2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part
);
72 static LIST_HEAD(pers_list
);
73 static DEFINE_SPINLOCK(pers_lock
);
75 static void md_print_devices(void);
77 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min
= 1000;
93 static int sysctl_speed_limit_max
= 200000;
94 static inline int speed_min(mddev_t
*mddev
)
96 return mddev
->sync_speed_min
?
97 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
100 static inline int speed_max(mddev_t
*mddev
)
102 return mddev
->sync_speed_max
?
103 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
106 static struct ctl_table_header
*raid_table_header
;
108 static ctl_table raid_table
[] = {
110 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
111 .procname
= "speed_limit_min",
112 .data
= &sysctl_speed_limit_min
,
113 .maxlen
= sizeof(int),
114 .mode
= S_IRUGO
|S_IWUSR
,
115 .proc_handler
= &proc_dointvec
,
118 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
119 .procname
= "speed_limit_max",
120 .data
= &sysctl_speed_limit_max
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= &proc_dointvec
,
128 static ctl_table raid_dir_table
[] = {
130 .ctl_name
= DEV_RAID
,
133 .mode
= S_IRUGO
|S_IXUGO
,
139 static ctl_table raid_root_table
[] = {
145 .child
= raid_dir_table
,
150 static struct block_device_operations md_fops
;
152 static int start_readonly
;
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
164 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
165 static atomic_t md_event_count
;
166 void md_new_event(mddev_t
*mddev
)
168 atomic_inc(&md_event_count
);
169 wake_up(&md_event_waiters
);
170 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
172 EXPORT_SYMBOL_GPL(md_new_event
);
174 /* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
177 static void md_new_event_inintr(mddev_t
*mddev
)
179 atomic_inc(&md_event_count
);
180 wake_up(&md_event_waiters
);
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
187 static LIST_HEAD(all_mddevs
);
188 static DEFINE_SPINLOCK(all_mddevs_lock
);
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
198 #define for_each_mddev(mddev,tmp) \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
214 static int md_fail_request (struct request_queue
*q
, struct bio
*bio
)
220 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
222 atomic_inc(&mddev
->active
);
226 static void mddev_put(mddev_t
*mddev
)
228 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
230 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
231 list_del(&mddev
->all_mddevs
);
232 spin_unlock(&all_mddevs_lock
);
233 blk_cleanup_queue(mddev
->queue
);
234 kobject_put(&mddev
->kobj
);
236 spin_unlock(&all_mddevs_lock
);
239 static mddev_t
* mddev_find(dev_t unit
)
241 mddev_t
*mddev
, *new = NULL
;
244 spin_lock(&all_mddevs_lock
);
245 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
246 if (mddev
->unit
== unit
) {
248 spin_unlock(&all_mddevs_lock
);
254 list_add(&new->all_mddevs
, &all_mddevs
);
255 spin_unlock(&all_mddevs_lock
);
258 spin_unlock(&all_mddevs_lock
);
260 new = kzalloc(sizeof(*new), GFP_KERNEL
);
265 if (MAJOR(unit
) == MD_MAJOR
)
266 new->md_minor
= MINOR(unit
);
268 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
270 mutex_init(&new->reconfig_mutex
);
271 INIT_LIST_HEAD(&new->disks
);
272 INIT_LIST_HEAD(&new->all_mddevs
);
273 init_timer(&new->safemode_timer
);
274 atomic_set(&new->active
, 1);
275 spin_lock_init(&new->write_lock
);
276 init_waitqueue_head(&new->sb_wait
);
277 new->reshape_position
= MaxSector
;
278 new->resync_max
= MaxSector
;
279 new->level
= LEVEL_NONE
;
281 new->queue
= blk_alloc_queue(GFP_KERNEL
);
286 /* Can be unlocked because the queue is new: no concurrency */
287 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, new->queue
);
289 blk_queue_make_request(new->queue
, md_fail_request
);
294 static inline int mddev_lock(mddev_t
* mddev
)
296 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
299 static inline int mddev_trylock(mddev_t
* mddev
)
301 return mutex_trylock(&mddev
->reconfig_mutex
);
304 static inline void mddev_unlock(mddev_t
* mddev
)
306 mutex_unlock(&mddev
->reconfig_mutex
);
308 md_wakeup_thread(mddev
->thread
);
311 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
314 struct list_head
*tmp
;
316 rdev_for_each(rdev
, tmp
, mddev
) {
317 if (rdev
->desc_nr
== nr
)
323 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
325 struct list_head
*tmp
;
328 rdev_for_each(rdev
, tmp
, mddev
) {
329 if (rdev
->bdev
->bd_dev
== dev
)
335 static struct mdk_personality
*find_pers(int level
, char *clevel
)
337 struct mdk_personality
*pers
;
338 list_for_each_entry(pers
, &pers_list
, list
) {
339 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
341 if (strcmp(pers
->name
, clevel
)==0)
347 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
349 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
350 return MD_NEW_SIZE_BLOCKS(size
);
353 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
357 size
= rdev
->sb_offset
;
360 size
&= ~((sector_t
)chunk_size
/1024 - 1);
364 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
369 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
370 if (!rdev
->sb_page
) {
371 printk(KERN_ALERT
"md: out of memory.\n");
378 static void free_disk_sb(mdk_rdev_t
* rdev
)
381 put_page(rdev
->sb_page
);
383 rdev
->sb_page
= NULL
;
390 static void super_written(struct bio
*bio
, int error
)
392 mdk_rdev_t
*rdev
= bio
->bi_private
;
393 mddev_t
*mddev
= rdev
->mddev
;
395 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
396 printk("md: super_written gets error=%d, uptodate=%d\n",
397 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
398 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
399 md_error(mddev
, rdev
);
402 if (atomic_dec_and_test(&mddev
->pending_writes
))
403 wake_up(&mddev
->sb_wait
);
407 static void super_written_barrier(struct bio
*bio
, int error
)
409 struct bio
*bio2
= bio
->bi_private
;
410 mdk_rdev_t
*rdev
= bio2
->bi_private
;
411 mddev_t
*mddev
= rdev
->mddev
;
413 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
414 error
== -EOPNOTSUPP
) {
416 /* barriers don't appear to be supported :-( */
417 set_bit(BarriersNotsupp
, &rdev
->flags
);
418 mddev
->barriers_work
= 0;
419 spin_lock_irqsave(&mddev
->write_lock
, flags
);
420 bio2
->bi_next
= mddev
->biolist
;
421 mddev
->biolist
= bio2
;
422 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
423 wake_up(&mddev
->sb_wait
);
427 bio
->bi_private
= rdev
;
428 super_written(bio
, error
);
432 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
433 sector_t sector
, int size
, struct page
*page
)
435 /* write first size bytes of page to sector of rdev
436 * Increment mddev->pending_writes before returning
437 * and decrement it on completion, waking up sb_wait
438 * if zero is reached.
439 * If an error occurred, call md_error
441 * As we might need to resubmit the request if BIO_RW_BARRIER
442 * causes ENOTSUPP, we allocate a spare bio...
444 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
445 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
447 bio
->bi_bdev
= rdev
->bdev
;
448 bio
->bi_sector
= sector
;
449 bio_add_page(bio
, page
, size
, 0);
450 bio
->bi_private
= rdev
;
451 bio
->bi_end_io
= super_written
;
454 atomic_inc(&mddev
->pending_writes
);
455 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
457 rw
|= (1<<BIO_RW_BARRIER
);
458 rbio
= bio_clone(bio
, GFP_NOIO
);
459 rbio
->bi_private
= bio
;
460 rbio
->bi_end_io
= super_written_barrier
;
461 submit_bio(rw
, rbio
);
466 void md_super_wait(mddev_t
*mddev
)
468 /* wait for all superblock writes that were scheduled to complete.
469 * if any had to be retried (due to BARRIER problems), retry them
473 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
474 if (atomic_read(&mddev
->pending_writes
)==0)
476 while (mddev
->biolist
) {
478 spin_lock_irq(&mddev
->write_lock
);
479 bio
= mddev
->biolist
;
480 mddev
->biolist
= bio
->bi_next
;
482 spin_unlock_irq(&mddev
->write_lock
);
483 submit_bio(bio
->bi_rw
, bio
);
487 finish_wait(&mddev
->sb_wait
, &wq
);
490 static void bi_complete(struct bio
*bio
, int error
)
492 complete((struct completion
*)bio
->bi_private
);
495 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
496 struct page
*page
, int rw
)
498 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
499 struct completion event
;
502 rw
|= (1 << BIO_RW_SYNC
);
505 bio
->bi_sector
= sector
;
506 bio_add_page(bio
, page
, size
, 0);
507 init_completion(&event
);
508 bio
->bi_private
= &event
;
509 bio
->bi_end_io
= bi_complete
;
511 wait_for_completion(&event
);
513 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
517 EXPORT_SYMBOL_GPL(sync_page_io
);
519 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
521 char b
[BDEVNAME_SIZE
];
522 if (!rdev
->sb_page
) {
530 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
536 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
537 bdevname(rdev
->bdev
,b
));
541 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
543 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
544 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
545 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
546 (sb1
->set_uuid3
== sb2
->set_uuid3
))
554 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
557 mdp_super_t
*tmp1
, *tmp2
;
559 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
560 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
562 if (!tmp1
|| !tmp2
) {
564 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
572 * nr_disks is not constant
577 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
589 static u32
md_csum_fold(u32 csum
)
591 csum
= (csum
& 0xffff) + (csum
>> 16);
592 return (csum
& 0xffff) + (csum
>> 16);
595 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
598 u32
*sb32
= (u32
*)sb
;
600 unsigned int disk_csum
, csum
;
602 disk_csum
= sb
->sb_csum
;
605 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
607 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
611 /* This used to use csum_partial, which was wrong for several
612 * reasons including that different results are returned on
613 * different architectures. It isn't critical that we get exactly
614 * the same return value as before (we always csum_fold before
615 * testing, and that removes any differences). However as we
616 * know that csum_partial always returned a 16bit value on
617 * alphas, do a fold to maximise conformity to previous behaviour.
619 sb
->sb_csum
= md_csum_fold(disk_csum
);
621 sb
->sb_csum
= disk_csum
;
628 * Handle superblock details.
629 * We want to be able to handle multiple superblock formats
630 * so we have a common interface to them all, and an array of
631 * different handlers.
632 * We rely on user-space to write the initial superblock, and support
633 * reading and updating of superblocks.
634 * Interface methods are:
635 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
636 * loads and validates a superblock on dev.
637 * if refdev != NULL, compare superblocks on both devices
639 * 0 - dev has a superblock that is compatible with refdev
640 * 1 - dev has a superblock that is compatible and newer than refdev
641 * so dev should be used as the refdev in future
642 * -EINVAL superblock incompatible or invalid
643 * -othererror e.g. -EIO
645 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
646 * Verify that dev is acceptable into mddev.
647 * The first time, mddev->raid_disks will be 0, and data from
648 * dev should be merged in. Subsequent calls check that dev
649 * is new enough. Return 0 or -EINVAL
651 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
652 * Update the superblock for rdev with data in mddev
653 * This does not write to disc.
659 struct module
*owner
;
660 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
661 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
662 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
666 * load_super for 0.90.0
668 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
670 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
676 * Calculate the position of the superblock,
677 * it's at the end of the disk.
679 * It also happens to be a multiple of 4Kb.
681 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
682 rdev
->sb_offset
= sb_offset
;
684 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
689 bdevname(rdev
->bdev
, b
);
690 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
692 if (sb
->md_magic
!= MD_SB_MAGIC
) {
693 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
698 if (sb
->major_version
!= 0 ||
699 sb
->minor_version
< 90 ||
700 sb
->minor_version
> 91) {
701 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
702 sb
->major_version
, sb
->minor_version
,
707 if (sb
->raid_disks
<= 0)
710 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
711 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
716 rdev
->preferred_minor
= sb
->md_minor
;
717 rdev
->data_offset
= 0;
718 rdev
->sb_size
= MD_SB_BYTES
;
720 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
721 if (sb
->level
!= 1 && sb
->level
!= 4
722 && sb
->level
!= 5 && sb
->level
!= 6
723 && sb
->level
!= 10) {
724 /* FIXME use a better test */
726 "md: bitmaps not supported for this level.\n");
731 if (sb
->level
== LEVEL_MULTIPATH
)
734 rdev
->desc_nr
= sb
->this_disk
.number
;
740 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
741 if (!uuid_equal(refsb
, sb
)) {
742 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
743 b
, bdevname(refdev
->bdev
,b2
));
746 if (!sb_equal(refsb
, sb
)) {
747 printk(KERN_WARNING
"md: %s has same UUID"
748 " but different superblock to %s\n",
749 b
, bdevname(refdev
->bdev
, b2
));
753 ev2
= md_event(refsb
);
759 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
761 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
762 /* "this cannot possibly happen" ... */
770 * validate_super for 0.90.0
772 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
775 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
776 __u64 ev1
= md_event(sb
);
778 rdev
->raid_disk
= -1;
779 clear_bit(Faulty
, &rdev
->flags
);
780 clear_bit(In_sync
, &rdev
->flags
);
781 clear_bit(WriteMostly
, &rdev
->flags
);
782 clear_bit(BarriersNotsupp
, &rdev
->flags
);
784 if (mddev
->raid_disks
== 0) {
785 mddev
->major_version
= 0;
786 mddev
->minor_version
= sb
->minor_version
;
787 mddev
->patch_version
= sb
->patch_version
;
789 mddev
->chunk_size
= sb
->chunk_size
;
790 mddev
->ctime
= sb
->ctime
;
791 mddev
->utime
= sb
->utime
;
792 mddev
->level
= sb
->level
;
793 mddev
->clevel
[0] = 0;
794 mddev
->layout
= sb
->layout
;
795 mddev
->raid_disks
= sb
->raid_disks
;
796 mddev
->size
= sb
->size
;
798 mddev
->bitmap_offset
= 0;
799 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
801 if (mddev
->minor_version
>= 91) {
802 mddev
->reshape_position
= sb
->reshape_position
;
803 mddev
->delta_disks
= sb
->delta_disks
;
804 mddev
->new_level
= sb
->new_level
;
805 mddev
->new_layout
= sb
->new_layout
;
806 mddev
->new_chunk
= sb
->new_chunk
;
808 mddev
->reshape_position
= MaxSector
;
809 mddev
->delta_disks
= 0;
810 mddev
->new_level
= mddev
->level
;
811 mddev
->new_layout
= mddev
->layout
;
812 mddev
->new_chunk
= mddev
->chunk_size
;
815 if (sb
->state
& (1<<MD_SB_CLEAN
))
816 mddev
->recovery_cp
= MaxSector
;
818 if (sb
->events_hi
== sb
->cp_events_hi
&&
819 sb
->events_lo
== sb
->cp_events_lo
) {
820 mddev
->recovery_cp
= sb
->recovery_cp
;
822 mddev
->recovery_cp
= 0;
825 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
826 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
827 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
828 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
830 mddev
->max_disks
= MD_SB_DISKS
;
832 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
833 mddev
->bitmap_file
== NULL
)
834 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
836 } else if (mddev
->pers
== NULL
) {
837 /* Insist on good event counter while assembling */
839 if (ev1
< mddev
->events
)
841 } else if (mddev
->bitmap
) {
842 /* if adding to array with a bitmap, then we can accept an
843 * older device ... but not too old.
845 if (ev1
< mddev
->bitmap
->events_cleared
)
848 if (ev1
< mddev
->events
)
849 /* just a hot-add of a new device, leave raid_disk at -1 */
853 if (mddev
->level
!= LEVEL_MULTIPATH
) {
854 desc
= sb
->disks
+ rdev
->desc_nr
;
856 if (desc
->state
& (1<<MD_DISK_FAULTY
))
857 set_bit(Faulty
, &rdev
->flags
);
858 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
859 desc->raid_disk < mddev->raid_disks */) {
860 set_bit(In_sync
, &rdev
->flags
);
861 rdev
->raid_disk
= desc
->raid_disk
;
863 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
864 set_bit(WriteMostly
, &rdev
->flags
);
865 } else /* MULTIPATH are always insync */
866 set_bit(In_sync
, &rdev
->flags
);
871 * sync_super for 0.90.0
873 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
876 struct list_head
*tmp
;
878 int next_spare
= mddev
->raid_disks
;
881 /* make rdev->sb match mddev data..
