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/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
48 #include <linux/raid/md_p.h>
49 #include <linux/raid/md_u.h>
54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
58 static void autostart_arrays(int part
);
61 static LIST_HEAD(pers_list
);
62 static DEFINE_SPINLOCK(pers_lock
);
64 static void md_print_devices(void);
66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
71 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
72 * is 1000 KB/sec, so the extra system load does not show up that much.
73 * Increase it if you want to have more _guaranteed_ speed. Note that
74 * the RAID driver will use the maximum available bandwidth if the IO
75 * subsystem is idle. There is also an 'absolute maximum' reconstruction
76 * speed limit - in case reconstruction slows down your system despite
79 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
80 * or /sys/block/mdX/md/sync_speed_{min,max}
83 static int sysctl_speed_limit_min
= 1000;
84 static int sysctl_speed_limit_max
= 200000;
85 static inline int speed_min(mddev_t
*mddev
)
87 return mddev
->sync_speed_min
?
88 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
91 static inline int speed_max(mddev_t
*mddev
)
93 return mddev
->sync_speed_max
?
94 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
97 static struct ctl_table_header
*raid_table_header
;
99 static ctl_table raid_table
[] = {
101 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
102 .procname
= "speed_limit_min",
103 .data
= &sysctl_speed_limit_min
,
104 .maxlen
= sizeof(int),
105 .mode
= S_IRUGO
|S_IWUSR
,
106 .proc_handler
= &proc_dointvec
,
109 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
110 .procname
= "speed_limit_max",
111 .data
= &sysctl_speed_limit_max
,
112 .maxlen
= sizeof(int),
113 .mode
= S_IRUGO
|S_IWUSR
,
114 .proc_handler
= &proc_dointvec
,
119 static ctl_table raid_dir_table
[] = {
121 .ctl_name
= DEV_RAID
,
124 .mode
= S_IRUGO
|S_IXUGO
,
130 static ctl_table raid_root_table
[] = {
136 .child
= raid_dir_table
,
141 static struct block_device_operations md_fops
;
143 static int start_readonly
;
146 * We have a system wide 'event count' that is incremented
147 * on any 'interesting' event, and readers of /proc/mdstat
148 * can use 'poll' or 'select' to find out when the event
152 * start array, stop array, error, add device, remove device,
153 * start build, activate spare
155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
156 static atomic_t md_event_count
;
157 void md_new_event(mddev_t
*mddev
)
159 atomic_inc(&md_event_count
);
160 wake_up(&md_event_waiters
);
162 EXPORT_SYMBOL_GPL(md_new_event
);
164 /* Alternate version that can be called from interrupts
165 * when calling sysfs_notify isn't needed.
167 static void md_new_event_inintr(mddev_t
*mddev
)
169 atomic_inc(&md_event_count
);
170 wake_up(&md_event_waiters
);
174 * Enables to iterate over all existing md arrays
175 * all_mddevs_lock protects this list.
177 static LIST_HEAD(all_mddevs
);
178 static DEFINE_SPINLOCK(all_mddevs_lock
);
182 * iterates through all used mddevs in the system.
183 * We take care to grab the all_mddevs_lock whenever navigating
184 * the list, and to always hold a refcount when unlocked.
185 * Any code which breaks out of this loop while own
186 * a reference to the current mddev and must mddev_put it.
188 #define for_each_mddev(mddev,tmp) \
190 for (({ spin_lock(&all_mddevs_lock); \
191 tmp = all_mddevs.next; \
193 ({ if (tmp != &all_mddevs) \
194 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
195 spin_unlock(&all_mddevs_lock); \
196 if (mddev) mddev_put(mddev); \
197 mddev = list_entry(tmp, mddev_t, all_mddevs); \
198 tmp != &all_mddevs;}); \
199 ({ spin_lock(&all_mddevs_lock); \
204 static int md_fail_request(struct request_queue
*q
, struct bio
*bio
)
210 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
212 atomic_inc(&mddev
->active
);
216 static void mddev_delayed_delete(struct work_struct
*ws
)
218 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
219 kobject_del(&mddev
->kobj
);
220 kobject_put(&mddev
->kobj
);
223 static void mddev_put(mddev_t
*mddev
)
225 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
227 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
228 !mddev
->hold_active
) {
229 list_del(&mddev
->all_mddevs
);
230 if (mddev
->gendisk
) {
231 /* we did a probe so need to clean up.
232 * Call schedule_work inside the spinlock
233 * so that flush_scheduled_work() after
234 * mddev_find will succeed in waiting for the
237 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
238 schedule_work(&mddev
->del_work
);
242 spin_unlock(&all_mddevs_lock
);
245 static mddev_t
* mddev_find(dev_t unit
)
247 mddev_t
*mddev
, *new = NULL
;
250 spin_lock(&all_mddevs_lock
);
253 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
254 if (mddev
->unit
== unit
) {
256 spin_unlock(&all_mddevs_lock
);
262 list_add(&new->all_mddevs
, &all_mddevs
);
263 spin_unlock(&all_mddevs_lock
);
264 new->hold_active
= UNTIL_IOCTL
;
268 /* find an unused unit number */
269 static int next_minor
= 512;
270 int start
= next_minor
;
274 dev
= MKDEV(MD_MAJOR
, next_minor
);
276 if (next_minor
> MINORMASK
)
278 if (next_minor
== start
) {
279 /* Oh dear, all in use. */
280 spin_unlock(&all_mddevs_lock
);
286 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
287 if (mddev
->unit
== dev
) {
293 new->md_minor
= MINOR(dev
);
294 new->hold_active
= UNTIL_STOP
;
295 list_add(&new->all_mddevs
, &all_mddevs
);
296 spin_unlock(&all_mddevs_lock
);
299 spin_unlock(&all_mddevs_lock
);
301 new = kzalloc(sizeof(*new), GFP_KERNEL
);
306 if (MAJOR(unit
) == MD_MAJOR
)
307 new->md_minor
= MINOR(unit
);
309 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
311 mutex_init(&new->reconfig_mutex
);
312 INIT_LIST_HEAD(&new->disks
);
313 INIT_LIST_HEAD(&new->all_mddevs
);
314 init_timer(&new->safemode_timer
);
315 atomic_set(&new->active
, 1);
316 atomic_set(&new->openers
, 0);
317 spin_lock_init(&new->write_lock
);
318 init_waitqueue_head(&new->sb_wait
);
319 init_waitqueue_head(&new->recovery_wait
);
320 new->reshape_position
= MaxSector
;
322 new->resync_max
= MaxSector
;
323 new->level
= LEVEL_NONE
;
328 static inline int mddev_lock(mddev_t
* mddev
)
330 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
333 static inline int mddev_trylock(mddev_t
* mddev
)
335 return mutex_trylock(&mddev
->reconfig_mutex
);
338 static inline void mddev_unlock(mddev_t
* mddev
)
340 mutex_unlock(&mddev
->reconfig_mutex
);
342 md_wakeup_thread(mddev
->thread
);
345 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
349 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
350 if (rdev
->desc_nr
== nr
)
356 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
360 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
361 if (rdev
->bdev
->bd_dev
== dev
)
367 static struct mdk_personality
*find_pers(int level
, char *clevel
)
369 struct mdk_personality
*pers
;
370 list_for_each_entry(pers
, &pers_list
, list
) {
371 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
373 if (strcmp(pers
->name
, clevel
)==0)
379 /* return the offset of the super block in 512byte sectors */
380 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
382 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
383 return MD_NEW_SIZE_SECTORS(num_sectors
);
386 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
388 sector_t num_sectors
= rdev
->sb_start
;
391 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
395 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
400 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
401 if (!rdev
->sb_page
) {
402 printk(KERN_ALERT
"md: out of memory.\n");
409 static void free_disk_sb(mdk_rdev_t
* rdev
)
412 put_page(rdev
->sb_page
);
414 rdev
->sb_page
= NULL
;
421 static void super_written(struct bio
*bio
, int error
)
423 mdk_rdev_t
*rdev
= bio
->bi_private
;
424 mddev_t
*mddev
= rdev
->mddev
;
426 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
427 printk("md: super_written gets error=%d, uptodate=%d\n",
428 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
429 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
430 md_error(mddev
, rdev
);
433 if (atomic_dec_and_test(&mddev
->pending_writes
))
434 wake_up(&mddev
->sb_wait
);
438 static void super_written_barrier(struct bio
*bio
, int error
)
440 struct bio
*bio2
= bio
->bi_private
;
441 mdk_rdev_t
*rdev
= bio2
->bi_private
;
442 mddev_t
*mddev
= rdev
->mddev
;
444 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
445 error
== -EOPNOTSUPP
) {
447 /* barriers don't appear to be supported :-( */
448 set_bit(BarriersNotsupp
, &rdev
->flags
);
449 mddev
->barriers_work
= 0;
450 spin_lock_irqsave(&mddev
->write_lock
, flags
);
451 bio2
->bi_next
= mddev
->biolist
;
452 mddev
->biolist
= bio2
;
453 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
454 wake_up(&mddev
->sb_wait
);
458 bio
->bi_private
= rdev
;
459 super_written(bio
, error
);
463 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
464 sector_t sector
, int size
, struct page
*page
)
466 /* write first size bytes of page to sector of rdev
467 * Increment mddev->pending_writes before returning
468 * and decrement it on completion, waking up sb_wait
469 * if zero is reached.
470 * If an error occurred, call md_error
472 * As we might need to resubmit the request if BIO_RW_BARRIER
473 * causes ENOTSUPP, we allocate a spare bio...
475 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
476 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNCIO
) | (1<<BIO_RW_UNPLUG
);
478 bio
->bi_bdev
= rdev
->bdev
;
479 bio
->bi_sector
= sector
;
480 bio_add_page(bio
, page
, size
, 0);
481 bio
->bi_private
= rdev
;
482 bio
->bi_end_io
= super_written
;
485 atomic_inc(&mddev
->pending_writes
);
486 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
488 rw
|= (1<<BIO_RW_BARRIER
);
489 rbio
= bio_clone(bio
, GFP_NOIO
);
490 rbio
->bi_private
= bio
;
491 rbio
->bi_end_io
= super_written_barrier
;
492 submit_bio(rw
, rbio
);
497 void md_super_wait(mddev_t
*mddev
)
499 /* wait for all superblock writes that were scheduled to complete.
500 * if any had to be retried (due to BARRIER problems), retry them
504 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
505 if (atomic_read(&mddev
->pending_writes
)==0)
507 while (mddev
->biolist
) {
509 spin_lock_irq(&mddev
->write_lock
);
510 bio
= mddev
->biolist
;
511 mddev
->biolist
= bio
->bi_next
;
513 spin_unlock_irq(&mddev
->write_lock
);
514 submit_bio(bio
->bi_rw
, bio
);
518 finish_wait(&mddev
->sb_wait
, &wq
);
521 static void bi_complete(struct bio
*bio
, int error
)
523 complete((struct completion
*)bio
->bi_private
);
526 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
527 struct page
*page
, int rw
)
529 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
530 struct completion event
;
533 rw
|= (1 << BIO_RW_SYNCIO
) | (1 << BIO_RW_UNPLUG
);
536 bio
->bi_sector
= sector
;
537 bio_add_page(bio
, page
, size
, 0);
538 init_completion(&event
);
539 bio
->bi_private
= &event
;
540 bio
->bi_end_io
= bi_complete
;
542 wait_for_completion(&event
);
544 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
548 EXPORT_SYMBOL_GPL(sync_page_io
);
550 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
552 char b
[BDEVNAME_SIZE
];
553 if (!rdev
->sb_page
) {
561 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
567 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
568 bdevname(rdev
->bdev
,b
));
572 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
574 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
575 sb1
->set_uuid1
== sb2
->set_uuid1
&&
576 sb1
->set_uuid2
== sb2
->set_uuid2
&&
577 sb1
->set_uuid3
== sb2
->set_uuid3
;
580 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
583 mdp_super_t
*tmp1
, *tmp2
;
585 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
586 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
588 if (!tmp1
|| !tmp2
) {
590 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
598 * nr_disks is not constant
603 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
611 static u32
md_csum_fold(u32 csum
)
613 csum
= (csum
& 0xffff) + (csum
>> 16);
614 return (csum
& 0xffff) + (csum
>> 16);
617 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
620 u32
*sb32
= (u32
*)sb
;
622 unsigned int disk_csum
, csum
;
624 disk_csum
= sb
->sb_csum
;
627 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
629 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
633 /* This used to use csum_partial, which was wrong for several
634 * reasons including that different results are returned on
635 * different architectures. It isn't critical that we get exactly
636 * the same return value as before (we always csum_fold before
637 * testing, and that removes any differences). However as we
638 * know that csum_partial always returned a 16bit value on
639 * alphas, do a fold to maximise conformity to previous behaviour.
641 sb
->sb_csum
= md_csum_fold(disk_csum
);
643 sb
->sb_csum
= disk_csum
;
650 * Handle superblock details.
651 * We want to be able to handle multiple superblock formats
652 * so we have a common interface to them all, and an array of
653 * different handlers.
654 * We rely on user-space to write the initial superblock, and support
655 * reading and updating of superblocks.
656 * Interface methods are:
657 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
658 * loads and validates a superblock on dev.
659 * if refdev != NULL, compare superblocks on both devices
661 * 0 - dev has a superblock that is compatible with refdev
662 * 1 - dev has a superblock that is compatible and newer than refdev
663 * so dev should be used as the refdev in future
664 * -EINVAL superblock incompatible or invalid
665 * -othererror e.g. -EIO
667 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
668 * Verify that dev is acceptable into mddev.
669 * The first time, mddev->raid_disks will be 0, and data from
670 * dev should be merged in. Subsequent calls check that dev
671 * is new enough. Return 0 or -EINVAL
673 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
674 * Update the superblock for rdev with data in mddev
675 * This does not write to disc.
681 struct module
*owner
;
682 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
684 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
685 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
686 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
687 sector_t num_sectors
);
691 * load_super for 0.90.0
693 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
695 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
700 * Calculate the position of the superblock (512byte sectors),
701 * it's at the end of the disk.
703 * It also happens to be a multiple of 4Kb.
705 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
707 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
712 bdevname(rdev
->bdev
, b
);
713 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
715 if (sb
->md_magic
!= MD_SB_MAGIC
) {
716 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
721 if (sb
->major_version
!= 0 ||
722 sb
->minor_version
< 90 ||
723 sb
->minor_version
> 91) {
724 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
725 sb
->major_version
, sb
->minor_version
,
730 if (sb
->raid_disks
<= 0)
733 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
734 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
739 rdev
->preferred_minor
= sb
->md_minor
;
740 rdev
->data_offset
= 0;
741 rdev
->sb_size
= MD_SB_BYTES
;
743 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
744 if (sb
->level
!= 1 && sb
->level
!= 4
745 && sb
->level
!= 5 && sb
->level
!= 6
746 && sb
->level
!= 10) {
747 /* FIXME use a better test */
749 "md: bitmaps not supported for this level.\n");
754 if (sb
->level
== LEVEL_MULTIPATH
)
757 rdev
->desc_nr
= sb
->this_disk
.number
;
763 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
764 if (!uuid_equal(refsb
, sb
)) {
765 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
766 b
, bdevname(refdev
->bdev
,b2
));
769 if (!sb_equal(refsb
, sb
)) {
770 printk(KERN_WARNING
"md: %s has same UUID"
771 " but different superblock to %s\n",
772 b
, bdevname(refdev
->bdev
, b2
));
776 ev2
= md_event(refsb
);
782 rdev
->sectors
= calc_num_sectors(rdev
, sb
->chunk_size
);
784 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
785 /* "this cannot possibly happen" ... */
793 * validate_super for 0.90.0
795 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
798 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
799 __u64 ev1
= md_event(sb
);
801 rdev
->raid_disk
= -1;
802 clear_bit(Faulty
, &rdev
->flags
);
803 clear_bit(In_sync
, &rdev
->flags
);
804 clear_bit(WriteMostly
, &rdev
->flags
);
805 clear_bit(BarriersNotsupp
, &rdev
->flags
);
807 if (mddev
->raid_disks
== 0) {
808 mddev
->major_version
= 0;
809 mddev
->minor_version
= sb
->minor_version
;
810 mddev
->patch_version
= sb
->patch_version
;
812 mddev
->chunk_size
= sb
->chunk_size
;
813 mddev
->ctime
= sb
->ctime
;
814 mddev
->utime
= sb
->utime
;
815 mddev
->level
= sb
->level
;
816 mddev
->clevel
[0] = 0;
817 mddev
->layout
= sb
->layout
;
818 mddev
->raid_disks
= sb
->raid_disks
;
819 mddev
->dev_sectors
= sb
->size
* 2;
821 mddev
->bitmap_offset
= 0;
822 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
824 if (mddev
->minor_version
>= 91) {
825 mddev
->reshape_position
= sb
->reshape_position
;
826 mddev
->delta_disks
= sb
->delta_disks
;
827 mddev
->new_level
= sb
->new_level
;
828 mddev
->new_layout
= sb
->new_layout
;
829 mddev
->new_chunk
= sb
->new_chunk
;
831 mddev
->reshape_position
= MaxSector
;
832 mddev
->delta_disks
= 0;
833 mddev
->new_level
= mddev
->level
;
834 mddev
->new_layout
= mddev
->layout
;
835 mddev
->new_chunk
= mddev
->chunk_size
;
838 if (sb
->state
& (1<<MD_SB_CLEAN
))
839 mddev
->recovery_cp
= MaxSector
;
841 if (sb
->events_hi
== sb
->cp_events_hi
&&
842 sb
->events_lo
== sb
->cp_events_lo
) {
843 mddev
->recovery_cp
= sb
->recovery_cp
;
845 mddev
->recovery_cp
= 0;
848 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
849 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
850 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
851 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
853 mddev
->max_disks
= MD_SB_DISKS
;
855 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
856 mddev
->bitmap_file
== NULL
)
857 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
859 } else if (mddev
->pers
== NULL
) {
860 /* Insist on good event counter while assembling */
862 if (ev1
< mddev
->events
)
864 } else if (mddev
->bitmap
) {
865 /* if adding to array with a bitmap, then we can accept an
866 * older device ... but not too old.
