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 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
79 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min
= 1000;
95 static int sysctl_speed_limit_max
= 200000;
96 static inline int speed_min(mddev_t
*mddev
)
98 return mddev
->sync_speed_min
?
99 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
102 static inline int speed_max(mddev_t
*mddev
)
104 return mddev
->sync_speed_max
?
105 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
108 static struct ctl_table_header
*raid_table_header
;
110 static ctl_table raid_table
[] = {
112 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
113 .procname
= "speed_limit_min",
114 .data
= &sysctl_speed_limit_min
,
115 .maxlen
= sizeof(int),
116 .mode
= S_IRUGO
|S_IWUSR
,
117 .proc_handler
= &proc_dointvec
,
120 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
121 .procname
= "speed_limit_max",
122 .data
= &sysctl_speed_limit_max
,
123 .maxlen
= sizeof(int),
124 .mode
= S_IRUGO
|S_IWUSR
,
125 .proc_handler
= &proc_dointvec
,
130 static ctl_table raid_dir_table
[] = {
132 .ctl_name
= DEV_RAID
,
135 .mode
= S_IRUGO
|S_IXUGO
,
141 static ctl_table raid_root_table
[] = {
147 .child
= raid_dir_table
,
152 static struct block_device_operations md_fops
;
154 static int start_readonly
;
157 * We have a system wide 'event count' that is incremented
158 * on any 'interesting' event, and readers of /proc/mdstat
159 * can use 'poll' or 'select' to find out when the event
163 * start array, stop array, error, add device, remove device,
164 * start build, activate spare
166 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
167 static atomic_t md_event_count
;
168 void md_new_event(mddev_t
*mddev
)
170 atomic_inc(&md_event_count
);
171 wake_up(&md_event_waiters
);
172 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
174 EXPORT_SYMBOL_GPL(md_new_event
);
176 /* Alternate version that can be called from interrupts
177 * when calling sysfs_notify isn't needed.
179 static void md_new_event_inintr(mddev_t
*mddev
)
181 atomic_inc(&md_event_count
);
182 wake_up(&md_event_waiters
);
186 * Enables to iterate over all existing md arrays
187 * all_mddevs_lock protects this list.
189 static LIST_HEAD(all_mddevs
);
190 static DEFINE_SPINLOCK(all_mddevs_lock
);
194 * iterates through all used mddevs in the system.
195 * We take care to grab the all_mddevs_lock whenever navigating
196 * the list, and to always hold a refcount when unlocked.
197 * Any code which breaks out of this loop while own
198 * a reference to the current mddev and must mddev_put it.
200 #define for_each_mddev(mddev,tmp) \
202 for (({ spin_lock(&all_mddevs_lock); \
203 tmp = all_mddevs.next; \
205 ({ if (tmp != &all_mddevs) \
206 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
207 spin_unlock(&all_mddevs_lock); \
208 if (mddev) mddev_put(mddev); \
209 mddev = list_entry(tmp, mddev_t, all_mddevs); \
210 tmp != &all_mddevs;}); \
211 ({ spin_lock(&all_mddevs_lock); \
216 static int md_fail_request (struct request_queue
*q
, struct bio
*bio
)
222 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
224 atomic_inc(&mddev
->active
);
228 static void mddev_put(mddev_t
*mddev
)
230 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
232 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
233 list_del(&mddev
->all_mddevs
);
234 spin_unlock(&all_mddevs_lock
);
235 blk_cleanup_queue(mddev
->queue
);
236 kobject_put(&mddev
->kobj
);
238 spin_unlock(&all_mddevs_lock
);
241 static mddev_t
* mddev_find(dev_t unit
)
243 mddev_t
*mddev
, *new = NULL
;
246 spin_lock(&all_mddevs_lock
);
247 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
248 if (mddev
->unit
== unit
) {
250 spin_unlock(&all_mddevs_lock
);
256 list_add(&new->all_mddevs
, &all_mddevs
);
257 spin_unlock(&all_mddevs_lock
);
260 spin_unlock(&all_mddevs_lock
);
262 new = kzalloc(sizeof(*new), GFP_KERNEL
);
267 if (MAJOR(unit
) == MD_MAJOR
)
268 new->md_minor
= MINOR(unit
);
270 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
272 mutex_init(&new->reconfig_mutex
);
273 INIT_LIST_HEAD(&new->disks
);
274 INIT_LIST_HEAD(&new->all_mddevs
);
275 init_timer(&new->safemode_timer
);
276 atomic_set(&new->active
, 1);
277 spin_lock_init(&new->write_lock
);
278 init_waitqueue_head(&new->sb_wait
);
279 new->reshape_position
= MaxSector
;
280 new->resync_max
= MaxSector
;
281 new->level
= LEVEL_NONE
;
283 new->queue
= blk_alloc_queue(GFP_KERNEL
);
288 /* Can be unlocked because the queue is new: no concurrency */
289 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, new->queue
);
291 blk_queue_make_request(new->queue
, md_fail_request
);
296 static inline int mddev_lock(mddev_t
* mddev
)
298 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
301 static inline int mddev_trylock(mddev_t
* mddev
)
303 return mutex_trylock(&mddev
->reconfig_mutex
);
306 static inline void mddev_unlock(mddev_t
* mddev
)
308 mutex_unlock(&mddev
->reconfig_mutex
);
310 md_wakeup_thread(mddev
->thread
);
313 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
316 struct list_head
*tmp
;
318 rdev_for_each(rdev
, tmp
, mddev
) {
319 if (rdev
->desc_nr
== nr
)
325 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
327 struct list_head
*tmp
;
330 rdev_for_each(rdev
, tmp
, mddev
) {
331 if (rdev
->bdev
->bd_dev
== dev
)
337 static struct mdk_personality
*find_pers(int level
, char *clevel
)
339 struct mdk_personality
*pers
;
340 list_for_each_entry(pers
, &pers_list
, list
) {
341 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
343 if (strcmp(pers
->name
, clevel
)==0)
349 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
351 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
352 return MD_NEW_SIZE_BLOCKS(size
);
355 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
359 size
= rdev
->sb_offset
;
362 size
&= ~((sector_t
)chunk_size
/1024 - 1);
366 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
371 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
372 if (!rdev
->sb_page
) {
373 printk(KERN_ALERT
"md: out of memory.\n");
380 static void free_disk_sb(mdk_rdev_t
* rdev
)
383 put_page(rdev
->sb_page
);
385 rdev
->sb_page
= NULL
;
392 static void super_written(struct bio
*bio
, int error
)
394 mdk_rdev_t
*rdev
= bio
->bi_private
;
395 mddev_t
*mddev
= rdev
->mddev
;
397 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
398 printk("md: super_written gets error=%d, uptodate=%d\n",
399 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
400 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
401 md_error(mddev
, rdev
);
404 if (atomic_dec_and_test(&mddev
->pending_writes
))
405 wake_up(&mddev
->sb_wait
);
409 static void super_written_barrier(struct bio
*bio
, int error
)
411 struct bio
*bio2
= bio
->bi_private
;
412 mdk_rdev_t
*rdev
= bio2
->bi_private
;
413 mddev_t
*mddev
= rdev
->mddev
;
415 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
416 error
== -EOPNOTSUPP
) {
418 /* barriers don't appear to be supported :-( */
419 set_bit(BarriersNotsupp
, &rdev
->flags
);
420 mddev
->barriers_work
= 0;
421 spin_lock_irqsave(&mddev
->write_lock
, flags
);
422 bio2
->bi_next
= mddev
->biolist
;
423 mddev
->biolist
= bio2
;
424 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
425 wake_up(&mddev
->sb_wait
);
429 bio
->bi_private
= rdev
;
430 super_written(bio
, error
);
434 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
435 sector_t sector
, int size
, struct page
*page
)
437 /* write first size bytes of page to sector of rdev
438 * Increment mddev->pending_writes before returning
439 * and decrement it on completion, waking up sb_wait
440 * if zero is reached.
441 * If an error occurred, call md_error
443 * As we might need to resubmit the request if BIO_RW_BARRIER
444 * causes ENOTSUPP, we allocate a spare bio...
446 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
447 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
449 bio
->bi_bdev
= rdev
->bdev
;
450 bio
->bi_sector
= sector
;
451 bio_add_page(bio
, page
, size
, 0);
452 bio
->bi_private
= rdev
;
453 bio
->bi_end_io
= super_written
;
456 atomic_inc(&mddev
->pending_writes
);
457 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
459 rw
|= (1<<BIO_RW_BARRIER
);
460 rbio
= bio_clone(bio
, GFP_NOIO
);
461 rbio
->bi_private
= bio
;
462 rbio
->bi_end_io
= super_written_barrier
;
463 submit_bio(rw
, rbio
);
468 void md_super_wait(mddev_t
*mddev
)
470 /* wait for all superblock writes that were scheduled to complete.
471 * if any had to be retried (due to BARRIER problems), retry them
475 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
476 if (atomic_read(&mddev
->pending_writes
)==0)
478 while (mddev
->biolist
) {
480 spin_lock_irq(&mddev
->write_lock
);
481 bio
= mddev
->biolist
;
482 mddev
->biolist
= bio
->bi_next
;
484 spin_unlock_irq(&mddev
->write_lock
);
485 submit_bio(bio
->bi_rw
, bio
);
489 finish_wait(&mddev
->sb_wait
, &wq
);
492 static void bi_complete(struct bio
*bio
, int error
)
494 complete((struct completion
*)bio
->bi_private
);
497 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
498 struct page
*page
, int rw
)
500 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
501 struct completion event
;
504 rw
|= (1 << BIO_RW_SYNC
);
507 bio
->bi_sector
= sector
;
508 bio_add_page(bio
, page
, size
, 0);
509 init_completion(&event
);
510 bio
->bi_private
= &event
;
511 bio
->bi_end_io
= bi_complete
;
513 wait_for_completion(&event
);
515 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
519 EXPORT_SYMBOL_GPL(sync_page_io
);
521 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
523 char b
[BDEVNAME_SIZE
];
524 if (!rdev
->sb_page
) {
532 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
538 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev
->bdev
,b
));
543 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
545 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
546 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
547 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
548 (sb1
->set_uuid3
== sb2
->set_uuid3
))
556 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
559 mdp_super_t
*tmp1
, *tmp2
;
561 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
562 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
564 if (!tmp1
|| !tmp2
) {
566 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
574 * nr_disks is not constant
579 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
591 static u32
md_csum_fold(u32 csum
)
593 csum
= (csum
& 0xffff) + (csum
>> 16);
594 return (csum
& 0xffff) + (csum
>> 16);
597 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
600 u32
*sb32
= (u32
*)sb
;
602 unsigned int disk_csum
, csum
;
604 disk_csum
= sb
->sb_csum
;
607 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
609 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
613 /* This used to use csum_partial, which was wrong for several
614 * reasons including that different results are returned on
615 * different architectures. It isn't critical that we get exactly
616 * the same return value as before (we always csum_fold before
617 * testing, and that removes any differences). However as we
618 * know that csum_partial always returned a 16bit value on
619 * alphas, do a fold to maximise conformity to previous behaviour.
621 sb
->sb_csum
= md_csum_fold(disk_csum
);
623 sb
->sb_csum
= disk_csum
;
630 * Handle superblock details.
631 * We want to be able to handle multiple superblock formats
632 * so we have a common interface to them all, and an array of
633 * different handlers.
634 * We rely on user-space to write the initial superblock, and support
635 * reading and updating of superblocks.
636 * Interface methods are:
637 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
638 * loads and validates a superblock on dev.
639 * if refdev != NULL, compare superblocks on both devices
641 * 0 - dev has a superblock that is compatible with refdev
642 * 1 - dev has a superblock that is compatible and newer than refdev
643 * so dev should be used as the refdev in future
644 * -EINVAL superblock incompatible or invalid
645 * -othererror e.g. -EIO
647 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
648 * Verify that dev is acceptable into mddev.
649 * The first time, mddev->raid_disks will be 0, and data from
650 * dev should be merged in. Subsequent calls check that dev
651 * is new enough. Return 0 or -EINVAL
653 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
654 * Update the superblock for rdev with data in mddev
655 * This does not write to disc.
661 struct module
*owner
;
662 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
663 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
664 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
668 * load_super for 0.90.0
670 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
672 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
678 * Calculate the position of the superblock,
679 * it's at the end of the disk.
681 * It also happens to be a multiple of 4Kb.
683 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
684 rdev
->sb_offset
= sb_offset
;
686 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
691 bdevname(rdev
->bdev
, b
);
692 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
694 if (sb
->md_magic
!= MD_SB_MAGIC
) {
695 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
700 if (sb
->major_version
!= 0 ||
701 sb
->minor_version
< 90 ||
702 sb
->minor_version
> 91) {
703 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
704 sb
->major_version
, sb
->minor_version
,
709 if (sb
->raid_disks
<= 0)
712 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
713 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
718 rdev
->preferred_minor
= sb
->md_minor
;
719 rdev
->data_offset
= 0;
720 rdev
->sb_size
= MD_SB_BYTES
;
722 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
723 if (sb
->level
!= 1 && sb
->level
!= 4
724 && sb
->level
!= 5 && sb
->level
!= 6
725 && sb
->level
!= 10) {
726 /* FIXME use a better test */
728 "md: bitmaps not supported for this level.\n");
733 if (sb
->level
== LEVEL_MULTIPATH
)
736 rdev
->desc_nr
= sb
->this_disk
.number
;
742 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
743 if (!uuid_equal(refsb
, sb
)) {
744 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
745 b
, bdevname(refdev
->bdev
,b2
));
748 if (!sb_equal(refsb
, sb
)) {
749 printk(KERN_WARNING
"md: %s has same UUID"
750 " but different superblock to %s\n",
751 b
, bdevname(refdev
->bdev
, b2
));
755 ev2
= md_event(refsb
);
761 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
763 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
764 /* "this cannot possibly happen" ... */
772 * validate_super for 0.90.0
774 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
777 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
778 __u64 ev1
= md_event(sb
);
780 rdev
->raid_disk
= -1;
781 clear_bit(Faulty
, &rdev
->flags
);
782 clear_bit(In_sync
, &rdev
->flags
);
783 clear_bit(WriteMostly
, &rdev
->flags
);
784 clear_bit(BarriersNotsupp
, &rdev
->flags
);
786 if (mddev
->raid_disks
== 0) {
787 mddev
->major_version
= 0;
788 mddev
->minor_version
= sb
->minor_version
;
789 mddev
->patch_version
= sb
->patch_version
;
791 mddev
->chunk_size
= sb
->chunk_size
;
792 mddev
->ctime
= sb
->ctime
;
793 mddev
->utime
= sb
->utime
;
794 mddev
->level
= sb
->level
;
795 mddev
->clevel
[0] = 0;
796 mddev
->layout
= sb
->layout
;
797 mddev
->raid_disks
= sb
->raid_disks
;
798 mddev
->size
= sb
->size
;
800 mddev
->bitmap_offset
= 0;
801 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
803 if (mddev
->minor_version
>= 91) {
804 mddev
->reshape_position
= sb
->reshape_position
;
805 mddev
->delta_disks
= sb
->delta_disks
;
806 mddev
->new_level
= sb
->new_level
;
807 mddev
->new_layout
= sb
->new_layout
;
808 mddev
->new_chunk
= sb
->new_chunk
;
810 mddev
->reshape_position
= MaxSector
;
811 mddev
->delta_disks
= 0;
812 mddev
->new_level
= mddev
->level
;
813 mddev
->new_layout
= mddev
->layout
;
814 mddev
->new_chunk
= mddev
->chunk_size
;
817 if (sb
->state
& (1<<MD_SB_CLEAN
))
818 mddev
->recovery_cp
= MaxSector
;
820 if (sb
->events_hi
== sb
->cp_events_hi
&&
821 sb
->events_lo
== sb
->cp_events_lo
) {
822 mddev
->recovery_cp
= sb
->recovery_cp
;
824 mddev
->recovery_cp
= 0;
827 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
828 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
829 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
830 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
832 mddev
->max_disks
= MD_SB_DISKS
;
834 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
835 mddev
->bitmap_file
== NULL
)
836 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
838 } else if (mddev
->pers
== NULL
) {
839 /* Insist on good event counter while assembling */
841 if (ev1
< mddev
->events
)
843 } else if (mddev
->bitmap
) {
844 /* if adding to array with a bitmap, then we can accept an
845 * older device ... but not too old.
