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/config.h>
37 #include <linux/linkage.h>
38 #include <linux/raid/md.h>
39 #include <linux/raid/bitmap.h>
40 #include <linux/sysctl.h>
41 #include <linux/devfs_fs_kernel.h>
42 #include <linux/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/suspend.h>
45 #include <linux/init.h>
47 #include <linux/file.h>
50 #include <linux/kmod.h>
53 #include <asm/unaligned.h>
55 #define MAJOR_NR MD_MAJOR
58 /* 63 partitions with the alternate major number (mdp) */
59 #define MdpMinorShift 6
62 #define dprintk(x...) ((void)(DEBUG && printk(x)))
66 static void autostart_arrays (int part
);
69 static mdk_personality_t
*pers
[MAX_PERSONALITY
];
70 static DEFINE_SPINLOCK(pers_lock
);
73 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
74 * is 1000 KB/sec, so the extra system load does not show up that much.
75 * Increase it if you want to have more _guaranteed_ speed. Note that
76 * the RAID driver will use the maximum available bandwith if the IO
77 * subsystem is idle. There is also an 'absolute maximum' reconstruction
78 * speed limit - in case reconstruction slows down your system despite
81 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
84 static int sysctl_speed_limit_min
= 1000;
85 static int sysctl_speed_limit_max
= 200000;
87 static struct ctl_table_header
*raid_table_header
;
89 static ctl_table raid_table
[] = {
91 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
92 .procname
= "speed_limit_min",
93 .data
= &sysctl_speed_limit_min
,
94 .maxlen
= sizeof(int),
96 .proc_handler
= &proc_dointvec
,
99 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
100 .procname
= "speed_limit_max",
101 .data
= &sysctl_speed_limit_max
,
102 .maxlen
= sizeof(int),
104 .proc_handler
= &proc_dointvec
,
109 static ctl_table raid_dir_table
[] = {
111 .ctl_name
= DEV_RAID
,
120 static ctl_table raid_root_table
[] = {
126 .child
= raid_dir_table
,
131 static struct block_device_operations md_fops
;
134 * Enables to iterate over all existing md arrays
135 * all_mddevs_lock protects this list.
137 static LIST_HEAD(all_mddevs
);
138 static DEFINE_SPINLOCK(all_mddevs_lock
);
142 * iterates through all used mddevs in the system.
143 * We take care to grab the all_mddevs_lock whenever navigating
144 * the list, and to always hold a refcount when unlocked.
145 * Any code which breaks out of this loop while own
146 * a reference to the current mddev and must mddev_put it.
148 #define ITERATE_MDDEV(mddev,tmp) \
150 for (({ spin_lock(&all_mddevs_lock); \
151 tmp = all_mddevs.next; \
153 ({ if (tmp != &all_mddevs) \
154 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
155 spin_unlock(&all_mddevs_lock); \
156 if (mddev) mddev_put(mddev); \
157 mddev = list_entry(tmp, mddev_t, all_mddevs); \
158 tmp != &all_mddevs;}); \
159 ({ spin_lock(&all_mddevs_lock); \
164 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
166 bio_io_error(bio
, bio
->bi_size
);
170 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
172 atomic_inc(&mddev
->active
);
176 static void mddev_put(mddev_t
*mddev
)
178 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
180 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
181 list_del(&mddev
->all_mddevs
);
182 blk_put_queue(mddev
->queue
);
185 spin_unlock(&all_mddevs_lock
);
188 static mddev_t
* mddev_find(dev_t unit
)
190 mddev_t
*mddev
, *new = NULL
;
193 spin_lock(&all_mddevs_lock
);
194 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
195 if (mddev
->unit
== unit
) {
197 spin_unlock(&all_mddevs_lock
);
203 list_add(&new->all_mddevs
, &all_mddevs
);
204 spin_unlock(&all_mddevs_lock
);
207 spin_unlock(&all_mddevs_lock
);
209 new = (mddev_t
*) kmalloc(sizeof(*new), GFP_KERNEL
);
213 memset(new, 0, sizeof(*new));
216 if (MAJOR(unit
) == MD_MAJOR
)
217 new->md_minor
= MINOR(unit
);
219 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
221 init_MUTEX(&new->reconfig_sem
);
222 INIT_LIST_HEAD(&new->disks
);
223 INIT_LIST_HEAD(&new->all_mddevs
);
224 init_timer(&new->safemode_timer
);
225 atomic_set(&new->active
, 1);
226 spin_lock_init(&new->write_lock
);
227 init_waitqueue_head(&new->sb_wait
);
229 new->queue
= blk_alloc_queue(GFP_KERNEL
);
235 blk_queue_make_request(new->queue
, md_fail_request
);
240 static inline int mddev_lock(mddev_t
* mddev
)
242 return down_interruptible(&mddev
->reconfig_sem
);
245 static inline void mddev_lock_uninterruptible(mddev_t
* mddev
)
247 down(&mddev
->reconfig_sem
);
250 static inline int mddev_trylock(mddev_t
* mddev
)
252 return down_trylock(&mddev
->reconfig_sem
);
255 static inline void mddev_unlock(mddev_t
* mddev
)
257 up(&mddev
->reconfig_sem
);
259 md_wakeup_thread(mddev
->thread
);
262 mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
265 struct list_head
*tmp
;
267 ITERATE_RDEV(mddev
,rdev
,tmp
) {
268 if (rdev
->desc_nr
== nr
)
274 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
276 struct list_head
*tmp
;
279 ITERATE_RDEV(mddev
,rdev
,tmp
) {
280 if (rdev
->bdev
->bd_dev
== dev
)
286 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
288 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
289 return MD_NEW_SIZE_BLOCKS(size
);
292 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
296 size
= rdev
->sb_offset
;
299 size
&= ~((sector_t
)chunk_size
/1024 - 1);
303 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
308 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
309 if (!rdev
->sb_page
) {
310 printk(KERN_ALERT
"md: out of memory.\n");
317 static void free_disk_sb(mdk_rdev_t
* rdev
)
320 page_cache_release(rdev
->sb_page
);
322 rdev
->sb_page
= NULL
;
329 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
331 mdk_rdev_t
*rdev
= bio
->bi_private
;
335 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
336 md_error(rdev
->mddev
, rdev
);
338 if (atomic_dec_and_test(&rdev
->mddev
->pending_writes
))
339 wake_up(&rdev
->mddev
->sb_wait
);
344 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
345 sector_t sector
, int size
, struct page
*page
)
347 /* write first size bytes of page to sector of rdev
348 * Increment mddev->pending_writes before returning
349 * and decrement it on completion, waking up sb_wait
350 * if zero is reached.
351 * If an error occurred, call md_error
353 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
355 bio
->bi_bdev
= rdev
->bdev
;
356 bio
->bi_sector
= sector
;
357 bio_add_page(bio
, page
, size
, 0);
358 bio
->bi_private
= rdev
;
359 bio
->bi_end_io
= super_written
;
360 atomic_inc(&mddev
->pending_writes
);
361 submit_bio((1<<BIO_RW
)|(1<<BIO_RW_SYNC
), bio
);
364 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
369 complete((struct completion
*)bio
->bi_private
);
373 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
374 struct page
*page
, int rw
)
376 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
377 struct completion event
;
380 rw
|= (1 << BIO_RW_SYNC
);
383 bio
->bi_sector
= sector
;
384 bio_add_page(bio
, page
, size
, 0);
385 init_completion(&event
);
386 bio
->bi_private
= &event
;
387 bio
->bi_end_io
= bi_complete
;
389 wait_for_completion(&event
);
391 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
396 static int read_disk_sb(mdk_rdev_t
* rdev
)
398 char b
[BDEVNAME_SIZE
];
399 if (!rdev
->sb_page
) {
407 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, MD_SB_BYTES
, rdev
->sb_page
, READ
))
413 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
414 bdevname(rdev
->bdev
,b
));
418 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
420 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
421 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
422 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
423 (sb1
->set_uuid3
== sb2
->set_uuid3
))
431 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
434 mdp_super_t
*tmp1
, *tmp2
;
436 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
437 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
439 if (!tmp1
|| !tmp2
) {
441 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
449 * nr_disks is not constant
454 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
465 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
467 unsigned int disk_csum
, csum
;
469 disk_csum
= sb
->sb_csum
;
471 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
472 sb
->sb_csum
= disk_csum
;
478 * Handle superblock details.
479 * We want to be able to handle multiple superblock formats
480 * so we have a common interface to them all, and an array of
481 * different handlers.
482 * We rely on user-space to write the initial superblock, and support
483 * reading and updating of superblocks.
484 * Interface methods are:
485 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
486 * loads and validates a superblock on dev.
487 * if refdev != NULL, compare superblocks on both devices
489 * 0 - dev has a superblock that is compatible with refdev
490 * 1 - dev has a superblock that is compatible and newer than refdev
491 * so dev should be used as the refdev in future
492 * -EINVAL superblock incompatible or invalid
493 * -othererror e.g. -EIO
495 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
496 * Verify that dev is acceptable into mddev.
497 * The first time, mddev->raid_disks will be 0, and data from
498 * dev should be merged in. Subsequent calls check that dev
499 * is new enough. Return 0 or -EINVAL
501 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
502 * Update the superblock for rdev with data in mddev
503 * This does not write to disc.
509 struct module
*owner
;
510 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
511 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
512 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
516 * load_super for 0.90.0
518 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
520 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
526 * Calculate the position of the superblock,
527 * it's at the end of the disk.
529 * It also happens to be a multiple of 4Kb.
