2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/kthread.h>
37 #include <linux/linkage.h>
38 #include <linux/raid/md.h>
39 #include <linux/raid/bitmap.h>
40 #include <linux/sysctl.h>
41 #include <linux/buffer_head.h> /* for invalidate_bdev */
42 #include <linux/suspend.h>
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
47 #include <linux/init.h>
49 #include <linux/file.h>
52 #include <linux/kmod.h>
55 #include <asm/unaligned.h>
57 #define MAJOR_NR MD_MAJOR
60 /* 63 partitions with the alternate major number (mdp) */
61 #define MdpMinorShift 6
64 #define dprintk(x...) ((void)(DEBUG && printk(x)))
68 static void autostart_arrays (int part
);
71 static LIST_HEAD(pers_list
);
72 static DEFINE_SPINLOCK(pers_lock
);
74 static void md_print_devices(void);
76 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
79 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
80 * is 1000 KB/sec, so the extra system load does not show up that much.
81 * Increase it if you want to have more _guaranteed_ speed. Note that
82 * the RAID driver will use the maximum available bandwidth if the IO
83 * subsystem is idle. There is also an 'absolute maximum' reconstruction
84 * speed limit - in case reconstruction slows down your system despite
87 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
88 * or /sys/block/mdX/md/sync_speed_{min,max}
91 static int sysctl_speed_limit_min
= 1000;
92 static int sysctl_speed_limit_max
= 200000;
93 static inline int speed_min(mddev_t
*mddev
)
95 return mddev
->sync_speed_min
?
96 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
99 static inline int speed_max(mddev_t
*mddev
)
101 return mddev
->sync_speed_max
?
102 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
105 static struct ctl_table_header
*raid_table_header
;
107 static ctl_table raid_table
[] = {
109 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
110 .procname
= "speed_limit_min",
111 .data
= &sysctl_speed_limit_min
,
112 .maxlen
= sizeof(int),
113 .mode
= S_IRUGO
|S_IWUSR
,
114 .proc_handler
= &proc_dointvec
,
117 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
118 .procname
= "speed_limit_max",
119 .data
= &sysctl_speed_limit_max
,
120 .maxlen
= sizeof(int),
121 .mode
= S_IRUGO
|S_IWUSR
,
122 .proc_handler
= &proc_dointvec
,
127 static ctl_table raid_dir_table
[] = {
129 .ctl_name
= DEV_RAID
,
132 .mode
= S_IRUGO
|S_IXUGO
,
138 static ctl_table raid_root_table
[] = {
144 .child
= raid_dir_table
,
149 static struct block_device_operations md_fops
;
151 static int start_readonly
;
154 * We have a system wide 'event count' that is incremented
155 * on any 'interesting' event, and readers of /proc/mdstat
156 * can use 'poll' or 'select' to find out when the event
160 * start array, stop array, error, add device, remove device,
161 * start build, activate spare
163 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
164 static atomic_t md_event_count
;
165 void md_new_event(mddev_t
*mddev
)
167 atomic_inc(&md_event_count
);
168 wake_up(&md_event_waiters
);
169 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
171 EXPORT_SYMBOL_GPL(md_new_event
);
173 /* Alternate version that can be called from interrupts
174 * when calling sysfs_notify isn't needed.
176 static void md_new_event_inintr(mddev_t
*mddev
)
178 atomic_inc(&md_event_count
);
179 wake_up(&md_event_waiters
);
183 * Enables to iterate over all existing md arrays
184 * all_mddevs_lock protects this list.
186 static LIST_HEAD(all_mddevs
);
187 static DEFINE_SPINLOCK(all_mddevs_lock
);
191 * iterates through all used mddevs in the system.
192 * We take care to grab the all_mddevs_lock whenever navigating
193 * the list, and to always hold a refcount when unlocked.
194 * Any code which breaks out of this loop while own
195 * a reference to the current mddev and must mddev_put it.
197 #define ITERATE_MDDEV(mddev,tmp) \
199 for (({ spin_lock(&all_mddevs_lock); \
200 tmp = all_mddevs.next; \
202 ({ if (tmp != &all_mddevs) \
203 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
204 spin_unlock(&all_mddevs_lock); \
205 if (mddev) mddev_put(mddev); \
206 mddev = list_entry(tmp, mddev_t, all_mddevs); \
207 tmp != &all_mddevs;}); \
208 ({ spin_lock(&all_mddevs_lock); \
213 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
215 bio_io_error(bio
, bio
->bi_size
);
219 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
221 atomic_inc(&mddev
->active
);
225 static void mddev_put(mddev_t
*mddev
)
227 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
229 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
230 list_del(&mddev
->all_mddevs
);
231 spin_unlock(&all_mddevs_lock
);
232 blk_cleanup_queue(mddev
->queue
);
233 kobject_unregister(&mddev
->kobj
);
235 spin_unlock(&all_mddevs_lock
);
238 static mddev_t
* mddev_find(dev_t unit
)
240 mddev_t
*mddev
, *new = NULL
;
243 spin_lock(&all_mddevs_lock
);
244 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
245 if (mddev
->unit
== unit
) {
247 spin_unlock(&all_mddevs_lock
);
253 list_add(&new->all_mddevs
, &all_mddevs
);
254 spin_unlock(&all_mddevs_lock
);
257 spin_unlock(&all_mddevs_lock
);
259 new = kzalloc(sizeof(*new), GFP_KERNEL
);
264 if (MAJOR(unit
) == MD_MAJOR
)
265 new->md_minor
= MINOR(unit
);
267 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
269 mutex_init(&new->reconfig_mutex
);
270 INIT_LIST_HEAD(&new->disks
);
271 INIT_LIST_HEAD(&new->all_mddevs
);
272 init_timer(&new->safemode_timer
);
273 atomic_set(&new->active
, 1);
274 spin_lock_init(&new->write_lock
);
275 init_waitqueue_head(&new->sb_wait
);
277 new->queue
= blk_alloc_queue(GFP_KERNEL
);
282 set_bit(QUEUE_FLAG_CLUSTER
, &new->queue
->queue_flags
);
284 blk_queue_make_request(new->queue
, md_fail_request
);
289 static inline int mddev_lock(mddev_t
* mddev
)
291 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
294 static inline int mddev_trylock(mddev_t
* mddev
)
296 return mutex_trylock(&mddev
->reconfig_mutex
);
299 static inline void mddev_unlock(mddev_t
* mddev
)
301 mutex_unlock(&mddev
->reconfig_mutex
);
303 md_wakeup_thread(mddev
->thread
);
306 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
309 struct list_head
*tmp
;
311 ITERATE_RDEV(mddev
,rdev
,tmp
) {
312 if (rdev
->desc_nr
== nr
)
318 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
320 struct list_head
*tmp
;
323 ITERATE_RDEV(mddev
,rdev
,tmp
) {
324 if (rdev
->bdev
->bd_dev
== dev
)
330 static struct mdk_personality
*find_pers(int level
, char *clevel
)
332 struct mdk_personality
*pers
;
333 list_for_each_entry(pers
, &pers_list
, list
) {
334 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
336 if (strcmp(pers
->name
, clevel
)==0)
342 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
344 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
345 return MD_NEW_SIZE_BLOCKS(size
);
348 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
352 size
= rdev
->sb_offset
;
355 size
&= ~((sector_t
)chunk_size
/1024 - 1);
359 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
364 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
365 if (!rdev
->sb_page
) {
366 printk(KERN_ALERT
"md: out of memory.\n");
373 static void free_disk_sb(mdk_rdev_t
* rdev
)
376 put_page(rdev
->sb_page
);
378 rdev
->sb_page
= NULL
;
385 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
387 mdk_rdev_t
*rdev
= bio
->bi_private
;
388 mddev_t
*mddev
= rdev
->mddev
;
392 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
393 md_error(mddev
, rdev
);
395 if (atomic_dec_and_test(&mddev
->pending_writes
))
396 wake_up(&mddev
->sb_wait
);
401 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
403 struct bio
*bio2
= bio
->bi_private
;
404 mdk_rdev_t
*rdev
= bio2
->bi_private
;
405 mddev_t
*mddev
= rdev
->mddev
;
409 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
410 error
== -EOPNOTSUPP
) {
412 /* barriers don't appear to be supported :-( */
413 set_bit(BarriersNotsupp
, &rdev
->flags
);
414 mddev
->barriers_work
= 0;
415 spin_lock_irqsave(&mddev
->write_lock
, flags
);
416 bio2
->bi_next
= mddev
->biolist
;
417 mddev
->biolist
= bio2
;
418 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
419 wake_up(&mddev
->sb_wait
);
424 bio
->bi_private
= rdev
;
425 return super_written(bio
, bytes_done
, error
);
428 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
429 sector_t sector
, int size
, struct page
*page
)
431 /* write first size bytes of page to sector of rdev
432 * Increment mddev->pending_writes before returning
433 * and decrement it on completion, waking up sb_wait
434 * if zero is reached.
435 * If an error occurred, call md_error
437 * As we might need to resubmit the request if BIO_RW_BARRIER
438 * causes ENOTSUPP, we allocate a spare bio...
440 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
441 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
443 bio
->bi_bdev
= rdev
->bdev
;
444 bio
->bi_sector
= sector
;
445 bio_add_page(bio
, page
, size
, 0);
446 bio
->bi_private
= rdev
;
447 bio
->bi_end_io
= super_written
;
450 atomic_inc(&mddev
->pending_writes
);
451 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
453 rw
|= (1<<BIO_RW_BARRIER
);
454 rbio
= bio_clone(bio
, GFP_NOIO
);
455 rbio
->bi_private
= bio
;
456 rbio
->bi_end_io
= super_written_barrier
;
457 submit_bio(rw
, rbio
);
462 void md_super_wait(mddev_t
*mddev
)
464 /* wait for all superblock writes that were scheduled to complete.
465 * if any had to be retried (due to BARRIER problems), retry them
469 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
470 if (atomic_read(&mddev
->pending_writes
)==0)
472 while (mddev
->biolist
) {
474 spin_lock_irq(&mddev
->write_lock
);
475 bio
= mddev
->biolist
;
476 mddev
->biolist
= bio
->bi_next
;
478 spin_unlock_irq(&mddev
->write_lock
);
479 submit_bio(bio
->bi_rw
, bio
);
483 finish_wait(&mddev
->sb_wait
, &wq
);
486 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
491 complete((struct completion
*)bio
->bi_private
);
495 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
496 struct page
*page
, int rw
)
498 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
499 struct completion event
;
502 rw
|= (1 << BIO_RW_SYNC
);
505 bio
->bi_sector
= sector
;
506 bio_add_page(bio
, page
, size
, 0);
507 init_completion(&event
);
508 bio
->bi_private
= &event
;
509 bio
->bi_end_io
= bi_complete
;
511 wait_for_completion(&event
);
513 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
517 EXPORT_SYMBOL_GPL(sync_page_io
);
519 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
521 char b
[BDEVNAME_SIZE
];
522 if (!rdev
->sb_page
) {
530 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
536 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
537 bdevname(rdev
->bdev
,b
));
541 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
543 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
544 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
545 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
546 (sb1
->set_uuid3
== sb2
->set_uuid3
))
554 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
557 mdp_super_t
*tmp1
, *tmp2
;
559 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
560 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
562 if (!tmp1
|| !tmp2
) {
564 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
572 * nr_disks is not constant
577 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
588 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
590 unsigned int disk_csum
, csum
;
592 disk_csum
= sb
->sb_csum
;
594 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
595 sb
->sb_csum
= disk_csum
;
601 * Handle superblock details.
602 * We want to be able to handle multiple superblock formats
603 * so we have a common interface to them all, and an array of
604 * different handlers.
605 * We rely on user-space to write the initial superblock, and support
606 * reading and updating of superblocks.
607 * Interface methods are:
608 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
609 * loads and validates a superblock on dev.
610 * if refdev != NULL, compare superblocks on both devices
612 * 0 - dev has a superblock that is compatible with refdev
613 * 1 - dev has a superblock that is compatible and newer than refdev
614 * so dev should be used as the refdev in future
615 * -EINVAL superblock incompatible or invalid
616 * -othererror e.g. -EIO
618 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
619 * Verify that dev is acceptable into mddev.
620 * The first time, mddev->raid_disks will be 0, and data from
621 * dev should be merged in. Subsequent calls check that dev
622 * is new enough. Return 0 or -EINVAL
624 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
625 * Update the superblock for rdev with data in mddev
626 * This does not write to disc.
632 struct module
*owner
;
633 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
634 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
635 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
639 * load_super for 0.90.0
641 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
643 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
649 * Calculate the position of the superblock,
650 * it's at the end of the disk.
652 * It also happens to be a multiple of 4Kb.
654 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
655 rdev
->sb_offset
= sb_offset
;
657 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
662 bdevname(rdev
->bdev
, b
);
663 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
665 if (sb
->md_magic
!= MD_SB_MAGIC
) {
666 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
671 if (sb
->major_version
!= 0 ||
672 sb
->minor_version
< 90 ||
673 sb
->minor_version
> 91) {
674 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
675 sb
->major_version
, sb
->minor_version
,
680 if (sb
->raid_disks
<= 0)
683 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
684 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
689 rdev
->preferred_minor
= sb
->md_minor
;
690 rdev
->data_offset
= 0;
691 rdev
->sb_size
= MD_SB_BYTES
;
693 if (sb
->level
== LEVEL_MULTIPATH
)
696 rdev
->desc_nr
= sb
->this_disk
.number
;
702 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
703 if (!uuid_equal(refsb
, sb
)) {
704 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
705 b
, bdevname(refdev
->bdev
,b2
));
708 if (!sb_equal(refsb
, sb
)) {
709 printk(KERN_WARNING
"md: %s has same UUID"
710 " but different superblock to %s\n",
711 b
, bdevname(refdev
->bdev
, b2
));
715 ev2
= md_event(refsb
);
721 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
723 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
724 /* "this cannot possibly happen" ... */
732 * validate_super for 0.90.0
734 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
737 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
738 __u64 ev1
= md_event(sb
);
740 rdev
->raid_disk
= -1;
742 if (mddev
->raid_disks
== 0) {
743 mddev
->major_version
= 0;
744 mddev
->minor_version
= sb
->minor_version
;
745 mddev
->patch_version
= sb
->patch_version
;
746 mddev
->persistent
= ! sb
->not_persistent
;
747 mddev
->chunk_size
= sb
->chunk_size
;
748 mddev
->ctime
= sb
->ctime
;
749 mddev
->utime
= sb
->utime
;
750 mddev
->level
= sb
->level
;
751 mddev
->clevel
[0] = 0;
752 mddev
->layout
= sb
->layout
;
753 mddev
->raid_disks
= sb
->raid_disks
;
754 mddev
->size
= sb
->size
;
756 mddev
->bitmap_offset
= 0;
757 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
759 if (mddev
->minor_version
>= 91) {
760 mddev
->reshape_position
= sb
->reshape_position
;
761 mddev
->delta_disks
= sb
->delta_disks
;
762 mddev
->new_level
= sb
->new_level
;
763 mddev
->new_layout
= sb
->new_layout
;
764 mddev
->new_chunk
= sb
->new_chunk
;
766 mddev
->reshape_position
= MaxSector
;
767 mddev
->delta_disks
= 0;
768 mddev
->new_level
= mddev
->level
;
769 mddev
->new_layout
= mddev
->layout
;
770 mddev
->new_chunk
= mddev
->chunk_size
;
773 if (sb
->state
& (1<<MD_SB_CLEAN
))
774 mddev
->recovery_cp
= MaxSector
;
776 if (sb
->events_hi
== sb
->cp_events_hi
&&
777 sb
->events_lo
== sb
->cp_events_lo
) {
778 mddev
->recovery_cp
= sb
->recovery_cp
;
780 mddev
->recovery_cp
= 0;
783 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
784 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
785 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
786 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
788 mddev
->max_disks
= MD_SB_DISKS
;
790 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
791 mddev
->bitmap_file
== NULL
) {
792 if (mddev
->level
!= 1 && mddev
->level
!= 4
793 && mddev
->level
!= 5 && mddev
->level
!= 6
794 && mddev
->level
!= 10) {
795 /* FIXME use a better test */
796 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
799 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
802 } else if (mddev
->pers
== NULL
) {
803 /* Insist on good event counter while assembling */
805 if (ev1
< mddev
->events
)
807 } else if (mddev
->bitmap
) {
808 /* if adding to array with a bitmap, then we can accept an
809 * older device ... but not too old.