884 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
885 * 3/ any empty disks < next_spare become removed
887 * disks[0] gets initialised to REMOVED because
888 * we cannot be sure from other fields if it has
889 * been initialised or not.
892 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
894 rdev
->sb_size
= MD_SB_BYTES
;
896 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
898 memset(sb
, 0, sizeof(*sb
));
900 sb
->md_magic
= MD_SB_MAGIC
;
901 sb
->major_version
= mddev
->major_version
;
902 sb
->patch_version
= mddev
->patch_version
;
903 sb
->gvalid_words
= 0; /* ignored */
904 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
905 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
906 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
907 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
909 sb
->ctime
= mddev
->ctime
;
910 sb
->level
= mddev
->level
;
911 sb
->size
= mddev
->size
;
912 sb
->raid_disks
= mddev
->raid_disks
;
913 sb
->md_minor
= mddev
->md_minor
;
914 sb
->not_persistent
= 0;
915 sb
->utime
= mddev
->utime
;
917 sb
->events_hi
= (mddev
->events
>>32);
918 sb
->events_lo
= (u32
)mddev
->events
;
920 if (mddev
->reshape_position
== MaxSector
)
921 sb
->minor_version
= 90;
923 sb
->minor_version
= 91;
924 sb
->reshape_position
= mddev
->reshape_position
;
925 sb
->new_level
= mddev
->new_level
;
926 sb
->delta_disks
= mddev
->delta_disks
;
927 sb
->new_layout
= mddev
->new_layout
;
928 sb
->new_chunk
= mddev
->new_chunk
;
930 mddev
->minor_version
= sb
->minor_version
;
933 sb
->recovery_cp
= mddev
->recovery_cp
;
934 sb
->cp_events_hi
= (mddev
->events
>>32);
935 sb
->cp_events_lo
= (u32
)mddev
->events
;
936 if (mddev
->recovery_cp
== MaxSector
)
937 sb
->state
= (1<< MD_SB_CLEAN
);
941 sb
->layout
= mddev
->layout
;
942 sb
->chunk_size
= mddev
->chunk_size
;
944 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
945 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
947 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
948 rdev_for_each(rdev2
, tmp
, mddev
) {
951 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
952 && !test_bit(Faulty
, &rdev2
->flags
))
953 desc_nr
= rdev2
->raid_disk
;
955 desc_nr
= next_spare
++;
956 rdev2
->desc_nr
= desc_nr
;
957 d
= &sb
->disks
[rdev2
->desc_nr
];
959 d
->number
= rdev2
->desc_nr
;
960 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
961 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
962 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
963 && !test_bit(Faulty
, &rdev2
->flags
))
964 d
->raid_disk
= rdev2
->raid_disk
;
966 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
967 if (test_bit(Faulty
, &rdev2
->flags
))
968 d
->state
= (1<<MD_DISK_FAULTY
);
969 else if (test_bit(In_sync
, &rdev2
->flags
)) {
970 d
->state
= (1<<MD_DISK_ACTIVE
);
971 d
->state
|= (1<<MD_DISK_SYNC
);
979 if (test_bit(WriteMostly
, &rdev2
->flags
))
980 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
982 /* now set the "removed" and "faulty" bits on any missing devices */
983 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
984 mdp_disk_t
*d
= &sb
->disks
[i
];
985 if (d
->state
== 0 && d
->number
== 0) {
988 d
->state
= (1<<MD_DISK_REMOVED
);
989 d
->state
|= (1<<MD_DISK_FAULTY
);
993 sb
->nr_disks
= nr_disks
;
994 sb
->active_disks
= active
;
995 sb
->working_disks
= working
;
996 sb
->failed_disks
= failed
;
997 sb
->spare_disks
= spare
;
999 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1000 sb
->sb_csum
= calc_sb_csum(sb
);
1004 * version 1 superblock
1007 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1011 unsigned long long newcsum
;
1012 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1013 __le32
*isuper
= (__le32
*)sb
;
1016 disk_csum
= sb
->sb_csum
;
1019 for (i
=0; size
>=4; size
-= 4 )
1020 newcsum
+= le32_to_cpu(*isuper
++);
1023 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1025 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1026 sb
->sb_csum
= disk_csum
;
1027 return cpu_to_le32(csum
);
1030 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1032 struct mdp_superblock_1
*sb
;
1035 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1039 * Calculate the position of the superblock.
1040 * It is always aligned to a 4K boundary and
1041 * depeding on minor_version, it can be:
1042 * 0: At least 8K, but less than 12K, from end of device
1043 * 1: At start of device
1044 * 2: 4K from start of device.
1046 switch(minor_version
) {
1048 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1050 sb_offset
&= ~(sector_t
)(4*2-1);
1051 /* convert from sectors to K */
1063 rdev
->sb_offset
= sb_offset
;
1065 /* superblock is rarely larger than 1K, but it can be larger,
1066 * and it is safe to read 4k, so we do that
1068 ret
= read_disk_sb(rdev
, 4096);
1069 if (ret
) return ret
;
1072 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1074 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1075 sb
->major_version
!= cpu_to_le32(1) ||
1076 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1077 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1078 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1081 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1082 printk("md: invalid superblock checksum on %s\n",
1083 bdevname(rdev
->bdev
,b
));
1086 if (le64_to_cpu(sb
->data_size
) < 10) {
1087 printk("md: data_size too small on %s\n",
1088 bdevname(rdev
->bdev
,b
));
1091 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1092 if (sb
->level
!= cpu_to_le32(1) &&
1093 sb
->level
!= cpu_to_le32(4) &&
1094 sb
->level
!= cpu_to_le32(5) &&
1095 sb
->level
!= cpu_to_le32(6) &&
1096 sb
->level
!= cpu_to_le32(10)) {
1098 "md: bitmaps not supported for this level.\n");
1103 rdev
->preferred_minor
= 0xffff;
1104 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1105 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1107 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1108 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1109 if (rdev
->sb_size
& bmask
)
1110 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1113 && rdev
->data_offset
< sb_offset
+ (rdev
->sb_size
/512))
1116 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1119 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1125 struct mdp_superblock_1
*refsb
=
1126 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1128 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1129 sb
->level
!= refsb
->level
||
1130 sb
->layout
!= refsb
->layout
||
1131 sb
->chunksize
!= refsb
->chunksize
) {
1132 printk(KERN_WARNING
"md: %s has strangely different"
1133 " superblock to %s\n",
1134 bdevname(rdev
->bdev
,b
),
1135 bdevname(refdev
->bdev
,b2
));
1138 ev1
= le64_to_cpu(sb
->events
);
1139 ev2
= le64_to_cpu(refsb
->events
);
1147 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1149 rdev
->size
= rdev
->sb_offset
;
1150 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1152 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1153 if (le32_to_cpu(sb
->chunksize
))
1154 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1156 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1161 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1163 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1164 __u64 ev1
= le64_to_cpu(sb
->events
);
1166 rdev
->raid_disk
= -1;
1167 clear_bit(Faulty
, &rdev
->flags
);
1168 clear_bit(In_sync
, &rdev
->flags
);
1169 clear_bit(WriteMostly
, &rdev
->flags
);
1170 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1172 if (mddev
->raid_disks
== 0) {
1173 mddev
->major_version
= 1;
1174 mddev
->patch_version
= 0;
1175 mddev
->external
= 0;
1176 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1177 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1178 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1179 mddev
->level
= le32_to_cpu(sb
->level
);
1180 mddev
->clevel
[0] = 0;
1181 mddev
->layout
= le32_to_cpu(sb
->layout
);
1182 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1183 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1184 mddev
->events
= ev1
;
1185 mddev
->bitmap_offset
= 0;
1186 mddev
->default_bitmap_offset
= 1024 >> 9;
1188 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1189 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1191 mddev
->max_disks
= (4096-256)/2;
1193 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1194 mddev
->bitmap_file
== NULL
)
1195 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1197 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1198 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1199 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1200 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1201 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1202 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1204 mddev
->reshape_position
= MaxSector
;
1205 mddev
->delta_disks
= 0;
1206 mddev
->new_level
= mddev
->level
;
1207 mddev
->new_layout
= mddev
->layout
;
1208 mddev
->new_chunk
= mddev
->chunk_size
;
1211 } else if (mddev
->pers
== NULL
) {
1212 /* Insist of good event counter while assembling */
1214 if (ev1
< mddev
->events
)
1216 } else if (mddev
->bitmap
) {
1217 /* If adding to array with a bitmap, then we can accept an
1218 * older device, but not too old.
1220 if (ev1
< mddev
->bitmap
->events_cleared
)
1223 if (ev1
< mddev
->events
)
1224 /* just a hot-add of a new device, leave raid_disk at -1 */
1227 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1229 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1231 case 0xffff: /* spare */
1233 case 0xfffe: /* faulty */
1234 set_bit(Faulty
, &rdev
->flags
);
1237 if ((le32_to_cpu(sb
->feature_map
) &
1238 MD_FEATURE_RECOVERY_OFFSET
))
1239 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1241 set_bit(In_sync
, &rdev
->flags
);
1242 rdev
->raid_disk
= role
;
1245 if (sb
->devflags
& WriteMostly1
)
1246 set_bit(WriteMostly
, &rdev
->flags
);
1247 } else /* MULTIPATH are always insync */
1248 set_bit(In_sync
, &rdev
->flags
);
1253 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1255 struct mdp_superblock_1
*sb
;
1256 struct list_head
*tmp
;
1259 /* make rdev->sb match mddev and rdev data. */
1261 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1263 sb
->feature_map
= 0;
1265 sb
->recovery_offset
= cpu_to_le64(0);
1266 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1267 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1268 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1270 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1271 sb
->events
= cpu_to_le64(mddev
->events
);
1273 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1275 sb
->resync_offset
= cpu_to_le64(0);
1277 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1279 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1280 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1282 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1283 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1284 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1287 if (rdev
->raid_disk
>= 0 &&
1288 !test_bit(In_sync
, &rdev
->flags
) &&
1289 rdev
->recovery_offset
> 0) {
1290 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1291 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1294 if (mddev
->reshape_position
!= MaxSector
) {
1295 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1296 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1297 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1298 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1299 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1300 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1304 rdev_for_each(rdev2
, tmp
, mddev
)
1305 if (rdev2
->desc_nr
+1 > max_dev
)
1306 max_dev
= rdev2
->desc_nr
+1;
1308 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1309 sb
->max_dev
= cpu_to_le32(max_dev
);
1310 for (i
=0; i
<max_dev
;i
++)
1311 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1313 rdev_for_each(rdev2
, tmp
, mddev
) {
1315 if (test_bit(Faulty
, &rdev2
->flags
))
1316 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1317 else if (test_bit(In_sync
, &rdev2
->flags
))
1318 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1319 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1320 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1322 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1325 sb
->sb_csum
= calc_sb_1_csum(sb
);
1329 static struct super_type super_types
[] = {
1332 .owner
= THIS_MODULE
,
1333 .load_super
= super_90_load
,
1334 .validate_super
= super_90_validate
,
1335 .sync_super
= super_90_sync
,
1339 .owner
= THIS_MODULE
,
1340 .load_super
= super_1_load
,
1341 .validate_super
= super_1_validate
,
1342 .sync_super
= super_1_sync
,
1346 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1348 struct list_head
*tmp
, *tmp2
;
1349 mdk_rdev_t
*rdev
, *rdev2
;
1351 rdev_for_each(rdev
, tmp
, mddev1
)
1352 rdev_for_each(rdev2
, tmp2
, mddev2
)
1353 if (rdev
->bdev
->bd_contains
==
1354 rdev2
->bdev
->bd_contains
)
1360 static LIST_HEAD(pending_raid_disks
);
1362 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1364 char b
[BDEVNAME_SIZE
];
1373 /* make sure rdev->size exceeds mddev->size */
1374 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1376 /* Cannot change size, so fail
1377 * If mddev->level <= 0, then we don't care
1378 * about aligning sizes (e.g. linear)
1380 if (mddev
->level
> 0)
1383 mddev
->size
= rdev
->size
;
1386 /* Verify rdev->desc_nr is unique.
1387 * If it is -1, assign a free number, else
1388 * check number is not in use
1390 if (rdev
->desc_nr
< 0) {
1392 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1393 while (find_rdev_nr(mddev
, choice
))
1395 rdev
->desc_nr
= choice
;
1397 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1400 bdevname(rdev
->bdev
,b
);
1401 while ( (s
=strchr(b
, '/')) != NULL
)
1404 rdev
->mddev
= mddev
;
1405 printk(KERN_INFO
"md: bind<%s>\n", b
);
1407 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1410 if (rdev
->bdev
->bd_part
)
1411 ko
= &rdev
->bdev
->bd_part
->dev
.kobj
;
1413 ko
= &rdev
->bdev
->bd_disk
->dev
.kobj
;
1414 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1415 kobject_del(&rdev
->kobj
);
1418 list_add(&rdev
->same_set
, &mddev
->disks
);
1419 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1423 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1428 static void md_delayed_delete(struct work_struct
*ws
)
1430 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1431 kobject_del(&rdev
->kobj
);
1432 kobject_put(&rdev
->kobj
);
1435 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1437 char b
[BDEVNAME_SIZE
];
1442 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1443 list_del_init(&rdev
->same_set
);
1444 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1446 sysfs_remove_link(&rdev
->kobj
, "block");
1448 /* We need to delay this, otherwise we can deadlock when
1449 * writing to 'remove' to "dev/state"
1451 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1452 kobject_get(&rdev
->kobj
);
1453 schedule_work(&rdev
->del_work
);
1457 * prevent the device from being mounted, repartitioned or
1458 * otherwise reused by a RAID array (or any other kernel
1459 * subsystem), by bd_claiming the device.
1461 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1464 struct block_device
*bdev
;
1465 char b
[BDEVNAME_SIZE
];
1467 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1469 printk(KERN_ERR
"md: could not open %s.\n",
1470 __bdevname(dev
, b
));
1471 return PTR_ERR(bdev
);
1473 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1475 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1481 set_bit(AllReserved
, &rdev
->flags
);
1486 static void unlock_rdev(mdk_rdev_t
*rdev
)
1488 struct block_device
*bdev
= rdev
->bdev
;
1496 void md_autodetect_dev(dev_t dev
);
1498 static void export_rdev(mdk_rdev_t
* rdev
)
1500 char b
[BDEVNAME_SIZE
];
1501 printk(KERN_INFO
"md: export_rdev(%s)\n",
1502 bdevname(rdev
->bdev
,b
));
1506 list_del_init(&rdev
->same_set
);
1508 if (test_bit(AutoDetected
, &rdev
->flags
))
1509 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1512 kobject_put(&rdev
->kobj
);
1515 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1517 unbind_rdev_from_array(rdev
);
1521 static void export_array(mddev_t
*mddev
)
1523 struct list_head
*tmp
;
1526 rdev_for_each(rdev
, tmp
, mddev
) {
1531 kick_rdev_from_array(rdev
);
1533 if (!list_empty(&mddev
->disks
))
1535 mddev
->raid_disks
= 0;
1536 mddev
->major_version
= 0;
1539 static void print_desc(mdp_disk_t
*desc
)
1541 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1542 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1545 static void print_sb(mdp_super_t
*sb
)
1550 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1551 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1552 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1554 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1555 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1556 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1557 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1558 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1559 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1560 sb
->failed_disks
, sb
->spare_disks
,
1561 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1564 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1567 desc
= sb
->disks
+ i
;
1568 if (desc
->number
|| desc
->major
|| desc
->minor
||
1569 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1570 printk(" D %2d: ", i
);
1574 printk(KERN_INFO
"md: THIS: ");
1575 print_desc(&sb
->this_disk
);
1579 static void print_rdev(mdk_rdev_t
*rdev
)
1581 char b
[BDEVNAME_SIZE
];
1582 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1583 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1584 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1586 if (rdev
->sb_loaded
) {
1587 printk(KERN_INFO
"md: rdev superblock:\n");
1588 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1590 printk(KERN_INFO
"md: no rdev superblock!\n");
1593 static void md_print_devices(void)
1595 struct list_head
*tmp
, *tmp2
;
1598 char b
[BDEVNAME_SIZE
];
1601 printk("md: **********************************\n");
1602 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1603 printk("md: **********************************\n");
1604 for_each_mddev(mddev
, tmp
) {
1607 bitmap_print_sb(mddev
->bitmap
);
1609 printk("%s: ", mdname(mddev
));
1610 rdev_for_each(rdev
, tmp2
, mddev
)
1611 printk("<%s>", bdevname(rdev
->bdev
,b
));
1614 rdev_for_each(rdev
, tmp2
, mddev
)
1617 printk("md: **********************************\n");
1622 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1624 /* Update each superblock (in-memory image), but
1625 * if we are allowed to, skip spares which already
1626 * have the right event counter, or have one earlier
1627 * (which would mean they aren't being marked as dirty
1628 * with the rest of the array)
1631 struct list_head
*tmp
;
1633 rdev_for_each(rdev
, tmp
, mddev
) {
1634 if (rdev
->sb_events
== mddev
->events
||
1636 rdev
->raid_disk
< 0 &&
1637 (rdev
->sb_events
&1)==0 &&
1638 rdev
->sb_events
+1 == mddev
->events
)) {
1639 /* Don't update this superblock */
1640 rdev
->sb_loaded
= 2;
1642 super_types
[mddev
->major_version
].
