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/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
45 #include <linux/poll.h>
46 #include <linux/mutex.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part
);
72 static LIST_HEAD(pers_list
);
73 static DEFINE_SPINLOCK(pers_lock
);
76 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
77 * is 1000 KB/sec, so the extra system load does not show up that much.
78 * Increase it if you want to have more _guaranteed_ speed. Note that
79 * the RAID driver will use the maximum available bandwidth if the IO
80 * subsystem is idle. There is also an 'absolute maximum' reconstruction
81 * speed limit - in case reconstruction slows down your system despite
84 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
85 * or /sys/block/mdX/md/sync_speed_{min,max}
88 static int sysctl_speed_limit_min
= 1000;
89 static int sysctl_speed_limit_max
= 200000;
90 static inline int speed_min(mddev_t
*mddev
)
92 return mddev
->sync_speed_min
?
93 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
96 static inline int speed_max(mddev_t
*mddev
)
98 return mddev
->sync_speed_max
?
99 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
102 static struct ctl_table_header
*raid_table_header
;
104 static ctl_table raid_table
[] = {
106 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
107 .procname
= "speed_limit_min",
108 .data
= &sysctl_speed_limit_min
,
109 .maxlen
= sizeof(int),
111 .proc_handler
= &proc_dointvec
,
114 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
115 .procname
= "speed_limit_max",
116 .data
= &sysctl_speed_limit_max
,
117 .maxlen
= sizeof(int),
119 .proc_handler
= &proc_dointvec
,
124 static ctl_table raid_dir_table
[] = {
126 .ctl_name
= DEV_RAID
,
135 static ctl_table raid_root_table
[] = {
141 .child
= raid_dir_table
,
146 static struct block_device_operations md_fops
;
148 static int start_readonly
;
151 * We have a system wide 'event count' that is incremented
152 * on any 'interesting' event, and readers of /proc/mdstat
153 * can use 'poll' or 'select' to find out when the event
157 * start array, stop array, error, add device, remove device,
158 * start build, activate spare
160 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
161 static atomic_t md_event_count
;
162 void md_new_event(mddev_t
*mddev
)
164 atomic_inc(&md_event_count
);
165 wake_up(&md_event_waiters
);
167 EXPORT_SYMBOL_GPL(md_new_event
);
170 * Enables to iterate over all existing md arrays
171 * all_mddevs_lock protects this list.
173 static LIST_HEAD(all_mddevs
);
174 static DEFINE_SPINLOCK(all_mddevs_lock
);
178 * iterates through all used mddevs in the system.
179 * We take care to grab the all_mddevs_lock whenever navigating
180 * the list, and to always hold a refcount when unlocked.
181 * Any code which breaks out of this loop while own
182 * a reference to the current mddev and must mddev_put it.
184 #define ITERATE_MDDEV(mddev,tmp) \
186 for (({ spin_lock(&all_mddevs_lock); \
187 tmp = all_mddevs.next; \
189 ({ if (tmp != &all_mddevs) \
190 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
191 spin_unlock(&all_mddevs_lock); \
192 if (mddev) mddev_put(mddev); \
193 mddev = list_entry(tmp, mddev_t, all_mddevs); \
194 tmp != &all_mddevs;}); \
195 ({ spin_lock(&all_mddevs_lock); \
200 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
202 bio_io_error(bio
, bio
->bi_size
);
206 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
208 atomic_inc(&mddev
->active
);
212 static void mddev_put(mddev_t
*mddev
)
214 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
216 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
217 list_del(&mddev
->all_mddevs
);
219 blk_cleanup_queue(mddev
->queue
);
220 /* that also blocks */
221 kobject_unregister(&mddev
->kobj
);
222 /* result blows... */
224 spin_unlock(&all_mddevs_lock
);
227 static mddev_t
* mddev_find(dev_t unit
)
229 mddev_t
*mddev
, *new = NULL
;
232 spin_lock(&all_mddevs_lock
);
233 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
234 if (mddev
->unit
== unit
) {
236 spin_unlock(&all_mddevs_lock
);
242 list_add(&new->all_mddevs
, &all_mddevs
);
243 spin_unlock(&all_mddevs_lock
);
246 spin_unlock(&all_mddevs_lock
);
248 new = kzalloc(sizeof(*new), GFP_KERNEL
);
253 if (MAJOR(unit
) == MD_MAJOR
)
254 new->md_minor
= MINOR(unit
);
256 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
258 init_MUTEX(&new->reconfig_sem
);
259 INIT_LIST_HEAD(&new->disks
);
260 INIT_LIST_HEAD(&new->all_mddevs
);
261 init_timer(&new->safemode_timer
);
262 atomic_set(&new->active
, 1);
263 spin_lock_init(&new->write_lock
);
264 init_waitqueue_head(&new->sb_wait
);
266 new->queue
= blk_alloc_queue(GFP_KERNEL
);
271 set_bit(QUEUE_FLAG_CLUSTER
, &new->queue
->queue_flags
);
273 blk_queue_make_request(new->queue
, md_fail_request
);
278 static inline int mddev_lock(mddev_t
* mddev
)
280 return down_interruptible(&mddev
->reconfig_sem
);
283 static inline void mddev_lock_uninterruptible(mddev_t
* mddev
)
285 down(&mddev
->reconfig_sem
);
288 static inline int mddev_trylock(mddev_t
* mddev
)
290 return down_trylock(&mddev
->reconfig_sem
);
293 static inline void mddev_unlock(mddev_t
* mddev
)
295 up(&mddev
->reconfig_sem
);
297 md_wakeup_thread(mddev
->thread
);
300 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
303 struct list_head
*tmp
;
305 ITERATE_RDEV(mddev
,rdev
,tmp
) {
306 if (rdev
->desc_nr
== nr
)
312 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
314 struct list_head
*tmp
;
317 ITERATE_RDEV(mddev
,rdev
,tmp
) {
318 if (rdev
->bdev
->bd_dev
== dev
)
324 static struct mdk_personality
*find_pers(int level
, char *clevel
)
326 struct mdk_personality
*pers
;
327 list_for_each_entry(pers
, &pers_list
, list
) {
328 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
330 if (strcmp(pers
->name
, clevel
)==0)
336 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
338 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
339 return MD_NEW_SIZE_BLOCKS(size
);
342 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
346 size
= rdev
->sb_offset
;
349 size
&= ~((sector_t
)chunk_size
/1024 - 1);
353 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
358 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
359 if (!rdev
->sb_page
) {
360 printk(KERN_ALERT
"md: out of memory.\n");
367 static void free_disk_sb(mdk_rdev_t
* rdev
)
370 put_page(rdev
->sb_page
);
372 rdev
->sb_page
= NULL
;
379 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
381 mdk_rdev_t
*rdev
= bio
->bi_private
;
382 mddev_t
*mddev
= rdev
->mddev
;
386 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
387 md_error(mddev
, rdev
);
389 if (atomic_dec_and_test(&mddev
->pending_writes
))
390 wake_up(&mddev
->sb_wait
);
395 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
397 struct bio
*bio2
= bio
->bi_private
;
398 mdk_rdev_t
*rdev
= bio2
->bi_private
;
399 mddev_t
*mddev
= rdev
->mddev
;
403 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
404 error
== -EOPNOTSUPP
) {
406 /* barriers don't appear to be supported :-( */
407 set_bit(BarriersNotsupp
, &rdev
->flags
);
408 mddev
->barriers_work
= 0;
409 spin_lock_irqsave(&mddev
->write_lock
, flags
);
410 bio2
->bi_next
= mddev
->biolist
;
411 mddev
->biolist
= bio2
;
412 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
413 wake_up(&mddev
->sb_wait
);
418 bio
->bi_private
= rdev
;
419 return super_written(bio
, bytes_done
, error
);
422 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
423 sector_t sector
, int size
, struct page
*page
)
425 /* write first size bytes of page to sector of rdev
426 * Increment mddev->pending_writes before returning
427 * and decrement it on completion, waking up sb_wait
428 * if zero is reached.
