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/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/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
46 #include <linux/init.h>
48 #include <linux/file.h>
51 #include <linux/kmod.h>
54 #include <asm/unaligned.h>
56 #define MAJOR_NR MD_MAJOR
59 /* 63 partitions with the alternate major number (mdp) */
60 #define MdpMinorShift 6
63 #define dprintk(x...) ((void)(DEBUG && printk(x)))
67 static void autostart_arrays (int part
);
70 static mdk_personality_t
*pers
[MAX_PERSONALITY
];
71 static DEFINE_SPINLOCK(pers_lock
);
74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
75 * is 1000 KB/sec, so the extra system load does not show up that much.
76 * Increase it if you want to have more _guaranteed_ speed. Note that
77 * the RAID driver will use the maximum available bandwidth if the IO
78 * subsystem is idle. There is also an 'absolute maximum' reconstruction
79 * speed limit - in case reconstruction slows down your system despite
82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
85 static int sysctl_speed_limit_min
= 1000;
86 static int sysctl_speed_limit_max
= 200000;
88 static struct ctl_table_header
*raid_table_header
;
90 static ctl_table raid_table
[] = {
92 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
93 .procname
= "speed_limit_min",
94 .data
= &sysctl_speed_limit_min
,
95 .maxlen
= sizeof(int),
97 .proc_handler
= &proc_dointvec
,
100 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
101 .procname
= "speed_limit_max",
102 .data
= &sysctl_speed_limit_max
,
103 .maxlen
= sizeof(int),
105 .proc_handler
= &proc_dointvec
,
110 static ctl_table raid_dir_table
[] = {
112 .ctl_name
= DEV_RAID
,
121 static ctl_table raid_root_table
[] = {
127 .child
= raid_dir_table
,
132 static struct block_device_operations md_fops
;
135 * Enables to iterate over all existing md arrays
136 * all_mddevs_lock protects this list.
138 static LIST_HEAD(all_mddevs
);
139 static DEFINE_SPINLOCK(all_mddevs_lock
);
143 * iterates through all used mddevs in the system.
144 * We take care to grab the all_mddevs_lock whenever navigating
145 * the list, and to always hold a refcount when unlocked.
146 * Any code which breaks out of this loop while own
147 * a reference to the current mddev and must mddev_put it.
149 #define ITERATE_MDDEV(mddev,tmp) \
151 for (({ spin_lock(&all_mddevs_lock); \
152 tmp = all_mddevs.next; \
154 ({ if (tmp != &all_mddevs) \
155 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
156 spin_unlock(&all_mddevs_lock); \
157 if (mddev) mddev_put(mddev); \
158 mddev = list_entry(tmp, mddev_t, all_mddevs); \
159 tmp != &all_mddevs;}); \
160 ({ spin_lock(&all_mddevs_lock); \
165 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
167 bio_io_error(bio
, bio
->bi_size
);
171 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
173 atomic_inc(&mddev
->active
);
177 static void mddev_put(mddev_t
*mddev
)
179 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
181 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
182 list_del(&mddev
->all_mddevs
);
183 blk_put_queue(mddev
->queue
);
184 kobject_unregister(&mddev
->kobj
);
186 spin_unlock(&all_mddevs_lock
);
189 static mddev_t
* mddev_find(dev_t unit
)
191 mddev_t
*mddev
, *new = NULL
;
194 spin_lock(&all_mddevs_lock
);
195 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
196 if (mddev
->unit
== unit
) {
198 spin_unlock(&all_mddevs_lock
);
204 list_add(&new->all_mddevs
, &all_mddevs
);
205 spin_unlock(&all_mddevs_lock
);
208 spin_unlock(&all_mddevs_lock
);
210 new = (mddev_t
*) kmalloc(sizeof(*new), GFP_KERNEL
);
214 memset(new, 0, sizeof(*new));
217 if (MAJOR(unit
) == MD_MAJOR
)
218 new->md_minor
= MINOR(unit
);
220 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
222 init_MUTEX(&new->reconfig_sem
);
223 INIT_LIST_HEAD(&new->disks
);
224 INIT_LIST_HEAD(&new->all_mddevs
);
225 init_timer(&new->safemode_timer
);
226 atomic_set(&new->active
, 1);
227 spin_lock_init(&new->write_lock
);
228 init_waitqueue_head(&new->sb_wait
);
230 new->queue
= blk_alloc_queue(GFP_KERNEL
);
236 blk_queue_make_request(new->queue
, md_fail_request
);
241 static inline int mddev_lock(mddev_t
* mddev
)
243 return down_interruptible(&mddev
->reconfig_sem
);
246 static inline void mddev_lock_uninterruptible(mddev_t
* mddev
)
248 down(&mddev
->reconfig_sem
);
251 static inline int mddev_trylock(mddev_t
* mddev
)
253 return down_trylock(&mddev
->reconfig_sem
);
256 static inline void mddev_unlock(mddev_t
* mddev
)
258 up(&mddev
->reconfig_sem
);
260 md_wakeup_thread(mddev
->thread
);
263 mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
266 struct list_head
*tmp
;
268 ITERATE_RDEV(mddev
,rdev
,tmp
) {
269 if (rdev
->desc_nr
== nr
)
275 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
277 struct list_head
*tmp
;
280 ITERATE_RDEV(mddev
,rdev
,tmp
) {
281 if (rdev
->bdev
->bd_dev
== dev
)
287 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
289 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
290 return MD_NEW_SIZE_BLOCKS(size
);
293 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
297 size
= rdev
->sb_offset
;
300 size
&= ~((sector_t
)chunk_size
/1024 - 1);
304 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
309 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
310 if (!rdev
->sb_page
) {
311 printk(KERN_ALERT
"md: out of memory.\n");
318 static void free_disk_sb(mdk_rdev_t
* rdev
)
321 page_cache_release(rdev
->sb_page
);
323 rdev
->sb_page
= NULL
;
330 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
332 mdk_rdev_t
*rdev
= bio
->bi_private
;
336 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
337 md_error(rdev
->mddev
, rdev
);
339 if (atomic_dec_and_test(&rdev
->mddev
->pending_writes
))
340 wake_up(&rdev
->mddev
->sb_wait
);
345 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
346 sector_t sector
, int size
, struct page
*page
)
348 /* write first size bytes of page to sector of rdev
349 * Increment mddev->pending_writes before returning
350 * and decrement it on completion, waking up sb_wait
351 * if zero is reached.
352 * If an error occurred, call md_error
354 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
356 bio
->bi_bdev
= rdev
->bdev
;
357 bio
->bi_sector
= sector
;
358 bio_add_page(bio
, page
, size
, 0);
359 bio
->bi_private
= rdev
;
360 bio
->bi_end_io
= super_written
;
361 atomic_inc(&mddev
->pending_writes
);
362 submit_bio((1<<BIO_RW
)|(1<<BIO_RW_SYNC
), bio
);
365 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
370 complete((struct completion
*)bio
->bi_private
);
374 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
375 struct page
*page
, int rw
)
377 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
378 struct completion event
;
381 rw
|= (1 << BIO_RW_SYNC
);
384 bio
->bi_sector
= sector
;
385 bio_add_page(bio
, page
, size
, 0);
386 init_completion(&event
);
387 bio
->bi_private
= &event
;
388 bio
->bi_end_io
= bi_complete
;
390 wait_for_completion(&event
);
392 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
397 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
399 char b
[BDEVNAME_SIZE
];
400 if (!rdev
->sb_page
) {
408 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
414 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
415 bdevname(rdev
->bdev
,b
));
419 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
421 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
422 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
423 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
424 (sb1
->set_uuid3
== sb2
->set_uuid3
))
432 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
435 mdp_super_t
*tmp1
, *tmp2
;
437 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
438 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
440 if (!tmp1
|| !tmp2
) {
442 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
450 * nr_disks is not constant
455 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
466 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
468 unsigned int disk_csum
, csum
;
470 disk_csum
= sb
->sb_csum
;
472 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
473 sb
->sb_csum
= disk_csum
;
479 * Handle superblock details.
480 * We want to be able to handle multiple superblock formats
481 * so we have a common interface to them all, and an array of
482 * different handlers.
483 * We rely on user-space to write the initial superblock, and support
484 * reading and updating of superblocks.
485 * Interface methods are:
486 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
487 * loads and validates a superblock on dev.
488 * if refdev != NULL, compare superblocks on both devices
490 * 0 - dev has a superblock that is compatible with refdev
491 * 1 - dev has a superblock that is compatible and newer than refdev
492 * so dev should be used as the refdev in future
493 * -EINVAL superblock incompatible or invalid
494 * -othererror e.g. -EIO
496 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
497 * Verify that dev is acceptable into mddev.
498 * The first time, mddev->raid_disks will be 0, and data from
499 * dev should be merged in. Subsequent calls check that dev
500 * is new enough. Return 0 or -EINVAL
502 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
503 * Update the superblock for rdev with data in mddev
504 * This does not write to disc.
510 struct module
*owner
;
511 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
512 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
513 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
517 * load_super for 0.90.0
519 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
521 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
527 * Calculate the position of the superblock,
528 * it's at the end of the disk.
530 * It also happens to be a multiple of 4Kb.
532 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
533 rdev
->sb_offset
= sb_offset
;
535 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
540 bdevname(rdev
->bdev
, b
);
541 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
543 if (sb
->md_magic
!= MD_SB_MAGIC
) {
544 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
549 if (sb
->major_version
!= 0 ||
550 sb
->minor_version
!= 90) {
551 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
552 sb
->major_version
, sb
->minor_version
,
557 if (sb
->raid_disks
<= 0)
560 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
561 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
566 rdev
->preferred_minor
= sb
->md_minor
;
567 rdev
->data_offset
= 0;
568 rdev
->sb_size
= MD_SB_BYTES
;
570 if (sb
->level
== LEVEL_MULTIPATH
)
573 rdev
->desc_nr
= sb
->this_disk
.number
;
579 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
580 if (!uuid_equal(refsb
, sb
)) {
581 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
582 b
, bdevname(refdev
->bdev
,b2
));
585 if (!sb_equal(refsb
, sb
)) {
586 printk(KERN_WARNING
"md: %s has same UUID"
587 " but different superblock to %s\n",
588 b
, bdevname(refdev
->bdev
, b2
));
592 ev2
= md_event(refsb
);
598 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
605 * validate_super for 0.90.0
607 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
610 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
612 rdev
->raid_disk
= -1;
614 if (mddev
->raid_disks
== 0) {
615 mddev
->major_version
= 0;
616 mddev
->minor_version
= sb
->minor_version
;
617 mddev
->patch_version
= sb
->patch_version
;
618 mddev
->persistent
= ! sb
->not_persistent
;
619 mddev
->chunk_size
= sb
->chunk_size
;
620 mddev
->ctime
= sb
->ctime
;
621 mddev
->utime
= sb
->utime
;
622 mddev
->level
= sb
->level
;
623 mddev
->layout
= sb
->layout
;
624 mddev
->raid_disks
= sb
->raid_disks
;
625 mddev
->size
= sb
->size
;
626 mddev
->events
= md_event(sb
);
627 mddev
->bitmap_offset
= 0;
628 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
630 if (sb
->state
& (1<<MD_SB_CLEAN
))
631 mddev
->recovery_cp
= MaxSector
;
633 if (sb
->events_hi
== sb
->cp_events_hi
&&
634 sb
->events_lo
== sb
->cp_events_lo
) {
635 mddev
->recovery_cp
= sb
->recovery_cp
;
637 mddev
->recovery_cp
= 0;
640 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
641 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
642 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
643 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
645 mddev
->max_disks
= MD_SB_DISKS
;
647 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
648 mddev
->bitmap_file
== NULL
) {
649 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6) {
650 /* FIXME use a better test */
651 printk(KERN_WARNING
"md: bitmaps only support for raid1\n");
654 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
657 } else if (mddev
->pers
== NULL
) {
658 /* Insist on good event counter while assembling */
659 __u64 ev1
= md_event(sb
);
661 if (ev1
< mddev
->events
)
663 } else if (mddev
->bitmap
) {
664 /* if adding to array with a bitmap, then we can accept an
665 * older device ... but not too old.
