1358 char b
[BDEVNAME_SIZE
];
1367 /* make sure rdev->size exceeds mddev->size */
1368 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1370 /* Cannot change size, so fail
1371 * If mddev->level <= 0, then we don't care
1372 * about aligning sizes (e.g. linear)
1374 if (mddev
->level
> 0)
1377 mddev
->size
= rdev
->size
;
1380 /* Verify rdev->desc_nr is unique.
1381 * If it is -1, assign a free number, else
1382 * check number is not in use
1384 if (rdev
->desc_nr
< 0) {
1386 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1387 while (find_rdev_nr(mddev
, choice
))
1389 rdev
->desc_nr
= choice
;
1391 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1394 bdevname(rdev
->bdev
,b
);
1395 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1397 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1400 rdev
->mddev
= mddev
;
1401 printk(KERN_INFO
"md: bind<%s>\n", b
);
1403 rdev
->kobj
.parent
= &mddev
->kobj
;
1404 if ((err
= kobject_add(&rdev
->kobj
)))
1407 if (rdev
->bdev
->bd_part
)
1408 ko
= &rdev
->bdev
->bd_part
->kobj
;
1410 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1411 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1412 kobject_del(&rdev
->kobj
);
1415 list_add(&rdev
->same_set
, &mddev
->disks
);
1416 bd_claim_by_disk(rdev
->bdev
, rdev
, mddev
->gendisk
);
1420 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1425 static void delayed_delete(struct work_struct
*ws
)
1427 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1428 kobject_del(&rdev
->kobj
);
1431 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1433 char b
[BDEVNAME_SIZE
];
1438 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1439 list_del_init(&rdev
->same_set
);
1440 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1442 sysfs_remove_link(&rdev
->kobj
, "block");
1444 /* We need to delay this, otherwise we can deadlock when
1445 * writing to 'remove' to "dev/state"
1447 INIT_WORK(&rdev
->del_work
, delayed_delete
);
1448 schedule_work(&rdev
->del_work
);
1452 * prevent the device from being mounted, repartitioned or
1453 * otherwise reused by a RAID array (or any other kernel
1454 * subsystem), by bd_claiming the device.
1456 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1459 struct block_device
*bdev
;
1460 char b
[BDEVNAME_SIZE
];
1462 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1464 printk(KERN_ERR
"md: could not open %s.\n",
1465 __bdevname(dev
, b
));
1466 return PTR_ERR(bdev
);
1468 err
= bd_claim(bdev
, rdev
);
1470 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1479 static void unlock_rdev(mdk_rdev_t
*rdev
)
1481 struct block_device
*bdev
= rdev
->bdev
;
1489 void md_autodetect_dev(dev_t dev
);
1491 static void export_rdev(mdk_rdev_t
* rdev
)
1493 char b
[BDEVNAME_SIZE
];
1494 printk(KERN_INFO
"md: export_rdev(%s)\n",
1495 bdevname(rdev
->bdev
,b
));
1499 list_del_init(&rdev
->same_set
);
1501 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1504 kobject_put(&rdev
->kobj
);
1507 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1509 unbind_rdev_from_array(rdev
);
1513 static void export_array(mddev_t
*mddev
)
1515 struct list_head
*tmp
;
1518 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1523 kick_rdev_from_array(rdev
);
1525 if (!list_empty(&mddev
->disks
))
1527 mddev
->raid_disks
= 0;
1528 mddev
->major_version
= 0;
1531 static void print_desc(mdp_disk_t
*desc
)
1533 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1534 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1537 static void print_sb(mdp_super_t
*sb
)
1542 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1543 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1544 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1546 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1547 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1548 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1549 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1550 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1551 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1552 sb
->failed_disks
, sb
->spare_disks
,
1553 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1556 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1559 desc
= sb
->disks
+ i
;
1560 if (desc
->number
|| desc
->major
|| desc
->minor
||
1561 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1562 printk(" D %2d: ", i
);
1566 printk(KERN_INFO
"md: THIS: ");
1567 print_desc(&sb
->this_disk
);
1571 static void print_rdev(mdk_rdev_t
*rdev
)
1573 char b
[BDEVNAME_SIZE
];
1574 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1575 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1576 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1578 if (rdev
->sb_loaded
) {
1579 printk(KERN_INFO
"md: rdev superblock:\n");
1580 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1582 printk(KERN_INFO
"md: no rdev superblock!\n");
1585 static void md_print_devices(void)
1587 struct list_head
*tmp
, *tmp2
;
1590 char b
[BDEVNAME_SIZE
];
1593 printk("md: **********************************\n");
1594 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1595 printk("md: **********************************\n");
1596 ITERATE_MDDEV(mddev
,tmp
) {
1599 bitmap_print_sb(mddev
->bitmap
);
1601 printk("%s: ", mdname(mddev
));
1602 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1603 printk("<%s>", bdevname(rdev
->bdev
,b
));
1606 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1609 printk("md: **********************************\n");
1614 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1616 /* Update each superblock (in-memory image), but
1617 * if we are allowed to, skip spares which already
1618 * have the right event counter, or have one earlier
1619 * (which would mean they aren't being marked as dirty
1620 * with the rest of the array)
1623 struct list_head
*tmp
;
1625 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1626 if (rdev
->sb_events
== mddev
->events
||
1628 rdev
->raid_disk
< 0 &&
1629 (rdev
->sb_events
&1)==0 &&
1630 rdev
->sb_events
+1 == mddev
->events
)) {
1631 /* Don't update this superblock */
1632 rdev
->sb_loaded
= 2;
1634 super_types
[mddev
->major_version
].
1635 sync_super(mddev
, rdev
);
1636 rdev
->sb_loaded
= 1;
1641 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1644 struct list_head
*tmp
;
1650 spin_lock_irq(&mddev
->write_lock
);
1652 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1653 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1655 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1656 /* just a clean<-> dirty transition, possibly leave spares alone,
1657 * though if events isn't the right even/odd, we will have to do
1663 if (mddev
->degraded
)
1664 /* If the array is degraded, then skipping spares is both
1665 * dangerous and fairly pointless.
1666 * Dangerous because a device that was removed from the array
1667 * might have a event_count that still looks up-to-date,
1668 * so it can be re-added without a resync.
1669 * Pointless because if there are any spares to skip,
1670 * then a recovery will happen and soon that array won't
1671 * be degraded any more and the spare can go back to sleep then.
1675 sync_req
= mddev
->in_sync
;
1676 mddev
->utime
= get_seconds();
1678 /* If this is just a dirty<->clean transition, and the array is clean
1679 * and 'events' is odd, we can roll back to the previous clean state */
1681 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1682 && (mddev
->events
& 1)
1683 && mddev
->events
!= 1)
1686 /* otherwise we have to go forward and ... */
1688 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1689 /* .. if the array isn't clean, insist on an odd 'events' */
1690 if ((mddev
->events
&1)==0) {
1695 /* otherwise insist on an even 'events' (for clean states) */
1696 if ((mddev
->events
&1)) {
1703 if (!mddev
->events
) {
1705 * oops, this 64-bit counter should never wrap.
1706 * Either we are in around ~1 trillion A.C., assuming
1707 * 1 reboot per second, or we have a bug:
1712 sync_sbs(mddev
, nospares
);
1715 * do not write anything to disk if using
1716 * nonpersistent superblocks
1718 if (!mddev
->persistent
) {
1719 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1720 spin_unlock_irq(&mddev
->write_lock
);
1721 wake_up(&mddev
->sb_wait
);
1724 spin_unlock_irq(&mddev
->write_lock
);
1727 "md: updating %s RAID superblock on device (in sync %d)\n",
1728 mdname(mddev
),mddev
->in_sync
);
1730 err
= bitmap_update_sb(mddev
->bitmap
);
1731 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1732 char b
[BDEVNAME_SIZE
];
1733 dprintk(KERN_INFO
"md: ");
1734 if (rdev
->sb_loaded
!= 1)
1735 continue; /* no noise on spare devices */
1736 if (test_bit(Faulty
, &rdev
->flags
))
1737 dprintk("(skipping faulty ");
1739 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1740 if (!test_bit(Faulty
, &rdev
->flags
)) {
1741 md_super_write(mddev
,rdev
,
1742 rdev
->sb_offset
<<1, rdev
->sb_size
,
1744 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1745 bdevname(rdev
->bdev
,b
),
1746 (unsigned long long)rdev
->sb_offset
);
1747 rdev
->sb_events
= mddev
->events
;
1751 if (mddev
->level
== LEVEL_MULTIPATH
)
1752 /* only need to write one superblock... */
1755 md_super_wait(mddev
);
1756 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1758 spin_lock_irq(&mddev
->write_lock
);
1759 if (mddev
->in_sync
!= sync_req
||
1760 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1761 /* have to write it out again */
1762 spin_unlock_irq(&mddev
->write_lock
);
1765 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1766 spin_unlock_irq(&mddev
->write_lock
);
1767 wake_up(&mddev
->sb_wait
);
1771 /* words written to sysfs files may, or my not, be \n terminated.
1772 * We want to accept with case. For this we use cmd_match.
1774 static int cmd_match(const char *cmd
, const char *str
)
1776 /* See if cmd, written into a sysfs file, matches
1777 * str. They must either be the same, or cmd can
1778 * have a trailing newline
1780 while (*cmd
&& *str
&& *cmd
== *str
) {
1791 struct rdev_sysfs_entry
{
1792 struct attribute attr
;
1793 ssize_t (*show
)(mdk_rdev_t
*, char *);
1794 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1798 state_show(mdk_rdev_t
*rdev
, char *page
)
1803 if (test_bit(Faulty
, &rdev
->flags
)) {
1804 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1807 if (test_bit(In_sync
, &rdev
->flags
)) {
1808 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1811 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1812 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1815 if (!test_bit(Faulty
, &rdev
->flags
) &&
1816 !test_bit(In_sync
, &rdev
->flags
)) {
1817 len
+= sprintf(page
+len
, "%sspare", sep
);
1820 return len
+sprintf(page
+len
, "\n");
1824 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1827 * faulty - simulates and error
1828 * remove - disconnects the device
1829 * writemostly - sets write_mostly
1830 * -writemostly - clears write_mostly
1833 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1834 md_error(rdev
->mddev
, rdev
);
1836 } else if (cmd_match(buf
, "remove")) {
1837 if (rdev
->raid_disk
>= 0)
1840 mddev_t
*mddev
= rdev
->mddev
;
1841 kick_rdev_from_array(rdev
);
1843 md_update_sb(mddev
, 1);
1844 md_new_event(mddev
);
1847 } else if (cmd_match(buf
, "writemostly")) {
1848 set_bit(WriteMostly
, &rdev
->flags
);
1850 } else if (cmd_match(buf
, "-writemostly")) {
1851 clear_bit(WriteMostly
, &rdev
->flags
);
1854 return err
? err
: len
;
1856 static struct rdev_sysfs_entry rdev_state
=
1857 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1860 super_show(mdk_rdev_t
*rdev
, char *page
)
1862 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1863 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1864 return rdev
->sb_size
;
1868 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1871 errors_show(mdk_rdev_t
*rdev
, char *page
)
1873 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1877 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1880 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1881 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1882 atomic_set(&rdev
->corrected_errors
, n
);
1887 static struct rdev_sysfs_entry rdev_errors
=
1888 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1891 slot_show(mdk_rdev_t
*rdev
, char *page
)
1893 if (rdev
->raid_disk
< 0)
1894 return sprintf(page
, "none\n");
1896 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1900 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1903 int slot
= simple_strtoul(buf
, &e
, 10);
1904 if (strncmp(buf
, "none", 4)==0)
1906 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1908 if (rdev
->mddev
->pers
)
1909 /* Cannot set slot in active array (yet) */
1911 if (slot
>= rdev
->mddev
->raid_disks
)
1913 rdev
->raid_disk
= slot
;
1914 /* assume it is working */
1916 set_bit(In_sync
, &rdev
->flags
);
1921 static struct rdev_sysfs_entry rdev_slot
=
1922 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
1925 offset_show(mdk_rdev_t
*rdev
, char *page
)
1927 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1931 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1934 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1935 if (e
==buf
|| (*e
&& *e
!= '\n'))
1937 if (rdev
->mddev
->pers
)
1939 rdev
->data_offset
= offset
;
1943 static struct rdev_sysfs_entry rdev_offset
=
1944 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
1947 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1949 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1953 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1956 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1957 if (e
==buf
|| (*e
&& *e
!= '\n'))
1959 if (rdev
->mddev
->pers
)
1962 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1963 rdev
->mddev
->size
= size
;
1967 static struct rdev_sysfs_entry rdev_size
=
1968 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
1970 static struct attribute
*rdev_default_attrs
[] = {
1980 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1982 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1983 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1987 return entry
->show(rdev
, page
);
1991 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1992 const char *page
, size_t length
)
1994 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1995 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1999 if (!capable(CAP_SYS_ADMIN
))
2001 return entry
->store(rdev
, page
, length
);
2004 static void rdev_free(struct kobject
*ko
)
2006 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2009 static struct sysfs_ops rdev_sysfs_ops
= {
2010 .show
= rdev_attr_show
,
2011 .store
= rdev_attr_store
,
2013 static struct kobj_type rdev_ktype
= {
2014 .release
= rdev_free
,
2015 .sysfs_ops
= &rdev_sysfs_ops
,
2016 .default_attrs
= rdev_default_attrs
,
2020 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2022 * mark the device faulty if:
2024 * - the device is nonexistent (zero size)
2025 * - the device has no valid superblock
2027 * a faulty rdev _never_ has rdev->sb set.
