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
);
1052 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1054 rdev
->size
= rdev
->sb_offset
;
1055 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1057 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1058 if (le32_to_cpu(sb
->chunksize
))
1059 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1061 if (le32_to_cpu(sb
->size
) > rdev
->size
*2)
1066 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1068 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1070 rdev
->raid_disk
= -1;
1072 if (mddev
->raid_disks
== 0) {
1073 mddev
->major_version
= 1;
1074 mddev
->patch_version
= 0;
1075 mddev
->persistent
= 1;
1076 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1077 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1078 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1079 mddev
->level
= le32_to_cpu(sb
->level
);
1080 mddev
->clevel
[0] = 0;
1081 mddev
->layout
= le32_to_cpu(sb
->layout
);
1082 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1083 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1084 mddev
->events
= le64_to_cpu(sb
->events
);
1085 mddev
->bitmap_offset
= 0;
1086 mddev
->default_bitmap_offset
= 1024 >> 9;
1088 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1089 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1091 mddev
->max_disks
= (4096-256)/2;
1093 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1094 mddev
->bitmap_file
== NULL
) {
1095 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
1096 && mddev
->level
!= 10) {
1097 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
1100 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1102 } else if (mddev
->pers
== NULL
) {
1103 /* Insist of good event counter while assembling */
1104 __u64 ev1
= le64_to_cpu(sb
->events
);
1106 if (ev1
< mddev
->events
)
1108 } else if (mddev
->bitmap
) {
1109 /* If adding to array with a bitmap, then we can accept an
1110 * older device, but not too old.
1112 __u64 ev1
= le64_to_cpu(sb
->events
);
1113 if (ev1
< mddev
->bitmap
->events_cleared
)
1115 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1118 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1120 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1121 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1123 case 0xffff: /* spare */
1125 case 0xfffe: /* faulty */
1126 set_bit(Faulty
, &rdev
->flags
);
1129 set_bit(In_sync
, &rdev
->flags
);
1130 rdev
->raid_disk
= role
;
1133 if (sb
->devflags
& WriteMostly1
)
1134 set_bit(WriteMostly
, &rdev
->flags
);
1135 } else /* MULTIPATH are always insync */
1136 set_bit(In_sync
, &rdev
->flags
);
1141 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1143 struct mdp_superblock_1
*sb
;
1144 struct list_head
*tmp
;
1147 /* make rdev->sb match mddev and rdev data. */
1149 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1151 sb
->feature_map
= 0;
1153 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1154 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1155 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1157 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1158 sb
->events
= cpu_to_le64(mddev
->events
);
1160 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1162 sb
->resync_offset
= cpu_to_le64(0);
1164 sb
->cnt_corrected_read
= atomic_read(&rdev
->corrected_errors
);
1166 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1167 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1169 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1170 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1171 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1175 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1176 if (rdev2
->desc_nr
+1 > max_dev
)
1177 max_dev
= rdev2
->desc_nr
+1;
1179 sb
->max_dev
= cpu_to_le32(max_dev
);
1180 for (i
=0; i
<max_dev
;i
++)
1181 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1183 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1185 if (test_bit(Faulty
, &rdev2
->flags
))
1186 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1187 else if (test_bit(In_sync
, &rdev2
->flags
))
1188 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1190 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1193 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1194 sb
->sb_csum
= calc_sb_1_csum(sb
);
1198 static struct super_type super_types
[] = {
1201 .owner
= THIS_MODULE
,
1202 .load_super
= super_90_load
,
1203 .validate_super
= super_90_validate
,
1204 .sync_super
= super_90_sync
,
1208 .owner
= THIS_MODULE
,
1209 .load_super
= super_1_load
,
1210 .validate_super
= super_1_validate
,
1211 .sync_super
= super_1_sync
,
1215 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1217 struct list_head
*tmp
;
1220 ITERATE_RDEV(mddev
,rdev
,tmp
)
1221 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1227 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1229 struct list_head
*tmp
;
1232 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1233 if (match_dev_unit(mddev2
, rdev
))
1239 static LIST_HEAD(pending_raid_disks
);
1241 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1243 mdk_rdev_t
*same_pdev
;
1244 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1252 /* make sure rdev->size exceeds mddev->size */
1253 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1255 /* Cannot change size, so fail */
1258 mddev
->size
= rdev
->size
;
1260 same_pdev
= match_dev_unit(mddev
, rdev
);
1263 "%s: WARNING: %s appears to be on the same physical"
1264 " disk as %s. True\n protection against single-disk"
1265 " failure might be compromised.\n",
1266 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1267 bdevname(same_pdev
->bdev
,b2
));
1269 /* Verify rdev->desc_nr is unique.
1270 * If it is -1, assign a free number, else
1271 * check number is not in use
1273 if (rdev
->desc_nr
< 0) {
1275 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1276 while (find_rdev_nr(mddev
, choice
))
1278 rdev
->desc_nr
= choice
;
1280 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1283 bdevname(rdev
->bdev
,b
);
1284 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1286 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1289 list_add(&rdev
->same_set
, &mddev
->disks
);
1290 rdev
->mddev
= mddev
;
1291 printk(KERN_INFO
"md: bind<%s>\n", b
);
1293 rdev
->kobj
.parent
= &mddev
->kobj
;
1294 kobject_add(&rdev
->kobj
);
1296 if (rdev
->bdev
->bd_part
)
1297 ko
= &rdev
->bdev
->bd_part
->kobj
;
1299 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1300 sysfs_create_link(&rdev
->kobj
, ko
, "block");
1304 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1306 char b
[BDEVNAME_SIZE
];
1311 list_del_init(&rdev
->same_set
);
1312 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1314 sysfs_remove_link(&rdev
->kobj
, "block");
1315 kobject_del(&rdev
->kobj
);
1319 * prevent the device from being mounted, repartitioned or
1320 * otherwise reused by a RAID array (or any other kernel
1321 * subsystem), by bd_claiming the device.
1323 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1326 struct block_device
*bdev
;
1327 char b
[BDEVNAME_SIZE
];
1329 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1331 printk(KERN_ERR
"md: could not open %s.\n",
1332 __bdevname(dev
, b
));
1333 return PTR_ERR(bdev
);
1335 err
= bd_claim(bdev
, rdev
);
1337 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1346 static void unlock_rdev(mdk_rdev_t
*rdev
)
1348 struct block_device
*bdev
= rdev
->bdev
;
1356 void md_autodetect_dev(dev_t dev
);
1358 static void export_rdev(mdk_rdev_t
* rdev
)
1360 char b
[BDEVNAME_SIZE
];
1361 printk(KERN_INFO
"md: export_rdev(%s)\n",
1362 bdevname(rdev
->bdev
,b
));
1366 list_del_init(&rdev
->same_set
);
1368 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1371 kobject_put(&rdev
->kobj
);
1374 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1376 unbind_rdev_from_array(rdev
);
1380 static void export_array(mddev_t
*mddev
)
1382 struct list_head
*tmp
;
1385 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1390 kick_rdev_from_array(rdev
);
1392 if (!list_empty(&mddev
->disks
))
1394 mddev
->raid_disks
= 0;
1395 mddev
->major_version
= 0;
1398 static void print_desc(mdp_disk_t
*desc
)
1400 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1401 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1404 static void print_sb(mdp_super_t
*sb
)
1409 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1410 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1411 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1413 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1414 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1415 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1416 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1417 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1418 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1419 sb
->failed_disks
, sb
->spare_disks
,
1420 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1423 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1426 desc
= sb
->disks
+ i
;
1427 if (desc
->number
|| desc
->major
|| desc
->minor
||
1428 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1429 printk(" D %2d: ", i
);
1433 printk(KERN_INFO
"md: THIS: ");
1434 print_desc(&sb
->this_disk
);
1438 static void print_rdev(mdk_rdev_t
*rdev
)
1440 char b
[BDEVNAME_SIZE
];
1441 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1442 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1443 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1445 if (rdev
->sb_loaded
) {
1446 printk(KERN_INFO
"md: rdev superblock:\n");
1447 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1449 printk(KERN_INFO
"md: no rdev superblock!\n");
1452 void md_print_devices(void)
1454 struct list_head
*tmp
, *tmp2
;
1457 char b
[BDEVNAME_SIZE
];
1460 printk("md: **********************************\n");
1461 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1462 printk("md: **********************************\n");
1463 ITERATE_MDDEV(mddev
,tmp
) {
1466 bitmap_print_sb(mddev
->bitmap
);
1468 printk("%s: ", mdname(mddev
));
1469 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1470 printk("<%s>", bdevname(rdev
->bdev
,b
));
1473 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1476 printk("md: **********************************\n");
1481 static void sync_sbs(mddev_t
* mddev
)
1484 struct list_head
*tmp
;
1486 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1487 super_types
[mddev
->major_version
].
1488 sync_super(mddev
, rdev
);
1489 rdev
->sb_loaded
= 1;
1493 static void md_update_sb(mddev_t
* mddev
)
1496 struct list_head
*tmp
;
1501 spin_lock_irq(&mddev
->write_lock
);
1502 sync_req
= mddev
->in_sync
;
1503 mddev
->utime
= get_seconds();
1506 if (!mddev
->events
) {
1508 * oops, this 64-bit counter should never wrap.
1509 * Either we are in around ~1 trillion A.C., assuming
1510 * 1 reboot per second, or we have a bug:
1515 mddev
->sb_dirty
= 2;
1519 * do not write anything to disk if using
1520 * nonpersistent superblocks
1522 if (!mddev
->persistent
) {
1523 mddev
->sb_dirty
= 0;
1524 spin_unlock_irq(&mddev
->write_lock
);
1525 wake_up(&mddev
->sb_wait
);
1528 spin_unlock_irq(&mddev
->write_lock
);
1531 "md: updating %s RAID superblock on device (in sync %d)\n",
1532 mdname(mddev
),mddev
->in_sync
);
1534 err
= bitmap_update_sb(mddev
->bitmap
);
1535 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1536 char b
[BDEVNAME_SIZE
];
1537 dprintk(KERN_INFO
"md: ");
1538 if (test_bit(Faulty
, &rdev
->flags
))
1539 dprintk("(skipping faulty ");
1541 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1542 if (!test_bit(Faulty
, &rdev
->flags
)) {
1543 md_super_write(mddev
,rdev
,
1544 rdev
->sb_offset
<<1, rdev
->sb_size
,
1546 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1547 bdevname(rdev
->bdev
,b
),
1548 (unsigned long long)rdev
->sb_offset
);
1552 if (mddev
->level
== LEVEL_MULTIPATH
)
1553 /* only need to write one superblock... */
1556 md_super_wait(mddev
);
1557 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1559 spin_lock_irq(&mddev
->write_lock
);
1560 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1561 /* have to write it out again */
1562 spin_unlock_irq(&mddev
->write_lock
);
1565 mddev
->sb_dirty
= 0;
1566 spin_unlock_irq(&mddev
->write_lock
);
1567 wake_up(&mddev
->sb_wait
);
1571 /* words written to sysfs files may, or my not, be \n terminated.