847 if (ev1
< mddev
->bitmap
->events_cleared
)
850 if (ev1
< mddev
->events
)
851 /* just a hot-add of a new device, leave raid_disk at -1 */
855 if (mddev
->level
!= LEVEL_MULTIPATH
) {
856 desc
= sb
->disks
+ rdev
->desc_nr
;
858 if (desc
->state
& (1<<MD_DISK_FAULTY
))
859 set_bit(Faulty
, &rdev
->flags
);
860 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
861 desc->raid_disk < mddev->raid_disks */) {
862 set_bit(In_sync
, &rdev
->flags
);
863 rdev
->raid_disk
= desc
->raid_disk
;
865 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
866 set_bit(WriteMostly
, &rdev
->flags
);
867 } else /* MULTIPATH are always insync */
868 set_bit(In_sync
, &rdev
->flags
);
873 * sync_super for 0.90.0
875 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
878 struct list_head
*tmp
;
880 int next_spare
= mddev
->raid_disks
;
883 /* make rdev->sb match mddev data..
886 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
887 * 3/ any empty disks < next_spare become removed
889 * disks[0] gets initialised to REMOVED because
890 * we cannot be sure from other fields if it has
891 * been initialised or not.
894 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
896 rdev
->sb_size
= MD_SB_BYTES
;
898 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
900 memset(sb
, 0, sizeof(*sb
));
902 sb
->md_magic
= MD_SB_MAGIC
;
903 sb
->major_version
= mddev
->major_version
;
904 sb
->patch_version
= mddev
->patch_version
;
905 sb
->gvalid_words
= 0; /* ignored */
906 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
907 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
908 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
909 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
911 sb
->ctime
= mddev
->ctime
;
912 sb
->level
= mddev
->level
;
913 sb
->size
= mddev
->size
;
914 sb
->raid_disks
= mddev
->raid_disks
;
915 sb
->md_minor
= mddev
->md_minor
;
916 sb
->not_persistent
= 0;
917 sb
->utime
= mddev
->utime
;
919 sb
->events_hi
= (mddev
->events
>>32);
920 sb
->events_lo
= (u32
)mddev
->events
;
922 if (mddev
->reshape_position
== MaxSector
)
923 sb
->minor_version
= 90;
925 sb
->minor_version
= 91;
926 sb
->reshape_position
= mddev
->reshape_position
;
927 sb
->new_level
= mddev
->new_level
;
928 sb
->delta_disks
= mddev
->delta_disks
;
929 sb
->new_layout
= mddev
->new_layout
;
930 sb
->new_chunk
= mddev
->new_chunk
;
932 mddev
->minor_version
= sb
->minor_version
;
935 sb
->recovery_cp
= mddev
->recovery_cp
;
936 sb
->cp_events_hi
= (mddev
->events
>>32);
937 sb
->cp_events_lo
= (u32
)mddev
->events
;
938 if (mddev
->recovery_cp
== MaxSector
)
939 sb
->state
= (1<< MD_SB_CLEAN
);
943 sb
->layout
= mddev
->layout
;
944 sb
->chunk_size
= mddev
->chunk_size
;
946 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
947 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
949 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
950 rdev_for_each(rdev2
, tmp
, mddev
) {
953 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
954 && !test_bit(Faulty
, &rdev2
->flags
))
955 desc_nr
= rdev2
->raid_disk
;
957 desc_nr
= next_spare
++;
958 rdev2
->desc_nr
= desc_nr
;
959 d
= &sb
->disks
[rdev2
->desc_nr
];
961 d
->number
= rdev2
->desc_nr
;
962 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
963 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
964 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
965 && !test_bit(Faulty
, &rdev2
->flags
))
966 d
->raid_disk
= rdev2
->raid_disk
;
968 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
969 if (test_bit(Faulty
, &rdev2
->flags
))
970 d
->state
= (1<<MD_DISK_FAULTY
);
971 else if (test_bit(In_sync
, &rdev2
->flags
)) {
972 d
->state
= (1<<MD_DISK_ACTIVE
);
973 d
->state
|= (1<<MD_DISK_SYNC
);
981 if (test_bit(WriteMostly
, &rdev2
->flags
))
982 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
984 /* now set the "removed" and "faulty" bits on any missing devices */
985 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
986 mdp_disk_t
*d
= &sb
->disks
[i
];
987 if (d
->state
== 0 && d
->number
== 0) {
990 d
->state
= (1<<MD_DISK_REMOVED
);
991 d
->state
|= (1<<MD_DISK_FAULTY
);
995 sb
->nr_disks
= nr_disks
;
996 sb
->active_disks
= active
;
997 sb
->working_disks
= working
;
998 sb
->failed_disks
= failed
;
999 sb
->spare_disks
= spare
;
1001 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1002 sb
->sb_csum
= calc_sb_csum(sb
);
1006 * version 1 superblock
1009 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1013 unsigned long long newcsum
;
1014 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1015 __le32
*isuper
= (__le32
*)sb
;
1018 disk_csum
= sb
->sb_csum
;
1021 for (i
=0; size
>=4; size
-= 4 )
1022 newcsum
+= le32_to_cpu(*isuper
++);
1025 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1027 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1028 sb
->sb_csum
= disk_csum
;
1029 return cpu_to_le32(csum
);
1032 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1034 struct mdp_superblock_1
*sb
;
1037 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1041 * Calculate the position of the superblock.
1042 * It is always aligned to a 4K boundary and
1043 * depeding on minor_version, it can be:
1044 * 0: At least 8K, but less than 12K, from end of device
1045 * 1: At start of device
1046 * 2: 4K from start of device.
1048 switch(minor_version
) {
1050 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1052 sb_offset
&= ~(sector_t
)(4*2-1);
1053 /* convert from sectors to K */
1065 rdev
->sb_offset
= sb_offset
;
1067 /* superblock is rarely larger than 1K, but it can be larger,
1068 * and it is safe to read 4k, so we do that
1070 ret
= read_disk_sb(rdev
, 4096);
1071 if (ret
) return ret
;
1074 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1076 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1077 sb
->major_version
!= cpu_to_le32(1) ||
1078 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1079 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1080 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1083 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1084 printk("md: invalid superblock checksum on %s\n",
1085 bdevname(rdev
->bdev
,b
));
1088 if (le64_to_cpu(sb
->data_size
) < 10) {
1089 printk("md: data_size too small on %s\n",
1090 bdevname(rdev
->bdev
,b
));
1093 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1094 if (sb
->level
!= cpu_to_le32(1) &&
1095 sb
->level
!= cpu_to_le32(4) &&
1096 sb
->level
!= cpu_to_le32(5) &&
1097 sb
->level
!= cpu_to_le32(6) &&
1098 sb
->level
!= cpu_to_le32(10)) {
1100 "md: bitmaps not supported for this level.\n");
1105 rdev
->preferred_minor
= 0xffff;
1106 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1107 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1109 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1110 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1111 if (rdev
->sb_size
& bmask
)
1112 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1115 && rdev
->data_offset
< sb_offset
+ (rdev
->sb_size
/512))
1118 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1121 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1127 struct mdp_superblock_1
*refsb
=
1128 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1130 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1131 sb
->level
!= refsb
->level
||
1132 sb
->layout
!= refsb
->layout
||
1133 sb
->chunksize
!= refsb
->chunksize
) {
1134 printk(KERN_WARNING
"md: %s has strangely different"
1135 " superblock to %s\n",
1136 bdevname(rdev
->bdev
,b
),
1137 bdevname(refdev
->bdev
,b2
));
1140 ev1
= le64_to_cpu(sb
->events
);
1141 ev2
= le64_to_cpu(refsb
->events
);
1149 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1151 rdev
->size
= rdev
->sb_offset
;
1152 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1154 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1155 if (le32_to_cpu(sb
->chunksize
))
1156 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1158 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1163 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1165 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1166 __u64 ev1
= le64_to_cpu(sb
->events
);
1168 rdev
->raid_disk
= -1;
1169 clear_bit(Faulty
, &rdev
->flags
);
1170 clear_bit(In_sync
, &rdev
->flags
);
1171 clear_bit(WriteMostly
, &rdev
->flags
);
1172 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1174 if (mddev
->raid_disks
== 0) {
1175 mddev
->major_version
= 1;
1176 mddev
->patch_version
= 0;
1177 mddev
->external
= 0;
1178 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1179 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1180 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1181 mddev
->level
= le32_to_cpu(sb
->level
);
1182 mddev
->clevel
[0] = 0;
1183 mddev
->layout
= le32_to_cpu(sb
->layout
);
1184 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1185 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1186 mddev
->events
= ev1
;
1187 mddev
->bitmap_offset
= 0;
1188 mddev
->default_bitmap_offset
= 1024 >> 9;
1190 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1191 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1193 mddev
->max_disks
= (4096-256)/2;
1195 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1196 mddev
->bitmap_file
== NULL
)
1197 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1199 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1200 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1201 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1202 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1203 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1204 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1206 mddev
->reshape_position
= MaxSector
;
1207 mddev
->delta_disks
= 0;
1208 mddev
->new_level
= mddev
->level
;
1209 mddev
->new_layout
= mddev
->layout
;
1210 mddev
->new_chunk
= mddev
->chunk_size
;
1213 } else if (mddev
->pers
== NULL
) {
1214 /* Insist of good event counter while assembling */
1216 if (ev1
< mddev
->events
)
1218 } else if (mddev
->bitmap
) {
1219 /* If adding to array with a bitmap, then we can accept an
1220 * older device, but not too old.
1222 if (ev1
< mddev
->bitmap
->events_cleared
)
1225 if (ev1
< mddev
->events
)
1226 /* just a hot-add of a new device, leave raid_disk at -1 */
1229 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1231 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1233 case 0xffff: /* spare */
1235 case 0xfffe: /* faulty */
1236 set_bit(Faulty
, &rdev
->flags
);
1239 if ((le32_to_cpu(sb
->feature_map
) &
1240 MD_FEATURE_RECOVERY_OFFSET
))
1241 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1243 set_bit(In_sync
, &rdev
->flags
);
1244 rdev
->raid_disk
= role
;
1247 if (sb
->devflags
& WriteMostly1
)
1248 set_bit(WriteMostly
, &rdev
->flags
);
1249 } else /* MULTIPATH are always insync */
1250 set_bit(In_sync
, &rdev
->flags
);
1255 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1257 struct mdp_superblock_1
*sb
;
1258 struct list_head
*tmp
;
1261 /* make rdev->sb match mddev and rdev data. */
1263 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1265 sb
->feature_map
= 0;
1267 sb
->recovery_offset
= cpu_to_le64(0);
1268 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1269 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1270 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1272 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1273 sb
->events
= cpu_to_le64(mddev
->events
);
1275 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1277 sb
->resync_offset
= cpu_to_le64(0);
1279 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1281 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1282 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1284 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1285 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1286 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1289 if (rdev
->raid_disk
>= 0 &&
1290 !test_bit(In_sync
, &rdev
->flags
) &&
1291 rdev
->recovery_offset
> 0) {
1292 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1293 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1296 if (mddev
->reshape_position
!= MaxSector
) {
1297 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1298 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1299 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1300 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1301 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1302 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1306 rdev_for_each(rdev2
, tmp
, mddev
)
1307 if (rdev2
->desc_nr
+1 > max_dev
)
1308 max_dev
= rdev2
->desc_nr
+1;
1310 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1311 sb
->max_dev
= cpu_to_le32(max_dev
);
1312 for (i
=0; i
<max_dev
;i
++)
1313 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1315 rdev_for_each(rdev2
, tmp
, mddev
) {
1317 if (test_bit(Faulty
, &rdev2
->flags
))
1318 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1319 else if (test_bit(In_sync
, &rdev2
->flags
))
1320 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1321 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1322 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1324 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1327 sb
->sb_csum
= calc_sb_1_csum(sb
);
1331 static struct super_type super_types
[] = {
1334 .owner
= THIS_MODULE
,
1335 .load_super
= super_90_load
,
1336 .validate_super
= super_90_validate
,
1337 .sync_super
= super_90_sync
,
1341 .owner
= THIS_MODULE
,
1342 .load_super
= super_1_load
,
1343 .validate_super
= super_1_validate
,
1344 .sync_super
= super_1_sync
,
1348 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1350 struct list_head
*tmp
, *tmp2
;
1351 mdk_rdev_t
*rdev
, *rdev2
;
1353 rdev_for_each(rdev
, tmp
, mddev1
)
1354 rdev_for_each(rdev2
, tmp2
, mddev2
)
1355 if (rdev
->bdev
->bd_contains
==
1356 rdev2
->bdev
->bd_contains
)
1362 static LIST_HEAD(pending_raid_disks
);
1364 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1366 char b
[BDEVNAME_SIZE
];
1376 /* prevent duplicates */
1377 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1380 /* make sure rdev->size exceeds mddev->size */
1381 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1383 /* Cannot change size, so fail
1384 * If mddev->level <= 0, then we don't care
1385 * about aligning sizes (e.g. linear)
1387 if (mddev
->level
> 0)
1390 mddev
->size
= rdev
->size
;
1393 /* Verify rdev->desc_nr is unique.
1394 * If it is -1, assign a free number, else
1395 * check number is not in use
1397 if (rdev
->desc_nr
< 0) {
1399 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1400 while (find_rdev_nr(mddev
, choice
))
1402 rdev
->desc_nr
= choice
;
1404 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1407 bdevname(rdev
->bdev
,b
);
1408 while ( (s
=strchr(b
, '/')) != NULL
)
1411 rdev
->mddev
= mddev
;
1412 printk(KERN_INFO
"md: bind<%s>\n", b
);
1414 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1417 if (rdev
->bdev
->bd_part
)
1418 ko
= &rdev
->bdev
->bd_part
->dev
.kobj
;
1420 ko
= &rdev
->bdev
->bd_disk
->dev
.kobj
;
1421 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1422 kobject_del(&rdev
->kobj
);
1425 list_add(&rdev
->same_set
, &mddev
->disks
);
1426 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1430 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1435 static void md_delayed_delete(struct work_struct
*ws
)
1437 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1438 kobject_del(&rdev
->kobj
);
1439 kobject_put(&rdev
->kobj
);
1442 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1444 char b
[BDEVNAME_SIZE
];
1449 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1450 list_del_init(&rdev
->same_set
);
1451 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1453 sysfs_remove_link(&rdev
->kobj
, "block");
1455 /* We need to delay this, otherwise we can deadlock when
1456 * writing to 'remove' to "dev/state"
1458 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1459 kobject_get(&rdev
->kobj
);
1460 schedule_work(&rdev
->del_work
);
1464 * prevent the device from being mounted, repartitioned or
1465 * otherwise reused by a RAID array (or any other kernel
1466 * subsystem), by bd_claiming the device.
1468 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1471 struct block_device
*bdev
;
1472 char b
[BDEVNAME_SIZE
];
1474 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1476 printk(KERN_ERR
"md: could not open %s.\n",
1477 __bdevname(dev
, b
));
1478 return PTR_ERR(bdev
);
1480 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1482 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1488 set_bit(AllReserved
, &rdev
->flags
);
1493 static void unlock_rdev(mdk_rdev_t
*rdev
)
1495 struct block_device
*bdev
= rdev
->bdev
;
1503 void md_autodetect_dev(dev_t dev
);
1505 static void export_rdev(mdk_rdev_t
* rdev
)
1507 char b
[BDEVNAME_SIZE
];
1508 printk(KERN_INFO
"md: export_rdev(%s)\n",
1509 bdevname(rdev
->bdev
,b
));
1513 list_del_init(&rdev
->same_set
);
1515 if (test_bit(AutoDetected
, &rdev
->flags
))
1516 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1519 kobject_put(&rdev
->kobj
);
1522 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1524 unbind_rdev_from_array(rdev
);
1528 static void export_array(mddev_t
*mddev
)
1530 struct list_head
*tmp
;
1533 rdev_for_each(rdev
, tmp
, mddev
) {
1538 kick_rdev_from_array(rdev
);
1540 if (!list_empty(&mddev
->disks
))
1542 mddev
->raid_disks
= 0;
1543 mddev
->major_version
= 0;
1546 static void print_desc(mdp_disk_t
*desc
)
1548 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1549 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1552 static void print_sb(mdp_super_t
*sb
)
1557 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1558 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1559 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1561 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1562 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1563 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1564 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1565 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1566 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1567 sb
->failed_disks
, sb
->spare_disks
,
1568 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1571 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1574 desc
= sb
->disks
+ i
;
1575 if (desc
->number
|| desc
->major
|| desc
->minor
||
1576 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1577 printk(" D %2d: ", i
);
1581 printk(KERN_INFO
"md: THIS: ");
1582 print_desc(&sb
->this_disk
);
1586 static void print_rdev(mdk_rdev_t
*rdev
)
1588 char b
[BDEVNAME_SIZE
];
1589 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1590 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1591 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1593 if (rdev
->sb_loaded
) {
1594 printk(KERN_INFO
"md: rdev superblock:\n");
1595 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1597 printk(KERN_INFO
"md: no rdev superblock!\n");
1600 static void md_print_devices(void)
1602 struct list_head
*tmp
, *tmp2
;
1605 char b
[BDEVNAME_SIZE
];
1608 printk("md: **********************************\n");
1609 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1610 printk("md: **********************************\n");
1611 for_each_mddev(mddev
, tmp
) {
1614 bitmap_print_sb(mddev
->bitmap
);
1616 printk("%s: ", mdname(mddev
));
1617 rdev_for_each(rdev
, tmp2
, mddev
)
1618 printk("<%s>", bdevname(rdev
->bdev
,b
));
1621 rdev_for_each(rdev
, tmp2
, mddev
)
1624 printk("md: **********************************\n");
1629 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1631 /* Update each superblock (in-memory image), but
1632 * if we are allowed to, skip spares which already
1633 * have the right event counter, or have one earlier
1634 * (which would mean they aren't being marked as dirty
1635 * with the rest of the array)
1638 struct list_head
*tmp
;
1640 rdev_for_each(rdev
, tmp
, mddev
) {
1641 if (rdev
->sb_events
== mddev
->events
||
1643 rdev
->raid_disk
< 0 &&
1644 (rdev
->sb_events
&1)==0 &&
1645 rdev
->sb_events
+1 == mddev
->events
)) {
1646 /* Don't update this superblock */
1647 rdev
->sb_loaded
= 2;
1649 super_types
[mddev
->major_version
].
