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/kernel.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/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part
);
72 static LIST_HEAD(pers_list
);
73 static DEFINE_SPINLOCK(pers_lock
);
75 static void md_print_devices(void);
77 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min
= 1000;
93 static int sysctl_speed_limit_max
= 200000;
94 static inline int speed_min(mddev_t
*mddev
)
96 return mddev
->sync_speed_min
?
97 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
100 static inline int speed_max(mddev_t
*mddev
)
102 return mddev
->sync_speed_max
?
103 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
106 static struct ctl_table_header
*raid_table_header
;
108 static ctl_table raid_table
[] = {
110 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
111 .procname
= "speed_limit_min",
112 .data
= &sysctl_speed_limit_min
,
113 .maxlen
= sizeof(int),
114 .mode
= S_IRUGO
|S_IWUSR
,
115 .proc_handler
= &proc_dointvec
,
118 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
119 .procname
= "speed_limit_max",
120 .data
= &sysctl_speed_limit_max
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= &proc_dointvec
,
128 static ctl_table raid_dir_table
[] = {
130 .ctl_name
= DEV_RAID
,
133 .mode
= S_IRUGO
|S_IXUGO
,
139 static ctl_table raid_root_table
[] = {
145 .child
= raid_dir_table
,
150 static struct block_device_operations md_fops
;
152 static int start_readonly
;
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
164 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
165 static atomic_t md_event_count
;
166 void md_new_event(mddev_t
*mddev
)
168 atomic_inc(&md_event_count
);
169 wake_up(&md_event_waiters
);
170 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
172 EXPORT_SYMBOL_GPL(md_new_event
);
174 /* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
177 static void md_new_event_inintr(mddev_t
*mddev
)
179 atomic_inc(&md_event_count
);
180 wake_up(&md_event_waiters
);
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
187 static LIST_HEAD(all_mddevs
);
188 static DEFINE_SPINLOCK(all_mddevs_lock
);
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
198 #define ITERATE_MDDEV(mddev,tmp) \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
214 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
216 bio_io_error(bio
, bio
->bi_size
);
220 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
222 atomic_inc(&mddev
->active
);
226 static void mddev_put(mddev_t
*mddev
)
228 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
230 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
231 list_del(&mddev
->all_mddevs
);
232 spin_unlock(&all_mddevs_lock
);
233 blk_cleanup_queue(mddev
->queue
);
234 kobject_unregister(&mddev
->kobj
);
236 spin_unlock(&all_mddevs_lock
);
239 static mddev_t
* mddev_find(dev_t unit
)
241 mddev_t
*mddev
, *new = NULL
;
244 spin_lock(&all_mddevs_lock
);
245 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
246 if (mddev
->unit
== unit
) {
248 spin_unlock(&all_mddevs_lock
);
254 list_add(&new->all_mddevs
, &all_mddevs
);
255 spin_unlock(&all_mddevs_lock
);
258 spin_unlock(&all_mddevs_lock
);
260 new = kzalloc(sizeof(*new), GFP_KERNEL
);
265 if (MAJOR(unit
) == MD_MAJOR
)
266 new->md_minor
= MINOR(unit
);
268 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
270 mutex_init(&new->reconfig_mutex
);
271 INIT_LIST_HEAD(&new->disks
);
272 INIT_LIST_HEAD(&new->all_mddevs
);
273 init_timer(&new->safemode_timer
);
274 atomic_set(&new->active
, 1);
275 spin_lock_init(&new->write_lock
);
276 init_waitqueue_head(&new->sb_wait
);
277 new->reshape_position
= MaxSector
;
279 new->queue
= blk_alloc_queue(GFP_KERNEL
);
284 set_bit(QUEUE_FLAG_CLUSTER
, &new->queue
->queue_flags
);
286 blk_queue_make_request(new->queue
, md_fail_request
);
291 static inline int mddev_lock(mddev_t
* mddev
)
293 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
296 static inline int mddev_trylock(mddev_t
* mddev
)
298 return mutex_trylock(&mddev
->reconfig_mutex
);
301 static inline void mddev_unlock(mddev_t
* mddev
)
303 mutex_unlock(&mddev
->reconfig_mutex
);
305 md_wakeup_thread(mddev
->thread
);
308 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
311 struct list_head
*tmp
;
313 ITERATE_RDEV(mddev
,rdev
,tmp
) {
314 if (rdev
->desc_nr
== nr
)
320 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
322 struct list_head
*tmp
;
325 ITERATE_RDEV(mddev
,rdev
,tmp
) {
326 if (rdev
->bdev
->bd_dev
== dev
)
332 static struct mdk_personality
*find_pers(int level
, char *clevel
)
334 struct mdk_personality
*pers
;
335 list_for_each_entry(pers
, &pers_list
, list
) {
336 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
338 if (strcmp(pers
->name
, clevel
)==0)
344 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
346 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
347 return MD_NEW_SIZE_BLOCKS(size
);
350 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
354 size
= rdev
->sb_offset
;
357 size
&= ~((sector_t
)chunk_size
/1024 - 1);
361 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
366 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
367 if (!rdev
->sb_page
) {
368 printk(KERN_ALERT
"md: out of memory.\n");
375 static void free_disk_sb(mdk_rdev_t
* rdev
)
378 put_page(rdev
->sb_page
);
380 rdev
->sb_page
= NULL
;
387 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
389 mdk_rdev_t
*rdev
= bio
->bi_private
;
390 mddev_t
*mddev
= rdev
->mddev
;
394 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
395 printk("md: super_written gets error=%d, uptodate=%d\n",
396 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
397 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
398 md_error(mddev
, rdev
);
401 if (atomic_dec_and_test(&mddev
->pending_writes
))
402 wake_up(&mddev
->sb_wait
);
407 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
409 struct bio
*bio2
= bio
->bi_private
;
410 mdk_rdev_t
*rdev
= bio2
->bi_private
;
411 mddev_t
*mddev
= rdev
->mddev
;
415 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
416 error
== -EOPNOTSUPP
) {
418 /* barriers don't appear to be supported :-( */
419 set_bit(BarriersNotsupp
, &rdev
->flags
);
420 mddev
->barriers_work
= 0;
421 spin_lock_irqsave(&mddev
->write_lock
, flags
);
422 bio2
->bi_next
= mddev
->biolist
;
423 mddev
->biolist
= bio2
;
424 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
425 wake_up(&mddev
->sb_wait
);
430 bio
->bi_private
= rdev
;
431 return super_written(bio
, bytes_done
, error
);
434 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
435 sector_t sector
, int size
, struct page
*page
)
437 /* write first size bytes of page to sector of rdev
438 * Increment mddev->pending_writes before returning
439 * and decrement it on completion, waking up sb_wait
440 * if zero is reached.
441 * If an error occurred, call md_error
443 * As we might need to resubmit the request if BIO_RW_BARRIER
444 * causes ENOTSUPP, we allocate a spare bio...
446 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
447 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
449 bio
->bi_bdev
= rdev
->bdev
;
450 bio
->bi_sector
= sector
;
451 bio_add_page(bio
, page
, size
, 0);
452 bio
->bi_private
= rdev
;
453 bio
->bi_end_io
= super_written
;
456 atomic_inc(&mddev
->pending_writes
);
457 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
459 rw
|= (1<<BIO_RW_BARRIER
);
460 rbio
= bio_clone(bio
, GFP_NOIO
);
461 rbio
->bi_private
= bio
;
462 rbio
->bi_end_io
= super_written_barrier
;
463 submit_bio(rw
, rbio
);
468 void md_super_wait(mddev_t
*mddev
)
470 /* wait for all superblock writes that were scheduled to complete.
471 * if any had to be retried (due to BARRIER problems), retry them
475 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
476 if (atomic_read(&mddev
->pending_writes
)==0)
478 while (mddev
->biolist
) {
480 spin_lock_irq(&mddev
->write_lock
);
481 bio
= mddev
->biolist
;
482 mddev
->biolist
= bio
->bi_next
;
484 spin_unlock_irq(&mddev
->write_lock
);
485 submit_bio(bio
->bi_rw
, bio
);
489 finish_wait(&mddev
->sb_wait
, &wq
);
492 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
497 complete((struct completion
*)bio
->bi_private
);
501 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
502 struct page
*page
, int rw
)
504 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
505 struct completion event
;
508 rw
|= (1 << BIO_RW_SYNC
);
511 bio
->bi_sector
= sector
;
512 bio_add_page(bio
, page
, size
, 0);
513 init_completion(&event
);
514 bio
->bi_private
= &event
;
515 bio
->bi_end_io
= bi_complete
;
517 wait_for_completion(&event
);
519 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
523 EXPORT_SYMBOL_GPL(sync_page_io
);
525 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
527 char b
[BDEVNAME_SIZE
];
528 if (!rdev
->sb_page
) {
536 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
542 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
543 bdevname(rdev
->bdev
,b
));
547 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
549 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
550 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
551 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
552 (sb1
->set_uuid3
== sb2
->set_uuid3
))
560 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
563 mdp_super_t
*tmp1
, *tmp2
;
565 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
566 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
568 if (!tmp1
|| !tmp2
) {
570 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
578 * nr_disks is not constant
583 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
595 static u32
md_csum_fold(u32 csum
)
597 csum
= (csum
& 0xffff) + (csum
>> 16);
598 return (csum
& 0xffff) + (csum
>> 16);
601 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
604 u32
*sb32
= (u32
*)sb
;
606 unsigned int disk_csum
, csum
;
608 disk_csum
= sb
->sb_csum
;
611 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
613 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
617 /* This used to use csum_partial, which was wrong for several
618 * reasons including that different results are returned on
619 * different architectures. It isn't critical that we get exactly
620 * the same return value as before (we always csum_fold before
621 * testing, and that removes any differences). However as we
622 * know that csum_partial always returned a 16bit value on
623 * alphas, do a fold to maximise conformity to previous behaviour.
625 sb
->sb_csum
= md_csum_fold(disk_csum
);
627 sb
->sb_csum
= disk_csum
;
634 * Handle superblock details.
635 * We want to be able to handle multiple superblock formats
636 * so we have a common interface to them all, and an array of
637 * different handlers.
638 * We rely on user-space to write the initial superblock, and support
639 * reading and updating of superblocks.
640 * Interface methods are:
641 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
642 * loads and validates a superblock on dev.
643 * if refdev != NULL, compare superblocks on both devices
645 * 0 - dev has a superblock that is compatible with refdev
646 * 1 - dev has a superblock that is compatible and newer than refdev
647 * so dev should be used as the refdev in future
648 * -EINVAL superblock incompatible or invalid
649 * -othererror e.g. -EIO
651 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
652 * Verify that dev is acceptable into mddev.
653 * The first time, mddev->raid_disks will be 0, and data from
654 * dev should be merged in. Subsequent calls check that dev
655 * is new enough. Return 0 or -EINVAL
657 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
658 * Update the superblock for rdev with data in mddev
659 * This does not write to disc.
665 struct module
*owner
;
666 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
667 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
668 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
672 * load_super for 0.90.0
674 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
676 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
682 * Calculate the position of the superblock,
683 * it's at the end of the disk.
685 * It also happens to be a multiple of 4Kb.
687 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
688 rdev
->sb_offset
= sb_offset
;
690 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
695 bdevname(rdev
->bdev
, b
);
696 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
698 if (sb
->md_magic
!= MD_SB_MAGIC
) {
699 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
704 if (sb
->major_version
!= 0 ||
705 sb
->minor_version
< 90 ||
706 sb
->minor_version
> 91) {
707 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
708 sb
->major_version
, sb
->minor_version
,
713 if (sb
->raid_disks
<= 0)
716 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
717 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
722 rdev
->preferred_minor
= sb
->md_minor
;
723 rdev
->data_offset
= 0;
724 rdev
->sb_size
= MD_SB_BYTES
;
726 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
727 if (sb
->level
!= 1 && sb
->level
!= 4
728 && sb
->level
!= 5 && sb
->level
!= 6
729 && sb
->level
!= 10) {
730 /* FIXME use a better test */
732 "md: bitmaps not supported for this level.\n");
737 if (sb
->level
== LEVEL_MULTIPATH
)
740 rdev
->desc_nr
= sb
->this_disk
.number
;
746 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
747 if (!uuid_equal(refsb
, sb
)) {
748 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
749 b
, bdevname(refdev
->bdev
,b2
));
752 if (!sb_equal(refsb
, sb
)) {
753 printk(KERN_WARNING
"md: %s has same UUID"
754 " but different superblock to %s\n",
755 b
, bdevname(refdev
->bdev
, b2
));
759 ev2
= md_event(refsb
);
765 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
767 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
768 /* "this cannot possibly happen" ... */
776 * validate_super for 0.90.0
778 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
781 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
782 __u64 ev1
= md_event(sb
);
784 rdev
->raid_disk
= -1;
786 if (mddev
->raid_disks
== 0) {
787 mddev
->major_version
= 0;
788 mddev
->minor_version
= sb
->minor_version
;
789 mddev
->patch_version
= sb
->patch_version
;
790 mddev
->persistent
= ! sb
->not_persistent
;
791 mddev
->chunk_size
= sb
->chunk_size
;
792 mddev
->ctime
= sb
->ctime
;
793 mddev
->utime
= sb
->utime
;
794 mddev
->level
= sb
->level
;
795 mddev
->clevel
[0] = 0;
796 mddev
->layout
= sb
->layout
;
797 mddev
->raid_disks
= sb
->raid_disks
;
798 mddev
->size
= sb
->size
;
800 mddev
->bitmap_offset
= 0;
801 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
803 if (mddev
->minor_version
>= 91) {
804 mddev
->reshape_position
= sb
->reshape_position
;
805 mddev
->delta_disks
= sb
->delta_disks
;
806 mddev
->new_level
= sb
->new_level
;
807 mddev
->new_layout
= sb
->new_layout
;
808 mddev
->new_chunk
= sb
->new_chunk
;
810 mddev
->reshape_position
= MaxSector
;
811 mddev
->delta_disks
= 0;
812 mddev
->new_level
= mddev
->level
;
813 mddev
->new_layout
= mddev
->layout
;
814 mddev
->new_chunk
= mddev
->chunk_size
;
817 if (sb
->state
& (1<<MD_SB_CLEAN
))
818 mddev
->recovery_cp
= MaxSector
;
820 if (sb
->events_hi
== sb
->cp_events_hi
&&
821 sb
->events_lo
== sb
->cp_events_lo
) {
822 mddev
->recovery_cp
= sb
->recovery_cp
;
824 mddev
->recovery_cp
= 0;
827 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
828 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
829 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
830 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
832 mddev
->max_disks
= MD_SB_DISKS
;
834 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
835 mddev
->bitmap_file
== NULL
)
836 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
838 } else if (mddev
->pers
== NULL
) {
839 /* Insist on good event counter while assembling */
841 if (ev1
< mddev
->events
)
843 } else if (mddev
->bitmap
) {
844 /* if adding to array with a bitmap, then we can accept an
845 * older device ... but not too old.