811 if (ev1
< mddev
->bitmap
->events_cleared
)
814 if (ev1
< mddev
->events
)
815 /* just a hot-add of a new device, leave raid_disk at -1 */
819 if (mddev
->level
!= LEVEL_MULTIPATH
) {
820 desc
= sb
->disks
+ rdev
->desc_nr
;
822 if (desc
->state
& (1<<MD_DISK_FAULTY
))
823 set_bit(Faulty
, &rdev
->flags
);
824 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
825 desc->raid_disk < mddev->raid_disks */) {
826 set_bit(In_sync
, &rdev
->flags
);
827 rdev
->raid_disk
= desc
->raid_disk
;
829 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
830 set_bit(WriteMostly
, &rdev
->flags
);
831 } else /* MULTIPATH are always insync */
832 set_bit(In_sync
, &rdev
->flags
);
837 * sync_super for 0.90.0
839 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
842 struct list_head
*tmp
;
844 int next_spare
= mddev
->raid_disks
;
847 /* make rdev->sb match mddev data..
850 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
851 * 3/ any empty disks < next_spare become removed
853 * disks[0] gets initialised to REMOVED because
854 * we cannot be sure from other fields if it has
855 * been initialised or not.
858 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
860 rdev
->sb_size
= MD_SB_BYTES
;
862 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
864 memset(sb
, 0, sizeof(*sb
));
866 sb
->md_magic
= MD_SB_MAGIC
;
867 sb
->major_version
= mddev
->major_version
;
868 sb
->patch_version
= mddev
->patch_version
;
869 sb
->gvalid_words
= 0; /* ignored */
870 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
871 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
872 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
873 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
875 sb
->ctime
= mddev
->ctime
;
876 sb
->level
= mddev
->level
;
877 sb
->size
= mddev
->size
;
878 sb
->raid_disks
= mddev
->raid_disks
;
879 sb
->md_minor
= mddev
->md_minor
;
880 sb
->not_persistent
= !mddev
->persistent
;
881 sb
->utime
= mddev
->utime
;
883 sb
->events_hi
= (mddev
->events
>>32);
884 sb
->events_lo
= (u32
)mddev
->events
;
886 if (mddev
->reshape_position
== MaxSector
)
887 sb
->minor_version
= 90;
889 sb
->minor_version
= 91;
890 sb
->reshape_position
= mddev
->reshape_position
;
891 sb
->new_level
= mddev
->new_level
;
892 sb
->delta_disks
= mddev
->delta_disks
;
893 sb
->new_layout
= mddev
->new_layout
;
894 sb
->new_chunk
= mddev
->new_chunk
;
896 mddev
->minor_version
= sb
->minor_version
;
899 sb
->recovery_cp
= mddev
->recovery_cp
;
900 sb
->cp_events_hi
= (mddev
->events
>>32);
901 sb
->cp_events_lo
= (u32
)mddev
->events
;
902 if (mddev
->recovery_cp
== MaxSector
)
903 sb
->state
= (1<< MD_SB_CLEAN
);
907 sb
->layout
= mddev
->layout
;
908 sb
->chunk_size
= mddev
->chunk_size
;
910 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
911 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
913 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
914 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
917 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
918 && !test_bit(Faulty
, &rdev2
->flags
))
919 desc_nr
= rdev2
->raid_disk
;
921 desc_nr
= next_spare
++;
922 rdev2
->desc_nr
= desc_nr
;
923 d
= &sb
->disks
[rdev2
->desc_nr
];
925 d
->number
= rdev2
->desc_nr
;
926 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
927 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
928 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
929 && !test_bit(Faulty
, &rdev2
->flags
))
930 d
->raid_disk
= rdev2
->raid_disk
;
932 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
933 if (test_bit(Faulty
, &rdev2
->flags
))
934 d
->state
= (1<<MD_DISK_FAULTY
);
935 else if (test_bit(In_sync
, &rdev2
->flags
)) {
936 d
->state
= (1<<MD_DISK_ACTIVE
);
937 d
->state
|= (1<<MD_DISK_SYNC
);
945 if (test_bit(WriteMostly
, &rdev2
->flags
))
946 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
948 /* now set the "removed" and "faulty" bits on any missing devices */
949 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
950 mdp_disk_t
*d
= &sb
->disks
[i
];
951 if (d
->state
== 0 && d
->number
== 0) {
954 d
->state
= (1<<MD_DISK_REMOVED
);
955 d
->state
|= (1<<MD_DISK_FAULTY
);
959 sb
->nr_disks
= nr_disks
;
960 sb
->active_disks
= active
;
961 sb
->working_disks
= working
;
962 sb
->failed_disks
= failed
;
963 sb
->spare_disks
= spare
;
965 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
966 sb
->sb_csum
= calc_sb_csum(sb
);
970 * version 1 superblock
973 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
975 unsigned int disk_csum
, csum
;
976 unsigned long long newcsum
;
977 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
978 unsigned int *isuper
= (unsigned int*)sb
;
981 disk_csum
= sb
->sb_csum
;
984 for (i
=0; size
>=4; size
-= 4 )
985 newcsum
+= le32_to_cpu(*isuper
++);
988 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
990 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
991 sb
->sb_csum
= disk_csum
;
992 return cpu_to_le32(csum
);
995 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
997 struct mdp_superblock_1
*sb
;
1000 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1004 * Calculate the position of the superblock.
1005 * It is always aligned to a 4K boundary and
1006 * depeding on minor_version, it can be:
1007 * 0: At least 8K, but less than 12K, from end of device
1008 * 1: At start of device
1009 * 2: 4K from start of device.
1011 switch(minor_version
) {
1013 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1015 sb_offset
&= ~(sector_t
)(4*2-1);
1016 /* convert from sectors to K */
1028 rdev
->sb_offset
= sb_offset
;
1030 /* superblock is rarely larger than 1K, but it can be larger,
1031 * and it is safe to read 4k, so we do that
1033 ret
= read_disk_sb(rdev
, 4096);
1034 if (ret
) return ret
;
1037 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1039 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1040 sb
->major_version
!= cpu_to_le32(1) ||
1041 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1042 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1043 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1046 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1047 printk("md: invalid superblock checksum on %s\n",
1048 bdevname(rdev
->bdev
,b
));
1051 if (le64_to_cpu(sb
->data_size
) < 10) {
1052 printk("md: data_size too small on %s\n",
1053 bdevname(rdev
->bdev
,b
));
1056 rdev
->preferred_minor
= 0xffff;
1057 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1058 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1060 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1061 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1062 if (rdev
->sb_size
& bmask
)
1063 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1065 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1068 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1074 struct mdp_superblock_1
*refsb
=
1075 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1077 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1078 sb
->level
!= refsb
->level
||
1079 sb
->layout
!= refsb
->layout
||
1080 sb
->chunksize
!= refsb
->chunksize
) {
1081 printk(KERN_WARNING
"md: %s has strangely different"
1082 " superblock to %s\n",
1083 bdevname(rdev
->bdev
,b
),
1084 bdevname(refdev
->bdev
,b2
));
1087 ev1
= le64_to_cpu(sb
->events
);
1088 ev2
= le64_to_cpu(refsb
->events
);
1096 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1098 rdev
->size
= rdev
->sb_offset
;
1099 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1101 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1102 if (le32_to_cpu(sb
->chunksize
))
1103 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1105 if (le32_to_cpu(sb
->size
) > rdev
->size
*2)
1110 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1112 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1113 __u64 ev1
= le64_to_cpu(sb
->events
);
1115 rdev
->raid_disk
= -1;
1117 if (mddev
->raid_disks
== 0) {
1118 mddev
->major_version
= 1;
1119 mddev
->patch_version
= 0;
1120 mddev
->persistent
= 1;
1121 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1122 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1123 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1124 mddev
->level
= le32_to_cpu(sb
->level
);
1125 mddev
->clevel
[0] = 0;
1126 mddev
->layout
= le32_to_cpu(sb
->layout
);
1127 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1128 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1129 mddev
->events
= ev1
;
1130 mddev
->bitmap_offset
= 0;
1131 mddev
->default_bitmap_offset
= 1024 >> 9;
1133 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1134 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1136 mddev
->max_disks
= (4096-256)/2;
1138 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1139 mddev
->bitmap_file
== NULL
) {
1140 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
1141 && mddev
->level
!= 10) {
1142 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
1145 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1147 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1148 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1149 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1150 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1151 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1152 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1154 mddev
->reshape_position
= MaxSector
;
1155 mddev
->delta_disks
= 0;
1156 mddev
->new_level
= mddev
->level
;
1157 mddev
->new_layout
= mddev
->layout
;
1158 mddev
->new_chunk
= mddev
->chunk_size
;
1161 } else if (mddev
->pers
== NULL
) {
1162 /* Insist of good event counter while assembling */
1164 if (ev1
< mddev
->events
)
1166 } else if (mddev
->bitmap
) {
1167 /* If adding to array with a bitmap, then we can accept an
1168 * older device, but not too old.
1170 if (ev1
< mddev
->bitmap
->events_cleared
)
1173 if (ev1
< mddev
->events
)
1174 /* just a hot-add of a new device, leave raid_disk at -1 */
1177 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1179 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1181 case 0xffff: /* spare */
1183 case 0xfffe: /* faulty */
1184 set_bit(Faulty
, &rdev
->flags
);
1187 if ((le32_to_cpu(sb
->feature_map
) &
1188 MD_FEATURE_RECOVERY_OFFSET
))
1189 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1191 set_bit(In_sync
, &rdev
->flags
);
1192 rdev
->raid_disk
= role
;
1195 if (sb
->devflags
& WriteMostly1
)
1196 set_bit(WriteMostly
, &rdev
->flags
);
1197 } else /* MULTIPATH are always insync */
1198 set_bit(In_sync
, &rdev
->flags
);
1203 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1205 struct mdp_superblock_1
*sb
;
1206 struct list_head
*tmp
;
1209 /* make rdev->sb match mddev and rdev data. */
1211 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1213 sb
->feature_map
= 0;
1215 sb
->recovery_offset
= cpu_to_le64(0);
1216 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1217 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1218 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1220 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1221 sb
->events
= cpu_to_le64(mddev
->events
);
1223 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1225 sb
->resync_offset
= cpu_to_le64(0);
1227 sb
->cnt_corrected_read
= atomic_read(&rdev
->corrected_errors
);
1229 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1230 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1232 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1233 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1234 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1237 if (rdev
->raid_disk
>= 0 &&
1238 !test_bit(In_sync
, &rdev
->flags
) &&
1239 rdev
->recovery_offset
> 0) {
1240 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1241 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1244 if (mddev
->reshape_position
!= MaxSector
) {
1245 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1246 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1247 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1248 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1249 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1250 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1254 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1255 if (rdev2
->desc_nr
+1 > max_dev
)
1256 max_dev
= rdev2
->desc_nr
+1;
1258 sb
->max_dev
= cpu_to_le32(max_dev
);
1259 for (i
=0; i
<max_dev
;i
++)
1260 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1262 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1264 if (test_bit(Faulty
, &rdev2
->flags
))
1265 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1266 else if (test_bit(In_sync
, &rdev2
->flags
))
1267 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1268 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1269 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1271 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1274 sb
->sb_csum
= calc_sb_1_csum(sb
);
1278 static struct super_type super_types
[] = {
1281 .owner
= THIS_MODULE
,
1282 .load_super
= super_90_load
,
1283 .validate_super
= super_90_validate
,
1284 .sync_super
= super_90_sync
,
1288 .owner
= THIS_MODULE
,
1289 .load_super
= super_1_load
,
1290 .validate_super
= super_1_validate
,
1291 .sync_super
= super_1_sync
,
1295 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1297 struct list_head
*tmp
;
1300 ITERATE_RDEV(mddev
,rdev
,tmp
)
1301 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1307 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1309 struct list_head
*tmp
;
1312 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1313 if (match_dev_unit(mddev2
, rdev
))
1319 static LIST_HEAD(pending_raid_disks
);
1321 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1323 mdk_rdev_t
*same_pdev
;
1324 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1332 /* make sure rdev->size exceeds mddev->size */
1333 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1335 /* Cannot change size, so fail */
1338 mddev
->size
= rdev
->size
;
1340 same_pdev
= match_dev_unit(mddev
, rdev
);
1343 "%s: WARNING: %s appears to be on the same physical"
1344 " disk as %s. True\n protection against single-disk"
1345 " failure might be compromised.\n",
1346 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1347 bdevname(same_pdev
->bdev
,b2
));
1349 /* Verify rdev->desc_nr is unique.
1350 * If it is -1, assign a free number, else
1351 * check number is not in use
1353 if (rdev
->desc_nr
< 0) {
1355 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1356 while (find_rdev_nr(mddev
, choice
))
1358 rdev
->desc_nr
= choice
;
1360 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1363 bdevname(rdev
->bdev
,b
);
1364 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1366 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1369 list_add(&rdev
->same_set
, &mddev
->disks
);
1370 rdev
->mddev
= mddev
;
1371 printk(KERN_INFO
"md: bind<%s>\n", b
);
1373 rdev
->kobj
.parent
= &mddev
->kobj
;
1374 kobject_add(&rdev
->kobj
);
1376 if (rdev
->bdev
->bd_part
)
1377 ko
= &rdev
->bdev
->bd_part
->kobj
;
1379 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1380 sysfs_create_link(&rdev
->kobj
, ko
, "block");
1381 bd_claim_by_disk(rdev
->bdev
, rdev
, mddev
->gendisk
);
1385 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1387 char b
[BDEVNAME_SIZE
];
1392 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1393 list_del_init(&rdev
->same_set
);
1394 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1396 sysfs_remove_link(&rdev
->kobj
, "block");
1397 kobject_del(&rdev
->kobj
);
1401 * prevent the device from being mounted, repartitioned or
1402 * otherwise reused by a RAID array (or any other kernel
1403 * subsystem), by bd_claiming the device.