868 if (ev1
< mddev
->bitmap
->events_cleared
)
871 if (ev1
< mddev
->events
)
872 /* just a hot-add of a new device, leave raid_disk at -1 */
876 if (mddev
->level
!= LEVEL_MULTIPATH
) {
877 desc
= sb
->disks
+ rdev
->desc_nr
;
879 if (desc
->state
& (1<<MD_DISK_FAULTY
))
880 set_bit(Faulty
, &rdev
->flags
);
881 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
882 desc->raid_disk < mddev->raid_disks */) {
883 set_bit(In_sync
, &rdev
->flags
);
884 rdev
->raid_disk
= desc
->raid_disk
;
886 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
887 set_bit(WriteMostly
, &rdev
->flags
);
888 } else /* MULTIPATH are always insync */
889 set_bit(In_sync
, &rdev
->flags
);
894 * sync_super for 0.90.0
896 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
900 int next_spare
= mddev
->raid_disks
;
903 /* make rdev->sb match mddev data..
906 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
907 * 3/ any empty disks < next_spare become removed
909 * disks[0] gets initialised to REMOVED because
910 * we cannot be sure from other fields if it has
911 * been initialised or not.
914 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
916 rdev
->sb_size
= MD_SB_BYTES
;
918 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
920 memset(sb
, 0, sizeof(*sb
));
922 sb
->md_magic
= MD_SB_MAGIC
;
923 sb
->major_version
= mddev
->major_version
;
924 sb
->patch_version
= mddev
->patch_version
;
925 sb
->gvalid_words
= 0; /* ignored */
926 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
927 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
928 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
929 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
931 sb
->ctime
= mddev
->ctime
;
932 sb
->level
= mddev
->level
;
933 sb
->size
= mddev
->dev_sectors
/ 2;
934 sb
->raid_disks
= mddev
->raid_disks
;
935 sb
->md_minor
= mddev
->md_minor
;
936 sb
->not_persistent
= 0;
937 sb
->utime
= mddev
->utime
;
939 sb
->events_hi
= (mddev
->events
>>32);
940 sb
->events_lo
= (u32
)mddev
->events
;
942 if (mddev
->reshape_position
== MaxSector
)
943 sb
->minor_version
= 90;
945 sb
->minor_version
= 91;
946 sb
->reshape_position
= mddev
->reshape_position
;
947 sb
->new_level
= mddev
->new_level
;
948 sb
->delta_disks
= mddev
->delta_disks
;
949 sb
->new_layout
= mddev
->new_layout
;
950 sb
->new_chunk
= mddev
->new_chunk
;
952 mddev
->minor_version
= sb
->minor_version
;
955 sb
->recovery_cp
= mddev
->recovery_cp
;
956 sb
->cp_events_hi
= (mddev
->events
>>32);
957 sb
->cp_events_lo
= (u32
)mddev
->events
;
958 if (mddev
->recovery_cp
== MaxSector
)
959 sb
->state
= (1<< MD_SB_CLEAN
);
963 sb
->layout
= mddev
->layout
;
964 sb
->chunk_size
= mddev
->chunk_size
;
966 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
967 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
969 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
970 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
973 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
974 && !test_bit(Faulty
, &rdev2
->flags
))
975 desc_nr
= rdev2
->raid_disk
;
977 desc_nr
= next_spare
++;
978 rdev2
->desc_nr
= desc_nr
;
979 d
= &sb
->disks
[rdev2
->desc_nr
];
981 d
->number
= rdev2
->desc_nr
;
982 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
983 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
984 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
985 && !test_bit(Faulty
, &rdev2
->flags
))
986 d
->raid_disk
= rdev2
->raid_disk
;
988 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
989 if (test_bit(Faulty
, &rdev2
->flags
))
990 d
->state
= (1<<MD_DISK_FAULTY
);
991 else if (test_bit(In_sync
, &rdev2
->flags
)) {
992 d
->state
= (1<<MD_DISK_ACTIVE
);
993 d
->state
|= (1<<MD_DISK_SYNC
);
1001 if (test_bit(WriteMostly
, &rdev2
->flags
))
1002 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1004 /* now set the "removed" and "faulty" bits on any missing devices */
1005 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1006 mdp_disk_t
*d
= &sb
->disks
[i
];
1007 if (d
->state
== 0 && d
->number
== 0) {
1010 d
->state
= (1<<MD_DISK_REMOVED
);
1011 d
->state
|= (1<<MD_DISK_FAULTY
);
1015 sb
->nr_disks
= nr_disks
;
1016 sb
->active_disks
= active
;
1017 sb
->working_disks
= working
;
1018 sb
->failed_disks
= failed
;
1019 sb
->spare_disks
= spare
;
1021 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1022 sb
->sb_csum
= calc_sb_csum(sb
);
1026 * rdev_size_change for 0.90.0
1028 static unsigned long long
1029 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1031 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1032 return 0; /* component must fit device */
1033 if (rdev
->mddev
->bitmap_offset
)
1034 return 0; /* can't move bitmap */
1035 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1036 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1037 num_sectors
= rdev
->sb_start
;
1038 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1040 md_super_wait(rdev
->mddev
);
1041 return num_sectors
/ 2; /* kB for sysfs */
1046 * version 1 superblock
1049 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1053 unsigned long long newcsum
;
1054 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1055 __le32
*isuper
= (__le32
*)sb
;
1058 disk_csum
= sb
->sb_csum
;
1061 for (i
=0; size
>=4; size
-= 4 )
1062 newcsum
+= le32_to_cpu(*isuper
++);
1065 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1067 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1068 sb
->sb_csum
= disk_csum
;
1069 return cpu_to_le32(csum
);
1072 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1074 struct mdp_superblock_1
*sb
;
1077 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1081 * Calculate the position of the superblock in 512byte sectors.
1082 * It is always aligned to a 4K boundary and
1083 * depeding on minor_version, it can be:
1084 * 0: At least 8K, but less than 12K, from end of device
1085 * 1: At start of device
1086 * 2: 4K from start of device.
1088 switch(minor_version
) {
1090 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1092 sb_start
&= ~(sector_t
)(4*2-1);
1103 rdev
->sb_start
= sb_start
;
1105 /* superblock is rarely larger than 1K, but it can be larger,
1106 * and it is safe to read 4k, so we do that
1108 ret
= read_disk_sb(rdev
, 4096);
1109 if (ret
) return ret
;
1112 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1114 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1115 sb
->major_version
!= cpu_to_le32(1) ||
1116 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1117 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1118 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1121 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1122 printk("md: invalid superblock checksum on %s\n",
1123 bdevname(rdev
->bdev
,b
));
1126 if (le64_to_cpu(sb
->data_size
) < 10) {
1127 printk("md: data_size too small on %s\n",
1128 bdevname(rdev
->bdev
,b
));
1131 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1132 if (sb
->level
!= cpu_to_le32(1) &&
1133 sb
->level
!= cpu_to_le32(4) &&
1134 sb
->level
!= cpu_to_le32(5) &&
1135 sb
->level
!= cpu_to_le32(6) &&
1136 sb
->level
!= cpu_to_le32(10)) {
1138 "md: bitmaps not supported for this level.\n");
1143 rdev
->preferred_minor
= 0xffff;
1144 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1145 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1147 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1148 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1149 if (rdev
->sb_size
& bmask
)
1150 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1153 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1156 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1159 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1165 struct mdp_superblock_1
*refsb
=
1166 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1168 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1169 sb
->level
!= refsb
->level
||
1170 sb
->layout
!= refsb
->layout
||
1171 sb
->chunksize
!= refsb
->chunksize
) {
1172 printk(KERN_WARNING
"md: %s has strangely different"
1173 " superblock to %s\n",
1174 bdevname(rdev
->bdev
,b
),
1175 bdevname(refdev
->bdev
,b2
));
1178 ev1
= le64_to_cpu(sb
->events
);
1179 ev2
= le64_to_cpu(refsb
->events
);
1187 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1188 le64_to_cpu(sb
->data_offset
);
1190 rdev
->sectors
= rdev
->sb_start
;
1191 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1193 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1194 if (le32_to_cpu(sb
->chunksize
))
1195 rdev
->sectors
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
) - 1);
1197 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1202 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1204 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1205 __u64 ev1
= le64_to_cpu(sb
->events
);
1207 rdev
->raid_disk
= -1;
1208 clear_bit(Faulty
, &rdev
->flags
);
1209 clear_bit(In_sync
, &rdev
->flags
);
1210 clear_bit(WriteMostly
, &rdev
->flags
);
1211 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1213 if (mddev
->raid_disks
== 0) {
1214 mddev
->major_version
= 1;
1215 mddev
->patch_version
= 0;
1216 mddev
->external
= 0;
1217 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1218 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1219 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1220 mddev
->level
= le32_to_cpu(sb
->level
);
1221 mddev
->clevel
[0] = 0;
1222 mddev
->layout
= le32_to_cpu(sb
->layout
);
1223 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1224 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1225 mddev
->events
= ev1
;
1226 mddev
->bitmap_offset
= 0;
1227 mddev
->default_bitmap_offset
= 1024 >> 9;
1229 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1230 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1232 mddev
->max_disks
= (4096-256)/2;
1234 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1235 mddev
->bitmap_file
== NULL
)
1236 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1238 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1239 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1240 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1241 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1242 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1243 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1245 mddev
->reshape_position
= MaxSector
;
1246 mddev
->delta_disks
= 0;
1247 mddev
->new_level
= mddev
->level
;
1248 mddev
->new_layout
= mddev
->layout
;
1249 mddev
->new_chunk
= mddev
->chunk_size
;
1252 } else if (mddev
->pers
== NULL
) {
1253 /* Insist of good event counter while assembling */
1255 if (ev1
< mddev
->events
)
1257 } else if (mddev
->bitmap
) {
1258 /* If adding to array with a bitmap, then we can accept an
1259 * older device, but not too old.
1261 if (ev1
< mddev
->bitmap
->events_cleared
)
1264 if (ev1
< mddev
->events
)
1265 /* just a hot-add of a new device, leave raid_disk at -1 */
1268 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1270 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1272 case 0xffff: /* spare */
1274 case 0xfffe: /* faulty */
1275 set_bit(Faulty
, &rdev
->flags
);
1278 if ((le32_to_cpu(sb
->feature_map
) &
1279 MD_FEATURE_RECOVERY_OFFSET
))
1280 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1282 set_bit(In_sync
, &rdev
->flags
);
1283 rdev
->raid_disk
= role
;
1286 if (sb
->devflags
& WriteMostly1
)
1287 set_bit(WriteMostly
, &rdev
->flags
);
1288 } else /* MULTIPATH are always insync */
1289 set_bit(In_sync
, &rdev
->flags
);
1294 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1296 struct mdp_superblock_1
*sb
;
1299 /* make rdev->sb match mddev and rdev data. */
1301 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1303 sb
->feature_map
= 0;
1305 sb
->recovery_offset
= cpu_to_le64(0);
1306 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1307 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1308 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1310 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1311 sb
->events
= cpu_to_le64(mddev
->events
);
1313 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1315 sb
->resync_offset
= cpu_to_le64(0);
1317 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1319 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1320 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1322 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1323 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1324 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1327 if (rdev
->raid_disk
>= 0 &&
1328 !test_bit(In_sync
, &rdev
->flags
)) {
1329 if (mddev
->curr_resync_completed
> rdev
->recovery_offset
)
1330 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
1331 if (rdev
->recovery_offset
> 0) {
1333 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1334 sb
->recovery_offset
=
1335 cpu_to_le64(rdev
->recovery_offset
);
1339 if (mddev
->reshape_position
!= MaxSector
) {
1340 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1341 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1342 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1343 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1344 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1345 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1349 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1350 if (rdev2
->desc_nr
+1 > max_dev
)
1351 max_dev
= rdev2
->desc_nr
+1;
1353 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1354 sb
->max_dev
= cpu_to_le32(max_dev
);
1355 for (i
=0; i
<max_dev
;i
++)
1356 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1358 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1360 if (test_bit(Faulty
, &rdev2
->flags
))
1361 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1362 else if (test_bit(In_sync
, &rdev2
->flags
))
1363 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1364 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1365 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1367 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1370 sb
->sb_csum
= calc_sb_1_csum(sb
);
1373 static unsigned long long
1374 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1376 struct mdp_superblock_1
*sb
;
1377 sector_t max_sectors
;
1378 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1379 return 0; /* component must fit device */
1380 if (rdev
->sb_start
< rdev
->data_offset
) {
1381 /* minor versions 1 and 2; superblock before data */
1382 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1383 max_sectors
-= rdev
->data_offset
;
1384 if (!num_sectors
|| num_sectors
> max_sectors
)
1385 num_sectors
= max_sectors
;
1386 } else if (rdev
->mddev
->bitmap_offset
) {
1387 /* minor version 0 with bitmap we can't move */
1390 /* minor version 0; superblock after data */
1392 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1393 sb_start
&= ~(sector_t
)(4*2 - 1);
1394 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1395 if (!num_sectors
|| num_sectors
> max_sectors
)
1396 num_sectors
= max_sectors
;
1397 rdev
->sb_start
= sb_start
;
1399 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1400 sb
->data_size
= cpu_to_le64(num_sectors
);
1401 sb
->super_offset
= rdev
->sb_start
;
1402 sb
->sb_csum
= calc_sb_1_csum(sb
);
1403 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1405 md_super_wait(rdev
->mddev
);
1406 return num_sectors
/ 2; /* kB for sysfs */
1409 static struct super_type super_types
[] = {
1412 .owner
= THIS_MODULE
,
1413 .load_super
= super_90_load
,
1414 .validate_super
= super_90_validate
,
1415 .sync_super
= super_90_sync
,
1416 .rdev_size_change
= super_90_rdev_size_change
,
1420 .owner
= THIS_MODULE
,
1421 .load_super
= super_1_load
,
1422 .validate_super
= super_1_validate
,
1423 .sync_super
= super_1_sync
,
1424 .rdev_size_change
= super_1_rdev_size_change
,
1428 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1430 mdk_rdev_t
*rdev
, *rdev2
;
1433 rdev_for_each_rcu(rdev
, mddev1
)
1434 rdev_for_each_rcu(rdev2
, mddev2
)
1435 if (rdev
->bdev
->bd_contains
==
1436 rdev2
->bdev
->bd_contains
) {
1444 static LIST_HEAD(pending_raid_disks
);
1446 static void md_integrity_check(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1448 struct mdk_personality
*pers
= mddev
->pers
;
1449 struct gendisk
*disk
= mddev
->gendisk
;
1450 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1451 struct blk_integrity
*bi_mddev
= blk_get_integrity(disk
);
1453 /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
1454 if (pers
&& pers
->level
>= 4 && pers
->level
<= 6)
1457 /* If rdev is integrity capable, register profile for mddev */
1458 if (!bi_mddev
&& bi_rdev
) {
1459 if (blk_integrity_register(disk
, bi_rdev
))
1460 printk(KERN_ERR
"%s: %s Could not register integrity!\n",
1461 __func__
, disk
->disk_name
);
1463 printk(KERN_NOTICE
"Enabling data integrity on %s\n",
1468 /* Check that mddev and rdev have matching profiles */
1469 if (blk_integrity_compare(disk
, rdev
->bdev
->bd_disk
) < 0) {
1470 printk(KERN_ERR
"%s: %s/%s integrity mismatch!\n", __func__
,
1471 disk
->disk_name
, rdev
->bdev
->bd_disk
->disk_name
);
1472 printk(KERN_NOTICE
"Disabling data integrity on %s\n",
1474 blk_integrity_unregister(disk
);
1478 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1480 char b
[BDEVNAME_SIZE
];
1490 /* prevent duplicates */
1491 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1494 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1495 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1496 rdev
->sectors
< mddev
->dev_sectors
)) {
1498 /* Cannot change size, so fail
1499 * If mddev->level <= 0, then we don't care
1500 * about aligning sizes (e.g. linear)
1502 if (mddev
->level
> 0)
1505 mddev
->dev_sectors
= rdev
->sectors
;
1508 /* Verify rdev->desc_nr is unique.
1509 * If it is -1, assign a free number, else
1510 * check number is not in use
1512 if (rdev
->desc_nr
< 0) {
1514 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1515 while (find_rdev_nr(mddev
, choice
))
1517 rdev
->desc_nr
= choice
;
1519 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1522 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1523 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1524 mdname(mddev
), mddev
->max_disks
);
1527 bdevname(rdev
->bdev
,b
);
1528 while ( (s
=strchr(b
, '/')) != NULL
)
1531 rdev
->mddev
= mddev
;
1532 printk(KERN_INFO
"md: bind<%s>\n", b
);
1534 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1537 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1538 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1539 kobject_del(&rdev
->kobj
);
1542 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1544 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1545 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1547 /* May as well allow recovery to be retried once */
1548 mddev
->recovery_disabled
= 0;
1550 md_integrity_check(rdev
, mddev
);
1554 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1559 static void md_delayed_delete(struct work_struct
*ws
)
1561 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1562 kobject_del(&rdev
->kobj
);
1563 kobject_put(&rdev
->kobj
);
1566 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1568 char b
[BDEVNAME_SIZE
];
1573 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1574 list_del_rcu(&rdev
->same_set
);
1575 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1577 sysfs_remove_link(&rdev
->kobj
, "block");
1578 sysfs_put(rdev
->sysfs_state
);
1579 rdev
->sysfs_state
= NULL
;
1580 /* We need to delay this, otherwise we can deadlock when
1581 * writing to 'remove' to "dev/state". We also need
1582 * to delay it due to rcu usage.
1585 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1586 kobject_get(&rdev
->kobj
);
1587 schedule_work(&rdev
->del_work
);
1591 * prevent the device from being mounted, repartitioned or
1592 * otherwise reused by a RAID array (or any other kernel
1593 * subsystem), by bd_claiming the device.
