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>
45 #include <linux/poll.h>
47 #include <linux/init.h>
49 #include <linux/file.h>
52 #include <linux/kmod.h>
55 #include <asm/unaligned.h>
57 #define MAJOR_NR MD_MAJOR
60 /* 63 partitions with the alternate major number (mdp) */
61 #define MdpMinorShift 6
64 #define dprintk(x...) ((void)(DEBUG && printk(x)))
68 static void autostart_arrays (int part
);
71 static LIST_HEAD(pers_list
);
72 static DEFINE_SPINLOCK(pers_lock
);
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
78 * the RAID driver will use the maximum available bandwidth if the IO
79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
84 * or /sys/block/mdX/md/sync_speed_{min,max}
87 static int sysctl_speed_limit_min
= 1000;
88 static int sysctl_speed_limit_max
= 200000;
89 static inline int speed_min(mddev_t
*mddev
)
91 return mddev
->sync_speed_min
?
92 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
95 static inline int speed_max(mddev_t
*mddev
)
97 return mddev
->sync_speed_max
?
98 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
101 static struct ctl_table_header
*raid_table_header
;
103 static ctl_table raid_table
[] = {
105 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
106 .procname
= "speed_limit_min",
107 .data
= &sysctl_speed_limit_min
,
108 .maxlen
= sizeof(int),
110 .proc_handler
= &proc_dointvec
,
113 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
114 .procname
= "speed_limit_max",
115 .data
= &sysctl_speed_limit_max
,
116 .maxlen
= sizeof(int),
118 .proc_handler
= &proc_dointvec
,
123 static ctl_table raid_dir_table
[] = {
125 .ctl_name
= DEV_RAID
,
134 static ctl_table raid_root_table
[] = {
140 .child
= raid_dir_table
,
145 static struct block_device_operations md_fops
;
147 static int start_readonly
;
150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
159 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
160 static atomic_t md_event_count
;
161 static void md_new_event(mddev_t
*mddev
)
163 atomic_inc(&md_event_count
);
164 wake_up(&md_event_waiters
);
168 * Enables to iterate over all existing md arrays
169 * all_mddevs_lock protects this list.
171 static LIST_HEAD(all_mddevs
);
172 static DEFINE_SPINLOCK(all_mddevs_lock
);
176 * iterates through all used mddevs in the system.
177 * We take care to grab the all_mddevs_lock whenever navigating
178 * the list, and to always hold a refcount when unlocked.
179 * Any code which breaks out of this loop while own
180 * a reference to the current mddev and must mddev_put it.
182 #define ITERATE_MDDEV(mddev,tmp) \
184 for (({ spin_lock(&all_mddevs_lock); \
185 tmp = all_mddevs.next; \
187 ({ if (tmp != &all_mddevs) \
188 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
189 spin_unlock(&all_mddevs_lock); \
190 if (mddev) mddev_put(mddev); \
191 mddev = list_entry(tmp, mddev_t, all_mddevs); \
192 tmp != &all_mddevs;}); \
193 ({ spin_lock(&all_mddevs_lock); \
198 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
200 bio_io_error(bio
, bio
->bi_size
);
204 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
206 atomic_inc(&mddev
->active
);
210 static void mddev_put(mddev_t
*mddev
)
212 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
214 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
215 list_del(&mddev
->all_mddevs
);
216 blk_put_queue(mddev
->queue
);
217 kobject_unregister(&mddev
->kobj
);
219 spin_unlock(&all_mddevs_lock
);
222 static mddev_t
* mddev_find(dev_t unit
)
224 mddev_t
*mddev
, *new = NULL
;
227 spin_lock(&all_mddevs_lock
);
228 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
229 if (mddev
->unit
== unit
) {
231 spin_unlock(&all_mddevs_lock
);
237 list_add(&new->all_mddevs
, &all_mddevs
);
238 spin_unlock(&all_mddevs_lock
);
241 spin_unlock(&all_mddevs_lock
);
243 new = kzalloc(sizeof(*new), GFP_KERNEL
);
248 if (MAJOR(unit
) == MD_MAJOR
)
249 new->md_minor
= MINOR(unit
);
251 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
253 init_MUTEX(&new->reconfig_sem
);
254 INIT_LIST_HEAD(&new->disks
);
255 INIT_LIST_HEAD(&new->all_mddevs
);
256 init_timer(&new->safemode_timer
);
257 atomic_set(&new->active
, 1);
258 spin_lock_init(&new->write_lock
);
259 init_waitqueue_head(&new->sb_wait
);
261 new->queue
= blk_alloc_queue(GFP_KERNEL
);
267 blk_queue_make_request(new->queue
, md_fail_request
);
272 static inline int mddev_lock(mddev_t
* mddev
)
274 return down_interruptible(&mddev
->reconfig_sem
);
277 static inline void mddev_lock_uninterruptible(mddev_t
* mddev
)
279 down(&mddev
->reconfig_sem
);
282 static inline int mddev_trylock(mddev_t
* mddev
)
284 return down_trylock(&mddev
->reconfig_sem
);
287 static inline void mddev_unlock(mddev_t
* mddev
)
289 up(&mddev
->reconfig_sem
);
291 md_wakeup_thread(mddev
->thread
);
294 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
297 struct list_head
*tmp
;
299 ITERATE_RDEV(mddev
,rdev
,tmp
) {
300 if (rdev
->desc_nr
== nr
)
306 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
308 struct list_head
*tmp
;
311 ITERATE_RDEV(mddev
,rdev
,tmp
) {
312 if (rdev
->bdev
->bd_dev
== dev
)
318 static struct mdk_personality
*find_pers(int level
, char *clevel
)
320 struct mdk_personality
*pers
;
321 list_for_each_entry(pers
, &pers_list
, list
) {
322 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
324 if (strcmp(pers
->name
, clevel
)==0)
330 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
332 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
333 return MD_NEW_SIZE_BLOCKS(size
);
336 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
340 size
= rdev
->sb_offset
;
343 size
&= ~((sector_t
)chunk_size
/1024 - 1);
347 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
352 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
353 if (!rdev
->sb_page
) {
354 printk(KERN_ALERT
"md: out of memory.\n");
361 static void free_disk_sb(mdk_rdev_t
* rdev
)
364 put_page(rdev
->sb_page
);
366 rdev
->sb_page
= NULL
;
373 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
375 mdk_rdev_t
*rdev
= bio
->bi_private
;
376 mddev_t
*mddev
= rdev
->mddev
;
380 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
381 md_error(mddev
, rdev
);
383 if (atomic_dec_and_test(&mddev
->pending_writes
))
384 wake_up(&mddev
->sb_wait
);
389 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
391 struct bio
*bio2
= bio
->bi_private
;
392 mdk_rdev_t
*rdev
= bio2
->bi_private
;
393 mddev_t
*mddev
= rdev
->mddev
;
397 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
398 error
== -EOPNOTSUPP
) {
400 /* barriers don't appear to be supported :-( */
401 set_bit(BarriersNotsupp
, &rdev
->flags
);
402 mddev
->barriers_work
= 0;
403 spin_lock_irqsave(&mddev
->write_lock
, flags
);
404 bio2
->bi_next
= mddev
->biolist
;
405 mddev
->biolist
= bio2
;
406 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
407 wake_up(&mddev
->sb_wait
);
412 bio
->bi_private
= rdev
;
413 return super_written(bio
, bytes_done
, error
);
416 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
417 sector_t sector
, int size
, struct page
*page
)
419 /* write first size bytes of page to sector of rdev
420 * Increment mddev->pending_writes before returning
421 * and decrement it on completion, waking up sb_wait
422 * if zero is reached.
423 * If an error occurred, call md_error
425 * As we might need to resubmit the request if BIO_RW_BARRIER
426 * causes ENOTSUPP, we allocate a spare bio...
428 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
429 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
431 bio
->bi_bdev
= rdev
->bdev
;
432 bio
->bi_sector
= sector
;
433 bio_add_page(bio
, page
, size
, 0);
434 bio
->bi_private
= rdev
;
435 bio
->bi_end_io
= super_written
;
438 atomic_inc(&mddev
->pending_writes
);
439 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
441 rw
|= (1<<BIO_RW_BARRIER
);
442 rbio
= bio_clone(bio
, GFP_NOIO
);
443 rbio
->bi_private
= bio
;
444 rbio
->bi_end_io
= super_written_barrier
;
445 submit_bio(rw
, rbio
);
450 void md_super_wait(mddev_t
*mddev
)
452 /* wait for all superblock writes that were scheduled to complete.
453 * if any had to be retried (due to BARRIER problems), retry them
457 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
458 if (atomic_read(&mddev
->pending_writes
)==0)
460 while (mddev
->biolist
) {
462 spin_lock_irq(&mddev
->write_lock
);
463 bio
= mddev
->biolist
;
464 mddev
->biolist
= bio
->bi_next
;
466 spin_unlock_irq(&mddev
->write_lock
);
467 submit_bio(bio
->bi_rw
, bio
);
471 finish_wait(&mddev
->sb_wait
, &wq
);
474 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
479 complete((struct completion
*)bio
->bi_private
);
483 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
484 struct page
*page
, int rw
)
486 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
487 struct completion event
;
490 rw
|= (1 << BIO_RW_SYNC
);
493 bio
->bi_sector
= sector
;
494 bio_add_page(bio
, page
, size
, 0);
495 init_completion(&event
);
496 bio
->bi_private
= &event
;
497 bio
->bi_end_io
= bi_complete
;
499 wait_for_completion(&event
);
501 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
505 EXPORT_SYMBOL_GPL(sync_page_io
);
507 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
509 char b
[BDEVNAME_SIZE
];
510 if (!rdev
->sb_page
) {
518 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
524 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
525 bdevname(rdev
->bdev
,b
));
529 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
531 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
532 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
533 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
534 (sb1
->set_uuid3
== sb2
->set_uuid3
))
542 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
545 mdp_super_t
*tmp1
, *tmp2
;
547 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
548 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
550 if (!tmp1
|| !tmp2
) {
552 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
560 * nr_disks is not constant
565 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
576 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
578 unsigned int disk_csum
, csum
;
580 disk_csum
= sb
->sb_csum
;
582 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
583 sb
->sb_csum
= disk_csum
;
589 * Handle superblock details.
590 * We want to be able to handle multiple superblock formats
591 * so we have a common interface to them all, and an array of
592 * different handlers.
593 * We rely on user-space to write the initial superblock, and support
594 * reading and updating of superblocks.
595 * Interface methods are:
596 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
597 * loads and validates a superblock on dev.
598 * if refdev != NULL, compare superblocks on both devices
600 * 0 - dev has a superblock that is compatible with refdev
601 * 1 - dev has a superblock that is compatible and newer than refdev
602 * so dev should be used as the refdev in future
603 * -EINVAL superblock incompatible or invalid
604 * -othererror e.g. -EIO
606 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
607 * Verify that dev is acceptable into mddev.
608 * The first time, mddev->raid_disks will be 0, and data from
609 * dev should be merged in. Subsequent calls check that dev
610 * is new enough. Return 0 or -EINVAL
612 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
613 * Update the superblock for rdev with data in mddev
614 * This does not write to disc.
620 struct module
*owner
;
621 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
622 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
623 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
627 * load_super for 0.90.0
629 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
631 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
637 * Calculate the position of the superblock,
638 * it's at the end of the disk.
640 * It also happens to be a multiple of 4Kb.
642 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
643 rdev
->sb_offset
= sb_offset
;
645 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
650 bdevname(rdev
->bdev
, b
);
651 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
653 if (sb
->md_magic
!= MD_SB_MAGIC
) {
654 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
659 if (sb
->major_version
!= 0 ||
660 sb
->minor_version
!= 90) {
661 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
662 sb
->major_version
, sb
->minor_version
,
667 if (sb
->raid_disks
<= 0)
670 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
671 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
676 rdev
->preferred_minor
= sb
->md_minor
;
677 rdev
->data_offset
= 0;
678 rdev
->sb_size
= MD_SB_BYTES
;
680 if (sb
->level
== LEVEL_MULTIPATH
)
683 rdev
->desc_nr
= sb
->this_disk
.number
;
689 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
690 if (!uuid_equal(refsb
, sb
)) {
691 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
692 b
, bdevname(refdev
->bdev
,b2
));
695 if (!sb_equal(refsb
, sb
)) {
696 printk(KERN_WARNING
"md: %s has same UUID"
697 " but different superblock to %s\n",
698 b
, bdevname(refdev
->bdev
, b2
));
702 ev2
= md_event(refsb
);
708 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
710 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
711 /* "this cannot possibly happen" ... */
719 * validate_super for 0.90.0
721 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
724 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
726 rdev
->raid_disk
= -1;
728 if (mddev
->raid_disks
== 0) {
729 mddev
->major_version
= 0;
730 mddev
->minor_version
= sb
->minor_version
;
731 mddev
->patch_version
= sb
->patch_version
;
732 mddev
->persistent
= ! sb
->not_persistent
;
733 mddev
->chunk_size
= sb
->chunk_size
;
734 mddev
->ctime
= sb
->ctime
;
735 mddev
->utime
= sb
->utime
;
736 mddev
->level
= sb
->level
;
737 mddev
->clevel
[0] = 0;
738 mddev
->layout
= sb
->layout
;
739 mddev
->raid_disks
= sb
->raid_disks
;
740 mddev
->size
= sb
->size
;
741 mddev
->events
= md_event(sb
);
742 mddev
->bitmap_offset
= 0;
743 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
745 if (sb
->state
& (1<<MD_SB_CLEAN
))
746 mddev
->recovery_cp
= MaxSector
;
748 if (sb
->events_hi
== sb
->cp_events_hi
&&
749 sb
->events_lo
== sb
->cp_events_lo
) {
750 mddev
->recovery_cp
= sb
->recovery_cp
;
752 mddev
->recovery_cp
= 0;
755 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
756 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
757 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
758 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
760 mddev
->max_disks
= MD_SB_DISKS
;
762 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
763 mddev
->bitmap_file
== NULL
) {
764 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
765 && mddev
->level
!= 10) {
766 /* FIXME use a better test */
767 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
770 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
773 } else if (mddev
->pers
== NULL
) {
774 /* Insist on good event counter while assembling */
775 __u64 ev1
= md_event(sb
);
777 if (ev1
< mddev
->events
)
779 } else if (mddev
->bitmap
) {
780 /* if adding to array with a bitmap, then we can accept an
781 * older device ... but not too old.
