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 (struct request_queue
*q
, struct bio
*bio
)
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 void super_written(struct bio
*bio
, int error
)
389 mdk_rdev_t
*rdev
= bio
->bi_private
;
390 mddev_t
*mddev
= rdev
->mddev
;
392 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
393 printk("md: super_written gets error=%d, uptodate=%d\n",
394 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
395 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
396 md_error(mddev
, rdev
);
399 if (atomic_dec_and_test(&mddev
->pending_writes
))
400 wake_up(&mddev
->sb_wait
);
404 static void super_written_barrier(struct bio
*bio
, int error
)
406 struct bio
*bio2
= bio
->bi_private
;
407 mdk_rdev_t
*rdev
= bio2
->bi_private
;
408 mddev_t
*mddev
= rdev
->mddev
;
410 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
411 error
== -EOPNOTSUPP
) {
413 /* barriers don't appear to be supported :-( */
414 set_bit(BarriersNotsupp
, &rdev
->flags
);
415 mddev
->barriers_work
= 0;
416 spin_lock_irqsave(&mddev
->write_lock
, flags
);
417 bio2
->bi_next
= mddev
->biolist
;
418 mddev
->biolist
= bio2
;
419 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
420 wake_up(&mddev
->sb_wait
);
424 bio
->bi_private
= rdev
;
425 super_written(bio
, error
);
429 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
430 sector_t sector
, int size
, struct page
*page
)
432 /* write first size bytes of page to sector of rdev
433 * Increment mddev->pending_writes before returning
434 * and decrement it on completion, waking up sb_wait
435 * if zero is reached.
436 * If an error occurred, call md_error
438 * As we might need to resubmit the request if BIO_RW_BARRIER
439 * causes ENOTSUPP, we allocate a spare bio...
441 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
442 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
444 bio
->bi_bdev
= rdev
->bdev
;
445 bio
->bi_sector
= sector
;
446 bio_add_page(bio
, page
, size
, 0);
447 bio
->bi_private
= rdev
;
448 bio
->bi_end_io
= super_written
;
451 atomic_inc(&mddev
->pending_writes
);
452 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
454 rw
|= (1<<BIO_RW_BARRIER
);
455 rbio
= bio_clone(bio
, GFP_NOIO
);
456 rbio
->bi_private
= bio
;
457 rbio
->bi_end_io
= super_written_barrier
;
458 submit_bio(rw
, rbio
);
463 void md_super_wait(mddev_t
*mddev
)
465 /* wait for all superblock writes that were scheduled to complete.
466 * if any had to be retried (due to BARRIER problems), retry them
470 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
471 if (atomic_read(&mddev
->pending_writes
)==0)
473 while (mddev
->biolist
) {
475 spin_lock_irq(&mddev
->write_lock
);
476 bio
= mddev
->biolist
;
477 mddev
->biolist
= bio
->bi_next
;
479 spin_unlock_irq(&mddev
->write_lock
);
480 submit_bio(bio
->bi_rw
, bio
);
484 finish_wait(&mddev
->sb_wait
, &wq
);
487 static void bi_complete(struct bio
*bio
, int error
)
489 complete((struct completion
*)bio
->bi_private
);
492 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
493 struct page
*page
, int rw
)
495 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
496 struct completion event
;
499 rw
|= (1 << BIO_RW_SYNC
);
502 bio
->bi_sector
= sector
;
503 bio_add_page(bio
, page
, size
, 0);
504 init_completion(&event
);
505 bio
->bi_private
= &event
;
506 bio
->bi_end_io
= bi_complete
;
508 wait_for_completion(&event
);
510 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
514 EXPORT_SYMBOL_GPL(sync_page_io
);
516 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
518 char b
[BDEVNAME_SIZE
];
519 if (!rdev
->sb_page
) {
527 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
533 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
534 bdevname(rdev
->bdev
,b
));
538 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
540 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
541 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
542 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
543 (sb1
->set_uuid3
== sb2
->set_uuid3
))
551 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
554 mdp_super_t
*tmp1
, *tmp2
;
556 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
557 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
559 if (!tmp1
|| !tmp2
) {
561 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
569 * nr_disks is not constant
574 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
586 static u32
md_csum_fold(u32 csum
)
588 csum
= (csum
& 0xffff) + (csum
>> 16);
589 return (csum
& 0xffff) + (csum
>> 16);
592 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
595 u32
*sb32
= (u32
*)sb
;
597 unsigned int disk_csum
, csum
;
599 disk_csum
= sb
->sb_csum
;
602 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
604 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
608 /* This used to use csum_partial, which was wrong for several
609 * reasons including that different results are returned on
610 * different architectures. It isn't critical that we get exactly
611 * the same return value as before (we always csum_fold before
612 * testing, and that removes any differences). However as we
613 * know that csum_partial always returned a 16bit value on
614 * alphas, do a fold to maximise conformity to previous behaviour.
616 sb
->sb_csum
= md_csum_fold(disk_csum
);
618 sb
->sb_csum
= disk_csum
;
625 * Handle superblock details.
626 * We want to be able to handle multiple superblock formats
627 * so we have a common interface to them all, and an array of
628 * different handlers.
629 * We rely on user-space to write the initial superblock, and support
630 * reading and updating of superblocks.
631 * Interface methods are:
632 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
633 * loads and validates a superblock on dev.
634 * if refdev != NULL, compare superblocks on both devices
636 * 0 - dev has a superblock that is compatible with refdev
637 * 1 - dev has a superblock that is compatible and newer than refdev
638 * so dev should be used as the refdev in future
639 * -EINVAL superblock incompatible or invalid
640 * -othererror e.g. -EIO
642 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
643 * Verify that dev is acceptable into mddev.
644 * The first time, mddev->raid_disks will be 0, and data from
645 * dev should be merged in. Subsequent calls check that dev
646 * is new enough. Return 0 or -EINVAL
648 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
649 * Update the superblock for rdev with data in mddev
650 * This does not write to disc.
656 struct module
*owner
;
657 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
658 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
659 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
663 * load_super for 0.90.0
665 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
667 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
673 * Calculate the position of the superblock,
674 * it's at the end of the disk.
676 * It also happens to be a multiple of 4Kb.
678 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
679 rdev
->sb_offset
= sb_offset
;
681 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
686 bdevname(rdev
->bdev
, b
);
687 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
689 if (sb
->md_magic
!= MD_SB_MAGIC
) {
690 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
695 if (sb
->major_version
!= 0 ||
696 sb
->minor_version
< 90 ||
697 sb
->minor_version
> 91) {
698 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
699 sb
->major_version
, sb
->minor_version
,
704 if (sb
->raid_disks
<= 0)
707 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
708 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
713 rdev
->preferred_minor
= sb
->md_minor
;
714 rdev
->data_offset
= 0;
715 rdev
->sb_size
= MD_SB_BYTES
;
717 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
718 if (sb
->level
!= 1 && sb
->level
!= 4
719 && sb
->level
!= 5 && sb
->level
!= 6
720 && sb
->level
!= 10) {
721 /* FIXME use a better test */
723 "md: bitmaps not supported for this level.\n");
728 if (sb
->level
== LEVEL_MULTIPATH
)
731 rdev
->desc_nr
= sb
->this_disk
.number
;
737 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
738 if (!uuid_equal(refsb
, sb
)) {
739 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
740 b
, bdevname(refdev
->bdev
,b2
));
743 if (!sb_equal(refsb
, sb
)) {
744 printk(KERN_WARNING
"md: %s has same UUID"
745 " but different superblock to %s\n",
746 b
, bdevname(refdev
->bdev
, b2
));
750 ev2
= md_event(refsb
);
756 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
758 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
759 /* "this cannot possibly happen" ... */
767 * validate_super for 0.90.0
769 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
772 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
773 __u64 ev1
= md_event(sb
);
775 rdev
->raid_disk
= -1;
777 if (mddev
->raid_disks
== 0) {
778 mddev
->major_version
= 0;
779 mddev
->minor_version
= sb
->minor_version
;
780 mddev
->patch_version
= sb
->patch_version
;
781 mddev
->persistent
= ! sb
->not_persistent
;
782 mddev
->chunk_size
= sb
->chunk_size
;
783 mddev
->ctime
= sb
->ctime
;
784 mddev
->utime
= sb
->utime
;
785 mddev
->level
= sb
->level
;
786 mddev
->clevel
[0] = 0;
787 mddev
->layout
= sb
->layout
;
788 mddev
->raid_disks
= sb
->raid_disks
;
789 mddev
->size
= sb
->size
;
791 mddev
->bitmap_offset
= 0;
792 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
794 if (mddev
->minor_version
>= 91) {
795 mddev
->reshape_position
= sb
->reshape_position
;
796 mddev
->delta_disks
= sb
->delta_disks
;
797 mddev
->new_level
= sb
->new_level
;
798 mddev
->new_layout
= sb
->new_layout
;
799 mddev
->new_chunk
= sb
->new_chunk
;
801 mddev
->reshape_position
= MaxSector
;
802 mddev
->delta_disks
= 0;
803 mddev
->new_level
= mddev
->level
;
804 mddev
->new_layout
= mddev
->layout
;
805 mddev
->new_chunk
= mddev
->chunk_size
;
808 if (sb
->state
& (1<<MD_SB_CLEAN
))
809 mddev
->recovery_cp
= MaxSector
;
811 if (sb
->events_hi
== sb
->cp_events_hi
&&
812 sb
->events_lo
== sb
->cp_events_lo
) {
813 mddev
->recovery_cp
= sb
->recovery_cp
;
815 mddev
->recovery_cp
= 0;
818 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
819 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
820 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
821 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
823 mddev
->max_disks
= MD_SB_DISKS
;
825 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
826 mddev
->bitmap_file
== NULL
)
827 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
829 } else if (mddev
->pers
== NULL
) {
830 /* Insist on good event counter while assembling */
832 if (ev1
< mddev
->events
)
834 } else if (mddev
->bitmap
) {
835 /* if adding to array with a bitmap, then we can accept an
836 * older device ... but not too old.
838 if (ev1
< mddev
->bitmap
->events_cleared
)
841 if (ev1
< mddev
->events
)
842 /* just a hot-add of a new device, leave raid_disk at -1 */
846 if (mddev
->level
!= LEVEL_MULTIPATH
) {
847 desc
= sb
->disks
+ rdev
->desc_nr
;
849 if (desc
->state
& (1<<MD_DISK_FAULTY
))
850 set_bit(Faulty
, &rdev
->flags
);
851 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
852 desc->raid_disk < mddev->raid_disks */) {
853 set_bit(In_sync
, &rdev
->flags
);
854 rdev
->raid_disk
= desc
->raid_disk
;
856 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
857 set_bit(WriteMostly
, &rdev
->flags
);
858 } else /* MULTIPATH are always insync */
859 set_bit(In_sync
, &rdev
->flags
);
864 * sync_super for 0.90.0
866 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
869 struct list_head
*tmp
;
871 int next_spare
= mddev
->raid_disks
;
874 /* make rdev->sb match mddev data..
877 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
878 * 3/ any empty disks < next_spare become removed
880 * disks[0] gets initialised to REMOVED because
881 * we cannot be sure from other fields if it has
882 * been initialised or not.
885 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
887 rdev
->sb_size
= MD_SB_BYTES
;
889 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
891 memset(sb
, 0, sizeof(*sb
));
893 sb
->md_magic
= MD_SB_MAGIC
;
894 sb
->major_version
= mddev
->major_version
;
895 sb
->patch_version
= mddev
->patch_version
;
896 sb
->gvalid_words
= 0; /* ignored */
897 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
898 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
899 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
900 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
902 sb
->ctime
= mddev
->ctime
;
903 sb
->level
= mddev
->level
;
904 sb
->size
= mddev
->size
;
905 sb
->raid_disks
= mddev
->raid_disks
;
906 sb
->md_minor
= mddev
->md_minor
;
907 sb
->not_persistent
= !mddev
->persistent
;
908 sb
->utime
= mddev
->utime
;
910 sb
->events_hi
= (mddev
->events
>>32);
911 sb
->events_lo
= (u32
)mddev
->events
;
913 if (mddev
->reshape_position
== MaxSector
)
914 sb
->minor_version
= 90;
916 sb
->minor_version
= 91;
917 sb
->reshape_position
= mddev
->reshape_position
;
918 sb
->new_level
= mddev
->new_level
;
919 sb
->delta_disks
= mddev
->delta_disks
;
920 sb
->new_layout
= mddev
->new_layout
;
921 sb
->new_chunk
= mddev
->new_chunk
;
923 mddev
->minor_version
= sb
->minor_version
;
926 sb
->recovery_cp
= mddev
->recovery_cp
;
927 sb
->cp_events_hi
= (mddev
->events
>>32);
928 sb
->cp_events_lo
= (u32
)mddev
->events
;
929 if (mddev
->recovery_cp
== MaxSector
)
930 sb
->state
= (1<< MD_SB_CLEAN
);
934 sb
->layout
= mddev
->layout
;
935 sb
->chunk_size
= mddev
->chunk_size
;
937 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
938 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
940 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
941 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
944 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
945 && !test_bit(Faulty
, &rdev2
->flags
))
946 desc_nr
= rdev2
->raid_disk
;
948 desc_nr
= next_spare
++;
949 rdev2
->desc_nr
= desc_nr
;
950 d
= &sb
->disks
[rdev2
->desc_nr
];
952 d
->number
= rdev2
->desc_nr
;
953 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
954 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
955 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
956 && !test_bit(Faulty
, &rdev2
->flags
))
957 d
->raid_disk
= rdev2
->raid_disk
;
959 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
960 if (test_bit(Faulty
, &rdev2
->flags
))
961 d
->state
= (1<<MD_DISK_FAULTY
);
962 else if (test_bit(In_sync
, &rdev2
->flags
)) {
963 d
->state
= (1<<MD_DISK_ACTIVE
);
964 d
->state
|= (1<<MD_DISK_SYNC
);
972 if (test_bit(WriteMostly
, &rdev2
->flags
))
973 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
975 /* now set the "removed" and "faulty" bits on any missing devices */
976 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
977 mdp_disk_t
*d
= &sb
->disks
[i
];
978 if (d
->state
== 0 && d
->number
== 0) {
981 d
->state
= (1<<MD_DISK_REMOVED
);
982 d
->state
|= (1<<MD_DISK_FAULTY
);
986 sb
->nr_disks
= nr_disks
;
987 sb
->active_disks
= active
;
988 sb
->working_disks
= working
;
989 sb
->failed_disks
= failed
;
990 sb
->spare_disks
= spare
;
992 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
993 sb
->sb_csum
= calc_sb_csum(sb
);
997 * version 1 superblock
1000 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1004 unsigned long long newcsum
;
1005 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1006 __le32
*isuper
= (__le32
*)sb
;
1009 disk_csum
= sb
->sb_csum
;
1012 for (i
=0; size
>=4; size
-= 4 )
1013 newcsum
+= le32_to_cpu(*isuper
++);
1016 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1018 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1019 sb
->sb_csum
= disk_csum
;
1020 return cpu_to_le32(csum
);
1023 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1025 struct mdp_superblock_1
*sb
;
1028 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1032 * Calculate the position of the superblock.