1595 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1598 struct block_device
*bdev
;
1599 char b
[BDEVNAME_SIZE
];
1601 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1603 printk(KERN_ERR
"md: could not open %s.\n",
1604 __bdevname(dev
, b
));
1605 return PTR_ERR(bdev
);
1607 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1609 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1611 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1615 set_bit(AllReserved
, &rdev
->flags
);
1620 static void unlock_rdev(mdk_rdev_t
*rdev
)
1622 struct block_device
*bdev
= rdev
->bdev
;
1627 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1630 void md_autodetect_dev(dev_t dev
);
1632 static void export_rdev(mdk_rdev_t
* rdev
)
1634 char b
[BDEVNAME_SIZE
];
1635 printk(KERN_INFO
"md: export_rdev(%s)\n",
1636 bdevname(rdev
->bdev
,b
));
1641 if (test_bit(AutoDetected
, &rdev
->flags
))
1642 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1645 kobject_put(&rdev
->kobj
);
1648 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1650 unbind_rdev_from_array(rdev
);
1654 static void export_array(mddev_t
*mddev
)
1656 mdk_rdev_t
*rdev
, *tmp
;
1658 rdev_for_each(rdev
, tmp
, mddev
) {
1663 kick_rdev_from_array(rdev
);
1665 if (!list_empty(&mddev
->disks
))
1667 mddev
->raid_disks
= 0;
1668 mddev
->major_version
= 0;
1671 static void print_desc(mdp_disk_t
*desc
)
1673 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1674 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1677 static void print_sb_90(mdp_super_t
*sb
)
1682 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1683 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1684 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1686 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1687 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1688 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1689 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1690 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1691 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1692 sb
->failed_disks
, sb
->spare_disks
,
1693 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1696 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1699 desc
= sb
->disks
+ i
;
1700 if (desc
->number
|| desc
->major
|| desc
->minor
||
1701 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1702 printk(" D %2d: ", i
);
1706 printk(KERN_INFO
"md: THIS: ");
1707 print_desc(&sb
->this_disk
);
1710 static void print_sb_1(struct mdp_superblock_1
*sb
)
1714 uuid
= sb
->set_uuid
;
1715 printk(KERN_INFO
"md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1716 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1717 KERN_INFO
"md: Name: \"%s\" CT:%llu\n",
1718 le32_to_cpu(sb
->major_version
),
1719 le32_to_cpu(sb
->feature_map
),
1720 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1721 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1722 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1723 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1725 (unsigned long long)le64_to_cpu(sb
->ctime
)
1726 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1728 uuid
= sb
->device_uuid
;
1729 printk(KERN_INFO
"md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1731 KERN_INFO
"md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1732 ":%02x%02x%02x%02x%02x%02x\n"
1733 KERN_INFO
"md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1734 KERN_INFO
"md: (MaxDev:%u) \n",
1735 le32_to_cpu(sb
->level
),
1736 (unsigned long long)le64_to_cpu(sb
->size
),
1737 le32_to_cpu(sb
->raid_disks
),
1738 le32_to_cpu(sb
->layout
),
1739 le32_to_cpu(sb
->chunksize
),
1740 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1741 (unsigned long long)le64_to_cpu(sb
->data_size
),
1742 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1743 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1744 le32_to_cpu(sb
->dev_number
),
1745 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1746 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1747 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1748 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1750 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1751 (unsigned long long)le64_to_cpu(sb
->events
),
1752 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1753 le32_to_cpu(sb
->sb_csum
),
1754 le32_to_cpu(sb
->max_dev
)
1758 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1760 char b
[BDEVNAME_SIZE
];
1761 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1762 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
1763 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1765 if (rdev
->sb_loaded
) {
1766 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1767 switch (major_version
) {
1769 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1772 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
1776 printk(KERN_INFO
"md: no rdev superblock!\n");
1779 static void md_print_devices(void)
1781 struct list_head
*tmp
;
1784 char b
[BDEVNAME_SIZE
];
1787 printk("md: **********************************\n");
1788 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1789 printk("md: **********************************\n");
1790 for_each_mddev(mddev
, tmp
) {
1793 bitmap_print_sb(mddev
->bitmap
);
1795 printk("%s: ", mdname(mddev
));
1796 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1797 printk("<%s>", bdevname(rdev
->bdev
,b
));
1800 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1801 print_rdev(rdev
, mddev
->major_version
);
1803 printk("md: **********************************\n");
1808 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1810 /* Update each superblock (in-memory image), but
1811 * if we are allowed to, skip spares which already
1812 * have the right event counter, or have one earlier
1813 * (which would mean they aren't being marked as dirty
1814 * with the rest of the array)
1818 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1819 if (rdev
->sb_events
== mddev
->events
||
1821 rdev
->raid_disk
< 0 &&
1822 (rdev
->sb_events
&1)==0 &&
1823 rdev
->sb_events
+1 == mddev
->events
)) {
1824 /* Don't update this superblock */
1825 rdev
->sb_loaded
= 2;
1827 super_types
[mddev
->major_version
].
1828 sync_super(mddev
, rdev
);
1829 rdev
->sb_loaded
= 1;
1834 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1840 if (mddev
->external
)
1843 spin_lock_irq(&mddev
->write_lock
);
1845 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1846 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1848 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1849 /* just a clean<-> dirty transition, possibly leave spares alone,
1850 * though if events isn't the right even/odd, we will have to do
1856 if (mddev
->degraded
)
1857 /* If the array is degraded, then skipping spares is both
1858 * dangerous and fairly pointless.
1859 * Dangerous because a device that was removed from the array
1860 * might have a event_count that still looks up-to-date,
1861 * so it can be re-added without a resync.
1862 * Pointless because if there are any spares to skip,
1863 * then a recovery will happen and soon that array won't
1864 * be degraded any more and the spare can go back to sleep then.
1868 sync_req
= mddev
->in_sync
;
1869 mddev
->utime
= get_seconds();
1871 /* If this is just a dirty<->clean transition, and the array is clean
1872 * and 'events' is odd, we can roll back to the previous clean state */
1874 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1875 && (mddev
->events
& 1)
1876 && mddev
->events
!= 1)
1879 /* otherwise we have to go forward and ... */
1881 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1882 /* .. if the array isn't clean, insist on an odd 'events' */
1883 if ((mddev
->events
&1)==0) {
1888 /* otherwise insist on an even 'events' (for clean states) */
1889 if ((mddev
->events
&1)) {
1896 if (!mddev
->events
) {
1898 * oops, this 64-bit counter should never wrap.
1899 * Either we are in around ~1 trillion A.C., assuming
1900 * 1 reboot per second, or we have a bug:
1907 * do not write anything to disk if using
1908 * nonpersistent superblocks
1910 if (!mddev
->persistent
) {
1911 if (!mddev
->external
)
1912 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1914 spin_unlock_irq(&mddev
->write_lock
);
1915 wake_up(&mddev
->sb_wait
);
1918 sync_sbs(mddev
, nospares
);
1919 spin_unlock_irq(&mddev
->write_lock
);
1922 "md: updating %s RAID superblock on device (in sync %d)\n",
1923 mdname(mddev
),mddev
->in_sync
);
1925 bitmap_update_sb(mddev
->bitmap
);
1926 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1927 char b
[BDEVNAME_SIZE
];
1928 dprintk(KERN_INFO
"md: ");
1929 if (rdev
->sb_loaded
!= 1)
1930 continue; /* no noise on spare devices */
1931 if (test_bit(Faulty
, &rdev
->flags
))
1932 dprintk("(skipping faulty ");
1934 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1935 if (!test_bit(Faulty
, &rdev
->flags
)) {
1936 md_super_write(mddev
,rdev
,
1937 rdev
->sb_start
, rdev
->sb_size
,
1939 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1940 bdevname(rdev
->bdev
,b
),
1941 (unsigned long long)rdev
->sb_start
);
1942 rdev
->sb_events
= mddev
->events
;
1946 if (mddev
->level
== LEVEL_MULTIPATH
)
1947 /* only need to write one superblock... */
1950 md_super_wait(mddev
);
1951 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1953 spin_lock_irq(&mddev
->write_lock
);
1954 if (mddev
->in_sync
!= sync_req
||
1955 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1956 /* have to write it out again */
1957 spin_unlock_irq(&mddev
->write_lock
);
1960 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1961 spin_unlock_irq(&mddev
->write_lock
);
1962 wake_up(&mddev
->sb_wait
);
1966 /* words written to sysfs files may, or may not, be \n terminated.
1967 * We want to accept with case. For this we use cmd_match.
1969 static int cmd_match(const char *cmd
, const char *str
)
1971 /* See if cmd, written into a sysfs file, matches
1972 * str. They must either be the same, or cmd can
1973 * have a trailing newline
1975 while (*cmd
&& *str
&& *cmd
== *str
) {
1986 struct rdev_sysfs_entry
{
1987 struct attribute attr
;
1988 ssize_t (*show
)(mdk_rdev_t
*, char *);
1989 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1993 state_show(mdk_rdev_t
*rdev
, char *page
)
1998 if (test_bit(Faulty
, &rdev
->flags
)) {
1999 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2002 if (test_bit(In_sync
, &rdev
->flags
)) {
2003 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2006 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2007 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2010 if (test_bit(Blocked
, &rdev
->flags
)) {
2011 len
+= sprintf(page
+len
, "%sblocked", sep
);
2014 if (!test_bit(Faulty
, &rdev
->flags
) &&
2015 !test_bit(In_sync
, &rdev
->flags
)) {
2016 len
+= sprintf(page
+len
, "%sspare", sep
);
2019 return len
+sprintf(page
+len
, "\n");
2023 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2026 * faulty - simulates and error
2027 * remove - disconnects the device
2028 * writemostly - sets write_mostly
2029 * -writemostly - clears write_mostly
2030 * blocked - sets the Blocked flag
2031 * -blocked - clears the Blocked flag
2034 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2035 md_error(rdev
->mddev
, rdev
);
2037 } else if (cmd_match(buf
, "remove")) {
2038 if (rdev
->raid_disk
>= 0)
2041 mddev_t
*mddev
= rdev
->mddev
;
2042 kick_rdev_from_array(rdev
);
2044 md_update_sb(mddev
, 1);
2045 md_new_event(mddev
);
2048 } else if (cmd_match(buf
, "writemostly")) {
2049 set_bit(WriteMostly
, &rdev
->flags
);
2051 } else if (cmd_match(buf
, "-writemostly")) {
2052 clear_bit(WriteMostly
, &rdev
->flags
);
2054 } else if (cmd_match(buf
, "blocked")) {
2055 set_bit(Blocked
, &rdev
->flags
);
2057 } else if (cmd_match(buf
, "-blocked")) {
2058 clear_bit(Blocked
, &rdev
->flags
);
2059 wake_up(&rdev
->blocked_wait
);
2060 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2061 md_wakeup_thread(rdev
->mddev
->thread
);
2065 if (!err
&& rdev
->sysfs_state
)
2066 sysfs_notify_dirent(rdev
->sysfs_state
);
2067 return err
? err
: len
;
2069 static struct rdev_sysfs_entry rdev_state
=
2070 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2073 errors_show(mdk_rdev_t
*rdev
, char *page
)
2075 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2079 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2082 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2083 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2084 atomic_set(&rdev
->corrected_errors
, n
);
2089 static struct rdev_sysfs_entry rdev_errors
=
2090 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2093 slot_show(mdk_rdev_t
*rdev
, char *page
)
2095 if (rdev
->raid_disk
< 0)
2096 return sprintf(page
, "none\n");
2098 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2102 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2107 int slot
= simple_strtoul(buf
, &e
, 10);
2108 if (strncmp(buf
, "none", 4)==0)
2110 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2112 if (rdev
->mddev
->pers
&& slot
== -1) {
2113 /* Setting 'slot' on an active array requires also
2114 * updating the 'rd%d' link, and communicating
2115 * with the personality with ->hot_*_disk.
2116 * For now we only support removing
2117 * failed/spare devices. This normally happens automatically,
2118 * but not when the metadata is externally managed.
2120 if (rdev
->raid_disk
== -1)
2122 /* personality does all needed checks */
2123 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2125 err
= rdev
->mddev
->pers
->
2126 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2129 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2130 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2131 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2132 md_wakeup_thread(rdev
->mddev
->thread
);
2133 } else if (rdev
->mddev
->pers
) {
2135 /* Activating a spare .. or possibly reactivating
2136 * if we every get bitmaps working here.
2139 if (rdev
->raid_disk
!= -1)
2142 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2145 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2146 if (rdev2
->raid_disk
== slot
)
2149 rdev
->raid_disk
= slot
;
2150 if (test_bit(In_sync
, &rdev
->flags
))
2151 rdev
->saved_raid_disk
= slot
;
2153 rdev
->saved_raid_disk
= -1;
2154 err
= rdev
->mddev
->pers
->
2155 hot_add_disk(rdev
->mddev
, rdev
);
2157 rdev
->raid_disk
= -1;
2160 sysfs_notify_dirent(rdev
->sysfs_state
);
2161 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2162 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2164 "md: cannot register "
2166 nm
, mdname(rdev
->mddev
));
2168 /* don't wakeup anyone, leave that to userspace. */
2170 if (slot
>= rdev
->mddev
->raid_disks
)
2172 rdev
->raid_disk
= slot
;
2173 /* assume it is working */
2174 clear_bit(Faulty
, &rdev
->flags
);
2175 clear_bit(WriteMostly
, &rdev
->flags
);
2176 set_bit(In_sync
, &rdev
->flags
);
2177 sysfs_notify_dirent(rdev
->sysfs_state
);
2183 static struct rdev_sysfs_entry rdev_slot
=
2184 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2187 offset_show(mdk_rdev_t
*rdev
, char *page
)
2189 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2193 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2196 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2197 if (e
==buf
|| (*e
&& *e
!= '\n'))
2199 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2201 if (rdev
->sectors
&& rdev
->mddev
->external
)
2202 /* Must set offset before size, so overlap checks
2205 rdev
->data_offset
= offset
;
2209 static struct rdev_sysfs_entry rdev_offset
=
2210 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2213 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2215 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2218 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2220 /* check if two start/length pairs overlap */
2229 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2231 mddev_t
*my_mddev
= rdev
->mddev
;
2232 sector_t oldsectors
= rdev
->sectors
;
2233 unsigned long long sectors
;
2235 if (strict_strtoull(buf
, 10, §ors
) < 0)
2238 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2239 if (my_mddev
->persistent
) {
2240 sectors
= super_types
[my_mddev
->major_version
].
2241 rdev_size_change(rdev
, sectors
);
2244 } else if (!sectors
)
2245 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2248 if (sectors
< my_mddev
->dev_sectors
)
2249 return -EINVAL
; /* component must fit device */
2251 rdev
->sectors
= sectors
;
2252 if (sectors
> oldsectors
&& my_mddev
->external
) {
2253 /* need to check that all other rdevs with the same ->bdev
2254 * do not overlap. We need to unlock the mddev to avoid
2255 * a deadlock. We have already changed rdev->sectors, and if
2256 * we have to change it back, we will have the lock again.
2260 struct list_head
*tmp
;
2262 mddev_unlock(my_mddev
);
2263 for_each_mddev(mddev
, tmp
) {
2267 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2268 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2269 (rdev
->bdev
== rdev2
->bdev
&&
2271 overlaps(rdev
->data_offset
, rdev
->sectors
,
2277 mddev_unlock(mddev
);
2283 mddev_lock(my_mddev
);
2285 /* Someone else could have slipped in a size
2286 * change here, but doing so is just silly.
2287 * We put oldsectors back because we *know* it is
2288 * safe, and trust userspace not to race with
2291 rdev
->sectors
= oldsectors
;
2298 static struct rdev_sysfs_entry rdev_size
=
2299 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2301 static struct attribute
*rdev_default_attrs
[] = {
2310 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2312 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2313 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2314 mddev_t
*mddev
= rdev
->mddev
;
2320 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2322 if (rdev
->mddev
== NULL
)
2325 rv
= entry
->show(rdev
, page
);
2326 mddev_unlock(mddev
);
2332 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2333 const char *page
, size_t length
)
2335 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2336 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2338 mddev_t
*mddev
= rdev
->mddev
;
2342 if (!capable(CAP_SYS_ADMIN
))
2344 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2346 if (rdev
->mddev
== NULL
)
2349 rv
= entry
->store(rdev
, page
, length
);
2350 mddev_unlock(mddev
);
2355 static void rdev_free(struct kobject
*ko
)
2357 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2360 static struct sysfs_ops rdev_sysfs_ops
= {
2361 .show
= rdev_attr_show
,
2362 .store
= rdev_attr_store
,
2364 static struct kobj_type rdev_ktype
= {
2365 .release
= rdev_free
,
2366 .sysfs_ops
= &rdev_sysfs_ops
,
2367 .default_attrs
= rdev_default_attrs
,
2371 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2373 * mark the device faulty if:
2375 * - the device is nonexistent (zero size)
2376 * - the device has no valid superblock
2378 * a faulty rdev _never_ has rdev->sb set.
2380 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2382 char b
[BDEVNAME_SIZE
];
2387 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2389 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2390 return ERR_PTR(-ENOMEM
);
2393 if ((err
= alloc_disk_sb(rdev
)))
2396 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2400 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2403 rdev
->saved_raid_disk
= -1;
2404 rdev
->raid_disk
= -1;
2406 rdev
->data_offset
= 0;
2407 rdev
->sb_events
= 0;
2408 atomic_set(&rdev
->nr_pending
, 0);
2409 atomic_set(&rdev
->read_errors
, 0);
2410 atomic_set(&rdev
->corrected_errors
, 0);
2412 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2415 "md: %s has zero or unknown size, marking faulty!\n",
2416 bdevname(rdev
->bdev
,b
));
2421 if (super_format
>= 0) {
2422 err
= super_types
[super_format
].
2423 load_super(rdev
, NULL
, super_minor
);
2424 if (err
== -EINVAL
) {
2426 "md: %s does not have a valid v%d.%d "
2427 "superblock, not importing!\n",
2428 bdevname(rdev
->bdev
,b
),
2429 super_format
, super_minor
);
2434 "md: could not read %s's sb, not importing!\n",
2435 bdevname(rdev
->bdev
,b
));
2440 INIT_LIST_HEAD(&rdev
->same_set
);
2441 init_waitqueue_head(&rdev
->blocked_wait
);
2446 if (rdev
->sb_page
) {
2452 return ERR_PTR(err
);
2456 * Check a full RAID array for plausibility
2460 static void analyze_sbs(mddev_t
* mddev
)
2463 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2464 char b
[BDEVNAME_SIZE
];
2467 rdev_for_each(rdev
, tmp
, mddev
)
2468 switch (super_types
[mddev
->major_version
].
2469 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2477 "md: fatal superblock inconsistency in %s"
2478 " -- removing from array\n",
2479 bdevname(rdev
->bdev
,b
));
2480 kick_rdev_from_array(rdev
);
2484 super_types
[mddev
->major_version
].
