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/raid/md.h>
37 #include <linux/raid/bitmap.h>
38 #include <linux/sysctl.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>
49 #define MAJOR_NR MD_MAJOR
51 /* 63 partitions with the alternate major number (mdp) */
52 #define MdpMinorShift 6
55 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59 static void autostart_arrays(int part
);
62 static LIST_HEAD(pers_list
);
63 static DEFINE_SPINLOCK(pers_lock
);
65 static void md_print_devices(void);
67 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
69 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
72 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
73 * is 1000 KB/sec, so the extra system load does not show up that much.
74 * Increase it if you want to have more _guaranteed_ speed. Note that
75 * the RAID driver will use the maximum available bandwidth if the IO
76 * subsystem is idle. There is also an 'absolute maximum' reconstruction
77 * speed limit - in case reconstruction slows down your system despite
80 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
81 * or /sys/block/mdX/md/sync_speed_{min,max}
84 static int sysctl_speed_limit_min
= 1000;
85 static int sysctl_speed_limit_max
= 200000;
86 static inline int speed_min(mddev_t
*mddev
)
88 return mddev
->sync_speed_min
?
89 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
92 static inline int speed_max(mddev_t
*mddev
)
94 return mddev
->sync_speed_max
?
95 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
98 static struct ctl_table_header
*raid_table_header
;
100 static ctl_table raid_table
[] = {
102 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
103 .procname
= "speed_limit_min",
104 .data
= &sysctl_speed_limit_min
,
105 .maxlen
= sizeof(int),
106 .mode
= S_IRUGO
|S_IWUSR
,
107 .proc_handler
= &proc_dointvec
,
110 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
111 .procname
= "speed_limit_max",
112 .data
= &sysctl_speed_limit_max
,
113 .maxlen
= sizeof(int),
114 .mode
= S_IRUGO
|S_IWUSR
,
115 .proc_handler
= &proc_dointvec
,
120 static ctl_table raid_dir_table
[] = {
122 .ctl_name
= DEV_RAID
,
125 .mode
= S_IRUGO
|S_IXUGO
,
131 static ctl_table raid_root_table
[] = {
137 .child
= raid_dir_table
,
142 static struct block_device_operations md_fops
;
144 static int start_readonly
;
147 * We have a system wide 'event count' that is incremented
148 * on any 'interesting' event, and readers of /proc/mdstat
149 * can use 'poll' or 'select' to find out when the event
153 * start array, stop array, error, add device, remove device,
154 * start build, activate spare
156 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
157 static atomic_t md_event_count
;
158 void md_new_event(mddev_t
*mddev
)
160 atomic_inc(&md_event_count
);
161 wake_up(&md_event_waiters
);
163 EXPORT_SYMBOL_GPL(md_new_event
);
165 /* Alternate version that can be called from interrupts
166 * when calling sysfs_notify isn't needed.
168 static void md_new_event_inintr(mddev_t
*mddev
)
170 atomic_inc(&md_event_count
);
171 wake_up(&md_event_waiters
);
175 * Enables to iterate over all existing md arrays
176 * all_mddevs_lock protects this list.
178 static LIST_HEAD(all_mddevs
);
179 static DEFINE_SPINLOCK(all_mddevs_lock
);
183 * iterates through all used mddevs in the system.
184 * We take care to grab the all_mddevs_lock whenever navigating
185 * the list, and to always hold a refcount when unlocked.
186 * Any code which breaks out of this loop while own
187 * a reference to the current mddev and must mddev_put it.
189 #define for_each_mddev(mddev,tmp) \
191 for (({ spin_lock(&all_mddevs_lock); \
192 tmp = all_mddevs.next; \
194 ({ if (tmp != &all_mddevs) \
195 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
196 spin_unlock(&all_mddevs_lock); \
197 if (mddev) mddev_put(mddev); \
198 mddev = list_entry(tmp, mddev_t, all_mddevs); \
199 tmp != &all_mddevs;}); \
200 ({ spin_lock(&all_mddevs_lock); \
205 static int md_fail_request(struct request_queue
*q
, struct bio
*bio
)
211 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
213 atomic_inc(&mddev
->active
);
217 static void mddev_put(mddev_t
*mddev
)
219 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
221 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
222 list_del(&mddev
->all_mddevs
);
223 spin_unlock(&all_mddevs_lock
);
224 kobject_put(&mddev
->kobj
);
226 spin_unlock(&all_mddevs_lock
);
229 static mddev_t
* mddev_find(dev_t unit
)
231 mddev_t
*mddev
, *new = NULL
;
234 spin_lock(&all_mddevs_lock
);
235 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
236 if (mddev
->unit
== unit
) {
238 spin_unlock(&all_mddevs_lock
);
244 list_add(&new->all_mddevs
, &all_mddevs
);
245 spin_unlock(&all_mddevs_lock
);
248 spin_unlock(&all_mddevs_lock
);
250 new = kzalloc(sizeof(*new), GFP_KERNEL
);
255 if (MAJOR(unit
) == MD_MAJOR
)
256 new->md_minor
= MINOR(unit
);
258 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
260 mutex_init(&new->reconfig_mutex
);
261 INIT_LIST_HEAD(&new->disks
);
262 INIT_LIST_HEAD(&new->all_mddevs
);
263 init_timer(&new->safemode_timer
);
264 atomic_set(&new->active
, 1);
265 atomic_set(&new->openers
, 0);
266 spin_lock_init(&new->write_lock
);
267 init_waitqueue_head(&new->sb_wait
);
268 init_waitqueue_head(&new->recovery_wait
);
269 new->reshape_position
= MaxSector
;
271 new->resync_max
= MaxSector
;
272 new->level
= LEVEL_NONE
;
277 static inline int mddev_lock(mddev_t
* mddev
)
279 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
282 static inline int mddev_trylock(mddev_t
* mddev
)
284 return mutex_trylock(&mddev
->reconfig_mutex
);
287 static inline void mddev_unlock(mddev_t
* mddev
)
289 mutex_unlock(&mddev
->reconfig_mutex
);
291 md_wakeup_thread(mddev
->thread
);
294 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
298 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
299 if (rdev
->desc_nr
== nr
)
305 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
309 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
310 if (rdev
->bdev
->bd_dev
== dev
)
316 static struct mdk_personality
*find_pers(int level
, char *clevel
)
318 struct mdk_personality
*pers
;
319 list_for_each_entry(pers
, &pers_list
, list
) {
320 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
322 if (strcmp(pers
->name
, clevel
)==0)
328 /* return the offset of the super block in 512byte sectors */
329 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
331 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
332 return MD_NEW_SIZE_SECTORS(num_sectors
);
335 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
337 sector_t num_sectors
= rdev
->sb_start
;
340 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
344 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
349 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
350 if (!rdev
->sb_page
) {
351 printk(KERN_ALERT
"md: out of memory.\n");
358 static void free_disk_sb(mdk_rdev_t
* rdev
)
361 put_page(rdev
->sb_page
);
363 rdev
->sb_page
= NULL
;
370 static void super_written(struct bio
*bio
, int error
)
372 mdk_rdev_t
*rdev
= bio
->bi_private
;
373 mddev_t
*mddev
= rdev
->mddev
;
375 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
376 printk("md: super_written gets error=%d, uptodate=%d\n",
377 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
378 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
379 md_error(mddev
, rdev
);
382 if (atomic_dec_and_test(&mddev
->pending_writes
))
383 wake_up(&mddev
->sb_wait
);
387 static void super_written_barrier(struct bio
*bio
, int error
)
389 struct bio
*bio2
= bio
->bi_private
;
390 mdk_rdev_t
*rdev
= bio2
->bi_private
;
391 mddev_t
*mddev
= rdev
->mddev
;
393 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
394 error
== -EOPNOTSUPP
) {
396 /* barriers don't appear to be supported :-( */
397 set_bit(BarriersNotsupp
, &rdev
->flags
);
398 mddev
->barriers_work
= 0;
399 spin_lock_irqsave(&mddev
->write_lock
, flags
);
400 bio2
->bi_next
= mddev
->biolist
;
401 mddev
->biolist
= bio2
;
402 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
403 wake_up(&mddev
->sb_wait
);
407 bio
->bi_private
= rdev
;
408 super_written(bio
, error
);
412 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
413 sector_t sector
, int size
, struct page
*page
)
415 /* write first size bytes of page to sector of rdev
416 * Increment mddev->pending_writes before returning
417 * and decrement it on completion, waking up sb_wait
418 * if zero is reached.
419 * If an error occurred, call md_error
421 * As we might need to resubmit the request if BIO_RW_BARRIER
422 * causes ENOTSUPP, we allocate a spare bio...
424 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
425 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
427 bio
->bi_bdev
= rdev
->bdev
;
428 bio
->bi_sector
= sector
;
429 bio_add_page(bio
, page
, size
, 0);
430 bio
->bi_private
= rdev
;
431 bio
->bi_end_io
= super_written
;
434 atomic_inc(&mddev
->pending_writes
);
435 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
437 rw
|= (1<<BIO_RW_BARRIER
);
438 rbio
= bio_clone(bio
, GFP_NOIO
);
439 rbio
->bi_private
= bio
;
440 rbio
->bi_end_io
= super_written_barrier
;
441 submit_bio(rw
, rbio
);
446 void md_super_wait(mddev_t
*mddev
)
448 /* wait for all superblock writes that were scheduled to complete.
449 * if any had to be retried (due to BARRIER problems), retry them
453 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
454 if (atomic_read(&mddev
->pending_writes
)==0)
456 while (mddev
->biolist
) {
458 spin_lock_irq(&mddev
->write_lock
);
459 bio
= mddev
->biolist
;
460 mddev
->biolist
= bio
->bi_next
;
462 spin_unlock_irq(&mddev
->write_lock
);
463 submit_bio(bio
->bi_rw
, bio
);
467 finish_wait(&mddev
->sb_wait
, &wq
);
470 static void bi_complete(struct bio
*bio
, int error
)
472 complete((struct completion
*)bio
->bi_private
);
475 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
476 struct page
*page
, int rw
)
478 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
479 struct completion event
;
482 rw
|= (1 << BIO_RW_SYNC
);
485 bio
->bi_sector
= sector
;
486 bio_add_page(bio
, page
, size
, 0);
487 init_completion(&event
);
488 bio
->bi_private
= &event
;
489 bio
->bi_end_io
= bi_complete
;
491 wait_for_completion(&event
);
493 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
497 EXPORT_SYMBOL_GPL(sync_page_io
);
499 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
501 char b
[BDEVNAME_SIZE
];
502 if (!rdev
->sb_page
) {
510 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
516 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
517 bdevname(rdev
->bdev
,b
));
521 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
523 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
524 sb1
->set_uuid1
== sb2
->set_uuid1
&&
525 sb1
->set_uuid2
== sb2
->set_uuid2
&&
526 sb1
->set_uuid3
== sb2
->set_uuid3
;
529 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
532 mdp_super_t
*tmp1
, *tmp2
;
534 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
535 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
537 if (!tmp1
|| !tmp2
) {
539 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
547 * nr_disks is not constant
552 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
560 static u32
md_csum_fold(u32 csum
)
562 csum
= (csum
& 0xffff) + (csum
>> 16);
563 return (csum
& 0xffff) + (csum
>> 16);
566 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
569 u32
*sb32
= (u32
*)sb
;
571 unsigned int disk_csum
, csum
;
573 disk_csum
= sb
->sb_csum
;
576 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
578 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
582 /* This used to use csum_partial, which was wrong for several
583 * reasons including that different results are returned on
584 * different architectures. It isn't critical that we get exactly
585 * the same return value as before (we always csum_fold before
586 * testing, and that removes any differences). However as we
587 * know that csum_partial always returned a 16bit value on
588 * alphas, do a fold to maximise conformity to previous behaviour.
590 sb
->sb_csum
= md_csum_fold(disk_csum
);
592 sb
->sb_csum
= disk_csum
;
599 * Handle superblock details.
600 * We want to be able to handle multiple superblock formats
601 * so we have a common interface to them all, and an array of
602 * different handlers.
603 * We rely on user-space to write the initial superblock, and support
604 * reading and updating of superblocks.
605 * Interface methods are:
606 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
607 * loads and validates a superblock on dev.
608 * if refdev != NULL, compare superblocks on both devices
610 * 0 - dev has a superblock that is compatible with refdev
611 * 1 - dev has a superblock that is compatible and newer than refdev
612 * so dev should be used as the refdev in future
613 * -EINVAL superblock incompatible or invalid
614 * -othererror e.g. -EIO
616 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
617 * Verify that dev is acceptable into mddev.
618 * The first time, mddev->raid_disks will be 0, and data from
619 * dev should be merged in. Subsequent calls check that dev
620 * is new enough. Return 0 or -EINVAL
622 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
623 * Update the superblock for rdev with data in mddev
624 * This does not write to disc.
630 struct module
*owner
;
631 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
633 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
634 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
635 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
636 sector_t num_sectors
);
640 * load_super for 0.90.0
642 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
644 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
649 * Calculate the position of the superblock (512byte sectors),
650 * it's at the end of the disk.
652 * It also happens to be a multiple of 4Kb.
654 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
656 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
661 bdevname(rdev
->bdev
, b
);
662 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
664 if (sb
->md_magic
!= MD_SB_MAGIC
) {
665 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
670 if (sb
->major_version
!= 0 ||
671 sb
->minor_version
< 90 ||
672 sb
->minor_version
> 91) {
673 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
674 sb
->major_version
, sb
->minor_version
,
679 if (sb
->raid_disks
<= 0)
682 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
683 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
688 rdev
->preferred_minor
= sb
->md_minor
;
689 rdev
->data_offset
= 0;
690 rdev
->sb_size
= MD_SB_BYTES
;
692 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
693 if (sb
->level
!= 1 && sb
->level
!= 4
694 && sb
->level
!= 5 && sb
->level
!= 6
695 && sb
->level
!= 10) {
696 /* FIXME use a better test */
698 "md: bitmaps not supported for this level.\n");
703 if (sb
->level
== LEVEL_MULTIPATH
)
706 rdev
->desc_nr
= sb
->this_disk
.number
;
712 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
713 if (!uuid_equal(refsb
, sb
)) {
714 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
715 b
, bdevname(refdev
->bdev
,b2
));
718 if (!sb_equal(refsb
, sb
)) {
719 printk(KERN_WARNING
"md: %s has same UUID"
720 " but different superblock to %s\n",
721 b
, bdevname(refdev
->bdev
, b2
));
725 ev2
= md_event(refsb
);
731 rdev
->size
= calc_num_sectors(rdev
, sb
->chunk_size
) / 2;
733 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
734 /* "this cannot possibly happen" ... */
742 * validate_super for 0.90.0
744 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
747 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
748 __u64 ev1
= md_event(sb
);
750 rdev
->raid_disk
= -1;
751 clear_bit(Faulty
, &rdev
->flags
);
752 clear_bit(In_sync
, &rdev
->flags
);
753 clear_bit(WriteMostly
, &rdev
->flags
);
754 clear_bit(BarriersNotsupp
, &rdev
->flags
);
756 if (mddev
->raid_disks
== 0) {
757 mddev
->major_version
= 0;
758 mddev
->minor_version
= sb
->minor_version
;
759 mddev
->patch_version
= sb
->patch_version
;
761 mddev
->chunk_size
= sb
->chunk_size
;
762 mddev
->ctime
= sb
->ctime
;
763 mddev
->utime
= sb
->utime
;
764 mddev
->level
= sb
->level
;
765 mddev
->clevel
[0] = 0;
766 mddev
->layout
= sb
->layout
;
767 mddev
->raid_disks
= sb
->raid_disks
;
768 mddev
->size
= sb
->size
;
770 mddev
->bitmap_offset
= 0;
771 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
773 if (mddev
->minor_version
>= 91) {
774 mddev
->reshape_position
= sb
->reshape_position
;
775 mddev
->delta_disks
= sb
->delta_disks
;
776 mddev
->new_level
= sb
->new_level
;
777 mddev
->new_layout
= sb
->new_layout
;
778 mddev
->new_chunk
= sb
->new_chunk
;
780 mddev
->reshape_position
= MaxSector
;
781 mddev
->delta_disks
= 0;
782 mddev
->new_level
= mddev
->level
;
783 mddev
->new_layout
= mddev
->layout
;
784 mddev
->new_chunk
= mddev
->chunk_size
;
787 if (sb
->state
& (1<<MD_SB_CLEAN
))
788 mddev
->recovery_cp
= MaxSector
;
790 if (sb
->events_hi
== sb
->cp_events_hi
&&
791 sb
->events_lo
== sb
->cp_events_lo
) {
792 mddev
->recovery_cp
= sb
->recovery_cp
;
794 mddev
->recovery_cp
= 0;
797 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
798 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
799 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
800 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
802 mddev
->max_disks
= MD_SB_DISKS
;
804 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
805 mddev
->bitmap_file
== NULL
)
806 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
808 } else if (mddev
->pers
== NULL
) {
809 /* Insist on good event counter while assembling */
811 if (ev1
< mddev
->events
)
813 } else if (mddev
->bitmap
) {
814 /* if adding to array with a bitmap, then we can accept an
815 * older device ... but not too old.
817 if (ev1
< mddev
->bitmap
->events_cleared
)
820 if (ev1
< mddev
->events
)
821 /* just a hot-add of a new device, leave raid_disk at -1 */
825 if (mddev
->level
!= LEVEL_MULTIPATH
) {
826 desc
= sb
->disks
+ rdev
->desc_nr
;
828 if (desc
->state
& (1<<MD_DISK_FAULTY
))
829 set_bit(Faulty
, &rdev
->flags
);
830 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
831 desc->raid_disk < mddev->raid_disks */) {
832 set_bit(In_sync
, &rdev
->flags
);
833 rdev
->raid_disk
= desc
->raid_disk
;
835 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
836 set_bit(WriteMostly
, &rdev
->flags
);
837 } else /* MULTIPATH are always insync */
838 set_bit(In_sync
, &rdev
->flags
);
843 * sync_super for 0.90.0
845 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
849 int next_spare
= mddev
->raid_disks
;
852 /* make rdev->sb match mddev data..