1033 * It is always aligned to a 4K boundary and
1034 * depeding on minor_version, it can be:
1035 * 0: At least 8K, but less than 12K, from end of device
1036 * 1: At start of device
1037 * 2: 4K from start of device.
1039 switch(minor_version
) {
1041 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1043 sb_offset
&= ~(sector_t
)(4*2-1);
1044 /* convert from sectors to K */
1056 rdev
->sb_offset
= sb_offset
;
1058 /* superblock is rarely larger than 1K, but it can be larger,
1059 * and it is safe to read 4k, so we do that
1061 ret
= read_disk_sb(rdev
, 4096);
1062 if (ret
) return ret
;
1065 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1067 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1068 sb
->major_version
!= cpu_to_le32(1) ||
1069 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1070 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1071 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1074 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1075 printk("md: invalid superblock checksum on %s\n",
1076 bdevname(rdev
->bdev
,b
));
1079 if (le64_to_cpu(sb
->data_size
) < 10) {
1080 printk("md: data_size too small on %s\n",
1081 bdevname(rdev
->bdev
,b
));
1084 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1085 if (sb
->level
!= cpu_to_le32(1) &&
1086 sb
->level
!= cpu_to_le32(4) &&
1087 sb
->level
!= cpu_to_le32(5) &&
1088 sb
->level
!= cpu_to_le32(6) &&
1089 sb
->level
!= cpu_to_le32(10)) {
1091 "md: bitmaps not supported for this level.\n");
1096 rdev
->preferred_minor
= 0xffff;
1097 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1098 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1100 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1101 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1102 if (rdev
->sb_size
& bmask
)
1103 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1105 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1108 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1114 struct mdp_superblock_1
*refsb
=
1115 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1117 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1118 sb
->level
!= refsb
->level
||
1119 sb
->layout
!= refsb
->layout
||
1120 sb
->chunksize
!= refsb
->chunksize
) {
1121 printk(KERN_WARNING
"md: %s has strangely different"
1122 " superblock to %s\n",
1123 bdevname(rdev
->bdev
,b
),
1124 bdevname(refdev
->bdev
,b2
));
1127 ev1
= le64_to_cpu(sb
->events
);
1128 ev2
= le64_to_cpu(refsb
->events
);
1136 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1138 rdev
->size
= rdev
->sb_offset
;
1139 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1141 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1142 if (le32_to_cpu(sb
->chunksize
))
1143 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1145 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1150 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1152 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1153 __u64 ev1
= le64_to_cpu(sb
->events
);
1155 rdev
->raid_disk
= -1;
1157 if (mddev
->raid_disks
== 0) {
1158 mddev
->major_version
= 1;
1159 mddev
->patch_version
= 0;
1160 mddev
->persistent
= 1;
1161 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1162 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1163 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1164 mddev
->level
= le32_to_cpu(sb
->level
);
1165 mddev
->clevel
[0] = 0;
1166 mddev
->layout
= le32_to_cpu(sb
->layout
);
1167 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1168 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1169 mddev
->events
= ev1
;
1170 mddev
->bitmap_offset
= 0;
1171 mddev
->default_bitmap_offset
= 1024 >> 9;
1173 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1174 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1176 mddev
->max_disks
= (4096-256)/2;
1178 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1179 mddev
->bitmap_file
== NULL
)
1180 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1182 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1183 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1184 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1185 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1186 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1187 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1189 mddev
->reshape_position
= MaxSector
;
1190 mddev
->delta_disks
= 0;
1191 mddev
->new_level
= mddev
->level
;
1192 mddev
->new_layout
= mddev
->layout
;
1193 mddev
->new_chunk
= mddev
->chunk_size
;
1196 } else if (mddev
->pers
== NULL
) {
1197 /* Insist of good event counter while assembling */
1199 if (ev1
< mddev
->events
)
1201 } else if (mddev
->bitmap
) {
1202 /* If adding to array with a bitmap, then we can accept an
1203 * older device, but not too old.
1205 if (ev1
< mddev
->bitmap
->events_cleared
)
1208 if (ev1
< mddev
->events
)
1209 /* just a hot-add of a new device, leave raid_disk at -1 */
1212 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1214 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1216 case 0xffff: /* spare */
1218 case 0xfffe: /* faulty */
1219 set_bit(Faulty
, &rdev
->flags
);
1222 if ((le32_to_cpu(sb
->feature_map
) &
1223 MD_FEATURE_RECOVERY_OFFSET
))
1224 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1226 set_bit(In_sync
, &rdev
->flags
);
1227 rdev
->raid_disk
= role
;
1230 if (sb
->devflags
& WriteMostly1
)
1231 set_bit(WriteMostly
, &rdev
->flags
);
1232 } else /* MULTIPATH are always insync */
1233 set_bit(In_sync
, &rdev
->flags
);
1238 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1240 struct mdp_superblock_1
*sb
;
1241 struct list_head
*tmp
;
1244 /* make rdev->sb match mddev and rdev data. */
1246 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1248 sb
->feature_map
= 0;
1250 sb
->recovery_offset
= cpu_to_le64(0);
1251 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1252 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1253 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1255 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1256 sb
->events
= cpu_to_le64(mddev
->events
);
1258 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1260 sb
->resync_offset
= cpu_to_le64(0);
1262 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1264 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1265 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1267 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1268 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1269 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1272 if (rdev
->raid_disk
>= 0 &&
1273 !test_bit(In_sync
, &rdev
->flags
) &&
1274 rdev
->recovery_offset
> 0) {
1275 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1276 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1279 if (mddev
->reshape_position
!= MaxSector
) {
1280 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1281 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1282 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1283 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1284 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1285 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1289 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1290 if (rdev2
->desc_nr
+1 > max_dev
)
1291 max_dev
= rdev2
->desc_nr
+1;
1293 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1294 sb
->max_dev
= cpu_to_le32(max_dev
);
1295 for (i
=0; i
<max_dev
;i
++)
1296 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1298 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1300 if (test_bit(Faulty
, &rdev2
->flags
))
1301 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1302 else if (test_bit(In_sync
, &rdev2
->flags
))
1303 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1304 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1305 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1307 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1310 sb
->sb_csum
= calc_sb_1_csum(sb
);
1314 static struct super_type super_types
[] = {
1317 .owner
= THIS_MODULE
,
1318 .load_super
= super_90_load
,
1319 .validate_super
= super_90_validate
,
1320 .sync_super
= super_90_sync
,
1324 .owner
= THIS_MODULE
,
1325 .load_super
= super_1_load
,
1326 .validate_super
= super_1_validate
,
1327 .sync_super
= super_1_sync
,
1331 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1333 struct list_head
*tmp
, *tmp2
;
1334 mdk_rdev_t
*rdev
, *rdev2
;
1336 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1337 ITERATE_RDEV(mddev2
, rdev2
, tmp2
)
1338 if (rdev
->bdev
->bd_contains
==
1339 rdev2
->bdev
->bd_contains
)
1345 static LIST_HEAD(pending_raid_disks
);
1347 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1349 char b
[BDEVNAME_SIZE
];
1358 /* make sure rdev->size exceeds mddev->size */
1359 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1361 /* Cannot change size, so fail
1362 * If mddev->level <= 0, then we don't care
1363 * about aligning sizes (e.g. linear)
1365 if (mddev
->level
> 0)
1368 mddev
->size
= rdev
->size
;
1371 /* Verify rdev->desc_nr is unique.
1372 * If it is -1, assign a free number, else
1373 * check number is not in use
1375 if (rdev
->desc_nr
< 0) {
1377 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1378 while (find_rdev_nr(mddev
, choice
))
1380 rdev
->desc_nr
= choice
;
1382 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1385 bdevname(rdev
->bdev
,b
);
1386 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1388 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1391 rdev
->mddev
= mddev
;
1392 printk(KERN_INFO
"md: bind<%s>\n", b
);
1394 rdev
->kobj
.parent
= &mddev
->kobj
;
1395 if ((err
= kobject_add(&rdev
->kobj
)))
1398 if (rdev
->bdev
->bd_part
)
1399 ko
= &rdev
->bdev
->bd_part
->kobj
;
1401 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1402 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1403 kobject_del(&rdev
->kobj
);
1406 list_add(&rdev
->same_set
, &mddev
->disks
);
1407 bd_claim_by_disk(rdev
->bdev
, rdev
, mddev
->gendisk
);
1411 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1416 static void delayed_delete(struct work_struct
*ws
)
1418 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1419 kobject_del(&rdev
->kobj
);
1422 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1424 char b
[BDEVNAME_SIZE
];
1429 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1430 list_del_init(&rdev
->same_set
);
1431 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1433 sysfs_remove_link(&rdev
->kobj
, "block");
1435 /* We need to delay this, otherwise we can deadlock when
1436 * writing to 'remove' to "dev/state"
1438 INIT_WORK(&rdev
->del_work
, delayed_delete
);
1439 schedule_work(&rdev
->del_work
);
1443 * prevent the device from being mounted, repartitioned or
1444 * otherwise reused by a RAID array (or any other kernel
1445 * subsystem), by bd_claiming the device.
1447 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1450 struct block_device
*bdev
;
1451 char b
[BDEVNAME_SIZE
];
1453 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1455 printk(KERN_ERR
"md: could not open %s.\n",
1456 __bdevname(dev
, b
));
1457 return PTR_ERR(bdev
);
1459 err
= bd_claim(bdev
, rdev
);
1461 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1470 static void unlock_rdev(mdk_rdev_t
*rdev
)
1472 struct block_device
*bdev
= rdev
->bdev
;
1480 void md_autodetect_dev(dev_t dev
);
1482 static void export_rdev(mdk_rdev_t
* rdev
)
1484 char b
[BDEVNAME_SIZE
];
1485 printk(KERN_INFO
"md: export_rdev(%s)\n",
1486 bdevname(rdev
->bdev
,b
));
1490 list_del_init(&rdev
->same_set
);
1492 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1495 kobject_put(&rdev
->kobj
);
1498 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1500 unbind_rdev_from_array(rdev
);
1504 static void export_array(mddev_t
*mddev
)
1506 struct list_head
*tmp
;
1509 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1514 kick_rdev_from_array(rdev
);
1516 if (!list_empty(&mddev
->disks
))
1518 mddev
->raid_disks
= 0;
1519 mddev
->major_version
= 0;
1522 static void print_desc(mdp_disk_t
*desc
)
1524 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1525 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1528 static void print_sb(mdp_super_t
*sb
)
1533 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1534 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1535 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1537 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1538 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1539 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1540 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1541 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1542 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1543 sb
->failed_disks
, sb
->spare_disks
,
1544 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1547 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1550 desc
= sb
->disks
+ i
;
1551 if (desc
->number
|| desc
->major
|| desc
->minor
||
1552 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1553 printk(" D %2d: ", i
);
1557 printk(KERN_INFO
"md: THIS: ");
1558 print_desc(&sb
->this_disk
);
1562 static void print_rdev(mdk_rdev_t
*rdev
)
1564 char b
[BDEVNAME_SIZE
];
1565 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1566 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1567 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1569 if (rdev
->sb_loaded
) {
1570 printk(KERN_INFO
"md: rdev superblock:\n");
1571 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1573 printk(KERN_INFO
"md: no rdev superblock!\n");
1576 static void md_print_devices(void)
1578 struct list_head
*tmp
, *tmp2
;
1581 char b
[BDEVNAME_SIZE
];
1584 printk("md: **********************************\n");
1585 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1586 printk("md: **********************************\n");
1587 ITERATE_MDDEV(mddev
,tmp
) {
1590 bitmap_print_sb(mddev
->bitmap
);
1592 printk("%s: ", mdname(mddev
));
1593 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1594 printk("<%s>", bdevname(rdev
->bdev
,b
));
1597 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1600 printk("md: **********************************\n");
1605 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1607 /* Update each superblock (in-memory image), but
1608 * if we are allowed to, skip spares which already
1609 * have the right event counter, or have one earlier
1610 * (which would mean they aren't being marked as dirty
1611 * with the rest of the array)
1614 struct list_head
*tmp
;
1616 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1617 if (rdev
->sb_events
== mddev
->events
||
1619 rdev
->raid_disk
< 0 &&
1620 (rdev
->sb_events
&1)==0 &&
1621 rdev
->sb_events
+1 == mddev
->events
)) {
1622 /* Don't update this superblock */
1623 rdev
->sb_loaded
= 2;
1625 super_types
[mddev
->major_version
].
1626 sync_super(mddev
, rdev
);
1627 rdev
->sb_loaded
= 1;
1632 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1634 struct list_head
*tmp
;
1640 spin_lock_irq(&mddev
->write_lock
);
1642 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1643 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1645 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1646 /* just a clean<-> dirty transition, possibly leave spares alone,
1647 * though if events isn't the right even/odd, we will have to do
1653 if (mddev
->degraded
)
1654 /* If the array is degraded, then skipping spares is both
1655 * dangerous and fairly pointless.
1656 * Dangerous because a device that was removed from the array
1657 * might have a event_count that still looks up-to-date,
1658 * so it can be re-added without a resync.
1659 * Pointless because if there are any spares to skip,
1660 * then a recovery will happen and soon that array won't
1661 * be degraded any more and the spare can go back to sleep then.
1665 sync_req
= mddev
->in_sync
;
1666 mddev
->utime
= get_seconds();
1668 /* If this is just a dirty<->clean transition, and the array is clean
1669 * and 'events' is odd, we can roll back to the previous clean state */
1671 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1672 && (mddev
->events
& 1)
1673 && mddev
->events
!= 1)
1676 /* otherwise we have to go forward and ... */
1678 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1679 /* .. if the array isn't clean, insist on an odd 'events' */
1680 if ((mddev
->events
&1)==0) {
1685 /* otherwise insist on an even 'events' (for clean states) */
1686 if ((mddev
->events
&1)) {
1693 if (!mddev
->events
) {
1695 * oops, this 64-bit counter should never wrap.