2485 validate_super(mddev
, freshest
);
2488 rdev_for_each(rdev
, tmp
, mddev
) {
2489 if (rdev
->desc_nr
>= mddev
->max_disks
||
2490 i
> mddev
->max_disks
) {
2492 "md: %s: %s: only %d devices permitted\n",
2493 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2495 kick_rdev_from_array(rdev
);
2498 if (rdev
!= freshest
)
2499 if (super_types
[mddev
->major_version
].
2500 validate_super(mddev
, rdev
)) {
2501 printk(KERN_WARNING
"md: kicking non-fresh %s"
2503 bdevname(rdev
->bdev
,b
));
2504 kick_rdev_from_array(rdev
);
2507 if (mddev
->level
== LEVEL_MULTIPATH
) {
2508 rdev
->desc_nr
= i
++;
2509 rdev
->raid_disk
= rdev
->desc_nr
;
2510 set_bit(In_sync
, &rdev
->flags
);
2511 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2512 rdev
->raid_disk
= -1;
2513 clear_bit(In_sync
, &rdev
->flags
);
2519 if (mddev
->recovery_cp
!= MaxSector
&&
2521 printk(KERN_ERR
"md: %s: raid array is not clean"
2522 " -- starting background reconstruction\n",
2527 static void md_safemode_timeout(unsigned long data
);
2530 safe_delay_show(mddev_t
*mddev
, char *page
)
2532 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2533 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2536 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2544 /* remove a period, and count digits after it */
2545 if (len
>= sizeof(buf
))
2547 strlcpy(buf
, cbuf
, sizeof(buf
));
2548 for (i
=0; i
<len
; i
++) {
2550 if (isdigit(buf
[i
])) {
2555 } else if (buf
[i
] == '.') {
2560 if (strict_strtoul(buf
, 10, &msec
) < 0)
2562 msec
= (msec
* 1000) / scale
;
2564 mddev
->safemode_delay
= 0;
2566 unsigned long old_delay
= mddev
->safemode_delay
;
2567 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2568 if (mddev
->safemode_delay
== 0)
2569 mddev
->safemode_delay
= 1;
2570 if (mddev
->safemode_delay
< old_delay
)
2571 md_safemode_timeout((unsigned long)mddev
);
2575 static struct md_sysfs_entry md_safe_delay
=
2576 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2579 level_show(mddev_t
*mddev
, char *page
)
2581 struct mdk_personality
*p
= mddev
->pers
;
2583 return sprintf(page
, "%s\n", p
->name
);
2584 else if (mddev
->clevel
[0])
2585 return sprintf(page
, "%s\n", mddev
->clevel
);
2586 else if (mddev
->level
!= LEVEL_NONE
)
2587 return sprintf(page
, "%d\n", mddev
->level
);
2593 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2600 if (len
>= sizeof(mddev
->clevel
))
2602 strncpy(mddev
->clevel
, buf
, len
);
2603 if (mddev
->clevel
[len
-1] == '\n')
2605 mddev
->clevel
[len
] = 0;
2606 mddev
->level
= LEVEL_NONE
;
2610 static struct md_sysfs_entry md_level
=
2611 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2615 layout_show(mddev_t
*mddev
, char *page
)
2617 /* just a number, not meaningful for all levels */
2618 if (mddev
->reshape_position
!= MaxSector
&&
2619 mddev
->layout
!= mddev
->new_layout
)
2620 return sprintf(page
, "%d (%d)\n",
2621 mddev
->new_layout
, mddev
->layout
);
2622 return sprintf(page
, "%d\n", mddev
->layout
);
2626 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2629 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2631 if (!*buf
|| (*e
&& *e
!= '\n'))
2637 mddev
->new_layout
= n
;
2638 if (mddev
->reshape_position
== MaxSector
)
2642 static struct md_sysfs_entry md_layout
=
2643 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2647 raid_disks_show(mddev_t
*mddev
, char *page
)
2649 if (mddev
->raid_disks
== 0)
2651 if (mddev
->reshape_position
!= MaxSector
&&
2652 mddev
->delta_disks
!= 0)
2653 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2654 mddev
->raid_disks
- mddev
->delta_disks
);
2655 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2658 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2661 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2665 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2667 if (!*buf
|| (*e
&& *e
!= '\n'))
2671 rv
= update_raid_disks(mddev
, n
);
2672 else if (mddev
->reshape_position
!= MaxSector
) {
2673 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2674 mddev
->delta_disks
= n
- olddisks
;
2675 mddev
->raid_disks
= n
;
2677 mddev
->raid_disks
= n
;
2678 return rv
? rv
: len
;
2680 static struct md_sysfs_entry md_raid_disks
=
2681 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2684 chunk_size_show(mddev_t
*mddev
, char *page
)
2686 if (mddev
->reshape_position
!= MaxSector
&&
2687 mddev
->chunk_size
!= mddev
->new_chunk
)
2688 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2690 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2694 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2696 /* can only set chunk_size if array is not yet active */
2698 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2700 if (!*buf
|| (*e
&& *e
!= '\n'))
2706 mddev
->new_chunk
= n
;
2707 if (mddev
->reshape_position
== MaxSector
)
2708 mddev
->chunk_size
= n
;
2711 static struct md_sysfs_entry md_chunk_size
=
2712 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2715 resync_start_show(mddev_t
*mddev
, char *page
)
2717 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2721 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2724 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2728 if (!*buf
|| (*e
&& *e
!= '\n'))
2731 mddev
->recovery_cp
= n
;
2734 static struct md_sysfs_entry md_resync_start
=
2735 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2738 * The array state can be:
2741 * No devices, no size, no level
2742 * Equivalent to STOP_ARRAY ioctl
2744 * May have some settings, but array is not active
2745 * all IO results in error
2746 * When written, doesn't tear down array, but just stops it
2747 * suspended (not supported yet)
2748 * All IO requests will block. The array can be reconfigured.
2749 * Writing this, if accepted, will block until array is quiescent
2751 * no resync can happen. no superblocks get written.
2752 * write requests fail
2754 * like readonly, but behaves like 'clean' on a write request.
2756 * clean - no pending writes, but otherwise active.
2757 * When written to inactive array, starts without resync
2758 * If a write request arrives then
2759 * if metadata is known, mark 'dirty' and switch to 'active'.
2760 * if not known, block and switch to write-pending
2761 * If written to an active array that has pending writes, then fails.
2763 * fully active: IO and resync can be happening.
2764 * When written to inactive array, starts with resync
2767 * clean, but writes are blocked waiting for 'active' to be written.
2770 * like active, but no writes have been seen for a while (100msec).
2773 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2774 write_pending
, active_idle
, bad_word
};
2775 static char *array_states
[] = {
2776 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2777 "write-pending", "active-idle", NULL
};
2779 static int match_word(const char *word
, char **list
)
2782 for (n
=0; list
[n
]; n
++)
2783 if (cmd_match(word
, list
[n
]))
2789 array_state_show(mddev_t
*mddev
, char *page
)
2791 enum array_state st
= inactive
;
2804 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2806 else if (mddev
->safemode
)
2812 if (list_empty(&mddev
->disks
) &&
2813 mddev
->raid_disks
== 0 &&
2814 mddev
->dev_sectors
== 0)
2819 return sprintf(page
, "%s\n", array_states
[st
]);
2822 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2823 static int do_md_run(mddev_t
* mddev
);
2824 static int restart_array(mddev_t
*mddev
);
2827 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2830 enum array_state st
= match_word(buf
, array_states
);
2835 /* stopping an active array */
2836 if (atomic_read(&mddev
->openers
) > 0)
2838 err
= do_md_stop(mddev
, 0, 0);
2841 /* stopping an active array */
2843 if (atomic_read(&mddev
->openers
) > 0)
2845 err
= do_md_stop(mddev
, 2, 0);
2847 err
= 0; /* already inactive */
2850 break; /* not supported yet */
2853 err
= do_md_stop(mddev
, 1, 0);
2856 set_disk_ro(mddev
->gendisk
, 1);
2857 err
= do_md_run(mddev
);
2863 err
= do_md_stop(mddev
, 1, 0);
2864 else if (mddev
->ro
== 1)
2865 err
= restart_array(mddev
);
2868 set_disk_ro(mddev
->gendisk
, 0);
2872 err
= do_md_run(mddev
);
2877 restart_array(mddev
);
2878 spin_lock_irq(&mddev
->write_lock
);
2879 if (atomic_read(&mddev
->writes_pending
) == 0) {
2880 if (mddev
->in_sync
== 0) {
2882 if (mddev
->safemode
== 1)
2883 mddev
->safemode
= 0;
2884 if (mddev
->persistent
)
2885 set_bit(MD_CHANGE_CLEAN
,
2891 spin_unlock_irq(&mddev
->write_lock
);
2894 mddev
->recovery_cp
= MaxSector
;
2895 err
= do_md_run(mddev
);
2900 restart_array(mddev
);
2901 if (mddev
->external
)
2902 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2903 wake_up(&mddev
->sb_wait
);
2907 set_disk_ro(mddev
->gendisk
, 0);
2908 err
= do_md_run(mddev
);
2913 /* these cannot be set */
2919 sysfs_notify_dirent(mddev
->sysfs_state
);
2923 static struct md_sysfs_entry md_array_state
=
2924 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2927 null_show(mddev_t
*mddev
, char *page
)
2933 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2935 /* buf must be %d:%d\n? giving major and minor numbers */
2936 /* The new device is added to the array.
2937 * If the array has a persistent superblock, we read the
2938 * superblock to initialise info and check validity.
2939 * Otherwise, only checking done is that in bind_rdev_to_array,
2940 * which mainly checks size.
2943 int major
= simple_strtoul(buf
, &e
, 10);
2949 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2951 minor
= simple_strtoul(e
+1, &e
, 10);
2952 if (*e
&& *e
!= '\n')
2954 dev
= MKDEV(major
, minor
);
2955 if (major
!= MAJOR(dev
) ||
2956 minor
!= MINOR(dev
))
2960 if (mddev
->persistent
) {
2961 rdev
= md_import_device(dev
, mddev
->major_version
,
2962 mddev
->minor_version
);
2963 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2964 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2965 mdk_rdev_t
, same_set
);
2966 err
= super_types
[mddev
->major_version
]
2967 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2971 } else if (mddev
->external
)
2972 rdev
= md_import_device(dev
, -2, -1);
2974 rdev
= md_import_device(dev
, -1, -1);
2977 return PTR_ERR(rdev
);
2978 err
= bind_rdev_to_array(rdev
, mddev
);
2982 return err
? err
: len
;
2985 static struct md_sysfs_entry md_new_device
=
2986 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2989 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2992 unsigned long chunk
, end_chunk
;
2996 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2998 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2999 if (buf
== end
) break;
3000 if (*end
== '-') { /* range */
3002 end_chunk
= simple_strtoul(buf
, &end
, 0);
3003 if (buf
== end
) break;
3005 if (*end
&& !isspace(*end
)) break;
3006 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3008 while (isspace(*buf
)) buf
++;
3010 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3015 static struct md_sysfs_entry md_bitmap
=
3016 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3019 size_show(mddev_t
*mddev
, char *page
)
3021 return sprintf(page
, "%llu\n",
3022 (unsigned long long)mddev
->dev_sectors
/ 2);
3025 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3028 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3030 /* If array is inactive, we can reduce the component size, but
3031 * not increase it (except from 0).
3032 * If array is active, we can try an on-line resize
3034 unsigned long long sectors
;
3035 int err
= strict_strtoull(buf
, 10, §ors
);
3041 err
= update_size(mddev
, sectors
);
3042 md_update_sb(mddev
, 1);
3044 if (mddev
->dev_sectors
== 0 ||
3045 mddev
->dev_sectors
> sectors
)
3046 mddev
->dev_sectors
= sectors
;
3050 return err
? err
: len
;
3053 static struct md_sysfs_entry md_size
=
3054 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3059 * 'none' for arrays with no metadata (good luck...)
3060 * 'external' for arrays with externally managed metadata,
3061 * or N.M for internally known formats
3064 metadata_show(mddev_t
*mddev
, char *page
)
3066 if (mddev
->persistent
)
3067 return sprintf(page
, "%d.%d\n",
3068 mddev
->major_version
, mddev
->minor_version
);
3069 else if (mddev
->external
)
3070 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3072 return sprintf(page
, "none\n");
3076 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3080 /* Changing the details of 'external' metadata is
3081 * always permitted. Otherwise there must be
3082 * no devices attached to the array.
3084 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3086 else if (!list_empty(&mddev
->disks
))
3089 if (cmd_match(buf
, "none")) {
3090 mddev
->persistent
= 0;
3091 mddev
->external
= 0;
3092 mddev
->major_version
= 0;
3093 mddev
->minor_version
= 90;
3096 if (strncmp(buf
, "external:", 9) == 0) {
3097 size_t namelen
= len
-9;
3098 if (namelen
>= sizeof(mddev
->metadata_type
))
3099 namelen
= sizeof(mddev
->metadata_type
)-1;
3100 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3101 mddev
->metadata_type
[namelen
] = 0;
3102 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3103 mddev
->metadata_type
[--namelen
] = 0;
3104 mddev
->persistent
= 0;
3105 mddev
->external
= 1;
3106 mddev
->major_version
= 0;
3107 mddev
->minor_version
= 90;
3110 major
= simple_strtoul(buf
, &e
, 10);
3111 if (e
==buf
|| *e
!= '.')
3114 minor
= simple_strtoul(buf
, &e
, 10);
3115 if (e
==buf
|| (*e
&& *e
!= '\n') )
3117 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3119 mddev
->major_version
= major
;
3120 mddev
->minor_version
= minor
;
3121 mddev
->persistent
= 1;
3122 mddev
->external
= 0;
3126 static struct md_sysfs_entry md_metadata
=
3127 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3130 action_show(mddev_t
*mddev
, char *page
)
3132 char *type
= "idle";
3133 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3134 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3135 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3137 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3138 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3140 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3144 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3147 return sprintf(page
, "%s\n", type
);
3151 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3153 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3156 if (cmd_match(page
, "idle")) {
3157 if (mddev
->sync_thread
) {
3158 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3159 md_unregister_thread(mddev
->sync_thread
);
3160 mddev
->sync_thread
= NULL
;
3161 mddev
->recovery
= 0;
3163 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3164 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3166 else if (cmd_match(page
, "resync"))
3167 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3168 else if (cmd_match(page
, "recover")) {
3169 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3170 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3171 } else if (cmd_match(page
, "reshape")) {
3173 if (mddev
->pers
->start_reshape
== NULL
)
3175 err
= mddev
->pers
->start_reshape(mddev
);
3178 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3180 if (cmd_match(page
, "check"))
3181 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3182 else if (!cmd_match(page
, "repair"))
3184 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3185 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3187 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3188 md_wakeup_thread(mddev
->thread
);
3189 sysfs_notify_dirent(mddev
->sysfs_action
);
3194 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3196 return sprintf(page
, "%llu\n",
3197 (unsigned long long) mddev
->resync_mismatches
);
3200 static struct md_sysfs_entry md_scan_mode
=
3201 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3204 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3207 sync_min_show(mddev_t
*mddev
, char *page
)
3209 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3210 mddev
->sync_speed_min
? "local": "system");
3214 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3218 if (strncmp(buf
, "system", 6)==0) {
3219 mddev
->sync_speed_min
= 0;
3222 min
= simple_strtoul(buf
, &e
, 10);
3223 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3225 mddev
->sync_speed_min
= min
;
3229 static struct md_sysfs_entry md_sync_min
=
3230 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3233 sync_max_show(mddev_t
*mddev
, char *page
)
3235 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3236 mddev
->sync_speed_max
? "local": "system");
3240 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3244 if (strncmp(buf
, "system", 6)==0) {
3245 mddev
->sync_speed_max
= 0;
3248 max
= simple_strtoul(buf
, &e
, 10);
3249 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3251 mddev
->sync_speed_max
= max
;
3255 static struct md_sysfs_entry md_sync_max
=
3256 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3259 degraded_show(mddev_t
*mddev
, char *page
)
3261 return sprintf(page
, "%d\n", mddev
->degraded
);
3263 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3266 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3268 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3272 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3276 if (strict_strtol(buf
, 10, &n
))
3279 if (n
!= 0 && n
!= 1)
3282 mddev
->parallel_resync
= n
;
3284 if (mddev
->sync_thread
)
3285 wake_up(&resync_wait
);
3290 /* force parallel resync, even with shared block devices */
3291 static struct md_sysfs_entry md_sync_force_parallel
=
3292 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3293 sync_force_parallel_show
, sync_force_parallel_store
);
3296 sync_speed_show(mddev_t
*mddev
, char *page
)
3298 unsigned long resync
, dt
, db
;
3299 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3300 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3302 db
= resync
- mddev
->resync_mark_cnt
;
3303 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3306 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3309 sync_completed_show(mddev_t
*mddev
, char *page
)
3311 unsigned long max_sectors
, resync
;
3313 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3314 max_sectors
= mddev
->resync_max_sectors
;
3316 max_sectors
= mddev
->dev_sectors
;
3318 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3319 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3322 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3325 min_sync_show(mddev_t
*mddev
, char *page
)
3327 return sprintf(page
, "%llu\n",
3328 (unsigned long long)mddev
->resync_min
);
3331 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3333 unsigned long long min
;
3334 if (strict_strtoull(buf
, 10, &min
))
3336 if (min
> mddev
->resync_max
)
3338 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3341 /* Must be a multiple of chunk_size */
3342 if (mddev
->chunk_size
) {
3343 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3346 mddev
->resync_min
= min
;
3351 static struct md_sysfs_entry md_min_sync
=
3352 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3355 max_sync_show(mddev_t
*mddev
, char *page
)
3357 if (mddev
->resync_max
== MaxSector
)
3358 return sprintf(page
, "max\n");
3360 return sprintf(page
, "%llu\n",
3361 (unsigned long long)mddev
->resync_max
);
3364 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3366 if (strncmp(buf
, "max", 3) == 0)
3367 mddev
->resync_max
= MaxSector
;
3369 unsigned long long max
;
3370 if (strict_strtoull(buf
, 10, &max
))
3372 if (max
< mddev
->resync_min
)
3374 if (max
< mddev
->resync_max
&&
3375 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3378 /* Must be a multiple of chunk_size */
3379 if (mddev
->chunk_size
) {
3380 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3383 mddev
->resync_max
= max
;
3385 wake_up(&mddev
->recovery_wait
);
3389 static struct md_sysfs_entry md_max_sync
=
3390 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3393 suspend_lo_show(mddev_t
*mddev
, char *page
)
3395 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3399 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3402 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3404 if (mddev
->pers
->quiesce
== NULL
)
3406 if (buf
== e
|| (*e
&& *e
!= '\n'))
3408 if (new >= mddev
->suspend_hi
||
3409 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3410 mddev
->suspend_lo
= new;
3411 mddev
->pers
->quiesce(mddev
, 2);
3416 static struct md_sysfs_entry md_suspend_lo
=
3417 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3421 suspend_hi_show(mddev_t
*mddev
, char *page
)
3423 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3427 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3430 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3432 if (mddev
->pers
->quiesce
== NULL
)
3434 if (buf
== e
|| (*e
&& *e
!= '\n'))
3436 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3437 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3438 mddev
->suspend_hi
= new;
3439 mddev
->pers
->quiesce(mddev
, 1);
3440 mddev
->pers
->quiesce(mddev
, 0);
3445 static struct md_sysfs_entry md_suspend_hi
=
3446 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3449 reshape_position_show(mddev_t
*mddev
, char *page
)
3451 if (mddev
->reshape_position
!= MaxSector
)
3452 return sprintf(page
, "%llu\n",
3453 (unsigned long long)mddev
->reshape_position
);
3454 strcpy(page
, "none\n");
3459 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3462 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3465 if (buf
== e
|| (*e
&& *e
!= '\n'))
3467 mddev
->reshape_position
= new;
3468 mddev
->delta_disks
= 0;
3469 mddev
->new_level
= mddev
->level
;
3470 mddev
->new_layout
= mddev
->layout
;
3471 mddev
->new_chunk
= mddev
->chunk_size
;
3475 static struct md_sysfs_entry md_reshape_position
=
3476 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3477 reshape_position_store
);
3480 static struct attribute
*md_default_attrs
[] = {
3483 &md_raid_disks
.attr
,
3484 &md_chunk_size
.attr
,
3486 &md_resync_start
.attr
,
3488 &md_new_device
.attr
,
3489 &md_safe_delay
.attr
,
3490 &md_array_state
.attr
,
3491 &md_reshape_position
.attr
,
3495 static struct attribute
*md_redundancy_attrs
[] = {
3497 &md_mismatches
.attr
,
3500 &md_sync_speed
.attr
,
3501 &md_sync_force_parallel
.attr
,
3502 &md_sync_completed
.attr
,
3505 &md_suspend_lo
.attr
,
3506 &md_suspend_hi
.attr
,
3511 static struct attribute_group md_redundancy_group
= {
3513 .attrs
= md_redundancy_attrs
,
3518 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3520 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3521 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3526 rv
= mddev_lock(mddev
);
3528 rv
= entry
->show(mddev
, page
);
3529 mddev_unlock(mddev
);
3535 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3536 const char *page
, size_t length
)
3538 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3539 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3544 if (!capable(CAP_SYS_ADMIN
))
3546 rv
= mddev_lock(mddev
);
3547 if (mddev
->hold_active
== UNTIL_IOCTL
)
3548 mddev
->hold_active
= 0;
3550 rv
= entry
->store(mddev
, page
, length
);
3551 mddev_unlock(mddev
);
3556 static void md_free(struct kobject
*ko
)
3558 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3560 if (mddev
->sysfs_state
)
3561 sysfs_put(mddev
->sysfs_state
);
3563 if (mddev
->gendisk
) {
3564 del_gendisk(mddev
->gendisk
);
3565 put_disk(mddev
->gendisk
);
3568 blk_cleanup_queue(mddev
->queue
);
3573 static struct sysfs_ops md_sysfs_ops
= {
3574 .show
= md_attr_show
,
3575 .store
= md_attr_store
,
3577 static struct kobj_type md_ktype
= {
3579 .sysfs_ops
= &md_sysfs_ops
,
3580 .default_attrs
= md_default_attrs
,
3585 static int md_alloc(dev_t dev
, char *name
)
3587 static DEFINE_MUTEX(disks_mutex
);
3588 mddev_t
*mddev
= mddev_find(dev
);
3589 struct gendisk
*disk
;
3598 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
3599 shift
= partitioned
? MdpMinorShift
: 0;
3600 unit
= MINOR(mddev
->unit
) >> shift
;
3602 /* wait for any previous instance if this device
3603 * to be completed removed (mddev_delayed_delete).