531 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
532 rdev
->sb_offset
= sb_offset
;
534 ret
= read_disk_sb(rdev
);
539 bdevname(rdev
->bdev
, b
);
540 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
542 if (sb
->md_magic
!= MD_SB_MAGIC
) {
543 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
548 if (sb
->major_version
!= 0 ||
549 sb
->minor_version
!= 90) {
550 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
551 sb
->major_version
, sb
->minor_version
,
556 if (sb
->raid_disks
<= 0)
559 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
560 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
565 rdev
->preferred_minor
= sb
->md_minor
;
566 rdev
->data_offset
= 0;
568 if (sb
->level
== LEVEL_MULTIPATH
)
571 rdev
->desc_nr
= sb
->this_disk
.number
;
577 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
578 if (!uuid_equal(refsb
, sb
)) {
579 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
580 b
, bdevname(refdev
->bdev
,b2
));
583 if (!sb_equal(refsb
, sb
)) {
584 printk(KERN_WARNING
"md: %s has same UUID"
585 " but different superblock to %s\n",
586 b
, bdevname(refdev
->bdev
, b2
));
590 ev2
= md_event(refsb
);
596 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
603 * validate_super for 0.90.0
605 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
608 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
610 rdev
->raid_disk
= -1;
612 if (mddev
->raid_disks
== 0) {
613 mddev
->major_version
= 0;
614 mddev
->minor_version
= sb
->minor_version
;
615 mddev
->patch_version
= sb
->patch_version
;
616 mddev
->persistent
= ! sb
->not_persistent
;
617 mddev
->chunk_size
= sb
->chunk_size
;
618 mddev
->ctime
= sb
->ctime
;
619 mddev
->utime
= sb
->utime
;
620 mddev
->level
= sb
->level
;
621 mddev
->layout
= sb
->layout
;
622 mddev
->raid_disks
= sb
->raid_disks
;
623 mddev
->size
= sb
->size
;
624 mddev
->events
= md_event(sb
);
625 mddev
->bitmap_offset
= 0;
626 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
628 if (sb
->state
& (1<<MD_SB_CLEAN
))
629 mddev
->recovery_cp
= MaxSector
;
631 if (sb
->events_hi
== sb
->cp_events_hi
&&
632 sb
->events_lo
== sb
->cp_events_lo
) {
633 mddev
->recovery_cp
= sb
->recovery_cp
;
635 mddev
->recovery_cp
= 0;
638 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
639 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
640 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
641 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
643 mddev
->max_disks
= MD_SB_DISKS
;
645 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
646 mddev
->bitmap_file
== NULL
) {
647 if (mddev
->level
!= 1) {
648 /* FIXME use a better test */
649 printk(KERN_WARNING
"md: bitmaps only support for raid1\n");
652 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
655 } else if (mddev
->pers
== NULL
) {
656 /* Insist on good event counter while assembling */
657 __u64 ev1
= md_event(sb
);
659 if (ev1
< mddev
->events
)
661 } else if (mddev
->bitmap
) {
662 /* if adding to array with a bitmap, then we can accept an
663 * older device ... but not too old.
665 __u64 ev1
= md_event(sb
);
666 if (ev1
< mddev
->bitmap
->events_cleared
)
668 } else /* just a hot-add of a new device, leave raid_disk at -1 */
671 if (mddev
->level
!= LEVEL_MULTIPATH
) {
674 desc
= sb
->disks
+ rdev
->desc_nr
;
676 if (desc
->state
& (1<<MD_DISK_FAULTY
))
678 else if (desc
->state
& (1<<MD_DISK_SYNC
) &&
679 desc
->raid_disk
< mddev
->raid_disks
) {
681 rdev
->raid_disk
= desc
->raid_disk
;
683 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
684 set_bit(WriteMostly
, &rdev
->flags
);
685 } else /* MULTIPATH are always insync */
691 * sync_super for 0.90.0
693 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
696 struct list_head
*tmp
;
698 int next_spare
= mddev
->raid_disks
;
700 /* make rdev->sb match mddev data..
703 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
704 * 3/ any empty disks < next_spare become removed
706 * disks[0] gets initialised to REMOVED because
707 * we cannot be sure from other fields if it has
708 * been initialised or not.
711 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
713 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
715 memset(sb
, 0, sizeof(*sb
));
717 sb
->md_magic
= MD_SB_MAGIC
;
718 sb
->major_version
= mddev
->major_version
;
719 sb
->minor_version
= mddev
->minor_version
;
720 sb
->patch_version
= mddev
->patch_version
;
721 sb
->gvalid_words
= 0; /* ignored */
722 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
723 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
724 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
725 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
727 sb
->ctime
= mddev
->ctime
;
728 sb
->level
= mddev
->level
;
729 sb
->size
= mddev
->size
;
730 sb
->raid_disks
= mddev
->raid_disks
;
731 sb
->md_minor
= mddev
->md_minor
;
732 sb
->not_persistent
= !mddev
->persistent
;
733 sb
->utime
= mddev
->utime
;
735 sb
->events_hi
= (mddev
->events
>>32);
736 sb
->events_lo
= (u32
)mddev
->events
;
740 sb
->recovery_cp
= mddev
->recovery_cp
;
741 sb
->cp_events_hi
= (mddev
->events
>>32);
742 sb
->cp_events_lo
= (u32
)mddev
->events
;
743 if (mddev
->recovery_cp
== MaxSector
)
744 sb
->state
= (1<< MD_SB_CLEAN
);
748 sb
->layout
= mddev
->layout
;
749 sb
->chunk_size
= mddev
->chunk_size
;
751 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
752 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
754 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
755 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
757 if (rdev2
->raid_disk
>= 0 && rdev2
->in_sync
&& !rdev2
->faulty
)
758 rdev2
->desc_nr
= rdev2
->raid_disk
;
760 rdev2
->desc_nr
= next_spare
++;
761 d
= &sb
->disks
[rdev2
->desc_nr
];
763 d
->number
= rdev2
->desc_nr
;
764 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
765 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
766 if (rdev2
->raid_disk
>= 0 && rdev
->in_sync
&& !rdev2
->faulty
)
767 d
->raid_disk
= rdev2
->raid_disk
;
769 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
771 d
->state
= (1<<MD_DISK_FAULTY
);
773 } else if (rdev2
->in_sync
) {
774 d
->state
= (1<<MD_DISK_ACTIVE
);
775 d
->state
|= (1<<MD_DISK_SYNC
);
783 if (test_bit(WriteMostly
, &rdev2
->flags
))
784 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
787 /* now set the "removed" and "faulty" bits on any missing devices */
788 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
789 mdp_disk_t
*d
= &sb
->disks
[i
];
790 if (d
->state
== 0 && d
->number
== 0) {
793 d
->state
= (1<<MD_DISK_REMOVED
);
794 d
->state
|= (1<<MD_DISK_FAULTY
);
798 sb
->nr_disks
= nr_disks
;
799 sb
->active_disks
= active
;
800 sb
->working_disks
= working
;
801 sb
->failed_disks
= failed
;
802 sb
->spare_disks
= spare
;
804 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
805 sb
->sb_csum
= calc_sb_csum(sb
);
809 * version 1 superblock
812 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
814 unsigned int disk_csum
, csum
;
815 unsigned long long newcsum
;
816 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
817 unsigned int *isuper
= (unsigned int*)sb
;
820 disk_csum
= sb
->sb_csum
;
823 for (i
=0; size
>=4; size
-= 4 )
824 newcsum
+= le32_to_cpu(*isuper
++);
827 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
829 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
830 sb
->sb_csum
= disk_csum
;
831 return cpu_to_le32(csum
);
834 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
836 struct mdp_superblock_1
*sb
;
839 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
842 * Calculate the position of the superblock.
843 * It is always aligned to a 4K boundary and
844 * depeding on minor_version, it can be:
845 * 0: At least 8K, but less than 12K, from end of device
846 * 1: At start of device
847 * 2: 4K from start of device.
849 switch(minor_version
) {
851 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
853 sb_offset
&= ~(sector_t
)(4*2-1);
854 /* convert from sectors to K */
866 rdev
->sb_offset
= sb_offset
;
868 ret
= read_disk_sb(rdev
);
872 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
874 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
875 sb
->major_version
!= cpu_to_le32(1) ||
876 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
877 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
878 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
881 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
882 printk("md: invalid superblock checksum on %s\n",
883 bdevname(rdev
->bdev
,b
));
886 if (le64_to_cpu(sb
->data_size
) < 10) {
887 printk("md: data_size too small on %s\n",
888 bdevname(rdev
->bdev
,b
));
891 rdev
->preferred_minor
= 0xffff;
892 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
898 struct mdp_superblock_1
*refsb
=
899 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
901 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
902 sb
->level
!= refsb
->level
||
903 sb
->layout
!= refsb
->layout
||
904 sb
->chunksize
!= refsb
->chunksize
) {
905 printk(KERN_WARNING
"md: %s has strangely different"
906 " superblock to %s\n",
907 bdevname(rdev
->bdev
,b
),
908 bdevname(refdev
->bdev
,b2
));
911 ev1
= le64_to_cpu(sb
->events
);
912 ev2
= le64_to_cpu(refsb
->events
);
918 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
920 rdev
->size
= rdev
->sb_offset
;
921 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
923 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
924 if (le32_to_cpu(sb
->chunksize
))
925 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
929 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
931 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
933 rdev
->raid_disk
= -1;
935 if (mddev
->raid_disks
== 0) {
936 mddev
->major_version
= 1;
937 mddev
->patch_version
= 0;
938 mddev
->persistent
= 1;
939 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
940 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
941 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
942 mddev
->level
= le32_to_cpu(sb
->level
);
943 mddev
->layout
= le32_to_cpu(sb
->layout
);
944 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
945 mddev
->size
= le64_to_cpu(sb
->size
)/2;
946 mddev
->events
= le64_to_cpu(sb
->events
);
947 mddev
->bitmap_offset
= 0;
948 mddev
->default_bitmap_offset
= 0;
949 if (mddev
->minor_version
== 0)
950 mddev
->default_bitmap_offset
= -(64*1024)/512;
952 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
953 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
955 mddev
->max_disks
= (4096-256)/2;
957 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
958 mddev
->bitmap_file
== NULL
) {
959 if (mddev
->level
!= 1) {
960 printk(KERN_WARNING
"md: bitmaps only supported for raid1\n");
963 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
965 } else if (mddev
->pers
== NULL
) {
966 /* Insist of good event counter while assembling */
967 __u64 ev1
= le64_to_cpu(sb
->events
);
969 if (ev1
< mddev
->events
)
971 } else if (mddev
->bitmap
) {
972 /* If adding to array with a bitmap, then we can accept an
973 * older device, but not too old.
975 __u64 ev1
= le64_to_cpu(sb
->events
);
976 if (ev1
< mddev
->bitmap
->events_cleared
)
978 } else /* just a hot-add of a new device, leave raid_disk at -1 */
981 if (mddev
->level
!= LEVEL_MULTIPATH
) {
983 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
984 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
986 case 0xffff: /* spare */
989 case 0xfffe: /* faulty */
995 rdev
->raid_disk
= role
;
999 if (sb
->devflags
& WriteMostly1
)
1000 set_bit(WriteMostly
, &rdev
->flags
);
1001 } else /* MULTIPATH are always insync */
1007 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1009 struct mdp_superblock_1
*sb
;
1010 struct list_head
*tmp
;
1013 /* make rdev->sb match mddev and rdev data. */
1015 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1017 sb
->feature_map
= 0;
1019 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1020 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1021 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1023 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1024 sb
->events
= cpu_to_le64(mddev
->events
);
1026 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1028 sb
->resync_offset
= cpu_to_le64(0);
1030 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1031 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1032 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1036 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1037 if (rdev2
->desc_nr
+1 > max_dev
)
1038 max_dev
= rdev2
->desc_nr
+1;
1040 sb
->max_dev
= cpu_to_le32(max_dev
);
1041 for (i
=0; i
<max_dev
;i
++)
1042 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1044 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1047 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1048 else if (rdev2
->in_sync
)
1049 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1051 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1054 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1055 sb
->sb_csum
= calc_sb_1_csum(sb
);
1059 static struct super_type super_types
[] = {
1062 .owner
= THIS_MODULE
,
1063 .load_super
= super_90_load
,
1064 .validate_super
= super_90_validate
,
1065 .sync_super
= super_90_sync
,
1069 .owner
= THIS_MODULE
,
1070 .load_super
= super_1_load
,
1071 .validate_super
= super_1_validate
,
1072 .sync_super
= super_1_sync
,
1076 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1078 struct list_head
*tmp
;
1081 ITERATE_RDEV(mddev
,rdev
,tmp
)
1082 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1088 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1090 struct list_head
*tmp
;
1093 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1094 if (match_dev_unit(mddev2
, rdev
))
1100 static LIST_HEAD(pending_raid_disks
);
1102 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1104 mdk_rdev_t
*same_pdev
;
1105 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1111 same_pdev
= match_dev_unit(mddev
, rdev
);
1114 "%s: WARNING: %s appears to be on the same physical"
1115 " disk as %s. True\n protection against single-disk"
1116 " failure might be compromised.\n",
1117 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1118 bdevname(same_pdev
->bdev
,b2
));
1120 /* Verify rdev->desc_nr is unique.