1572 * We want to accept with case. For this we use cmd_match.
1574 static int cmd_match(const char *cmd
, const char *str
)
1576 /* See if cmd, written into a sysfs file, matches
1577 * str. They must either be the same, or cmd can
1578 * have a trailing newline
1580 while (*cmd
&& *str
&& *cmd
== *str
) {
1591 struct rdev_sysfs_entry
{
1592 struct attribute attr
;
1593 ssize_t (*show
)(mdk_rdev_t
*, char *);
1594 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1598 state_show(mdk_rdev_t
*rdev
, char *page
)
1603 if (test_bit(Faulty
, &rdev
->flags
)) {
1604 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1607 if (test_bit(In_sync
, &rdev
->flags
)) {
1608 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1611 if (!test_bit(Faulty
, &rdev
->flags
) &&
1612 !test_bit(In_sync
, &rdev
->flags
)) {
1613 len
+= sprintf(page
+len
, "%sspare", sep
);
1616 return len
+sprintf(page
+len
, "\n");
1619 static struct rdev_sysfs_entry
1620 rdev_state
= __ATTR_RO(state
);
1623 super_show(mdk_rdev_t
*rdev
, char *page
)
1625 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1626 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1627 return rdev
->sb_size
;
1631 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1634 errors_show(mdk_rdev_t
*rdev
, char *page
)
1636 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1640 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1643 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1644 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1645 atomic_set(&rdev
->corrected_errors
, n
);
1650 static struct rdev_sysfs_entry rdev_errors
=
1651 __ATTR(errors
, 0644, errors_show
, errors_store
);
1654 slot_show(mdk_rdev_t
*rdev
, char *page
)
1656 if (rdev
->raid_disk
< 0)
1657 return sprintf(page
, "none\n");
1659 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1663 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1666 int slot
= simple_strtoul(buf
, &e
, 10);
1667 if (strncmp(buf
, "none", 4)==0)
1669 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1671 if (rdev
->mddev
->pers
)
1672 /* Cannot set slot in active array (yet) */
1674 if (slot
>= rdev
->mddev
->raid_disks
)
1676 rdev
->raid_disk
= slot
;
1677 /* assume it is working */
1679 set_bit(In_sync
, &rdev
->flags
);
1684 static struct rdev_sysfs_entry rdev_slot
=
1685 __ATTR(slot
, 0644, slot_show
, slot_store
);
1688 offset_show(mdk_rdev_t
*rdev
, char *page
)
1690 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1694 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1697 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1698 if (e
==buf
|| (*e
&& *e
!= '\n'))
1700 if (rdev
->mddev
->pers
)
1702 rdev
->data_offset
= offset
;
1706 static struct rdev_sysfs_entry rdev_offset
=
1707 __ATTR(offset
, 0644, offset_show
, offset_store
);
1710 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1712 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1716 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1719 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1720 if (e
==buf
|| (*e
&& *e
!= '\n'))
1722 if (rdev
->mddev
->pers
)
1725 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1726 rdev
->mddev
->size
= size
;
1730 static struct rdev_sysfs_entry rdev_size
=
1731 __ATTR(size
, 0644, rdev_size_show
, rdev_size_store
);
1733 static struct attribute
*rdev_default_attrs
[] = {
1743 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1745 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1746 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1750 return entry
->show(rdev
, page
);
1754 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1755 const char *page
, size_t length
)
1757 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1758 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1762 return entry
->store(rdev
, page
, length
);
1765 static void rdev_free(struct kobject
*ko
)
1767 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1770 static struct sysfs_ops rdev_sysfs_ops
= {
1771 .show
= rdev_attr_show
,
1772 .store
= rdev_attr_store
,
1774 static struct kobj_type rdev_ktype
= {
1775 .release
= rdev_free
,
1776 .sysfs_ops
= &rdev_sysfs_ops
,
1777 .default_attrs
= rdev_default_attrs
,
1781 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1783 * mark the device faulty if:
1785 * - the device is nonexistent (zero size)
1786 * - the device has no valid superblock
1788 * a faulty rdev _never_ has rdev->sb set.
1790 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1792 char b
[BDEVNAME_SIZE
];
1797 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
1799 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1800 return ERR_PTR(-ENOMEM
);
1803 if ((err
= alloc_disk_sb(rdev
)))
1806 err
= lock_rdev(rdev
, newdev
);
1810 rdev
->kobj
.parent
= NULL
;
1811 rdev
->kobj
.ktype
= &rdev_ktype
;
1812 kobject_init(&rdev
->kobj
);
1815 rdev
->saved_raid_disk
= -1;
1817 rdev
->data_offset
= 0;
1818 atomic_set(&rdev
->nr_pending
, 0);
1819 atomic_set(&rdev
->read_errors
, 0);
1820 atomic_set(&rdev
->corrected_errors
, 0);
1822 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1825 "md: %s has zero or unknown size, marking faulty!\n",
1826 bdevname(rdev
->bdev
,b
));
1831 if (super_format
>= 0) {
1832 err
= super_types
[super_format
].
1833 load_super(rdev
, NULL
, super_minor
);
1834 if (err
== -EINVAL
) {
1836 "md: %s has invalid sb, not importing!\n",
1837 bdevname(rdev
->bdev
,b
));
1842 "md: could not read %s's sb, not importing!\n",
1843 bdevname(rdev
->bdev
,b
));
1847 INIT_LIST_HEAD(&rdev
->same_set
);
1852 if (rdev
->sb_page
) {
1858 return ERR_PTR(err
);
1862 * Check a full RAID array for plausibility
1866 static void analyze_sbs(mddev_t
* mddev
)
1869 struct list_head
*tmp
;
1870 mdk_rdev_t
*rdev
, *freshest
;
1871 char b
[BDEVNAME_SIZE
];
1874 ITERATE_RDEV(mddev
,rdev
,tmp
)
1875 switch (super_types
[mddev
->major_version
].
1876 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1884 "md: fatal superblock inconsistency in %s"
1885 " -- removing from array\n",
1886 bdevname(rdev
->bdev
,b
));
1887 kick_rdev_from_array(rdev
);
1891 super_types
[mddev
->major_version
].
1892 validate_super(mddev
, freshest
);
1895 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1896 if (rdev
!= freshest
)
1897 if (super_types
[mddev
->major_version
].
1898 validate_super(mddev
, rdev
)) {
1899 printk(KERN_WARNING
"md: kicking non-fresh %s"
1901 bdevname(rdev
->bdev
,b
));
1902 kick_rdev_from_array(rdev
);
1905 if (mddev
->level
== LEVEL_MULTIPATH
) {
1906 rdev
->desc_nr
= i
++;
1907 rdev
->raid_disk
= rdev
->desc_nr
;
1908 set_bit(In_sync
, &rdev
->flags
);
1914 if (mddev
->recovery_cp
!= MaxSector
&&
1916 printk(KERN_ERR
"md: %s: raid array is not clean"
1917 " -- starting background reconstruction\n",
1923 level_show(mddev_t
*mddev
, char *page
)
1925 struct mdk_personality
*p
= mddev
->pers
;
1927 return sprintf(page
, "%s\n", p
->name
);
1928 else if (mddev
->clevel
[0])
1929 return sprintf(page
, "%s\n", mddev
->clevel
);
1930 else if (mddev
->level
!= LEVEL_NONE
)
1931 return sprintf(page
, "%d\n", mddev
->level
);
1937 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1944 if (len
>= sizeof(mddev
->clevel
))
1946 strncpy(mddev
->clevel
, buf
, len
);
1947 if (mddev
->clevel
[len
-1] == '\n')
1949 mddev
->clevel
[len
] = 0;
1950 mddev
->level
= LEVEL_NONE
;
1954 static struct md_sysfs_entry md_level
=
1955 __ATTR(level
, 0644, level_show
, level_store
);
1958 raid_disks_show(mddev_t
*mddev
, char *page
)
1960 if (mddev
->raid_disks
== 0)
1962 return sprintf(page
, "%d\n", mddev
->raid_disks
);
1965 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
1968 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1970 /* can only set raid_disks if array is not yet active */
1973 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1975 if (!*buf
|| (*e
&& *e
!= '\n'))
1979 rv
= update_raid_disks(mddev
, n
);
1981 mddev
->raid_disks
= n
;
1982 return rv
? rv
: len
;
1984 static struct md_sysfs_entry md_raid_disks
=
1985 __ATTR(raid_disks
, 0644, raid_disks_show
, raid_disks_store
);
1988 chunk_size_show(mddev_t
*mddev
, char *page
)
1990 return sprintf(page
, "%d\n", mddev
->chunk_size
);
1994 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1996 /* can only set chunk_size if array is not yet active */
1998 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2002 if (!*buf
|| (*e
&& *e
!= '\n'))
2005 mddev
->chunk_size
= n
;
2008 static struct md_sysfs_entry md_chunk_size
=
2009 __ATTR(chunk_size
, 0644, chunk_size_show
, chunk_size_store
);
2012 null_show(mddev_t
*mddev
, char *page
)
2018 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2020 /* buf must be %d:%d\n? giving major and minor numbers */
2021 /* The new device is added to the array.
2022 * If the array has a persistent superblock, we read the
2023 * superblock to initialise info and check validity.
2024 * Otherwise, only checking done is that in bind_rdev_to_array,
2025 * which mainly checks size.
2028 int major
= simple_strtoul(buf
, &e
, 10);
2034 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2036 minor
= simple_strtoul(e
+1, &e
, 10);
2037 if (*e
&& *e
!= '\n')
2039 dev
= MKDEV(major
, minor
);
2040 if (major
!= MAJOR(dev
) ||
2041 minor
!= MINOR(dev
))
2045 if (mddev
->persistent
) {
2046 rdev
= md_import_device(dev
, mddev
->major_version
,
2047 mddev
->minor_version
);
2048 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2049 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2050 mdk_rdev_t
, same_set
);
2051 err
= super_types
[mddev
->major_version
]
2052 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2057 rdev
= md_import_device(dev
, -1, -1);
2060 return PTR_ERR(rdev
);
2061 err
= bind_rdev_to_array(rdev
, mddev
);
2065 return err
? err
: len
;
2068 static struct md_sysfs_entry md_new_device
=
2069 __ATTR(new_dev
, 0200, null_show
, new_dev_store
);
2072 size_show(mddev_t
*mddev
, char *page
)
2074 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2077 static int update_size(mddev_t
*mddev
, unsigned long size
);
2080 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2082 /* If array is inactive, we can reduce the component size, but
2083 * not increase it (except from 0).