2029 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2031 char b
[BDEVNAME_SIZE
];
2036 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2038 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2039 return ERR_PTR(-ENOMEM
);
2042 if ((err
= alloc_disk_sb(rdev
)))
2045 err
= lock_rdev(rdev
, newdev
);
2049 rdev
->kobj
.parent
= NULL
;
2050 rdev
->kobj
.ktype
= &rdev_ktype
;
2051 kobject_init(&rdev
->kobj
);
2054 rdev
->saved_raid_disk
= -1;
2055 rdev
->raid_disk
= -1;
2057 rdev
->data_offset
= 0;
2058 rdev
->sb_events
= 0;
2059 atomic_set(&rdev
->nr_pending
, 0);
2060 atomic_set(&rdev
->read_errors
, 0);
2061 atomic_set(&rdev
->corrected_errors
, 0);
2063 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2066 "md: %s has zero or unknown size, marking faulty!\n",
2067 bdevname(rdev
->bdev
,b
));
2072 if (super_format
>= 0) {
2073 err
= super_types
[super_format
].
2074 load_super(rdev
, NULL
, super_minor
);
2075 if (err
== -EINVAL
) {
2077 "md: %s does not have a valid v%d.%d "
2078 "superblock, not importing!\n",
2079 bdevname(rdev
->bdev
,b
),
2080 super_format
, super_minor
);
2085 "md: could not read %s's sb, not importing!\n",
2086 bdevname(rdev
->bdev
,b
));
2090 INIT_LIST_HEAD(&rdev
->same_set
);
2095 if (rdev
->sb_page
) {
2101 return ERR_PTR(err
);
2105 * Check a full RAID array for plausibility
2109 static void analyze_sbs(mddev_t
* mddev
)
2112 struct list_head
*tmp
;
2113 mdk_rdev_t
*rdev
, *freshest
;
2114 char b
[BDEVNAME_SIZE
];
2117 ITERATE_RDEV(mddev
,rdev
,tmp
)
2118 switch (super_types
[mddev
->major_version
].
2119 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2127 "md: fatal superblock inconsistency in %s"
2128 " -- removing from array\n",
2129 bdevname(rdev
->bdev
,b
));
2130 kick_rdev_from_array(rdev
);
2134 super_types
[mddev
->major_version
].
2135 validate_super(mddev
, freshest
);
2138 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2139 if (rdev
!= freshest
)
2140 if (super_types
[mddev
->major_version
].
2141 validate_super(mddev
, rdev
)) {
2142 printk(KERN_WARNING
"md: kicking non-fresh %s"
2144 bdevname(rdev
->bdev
,b
));
2145 kick_rdev_from_array(rdev
);
2148 if (mddev
->level
== LEVEL_MULTIPATH
) {
2149 rdev
->desc_nr
= i
++;
2150 rdev
->raid_disk
= rdev
->desc_nr
;
2151 set_bit(In_sync
, &rdev
->flags
);
2152 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2153 rdev
->raid_disk
= -1;
2154 clear_bit(In_sync
, &rdev
->flags
);
2160 if (mddev
->recovery_cp
!= MaxSector
&&
2162 printk(KERN_ERR
"md: %s: raid array is not clean"
2163 " -- starting background reconstruction\n",
2169 safe_delay_show(mddev_t
*mddev
, char *page
)
2171 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2172 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2175 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2183 /* remove a period, and count digits after it */
2184 if (len
>= sizeof(buf
))
2186 strlcpy(buf
, cbuf
, len
);
2188 for (i
=0; i
<len
; i
++) {
2190 if (isdigit(buf
[i
])) {
2195 } else if (buf
[i
] == '.') {
2200 msec
= simple_strtoul(buf
, &e
, 10);
2201 if (e
== buf
|| (*e
&& *e
!= '\n'))
2203 msec
= (msec
* 1000) / scale
;
2205 mddev
->safemode_delay
= 0;
2207 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2208 if (mddev
->safemode_delay
== 0)
2209 mddev
->safemode_delay
= 1;
2213 static struct md_sysfs_entry md_safe_delay
=
2214 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2217 level_show(mddev_t
*mddev
, char *page
)
2219 struct mdk_personality
*p
= mddev
->pers
;
2221 return sprintf(page
, "%s\n", p
->name
);
2222 else if (mddev
->clevel
[0])
2223 return sprintf(page
, "%s\n", mddev
->clevel
);
2224 else if (mddev
->level
!= LEVEL_NONE
)
2225 return sprintf(page
, "%d\n", mddev
->level
);
2231 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2238 if (len
>= sizeof(mddev
->clevel
))
2240 strncpy(mddev
->clevel
, buf
, len
);
2241 if (mddev
->clevel
[len
-1] == '\n')
2243 mddev
->clevel
[len
] = 0;
2244 mddev
->level
= LEVEL_NONE
;
2248 static struct md_sysfs_entry md_level
=
2249 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2253 layout_show(mddev_t
*mddev
, char *page
)
2255 /* just a number, not meaningful for all levels */
2256 if (mddev
->reshape_position
!= MaxSector
&&
2257 mddev
->layout
!= mddev
->new_layout
)
2258 return sprintf(page
, "%d (%d)\n",
2259 mddev
->new_layout
, mddev
->layout
);
2260 return sprintf(page
, "%d\n", mddev
->layout
);
2264 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2267 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2269 if (!*buf
|| (*e
&& *e
!= '\n'))
2274 if (mddev
->reshape_position
!= MaxSector
)
2275 mddev
->new_layout
= n
;
2280 static struct md_sysfs_entry md_layout
=
2281 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2285 raid_disks_show(mddev_t
*mddev
, char *page
)
2287 if (mddev
->raid_disks
== 0)
2289 if (mddev
->reshape_position
!= MaxSector
&&
2290 mddev
->delta_disks
!= 0)
2291 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2292 mddev
->raid_disks
- mddev
->delta_disks
);
2293 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2296 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2299 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2303 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2305 if (!*buf
|| (*e
&& *e
!= '\n'))
2309 rv
= update_raid_disks(mddev
, n
);
2310 else if (mddev
->reshape_position
!= MaxSector
) {
2311 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2312 mddev
->delta_disks
= n
- olddisks
;
2313 mddev
->raid_disks
= n
;
2315 mddev
->raid_disks
= n
;
2316 return rv
? rv
: len
;
2318 static struct md_sysfs_entry md_raid_disks
=
2319 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2322 chunk_size_show(mddev_t
*mddev
, char *page
)
2324 if (mddev
->reshape_position
!= MaxSector
&&
2325 mddev
->chunk_size
!= mddev
->new_chunk
)
2326 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2328 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2332 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2334 /* can only set chunk_size if array is not yet active */
2336 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2338 if (!*buf
|| (*e
&& *e
!= '\n'))
2343 else if (mddev
->reshape_position
!= MaxSector
)
2344 mddev
->new_chunk
= n
;
2346 mddev
->chunk_size
= n
;
2349 static struct md_sysfs_entry md_chunk_size
=
2350 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2353 resync_start_show(mddev_t
*mddev
, char *page
)
2355 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2359 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2361 /* can only set chunk_size if array is not yet active */
2363 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2367 if (!*buf
|| (*e
&& *e
!= '\n'))
2370 mddev
->recovery_cp
= n
;
2373 static struct md_sysfs_entry md_resync_start
=
2374 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2377 * The array state can be:
2380 * No devices, no size, no level
2381 * Equivalent to STOP_ARRAY ioctl
2383 * May have some settings, but array is not active
2384 * all IO results in error
2385 * When written, doesn't tear down array, but just stops it
2386 * suspended (not supported yet)
2387 * All IO requests will block. The array can be reconfigured.
2388 * Writing this, if accepted, will block until array is quiessent
2390 * no resync can happen. no superblocks get written.
2391 * write requests fail
2393 * like readonly, but behaves like 'clean' on a write request.
2395 * clean - no pending writes, but otherwise active.
2396 * When written to inactive array, starts without resync
2397 * If a write request arrives then
2398 * if metadata is known, mark 'dirty' and switch to 'active'.
2399 * if not known, block and switch to write-pending
2400 * If written to an active array that has pending writes, then fails.
2402 * fully active: IO and resync can be happening.
2403 * When written to inactive array, starts with resync
2406 * clean, but writes are blocked waiting for 'active' to be written.
2409 * like active, but no writes have been seen for a while (100msec).
2412 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2413 write_pending
, active_idle
, bad_word
};
2414 static char *array_states
[] = {
2415 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2416 "write-pending", "active-idle", NULL
};
2418 static int match_word(const char *word
, char **list
)
2421 for (n
=0; list
[n
]; n
++)
2422 if (cmd_match(word
, list
[n
]))
2428 array_state_show(mddev_t
*mddev
, char *page
)
2430 enum array_state st
= inactive
;
2443 else if (mddev
->safemode
)
2449 if (list_empty(&mddev
->disks
) &&
2450 mddev
->raid_disks
== 0 &&
2456 return sprintf(page
, "%s\n", array_states
[st
]);
2459 static int do_md_stop(mddev_t
* mddev
, int ro
);
2460 static int do_md_run(mddev_t
* mddev
);
2461 static int restart_array(mddev_t
*mddev
);
2464 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2467 enum array_state st
= match_word(buf
, array_states
);
2472 /* stopping an active array */
2474 if (atomic_read(&mddev
->active
) > 1)
2476 err
= do_md_stop(mddev
, 0);
2480 /* stopping an active array */
2482 if (atomic_read(&mddev
->active
) > 1)
2484 err
= do_md_stop(mddev
, 2);
2488 break; /* not supported yet */
2491 err
= do_md_stop(mddev
, 1);
2494 err
= do_md_run(mddev
);
2498 /* stopping an active array */
2500 err
= do_md_stop(mddev
, 1);
2502 mddev
->ro
= 2; /* FIXME mark devices writable */
2505 err
= do_md_run(mddev
);
2510 restart_array(mddev
);
2511 spin_lock_irq(&mddev
->write_lock
);
2512 if (atomic_read(&mddev
->writes_pending
) == 0) {
2514 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2516 spin_unlock_irq(&mddev
->write_lock
);
2519 mddev
->recovery_cp
= MaxSector
;
2520 err
= do_md_run(mddev
);
2525 restart_array(mddev
);
2526 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2527 wake_up(&mddev
->sb_wait
);
2531 err
= do_md_run(mddev
);
2536 /* these cannot be set */
2544 static struct md_sysfs_entry md_array_state
=
2545 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2548 null_show(mddev_t
*mddev
, char *page
)
2554 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2556 /* buf must be %d:%d\n? giving major and minor numbers */
2557 /* The new device is added to the array.