1121 * If it is -1, assign a free number, else
1122 * check number is not in use
1124 if (rdev
->desc_nr
< 0) {
1126 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1127 while (find_rdev_nr(mddev
, choice
))
1129 rdev
->desc_nr
= choice
;
1131 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1135 list_add(&rdev
->same_set
, &mddev
->disks
);
1136 rdev
->mddev
= mddev
;
1137 printk(KERN_INFO
"md: bind<%s>\n", bdevname(rdev
->bdev
,b
));
1141 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1143 char b
[BDEVNAME_SIZE
];
1148 list_del_init(&rdev
->same_set
);
1149 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1154 * prevent the device from being mounted, repartitioned or
1155 * otherwise reused by a RAID array (or any other kernel
1156 * subsystem), by bd_claiming the device.
1158 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1161 struct block_device
*bdev
;
1162 char b
[BDEVNAME_SIZE
];
1164 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1166 printk(KERN_ERR
"md: could not open %s.\n",
1167 __bdevname(dev
, b
));
1168 return PTR_ERR(bdev
);
1170 err
= bd_claim(bdev
, rdev
);
1172 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1181 static void unlock_rdev(mdk_rdev_t
*rdev
)
1183 struct block_device
*bdev
= rdev
->bdev
;
1191 void md_autodetect_dev(dev_t dev
);
1193 static void export_rdev(mdk_rdev_t
* rdev
)
1195 char b
[BDEVNAME_SIZE
];
1196 printk(KERN_INFO
"md: export_rdev(%s)\n",
1197 bdevname(rdev
->bdev
,b
));
1201 list_del_init(&rdev
->same_set
);
1203 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1209 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1211 unbind_rdev_from_array(rdev
);
1215 static void export_array(mddev_t
*mddev
)
1217 struct list_head
*tmp
;
1220 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1225 kick_rdev_from_array(rdev
);
1227 if (!list_empty(&mddev
->disks
))
1229 mddev
->raid_disks
= 0;
1230 mddev
->major_version
= 0;
1233 static void print_desc(mdp_disk_t
*desc
)
1235 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1236 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1239 static void print_sb(mdp_super_t
*sb
)
1244 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1245 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1246 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1248 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1249 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1250 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1251 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1252 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1253 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1254 sb
->failed_disks
, sb
->spare_disks
,
1255 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1258 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1261 desc
= sb
->disks
+ i
;
1262 if (desc
->number
|| desc
->major
|| desc
->minor
||
1263 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1264 printk(" D %2d: ", i
);
1268 printk(KERN_INFO
"md: THIS: ");
1269 print_desc(&sb
->this_disk
);
1273 static void print_rdev(mdk_rdev_t
*rdev
)
1275 char b
[BDEVNAME_SIZE
];
1276 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1277 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1278 rdev
->faulty
, rdev
->in_sync
, rdev
->desc_nr
);
1279 if (rdev
->sb_loaded
) {
1280 printk(KERN_INFO
"md: rdev superblock:\n");
1281 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1283 printk(KERN_INFO
"md: no rdev superblock!\n");
1286 void md_print_devices(void)
1288 struct list_head
*tmp
, *tmp2
;
1291 char b
[BDEVNAME_SIZE
];
1294 printk("md: **********************************\n");
1295 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1296 printk("md: **********************************\n");
1297 ITERATE_MDDEV(mddev
,tmp
) {
1300 bitmap_print_sb(mddev
->bitmap
);
1302 printk("%s: ", mdname(mddev
));
1303 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1304 printk("<%s>", bdevname(rdev
->bdev
,b
));
1307 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1310 printk("md: **********************************\n");
1315 static void sync_sbs(mddev_t
* mddev
)
1318 struct list_head
*tmp
;
1320 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1321 super_types
[mddev
->major_version
].
1322 sync_super(mddev
, rdev
);
1323 rdev
->sb_loaded
= 1;
1327 static void md_update_sb(mddev_t
* mddev
)
1330 struct list_head
*tmp
;
1335 spin_lock(&mddev
->write_lock
);
1336 sync_req
= mddev
->in_sync
;
1337 mddev
->utime
= get_seconds();
1340 if (!mddev
->events
) {
1342 * oops, this 64-bit counter should never wrap.
1343 * Either we are in around ~1 trillion A.C., assuming
1344 * 1 reboot per second, or we have a bug:
1349 mddev
->sb_dirty
= 2;
1353 * do not write anything to disk if using
1354 * nonpersistent superblocks
1356 if (!mddev
->persistent
) {
1357 mddev
->sb_dirty
= 0;
1358 spin_unlock(&mddev
->write_lock
);
1359 wake_up(&mddev
->sb_wait
);
1362 spin_unlock(&mddev
->write_lock
);
1365 "md: updating %s RAID superblock on device (in sync %d)\n",
1366 mdname(mddev
),mddev
->in_sync
);
1368 err
= bitmap_update_sb(mddev
->bitmap
);
1369 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1370 char b
[BDEVNAME_SIZE
];
1371 dprintk(KERN_INFO
"md: ");
1373 dprintk("(skipping faulty ");
1375 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1376 if (!rdev
->faulty
) {
1377 md_super_write(mddev
,rdev
,
1378 rdev
->sb_offset
<<1, MD_SB_BYTES
,
1380 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1381 bdevname(rdev
->bdev
,b
),
1382 (unsigned long long)rdev
->sb_offset
);
1386 if (mddev
->level
== LEVEL_MULTIPATH
)
1387 /* only need to write one superblock... */
1390 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
1391 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1393 spin_lock(&mddev
->write_lock
);
1394 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1395 /* have to write it out again */
1396 spin_unlock(&mddev
->write_lock
);
1399 mddev
->sb_dirty
= 0;
1400 spin_unlock(&mddev
->write_lock
);
1401 wake_up(&mddev
->sb_wait
);
1406 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1408 * mark the device faulty if:
1410 * - the device is nonexistent (zero size)
1411 * - the device has no valid superblock
1413 * a faulty rdev _never_ has rdev->sb set.
1415 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1417 char b
[BDEVNAME_SIZE
];
1422 rdev
= (mdk_rdev_t
*) kmalloc(sizeof(*rdev
), GFP_KERNEL
);
1424 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1425 return ERR_PTR(-ENOMEM
);
1427 memset(rdev
, 0, sizeof(*rdev
));
1429 if ((err
= alloc_disk_sb(rdev
)))
1432 err
= lock_rdev(rdev
, newdev
);
1439 rdev
->data_offset
= 0;
1440 atomic_set(&rdev
->nr_pending
, 0);
1442 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1445 "md: %s has zero or unknown size, marking faulty!\n",
1446 bdevname(rdev
->bdev
,b
));
1451 if (super_format
>= 0) {
1452 err
= super_types
[super_format
].
1453 load_super(rdev
, NULL
, super_minor
);
1454 if (err
== -EINVAL
) {
1456 "md: %s has invalid sb, not importing!\n",
1457 bdevname(rdev
->bdev
,b
));
1462 "md: could not read %s's sb, not importing!\n",
1463 bdevname(rdev
->bdev
,b
));
1467 INIT_LIST_HEAD(&rdev
->same_set
);
1472 if (rdev
->sb_page
) {
1478 return ERR_PTR(err
);
1482 * Check a full RAID array for plausibility
1486 static void analyze_sbs(mddev_t
* mddev
)
1489 struct list_head
*tmp
;
1490 mdk_rdev_t
*rdev
, *freshest
;
1491 char b
[BDEVNAME_SIZE
];
1494 ITERATE_RDEV(mddev
,rdev
,tmp
)
1495 switch (super_types
[mddev
->major_version
].
1496 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1504 "md: fatal superblock inconsistency in %s"
1505 " -- removing from array\n",
1506 bdevname(rdev
->bdev
,b
));
1507 kick_rdev_from_array(rdev
);
1511 super_types
[mddev
->major_version
].
1512 validate_super(mddev
, freshest
);
1515 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1516 if (rdev
!= freshest
)
1517 if (super_types
[mddev
->major_version
].
1518 validate_super(mddev
, rdev
)) {
1519 printk(KERN_WARNING
"md: kicking non-fresh %s"
1521 bdevname(rdev
->bdev
,b
));
1522 kick_rdev_from_array(rdev
);
1525 if (mddev
->level
== LEVEL_MULTIPATH
) {
1526 rdev
->desc_nr
= i
++;
1527 rdev
->raid_disk
= rdev
->desc_nr
;
1534 if (mddev
->recovery_cp
!= MaxSector
&&
1536 printk(KERN_ERR
"md: %s: raid array is not clean"
1537 " -- starting background reconstruction\n",
1544 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
1546 static DECLARE_MUTEX(disks_sem
);
1547 mddev_t
*mddev
= mddev_find(dev
);
1548 struct gendisk
*disk
;
1549 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
1550 int shift
= partitioned
? MdpMinorShift
: 0;
1551 int unit
= MINOR(dev
) >> shift
;
1557 if (mddev
->gendisk
) {
1562 disk
= alloc_disk(1 << shift
);
1568 disk
->major
= MAJOR(dev
);
1569 disk
->first_minor
= unit
<< shift
;
1571 sprintf(disk
->disk_name
, "md_d%d", unit
);
1572 sprintf(disk
->devfs_name
, "md/d%d", unit
);
1574 sprintf(disk
->disk_name
, "md%d", unit
);
1575 sprintf(disk
->devfs_name
, "md/%d", unit
);
1577 disk
->fops
= &md_fops
;
1578 disk
->private_data
= mddev
;
1579 disk
->queue
= mddev
->queue
;
1581 mddev
->gendisk
= disk
;
1586 void md_wakeup_thread(mdk_thread_t
*thread
);
1588 static void md_safemode_timeout(unsigned long data
)
1590 mddev_t
*mddev
= (mddev_t
*) data
;
1592 mddev
->safemode
= 1;
1593 md_wakeup_thread(mddev
->thread
);
1597 static int do_md_run(mddev_t
* mddev
)
1601 struct list_head
*tmp
;
1603 struct gendisk
*disk
;
1604 char b
[BDEVNAME_SIZE
];
1606 if (list_empty(&mddev
->disks
))
1607 /* cannot run an array with no devices.. */
1614 * Analyze all RAID superblock(s)
1616 if (!mddev
->raid_disks
)
1619 chunk_size
= mddev
->chunk_size
;
1620 pnum
= level_to_pers(mddev
->level
);
1622 if ((pnum
!= MULTIPATH
) && (pnum
!= RAID1
)) {
1625 * 'default chunksize' in the old md code used to
1626 * be PAGE_SIZE, baaad.