2084 * If array is active, we can try an on-line resize
2088 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2089 if (!*buf
|| *buf
== '\n' ||
2094 err
= update_size(mddev
, size
);
2095 md_update_sb(mddev
);
2097 if (mddev
->size
== 0 ||
2103 return err
? err
: len
;
2106 static struct md_sysfs_entry md_size
=
2107 __ATTR(component_size
, 0644, size_show
, size_store
);
2111 * This is either 'none' for arrays with externally managed metadata,
2112 * or N.M for internally known formats
2115 metadata_show(mddev_t
*mddev
, char *page
)
2117 if (mddev
->persistent
)
2118 return sprintf(page
, "%d.%d\n",
2119 mddev
->major_version
, mddev
->minor_version
);
2121 return sprintf(page
, "none\n");
2125 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2129 if (!list_empty(&mddev
->disks
))
2132 if (cmd_match(buf
, "none")) {
2133 mddev
->persistent
= 0;
2134 mddev
->major_version
= 0;
2135 mddev
->minor_version
= 90;
2138 major
= simple_strtoul(buf
, &e
, 10);
2139 if (e
==buf
|| *e
!= '.')
2142 minor
= simple_strtoul(buf
, &e
, 10);
2143 if (e
==buf
|| *e
!= '\n')
2145 if (major
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2146 super_types
[major
].name
== NULL
)
2148 mddev
->major_version
= major
;
2149 mddev
->minor_version
= minor
;
2150 mddev
->persistent
= 1;
2154 static struct md_sysfs_entry md_metadata
=
2155 __ATTR(metadata_version
, 0644, metadata_show
, metadata_store
);
2158 action_show(mddev_t
*mddev
, char *page
)
2160 char *type
= "idle";
2161 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2162 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2163 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2164 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2166 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2173 return sprintf(page
, "%s\n", type
);
2177 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2179 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2182 if (cmd_match(page
, "idle")) {
2183 if (mddev
->sync_thread
) {
2184 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2185 md_unregister_thread(mddev
->sync_thread
);
2186 mddev
->sync_thread
= NULL
;
2187 mddev
->recovery
= 0;
2189 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2190 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2192 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2193 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2195 if (cmd_match(page
, "check"))
2196 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2197 else if (!cmd_match(page
, "repair"))
2199 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2200 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2202 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2203 md_wakeup_thread(mddev
->thread
);
2208 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2210 return sprintf(page
, "%llu\n",
2211 (unsigned long long) mddev
->resync_mismatches
);
2214 static struct md_sysfs_entry
2215 md_scan_mode
= __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2218 static struct md_sysfs_entry
2219 md_mismatches
= __ATTR_RO(mismatch_cnt
);
2222 sync_min_show(mddev_t
*mddev
, char *page
)
2224 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2225 mddev
->sync_speed_min
? "local": "system");
2229 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2233 if (strncmp(buf
, "system", 6)==0) {
2234 mddev
->sync_speed_min
= 0;
2237 min
= simple_strtoul(buf
, &e
, 10);
2238 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2240 mddev
->sync_speed_min
= min
;
2244 static struct md_sysfs_entry md_sync_min
=
2245 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2248 sync_max_show(mddev_t
*mddev
, char *page
)
2250 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2251 mddev
->sync_speed_max
? "local": "system");
2255 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2259 if (strncmp(buf
, "system", 6)==0) {
2260 mddev
->sync_speed_max
= 0;
2263 max
= simple_strtoul(buf
, &e
, 10);
2264 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2266 mddev
->sync_speed_max
= max
;
2270 static struct md_sysfs_entry md_sync_max
=
2271 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2275 sync_speed_show(mddev_t
*mddev
, char *page
)
2277 unsigned long resync
, dt
, db
;
2278 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2279 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2281 db
= resync
- (mddev
->resync_mark_cnt
);
2282 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2285 static struct md_sysfs_entry
2286 md_sync_speed
= __ATTR_RO(sync_speed
);
2289 sync_completed_show(mddev_t
*mddev
, char *page
)
2291 unsigned long max_blocks
, resync
;
2293 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2294 max_blocks
= mddev
->resync_max_sectors
;
2296 max_blocks
= mddev
->size
<< 1;
2298 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2299 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2302 static struct md_sysfs_entry
2303 md_sync_completed
= __ATTR_RO(sync_completed
);
2305 static struct attribute
*md_default_attrs
[] = {
2307 &md_raid_disks
.attr
,
2308 &md_chunk_size
.attr
,
2311 &md_new_device
.attr
,
2315 static struct attribute
*md_redundancy_attrs
[] = {
2317 &md_mismatches
.attr
,
2320 &md_sync_speed
.attr
,
2321 &md_sync_completed
.attr
,
2324 static struct attribute_group md_redundancy_group
= {
2326 .attrs
= md_redundancy_attrs
,
2331 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2333 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2334 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2340 rv
= entry
->show(mddev
, page
);
2341 mddev_unlock(mddev
);
2346 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2347 const char *page
, size_t length
)
2349 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2350 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2356 rv
= entry
->store(mddev
, page
, length
);
2357 mddev_unlock(mddev
);
2361 static void md_free(struct kobject
*ko
)
2363 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
2367 static struct sysfs_ops md_sysfs_ops
= {
2368 .show
= md_attr_show
,
2369 .store
= md_attr_store
,
2371 static struct kobj_type md_ktype
= {
2373 .sysfs_ops
= &md_sysfs_ops
,
2374 .default_attrs
= md_default_attrs
,
2379 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
2381 static DECLARE_MUTEX(disks_sem
);
2382 mddev_t
*mddev
= mddev_find(dev
);
2383 struct gendisk
*disk
;
2384 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
2385 int shift
= partitioned
? MdpMinorShift
: 0;
2386 int unit
= MINOR(dev
) >> shift
;
2392 if (mddev
->gendisk
) {
2397 disk
= alloc_disk(1 << shift
);
2403 disk
->major
= MAJOR(dev
);
2404 disk
->first_minor
= unit
<< shift
;
2406 sprintf(disk
->disk_name
, "md_d%d", unit
);
2407 sprintf(disk
->devfs_name
, "md/d%d", unit
);
2409 sprintf(disk
->disk_name
, "md%d", unit
);
2410 sprintf(disk
->devfs_name
, "md/%d", unit
);
2412 disk
->fops
= &md_fops
;
2413 disk
->private_data
= mddev
;
2414 disk
->queue
= mddev
->queue
;
2416 mddev
->gendisk
= disk
;
2418 mddev
->kobj
.parent
= &disk
->kobj
;
2419 mddev
->kobj
.k_name
= NULL
;
2420 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
2421 mddev
->kobj
.ktype
= &md_ktype
;
2422 kobject_register(&mddev
->kobj
);
2426 void md_wakeup_thread(mdk_thread_t
*thread
);
2428 static void md_safemode_timeout(unsigned long data
)
2430 mddev_t
*mddev
= (mddev_t
*) data
;
2432 mddev
->safemode
= 1;
2433 md_wakeup_thread(mddev
->thread
);
2436 static int start_dirty_degraded
;
2438 static int do_md_run(mddev_t
* mddev
)
2442 struct list_head
*tmp
;
2444 struct gendisk
*disk
;
2445 struct mdk_personality
*pers
;
2446 char b
[BDEVNAME_SIZE
];
2448 if (list_empty(&mddev
->disks
))
2449 /* cannot run an array with no devices.. */
2456 * Analyze all RAID superblock(s)
2458 if (!mddev
->raid_disks
)
2461 chunk_size
= mddev
->chunk_size
;
2464 if (chunk_size
> MAX_CHUNK_SIZE
) {
2465 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
2466 chunk_size
, MAX_CHUNK_SIZE
);
2470 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2472 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
2473 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
2476 if (chunk_size
< PAGE_SIZE
) {
2477 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
2478 chunk_size
, PAGE_SIZE
);
2482 /* devices must have minimum size of one chunk */
2483 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2484 if (test_bit(Faulty
, &rdev
->flags
))
2486 if (rdev
->size
< chunk_size
/ 1024) {
2488 "md: Dev %s smaller than chunk_size:"
2490 bdevname(rdev
->bdev
,b
),
2491 (unsigned long long)rdev
->size
,
2499 if (mddev
->level
!= LEVEL_NONE
)
2500 request_module("md-level-%d", mddev
->level
);
2501 else if (mddev
->clevel
[0])
2502 request_module("md-%s", mddev
->clevel
);
2506 * Drop all container device buffers, from now on
2507 * the only valid external interface is through the md
2509 * Also find largest hardsector size
2511 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2512 if (test_bit(Faulty
, &rdev
->flags
))
2514 sync_blockdev(rdev
->bdev
);
2515 invalidate_bdev(rdev
->bdev
, 0);
2518 md_probe(mddev
->unit
, NULL
, NULL
);
2519 disk
= mddev
->gendisk
;
2523 spin_lock(&pers_lock
);
2524 pers
= find_pers(mddev
->level
, mddev
->clevel
);
2525 if (!pers
|| !try_module_get(pers
->owner
)) {
2526 spin_unlock(&pers_lock
);
2527 if (mddev
->level
!= LEVEL_NONE
)
2528 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
2531 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
2536 spin_unlock(&pers_lock
);
2537 mddev
->level
= pers
->level
;
2538 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2540 mddev
->recovery
= 0;
2541 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
2542 mddev
->barriers_work
= 1;
2543 mddev
->ok_start_degraded
= start_dirty_degraded
;
2546 mddev
->ro
= 2; /* read-only, but switch on first write */
2548 err
= mddev
->pers
->run(mddev
);
2549 if (!err
&& mddev
->pers
->sync_request
) {
2550 err
= bitmap_create(mddev
);
2552 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
2553 mdname(mddev
), err
);
2554 mddev
->pers
->stop(mddev
);
2558 printk(KERN_ERR
"md: pers->run() failed ...\n");
2559 module_put(mddev
->pers
->owner
);
2561 bitmap_destroy(mddev
);
2564 if (mddev
->pers
->sync_request
)
2565 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
);
2566 else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
2569 atomic_set(&mddev
->writes_pending
,0);
2570 mddev
->safemode
= 0;
2571 mddev
->safemode_timer
.function
= md_safemode_timeout
;
2572 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
2573 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
2576 ITERATE_RDEV(mddev
,rdev
,tmp
)
2577 if (rdev
->raid_disk
>= 0) {
2579 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2580 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
2583 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2584 md_wakeup_thread(mddev
->thread
);
2586 if (mddev
->sb_dirty
)
2587 md_update_sb(mddev
);
2589 set_capacity(disk
, mddev
->array_size
<<1);
2591 /* If we call blk_queue_make_request here, it will
2592 * re-initialise max_sectors etc which may have been
2593 * refined inside -> run. So just set the bits we need to set.