429 * If an error occurred, call md_error
431 * As we might need to resubmit the request if BIO_RW_BARRIER
432 * causes ENOTSUPP, we allocate a spare bio...
434 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
435 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
437 bio
->bi_bdev
= rdev
->bdev
;
438 bio
->bi_sector
= sector
;
439 bio_add_page(bio
, page
, size
, 0);
440 bio
->bi_private
= rdev
;
441 bio
->bi_end_io
= super_written
;
444 atomic_inc(&mddev
->pending_writes
);
445 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
447 rw
|= (1<<BIO_RW_BARRIER
);
448 rbio
= bio_clone(bio
, GFP_NOIO
);
449 rbio
->bi_private
= bio
;
450 rbio
->bi_end_io
= super_written_barrier
;
451 submit_bio(rw
, rbio
);
456 void md_super_wait(mddev_t
*mddev
)
458 /* wait for all superblock writes that were scheduled to complete.
459 * if any had to be retried (due to BARRIER problems), retry them
463 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
464 if (atomic_read(&mddev
->pending_writes
)==0)
466 while (mddev
->biolist
) {
468 spin_lock_irq(&mddev
->write_lock
);
469 bio
= mddev
->biolist
;
470 mddev
->biolist
= bio
->bi_next
;
472 spin_unlock_irq(&mddev
->write_lock
);
473 submit_bio(bio
->bi_rw
, bio
);
477 finish_wait(&mddev
->sb_wait
, &wq
);
480 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
485 complete((struct completion
*)bio
->bi_private
);
489 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
490 struct page
*page
, int rw
)
492 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
493 struct completion event
;
496 rw
|= (1 << BIO_RW_SYNC
);
499 bio
->bi_sector
= sector
;
500 bio_add_page(bio
, page
, size
, 0);
501 init_completion(&event
);
502 bio
->bi_private
= &event
;
503 bio
->bi_end_io
= bi_complete
;
505 wait_for_completion(&event
);
507 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
511 EXPORT_SYMBOL_GPL(sync_page_io
);
513 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
515 char b
[BDEVNAME_SIZE
];
516 if (!rdev
->sb_page
) {
524 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
530 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
531 bdevname(rdev
->bdev
,b
));
535 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
537 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
538 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
539 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
540 (sb1
->set_uuid3
== sb2
->set_uuid3
))
548 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
551 mdp_super_t
*tmp1
, *tmp2
;
553 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
554 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
556 if (!tmp1
|| !tmp2
) {
558 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
566 * nr_disks is not constant
571 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
582 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
584 unsigned int disk_csum
, csum
;
586 disk_csum
= sb
->sb_csum
;
588 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
589 sb
->sb_csum
= disk_csum
;
595 * Handle superblock details.
596 * We want to be able to handle multiple superblock formats
597 * so we have a common interface to them all, and an array of
598 * different handlers.
599 * We rely on user-space to write the initial superblock, and support
600 * reading and updating of superblocks.
601 * Interface methods are:
602 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
603 * loads and validates a superblock on dev.
604 * if refdev != NULL, compare superblocks on both devices
606 * 0 - dev has a superblock that is compatible with refdev
607 * 1 - dev has a superblock that is compatible and newer than refdev
608 * so dev should be used as the refdev in future
609 * -EINVAL superblock incompatible or invalid
610 * -othererror e.g. -EIO
612 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
613 * Verify that dev is acceptable into mddev.
614 * The first time, mddev->raid_disks will be 0, and data from
615 * dev should be merged in. Subsequent calls check that dev
616 * is new enough. Return 0 or -EINVAL
618 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
619 * Update the superblock for rdev with data in mddev
620 * This does not write to disc.
626 struct module
*owner
;
627 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
628 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
629 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
633 * load_super for 0.90.0
635 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
637 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
643 * Calculate the position of the superblock,
644 * it's at the end of the disk.
646 * It also happens to be a multiple of 4Kb.