855 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
856 * 3/ any empty disks < next_spare become removed
858 * disks[0] gets initialised to REMOVED because
859 * we cannot be sure from other fields if it has
860 * been initialised or not.
863 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
865 rdev
->sb_size
= MD_SB_BYTES
;
867 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
869 memset(sb
, 0, sizeof(*sb
));
871 sb
->md_magic
= MD_SB_MAGIC
;
872 sb
->major_version
= mddev
->major_version
;
873 sb
->patch_version
= mddev
->patch_version
;
874 sb
->gvalid_words
= 0; /* ignored */
875 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
876 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
877 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
878 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
880 sb
->ctime
= mddev
->ctime
;
881 sb
->level
= mddev
->level
;
882 sb
->size
= mddev
->size
;
883 sb
->raid_disks
= mddev
->raid_disks
;
884 sb
->md_minor
= mddev
->md_minor
;
885 sb
->not_persistent
= 0;
886 sb
->utime
= mddev
->utime
;
888 sb
->events_hi
= (mddev
->events
>>32);
889 sb
->events_lo
= (u32
)mddev
->events
;
891 if (mddev
->reshape_position
== MaxSector
)
892 sb
->minor_version
= 90;
894 sb
->minor_version
= 91;
895 sb
->reshape_position
= mddev
->reshape_position
;
896 sb
->new_level
= mddev
->new_level
;
897 sb
->delta_disks
= mddev
->delta_disks
;
898 sb
->new_layout
= mddev
->new_layout
;
899 sb
->new_chunk
= mddev
->new_chunk
;
901 mddev
->minor_version
= sb
->minor_version
;
904 sb
->recovery_cp
= mddev
->recovery_cp
;
905 sb
->cp_events_hi
= (mddev
->events
>>32);
906 sb
->cp_events_lo
= (u32
)mddev
->events
;
907 if (mddev
->recovery_cp
== MaxSector
)
908 sb
->state
= (1<< MD_SB_CLEAN
);
912 sb
->layout
= mddev
->layout
;
913 sb
->chunk_size
= mddev
->chunk_size
;
915 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
916 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
918 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
919 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
922 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
923 && !test_bit(Faulty
, &rdev2
->flags
))
924 desc_nr
= rdev2
->raid_disk
;
926 desc_nr
= next_spare
++;
927 rdev2
->desc_nr
= desc_nr
;
928 d
= &sb
->disks
[rdev2
->desc_nr
];
930 d
->number
= rdev2
->desc_nr
;
931 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
932 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
933 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
934 && !test_bit(Faulty
, &rdev2
->flags
))
935 d
->raid_disk
= rdev2
->raid_disk
;
937 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
938 if (test_bit(Faulty
, &rdev2
->flags
))
939 d
->state
= (1<<MD_DISK_FAULTY
);
940 else if (test_bit(In_sync
, &rdev2
->flags
)) {
941 d
->state
= (1<<MD_DISK_ACTIVE
);
942 d
->state
|= (1<<MD_DISK_SYNC
);
950 if (test_bit(WriteMostly
, &rdev2
->flags
))
951 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
953 /* now set the "removed" and "faulty" bits on any missing devices */
954 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
955 mdp_disk_t
*d
= &sb
->disks
[i
];
956 if (d
->state
== 0 && d
->number
== 0) {
959 d
->state
= (1<<MD_DISK_REMOVED
);
960 d
->state
|= (1<<MD_DISK_FAULTY
);
964 sb
->nr_disks
= nr_disks
;
965 sb
->active_disks
= active
;
966 sb
->working_disks
= working
;
967 sb
->failed_disks
= failed
;
968 sb
->spare_disks
= spare
;
970 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
971 sb
->sb_csum
= calc_sb_csum(sb
);
975 * rdev_size_change for 0.90.0
977 static unsigned long long
978 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
980 if (num_sectors
&& num_sectors
< rdev
->mddev
->size
* 2)
981 return 0; /* component must fit device */
982 if (rdev
->mddev
->bitmap_offset
)
983 return 0; /* can't move bitmap */
984 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
985 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
986 num_sectors
= rdev
->sb_start
;
987 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
989 md_super_wait(rdev
->mddev
);
990 return num_sectors
/ 2; /* kB for sysfs */
995 * version 1 superblock
998 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1002 unsigned long long newcsum
;
1003 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1004 __le32
*isuper
= (__le32
*)sb
;
1007 disk_csum
= sb
->sb_csum
;
1010 for (i
=0; size
>=4; size
-= 4 )
1011 newcsum
+= le32_to_cpu(*isuper
++);
1014 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1016 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1017 sb
->sb_csum
= disk_csum
;
1018 return cpu_to_le32(csum
);
1021 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1023 struct mdp_superblock_1
*sb
;
1026 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1030 * Calculate the position of the superblock in 512byte sectors.
1031 * It is always aligned to a 4K boundary and
1032 * depeding on minor_version, it can be:
1033 * 0: At least 8K, but less than 12K, from end of device
1034 * 1: At start of device
1035 * 2: 4K from start of device.
1037 switch(minor_version
) {
1039 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1041 sb_start
&= ~(sector_t
)(4*2-1);
1052 rdev
->sb_start
= sb_start
;
1054 /* superblock is rarely larger than 1K, but it can be larger,
1055 * and it is safe to read 4k, so we do that
1057 ret
= read_disk_sb(rdev
, 4096);
1058 if (ret
) return ret
;
1061 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1063 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1064 sb
->major_version
!= cpu_to_le32(1) ||
1065 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1066 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1067 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1070 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1071 printk("md: invalid superblock checksum on %s\n",
1072 bdevname(rdev
->bdev
,b
));
1075 if (le64_to_cpu(sb
->data_size
) < 10) {
1076 printk("md: data_size too small on %s\n",
1077 bdevname(rdev
->bdev
,b
));
1080 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1081 if (sb
->level
!= cpu_to_le32(1) &&
1082 sb
->level
!= cpu_to_le32(4) &&
1083 sb
->level
!= cpu_to_le32(5) &&
1084 sb
->level
!= cpu_to_le32(6) &&
1085 sb
->level
!= cpu_to_le32(10)) {
1087 "md: bitmaps not supported for this level.\n");
1092 rdev
->preferred_minor
= 0xffff;
1093 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1094 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1096 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1097 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1098 if (rdev
->sb_size
& bmask
)
1099 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1102 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1105 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1108 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1114 struct mdp_superblock_1
*refsb
=
1115 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1117 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1118 sb
->level
!= refsb
->level
||
1119 sb
->layout
!= refsb
->layout
||
1120 sb
->chunksize
!= refsb
->chunksize
) {
1121 printk(KERN_WARNING
"md: %s has strangely different"
1122 " superblock to %s\n",
1123 bdevname(rdev
->bdev
,b
),
1124 bdevname(refdev
->bdev
,b2
));
1127 ev1
= le64_to_cpu(sb
->events
);
1128 ev2
= le64_to_cpu(refsb
->events
);
1136 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1138 rdev
->size
= rdev
->sb_start
/ 2;
1139 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1141 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1142 if (le32_to_cpu(sb
->chunksize
))
1143 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1145 if (le64_to_cpu(sb
->size
) > rdev
->size
*2)
1150 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1152 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1153 __u64 ev1
= le64_to_cpu(sb
->events
);
1155 rdev
->raid_disk
= -1;
1156 clear_bit(Faulty
, &rdev
->flags
);
1157 clear_bit(In_sync
, &rdev
->flags
);
1158 clear_bit(WriteMostly
, &rdev
->flags
);
1159 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1161 if (mddev
->raid_disks
== 0) {
1162 mddev
->major_version
= 1;
1163 mddev
->patch_version
= 0;
1164 mddev
->external
= 0;
1165 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1166 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1167 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1168 mddev
->level
= le32_to_cpu(sb
->level
);
1169 mddev
->clevel
[0] = 0;
1170 mddev
->layout
= le32_to_cpu(sb
->layout
);
1171 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1172 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1173 mddev
->events
= ev1
;
1174 mddev
->bitmap_offset
= 0;
1175 mddev
->default_bitmap_offset
= 1024 >> 9;
1177 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1178 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1180 mddev
->max_disks
= (4096-256)/2;
1182 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1183 mddev
->bitmap_file
== NULL
)
1184 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1186 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1187 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1188 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1189 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1190 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1191 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1193 mddev
->reshape_position
= MaxSector
;
1194 mddev
->delta_disks
= 0;
1195 mddev
->new_level
= mddev
->level
;
1196 mddev
->new_layout
= mddev
->layout
;
1197 mddev
->new_chunk
= mddev
->chunk_size
;
1200 } else if (mddev
->pers
== NULL
) {
1201 /* Insist of good event counter while assembling */
1203 if (ev1
< mddev
->events
)
1205 } else if (mddev
->bitmap
) {
1206 /* If adding to array with a bitmap, then we can accept an
1207 * older device, but not too old.
1209 if (ev1
< mddev
->bitmap
->events_cleared
)
1212 if (ev1
< mddev
->events
)
1213 /* just a hot-add of a new device, leave raid_disk at -1 */
1216 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1218 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1220 case 0xffff: /* spare */
1222 case 0xfffe: /* faulty */
1223 set_bit(Faulty
, &rdev
->flags
);
1226 if ((le32_to_cpu(sb
->feature_map
) &
1227 MD_FEATURE_RECOVERY_OFFSET
))
1228 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1230 set_bit(In_sync
, &rdev
->flags
);
1231 rdev
->raid_disk
= role
;
1234 if (sb
->devflags
& WriteMostly1
)
1235 set_bit(WriteMostly
, &rdev
->flags
);
1236 } else /* MULTIPATH are always insync */
1237 set_bit(In_sync
, &rdev
->flags
);
1242 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1244 struct mdp_superblock_1
*sb
;
1247 /* make rdev->sb match mddev and rdev data. */
1249 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1251 sb
->feature_map
= 0;
1253 sb
->recovery_offset
= cpu_to_le64(0);
1254 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1255 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1256 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1258 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1259 sb
->events
= cpu_to_le64(mddev
->events
);
1261 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1263 sb
->resync_offset
= cpu_to_le64(0);
1265 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1267 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1268 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1270 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1271 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1272 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1275 if (rdev
->raid_disk
>= 0 &&
1276 !test_bit(In_sync
, &rdev
->flags
) &&
1277 rdev
->recovery_offset
> 0) {
1278 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1279 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1282 if (mddev
->reshape_position
!= MaxSector
) {
1283 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1284 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1285 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1286 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1287 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1288 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1292 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1293 if (rdev2
->desc_nr
+1 > max_dev
)
1294 max_dev
= rdev2
->desc_nr
+1;
1296 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1297 sb
->max_dev
= cpu_to_le32(max_dev
);
1298 for (i
=0; i
<max_dev
;i
++)
1299 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1301 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1303 if (test_bit(Faulty
, &rdev2
->flags
))
1304 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1305 else if (test_bit(In_sync
, &rdev2
->flags
))
1306 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1307 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1308 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1310 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1313 sb
->sb_csum
= calc_sb_1_csum(sb
);
1316 static unsigned long long
1317 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1319 struct mdp_superblock_1
*sb
;
1320 sector_t max_sectors
;
1321 if (num_sectors
&& num_sectors
< rdev
->mddev
->size
* 2)
1322 return 0; /* component must fit device */
1323 if (rdev
->sb_start
< rdev
->data_offset
) {
1324 /* minor versions 1 and 2; superblock before data */
1325 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1326 max_sectors
-= rdev
->data_offset
;
1327 if (!num_sectors
|| num_sectors
> max_sectors
)
1328 num_sectors
= max_sectors
;
1329 } else if (rdev
->mddev
->bitmap_offset
) {
1330 /* minor version 0 with bitmap we can't move */
1333 /* minor version 0; superblock after data */
1335 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1336 sb_start
&= ~(sector_t
)(4*2 - 1);
1337 max_sectors
= rdev
->size
* 2 + sb_start
- rdev
->sb_start
;
1338 if (!num_sectors
|| num_sectors
> max_sectors
)
1339 num_sectors
= max_sectors
;
1340 rdev
->sb_start
= sb_start
;
1342 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1343 sb
->data_size
= cpu_to_le64(num_sectors
);
1344 sb
->super_offset
= rdev
->sb_start
;
1345 sb
->sb_csum
= calc_sb_1_csum(sb
);
1346 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1348 md_super_wait(rdev
->mddev
);
1349 return num_sectors
/ 2; /* kB for sysfs */
1352 static struct super_type super_types
[] = {
1355 .owner
= THIS_MODULE
,
1356 .load_super
= super_90_load
,
1357 .validate_super
= super_90_validate
,
1358 .sync_super
= super_90_sync
,
1359 .rdev_size_change
= super_90_rdev_size_change
,
1363 .owner
= THIS_MODULE
,
1364 .load_super
= super_1_load
,
1365 .validate_super
= super_1_validate
,
1366 .sync_super
= super_1_sync
,
1367 .rdev_size_change
= super_1_rdev_size_change
,
1371 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1373 mdk_rdev_t
*rdev
, *rdev2
;
1376 rdev_for_each_rcu(rdev
, mddev1
)
1377 rdev_for_each_rcu(rdev2
, mddev2
)
1378 if (rdev
->bdev
->bd_contains
==
1379 rdev2
->bdev
->bd_contains
) {
1387 static LIST_HEAD(pending_raid_disks
);
1389 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1391 char b
[BDEVNAME_SIZE
];
1401 /* prevent duplicates */
1402 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1405 /* make sure rdev->size exceeds mddev->size */
1406 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1408 /* Cannot change size, so fail
1409 * If mddev->level <= 0, then we don't care
1410 * about aligning sizes (e.g. linear)
1412 if (mddev
->level
> 0)
1415 mddev
->size
= rdev
->size
;
1418 /* Verify rdev->desc_nr is unique.
1419 * If it is -1, assign a free number, else
1420 * check number is not in use
1422 if (rdev
->desc_nr
< 0) {
1424 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1425 while (find_rdev_nr(mddev
, choice
))
1427 rdev
->desc_nr
= choice
;
1429 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1432 bdevname(rdev
->bdev
,b
);
1433 while ( (s
=strchr(b
, '/')) != NULL
)
1436 rdev
->mddev
= mddev
;
1437 printk(KERN_INFO
"md: bind<%s>\n", b
);
1439 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1442 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1443 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1444 kobject_del(&rdev
->kobj
);
1447 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1449 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1450 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1454 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1459 static void md_delayed_delete(struct work_struct
*ws
)
1461 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1462 kobject_del(&rdev
->kobj
);
1463 kobject_put(&rdev
->kobj
);
1466 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1468 char b
[BDEVNAME_SIZE
];
1473 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1474 list_del_rcu(&rdev
->same_set
);
1475 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1477 sysfs_remove_link(&rdev
->kobj
, "block");
1478 sysfs_put(rdev
->sysfs_state
);
1479 rdev
->sysfs_state
= NULL
;
1480 /* We need to delay this, otherwise we can deadlock when
1481 * writing to 'remove' to "dev/state". We also need
1482 * to delay it due to rcu usage.
1485 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1486 kobject_get(&rdev
->kobj
);
1487 schedule_work(&rdev
->del_work
);
1491 * prevent the device from being mounted, repartitioned or
1492 * otherwise reused by a RAID array (or any other kernel
1493 * subsystem), by bd_claiming the device.