3605 flush_scheduled_work();
3607 mutex_lock(&disks_mutex
);
3608 if (mddev
->gendisk
) {
3609 mutex_unlock(&disks_mutex
);
3615 /* Need to ensure that 'name' is not a duplicate.
3618 spin_lock(&all_mddevs_lock
);
3620 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
3621 if (mddev2
->gendisk
&&
3622 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
3623 spin_unlock(&all_mddevs_lock
);
3626 spin_unlock(&all_mddevs_lock
);
3629 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
3630 if (!mddev
->queue
) {
3631 mutex_unlock(&disks_mutex
);
3635 /* Can be unlocked because the queue is new: no concurrency */
3636 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
3638 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3640 disk
= alloc_disk(1 << shift
);
3642 mutex_unlock(&disks_mutex
);
3643 blk_cleanup_queue(mddev
->queue
);
3644 mddev
->queue
= NULL
;
3648 disk
->major
= MAJOR(mddev
->unit
);
3649 disk
->first_minor
= unit
<< shift
;
3651 strcpy(disk
->disk_name
, name
);
3652 else if (partitioned
)
3653 sprintf(disk
->disk_name
, "md_d%d", unit
);
3655 sprintf(disk
->disk_name
, "md%d", unit
);
3656 disk
->fops
= &md_fops
;
3657 disk
->private_data
= mddev
;
3658 disk
->queue
= mddev
->queue
;
3659 /* Allow extended partitions. This makes the
3660 * 'mdp' device redundant, but we can't really
3663 disk
->flags
|= GENHD_FL_EXT_DEVT
;
3665 mddev
->gendisk
= disk
;
3666 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3667 &disk_to_dev(disk
)->kobj
, "%s", "md");
3668 mutex_unlock(&disks_mutex
);
3670 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3673 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3674 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
3680 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3682 md_alloc(dev
, NULL
);
3686 static int add_named_array(const char *val
, struct kernel_param
*kp
)
3688 /* val must be "md_*" where * is not all digits.
3689 * We allocate an array with a large free minor number, and
3690 * set the name to val. val must not already be an active name.
3692 int len
= strlen(val
);
3693 char buf
[DISK_NAME_LEN
];
3695 while (len
&& val
[len
-1] == '\n')
3697 if (len
>= DISK_NAME_LEN
)
3699 strlcpy(buf
, val
, len
+1);
3700 if (strncmp(buf
, "md_", 3) != 0)
3702 return md_alloc(0, buf
);
3705 static void md_safemode_timeout(unsigned long data
)
3707 mddev_t
*mddev
= (mddev_t
*) data
;
3709 if (!atomic_read(&mddev
->writes_pending
)) {
3710 mddev
->safemode
= 1;
3711 if (mddev
->external
)
3712 sysfs_notify_dirent(mddev
->sysfs_state
);
3714 md_wakeup_thread(mddev
->thread
);
3717 static int start_dirty_degraded
;
3719 static int do_md_run(mddev_t
* mddev
)
3724 struct gendisk
*disk
;
3725 struct mdk_personality
*pers
;
3726 char b
[BDEVNAME_SIZE
];
3728 if (list_empty(&mddev
->disks
))
3729 /* cannot run an array with no devices.. */
3736 * Analyze all RAID superblock(s)
3738 if (!mddev
->raid_disks
) {
3739 if (!mddev
->persistent
)
3744 chunk_size
= mddev
->chunk_size
;
3747 if (chunk_size
> MAX_CHUNK_SIZE
) {
3748 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3749 chunk_size
, MAX_CHUNK_SIZE
);
3753 * chunk-size has to be a power of 2
3755 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3756 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3760 /* devices must have minimum size of one chunk */
3761 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3762 if (test_bit(Faulty
, &rdev
->flags
))
3764 if (rdev
->sectors
< chunk_size
/ 512) {
3766 "md: Dev %s smaller than chunk_size:"
3768 bdevname(rdev
->bdev
,b
),
3769 (unsigned long long)rdev
->sectors
,
3776 if (mddev
->level
!= LEVEL_NONE
)
3777 request_module("md-level-%d", mddev
->level
);
3778 else if (mddev
->clevel
[0])
3779 request_module("md-%s", mddev
->clevel
);
3782 * Drop all container device buffers, from now on
3783 * the only valid external interface is through the md
3786 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3787 if (test_bit(Faulty
, &rdev
->flags
))
3789 sync_blockdev(rdev
->bdev
);
3790 invalidate_bdev(rdev
->bdev
);
3792 /* perform some consistency tests on the device.
3793 * We don't want the data to overlap the metadata,
3794 * Internal Bitmap issues have been handled elsewhere.
3796 if (rdev
->data_offset
< rdev
->sb_start
) {
3797 if (mddev
->dev_sectors
&&
3798 rdev
->data_offset
+ mddev
->dev_sectors
3800 printk("md: %s: data overlaps metadata\n",
3805 if (rdev
->sb_start
+ rdev
->sb_size
/512
3806 > rdev
->data_offset
) {
3807 printk("md: %s: metadata overlaps data\n",
3812 sysfs_notify_dirent(rdev
->sysfs_state
);
3815 md_probe(mddev
->unit
, NULL
, NULL
);
3816 disk
= mddev
->gendisk
;
3820 spin_lock(&pers_lock
);
3821 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3822 if (!pers
|| !try_module_get(pers
->owner
)) {
3823 spin_unlock(&pers_lock
);
3824 if (mddev
->level
!= LEVEL_NONE
)
3825 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3828 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3833 spin_unlock(&pers_lock
);
3834 if (mddev
->level
!= pers
->level
) {
3835 mddev
->level
= pers
->level
;
3836 mddev
->new_level
= pers
->level
;
3838 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3840 if (pers
->level
>= 4 && pers
->level
<= 6)
3841 /* Cannot support integrity (yet) */
3842 blk_integrity_unregister(mddev
->gendisk
);
3844 if (mddev
->reshape_position
!= MaxSector
&&
3845 pers
->start_reshape
== NULL
) {
3846 /* This personality cannot handle reshaping... */
3848 module_put(pers
->owner
);
3852 if (pers
->sync_request
) {
3853 /* Warn if this is a potentially silly
3856 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3860 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3861 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
3863 rdev
->bdev
->bd_contains
==
3864 rdev2
->bdev
->bd_contains
) {
3866 "%s: WARNING: %s appears to be"
3867 " on the same physical disk as"
3870 bdevname(rdev
->bdev
,b
),
3871 bdevname(rdev2
->bdev
,b2
));
3878 "True protection against single-disk"
3879 " failure might be compromised.\n");
3882 mddev
->recovery
= 0;
3883 /* may be over-ridden by personality */
3884 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
3886 mddev
->barriers_work
= 1;
3887 mddev
->ok_start_degraded
= start_dirty_degraded
;
3890 mddev
->ro
= 2; /* read-only, but switch on first write */
3892 err
= mddev
->pers
->run(mddev
);
3894 printk(KERN_ERR
"md: pers->run() failed ...\n");
3895 else if (mddev
->pers
->sync_request
) {
3896 err
= bitmap_create(mddev
);
3898 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3899 mdname(mddev
), err
);
3900 mddev
->pers
->stop(mddev
);
3904 module_put(mddev
->pers
->owner
);
3906 bitmap_destroy(mddev
);
3909 if (mddev
->pers
->sync_request
) {
3910 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3912 "md: cannot register extra attributes for %s\n",
3914 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3915 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3918 atomic_set(&mddev
->writes_pending
,0);
3919 mddev
->safemode
= 0;
3920 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3921 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3922 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3925 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3926 if (rdev
->raid_disk
>= 0) {
3928 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3929 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3930 printk("md: cannot register %s for %s\n",
3934 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3937 md_update_sb(mddev
, 0);
3939 set_capacity(disk
, mddev
->array_sectors
);
3941 /* If we call blk_queue_make_request here, it will
3942 * re-initialise max_sectors etc which may have been
3943 * refined inside -> run. So just set the bits we need to set.
3944 * Most initialisation happended when we called
3945 * blk_queue_make_request(..., md_fail_request)
3948 mddev
->queue
->queuedata
= mddev
;
3949 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3951 /* If there is a partially-recovered drive we need to
3952 * start recovery here. If we leave it to md_check_recovery,
3953 * it will remove the drives and not do the right thing
3955 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3957 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3958 if (rdev
->raid_disk
>= 0 &&
3959 !test_bit(In_sync
, &rdev
->flags
) &&
3960 !test_bit(Faulty
, &rdev
->flags
))
3961 /* complete an interrupted recovery */
3963 if (spares
&& mddev
->pers
->sync_request
) {
3964 mddev
->recovery
= 0;
3965 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3966 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3969 if (!mddev
->sync_thread
) {
3970 printk(KERN_ERR
"%s: could not start resync"
3973 /* leave the spares where they are, it shouldn't hurt */
3974 mddev
->recovery
= 0;
3978 md_wakeup_thread(mddev
->thread
);
3979 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3982 md_new_event(mddev
);
3983 sysfs_notify_dirent(mddev
->sysfs_state
);
3984 if (mddev
->sysfs_action
)
3985 sysfs_notify_dirent(mddev
->sysfs_action
);
3986 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3987 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
3991 static int restart_array(mddev_t
*mddev
)
3993 struct gendisk
*disk
= mddev
->gendisk
;
3995 /* Complain if it has no devices */
3996 if (list_empty(&mddev
->disks
))
4002 mddev
->safemode
= 0;
4004 set_disk_ro(disk
, 0);
4005 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4007 /* Kick recovery or resync if necessary */
4008 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4009 md_wakeup_thread(mddev
->thread
);
4010 md_wakeup_thread(mddev
->sync_thread
);
4011 sysfs_notify_dirent(mddev
->sysfs_state
);
4015 /* similar to deny_write_access, but accounts for our holding a reference
4016 * to the file ourselves */
4017 static int deny_bitmap_write_access(struct file
* file
)
4019 struct inode
*inode
= file
->f_mapping
->host
;
4021 spin_lock(&inode
->i_lock
);
4022 if (atomic_read(&inode
->i_writecount
) > 1) {
4023 spin_unlock(&inode
->i_lock
);
4026 atomic_set(&inode
->i_writecount
, -1);
4027 spin_unlock(&inode
->i_lock
);
4032 static void restore_bitmap_write_access(struct file
*file
)
4034 struct inode
*inode
= file
->f_mapping
->host
;
4036 spin_lock(&inode
->i_lock
);
4037 atomic_set(&inode
->i_writecount
, 1);
4038 spin_unlock(&inode
->i_lock
);
4042 * 0 - completely stop and dis-assemble array
4043 * 1 - switch to readonly
4044 * 2 - stop but do not disassemble array
4046 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4049 struct gendisk
*disk
= mddev
->gendisk
;
4051 if (atomic_read(&mddev
->openers
) > is_open
) {
4052 printk("md: %s still in use.\n",mdname(mddev
));
4058 if (mddev
->sync_thread
) {
4059 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4060 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4061 md_unregister_thread(mddev
->sync_thread
);
4062 mddev
->sync_thread
= NULL
;
4065 del_timer_sync(&mddev
->safemode_timer
);
4068 case 1: /* readonly */
4074 case 0: /* disassemble */
4076 bitmap_flush(mddev
);
4077 md_super_wait(mddev
);
4079 set_disk_ro(disk
, 0);
4080 blk_queue_make_request(mddev
->queue
, md_fail_request
);
4081 mddev
->pers
->stop(mddev
);
4082 mddev
->queue
->merge_bvec_fn
= NULL
;
4083 mddev
->queue
->unplug_fn
= NULL
;
4084 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4085 if (mddev
->pers
->sync_request
) {
4086 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
4087 if (mddev
->sysfs_action
)
4088 sysfs_put(mddev
->sysfs_action
);
4089 mddev
->sysfs_action
= NULL
;
4091 module_put(mddev
->pers
->owner
);
4093 /* tell userspace to handle 'inactive' */
4094 sysfs_notify_dirent(mddev
->sysfs_state
);
4096 set_capacity(disk
, 0);
4102 if (!mddev
->in_sync
|| mddev
->flags
) {
4103 /* mark array as shutdown cleanly */
4105 md_update_sb(mddev
, 1);
4108 set_disk_ro(disk
, 1);
4109 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4113 * Free resources if final stop
4118 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4120 bitmap_destroy(mddev
);
4121 if (mddev
->bitmap_file
) {
4122 restore_bitmap_write_access(mddev
->bitmap_file
);
4123 fput(mddev
->bitmap_file
);
4124 mddev
->bitmap_file
= NULL
;
4126 mddev
->bitmap_offset
= 0;
4128 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4129 if (rdev
->raid_disk
>= 0) {
4131 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4132 sysfs_remove_link(&mddev
->kobj
, nm
);
4135 /* make sure all md_delayed_delete calls have finished */
4136 flush_scheduled_work();
4138 export_array(mddev
);
4140 mddev
->array_sectors
= 0;
4141 mddev
->dev_sectors
= 0;
4142 mddev
->raid_disks
= 0;
4143 mddev
->recovery_cp
= 0;
4144 mddev
->resync_min
= 0;
4145 mddev
->resync_max
= MaxSector
;
4146 mddev
->reshape_position
= MaxSector
;
4147 mddev
->external
= 0;
4148 mddev
->persistent
= 0;
4149 mddev
->level
= LEVEL_NONE
;
4150 mddev
->clevel
[0] = 0;
4153 mddev
->metadata_type
[0] = 0;
4154 mddev
->chunk_size
= 0;
4155 mddev
->ctime
= mddev
->utime
= 0;
4157 mddev
->max_disks
= 0;
4159 mddev
->delta_disks
= 0;
4160 mddev
->new_level
= LEVEL_NONE
;
4161 mddev
->new_layout
= 0;
4162 mddev
->new_chunk
= 0;
4163 mddev
->curr_resync
= 0;
4164 mddev
->resync_mismatches
= 0;
4165 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4166 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4167 mddev
->recovery
= 0;
4170 mddev
->degraded
= 0;
4171 mddev
->barriers_work
= 0;
4172 mddev
->safemode
= 0;
4173 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4174 if (mddev
->hold_active
== UNTIL_STOP
)
4175 mddev
->hold_active
= 0;
4177 } else if (mddev
->pers
)
4178 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
4181 blk_integrity_unregister(disk
);
4182 md_new_event(mddev
);
4183 sysfs_notify_dirent(mddev
->sysfs_state
);
4189 static void autorun_array(mddev_t
*mddev
)
4194 if (list_empty(&mddev
->disks
))
4197 printk(KERN_INFO
"md: running: ");
4199 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4200 char b
[BDEVNAME_SIZE
];
4201 printk("<%s>", bdevname(rdev
->bdev
,b
));
4205 err
= do_md_run(mddev
);
4207 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4208 do_md_stop(mddev
, 0, 0);
4213 * lets try to run arrays based on all disks that have arrived
4214 * until now. (those are in pending_raid_disks)
4216 * the method: pick the first pending disk, collect all disks with
4217 * the same UUID, remove all from the pending list and put them into
4218 * the 'same_array' list. Then order this list based on superblock
4219 * update time (freshest comes first), kick out 'old' disks and
4220 * compare superblocks. If everything's fine then run it.
