2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
46 #include <linux/init.h>
48 #include <linux/file.h>
51 #include <linux/kmod.h>
54 #include <asm/unaligned.h>
56 #define MAJOR_NR MD_MAJOR
59 /* 63 partitions with the alternate major number (mdp) */
60 #define MdpMinorShift 6
63 #define dprintk(x...) ((void)(DEBUG && printk(x)))
67 static void autostart_arrays (int part
);
70 static mdk_personality_t
*pers
[MAX_PERSONALITY
];
71 static DEFINE_SPINLOCK(pers_lock
);
74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
75 * is 1000 KB/sec, so the extra system load does not show up that much.
76 * Increase it if you want to have more _guaranteed_ speed. Note that
77 * the RAID driver will use the maximum available bandwidth if the IO
78 * subsystem is idle. There is also an 'absolute maximum' reconstruction
79 * speed limit - in case reconstruction slows down your system despite
82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
85 static int sysctl_speed_limit_min
= 1000;
86 static int sysctl_speed_limit_max
= 200000;
88 static struct ctl_table_header
*raid_table_header
;
90 static ctl_table raid_table
[] = {
92 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
93 .procname
= "speed_limit_min",
94 .data
= &sysctl_speed_limit_min
,
95 .maxlen
= sizeof(int),
97 .proc_handler
= &proc_dointvec
,
100 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
101 .procname
= "speed_limit_max",
102 .data
= &sysctl_speed_limit_max
,
103 .maxlen
= sizeof(int),
105 .proc_handler
= &proc_dointvec
,
110 static ctl_table raid_dir_table
[] = {
112 .ctl_name
= DEV_RAID
,
121 static ctl_table raid_root_table
[] = {
127 .child
= raid_dir_table
,
132 static struct block_device_operations md_fops
;
134 static int start_readonly
;
137 * Enables to iterate over all existing md arrays
138 * all_mddevs_lock protects this list.
140 static LIST_HEAD(all_mddevs
);
141 static DEFINE_SPINLOCK(all_mddevs_lock
);
145 * iterates through all used mddevs in the system.
146 * We take care to grab the all_mddevs_lock whenever navigating
147 * the list, and to always hold a refcount when unlocked.
148 * Any code which breaks out of this loop while own
149 * a reference to the current mddev and must mddev_put it.
151 #define ITERATE_MDDEV(mddev,tmp) \
153 for (({ spin_lock(&all_mddevs_lock); \
154 tmp = all_mddevs.next; \
156 ({ if (tmp != &all_mddevs) \
157 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
158 spin_unlock(&all_mddevs_lock); \
159 if (mddev) mddev_put(mddev); \
160 mddev = list_entry(tmp, mddev_t, all_mddevs); \
161 tmp != &all_mddevs;}); \
162 ({ spin_lock(&all_mddevs_lock); \
167 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
169 bio_io_error(bio
, bio
->bi_size
);
173 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
175 atomic_inc(&mddev
->active
);
179 static void mddev_put(mddev_t
*mddev
)
181 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
183 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
184 list_del(&mddev
->all_mddevs
);
185 blk_put_queue(mddev
->queue
);
186 kobject_unregister(&mddev
->kobj
);
188 spin_unlock(&all_mddevs_lock
);
191 static mddev_t
* mddev_find(dev_t unit
)
193 mddev_t
*mddev
, *new = NULL
;
196 spin_lock(&all_mddevs_lock
);
197 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
198 if (mddev
->unit
== unit
) {
200 spin_unlock(&all_mddevs_lock
);
206 list_add(&new->all_mddevs
, &all_mddevs
);
207 spin_unlock(&all_mddevs_lock
);
210 spin_unlock(&all_mddevs_lock
);
212 new = (mddev_t
*) kmalloc(sizeof(*new), GFP_KERNEL
);
216 memset(new, 0, sizeof(*new));
219 if (MAJOR(unit
) == MD_MAJOR
)
220 new->md_minor
= MINOR(unit
);
222 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
224 init_MUTEX(&new->reconfig_sem
);
225 INIT_LIST_HEAD(&new->disks
);
226 INIT_LIST_HEAD(&new->all_mddevs
);
227 init_timer(&new->safemode_timer
);
228 atomic_set(&new->active
, 1);
229 spin_lock_init(&new->write_lock
);
230 init_waitqueue_head(&new->sb_wait
);
232 new->queue
= blk_alloc_queue(GFP_KERNEL
);
238 blk_queue_make_request(new->queue
, md_fail_request
);
243 static inline int mddev_lock(mddev_t
* mddev
)
245 return down_interruptible(&mddev
->reconfig_sem
);
248 static inline void mddev_lock_uninterruptible(mddev_t
* mddev
)
250 down(&mddev
->reconfig_sem
);
253 static inline int mddev_trylock(mddev_t
* mddev
)
255 return down_trylock(&mddev
->reconfig_sem
);
258 static inline void mddev_unlock(mddev_t
* mddev
)
260 up(&mddev
->reconfig_sem
);
262 md_wakeup_thread(mddev
->thread
);
265 mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
268 struct list_head
*tmp
;
270 ITERATE_RDEV(mddev
,rdev
,tmp
) {
271 if (rdev
->desc_nr
== nr
)
277 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
279 struct list_head
*tmp
;
282 ITERATE_RDEV(mddev
,rdev
,tmp
) {
283 if (rdev
->bdev
->bd_dev
== dev
)
289 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
291 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
292 return MD_NEW_SIZE_BLOCKS(size
);
295 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
299 size
= rdev
->sb_offset
;
302 size
&= ~((sector_t
)chunk_size
/1024 - 1);
306 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
311 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
312 if (!rdev
->sb_page
) {
313 printk(KERN_ALERT
"md: out of memory.\n");
320 static void free_disk_sb(mdk_rdev_t
* rdev
)
323 page_cache_release(rdev
->sb_page
);
325 rdev
->sb_page
= NULL
;
332 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
334 mdk_rdev_t
*rdev
= bio
->bi_private
;
335 mddev_t
*mddev
= rdev
->mddev
;
339 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
340 md_error(mddev
, rdev
);
342 if (atomic_dec_and_test(&mddev
->pending_writes
))
343 wake_up(&mddev
->sb_wait
);
348 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
350 struct bio
*bio2
= bio
->bi_private
;
351 mdk_rdev_t
*rdev
= bio2
->bi_private
;
352 mddev_t
*mddev
= rdev
->mddev
;
356 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
357 error
== -EOPNOTSUPP
) {
359 /* barriers don't appear to be supported :-( */
360 set_bit(BarriersNotsupp
, &rdev
->flags
);
361 mddev
->barriers_work
= 0;
362 spin_lock_irqsave(&mddev
->write_lock
, flags
);
363 bio2
->bi_next
= mddev
->biolist
;
364 mddev
->biolist
= bio2
;
365 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
366 wake_up(&mddev
->sb_wait
);
371 bio
->bi_private
= rdev
;
372 return super_written(bio
, bytes_done
, error
);
375 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
376 sector_t sector
, int size
, struct page
*page
)
378 /* write first size bytes of page to sector of rdev
379 * Increment mddev->pending_writes before returning
380 * and decrement it on completion, waking up sb_wait
381 * if zero is reached.
382 * If an error occurred, call md_error
384 * As we might need to resubmit the request if BIO_RW_BARRIER
385 * causes ENOTSUPP, we allocate a spare bio...
387 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
388 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
390 bio
->bi_bdev
= rdev
->bdev
;
391 bio
->bi_sector
= sector
;
392 bio_add_page(bio
, page
, size
, 0);
393 bio
->bi_private
= rdev
;
394 bio
->bi_end_io
= super_written
;
397 atomic_inc(&mddev
->pending_writes
);
398 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
400 rw
|= (1<<BIO_RW_BARRIER
);
401 rbio
= bio_clone(bio
, GFP_NOIO
);
402 rbio
->bi_private
= bio
;
403 rbio
->bi_end_io
= super_written_barrier
;
404 submit_bio(rw
, rbio
);
409 void md_super_wait(mddev_t
*mddev
)
411 /* wait for all superblock writes that were scheduled to complete.
412 * if any had to be retried (due to BARRIER problems), retry them
416 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
417 if (atomic_read(&mddev
->pending_writes
)==0)
419 while (mddev
->biolist
) {
421 spin_lock_irq(&mddev
->write_lock
);
422 bio
= mddev
->biolist
;
423 mddev
->biolist
= bio
->bi_next
;
425 spin_unlock_irq(&mddev
->write_lock
);
426 submit_bio(bio
->bi_rw
, bio
);
430 finish_wait(&mddev
->sb_wait
, &wq
);
433 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
438 complete((struct completion
*)bio
->bi_private
);
442 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
443 struct page
*page
, int rw
)
445 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
446 struct completion event
;
449 rw
|= (1 << BIO_RW_SYNC
);
452 bio
->bi_sector
= sector
;
453 bio_add_page(bio
, page
, size
, 0);
454 init_completion(&event
);
455 bio
->bi_private
= &event
;
456 bio
->bi_end_io
= bi_complete
;
458 wait_for_completion(&event
);
460 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
465 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
467 char b
[BDEVNAME_SIZE
];
468 if (!rdev
->sb_page
) {
476 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
482 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
483 bdevname(rdev
->bdev
,b
));
487 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
489 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
490 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
491 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
492 (sb1
->set_uuid3
== sb2
->set_uuid3
))
500 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
503 mdp_super_t
*tmp1
, *tmp2
;
505 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
506 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
508 if (!tmp1
|| !tmp2
) {
510 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
518 * nr_disks is not constant
523 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
534 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
536 unsigned int disk_csum
, csum
;
538 disk_csum
= sb
->sb_csum
;
540 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
541 sb
->sb_csum
= disk_csum
;
547 * Handle superblock details.
548 * We want to be able to handle multiple superblock formats
549 * so we have a common interface to them all, and an array of
550 * different handlers.
551 * We rely on user-space to write the initial superblock, and support
552 * reading and updating of superblocks.
553 * Interface methods are:
554 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
555 * loads and validates a superblock on dev.
556 * if refdev != NULL, compare superblocks on both devices
558 * 0 - dev has a superblock that is compatible with refdev
559 * 1 - dev has a superblock that is compatible and newer than refdev
560 * so dev should be used as the refdev in future
561 * -EINVAL superblock incompatible or invalid
562 * -othererror e.g. -EIO
564 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
565 * Verify that dev is acceptable into mddev.
566 * The first time, mddev->raid_disks will be 0, and data from
567 * dev should be merged in. Subsequent calls check that dev
568 * is new enough. Return 0 or -EINVAL
570 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
571 * Update the superblock for rdev with data in mddev
572 * This does not write to disc.
578 struct module
*owner
;
579 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
580 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
581 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
585 * load_super for 0.90.0
587 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
589 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
595 * Calculate the position of the superblock,
596 * it's at the end of the disk.
598 * It also happens to be a multiple of 4Kb.