1495 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1498 struct block_device
*bdev
;
1499 char b
[BDEVNAME_SIZE
];
1501 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1503 printk(KERN_ERR
"md: could not open %s.\n",
1504 __bdevname(dev
, b
));
1505 return PTR_ERR(bdev
);
1507 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1509 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1511 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1515 set_bit(AllReserved
, &rdev
->flags
);
1520 static void unlock_rdev(mdk_rdev_t
*rdev
)
1522 struct block_device
*bdev
= rdev
->bdev
;
1527 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1530 void md_autodetect_dev(dev_t dev
);
1532 static void export_rdev(mdk_rdev_t
* rdev
)
1534 char b
[BDEVNAME_SIZE
];
1535 printk(KERN_INFO
"md: export_rdev(%s)\n",
1536 bdevname(rdev
->bdev
,b
));
1541 if (test_bit(AutoDetected
, &rdev
->flags
))
1542 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1545 kobject_put(&rdev
->kobj
);
1548 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1550 unbind_rdev_from_array(rdev
);
1554 static void export_array(mddev_t
*mddev
)
1556 mdk_rdev_t
*rdev
, *tmp
;
1558 rdev_for_each(rdev
, tmp
, mddev
) {
1563 kick_rdev_from_array(rdev
);
1565 if (!list_empty(&mddev
->disks
))
1567 mddev
->raid_disks
= 0;
1568 mddev
->major_version
= 0;
1571 static void print_desc(mdp_disk_t
*desc
)
1573 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1574 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1577 static void print_sb_90(mdp_super_t
*sb
)
1582 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1583 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1584 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1586 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1587 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1588 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1589 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1590 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1591 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1592 sb
->failed_disks
, sb
->spare_disks
,
1593 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1596 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1599 desc
= sb
->disks
+ i
;
1600 if (desc
->number
|| desc
->major
|| desc
->minor
||
1601 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1602 printk(" D %2d: ", i
);
1606 printk(KERN_INFO
"md: THIS: ");
1607 print_desc(&sb
->this_disk
);
1610 static void print_sb_1(struct mdp_superblock_1
*sb
)
1614 uuid
= sb
->set_uuid
;
1615 printk(KERN_INFO
"md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1616 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1617 KERN_INFO
"md: Name: \"%s\" CT:%llu\n",
1618 le32_to_cpu(sb
->major_version
),
1619 le32_to_cpu(sb
->feature_map
),
1620 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1621 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1622 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1623 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1625 (unsigned long long)le64_to_cpu(sb
->ctime
)
1626 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1628 uuid
= sb
->device_uuid
;
1629 printk(KERN_INFO
"md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1631 KERN_INFO
"md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1632 ":%02x%02x%02x%02x%02x%02x\n"
1633 KERN_INFO
"md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1634 KERN_INFO
"md: (MaxDev:%u) \n",
1635 le32_to_cpu(sb
->level
),
1636 (unsigned long long)le64_to_cpu(sb
->size
),
1637 le32_to_cpu(sb
->raid_disks
),
1638 le32_to_cpu(sb
->layout
),
1639 le32_to_cpu(sb
->chunksize
),
1640 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1641 (unsigned long long)le64_to_cpu(sb
->data_size
),
1642 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1643 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1644 le32_to_cpu(sb
->dev_number
),
1645 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1646 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1647 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1648 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1650 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1651 (unsigned long long)le64_to_cpu(sb
->events
),
1652 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1653 le32_to_cpu(sb
->sb_csum
),
1654 le32_to_cpu(sb
->max_dev
)
1658 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1660 char b
[BDEVNAME_SIZE
];
1661 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1662 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1663 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1665 if (rdev
->sb_loaded
) {
1666 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1667 switch (major_version
) {
1669 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1672 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
1676 printk(KERN_INFO
"md: no rdev superblock!\n");
1679 static void md_print_devices(void)
1681 struct list_head
*tmp
;
1684 char b
[BDEVNAME_SIZE
];
1687 printk("md: **********************************\n");
1688 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1689 printk("md: **********************************\n");
1690 for_each_mddev(mddev
, tmp
) {
1693 bitmap_print_sb(mddev
->bitmap
);
1695 printk("%s: ", mdname(mddev
));
1696 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1697 printk("<%s>", bdevname(rdev
->bdev
,b
));
1700 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1701 print_rdev(rdev
, mddev
->major_version
);
1703 printk("md: **********************************\n");
1708 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1710 /* Update each superblock (in-memory image), but
1711 * if we are allowed to, skip spares which already
1712 * have the right event counter, or have one earlier
1713 * (which would mean they aren't being marked as dirty
1714 * with the rest of the array)
1718 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1719 if (rdev
->sb_events
== mddev
->events
||
1721 rdev
->raid_disk
< 0 &&
1722 (rdev
->sb_events
&1)==0 &&
1723 rdev
->sb_events
+1 == mddev
->events
)) {
1724 /* Don't update this superblock */
1725 rdev
->sb_loaded
= 2;
1727 super_types
[mddev
->major_version
].
1728 sync_super(mddev
, rdev
);
1729 rdev
->sb_loaded
= 1;
1734 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1740 if (mddev
->external
)
1743 spin_lock_irq(&mddev
->write_lock
);
1745 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1746 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1748 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1749 /* just a clean<-> dirty transition, possibly leave spares alone,
1750 * though if events isn't the right even/odd, we will have to do
1756 if (mddev
->degraded
)
1757 /* If the array is degraded, then skipping spares is both
1758 * dangerous and fairly pointless.
1759 * Dangerous because a device that was removed from the array
1760 * might have a event_count that still looks up-to-date,
1761 * so it can be re-added without a resync.
1762 * Pointless because if there are any spares to skip,
1763 * then a recovery will happen and soon that array won't
1764 * be degraded any more and the spare can go back to sleep then.
1768 sync_req
= mddev
->in_sync
;
1769 mddev
->utime
= get_seconds();
1771 /* If this is just a dirty<->clean transition, and the array is clean
1772 * and 'events' is odd, we can roll back to the previous clean state */
1774 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1775 && (mddev
->events
& 1)
1776 && mddev
->events
!= 1)
1779 /* otherwise we have to go forward and ... */
1781 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1782 /* .. if the array isn't clean, insist on an odd 'events' */
1783 if ((mddev
->events
&1)==0) {
1788 /* otherwise insist on an even 'events' (for clean states) */
1789 if ((mddev
->events
&1)) {
1796 if (!mddev
->events
) {
1798 * oops, this 64-bit counter should never wrap.
1799 * Either we are in around ~1 trillion A.C., assuming
1800 * 1 reboot per second, or we have a bug:
1807 * do not write anything to disk if using
1808 * nonpersistent superblocks
1810 if (!mddev
->persistent
) {
1811 if (!mddev
->external
)
1812 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1814 spin_unlock_irq(&mddev
->write_lock
);
1815 wake_up(&mddev
->sb_wait
);
1818 sync_sbs(mddev
, nospares
);
1819 spin_unlock_irq(&mddev
->write_lock
);
1822 "md: updating %s RAID superblock on device (in sync %d)\n",
1823 mdname(mddev
),mddev
->in_sync
);
1825 bitmap_update_sb(mddev
->bitmap
);
1826 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1827 char b
[BDEVNAME_SIZE
];
1828 dprintk(KERN_INFO
"md: ");
1829 if (rdev
->sb_loaded
!= 1)
1830 continue; /* no noise on spare devices */
1831 if (test_bit(Faulty
, &rdev
->flags
))
1832 dprintk("(skipping faulty ");
1834 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1835 if (!test_bit(Faulty
, &rdev
->flags
)) {
1836 md_super_write(mddev
,rdev
,
1837 rdev
->sb_start
, rdev
->sb_size
,
1839 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1840 bdevname(rdev
->bdev
,b
),
1841 (unsigned long long)rdev
->sb_start
);
1842 rdev
->sb_events
= mddev
->events
;
1846 if (mddev
->level
== LEVEL_MULTIPATH
)
1847 /* only need to write one superblock... */
1850 md_super_wait(mddev
);
1851 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1853 spin_lock_irq(&mddev
->write_lock
);
1854 if (mddev
->in_sync
!= sync_req
||
1855 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1856 /* have to write it out again */
1857 spin_unlock_irq(&mddev
->write_lock
);
1860 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1861 spin_unlock_irq(&mddev
->write_lock
);
1862 wake_up(&mddev
->sb_wait
);
1866 /* words written to sysfs files may, or may not, be \n terminated.
1867 * We want to accept with case. For this we use cmd_match.
1869 static int cmd_match(const char *cmd
, const char *str
)
1871 /* See if cmd, written into a sysfs file, matches
1872 * str. They must either be the same, or cmd can
1873 * have a trailing newline
1875 while (*cmd
&& *str
&& *cmd
== *str
) {
1886 struct rdev_sysfs_entry
{
1887 struct attribute attr
;
1888 ssize_t (*show
)(mdk_rdev_t
*, char *);
1889 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1893 state_show(mdk_rdev_t
*rdev
, char *page
)
1898 if (test_bit(Faulty
, &rdev
->flags
)) {
1899 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1902 if (test_bit(In_sync
, &rdev
->flags
)) {
1903 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1906 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1907 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1910 if (test_bit(Blocked
, &rdev
->flags
)) {
1911 len
+= sprintf(page
+len
, "%sblocked", sep
);
1914 if (!test_bit(Faulty
, &rdev
->flags
) &&
1915 !test_bit(In_sync
, &rdev
->flags
)) {
1916 len
+= sprintf(page
+len
, "%sspare", sep
);
1919 return len
+sprintf(page
+len
, "\n");
1923 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1926 * faulty - simulates and error
1927 * remove - disconnects the device
1928 * writemostly - sets write_mostly
1929 * -writemostly - clears write_mostly
1930 * blocked - sets the Blocked flag
1931 * -blocked - clears the Blocked flag
1934 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1935 md_error(rdev
->mddev
, rdev
);
1937 } else if (cmd_match(buf
, "remove")) {
1938 if (rdev
->raid_disk
>= 0)
1941 mddev_t
*mddev
= rdev
->mddev
;
1942 kick_rdev_from_array(rdev
);
1944 md_update_sb(mddev
, 1);
1945 md_new_event(mddev
);
1948 } else if (cmd_match(buf
, "writemostly")) {
1949 set_bit(WriteMostly
, &rdev
->flags
);
1951 } else if (cmd_match(buf
, "-writemostly")) {
1952 clear_bit(WriteMostly
, &rdev
->flags
);
1954 } else if (cmd_match(buf
, "blocked")) {
1955 set_bit(Blocked
, &rdev
->flags
);
1957 } else if (cmd_match(buf
, "-blocked")) {
1958 clear_bit(Blocked
, &rdev
->flags
);
1959 wake_up(&rdev
->blocked_wait
);
1960 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
1961 md_wakeup_thread(rdev
->mddev
->thread
);
1965 if (!err
&& rdev
->sysfs_state
)
1966 sysfs_notify_dirent(rdev
->sysfs_state
);
1967 return err
? err
: len
;
1969 static struct rdev_sysfs_entry rdev_state
=
1970 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1973 errors_show(mdk_rdev_t
*rdev
, char *page
)
1975 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1979 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1982 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1983 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1984 atomic_set(&rdev
->corrected_errors
, n
);
1989 static struct rdev_sysfs_entry rdev_errors
=
1990 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1993 slot_show(mdk_rdev_t
*rdev
, char *page
)
1995 if (rdev
->raid_disk
< 0)
1996 return sprintf(page
, "none\n");
1998 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2002 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2007 int slot
= simple_strtoul(buf
, &e
, 10);
2008 if (strncmp(buf
, "none", 4)==0)
2010 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2012 if (rdev
->mddev
->pers
&& slot
== -1) {
2013 /* Setting 'slot' on an active array requires also
2014 * updating the 'rd%d' link, and communicating
2015 * with the personality with ->hot_*_disk.
2016 * For now we only support removing
2017 * failed/spare devices. This normally happens automatically,
2018 * but not when the metadata is externally managed.
2020 if (rdev
->raid_disk
== -1)
2022 /* personality does all needed checks */
2023 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2025 err
= rdev
->mddev
->pers
->
2026 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2029 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2030 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2031 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2032 md_wakeup_thread(rdev
->mddev
->thread
);
2033 } else if (rdev
->mddev
->pers
) {
2035 /* Activating a spare .. or possibly reactivating
2036 * if we every get bitmaps working here.
2039 if (rdev
->raid_disk
!= -1)
2042 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2045 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2046 if (rdev2
->raid_disk
== slot
)
2049 rdev
->raid_disk
= slot
;
2050 if (test_bit(In_sync
, &rdev
->flags
))
2051 rdev
->saved_raid_disk
= slot
;
2053 rdev
->saved_raid_disk
= -1;
2054 err
= rdev
->mddev
->pers
->
2055 hot_add_disk(rdev
->mddev
, rdev
);
2057 rdev
->raid_disk
= -1;
2060 sysfs_notify_dirent(rdev
->sysfs_state
);
2061 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2062 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2064 "md: cannot register "
2066 nm
, mdname(rdev
->mddev
));
2068 /* don't wakeup anyone, leave that to userspace. */
2070 if (slot
>= rdev
->mddev
->raid_disks
)
2072 rdev
->raid_disk
= slot
;
2073 /* assume it is working */
2074 clear_bit(Faulty
, &rdev
->flags
);
2075 clear_bit(WriteMostly
, &rdev
->flags
);
2076 set_bit(In_sync
, &rdev
->flags
);
2077 sysfs_notify_dirent(rdev
->sysfs_state
);
2083 static struct rdev_sysfs_entry rdev_slot
=
2084 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2087 offset_show(mdk_rdev_t
*rdev
, char *page
)
2089 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2093 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2096 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2097 if (e
==buf
|| (*e
&& *e
!= '\n'))
2099 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2101 if (rdev
->size
&& rdev
->mddev
->external
)
2102 /* Must set offset before size, so overlap checks
2105 rdev
->data_offset
= offset
;
2109 static struct rdev_sysfs_entry rdev_offset
=
2110 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2113 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2115 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
2118 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2120 /* check if two start/length pairs overlap */
2129 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2131 unsigned long long size
;
2132 unsigned long long oldsize
= rdev
->size
;
2133 mddev_t
*my_mddev
= rdev
->mddev
;
2135 if (strict_strtoull(buf
, 10, &size
) < 0)
2137 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2138 if (my_mddev
->persistent
) {
2139 size
= super_types
[my_mddev
->major_version
].
2140 rdev_size_change(rdev
, size
* 2);
2144 size
= (rdev
->bdev
->bd_inode
->i_size
>> 10);
2145 size
-= rdev
->data_offset
/2;
2148 if (size
< my_mddev
->size
)
2149 return -EINVAL
; /* component must fit device */
2152 if (size
> oldsize
&& my_mddev
->external
) {
2153 /* need to check that all other rdevs with the same ->bdev
2154 * do not overlap. We need to unlock the mddev to avoid
2155 * a deadlock. We have already changed rdev->size, and if
2156 * we have to change it back, we will have the lock again.
2160 struct list_head
*tmp
;
2162 mddev_unlock(my_mddev
);
2163 for_each_mddev(mddev
, tmp
) {
2167 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2168 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2169 (rdev
->bdev
== rdev2
->bdev
&&
2171 overlaps(rdev
->data_offset
, rdev
->size
* 2,
2173 rdev2
->size
* 2))) {
2177 mddev_unlock(mddev
);
2183 mddev_lock(my_mddev
);
2185 /* Someone else could have slipped in a size
2186 * change here, but doing so is just silly.
2187 * We put oldsize back because we *know* it is
2188 * safe, and trust userspace not to race with
2191 rdev
->size
= oldsize
;
2198 static struct rdev_sysfs_entry rdev_size
=
2199 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2201 static struct attribute
*rdev_default_attrs
[] = {
2210 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2212 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2213 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2214 mddev_t
*mddev
= rdev
->mddev
;
2220 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2222 if (rdev
->mddev
== NULL
)
2225 rv
= entry
->show(rdev
, page
);
2226 mddev_unlock(mddev
);
2232 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2233 const char *page
, size_t length
)
2235 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2236 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2238 mddev_t
*mddev
= rdev
->mddev
;
2242 if (!capable(CAP_SYS_ADMIN
))
2244 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2246 if (rdev
->mddev
== NULL
)
2249 rv
= entry
->store(rdev
, page
, length
);
2250 mddev_unlock(mddev
);
2255 static void rdev_free(struct kobject
*ko
)
2257 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2260 static struct sysfs_ops rdev_sysfs_ops
= {
2261 .show
= rdev_attr_show
,
2262 .store
= rdev_attr_store
,
2264 static struct kobj_type rdev_ktype
= {
2265 .release
= rdev_free
,
2266 .sysfs_ops
= &rdev_sysfs_ops
,
2267 .default_attrs
= rdev_default_attrs
,
2271 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2273 * mark the device faulty if:
2275 * - the device is nonexistent (zero size)
2276 * - the device has no valid superblock
2278 * a faulty rdev _never_ has rdev->sb set.
2280 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2282 char b
[BDEVNAME_SIZE
];
2287 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2289 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2290 return ERR_PTR(-ENOMEM
);
2293 if ((err
= alloc_disk_sb(rdev
)))
2296 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2300 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2303 rdev
->saved_raid_disk
= -1;
2304 rdev
->raid_disk
= -1;
2306 rdev
->data_offset
= 0;
2307 rdev
->sb_events
= 0;
2308 atomic_set(&rdev
->nr_pending
, 0);
2309 atomic_set(&rdev
->read_errors
, 0);
2310 atomic_set(&rdev
->corrected_errors
, 0);
2312 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2315 "md: %s has zero or unknown size, marking faulty!\n",
2316 bdevname(rdev
->bdev
,b
));
2321 if (super_format
>= 0) {
2322 err
= super_types
[super_format
].
2323 load_super(rdev
, NULL
, super_minor
);
2324 if (err
== -EINVAL
) {
2326 "md: %s does not have a valid v%d.%d "
2327 "superblock, not importing!\n",
2328 bdevname(rdev
->bdev
,b
),
2329 super_format
, super_minor
);
2334 "md: could not read %s's sb, not importing!\n",
2335 bdevname(rdev
->bdev
,b
));
2340 INIT_LIST_HEAD(&rdev
->same_set
);
2341 init_waitqueue_head(&rdev
->blocked_wait
);
2346 if (rdev
->sb_page
) {
2352 return ERR_PTR(err
);
2356 * Check a full RAID array for plausibility
2360 static void analyze_sbs(mddev_t
* mddev
)
2363 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2364 char b
[BDEVNAME_SIZE
];
2367 rdev_for_each(rdev
, tmp
, mddev
)
2368 switch (super_types
[mddev
->major_version
].
2369 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2377 "md: fatal superblock inconsistency in %s"
2378 " -- removing from array\n",
2379 bdevname(rdev
->bdev
,b
));
2380 kick_rdev_from_array(rdev
);
2384 super_types
[mddev
->major_version
].
2385 validate_super(mddev
, freshest
);
2388 rdev_for_each(rdev
, tmp
, mddev
) {
2389 if (rdev
!= freshest
)
2390 if (super_types
[mddev
->major_version
].