1405 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1408 struct block_device
*bdev
;
1409 char b
[BDEVNAME_SIZE
];
1411 bdev
= open_partition_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1413 printk(KERN_ERR
"md: could not open %s.\n",
1414 __bdevname(dev
, b
));
1415 return PTR_ERR(bdev
);
1417 err
= bd_claim(bdev
, rdev
);
1419 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1421 blkdev_put_partition(bdev
);
1428 static void unlock_rdev(mdk_rdev_t
*rdev
)
1430 struct block_device
*bdev
= rdev
->bdev
;
1435 blkdev_put_partition(bdev
);
1438 void md_autodetect_dev(dev_t dev
);
1440 static void export_rdev(mdk_rdev_t
* rdev
)
1442 char b
[BDEVNAME_SIZE
];
1443 printk(KERN_INFO
"md: export_rdev(%s)\n",
1444 bdevname(rdev
->bdev
,b
));
1448 list_del_init(&rdev
->same_set
);
1450 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1453 kobject_put(&rdev
->kobj
);
1456 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1458 unbind_rdev_from_array(rdev
);
1462 static void export_array(mddev_t
*mddev
)
1464 struct list_head
*tmp
;
1467 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1472 kick_rdev_from_array(rdev
);
1474 if (!list_empty(&mddev
->disks
))
1476 mddev
->raid_disks
= 0;
1477 mddev
->major_version
= 0;
1480 static void print_desc(mdp_disk_t
*desc
)
1482 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1483 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1486 static void print_sb(mdp_super_t
*sb
)
1491 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1492 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1493 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1495 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1496 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1497 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1498 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1499 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1500 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1501 sb
->failed_disks
, sb
->spare_disks
,
1502 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1505 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1508 desc
= sb
->disks
+ i
;
1509 if (desc
->number
|| desc
->major
|| desc
->minor
||
1510 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1511 printk(" D %2d: ", i
);
1515 printk(KERN_INFO
"md: THIS: ");
1516 print_desc(&sb
->this_disk
);
1520 static void print_rdev(mdk_rdev_t
*rdev
)
1522 char b
[BDEVNAME_SIZE
];
1523 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1524 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1525 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1527 if (rdev
->sb_loaded
) {
1528 printk(KERN_INFO
"md: rdev superblock:\n");
1529 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1531 printk(KERN_INFO
"md: no rdev superblock!\n");
1534 static void md_print_devices(void)
1536 struct list_head
*tmp
, *tmp2
;
1539 char b
[BDEVNAME_SIZE
];
1542 printk("md: **********************************\n");
1543 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1544 printk("md: **********************************\n");
1545 ITERATE_MDDEV(mddev
,tmp
) {
1548 bitmap_print_sb(mddev
->bitmap
);
1550 printk("%s: ", mdname(mddev
));
1551 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1552 printk("<%s>", bdevname(rdev
->bdev
,b
));
1555 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1558 printk("md: **********************************\n");
1563 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1565 /* Update each superblock (in-memory image), but
1566 * if we are allowed to, skip spares which already
1567 * have the right event counter, or have one earlier
1568 * (which would mean they aren't being marked as dirty
1569 * with the rest of the array)
1572 struct list_head
*tmp
;
1574 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1575 if (rdev
->sb_events
== mddev
->events
||
1577 rdev
->raid_disk
< 0 &&
1578 (rdev
->sb_events
&1)==0 &&
1579 rdev
->sb_events
+1 == mddev
->events
)) {
1580 /* Don't update this superblock */
1581 rdev
->sb_loaded
= 2;
1583 super_types
[mddev
->major_version
].
1584 sync_super(mddev
, rdev
);
1585 rdev
->sb_loaded
= 1;
1590 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1593 struct list_head
*tmp
;
1599 spin_lock_irq(&mddev
->write_lock
);
1601 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1602 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1604 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1605 /* just a clean<-> dirty transition, possibly leave spares alone,
1606 * though if events isn't the right even/odd, we will have to do
1612 if (mddev
->degraded
)
1613 /* If the array is degraded, then skipping spares is both
1614 * dangerous and fairly pointless.
1615 * Dangerous because a device that was removed from the array
1616 * might have a event_count that still looks up-to-date,
1617 * so it can be re-added without a resync.
1618 * Pointless because if there are any spares to skip,
1619 * then a recovery will happen and soon that array won't
1620 * be degraded any more and the spare can go back to sleep then.
1624 sync_req
= mddev
->in_sync
;
1625 mddev
->utime
= get_seconds();
1627 /* If this is just a dirty<->clean transition, and the array is clean
1628 * and 'events' is odd, we can roll back to the previous clean state */
1630 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1631 && (mddev
->events
& 1))
1634 /* otherwise we have to go forward and ... */
1636 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1637 /* .. if the array isn't clean, insist on an odd 'events' */
1638 if ((mddev
->events
&1)==0) {
1643 /* otherwise insist on an even 'events' (for clean states) */
1644 if ((mddev
->events
&1)) {
1651 if (!mddev
->events
) {
1653 * oops, this 64-bit counter should never wrap.
1654 * Either we are in around ~1 trillion A.C., assuming
1655 * 1 reboot per second, or we have a bug:
1660 sync_sbs(mddev
, nospares
);
1663 * do not write anything to disk if using
1664 * nonpersistent superblocks
1666 if (!mddev
->persistent
) {
1667 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1668 spin_unlock_irq(&mddev
->write_lock
);
1669 wake_up(&mddev
->sb_wait
);
1672 spin_unlock_irq(&mddev
->write_lock
);
1675 "md: updating %s RAID superblock on device (in sync %d)\n",
1676 mdname(mddev
),mddev
->in_sync
);
1678 err
= bitmap_update_sb(mddev
->bitmap
);
1679 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1680 char b
[BDEVNAME_SIZE
];
1681 dprintk(KERN_INFO
"md: ");
1682 if (rdev
->sb_loaded
!= 1)
1683 continue; /* no noise on spare devices */
1684 if (test_bit(Faulty
, &rdev
->flags
))
1685 dprintk("(skipping faulty ");
1687 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1688 if (!test_bit(Faulty
, &rdev
->flags
)) {
1689 md_super_write(mddev
,rdev
,
1690 rdev
->sb_offset
<<1, rdev
->sb_size
,
1692 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1693 bdevname(rdev
->bdev
,b
),
1694 (unsigned long long)rdev
->sb_offset
);
1695 rdev
->sb_events
= mddev
->events
;
1699 if (mddev
->level
== LEVEL_MULTIPATH
)
1700 /* only need to write one superblock... */
1703 md_super_wait(mddev
);
1704 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1706 spin_lock_irq(&mddev
->write_lock
);
1707 if (mddev
->in_sync
!= sync_req
||
1708 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
1709 /* have to write it out again */
1710 spin_unlock_irq(&mddev
->write_lock
);
1713 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1714 spin_unlock_irq(&mddev
->write_lock
);
1715 wake_up(&mddev
->sb_wait
);
1719 /* words written to sysfs files may, or my not, be \n terminated.
1720 * We want to accept with case. For this we use cmd_match.
1722 static int cmd_match(const char *cmd
, const char *str
)
1724 /* See if cmd, written into a sysfs file, matches
1725 * str. They must either be the same, or cmd can
1726 * have a trailing newline
1728 while (*cmd
&& *str
&& *cmd
== *str
) {
1739 struct rdev_sysfs_entry
{
1740 struct attribute attr
;
1741 ssize_t (*show
)(mdk_rdev_t
*, char *);
1742 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1746 state_show(mdk_rdev_t
*rdev
, char *page
)
1751 if (test_bit(Faulty
, &rdev
->flags
)) {
1752 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1755 if (test_bit(In_sync
, &rdev
->flags
)) {
1756 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1759 if (test_bit(WriteMostly
, &rdev
->flags
)) {
1760 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
1763 if (!test_bit(Faulty
, &rdev
->flags
) &&
1764 !test_bit(In_sync
, &rdev
->flags
)) {
1765 len
+= sprintf(page
+len
, "%sspare", sep
);
1768 return len
+sprintf(page
+len
, "\n");
1772 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1775 * faulty - simulates and error
1776 * remove - disconnects the device
1777 * writemostly - sets write_mostly
1778 * -writemostly - clears write_mostly
1781 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1782 md_error(rdev
->mddev
, rdev
);
1784 } else if (cmd_match(buf
, "remove")) {
1785 if (rdev
->raid_disk
>= 0)
1788 mddev_t
*mddev
= rdev
->mddev
;
1789 kick_rdev_from_array(rdev
);
1790 md_update_sb(mddev
, 1);
1791 md_new_event(mddev
);
1794 } else if (cmd_match(buf
, "writemostly")) {
1795 set_bit(WriteMostly
, &rdev
->flags
);
1797 } else if (cmd_match(buf
, "-writemostly")) {
1798 clear_bit(WriteMostly
, &rdev
->flags
);
1801 return err
? err
: len
;
1803 static struct rdev_sysfs_entry rdev_state
=
1804 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
1807 super_show(mdk_rdev_t
*rdev
, char *page
)
1809 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1810 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1811 return rdev
->sb_size
;
1815 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1818 errors_show(mdk_rdev_t
*rdev
, char *page
)
1820 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1824 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1827 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1828 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1829 atomic_set(&rdev
->corrected_errors
, n
);
1834 static struct rdev_sysfs_entry rdev_errors
=
1835 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
1838 slot_show(mdk_rdev_t
*rdev
, char *page
)
1840 if (rdev
->raid_disk
< 0)
1841 return sprintf(page
, "none\n");
1843 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1847 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1850 int slot
= simple_strtoul(buf
, &e
, 10);
1851 if (strncmp(buf
, "none", 4)==0)
1853 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1855 if (rdev
->mddev
->pers
)
1856 /* Cannot set slot in active array (yet) */
1858 if (slot
>= rdev
->mddev
->raid_disks
)
1860 rdev
->raid_disk
= slot
;
1861 /* assume it is working */
1863 set_bit(In_sync
, &rdev
->flags
);
1868 static struct rdev_sysfs_entry rdev_slot
=
1869 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
1872 offset_show(mdk_rdev_t
*rdev
, char *page
)
1874 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1878 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1881 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1882 if (e
==buf
|| (*e
&& *e
!= '\n'))
1884 if (rdev
->mddev
->pers
)
1886 rdev
->data_offset
= offset
;
1890 static struct rdev_sysfs_entry rdev_offset
=
1891 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
1894 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1896 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1900 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1903 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1904 if (e
==buf
|| (*e
&& *e
!= '\n'))
1906 if (rdev
->mddev
->pers
)
1909 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1910 rdev
->mddev
->size
= size
;
1914 static struct rdev_sysfs_entry rdev_size
=
1915 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
1917 static struct attribute
*rdev_default_attrs
[] = {
1927 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1929 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1930 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1934 return entry
->show(rdev
, page
);
1938 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1939 const char *page
, size_t length
)
1941 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1942 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1946 if (!capable(CAP_SYS_ADMIN
))
1948 return entry
->store(rdev
, page
, length
);
1951 static void rdev_free(struct kobject
*ko
)
1953 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1956 static struct sysfs_ops rdev_sysfs_ops
= {
1957 .show
= rdev_attr_show
,
1958 .store
= rdev_attr_store
,
1960 static struct kobj_type rdev_ktype
= {
1961 .release
= rdev_free
,
1962 .sysfs_ops
= &rdev_sysfs_ops
,
1963 .default_attrs
= rdev_default_attrs
,
1967 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1969 * mark the device faulty if:
1971 * - the device is nonexistent (zero size)
1972 * - the device has no valid superblock
1974 * a faulty rdev _never_ has rdev->sb set.
1976 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1978 char b
[BDEVNAME_SIZE
];
1983 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
1985 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1986 return ERR_PTR(-ENOMEM
);
1989 if ((err
= alloc_disk_sb(rdev
)))
1992 err
= lock_rdev(rdev
, newdev
);
1996 rdev
->kobj
.parent
= NULL
;
1997 rdev
->kobj
.ktype
= &rdev_ktype
;
1998 kobject_init(&rdev
->kobj
);
2002 rdev
->data_offset
= 0;
2003 rdev
->sb_events
= 0;
2004 atomic_set(&rdev
->nr_pending
, 0);
2005 atomic_set(&rdev
->read_errors
, 0);
2006 atomic_set(&rdev
->corrected_errors
, 0);
2008 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2011 "md: %s has zero or unknown size, marking faulty!\n",
2012 bdevname(rdev
->bdev
,b
));
2017 if (super_format
>= 0) {
2018 err
= super_types
[super_format
].
2019 load_super(rdev
, NULL
, super_minor
);
2020 if (err
== -EINVAL
) {
2022 "md: %s has invalid sb, not importing!\n",
2023 bdevname(rdev
->bdev
,b
));
2028 "md: could not read %s's sb, not importing!\n",
2029 bdevname(rdev
->bdev
,b
));
2033 INIT_LIST_HEAD(&rdev
->same_set
);
2038 if (rdev
->sb_page
) {
2044 return ERR_PTR(err
);
2048 * Check a full RAID array for plausibility
2052 static void analyze_sbs(mddev_t
* mddev
)
2055 struct list_head
*tmp
;
2056 mdk_rdev_t
*rdev
, *freshest
;
2057 char b
[BDEVNAME_SIZE
];
2060 ITERATE_RDEV(mddev
,rdev
,tmp
)
2061 switch (super_types
[mddev
->major_version
].
2062 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2070 "md: fatal superblock inconsistency in %s"
2071 " -- removing from array\n",
2072 bdevname(rdev
->bdev
,b
));
2073 kick_rdev_from_array(rdev
);
2077 super_types
[mddev
->major_version
].
2078 validate_super(mddev
, freshest
);
2081 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2082 if (rdev
!= freshest
)
2083 if (super_types
[mddev
->major_version
].