648 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
649 rdev
->sb_offset
= sb_offset
;
651 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
656 bdevname(rdev
->bdev
, b
);
657 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
659 if (sb
->md_magic
!= MD_SB_MAGIC
) {
660 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
665 if (sb
->major_version
!= 0 ||
666 sb
->minor_version
< 90 ||
667 sb
->minor_version
> 91) {
668 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
669 sb
->major_version
, sb
->minor_version
,
674 if (sb
->raid_disks
<= 0)
677 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
678 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
683 rdev
->preferred_minor
= sb
->md_minor
;
684 rdev
->data_offset
= 0;
685 rdev
->sb_size
= MD_SB_BYTES
;
687 if (sb
->level
== LEVEL_MULTIPATH
)
690 rdev
->desc_nr
= sb
->this_disk
.number
;
696 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
697 if (!uuid_equal(refsb
, sb
)) {
698 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
699 b
, bdevname(refdev
->bdev
,b2
));
702 if (!sb_equal(refsb
, sb
)) {
703 printk(KERN_WARNING
"md: %s has same UUID"
704 " but different superblock to %s\n",
705 b
, bdevname(refdev
->bdev
, b2
));
709 ev2
= md_event(refsb
);
715 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
717 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
718 /* "this cannot possibly happen" ... */
726 * validate_super for 0.90.0
728 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
731 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
733 rdev
->raid_disk
= -1;
735 if (mddev
->raid_disks
== 0) {
736 mddev
->major_version
= 0;
737 mddev
->minor_version
= sb
->minor_version
;
738 mddev
->patch_version
= sb
->patch_version
;
739 mddev
->persistent
= ! sb
->not_persistent
;
740 mddev
->chunk_size
= sb
->chunk_size
;
741 mddev
->ctime
= sb
->ctime
;
742 mddev
->utime
= sb
->utime
;
743 mddev
->level
= sb
->level
;
744 mddev
->clevel
[0] = 0;
745 mddev
->layout
= sb
->layout
;
746 mddev
->raid_disks
= sb
->raid_disks
;
747 mddev
->size
= sb
->size
;
748 mddev
->events
= md_event(sb
);
749 mddev
->bitmap_offset
= 0;
750 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
752 if (mddev
->minor_version
>= 91) {
753 mddev
->reshape_position
= sb
->reshape_position
;
754 mddev
->delta_disks
= sb
->delta_disks
;
755 mddev
->new_level
= sb
->new_level
;
756 mddev
->new_layout
= sb
->new_layout
;
757 mddev
->new_chunk
= sb
->new_chunk
;
759 mddev
->reshape_position
= MaxSector
;
760 mddev
->delta_disks
= 0;
761 mddev
->new_level
= mddev
->level
;
762 mddev
->new_layout
= mddev
->layout
;
763 mddev
->new_chunk
= mddev
->chunk_size
;
766 if (sb
->state
& (1<<MD_SB_CLEAN
))
767 mddev
->recovery_cp
= MaxSector
;
769 if (sb
->events_hi
== sb
->cp_events_hi
&&
770 sb
->events_lo
== sb
->cp_events_lo
) {
771 mddev
->recovery_cp
= sb
->recovery_cp
;
773 mddev
->recovery_cp
= 0;
776 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
777 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
778 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
779 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
781 mddev
->max_disks
= MD_SB_DISKS
;
783 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
784 mddev
->bitmap_file
== NULL
) {
785 if (mddev
->level
!= 1 && mddev
->level
!= 4
786 && mddev
->level
!= 5 && mddev
->level
!= 6
787 && mddev
->level
!= 10) {
788 /* FIXME use a better test */
789 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
792 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
795 } else if (mddev
->pers
== NULL
) {
796 /* Insist on good event counter while assembling */
797 __u64 ev1
= md_event(sb
);
799 if (ev1
< mddev
->events
)
801 } else if (mddev
->bitmap
) {
802 /* if adding to array with a bitmap, then we can accept an
803 * older device ... but not too old.
805 __u64 ev1
= md_event(sb
);
806 if (ev1
< mddev
->bitmap
->events_cleared
)
808 } else /* just a hot-add of a new device, leave raid_disk at -1 */
811 if (mddev
->level
!= LEVEL_MULTIPATH
) {
812 desc
= sb
->disks
+ rdev
->desc_nr
;
814 if (desc
->state
& (1<<MD_DISK_FAULTY
))
815 set_bit(Faulty
, &rdev
->flags
);
816 else if (desc
->state
& (1<<MD_DISK_SYNC
) &&
817 desc
->raid_disk
< mddev
->raid_disks
) {
818 set_bit(In_sync
, &rdev
->flags
);
819 rdev
->raid_disk
= desc
->raid_disk
;
821 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
822 set_bit(WriteMostly
, &rdev
->flags
);
823 } else /* MULTIPATH are always insync */
824 set_bit(In_sync
, &rdev
->flags
);
829 * sync_super for 0.90.0
831 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
834 struct list_head
*tmp
;
836 int next_spare
= mddev
->raid_disks
;
839 /* make rdev->sb match mddev data..
842 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
843 * 3/ any empty disks < next_spare become removed
845 * disks[0] gets initialised to REMOVED because
846 * we cannot be sure from other fields if it has
847 * been initialised or not.
850 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
852 rdev
->sb_size
= MD_SB_BYTES
;
854 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
856 memset(sb
, 0, sizeof(*sb
));
858 sb
->md_magic
= MD_SB_MAGIC
;
859 sb
->major_version
= mddev
->major_version
;
860 sb
->patch_version
= mddev
->patch_version
;
861 sb
->gvalid_words
= 0; /* ignored */
862 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
863 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
864 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
865 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
867 sb
->ctime
= mddev
->ctime
;
868 sb
->level
= mddev
->level
;
869 sb
->size
= mddev
->size
;
870 sb
->raid_disks
= mddev
->raid_disks
;
871 sb
->md_minor
= mddev
->md_minor
;
872 sb
->not_persistent
= !mddev
->persistent
;
873 sb
->utime
= mddev
->utime
;
875 sb
->events_hi
= (mddev
->events
>>32);
876 sb
->events_lo
= (u32
)mddev
->events
;
878 if (mddev
->reshape_position
== MaxSector
)
879 sb
->minor_version
= 90;
881 sb
->minor_version
= 91;
882 sb
->reshape_position
= mddev
->reshape_position
;
883 sb
->new_level
= mddev
->new_level
;
884 sb
->delta_disks
= mddev
->delta_disks
;
885 sb
->new_layout
= mddev
->new_layout
;
886 sb
->new_chunk
= mddev
->new_chunk
;
888 mddev
->minor_version
= sb
->minor_version
;
891 sb
->recovery_cp
= mddev
->recovery_cp
;
892 sb
->cp_events_hi
= (mddev
->events
>>32);
893 sb
->cp_events_lo
= (u32
)mddev
->events
;
894 if (mddev
->recovery_cp
== MaxSector
)
895 sb
->state
= (1<< MD_SB_CLEAN
);
899 sb
->layout
= mddev
->layout
;
900 sb
->chunk_size
= mddev
->chunk_size
;
902 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
903 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
905 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
906 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
909 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
910 && !test_bit(Faulty
, &rdev2
->flags
))
911 desc_nr
= rdev2
->raid_disk
;
913 desc_nr
= next_spare
++;
914 rdev2
->desc_nr
= desc_nr
;
915 d
= &sb
->disks
[rdev2
->desc_nr
];
917 d
->number
= rdev2
->desc_nr
;
918 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
919 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
920 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
921 && !test_bit(Faulty
, &rdev2
->flags
))
922 d
->raid_disk
= rdev2
->raid_disk
;
924 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
925 if (test_bit(Faulty
, &rdev2
->flags
))
926 d
->state
= (1<<MD_DISK_FAULTY
);
927 else if (test_bit(In_sync
, &rdev2
->flags
)) {
928 d
->state
= (1<<MD_DISK_ACTIVE
);
929 d
->state
|= (1<<MD_DISK_SYNC
);
937 if (test_bit(WriteMostly
, &rdev2
->flags
))
938 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
940 /* now set the "removed" and "faulty" bits on any missing devices */
941 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
942 mdp_disk_t
*d
= &sb
->disks
[i
];
943 if (d
->state
== 0 && d
->number
== 0) {
946 d
->state
= (1<<MD_DISK_REMOVED
);
947 d
->state
|= (1<<MD_DISK_FAULTY
);
951 sb
->nr_disks
= nr_disks
;
952 sb
->active_disks
= active
;
953 sb
->working_disks
= working
;
954 sb
->failed_disks
= failed
;
955 sb
->spare_disks
= spare
;
957 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
958 sb
->sb_csum
= calc_sb_csum(sb
);
962 * version 1 superblock
965 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
967 unsigned int disk_csum
, csum
;
968 unsigned long long newcsum
;
969 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
970 unsigned int *isuper
= (unsigned int*)sb
;
973 disk_csum
= sb
->sb_csum
;
976 for (i
=0; size
>=4; size
-= 4 )
977 newcsum
+= le32_to_cpu(*isuper
++);
980 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
982 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
983 sb
->sb_csum
= disk_csum
;
984 return cpu_to_le32(csum
);
987 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
989 struct mdp_superblock_1
*sb
;
992 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
996 * Calculate the position of the superblock.