2391 validate_super(mddev
, rdev
)) {
2392 printk(KERN_WARNING
"md: kicking non-fresh %s"
2394 bdevname(rdev
->bdev
,b
));
2395 kick_rdev_from_array(rdev
);
2398 if (mddev
->level
== LEVEL_MULTIPATH
) {
2399 rdev
->desc_nr
= i
++;
2400 rdev
->raid_disk
= rdev
->desc_nr
;
2401 set_bit(In_sync
, &rdev
->flags
);
2402 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2403 rdev
->raid_disk
= -1;
2404 clear_bit(In_sync
, &rdev
->flags
);
2410 if (mddev
->recovery_cp
!= MaxSector
&&
2412 printk(KERN_ERR
"md: %s: raid array is not clean"
2413 " -- starting background reconstruction\n",
2418 static void md_safemode_timeout(unsigned long data
);
2421 safe_delay_show(mddev_t
*mddev
, char *page
)
2423 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2424 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2427 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2435 /* remove a period, and count digits after it */
2436 if (len
>= sizeof(buf
))
2438 strlcpy(buf
, cbuf
, sizeof(buf
));
2439 for (i
=0; i
<len
; i
++) {
2441 if (isdigit(buf
[i
])) {
2446 } else if (buf
[i
] == '.') {
2451 if (strict_strtoul(buf
, 10, &msec
) < 0)
2453 msec
= (msec
* 1000) / scale
;
2455 mddev
->safemode_delay
= 0;
2457 unsigned long old_delay
= mddev
->safemode_delay
;
2458 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2459 if (mddev
->safemode_delay
== 0)
2460 mddev
->safemode_delay
= 1;
2461 if (mddev
->safemode_delay
< old_delay
)
2462 md_safemode_timeout((unsigned long)mddev
);
2466 static struct md_sysfs_entry md_safe_delay
=
2467 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2470 level_show(mddev_t
*mddev
, char *page
)
2472 struct mdk_personality
*p
= mddev
->pers
;
2474 return sprintf(page
, "%s\n", p
->name
);
2475 else if (mddev
->clevel
[0])
2476 return sprintf(page
, "%s\n", mddev
->clevel
);
2477 else if (mddev
->level
!= LEVEL_NONE
)
2478 return sprintf(page
, "%d\n", mddev
->level
);
2484 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2491 if (len
>= sizeof(mddev
->clevel
))
2493 strncpy(mddev
->clevel
, buf
, len
);
2494 if (mddev
->clevel
[len
-1] == '\n')
2496 mddev
->clevel
[len
] = 0;
2497 mddev
->level
= LEVEL_NONE
;
2501 static struct md_sysfs_entry md_level
=
2502 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2506 layout_show(mddev_t
*mddev
, char *page
)
2508 /* just a number, not meaningful for all levels */
2509 if (mddev
->reshape_position
!= MaxSector
&&
2510 mddev
->layout
!= mddev
->new_layout
)
2511 return sprintf(page
, "%d (%d)\n",
2512 mddev
->new_layout
, mddev
->layout
);
2513 return sprintf(page
, "%d\n", mddev
->layout
);
2517 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2520 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2522 if (!*buf
|| (*e
&& *e
!= '\n'))
2527 if (mddev
->reshape_position
!= MaxSector
)
2528 mddev
->new_layout
= n
;
2533 static struct md_sysfs_entry md_layout
=
2534 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2538 raid_disks_show(mddev_t
*mddev
, char *page
)
2540 if (mddev
->raid_disks
== 0)
2542 if (mddev
->reshape_position
!= MaxSector
&&
2543 mddev
->delta_disks
!= 0)
2544 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2545 mddev
->raid_disks
- mddev
->delta_disks
);
2546 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2549 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2552 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2556 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2558 if (!*buf
|| (*e
&& *e
!= '\n'))
2562 rv
= update_raid_disks(mddev
, n
);
2563 else if (mddev
->reshape_position
!= MaxSector
) {
2564 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2565 mddev
->delta_disks
= n
- olddisks
;
2566 mddev
->raid_disks
= n
;
2568 mddev
->raid_disks
= n
;
2569 return rv
? rv
: len
;
2571 static struct md_sysfs_entry md_raid_disks
=
2572 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2575 chunk_size_show(mddev_t
*mddev
, char *page
)
2577 if (mddev
->reshape_position
!= MaxSector
&&
2578 mddev
->chunk_size
!= mddev
->new_chunk
)
2579 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2581 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2585 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2587 /* can only set chunk_size if array is not yet active */
2589 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2591 if (!*buf
|| (*e
&& *e
!= '\n'))
2596 else if (mddev
->reshape_position
!= MaxSector
)
2597 mddev
->new_chunk
= n
;
2599 mddev
->chunk_size
= n
;
2602 static struct md_sysfs_entry md_chunk_size
=
2603 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2606 resync_start_show(mddev_t
*mddev
, char *page
)
2608 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2612 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2615 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2619 if (!*buf
|| (*e
&& *e
!= '\n'))
2622 mddev
->recovery_cp
= n
;
2625 static struct md_sysfs_entry md_resync_start
=
2626 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2629 * The array state can be:
2632 * No devices, no size, no level
2633 * Equivalent to STOP_ARRAY ioctl
2635 * May have some settings, but array is not active
2636 * all IO results in error
2637 * When written, doesn't tear down array, but just stops it
2638 * suspended (not supported yet)
2639 * All IO requests will block. The array can be reconfigured.
2640 * Writing this, if accepted, will block until array is quiescent
2642 * no resync can happen. no superblocks get written.
2643 * write requests fail
2645 * like readonly, but behaves like 'clean' on a write request.
2647 * clean - no pending writes, but otherwise active.
2648 * When written to inactive array, starts without resync
2649 * If a write request arrives then
2650 * if metadata is known, mark 'dirty' and switch to 'active'.
2651 * if not known, block and switch to write-pending
2652 * If written to an active array that has pending writes, then fails.
2654 * fully active: IO and resync can be happening.
2655 * When written to inactive array, starts with resync
2658 * clean, but writes are blocked waiting for 'active' to be written.
2661 * like active, but no writes have been seen for a while (100msec).
2664 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2665 write_pending
, active_idle
, bad_word
};
2666 static char *array_states
[] = {
2667 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2668 "write-pending", "active-idle", NULL
};
2670 static int match_word(const char *word
, char **list
)
2673 for (n
=0; list
[n
]; n
++)
2674 if (cmd_match(word
, list
[n
]))
2680 array_state_show(mddev_t
*mddev
, char *page
)
2682 enum array_state st
= inactive
;
2695 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2697 else if (mddev
->safemode
)
2703 if (list_empty(&mddev
->disks
) &&
2704 mddev
->raid_disks
== 0 &&
2710 return sprintf(page
, "%s\n", array_states
[st
]);
2713 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2714 static int do_md_run(mddev_t
* mddev
);
2715 static int restart_array(mddev_t
*mddev
);
2718 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2721 enum array_state st
= match_word(buf
, array_states
);
2726 /* stopping an active array */
2727 if (atomic_read(&mddev
->openers
) > 0)
2729 err
= do_md_stop(mddev
, 0, 0);
2732 /* stopping an active array */
2734 if (atomic_read(&mddev
->openers
) > 0)
2736 err
= do_md_stop(mddev
, 2, 0);
2738 err
= 0; /* already inactive */
2741 break; /* not supported yet */
2744 err
= do_md_stop(mddev
, 1, 0);
2747 set_disk_ro(mddev
->gendisk
, 1);
2748 err
= do_md_run(mddev
);
2754 err
= do_md_stop(mddev
, 1, 0);
2755 else if (mddev
->ro
== 1)
2756 err
= restart_array(mddev
);
2759 set_disk_ro(mddev
->gendisk
, 0);
2763 err
= do_md_run(mddev
);
2768 restart_array(mddev
);
2769 spin_lock_irq(&mddev
->write_lock
);
2770 if (atomic_read(&mddev
->writes_pending
) == 0) {
2771 if (mddev
->in_sync
== 0) {
2773 if (mddev
->safemode
== 1)
2774 mddev
->safemode
= 0;
2775 if (mddev
->persistent
)
2776 set_bit(MD_CHANGE_CLEAN
,
2782 spin_unlock_irq(&mddev
->write_lock
);
2785 mddev
->recovery_cp
= MaxSector
;
2786 err
= do_md_run(mddev
);
2791 restart_array(mddev
);
2792 if (mddev
->external
)
2793 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2794 wake_up(&mddev
->sb_wait
);
2798 set_disk_ro(mddev
->gendisk
, 0);
2799 err
= do_md_run(mddev
);
2804 /* these cannot be set */
2810 sysfs_notify_dirent(mddev
->sysfs_state
);
2814 static struct md_sysfs_entry md_array_state
=
2815 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2818 null_show(mddev_t
*mddev
, char *page
)
2824 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2826 /* buf must be %d:%d\n? giving major and minor numbers */
2827 /* The new device is added to the array.
2828 * If the array has a persistent superblock, we read the
2829 * superblock to initialise info and check validity.
2830 * Otherwise, only checking done is that in bind_rdev_to_array,
2831 * which mainly checks size.
2834 int major
= simple_strtoul(buf
, &e
, 10);
2840 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2842 minor
= simple_strtoul(e
+1, &e
, 10);
2843 if (*e
&& *e
!= '\n')
2845 dev
= MKDEV(major
, minor
);
2846 if (major
!= MAJOR(dev
) ||
2847 minor
!= MINOR(dev
))
2851 if (mddev
->persistent
) {
2852 rdev
= md_import_device(dev
, mddev
->major_version
,
2853 mddev
->minor_version
);
2854 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2855 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2856 mdk_rdev_t
, same_set
);
2857 err
= super_types
[mddev
->major_version
]
2858 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2862 } else if (mddev
->external
)
2863 rdev
= md_import_device(dev
, -2, -1);
2865 rdev
= md_import_device(dev
, -1, -1);
2868 return PTR_ERR(rdev
);
2869 err
= bind_rdev_to_array(rdev
, mddev
);
2873 return err
? err
: len
;
2876 static struct md_sysfs_entry md_new_device
=
2877 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2880 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2883 unsigned long chunk
, end_chunk
;
2887 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2889 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2890 if (buf
== end
) break;
2891 if (*end
== '-') { /* range */
2893 end_chunk
= simple_strtoul(buf
, &end
, 0);
2894 if (buf
== end
) break;
2896 if (*end
&& !isspace(*end
)) break;
2897 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2899 while (isspace(*buf
)) buf
++;
2901 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2906 static struct md_sysfs_entry md_bitmap
=
2907 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2910 size_show(mddev_t
*mddev
, char *page
)
2912 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2915 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
2918 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2920 /* If array is inactive, we can reduce the component size, but
2921 * not increase it (except from 0).
2922 * If array is active, we can try an on-line resize
2926 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2927 if (!*buf
|| *buf
== '\n' ||
2932 err
= update_size(mddev
, size
* 2);
2933 md_update_sb(mddev
, 1);
2935 if (mddev
->size
== 0 ||
2941 return err
? err
: len
;
2944 static struct md_sysfs_entry md_size
=
2945 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2950 * 'none' for arrays with no metadata (good luck...)
2951 * 'external' for arrays with externally managed metadata,
2952 * or N.M for internally known formats
2955 metadata_show(mddev_t
*mddev
, char *page
)
2957 if (mddev
->persistent
)
2958 return sprintf(page
, "%d.%d\n",
2959 mddev
->major_version
, mddev
->minor_version
);
2960 else if (mddev
->external
)
2961 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
2963 return sprintf(page
, "none\n");
2967 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2971 /* Changing the details of 'external' metadata is
2972 * always permitted. Otherwise there must be
2973 * no devices attached to the array.
2975 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
2977 else if (!list_empty(&mddev
->disks
))
2980 if (cmd_match(buf
, "none")) {
2981 mddev
->persistent
= 0;
2982 mddev
->external
= 0;
2983 mddev
->major_version
= 0;
2984 mddev
->minor_version
= 90;
2987 if (strncmp(buf
, "external:", 9) == 0) {
2988 size_t namelen
= len
-9;
2989 if (namelen
>= sizeof(mddev
->metadata_type
))
2990 namelen
= sizeof(mddev
->metadata_type
)-1;
2991 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
2992 mddev
->metadata_type
[namelen
] = 0;
2993 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
2994 mddev
->metadata_type
[--namelen
] = 0;
2995 mddev
->persistent
= 0;
2996 mddev
->external
= 1;
2997 mddev
->major_version
= 0;
2998 mddev
->minor_version
= 90;
3001 major
= simple_strtoul(buf
, &e
, 10);
3002 if (e
==buf
|| *e
!= '.')
3005 minor
= simple_strtoul(buf
, &e
, 10);
3006 if (e
==buf
|| (*e
&& *e
!= '\n') )
3008 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3010 mddev
->major_version
= major
;
3011 mddev
->minor_version
= minor
;
3012 mddev
->persistent
= 1;
3013 mddev
->external
= 0;
3017 static struct md_sysfs_entry md_metadata
=
3018 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3021 action_show(mddev_t
*mddev
, char *page
)
3023 char *type
= "idle";
3024 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3025 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3026 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3028 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3029 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3031 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3035 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3038 return sprintf(page
, "%s\n", type
);
3042 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3044 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3047 if (cmd_match(page
, "idle")) {
3048 if (mddev
->sync_thread
) {
3049 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3050 md_unregister_thread(mddev
->sync_thread
);
3051 mddev
->sync_thread
= NULL
;
3052 mddev
->recovery
= 0;
3054 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3055 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3057 else if (cmd_match(page
, "resync"))
3058 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3059 else if (cmd_match(page
, "recover")) {
3060 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3061 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3062 } else if (cmd_match(page
, "reshape")) {
3064 if (mddev
->pers
->start_reshape
== NULL
)
3066 err
= mddev
->pers
->start_reshape(mddev
);
3069 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3071 if (cmd_match(page
, "check"))
3072 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3073 else if (!cmd_match(page
, "repair"))
3075 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3076 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3078 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3079 md_wakeup_thread(mddev
->thread
);
3080 sysfs_notify_dirent(mddev
->sysfs_action
);
3085 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3087 return sprintf(page
, "%llu\n",
3088 (unsigned long long) mddev
->resync_mismatches
);
3091 static struct md_sysfs_entry md_scan_mode
=
3092 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3095 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3098 sync_min_show(mddev_t
*mddev
, char *page
)
3100 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3101 mddev
->sync_speed_min
? "local": "system");
3105 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3109 if (strncmp(buf
, "system", 6)==0) {
3110 mddev
->sync_speed_min
= 0;
3113 min
= simple_strtoul(buf
, &e
, 10);
3114 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3116 mddev
->sync_speed_min
= min
;
3120 static struct md_sysfs_entry md_sync_min
=
3121 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3124 sync_max_show(mddev_t
*mddev
, char *page
)
3126 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3127 mddev
->sync_speed_max
? "local": "system");
3131 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3135 if (strncmp(buf
, "system", 6)==0) {
3136 mddev
->sync_speed_max
= 0;
3139 max
= simple_strtoul(buf
, &e
, 10);
3140 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3142 mddev
->sync_speed_max
= max
;
3146 static struct md_sysfs_entry md_sync_max
=
3147 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3150 degraded_show(mddev_t
*mddev
, char *page
)
3152 return sprintf(page
, "%d\n", mddev
->degraded
);
3154 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3157 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3159 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3163 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3167 if (strict_strtol(buf
, 10, &n
))
3170 if (n
!= 0 && n
!= 1)
3173 mddev
->parallel_resync
= n
;
3175 if (mddev
->sync_thread
)
3176 wake_up(&resync_wait
);
3181 /* force parallel resync, even with shared block devices */
3182 static struct md_sysfs_entry md_sync_force_parallel
=
3183 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3184 sync_force_parallel_show
, sync_force_parallel_store
);
3187 sync_speed_show(mddev_t
*mddev
, char *page
)
3189 unsigned long resync
, dt
, db
;
3190 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3191 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3193 db
= resync
- mddev
->resync_mark_cnt
;
3194 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3197 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3200 sync_completed_show(mddev_t
*mddev
, char *page
)
3202 unsigned long max_blocks
, resync
;
3204 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3205 max_blocks
= mddev
->resync_max_sectors
;
3207 max_blocks
= mddev
->size
<< 1;
3209 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3210 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
3213 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3216 min_sync_show(mddev_t
*mddev
, char *page
)
3218 return sprintf(page
, "%llu\n",
3219 (unsigned long long)mddev
->resync_min
);
3222 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3224 unsigned long long min
;
3225 if (strict_strtoull(buf
, 10, &min
))
3227 if (min
> mddev
->resync_max
)
3229 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3232 /* Must be a multiple of chunk_size */