1643 sync_super(mddev
, rdev
);
1644 rdev
->sb_loaded
= 1;
1649 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1651 struct list_head
*tmp
;
1656 if (mddev
->external
)
1659 spin_lock_irq(&mddev
->write_lock
);
1661 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1662 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1664 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1665 /* just a clean<-> dirty transition, possibly leave spares alone,
1666 * though if events isn't the right even/odd, we will have to do
1672 if (mddev
->degraded
)
1673 /* If the array is degraded, then skipping spares is both
1674 * dangerous and fairly pointless.
1675 * Dangerous because a device that was removed from the array
1676 * might have a event_count that still looks up-to-date,
1677 * so it can be re-added without a resync.
1678 * Pointless because if there are any spares to skip,
1679 * then a recovery will happen and soon that array won't
1680 * be degraded any more and the spare can go back to sleep then.
1684 sync_req
= mddev
->in_sync
;
1685 mddev
->utime
= get_seconds();
1687 /* If this is just a dirty<->clean transition, and the array is clean
1688 * and 'events' is odd, we can roll back to the previous clean state */
1690 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1691 && (mddev
->events
& 1)
1692 && mddev
->events
!= 1)
1695 /* otherwise we have to go forward and ... */
1697 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1698 /* .. if the array isn't clean, insist on an odd 'events' */
1699 if ((mddev
->events
&1)==0) {
1704 /* otherwise insist on an even 'events' (for clean states) */
1705 if ((mddev
->events
&1)) {
1712 if (!mddev
->events
) {
1714 * oops, this 64-bit counter should never wrap.
1715 * Either we are in around ~1 trillion A.C., assuming
1716 * 1 reboot per second, or we have a bug:
1723 * do not write anything to disk if using
1724 * nonpersistent superblocks
1726 if (!mddev
->persistent
) {
1727 if (!mddev
->external
)
1728 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1730 spin_unlock_irq(&mddev
->write_lock
);
1731 wake_up(&mddev
->sb_wait
);
1734 sync_sbs(mddev
, nospares
);
1735 spin_unlock_irq(&mddev
->write_lock
);
1738 "md: updating %s RAID superblock on device (in sync %d)\n",
1739 mdname(mddev
),mddev
->in_sync
);
1741 bitmap_update_sb(mddev
->bitmap
);
1742 rdev_for_each(rdev
, tmp
, mddev
) {
1743 char b
[BDEVNAME_SIZE
];
1744 dprintk(KERN_INFO
"md: ");
1745 if (rdev
->sb_loaded
!= 1)
1746 continue; /* no noise on spare devices */
1747 if (test_bit(Faulty
, &rdev
->flags
))
1748 dprintk("(skipping faulty ");
1750 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1751 if (!test_bit(Faulty
, &rdev
->flags
)) {
1752 md_super_write(mddev
,rdev
,
1753 rdev
->sb_offset
<<1, rdev
->sb_size
,
1755 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1756 bdevname(rdev
->bdev
,b
),
1757 (unsigned long long)rdev
->sb_offset
);
1758 rdev
->sb_events
= mddev
->events
;
1762 if (mddev
->level
== LEVEL_MULTIPATH
)
1763 /* only need to write one superblock... */
1766 md_super_wait(mddev
);
1767 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1769 spin_lock_irq(&mddev
->write_lock
);
1770 if (mddev
->in_sync
!= sync_req
||
1771 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1772 /* have to write it out again */
1773 spin_unlock_irq(&mddev
->write_lock
);
1776 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1777 spin_unlock_irq(&mddev
->write_lock
);
1778 wake_up(&mddev
->sb_wait
);
1782 /* words written to sysfs files may, or my not, be \n terminated.
1783 * We want to accept with case. For this we use cmd_match.
1785 static int cmd_match(const char *cmd
, const char *str
)
1787 /* See if cmd, written into a sysfs file, matches
1788 * str. They must either be the same, or cmd can
1789 * have a trailing newline
1791 while (*cmd
&& *str
&& *cmd
== *str
) {
1802 struct rdev_sysfs_entry
{
1803 struct attribute attr
;
1804 ssize_t (*show
)(mdk_rdev_t
*, char *);
1805 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1809 state_show(mdk_rdev_t
*rdev
, char *page
)
1814 if (test_bit(Faulty
, &rdev
->flags
)) {
1815 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1818 if (test_bit(In_sync
, &rdev
->flags
)) {
1819 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1822 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1823 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1826 if (!test_bit(Faulty
, &rdev
->flags
) &&
1827 !test_bit(In_sync
, &rdev
->flags
)) {
1828 len
+= sprintf(page
+len
, "%sspare", sep
);
1831 return len
+sprintf(page
+len
, "\n");
1835 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1838 * faulty - simulates and error
1839 * remove - disconnects the device
1840 * writemostly - sets write_mostly
1841 * -writemostly - clears write_mostly
1844 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1845 md_error(rdev
->mddev
, rdev
);
1847 } else if (cmd_match(buf
, "remove")) {
1848 if (rdev
->raid_disk
>= 0)
1851 mddev_t
*mddev
= rdev
->mddev
;
1852 kick_rdev_from_array(rdev
);
1854 md_update_sb(mddev
, 1);
1855 md_new_event(mddev
);
1858 } else if (cmd_match(buf
, "writemostly")) {
1859 set_bit(WriteMostly
, &rdev
->flags
);
1861 } else if (cmd_match(buf
, "-writemostly")) {
1862 clear_bit(WriteMostly
, &rdev
->flags
);
1865 return err
? err
: len
;
1867 static struct rdev_sysfs_entry rdev_state
=
1868 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1871 errors_show(mdk_rdev_t
*rdev
, char *page
)
1873 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1877 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1880 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1881 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1882 atomic_set(&rdev
->corrected_errors
, n
);
1887 static struct rdev_sysfs_entry rdev_errors
=
1888 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1891 slot_show(mdk_rdev_t
*rdev
, char *page
)
1893 if (rdev
->raid_disk
< 0)
1894 return sprintf(page
, "none\n");
1896 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1900 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1905 int slot
= simple_strtoul(buf
, &e
, 10);
1906 if (strncmp(buf
, "none", 4)==0)
1908 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1910 if (rdev
->mddev
->pers
) {
1911 /* Setting 'slot' on an active array requires also
1912 * updating the 'rd%d' link, and communicating
1913 * with the personality with ->hot_*_disk.
1914 * For now we only support removing
1915 * failed/spare devices. This normally happens automatically,
1916 * but not when the metadata is externally managed.
1920 if (rdev
->raid_disk
== -1)
1922 /* personality does all needed checks */
1923 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
1925 err
= rdev
->mddev
->pers
->
1926 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
1929 sprintf(nm
, "rd%d", rdev
->raid_disk
);
1930 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
1931 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1932 md_wakeup_thread(rdev
->mddev
->thread
);
1934 if (slot
>= rdev
->mddev
->raid_disks
)
1936 rdev
->raid_disk
= slot
;
1937 /* assume it is working */
1938 clear_bit(Faulty
, &rdev
->flags
);
1939 clear_bit(WriteMostly
, &rdev
->flags
);
1940 set_bit(In_sync
, &rdev
->flags
);
1946 static struct rdev_sysfs_entry rdev_slot
=
1947 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
1950 offset_show(mdk_rdev_t
*rdev
, char *page
)
1952 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1956 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1959 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1960 if (e
==buf
|| (*e
&& *e
!= '\n'))
1962 if (rdev
->mddev
->pers
)
1964 if (rdev
->size
&& rdev
->mddev
->external
)
1965 /* Must set offset before size, so overlap checks
1968 rdev
->data_offset
= offset
;
1972 static struct rdev_sysfs_entry rdev_offset
=
1973 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
1976 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1978 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1981 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
1983 /* check if two start/length pairs overlap */
1992 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1995 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1996 unsigned long long oldsize
= rdev
->size
;
1997 mddev_t
*my_mddev
= rdev
->mddev
;
1999 if (e
==buf
|| (*e
&& *e
!= '\n'))
2004 if (size
> oldsize
&& rdev
->mddev
->external
) {
2005 /* need to check that all other rdevs with the same ->bdev
2006 * do not overlap. We need to unlock the mddev to avoid
2007 * a deadlock. We have already changed rdev->size, and if
2008 * we have to change it back, we will have the lock again.
2012 struct list_head
*tmp
, *tmp2
;
2014 mddev_unlock(my_mddev
);
2015 for_each_mddev(mddev
, tmp
) {
2019 rdev_for_each(rdev2
, tmp2
, mddev
)
2020 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2021 (rdev
->bdev
== rdev2
->bdev
&&
2023 overlaps(rdev
->data_offset
, rdev
->size
,
2024 rdev2
->data_offset
, rdev2
->size
))) {
2028 mddev_unlock(mddev
);
2034 mddev_lock(my_mddev
);
2036 /* Someone else could have slipped in a size
2037 * change here, but doing so is just silly.
2038 * We put oldsize back because we *know* it is
2039 * safe, and trust userspace not to race with
2042 rdev
->size
= oldsize
;
2046 if (size
< my_mddev
->size
|| my_mddev
->size
== 0)
2047 my_mddev
->size
= size
;
2051 static struct rdev_sysfs_entry rdev_size
=
2052 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2054 static struct attribute
*rdev_default_attrs
[] = {
2063 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2065 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2066 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2067 mddev_t
*mddev
= rdev
->mddev
;
2073 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2075 if (rdev
->mddev
== NULL
)
2078 rv
= entry
->show(rdev
, page
);
2079 mddev_unlock(mddev
);
2085 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2086 const char *page
, size_t length
)
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
);
2091 mddev_t
*mddev
= rdev
->mddev
;
2095 if (!capable(CAP_SYS_ADMIN
))
2097 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2099 if (rdev
->mddev
== NULL
)
2102 rv
= entry
->store(rdev
, page
, length
);
2103 mddev_unlock(mddev
);
2108 static void rdev_free(struct kobject
*ko
)
2110 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2113 static struct sysfs_ops rdev_sysfs_ops
= {
2114 .show
= rdev_attr_show
,
2115 .store
= rdev_attr_store
,
2117 static struct kobj_type rdev_ktype
= {
2118 .release
= rdev_free
,
2119 .sysfs_ops
= &rdev_sysfs_ops
,
2120 .default_attrs
= rdev_default_attrs
,
2124 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2126 * mark the device faulty if:
2128 * - the device is nonexistent (zero size)
2129 * - the device has no valid superblock
2131 * a faulty rdev _never_ has rdev->sb set.
2133 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2135 char b
[BDEVNAME_SIZE
];
2140 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2142 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2143 return ERR_PTR(-ENOMEM
);
2146 if ((err
= alloc_disk_sb(rdev
)))
2149 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2153 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2156 rdev
->saved_raid_disk
= -1;
2157 rdev
->raid_disk
= -1;
2159 rdev
->data_offset
= 0;
2160 rdev
->sb_events
= 0;
2161 atomic_set(&rdev
->nr_pending
, 0);
2162 atomic_set(&rdev
->read_errors
, 0);
2163 atomic_set(&rdev
->corrected_errors
, 0);
2165 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2168 "md: %s has zero or unknown size, marking faulty!\n",
2169 bdevname(rdev
->bdev
,b
));
2174 if (super_format
>= 0) {
2175 err
= super_types
[super_format
].
2176 load_super(rdev
, NULL
, super_minor
);
2177 if (err
== -EINVAL
) {
2179 "md: %s does not have a valid v%d.%d "
2180 "superblock, not importing!\n",
2181 bdevname(rdev
->bdev
,b
),
2182 super_format
, super_minor
);
2187 "md: could not read %s's sb, not importing!\n",
2188 bdevname(rdev
->bdev
,b
));
2192 INIT_LIST_HEAD(&rdev
->same_set
);
2197 if (rdev
->sb_page
) {
2203 return ERR_PTR(err
);
2207 * Check a full RAID array for plausibility
2211 static void analyze_sbs(mddev_t
* mddev
)
2214 struct list_head
*tmp
;
2215 mdk_rdev_t
*rdev
, *freshest
;
2216 char b
[BDEVNAME_SIZE
];
2219 rdev_for_each(rdev
, tmp
, mddev
)
2220 switch (super_types
[mddev
->major_version
].
2221 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2229 "md: fatal superblock inconsistency in %s"
2230 " -- removing from array\n",
2231 bdevname(rdev
->bdev
,b
));
2232 kick_rdev_from_array(rdev
);
2236 super_types
[mddev
->major_version
].
2237 validate_super(mddev
, freshest
);
2240 rdev_for_each(rdev
, tmp
, mddev
) {
2241 if (rdev
!= freshest
)
2242 if (super_types
[mddev
->major_version
].
2243 validate_super(mddev
, rdev
)) {
2244 printk(KERN_WARNING
"md: kicking non-fresh %s"
2246 bdevname(rdev
->bdev
,b
));
2247 kick_rdev_from_array(rdev
);
2250 if (mddev
->level
== LEVEL_MULTIPATH
) {
2251 rdev
->desc_nr
= i
++;
2252 rdev
->raid_disk
= rdev
->desc_nr
;
2253 set_bit(In_sync
, &rdev
->flags
);
2254 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2255 rdev
->raid_disk
= -1;
2256 clear_bit(In_sync
, &rdev
->flags
);
2262 if (mddev
->recovery_cp
!= MaxSector
&&
2264 printk(KERN_ERR
"md: %s: raid array is not clean"
2265 " -- starting background reconstruction\n",
2271 safe_delay_show(mddev_t
*mddev
, char *page
)
2273 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2274 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2277 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2285 /* remove a period, and count digits after it */
2286 if (len
>= sizeof(buf
))
2288 strlcpy(buf
, cbuf
, len
);
2290 for (i
=0; i
<len
; i
++) {
2292 if (isdigit(buf
[i
])) {
2297 } else if (buf
[i
] == '.') {
2302 msec
= simple_strtoul(buf
, &e
, 10);
2303 if (e
== buf
|| (*e
&& *e
!= '\n'))
2305 msec
= (msec
* 1000) / scale
;
2307 mddev
->safemode_delay
= 0;
2309 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2310 if (mddev
->safemode_delay
== 0)
2311 mddev
->safemode_delay
= 1;
2315 static struct md_sysfs_entry md_safe_delay
=
2316 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2319 level_show(mddev_t
*mddev
, char *page
)
2321 struct mdk_personality
*p
= mddev
->pers
;
2323 return sprintf(page
, "%s\n", p
->name
);
2324 else if (mddev
->clevel
[0])
2325 return sprintf(page
, "%s\n", mddev
->clevel
);
2326 else if (mddev
->level
!= LEVEL_NONE
)
2327 return sprintf(page
, "%d\n", mddev
->level
);
2333 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2340 if (len
>= sizeof(mddev
->clevel
))
2342 strncpy(mddev
->clevel
, buf
, len
);
2343 if (mddev
->clevel
[len
-1] == '\n')
2345 mddev
->clevel
[len
] = 0;
2346 mddev
->level
= LEVEL_NONE
;
2350 static struct md_sysfs_entry md_level
=
2351 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2355 layout_show(mddev_t
*mddev
, char *page
)
2357 /* just a number, not meaningful for all levels */
2358 if (mddev
->reshape_position
!= MaxSector
&&
2359 mddev
->layout
!= mddev
->new_layout
)
2360 return sprintf(page
, "%d (%d)\n",
2361 mddev
->new_layout
, mddev
->layout
);
2362 return sprintf(page
, "%d\n", mddev
->layout
);
2366 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2369 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2371 if (!*buf
|| (*e
&& *e
!= '\n'))
2376 if (mddev
->reshape_position
!= MaxSector
)
2377 mddev
->new_layout
= n
;
2382 static struct md_sysfs_entry md_layout
=
2383 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2387 raid_disks_show(mddev_t
*mddev
, char *page
)
2389 if (mddev
->raid_disks
== 0)
2391 if (mddev
->reshape_position
!= MaxSector
&&
2392 mddev
->delta_disks
!= 0)
2393 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2394 mddev
->raid_disks
- mddev
->delta_disks
);
2395 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2398 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2401 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2405 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2407 if (!*buf
|| (*e
&& *e
!= '\n'))
2411 rv
= update_raid_disks(mddev
, n
);
2412 else if (mddev
->reshape_position
!= MaxSector
) {
2413 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2414 mddev
->delta_disks
= n
- olddisks
;
2415 mddev
->raid_disks
= n
;
2417 mddev
->raid_disks
= n
;
2418 return rv
? rv
: len
;
2420 static struct md_sysfs_entry md_raid_disks
=
2421 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2424 chunk_size_show(mddev_t
*mddev
, char *page
)
2426 if (mddev
->reshape_position
!= MaxSector
&&
2427 mddev
->chunk_size
!= mddev
->new_chunk
)
2428 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2430 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2434 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2436 /* can only set chunk_size if array is not yet active */
2438 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2440 if (!*buf
|| (*e
&& *e
!= '\n'))
2445 else if (mddev
->reshape_position
!= MaxSector
)
2446 mddev
->new_chunk
= n
;
2448 mddev
->chunk_size
= n
;
2451 static struct md_sysfs_entry md_chunk_size
=
2452 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2455 resync_start_show(mddev_t
*mddev
, char *page
)
2457 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2461 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2463 /* can only set chunk_size if array is not yet active */
2465 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2469 if (!*buf
|| (*e
&& *e
!= '\n'))
2472 mddev
->recovery_cp
= n
;
2475 static struct md_sysfs_entry md_resync_start
=
2476 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2479 * The array state can be:
2482 * No devices, no size, no level
2483 * Equivalent to STOP_ARRAY ioctl
2485 * May have some settings, but array is not active
2486 * all IO results in error
2487 * When written, doesn't tear down array, but just stops it
2488 * suspended (not supported yet)
2489 * All IO requests will block. The array can be reconfigured.