997 * It is always aligned to a 4K boundary and
998 * depeding on minor_version, it can be:
999 * 0: At least 8K, but less than 12K, from end of device
1000 * 1: At start of device
1001 * 2: 4K from start of device.
1003 switch(minor_version
) {
1005 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1007 sb_offset
&= ~(sector_t
)(4*2-1);
1008 /* convert from sectors to K */
1020 rdev
->sb_offset
= sb_offset
;
1022 /* superblock is rarely larger than 1K, but it can be larger,
1023 * and it is safe to read 4k, so we do that
1025 ret
= read_disk_sb(rdev
, 4096);
1026 if (ret
) return ret
;
1029 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1031 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1032 sb
->major_version
!= cpu_to_le32(1) ||
1033 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1034 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1035 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1038 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1039 printk("md: invalid superblock checksum on %s\n",
1040 bdevname(rdev
->bdev
,b
));
1043 if (le64_to_cpu(sb
->data_size
) < 10) {
1044 printk("md: data_size too small on %s\n",
1045 bdevname(rdev
->bdev
,b
));
1048 rdev
->preferred_minor
= 0xffff;
1049 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1050 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1052 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1053 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1054 if (rdev
->sb_size
& bmask
)
1055 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1061 struct mdp_superblock_1
*refsb
=
1062 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1064 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1065 sb
->level
!= refsb
->level
||
1066 sb
->layout
!= refsb
->layout
||
1067 sb
->chunksize
!= refsb
->chunksize
) {
1068 printk(KERN_WARNING
"md: %s has strangely different"
1069 " superblock to %s\n",
1070 bdevname(rdev
->bdev
,b
),
1071 bdevname(refdev
->bdev
,b2
));
1074 ev1
= le64_to_cpu(sb
->events
);
1075 ev2
= le64_to_cpu(refsb
->events
);
1083 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1085 rdev
->size
= rdev
->sb_offset
;
1086 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1088 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1089 if (le32_to_cpu(sb
->chunksize
))
1090 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1092 if (le32_to_cpu(sb
->size
) > rdev
->size
*2)
1097 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1099 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1101 rdev
->raid_disk
= -1;
1103 if (mddev
->raid_disks
== 0) {
1104 mddev
->major_version
= 1;
1105 mddev
->patch_version
= 0;
1106 mddev
->persistent
= 1;
1107 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1108 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1109 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1110 mddev
->level
= le32_to_cpu(sb
->level
);
1111 mddev
->clevel
[0] = 0;
1112 mddev
->layout
= le32_to_cpu(sb
->layout
);
1113 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1114 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1115 mddev
->events
= le64_to_cpu(sb
->events
);
1116 mddev
->bitmap_offset
= 0;
1117 mddev
->default_bitmap_offset
= 1024 >> 9;
1119 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1120 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1122 mddev
->max_disks
= (4096-256)/2;
1124 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1125 mddev
->bitmap_file
== NULL
) {
1126 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
1127 && mddev
->level
!= 10) {
1128 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
1131 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1133 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1134 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1135 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1136 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1137 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1138 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1140 mddev
->reshape_position
= MaxSector
;
1141 mddev
->delta_disks
= 0;
1142 mddev
->new_level
= mddev
->level
;
1143 mddev
->new_layout
= mddev
->layout
;
1144 mddev
->new_chunk
= mddev
->chunk_size
;
1147 } else if (mddev
->pers
== NULL
) {
1148 /* Insist of good event counter while assembling */
1149 __u64 ev1
= le64_to_cpu(sb
->events
);
1151 if (ev1
< mddev
->events
)
1153 } else if (mddev
->bitmap
) {
1154 /* If adding to array with a bitmap, then we can accept an
1155 * older device, but not too old.
1157 __u64 ev1
= le64_to_cpu(sb
->events
);
1158 if (ev1
< mddev
->bitmap
->events_cleared
)
1160 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1163 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1165 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1166 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1168 case 0xffff: /* spare */
1170 case 0xfffe: /* faulty */
1171 set_bit(Faulty
, &rdev
->flags
);
1174 set_bit(In_sync
, &rdev
->flags
);
1175 rdev
->raid_disk
= role
;
1178 if (sb
->devflags
& WriteMostly1
)
1179 set_bit(WriteMostly
, &rdev
->flags
);
1180 } else /* MULTIPATH are always insync */
1181 set_bit(In_sync
, &rdev
->flags
);
1186 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1188 struct mdp_superblock_1
*sb
;
1189 struct list_head
*tmp
;
1192 /* make rdev->sb match mddev and rdev data. */
1194 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1196 sb
->feature_map
= 0;
1198 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1199 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1200 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1202 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1203 sb
->events
= cpu_to_le64(mddev
->events
);
1205 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1207 sb
->resync_offset
= cpu_to_le64(0);
1209 sb
->cnt_corrected_read
= atomic_read(&rdev
->corrected_errors
);
1211 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1212 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1214 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1215 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1216 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1218 if (mddev
->reshape_position
!= MaxSector
) {
1219 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1220 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1221 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1222 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1223 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1224 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1228 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1229 if (rdev2
->desc_nr
+1 > max_dev
)
1230 max_dev
= rdev2
->desc_nr
+1;
1232 sb
->max_dev
= cpu_to_le32(max_dev
);
1233 for (i
=0; i
<max_dev
;i
++)
1234 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1236 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1238 if (test_bit(Faulty
, &rdev2
->flags
))
1239 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1240 else if (test_bit(In_sync
, &rdev2
->flags
))
1241 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1243 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1246 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1247 sb
->sb_csum
= calc_sb_1_csum(sb
);
1251 static struct super_type super_types
[] = {
1254 .owner
= THIS_MODULE
,
1255 .load_super
= super_90_load
,
1256 .validate_super
= super_90_validate
,
1257 .sync_super
= super_90_sync
,
1261 .owner
= THIS_MODULE
,
1262 .load_super
= super_1_load
,
1263 .validate_super
= super_1_validate
,
1264 .sync_super
= super_1_sync
,
1268 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1270 struct list_head
*tmp
;
1273 ITERATE_RDEV(mddev
,rdev
,tmp
)
1274 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1280 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1282 struct list_head
*tmp
;
1285 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1286 if (match_dev_unit(mddev2
, rdev
))
1292 static LIST_HEAD(pending_raid_disks
);
1294 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1296 mdk_rdev_t
*same_pdev
;
1297 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1305 /* make sure rdev->size exceeds mddev->size */
1306 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1308 /* Cannot change size, so fail */
1311 mddev
->size
= rdev
->size
;
1313 same_pdev
= match_dev_unit(mddev
, rdev
);
1316 "%s: WARNING: %s appears to be on the same physical"
1317 " disk as %s. True\n protection against single-disk"
1318 " failure might be compromised.\n",
1319 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1320 bdevname(same_pdev
->bdev
,b2
));
1322 /* Verify rdev->desc_nr is unique.