667 __u64 ev1
= md_event(sb
);
668 if (ev1
< mddev
->bitmap
->events_cleared
)
670 } else /* just a hot-add of a new device, leave raid_disk at -1 */
673 if (mddev
->level
!= LEVEL_MULTIPATH
) {
676 desc
= sb
->disks
+ rdev
->desc_nr
;
678 if (desc
->state
& (1<<MD_DISK_FAULTY
))
680 else if (desc
->state
& (1<<MD_DISK_SYNC
) &&
681 desc
->raid_disk
< mddev
->raid_disks
) {
683 rdev
->raid_disk
= desc
->raid_disk
;
685 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
686 set_bit(WriteMostly
, &rdev
->flags
);
687 } else /* MULTIPATH are always insync */
693 * sync_super for 0.90.0
695 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
698 struct list_head
*tmp
;
700 int next_spare
= mddev
->raid_disks
;
702 /* make rdev->sb match mddev data..
705 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
706 * 3/ any empty disks < next_spare become removed
708 * disks[0] gets initialised to REMOVED because
709 * we cannot be sure from other fields if it has
710 * been initialised or not.
713 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
715 rdev
->sb_size
= MD_SB_BYTES
;
717 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
719 memset(sb
, 0, sizeof(*sb
));
721 sb
->md_magic
= MD_SB_MAGIC
;
722 sb
->major_version
= mddev
->major_version
;
723 sb
->minor_version
= mddev
->minor_version
;
724 sb
->patch_version
= mddev
->patch_version
;
725 sb
->gvalid_words
= 0; /* ignored */
726 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
727 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
728 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
729 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
731 sb
->ctime
= mddev
->ctime
;
732 sb
->level
= mddev
->level
;
733 sb
->size
= mddev
->size
;
734 sb
->raid_disks
= mddev
->raid_disks
;
735 sb
->md_minor
= mddev
->md_minor
;
736 sb
->not_persistent
= !mddev
->persistent
;
737 sb
->utime
= mddev
->utime
;
739 sb
->events_hi
= (mddev
->events
>>32);
740 sb
->events_lo
= (u32
)mddev
->events
;
744 sb
->recovery_cp
= mddev
->recovery_cp
;
745 sb
->cp_events_hi
= (mddev
->events
>>32);
746 sb
->cp_events_lo
= (u32
)mddev
->events
;
747 if (mddev
->recovery_cp
== MaxSector
)
748 sb
->state
= (1<< MD_SB_CLEAN
);
752 sb
->layout
= mddev
->layout
;
753 sb
->chunk_size
= mddev
->chunk_size
;
755 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
756 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
758 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
759 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
761 if (rdev2
->raid_disk
>= 0 && rdev2
->in_sync
&& !rdev2
->faulty
)
762 rdev2
->desc_nr
= rdev2
->raid_disk
;
764 rdev2
->desc_nr
= next_spare
++;
765 d
= &sb
->disks
[rdev2
->desc_nr
];
767 d
->number
= rdev2
->desc_nr
;
768 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
769 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
770 if (rdev2
->raid_disk
>= 0 && rdev
->in_sync
&& !rdev2
->faulty
)
771 d
->raid_disk
= rdev2
->raid_disk
;
773 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
775 d
->state
= (1<<MD_DISK_FAULTY
);
777 } else if (rdev2
->in_sync
) {
778 d
->state
= (1<<MD_DISK_ACTIVE
);
779 d
->state
|= (1<<MD_DISK_SYNC
);
787 if (test_bit(WriteMostly
, &rdev2
->flags
))
788 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
791 /* now set the "removed" and "faulty" bits on any missing devices */
792 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
793 mdp_disk_t
*d
= &sb
->disks
[i
];
794 if (d
->state
== 0 && d
->number
== 0) {
797 d
->state
= (1<<MD_DISK_REMOVED
);
798 d
->state
|= (1<<MD_DISK_FAULTY
);
802 sb
->nr_disks
= nr_disks
;
803 sb
->active_disks
= active
;
804 sb
->working_disks
= working
;
805 sb
->failed_disks
= failed
;
806 sb
->spare_disks
= spare
;
808 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
809 sb
->sb_csum
= calc_sb_csum(sb
);
813 * version 1 superblock
816 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
818 unsigned int disk_csum
, csum
;
819 unsigned long long newcsum
;
820 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
821 unsigned int *isuper
= (unsigned int*)sb
;
824 disk_csum
= sb
->sb_csum
;
827 for (i
=0; size
>=4; size
-= 4 )
828 newcsum
+= le32_to_cpu(*isuper
++);
831 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
833 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
834 sb
->sb_csum
= disk_csum
;
835 return cpu_to_le32(csum
);
838 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
840 struct mdp_superblock_1
*sb
;
843 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
847 * Calculate the position of the superblock.
848 * It is always aligned to a 4K boundary and
849 * depeding on minor_version, it can be:
850 * 0: At least 8K, but less than 12K, from end of device
851 * 1: At start of device
852 * 2: 4K from start of device.
854 switch(minor_version
) {
856 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
858 sb_offset
&= ~(sector_t
)(4*2-1);
859 /* convert from sectors to K */
871 rdev
->sb_offset
= sb_offset
;
873 /* superblock is rarely larger than 1K, but it can be larger,
874 * and it is safe to read 4k, so we do that
876 ret
= read_disk_sb(rdev
, 4096);
880 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
882 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
883 sb
->major_version
!= cpu_to_le32(1) ||
884 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
885 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
886 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
889 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
890 printk("md: invalid superblock checksum on %s\n",
891 bdevname(rdev
->bdev
,b
));
894 if (le64_to_cpu(sb
->data_size
) < 10) {
895 printk("md: data_size too small on %s\n",
896 bdevname(rdev
->bdev
,b
));
899 rdev
->preferred_minor
= 0xffff;
900 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
902 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
903 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
904 if (rdev
->sb_size
& bmask
)
905 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
911 struct mdp_superblock_1
*refsb
=
912 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
914 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
915 sb
->level
!= refsb
->level
||
916 sb
->layout
!= refsb
->layout
||
917 sb
->chunksize
!= refsb
->chunksize
) {
918 printk(KERN_WARNING
"md: %s has strangely different"
919 " superblock to %s\n",
920 bdevname(rdev
->bdev
,b
),
921 bdevname(refdev
->bdev
,b2
));
924 ev1
= le64_to_cpu(sb
->events
);
925 ev2
= le64_to_cpu(refsb
->events
);
931 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
933 rdev
->size
= rdev
->sb_offset
;
934 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
936 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
937 if (le32_to_cpu(sb
->chunksize
))
938 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
942 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
944 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
946 rdev
->raid_disk
= -1;
948 if (mddev
->raid_disks
== 0) {
949 mddev
->major_version
= 1;
950 mddev
->patch_version
= 0;
951 mddev
->persistent
= 1;
952 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
953 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
954 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
955 mddev
->level
= le32_to_cpu(sb
->level
);
956 mddev
->layout
= le32_to_cpu(sb
->layout
);
957 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
958 mddev
->size
= le64_to_cpu(sb
->size
)/2;
959 mddev
->events
= le64_to_cpu(sb
->events
);
960 mddev
->bitmap_offset
= 0;
961 mddev
->default_bitmap_offset
= 0;
962 mddev
->default_bitmap_offset
= 1024;
964 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
965 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
967 mddev
->max_disks
= (4096-256)/2;
969 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
970 mddev
->bitmap_file
== NULL
) {
971 if (mddev
->level
!= 1) {
972 printk(KERN_WARNING
"md: bitmaps only supported for raid1\n");
975 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
977 } else if (mddev
->pers
== NULL
) {
978 /* Insist of good event counter while assembling */
979 __u64 ev1
= le64_to_cpu(sb
->events
);
981 if (ev1
< mddev
->events
)
983 } else if (mddev
->bitmap
) {
984 /* If adding to array with a bitmap, then we can accept an
985 * older device, but not too old.
987 __u64 ev1
= le64_to_cpu(sb
->events
);
988 if (ev1
< mddev
->bitmap
->events_cleared
)
990 } else /* just a hot-add of a new device, leave raid_disk at -1 */
993 if (mddev
->level
!= LEVEL_MULTIPATH
) {
995 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
996 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
998 case 0xffff: /* spare */
1001 case 0xfffe: /* faulty */
1007 rdev
->raid_disk
= role
;
1011 if (sb
->devflags
& WriteMostly1
)
1012 set_bit(WriteMostly
, &rdev
->flags
);
1013 } else /* MULTIPATH are always insync */
1019 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1021 struct mdp_superblock_1
*sb
;
1022 struct list_head
*tmp
;
1025 /* make rdev->sb match mddev and rdev data. */
1027 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1029 sb
->feature_map
= 0;
1031 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1032 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1033 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1035 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1036 sb
->events
= cpu_to_le64(mddev
->events
);
1038 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1040 sb
->resync_offset
= cpu_to_le64(0);
1042 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1043 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1044 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1048 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1049 if (rdev2
->desc_nr
+1 > max_dev
)
1050 max_dev
= rdev2
->desc_nr
+1;
1052 sb
->max_dev
= cpu_to_le32(max_dev
);
1053 for (i
=0; i
<max_dev
;i
++)
1054 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1056 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1059 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1060 else if (rdev2
->in_sync
)
1061 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1063 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1066 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1067 sb
->sb_csum
= calc_sb_1_csum(sb
);
1071 static struct super_type super_types
[] = {
1074 .owner
= THIS_MODULE
,
1075 .load_super
= super_90_load
,
1076 .validate_super
= super_90_validate
,
1077 .sync_super
= super_90_sync
,
1081 .owner
= THIS_MODULE
,
1082 .load_super
= super_1_load
,
1083 .validate_super
= super_1_validate
,
1084 .sync_super
= super_1_sync
,
1088 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1090 struct list_head
*tmp
;
1093 ITERATE_RDEV(mddev
,rdev
,tmp
)
1094 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1100 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1102 struct list_head
*tmp
;
1105 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1106 if (match_dev_unit(mddev2
, rdev
))
1112 static LIST_HEAD(pending_raid_disks
);
1114 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1116 mdk_rdev_t
*same_pdev
;
1117 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1123 same_pdev
= match_dev_unit(mddev
, rdev
);
1126 "%s: WARNING: %s appears to be on the same physical"
1127 " disk as %s. True\n protection against single-disk"
1128 " failure might be compromised.\n",
1129 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1130 bdevname(same_pdev
->bdev
,b2
));
1132 /* Verify rdev->desc_nr is unique.