2084 validate_super(mddev
, rdev
)) {
2085 printk(KERN_WARNING
"md: kicking non-fresh %s"
2087 bdevname(rdev
->bdev
,b
));
2088 kick_rdev_from_array(rdev
);
2091 if (mddev
->level
== LEVEL_MULTIPATH
) {
2092 rdev
->desc_nr
= i
++;
2093 rdev
->raid_disk
= rdev
->desc_nr
;
2094 set_bit(In_sync
, &rdev
->flags
);
2100 if (mddev
->recovery_cp
!= MaxSector
&&
2102 printk(KERN_ERR
"md: %s: raid array is not clean"
2103 " -- starting background reconstruction\n",
2109 safe_delay_show(mddev_t
*mddev
, char *page
)
2111 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2112 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2115 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2123 /* remove a period, and count digits after it */
2124 if (len
>= sizeof(buf
))
2126 strlcpy(buf
, cbuf
, len
);
2128 for (i
=0; i
<len
; i
++) {
2130 if (isdigit(buf
[i
])) {
2135 } else if (buf
[i
] == '.') {
2140 msec
= simple_strtoul(buf
, &e
, 10);
2141 if (e
== buf
|| (*e
&& *e
!= '\n'))
2143 msec
= (msec
* 1000) / scale
;
2145 mddev
->safemode_delay
= 0;
2147 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2148 if (mddev
->safemode_delay
== 0)
2149 mddev
->safemode_delay
= 1;
2153 static struct md_sysfs_entry md_safe_delay
=
2154 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2157 level_show(mddev_t
*mddev
, char *page
)
2159 struct mdk_personality
*p
= mddev
->pers
;
2161 return sprintf(page
, "%s\n", p
->name
);
2162 else if (mddev
->clevel
[0])
2163 return sprintf(page
, "%s\n", mddev
->clevel
);
2164 else if (mddev
->level
!= LEVEL_NONE
)
2165 return sprintf(page
, "%d\n", mddev
->level
);
2171 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2178 if (len
>= sizeof(mddev
->clevel
))
2180 strncpy(mddev
->clevel
, buf
, len
);
2181 if (mddev
->clevel
[len
-1] == '\n')
2183 mddev
->clevel
[len
] = 0;
2184 mddev
->level
= LEVEL_NONE
;
2188 static struct md_sysfs_entry md_level
=
2189 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2193 layout_show(mddev_t
*mddev
, char *page
)
2195 /* just a number, not meaningful for all levels */
2196 return sprintf(page
, "%d\n", mddev
->layout
);
2200 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2203 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2207 if (!*buf
|| (*e
&& *e
!= '\n'))
2213 static struct md_sysfs_entry md_layout
=
2214 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2218 raid_disks_show(mddev_t
*mddev
, char *page
)
2220 if (mddev
->raid_disks
== 0)
2222 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2225 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2228 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2230 /* can only set raid_disks if array is not yet active */
2233 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2235 if (!*buf
|| (*e
&& *e
!= '\n'))
2239 rv
= update_raid_disks(mddev
, n
);
2241 mddev
->raid_disks
= n
;
2242 return rv
? rv
: len
;
2244 static struct md_sysfs_entry md_raid_disks
=
2245 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2248 chunk_size_show(mddev_t
*mddev
, char *page
)
2250 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2254 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2256 /* can only set chunk_size if array is not yet active */
2258 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2262 if (!*buf
|| (*e
&& *e
!= '\n'))
2265 mddev
->chunk_size
= n
;
2268 static struct md_sysfs_entry md_chunk_size
=
2269 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2272 resync_start_show(mddev_t
*mddev
, char *page
)
2274 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2278 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2280 /* can only set chunk_size if array is not yet active */
2282 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2286 if (!*buf
|| (*e
&& *e
!= '\n'))
2289 mddev
->recovery_cp
= n
;
2292 static struct md_sysfs_entry md_resync_start
=
2293 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2296 * The array state can be:
2299 * No devices, no size, no level
2300 * Equivalent to STOP_ARRAY ioctl
2302 * May have some settings, but array is not active
2303 * all IO results in error
2304 * When written, doesn't tear down array, but just stops it
2305 * suspended (not supported yet)
2306 * All IO requests will block. The array can be reconfigured.
2307 * Writing this, if accepted, will block until array is quiessent
2309 * no resync can happen. no superblocks get written.
2310 * write requests fail
2312 * like readonly, but behaves like 'clean' on a write request.
2314 * clean - no pending writes, but otherwise active.
2315 * When written to inactive array, starts without resync
2316 * If a write request arrives then
2317 * if metadata is known, mark 'dirty' and switch to 'active'.
2318 * if not known, block and switch to write-pending
2319 * If written to an active array that has pending writes, then fails.
2321 * fully active: IO and resync can be happening.
2322 * When written to inactive array, starts with resync
2325 * clean, but writes are blocked waiting for 'active' to be written.
2328 * like active, but no writes have been seen for a while (100msec).
2331 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2332 write_pending
, active_idle
, bad_word
};
2333 static char *array_states
[] = {
2334 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2335 "write-pending", "active-idle", NULL
};
2337 static int match_word(const char *word
, char **list
)
2340 for (n
=0; list
[n
]; n
++)
2341 if (cmd_match(word
, list
[n
]))
2347 array_state_show(mddev_t
*mddev
, char *page
)
2349 enum array_state st
= inactive
;
2362 else if (mddev
->safemode
)
2368 if (list_empty(&mddev
->disks
) &&
2369 mddev
->raid_disks
== 0 &&
2375 return sprintf(page
, "%s\n", array_states
[st
]);
2378 static int do_md_stop(mddev_t
* mddev
, int ro
);
2379 static int do_md_run(mddev_t
* mddev
);
2380 static int restart_array(mddev_t
*mddev
);
2383 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2386 enum array_state st
= match_word(buf
, array_states
);
2391 /* stopping an active array */
2393 if (atomic_read(&mddev
->active
) > 1)
2395 err
= do_md_stop(mddev
, 0);
2399 /* stopping an active array */
2401 if (atomic_read(&mddev
->active
) > 1)
2403 err
= do_md_stop(mddev
, 2);
2407 break; /* not supported yet */
2410 err
= do_md_stop(mddev
, 1);
2413 err
= do_md_run(mddev
);
2417 /* stopping an active array */
2419 err
= do_md_stop(mddev
, 1);
2421 mddev
->ro
= 2; /* FIXME mark devices writable */
2424 err
= do_md_run(mddev
);
2429 restart_array(mddev
);
2430 spin_lock_irq(&mddev
->write_lock
);
2431 if (atomic_read(&mddev
->writes_pending
) == 0) {
2433 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2435 spin_unlock_irq(&mddev
->write_lock
);
2438 mddev
->recovery_cp
= MaxSector
;
2439 err
= do_md_run(mddev
);
2444 restart_array(mddev
);
2445 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2446 wake_up(&mddev
->sb_wait
);
2450 err
= do_md_run(mddev
);
2455 /* these cannot be set */
2463 static struct md_sysfs_entry md_array_state
=
2464 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
2467 null_show(mddev_t
*mddev
, char *page
)
2473 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2475 /* buf must be %d:%d\n? giving major and minor numbers */
2476 /* The new device is added to the array.
2477 * If the array has a persistent superblock, we read the
2478 * superblock to initialise info and check validity.
2479 * Otherwise, only checking done is that in bind_rdev_to_array,
2480 * which mainly checks size.
2483 int major
= simple_strtoul(buf
, &e
, 10);
2489 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2491 minor
= simple_strtoul(e
+1, &e
, 10);
2492 if (*e
&& *e
!= '\n')
2494 dev
= MKDEV(major
, minor
);
2495 if (major
!= MAJOR(dev
) ||
2496 minor
!= MINOR(dev
))
2500 if (mddev
->persistent
) {
2501 rdev
= md_import_device(dev
, mddev
->major_version
,
2502 mddev
->minor_version
);
2503 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2504 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2505 mdk_rdev_t
, same_set
);
2506 err
= super_types
[mddev
->major_version
]
2507 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2512 rdev
= md_import_device(dev
, -1, -1);
2515 return PTR_ERR(rdev
);
2516 err
= bind_rdev_to_array(rdev
, mddev
);
2520 return err
? err
: len
;
2523 static struct md_sysfs_entry md_new_device
=
2524 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
2527 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2530 unsigned long chunk
, end_chunk
;
2534 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2536 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
2537 if (buf
== end
) break;
2538 if (*end
== '-') { /* range */
2540 end_chunk
= simple_strtoul(buf
, &end
, 0);
2541 if (buf
== end
) break;
2543 if (*end
&& !isspace(*end
)) break;
2544 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
2546 while (isspace(*buf
)) buf
++;
2548 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
2553 static struct md_sysfs_entry md_bitmap
=
2554 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
2557 size_show(mddev_t
*mddev
, char *page
)
2559 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2562 static int update_size(mddev_t
*mddev
, unsigned long size
);
2565 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2567 /* If array is inactive, we can reduce the component size, but
2568 * not increase it (except from 0).
2569 * If array is active, we can try an on-line resize
2573 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2574 if (!*buf
|| *buf
== '\n' ||
2579 err
= update_size(mddev
, size
);
2580 md_update_sb(mddev
, 1);
2582 if (mddev
->size
== 0 ||
2588 return err
? err
: len
;
2591 static struct md_sysfs_entry md_size
=
2592 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
2596 * This is either 'none' for arrays with externally managed metadata,
2597 * or N.M for internally known formats
2600 metadata_show(mddev_t
*mddev
, char *page
)
2602 if (mddev
->persistent
)
2603 return sprintf(page
, "%d.%d\n",
2604 mddev
->major_version
, mddev
->minor_version
);
2606 return sprintf(page
, "none\n");
2610 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2614 if (!list_empty(&mddev
->disks
))
2617 if (cmd_match(buf
, "none")) {
2618 mddev
->persistent
= 0;
2619 mddev
->major_version
= 0;
2620 mddev
->minor_version
= 90;
2623 major
= simple_strtoul(buf
, &e
, 10);
2624 if (e
==buf
|| *e
!= '.')
2627 minor
= simple_strtoul(buf
, &e
, 10);
2628 if (e
==buf
|| *e
!= '\n')
2630 if (major
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2631 super_types
[major
].name
== NULL
)
2633 mddev
->major_version
= major
;
2634 mddev
->minor_version
= minor
;
2635 mddev
->persistent
= 1;
2639 static struct md_sysfs_entry md_metadata
=
2640 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
2643 action_show(mddev_t
*mddev
, char *page
)
2645 char *type
= "idle";
2646 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2647 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2648 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2650 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2651 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2653 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2660 return sprintf(page
, "%s\n", type
);
2664 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2666 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2669 if (cmd_match(page
, "idle")) {
2670 if (mddev
->sync_thread
) {
2671 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2672 md_unregister_thread(mddev
->sync_thread
);
2673 mddev
->sync_thread
= NULL
;
2674 mddev
->recovery
= 0;
2676 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2677 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2679 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2680 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2681 else if (cmd_match(page
, "reshape")) {
2683 if (mddev
->pers
->start_reshape
== NULL
)
2685 err
= mddev
->pers
->start_reshape(mddev
);
2689 if (cmd_match(page
, "check"))
2690 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2691 else if (!cmd_match(page
, "repair"))
2693 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2694 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2696 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2697 md_wakeup_thread(mddev
->thread
);
2702 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2704 return sprintf(page
, "%llu\n",
2705 (unsigned long long) mddev
->resync_mismatches
);
2708 static struct md_sysfs_entry md_scan_mode
=
2709 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2712 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
2715 sync_min_show(mddev_t
*mddev
, char *page
)
2717 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2718 mddev
->sync_speed_min
? "local": "system");
2722 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2726 if (strncmp(buf
, "system", 6)==0) {
2727 mddev
->sync_speed_min
= 0;
2730 min
= simple_strtoul(buf
, &e
, 10);
2731 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2733 mddev
->sync_speed_min
= min
;
2737 static struct md_sysfs_entry md_sync_min
=
2738 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2741 sync_max_show(mddev_t
*mddev
, char *page
)
2743 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2744 mddev
->sync_speed_max
? "local": "system");
2748 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2752 if (strncmp(buf
, "system", 6)==0) {
2753 mddev
->sync_speed_max
= 0;
2756 max
= simple_strtoul(buf
, &e
, 10);
2757 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2759 mddev
->sync_speed_max
= max
;
2763 static struct md_sysfs_entry md_sync_max
=
2764 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2768 sync_speed_show(mddev_t
*mddev
, char *page
)
2770 unsigned long resync
, dt
, db
;
2771 resync
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
));
2772 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2774 db
= resync
- (mddev
->resync_mark_cnt
);
2775 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2778 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
2781 sync_completed_show(mddev_t
*mddev
, char *page
)
2783 unsigned long max_blocks
, resync
;
2785 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2786 max_blocks
= mddev
->resync_max_sectors
;
2788 max_blocks
= mddev
->size
<< 1;
2790 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2791 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2794 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
2797 suspend_lo_show(mddev_t
*mddev
, char *page
)
2799 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
2803 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2806 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2808 if (mddev
->pers
->quiesce
== NULL
)
2810 if (buf
== e
|| (*e
&& *e
!= '\n'))
2812 if (new >= mddev
->suspend_hi
||
2813 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
2814 mddev
->suspend_lo
= new;
2815 mddev
->pers
->quiesce(mddev
, 2);
2820 static struct md_sysfs_entry md_suspend_lo
=
2821 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
2825 suspend_hi_show(mddev_t
*mddev
, char *page
)
2827 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
2831 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2834 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2836 if (mddev
->pers
->quiesce
== NULL
)
2838 if (buf
== e
|| (*e
&& *e
!= '\n'))
2840 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
2841 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
2842 mddev
->suspend_hi
= new;
2843 mddev
->pers
->quiesce(mddev
, 1);
2844 mddev
->pers
->quiesce(mddev
, 0);
2849 static struct md_sysfs_entry md_suspend_hi
=
2850 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
2853 static struct attribute
*md_default_attrs
[] = {
2856 &md_raid_disks
.attr
,
2857 &md_chunk_size
.attr
,
2859 &md_resync_start
.attr
,
2861 &md_new_device
.attr
,
2862 &md_safe_delay
.attr
,
2863 &md_array_state
.attr
,
2867 static struct attribute
*md_redundancy_attrs
[] = {
2869 &md_mismatches
.attr
,
2872 &md_sync_speed
.attr
,
2873 &md_sync_completed
.attr
,
2874 &md_suspend_lo
.attr
,
2875 &md_suspend_hi
.attr
,
2879 static struct attribute_group md_redundancy_group
= {
2881 .attrs
= md_redundancy_attrs
,
2886 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2888 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2889 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2894 rv
= mddev_lock(mddev
);
2896 rv
= entry
->show(mddev
, page
);
2897 mddev_unlock(mddev
);
2903 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2904 const char *page
, size_t length
)
2906 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2907 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2912 if (!capable(CAP_SYS_ADMIN
))
2914 rv
= mddev_lock(mddev
);
2916 rv
= entry
->store(mddev
, page
, length
);
2917 mddev_unlock(mddev
);
2922 static void md_free(struct kobject
*ko
)
2924 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