783 __u64 ev1
= md_event(sb
);
784 if (ev1
< mddev
->bitmap
->events_cleared
)
786 } else /* just a hot-add of a new device, leave raid_disk at -1 */
789 if (mddev
->level
!= LEVEL_MULTIPATH
) {
790 desc
= sb
->disks
+ rdev
->desc_nr
;
792 if (desc
->state
& (1<<MD_DISK_FAULTY
))
793 set_bit(Faulty
, &rdev
->flags
);
794 else if (desc
->state
& (1<<MD_DISK_SYNC
) &&
795 desc
->raid_disk
< mddev
->raid_disks
) {
796 set_bit(In_sync
, &rdev
->flags
);
797 rdev
->raid_disk
= desc
->raid_disk
;
799 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
800 set_bit(WriteMostly
, &rdev
->flags
);
801 } else /* MULTIPATH are always insync */
802 set_bit(In_sync
, &rdev
->flags
);
807 * sync_super for 0.90.0
809 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
812 struct list_head
*tmp
;
814 int next_spare
= mddev
->raid_disks
;
817 /* make rdev->sb match mddev data..
820 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
821 * 3/ any empty disks < next_spare become removed
823 * disks[0] gets initialised to REMOVED because
824 * we cannot be sure from other fields if it has
825 * been initialised or not.
828 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
830 rdev
->sb_size
= MD_SB_BYTES
;
832 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
834 memset(sb
, 0, sizeof(*sb
));
836 sb
->md_magic
= MD_SB_MAGIC
;
837 sb
->major_version
= mddev
->major_version
;
838 sb
->minor_version
= mddev
->minor_version
;
839 sb
->patch_version
= mddev
->patch_version
;
840 sb
->gvalid_words
= 0; /* ignored */
841 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
842 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
843 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
844 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
846 sb
->ctime
= mddev
->ctime
;
847 sb
->level
= mddev
->level
;
848 sb
->size
= mddev
->size
;
849 sb
->raid_disks
= mddev
->raid_disks
;
850 sb
->md_minor
= mddev
->md_minor
;
851 sb
->not_persistent
= !mddev
->persistent
;
852 sb
->utime
= mddev
->utime
;
854 sb
->events_hi
= (mddev
->events
>>32);
855 sb
->events_lo
= (u32
)mddev
->events
;
859 sb
->recovery_cp
= mddev
->recovery_cp
;
860 sb
->cp_events_hi
= (mddev
->events
>>32);
861 sb
->cp_events_lo
= (u32
)mddev
->events
;
862 if (mddev
->recovery_cp
== MaxSector
)
863 sb
->state
= (1<< MD_SB_CLEAN
);
867 sb
->layout
= mddev
->layout
;
868 sb
->chunk_size
= mddev
->chunk_size
;
870 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
871 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
873 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
874 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
877 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
878 && !test_bit(Faulty
, &rdev2
->flags
))
879 desc_nr
= rdev2
->raid_disk
;
881 desc_nr
= next_spare
++;
882 rdev2
->desc_nr
= desc_nr
;
883 d
= &sb
->disks
[rdev2
->desc_nr
];
885 d
->number
= rdev2
->desc_nr
;
886 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
887 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
888 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
889 && !test_bit(Faulty
, &rdev2
->flags
))
890 d
->raid_disk
= rdev2
->raid_disk
;
892 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
893 if (test_bit(Faulty
, &rdev2
->flags
)) {
894 d
->state
= (1<<MD_DISK_FAULTY
);
896 } else if (test_bit(In_sync
, &rdev2
->flags
)) {
897 d
->state
= (1<<MD_DISK_ACTIVE
);
898 d
->state
|= (1<<MD_DISK_SYNC
);
906 if (test_bit(WriteMostly
, &rdev2
->flags
))
907 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
909 /* now set the "removed" and "faulty" bits on any missing devices */
910 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
911 mdp_disk_t
*d
= &sb
->disks
[i
];
912 if (d
->state
== 0 && d
->number
== 0) {
915 d
->state
= (1<<MD_DISK_REMOVED
);
916 d
->state
|= (1<<MD_DISK_FAULTY
);
920 sb
->nr_disks
= nr_disks
;
921 sb
->active_disks
= active
;
922 sb
->working_disks
= working
;
923 sb
->failed_disks
= failed
;
924 sb
->spare_disks
= spare
;
926 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
927 sb
->sb_csum
= calc_sb_csum(sb
);
931 * version 1 superblock
934 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
936 unsigned int disk_csum
, csum
;
937 unsigned long long newcsum
;
938 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
939 unsigned int *isuper
= (unsigned int*)sb
;
942 disk_csum
= sb
->sb_csum
;
945 for (i
=0; size
>=4; size
-= 4 )
946 newcsum
+= le32_to_cpu(*isuper
++);
949 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
951 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
952 sb
->sb_csum
= disk_csum
;
953 return cpu_to_le32(csum
);
956 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
958 struct mdp_superblock_1
*sb
;
961 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
965 * Calculate the position of the superblock.
966 * It is always aligned to a 4K boundary and
967 * depeding on minor_version, it can be:
968 * 0: At least 8K, but less than 12K, from end of device
969 * 1: At start of device
970 * 2: 4K from start of device.
972 switch(minor_version
) {
974 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
976 sb_offset
&= ~(sector_t
)(4*2-1);
977 /* convert from sectors to K */
989 rdev
->sb_offset
= sb_offset
;
991 /* superblock is rarely larger than 1K, but it can be larger,
992 * and it is safe to read 4k, so we do that
994 ret
= read_disk_sb(rdev
, 4096);
998 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1000 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1001 sb
->major_version
!= cpu_to_le32(1) ||
1002 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1003 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1004 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1007 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1008 printk("md: invalid superblock checksum on %s\n",
1009 bdevname(rdev
->bdev
,b
));
1012 if (le64_to_cpu(sb
->data_size
) < 10) {
1013 printk("md: data_size too small on %s\n",
1014 bdevname(rdev
->bdev
,b
));
1017 rdev
->preferred_minor
= 0xffff;
1018 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1019 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1021 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1022 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1023 if (rdev
->sb_size
& bmask
)
1024 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1030 struct mdp_superblock_1
*refsb
=
1031 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1033 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1034 sb
->level
!= refsb
->level
||
1035 sb
->layout
!= refsb
->layout
||
1036 sb
->chunksize
!= refsb
->chunksize
) {
1037 printk(KERN_WARNING
"md: %s has strangely different"
1038 " superblock to %s\n",
1039 bdevname(rdev
->bdev
,b
),
1040 bdevname(refdev
->bdev
,b2
));
1043 ev1
= le64_to_cpu(sb
->events
);
1044 ev2
= le64_to_cpu(refsb
->events
);
1050 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1052 rdev
->size
= rdev
->sb_offset
;
1053 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1055 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1056 if (le32_to_cpu(sb
->chunksize
))
1057 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1059 if (le32_to_cpu(sb
->size
) > rdev
->size
*2)
1064 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1066 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1068 rdev
->raid_disk
= -1;
1070 if (mddev
->raid_disks
== 0) {
1071 mddev
->major_version
= 1;
1072 mddev
->patch_version
= 0;
1073 mddev
->persistent
= 1;
1074 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1075 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1076 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1077 mddev
->level
= le32_to_cpu(sb
->level
);
1078 mddev
->clevel
[0] = 0;
1079 mddev
->layout
= le32_to_cpu(sb
->layout
);
1080 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1081 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1082 mddev
->events
= le64_to_cpu(sb
->events
);
1083 mddev
->bitmap_offset
= 0;
1084 mddev
->default_bitmap_offset
= 1024;
1086 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1087 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1089 mddev
->max_disks
= (4096-256)/2;
1091 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1092 mddev
->bitmap_file
== NULL
) {
1093 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
1094 && mddev
->level
!= 10) {
1095 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
1098 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1100 } else if (mddev
->pers
== NULL
) {
1101 /* Insist of good event counter while assembling */
1102 __u64 ev1
= le64_to_cpu(sb
->events
);
1104 if (ev1
< mddev
->events
)
1106 } else if (mddev
->bitmap
) {
1107 /* If adding to array with a bitmap, then we can accept an
1108 * older device, but not too old.
1110 __u64 ev1
= le64_to_cpu(sb
->events
);
1111 if (ev1
< mddev
->bitmap
->events_cleared
)
1113 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1116 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1118 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1119 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1121 case 0xffff: /* spare */
1123 case 0xfffe: /* faulty */
1124 set_bit(Faulty
, &rdev
->flags
);
1127 set_bit(In_sync
, &rdev
->flags
);
1128 rdev
->raid_disk
= role
;
1131 if (sb
->devflags
& WriteMostly1
)
1132 set_bit(WriteMostly
, &rdev
->flags
);
1133 } else /* MULTIPATH are always insync */
1134 set_bit(In_sync
, &rdev
->flags
);
1139 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1141 struct mdp_superblock_1
*sb
;
1142 struct list_head
*tmp
;
1145 /* make rdev->sb match mddev and rdev data. */
1147 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1149 sb
->feature_map
= 0;
1151 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1152 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1153 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1155 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1156 sb
->events
= cpu_to_le64(mddev
->events
);
1158 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1160 sb
->resync_offset
= cpu_to_le64(0);
1162 sb
->cnt_corrected_read
= atomic_read(&rdev
->corrected_errors
);
1164 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1165 sb
->size
= cpu_to_le64(mddev
->size
);
1167 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1168 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1169 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1173 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1174 if (rdev2
->desc_nr
+1 > max_dev
)
1175 max_dev
= rdev2
->desc_nr
+1;
1177 sb
->max_dev
= cpu_to_le32(max_dev
);
1178 for (i
=0; i
<max_dev
;i
++)
1179 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1181 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1183 if (test_bit(Faulty
, &rdev2
->flags
))
1184 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1185 else if (test_bit(In_sync
, &rdev2
->flags
))
1186 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1188 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1191 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1192 sb
->sb_csum
= calc_sb_1_csum(sb
);
1196 static struct super_type super_types
[] = {
1199 .owner
= THIS_MODULE
,
1200 .load_super
= super_90_load
,
1201 .validate_super
= super_90_validate
,
1202 .sync_super
= super_90_sync
,
1206 .owner
= THIS_MODULE
,
1207 .load_super
= super_1_load
,
1208 .validate_super
= super_1_validate
,
1209 .sync_super
= super_1_sync
,
1213 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1215 struct list_head
*tmp
;
1218 ITERATE_RDEV(mddev
,rdev
,tmp
)
1219 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1225 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1227 struct list_head
*tmp
;
1230 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1231 if (match_dev_unit(mddev2
, rdev
))
1237 static LIST_HEAD(pending_raid_disks
);
1239 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1241 mdk_rdev_t
*same_pdev
;
1242 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1250 /* make sure rdev->size exceeds mddev->size */
1251 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1253 /* Cannot change size, so fail */
1256 mddev
->size
= rdev
->size
;
1258 same_pdev
= match_dev_unit(mddev
, rdev
);
1261 "%s: WARNING: %s appears to be on the same physical"
1262 " disk as %s. True\n protection against single-disk"
1263 " failure might be compromised.\n",
1264 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1265 bdevname(same_pdev
->bdev
,b2
));
1267 /* Verify rdev->desc_nr is unique.
1268 * If it is -1, assign a free number, else
1269 * check number is not in use
1271 if (rdev
->desc_nr
< 0) {
1273 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1274 while (find_rdev_nr(mddev
, choice
))
1276 rdev
->desc_nr
= choice
;
1278 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1281 bdevname(rdev
->bdev
,b
);
1282 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1284 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1287 list_add(&rdev
->same_set
, &mddev
->disks
);
1288 rdev
->mddev
= mddev
;
1289 printk(KERN_INFO
"md: bind<%s>\n", b
);
1291 rdev
->kobj
.parent
= &mddev
->kobj
;
1292 kobject_add(&rdev
->kobj
);
1294 if (rdev
->bdev
->bd_part
)
1295 ko
= &rdev
->bdev
->bd_part
->kobj
;
1297 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1298 sysfs_create_link(&rdev
->kobj
, ko
, "block");
1302 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1304 char b
[BDEVNAME_SIZE
];
1309 list_del_init(&rdev
->same_set
);
1310 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1312 sysfs_remove_link(&rdev
->kobj
, "block");
1313 kobject_del(&rdev
->kobj
);
1317 * prevent the device from being mounted, repartitioned or
1318 * otherwise reused by a RAID array (or any other kernel
1319 * subsystem), by bd_claiming the device.