1627 * we abort here to be on the safe side. We don't
1628 * want to continue the bad practice.
1631 "no chunksize specified, see 'man raidtab'\n");
1634 if (chunk_size
> MAX_CHUNK_SIZE
) {
1635 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
1636 chunk_size
, MAX_CHUNK_SIZE
);
1640 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1642 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
1643 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
1646 if (chunk_size
< PAGE_SIZE
) {
1647 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
1648 chunk_size
, PAGE_SIZE
);
1652 /* devices must have minimum size of one chunk */
1653 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1656 if (rdev
->size
< chunk_size
/ 1024) {
1658 "md: Dev %s smaller than chunk_size:"
1660 bdevname(rdev
->bdev
,b
),
1661 (unsigned long long)rdev
->size
,
1671 request_module("md-personality-%d", pnum
);
1676 * Drop all container device buffers, from now on
1677 * the only valid external interface is through the md
1679 * Also find largest hardsector size
1681 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1684 sync_blockdev(rdev
->bdev
);
1685 invalidate_bdev(rdev
->bdev
, 0);
1688 md_probe(mddev
->unit
, NULL
, NULL
);
1689 disk
= mddev
->gendisk
;
1693 spin_lock(&pers_lock
);
1694 if (!pers
[pnum
] || !try_module_get(pers
[pnum
]->owner
)) {
1695 spin_unlock(&pers_lock
);
1696 printk(KERN_WARNING
"md: personality %d is not loaded!\n",
1701 mddev
->pers
= pers
[pnum
];
1702 spin_unlock(&pers_lock
);
1704 mddev
->recovery
= 0;
1705 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
1707 /* before we start the array running, initialise the bitmap */
1708 err
= bitmap_create(mddev
);
1710 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
1711 mdname(mddev
), err
);
1713 err
= mddev
->pers
->run(mddev
);
1715 printk(KERN_ERR
"md: pers->run() failed ...\n");
1716 module_put(mddev
->pers
->owner
);
1718 bitmap_destroy(mddev
);
1721 atomic_set(&mddev
->writes_pending
,0);
1722 mddev
->safemode
= 0;
1723 mddev
->safemode_timer
.function
= md_safemode_timeout
;
1724 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
1725 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
1728 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
1729 md_wakeup_thread(mddev
->thread
);
1731 if (mddev
->sb_dirty
)
1732 md_update_sb(mddev
);
1734 set_capacity(disk
, mddev
->array_size
<<1);
1736 /* If we call blk_queue_make_request here, it will
1737 * re-initialise max_sectors etc which may have been
1738 * refined inside -> run. So just set the bits we need to set.
1739 * Most initialisation happended when we called
1740 * blk_queue_make_request(..., md_fail_request)
1743 mddev
->queue
->queuedata
= mddev
;
1744 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
1750 static int restart_array(mddev_t
*mddev
)
1752 struct gendisk
*disk
= mddev
->gendisk
;
1756 * Complain if it has no devices
1759 if (list_empty(&mddev
->disks
))
1767 mddev
->safemode
= 0;
1769 set_disk_ro(disk
, 0);
1771 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
1774 * Kick recovery or resync if necessary
1776 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
1777 md_wakeup_thread(mddev
->thread
);
1780 printk(KERN_ERR
"md: %s has no personality assigned.\n",
1789 static int do_md_stop(mddev_t
* mddev
, int ro
)
1792 struct gendisk
*disk
= mddev
->gendisk
;
1795 if (atomic_read(&mddev
->active
)>2) {
1796 printk("md: %s still in use.\n",mdname(mddev
));
1800 if (mddev
->sync_thread
) {
1801 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
1802 md_unregister_thread(mddev
->sync_thread
);
1803 mddev
->sync_thread
= NULL
;
1806 del_timer_sync(&mddev
->safemode_timer
);
1808 invalidate_partition(disk
, 0);
1816 bitmap_flush(mddev
);
1817 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
1819 set_disk_ro(disk
, 0);
1820 blk_queue_make_request(mddev
->queue
, md_fail_request
);
1821 mddev
->pers
->stop(mddev
);
1822 module_put(mddev
->pers
->owner
);
1827 if (!mddev
->in_sync
) {
1828 /* mark array as shutdown cleanly */
1830 md_update_sb(mddev
);
1833 set_disk_ro(disk
, 1);
1836 bitmap_destroy(mddev
);
1837 if (mddev
->bitmap_file
) {
1838 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
1839 fput(mddev
->bitmap_file
);
1840 mddev
->bitmap_file
= NULL
;
1842 mddev
->bitmap_offset
= 0;
1845 * Free resources if final stop
1848 struct gendisk
*disk
;
1849 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
1851 export_array(mddev
);
1853 mddev
->array_size
= 0;
1854 disk
= mddev
->gendisk
;
1856 set_capacity(disk
, 0);
1859 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
1866 static void autorun_array(mddev_t
*mddev
)
1869 struct list_head
*tmp
;
1872 if (list_empty(&mddev
->disks
))
1875 printk(KERN_INFO
"md: running: ");
1877 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1878 char b
[BDEVNAME_SIZE
];
1879 printk("<%s>", bdevname(rdev
->bdev
,b
));
1883 err
= do_md_run (mddev
);
1885 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
1886 do_md_stop (mddev
, 0);
1891 * lets try to run arrays based on all disks that have arrived
1892 * until now. (those are in pending_raid_disks)
1894 * the method: pick the first pending disk, collect all disks with
1895 * the same UUID, remove all from the pending list and put them into
1896 * the 'same_array' list. Then order this list based on superblock
1897 * update time (freshest comes first), kick out 'old' disks and
1898 * compare superblocks. If everything's fine then run it.
1900 * If "unit" is allocated, then bump its reference count
1902 static void autorun_devices(int part
)
1904 struct list_head candidates
;
1905 struct list_head
*tmp
;
1906 mdk_rdev_t
*rdev0
, *rdev
;
1908 char b
[BDEVNAME_SIZE
];
1910 printk(KERN_INFO
"md: autorun ...\n");
1911 while (!list_empty(&pending_raid_disks
)) {
1913 rdev0
= list_entry(pending_raid_disks
.next
,
1914 mdk_rdev_t
, same_set
);
1916 printk(KERN_INFO
"md: considering %s ...\n",
1917 bdevname(rdev0
->bdev
,b
));
1918 INIT_LIST_HEAD(&candidates
);
1919 ITERATE_RDEV_PENDING(rdev
,tmp
)
1920 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
1921 printk(KERN_INFO
"md: adding %s ...\n",
1922 bdevname(rdev
->bdev
,b
));
1923 list_move(&rdev
->same_set
, &candidates
);
1926 * now we have a set of devices, with all of them having
1927 * mostly sane superblocks. It's time to allocate the
1930 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
1931 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
1932 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
1936 dev
= MKDEV(mdp_major
,
1937 rdev0
->preferred_minor
<< MdpMinorShift
);
1939 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
1941 md_probe(dev
, NULL
, NULL
);
1942 mddev
= mddev_find(dev
);
1945 "md: cannot allocate memory for md drive.\n");
1948 if (mddev_lock(mddev
))
1949 printk(KERN_WARNING
"md: %s locked, cannot run\n",
1951 else if (mddev
->raid_disks
|| mddev
->major_version
1952 || !list_empty(&mddev
->disks
)) {
1954 "md: %s already running, cannot run %s\n",
1955 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
1956 mddev_unlock(mddev
);
1958 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
1959 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
1960 list_del_init(&rdev
->same_set
);
1961 if (bind_rdev_to_array(rdev
, mddev
))
1964 autorun_array(mddev
);
1965 mddev_unlock(mddev
);
1967 /* on success, candidates will be empty, on error
1970 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
1974 printk(KERN_INFO
"md: ... autorun DONE.\n");
1978 * import RAID devices based on one partition
1979 * if possible, the array gets run as well.