2490 * Writing this, if accepted, will block until array is quiessent
2492 * no resync can happen. no superblocks get written.
2493 * write requests fail
2495 * like readonly, but behaves like 'clean' on a write request.
2497 * clean - no pending writes, but otherwise active.
2498 * When written to inactive array, starts without resync
2499 * If a write request arrives then
2500 * if metadata is known, mark 'dirty' and switch to 'active'.
2501 * if not known, block and switch to write-pending
2502 * If written to an active array that has pending writes, then fails.
2504 * fully active: IO and resync can be happening.
2505 * When written to inactive array, starts with resync
2508 * clean, but writes are blocked waiting for 'active' to be written.
2511 * like active, but no writes have been seen for a while (100msec).
2514 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2515 write_pending
, active_idle
, bad_word
};
2516 static char *array_states
[] = {
2517 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2518 "write-pending", "active-idle", NULL
};
2520 static int match_word(const char *word
, char **list
)
2523 for (n
=0; list
[n
]; n
++)
2524 if (cmd_match(word
, list
[n
]))
2530 array_state_show(mddev_t
*mddev
, char *page
)
2532 enum array_state st
= inactive
;
2545 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2547 else if (mddev
->safemode
)
2553 if (list_empty(&mddev
->disks
) &&
2554 mddev
->raid_disks
== 0 &&
2560 return sprintf(page
, "%s\n", array_states
[st
]);
2563 static int do_md_stop(mddev_t
* mddev
, int ro
);
2564 static int do_md_run(mddev_t
* mddev
);
2565 static int restart_array(mddev_t
*mddev
);
2568 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2571 enum array_state st
= match_word(buf
, array_states
);
2576 /* stopping an active array */
2577 if (atomic_read(&mddev
->active
) > 1)
2579 err
= do_md_stop(mddev
, 0);
2582 /* stopping an active array */
2584 if (atomic_read(&mddev
->active
) > 1)
2586 err
= do_md_stop(mddev
, 2);
2588 err
= 0; /* already inactive */
2591 break; /* not supported yet */
2594 err
= do_md_stop(mddev
, 1);
2597 err
= do_md_run(mddev
);
2601 /* stopping an active array */
2603 err
= do_md_stop(mddev
, 1);
2605 mddev
->ro
= 2; /* FIXME mark devices writable */
2608 err
= do_md_run(mddev
);
2613 restart_array(mddev
);
2614 spin_lock_irq(&mddev
->write_lock
);
2615 if (atomic_read(&mddev
->writes_pending
) == 0) {
2616 if (mddev
->in_sync
== 0) {
2618 if (mddev
->persistent
)
2619 set_bit(MD_CHANGE_CLEAN
,
2625 spin_unlock_irq(&mddev
->write_lock
);
2628 mddev
->recovery_cp
= MaxSector
;
2629 err
= do_md_run(mddev
);
2634 restart_array(mddev
);
2635 if (mddev
->external
)
2636 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2637 wake_up(&mddev
->sb_wait
);
2641 err
= do_md_run(mddev
);
2646 /* these cannot be set */
2654 static struct md_sysfs_entry md_array_state
=
2655 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2658 null_show(mddev_t
*mddev
, char *page
)
2664 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2666 /* buf must be %d:%d\n? giving major and minor numbers */
2667 /* The new device is added to the array.
2668 * If the array has a persistent superblock, we read the
2669 * superblock to initialise info and check validity.
2670 * Otherwise, only checking done is that in bind_rdev_to_array,
2671 * which mainly checks size.
2674 int major
= simple_strtoul(buf
, &e
, 10);
2680 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2682 minor
= simple_strtoul(e
+1, &e
, 10);
2683 if (*e
&& *e
!= '\n')
2685 dev
= MKDEV(major
, minor
);
2686 if (major
!= MAJOR(dev
) ||
2687 minor
!= MINOR(dev
))
2691 if (mddev
->persistent
) {
2692 rdev
= md_import_device(dev
, mddev
->major_version
,
2693 mddev
->minor_version
);
2694 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2695 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2696 mdk_rdev_t
, same_set
);
2697 err
= super_types
[mddev
->major_version
]
2698 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2702 } else if (mddev
->external
)
2703 rdev
= md_import_device(dev
, -2, -1);
2705 rdev
= md_import_device(dev
, -1, -1);
2708 return PTR_ERR(rdev
);
2709 err
= bind_rdev_to_array(rdev
, mddev
);
2713 return err
? err
: len
;
2716 static struct md_sysfs_entry md_new_device
=
2717 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2720 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2723 unsigned long chunk
, end_chunk
;
2727 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2729 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2730 if (buf
== end
) break;
2731 if (*end
== '-') { /* range */
2733 end_chunk
= simple_strtoul(buf
, &end
, 0);
2734 if (buf
== end
) break;
2736 if (*end
&& !isspace(*end
)) break;
2737 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2739 while (isspace(*buf
)) buf
++;
2741 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2746 static struct md_sysfs_entry md_bitmap
=
2747 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2750 size_show(mddev_t
*mddev
, char *page
)
2752 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2755 static int update_size(mddev_t
*mddev
, unsigned long size
);
2758 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2760 /* If array is inactive, we can reduce the component size, but
2761 * not increase it (except from 0).
2762 * If array is active, we can try an on-line resize
2766 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2767 if (!*buf
|| *buf
== '\n' ||
2772 err
= update_size(mddev
, size
);
2773 md_update_sb(mddev
, 1);
2775 if (mddev
->size
== 0 ||
2781 return err
? err
: len
;
2784 static struct md_sysfs_entry md_size
=
2785 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2790 * 'none' for arrays with no metadata (good luck...)
2791 * 'external' for arrays with externally managed metadata,
2792 * or N.M for internally known formats
2795 metadata_show(mddev_t
*mddev
, char *page
)
2797 if (mddev
->persistent
)
2798 return sprintf(page
, "%d.%d\n",
2799 mddev
->major_version
, mddev
->minor_version
);
2800 else if (mddev
->external
)
2801 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
2803 return sprintf(page
, "none\n");
2807 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2811 if (!list_empty(&mddev
->disks
))
2814 if (cmd_match(buf
, "none")) {
2815 mddev
->persistent
= 0;
2816 mddev
->external
= 0;
2817 mddev
->major_version
= 0;
2818 mddev
->minor_version
= 90;
2821 if (strncmp(buf
, "external:", 9) == 0) {
2822 size_t namelen
= len
-9;
2823 if (namelen
>= sizeof(mddev
->metadata_type
))
2824 namelen
= sizeof(mddev
->metadata_type
)-1;
2825 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
2826 mddev
->metadata_type
[namelen
] = 0;
2827 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
2828 mddev
->metadata_type
[--namelen
] = 0;
2829 mddev
->persistent
= 0;
2830 mddev
->external
= 1;
2831 mddev
->major_version
= 0;
2832 mddev
->minor_version
= 90;
2835 major
= simple_strtoul(buf
, &e
, 10);
2836 if (e
==buf
|| *e
!= '.')
2839 minor
= simple_strtoul(buf
, &e
, 10);
2840 if (e
==buf
|| (*e
&& *e
!= '\n') )
2842 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
2844 mddev
->major_version
= major
;
2845 mddev
->minor_version
= minor
;
2846 mddev
->persistent
= 1;
2847 mddev
->external
= 0;
2851 static struct md_sysfs_entry md_metadata
=
2852 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2855 action_show(mddev_t
*mddev
, char *page
)
2857 char *type
= "idle";
2858 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2859 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
2860 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2862 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2863 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2865 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2872 return sprintf(page
, "%s\n", type
);
2876 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2878 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2881 if (cmd_match(page
, "idle")) {
2882 if (mddev
->sync_thread
) {
2883 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2884 md_unregister_thread(mddev
->sync_thread
);
2885 mddev
->sync_thread
= NULL
;
2886 mddev
->recovery
= 0;
2888 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2889 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2891 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2892 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2893 else if (cmd_match(page
, "reshape")) {
2895 if (mddev
->pers
->start_reshape
== NULL
)
2897 err
= mddev
->pers
->start_reshape(mddev
);
2901 if (cmd_match(page
, "check"))
2902 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2903 else if (!cmd_match(page
, "repair"))
2905 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2906 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2908 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2909 md_wakeup_thread(mddev
->thread
);
2914 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2916 return sprintf(page
, "%llu\n",
2917 (unsigned long long) mddev
->resync_mismatches
);
2920 static struct md_sysfs_entry md_scan_mode
=
2921 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2924 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
2927 sync_min_show(mddev_t
*mddev
, char *page
)
2929 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2930 mddev
->sync_speed_min
? "local": "system");
2934 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2938 if (strncmp(buf
, "system", 6)==0) {
2939 mddev
->sync_speed_min
= 0;
2942 min
= simple_strtoul(buf
, &e
, 10);
2943 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2945 mddev
->sync_speed_min
= min
;
2949 static struct md_sysfs_entry md_sync_min
=
2950 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2953 sync_max_show(mddev_t
*mddev
, char *page
)
2955 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2956 mddev
->sync_speed_max
? "local": "system");
2960 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2964 if (strncmp(buf
, "system", 6)==0) {
2965 mddev
->sync_speed_max
= 0;
2968 max
= simple_strtoul(buf
, &e
, 10);
2969 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2971 mddev
->sync_speed_max
= max
;
2975 static struct md_sysfs_entry md_sync_max
=
2976 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2979 degraded_show(mddev_t
*mddev
, char *page
)
2981 return sprintf(page
, "%d\n", mddev
->degraded
);
2983 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
2986 sync_speed_show(mddev_t
*mddev
, char *page
)
2988 unsigned long resync
, dt
, db
;
2989 resync
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
));
2990 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2992 db
= resync
- (mddev
->resync_mark_cnt
);
2993 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2996 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
2999 sync_completed_show(mddev_t
*mddev
, char *page
)
3001 unsigned long max_blocks
, resync
;
3003 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3004 max_blocks
= mddev
->resync_max_sectors
;
3006 max_blocks
= mddev
->size
<< 1;
3008 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3009 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3012 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3015 max_sync_show(mddev_t
*mddev
, char *page
)
3017 if (mddev
->resync_max
== MaxSector
)
3018 return sprintf(page
, "max\n");
3020 return sprintf(page
, "%llu\n",
3021 (unsigned long long)mddev
->resync_max
);
3024 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3026 if (strncmp(buf
, "max", 3) == 0)
3027 mddev
->resync_max
= MaxSector
;
3030 unsigned long long max
= simple_strtoull(buf
, &ep
, 10);
3031 if (ep
== buf
|| (*ep
!= 0 && *ep
!= '\n'))
3033 if (max
< mddev
->resync_max
&&
3034 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3037 /* Must be a multiple of chunk_size */
3038 if (mddev
->chunk_size
) {
3039 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3042 mddev
->resync_max
= max
;
3044 wake_up(&mddev
->recovery_wait
);
3048 static struct md_sysfs_entry md_max_sync
=
3049 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3052 suspend_lo_show(mddev_t
*mddev
, char *page
)
3054 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3058 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3061 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3063 if (mddev
->pers
->quiesce
== NULL
)
3065 if (buf
== e
|| (*e
&& *e
!= '\n'))
3067 if (new >= mddev
->suspend_hi
||
3068 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3069 mddev
->suspend_lo
= new;
3070 mddev
->pers
->quiesce(mddev
, 2);
3075 static struct md_sysfs_entry md_suspend_lo
=
3076 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3080 suspend_hi_show(mddev_t
*mddev
, char *page
)
3082 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3086 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3089 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3091 if (mddev
->pers
->quiesce
== NULL
)
3093 if (buf
== e
|| (*e
&& *e
!= '\n'))
3095 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3096 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3097 mddev
->suspend_hi
= new;
3098 mddev
->pers
->quiesce(mddev
, 1);
3099 mddev
->pers
->quiesce(mddev
, 0);
3104 static struct md_sysfs_entry md_suspend_hi
=
3105 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3108 reshape_position_show(mddev_t
*mddev
, char *page
)
3110 if (mddev
->reshape_position
!= MaxSector
)
3111 return sprintf(page
, "%llu\n",
3112 (unsigned long long)mddev
->reshape_position
);
3113 strcpy(page
, "none\n");
3118 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3121 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3124 if (buf
== e
|| (*e
&& *e
!= '\n'))
3126 mddev
->reshape_position
= new;
3127 mddev
->delta_disks
= 0;
3128 mddev
->new_level
= mddev
->level
;
3129 mddev
->new_layout
= mddev
->layout
;
3130 mddev
->new_chunk
= mddev
->chunk_size
;
3134 static struct md_sysfs_entry md_reshape_position
=
3135 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3136 reshape_position_store
);
3139 static struct attribute
*md_default_attrs
[] = {
3142 &md_raid_disks
.attr
,
3143 &md_chunk_size
.attr
,
3145 &md_resync_start
.attr
,
3147 &md_new_device
.attr
,
3148 &md_safe_delay
.attr
,
3149 &md_array_state
.attr
,
3150 &md_reshape_position
.attr
,
3154 static struct attribute
*md_redundancy_attrs
[] = {
3156 &md_mismatches
.attr
,
3159 &md_sync_speed
.attr
,
3160 &md_sync_completed
.attr
,
3162 &md_suspend_lo
.attr
,
3163 &md_suspend_hi
.attr
,
3168 static struct attribute_group md_redundancy_group
= {
3170 .attrs
= md_redundancy_attrs
,
3175 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3177 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3178 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3183 rv
= mddev_lock(mddev
);
3185 rv
= entry
->show(mddev
, page
);
3186 mddev_unlock(mddev
);
3192 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3193 const char *page
, size_t length
)
3195 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3196 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3201 if (!capable(CAP_SYS_ADMIN
))
3203 rv
= mddev_lock(mddev
);
3205 rv
= entry
->store(mddev
, page
, length
);
3206 mddev_unlock(mddev
);
3211 static void md_free(struct kobject
*ko
)
3213 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3217 static struct sysfs_ops md_sysfs_ops
= {
3218 .show
= md_attr_show
,
3219 .store
= md_attr_store
,
3221 static struct kobj_type md_ktype
= {
3223 .sysfs_ops
= &md_sysfs_ops
,
3224 .default_attrs
= md_default_attrs
,
3229 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3231 static DEFINE_MUTEX(disks_mutex
);
3232 mddev_t
*mddev
= mddev_find(dev
);
3233 struct gendisk
*disk
;
3234 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3235 int shift
= partitioned
? MdpMinorShift
: 0;
3236 int unit
= MINOR(dev
) >> shift
;
3242 mutex_lock(&disks_mutex
);
3243 if (mddev
->gendisk
) {
3244 mutex_unlock(&disks_mutex
);
3248 disk
= alloc_disk(1 << shift
);
3250 mutex_unlock(&disks_mutex
);
3254 disk
->major
= MAJOR(dev
);
3255 disk
->first_minor
= unit
<< shift
;
3257 sprintf(disk
->disk_name
, "md_d%d", unit
);
3259 sprintf(disk
->disk_name
, "md%d", unit
);
3260 disk
->fops
= &md_fops
;
3261 disk
->private_data
= mddev
;
3262 disk
->queue
= mddev
->queue
;
3264 mddev
->gendisk
= disk
;
3265 mutex_unlock(&disks_mutex
);
3266 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
, &disk
->dev
.kobj
,
3269 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3272 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3276 static void md_safemode_timeout(unsigned long data
)
3278 mddev_t
*mddev
= (mddev_t
*) data
;
3280 mddev
->safemode
= 1;
3281 md_wakeup_thread(mddev
->thread
);
3284 static int start_dirty_degraded
;
3286 static int do_md_run(mddev_t
* mddev
)
3290 struct list_head
*tmp
;
3292 struct gendisk
*disk
;
3293 struct mdk_personality
*pers
;
3294 char b
[BDEVNAME_SIZE
];
3296 if (list_empty(&mddev
->disks
))
3297 /* cannot run an array with no devices.. */
3304 * Analyze all RAID superblock(s)
3306 if (!mddev
->raid_disks
) {
3307 if (!mddev
->persistent
)
3312 chunk_size
= mddev
->chunk_size
;
3315 if (chunk_size
> MAX_CHUNK_SIZE
) {
3316 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3317 chunk_size
, MAX_CHUNK_SIZE
);
3321 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3323 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3324 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3327 if (chunk_size
< PAGE_SIZE
) {
3328 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3329 chunk_size
, PAGE_SIZE
);
3333 /* devices must have minimum size of one chunk */
3334 rdev_for_each(rdev
, tmp
, mddev
) {
3335 if (test_bit(Faulty
, &rdev
->flags
))
3337 if (rdev
->size
< chunk_size
/ 1024) {
3339 "md: Dev %s smaller than chunk_size:"
3341 bdevname(rdev
->bdev
,b
),
3342 (unsigned long long)rdev
->size
,
3350 if (mddev
->level
!= LEVEL_NONE
)
3351 request_module("md-level-%d", mddev
->level
);
3352 else if (mddev
->clevel
[0])
3353 request_module("md-%s", mddev
->clevel
);
3357 * Drop all container device buffers, from now on
3358 * the only valid external interface is through the md
3361 rdev_for_each(rdev
, tmp
, mddev
) {
3362 if (test_bit(Faulty
, &rdev
->flags
))
3364 sync_blockdev(rdev
->bdev
);
3365 invalidate_bdev(rdev
->bdev
);
3367 /* perform some consistency tests on the device.