1321 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1324 struct block_device
*bdev
;
1325 char b
[BDEVNAME_SIZE
];
1327 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1329 printk(KERN_ERR
"md: could not open %s.\n",
1330 __bdevname(dev
, b
));
1331 return PTR_ERR(bdev
);
1333 err
= bd_claim(bdev
, rdev
);
1335 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1344 static void unlock_rdev(mdk_rdev_t
*rdev
)
1346 struct block_device
*bdev
= rdev
->bdev
;
1354 void md_autodetect_dev(dev_t dev
);
1356 static void export_rdev(mdk_rdev_t
* rdev
)
1358 char b
[BDEVNAME_SIZE
];
1359 printk(KERN_INFO
"md: export_rdev(%s)\n",
1360 bdevname(rdev
->bdev
,b
));
1364 list_del_init(&rdev
->same_set
);
1366 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1369 kobject_put(&rdev
->kobj
);
1372 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1374 unbind_rdev_from_array(rdev
);
1378 static void export_array(mddev_t
*mddev
)
1380 struct list_head
*tmp
;
1383 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1388 kick_rdev_from_array(rdev
);
1390 if (!list_empty(&mddev
->disks
))
1392 mddev
->raid_disks
= 0;
1393 mddev
->major_version
= 0;
1396 static void print_desc(mdp_disk_t
*desc
)
1398 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1399 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1402 static void print_sb(mdp_super_t
*sb
)
1407 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1408 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1409 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1411 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1412 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1413 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1414 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1415 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1416 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1417 sb
->failed_disks
, sb
->spare_disks
,
1418 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1421 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1424 desc
= sb
->disks
+ i
;
1425 if (desc
->number
|| desc
->major
|| desc
->minor
||
1426 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1427 printk(" D %2d: ", i
);
1431 printk(KERN_INFO
"md: THIS: ");
1432 print_desc(&sb
->this_disk
);
1436 static void print_rdev(mdk_rdev_t
*rdev
)
1438 char b
[BDEVNAME_SIZE
];
1439 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1440 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1441 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1443 if (rdev
->sb_loaded
) {
1444 printk(KERN_INFO
"md: rdev superblock:\n");
1445 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1447 printk(KERN_INFO
"md: no rdev superblock!\n");
1450 void md_print_devices(void)
1452 struct list_head
*tmp
, *tmp2
;
1455 char b
[BDEVNAME_SIZE
];
1458 printk("md: **********************************\n");
1459 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1460 printk("md: **********************************\n");
1461 ITERATE_MDDEV(mddev
,tmp
) {
1464 bitmap_print_sb(mddev
->bitmap
);
1466 printk("%s: ", mdname(mddev
));
1467 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1468 printk("<%s>", bdevname(rdev
->bdev
,b
));
1471 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1474 printk("md: **********************************\n");
1479 static void sync_sbs(mddev_t
* mddev
)
1482 struct list_head
*tmp
;
1484 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1485 super_types
[mddev
->major_version
].
1486 sync_super(mddev
, rdev
);
1487 rdev
->sb_loaded
= 1;
1491 static void md_update_sb(mddev_t
* mddev
)
1494 struct list_head
*tmp
;
1499 spin_lock_irq(&mddev
->write_lock
);
1500 sync_req
= mddev
->in_sync
;
1501 mddev
->utime
= get_seconds();
1504 if (!mddev
->events
) {
1506 * oops, this 64-bit counter should never wrap.
1507 * Either we are in around ~1 trillion A.C., assuming
1508 * 1 reboot per second, or we have a bug:
1513 mddev
->sb_dirty
= 2;
1517 * do not write anything to disk if using
1518 * nonpersistent superblocks
1520 if (!mddev
->persistent
) {
1521 mddev
->sb_dirty
= 0;
1522 spin_unlock_irq(&mddev
->write_lock
);
1523 wake_up(&mddev
->sb_wait
);
1526 spin_unlock_irq(&mddev
->write_lock
);
1529 "md: updating %s RAID superblock on device (in sync %d)\n",
1530 mdname(mddev
),mddev
->in_sync
);
1532 err
= bitmap_update_sb(mddev
->bitmap
);
1533 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1534 char b
[BDEVNAME_SIZE
];
1535 dprintk(KERN_INFO
"md: ");
1536 if (test_bit(Faulty
, &rdev
->flags
))
1537 dprintk("(skipping faulty ");
1539 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1540 if (!test_bit(Faulty
, &rdev
->flags
)) {
1541 md_super_write(mddev
,rdev
,
1542 rdev
->sb_offset
<<1, rdev
->sb_size
,
1544 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1545 bdevname(rdev
->bdev
,b
),
1546 (unsigned long long)rdev
->sb_offset
);
1550 if (mddev
->level
== LEVEL_MULTIPATH
)
1551 /* only need to write one superblock... */
1554 md_super_wait(mddev
);
1555 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1557 spin_lock_irq(&mddev
->write_lock
);
1558 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1559 /* have to write it out again */
1560 spin_unlock_irq(&mddev
->write_lock
);
1563 mddev
->sb_dirty
= 0;
1564 spin_unlock_irq(&mddev
->write_lock
);
1565 wake_up(&mddev
->sb_wait
);
1569 /* words written to sysfs files may, or my not, be \n terminated.
1570 * We want to accept with case. For this we use cmd_match.
1572 static int cmd_match(const char *cmd
, const char *str
)
1574 /* See if cmd, written into a sysfs file, matches
1575 * str. They must either be the same, or cmd can
1576 * have a trailing newline
1578 while (*cmd
&& *str
&& *cmd
== *str
) {
1589 struct rdev_sysfs_entry
{
1590 struct attribute attr
;
1591 ssize_t (*show
)(mdk_rdev_t
*, char *);
1592 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1596 state_show(mdk_rdev_t
*rdev
, char *page
)
1601 if (test_bit(Faulty
, &rdev
->flags
)) {
1602 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1605 if (test_bit(In_sync
, &rdev
->flags
)) {
1606 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1609 if (!test_bit(Faulty
, &rdev
->flags
) &&
1610 !test_bit(In_sync
, &rdev
->flags
)) {
1611 len
+= sprintf(page
+len
, "%sspare", sep
);
1614 return len
+sprintf(page
+len
, "\n");
1617 static struct rdev_sysfs_entry
1618 rdev_state
= __ATTR_RO(state
);
1621 super_show(mdk_rdev_t
*rdev
, char *page
)
1623 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1624 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1625 return rdev
->sb_size
;
1629 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1632 errors_show(mdk_rdev_t
*rdev
, char *page
)
1634 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1638 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1641 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1642 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1643 atomic_set(&rdev
->corrected_errors
, n
);
1648 static struct rdev_sysfs_entry rdev_errors
=
1649 __ATTR(errors
, 0644, errors_show
, errors_store
);
1652 slot_show(mdk_rdev_t
*rdev
, char *page
)
1654 if (rdev
->raid_disk
< 0)
1655 return sprintf(page
, "none\n");
1657 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1661 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1664 int slot
= simple_strtoul(buf
, &e
, 10);
1665 if (strncmp(buf
, "none", 4)==0)
1667 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1669 if (rdev
->mddev
->pers
)
1670 /* Cannot set slot in active array (yet) */
1672 if (slot
>= rdev
->mddev
->raid_disks
)
1674 rdev
->raid_disk
= slot
;
1675 /* assume it is working */
1677 set_bit(In_sync
, &rdev
->flags
);
1682 static struct rdev_sysfs_entry rdev_slot
=
1683 __ATTR(slot
, 0644, slot_show
, slot_store
);
1686 offset_show(mdk_rdev_t
*rdev
, char *page
)
1688 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1692 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1695 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1696 if (e
==buf
|| (*e
&& *e
!= '\n'))
1698 if (rdev
->mddev
->pers
)
1700 rdev
->data_offset
= offset
;
1704 static struct rdev_sysfs_entry rdev_offset
=
1705 __ATTR(offset
, 0644, offset_show
, offset_store
);
1708 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1710 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1714 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1717 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1718 if (e
==buf
|| (*e
&& *e
!= '\n'))
1720 if (rdev
->mddev
->pers
)
1723 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1724 rdev
->mddev
->size
= size
;
1728 static struct rdev_sysfs_entry rdev_size
=
1729 __ATTR(size
, 0644, rdev_size_show
, rdev_size_store
);
1731 static struct attribute
*rdev_default_attrs
[] = {
1741 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1743 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1744 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1748 return entry
->show(rdev
, page
);
1752 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1753 const char *page
, size_t length
)
1755 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1756 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1760 return entry
->store(rdev
, page
, length
);
1763 static void rdev_free(struct kobject
*ko
)
1765 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1768 static struct sysfs_ops rdev_sysfs_ops
= {
1769 .show
= rdev_attr_show
,
1770 .store
= rdev_attr_store
,
1772 static struct kobj_type rdev_ktype
= {
1773 .release
= rdev_free
,
1774 .sysfs_ops
= &rdev_sysfs_ops
,
1775 .default_attrs
= rdev_default_attrs
,
1779 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1781 * mark the device faulty if:
1783 * - the device is nonexistent (zero size)
1784 * - the device has no valid superblock
1786 * a faulty rdev _never_ has rdev->sb set.
1788 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1790 char b
[BDEVNAME_SIZE
];
1795 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
1797 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1798 return ERR_PTR(-ENOMEM
);
1801 if ((err
= alloc_disk_sb(rdev
)))
1804 err
= lock_rdev(rdev
, newdev
);
1808 rdev
->kobj
.parent
= NULL
;
1809 rdev
->kobj
.ktype
= &rdev_ktype
;
1810 kobject_init(&rdev
->kobj
);
1814 rdev
->data_offset
= 0;
1815 atomic_set(&rdev
->nr_pending
, 0);
1816 atomic_set(&rdev
->read_errors
, 0);
1817 atomic_set(&rdev
->corrected_errors
, 0);
1819 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1822 "md: %s has zero or unknown size, marking faulty!\n",
1823 bdevname(rdev
->bdev
,b
));
1828 if (super_format
>= 0) {
1829 err
= super_types
[super_format
].
1830 load_super(rdev
, NULL
, super_minor
);
1831 if (err
== -EINVAL
) {
1833 "md: %s has invalid sb, not importing!\n",
1834 bdevname(rdev
->bdev
,b
));
1839 "md: could not read %s's sb, not importing!\n",
1840 bdevname(rdev
->bdev
,b
));
1844 INIT_LIST_HEAD(&rdev
->same_set
);
1849 if (rdev
->sb_page
) {
1855 return ERR_PTR(err
);
1859 * Check a full RAID array for plausibility
1863 static void analyze_sbs(mddev_t
* mddev
)
1866 struct list_head
*tmp
;
1867 mdk_rdev_t
*rdev
, *freshest
;
1868 char b
[BDEVNAME_SIZE
];
1871 ITERATE_RDEV(mddev
,rdev
,tmp
)
1872 switch (super_types
[mddev
->major_version
].
1873 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1881 "md: fatal superblock inconsistency in %s"
1882 " -- removing from array\n",
1883 bdevname(rdev
->bdev
,b
));
1884 kick_rdev_from_array(rdev
);
1888 super_types
[mddev
->major_version
].
1889 validate_super(mddev
, freshest
);
1892 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1893 if (rdev
!= freshest
)
1894 if (super_types
[mddev
->major_version
].
1895 validate_super(mddev
, rdev
)) {
1896 printk(KERN_WARNING
"md: kicking non-fresh %s"
1898 bdevname(rdev
->bdev
,b
));
1899 kick_rdev_from_array(rdev
);
1902 if (mddev
->level
== LEVEL_MULTIPATH
) {
1903 rdev
->desc_nr
= i
++;
1904 rdev
->raid_disk
= rdev
->desc_nr
;
1905 set_bit(In_sync
, &rdev
->flags
);
1911 if (mddev
->recovery_cp
!= MaxSector
&&
1913 printk(KERN_ERR
"md: %s: raid array is not clean"
1914 " -- starting background reconstruction\n",
1920 level_show(mddev_t
*mddev
, char *page
)
1922 struct mdk_personality
*p
= mddev
->pers
;
1924 return sprintf(page
, "%s\n", p
->name
);
1925 else if (mddev
->clevel
[0])
1926 return sprintf(page
, "%s\n", mddev
->clevel
);
1927 else if (mddev
->level
!= LEVEL_NONE
)
1928 return sprintf(page
, "%d\n", mddev
->level
);
1934 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1941 if (len
>= sizeof(mddev
->clevel
))
1943 strncpy(mddev
->clevel
, buf
, len
);
1944 if (mddev
->clevel
[len
-1] == '\n')
1946 mddev
->clevel
[len
] = 0;
1947 mddev
->level
= LEVEL_NONE
;
1951 static struct md_sysfs_entry md_level
=
1952 __ATTR(level
, 0644, level_show
, level_store
);
1955 raid_disks_show(mddev_t
*mddev
, char *page
)
1957 if (mddev
->raid_disks
== 0)
1959 return sprintf(page
, "%d\n", mddev
->raid_disks
);
1962 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
1965 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1967 /* can only set raid_disks if array is not yet active */
1970 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1972 if (!*buf
|| (*e
&& *e
!= '\n'))
1976 rv
= update_raid_disks(mddev
, n
);
1978 mddev
->raid_disks
= n
;
1979 return rv
? rv
: len
;
1981 static struct md_sysfs_entry md_raid_disks
=
1982 __ATTR(raid_disks
, 0644, raid_disks_show
, raid_disks_store
);
1985 chunk_size_show(mddev_t
*mddev
, char *page
)
1987 return sprintf(page
, "%d\n", mddev
->chunk_size
);
1991 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1993 /* can only set chunk_size if array is not yet active */
1995 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1999 if (!*buf
|| (*e
&& *e
!= '\n'))
2002 mddev
->chunk_size
= n
;
2005 static struct md_sysfs_entry md_chunk_size
=
2006 __ATTR(chunk_size
, 0644, chunk_size_show
, chunk_size_store
);
2009 null_show(mddev_t
*mddev
, char *page
)
2015 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2017 /* buf must be %d:%d\n? giving major and minor numbers */
2018 /* The new device is added to the array.