1133 * If it is -1, assign a free number, else
1134 * check number is not in use
1136 if (rdev
->desc_nr
< 0) {
1138 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1139 while (find_rdev_nr(mddev
, choice
))
1141 rdev
->desc_nr
= choice
;
1143 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1147 list_add(&rdev
->same_set
, &mddev
->disks
);
1148 rdev
->mddev
= mddev
;
1149 printk(KERN_INFO
"md: bind<%s>\n", bdevname(rdev
->bdev
,b
));
1153 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1155 char b
[BDEVNAME_SIZE
];
1160 list_del_init(&rdev
->same_set
);
1161 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1166 * prevent the device from being mounted, repartitioned or
1167 * otherwise reused by a RAID array (or any other kernel
1168 * subsystem), by bd_claiming the device.
1170 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1173 struct block_device
*bdev
;
1174 char b
[BDEVNAME_SIZE
];
1176 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1178 printk(KERN_ERR
"md: could not open %s.\n",
1179 __bdevname(dev
, b
));
1180 return PTR_ERR(bdev
);
1182 err
= bd_claim(bdev
, rdev
);
1184 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1193 static void unlock_rdev(mdk_rdev_t
*rdev
)
1195 struct block_device
*bdev
= rdev
->bdev
;
1203 void md_autodetect_dev(dev_t dev
);
1205 static void export_rdev(mdk_rdev_t
* rdev
)
1207 char b
[BDEVNAME_SIZE
];
1208 printk(KERN_INFO
"md: export_rdev(%s)\n",
1209 bdevname(rdev
->bdev
,b
));
1213 list_del_init(&rdev
->same_set
);
1215 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1221 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1223 unbind_rdev_from_array(rdev
);
1227 static void export_array(mddev_t
*mddev
)
1229 struct list_head
*tmp
;
1232 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1237 kick_rdev_from_array(rdev
);
1239 if (!list_empty(&mddev
->disks
))
1241 mddev
->raid_disks
= 0;
1242 mddev
->major_version
= 0;
1245 static void print_desc(mdp_disk_t
*desc
)
1247 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1248 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1251 static void print_sb(mdp_super_t
*sb
)
1256 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1257 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1258 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1260 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1261 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1262 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1263 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1264 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1265 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1266 sb
->failed_disks
, sb
->spare_disks
,
1267 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1270 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1273 desc
= sb
->disks
+ i
;
1274 if (desc
->number
|| desc
->major
|| desc
->minor
||
1275 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1276 printk(" D %2d: ", i
);
1280 printk(KERN_INFO
"md: THIS: ");
1281 print_desc(&sb
->this_disk
);
1285 static void print_rdev(mdk_rdev_t
*rdev
)
1287 char b
[BDEVNAME_SIZE
];
1288 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1289 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1290 rdev
->faulty
, rdev
->in_sync
, rdev
->desc_nr
);
1291 if (rdev
->sb_loaded
) {
1292 printk(KERN_INFO
"md: rdev superblock:\n");
1293 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1295 printk(KERN_INFO
"md: no rdev superblock!\n");
1298 void md_print_devices(void)
1300 struct list_head
*tmp
, *tmp2
;
1303 char b
[BDEVNAME_SIZE
];
1306 printk("md: **********************************\n");
1307 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1308 printk("md: **********************************\n");
1309 ITERATE_MDDEV(mddev
,tmp
) {
1312 bitmap_print_sb(mddev
->bitmap
);
1314 printk("%s: ", mdname(mddev
));
1315 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1316 printk("<%s>", bdevname(rdev
->bdev
,b
));
1319 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1322 printk("md: **********************************\n");
1327 static void sync_sbs(mddev_t
* mddev
)
1330 struct list_head
*tmp
;
1332 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1333 super_types
[mddev
->major_version
].
1334 sync_super(mddev
, rdev
);
1335 rdev
->sb_loaded
= 1;
1339 static void md_update_sb(mddev_t
* mddev
)
1342 struct list_head
*tmp
;
1347 spin_lock(&mddev
->write_lock
);
1348 sync_req
= mddev
->in_sync
;
1349 mddev
->utime
= get_seconds();
1352 if (!mddev
->events
) {
1354 * oops, this 64-bit counter should never wrap.
1355 * Either we are in around ~1 trillion A.C., assuming
1356 * 1 reboot per second, or we have a bug:
1361 mddev
->sb_dirty
= 2;
1365 * do not write anything to disk if using
1366 * nonpersistent superblocks
1368 if (!mddev
->persistent
) {
1369 mddev
->sb_dirty
= 0;
1370 spin_unlock(&mddev
->write_lock
);
1371 wake_up(&mddev
->sb_wait
);
1374 spin_unlock(&mddev
->write_lock
);
1377 "md: updating %s RAID superblock on device (in sync %d)\n",
1378 mdname(mddev
),mddev
->in_sync
);
1380 err
= bitmap_update_sb(mddev
->bitmap
);
1381 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1382 char b
[BDEVNAME_SIZE
];
1383 dprintk(KERN_INFO
"md: ");
1385 dprintk("(skipping faulty ");
1387 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1388 if (!rdev
->faulty
) {
1389 md_super_write(mddev
,rdev
,
1390 rdev
->sb_offset
<<1, rdev
->sb_size
,
1392 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1393 bdevname(rdev
->bdev
,b
),
1394 (unsigned long long)rdev
->sb_offset
);
1398 if (mddev
->level
== LEVEL_MULTIPATH
)
1399 /* only need to write one superblock... */
1402 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
1403 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1405 spin_lock(&mddev
->write_lock
);
1406 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1407 /* have to write it out again */
1408 spin_unlock(&mddev
->write_lock
);
1411 mddev
->sb_dirty
= 0;
1412 spin_unlock(&mddev
->write_lock
);
1413 wake_up(&mddev
->sb_wait
);
1418 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1420 * mark the device faulty if:
1422 * - the device is nonexistent (zero size)
1423 * - the device has no valid superblock
1425 * a faulty rdev _never_ has rdev->sb set.
1427 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1429 char b
[BDEVNAME_SIZE
];
1434 rdev
= (mdk_rdev_t
*) kmalloc(sizeof(*rdev
), GFP_KERNEL
);
1436 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1437 return ERR_PTR(-ENOMEM
);
1439 memset(rdev
, 0, sizeof(*rdev
));
1441 if ((err
= alloc_disk_sb(rdev
)))
1444 err
= lock_rdev(rdev
, newdev
);
1451 rdev
->data_offset
= 0;
1452 atomic_set(&rdev
->nr_pending
, 0);
1454 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1457 "md: %s has zero or unknown size, marking faulty!\n",
1458 bdevname(rdev
->bdev
,b
));
1463 if (super_format
>= 0) {
1464 err
= super_types
[super_format
].
1465 load_super(rdev
, NULL
, super_minor
);
1466 if (err
== -EINVAL
) {
1468 "md: %s has invalid sb, not importing!\n",
1469 bdevname(rdev
->bdev
,b
));
1474 "md: could not read %s's sb, not importing!\n",
1475 bdevname(rdev
->bdev
,b
));
1479 INIT_LIST_HEAD(&rdev
->same_set
);
1484 if (rdev
->sb_page
) {
1490 return ERR_PTR(err
);
1494 * Check a full RAID array for plausibility
1498 static void analyze_sbs(mddev_t
* mddev
)
1501 struct list_head
*tmp
;
1502 mdk_rdev_t
*rdev
, *freshest
;
1503 char b
[BDEVNAME_SIZE
];
1506 ITERATE_RDEV(mddev
,rdev
,tmp
)
1507 switch (super_types
[mddev
->major_version
].
1508 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1516 "md: fatal superblock inconsistency in %s"
1517 " -- removing from array\n",
1518 bdevname(rdev
->bdev
,b
));
1519 kick_rdev_from_array(rdev
);
1523 super_types
[mddev
->major_version
].
1524 validate_super(mddev
, freshest
);
1527 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1528 if (rdev
!= freshest
)
1529 if (super_types
[mddev
->major_version
].
1530 validate_super(mddev
, rdev
)) {
1531 printk(KERN_WARNING
"md: kicking non-fresh %s"
1533 bdevname(rdev
->bdev
,b
));
1534 kick_rdev_from_array(rdev
);
1537 if (mddev
->level
== LEVEL_MULTIPATH
) {
1538 rdev
->desc_nr
= i
++;
1539 rdev
->raid_disk
= rdev
->desc_nr
;
1546 if (mddev
->recovery_cp
!= MaxSector
&&
1548 printk(KERN_ERR
"md: %s: raid array is not clean"
1549 " -- starting background reconstruction\n",
1554 struct md_sysfs_entry
{
1555 struct attribute attr
;
1556 ssize_t (*show
)(mddev_t
*, char *);
1557 ssize_t (*store
)(mddev_t
*, const char *, size_t);
1561 md_show_level(mddev_t
*mddev
, char *page
)
1563 mdk_personality_t
*p
= mddev
->pers
;
1566 if (mddev
->level
>= 0)
1567 return sprintf(page
, "RAID-%d\n", mddev
->level
);
1569 return sprintf(page
, "%s\n", p
->name
);
1572 static struct md_sysfs_entry md_level
= {
1573 .attr
= {.name
= "level", .mode
= S_IRUGO
},
1574 .show
= md_show_level
,
1578 md_show_rdisks(mddev_t
*mddev
, char *page
)
1580 return sprintf(page
, "%d\n", mddev
->raid_disks
);
1583 static struct md_sysfs_entry md_raid_disks
= {
1584 .attr
= {.name
= "raid_disks", .mode
= S_IRUGO
},
1585 .show
= md_show_rdisks
,
1588 static struct attribute
*md_default_attrs
[] = {
1590 &md_raid_disks
.attr
,
1595 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1597 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
1598 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
1602 return entry
->show(mddev
, page
);
1606 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1607 const char *page
, size_t length
)
1609 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
1610 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
1614 return entry
->store(mddev
, page
, length
);
1617 static void md_free(struct kobject
*ko
)
1619 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
1623 static struct sysfs_ops md_sysfs_ops
= {
1624 .show
= md_attr_show
,
1625 .store
= md_attr_store
,
1627 static struct kobj_type md_ktype
= {
1629 .sysfs_ops
= &md_sysfs_ops
,
1630 .default_attrs
= md_default_attrs
,
1635 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
1637 static DECLARE_MUTEX(disks_sem
);
1638 mddev_t
*mddev
= mddev_find(dev
);
1639 struct gendisk
*disk
;
1640 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
1641 int shift
= partitioned
? MdpMinorShift
: 0;
1642 int unit
= MINOR(dev
) >> shift
;
1648 if (mddev
->gendisk
) {
1653 disk
= alloc_disk(1 << shift
);
1659 disk
->major
= MAJOR(dev
);
1660 disk
->first_minor
= unit
<< shift
;
1662 sprintf(disk
->disk_name
, "md_d%d", unit
);
1663 sprintf(disk
->devfs_name
, "md/d%d", unit
);
1665 sprintf(disk
->disk_name
, "md%d", unit
);
1666 sprintf(disk
->devfs_name
, "md/%d", unit
);
1668 disk
->fops
= &md_fops
;
1669 disk
->private_data
= mddev
;
1670 disk
->queue
= mddev
->queue
;
1672 mddev
->gendisk
= disk
;
1674 mddev
->kobj
.parent
= kobject_get(&disk
->kobj
);
1675 mddev
->kobj
.k_name
= NULL
;
1676 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
1677 mddev
->kobj
.ktype
= &md_ktype
;
1678 kobject_register(&mddev
->kobj
);
1682 void md_wakeup_thread(mdk_thread_t
*thread
);
1684 static void md_safemode_timeout(unsigned long data
)
1686 mddev_t
*mddev
= (mddev_t
*) data
;
1688 mddev
->safemode
= 1;
1689 md_wakeup_thread(mddev
->thread
);
1693 static int do_md_run(mddev_t
* mddev
)
1697 struct list_head
*tmp
;
1699 struct gendisk
*disk
;
1700 char b
[BDEVNAME_SIZE
];
1702 if (list_empty(&mddev
->disks
))
1703 /* cannot run an array with no devices.. */
1710 * Analyze all RAID superblock(s)
1712 if (!mddev
->raid_disks
)
1715 chunk_size
= mddev
->chunk_size
;
1716 pnum
= level_to_pers(mddev
->level
);
1718 if ((pnum
!= MULTIPATH
) && (pnum
!= RAID1
)) {
1721 * 'default chunksize' in the old md code used to
1722 * be PAGE_SIZE, baaad.