2594 * Most initialisation happended when we called
2595 * blk_queue_make_request(..., md_fail_request)
2598 mddev
->queue
->queuedata
= mddev
;
2599 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
2602 md_new_event(mddev
);
2606 static int restart_array(mddev_t
*mddev
)
2608 struct gendisk
*disk
= mddev
->gendisk
;
2612 * Complain if it has no devices
2615 if (list_empty(&mddev
->disks
))
2623 mddev
->safemode
= 0;
2625 set_disk_ro(disk
, 0);
2627 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
2630 * Kick recovery or resync if necessary
2632 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2633 md_wakeup_thread(mddev
->thread
);
2636 printk(KERN_ERR
"md: %s has no personality assigned.\n",
2645 static int do_md_stop(mddev_t
* mddev
, int ro
)
2648 struct gendisk
*disk
= mddev
->gendisk
;
2651 if (atomic_read(&mddev
->active
)>2) {
2652 printk("md: %s still in use.\n",mdname(mddev
));
2656 if (mddev
->sync_thread
) {
2657 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2658 md_unregister_thread(mddev
->sync_thread
);
2659 mddev
->sync_thread
= NULL
;
2662 del_timer_sync(&mddev
->safemode_timer
);
2664 invalidate_partition(disk
, 0);
2672 bitmap_flush(mddev
);
2673 md_super_wait(mddev
);
2675 set_disk_ro(disk
, 0);
2676 blk_queue_make_request(mddev
->queue
, md_fail_request
);
2677 mddev
->pers
->stop(mddev
);
2678 if (mddev
->pers
->sync_request
)
2679 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
2681 module_put(mddev
->pers
->owner
);
2686 if (!mddev
->in_sync
) {
2687 /* mark array as shutdown cleanly */
2689 md_update_sb(mddev
);
2692 set_disk_ro(disk
, 1);
2696 * Free resources if final stop
2700 struct list_head
*tmp
;
2701 struct gendisk
*disk
;
2702 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
2704 bitmap_destroy(mddev
);
2705 if (mddev
->bitmap_file
) {
2706 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
2707 fput(mddev
->bitmap_file
);
2708 mddev
->bitmap_file
= NULL
;
2710 mddev
->bitmap_offset
= 0;
2712 ITERATE_RDEV(mddev
,rdev
,tmp
)
2713 if (rdev
->raid_disk
>= 0) {
2715 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2716 sysfs_remove_link(&mddev
->kobj
, nm
);
2719 export_array(mddev
);
2721 mddev
->array_size
= 0;
2722 disk
= mddev
->gendisk
;
2724 set_capacity(disk
, 0);
2727 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
2730 md_new_event(mddev
);
2735 static void autorun_array(mddev_t
*mddev
)
2738 struct list_head
*tmp
;
2741 if (list_empty(&mddev
->disks
))
2744 printk(KERN_INFO
"md: running: ");
2746 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2747 char b
[BDEVNAME_SIZE
];
2748 printk("<%s>", bdevname(rdev
->bdev
,b
));
2752 err
= do_md_run (mddev
);
2754 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
2755 do_md_stop (mddev
, 0);
2760 * lets try to run arrays based on all disks that have arrived
2761 * until now. (those are in pending_raid_disks)
2763 * the method: pick the first pending disk, collect all disks with
2764 * the same UUID, remove all from the pending list and put them into
2765 * the 'same_array' list. Then order this list based on superblock
2766 * update time (freshest comes first), kick out 'old' disks and
2767 * compare superblocks. If everything's fine then run it.
2769 * If "unit" is allocated, then bump its reference count
2771 static void autorun_devices(int part
)
2773 struct list_head candidates
;
2774 struct list_head
*tmp
;
2775 mdk_rdev_t
*rdev0
, *rdev
;
2777 char b
[BDEVNAME_SIZE
];
2779 printk(KERN_INFO
"md: autorun ...\n");
2780 while (!list_empty(&pending_raid_disks
)) {
2782 rdev0
= list_entry(pending_raid_disks
.next
,
2783 mdk_rdev_t
, same_set
);
2785 printk(KERN_INFO
"md: considering %s ...\n",
2786 bdevname(rdev0
->bdev
,b
));
2787 INIT_LIST_HEAD(&candidates
);
2788 ITERATE_RDEV_PENDING(rdev
,tmp
)
2789 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
2790 printk(KERN_INFO
"md: adding %s ...\n",
2791 bdevname(rdev
->bdev
,b
));
2792 list_move(&rdev
->same_set
, &candidates
);
2795 * now we have a set of devices, with all of them having
2796 * mostly sane superblocks. It's time to allocate the
2799 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
2800 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
2801 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
2805 dev
= MKDEV(mdp_major
,
2806 rdev0
->preferred_minor
<< MdpMinorShift
);
2808 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
2810 md_probe(dev
, NULL
, NULL
);
2811 mddev
= mddev_find(dev
);
2814 "md: cannot allocate memory for md drive.\n");
2817 if (mddev_lock(mddev
))
2818 printk(KERN_WARNING
"md: %s locked, cannot run\n",
2820 else if (mddev
->raid_disks
|| mddev
->major_version
2821 || !list_empty(&mddev
->disks
)) {
2823 "md: %s already running, cannot run %s\n",
2824 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
2825 mddev_unlock(mddev
);
2827 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
2828 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
2829 list_del_init(&rdev
->same_set
);
2830 if (bind_rdev_to_array(rdev
, mddev
))
2833 autorun_array(mddev
);
2834 mddev_unlock(mddev
);
2836 /* on success, candidates will be empty, on error
2839 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
2843 printk(KERN_INFO
"md: ... autorun DONE.\n");
2847 * import RAID devices based on one partition
2848 * if possible, the array gets run as well.
2851 static int autostart_array(dev_t startdev
)
2853 char b
[BDEVNAME_SIZE
];
2854 int err
= -EINVAL
, i
;
2855 mdp_super_t
*sb
= NULL
;
2856 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
2858 start_rdev
= md_import_device(startdev
, 0, 0);
2859 if (IS_ERR(start_rdev
))
2863 /* NOTE: this can only work for 0.90.0 superblocks */
2864 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
2865 if (sb
->major_version
!= 0 ||
2866 sb
->minor_version
!= 90 ) {
2867 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
2868 export_rdev(start_rdev
);
2872 if (test_bit(Faulty
, &start_rdev
->flags
)) {
2874 "md: can not autostart based on faulty %s!\n",
2875 bdevname(start_rdev
->bdev
,b
));
2876 export_rdev(start_rdev
);
2879 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
2881 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2882 mdp_disk_t
*desc
= sb
->disks
+ i
;
2883 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
2887 if (dev
== startdev
)
2889 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
2891 rdev
= md_import_device(dev
, 0, 0);
2895 list_add(&rdev
->same_set
, &pending_raid_disks
);
2899 * possibly return codes
2907 static int get_version(void __user
* arg
)
2911 ver
.major
= MD_MAJOR_VERSION
;
2912 ver
.minor
= MD_MINOR_VERSION
;
2913 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
2915 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
2921 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
2923 mdu_array_info_t info
;
2924 int nr
,working
,active
,failed
,spare
;
2926 struct list_head
*tmp
;
2928 nr
=working
=active
=failed
=spare
=0;
2929 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2931 if (test_bit(Faulty
, &rdev
->flags
))
2935 if (test_bit(In_sync
, &rdev
->flags
))
2942 info
.major_version
= mddev
->major_version
;
2943 info
.minor_version
= mddev
->minor_version
;
2944 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
2945 info
.ctime
= mddev
->ctime
;
2946 info
.level
= mddev
->level
;
2947 info
.size
= mddev
->size
;
2948 if (info
.size
!= mddev
->size
) /* overflow */
2951 info
.raid_disks
= mddev
->raid_disks
;
2952 info
.md_minor
= mddev
->md_minor
;
2953 info
.not_persistent
= !mddev
->persistent
;
2955 info
.utime
= mddev
->utime
;
2958 info
.state
= (1<<MD_SB_CLEAN
);
2959 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2960 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
2961 info
.active_disks
= active
;
2962 info
.working_disks
= working
;
2963 info
.failed_disks
= failed
;
2964 info
.spare_disks
= spare
;
2966 info
.layout
= mddev
->layout
;
2967 info
.chunk_size
= mddev
->chunk_size
;
2969 if (copy_to_user(arg
, &info
, sizeof(info
)))
2975 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
2977 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
2978 char *ptr
, *buf
= NULL
;
2981 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
2985 /* bitmap disabled, zero the first byte and copy out */
2986 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
2987 file
->pathname
[0] = '\0';
2991 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
2995 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
2999 strcpy(file
->pathname
, ptr
);
3003 if (copy_to_user(arg
, file
, sizeof(*file
)))
3011 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3013 mdu_disk_info_t info
;
3017 if (copy_from_user(&info
, arg
, sizeof(info
)))
3022 rdev
= find_rdev_nr(mddev
, nr
);
3024 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3025 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3026 info
.raid_disk
= rdev
->raid_disk
;
3028 if (test_bit(Faulty
, &rdev
->flags
))
3029 info
.state
|= (1<<MD_DISK_FAULTY
);
3030 else if (test_bit(In_sync
, &rdev
->flags
)) {
3031 info
.state
|= (1<<MD_DISK_ACTIVE
);
3032 info
.state
|= (1<<MD_DISK_SYNC
);
3034 if (test_bit(WriteMostly
, &rdev
->flags
))
3035 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3037 info
.major
= info
.minor
= 0;
3038 info
.raid_disk
= -1;
3039 info
.state
= (1<<MD_DISK_REMOVED
);
3042 if (copy_to_user(arg
, &info
, sizeof(info
)))
3048 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3050 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3052 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3054 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3057 if (!mddev
->raid_disks
) {
3059 /* expecting a device which has a superblock */
3060 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3063 "md: md_import_device returned %ld\n",
3065 return PTR_ERR(rdev
);
3067 if (!list_empty(&mddev
->disks
)) {
3068 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3069 mdk_rdev_t
, same_set
);
3070 int err
= super_types
[mddev
->major_version
]
3071 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3074 "md: %s has different UUID to %s\n",
3075 bdevname(rdev
->bdev
,b
),
3076 bdevname(rdev0
->bdev
,b2
));
3081 err
= bind_rdev_to_array(rdev
, mddev
);
3088 * add_new_disk can be used once the array is assembled
3089 * to add "hot spares". They must already have a superblock
3094 if (!mddev
->pers
->hot_add_disk
) {
3096 "%s: personality does not support diskops!\n",
3100 if (mddev
->persistent
)
3101 rdev
= md_import_device(dev
, mddev
->major_version
,
3102 mddev
->minor_version
);
3104 rdev
= md_import_device(dev
, -1, -1);
3107 "md: md_import_device returned %ld\n",
3109 return PTR_ERR(rdev
);
3111 /* set save_raid_disk if appropriate */
3112 if (!mddev
->persistent
) {
3113 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3114 info
->raid_disk
< mddev
->raid_disks
)
3115 rdev
->raid_disk
= info
->raid_disk
;
3117 rdev
->raid_disk
= -1;
3119 super_types
[mddev
->major_version
].