2019 * If the array has a persistent superblock, we read the
2020 * superblock to initialise info and check validity.
2021 * Otherwise, only checking done is that in bind_rdev_to_array,
2022 * which mainly checks size.
2025 int major
= simple_strtoul(buf
, &e
, 10);
2031 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2033 minor
= simple_strtoul(e
+1, &e
, 10);
2034 if (*e
&& *e
!= '\n')
2036 dev
= MKDEV(major
, minor
);
2037 if (major
!= MAJOR(dev
) ||
2038 minor
!= MINOR(dev
))
2042 if (mddev
->persistent
) {
2043 rdev
= md_import_device(dev
, mddev
->major_version
,
2044 mddev
->minor_version
);
2045 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2046 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2047 mdk_rdev_t
, same_set
);
2048 err
= super_types
[mddev
->major_version
]
2049 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2054 rdev
= md_import_device(dev
, -1, -1);
2057 return PTR_ERR(rdev
);
2058 err
= bind_rdev_to_array(rdev
, mddev
);
2062 return err
? err
: len
;
2065 static struct md_sysfs_entry md_new_device
=
2066 __ATTR(new_dev
, 0200, null_show
, new_dev_store
);
2069 size_show(mddev_t
*mddev
, char *page
)
2071 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2074 static int update_size(mddev_t
*mddev
, unsigned long size
);
2077 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2079 /* If array is inactive, we can reduce the component size, but
2080 * not increase it (except from 0).
2081 * If array is active, we can try an on-line resize
2085 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2086 if (!*buf
|| *buf
== '\n' ||
2091 err
= update_size(mddev
, size
);
2092 md_update_sb(mddev
);
2094 if (mddev
->size
== 0 ||
2100 return err
? err
: len
;
2103 static struct md_sysfs_entry md_size
=
2104 __ATTR(component_size
, 0644, size_show
, size_store
);
2108 * This is either 'none' for arrays with externally managed metadata,
2109 * or N.M for internally known formats
2112 metadata_show(mddev_t
*mddev
, char *page
)
2114 if (mddev
->persistent
)
2115 return sprintf(page
, "%d.%d\n",
2116 mddev
->major_version
, mddev
->minor_version
);
2118 return sprintf(page
, "none\n");
2122 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2126 if (!list_empty(&mddev
->disks
))
2129 if (cmd_match(buf
, "none")) {
2130 mddev
->persistent
= 0;
2131 mddev
->major_version
= 0;
2132 mddev
->minor_version
= 90;
2135 major
= simple_strtoul(buf
, &e
, 10);
2136 if (e
==buf
|| *e
!= '.')
2139 minor
= simple_strtoul(buf
, &e
, 10);
2140 if (e
==buf
|| *e
!= '\n')
2142 if (major
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2143 super_types
[major
].name
== NULL
)
2145 mddev
->major_version
= major
;
2146 mddev
->minor_version
= minor
;
2147 mddev
->persistent
= 1;
2151 static struct md_sysfs_entry md_metadata
=
2152 __ATTR(metadata_version
, 0644, metadata_show
, metadata_store
);
2155 action_show(mddev_t
*mddev
, char *page
)
2157 char *type
= "idle";
2158 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2159 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2160 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2161 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2163 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2170 return sprintf(page
, "%s\n", type
);
2174 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2176 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2179 if (cmd_match(page
, "idle")) {
2180 if (mddev
->sync_thread
) {
2181 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2182 md_unregister_thread(mddev
->sync_thread
);
2183 mddev
->sync_thread
= NULL
;
2184 mddev
->recovery
= 0;
2186 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2187 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2189 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2190 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2192 if (cmd_match(page
, "check"))
2193 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2194 else if (cmd_match(page
, "repair"))
2196 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2197 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2199 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2200 md_wakeup_thread(mddev
->thread
);
2205 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2207 return sprintf(page
, "%llu\n",
2208 (unsigned long long) mddev
->resync_mismatches
);
2211 static struct md_sysfs_entry
2212 md_scan_mode
= __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2215 static struct md_sysfs_entry
2216 md_mismatches
= __ATTR_RO(mismatch_cnt
);
2219 sync_min_show(mddev_t
*mddev
, char *page
)
2221 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2222 mddev
->sync_speed_min
? "local": "system");
2226 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2230 if (strncmp(buf
, "system", 6)==0) {
2231 mddev
->sync_speed_min
= 0;
2234 min
= simple_strtoul(buf
, &e
, 10);
2235 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2237 mddev
->sync_speed_min
= min
;
2241 static struct md_sysfs_entry md_sync_min
=
2242 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2245 sync_max_show(mddev_t
*mddev
, char *page
)
2247 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2248 mddev
->sync_speed_max
? "local": "system");
2252 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2256 if (strncmp(buf
, "system", 6)==0) {
2257 mddev
->sync_speed_max
= 0;
2260 max
= simple_strtoul(buf
, &e
, 10);
2261 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2263 mddev
->sync_speed_max
= max
;
2267 static struct md_sysfs_entry md_sync_max
=
2268 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2272 sync_speed_show(mddev_t
*mddev
, char *page
)
2274 unsigned long resync
, dt
, db
;
2275 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2276 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2278 db
= resync
- (mddev
->resync_mark_cnt
);
2279 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2282 static struct md_sysfs_entry
2283 md_sync_speed
= __ATTR_RO(sync_speed
);
2286 sync_completed_show(mddev_t
*mddev
, char *page
)
2288 unsigned long max_blocks
, resync
;
2290 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2291 max_blocks
= mddev
->resync_max_sectors
;
2293 max_blocks
= mddev
->size
<< 1;
2295 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2296 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2299 static struct md_sysfs_entry
2300 md_sync_completed
= __ATTR_RO(sync_completed
);
2302 static struct attribute
*md_default_attrs
[] = {
2304 &md_raid_disks
.attr
,
2305 &md_chunk_size
.attr
,
2308 &md_new_device
.attr
,
2312 static struct attribute
*md_redundancy_attrs
[] = {
2314 &md_mismatches
.attr
,
2317 &md_sync_speed
.attr
,
2318 &md_sync_completed
.attr
,
2321 static struct attribute_group md_redundancy_group
= {
2323 .attrs
= md_redundancy_attrs
,
2328 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2330 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2331 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2337 rv
= entry
->show(mddev
, page
);
2338 mddev_unlock(mddev
);
2343 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2344 const char *page
, size_t length
)
2346 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2347 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2353 rv
= entry
->store(mddev
, page
, length
);
2354 mddev_unlock(mddev
);
2358 static void md_free(struct kobject
*ko
)
2360 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
2364 static struct sysfs_ops md_sysfs_ops
= {
2365 .show
= md_attr_show
,
2366 .store
= md_attr_store
,
2368 static struct kobj_type md_ktype
= {
2370 .sysfs_ops
= &md_sysfs_ops
,
2371 .default_attrs
= md_default_attrs
,
2376 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
2378 static DECLARE_MUTEX(disks_sem
);
2379 mddev_t
*mddev
= mddev_find(dev
);
2380 struct gendisk
*disk
;
2381 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
2382 int shift
= partitioned
? MdpMinorShift
: 0;
2383 int unit
= MINOR(dev
) >> shift
;
2389 if (mddev
->gendisk
) {
2394 disk
= alloc_disk(1 << shift
);
2400 disk
->major
= MAJOR(dev
);
2401 disk
->first_minor
= unit
<< shift
;
2403 sprintf(disk
->disk_name
, "md_d%d", unit
);
2404 sprintf(disk
->devfs_name
, "md/d%d", unit
);
2406 sprintf(disk
->disk_name
, "md%d", unit
);
2407 sprintf(disk
->devfs_name
, "md/%d", unit
);
2409 disk
->fops
= &md_fops
;
2410 disk
->private_data
= mddev
;
2411 disk
->queue
= mddev
->queue
;
2413 mddev
->gendisk
= disk
;
2415 mddev
->kobj
.parent
= &disk
->kobj
;
2416 mddev
->kobj
.k_name
= NULL
;
2417 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
2418 mddev
->kobj
.ktype
= &md_ktype
;
2419 kobject_register(&mddev
->kobj
);
2423 void md_wakeup_thread(mdk_thread_t
*thread
);
2425 static void md_safemode_timeout(unsigned long data
)
2427 mddev_t
*mddev
= (mddev_t
*) data
;
2429 mddev
->safemode
= 1;
2430 md_wakeup_thread(mddev
->thread
);
2433 static int start_dirty_degraded
;
2435 static int do_md_run(mddev_t
* mddev
)
2439 struct list_head
*tmp
;
2441 struct gendisk
*disk
;
2442 struct mdk_personality
*pers
;
2443 char b
[BDEVNAME_SIZE
];
2445 if (list_empty(&mddev
->disks
))
2446 /* cannot run an array with no devices.. */
2453 * Analyze all RAID superblock(s)
2455 if (!mddev
->raid_disks
)
2458 chunk_size
= mddev
->chunk_size
;
2461 if (chunk_size
> MAX_CHUNK_SIZE
) {
2462 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
2463 chunk_size
, MAX_CHUNK_SIZE
);
2467 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2469 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
2470 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
2473 if (chunk_size
< PAGE_SIZE
) {
2474 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
2475 chunk_size
, PAGE_SIZE
);
2479 /* devices must have minimum size of one chunk */
2480 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2481 if (test_bit(Faulty
, &rdev
->flags
))
2483 if (rdev
->size
< chunk_size
/ 1024) {
2485 "md: Dev %s smaller than chunk_size:"
2487 bdevname(rdev
->bdev
,b
),
2488 (unsigned long long)rdev
->size
,
2496 if (mddev
->level
!= LEVEL_NONE
)
2497 request_module("md-level-%d", mddev
->level
);
2498 else if (mddev
->clevel
[0])
2499 request_module("md-%s", mddev
->clevel
);
2503 * Drop all container device buffers, from now on
2504 * the only valid external interface is through the md
2506 * Also find largest hardsector size
2508 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2509 if (test_bit(Faulty
, &rdev
->flags
))
2511 sync_blockdev(rdev
->bdev
);
2512 invalidate_bdev(rdev
->bdev
, 0);
2515 md_probe(mddev
->unit
, NULL
, NULL
);
2516 disk
= mddev
->gendisk
;
2520 spin_lock(&pers_lock
);
2521 pers
= find_pers(mddev
->level
, mddev
->clevel
);
2522 if (!pers
|| !try_module_get(pers
->owner
)) {
2523 spin_unlock(&pers_lock
);
2524 if (mddev
->level
!= LEVEL_NONE
)
2525 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
2528 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
2533 spin_unlock(&pers_lock
);
2534 mddev
->level
= pers
->level
;
2535 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2537 mddev
->recovery
= 0;
2538 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
2539 mddev
->barriers_work
= 1;
2540 mddev
->ok_start_degraded
= start_dirty_degraded
;
2543 mddev
->ro
= 2; /* read-only, but switch on first write */
2545 err
= mddev
->pers
->run(mddev
);
2546 if (!err
&& mddev
->pers
->sync_request
) {
2547 err
= bitmap_create(mddev
);
2549 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
2550 mdname(mddev
), err
);
2551 mddev
->pers
->stop(mddev
);
2555 printk(KERN_ERR
"md: pers->run() failed ...\n");
2556 module_put(mddev
->pers
->owner
);
2558 bitmap_destroy(mddev
);
2561 if (mddev
->pers
->sync_request
)
2562 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
);
2563 else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
2566 atomic_set(&mddev
->writes_pending
,0);
2567 mddev
->safemode
= 0;
2568 mddev
->safemode_timer
.function
= md_safemode_timeout
;
2569 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
2570 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
2573 ITERATE_RDEV(mddev
,rdev
,tmp
)
2574 if (rdev
->raid_disk
>= 0) {
2576 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2577 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
2580 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2581 md_wakeup_thread(mddev
->thread
);
2583 if (mddev
->sb_dirty
)
2584 md_update_sb(mddev
);
2586 set_capacity(disk
, mddev
->array_size
<<1);
2588 /* If we call blk_queue_make_request here, it will
2589 * re-initialise max_sectors etc which may have been
2590 * refined inside -> run. So just set the bits we need to set.