2558 * If the array has a persistent superblock, we read the
2559 * superblock to initialise info and check validity.
2560 * Otherwise, only checking done is that in bind_rdev_to_array,
2561 * which mainly checks size.
2564 int major
= simple_strtoul(buf
, &e
, 10);
2570 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2572 minor
= simple_strtoul(e
+1, &e
, 10);
2573 if (*e
&& *e
!= '\n')
2575 dev
= MKDEV(major
, minor
);
2576 if (major
!= MAJOR(dev
) ||
2577 minor
!= MINOR(dev
))
2581 if (mddev
->persistent
) {
2582 rdev
= md_import_device(dev
, mddev
->major_version
,
2583 mddev
->minor_version
);
2584 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2585 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2586 mdk_rdev_t
, same_set
);
2587 err
= super_types
[mddev
->major_version
]
2588 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2593 rdev
= md_import_device(dev
, -1, -1);
2596 return PTR_ERR(rdev
);
2597 err
= bind_rdev_to_array(rdev
, mddev
);
2601 return err
? err
: len
;
2604 static struct md_sysfs_entry md_new_device
=
2605 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2608 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2611 unsigned long chunk
, end_chunk
;
2615 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2617 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2618 if (buf
== end
) break;
2619 if (*end
== '-') { /* range */
2621 end_chunk
= simple_strtoul(buf
, &end
, 0);
2622 if (buf
== end
) break;
2624 if (*end
&& !isspace(*end
)) break;
2625 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2627 while (isspace(*buf
)) buf
++;
2629 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2634 static struct md_sysfs_entry md_bitmap
=
2635 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2638 size_show(mddev_t
*mddev
, char *page
)
2640 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2643 static int update_size(mddev_t
*mddev
, unsigned long size
);
2646 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2648 /* If array is inactive, we can reduce the component size, but
2649 * not increase it (except from 0).
2650 * If array is active, we can try an on-line resize
2654 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2655 if (!*buf
|| *buf
== '\n' ||
2660 err
= update_size(mddev
, size
);
2661 md_update_sb(mddev
, 1);
2663 if (mddev
->size
== 0 ||
2669 return err
? err
: len
;
2672 static struct md_sysfs_entry md_size
=
2673 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2677 * This is either 'none' for arrays with externally managed metadata,
2678 * or N.M for internally known formats
2681 metadata_show(mddev_t
*mddev
, char *page
)
2683 if (mddev
->persistent
)
2684 return sprintf(page
, "%d.%d\n",
2685 mddev
->major_version
, mddev
->minor_version
);
2687 return sprintf(page
, "none\n");
2691 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2695 if (!list_empty(&mddev
->disks
))
2698 if (cmd_match(buf
, "none")) {
2699 mddev
->persistent
= 0;
2700 mddev
->major_version
= 0;
2701 mddev
->minor_version
= 90;
2704 major
= simple_strtoul(buf
, &e
, 10);
2705 if (e
==buf
|| *e
!= '.')
2708 minor
= simple_strtoul(buf
, &e
, 10);
2709 if (e
==buf
|| (*e
&& *e
!= '\n') )
2711 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2713 mddev
->major_version
= major
;
2714 mddev
->minor_version
= minor
;
2715 mddev
->persistent
= 1;
2719 static struct md_sysfs_entry md_metadata
=
2720 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2723 action_show(mddev_t
*mddev
, char *page
)
2725 char *type
= "idle";
2726 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2727 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2728 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2730 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2731 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2733 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2740 return sprintf(page
, "%s\n", type
);
2744 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2746 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2749 if (cmd_match(page
, "idle")) {
2750 if (mddev
->sync_thread
) {
2751 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2752 md_unregister_thread(mddev
->sync_thread
);
2753 mddev
->sync_thread
= NULL
;
2754 mddev
->recovery
= 0;
2756 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2757 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2759 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2760 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2761 else if (cmd_match(page
, "reshape")) {
2763 if (mddev
->pers
->start_reshape
== NULL
)
2765 err
= mddev
->pers
->start_reshape(mddev
);
2769 if (cmd_match(page
, "check"))
2770 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2771 else if (!cmd_match(page
, "repair"))
2773 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2774 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2776 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2777 md_wakeup_thread(mddev
->thread
);
2782 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2784 return sprintf(page
, "%llu\n",
2785 (unsigned long long) mddev
->resync_mismatches
);
2788 static struct md_sysfs_entry md_scan_mode
=
2789 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2792 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
2795 sync_min_show(mddev_t
*mddev
, char *page
)
2797 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2798 mddev
->sync_speed_min
? "local": "system");
2802 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2806 if (strncmp(buf
, "system", 6)==0) {
2807 mddev
->sync_speed_min
= 0;
2810 min
= simple_strtoul(buf
, &e
, 10);
2811 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2813 mddev
->sync_speed_min
= min
;
2817 static struct md_sysfs_entry md_sync_min
=
2818 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2821 sync_max_show(mddev_t
*mddev
, char *page
)
2823 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2824 mddev
->sync_speed_max
? "local": "system");
2828 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2832 if (strncmp(buf
, "system", 6)==0) {
2833 mddev
->sync_speed_max
= 0;
2836 max
= simple_strtoul(buf
, &e
, 10);
2837 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2839 mddev
->sync_speed_max
= max
;
2843 static struct md_sysfs_entry md_sync_max
=
2844 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2848 sync_speed_show(mddev_t
*mddev
, char *page
)
2850 unsigned long resync
, dt
, db
;
2851 resync
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
));
2852 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2854 db
= resync
- (mddev
->resync_mark_cnt
);
2855 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2858 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
2861 sync_completed_show(mddev_t
*mddev
, char *page
)
2863 unsigned long max_blocks
, resync
;
2865 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2866 max_blocks
= mddev
->resync_max_sectors
;
2868 max_blocks
= mddev
->size
<< 1;
2870 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2871 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2874 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
2877 suspend_lo_show(mddev_t
*mddev
, char *page
)
2879 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
2883 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2886 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2888 if (mddev
->pers
->quiesce
== NULL
)
2890 if (buf
== e
|| (*e
&& *e
!= '\n'))
2892 if (new >= mddev
->suspend_hi
||
2893 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
2894 mddev
->suspend_lo
= new;
2895 mddev
->pers
->quiesce(mddev
, 2);
2900 static struct md_sysfs_entry md_suspend_lo
=
2901 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
2905 suspend_hi_show(mddev_t
*mddev
, char *page
)
2907 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
2911 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2914 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2916 if (mddev
->pers
->quiesce
== NULL
)
2918 if (buf
== e
|| (*e
&& *e
!= '\n'))
2920 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
2921 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
2922 mddev
->suspend_hi
= new;
2923 mddev
->pers
->quiesce(mddev
, 1);
2924 mddev
->pers
->quiesce(mddev
, 0);
2929 static struct md_sysfs_entry md_suspend_hi
=
2930 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
2933 reshape_position_show(mddev_t
*mddev
, char *page
)
2935 if (mddev
->reshape_position
!= MaxSector
)
2936 return sprintf(page
, "%llu\n",
2937 (unsigned long long)mddev
->reshape_position
);
2938 strcpy(page
, "none\n");
2943 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2946 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2949 if (buf
== e
|| (*e
&& *e
!= '\n'))
2951 mddev
->reshape_position
= new;
2952 mddev
->delta_disks
= 0;
2953 mddev
->new_level
= mddev
->level
;
2954 mddev
->new_layout
= mddev
->layout
;
2955 mddev
->new_chunk
= mddev
->chunk_size
;
2959 static struct md_sysfs_entry md_reshape_position
=
2960 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
2961 reshape_position_store
);
2964 static struct attribute
*md_default_attrs
[] = {
2967 &md_raid_disks
.attr
,
2968 &md_chunk_size
.attr
,
2970 &md_resync_start
.attr
,
2972 &md_new_device
.attr
,
2973 &md_safe_delay
.attr
,
2974 &md_array_state
.attr
,
2975 &md_reshape_position
.attr
,
2979 static struct attribute
*md_redundancy_attrs
[] = {
2981 &md_mismatches
.attr
,
2984 &md_sync_speed
.attr
,
2985 &md_sync_completed
.attr
,
2986 &md_suspend_lo
.attr
,
2987 &md_suspend_hi
.attr
,
2991 static struct attribute_group md_redundancy_group
= {
2993 .attrs
= md_redundancy_attrs
,
2998 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3000 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3001 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3006 rv
= mddev_lock(mddev
);
3008 rv
= entry
->show(mddev
, page
);
3009 mddev_unlock(mddev
);
3015 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3016 const char *page
, size_t length
)
3018 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3019 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3024 if (!capable(CAP_SYS_ADMIN
))
3026 rv
= mddev_lock(mddev
);
3028 rv
= entry
->store(mddev
, page
, length
);
3029 mddev_unlock(mddev
);
3034 static void md_free(struct kobject
*ko
)
3036 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3040 static struct sysfs_ops md_sysfs_ops
= {
3041 .show
= md_attr_show
,
3042 .store
= md_attr_store
,
3044 static struct kobj_type md_ktype
= {
3046 .sysfs_ops
= &md_sysfs_ops
,
3047 .default_attrs
= md_default_attrs
,
3052 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3054 static DEFINE_MUTEX(disks_mutex
);
3055 mddev_t
*mddev
= mddev_find(dev
);
3056 struct gendisk
*disk
;
3057 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3058 int shift
= partitioned
? MdpMinorShift
: 0;
3059 int unit
= MINOR(dev
) >> shift
;
3064 mutex_lock(&disks_mutex