3368 * We don't want the data to overlap the metadata,
3369 * Internal Bitmap issues has handled elsewhere.
3371 if (rdev
->data_offset
< rdev
->sb_offset
) {
3373 rdev
->data_offset
+ mddev
->size
*2
3374 > rdev
->sb_offset
*2) {
3375 printk("md: %s: data overlaps metadata\n",
3380 if (rdev
->sb_offset
*2 + rdev
->sb_size
/512
3381 > rdev
->data_offset
) {
3382 printk("md: %s: metadata overlaps data\n",
3389 md_probe(mddev
->unit
, NULL
, NULL
);
3390 disk
= mddev
->gendisk
;
3394 spin_lock(&pers_lock
);
3395 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3396 if (!pers
|| !try_module_get(pers
->owner
)) {
3397 spin_unlock(&pers_lock
);
3398 if (mddev
->level
!= LEVEL_NONE
)
3399 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3402 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3407 spin_unlock(&pers_lock
);
3408 mddev
->level
= pers
->level
;
3409 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3411 if (mddev
->reshape_position
!= MaxSector
&&
3412 pers
->start_reshape
== NULL
) {
3413 /* This personality cannot handle reshaping... */
3415 module_put(pers
->owner
);
3419 if (pers
->sync_request
) {
3420 /* Warn if this is a potentially silly
3423 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3425 struct list_head
*tmp2
;
3427 rdev_for_each(rdev
, tmp
, mddev
) {
3428 rdev_for_each(rdev2
, tmp2
, mddev
) {
3430 rdev
->bdev
->bd_contains
==
3431 rdev2
->bdev
->bd_contains
) {
3433 "%s: WARNING: %s appears to be"
3434 " on the same physical disk as"
3437 bdevname(rdev
->bdev
,b
),
3438 bdevname(rdev2
->bdev
,b2
));
3445 "True protection against single-disk"
3446 " failure might be compromised.\n");
3449 mddev
->recovery
= 0;
3450 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3451 mddev
->barriers_work
= 1;
3452 mddev
->ok_start_degraded
= start_dirty_degraded
;
3455 mddev
->ro
= 2; /* read-only, but switch on first write */
3457 err
= mddev
->pers
->run(mddev
);
3458 if (!err
&& mddev
->pers
->sync_request
) {
3459 err
= bitmap_create(mddev
);
3461 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3462 mdname(mddev
), err
);
3463 mddev
->pers
->stop(mddev
);
3467 printk(KERN_ERR
"md: pers->run() failed ...\n");
3468 module_put(mddev
->pers
->owner
);
3470 bitmap_destroy(mddev
);
3473 if (mddev
->pers
->sync_request
) {
3474 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3476 "md: cannot register extra attributes for %s\n",
3478 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3481 atomic_set(&mddev
->writes_pending
,0);
3482 mddev
->safemode
= 0;
3483 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3484 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3485 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3488 rdev_for_each(rdev
, tmp
, mddev
)
3489 if (rdev
->raid_disk
>= 0) {
3491 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3492 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3493 printk("md: cannot register %s for %s\n",
3497 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3500 md_update_sb(mddev
, 0);
3502 set_capacity(disk
, mddev
->array_size
<<1);
3504 /* If we call blk_queue_make_request here, it will
3505 * re-initialise max_sectors etc which may have been
3506 * refined inside -> run. So just set the bits we need to set.
3507 * Most initialisation happended when we called
3508 * blk_queue_make_request(..., md_fail_request)
3511 mddev
->queue
->queuedata
= mddev
;
3512 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3514 /* If there is a partially-recovered drive we need to
3515 * start recovery here. If we leave it to md_check_recovery,
3516 * it will remove the drives and not do the right thing
3518 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3519 struct list_head
*rtmp
;
3521 rdev_for_each(rdev
, rtmp
, mddev
)
3522 if (rdev
->raid_disk
>= 0 &&
3523 !test_bit(In_sync
, &rdev
->flags
) &&
3524 !test_bit(Faulty
, &rdev
->flags
))
3525 /* complete an interrupted recovery */
3527 if (spares
&& mddev
->pers
->sync_request
) {
3528 mddev
->recovery
= 0;
3529 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3530 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3533 if (!mddev
->sync_thread
) {
3534 printk(KERN_ERR
"%s: could not start resync"
3537 /* leave the spares where they are, it shouldn't hurt */
3538 mddev
->recovery
= 0;
3542 md_wakeup_thread(mddev
->thread
);
3543 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3546 md_new_event(mddev
);
3547 kobject_uevent(&mddev
->gendisk
->dev
.kobj
, KOBJ_CHANGE
);
3551 static int restart_array(mddev_t
*mddev
)
3553 struct gendisk
*disk
= mddev
->gendisk
;
3557 * Complain if it has no devices
3560 if (list_empty(&mddev
->disks
))
3568 mddev
->safemode
= 0;
3570 set_disk_ro(disk
, 0);
3572 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3575 * Kick recovery or resync if necessary
3577 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3578 md_wakeup_thread(mddev
->thread
);
3579 md_wakeup_thread(mddev
->sync_thread
);
3588 /* similar to deny_write_access, but accounts for our holding a reference
3589 * to the file ourselves */
3590 static int deny_bitmap_write_access(struct file
* file
)
3592 struct inode
*inode
= file
->f_mapping
->host
;
3594 spin_lock(&inode
->i_lock
);
3595 if (atomic_read(&inode
->i_writecount
) > 1) {
3596 spin_unlock(&inode
->i_lock
);
3599 atomic_set(&inode
->i_writecount
, -1);
3600 spin_unlock(&inode
->i_lock
);
3605 static void restore_bitmap_write_access(struct file
*file
)
3607 struct inode
*inode
= file
->f_mapping
->host
;
3609 spin_lock(&inode
->i_lock
);
3610 atomic_set(&inode
->i_writecount
, 1);
3611 spin_unlock(&inode
->i_lock
);
3615 * 0 - completely stop and dis-assemble array
3616 * 1 - switch to readonly
3617 * 2 - stop but do not disassemble array
3619 static int do_md_stop(mddev_t
* mddev
, int mode
)
3622 struct gendisk
*disk
= mddev
->gendisk
;
3625 if (atomic_read(&mddev
->active
)>2) {
3626 printk("md: %s still in use.\n",mdname(mddev
));
3630 if (mddev
->sync_thread
) {
3631 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3632 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3633 md_unregister_thread(mddev
->sync_thread
);
3634 mddev
->sync_thread
= NULL
;
3637 del_timer_sync(&mddev
->safemode_timer
);
3639 invalidate_partition(disk
, 0);
3642 case 1: /* readonly */
3648 case 0: /* disassemble */
3650 bitmap_flush(mddev
);
3651 md_super_wait(mddev
);
3653 set_disk_ro(disk
, 0);
3654 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3655 mddev
->pers
->stop(mddev
);
3656 mddev
->queue
->merge_bvec_fn
= NULL
;
3657 mddev
->queue
->unplug_fn
= NULL
;
3658 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3659 if (mddev
->pers
->sync_request
)
3660 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3662 module_put(mddev
->pers
->owner
);
3665 set_capacity(disk
, 0);
3671 if (!mddev
->in_sync
|| mddev
->flags
) {
3672 /* mark array as shutdown cleanly */
3674 md_update_sb(mddev
, 1);
3677 set_disk_ro(disk
, 1);
3678 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3682 * Free resources if final stop
3686 struct list_head
*tmp
;
3688 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3690 bitmap_destroy(mddev
);
3691 if (mddev
->bitmap_file
) {
3692 restore_bitmap_write_access(mddev
->bitmap_file
);
3693 fput(mddev
->bitmap_file
);
3694 mddev
->bitmap_file
= NULL
;
3696 mddev
->bitmap_offset
= 0;
3698 rdev_for_each(rdev
, tmp
, mddev
)
3699 if (rdev
->raid_disk
>= 0) {
3701 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3702 sysfs_remove_link(&mddev
->kobj
, nm
);
3705 /* make sure all md_delayed_delete calls have finished */
3706 flush_scheduled_work();
3708 export_array(mddev
);
3710 mddev
->array_size
= 0;
3712 mddev
->raid_disks
= 0;
3713 mddev
->recovery_cp
= 0;
3714 mddev
->resync_max
= MaxSector
;
3715 mddev
->reshape_position
= MaxSector
;
3716 mddev
->external
= 0;
3717 mddev
->persistent
= 0;
3718 mddev
->level
= LEVEL_NONE
;
3719 mddev
->clevel
[0] = 0;
3722 mddev
->metadata_type
[0] = 0;
3723 mddev
->chunk_size
= 0;
3724 mddev
->ctime
= mddev
->utime
= 0;
3726 mddev
->max_disks
= 0;
3728 mddev
->delta_disks
= 0;
3729 mddev
->new_level
= LEVEL_NONE
;
3730 mddev
->new_layout
= 0;
3731 mddev
->new_chunk
= 0;
3732 mddev
->curr_resync
= 0;
3733 mddev
->resync_mismatches
= 0;
3734 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
3735 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
3736 mddev
->recovery
= 0;
3739 mddev
->degraded
= 0;
3740 mddev
->barriers_work
= 0;
3741 mddev
->safemode
= 0;
3743 } else if (mddev
->pers
)
3744 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3747 md_new_event(mddev
);
3753 static void autorun_array(mddev_t
*mddev
)
3756 struct list_head
*tmp
;
3759 if (list_empty(&mddev
->disks
))
3762 printk(KERN_INFO
"md: running: ");
3764 rdev_for_each(rdev
, tmp
, mddev
) {
3765 char b
[BDEVNAME_SIZE
];
3766 printk("<%s>", bdevname(rdev
->bdev
,b
));
3770 err
= do_md_run (mddev
);
3772 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3773 do_md_stop (mddev
, 0);
3778 * lets try to run arrays based on all disks that have arrived
3779 * until now. (those are in pending_raid_disks)
3781 * the method: pick the first pending disk, collect all disks with
3782 * the same UUID, remove all from the pending list and put them into
3783 * the 'same_array' list. Then order this list based on superblock
3784 * update time (freshest comes first), kick out 'old' disks and
3785 * compare superblocks. If everything's fine then run it.