3120 validate_super(mddev
, rdev
);
3121 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3123 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3124 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3125 set_bit(WriteMostly
, &rdev
->flags
);
3127 rdev
->raid_disk
= -1;
3128 err
= bind_rdev_to_array(rdev
, mddev
);
3132 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3133 md_wakeup_thread(mddev
->thread
);
3137 /* otherwise, add_new_disk is only allowed
3138 * for major_version==0 superblocks
3140 if (mddev
->major_version
!= 0) {
3141 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3146 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3148 rdev
= md_import_device (dev
, -1, 0);
3151 "md: error, md_import_device() returned %ld\n",
3153 return PTR_ERR(rdev
);
3155 rdev
->desc_nr
= info
->number
;
3156 if (info
->raid_disk
< mddev
->raid_disks
)
3157 rdev
->raid_disk
= info
->raid_disk
;
3159 rdev
->raid_disk
= -1;
3163 if (rdev
->raid_disk
< mddev
->raid_disks
)
3164 if (info
->state
& (1<<MD_DISK_SYNC
))
3165 set_bit(In_sync
, &rdev
->flags
);
3167 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3168 set_bit(WriteMostly
, &rdev
->flags
);
3170 if (!mddev
->persistent
) {
3171 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3172 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3174 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3175 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3177 err
= bind_rdev_to_array(rdev
, mddev
);
3187 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3189 char b
[BDEVNAME_SIZE
];
3195 rdev
= find_rdev(mddev
, dev
);
3199 if (rdev
->raid_disk
>= 0)
3202 kick_rdev_from_array(rdev
);
3203 md_update_sb(mddev
);
3204 md_new_event(mddev
);
3208 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3209 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3213 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3215 char b
[BDEVNAME_SIZE
];
3223 if (mddev
->major_version
!= 0) {
3224 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3225 " version-0 superblocks.\n",
3229 if (!mddev
->pers
->hot_add_disk
) {
3231 "%s: personality does not support diskops!\n",
3236 rdev
= md_import_device (dev
, -1, 0);
3239 "md: error, md_import_device() returned %ld\n",
3244 if (mddev
->persistent
)
3245 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3248 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3250 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3253 if (test_bit(Faulty
, &rdev
->flags
)) {
3255 "md: can not hot-add faulty %s disk to %s!\n",
3256 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3260 clear_bit(In_sync
, &rdev
->flags
);
3262 rdev
->saved_raid_disk
= -1;
3263 err
= bind_rdev_to_array(rdev
, mddev
);
3268 * The rest should better be atomic, we can have disk failures
3269 * noticed in interrupt contexts ...
3272 if (rdev
->desc_nr
== mddev
->max_disks
) {
3273 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
3276 goto abort_unbind_export
;
3279 rdev
->raid_disk
= -1;
3281 md_update_sb(mddev
);
3284 * Kick recovery, maybe this spare has to be added to the
3285 * array immediately.
3287 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3288 md_wakeup_thread(mddev
->thread
);
3289 md_new_event(mddev
);
3292 abort_unbind_export
:
3293 unbind_rdev_from_array(rdev
);
3300 /* similar to deny_write_access, but accounts for our holding a reference
3301 * to the file ourselves */
3302 static int deny_bitmap_write_access(struct file
* file
)
3304 struct inode
*inode
= file
->f_mapping
->host
;
3306 spin_lock(&inode
->i_lock
);
3307 if (atomic_read(&inode
->i_writecount
) > 1) {
3308 spin_unlock(&inode
->i_lock
);
3311 atomic_set(&inode
->i_writecount
, -1);
3312 spin_unlock(&inode
->i_lock
);
3317 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
3322 if (!mddev
->pers
->quiesce
)
3324 if (mddev
->recovery
|| mddev
->sync_thread
)
3326 /* we should be able to change the bitmap.. */
3332 return -EEXIST
; /* cannot add when bitmap is present */
3333 mddev
->bitmap_file
= fget(fd
);
3335 if (mddev
->bitmap_file
== NULL
) {
3336 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
3341 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
3343 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
3345 fput(mddev
->bitmap_file
);
3346 mddev
->bitmap_file
= NULL
;
3349 mddev
->bitmap_offset
= 0; /* file overrides offset */
3350 } else if (mddev
->bitmap
== NULL
)
3351 return -ENOENT
; /* cannot remove what isn't there */
3354 mddev
->pers
->quiesce(mddev
, 1);
3356 err
= bitmap_create(mddev
);
3358 bitmap_destroy(mddev
);
3359 mddev
->pers
->quiesce(mddev
, 0);
3360 } else if (fd
< 0) {
3361 if (mddev
->bitmap_file
)
3362 fput(mddev
->bitmap_file
);
3363 mddev
->bitmap_file
= NULL
;
3370 * set_array_info is used two different ways
3371 * The original usage is when creating a new array.
3372 * In this usage, raid_disks is > 0 and it together with
3373 * level, size, not_persistent,layout,chunksize determine the
3374 * shape of the array.
3375 * This will always create an array with a type-0.90.0 superblock.
3376 * The newer usage is when assembling an array.
3377 * In this case raid_disks will be 0, and the major_version field is
3378 * use to determine which style super-blocks are to be found on the devices.
3379 * The minor and patch _version numbers are also kept incase the
3380 * super_block handler wishes to interpret them.
3382 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
3385 if (info
->raid_disks
== 0) {
3386 /* just setting version number for superblock loading */
3387 if (info
->major_version
< 0 ||
3388 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
3389 super_types
[info
->major_version
].name
== NULL
) {
3390 /* maybe try to auto-load a module? */
3392 "md: superblock version %d not known\n",
3393 info
->major_version
);
3396 mddev
->major_version
= info
->major_version
;
3397 mddev
->minor_version
= info
->minor_version
;
3398 mddev
->patch_version
= info
->patch_version
;
3401 mddev
->major_version
= MD_MAJOR_VERSION
;
3402 mddev
->minor_version
= MD_MINOR_VERSION
;
3403 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
3404 mddev
->ctime
= get_seconds();
3406 mddev
->level
= info
->level
;
3407 mddev
->clevel
[0] = 0;
3408 mddev
->size
= info
->size
;
3409 mddev
->raid_disks
= info
->raid_disks
;
3410 /* don't set md_minor, it is determined by which /dev/md* was
3413 if (info
->state
& (1<<MD_SB_CLEAN
))
3414 mddev
->recovery_cp
= MaxSector
;
3416 mddev
->recovery_cp
= 0;
3417 mddev
->persistent
= ! info
->not_persistent
;
3419 mddev
->layout
= info
->layout
;
3420 mddev
->chunk_size
= info
->chunk_size
;
3422 mddev
->max_disks
= MD_SB_DISKS
;
3424 mddev
->sb_dirty
= 1;
3426 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
3427 mddev
->bitmap_offset
= 0;
3430 * Generate a 128 bit UUID
3432 get_random_bytes(mddev
->uuid
, 16);
3437 static int update_size(mddev_t
*mddev
, unsigned long size
)
3441 struct list_head
*tmp
;
3442 int fit
= (size
== 0);
3444 if (mddev
->pers
->resize
== NULL
)
3446 /* The "size" is the amount of each device that is used.
3447 * This can only make sense for arrays with redundancy.
3448 * linear and raid0 always use whatever space is available
3449 * We can only consider changing the size if no resync
3450 * or reconstruction is happening, and if the new size
3451 * is acceptable. It must fit before the sb_offset or,
3452 * if that is <data_offset, it must fit before the
3453 * size of each device.
3454 * If size is zero, we find the largest size that fits.
3456 if (mddev
->sync_thread
)
3458 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3460 if (rdev
->sb_offset
> rdev
->data_offset
)
3461 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
3463 avail
= get_capacity(rdev
->bdev
->bd_disk
)
3464 - rdev
->data_offset
;
3465 if (fit
&& (size
== 0 || size
> avail
/2))
3467 if (avail
< ((sector_t
)size
<< 1))
3470 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
3472 struct block_device
*bdev
;
3474 bdev
= bdget_disk(mddev
->gendisk
, 0);
3476 mutex_lock(&bdev
->bd_inode
->i_mutex
);
3477 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
3478 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
3485 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
3488 /* change the number of raid disks */
3489 if (mddev
->pers
->reshape
== NULL
)
3491 if (raid_disks
<= 0 ||
3492 raid_disks
>= mddev
->max_disks
)
3494 if (mddev
->sync_thread
)
3496 rv
= mddev
->pers
->reshape(mddev
, raid_disks
);
3502 * update_array_info is used to change the configuration of an
3504 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3505 * fields in the info are checked against the array.
3506 * Any differences that cannot be handled will cause an error.
3507 * Normally, only one change can be managed at a time.
3509 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
3515 /* calculate expected state,ignoring low bits */
3516 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3517 state
|= (1 << MD_SB_BITMAP_PRESENT
);
3519 if (mddev
->major_version
!= info
->major_version
||
3520 mddev
->minor_version
!= info
->minor_version
||
3521 /* mddev->patch_version != info->patch_version || */
3522 mddev
->ctime
!= info
->ctime
||
3523 mddev
->level
!= info
->level
||
3524 /* mddev->layout != info->layout || */
3525 !mddev
->persistent
!= info
->not_persistent
||
3526 mddev
->chunk_size
!= info
->chunk_size
||
3527 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3528 ((state
^info
->state
) & 0xfffffe00)
3531 /* Check there is only one change */
3532 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
3533 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
3534 if (mddev
->layout
!= info
->layout
) cnt
++;
3535 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
3536 if (cnt
== 0) return 0;
3537 if (cnt
> 1) return -EINVAL
;
3539 if (mddev
->layout
!= info
->layout
) {
3541 * we don't need to do anything at the md level, the
3542 * personality will take care of it all.