600 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
601 rdev
->sb_offset
= sb_offset
;
603 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
608 bdevname(rdev
->bdev
, b
);
609 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
611 if (sb
->md_magic
!= MD_SB_MAGIC
) {
612 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
617 if (sb
->major_version
!= 0 ||
618 sb
->minor_version
!= 90) {
619 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
620 sb
->major_version
, sb
->minor_version
,
625 if (sb
->raid_disks
<= 0)
628 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
629 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
634 rdev
->preferred_minor
= sb
->md_minor
;
635 rdev
->data_offset
= 0;
636 rdev
->sb_size
= MD_SB_BYTES
;
638 if (sb
->level
== LEVEL_MULTIPATH
)
641 rdev
->desc_nr
= sb
->this_disk
.number
;
647 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
648 if (!uuid_equal(refsb
, sb
)) {
649 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
650 b
, bdevname(refdev
->bdev
,b2
));
653 if (!sb_equal(refsb
, sb
)) {
654 printk(KERN_WARNING
"md: %s has same UUID"
655 " but different superblock to %s\n",
656 b
, bdevname(refdev
->bdev
, b2
));
660 ev2
= md_event(refsb
);
666 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
673 * validate_super for 0.90.0
675 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
678 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
680 rdev
->raid_disk
= -1;
682 if (mddev
->raid_disks
== 0) {
683 mddev
->major_version
= 0;
684 mddev
->minor_version
= sb
->minor_version
;
685 mddev
->patch_version
= sb
->patch_version
;
686 mddev
->persistent
= ! sb
->not_persistent
;
687 mddev
->chunk_size
= sb
->chunk_size
;
688 mddev
->ctime
= sb
->ctime
;
689 mddev
->utime
= sb
->utime
;
690 mddev
->level
= sb
->level
;
691 mddev
->layout
= sb
->layout
;
692 mddev
->raid_disks
= sb
->raid_disks
;
693 mddev
->size
= sb
->size
;
694 mddev
->events
= md_event(sb
);
695 mddev
->bitmap_offset
= 0;
696 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
698 if (sb
->state
& (1<<MD_SB_CLEAN
))
699 mddev
->recovery_cp
= MaxSector
;
701 if (sb
->events_hi
== sb
->cp_events_hi
&&
702 sb
->events_lo
== sb
->cp_events_lo
) {
703 mddev
->recovery_cp
= sb
->recovery_cp
;
705 mddev
->recovery_cp
= 0;
708 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
709 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
710 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
711 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
713 mddev
->max_disks
= MD_SB_DISKS
;
715 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
716 mddev
->bitmap_file
== NULL
) {
717 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6) {
718 /* FIXME use a better test */
719 printk(KERN_WARNING
"md: bitmaps only support for raid1\n");
722 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
725 } else if (mddev
->pers
== NULL
) {
726 /* Insist on good event counter while assembling */
727 __u64 ev1
= md_event(sb
);
729 if (ev1
< mddev
->events
)
731 } else if (mddev
->bitmap
) {
732 /* if adding to array with a bitmap, then we can accept an
733 * older device ... but not too old.
735 __u64 ev1
= md_event(sb
);
736 if (ev1
< mddev
->bitmap
->events_cleared
)
738 } else /* just a hot-add of a new device, leave raid_disk at -1 */
741 if (mddev
->level
!= LEVEL_MULTIPATH
) {
742 desc
= sb
->disks
+ rdev
->desc_nr
;
744 if (desc
->state
& (1<<MD_DISK_FAULTY
))
745 set_bit(Faulty
, &rdev
->flags
);
746 else if (desc
->state
& (1<<MD_DISK_SYNC
) &&
747 desc
->raid_disk
< mddev
->raid_disks
) {
748 set_bit(In_sync
, &rdev
->flags
);
749 rdev
->raid_disk
= desc
->raid_disk
;
751 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
752 set_bit(WriteMostly
, &rdev
->flags
);
753 } else /* MULTIPATH are always insync */
754 set_bit(In_sync
, &rdev
->flags
);
759 * sync_super for 0.90.0
761 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
764 struct list_head
*tmp
;
766 int next_spare
= mddev
->raid_disks
;
769 /* make rdev->sb match mddev data..
772 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
773 * 3/ any empty disks < next_spare become removed
775 * disks[0] gets initialised to REMOVED because
776 * we cannot be sure from other fields if it has
777 * been initialised or not.
780 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
782 rdev
->sb_size
= MD_SB_BYTES
;
784 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
786 memset(sb
, 0, sizeof(*sb
));
788 sb
->md_magic
= MD_SB_MAGIC
;
789 sb
->major_version
= mddev
->major_version
;
790 sb
->minor_version
= mddev
->minor_version
;
791 sb
->patch_version
= mddev
->patch_version
;
792 sb
->gvalid_words
= 0; /* ignored */
793 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
794 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
795 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
796 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
798 sb
->ctime
= mddev
->ctime
;
799 sb
->level
= mddev
->level
;
800 sb
->size
= mddev
->size
;
801 sb
->raid_disks
= mddev
->raid_disks
;
802 sb
->md_minor
= mddev
->md_minor
;
803 sb
->not_persistent
= !mddev
->persistent
;
804 sb
->utime
= mddev
->utime
;
806 sb
->events_hi
= (mddev
->events
>>32);
807 sb
->events_lo
= (u32
)mddev
->events
;
811 sb
->recovery_cp
= mddev
->recovery_cp
;
812 sb
->cp_events_hi
= (mddev
->events
>>32);
813 sb
->cp_events_lo
= (u32
)mddev
->events
;
814 if (mddev
->recovery_cp
== MaxSector
)
815 sb
->state
= (1<< MD_SB_CLEAN
);
819 sb
->layout
= mddev
->layout
;
820 sb
->chunk_size
= mddev
->chunk_size
;
822 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
823 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
825 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
826 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
829 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
830 && !test_bit(Faulty
, &rdev2
->flags
))
831 desc_nr
= rdev2
->raid_disk
;
833 desc_nr
= next_spare
++;
834 rdev2
->desc_nr
= desc_nr
;
835 d
= &sb
->disks
[rdev2
->desc_nr
];
837 d
->number
= rdev2
->desc_nr
;
838 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
839 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
840 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
841 && !test_bit(Faulty
, &rdev2
->flags
))
842 d
->raid_disk
= rdev2
->raid_disk
;
844 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
845 if (test_bit(Faulty
, &rdev2
->flags
)) {
846 d
->state
= (1<<MD_DISK_FAULTY
);
848 } else if (test_bit(In_sync
, &rdev2
->flags
)) {
849 d
->state
= (1<<MD_DISK_ACTIVE
);
850 d
->state
|= (1<<MD_DISK_SYNC
);
858 if (test_bit(WriteMostly
, &rdev2
->flags
))
859 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
861 /* now set the "removed" and "faulty" bits on any missing devices */
862 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
863 mdp_disk_t
*d
= &sb
->disks
[i
];
864 if (d
->state
== 0 && d
->number
== 0) {
867 d
->state
= (1<<MD_DISK_REMOVED
);
868 d
->state
|= (1<<MD_DISK_FAULTY
);
872 sb
->nr_disks
= nr_disks
;
873 sb
->active_disks
= active
;
874 sb
->working_disks
= working
;
875 sb
->failed_disks
= failed
;
876 sb
->spare_disks
= spare
;
878 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
879 sb
->sb_csum
= calc_sb_csum(sb
);
883 * version 1 superblock
886 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
888 unsigned int disk_csum
, csum
;
889 unsigned long long newcsum
;
890 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
891 unsigned int *isuper
= (unsigned int*)sb
;
894 disk_csum
= sb
->sb_csum
;
897 for (i
=0; size
>=4; size
-= 4 )
898 newcsum
+= le32_to_cpu(*isuper
++);
901 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
903 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
904 sb
->sb_csum
= disk_csum
;
905 return cpu_to_le32(csum
);
908 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
910 struct mdp_superblock_1
*sb
;
913 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
917 * Calculate the position of the superblock.
918 * It is always aligned to a 4K boundary and
919 * depeding on minor_version, it can be:
920 * 0: At least 8K, but less than 12K, from end of device
921 * 1: At start of device
922 * 2: 4K from start of device.
924 switch(minor_version
) {
926 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
928 sb_offset
&= ~(sector_t
)(4*2-1);
929 /* convert from sectors to K */
941 rdev
->sb_offset
= sb_offset
;
943 /* superblock is rarely larger than 1K, but it can be larger,
944 * and it is safe to read 4k, so we do that
946 ret
= read_disk_sb(rdev
, 4096);
950 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
952 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
953 sb
->major_version
!= cpu_to_le32(1) ||
954 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
955 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
956 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
959 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
960 printk("md: invalid superblock checksum on %s\n",
961 bdevname(rdev
->bdev
,b
));
964 if (le64_to_cpu(sb
->data_size
) < 10) {
965 printk("md: data_size too small on %s\n",
966 bdevname(rdev
->bdev
,b
));
969 rdev
->preferred_minor
= 0xffff;
970 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
972 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
973 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
974 if (rdev
->sb_size
& bmask
)
975 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
981 struct mdp_superblock_1
*refsb
=
982 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
984 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
985 sb
->level
!= refsb
->level
||
986 sb
->layout
!= refsb
->layout
||
987 sb
->chunksize
!= refsb
->chunksize
) {
988 printk(KERN_WARNING
"md: %s has strangely different"
989 " superblock to %s\n",
990 bdevname(rdev
->bdev
,b
),
991 bdevname(refdev
->bdev
,b2
));
994 ev1
= le64_to_cpu(sb
->events
);
995 ev2
= le64_to_cpu(refsb
->events
);
1001 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1003 rdev
->size
= rdev
->sb_offset
;
1004 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1006 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1007 if (le32_to_cpu(sb
->chunksize
))
1008 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1012 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1014 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1016 rdev
->raid_disk
= -1;
1018 if (mddev
->raid_disks
== 0) {
1019 mddev
->major_version
= 1;
1020 mddev
->patch_version
= 0;
1021 mddev
->persistent
= 1;
1022 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1023 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1024 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1025 mddev
->level
= le32_to_cpu(sb
->level
);
1026 mddev
->layout
= le32_to_cpu(sb
->layout
);
1027 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1028 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1029 mddev
->events
= le64_to_cpu(sb
->events
);
1030 mddev
->bitmap_offset
= 0;
1031 mddev
->default_bitmap_offset
= 0;
1032 mddev
->default_bitmap_offset
= 1024;
1034 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1035 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1037 mddev
->max_disks
= (4096-256)/2;
1039 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1040 mddev
->bitmap_file
== NULL
) {
1041 if (mddev
->level
!= 1) {
1042 printk(KERN_WARNING
"md: bitmaps only supported for raid1\n");
1045 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1047 } else if (mddev
->pers
== NULL
) {
1048 /* Insist of good event counter while assembling */
1049 __u64 ev1
= le64_to_cpu(sb
->events
);
1051 if (ev1
< mddev
->events
)
1053 } else if (mddev
->bitmap
) {
1054 /* If adding to array with a bitmap, then we can accept an
1055 * older device, but not too old.
1057 __u64 ev1
= le64_to_cpu(sb
->events
);
1058 if (ev1
< mddev
->bitmap
->events_cleared
)
1060 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1063 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1065 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1066 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1068 case 0xffff: /* spare */
1070 case 0xfffe: /* faulty */
1071 set_bit(Faulty
, &rdev
->flags
);
1074 set_bit(In_sync
, &rdev
->flags
);
1075 rdev
->raid_disk
= role
;
1078 if (sb
->devflags
& WriteMostly1
)
1079 set_bit(WriteMostly
, &rdev
->flags
);
1080 } else /* MULTIPATH are always insync */
1081 set_bit(In_sync
, &rdev
->flags
);
1086 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1088 struct mdp_superblock_1
*sb
;
1089 struct list_head
*tmp
;
1092 /* make rdev->sb match mddev and rdev data. */
1094 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1096 sb
->feature_map
= 0;
1098 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1099 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1100 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1102 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1103 sb
->events
= cpu_to_le64(mddev
->events
);
1105 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1107 sb
->resync_offset
= cpu_to_le64(0);
1109 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1110 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1111 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1115 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1116 if (rdev2
->desc_nr
+1 > max_dev
)
1117 max_dev
= rdev2
->desc_nr
+1;
1119 sb
->max_dev
= cpu_to_le32(max_dev
);
1120 for (i
=0; i
<max_dev
;i
++)
1121 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1123 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1125 if (test_bit(Faulty
, &rdev2
->flags
))
1126 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1127 else if (test_bit(In_sync
, &rdev2
->flags
))
1128 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1130 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1133 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1134 sb
->sb_csum
= calc_sb_1_csum(sb
);
1138 static struct super_type super_types
[] = {
1141 .owner
= THIS_MODULE
,
1142 .load_super
= super_90_load
,
1143 .validate_super
= super_90_validate
,
1144 .sync_super
= super_90_sync
,
1148 .owner
= THIS_MODULE
,
1149 .load_super
= super_1_load
,
1150 .validate_super
= super_1_validate
,
1151 .sync_super
= super_1_sync
,
1155 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1157 struct list_head
*tmp
;
1160 ITERATE_RDEV(mddev
,rdev
,tmp
)
1161 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1167 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1169 struct list_head
*tmp
;
1172 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1173 if (match_dev_unit(mddev2
, rdev
))
1179 static LIST_HEAD(pending_raid_disks
);
1181 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1183 mdk_rdev_t
*same_pdev
;
1184 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1190 same_pdev
= match_dev_unit(mddev
, rdev
);
1193 "%s: WARNING: %s appears to be on the same physical"
1194 " disk as %s. True\n protection against single-disk"
1195 " failure might be compromised.\n",
1196 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1197 bdevname(same_pdev
->bdev
,b2
));
1199 /* Verify rdev->desc_nr is unique.