2591 * Most initialisation happended when we called
2592 * blk_queue_make_request(..., md_fail_request)
2595 mddev
->queue
->queuedata
= mddev
;
2596 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
2599 md_new_event(mddev
);
2603 static int restart_array(mddev_t
*mddev
)
2605 struct gendisk
*disk
= mddev
->gendisk
;
2609 * Complain if it has no devices
2612 if (list_empty(&mddev
->disks
))
2620 mddev
->safemode
= 0;
2622 set_disk_ro(disk
, 0);
2624 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
2627 * Kick recovery or resync if necessary
2629 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2630 md_wakeup_thread(mddev
->thread
);
2633 printk(KERN_ERR
"md: %s has no personality assigned.\n",
2642 static int do_md_stop(mddev_t
* mddev
, int ro
)
2645 struct gendisk
*disk
= mddev
->gendisk
;
2648 if (atomic_read(&mddev
->active
)>2) {
2649 printk("md: %s still in use.\n",mdname(mddev
));
2653 if (mddev
->sync_thread
) {
2654 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2655 md_unregister_thread(mddev
->sync_thread
);
2656 mddev
->sync_thread
= NULL
;
2659 del_timer_sync(&mddev
->safemode_timer
);
2661 invalidate_partition(disk
, 0);
2669 bitmap_flush(mddev
);
2670 md_super_wait(mddev
);
2672 set_disk_ro(disk
, 0);
2673 blk_queue_make_request(mddev
->queue
, md_fail_request
);
2674 mddev
->pers
->stop(mddev
);
2675 if (mddev
->pers
->sync_request
)
2676 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
2678 module_put(mddev
->pers
->owner
);
2683 if (!mddev
->in_sync
) {
2684 /* mark array as shutdown cleanly */
2686 md_update_sb(mddev
);
2689 set_disk_ro(disk
, 1);
2692 bitmap_destroy(mddev
);
2693 if (mddev
->bitmap_file
) {
2694 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
2695 fput(mddev
->bitmap_file
);
2696 mddev
->bitmap_file
= NULL
;
2698 mddev
->bitmap_offset
= 0;
2701 * Free resources if final stop
2705 struct list_head
*tmp
;
2706 struct gendisk
*disk
;
2707 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
2709 ITERATE_RDEV(mddev
,rdev
,tmp
)
2710 if (rdev
->raid_disk
>= 0) {
2712 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2713 sysfs_remove_link(&mddev
->kobj
, nm
);
2716 export_array(mddev
);
2718 mddev
->array_size
= 0;
2719 disk
= mddev
->gendisk
;
2721 set_capacity(disk
, 0);
2724 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
2727 md_new_event(mddev
);
2732 static void autorun_array(mddev_t
*mddev
)
2735 struct list_head
*tmp
;
2738 if (list_empty(&mddev
->disks
))
2741 printk(KERN_INFO
"md: running: ");
2743 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2744 char b
[BDEVNAME_SIZE
];
2745 printk("<%s>", bdevname(rdev
->bdev
,b
));
2749 err
= do_md_run (mddev
);
2751 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
2752 do_md_stop (mddev
, 0);
2757 * lets try to run arrays based on all disks that have arrived
2758 * until now. (those are in pending_raid_disks)
2760 * the method: pick the first pending disk, collect all disks with
2761 * the same UUID, remove all from the pending list and put them into
2762 * the 'same_array' list. Then order this list based on superblock
2763 * update time (freshest comes first), kick out 'old' disks and
2764 * compare superblocks. If everything's fine then run it.
2766 * If "unit" is allocated, then bump its reference count
2768 static void autorun_devices(int part
)
2770 struct list_head candidates
;
2771 struct list_head
*tmp
;
2772 mdk_rdev_t
*rdev0
, *rdev
;
2774 char b
[BDEVNAME_SIZE
];
2776 printk(KERN_INFO
"md: autorun ...\n");
2777 while (!list_empty(&pending_raid_disks
)) {
2779 rdev0
= list_entry(pending_raid_disks
.next
,
2780 mdk_rdev_t
, same_set
);
2782 printk(KERN_INFO
"md: considering %s ...\n",
2783 bdevname(rdev0
->bdev
,b
));
2784 INIT_LIST_HEAD(&candidates
);
2785 ITERATE_RDEV_PENDING(rdev
,tmp
)
2786 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
2787 printk(KERN_INFO
"md: adding %s ...\n",
2788 bdevname(rdev
->bdev
,b
));
2789 list_move(&rdev
->same_set
, &candidates
);
2792 * now we have a set of devices, with all of them having
2793 * mostly sane superblocks. It's time to allocate the
2796 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
2797 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
2798 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
2802 dev
= MKDEV(mdp_major
,
2803 rdev0
->preferred_minor
<< MdpMinorShift
);
2805 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
2807 md_probe(dev
, NULL
, NULL
);
2808 mddev
= mddev_find(dev
);
2811 "md: cannot allocate memory for md drive.\n");
2814 if (mddev_lock(mddev
))
2815 printk(KERN_WARNING
"md: %s locked, cannot run\n",
2817 else if (mddev
->raid_disks
|| mddev
->major_version
2818 || !list_empty(&mddev
->disks
)) {
2820 "md: %s already running, cannot run %s\n",
2821 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
2822 mddev_unlock(mddev
);
2824 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
2825 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
2826 list_del_init(&rdev
->same_set
);
2827 if (bind_rdev_to_array(rdev
, mddev
))
2830 autorun_array(mddev
);
2831 mddev_unlock(mddev
);
2833 /* on success, candidates will be empty, on error
2836 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
2840 printk(KERN_INFO
"md: ... autorun DONE.\n");
2844 * import RAID devices based on one partition
2845 * if possible, the array gets run as well.
2848 static int autostart_array(dev_t startdev
)
2850 char b
[BDEVNAME_SIZE
];
2851 int err
= -EINVAL
, i
;
2852 mdp_super_t
*sb
= NULL
;
2853 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
2855 start_rdev
= md_import_device(startdev
, 0, 0);
2856 if (IS_ERR(start_rdev
))
2860 /* NOTE: this can only work for 0.90.0 superblocks */
2861 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
2862 if (sb
->major_version
!= 0 ||
2863 sb
->minor_version
!= 90 ) {
2864 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
2865 export_rdev(start_rdev
);
2869 if (test_bit(Faulty
, &start_rdev
->flags
)) {
2871 "md: can not autostart based on faulty %s!\n",
2872 bdevname(start_rdev
->bdev
,b
));
2873 export_rdev(start_rdev
);
2876 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
2878 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2879 mdp_disk_t
*desc
= sb
->disks
+ i
;
2880 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
2884 if (dev
== startdev
)
2886 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
2888 rdev
= md_import_device(dev
, 0, 0);
2892 list_add(&rdev
->same_set
, &pending_raid_disks
);
2896 * possibly return codes
2904 static int get_version(void __user
* arg
)
2908 ver
.major
= MD_MAJOR_VERSION
;
2909 ver
.minor
= MD_MINOR_VERSION
;
2910 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
2912 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
2918 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
2920 mdu_array_info_t info
;
2921 int nr
,working
,active
,failed
,spare
;
2923 struct list_head
*tmp
;
2925 nr
=working
=active
=failed
=spare
=0;
2926 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2928 if (test_bit(Faulty
, &rdev
->flags
))
2932 if (test_bit(In_sync
, &rdev
->flags
))
2939 info
.major_version
= mddev
->major_version
;
2940 info
.minor_version
= mddev
->minor_version
;
2941 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
2942 info
.ctime
= mddev
->ctime
;
2943 info
.level
= mddev
->level
;
2944 info
.size
= mddev
->size
;
2946 info
.raid_disks
= mddev
->raid_disks
;
2947 info
.md_minor
= mddev
->md_minor
;
2948 info
.not_persistent
= !mddev
->persistent
;
2950 info
.utime
= mddev
->utime
;
2953 info
.state
= (1<<MD_SB_CLEAN
);
2954 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2955 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
2956 info
.active_disks
= active
;
2957 info
.working_disks
= working
;
2958 info
.failed_disks
= failed
;
2959 info
.spare_disks
= spare
;
2961 info
.layout
= mddev
->layout
;
2962 info
.chunk_size
= mddev
->chunk_size
;
2964 if (copy_to_user(arg
, &info
, sizeof(info
)))
2970 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
2972 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
2973 char *ptr
, *buf
= NULL
;
2976 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
2980 /* bitmap disabled, zero the first byte and copy out */
2981 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
2982 file
->pathname
[0] = '\0';
2986 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
2990 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
2994 strcpy(file
->pathname
, ptr
);
2998 if (copy_to_user(arg
, file
, sizeof(*file
)))
3006 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3008 mdu_disk_info_t info
;
3012 if (copy_from_user(&info
, arg
, sizeof(info
)))
3017 rdev
= find_rdev_nr(mddev
, nr
);
3019 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3020 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3021 info
.raid_disk
= rdev
->raid_disk
;
3023 if (test_bit(Faulty
, &rdev
->flags
))
3024 info
.state
|= (1<<MD_DISK_FAULTY
);
3025 else if (test_bit(In_sync
, &rdev
->flags
)) {
3026 info
.state
|= (1<<MD_DISK_ACTIVE
);
3027 info
.state
|= (1<<MD_DISK_SYNC
);
3029 if (test_bit(WriteMostly
, &rdev
->flags
))
3030 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3032 info
.major
= info
.minor
= 0;
3033 info
.raid_disk
= -1;
3034 info
.state
= (1<<MD_DISK_REMOVED
);
3037 if (copy_to_user(arg
, &info
, sizeof(info
)))
3043 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3045 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3047 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3049 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3052 if (!mddev
->raid_disks
) {
3054 /* expecting a device which has a superblock */
3055 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3058 "md: md_import_device returned %ld\n",
3060 return PTR_ERR(rdev
);
3062 if (!list_empty(&mddev
->disks
)) {
3063 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3064 mdk_rdev_t
, same_set
);
3065 int err
= super_types
[mddev
->major_version
]
3066 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3069 "md: %s has different UUID to %s\n",
3070 bdevname(rdev
->bdev
,b
),
3071 bdevname(rdev0
->bdev
,b2
));
3076 err
= bind_rdev_to_array(rdev
, mddev
);
3083 * add_new_disk can be used once the array is assembled
3084 * to add "hot spares". They must already have a superblock
3089 if (!mddev
->pers
->hot_add_disk
) {
3091 "%s: personality does not support diskops!\n",
3095 if (mddev
->persistent
)
3096 rdev
= md_import_device(dev
, mddev
->major_version
,
3097 mddev
->minor_version
);
3099 rdev
= md_import_device(dev
, -1, -1);
3102 "md: md_import_device returned %ld\n",
3104 return PTR_ERR(rdev
);
3106 /* set save_raid_disk if appropriate */
3107 if (!mddev
->persistent
) {
3108 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3109 info
->raid_disk
< mddev
->raid_disks
)
3110 rdev
->raid_disk
= info
->raid_disk
;
3112 rdev
->raid_disk
= -1;
3114 super_types
[mddev
->major_version
].
3115 validate_super(mddev
, rdev
);
3116 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3118 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3119 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3120 set_bit(WriteMostly
, &rdev
->flags
);
3122 rdev
->raid_disk
= -1;
3123 err
= bind_rdev_to_array(rdev
, mddev
);
3127 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3128 md_wakeup_thread(mddev
->thread
);
3132 /* otherwise, add_new_disk is only allowed
3133 * for major_version==0 superblocks
3135 if (mddev
->major_version
!= 0) {
3136 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3141 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3143 rdev
= md_import_device (dev
, -1, 0);
3146 "md: error, md_import_device() returned %ld\n",
3148 return PTR_ERR(rdev
);
3150 rdev
->desc_nr
= info
->number
;
3151 if (info
->raid_disk
< mddev
->raid_disks
)
3152 rdev
->raid_disk
= info
->raid_disk
;
3154 rdev
->raid_disk
= -1;
3158 if (rdev
->raid_disk
< mddev
->raid_disks
)
3159 if (info
->state
& (1<<MD_DISK_SYNC
))
3160 set_bit(In_sync
, &rdev
->flags
);
3162 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3163 set_bit(WriteMostly
, &rdev
->flags
);
3165 if (!mddev
->persistent
) {
3166 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3167 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3169 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3170 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3172 err
= bind_rdev_to_array(rdev
, mddev
);
3182 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3184 char b
[BDEVNAME_SIZE
];
3190 rdev
= find_rdev(mddev
, dev
);
3194 if (rdev
->raid_disk
>= 0)
3197 kick_rdev_from_array(rdev
);
3198 md_update_sb(mddev
);
3199 md_new_event(mddev
);
3203 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3204 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3208 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3210 char b
[BDEVNAME_SIZE
];
3218 if (mddev
->major_version
!= 0) {
3219 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3220 " version-0 superblocks.\n",
3224 if (!mddev
->pers
->hot_add_disk
) {
3226 "%s: personality does not support diskops!\n",
3231 rdev
= md_import_device (dev
, -1, 0);
3234 "md: error, md_import_device() returned %ld\n",
3239 if (mddev
->persistent
)
3240 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3243 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3245 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3248 if (test_bit(Faulty
, &rdev
->flags
)) {
3250 "md: can not hot-add faulty %s disk to %s!\n",
3251 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3255 clear_bit(In_sync
, &rdev
->flags
);
3257 err
= bind_rdev_to_array(rdev
, mddev
);
3262 * The rest should better be atomic, we can have disk failures
3263 * noticed in interrupt contexts ...