1650 sync_super(mddev
, rdev
);
1651 rdev
->sb_loaded
= 1;
1656 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1658 struct list_head
*tmp
;
1663 if (mddev
->external
)
1666 spin_lock_irq(&mddev
->write_lock
);
1668 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1669 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1671 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1672 /* just a clean<-> dirty transition, possibly leave spares alone,
1673 * though if events isn't the right even/odd, we will have to do
1679 if (mddev
->degraded
)
1680 /* If the array is degraded, then skipping spares is both
1681 * dangerous and fairly pointless.
1682 * Dangerous because a device that was removed from the array
1683 * might have a event_count that still looks up-to-date,
1684 * so it can be re-added without a resync.
1685 * Pointless because if there are any spares to skip,
1686 * then a recovery will happen and soon that array won't
1687 * be degraded any more and the spare can go back to sleep then.
1691 sync_req
= mddev
->in_sync
;
1692 mddev
->utime
= get_seconds();
1694 /* If this is just a dirty<->clean transition, and the array is clean
1695 * and 'events' is odd, we can roll back to the previous clean state */
1697 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1698 && (mddev
->events
& 1)
1699 && mddev
->events
!= 1)
1702 /* otherwise we have to go forward and ... */
1704 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1705 /* .. if the array isn't clean, insist on an odd 'events' */
1706 if ((mddev
->events
&1)==0) {
1711 /* otherwise insist on an even 'events' (for clean states) */
1712 if ((mddev
->events
&1)) {
1719 if (!mddev
->events
) {
1721 * oops, this 64-bit counter should never wrap.
1722 * Either we are in around ~1 trillion A.C., assuming
1723 * 1 reboot per second, or we have a bug:
1730 * do not write anything to disk if using
1731 * nonpersistent superblocks
1733 if (!mddev
->persistent
) {
1734 if (!mddev
->external
)
1735 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1737 spin_unlock_irq(&mddev
->write_lock
);
1738 wake_up(&mddev
->sb_wait
);
1741 sync_sbs(mddev
, nospares
);
1742 spin_unlock_irq(&mddev
->write_lock
);
1745 "md: updating %s RAID superblock on device (in sync %d)\n",
1746 mdname(mddev
),mddev
->in_sync
);
1748 bitmap_update_sb(mddev
->bitmap
);
1749 rdev_for_each(rdev
, tmp
, mddev
) {
1750 char b
[BDEVNAME_SIZE
];
1751 dprintk(KERN_INFO
"md: ");
1752 if (rdev
->sb_loaded
!= 1)
1753 continue; /* no noise on spare devices */
1754 if (test_bit(Faulty
, &rdev
->flags
))
1755 dprintk("(skipping faulty ");
1757 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1758 if (!test_bit(Faulty
, &rdev
->flags
)) {
1759 md_super_write(mddev
,rdev
,
1760 rdev
->sb_offset
<<1, rdev
->sb_size
,
1762 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1763 bdevname(rdev
->bdev
,b
),
1764 (unsigned long long)rdev
->sb_offset
);
1765 rdev
->sb_events
= mddev
->events
;
1769 if (mddev
->level
== LEVEL_MULTIPATH
)
1770 /* only need to write one superblock... */
1773 md_super_wait(mddev
);
1774 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1776 spin_lock_irq(&mddev
->write_lock
);
1777 if (mddev
->in_sync
!= sync_req
||
1778 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1779 /* have to write it out again */
1780 spin_unlock_irq(&mddev
->write_lock
);
1783 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1784 spin_unlock_irq(&mddev
->write_lock
);
1785 wake_up(&mddev
->sb_wait
);
1789 /* words written to sysfs files may, or my not, be \n terminated.
1790 * We want to accept with case. For this we use cmd_match.
1792 static int cmd_match(const char *cmd
, const char *str
)
1794 /* See if cmd, written into a sysfs file, matches
1795 * str. They must either be the same, or cmd can
1796 * have a trailing newline
1798 while (*cmd
&& *str
&& *cmd
== *str
) {
1809 struct rdev_sysfs_entry
{
1810 struct attribute attr
;
1811 ssize_t (*show
)(mdk_rdev_t
*, char *);
1812 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1816 state_show(mdk_rdev_t
*rdev
, char *page
)
1821 if (test_bit(Faulty
, &rdev
->flags
)) {
1822 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1825 if (test_bit(In_sync
, &rdev
->flags
)) {
1826 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1829 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1830 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1833 if (test_bit(Blocked
, &rdev
->flags
)) {
1834 len
+= sprintf(page
+len
, "%sblocked", sep
);
1837 if (!test_bit(Faulty
, &rdev
->flags
) &&
1838 !test_bit(In_sync
, &rdev
->flags
)) {
1839 len
+= sprintf(page
+len
, "%sspare", sep
);
1842 return len
+sprintf(page
+len
, "\n");
1846 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1849 * faulty - simulates and error
1850 * remove - disconnects the device
1851 * writemostly - sets write_mostly
1852 * -writemostly - clears write_mostly
1853 * blocked - sets the Blocked flag
1854 * -blocked - clears the Blocked flag
1857 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1858 md_error(rdev
->mddev
, rdev
);
1860 } else if (cmd_match(buf
, "remove")) {
1861 if (rdev
->raid_disk
>= 0)
1864 mddev_t
*mddev
= rdev
->mddev
;
1865 kick_rdev_from_array(rdev
);
1867 md_update_sb(mddev
, 1);
1868 md_new_event(mddev
);
1871 } else if (cmd_match(buf
, "writemostly")) {
1872 set_bit(WriteMostly
, &rdev
->flags
);
1874 } else if (cmd_match(buf
, "-writemostly")) {
1875 clear_bit(WriteMostly
, &rdev
->flags
);
1877 } else if (cmd_match(buf
, "blocked")) {
1878 set_bit(Blocked
, &rdev
->flags
);
1880 } else if (cmd_match(buf
, "-blocked")) {
1881 clear_bit(Blocked
, &rdev
->flags
);
1882 wake_up(&rdev
->blocked_wait
);
1883 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1884 md_wakeup_thread(rdev
->mddev
->thread
);
1888 return err
? err
: len
;
1890 static struct rdev_sysfs_entry rdev_state
=
1891 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1894 errors_show(mdk_rdev_t
*rdev
, char *page
)
1896 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1900 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1903 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1904 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1905 atomic_set(&rdev
->corrected_errors
, n
);
1910 static struct rdev_sysfs_entry rdev_errors
=
1911 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1914 slot_show(mdk_rdev_t
*rdev
, char *page
)
1916 if (rdev
->raid_disk
< 0)
1917 return sprintf(page
, "none\n");
1919 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1923 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1928 int slot
= simple_strtoul(buf
, &e
, 10);
1929 if (strncmp(buf
, "none", 4)==0)
1931 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1933 if (rdev
->mddev
->pers
) {
1934 /* Setting 'slot' on an active array requires also
1935 * updating the 'rd%d' link, and communicating
1936 * with the personality with ->hot_*_disk.
1937 * For now we only support removing
1938 * failed/spare devices. This normally happens automatically,
1939 * but not when the metadata is externally managed.
1943 if (rdev
->raid_disk
== -1)
1945 /* personality does all needed checks */
1946 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
1948 err
= rdev
->mddev
->pers
->
1949 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
1952 sprintf(nm
, "rd%d", rdev
->raid_disk
);
1953 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
1954 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1955 md_wakeup_thread(rdev
->mddev
->thread
);
1957 if (slot
>= rdev
->mddev
->raid_disks
)
1959 rdev
->raid_disk
= slot
;
1960 /* assume it is working */
1961 clear_bit(Faulty
, &rdev
->flags
);
1962 clear_bit(WriteMostly
, &rdev
->flags
);
1963 set_bit(In_sync
, &rdev
->flags
);
1969 static struct rdev_sysfs_entry rdev_slot
=
1970 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
1973 offset_show(mdk_rdev_t
*rdev
, char *page
)
1975 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1979 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1982 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1983 if (e
==buf
|| (*e
&& *e
!= '\n'))
1985 if (rdev
->mddev
->pers
)
1987 if (rdev
->size
&& rdev
->mddev
->external
)
1988 /* Must set offset before size, so overlap checks
1991 rdev
->data_offset
= offset
;
1995 static struct rdev_sysfs_entry rdev_offset
=
1996 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
1999 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2001 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
2004 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2006 /* check if two start/length pairs overlap */
2015 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2018 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2019 unsigned long long oldsize
= rdev
->size
;
2020 mddev_t
*my_mddev
= rdev
->mddev
;
2022 if (e
==buf
|| (*e
&& *e
!= '\n'))
2027 if (size
> oldsize
&& rdev
->mddev
->external
) {
2028 /* need to check that all other rdevs with the same ->bdev
2029 * do not overlap. We need to unlock the mddev to avoid
2030 * a deadlock. We have already changed rdev->size, and if
2031 * we have to change it back, we will have the lock again.
2035 struct list_head
*tmp
, *tmp2
;
2037 mddev_unlock(my_mddev
);
2038 for_each_mddev(mddev
, tmp
) {
2042 rdev_for_each(rdev2
, tmp2
, mddev
)
2043 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2044 (rdev
->bdev
== rdev2
->bdev
&&
2046 overlaps(rdev
->data_offset
, rdev
->size
,
2047 rdev2
->data_offset
, rdev2
->size
))) {
2051 mddev_unlock(mddev
);
2057 mddev_lock(my_mddev
);
2059 /* Someone else could have slipped in a size
2060 * change here, but doing so is just silly.
2061 * We put oldsize back because we *know* it is
2062 * safe, and trust userspace not to race with
2065 rdev
->size
= oldsize
;
2069 if (size
< my_mddev
->size
|| my_mddev
->size
== 0)
2070 my_mddev
->size
= size
;
2074 static struct rdev_sysfs_entry rdev_size
=
2075 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2077 static struct attribute
*rdev_default_attrs
[] = {
2086 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2088 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2089 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2090 mddev_t
*mddev
= rdev
->mddev
;
2096 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2098 if (rdev
->mddev
== NULL
)
2101 rv
= entry
->show(rdev
, page
);
2102 mddev_unlock(mddev
);
2108 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2109 const char *page
, size_t length
)
2111 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2112 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2114 mddev_t
*mddev
= rdev
->mddev
;
2118 if (!capable(CAP_SYS_ADMIN
))
2120 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2122 if (rdev
->mddev
== NULL
)
2125 rv
= entry
->store(rdev
, page
, length
);
2126 mddev_unlock(mddev
);
2131 static void rdev_free(struct kobject
*ko
)
2133 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2136 static struct sysfs_ops rdev_sysfs_ops
= {
2137 .show
= rdev_attr_show
,
2138 .store
= rdev_attr_store
,
2140 static struct kobj_type rdev_ktype
= {
2141 .release
= rdev_free
,
2142 .sysfs_ops
= &rdev_sysfs_ops
,
2143 .default_attrs
= rdev_default_attrs
,
2147 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2149 * mark the device faulty if:
2151 * - the device is nonexistent (zero size)
2152 * - the device has no valid superblock
2154 * a faulty rdev _never_ has rdev->sb set.
2156 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2158 char b
[BDEVNAME_SIZE
];
2163 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2165 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2166 return ERR_PTR(-ENOMEM
);
2169 if ((err
= alloc_disk_sb(rdev
)))
2172 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2176 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2179 rdev
->saved_raid_disk
= -1;
2180 rdev
->raid_disk
= -1;
2182 rdev
->data_offset
= 0;
2183 rdev
->sb_events
= 0;
2184 atomic_set(&rdev
->nr_pending
, 0);
2185 atomic_set(&rdev
->read_errors
, 0);
2186 atomic_set(&rdev
->corrected_errors
, 0);
2188 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2191 "md: %s has zero or unknown size, marking faulty!\n",
2192 bdevname(rdev
->bdev
,b
));
2197 if (super_format
>= 0) {
2198 err
= super_types
[super_format
].
2199 load_super(rdev
, NULL
, super_minor
);
2200 if (err
== -EINVAL
) {
2202 "md: %s does not have a valid v%d.%d "
2203 "superblock, not importing!\n",
2204 bdevname(rdev
->bdev
,b
),
2205 super_format
, super_minor
);
2210 "md: could not read %s's sb, not importing!\n",
2211 bdevname(rdev
->bdev
,b
));
2216 INIT_LIST_HEAD(&rdev
->same_set
);
2217 init_waitqueue_head(&rdev
->blocked_wait
);
2222 if (rdev
->sb_page
) {
2228 return ERR_PTR(err
);
2232 * Check a full RAID array for plausibility
2236 static void analyze_sbs(mddev_t
* mddev
)
2239 struct list_head
*tmp
;
2240 mdk_rdev_t
*rdev
, *freshest
;
2241 char b
[BDEVNAME_SIZE
];
2244 rdev_for_each(rdev
, tmp
, mddev
)
2245 switch (super_types
[mddev
->major_version
].
2246 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2254 "md: fatal superblock inconsistency in %s"
2255 " -- removing from array\n",
2256 bdevname(rdev
->bdev
,b
));
2257 kick_rdev_from_array(rdev
);
2261 super_types
[mddev
->major_version
].
2262 validate_super(mddev
, freshest
);
2265 rdev_for_each(rdev
, tmp
, mddev
) {
2266 if (rdev
!= freshest
)
2267 if (super_types
[mddev
->major_version
].