3787 * If "unit" is allocated, then bump its reference count
3789 static void autorun_devices(int part
)
3791 struct list_head
*tmp
;
3792 mdk_rdev_t
*rdev0
, *rdev
;
3794 char b
[BDEVNAME_SIZE
];
3796 printk(KERN_INFO
"md: autorun ...\n");
3797 while (!list_empty(&pending_raid_disks
)) {
3800 LIST_HEAD(candidates
);
3801 rdev0
= list_entry(pending_raid_disks
.next
,
3802 mdk_rdev_t
, same_set
);
3804 printk(KERN_INFO
"md: considering %s ...\n",
3805 bdevname(rdev0
->bdev
,b
));
3806 INIT_LIST_HEAD(&candidates
);
3807 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
)
3808 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3809 printk(KERN_INFO
"md: adding %s ...\n",
3810 bdevname(rdev
->bdev
,b
));
3811 list_move(&rdev
->same_set
, &candidates
);
3814 * now we have a set of devices, with all of them having
3815 * mostly sane superblocks. It's time to allocate the
3819 dev
= MKDEV(mdp_major
,
3820 rdev0
->preferred_minor
<< MdpMinorShift
);
3821 unit
= MINOR(dev
) >> MdpMinorShift
;
3823 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
3826 if (rdev0
->preferred_minor
!= unit
) {
3827 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
3828 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
3832 md_probe(dev
, NULL
, NULL
);
3833 mddev
= mddev_find(dev
);
3836 "md: cannot allocate memory for md drive.\n");
3839 if (mddev_lock(mddev
))
3840 printk(KERN_WARNING
"md: %s locked, cannot run\n",
3842 else if (mddev
->raid_disks
|| mddev
->major_version
3843 || !list_empty(&mddev
->disks
)) {
3845 "md: %s already running, cannot run %s\n",
3846 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
3847 mddev_unlock(mddev
);
3849 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
3850 mddev
->persistent
= 1;
3851 rdev_for_each_list(rdev
, tmp
, candidates
) {
3852 list_del_init(&rdev
->same_set
);
3853 if (bind_rdev_to_array(rdev
, mddev
))
3856 autorun_array(mddev
);
3857 mddev_unlock(mddev
);
3859 /* on success, candidates will be empty, on error
3862 rdev_for_each_list(rdev
, tmp
, candidates
)
3866 printk(KERN_INFO
"md: ... autorun DONE.\n");
3868 #endif /* !MODULE */
3870 static int get_version(void __user
* arg
)
3874 ver
.major
= MD_MAJOR_VERSION
;
3875 ver
.minor
= MD_MINOR_VERSION
;
3876 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3878 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3884 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3886 mdu_array_info_t info
;
3887 int nr
,working
,active
,failed
,spare
;
3889 struct list_head
*tmp
;
3891 nr
=working
=active
=failed
=spare
=0;
3892 rdev_for_each(rdev
, tmp
, mddev
) {
3894 if (test_bit(Faulty
, &rdev
->flags
))
3898 if (test_bit(In_sync
, &rdev
->flags
))
3905 info
.major_version
= mddev
->major_version
;
3906 info
.minor_version
= mddev
->minor_version
;
3907 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3908 info
.ctime
= mddev
->ctime
;
3909 info
.level
= mddev
->level
;
3910 info
.size
= mddev
->size
;
3911 if (info
.size
!= mddev
->size
) /* overflow */
3914 info
.raid_disks
= mddev
->raid_disks
;
3915 info
.md_minor
= mddev
->md_minor
;
3916 info
.not_persistent
= !mddev
->persistent
;
3918 info
.utime
= mddev
->utime
;
3921 info
.state
= (1<<MD_SB_CLEAN
);
3922 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3923 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3924 info
.active_disks
= active
;
3925 info
.working_disks
= working
;
3926 info
.failed_disks
= failed
;
3927 info
.spare_disks
= spare
;
3929 info
.layout
= mddev
->layout
;
3930 info
.chunk_size
= mddev
->chunk_size
;
3932 if (copy_to_user(arg
, &info
, sizeof(info
)))
3938 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3940 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3941 char *ptr
, *buf
= NULL
;
3944 md_allow_write(mddev
);
3946 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3950 /* bitmap disabled, zero the first byte and copy out */
3951 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3952 file
->pathname
[0] = '\0';
3956 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3960 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3964 strcpy(file
->pathname
, ptr
);
3968 if (copy_to_user(arg
, file
, sizeof(*file
)))
3976 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3978 mdu_disk_info_t info
;
3982 if (copy_from_user(&info
, arg
, sizeof(info
)))
3987 rdev
= find_rdev_nr(mddev
, nr
);
3989 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3990 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3991 info
.raid_disk
= rdev
->raid_disk
;
3993 if (test_bit(Faulty
, &rdev
->flags
))
3994 info
.state
|= (1<<MD_DISK_FAULTY
);
3995 else if (test_bit(In_sync
, &rdev
->flags
)) {
3996 info
.state
|= (1<<MD_DISK_ACTIVE
);
3997 info
.state
|= (1<<MD_DISK_SYNC
);
3999 if (test_bit(WriteMostly
, &rdev
->flags
))
4000 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4002 info
.major
= info
.minor
= 0;
4003 info
.raid_disk
= -1;
4004 info
.state
= (1<<MD_DISK_REMOVED
);
4007 if (copy_to_user(arg
, &info
, sizeof(info
)))
4013 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4015 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4017 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4019 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4022 if (!mddev
->raid_disks
) {
4024 /* expecting a device which has a superblock */
4025 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4028 "md: md_import_device returned %ld\n",
4030 return PTR_ERR(rdev
);
4032 if (!list_empty(&mddev
->disks
)) {
4033 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4034 mdk_rdev_t
, same_set
);
4035 int err
= super_types
[mddev
->major_version
]
4036 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4039 "md: %s has different UUID to %s\n",
4040 bdevname(rdev
->bdev
,b
),
4041 bdevname(rdev0
->bdev
,b2
));
4046 err
= bind_rdev_to_array(rdev
, mddev
);
4053 * add_new_disk can be used once the array is assembled
4054 * to add "hot spares". They must already have a superblock
4059 if (!mddev
->pers
->hot_add_disk
) {
4061 "%s: personality does not support diskops!\n",
4065 if (mddev
->persistent
)
4066 rdev
= md_import_device(dev
, mddev
->major_version
,
4067 mddev
->minor_version
);
4069 rdev
= md_import_device(dev
, -1, -1);
4072 "md: md_import_device returned %ld\n",
4074 return PTR_ERR(rdev
);
4076 /* set save_raid_disk if appropriate */
4077 if (!mddev
->persistent
) {
4078 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4079 info
->raid_disk
< mddev
->raid_disks
)
4080 rdev
->raid_disk
= info
->raid_disk
;
4082 rdev
->raid_disk
= -1;
4084 super_types
[mddev
->major_version
].
4085 validate_super(mddev
, rdev
);
4086 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4088 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4089 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4090 set_bit(WriteMostly
, &rdev
->flags
);
4092 rdev
->raid_disk
= -1;
4093 err
= bind_rdev_to_array(rdev
, mddev
);
4094 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4095 /* If there is hot_add_disk but no hot_remove_disk
4096 * then added disks for geometry changes,
4097 * and should be added immediately.
4099 super_types
[mddev
->major_version
].
4100 validate_super(mddev
, rdev
);
4101 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4103 unbind_rdev_from_array(rdev
);
4108 md_update_sb(mddev
, 1);
4109 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4110 md_wakeup_thread(mddev
->thread
);
4114 /* otherwise, add_new_disk is only allowed
4115 * for major_version==0 superblocks
4117 if (mddev
->major_version
!= 0) {
4118 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4123 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4125 rdev
= md_import_device (dev
, -1, 0);
4128 "md: error, md_import_device() returned %ld\n",
4130 return PTR_ERR(rdev
);
4132 rdev
->desc_nr
= info
->number
;
4133 if (info
->raid_disk
< mddev
->raid_disks
)
4134 rdev
->raid_disk
= info
->raid_disk
;
4136 rdev
->raid_disk
= -1;
4138 if (rdev
->raid_disk
< mddev
->raid_disks
)
4139 if (info
->state
& (1<<MD_DISK_SYNC
))
4140 set_bit(In_sync
, &rdev
->flags
);
4142 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4143 set_bit(WriteMostly
, &rdev
->flags
);
4145 if (!mddev
->persistent
) {
4146 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4147 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
4149 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
4150 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4152 err
= bind_rdev_to_array(rdev
, mddev
);
4162 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4164 char b
[BDEVNAME_SIZE
];
4170 rdev
= find_rdev(mddev
, dev
);
4174 if (rdev
->raid_disk
>= 0)
4177 kick_rdev_from_array(rdev
);
4178 md_update_sb(mddev
, 1);
4179 md_new_event(mddev
);
4183 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4184 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4188 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4190 char b
[BDEVNAME_SIZE
];
4198 if (mddev
->major_version
!= 0) {
4199 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4200 " version-0 superblocks.\n",
4204 if (!mddev
->pers
->hot_add_disk
) {
4206 "%s: personality does not support diskops!\n",
4211 rdev
= md_import_device (dev
, -1, 0);
4214 "md: error, md_import_device() returned %ld\n",
4219 if (mddev
->persistent
)
4220 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
4223 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
4225 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
4228 if (test_bit(Faulty
, &rdev
->flags
)) {
4230 "md: can not hot-add faulty %s disk to %s!\n",
4231 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4235 clear_bit(In_sync
, &rdev
->flags
);
4237 rdev
->saved_raid_disk
= -1;
4238 err
= bind_rdev_to_array(rdev
, mddev
);
4243 * The rest should better be atomic, we can have disk failures
4244 * noticed in interrupt contexts ...
4247 if (rdev
->desc_nr
== mddev
->max_disks
) {
4248 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4251 goto abort_unbind_export
;
4254 rdev
->raid_disk
= -1;
4256 md_update_sb(mddev
, 1);
4259 * Kick recovery, maybe this spare has to be added to the
4260 * array immediately.
4262 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4263 md_wakeup_thread(mddev
->thread
);
4264 md_new_event(mddev
);
4267 abort_unbind_export
:
4268 unbind_rdev_from_array(rdev
);
4275 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4280 if (!mddev
->pers
->quiesce
)
4282 if (mddev
->recovery
|| mddev
->sync_thread
)
4284 /* we should be able to change the bitmap.. */
4290 return -EEXIST
; /* cannot add when bitmap is present */
4291 mddev
->bitmap_file
= fget(fd
);
4293 if (mddev
->bitmap_file
== NULL
) {
4294 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4299 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4301 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4303 fput(mddev
->bitmap_file
);
4304 mddev
->bitmap_file
= NULL
;
4307 mddev
->bitmap_offset
= 0; /* file overrides offset */
4308 } else if (mddev
->bitmap
== NULL
)
4309 return -ENOENT
; /* cannot remove what isn't there */
4312 mddev
->pers
->quiesce(mddev
, 1);
4314 err
= bitmap_create(mddev
);
4315 if (fd
< 0 || err
) {
4316 bitmap_destroy(mddev
);
4317 fd
= -1; /* make sure to put the file */
4319 mddev
->pers
->quiesce(mddev
, 0);
4322 if (mddev
->bitmap_file
) {
4323 restore_bitmap_write_access(mddev
->bitmap_file
);
4324 fput(mddev
->bitmap_file
);
4326 mddev
->bitmap_file
= NULL
;
4333 * set_array_info is used two different ways
4334 * The original usage is when creating a new array.
4335 * In this usage, raid_disks is > 0 and it together with
4336 * level, size, not_persistent,layout,chunksize determine the
4337 * shape of the array.
4338 * This will always create an array with a type-0.90.0 superblock.
4339 * The newer usage is when assembling an array.
4340 * In this case raid_disks will be 0, and the major_version field is
4341 * use to determine which style super-blocks are to be found on the devices.
4342 * The minor and patch _version numbers are also kept incase the
4343 * super_block handler wishes to interpret them.
4345 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4348 if (info
->raid_disks
== 0) {
4349 /* just setting version number for superblock loading */
4350 if (info
->major_version
< 0 ||
4351 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4352 super_types
[info
->major_version
].name
== NULL
) {
4353 /* maybe try to auto-load a module? */
4355 "md: superblock version %d not known\n",
4356 info
->major_version
);
4359 mddev
->major_version
= info
->major_version
;
4360 mddev
->minor_version
= info
->minor_version
;
4361 mddev
->patch_version
= info
->patch_version
;
4362 mddev
->persistent
= !info
->not_persistent
;
4365 mddev
->major_version
= MD_MAJOR_VERSION
;
4366 mddev
->minor_version
= MD_MINOR_VERSION
;
4367 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4368 mddev
->ctime
= get_seconds();
4370 mddev
->level
= info
->level
;
4371 mddev
->clevel
[0] = 0;
4372 mddev
->size
= info
->size
;
4373 mddev
->raid_disks
= info
->raid_disks
;
4374 /* don't set md_minor, it is determined by which /dev/md* was
4377 if (info
->state
& (1<<MD_SB_CLEAN
))
4378 mddev
->recovery_cp
= MaxSector
;
4380 mddev
->recovery_cp
= 0;
4381 mddev
->persistent
= ! info
->not_persistent
;
4382 mddev
->external
= 0;
4384 mddev
->layout
= info
->layout
;
4385 mddev
->chunk_size
= info
->chunk_size
;
4387 mddev
->max_disks
= MD_SB_DISKS
;
4389 if (mddev
->persistent
)
4391 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4393 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4394 mddev
->bitmap_offset
= 0;
4396 mddev
->reshape_position
= MaxSector
;
4399 * Generate a 128 bit UUID
4401 get_random_bytes(mddev
->uuid
, 16);
4403 mddev
->new_level
= mddev
->level
;
4404 mddev
->new_chunk
= mddev
->chunk_size
;
4405 mddev
->new_layout
= mddev
->layout
;
4406 mddev
->delta_disks
= 0;
4411 static int update_size(mddev_t
*mddev
, unsigned long size
)
4415 struct list_head
*tmp
;
4416 int fit
= (size
== 0);
4418 if (mddev
->pers
->resize
== NULL
)
4420 /* The "size" is the amount of each device that is used.
4421 * This can only make sense for arrays with redundancy.
4422 * linear and raid0 always use whatever space is available
4423 * We can only consider changing the size if no resync
4424 * or reconstruction is happening, and if the new size
4425 * is acceptable. It must fit before the sb_offset or,
4426 * if that is <data_offset, it must fit before the
4427 * size of each device.
4428 * If size is zero, we find the largest size that fits.
4430 if (mddev
->sync_thread
)
4432 rdev_for_each(rdev
, tmp
, mddev
) {
4434 avail
= rdev
->size
* 2;
4436 if (fit
&& (size
== 0 || size
> avail
/2))
4438 if (avail
< ((sector_t
)size
<< 1))
4441 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4443 struct block_device
*bdev
;
4445 bdev
= bdget_disk(mddev
->gendisk
, 0);
4447 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4448 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4449 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4456 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4459 /* change the number of raid disks */
4460 if (mddev
->pers
->check_reshape
== NULL
)
4462 if (raid_disks
<= 0 ||
4463 raid_disks
>= mddev
->max_disks
)
4465 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4467 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4469 rv
= mddev
->pers
->check_reshape(mddev
);
4475 * update_array_info is used to change the configuration of an
4477 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4478 * fields in the info are checked against the array.
4479 * Any differences that cannot be handled will cause an error.
4480 * Normally, only one change can be managed at a time.
4482 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4488 /* calculate expected state,ignoring low bits */
4489 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4490 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4492 if (mddev
->major_version
!= info
->major_version
||
4493 mddev
->minor_version
!= info
->minor_version
||
4494 /* mddev->patch_version != info->patch_version || */
4495 mddev
->ctime
!= info
->ctime
||
4496 mddev
->level
!= info
->level
||
4497 /* mddev->layout != info->layout || */
4498 !mddev
->persistent
!= info
->not_persistent
||
4499 mddev
->chunk_size
!= info
->chunk_size
||
4500 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4501 ((state
^info
->state
) & 0xfffffe00)
4504 /* Check there is only one change */
4505 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4506 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4507 if (mddev
->layout
!= info
->layout
) cnt
++;
4508 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4509 if (cnt
== 0) return 0;
4510 if (cnt
> 1) return -EINVAL
;
4512 if (mddev
->layout
!= info
->layout
) {
4514 * we don't need to do anything at the md level, the
4515 * personality will take care of it all.
4517 if (mddev
->pers
->reconfig
== NULL
)
4520 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4522 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4523 rv
= update_size(mddev
, info
->size
);
4525 if (mddev
->raid_disks
!= info
->raid_disks
)
4526 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4528 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4529 if (mddev
->pers
->quiesce
== NULL
)
4531 if (mddev
->recovery
|| mddev
->sync_thread
)
4533 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4534 /* add the bitmap */
4537 if (mddev
->default_bitmap_offset
== 0)
4539 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4540 mddev
->pers
->quiesce(mddev
, 1);
4541 rv
= bitmap_create(mddev
);
4543 bitmap_destroy(mddev
);
4544 mddev
->pers
->quiesce(mddev
, 0);
4546 /* remove the bitmap */
4549 if (mddev
->bitmap
->file
)
4551 mddev
->pers
->quiesce(mddev
, 1);
4552 bitmap_destroy(mddev
);
4553 mddev
->pers
->quiesce(mddev
, 0);
4554 mddev
->bitmap_offset
= 0;
4557 md_update_sb(mddev
, 1);
4561 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4565 if (mddev
->pers
== NULL
)
4568 rdev
= find_rdev(mddev
, dev
);
4572 md_error(mddev
, rdev
);
4576 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4578 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4582 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4586 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4587 unsigned int cmd
, unsigned long arg
)
4590 void __user
*argp
= (void __user
*)arg
;
4591 mddev_t
*mddev
= NULL
;
4593 if (!capable(CAP_SYS_ADMIN
))
4597 * Commands dealing with the RAID driver but not any
4603 err
= get_version(argp
);
4606 case PRINT_RAID_DEBUG
:
4614 autostart_arrays(arg
);
4621 * Commands creating/starting a new array:
4624 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4631 err
= mddev_lock(mddev
);
4634 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4641 case SET_ARRAY_INFO
:
4643 mdu_array_info_t info
;
4645 memset(&info
, 0, sizeof(info
));
4646 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4651 err
= update_array_info(mddev
, &info
);
4653 printk(KERN_WARNING
"md: couldn't update"
4654 " array info. %d\n", err
);
4659 if (!list_empty(&mddev
->disks
)) {
4661 "md: array %s already has disks!\n",
4666 if (mddev
->raid_disks
) {
4668 "md: array %s already initialised!\n",
4673 err
= set_array_info(mddev
, &info
);
4675 printk(KERN_WARNING
"md: couldn't set"
4676 " array info. %d\n", err
);
4686 * Commands querying/configuring an existing array:
4688 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4689 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4690 if ((!mddev
->raid_disks
&& !mddev
->external
)
4691 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4692 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4693 && cmd
!= GET_BITMAP_FILE
) {
4699 * Commands even a read-only array can execute:
4703 case GET_ARRAY_INFO
:
4704 err
= get_array_info(mddev
, argp
);
4707 case GET_BITMAP_FILE
:
4708 err
= get_bitmap_file(mddev
, argp
);
4712 err
= get_disk_info(mddev
, argp
);
4715 case RESTART_ARRAY_RW
:
4716 err
= restart_array(mddev
);
4720 err
= do_md_stop (mddev
, 0);
4724 err
= do_md_stop (mddev
, 1);
4728 * We have a problem here : there is no easy way to give a CHS
4729 * virtual geometry. We currently pretend that we have a 2 heads
4730 * 4 sectors (with a BIG number of cylinders...). This drives
4731 * dosfs just mad... ;-)
4736 * The remaining ioctls are changing the state of the
4737 * superblock, so we do not allow them on read-only arrays.