1982 static int autostart_array(dev_t startdev
)
1984 char b
[BDEVNAME_SIZE
];
1985 int err
= -EINVAL
, i
;
1986 mdp_super_t
*sb
= NULL
;
1987 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
1989 start_rdev
= md_import_device(startdev
, 0, 0);
1990 if (IS_ERR(start_rdev
))
1994 /* NOTE: this can only work for 0.90.0 superblocks */
1995 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
1996 if (sb
->major_version
!= 0 ||
1997 sb
->minor_version
!= 90 ) {
1998 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
1999 export_rdev(start_rdev
);
2003 if (start_rdev
->faulty
) {
2005 "md: can not autostart based on faulty %s!\n",
2006 bdevname(start_rdev
->bdev
,b
));
2007 export_rdev(start_rdev
);
2010 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
2012 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2013 mdp_disk_t
*desc
= sb
->disks
+ i
;
2014 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
2018 if (dev
== startdev
)
2020 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
2022 rdev
= md_import_device(dev
, 0, 0);
2026 list_add(&rdev
->same_set
, &pending_raid_disks
);
2030 * possibly return codes
2038 static int get_version(void __user
* arg
)
2042 ver
.major
= MD_MAJOR_VERSION
;
2043 ver
.minor
= MD_MINOR_VERSION
;
2044 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
2046 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
2052 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
2054 mdu_array_info_t info
;
2055 int nr
,working
,active
,failed
,spare
;
2057 struct list_head
*tmp
;
2059 nr
=working
=active
=failed
=spare
=0;
2060 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2073 info
.major_version
= mddev
->major_version
;
2074 info
.minor_version
= mddev
->minor_version
;
2075 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
2076 info
.ctime
= mddev
->ctime
;
2077 info
.level
= mddev
->level
;
2078 info
.size
= mddev
->size
;
2080 info
.raid_disks
= mddev
->raid_disks
;
2081 info
.md_minor
= mddev
->md_minor
;
2082 info
.not_persistent
= !mddev
->persistent
;
2084 info
.utime
= mddev
->utime
;
2087 info
.state
= (1<<MD_SB_CLEAN
);
2088 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2089 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
2090 info
.active_disks
= active
;
2091 info
.working_disks
= working
;
2092 info
.failed_disks
= failed
;
2093 info
.spare_disks
= spare
;
2095 info
.layout
= mddev
->layout
;
2096 info
.chunk_size
= mddev
->chunk_size
;
2098 if (copy_to_user(arg
, &info
, sizeof(info
)))
2104 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
2106 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
2107 char *ptr
, *buf
= NULL
;
2110 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
2114 /* bitmap disabled, zero the first byte and copy out */
2115 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
2116 file
->pathname
[0] = '\0';
2120 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
2124 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
2128 strcpy(file
->pathname
, ptr
);
2132 if (copy_to_user(arg
, file
, sizeof(*file
)))
2140 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
2142 mdu_disk_info_t info
;
2146 if (copy_from_user(&info
, arg
, sizeof(info
)))
2151 rdev
= find_rdev_nr(mddev
, nr
);
2153 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
2154 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
2155 info
.raid_disk
= rdev
->raid_disk
;
2158 info
.state
|= (1<<MD_DISK_FAULTY
);
2159 else if (rdev
->in_sync
) {
2160 info
.state
|= (1<<MD_DISK_ACTIVE
);
2161 info
.state
|= (1<<MD_DISK_SYNC
);
2163 if (test_bit(WriteMostly
, &rdev
->flags
))
2164 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
2166 info
.major
= info
.minor
= 0;
2167 info
.raid_disk
= -1;
2168 info
.state
= (1<<MD_DISK_REMOVED
);
2171 if (copy_to_user(arg
, &info
, sizeof(info
)))
2177 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
2179 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
2181 dev_t dev
= MKDEV(info
->major
,info
->minor
);
2183 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
2186 if (!mddev
->raid_disks
) {
2188 /* expecting a device which has a superblock */
2189 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
2192 "md: md_import_device returned %ld\n",
2194 return PTR_ERR(rdev
);
2196 if (!list_empty(&mddev
->disks
)) {
2197 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2198 mdk_rdev_t
, same_set
);
2199 int err
= super_types
[mddev
->major_version
]
2200 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2203 "md: %s has different UUID to %s\n",
2204 bdevname(rdev
->bdev
,b
),
2205 bdevname(rdev0
->bdev
,b2
));
2210 err
= bind_rdev_to_array(rdev
, mddev
);
2217 * add_new_disk can be used once the array is assembled
2218 * to add "hot spares". They must already have a superblock
2223 if (!mddev
->pers
->hot_add_disk
) {
2225 "%s: personality does not support diskops!\n",
2229 if (mddev
->persistent
)
2230 rdev
= md_import_device(dev
, mddev
->major_version
,
2231 mddev
->minor_version
);
2233 rdev
= md_import_device(dev
, -1, -1);
2236 "md: md_import_device returned %ld\n",
2238 return PTR_ERR(rdev
);
2240 /* set save_raid_disk if appropriate */
2241 if (!mddev
->persistent
) {
2242 if (info
->state
& (1<<MD_DISK_SYNC
) &&
2243 info
->raid_disk
< mddev
->raid_disks
)
2244 rdev
->raid_disk
= info
->raid_disk
;
2246 rdev
->raid_disk
= -1;
2248 super_types
[mddev
->major_version
].
2249 validate_super(mddev
, rdev
);
2250 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2252 rdev
->in_sync
= 0; /* just to be sure */
2253 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2254 set_bit(WriteMostly
, &rdev
->flags
);
2256 rdev
->raid_disk
= -1;
2257 err
= bind_rdev_to_array(rdev
, mddev
);
2261 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2262 md_wakeup_thread(mddev
->thread
);
2266 /* otherwise, add_new_disk is only allowed
2267 * for major_version==0 superblocks
2269 if (mddev
->major_version
!= 0) {
2270 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
2275 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
2277 rdev
= md_import_device (dev
, -1, 0);
2280 "md: error, md_import_device() returned %ld\n",
2282 return PTR_ERR(rdev
);
2284 rdev
->desc_nr
= info
->number
;
2285 if (info
->raid_disk
< mddev
->raid_disks
)
2286 rdev
->raid_disk
= info
->raid_disk
;
2288 rdev
->raid_disk
= -1;
2291 if (rdev
->raid_disk
< mddev
->raid_disks
)
2292 rdev
->in_sync
= (info
->state
& (1<<MD_DISK_SYNC
));
2296 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2297 set_bit(WriteMostly
, &rdev
->flags
);
2299 err
= bind_rdev_to_array(rdev
, mddev
);
2305 if (!mddev
->persistent
) {
2306 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
2307 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2309 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2310 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2312 if (!mddev
->size
|| (mddev
->size
> rdev
->size
))
2313 mddev
->size
= rdev
->size
;
2319 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
2321 char b
[BDEVNAME_SIZE
];
2327 rdev
= find_rdev(mddev
, dev
);
2331 if (rdev
->raid_disk
>= 0)
2334 kick_rdev_from_array(rdev
);
2335 md_update_sb(mddev
);
2339 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
2340 bdevname(rdev
->bdev
,b
), mdname(mddev
));
2344 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
2346 char b
[BDEVNAME_SIZE
];
2354 if (mddev
->major_version
!= 0) {
2355 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
2356 " version-0 superblocks.\n",
2360 if (!mddev
->pers
->hot_add_disk
) {
2362 "%s: personality does not support diskops!\n",
2367 rdev
= md_import_device (dev
, -1, 0);
2370 "md: error, md_import_device() returned %ld\n",
2375 if (mddev
->persistent
)
2376 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2379 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2381 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2384 if (size
< mddev
->size
) {
2386 "%s: disk size %llu blocks < array size %llu\n",
2387 mdname(mddev
), (unsigned long long)size
,
2388 (unsigned long long)mddev
->size
);
2395 "md: can not hot-add faulty %s disk to %s!\n",
2396 bdevname(rdev
->bdev
,b
), mdname(mddev
));
2402 bind_rdev_to_array(rdev
, mddev
);
2405 * The rest should better be atomic, we can have disk failures
2406 * noticed in interrupt contexts ...
2409 if (rdev
->desc_nr
== mddev
->max_disks
) {
2410 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
2413 goto abort_unbind_export
;
2416 rdev
->raid_disk
= -1;
2418 md_update_sb(mddev
);
2421 * Kick recovery, maybe this spare has to be added to the
2422 * array immediately.
2424 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2425 md_wakeup_thread(mddev
->thread
);
2429 abort_unbind_export
:
2430 unbind_rdev_from_array(rdev
);
2437 /* similar to deny_write_access, but accounts for our holding a reference
2438 * to the file ourselves */
2439 static int deny_bitmap_write_access(struct file
* file
)
2441 struct inode
*inode
= file
->f_mapping
->host
;
2443 spin_lock(&inode
->i_lock
);
2444 if (atomic_read(&inode
->i_writecount
) > 1) {
2445 spin_unlock(&inode
->i_lock
);
2448 atomic_set(&inode
->i_writecount
, -1);
2449 spin_unlock(&inode
->i_lock
);
2454 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
2459 if (!mddev
->pers
->quiesce
)
2461 if (mddev
->recovery
|| mddev
->sync_thread
)
2463 /* we should be able to change the bitmap.. */
2469 return -EEXIST
; /* cannot add when bitmap is present */
2470 mddev
->bitmap_file
= fget(fd
);
2472 if (mddev
->bitmap_file
== NULL
) {
2473 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
2478 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
2480 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
2482 fput(mddev
->bitmap_file
);
2483 mddev
->bitmap_file
= NULL
;
2486 mddev
->bitmap_offset
= 0; /* file overrides offset */
2487 } else if (mddev
->bitmap
== NULL
)
2488 return -ENOENT
; /* cannot remove what isn't there */
2491 mddev
->pers
->quiesce(mddev
, 1);
2493 err
= bitmap_create(mddev
);
2495 bitmap_destroy(mddev
);
2496 mddev
->pers
->quiesce(mddev
, 0);
2497 } else if (fd
< 0) {
2498 if (mddev
->bitmap_file
)
2499 fput(mddev
->bitmap_file
);
2500 mddev
->bitmap_file
= NULL
;
2507 * set_array_info is used two different ways
2508 * The original usage is when creating a new array.
2509 * In this usage, raid_disks is > 0 and it together with
2510 * level, size, not_persistent,layout,chunksize determine the
2511 * shape of the array.
2512 * This will always create an array with a type-0.90.0 superblock.
2513 * The newer usage is when assembling an array.
2514 * In this case raid_disks will be 0, and the major_version field is
2515 * use to determine which style super-blocks are to be found on the devices.
2516 * The minor and patch _version numbers are also kept incase the
2517 * super_block handler wishes to interpret them.
2519 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
2522 if (info
->raid_disks
== 0) {
2523 /* just setting version number for superblock loading */
2524 if (info
->major_version
< 0 ||
2525 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2526 super_types
[info
->major_version
].name
== NULL
) {
2527 /* maybe try to auto-load a module? */
2529 "md: superblock version %d not known\n",
2530 info
->major_version
);
2533 mddev
->major_version
= info
->major_version
;
2534 mddev
->minor_version
= info
->minor_version
;
2535 mddev
->patch_version
= info
->patch_version
;
2538 mddev
->major_version
= MD_MAJOR_VERSION
;
2539 mddev
->minor_version
= MD_MINOR_VERSION
;
2540 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
2541 mddev
->ctime
= get_seconds();
2543 mddev
->level
= info
->level
;
2544 mddev
->size
= info
->size
;
2545 mddev
->raid_disks
= info
->raid_disks
;
2546 /* don't set md_minor, it is determined by which /dev/md* was
2549 if (info
->state
& (1<<MD_SB_CLEAN
))
2550 mddev
->recovery_cp
= MaxSector
;
2552 mddev
->recovery_cp
= 0;
2553 mddev
->persistent
= ! info
->not_persistent
;
2555 mddev
->layout
= info
->layout
;
2556 mddev
->chunk_size
= info
->chunk_size
;
2558 mddev
->max_disks
= MD_SB_DISKS
;
2560 mddev
->sb_dirty
= 1;
2563 * Generate a 128 bit UUID
2565 get_random_bytes(mddev
->uuid
, 16);
2571 * update_array_info is used to change the configuration of an
2573 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2574 * fields in the info are checked against the array.
2575 * Any differences that cannot be handled will cause an error.
2576 * Normally, only one change can be managed at a time.
2578 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
2584 /* calculate expected state,ignoring low bits */
2585 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2586 state
|= (1 << MD_SB_BITMAP_PRESENT
);
2588 if (mddev
->major_version
!= info
->major_version
||
2589 mddev
->minor_version
!= info
->minor_version
||
2590 /* mddev->patch_version != info->patch_version || */
2591 mddev
->ctime
!= info
->ctime
||
2592 mddev
->level
!= info
->level
||
2593 /* mddev->layout != info->layout || */
2594 !mddev
->persistent
!= info
->not_persistent
||
2595 mddev
->chunk_size
!= info
->chunk_size
||
2596 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2597 ((state
^info
->state
) & 0xfffffe00)
2600 /* Check there is only one change */
2601 if (mddev
->size
!= info
->size
) cnt
++;
2602 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
2603 if (mddev
->layout
!= info
->layout
) cnt
++;
2604 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
2605 if (cnt
== 0) return 0;
2606 if (cnt
> 1) return -EINVAL
;
2608 if (mddev
->layout
!= info
->layout
) {
2610 * we don't need to do anything at the md level, the
2611 * personality will take care of it all.