3233 if (mddev
->chunk_size
) {
3234 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3237 mddev
->resync_min
= min
;
3242 static struct md_sysfs_entry md_min_sync
=
3243 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3246 max_sync_show(mddev_t
*mddev
, char *page
)
3248 if (mddev
->resync_max
== MaxSector
)
3249 return sprintf(page
, "max\n");
3251 return sprintf(page
, "%llu\n",
3252 (unsigned long long)mddev
->resync_max
);
3255 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3257 if (strncmp(buf
, "max", 3) == 0)
3258 mddev
->resync_max
= MaxSector
;
3260 unsigned long long max
;
3261 if (strict_strtoull(buf
, 10, &max
))
3263 if (max
< mddev
->resync_min
)
3265 if (max
< mddev
->resync_max
&&
3266 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3269 /* Must be a multiple of chunk_size */
3270 if (mddev
->chunk_size
) {
3271 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3274 mddev
->resync_max
= max
;
3276 wake_up(&mddev
->recovery_wait
);
3280 static struct md_sysfs_entry md_max_sync
=
3281 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3284 suspend_lo_show(mddev_t
*mddev
, char *page
)
3286 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3290 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3293 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3295 if (mddev
->pers
->quiesce
== NULL
)
3297 if (buf
== e
|| (*e
&& *e
!= '\n'))
3299 if (new >= mddev
->suspend_hi
||
3300 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3301 mddev
->suspend_lo
= new;
3302 mddev
->pers
->quiesce(mddev
, 2);
3307 static struct md_sysfs_entry md_suspend_lo
=
3308 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3312 suspend_hi_show(mddev_t
*mddev
, char *page
)
3314 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3318 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3321 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3323 if (mddev
->pers
->quiesce
== NULL
)
3325 if (buf
== e
|| (*e
&& *e
!= '\n'))
3327 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3328 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3329 mddev
->suspend_hi
= new;
3330 mddev
->pers
->quiesce(mddev
, 1);
3331 mddev
->pers
->quiesce(mddev
, 0);
3336 static struct md_sysfs_entry md_suspend_hi
=
3337 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3340 reshape_position_show(mddev_t
*mddev
, char *page
)
3342 if (mddev
->reshape_position
!= MaxSector
)
3343 return sprintf(page
, "%llu\n",
3344 (unsigned long long)mddev
->reshape_position
);
3345 strcpy(page
, "none\n");
3350 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3353 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3356 if (buf
== e
|| (*e
&& *e
!= '\n'))
3358 mddev
->reshape_position
= new;
3359 mddev
->delta_disks
= 0;
3360 mddev
->new_level
= mddev
->level
;
3361 mddev
->new_layout
= mddev
->layout
;
3362 mddev
->new_chunk
= mddev
->chunk_size
;
3366 static struct md_sysfs_entry md_reshape_position
=
3367 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3368 reshape_position_store
);
3371 static struct attribute
*md_default_attrs
[] = {
3374 &md_raid_disks
.attr
,
3375 &md_chunk_size
.attr
,
3377 &md_resync_start
.attr
,
3379 &md_new_device
.attr
,
3380 &md_safe_delay
.attr
,
3381 &md_array_state
.attr
,
3382 &md_reshape_position
.attr
,
3386 static struct attribute
*md_redundancy_attrs
[] = {
3388 &md_mismatches
.attr
,
3391 &md_sync_speed
.attr
,
3392 &md_sync_force_parallel
.attr
,
3393 &md_sync_completed
.attr
,
3396 &md_suspend_lo
.attr
,
3397 &md_suspend_hi
.attr
,
3402 static struct attribute_group md_redundancy_group
= {
3404 .attrs
= md_redundancy_attrs
,
3409 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3411 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3412 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3417 rv
= mddev_lock(mddev
);
3419 rv
= entry
->show(mddev
, page
);
3420 mddev_unlock(mddev
);
3426 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3427 const char *page
, size_t length
)
3429 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3430 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3435 if (!capable(CAP_SYS_ADMIN
))
3437 rv
= mddev_lock(mddev
);
3439 rv
= entry
->store(mddev
, page
, length
);
3440 mddev_unlock(mddev
);
3445 static void md_free(struct kobject
*ko
)
3447 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3449 if (mddev
->sysfs_state
)
3450 sysfs_put(mddev
->sysfs_state
);
3452 if (mddev
->gendisk
) {
3453 del_gendisk(mddev
->gendisk
);
3454 put_disk(mddev
->gendisk
);
3457 blk_cleanup_queue(mddev
->queue
);
3462 static struct sysfs_ops md_sysfs_ops
= {
3463 .show
= md_attr_show
,
3464 .store
= md_attr_store
,
3466 static struct kobj_type md_ktype
= {
3468 .sysfs_ops
= &md_sysfs_ops
,
3469 .default_attrs
= md_default_attrs
,
3474 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3476 static DEFINE_MUTEX(disks_mutex
);
3477 mddev_t
*mddev
= mddev_find(dev
);
3478 struct gendisk
*disk
;
3479 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
3480 int shift
= partitioned
? MdpMinorShift
: 0;
3481 int unit
= MINOR(dev
) >> shift
;
3487 mutex_lock(&disks_mutex
);
3488 if (mddev
->gendisk
) {
3489 mutex_unlock(&disks_mutex
);
3494 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
3495 if (!mddev
->queue
) {
3496 mutex_unlock(&disks_mutex
);
3500 /* Can be unlocked because the queue is new: no concurrency */
3501 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
3503 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3505 disk
= alloc_disk(1 << shift
);
3507 mutex_unlock(&disks_mutex
);
3508 blk_cleanup_queue(mddev
->queue
);
3509 mddev
->queue
= NULL
;
3513 disk
->major
= MAJOR(dev
);
3514 disk
->first_minor
= unit
<< shift
;
3516 sprintf(disk
->disk_name
, "md_d%d", unit
);
3518 sprintf(disk
->disk_name
, "md%d", unit
);
3519 disk
->fops
= &md_fops
;
3520 disk
->private_data
= mddev
;
3521 disk
->queue
= mddev
->queue
;
3522 /* Allow extended partitions. This makes the
3523 * 'mdp' device redundant, but we can really
3526 disk
->flags
|= GENHD_FL_EXT_DEVT
;
3528 mddev
->gendisk
= disk
;
3529 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3530 &disk_to_dev(disk
)->kobj
, "%s", "md");
3531 mutex_unlock(&disks_mutex
);
3533 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3536 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3537 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
3542 static void md_safemode_timeout(unsigned long data
)
3544 mddev_t
*mddev
= (mddev_t
*) data
;
3546 if (!atomic_read(&mddev
->writes_pending
)) {
3547 mddev
->safemode
= 1;
3548 if (mddev
->external
)
3549 sysfs_notify_dirent(mddev
->sysfs_state
);
3551 md_wakeup_thread(mddev
->thread
);
3554 static int start_dirty_degraded
;
3556 static int do_md_run(mddev_t
* mddev
)
3561 struct gendisk
*disk
;
3562 struct mdk_personality
*pers
;
3563 char b
[BDEVNAME_SIZE
];
3565 if (list_empty(&mddev
->disks
))
3566 /* cannot run an array with no devices.. */
3573 * Analyze all RAID superblock(s)
3575 if (!mddev
->raid_disks
) {
3576 if (!mddev
->persistent
)
3581 chunk_size
= mddev
->chunk_size
;
3584 if (chunk_size
> MAX_CHUNK_SIZE
) {
3585 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3586 chunk_size
, MAX_CHUNK_SIZE
);
3590 * chunk-size has to be a power of 2
3592 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3593 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3597 /* devices must have minimum size of one chunk */
3598 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3599 if (test_bit(Faulty
, &rdev
->flags
))
3601 if (rdev
->size
< chunk_size
/ 1024) {
3603 "md: Dev %s smaller than chunk_size:"
3605 bdevname(rdev
->bdev
,b
),
3606 (unsigned long long)rdev
->size
,
3613 if (mddev
->level
!= LEVEL_NONE
)
3614 request_module("md-level-%d", mddev
->level
);
3615 else if (mddev
->clevel
[0])
3616 request_module("md-%s", mddev
->clevel
);
3619 * Drop all container device buffers, from now on
3620 * the only valid external interface is through the md
3623 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3624 if (test_bit(Faulty
, &rdev
->flags
))
3626 sync_blockdev(rdev
->bdev
);
3627 invalidate_bdev(rdev
->bdev
);
3629 /* perform some consistency tests on the device.
3630 * We don't want the data to overlap the metadata,
3631 * Internal Bitmap issues has handled elsewhere.
3633 if (rdev
->data_offset
< rdev
->sb_start
) {
3635 rdev
->data_offset
+ mddev
->size
*2
3637 printk("md: %s: data overlaps metadata\n",
3642 if (rdev
->sb_start
+ rdev
->sb_size
/512
3643 > rdev
->data_offset
) {
3644 printk("md: %s: metadata overlaps data\n",
3649 sysfs_notify_dirent(rdev
->sysfs_state
);
3652 md_probe(mddev
->unit
, NULL
, NULL
);
3653 disk
= mddev
->gendisk
;
3657 spin_lock(&pers_lock
);
3658 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3659 if (!pers
|| !try_module_get(pers
->owner
)) {
3660 spin_unlock(&pers_lock
);
3661 if (mddev
->level
!= LEVEL_NONE
)
3662 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3665 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3670 spin_unlock(&pers_lock
);
3671 mddev
->level
= pers
->level
;
3672 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3674 if (mddev
->reshape_position
!= MaxSector
&&
3675 pers
->start_reshape
== NULL
) {
3676 /* This personality cannot handle reshaping... */
3678 module_put(pers
->owner
);
3682 if (pers
->sync_request
) {
3683 /* Warn if this is a potentially silly
3686 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3690 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3691 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
3693 rdev
->bdev
->bd_contains
==
3694 rdev2
->bdev
->bd_contains
) {
3696 "%s: WARNING: %s appears to be"
3697 " on the same physical disk as"
3700 bdevname(rdev
->bdev
,b
),
3701 bdevname(rdev2
->bdev
,b2
));
3708 "True protection against single-disk"
3709 " failure might be compromised.\n");
3712 mddev
->recovery
= 0;
3713 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3714 mddev
->barriers_work
= 1;
3715 mddev
->ok_start_degraded
= start_dirty_degraded
;
3718 mddev
->ro
= 2; /* read-only, but switch on first write */
3720 err
= mddev
->pers
->run(mddev
);
3722 printk(KERN_ERR
"md: pers->run() failed ...\n");
3723 else if (mddev
->pers
->sync_request
) {
3724 err
= bitmap_create(mddev
);
3726 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3727 mdname(mddev
), err
);
3728 mddev
->pers
->stop(mddev
);
3732 module_put(mddev
->pers
->owner
);
3734 bitmap_destroy(mddev
);
3737 if (mddev
->pers
->sync_request
) {
3738 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3740 "md: cannot register extra attributes for %s\n",
3742 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3743 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3746 atomic_set(&mddev
->writes_pending
,0);
3747 mddev
->safemode
= 0;
3748 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3749 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3750 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3753 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3754 if (rdev
->raid_disk
>= 0) {
3756 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3757 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3758 printk("md: cannot register %s for %s\n",
3762 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3765 md_update_sb(mddev
, 0);
3767 set_capacity(disk
, mddev
->array_sectors
);
3769 /* If we call blk_queue_make_request here, it will
3770 * re-initialise max_sectors etc which may have been
3771 * refined inside -> run. So just set the bits we need to set.
3772 * Most initialisation happended when we called
3773 * blk_queue_make_request(..., md_fail_request)
3776 mddev
->queue
->queuedata
= mddev
;
3777 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3779 /* If there is a partially-recovered drive we need to
3780 * start recovery here. If we leave it to md_check_recovery,
3781 * it will remove the drives and not do the right thing
3783 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3785 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3786 if (rdev
->raid_disk
>= 0 &&
3787 !test_bit(In_sync
, &rdev
->flags
) &&
3788 !test_bit(Faulty
, &rdev
->flags
))
3789 /* complete an interrupted recovery */
3791 if (spares
&& mddev
->pers
->sync_request
) {
3792 mddev
->recovery
= 0;
3793 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3794 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3797 if (!mddev
->sync_thread
) {
3798 printk(KERN_ERR
"%s: could not start resync"
3801 /* leave the spares where they are, it shouldn't hurt */
3802 mddev
->recovery
= 0;
3806 md_wakeup_thread(mddev
->thread
);
3807 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3810 md_new_event(mddev
);
3811 sysfs_notify_dirent(mddev
->sysfs_state
);
3812 if (mddev
->sysfs_action
)
3813 sysfs_notify_dirent(mddev
->sysfs_action
);
3814 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3815 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
3819 static int restart_array(mddev_t
*mddev
)
3821 struct gendisk
*disk
= mddev
->gendisk
;
3823 /* Complain if it has no devices */
3824 if (list_empty(&mddev
->disks
))
3830 mddev
->safemode
= 0;
3832 set_disk_ro(disk
, 0);
3833 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3835 /* Kick recovery or resync if necessary */
3836 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3837 md_wakeup_thread(mddev
->thread
);
3838 md_wakeup_thread(mddev
->sync_thread
);
3839 sysfs_notify_dirent(mddev
->sysfs_state
);
3843 /* similar to deny_write_access, but accounts for our holding a reference
3844 * to the file ourselves */
3845 static int deny_bitmap_write_access(struct file
* file
)
3847 struct inode
*inode
= file
->f_mapping
->host
;
3849 spin_lock(&inode
->i_lock
);
3850 if (atomic_read(&inode
->i_writecount
) > 1) {
3851 spin_unlock(&inode
->i_lock
);
3854 atomic_set(&inode
->i_writecount
, -1);
3855 spin_unlock(&inode
->i_lock
);
3860 static void restore_bitmap_write_access(struct file
*file
)
3862 struct inode
*inode
= file
->f_mapping
->host
;
3864 spin_lock(&inode
->i_lock
);
3865 atomic_set(&inode
->i_writecount
, 1);
3866 spin_unlock(&inode
->i_lock
);
3870 * 0 - completely stop and dis-assemble array
3871 * 1 - switch to readonly
3872 * 2 - stop but do not disassemble array
3874 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
3877 struct gendisk
*disk
= mddev
->gendisk
;
3879 if (atomic_read(&mddev
->openers
) > is_open
) {
3880 printk("md: %s still in use.\n",mdname(mddev
));
3886 if (mddev
->sync_thread
) {
3887 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3888 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3889 md_unregister_thread(mddev
->sync_thread
);
3890 mddev
->sync_thread
= NULL
;
3893 del_timer_sync(&mddev
->safemode_timer
);
3896 case 1: /* readonly */
3902 case 0: /* disassemble */
3904 bitmap_flush(mddev
);
3905 md_super_wait(mddev
);
3907 set_disk_ro(disk
, 0);
3908 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3909 mddev
->pers
->stop(mddev
);
3910 mddev
->queue
->merge_bvec_fn
= NULL
;
3911 mddev
->queue
->unplug_fn
= NULL
;
3912 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
3913 if (mddev
->pers
->sync_request
) {
3914 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3915 if (mddev
->sysfs_action
)
3916 sysfs_put(mddev
->sysfs_action
);
3917 mddev
->sysfs_action
= NULL
;
3919 module_put(mddev
->pers
->owner
);
3921 /* tell userspace to handle 'inactive' */
3922 sysfs_notify_dirent(mddev
->sysfs_state
);
3924 set_capacity(disk
, 0);
3930 if (!mddev
->in_sync
|| mddev
->flags
) {
3931 /* mark array as shutdown cleanly */
3933 md_update_sb(mddev
, 1);
3936 set_disk_ro(disk
, 1);
3937 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3941 * Free resources if final stop
3946 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3948 bitmap_destroy(mddev
);
3949 if (mddev
->bitmap_file
) {
3950 restore_bitmap_write_access(mddev
->bitmap_file
);
3951 fput(mddev
->bitmap_file
);
3952 mddev
->bitmap_file
= NULL
;
3954 mddev
->bitmap_offset
= 0;
3956 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3957 if (rdev
->raid_disk
>= 0) {
3959 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3960 sysfs_remove_link(&mddev
->kobj
, nm
);
3963 /* make sure all md_delayed_delete calls have finished */
3964 flush_scheduled_work();
3966 export_array(mddev
);
3968 mddev
->array_sectors
= 0;
3970 mddev
->raid_disks
= 0;
3971 mddev
->recovery_cp
= 0;
3972 mddev
->resync_min
= 0;
3973 mddev
->resync_max
= MaxSector
;
3974 mddev
->reshape_position
= MaxSector
;
3975 mddev
->external
= 0;
3976 mddev
->persistent
= 0;
3977 mddev
->level
= LEVEL_NONE
;
3978 mddev
->clevel
[0] = 0;
3981 mddev
->metadata_type
[0] = 0;
3982 mddev
->chunk_size
= 0;
3983 mddev
->ctime
= mddev
->utime
= 0;
3985 mddev
->max_disks
= 0;
3987 mddev
->delta_disks
= 0;
3988 mddev
->new_level
= LEVEL_NONE
;
3989 mddev
->new_layout
= 0;
3990 mddev
->new_chunk
= 0;
3991 mddev
->curr_resync
= 0;
3992 mddev
->resync_mismatches
= 0;
3993 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
3994 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
3995 mddev
->recovery
= 0;
3998 mddev
->degraded
= 0;
3999 mddev
->barriers_work
= 0;
4000 mddev
->safemode
= 0;
4001 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4003 } else if (mddev
->pers
)
4004 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
4007 md_new_event(mddev
);
4008 sysfs_notify_dirent(mddev
->sysfs_state
);
4014 static void autorun_array(mddev_t
*mddev
)
4019 if (list_empty(&mddev
->disks
))
4022 printk(KERN_INFO
"md: running: ");
4024 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4025 char b
[BDEVNAME_SIZE
];
4026 printk("<%s>", bdevname(rdev
->bdev
,b
));
4030 err
= do_md_run(mddev
);
4032 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4033 do_md_stop(mddev
, 0, 0);
4038 * lets try to run arrays based on all disks that have arrived
4039 * until now. (those are in pending_raid_disks)
4041 * the method: pick the first pending disk, collect all disks with
4042 * the same UUID, remove all from the pending list and put them into
4043 * the 'same_array' list. Then order this list based on superblock
4044 * update time (freshest comes first), kick out 'old' disks and
4045 * compare superblocks. If everything's fine then run it.