4738 * However non-MD ioctls (e.g. get-size) will still come through
4739 * here and hit the 'default' below, so only disallow
4740 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4742 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
4743 mddev
->ro
&& mddev
->pers
) {
4744 if (mddev
->ro
== 2) {
4746 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4747 md_wakeup_thread(mddev
->thread
);
4759 mdu_disk_info_t info
;
4760 if (copy_from_user(&info
, argp
, sizeof(info
)))
4763 err
= add_new_disk(mddev
, &info
);
4767 case HOT_REMOVE_DISK
:
4768 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4772 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4775 case SET_DISK_FAULTY
:
4776 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4780 err
= do_md_run (mddev
);
4783 case SET_BITMAP_FILE
:
4784 err
= set_bitmap_file(mddev
, (int)arg
);
4794 mddev_unlock(mddev
);
4804 static int md_open(struct inode
*inode
, struct file
*file
)
4807 * Succeed if we can lock the mddev, which confirms that
4808 * it isn't being stopped right now.
4810 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4813 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
4818 mddev_unlock(mddev
);
4820 check_disk_change(inode
->i_bdev
);
4825 static int md_release(struct inode
*inode
, struct file
* file
)
4827 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4835 static int md_media_changed(struct gendisk
*disk
)
4837 mddev_t
*mddev
= disk
->private_data
;
4839 return mddev
->changed
;
4842 static int md_revalidate(struct gendisk
*disk
)
4844 mddev_t
*mddev
= disk
->private_data
;
4849 static struct block_device_operations md_fops
=
4851 .owner
= THIS_MODULE
,
4853 .release
= md_release
,
4855 .getgeo
= md_getgeo
,
4856 .media_changed
= md_media_changed
,
4857 .revalidate_disk
= md_revalidate
,
4860 static int md_thread(void * arg
)
4862 mdk_thread_t
*thread
= arg
;
4865 * md_thread is a 'system-thread', it's priority should be very
4866 * high. We avoid resource deadlocks individually in each
4867 * raid personality. (RAID5 does preallocation) We also use RR and
4868 * the very same RT priority as kswapd, thus we will never get
4869 * into a priority inversion deadlock.
4871 * we definitely have to have equal or higher priority than
4872 * bdflush, otherwise bdflush will deadlock if there are too
4873 * many dirty RAID5 blocks.
4876 allow_signal(SIGKILL
);
4877 while (!kthread_should_stop()) {
4879 /* We need to wait INTERRUPTIBLE so that
4880 * we don't add to the load-average.
4881 * That means we need to be sure no signals are
4884 if (signal_pending(current
))
4885 flush_signals(current
);
4887 wait_event_interruptible_timeout
4889 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4890 || kthread_should_stop(),
4893 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4895 thread
->run(thread
->mddev
);
4901 void md_wakeup_thread(mdk_thread_t
*thread
)
4904 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4905 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4906 wake_up(&thread
->wqueue
);
4910 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4913 mdk_thread_t
*thread
;
4915 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4919 init_waitqueue_head(&thread
->wqueue
);
4922 thread
->mddev
= mddev
;
4923 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4924 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4925 if (IS_ERR(thread
->tsk
)) {
4932 void md_unregister_thread(mdk_thread_t
*thread
)
4934 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
4936 kthread_stop(thread
->tsk
);
4940 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4947 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4950 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4952 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4953 __builtin_return_address(0),__builtin_return_address(1),
4954 __builtin_return_address(2),__builtin_return_address(3));
4958 if (!mddev
->pers
->error_handler
)
4960 mddev
->pers
->error_handler(mddev
,rdev
);
4961 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4962 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4963 md_wakeup_thread(mddev
->thread
);
4964 md_new_event_inintr(mddev
);
4967 /* seq_file implementation /proc/mdstat */
4969 static void status_unused(struct seq_file
*seq
)
4973 struct list_head
*tmp
;
4975 seq_printf(seq
, "unused devices: ");
4977 rdev_for_each_list(rdev
, tmp
, pending_raid_disks
) {
4978 char b
[BDEVNAME_SIZE
];
4980 seq_printf(seq
, "%s ",
4981 bdevname(rdev
->bdev
,b
));
4984 seq_printf(seq
, "<none>");
4986 seq_printf(seq
, "\n");
4990 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4992 sector_t max_blocks
, resync
, res
;
4993 unsigned long dt
, db
, rt
;
4995 unsigned int per_milli
;
4997 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4999 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5000 max_blocks
= mddev
->resync_max_sectors
>> 1;
5002 max_blocks
= mddev
->size
;
5005 * Should not happen.
5011 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5012 * in a sector_t, and (max_blocks>>scale) will fit in a
5013 * u32, as those are the requirements for sector_div.
5014 * Thus 'scale' must be at least 10
5017 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5018 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5021 res
= (resync
>>scale
)*1000;
5022 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5026 int i
, x
= per_milli
/50, y
= 20-x
;
5027 seq_printf(seq
, "[");
5028 for (i
= 0; i
< x
; i
++)
5029 seq_printf(seq
, "=");
5030 seq_printf(seq
, ">");
5031 for (i
= 0; i
< y
; i
++)
5032 seq_printf(seq
, ".");
5033 seq_printf(seq
, "] ");
5035 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5036 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5038 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5040 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5041 "resync" : "recovery"))),
5042 per_milli
/10, per_milli
% 10,
5043 (unsigned long long) resync
,
5044 (unsigned long long) max_blocks
);
5047 * We do not want to overflow, so the order of operands and
5048 * the * 100 / 100 trick are important. We do a +1 to be
5049 * safe against division by zero. We only estimate anyway.
5051 * dt: time from mark until now
5052 * db: blocks written from mark until now
5053 * rt: remaining time
5055 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5057 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5058 - mddev
->resync_mark_cnt
;
5059 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5061 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5063 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5066 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5068 struct list_head
*tmp
;
5078 spin_lock(&all_mddevs_lock
);
5079 list_for_each(tmp
,&all_mddevs
)
5081 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5083 spin_unlock(&all_mddevs_lock
);
5086 spin_unlock(&all_mddevs_lock
);
5088 return (void*)2;/* tail */
5092 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5094 struct list_head
*tmp
;
5095 mddev_t
*next_mddev
, *mddev
= v
;
5101 spin_lock(&all_mddevs_lock
);
5103 tmp
= all_mddevs
.next
;
5105 tmp
= mddev
->all_mddevs
.next
;
5106 if (tmp
!= &all_mddevs
)
5107 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5109 next_mddev
= (void*)2;
5112 spin_unlock(&all_mddevs_lock
);
5120 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5124 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5128 struct mdstat_info
{
5132 static int md_seq_show(struct seq_file
*seq
, void *v
)
5136 struct list_head
*tmp2
;
5138 struct mdstat_info
*mi
= seq
->private;
5139 struct bitmap
*bitmap
;
5141 if (v
== (void*)1) {
5142 struct mdk_personality
*pers
;
5143 seq_printf(seq
, "Personalities : ");
5144 spin_lock(&pers_lock
);
5145 list_for_each_entry(pers
, &pers_list
, list
)
5146 seq_printf(seq
, "[%s] ", pers
->name
);
5148 spin_unlock(&pers_lock
);
5149 seq_printf(seq
, "\n");
5150 mi
->event
= atomic_read(&md_event_count
);
5153 if (v
== (void*)2) {
5158 if (mddev_lock(mddev
) < 0)
5161 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5162 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5163 mddev
->pers
? "" : "in");
5166 seq_printf(seq
, " (read-only)");
5168 seq_printf(seq
, " (auto-read-only)");
5169 seq_printf(seq
, " %s", mddev
->pers
->name
);
5173 rdev_for_each(rdev
, tmp2
, mddev
) {
5174 char b
[BDEVNAME_SIZE
];
5175 seq_printf(seq
, " %s[%d]",
5176 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5177 if (test_bit(WriteMostly
, &rdev
->flags
))
5178 seq_printf(seq
, "(W)");
5179 if (test_bit(Faulty
, &rdev
->flags
)) {
5180 seq_printf(seq
, "(F)");
5182 } else if (rdev
->raid_disk
< 0)
5183 seq_printf(seq
, "(S)"); /* spare */
5187 if (!list_empty(&mddev
->disks
)) {
5189 seq_printf(seq
, "\n %llu blocks",
5190 (unsigned long long)mddev
->array_size
);
5192 seq_printf(seq
, "\n %llu blocks",
5193 (unsigned long long)size
);
5195 if (mddev
->persistent
) {
5196 if (mddev
->major_version
!= 0 ||
5197 mddev
->minor_version
!= 90) {
5198 seq_printf(seq
," super %d.%d",
5199 mddev
->major_version
,
5200 mddev
->minor_version
);
5202 } else if (mddev
->external
)
5203 seq_printf(seq
, " super external:%s",
5204 mddev
->metadata_type
);
5206 seq_printf(seq
, " super non-persistent");
5209 mddev
->pers
->status (seq
, mddev
);
5210 seq_printf(seq
, "\n ");
5211 if (mddev
->pers
->sync_request
) {
5212 if (mddev
->curr_resync
> 2) {
5213 status_resync (seq
, mddev
);
5214 seq_printf(seq
, "\n ");
5215 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5216 seq_printf(seq
, "\tresync=DELAYED\n ");
5217 else if (mddev
->recovery_cp
< MaxSector
)
5218 seq_printf(seq
, "\tresync=PENDING\n ");
5221 seq_printf(seq
, "\n ");
5223 if ((bitmap
= mddev
->bitmap
)) {
5224 unsigned long chunk_kb
;
5225 unsigned long flags
;
5226 spin_lock_irqsave(&bitmap
->lock
, flags
);
5227 chunk_kb
= bitmap
->chunksize
>> 10;
5228 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5230 bitmap
->pages
- bitmap
->missing_pages
,
5232 (bitmap
->pages
- bitmap
->missing_pages
)
5233 << (PAGE_SHIFT
- 10),
5234 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5235 chunk_kb
? "KB" : "B");
5237 seq_printf(seq
, ", file: ");
5238 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5241 seq_printf(seq
, "\n");
5242 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5245 seq_printf(seq
, "\n");
5247 mddev_unlock(mddev
);
5252 static struct seq_operations md_seq_ops
= {
5253 .start
= md_seq_start
,
5254 .next
= md_seq_next
,
5255 .stop
= md_seq_stop
,
5256 .show
= md_seq_show
,
5259 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5262 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5266 error
= seq_open(file
, &md_seq_ops
);
5270 struct seq_file
*p
= file
->private_data
;
5272 mi
->event
= atomic_read(&md_event_count
);
5277 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5279 struct seq_file
*m
= filp
->private_data
;
5280 struct mdstat_info
*mi
= m
->private;
5283 poll_wait(filp
, &md_event_waiters
, wait
);
5285 /* always allow read */
5286 mask
= POLLIN
| POLLRDNORM
;
5288 if (mi
->event
!= atomic_read(&md_event_count
))
5289 mask
|= POLLERR
| POLLPRI
;
5293 static const struct file_operations md_seq_fops
= {
5294 .owner
= THIS_MODULE
,
5295 .open
= md_seq_open
,
5297 .llseek
= seq_lseek
,
5298 .release
= seq_release_private
,
5299 .poll
= mdstat_poll
,
5302 int register_md_personality(struct mdk_personality
*p
)
5304 spin_lock(&pers_lock
);
5305 list_add_tail(&p
->list
, &pers_list
);
5306 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5307 spin_unlock(&pers_lock
);
5311 int unregister_md_personality(struct mdk_personality
*p
)
5313 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5314 spin_lock(&pers_lock
);
5315 list_del_init(&p
->list
);
5316 spin_unlock(&pers_lock
);
5320 static int is_mddev_idle(mddev_t
*mddev
)
5323 struct list_head
*tmp
;
5328 rdev_for_each(rdev
, tmp
, mddev
) {
5329 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5330 curr_events
= disk_stat_read(disk
, sectors
[0]) +
5331 disk_stat_read(disk
, sectors
[1]) -
5332 atomic_read(&disk
->sync_io
);
5333 /* sync IO will cause sync_io to increase before the disk_stats
5334 * as sync_io is counted when a request starts, and
5335 * disk_stats is counted when it completes.
5336 * So resync activity will cause curr_events to be smaller than
5337 * when there was no such activity.
5338 * non-sync IO will cause disk_stat to increase without
5339 * increasing sync_io so curr_events will (eventually)
5340 * be larger than it was before. Once it becomes
5341 * substantially larger, the test below will cause
5342 * the array to appear non-idle, and resync will slow
5344 * If there is a lot of outstanding resync activity when
5345 * we set last_event to curr_events, then all that activity
5346 * completing might cause the array to appear non-idle
5347 * and resync will be slowed down even though there might
5348 * not have been non-resync activity. This will only
5349 * happen once though. 'last_events' will soon reflect
5350 * the state where there is little or no outstanding
5351 * resync requests, and further resync activity will
5352 * always make curr_events less than last_events.
5355 if (curr_events
- rdev
->last_events
> 4096) {
5356 rdev
->last_events
= curr_events
;
5363 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5365 /* another "blocks" (512byte) blocks have been synced */
5366 atomic_sub(blocks
, &mddev
->recovery_active
);
5367 wake_up(&mddev
->recovery_wait
);
5369 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5370 md_wakeup_thread(mddev
->thread
);
5371 // stop recovery, signal do_sync ....
5376 /* md_write_start(mddev, bi)
5377 * If we need to update some array metadata (e.g. 'active' flag
5378 * in superblock) before writing, schedule a superblock update
5379 * and wait for it to complete.
5381 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5383 if (bio_data_dir(bi
) != WRITE
)
5386 BUG_ON(mddev
->ro
== 1);
5387 if (mddev
->ro
== 2) {
5388 /* need to switch to read/write */
5390 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5391 md_wakeup_thread(mddev
->thread
);
5392 md_wakeup_thread(mddev
->sync_thread
);
5394 atomic_inc(&mddev
->writes_pending
);
5395 if (mddev
->in_sync
) {
5396 spin_lock_irq(&mddev
->write_lock
);
5397 if (mddev
->in_sync
) {
5399 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5400 md_wakeup_thread(mddev
->thread
);
5402 spin_unlock_irq(&mddev
->write_lock
);
5404 wait_event(mddev
->sb_wait
, mddev
->flags
==0);
5407 void md_write_end(mddev_t
*mddev
)
5409 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5410 if (mddev
->safemode
== 2)
5411 md_wakeup_thread(mddev
->thread
);
5412 else if (mddev
->safemode_delay
)
5413 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5417 /* md_allow_write(mddev)
5418 * Calling this ensures that the array is marked 'active' so that writes
5419 * may proceed without blocking. It is important to call this before
5420 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5421 * Must be called with mddev_lock held.