2613 if (mddev
->pers
->reconfig
== NULL
)
2616 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
2618 if (mddev
->size
!= info
->size
) {
2620 struct list_head
*tmp
;
2621 if (mddev
->pers
->resize
== NULL
)
2623 /* The "size" is the amount of each device that is used.
2624 * This can only make sense for arrays with redundancy.
2625 * linear and raid0 always use whatever space is available
2626 * We can only consider changing the size if no resync
2627 * or reconstruction is happening, and if the new size
2628 * is acceptable. It must fit before the sb_offset or,
2629 * if that is <data_offset, it must fit before the
2630 * size of each device.
2631 * If size is zero, we find the largest size that fits.
2633 if (mddev
->sync_thread
)
2635 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2637 int fit
= (info
->size
== 0);
2638 if (rdev
->sb_offset
> rdev
->data_offset
)
2639 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
2641 avail
= get_capacity(rdev
->bdev
->bd_disk
)
2642 - rdev
->data_offset
;
2643 if (fit
&& (info
->size
== 0 || info
->size
> avail
/2))
2644 info
->size
= avail
/2;
2645 if (avail
< ((sector_t
)info
->size
<< 1))
2648 rv
= mddev
->pers
->resize(mddev
, (sector_t
)info
->size
*2);
2650 struct block_device
*bdev
;
2652 bdev
= bdget_disk(mddev
->gendisk
, 0);
2654 down(&bdev
->bd_inode
->i_sem
);
2655 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
2656 up(&bdev
->bd_inode
->i_sem
);
2661 if (mddev
->raid_disks
!= info
->raid_disks
) {
2662 /* change the number of raid disks */
2663 if (mddev
->pers
->reshape
== NULL
)
2665 if (info
->raid_disks
<= 0 ||
2666 info
->raid_disks
>= mddev
->max_disks
)
2668 if (mddev
->sync_thread
)
2670 rv
= mddev
->pers
->reshape(mddev
, info
->raid_disks
);
2672 struct block_device
*bdev
;
2674 bdev
= bdget_disk(mddev
->gendisk
, 0);
2676 down(&bdev
->bd_inode
->i_sem
);
2677 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
2678 up(&bdev
->bd_inode
->i_sem
);
2683 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
2684 if (mddev
->pers
->quiesce
== NULL
)
2686 if (mddev
->recovery
|| mddev
->sync_thread
)
2688 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
2689 /* add the bitmap */
2692 if (mddev
->default_bitmap_offset
== 0)
2694 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
2695 mddev
->pers
->quiesce(mddev
, 1);
2696 rv
= bitmap_create(mddev
);
2698 bitmap_destroy(mddev
);
2699 mddev
->pers
->quiesce(mddev
, 0);
2701 /* remove the bitmap */
2704 if (mddev
->bitmap
->file
)
2706 mddev
->pers
->quiesce(mddev
, 1);
2707 bitmap_destroy(mddev
);
2708 mddev
->pers
->quiesce(mddev
, 0);
2709 mddev
->bitmap_offset
= 0;
2712 md_update_sb(mddev
);
2716 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
2720 if (mddev
->pers
== NULL
)
2723 rdev
= find_rdev(mddev
, dev
);
2727 md_error(mddev
, rdev
);
2731 static int md_ioctl(struct inode
*inode
, struct file
*file
,
2732 unsigned int cmd
, unsigned long arg
)
2735 void __user
*argp
= (void __user
*)arg
;
2736 struct hd_geometry __user
*loc
= argp
;
2737 mddev_t
*mddev
= NULL
;
2739 if (!capable(CAP_SYS_ADMIN
))
2743 * Commands dealing with the RAID driver but not any
2749 err
= get_version(argp
);
2752 case PRINT_RAID_DEBUG
:
2760 autostart_arrays(arg
);
2767 * Commands creating/starting a new array:
2770 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
2778 if (cmd
== START_ARRAY
) {
2779 /* START_ARRAY doesn't need to lock the array as autostart_array
2780 * does the locking, and it could even be a different array
2785 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
2786 "This will not be supported beyond 2.6\n",
2787 current
->comm
, current
->pid
);
2790 err
= autostart_array(new_decode_dev(arg
));
2792 printk(KERN_WARNING
"md: autostart failed!\n");
2798 err
= mddev_lock(mddev
);
2801 "md: ioctl lock interrupted, reason %d, cmd %d\n",
2808 case SET_ARRAY_INFO
:
2810 mdu_array_info_t info
;
2812 memset(&info
, 0, sizeof(info
));
2813 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
2818 err
= update_array_info(mddev
, &info
);
2820 printk(KERN_WARNING
"md: couldn't update"
2821 " array info. %d\n", err
);
2826 if (!list_empty(&mddev
->disks
)) {
2828 "md: array %s already has disks!\n",
2833 if (mddev
->raid_disks
) {
2835 "md: array %s already initialised!\n",
2840 err
= set_array_info(mddev
, &info
);
2842 printk(KERN_WARNING
"md: couldn't set"
2843 " array info. %d\n", err
);
2853 * Commands querying/configuring an existing array:
2855 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
2856 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
2857 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
2858 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
2864 * Commands even a read-only array can execute:
2868 case GET_ARRAY_INFO
:
2869 err
= get_array_info(mddev
, argp
);
2872 case GET_BITMAP_FILE
:
2873 err
= get_bitmap_file(mddev
, argp
);
2877 err
= get_disk_info(mddev
, argp
);
2880 case RESTART_ARRAY_RW
:
2881 err
= restart_array(mddev
);
2885 err
= do_md_stop (mddev
, 0);
2889 err
= do_md_stop (mddev
, 1);
2893 * We have a problem here : there is no easy way to give a CHS
2894 * virtual geometry. We currently pretend that we have a 2 heads
2895 * 4 sectors (with a BIG number of cylinders...). This drives
2896 * dosfs just mad... ;-)
2903 err
= put_user (2, (char __user
*) &loc
->heads
);
2906 err
= put_user (4, (char __user
*) &loc
->sectors
);
2909 err
= put_user(get_capacity(mddev
->gendisk
)/8,
2910 (short __user
*) &loc
->cylinders
);
2913 err
= put_user (get_start_sect(inode
->i_bdev
),
2914 (long __user
*) &loc
->start
);
2919 * The remaining ioctls are changing the state of the
2920 * superblock, so we do not allow read-only arrays
2932 mdu_disk_info_t info
;
2933 if (copy_from_user(&info
, argp
, sizeof(info
)))
2936 err
= add_new_disk(mddev
, &info
);
2940 case HOT_REMOVE_DISK
:
2941 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
2945 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
2948 case SET_DISK_FAULTY
:
2949 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
2953 err
= do_md_run (mddev
);
2956 case SET_BITMAP_FILE
:
2957 err
= set_bitmap_file(mddev
, (int)arg
);
2961 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
2962 printk(KERN_WARNING
"md: %s(pid %d) used"
2963 " obsolete MD ioctl, upgrade your"
2964 " software to use new ictls.\n",
2965 current
->comm
, current
->pid
);
2972 mddev_unlock(mddev
);
2982 static int md_open(struct inode
*inode
, struct file
*file
)
2985 * Succeed if we can lock the mddev, which confirms that
2986 * it isn't being stopped right now.
2988 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
2991 if ((err
= mddev_lock(mddev
)))
2996 mddev_unlock(mddev
);
2998 check_disk_change(inode
->i_bdev
);
3003 static int md_release(struct inode
*inode
, struct file
* file
)
3005 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3014 static int md_media_changed(struct gendisk
*disk
)
3016 mddev_t
*mddev
= disk
->private_data
;
3018 return mddev
->changed
;
3021 static int md_revalidate(struct gendisk
*disk
)
3023 mddev_t
*mddev
= disk
->private_data
;
3028 static struct block_device_operations md_fops
=
3030 .owner
= THIS_MODULE
,
3032 .release
= md_release
,
3034 .media_changed
= md_media_changed
,
3035 .revalidate_disk
= md_revalidate
,
3038 static int md_thread(void * arg
)
3040 mdk_thread_t
*thread
= arg
;
3048 daemonize(thread
->name
, mdname(thread
->mddev
));
3050 current
->exit_signal
= SIGCHLD
;
3051 allow_signal(SIGKILL
);
3052 thread
->tsk
= current
;
3055 * md_thread is a 'system-thread', it's priority should be very
3056 * high. We avoid resource deadlocks individually in each
3057 * raid personality. (RAID5 does preallocation) We also use RR and
3058 * the very same RT priority as kswapd, thus we will never get
3059 * into a priority inversion deadlock.
3061 * we definitely have to have equal or higher priority than
3062 * bdflush, otherwise bdflush will deadlock if there are too
3063 * many dirty RAID5 blocks.
3067 complete(thread
->event
);
3068 while (thread
->run
) {
3069 void (*run
)(mddev_t
*);
3071 wait_event_interruptible_timeout(thread
->wqueue
,
3072 test_bit(THREAD_WAKEUP
, &thread
->flags
),
3076 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
3082 if (signal_pending(current
))
3083 flush_signals(current
);
3085 complete(thread
->event
);
3089 void md_wakeup_thread(mdk_thread_t
*thread
)
3092 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
3093 set_bit(THREAD_WAKEUP
, &thread
->flags
);
3094 wake_up(&thread
->wqueue
);
3098 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
3101 mdk_thread_t
*thread
;
3103 struct completion event
;
3105 thread
= (mdk_thread_t
*) kmalloc
3106 (sizeof(mdk_thread_t
), GFP_KERNEL
);
3110 memset(thread
, 0, sizeof(mdk_thread_t
));
3111 init_waitqueue_head(&thread
->wqueue
);
3113 init_completion(&event
);
3114 thread
->event
= &event
;
3116 thread
->mddev
= mddev
;
3117 thread
->name
= name
;
3118 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
3119 ret
= kernel_thread(md_thread
, thread
, 0);
3124 wait_for_completion(&event
);
3128 void md_unregister_thread(mdk_thread_t
*thread
)
3130 struct completion event
;
3132 init_completion(&event
);
3134 thread
->event
= &event
;
3136 /* As soon as ->run is set to NULL, the task could disappear,
3137 * so we need to hold tasklist_lock until we have sent the signal
3139 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
3140 read_lock(&tasklist_lock
);
3142 send_sig(SIGKILL
, thread
->tsk
, 1);
3143 read_unlock(&tasklist_lock
);
3144 wait_for_completion(&event
);
3148 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
3155 if (!rdev
|| rdev
->faulty
)
3158 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3160 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3161 __builtin_return_address(0),__builtin_return_address(1),
3162 __builtin_return_address(2),__builtin_return_address(3));
3164 if (!mddev
->pers
->error_handler
)
3166 mddev
->pers
->error_handler(mddev
,rdev
);
3167 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3168 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3169 md_wakeup_thread(mddev
->thread
);
3172 /* seq_file implementation /proc/mdstat */
3174 static void status_unused(struct seq_file
*seq
)
3178 struct list_head
*tmp
;
3180 seq_printf(seq
, "unused devices: ");
3182 ITERATE_RDEV_PENDING(rdev
,tmp
) {
3183 char b
[BDEVNAME_SIZE
];
3185 seq_printf(seq
, "%s ",
3186 bdevname(rdev
->bdev
,b
));
3189 seq_printf(seq
, "<none>");
3191 seq_printf(seq
, "\n");
3195 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
3197 unsigned long max_blocks
, resync
, res
, dt
, db
, rt
;
3199 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
3201 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3202 max_blocks
= mddev
->resync_max_sectors
>> 1;
3204 max_blocks
= mddev
->size
;
3207 * Should not happen.