1723 * we abort here to be on the safe side. We don't
1724 * want to continue the bad practice.
1727 "no chunksize specified, see 'man raidtab'\n");
1730 if (chunk_size
> MAX_CHUNK_SIZE
) {
1731 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
1732 chunk_size
, MAX_CHUNK_SIZE
);
1736 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1738 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
1739 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
1742 if (chunk_size
< PAGE_SIZE
) {
1743 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
1744 chunk_size
, PAGE_SIZE
);
1748 /* devices must have minimum size of one chunk */
1749 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1752 if (rdev
->size
< chunk_size
/ 1024) {
1754 "md: Dev %s smaller than chunk_size:"
1756 bdevname(rdev
->bdev
,b
),
1757 (unsigned long long)rdev
->size
,
1767 request_module("md-personality-%d", pnum
);
1772 * Drop all container device buffers, from now on
1773 * the only valid external interface is through the md
1775 * Also find largest hardsector size
1777 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1780 sync_blockdev(rdev
->bdev
);
1781 invalidate_bdev(rdev
->bdev
, 0);
1784 md_probe(mddev
->unit
, NULL
, NULL
);
1785 disk
= mddev
->gendisk
;
1789 spin_lock(&pers_lock
);
1790 if (!pers
[pnum
] || !try_module_get(pers
[pnum
]->owner
)) {
1791 spin_unlock(&pers_lock
);
1792 printk(KERN_WARNING
"md: personality %d is not loaded!\n",
1797 mddev
->pers
= pers
[pnum
];
1798 spin_unlock(&pers_lock
);
1800 mddev
->recovery
= 0;
1801 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
1803 /* before we start the array running, initialise the bitmap */
1804 err
= bitmap_create(mddev
);
1806 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
1807 mdname(mddev
), err
);
1809 err
= mddev
->pers
->run(mddev
);
1811 printk(KERN_ERR
"md: pers->run() failed ...\n");
1812 module_put(mddev
->pers
->owner
);
1814 bitmap_destroy(mddev
);
1817 atomic_set(&mddev
->writes_pending
,0);
1818 mddev
->safemode
= 0;
1819 mddev
->safemode_timer
.function
= md_safemode_timeout
;
1820 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
1821 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
1824 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
1825 md_wakeup_thread(mddev
->thread
);
1827 if (mddev
->sb_dirty
)
1828 md_update_sb(mddev
);
1830 set_capacity(disk
, mddev
->array_size
<<1);
1832 /* If we call blk_queue_make_request here, it will
1833 * re-initialise max_sectors etc which may have been
1834 * refined inside -> run. So just set the bits we need to set.
1835 * Most initialisation happended when we called
1836 * blk_queue_make_request(..., md_fail_request)
1839 mddev
->queue
->queuedata
= mddev
;
1840 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
1846 static int restart_array(mddev_t
*mddev
)
1848 struct gendisk
*disk
= mddev
->gendisk
;
1852 * Complain if it has no devices
1855 if (list_empty(&mddev
->disks
))
1863 mddev
->safemode
= 0;
1865 set_disk_ro(disk
, 0);
1867 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
1870 * Kick recovery or resync if necessary
1872 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
1873 md_wakeup_thread(mddev
->thread
);
1876 printk(KERN_ERR
"md: %s has no personality assigned.\n",
1885 static int do_md_stop(mddev_t
* mddev
, int ro
)
1888 struct gendisk
*disk
= mddev
->gendisk
;
1891 if (atomic_read(&mddev
->active
)>2) {
1892 printk("md: %s still in use.\n",mdname(mddev
));
1896 if (mddev
->sync_thread
) {
1897 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
1898 md_unregister_thread(mddev
->sync_thread
);
1899 mddev
->sync_thread
= NULL
;
1902 del_timer_sync(&mddev
->safemode_timer
);
1904 invalidate_partition(disk
, 0);
1912 bitmap_flush(mddev
);
1913 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
1915 set_disk_ro(disk
, 0);
1916 blk_queue_make_request(mddev
->queue
, md_fail_request
);
1917 mddev
->pers
->stop(mddev
);
1918 module_put(mddev
->pers
->owner
);
1923 if (!mddev
->in_sync
) {
1924 /* mark array as shutdown cleanly */
1926 md_update_sb(mddev
);
1929 set_disk_ro(disk
, 1);
1932 bitmap_destroy(mddev
);
1933 if (mddev
->bitmap_file
) {
1934 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
1935 fput(mddev
->bitmap_file
);
1936 mddev
->bitmap_file
= NULL
;
1938 mddev
->bitmap_offset
= 0;
1941 * Free resources if final stop
1944 struct gendisk
*disk
;
1945 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
1947 export_array(mddev
);
1949 mddev
->array_size
= 0;
1950 disk
= mddev
->gendisk
;
1952 set_capacity(disk
, 0);
1955 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
1962 static void autorun_array(mddev_t
*mddev
)
1965 struct list_head
*tmp
;
1968 if (list_empty(&mddev
->disks
))
1971 printk(KERN_INFO
"md: running: ");
1973 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1974 char b
[BDEVNAME_SIZE
];
1975 printk("<%s>", bdevname(rdev
->bdev
,b
));
1979 err
= do_md_run (mddev
);
1981 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
1982 do_md_stop (mddev
, 0);
1987 * lets try to run arrays based on all disks that have arrived
1988 * until now. (those are in pending_raid_disks)
1990 * the method: pick the first pending disk, collect all disks with
1991 * the same UUID, remove all from the pending list and put them into
1992 * the 'same_array' list. Then order this list based on superblock
1993 * update time (freshest comes first), kick out 'old' disks and
1994 * compare superblocks. If everything's fine then run it.
1996 * If "unit" is allocated, then bump its reference count
1998 static void autorun_devices(int part
)
2000 struct list_head candidates
;
2001 struct list_head
*tmp
;
2002 mdk_rdev_t
*rdev0
, *rdev
;
2004 char b
[BDEVNAME_SIZE
];
2006 printk(KERN_INFO
"md: autorun ...\n");
2007 while (!list_empty(&pending_raid_disks
)) {
2009 rdev0
= list_entry(pending_raid_disks
.next
,
2010 mdk_rdev_t
, same_set
);
2012 printk(KERN_INFO
"md: considering %s ...\n",
2013 bdevname(rdev0
->bdev
,b
));
2014 INIT_LIST_HEAD(&candidates
);
2015 ITERATE_RDEV_PENDING(rdev
,tmp
)
2016 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
2017 printk(KERN_INFO
"md: adding %s ...\n",
2018 bdevname(rdev
->bdev
,b
));
2019 list_move(&rdev
->same_set
, &candidates
);
2022 * now we have a set of devices, with all of them having
2023 * mostly sane superblocks. It's time to allocate the
2026 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
2027 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
2028 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
2032 dev
= MKDEV(mdp_major
,
2033 rdev0
->preferred_minor
<< MdpMinorShift
);
2035 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
2037 md_probe(dev
, NULL
, NULL
);
2038 mddev
= mddev_find(dev
);
2041 "md: cannot allocate memory for md drive.\n");
2044 if (mddev_lock(mddev
))
2045 printk(KERN_WARNING
"md: %s locked, cannot run\n",
2047 else if (mddev
->raid_disks
|| mddev
->major_version
2048 || !list_empty(&mddev
->disks
)) {
2050 "md: %s already running, cannot run %s\n",
2051 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
2052 mddev_unlock(mddev
);
2054 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
2055 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
2056 list_del_init(&rdev
->same_set
);
2057 if (bind_rdev_to_array(rdev
, mddev
))
2060 autorun_array(mddev
);
2061 mddev_unlock(mddev
);
2063 /* on success, candidates will be empty, on error
2066 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
2070 printk(KERN_INFO
"md: ... autorun DONE.\n");
2074 * import RAID devices based on one partition
2075 * if possible, the array gets run as well.