4047 * If "unit" is allocated, then bump its reference count
4049 static void autorun_devices(int part
)
4051 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4053 char b
[BDEVNAME_SIZE
];
4055 printk(KERN_INFO
"md: autorun ...\n");
4056 while (!list_empty(&pending_raid_disks
)) {
4059 LIST_HEAD(candidates
);
4060 rdev0
= list_entry(pending_raid_disks
.next
,
4061 mdk_rdev_t
, same_set
);
4063 printk(KERN_INFO
"md: considering %s ...\n",
4064 bdevname(rdev0
->bdev
,b
));
4065 INIT_LIST_HEAD(&candidates
);
4066 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4067 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4068 printk(KERN_INFO
"md: adding %s ...\n",
4069 bdevname(rdev
->bdev
,b
));
4070 list_move(&rdev
->same_set
, &candidates
);
4073 * now we have a set of devices, with all of them having
4074 * mostly sane superblocks. It's time to allocate the
4078 dev
= MKDEV(mdp_major
,
4079 rdev0
->preferred_minor
<< MdpMinorShift
);
4080 unit
= MINOR(dev
) >> MdpMinorShift
;
4082 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4085 if (rdev0
->preferred_minor
!= unit
) {
4086 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4087 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4091 md_probe(dev
, NULL
, NULL
);
4092 mddev
= mddev_find(dev
);
4093 if (!mddev
|| !mddev
->gendisk
) {
4097 "md: cannot allocate memory for md drive.\n");
4100 if (mddev_lock(mddev
))
4101 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4103 else if (mddev
->raid_disks
|| mddev
->major_version
4104 || !list_empty(&mddev
->disks
)) {
4106 "md: %s already running, cannot run %s\n",
4107 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4108 mddev_unlock(mddev
);
4110 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4111 mddev
->persistent
= 1;
4112 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4113 list_del_init(&rdev
->same_set
);
4114 if (bind_rdev_to_array(rdev
, mddev
))
4117 autorun_array(mddev
);
4118 mddev_unlock(mddev
);
4120 /* on success, candidates will be empty, on error
4123 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4124 list_del_init(&rdev
->same_set
);
4129 printk(KERN_INFO
"md: ... autorun DONE.\n");
4131 #endif /* !MODULE */
4133 static int get_version(void __user
* arg
)
4137 ver
.major
= MD_MAJOR_VERSION
;
4138 ver
.minor
= MD_MINOR_VERSION
;
4139 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4141 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4147 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4149 mdu_array_info_t info
;
4150 int nr
,working
,active
,failed
,spare
;
4153 nr
=working
=active
=failed
=spare
=0;
4154 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4156 if (test_bit(Faulty
, &rdev
->flags
))
4160 if (test_bit(In_sync
, &rdev
->flags
))
4167 info
.major_version
= mddev
->major_version
;
4168 info
.minor_version
= mddev
->minor_version
;
4169 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4170 info
.ctime
= mddev
->ctime
;
4171 info
.level
= mddev
->level
;
4172 info
.size
= mddev
->size
;
4173 if (info
.size
!= mddev
->size
) /* overflow */
4176 info
.raid_disks
= mddev
->raid_disks
;
4177 info
.md_minor
= mddev
->md_minor
;
4178 info
.not_persistent
= !mddev
->persistent
;
4180 info
.utime
= mddev
->utime
;
4183 info
.state
= (1<<MD_SB_CLEAN
);
4184 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4185 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4186 info
.active_disks
= active
;
4187 info
.working_disks
= working
;
4188 info
.failed_disks
= failed
;
4189 info
.spare_disks
= spare
;
4191 info
.layout
= mddev
->layout
;
4192 info
.chunk_size
= mddev
->chunk_size
;
4194 if (copy_to_user(arg
, &info
, sizeof(info
)))
4200 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4202 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4203 char *ptr
, *buf
= NULL
;
4206 if (md_allow_write(mddev
))
4207 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4209 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4214 /* bitmap disabled, zero the first byte and copy out */
4215 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4216 file
->pathname
[0] = '\0';
4220 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4224 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4228 strcpy(file
->pathname
, ptr
);
4232 if (copy_to_user(arg
, file
, sizeof(*file
)))
4240 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4242 mdu_disk_info_t info
;
4245 if (copy_from_user(&info
, arg
, sizeof(info
)))
4248 rdev
= find_rdev_nr(mddev
, info
.number
);
4250 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4251 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4252 info
.raid_disk
= rdev
->raid_disk
;
4254 if (test_bit(Faulty
, &rdev
->flags
))
4255 info
.state
|= (1<<MD_DISK_FAULTY
);
4256 else if (test_bit(In_sync
, &rdev
->flags
)) {
4257 info
.state
|= (1<<MD_DISK_ACTIVE
);
4258 info
.state
|= (1<<MD_DISK_SYNC
);
4260 if (test_bit(WriteMostly
, &rdev
->flags
))
4261 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4263 info
.major
= info
.minor
= 0;
4264 info
.raid_disk
= -1;
4265 info
.state
= (1<<MD_DISK_REMOVED
);
4268 if (copy_to_user(arg
, &info
, sizeof(info
)))
4274 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4276 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4278 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4280 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4283 if (!mddev
->raid_disks
) {
4285 /* expecting a device which has a superblock */
4286 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4289 "md: md_import_device returned %ld\n",
4291 return PTR_ERR(rdev
);
4293 if (!list_empty(&mddev
->disks
)) {
4294 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4295 mdk_rdev_t
, same_set
);
4296 int err
= super_types
[mddev
->major_version
]
4297 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4300 "md: %s has different UUID to %s\n",
4301 bdevname(rdev
->bdev
,b
),
4302 bdevname(rdev0
->bdev
,b2
));
4307 err
= bind_rdev_to_array(rdev
, mddev
);
4314 * add_new_disk can be used once the array is assembled
4315 * to add "hot spares". They must already have a superblock
4320 if (!mddev
->pers
->hot_add_disk
) {
4322 "%s: personality does not support diskops!\n",
4326 if (mddev
->persistent
)
4327 rdev
= md_import_device(dev
, mddev
->major_version
,
4328 mddev
->minor_version
);
4330 rdev
= md_import_device(dev
, -1, -1);
4333 "md: md_import_device returned %ld\n",
4335 return PTR_ERR(rdev
);
4337 /* set save_raid_disk if appropriate */
4338 if (!mddev
->persistent
) {
4339 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4340 info
->raid_disk
< mddev
->raid_disks
)
4341 rdev
->raid_disk
= info
->raid_disk
;
4343 rdev
->raid_disk
= -1;
4345 super_types
[mddev
->major_version
].
4346 validate_super(mddev
, rdev
);
4347 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4349 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4350 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4351 set_bit(WriteMostly
, &rdev
->flags
);
4353 rdev
->raid_disk
= -1;
4354 err
= bind_rdev_to_array(rdev
, mddev
);
4355 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4356 /* If there is hot_add_disk but no hot_remove_disk
4357 * then added disks for geometry changes,
4358 * and should be added immediately.
4360 super_types
[mddev
->major_version
].
4361 validate_super(mddev
, rdev
);
4362 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4364 unbind_rdev_from_array(rdev
);
4369 sysfs_notify_dirent(rdev
->sysfs_state
);
4371 md_update_sb(mddev
, 1);
4372 if (mddev
->degraded
)
4373 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4374 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4375 md_wakeup_thread(mddev
->thread
);
4379 /* otherwise, add_new_disk is only allowed
4380 * for major_version==0 superblocks
4382 if (mddev
->major_version
!= 0) {
4383 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4388 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4390 rdev
= md_import_device(dev
, -1, 0);
4393 "md: error, md_import_device() returned %ld\n",
4395 return PTR_ERR(rdev
);
4397 rdev
->desc_nr
= info
->number
;
4398 if (info
->raid_disk
< mddev
->raid_disks
)
4399 rdev
->raid_disk
= info
->raid_disk
;
4401 rdev
->raid_disk
= -1;
4403 if (rdev
->raid_disk
< mddev
->raid_disks
)
4404 if (info
->state
& (1<<MD_DISK_SYNC
))
4405 set_bit(In_sync
, &rdev
->flags
);
4407 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4408 set_bit(WriteMostly
, &rdev
->flags
);
4410 if (!mddev
->persistent
) {
4411 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4412 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4414 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4415 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4417 err
= bind_rdev_to_array(rdev
, mddev
);
4427 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4429 char b
[BDEVNAME_SIZE
];
4432 rdev
= find_rdev(mddev
, dev
);
4436 if (rdev
->raid_disk
>= 0)
4439 kick_rdev_from_array(rdev
);
4440 md_update_sb(mddev
, 1);
4441 md_new_event(mddev
);
4445 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4446 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4450 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4452 char b
[BDEVNAME_SIZE
];
4459 if (mddev
->major_version
!= 0) {
4460 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4461 " version-0 superblocks.\n",
4465 if (!mddev
->pers
->hot_add_disk
) {
4467 "%s: personality does not support diskops!\n",
4472 rdev
= md_import_device(dev
, -1, 0);
4475 "md: error, md_import_device() returned %ld\n",
4480 if (mddev
->persistent
)
4481 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4483 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4485 rdev
->size
= calc_num_sectors(rdev
, mddev
->chunk_size
) / 2;
4487 if (test_bit(Faulty
, &rdev
->flags
)) {
4489 "md: can not hot-add faulty %s disk to %s!\n",
4490 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4494 clear_bit(In_sync
, &rdev
->flags
);
4496 rdev
->saved_raid_disk
= -1;
4497 err
= bind_rdev_to_array(rdev
, mddev
);
4502 * The rest should better be atomic, we can have disk failures
4503 * noticed in interrupt contexts ...
4506 if (rdev
->desc_nr
== mddev
->max_disks
) {
4507 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
4510 goto abort_unbind_export
;
4513 rdev
->raid_disk
= -1;
4515 md_update_sb(mddev
, 1);
4518 * Kick recovery, maybe this spare has to be added to the
4519 * array immediately.
4521 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4522 md_wakeup_thread(mddev
->thread
);
4523 md_new_event(mddev
);
4526 abort_unbind_export
:
4527 unbind_rdev_from_array(rdev
);
4534 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4539 if (!mddev
->pers
->quiesce
)
4541 if (mddev
->recovery
|| mddev
->sync_thread
)
4543 /* we should be able to change the bitmap.. */
4549 return -EEXIST
; /* cannot add when bitmap is present */
4550 mddev
->bitmap_file
= fget(fd
);
4552 if (mddev
->bitmap_file
== NULL
) {
4553 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4558 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4560 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4562 fput(mddev
->bitmap_file
);
4563 mddev
->bitmap_file
= NULL
;
4566 mddev
->bitmap_offset
= 0; /* file overrides offset */
4567 } else if (mddev
->bitmap
== NULL
)
4568 return -ENOENT
; /* cannot remove what isn't there */
4571 mddev
->pers
->quiesce(mddev
, 1);
4573 err
= bitmap_create(mddev
);
4574 if (fd
< 0 || err
) {
4575 bitmap_destroy(mddev
);
4576 fd
= -1; /* make sure to put the file */
4578 mddev
->pers
->quiesce(mddev
, 0);
4581 if (mddev
->bitmap_file
) {
4582 restore_bitmap_write_access(mddev
->bitmap_file
);
4583 fput(mddev
->bitmap_file
);
4585 mddev
->bitmap_file
= NULL
;
4592 * set_array_info is used two different ways
4593 * The original usage is when creating a new array.
4594 * In this usage, raid_disks is > 0 and it together with
4595 * level, size, not_persistent,layout,chunksize determine the
4596 * shape of the array.
4597 * This will always create an array with a type-0.90.0 superblock.
4598 * The newer usage is when assembling an array.
4599 * In this case raid_disks will be 0, and the major_version field is
4600 * use to determine which style super-blocks are to be found on the devices.
4601 * The minor and patch _version numbers are also kept incase the
4602 * super_block handler wishes to interpret them.
4604 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
4607 if (info
->raid_disks
== 0) {
4608 /* just setting version number for superblock loading */
4609 if (info
->major_version
< 0 ||
4610 info
->major_version
>= ARRAY_SIZE(super_types
) ||
4611 super_types
[info
->major_version
].name
== NULL
) {
4612 /* maybe try to auto-load a module? */
4614 "md: superblock version %d not known\n",
4615 info
->major_version
);
4618 mddev
->major_version
= info
->major_version
;
4619 mddev
->minor_version
= info
->minor_version
;
4620 mddev
->patch_version
= info
->patch_version
;
4621 mddev
->persistent
= !info
->not_persistent
;
4624 mddev
->major_version
= MD_MAJOR_VERSION
;
4625 mddev
->minor_version
= MD_MINOR_VERSION
;
4626 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
4627 mddev
->ctime
= get_seconds();
4629 mddev
->level
= info
->level
;
4630 mddev
->clevel
[0] = 0;
4631 mddev
->size
= info
->size
;
4632 mddev
->raid_disks
= info
->raid_disks
;
4633 /* don't set md_minor, it is determined by which /dev/md* was
4636 if (info
->state
& (1<<MD_SB_CLEAN
))
4637 mddev
->recovery_cp
= MaxSector
;
4639 mddev
->recovery_cp
= 0;
4640 mddev
->persistent
= ! info
->not_persistent
;
4641 mddev
->external
= 0;
4643 mddev
->layout
= info
->layout
;
4644 mddev
->chunk_size
= info
->chunk_size
;
4646 mddev
->max_disks
= MD_SB_DISKS
;
4648 if (mddev
->persistent
)
4650 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
4652 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
4653 mddev
->bitmap_offset
= 0;
4655 mddev
->reshape_position
= MaxSector
;
4658 * Generate a 128 bit UUID
4660 get_random_bytes(mddev
->uuid
, 16);
4662 mddev
->new_level
= mddev
->level
;
4663 mddev
->new_chunk
= mddev
->chunk_size
;
4664 mddev
->new_layout
= mddev
->layout
;
4665 mddev
->delta_disks
= 0;
4670 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
4674 int fit
= (num_sectors
== 0);
4676 if (mddev
->pers
->resize
== NULL
)
4678 /* The "num_sectors" is the number of sectors of each device that
4679 * is used. This can only make sense for arrays with redundancy.
4680 * linear and raid0 always use whatever space is available. We can only
4681 * consider changing this number if no resync or reconstruction is
4682 * happening, and if the new size is acceptable. It must fit before the
4683 * sb_start or, if that is <data_offset, it must fit before the size
4684 * of each device. If num_sectors is zero, we find the largest size
4688 if (mddev
->sync_thread
)
4691 /* Sorry, cannot grow a bitmap yet, just remove it,
4695 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4697 avail
= rdev
->size
* 2;
4699 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
4700 num_sectors
= avail
;
4701 if (avail
< num_sectors
)
4704 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
4706 struct block_device
*bdev
;
4708 bdev
= bdget_disk(mddev
->gendisk
, 0);
4710 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4711 i_size_write(bdev
->bd_inode
,
4712 (loff_t
)mddev
->array_sectors
<< 9);
4713 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4720 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4723 /* change the number of raid disks */
4724 if (mddev
->pers
->check_reshape
== NULL
)
4726 if (raid_disks
<= 0 ||
4727 raid_disks
>= mddev
->max_disks
)
4729 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4731 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4733 rv
= mddev
->pers
->check_reshape(mddev
);
4739 * update_array_info is used to change the configuration of an
4741 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4742 * fields in the info are checked against the array.
4743 * Any differences that cannot be handled will cause an error.
4744 * Normally, only one change can be managed at a time.
4746 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4752 /* calculate expected state,ignoring low bits */
4753 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4754 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4756 if (mddev
->major_version
!= info
->major_version
||
4757 mddev
->minor_version
!= info
->minor_version
||
4758 /* mddev->patch_version != info->patch_version || */
4759 mddev
->ctime
!= info
->ctime
||
4760 mddev
->level
!= info
->level
||
4761 /* mddev->layout != info->layout || */
4762 !mddev
->persistent
!= info
->not_persistent
||
4763 mddev
->chunk_size
!= info
->chunk_size
||
4764 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4765 ((state
^info
->state
) & 0xfffffe00)
4768 /* Check there is only one change */
4769 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4770 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4771 if (mddev
->layout
!= info
->layout
) cnt
++;
4772 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4773 if (cnt
== 0) return 0;
4774 if (cnt
> 1) return -EINVAL
;
4776 if (mddev
->layout
!= info
->layout
) {
4778 * we don't need to do anything at the md level, the
4779 * personality will take care of it all.