2268 validate_super(mddev
, rdev
)) {
2269 printk(KERN_WARNING
"md: kicking non-fresh %s"
2271 bdevname(rdev
->bdev
,b
));
2272 kick_rdev_from_array(rdev
);
2275 if (mddev
->level
== LEVEL_MULTIPATH
) {
2276 rdev
->desc_nr
= i
++;
2277 rdev
->raid_disk
= rdev
->desc_nr
;
2278 set_bit(In_sync
, &rdev
->flags
);
2279 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2280 rdev
->raid_disk
= -1;
2281 clear_bit(In_sync
, &rdev
->flags
);
2287 if (mddev
->recovery_cp
!= MaxSector
&&
2289 printk(KERN_ERR
"md: %s: raid array is not clean"
2290 " -- starting background reconstruction\n",
2296 safe_delay_show(mddev_t
*mddev
, char *page
)
2298 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2299 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2302 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2310 /* remove a period, and count digits after it */
2311 if (len
>= sizeof(buf
))
2313 strlcpy(buf
, cbuf
, len
);
2315 for (i
=0; i
<len
; i
++) {
2317 if (isdigit(buf
[i
])) {
2322 } else if (buf
[i
] == '.') {
2327 msec
= simple_strtoul(buf
, &e
, 10);
2328 if (e
== buf
|| (*e
&& *e
!= '\n'))
2330 msec
= (msec
* 1000) / scale
;
2332 mddev
->safemode_delay
= 0;
2334 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2335 if (mddev
->safemode_delay
== 0)
2336 mddev
->safemode_delay
= 1;
2340 static struct md_sysfs_entry md_safe_delay
=
2341 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2344 level_show(mddev_t
*mddev
, char *page
)
2346 struct mdk_personality
*p
= mddev
->pers
;
2348 return sprintf(page
, "%s\n", p
->name
);
2349 else if (mddev
->clevel
[0])
2350 return sprintf(page
, "%s\n", mddev
->clevel
);
2351 else if (mddev
->level
!= LEVEL_NONE
)
2352 return sprintf(page
, "%d\n", mddev
->level
);
2358 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2365 if (len
>= sizeof(mddev
->clevel
))
2367 strncpy(mddev
->clevel
, buf
, len
);
2368 if (mddev
->clevel
[len
-1] == '\n')
2370 mddev
->clevel
[len
] = 0;
2371 mddev
->level
= LEVEL_NONE
;
2375 static struct md_sysfs_entry md_level
=
2376 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2380 layout_show(mddev_t
*mddev
, char *page
)
2382 /* just a number, not meaningful for all levels */
2383 if (mddev
->reshape_position
!= MaxSector
&&
2384 mddev
->layout
!= mddev
->new_layout
)
2385 return sprintf(page
, "%d (%d)\n",
2386 mddev
->new_layout
, mddev
->layout
);
2387 return sprintf(page
, "%d\n", mddev
->layout
);
2391 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2394 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2396 if (!*buf
|| (*e
&& *e
!= '\n'))
2401 if (mddev
->reshape_position
!= MaxSector
)
2402 mddev
->new_layout
= n
;
2407 static struct md_sysfs_entry md_layout
=
2408 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2412 raid_disks_show(mddev_t
*mddev
, char *page
)
2414 if (mddev
->raid_disks
== 0)
2416 if (mddev
->reshape_position
!= MaxSector
&&
2417 mddev
->delta_disks
!= 0)
2418 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2419 mddev
->raid_disks
- mddev
->delta_disks
);
2420 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2423 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2426 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2430 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2432 if (!*buf
|| (*e
&& *e
!= '\n'))
2436 rv
= update_raid_disks(mddev
, n
);
2437 else if (mddev
->reshape_position
!= MaxSector
) {
2438 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2439 mddev
->delta_disks
= n
- olddisks
;
2440 mddev
->raid_disks
= n
;
2442 mddev
->raid_disks
= n
;
2443 return rv
? rv
: len
;
2445 static struct md_sysfs_entry md_raid_disks
=
2446 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2449 chunk_size_show(mddev_t
*mddev
, char *page
)
2451 if (mddev
->reshape_position
!= MaxSector
&&
2452 mddev
->chunk_size
!= mddev
->new_chunk
)
2453 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2455 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2459 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2461 /* can only set chunk_size if array is not yet active */
2463 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2465 if (!*buf
|| (*e
&& *e
!= '\n'))
2470 else if (mddev
->reshape_position
!= MaxSector
)
2471 mddev
->new_chunk
= n
;
2473 mddev
->chunk_size
= n
;
2476 static struct md_sysfs_entry md_chunk_size
=
2477 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2480 resync_start_show(mddev_t
*mddev
, char *page
)
2482 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2486 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2489 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2493 if (!*buf
|| (*e
&& *e
!= '\n'))
2496 mddev
->recovery_cp
= n
;
2499 static struct md_sysfs_entry md_resync_start
=
2500 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2503 * The array state can be:
2506 * No devices, no size, no level
2507 * Equivalent to STOP_ARRAY ioctl
2509 * May have some settings, but array is not active
2510 * all IO results in error
2511 * When written, doesn't tear down array, but just stops it
2512 * suspended (not supported yet)
2513 * All IO requests will block. The array can be reconfigured.
2514 * Writing this, if accepted, will block until array is quiessent
2516 * no resync can happen. no superblocks get written.
2517 * write requests fail
2519 * like readonly, but behaves like 'clean' on a write request.
2521 * clean - no pending writes, but otherwise active.
2522 * When written to inactive array, starts without resync
2523 * If a write request arrives then
2524 * if metadata is known, mark 'dirty' and switch to 'active'.
2525 * if not known, block and switch to write-pending
2526 * If written to an active array that has pending writes, then fails.
2528 * fully active: IO and resync can be happening.
2529 * When written to inactive array, starts with resync
2532 * clean, but writes are blocked waiting for 'active' to be written.
2535 * like active, but no writes have been seen for a while (100msec).
2538 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2539 write_pending
, active_idle
, bad_word
};
2540 static char *array_states
[] = {
2541 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2542 "write-pending", "active-idle", NULL
};
2544 static int match_word(const char *word
, char **list
)
2547 for (n
=0; list
[n
]; n
++)
2548 if (cmd_match(word
, list
[n
]))
2554 array_state_show(mddev_t
*mddev
, char *page
)
2556 enum array_state st
= inactive
;
2569 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2571 else if (mddev
->safemode
)
2577 if (list_empty(&mddev
->disks
) &&
2578 mddev
->raid_disks
== 0 &&
2584 return sprintf(page
, "%s\n", array_states
[st
]);
2587 static int do_md_stop(mddev_t
* mddev
, int ro
);
2588 static int do_md_run(mddev_t
* mddev
);
2589 static int restart_array(mddev_t
*mddev
);
2592 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2595 enum array_state st
= match_word(buf
, array_states
);
2600 /* stopping an active array */
2601 if (atomic_read(&mddev
->active
) > 1)
2603 err
= do_md_stop(mddev
, 0);
2606 /* stopping an active array */
2608 if (atomic_read(&mddev
->active
) > 1)
2610 err
= do_md_stop(mddev
, 2);
2612 err
= 0; /* already inactive */
2615 break; /* not supported yet */
2618 err
= do_md_stop(mddev
, 1);
2621 set_disk_ro(mddev
->gendisk
, 1);
2622 err
= do_md_run(mddev
);
2628 err
= do_md_stop(mddev
, 1);
2630 err
= restart_array(mddev
);
2633 set_disk_ro(mddev
->gendisk
, 0);
2637 err
= do_md_run(mddev
);
2642 restart_array(mddev
);
2643 spin_lock_irq(&mddev
->write_lock
);
2644 if (atomic_read(&mddev
->writes_pending
) == 0) {
2645 if (mddev
->in_sync
== 0) {
2647 if (mddev
->safemode
== 1)
2648 mddev
->safemode
= 0;
2649 if (mddev
->persistent
)
2650 set_bit(MD_CHANGE_CLEAN
,
2656 spin_unlock_irq(&mddev
->write_lock
);
2659 mddev
->recovery_cp
= MaxSector
;
2660 err
= do_md_run(mddev
);
2665 restart_array(mddev
);
2666 if (mddev
->external
)
2667 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2668 wake_up(&mddev
->sb_wait
);
2672 set_disk_ro(mddev
->gendisk
, 0);
2673 err
= do_md_run(mddev
);
2678 /* these cannot be set */
2686 static struct md_sysfs_entry md_array_state
=
2687 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2690 null_show(mddev_t
*mddev
, char *page
)
2696 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2698 /* buf must be %d:%d\n? giving major and minor numbers */
2699 /* The new device is added to the array.
2700 * If the array has a persistent superblock, we read the
2701 * superblock to initialise info and check validity.
2702 * Otherwise, only checking done is that in bind_rdev_to_array,
2703 * which mainly checks size.
2706 int major
= simple_strtoul(buf
, &e
, 10);
2712 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2714 minor
= simple_strtoul(e
+1, &e
, 10);
2715 if (*e
&& *e
!= '\n')
2717 dev
= MKDEV(major
, minor
);
2718 if (major
!= MAJOR(dev
) ||
2719 minor
!= MINOR(dev
))
2723 if (mddev
->persistent
) {
2724 rdev
= md_import_device(dev
, mddev
->major_version
,
2725 mddev
->minor_version
);
2726 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2727 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2728 mdk_rdev_t
, same_set
);
2729 err
= super_types
[mddev
->major_version
]
2730 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2734 } else if (mddev
->external
)
2735 rdev
= md_import_device(dev
, -2, -1);
2737 rdev
= md_import_device(dev
, -1, -1);
2740 return PTR_ERR(rdev
);
2741 err
= bind_rdev_to_array(rdev
, mddev
);
2745 return err
? err
: len
;
2748 static struct md_sysfs_entry md_new_device
=
2749 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2752 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2755 unsigned long chunk
, end_chunk
;
2759 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2761 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2762 if (buf
== end
) break;
2763 if (*end
== '-') { /* range */
2765 end_chunk
= simple_strtoul(buf
, &end
, 0);
2766 if (buf
== end
) break;
2768 if (*end
&& !isspace(*end
)) break;
2769 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2771 while (isspace(*buf
)) buf
++;
2773 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2778 static struct md_sysfs_entry md_bitmap
=
2779 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2782 size_show(mddev_t
*mddev
, char *page
)
2784 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2787 static int update_size(mddev_t
*mddev
, unsigned long size
);
2790 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2792 /* If array is inactive, we can reduce the component size, but
2793 * not increase it (except from 0).
2794 * If array is active, we can try an on-line resize
2798 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2799 if (!*buf
|| *buf
== '\n' ||
2804 err
= update_size(mddev
, size
);
2805 md_update_sb(mddev
, 1);
2807 if (mddev
->size
== 0 ||
2813 return err
? err
: len
;
2816 static struct md_sysfs_entry md_size
=
2817 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2822 * 'none' for arrays with no metadata (good luck...)
2823 * 'external' for arrays with externally managed metadata,
2824 * or N.M for internally known formats
2827 metadata_show(mddev_t
*mddev
, char *page
)
2829 if (mddev
->persistent
)
2830 return sprintf(page
, "%d.%d\n",
2831 mddev
->major_version
, mddev
->minor_version
);
2832 else if (mddev
->external
)
2833 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
2835 return sprintf(page
, "none\n");
2839 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2843 if (!list_empty(&mddev
->disks
))
2846 if (cmd_match(buf
, "none")) {
2847 mddev
->persistent
= 0;
2848 mddev
->external
= 0;
2849 mddev
->major_version
= 0;
2850 mddev
->minor_version
= 90;
2853 if (strncmp(buf
, "external:", 9) == 0) {
2854 size_t namelen
= len
-9;
2855 if (namelen
>= sizeof(mddev
->metadata_type
))
2856 namelen
= sizeof(mddev
->metadata_type
)-1;
2857 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
2858 mddev
->metadata_type
[namelen
] = 0;
2859 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
2860 mddev
->metadata_type
[--namelen
] = 0;
2861 mddev
->persistent
= 0;
2862 mddev
->external
= 1;
2863 mddev
->major_version
= 0;
2864 mddev
->minor_version
= 90;
2867 major
= simple_strtoul(buf
, &e
, 10);
2868 if (e
==buf
|| *e
!= '.')
2871 minor
= simple_strtoul(buf
, &e
, 10);
2872 if (e
==buf
|| (*e
&& *e
!= '\n') )
2874 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2876 mddev
->major_version
= major
;
2877 mddev
->minor_version
= minor
;
2878 mddev
->persistent
= 1;
2879 mddev
->external
= 0;
2883 static struct md_sysfs_entry md_metadata
=
2884 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2887 action_show(mddev_t
*mddev
, char *page
)
2889 char *type
= "idle";
2890 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2891 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
2892 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2894 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2895 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2897 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2904 return sprintf(page
, "%s\n", type
);
2908 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2910 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2913 if (cmd_match(page
, "idle")) {
2914 if (mddev
->sync_thread
) {
2915 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2916 md_unregister_thread(mddev
->sync_thread
);
2917 mddev
->sync_thread
= NULL
;
2918 mddev
->recovery
= 0;
2920 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2921 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2923 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2924 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2925 else if (cmd_match(page
, "reshape")) {
2927 if (mddev
->pers
->start_reshape
== NULL
)
2929 err
= mddev
->pers
->start_reshape(mddev
);
2933 if (cmd_match(page
, "check"))
2934 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2935 else if (!cmd_match(page
, "repair"))
2937 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2938 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2940 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2941 md_wakeup_thread(mddev
->thread
);
2946 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2948 return sprintf(page
, "%llu\n",
2949 (unsigned long long) mddev
->resync_mismatches
);
2952 static struct md_sysfs_entry md_scan_mode
=
2953 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2956 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
2959 sync_min_show(mddev_t
*mddev
, char *page
)
2961 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2962 mddev
->sync_speed_min
? "local": "system");
2966 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2970 if (strncmp(buf
, "system", 6)==0) {
2971 mddev
->sync_speed_min
= 0;
2974 min
= simple_strtoul(buf
, &e
, 10);
2975 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2977 mddev
->sync_speed_min
= min
;
2981 static struct md_sysfs_entry md_sync_min
=
2982 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2985 sync_max_show(mddev_t
*mddev
, char *page
)
2987 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2988 mddev
->sync_speed_max
? "local": "system");
2992 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2996 if (strncmp(buf
, "system", 6)==0) {
2997 mddev
->sync_speed_max
= 0;
3000 max
= simple_strtoul(buf
, &e
, 10);
3001 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3003 mddev
->sync_speed_max
= max
;
3007 static struct md_sysfs_entry md_sync_max
=
3008 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3011 degraded_show(mddev_t
*mddev
, char *page
)
3013 return sprintf(page
, "%d\n", mddev
->degraded
);
3015 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3018 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3020 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3024 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3028 if (strict_strtol(buf
, 10, &n
))
3031 if (n
!= 0 && n
!= 1)
3034 mddev
->parallel_resync
= n
;
3036 if (mddev
->sync_thread
)
3037 wake_up(&resync_wait
);
3042 /* force parallel resync, even with shared block devices */
3043 static struct md_sysfs_entry md_sync_force_parallel
=
3044 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3045 sync_force_parallel_show
, sync_force_parallel_store
);
3048 sync_speed_show(mddev_t
*mddev
, char *page
)
3050 unsigned long resync
, dt
, db
;
3051 resync
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
));
3052 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
3054 db
= resync
- (mddev
->resync_mark_cnt
);
3055 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
3058 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3061 sync_completed_show(mddev_t
*mddev
, char *page
)
3063 unsigned long max_blocks
, resync
;
3065 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3066 max_blocks
= mddev
->resync_max_sectors
;
3068 max_blocks
= mddev
->size
<< 1;
3070 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3071 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3074 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3077 max_sync_show(mddev_t
*mddev
, char *page
)
3079 if (mddev
->resync_max
== MaxSector
)
3080 return sprintf(page
, "max\n");
3082 return sprintf(page
, "%llu\n",
3083 (unsigned long long)mddev
->resync_max
);
3086 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3088 if (strncmp(buf
, "max", 3) == 0)
3089 mddev
->resync_max
= MaxSector
;
3092 unsigned long long max
= simple_strtoull(buf
, &ep
, 10);
3093 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n'))
3095 if (max
< mddev
->resync_max
&&
3096 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3099 /* Must be a multiple of chunk_size */
3100 if (mddev
->chunk_size
) {
3101 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3104 mddev
->resync_max
= max
;
3106 wake_up(&mddev
->recovery_wait
);
3110 static struct md_sysfs_entry md_max_sync
=
3111 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3114 suspend_lo_show(mddev_t
*mddev
, char *page
)
3116 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3120 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3123 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3125 if (mddev
->pers
->quiesce
== NULL
)
3127 if (buf
== e
|| (*e
&& *e
!= '\n'))
3129 if (new >= mddev
->suspend_hi
||
3130 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3131 mddev
->suspend_lo
= new;
3132 mddev
->pers
->quiesce(mddev
, 2);
3137 static struct md_sysfs_entry md_suspend_lo
=
3138 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3142 suspend_hi_show(mddev_t
*mddev
, char *page
)
3144 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3148 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3151 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3153 if (mddev
->pers
->quiesce
== NULL
)
3155 if (buf
== e
|| (*e
&& *e
!= '\n'))
3157 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3158 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3159 mddev
->suspend_hi
= new;
3160 mddev
->pers
->quiesce(mddev
, 1);
3161 mddev
->pers
->quiesce(mddev
, 0);
3166 static struct md_sysfs_entry md_suspend_hi
=
3167 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3170 reshape_position_show(mddev_t
*mddev
, char *page
)
3172 if (mddev
->reshape_position
!= MaxSector
)
3173 return sprintf(page
, "%llu\n",
3174 (unsigned long long)mddev
->reshape_position
);
3175 strcpy(page
, "none\n");
3180 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3183 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3186 if (buf
== e
|| (*e
&& *e
!= '\n'))
3188 mddev
->reshape_position
= new;
3189 mddev
->delta_disks
= 0;
3190 mddev
->new_level
= mddev
->level
;
3191 mddev
->new_layout
= mddev
->layout
;
3192 mddev
->new_chunk
= mddev
->chunk_size
;
3196 static struct md_sysfs_entry md_reshape_position
=
3197 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3198 reshape_position_store
);
3201 static struct attribute
*md_default_attrs
[] = {
3204 &md_raid_disks
.attr
,
3205 &md_chunk_size
.attr
,
3207 &md_resync_start
.attr
,
3209 &md_new_device
.attr
,
3210 &md_safe_delay
.attr
,
3211 &md_array_state
.attr
,
3212 &md_reshape_position
.attr
,
3216 static struct attribute
*md_redundancy_attrs
[] = {
3218 &md_mismatches
.attr
,
3221 &md_sync_speed
.attr
,
3222 &md_sync_force_parallel
.attr
,
3223 &md_sync_completed
.attr
,
3225 &md_suspend_lo
.attr
,
3226 &md_suspend_hi
.attr
,
3231 static struct attribute_group md_redundancy_group
= {
3233 .attrs
= md_redundancy_attrs
,
3238 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3240 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3241 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3246 rv
= mddev_lock(mddev
);
3248 rv
= entry
->show(mddev
, page
);
3249 mddev_unlock(mddev
);
3255 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3256 const char *page
, size_t length
)
3258 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3259 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3264 if (!capable(CAP_SYS_ADMIN
))
3266 rv
= mddev_lock(mddev
);
3268 rv
= entry
->store(mddev
, page
, length
);
3269 mddev_unlock(mddev
);
3274 static void md_free(struct kobject
*ko
)
3276 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3280 static struct sysfs_ops md_sysfs_ops
= {
3281 .show
= md_attr_show
,
3282 .store
= md_attr_store
,
3284 static struct kobj_type md_ktype
= {
3286 .sysfs_ops
= &md_sysfs_ops
,
3287 .default_attrs
= md_default_attrs
,
3292 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3294 static DEFINE_MUTEX(disks_mutex
);
3295 mddev_t
*mddev
= mddev_find(dev
);
3296 struct gendisk
*disk
;
3297 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3298 int shift
= partitioned
? MdpMinorShift
: 0;
3299 int unit
= MINOR(dev
) >> shift
;
3305 mutex_lock(&disks_mutex
);
3306 if (mddev
->gendisk
) {
3307 mutex_unlock(&disks_mutex
);
3311 disk
= alloc_disk(1 << shift
);
3313 mutex_unlock(&disks_mutex
);
3317 disk
->major
= MAJOR(dev
);
3318 disk
->first_minor
= unit
<< shift
;
3320 sprintf(disk
->disk_name
, "md_d%d", unit
);
3322 sprintf(disk
->disk_name
, "md%d", unit
);
3323 disk
->fops
= &md_fops
;
3324 disk
->private_data
= mddev
;
3325 disk
->queue
= mddev
->queue
;
3327 mddev
->gendisk
= disk
;
3328 mutex_unlock(&disks_mutex
);
3329 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
, &disk
->dev
.kobj
,
3332 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3335 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3339 static void md_safemode_timeout(unsigned long data
)
3341 mddev_t
*mddev
= (mddev_t
*) data
;
3343 mddev
->safemode
= 1;
3344 md_wakeup_thread(mddev
->thread
);
3347 static int start_dirty_degraded
;
3349 static int do_md_run(mddev_t
* mddev
)
3353 struct list_head
*tmp
;
3355 struct gendisk
*disk
;
3356 struct mdk_personality
*pers
;
3357 char b
[BDEVNAME_SIZE
];
3359 if (list_empty(&mddev
->disks
))
3360 /* cannot run an array with no devices.. */
3367 * Analyze all RAID superblock(s)
3369 if (!mddev
->raid_disks
) {
3370 if (!mddev
->persistent
)
3375 chunk_size
= mddev
->chunk_size
;
3378 if (chunk_size
> MAX_CHUNK_SIZE
) {
3379 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3380 chunk_size
, MAX_CHUNK_SIZE
);
3384 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3386 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3387 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3390 if (chunk_size
< PAGE_SIZE
) {
3391 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3392 chunk_size
, PAGE_SIZE
);
3396 /* devices must have minimum size of one chunk */
3397 rdev_for_each(rdev
, tmp
, mddev
) {
3398 if (test_bit(Faulty
, &rdev
->flags
))
3400 if (rdev
->size
< chunk_size
/ 1024) {
3402 "md: Dev %s smaller than chunk_size:"
3404 bdevname(rdev
->bdev
,b
),
3405 (unsigned long long)rdev
->size
,
3413 if (mddev
->level
!= LEVEL_NONE
)
3414 request_module("md-level-%d", mddev
->level
);
3415 else if (mddev
->clevel
[0])
3416 request_module("md-%s", mddev
->clevel
);
3420 * Drop all container device buffers, from now on
3421 * the only valid external interface is through the md
3424 rdev_for_each(rdev
, tmp
, mddev
) {
3425 if (test_bit(Faulty
, &rdev
->flags
))
3427 sync_blockdev(rdev
->bdev
);
3428 invalidate_bdev(rdev
->bdev
);
3430 /* perform some consistency tests on the device.