1200 * If it is -1, assign a free number, else
1201 * check number is not in use
1203 if (rdev
->desc_nr
< 0) {
1205 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1206 while (find_rdev_nr(mddev
, choice
))
1208 rdev
->desc_nr
= choice
;
1210 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1213 bdevname(rdev
->bdev
,b
);
1214 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1217 list_add(&rdev
->same_set
, &mddev
->disks
);
1218 rdev
->mddev
= mddev
;
1219 printk(KERN_INFO
"md: bind<%s>\n", b
);
1221 rdev
->kobj
.parent
= &mddev
->kobj
;
1222 kobject_add(&rdev
->kobj
);
1224 sysfs_create_link(&rdev
->kobj
, &rdev
->bdev
->bd_disk
->kobj
, "block");
1228 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1230 char b
[BDEVNAME_SIZE
];
1235 list_del_init(&rdev
->same_set
);
1236 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1238 sysfs_remove_link(&rdev
->kobj
, "block");
1239 kobject_del(&rdev
->kobj
);
1243 * prevent the device from being mounted, repartitioned or
1244 * otherwise reused by a RAID array (or any other kernel
1245 * subsystem), by bd_claiming the device.
1247 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1250 struct block_device
*bdev
;
1251 char b
[BDEVNAME_SIZE
];
1253 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1255 printk(KERN_ERR
"md: could not open %s.\n",
1256 __bdevname(dev
, b
));
1257 return PTR_ERR(bdev
);
1259 err
= bd_claim(bdev
, rdev
);
1261 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1270 static void unlock_rdev(mdk_rdev_t
*rdev
)
1272 struct block_device
*bdev
= rdev
->bdev
;
1280 void md_autodetect_dev(dev_t dev
);
1282 static void export_rdev(mdk_rdev_t
* rdev
)
1284 char b
[BDEVNAME_SIZE
];
1285 printk(KERN_INFO
"md: export_rdev(%s)\n",
1286 bdevname(rdev
->bdev
,b
));
1290 list_del_init(&rdev
->same_set
);
1292 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1295 kobject_put(&rdev
->kobj
);
1298 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1300 unbind_rdev_from_array(rdev
);
1304 static void export_array(mddev_t
*mddev
)
1306 struct list_head
*tmp
;
1309 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1314 kick_rdev_from_array(rdev
);
1316 if (!list_empty(&mddev
->disks
))
1318 mddev
->raid_disks
= 0;
1319 mddev
->major_version
= 0;
1322 static void print_desc(mdp_disk_t
*desc
)
1324 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1325 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1328 static void print_sb(mdp_super_t
*sb
)
1333 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1334 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1335 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1337 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1338 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1339 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1340 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1341 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1342 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1343 sb
->failed_disks
, sb
->spare_disks
,
1344 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1347 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1350 desc
= sb
->disks
+ i
;
1351 if (desc
->number
|| desc
->major
|| desc
->minor
||
1352 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1353 printk(" D %2d: ", i
);
1357 printk(KERN_INFO
"md: THIS: ");
1358 print_desc(&sb
->this_disk
);
1362 static void print_rdev(mdk_rdev_t
*rdev
)
1364 char b
[BDEVNAME_SIZE
];
1365 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1366 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1367 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1369 if (rdev
->sb_loaded
) {
1370 printk(KERN_INFO
"md: rdev superblock:\n");
1371 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1373 printk(KERN_INFO
"md: no rdev superblock!\n");
1376 void md_print_devices(void)
1378 struct list_head
*tmp
, *tmp2
;
1381 char b
[BDEVNAME_SIZE
];
1384 printk("md: **********************************\n");
1385 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1386 printk("md: **********************************\n");
1387 ITERATE_MDDEV(mddev
,tmp
) {
1390 bitmap_print_sb(mddev
->bitmap
);
1392 printk("%s: ", mdname(mddev
));
1393 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1394 printk("<%s>", bdevname(rdev
->bdev
,b
));
1397 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1400 printk("md: **********************************\n");
1405 static void sync_sbs(mddev_t
* mddev
)
1408 struct list_head
*tmp
;
1410 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1411 super_types
[mddev
->major_version
].
1412 sync_super(mddev
, rdev
);
1413 rdev
->sb_loaded
= 1;
1417 static void md_update_sb(mddev_t
* mddev
)
1420 struct list_head
*tmp
;
1425 spin_lock_irq(&mddev
->write_lock
);
1426 sync_req
= mddev
->in_sync
;
1427 mddev
->utime
= get_seconds();
1430 if (!mddev
->events
) {
1432 * oops, this 64-bit counter should never wrap.
1433 * Either we are in around ~1 trillion A.C., assuming
1434 * 1 reboot per second, or we have a bug:
1439 mddev
->sb_dirty
= 2;
1443 * do not write anything to disk if using
1444 * nonpersistent superblocks
1446 if (!mddev
->persistent
) {
1447 mddev
->sb_dirty
= 0;
1448 spin_unlock_irq(&mddev
->write_lock
);
1449 wake_up(&mddev
->sb_wait
);
1452 spin_unlock_irq(&mddev
->write_lock
);
1455 "md: updating %s RAID superblock on device (in sync %d)\n",
1456 mdname(mddev
),mddev
->in_sync
);
1458 err
= bitmap_update_sb(mddev
->bitmap
);
1459 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1460 char b
[BDEVNAME_SIZE
];
1461 dprintk(KERN_INFO
"md: ");
1462 if (test_bit(Faulty
, &rdev
->flags
))
1463 dprintk("(skipping faulty ");
1465 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1466 if (!test_bit(Faulty
, &rdev
->flags
)) {
1467 md_super_write(mddev
,rdev
,
1468 rdev
->sb_offset
<<1, rdev
->sb_size
,
1470 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1471 bdevname(rdev
->bdev
,b
),
1472 (unsigned long long)rdev
->sb_offset
);
1476 if (mddev
->level
== LEVEL_MULTIPATH
)
1477 /* only need to write one superblock... */
1480 md_super_wait(mddev
);
1481 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1483 spin_lock_irq(&mddev
->write_lock
);
1484 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1485 /* have to write it out again */
1486 spin_unlock_irq(&mddev
->write_lock
);
1489 mddev
->sb_dirty
= 0;
1490 spin_unlock_irq(&mddev
->write_lock
);
1491 wake_up(&mddev
->sb_wait
);
1495 struct rdev_sysfs_entry
{
1496 struct attribute attr
;
1497 ssize_t (*show
)(mdk_rdev_t
*, char *);
1498 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1502 rdev_show_state(mdk_rdev_t
*rdev
, char *page
)
1507 if (test_bit(Faulty
, &rdev
->flags
)) {
1508 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1511 if (test_bit(In_sync
, &rdev
->flags
)) {
1512 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1515 if (!test_bit(Faulty
, &rdev
->flags
) &&
1516 !test_bit(In_sync
, &rdev
->flags
)) {
1517 len
+= sprintf(page
+len
, "%sspare", sep
);
1520 return len
+sprintf(page
+len
, "\n");
1523 static struct rdev_sysfs_entry rdev_state
= {
1524 .attr
= {.name
= "state", .mode
= S_IRUGO
},
1525 .show
= rdev_show_state
,
1529 rdev_show_super(mdk_rdev_t
*rdev
, char *page
)
1531 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1532 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1533 return rdev
->sb_size
;
1537 static struct rdev_sysfs_entry rdev_super
= {
1538 .attr
= {.name
= "super", .mode
= S_IRUGO
},
1539 .show
= rdev_show_super
,
1541 static struct attribute
*rdev_default_attrs
[] = {
1547 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1549 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1550 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1554 return entry
->show(rdev
, page
);
1558 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1559 const char *page
, size_t length
)
1561 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1562 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1566 return entry
->store(rdev
, page
, length
);
1569 static void rdev_free(struct kobject
*ko
)
1571 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1574 static struct sysfs_ops rdev_sysfs_ops
= {
1575 .show
= rdev_attr_show
,
1576 .store
= rdev_attr_store
,
1578 static struct kobj_type rdev_ktype
= {
1579 .release
= rdev_free
,
1580 .sysfs_ops
= &rdev_sysfs_ops
,
1581 .default_attrs
= rdev_default_attrs
,
1585 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1587 * mark the device faulty if:
1589 * - the device is nonexistent (zero size)
1590 * - the device has no valid superblock
1592 * a faulty rdev _never_ has rdev->sb set.
1594 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1596 char b
[BDEVNAME_SIZE
];
1601 rdev
= (mdk_rdev_t
*) kmalloc(sizeof(*rdev
), GFP_KERNEL
);
1603 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1604 return ERR_PTR(-ENOMEM
);
1606 memset(rdev
, 0, sizeof(*rdev
));
1608 if ((err
= alloc_disk_sb(rdev
)))
1611 err
= lock_rdev(rdev
, newdev
);
1615 rdev
->kobj
.parent
= NULL
;
1616 rdev
->kobj
.ktype
= &rdev_ktype
;
1617 kobject_init(&rdev
->kobj
);
1621 rdev
->data_offset
= 0;
1622 atomic_set(&rdev
->nr_pending
, 0);
1623 atomic_set(&rdev
->read_errors
, 0);
1625 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1628 "md: %s has zero or unknown size, marking faulty!\n",
1629 bdevname(rdev
->bdev
,b
));
1634 if (super_format
>= 0) {
1635 err
= super_types
[super_format
].
1636 load_super(rdev
, NULL
, super_minor
);
1637 if (err
== -EINVAL
) {
1639 "md: %s has invalid sb, not importing!\n",
1640 bdevname(rdev
->bdev
,b
));
1645 "md: could not read %s's sb, not importing!\n",
1646 bdevname(rdev
->bdev
,b
));
1650 INIT_LIST_HEAD(&rdev
->same_set
);
1655 if (rdev
->sb_page
) {
1661 return ERR_PTR(err
);
1665 * Check a full RAID array for plausibility
1669 static void analyze_sbs(mddev_t
* mddev
)
1672 struct list_head
*tmp
;
1673 mdk_rdev_t
*rdev
, *freshest
;
1674 char b
[BDEVNAME_SIZE
];
1677 ITERATE_RDEV(mddev
,rdev
,tmp
)
1678 switch (super_types
[mddev
->major_version
].
1679 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1687 "md: fatal superblock inconsistency in %s"
1688 " -- removing from array\n",
1689 bdevname(rdev
->bdev
,b
));
1690 kick_rdev_from_array(rdev
);
1694 super_types
[mddev
->major_version
].
1695 validate_super(mddev
, freshest
);
1698 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1699 if (rdev
!= freshest
)
1700 if (super_types
[mddev
->major_version
].