2928 static struct sysfs_ops md_sysfs_ops
= {
2929 .show
= md_attr_show
,
2930 .store
= md_attr_store
,
2932 static struct kobj_type md_ktype
= {
2934 .sysfs_ops
= &md_sysfs_ops
,
2935 .default_attrs
= md_default_attrs
,
2940 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
2942 static DEFINE_MUTEX(disks_mutex
);
2943 mddev_t
*mddev
= mddev_find(dev
);
2944 struct gendisk
*disk
;
2945 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
2946 int shift
= partitioned
? MdpMinorShift
: 0;
2947 int unit
= MINOR(dev
) >> shift
;
2952 mutex_lock(&disks_mutex
);
2953 if (mddev
->gendisk
) {
2954 mutex_unlock(&disks_mutex
);
2958 disk
= alloc_disk(1 << shift
);
2960 mutex_unlock(&disks_mutex
);
2964 disk
->major
= MAJOR(dev
);
2965 disk
->first_minor
= unit
<< shift
;
2967 sprintf(disk
->disk_name
, "md_d%d", unit
);
2969 sprintf(disk
->disk_name
, "md%d", unit
);
2970 disk
->fops
= &md_fops
;
2971 disk
->private_data
= mddev
;
2972 disk
->queue
= mddev
->queue
;
2974 mddev
->gendisk
= disk
;
2975 mutex_unlock(&disks_mutex
);
2976 mddev
->kobj
.parent
= &disk
->kobj
;
2977 mddev
->kobj
.k_name
= NULL
;
2978 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
2979 mddev
->kobj
.ktype
= &md_ktype
;
2980 kobject_register(&mddev
->kobj
);
2984 static void md_safemode_timeout(unsigned long data
)
2986 mddev_t
*mddev
= (mddev_t
*) data
;
2988 mddev
->safemode
= 1;
2989 md_wakeup_thread(mddev
->thread
);
2992 static int start_dirty_degraded
;
2994 static int do_md_run(mddev_t
* mddev
)
2998 struct list_head
*tmp
;
3000 struct gendisk
*disk
;
3001 struct mdk_personality
*pers
;
3002 char b
[BDEVNAME_SIZE
];
3004 if (list_empty(&mddev
->disks
))
3005 /* cannot run an array with no devices.. */
3012 * Analyze all RAID superblock(s)
3014 if (!mddev
->raid_disks
)
3017 chunk_size
= mddev
->chunk_size
;
3020 if (chunk_size
> MAX_CHUNK_SIZE
) {
3021 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3022 chunk_size
, MAX_CHUNK_SIZE
);
3026 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3028 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3029 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
3032 if (chunk_size
< PAGE_SIZE
) {
3033 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
3034 chunk_size
, PAGE_SIZE
);
3038 /* devices must have minimum size of one chunk */
3039 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3040 if (test_bit(Faulty
, &rdev
->flags
))
3042 if (rdev
->size
< chunk_size
/ 1024) {
3044 "md: Dev %s smaller than chunk_size:"
3046 bdevname(rdev
->bdev
,b
),
3047 (unsigned long long)rdev
->size
,
3055 if (mddev
->level
!= LEVEL_NONE
)
3056 request_module("md-level-%d", mddev
->level
);
3057 else if (mddev
->clevel
[0])
3058 request_module("md-%s", mddev
->clevel
);
3062 * Drop all container device buffers, from now on
3063 * the only valid external interface is through the md
3065 * Also find largest hardsector size
3067 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3068 if (test_bit(Faulty
, &rdev
->flags
))
3070 sync_blockdev(rdev
->bdev
);
3071 invalidate_bdev(rdev
->bdev
, 0);
3074 md_probe(mddev
->unit
, NULL
, NULL
);
3075 disk
= mddev
->gendisk
;
3079 spin_lock(&pers_lock
);
3080 pers
= find_pers(mddev
->level
, mddev
->clevel
);
3081 if (!pers
|| !try_module_get(pers
->owner
)) {
3082 spin_unlock(&pers_lock
);
3083 if (mddev
->level
!= LEVEL_NONE
)
3084 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3087 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3092 spin_unlock(&pers_lock
);
3093 mddev
->level
= pers
->level
;
3094 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3096 if (mddev
->reshape_position
!= MaxSector
&&
3097 pers
->start_reshape
== NULL
) {
3098 /* This personality cannot handle reshaping... */
3100 module_put(pers
->owner
);
3104 mddev
->recovery
= 0;
3105 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3106 mddev
->barriers_work
= 1;
3107 mddev
->ok_start_degraded
= start_dirty_degraded
;
3110 mddev
->ro
= 2; /* read-only, but switch on first write */
3112 err
= mddev
->pers
->run(mddev
);
3113 if (!err
&& mddev
->pers
->sync_request
) {
3114 err
= bitmap_create(mddev
);
3116 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3117 mdname(mddev
), err
);
3118 mddev
->pers
->stop(mddev
);
3122 printk(KERN_ERR
"md: pers->run() failed ...\n");
3123 module_put(mddev
->pers
->owner
);
3125 bitmap_destroy(mddev
);
3128 if (mddev
->pers
->sync_request
)
3129 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
);
3130 else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3133 atomic_set(&mddev
->writes_pending
,0);
3134 mddev
->safemode
= 0;
3135 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3136 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3137 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3140 ITERATE_RDEV(mddev
,rdev
,tmp
)
3141 if (rdev
->raid_disk
>= 0) {
3143 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3144 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
3147 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3150 md_update_sb(mddev
, 0);
3152 set_capacity(disk
, mddev
->array_size
<<1);
3154 /* If we call blk_queue_make_request here, it will
3155 * re-initialise max_sectors etc which may have been
3156 * refined inside -> run. So just set the bits we need to set.
3157 * Most initialisation happended when we called
3158 * blk_queue_make_request(..., md_fail_request)
3161 mddev
->queue
->queuedata
= mddev
;
3162 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3164 /* If there is a partially-recovered drive we need to
3165 * start recovery here. If we leave it to md_check_recovery,
3166 * it will remove the drives and not do the right thing
3168 if (mddev
->degraded
&& !mddev
->sync_thread
) {
3169 struct list_head
*rtmp
;
3171 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3172 if (rdev
->raid_disk
>= 0 &&
3173 !test_bit(In_sync
, &rdev
->flags
) &&
3174 !test_bit(Faulty
, &rdev
->flags
))
3175 /* complete an interrupted recovery */
3177 if (spares
&& mddev
->pers
->sync_request
) {
3178 mddev
->recovery
= 0;
3179 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3180 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3183 if (!mddev
->sync_thread
) {
3184 printk(KERN_ERR
"%s: could not start resync"
3187 /* leave the spares where they are, it shouldn't hurt */
3188 mddev
->recovery
= 0;
3192 md_wakeup_thread(mddev
->thread
);
3193 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
3196 md_new_event(mddev
);
3200 static int restart_array(mddev_t
*mddev
)
3202 struct gendisk
*disk
= mddev
->gendisk
;
3206 * Complain if it has no devices
3209 if (list_empty(&mddev
->disks
))
3217 mddev
->safemode
= 0;
3219 set_disk_ro(disk
, 0);
3221 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3224 * Kick recovery or resync if necessary
3226 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3227 md_wakeup_thread(mddev
->thread
);
3228 md_wakeup_thread(mddev
->sync_thread
);
3237 /* similar to deny_write_access, but accounts for our holding a reference
3238 * to the file ourselves */
3239 static int deny_bitmap_write_access(struct file
* file
)
3241 struct inode
*inode
= file
->f_mapping
->host
;
3243 spin_lock(&inode
->i_lock
);
3244 if (atomic_read(&inode
->i_writecount
) > 1) {
3245 spin_unlock(&inode
->i_lock
);
3248 atomic_set(&inode
->i_writecount
, -1);
3249 spin_unlock(&inode
->i_lock
);
3254 static void restore_bitmap_write_access(struct file
*file
)
3256 struct inode
*inode
= file
->f_mapping
->host
;
3258 spin_lock(&inode
->i_lock
);
3259 atomic_set(&inode
->i_writecount
, 1);
3260 spin_unlock(&inode
->i_lock
);
3264 * 0 - completely stop and dis-assemble array
3265 * 1 - switch to readonly
3266 * 2 - stop but do not disassemble array
3268 static int do_md_stop(mddev_t
* mddev
, int mode
)
3271 struct gendisk
*disk
= mddev
->gendisk
;
3274 if (atomic_read(&mddev
->active
)>2) {
3275 printk("md: %s still in use.\n",mdname(mddev
));
3279 if (mddev
->sync_thread
) {
3280 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3281 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3282 md_unregister_thread(mddev
->sync_thread
);
3283 mddev
->sync_thread
= NULL
;
3286 del_timer_sync(&mddev
->safemode_timer
);
3288 invalidate_partition(disk
, 0);
3291 case 1: /* readonly */
3297 case 0: /* disassemble */
3299 bitmap_flush(mddev
);
3300 md_super_wait(mddev
);
3302 set_disk_ro(disk
, 0);
3303 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3304 mddev
->pers
->stop(mddev
);
3305 if (mddev
->pers
->sync_request
)
3306 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3308 module_put(mddev
->pers
->owner
);
3313 if (!mddev
->in_sync
|| mddev
->flags
) {
3314 /* mark array as shutdown cleanly */
3316 md_update_sb(mddev
, 1);
3319 set_disk_ro(disk
, 1);
3320 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3324 * Free resources if final stop
3328 struct list_head
*tmp
;
3329 struct gendisk
*disk
;
3330 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3332 bitmap_destroy(mddev
);
3333 if (mddev
->bitmap_file
) {
3334 restore_bitmap_write_access(mddev
->bitmap_file
);
3335 fput(mddev
->bitmap_file
);
3336 mddev
->bitmap_file
= NULL
;
3338 mddev
->bitmap_offset
= 0;
3340 ITERATE_RDEV(mddev
,rdev
,tmp
)
3341 if (rdev
->raid_disk
>= 0) {
3343 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3344 sysfs_remove_link(&mddev
->kobj
, nm
);
3347 export_array(mddev
);
3349 mddev
->array_size
= 0;
3351 mddev
->raid_disks
= 0;
3352 mddev
->recovery_cp
= 0;
3354 disk
= mddev
->gendisk
;
3356 set_capacity(disk
, 0);
3358 } else if (mddev
->pers
)
3359 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3362 md_new_event(mddev
);
3367 static void autorun_array(mddev_t
*mddev
)
3370 struct list_head
*tmp
;
3373 if (list_empty(&mddev
->disks
))
3376 printk(KERN_INFO
"md: running: ");
3378 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3379 char b
[BDEVNAME_SIZE
];
3380 printk("<%s>", bdevname(rdev
->bdev
,b
));
3384 err
= do_md_run (mddev
);
3386 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3387 do_md_stop (mddev
, 0);
3392 * lets try to run arrays based on all disks that have arrived
3393 * until now. (those are in pending_raid_disks)
3395 * the method: pick the first pending disk, collect all disks with
3396 * the same UUID, remove all from the pending list and put them into
3397 * the 'same_array' list. Then order this list based on superblock
3398 * update time (freshest comes first), kick out 'old' disks and
3399 * compare superblocks. If everything's fine then run it.
3401 * If "unit" is allocated, then bump its reference count
3403 static void autorun_devices(int part
)
3405 struct list_head
*tmp
;
3406 mdk_rdev_t
*rdev0
, *rdev
;
3408 char b
[BDEVNAME_SIZE
];
3410 printk(KERN_INFO
"md: autorun ...\n");
3411 while (!list_empty(&pending_raid_disks
)) {
3413 LIST_HEAD(candidates
);
3414 rdev0
= list_entry(pending_raid_disks
.next
,
3415 mdk_rdev_t
, same_set
);
3417 printk(KERN_INFO
"md: considering %s ...\n",
3418 bdevname(rdev0
->bdev
,b
));
3419 INIT_LIST_HEAD(&candidates
);
3420 ITERATE_RDEV_PENDING(rdev
,tmp
)
3421 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3422 printk(KERN_INFO
"md: adding %s ...\n",
3423 bdevname(rdev
->bdev
,b
));
3424 list_move(&rdev
->same_set
, &candidates
);
3427 * now we have a set of devices, with all of them having
3428 * mostly sane superblocks. It's time to allocate the
3431 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
3432 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
3433 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
3437 dev
= MKDEV(mdp_major
,
3438 rdev0
->preferred_minor
<< MdpMinorShift
);
3440 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
3442 md_probe(dev
, NULL
, NULL
);
3443 mddev
= mddev_find(dev
);
3446 "md: cannot allocate memory for md drive.\n");
3449 if (mddev_lock(mddev
))
3450 printk(KERN_WARNING
"md: %s locked, cannot run\n",
3452 else if (mddev
->raid_disks
|| mddev
->major_version
3453 || !list_empty(&mddev
->disks
)) {
3455 "md: %s already running, cannot run %s\n",
3456 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
3457 mddev_unlock(mddev
);
3459 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
3460 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
3461 list_del_init(&rdev
->same_set
);
3462 if (bind_rdev_to_array(rdev
, mddev
))
3465 autorun_array(mddev
);
3466 mddev_unlock(mddev
);
3468 /* on success, candidates will be empty, on error
3471 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
3475 printk(KERN_INFO
"md: ... autorun DONE.\n");
3478 static int get_version(void __user
* arg
)
3482 ver
.major
= MD_MAJOR_VERSION
;
3483 ver
.minor
= MD_MINOR_VERSION
;
3484 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3486 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3492 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3494 mdu_array_info_t info
;
3495 int nr
,working
,active
,failed
,spare
;
3497 struct list_head
*tmp
;
3499 nr
=working
=active
=failed
=spare
=0;
3500 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3502 if (test_bit(Faulty
, &rdev
->flags
))
3506 if (test_bit(In_sync
, &rdev
->flags
))
3513 info
.major_version
= mddev
->major_version
;
3514 info
.minor_version
= mddev
->minor_version
;
3515 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3516 info
.ctime
= mddev
->ctime
;
3517 info
.level
= mddev
->level
;
3518 info
.size
= mddev
->size
;
3519 if (info
.size
!= mddev
->size
) /* overflow */
3522 info
.raid_disks
= mddev
->raid_disks
;
3523 info
.md_minor
= mddev
->md_minor
;
3524 info
.not_persistent
= !mddev
->persistent
;
3526 info
.utime
= mddev
->utime
;
3529 info
.state
= (1<<MD_SB_CLEAN
);
3530 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3531 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3532 info
.active_disks
= active
;
3533 info
.working_disks
= working
;
3534 info
.failed_disks
= failed
;
3535 info
.spare_disks
= spare
;
3537 info
.layout
= mddev
->layout
;
3538 info
.chunk_size
= mddev
->chunk_size
;
3540 if (copy_to_user(arg
, &info
, sizeof(info
)))
3546 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3548 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3549 char *ptr
, *buf
= NULL
;
3552 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3556 /* bitmap disabled, zero the first byte and copy out */
3557 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3558 file
->pathname
[0] = '\0';
3562 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3566 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3570 strcpy(file
->pathname
, ptr
);
3574 if (copy_to_user(arg
, file
, sizeof(*file
)))
3582 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3584 mdu_disk_info_t info
;
3588 if (copy_from_user(&info
, arg
, sizeof(info
)))
3593 rdev
= find_rdev_nr(mddev
, nr
);
3595 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3596 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3597 info
.raid_disk
= rdev
->raid_disk
;
3599 if (test_bit(Faulty
, &rdev
->flags
))
3600 info
.state
|= (1<<MD_DISK_FAULTY
);
3601 else if (test_bit(In_sync
, &rdev
->flags
)) {
3602 info
.state
|= (1<<MD_DISK_ACTIVE
);
3603 info
.state
|= (1<<MD_DISK_SYNC
);
3605 if (test_bit(WriteMostly
, &rdev
->flags
))
3606 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3608 info
.major
= info
.minor
= 0;
3609 info
.raid_disk
= -1;
3610 info
.state
= (1<<MD_DISK_REMOVED
);
3613 if (copy_to_user(arg
, &info
, sizeof(info
)))
3619 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3621 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3623 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3625 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3628 if (!mddev
->raid_disks
) {
3630 /* expecting a device which has a superblock */
3631 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3634 "md: md_import_device returned %ld\n",
3636 return PTR_ERR(rdev
);
3638 if (!list_empty(&mddev
->disks
)) {
3639 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3640 mdk_rdev_t
, same_set
);
3641 int err
= super_types
[mddev
->major_version
]
3642 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3645 "md: %s has different UUID to %s\n",
3646 bdevname(rdev
->bdev
,b
),
3647 bdevname(rdev0
->bdev
,b2
));
3652 err
= bind_rdev_to_array(rdev
, mddev
);
3659 * add_new_disk can be used once the array is assembled
3660 * to add "hot spares". They must already have a superblock
3665 if (!mddev
->pers
->hot_add_disk
) {
3667 "%s: personality does not support diskops!\n",
3671 if (mddev
->persistent
)
3672 rdev
= md_import_device(dev
, mddev
->major_version
,
3673 mddev
->minor_version
);
3675 rdev
= md_import_device(dev
, -1, -1);
3678 "md: md_import_device returned %ld\n",
3680 return PTR_ERR(rdev
);
3682 /* set save_raid_disk if appropriate */
3683 if (!mddev
->persistent
) {
3684 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3685 info
->raid_disk
< mddev
->raid_disks
)
3686 rdev
->raid_disk
= info
->raid_disk
;
3688 rdev
->raid_disk
= -1;
3690 super_types
[mddev
->major_version
].