3544 if (mddev
->pers
->reconfig
== NULL
)
3547 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
3549 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
3550 rv
= update_size(mddev
, info
->size
);
3552 if (mddev
->raid_disks
!= info
->raid_disks
)
3553 rv
= update_raid_disks(mddev
, info
->raid_disks
);
3555 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
3556 if (mddev
->pers
->quiesce
== NULL
)
3558 if (mddev
->recovery
|| mddev
->sync_thread
)
3560 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
3561 /* add the bitmap */
3564 if (mddev
->default_bitmap_offset
== 0)
3566 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
3567 mddev
->pers
->quiesce(mddev
, 1);
3568 rv
= bitmap_create(mddev
);
3570 bitmap_destroy(mddev
);
3571 mddev
->pers
->quiesce(mddev
, 0);
3573 /* remove the bitmap */
3576 if (mddev
->bitmap
->file
)
3578 mddev
->pers
->quiesce(mddev
, 1);
3579 bitmap_destroy(mddev
);
3580 mddev
->pers
->quiesce(mddev
, 0);
3581 mddev
->bitmap_offset
= 0;
3584 md_update_sb(mddev
);
3588 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
3592 if (mddev
->pers
== NULL
)
3595 rdev
= find_rdev(mddev
, dev
);
3599 md_error(mddev
, rdev
);
3603 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3605 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
3609 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
3613 static int md_ioctl(struct inode
*inode
, struct file
*file
,
3614 unsigned int cmd
, unsigned long arg
)
3617 void __user
*argp
= (void __user
*)arg
;
3618 mddev_t
*mddev
= NULL
;
3620 if (!capable(CAP_SYS_ADMIN
))
3624 * Commands dealing with the RAID driver but not any
3630 err
= get_version(argp
);
3633 case PRINT_RAID_DEBUG
:
3641 autostart_arrays(arg
);
3648 * Commands creating/starting a new array:
3651 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3659 if (cmd
== START_ARRAY
) {
3660 /* START_ARRAY doesn't need to lock the array as autostart_array
3661 * does the locking, and it could even be a different array
3666 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3667 "START_ARRAY is removed in kernel 2.6.19 and above.\n",
3668 current
->comm
, current
->pid
);
3671 err
= autostart_array(new_decode_dev(arg
));
3673 printk(KERN_WARNING
"md: autostart failed!\n");
3679 err
= mddev_lock(mddev
);
3682 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3689 case SET_ARRAY_INFO
:
3691 mdu_array_info_t info
;
3693 memset(&info
, 0, sizeof(info
));
3694 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
3699 err
= update_array_info(mddev
, &info
);
3701 printk(KERN_WARNING
"md: couldn't update"
3702 " array info. %d\n", err
);
3707 if (!list_empty(&mddev
->disks
)) {
3709 "md: array %s already has disks!\n",
3714 if (mddev
->raid_disks
) {
3716 "md: array %s already initialised!\n",
3721 err
= set_array_info(mddev
, &info
);
3723 printk(KERN_WARNING
"md: couldn't set"
3724 " array info. %d\n", err
);
3734 * Commands querying/configuring an existing array:
3736 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3737 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3738 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
3739 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
3745 * Commands even a read-only array can execute:
3749 case GET_ARRAY_INFO
:
3750 err
= get_array_info(mddev
, argp
);
3753 case GET_BITMAP_FILE
:
3754 err
= get_bitmap_file(mddev
, argp
);
3758 err
= get_disk_info(mddev
, argp
);
3761 case RESTART_ARRAY_RW
:
3762 err
= restart_array(mddev
);
3766 err
= do_md_stop (mddev
, 0);
3770 err
= do_md_stop (mddev
, 1);
3774 * We have a problem here : there is no easy way to give a CHS
3775 * virtual geometry. We currently pretend that we have a 2 heads
3776 * 4 sectors (with a BIG number of cylinders...). This drives
3777 * dosfs just mad... ;-)
3782 * The remaining ioctls are changing the state of the
3783 * superblock, so we do not allow them on read-only arrays.
3784 * However non-MD ioctls (e.g. get-size) will still come through
3785 * here and hit the 'default' below, so only disallow
3786 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3788 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
3789 mddev
->ro
&& mddev
->pers
) {
3790 if (mddev
->ro
== 2) {
3792 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3793 md_wakeup_thread(mddev
->thread
);
3805 mdu_disk_info_t info
;
3806 if (copy_from_user(&info
, argp
, sizeof(info
)))
3809 err
= add_new_disk(mddev
, &info
);
3813 case HOT_REMOVE_DISK
:
3814 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
3818 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
3821 case SET_DISK_FAULTY
:
3822 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
3826 err
= do_md_run (mddev
);
3829 case SET_BITMAP_FILE
:
3830 err
= set_bitmap_file(mddev
, (int)arg
);
3834 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
3835 printk(KERN_WARNING
"md: %s(pid %d) used"
3836 " obsolete MD ioctl, upgrade your"
3837 " software to use new ictls.\n",
3838 current
->comm
, current
->pid
);
3845 mddev_unlock(mddev
);
3855 static int md_open(struct inode
*inode
, struct file
*file
)
3858 * Succeed if we can lock the mddev, which confirms that
3859 * it isn't being stopped right now.
3861 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3864 if ((err
= mddev_lock(mddev
)))
3869 mddev_unlock(mddev
);
3871 check_disk_change(inode
->i_bdev
);
3876 static int md_release(struct inode
*inode
, struct file
* file
)
3878 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3887 static int md_media_changed(struct gendisk
*disk
)
3889 mddev_t
*mddev
= disk
->private_data
;
3891 return mddev
->changed
;
3894 static int md_revalidate(struct gendisk
*disk
)
3896 mddev_t
*mddev
= disk
->private_data
;
3901 static struct block_device_operations md_fops
=
3903 .owner
= THIS_MODULE
,
3905 .release
= md_release
,
3907 .getgeo
= md_getgeo
,
3908 .media_changed
= md_media_changed
,
3909 .revalidate_disk
= md_revalidate
,
3912 static int md_thread(void * arg
)
3914 mdk_thread_t
*thread
= arg
;
3917 * md_thread is a 'system-thread', it's priority should be very
3918 * high. We avoid resource deadlocks individually in each
3919 * raid personality. (RAID5 does preallocation) We also use RR and
3920 * the very same RT priority as kswapd, thus we will never get
3921 * into a priority inversion deadlock.
3923 * we definitely have to have equal or higher priority than
3924 * bdflush, otherwise bdflush will deadlock if there are too
3925 * many dirty RAID5 blocks.
3928 allow_signal(SIGKILL
);
3929 while (!kthread_should_stop()) {
3931 /* We need to wait INTERRUPTIBLE so that
3932 * we don't add to the load-average.
3933 * That means we need to be sure no signals are
3936 if (signal_pending(current
))
3937 flush_signals(current
);
3939 wait_event_interruptible_timeout
3941 test_bit(THREAD_WAKEUP
, &thread
->flags
)
3942 || kthread_should_stop(),
3946 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
3948 thread
->run(thread
->mddev
);
3954 void md_wakeup_thread(mdk_thread_t
*thread
)
3957 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
3958 set_bit(THREAD_WAKEUP
, &thread
->flags
);
3959 wake_up(&thread
->wqueue
);
3963 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
3966 mdk_thread_t
*thread
;
3968 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
3972 init_waitqueue_head(&thread
->wqueue
);
3975 thread
->mddev
= mddev
;
3976 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
3977 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
3978 if (IS_ERR(thread
->tsk
)) {
3985 void md_unregister_thread(mdk_thread_t
*thread
)
3987 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
3989 kthread_stop(thread
->tsk
);
3993 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4000 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4003 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4005 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4006 __builtin_return_address(0),__builtin_return_address(1),
4007 __builtin_return_address(2),__builtin_return_address(3));
4009 if (!mddev
->pers
->error_handler
)
4011 mddev
->pers
->error_handler(mddev
,rdev
);
4012 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4013 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4014 md_wakeup_thread(mddev
->thread
);
4015 md_new_event(mddev
);
4018 /* seq_file implementation /proc/mdstat */
4020 static void status_unused(struct seq_file
*seq
)
4024 struct list_head
*tmp
;
4026 seq_printf(seq
, "unused devices: ");
4028 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4029 char b
[BDEVNAME_SIZE
];
4031 seq_printf(seq
, "%s ",
4032 bdevname(rdev
->bdev
,b
));
4035 seq_printf(seq
, "<none>");
4037 seq_printf(seq
, "\n");
4041 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4043 unsigned long max_blocks
, resync
, res
, dt
, db
, rt
;
4045 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4047 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4048 max_blocks
= mddev
->resync_max_sectors
>> 1;
4050 max_blocks
= mddev
->size
;
4053 * Should not happen.
4059 res
= (resync
/1024)*1000/(max_blocks
/1024 + 1);
4061 int i
, x
= res
/50, y
= 20-x
;
4062 seq_printf(seq
, "[");
4063 for (i
= 0; i
< x
; i
++)
4064 seq_printf(seq
, "=");
4065 seq_printf(seq
, ">");
4066 for (i
= 0; i
< y
; i
++)
4067 seq_printf(seq
, ".");
4068 seq_printf(seq
, "] ");
4070 seq_printf(seq
, " %s =%3lu.%lu%% (%lu/%lu)",
4071 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4072 "resync" : "recovery"),
4073 res
/10, res
% 10, resync
, max_blocks
);
4076 * We do not want to overflow, so the order of operands and
4077 * the * 100 / 100 trick are important. We do a +1 to be
4078 * safe against division by zero. We only estimate anyway.