3266 if (rdev
->desc_nr
== mddev
->max_disks
) {
3267 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
3270 goto abort_unbind_export
;
3273 rdev
->raid_disk
= -1;
3275 md_update_sb(mddev
);
3278 * Kick recovery, maybe this spare has to be added to the
3279 * array immediately.
3281 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3282 md_wakeup_thread(mddev
->thread
);
3283 md_new_event(mddev
);
3286 abort_unbind_export
:
3287 unbind_rdev_from_array(rdev
);
3294 /* similar to deny_write_access, but accounts for our holding a reference
3295 * to the file ourselves */
3296 static int deny_bitmap_write_access(struct file
* file
)
3298 struct inode
*inode
= file
->f_mapping
->host
;
3300 spin_lock(&inode
->i_lock
);
3301 if (atomic_read(&inode
->i_writecount
) > 1) {
3302 spin_unlock(&inode
->i_lock
);
3305 atomic_set(&inode
->i_writecount
, -1);
3306 spin_unlock(&inode
->i_lock
);
3311 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
3316 if (!mddev
->pers
->quiesce
)
3318 if (mddev
->recovery
|| mddev
->sync_thread
)
3320 /* we should be able to change the bitmap.. */
3326 return -EEXIST
; /* cannot add when bitmap is present */
3327 mddev
->bitmap_file
= fget(fd
);
3329 if (mddev
->bitmap_file
== NULL
) {
3330 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
3335 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
3337 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
3339 fput(mddev
->bitmap_file
);
3340 mddev
->bitmap_file
= NULL
;
3343 mddev
->bitmap_offset
= 0; /* file overrides offset */
3344 } else if (mddev
->bitmap
== NULL
)
3345 return -ENOENT
; /* cannot remove what isn't there */
3348 mddev
->pers
->quiesce(mddev
, 1);
3350 err
= bitmap_create(mddev
);
3352 bitmap_destroy(mddev
);
3353 mddev
->pers
->quiesce(mddev
, 0);
3354 } else if (fd
< 0) {
3355 if (mddev
->bitmap_file
)
3356 fput(mddev
->bitmap_file
);
3357 mddev
->bitmap_file
= NULL
;
3364 * set_array_info is used two different ways
3365 * The original usage is when creating a new array.
3366 * In this usage, raid_disks is > 0 and it together with
3367 * level, size, not_persistent,layout,chunksize determine the
3368 * shape of the array.
3369 * This will always create an array with a type-0.90.0 superblock.
3370 * The newer usage is when assembling an array.
3371 * In this case raid_disks will be 0, and the major_version field is
3372 * use to determine which style super-blocks are to be found on the devices.
3373 * The minor and patch _version numbers are also kept incase the
3374 * super_block handler wishes to interpret them.
3376 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
3379 if (info
->raid_disks
== 0) {
3380 /* just setting version number for superblock loading */
3381 if (info
->major_version
< 0 ||
3382 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
3383 super_types
[info
->major_version
].name
== NULL
) {
3384 /* maybe try to auto-load a module? */
3386 "md: superblock version %d not known\n",
3387 info
->major_version
);
3390 mddev
->major_version
= info
->major_version
;
3391 mddev
->minor_version
= info
->minor_version
;
3392 mddev
->patch_version
= info
->patch_version
;
3395 mddev
->major_version
= MD_MAJOR_VERSION
;
3396 mddev
->minor_version
= MD_MINOR_VERSION
;
3397 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
3398 mddev
->ctime
= get_seconds();
3400 mddev
->level
= info
->level
;
3401 mddev
->clevel
[0] = 0;
3402 mddev
->size
= info
->size
;
3403 mddev
->raid_disks
= info
->raid_disks
;
3404 /* don't set md_minor, it is determined by which /dev/md* was
3407 if (info
->state
& (1<<MD_SB_CLEAN
))
3408 mddev
->recovery_cp
= MaxSector
;
3410 mddev
->recovery_cp
= 0;
3411 mddev
->persistent
= ! info
->not_persistent
;
3413 mddev
->layout
= info
->layout
;
3414 mddev
->chunk_size
= info
->chunk_size
;
3416 mddev
->max_disks
= MD_SB_DISKS
;
3418 mddev
->sb_dirty
= 1;
3420 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
3421 mddev
->bitmap_offset
= 0;
3424 * Generate a 128 bit UUID
3426 get_random_bytes(mddev
->uuid
, 16);
3431 static int update_size(mddev_t
*mddev
, unsigned long size
)
3435 struct list_head
*tmp
;
3437 if (mddev
->pers
->resize
== NULL
)
3439 /* The "size" is the amount of each device that is used.
3440 * This can only make sense for arrays with redundancy.
3441 * linear and raid0 always use whatever space is available
3442 * We can only consider changing the size if no resync
3443 * or reconstruction is happening, and if the new size
3444 * is acceptable. It must fit before the sb_offset or,
3445 * if that is <data_offset, it must fit before the
3446 * size of each device.
3447 * If size is zero, we find the largest size that fits.
3449 if (mddev
->sync_thread
)
3451 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3453 int fit
= (size
== 0);
3454 if (rdev
->sb_offset
> rdev
->data_offset
)
3455 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
3457 avail
= get_capacity(rdev
->bdev
->bd_disk
)
3458 - rdev
->data_offset
;
3459 if (fit
&& (size
== 0 || size
> avail
/2))
3461 if (avail
< ((sector_t
)size
<< 1))
3464 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
3466 struct block_device
*bdev
;
3468 bdev
= bdget_disk(mddev
->gendisk
, 0);
3470 mutex_lock(&bdev
->bd_inode
->i_mutex
);
3471 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
3472 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
3479 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
3482 /* change the number of raid disks */
3483 if (mddev
->pers
->reshape
== NULL
)
3485 if (raid_disks
<= 0 ||
3486 raid_disks
>= mddev
->max_disks
)
3488 if (mddev
->sync_thread
)
3490 rv
= mddev
->pers
->reshape(mddev
, raid_disks
);
3496 * update_array_info is used to change the configuration of an
3498 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3499 * fields in the info are checked against the array.
3500 * Any differences that cannot be handled will cause an error.
3501 * Normally, only one change can be managed at a time.
3503 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
3509 /* calculate expected state,ignoring low bits */
3510 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3511 state
|= (1 << MD_SB_BITMAP_PRESENT
);
3513 if (mddev
->major_version
!= info
->major_version
||
3514 mddev
->minor_version
!= info
->minor_version
||
3515 /* mddev->patch_version != info->patch_version || */
3516 mddev
->ctime
!= info
->ctime
||
3517 mddev
->level
!= info
->level
||
3518 /* mddev->layout != info->layout || */
3519 !mddev
->persistent
!= info
->not_persistent
||
3520 mddev
->chunk_size
!= info
->chunk_size
||
3521 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3522 ((state
^info
->state
) & 0xfffffe00)
3525 /* Check there is only one change */
3526 if (mddev
->size
!= info
->size
) cnt
++;
3527 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
3528 if (mddev
->layout
!= info
->layout
) cnt
++;
3529 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
3530 if (cnt
== 0) return 0;
3531 if (cnt
> 1) return -EINVAL
;
3533 if (mddev
->layout
!= info
->layout
) {
3535 * we don't need to do anything at the md level, the
3536 * personality will take care of it all.
3538 if (mddev
->pers
->reconfig
== NULL
)
3541 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
3543 if (mddev
->size
!= info
->size
)
3544 rv
= update_size(mddev
, info
->size
);
3546 if (mddev
->raid_disks
!= info
->raid_disks
)
3547 rv
= update_raid_disks(mddev
, info
->raid_disks
);
3549 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
3550 if (mddev
->pers
->quiesce
== NULL
)
3552 if (mddev
->recovery
|| mddev
->sync_thread
)
3554 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
3555 /* add the bitmap */
3558 if (mddev
->default_bitmap_offset
== 0)
3560 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
3561 mddev
->pers
->quiesce(mddev
, 1);
3562 rv
= bitmap_create(mddev
);
3564 bitmap_destroy(mddev
);
3565 mddev
->pers
->quiesce(mddev
, 0);
3567 /* remove the bitmap */
3570 if (mddev
->bitmap
->file
)
3572 mddev
->pers
->quiesce(mddev
, 1);
3573 bitmap_destroy(mddev
);
3574 mddev
->pers
->quiesce(mddev
, 0);
3575 mddev
->bitmap_offset
= 0;
3578 md_update_sb(mddev
);
3582 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
3586 if (mddev
->pers
== NULL
)
3589 rdev
= find_rdev(mddev
, dev
);
3593 md_error(mddev
, rdev
);
3597 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3599 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
3603 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
3607 static int md_ioctl(struct inode
*inode
, struct file
*file
,
3608 unsigned int cmd
, unsigned long arg
)
3611 void __user
*argp
= (void __user
*)arg
;
3612 mddev_t
*mddev
= NULL
;
3614 if (!capable(CAP_SYS_ADMIN
))
3618 * Commands dealing with the RAID driver but not any
3624 err
= get_version(argp
);
3627 case PRINT_RAID_DEBUG
:
3635 autostart_arrays(arg
);
3642 * Commands creating/starting a new array:
3645 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3653 if (cmd
== START_ARRAY
) {
3654 /* START_ARRAY doesn't need to lock the array as autostart_array
3655 * does the locking, and it could even be a different array
3660 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3661 "This will not be supported beyond July 2006\n",
3662 current
->comm
, current
->pid
);
3665 err
= autostart_array(new_decode_dev(arg
));
3667 printk(KERN_WARNING
"md: autostart failed!\n");
3673 err
= mddev_lock(mddev
);
3676 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3683 case SET_ARRAY_INFO
:
3685 mdu_array_info_t info
;
3687 memset(&info
, 0, sizeof(info
));
3688 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
3693 err
= update_array_info(mddev
, &info
);
3695 printk(KERN_WARNING
"md: couldn't update"
3696 " array info. %d\n", err
);
3701 if (!list_empty(&mddev
->disks
)) {
3703 "md: array %s already has disks!\n",
3708 if (mddev
->raid_disks
) {
3710 "md: array %s already initialised!\n",
3715 err
= set_array_info(mddev
, &info
);
3717 printk(KERN_WARNING
"md: couldn't set"
3718 " array info. %d\n", err
);
3728 * Commands querying/configuring an existing array:
3730 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3731 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3732 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
3733 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
3739 * Commands even a read-only array can execute:
3743 case GET_ARRAY_INFO
:
3744 err
= get_array_info(mddev
, argp
);
3747 case GET_BITMAP_FILE
:
3748 err
= get_bitmap_file(mddev
, argp
);
3752 err
= get_disk_info(mddev
, argp
);
3755 case RESTART_ARRAY_RW
:
3756 err
= restart_array(mddev
);
3760 err
= do_md_stop (mddev
, 0);
3764 err
= do_md_stop (mddev
, 1);
3768 * We have a problem here : there is no easy way to give a CHS
3769 * virtual geometry. We currently pretend that we have a 2 heads
3770 * 4 sectors (with a BIG number of cylinders...). This drives
3771 * dosfs just mad... ;-)
3776 * The remaining ioctls are changing the state of the
3777 * superblock, so we do not allow them on read-only arrays.
3778 * However non-MD ioctls (e.g. get-size) will still come through
3779 * here and hit the 'default' below, so only disallow
3780 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3782 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
3783 mddev
->ro
&& mddev
->pers
) {
3784 if (mddev
->ro
== 2) {
3786 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3787 md_wakeup_thread(mddev
->thread
);
3799 mdu_disk_info_t info
;
3800 if (copy_from_user(&info
, argp
, sizeof(info
)))
3803 err
= add_new_disk(mddev
, &info
);
3807 case HOT_REMOVE_DISK
:
3808 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
3812 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
3815 case SET_DISK_FAULTY
:
3816 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
3820 err
= do_md_run (mddev
);
3823 case SET_BITMAP_FILE
:
3824 err
= set_bitmap_file(mddev
, (int)arg
);
3828 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
3829 printk(KERN_WARNING
"md: %s(pid %d) used"
3830 " obsolete MD ioctl, upgrade your"
3831 " software to use new ictls.\n",
3832 current
->comm
, current
->pid
);
3839 mddev_unlock(mddev
);
3849 static int md_open(struct inode
*inode
, struct file
*file
)
3852 * Succeed if we can lock the mddev, which confirms that
3853 * it isn't being stopped right now.