3691 validate_super(mddev
, rdev
);
3692 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3694 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3695 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3696 set_bit(WriteMostly
, &rdev
->flags
);
3698 rdev
->raid_disk
= -1;
3699 err
= bind_rdev_to_array(rdev
, mddev
);
3700 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
3701 /* If there is hot_add_disk but no hot_remove_disk
3702 * then added disks for geometry changes,
3703 * and should be added immediately.
3705 super_types
[mddev
->major_version
].
3706 validate_super(mddev
, rdev
);
3707 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
3709 unbind_rdev_from_array(rdev
);
3714 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3715 md_wakeup_thread(mddev
->thread
);
3719 /* otherwise, add_new_disk is only allowed
3720 * for major_version==0 superblocks
3722 if (mddev
->major_version
!= 0) {
3723 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3728 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3730 rdev
= md_import_device (dev
, -1, 0);
3733 "md: error, md_import_device() returned %ld\n",
3735 return PTR_ERR(rdev
);
3737 rdev
->desc_nr
= info
->number
;
3738 if (info
->raid_disk
< mddev
->raid_disks
)
3739 rdev
->raid_disk
= info
->raid_disk
;
3741 rdev
->raid_disk
= -1;
3745 if (rdev
->raid_disk
< mddev
->raid_disks
)
3746 if (info
->state
& (1<<MD_DISK_SYNC
))
3747 set_bit(In_sync
, &rdev
->flags
);
3749 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3750 set_bit(WriteMostly
, &rdev
->flags
);
3752 if (!mddev
->persistent
) {
3753 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3754 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3756 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3757 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3759 err
= bind_rdev_to_array(rdev
, mddev
);
3769 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3771 char b
[BDEVNAME_SIZE
];
3777 rdev
= find_rdev(mddev
, dev
);
3781 if (rdev
->raid_disk
>= 0)
3784 kick_rdev_from_array(rdev
);
3785 md_update_sb(mddev
, 1);
3786 md_new_event(mddev
);
3790 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3791 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3795 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3797 char b
[BDEVNAME_SIZE
];
3805 if (mddev
->major_version
!= 0) {
3806 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3807 " version-0 superblocks.\n",
3811 if (!mddev
->pers
->hot_add_disk
) {
3813 "%s: personality does not support diskops!\n",
3818 rdev
= md_import_device (dev
, -1, 0);
3821 "md: error, md_import_device() returned %ld\n",
3826 if (mddev
->persistent
)
3827 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3830 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3832 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3835 if (test_bit(Faulty
, &rdev
->flags
)) {
3837 "md: can not hot-add faulty %s disk to %s!\n",
3838 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3842 clear_bit(In_sync
, &rdev
->flags
);
3844 err
= bind_rdev_to_array(rdev
, mddev
);
3849 * The rest should better be atomic, we can have disk failures
3850 * noticed in interrupt contexts ...
3853 if (rdev
->desc_nr
== mddev
->max_disks
) {
3854 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
3857 goto abort_unbind_export
;
3860 rdev
->raid_disk
= -1;
3862 md_update_sb(mddev
, 1);
3865 * Kick recovery, maybe this spare has to be added to the
3866 * array immediately.
3868 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3869 md_wakeup_thread(mddev
->thread
);
3870 md_new_event(mddev
);
3873 abort_unbind_export
:
3874 unbind_rdev_from_array(rdev
);
3881 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
3886 if (!mddev
->pers
->quiesce
)
3888 if (mddev
->recovery
|| mddev
->sync_thread
)
3890 /* we should be able to change the bitmap.. */
3896 return -EEXIST
; /* cannot add when bitmap is present */
3897 mddev
->bitmap_file
= fget(fd
);
3899 if (mddev
->bitmap_file
== NULL
) {
3900 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
3905 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
3907 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
3909 fput(mddev
->bitmap_file
);
3910 mddev
->bitmap_file
= NULL
;
3913 mddev
->bitmap_offset
= 0; /* file overrides offset */
3914 } else if (mddev
->bitmap
== NULL
)
3915 return -ENOENT
; /* cannot remove what isn't there */
3918 mddev
->pers
->quiesce(mddev
, 1);
3920 err
= bitmap_create(mddev
);
3921 if (fd
< 0 || err
) {
3922 bitmap_destroy(mddev
);
3923 fd
= -1; /* make sure to put the file */
3925 mddev
->pers
->quiesce(mddev
, 0);
3928 if (mddev
->bitmap_file
) {
3929 restore_bitmap_write_access(mddev
->bitmap_file
);
3930 fput(mddev
->bitmap_file
);
3932 mddev
->bitmap_file
= NULL
;
3939 * set_array_info is used two different ways
3940 * The original usage is when creating a new array.
3941 * In this usage, raid_disks is > 0 and it together with
3942 * level, size, not_persistent,layout,chunksize determine the
3943 * shape of the array.
3944 * This will always create an array with a type-0.90.0 superblock.
3945 * The newer usage is when assembling an array.
3946 * In this case raid_disks will be 0, and the major_version field is
3947 * use to determine which style super-blocks are to be found on the devices.
3948 * The minor and patch _version numbers are also kept incase the
3949 * super_block handler wishes to interpret them.
3951 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
3954 if (info
->raid_disks
== 0) {
3955 /* just setting version number for superblock loading */
3956 if (info
->major_version
< 0 ||
3957 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
3958 super_types
[info
->major_version
].name
== NULL
) {
3959 /* maybe try to auto-load a module? */
3961 "md: superblock version %d not known\n",
3962 info
->major_version
);
3965 mddev
->major_version
= info
->major_version
;
3966 mddev
->minor_version
= info
->minor_version
;
3967 mddev
->patch_version
= info
->patch_version
;
3970 mddev
->major_version
= MD_MAJOR_VERSION
;
3971 mddev
->minor_version
= MD_MINOR_VERSION
;
3972 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
3973 mddev
->ctime
= get_seconds();
3975 mddev
->level
= info
->level
;
3976 mddev
->clevel
[0] = 0;
3977 mddev
->size
= info
->size
;
3978 mddev
->raid_disks
= info
->raid_disks
;
3979 /* don't set md_minor, it is determined by which /dev/md* was
3982 if (info
->state
& (1<<MD_SB_CLEAN
))
3983 mddev
->recovery_cp
= MaxSector
;
3985 mddev
->recovery_cp
= 0;
3986 mddev
->persistent
= ! info
->not_persistent
;
3988 mddev
->layout
= info
->layout
;
3989 mddev
->chunk_size
= info
->chunk_size
;
3991 mddev
->max_disks
= MD_SB_DISKS
;
3994 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3996 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
3997 mddev
->bitmap_offset
= 0;
3999 mddev
->reshape_position
= MaxSector
;
4002 * Generate a 128 bit UUID
4004 get_random_bytes(mddev
->uuid
, 16);
4006 mddev
->new_level
= mddev
->level
;
4007 mddev
->new_chunk
= mddev
->chunk_size
;
4008 mddev
->new_layout
= mddev
->layout
;
4009 mddev
->delta_disks
= 0;
4014 static int update_size(mddev_t
*mddev
, unsigned long size
)
4018 struct list_head
*tmp
;
4019 int fit
= (size
== 0);
4021 if (mddev
->pers
->resize
== NULL
)
4023 /* The "size" is the amount of each device that is used.
4024 * This can only make sense for arrays with redundancy.
4025 * linear and raid0 always use whatever space is available
4026 * We can only consider changing the size if no resync
4027 * or reconstruction is happening, and if the new size
4028 * is acceptable. It must fit before the sb_offset or,
4029 * if that is <data_offset, it must fit before the
4030 * size of each device.
4031 * If size is zero, we find the largest size that fits.
4033 if (mddev
->sync_thread
)
4035 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4037 if (rdev
->sb_offset
> rdev
->data_offset
)
4038 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
4040 avail
= get_capacity(rdev
->bdev
->bd_disk
)
4041 - rdev
->data_offset
;
4042 if (fit
&& (size
== 0 || size
> avail
/2))
4044 if (avail
< ((sector_t
)size
<< 1))
4047 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4049 struct block_device
*bdev
;
4051 bdev
= bdget_disk(mddev
->gendisk
, 0);
4053 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4054 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4055 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4062 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4065 /* change the number of raid disks */
4066 if (mddev
->pers
->check_reshape
== NULL
)
4068 if (raid_disks
<= 0 ||
4069 raid_disks
>= mddev
->max_disks
)
4071 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4073 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4075 rv
= mddev
->pers
->check_reshape(mddev
);
4081 * update_array_info is used to change the configuration of an
4083 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4084 * fields in the info are checked against the array.
4085 * Any differences that cannot be handled will cause an error.
4086 * Normally, only one change can be managed at a time.
4088 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4094 /* calculate expected state,ignoring low bits */
4095 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4096 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4098 if (mddev
->major_version
!= info
->major_version
||
4099 mddev
->minor_version
!= info
->minor_version
||
4100 /* mddev->patch_version != info->patch_version || */
4101 mddev
->ctime
!= info
->ctime
||
4102 mddev
->level
!= info
->level
||
4103 /* mddev->layout != info->layout || */
4104 !mddev
->persistent
!= info
->not_persistent
||
4105 mddev
->chunk_size
!= info
->chunk_size
||
4106 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4107 ((state
^info
->state
) & 0xfffffe00)
4110 /* Check there is only one change */
4111 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4112 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4113 if (mddev
->layout
!= info
->layout
) cnt
++;
4114 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4115 if (cnt
== 0) return 0;
4116 if (cnt
> 1) return -EINVAL
;
4118 if (mddev
->layout
!= info
->layout
) {
4120 * we don't need to do anything at the md level, the
4121 * personality will take care of it all.
4123 if (mddev
->pers
->reconfig
== NULL
)
4126 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4128 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4129 rv
= update_size(mddev
, info
->size
);
4131 if (mddev
->raid_disks
!= info
->raid_disks
)
4132 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4134 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4135 if (mddev
->pers
->quiesce
== NULL
)
4137 if (mddev
->recovery
|| mddev
->sync_thread
)
4139 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4140 /* add the bitmap */
4143 if (mddev
->default_bitmap_offset
== 0)
4145 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4146 mddev
->pers
->quiesce(mddev
, 1);
4147 rv
= bitmap_create(mddev
);
4149 bitmap_destroy(mddev
);
4150 mddev
->pers
->quiesce(mddev
, 0);
4152 /* remove the bitmap */
4155 if (mddev
->bitmap
->file
)
4157 mddev
->pers
->quiesce(mddev
, 1);
4158 bitmap_destroy(mddev
);
4159 mddev
->pers
->quiesce(mddev
, 0);
4160 mddev
->bitmap_offset
= 0;
4163 md_update_sb(mddev
, 1);
4167 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4171 if (mddev
->pers
== NULL
)
4174 rdev
= find_rdev(mddev
, dev
);
4178 md_error(mddev
, rdev
);
4182 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4184 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4188 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4192 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4193 unsigned int cmd
, unsigned long arg
)
4196 void __user
*argp
= (void __user
*)arg
;
4197 mddev_t
*mddev
= NULL
;
4199 if (!capable(CAP_SYS_ADMIN
))
4203 * Commands dealing with the RAID driver but not any
4209 err
= get_version(argp
);
4212 case PRINT_RAID_DEBUG
:
4220 autostart_arrays(arg
);
4227 * Commands creating/starting a new array:
4230 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4237 err
= mddev_lock(mddev
);
4240 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4247 case SET_ARRAY_INFO
:
4249 mdu_array_info_t info
;
4251 memset(&info
, 0, sizeof(info
));
4252 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4257 err
= update_array_info(mddev
, &info
);
4259 printk(KERN_WARNING
"md: couldn't update"
4260 " array info. %d\n", err
);
4265 if (!list_empty(&mddev
->disks
)) {
4267 "md: array %s already has disks!\n",
4272 if (mddev
->raid_disks
) {
4274 "md: array %s already initialised!\n",
4279 err
= set_array_info(mddev
, &info
);
4281 printk(KERN_WARNING
"md: couldn't set"
4282 " array info. %d\n", err
);
4292 * Commands querying/configuring an existing array:
4294 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4295 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4296 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4297 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
4303 * Commands even a read-only array can execute:
4307 case GET_ARRAY_INFO
:
4308 err
= get_array_info(mddev
, argp
);
4311 case GET_BITMAP_FILE
:
4312 err
= get_bitmap_file(mddev
, argp
);
4316 err
= get_disk_info(mddev
, argp
);
4319 case RESTART_ARRAY_RW
:
4320 err
= restart_array(mddev
);
4324 err
= do_md_stop (mddev
, 0);
4328 err
= do_md_stop (mddev
, 1);
4332 * We have a problem here : there is no easy way to give a CHS
4333 * virtual geometry. We currently pretend that we have a 2 heads
4334 * 4 sectors (with a BIG number of cylinders...). This drives
4335 * dosfs just mad... ;-)
4340 * The remaining ioctls are changing the state of the
4341 * superblock, so we do not allow them on read-only arrays.