);
3065 if (mddev
->gendisk
) {
3066 mutex_unlock(&disks_mutex
);
3070 disk
= alloc_disk(1 << shift
);
3072 mutex_unlock(&disks_mutex
);
3076 disk
->major
= MAJOR(dev
);
3077 disk
->first_minor
= unit
<< shift
;
3079 sprintf(disk
->disk_name
, "md_d%d", unit
);
3081 sprintf(disk
->disk_name
, "md%d", unit
);
3082 disk
->fops
= &md_fops
;
3083 disk
->private_data
= mddev
;
3084 disk
->queue
= mddev
->queue
;
3086 mddev
->gendisk
= disk
;
3087 mutex_unlock(&disks_mutex
);
3088 mddev
->kobj
.parent
= &disk
->kobj
;
3089 mddev
->kobj
.k_name
= NULL
;
3090 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
3091 mddev
->kobj
.ktype
= &md_ktype
;
3092 if (kobject_register(&mddev
->kobj
))
3093 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3098 static void md_safemode_timeout(unsigned long data
)
3100 mddev_t
*mddev
= (mddev_t
*) data
;
3102 mddev
->safemode
= 1;
3103 md_wakeup_thread(mddev
->thread
);
3106 static int start_dirty_degraded
;
3108 static int do_md_run(mddev_t
* mddev
)
3112 struct list_head
*tmp
;
3114 struct gendisk
*disk
;
3115 struct mdk_personality
*pers
;
3116 char b
[BDEVNAME_SIZE
];
3118 if (list_empty(&mddev
->disks
))
3119 /* cannot run an array with no devices.. */
3126 * Analyze all RAID superblock(s)
3128 if (!mddev
->raid_disks
)
3131 chunk_size
= mddev
->chunk_size
;
3134 if (chunk_size
> MAX_CHUNK_SIZE
) {
3135 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3136 chunk_size
, MAX_CHUNK_SIZE
);
3140 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3142 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3143 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3146 if (chunk_size
< PAGE_SIZE
) {
3147 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3148 chunk_size
, PAGE_SIZE
);
3152 /* devices must have minimum size of one chunk */
3153 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3154 if (test_bit(Faulty
, &rdev
->flags
))
3156 if (rdev
->size
< chunk_size
/ 1024) {
3158 "md: Dev %s smaller than chunk_size:"
3160 bdevname(rdev
->bdev
,b
),
3161 (unsigned long long)rdev
->size
,
3169 if (mddev
->level
!= LEVEL_NONE
)
3170 request_module("md-level-%d", mddev
->level
);
3171 else if (mddev
->clevel
[0])
3172 request_module("md-%s", mddev
->clevel
);
3176 * Drop all container device buffers, from now on
3177 * the only valid external interface is through the md
3179 * Also find largest hardsector size
3181 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3182 if (test_bit(Faulty
, &rdev
->flags
))
3184 sync_blockdev(rdev
->bdev
);
3185 invalidate_bdev(rdev
->bdev
);
3188 md_probe(mddev
->unit
, NULL
, NULL
);
3189 disk
= mddev
->gendisk
;
3193 spin_lock(&pers_lock
);
3194 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3195 if (!pers
|| !try_module_get(pers
->owner
)) {
3196 spin_unlock(&pers_lock
);
3197 if (mddev
->level
!= LEVEL_NONE
)
3198 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3201 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3206 spin_unlock(&pers_lock
);
3207 mddev
->level
= pers
->level
;
3208 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3210 if (mddev
->reshape_position
!= MaxSector
&&
3211 pers
->start_reshape
== NULL
) {
3212 /* This personality cannot handle reshaping... */
3214 module_put(pers
->owner
);
3218 if (pers
->sync_request
) {
3219 /* Warn if this is a potentially silly
3222 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3224 struct list_head
*tmp2
;
3226 ITERATE_RDEV(mddev
, rdev
, tmp
) {
3227 ITERATE_RDEV(mddev
, rdev2
, tmp2
) {
3229 rdev
->bdev
->bd_contains
==
3230 rdev2
->bdev
->bd_contains
) {
3232 "%s: WARNING: %s appears to be"
3233 " on the same physical disk as"
3236 bdevname(rdev
->bdev
,b
),
3237 bdevname(rdev2
->bdev
,b2
));
3244 "True protection against single-disk"
3245 " failure might be compromised.\n");
3248 mddev
->recovery
= 0;
3249 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3250 mddev
->barriers_work
= 1;
3251 mddev
->ok_start_degraded
= start_dirty_degraded
;
3254 mddev
->ro
= 2; /* read-only, but switch on first write */
3256 err
= mddev
->pers
->run(mddev
);
3257 if (!err
&& mddev
->pers
->sync_request
) {
3258 err
= bitmap_create(mddev
);
3260 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3261 mdname(mddev
), err
);
3262 mddev
->pers
->stop(mddev
);
3266 printk(KERN_ERR
"md: pers->run() failed ...\n");
3267 module_put(mddev
->pers
->owner
);
3269 bitmap_destroy(mddev
);
3272 if (mddev
->pers
->sync_request
) {
3273 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3275 "md: cannot register extra attributes for %s\n",
3277 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3280 atomic_set(&mddev
->writes_pending
,0);
3281 mddev
->safemode
= 0;
3282 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3283 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3284 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3287 ITERATE_RDEV(mddev
,rdev
,tmp
)
3288 if (rdev
->raid_disk
>= 0) {
3290 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3291 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3292 printk("md: cannot register %s for %s\n",
3296 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3299 md_update_sb(mddev
, 0);
3301 set_capacity(disk
, mddev
->array_size
<<1);
3303 /* If we call blk_queue_make_request here, it will
3304 * re-initialise max_sectors etc which may have been
3305 * refined inside -> run. So just set the bits we need to set.
3306 * Most initialisation happended when we called
3307 * blk_queue_make_request(..., md_fail_request)
3310 mddev
->queue
->queuedata
= mddev
;
3311 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3313 /* If there is a partially-recovered drive we need to
3314 * start recovery here. If we leave it to md_check_recovery,
3315 * it will remove the drives and not do the right thing
3317 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3318 struct list_head
*rtmp
;
3320 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3321 if (rdev
->raid_disk
>= 0 &&
3322 !test_bit(In_sync
, &rdev
->flags
) &&
3323 !test_bit(Faulty
, &rdev
->flags
))
3324 /* complete an interrupted recovery */
3326 if (spares
&& mddev
->pers
->sync_request
) {
3327 mddev
->recovery
= 0;
3328 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3329 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3332 if (!mddev
->sync_thread
) {
3333 printk(KERN_ERR
"%s: could not start resync"
3336 /* leave the spares where they are, it shouldn't hurt */
3337 mddev
->recovery
= 0;
3341 md_wakeup_thread(mddev
->thread
);
3342 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3345 md_new_event(mddev
);
3346 kobject_uevent(&mddev
->gendisk
->kobj
, KOBJ_CHANGE
);
3350 static int restart_array(mddev_t
*mddev
)
3352 struct gendisk
*disk
= mddev
->gendisk
;
3356 * Complain if it has no devices
3359 if (list_empty(&mddev
->disks
))
3367 mddev
->safemode
= 0;
3369 set_disk_ro(disk
, 0);
3371 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3374 * Kick recovery or resync if necessary
3376 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3377 md_wakeup_thread(mddev
->thread
);
3378 md_wakeup_thread(mddev
->sync_thread
);
3387 /* similar to deny_write_access, but accounts for our holding a reference
3388 * to the file ourselves */
3389 static int deny_bitmap_write_access(struct file
* file
)
3391 struct inode
*inode
= file
->f_mapping
->host
;
3393 spin_lock(&inode
->i_lock
);
3394 if (atomic_read(&inode
->i_writecount
) > 1) {
3395 spin_unlock(&inode
->i_lock
);
3398 atomic_set(&inode
->i_writecount
, -1);
3399 spin_unlock(&inode
->i_lock
);
3404 static void restore_bitmap_write_access(struct file
*file
)
3406 struct inode
*inode
= file
->f_mapping
->host
;
3408 spin_lock(&inode
->i_lock
);
3409 atomic_set(&inode
->i_writecount
, 1);
3410 spin_unlock(&inode
->i_lock
);
3414 * 0 - completely stop and dis-assemble array
3415 * 1 - switch to readonly
3416 * 2 - stop but do not disassemble array
3418 static int do_md_stop(mddev_t
* mddev
, int mode
)
3421 struct gendisk
*disk
= mddev
->gendisk
;
3424 if (atomic_read(&mddev
->active
)>2) {
3425 printk("md: %s still in use.\n",mdname(mddev
));
3429 if (mddev
->sync_thread
) {
3430 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3431 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3432 md_unregister_thread(mddev
->sync_thread
);
3433 mddev
->sync_thread
= NULL
;
3436 del_timer_sync(&mddev
->safemode_timer
);
3438 invalidate_partition(disk
, 0);
3441 case 1: /* readonly */
3447 case 0: /* disassemble */
3449 bitmap_flush(mddev
);
3450 md_super_wait(mddev
);
3452 set_disk_ro(disk
, 0);
3453 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3454 mddev
->pers
->stop(mddev
);
3455 mddev
->queue
->merge_bvec_fn
= NULL
;
3456 mddev
->queue
->unplug_fn
= NULL
;
3457 mddev
->queue
->issue_flush_fn
= NULL
;
3458 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3459 if (mddev
->pers
->sync_request
)
3460 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3462 module_put(mddev
->pers
->owner
);
3465 set_capacity(disk
, 0);
3471 if (!mddev
->in_sync
|| mddev
->flags
) {
3472 /* mark array as shutdown cleanly */
3474 md_update_sb(mddev
, 1);
3477 set_disk_ro(disk
, 1);
3478 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3482 * Free resources if final stop
3486 struct list_head
*tmp
;
3488 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3490 bitmap_destroy(mddev
);
3491 if (mddev
->bitmap_file
) {
3492 restore_bitmap_write_access(mddev
->bitmap_file
);
3493 fput(mddev
->bitmap_file
);
3494 mddev
->bitmap_file
= NULL
;
3496 mddev
->bitmap_offset
= 0;
3498 ITERATE_RDEV(mddev
,rdev
,tmp
)
3499 if (rdev
->raid_disk
>= 0) {
3501 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3502 sysfs_remove_link(&mddev
->kobj
, nm
);
3505 /* make sure all delayed_delete calls have finished */
3506 flush_scheduled_work();
3508 export_array(mddev
);
3510 mddev
->array_size
= 0;
3512 mddev
->raid_disks
= 0;
3513 mddev
->recovery_cp
= 0;
3514 mddev
->reshape_position
= MaxSector
;
3516 } else if (mddev
->pers
)
3517 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3520 md_new_event(mddev
);
3526 static void autorun_array(mddev_t
*mddev
)
3529 struct list_head
*tmp
;
3532 if (list_empty(&mddev
->disks
))
3535 printk(KERN_INFO
"md: running: ");
3537 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3538 char b
[BDEVNAME_SIZE
];
3539 printk("<%s>", bdevname(rdev
->bdev
,b
));
3543 err
= do_md_run (mddev
);
3545 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3546 do_md_stop (mddev
, 0);
3551 * lets try to run arrays based on all disks that have arrived
3552 * until now. (those are in pending_raid_disks)
3554 * the method: pick the first pending disk, collect all disks with
3555 * the same UUID, remove all from the pending list and put them into
3556 * the 'same_array' list. Then order this list based on superblock
3557 * update time (freshest comes first), kick out 'old' disks and
3558 * compare superblocks. If everything's fine then run it.