4222 * If "unit" is allocated, then bump its reference count
4224 static void autorun_devices(int part
)
4226 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4228 char b
[BDEVNAME_SIZE
];
4230 printk(KERN_INFO
"md: autorun ...\n");
4231 while (!list_empty(&pending_raid_disks
)) {
4234 LIST_HEAD(candidates
);
4235 rdev0
= list_entry(pending_raid_disks
.next
,
4236 mdk_rdev_t
, same_set
);
4238 printk(KERN_INFO
"md: considering %s ...\n",
4239 bdevname(rdev0
->bdev
,b
));
4240 INIT_LIST_HEAD(&candidates
);
4241 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4242 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4243 printk(KERN_INFO
"md: adding %s ...\n",
4244 bdevname(rdev
->bdev
,b
));
4245 list_move(&rdev
->same_set
, &candidates
);
4248 * now we have a set of devices, with all of them having
4249 * mostly sane superblocks. It's time to allocate the
4253 dev
= MKDEV(mdp_major
,
4254 rdev0
->preferred_minor
<< MdpMinorShift
);
4255 unit
= MINOR(dev
) >> MdpMinorShift
;
4257 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4260 if (rdev0
->preferred_minor
!= unit
) {
4261 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4262 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4266 md_probe(dev
, NULL
, NULL
);
4267 mddev
= mddev_find(dev
);
4268 if (!mddev
|| !mddev
->gendisk
) {
4272 "md: cannot allocate memory for md drive.\n");
4275 if (mddev_lock(mddev
))
4276 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4278 else if (mddev
->raid_disks
|| mddev
->major_version
4279 || !list_empty(&mddev
->disks
)) {
4281 "md: %s already running, cannot run %s\n",
4282 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4283 mddev_unlock(mddev
);
4285 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4286 mddev
->persistent
= 1;
4287 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4288 list_del_init(&rdev
->same_set
);
4289 if (bind_rdev_to_array(rdev
, mddev
))
4292 autorun_array(mddev
);
4293 mddev_unlock(mddev
);
4295 /* on success, candidates will be empty, on error
4298 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4299 list_del_init(&rdev
->same_set
);
4304 printk(KERN_INFO
"md: ... autorun DONE.\n");
4306 #endif /* !MODULE */
4308 static int get_version(void __user
* arg
)
4312 ver
.major
= MD_MAJOR_VERSION
;
4313 ver
.minor
= MD_MINOR_VERSION
;
4314 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4316 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4322 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4324 mdu_array_info_t info
;
4325 int nr
,working
,active
,failed
,spare
;
4328 nr
=working
=active
=failed
=spare
=0;
4329 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4331 if (test_bit(Faulty
, &rdev
->flags
))
4335 if (test_bit(In_sync
, &rdev
->flags
))
4342 info
.major_version
= mddev
->major_version
;
4343 info
.minor_version
= mddev
->minor_version
;
4344 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4345 info
.ctime
= mddev
->ctime
;
4346 info
.level
= mddev
->level
;
4347 info
.size
= mddev
->dev_sectors
/ 2;
4348 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4351 info
.raid_disks
= mddev
->raid_disks
;
4352 info
.md_minor
= mddev
->md_minor
;
4353 info
.not_persistent
= !mddev
->persistent
;
4355 info
.utime
= mddev
->utime
;
4358 info
.state
= (1<<MD_SB_CLEAN
);
4359 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4360 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4361 info
.active_disks
= active
;
4362 info
.working_disks
= working
;
4363 info
.failed_disks
= failed
;
4364 info
.spare_disks
= spare
;
4366 info
.layout
= mddev
->layout
;
4367 info
.chunk_size
= mddev
->chunk_size
;
4369 if (copy_to_user(arg
, &info
, sizeof(info
)))
4375 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4377 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4378 char *ptr
, *buf
= NULL
;
4381 if (md_allow_write(mddev
))
4382 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4384 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4389 /* bitmap disabled, zero the first byte and copy out */
4390 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4391 file
->pathname
[0] = '\0';
4395 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4399 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4403 strcpy(file
->pathname
, ptr
);
4407 if (copy_to_user(arg
, file
, sizeof(*file
)))
4415 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4417 mdu_disk_info_t info
;
4420 if (copy_from_user(&info
, arg
, sizeof(info
)))
4423 rdev
= find_rdev_nr(mddev
, info
.number
);
4425 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4426 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4427 info
.raid_disk
= rdev
->raid_disk
;
4429 if (test_bit(Faulty
, &rdev
->flags
))
4430 info
.state
|= (1<<MD_DISK_FAULTY
);
4431 else if (test_bit(In_sync
, &rdev
->flags
)) {
4432 info
.state
|= (1<<MD_DISK_ACTIVE
);
4433 info
.state
|= (1<<MD_DISK_SYNC
);
4435 if (test_bit(WriteMostly
, &rdev
->flags
))
4436 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4438 info
.major
= info
.minor
= 0;
4439 info
.raid_disk
= -1;
4440 info
.state
= (1<<MD_DISK_REMOVED
);
4443 if (copy_to_user(arg
, &info
, sizeof(info
)))
4449 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4451 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4453 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4455 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4458 if (!mddev
->raid_disks
) {
4460 /* expecting a device which has a superblock */
4461 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4464 "md: md_import_device returned %ld\n",
4466 return PTR_ERR(rdev
);
4468 if (!list_empty(&mddev
->disks
)) {
4469 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4470 mdk_rdev_t
, same_set
);
4471 int err
= super_types
[mddev
->major_version
]
4472 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4475 "md: %s has different UUID to %s\n",
4476 bdevname(rdev
->bdev
,b
),
4477 bdevname(rdev0
->bdev
,b2
));
4482 err
= bind_rdev_to_array(rdev
, mddev
);
4489 * add_new_disk can be used once the array is assembled
4490 * to add "hot spares". They must already have a superblock
4495 if (!mddev
->pers
->hot_add_disk
) {
4497 "%s: personality does not support diskops!\n",
4501 if (mddev
->persistent
)
4502 rdev
= md_import_device(dev
, mddev
->major_version
,
4503 mddev
->minor_version
);
4505 rdev
= md_import_device(dev
, -1, -1);
4508 "md: md_import_device returned %ld\n",
4510 return PTR_ERR(rdev
);
4512 /* set save_raid_disk if appropriate */
4513 if (!mddev
->persistent
) {
4514 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4515 info
->raid_disk
< mddev
->raid_disks
)
4516 rdev
->raid_disk
= info
->raid_disk
;
4518 rdev
->raid_disk
= -1;
4520 super_types
[mddev
->major_version
].
4521 validate_super(mddev
, rdev
);
4522 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4524 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4525 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4526 set_bit(WriteMostly
, &rdev
->flags
);
4528 clear_bit(WriteMostly
, &rdev
->flags
);
4530 rdev
->raid_disk
= -1;
4531 err
= bind_rdev_to_array(rdev
, mddev
);
4532 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4533 /* If there is hot_add_disk but no hot_remove_disk
4534 * then added disks for geometry changes,
4535 * and should be added immediately.
4537 super_types
[mddev
->major_version
].
4538 validate_super(mddev
, rdev
);
4539 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4541 unbind_rdev_from_array(rdev
);
4546 sysfs_notify_dirent(rdev
->sysfs_state
);
4548 md_update_sb(mddev
, 1);
4549 if (mddev
->degraded
)
4550 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4551 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4552 md_wakeup_thread(mddev
->thread
);
4556 /* otherwise, add_new_disk is only allowed
4557 * for major_version==0 superblocks
4559 if (mddev
->major_version
!= 0) {
4560 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4565 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4567 rdev
= md_import_device(dev
, -1, 0);
4570 "md: error, md_import_device() returned %ld\n",
4572 return PTR_ERR(rdev
);
4574 rdev
->desc_nr
= info
->number
;
4575 if (info
->raid_disk
< mddev
->raid_disks
)
4576 rdev
->raid_disk
= info
->raid_disk
;
4578 rdev
->raid_disk
= -1;
4580 if (rdev
->raid_disk
< mddev
->raid_disks
)
4581 if (info
->state
& (1<<MD_DISK_SYNC
))
4582 set_bit(In_sync
, &rdev
->flags
);
4584 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4585 set_bit(WriteMostly
, &rdev
->flags
);
4587 if (!mddev
->persistent
) {
4588 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4589 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4591 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4592 rdev
->sectors
= calc_num_sectors(rdev
, mddev
->chunk_size
);
4594 err
= bind_rdev_to_array(rdev
, mddev
);
4604 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4606 char b
[BDEVNAME_SIZE
];
4609 rdev
= find_rdev(mddev
, dev
);
4613 if (rdev
->raid_disk
>= 0)
4616 kick_rdev_from_array(rdev
);
4617 md_update_sb(mddev
, 1);
4618 md_new_event(mddev
);
4622 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4623 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4627 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4629 char b
[BDEVNAME_SIZE
];
4636 if (mddev
->major_version
!= 0) {
4637 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4638 " version-0 superblocks.\n",
4642 if (!mddev
->pers
->hot_add_disk
) {
4644 "%s: personality does not support diskops!\n",
4649 rdev
= md_import_device(dev
, -1, 0);
4652 "md: error, md_import_device() returned %ld\n",
4657 if (mddev
->persistent
)
4658 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4660 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4662 rdev
->sectors
= calc_num_sectors(rdev
, mddev
->chunk_size
);
4664 if (test_bit(Faulty
, &rdev
->flags
)) {
4666 "md: can not hot-add faulty %s disk to %s!\n",
4667 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4671 clear_bit(In_sync
, &rdev
->flags
);
4673 rdev
->saved_raid_disk
= -1;
4674 err
= bind_rdev_to_array(rdev
, mddev
);
4679 * The rest should better be atomic, we can have disk failures
4680 * noticed in interrupt contexts ...
4683 rdev
->raid_disk
= -1;
4685 md_update_sb(mddev
, 1);
4688 * Kick recovery, maybe this spare has to be added to the
4689 * array immediately.
4691 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4692 md_wakeup_thread(mddev
->thread
);
4693 md_new_event(mddev
);
4701 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4706 if (!mddev
->pers
->quiesce
)
4708 if (mddev
->recovery
|| mddev
->sync_thread
)
4710 /* we should be able to change the bitmap.. */
4716 return -EEXIST
; /* cannot add when bitmap is present */
4717 mddev
->bitmap_file
= fget(fd
);
4719 if (mddev
->bitmap_file
== NULL
) {
4720 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4725 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4727 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4729 fput(mddev
->bitmap_file
);
4730 mddev
->bitmap_file
= NULL
;
4733 mddev
->bitmap_offset
= 0; /* file overrides offset */
4734 } else if (mddev
->bitmap
== NULL
)
4735 return -ENOENT
; /* cannot remove what isn't there */
4738 mddev
->pers
->quiesce(mddev
, 1);
4740 err
= bitmap_create(mddev
);
4741 if (fd
< 0 || err
) {
4742 bitmap_destroy(mddev
);
4743 fd
= -1; /* make sure to put the file */
4745 mddev
->pers
->quiesce(mddev
, 0);
4748 if (mddev
->bitmap_file
) {
4749 restore_bitmap_write_access(mddev
->bitmap_file
);
4750 fput(mddev
->bitmap_file
);
4752 mddev
->bitmap_file
= NULL
;
4759 * set_array_info is used two different ways
4760 * The original usage is when creating a new array.
4761 * In this usage, raid_disks is > 0 and it together with
4762 * level, size, not_persistent,layout,chunksize determine the
4763 * shape of the array.
4764 * This will always create an array with a type-0.90.0 superblock.
4765 * The newer usage is when assembling an array.
4766 * In this case raid_disks will be 0, and the major_version field is
4767 * use to determine which style super-blocks are to be found on the devices.
4768 * The minor and patch _version numbers are also kept incase the
4769 * super_block handler wishes to interpret them.
4771 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4774 if (info
->raid_disks
== 0) {
4775 /* just setting version number for superblock loading */
4776 if (info
->major_version
< 0 ||
4777 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4778 super_types
[info
->major_version
].name
== NULL
) {
4779 /* maybe try to auto-load a module? */
4781 "md: superblock version %d not known\n",
4782 info
->major_version
);
4785 mddev
->major_version
= info
->major_version
;
4786 mddev
->minor_version
= info
->minor_version
;
4787 mddev
->patch_version
= info
->patch_version
;
4788 mddev
->persistent
= !info
->not_persistent
;
4791 mddev
->major_version
= MD_MAJOR_VERSION
;
4792 mddev
->minor_version
= MD_MINOR_VERSION
;
4793 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4794 mddev
->ctime
= get_seconds();
4796 mddev
->level
= info
->level
;
4797 mddev
->clevel
[0] = 0;
4798 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
4799 mddev
->raid_disks
= info
->raid_disks
;
4800 /* don't set md_minor, it is determined by which /dev/md* was
4803 if (info
->state
& (1<<MD_SB_CLEAN
))
4804 mddev
->recovery_cp
= MaxSector
;
4806 mddev
->recovery_cp
= 0;
4807 mddev
->persistent
= ! info
->not_persistent
;
4808 mddev
->external
= 0;
4810 mddev
->layout
= info
->layout
;
4811 mddev
->chunk_size
= info
->chunk_size
;
4813 mddev
->max_disks
= MD_SB_DISKS
;
4815 if (mddev
->persistent
)
4817 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4819 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4820 mddev
->bitmap_offset
= 0;
4822 mddev
->reshape_position
= MaxSector
;
4825 * Generate a 128 bit UUID
4827 get_random_bytes(mddev
->uuid
, 16);
4829 mddev
->new_level
= mddev
->level
;
4830 mddev
->new_chunk
= mddev
->chunk_size
;
4831 mddev
->new_layout
= mddev
->layout
;
4832 mddev
->delta_disks
= 0;
4837 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
4841 int fit
= (num_sectors
== 0);
4843 if (mddev
->pers
->resize
== NULL
)
4845 /* The "num_sectors" is the number of sectors of each device that
4846 * is used. This can only make sense for arrays with redundancy.
4847 * linear and raid0 always use whatever space is available. We can only
4848 * consider changing this number if no resync or reconstruction is
4849 * happening, and if the new size is acceptable. It must fit before the
4850 * sb_start or, if that is <data_offset, it must fit before the size
4851 * of each device. If num_sectors is zero, we find the largest size
4855 if (mddev
->sync_thread
)
4858 /* Sorry, cannot grow a bitmap yet, just remove it,
4862 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4863 sector_t avail
= rdev
->sectors
;
4865 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
4866 num_sectors
= avail
;
4867 if (avail
< num_sectors
)
4870 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
4872 struct block_device
*bdev
;
4874 bdev
= bdget_disk(mddev
->gendisk
, 0);
4876 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4877 i_size_write(bdev
->bd_inode
,
4878 (loff_t
)mddev
->array_sectors
<< 9);
4879 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4886 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4889 /* change the number of raid disks */
4890 if (mddev
->pers
->check_reshape
== NULL
)
4892 if (raid_disks
<= 0 ||
4893 raid_disks
>= mddev
->max_disks
)
4895 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4897 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4899 rv
= mddev
->pers
->check_reshape(mddev
);
4905 * update_array_info is used to change the configuration of an
4907 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4908 * fields in the info are checked against the array.
4909 * Any differences that cannot be handled will cause an error.
4910 * Normally, only one change can be managed at a time.
4912 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4918 /* calculate expected state,ignoring low bits */
4919 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4920 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4922 if (mddev
->major_version
!= info
->major_version
||
4923 mddev
->minor_version
!= info
->minor_version
||
4924 /* mddev->patch_version != info->patch_version || */
4925 mddev
->ctime
!= info
->ctime
||
4926 mddev
->level
!= info
->level
||
4927 /* mddev->layout != info->layout || */
4928 !mddev
->persistent
!= info
->not_persistent
||
4929 mddev
->chunk_size
!= info
->chunk_size
||
4930 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4931 ((state
^info
->state
) & 0xfffffe00)
4934 /* Check there is only one change */
4935 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
4937 if (mddev
->raid_disks
!= info
->raid_disks
)
4939 if (mddev
->layout
!= info
->layout
)
4941 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
4948 if (mddev
->layout
!= info
->layout
) {
4950 * we don't need to do anything at the md level, the
4951 * personality will take care of it all.