1696 * Either we are in around ~1 trillion A.C., assuming
1697 * 1 reboot per second, or we have a bug:
1702 sync_sbs(mddev
, nospares
);
1705 * do not write anything to disk if using
1706 * nonpersistent superblocks
1708 if (!mddev
->persistent
) {
1709 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1710 spin_unlock_irq(&mddev
->write_lock
);
1711 wake_up(&mddev
->sb_wait
);
1714 spin_unlock_irq(&mddev
->write_lock
);
1717 "md: updating %s RAID superblock on device (in sync %d)\n",
1718 mdname(mddev
),mddev
->in_sync
);
1720 bitmap_update_sb(mddev
->bitmap
);
1721 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1722 char b
[BDEVNAME_SIZE
];
1723 dprintk(KERN_INFO
"md: ");
1724 if (rdev
->sb_loaded
!= 1)
1725 continue; /* no noise on spare devices */
1726 if (test_bit(Faulty
, &rdev
->flags
))
1727 dprintk("(skipping faulty ");
1729 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1730 if (!test_bit(Faulty
, &rdev
->flags
)) {
1731 md_super_write(mddev
,rdev
,
1732 rdev
->sb_offset
<<1, rdev
->sb_size
,
1734 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1735 bdevname(rdev
->bdev
,b
),
1736 (unsigned long long)rdev
->sb_offset
);
1737 rdev
->sb_events
= mddev
->events
;
1741 if (mddev
->level
== LEVEL_MULTIPATH
)
1742 /* only need to write one superblock... */
1745 md_super_wait(mddev
);
1746 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1748 spin_lock_irq(&mddev
->write_lock
);
1749 if (mddev
->in_sync
!= sync_req
||
1750 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1751 /* have to write it out again */
1752 spin_unlock_irq(&mddev
->write_lock
);
1755 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1756 spin_unlock_irq(&mddev
->write_lock
);
1757 wake_up(&mddev
->sb_wait
);
1761 /* words written to sysfs files may, or my not, be \n terminated.
1762 * We want to accept with case. For this we use cmd_match.
1764 static int cmd_match(const char *cmd
, const char *str
)
1766 /* See if cmd, written into a sysfs file, matches
1767 * str. They must either be the same, or cmd can
1768 * have a trailing newline
1770 while (*cmd
&& *str
&& *cmd
== *str
) {
1781 struct rdev_sysfs_entry
{
1782 struct attribute attr
;
1783 ssize_t (*show
)(mdk_rdev_t
*, char *);
1784 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1788 state_show(mdk_rdev_t
*rdev
, char *page
)
1793 if (test_bit(Faulty
, &rdev
->flags
)) {
1794 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1797 if (test_bit(In_sync
, &rdev
->flags
)) {
1798 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1801 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1802 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1805 if (!test_bit(Faulty
, &rdev
->flags
) &&
1806 !test_bit(In_sync
, &rdev
->flags
)) {
1807 len
+= sprintf(page
+len
, "%sspare", sep
);
1810 return len
+sprintf(page
+len
, "\n");
1814 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1817 * faulty - simulates and error
1818 * remove - disconnects the device
1819 * writemostly - sets write_mostly
1820 * -writemostly - clears write_mostly
1823 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1824 md_error(rdev
->mddev
, rdev
);
1826 } else if (cmd_match(buf
, "remove")) {
1827 if (rdev
->raid_disk
>= 0)
1830 mddev_t
*mddev
= rdev
->mddev
;
1831 kick_rdev_from_array(rdev
);
1833 md_update_sb(mddev
, 1);
1834 md_new_event(mddev
);
1837 } else if (cmd_match(buf
, "writemostly")) {
1838 set_bit(WriteMostly
, &rdev
->flags
);
1840 } else if (cmd_match(buf
, "-writemostly")) {
1841 clear_bit(WriteMostly
, &rdev
->flags
);
1844 return err
? err
: len
;
1846 static struct rdev_sysfs_entry rdev_state
=
1847 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1850 super_show(mdk_rdev_t
*rdev
, char *page
)
1852 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1853 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1854 return rdev
->sb_size
;
1858 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1861 errors_show(mdk_rdev_t
*rdev
, char *page
)
1863 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1867 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1870 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1871 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1872 atomic_set(&rdev
->corrected_errors
, n
);
1877 static struct rdev_sysfs_entry rdev_errors
=
1878 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1881 slot_show(mdk_rdev_t
*rdev
, char *page
)
1883 if (rdev
->raid_disk
< 0)
1884 return sprintf(page
, "none\n");
1886 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1890 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1893 int slot
= simple_strtoul(buf
, &e
, 10);
1894 if (strncmp(buf
, "none", 4)==0)
1896 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1898 if (rdev
->mddev
->pers
)
1899 /* Cannot set slot in active array (yet) */
1901 if (slot
>= rdev
->mddev
->raid_disks
)
1903 rdev
->raid_disk
= slot
;
1904 /* assume it is working */
1906 set_bit(In_sync
, &rdev
->flags
);
1911 static struct rdev_sysfs_entry rdev_slot
=
1912 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
1915 offset_show(mdk_rdev_t
*rdev
, char *page
)
1917 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1921 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1924 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1925 if (e
==buf
|| (*e
&& *e
!= '\n'))
1927 if (rdev
->mddev
->pers
)
1929 rdev
->data_offset
= offset
;
1933 static struct rdev_sysfs_entry rdev_offset
=
1934 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
1937 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1939 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1943 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1946 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1947 if (e
==buf
|| (*e
&& *e
!= '\n'))
1949 if (rdev
->mddev
->pers
)
1952 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1953 rdev
->mddev
->size
= size
;
1957 static struct rdev_sysfs_entry rdev_size
=
1958 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
1960 static struct attribute
*rdev_default_attrs
[] = {
1970 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1972 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1973 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1977 return entry
->show(rdev
, page
);
1981 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1982 const char *page
, size_t length
)
1984 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1985 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1989 if (!capable(CAP_SYS_ADMIN
))
1991 return entry
->store(rdev
, page
, length
);
1994 static void rdev_free(struct kobject
*ko
)
1996 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1999 static struct sysfs_ops rdev_sysfs_ops
= {
2000 .show
= rdev_attr_show
,
2001 .store
= rdev_attr_store
,
2003 static struct kobj_type rdev_ktype
= {
2004 .release
= rdev_free
,
2005 .sysfs_ops
= &rdev_sysfs_ops
,
2006 .default_attrs
= rdev_default_attrs
,
2010 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2012 * mark the device faulty if:
2014 * - the device is nonexistent (zero size)
2015 * - the device has no valid superblock
2017 * a faulty rdev _never_ has rdev->sb set.
2019 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2021 char b
[BDEVNAME_SIZE
];
2026 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2028 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2029 return ERR_PTR(-ENOMEM
);
2032 if ((err
= alloc_disk_sb(rdev
)))
2035 err
= lock_rdev(rdev
, newdev
);
2039 rdev
->kobj
.parent
= NULL
;
2040 rdev
->kobj
.ktype
= &rdev_ktype
;
2041 kobject_init(&rdev
->kobj
);
2044 rdev
->saved_raid_disk
= -1;
2045 rdev
->raid_disk
= -1;
2047 rdev
->data_offset
= 0;
2048 rdev
->sb_events
= 0;
2049 atomic_set(&rdev
->nr_pending
, 0);
2050 atomic_set(&rdev
->read_errors
, 0);
2051 atomic_set(&rdev
->corrected_errors
, 0);
2053 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2056 "md: %s has zero or unknown size, marking faulty!\n",
2057 bdevname(rdev
->bdev
,b
));
2062 if (super_format
>= 0) {
2063 err
= super_types
[super_format
].
2064 load_super(rdev
, NULL
, super_minor
);
2065 if (err
== -EINVAL
) {
2067 "md: %s does not have a valid v%d.%d "
2068 "superblock, not importing!\n",
2069 bdevname(rdev
->bdev
,b
),
2070 super_format
, super_minor
);
2075 "md: could not read %s's sb, not importing!\n",
2076 bdevname(rdev
->bdev
,b
));
2080 INIT_LIST_HEAD(&rdev
->same_set
);
2085 if (rdev
->sb_page
) {
2091 return ERR_PTR(err
);
2095 * Check a full RAID array for plausibility
2099 static void analyze_sbs(mddev_t
* mddev
)
2102 struct list_head
*tmp
;
2103 mdk_rdev_t
*rdev
, *freshest
;
2104 char b
[BDEVNAME_SIZE
];
2107 ITERATE_RDEV(mddev
,rdev
,tmp
)
2108 switch (super_types
[mddev
->major_version
].
2109 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2117 "md: fatal superblock inconsistency in %s"
2118 " -- removing from array\n",
2119 bdevname(rdev
->bdev
,b
));
2120 kick_rdev_from_array(rdev
);
2124 super_types
[mddev
->major_version
].
2125 validate_super(mddev
, freshest
);
2128 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2129 if (rdev
!= freshest
)
2130 if (super_types
[mddev
->major_version
].
2131 validate_super(mddev
, rdev
)) {
2132 printk(KERN_WARNING
"md: kicking non-fresh %s"
2134 bdevname(rdev
->bdev
,b
));
2135 kick_rdev_from_array(rdev
);
2138 if (mddev
->level
== LEVEL_MULTIPATH
) {
2139 rdev
->desc_nr
= i
++;
2140 rdev
->raid_disk
= rdev
->desc_nr
;
2141 set_bit(In_sync
, &rdev
->flags
);
2142 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2143 rdev
->raid_disk
= -1;
2144 clear_bit(In_sync
, &rdev
->flags
);
2150 if (mddev
->recovery_cp
!= MaxSector
&&
2152 printk(KERN_ERR
"md: %s: raid array is not clean"
2153 " -- starting background reconstruction\n",
2159 safe_delay_show(mddev_t
*mddev
, char *page
)
2161 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2162 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2165 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2173 /* remove a period, and count digits after it */
2174 if (len
>= sizeof(buf
))
2176 strlcpy(buf
, cbuf
, len
);
2178 for (i
=0; i
<len
; i
++) {
2180 if (isdigit(buf
[i
])) {
2185 } else if (buf
[i
] == '.') {
2190 msec
= simple_strtoul(buf
, &e
, 10);
2191 if (e
== buf
|| (*e
&& *e
!= '\n'))
2193 msec
= (msec
* 1000) / scale
;
2195 mddev
->safemode_delay
= 0;
2197 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2198 if (mddev
->safemode_delay
== 0)
2199 mddev
->safemode_delay
= 1;
2203 static struct md_sysfs_entry md_safe_delay
=
2204 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2207 level_show(mddev_t
*mddev
, char *page
)
2209 struct mdk_personality
*p
= mddev
->pers
;
2211 return sprintf(page
, "%s\n", p
->name
);
2212 else if (mddev
->clevel
[0])
2213 return sprintf(page
, "%s\n", mddev
->clevel
);
2214 else if (mddev
->level
!= LEVEL_NONE
)
2215 return sprintf(page
, "%d\n", mddev
->level
);
2221 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2228 if (len
>= sizeof(mddev
->clevel
))
2230 strncpy(mddev
->clevel
, buf
, len
);
2231 if (mddev
->clevel
[len
-1] == '\n')
2233 mddev
->clevel
[len
] = 0;
2234 mddev
->level
= LEVEL_NONE
;
2238 static struct md_sysfs_entry md_level
=
2239 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2243 layout_show(mddev_t
*mddev
, char *page
)
2245 /* just a number, not meaningful for all levels */
2246 if (mddev
->reshape_position
!= MaxSector
&&
2247 mddev
->layout
!= mddev
->new_layout
)
2248 return sprintf(page
, "%d (%d)\n",
2249 mddev
->new_layout
, mddev
->layout
);
2250 return sprintf(page
, "%d\n", mddev
->layout
);
2254 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2257 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2259 if (!*buf
|| (*e
&& *e
!= '\n'))
2264 if (mddev
->reshape_position
!= MaxSector
)
2265 mddev
->new_layout
= n
;
2270 static struct md_sysfs_entry md_layout
=
2271 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2275 raid_disks_show(mddev_t
*mddev
, char *page
)
2277 if (mddev
->raid_disks
== 0)
2279 if (mddev
->reshape_position
!= MaxSector
&&
2280 mddev
->delta_disks
!= 0)
2281 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2282 mddev
->raid_disks
- mddev
->delta_disks
);
2283 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2286 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2289 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2293 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2295 if (!*buf
|| (*e
&& *e
!= '\n'))
2299 rv
= update_raid_disks(mddev
, n
);
2300 else if (mddev
->reshape_position
!= MaxSector
) {
2301 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2302 mddev
->delta_disks
= n
- olddisks
;
2303 mddev
->raid_disks
= n
;
2305 mddev
->raid_disks
= n
;
2306 return rv
? rv
: len
;
2308 static struct md_sysfs_entry md_raid_disks
=
2309 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2312 chunk_size_show(mddev_t
*mddev
, char *page
)
2314 if (mddev
->reshape_position
!= MaxSector
&&
2315 mddev
->chunk_size
!= mddev
->new_chunk
)
2316 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2318 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2322 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2324 /* can only set chunk_size if array is not yet active */
2326 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2328 if (!*buf
|| (*e
&& *e
!= '\n'))
2333 else if (mddev
->reshape_position
!= MaxSector
)
2334 mddev
->new_chunk
= n
;
2336 mddev
->chunk_size
= n
;
2339 static struct md_sysfs_entry md_chunk_size
=
2340 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2343 resync_start_show(mddev_t
*mddev
, char *page
)
2345 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2349 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2351 /* can only set chunk_size if array is not yet active */
2353 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2357 if (!*buf
|| (*e
&& *e
!= '\n'))
2360 mddev
->recovery_cp
= n
;
2363 static struct md_sysfs_entry md_resync_start
=
2364 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2367 * The array state can be:
2370 * No devices, no size, no level
2371 * Equivalent to STOP_ARRAY ioctl
2373 * May have some settings, but array is not active
2374 * all IO results in error
2375 * When written, doesn't tear down array, but just stops it
2376 * suspended (not supported yet)
2377 * All IO requests will block. The array can be reconfigured.
2378 * Writing this, if accepted, will block until array is quiessent
2380 * no resync can happen. no superblocks get written.
2381 * write requests fail
2383 * like readonly, but behaves like 'clean' on a write request.
2385 * clean - no pending writes, but otherwise active.
2386 * When written to inactive array, starts without resync
2387 * If a write request arrives then
2388 * if metadata is known, mark 'dirty' and switch to 'active'.
2389 * if not known, block and switch to write-pending
2390 * If written to an active array that has pending writes, then fails.
2392 * fully active: IO and resync can be happening.
2393 * When written to inactive array, starts with resync
2396 * clean, but writes are blocked waiting for 'active' to be written.
2399 * like active, but no writes have been seen for a while (100msec).