3560 * If "unit" is allocated, then bump its reference count
3562 static void autorun_devices(int part
)
3564 struct list_head
*tmp
;
3565 mdk_rdev_t
*rdev0
, *rdev
;
3567 char b
[BDEVNAME_SIZE
];
3569 printk(KERN_INFO
"md: autorun ...\n");
3570 while (!list_empty(&pending_raid_disks
)) {
3573 LIST_HEAD(candidates
);
3574 rdev0
= list_entry(pending_raid_disks
.next
,
3575 mdk_rdev_t
, same_set
);
3577 printk(KERN_INFO
"md: considering %s ...\n",
3578 bdevname(rdev0
->bdev
,b
));
3579 INIT_LIST_HEAD(&candidates
);
3580 ITERATE_RDEV_PENDING(rdev
,tmp
)
3581 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3582 printk(KERN_INFO
"md: adding %s ...\n",
3583 bdevname(rdev
->bdev
,b
));
3584 list_move(&rdev
->same_set
, &candidates
);
3587 * now we have a set of devices, with all of them having
3588 * mostly sane superblocks. It's time to allocate the
3592 dev
= MKDEV(mdp_major
,
3593 rdev0
->preferred_minor
<< MdpMinorShift
);
3594 unit
= MINOR(dev
) >> MdpMinorShift
;
3596 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
3599 if (rdev0
->preferred_minor
!= unit
) {
3600 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
3601 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
3605 md_probe(dev
, NULL
, NULL
);
3606 mddev
= mddev_find(dev
);
3609 "md: cannot allocate memory for md drive.\n");
3612 if (mddev_lock(mddev
))
3613 printk(KERN_WARNING
"md: %s locked, cannot run\n",
3615 else if (mddev
->raid_disks
|| mddev
->major_version
3616 || !list_empty(&mddev
->disks
)) {
3618 "md: %s already running, cannot run %s\n",
3619 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
3620 mddev_unlock(mddev
);
3622 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
3623 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
3624 list_del_init(&rdev
->same_set
);
3625 if (bind_rdev_to_array(rdev
, mddev
))
3628 autorun_array(mddev
);
3629 mddev_unlock(mddev
);
3631 /* on success, candidates will be empty, on error
3634 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
3638 printk(KERN_INFO
"md: ... autorun DONE.\n");
3640 #endif /* !MODULE */
3642 static int get_version(void __user
* arg
)
3646 ver
.major
= MD_MAJOR_VERSION
;
3647 ver
.minor
= MD_MINOR_VERSION
;
3648 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3650 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3656 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3658 mdu_array_info_t info
;
3659 int nr
,working
,active
,failed
,spare
;
3661 struct list_head
*tmp
;
3663 nr
=working
=active
=failed
=spare
=0;
3664 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3666 if (test_bit(Faulty
, &rdev
->flags
))
3670 if (test_bit(In_sync
, &rdev
->flags
))
3677 info
.major_version
= mddev
->major_version
;
3678 info
.minor_version
= mddev
->minor_version
;
3679 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3680 info
.ctime
= mddev
->ctime
;
3681 info
.level
= mddev
->level
;
3682 info
.size
= mddev
->size
;
3683 if (info
.size
!= mddev
->size
) /* overflow */
3686 info
.raid_disks
= mddev
->raid_disks
;
3687 info
.md_minor
= mddev
->md_minor
;
3688 info
.not_persistent
= !mddev
->persistent
;
3690 info
.utime
= mddev
->utime
;
3693 info
.state
= (1<<MD_SB_CLEAN
);
3694 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3695 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3696 info
.active_disks
= active
;
3697 info
.working_disks
= working
;
3698 info
.failed_disks
= failed
;
3699 info
.spare_disks
= spare
;
3701 info
.layout
= mddev
->layout
;
3702 info
.chunk_size
= mddev
->chunk_size
;
3704 if (copy_to_user(arg
, &info
, sizeof(info
)))
3710 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3712 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3713 char *ptr
, *buf
= NULL
;
3716 md_allow_write(mddev
);
3718 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3722 /* bitmap disabled, zero the first byte and copy out */
3723 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3724 file
->pathname
[0] = '\0';
3728 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3732 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3736 strcpy(file
->pathname
, ptr
);
3740 if (copy_to_user(arg
, file
, sizeof(*file
)))
3748 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3750 mdu_disk_info_t info
;
3754 if (copy_from_user(&info
, arg
, sizeof(info
)))
3759 rdev
= find_rdev_nr(mddev
, nr
);
3761 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3762 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3763 info
.raid_disk
= rdev
->raid_disk
;
3765 if (test_bit(Faulty
, &rdev
->flags
))
3766 info
.state
|= (1<<MD_DISK_FAULTY
);
3767 else if (test_bit(In_sync
, &rdev
->flags
)) {
3768 info
.state
|= (1<<MD_DISK_ACTIVE
);
3769 info
.state
|= (1<<MD_DISK_SYNC
);
3771 if (test_bit(WriteMostly
, &rdev
->flags
))
3772 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3774 info
.major
= info
.minor
= 0;
3775 info
.raid_disk
= -1;
3776 info
.state
= (1<<MD_DISK_REMOVED
);
3779 if (copy_to_user(arg
, &info
, sizeof(info
)))
3785 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3787 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3789 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3791 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3794 if (!mddev
->raid_disks
) {
3796 /* expecting a device which has a superblock */
3797 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3800 "md: md_import_device returned %ld\n",
3802 return PTR_ERR(rdev
);
3804 if (!list_empty(&mddev
->disks
)) {
3805 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3806 mdk_rdev_t
, same_set
);
3807 int err
= super_types
[mddev
->major_version
]
3808 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3811 "md: %s has different UUID to %s\n",
3812 bdevname(rdev
->bdev
,b
),
3813 bdevname(rdev0
->bdev
,b2
));
3818 err
= bind_rdev_to_array(rdev
, mddev
);
3825 * add_new_disk can be used once the array is assembled
3826 * to add "hot spares". They must already have a superblock
3831 if (!mddev
->pers
->hot_add_disk
) {
3833 "%s: personality does not support diskops!\n",
3837 if (mddev
->persistent
)
3838 rdev
= md_import_device(dev
, mddev
->major_version
,
3839 mddev
->minor_version
);
3841 rdev
= md_import_device(dev
, -1, -1);
3844 "md: md_import_device returned %ld\n",
3846 return PTR_ERR(rdev
);
3848 /* set save_raid_disk if appropriate */
3849 if (!mddev
->persistent
) {
3850 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3851 info
->raid_disk
< mddev
->raid_disks
)
3852 rdev
->raid_disk
= info
->raid_disk
;
3854 rdev
->raid_disk
= -1;
3856 super_types
[mddev
->major_version
].
3857 validate_super(mddev
, rdev
);
3858 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3860 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3861 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3862 set_bit(WriteMostly
, &rdev
->flags
);
3864 rdev
->raid_disk
= -1;
3865 err
= bind_rdev_to_array(rdev
, mddev
);
3866 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
3867 /* If there is hot_add_disk but no hot_remove_disk
3868 * then added disks for geometry changes,
3869 * and should be added immediately.
3871 super_types
[mddev
->major_version
].
3872 validate_super(mddev
, rdev
);
3873 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
3875 unbind_rdev_from_array(rdev
);
3880 md_update_sb(mddev
, 1);
3881 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3882 md_wakeup_thread(mddev
->thread
);
3886 /* otherwise, add_new_disk is only allowed
3887 * for major_version==0 superblocks
3889 if (mddev
->major_version
!= 0) {
3890 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3895 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3897 rdev
= md_import_device (dev
, -1, 0);
3900 "md: error, md_import_device() returned %ld\n",
3902 return PTR_ERR(rdev
);
3904 rdev
->desc_nr
= info
->number
;
3905 if (info
->raid_disk
< mddev
->raid_disks
)
3906 rdev
->raid_disk
= info
->raid_disk
;
3908 rdev
->raid_disk
= -1;
3912 if (rdev
->raid_disk
< mddev
->raid_disks
)
3913 if (info
->state
& (1<<MD_DISK_SYNC
))
3914 set_bit(In_sync
, &rdev
->flags
);
3916 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3917 set_bit(WriteMostly
, &rdev
->flags
);
3919 if (!mddev
->persistent
) {
3920 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3921 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3923 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3924 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3926 err
= bind_rdev_to_array(rdev
, mddev
);
3936 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3938 char b
[BDEVNAME_SIZE
];
3944 rdev
= find_rdev(mddev
, dev
);
3948 if (rdev
->raid_disk
>= 0)
3951 kick_rdev_from_array(rdev
);
3952 md_update_sb(mddev
, 1);
3953 md_new_event(mddev
);
3957 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3958 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3962 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3964 char b
[BDEVNAME_SIZE
];
3972 if (mddev
->major_version
!= 0) {
3973 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3974 " version-0 superblocks.\n",
3978 if (!mddev
->pers
->hot_add_disk
) {
3980 "%s: personality does not support diskops!\n",
3985 rdev
= md_import_device (dev
, -1, 0);
3988 "md: error, md_import_device() returned %ld\n",
3993 if (mddev
->persistent
)
3994 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3997 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3999 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4002 if (test_bit(Faulty
, &rdev
->flags
)) {
4004 "md: can not hot-add faulty %s disk to %s!\n",
4005 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4009 clear_bit(In_sync
, &rdev
->flags
);
4011 rdev
->saved_raid_disk
= -1;
4012 err
= bind_rdev_to_array(rdev
, mddev
);
4017 * The rest should better be atomic, we can have disk failures
4018 * noticed in interrupt contexts ...
4021 if (rdev
->desc_nr
== mddev
->max_disks
) {
4022 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4025 goto abort_unbind_export
;
4028 rdev
->raid_disk
= -1;
4030 md_update_sb(mddev
, 1);
4033 * Kick recovery, maybe this spare has to be added to the
4034 * array immediately.
4036 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4037 md_wakeup_thread(mddev
->thread
);
4038 md_new_event(mddev
);
4041 abort_unbind_export
:
4042 unbind_rdev_from_array(rdev
);
4049 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4054 if (!mddev
->pers
->quiesce
)
4056 if (mddev
->recovery
|| mddev
->sync_thread
)
4058 /* we should be able to change the bitmap.. */
4064 return -EEXIST
; /* cannot add when bitmap is present */
4065 mddev
->bitmap_file
= fget(fd
);
4067 if (mddev
->bitmap_file
== NULL
) {
4068 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4073 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4075 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4077 fput(mddev
->bitmap_file
);
4078 mddev
->bitmap_file
= NULL
;
4081 mddev
->bitmap_offset
= 0; /* file overrides offset */
4082 } else if (mddev
->bitmap
== NULL
)
4083 return -ENOENT
; /* cannot remove what isn't there */
4086 mddev
->pers
->quiesce(mddev
, 1);
4088 err
= bitmap_create(mddev
);
4089 if (fd
< 0 || err
) {
4090 bitmap_destroy(mddev
);
4091 fd
= -1; /* make sure to put the file */
4093 mddev
->pers
->quiesce(mddev
, 0);
4096 if (mddev
->bitmap_file
) {
4097 restore_bitmap_write_access(mddev
->bitmap_file
);
4098 fput(mddev
->bitmap_file
);
4100 mddev
->bitmap_file
= NULL
;
4107 * set_array_info is used two different ways
4108 * The original usage is when creating a new array.
4109 * In this usage, raid_disks is > 0 and it together with
4110 * level, size, not_persistent,layout,chunksize determine the
4111 * shape of the array.
4112 * This will always create an array with a type-0.90.0 superblock.
4113 * The newer usage is when assembling an array.
4114 * In this case raid_disks will be 0, and the major_version field is
4115 * use to determine which style super-blocks are to be found on the devices.
4116 * The minor and patch _version numbers are also kept incase the
4117 * super_block handler wishes to interpret them.
4119 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4122 if (info
->raid_disks
== 0) {
4123 /* just setting version number for superblock loading */
4124 if (info
->major_version
< 0 ||
4125 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4126 super_types
[info
->major_version
].name
== NULL
) {
4127 /* maybe try to auto-load a module? */
4129 "md: superblock version %d not known\n",
4130 info
->major_version
);
4133 mddev
->major_version
= info
->major_version
;
4134 mddev
->minor_version
= info
->minor_version
;
4135 mddev
->patch_version
= info
->patch_version
;
4136 mddev
->persistent
= !info
->not_persistent
;
4139 mddev
->major_version
= MD_MAJOR_VERSION
;
4140 mddev
->minor_version
= MD_MINOR_VERSION
;
4141 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4142 mddev
->ctime
= get_seconds();
4144 mddev
->level
= info
->level
;
4145 mddev
->clevel
[0] = 0;
4146 mddev
->size
= info
->size
;
4147 mddev
->raid_disks
= info
->raid_disks
;
4148 /* don't set md_minor, it is determined by which /dev/md* was
4151 if (info
->state
& (1<<MD_SB_CLEAN
))
4152 mddev
->recovery_cp
= MaxSector
;
4154 mddev
->recovery_cp
= 0;
4155 mddev
->persistent
= ! info
->not_persistent
;
4157 mddev
->layout
= info
->layout
;
4158 mddev
->chunk_size
= info
->chunk_size
;
4160 mddev
->max_disks
= MD_SB_DISKS
;
4163 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4165 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4166 mddev
->bitmap_offset
= 0;
4168 mddev
->reshape_position
= MaxSector
;
4171 * Generate a 128 bit UUID
4173 get_random_bytes(mddev
->uuid
, 16);
4175 mddev
->new_level
= mddev
->level
;
4176 mddev
->new_chunk
= mddev
->chunk_size
;
4177 mddev
->new_layout
= mddev
->layout
;
4178 mddev
->delta_disks
= 0;
4183 static int update_size(mddev_t
*mddev
, unsigned long size
)
4187 struct list_head
*tmp
;
4188 int fit
= (size
== 0);
4190 if (mddev
->pers
->resize
== NULL
)
4192 /* The "size" is the amount of each device that is used.
4193 * This can only make sense for arrays with redundancy.