4953 if (mddev
->pers
->reconfig
== NULL
)
4956 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4958 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
4959 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
4961 if (mddev
->raid_disks
!= info
->raid_disks
)
4962 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4964 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4965 if (mddev
->pers
->quiesce
== NULL
)
4967 if (mddev
->recovery
|| mddev
->sync_thread
)
4969 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4970 /* add the bitmap */
4973 if (mddev
->default_bitmap_offset
== 0)
4975 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4976 mddev
->pers
->quiesce(mddev
, 1);
4977 rv
= bitmap_create(mddev
);
4979 bitmap_destroy(mddev
);
4980 mddev
->pers
->quiesce(mddev
, 0);
4982 /* remove the bitmap */
4985 if (mddev
->bitmap
->file
)
4987 mddev
->pers
->quiesce(mddev
, 1);
4988 bitmap_destroy(mddev
);
4989 mddev
->pers
->quiesce(mddev
, 0);
4990 mddev
->bitmap_offset
= 0;
4993 md_update_sb(mddev
, 1);
4997 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5001 if (mddev
->pers
== NULL
)
5004 rdev
= find_rdev(mddev
, dev
);
5008 md_error(mddev
, rdev
);
5013 * We have a problem here : there is no easy way to give a CHS
5014 * virtual geometry. We currently pretend that we have a 2 heads
5015 * 4 sectors (with a BIG number of cylinders...). This drives
5016 * dosfs just mad... ;-)
5018 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5020 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5024 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
5028 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5029 unsigned int cmd
, unsigned long arg
)
5032 void __user
*argp
= (void __user
*)arg
;
5033 mddev_t
*mddev
= NULL
;
5035 if (!capable(CAP_SYS_ADMIN
))
5039 * Commands dealing with the RAID driver but not any
5045 err
= get_version(argp
);
5048 case PRINT_RAID_DEBUG
:
5056 autostart_arrays(arg
);
5063 * Commands creating/starting a new array:
5066 mddev
= bdev
->bd_disk
->private_data
;
5073 err
= mddev_lock(mddev
);
5076 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5083 case SET_ARRAY_INFO
:
5085 mdu_array_info_t info
;
5087 memset(&info
, 0, sizeof(info
));
5088 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5093 err
= update_array_info(mddev
, &info
);
5095 printk(KERN_WARNING
"md: couldn't update"
5096 " array info. %d\n", err
);
5101 if (!list_empty(&mddev
->disks
)) {
5103 "md: array %s already has disks!\n",
5108 if (mddev
->raid_disks
) {
5110 "md: array %s already initialised!\n",
5115 err
= set_array_info(mddev
, &info
);
5117 printk(KERN_WARNING
"md: couldn't set"
5118 " array info. %d\n", err
);
5128 * Commands querying/configuring an existing array:
5130 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5131 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5132 if ((!mddev
->raid_disks
&& !mddev
->external
)
5133 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5134 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5135 && cmd
!= GET_BITMAP_FILE
) {
5141 * Commands even a read-only array can execute:
5145 case GET_ARRAY_INFO
:
5146 err
= get_array_info(mddev
, argp
);
5149 case GET_BITMAP_FILE
:
5150 err
= get_bitmap_file(mddev
, argp
);
5154 err
= get_disk_info(mddev
, argp
);
5157 case RESTART_ARRAY_RW
:
5158 err
= restart_array(mddev
);
5162 err
= do_md_stop(mddev
, 0, 1);
5166 err
= do_md_stop(mddev
, 1, 1);
5172 * The remaining ioctls are changing the state of the
5173 * superblock, so we do not allow them on read-only arrays.
5174 * However non-MD ioctls (e.g. get-size) will still come through
5175 * here and hit the 'default' below, so only disallow
5176 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5178 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5179 if (mddev
->ro
== 2) {
5181 sysfs_notify_dirent(mddev
->sysfs_state
);
5182 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5183 md_wakeup_thread(mddev
->thread
);
5194 mdu_disk_info_t info
;
5195 if (copy_from_user(&info
, argp
, sizeof(info
)))
5198 err
= add_new_disk(mddev
, &info
);
5202 case HOT_REMOVE_DISK
:
5203 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5207 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5210 case SET_DISK_FAULTY
:
5211 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5215 err
= do_md_run(mddev
);
5218 case SET_BITMAP_FILE
:
5219 err
= set_bitmap_file(mddev
, (int)arg
);
5229 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5231 mddev
->hold_active
= 0;
5232 mddev_unlock(mddev
);
5242 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5245 * Succeed if we can lock the mddev, which confirms that
5246 * it isn't being stopped right now.
5248 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5251 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5252 /* we are racing with mddev_put which is discarding this
5256 /* Wait until bdev->bd_disk is definitely gone */
5257 flush_scheduled_work();
5258 /* Then retry the open from the top */
5259 return -ERESTARTSYS
;
5261 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5263 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5267 atomic_inc(&mddev
->openers
);
5268 mddev_unlock(mddev
);
5270 check_disk_change(bdev
);
5275 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5277 mddev_t
*mddev
= disk
->private_data
;
5280 atomic_dec(&mddev
->openers
);
5286 static int md_media_changed(struct gendisk
*disk
)
5288 mddev_t
*mddev
= disk
->private_data
;
5290 return mddev
->changed
;
5293 static int md_revalidate(struct gendisk
*disk
)
5295 mddev_t
*mddev
= disk
->private_data
;
5300 static struct block_device_operations md_fops
=
5302 .owner
= THIS_MODULE
,
5304 .release
= md_release
,
5305 .locked_ioctl
= md_ioctl
,
5306 .getgeo
= md_getgeo
,
5307 .media_changed
= md_media_changed
,
5308 .revalidate_disk
= md_revalidate
,
5311 static int md_thread(void * arg
)
5313 mdk_thread_t
*thread
= arg
;
5316 * md_thread is a 'system-thread', it's priority should be very
5317 * high. We avoid resource deadlocks individually in each
5318 * raid personality. (RAID5 does preallocation) We also use RR and
5319 * the very same RT priority as kswapd, thus we will never get
5320 * into a priority inversion deadlock.
5322 * we definitely have to have equal or higher priority than
5323 * bdflush, otherwise bdflush will deadlock if there are too
5324 * many dirty RAID5 blocks.
5327 allow_signal(SIGKILL
);
5328 while (!kthread_should_stop()) {
5330 /* We need to wait INTERRUPTIBLE so that
5331 * we don't add to the load-average.
5332 * That means we need to be sure no signals are
5335 if (signal_pending(current
))
5336 flush_signals(current
);
5338 wait_event_interruptible_timeout
5340 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5341 || kthread_should_stop(),
5344 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5346 thread
->run(thread
->mddev
);
5352 void md_wakeup_thread(mdk_thread_t
*thread
)
5355 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5356 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5357 wake_up(&thread
->wqueue
);
5361 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5364 mdk_thread_t
*thread
;
5366 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5370 init_waitqueue_head(&thread
->wqueue
);
5373 thread
->mddev
= mddev
;
5374 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5375 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5376 if (IS_ERR(thread
->tsk
)) {
5383 void md_unregister_thread(mdk_thread_t
*thread
)
5385 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5387 kthread_stop(thread
->tsk
);
5391 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5398 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5401 if (mddev
->external
)
5402 set_bit(Blocked
, &rdev
->flags
);
5404 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5406 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5407 __builtin_return_address(0),__builtin_return_address(1),
5408 __builtin_return_address(2),__builtin_return_address(3));
5412 if (!mddev
->pers
->error_handler
)
5414 mddev
->pers
->error_handler(mddev
,rdev
);
5415 if (mddev
->degraded
)
5416 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5417 set_bit(StateChanged
, &rdev
->flags
);
5418 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5419 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5420 md_wakeup_thread(mddev
->thread
);
5421 md_new_event_inintr(mddev
);
5424 /* seq_file implementation /proc/mdstat */
5426 static void status_unused(struct seq_file
*seq
)
5431 seq_printf(seq
, "unused devices: ");
5433 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5434 char b
[BDEVNAME_SIZE
];
5436 seq_printf(seq
, "%s ",
5437 bdevname(rdev
->bdev
,b
));
5440 seq_printf(seq
, "<none>");
5442 seq_printf(seq
, "\n");
5446 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5448 sector_t max_blocks
, resync
, res
;
5449 unsigned long dt
, db
, rt
;
5451 unsigned int per_milli
;
5453 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5455 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5456 max_blocks
= mddev
->resync_max_sectors
>> 1;
5458 max_blocks
= mddev
->dev_sectors
/ 2;
5461 * Should not happen.
5467 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5468 * in a sector_t, and (max_blocks>>scale) will fit in a
5469 * u32, as those are the requirements for sector_div.
5470 * Thus 'scale' must be at least 10
5473 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5474 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5477 res
= (resync
>>scale
)*1000;
5478 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5482 int i
, x
= per_milli
/50, y
= 20-x
;
5483 seq_printf(seq
, "[");
5484 for (i
= 0; i
< x
; i
++)
5485 seq_printf(seq
, "=");
5486 seq_printf(seq
, ">");
5487 for (i
= 0; i
< y
; i
++)
5488 seq_printf(seq
, ".");
5489 seq_printf(seq
, "] ");
5491 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5492 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5494 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5496 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5497 "resync" : "recovery"))),
5498 per_milli
/10, per_milli
% 10,
5499 (unsigned long long) resync
,
5500 (unsigned long long) max_blocks
);
5503 * We do not want to overflow, so the order of operands and
5504 * the * 100 / 100 trick are important. We do a +1 to be
5505 * safe against division by zero. We only estimate anyway.
5507 * dt: time from mark until now
5508 * db: blocks written from mark until now
5509 * rt: remaining time
5511 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5513 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5514 - mddev
->resync_mark_cnt
;
5515 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5517 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5519 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5522 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5524 struct list_head
*tmp
;
5534 spin_lock(&all_mddevs_lock
);
5535 list_for_each(tmp
,&all_mddevs
)
5537 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5539 spin_unlock(&all_mddevs_lock
);
5542 spin_unlock(&all_mddevs_lock
);
5544 return (void*)2;/* tail */
5548 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5550 struct list_head
*tmp
;
5551 mddev_t
*next_mddev
, *mddev
= v
;
5557 spin_lock(&all_mddevs_lock
);
5559 tmp
= all_mddevs
.next
;
5561 tmp
= mddev
->all_mddevs
.next
;
5562 if (tmp
!= &all_mddevs
)
5563 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5565 next_mddev
= (void*)2;
5568 spin_unlock(&all_mddevs_lock
);
5576 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5580 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5584 struct mdstat_info
{
5588 static int md_seq_show(struct seq_file
*seq
, void *v
)
5593 struct mdstat_info
*mi
= seq
->private;
5594 struct bitmap
*bitmap
;
5596 if (v
== (void*)1) {
5597 struct mdk_personality
*pers
;
5598 seq_printf(seq
, "Personalities : ");
5599 spin_lock(&pers_lock
);
5600 list_for_each_entry(pers
, &pers_list
, list
)
5601 seq_printf(seq
, "[%s] ", pers
->name
);
5603 spin_unlock(&pers_lock
);
5604 seq_printf(seq
, "\n");
5605 mi
->event
= atomic_read(&md_event_count
);
5608 if (v
== (void*)2) {
5613 if (mddev_lock(mddev
) < 0)
5616 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5617 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5618 mddev
->pers
? "" : "in");
5621 seq_printf(seq
, " (read-only)");
5623 seq_printf(seq
, " (auto-read-only)");
5624 seq_printf(seq
, " %s", mddev
->pers
->name
);
5628 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5629 char b
[BDEVNAME_SIZE
];
5630 seq_printf(seq
, " %s[%d]",
5631 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5632 if (test_bit(WriteMostly
, &rdev
->flags
))
5633 seq_printf(seq
, "(W)");
5634 if (test_bit(Faulty
, &rdev
->flags
)) {
5635 seq_printf(seq
, "(F)");
5637 } else if (rdev
->raid_disk
< 0)
5638 seq_printf(seq
, "(S)"); /* spare */
5639 sectors
+= rdev
->sectors
;
5642 if (!list_empty(&mddev
->disks
)) {
5644 seq_printf(seq
, "\n %llu blocks",
5645 (unsigned long long)
5646 mddev
->array_sectors
/ 2);
5648 seq_printf(seq
, "\n %llu blocks",
5649 (unsigned long long)sectors
/ 2);
5651 if (mddev
->persistent
) {
5652 if (mddev
->major_version
!= 0 ||
5653 mddev
->minor_version
!= 90) {
5654 seq_printf(seq
," super %d.%d",
5655 mddev
->major_version
,
5656 mddev
->minor_version
);
5658 } else if (mddev
->external
)
5659 seq_printf(seq
, " super external:%s",
5660 mddev
->metadata_type
);
5662 seq_printf(seq
, " super non-persistent");
5665 mddev
->pers
->status(seq
, mddev
);
5666 seq_printf(seq
, "\n ");
5667 if (mddev
->pers
->sync_request
) {
5668 if (mddev
->curr_resync
> 2) {
5669 status_resync(seq
, mddev
);
5670 seq_printf(seq
, "\n ");
5671 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5672 seq_printf(seq
, "\tresync=DELAYED\n ");
5673 else if (mddev
->recovery_cp
< MaxSector
)
5674 seq_printf(seq
, "\tresync=PENDING\n ");
5677 seq_printf(seq
, "\n ");
5679 if ((bitmap
= mddev
->bitmap
)) {
5680 unsigned long chunk_kb
;
5681 unsigned long flags
;
5682 spin_lock_irqsave(&bitmap
->lock
, flags
);
5683 chunk_kb
= bitmap
->chunksize
>> 10;
5684 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5686 bitmap
->pages
- bitmap
->missing_pages
,
5688 (bitmap
->pages
- bitmap
->missing_pages
)
5689 << (PAGE_SHIFT
- 10),
5690 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5691 chunk_kb
? "KB" : "B");
5693 seq_printf(seq
, ", file: ");
5694 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5697 seq_printf(seq
, "\n");
5698 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5701 seq_printf(seq
, "\n");
5703 mddev_unlock(mddev
);
5708 static struct seq_operations md_seq_ops
= {
5709 .start
= md_seq_start
,
5710 .next
= md_seq_next
,
5711 .stop
= md_seq_stop
,
5712 .show
= md_seq_show
,
5715 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5718 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5722 error
= seq_open(file
, &md_seq_ops
);
5726 struct seq_file
*p
= file
->private_data
;
5728 mi
->event
= atomic_read(&md_event_count
);
5733 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5735 struct seq_file
*m
= filp
->private_data
;
5736 struct mdstat_info
*mi
= m
->private;
5739 poll_wait(filp
, &md_event_waiters
, wait
);
5741 /* always allow read */
5742 mask
= POLLIN
| POLLRDNORM
;
5744 if (mi
->event
!= atomic_read(&md_event_count
))
5745 mask
|= POLLERR
| POLLPRI
;
5749 static const struct file_operations md_seq_fops
= {
5750 .owner
= THIS_MODULE
,
5751 .open
= md_seq_open
,
5753 .llseek
= seq_lseek
,
5754 .release
= seq_release_private
,
5755 .poll
= mdstat_poll
,
5758 int register_md_personality(struct mdk_personality
*p
)
5760 spin_lock(&pers_lock
);
5761 list_add_tail(&p
->list
, &pers_list
);
5762 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5763 spin_unlock(&pers_lock
);
5767 int unregister_md_personality(struct mdk_personality
*p
)
5769 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5770 spin_lock(&pers_lock
);
5771 list_del_init(&p
->list
);
5772 spin_unlock(&pers_lock
);
5776 static int is_mddev_idle(mddev_t
*mddev
, int init
)
5784 rdev_for_each_rcu(rdev
, mddev
) {
5785 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5786 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
5787 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
5788 atomic_read(&disk
->sync_io
);
5789 /* sync IO will cause sync_io to increase before the disk_stats
5790 * as sync_io is counted when a request starts, and
5791 * disk_stats is counted when it completes.
5792 * So resync activity will cause curr_events to be smaller than
5793 * when there was no such activity.
5794 * non-sync IO will cause disk_stat to increase without
5795 * increasing sync_io so curr_events will (eventually)
5796 * be larger than it was before. Once it becomes
5797 * substantially larger, the test below will cause
5798 * the array to appear non-idle, and resync will slow
5800 * If there is a lot of outstanding resync activity when
5801 * we set last_event to curr_events, then all that activity
5802 * completing might cause the array to appear non-idle
5803 * and resync will be slowed down even though there might
5804 * not have been non-resync activity. This will only
5805 * happen once though. 'last_events' will soon reflect
5806 * the state where there is little or no outstanding
5807 * resync requests, and further resync activity will
5808 * always make curr_events less than last_events.
5811 if (init
|| curr_events
- rdev
->last_events
> 64) {
5812 rdev
->last_events
= curr_events
;
5820 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5822 /* another "blocks" (512byte) blocks have been synced */
5823 atomic_sub(blocks
, &mddev
->recovery_active
);
5824 wake_up(&mddev
->recovery_wait
);
5826 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5827 md_wakeup_thread(mddev
->thread
);
5828 // stop recovery, signal do_sync ....
5833 /* md_write_start(mddev, bi)
5834 * If we need to update some array metadata (e.g. 'active' flag
5835 * in superblock) before writing, schedule a superblock update
5836 * and wait for it to complete.
5838 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5841 if (bio_data_dir(bi
) != WRITE
)
5844 BUG_ON(mddev
->ro
== 1);
5845 if (mddev
->ro
== 2) {
5846 /* need to switch to read/write */
5848 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5849 md_wakeup_thread(mddev
->thread
);
5850 md_wakeup_thread(mddev
->sync_thread
);
5853 atomic_inc(&mddev
->writes_pending
);
5854 if (mddev
->safemode
== 1)
5855 mddev
->safemode
= 0;
5856 if (mddev
->in_sync
) {
5857 spin_lock_irq(&mddev
->write_lock
);
5858 if (mddev
->in_sync
) {
5860 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5861 md_wakeup_thread(mddev
->thread
);
5864 spin_unlock_irq(&mddev
->write_lock
);
5867 sysfs_notify_dirent(mddev
->sysfs_state
);
5868 wait_event(mddev
->sb_wait
,
5869 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5870 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5873 void md_write_end(mddev_t
*mddev
)
5875 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5876 if (mddev
->safemode
== 2)
5877 md_wakeup_thread(mddev
->thread
);
5878 else if (mddev
->safemode_delay
)
5879 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5883 /* md_allow_write(mddev)
5884 * Calling this ensures that the array is marked 'active' so that writes
5885 * may proceed without blocking. It is important to call this before
5886 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5887 * Must be called with mddev_lock held.
5889 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5890 * is dropped, so return -EAGAIN after notifying userspace.