2402 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2403 write_pending
, active_idle
, bad_word
};
2404 static char *array_states
[] = {
2405 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2406 "write-pending", "active-idle", NULL
};
2408 static int match_word(const char *word
, char **list
)
2411 for (n
=0; list
[n
]; n
++)
2412 if (cmd_match(word
, list
[n
]))
2418 array_state_show(mddev_t
*mddev
, char *page
)
2420 enum array_state st
= inactive
;
2433 else if (mddev
->safemode
)
2439 if (list_empty(&mddev
->disks
) &&
2440 mddev
->raid_disks
== 0 &&
2446 return sprintf(page
, "%s\n", array_states
[st
]);
2449 static int do_md_stop(mddev_t
* mddev
, int ro
);
2450 static int do_md_run(mddev_t
* mddev
);
2451 static int restart_array(mddev_t
*mddev
);
2454 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2457 enum array_state st
= match_word(buf
, array_states
);
2462 /* stopping an active array */
2464 if (atomic_read(&mddev
->active
) > 1)
2466 err
= do_md_stop(mddev
, 0);
2470 /* stopping an active array */
2472 if (atomic_read(&mddev
->active
) > 1)
2474 err
= do_md_stop(mddev
, 2);
2478 break; /* not supported yet */
2481 err
= do_md_stop(mddev
, 1);
2484 err
= do_md_run(mddev
);
2488 /* stopping an active array */
2490 err
= do_md_stop(mddev
, 1);
2492 mddev
->ro
= 2; /* FIXME mark devices writable */
2495 err
= do_md_run(mddev
);
2500 restart_array(mddev
);
2501 spin_lock_irq(&mddev
->write_lock
);
2502 if (atomic_read(&mddev
->writes_pending
) == 0) {
2504 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2506 spin_unlock_irq(&mddev
->write_lock
);
2509 mddev
->recovery_cp
= MaxSector
;
2510 err
= do_md_run(mddev
);
2515 restart_array(mddev
);
2516 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2517 wake_up(&mddev
->sb_wait
);
2521 err
= do_md_run(mddev
);
2526 /* these cannot be set */
2534 static struct md_sysfs_entry md_array_state
=
2535 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2538 null_show(mddev_t
*mddev
, char *page
)
2544 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2546 /* buf must be %d:%d\n? giving major and minor numbers */
2547 /* The new device is added to the array.
2548 * If the array has a persistent superblock, we read the
2549 * superblock to initialise info and check validity.
2550 * Otherwise, only checking done is that in bind_rdev_to_array,
2551 * which mainly checks size.
2554 int major
= simple_strtoul(buf
, &e
, 10);
2560 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2562 minor
= simple_strtoul(e
+1, &e
, 10);
2563 if (*e
&& *e
!= '\n')
2565 dev
= MKDEV(major
, minor
);
2566 if (major
!= MAJOR(dev
) ||
2567 minor
!= MINOR(dev
))
2571 if (mddev
->persistent
) {
2572 rdev
= md_import_device(dev
, mddev
->major_version
,
2573 mddev
->minor_version
);
2574 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2575 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2576 mdk_rdev_t
, same_set
);
2577 err
= super_types
[mddev
->major_version
]
2578 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2583 rdev
= md_import_device(dev
, -1, -1);
2586 return PTR_ERR(rdev
);
2587 err
= bind_rdev_to_array(rdev
, mddev
);
2591 return err
? err
: len
;
2594 static struct md_sysfs_entry md_new_device
=
2595 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2598 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2601 unsigned long chunk
, end_chunk
;
2605 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2607 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2608 if (buf
== end
) break;
2609 if (*end
== '-') { /* range */
2611 end_chunk
= simple_strtoul(buf
, &end
, 0);
2612 if (buf
== end
) break;
2614 if (*end
&& !isspace(*end
)) break;
2615 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2617 while (isspace(*buf
)) buf
++;
2619 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2624 static struct md_sysfs_entry md_bitmap
=
2625 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2628 size_show(mddev_t
*mddev
, char *page
)
2630 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2633 static int update_size(mddev_t
*mddev
, unsigned long size
);
2636 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2638 /* If array is inactive, we can reduce the component size, but
2639 * not increase it (except from 0).
2640 * If array is active, we can try an on-line resize
2644 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2645 if (!*buf
|| *buf
== '\n' ||
2650 err
= update_size(mddev
, size
);
2651 md_update_sb(mddev
, 1);
2653 if (mddev
->size
== 0 ||
2659 return err
? err
: len
;
2662 static struct md_sysfs_entry md_size
=
2663 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2667 * This is either 'none' for arrays with externally managed metadata,
2668 * or N.M for internally known formats
2671 metadata_show(mddev_t
*mddev
, char *page
)
2673 if (mddev
->persistent
)
2674 return sprintf(page
, "%d.%d\n",
2675 mddev
->major_version
, mddev
->minor_version
);
2677 return sprintf(page
, "none\n");
2681 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2685 if (!list_empty(&mddev
->disks
))
2688 if (cmd_match(buf
, "none")) {
2689 mddev
->persistent
= 0;
2690 mddev
->major_version
= 0;
2691 mddev
->minor_version
= 90;
2694 major
= simple_strtoul(buf
, &e
, 10);
2695 if (e
==buf
|| *e
!= '.')
2698 minor
= simple_strtoul(buf
, &e
, 10);
2699 if (e
==buf
|| (*e
&& *e
!= '\n') )
2701 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2703 mddev
->major_version
= major
;
2704 mddev
->minor_version
= minor
;
2705 mddev
->persistent
= 1;
2709 static struct md_sysfs_entry md_metadata
=
2710 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2713 action_show(mddev_t
*mddev
, char *page
)
2715 char *type
= "idle";
2716 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2717 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2718 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2720 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2721 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2723 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2730 return sprintf(page
, "%s\n", type
);
2734 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2736 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2739 if (cmd_match(page
, "idle")) {
2740 if (mddev
->sync_thread
) {
2741 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2742 md_unregister_thread(mddev
->sync_thread
);
2743 mddev
->sync_thread
= NULL
;
2744 mddev
->recovery
= 0;
2746 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2747 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2749 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2750 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2751 else if (cmd_match(page
, "reshape")) {
2753 if (mddev
->pers
->start_reshape
== NULL
)
2755 err
= mddev
->pers
->start_reshape(mddev
);
2759 if (cmd_match(page
, "check"))
2760 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2761 else if (!cmd_match(page
, "repair"))
2763 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2764 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2766 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2767 md_wakeup_thread(mddev
->thread
);
2772 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2774 return sprintf(page
, "%llu\n",
2775 (unsigned long long) mddev
->resync_mismatches
);
2778 static struct md_sysfs_entry md_scan_mode
=
2779 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2782 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
2785 sync_min_show(mddev_t
*mddev
, char *page
)
2787 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2788 mddev
->sync_speed_min
? "local": "system");
2792 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2796 if (strncmp(buf
, "system", 6)==0) {
2797 mddev
->sync_speed_min
= 0;
2800 min
= simple_strtoul(buf
, &e
, 10);
2801 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2803 mddev
->sync_speed_min
= min
;
2807 static struct md_sysfs_entry md_sync_min
=
2808 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2811 sync_max_show(mddev_t
*mddev
, char *page
)
2813 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2814 mddev
->sync_speed_max
? "local": "system");
2818 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2822 if (strncmp(buf
, "system", 6)==0) {
2823 mddev
->sync_speed_max
= 0;
2826 max
= simple_strtoul(buf
, &e
, 10);
2827 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2829 mddev
->sync_speed_max
= max
;
2833 static struct md_sysfs_entry md_sync_max
=
2834 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2838 sync_speed_show(mddev_t
*mddev
, char *page
)
2840 unsigned long resync
, dt
, db
;
2841 resync
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
));
2842 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2844 db
= resync
- (mddev
->resync_mark_cnt
);
2845 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2848 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
2851 sync_completed_show(mddev_t
*mddev
, char *page
)
2853 unsigned long max_blocks
, resync
;
2855 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2856 max_blocks
= mddev
->resync_max_sectors
;
2858 max_blocks
= mddev
->size
<< 1;
2860 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2861 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2864 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
2867 suspend_lo_show(mddev_t
*mddev
, char *page
)
2869 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
2873 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2876 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2878 if (mddev
->pers
->quiesce
== NULL
)
2880 if (buf
== e
|| (*e
&& *e
!= '\n'))
2882 if (new >= mddev
->suspend_hi
||
2883 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
2884 mddev
->suspend_lo
= new;
2885 mddev
->pers
->quiesce(mddev
, 2);
2890 static struct md_sysfs_entry md_suspend_lo
=
2891 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
2895 suspend_hi_show(mddev_t
*mddev
, char *page
)
2897 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
2901 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2904 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2906 if (mddev
->pers
->quiesce
== NULL
)
2908 if (buf
== e
|| (*e
&& *e
!= '\n'))
2910 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
2911 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
2912 mddev
->suspend_hi
= new;
2913 mddev
->pers
->quiesce(mddev
, 1);
2914 mddev
->pers
->quiesce(mddev
, 0);
2919 static struct md_sysfs_entry md_suspend_hi
=
2920 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
2923 reshape_position_show(mddev_t
*mddev
, char *page
)
2925 if (mddev
->reshape_position
!= MaxSector
)
2926 return sprintf(page
, "%llu\n",
2927 (unsigned long long)mddev
->reshape_position
);
2928 strcpy(page
, "none\n");
2933 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2936 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2939 if (buf
== e
|| (*e
&& *e
!= '\n'))
2941 mddev
->reshape_position
= new;
2942 mddev
->delta_disks
= 0;
2943 mddev
->new_level
= mddev
->level
;
2944 mddev
->new_layout
= mddev
->layout
;
2945 mddev
->new_chunk
= mddev
->chunk_size
;
2949 static struct md_sysfs_entry md_reshape_position
=
2950 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
2951 reshape_position_store
);
2954 static struct attribute
*md_default_attrs
[] = {
2957 &md_raid_disks
.attr
,
2958 &md_chunk_size
.attr
,
2960 &md_resync_start
.attr
,
2962 &md_new_device
.attr
,
2963 &md_safe_delay
.attr
,
2964 &md_array_state
.attr
,
2965 &md_reshape_position
.attr
,
2969 static struct attribute
*md_redundancy_attrs
[] = {
2971 &md_mismatches
.attr
,
2974 &md_sync_speed
.attr
,
2975 &md_sync_completed
.attr
,
2976 &md_suspend_lo
.attr
,
2977 &md_suspend_hi
.attr
,
2981 static struct attribute_group md_redundancy_group
= {
2983 .attrs
= md_redundancy_attrs
,
2988 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2990 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2991 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2996 rv
= mddev_lock(mddev
);
2998 rv
= entry
->show(mddev
, page
);
2999 mddev_unlock(mddev
);
3005 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3006 const char *page
, size_t length
)
3008 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3009 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3014 if (!capable(CAP_SYS_ADMIN
))
3016 rv
= mddev_lock(mddev
);
3018 rv
= entry
->store(mddev
, page
, length
);
3019 mddev_unlock(mddev
);
3024 static void md_free(struct kobject
*ko
)
3026 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3030 static struct sysfs_ops md_sysfs_ops
= {
3031 .show
= md_attr_show
,
3032 .store
= md_attr_store
,
3034 static struct kobj_type md_ktype
= {
3036 .sysfs_ops
= &md_sysfs_ops
,
3037 .default_attrs
= md_default_attrs
,
3042 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3044 static DEFINE_MUTEX(disks_mutex
);
3045 mddev_t
*mddev
= mddev_find(dev
);
3046 struct gendisk
*disk
;
3047 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3048 int shift
= partitioned
? MdpMinorShift
: 0;
3049 int unit
= MINOR(dev
) >> shift
;
3054 mutex_lock(&disks_mutex
);
3055 if (mddev
->gendisk
) {
3056 mutex_unlock(&disks_mutex
);
3060 disk
= alloc_disk(1 << shift
);
3062 mutex_unlock(&disks_mutex
);
3066 disk
->major
= MAJOR(dev
);
3067 disk
->first_minor
= unit
<< shift
;
3069 sprintf(disk
->disk_name
, "md_d%d", unit
);
3071 sprintf(disk
->disk_name
, "md%d", unit
);
3072 disk
->fops
= &md_fops
;
3073 disk
->private_data
= mddev
;
3074 disk
->queue
= mddev
->queue
;
3076 mddev
->gendisk
= disk
;
3077 mutex_unlock(&disks_mutex
);
3078 mddev
->kobj
.parent
= &disk
->kobj
;
3079 mddev
->kobj
.k_name
= NULL
;
3080 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
3081 mddev
->kobj
.ktype
= &md_ktype
;
3082 if (kobject_register(&mddev
->kobj
))
3083 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3088 static void md_safemode_timeout(unsigned long data
)
3090 mddev_t
*mddev
= (mddev_t
*) data
;
3092 mddev
->safemode
= 1;
3093 md_wakeup_thread(mddev
->thread
);
3096 static int start_dirty_degraded
;
3098 static int do_md_run(mddev_t
* mddev
)
3102 struct list_head
*tmp
;
3104 struct gendisk
*disk
;
3105 struct mdk_personality
*pers
;
3106 char b
[BDEVNAME_SIZE
];
3108 if (list_empty(&mddev
->disks
))
3109 /* cannot run an array with no devices.. */
3116 * Analyze all RAID superblock(s)
3118 if (!mddev
->raid_disks
)
3121 chunk_size
= mddev
->chunk_size
;
3124 if (chunk_size
> MAX_CHUNK_SIZE
) {
3125 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3126 chunk_size
, MAX_CHUNK_SIZE
);
3130 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3132 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3133 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3136 if (chunk_size
< PAGE_SIZE
) {
3137 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3138 chunk_size
, PAGE_SIZE
);
3142 /* devices must have minimum size of one chunk */
3143 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3144 if (test_bit(Faulty
, &rdev
->flags
))
3146 if (rdev
->size
< chunk_size
/ 1024) {
3148 "md: Dev %s smaller than chunk_size:"
3150 bdevname(rdev
->bdev
,b
),
3151 (unsigned long long)rdev
->size
,
3159 if (mddev
->level
!= LEVEL_NONE
)
3160 request_module("md-level-%d", mddev
->level
);
3161 else if (mddev
->clevel
[0])
3162 request_module("md-%s", mddev
->clevel
);
3166 * Drop all container device buffers, from now on
3167 * the only valid external interface is through the md
3170 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3171 if (test_bit(Faulty
, &rdev
->flags
))
3173 sync_blockdev(rdev
->bdev
);
3174 invalidate_bdev(rdev
->bdev
);
3176 /* perform some consistency tests on the device.
3177 * We don't want the data to overlap the metadata,
3178 * Internal Bitmap issues has handled elsewhere.