1701 validate_super(mddev
, rdev
)) {
1702 printk(KERN_WARNING
"md: kicking non-fresh %s"
1704 bdevname(rdev
->bdev
,b
));
1705 kick_rdev_from_array(rdev
);
1708 if (mddev
->level
== LEVEL_MULTIPATH
) {
1709 rdev
->desc_nr
= i
++;
1710 rdev
->raid_disk
= rdev
->desc_nr
;
1711 set_bit(In_sync
, &rdev
->flags
);
1717 if (mddev
->recovery_cp
!= MaxSector
&&
1719 printk(KERN_ERR
"md: %s: raid array is not clean"
1720 " -- starting background reconstruction\n",
1726 md_show_level(mddev_t
*mddev
, char *page
)
1728 mdk_personality_t
*p
= mddev
->pers
;
1731 if (mddev
->level
>= 0)
1732 return sprintf(page
, "RAID-%d\n", mddev
->level
);
1734 return sprintf(page
, "%s\n", p
->name
);
1737 static struct md_sysfs_entry md_level
= {
1738 .attr
= {.name
= "level", .mode
= S_IRUGO
},
1739 .show
= md_show_level
,
1743 md_show_rdisks(mddev_t
*mddev
, char *page
)
1745 return sprintf(page
, "%d\n", mddev
->raid_disks
);
1748 static struct md_sysfs_entry md_raid_disks
= {
1749 .attr
= {.name
= "raid_disks", .mode
= S_IRUGO
},
1750 .show
= md_show_rdisks
,
1754 md_show_scan(mddev_t
*mddev
, char *page
)
1756 char *type
= "none";
1757 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
1758 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
1759 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
1760 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
1762 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
1769 return sprintf(page
, "%s\n", type
);
1773 md_store_scan(mddev_t
*mddev
, const char *page
, size_t len
)
1777 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
1778 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
1780 down(&mddev
->reconfig_sem
);
1781 if (mddev
->pers
&& mddev
->pers
->sync_request
)
1783 up(&mddev
->reconfig_sem
);
1787 if (strcmp(page
, "check")==0 || strcmp(page
, "check\n")==0)
1788 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
1789 else if (strcmp(page
, "repair")!=0 && strcmp(page
, "repair\n")!=0)
1791 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
1792 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
1793 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
1794 md_wakeup_thread(mddev
->thread
);
1799 md_show_mismatch(mddev_t
*mddev
, char *page
)
1801 return sprintf(page
, "%llu\n",
1802 (unsigned long long) mddev
->resync_mismatches
);
1805 static struct md_sysfs_entry md_scan_mode
= {
1806 .attr
= {.name
= "scan_mode", .mode
= S_IRUGO
|S_IWUSR
},
1807 .show
= md_show_scan
,
1808 .store
= md_store_scan
,
1811 static struct md_sysfs_entry md_mismatches
= {
1812 .attr
= {.name
= "mismatch_cnt", .mode
= S_IRUGO
},
1813 .show
= md_show_mismatch
,
1816 static struct attribute
*md_default_attrs
[] = {
1818 &md_raid_disks
.attr
,
1820 &md_mismatches
.attr
,
1825 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1827 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
1828 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
1832 return entry
->show(mddev
, page
);
1836 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1837 const char *page
, size_t length
)
1839 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
1840 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
1844 return entry
->store(mddev
, page
, length
);
1847 static void md_free(struct kobject
*ko
)
1849 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
1853 static struct sysfs_ops md_sysfs_ops
= {
1854 .show
= md_attr_show
,
1855 .store
= md_attr_store
,
1857 static struct kobj_type md_ktype
= {
1859 .sysfs_ops
= &md_sysfs_ops
,
1860 .default_attrs
= md_default_attrs
,
1865 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
1867 static DECLARE_MUTEX(disks_sem
);
1868 mddev_t
*mddev
= mddev_find(dev
);
1869 struct gendisk
*disk
;
1870 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
1871 int shift
= partitioned
? MdpMinorShift
: 0;
1872 int unit
= MINOR(dev
) >> shift
;
1878 if (mddev
->gendisk
) {
1883 disk
= alloc_disk(1 << shift
);
1889 disk
->major
= MAJOR(dev
);
1890 disk
->first_minor
= unit
<< shift
;
1892 sprintf(disk
->disk_name
, "md_d%d", unit
);
1893 sprintf(disk
->devfs_name
, "md/d%d", unit
);
1895 sprintf(disk
->disk_name
, "md%d", unit
);
1896 sprintf(disk
->devfs_name
, "md/%d", unit
);
1898 disk
->fops
= &md_fops
;
1899 disk
->private_data
= mddev
;
1900 disk
->queue
= mddev
->queue
;
1902 mddev
->gendisk
= disk
;
1904 mddev
->kobj
.parent
= &disk
->kobj
;
1905 mddev
->kobj
.k_name
= NULL
;
1906 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
1907 mddev
->kobj
.ktype
= &md_ktype
;
1908 kobject_register(&mddev
->kobj
);
1912 void md_wakeup_thread(mdk_thread_t
*thread
);
1914 static void md_safemode_timeout(unsigned long data
)
1916 mddev_t
*mddev
= (mddev_t
*) data
;
1918 mddev
->safemode
= 1;
1919 md_wakeup_thread(mddev
->thread
);
1923 static int do_md_run(mddev_t
* mddev
)
1927 struct list_head
*tmp
;
1929 struct gendisk
*disk
;
1930 char b
[BDEVNAME_SIZE
];
1932 if (list_empty(&mddev
->disks
))
1933 /* cannot run an array with no devices.. */
1940 * Analyze all RAID superblock(s)
1942 if (!mddev
->raid_disks
)
1945 chunk_size
= mddev
->chunk_size
;
1946 pnum
= level_to_pers(mddev
->level
);
1948 if ((pnum
!= MULTIPATH
) && (pnum
!= RAID1
)) {
1951 * 'default chunksize' in the old md code used to
1952 * be PAGE_SIZE, baaad.
1953 * we abort here to be on the safe side. We don't
1954 * want to continue the bad practice.
1957 "no chunksize specified, see 'man raidtab'\n");
1960 if (chunk_size
> MAX_CHUNK_SIZE
) {
1961 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
1962 chunk_size
, MAX_CHUNK_SIZE
);
1966 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1968 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
1969 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
1972 if (chunk_size
< PAGE_SIZE
) {
1973 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
1974 chunk_size
, PAGE_SIZE
);
1978 /* devices must have minimum size of one chunk */
1979 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1980 if (test_bit(Faulty
, &rdev
->flags
))
1982 if (rdev
->size
< chunk_size
/ 1024) {
1984 "md: Dev %s smaller than chunk_size:"
1986 bdevname(rdev
->bdev
,b
),
1987 (unsigned long long)rdev
->size
,
1997 request_module("md-personality-%d", pnum
);
2002 * Drop all container device buffers, from now on
2003 * the only valid external interface is through the md
2005 * Also find largest hardsector size
2007 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2008 if (test_bit(Faulty
, &rdev
->flags
))
2010 sync_blockdev(rdev
->bdev
);
2011 invalidate_bdev(rdev
->bdev
, 0);
2014 md_probe(mddev
->unit
, NULL
, NULL
);
2015 disk
= mddev
->gendisk
;
2019 spin_lock(&pers_lock
);
2020 if (!pers
[pnum
] || !try_module_get(pers
[pnum
]->owner
)) {
2021 spin_unlock(&pers_lock
);
2022 printk(KERN_WARNING
"md: personality %d is not loaded!\n",
2027 mddev
->pers
= pers
[pnum
];
2028 spin_unlock(&pers_lock
);
2030 mddev
->recovery
= 0;
2031 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
2032 mddev
->barriers_work
= 1;
2035 mddev
->ro
= 2; /* read-only, but switch on first write */
2037 /* before we start the array running, initialise the bitmap */
2038 err
= bitmap_create(mddev
);
2040 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
2041 mdname(mddev
), err
);
2043 err
= mddev
->pers
->run(mddev
);
2045 printk(KERN_ERR
"md: pers->run() failed ...\n");
2046 module_put(mddev
->pers
->owner
);
2048 bitmap_destroy(mddev
);
2051 atomic_set(&mddev
->writes_pending
,0);
2052 mddev
->safemode
= 0;
2053 mddev
->safemode_timer
.function
= md_safemode_timeout
;
2054 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
2055 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
2058 ITERATE_RDEV(mddev
,rdev
,tmp
)
2059 if (rdev
->raid_disk
>= 0) {
2061 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2062 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
2065 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2066 md_wakeup_thread(mddev
->thread
);
2068 if (mddev
->sb_dirty
)
2069 md_update_sb(mddev
);
2071 set_capacity(disk
, mddev
->array_size
<<1);
2073 /* If we call blk_queue_make_request here, it will
2074 * re-initialise max_sectors etc which may have been
2075 * refined inside -> run. So just set the bits we need to set.
2076 * Most initialisation happended when we called
2077 * blk_queue_make_request(..., md_fail_request)
2080 mddev
->queue
->queuedata
= mddev
;
2081 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
2087 static int restart_array(mddev_t
*mddev
)
2089 struct gendisk
*disk
= mddev
->gendisk
;
2093 * Complain if it has no devices
2096 if (list_empty(&mddev
->disks
))
2104 mddev
->safemode
= 0;
2106 set_disk_ro(disk
, 0);
2108 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
2111 * Kick recovery or resync if necessary
2113 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2114 md_wakeup_thread(mddev
->thread
);
2117 printk(KERN_ERR
"md: %s has no personality assigned.\n",
2126 static int do_md_stop(mddev_t
* mddev
, int ro
)
2129 struct gendisk
*disk
= mddev
->gendisk
;
2132 if (atomic_read(&mddev
->active
)>2) {
2133 printk("md: %s still in use.\n",mdname(mddev
));
2137 if (mddev
->sync_thread
) {
2138 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2139 md_unregister_thread(mddev
->sync_thread
);
2140 mddev
->sync_thread
= NULL
;
2143 del_timer_sync(&mddev
->safemode_timer
);
2145 invalidate_partition(disk
, 0);
2153 bitmap_flush(mddev
);
2154 md_super_wait(mddev
);
2156 set_disk_ro(disk
, 0);
2157 blk_queue_make_request(mddev
->queue
, md_fail_request
);
2158 mddev
->pers
->stop(mddev
);
2159 module_put(mddev
->pers
->owner
);
2164 if (!mddev
->in_sync
) {
2165 /* mark array as shutdown cleanly */
2167 md_update_sb(mddev
);
2170 set_disk_ro(disk
, 1);
2173 bitmap_destroy(mddev
);
2174 if (mddev
->bitmap_file
) {
2175 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
2176 fput(mddev
->bitmap_file
);
2177 mddev
->bitmap_file
= NULL
;
2179 mddev
->bitmap_offset
= 0;
2182 * Free resources if final stop
2186 struct list_head
*tmp
;
2187 struct gendisk
*disk
;
2188 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
2190 ITERATE_RDEV(mddev
,rdev
,tmp
)
2191 if (rdev
->raid_disk
>= 0) {
2193 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2194 sysfs_remove_link(&mddev
->kobj
, nm
);
2197 export_array(mddev
);
2199 mddev
->array_size
= 0;
2200 disk
= mddev
->gendisk
;
2202 set_capacity(disk
, 0);
2205 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
2212 static void autorun_array(mddev_t
*mddev
)
2215 struct list_head
*tmp
;
2218 if (list_empty(&mddev
->disks
))
2221 printk(KERN_INFO
"md: running: ");
2223 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2224 char b
[BDEVNAME_SIZE
];
2225 printk("<%s>", bdevname(rdev
->bdev
,b
));
2229 err
= do_md_run (mddev
);
2231 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
2232 do_md_stop (mddev
, 0);
2237 * lets try to run arrays based on all disks that have arrived
2238 * until now. (those are in pending_raid_disks)
2240 * the method: pick the first pending disk, collect all disks with
2241 * the same UUID, remove all from the pending list and put them into
2242 * the 'same_array' list. Then order this list based on superblock
2243 * update time (freshest comes first), kick out 'old' disks and
2244 * compare superblocks. If everything's fine then run it.
2246 * If "unit" is allocated, then bump its reference count
2248 static void autorun_devices(int part
)
2250 struct list_head candidates
;
2251 struct list_head
*tmp
;
2252 mdk_rdev_t
*rdev0
, *rdev
;
2254 char b
[BDEVNAME_SIZE
];
2256 printk(KERN_INFO
"md: autorun ...\n");
2257 while (!list_empty(&pending_raid_disks
)) {
2259 rdev0
= list_entry(pending_raid_disks
.next
,
2260 mdk_rdev_t
, same_set
);
2262 printk(KERN_INFO
"md: considering %s ...\n",
2263 bdevname(rdev0
->bdev
,b
));
2264 INIT_LIST_HEAD(&candidates
);
2265 ITERATE_RDEV_PENDING(rdev
,tmp
)
2266 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
2267 printk(KERN_INFO
"md: adding %s ...\n",
2268 bdevname(rdev
->bdev
,b
));
2269 list_move(&rdev
->same_set
, &candidates
);
2272 * now we have a set of devices, with all of them having
2273 * mostly sane superblocks. It's time to allocate the
2276 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
2277 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
2278 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
2282 dev
= MKDEV(mdp_major
,
2283 rdev0
->preferred_minor
<< MdpMinorShift
);
2285 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
2287 md_probe(dev
, NULL
, NULL
);
2288 mddev
= mddev_find(dev
);
2291 "md: cannot allocate memory for md drive.\n");
2294 if (mddev_lock(mddev
))
2295 printk(KERN_WARNING
"md: %s locked, cannot run\n",
2297 else if (mddev
->raid_disks
|| mddev
->major_version
2298 || !list_empty(&mddev
->disks
)) {
2300 "md: %s already running, cannot run %s\n",
2301 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
2302 mddev_unlock(mddev
);
2304 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
2305 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
2306 list_del_init(&rdev
->same_set
);
2307 if (bind_rdev_to_array(rdev
, mddev
))
2310 autorun_array(mddev
);
2311 mddev_unlock(mddev
);
2313 /* on success, candidates will be empty, on error
2316 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
2320 printk(KERN_INFO
"md: ... autorun DONE.\n");
2324 * import RAID devices based on one partition
2325 * if possible, the array gets run as well.