847 if (ev1
< mddev
->bitmap
->events_cleared
)
850 if (ev1
< mddev
->events
)
851 /* just a hot-add of a new device, leave raid_disk at -1 */
855 if (mddev
->level
!= LEVEL_MULTIPATH
) {
856 desc
= sb
->disks
+ rdev
->desc_nr
;
858 if (desc
->state
& (1<<MD_DISK_FAULTY
))
859 set_bit(Faulty
, &rdev
->flags
);
860 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
861 desc->raid_disk < mddev->raid_disks */) {
862 set_bit(In_sync
, &rdev
->flags
);
863 rdev
->raid_disk
= desc
->raid_disk
;
865 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
866 set_bit(WriteMostly
, &rdev
->flags
);
867 } else /* MULTIPATH are always insync */
868 set_bit(In_sync
, &rdev
->flags
);
873 * sync_super for 0.90.0
875 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
878 struct list_head
*tmp
;
880 int next_spare
= mddev
->raid_disks
;
883 /* make rdev->sb match mddev data..
886 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
887 * 3/ any empty disks < next_spare become removed
889 * disks[0] gets initialised to REMOVED because
890 * we cannot be sure from other fields if it has
891 * been initialised or not.
894 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
896 rdev
->sb_size
= MD_SB_BYTES
;
898 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
900 memset(sb
, 0, sizeof(*sb
));
902 sb
->md_magic
= MD_SB_MAGIC
;
903 sb
->major_version
= mddev
->major_version
;
904 sb
->patch_version
= mddev
->patch_version
;
905 sb
->gvalid_words
= 0; /* ignored */
906 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
907 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
908 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
909 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
911 sb
->ctime
= mddev
->ctime
;
912 sb
->level
= mddev
->level
;
913 sb
->size
= mddev
->size
;
914 sb
->raid_disks
= mddev
->raid_disks
;
915 sb
->md_minor
= mddev
->md_minor
;
916 sb
->not_persistent
= !mddev
->persistent
;
917 sb
->utime
= mddev
->utime
;
919 sb
->events_hi
= (mddev
->events
>>32);
920 sb
->events_lo
= (u32
)mddev
->events
;
922 if (mddev
->reshape_position
== MaxSector
)
923 sb
->minor_version
= 90;
925 sb
->minor_version
= 91;
926 sb
->reshape_position
= mddev
->reshape_position
;
927 sb
->new_level
= mddev
->new_level
;
928 sb
->delta_disks
= mddev
->delta_disks
;
929 sb
->new_layout
= mddev
->new_layout
;
930 sb
->new_chunk
= mddev
->new_chunk
;
932 mddev
->minor_version
= sb
->minor_version
;
935 sb
->recovery_cp
= mddev
->recovery_cp
;
936 sb
->cp_events_hi
= (mddev
->events
>>32);
937 sb
->cp_events_lo
= (u32
)mddev
->events
;
938 if (mddev
->recovery_cp
== MaxSector
)
939 sb
->state
= (1<< MD_SB_CLEAN
);
943 sb
->layout
= mddev
->layout
;
944 sb
->chunk_size
= mddev
->chunk_size
;
946 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
947 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
949 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
950 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
953 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
954 && !test_bit(Faulty
, &rdev2
->flags
))
955 desc_nr
= rdev2
->raid_disk
;
957 desc_nr
= next_spare
++;
958 rdev2
->desc_nr
= desc_nr
;
959 d
= &sb
->disks
[rdev2
->desc_nr
];
961 d
->number
= rdev2
->desc_nr
;
962 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
963 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
964 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
965 && !test_bit(Faulty
, &rdev2
->flags
))
966 d
->raid_disk
= rdev2
->raid_disk
;
968 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
969 if (test_bit(Faulty
, &rdev2
->flags
))
970 d
->state
= (1<<MD_DISK_FAULTY
);
971 else if (test_bit(In_sync
, &rdev2
->flags
)) {
972 d
->state
= (1<<MD_DISK_ACTIVE
);
973 d
->state
|= (1<<MD_DISK_SYNC
);
981 if (test_bit(WriteMostly
, &rdev2
->flags
))
982 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
984 /* now set the "removed" and "faulty" bits on any missing devices */
985 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
986 mdp_disk_t
*d
= &sb
->disks
[i
];
987 if (d
->state
== 0 && d
->number
== 0) {
990 d
->state
= (1<<MD_DISK_REMOVED
);
991 d
->state
|= (1<<MD_DISK_FAULTY
);
995 sb
->nr_disks
= nr_disks
;
996 sb
->active_disks
= active
;
997 sb
->working_disks
= working
;
998 sb
->failed_disks
= failed
;
999 sb
->spare_disks
= spare
;
1001 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1002 sb
->sb_csum
= calc_sb_csum(sb
);
1006 * version 1 superblock
1009 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1013 unsigned long long newcsum
;
1014 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1015 __le32
*isuper
= (__le32
*)sb
;
1018 disk_csum
= sb
->sb_csum
;
1021 for (i
=0; size
>=4; size
-= 4 )
1022 newcsum
+= le32_to_cpu(*isuper
++);
1025 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1027 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1028 sb
->sb_csum
= disk_csum
;
1029 return cpu_to_le32(csum
);
1032 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1034 struct mdp_superblock_1
*sb
;
1037 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1041 * Calculate the position of the superblock.
1042 * It is always aligned to a 4K boundary and
1043 * depeding on minor_version, it can be:
1044 * 0: At least 8K, but less than 12K, from end of device
1045 * 1: At start of device
1046 * 2: 4K from start of device.
1048 switch(minor_version
) {
1050 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1052 sb_offset
&= ~(sector_t
)(4*2-1);
1053 /* convert from sectors to K */
1065 rdev
->sb_offset
= sb_offset
;
1067 /* superblock is rarely larger than 1K, but it can be larger,
1068 * and it is safe to read 4k, so we do that
1070 ret
= read_disk_sb(rdev
, 4096);
1071 if (ret
) return ret
;
1074 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1076 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1077 sb
->major_version
!= cpu_to_le32(1) ||
1078 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1079 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1080 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1083 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1084 printk("md: invalid superblock checksum on %s\n",
1085 bdevname(rdev
->bdev
,b
));
1088 if (le64_to_cpu(sb
->data_size
) < 10) {
1089 printk("md: data_size too small on %s\n",
1090 bdevname(rdev
->bdev
,b
));
1093 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1094 if (sb
->level
!= cpu_to_le32(1) &&
1095 sb
->level
!= cpu_to_le32(4) &&
1096 sb
->level
!= cpu_to_le32(5) &&
1097 sb
->level
!= cpu_to_le32(6) &&
1098 sb
->level
!= cpu_to_le32(10)) {
1100 "md: bitmaps not supported for this level.\n");
1105 rdev
->preferred_minor
= 0xffff;
1106 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1107 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1109 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1110 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1111 if (rdev
->sb_size
& bmask
)
1112 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1114 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1117 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1123 struct mdp_superblock_1
*refsb
=
1124 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1126 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1127 sb
->level
!= refsb
->level
||
1128 sb
->layout
!= refsb
->layout
||
1129 sb
->chunksize
!= refsb
->chunksize
) {
1130 printk(KERN_WARNING
"md: %s has strangely different"
1131 " superblock to %s\n",
1132 bdevname(rdev
->bdev
,b
),
1133 bdevname(refdev
->bdev
,b2
));
1136 ev1
= le64_to_cpu(sb
->events
);
1137 ev2
= le64_to_cpu(refsb
->events
);
1145 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1147 rdev
->size
= rdev
->sb_offset
;
1148 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1150 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1151 if (le32_to_cpu(sb
->chunksize
))
1152 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1154 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1159 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1161 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1162 __u64 ev1
= le64_to_cpu(sb
->events
);
1164 rdev
->raid_disk
= -1;
1166 if (mddev
->raid_disks
== 0) {
1167 mddev
->major_version
= 1;
1168 mddev
->patch_version
= 0;
1169 mddev
->persistent
= 1;
1170 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1171 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1172 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1173 mddev
->level
= le32_to_cpu(sb
->level
);
1174 mddev
->clevel
[0] = 0;
1175 mddev
->layout
= le32_to_cpu(sb
->layout
);
1176 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1177 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1178 mddev
->events
= ev1
;
1179 mddev
->bitmap_offset
= 0;
1180 mddev
->default_bitmap_offset
= 1024 >> 9;
1182 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1183 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1185 mddev
->max_disks
= (4096-256)/2;
1187 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1188 mddev
->bitmap_file
== NULL
)
1189 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1191 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1192 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1193 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1194 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1195 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1196 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1198 mddev
->reshape_position
= MaxSector
;
1199 mddev
->delta_disks
= 0;
1200 mddev
->new_level
= mddev
->level
;
1201 mddev
->new_layout
= mddev
->layout
;
1202 mddev
->new_chunk
= mddev
->chunk_size
;
1205 } else if (mddev
->pers
== NULL
) {
1206 /* Insist of good event counter while assembling */
1208 if (ev1
< mddev
->events
)
1210 } else if (mddev
->bitmap
) {
1211 /* If adding to array with a bitmap, then we can accept an
1212 * older device, but not too old.
1214 if (ev1
< mddev
->bitmap
->events_cleared
)
1217 if (ev1
< mddev
->events
)
1218 /* just a hot-add of a new device, leave raid_disk at -1 */
1221 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1223 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1225 case 0xffff: /* spare */
1227 case 0xfffe: /* faulty */
1228 set_bit(Faulty
, &rdev
->flags
);
1231 if ((le32_to_cpu(sb
->feature_map
) &
1232 MD_FEATURE_RECOVERY_OFFSET
))
1233 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1235 set_bit(In_sync
, &rdev
->flags
);
1236 rdev
->raid_disk
= role
;
1239 if (sb
->devflags
& WriteMostly1
)
1240 set_bit(WriteMostly
, &rdev
->flags
);
1241 } else /* MULTIPATH are always insync */
1242 set_bit(In_sync
, &rdev
->flags
);
1247 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1249 struct mdp_superblock_1
*sb
;
1250 struct list_head
*tmp
;
1253 /* make rdev->sb match mddev and rdev data. */
1255 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1257 sb
->feature_map
= 0;
1259 sb
->recovery_offset
= cpu_to_le64(0);
1260 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1261 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1262 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1264 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1265 sb
->events
= cpu_to_le64(mddev
->events
);
1267 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1269 sb
->resync_offset
= cpu_to_le64(0);
1271 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1273 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1274 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1276 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1277 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1278 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1281 if (rdev
->raid_disk
>= 0 &&
1282 !test_bit(In_sync
, &rdev
->flags
) &&
1283 rdev
->recovery_offset
> 0) {
1284 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1285 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1288 if (mddev
->reshape_position
!= MaxSector
) {
1289 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1290 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1291 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1292 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1293 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1294 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1298 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1299 if (rdev2
->desc_nr
+1 > max_dev
)
1300 max_dev
= rdev2
->desc_nr
+1;
1302 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1303 sb
->max_dev
= cpu_to_le32(max_dev
);
1304 for (i
=0; i
<max_dev
;i
++)
1305 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1307 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1309 if (test_bit(Faulty
, &rdev2
->flags
))
1310 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1311 else if (test_bit(In_sync
, &rdev2
->flags
))
1312 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1313 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1314 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1316 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1319 sb
->sb_csum
= calc_sb_1_csum(sb
);
1323 static struct super_type super_types
[] = {
1326 .owner
= THIS_MODULE
,
1327 .load_super
= super_90_load
,
1328 .validate_super
= super_90_validate
,
1329 .sync_super
= super_90_sync
,
1333 .owner
= THIS_MODULE
,
1334 .load_super
= super_1_load
,
1335 .validate_super
= super_1_validate
,
1336 .sync_super
= super_1_sync
,
1340 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1342 struct list_head
*tmp
, *tmp2
;
1343 mdk_rdev_t
*rdev
, *rdev2
;
1345 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1346 ITERATE_RDEV(mddev2
, rdev2
, tmp2
)
1347 if (rdev
->bdev
->bd_contains
==
1348 rdev2
->bdev
->bd_contains
)
1354 static LIST_HEAD(pending_raid_disks
);
1356 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1358 char b
[BDEVNAME_SIZE
];
1367 /* make sure rdev->size exceeds mddev->size */
1368 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1370 /* Cannot change size, so fail
1371 * If mddev->level <= 0, then we don't care
1372 * about aligning sizes (e.g. linear)
1374 if (mddev
->level
> 0)
1377 mddev
->size
= rdev
->size
;
1380 /* Verify rdev->desc_nr is unique.
1381 * If it is -1, assign a free number, else
1382 * check number is not in use
1384 if (rdev
->desc_nr
< 0) {
1386 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1387 while (find_rdev_nr(mddev
, choice
))
1389 rdev
->desc_nr
= choice
;
1391 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1394 bdevname(rdev
->bdev
,b
);
1395 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1397 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1400 rdev
->mddev
= mddev
;
1401 printk(KERN_INFO
"md: bind<%s>\n", b
);
1403 rdev
->kobj
.parent
= &mddev
->kobj
;
1404 if ((err
= kobject_add(&rdev
->kobj
)))
1407 if (rdev
->bdev
->bd_part
)
1408 ko
= &rdev
->bdev
->bd_part
->kobj
;
1410 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1411 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1412 kobject_del(&rdev
->kobj
);
1415 list_add(&rdev
->same_set
, &mddev
->disks
);
1416 bd_claim_by_disk(rdev
->bdev
, rdev
, mddev
->gendisk
);
1420 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1425 static void delayed_delete(struct work_struct
*ws
)
1427 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1428 kobject_del(&rdev
->kobj
);
1431 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1433 char b
[BDEVNAME_SIZE
];
1438 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1439 list_del_init(&rdev
->same_set
);
1440 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1442 sysfs_remove_link(&rdev
->kobj
, "block");
1444 /* We need to delay this, otherwise we can deadlock when
1445 * writing to 'remove' to "dev/state"
1447 INIT_WORK(&rdev
->del_work
, delayed_delete
);
1448 schedule_work(&rdev
->del_work
);
1452 * prevent the device from being mounted, repartitioned or
1453 * otherwise reused by a RAID array (or any other kernel
1454 * subsystem), by bd_claiming the device.