3213 res
= (resync
/1024)*1000/(max_blocks
/1024 + 1);
3215 int i
, x
= res
/50, y
= 20-x
;
3216 seq_printf(seq
, "[");
3217 for (i
= 0; i
< x
; i
++)
3218 seq_printf(seq
, "=");
3219 seq_printf(seq
, ">");
3220 for (i
= 0; i
< y
; i
++)
3221 seq_printf(seq
, ".");
3222 seq_printf(seq
, "] ");
3224 seq_printf(seq
, " %s =%3lu.%lu%% (%lu/%lu)",
3225 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
3226 "resync" : "recovery"),
3227 res
/10, res
% 10, resync
, max_blocks
);
3230 * We do not want to overflow, so the order of operands and
3231 * the * 100 / 100 trick are important. We do a +1 to be
3232 * safe against division by zero. We only estimate anyway.
3234 * dt: time from mark until now
3235 * db: blocks written from mark until now
3236 * rt: remaining time
3238 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
3240 db
= resync
- (mddev
->resync_mark_cnt
/2);
3241 rt
= (dt
* ((max_blocks
-resync
) / (db
/100+1)))/100;
3243 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
3245 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
3248 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3250 struct list_head
*tmp
;
3260 spin_lock(&all_mddevs_lock
);
3261 list_for_each(tmp
,&all_mddevs
)
3263 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
3265 spin_unlock(&all_mddevs_lock
);
3268 spin_unlock(&all_mddevs_lock
);
3270 return (void*)2;/* tail */
3274 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3276 struct list_head
*tmp
;
3277 mddev_t
*next_mddev
, *mddev
= v
;
3283 spin_lock(&all_mddevs_lock
);
3285 tmp
= all_mddevs
.next
;
3287 tmp
= mddev
->all_mddevs
.next
;
3288 if (tmp
!= &all_mddevs
)
3289 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
3291 next_mddev
= (void*)2;
3294 spin_unlock(&all_mddevs_lock
);
3302 static void md_seq_stop(struct seq_file
*seq
, void *v
)
3306 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
3310 static int md_seq_show(struct seq_file
*seq
, void *v
)
3314 struct list_head
*tmp2
;
3317 struct bitmap
*bitmap
;
3319 if (v
== (void*)1) {
3320 seq_printf(seq
, "Personalities : ");
3321 spin_lock(&pers_lock
);
3322 for (i
= 0; i
< MAX_PERSONALITY
; i
++)
3324 seq_printf(seq
, "[%s] ", pers
[i
]->name
);
3326 spin_unlock(&pers_lock
);
3327 seq_printf(seq
, "\n");
3330 if (v
== (void*)2) {
3335 if (mddev_lock(mddev
)!=0)
3337 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
3338 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
3339 mddev
->pers
? "" : "in");
3342 seq_printf(seq
, " (read-only)");
3343 seq_printf(seq
, " %s", mddev
->pers
->name
);
3347 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
3348 char b
[BDEVNAME_SIZE
];
3349 seq_printf(seq
, " %s[%d]",
3350 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
3351 if (test_bit(WriteMostly
, &rdev
->flags
))
3352 seq_printf(seq
, "(W)");
3354 seq_printf(seq
, "(F)");
3360 if (!list_empty(&mddev
->disks
)) {
3362 seq_printf(seq
, "\n %llu blocks",
3363 (unsigned long long)mddev
->array_size
);
3365 seq_printf(seq
, "\n %llu blocks",
3366 (unsigned long long)size
);
3370 mddev
->pers
->status (seq
, mddev
);
3371 seq_printf(seq
, "\n ");
3372 if (mddev
->curr_resync
> 2) {
3373 status_resync (seq
, mddev
);
3374 seq_printf(seq
, "\n ");
3375 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
3376 seq_printf(seq
, " resync=DELAYED\n ");
3378 seq_printf(seq
, "\n ");
3380 if ((bitmap
= mddev
->bitmap
)) {
3381 unsigned long chunk_kb
;
3382 unsigned long flags
;
3383 spin_lock_irqsave(&bitmap
->lock
, flags
);
3384 chunk_kb
= bitmap
->chunksize
>> 10;
3385 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
3387 bitmap
->pages
- bitmap
->missing_pages
,
3389 (bitmap
->pages
- bitmap
->missing_pages
)
3390 << (PAGE_SHIFT
- 10),
3391 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
3392 chunk_kb
? "KB" : "B");
3394 seq_printf(seq
, ", file: ");
3395 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
3396 bitmap
->file
->f_dentry
," \t\n");
3399 seq_printf(seq
, "\n");
3400 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
3403 seq_printf(seq
, "\n");
3405 mddev_unlock(mddev
);
3410 static struct seq_operations md_seq_ops
= {
3411 .start
= md_seq_start
,
3412 .next
= md_seq_next
,
3413 .stop
= md_seq_stop
,
3414 .show
= md_seq_show
,
3417 static int md_seq_open(struct inode
*inode
, struct file
*file
)
3421 error
= seq_open(file
, &md_seq_ops
);
3425 static struct file_operations md_seq_fops
= {
3426 .open
= md_seq_open
,
3428 .llseek
= seq_lseek
,
3429 .release
= seq_release
,
3432 int register_md_personality(int pnum
, mdk_personality_t
*p
)
3434 if (pnum
>= MAX_PERSONALITY
) {
3436 "md: tried to install personality %s as nr %d, but max is %lu\n",
3437 p
->name
, pnum
, MAX_PERSONALITY
-1);
3441 spin_lock(&pers_lock
);
3443 spin_unlock(&pers_lock
);
3448 printk(KERN_INFO
"md: %s personality registered as nr %d\n", p
->name
, pnum
);
3449 spin_unlock(&pers_lock
);
3453 int unregister_md_personality(int pnum
)
3455 if (pnum
>= MAX_PERSONALITY
)
3458 printk(KERN_INFO
"md: %s personality unregistered\n", pers
[pnum
]->name
);
3459 spin_lock(&pers_lock
);
3461 spin_unlock(&pers_lock
);
3465 static int is_mddev_idle(mddev_t
*mddev
)
3468 struct list_head
*tmp
;
3470 unsigned long curr_events
;
3473 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3474 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
3475 curr_events
= disk_stat_read(disk
, read_sectors
) +
3476 disk_stat_read(disk
, write_sectors
) -
3477 atomic_read(&disk
->sync_io
);
3478 /* Allow some slack between valud of curr_events and last_events,
3479 * as there are some uninteresting races.
3480 * Note: the following is an unsigned comparison.
3482 if ((curr_events
- rdev
->last_events
+ 32) > 64) {
3483 rdev
->last_events
= curr_events
;
3490 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
3492 /* another "blocks" (512byte) blocks have been synced */
3493 atomic_sub(blocks
, &mddev
->recovery_active
);
3494 wake_up(&mddev
->recovery_wait
);
3496 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
3497 md_wakeup_thread(mddev
->thread
);
3498 // stop recovery, signal do_sync ....
3503 /* md_write_start(mddev, bi)
3504 * If we need to update some array metadata (e.g. 'active' flag
3505 * in superblock) before writing, schedule a superblock update
3506 * and wait for it to complete.
3508 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
3511 if (bio_data_dir(bi
) != WRITE
)
3514 atomic_inc(&mddev
->writes_pending
);
3515 if (mddev
->in_sync
) {
3516 spin_lock(&mddev
->write_lock
);
3517 if (mddev
->in_sync
) {
3519 mddev
->sb_dirty
= 1;
3520 md_wakeup_thread(mddev
->thread
);
3522 spin_unlock(&mddev
->write_lock
);
3524 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
3527 void md_write_end(mddev_t
*mddev
)
3529 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
3530 if (mddev
->safemode
== 2)
3531 md_wakeup_thread(mddev
->thread
);
3533 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
3537 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
3539 #define SYNC_MARKS 10
3540 #define SYNC_MARK_STEP (3*HZ)
3541 static void md_do_sync(mddev_t
*mddev
)
3544 unsigned int currspeed
= 0,
3546 sector_t max_sectors
,j
, io_sectors
;
3547 unsigned long mark
[SYNC_MARKS
];
3548 sector_t mark_cnt
[SYNC_MARKS
];
3550 struct list_head
*tmp
;
3551 sector_t last_check
;
3554 /* just incase thread restarts... */
3555 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
3558 /* we overload curr_resync somewhat here.
3559 * 0 == not engaged in resync at all
3560 * 2 == checking that there is no conflict with another sync
3561 * 1 == like 2, but have yielded to allow conflicting resync to
3563 * other == active in resync - this many blocks
3565 * Before starting a resync we must have set curr_resync to
3566 * 2, and then checked that every "conflicting" array has curr_resync
3567 * less than ours. When we find one that is the same or higher
3568 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
3569 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
3570 * This will mean we have to start checking from the beginning again.