3431 * We don't want the data to overlap the metadata,
3432 * Internal Bitmap issues has handled elsewhere.
3434 if (rdev
->data_offset
< rdev
->sb_offset
) {
3436 rdev
->data_offset
+ mddev
->size
*2
3437 > rdev
->sb_offset
*2) {
3438 printk("md: %s: data overlaps metadata\n",
3443 if (rdev
->sb_offset
*2 + rdev
->sb_size
/512
3444 > rdev
->data_offset
) {
3445 printk("md: %s: metadata overlaps data\n",
3452 md_probe(mddev
->unit
, NULL
, NULL
);
3453 disk
= mddev
->gendisk
;
3457 spin_lock(&pers_lock
);
3458 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3459 if (!pers
|| !try_module_get(pers
->owner
)) {
3460 spin_unlock(&pers_lock
);
3461 if (mddev
->level
!= LEVEL_NONE
)
3462 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3465 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3470 spin_unlock(&pers_lock
);
3471 mddev
->level
= pers
->level
;
3472 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3474 if (mddev
->reshape_position
!= MaxSector
&&
3475 pers
->start_reshape
== NULL
) {
3476 /* This personality cannot handle reshaping... */
3478 module_put(pers
->owner
);
3482 if (pers
->sync_request
) {
3483 /* Warn if this is a potentially silly
3486 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3488 struct list_head
*tmp2
;
3490 rdev_for_each(rdev
, tmp
, mddev
) {
3491 rdev_for_each(rdev2
, tmp2
, mddev
) {
3493 rdev
->bdev
->bd_contains
==
3494 rdev2
->bdev
->bd_contains
) {
3496 "%s: WARNING: %s appears to be"
3497 " on the same physical disk as"
3500 bdevname(rdev
->bdev
,b
),
3501 bdevname(rdev2
->bdev
,b2
));
3508 "True protection against single-disk"
3509 " failure might be compromised.\n");
3512 mddev
->recovery
= 0;
3513 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3514 mddev
->barriers_work
= 1;
3515 mddev
->ok_start_degraded
= start_dirty_degraded
;
3518 mddev
->ro
= 2; /* read-only, but switch on first write */
3520 err
= mddev
->pers
->run(mddev
);
3521 if (!err
&& mddev
->pers
->sync_request
) {
3522 err
= bitmap_create(mddev
);
3524 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3525 mdname(mddev
), err
);
3526 mddev
->pers
->stop(mddev
);
3530 printk(KERN_ERR
"md: pers->run() failed ...\n");
3531 module_put(mddev
->pers
->owner
);
3533 bitmap_destroy(mddev
);
3536 if (mddev
->pers
->sync_request
) {
3537 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3539 "md: cannot register extra attributes for %s\n",
3541 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3544 atomic_set(&mddev
->writes_pending
,0);
3545 mddev
->safemode
= 0;
3546 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3547 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3548 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3551 rdev_for_each(rdev
, tmp
, mddev
)
3552 if (rdev
->raid_disk
>= 0) {
3554 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3555 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3556 printk("md: cannot register %s for %s\n",
3560 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3563 md_update_sb(mddev
, 0);
3565 set_capacity(disk
, mddev
->array_size
<<1);
3567 /* If we call blk_queue_make_request here, it will
3568 * re-initialise max_sectors etc which may have been
3569 * refined inside -> run. So just set the bits we need to set.
3570 * Most initialisation happended when we called
3571 * blk_queue_make_request(..., md_fail_request)
3574 mddev
->queue
->queuedata
= mddev
;
3575 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3577 /* If there is a partially-recovered drive we need to
3578 * start recovery here. If we leave it to md_check_recovery,
3579 * it will remove the drives and not do the right thing
3581 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3582 struct list_head
*rtmp
;
3584 rdev_for_each(rdev
, rtmp
, mddev
)
3585 if (rdev
->raid_disk
>= 0 &&
3586 !test_bit(In_sync
, &rdev
->flags
) &&
3587 !test_bit(Faulty
, &rdev
->flags
))
3588 /* complete an interrupted recovery */
3590 if (spares
&& mddev
->pers
->sync_request
) {
3591 mddev
->recovery
= 0;
3592 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3593 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3596 if (!mddev
->sync_thread
) {
3597 printk(KERN_ERR
"%s: could not start resync"
3600 /* leave the spares where they are, it shouldn't hurt */
3601 mddev
->recovery
= 0;
3605 md_wakeup_thread(mddev
->thread
);
3606 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3609 md_new_event(mddev
);
3610 kobject_uevent(&mddev
->gendisk
->dev
.kobj
, KOBJ_CHANGE
);
3614 static int restart_array(mddev_t
*mddev
)
3616 struct gendisk
*disk
= mddev
->gendisk
;
3620 * Complain if it has no devices
3623 if (list_empty(&mddev
->disks
))
3631 mddev
->safemode
= 0;
3633 set_disk_ro(disk
, 0);
3635 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3638 * Kick recovery or resync if necessary
3640 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3641 md_wakeup_thread(mddev
->thread
);
3642 md_wakeup_thread(mddev
->sync_thread
);
3651 /* similar to deny_write_access, but accounts for our holding a reference
3652 * to the file ourselves */
3653 static int deny_bitmap_write_access(struct file
* file
)
3655 struct inode
*inode
= file
->f_mapping
->host
;
3657 spin_lock(&inode
->i_lock
);
3658 if (atomic_read(&inode
->i_writecount
) > 1) {
3659 spin_unlock(&inode
->i_lock
);
3662 atomic_set(&inode
->i_writecount
, -1);
3663 spin_unlock(&inode
->i_lock
);
3668 static void restore_bitmap_write_access(struct file
*file
)
3670 struct inode
*inode
= file
->f_mapping
->host
;
3672 spin_lock(&inode
->i_lock
);
3673 atomic_set(&inode
->i_writecount
, 1);
3674 spin_unlock(&inode
->i_lock
);
3678 * 0 - completely stop and dis-assemble array
3679 * 1 - switch to readonly
3680 * 2 - stop but do not disassemble array
3682 static int do_md_stop(mddev_t
* mddev
, int mode
)
3685 struct gendisk
*disk
= mddev
->gendisk
;
3688 if (atomic_read(&mddev
->active
)>2) {
3689 printk("md: %s still in use.\n",mdname(mddev
));
3693 if (mddev
->sync_thread
) {
3694 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3695 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3696 md_unregister_thread(mddev
->sync_thread
);
3697 mddev
->sync_thread
= NULL
;
3700 del_timer_sync(&mddev
->safemode_timer
);
3702 invalidate_partition(disk
, 0);
3705 case 1: /* readonly */
3711 case 0: /* disassemble */
3713 bitmap_flush(mddev
);
3714 md_super_wait(mddev
);
3716 set_disk_ro(disk
, 0);
3717 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3718 mddev
->pers
->stop(mddev
);
3719 mddev
->queue
->merge_bvec_fn
= NULL
;
3720 mddev
->queue
->unplug_fn
= NULL
;
3721 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3722 if (mddev
->pers
->sync_request
)
3723 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3725 module_put(mddev
->pers
->owner
);
3727 /* tell userspace to handle 'inactive' */
3728 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
3730 set_capacity(disk
, 0);
3736 if (!mddev
->in_sync
|| mddev
->flags
) {
3737 /* mark array as shutdown cleanly */
3739 md_update_sb(mddev
, 1);
3742 set_disk_ro(disk
, 1);
3743 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3747 * Free resources if final stop
3751 struct list_head
*tmp
;
3753 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3755 bitmap_destroy(mddev
);
3756 if (mddev
->bitmap_file
) {
3757 restore_bitmap_write_access(mddev
->bitmap_file
);
3758 fput(mddev
->bitmap_file
);
3759 mddev
->bitmap_file
= NULL
;
3761 mddev
->bitmap_offset
= 0;
3763 rdev_for_each(rdev
, tmp
, mddev
)
3764 if (rdev
->raid_disk
>= 0) {
3766 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3767 sysfs_remove_link(&mddev
->kobj
, nm
);
3770 /* make sure all md_delayed_delete calls have finished */
3771 flush_scheduled_work();
3773 export_array(mddev
);
3775 mddev
->array_size
= 0;
3777 mddev
->raid_disks
= 0;
3778 mddev
->recovery_cp
= 0;
3779 mddev
->resync_max
= MaxSector
;
3780 mddev
->reshape_position
= MaxSector
;
3781 mddev
->external
= 0;
3782 mddev
->persistent
= 0;
3783 mddev
->level
= LEVEL_NONE
;
3784 mddev
->clevel
[0] = 0;
3787 mddev
->metadata_type
[0] = 0;
3788 mddev
->chunk_size
= 0;
3789 mddev
->ctime
= mddev
->utime
= 0;
3791 mddev
->max_disks
= 0;
3793 mddev
->delta_disks
= 0;
3794 mddev
->new_level
= LEVEL_NONE
;
3795 mddev
->new_layout
= 0;
3796 mddev
->new_chunk
= 0;
3797 mddev
->curr_resync
= 0;
3798 mddev
->resync_mismatches
= 0;
3799 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
3800 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
3801 mddev
->recovery
= 0;
3804 mddev
->degraded
= 0;
3805 mddev
->barriers_work
= 0;
3806 mddev
->safemode
= 0;
3808 } else if (mddev
->pers
)
3809 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3812 md_new_event(mddev
);
3818 static void autorun_array(mddev_t
*mddev
)
3821 struct list_head
*tmp
;
3824 if (list_empty(&mddev
->disks
))
3827 printk(KERN_INFO
"md: running: ");
3829 rdev_for_each(rdev
, tmp
, mddev
) {
3830 char b
[BDEVNAME_SIZE
];
3831 printk("<%s>", bdevname(rdev
->bdev
,b
));
3835 err
= do_md_run (mddev
);
3837 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3838 do_md_stop (mddev
, 0);
3843 * lets try to run arrays based on all disks that have arrived
3844 * until now. (those are in pending_raid_disks)
3846 * the method: pick the first pending disk, collect all disks with
3847 * the same UUID, remove all from the pending list and put them into
3848 * the 'same_array' list. Then order this list based on superblock
3849 * update time (freshest comes first), kick out 'old' disks and
3850 * compare superblocks. If everything's fine then run it.