1456 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1459 struct block_device
*bdev
;
1460 char b
[BDEVNAME_SIZE
];
1462 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1464 printk(KERN_ERR
"md: could not open %s.\n",
1465 __bdevname(dev
, b
));
1466 return PTR_ERR(bdev
);
1468 err
= bd_claim(bdev
, rdev
);
1470 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1479 static void unlock_rdev(mdk_rdev_t
*rdev
)
1481 struct block_device
*bdev
= rdev
->bdev
;
1489 void md_autodetect_dev(dev_t dev
);
1491 static void export_rdev(mdk_rdev_t
* rdev
)
1493 char b
[BDEVNAME_SIZE
];
1494 printk(KERN_INFO
"md: export_rdev(%s)\n",
1495 bdevname(rdev
->bdev
,b
));
1499 list_del_init(&rdev
->same_set
);
1501 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1504 kobject_put(&rdev
->kobj
);
1507 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1509 unbind_rdev_from_array(rdev
);
1513 static void export_array(mddev_t
*mddev
)
1515 struct list_head
*tmp
;
1518 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1523 kick_rdev_from_array(rdev
);
1525 if (!list_empty(&mddev
->disks
))
1527 mddev
->raid_disks
= 0;
1528 mddev
->major_version
= 0;
1531 static void print_desc(mdp_disk_t
*desc
)
1533 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1534 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1537 static void print_sb(mdp_super_t
*sb
)
1542 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1543 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1544 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1546 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1547 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1548 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1549 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1550 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1551 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1552 sb
->failed_disks
, sb
->spare_disks
,
1553 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1556 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1559 desc
= sb
->disks
+ i
;
1560 if (desc
->number
|| desc
->major
|| desc
->minor
||
1561 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1562 printk(" D %2d: ", i
);
1566 printk(KERN_INFO
"md: THIS: ");
1567 print_desc(&sb
->this_disk
);
1571 static void print_rdev(mdk_rdev_t
*rdev
)
1573 char b
[BDEVNAME_SIZE
];
1574 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1575 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1576 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1578 if (rdev
->sb_loaded
) {
1579 printk(KERN_INFO
"md: rdev superblock:\n");
1580 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1582 printk(KERN_INFO
"md: no rdev superblock!\n");
1585 static void md_print_devices(void)
1587 struct list_head
*tmp
, *tmp2
;
1590 char b
[BDEVNAME_SIZE
];
1593 printk("md: **********************************\n");
1594 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1595 printk("md: **********************************\n");
1596 ITERATE_MDDEV(mddev
,tmp
) {
1599 bitmap_print_sb(mddev
->bitmap
);
1601 printk("%s: ", mdname(mddev
));
1602 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1603 printk("<%s>", bdevname(rdev
->bdev
,b
));
1606 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1609 printk("md: **********************************\n");
1614 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1616 /* Update each superblock (in-memory image), but
1617 * if we are allowed to, skip spares which already
1618 * have the right event counter, or have one earlier
1619 * (which would mean they aren't being marked as dirty
1620 * with the rest of the array)
1623 struct list_head
*tmp
;
1625 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1626 if (rdev
->sb_events
== mddev
->events
||
1628 rdev
->raid_disk
< 0 &&
1629 (rdev
->sb_events
&1)==0 &&
1630 rdev
->sb_events
+1 == mddev
->events
)) {
1631 /* Don't update this superblock */
1632 rdev
->sb_loaded
= 2;
1634 super_types
[mddev
->major_version
].
1635 sync_super(mddev
, rdev
);
1636 rdev
->sb_loaded
= 1;
1641 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1644 struct list_head
*tmp
;
1650 spin_lock_irq(&mddev
->write_lock
);
1652 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1653 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1655 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1656 /* just a clean<-> dirty transition, possibly leave spares alone,
1657 * though if events isn't the right even/odd, we will have to do
1663 if (mddev
->degraded
)
1664 /* If the array is degraded, then skipping spares is both
1665 * dangerous and fairly pointless.
1666 * Dangerous because a device that was removed from the array
1667 * might have a event_count that still looks up-to-date,
1668 * so it can be re-added without a resync.
1669 * Pointless because if there are any spares to skip,
1670 * then a recovery will happen and soon that array won't
1671 * be degraded any more and the spare can go back to sleep then.
1675 sync_req
= mddev
->in_sync
;
1676 mddev
->utime
= get_seconds();
1678 /* If this is just a dirty<->clean transition, and the array is clean
1679 * and 'events' is odd, we can roll back to the previous clean state */
1681 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1682 && (mddev
->events
& 1)
1683 && mddev
->events
!= 1)
1686 /* otherwise we have to go forward and ... */
1688 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1689 /* .. if the array isn't clean, insist on an odd 'events' */
1690 if ((mddev
->events
&1)==0) {
1695 /* otherwise insist on an even 'events' (for clean states) */
1696 if ((mddev
->events
&1)) {
1703 if (!mddev
->events
) {
1705 * oops, this 64-bit counter should never wrap.
1706 * Either we are in around ~1 trillion A.C., assuming
1707 * 1 reboot per second, or we have a bug:
1712 sync_sbs(mddev
, nospares
);
1715 * do not write anything to disk if using
1716 * nonpersistent superblocks
1718 if (!mddev
->persistent
) {
1719 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1720 spin_unlock_irq(&mddev
->write_lock
);
1721 wake_up(&mddev
->sb_wait
);
1724 spin_unlock_irq(&mddev
->write_lock
);
1727 "md: updating %s RAID superblock on device (in sync %d)\n",
1728 mdname(mddev
),mddev
->in_sync
);
1730 err
= bitmap_update_sb(mddev
->bitmap
);
1731 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1732 char b
[BDEVNAME_SIZE
];
1733 dprintk(KERN_INFO
"md: ");
1734 if (rdev
->sb_loaded
!= 1)
1735 continue; /* no noise on spare devices */
1736 if (test_bit(Faulty
, &rdev
->flags
))
1737 dprintk("(skipping faulty ");
1739 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1740 if (!test_bit(Faulty
, &rdev
->flags
)) {
1741 md_super_write(mddev
,rdev
,
1742 rdev
->sb_offset
<<1, rdev
->sb_size
,
1744 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1745 bdevname(rdev
->bdev
,b
),
1746 (unsigned long long)rdev
->sb_offset
);
1747 rdev
->sb_events
= mddev
->events
;
1751 if (mddev
->level
== LEVEL_MULTIPATH
)
1752 /* only need to write one superblock... */
1755 md_super_wait(mddev
);
1756 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1758 spin_lock_irq(&mddev
->write_lock
);
1759 if (mddev
->in_sync
!= sync_req
||
1760 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1761 /* have to write it out again */
1762 spin_unlock_irq(&mddev
->write_lock
);
1765 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1766 spin_unlock_irq(&mddev
->write_lock
);
1767 wake_up(&mddev
->sb_wait
);
1771 /* words written to sysfs files may, or my not, be \n terminated.
1772 * We want to accept with case. For this we use cmd_match.
1774 static int cmd_match(const char *cmd
, const char *str
)
1776 /* See if cmd, written into a sysfs file, matches
1777 * str. They must either be the same, or cmd can
1778 * have a trailing newline
1780 while (*cmd
&& *str
&& *cmd
== *str
) {
1791 struct rdev_sysfs_entry
{
1792 struct attribute attr
;
1793 ssize_t (*show
)(mdk_rdev_t
*, char *);
1794 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1798 state_show(mdk_rdev_t
*rdev
, char *page
)
1803 if (test_bit(Faulty
, &rdev
->flags
)) {
1804 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1807 if (test_bit(In_sync
, &rdev
->flags
)) {
1808 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1811 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1812 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1815 if (!test_bit(Faulty
, &rdev
->flags
) &&
1816 !test_bit(In_sync
, &rdev
->flags
)) {
1817 len
+= sprintf(page
+len
, "%sspare", sep
);
1820 return len
+sprintf(page
+len
, "\n");
1824 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1827 * faulty - simulates and error
1828 * remove - disconnects the device
1829 * writemostly - sets write_mostly
1830 * -writemostly - clears write_mostly
1833 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1834 md_error(rdev
->mddev
, rdev
);
1836 } else if (cmd_match(buf
, "remove")) {
1837 if (rdev
->raid_disk
>= 0)
1840 mddev_t
*mddev
= rdev
->mddev
;
1841 kick_rdev_from_array(rdev
);
1843 md_update_sb(mddev
, 1);
1844 md_new_event(mddev
);
1847 } else if (cmd_match(buf
, "writemostly")) {
1848 set_bit(WriteMostly
, &rdev
->flags
);
1850 } else if (cmd_match(buf
, "-writemostly")) {
1851 clear_bit(WriteMostly
, &rdev
->flags
);
1854 return err
? err
: len
;
1856 static struct rdev_sysfs_entry rdev_state
=
1857 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1860 super_show(mdk_rdev_t
*rdev
, char *page
)
1862 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1863 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1864 return rdev
->sb_size
;
1868 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1871 errors_show(mdk_rdev_t
*rdev
, char *page
)
1873 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1877 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1880 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1881 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1882 atomic_set(&rdev
->corrected_errors
, n
);
1887 static struct rdev_sysfs_entry rdev_errors
=
1888 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1891 slot_show(mdk_rdev_t
*rdev
, char *page
)
1893 if (rdev
->raid_disk
< 0)
1894 return sprintf(page
, "none\n");
1896 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1900 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1903 int slot
= simple_strtoul(buf
, &e
, 10);
1904 if (strncmp(buf
, "none", 4)==0)
1906 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1908 if (rdev
->mddev
->pers
)
1909 /* Cannot set slot in active array (yet) */
1911 if (slot
>= rdev
->mddev
->raid_disks
)
1913 rdev
->raid_disk
= slot
;
1914 /* assume it is working */
1916 set_bit(In_sync
, &rdev
->flags
);
1921 static struct rdev_sysfs_entry rdev_slot
=
1922 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
1925 offset_show(mdk_rdev_t
*rdev
, char *page
)
1927 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1931 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1934 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1935 if (e
==buf
|| (*e
&& *e
!= '\n'))
1937 if (rdev
->mddev
->pers
)
1939 rdev
->data_offset
= offset
;
1943 static struct rdev_sysfs_entry rdev_offset
=
1944 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
1947 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1949 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1953 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1956 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1957 if (e
==buf
|| (*e
&& *e
!= '\n'))
1959 if (rdev
->mddev
->pers
)
1962 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1963 rdev
->mddev
->size
= size
;
1967 static struct rdev_sysfs_entry rdev_size
=
1968 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
1970 static struct attribute
*rdev_default_attrs
[] = {
1980 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1982 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1983 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1987 return entry
->show(rdev
, page
);
1991 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1992 const char *page
, size_t length
)
1994 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1995 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1999 if (!capable(CAP_SYS_ADMIN
))
2001 return entry
->store(rdev
, page
, length
);
2004 static void rdev_free(struct kobject
*ko
)
2006 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2009 static struct sysfs_ops rdev_sysfs_ops
= {
2010 .show
= rdev_attr_show
,
2011 .store
= rdev_attr_store
,
2013 static struct kobj_type rdev_ktype
= {
2014 .release
= rdev_free
,
2015 .sysfs_ops
= &rdev_sysfs_ops
,
2016 .default_attrs
= rdev_default_attrs
,
2020 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2022 * mark the device faulty if:
2024 * - the device is nonexistent (zero size)
2025 * - the device has no valid superblock
2027 * a faulty rdev _never_ has rdev->sb set.
2029 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2031 char b
[BDEVNAME_SIZE
];
2036 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2038 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2039 return ERR_PTR(-ENOMEM
);
2042 if ((err
= alloc_disk_sb(rdev
)))
2045 err
= lock_rdev(rdev
, newdev
);
2049 rdev
->kobj
.parent
= NULL
;
2050 rdev
->kobj
.ktype
= &rdev_ktype
;
2051 kobject_init(&rdev
->kobj
);
2054 rdev
->saved_raid_disk
= -1;
2055 rdev
->raid_disk
= -1;
2057 rdev
->data_offset
= 0;
2058 rdev
->sb_events
= 0;
2059 atomic_set(&rdev
->nr_pending
, 0);
2060 atomic_set(&rdev
->read_errors
, 0);
2061 atomic_set(&rdev
->corrected_errors
, 0);
2063 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2066 "md: %s has zero or unknown size, marking faulty!\n",
2067 bdevname(rdev
->bdev
,b
));
2072 if (super_format
>= 0) {
2073 err
= super_types
[super_format
].
2074 load_super(rdev
, NULL
, super_minor
);
2075 if (err
== -EINVAL
) {
2077 "md: %s has invalid sb, not importing!\n",
2078 bdevname(rdev
->bdev
,b
));
2083 "md: could not read %s's sb, not importing!\n",
2084 bdevname(rdev
->bdev
,b
));
2088 INIT_LIST_HEAD(&rdev
->same_set
);
2093 if (rdev
->sb_page
) {
2099 return ERR_PTR(err
);
2103 * Check a full RAID array for plausibility
2107 static void analyze_sbs(mddev_t
* mddev
)
2110 struct list_head
*tmp
;
2111 mdk_rdev_t
*rdev
, *freshest
;
2112 char b
[BDEVNAME_SIZE
];
2115 ITERATE_RDEV(mddev
,rdev
,tmp
)
2116 switch (super_types
[mddev
->major_version
].
2117 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2125 "md: fatal superblock inconsistency in %s"
2126 " -- removing from array\n",
2127 bdevname(rdev
->bdev
,b
));
2128 kick_rdev_from_array(rdev
);
2132 super_types
[mddev
->major_version
].
2133 validate_super(mddev
, freshest
);
2136 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2137 if (rdev
!= freshest
)
2138 if (super_types
[mddev
->major_version
].
2139 validate_super(mddev
, rdev
)) {
2140 printk(KERN_WARNING
"md: kicking non-fresh %s"
2142 bdevname(rdev
->bdev
,b
));
2143 kick_rdev_from_array(rdev
);
2146 if (mddev
->level
== LEVEL_MULTIPATH
) {
2147 rdev
->desc_nr
= i
++;
2148 rdev
->raid_disk
= rdev
->desc_nr
;
2149 set_bit(In_sync
, &rdev
->flags
);
2150 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2151 rdev
->raid_disk
= -1;
2152 clear_bit(In_sync
, &rdev
->flags
);
2158 if (mddev
->recovery_cp
!= MaxSector
&&
2160 printk(KERN_ERR
"md: %s: raid array is not clean"
2161 " -- starting background reconstruction\n",
2167 safe_delay_show(mddev_t
*mddev
, char *page
)
2169 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2170 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2173 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2181 /* remove a period, and count digits after it */
2182 if (len
>= sizeof(buf
))
2184 strlcpy(buf
, cbuf
, len
);
2186 for (i
=0; i
<len
; i
++) {
2188 if (isdigit(buf
[i
])) {
2193 } else if (buf
[i
] == '.') {
2198 msec
= simple_strtoul(buf
, &e
, 10);
2199 if (e
== buf
|| (*e
&& *e
!= '\n'))
2201 msec
= (msec
* 1000) / scale
;
2203 mddev
->safemode_delay
= 0;
2205 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2206 if (mddev
->safemode_delay
== 0)
2207 mddev
->safemode_delay
= 1;
2211 static struct md_sysfs_entry md_safe_delay
=
2212 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2215 level_show(mddev_t
*mddev
, char *page
)
2217 struct mdk_personality
*p
= mddev
->pers
;
2219 return sprintf(page
, "%s\n", p
->name
);
2220 else if (mddev
->clevel
[0])
2221 return sprintf(page
, "%s\n", mddev
->clevel
);
2222 else if (mddev
->level
!= LEVEL_NONE
)
2223 return sprintf(page
, "%d\n", mddev
->level
);
2229 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2236 if (len
>= sizeof(mddev
->clevel
))
2238 strncpy(mddev
->clevel
, buf
, len
);
2239 if (mddev
->clevel
[len
-1] == '\n')
2241 mddev
->clevel
[len
] = 0;
2242 mddev
->level
= LEVEL_NONE
;
2246 static struct md_sysfs_entry md_level
=
2247 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2251 layout_show(mddev_t
*mddev
, char *page
)
2253 /* just a number, not meaningful for all levels */
2254 if (mddev
->reshape_position
!= MaxSector
&&
2255 mddev
->layout
!= mddev
->new_layout
)
2256 return sprintf(page
, "%d (%d)\n",
2257 mddev
->new_layout
, mddev
->layout
);
2258 return sprintf(page
, "%d\n", mddev
->layout
);
2262 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2265 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2267 if (!*buf
|| (*e
&& *e
!= '\n'))
2272 if (mddev
->reshape_position
!= MaxSector
)
2273 mddev
->new_layout
= n
;
2278 static struct md_sysfs_entry md_layout
=
2279 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2283 raid_disks_show(mddev_t
*mddev
, char *page
)
2285 if (mddev
->raid_disks
== 0)
2287 if (mddev
->reshape_position
!= MaxSector
&&
2288 mddev
->delta_disks
!= 0)
2289 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2290 mddev
->raid_disks
- mddev
->delta_disks
);
2291 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2294 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2297 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2301 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2303 if (!*buf
|| (*e
&& *e
!= '\n'))
2307 rv
= update_raid_disks(mddev
, n
);
2308 else if (mddev
->reshape_position
!= MaxSector
) {
2309 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2310 mddev
->delta_disks
= n
- olddisks
;
2311 mddev
->raid_disks
= n
;
2313 mddev
->raid_disks
= n
;
2314 return rv
? rv
: len
;
2316 static struct md_sysfs_entry md_raid_disks
=
2317 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2320 chunk_size_show(mddev_t
*mddev
, char *page
)
2322 if (mddev
->reshape_position
!= MaxSector
&&
2323 mddev
->chunk_size
!= mddev
->new_chunk
)
2324 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2326 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2330 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2332 /* can only set chunk_size if array is not yet active */
2334 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2336 if (!*buf
|| (*e
&& *e
!= '\n'))
2341 else if (mddev
->reshape_position
!= MaxSector
)
2342 mddev
->new_chunk
= n
;
2344 mddev
->chunk_size
= n
;
2347 static struct md_sysfs_entry md_chunk_size
=
2348 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2351 resync_start_show(mddev_t
*mddev
, char *page
)
2353 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2357 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2359 /* can only set chunk_size if array is not yet active */
2361 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2365 if (!*buf
|| (*e
&& *e
!= '\n'))
2368 mddev
->recovery_cp
= n
;
2371 static struct md_sysfs_entry md_resync_start
=
2372 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2375 * The array state can be:
2378 * No devices, no size, no level
2379 * Equivalent to STOP_ARRAY ioctl
2381 * May have some settings, but array is not active
2382 * all IO results in error
2383 * When written, doesn't tear down array, but just stops it
2384 * suspended (not supported yet)
2385 * All IO requests will block. The array can be reconfigured.