5892 int md_allow_write(mddev_t
*mddev
)
5898 if (!mddev
->pers
->sync_request
)
5901 spin_lock_irq(&mddev
->write_lock
);
5902 if (mddev
->in_sync
) {
5904 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5905 if (mddev
->safemode_delay
&&
5906 mddev
->safemode
== 0)
5907 mddev
->safemode
= 1;
5908 spin_unlock_irq(&mddev
->write_lock
);
5909 md_update_sb(mddev
, 0);
5910 sysfs_notify_dirent(mddev
->sysfs_state
);
5912 spin_unlock_irq(&mddev
->write_lock
);
5914 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
5919 EXPORT_SYMBOL_GPL(md_allow_write
);
5921 #define SYNC_MARKS 10
5922 #define SYNC_MARK_STEP (3*HZ)
5923 void md_do_sync(mddev_t
*mddev
)
5926 unsigned int currspeed
= 0,
5928 sector_t max_sectors
,j
, io_sectors
;
5929 unsigned long mark
[SYNC_MARKS
];
5930 sector_t mark_cnt
[SYNC_MARKS
];
5932 struct list_head
*tmp
;
5933 sector_t last_check
;
5938 /* just incase thread restarts... */
5939 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5941 if (mddev
->ro
) /* never try to sync a read-only array */
5944 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5945 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5946 desc
= "data-check";
5947 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5948 desc
= "requested-resync";
5951 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5956 /* we overload curr_resync somewhat here.
5957 * 0 == not engaged in resync at all
5958 * 2 == checking that there is no conflict with another sync
5959 * 1 == like 2, but have yielded to allow conflicting resync to
5961 * other == active in resync - this many blocks
5963 * Before starting a resync we must have set curr_resync to
5964 * 2, and then checked that every "conflicting" array has curr_resync
5965 * less than ours. When we find one that is the same or higher
5966 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5967 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5968 * This will mean we have to start checking from the beginning again.
5973 mddev
->curr_resync
= 2;
5976 if (kthread_should_stop()) {
5977 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5980 for_each_mddev(mddev2
, tmp
) {
5981 if (mddev2
== mddev
)
5983 if (!mddev
->parallel_resync
5984 && mddev2
->curr_resync
5985 && match_mddev_units(mddev
, mddev2
)) {
5987 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5988 /* arbitrarily yield */
5989 mddev
->curr_resync
= 1;
5990 wake_up(&resync_wait
);
5992 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5993 /* no need to wait here, we can wait the next
5994 * time 'round when curr_resync == 2
5997 /* We need to wait 'interruptible' so as not to
5998 * contribute to the load average, and not to
5999 * be caught by 'softlockup'
6001 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6002 if (!kthread_should_stop() &&
6003 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6004 printk(KERN_INFO
"md: delaying %s of %s"
6005 " until %s has finished (they"
6006 " share one or more physical units)\n",
6007 desc
, mdname(mddev
), mdname(mddev2
));
6009 if (signal_pending(current
))
6010 flush_signals(current
);
6012 finish_wait(&resync_wait
, &wq
);
6015 finish_wait(&resync_wait
, &wq
);
6018 } while (mddev
->curr_resync
< 2);
6021 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6022 /* resync follows the size requested by the personality,
6023 * which defaults to physical size, but can be virtual size
6025 max_sectors
= mddev
->resync_max_sectors
;
6026 mddev
->resync_mismatches
= 0;
6027 /* we don't use the checkpoint if there's a bitmap */
6028 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6029 j
= mddev
->resync_min
;
6030 else if (!mddev
->bitmap
)
6031 j
= mddev
->recovery_cp
;
6033 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6034 max_sectors
= mddev
->dev_sectors
;
6036 /* recovery follows the physical size of devices */
6037 max_sectors
= mddev
->dev_sectors
;
6039 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6040 if (rdev
->raid_disk
>= 0 &&
6041 !test_bit(Faulty
, &rdev
->flags
) &&
6042 !test_bit(In_sync
, &rdev
->flags
) &&
6043 rdev
->recovery_offset
< j
)
6044 j
= rdev
->recovery_offset
;
6047 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6048 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6049 " %d KB/sec/disk.\n", speed_min(mddev
));
6050 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6051 "(but not more than %d KB/sec) for %s.\n",
6052 speed_max(mddev
), desc
);
6054 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6057 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6059 mark_cnt
[m
] = io_sectors
;
6062 mddev
->resync_mark
= mark
[last_mark
];
6063 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6066 * Tune reconstruction:
6068 window
= 32*(PAGE_SIZE
/512);
6069 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6070 window
/2,(unsigned long long) max_sectors
/2);
6072 atomic_set(&mddev
->recovery_active
, 0);
6077 "md: resuming %s of %s from checkpoint.\n",
6078 desc
, mdname(mddev
));
6079 mddev
->curr_resync
= j
;
6082 while (j
< max_sectors
) {
6086 if (j
>= mddev
->resync_max
) {
6087 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6088 wait_event(mddev
->recovery_wait
,
6089 mddev
->resync_max
> j
6090 || kthread_should_stop());
6092 if (kthread_should_stop())
6095 if (mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6096 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6097 > (max_sectors
>> 4)) {
6098 /* time to update curr_resync_completed */
6099 blk_unplug(mddev
->queue
);
6100 wait_event(mddev
->recovery_wait
,
6101 atomic_read(&mddev
->recovery_active
) == 0);
6102 mddev
->curr_resync_completed
=
6104 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6106 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6107 currspeed
< speed_min(mddev
));
6109 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6113 if (!skipped
) { /* actual IO requested */
6114 io_sectors
+= sectors
;
6115 atomic_add(sectors
, &mddev
->recovery_active
);
6119 if (j
>1) mddev
->curr_resync
= j
;
6120 mddev
->curr_mark_cnt
= io_sectors
;
6121 if (last_check
== 0)
6122 /* this is the earliers that rebuilt will be
6123 * visible in /proc/mdstat
6125 md_new_event(mddev
);
6127 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6130 last_check
= io_sectors
;
6132 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6136 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6138 int next
= (last_mark
+1) % SYNC_MARKS
;
6140 mddev
->resync_mark
= mark
[next
];
6141 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6142 mark
[next
] = jiffies
;
6143 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6148 if (kthread_should_stop())
6153 * this loop exits only if either when we are slower than
6154 * the 'hard' speed limit, or the system was IO-idle for
6156 * the system might be non-idle CPU-wise, but we only care
6157 * about not overloading the IO subsystem. (things like an
6158 * e2fsck being done on the RAID array should execute fast)
6160 blk_unplug(mddev
->queue
);
6163 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6164 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6166 if (currspeed
> speed_min(mddev
)) {
6167 if ((currspeed
> speed_max(mddev
)) ||
6168 !is_mddev_idle(mddev
, 0)) {
6174 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6176 * this also signals 'finished resyncing' to md_stop
6179 blk_unplug(mddev
->queue
);
6181 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6183 /* tell personality that we are finished */
6184 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6186 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6187 mddev
->curr_resync
> 2) {
6188 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6189 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6190 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6192 "md: checkpointing %s of %s.\n",
6193 desc
, mdname(mddev
));
6194 mddev
->recovery_cp
= mddev
->curr_resync
;
6197 mddev
->recovery_cp
= MaxSector
;
6199 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6200 mddev
->curr_resync
= MaxSector
;
6201 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6202 if (rdev
->raid_disk
>= 0 &&
6203 !test_bit(Faulty
, &rdev
->flags
) &&
6204 !test_bit(In_sync
, &rdev
->flags
) &&
6205 rdev
->recovery_offset
< mddev
->curr_resync
)
6206 rdev
->recovery_offset
= mddev
->curr_resync
;
6209 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6212 mddev
->curr_resync
= 0;
6213 mddev
->resync_min
= 0;
6214 mddev
->resync_max
= MaxSector
;
6215 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6216 wake_up(&resync_wait
);
6217 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6218 md_wakeup_thread(mddev
->thread
);
6223 * got a signal, exit.
6226 "md: md_do_sync() got signal ... exiting\n");
6227 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6231 EXPORT_SYMBOL_GPL(md_do_sync
);
6234 static int remove_and_add_spares(mddev_t
*mddev
)
6239 mddev
->curr_resync_completed
= 0;
6241 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6242 if (rdev
->raid_disk
>= 0 &&
6243 !test_bit(Blocked
, &rdev
->flags
) &&
6244 (test_bit(Faulty
, &rdev
->flags
) ||
6245 ! test_bit(In_sync
, &rdev
->flags
)) &&
6246 atomic_read(&rdev
->nr_pending
)==0) {
6247 if (mddev
->pers
->hot_remove_disk(
6248 mddev
, rdev
->raid_disk
)==0) {
6250 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6251 sysfs_remove_link(&mddev
->kobj
, nm
);
6252 rdev
->raid_disk
= -1;
6256 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6257 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6258 if (rdev
->raid_disk
>= 0 &&
6259 !test_bit(In_sync
, &rdev
->flags
) &&
6260 !test_bit(Blocked
, &rdev
->flags
))
6262 if (rdev
->raid_disk
< 0
6263 && !test_bit(Faulty
, &rdev
->flags
)) {
6264 rdev
->recovery_offset
= 0;
6266 hot_add_disk(mddev
, rdev
) == 0) {
6268 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6269 if (sysfs_create_link(&mddev
->kobj
,
6272 "md: cannot register "
6276 md_new_event(mddev
);
6285 * This routine is regularly called by all per-raid-array threads to
6286 * deal with generic issues like resync and super-block update.
6287 * Raid personalities that don't have a thread (linear/raid0) do not
6288 * need this as they never do any recovery or update the superblock.
6290 * It does not do any resync itself, but rather "forks" off other threads
6291 * to do that as needed.
6292 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6293 * "->recovery" and create a thread at ->sync_thread.
6294 * When the thread finishes it sets MD_RECOVERY_DONE
6295 * and wakeups up this thread which will reap the thread and finish up.
6296 * This thread also removes any faulty devices (with nr_pending == 0).
6298 * The overall approach is:
6299 * 1/ if the superblock needs updating, update it.
6300 * 2/ If a recovery thread is running, don't do anything else.
6301 * 3/ If recovery has finished, clean up, possibly marking spares active.
6302 * 4/ If there are any faulty devices, remove them.
6303 * 5/ If array is degraded, try to add spares devices
6304 * 6/ If array has spares or is not in-sync, start a resync thread.
6306 void md_check_recovery(mddev_t
*mddev
)
6312 bitmap_daemon_work(mddev
->bitmap
);
6317 if (signal_pending(current
)) {
6318 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6319 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6321 mddev
->safemode
= 2;
6323 flush_signals(current
);
6326 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6329 (mddev
->flags
&& !mddev
->external
) ||
6330 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6331 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6332 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6333 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6334 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6338 if (mddev_trylock(mddev
)) {
6342 /* Only thing we do on a ro array is remove
6345 remove_and_add_spares(mddev
);
6346 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6350 if (!mddev
->external
) {
6352 spin_lock_irq(&mddev
->write_lock
);
6353 if (mddev
->safemode
&&
6354 !atomic_read(&mddev
->writes_pending
) &&
6356 mddev
->recovery_cp
== MaxSector
) {
6359 if (mddev
->persistent
)
6360 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6362 if (mddev
->safemode
== 1)
6363 mddev
->safemode
= 0;
6364 spin_unlock_irq(&mddev
->write_lock
);
6366 sysfs_notify_dirent(mddev
->sysfs_state
);
6370 md_update_sb(mddev
, 0);
6372 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6373 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6374 sysfs_notify_dirent(rdev
->sysfs_state
);
6377 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6378 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6379 /* resync/recovery still happening */
6380 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6383 if (mddev
->sync_thread
) {
6384 /* resync has finished, collect result */
6385 md_unregister_thread(mddev
->sync_thread
);
6386 mddev
->sync_thread
= NULL
;
6387 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6388 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6390 /* activate any spares */
6391 if (mddev
->pers
->spare_active(mddev
))
6392 sysfs_notify(&mddev
->kobj
, NULL
,
6395 md_update_sb(mddev
, 1);
6397 /* if array is no-longer degraded, then any saved_raid_disk
6398 * information must be scrapped
6400 if (!mddev
->degraded
)
6401 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6402 rdev
->saved_raid_disk
= -1;
6404 mddev
->recovery
= 0;
6405 /* flag recovery needed just to double check */
6406 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6407 sysfs_notify_dirent(mddev
->sysfs_action
);
6408 md_new_event(mddev
);
6411 /* Set RUNNING before clearing NEEDED to avoid
6412 * any transients in the value of "sync_action".
6414 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6415 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6416 /* Clear some bits that don't mean anything, but
6419 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6420 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6422 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6424 /* no recovery is running.
6425 * remove any failed drives, then
6426 * add spares if possible.
6427 * Spare are also removed and re-added, to allow
6428 * the personality to fail the re-add.
6431 if (mddev
->reshape_position
!= MaxSector
) {
6432 if (mddev
->pers
->check_reshape(mddev
) != 0)
6433 /* Cannot proceed */
6435 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6436 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6437 } else if ((spares
= remove_and_add_spares(mddev
))) {
6438 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6439 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6440 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6441 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6442 } else if (mddev
->recovery_cp
< MaxSector
) {
6443 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6444 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6445 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6446 /* nothing to be done ... */
6449 if (mddev
->pers
->sync_request
) {
6450 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6451 /* We are adding a device or devices to an array
6452 * which has the bitmap stored on all devices.
6453 * So make sure all bitmap pages get written
6455 bitmap_write_all(mddev
->bitmap
);
6457 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6460 if (!mddev
->sync_thread
) {
6461 printk(KERN_ERR
"%s: could not start resync"
6464 /* leave the spares where they are, it shouldn't hurt */
6465 mddev
->recovery
= 0;
6467 md_wakeup_thread(mddev
->sync_thread
);
6468 sysfs_notify_dirent(mddev
->sysfs_action
);
6469 md_new_event(mddev
);
6472 if (!mddev
->sync_thread
) {
6473 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6474 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6476 if (mddev
->sysfs_action
)
6477 sysfs_notify_dirent(mddev
->sysfs_action
);
6479 mddev_unlock(mddev
);
6483 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6485 sysfs_notify_dirent(rdev
->sysfs_state
);
6486 wait_event_timeout(rdev
->blocked_wait
,
6487 !test_bit(Blocked
, &rdev
->flags
),
6488 msecs_to_jiffies(5000));
6489 rdev_dec_pending(rdev
, mddev
);
6491 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6493 static int md_notify_reboot(struct notifier_block
*this,
6494 unsigned long code
, void *x
)
6496 struct list_head
*tmp
;
6499 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6501 printk(KERN_INFO
"md: stopping all md devices.\n");
6503 for_each_mddev(mddev
, tmp
)
6504 if (mddev_trylock(mddev
)) {
6505 /* Force a switch to readonly even array
6506 * appears to still be in use. Hence
6509 do_md_stop(mddev
, 1, 100);
6510 mddev_unlock(mddev
);
6513 * certain more exotic SCSI devices are known to be
6514 * volatile wrt too early system reboots. While the
6515 * right place to handle this issue is the given
6516 * driver, we do want to have a safe RAID driver ...
6523 static struct notifier_block md_notifier
= {
6524 .notifier_call
= md_notify_reboot
,
6526 .priority
= INT_MAX
, /* before any real devices */
6529 static void md_geninit(void)
6531 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6533 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6536 static int __init
md_init(void)
6538 if (register_blkdev(MD_MAJOR
, "md"))
6540 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6541 unregister_blkdev(MD_MAJOR
, "md");
6544 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6545 md_probe
, NULL
, NULL
);
6546 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6547 md_probe
, NULL
, NULL
);
6549 register_reboot_notifier(&md_notifier
);
6550 raid_table_header
= register_sysctl_table(raid_root_table
);
6560 * Searches all registered partitions for autorun RAID arrays
6564 static LIST_HEAD(all_detected_devices
);
6565 struct detected_devices_node
{
6566 struct list_head list
;
6570 void md_autodetect_dev(dev_t dev
)
6572 struct detected_devices_node
*node_detected_dev
;
6574 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6575 if (node_detected_dev
) {
6576 node_detected_dev
->dev
= dev
;
6577 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6579 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6580 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6585 static void autostart_arrays(int part
)
6588 struct detected_devices_node
*node_detected_dev
;
6590 int i_scanned
, i_passed
;
6595 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6597 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6599 node_detected_dev
= list_entry(all_detected_devices
.next
,
6600 struct detected_devices_node
, list
);
6601 list_del(&node_detected_dev
->list
);
6602 dev
= node_detected_dev
->dev
;
6603 kfree(node_detected_dev
);
6604 rdev
= md_import_device(dev
,0, 90);
6608 if (test_bit(Faulty
, &rdev
->flags
)) {
6612 set_bit(AutoDetected
, &rdev
->flags
);
6613 list_add(&rdev
->same_set
, &pending_raid_disks
);
6617 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6618 i_scanned
, i_passed
);
6620 autorun_devices(part
);
6623 #endif /* !MODULE */
6625 static __exit
void md_exit(void)
6628 struct list_head
*tmp
;
6630 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
6631 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6633 unregister_blkdev(MD_MAJOR
,"md");
6634 unregister_blkdev(mdp_major
, "mdp");
6635 unregister_reboot_notifier(&md_notifier
);
6636 unregister_sysctl_table(raid_table_header
);
6637 remove_proc_entry("mdstat", NULL
);
6638 for_each_mddev(mddev
, tmp
) {
6639 export_array(mddev
);
6640 mddev
->hold_active
= 0;
6644 subsys_initcall(md_init
);
6645 module_exit(md_exit
)
6647 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6649 return sprintf(buffer
, "%d", start_readonly
);
6651 static int set_ro(const char *val
, struct kernel_param
*kp
)
6654 int num
= simple_strtoul(val
, &e
, 10);
6655 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6656 start_readonly
= num
;
6662 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6663 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6665 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
6667 EXPORT_SYMBOL(register_md_personality
);
6668 EXPORT_SYMBOL(unregister_md_personality
);
6669 EXPORT_SYMBOL(md_error
);
6670 EXPORT_SYMBOL(md_done_sync
);
6671 EXPORT_SYMBOL(md_write_start
);
6672 EXPORT_SYMBOL(md_write_end
);
6673 EXPORT_SYMBOL(md_register_thread
);
6674 EXPORT_SYMBOL(md_unregister_thread
);
6675 EXPORT_SYMBOL(md_wakeup_thread
);
6676 EXPORT_SYMBOL(md_check_recovery
);
6677 MODULE_LICENSE("GPL");
6679 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);