4194 * linear and raid0 always use whatever space is available
4195 * We can only consider changing the size if no resync
4196 * or reconstruction is happening, and if the new size
4197 * is acceptable. It must fit before the sb_offset or,
4198 * if that is <data_offset, it must fit before the
4199 * size of each device.
4200 * If size is zero, we find the largest size that fits.
4202 if (mddev
->sync_thread
)
4204 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4206 avail
= rdev
->size
* 2;
4208 if (fit
&& (size
== 0 || size
> avail
/2))
4210 if (avail
< ((sector_t
)size
<< 1))
4213 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4215 struct block_device
*bdev
;
4217 bdev
= bdget_disk(mddev
->gendisk
, 0);
4219 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4220 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4221 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4228 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4231 /* change the number of raid disks */
4232 if (mddev
->pers
->check_reshape
== NULL
)
4234 if (raid_disks
<= 0 ||
4235 raid_disks
>= mddev
->max_disks
)
4237 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4239 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4241 rv
= mddev
->pers
->check_reshape(mddev
);
4247 * update_array_info is used to change the configuration of an
4249 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4250 * fields in the info are checked against the array.
4251 * Any differences that cannot be handled will cause an error.
4252 * Normally, only one change can be managed at a time.
4254 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4260 /* calculate expected state,ignoring low bits */
4261 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4262 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4264 if (mddev
->major_version
!= info
->major_version
||
4265 mddev
->minor_version
!= info
->minor_version
||
4266 /* mddev->patch_version != info->patch_version || */
4267 mddev
->ctime
!= info
->ctime
||
4268 mddev
->level
!= info
->level
||
4269 /* mddev->layout != info->layout || */
4270 !mddev
->persistent
!= info
->not_persistent
||
4271 mddev
->chunk_size
!= info
->chunk_size
||
4272 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4273 ((state
^info
->state
) & 0xfffffe00)
4276 /* Check there is only one change */
4277 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4278 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4279 if (mddev
->layout
!= info
->layout
) cnt
++;
4280 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4281 if (cnt
== 0) return 0;
4282 if (cnt
> 1) return -EINVAL
;
4284 if (mddev
->layout
!= info
->layout
) {
4286 * we don't need to do anything at the md level, the
4287 * personality will take care of it all.
4289 if (mddev
->pers
->reconfig
== NULL
)
4292 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4294 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4295 rv
= update_size(mddev
, info
->size
);
4297 if (mddev
->raid_disks
!= info
->raid_disks
)
4298 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4300 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4301 if (mddev
->pers
->quiesce
== NULL
)
4303 if (mddev
->recovery
|| mddev
->sync_thread
)
4305 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4306 /* add the bitmap */
4309 if (mddev
->default_bitmap_offset
== 0)
4311 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4312 mddev
->pers
->quiesce(mddev
, 1);
4313 rv
= bitmap_create(mddev
);
4315 bitmap_destroy(mddev
);
4316 mddev
->pers
->quiesce(mddev
, 0);
4318 /* remove the bitmap */
4321 if (mddev
->bitmap
->file
)
4323 mddev
->pers
->quiesce(mddev
, 1);
4324 bitmap_destroy(mddev
);
4325 mddev
->pers
->quiesce(mddev
, 0);
4326 mddev
->bitmap_offset
= 0;
4329 md_update_sb(mddev
, 1);
4333 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4337 if (mddev
->pers
== NULL
)
4340 rdev
= find_rdev(mddev
, dev
);
4344 md_error(mddev
, rdev
);
4348 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4350 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4354 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4358 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4359 unsigned int cmd
, unsigned long arg
)
4362 void __user
*argp
= (void __user
*)arg
;
4363 mddev_t
*mddev
= NULL
;
4365 if (!capable(CAP_SYS_ADMIN
))
4369 * Commands dealing with the RAID driver but not any
4375 err
= get_version(argp
);
4378 case PRINT_RAID_DEBUG
:
4386 autostart_arrays(arg
);
4393 * Commands creating/starting a new array:
4396 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4403 err
= mddev_lock(mddev
);
4406 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4413 case SET_ARRAY_INFO
:
4415 mdu_array_info_t info
;
4417 memset(&info
, 0, sizeof(info
));
4418 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4423 err
= update_array_info(mddev
, &info
);
4425 printk(KERN_WARNING
"md: couldn't update"
4426 " array info. %d\n", err
);
4431 if (!list_empty(&mddev
->disks
)) {
4433 "md: array %s already has disks!\n",
4438 if (mddev
->raid_disks
) {
4440 "md: array %s already initialised!\n",
4445 err
= set_array_info(mddev
, &info
);
4447 printk(KERN_WARNING
"md: couldn't set"
4448 " array info. %d\n", err
);
4458 * Commands querying/configuring an existing array:
4460 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4461 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4462 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4463 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4464 && cmd
!= GET_BITMAP_FILE
) {
4470 * Commands even a read-only array can execute:
4474 case GET_ARRAY_INFO
:
4475 err
= get_array_info(mddev
, argp
);
4478 case GET_BITMAP_FILE
:
4479 err
= get_bitmap_file(mddev
, argp
);
4483 err
= get_disk_info(mddev
, argp
);
4486 case RESTART_ARRAY_RW
:
4487 err
= restart_array(mddev
);
4491 err
= do_md_stop (mddev
, 0);
4495 err
= do_md_stop (mddev
, 1);
4499 * We have a problem here : there is no easy way to give a CHS
4500 * virtual geometry. We currently pretend that we have a 2 heads
4501 * 4 sectors (with a BIG number of cylinders...). This drives
4502 * dosfs just mad... ;-)
4507 * The remaining ioctls are changing the state of the
4508 * superblock, so we do not allow them on read-only arrays.
4509 * However non-MD ioctls (e.g. get-size) will still come through
4510 * here and hit the 'default' below, so only disallow
4511 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4513 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
4514 mddev
->ro
&& mddev
->pers
) {
4515 if (mddev
->ro
== 2) {
4517 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4518 md_wakeup_thread(mddev
->thread
);
4530 mdu_disk_info_t info
;
4531 if (copy_from_user(&info
, argp
, sizeof(info
)))
4534 err
= add_new_disk(mddev
, &info
);
4538 case HOT_REMOVE_DISK
:
4539 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4543 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4546 case SET_DISK_FAULTY
:
4547 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4551 err
= do_md_run (mddev
);
4554 case SET_BITMAP_FILE
:
4555 err
= set_bitmap_file(mddev
, (int)arg
);
4565 mddev_unlock(mddev
);
4575 static int md_open(struct inode
*inode
, struct file
*file
)
4578 * Succeed if we can lock the mddev, which confirms that
4579 * it isn't being stopped right now.
4581 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4584 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
4589 mddev_unlock(mddev
);
4591 check_disk_change(inode
->i_bdev
);
4596 static int md_release(struct inode
*inode
, struct file
* file
)
4598 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4606 static int md_media_changed(struct gendisk
*disk
)
4608 mddev_t
*mddev
= disk
->private_data
;
4610 return mddev
->changed
;
4613 static int md_revalidate(struct gendisk
*disk
)
4615 mddev_t
*mddev
= disk
->private_data
;
4620 static struct block_device_operations md_fops
=
4622 .owner
= THIS_MODULE
,
4624 .release
= md_release
,
4626 .getgeo
= md_getgeo
,
4627 .media_changed
= md_media_changed
,
4628 .revalidate_disk
= md_revalidate
,
4631 static int md_thread(void * arg
)
4633 mdk_thread_t
*thread
= arg
;
4636 * md_thread is a 'system-thread', it's priority should be very
4637 * high. We avoid resource deadlocks individually in each
4638 * raid personality. (RAID5 does preallocation) We also use RR and
4639 * the very same RT priority as kswapd, thus we will never get
4640 * into a priority inversion deadlock.
4642 * we definitely have to have equal or higher priority than
4643 * bdflush, otherwise bdflush will deadlock if there are too
4644 * many dirty RAID5 blocks.
4647 allow_signal(SIGKILL
);
4648 while (!kthread_should_stop()) {
4650 /* We need to wait INTERRUPTIBLE so that
4651 * we don't add to the load-average.
4652 * That means we need to be sure no signals are
4655 if (signal_pending(current
))
4656 flush_signals(current
);
4658 wait_event_interruptible_timeout
4660 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4661 || kthread_should_stop(),
4664 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4666 thread
->run(thread
->mddev
);
4672 void md_wakeup_thread(mdk_thread_t
*thread
)
4675 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4676 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4677 wake_up(&thread
->wqueue
);
4681 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4684 mdk_thread_t
*thread
;
4686 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4690 init_waitqueue_head(&thread
->wqueue
);
4693 thread
->mddev
= mddev
;
4694 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4695 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4696 if (IS_ERR(thread
->tsk
)) {
4703 void md_unregister_thread(mdk_thread_t
*thread
)
4705 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
4707 kthread_stop(thread
->tsk
);
4711 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4718 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4721 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4723 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4724 __builtin_return_address(0),__builtin_return_address(1),
4725 __builtin_return_address(2),__builtin_return_address(3));
4729 if (!mddev
->pers
->error_handler
)
4731 mddev
->pers
->error_handler(mddev
,rdev
);
4732 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4733 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4734 md_wakeup_thread(mddev
->thread
);
4735 md_new_event_inintr(mddev
);
4738 /* seq_file implementation /proc/mdstat */
4740 static void status_unused(struct seq_file
*seq
)
4744 struct list_head
*tmp
;
4746 seq_printf(seq
, "unused devices: ");
4748 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4749 char b
[BDEVNAME_SIZE
];
4751 seq_printf(seq
, "%s ",
4752 bdevname(rdev
->bdev
,b
));
4755 seq_printf(seq
, "<none>");
4757 seq_printf(seq
, "\n");
4761 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4763 sector_t max_blocks
, resync
, res
;
4764 unsigned long dt
, db
, rt
;
4766 unsigned int per_milli
;
4768 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4770 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4771 max_blocks
= mddev
->resync_max_sectors
>> 1;
4773 max_blocks
= mddev
->size
;
4776 * Should not happen.
4782 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4783 * in a sector_t, and (max_blocks>>scale) will fit in a
4784 * u32, as those are the requirements for sector_div.
4785 * Thus 'scale' must be at least 10
4788 if (sizeof(sector_t
) > sizeof(unsigned long)) {
4789 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
4792 res
= (resync
>>scale
)*1000;
4793 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
4797 int i
, x
= per_milli
/50, y
= 20-x
;
4798 seq_printf(seq
, "[");
4799 for (i
= 0; i
< x
; i
++)
4800 seq_printf(seq
, "=");
4801 seq_printf(seq
, ">");
4802 for (i
= 0; i
< y
; i
++)
4803 seq_printf(seq
, ".");
4804 seq_printf(seq
, "] ");
4806 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
4807 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
4809 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
4811 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4812 "resync" : "recovery"))),
4813 per_milli
/10, per_milli
% 10,
4814 (unsigned long long) resync
,
4815 (unsigned long long) max_blocks
);
4818 * We do not want to overflow, so the order of operands and
4819 * the * 100 / 100 trick are important. We do a +1 to be
4820 * safe against division by zero. We only estimate anyway.