2386 * Writing this, if accepted, will block until array is quiessent
2388 * no resync can happen. no superblocks get written.
2389 * write requests fail
2391 * like readonly, but behaves like 'clean' on a write request.
2393 * clean - no pending writes, but otherwise active.
2394 * When written to inactive array, starts without resync
2395 * If a write request arrives then
2396 * if metadata is known, mark 'dirty' and switch to 'active'.
2397 * if not known, block and switch to write-pending
2398 * If written to an active array that has pending writes, then fails.
2400 * fully active: IO and resync can be happening.
2401 * When written to inactive array, starts with resync
2404 * clean, but writes are blocked waiting for 'active' to be written.
2407 * like active, but no writes have been seen for a while (100msec).
2410 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2411 write_pending
, active_idle
, bad_word
};
2412 static char *array_states
[] = {
2413 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2414 "write-pending", "active-idle", NULL
};
2416 static int match_word(const char *word
, char **list
)
2419 for (n
=0; list
[n
]; n
++)
2420 if (cmd_match(word
, list
[n
]))
2426 array_state_show(mddev_t
*mddev
, char *page
)
2428 enum array_state st
= inactive
;
2441 else if (mddev
->safemode
)
2447 if (list_empty(&mddev
->disks
) &&
2448 mddev
->raid_disks
== 0 &&
2454 return sprintf(page
, "%s\n", array_states
[st
]);
2457 static int do_md_stop(mddev_t
* mddev
, int ro
);
2458 static int do_md_run(mddev_t
* mddev
);
2459 static int restart_array(mddev_t
*mddev
);
2462 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2465 enum array_state st
= match_word(buf
, array_states
);
2470 /* stopping an active array */
2472 if (atomic_read(&mddev
->active
) > 1)
2474 err
= do_md_stop(mddev
, 0);
2478 /* stopping an active array */
2480 if (atomic_read(&mddev
->active
) > 1)
2482 err
= do_md_stop(mddev
, 2);
2486 break; /* not supported yet */
2489 err
= do_md_stop(mddev
, 1);
2492 err
= do_md_run(mddev
);
2496 /* stopping an active array */
2498 err
= do_md_stop(mddev
, 1);
2500 mddev
->ro
= 2; /* FIXME mark devices writable */
2503 err
= do_md_run(mddev
);
2508 restart_array(mddev
);
2509 spin_lock_irq(&mddev
->write_lock
);
2510 if (atomic_read(&mddev
->writes_pending
) == 0) {
2512 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2514 spin_unlock_irq(&mddev
->write_lock
);
2517 mddev
->recovery_cp
= MaxSector
;
2518 err
= do_md_run(mddev
);
2523 restart_array(mddev
);
2524 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2525 wake_up(&mddev
->sb_wait
);
2529 err
= do_md_run(mddev
);
2534 /* these cannot be set */
2542 static struct md_sysfs_entry md_array_state
=
2543 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2546 null_show(mddev_t
*mddev
, char *page
)
2552 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2554 /* buf must be %d:%d\n? giving major and minor numbers */
2555 /* The new device is added to the array.
2556 * If the array has a persistent superblock, we read the
2557 * superblock to initialise info and check validity.
2558 * Otherwise, only checking done is that in bind_rdev_to_array,
2559 * which mainly checks size.
2562 int major
= simple_strtoul(buf
, &e
, 10);
2568 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2570 minor
= simple_strtoul(e
+1, &e
, 10);
2571 if (*e
&& *e
!= '\n')
2573 dev
= MKDEV(major
, minor
);
2574 if (major
!= MAJOR(dev
) ||
2575 minor
!= MINOR(dev
))
2579 if (mddev
->persistent
) {
2580 rdev
= md_import_device(dev
, mddev
->major_version
,
2581 mddev
->minor_version
);
2582 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2583 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2584 mdk_rdev_t
, same_set
);
2585 err
= super_types
[mddev
->major_version
]
2586 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2591 rdev
= md_import_device(dev
, -1, -1);
2594 return PTR_ERR(rdev
);
2595 err
= bind_rdev_to_array(rdev
, mddev
);
2599 return err
? err
: len
;
2602 static struct md_sysfs_entry md_new_device
=
2603 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2606 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2609 unsigned long chunk
, end_chunk
;
2613 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2615 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2616 if (buf
== end
) break;
2617 if (*end
== '-') { /* range */
2619 end_chunk
= simple_strtoul(buf
, &end
, 0);
2620 if (buf
== end
) break;
2622 if (*end
&& !isspace(*end
)) break;
2623 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2625 while (isspace(*buf
)) buf
++;
2627 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2632 static struct md_sysfs_entry md_bitmap
=
2633 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2636 size_show(mddev_t
*mddev
, char *page
)
2638 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2641 static int update_size(mddev_t
*mddev
, unsigned long size
);
2644 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2646 /* If array is inactive, we can reduce the component size, but
2647 * not increase it (except from 0).
2648 * If array is active, we can try an on-line resize
2652 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2653 if (!*buf
|| *buf
== '\n' ||
2658 err
= update_size(mddev
, size
);
2659 md_update_sb(mddev
, 1);
2661 if (mddev
->size
== 0 ||
2667 return err
? err
: len
;
2670 static struct md_sysfs_entry md_size
=
2671 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2675 * This is either 'none' for arrays with externally managed metadata,
2676 * or N.M for internally known formats
2679 metadata_show(mddev_t
*mddev
, char *page
)
2681 if (mddev
->persistent
)
2682 return sprintf(page
, "%d.%d\n",
2683 mddev
->major_version
, mddev
->minor_version
);
2685 return sprintf(page
, "none\n");
2689 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2693 if (!list_empty(&mddev
->disks
))
2696 if (cmd_match(buf
, "none")) {
2697 mddev
->persistent
= 0;
2698 mddev
->major_version
= 0;
2699 mddev
->minor_version
= 90;
2702 major
= simple_strtoul(buf
, &e
, 10);
2703 if (e
==buf
|| *e
!= '.')
2706 minor
= simple_strtoul(buf
, &e
, 10);
2707 if (e
==buf
|| (*e
&& *e
!= '\n') )
2709 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2711 mddev
->major_version
= major
;
2712 mddev
->minor_version
= minor
;
2713 mddev
->persistent
= 1;
2717 static struct md_sysfs_entry md_metadata
=
2718 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2721 action_show(mddev_t
*mddev
, char *page
)
2723 char *type
= "idle";
2724 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2725 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2726 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2728 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2729 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2731 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2738 return sprintf(page
, "%s\n", type
);
2742 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2744 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2747 if (cmd_match(page
, "idle")) {
2748 if (mddev
->sync_thread
) {
2749 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2750 md_unregister_thread(mddev
->sync_thread
);
2751 mddev
->sync_thread
= NULL
;
2752 mddev
->recovery
= 0;
2754 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2755 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2757 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2758 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2759 else if (cmd_match(page
, "reshape")) {
2761 if (mddev
->pers
->start_reshape
== NULL
)
2763 err
= mddev
->pers
->start_reshape(mddev
);
2767 if (cmd_match(page
, "check"))
2768 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2769 else if (!cmd_match(page
, "repair"))
2771 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2772 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2774 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2775 md_wakeup_thread(mddev
->thread
);
2780 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2782 return sprintf(page
, "%llu\n",
2783 (unsigned long long) mddev
->resync_mismatches
);
2786 static struct md_sysfs_entry md_scan_mode
=
2787 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2790 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
2793 sync_min_show(mddev_t
*mddev
, char *page
)
2795 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2796 mddev
->sync_speed_min
? "local": "system");
2800 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2804 if (strncmp(buf
, "system", 6)==0) {
2805 mddev
->sync_speed_min
= 0;
2808 min
= simple_strtoul(buf
, &e
, 10);
2809 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2811 mddev
->sync_speed_min
= min
;
2815 static struct md_sysfs_entry md_sync_min
=
2816 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2819 sync_max_show(mddev_t
*mddev
, char *page
)
2821 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2822 mddev
->sync_speed_max
? "local": "system");
2826 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2830 if (strncmp(buf
, "system", 6)==0) {
2831 mddev
->sync_speed_max
= 0;
2834 max
= simple_strtoul(buf
, &e
, 10);
2835 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2837 mddev
->sync_speed_max
= max
;
2841 static struct md_sysfs_entry md_sync_max
=
2842 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2846 sync_speed_show(mddev_t
*mddev
, char *page
)
2848 unsigned long resync
, dt
, db
;
2849 resync
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
));
2850 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2852 db
= resync
- (mddev
->resync_mark_cnt
);
2853 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2856 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
2859 sync_completed_show(mddev_t
*mddev
, char *page
)
2861 unsigned long max_blocks
, resync
;
2863 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2864 max_blocks
= mddev
->resync_max_sectors
;
2866 max_blocks
= mddev
->size
<< 1;
2868 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2869 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2872 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
2875 suspend_lo_show(mddev_t
*mddev
, char *page
)
2877 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
2881 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2884 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2886 if (mddev
->pers
->quiesce
== NULL
)
2888 if (buf
== e
|| (*e
&& *e
!= '\n'))
2890 if (new >= mddev
->suspend_hi
||
2891 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
2892 mddev
->suspend_lo
= new;
2893 mddev
->pers
->quiesce(mddev
, 2);
2898 static struct md_sysfs_entry md_suspend_lo
=
2899 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
2903 suspend_hi_show(mddev_t
*mddev
, char *page
)
2905 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
2909 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2912 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2914 if (mddev
->pers
->quiesce
== NULL
)
2916 if (buf
== e
|| (*e
&& *e
!= '\n'))
2918 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
2919 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
2920 mddev
->suspend_hi
= new;
2921 mddev
->pers
->quiesce(mddev
, 1);
2922 mddev
->pers
->quiesce(mddev
, 0);
2927 static struct md_sysfs_entry md_suspend_hi
=
2928 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
2931 reshape_position_show(mddev_t
*mddev
, char *page
)
2933 if (mddev
->reshape_position
!= MaxSector
)
2934 return sprintf(page
, "%llu\n",
2935 (unsigned long long)mddev
->reshape_position
);
2936 strcpy(page
, "none\n");
2941 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2944 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2947 if (buf
== e
|| (*e
&& *e
!= '\n'))
2949 mddev
->reshape_position
= new;
2950 mddev
->delta_disks
= 0;
2951 mddev
->new_level
= mddev
->level
;
2952 mddev
->new_layout
= mddev
->layout
;
2953 mddev
->new_chunk
= mddev
->chunk_size
;
2957 static struct md_sysfs_entry md_reshape_position
=
2958 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
2959 reshape_position_store
);
2962 static struct attribute
*md_default_attrs
[] = {
2965 &md_raid_disks
.attr
,
2966 &md_chunk_size
.attr
,
2968 &md_resync_start
.attr
,
2970 &md_new_device
.attr
,
2971 &md_safe_delay
.attr
,
2972 &md_array_state
.attr
,
2973 &md_reshape_position
.attr
,
2977 static struct attribute
*md_redundancy_attrs
[] = {
2979 &md_mismatches
.attr
,
2982 &md_sync_speed
.attr
,
2983 &md_sync_completed
.attr
,
2984 &md_suspend_lo
.attr
,
2985 &md_suspend_hi
.attr
,
2989 static struct attribute_group md_redundancy_group
= {
2991 .attrs
= md_redundancy_attrs
,
2996 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2998 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2999 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3004 rv
= mddev_lock(mddev
);
3006 rv
= entry
->show(mddev
, page
);
3007 mddev_unlock(mddev
);
3013 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3014 const char *page
, size_t length
)
3016 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3017 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3022 if (!capable(CAP_SYS_ADMIN
))
3024 rv
= mddev_lock(mddev
);
3026 rv
= entry
->store(mddev
, page
, length
);
3027 mddev_unlock(mddev
);
3032 static void md_free(struct kobject
*ko
)
3034 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3038 static struct sysfs_ops md_sysfs_ops
= {
3039 .show
= md_attr_show
,
3040 .store
= md_attr_store
,
3042 static struct kobj_type md_ktype
= {
3044 .sysfs_ops
= &md_sysfs_ops
,
3045 .default_attrs
= md_default_attrs
,
3050 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3052 static DEFINE_MUTEX(disks_mutex
);
3053 mddev_t
*mddev
= mddev_find(dev
);
3054 struct gendisk
*disk
;
3055 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3056 int shift
= partitioned
? MdpMinorShift
: 0;
3057 int unit
= MINOR(dev
) >> shift
;
3062 mutex_lock(&disks_mutex
);
3063 if (mddev
->gendisk
) {
3064 mutex_unlock(&disks_mutex
);
3068 disk
= alloc_disk(1 << shift
);
3070 mutex_unlock(&disks_mutex
);
3074 disk
->major
= MAJOR(dev
);
3075 disk
->first_minor
= unit
<< shift
;
3077 sprintf(disk
->disk_name
, "md_d%d", unit
);
3079 sprintf(disk
->disk_name
, "md%d", unit
);
3080 disk
->fops
= &md_fops
;
3081 disk
->private_data
= mddev
;
3082 disk
->queue
= mddev
->queue
;
3084 mddev
->gendisk
= disk
;
3085 mutex_unlock(&disks_mutex
);
3086 mddev
->kobj
.parent
= &disk
->kobj
;
3087 mddev
->kobj
.k_name
= NULL
;
3088 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
3089 mddev
->kobj
.ktype
= &md_ktype
;
3090 if (kobject_register(&mddev
->kobj
))
3091 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3096 static void md_safemode_timeout(unsigned long data
)
3098 mddev_t
*mddev
= (mddev_t
*) data
;
3100 mddev
->safemode
= 1;
3101 md_wakeup_thread(mddev
->thread
);
3104 static int start_dirty_degraded
;
3106 static int do_md_run(mddev_t
* mddev
)
3110 struct list_head
*tmp
;
3112 struct gendisk
*disk
;
3113 struct mdk_personality
*pers
;
3114 char b
[BDEVNAME_SIZE
];
3116 if (list_empty(&mddev
->disks
))
3117 /* cannot run an array with no devices.. */
3124 * Analyze all RAID superblock(s)
3126 if (!mddev
->raid_disks
)
3129 chunk_size
= mddev
->chunk_size
;
3132 if (chunk_size
> MAX_CHUNK_SIZE
) {
3133 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3134 chunk_size
, MAX_CHUNK_SIZE
);
3138 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3140 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3141 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3144 if (chunk_size
< PAGE_SIZE
) {
3145 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3146 chunk_size
, PAGE_SIZE
);
3150 /* devices must have minimum size of one chunk */