1323 * If it is -1, assign a free number, else
1324 * check number is not in use
1326 if (rdev
->desc_nr
< 0) {
1328 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1329 while (find_rdev_nr(mddev
, choice
))
1331 rdev
->desc_nr
= choice
;
1333 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1336 bdevname(rdev
->bdev
,b
);
1337 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1339 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1342 list_add(&rdev
->same_set
, &mddev
->disks
);
1343 rdev
->mddev
= mddev
;
1344 printk(KERN_INFO
"md: bind<%s>\n", b
);
1346 rdev
->kobj
.parent
= &mddev
->kobj
;
1347 kobject_add(&rdev
->kobj
);
1349 if (rdev
->bdev
->bd_part
)
1350 ko
= &rdev
->bdev
->bd_part
->kobj
;
1352 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1353 sysfs_create_link(&rdev
->kobj
, ko
, "block");
1354 bd_claim_by_disk(rdev
->bdev
, rdev
, mddev
->gendisk
);
1358 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1360 char b
[BDEVNAME_SIZE
];
1365 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1366 list_del_init(&rdev
->same_set
);
1367 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1369 sysfs_remove_link(&rdev
->kobj
, "block");
1370 kobject_del(&rdev
->kobj
);
1374 * prevent the device from being mounted, repartitioned or
1375 * otherwise reused by a RAID array (or any other kernel
1376 * subsystem), by bd_claiming the device.
1378 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1381 struct block_device
*bdev
;
1382 char b
[BDEVNAME_SIZE
];
1384 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1386 printk(KERN_ERR
"md: could not open %s.\n",
1387 __bdevname(dev
, b
));
1388 return PTR_ERR(bdev
);
1390 err
= bd_claim(bdev
, rdev
);
1392 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1401 static void unlock_rdev(mdk_rdev_t
*rdev
)
1403 struct block_device
*bdev
= rdev
->bdev
;
1411 void md_autodetect_dev(dev_t dev
);
1413 static void export_rdev(mdk_rdev_t
* rdev
)
1415 char b
[BDEVNAME_SIZE
];
1416 printk(KERN_INFO
"md: export_rdev(%s)\n",
1417 bdevname(rdev
->bdev
,b
));
1421 list_del_init(&rdev
->same_set
);
1423 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1426 kobject_put(&rdev
->kobj
);
1429 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1431 unbind_rdev_from_array(rdev
);
1435 static void export_array(mddev_t
*mddev
)
1437 struct list_head
*tmp
;
1440 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1445 kick_rdev_from_array(rdev
);
1447 if (!list_empty(&mddev
->disks
))
1449 mddev
->raid_disks
= 0;
1450 mddev
->major_version
= 0;
1453 static void print_desc(mdp_disk_t
*desc
)
1455 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1456 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1459 static void print_sb(mdp_super_t
*sb
)
1464 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1465 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1466 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1468 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1469 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1470 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1471 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1472 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1473 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1474 sb
->failed_disks
, sb
->spare_disks
,
1475 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1478 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1481 desc
= sb
->disks
+ i
;
1482 if (desc
->number
|| desc
->major
|| desc
->minor
||
1483 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1484 printk(" D %2d: ", i
);
1488 printk(KERN_INFO
"md: THIS: ");
1489 print_desc(&sb
->this_disk
);
1493 static void print_rdev(mdk_rdev_t
*rdev
)
1495 char b
[BDEVNAME_SIZE
];
1496 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1497 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1498 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1500 if (rdev
->sb_loaded
) {
1501 printk(KERN_INFO
"md: rdev superblock:\n");
1502 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1504 printk(KERN_INFO
"md: no rdev superblock!\n");
1507 void md_print_devices(void)
1509 struct list_head
*tmp
, *tmp2
;
1512 char b
[BDEVNAME_SIZE
];
1515 printk("md: **********************************\n");
1516 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1517 printk("md: **********************************\n");
1518 ITERATE_MDDEV(mddev
,tmp
) {
1521 bitmap_print_sb(mddev
->bitmap
);
1523 printk("%s: ", mdname(mddev
));
1524 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1525 printk("<%s>", bdevname(rdev
->bdev
,b
));
1528 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1531 printk("md: **********************************\n");
1536 static void sync_sbs(mddev_t
* mddev
)
1539 struct list_head
*tmp
;
1541 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1542 super_types
[mddev
->major_version
].
1543 sync_super(mddev
, rdev
);
1544 rdev
->sb_loaded
= 1;
1548 void md_update_sb(mddev_t
* mddev
)
1551 struct list_head
*tmp
;
1556 spin_lock_irq(&mddev
->write_lock
);
1557 sync_req
= mddev
->in_sync
;
1558 mddev
->utime
= get_seconds();
1561 if (!mddev
->events
) {
1563 * oops, this 64-bit counter should never wrap.