5423 void md_allow_write(mddev_t
*mddev
)
5430 spin_lock_irq(&mddev
->write_lock
);
5431 if (mddev
->in_sync
) {
5433 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5434 if (mddev
->safemode_delay
&&
5435 mddev
->safemode
== 0)
5436 mddev
->safemode
= 1;
5437 spin_unlock_irq(&mddev
->write_lock
);
5438 md_update_sb(mddev
, 0);
5440 spin_unlock_irq(&mddev
->write_lock
);
5442 EXPORT_SYMBOL_GPL(md_allow_write
);
5444 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
5446 #define SYNC_MARKS 10
5447 #define SYNC_MARK_STEP (3*HZ)
5448 void md_do_sync(mddev_t
*mddev
)
5451 unsigned int currspeed
= 0,
5453 sector_t max_sectors
,j
, io_sectors
;
5454 unsigned long mark
[SYNC_MARKS
];
5455 sector_t mark_cnt
[SYNC_MARKS
];
5457 struct list_head
*tmp
;
5458 sector_t last_check
;
5460 struct list_head
*rtmp
;
5464 /* just incase thread restarts... */
5465 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5467 if (mddev
->ro
) /* never try to sync a read-only array */
5470 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5471 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5472 desc
= "data-check";
5473 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5474 desc
= "requested-resync";
5477 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5482 /* we overload curr_resync somewhat here.
5483 * 0 == not engaged in resync at all
5484 * 2 == checking that there is no conflict with another sync
5485 * 1 == like 2, but have yielded to allow conflicting resync to
5487 * other == active in resync - this many blocks
5489 * Before starting a resync we must have set curr_resync to
5490 * 2, and then checked that every "conflicting" array has curr_resync
5491 * less than ours. When we find one that is the same or higher
5492 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5493 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5494 * This will mean we have to start checking from the beginning again.
5499 mddev
->curr_resync
= 2;
5502 if (kthread_should_stop()) {
5503 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5506 for_each_mddev(mddev2
, tmp
) {
5507 if (mddev2
== mddev
)
5509 if (mddev2
->curr_resync
&&
5510 match_mddev_units(mddev
,mddev2
)) {
5512 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5513 /* arbitrarily yield */
5514 mddev
->curr_resync
= 1;
5515 wake_up(&resync_wait
);
5517 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5518 /* no need to wait here, we can wait the next
5519 * time 'round when curr_resync == 2
5522 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5523 if (!kthread_should_stop() &&
5524 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5525 printk(KERN_INFO
"md: delaying %s of %s"
5526 " until %s has finished (they"
5527 " share one or more physical units)\n",
5528 desc
, mdname(mddev
), mdname(mddev2
));
5531 finish_wait(&resync_wait
, &wq
);
5534 finish_wait(&resync_wait
, &wq
);
5537 } while (mddev
->curr_resync
< 2);
5540 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5541 /* resync follows the size requested by the personality,
5542 * which defaults to physical size, but can be virtual size
5544 max_sectors
= mddev
->resync_max_sectors
;
5545 mddev
->resync_mismatches
= 0;
5546 /* we don't use the checkpoint if there's a bitmap */
5547 if (!mddev
->bitmap
&&
5548 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5549 j
= mddev
->recovery_cp
;
5550 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5551 max_sectors
= mddev
->size
<< 1;
5553 /* recovery follows the physical size of devices */
5554 max_sectors
= mddev
->size
<< 1;
5556 rdev_for_each(rdev
, rtmp
, mddev
)
5557 if (rdev
->raid_disk
>= 0 &&
5558 !test_bit(Faulty
, &rdev
->flags
) &&
5559 !test_bit(In_sync
, &rdev
->flags
) &&
5560 rdev
->recovery_offset
< j
)
5561 j
= rdev
->recovery_offset
;
5564 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5565 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5566 " %d KB/sec/disk.\n", speed_min(mddev
));
5567 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5568 "(but not more than %d KB/sec) for %s.\n",
5569 speed_max(mddev
), desc
);
5571 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5574 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5576 mark_cnt
[m
] = io_sectors
;
5579 mddev
->resync_mark
= mark
[last_mark
];
5580 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5583 * Tune reconstruction:
5585 window
= 32*(PAGE_SIZE
/512);
5586 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5587 window
/2,(unsigned long long) max_sectors
/2);
5589 atomic_set(&mddev
->recovery_active
, 0);
5590 init_waitqueue_head(&mddev
->recovery_wait
);
5595 "md: resuming %s of %s from checkpoint.\n",
5596 desc
, mdname(mddev
));
5597 mddev
->curr_resync
= j
;
5600 while (j
< max_sectors
) {
5604 if (j
>= mddev
->resync_max
) {
5605 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5606 wait_event(mddev
->recovery_wait
,
5607 mddev
->resync_max
> j
5608 || kthread_should_stop());
5610 if (kthread_should_stop())
5612 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5613 currspeed
< speed_min(mddev
));
5615 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5619 if (!skipped
) { /* actual IO requested */
5620 io_sectors
+= sectors
;
5621 atomic_add(sectors
, &mddev
->recovery_active
);
5625 if (j
>1) mddev
->curr_resync
= j
;
5626 mddev
->curr_mark_cnt
= io_sectors
;
5627 if (last_check
== 0)
5628 /* this is the earliers that rebuilt will be
5629 * visible in /proc/mdstat
5631 md_new_event(mddev
);
5633 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5636 last_check
= io_sectors
;
5638 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
5639 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
5643 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5645 int next
= (last_mark
+1) % SYNC_MARKS
;
5647 mddev
->resync_mark
= mark
[next
];
5648 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5649 mark
[next
] = jiffies
;
5650 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5655 if (kthread_should_stop())
5660 * this loop exits only if either when we are slower than
5661 * the 'hard' speed limit, or the system was IO-idle for
5663 * the system might be non-idle CPU-wise, but we only care
5664 * about not overloading the IO subsystem. (things like an
5665 * e2fsck being done on the RAID array should execute fast)
5667 blk_unplug(mddev
->queue
);
5670 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5671 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5673 if (currspeed
> speed_min(mddev
)) {
5674 if ((currspeed
> speed_max(mddev
)) ||
5675 !is_mddev_idle(mddev
)) {
5681 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5683 * this also signals 'finished resyncing' to md_stop
5686 blk_unplug(mddev
->queue
);
5688 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5690 /* tell personality that we are finished */
5691 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5693 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5694 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5695 mddev
->curr_resync
> 2) {
5696 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5697 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5698 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5700 "md: checkpointing %s of %s.\n",
5701 desc
, mdname(mddev
));
5702 mddev
->recovery_cp
= mddev
->curr_resync
;
5705 mddev
->recovery_cp
= MaxSector
;
5707 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5708 mddev
->curr_resync
= MaxSector
;
5709 rdev_for_each(rdev
, rtmp
, mddev
)
5710 if (rdev
->raid_disk
>= 0 &&
5711 !test_bit(Faulty
, &rdev
->flags
) &&
5712 !test_bit(In_sync
, &rdev
->flags
) &&
5713 rdev
->recovery_offset
< mddev
->curr_resync
)
5714 rdev
->recovery_offset
= mddev
->curr_resync
;
5717 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5720 mddev
->curr_resync
= 0;
5721 mddev
->resync_max
= MaxSector
;
5722 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5723 wake_up(&resync_wait
);
5724 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5725 md_wakeup_thread(mddev
->thread
);
5730 * got a signal, exit.
5733 "md: md_do_sync() got signal ... exiting\n");
5734 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5738 EXPORT_SYMBOL_GPL(md_do_sync
);
5741 static int remove_and_add_spares(mddev_t
*mddev
)
5744 struct list_head
*rtmp
;
5747 rdev_for_each(rdev
, rtmp
, mddev
)
5748 if (rdev
->raid_disk
>= 0 &&
5750 (test_bit(Faulty
, &rdev
->flags
) ||
5751 ! test_bit(In_sync
, &rdev
->flags
)) &&
5752 atomic_read(&rdev
->nr_pending
)==0) {
5753 if (mddev
->pers
->hot_remove_disk(
5754 mddev
, rdev
->raid_disk
)==0) {
5756 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5757 sysfs_remove_link(&mddev
->kobj
, nm
);
5758 rdev
->raid_disk
= -1;
5762 if (mddev
->degraded
) {
5763 rdev_for_each(rdev
, rtmp
, mddev
)
5764 if (rdev
->raid_disk
< 0
5765 && !test_bit(Faulty
, &rdev
->flags
)) {
5766 rdev
->recovery_offset
= 0;
5767 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
5769 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5770 if (sysfs_create_link(&mddev
->kobj
,
5773 "md: cannot register "
5777 md_new_event(mddev
);
5785 * This routine is regularly called by all per-raid-array threads to
5786 * deal with generic issues like resync and super-block update.
5787 * Raid personalities that don't have a thread (linear/raid0) do not
5788 * need this as they never do any recovery or update the superblock.
5790 * It does not do any resync itself, but rather "forks" off other threads
5791 * to do that as needed.
5792 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5793 * "->recovery" and create a thread at ->sync_thread.
5794 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5795 * and wakeups up this thread which will reap the thread and finish up.
5796 * This thread also removes any faulty devices (with nr_pending == 0).
5798 * The overall approach is:
5799 * 1/ if the superblock needs updating, update it.
5800 * 2/ If a recovery thread is running, don't do anything else.
5801 * 3/ If recovery has finished, clean up, possibly marking spares active.
5802 * 4/ If there are any faulty devices, remove them.
5803 * 5/ If array is degraded, try to add spares devices
5804 * 6/ If array has spares or is not in-sync, start a resync thread.
5806 void md_check_recovery(mddev_t
*mddev
)
5809 struct list_head
*rtmp
;
5813 bitmap_daemon_work(mddev
->bitmap
);
5818 if (signal_pending(current
)) {
5819 if (mddev
->pers
->sync_request
) {
5820 printk(KERN_INFO
"md: %s in immediate safe mode\n",
5822 mddev
->safemode
= 2;
5824 flush_signals(current
);
5828 (mddev
->flags
&& !mddev
->external
) ||
5829 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
5830 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
5831 (mddev
->safemode
== 1) ||
5832 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
5833 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
5837 if (mddev_trylock(mddev
)) {
5840 spin_lock_irq(&mddev
->write_lock
);
5841 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
5842 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
5844 if (mddev
->persistent
)
5845 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5847 if (mddev
->safemode
== 1)
5848 mddev
->safemode
= 0;
5849 spin_unlock_irq(&mddev
->write_lock
);
5852 md_update_sb(mddev
, 0);
5855 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
5856 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
5857 /* resync/recovery still happening */
5858 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5861 if (mddev
->sync_thread
) {
5862 /* resync has finished, collect result */
5863 md_unregister_thread(mddev
->sync_thread
);
5864 mddev
->sync_thread
= NULL
;
5865 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5866 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5868 /* activate any spares */
5869 mddev
->pers
->spare_active(mddev
);
5871 md_update_sb(mddev
, 1);
5873 /* if array is no-longer degraded, then any saved_raid_disk
5874 * information must be scrapped
5876 if (!mddev
->degraded
)
5877 rdev_for_each(rdev
, rtmp
, mddev
)
5878 rdev
->saved_raid_disk
= -1;
5880 mddev
->recovery
= 0;
5881 /* flag recovery needed just to double check */
5882 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5883 md_new_event(mddev
);
5886 /* Clear some bits that don't mean anything, but
5889 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5890 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5891 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5892 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5894 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
5896 /* no recovery is running.
5897 * remove any failed drives, then
5898 * add spares if possible.
5899 * Spare are also removed and re-added, to allow
5900 * the personality to fail the re-add.
5903 if (mddev
->reshape_position
!= MaxSector
) {
5904 if (mddev
->pers
->check_reshape(mddev
) != 0)
5905 /* Cannot proceed */
5907 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
5908 } else if ((spares
= remove_and_add_spares(mddev
))) {
5909 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5910 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
5911 } else if (mddev
->recovery_cp
< MaxSector
) {
5912 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5913 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5914 /* nothing to be done ... */
5917 if (mddev
->pers
->sync_request
) {
5918 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
5919 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
5920 /* We are adding a device or devices to an array
5921 * which has the bitmap stored on all devices.
5922 * So make sure all bitmap pages get written
5924 bitmap_write_all(mddev
->bitmap
);
5926 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5929 if (!mddev
->sync_thread
) {
5930 printk(KERN_ERR
"%s: could not start resync"
5933 /* leave the spares where they are, it shouldn't hurt */
5934 mddev
->recovery
= 0;
5936 md_wakeup_thread(mddev
->sync_thread
);
5937 md_new_event(mddev
);
5940 mddev_unlock(mddev
);
5944 static int md_notify_reboot(struct notifier_block
*this,
5945 unsigned long code
, void *x
)
5947 struct list_head
*tmp
;
5950 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5952 printk(KERN_INFO
"md: stopping all md devices.\n");
5954 for_each_mddev(mddev
, tmp
)
5955 if (mddev_trylock(mddev
)) {
5956 do_md_stop (mddev
, 1);
5957 mddev_unlock(mddev
);
5960 * certain more exotic SCSI devices are known to be
5961 * volatile wrt too early system reboots. While the
5962 * right place to handle this issue is the given
5963 * driver, we do want to have a safe RAID driver ...
5970 static struct notifier_block md_notifier
= {
5971 .notifier_call
= md_notify_reboot
,
5973 .priority
= INT_MAX
, /* before any real devices */
5976 static void md_geninit(void)
5978 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5980 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
5983 static int __init
md_init(void)
5985 if (register_blkdev(MAJOR_NR
, "md"))
5987 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5988 unregister_blkdev(MAJOR_NR
, "md");
5991 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5992 md_probe
, NULL
, NULL
);
5993 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
5994 md_probe
, NULL
, NULL
);
5996 register_reboot_notifier(&md_notifier
);
5997 raid_table_header
= register_sysctl_table(raid_root_table
);
6007 * Searches all registered partitions for autorun RAID arrays
6011 static LIST_HEAD(all_detected_devices
);
6012 struct detected_devices_node
{
6013 struct list_head list
;
6017 void md_autodetect_dev(dev_t dev
)
6019 struct detected_devices_node
*node_detected_dev
;
6021 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6022 if (node_detected_dev
) {
6023 node_detected_dev
->dev
= dev
;
6024 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6026 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6027 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6032 static void autostart_arrays(int part
)
6035 struct detected_devices_node
*node_detected_dev
;
6037 int i_scanned
, i_passed
;
6042 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6044 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6046 node_detected_dev
= list_entry(all_detected_devices
.next
,
6047 struct detected_devices_node
, list
);
6048 list_del(&node_detected_dev
->list
);
6049 dev
= node_detected_dev
->dev
;
6050 kfree(node_detected_dev
);
6051 rdev
= md_import_device(dev
,0, 90);
6055 if (test_bit(Faulty
, &rdev
->flags
)) {
6059 set_bit(AutoDetected
, &rdev
->flags
);
6060 list_add(&rdev
->same_set
, &pending_raid_disks
);
6064 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6065 i_scanned
, i_passed
);
6067 autorun_devices(part
);
6070 #endif /* !MODULE */
6072 static __exit
void md_exit(void)
6075 struct list_head
*tmp
;
6077 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6078 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6080 unregister_blkdev(MAJOR_NR
,"md");
6081 unregister_blkdev(mdp_major
, "mdp");
6082 unregister_reboot_notifier(&md_notifier
);
6083 unregister_sysctl_table(raid_table_header
);
6084 remove_proc_entry("mdstat", NULL
);
6085 for_each_mddev(mddev
, tmp
) {
6086 struct gendisk
*disk
= mddev
->gendisk
;
6089 export_array(mddev
);
6092 mddev
->gendisk
= NULL
;
6097 subsys_initcall(md_init
);
6098 module_exit(md_exit
)
6100 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6102 return sprintf(buffer
, "%d", start_readonly
);
6104 static int set_ro(const char *val
, struct kernel_param
*kp
)
6107 int num
= simple_strtoul(val
, &e
, 10);
6108 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6109 start_readonly
= num
;
6115 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6116 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6119 EXPORT_SYMBOL(register_md_personality
);
6120 EXPORT_SYMBOL(unregister_md_personality
);
6121 EXPORT_SYMBOL(md_error
);
6122 EXPORT_SYMBOL(md_done_sync
);
6123 EXPORT_SYMBOL(md_write_start
);
6124 EXPORT_SYMBOL(md_write_end
);
6125 EXPORT_SYMBOL(md_register_thread
);
6126 EXPORT_SYMBOL(md_unregister_thread
);
6127 EXPORT_SYMBOL(md_wakeup_thread
);
6128 EXPORT_SYMBOL(md_check_recovery
);
6129 MODULE_LICENSE("GPL");
6131 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);