3151 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3152 if (test_bit(Faulty
, &rdev
->flags
))
3154 if (rdev
->size
< chunk_size
/ 1024) {
3156 "md: Dev %s smaller than chunk_size:"
3158 bdevname(rdev
->bdev
,b
),
3159 (unsigned long long)rdev
->size
,
3167 if (mddev
->level
!= LEVEL_NONE
)
3168 request_module("md-level-%d", mddev
->level
);
3169 else if (mddev
->clevel
[0])
3170 request_module("md-%s", mddev
->clevel
);
3174 * Drop all container device buffers, from now on
3175 * the only valid external interface is through the md
3177 * Also find largest hardsector size
3179 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3180 if (test_bit(Faulty
, &rdev
->flags
))
3182 sync_blockdev(rdev
->bdev
);
3183 invalidate_bdev(rdev
->bdev
);
3186 md_probe(mddev
->unit
, NULL
, NULL
);
3187 disk
= mddev
->gendisk
;
3191 spin_lock(&pers_lock
);
3192 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3193 if (!pers
|| !try_module_get(pers
->owner
)) {
3194 spin_unlock(&pers_lock
);
3195 if (mddev
->level
!= LEVEL_NONE
)
3196 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3199 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3204 spin_unlock(&pers_lock
);
3205 mddev
->level
= pers
->level
;
3206 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3208 if (mddev
->reshape_position
!= MaxSector
&&
3209 pers
->start_reshape
== NULL
) {
3210 /* This personality cannot handle reshaping... */
3212 module_put(pers
->owner
);
3216 if (pers
->sync_request
) {
3217 /* Warn if this is a potentially silly
3220 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3222 struct list_head
*tmp2
;
3224 ITERATE_RDEV(mddev
, rdev
, tmp
) {
3225 ITERATE_RDEV(mddev
, rdev2
, tmp2
) {
3227 rdev
->bdev
->bd_contains
==
3228 rdev2
->bdev
->bd_contains
) {
3230 "%s: WARNING: %s appears to be"
3231 " on the same physical disk as"
3234 bdevname(rdev
->bdev
,b
),
3235 bdevname(rdev2
->bdev
,b2
));
3242 "True protection against single-disk"
3243 " failure might be compromised.\n");
3246 mddev
->recovery
= 0;
3247 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3248 mddev
->barriers_work
= 1;
3249 mddev
->ok_start_degraded
= start_dirty_degraded
;
3252 mddev
->ro
= 2; /* read-only, but switch on first write */
3254 err
= mddev
->pers
->run(mddev
);
3255 if (!err
&& mddev
->pers
->sync_request
) {
3256 err
= bitmap_create(mddev
);
3258 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3259 mdname(mddev
), err
);
3260 mddev
->pers
->stop(mddev
);
3264 printk(KERN_ERR
"md: pers->run() failed ...\n");
3265 module_put(mddev
->pers
->owner
);
3267 bitmap_destroy(mddev
);
3270 if (mddev
->pers
->sync_request
) {
3271 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3273 "md: cannot register extra attributes for %s\n",
3275 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3278 atomic_set(&mddev
->writes_pending
,0);
3279 mddev
->safemode
= 0;
3280 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3281 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3282 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3285 ITERATE_RDEV(mddev
,rdev
,tmp
)
3286 if (rdev
->raid_disk
>= 0) {
3288 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3289 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3290 printk("md: cannot register %s for %s\n",
3294 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3297 md_update_sb(mddev
, 0);
3299 set_capacity(disk
, mddev
->array_size
<<1);
3301 /* If we call blk_queue_make_request here, it will
3302 * re-initialise max_sectors etc which may have been
3303 * refined inside -> run. So just set the bits we need to set.
3304 * Most initialisation happended when we called
3305 * blk_queue_make_request(..., md_fail_request)
3308 mddev
->queue
->queuedata
= mddev
;
3309 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3311 /* If there is a partially-recovered drive we need to
3312 * start recovery here. If we leave it to md_check_recovery,
3313 * it will remove the drives and not do the right thing
3315 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3316 struct list_head
*rtmp
;
3318 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3319 if (rdev
->raid_disk
>= 0 &&
3320 !test_bit(In_sync
, &rdev
->flags
) &&
3321 !test_bit(Faulty
, &rdev
->flags
))
3322 /* complete an interrupted recovery */
3324 if (spares
&& mddev
->pers
->sync_request
) {
3325 mddev
->recovery
= 0;
3326 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3327 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3330 if (!mddev
->sync_thread
) {
3331 printk(KERN_ERR
"%s: could not start resync"
3334 /* leave the spares where they are, it shouldn't hurt */
3335 mddev
->recovery
= 0;
3339 md_wakeup_thread(mddev
->thread
);
3340 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3343 md_new_event(mddev
);
3344 kobject_uevent(&mddev
->gendisk
->kobj
, KOBJ_CHANGE
);
3348 static int restart_array(mddev_t
*mddev
)
3350 struct gendisk
*disk
= mddev
->gendisk
;
3354 * Complain if it has no devices
3357 if (list_empty(&mddev
->disks
))
3365 mddev
->safemode
= 0;
3367 set_disk_ro(disk
, 0);
3369 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3372 * Kick recovery or resync if necessary
3374 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3375 md_wakeup_thread(mddev
->thread
);
3376 md_wakeup_thread(mddev
->sync_thread
);
3385 /* similar to deny_write_access, but accounts for our holding a reference
3386 * to the file ourselves */
3387 static int deny_bitmap_write_access(struct file
* file
)
3389 struct inode
*inode
= file
->f_mapping
->host
;
3391 spin_lock(&inode
->i_lock
);
3392 if (atomic_read(&inode
->i_writecount
) > 1) {
3393 spin_unlock(&inode
->i_lock
);
3396 atomic_set(&inode
->i_writecount
, -1);
3397 spin_unlock(&inode
->i_lock
);
3402 static void restore_bitmap_write_access(struct file
*file
)
3404 struct inode
*inode
= file
->f_mapping
->host
;
3406 spin_lock(&inode
->i_lock
);
3407 atomic_set(&inode
->i_writecount
, 1);
3408 spin_unlock(&inode
->i_lock
);
3412 * 0 - completely stop and dis-assemble array
3413 * 1 - switch to readonly
3414 * 2 - stop but do not disassemble array
3416 static int do_md_stop(mddev_t
* mddev
, int mode
)
3419 struct gendisk
*disk
= mddev
->gendisk
;
3422 if (atomic_read(&mddev
->active
)>2) {
3423 printk("md: %s still in use.\n",mdname(mddev
));
3427 if (mddev
->sync_thread
) {
3428 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3429 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3430 md_unregister_thread(mddev
->sync_thread
);
3431 mddev
->sync_thread
= NULL
;
3434 del_timer_sync(&mddev
->safemode_timer
);
3436 invalidate_partition(disk
, 0);
3439 case 1: /* readonly */
3445 case 0: /* disassemble */
3447 bitmap_flush(mddev
);
3448 md_super_wait(mddev
);
3450 set_disk_ro(disk
, 0);
3451 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3452 mddev
->pers
->stop(mddev
);
3453 mddev
->queue
->merge_bvec_fn
= NULL
;
3454 mddev
->queue
->unplug_fn
= NULL
;
3455 mddev
->queue
->issue_flush_fn
= NULL
;
3456 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3457 if (mddev
->pers
->sync_request
)
3458 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3460 module_put(mddev
->pers
->owner
);
3463 set_capacity(disk
, 0);
3469 if (!mddev
->in_sync
|| mddev
->flags
) {
3470 /* mark array as shutdown cleanly */
3472 md_update_sb(mddev
, 1);
3475 set_disk_ro(disk
, 1);
3476 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3480 * Free resources if final stop
3484 struct list_head
*tmp
;
3486 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3488 bitmap_destroy(mddev
);
3489 if (mddev
->bitmap_file
) {
3490 restore_bitmap_write_access(mddev
->bitmap_file
);
3491 fput(mddev
->bitmap_file
);
3492 mddev
->bitmap_file
= NULL
;
3494 mddev
->bitmap_offset
= 0;
3496 ITERATE_RDEV(mddev
,rdev
,tmp
)
3497 if (rdev
->raid_disk
>= 0) {
3499 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3500 sysfs_remove_link(&mddev
->kobj
, nm
);
3503 /* make sure all delayed_delete calls have finished */
3504 flush_scheduled_work();
3506 export_array(mddev
);
3508 mddev
->array_size
= 0;
3510 mddev
->raid_disks
= 0;
3511 mddev
->recovery_cp
= 0;
3512 mddev
->reshape_position
= MaxSector
;
3514 } else if (mddev
->pers
)
3515 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3518 md_new_event(mddev
);
3524 static void autorun_array(mddev_t
*mddev
)
3527 struct list_head
*tmp
;
3530 if (list_empty(&mddev
->disks
))
3533 printk(KERN_INFO
"md: running: ");
3535 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3536 char b
[BDEVNAME_SIZE
];
3537 printk("<%s>", bdevname(rdev
->bdev
,b
));
3541 err
= do_md_run (mddev
);
3543 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3544 do_md_stop (mddev
, 0);
3549 * lets try to run arrays based on all disks that have arrived
3550 * until now. (those are in pending_raid_disks)
3552 * the method: pick the first pending disk, collect all disks with
3553 * the same UUID, remove all from the pending list and put them into
3554 * the 'same_array' list. Then order this list based on superblock
3555 * update time (freshest comes first), kick out 'old' disks and
3556 * compare superblocks. If everything's fine then run it.
3558 * If "unit" is allocated, then bump its reference count
3560 static void autorun_devices(int part
)
3562 struct list_head
*tmp
;
3563 mdk_rdev_t
*rdev0
, *rdev
;
3565 char b
[BDEVNAME_SIZE
];
3567 printk(KERN_INFO
"md: autorun ...\n");
3568 while (!list_empty(&pending_raid_disks
)) {
3571 LIST_HEAD(candidates
);
3572 rdev0
= list_entry(pending_raid_disks
.next
,
3573 mdk_rdev_t
, same_set
);
3575 printk(KERN_INFO
"md: considering %s ...\n",
3576 bdevname(rdev0
->bdev
,b
));
3577 INIT_LIST_HEAD(&candidates
);
3578 ITERATE_RDEV_PENDING(rdev
,tmp
)
3579 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3580 printk(KERN_INFO
"md: adding %s ...\n",
3581 bdevname(rdev
->bdev
,b
));
3582 list_move(&rdev
->same_set
, &candidates
);
3585 * now we have a set of devices, with all of them having
3586 * mostly sane superblocks. It's time to allocate the
3590 dev
= MKDEV(mdp_major
,
3591 rdev0
->preferred_minor
<< MdpMinorShift
);
3592 unit
= MINOR(dev
) >> MdpMinorShift
;
3594 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
3597 if (rdev0
->preferred_minor
!= unit
) {
3598 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
3599 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
3603 md_probe(dev
, NULL
, NULL
);
3604 mddev
= mddev_find(dev
);
3607 "md: cannot allocate memory for md drive.\n");
3610 if (mddev_lock(mddev
))
3611 printk(KERN_WARNING
"md: %s locked, cannot run\n",
3613 else if (mddev
->raid_disks
|| mddev
->major_version
3614 || !list_empty(&mddev
->disks
)) {
3616 "md: %s already running, cannot run %s\n",
3617 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
3618 mddev_unlock(mddev
);
3620 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
3621 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
3622 list_del_init(&rdev
->same_set
);
3623 if (bind_rdev_to_array(rdev
, mddev
))
3626 autorun_array(mddev
);
3627 mddev_unlock(mddev
);
3629 /* on success, candidates will be empty, on error
3632 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
3636 printk(KERN_INFO
"md: ... autorun DONE.\n");
3638 #endif /* !MODULE */
3640 static int get_version(void __user
* arg
)
3644 ver
.major
= MD_MAJOR_VERSION
;
3645 ver
.minor
= MD_MINOR_VERSION
;
3646 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3648 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3654 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3656 mdu_array_info_t info
;
3657 int nr
,working
,active
,failed
,spare
;
3659 struct list_head
*tmp
;
3661 nr
=working
=active
=failed
=spare
=0;
3662 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3664 if (test_bit(Faulty
, &rdev
->flags
))
3668 if (test_bit(In_sync
, &rdev
->flags
))
3675 info
.major_version
= mddev
->major_version
;
3676 info
.minor_version
= mddev
->minor_version
;
3677 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3678 info
.ctime
= mddev
->ctime
;
3679 info
.level
= mddev
->level
;
3680 info
.size
= mddev
->size
;
3681 if (info
.size
!= mddev
->size
) /* overflow */
3684 info
.raid_disks
= mddev
->raid_disks
;
3685 info
.md_minor
= mddev
->md_minor
;
3686 info
.not_persistent
= !mddev
->persistent
;
3688 info
.utime
= mddev
->utime
;
3691 info
.state
= (1<<MD_SB_CLEAN
);
3692 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3693 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3694 info
.active_disks
= active
;
3695 info
.working_disks
= working
;
3696 info
.failed_disks
= failed
;
3697 info
.spare_disks
= spare
;
3699 info
.layout
= mddev
->layout
;
3700 info
.chunk_size
= mddev
->chunk_size
;
3702 if (copy_to_user(arg
, &info
, sizeof(info
)))
3708 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3710 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3711 char *ptr
, *buf
= NULL
;
3714 md_allow_write(mddev
);
3716 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3720 /* bitmap disabled, zero the first byte and copy out */
3721 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3722 file
->pathname
[0] = '\0';
3726 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3730 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3734 strcpy(file
->pathname
, ptr
);
3738 if (copy_to_user(arg
, file
, sizeof(*file
)))
3746 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3748 mdu_disk_info_t info
;
3752 if (copy_from_user(&info
, arg
, sizeof(info
)))
3757 rdev
= find_rdev_nr(mddev
, nr
);
3759 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3760 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3761 info
.raid_disk
= rdev
->raid_disk
;
3763 if (test_bit(Faulty
, &rdev
->flags
))
3764 info
.state
|= (1<<MD_DISK_FAULTY
);
3765 else if (test_bit(In_sync
, &rdev
->flags
)) {
3766 info
.state
|= (1<<MD_DISK_ACTIVE
);
3767 info
.state
|= (1<<MD_DISK_SYNC
);
3769 if (test_bit(WriteMostly
, &rdev
->flags
))
3770 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3772 info
.major
= info
.minor
= 0;
3773 info
.raid_disk
= -1;
3774 info
.state
= (1<<MD_DISK_REMOVED
);
3777 if (copy_to_user(arg
, &info
, sizeof(info
)))
3783 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3785 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3787 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3789 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3792 if (!mddev
->raid_disks
) {
3794 /* expecting a device which has a superblock */
3795 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3798 "md: md_import_device returned %ld\n",
3800 return PTR_ERR(rdev
);
3802 if (!list_empty(&mddev
->disks
)) {
3803 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3804 mdk_rdev_t
, same_set
);
3805 int err
= super_types
[mddev
->major_version
]
3806 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3809 "md: %s has different UUID to %s\n",
3810 bdevname(rdev
->bdev
,b
),
3811 bdevname(rdev0
->bdev
,b2
));
3816 err
= bind_rdev_to_array(rdev
, mddev
);
3823 * add_new_disk can be used once the array is assembled
3824 * to add "hot spares". They must already have a superblock
3829 if (!mddev
->pers
->hot_add_disk
) {
3831 "%s: personality does not support diskops!\n",
3835 if (mddev
->persistent
)
3836 rdev
= md_import_device(dev
, mddev
->major_version
,
3837 mddev
->minor_version
);
3839 rdev
= md_import_device(dev
, -1, -1);
3842 "md: md_import_device returned %ld\n",
3844 return PTR_ERR(rdev
);
3846 /* set save_raid_disk if appropriate */
3847 if (!mddev
->persistent
) {
3848 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3849 info
->raid_disk
< mddev
->raid_disks
)
3850 rdev
->raid_disk
= info
->raid_disk
;
3852 rdev
->raid_disk
= -1;
3854 super_types
[mddev
->major_version
].