2328 static int autostart_array(dev_t startdev
)
2330 char b
[BDEVNAME_SIZE
];
2331 int err
= -EINVAL
, i
;
2332 mdp_super_t
*sb
= NULL
;
2333 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
2335 start_rdev
= md_import_device(startdev
, 0, 0);
2336 if (IS_ERR(start_rdev
))
2340 /* NOTE: this can only work for 0.90.0 superblocks */
2341 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
2342 if (sb
->major_version
!= 0 ||
2343 sb
->minor_version
!= 90 ) {
2344 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
2345 export_rdev(start_rdev
);
2349 if (test_bit(Faulty
, &start_rdev
->flags
)) {
2351 "md: can not autostart based on faulty %s!\n",
2352 bdevname(start_rdev
->bdev
,b
));
2353 export_rdev(start_rdev
);
2356 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
2358 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2359 mdp_disk_t
*desc
= sb
->disks
+ i
;
2360 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
2364 if (dev
== startdev
)
2366 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
2368 rdev
= md_import_device(dev
, 0, 0);
2372 list_add(&rdev
->same_set
, &pending_raid_disks
);
2376 * possibly return codes
2384 static int get_version(void __user
* arg
)
2388 ver
.major
= MD_MAJOR_VERSION
;
2389 ver
.minor
= MD_MINOR_VERSION
;
2390 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
2392 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
2398 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
2400 mdu_array_info_t info
;
2401 int nr
,working
,active
,failed
,spare
;
2403 struct list_head
*tmp
;
2405 nr
=working
=active
=failed
=spare
=0;
2406 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2408 if (test_bit(Faulty
, &rdev
->flags
))
2412 if (test_bit(In_sync
, &rdev
->flags
))
2419 info
.major_version
= mddev
->major_version
;
2420 info
.minor_version
= mddev
->minor_version
;
2421 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
2422 info
.ctime
= mddev
->ctime
;
2423 info
.level
= mddev
->level
;
2424 info
.size
= mddev
->size
;
2426 info
.raid_disks
= mddev
->raid_disks
;
2427 info
.md_minor
= mddev
->md_minor
;
2428 info
.not_persistent
= !mddev
->persistent
;
2430 info
.utime
= mddev
->utime
;
2433 info
.state
= (1<<MD_SB_CLEAN
);
2434 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2435 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
2436 info
.active_disks
= active
;
2437 info
.working_disks
= working
;
2438 info
.failed_disks
= failed
;
2439 info
.spare_disks
= spare
;
2441 info
.layout
= mddev
->layout
;
2442 info
.chunk_size
= mddev
->chunk_size
;
2444 if (copy_to_user(arg
, &info
, sizeof(info
)))
2450 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
2452 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
2453 char *ptr
, *buf
= NULL
;
2456 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
2460 /* bitmap disabled, zero the first byte and copy out */
2461 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
2462 file
->pathname
[0] = '\0';
2466 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
2470 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
2474 strcpy(file
->pathname
, ptr
);
2478 if (copy_to_user(arg
, file
, sizeof(*file
)))
2486 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
2488 mdu_disk_info_t info
;
2492 if (copy_from_user(&info
, arg
, sizeof(info
)))
2497 rdev
= find_rdev_nr(mddev
, nr
);
2499 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
2500 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
2501 info
.raid_disk
= rdev
->raid_disk
;
2503 if (test_bit(Faulty
, &rdev
->flags
))
2504 info
.state
|= (1<<MD_DISK_FAULTY
);
2505 else if (test_bit(In_sync
, &rdev
->flags
)) {
2506 info
.state
|= (1<<MD_DISK_ACTIVE
);
2507 info
.state
|= (1<<MD_DISK_SYNC
);
2509 if (test_bit(WriteMostly
, &rdev
->flags
))
2510 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
2512 info
.major
= info
.minor
= 0;
2513 info
.raid_disk
= -1;
2514 info
.state
= (1<<MD_DISK_REMOVED
);
2517 if (copy_to_user(arg
, &info
, sizeof(info
)))
2523 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
2525 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
2527 dev_t dev
= MKDEV(info
->major
,info
->minor
);
2529 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
2532 if (!mddev
->raid_disks
) {
2534 /* expecting a device which has a superblock */
2535 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
2538 "md: md_import_device returned %ld\n",
2540 return PTR_ERR(rdev
);
2542 if (!list_empty(&mddev
->disks
)) {
2543 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2544 mdk_rdev_t
, same_set
);
2545 int err
= super_types
[mddev
->major_version
]
2546 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2549 "md: %s has different UUID to %s\n",
2550 bdevname(rdev
->bdev
,b
),
2551 bdevname(rdev0
->bdev
,b2
));
2556 err
= bind_rdev_to_array(rdev
, mddev
);
2563 * add_new_disk can be used once the array is assembled
2564 * to add "hot spares". They must already have a superblock
2569 if (!mddev
->pers
->hot_add_disk
) {
2571 "%s: personality does not support diskops!\n",
2575 if (mddev
->persistent
)
2576 rdev
= md_import_device(dev
, mddev
->major_version
,
2577 mddev
->minor_version
);
2579 rdev
= md_import_device(dev
, -1, -1);
2582 "md: md_import_device returned %ld\n",
2584 return PTR_ERR(rdev
);
2586 /* set save_raid_disk if appropriate */
2587 if (!mddev
->persistent
) {
2588 if (info
->state
& (1<<MD_DISK_SYNC
) &&
2589 info
->raid_disk
< mddev
->raid_disks
)
2590 rdev
->raid_disk
= info
->raid_disk
;
2592 rdev
->raid_disk
= -1;
2594 super_types
[mddev
->major_version
].
2595 validate_super(mddev
, rdev
);
2596 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2598 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
2599 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2600 set_bit(WriteMostly
, &rdev
->flags
);
2602 rdev
->raid_disk
= -1;
2603 err
= bind_rdev_to_array(rdev
, mddev
);
2607 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2608 md_wakeup_thread(mddev
->thread
);
2612 /* otherwise, add_new_disk is only allowed
2613 * for major_version==0 superblocks
2615 if (mddev
->major_version
!= 0) {
2616 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
2621 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
2623 rdev
= md_import_device (dev
, -1, 0);
2626 "md: error, md_import_device() returned %ld\n",
2628 return PTR_ERR(rdev
);
2630 rdev
->desc_nr
= info
->number
;
2631 if (info
->raid_disk
< mddev
->raid_disks
)
2632 rdev
->raid_disk
= info
->raid_disk
;
2634 rdev
->raid_disk
= -1;
2638 if (rdev
->raid_disk
< mddev
->raid_disks
)
2639 if (info
->state
& (1<<MD_DISK_SYNC
))
2640 set_bit(In_sync
, &rdev
->flags
);
2642 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2643 set_bit(WriteMostly
, &rdev
->flags
);
2645 err
= bind_rdev_to_array(rdev
, mddev
);
2651 if (!mddev
->persistent
) {
2652 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
2653 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2655 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2656 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2658 if (!mddev
->size
|| (mddev
->size
> rdev
->size
))
2659 mddev
->size
= rdev
->size
;
2665 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
2667 char b
[BDEVNAME_SIZE
];
2673 rdev
= find_rdev(mddev
, dev
);
2677 if (rdev
->raid_disk
>= 0)
2680 kick_rdev_from_array(rdev
);
2681 md_update_sb(mddev
);
2685 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
2686 bdevname(rdev
->bdev
,b
), mdname(mddev
));
2690 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
2692 char b
[BDEVNAME_SIZE
];
2700 if (mddev
->major_version
!= 0) {
2701 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
2702 " version-0 superblocks.\n",
2706 if (!mddev
->pers
->hot_add_disk
) {
2708 "%s: personality does not support diskops!\n",
2713 rdev
= md_import_device (dev
, -1, 0);
2716 "md: error, md_import_device() returned %ld\n",
2721 if (mddev
->persistent
)
2722 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2725 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2727 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2730 if (size
< mddev
->size
) {
2732 "%s: disk size %llu blocks < array size %llu\n",
2733 mdname(mddev
), (unsigned long long)size
,
2734 (unsigned long long)mddev
->size
);
2739 if (test_bit(Faulty
, &rdev
->flags
)) {
2741 "md: can not hot-add faulty %s disk to %s!\n",
2742 bdevname(rdev
->bdev
,b
), mdname(mddev
));
2746 clear_bit(In_sync
, &rdev
->flags
);
2748 bind_rdev_to_array(rdev
, mddev
);
2751 * The rest should better be atomic, we can have disk failures
2752 * noticed in interrupt contexts ...
2755 if (rdev
->desc_nr
== mddev
->max_disks
) {
2756 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
2759 goto abort_unbind_export
;
2762 rdev
->raid_disk
= -1;
2764 md_update_sb(mddev
);
2767 * Kick recovery, maybe this spare has to be added to the
2768 * array immediately.
2770 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2771 md_wakeup_thread(mddev
->thread
);
2775 abort_unbind_export
:
2776 unbind_rdev_from_array(rdev
);
2783 /* similar to deny_write_access, but accounts for our holding a reference
2784 * to the file ourselves */
2785 static int deny_bitmap_write_access(struct file
* file
)
2787 struct inode
*inode
= file
->f_mapping
->host
;
2789 spin_lock(&inode
->i_lock
);
2790 if (atomic_read(&inode
->i_writecount
) > 1) {
2791 spin_unlock(&inode
->i_lock
);
2794 atomic_set(&inode
->i_writecount
, -1);
2795 spin_unlock(&inode
->i_lock
);
2800 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
2805 if (!mddev
->pers
->quiesce
)
2807 if (mddev
->recovery
|| mddev
->sync_thread
)
2809 /* we should be able to change the bitmap.. */
2815 return -EEXIST
; /* cannot add when bitmap is present */
2816 mddev
->bitmap_file
= fget(fd
);
2818 if (mddev
->bitmap_file
== NULL
) {
2819 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
2824 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
2826 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
2828 fput(mddev
->bitmap_file
);
2829 mddev
->bitmap_file
= NULL
;
2832 mddev
->bitmap_offset
= 0; /* file overrides offset */
2833 } else if (mddev
->bitmap
== NULL
)
2834 return -ENOENT
; /* cannot remove what isn't there */
2837 mddev
->pers
->quiesce(mddev
, 1);
2839 err
= bitmap_create(mddev
);
2841 bitmap_destroy(mddev
);
2842 mddev
->pers
->quiesce(mddev
, 0);
2843 } else if (fd
< 0) {
2844 if (mddev
->bitmap_file
)
2845 fput(mddev
->bitmap_file
);
2846 mddev
->bitmap_file
= NULL
;
2853 * set_array_info is used two different ways
2854 * The original usage is when creating a new array.
2855 * In this usage, raid_disks is > 0 and it together with
2856 * level, size, not_persistent,layout,chunksize determine the
2857 * shape of the array.
2858 * This will always create an array with a type-0.90.0 superblock.
2859 * The newer usage is when assembling an array.
2860 * In this case raid_disks will be 0, and the major_version field is
2861 * use to determine which style super-blocks are to be found on the devices.
2862 * The minor and patch _version numbers are also kept incase the
2863 * super_block handler wishes to interpret them.