3180 if (rdev
->data_offset
< rdev
->sb_offset
) {
3182 rdev
->data_offset
+ mddev
->size
*2
3183 > rdev
->sb_offset
*2) {
3184 printk("md: %s: data overlaps metadata\n",
3189 if (rdev
->sb_offset
*2 + rdev
->sb_size
/512
3190 > rdev
->data_offset
) {
3191 printk("md: %s: metadata overlaps data\n",
3198 md_probe(mddev
->unit
, NULL
, NULL
);
3199 disk
= mddev
->gendisk
;
3203 spin_lock(&pers_lock
);
3204 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3205 if (!pers
|| !try_module_get(pers
->owner
)) {
3206 spin_unlock(&pers_lock
);
3207 if (mddev
->level
!= LEVEL_NONE
)
3208 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3211 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3216 spin_unlock(&pers_lock
);
3217 mddev
->level
= pers
->level
;
3218 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3220 if (mddev
->reshape_position
!= MaxSector
&&
3221 pers
->start_reshape
== NULL
) {
3222 /* This personality cannot handle reshaping... */
3224 module_put(pers
->owner
);
3228 if (pers
->sync_request
) {
3229 /* Warn if this is a potentially silly
3232 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3234 struct list_head
*tmp2
;
3236 ITERATE_RDEV(mddev
, rdev
, tmp
) {
3237 ITERATE_RDEV(mddev
, rdev2
, tmp2
) {
3239 rdev
->bdev
->bd_contains
==
3240 rdev2
->bdev
->bd_contains
) {
3242 "%s: WARNING: %s appears to be"
3243 " on the same physical disk as"
3246 bdevname(rdev
->bdev
,b
),
3247 bdevname(rdev2
->bdev
,b2
));
3254 "True protection against single-disk"
3255 " failure might be compromised.\n");
3258 mddev
->recovery
= 0;
3259 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3260 mddev
->barriers_work
= 1;
3261 mddev
->ok_start_degraded
= start_dirty_degraded
;
3264 mddev
->ro
= 2; /* read-only, but switch on first write */
3266 err
= mddev
->pers
->run(mddev
);
3267 if (!err
&& mddev
->pers
->sync_request
) {
3268 err
= bitmap_create(mddev
);
3270 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3271 mdname(mddev
), err
);
3272 mddev
->pers
->stop(mddev
);
3276 printk(KERN_ERR
"md: pers->run() failed ...\n");
3277 module_put(mddev
->pers
->owner
);
3279 bitmap_destroy(mddev
);
3282 if (mddev
->pers
->sync_request
) {
3283 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3285 "md: cannot register extra attributes for %s\n",
3287 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3290 atomic_set(&mddev
->writes_pending
,0);
3291 mddev
->safemode
= 0;
3292 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3293 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3294 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3297 ITERATE_RDEV(mddev
,rdev
,tmp
)
3298 if (rdev
->raid_disk
>= 0) {
3300 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3301 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3302 printk("md: cannot register %s for %s\n",
3306 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3309 md_update_sb(mddev
, 0);
3311 set_capacity(disk
, mddev
->array_size
<<1);
3313 /* If we call blk_queue_make_request here, it will
3314 * re-initialise max_sectors etc which may have been
3315 * refined inside -> run. So just set the bits we need to set.
3316 * Most initialisation happended when we called
3317 * blk_queue_make_request(..., md_fail_request)
3320 mddev
->queue
->queuedata
= mddev
;
3321 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3323 /* If there is a partially-recovered drive we need to
3324 * start recovery here. If we leave it to md_check_recovery,
3325 * it will remove the drives and not do the right thing
3327 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3328 struct list_head
*rtmp
;
3330 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3331 if (rdev
->raid_disk
>= 0 &&
3332 !test_bit(In_sync
, &rdev
->flags
) &&
3333 !test_bit(Faulty
, &rdev
->flags
))
3334 /* complete an interrupted recovery */
3336 if (spares
&& mddev
->pers
->sync_request
) {
3337 mddev
->recovery
= 0;
3338 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3339 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3342 if (!mddev
->sync_thread
) {
3343 printk(KERN_ERR
"%s: could not start resync"
3346 /* leave the spares where they are, it shouldn't hurt */
3347 mddev
->recovery
= 0;
3351 md_wakeup_thread(mddev
->thread
);
3352 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3355 md_new_event(mddev
);
3356 kobject_uevent(&mddev
->gendisk
->kobj
, KOBJ_CHANGE
);
3360 static int restart_array(mddev_t
*mddev
)
3362 struct gendisk
*disk
= mddev
->gendisk
;
3366 * Complain if it has no devices
3369 if (list_empty(&mddev
->disks
))
3377 mddev
->safemode
= 0;
3379 set_disk_ro(disk
, 0);
3381 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3384 * Kick recovery or resync if necessary
3386 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3387 md_wakeup_thread(mddev
->thread
);
3388 md_wakeup_thread(mddev
->sync_thread
);
3397 /* similar to deny_write_access, but accounts for our holding a reference
3398 * to the file ourselves */
3399 static int deny_bitmap_write_access(struct file
* file
)
3401 struct inode
*inode
= file
->f_mapping
->host
;
3403 spin_lock(&inode
->i_lock
);
3404 if (atomic_read(&inode
->i_writecount
) > 1) {
3405 spin_unlock(&inode
->i_lock
);
3408 atomic_set(&inode
->i_writecount
, -1);
3409 spin_unlock(&inode
->i_lock
);
3414 static void restore_bitmap_write_access(struct file
*file
)
3416 struct inode
*inode
= file
->f_mapping
->host
;
3418 spin_lock(&inode
->i_lock
);
3419 atomic_set(&inode
->i_writecount
, 1);
3420 spin_unlock(&inode
->i_lock
);
3424 * 0 - completely stop and dis-assemble array
3425 * 1 - switch to readonly
3426 * 2 - stop but do not disassemble array
3428 static int do_md_stop(mddev_t
* mddev
, int mode
)
3431 struct gendisk
*disk
= mddev
->gendisk
;
3434 if (atomic_read(&mddev
->active
)>2) {
3435 printk("md: %s still in use.\n",mdname(mddev
));
3439 if (mddev
->sync_thread
) {
3440 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3441 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3442 md_unregister_thread(mddev
->sync_thread
);
3443 mddev
->sync_thread
= NULL
;
3446 del_timer_sync(&mddev
->safemode_timer
);
3448 invalidate_partition(disk
, 0);
3451 case 1: /* readonly */
3457 case 0: /* disassemble */
3459 bitmap_flush(mddev
);
3460 md_super_wait(mddev
);
3462 set_disk_ro(disk
, 0);
3463 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3464 mddev
->pers
->stop(mddev
);
3465 mddev
->queue
->merge_bvec_fn
= NULL
;
3466 mddev
->queue
->unplug_fn
= NULL
;
3467 mddev
->queue
->issue_flush_fn
= NULL
;
3468 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3469 if (mddev
->pers
->sync_request
)
3470 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3472 module_put(mddev
->pers
->owner
);
3475 set_capacity(disk
, 0);
3481 if (!mddev
->in_sync
|| mddev
->flags
) {
3482 /* mark array as shutdown cleanly */
3484 md_update_sb(mddev
, 1);
3487 set_disk_ro(disk
, 1);
3488 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3492 * Free resources if final stop
3496 struct list_head
*tmp
;
3498 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3500 bitmap_destroy(mddev
);
3501 if (mddev
->bitmap_file
) {
3502 restore_bitmap_write_access(mddev
->bitmap_file
);
3503 fput(mddev
->bitmap_file
);
3504 mddev
->bitmap_file
= NULL
;
3506 mddev
->bitmap_offset
= 0;
3508 ITERATE_RDEV(mddev
,rdev
,tmp
)
3509 if (rdev
->raid_disk
>= 0) {
3511 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3512 sysfs_remove_link(&mddev
->kobj
, nm
);
3515 /* make sure all delayed_delete calls have finished */
3516 flush_scheduled_work();
3518 export_array(mddev
);
3520 mddev
->array_size
= 0;
3522 mddev
->raid_disks
= 0;
3523 mddev
->recovery_cp
= 0;
3524 mddev
->reshape_position
= MaxSector
;
3526 } else if (mddev
->pers
)
3527 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3530 md_new_event(mddev
);
3536 static void autorun_array(mddev_t
*mddev
)
3539 struct list_head
*tmp
;
3542 if (list_empty(&mddev
->disks
))
3545 printk(KERN_INFO
"md: running: ");
3547 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3548 char b
[BDEVNAME_SIZE
];
3549 printk("<%s>", bdevname(rdev
->bdev
,b
));
3553 err
= do_md_run (mddev
);
3555 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3556 do_md_stop (mddev
, 0);
3561 * lets try to run arrays based on all disks that have arrived
3562 * until now. (those are in pending_raid_disks)
3564 * the method: pick the first pending disk, collect all disks with
3565 * the same UUID, remove all from the pending list and put them into
3566 * the 'same_array' list. Then order this list based on superblock
3567 * update time (freshest comes first), kick out 'old' disks and
3568 * compare superblocks. If everything's fine then run it.
3570 * If "unit" is allocated, then bump its reference count
3572 static void autorun_devices(int part
)
3574 struct list_head
*tmp
;
3575 mdk_rdev_t
*rdev0
, *rdev
;
3577 char b
[BDEVNAME_SIZE
];
3579 printk(KERN_INFO
"md: autorun ...\n");
3580 while (!list_empty(&pending_raid_disks
)) {
3583 LIST_HEAD(candidates
);
3584 rdev0
= list_entry(pending_raid_disks
.next
,
3585 mdk_rdev_t
, same_set
);
3587 printk(KERN_INFO
"md: considering %s ...\n",
3588 bdevname(rdev0
->bdev
,b
));
3589 INIT_LIST_HEAD(&candidates
);
3590 ITERATE_RDEV_PENDING(rdev
,tmp
)
3591 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3592 printk(KERN_INFO
"md: adding %s ...\n",
3593 bdevname(rdev
->bdev
,b
));
3594 list_move(&rdev
->same_set
, &candidates
);
3597 * now we have a set of devices, with all of them having
3598 * mostly sane superblocks. It's time to allocate the
3602 dev
= MKDEV(mdp_major
,
3603 rdev0
->preferred_minor
<< MdpMinorShift
);
3604 unit
= MINOR(dev
) >> MdpMinorShift
;
3606 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
3609 if (rdev0
->preferred_minor
!= unit
) {
3610 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
3611 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
3615 md_probe(dev
, NULL
, NULL
);
3616 mddev
= mddev_find(dev
);
3619 "md: cannot allocate memory for md drive.\n");
3622 if (mddev_lock(mddev
))
3623 printk(KERN_WARNING
"md: %s locked, cannot run\n",
3625 else if (mddev
->raid_disks
|| mddev
->major_version
3626 || !list_empty(&mddev
->disks
)) {
3628 "md: %s already running, cannot run %s\n",
3629 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
3630 mddev_unlock(mddev
);
3632 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
3633 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
3634 list_del_init(&rdev
->same_set
);
3635 if (bind_rdev_to_array(rdev
, mddev
))
3638 autorun_array(mddev
);
3639 mddev_unlock(mddev
);
3641 /* on success, candidates will be empty, on error
3644 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
3648 printk(KERN_INFO
"md: ... autorun DONE.\n");
3650 #endif /* !MODULE */
3652 static int get_version(void __user
* arg
)
3656 ver
.major
= MD_MAJOR_VERSION
;
3657 ver
.minor
= MD_MINOR_VERSION
;
3658 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3660 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3666 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3668 mdu_array_info_t info
;
3669 int nr
,working
,active
,failed
,spare
;
3671 struct list_head
*tmp
;
3673 nr
=working
=active
=failed
=spare
=0;
3674 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3676 if (test_bit(Faulty
, &rdev
->flags
))
3680 if (test_bit(In_sync
, &rdev
->flags
))
3687 info
.major_version
= mddev
->major_version
;
3688 info
.minor_version
= mddev
->minor_version
;
3689 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3690 info
.ctime
= mddev
->ctime
;
3691 info
.level
= mddev
->level
;
3692 info
.size
= mddev
->size
;
3693 if (info
.size
!= mddev
->size
) /* overflow */
3696 info
.raid_disks
= mddev
->raid_disks
;
3697 info
.md_minor
= mddev
->md_minor
;
3698 info
.not_persistent
= !mddev
->persistent
;
3700 info
.utime
= mddev
->utime
;
3703 info
.state
= (1<<MD_SB_CLEAN
);
3704 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3705 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3706 info
.active_disks
= active
;
3707 info
.working_disks
= working
;
3708 info
.failed_disks
= failed
;
3709 info
.spare_disks
= spare
;
3711 info
.layout
= mddev
->layout
;
3712 info
.chunk_size
= mddev
->chunk_size
;
3714 if (copy_to_user(arg
, &info
, sizeof(info
)))
3720 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3722 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3723 char *ptr
, *buf
= NULL
;
3726 md_allow_write(mddev
);
3728 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3732 /* bitmap disabled, zero the first byte and copy out */
3733 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3734 file
->pathname
[0] = '\0';
3738 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3742 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3746 strcpy(file
->pathname
, ptr
);
3750 if (copy_to_user(arg
, file
, sizeof(*file
)))
3758 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3760 mdu_disk_info_t info
;
3764 if (copy_from_user(&info
, arg
, sizeof(info
)))
3769 rdev
= find_rdev_nr(mddev
, nr
);
3771 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3772 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3773 info
.raid_disk
= rdev
->raid_disk
;
3775 if (test_bit(Faulty
, &rdev
->flags
))
3776 info
.state
|= (1<<MD_DISK_FAULTY
);
3777 else if (test_bit(In_sync
, &rdev
->flags
)) {
3778 info
.state
|= (1<<MD_DISK_ACTIVE
);
3779 info
.state
|= (1<<MD_DISK_SYNC
);
3781 if (test_bit(WriteMostly
, &rdev
->flags
))
3782 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3784 info
.major
= info
.minor
= 0;
3785 info
.raid_disk
= -1;
3786 info
.state
= (1<<MD_DISK_REMOVED
);
3789 if (copy_to_user(arg
, &info
, sizeof(info
)))
3795 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3797 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3799 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3801 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3804 if (!mddev
->raid_disks
) {
3806 /* expecting a device which has a superblock */
3807 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3810 "md: md_import_device returned %ld\n",
3812 return PTR_ERR(rdev
);
3814 if (!list_empty(&mddev
->disks
)) {
3815 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3816 mdk_rdev_t
, same_set
);
3817 int err
= super_types
[mddev
->major_version
]
3818 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3821 "md: %s has different UUID to %s\n",
3822 bdevname(rdev
->bdev
,b
),
3823 bdevname(rdev0
->bdev
,b2
));
3828 err
= bind_rdev_to_array(rdev
, mddev
);
3835 * add_new_disk can be used once the array is assembled
3836 * to add "hot spares". They must already have a superblock
3841 if (!mddev
->pers
->hot_add_disk
) {
3843 "%s: personality does not support diskops!\n",
3847 if (mddev
->persistent
)
3848 rdev
= md_import_device(dev
, mddev
->major_version
,
3849 mddev
->minor_version
);
3851 rdev
= md_import_device(dev
, -1, -1);
3854 "md: md_import_device returned %ld\n",
3856 return PTR_ERR(rdev
);
3858 /* set save_raid_disk if appropriate */
3859 if (!mddev
->persistent
) {
3860 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3861 info
->raid_disk
< mddev
->raid_disks
)
3862 rdev
->raid_disk
= info
->raid_disk
;
3864 rdev
->raid_disk
= -1;
3866 super_types
[mddev
->major_version
].