4781 if (mddev
->pers
->reconfig
== NULL
)
4784 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4786 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4787 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
4789 if (mddev
->raid_disks
!= info
->raid_disks
)
4790 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4792 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4793 if (mddev
->pers
->quiesce
== NULL
)
4795 if (mddev
->recovery
|| mddev
->sync_thread
)
4797 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4798 /* add the bitmap */
4801 if (mddev
->default_bitmap_offset
== 0)
4803 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4804 mddev
->pers
->quiesce(mddev
, 1);
4805 rv
= bitmap_create(mddev
);
4807 bitmap_destroy(mddev
);
4808 mddev
->pers
->quiesce(mddev
, 0);
4810 /* remove the bitmap */
4813 if (mddev
->bitmap
->file
)
4815 mddev
->pers
->quiesce(mddev
, 1);
4816 bitmap_destroy(mddev
);
4817 mddev
->pers
->quiesce(mddev
, 0);
4818 mddev
->bitmap_offset
= 0;
4821 md_update_sb(mddev
, 1);
4825 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4829 if (mddev
->pers
== NULL
)
4832 rdev
= find_rdev(mddev
, dev
);
4836 md_error(mddev
, rdev
);
4841 * We have a problem here : there is no easy way to give a CHS
4842 * virtual geometry. We currently pretend that we have a 2 heads
4843 * 4 sectors (with a BIG number of cylinders...). This drives
4844 * dosfs just mad... ;-)
4846 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4848 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4852 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4856 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
4857 unsigned int cmd
, unsigned long arg
)
4860 void __user
*argp
= (void __user
*)arg
;
4861 mddev_t
*mddev
= NULL
;
4863 if (!capable(CAP_SYS_ADMIN
))
4867 * Commands dealing with the RAID driver but not any
4873 err
= get_version(argp
);
4876 case PRINT_RAID_DEBUG
:
4884 autostart_arrays(arg
);
4891 * Commands creating/starting a new array:
4894 mddev
= bdev
->bd_disk
->private_data
;
4901 err
= mddev_lock(mddev
);
4904 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4911 case SET_ARRAY_INFO
:
4913 mdu_array_info_t info
;
4915 memset(&info
, 0, sizeof(info
));
4916 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4921 err
= update_array_info(mddev
, &info
);
4923 printk(KERN_WARNING
"md: couldn't update"
4924 " array info. %d\n", err
);
4929 if (!list_empty(&mddev
->disks
)) {
4931 "md: array %s already has disks!\n",
4936 if (mddev
->raid_disks
) {
4938 "md: array %s already initialised!\n",
4943 err
= set_array_info(mddev
, &info
);
4945 printk(KERN_WARNING
"md: couldn't set"
4946 " array info. %d\n", err
);
4956 * Commands querying/configuring an existing array:
4958 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4959 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4960 if ((!mddev
->raid_disks
&& !mddev
->external
)
4961 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4962 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
4963 && cmd
!= GET_BITMAP_FILE
) {
4969 * Commands even a read-only array can execute:
4973 case GET_ARRAY_INFO
:
4974 err
= get_array_info(mddev
, argp
);
4977 case GET_BITMAP_FILE
:
4978 err
= get_bitmap_file(mddev
, argp
);
4982 err
= get_disk_info(mddev
, argp
);
4985 case RESTART_ARRAY_RW
:
4986 err
= restart_array(mddev
);
4990 err
= do_md_stop(mddev
, 0, 1);
4994 err
= do_md_stop(mddev
, 1, 1);
5000 * The remaining ioctls are changing the state of the
5001 * superblock, so we do not allow them on read-only arrays.
5002 * However non-MD ioctls (e.g. get-size) will still come through
5003 * here and hit the 'default' below, so only disallow
5004 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5006 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5007 if (mddev
->ro
== 2) {
5009 sysfs_notify_dirent(mddev
->sysfs_state
);
5010 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5011 md_wakeup_thread(mddev
->thread
);
5022 mdu_disk_info_t info
;
5023 if (copy_from_user(&info
, argp
, sizeof(info
)))
5026 err
= add_new_disk(mddev
, &info
);
5030 case HOT_REMOVE_DISK
:
5031 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5035 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5038 case SET_DISK_FAULTY
:
5039 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5043 err
= do_md_run(mddev
);
5046 case SET_BITMAP_FILE
:
5047 err
= set_bitmap_file(mddev
, (int)arg
);
5057 mddev_unlock(mddev
);
5067 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5070 * Succeed if we can lock the mddev, which confirms that
5071 * it isn't being stopped right now.
5073 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5076 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5081 atomic_inc(&mddev
->openers
);
5082 mddev_unlock(mddev
);
5084 check_disk_change(bdev
);
5089 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5091 mddev_t
*mddev
= disk
->private_data
;
5094 atomic_dec(&mddev
->openers
);
5100 static int md_media_changed(struct gendisk
*disk
)
5102 mddev_t
*mddev
= disk
->private_data
;
5104 return mddev
->changed
;
5107 static int md_revalidate(struct gendisk
*disk
)
5109 mddev_t
*mddev
= disk
->private_data
;
5114 static struct block_device_operations md_fops
=
5116 .owner
= THIS_MODULE
,
5118 .release
= md_release
,
5119 .locked_ioctl
= md_ioctl
,
5120 .getgeo
= md_getgeo
,
5121 .media_changed
= md_media_changed
,
5122 .revalidate_disk
= md_revalidate
,
5125 static int md_thread(void * arg
)
5127 mdk_thread_t
*thread
= arg
;
5130 * md_thread is a 'system-thread', it's priority should be very
5131 * high. We avoid resource deadlocks individually in each
5132 * raid personality. (RAID5 does preallocation) We also use RR and
5133 * the very same RT priority as kswapd, thus we will never get
5134 * into a priority inversion deadlock.
5136 * we definitely have to have equal or higher priority than
5137 * bdflush, otherwise bdflush will deadlock if there are too
5138 * many dirty RAID5 blocks.
5141 allow_signal(SIGKILL
);
5142 while (!kthread_should_stop()) {
5144 /* We need to wait INTERRUPTIBLE so that
5145 * we don't add to the load-average.
5146 * That means we need to be sure no signals are
5149 if (signal_pending(current
))
5150 flush_signals(current
);
5152 wait_event_interruptible_timeout
5154 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5155 || kthread_should_stop(),
5158 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5160 thread
->run(thread
->mddev
);
5166 void md_wakeup_thread(mdk_thread_t
*thread
)
5169 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5170 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5171 wake_up(&thread
->wqueue
);
5175 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5178 mdk_thread_t
*thread
;
5180 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5184 init_waitqueue_head(&thread
->wqueue
);
5187 thread
->mddev
= mddev
;
5188 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5189 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5190 if (IS_ERR(thread
->tsk
)) {
5197 void md_unregister_thread(mdk_thread_t
*thread
)
5199 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5201 kthread_stop(thread
->tsk
);
5205 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5212 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5215 if (mddev
->external
)
5216 set_bit(Blocked
, &rdev
->flags
);
5218 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5220 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5221 __builtin_return_address(0),__builtin_return_address(1),
5222 __builtin_return_address(2),__builtin_return_address(3));
5226 if (!mddev
->pers
->error_handler
)
5228 mddev
->pers
->error_handler(mddev
,rdev
);
5229 if (mddev
->degraded
)
5230 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5231 set_bit(StateChanged
, &rdev
->flags
);
5232 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5233 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5234 md_wakeup_thread(mddev
->thread
);
5235 md_new_event_inintr(mddev
);
5238 /* seq_file implementation /proc/mdstat */
5240 static void status_unused(struct seq_file
*seq
)
5245 seq_printf(seq
, "unused devices: ");
5247 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5248 char b
[BDEVNAME_SIZE
];
5250 seq_printf(seq
, "%s ",
5251 bdevname(rdev
->bdev
,b
));
5254 seq_printf(seq
, "<none>");
5256 seq_printf(seq
, "\n");
5260 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5262 sector_t max_blocks
, resync
, res
;
5263 unsigned long dt
, db
, rt
;
5265 unsigned int per_milli
;
5267 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5269 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5270 max_blocks
= mddev
->resync_max_sectors
>> 1;
5272 max_blocks
= mddev
->size
;
5275 * Should not happen.
5281 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5282 * in a sector_t, and (max_blocks>>scale) will fit in a
5283 * u32, as those are the requirements for sector_div.
5284 * Thus 'scale' must be at least 10
5287 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5288 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5291 res
= (resync
>>scale
)*1000;
5292 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5296 int i
, x
= per_milli
/50, y
= 20-x
;
5297 seq_printf(seq
, "[");
5298 for (i
= 0; i
< x
; i
++)
5299 seq_printf(seq
, "=");
5300 seq_printf(seq
, ">");
5301 for (i
= 0; i
< y
; i
++)
5302 seq_printf(seq
, ".");
5303 seq_printf(seq
, "] ");
5305 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5306 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5308 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5310 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5311 "resync" : "recovery"))),
5312 per_milli
/10, per_milli
% 10,
5313 (unsigned long long) resync
,
5314 (unsigned long long) max_blocks
);
5317 * We do not want to overflow, so the order of operands and
5318 * the * 100 / 100 trick are important. We do a +1 to be
5319 * safe against division by zero. We only estimate anyway.
5321 * dt: time from mark until now
5322 * db: blocks written from mark until now
5323 * rt: remaining time
5325 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5327 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5328 - mddev
->resync_mark_cnt
;
5329 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5331 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5333 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5336 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5338 struct list_head
*tmp
;
5348 spin_lock(&all_mddevs_lock
);
5349 list_for_each(tmp
,&all_mddevs
)
5351 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5353 spin_unlock(&all_mddevs_lock
);
5356 spin_unlock(&all_mddevs_lock
);
5358 return (void*)2;/* tail */
5362 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5364 struct list_head
*tmp
;
5365 mddev_t
*next_mddev
, *mddev
= v
;
5371 spin_lock(&all_mddevs_lock
);
5373 tmp
= all_mddevs
.next
;
5375 tmp
= mddev
->all_mddevs
.next
;
5376 if (tmp
!= &all_mddevs
)
5377 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5379 next_mddev
= (void*)2;
5382 spin_unlock(&all_mddevs_lock
);
5390 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5394 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5398 struct mdstat_info
{
5402 static int md_seq_show(struct seq_file
*seq
, void *v
)
5407 struct mdstat_info
*mi
= seq
->private;
5408 struct bitmap
*bitmap
;
5410 if (v
== (void*)1) {
5411 struct mdk_personality
*pers
;
5412 seq_printf(seq
, "Personalities : ");
5413 spin_lock(&pers_lock
);
5414 list_for_each_entry(pers
, &pers_list
, list
)
5415 seq_printf(seq
, "[%s] ", pers
->name
);
5417 spin_unlock(&pers_lock
);
5418 seq_printf(seq
, "\n");
5419 mi
->event
= atomic_read(&md_event_count
);
5422 if (v
== (void*)2) {
5427 if (mddev_lock(mddev
) < 0)
5430 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5431 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5432 mddev
->pers
? "" : "in");
5435 seq_printf(seq
, " (read-only)");
5437 seq_printf(seq
, " (auto-read-only)");
5438 seq_printf(seq
, " %s", mddev
->pers
->name
);
5442 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5443 char b
[BDEVNAME_SIZE
];
5444 seq_printf(seq
, " %s[%d]",
5445 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5446 if (test_bit(WriteMostly
, &rdev
->flags
))
5447 seq_printf(seq
, "(W)");
5448 if (test_bit(Faulty
, &rdev
->flags
)) {
5449 seq_printf(seq
, "(F)");
5451 } else if (rdev
->raid_disk
< 0)
5452 seq_printf(seq
, "(S)"); /* spare */
5456 if (!list_empty(&mddev
->disks
)) {
5458 seq_printf(seq
, "\n %llu blocks",
5459 (unsigned long long)
5460 mddev
->array_sectors
/ 2);
5462 seq_printf(seq
, "\n %llu blocks",
5463 (unsigned long long)size
);
5465 if (mddev
->persistent
) {
5466 if (mddev
->major_version
!= 0 ||
5467 mddev
->minor_version
!= 90) {
5468 seq_printf(seq
," super %d.%d",
5469 mddev
->major_version
,
5470 mddev
->minor_version
);
5472 } else if (mddev
->external
)
5473 seq_printf(seq
, " super external:%s",
5474 mddev
->metadata_type
);
5476 seq_printf(seq
, " super non-persistent");
5479 mddev
->pers
->status(seq
, mddev
);
5480 seq_printf(seq
, "\n ");
5481 if (mddev
->pers
->sync_request
) {
5482 if (mddev
->curr_resync
> 2) {
5483 status_resync(seq
, mddev
);
5484 seq_printf(seq
, "\n ");
5485 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5486 seq_printf(seq
, "\tresync=DELAYED\n ");
5487 else if (mddev
->recovery_cp
< MaxSector
)
5488 seq_printf(seq
, "\tresync=PENDING\n ");
5491 seq_printf(seq
, "\n ");
5493 if ((bitmap
= mddev
->bitmap
)) {
5494 unsigned long chunk_kb
;
5495 unsigned long flags
;
5496 spin_lock_irqsave(&bitmap
->lock
, flags
);
5497 chunk_kb
= bitmap
->chunksize
>> 10;
5498 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5500 bitmap
->pages
- bitmap
->missing_pages
,
5502 (bitmap
->pages
- bitmap
->missing_pages
)
5503 << (PAGE_SHIFT
- 10),
5504 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5505 chunk_kb
? "KB" : "B");
5507 seq_printf(seq
, ", file: ");
5508 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5511 seq_printf(seq
, "\n");
5512 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5515 seq_printf(seq
, "\n");
5517 mddev_unlock(mddev
);
5522 static struct seq_operations md_seq_ops
= {
5523 .start
= md_seq_start
,
5524 .next
= md_seq_next
,
5525 .stop
= md_seq_stop
,
5526 .show
= md_seq_show
,
5529 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5532 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5536 error
= seq_open(file
, &md_seq_ops
);
5540 struct seq_file
*p
= file
->private_data
;
5542 mi
->event
= atomic_read(&md_event_count
);
5547 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5549 struct seq_file
*m
= filp
->private_data
;
5550 struct mdstat_info
*mi
= m
->private;
5553 poll_wait(filp
, &md_event_waiters
, wait
);
5555 /* always allow read */
5556 mask
= POLLIN
| POLLRDNORM
;
5558 if (mi
->event
!= atomic_read(&md_event_count
))
5559 mask
|= POLLERR
| POLLPRI
;
5563 static const struct file_operations md_seq_fops
= {
5564 .owner
= THIS_MODULE
,
5565 .open
= md_seq_open
,
5567 .llseek
= seq_lseek
,
5568 .release
= seq_release_private
,
5569 .poll
= mdstat_poll
,
5572 int register_md_personality(struct mdk_personality
*p
)
5574 spin_lock(&pers_lock
);
5575 list_add_tail(&p
->list
, &pers_list
);
5576 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
5577 spin_unlock(&pers_lock
);
5581 int unregister_md_personality(struct mdk_personality
*p
)
5583 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
5584 spin_lock(&pers_lock
);
5585 list_del_init(&p
->list
);
5586 spin_unlock(&pers_lock
);
5590 static int is_mddev_idle(mddev_t
*mddev
)
5598 rdev_for_each_rcu(rdev
, mddev
) {
5599 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
5600 curr_events
= part_stat_read(&disk
->part0
, sectors
[0]) +
5601 part_stat_read(&disk
->part0
, sectors
[1]) -
5602 atomic_read(&disk
->sync_io
);
5603 /* sync IO will cause sync_io to increase before the disk_stats
5604 * as sync_io is counted when a request starts, and
5605 * disk_stats is counted when it completes.
5606 * So resync activity will cause curr_events to be smaller than
5607 * when there was no such activity.
5608 * non-sync IO will cause disk_stat to increase without
5609 * increasing sync_io so curr_events will (eventually)
5610 * be larger than it was before. Once it becomes
5611 * substantially larger, the test below will cause
5612 * the array to appear non-idle, and resync will slow
5614 * If there is a lot of outstanding resync activity when
5615 * we set last_event to curr_events, then all that activity
5616 * completing might cause the array to appear non-idle
5617 * and resync will be slowed down even though there might
5618 * not have been non-resync activity. This will only
5619 * happen once though. 'last_events' will soon reflect
5620 * the state where there is little or no outstanding
5621 * resync requests, and further resync activity will
5622 * always make curr_events less than last_events.
5625 if (curr_events
- rdev
->last_events
> 4096) {
5626 rdev
->last_events
= curr_events
;
5634 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
5636 /* another "blocks" (512byte) blocks have been synced */
5637 atomic_sub(blocks
, &mddev
->recovery_active
);
5638 wake_up(&mddev
->recovery_wait
);
5640 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5641 md_wakeup_thread(mddev
->thread
);
5642 // stop recovery, signal do_sync ....
5647 /* md_write_start(mddev, bi)
5648 * If we need to update some array metadata (e.g. 'active' flag
5649 * in superblock) before writing, schedule a superblock update
5650 * and wait for it to complete.
5652 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
5655 if (bio_data_dir(bi
) != WRITE
)
5658 BUG_ON(mddev
->ro
== 1);
5659 if (mddev
->ro
== 2) {
5660 /* need to switch to read/write */
5662 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5663 md_wakeup_thread(mddev
->thread
);
5664 md_wakeup_thread(mddev
->sync_thread
);
5667 atomic_inc(&mddev
->writes_pending
);
5668 if (mddev
->safemode
== 1)
5669 mddev
->safemode
= 0;
5670 if (mddev
->in_sync
) {
5671 spin_lock_irq(&mddev
->write_lock
);
5672 if (mddev
->in_sync
) {
5674 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5675 md_wakeup_thread(mddev
->thread
);
5678 spin_unlock_irq(&mddev
->write_lock
);
5681 sysfs_notify_dirent(mddev
->sysfs_state
);
5682 wait_event(mddev
->sb_wait
,
5683 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
5684 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
5687 void md_write_end(mddev_t
*mddev
)
5689 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5690 if (mddev
->safemode
== 2)
5691 md_wakeup_thread(mddev
->thread
);
5692 else if (mddev
->safemode_delay
)
5693 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5697 /* md_allow_write(mddev)
5698 * Calling this ensures that the array is marked 'active' so that writes
5699 * may proceed without blocking. It is important to call this before
5700 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5701 * Must be called with mddev_lock held.
5703 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5704 * is dropped, so return -EAGAIN after notifying userspace.
5706 int md_allow_write(mddev_t
*mddev
)
5712 if (!mddev
->pers
->sync_request
)
5715 spin_lock_irq(&mddev
->write_lock
);
5716 if (mddev
->in_sync
) {
5718 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5719 if (mddev
->safemode_delay
&&
5720 mddev
->safemode
== 0)
5721 mddev
->safemode
= 1;
5722 spin_unlock_irq(&mddev
->write_lock
);
5723 md_update_sb(mddev
, 0);
5724 sysfs_notify_dirent(mddev
->sysfs_state
);
5726 spin_unlock_irq(&mddev
->write_lock
);
5728 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
5733 EXPORT_SYMBOL_GPL(md_allow_write
);
5735 #define SYNC_MARKS 10
5736 #define SYNC_MARK_STEP (3*HZ)
5737 void md_do_sync(mddev_t
*mddev
)
5740 unsigned int currspeed
= 0,
5742 sector_t max_sectors
,j
, io_sectors
;
5743 unsigned long mark
[SYNC_MARKS
];
5744 sector_t mark_cnt
[SYNC_MARKS
];
5746 struct list_head
*tmp
;
5747 sector_t last_check
;
5752 /* just incase thread restarts... */
5753 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5755 if (mddev
->ro
) /* never try to sync a read-only array */
5758 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5759 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5760 desc
= "data-check";
5761 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5762 desc
= "requested-resync";
5765 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5770 /* we overload curr_resync somewhat here.