2865 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
2868 if (info
->raid_disks
== 0) {
2869 /* just setting version number for superblock loading */
2870 if (info
->major_version
< 0 ||
2871 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2872 super_types
[info
->major_version
].name
== NULL
) {
2873 /* maybe try to auto-load a module? */
2875 "md: superblock version %d not known\n",
2876 info
->major_version
);
2879 mddev
->major_version
= info
->major_version
;
2880 mddev
->minor_version
= info
->minor_version
;
2881 mddev
->patch_version
= info
->patch_version
;
2884 mddev
->major_version
= MD_MAJOR_VERSION
;
2885 mddev
->minor_version
= MD_MINOR_VERSION
;
2886 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
2887 mddev
->ctime
= get_seconds();
2889 mddev
->level
= info
->level
;
2890 mddev
->size
= info
->size
;
2891 mddev
->raid_disks
= info
->raid_disks
;
2892 /* don't set md_minor, it is determined by which /dev/md* was
2895 if (info
->state
& (1<<MD_SB_CLEAN
))
2896 mddev
->recovery_cp
= MaxSector
;
2898 mddev
->recovery_cp
= 0;
2899 mddev
->persistent
= ! info
->not_persistent
;
2901 mddev
->layout
= info
->layout
;
2902 mddev
->chunk_size
= info
->chunk_size
;
2904 mddev
->max_disks
= MD_SB_DISKS
;
2906 mddev
->sb_dirty
= 1;
2909 * Generate a 128 bit UUID
2911 get_random_bytes(mddev
->uuid
, 16);
2917 * update_array_info is used to change the configuration of an
2919 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2920 * fields in the info are checked against the array.
2921 * Any differences that cannot be handled will cause an error.
2922 * Normally, only one change can be managed at a time.
2924 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
2930 /* calculate expected state,ignoring low bits */
2931 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2932 state
|= (1 << MD_SB_BITMAP_PRESENT
);
2934 if (mddev
->major_version
!= info
->major_version
||
2935 mddev
->minor_version
!= info
->minor_version
||
2936 /* mddev->patch_version != info->patch_version || */
2937 mddev
->ctime
!= info
->ctime
||
2938 mddev
->level
!= info
->level
||
2939 /* mddev->layout != info->layout || */
2940 !mddev
->persistent
!= info
->not_persistent
||
2941 mddev
->chunk_size
!= info
->chunk_size
||
2942 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2943 ((state
^info
->state
) & 0xfffffe00)
2946 /* Check there is only one change */
2947 if (mddev
->size
!= info
->size
) cnt
++;
2948 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
2949 if (mddev
->layout
!= info
->layout
) cnt
++;
2950 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
2951 if (cnt
== 0) return 0;
2952 if (cnt
> 1) return -EINVAL
;
2954 if (mddev
->layout
!= info
->layout
) {
2956 * we don't need to do anything at the md level, the
2957 * personality will take care of it all.
2959 if (mddev
->pers
->reconfig
== NULL
)
2962 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
2964 if (mddev
->size
!= info
->size
) {
2966 struct list_head
*tmp
;
2967 if (mddev
->pers
->resize
== NULL
)
2969 /* The "size" is the amount of each device that is used.
2970 * This can only make sense for arrays with redundancy.
2971 * linear and raid0 always use whatever space is available
2972 * We can only consider changing the size if no resync
2973 * or reconstruction is happening, and if the new size
2974 * is acceptable. It must fit before the sb_offset or,
2975 * if that is <data_offset, it must fit before the
2976 * size of each device.
2977 * If size is zero, we find the largest size that fits.
2979 if (mddev
->sync_thread
)
2981 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2983 int fit
= (info
->size
== 0);
2984 if (rdev
->sb_offset
> rdev
->data_offset
)
2985 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
2987 avail
= get_capacity(rdev
->bdev
->bd_disk
)
2988 - rdev
->data_offset
;
2989 if (fit
&& (info
->size
== 0 || info
->size
> avail
/2))
2990 info
->size
= avail
/2;
2991 if (avail
< ((sector_t
)info
->size
<< 1))
2994 rv
= mddev
->pers
->resize(mddev
, (sector_t
)info
->size
*2);
2996 struct block_device
*bdev
;
2998 bdev
= bdget_disk(mddev
->gendisk
, 0);
3000 down(&bdev
->bd_inode
->i_sem
);
3001 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
3002 up(&bdev
->bd_inode
->i_sem
);
3007 if (mddev
->raid_disks
!= info
->raid_disks
) {
3008 /* change the number of raid disks */
3009 if (mddev
->pers
->reshape
== NULL
)
3011 if (info
->raid_disks
<= 0 ||
3012 info
->raid_disks
>= mddev
->max_disks
)
3014 if (mddev
->sync_thread
)
3016 rv
= mddev
->pers
->reshape(mddev
, info
->raid_disks
);
3018 struct block_device
*bdev
;
3020 bdev
= bdget_disk(mddev
->gendisk
, 0);
3022 down(&bdev
->bd_inode
->i_sem
);
3023 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
3024 up(&bdev
->bd_inode
->i_sem
);
3029 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
3030 if (mddev
->pers
->quiesce
== NULL
)
3032 if (mddev
->recovery
|| mddev
->sync_thread
)
3034 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
3035 /* add the bitmap */
3038 if (mddev
->default_bitmap_offset
== 0)
3040 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
3041 mddev
->pers
->quiesce(mddev
, 1);
3042 rv
= bitmap_create(mddev
);
3044 bitmap_destroy(mddev
);
3045 mddev
->pers
->quiesce(mddev
, 0);
3047 /* remove the bitmap */
3050 if (mddev
->bitmap
->file
)
3052 mddev
->pers
->quiesce(mddev
, 1);
3053 bitmap_destroy(mddev
);
3054 mddev
->pers
->quiesce(mddev
, 0);
3055 mddev
->bitmap_offset
= 0;
3058 md_update_sb(mddev
);
3062 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
3066 if (mddev
->pers
== NULL
)
3069 rdev
= find_rdev(mddev
, dev
);
3073 md_error(mddev
, rdev
);
3077 static int md_ioctl(struct inode
*inode
, struct file
*file
,
3078 unsigned int cmd
, unsigned long arg
)
3081 void __user
*argp
= (void __user
*)arg
;
3082 struct hd_geometry __user
*loc
= argp
;
3083 mddev_t
*mddev
= NULL
;
3085 if (!capable(CAP_SYS_ADMIN
))
3089 * Commands dealing with the RAID driver but not any
3095 err
= get_version(argp
);
3098 case PRINT_RAID_DEBUG
:
3106 autostart_arrays(arg
);
3113 * Commands creating/starting a new array:
3116 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3124 if (cmd
== START_ARRAY
) {
3125 /* START_ARRAY doesn't need to lock the array as autostart_array
3126 * does the locking, and it could even be a different array
3131 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3132 "This will not be supported beyond 2.6\n",
3133 current
->comm
, current
->pid
);
3136 err
= autostart_array(new_decode_dev(arg
));
3138 printk(KERN_WARNING
"md: autostart failed!\n");
3144 err
= mddev_lock(mddev
);
3147 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3154 case SET_ARRAY_INFO
:
3156 mdu_array_info_t info
;
3158 memset(&info
, 0, sizeof(info
));
3159 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
3164 err
= update_array_info(mddev
, &info
);
3166 printk(KERN_WARNING
"md: couldn't update"
3167 " array info. %d\n", err
);
3172 if (!list_empty(&mddev
->disks
)) {
3174 "md: array %s already has disks!\n",
3179 if (mddev
->raid_disks
) {
3181 "md: array %s already initialised!\n",
3186 err
= set_array_info(mddev
, &info
);
3188 printk(KERN_WARNING
"md: couldn't set"
3189 " array info. %d\n", err
);
3199 * Commands querying/configuring an existing array:
3201 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3202 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3203 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
3204 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
3210 * Commands even a read-only array can execute:
3214 case GET_ARRAY_INFO
:
3215 err
= get_array_info(mddev
, argp
);
3218 case GET_BITMAP_FILE
:
3219 err
= get_bitmap_file(mddev
, argp
);
3223 err
= get_disk_info(mddev
, argp
);
3226 case RESTART_ARRAY_RW
:
3227 err
= restart_array(mddev
);
3231 err
= do_md_stop (mddev
, 0);
3235 err
= do_md_stop (mddev
, 1);
3239 * We have a problem here : there is no easy way to give a CHS
3240 * virtual geometry. We currently pretend that we have a 2 heads
3241 * 4 sectors (with a BIG number of cylinders...). This drives
3242 * dosfs just mad... ;-)
3249 err
= put_user (2, (char __user
*) &loc
->heads
);
3252 err
= put_user (4, (char __user
*) &loc
->sectors
);
3255 err
= put_user(get_capacity(mddev
->gendisk
)/8,
3256 (short __user
*) &loc
->cylinders
);
3259 err
= put_user (get_start_sect(inode
->i_bdev
),
3260 (long __user
*) &loc
->start
);
3265 * The remaining ioctls are changing the state of the
3266 * superblock, so we do not allow them on read-only arrays.
3267 * However non-MD ioctls (e.g. get-size) will still come through
3268 * here and hit the 'default' below, so only disallow
3269 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3271 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
3272 mddev
->ro
&& mddev
->pers
) {
3273 if (mddev
->ro
== 2) {
3275 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3276 md_wakeup_thread(mddev
->thread
);
3288 mdu_disk_info_t info
;
3289 if (copy_from_user(&info
, argp
, sizeof(info
)))
3292 err
= add_new_disk(mddev
, &info
);
3296 case HOT_REMOVE_DISK
:
3297 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
3301 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
3304 case SET_DISK_FAULTY
:
3305 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
3309 err
= do_md_run (mddev
);
3312 case SET_BITMAP_FILE
:
3313 err
= set_bitmap_file(mddev
, (int)arg
);
3317 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
3318 printk(KERN_WARNING
"md: %s(pid %d) used"
3319 " obsolete MD ioctl, upgrade your"
3320 " software to use new ictls.\n",
3321 current
->comm
, current
->pid
);
3328 mddev_unlock(mddev
);
3338 static int md_open(struct inode
*inode
, struct file
*file
)
3341 * Succeed if we can lock the mddev, which confirms that
3342 * it isn't being stopped right now.
3344 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3347 if ((err
= mddev_lock(mddev
)))
3352 mddev_unlock(mddev
);
3354 check_disk_change(inode
->i_bdev
);
3359 static int md_release(struct inode
*inode
, struct file
* file
)
3361 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3370 static int md_media_changed(struct gendisk
*disk
)
3372 mddev_t
*mddev
= disk
->private_data
;
3374 return mddev
->changed
;
3377 static int md_revalidate(struct gendisk
*disk
)
3379 mddev_t
*mddev
= disk
->private_data
;
3384 static struct block_device_operations md_fops
=
3386 .owner
= THIS_MODULE
,
3388 .release
= md_release
,
3390 .media_changed
= md_media_changed
,
3391 .revalidate_disk
= md_revalidate
,
3394 static int md_thread(void * arg
)
3396 mdk_thread_t
*thread
= arg
;
3399 * md_thread is a 'system-thread', it's priority should be very
3400 * high. We avoid resource deadlocks individually in each
3401 * raid personality. (RAID5 does preallocation) We also use RR and
3402 * the very same RT priority as kswapd, thus we will never get
3403 * into a priority inversion deadlock.
3405 * we definitely have to have equal or higher priority than
3406 * bdflush, otherwise bdflush will deadlock if there are too
3407 * many dirty RAID5 blocks.