3867 validate_super(mddev
, rdev
);
3868 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3870 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3871 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3872 set_bit(WriteMostly
, &rdev
->flags
);
3874 rdev
->raid_disk
= -1;
3875 err
= bind_rdev_to_array(rdev
, mddev
);
3876 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
3877 /* If there is hot_add_disk but no hot_remove_disk
3878 * then added disks for geometry changes,
3879 * and should be added immediately.
3881 super_types
[mddev
->major_version
].
3882 validate_super(mddev
, rdev
);
3883 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
3885 unbind_rdev_from_array(rdev
);
3890 md_update_sb(mddev
, 1);
3891 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3892 md_wakeup_thread(mddev
->thread
);
3896 /* otherwise, add_new_disk is only allowed
3897 * for major_version==0 superblocks
3899 if (mddev
->major_version
!= 0) {
3900 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3905 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3907 rdev
= md_import_device (dev
, -1, 0);
3910 "md: error, md_import_device() returned %ld\n",
3912 return PTR_ERR(rdev
);
3914 rdev
->desc_nr
= info
->number
;
3915 if (info
->raid_disk
< mddev
->raid_disks
)
3916 rdev
->raid_disk
= info
->raid_disk
;
3918 rdev
->raid_disk
= -1;
3922 if (rdev
->raid_disk
< mddev
->raid_disks
)
3923 if (info
->state
& (1<<MD_DISK_SYNC
))
3924 set_bit(In_sync
, &rdev
->flags
);
3926 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3927 set_bit(WriteMostly
, &rdev
->flags
);
3929 if (!mddev
->persistent
) {
3930 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3931 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3933 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3934 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3936 err
= bind_rdev_to_array(rdev
, mddev
);
3946 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3948 char b
[BDEVNAME_SIZE
];
3954 rdev
= find_rdev(mddev
, dev
);
3958 if (rdev
->raid_disk
>= 0)
3961 kick_rdev_from_array(rdev
);
3962 md_update_sb(mddev
, 1);
3963 md_new_event(mddev
);
3967 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3968 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3972 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3974 char b
[BDEVNAME_SIZE
];
3982 if (mddev
->major_version
!= 0) {
3983 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3984 " version-0 superblocks.\n",
3988 if (!mddev
->pers
->hot_add_disk
) {
3990 "%s: personality does not support diskops!\n",
3995 rdev
= md_import_device (dev
, -1, 0);
3998 "md: error, md_import_device() returned %ld\n",
4003 if (mddev
->persistent
)
4004 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
4007 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
4009 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4012 if (test_bit(Faulty
, &rdev
->flags
)) {
4014 "md: can not hot-add faulty %s disk to %s!\n",
4015 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4019 clear_bit(In_sync
, &rdev
->flags
);
4021 rdev
->saved_raid_disk
= -1;
4022 err
= bind_rdev_to_array(rdev
, mddev
);
4027 * The rest should better be atomic, we can have disk failures
4028 * noticed in interrupt contexts ...
4031 if (rdev
->desc_nr
== mddev
->max_disks
) {
4032 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4035 goto abort_unbind_export
;
4038 rdev
->raid_disk
= -1;
4040 md_update_sb(mddev
, 1);
4043 * Kick recovery, maybe this spare has to be added to the
4044 * array immediately.
4046 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4047 md_wakeup_thread(mddev
->thread
);
4048 md_new_event(mddev
);
4051 abort_unbind_export
:
4052 unbind_rdev_from_array(rdev
);
4059 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4064 if (!mddev
->pers
->quiesce
)
4066 if (mddev
->recovery
|| mddev
->sync_thread
)
4068 /* we should be able to change the bitmap.. */
4074 return -EEXIST
; /* cannot add when bitmap is present */
4075 mddev
->bitmap_file
= fget(fd
);
4077 if (mddev
->bitmap_file
== NULL
) {
4078 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4083 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4085 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4087 fput(mddev
->bitmap_file
);
4088 mddev
->bitmap_file
= NULL
;
4091 mddev
->bitmap_offset
= 0; /* file overrides offset */
4092 } else if (mddev
->bitmap
== NULL
)
4093 return -ENOENT
; /* cannot remove what isn't there */
4096 mddev
->pers
->quiesce(mddev
, 1);
4098 err
= bitmap_create(mddev
);
4099 if (fd
< 0 || err
) {
4100 bitmap_destroy(mddev
);
4101 fd
= -1; /* make sure to put the file */
4103 mddev
->pers
->quiesce(mddev
, 0);
4106 if (mddev
->bitmap_file
) {
4107 restore_bitmap_write_access(mddev
->bitmap_file
);
4108 fput(mddev
->bitmap_file
);
4110 mddev
->bitmap_file
= NULL
;
4117 * set_array_info is used two different ways
4118 * The original usage is when creating a new array.
4119 * In this usage, raid_disks is > 0 and it together with
4120 * level, size, not_persistent,layout,chunksize determine the
4121 * shape of the array.
4122 * This will always create an array with a type-0.90.0 superblock.
4123 * The newer usage is when assembling an array.
4124 * In this case raid_disks will be 0, and the major_version field is
4125 * use to determine which style super-blocks are to be found on the devices.
4126 * The minor and patch _version numbers are also kept incase the
4127 * super_block handler wishes to interpret them.
4129 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4132 if (info
->raid_disks
== 0) {
4133 /* just setting version number for superblock loading */
4134 if (info
->major_version
< 0 ||
4135 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4136 super_types
[info
->major_version
].name
== NULL
) {
4137 /* maybe try to auto-load a module? */
4139 "md: superblock version %d not known\n",
4140 info
->major_version
);
4143 mddev
->major_version
= info
->major_version
;
4144 mddev
->minor_version
= info
->minor_version
;
4145 mddev
->patch_version
= info
->patch_version
;
4146 mddev
->persistent
= !info
->not_persistent
;
4149 mddev
->major_version
= MD_MAJOR_VERSION
;
4150 mddev
->minor_version
= MD_MINOR_VERSION
;
4151 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4152 mddev
->ctime
= get_seconds();
4154 mddev
->level
= info
->level
;
4155 mddev
->clevel
[0] = 0;
4156 mddev
->size
= info
->size
;
4157 mddev
->raid_disks
= info
->raid_disks
;
4158 /* don't set md_minor, it is determined by which /dev/md* was
4161 if (info
->state
& (1<<MD_SB_CLEAN
))
4162 mddev
->recovery_cp
= MaxSector
;
4164 mddev
->recovery_cp
= 0;
4165 mddev
->persistent
= ! info
->not_persistent
;
4167 mddev
->layout
= info
->layout
;
4168 mddev
->chunk_size
= info
->chunk_size
;
4170 mddev
->max_disks
= MD_SB_DISKS
;
4173 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4175 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4176 mddev
->bitmap_offset
= 0;
4178 mddev
->reshape_position
= MaxSector
;
4181 * Generate a 128 bit UUID
4183 get_random_bytes(mddev
->uuid
, 16);
4185 mddev
->new_level
= mddev
->level
;
4186 mddev
->new_chunk
= mddev
->chunk_size
;
4187 mddev
->new_layout
= mddev
->layout
;
4188 mddev
->delta_disks
= 0;
4193 static int update_size(mddev_t
*mddev
, unsigned long size
)
4197 struct list_head
*tmp
;
4198 int fit
= (size
== 0);
4200 if (mddev
->pers
->resize
== NULL
)
4202 /* The "size" is the amount of each device that is used.
4203 * This can only make sense for arrays with redundancy.
4204 * linear and raid0 always use whatever space is available
4205 * We can only consider changing the size if no resync
4206 * or reconstruction is happening, and if the new size
4207 * is acceptable. It must fit before the sb_offset or,
4208 * if that is <data_offset, it must fit before the
4209 * size of each device.
4210 * If size is zero, we find the largest size that fits.
4212 if (mddev
->sync_thread
)
4214 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4216 avail
= rdev
->size
* 2;
4218 if (fit
&& (size
== 0 || size
> avail
/2))
4220 if (avail
< ((sector_t
)size
<< 1))
4223 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4225 struct block_device
*bdev
;
4227 bdev
= bdget_disk(mddev
->gendisk
, 0);
4229 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4230 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4231 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4238 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4241 /* change the number of raid disks */
4242 if (mddev
->pers
->check_reshape
== NULL
)
4244 if (raid_disks
<= 0 ||
4245 raid_disks
>= mddev
->max_disks
)
4247 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4249 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4251 rv
= mddev
->pers
->check_reshape(mddev
);
4257 * update_array_info is used to change the configuration of an
4259 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4260 * fields in the info are checked against the array.
4261 * Any differences that cannot be handled will cause an error.
4262 * Normally, only one change can be managed at a time.
4264 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4270 /* calculate expected state,ignoring low bits */
4271 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4272 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4274 if (mddev
->major_version
!= info
->major_version
||
4275 mddev
->minor_version
!= info
->minor_version
||
4276 /* mddev->patch_version != info->patch_version || */
4277 mddev
->ctime
!= info
->ctime
||
4278 mddev
->level
!= info
->level
||
4279 /* mddev->layout != info->layout || */
4280 !mddev
->persistent
!= info
->not_persistent
||
4281 mddev
->chunk_size
!= info
->chunk_size
||
4282 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4283 ((state
^info
->state
) & 0xfffffe00)
4286 /* Check there is only one change */
4287 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4288 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4289 if (mddev
->layout
!= info
->layout
) cnt
++;
4290 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4291 if (cnt
== 0) return 0;
4292 if (cnt
> 1) return -EINVAL
;
4294 if (mddev
->layout
!= info
->layout
) {
4296 * we don't need to do anything at the md level, the
4297 * personality will take care of it all.
4299 if (mddev
->pers
->reconfig
== NULL
)
4302 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4304 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4305 rv
= update_size(mddev
, info
->size
);
4307 if (mddev
->raid_disks
!= info
->raid_disks
)
4308 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4310 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4311 if (mddev
->pers
->quiesce
== NULL
)
4313 if (mddev
->recovery
|| mddev
->sync_thread
)
4315 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4316 /* add the bitmap */
4319 if (mddev
->default_bitmap_offset
== 0)
4321 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4322 mddev
->pers
->quiesce(mddev
, 1);
4323 rv
= bitmap_create(mddev
);
4325 bitmap_destroy(mddev
);
4326 mddev
->pers
->quiesce(mddev
, 0);
4328 /* remove the bitmap */
4331 if (mddev
->bitmap
->file
)
4333 mddev
->pers
->quiesce(mddev
, 1);
4334 bitmap_destroy(mddev
);
4335 mddev
->pers
->quiesce(mddev
, 0);
4336 mddev
->bitmap_offset
= 0;
4339 md_update_sb(mddev
, 1);
4343 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4347 if (mddev
->pers
== NULL
)
4350 rdev
= find_rdev(mddev
, dev
);
4354 md_error(mddev
, rdev
);
4358 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4360 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4364 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4368 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4369 unsigned int cmd
, unsigned long arg
)
4372 void __user
*argp
= (void __user
*)arg
;
4373 mddev_t
*mddev
= NULL
;
4375 if (!capable(CAP_SYS_ADMIN
))
4379 * Commands dealing with the RAID driver but not any
4385 err
= get_version(argp
);
4388 case PRINT_RAID_DEBUG
:
4396 autostart_arrays(arg
);
4403 * Commands creating/starting a new array:
4406 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4413 err
= mddev_lock(mddev
);
4416 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4423 case SET_ARRAY_INFO
:
4425 mdu_array_info_t info
;
4427 memset(&info
, 0, sizeof(info
));
4428 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4433 err
= update_array_info(mddev
, &info
);
4435 printk(KERN_WARNING
"md: couldn't update"
4436 " array info. %d\n", err
);
4441 if (!list_empty(&mddev
->disks
)) {
4443 "md: array %s already has disks!\n",
4448 if (mddev
->raid_disks
) {
4450 "md: array %s already initialised!\n",
4455 err
= set_array_info(mddev
, &info
);
4457 printk(KERN_WARNING
"md: couldn't set"
4458 " array info. %d\n", err
);
4468 * Commands querying/configuring an existing array:
4470 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4471 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4472 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4473 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4474 && cmd
!= GET_BITMAP_FILE
) {
4480 * Commands even a read-only array can execute:
4484 case GET_ARRAY_INFO
:
4485 err
= get_array_info(mddev
, argp
);
4488 case GET_BITMAP_FILE
:
4489 err
= get_bitmap_file(mddev
, argp
);
4493 err
= get_disk_info(mddev
, argp
);
4496 case RESTART_ARRAY_RW
:
4497 err
= restart_array(mddev
);
4501 err
= do_md_stop (mddev
, 0);
4505 err
= do_md_stop (mddev
, 1);
4509 * We have a problem here : there is no easy way to give a CHS
4510 * virtual geometry. We currently pretend that we have a 2 heads
4511 * 4 sectors (with a BIG number of cylinders...). This drives
4512 * dosfs just mad... ;-)
4517 * The remaining ioctls are changing the state of the
4518 * superblock, so we do not allow them on read-only arrays.
4519 * However non-MD ioctls (e.g. get-size) will still come through
4520 * here and hit the 'default' below, so only disallow
4521 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4523 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
4524 mddev
->ro
&& mddev
->pers
) {
4525 if (mddev
->ro
== 2) {
4527 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4528 md_wakeup_thread(mddev
->thread
);
4540 mdu_disk_info_t info
;
4541 if (copy_from_user(&info
, argp
, sizeof(info
)))
4544 err
= add_new_disk(mddev
, &info
);
4548 case HOT_REMOVE_DISK
:
4549 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4553 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4556 case SET_DISK_FAULTY
:
4557 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4561 err
= do_md_run (mddev
);
4564 case SET_BITMAP_FILE
:
4565 err
= set_bitmap_file(mddev
, (int)arg
);
4575 mddev_unlock(mddev
);
4585 static int md_open(struct inode
*inode
, struct file
*file
)
4588 * Succeed if we can lock the mddev, which confirms that
4589 * it isn't being stopped right now.