4342 * However non-MD ioctls (e.g. get-size) will still come through
4343 * here and hit the 'default' below, so only disallow
4344 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4346 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
4347 mddev
->ro
&& mddev
->pers
) {
4348 if (mddev
->ro
== 2) {
4350 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4351 md_wakeup_thread(mddev
->thread
);
4363 mdu_disk_info_t info
;
4364 if (copy_from_user(&info
, argp
, sizeof(info
)))
4367 err
= add_new_disk(mddev
, &info
);
4371 case HOT_REMOVE_DISK
:
4372 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4376 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4379 case SET_DISK_FAULTY
:
4380 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4384 err
= do_md_run (mddev
);
4387 case SET_BITMAP_FILE
:
4388 err
= set_bitmap_file(mddev
, (int)arg
);
4398 mddev_unlock(mddev
);
4408 static int md_open(struct inode
*inode
, struct file
*file
)
4411 * Succeed if we can lock the mddev, which confirms that
4412 * it isn't being stopped right now.
4414 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4417 if ((err
= mddev_lock(mddev
)))
4422 mddev_unlock(mddev
);
4424 check_disk_change(inode
->i_bdev
);
4429 static int md_release(struct inode
*inode
, struct file
* file
)
4431 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4440 static int md_media_changed(struct gendisk
*disk
)
4442 mddev_t
*mddev
= disk
->private_data
;
4444 return mddev
->changed
;
4447 static int md_revalidate(struct gendisk
*disk
)
4449 mddev_t
*mddev
= disk
->private_data
;
4454 static struct block_device_operations md_fops
=
4456 .owner
= THIS_MODULE
,
4458 .release
= md_release
,
4460 .getgeo
= md_getgeo
,
4461 .media_changed
= md_media_changed
,
4462 .revalidate_disk
= md_revalidate
,
4465 static int md_thread(void * arg
)
4467 mdk_thread_t
*thread
= arg
;
4470 * md_thread is a 'system-thread', it's priority should be very
4471 * high. We avoid resource deadlocks individually in each
4472 * raid personality. (RAID5 does preallocation) We also use RR and
4473 * the very same RT priority as kswapd, thus we will never get
4474 * into a priority inversion deadlock.
4476 * we definitely have to have equal or higher priority than
4477 * bdflush, otherwise bdflush will deadlock if there are too
4478 * many dirty RAID5 blocks.
4481 allow_signal(SIGKILL
);
4482 while (!kthread_should_stop()) {
4484 /* We need to wait INTERRUPTIBLE so that
4485 * we don't add to the load-average.
4486 * That means we need to be sure no signals are
4489 if (signal_pending(current
))
4490 flush_signals(current
);
4492 wait_event_interruptible_timeout
4494 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4495 || kthread_should_stop(),
4499 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4501 thread
->run(thread
->mddev
);
4507 void md_wakeup_thread(mdk_thread_t
*thread
)
4510 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4511 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4512 wake_up(&thread
->wqueue
);
4516 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4519 mdk_thread_t
*thread
;
4521 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4525 init_waitqueue_head(&thread
->wqueue
);
4528 thread
->mddev
= mddev
;
4529 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4530 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4531 if (IS_ERR(thread
->tsk
)) {
4538 void md_unregister_thread(mdk_thread_t
*thread
)
4540 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
4542 kthread_stop(thread
->tsk
);
4546 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4553 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4556 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4558 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4559 __builtin_return_address(0),__builtin_return_address(1),
4560 __builtin_return_address(2),__builtin_return_address(3));
4564 if (!mddev
->pers
->error_handler
)
4566 mddev
->pers
->error_handler(mddev
,rdev
);
4567 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4568 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4569 md_wakeup_thread(mddev
->thread
);
4570 md_new_event_inintr(mddev
);
4573 /* seq_file implementation /proc/mdstat */
4575 static void status_unused(struct seq_file
*seq
)
4579 struct list_head
*tmp
;
4581 seq_printf(seq
, "unused devices: ");
4583 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4584 char b
[BDEVNAME_SIZE
];
4586 seq_printf(seq
, "%s ",
4587 bdevname(rdev
->bdev
,b
));
4590 seq_printf(seq
, "<none>");
4592 seq_printf(seq
, "\n");
4596 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4598 sector_t max_blocks
, resync
, res
;
4599 unsigned long dt
, db
, rt
;
4601 unsigned int per_milli
;
4603 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4605 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4606 max_blocks
= mddev
->resync_max_sectors
>> 1;
4608 max_blocks
= mddev
->size
;
4611 * Should not happen.
4617 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4618 * in a sector_t, and (max_blocks>>scale) will fit in a
4619 * u32, as those are the requirements for sector_div.
4620 * Thus 'scale' must be at least 10
4623 if (sizeof(sector_t
) > sizeof(unsigned long)) {
4624 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
4627 res
= (resync
>>scale
)*1000;
4628 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
4632 int i
, x
= per_milli
/50, y
= 20-x
;
4633 seq_printf(seq
, "[");
4634 for (i
= 0; i
< x
; i
++)
4635 seq_printf(seq
, "=");
4636 seq_printf(seq
, ">");
4637 for (i
= 0; i
< y
; i
++)
4638 seq_printf(seq
, ".");
4639 seq_printf(seq
, "] ");
4641 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
4642 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
4644 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
4646 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4647 "resync" : "recovery"))),
4648 per_milli
/10, per_milli
% 10,
4649 (unsigned long long) resync
,
4650 (unsigned long long) max_blocks
);
4653 * We do not want to overflow, so the order of operands and
4654 * the * 100 / 100 trick are important. We do a +1 to be
4655 * safe against division by zero. We only estimate anyway.
4657 * dt: time from mark until now
4658 * db: blocks written from mark until now
4659 * rt: remaining time
4661 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4663 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
4664 - mddev
->resync_mark_cnt
;
4665 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
4667 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4669 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
4672 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4674 struct list_head
*tmp
;
4684 spin_lock(&all_mddevs_lock
);
4685 list_for_each(tmp
,&all_mddevs
)
4687 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4689 spin_unlock(&all_mddevs_lock
);
4692 spin_unlock(&all_mddevs_lock
);
4694 return (void*)2;/* tail */
4698 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4700 struct list_head
*tmp
;
4701 mddev_t
*next_mddev
, *mddev
= v
;
4707 spin_lock(&all_mddevs_lock
);
4709 tmp
= all_mddevs
.next
;
4711 tmp
= mddev
->all_mddevs
.next
;
4712 if (tmp
!= &all_mddevs
)
4713 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4715 next_mddev
= (void*)2;
4718 spin_unlock(&all_mddevs_lock
);
4726 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4730 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4734 struct mdstat_info
{
4738 static int md_seq_show(struct seq_file
*seq
, void *v
)
4742 struct list_head
*tmp2
;
4744 struct mdstat_info
*mi
= seq
->private;
4745 struct bitmap
*bitmap
;
4747 if (v
== (void*)1) {
4748 struct mdk_personality
*pers
;
4749 seq_printf(seq
, "Personalities : ");
4750 spin_lock(&pers_lock
);
4751 list_for_each_entry(pers
, &pers_list
, list
)
4752 seq_printf(seq
, "[%s] ", pers
->name
);
4754 spin_unlock(&pers_lock
);
4755 seq_printf(seq
, "\n");
4756 mi
->event
= atomic_read(&md_event_count
);
4759 if (v
== (void*)2) {
4764 if (mddev_lock(mddev
) < 0)
4767 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4768 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4769 mddev
->pers
? "" : "in");
4772 seq_printf(seq
, " (read-only)");
4774 seq_printf(seq
, "(auto-read-only)");
4775 seq_printf(seq
, " %s", mddev
->pers
->name
);
4779 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4780 char b
[BDEVNAME_SIZE
];
4781 seq_printf(seq
, " %s[%d]",
4782 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4783 if (test_bit(WriteMostly
, &rdev
->flags
))
4784 seq_printf(seq
, "(W)");
4785 if (test_bit(Faulty
, &rdev
->flags
)) {
4786 seq_printf(seq
, "(F)");
4788 } else if (rdev
->raid_disk
< 0)
4789 seq_printf(seq
, "(S)"); /* spare */
4793 if (!list_empty(&mddev
->disks
)) {
4795 seq_printf(seq
, "\n %llu blocks",
4796 (unsigned long long)mddev
->array_size
);
4798 seq_printf(seq
, "\n %llu blocks",
4799 (unsigned long long)size
);
4801 if (mddev
->persistent
) {
4802 if (mddev
->major_version
!= 0 ||
4803 mddev
->minor_version
!= 90) {
4804 seq_printf(seq
," super %d.%d",
4805 mddev
->major_version
,
4806 mddev
->minor_version
);
4809 seq_printf(seq
, " super non-persistent");
4812 mddev
->pers
->status (seq
, mddev
);
4813 seq_printf(seq
, "\n ");
4814 if (mddev
->pers
->sync_request
) {
4815 if (mddev
->curr_resync
> 2) {
4816 status_resync (seq
, mddev
);
4817 seq_printf(seq
, "\n ");
4818 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4819 seq_printf(seq
, "\tresync=DELAYED\n ");
4820 else if (mddev
->recovery_cp
< MaxSector
)
4821 seq_printf(seq
, "\tresync=PENDING\n ");
4824 seq_printf(seq
, "\n ");
4826 if ((bitmap
= mddev
->bitmap
)) {
4827 unsigned long chunk_kb
;
4828 unsigned long flags
;
4829 spin_lock_irqsave(&bitmap
->lock
, flags
);
4830 chunk_kb
= bitmap
->chunksize
>> 10;
4831 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4833 bitmap
->pages
- bitmap
->missing_pages
,
4835 (bitmap
->pages
- bitmap
->missing_pages
)
4836 << (PAGE_SHIFT
- 10),
4837 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
4838 chunk_kb
? "KB" : "B");
4840 seq_printf(seq
, ", file: ");
4841 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
4842 bitmap
->file
->f_dentry
," \t\n");
4845 seq_printf(seq
, "\n");
4846 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
4849 seq_printf(seq
, "\n");
4851 mddev_unlock(mddev
);
4856 static struct seq_operations md_seq_ops
= {
4857 .start
= md_seq_start
,
4858 .next
= md_seq_next
,
4859 .stop
= md_seq_stop
,
4860 .show
= md_seq_show
,
4863 static int md_seq_open(struct inode
*inode
, struct file
*file
)
4866 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
4870 error
= seq_open(file
, &md_seq_ops
);
4874 struct seq_file
*p
= file
->private_data
;
4876 mi
->event
= atomic_read(&md_event_count
);
4881 static int md_seq_release(struct inode
*inode
, struct file
*file
)
4883 struct seq_file
*m
= file
->private_data
;
4884 struct mdstat_info
*mi
= m
->private;
4887 return seq_release(inode
, file
);
4890 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
4892 struct seq_file
*m
= filp
->private_data
;
4893 struct mdstat_info
*mi
= m
->private;
4896 poll_wait(filp
, &md_event_waiters
, wait
);
4898 /* always allow read */
4899 mask
= POLLIN
| POLLRDNORM
;
4901 if (mi
->event
!= atomic_read(&md_event_count
))
4902 mask
|= POLLERR
| POLLPRI
;
4906 static struct file_operations md_seq_fops
= {
4907 .open
= md_seq_open
,
4909 .llseek
= seq_lseek
,
4910 .release
= md_seq_release
,
4911 .poll
= mdstat_poll
,
4914 int register_md_personality(struct mdk_personality
*p
)
4916 spin_lock(&pers_lock
);
4917 list_add_tail(&p
->list
, &pers_list
);
4918 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
4919 spin_unlock(&pers_lock
);
4923 int unregister_md_personality(struct mdk_personality
*p
)
4925 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
4926 spin_lock(&pers_lock
);
4927 list_del_init(&p
->list
);
4928 spin_unlock(&pers_lock
);
4932 static int is_mddev_idle(mddev_t
*mddev
)
4935 struct list_head
*tmp
;
4937 unsigned long curr_events
;
4940 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4941 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
4942 curr_events
= disk_stat_read(disk
, sectors
[0]) +
4943 disk_stat_read(disk
, sectors
[1]) -
4944 atomic_read(&disk
->sync_io
);
4945 /* The difference between curr_events and last_events
4946 * will be affected by any new non-sync IO (making
4947 * curr_events bigger) and any difference in the amount of
4948 * in-flight syncio (making current_events bigger or smaller)
4949 * The amount in-flight is currently limited to
4950 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4951 * which is at most 4096 sectors.
4952 * These numbers are fairly fragile and should be made
4953 * more robust, probably by enforcing the
4954 * 'window size' that md_do_sync sort-of uses.
4956 * Note: the following is an unsigned comparison.
4958 if ((curr_events
- rdev
->last_events
+ 4096) > 8192) {
4959 rdev
->last_events
= curr_events
;
4966 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
4968 /* another "blocks" (512byte) blocks have been synced */
4969 atomic_sub(blocks
, &mddev
->recovery_active
);
4970 wake_up(&mddev
->recovery_wait
);
4972 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4973 md_wakeup_thread(mddev
->thread
);
4974 // stop recovery, signal do_sync ....
4979 /* md_write_start(mddev, bi)
4980 * If we need to update some array metadata (e.g. 'active' flag
4981 * in superblock) before writing, schedule a superblock update
4982 * and wait for it to complete.