1564 * Either we are in around ~1 trillion A.C., assuming
1565 * 1 reboot per second, or we have a bug:
1570 mddev
->sb_dirty
= 2;
1574 * do not write anything to disk if using
1575 * nonpersistent superblocks
1577 if (!mddev
->persistent
) {
1578 mddev
->sb_dirty
= 0;
1579 spin_unlock_irq(&mddev
->write_lock
);
1580 wake_up(&mddev
->sb_wait
);
1583 spin_unlock_irq(&mddev
->write_lock
);
1586 "md: updating %s RAID superblock on device (in sync %d)\n",
1587 mdname(mddev
),mddev
->in_sync
);
1589 err
= bitmap_update_sb(mddev
->bitmap
);
1590 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1591 char b
[BDEVNAME_SIZE
];
1592 dprintk(KERN_INFO
"md: ");
1593 if (test_bit(Faulty
, &rdev
->flags
))
1594 dprintk("(skipping faulty ");
1596 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1597 if (!test_bit(Faulty
, &rdev
->flags
)) {
1598 md_super_write(mddev
,rdev
,
1599 rdev
->sb_offset
<<1, rdev
->sb_size
,
1601 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1602 bdevname(rdev
->bdev
,b
),
1603 (unsigned long long)rdev
->sb_offset
);
1607 if (mddev
->level
== LEVEL_MULTIPATH
)
1608 /* only need to write one superblock... */
1611 md_super_wait(mddev
);
1612 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1614 spin_lock_irq(&mddev
->write_lock
);
1615 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1616 /* have to write it out again */
1617 spin_unlock_irq(&mddev
->write_lock
);
1620 mddev
->sb_dirty
= 0;
1621 spin_unlock_irq(&mddev
->write_lock
);
1622 wake_up(&mddev
->sb_wait
);
1625 EXPORT_SYMBOL_GPL(md_update_sb
);
1627 /* words written to sysfs files may, or my not, be \n terminated.
1628 * We want to accept with case. For this we use cmd_match.
1630 static int cmd_match(const char *cmd
, const char *str
)
1632 /* See if cmd, written into a sysfs file, matches
1633 * str. They must either be the same, or cmd can
1634 * have a trailing newline
1636 while (*cmd
&& *str
&& *cmd
== *str
) {
1647 struct rdev_sysfs_entry
{
1648 struct attribute attr
;
1649 ssize_t (*show
)(mdk_rdev_t
*, char *);
1650 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1654 state_show(mdk_rdev_t
*rdev
, char *page
)
1659 if (test_bit(Faulty
, &rdev
->flags
)) {
1660 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1663 if (test_bit(In_sync
, &rdev
->flags
)) {
1664 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1667 if (!test_bit(Faulty
, &rdev
->flags
) &&
1668 !test_bit(In_sync
, &rdev
->flags
)) {
1669 len
+= sprintf(page
+len
, "%sspare", sep
);
1672 return len
+sprintf(page
+len
, "\n");
1675 static struct rdev_sysfs_entry
1676 rdev_state
= __ATTR_RO(state
);
1679 super_show(mdk_rdev_t
*rdev
, char *page
)
1681 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1682 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1683 return rdev
->sb_size
;
1687 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1690 errors_show(mdk_rdev_t
*rdev
, char *page
)
1692 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1696 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1699 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1700 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1701 atomic_set(&rdev
->corrected_errors
, n
);
1706 static struct rdev_sysfs_entry rdev_errors
=
1707 __ATTR(errors
, 0644, errors_show
, errors_store
);
1710 slot_show(mdk_rdev_t
*rdev
, char *page
)
1712 if (rdev
->raid_disk
< 0)
1713 return sprintf(page
, "none\n");
1715 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1719 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1722 int slot
= simple_strtoul(buf
, &e
, 10);
1723 if (strncmp(buf
, "none", 4)==0)
1725 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1727 if (rdev
->mddev
->pers
)
1728 /* Cannot set slot in active array (yet) */
1730 if (slot
>= rdev
->mddev
->raid_disks
)
1732 rdev
->raid_disk
= slot
;
1733 /* assume it is working */
1735 set_bit(In_sync
, &rdev
->flags
);
1740 static struct rdev_sysfs_entry rdev_slot
=
1741 __ATTR(slot
, 0644, slot_show
, slot_store
);
1744 offset_show(mdk_rdev_t
*rdev
, char *page
)
1746 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1750 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1753 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1754 if (e
==buf
|| (*e
&& *e
!= '\n'))
1756 if (rdev
->mddev
->pers
)
1758 rdev
->data_offset
= offset
;
1762 static struct rdev_sysfs_entry rdev_offset
=
1763 __ATTR(offset
, 0644, offset_show
, offset_store
);
1766 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1768 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1772 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1775 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1776 if (e
==buf
|| (*e
&& *e
!= '\n'))
1778 if (rdev
->mddev
->pers
)
1781 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1782 rdev
->mddev
->size
= size
;
1786 static struct rdev_sysfs_entry rdev_size
=
1787 __ATTR(size
, 0644, rdev_size_show
, rdev_size_store
);
1789 static struct attribute
*rdev_default_attrs
[] = {
1799 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1801 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1802 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1806 return entry
->show(rdev
, page
);
1810 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1811 const char *page
, size_t length
)
1813 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1814 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1818 return entry
->store(rdev
, page
, length
);
1821 static void rdev_free(struct kobject
*ko
)
1823 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1826 static struct sysfs_ops rdev_sysfs_ops
= {
1827 .show
= rdev_attr_show
,
1828 .store
= rdev_attr_store
,
1830 static struct kobj_type rdev_ktype
= {
1831 .release
= rdev_free
,
1832 .sysfs_ops
= &rdev_sysfs_ops
,
1833 .default_attrs
= rdev_default_attrs
,
1837 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1839 * mark the device faulty if:
1841 * - the device is nonexistent (zero size)
1842 * - the device has no valid superblock
1844 * a faulty rdev _never_ has rdev->sb set.
1846 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1848 char b
[BDEVNAME_SIZE
];
1853 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
1855 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1856 return ERR_PTR(-ENOMEM
);
1859 if ((err
= alloc_disk_sb(rdev
)))
1862 err
= lock_rdev(rdev
, newdev
);
1866 rdev
->kobj
.parent
= NULL
;
1867 rdev
->kobj
.ktype
= &rdev_ktype
;
1868 kobject_init(&rdev
->kobj
);
1872 rdev
->data_offset
= 0;
1873 atomic_set(&rdev
->nr_pending
, 0);
1874 atomic_set(&rdev
->read_errors
, 0);
1875 atomic_set(&rdev
->corrected_errors
, 0);
1877 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1880 "md: %s has zero or unknown size, marking faulty!\n",
1881 bdevname(rdev
->bdev
,b
));
1886 if (super_format
>= 0) {
1887 err
= super_types
[super_format
].
1888 load_super(rdev
, NULL
, super_minor
);
1889 if (err
== -EINVAL
) {
1891 "md: %s has invalid sb, not importing!\n",
1892 bdevname(rdev
->bdev
,b
));
1897 "md: could not read %s's sb, not importing!\n",
1898 bdevname(rdev
->bdev
,b
));
1902 INIT_LIST_HEAD(&rdev
->same_set
);
1907 if (rdev
->sb_page
) {
1913 return ERR_PTR(err
);
1917 * Check a full RAID array for plausibility
1921 static void analyze_sbs(mddev_t
* mddev
)
1924 struct list_head
*tmp
;
1925 mdk_rdev_t
*rdev
, *freshest
;
1926 char b
[BDEVNAME_SIZE
];
1929 ITERATE_RDEV(mddev
,rdev
,tmp
)
1930 switch (super_types
[mddev
->major_version
].