3852 * If "unit" is allocated, then bump its reference count
3854 static void autorun_devices(int part
)
3856 struct list_head
*tmp
;
3857 mdk_rdev_t
*rdev0
, *rdev
;
3859 char b
[BDEVNAME_SIZE
];
3861 printk(KERN_INFO
"md: autorun ...\n");
3862 while (!list_empty(&pending_raid_disks
)) {
3865 LIST_HEAD(candidates
);
3866 rdev0
= list_entry(pending_raid_disks
.next
,
3867 mdk_rdev_t
, same_set
);
3869 printk(KERN_INFO
"md: considering %s ...\n",
3870 bdevname(rdev0
->bdev
,b
));
3871 INIT_LIST_HEAD(&candidates
);
3872 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
)
3873 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3874 printk(KERN_INFO
"md: adding %s ...\n",
3875 bdevname(rdev
->bdev
,b
));
3876 list_move(&rdev
->same_set
, &candidates
);
3879 * now we have a set of devices, with all of them having
3880 * mostly sane superblocks. It's time to allocate the
3884 dev
= MKDEV(mdp_major
,
3885 rdev0
->preferred_minor
<< MdpMinorShift
);
3886 unit
= MINOR(dev
) >> MdpMinorShift
;
3888 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
3891 if (rdev0
->preferred_minor
!= unit
) {
3892 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
3893 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
3897 md_probe(dev
, NULL
, NULL
);
3898 mddev
= mddev_find(dev
);
3901 "md: cannot allocate memory for md drive.\n");
3904 if (mddev_lock(mddev
))
3905 printk(KERN_WARNING
"md: %s locked, cannot run\n",
3907 else if (mddev
->raid_disks
|| mddev
->major_version
3908 || !list_empty(&mddev
->disks
)) {
3910 "md: %s already running, cannot run %s\n",
3911 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
3912 mddev_unlock(mddev
);
3914 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
3915 mddev
->persistent
= 1;
3916 rdev_for_each_list(rdev
, tmp
, candidates
) {
3917 list_del_init(&rdev
->same_set
);
3918 if (bind_rdev_to_array(rdev
, mddev
))
3921 autorun_array(mddev
);
3922 mddev_unlock(mddev
);
3924 /* on success, candidates will be empty, on error
3927 rdev_for_each_list(rdev
, tmp
, candidates
)
3931 printk(KERN_INFO
"md: ... autorun DONE.\n");
3933 #endif /* !MODULE */
3935 static int get_version(void __user
* arg
)
3939 ver
.major
= MD_MAJOR_VERSION
;
3940 ver
.minor
= MD_MINOR_VERSION
;
3941 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3943 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3949 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3951 mdu_array_info_t info
;
3952 int nr
,working
,active
,failed
,spare
;
3954 struct list_head
*tmp
;
3956 nr
=working
=active
=failed
=spare
=0;
3957 rdev_for_each(rdev
, tmp
, mddev
) {
3959 if (test_bit(Faulty
, &rdev
->flags
))
3963 if (test_bit(In_sync
, &rdev
->flags
))
3970 info
.major_version
= mddev
->major_version
;
3971 info
.minor_version
= mddev
->minor_version
;
3972 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3973 info
.ctime
= mddev
->ctime
;
3974 info
.level
= mddev
->level
;
3975 info
.size
= mddev
->size
;
3976 if (info
.size
!= mddev
->size
) /* overflow */
3979 info
.raid_disks
= mddev
->raid_disks
;
3980 info
.md_minor
= mddev
->md_minor
;
3981 info
.not_persistent
= !mddev
->persistent
;
3983 info
.utime
= mddev
->utime
;
3986 info
.state
= (1<<MD_SB_CLEAN
);
3987 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3988 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3989 info
.active_disks
= active
;
3990 info
.working_disks
= working
;
3991 info
.failed_disks
= failed
;
3992 info
.spare_disks
= spare
;
3994 info
.layout
= mddev
->layout
;
3995 info
.chunk_size
= mddev
->chunk_size
;
3997 if (copy_to_user(arg
, &info
, sizeof(info
)))
4003 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4005 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4006 char *ptr
, *buf
= NULL
;
4009 md_allow_write(mddev
);
4011 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4015 /* bitmap disabled, zero the first byte and copy out */
4016 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4017 file
->pathname
[0] = '\0';
4021 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4025 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4029 strcpy(file
->pathname
, ptr
);
4033 if (copy_to_user(arg
, file
, sizeof(*file
)))
4041 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4043 mdu_disk_info_t info
;
4047 if (copy_from_user(&info
, arg
, sizeof(info
)))
4052 rdev
= find_rdev_nr(mddev
, nr
);
4054 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4055 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4056 info
.raid_disk
= rdev
->raid_disk
;
4058 if (test_bit(Faulty
, &rdev
->flags
))
4059 info
.state
|= (1<<MD_DISK_FAULTY
);
4060 else if (test_bit(In_sync
, &rdev
->flags
)) {
4061 info
.state
|= (1<<MD_DISK_ACTIVE
);
4062 info
.state
|= (1<<MD_DISK_SYNC
);
4064 if (test_bit(WriteMostly
, &rdev
->flags
))
4065 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4067 info
.major
= info
.minor
= 0;
4068 info
.raid_disk
= -1;
4069 info
.state
= (1<<MD_DISK_REMOVED
);
4072 if (copy_to_user(arg
, &info
, sizeof(info
)))
4078 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4080 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4082 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4084 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4087 if (!mddev
->raid_disks
) {
4089 /* expecting a device which has a superblock */
4090 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4093 "md: md_import_device returned %ld\n",
4095 return PTR_ERR(rdev
);
4097 if (!list_empty(&mddev
->disks
)) {
4098 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4099 mdk_rdev_t
, same_set
);
4100 int err
= super_types
[mddev
->major_version
]
4101 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4104 "md: %s has different UUID to %s\n",
4105 bdevname(rdev
->bdev
,b
),
4106 bdevname(rdev0
->bdev
,b2
));
4111 err
= bind_rdev_to_array(rdev
, mddev
);
4118 * add_new_disk can be used once the array is assembled
4119 * to add "hot spares". They must already have a superblock
4124 if (!mddev
->pers
->hot_add_disk
) {
4126 "%s: personality does not support diskops!\n",
4130 if (mddev
->persistent
)
4131 rdev
= md_import_device(dev
, mddev
->major_version
,
4132 mddev
->minor_version
);
4134 rdev
= md_import_device(dev
, -1, -1);
4137 "md: md_import_device returned %ld\n",
4139 return PTR_ERR(rdev
);
4141 /* set save_raid_disk if appropriate */
4142 if (!mddev
->persistent
) {
4143 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4144 info
->raid_disk
< mddev
->raid_disks
)
4145 rdev
->raid_disk
= info
->raid_disk
;
4147 rdev
->raid_disk
= -1;
4149 super_types
[mddev
->major_version
].
4150 validate_super(mddev
, rdev
);
4151 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4153 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4154 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4155 set_bit(WriteMostly
, &rdev
->flags
);
4157 rdev
->raid_disk
= -1;
4158 err
= bind_rdev_to_array(rdev
, mddev
);
4159 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4160 /* If there is hot_add_disk but no hot_remove_disk
4161 * then added disks for geometry changes,
4162 * and should be added immediately.
4164 super_types
[mddev
->major_version
].
4165 validate_super(mddev
, rdev
);
4166 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4168 unbind_rdev_from_array(rdev
);
4173 md_update_sb(mddev
, 1);
4174 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4175 md_wakeup_thread(mddev
->thread
);
4179 /* otherwise, add_new_disk is only allowed
4180 * for major_version==0 superblocks
4182 if (mddev
->major_version
!= 0) {
4183 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4188 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4190 rdev
= md_import_device (dev
, -1, 0);
4193 "md: error, md_import_device() returned %ld\n",
4195 return PTR_ERR(rdev
);
4197 rdev
->desc_nr
= info
->number
;
4198 if (info
->raid_disk
< mddev
->raid_disks
)
4199 rdev
->raid_disk
= info
->raid_disk
;
4201 rdev
->raid_disk
= -1;
4203 if (rdev
->raid_disk
< mddev
->raid_disks
)
4204 if (info
->state
& (1<<MD_DISK_SYNC
))
4205 set_bit(In_sync
, &rdev
->flags
);
4207 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4208 set_bit(WriteMostly
, &rdev
->flags
);
4210 if (!mddev
->persistent
) {
4211 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4212 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
4214 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
4215 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4217 err
= bind_rdev_to_array(rdev
, mddev
);
4227 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4229 char b
[BDEVNAME_SIZE
];
4235 rdev
= find_rdev(mddev
, dev
);
4239 if (rdev
->raid_disk
>= 0)
4242 kick_rdev_from_array(rdev
);
4243 md_update_sb(mddev
, 1);
4244 md_new_event(mddev
);
4248 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4249 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4253 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4255 char b
[BDEVNAME_SIZE
];
4263 if (mddev
->major_version
!= 0) {
4264 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4265 " version-0 superblocks.\n",
4269 if (!mddev
->pers
->hot_add_disk
) {
4271 "%s: personality does not support diskops!\n",
4276 rdev
= md_import_device (dev
, -1, 0);
4279 "md: error, md_import_device() returned %ld\n",
4284 if (mddev
->persistent
)
4285 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
4288 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
4290 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4293 if (test_bit(Faulty
, &rdev
->flags
)) {
4295 "md: can not hot-add faulty %s disk to %s!\n",
4296 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4300 clear_bit(In_sync
, &rdev
->flags
);
4302 rdev
->saved_raid_disk
= -1;
4303 err
= bind_rdev_to_array(rdev
, mddev
);
4308 * The rest should better be atomic, we can have disk failures
4309 * noticed in interrupt contexts ...
4312 if (rdev
->desc_nr
== mddev
->max_disks
) {
4313 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4316 goto abort_unbind_export
;
4319 rdev
->raid_disk
= -1;
4321 md_update_sb(mddev
, 1);
4324 * Kick recovery, maybe this spare has to be added to the
4325 * array immediately.
4327 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4328 md_wakeup_thread(mddev
->thread
);
4329 md_new_event(mddev
);
4332 abort_unbind_export
:
4333 unbind_rdev_from_array(rdev
);
4340 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4345 if (!mddev
->pers
->quiesce
)
4347 if (mddev
->recovery
|| mddev
->sync_thread
)
4349 /* we should be able to change the bitmap.. */
4355 return -EEXIST
; /* cannot add when bitmap is present */
4356 mddev
->bitmap_file
= fget(fd
);
4358 if (mddev
->bitmap_file
== NULL
) {
4359 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4364 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4366 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4368 fput(mddev
->bitmap_file
);
4369 mddev
->bitmap_file
= NULL
;
4372 mddev
->bitmap_offset
= 0; /* file overrides offset */
4373 } else if (mddev
->bitmap
== NULL
)
4374 return -ENOENT
; /* cannot remove what isn't there */
4377 mddev
->pers
->quiesce(mddev
, 1);
4379 err
= bitmap_create(mddev
);
4380 if (fd
< 0 || err
) {
4381 bitmap_destroy(mddev
);
4382 fd
= -1; /* make sure to put the file */
4384 mddev
->pers
->quiesce(mddev
, 0);
4387 if (mddev
->bitmap_file
) {
4388 restore_bitmap_write_access(mddev
->bitmap_file
);
4389 fput(mddev
->bitmap_file
);
4391 mddev
->bitmap_file
= NULL
;
4398 * set_array_info is used two different ways
4399 * The original usage is when creating a new array.
4400 * In this usage, raid_disks is > 0 and it together with
4401 * level, size, not_persistent,layout,chunksize determine the
4402 * shape of the array.
4403 * This will always create an array with a type-0.90.0 superblock.
4404 * The newer usage is when assembling an array.
4405 * In this case raid_disks will be 0, and the major_version field is
4406 * use to determine which style super-blocks are to be found on the devices.
4407 * The minor and patch _version numbers are also kept incase the
4408 * super_block handler wishes to interpret them.
4410 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4413 if (info
->raid_disks
== 0) {
4414 /* just setting version number for superblock loading */
4415 if (info
->major_version
< 0 ||
4416 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4417 super_types
[info
->major_version
].name
== NULL
) {
4418 /* maybe try to auto-load a module? */
4420 "md: superblock version %d not known\n",
4421 info
->major_version
);
4424 mddev
->major_version
= info
->major_version
;
4425 mddev
->minor_version
= info
->minor_version
;
4426 mddev
->patch_version
= info
->patch_version
;
4427 mddev
->persistent
= !info
->not_persistent
;
4430 mddev
->major_version
= MD_MAJOR_VERSION
;
4431 mddev
->minor_version
= MD_MINOR_VERSION
;
4432 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4433 mddev
->ctime
= get_seconds();
4435 mddev
->level
= info
->level
;
4436 mddev
->clevel
[0] = 0;
4437 mddev
->size
= info
->size
;
4438 mddev
->raid_disks
= info
->raid_disks
;
4439 /* don't set md_minor, it is determined by which /dev/md* was
4442 if (info
->state
& (1<<MD_SB_CLEAN
))
4443 mddev
->recovery_cp
= MaxSector
;
4445 mddev
->recovery_cp
= 0;
4446 mddev
->persistent
= ! info
->not_persistent
;
4447 mddev
->external
= 0;
4449 mddev
->layout
= info
->layout
;
4450 mddev
->chunk_size
= info
->chunk_size
;
4452 mddev
->max_disks
= MD_SB_DISKS
;
4454 if (mddev
->persistent
)
4456 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4458 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4459 mddev
->bitmap_offset
= 0;
4461 mddev
->reshape_position
= MaxSector
;
4464 * Generate a 128 bit UUID
4466 get_random_bytes(mddev
->uuid
, 16);
4468 mddev
->new_level
= mddev
->level
;
4469 mddev
->new_chunk
= mddev
->chunk_size
;
4470 mddev
->new_layout
= mddev
->layout
;
4471 mddev
->delta_disks
= 0;
4476 static int update_size(mddev_t
*mddev
, unsigned long size
)
4480 struct list_head
*tmp
;
4481 int fit
= (size
== 0);
4483 if (mddev
->pers
->resize
== NULL
)
4485 /* The "size" is the amount of each device that is used.
4486 * This can only make sense for arrays with redundancy.
4487 * linear and raid0 always use whatever space is available
4488 * We can only consider changing the size if no resync
4489 * or reconstruction is happening, and if the new size
4490 * is acceptable. It must fit before the sb_offset or,
4491 * if that is <data_offset, it must fit before the
4492 * size of each device.
4493 * If size is zero, we find the largest size that fits.
4495 if (mddev
->sync_thread
)
4497 rdev_for_each(rdev
, tmp
, mddev
) {
4499 avail
= rdev
->size
* 2;
4501 if (fit
&& (size
== 0 || size
> avail
/2))
4503 if (avail
< ((sector_t
)size
<< 1))
4506 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4508 struct block_device
*bdev
;
4510 bdev
= bdget_disk(mddev
->gendisk
, 0);
4512 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4513 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4514 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4521 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4524 /* change the number of raid disks */
4525 if (mddev
->pers
->check_reshape
== NULL
)
4527 if (raid_disks
<= 0 ||
4528 raid_disks
>= mddev
->max_disks
)
4530 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4532 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4534 rv
= mddev
->pers
->check_reshape(mddev
);
4540 * update_array_info is used to change the configuration of an
4542 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4543 * fields in the info are checked against the array.
4544 * Any differences that cannot be handled will cause an error.
4545 * Normally, only one change can be managed at a time.
4547 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4553 /* calculate expected state,ignoring low bits */
4554 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4555 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4557 if (mddev
->major_version
!= info
->major_version
||
4558 mddev
->minor_version
!= info
->minor_version
||
4559 /* mddev->patch_version != info->patch_version || */
4560 mddev
->ctime
!= info
->ctime
||
4561 mddev
->level
!= info
->level
||
4562 /* mddev->layout != info->layout || */
4563 !mddev
->persistent
!= info
->not_persistent
||
4564 mddev
->chunk_size
!= info
->chunk_size
||
4565 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4566 ((state
^info
->state
) & 0xfffffe00)
4569 /* Check there is only one change */
4570 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4571 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4572 if (mddev
->layout
!= info
->layout
) cnt
++;
4573 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4574 if (cnt
== 0) return 0;
4575 if (cnt
> 1) return -EINVAL
;
4577 if (mddev
->layout
!= info
->layout
) {
4579 * we don't need to do anything at the md level, the
4580 * personality will take care of it all.
4582 if (mddev
->pers
->reconfig
== NULL
)
4585 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4587 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4588 rv
= update_size(mddev
, info
->size
);
4590 if (mddev
->raid_disks
!= info
->raid_disks
)
4591 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4593 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4594 if (mddev
->pers
->quiesce
== NULL
)
4596 if (mddev
->recovery
|| mddev
->sync_thread
)
4598 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4599 /* add the bitmap */
4602 if (mddev
->default_bitmap_offset
== 0)
4604 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4605 mddev
->pers
->quiesce(mddev
, 1);
4606 rv
= bitmap_create(mddev
);
4608 bitmap_destroy(mddev
);
4609 mddev
->pers
->quiesce(mddev
, 0);
4611 /* remove the bitmap */
4614 if (mddev
->bitmap
->file
)
4616 mddev
->pers
->quiesce(mddev
, 1);
4617 bitmap_destroy(mddev
);
4618 mddev
->pers
->quiesce(mddev
, 0);
4619 mddev
->bitmap_offset
= 0;
4622 md_update_sb(mddev
, 1);
4626 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4630 if (mddev
->pers
== NULL
)
4633 rdev
= find_rdev(mddev
, dev
);
4637 md_error(mddev
, rdev
);
4641 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4643 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4647 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4651 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4652 unsigned int cmd
, unsigned long arg
)
4655 void __user
*argp
= (void __user
*)arg
;
4656 mddev_t
*mddev
= NULL
;
4658 if (!capable(CAP_SYS_ADMIN
))
4662 * Commands dealing with the RAID driver but not any
4668 err
= get_version(argp
);
4671 case PRINT_RAID_DEBUG
:
4679 autostart_arrays(arg
);
4686 * Commands creating/starting a new array:
4689 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4696 err
= mddev_lock(mddev
);
4699 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4706 case SET_ARRAY_INFO
:
4708 mdu_array_info_t info
;
4710 memset(&info
, 0, sizeof(info
));
4711 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4716 err
= update_array_info(mddev
, &info
);
4718 printk(KERN_WARNING
"md: couldn't update"
4719 " array info. %d\n", err
);
4724 if (!list_empty(&mddev
->disks
)) {
4726 "md: array %s already has disks!\n",
4731 if (mddev
->raid_disks
) {
4733 "md: array %s already initialised!\n",
4738 err
= set_array_info(mddev
, &info
);
4740 printk(KERN_WARNING
"md: couldn't set"
4741 " array info. %d\n", err
);
4751 * Commands querying/configuring an existing array:
4753 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4754 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4755 if ((!mddev
->raid_disks
&& !mddev
->external
)
4756 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4757 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4758 && cmd
!= GET_BITMAP_FILE
) {
4764 * Commands even a read-only array can execute:
4768 case GET_ARRAY_INFO
:
4769 err
= get_array_info(mddev
, argp
);
4772 case GET_BITMAP_FILE
:
4773 err
= get_bitmap_file(mddev
, argp
);
4777 err
= get_disk_info(mddev
, argp
);
4780 case RESTART_ARRAY_RW
:
4781 err
= restart_array(mddev
);
4785 err
= do_md_stop (mddev
, 0);
4789 err
= do_md_stop (mddev
, 1);
4793 * We have a problem here : there is no easy way to give a CHS
4794 * virtual geometry. We currently pretend that we have a 2 heads
4795 * 4 sectors (with a BIG number of cylinders...). This drives
4796 * dosfs just mad... ;-)
4801 * The remaining ioctls are changing the state of the
4802 * superblock, so we do not allow them on read-only arrays.