2078 static int autostart_array(dev_t startdev
)
2080 char b
[BDEVNAME_SIZE
];
2081 int err
= -EINVAL
, i
;
2082 mdp_super_t
*sb
= NULL
;
2083 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
2085 start_rdev
= md_import_device(startdev
, 0, 0);
2086 if (IS_ERR(start_rdev
))
2090 /* NOTE: this can only work for 0.90.0 superblocks */
2091 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
2092 if (sb
->major_version
!= 0 ||
2093 sb
->minor_version
!= 90 ) {
2094 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
2095 export_rdev(start_rdev
);
2099 if (start_rdev
->faulty
) {
2101 "md: can not autostart based on faulty %s!\n",
2102 bdevname(start_rdev
->bdev
,b
));
2103 export_rdev(start_rdev
);
2106 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
2108 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2109 mdp_disk_t
*desc
= sb
->disks
+ i
;
2110 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
2114 if (dev
== startdev
)
2116 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
2118 rdev
= md_import_device(dev
, 0, 0);
2122 list_add(&rdev
->same_set
, &pending_raid_disks
);
2126 * possibly return codes
2134 static int get_version(void __user
* arg
)
2138 ver
.major
= MD_MAJOR_VERSION
;
2139 ver
.minor
= MD_MINOR_VERSION
;
2140 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
2142 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
2148 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
2150 mdu_array_info_t info
;
2151 int nr
,working
,active
,failed
,spare
;
2153 struct list_head
*tmp
;
2155 nr
=working
=active
=failed
=spare
=0;
2156 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2169 info
.major_version
= mddev
->major_version
;
2170 info
.minor_version
= mddev
->minor_version
;
2171 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
2172 info
.ctime
= mddev
->ctime
;
2173 info
.level
= mddev
->level
;
2174 info
.size
= mddev
->size
;
2176 info
.raid_disks
= mddev
->raid_disks
;
2177 info
.md_minor
= mddev
->md_minor
;
2178 info
.not_persistent
= !mddev
->persistent
;
2180 info
.utime
= mddev
->utime
;
2183 info
.state
= (1<<MD_SB_CLEAN
);
2184 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2185 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
2186 info
.active_disks
= active
;
2187 info
.working_disks
= working
;
2188 info
.failed_disks
= failed
;
2189 info
.spare_disks
= spare
;
2191 info
.layout
= mddev
->layout
;
2192 info
.chunk_size
= mddev
->chunk_size
;
2194 if (copy_to_user(arg
, &info
, sizeof(info
)))
2200 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
2202 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
2203 char *ptr
, *buf
= NULL
;
2206 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
2210 /* bitmap disabled, zero the first byte and copy out */
2211 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
2212 file
->pathname
[0] = '\0';
2216 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
2220 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
2224 strcpy(file
->pathname
, ptr
);
2228 if (copy_to_user(arg
, file
, sizeof(*file
)))
2236 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
2238 mdu_disk_info_t info
;
2242 if (copy_from_user(&info
, arg
, sizeof(info
)))
2247 rdev
= find_rdev_nr(mddev
, nr
);
2249 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
2250 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
2251 info
.raid_disk
= rdev
->raid_disk
;
2254 info
.state
|= (1<<MD_DISK_FAULTY
);
2255 else if (rdev
->in_sync
) {
2256 info
.state
|= (1<<MD_DISK_ACTIVE
);
2257 info
.state
|= (1<<MD_DISK_SYNC
);
2259 if (test_bit(WriteMostly
, &rdev
->flags
))
2260 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
2262 info
.major
= info
.minor
= 0;
2263 info
.raid_disk
= -1;
2264 info
.state
= (1<<MD_DISK_REMOVED
);
2267 if (copy_to_user(arg
, &info
, sizeof(info
)))
2273 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
2275 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
2277 dev_t dev
= MKDEV(info
->major
,info
->minor
);
2279 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
2282 if (!mddev
->raid_disks
) {
2284 /* expecting a device which has a superblock */
2285 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
2288 "md: md_import_device returned %ld\n",
2290 return PTR_ERR(rdev
);
2292 if (!list_empty(&mddev
->disks
)) {
2293 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2294 mdk_rdev_t
, same_set
);
2295 int err
= super_types
[mddev
->major_version
]
2296 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2299 "md: %s has different UUID to %s\n",
2300 bdevname(rdev
->bdev
,b
),
2301 bdevname(rdev0
->bdev
,b2
));
2306 err
= bind_rdev_to_array(rdev
, mddev
);
2313 * add_new_disk can be used once the array is assembled
2314 * to add "hot spares". They must already have a superblock
2319 if (!mddev
->pers
->hot_add_disk
) {
2321 "%s: personality does not support diskops!\n",
2325 if (mddev
->persistent
)
2326 rdev
= md_import_device(dev
, mddev
->major_version
,
2327 mddev
->minor_version
);
2329 rdev
= md_import_device(dev
, -1, -1);
2332 "md: md_import_device returned %ld\n",
2334 return PTR_ERR(rdev
);
2336 /* set save_raid_disk if appropriate */
2337 if (!mddev
->persistent
) {
2338 if (info
->state
& (1<<MD_DISK_SYNC
) &&
2339 info
->raid_disk
< mddev
->raid_disks
)
2340 rdev
->raid_disk
= info
->raid_disk
;
2342 rdev
->raid_disk
= -1;
2344 super_types
[mddev
->major_version
].
2345 validate_super(mddev
, rdev
);
2346 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2348 rdev
->in_sync
= 0; /* just to be sure */
2349 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2350 set_bit(WriteMostly
, &rdev
->flags
);
2352 rdev
->raid_disk
= -1;
2353 err
= bind_rdev_to_array(rdev
, mddev
);
2357 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2358 md_wakeup_thread(mddev
->thread
);
2362 /* otherwise, add_new_disk is only allowed
2363 * for major_version==0 superblocks
2365 if (mddev
->major_version
!= 0) {
2366 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
2371 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
2373 rdev
= md_import_device (dev
, -1, 0);
2376 "md: error, md_import_device() returned %ld\n",
2378 return PTR_ERR(rdev
);
2380 rdev
->desc_nr
= info
->number
;
2381 if (info
->raid_disk
< mddev
->raid_disks
)
2382 rdev
->raid_disk
= info
->raid_disk
;
2384 rdev
->raid_disk
= -1;
2387 if (rdev
->raid_disk
< mddev
->raid_disks
)
2388 rdev
->in_sync
= (info
->state
& (1<<MD_DISK_SYNC
));
2392 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2393 set_bit(WriteMostly
, &rdev
->flags
);
2395 err
= bind_rdev_to_array(rdev
, mddev
);
2401 if (!mddev
->persistent
) {
2402 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
2403 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2405 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2406 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2408 if (!mddev
->size
|| (mddev
->size
> rdev
->size
))
2409 mddev
->size
= rdev
->size
;
2415 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
2417 char b
[BDEVNAME_SIZE
];
2423 rdev
= find_rdev(mddev
, dev
);
2427 if (rdev
->raid_disk
>= 0)
2430 kick_rdev_from_array(rdev
);
2431 md_update_sb(mddev
);
2435 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
2436 bdevname(rdev
->bdev
,b
), mdname(mddev
));
2440 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
2442 char b
[BDEVNAME_SIZE
];
2450 if (mddev
->major_version
!= 0) {
2451 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
2452 " version-0 superblocks.\n",
2456 if (!mddev
->pers
->hot_add_disk
) {
2458 "%s: personality does not support diskops!\n",
2463 rdev
= md_import_device (dev
, -1, 0);
2466 "md: error, md_import_device() returned %ld\n",
2471 if (mddev
->persistent
)
2472 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2475 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2477 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2480 if (size
< mddev
->size
) {
2482 "%s: disk size %llu blocks < array size %llu\n",
2483 mdname(mddev
), (unsigned long long)size
,
2484 (unsigned long long)mddev
->size
);
2491 "md: can not hot-add faulty %s disk to %s!\n",
2492 bdevname(rdev
->bdev
,b
), mdname(mddev
));
2498 bind_rdev_to_array(rdev
, mddev
);
2501 * The rest should better be atomic, we can have disk failures
2502 * noticed in interrupt contexts ...
2505 if (rdev
->desc_nr
== mddev
->max_disks
) {
2506 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
2509 goto abort_unbind_export
;
2512 rdev
->raid_disk
= -1;
2514 md_update_sb(mddev
);
2517 * Kick recovery, maybe this spare has to be added to the
2518 * array immediately.
2520 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2521 md_wakeup_thread(mddev
->thread
);
2525 abort_unbind_export
:
2526 unbind_rdev_from_array(rdev
);
2533 /* similar to deny_write_access, but accounts for our holding a reference
2534 * to the file ourselves */
2535 static int deny_bitmap_write_access(struct file
* file
)
2537 struct inode
*inode
= file
->f_mapping
->host
;
2539 spin_lock(&inode
->i_lock
);
2540 if (atomic_read(&inode
->i_writecount
) > 1) {
2541 spin_unlock(&inode
->i_lock
);
2544 atomic_set(&inode
->i_writecount
, -1);
2545 spin_unlock(&inode
->i_lock
);
2550 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
2555 if (!mddev
->pers
->quiesce
)
2557 if (mddev
->recovery
|| mddev
->sync_thread
)
2559 /* we should be able to change the bitmap.. */
2565 return -EEXIST
; /* cannot add when bitmap is present */
2566 mddev
->bitmap_file
= fget(fd
);
2568 if (mddev
->bitmap_file
== NULL
) {
2569 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
2574 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
2576 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
2578 fput(mddev
->bitmap_file
);
2579 mddev
->bitmap_file
= NULL
;
2582 mddev
->bitmap_offset
= 0; /* file overrides offset */
2583 } else if (mddev
->bitmap
== NULL
)
2584 return -ENOENT
; /* cannot remove what isn't there */
2587 mddev
->pers
->quiesce(mddev
, 1);
2589 err
= bitmap_create(mddev
);
2591 bitmap_destroy(mddev
);
2592 mddev
->pers
->quiesce(mddev
, 0);
2593 } else if (fd
< 0) {
2594 if (mddev
->bitmap_file
)
2595 fput(mddev
->bitmap_file
);
2596 mddev
->bitmap_file
= NULL
;
2603 * set_array_info is used two different ways
2604 * The original usage is when creating a new array.
2605 * In this usage, raid_disks is > 0 and it together with
2606 * level, size, not_persistent,layout,chunksize determine the
2607 * shape of the array.
2608 * This will always create an array with a type-0.90.0 superblock.
2609 * The newer usage is when assembling an array.
2610 * In this case raid_disks will be 0, and the major_version field is
2611 * use to determine which style super-blocks are to be found on the devices.
2612 * The minor and patch _version numbers are also kept incase the
2613 * super_block handler wishes to interpret them.
2615 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
2618 if (info
->raid_disks
== 0) {
2619 /* just setting version number for superblock loading */
2620 if (info
->major_version
< 0 ||
2621 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2622 super_types
[info
->major_version
].name
== NULL
) {
2623 /* maybe try to auto-load a module? */
2625 "md: superblock version %d not known\n",
2626 info
->major_version
);
2629 mddev
->major_version
= info
->major_version
;
2630 mddev
->minor_version
= info
->minor_version
;
2631 mddev
->patch_version
= info
->patch_version
;
2634 mddev
->major_version
= MD_MAJOR_VERSION
;
2635 mddev
->minor_version
= MD_MINOR_VERSION
;
2636 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
2637 mddev
->ctime
= get_seconds();
2639 mddev
->level
= info
->level
;
2640 mddev
->size
= info
->size
;
2641 mddev
->raid_disks
= info
->raid_disks
;
2642 /* don't set md_minor, it is determined by which /dev/md* was
2645 if (info
->state
& (1<<MD_SB_CLEAN
))
2646 mddev
->recovery_cp
= MaxSector
;
2648 mddev
->recovery_cp
= 0;
2649 mddev
->persistent
= ! info
->not_persistent
;
2651 mddev
->layout
= info
->layout
;
2652 mddev
->chunk_size
= info
->chunk_size
;
2654 mddev
->max_disks
= MD_SB_DISKS
;
2656 mddev
->sb_dirty
= 1;
2659 * Generate a 128 bit UUID
2661 get_random_bytes(mddev
->uuid
, 16);
2667 * update_array_info is used to change the configuration of an
2669 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2670 * fields in the info are checked against the array.
2671 * Any differences that cannot be handled will cause an error.
2672 * Normally, only one change can be managed at a time.