4080 * dt: time from mark until now
4081 * db: blocks written from mark until now
4082 * rt: remaining time
4084 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4086 db
= resync
- (mddev
->resync_mark_cnt
/2);
4087 rt
= (dt
* ((max_blocks
-resync
) / (db
/100+1)))/100;
4089 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4091 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
4094 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4096 struct list_head
*tmp
;
4106 spin_lock(&all_mddevs_lock
);
4107 list_for_each(tmp
,&all_mddevs
)
4109 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4111 spin_unlock(&all_mddevs_lock
);
4114 spin_unlock(&all_mddevs_lock
);
4116 return (void*)2;/* tail */
4120 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4122 struct list_head
*tmp
;
4123 mddev_t
*next_mddev
, *mddev
= v
;
4129 spin_lock(&all_mddevs_lock
);
4131 tmp
= all_mddevs
.next
;
4133 tmp
= mddev
->all_mddevs
.next
;
4134 if (tmp
!= &all_mddevs
)
4135 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4137 next_mddev
= (void*)2;
4140 spin_unlock(&all_mddevs_lock
);
4148 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4152 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4156 struct mdstat_info
{
4160 static int md_seq_show(struct seq_file
*seq
, void *v
)
4164 struct list_head
*tmp2
;
4166 struct mdstat_info
*mi
= seq
->private;
4167 struct bitmap
*bitmap
;
4169 if (v
== (void*)1) {
4170 struct mdk_personality
*pers
;
4171 seq_printf(seq
, "Personalities : ");
4172 spin_lock(&pers_lock
);
4173 list_for_each_entry(pers
, &pers_list
, list
)
4174 seq_printf(seq
, "[%s] ", pers
->name
);
4176 spin_unlock(&pers_lock
);
4177 seq_printf(seq
, "\n");
4178 mi
->event
= atomic_read(&md_event_count
);
4181 if (v
== (void*)2) {
4186 if (mddev_lock(mddev
)!=0)
4188 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4189 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4190 mddev
->pers
? "" : "in");
4193 seq_printf(seq
, " (read-only)");
4195 seq_printf(seq
, "(auto-read-only)");
4196 seq_printf(seq
, " %s", mddev
->pers
->name
);
4200 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4201 char b
[BDEVNAME_SIZE
];
4202 seq_printf(seq
, " %s[%d]",
4203 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4204 if (test_bit(WriteMostly
, &rdev
->flags
))
4205 seq_printf(seq
, "(W)");
4206 if (test_bit(Faulty
, &rdev
->flags
)) {
4207 seq_printf(seq
, "(F)");
4209 } else if (rdev
->raid_disk
< 0)
4210 seq_printf(seq
, "(S)"); /* spare */
4214 if (!list_empty(&mddev
->disks
)) {
4216 seq_printf(seq
, "\n %llu blocks",
4217 (unsigned long long)mddev
->array_size
);
4219 seq_printf(seq
, "\n %llu blocks",
4220 (unsigned long long)size
);
4222 if (mddev
->persistent
) {
4223 if (mddev
->major_version
!= 0 ||
4224 mddev
->minor_version
!= 90) {
4225 seq_printf(seq
," super %d.%d",
4226 mddev
->major_version
,
4227 mddev
->minor_version
);
4230 seq_printf(seq
, " super non-persistent");
4233 mddev
->pers
->status (seq
, mddev
);
4234 seq_printf(seq
, "\n ");
4235 if (mddev
->pers
->sync_request
) {
4236 if (mddev
->curr_resync
> 2) {
4237 status_resync (seq
, mddev
);
4238 seq_printf(seq
, "\n ");
4239 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4240 seq_printf(seq
, "\tresync=DELAYED\n ");
4241 else if (mddev
->recovery_cp
< MaxSector
)
4242 seq_printf(seq
, "\tresync=PENDING\n ");
4245 seq_printf(seq
, "\n ");
4247 if ((bitmap
= mddev
->bitmap
)) {
4248 unsigned long chunk_kb
;
4249 unsigned long flags
;
4250 spin_lock_irqsave(&bitmap
->lock
, flags
);
4251 chunk_kb
= bitmap
->chunksize
>> 10;
4252 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4254 bitmap
->pages
- bitmap
->missing_pages
,
4256 (bitmap
->pages
- bitmap
->missing_pages
)
4257 << (PAGE_SHIFT
- 10),
4258 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
4259 chunk_kb
? "KB" : "B");
4261 seq_printf(seq
, ", file: ");
4262 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
4263 bitmap
->file
->f_dentry
," \t\n");
4266 seq_printf(seq
, "\n");
4267 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
4270 seq_printf(seq
, "\n");
4272 mddev_unlock(mddev
);
4277 static struct seq_operations md_seq_ops
= {
4278 .start
= md_seq_start
,
4279 .next
= md_seq_next
,
4280 .stop
= md_seq_stop
,
4281 .show
= md_seq_show
,
4284 static int md_seq_open(struct inode
*inode
, struct file
*file
)
4287 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
4291 error
= seq_open(file
, &md_seq_ops
);
4295 struct seq_file
*p
= file
->private_data
;
4297 mi
->event
= atomic_read(&md_event_count
);
4302 static int md_seq_release(struct inode
*inode
, struct file
*file
)
4304 struct seq_file
*m
= file
->private_data
;
4305 struct mdstat_info
*mi
= m
->private;
4308 return seq_release(inode
, file
);
4311 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
4313 struct seq_file
*m
= filp
->private_data
;
4314 struct mdstat_info
*mi
= m
->private;
4317 poll_wait(filp
, &md_event_waiters
, wait
);
4319 /* always allow read */
4320 mask
= POLLIN
| POLLRDNORM
;
4322 if (mi
->event
!= atomic_read(&md_event_count
))
4323 mask
|= POLLERR
| POLLPRI
;
4327 static struct file_operations md_seq_fops
= {
4328 .open
= md_seq_open
,
4330 .llseek
= seq_lseek
,
4331 .release
= md_seq_release
,
4332 .poll
= mdstat_poll
,
4335 int register_md_personality(struct mdk_personality
*p
)
4337 spin_lock(&pers_lock
);
4338 list_add_tail(&p
->list
, &pers_list
);
4339 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
4340 spin_unlock(&pers_lock
);
4344 int unregister_md_personality(struct mdk_personality
*p
)
4346 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
4347 spin_lock(&pers_lock
);
4348 list_del_init(&p
->list
);
4349 spin_unlock(&pers_lock
);
4353 static int is_mddev_idle(mddev_t
*mddev
)
4356 struct list_head
*tmp
;
4358 unsigned long curr_events
;
4361 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4362 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
4363 curr_events
= disk_stat_read(disk
, sectors
[0]) +
4364 disk_stat_read(disk
, sectors
[1]) -
4365 atomic_read(&disk
->sync_io
);
4366 /* The difference between curr_events and last_events
4367 * will be affected by any new non-sync IO (making
4368 * curr_events bigger) and any difference in the amount of
4369 * in-flight syncio (making current_events bigger or smaller)
4370 * The amount in-flight is currently limited to
4371 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4372 * which is at most 4096 sectors.
4373 * These numbers are fairly fragile and should be made
4374 * more robust, probably by enforcing the
4375 * 'window size' that md_do_sync sort-of uses.
4377 * Note: the following is an unsigned comparison.
4379 if ((curr_events
- rdev
->last_events
+ 4096) > 8192) {
4380 rdev
->last_events
= curr_events
;
4387 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
4389 /* another "blocks" (512byte) blocks have been synced */
4390 atomic_sub(blocks
, &mddev
->recovery_active
);
4391 wake_up(&mddev
->recovery_wait
);
4393 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4394 md_wakeup_thread(mddev
->thread
);
4395 // stop recovery, signal do_sync ....
4400 /* md_write_start(mddev, bi)
4401 * If we need to update some array metadata (e.g. 'active' flag
4402 * in superblock) before writing, schedule a superblock update
4403 * and wait for it to complete.
4405 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
4407 if (bio_data_dir(bi
) != WRITE
)
4410 BUG_ON(mddev
->ro
== 1);
4411 if (mddev
->ro
== 2) {
4412 /* need to switch to read/write */
4414 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4415 md_wakeup_thread(mddev
->thread
);
4417 atomic_inc(&mddev
->writes_pending
);
4418 if (mddev
->in_sync
) {
4419 spin_lock_irq(&mddev
->write_lock
);
4420 if (mddev
->in_sync
) {
4422 mddev
->sb_dirty
= 1;
4423 md_wakeup_thread(mddev
->thread
);
4425 spin_unlock_irq(&mddev
->write_lock
);
4427 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
4430 void md_write_end(mddev_t
*mddev
)
4432 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
4433 if (mddev
->safemode
== 2)
4434 md_wakeup_thread(mddev
->thread
);
4436 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
4440 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
4442 #define SYNC_MARKS 10
4443 #define SYNC_MARK_STEP (3*HZ)
4444 static void md_do_sync(mddev_t
*mddev
)
4447 unsigned int currspeed
= 0,
4449 sector_t max_sectors
,j
, io_sectors
;
4450 unsigned long mark
[SYNC_MARKS
];
4451 sector_t mark_cnt
[SYNC_MARKS
];
4453 struct list_head
*tmp
;
4454 sector_t last_check
;
4457 /* just incase thread restarts... */
4458 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
4461 /* we overload curr_resync somewhat here.
4462 * 0 == not engaged in resync at all
4463 * 2 == checking that there is no conflict with another sync
4464 * 1 == like 2, but have yielded to allow conflicting resync to
4466 * other == active in resync - this many blocks
4468 * Before starting a resync we must have set curr_resync to
4469 * 2, and then checked that every "conflicting" array has curr_resync
4470 * less than ours. When we find one that is the same or higher
4471 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4472 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4473 * This will mean we have to start checking from the beginning again.
4478 mddev
->curr_resync
= 2;
4481 if (kthread_should_stop()) {
4482 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4485 ITERATE_MDDEV(mddev2
,tmp
) {
4486 if (mddev2
== mddev
)
4488 if (mddev2
->curr_resync
&&
4489 match_mddev_units(mddev
,mddev2
)) {
4491 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
4492 /* arbitrarily yield */
4493 mddev
->curr_resync
= 1;
4494 wake_up(&resync_wait
);
4496 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
4497 /* no need to wait here, we can wait the next
4498 * time 'round when curr_resync == 2
4501 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
4502 if (!kthread_should_stop() &&
4503 mddev2
->curr_resync
>= mddev
->curr_resync
) {
4504 printk(KERN_INFO
"md: delaying resync of %s"
4505 " until %s has finished resync (they"
4506 " share one or more physical units)\n",
4507 mdname(mddev
), mdname(mddev2
));
4510 finish_wait(&resync_wait
, &wq
);
4513 finish_wait(&resync_wait
, &wq
);
4516 } while (mddev
->curr_resync
< 2);
4518 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4519 /* resync follows the size requested by the personality,
4520 * which defaults to physical size, but can be virtual size
4522 max_sectors
= mddev
->resync_max_sectors
;
4523 mddev
->resync_mismatches
= 0;
4525 /* recovery follows the physical size of devices */
4526 max_sectors
= mddev
->size
<< 1;
4528 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
4529 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
4530 " %d KB/sec/disc.\n", speed_min(mddev
));
4531 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
4532 "(but not more than %d KB/sec) for reconstruction.\n",
4535 is_mddev_idle(mddev
); /* this also initializes IO event counters */
4536 /* we don't use the checkpoint if there's a bitmap */
4537 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
4538 && ! test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4539 j
= mddev
->recovery_cp
;
4543 for (m
= 0; m
< SYNC_MARKS
; m
++) {
4545 mark_cnt
[m
] = io_sectors
;
4548 mddev
->resync_mark
= mark
[last_mark
];
4549 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
4552 * Tune reconstruction:
4554 window
= 32*(PAGE_SIZE
/512);
4555 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
4556 window
/2,(unsigned long long) max_sectors
/2);
4558 atomic_set(&mddev
->recovery_active
, 0);
4559 init_waitqueue_head(&mddev
->recovery_wait
);
4564 "md: resuming recovery of %s from checkpoint.\n",
4566 mddev
->curr_resync
= j
;
4569 while (j
< max_sectors
) {
4573 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
4574 currspeed
< speed_min(mddev
));
4576 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4580 if (!skipped
) { /* actual IO requested */
4581 io_sectors
+= sectors
;
4582 atomic_add(sectors
, &mddev
->recovery_active
);
4586 if (j
>1) mddev
->curr_resync
= j
;
4587 if (last_check
== 0)
4588 /* this is the earliers that rebuilt will be
4589 * visible in /proc/mdstat
4591 md_new_event(mddev
);
4593 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
4596 last_check
= io_sectors
;
4598 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
4599 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
4603 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
4605 int next
= (last_mark
+1) % SYNC_MARKS
;
4607 mddev
->resync_mark
= mark
[next
];
4608 mddev
->resync_mark_cnt
= mark_cnt
[next
];
4609 mark
[next
] = jiffies
;
4610 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
4615 if (kthread_should_stop()) {
4617 * got a signal, exit.