4803 * However non-MD ioctls (e.g. get-size) will still come through
4804 * here and hit the 'default' below, so only disallow
4805 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4807 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
4808 mddev
->ro
&& mddev
->pers
) {
4809 if (mddev
->ro
== 2) {
4811 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4812 md_wakeup_thread(mddev
->thread
);
4824 mdu_disk_info_t info
;
4825 if (copy_from_user(&info
, argp
, sizeof(info
)))
4828 err
= add_new_disk(mddev
, &info
);
4832 case HOT_REMOVE_DISK
:
4833 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4837 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4840 case SET_DISK_FAULTY
:
4841 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4845 err
= do_md_run (mddev
);
4848 case SET_BITMAP_FILE
:
4849 err
= set_bitmap_file(mddev
, (int)arg
);
4859 mddev_unlock(mddev
);
4869 static int md_open(struct inode
*inode
, struct file
*file
)
4872 * Succeed if we can lock the mddev, which confirms that
4873 * it isn't being stopped right now.
4875 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4878 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
4883 mddev_unlock(mddev
);
4885 check_disk_change(inode
->i_bdev
);
4890 static int md_release(struct inode
*inode
, struct file
* file
)
4892 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4900 static int md_media_changed(struct gendisk
*disk
)
4902 mddev_t
*mddev
= disk
->private_data
;
4904 return mddev
->changed
;
4907 static int md_revalidate(struct gendisk
*disk
)
4909 mddev_t
*mddev
= disk
->private_data
;
4914 static struct block_device_operations md_fops
=
4916 .owner
= THIS_MODULE
,
4918 .release
= md_release
,
4920 .getgeo
= md_getgeo
,
4921 .media_changed
= md_media_changed
,
4922 .revalidate_disk
= md_revalidate
,
4925 static int md_thread(void * arg
)
4927 mdk_thread_t
*thread
= arg
;
4930 * md_thread is a 'system-thread', it's priority should be very
4931 * high. We avoid resource deadlocks individually in each
4932 * raid personality. (RAID5 does preallocation) We also use RR and
4933 * the very same RT priority as kswapd, thus we will never get
4934 * into a priority inversion deadlock.
4936 * we definitely have to have equal or higher priority than
4937 * bdflush, otherwise bdflush will deadlock if there are too
4938 * many dirty RAID5 blocks.
4941 allow_signal(SIGKILL
);
4942 while (!kthread_should_stop()) {
4944 /* We need to wait INTERRUPTIBLE so that
4945 * we don't add to the load-average.
4946 * That means we need to be sure no signals are
4949 if (signal_pending(current
))
4950 flush_signals(current
);
4952 wait_event_interruptible_timeout
4954 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4955 || kthread_should_stop(),
4958 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4960 thread
->run(thread
->mddev
);
4966 void md_wakeup_thread(mdk_thread_t
*thread
)
4969 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4970 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4971 wake_up(&thread
->wqueue
);
4975 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4978 mdk_thread_t
*thread
;
4980 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4984 init_waitqueue_head(&thread
->wqueue
);
4987 thread
->mddev
= mddev
;
4988 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4989 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4990 if (IS_ERR(thread
->tsk
)) {
4997 void md_unregister_thread(mdk_thread_t
*thread
)
4999 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5001 kthread_stop(thread
->tsk
);
5005 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5012 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5015 if (mddev
->external
)
5016 set_bit(Blocked
, &rdev
->flags
);
5018 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5020 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5021 __builtin_return_address(0),__builtin_return_address(1),
5022 __builtin_return_address(2),__builtin_return_address(3));
5026 if (!mddev
->pers
->error_handler
)
5028 mddev
->pers
->error_handler(mddev
,rdev
);
5029 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5030 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5031 md_wakeup_thread(mddev
->thread
);
5032 md_new_event_inintr(mddev
);
5035 /* seq_file implementation /proc/mdstat */
5037 static void status_unused(struct seq_file
*seq
)
5041 struct list_head
*tmp
;
5043 seq_printf(seq
, "unused devices: ");
5045 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
) {
5046 char b
[BDEVNAME_SIZE
];
5048 seq_printf(seq
, "%s ",
5049 bdevname(rdev
->bdev
,b
));
5052 seq_printf(seq
, "<none>");
5054 seq_printf(seq
, "\n");
5058 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5060 sector_t max_blocks
, resync
, res
;
5061 unsigned long dt
, db
, rt
;
5063 unsigned int per_milli
;
5065 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5067 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5068 max_blocks
= mddev
->resync_max_sectors
>> 1;
5070 max_blocks
= mddev
->size
;
5073 * Should not happen.
5079 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5080 * in a sector_t, and (max_blocks>>scale) will fit in a
5081 * u32, as those are the requirements for sector_div.
5082 * Thus 'scale' must be at least 10
5085 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5086 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5089 res
= (resync
>>scale
)*1000;
5090 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5094 int i
, x
= per_milli
/50, y
= 20-x
;
5095 seq_printf(seq
, "[");
5096 for (i
= 0; i
< x
; i
++)
5097 seq_printf(seq
, "=");
5098 seq_printf(seq
, ">");
5099 for (i
= 0; i
< y
; i
++)
5100 seq_printf(seq
, ".");
5101 seq_printf(seq
, "] ");
5103 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5104 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5106 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5108 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5109 "resync" : "recovery"))),
5110 per_milli
/10, per_milli
% 10,
5111 (unsigned long long) resync
,
5112 (unsigned long long) max_blocks
);
5115 * We do not want to overflow, so the order of operands and
5116 * the * 100 / 100 trick are important. We do a +1 to be
5117 * safe against division by zero. We only estimate anyway.
5119 * dt: time from mark until now
5120 * db: blocks written from mark until now
5121 * rt: remaining time
5123 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5125 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5126 - mddev
->resync_mark_cnt
;
5127 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5129 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5131 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5134 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5136 struct list_head
*tmp
;
5146 spin_lock(&all_mddevs_lock
);
5147 list_for_each(tmp
,&all_mddevs
)
5149 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5151 spin_unlock(&all_mddevs_lock
);
5154 spin_unlock(&all_mddevs_lock
);
5156 return (void*)2;/* tail */
5160 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5162 struct list_head
*tmp
;
5163 mddev_t
*next_mddev
, *mddev
= v
;
5169 spin_lock(&all_mddevs_lock
);
5171 tmp
= all_mddevs
.next
;
5173 tmp
= mddev
->all_mddevs
.next
;
5174 if (tmp
!= &all_mddevs
)
5175 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5177 next_mddev
= (void*)2;
5180 spin_unlock(&all_mddevs_lock
);
5188 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5192 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5196 struct mdstat_info
{
5200 static int md_seq_show(struct seq_file
*seq
, void *v
)
5204 struct list_head
*tmp2
;
5206 struct mdstat_info
*mi
= seq
->private;
5207 struct bitmap
*bitmap
;
5209 if (v
== (void*)1) {
5210 struct mdk_personality
*pers
;
5211 seq_printf(seq
, "Personalities : ");
5212 spin_lock(&pers_lock
);
5213 list_for_each_entry(pers
, &pers_list
, list
)
5214 seq_printf(seq
, "[%s] ", pers
->name
);
5216 spin_unlock(&pers_lock
);
5217 seq_printf(seq
, "\n");
5218 mi
->event
= atomic_read(&md_event_count
);
5221 if (v
== (void*)2) {
5226 if (mddev_lock(mddev
) < 0)
5229 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5230 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5231 mddev
->pers
? "" : "in");
5234 seq_printf(seq
, " (read-only)");
5236 seq_printf(seq
, " (auto-read-only)");
5237 seq_printf(seq
, " %s", mddev
->pers
->name
);
5241 rdev_for_each(rdev
, tmp2
, mddev
) {
5242 char b
[BDEVNAME_SIZE
];
5243 seq_printf(seq
, " %s[%d]",
5244 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5245 if (test_bit(WriteMostly
, &rdev
->flags
))
5246 seq_printf(seq
, "(W)");
5247 if (test_bit(Faulty
, &rdev
->flags
)) {
5248 seq_printf(seq
, "(F)");
5250 } else if (rdev
->raid_disk
< 0)
5251 seq_printf(seq
, "(S)"); /* spare */
5255 if (!list_empty(&mddev
->disks
)) {
5257 seq_printf(seq
, "\n %llu blocks",
5258 (unsigned long long)mddev
->array_size
);
5260 seq_printf(seq
, "\n %llu blocks",
5261 (unsigned long long)size
);
5263 if (mddev
->persistent
) {
5264 if (mddev
->major_version
!= 0 ||
5265 mddev
->minor_version
!= 90) {
5266 seq_printf(seq
," super %d.%d",
5267 mddev
->major_version
,
5268 mddev
->minor_version
);
5270 } else if (mddev
->external
)
5271 seq_printf(seq
, " super external:%s",
5272 mddev
->metadata_type
);
5274 seq_printf(seq
, " super non-persistent");
5277 mddev
->pers
->status (seq
, mddev
);
5278 seq_printf(seq
, "\n ");
5279 if (mddev
->pers
->sync_request
) {
5280 if (mddev
->curr_resync
> 2) {
5281 status_resync (seq
, mddev
);
5282 seq_printf(seq
, "\n ");
5283 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5284 seq_printf(seq
, "\tresync=DELAYED\n ");
5285 else if (mddev
->recovery_cp
< MaxSector
)
5286 seq_printf(seq
, "\tresync=PENDING\n ");
5289 seq_printf(seq
, "\n ");
5291 if ((bitmap
= mddev
->bitmap
)) {
5292 unsigned long chunk_kb
;
5293 unsigned long flags
;
5294 spin_lock_irqsave(&bitmap
->lock
, flags
);
5295 chunk_kb
= bitmap
->chunksize
>> 10;
5296 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5298 bitmap
->pages
- bitmap
->missing_pages
,
5300 (bitmap
->pages
- bitmap
->missing_pages
)
5301 << (PAGE_SHIFT
- 10),
5302 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5303 chunk_kb
? "KB" : "B");
5305 seq_printf(seq
, ", file: ");
5306 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5309 seq_printf(seq
, "\n");
5310 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5313 seq_printf(seq
, "\n");
5315 mddev_unlock(mddev
);
5320 static struct seq_operations md_seq_ops
= {
5321 .start
= md_seq_start
,
5322 .next
= md_seq_next
,
5323 .stop
= md_seq_stop
,
5324 .show
= md_seq_show
,
5327 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5330 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5334 error
= seq_open(file
, &md_seq_ops
);
5338 struct seq_file
*p
= file
->private_data
;
5340 mi
->event
= atomic_read(&md_event_count
);
5345 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5347 struct seq_file
*m
= filp
->private_data
;
5348 struct mdstat_info
*mi
= m
->private;
5351 poll_wait(filp
, &md_event_waiters
, wait
);
5353 /* always allow read */
5354 mask
= POLLIN
| POLLRDNORM
;
5356 if (mi
->event
!= atomic_read(&md_event_count
))
5357 mask
|= POLLERR
| POLLPRI
;
5361 static const struct file_operations md_seq_fops
= {
5362 .owner
= THIS_MODULE
,
5363 .open
= md_seq_open
,
5365 .llseek
= seq_lseek
,
5366 .release
= seq_release_private
,
5367 .poll
= mdstat_poll
,
5370 int register_md_personality(struct mdk_personality
*p
)
5372 spin_lock(&pers_lock
);
5373 list_add_tail(&p
->list
, &pers_list
);
5374 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5375 spin_unlock(&pers_lock
);
5379 int unregister_md_personality(struct mdk_personality
*p
)
5381 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5382 spin_lock(&pers_lock
);
5383 list_del_init(&p
->list
);
5384 spin_unlock(&pers_lock
);
5388 static int is_mddev_idle(mddev_t
*mddev
)
5391 struct list_head
*tmp
;
5396 rdev_for_each(rdev
, tmp
, mddev
) {
5397 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5398 curr_events
= disk_stat_read(disk
, sectors
[0]) +
5399 disk_stat_read(disk
, sectors
[1]) -
5400 atomic_read(&disk
->sync_io
);
5401 /* sync IO will cause sync_io to increase before the disk_stats
5402 * as sync_io is counted when a request starts, and
5403 * disk_stats is counted when it completes.
5404 * So resync activity will cause curr_events to be smaller than
5405 * when there was no such activity.
5406 * non-sync IO will cause disk_stat to increase without
5407 * increasing sync_io so curr_events will (eventually)
5408 * be larger than it was before. Once it becomes
5409 * substantially larger, the test below will cause
5410 * the array to appear non-idle, and resync will slow
5412 * If there is a lot of outstanding resync activity when
5413 * we set last_event to curr_events, then all that activity
5414 * completing might cause the array to appear non-idle
5415 * and resync will be slowed down even though there might
5416 * not have been non-resync activity. This will only
5417 * happen once though. 'last_events' will soon reflect
5418 * the state where there is little or no outstanding
5419 * resync requests, and further resync activity will
5420 * always make curr_events less than last_events.
5423 if (curr_events
- rdev
->last_events
> 4096) {
5424 rdev
->last_events
= curr_events
;
5431 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5433 /* another "blocks" (512byte) blocks have been synced */
5434 atomic_sub(blocks
, &mddev
->recovery_active
);
5435 wake_up(&mddev
->recovery_wait
);
5437 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5438 md_wakeup_thread(mddev
->thread
);
5439 // stop recovery, signal do_sync ....
5444 /* md_write_start(mddev, bi)
5445 * If we need to update some array metadata (e.g. 'active' flag
5446 * in superblock) before writing, schedule a superblock update
5447 * and wait for it to complete.
5449 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5451 if (bio_data_dir(bi
) != WRITE
)
5454 BUG_ON(mddev
->ro
== 1);
5455 if (mddev
->ro
== 2) {
5456 /* need to switch to read/write */
5458 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5459 md_wakeup_thread(mddev
->thread
);
5460 md_wakeup_thread(mddev
->sync_thread
);
5462 atomic_inc(&mddev
->writes_pending
);
5463 if (mddev
->safemode
== 1)
5464 mddev
->safemode
= 0;
5465 if (mddev
->in_sync
) {
5466 spin_lock_irq(&mddev
->write_lock
);
5467 if (mddev
->in_sync
) {
5469 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5470 md_wakeup_thread(mddev
->thread
);
5472 spin_unlock_irq(&mddev
->write_lock
);
5473 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5475 wait_event(mddev
->sb_wait
,
5476 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5477 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5480 void md_write_end(mddev_t
*mddev
)
5482 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5483 if (mddev
->safemode
== 2)
5484 md_wakeup_thread(mddev
->thread
);
5485 else if (mddev
->safemode_delay
)
5486 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5490 /* md_allow_write(mddev)
5491 * Calling this ensures that the array is marked 'active' so that writes
5492 * may proceed without blocking. It is important to call this before
5493 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5494 * Must be called with mddev_lock held.
5496 void md_allow_write(mddev_t
*mddev
)
5503 spin_lock_irq(&mddev
->write_lock
);
5504 if (mddev
->in_sync
) {
5506 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5507 if (mddev
->safemode_delay
&&
5508 mddev
->safemode
== 0)
5509 mddev
->safemode
= 1;
5510 spin_unlock_irq(&mddev
->write_lock
);
5511 md_update_sb(mddev
, 0);
5513 sysfs_notify(&mddev
->kobj
, NULL
, "array_state");
5514 /* wait for the dirty state to be recorded in the metadata */
5515 wait_event(mddev
->sb_wait
,
5516 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5517 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5519 spin_unlock_irq(&mddev
->write_lock
);
5521 EXPORT_SYMBOL_GPL(md_allow_write
);
5523 #define SYNC_MARKS 10
5524 #define SYNC_MARK_STEP (3*HZ)
5525 void md_do_sync(mddev_t
*mddev
)
5528 unsigned int currspeed
= 0,
5530 sector_t max_sectors
,j
, io_sectors
;
5531 unsigned long mark
[SYNC_MARKS
];
5532 sector_t mark_cnt
[SYNC_MARKS
];
5534 struct list_head
*tmp
;
5535 sector_t last_check
;
5537 struct list_head
*rtmp
;
5541 /* just incase thread restarts... */
5542 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5544 if (mddev
->ro
) /* never try to sync a read-only array */
5547 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5548 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5549 desc
= "data-check";
5550 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5551 desc
= "requested-resync";
5554 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5559 /* we overload curr_resync somewhat here.