4591 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4594 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
4599 mddev_unlock(mddev
);
4601 check_disk_change(inode
->i_bdev
);
4606 static int md_release(struct inode
*inode
, struct file
* file
)
4608 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4616 static int md_media_changed(struct gendisk
*disk
)
4618 mddev_t
*mddev
= disk
->private_data
;
4620 return mddev
->changed
;
4623 static int md_revalidate(struct gendisk
*disk
)
4625 mddev_t
*mddev
= disk
->private_data
;
4630 static struct block_device_operations md_fops
=
4632 .owner
= THIS_MODULE
,
4634 .release
= md_release
,
4636 .getgeo
= md_getgeo
,
4637 .media_changed
= md_media_changed
,
4638 .revalidate_disk
= md_revalidate
,
4641 static int md_thread(void * arg
)
4643 mdk_thread_t
*thread
= arg
;
4646 * md_thread is a 'system-thread', it's priority should be very
4647 * high. We avoid resource deadlocks individually in each
4648 * raid personality. (RAID5 does preallocation) We also use RR and
4649 * the very same RT priority as kswapd, thus we will never get
4650 * into a priority inversion deadlock.
4652 * we definitely have to have equal or higher priority than
4653 * bdflush, otherwise bdflush will deadlock if there are too
4654 * many dirty RAID5 blocks.
4657 allow_signal(SIGKILL
);
4658 while (!kthread_should_stop()) {
4660 /* We need to wait INTERRUPTIBLE so that
4661 * we don't add to the load-average.
4662 * That means we need to be sure no signals are
4665 if (signal_pending(current
))
4666 flush_signals(current
);
4668 wait_event_interruptible_timeout
4670 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4671 || kthread_should_stop(),
4674 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4676 thread
->run(thread
->mddev
);
4682 void md_wakeup_thread(mdk_thread_t
*thread
)
4685 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4686 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4687 wake_up(&thread
->wqueue
);
4691 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4694 mdk_thread_t
*thread
;
4696 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4700 init_waitqueue_head(&thread
->wqueue
);
4703 thread
->mddev
= mddev
;
4704 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4705 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4706 if (IS_ERR(thread
->tsk
)) {
4713 void md_unregister_thread(mdk_thread_t
*thread
)
4715 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
4717 kthread_stop(thread
->tsk
);
4721 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4728 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4731 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4733 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4734 __builtin_return_address(0),__builtin_return_address(1),
4735 __builtin_return_address(2),__builtin_return_address(3));
4739 if (!mddev
->pers
->error_handler
)
4741 mddev
->pers
->error_handler(mddev
,rdev
);
4742 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4743 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4744 md_wakeup_thread(mddev
->thread
);
4745 md_new_event_inintr(mddev
);
4748 /* seq_file implementation /proc/mdstat */
4750 static void status_unused(struct seq_file
*seq
)
4754 struct list_head
*tmp
;
4756 seq_printf(seq
, "unused devices: ");
4758 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4759 char b
[BDEVNAME_SIZE
];
4761 seq_printf(seq
, "%s ",
4762 bdevname(rdev
->bdev
,b
));
4765 seq_printf(seq
, "<none>");
4767 seq_printf(seq
, "\n");
4771 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4773 sector_t max_blocks
, resync
, res
;
4774 unsigned long dt
, db
, rt
;
4776 unsigned int per_milli
;
4778 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4780 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4781 max_blocks
= mddev
->resync_max_sectors
>> 1;
4783 max_blocks
= mddev
->size
;
4786 * Should not happen.
4792 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4793 * in a sector_t, and (max_blocks>>scale) will fit in a
4794 * u32, as those are the requirements for sector_div.
4795 * Thus 'scale' must be at least 10
4798 if (sizeof(sector_t
) > sizeof(unsigned long)) {
4799 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
4802 res
= (resync
>>scale
)*1000;
4803 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
4807 int i
, x
= per_milli
/50, y
= 20-x
;
4808 seq_printf(seq
, "[");
4809 for (i
= 0; i
< x
; i
++)
4810 seq_printf(seq
, "=");
4811 seq_printf(seq
, ">");
4812 for (i
= 0; i
< y
; i
++)
4813 seq_printf(seq
, ".");
4814 seq_printf(seq
, "] ");
4816 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
4817 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
4819 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
4821 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4822 "resync" : "recovery"))),
4823 per_milli
/10, per_milli
% 10,
4824 (unsigned long long) resync
,
4825 (unsigned long long) max_blocks
);
4828 * We do not want to overflow, so the order of operands and
4829 * the * 100 / 100 trick are important. We do a +1 to be
4830 * safe against division by zero. We only estimate anyway.
4832 * dt: time from mark until now
4833 * db: blocks written from mark until now
4834 * rt: remaining time
4836 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4838 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
4839 - mddev
->resync_mark_cnt
;
4840 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
4842 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4844 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
4847 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4849 struct list_head
*tmp
;
4859 spin_lock(&all_mddevs_lock
);
4860 list_for_each(tmp
,&all_mddevs
)
4862 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4864 spin_unlock(&all_mddevs_lock
);
4867 spin_unlock(&all_mddevs_lock
);
4869 return (void*)2;/* tail */
4873 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4875 struct list_head
*tmp
;
4876 mddev_t
*next_mddev
, *mddev
= v
;
4882 spin_lock(&all_mddevs_lock
);
4884 tmp
= all_mddevs
.next
;
4886 tmp
= mddev
->all_mddevs
.next
;
4887 if (tmp
!= &all_mddevs
)
4888 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4890 next_mddev
= (void*)2;
4893 spin_unlock(&all_mddevs_lock
);
4901 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4905 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4909 struct mdstat_info
{
4913 static int md_seq_show(struct seq_file
*seq
, void *v
)
4917 struct list_head
*tmp2
;
4919 struct mdstat_info
*mi
= seq
->private;
4920 struct bitmap
*bitmap
;
4922 if (v
== (void*)1) {
4923 struct mdk_personality
*pers
;
4924 seq_printf(seq
, "Personalities : ");
4925 spin_lock(&pers_lock
);
4926 list_for_each_entry(pers
, &pers_list
, list
)
4927 seq_printf(seq
, "[%s] ", pers
->name
);
4929 spin_unlock(&pers_lock
);
4930 seq_printf(seq
, "\n");
4931 mi
->event
= atomic_read(&md_event_count
);
4934 if (v
== (void*)2) {
4939 if (mddev_lock(mddev
) < 0)
4942 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4943 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4944 mddev
->pers
? "" : "in");
4947 seq_printf(seq
, " (read-only)");
4949 seq_printf(seq
, "(auto-read-only)");
4950 seq_printf(seq
, " %s", mddev
->pers
->name
);
4954 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4955 char b
[BDEVNAME_SIZE
];
4956 seq_printf(seq
, " %s[%d]",
4957 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4958 if (test_bit(WriteMostly
, &rdev
->flags
))
4959 seq_printf(seq
, "(W)");
4960 if (test_bit(Faulty
, &rdev
->flags
)) {
4961 seq_printf(seq
, "(F)");
4963 } else if (rdev
->raid_disk
< 0)
4964 seq_printf(seq
, "(S)"); /* spare */
4968 if (!list_empty(&mddev
->disks
)) {
4970 seq_printf(seq
, "\n %llu blocks",
4971 (unsigned long long)mddev
->array_size
);
4973 seq_printf(seq
, "\n %llu blocks",
4974 (unsigned long long)size
);
4976 if (mddev
->persistent
) {
4977 if (mddev
->major_version
!= 0 ||
4978 mddev
->minor_version
!= 90) {
4979 seq_printf(seq
," super %d.%d",
4980 mddev
->major_version
,
4981 mddev
->minor_version
);
4984 seq_printf(seq
, " super non-persistent");
4987 mddev
->pers
->status (seq
, mddev
);
4988 seq_printf(seq
, "\n ");
4989 if (mddev
->pers
->sync_request
) {
4990 if (mddev
->curr_resync
> 2) {
4991 status_resync (seq
, mddev
);
4992 seq_printf(seq
, "\n ");
4993 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4994 seq_printf(seq
, "\tresync=DELAYED\n ");
4995 else if (mddev
->recovery_cp
< MaxSector
)
4996 seq_printf(seq
, "\tresync=PENDING\n ");
4999 seq_printf(seq
, "\n ");
5001 if ((bitmap
= mddev
->bitmap
)) {
5002 unsigned long chunk_kb
;
5003 unsigned long flags
;
5004 spin_lock_irqsave(&bitmap
->lock
, flags
);
5005 chunk_kb
= bitmap
->chunksize
>> 10;
5006 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5008 bitmap
->pages
- bitmap
->missing_pages
,
5010 (bitmap
->pages
- bitmap
->missing_pages
)
5011 << (PAGE_SHIFT
- 10),
5012 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5013 chunk_kb
? "KB" : "B");
5015 seq_printf(seq
, ", file: ");
5016 seq_path(seq
, bitmap
->file
->f_path
.mnt
,
5017 bitmap
->file
->f_path
.dentry
," \t\n");
5020 seq_printf(seq
, "\n");
5021 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5024 seq_printf(seq
, "\n");
5026 mddev_unlock(mddev
);
5031 static struct seq_operations md_seq_ops
= {
5032 .start
= md_seq_start
,
5033 .next
= md_seq_next
,
5034 .stop
= md_seq_stop
,
5035 .show
= md_seq_show
,
5038 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5041 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5045 error
= seq_open(file
, &md_seq_ops
);
5049 struct seq_file
*p
= file
->private_data
;
5051 mi
->event
= atomic_read(&md_event_count
);
5056 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5058 struct seq_file
*m
= filp
->private_data
;
5059 struct mdstat_info
*mi
= m
->private;
5062 poll_wait(filp
, &md_event_waiters
, wait
);
5064 /* always allow read */
5065 mask
= POLLIN
| POLLRDNORM
;
5067 if (mi
->event
!= atomic_read(&md_event_count
))
5068 mask
|= POLLERR
| POLLPRI
;
5072 static const struct file_operations md_seq_fops
= {
5073 .owner
= THIS_MODULE
,
5074 .open
= md_seq_open
,
5076 .llseek
= seq_lseek
,
5077 .release
= seq_release_private
,
5078 .poll
= mdstat_poll
,
5081 int register_md_personality(struct mdk_personality
*p
)
5083 spin_lock(&pers_lock
);
5084 list_add_tail(&p
->list
, &pers_list
);
5085 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5086 spin_unlock(&pers_lock
);
5090 int unregister_md_personality(struct mdk_personality
*p
)
5092 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5093 spin_lock(&pers_lock
);
5094 list_del_init(&p
->list
);
5095 spin_unlock(&pers_lock
);
5099 static int is_mddev_idle(mddev_t
*mddev
)
5102 struct list_head
*tmp
;
5107 ITERATE_RDEV(mddev
,rdev
,tmp
) {
5108 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5109 curr_events
= disk_stat_read(disk
, sectors
[0]) +
5110 disk_stat_read(disk
, sectors
[1]) -
5111 atomic_read(&disk
->sync_io
);
5112 /* sync IO will cause sync_io to increase before the disk_stats
5113 * as sync_io is counted when a request starts, and
5114 * disk_stats is counted when it completes.
5115 * So resync activity will cause curr_events to be smaller than
5116 * when there was no such activity.
5117 * non-sync IO will cause disk_stat to increase without
5118 * increasing sync_io so curr_events will (eventually)
5119 * be larger than it was before. Once it becomes
5120 * substantially larger, the test below will cause
5121 * the array to appear non-idle, and resync will slow
5123 * If there is a lot of outstanding resync activity when
5124 * we set last_event to curr_events, then all that activity
5125 * completing might cause the array to appear non-idle
5126 * and resync will be slowed down even though there might
5127 * not have been non-resync activity. This will only
5128 * happen once though. 'last_events' will soon reflect
5129 * the state where there is little or no outstanding
5130 * resync requests, and further resync activity will
5131 * always make curr_events less than last_events.
5134 if (curr_events
- rdev
->last_events
> 4096) {
5135 rdev
->last_events
= curr_events
;
5142 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5144 /* another "blocks" (512byte) blocks have been synced */
5145 atomic_sub(blocks
, &mddev
->recovery_active
);
5146 wake_up(&mddev
->recovery_wait
);
5148 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5149 md_wakeup_thread(mddev
->thread
);
5150 // stop recovery, signal do_sync ....
5155 /* md_write_start(mddev, bi)
5156 * If we need to update some array metadata (e.g. 'active' flag
5157 * in superblock) before writing, schedule a superblock update
5158 * and wait for it to complete.
5160 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5162 if (bio_data_dir(bi
) != WRITE
)
5165 BUG_ON(mddev
->ro
== 1);
5166 if (mddev
->ro
== 2) {
5167 /* need to switch to read/write */
5169 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5170 md_wakeup_thread(mddev
->thread
);
5172 atomic_inc(&mddev
->writes_pending
);
5173 if (mddev
->in_sync
) {
5174 spin_lock_irq(&mddev
->write_lock
);
5175 if (mddev
->in_sync
) {
5177 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5178 md_wakeup_thread(mddev
->thread
);
5180 spin_unlock_irq(&mddev
->write_lock
);
5182 wait_event(mddev
->sb_wait
, mddev
->flags
==0);
5185 void md_write_end(mddev_t
*mddev
)
5187 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5188 if (mddev
->safemode
== 2)
5189 md_wakeup_thread(mddev
->thread
);
5190 else if (mddev
->safemode_delay
)
5191 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5195 /* md_allow_write(mddev)
5196 * Calling this ensures that the array is marked 'active' so that writes
5197 * may proceed without blocking. It is important to call this before
5198 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5199 * Must be called with mddev_lock held.
5201 void md_allow_write(mddev_t
*mddev
)
5208 spin_lock_irq(&mddev
->write_lock
);
5209 if (mddev
->in_sync
) {
5211 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5212 if (mddev
->safemode_delay
&&
5213 mddev
->safemode
== 0)
5214 mddev
->safemode
= 1;
5215 spin_unlock_irq(&mddev
->write_lock
);
5216 md_update_sb(mddev
, 0);
5218 spin_unlock_irq(&mddev
->write_lock
);
5220 EXPORT_SYMBOL_GPL(md_allow_write
);
5222 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
5224 #define SYNC_MARKS 10
5225 #define SYNC_MARK_STEP (3*HZ)
5226 void md_do_sync(mddev_t
*mddev
)
5229 unsigned int currspeed
= 0,
5231 sector_t max_sectors
,j
, io_sectors
;
5232 unsigned long mark
[SYNC_MARKS
];
5233 sector_t mark_cnt
[SYNC_MARKS
];
5235 struct list_head
*tmp
;
5236 sector_t last_check
;
5238 struct list_head
*rtmp
;
5242 /* just incase thread restarts... */
5243 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5245 if (mddev
->ro
) /* never try to sync a read-only array */
5248 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5249 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5250 desc
= "data-check";
5251 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5252 desc
= "requested-resync";
5255 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5260 /* we overload curr_resync somewhat here.