2674 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
2680 /* calculate expected state,ignoring low bits */
2681 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2682 state
|= (1 << MD_SB_BITMAP_PRESENT
);
2684 if (mddev
->major_version
!= info
->major_version
||
2685 mddev
->minor_version
!= info
->minor_version
||
2686 /* mddev->patch_version != info->patch_version || */
2687 mddev
->ctime
!= info
->ctime
||
2688 mddev
->level
!= info
->level
||
2689 /* mddev->layout != info->layout || */
2690 !mddev
->persistent
!= info
->not_persistent
||
2691 mddev
->chunk_size
!= info
->chunk_size
||
2692 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2693 ((state
^info
->state
) & 0xfffffe00)
2696 /* Check there is only one change */
2697 if (mddev
->size
!= info
->size
) cnt
++;
2698 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
2699 if (mddev
->layout
!= info
->layout
) cnt
++;
2700 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
2701 if (cnt
== 0) return 0;
2702 if (cnt
> 1) return -EINVAL
;
2704 if (mddev
->layout
!= info
->layout
) {
2706 * we don't need to do anything at the md level, the
2707 * personality will take care of it all.
2709 if (mddev
->pers
->reconfig
== NULL
)
2712 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
2714 if (mddev
->size
!= info
->size
) {
2716 struct list_head
*tmp
;
2717 if (mddev
->pers
->resize
== NULL
)
2719 /* The "size" is the amount of each device that is used.
2720 * This can only make sense for arrays with redundancy.
2721 * linear and raid0 always use whatever space is available
2722 * We can only consider changing the size if no resync
2723 * or reconstruction is happening, and if the new size
2724 * is acceptable. It must fit before the sb_offset or,
2725 * if that is <data_offset, it must fit before the
2726 * size of each device.
2727 * If size is zero, we find the largest size that fits.
2729 if (mddev
->sync_thread
)
2731 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2733 int fit
= (info
->size
== 0);
2734 if (rdev
->sb_offset
> rdev
->data_offset
)
2735 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
2737 avail
= get_capacity(rdev
->bdev
->bd_disk
)
2738 - rdev
->data_offset
;
2739 if (fit
&& (info
->size
== 0 || info
->size
> avail
/2))
2740 info
->size
= avail
/2;
2741 if (avail
< ((sector_t
)info
->size
<< 1))
2744 rv
= mddev
->pers
->resize(mddev
, (sector_t
)info
->size
*2);
2746 struct block_device
*bdev
;
2748 bdev
= bdget_disk(mddev
->gendisk
, 0);
2750 down(&bdev
->bd_inode
->i_sem
);
2751 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
2752 up(&bdev
->bd_inode
->i_sem
);
2757 if (mddev
->raid_disks
!= info
->raid_disks
) {
2758 /* change the number of raid disks */
2759 if (mddev
->pers
->reshape
== NULL
)
2761 if (info
->raid_disks
<= 0 ||
2762 info
->raid_disks
>= mddev
->max_disks
)
2764 if (mddev
->sync_thread
)
2766 rv
= mddev
->pers
->reshape(mddev
, info
->raid_disks
);
2768 struct block_device
*bdev
;
2770 bdev
= bdget_disk(mddev
->gendisk
, 0);
2772 down(&bdev
->bd_inode
->i_sem
);
2773 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
2774 up(&bdev
->bd_inode
->i_sem
);
2779 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
2780 if (mddev
->pers
->quiesce
== NULL
)
2782 if (mddev
->recovery
|| mddev
->sync_thread
)
2784 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
2785 /* add the bitmap */
2788 if (mddev
->default_bitmap_offset
== 0)
2790 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
2791 mddev
->pers
->quiesce(mddev
, 1);
2792 rv
= bitmap_create(mddev
);
2794 bitmap_destroy(mddev
);
2795 mddev
->pers
->quiesce(mddev
, 0);
2797 /* remove the bitmap */
2800 if (mddev
->bitmap
->file
)
2802 mddev
->pers
->quiesce(mddev
, 1);
2803 bitmap_destroy(mddev
);
2804 mddev
->pers
->quiesce(mddev
, 0);
2805 mddev
->bitmap_offset
= 0;
2808 md_update_sb(mddev
);
2812 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
2816 if (mddev
->pers
== NULL
)
2819 rdev
= find_rdev(mddev
, dev
);
2823 md_error(mddev
, rdev
);
2827 static int md_ioctl(struct inode
*inode
, struct file
*file
,
2828 unsigned int cmd
, unsigned long arg
)
2831 void __user
*argp
= (void __user
*)arg
;
2832 struct hd_geometry __user
*loc
= argp
;
2833 mddev_t
*mddev
= NULL
;
2835 if (!capable(CAP_SYS_ADMIN
))
2839 * Commands dealing with the RAID driver but not any
2845 err
= get_version(argp
);
2848 case PRINT_RAID_DEBUG
:
2856 autostart_arrays(arg
);
2863 * Commands creating/starting a new array:
2866 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
2874 if (cmd
== START_ARRAY
) {
2875 /* START_ARRAY doesn't need to lock the array as autostart_array
2876 * does the locking, and it could even be a different array
2881 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
2882 "This will not be supported beyond 2.6\n",
2883 current
->comm
, current
->pid
);
2886 err
= autostart_array(new_decode_dev(arg
));
2888 printk(KERN_WARNING
"md: autostart failed!\n");
2894 err
= mddev_lock(mddev
);
2897 "md: ioctl lock interrupted, reason %d, cmd %d\n",
2904 case SET_ARRAY_INFO
:
2906 mdu_array_info_t info
;
2908 memset(&info
, 0, sizeof(info
));
2909 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
2914 err
= update_array_info(mddev
, &info
);
2916 printk(KERN_WARNING
"md: couldn't update"
2917 " array info. %d\n", err
);
2922 if (!list_empty(&mddev
->disks
)) {
2924 "md: array %s already has disks!\n",
2929 if (mddev
->raid_disks
) {
2931 "md: array %s already initialised!\n",
2936 err
= set_array_info(mddev
, &info
);
2938 printk(KERN_WARNING
"md: couldn't set"
2939 " array info. %d\n", err
);
2949 * Commands querying/configuring an existing array:
2951 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
2952 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
2953 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
2954 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
2960 * Commands even a read-only array can execute:
2964 case GET_ARRAY_INFO
:
2965 err
= get_array_info(mddev
, argp
);
2968 case GET_BITMAP_FILE
:
2969 err
= get_bitmap_file(mddev
, argp
);
2973 err
= get_disk_info(mddev
, argp
);
2976 case RESTART_ARRAY_RW
:
2977 err
= restart_array(mddev
);
2981 err
= do_md_stop (mddev
, 0);
2985 err
= do_md_stop (mddev
, 1);
2989 * We have a problem here : there is no easy way to give a CHS
2990 * virtual geometry. We currently pretend that we have a 2 heads
2991 * 4 sectors (with a BIG number of cylinders...). This drives
2992 * dosfs just mad... ;-)
2999 err
= put_user (2, (char __user
*) &loc
->heads
);
3002 err
= put_user (4, (char __user
*) &loc
->sectors
);
3005 err
= put_user(get_capacity(mddev
->gendisk
)/8,
3006 (short __user
*) &loc
->cylinders
);
3009 err
= put_user (get_start_sect(inode
->i_bdev
),
3010 (long __user
*) &loc
->start
);
3015 * The remaining ioctls are changing the state of the
3016 * superblock, so we do not allow read-only arrays
3028 mdu_disk_info_t info
;
3029 if (copy_from_user(&info
, argp
, sizeof(info
)))
3032 err
= add_new_disk(mddev
, &info
);
3036 case HOT_REMOVE_DISK
:
3037 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
3041 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
3044 case SET_DISK_FAULTY
:
3045 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
3049 err
= do_md_run (mddev
);
3052 case SET_BITMAP_FILE
:
3053 err
= set_bitmap_file(mddev
, (int)arg
);
3057 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
3058 printk(KERN_WARNING
"md: %s(pid %d) used"
3059 " obsolete MD ioctl, upgrade your"
3060 " software to use new ictls.\n",
3061 current
->comm
, current
->pid
);
3068 mddev_unlock(mddev
);
3078 static int md_open(struct inode
*inode
, struct file
*file
)
3081 * Succeed if we can lock the mddev, which confirms that
3082 * it isn't being stopped right now.
3084 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3087 if ((err
= mddev_lock(mddev
)))
3092 mddev_unlock(mddev
);
3094 check_disk_change(inode
->i_bdev
);
3099 static int md_release(struct inode
*inode
, struct file
* file
)
3101 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3110 static int md_media_changed(struct gendisk
*disk
)
3112 mddev_t
*mddev
= disk
->private_data
;
3114 return mddev
->changed
;
3117 static int md_revalidate(struct gendisk
*disk
)
3119 mddev_t
*mddev
= disk
->private_data
;
3124 static struct block_device_operations md_fops
=
3126 .owner
= THIS_MODULE
,
3128 .release
= md_release
,
3130 .media_changed
= md_media_changed
,
3131 .revalidate_disk
= md_revalidate
,
3134 static int md_thread(void * arg
)
3136 mdk_thread_t
*thread
= arg
;
3139 * md_thread is a 'system-thread', it's priority should be very
3140 * high. We avoid resource deadlocks individually in each
3141 * raid personality. (RAID5 does preallocation) We also use RR and
3142 * the very same RT priority as kswapd, thus we will never get
3143 * into a priority inversion deadlock.
3145 * we definitely have to have equal or higher priority than
3146 * bdflush, otherwise bdflush will deadlock if there are too
3147 * many dirty RAID5 blocks.
3150 allow_signal(SIGKILL
);
3151 complete(thread
->event
);
3152 while (!kthread_should_stop()) {
3153 void (*run
)(mddev_t
*);
3155 wait_event_interruptible_timeout(thread
->wqueue
,
3156 test_bit(THREAD_WAKEUP
, &thread
->flags
)
3157 || kthread_should_stop(),
3161 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
3171 void md_wakeup_thread(mdk_thread_t
*thread
)
3174 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
3175 set_bit(THREAD_WAKEUP
, &thread
->flags
);
3176 wake_up(&thread
->wqueue
);
3180 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
3183 mdk_thread_t
*thread
;
3184 struct completion event
;
3186 thread
= kmalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
3190 memset(thread
, 0, sizeof(mdk_thread_t
));
3191 init_waitqueue_head(&thread
->wqueue
);
3193 init_completion(&event
);
3194 thread
->event
= &event
;
3196 thread
->mddev
= mddev
;
3197 thread
->name
= name
;
3198 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
3199 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
3200 if (IS_ERR(thread
->tsk
)) {
3204 wait_for_completion(&event
);
3208 void md_unregister_thread(mdk_thread_t
*thread
)
3210 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
3212 kthread_stop(thread
->tsk
);
3216 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
3223 if (!rdev
|| rdev
->faulty
)
3226 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3228 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3229 __builtin_return_address(0),__builtin_return_address(1),
3230 __builtin_return_address(2),__builtin_return_address(3));
3232 if (!mddev
->pers
->error_handler
)
3234 mddev
->pers
->error_handler(mddev
,rdev
);
3235 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3236 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3237 md_wakeup_thread(mddev
->thread
);
3240 /* seq_file implementation /proc/mdstat */
3242 static void status_unused(struct seq_file
*seq
)
3246 struct list_head
*tmp
;
3248 seq_printf(seq
, "unused devices: ");
3250 ITERATE_RDEV_PENDING(rdev
,tmp
) {
3251 char b
[BDEVNAME_SIZE
];
3253 seq_printf(seq
, "%s ",
3254 bdevname(rdev
->bdev
,b
));
3257 seq_printf(seq
, "<none>");
3259 seq_printf(seq
, "\n");
3263 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
3265 unsigned long max_blocks
, resync
, res
, dt
, db
, rt
;
3267 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
3269 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3270 max_blocks
= mddev
->resync_max_sectors
>> 1;
3272 max_blocks
= mddev
->size
;
3275 * Should not happen.