4822 * dt: time from mark until now
4823 * db: blocks written from mark until now
4824 * rt: remaining time
4826 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4828 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
4829 - mddev
->resync_mark_cnt
;
4830 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
4832 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4834 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
4837 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4839 struct list_head
*tmp
;
4849 spin_lock(&all_mddevs_lock
);
4850 list_for_each(tmp
,&all_mddevs
)
4852 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4854 spin_unlock(&all_mddevs_lock
);
4857 spin_unlock(&all_mddevs_lock
);
4859 return (void*)2;/* tail */
4863 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4865 struct list_head
*tmp
;
4866 mddev_t
*next_mddev
, *mddev
= v
;
4872 spin_lock(&all_mddevs_lock
);
4874 tmp
= all_mddevs
.next
;
4876 tmp
= mddev
->all_mddevs
.next
;
4877 if (tmp
!= &all_mddevs
)
4878 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4880 next_mddev
= (void*)2;
4883 spin_unlock(&all_mddevs_lock
);
4891 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4895 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4899 struct mdstat_info
{
4903 static int md_seq_show(struct seq_file
*seq
, void *v
)
4907 struct list_head
*tmp2
;
4909 struct mdstat_info
*mi
= seq
->private;
4910 struct bitmap
*bitmap
;
4912 if (v
== (void*)1) {
4913 struct mdk_personality
*pers
;
4914 seq_printf(seq
, "Personalities : ");
4915 spin_lock(&pers_lock
);
4916 list_for_each_entry(pers
, &pers_list
, list
)
4917 seq_printf(seq
, "[%s] ", pers
->name
);
4919 spin_unlock(&pers_lock
);
4920 seq_printf(seq
, "\n");
4921 mi
->event
= atomic_read(&md_event_count
);
4924 if (v
== (void*)2) {
4929 if (mddev_lock(mddev
) < 0)
4932 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4933 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4934 mddev
->pers
? "" : "in");
4937 seq_printf(seq
, " (read-only)");
4939 seq_printf(seq
, "(auto-read-only)");
4940 seq_printf(seq
, " %s", mddev
->pers
->name
);
4944 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4945 char b
[BDEVNAME_SIZE
];
4946 seq_printf(seq
, " %s[%d]",
4947 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4948 if (test_bit(WriteMostly
, &rdev
->flags
))
4949 seq_printf(seq
, "(W)");
4950 if (test_bit(Faulty
, &rdev
->flags
)) {
4951 seq_printf(seq
, "(F)");
4953 } else if (rdev
->raid_disk
< 0)
4954 seq_printf(seq
, "(S)"); /* spare */
4958 if (!list_empty(&mddev
->disks
)) {
4960 seq_printf(seq
, "\n %llu blocks",
4961 (unsigned long long)mddev
->array_size
);
4963 seq_printf(seq
, "\n %llu blocks",
4964 (unsigned long long)size
);
4966 if (mddev
->persistent
) {
4967 if (mddev
->major_version
!= 0 ||
4968 mddev
->minor_version
!= 90) {
4969 seq_printf(seq
," super %d.%d",
4970 mddev
->major_version
,
4971 mddev
->minor_version
);
4974 seq_printf(seq
, " super non-persistent");
4977 mddev
->pers
->status (seq
, mddev
);
4978 seq_printf(seq
, "\n ");
4979 if (mddev
->pers
->sync_request
) {
4980 if (mddev
->curr_resync
> 2) {
4981 status_resync (seq
, mddev
);
4982 seq_printf(seq
, "\n ");
4983 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4984 seq_printf(seq
, "\tresync=DELAYED\n ");
4985 else if (mddev
->recovery_cp
< MaxSector
)
4986 seq_printf(seq
, "\tresync=PENDING\n ");
4989 seq_printf(seq
, "\n ");
4991 if ((bitmap
= mddev
->bitmap
)) {
4992 unsigned long chunk_kb
;
4993 unsigned long flags
;
4994 spin_lock_irqsave(&bitmap
->lock
, flags
);
4995 chunk_kb
= bitmap
->chunksize
>> 10;
4996 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4998 bitmap
->pages
- bitmap
->missing_pages
,
5000 (bitmap
->pages
- bitmap
->missing_pages
)
5001 << (PAGE_SHIFT
- 10),
5002 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5003 chunk_kb
? "KB" : "B");
5005 seq_printf(seq
, ", file: ");
5006 seq_path(seq
, bitmap
->file
->f_path
.mnt
,
5007 bitmap
->file
->f_path
.dentry
," \t\n");
5010 seq_printf(seq
, "\n");
5011 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5014 seq_printf(seq
, "\n");
5016 mddev_unlock(mddev
);
5021 static struct seq_operations md_seq_ops
= {
5022 .start
= md_seq_start
,
5023 .next
= md_seq_next
,
5024 .stop
= md_seq_stop
,
5025 .show
= md_seq_show
,
5028 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5031 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5035 error
= seq_open(file
, &md_seq_ops
);
5039 struct seq_file
*p
= file
->private_data
;
5041 mi
->event
= atomic_read(&md_event_count
);
5046 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5048 struct seq_file
*m
= filp
->private_data
;
5049 struct mdstat_info
*mi
= m
->private;
5052 poll_wait(filp
, &md_event_waiters
, wait
);
5054 /* always allow read */
5055 mask
= POLLIN
| POLLRDNORM
;
5057 if (mi
->event
!= atomic_read(&md_event_count
))
5058 mask
|= POLLERR
| POLLPRI
;
5062 static const struct file_operations md_seq_fops
= {
5063 .owner
= THIS_MODULE
,
5064 .open
= md_seq_open
,
5066 .llseek
= seq_lseek
,
5067 .release
= seq_release_private
,
5068 .poll
= mdstat_poll
,
5071 int register_md_personality(struct mdk_personality
*p
)
5073 spin_lock(&pers_lock
);
5074 list_add_tail(&p
->list
, &pers_list
);
5075 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5076 spin_unlock(&pers_lock
);
5080 int unregister_md_personality(struct mdk_personality
*p
)
5082 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5083 spin_lock(&pers_lock
);
5084 list_del_init(&p
->list
);
5085 spin_unlock(&pers_lock
);
5089 static int is_mddev_idle(mddev_t
*mddev
)
5092 struct list_head
*tmp
;
5094 unsigned long curr_events
;
5097 ITERATE_RDEV(mddev
,rdev
,tmp
) {
5098 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5099 curr_events
= disk_stat_read(disk
, sectors
[0]) +
5100 disk_stat_read(disk
, sectors
[1]) -
5101 atomic_read(&disk
->sync_io
);
5102 /* The difference between curr_events and last_events
5103 * will be affected by any new non-sync IO (making
5104 * curr_events bigger) and any difference in the amount of
5105 * in-flight syncio (making current_events bigger or smaller)
5106 * The amount in-flight is currently limited to
5107 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
5108 * which is at most 4096 sectors.
5109 * These numbers are fairly fragile and should be made
5110 * more robust, probably by enforcing the
5111 * 'window size' that md_do_sync sort-of uses.
5113 * Note: the following is an unsigned comparison.
5115 if ((long)curr_events
- (long)rdev
->last_events
> 4096) {
5116 rdev
->last_events
= curr_events
;
5123 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5125 /* another "blocks" (512byte) blocks have been synced */
5126 atomic_sub(blocks
, &mddev
->recovery_active
);
5127 wake_up(&mddev
->recovery_wait
);
5129 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5130 md_wakeup_thread(mddev
->thread
);
5131 // stop recovery, signal do_sync ....
5136 /* md_write_start(mddev, bi)
5137 * If we need to update some array metadata (e.g. 'active' flag
5138 * in superblock) before writing, schedule a superblock update
5139 * and wait for it to complete.
5141 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5143 if (bio_data_dir(bi
) != WRITE
)
5146 BUG_ON(mddev
->ro
== 1);
5147 if (mddev
->ro
== 2) {
5148 /* need to switch to read/write */
5150 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5151 md_wakeup_thread(mddev
->thread
);
5153 atomic_inc(&mddev
->writes_pending
);
5154 if (mddev
->in_sync
) {
5155 spin_lock_irq(&mddev
->write_lock
);
5156 if (mddev
->in_sync
) {
5158 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5159 md_wakeup_thread(mddev
->thread
);
5161 spin_unlock_irq(&mddev
->write_lock
);
5163 wait_event(mddev
->sb_wait
, mddev
->flags
==0);
5166 void md_write_end(mddev_t
*mddev
)
5168 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5169 if (mddev
->safemode
== 2)
5170 md_wakeup_thread(mddev
->thread
);
5171 else if (mddev
->safemode_delay
)
5172 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5176 /* md_allow_write(mddev)
5177 * Calling this ensures that the array is marked 'active' so that writes
5178 * may proceed without blocking. It is important to call this before
5179 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5180 * Must be called with mddev_lock held.
5182 void md_allow_write(mddev_t
*mddev
)
5189 spin_lock_irq(&mddev
->write_lock
);
5190 if (mddev
->in_sync
) {
5192 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5193 if (mddev
->safemode_delay
&&
5194 mddev
->safemode
== 0)
5195 mddev
->safemode
= 1;
5196 spin_unlock_irq(&mddev
->write_lock
);
5197 md_update_sb(mddev
, 0);
5199 spin_unlock_irq(&mddev
->write_lock
);
5201 EXPORT_SYMBOL_GPL(md_allow_write
);
5203 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
5205 #define SYNC_MARKS 10
5206 #define SYNC_MARK_STEP (3*HZ)
5207 void md_do_sync(mddev_t
*mddev
)
5210 unsigned int currspeed
= 0,
5212 sector_t max_sectors
,j
, io_sectors
;
5213 unsigned long mark
[SYNC_MARKS
];
5214 sector_t mark_cnt
[SYNC_MARKS
];
5216 struct list_head
*tmp
;
5217 sector_t last_check
;
5219 struct list_head
*rtmp
;
5223 /* just incase thread restarts... */
5224 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5226 if (mddev
->ro
) /* never try to sync a read-only array */
5229 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5230 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5231 desc
= "data-check";
5232 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5233 desc
= "requested-resync";
5236 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5241 /* we overload curr_resync somewhat here.
5242 * 0 == not engaged in resync at all
5243 * 2 == checking that there is no conflict with another sync
5244 * 1 == like 2, but have yielded to allow conflicting resync to
5246 * other == active in resync - this many blocks
5248 * Before starting a resync we must have set curr_resync to
5249 * 2, and then checked that every "conflicting" array has curr_resync
5250 * less than ours. When we find one that is the same or higher
5251 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5252 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5253 * This will mean we have to start checking from the beginning again.
5258 mddev
->curr_resync
= 2;
5261 if (kthread_should_stop()) {
5262 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5265 ITERATE_MDDEV(mddev2
,tmp
) {
5266 if (mddev2
== mddev
)
5268 if (mddev2
->curr_resync
&&
5269 match_mddev_units(mddev
,mddev2
)) {
5271 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5272 /* arbitrarily yield */
5273 mddev
->curr_resync
= 1;
5274 wake_up(&resync_wait
);
5276 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5277 /* no need to wait here, we can wait the next
5278 * time 'round when curr_resync == 2
5281 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5282 if (!kthread_should_stop() &&
5283 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5284 printk(KERN_INFO
"md: delaying %s of %s"
5285 " until %s has finished (they"
5286 " share one or more physical units)\n",
5287 desc
, mdname(mddev
), mdname(mddev2
));
5290 finish_wait(&resync_wait
, &wq
);
5293 finish_wait(&resync_wait
, &wq
);
5296 } while (mddev
->curr_resync
< 2);
5299 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5300 /* resync follows the size requested by the personality,
5301 * which defaults to physical size, but can be virtual size
5303 max_sectors
= mddev
->resync_max_sectors
;
5304 mddev
->resync_mismatches
= 0;
5305 /* we don't use the checkpoint if there's a bitmap */
5306 if (!mddev
->bitmap
&&
5307 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5308 j
= mddev
->recovery_cp
;
5309 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5310 max_sectors
= mddev
->size
<< 1;
5312 /* recovery follows the physical size of devices */
5313 max_sectors
= mddev
->size
<< 1;
5315 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5316 if (rdev
->raid_disk
>= 0 &&
5317 !test_bit(Faulty
, &rdev
->flags
) &&
5318 !test_bit(In_sync
, &rdev
->flags
) &&
5319 rdev
->recovery_offset
< j
)
5320 j
= rdev
->recovery_offset
;
5323 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5324 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5325 " %d KB/sec/disk.\n", speed_min(mddev
));
5326 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5327 "(but not more than %d KB/sec) for %s.\n",
5328 speed_max(mddev
), desc
);
5330 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5333 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5335 mark_cnt
[m
] = io_sectors
;
5338 mddev
->resync_mark
= mark
[last_mark
];
5339 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5342 * Tune reconstruction:
5344 window
= 32*(PAGE_SIZE
/512);
5345 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5346 window
/2,(unsigned long long) max_sectors
/2);
5348 atomic_set(&mddev
->recovery_active
, 0);
5349 init_waitqueue_head(&mddev
->recovery_wait
);
5354 "md: resuming %s of %s from checkpoint.\n",
5355 desc
, mdname(mddev
));
5356 mddev
->curr_resync
= j
;
5359 while (j
< max_sectors
) {
5363 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5364 currspeed
< speed_min(mddev
));
5366 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5370 if (!skipped
) { /* actual IO requested */
5371 io_sectors
+= sectors
;
5372 atomic_add(sectors
, &mddev
->recovery_active
);
5376 if (j
>1) mddev
->curr_resync
= j
;
5377 mddev
->curr_mark_cnt
= io_sectors
;
5378 if (last_check
== 0)
5379 /* this is the earliers that rebuilt will be
5380 * visible in /proc/mdstat
5382 md_new_event(mddev
);
5384 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5387 last_check
= io_sectors
;
5389 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
5390 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
5394 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5396 int next
= (last_mark
+1) % SYNC_MARKS
;
5398 mddev
->resync_mark
= mark
[next
];
5399 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5400 mark
[next
] = jiffies
;
5401 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5406 if (kthread_should_stop()) {
5408 * got a signal, exit.