5261 * 0 == not engaged in resync at all
5262 * 2 == checking that there is no conflict with another sync
5263 * 1 == like 2, but have yielded to allow conflicting resync to
5265 * other == active in resync - this many blocks
5267 * Before starting a resync we must have set curr_resync to
5268 * 2, and then checked that every "conflicting" array has curr_resync
5269 * less than ours. When we find one that is the same or higher
5270 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5271 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5272 * This will mean we have to start checking from the beginning again.
5277 mddev
->curr_resync
= 2;
5280 if (kthread_should_stop()) {
5281 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5284 ITERATE_MDDEV(mddev2
,tmp
) {
5285 if (mddev2
== mddev
)
5287 if (mddev2
->curr_resync
&&
5288 match_mddev_units(mddev
,mddev2
)) {
5290 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5291 /* arbitrarily yield */
5292 mddev
->curr_resync
= 1;
5293 wake_up(&resync_wait
);
5295 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5296 /* no need to wait here, we can wait the next
5297 * time 'round when curr_resync == 2
5300 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5301 if (!kthread_should_stop() &&
5302 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5303 printk(KERN_INFO
"md: delaying %s of %s"
5304 " until %s has finished (they"
5305 " share one or more physical units)\n",
5306 desc
, mdname(mddev
), mdname(mddev2
));
5309 finish_wait(&resync_wait
, &wq
);
5312 finish_wait(&resync_wait
, &wq
);
5315 } while (mddev
->curr_resync
< 2);
5318 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5319 /* resync follows the size requested by the personality,
5320 * which defaults to physical size, but can be virtual size
5322 max_sectors
= mddev
->resync_max_sectors
;
5323 mddev
->resync_mismatches
= 0;
5324 /* we don't use the checkpoint if there's a bitmap */
5325 if (!mddev
->bitmap
&&
5326 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5327 j
= mddev
->recovery_cp
;
5328 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5329 max_sectors
= mddev
->size
<< 1;
5331 /* recovery follows the physical size of devices */
5332 max_sectors
= mddev
->size
<< 1;
5334 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5335 if (rdev
->raid_disk
>= 0 &&
5336 !test_bit(Faulty
, &rdev
->flags
) &&
5337 !test_bit(In_sync
, &rdev
->flags
) &&
5338 rdev
->recovery_offset
< j
)
5339 j
= rdev
->recovery_offset
;
5342 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5343 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5344 " %d KB/sec/disk.\n", speed_min(mddev
));
5345 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5346 "(but not more than %d KB/sec) for %s.\n",
5347 speed_max(mddev
), desc
);
5349 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5352 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5354 mark_cnt
[m
] = io_sectors
;
5357 mddev
->resync_mark
= mark
[last_mark
];
5358 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5361 * Tune reconstruction:
5363 window
= 32*(PAGE_SIZE
/512);
5364 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5365 window
/2,(unsigned long long) max_sectors
/2);
5367 atomic_set(&mddev
->recovery_active
, 0);
5368 init_waitqueue_head(&mddev
->recovery_wait
);
5373 "md: resuming %s of %s from checkpoint.\n",
5374 desc
, mdname(mddev
));
5375 mddev
->curr_resync
= j
;
5378 while (j
< max_sectors
) {
5382 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5383 currspeed
< speed_min(mddev
));
5385 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5389 if (!skipped
) { /* actual IO requested */
5390 io_sectors
+= sectors
;
5391 atomic_add(sectors
, &mddev
->recovery_active
);
5395 if (j
>1) mddev
->curr_resync
= j
;
5396 mddev
->curr_mark_cnt
= io_sectors
;
5397 if (last_check
== 0)
5398 /* this is the earliers that rebuilt will be
5399 * visible in /proc/mdstat
5401 md_new_event(mddev
);
5403 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5406 last_check
= io_sectors
;
5408 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
5409 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
5413 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5415 int next
= (last_mark
+1) % SYNC_MARKS
;
5417 mddev
->resync_mark
= mark
[next
];
5418 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5419 mark
[next
] = jiffies
;
5420 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5425 if (kthread_should_stop()) {
5427 * got a signal, exit.
5430 "md: md_do_sync() got signal ... exiting\n");
5431 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5436 * this loop exits only if either when we are slower than
5437 * the 'hard' speed limit, or the system was IO-idle for
5439 * the system might be non-idle CPU-wise, but we only care
5440 * about not overloading the IO subsystem. (things like an
5441 * e2fsck being done on the RAID array should execute fast)
5443 mddev
->queue
->unplug_fn(mddev
->queue
);
5446 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5447 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5449 if (currspeed
> speed_min(mddev
)) {
5450 if ((currspeed
> speed_max(mddev
)) ||
5451 !is_mddev_idle(mddev
)) {
5457 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5459 * this also signals 'finished resyncing' to md_stop
5462 mddev
->queue
->unplug_fn(mddev
->queue
);
5464 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5466 /* tell personality that we are finished */
5467 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5469 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5470 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5471 mddev
->curr_resync
> 2) {
5472 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5473 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5474 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5476 "md: checkpointing %s of %s.\n",
5477 desc
, mdname(mddev
));
5478 mddev
->recovery_cp
= mddev
->curr_resync
;
5481 mddev
->recovery_cp
= MaxSector
;
5483 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5484 mddev
->curr_resync
= MaxSector
;
5485 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5486 if (rdev
->raid_disk
>= 0 &&
5487 !test_bit(Faulty
, &rdev
->flags
) &&
5488 !test_bit(In_sync
, &rdev
->flags
) &&
5489 rdev
->recovery_offset
< mddev
->curr_resync
)
5490 rdev
->recovery_offset
= mddev
->curr_resync
;
5493 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5496 mddev
->curr_resync
= 0;
5497 wake_up(&resync_wait
);
5498 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5499 md_wakeup_thread(mddev
->thread
);
5501 EXPORT_SYMBOL_GPL(md_do_sync
);
5504 static int remove_and_add_spares(mddev_t
*mddev
)
5507 struct list_head
*rtmp
;
5510 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5511 if (rdev
->raid_disk
>= 0 &&
5512 (test_bit(Faulty
, &rdev
->flags
) ||
5513 ! test_bit(In_sync
, &rdev
->flags
)) &&
5514 atomic_read(&rdev
->nr_pending
)==0) {
5515 if (mddev
->pers
->hot_remove_disk(
5516 mddev
, rdev
->raid_disk
)==0) {
5518 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5519 sysfs_remove_link(&mddev
->kobj
, nm
);
5520 rdev
->raid_disk
= -1;
5524 if (mddev
->degraded
) {
5525 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5526 if (rdev
->raid_disk
< 0
5527 && !test_bit(Faulty
, &rdev
->flags
)) {
5528 rdev
->recovery_offset
= 0;
5529 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
5531 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5532 if (sysfs_create_link(&mddev
->kobj
,
5535 "md: cannot register "
5539 md_new_event(mddev
);
5547 * This routine is regularly called by all per-raid-array threads to
5548 * deal with generic issues like resync and super-block update.
5549 * Raid personalities that don't have a thread (linear/raid0) do not
5550 * need this as they never do any recovery or update the superblock.
5552 * It does not do any resync itself, but rather "forks" off other threads
5553 * to do that as needed.
5554 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5555 * "->recovery" and create a thread at ->sync_thread.
5556 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5557 * and wakeups up this thread which will reap the thread and finish up.
5558 * This thread also removes any faulty devices (with nr_pending == 0).
5560 * The overall approach is:
5561 * 1/ if the superblock needs updating, update it.
5562 * 2/ If a recovery thread is running, don't do anything else.
5563 * 3/ If recovery has finished, clean up, possibly marking spares active.
5564 * 4/ If there are any faulty devices, remove them.
5565 * 5/ If array is degraded, try to add spares devices
5566 * 6/ If array has spares or is not in-sync, start a resync thread.
5568 void md_check_recovery(mddev_t
*mddev
)
5571 struct list_head
*rtmp
;
5575 bitmap_daemon_work(mddev
->bitmap
);
5580 if (signal_pending(current
)) {
5581 if (mddev
->pers
->sync_request
) {
5582 printk(KERN_INFO
"md: %s in immediate safe mode\n",
5584 mddev
->safemode
= 2;
5586 flush_signals(current
);
5591 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
5592 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
5593 (mddev
->safemode
== 1) ||
5594 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
5595 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
5599 if (mddev_trylock(mddev
)) {
5602 spin_lock_irq(&mddev
->write_lock
);
5603 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
5604 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
5606 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5608 if (mddev
->safemode
== 1)
5609 mddev
->safemode
= 0;
5610 spin_unlock_irq(&mddev
->write_lock
);
5613 md_update_sb(mddev
, 0);
5616 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
5617 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
5618 /* resync/recovery still happening */
5619 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5622 if (mddev
->sync_thread
) {
5623 /* resync has finished, collect result */
5624 md_unregister_thread(mddev
->sync_thread
);
5625 mddev
->sync_thread
= NULL
;
5626 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5627 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5629 /* activate any spares */
5630 mddev
->pers
->spare_active(mddev
);
5632 md_update_sb(mddev
, 1);
5634 /* if array is no-longer degraded, then any saved_raid_disk
5635 * information must be scrapped
5637 if (!mddev
->degraded
)
5638 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5639 rdev
->saved_raid_disk
= -1;
5641 mddev
->recovery
= 0;
5642 /* flag recovery needed just to double check */
5643 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5644 md_new_event(mddev
);
5647 /* Clear some bits that don't mean anything, but
5650 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5651 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5652 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5653 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5655 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
5657 /* no recovery is running.
5658 * remove any failed drives, then
5659 * add spares if possible.
5660 * Spare are also removed and re-added, to allow
5661 * the personality to fail the re-add.
5664 if (mddev
->reshape_position
!= MaxSector
) {
5665 if (mddev
->pers
->check_reshape(mddev
) != 0)
5666 /* Cannot proceed */
5668 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
5669 } else if ((spares
= remove_and_add_spares(mddev
))) {
5670 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5671 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
5672 } else if (mddev
->recovery_cp
< MaxSector
) {
5673 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5674 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5675 /* nothing to be done ... */
5678 if (mddev
->pers
->sync_request
) {
5679 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
5680 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
5681 /* We are adding a device or devices to an array
5682 * which has the bitmap stored on all devices.
5683 * So make sure all bitmap pages get written
5685 bitmap_write_all(mddev
->bitmap
);
5687 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5690 if (!mddev
->sync_thread
) {
5691 printk(KERN_ERR
"%s: could not start resync"
5694 /* leave the spares where they are, it shouldn't hurt */
5695 mddev
->recovery
= 0;
5697 md_wakeup_thread(mddev
->sync_thread
);
5698 md_new_event(mddev
);
5701 mddev_unlock(mddev
);
5705 static int md_notify_reboot(struct notifier_block
*this,
5706 unsigned long code
, void *x
)
5708 struct list_head
*tmp
;
5711 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5713 printk(KERN_INFO
"md: stopping all md devices.\n");
5715 ITERATE_MDDEV(mddev
,tmp
)
5716 if (mddev_trylock(mddev
)) {
5717 do_md_stop (mddev
, 1);
5718 mddev_unlock(mddev
);
5721 * certain more exotic SCSI devices are known to be
5722 * volatile wrt too early system reboots. While the
5723 * right place to handle this issue is the given
5724 * driver, we do want to have a safe RAID driver ...
5731 static struct notifier_block md_notifier
= {
5732 .notifier_call
= md_notify_reboot
,
5734 .priority
= INT_MAX
, /* before any real devices */
5737 static void md_geninit(void)
5739 struct proc_dir_entry
*p
;
5741 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5743 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
5745 p
->proc_fops
= &md_seq_fops
;
5748 static int __init
md_init(void)
5750 if (register_blkdev(MAJOR_NR
, "md"))
5752 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5753 unregister_blkdev(MAJOR_NR
, "md");
5756 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5757 md_probe
, NULL
, NULL
);
5758 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5759 md_probe
, NULL
, NULL
);
5761 register_reboot_notifier(&md_notifier
);
5762 raid_table_header
= register_sysctl_table(raid_root_table
);
5772 * Searches all registered partitions for autorun RAID arrays
5775 static dev_t detected_devices
[128];
5778 void md_autodetect_dev(dev_t dev
)
5780 if (dev_cnt
>= 0 && dev_cnt
< 127)
5781 detected_devices
[dev_cnt
++] = dev
;
5785 static void autostart_arrays(int part
)
5790 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
5792 for (i
= 0; i
< dev_cnt
; i
++) {
5793 dev_t dev
= detected_devices
[i
];
5795 rdev
= md_import_device(dev
,0, 90);
5799 if (test_bit(Faulty
, &rdev
->flags
)) {
5803 list_add(&rdev
->same_set
, &pending_raid_disks
);
5807 autorun_devices(part
);
5810 #endif /* !MODULE */
5812 static __exit
void md_exit(void)
5815 struct list_head
*tmp
;
5817 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
5818 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
5820 unregister_blkdev(MAJOR_NR
,"md");
5821 unregister_blkdev(mdp_major
, "mdp");
5822 unregister_reboot_notifier(&md_notifier
);
5823 unregister_sysctl_table(raid_table_header
);
5824 remove_proc_entry("mdstat", NULL
);
5825 ITERATE_MDDEV(mddev
,tmp
) {
5826 struct gendisk
*disk
= mddev
->gendisk
;
5829 export_array(mddev
);
5832 mddev
->gendisk
= NULL
;
5837 subsys_initcall(md_init
);
5838 module_exit(md_exit
)
5840 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5842 return sprintf(buffer
, "%d", start_readonly
);
5844 static int set_ro(const char *val
, struct kernel_param
*kp
)
5847 int num
= simple_strtoul(val
, &e
, 10);
5848 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5849 start_readonly
= num
;
5855 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
5856 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
5859 EXPORT_SYMBOL(register_md_personality
);
5860 EXPORT_SYMBOL(unregister_md_personality
);
5861 EXPORT_SYMBOL(md_error
);
5862 EXPORT_SYMBOL(md_done_sync
);
5863 EXPORT_SYMBOL(md_write_start
);
5864 EXPORT_SYMBOL(md_write_end
);
5865 EXPORT_SYMBOL(md_register_thread
);
5866 EXPORT_SYMBOL(md_unregister_thread
);
5867 EXPORT_SYMBOL(md_wakeup_thread
);
5868 EXPORT_SYMBOL(md_check_recovery
);
5869 MODULE_LICENSE("GPL");
5871 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);