3281 res
= (resync
/1024)*1000/(max_blocks
/1024 + 1);
3283 int i
, x
= res
/50, y
= 20-x
;
3284 seq_printf(seq
, "[");
3285 for (i
= 0; i
< x
; i
++)
3286 seq_printf(seq
, "=");
3287 seq_printf(seq
, ">");
3288 for (i
= 0; i
< y
; i
++)
3289 seq_printf(seq
, ".");
3290 seq_printf(seq
, "] ");
3292 seq_printf(seq
, " %s =%3lu.%lu%% (%lu/%lu)",
3293 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
3294 "resync" : "recovery"),
3295 res
/10, res
% 10, resync
, max_blocks
);
3298 * We do not want to overflow, so the order of operands and
3299 * the * 100 / 100 trick are important. We do a +1 to be
3300 * safe against division by zero. We only estimate anyway.
3302 * dt: time from mark until now
3303 * db: blocks written from mark until now
3304 * rt: remaining time
3306 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
3308 db
= resync
- (mddev
->resync_mark_cnt
/2);
3309 rt
= (dt
* ((max_blocks
-resync
) / (db
/100+1)))/100;
3311 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
3313 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
3316 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3318 struct list_head
*tmp
;
3328 spin_lock(&all_mddevs_lock
);
3329 list_for_each(tmp
,&all_mddevs
)
3331 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
3333 spin_unlock(&all_mddevs_lock
);
3336 spin_unlock(&all_mddevs_lock
);
3338 return (void*)2;/* tail */
3342 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3344 struct list_head
*tmp
;
3345 mddev_t
*next_mddev
, *mddev
= v
;
3351 spin_lock(&all_mddevs_lock
);
3353 tmp
= all_mddevs
.next
;
3355 tmp
= mddev
->all_mddevs
.next
;
3356 if (tmp
!= &all_mddevs
)
3357 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
3359 next_mddev
= (void*)2;
3362 spin_unlock(&all_mddevs_lock
);
3370 static void md_seq_stop(struct seq_file
*seq
, void *v
)
3374 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
3378 static int md_seq_show(struct seq_file
*seq
, void *v
)
3382 struct list_head
*tmp2
;
3385 struct bitmap
*bitmap
;
3387 if (v
== (void*)1) {
3388 seq_printf(seq
, "Personalities : ");
3389 spin_lock(&pers_lock
);
3390 for (i
= 0; i
< MAX_PERSONALITY
; i
++)
3392 seq_printf(seq
, "[%s] ", pers
[i
]->name
);
3394 spin_unlock(&pers_lock
);
3395 seq_printf(seq
, "\n");
3398 if (v
== (void*)2) {
3403 if (mddev_lock(mddev
)!=0)
3405 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
3406 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
3407 mddev
->pers
? "" : "in");
3410 seq_printf(seq
, " (read-only)");
3411 seq_printf(seq
, " %s", mddev
->pers
->name
);
3415 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
3416 char b
[BDEVNAME_SIZE
];
3417 seq_printf(seq
, " %s[%d]",
3418 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
3419 if (test_bit(WriteMostly
, &rdev
->flags
))
3420 seq_printf(seq
, "(W)");
3422 seq_printf(seq
, "(F)");
3424 } else if (rdev
->raid_disk
< 0)
3425 seq_printf(seq
, "(S)"); /* spare */
3429 if (!list_empty(&mddev
->disks
)) {
3431 seq_printf(seq
, "\n %llu blocks",
3432 (unsigned long long)mddev
->array_size
);
3434 seq_printf(seq
, "\n %llu blocks",
3435 (unsigned long long)size
);
3437 if (mddev
->persistent
) {
3438 if (mddev
->major_version
!= 0 ||
3439 mddev
->minor_version
!= 90) {
3440 seq_printf(seq
," super %d.%d",
3441 mddev
->major_version
,
3442 mddev
->minor_version
);
3445 seq_printf(seq
, " super non-persistent");
3448 mddev
->pers
->status (seq
, mddev
);
3449 seq_printf(seq
, "\n ");
3450 if (mddev
->curr_resync
> 2) {
3451 status_resync (seq
, mddev
);
3452 seq_printf(seq
, "\n ");
3453 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
3454 seq_printf(seq
, " resync=DELAYED\n ");
3456 seq_printf(seq
, "\n ");
3458 if ((bitmap
= mddev
->bitmap
)) {
3459 unsigned long chunk_kb
;
3460 unsigned long flags
;
3461 spin_lock_irqsave(&bitmap
->lock
, flags
);
3462 chunk_kb
= bitmap
->chunksize
>> 10;
3463 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
3465 bitmap
->pages
- bitmap
->missing_pages
,
3467 (bitmap
->pages
- bitmap
->missing_pages
)
3468 << (PAGE_SHIFT
- 10),
3469 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
3470 chunk_kb
? "KB" : "B");
3472 seq_printf(seq
, ", file: ");
3473 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
3474 bitmap
->file
->f_dentry
," \t\n");
3477 seq_printf(seq
, "\n");
3478 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
3481 seq_printf(seq
, "\n");
3483 mddev_unlock(mddev
);
3488 static struct seq_operations md_seq_ops
= {
3489 .start
= md_seq_start
,
3490 .next
= md_seq_next
,
3491 .stop
= md_seq_stop
,
3492 .show
= md_seq_show
,
3495 static int md_seq_open(struct inode
*inode
, struct file
*file
)
3499 error
= seq_open(file
, &md_seq_ops
);
3503 static struct file_operations md_seq_fops
= {
3504 .open
= md_seq_open
,
3506 .llseek
= seq_lseek
,
3507 .release
= seq_release
,
3510 int register_md_personality(int pnum
, mdk_personality_t
*p
)
3512 if (pnum
>= MAX_PERSONALITY
) {
3514 "md: tried to install personality %s as nr %d, but max is %lu\n",
3515 p
->name
, pnum
, MAX_PERSONALITY
-1);
3519 spin_lock(&pers_lock
);
3521 spin_unlock(&pers_lock
);
3526 printk(KERN_INFO
"md: %s personality registered as nr %d\n", p
->name
, pnum
);
3527 spin_unlock(&pers_lock
);
3531 int unregister_md_personality(int pnum
)
3533 if (pnum
>= MAX_PERSONALITY
)
3536 printk(KERN_INFO
"md: %s personality unregistered\n", pers
[pnum
]->name
);
3537 spin_lock(&pers_lock
);
3539 spin_unlock(&pers_lock
);
3543 static int is_mddev_idle(mddev_t
*mddev
)
3546 struct list_head
*tmp
;
3548 unsigned long curr_events
;
3551 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3552 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
3553 curr_events
= disk_stat_read(disk
, sectors
[0]) +
3554 disk_stat_read(disk
, sectors
[1]) -
3555 atomic_read(&disk
->sync_io
);
3556 /* Allow some slack between valud of curr_events and last_events,
3557 * as there are some uninteresting races.
3558 * Note: the following is an unsigned comparison.
3560 if ((curr_events
- rdev
->last_events
+ 32) > 64) {
3561 rdev
->last_events
= curr_events
;
3568 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
3570 /* another "blocks" (512byte) blocks have been synced */
3571 atomic_sub(blocks
, &mddev
->recovery_active
);
3572 wake_up(&mddev
->recovery_wait
);
3574 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
3575 md_wakeup_thread(mddev
->thread
);
3576 // stop recovery, signal do_sync ....
3581 /* md_write_start(mddev, bi)
3582 * If we need to update some array metadata (e.g. 'active' flag
3583 * in superblock) before writing, schedule a superblock update
3584 * and wait for it to complete.
3586 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
3588 if (bio_data_dir(bi
) != WRITE
)
3591 atomic_inc(&mddev
->writes_pending
);
3592 if (mddev
->in_sync
) {
3593 spin_lock(&mddev
->write_lock
);
3594 if (mddev
->in_sync
) {
3596 mddev
->sb_dirty
= 1;
3597 md_wakeup_thread(mddev
->thread
);
3599 spin_unlock(&mddev
->write_lock
);
3601 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
3604 void md_write_end(mddev_t
*mddev
)
3606 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
3607 if (mddev
->safemode
== 2)
3608 md_wakeup_thread(mddev
->thread
);
3610 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
3614 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
3616 #define SYNC_MARKS 10
3617 #define SYNC_MARK_STEP (3*HZ)
3618 static void md_do_sync(mddev_t
*mddev
)
3621 unsigned int currspeed
= 0,
3623 sector_t max_sectors
,j
, io_sectors
;
3624 unsigned long mark
[SYNC_MARKS
];
3625 sector_t mark_cnt
[SYNC_MARKS
];
3627 struct list_head
*tmp
;
3628 sector_t last_check
;
3631 /* just incase thread restarts... */
3632 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
3635 /* we overload curr_resync somewhat here.
3636 * 0 == not engaged in resync at all
3637 * 2 == checking that there is no conflict with another sync
3638 * 1 == like 2, but have yielded to allow conflicting resync to
3640 * other == active in resync - this many blocks
3642 * Before starting a resync we must have set curr_resync to
3643 * 2, and then checked that every "conflicting" array has curr_resync
3644 * less than ours. When we find one that is the same or higher
3645 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
3646 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
3647 * This will mean we have to start checking from the beginning again.