3575 mddev
->curr_resync
= 2;
3578 if (signal_pending(current
)) {
3579 flush_signals(current
);
3582 ITERATE_MDDEV(mddev2
,tmp
) {
3583 if (mddev2
== mddev
)
3585 if (mddev2
->curr_resync
&&
3586 match_mddev_units(mddev
,mddev2
)) {
3588 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
3589 /* arbitrarily yield */
3590 mddev
->curr_resync
= 1;
3591 wake_up(&resync_wait
);
3593 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
3594 /* no need to wait here, we can wait the next
3595 * time 'round when curr_resync == 2
3598 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
3599 if (!signal_pending(current
)
3600 && mddev2
->curr_resync
>= mddev
->curr_resync
) {
3601 printk(KERN_INFO
"md: delaying resync of %s"
3602 " until %s has finished resync (they"
3603 " share one or more physical units)\n",
3604 mdname(mddev
), mdname(mddev2
));
3607 finish_wait(&resync_wait
, &wq
);
3610 finish_wait(&resync_wait
, &wq
);
3613 } while (mddev
->curr_resync
< 2);
3615 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3616 /* resync follows the size requested by the personality,
3617 * which defaults to physical size, but can be virtual size
3619 max_sectors
= mddev
->resync_max_sectors
;
3621 /* recovery follows the physical size of devices */
3622 max_sectors
= mddev
->size
<< 1;
3624 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
3625 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
3626 " %d KB/sec/disc.\n", sysctl_speed_limit_min
);
3627 printk(KERN_INFO
"md: using maximum available idle IO bandwith "
3628 "(but not more than %d KB/sec) for reconstruction.\n",
3629 sysctl_speed_limit_max
);
3631 is_mddev_idle(mddev
); /* this also initializes IO event counters */
3632 /* we don't use the checkpoint if there's a bitmap */
3633 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
)
3634 j
= mddev
->recovery_cp
;
3638 for (m
= 0; m
< SYNC_MARKS
; m
++) {
3640 mark_cnt
[m
] = io_sectors
;
3643 mddev
->resync_mark
= mark
[last_mark
];
3644 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
3647 * Tune reconstruction:
3649 window
= 32*(PAGE_SIZE
/512);
3650 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
3651 window
/2,(unsigned long long) max_sectors
/2);
3653 atomic_set(&mddev
->recovery_active
, 0);
3654 init_waitqueue_head(&mddev
->recovery_wait
);
3659 "md: resuming recovery of %s from checkpoint.\n",
3661 mddev
->curr_resync
= j
;
3664 while (j
< max_sectors
) {
3668 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
3669 currspeed
< sysctl_speed_limit_min
);
3671 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
3675 if (!skipped
) { /* actual IO requested */
3676 io_sectors
+= sectors
;
3677 atomic_add(sectors
, &mddev
->recovery_active
);
3681 if (j
>1) mddev
->curr_resync
= j
;
3684 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
3687 last_check
= io_sectors
;
3689 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
3690 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
3694 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
3696 int next
= (last_mark
+1) % SYNC_MARKS
;
3698 mddev
->resync_mark
= mark
[next
];
3699 mddev
->resync_mark_cnt
= mark_cnt
[next
];
3700 mark
[next
] = jiffies
;
3701 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
3706 if (signal_pending(current
)) {
3708 * got a signal, exit.
3711 "md: md_do_sync() got signal ... exiting\n");
3712 flush_signals(current
);
3713 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3718 * this loop exits only if either when we are slower than
3719 * the 'hard' speed limit, or the system was IO-idle for
3721 * the system might be non-idle CPU-wise, but we only care
3722 * about not overloading the IO subsystem. (things like an
3723 * e2fsck being done on the RAID array should execute fast)
3725 mddev
->queue
->unplug_fn(mddev
->queue
);
3728 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
3729 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
3731 if (currspeed
> sysctl_speed_limit_min
) {
3732 if ((currspeed
> sysctl_speed_limit_max
) ||
3733 !is_mddev_idle(mddev
)) {
3734 msleep_interruptible(250);
3739 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
3741 * this also signals 'finished resyncing' to md_stop
3744 mddev
->queue
->unplug_fn(mddev
->queue
);
3746 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
3748 /* tell personality that we are finished */
3749 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
3751 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
3752 mddev
->curr_resync
> 2 &&
3753 mddev
->curr_resync
>= mddev
->recovery_cp
) {
3754 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
3756 "md: checkpointing recovery of %s.\n",
3758 mddev
->recovery_cp
= mddev
->curr_resync
;
3760 mddev
->recovery_cp
= MaxSector
;
3764 mddev
->curr_resync
= 0;
3765 wake_up(&resync_wait
);
3766 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
3767 md_wakeup_thread(mddev
->thread
);
3772 * This routine is regularly called by all per-raid-array threads to
3773 * deal with generic issues like resync and super-block update.
3774 * Raid personalities that don't have a thread (linear/raid0) do not
3775 * need this as they never do any recovery or update the superblock.
3777 * It does not do any resync itself, but rather "forks" off other threads
3778 * to do that as needed.
3779 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
3780 * "->recovery" and create a thread at ->sync_thread.
3781 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
3782 * and wakeups up this thread which will reap the thread and finish up.
3783 * This thread also removes any faulty devices (with nr_pending == 0).
3785 * The overall approach is:
3786 * 1/ if the superblock needs updating, update it.
3787 * 2/ If a recovery thread is running, don't do anything else.
3788 * 3/ If recovery has finished, clean up, possibly marking spares active.
3789 * 4/ If there are any faulty devices, remove them.
3790 * 5/ If array is degraded, try to add spares devices
3791 * 6/ If array has spares or is not in-sync, start a resync thread.
3793 void md_check_recovery(mddev_t
*mddev
)
3796 struct list_head
*rtmp
;
3800 bitmap_daemon_work(mddev
->bitmap
);
3805 if (signal_pending(current
)) {
3806 if (mddev
->pers
->sync_request
) {
3807 printk(KERN_INFO
"md: %s in immediate safe mode\n",
3809 mddev
->safemode
= 2;
3811 flush_signals(current
);
3816 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
3817 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
3818 (mddev
->safemode
== 1) ||
3819 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
3820 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
3824 if (mddev_trylock(mddev
)==0) {
3827 spin_lock(&mddev
->write_lock
);
3828 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
3829 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
3831 mddev
->sb_dirty
= 1;
3833 if (mddev
->safemode
== 1)
3834 mddev
->safemode
= 0;
3835 spin_unlock(&mddev
->write_lock
);
3837 if (mddev
->sb_dirty
)
3838 md_update_sb(mddev
);
3841 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
3842 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
3843 /* resync/recovery still happening */
3844 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3847 if (mddev
->sync_thread
) {
3848 /* resync has finished, collect result */
3849 md_unregister_thread(mddev
->sync_thread
);
3850 mddev
->sync_thread
= NULL
;
3851 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
3852 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
3854 /* activate any spares */
3855 mddev
->pers
->spare_active(mddev
);
3857 md_update_sb(mddev
);
3859 /* if array is no-longer degraded, then any saved_raid_disk
3860 * information must be scrapped
3862 if (!mddev
->degraded
)
3863 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3864 rdev
->saved_raid_disk
= -1;
3866 mddev
->recovery
= 0;
3867 /* flag recovery needed just to double check */
3868 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3871 if (mddev
->recovery
)
3872 /* probably just the RECOVERY_NEEDED flag */
3873 mddev
->recovery
= 0;
3875 /* no recovery is running.
3876 * remove any failed drives, then
3877 * add spares if possible.
3878 * Spare are also removed and re-added, to allow
3879 * the personality to fail the re-add.
3881 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3882 if (rdev
->raid_disk
>= 0 &&
3883 (rdev
->faulty
|| ! rdev
->in_sync
) &&
3884 atomic_read(&rdev
->nr_pending
)==0) {
3885 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0)
3886 rdev
->raid_disk
= -1;
3889 if (mddev
->degraded
) {
3890 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3891 if (rdev
->raid_disk
< 0
3893 if (mddev
->pers
->hot_add_disk(mddev
,rdev
))
3900 if (!spares
&& (mddev
->recovery_cp
== MaxSector
)) {
3901 /* nothing we can do ... */
3904 if (mddev
->pers
->sync_request
) {
3905 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3907 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3908 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
3909 /* We are adding a device or devices to an array
3910 * which has the bitmap stored on all devices.
3911 * So make sure all bitmap pages get written
3913 bitmap_write_all(mddev
->bitmap
);
3915 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3918 if (!mddev
->sync_thread
) {
3919 printk(KERN_ERR
"%s: could not start resync"
3922 /* leave the spares where they are, it shouldn't hurt */
3923 mddev
->recovery
= 0;
3925 md_wakeup_thread(mddev
->sync_thread
);
3929 mddev_unlock(mddev
);
3933 static int md_notify_reboot(struct notifier_block
*this,
3934 unsigned long code
, void *x
)
3936 struct list_head
*tmp
;
3939 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
3941 printk(KERN_INFO
"md: stopping all md devices.\n");
3943 ITERATE_MDDEV(mddev
,tmp
)
3944 if (mddev_trylock(mddev
)==0)
3945 do_md_stop (mddev
, 1);
3947 * certain more exotic SCSI devices are known to be
3948 * volatile wrt too early system reboots. While the
3949 * right place to handle this issue is the given
3950 * driver, we do want to have a safe RAID driver ...
3957 static struct notifier_block md_notifier
= {
3958 .notifier_call
= md_notify_reboot
,
3960 .priority
= INT_MAX
, /* before any real devices */
3963 static void md_geninit(void)
3965 struct proc_dir_entry
*p
;
3967 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
3969 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
3971 p
->proc_fops
= &md_seq_fops
;
3974 static int __init
md_init(void)
3978 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
3979 " MD_SB_DISKS=%d\n",
3980 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
3981 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
3982 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR
,
3985 if (register_blkdev(MAJOR_NR
, "md"))
3987 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
3988 unregister_blkdev(MAJOR_NR
, "md");
3992 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
3993 md_probe
, NULL
, NULL
);
3994 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
3995 md_probe
, NULL
, NULL
);
3997 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
3998 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
3999 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4002 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4003 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
4004 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4008 register_reboot_notifier(&md_notifier
);
4009 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
4019 * Searches all registered partitions for autorun RAID arrays
4022 static dev_t detected_devices
[128];
4025 void md_autodetect_dev(dev_t dev
)
4027 if (dev_cnt
>= 0 && dev_cnt
< 127)
4028 detected_devices
[dev_cnt
++] = dev
;
4032 static void autostart_arrays(int part
)
4037 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
4039 for (i
= 0; i
< dev_cnt
; i
++) {
4040 dev_t dev
= detected_devices
[i
];
4042 rdev
= md_import_device(dev
,0, 0);
4050 list_add(&rdev
->same_set
, &pending_raid_disks
);
4054 autorun_devices(part
);
4059 static __exit
void md_exit(void)
4062 struct list_head
*tmp
;
4064 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
4065 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
4066 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4067 devfs_remove("md/%d", i
);
4068 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4069 devfs_remove("md/d%d", i
);
4073 unregister_blkdev(MAJOR_NR
,"md");
4074 unregister_blkdev(mdp_major
, "mdp");
4075 unregister_reboot_notifier(&md_notifier
);
4076 unregister_sysctl_table(raid_table_header
);
4077 remove_proc_entry("mdstat", NULL
);
4078 ITERATE_MDDEV(mddev
,tmp
) {
4079 struct gendisk
*disk
= mddev
->gendisk
;
4082 export_array(mddev
);
4085 mddev
->gendisk
= NULL
;
4090 module_init(md_init
)
4091 module_exit(md_exit
)
4093 EXPORT_SYMBOL(register_md_personality
);
4094 EXPORT_SYMBOL(unregister_md_personality
);
4095 EXPORT_SYMBOL(md_error
);
4096 EXPORT_SYMBOL(md_done_sync
);
4097 EXPORT_SYMBOL(md_write_start
);
4098 EXPORT_SYMBOL(md_write_end
);
4099 EXPORT_SYMBOL(md_register_thread
);
4100 EXPORT_SYMBOL(md_unregister_thread
);
4101 EXPORT_SYMBOL(md_wakeup_thread
);
4102 EXPORT_SYMBOL(md_print_devices
);
4103 EXPORT_SYMBOL(md_check_recovery
);
4104 MODULE_LICENSE("GPL");
4106 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);