5411 "md: md_do_sync() got signal ... exiting\n");
5412 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5417 * this loop exits only if either when we are slower than
5418 * the 'hard' speed limit, or the system was IO-idle for
5420 * the system might be non-idle CPU-wise, but we only care
5421 * about not overloading the IO subsystem. (things like an
5422 * e2fsck being done on the RAID array should execute fast)
5424 mddev
->queue
->unplug_fn(mddev
->queue
);
5427 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5428 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5430 if (currspeed
> speed_min(mddev
)) {
5431 if ((currspeed
> speed_max(mddev
)) ||
5432 !is_mddev_idle(mddev
)) {
5438 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5440 * this also signals 'finished resyncing' to md_stop
5443 mddev
->queue
->unplug_fn(mddev
->queue
);
5445 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5447 /* tell personality that we are finished */
5448 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5450 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5451 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5452 mddev
->curr_resync
> 2) {
5453 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5454 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5455 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5457 "md: checkpointing %s of %s.\n",
5458 desc
, mdname(mddev
));
5459 mddev
->recovery_cp
= mddev
->curr_resync
;
5462 mddev
->recovery_cp
= MaxSector
;
5464 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5465 mddev
->curr_resync
= MaxSector
;
5466 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5467 if (rdev
->raid_disk
>= 0 &&
5468 !test_bit(Faulty
, &rdev
->flags
) &&
5469 !test_bit(In_sync
, &rdev
->flags
) &&
5470 rdev
->recovery_offset
< mddev
->curr_resync
)
5471 rdev
->recovery_offset
= mddev
->curr_resync
;
5474 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5477 mddev
->curr_resync
= 0;
5478 wake_up(&resync_wait
);
5479 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5480 md_wakeup_thread(mddev
->thread
);
5482 EXPORT_SYMBOL_GPL(md_do_sync
);
5485 static int remove_and_add_spares(mddev_t
*mddev
)
5488 struct list_head
*rtmp
;
5491 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5492 if (rdev
->raid_disk
>= 0 &&
5493 (test_bit(Faulty
, &rdev
->flags
) ||
5494 ! test_bit(In_sync
, &rdev
->flags
)) &&
5495 atomic_read(&rdev
->nr_pending
)==0) {
5496 if (mddev
->pers
->hot_remove_disk(
5497 mddev
, rdev
->raid_disk
)==0) {
5499 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5500 sysfs_remove_link(&mddev
->kobj
, nm
);
5501 rdev
->raid_disk
= -1;
5505 if (mddev
->degraded
) {
5506 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5507 if (rdev
->raid_disk
< 0
5508 && !test_bit(Faulty
, &rdev
->flags
)) {
5509 rdev
->recovery_offset
= 0;
5510 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
5512 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5513 if (sysfs_create_link(&mddev
->kobj
,
5516 "md: cannot register "
5520 md_new_event(mddev
);
5528 * This routine is regularly called by all per-raid-array threads to
5529 * deal with generic issues like resync and super-block update.
5530 * Raid personalities that don't have a thread (linear/raid0) do not
5531 * need this as they never do any recovery or update the superblock.
5533 * It does not do any resync itself, but rather "forks" off other threads
5534 * to do that as needed.
5535 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5536 * "->recovery" and create a thread at ->sync_thread.
5537 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5538 * and wakeups up this thread which will reap the thread and finish up.
5539 * This thread also removes any faulty devices (with nr_pending == 0).
5541 * The overall approach is:
5542 * 1/ if the superblock needs updating, update it.
5543 * 2/ If a recovery thread is running, don't do anything else.
5544 * 3/ If recovery has finished, clean up, possibly marking spares active.
5545 * 4/ If there are any faulty devices, remove them.
5546 * 5/ If array is degraded, try to add spares devices
5547 * 6/ If array has spares or is not in-sync, start a resync thread.
5549 void md_check_recovery(mddev_t
*mddev
)
5552 struct list_head
*rtmp
;
5556 bitmap_daemon_work(mddev
->bitmap
);
5561 if (signal_pending(current
)) {
5562 if (mddev
->pers
->sync_request
) {
5563 printk(KERN_INFO
"md: %s in immediate safe mode\n",
5565 mddev
->safemode
= 2;
5567 flush_signals(current
);
5572 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
5573 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
5574 (mddev
->safemode
== 1) ||
5575 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
5576 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
5580 if (mddev_trylock(mddev
)) {
5583 spin_lock_irq(&mddev
->write_lock
);
5584 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
5585 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
5587 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5589 if (mddev
->safemode
== 1)
5590 mddev
->safemode
= 0;
5591 spin_unlock_irq(&mddev
->write_lock
);
5594 md_update_sb(mddev
, 0);
5597 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
5598 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
5599 /* resync/recovery still happening */
5600 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5603 if (mddev
->sync_thread
) {
5604 /* resync has finished, collect result */
5605 md_unregister_thread(mddev
->sync_thread
);
5606 mddev
->sync_thread
= NULL
;
5607 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5608 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5610 /* activate any spares */
5611 mddev
->pers
->spare_active(mddev
);
5613 md_update_sb(mddev
, 1);
5615 /* if array is no-longer degraded, then any saved_raid_disk
5616 * information must be scrapped
5618 if (!mddev
->degraded
)
5619 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5620 rdev
->saved_raid_disk
= -1;
5622 mddev
->recovery
= 0;
5623 /* flag recovery needed just to double check */
5624 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5625 md_new_event(mddev
);
5628 /* Clear some bits that don't mean anything, but
5631 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5632 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5633 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5634 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5636 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
5638 /* no recovery is running.
5639 * remove any failed drives, then
5640 * add spares if possible.
5641 * Spare are also removed and re-added, to allow
5642 * the personality to fail the re-add.
5645 if (mddev
->reshape_position
!= MaxSector
) {
5646 if (mddev
->pers
->check_reshape(mddev
) != 0)
5647 /* Cannot proceed */
5649 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
5650 } else if ((spares
= remove_and_add_spares(mddev
))) {
5651 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5652 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
5653 } else if (mddev
->recovery_cp
< MaxSector
) {
5654 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5655 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5656 /* nothing to be done ... */
5659 if (mddev
->pers
->sync_request
) {
5660 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
5661 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
5662 /* We are adding a device or devices to an array
5663 * which has the bitmap stored on all devices.
5664 * So make sure all bitmap pages get written
5666 bitmap_write_all(mddev
->bitmap
);
5668 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5671 if (!mddev
->sync_thread
) {
5672 printk(KERN_ERR
"%s: could not start resync"
5675 /* leave the spares where they are, it shouldn't hurt */
5676 mddev
->recovery
= 0;
5678 md_wakeup_thread(mddev
->sync_thread
);
5679 md_new_event(mddev
);
5682 mddev_unlock(mddev
);
5686 static int md_notify_reboot(struct notifier_block
*this,
5687 unsigned long code
, void *x
)
5689 struct list_head
*tmp
;
5692 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5694 printk(KERN_INFO
"md: stopping all md devices.\n");
5696 ITERATE_MDDEV(mddev
,tmp
)
5697 if (mddev_trylock(mddev
)) {
5698 do_md_stop (mddev
, 1);
5699 mddev_unlock(mddev
);
5702 * certain more exotic SCSI devices are known to be
5703 * volatile wrt too early system reboots. While the
5704 * right place to handle this issue is the given
5705 * driver, we do want to have a safe RAID driver ...
5712 static struct notifier_block md_notifier
= {
5713 .notifier_call
= md_notify_reboot
,
5715 .priority
= INT_MAX
, /* before any real devices */
5718 static void md_geninit(void)
5720 struct proc_dir_entry
*p
;
5722 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5724 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
5726 p
->proc_fops
= &md_seq_fops
;
5729 static int __init
md_init(void)
5731 if (register_blkdev(MAJOR_NR
, "md"))
5733 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5734 unregister_blkdev(MAJOR_NR
, "md");
5737 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5738 md_probe
, NULL
, NULL
);
5739 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5740 md_probe
, NULL
, NULL
);
5742 register_reboot_notifier(&md_notifier
);
5743 raid_table_header
= register_sysctl_table(raid_root_table
);
5753 * Searches all registered partitions for autorun RAID arrays
5756 static dev_t detected_devices
[128];
5759 void md_autodetect_dev(dev_t dev
)
5761 if (dev_cnt
>= 0 && dev_cnt
< 127)
5762 detected_devices
[dev_cnt
++] = dev
;
5766 static void autostart_arrays(int part
)
5771 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
5773 for (i
= 0; i
< dev_cnt
; i
++) {
5774 dev_t dev
= detected_devices
[i
];
5776 rdev
= md_import_device(dev
,0, 90);
5780 if (test_bit(Faulty
, &rdev
->flags
)) {
5784 list_add(&rdev
->same_set
, &pending_raid_disks
);
5788 autorun_devices(part
);
5791 #endif /* !MODULE */
5793 static __exit
void md_exit(void)
5796 struct list_head
*tmp
;
5798 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
5799 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
5801 unregister_blkdev(MAJOR_NR
,"md");
5802 unregister_blkdev(mdp_major
, "mdp");
5803 unregister_reboot_notifier(&md_notifier
);
5804 unregister_sysctl_table(raid_table_header
);
5805 remove_proc_entry("mdstat", NULL
);
5806 ITERATE_MDDEV(mddev
,tmp
) {
5807 struct gendisk
*disk
= mddev
->gendisk
;
5810 export_array(mddev
);
5813 mddev
->gendisk
= NULL
;
5818 subsys_initcall(md_init
);
5819 module_exit(md_exit
)
5821 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5823 return sprintf(buffer
, "%d", start_readonly
);
5825 static int set_ro(const char *val
, struct kernel_param
*kp
)
5828 int num
= simple_strtoul(val
, &e
, 10);
5829 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5830 start_readonly
= num
;
5836 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
5837 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
5840 EXPORT_SYMBOL(register_md_personality
);
5841 EXPORT_SYMBOL(unregister_md_personality
);
5842 EXPORT_SYMBOL(md_error
);
5843 EXPORT_SYMBOL(md_done_sync
);
5844 EXPORT_SYMBOL(md_write_start
);
5845 EXPORT_SYMBOL(md_write_end
);
5846 EXPORT_SYMBOL(md_register_thread
);
5847 EXPORT_SYMBOL(md_unregister_thread
);
5848 EXPORT_SYMBOL(md_wakeup_thread
);
5849 EXPORT_SYMBOL(md_check_recovery
);
5850 MODULE_LICENSE("GPL");
5852 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);