3855 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3858 if ((err
= mddev_lock(mddev
)))
3863 mddev_unlock(mddev
);
3865 check_disk_change(inode
->i_bdev
);
3870 static int md_release(struct inode
*inode
, struct file
* file
)
3872 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3881 static int md_media_changed(struct gendisk
*disk
)
3883 mddev_t
*mddev
= disk
->private_data
;
3885 return mddev
->changed
;
3888 static int md_revalidate(struct gendisk
*disk
)
3890 mddev_t
*mddev
= disk
->private_data
;
3895 static struct block_device_operations md_fops
=
3897 .owner
= THIS_MODULE
,
3899 .release
= md_release
,
3901 .getgeo
= md_getgeo
,
3902 .media_changed
= md_media_changed
,
3903 .revalidate_disk
= md_revalidate
,
3906 static int md_thread(void * arg
)
3908 mdk_thread_t
*thread
= arg
;
3911 * md_thread is a 'system-thread', it's priority should be very
3912 * high. We avoid resource deadlocks individually in each
3913 * raid personality. (RAID5 does preallocation) We also use RR and
3914 * the very same RT priority as kswapd, thus we will never get
3915 * into a priority inversion deadlock.
3917 * we definitely have to have equal or higher priority than
3918 * bdflush, otherwise bdflush will deadlock if there are too
3919 * many dirty RAID5 blocks.
3922 allow_signal(SIGKILL
);
3923 while (!kthread_should_stop()) {
3925 /* We need to wait INTERRUPTIBLE so that
3926 * we don't add to the load-average.
3927 * That means we need to be sure no signals are
3930 if (signal_pending(current
))
3931 flush_signals(current
);
3933 wait_event_interruptible_timeout
3935 test_bit(THREAD_WAKEUP
, &thread
->flags
)
3936 || kthread_should_stop(),
3940 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
3942 thread
->run(thread
->mddev
);
3948 void md_wakeup_thread(mdk_thread_t
*thread
)
3951 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
3952 set_bit(THREAD_WAKEUP
, &thread
->flags
);
3953 wake_up(&thread
->wqueue
);
3957 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
3960 mdk_thread_t
*thread
;
3962 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
3966 init_waitqueue_head(&thread
->wqueue
);
3969 thread
->mddev
= mddev
;
3970 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
3971 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
3972 if (IS_ERR(thread
->tsk
)) {
3979 void md_unregister_thread(mdk_thread_t
*thread
)
3981 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
3983 kthread_stop(thread
->tsk
);
3987 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
3994 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
3997 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3999 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4000 __builtin_return_address(0),__builtin_return_address(1),
4001 __builtin_return_address(2),__builtin_return_address(3));
4003 if (!mddev
->pers
->error_handler
)
4005 mddev
->pers
->error_handler(mddev
,rdev
);
4006 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4007 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4008 md_wakeup_thread(mddev
->thread
);
4009 md_new_event(mddev
);
4012 /* seq_file implementation /proc/mdstat */
4014 static void status_unused(struct seq_file
*seq
)
4018 struct list_head
*tmp
;
4020 seq_printf(seq
, "unused devices: ");
4022 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4023 char b
[BDEVNAME_SIZE
];
4025 seq_printf(seq
, "%s ",
4026 bdevname(rdev
->bdev
,b
));
4029 seq_printf(seq
, "<none>");
4031 seq_printf(seq
, "\n");
4035 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4037 unsigned long max_blocks
, resync
, res
, dt
, db
, rt
;
4039 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4041 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4042 max_blocks
= mddev
->resync_max_sectors
>> 1;
4044 max_blocks
= mddev
->size
;
4047 * Should not happen.
4053 res
= (resync
/1024)*1000/(max_blocks
/1024 + 1);
4055 int i
, x
= res
/50, y
= 20-x
;
4056 seq_printf(seq
, "[");
4057 for (i
= 0; i
< x
; i
++)
4058 seq_printf(seq
, "=");
4059 seq_printf(seq
, ">");
4060 for (i
= 0; i
< y
; i
++)
4061 seq_printf(seq
, ".");
4062 seq_printf(seq
, "] ");
4064 seq_printf(seq
, " %s =%3lu.%lu%% (%lu/%lu)",
4065 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4066 "resync" : "recovery"),
4067 res
/10, res
% 10, resync
, max_blocks
);
4070 * We do not want to overflow, so the order of operands and
4071 * the * 100 / 100 trick are important. We do a +1 to be
4072 * safe against division by zero. We only estimate anyway.
4074 * dt: time from mark until now
4075 * db: blocks written from mark until now
4076 * rt: remaining time
4078 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4080 db
= resync
- (mddev
->resync_mark_cnt
/2);
4081 rt
= (dt
* ((max_blocks
-resync
) / (db
/100+1)))/100;
4083 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4085 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
4088 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4090 struct list_head
*tmp
;
4100 spin_lock(&all_mddevs_lock
);
4101 list_for_each(tmp
,&all_mddevs
)
4103 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4105 spin_unlock(&all_mddevs_lock
);
4108 spin_unlock(&all_mddevs_lock
);
4110 return (void*)2;/* tail */
4114 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4116 struct list_head
*tmp
;
4117 mddev_t
*next_mddev
, *mddev
= v
;
4123 spin_lock(&all_mddevs_lock
);
4125 tmp
= all_mddevs
.next
;
4127 tmp
= mddev
->all_mddevs
.next
;
4128 if (tmp
!= &all_mddevs
)
4129 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4131 next_mddev
= (void*)2;
4134 spin_unlock(&all_mddevs_lock
);
4142 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4146 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4150 struct mdstat_info
{
4154 static int md_seq_show(struct seq_file
*seq
, void *v
)
4158 struct list_head
*tmp2
;
4160 struct mdstat_info
*mi
= seq
->private;
4161 struct bitmap
*bitmap
;
4163 if (v
== (void*)1) {
4164 struct mdk_personality
*pers
;
4165 seq_printf(seq
, "Personalities : ");
4166 spin_lock(&pers_lock
);
4167 list_for_each_entry(pers
, &pers_list
, list
)
4168 seq_printf(seq
, "[%s] ", pers
->name
);
4170 spin_unlock(&pers_lock
);
4171 seq_printf(seq
, "\n");
4172 mi
->event
= atomic_read(&md_event_count
);
4175 if (v
== (void*)2) {
4180 if (mddev_lock(mddev
)!=0)
4182 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4183 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4184 mddev
->pers
? "" : "in");
4187 seq_printf(seq
, " (read-only)");
4189 seq_printf(seq
, "(auto-read-only)");
4190 seq_printf(seq
, " %s", mddev
->pers
->name
);
4194 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4195 char b
[BDEVNAME_SIZE
];
4196 seq_printf(seq
, " %s[%d]",
4197 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4198 if (test_bit(WriteMostly
, &rdev
->flags
))
4199 seq_printf(seq
, "(W)");
4200 if (test_bit(Faulty
, &rdev
->flags
)) {
4201 seq_printf(seq
, "(F)");
4203 } else if (rdev
->raid_disk
< 0)
4204 seq_printf(seq
, "(S)"); /* spare */
4208 if (!list_empty(&mddev
->disks
)) {
4210 seq_printf(seq
, "\n %llu blocks",
4211 (unsigned long long)mddev
->array_size
);
4213 seq_printf(seq
, "\n %llu blocks",
4214 (unsigned long long)size
);
4216 if (mddev
->persistent
) {
4217 if (mddev
->major_version
!= 0 ||
4218 mddev
->minor_version
!= 90) {
4219 seq_printf(seq
," super %d.%d",
4220 mddev
->major_version
,
4221 mddev
->minor_version
);
4224 seq_printf(seq
, " super non-persistent");
4227 mddev
->pers
->status (seq
, mddev
);
4228 seq_printf(seq
, "\n ");
4229 if (mddev
->pers
->sync_request
) {
4230 if (mddev
->curr_resync
> 2) {
4231 status_resync (seq
, mddev
);
4232 seq_printf(seq
, "\n ");
4233 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4234 seq_printf(seq
, "\tresync=DELAYED\n ");
4235 else if (mddev
->recovery_cp
< MaxSector
)
4236 seq_printf(seq
, "\tresync=PENDING\n ");
4239 seq_printf(seq
, "\n ");
4241 if ((bitmap
= mddev
->bitmap
)) {
4242 unsigned long chunk_kb
;
4243 unsigned long flags
;
4244 spin_lock_irqsave(&bitmap
->lock
, flags
);
4245 chunk_kb
= bitmap
->chunksize
>> 10;
4246 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4248 bitmap
->pages
- bitmap
->missing_pages
,
4250 (bitmap
->pages
- bitmap
->missing_pages
)
4251 << (PAGE_SHIFT
- 10),
4252 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
4253 chunk_kb
? "KB" : "B");
4255 seq_printf(seq
, ", file: ");
4256 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
4257 bitmap
->file
->f_dentry
," \t\n");
4260 seq_printf(seq
, "\n");
4261 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
4264 seq_printf(seq
, "\n");
4266 mddev_unlock(mddev
);
4271 static struct seq_operations md_seq_ops
= {
4272 .start
= md_seq_start
,
4273 .next
= md_seq_next
,
4274 .stop
= md_seq_stop
,
4275 .show
= md_seq_show
,
4278 static int md_seq_open(struct inode
*inode
, struct file
*file
)
4281 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
4285 error
= seq_open(file
, &md_seq_ops
);
4289 struct seq_file
*p
= file
->private_data
;
4291 mi
->event
= atomic_read(&md_event_count
);
4296 static int md_seq_release(struct inode
*inode
, struct file
*file
)
4298 struct seq_file
*m
= file
->private_data
;
4299 struct mdstat_info
*mi
= m
->private;
4302 return seq_release(inode
, file
);
4305 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
4307 struct seq_file
*m
= filp
->private_data
;
4308 struct mdstat_info
*mi
= m
->private;
4311 poll_wait(filp
, &md_event_waiters
, wait
);
4313 /* always allow read */
4314 mask
= POLLIN
| POLLRDNORM
;
4316 if (mi
->event
!= atomic_read(&md_event_count
))
4317 mask
|= POLLERR
| POLLPRI
;
4321 static struct file_operations md_seq_fops
= {
4322 .open
= md_seq_open
,
4324 .llseek
= seq_lseek
,
4325 .release
= md_seq_release
,
4326 .poll
= mdstat_poll
,
4329 int register_md_personality(struct mdk_personality
*p
)
4331 spin_lock(&pers_lock
);
4332 list_add_tail(&p
->list
, &pers_list
);
4333 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
4334 spin_unlock(&pers_lock
);
4338 int unregister_md_personality(struct mdk_personality
*p
)
4340 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
4341 spin_lock(&pers_lock
);
4342 list_del_init(&p
->list
);
4343 spin_unlock(&pers_lock
);
4347 static int is_mddev_idle(mddev_t
*mddev
)
4350 struct list_head
*tmp
;
4352 unsigned long curr_events
;
4355 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4356 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
4357 curr_events
= disk_stat_read(disk
, sectors
[0]) +
4358 disk_stat_read(disk
, sectors
[1]) -
4359 atomic_read(&disk
->sync_io
);
4360 /* The difference between curr_events and last_events
4361 * will be affected by any new non-sync IO (making
4362 * curr_events bigger) and any difference in the amount of
4363 * in-flight syncio (making current_events bigger or smaller)
4364 * The amount in-flight is currently limited to
4365 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4366 * which is at most 4096 sectors.
4367 * These numbers are fairly fragile and should be made
4368 * more robust, probably by enforcing the
4369 * 'window size' that md_do_sync sort-of uses.
4371 * Note: the following is an unsigned comparison.
4373 if ((curr_events
- rdev
->last_events
+ 4096) > 8192) {
4374 rdev
->last_events
= curr_events
;
4381 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
4383 /* another "blocks" (512byte) blocks have been synced */
4384 atomic_sub(blocks
, &mddev
->recovery_active
);
4385 wake_up(&mddev
->recovery_wait
);
4387 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4388 md_wakeup_thread(mddev
->thread
);
4389 // stop recovery, signal do_sync ....
4394 /* md_write_start(mddev, bi)
4395 * If we need to update some array metadata (e.g. 'active' flag
4396 * in superblock) before writing, schedule a superblock update
4397 * and wait for it to complete.
4399 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
4401 if (bio_data_dir(bi
) != WRITE
)
4404 BUG_ON(mddev
->ro
== 1);
4405 if (mddev
->ro
== 2) {
4406 /* need to switch to read/write */
4408 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4409 md_wakeup_thread(mddev
->thread
);
4411 atomic_inc(&mddev
->writes_pending
);
4412 if (mddev
->in_sync
) {
4413 spin_lock_irq(&mddev
->write_lock
);
4414 if (mddev
->in_sync
) {
4416 mddev
->sb_dirty
= 1;
4417 md_wakeup_thread(mddev
->thread
);
4419 spin_unlock_irq(&mddev
->write_lock
);
4421 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
4424 void md_write_end(mddev_t
*mddev
)
4426 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
4427 if (mddev
->safemode
== 2)
4428 md_wakeup_thread(mddev
->thread
);
4430 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
4434 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
4436 #define SYNC_MARKS 10
4437 #define SYNC_MARK_STEP (3*HZ)
4438 static void md_do_sync(mddev_t
*mddev
)
4441 unsigned int currspeed
= 0,
4443 sector_t max_sectors
,j
, io_sectors
;
4444 unsigned long mark
[SYNC_MARKS
];
4445 sector_t mark_cnt
[SYNC_MARKS
];
4447 struct list_head
*tmp
;
4448 sector_t last_check
;
4451 /* just incase thread restarts... */
4452 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
4455 /* we overload curr_resync somewhat here.