3410 allow_signal(SIGKILL
);
3411 complete(thread
->event
);
3412 while (!kthread_should_stop()) {
3413 void (*run
)(mddev_t
*);
3415 wait_event_interruptible_timeout(thread
->wqueue
,
3416 test_bit(THREAD_WAKEUP
, &thread
->flags
)
3417 || kthread_should_stop(),
3421 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
3431 void md_wakeup_thread(mdk_thread_t
*thread
)
3434 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
3435 set_bit(THREAD_WAKEUP
, &thread
->flags
);
3436 wake_up(&thread
->wqueue
);
3440 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
3443 mdk_thread_t
*thread
;
3444 struct completion event
;
3446 thread
= kmalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
3450 memset(thread
, 0, sizeof(mdk_thread_t
));
3451 init_waitqueue_head(&thread
->wqueue
);
3453 init_completion(&event
);
3454 thread
->event
= &event
;
3456 thread
->mddev
= mddev
;
3457 thread
->name
= name
;
3458 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
3459 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
3460 if (IS_ERR(thread
->tsk
)) {
3464 wait_for_completion(&event
);
3468 void md_unregister_thread(mdk_thread_t
*thread
)
3470 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
3472 kthread_stop(thread
->tsk
);
3476 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
3483 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
3486 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3488 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3489 __builtin_return_address(0),__builtin_return_address(1),
3490 __builtin_return_address(2),__builtin_return_address(3));
3492 if (!mddev
->pers
->error_handler
)
3494 mddev
->pers
->error_handler(mddev
,rdev
);
3495 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3496 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3497 md_wakeup_thread(mddev
->thread
);
3500 /* seq_file implementation /proc/mdstat */
3502 static void status_unused(struct seq_file
*seq
)
3506 struct list_head
*tmp
;
3508 seq_printf(seq
, "unused devices: ");
3510 ITERATE_RDEV_PENDING(rdev
,tmp
) {
3511 char b
[BDEVNAME_SIZE
];
3513 seq_printf(seq
, "%s ",
3514 bdevname(rdev
->bdev
,b
));
3517 seq_printf(seq
, "<none>");
3519 seq_printf(seq
, "\n");
3523 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
3525 unsigned long max_blocks
, resync
, res
, dt
, db
, rt
;
3527 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
3529 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3530 max_blocks
= mddev
->resync_max_sectors
>> 1;
3532 max_blocks
= mddev
->size
;
3535 * Should not happen.
3541 res
= (resync
/1024)*1000/(max_blocks
/1024 + 1);
3543 int i
, x
= res
/50, y
= 20-x
;
3544 seq_printf(seq
, "[");
3545 for (i
= 0; i
< x
; i
++)
3546 seq_printf(seq
, "=");
3547 seq_printf(seq
, ">");
3548 for (i
= 0; i
< y
; i
++)
3549 seq_printf(seq
, ".");
3550 seq_printf(seq
, "] ");
3552 seq_printf(seq
, " %s =%3lu.%lu%% (%lu/%lu)",
3553 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
3554 "resync" : "recovery"),
3555 res
/10, res
% 10, resync
, max_blocks
);
3558 * We do not want to overflow, so the order of operands and
3559 * the * 100 / 100 trick are important. We do a +1 to be
3560 * safe against division by zero. We only estimate anyway.
3562 * dt: time from mark until now
3563 * db: blocks written from mark until now
3564 * rt: remaining time
3566 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
3568 db
= resync
- (mddev
->resync_mark_cnt
/2);
3569 rt
= (dt
* ((max_blocks
-resync
) / (db
/100+1)))/100;
3571 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
3573 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
3576 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3578 struct list_head
*tmp
;
3588 spin_lock(&all_mddevs_lock
);
3589 list_for_each(tmp
,&all_mddevs
)
3591 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
3593 spin_unlock(&all_mddevs_lock
);
3596 spin_unlock(&all_mddevs_lock
);
3598 return (void*)2;/* tail */
3602 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3604 struct list_head
*tmp
;
3605 mddev_t
*next_mddev
, *mddev
= v
;
3611 spin_lock(&all_mddevs_lock
);
3613 tmp
= all_mddevs
.next
;
3615 tmp
= mddev
->all_mddevs
.next
;
3616 if (tmp
!= &all_mddevs
)
3617 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
3619 next_mddev
= (void*)2;
3622 spin_unlock(&all_mddevs_lock
);
3630 static void md_seq_stop(struct seq_file
*seq
, void *v
)
3634 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
3638 static int md_seq_show(struct seq_file
*seq
, void *v
)
3642 struct list_head
*tmp2
;
3645 struct bitmap
*bitmap
;
3647 if (v
== (void*)1) {
3648 seq_printf(seq
, "Personalities : ");
3649 spin_lock(&pers_lock
);
3650 for (i
= 0; i
< MAX_PERSONALITY
; i
++)
3652 seq_printf(seq
, "[%s] ", pers
[i
]->name
);
3654 spin_unlock(&pers_lock
);
3655 seq_printf(seq
, "\n");
3658 if (v
== (void*)2) {
3663 if (mddev_lock(mddev
)!=0)
3665 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
3666 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
3667 mddev
->pers
? "" : "in");
3670 seq_printf(seq
, " (read-only)");
3672 seq_printf(seq
, "(auto-read-only)");
3673 seq_printf(seq
, " %s", mddev
->pers
->name
);
3677 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
3678 char b
[BDEVNAME_SIZE
];
3679 seq_printf(seq
, " %s[%d]",
3680 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
3681 if (test_bit(WriteMostly
, &rdev
->flags
))
3682 seq_printf(seq
, "(W)");
3683 if (test_bit(Faulty
, &rdev
->flags
)) {
3684 seq_printf(seq
, "(F)");
3686 } else if (rdev
->raid_disk
< 0)
3687 seq_printf(seq
, "(S)"); /* spare */
3691 if (!list_empty(&mddev
->disks
)) {
3693 seq_printf(seq
, "\n %llu blocks",
3694 (unsigned long long)mddev
->array_size
);
3696 seq_printf(seq
, "\n %llu blocks",
3697 (unsigned long long)size
);
3699 if (mddev
->persistent
) {
3700 if (mddev
->major_version
!= 0 ||
3701 mddev
->minor_version
!= 90) {
3702 seq_printf(seq
," super %d.%d",
3703 mddev
->major_version
,
3704 mddev
->minor_version
);
3707 seq_printf(seq
, " super non-persistent");
3710 mddev
->pers
->status (seq
, mddev
);
3711 seq_printf(seq
, "\n ");
3712 if (mddev
->curr_resync
> 2) {
3713 status_resync (seq
, mddev
);
3714 seq_printf(seq
, "\n ");
3715 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
3716 seq_printf(seq
, "\tresync=DELAYED\n ");
3717 else if (mddev
->recovery_cp
< MaxSector
)
3718 seq_printf(seq
, "\tresync=PENDING\n ");
3720 seq_printf(seq
, "\n ");
3722 if ((bitmap
= mddev
->bitmap
)) {
3723 unsigned long chunk_kb
;
3724 unsigned long flags
;
3725 spin_lock_irqsave(&bitmap
->lock
, flags
);
3726 chunk_kb
= bitmap
->chunksize
>> 10;
3727 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
3729 bitmap
->pages
- bitmap
->missing_pages
,
3731 (bitmap
->pages
- bitmap
->missing_pages
)
3732 << (PAGE_SHIFT
- 10),
3733 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
3734 chunk_kb
? "KB" : "B");
3736 seq_printf(seq
, ", file: ");
3737 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
3738 bitmap
->file
->f_dentry
," \t\n");
3741 seq_printf(seq
, "\n");
3742 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
3745 seq_printf(seq
, "\n");
3747 mddev_unlock(mddev
);
3752 static struct seq_operations md_seq_ops
= {
3753 .start
= md_seq_start
,
3754 .next
= md_seq_next
,
3755 .stop
= md_seq_stop
,
3756 .show
= md_seq_show
,
3759 static int md_seq_open(struct inode
*inode
, struct file
*file
)
3763 error
= seq_open(file
, &md_seq_ops
);
3767 static struct file_operations md_seq_fops
= {
3768 .open
= md_seq_open
,
3770 .llseek
= seq_lseek
,
3771 .release
= seq_release
,
3774 int register_md_personality(int pnum
, mdk_personality_t
*p
)
3776 if (pnum
>= MAX_PERSONALITY
) {
3778 "md: tried to install personality %s as nr %d, but max is %lu\n",
3779 p
->name
, pnum
, MAX_PERSONALITY
-1);
3783 spin_lock(&pers_lock
);
3785 spin_unlock(&pers_lock
);
3790 printk(KERN_INFO
"md: %s personality registered as nr %d\n", p
->name
, pnum
);
3791 spin_unlock(&pers_lock
);
3795 int unregister_md_personality(int pnum
)
3797 if (pnum
>= MAX_PERSONALITY
)
3800 printk(KERN_INFO
"md: %s personality unregistered\n", pers
[pnum
]->name
);
3801 spin_lock(&pers_lock
);
3803 spin_unlock(&pers_lock
);
3807 static int is_mddev_idle(mddev_t
*mddev
)
3810 struct list_head
*tmp
;
3812 unsigned long curr_events
;
3815 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3816 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
3817 curr_events
= disk_stat_read(disk
, sectors
[0]) +
3818 disk_stat_read(disk
, sectors
[1]) -
3819 atomic_read(&disk
->sync_io
);
3820 /* Allow some slack between valud of curr_events and last_events,
3821 * as there are some uninteresting races.
3822 * Note: the following is an unsigned comparison.
3824 if ((curr_events
- rdev
->last_events
+ 32) > 64) {
3825 rdev
->last_events
= curr_events
;
3832 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
3834 /* another "blocks" (512byte) blocks have been synced */
3835 atomic_sub(blocks
, &mddev
->recovery_active
);
3836 wake_up(&mddev
->recovery_wait
);
3838 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
3839 md_wakeup_thread(mddev
->thread
);
3840 // stop recovery, signal do_sync ....
3845 /* md_write_start(mddev, bi)
3846 * If we need to update some array metadata (e.g. 'active' flag
3847 * in superblock) before writing, schedule a superblock update
3848 * and wait for it to complete.
3850 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
3852 if (bio_data_dir(bi
) != WRITE
)
3855 BUG_ON(mddev
->ro
== 1);
3856 if (mddev
->ro
== 2) {
3857 /* need to switch to read/write */
3859 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3860 md_wakeup_thread(mddev
->thread
);
3862 atomic_inc(&mddev
->writes_pending
);
3863 if (mddev
->in_sync
) {
3864 spin_lock_irq(&mddev
->write_lock
);
3865 if (mddev
->in_sync
) {
3867 mddev
->sb_dirty
= 1;
3868 md_wakeup_thread(mddev
->thread
);
3870 spin_unlock_irq(&mddev
->write_lock
);
3872 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
3875 void md_write_end(mddev_t
*mddev
)
3877 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
3878 if (mddev
->safemode
== 2)
3879 md_wakeup_thread(mddev
->thread
);
3881 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
3885 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
3887 #define SYNC_MARKS 10
3888 #define SYNC_MARK_STEP (3*HZ)
3889 static void md_do_sync(mddev_t
*mddev
)
3892 unsigned int currspeed
= 0,
3894 sector_t max_sectors
,j
, io_sectors
;
3895 unsigned long mark
[SYNC_MARKS
];
3896 sector_t mark_cnt
[SYNC_MARKS
];
3898 struct list_head
*tmp
;
3899 sector_t last_check
;
3902 /* just incase thread restarts... */
3903 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
3906 /* we overload curr_resync somewhat here.
3907 * 0 == not engaged in resync at all
3908 * 2 == checking that there is no conflict with another sync
3909 * 1 == like 2, but have yielded to allow conflicting resync to
3911 * other == active in resync - this many blocks
3913 * Before starting a resync we must have set curr_resync to
3914 * 2, and then checked that every "conflicting" array has curr_resync
3915 * less than ours. When we find one that is the same or higher
3916 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
3917 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
3918 * This will mean we have to start checking from the beginning again.