5771 * 0 == not engaged in resync at all
5772 * 2 == checking that there is no conflict with another sync
5773 * 1 == like 2, but have yielded to allow conflicting resync to
5775 * other == active in resync - this many blocks
5777 * Before starting a resync we must have set curr_resync to
5778 * 2, and then checked that every "conflicting" array has curr_resync
5779 * less than ours. When we find one that is the same or higher
5780 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5781 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5782 * This will mean we have to start checking from the beginning again.
5787 mddev
->curr_resync
= 2;
5790 if (kthread_should_stop()) {
5791 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5794 for_each_mddev(mddev2
, tmp
) {
5795 if (mddev2
== mddev
)
5797 if (!mddev
->parallel_resync
5798 && mddev2
->curr_resync
5799 && match_mddev_units(mddev
, mddev2
)) {
5801 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5802 /* arbitrarily yield */
5803 mddev
->curr_resync
= 1;
5804 wake_up(&resync_wait
);
5806 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5807 /* no need to wait here, we can wait the next
5808 * time 'round when curr_resync == 2
5811 /* We need to wait 'interruptible' so as not to
5812 * contribute to the load average, and not to
5813 * be caught by 'softlockup'
5815 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
5816 if (!kthread_should_stop() &&
5817 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5818 printk(KERN_INFO
"md: delaying %s of %s"
5819 " until %s has finished (they"
5820 " share one or more physical units)\n",
5821 desc
, mdname(mddev
), mdname(mddev2
));
5823 if (signal_pending(current
))
5824 flush_signals(current
);
5826 finish_wait(&resync_wait
, &wq
);
5829 finish_wait(&resync_wait
, &wq
);
5832 } while (mddev
->curr_resync
< 2);
5835 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5836 /* resync follows the size requested by the personality,
5837 * which defaults to physical size, but can be virtual size
5839 max_sectors
= mddev
->resync_max_sectors
;
5840 mddev
->resync_mismatches
= 0;
5841 /* we don't use the checkpoint if there's a bitmap */
5842 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5843 j
= mddev
->resync_min
;
5844 else if (!mddev
->bitmap
)
5845 j
= mddev
->recovery_cp
;
5847 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5848 max_sectors
= mddev
->size
<< 1;
5850 /* recovery follows the physical size of devices */
5851 max_sectors
= mddev
->size
<< 1;
5853 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
5854 if (rdev
->raid_disk
>= 0 &&
5855 !test_bit(Faulty
, &rdev
->flags
) &&
5856 !test_bit(In_sync
, &rdev
->flags
) &&
5857 rdev
->recovery_offset
< j
)
5858 j
= rdev
->recovery_offset
;
5861 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5862 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5863 " %d KB/sec/disk.\n", speed_min(mddev
));
5864 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5865 "(but not more than %d KB/sec) for %s.\n",
5866 speed_max(mddev
), desc
);
5868 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5871 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5873 mark_cnt
[m
] = io_sectors
;
5876 mddev
->resync_mark
= mark
[last_mark
];
5877 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5880 * Tune reconstruction:
5882 window
= 32*(PAGE_SIZE
/512);
5883 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5884 window
/2,(unsigned long long) max_sectors
/2);
5886 atomic_set(&mddev
->recovery_active
, 0);
5891 "md: resuming %s of %s from checkpoint.\n",
5892 desc
, mdname(mddev
));
5893 mddev
->curr_resync
= j
;
5896 while (j
< max_sectors
) {
5900 if (j
>= mddev
->resync_max
) {
5901 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
5902 wait_event(mddev
->recovery_wait
,
5903 mddev
->resync_max
> j
5904 || kthread_should_stop());
5906 if (kthread_should_stop())
5908 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5909 currspeed
< speed_min(mddev
));
5911 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5915 if (!skipped
) { /* actual IO requested */
5916 io_sectors
+= sectors
;
5917 atomic_add(sectors
, &mddev
->recovery_active
);
5921 if (j
>1) mddev
->curr_resync
= j
;
5922 mddev
->curr_mark_cnt
= io_sectors
;
5923 if (last_check
== 0)
5924 /* this is the earliers that rebuilt will be
5925 * visible in /proc/mdstat
5927 md_new_event(mddev
);
5929 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5932 last_check
= io_sectors
;
5934 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5938 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5940 int next
= (last_mark
+1) % SYNC_MARKS
;
5942 mddev
->resync_mark
= mark
[next
];
5943 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5944 mark
[next
] = jiffies
;
5945 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5950 if (kthread_should_stop())
5955 * this loop exits only if either when we are slower than
5956 * the 'hard' speed limit, or the system was IO-idle for
5958 * the system might be non-idle CPU-wise, but we only care
5959 * about not overloading the IO subsystem. (things like an
5960 * e2fsck being done on the RAID array should execute fast)
5962 blk_unplug(mddev
->queue
);
5965 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5966 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5968 if (currspeed
> speed_min(mddev
)) {
5969 if ((currspeed
> speed_max(mddev
)) ||
5970 !is_mddev_idle(mddev
)) {
5976 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5978 * this also signals 'finished resyncing' to md_stop
5981 blk_unplug(mddev
->queue
);
5983 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5985 /* tell personality that we are finished */
5986 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5988 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5989 mddev
->curr_resync
> 2) {
5990 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5991 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5992 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5994 "md: checkpointing %s of %s.\n",
5995 desc
, mdname(mddev
));
5996 mddev
->recovery_cp
= mddev
->curr_resync
;
5999 mddev
->recovery_cp
= MaxSector
;
6001 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6002 mddev
->curr_resync
= MaxSector
;
6003 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6004 if (rdev
->raid_disk
>= 0 &&
6005 !test_bit(Faulty
, &rdev
->flags
) &&
6006 !test_bit(In_sync
, &rdev
->flags
) &&
6007 rdev
->recovery_offset
< mddev
->curr_resync
)
6008 rdev
->recovery_offset
= mddev
->curr_resync
;
6011 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6014 mddev
->curr_resync
= 0;
6015 mddev
->resync_min
= 0;
6016 mddev
->resync_max
= MaxSector
;
6017 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6018 wake_up(&resync_wait
);
6019 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6020 md_wakeup_thread(mddev
->thread
);
6025 * got a signal, exit.
6028 "md: md_do_sync() got signal ... exiting\n");
6029 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6033 EXPORT_SYMBOL_GPL(md_do_sync
);
6036 static int remove_and_add_spares(mddev_t
*mddev
)
6041 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6042 if (rdev
->raid_disk
>= 0 &&
6043 !test_bit(Blocked
, &rdev
->flags
) &&
6044 (test_bit(Faulty
, &rdev
->flags
) ||
6045 ! test_bit(In_sync
, &rdev
->flags
)) &&
6046 atomic_read(&rdev
->nr_pending
)==0) {
6047 if (mddev
->pers
->hot_remove_disk(
6048 mddev
, rdev
->raid_disk
)==0) {
6050 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6051 sysfs_remove_link(&mddev
->kobj
, nm
);
6052 rdev
->raid_disk
= -1;
6056 if (mddev
->degraded
&& ! mddev
->ro
) {
6057 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6058 if (rdev
->raid_disk
>= 0 &&
6059 !test_bit(In_sync
, &rdev
->flags
) &&
6060 !test_bit(Blocked
, &rdev
->flags
))
6062 if (rdev
->raid_disk
< 0
6063 && !test_bit(Faulty
, &rdev
->flags
)) {
6064 rdev
->recovery_offset
= 0;
6066 hot_add_disk(mddev
, rdev
) == 0) {
6068 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6069 if (sysfs_create_link(&mddev
->kobj
,
6072 "md: cannot register "
6076 md_new_event(mddev
);
6085 * This routine is regularly called by all per-raid-array threads to
6086 * deal with generic issues like resync and super-block update.
6087 * Raid personalities that don't have a thread (linear/raid0) do not
6088 * need this as they never do any recovery or update the superblock.
6090 * It does not do any resync itself, but rather "forks" off other threads
6091 * to do that as needed.
6092 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6093 * "->recovery" and create a thread at ->sync_thread.
6094 * When the thread finishes it sets MD_RECOVERY_DONE
6095 * and wakeups up this thread which will reap the thread and finish up.
6096 * This thread also removes any faulty devices (with nr_pending == 0).
6098 * The overall approach is:
6099 * 1/ if the superblock needs updating, update it.
6100 * 2/ If a recovery thread is running, don't do anything else.
6101 * 3/ If recovery has finished, clean up, possibly marking spares active.
6102 * 4/ If there are any faulty devices, remove them.
6103 * 5/ If array is degraded, try to add spares devices
6104 * 6/ If array has spares or is not in-sync, start a resync thread.
6106 void md_check_recovery(mddev_t
*mddev
)
6112 bitmap_daemon_work(mddev
->bitmap
);
6117 if (signal_pending(current
)) {
6118 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6119 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6121 mddev
->safemode
= 2;
6123 flush_signals(current
);
6126 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6129 (mddev
->flags
&& !mddev
->external
) ||
6130 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6131 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6132 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6133 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6134 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6138 if (mddev_trylock(mddev
)) {
6142 /* Only thing we do on a ro array is remove
6145 remove_and_add_spares(mddev
);
6146 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6150 if (!mddev
->external
) {
6152 spin_lock_irq(&mddev
->write_lock
);
6153 if (mddev
->safemode
&&
6154 !atomic_read(&mddev
->writes_pending
) &&
6156 mddev
->recovery_cp
== MaxSector
) {
6159 if (mddev
->persistent
)
6160 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6162 if (mddev
->safemode
== 1)
6163 mddev
->safemode
= 0;
6164 spin_unlock_irq(&mddev
->write_lock
);
6166 sysfs_notify_dirent(mddev
->sysfs_state
);
6170 md_update_sb(mddev
, 0);
6172 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6173 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6174 sysfs_notify_dirent(rdev
->sysfs_state
);
6177 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6178 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6179 /* resync/recovery still happening */
6180 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6183 if (mddev
->sync_thread
) {
6184 /* resync has finished, collect result */
6185 md_unregister_thread(mddev
->sync_thread
);
6186 mddev
->sync_thread
= NULL
;
6187 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6188 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6190 /* activate any spares */
6191 if (mddev
->pers
->spare_active(mddev
))
6192 sysfs_notify(&mddev
->kobj
, NULL
,
6195 md_update_sb(mddev
, 1);
6197 /* if array is no-longer degraded, then any saved_raid_disk
6198 * information must be scrapped
6200 if (!mddev
->degraded
)
6201 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6202 rdev
->saved_raid_disk
= -1;
6204 mddev
->recovery
= 0;
6205 /* flag recovery needed just to double check */
6206 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6207 sysfs_notify_dirent(mddev
->sysfs_action
);
6208 md_new_event(mddev
);
6211 /* Set RUNNING before clearing NEEDED to avoid
6212 * any transients in the value of "sync_action".
6214 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6215 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6216 /* Clear some bits that don't mean anything, but
6219 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6220 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6222 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6224 /* no recovery is running.
6225 * remove any failed drives, then
6226 * add spares if possible.
6227 * Spare are also removed and re-added, to allow
6228 * the personality to fail the re-add.
6231 if (mddev
->reshape_position
!= MaxSector
) {
6232 if (mddev
->pers
->check_reshape(mddev
) != 0)
6233 /* Cannot proceed */
6235 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6236 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6237 } else if ((spares
= remove_and_add_spares(mddev
))) {
6238 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6239 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6240 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6241 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6242 } else if (mddev
->recovery_cp
< MaxSector
) {
6243 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6244 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6245 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6246 /* nothing to be done ... */
6249 if (mddev
->pers
->sync_request
) {
6250 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6251 /* We are adding a device or devices to an array
6252 * which has the bitmap stored on all devices.
6253 * So make sure all bitmap pages get written
6255 bitmap_write_all(mddev
->bitmap
);
6257 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6260 if (!mddev
->sync_thread
) {
6261 printk(KERN_ERR
"%s: could not start resync"
6264 /* leave the spares where they are, it shouldn't hurt */
6265 mddev
->recovery
= 0;
6267 md_wakeup_thread(mddev
->sync_thread
);
6268 sysfs_notify_dirent(mddev
->sysfs_action
);
6269 md_new_event(mddev
);
6272 if (!mddev
->sync_thread
) {
6273 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6274 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6276 if (mddev
->sysfs_action
)
6277 sysfs_notify_dirent(mddev
->sysfs_action
);
6279 mddev_unlock(mddev
);
6283 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6285 sysfs_notify_dirent(rdev
->sysfs_state
);
6286 wait_event_timeout(rdev
->blocked_wait
,
6287 !test_bit(Blocked
, &rdev
->flags
),
6288 msecs_to_jiffies(5000));
6289 rdev_dec_pending(rdev
, mddev
);
6291 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6293 static int md_notify_reboot(struct notifier_block
*this,
6294 unsigned long code
, void *x
)
6296 struct list_head
*tmp
;
6299 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6301 printk(KERN_INFO
"md: stopping all md devices.\n");
6303 for_each_mddev(mddev
, tmp
)
6304 if (mddev_trylock(mddev
)) {
6305 /* Force a switch to readonly even array
6306 * appears to still be in use. Hence
6309 do_md_stop(mddev
, 1, 100);
6310 mddev_unlock(mddev
);
6313 * certain more exotic SCSI devices are known to be
6314 * volatile wrt too early system reboots. While the
6315 * right place to handle this issue is the given
6316 * driver, we do want to have a safe RAID driver ...
6323 static struct notifier_block md_notifier
= {
6324 .notifier_call
= md_notify_reboot
,
6326 .priority
= INT_MAX
, /* before any real devices */
6329 static void md_geninit(void)
6331 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6333 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6336 static int __init
md_init(void)
6338 if (register_blkdev(MAJOR_NR
, "md"))
6340 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6341 unregister_blkdev(MAJOR_NR
, "md");
6344 blk_register_region(MKDEV(MAJOR_NR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6345 md_probe
, NULL
, NULL
);
6346 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6347 md_probe
, NULL
, NULL
);
6349 register_reboot_notifier(&md_notifier
);
6350 raid_table_header
= register_sysctl_table(raid_root_table
);
6360 * Searches all registered partitions for autorun RAID arrays
6364 static LIST_HEAD(all_detected_devices
);
6365 struct detected_devices_node
{
6366 struct list_head list
;
6370 void md_autodetect_dev(dev_t dev
)
6372 struct detected_devices_node
*node_detected_dev
;
6374 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6375 if (node_detected_dev
) {
6376 node_detected_dev
->dev
= dev
;
6377 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6379 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6380 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6385 static void autostart_arrays(int part
)
6388 struct detected_devices_node
*node_detected_dev
;
6390 int i_scanned
, i_passed
;
6395 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6397 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6399 node_detected_dev
= list_entry(all_detected_devices
.next
,
6400 struct detected_devices_node
, list
);
6401 list_del(&node_detected_dev
->list
);
6402 dev
= node_detected_dev
->dev
;
6403 kfree(node_detected_dev
);
6404 rdev
= md_import_device(dev
,0, 90);
6408 if (test_bit(Faulty
, &rdev
->flags
)) {
6412 set_bit(AutoDetected
, &rdev
->flags
);
6413 list_add(&rdev
->same_set
, &pending_raid_disks
);
6417 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6418 i_scanned
, i_passed
);
6420 autorun_devices(part
);
6423 #endif /* !MODULE */
6425 static __exit
void md_exit(void)
6428 struct list_head
*tmp
;
6430 blk_unregister_region(MKDEV(MAJOR_NR
,0), 1U << MINORBITS
);
6431 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6433 unregister_blkdev(MAJOR_NR
,"md");
6434 unregister_blkdev(mdp_major
, "mdp");
6435 unregister_reboot_notifier(&md_notifier
);
6436 unregister_sysctl_table(raid_table_header
);
6437 remove_proc_entry("mdstat", NULL
);
6438 for_each_mddev(mddev
, tmp
) {
6439 struct gendisk
*disk
= mddev
->gendisk
;
6442 export_array(mddev
);
6447 subsys_initcall(md_init
);
6448 module_exit(md_exit
)
6450 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6452 return sprintf(buffer
, "%d", start_readonly
);
6454 static int set_ro(const char *val
, struct kernel_param
*kp
)
6457 int num
= simple_strtoul(val
, &e
, 10);
6458 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6459 start_readonly
= num
;
6465 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6466 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6469 EXPORT_SYMBOL(register_md_personality
);
6470 EXPORT_SYMBOL(unregister_md_personality
);
6471 EXPORT_SYMBOL(md_error
);
6472 EXPORT_SYMBOL(md_done_sync
);
6473 EXPORT_SYMBOL(md_write_start
);
6474 EXPORT_SYMBOL(md_write_end
);
6475 EXPORT_SYMBOL(md_register_thread
);
6476 EXPORT_SYMBOL(md_unregister_thread
);
6477 EXPORT_SYMBOL(md_wakeup_thread
);
6478 EXPORT_SYMBOL(md_check_recovery
);
6479 MODULE_LICENSE("GPL");
6481 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);