3855 validate_super(mddev
, rdev
);
3856 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3858 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3859 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3860 set_bit(WriteMostly
, &rdev
->flags
);
3862 rdev
->raid_disk
= -1;
3863 err
= bind_rdev_to_array(rdev
, mddev
);
3864 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
3865 /* If there is hot_add_disk but no hot_remove_disk
3866 * then added disks for geometry changes,
3867 * and should be added immediately.
3869 super_types
[mddev
->major_version
].
3870 validate_super(mddev
, rdev
);
3871 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
3873 unbind_rdev_from_array(rdev
);
3878 md_update_sb(mddev
, 1);
3879 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3880 md_wakeup_thread(mddev
->thread
);
3884 /* otherwise, add_new_disk is only allowed
3885 * for major_version==0 superblocks
3887 if (mddev
->major_version
!= 0) {
3888 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3893 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3895 rdev
= md_import_device (dev
, -1, 0);
3898 "md: error, md_import_device() returned %ld\n",
3900 return PTR_ERR(rdev
);
3902 rdev
->desc_nr
= info
->number
;
3903 if (info
->raid_disk
< mddev
->raid_disks
)
3904 rdev
->raid_disk
= info
->raid_disk
;
3906 rdev
->raid_disk
= -1;
3910 if (rdev
->raid_disk
< mddev
->raid_disks
)
3911 if (info
->state
& (1<<MD_DISK_SYNC
))
3912 set_bit(In_sync
, &rdev
->flags
);
3914 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3915 set_bit(WriteMostly
, &rdev
->flags
);
3917 if (!mddev
->persistent
) {
3918 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3919 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3921 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3922 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3924 err
= bind_rdev_to_array(rdev
, mddev
);
3934 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3936 char b
[BDEVNAME_SIZE
];
3942 rdev
= find_rdev(mddev
, dev
);
3946 if (rdev
->raid_disk
>= 0)
3949 kick_rdev_from_array(rdev
);
3950 md_update_sb(mddev
, 1);
3951 md_new_event(mddev
);
3955 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3956 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3960 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3962 char b
[BDEVNAME_SIZE
];
3970 if (mddev
->major_version
!= 0) {
3971 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3972 " version-0 superblocks.\n",
3976 if (!mddev
->pers
->hot_add_disk
) {
3978 "%s: personality does not support diskops!\n",
3983 rdev
= md_import_device (dev
, -1, 0);
3986 "md: error, md_import_device() returned %ld\n",
3991 if (mddev
->persistent
)
3992 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3995 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3997 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4000 if (test_bit(Faulty
, &rdev
->flags
)) {
4002 "md: can not hot-add faulty %s disk to %s!\n",
4003 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4007 clear_bit(In_sync
, &rdev
->flags
);
4009 rdev
->saved_raid_disk
= -1;
4010 err
= bind_rdev_to_array(rdev
, mddev
);
4015 * The rest should better be atomic, we can have disk failures
4016 * noticed in interrupt contexts ...
4019 if (rdev
->desc_nr
== mddev
->max_disks
) {
4020 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4023 goto abort_unbind_export
;
4026 rdev
->raid_disk
= -1;
4028 md_update_sb(mddev
, 1);
4031 * Kick recovery, maybe this spare has to be added to the
4032 * array immediately.
4034 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4035 md_wakeup_thread(mddev
->thread
);
4036 md_new_event(mddev
);
4039 abort_unbind_export
:
4040 unbind_rdev_from_array(rdev
);
4047 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4052 if (!mddev
->pers
->quiesce
)
4054 if (mddev
->recovery
|| mddev
->sync_thread
)
4056 /* we should be able to change the bitmap.. */
4062 return -EEXIST
; /* cannot add when bitmap is present */
4063 mddev
->bitmap_file
= fget(fd
);
4065 if (mddev
->bitmap_file
== NULL
) {
4066 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4071 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4073 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4075 fput(mddev
->bitmap_file
);
4076 mddev
->bitmap_file
= NULL
;
4079 mddev
->bitmap_offset
= 0; /* file overrides offset */
4080 } else if (mddev
->bitmap
== NULL
)
4081 return -ENOENT
; /* cannot remove what isn't there */
4084 mddev
->pers
->quiesce(mddev
, 1);
4086 err
= bitmap_create(mddev
);
4087 if (fd
< 0 || err
) {
4088 bitmap_destroy(mddev
);
4089 fd
= -1; /* make sure to put the file */
4091 mddev
->pers
->quiesce(mddev
, 0);
4094 if (mddev
->bitmap_file
) {
4095 restore_bitmap_write_access(mddev
->bitmap_file
);
4096 fput(mddev
->bitmap_file
);
4098 mddev
->bitmap_file
= NULL
;
4105 * set_array_info is used two different ways
4106 * The original usage is when creating a new array.
4107 * In this usage, raid_disks is > 0 and it together with
4108 * level, size, not_persistent,layout,chunksize determine the
4109 * shape of the array.
4110 * This will always create an array with a type-0.90.0 superblock.
4111 * The newer usage is when assembling an array.
4112 * In this case raid_disks will be 0, and the major_version field is
4113 * use to determine which style super-blocks are to be found on the devices.
4114 * The minor and patch _version numbers are also kept incase the
4115 * super_block handler wishes to interpret them.
4117 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4120 if (info
->raid_disks
== 0) {
4121 /* just setting version number for superblock loading */
4122 if (info
->major_version
< 0 ||
4123 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4124 super_types
[info
->major_version
].name
== NULL
) {
4125 /* maybe try to auto-load a module? */
4127 "md: superblock version %d not known\n",
4128 info
->major_version
);
4131 mddev
->major_version
= info
->major_version
;
4132 mddev
->minor_version
= info
->minor_version
;
4133 mddev
->patch_version
= info
->patch_version
;
4134 mddev
->persistent
= !info
->not_persistent
;
4137 mddev
->major_version
= MD_MAJOR_VERSION
;
4138 mddev
->minor_version
= MD_MINOR_VERSION
;
4139 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4140 mddev
->ctime
= get_seconds();
4142 mddev
->level
= info
->level
;
4143 mddev
->clevel
[0] = 0;
4144 mddev
->size
= info
->size
;
4145 mddev
->raid_disks
= info
->raid_disks
;
4146 /* don't set md_minor, it is determined by which /dev/md* was
4149 if (info
->state
& (1<<MD_SB_CLEAN
))
4150 mddev
->recovery_cp
= MaxSector
;
4152 mddev
->recovery_cp
= 0;
4153 mddev
->persistent
= ! info
->not_persistent
;
4155 mddev
->layout
= info
->layout
;
4156 mddev
->chunk_size
= info
->chunk_size
;
4158 mddev
->max_disks
= MD_SB_DISKS
;
4161 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4163 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4164 mddev
->bitmap_offset
= 0;
4166 mddev
->reshape_position
= MaxSector
;
4169 * Generate a 128 bit UUID
4171 get_random_bytes(mddev
->uuid
, 16);
4173 mddev
->new_level
= mddev
->level
;
4174 mddev
->new_chunk
= mddev
->chunk_size
;
4175 mddev
->new_layout
= mddev
->layout
;
4176 mddev
->delta_disks
= 0;
4181 static int update_size(mddev_t
*mddev
, unsigned long size
)
4185 struct list_head
*tmp
;
4186 int fit
= (size
== 0);
4188 if (mddev
->pers
->resize
== NULL
)
4190 /* The "size" is the amount of each device that is used.
4191 * This can only make sense for arrays with redundancy.
4192 * linear and raid0 always use whatever space is available
4193 * We can only consider changing the size if no resync
4194 * or reconstruction is happening, and if the new size
4195 * is acceptable. It must fit before the sb_offset or,
4196 * if that is <data_offset, it must fit before the
4197 * size of each device.
4198 * If size is zero, we find the largest size that fits.
4200 if (mddev
->sync_thread
)
4202 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4204 avail
= rdev
->size
* 2;
4206 if (fit
&& (size
== 0 || size
> avail
/2))
4208 if (avail
< ((sector_t
)size
<< 1))
4211 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4213 struct block_device
*bdev
;
4215 bdev
= bdget_disk(mddev
->gendisk
, 0);
4217 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4218 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4219 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4226 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4229 /* change the number of raid disks */
4230 if (mddev
->pers
->check_reshape
== NULL
)
4232 if (raid_disks
<= 0 ||
4233 raid_disks
>= mddev
->max_disks
)
4235 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4237 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4239 rv
= mddev
->pers
->check_reshape(mddev
);
4245 * update_array_info is used to change the configuration of an
4247 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4248 * fields in the info are checked against the array.
4249 * Any differences that cannot be handled will cause an error.
4250 * Normally, only one change can be managed at a time.
4252 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4258 /* calculate expected state,ignoring low bits */
4259 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4260 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4262 if (mddev
->major_version
!= info
->major_version
||
4263 mddev
->minor_version
!= info
->minor_version
||
4264 /* mddev->patch_version != info->patch_version || */
4265 mddev
->ctime
!= info
->ctime
||
4266 mddev
->level
!= info
->level
||
4267 /* mddev->layout != info->layout || */
4268 !mddev
->persistent
!= info
->not_persistent
||
4269 mddev
->chunk_size
!= info
->chunk_size
||
4270 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4271 ((state
^info
->state
) & 0xfffffe00)
4274 /* Check there is only one change */
4275 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4276 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4277 if (mddev
->layout
!= info
->layout
) cnt
++;
4278 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4279 if (cnt
== 0) return 0;
4280 if (cnt
> 1) return -EINVAL
;
4282 if (mddev
->layout
!= info
->layout
) {
4284 * we don't need to do anything at the md level, the
4285 * personality will take care of it all.
4287 if (mddev
->pers
->reconfig
== NULL
)
4290 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4292 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4293 rv
= update_size(mddev
, info
->size
);
4295 if (mddev
->raid_disks
!= info
->raid_disks
)
4296 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4298 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4299 if (mddev
->pers
->quiesce
== NULL
)
4301 if (mddev
->recovery
|| mddev
->sync_thread
)
4303 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4304 /* add the bitmap */
4307 if (mddev
->default_bitmap_offset
== 0)
4309 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4310 mddev
->pers
->quiesce(mddev
, 1);
4311 rv
= bitmap_create(mddev
);
4313 bitmap_destroy(mddev
);
4314 mddev
->pers
->quiesce(mddev
, 0);
4316 /* remove the bitmap */
4319 if (mddev
->bitmap
->file
)
4321 mddev
->pers
->quiesce(mddev
, 1);
4322 bitmap_destroy(mddev
);
4323 mddev
->pers
->quiesce(mddev
, 0);
4324 mddev
->bitmap_offset
= 0;
4327 md_update_sb(mddev
, 1);
4331 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4335 if (mddev
->pers
== NULL
)
4338 rdev
= find_rdev(mddev
, dev
);
4342 md_error(mddev
, rdev
);
4346 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4348 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4352 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4356 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4357 unsigned int cmd
, unsigned long arg
)
4360 void __user
*argp
= (void __user
*)arg
;
4361 mddev_t
*mddev
= NULL
;
4363 if (!capable(CAP_SYS_ADMIN
))
4367 * Commands dealing with the RAID driver but not any
4373 err
= get_version(argp
);
4376 case PRINT_RAID_DEBUG
:
4384 autostart_arrays(arg
);
4391 * Commands creating/starting a new array:
4394 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4401 err
= mddev_lock(mddev
);
4404 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4411 case SET_ARRAY_INFO
:
4413 mdu_array_info_t info
;
4415 memset(&info
, 0, sizeof(info
));
4416 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4421 err
= update_array_info(mddev
, &info
);
4423 printk(KERN_WARNING
"md: couldn't update"
4424 " array info. %d\n", err
);
4429 if (!list_empty(&mddev
->disks
)) {
4431 "md: array %s already has disks!\n",
4436 if (mddev
->raid_disks
) {
4438 "md: array %s already initialised!\n",
4443 err
= set_array_info(mddev
, &info
);
4445 printk(KERN_WARNING
"md: couldn't set"
4446 " array info. %d\n", err
);
4456 * Commands querying/configuring an existing array:
4458 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4459 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4460 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4461 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4462 && cmd
!= GET_BITMAP_FILE
) {
4468 * Commands even a read-only array can execute:
4472 case GET_ARRAY_INFO
:
4473 err
= get_array_info(mddev
, argp
);
4476 case GET_BITMAP_FILE
:
4477 err
= get_bitmap_file(mddev
, argp
);
4481 err
= get_disk_info(mddev
, argp
);
4484 case RESTART_ARRAY_RW
:
4485 err
= restart_array(mddev
);
4489 err
= do_md_stop (mddev
, 0);
4493 err
= do_md_stop (mddev
, 1);
4497 * We have a problem here : there is no easy way to give a CHS
4498 * virtual geometry. We currently pretend that we have a 2 heads
4499 * 4 sectors (with a BIG number of cylinders...). This drives
4500 * dosfs just mad... ;-)
4505 * The remaining ioctls are changing the state of the
4506 * superblock, so we do not allow them on read-only arrays.