1931 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1939 "md: fatal superblock inconsistency in %s"
1940 " -- removing from array\n",
1941 bdevname(rdev
->bdev
,b
));
1942 kick_rdev_from_array(rdev
);
1946 super_types
[mddev
->major_version
].
1947 validate_super(mddev
, freshest
);
1950 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1951 if (rdev
!= freshest
)
1952 if (super_types
[mddev
->major_version
].
1953 validate_super(mddev
, rdev
)) {
1954 printk(KERN_WARNING
"md: kicking non-fresh %s"
1956 bdevname(rdev
->bdev
,b
));
1957 kick_rdev_from_array(rdev
);
1960 if (mddev
->level
== LEVEL_MULTIPATH
) {
1961 rdev
->desc_nr
= i
++;
1962 rdev
->raid_disk
= rdev
->desc_nr
;
1963 set_bit(In_sync
, &rdev
->flags
);
1969 if (mddev
->recovery_cp
!= MaxSector
&&
1971 printk(KERN_ERR
"md: %s: raid array is not clean"
1972 " -- starting background reconstruction\n",
1978 level_show(mddev_t
*mddev
, char *page
)
1980 struct mdk_personality
*p
= mddev
->pers
;
1982 return sprintf(page
, "%s\n", p
->name
);
1983 else if (mddev
->clevel
[0])
1984 return sprintf(page
, "%s\n", mddev
->clevel
);
1985 else if (mddev
->level
!= LEVEL_NONE
)
1986 return sprintf(page
, "%d\n", mddev
->level
);
1992 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1999 if (len
>= sizeof(mddev
->clevel
))
2001 strncpy(mddev
->clevel
, buf
, len
);
2002 if (mddev
->clevel
[len
-1] == '\n')
2004 mddev
->clevel
[len
] = 0;
2005 mddev
->level
= LEVEL_NONE
;
2009 static struct md_sysfs_entry md_level
=
2010 __ATTR(level
, 0644, level_show
, level_store
);
2013 raid_disks_show(mddev_t
*mddev
, char *page
)
2015 if (mddev
->raid_disks
== 0)
2017 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2020 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2023 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2025 /* can only set raid_disks if array is not yet active */
2028 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2030 if (!*buf
|| (*e
&& *e
!= '\n'))
2034 rv
= update_raid_disks(mddev
, n
);
2036 mddev
->raid_disks
= n
;
2037 return rv
? rv
: len
;
2039 static struct md_sysfs_entry md_raid_disks
=
2040 __ATTR(raid_disks
, 0644, raid_disks_show
, raid_disks_store
);
2043 chunk_size_show(mddev_t
*mddev
, char *page
)
2045 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2049 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2051 /* can only set chunk_size if array is not yet active */
2053 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2057 if (!*buf
|| (*e
&& *e
!= '\n'))
2060 mddev
->chunk_size
= n
;
2063 static struct md_sysfs_entry md_chunk_size
=
2064 __ATTR(chunk_size
, 0644, chunk_size_show
, chunk_size_store
);
2067 null_show(mddev_t
*mddev
, char *page
)
2073 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2075 /* buf must be %d:%d\n? giving major and minor numbers */
2076 /* The new device is added to the array.
2077 * If the array has a persistent superblock, we read the
2078 * superblock to initialise info and check validity.
2079 * Otherwise, only checking done is that in bind_rdev_to_array,
2080 * which mainly checks size.
2083 int major
= simple_strtoul(buf
, &e
, 10);
2089 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2091 minor
= simple_strtoul(e
+1, &e
, 10);
2092 if (*e
&& *e
!= '\n')
2094 dev
= MKDEV(major
, minor
);
2095 if (major
!= MAJOR(dev
) ||
2096 minor
!= MINOR(dev
))
2100 if (mddev
->persistent
) {
2101 rdev
= md_import_device(dev
, mddev
->major_version
,
2102 mddev
->minor_version
);
2103 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2104 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2105 mdk_rdev_t
, same_set
);
2106 err
= super_types
[mddev
->major_version
]
2107 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2112 rdev
= md_import_device(dev
, -1, -1);
2115 return PTR_ERR(rdev
);
2116 err
= bind_rdev_to_array(rdev
, mddev
);
2120 return err
? err
: len
;
2123 static struct md_sysfs_entry md_new_device
=
2124 __ATTR(new_dev
, 0200, null_show
, new_dev_store
);
2127 size_show(mddev_t
*mddev
, char *page
)
2129 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2132 static int update_size(mddev_t
*mddev
, unsigned long size
);
2135 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2137 /* If array is inactive, we can reduce the component size, but
2138 * not increase it (except from 0).
2139 * If array is active, we can try an on-line resize
2143 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2144 if (!*buf
|| *buf
== '\n' ||
2149 err
= update_size(mddev
, size
);
2150 md_update_sb(mddev
);
2152 if (mddev
->size
== 0 ||
2158 return err
? err
: len
;
2161 static struct md_sysfs_entry md_size
=
2162 __ATTR(component_size
, 0644, size_show
, size_store
);
2166 * This is either 'none' for arrays with externally managed metadata,
2167 * or N.M for internally known formats
2170 metadata_show(mddev_t
*mddev
, char *page
)
2172 if (mddev
->persistent
)
2173 return sprintf(page
, "%d.%d\n",
2174 mddev
->major_version
, mddev
->minor_version
);
2176 return sprintf(page
, "none\n");
2180 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2184 if (!list_empty(&mddev
->disks
))
2187 if (cmd_match(buf
, "none")) {
2188 mddev
->persistent
= 0;
2189 mddev
->major_version
= 0;
2190 mddev
->minor_version
= 90;
2193 major
= simple_strtoul(buf
, &e
, 10);
2194 if (e
==buf
|| *e
!= '.')