5560 * 0 == not engaged in resync at all
5561 * 2 == checking that there is no conflict with another sync
5562 * 1 == like 2, but have yielded to allow conflicting resync to
5564 * other == active in resync - this many blocks
5566 * Before starting a resync we must have set curr_resync to
5567 * 2, and then checked that every "conflicting" array has curr_resync
5568 * less than ours. When we find one that is the same or higher
5569 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5570 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5571 * This will mean we have to start checking from the beginning again.
5576 mddev
->curr_resync
= 2;
5579 if (kthread_should_stop()) {
5580 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5583 for_each_mddev(mddev2
, tmp
) {
5584 if (mddev2
== mddev
)
5586 if (!mddev
->parallel_resync
5587 && mddev2
->curr_resync
5588 && match_mddev_units(mddev
, mddev2
)) {
5590 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5591 /* arbitrarily yield */
5592 mddev
->curr_resync
= 1;
5593 wake_up(&resync_wait
);
5595 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5596 /* no need to wait here, we can wait the next
5597 * time 'round when curr_resync == 2
5600 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5601 if (!kthread_should_stop() &&
5602 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5603 printk(KERN_INFO
"md: delaying %s of %s"
5604 " until %s has finished (they"
5605 " share one or more physical units)\n",
5606 desc
, mdname(mddev
), mdname(mddev2
));
5609 finish_wait(&resync_wait
, &wq
);
5612 finish_wait(&resync_wait
, &wq
);
5615 } while (mddev
->curr_resync
< 2);
5618 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5619 /* resync follows the size requested by the personality,
5620 * which defaults to physical size, but can be virtual size
5622 max_sectors
= mddev
->resync_max_sectors
;
5623 mddev
->resync_mismatches
= 0;
5624 /* we don't use the checkpoint if there's a bitmap */
5625 if (!mddev
->bitmap
&&
5626 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5627 j
= mddev
->recovery_cp
;
5628 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5629 max_sectors
= mddev
->size
<< 1;
5631 /* recovery follows the physical size of devices */
5632 max_sectors
= mddev
->size
<< 1;
5634 rdev_for_each(rdev
, rtmp
, mddev
)
5635 if (rdev
->raid_disk
>= 0 &&
5636 !test_bit(Faulty
, &rdev
->flags
) &&
5637 !test_bit(In_sync
, &rdev
->flags
) &&
5638 rdev
->recovery_offset
< j
)
5639 j
= rdev
->recovery_offset
;
5642 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5643 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5644 " %d KB/sec/disk.\n", speed_min(mddev
));
5645 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5646 "(but not more than %d KB/sec) for %s.\n",
5647 speed_max(mddev
), desc
);
5649 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5652 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5654 mark_cnt
[m
] = io_sectors
;
5657 mddev
->resync_mark
= mark
[last_mark
];
5658 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5661 * Tune reconstruction:
5663 window
= 32*(PAGE_SIZE
/512);
5664 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5665 window
/2,(unsigned long long) max_sectors
/2);
5667 atomic_set(&mddev
->recovery_active
, 0);
5668 init_waitqueue_head(&mddev
->recovery_wait
);
5673 "md: resuming %s of %s from checkpoint.\n",
5674 desc
, mdname(mddev
));
5675 mddev
->curr_resync
= j
;
5678 while (j
< max_sectors
) {
5682 if (j
>= mddev
->resync_max
) {
5683 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5684 wait_event(mddev
->recovery_wait
,
5685 mddev
->resync_max
> j
5686 || kthread_should_stop());
5688 if (kthread_should_stop())
5690 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5691 currspeed
< speed_min(mddev
));
5693 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5697 if (!skipped
) { /* actual IO requested */
5698 io_sectors
+= sectors
;
5699 atomic_add(sectors
, &mddev
->recovery_active
);
5703 if (j
>1) mddev
->curr_resync
= j
;
5704 mddev
->curr_mark_cnt
= io_sectors
;
5705 if (last_check
== 0)
5706 /* this is the earliers that rebuilt will be
5707 * visible in /proc/mdstat
5709 md_new_event(mddev
);
5711 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5714 last_check
= io_sectors
;
5716 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5720 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5722 int next
= (last_mark
+1) % SYNC_MARKS
;
5724 mddev
->resync_mark
= mark
[next
];
5725 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5726 mark
[next
] = jiffies
;
5727 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5732 if (kthread_should_stop())
5737 * this loop exits only if either when we are slower than
5738 * the 'hard' speed limit, or the system was IO-idle for
5740 * the system might be non-idle CPU-wise, but we only care
5741 * about not overloading the IO subsystem. (things like an
5742 * e2fsck being done on the RAID array should execute fast)
5744 blk_unplug(mddev
->queue
);
5747 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5748 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5750 if (currspeed
> speed_min(mddev
)) {
5751 if ((currspeed
> speed_max(mddev
)) ||
5752 !is_mddev_idle(mddev
)) {
5758 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5760 * this also signals 'finished resyncing' to md_stop
5763 blk_unplug(mddev
->queue
);
5765 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5767 /* tell personality that we are finished */
5768 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5770 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5771 mddev
->curr_resync
> 2) {
5772 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5773 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5774 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5776 "md: checkpointing %s of %s.\n",
5777 desc
, mdname(mddev
));
5778 mddev
->recovery_cp
= mddev
->curr_resync
;
5781 mddev
->recovery_cp
= MaxSector
;
5783 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5784 mddev
->curr_resync
= MaxSector
;
5785 rdev_for_each(rdev
, rtmp
, mddev
)
5786 if (rdev
->raid_disk
>= 0 &&
5787 !test_bit(Faulty
, &rdev
->flags
) &&
5788 !test_bit(In_sync
, &rdev
->flags
) &&
5789 rdev
->recovery_offset
< mddev
->curr_resync
)
5790 rdev
->recovery_offset
= mddev
->curr_resync
;
5793 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5796 mddev
->curr_resync
= 0;
5797 mddev
->resync_max
= MaxSector
;
5798 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5799 wake_up(&resync_wait
);
5800 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5801 md_wakeup_thread(mddev
->thread
);
5806 * got a signal, exit.
5809 "md: md_do_sync() got signal ... exiting\n");
5810 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5814 EXPORT_SYMBOL_GPL(md_do_sync
);
5817 static int remove_and_add_spares(mddev_t
*mddev
)
5820 struct list_head
*rtmp
;
5823 rdev_for_each(rdev
, rtmp
, mddev
)
5824 if (rdev
->raid_disk
>= 0 &&
5825 !test_bit(Blocked
, &rdev
->flags
) &&
5826 (test_bit(Faulty
, &rdev
->flags
) ||
5827 ! test_bit(In_sync
, &rdev
->flags
)) &&
5828 atomic_read(&rdev
->nr_pending
)==0) {
5829 if (mddev
->pers
->hot_remove_disk(
5830 mddev
, rdev
->raid_disk
)==0) {
5832 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5833 sysfs_remove_link(&mddev
->kobj
, nm
);
5834 rdev
->raid_disk
= -1;
5838 if (mddev
->degraded
) {
5839 rdev_for_each(rdev
, rtmp
, mddev
) {
5840 if (rdev
->raid_disk
>= 0 &&
5841 !test_bit(In_sync
, &rdev
->flags
))
5843 if (rdev
->raid_disk
< 0
5844 && !test_bit(Faulty
, &rdev
->flags
)) {
5845 rdev
->recovery_offset
= 0;
5846 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
5848 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5849 if (sysfs_create_link(&mddev
->kobj
,
5852 "md: cannot register "
5856 md_new_event(mddev
);
5865 * This routine is regularly called by all per-raid-array threads to
5866 * deal with generic issues like resync and super-block update.
5867 * Raid personalities that don't have a thread (linear/raid0) do not
5868 * need this as they never do any recovery or update the superblock.
5870 * It does not do any resync itself, but rather "forks" off other threads
5871 * to do that as needed.
5872 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5873 * "->recovery" and create a thread at ->sync_thread.
5874 * When the thread finishes it sets MD_RECOVERY_DONE
5875 * and wakeups up this thread which will reap the thread and finish up.
5876 * This thread also removes any faulty devices (with nr_pending == 0).
5878 * The overall approach is:
5879 * 1/ if the superblock needs updating, update it.
5880 * 2/ If a recovery thread is running, don't do anything else.
5881 * 3/ If recovery has finished, clean up, possibly marking spares active.
5882 * 4/ If there are any faulty devices, remove them.
5883 * 5/ If array is degraded, try to add spares devices
5884 * 6/ If array has spares or is not in-sync, start a resync thread.
5886 void md_check_recovery(mddev_t
*mddev
)
5889 struct list_head
*rtmp
;
5893 bitmap_daemon_work(mddev
->bitmap
);
5898 if (signal_pending(current
)) {
5899 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
5900 printk(KERN_INFO
"md: %s in immediate safe mode\n",
5902 mddev
->safemode
= 2;
5904 flush_signals(current
);
5908 (mddev
->flags
&& !mddev
->external
) ||
5909 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
5910 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
5911 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
5912 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
5913 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
5917 if (mddev_trylock(mddev
)) {
5920 if (!mddev
->external
) {
5921 spin_lock_irq(&mddev
->write_lock
);
5922 if (mddev
->safemode
&&
5923 !atomic_read(&mddev
->writes_pending
) &&
5925 mddev
->recovery_cp
== MaxSector
) {
5927 if (mddev
->persistent
)
5928 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5930 if (mddev
->safemode
== 1)
5931 mddev
->safemode
= 0;
5932 spin_unlock_irq(&mddev
->write_lock
);
5936 md_update_sb(mddev
, 0);
5939 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
5940 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
5941 /* resync/recovery still happening */
5942 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5945 if (mddev
->sync_thread
) {
5946 /* resync has finished, collect result */
5947 md_unregister_thread(mddev
->sync_thread
);
5948 mddev
->sync_thread
= NULL
;
5949 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5951 /* activate any spares */
5952 mddev
->pers
->spare_active(mddev
);
5954 md_update_sb(mddev
, 1);
5956 /* if array is no-longer degraded, then any saved_raid_disk
5957 * information must be scrapped
5959 if (!mddev
->degraded
)
5960 rdev_for_each(rdev
, rtmp
, mddev
)
5961 rdev
->saved_raid_disk
= -1;
5963 mddev
->recovery
= 0;
5964 /* flag recovery needed just to double check */
5965 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5966 md_new_event(mddev
);
5969 /* Clear some bits that don't mean anything, but
5972 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5973 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5974 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5976 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
5978 /* no recovery is running.
5979 * remove any failed drives, then
5980 * add spares if possible.
5981 * Spare are also removed and re-added, to allow
5982 * the personality to fail the re-add.
5985 if (mddev
->reshape_position
!= MaxSector
) {
5986 if (mddev
->pers
->check_reshape(mddev
) != 0)
5987 /* Cannot proceed */
5989 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
5990 } else if ((spares
= remove_and_add_spares(mddev
))) {
5991 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5992 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
5993 } else if (mddev
->recovery_cp
< MaxSector
) {
5994 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5995 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5996 /* nothing to be done ... */
5999 if (mddev
->pers
->sync_request
) {
6000 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6001 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6002 /* We are adding a device or devices to an array
6003 * which has the bitmap stored on all devices.
6004 * So make sure all bitmap pages get written
6006 bitmap_write_all(mddev
->bitmap
);
6008 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6011 if (!mddev
->sync_thread
) {
6012 printk(KERN_ERR
"%s: could not start resync"
6015 /* leave the spares where they are, it shouldn't hurt */
6016 mddev
->recovery
= 0;
6018 md_wakeup_thread(mddev
->sync_thread
);
6019 md_new_event(mddev
);
6022 mddev_unlock(mddev
);
6026 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6028 sysfs_notify(&rdev
->kobj
, NULL
, "state");
6029 wait_event_timeout(rdev
->blocked_wait
,
6030 !test_bit(Blocked
, &rdev
->flags
),
6031 msecs_to_jiffies(5000));
6032 rdev_dec_pending(rdev
, mddev
);
6034 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6036 static int md_notify_reboot(struct notifier_block
*this,
6037 unsigned long code
, void *x
)
6039 struct list_head
*tmp
;
6042 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6044 printk(KERN_INFO
"md: stopping all md devices.\n");
6046 for_each_mddev(mddev
, tmp
)
6047 if (mddev_trylock(mddev
)) {
6048 do_md_stop (mddev
, 1);
6049 mddev_unlock(mddev
);
6052 * certain more exotic SCSI devices are known to be
6053 * volatile wrt too early system reboots. While the
6054 * right place to handle this issue is the given
6055 * driver, we do want to have a safe RAID driver ...
6062 static struct notifier_block md_notifier
= {
6063 .notifier_call
= md_notify_reboot
,
6065 .priority
= INT_MAX
, /* before any real devices */
6068 static void md_geninit(void)
6070 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6072 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6075 static int __init
md_init(void)
6077 if (register_blkdev(MAJOR_NR
, "md"))
6079 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6080 unregister_blkdev(MAJOR_NR
, "md");
6083 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6084 md_probe
, NULL
, NULL
);
6085 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6086 md_probe
, NULL
, NULL
);
6088 register_reboot_notifier(&md_notifier
);
6089 raid_table_header
= register_sysctl_table(raid_root_table
);
6099 * Searches all registered partitions for autorun RAID arrays
6103 static LIST_HEAD(all_detected_devices
);
6104 struct detected_devices_node
{
6105 struct list_head list
;
6109 void md_autodetect_dev(dev_t dev
)
6111 struct detected_devices_node
*node_detected_dev
;
6113 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6114 if (node_detected_dev
) {
6115 node_detected_dev
->dev
= dev
;
6116 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6118 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6119 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6124 static void autostart_arrays(int part
)
6127 struct detected_devices_node
*node_detected_dev
;
6129 int i_scanned
, i_passed
;
6134 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6136 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6138 node_detected_dev
= list_entry(all_detected_devices
.next
,
6139 struct detected_devices_node
, list
);
6140 list_del(&node_detected_dev
->list
);
6141 dev
= node_detected_dev
->dev
;
6142 kfree(node_detected_dev
);
6143 rdev
= md_import_device(dev
,0, 90);
6147 if (test_bit(Faulty
, &rdev
->flags
)) {
6151 set_bit(AutoDetected
, &rdev
->flags
);
6152 list_add(&rdev
->same_set
, &pending_raid_disks
);
6156 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6157 i_scanned
, i_passed
);
6159 autorun_devices(part
);
6162 #endif /* !MODULE */
6164 static __exit
void md_exit(void)
6167 struct list_head
*tmp
;
6169 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6170 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6172 unregister_blkdev(MAJOR_NR
,"md");
6173 unregister_blkdev(mdp_major
, "mdp");
6174 unregister_reboot_notifier(&md_notifier
);
6175 unregister_sysctl_table(raid_table_header
);
6176 remove_proc_entry("mdstat", NULL
);
6177 for_each_mddev(mddev
, tmp
) {
6178 struct gendisk
*disk
= mddev
->gendisk
;
6181 export_array(mddev
);
6184 mddev
->gendisk
= NULL
;
6189 subsys_initcall(md_init
);
6190 module_exit(md_exit
)
6192 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6194 return sprintf(buffer
, "%d", start_readonly
);
6196 static int set_ro(const char *val
, struct kernel_param
*kp
)
6199 int num
= simple_strtoul(val
, &e
, 10);
6200 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6201 start_readonly
= num
;
6207 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6208 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6211 EXPORT_SYMBOL(register_md_personality
);
6212 EXPORT_SYMBOL(unregister_md_personality
);
6213 EXPORT_SYMBOL(md_error
);
6214 EXPORT_SYMBOL(md_done_sync
);
6215 EXPORT_SYMBOL(md_write_start
);
6216 EXPORT_SYMBOL(md_write_end
);
6217 EXPORT_SYMBOL(md_register_thread
);
6218 EXPORT_SYMBOL(md_unregister_thread
);
6219 EXPORT_SYMBOL(md_wakeup_thread
);
6220 EXPORT_SYMBOL(md_check_recovery
);
6221 MODULE_LICENSE("GPL");
6223 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);