4507 * However non-MD ioctls (e.g. get-size) will still come through
4508 * here and hit the 'default' below, so only disallow
4509 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4511 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
4512 mddev
->ro
&& mddev
->pers
) {
4513 if (mddev
->ro
== 2) {
4515 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4516 md_wakeup_thread(mddev
->thread
);
4528 mdu_disk_info_t info
;
4529 if (copy_from_user(&info
, argp
, sizeof(info
)))
4532 err
= add_new_disk(mddev
, &info
);
4536 case HOT_REMOVE_DISK
:
4537 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4541 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4544 case SET_DISK_FAULTY
:
4545 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4549 err
= do_md_run (mddev
);
4552 case SET_BITMAP_FILE
:
4553 err
= set_bitmap_file(mddev
, (int)arg
);
4563 mddev_unlock(mddev
);
4573 static int md_open(struct inode
*inode
, struct file
*file
)
4576 * Succeed if we can lock the mddev, which confirms that
4577 * it isn't being stopped right now.
4579 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4582 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
4587 mddev_unlock(mddev
);
4589 check_disk_change(inode
->i_bdev
);
4594 static int md_release(struct inode
*inode
, struct file
* file
)
4596 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4604 static int md_media_changed(struct gendisk
*disk
)
4606 mddev_t
*mddev
= disk
->private_data
;
4608 return mddev
->changed
;
4611 static int md_revalidate(struct gendisk
*disk
)
4613 mddev_t
*mddev
= disk
->private_data
;
4618 static struct block_device_operations md_fops
=
4620 .owner
= THIS_MODULE
,
4622 .release
= md_release
,
4624 .getgeo
= md_getgeo
,
4625 .media_changed
= md_media_changed
,
4626 .revalidate_disk
= md_revalidate
,
4629 static int md_thread(void * arg
)
4631 mdk_thread_t
*thread
= arg
;
4634 * md_thread is a 'system-thread', it's priority should be very
4635 * high. We avoid resource deadlocks individually in each
4636 * raid personality. (RAID5 does preallocation) We also use RR and
4637 * the very same RT priority as kswapd, thus we will never get
4638 * into a priority inversion deadlock.
4640 * we definitely have to have equal or higher priority than
4641 * bdflush, otherwise bdflush will deadlock if there are too
4642 * many dirty RAID5 blocks.
4645 current
->flags
|= PF_NOFREEZE
;
4646 allow_signal(SIGKILL
);
4647 while (!kthread_should_stop()) {
4649 /* We need to wait INTERRUPTIBLE so that
4650 * we don't add to the load-average.
4651 * That means we need to be sure no signals are
4654 if (signal_pending(current
))
4655 flush_signals(current
);
4657 wait_event_interruptible_timeout
4659 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4660 || kthread_should_stop(),
4663 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4665 thread
->run(thread
->mddev
);
4671 void md_wakeup_thread(mdk_thread_t
*thread
)
4674 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4675 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4676 wake_up(&thread
->wqueue
);
4680 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4683 mdk_thread_t
*thread
;
4685 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4689 init_waitqueue_head(&thread
->wqueue
);
4692 thread
->mddev
= mddev
;
4693 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4694 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4695 if (IS_ERR(thread
->tsk
)) {
4702 void md_unregister_thread(mdk_thread_t
*thread
)
4704 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
4706 kthread_stop(thread
->tsk
);
4710 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4717 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4720 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4722 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4723 __builtin_return_address(0),__builtin_return_address(1),
4724 __builtin_return_address(2),__builtin_return_address(3));
4728 if (!mddev
->pers
->error_handler
)
4730 mddev
->pers
->error_handler(mddev
,rdev
);
4731 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4732 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4733 md_wakeup_thread(mddev
->thread
);
4734 md_new_event_inintr(mddev
);
4737 /* seq_file implementation /proc/mdstat */
4739 static void status_unused(struct seq_file
*seq
)
4743 struct list_head
*tmp
;
4745 seq_printf(seq
, "unused devices: ");
4747 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4748 char b
[BDEVNAME_SIZE
];
4750 seq_printf(seq
, "%s ",
4751 bdevname(rdev
->bdev
,b
));
4754 seq_printf(seq
, "<none>");
4756 seq_printf(seq
, "\n");
4760 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4762 sector_t max_blocks
, resync
, res
;
4763 unsigned long dt
, db
, rt
;
4765 unsigned int per_milli
;
4767 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4769 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4770 max_blocks
= mddev
->resync_max_sectors
>> 1;
4772 max_blocks
= mddev
->size
;
4775 * Should not happen.
4781 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4782 * in a sector_t, and (max_blocks>>scale) will fit in a
4783 * u32, as those are the requirements for sector_div.
4784 * Thus 'scale' must be at least 10
4787 if (sizeof(sector_t
) > sizeof(unsigned long)) {
4788 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
4791 res
= (resync
>>scale
)*1000;
4792 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
4796 int i
, x
= per_milli
/50, y
= 20-x
;
4797 seq_printf(seq
, "[");
4798 for (i
= 0; i
< x
; i
++)
4799 seq_printf(seq
, "=");
4800 seq_printf(seq
, ">");
4801 for (i
= 0; i
< y
; i
++)
4802 seq_printf(seq
, ".");
4803 seq_printf(seq
, "] ");
4805 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
4806 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
4808 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
4810 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4811 "resync" : "recovery"))),
4812 per_milli
/10, per_milli
% 10,
4813 (unsigned long long) resync
,
4814 (unsigned long long) max_blocks
);
4817 * We do not want to overflow, so the order of operands and
4818 * the * 100 / 100 trick are important. We do a +1 to be
4819 * safe against division by zero. We only estimate anyway.
4821 * dt: time from mark until now
4822 * db: blocks written from mark until now
4823 * rt: remaining time
4825 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4827 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
4828 - mddev
->resync_mark_cnt
;
4829 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
4831 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4833 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
4836 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4838 struct list_head
*tmp
;
4848 spin_lock(&all_mddevs_lock
);
4849 list_for_each(tmp
,&all_mddevs
)
4851 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4853 spin_unlock(&all_mddevs_lock
);
4856 spin_unlock(&all_mddevs_lock
);
4858 return (void*)2;/* tail */
4862 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4864 struct list_head
*tmp
;
4865 mddev_t
*next_mddev
, *mddev
= v
;
4871 spin_lock(&all_mddevs_lock
);
4873 tmp
= all_mddevs
.next
;
4875 tmp
= mddev
->all_mddevs
.next
;
4876 if (tmp
!= &all_mddevs
)
4877 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4879 next_mddev
= (void*)2;
4882 spin_unlock(&all_mddevs_lock
);
4890 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4894 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4898 struct mdstat_info
{
4902 static int md_seq_show(struct seq_file
*seq
, void *v
)
4906 struct list_head
*tmp2
;
4908 struct mdstat_info
*mi
= seq
->private;
4909 struct bitmap
*bitmap
;
4911 if (v
== (void*)1) {
4912 struct mdk_personality
*pers
;
4913 seq_printf(seq
, "Personalities : ");
4914 spin_lock(&pers_lock
);
4915 list_for_each_entry(pers
, &pers_list
, list
)
4916 seq_printf(seq
, "[%s] ", pers
->name
);
4918 spin_unlock(&pers_lock
);
4919 seq_printf(seq
, "\n");
4920 mi
->event
= atomic_read(&md_event_count
);
4923 if (v
== (void*)2) {
4928 if (mddev_lock(mddev
) < 0)
4931 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4932 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4933 mddev
->pers
? "" : "in");
4936 seq_printf(seq
, " (read-only)");
4938 seq_printf(seq
, "(auto-read-only)");
4939 seq_printf(seq
, " %s", mddev
->pers
->name
);
4943 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4944 char b
[BDEVNAME_SIZE
];
4945 seq_printf(seq
, " %s[%d]",
4946 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4947 if (test_bit(WriteMostly
, &rdev
->flags
))
4948 seq_printf(seq
, "(W)");
4949 if (test_bit(Faulty
, &rdev
->flags
)) {
4950 seq_printf(seq
, "(F)");
4952 } else if (rdev
->raid_disk
< 0)
4953 seq_printf(seq
, "(S)"); /* spare */
4957 if (!list_empty(&mddev
->disks
)) {
4959 seq_printf(seq
, "\n %llu blocks",
4960 (unsigned long long)mddev
->array_size
);
4962 seq_printf(seq
, "\n %llu blocks",
4963 (unsigned long long)size
);
4965 if (mddev
->persistent
) {
4966 if (mddev
->major_version
!= 0 ||
4967 mddev
->minor_version
!= 90) {
4968 seq_printf(seq
," super %d.%d",
4969 mddev
->major_version
,
4970 mddev
->minor_version
);
4973 seq_printf(seq
, " super non-persistent");
4976 mddev
->pers
->status (seq
, mddev
);
4977 seq_printf(seq
, "\n ");
4978 if (mddev
->pers
->sync_request
) {
4979 if (mddev
->curr_resync
> 2) {
4980 status_resync (seq
, mddev
);
4981 seq_printf(seq
, "\n ");
4982 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4983 seq_printf(seq
, "\tresync=DELAYED\n ");
4984 else if (mddev
->recovery_cp
< MaxSector
)
4985 seq_printf(seq
, "\tresync=PENDING\n ");
4988 seq_printf(seq
, "\n ");
4990 if ((bitmap
= mddev
->bitmap
)) {
4991 unsigned long chunk_kb
;
4992 unsigned long flags
;
4993 spin_lock_irqsave(&bitmap
->lock
, flags
);
4994 chunk_kb
= bitmap
->chunksize
>> 10;
4995 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4997 bitmap
->pages
- bitmap
->missing_pages
,
4999 (bitmap
->pages
- bitmap
->missing_pages
)
5000 << (PAGE_SHIFT
- 10),
5001 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5002 chunk_kb
? "KB" : "B");
5004 seq_printf(seq
, ", file: ");
5005 seq_path(seq
, bitmap
->file
->f_path
.mnt
,
5006 bitmap
->file
->f_path
.dentry
," \t\n");
5009 seq_printf(seq
, "\n");
5010 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5013 seq_printf(seq
, "\n");
5015 mddev_unlock(mddev
);
5020 static struct seq_operations md_seq_ops
= {
5021 .start
= md_seq_start
,
5022 .next
= md_seq_next
,
5023 .stop
= md_seq_stop
,
5024 .show
= md_seq_show
,
5027 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5030 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5034 error
= seq_open(file
, &md_seq_ops
);
5038 struct seq_file
*p
= file
->private_data
;
5040 mi
->event
= atomic_read(&md_event_count
);
5045 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5047 struct seq_file
*m
= filp
->private_data
;
5048 struct mdstat_info
*mi
= m
->private;
5051 poll_wait(filp
, &md_event_waiters
, wait
);
5053 /* always allow read */
5054 mask
= POLLIN
| POLLRDNORM
;
5056 if (mi
->event
!= atomic_read(&md_event_count
))
5057 mask
|= POLLERR
| POLLPRI
;
5061 static const struct file_operations md_seq_fops
= {
5062 .owner
= THIS_MODULE
,
5063 .open
= md_seq_open
,
5065 .llseek
= seq_lseek
,
5066 .release
= seq_release_private
,
5067 .poll
= mdstat_poll
,
5070 int register_md_personality(struct mdk_personality
*p
)
5072 spin_lock(&pers_lock
);
5073 list_add_tail(&p
->list
, &pers_list
);
5074 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5075 spin_unlock(&pers_lock
);
5079 int unregister_md_personality(struct mdk_personality
*p
)
5081 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5082 spin_lock(&pers_lock
);
5083 list_del_init(&p
->list
);
5084 spin_unlock(&pers_lock
);
5088 static int is_mddev_idle(mddev_t
*mddev
)
5091 struct list_head
*tmp
;
5093 unsigned long curr_events
;
5096 ITERATE_RDEV(mddev
,rdev
,tmp
) {
5097 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5098 curr_events
= disk_stat_read(disk
, sectors
[0]) +
5099 disk_stat_read(disk
, sectors
[1]) -
5100 atomic_read(&disk
->sync_io
);
5101 /* The difference between curr_events and last_events
5102 * will be affected by any new non-sync IO (making
5103 * curr_events bigger) and any difference in the amount of
5104 * in-flight syncio (making current_events bigger or smaller)
5105 * The amount in-flight is currently limited to
5106 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
5107 * which is at most 4096 sectors.
5108 * These numbers are fairly fragile and should be made
5109 * more robust, probably by enforcing the
5110 * 'window size' that md_do_sync sort-of uses.
5112 * Note: the following is an unsigned comparison.
5114 if ((long)curr_events
- (long)rdev
->last_events
> 4096) {
5115 rdev
->last_events
= curr_events
;
5122 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5124 /* another "blocks" (512byte) blocks have been synced */
5125 atomic_sub(blocks
, &mddev
->recovery_active
);
5126 wake_up(&mddev
->recovery_wait
);
5128 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5129 md_wakeup_thread(mddev
->thread
);
5130 // stop recovery, signal do_sync ....
5135 /* md_write_start(mddev, bi)
5136 * If we need to update some array metadata (e.g. 'active' flag
5137 * in superblock) before writing, schedule a superblock update
5138 * and wait for it to complete.
5140 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5142 if (bio_data_dir(bi
) != WRITE
)
5145 BUG_ON(mddev
->ro
== 1);
5146 if (mddev
->ro
== 2) {
5147 /* need to switch to read/write */
5149 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5150 md_wakeup_thread(mddev
->thread
);
5152 atomic_inc(&mddev
->writes_pending
);
5153 if (mddev
->in_sync
) {
5154 spin_lock_irq(&mddev
->write_lock
);
5155 if (mddev
->in_sync
) {
5157 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5158 md_wakeup_thread(mddev
->thread
);
5160 spin_unlock_irq(&mddev
->write_lock
);
5162 wait_event(mddev
->sb_wait
, mddev
->flags
==0);
5165 void md_write_end(mddev_t
*mddev
)
5167 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5168 if (mddev
->safemode
== 2)
5169 md_wakeup_thread(mddev
->thread
);
5170 else if (mddev
->safemode_delay
)
5171 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5175 /* md_allow_write(mddev)
5176 * Calling this ensures that the array is marked 'active' so that writes
5177 * may proceed without blocking. It is important to call this before
5178 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5179 * Must be called with mddev_lock held.