4620 "md: md_do_sync() got signal ... exiting\n");
4621 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4626 * this loop exits only if either when we are slower than
4627 * the 'hard' speed limit, or the system was IO-idle for
4629 * the system might be non-idle CPU-wise, but we only care
4630 * about not overloading the IO subsystem. (things like an
4631 * e2fsck being done on the RAID array should execute fast)
4633 mddev
->queue
->unplug_fn(mddev
->queue
);
4636 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
4637 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
4639 if (currspeed
> speed_min(mddev
)) {
4640 if ((currspeed
> speed_max(mddev
)) ||
4641 !is_mddev_idle(mddev
)) {
4647 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
4649 * this also signals 'finished resyncing' to md_stop
4652 mddev
->queue
->unplug_fn(mddev
->queue
);
4654 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
4656 /* tell personality that we are finished */
4657 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
4659 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4660 mddev
->curr_resync
> 2 &&
4661 mddev
->curr_resync
>= mddev
->recovery_cp
) {
4662 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4664 "md: checkpointing recovery of %s.\n",
4666 mddev
->recovery_cp
= mddev
->curr_resync
;
4668 mddev
->recovery_cp
= MaxSector
;
4672 mddev
->curr_resync
= 0;
4673 wake_up(&resync_wait
);
4674 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4675 md_wakeup_thread(mddev
->thread
);
4680 * This routine is regularly called by all per-raid-array threads to
4681 * deal with generic issues like resync and super-block update.
4682 * Raid personalities that don't have a thread (linear/raid0) do not
4683 * need this as they never do any recovery or update the superblock.
4685 * It does not do any resync itself, but rather "forks" off other threads
4686 * to do that as needed.
4687 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4688 * "->recovery" and create a thread at ->sync_thread.
4689 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4690 * and wakeups up this thread which will reap the thread and finish up.
4691 * This thread also removes any faulty devices (with nr_pending == 0).
4693 * The overall approach is:
4694 * 1/ if the superblock needs updating, update it.
4695 * 2/ If a recovery thread is running, don't do anything else.
4696 * 3/ If recovery has finished, clean up, possibly marking spares active.
4697 * 4/ If there are any faulty devices, remove them.
4698 * 5/ If array is degraded, try to add spares devices
4699 * 6/ If array has spares or is not in-sync, start a resync thread.
4701 void md_check_recovery(mddev_t
*mddev
)
4704 struct list_head
*rtmp
;
4708 bitmap_daemon_work(mddev
->bitmap
);
4713 if (signal_pending(current
)) {
4714 if (mddev
->pers
->sync_request
) {
4715 printk(KERN_INFO
"md: %s in immediate safe mode\n",
4717 mddev
->safemode
= 2;
4719 flush_signals(current
);
4724 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
4725 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
4726 (mddev
->safemode
== 1) ||
4727 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
4728 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
4732 if (mddev_trylock(mddev
)==0) {
4735 spin_lock_irq(&mddev
->write_lock
);
4736 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
4737 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
4739 mddev
->sb_dirty
= 1;
4741 if (mddev
->safemode
== 1)
4742 mddev
->safemode
= 0;
4743 spin_unlock_irq(&mddev
->write_lock
);
4745 if (mddev
->sb_dirty
)
4746 md_update_sb(mddev
);
4749 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4750 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
4751 /* resync/recovery still happening */
4752 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4755 if (mddev
->sync_thread
) {
4756 /* resync has finished, collect result */
4757 md_unregister_thread(mddev
->sync_thread
);
4758 mddev
->sync_thread
= NULL
;
4759 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4760 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4762 /* activate any spares */
4763 mddev
->pers
->spare_active(mddev
);
4765 md_update_sb(mddev
);
4767 /* if array is no-longer degraded, then any saved_raid_disk
4768 * information must be scrapped
4770 if (!mddev
->degraded
)
4771 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4772 rdev
->saved_raid_disk
= -1;
4774 mddev
->recovery
= 0;
4775 /* flag recovery needed just to double check */
4776 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4777 md_new_event(mddev
);
4780 /* Clear some bits that don't mean anything, but
4783 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4784 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4785 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4786 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4788 /* no recovery is running.
4789 * remove any failed drives, then
4790 * add spares if possible.
4791 * Spare are also removed and re-added, to allow
4792 * the personality to fail the re-add.
4794 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4795 if (rdev
->raid_disk
>= 0 &&
4796 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
4797 atomic_read(&rdev
->nr_pending
)==0) {
4798 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
4800 sprintf(nm
,"rd%d", rdev
->raid_disk
);
4801 sysfs_remove_link(&mddev
->kobj
, nm
);
4802 rdev
->raid_disk
= -1;
4806 if (mddev
->degraded
) {
4807 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4808 if (rdev
->raid_disk
< 0
4809 && !test_bit(Faulty
, &rdev
->flags
)) {
4810 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
4812 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4813 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
4815 md_new_event(mddev
);
4822 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4823 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4824 } else if (mddev
->recovery_cp
< MaxSector
) {
4825 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4826 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4827 /* nothing to be done ... */
4830 if (mddev
->pers
->sync_request
) {
4831 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4832 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
4833 /* We are adding a device or devices to an array
4834 * which has the bitmap stored on all devices.
4835 * So make sure all bitmap pages get written
4837 bitmap_write_all(mddev
->bitmap
);
4839 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4842 if (!mddev
->sync_thread
) {
4843 printk(KERN_ERR
"%s: could not start resync"
4846 /* leave the spares where they are, it shouldn't hurt */
4847 mddev
->recovery
= 0;
4849 md_wakeup_thread(mddev
->sync_thread
);
4850 md_new_event(mddev
);
4853 mddev_unlock(mddev
);
4857 static int md_notify_reboot(struct notifier_block
*this,
4858 unsigned long code
, void *x
)
4860 struct list_head
*tmp
;
4863 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
4865 printk(KERN_INFO
"md: stopping all md devices.\n");
4867 ITERATE_MDDEV(mddev
,tmp
)
4868 if (mddev_trylock(mddev
)==0)
4869 do_md_stop (mddev
, 1);
4871 * certain more exotic SCSI devices are known to be
4872 * volatile wrt too early system reboots. While the
4873 * right place to handle this issue is the given
4874 * driver, we do want to have a safe RAID driver ...
4881 static struct notifier_block md_notifier
= {
4882 .notifier_call
= md_notify_reboot
,
4884 .priority
= INT_MAX
, /* before any real devices */
4887 static void md_geninit(void)
4889 struct proc_dir_entry
*p
;
4891 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
4893 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
4895 p
->proc_fops
= &md_seq_fops
;
4898 static int __init
md_init(void)
4902 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4903 " MD_SB_DISKS=%d\n",
4904 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
4905 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
4906 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
4909 if (register_blkdev(MAJOR_NR
, "md"))
4911 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
4912 unregister_blkdev(MAJOR_NR
, "md");
4916 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
4917 md_probe
, NULL
, NULL
);
4918 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
4919 md_probe
, NULL
, NULL
);
4921 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4922 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
4923 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4926 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4927 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
4928 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4932 register_reboot_notifier(&md_notifier
);
4933 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
4943 * Searches all registered partitions for autorun RAID arrays
4946 static dev_t detected_devices
[128];
4949 void md_autodetect_dev(dev_t dev
)
4951 if (dev_cnt
>= 0 && dev_cnt
< 127)
4952 detected_devices
[dev_cnt
++] = dev
;
4956 static void autostart_arrays(int part
)
4961 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
4963 for (i
= 0; i
< dev_cnt
; i
++) {
4964 dev_t dev
= detected_devices
[i
];
4966 rdev
= md_import_device(dev
,0, 0);
4970 if (test_bit(Faulty
, &rdev
->flags
)) {
4974 list_add(&rdev
->same_set
, &pending_raid_disks
);
4978 autorun_devices(part
);
4983 static __exit
void md_exit(void)
4986 struct list_head
*tmp
;
4988 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
4989 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
4990 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4991 devfs_remove("md/%d", i
);
4992 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4993 devfs_remove("md/d%d", i
);
4997 unregister_blkdev(MAJOR_NR
,"md");
4998 unregister_blkdev(mdp_major
, "mdp");
4999 unregister_reboot_notifier(&md_notifier
);
5000 unregister_sysctl_table(raid_table_header
);
5001 remove_proc_entry("mdstat", NULL
);
5002 ITERATE_MDDEV(mddev
,tmp
) {
5003 struct gendisk
*disk
= mddev
->gendisk
;
5006 export_array(mddev
);
5009 mddev
->gendisk
= NULL
;
5014 module_init(md_init
)
5015 module_exit(md_exit
)
5017 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5019 return sprintf(buffer
, "%d", start_readonly
);
5021 static int set_ro(const char *val
, struct kernel_param
*kp
)
5024 int num
= simple_strtoul(val
, &e
, 10);
5025 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5026 start_readonly
= num
;
5032 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, 0600);
5033 module_param(start_dirty_degraded
, int, 0644);
5036 EXPORT_SYMBOL(register_md_personality
);
5037 EXPORT_SYMBOL(unregister_md_personality
);
5038 EXPORT_SYMBOL(md_error
);
5039 EXPORT_SYMBOL(md_done_sync
);
5040 EXPORT_SYMBOL(md_write_start
);
5041 EXPORT_SYMBOL(md_write_end
);
5042 EXPORT_SYMBOL(md_register_thread
);
5043 EXPORT_SYMBOL(md_unregister_thread
);
5044 EXPORT_SYMBOL(md_wakeup_thread
);
5045 EXPORT_SYMBOL(md_print_devices
);
5046 EXPORT_SYMBOL(md_check_recovery
);
5047 MODULE_LICENSE("GPL");
5049 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);