4984 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
4986 if (bio_data_dir(bi
) != WRITE
)
4989 BUG_ON(mddev
->ro
== 1);
4990 if (mddev
->ro
== 2) {
4991 /* need to switch to read/write */
4993 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4994 md_wakeup_thread(mddev
->thread
);
4996 atomic_inc(&mddev
->writes_pending
);
4997 if (mddev
->in_sync
) {
4998 spin_lock_irq(&mddev
->write_lock
);
4999 if (mddev
->in_sync
) {
5001 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5002 md_wakeup_thread(mddev
->thread
);
5004 spin_unlock_irq(&mddev
->write_lock
);
5006 wait_event(mddev
->sb_wait
, mddev
->flags
==0);
5009 void md_write_end(mddev_t
*mddev
)
5011 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5012 if (mddev
->safemode
== 2)
5013 md_wakeup_thread(mddev
->thread
);
5014 else if (mddev
->safemode_delay
)
5015 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5019 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
5021 #define SYNC_MARKS 10
5022 #define SYNC_MARK_STEP (3*HZ)
5023 void md_do_sync(mddev_t
*mddev
)
5026 unsigned int currspeed
= 0,
5028 sector_t max_sectors
,j
, io_sectors
;
5029 unsigned long mark
[SYNC_MARKS
];
5030 sector_t mark_cnt
[SYNC_MARKS
];
5032 struct list_head
*tmp
;
5033 sector_t last_check
;
5035 struct list_head
*rtmp
;
5039 /* just incase thread restarts... */
5040 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5042 if (mddev
->ro
) /* never try to sync a read-only array */
5045 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5046 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
5047 desc
= "data-check";
5048 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5049 desc
= "requested-resync";
5052 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5057 /* we overload curr_resync somewhat here.
5058 * 0 == not engaged in resync at all
5059 * 2 == checking that there is no conflict with another sync
5060 * 1 == like 2, but have yielded to allow conflicting resync to
5062 * other == active in resync - this many blocks
5064 * Before starting a resync we must have set curr_resync to
5065 * 2, and then checked that every "conflicting" array has curr_resync
5066 * less than ours. When we find one that is the same or higher
5067 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5068 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5069 * This will mean we have to start checking from the beginning again.
5074 mddev
->curr_resync
= 2;
5077 if (kthread_should_stop()) {
5078 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5081 ITERATE_MDDEV(mddev2
,tmp
) {
5082 if (mddev2
== mddev
)
5084 if (mddev2
->curr_resync
&&
5085 match_mddev_units(mddev
,mddev2
)) {
5087 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5088 /* arbitrarily yield */
5089 mddev
->curr_resync
= 1;
5090 wake_up(&resync_wait
);
5092 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5093 /* no need to wait here, we can wait the next
5094 * time 'round when curr_resync == 2
5097 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5098 if (!kthread_should_stop() &&
5099 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5100 printk(KERN_INFO
"md: delaying %s of %s"
5101 " until %s has finished (they"
5102 " share one or more physical units)\n",
5103 desc
, mdname(mddev
), mdname(mddev2
));
5106 finish_wait(&resync_wait
, &wq
);
5109 finish_wait(&resync_wait
, &wq
);
5112 } while (mddev
->curr_resync
< 2);
5115 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5116 /* resync follows the size requested by the personality,
5117 * which defaults to physical size, but can be virtual size
5119 max_sectors
= mddev
->resync_max_sectors
;
5120 mddev
->resync_mismatches
= 0;
5121 /* we don't use the checkpoint if there's a bitmap */
5122 if (!mddev
->bitmap
&&
5123 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5124 j
= mddev
->recovery_cp
;
5125 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5126 max_sectors
= mddev
->size
<< 1;
5128 /* recovery follows the physical size of devices */
5129 max_sectors
= mddev
->size
<< 1;
5131 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5132 if (rdev
->raid_disk
>= 0 &&
5133 !test_bit(Faulty
, &rdev
->flags
) &&
5134 !test_bit(In_sync
, &rdev
->flags
) &&
5135 rdev
->recovery_offset
< j
)
5136 j
= rdev
->recovery_offset
;
5139 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
5140 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
5141 " %d KB/sec/disk.\n", speed_min(mddev
));
5142 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5143 "(but not more than %d KB/sec) for %s.\n",
5144 speed_max(mddev
), desc
);
5146 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5149 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5151 mark_cnt
[m
] = io_sectors
;
5154 mddev
->resync_mark
= mark
[last_mark
];
5155 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5158 * Tune reconstruction:
5160 window
= 32*(PAGE_SIZE
/512);
5161 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5162 window
/2,(unsigned long long) max_sectors
/2);
5164 atomic_set(&mddev
->recovery_active
, 0);
5165 init_waitqueue_head(&mddev
->recovery_wait
);
5170 "md: resuming %s of %s from checkpoint.\n",
5171 desc
, mdname(mddev
));
5172 mddev
->curr_resync
= j
;
5175 while (j
< max_sectors
) {
5179 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5180 currspeed
< speed_min(mddev
));
5182 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5186 if (!skipped
) { /* actual IO requested */
5187 io_sectors
+= sectors
;
5188 atomic_add(sectors
, &mddev
->recovery_active
);
5192 if (j
>1) mddev
->curr_resync
= j
;
5193 mddev
->curr_mark_cnt
= io_sectors
;
5194 if (last_check
== 0)
5195 /* this is the earliers that rebuilt will be
5196 * visible in /proc/mdstat
5198 md_new_event(mddev
);
5200 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5203 last_check
= io_sectors
;
5205 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
5206 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
5210 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5212 int next
= (last_mark
+1) % SYNC_MARKS
;
5214 mddev
->resync_mark
= mark
[next
];
5215 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5216 mark
[next
] = jiffies
;
5217 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5222 if (kthread_should_stop()) {
5224 * got a signal, exit.
5227 "md: md_do_sync() got signal ... exiting\n");
5228 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5233 * this loop exits only if either when we are slower than
5234 * the 'hard' speed limit, or the system was IO-idle for
5236 * the system might be non-idle CPU-wise, but we only care
5237 * about not overloading the IO subsystem. (things like an
5238 * e2fsck being done on the RAID array should execute fast)
5240 mddev
->queue
->unplug_fn(mddev
->queue
);
5243 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5244 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5246 if (currspeed
> speed_min(mddev
)) {
5247 if ((currspeed
> speed_max(mddev
)) ||
5248 !is_mddev_idle(mddev
)) {
5254 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
5256 * this also signals 'finished resyncing' to md_stop
5259 mddev
->queue
->unplug_fn(mddev
->queue
);
5261 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5263 /* tell personality that we are finished */
5264 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5266 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5267 test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
5268 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5269 mddev
->curr_resync
> 2) {
5270 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5271 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5272 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5274 "md: checkpointing %s of %s.\n",
5275 desc
, mdname(mddev
));
5276 mddev
->recovery_cp
= mddev
->curr_resync
;
5279 mddev
->recovery_cp
= MaxSector
;
5281 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5282 mddev
->curr_resync
= MaxSector
;
5283 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5284 if (rdev
->raid_disk
>= 0 &&
5285 !test_bit(Faulty
, &rdev
->flags
) &&
5286 !test_bit(In_sync
, &rdev
->flags
) &&
5287 rdev
->recovery_offset
< mddev
->curr_resync
)
5288 rdev
->recovery_offset
= mddev
->curr_resync
;
5293 mddev
->curr_resync
= 0;
5294 wake_up(&resync_wait
);
5295 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5296 md_wakeup_thread(mddev
->thread
);
5298 EXPORT_SYMBOL_GPL(md_do_sync
);
5302 * This routine is regularly called by all per-raid-array threads to
5303 * deal with generic issues like resync and super-block update.
5304 * Raid personalities that don't have a thread (linear/raid0) do not
5305 * need this as they never do any recovery or update the superblock.
5307 * It does not do any resync itself, but rather "forks" off other threads
5308 * to do that as needed.
5309 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5310 * "->recovery" and create a thread at ->sync_thread.
5311 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5312 * and wakeups up this thread which will reap the thread and finish up.
5313 * This thread also removes any faulty devices (with nr_pending == 0).
5315 * The overall approach is:
5316 * 1/ if the superblock needs updating, update it.
5317 * 2/ If a recovery thread is running, don't do anything else.
5318 * 3/ If recovery has finished, clean up, possibly marking spares active.
5319 * 4/ If there are any faulty devices, remove them.
5320 * 5/ If array is degraded, try to add spares devices
5321 * 6/ If array has spares or is not in-sync, start a resync thread.
5323 void md_check_recovery(mddev_t
*mddev
)
5326 struct list_head
*rtmp
;
5330 bitmap_daemon_work(mddev
->bitmap
);
5335 if (signal_pending(current
)) {
5336 if (mddev
->pers
->sync_request
) {
5337 printk(KERN_INFO
"md: %s in immediate safe mode\n",
5339 mddev
->safemode
= 2;
5341 flush_signals(current
);
5346 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
5347 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
5348 (mddev
->safemode
== 1) ||
5349 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
5350 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
5354 if (mddev_trylock(mddev
)) {
5357 spin_lock_irq(&mddev
->write_lock
);
5358 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
5359 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
5361 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
5363 if (mddev
->safemode
== 1)
5364 mddev
->safemode
= 0;
5365 spin_unlock_irq(&mddev
->write_lock
);
5368 md_update_sb(mddev
, 0);
5371 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
5372 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
5373 /* resync/recovery still happening */
5374 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5377 if (mddev
->sync_thread
) {
5378 /* resync has finished, collect result */
5379 md_unregister_thread(mddev
->sync_thread
);
5380 mddev
->sync_thread
= NULL
;
5381 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5382 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5384 /* activate any spares */
5385 mddev
->pers
->spare_active(mddev
);
5387 md_update_sb(mddev
, 1);
5389 /* if array is no-longer degraded, then any saved_raid_disk
5390 * information must be scrapped
5392 if (!mddev
->degraded
)
5393 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5394 rdev
->saved_raid_disk
= -1;
5396 mddev
->recovery
= 0;
5397 /* flag recovery needed just to double check */
5398 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5399 md_new_event(mddev
);
5402 /* Clear some bits that don't mean anything, but
5405 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5406 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5407 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5408 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5410 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
5412 /* no recovery is running.
5413 * remove any failed drives, then
5414 * add spares if possible.
5415 * Spare are also removed and re-added, to allow
5416 * the personality to fail the re-add.
5418 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5419 if (rdev
->raid_disk
>= 0 &&
5420 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
5421 atomic_read(&rdev
->nr_pending
)==0) {
5422 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
5424 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5425 sysfs_remove_link(&mddev
->kobj
, nm
);
5426 rdev
->raid_disk
= -1;
5430 if (mddev
->degraded
) {
5431 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5432 if (rdev
->raid_disk
< 0
5433 && !test_bit(Faulty
, &rdev
->flags
)) {
5434 rdev
->recovery_offset
= 0;
5435 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
5437 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5438 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
5440 md_new_event(mddev
);
5447 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5448 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
5449 } else if (mddev
->recovery_cp
< MaxSector
) {
5450 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5451 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5452 /* nothing to be done ... */
5455 if (mddev
->pers
->sync_request
) {
5456 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
5457 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
5458 /* We are adding a device or devices to an array
5459 * which has the bitmap stored on all devices.
5460 * So make sure all bitmap pages get written
5462 bitmap_write_all(mddev
->bitmap
);
5464 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5467 if (!mddev
->sync_thread
) {
5468 printk(KERN_ERR
"%s: could not start resync"
5471 /* leave the spares where they are, it shouldn't hurt */
5472 mddev
->recovery
= 0;
5474 md_wakeup_thread(mddev
->sync_thread
);
5475 md_new_event(mddev
);
5478 mddev_unlock(mddev
);
5482 static int md_notify_reboot(struct notifier_block
*this,
5483 unsigned long code
, void *x
)
5485 struct list_head
*tmp
;
5488 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5490 printk(KERN_INFO
"md: stopping all md devices.\n");
5492 ITERATE_MDDEV(mddev
,tmp
)
5493 if (mddev_trylock(mddev
)) {
5494 do_md_stop (mddev
, 1);
5495 mddev_unlock(mddev
);
5498 * certain more exotic SCSI devices are known to be
5499 * volatile wrt too early system reboots. While the
5500 * right place to handle this issue is the given
5501 * driver, we do want to have a safe RAID driver ...
5508 static struct notifier_block md_notifier
= {
5509 .notifier_call
= md_notify_reboot
,
5511 .priority
= INT_MAX
, /* before any real devices */
5514 static void md_geninit(void)
5516 struct proc_dir_entry
*p
;
5518 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5520 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
5522 p
->proc_fops
= &md_seq_fops
;
5525 static int __init
md_init(void)
5527 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5528 " MD_SB_DISKS=%d\n",
5529 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
5530 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
5531 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
5534 if (register_blkdev(MAJOR_NR
, "md"))
5536 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5537 unregister_blkdev(MAJOR_NR
, "md");
5540 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
5541 md_probe
, NULL
, NULL
);
5542 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
5543 md_probe
, NULL
, NULL
);
5545 register_reboot_notifier(&md_notifier
);
5546 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
5556 * Searches all registered partitions for autorun RAID arrays
5559 static dev_t detected_devices
[128];
5562 void md_autodetect_dev(dev_t dev
)
5564 if (dev_cnt
>= 0 && dev_cnt
< 127)
5565 detected_devices
[dev_cnt
++] = dev
;
5569 static void autostart_arrays(int part
)
5574 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
5576 for (i
= 0; i
< dev_cnt
; i
++) {
5577 dev_t dev
= detected_devices
[i
];
5579 rdev
= md_import_device(dev
,0, 0);
5583 if (test_bit(Faulty
, &rdev
->flags
)) {
5587 list_add(&rdev
->same_set
, &pending_raid_disks
);
5591 autorun_devices(part
);
5596 static __exit
void md_exit(void)
5599 struct list_head
*tmp
;
5601 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
5602 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
5604 unregister_blkdev(MAJOR_NR
,"md");
5605 unregister_blkdev(mdp_major
, "mdp");
5606 unregister_reboot_notifier(&md_notifier
);
5607 unregister_sysctl_table(raid_table_header
);
5608 remove_proc_entry("mdstat", NULL
);
5609 ITERATE_MDDEV(mddev
,tmp
) {
5610 struct gendisk
*disk
= mddev
->gendisk
;
5613 export_array(mddev
);
5616 mddev
->gendisk
= NULL
;
5621 module_init(md_init
)
5622 module_exit(md_exit
)
5624 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5626 return sprintf(buffer
, "%d", start_readonly
);
5628 static int set_ro(const char *val
, struct kernel_param
*kp
)
5631 int num
= simple_strtoul(val
, &e
, 10);
5632 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5633 start_readonly
= num
;
5639 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
5640 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
5643 EXPORT_SYMBOL(register_md_personality
);
5644 EXPORT_SYMBOL(unregister_md_personality
);
5645 EXPORT_SYMBOL(md_error
);
5646 EXPORT_SYMBOL(md_done_sync
);
5647 EXPORT_SYMBOL(md_write_start
);
5648 EXPORT_SYMBOL(md_write_end
);
5649 EXPORT_SYMBOL(md_register_thread
);
5650 EXPORT_SYMBOL(md_unregister_thread
);
5651 EXPORT_SYMBOL(md_wakeup_thread
);
5652 EXPORT_SYMBOL(md_check_recovery
);
5653 MODULE_LICENSE("GPL");
5655 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);