5181 void md_allow_write(mddev_t
*mddev
)
5188 spin_lock_irq(&mddev
->write_lock
);
5189 if (mddev
->in_sync
) {
5191 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5192 if (mddev
->safemode_delay
&&
5193 mddev
->safemode
== 0)
5194 mddev
->safemode
= 1;
5195 spin_unlock_irq(&mddev
->write_lock
);
5196 md_update_sb(mddev
, 0);
5198 spin_unlock_irq(&mddev
->write_lock
);
5200 EXPORT_SYMBOL_GPL(md_allow_write
);
5202 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
5204 #define SYNC_MARKS 10
5205 #define SYNC_MARK_STEP (3*HZ)
5206 void md_do_sync(mddev_t
*mddev
)
5209 unsigned int currspeed
= 0,
5211 sector_t max_sectors
,j
, io_sectors
;
5212 unsigned long mark
[SYNC_MARKS
];
5213 sector_t mark_cnt
[SYNC_MARKS
];
5215 struct list_head
*tmp
;
5216 sector_t last_check
;
5218 struct list_head
*rtmp
;
5222 /* just incase thread restarts... */
5223 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5225 if (mddev
->ro
) /* never try to sync a read-only array */
5228 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5229 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5230 desc
= "data-check";
5231 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5232 desc
= "requested-resync";
5235 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5240 /* we overload curr_resync somewhat here.
5241 * 0 == not engaged in resync at all
5242 * 2 == checking that there is no conflict with another sync
5243 * 1 == like 2, but have yielded to allow conflicting resync to
5245 * other == active in resync - this many blocks
5247 * Before starting a resync we must have set curr_resync to
5248 * 2, and then checked that every "conflicting" array has curr_resync
5249 * less than ours. When we find one that is the same or higher
5250 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5251 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5252 * This will mean we have to start checking from the beginning again.
5257 mddev
->curr_resync
= 2;
5260 if (kthread_should_stop()) {
5261 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5264 ITERATE_MDDEV(mddev2
,tmp
) {
5265 if (mddev2
== mddev
)
5267 if (mddev2
->curr_resync
&&
5268 match_mddev_units(mddev
,mddev2
)) {
5270 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5271 /* arbitrarily yield */
5272 mddev
->curr_resync
= 1;
5273 wake_up(&resync_wait
);
5275 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5276 /* no need to wait here, we can wait the next
5277 * time 'round when curr_resync == 2
5280 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5281 if (!kthread_should_stop() &&
5282 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5283 printk(KERN_INFO
"md: delaying %s of %s"
5284 " until %s has finished (they"
5285 " share one or more physical units)\n",
5286 desc
, mdname(mddev
), mdname(mddev2
));
5289 finish_wait(&resync_wait
, &wq
);
5292 finish_wait(&resync_wait
, &wq
);
5295 } while (mddev
->curr_resync
< 2);
5298 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5299 /* resync follows the size requested by the personality,
5300 * which defaults to physical size, but can be virtual size
5302 max_sectors
= mddev
->resync_max_sectors
;
5303 mddev
->resync_mismatches
= 0;
5304 /* we don't use the checkpoint if there's a bitmap */
5305 if (!mddev
->bitmap
&&
5306 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5307 j
= mddev
->recovery_cp
;
5308 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5309 max_sectors
= mddev
->size
<< 1;
5311 /* recovery follows the physical size of devices */
5312 max_sectors
= mddev
->size
<< 1;
5314 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5315 if (rdev
->raid_disk
>= 0 &&
5316 !test_bit(Faulty
, &rdev
->flags
) &&
5317 !test_bit(In_sync
, &rdev
->flags
) &&
5318 rdev
->recovery_offset
< j
)
5319 j
= rdev
->recovery_offset
;
5322 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5323 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5324 " %d KB/sec/disk.\n", speed_min(mddev
));
5325 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5326 "(but not more than %d KB/sec) for %s.\n",
5327 speed_max(mddev
), desc
);
5329 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5332 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5334 mark_cnt
[m
] = io_sectors
;
5337 mddev
->resync_mark
= mark
[last_mark
];
5338 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5341 * Tune reconstruction:
5343 window
= 32*(PAGE_SIZE
/512);
5344 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5345 window
/2,(unsigned long long) max_sectors
/2);
5347 atomic_set(&mddev
->recovery_active
, 0);
5348 init_waitqueue_head(&mddev
->recovery_wait
);
5353 "md: resuming %s of %s from checkpoint.\n",
5354 desc
, mdname(mddev
));
5355 mddev
->curr_resync
= j
;
5358 while (j
< max_sectors
) {
5362 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5363 currspeed
< speed_min(mddev
));
5365 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5369 if (!skipped
) { /* actual IO requested */
5370 io_sectors
+= sectors
;
5371 atomic_add(sectors
, &mddev
->recovery_active
);
5375 if (j
>1) mddev
->curr_resync
= j
;
5376 mddev
->curr_mark_cnt
= io_sectors
;
5377 if (last_check
== 0)
5378 /* this is the earliers that rebuilt will be
5379 * visible in /proc/mdstat
5381 md_new_event(mddev
);
5383 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5386 last_check
= io_sectors
;
5388 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
5389 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
5393 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5395 int next
= (last_mark
+1) % SYNC_MARKS
;
5397 mddev
->resync_mark
= mark
[next
];
5398 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5399 mark
[next
] = jiffies
;
5400 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5405 if (kthread_should_stop()) {
5407 * got a signal, exit.
5410 "md: md_do_sync() got signal ... exiting\n");
5411 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5416 * this loop exits only if either when we are slower than
5417 * the 'hard' speed limit, or the system was IO-idle for
5419 * the system might be non-idle CPU-wise, but we only care
5420 * about not overloading the IO subsystem. (things like an
5421 * e2fsck being done on the RAID array should execute fast)
5423 mddev
->queue
->unplug_fn(mddev
->queue
);
5426 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5427 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5429 if (currspeed
> speed_min(mddev
)) {
5430 if ((currspeed
> speed_max(mddev
)) ||
5431 !is_mddev_idle(mddev
)) {
5437 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5439 * this also signals 'finished resyncing' to md_stop
5442 mddev
->queue
->unplug_fn(mddev
->queue
);
5444 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5446 /* tell personality that we are finished */
5447 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5449 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5450 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5451 mddev
->curr_resync
> 2) {
5452 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5453 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5454 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5456 "md: checkpointing %s of %s.\n",
5457 desc
, mdname(mddev
));
5458 mddev
->recovery_cp
= mddev
->curr_resync
;
5461 mddev
->recovery_cp
= MaxSector
;
5463 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5464 mddev
->curr_resync
= MaxSector
;
5465 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5466 if (rdev
->raid_disk
>= 0 &&
5467 !test_bit(Faulty
, &rdev
->flags
) &&
5468 !test_bit(In_sync
, &rdev
->flags
) &&
5469 rdev
->recovery_offset
< mddev
->curr_resync
)
5470 rdev
->recovery_offset
= mddev
->curr_resync
;
5473 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5476 mddev
->curr_resync
= 0;
5477 wake_up(&resync_wait
);
5478 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5479 md_wakeup_thread(mddev
->thread
);
5481 EXPORT_SYMBOL_GPL(md_do_sync
);
5484 static int remove_and_add_spares(mddev_t
*mddev
)
5487 struct list_head
*rtmp
;
5490 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5491 if (rdev
->raid_disk
>= 0 &&
5492 (test_bit(Faulty
, &rdev
->flags
) ||
5493 ! test_bit(In_sync
, &rdev
->flags
)) &&
5494 atomic_read(&rdev
->nr_pending
)==0) {
5495 if (mddev
->pers
->hot_remove_disk(
5496 mddev
, rdev
->raid_disk
)==0) {
5498 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5499 sysfs_remove_link(&mddev
->kobj
, nm
);
5500 rdev
->raid_disk
= -1;
5504 if (mddev
->degraded
) {
5505 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5506 if (rdev
->raid_disk
< 0
5507 && !test_bit(Faulty
, &rdev
->flags
)) {
5508 rdev
->recovery_offset
= 0;
5509 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
5511 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5512 if (sysfs_create_link(&mddev
->kobj
,
5515 "md: cannot register "
5519 md_new_event(mddev
);
5527 * This routine is regularly called by all per-raid-array threads to
5528 * deal with generic issues like resync and super-block update.
5529 * Raid personalities that don't have a thread (linear/raid0) do not
5530 * need this as they never do any recovery or update the superblock.
5532 * It does not do any resync itself, but rather "forks" off other threads
5533 * to do that as needed.
5534 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5535 * "->recovery" and create a thread at ->sync_thread.
5536 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5537 * and wakeups up this thread which will reap the thread and finish up.
5538 * This thread also removes any faulty devices (with nr_pending == 0).
5540 * The overall approach is:
5541 * 1/ if the superblock needs updating, update it.
5542 * 2/ If a recovery thread is running, don't do anything else.
5543 * 3/ If recovery has finished, clean up, possibly marking spares active.
5544 * 4/ If there are any faulty devices, remove them.
5545 * 5/ If array is degraded, try to add spares devices
5546 * 6/ If array has spares or is not in-sync, start a resync thread.
5548 void md_check_recovery(mddev_t
*mddev
)
5551 struct list_head
*rtmp
;
5555 bitmap_daemon_work(mddev
->bitmap
);
5560 if (signal_pending(current
)) {
5561 if (mddev
->pers
->sync_request
) {
5562 printk(KERN_INFO
"md: %s in immediate safe mode\n",
5564 mddev
->safemode
= 2;
5566 flush_signals(current
);
5571 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
5572 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
5573 (mddev
->safemode
== 1) ||
5574 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
5575 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
5579 if (mddev_trylock(mddev
)) {
5582 spin_lock_irq(&mddev
->write_lock
);
5583 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
5584 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
5586 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5588 if (mddev
->safemode
== 1)
5589 mddev
->safemode
= 0;
5590 spin_unlock_irq(&mddev
->write_lock
);
5593 md_update_sb(mddev
, 0);
5596 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
5597 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
5598 /* resync/recovery still happening */
5599 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5602 if (mddev
->sync_thread
) {
5603 /* resync has finished, collect result */
5604 md_unregister_thread(mddev
->sync_thread
);
5605 mddev
->sync_thread
= NULL
;
5606 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5607 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5609 /* activate any spares */
5610 mddev
->pers
->spare_active(mddev
);
5612 md_update_sb(mddev
, 1);
5614 /* if array is no-longer degraded, then any saved_raid_disk
5615 * information must be scrapped
5617 if (!mddev
->degraded
)
5618 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5619 rdev
->saved_raid_disk
= -1;
5621 mddev
->recovery
= 0;
5622 /* flag recovery needed just to double check */
5623 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5624 md_new_event(mddev
);
5627 /* Clear some bits that don't mean anything, but
5630 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5631 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5632 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5633 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5635 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
5637 /* no recovery is running.
5638 * remove any failed drives, then
5639 * add spares if possible.
5640 * Spare are also removed and re-added, to allow
5641 * the personality to fail the re-add.
5644 if (mddev
->reshape_position
!= MaxSector
) {
5645 if (mddev
->pers
->check_reshape(mddev
) != 0)
5646 /* Cannot proceed */
5648 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
5649 } else if ((spares
= remove_and_add_spares(mddev
))) {
5650 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5651 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
5652 } else if (mddev
->recovery_cp
< MaxSector
) {
5653 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5654 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5655 /* nothing to be done ... */
5658 if (mddev
->pers
->sync_request
) {
5659 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
5660 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
5661 /* We are adding a device or devices to an array
5662 * which has the bitmap stored on all devices.
5663 * So make sure all bitmap pages get written
5665 bitmap_write_all(mddev
->bitmap
);
5667 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5670 if (!mddev
->sync_thread
) {
5671 printk(KERN_ERR
"%s: could not start resync"
5674 /* leave the spares where they are, it shouldn't hurt */
5675 mddev
->recovery
= 0;
5677 md_wakeup_thread(mddev
->sync_thread
);
5678 md_new_event(mddev
);
5681 mddev_unlock(mddev
);
5685 static int md_notify_reboot(struct notifier_block
*this,
5686 unsigned long code
, void *x
)
5688 struct list_head
*tmp
;
5691 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5693 printk(KERN_INFO
"md: stopping all md devices.\n");
5695 ITERATE_MDDEV(mddev
,tmp
)
5696 if (mddev_trylock(mddev
)) {
5697 do_md_stop (mddev
, 1);
5698 mddev_unlock(mddev
);
5701 * certain more exotic SCSI devices are known to be
5702 * volatile wrt too early system reboots. While the
5703 * right place to handle this issue is the given
5704 * driver, we do want to have a safe RAID driver ...
5711 static struct notifier_block md_notifier
= {
5712 .notifier_call
= md_notify_reboot
,
5714 .priority
= INT_MAX
, /* before any real devices */
5717 static void md_geninit(void)
5719 struct proc_dir_entry
*p
;
5721 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5723 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
5725 p
->proc_fops
= &md_seq_fops
;
5728 static int __init
md_init(void)
5730 if (register_blkdev(MAJOR_NR
, "md"))
5732 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5733 unregister_blkdev(MAJOR_NR
, "md");
5736 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5737 md_probe
, NULL
, NULL
);
5738 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5739 md_probe
, NULL
, NULL
);
5741 register_reboot_notifier(&md_notifier
);
5742 raid_table_header
= register_sysctl_table(raid_root_table
);
5752 * Searches all registered partitions for autorun RAID arrays
5755 static dev_t detected_devices
[128];
5758 void md_autodetect_dev(dev_t dev
)
5760 if (dev_cnt
>= 0 && dev_cnt
< 127)
5761 detected_devices
[dev_cnt
++] = dev
;
5765 static void autostart_arrays(int part
)
5770 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
5772 for (i
= 0; i
< dev_cnt
; i
++) {
5773 dev_t dev
= detected_devices
[i
];
5775 rdev
= md_import_device(dev
,0, 0);
5779 if (test_bit(Faulty
, &rdev
->flags
)) {
5783 list_add(&rdev
->same_set
, &pending_raid_disks
);
5787 autorun_devices(part
);
5790 #endif /* !MODULE */
5792 static __exit
void md_exit(void)
5795 struct list_head
*tmp
;
5797 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
5798 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
5800 unregister_blkdev(MAJOR_NR
,"md");
5801 unregister_blkdev(mdp_major
, "mdp");
5802 unregister_reboot_notifier(&md_notifier
);
5803 unregister_sysctl_table(raid_table_header
);
5804 remove_proc_entry("mdstat", NULL
);
5805 ITERATE_MDDEV(mddev
,tmp
) {
5806 struct gendisk
*disk
= mddev
->gendisk
;
5809 export_array(mddev
);
5812 mddev
->gendisk
= NULL
;
5817 module_init(md_init
)
5818 module_exit(md_exit
)
5820 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5822 return sprintf(buffer
, "%d", start_readonly
);
5824 static int set_ro(const char *val
, struct kernel_param
*kp
)
5827 int num
= simple_strtoul(val
, &e
, 10);
5828 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5829 start_readonly
= num
;
5835 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
5836 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
5839 EXPORT_SYMBOL(register_md_personality
);
5840 EXPORT_SYMBOL(unregister_md_personality
);
5841 EXPORT_SYMBOL(md_error
);
5842 EXPORT_SYMBOL(md_done_sync
);
5843 EXPORT_SYMBOL(md_write_start
);
5844 EXPORT_SYMBOL(md_write_end
);
5845 EXPORT_SYMBOL(md_register_thread
);
5846 EXPORT_SYMBOL(md_unregister_thread
);
5847 EXPORT_SYMBOL(md_wakeup_thread
);
5848 EXPORT_SYMBOL(md_check_recovery
);
5849 MODULE_LICENSE("GPL");
5851 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);