3652 mddev
->curr_resync
= 2;
3655 if (signal_pending(current
) ||
3656 kthread_should_stop()) {
3657 flush_signals(current
);
3658 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3661 ITERATE_MDDEV(mddev2
,tmp
) {
3662 if (mddev2
== mddev
)
3664 if (mddev2
->curr_resync
&&
3665 match_mddev_units(mddev
,mddev2
)) {
3667 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
3668 /* arbitrarily yield */
3669 mddev
->curr_resync
= 1;
3670 wake_up(&resync_wait
);
3672 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
3673 /* no need to wait here, we can wait the next
3674 * time 'round when curr_resync == 2
3677 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
3678 if (!signal_pending(current
) &&
3679 !kthread_should_stop() &&
3680 mddev2
->curr_resync
>= mddev
->curr_resync
) {
3681 printk(KERN_INFO
"md: delaying resync of %s"
3682 " until %s has finished resync (they"
3683 " share one or more physical units)\n",
3684 mdname(mddev
), mdname(mddev2
));
3687 finish_wait(&resync_wait
, &wq
);
3690 finish_wait(&resync_wait
, &wq
);
3693 } while (mddev
->curr_resync
< 2);
3695 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3696 /* resync follows the size requested by the personality,
3697 * which defaults to physical size, but can be virtual size
3699 max_sectors
= mddev
->resync_max_sectors
;
3701 /* recovery follows the physical size of devices */
3702 max_sectors
= mddev
->size
<< 1;
3704 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
3705 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
3706 " %d KB/sec/disc.\n", sysctl_speed_limit_min
);
3707 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
3708 "(but not more than %d KB/sec) for reconstruction.\n",
3709 sysctl_speed_limit_max
);
3711 is_mddev_idle(mddev
); /* this also initializes IO event counters */
3712 /* we don't use the checkpoint if there's a bitmap */
3713 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
)
3714 j
= mddev
->recovery_cp
;
3718 for (m
= 0; m
< SYNC_MARKS
; m
++) {
3720 mark_cnt
[m
] = io_sectors
;
3723 mddev
->resync_mark
= mark
[last_mark
];
3724 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
3727 * Tune reconstruction:
3729 window
= 32*(PAGE_SIZE
/512);
3730 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
3731 window
/2,(unsigned long long) max_sectors
/2);
3733 atomic_set(&mddev
->recovery_active
, 0);
3734 init_waitqueue_head(&mddev
->recovery_wait
);
3739 "md: resuming recovery of %s from checkpoint.\n",
3741 mddev
->curr_resync
= j
;
3744 while (j
< max_sectors
) {
3748 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
3749 currspeed
< sysctl_speed_limit_min
);
3751 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
3755 if (!skipped
) { /* actual IO requested */
3756 io_sectors
+= sectors
;
3757 atomic_add(sectors
, &mddev
->recovery_active
);
3761 if (j
>1) mddev
->curr_resync
= j
;
3764 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
3767 last_check
= io_sectors
;
3769 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
3770 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
3774 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
3776 int next
= (last_mark
+1) % SYNC_MARKS
;
3778 mddev
->resync_mark
= mark
[next
];
3779 mddev
->resync_mark_cnt
= mark_cnt
[next
];
3780 mark
[next
] = jiffies
;
3781 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
3786 if (signal_pending(current
) || kthread_should_stop()) {
3788 * got a signal, exit.
3791 "md: md_do_sync() got signal ... exiting\n");
3792 flush_signals(current
);
3793 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3798 * this loop exits only if either when we are slower than
3799 * the 'hard' speed limit, or the system was IO-idle for
3801 * the system might be non-idle CPU-wise, but we only care
3802 * about not overloading the IO subsystem. (things like an
3803 * e2fsck being done on the RAID array should execute fast)
3805 mddev
->queue
->unplug_fn(mddev
->queue
);
3808 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
3809 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
3811 if (currspeed
> sysctl_speed_limit_min
) {
3812 if ((currspeed
> sysctl_speed_limit_max
) ||
3813 !is_mddev_idle(mddev
)) {
3814 msleep_interruptible(250);
3819 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
3821 * this also signals 'finished resyncing' to md_stop
3824 mddev
->queue
->unplug_fn(mddev
->queue
);
3826 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
3828 /* tell personality that we are finished */
3829 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
3831 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
3832 mddev
->curr_resync
> 2 &&
3833 mddev
->curr_resync
>= mddev
->recovery_cp
) {
3834 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
3836 "md: checkpointing recovery of %s.\n",
3838 mddev
->recovery_cp
= mddev
->curr_resync
;
3840 mddev
->recovery_cp
= MaxSector
;
3844 mddev
->curr_resync
= 0;
3845 wake_up(&resync_wait
);
3846 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
3847 md_wakeup_thread(mddev
->thread
);
3852 * This routine is regularly called by all per-raid-array threads to
3853 * deal with generic issues like resync and super-block update.
3854 * Raid personalities that don't have a thread (linear/raid0) do not
3855 * need this as they never do any recovery or update the superblock.
3857 * It does not do any resync itself, but rather "forks" off other threads
3858 * to do that as needed.
3859 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
3860 * "->recovery" and create a thread at ->sync_thread.
3861 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
3862 * and wakeups up this thread which will reap the thread and finish up.
3863 * This thread also removes any faulty devices (with nr_pending == 0).
3865 * The overall approach is:
3866 * 1/ if the superblock needs updating, update it.
3867 * 2/ If a recovery thread is running, don't do anything else.
3868 * 3/ If recovery has finished, clean up, possibly marking spares active.
3869 * 4/ If there are any faulty devices, remove them.
3870 * 5/ If array is degraded, try to add spares devices
3871 * 6/ If array has spares or is not in-sync, start a resync thread.
3873 void md_check_recovery(mddev_t
*mddev
)
3876 struct list_head
*rtmp
;
3880 bitmap_daemon_work(mddev
->bitmap
);
3885 if (signal_pending(current
)) {
3886 if (mddev
->pers
->sync_request
) {
3887 printk(KERN_INFO
"md: %s in immediate safe mode\n",
3889 mddev
->safemode
= 2;
3891 flush_signals(current
);
3896 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
3897 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
3898 (mddev
->safemode
== 1) ||
3899 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
3900 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
3904 if (mddev_trylock(mddev
)==0) {
3907 spin_lock(&mddev
->write_lock
);
3908 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
3909 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
3911 mddev
->sb_dirty
= 1;
3913 if (mddev
->safemode
== 1)
3914 mddev
->safemode
= 0;
3915 spin_unlock(&mddev
->write_lock
);
3917 if (mddev
->sb_dirty
)
3918 md_update_sb(mddev
);
3921 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
3922 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
3923 /* resync/recovery still happening */
3924 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3927 if (mddev
->sync_thread
) {
3928 /* resync has finished, collect result */
3929 md_unregister_thread(mddev
->sync_thread
);
3930 mddev
->sync_thread
= NULL
;
3931 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
3932 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
3934 /* activate any spares */
3935 mddev
->pers
->spare_active(mddev
);
3937 md_update_sb(mddev
);
3939 /* if array is no-longer degraded, then any saved_raid_disk
3940 * information must be scrapped
3942 if (!mddev
->degraded
)
3943 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3944 rdev
->saved_raid_disk
= -1;
3946 mddev
->recovery
= 0;
3947 /* flag recovery needed just to double check */
3948 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3951 if (mddev
->recovery
)
3952 /* probably just the RECOVERY_NEEDED flag */
3953 mddev
->recovery
= 0;
3955 /* no recovery is running.
3956 * remove any failed drives, then
3957 * add spares if possible.
3958 * Spare are also removed and re-added, to allow
3959 * the personality to fail the re-add.
3961 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3962 if (rdev
->raid_disk
>= 0 &&
3963 (rdev
->faulty
|| ! rdev
->in_sync
) &&
3964 atomic_read(&rdev
->nr_pending
)==0) {
3965 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0)
3966 rdev
->raid_disk
= -1;
3969 if (mddev
->degraded
) {
3970 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3971 if (rdev
->raid_disk
< 0
3973 if (mddev
->pers
->hot_add_disk(mddev
,rdev
))
3980 if (!spares
&& (mddev
->recovery_cp
== MaxSector
)) {
3981 /* nothing we can do ... */
3984 if (mddev
->pers
->sync_request
) {
3985 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3987 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3988 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
3989 /* We are adding a device or devices to an array
3990 * which has the bitmap stored on all devices.
3991 * So make sure all bitmap pages get written
3993 bitmap_write_all(mddev
->bitmap
);
3995 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3998 if (!mddev
->sync_thread
) {
3999 printk(KERN_ERR
"%s: could not start resync"
4002 /* leave the spares where they are, it shouldn't hurt */
4003 mddev
->recovery
= 0;
4005 md_wakeup_thread(mddev
->sync_thread
);
4009 mddev_unlock(mddev
);
4013 static int md_notify_reboot(struct notifier_block
*this,
4014 unsigned long code
, void *x
)
4016 struct list_head
*tmp
;
4019 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
4021 printk(KERN_INFO
"md: stopping all md devices.\n");
4023 ITERATE_MDDEV(mddev
,tmp
)
4024 if (mddev_trylock(mddev
)==0)
4025 do_md_stop (mddev
, 1);
4027 * certain more exotic SCSI devices are known to be
4028 * volatile wrt too early system reboots. While the
4029 * right place to handle this issue is the given
4030 * driver, we do want to have a safe RAID driver ...
4037 static struct notifier_block md_notifier
= {
4038 .notifier_call
= md_notify_reboot
,
4040 .priority
= INT_MAX
, /* before any real devices */
4043 static void md_geninit(void)
4045 struct proc_dir_entry
*p
;
4047 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
4049 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
4051 p
->proc_fops
= &md_seq_fops
;
4054 static int __init
md_init(void)
4058 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4059 " MD_SB_DISKS=%d\n",
4060 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
4061 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
4062 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR
,
4065 if (register_blkdev(MAJOR_NR
, "md"))
4067 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
4068 unregister_blkdev(MAJOR_NR
, "md");
4072 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
4073 md_probe
, NULL
, NULL
);
4074 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
4075 md_probe
, NULL
, NULL
);
4077 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4078 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
4079 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4082 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4083 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
4084 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4088 register_reboot_notifier(&md_notifier
);
4089 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
4099 * Searches all registered partitions for autorun RAID arrays
4102 static dev_t detected_devices
[128];
4105 void md_autodetect_dev(dev_t dev
)
4107 if (dev_cnt
>= 0 && dev_cnt
< 127)
4108 detected_devices
[dev_cnt
++] = dev
;
4112 static void autostart_arrays(int part
)
4117 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
4119 for (i
= 0; i
< dev_cnt
; i
++) {
4120 dev_t dev
= detected_devices
[i
];
4122 rdev
= md_import_device(dev
,0, 0);
4130 list_add(&rdev
->same_set
, &pending_raid_disks
);
4134 autorun_devices(part
);
4139 static __exit
void md_exit(void)
4142 struct list_head
*tmp
;
4144 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
4145 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
4146 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4147 devfs_remove("md/%d", i
);
4148 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4149 devfs_remove("md/d%d", i
);
4153 unregister_blkdev(MAJOR_NR
,"md");
4154 unregister_blkdev(mdp_major
, "mdp");
4155 unregister_reboot_notifier(&md_notifier
);
4156 unregister_sysctl_table(raid_table_header
);
4157 remove_proc_entry("mdstat", NULL
);
4158 ITERATE_MDDEV(mddev
,tmp
) {
4159 struct gendisk
*disk
= mddev
->gendisk
;
4162 export_array(mddev
);
4165 mddev
->gendisk
= NULL
;
4170 module_init(md_init
)
4171 module_exit(md_exit
)
4173 EXPORT_SYMBOL(register_md_personality
);
4174 EXPORT_SYMBOL(unregister_md_personality
);
4175 EXPORT_SYMBOL(md_error
);
4176 EXPORT_SYMBOL(md_done_sync
);
4177 EXPORT_SYMBOL(md_write_start
);
4178 EXPORT_SYMBOL(md_write_end
);
4179 EXPORT_SYMBOL(md_register_thread
);
4180 EXPORT_SYMBOL(md_unregister_thread
);
4181 EXPORT_SYMBOL(md_wakeup_thread
);
4182 EXPORT_SYMBOL(md_print_devices
);
4183 EXPORT_SYMBOL(md_check_recovery
);
4184 MODULE_LICENSE("GPL");
4186 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);