4456 * 0 == not engaged in resync at all
4457 * 2 == checking that there is no conflict with another sync
4458 * 1 == like 2, but have yielded to allow conflicting resync to
4460 * other == active in resync - this many blocks
4462 * Before starting a resync we must have set curr_resync to
4463 * 2, and then checked that every "conflicting" array has curr_resync
4464 * less than ours. When we find one that is the same or higher
4465 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4466 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4467 * This will mean we have to start checking from the beginning again.
4472 mddev
->curr_resync
= 2;
4475 if (kthread_should_stop()) {
4476 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4479 ITERATE_MDDEV(mddev2
,tmp
) {
4480 if (mddev2
== mddev
)
4482 if (mddev2
->curr_resync
&&
4483 match_mddev_units(mddev
,mddev2
)) {
4485 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
4486 /* arbitrarily yield */
4487 mddev
->curr_resync
= 1;
4488 wake_up(&resync_wait
);
4490 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
4491 /* no need to wait here, we can wait the next
4492 * time 'round when curr_resync == 2
4495 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
4496 if (!kthread_should_stop() &&
4497 mddev2
->curr_resync
>= mddev
->curr_resync
) {
4498 printk(KERN_INFO
"md: delaying resync of %s"
4499 " until %s has finished resync (they"
4500 " share one or more physical units)\n",
4501 mdname(mddev
), mdname(mddev2
));
4504 finish_wait(&resync_wait
, &wq
);
4507 finish_wait(&resync_wait
, &wq
);
4510 } while (mddev
->curr_resync
< 2);
4512 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4513 /* resync follows the size requested by the personality,
4514 * which defaults to physical size, but can be virtual size
4516 max_sectors
= mddev
->resync_max_sectors
;
4517 mddev
->resync_mismatches
= 0;
4519 /* recovery follows the physical size of devices */
4520 max_sectors
= mddev
->size
<< 1;
4522 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
4523 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
4524 " %d KB/sec/disc.\n", speed_min(mddev
));
4525 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
4526 "(but not more than %d KB/sec) for reconstruction.\n",
4529 is_mddev_idle(mddev
); /* this also initializes IO event counters */
4530 /* we don't use the checkpoint if there's a bitmap */
4531 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
4532 && ! test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4533 j
= mddev
->recovery_cp
;
4537 for (m
= 0; m
< SYNC_MARKS
; m
++) {
4539 mark_cnt
[m
] = io_sectors
;
4542 mddev
->resync_mark
= mark
[last_mark
];
4543 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
4546 * Tune reconstruction:
4548 window
= 32*(PAGE_SIZE
/512);
4549 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
4550 window
/2,(unsigned long long) max_sectors
/2);
4552 atomic_set(&mddev
->recovery_active
, 0);
4553 init_waitqueue_head(&mddev
->recovery_wait
);
4558 "md: resuming recovery of %s from checkpoint.\n",
4560 mddev
->curr_resync
= j
;
4563 while (j
< max_sectors
) {
4567 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
4568 currspeed
< speed_min(mddev
));
4570 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4574 if (!skipped
) { /* actual IO requested */
4575 io_sectors
+= sectors
;
4576 atomic_add(sectors
, &mddev
->recovery_active
);
4580 if (j
>1) mddev
->curr_resync
= j
;
4581 if (last_check
== 0)
4582 /* this is the earliers that rebuilt will be
4583 * visible in /proc/mdstat
4585 md_new_event(mddev
);
4587 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
4590 last_check
= io_sectors
;
4592 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
4593 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
4597 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
4599 int next
= (last_mark
+1) % SYNC_MARKS
;
4601 mddev
->resync_mark
= mark
[next
];
4602 mddev
->resync_mark_cnt
= mark_cnt
[next
];
4603 mark
[next
] = jiffies
;
4604 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
4609 if (kthread_should_stop()) {
4611 * got a signal, exit.
4614 "md: md_do_sync() got signal ... exiting\n");
4615 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4620 * this loop exits only if either when we are slower than
4621 * the 'hard' speed limit, or the system was IO-idle for
4623 * the system might be non-idle CPU-wise, but we only care
4624 * about not overloading the IO subsystem. (things like an
4625 * e2fsck being done on the RAID array should execute fast)
4627 mddev
->queue
->unplug_fn(mddev
->queue
);
4630 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
4631 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
4633 if (currspeed
> speed_min(mddev
)) {
4634 if ((currspeed
> speed_max(mddev
)) ||
4635 !is_mddev_idle(mddev
)) {
4641 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
4643 * this also signals 'finished resyncing' to md_stop
4646 mddev
->queue
->unplug_fn(mddev
->queue
);
4648 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
4650 /* tell personality that we are finished */
4651 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
4653 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4654 mddev
->curr_resync
> 2 &&
4655 mddev
->curr_resync
>= mddev
->recovery_cp
) {
4656 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4658 "md: checkpointing recovery of %s.\n",
4660 mddev
->recovery_cp
= mddev
->curr_resync
;
4662 mddev
->recovery_cp
= MaxSector
;
4666 mddev
->curr_resync
= 0;
4667 wake_up(&resync_wait
);
4668 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4669 md_wakeup_thread(mddev
->thread
);
4674 * This routine is regularly called by all per-raid-array threads to
4675 * deal with generic issues like resync and super-block update.
4676 * Raid personalities that don't have a thread (linear/raid0) do not
4677 * need this as they never do any recovery or update the superblock.
4679 * It does not do any resync itself, but rather "forks" off other threads
4680 * to do that as needed.
4681 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4682 * "->recovery" and create a thread at ->sync_thread.
4683 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4684 * and wakeups up this thread which will reap the thread and finish up.
4685 * This thread also removes any faulty devices (with nr_pending == 0).
4687 * The overall approach is:
4688 * 1/ if the superblock needs updating, update it.
4689 * 2/ If a recovery thread is running, don't do anything else.
4690 * 3/ If recovery has finished, clean up, possibly marking spares active.
4691 * 4/ If there are any faulty devices, remove them.
4692 * 5/ If array is degraded, try to add spares devices
4693 * 6/ If array has spares or is not in-sync, start a resync thread.
4695 void md_check_recovery(mddev_t
*mddev
)
4698 struct list_head
*rtmp
;
4702 bitmap_daemon_work(mddev
->bitmap
);
4707 if (signal_pending(current
)) {
4708 if (mddev
->pers
->sync_request
) {
4709 printk(KERN_INFO
"md: %s in immediate safe mode\n",
4711 mddev
->safemode
= 2;
4713 flush_signals(current
);
4718 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
4719 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
4720 (mddev
->safemode
== 1) ||
4721 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
4722 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
4726 if (mddev_trylock(mddev
)==0) {
4729 spin_lock_irq(&mddev
->write_lock
);
4730 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
4731 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
4733 mddev
->sb_dirty
= 1;
4735 if (mddev
->safemode
== 1)
4736 mddev
->safemode
= 0;
4737 spin_unlock_irq(&mddev
->write_lock
);
4739 if (mddev
->sb_dirty
)
4740 md_update_sb(mddev
);
4743 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4744 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
4745 /* resync/recovery still happening */
4746 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4749 if (mddev
->sync_thread
) {
4750 /* resync has finished, collect result */
4751 md_unregister_thread(mddev
->sync_thread
);
4752 mddev
->sync_thread
= NULL
;
4753 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4754 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4756 /* activate any spares */
4757 mddev
->pers
->spare_active(mddev
);
4759 md_update_sb(mddev
);
4761 /* if array is no-longer degraded, then any saved_raid_disk
4762 * information must be scrapped
4764 if (!mddev
->degraded
)
4765 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4766 rdev
->saved_raid_disk
= -1;
4768 mddev
->recovery
= 0;
4769 /* flag recovery needed just to double check */
4770 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4771 md_new_event(mddev
);
4774 /* Clear some bits that don't mean anything, but
4777 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4778 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4779 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4780 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4782 /* no recovery is running.
4783 * remove any failed drives, then
4784 * add spares if possible.
4785 * Spare are also removed and re-added, to allow
4786 * the personality to fail the re-add.
4788 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4789 if (rdev
->raid_disk
>= 0 &&
4790 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
4791 atomic_read(&rdev
->nr_pending
)==0) {
4792 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
4794 sprintf(nm
,"rd%d", rdev
->raid_disk
);
4795 sysfs_remove_link(&mddev
->kobj
, nm
);
4796 rdev
->raid_disk
= -1;
4800 if (mddev
->degraded
) {
4801 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4802 if (rdev
->raid_disk
< 0
4803 && !test_bit(Faulty
, &rdev
->flags
)) {
4804 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
4806 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4807 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
4809 md_new_event(mddev
);
4816 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4817 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4818 } else if (mddev
->recovery_cp
< MaxSector
) {
4819 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4820 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4821 /* nothing to be done ... */
4824 if (mddev
->pers
->sync_request
) {
4825 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4826 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
4827 /* We are adding a device or devices to an array
4828 * which has the bitmap stored on all devices.
4829 * So make sure all bitmap pages get written
4831 bitmap_write_all(mddev
->bitmap
);
4833 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4836 if (!mddev
->sync_thread
) {
4837 printk(KERN_ERR
"%s: could not start resync"
4840 /* leave the spares where they are, it shouldn't hurt */
4841 mddev
->recovery
= 0;
4843 md_wakeup_thread(mddev
->sync_thread
);
4844 md_new_event(mddev
);
4847 mddev_unlock(mddev
);
4851 static int md_notify_reboot(struct notifier_block
*this,
4852 unsigned long code
, void *x
)
4854 struct list_head
*tmp
;
4857 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
4859 printk(KERN_INFO
"md: stopping all md devices.\n");
4861 ITERATE_MDDEV(mddev
,tmp
)
4862 if (mddev_trylock(mddev
)==0)
4863 do_md_stop (mddev
, 1);
4865 * certain more exotic SCSI devices are known to be
4866 * volatile wrt too early system reboots. While the
4867 * right place to handle this issue is the given
4868 * driver, we do want to have a safe RAID driver ...
4875 static struct notifier_block md_notifier
= {
4876 .notifier_call
= md_notify_reboot
,
4878 .priority
= INT_MAX
, /* before any real devices */
4881 static void md_geninit(void)
4883 struct proc_dir_entry
*p
;
4885 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
4887 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
4889 p
->proc_fops
= &md_seq_fops
;
4892 static int __init
md_init(void)
4896 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4897 " MD_SB_DISKS=%d\n",
4898 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
4899 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
4900 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
4903 if (register_blkdev(MAJOR_NR
, "md"))
4905 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
4906 unregister_blkdev(MAJOR_NR
, "md");
4910 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
4911 md_probe
, NULL
, NULL
);
4912 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
4913 md_probe
, NULL
, NULL
);
4915 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4916 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
4917 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4920 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4921 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
4922 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4926 register_reboot_notifier(&md_notifier
);
4927 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
4937 * Searches all registered partitions for autorun RAID arrays
4940 static dev_t detected_devices
[128];
4943 void md_autodetect_dev(dev_t dev
)
4945 if (dev_cnt
>= 0 && dev_cnt
< 127)
4946 detected_devices
[dev_cnt
++] = dev
;
4950 static void autostart_arrays(int part
)
4955 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
4957 for (i
= 0; i
< dev_cnt
; i
++) {
4958 dev_t dev
= detected_devices
[i
];
4960 rdev
= md_import_device(dev
,0, 0);
4964 if (test_bit(Faulty
, &rdev
->flags
)) {
4968 list_add(&rdev
->same_set
, &pending_raid_disks
);
4972 autorun_devices(part
);
4977 static __exit
void md_exit(void)
4980 struct list_head
*tmp
;
4982 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
4983 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
4984 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4985 devfs_remove("md/%d", i
);
4986 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4987 devfs_remove("md/d%d", i
);
4991 unregister_blkdev(MAJOR_NR
,"md");
4992 unregister_blkdev(mdp_major
, "mdp");
4993 unregister_reboot_notifier(&md_notifier
);
4994 unregister_sysctl_table(raid_table_header
);
4995 remove_proc_entry("mdstat", NULL
);
4996 ITERATE_MDDEV(mddev
,tmp
) {
4997 struct gendisk
*disk
= mddev
->gendisk
;
5000 export_array(mddev
);
5003 mddev
->gendisk
= NULL
;
5008 module_init(md_init
)
5009 module_exit(md_exit
)
5011 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5013 return sprintf(buffer
, "%d", start_readonly
);
5015 static int set_ro(const char *val
, struct kernel_param
*kp
)
5018 int num
= simple_strtoul(val
, &e
, 10);
5019 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5020 start_readonly
= num
;
5026 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, 0600);
5027 module_param(start_dirty_degraded
, int, 0644);
5030 EXPORT_SYMBOL(register_md_personality
);
5031 EXPORT_SYMBOL(unregister_md_personality
);
5032 EXPORT_SYMBOL(md_error
);
5033 EXPORT_SYMBOL(md_done_sync
);
5034 EXPORT_SYMBOL(md_write_start
);
5035 EXPORT_SYMBOL(md_write_end
);
5036 EXPORT_SYMBOL(md_register_thread
);
5037 EXPORT_SYMBOL(md_unregister_thread
);
5038 EXPORT_SYMBOL(md_wakeup_thread
);
5039 EXPORT_SYMBOL(md_print_devices
);
5040 EXPORT_SYMBOL(md_check_recovery
);
5041 MODULE_LICENSE("GPL");
5043 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);