3923 mddev
->curr_resync
= 2;
3926 if (signal_pending(current
) ||
3927 kthread_should_stop()) {
3928 flush_signals(current
);
3929 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3932 ITERATE_MDDEV(mddev2
,tmp
) {
3933 if (mddev2
== mddev
)
3935 if (mddev2
->curr_resync
&&
3936 match_mddev_units(mddev
,mddev2
)) {
3938 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
3939 /* arbitrarily yield */
3940 mddev
->curr_resync
= 1;
3941 wake_up(&resync_wait
);
3943 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
3944 /* no need to wait here, we can wait the next
3945 * time 'round when curr_resync == 2
3948 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
3949 if (!signal_pending(current
) &&
3950 !kthread_should_stop() &&
3951 mddev2
->curr_resync
>= mddev
->curr_resync
) {
3952 printk(KERN_INFO
"md: delaying resync of %s"
3953 " until %s has finished resync (they"
3954 " share one or more physical units)\n",
3955 mdname(mddev
), mdname(mddev2
));
3958 finish_wait(&resync_wait
, &wq
);
3961 finish_wait(&resync_wait
, &wq
);
3964 } while (mddev
->curr_resync
< 2);
3966 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3967 /* resync follows the size requested by the personality,
3968 * which defaults to physical size, but can be virtual size
3970 max_sectors
= mddev
->resync_max_sectors
;
3971 mddev
->resync_mismatches
= 0;
3973 /* recovery follows the physical size of devices */
3974 max_sectors
= mddev
->size
<< 1;
3976 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
3977 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
3978 " %d KB/sec/disc.\n", sysctl_speed_limit_min
);
3979 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
3980 "(but not more than %d KB/sec) for reconstruction.\n",
3981 sysctl_speed_limit_max
);
3983 is_mddev_idle(mddev
); /* this also initializes IO event counters */
3984 /* we don't use the checkpoint if there's a bitmap */
3985 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
3986 && ! test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3987 j
= mddev
->recovery_cp
;
3991 for (m
= 0; m
< SYNC_MARKS
; m
++) {
3993 mark_cnt
[m
] = io_sectors
;
3996 mddev
->resync_mark
= mark
[last_mark
];
3997 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
4000 * Tune reconstruction:
4002 window
= 32*(PAGE_SIZE
/512);
4003 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
4004 window
/2,(unsigned long long) max_sectors
/2);
4006 atomic_set(&mddev
->recovery_active
, 0);
4007 init_waitqueue_head(&mddev
->recovery_wait
);
4012 "md: resuming recovery of %s from checkpoint.\n",
4014 mddev
->curr_resync
= j
;
4017 while (j
< max_sectors
) {
4021 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
4022 currspeed
< sysctl_speed_limit_min
);
4024 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4028 if (!skipped
) { /* actual IO requested */
4029 io_sectors
+= sectors
;
4030 atomic_add(sectors
, &mddev
->recovery_active
);
4034 if (j
>1) mddev
->curr_resync
= j
;
4037 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
4040 last_check
= io_sectors
;
4042 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
4043 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
4047 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
4049 int next
= (last_mark
+1) % SYNC_MARKS
;
4051 mddev
->resync_mark
= mark
[next
];
4052 mddev
->resync_mark_cnt
= mark_cnt
[next
];
4053 mark
[next
] = jiffies
;
4054 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
4059 if (signal_pending(current
) || kthread_should_stop()) {
4061 * got a signal, exit.
4064 "md: md_do_sync() got signal ... exiting\n");
4065 flush_signals(current
);
4066 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4071 * this loop exits only if either when we are slower than
4072 * the 'hard' speed limit, or the system was IO-idle for
4074 * the system might be non-idle CPU-wise, but we only care
4075 * about not overloading the IO subsystem. (things like an
4076 * e2fsck being done on the RAID array should execute fast)
4078 mddev
->queue
->unplug_fn(mddev
->queue
);
4081 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
4082 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
4084 if (currspeed
> sysctl_speed_limit_min
) {
4085 if ((currspeed
> sysctl_speed_limit_max
) ||
4086 !is_mddev_idle(mddev
)) {
4087 msleep_interruptible(250);
4092 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
4094 * this also signals 'finished resyncing' to md_stop
4097 mddev
->queue
->unplug_fn(mddev
->queue
);
4099 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
4101 /* tell personality that we are finished */
4102 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
4104 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4105 mddev
->curr_resync
> 2 &&
4106 mddev
->curr_resync
>= mddev
->recovery_cp
) {
4107 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4109 "md: checkpointing recovery of %s.\n",
4111 mddev
->recovery_cp
= mddev
->curr_resync
;
4113 mddev
->recovery_cp
= MaxSector
;
4117 mddev
->curr_resync
= 0;
4118 wake_up(&resync_wait
);
4119 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4120 md_wakeup_thread(mddev
->thread
);
4125 * This routine is regularly called by all per-raid-array threads to
4126 * deal with generic issues like resync and super-block update.
4127 * Raid personalities that don't have a thread (linear/raid0) do not
4128 * need this as they never do any recovery or update the superblock.
4130 * It does not do any resync itself, but rather "forks" off other threads
4131 * to do that as needed.
4132 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4133 * "->recovery" and create a thread at ->sync_thread.
4134 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4135 * and wakeups up this thread which will reap the thread and finish up.
4136 * This thread also removes any faulty devices (with nr_pending == 0).
4138 * The overall approach is:
4139 * 1/ if the superblock needs updating, update it.
4140 * 2/ If a recovery thread is running, don't do anything else.
4141 * 3/ If recovery has finished, clean up, possibly marking spares active.
4142 * 4/ If there are any faulty devices, remove them.
4143 * 5/ If array is degraded, try to add spares devices
4144 * 6/ If array has spares or is not in-sync, start a resync thread.
4146 void md_check_recovery(mddev_t
*mddev
)
4149 struct list_head
*rtmp
;
4153 bitmap_daemon_work(mddev
->bitmap
);
4158 if (signal_pending(current
)) {
4159 if (mddev
->pers
->sync_request
) {
4160 printk(KERN_INFO
"md: %s in immediate safe mode\n",
4162 mddev
->safemode
= 2;
4164 flush_signals(current
);
4169 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
4170 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
4171 (mddev
->safemode
== 1) ||
4172 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
4173 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
4177 if (mddev_trylock(mddev
)==0) {
4180 spin_lock_irq(&mddev
->write_lock
);
4181 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
4182 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
4184 mddev
->sb_dirty
= 1;
4186 if (mddev
->safemode
== 1)
4187 mddev
->safemode
= 0;
4188 spin_unlock_irq(&mddev
->write_lock
);
4190 if (mddev
->sb_dirty
)
4191 md_update_sb(mddev
);
4194 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4195 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
4196 /* resync/recovery still happening */
4197 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4200 if (mddev
->sync_thread
) {
4201 /* resync has finished, collect result */
4202 md_unregister_thread(mddev
->sync_thread
);
4203 mddev
->sync_thread
= NULL
;
4204 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4205 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4207 /* activate any spares */
4208 mddev
->pers
->spare_active(mddev
);
4210 md_update_sb(mddev
);
4212 /* if array is no-longer degraded, then any saved_raid_disk
4213 * information must be scrapped
4215 if (!mddev
->degraded
)
4216 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4217 rdev
->saved_raid_disk
= -1;
4219 mddev
->recovery
= 0;
4220 /* flag recovery needed just to double check */
4221 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4224 /* Clear some bits that don't mean anything, but
4227 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4228 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4229 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4230 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4232 /* no recovery is running.
4233 * remove any failed drives, then
4234 * add spares if possible.
4235 * Spare are also removed and re-added, to allow
4236 * the personality to fail the re-add.
4238 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4239 if (rdev
->raid_disk
>= 0 &&
4240 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
4241 atomic_read(&rdev
->nr_pending
)==0) {
4242 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
4244 sprintf(nm
,"rd%d", rdev
->raid_disk
);
4245 sysfs_remove_link(&mddev
->kobj
, nm
);
4246 rdev
->raid_disk
= -1;
4250 if (mddev
->degraded
) {
4251 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4252 if (rdev
->raid_disk
< 0
4253 && !test_bit(Faulty
, &rdev
->flags
)) {
4254 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
4256 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4257 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
4265 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4266 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4267 } else if (mddev
->recovery_cp
< MaxSector
) {
4268 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4269 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4270 /* nothing to be done ... */
4273 if (mddev
->pers
->sync_request
) {
4274 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4275 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
4276 /* We are adding a device or devices to an array
4277 * which has the bitmap stored on all devices.
4278 * So make sure all bitmap pages get written
4280 bitmap_write_all(mddev
->bitmap
);
4282 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4285 if (!mddev
->sync_thread
) {
4286 printk(KERN_ERR
"%s: could not start resync"
4289 /* leave the spares where they are, it shouldn't hurt */
4290 mddev
->recovery
= 0;
4292 md_wakeup_thread(mddev
->sync_thread
);
4296 mddev_unlock(mddev
);
4300 static int md_notify_reboot(struct notifier_block
*this,
4301 unsigned long code
, void *x
)
4303 struct list_head
*tmp
;
4306 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
4308 printk(KERN_INFO
"md: stopping all md devices.\n");
4310 ITERATE_MDDEV(mddev
,tmp
)
4311 if (mddev_trylock(mddev
)==0)
4312 do_md_stop (mddev
, 1);
4314 * certain more exotic SCSI devices are known to be
4315 * volatile wrt too early system reboots. While the
4316 * right place to handle this issue is the given
4317 * driver, we do want to have a safe RAID driver ...
4324 static struct notifier_block md_notifier
= {
4325 .notifier_call
= md_notify_reboot
,
4327 .priority
= INT_MAX
, /* before any real devices */
4330 static void md_geninit(void)
4332 struct proc_dir_entry
*p
;
4334 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
4336 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
4338 p
->proc_fops
= &md_seq_fops
;
4341 static int __init
md_init(void)
4345 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4346 " MD_SB_DISKS=%d\n",
4347 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
4348 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
4349 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
4352 if (register_blkdev(MAJOR_NR
, "md"))
4354 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
4355 unregister_blkdev(MAJOR_NR
, "md");
4359 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
4360 md_probe
, NULL
, NULL
);
4361 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
4362 md_probe
, NULL
, NULL
);
4364 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4365 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
4366 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4369 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4370 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
4371 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4375 register_reboot_notifier(&md_notifier
);
4376 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
4386 * Searches all registered partitions for autorun RAID arrays
4389 static dev_t detected_devices
[128];
4392 void md_autodetect_dev(dev_t dev
)
4394 if (dev_cnt
>= 0 && dev_cnt
< 127)
4395 detected_devices
[dev_cnt
++] = dev
;
4399 static void autostart_arrays(int part
)
4404 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
4406 for (i
= 0; i
< dev_cnt
; i
++) {
4407 dev_t dev
= detected_devices
[i
];
4409 rdev
= md_import_device(dev
,0, 0);
4413 if (test_bit(Faulty
, &rdev
->flags
)) {
4417 list_add(&rdev
->same_set
, &pending_raid_disks
);
4421 autorun_devices(part
);
4426 static __exit
void md_exit(void)
4429 struct list_head
*tmp
;
4431 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
4432 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
4433 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4434 devfs_remove("md/%d", i
);
4435 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4436 devfs_remove("md/d%d", i
);
4440 unregister_blkdev(MAJOR_NR
,"md");
4441 unregister_blkdev(mdp_major
, "mdp");
4442 unregister_reboot_notifier(&md_notifier
);
4443 unregister_sysctl_table(raid_table_header
);
4444 remove_proc_entry("mdstat", NULL
);
4445 ITERATE_MDDEV(mddev
,tmp
) {
4446 struct gendisk
*disk
= mddev
->gendisk
;
4449 export_array(mddev
);
4452 mddev
->gendisk
= NULL
;
4457 module_init(md_init
)
4458 module_exit(md_exit
)
4460 static int get_ro(char *buffer
, struct kernel_param
*kp
)
4462 return sprintf(buffer
, "%d", start_readonly
);
4464 static int set_ro(const char *val
, struct kernel_param
*kp
)
4467 int num
= simple_strtoul(val
, &e
, 10);
4468 if (*val
&& (*e
== '\0' || *e
== '\n')) {
4469 start_readonly
= num
;
4475 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, 0600);
4477 EXPORT_SYMBOL(register_md_personality
);
4478 EXPORT_SYMBOL(unregister_md_personality
);
4479 EXPORT_SYMBOL(md_error
);
4480 EXPORT_SYMBOL(md_done_sync
);
4481 EXPORT_SYMBOL(md_write_start
);
4482 EXPORT_SYMBOL(md_write_end
);
4483 EXPORT_SYMBOL(md_register_thread
);
4484 EXPORT_SYMBOL(md_unregister_thread
);
4485 EXPORT_SYMBOL(md_wakeup_thread
);
4486 EXPORT_SYMBOL(md_print_devices
);
4487 EXPORT_SYMBOL(md_check_recovery
);
4488 MODULE_LICENSE("GPL");
4490 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);