2197 minor
= simple_strtoul(buf
, &e
, 10);
2198 if (e
==buf
|| *e
!= '\n')
2200 if (major
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2201 super_types
[major
].name
== NULL
)
2203 mddev
->major_version
= major
;
2204 mddev
->minor_version
= minor
;
2205 mddev
->persistent
= 1;
2209 static struct md_sysfs_entry md_metadata
=
2210 __ATTR(metadata_version
, 0644, metadata_show
, metadata_store
);
2213 action_show(mddev_t
*mddev
, char *page
)
2215 char *type
= "idle";
2216 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2217 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2218 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2220 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2221 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2223 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2230 return sprintf(page
, "%s\n", type
);
2234 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2236 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2239 if (cmd_match(page
, "idle")) {
2240 if (mddev
->sync_thread
) {
2241 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2242 md_unregister_thread(mddev
->sync_thread
);
2243 mddev
->sync_thread
= NULL
;
2244 mddev
->recovery
= 0;
2246 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2247 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2249 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2250 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2251 else if (cmd_match(page
, "reshape")) {
2253 if (mddev
->pers
->start_reshape
== NULL
)
2255 err
= mddev
->pers
->start_reshape(mddev
);
2259 if (cmd_match(page
, "check"))
2260 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2261 else if (cmd_match(page
, "repair"))
2263 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2264 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2266 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2267 md_wakeup_thread(mddev
->thread
);
2272 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2274 return sprintf(page
, "%llu\n",
2275 (unsigned long long) mddev
->resync_mismatches
);
2278 static struct md_sysfs_entry
2279 md_scan_mode
= __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2282 static struct md_sysfs_entry
2283 md_mismatches
= __ATTR_RO(mismatch_cnt
);
2286 sync_min_show(mddev_t
*mddev
, char *page
)
2288 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2289 mddev
->sync_speed_min
? "local": "system");
2293 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2297 if (strncmp(buf
, "system", 6)==0) {
2298 mddev
->sync_speed_min
= 0;
2301 min
= simple_strtoul(buf
, &e
, 10);
2302 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2304 mddev
->sync_speed_min
= min
;
2308 static struct md_sysfs_entry md_sync_min
=
2309 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2312 sync_max_show(mddev_t
*mddev
, char *page
)
2314 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2315 mddev
->sync_speed_max
? "local": "system");
2319 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2323 if (strncmp(buf
, "system", 6)==0) {
2324 mddev
->sync_speed_max
= 0;
2327 max
= simple_strtoul(buf
, &e
, 10);
2328 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2330 mddev
->sync_speed_max
= max
;
2334 static struct md_sysfs_entry md_sync_max
=
2335 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2339 sync_speed_show(mddev_t
*mddev
, char *page
)
2341 unsigned long resync
, dt
, db
;
2342 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2343 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2345 db
= resync
- (mddev
->resync_mark_cnt
);
2346 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2349 static struct md_sysfs_entry
2350 md_sync_speed
= __ATTR_RO(sync_speed
);
2353 sync_completed_show(mddev_t
*mddev
, char *page
)
2355 unsigned long max_blocks
, resync
;
2357 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2358 max_blocks
= mddev
->resync_max_sectors
;
2360 max_blocks
= mddev
->size
<< 1;
2362 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2363 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2366 static struct md_sysfs_entry
2367 md_sync_completed
= __ATTR_RO(sync_completed
);
2370 suspend_lo_show(mddev_t
*mddev
, char *page
)
2372 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
2376 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2379 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2381 if (mddev
->pers
->quiesce
== NULL
)
2383 if (buf
== e
|| (*e
&& *e
!= '\n'))
2385 if (new >= mddev
->suspend_hi
||
2386 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
2387 mddev
->suspend_lo
= new;
2388 mddev
->pers
->quiesce(mddev
, 2);
2393 static struct md_sysfs_entry md_suspend_lo
=
2394 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
2398 suspend_hi_show(mddev_t
*mddev
, char *page
)
2400 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
2404 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2407 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2409 if (mddev
->pers
->quiesce
== NULL
)
2411 if (buf
== e
|| (*e
&& *e
!= '\n'))
2413 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
2414 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
2415 mddev
->suspend_hi
= new;
2416 mddev
->pers
->quiesce(mddev
, 1);
2417 mddev
->pers
->quiesce(mddev
, 0);
2422 static struct md_sysfs_entry md_suspend_hi
=
2423 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
2426 static struct attribute
*md_default_attrs
[] = {
2428 &md_raid_disks
.attr
,
2429 &md_chunk_size
.attr
,
2432 &md_new_device
.attr
,
2436 static struct attribute
*md_redundancy_attrs
[] = {
2438 &md_mismatches
.attr
,
2441 &md_sync_speed
.attr
,
2442 &md_sync_completed
.attr
,
2443 &md_suspend_lo
.attr
,
2444 &md_suspend_hi
.attr
,
2447 static struct attribute_group md_redundancy_group
= {
2449 .attrs
= md_redundancy_attrs
,
2454 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2456 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2457 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2463 rv
= entry
->show(mddev
, page
);
2464 mddev_unlock(mddev
);
2469 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2470 const char *page
, size_t length
)
2472 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2473 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2479 rv
= entry
->store(mddev
, page
, length
);
2480 mddev_unlock(mddev
);
2484 static void md_free(struct kobject
*ko
)
2486 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
2490 static struct sysfs_ops md_sysfs_ops
= {
2491 .show
= md_attr_show
,
2492 .store
= md_attr_store
,
2494 static struct kobj_type md_ktype
= {
2496 .sysfs_ops
= &md_sysfs_ops
,
2497 .default_attrs
= md_default_attrs
,
2502 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
2504 static DEFINE_MUTEX(disks_mutex
);
2505 mddev_t
*mddev
= mddev_find(dev
);
2506 struct gendisk
*disk
;
2507 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
2508 int shift
= partitioned
? MdpMinorShift
: 0;
2509 int unit
= MINOR(dev
) >> shift
;
2514 mutex_lock(&disks_mutex
);
2515 if (mddev
->gendisk
) {
2516 mutex_unlock(&disks_mutex
);
2520 disk
= alloc_disk(1 << shift
);
2522 mutex_unlock(&disks_mutex
);
2526 disk
->major
= MAJOR(dev
);
2527 disk
->first_minor
= unit
<< shift
;
2529 sprintf(disk
->disk_name
, "md_d%d", unit
);
2530 sprintf(disk
->devfs_name
, "md/d%d", unit
);
2532 sprintf(disk
->disk_name
, "md%d", unit
);
2533 sprintf(disk
->devfs_name
, "md/%d", unit
);
2535 disk
->fops
= &md_fops
;
2536 disk
->private_data
= mddev
;
2537 disk
->queue
= mddev
->queue
;
2539 mddev
->gendisk
= disk
;
2540 mutex_unlock(&disks_mutex
);
2541 mddev
->kobj
.parent
= &disk
->kobj
;
2542 mddev
->kobj
.k_name
= NULL
;
2543 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
2544 mddev
->kobj
.ktype
= &md_ktype
;
2545 kobject_register(&mddev
->kobj
);
2549 void md_wakeup_thread(mdk_thread_t
*thread
);
2551 static void md_safemode_timeout(unsigned long data
)
2553 mddev_t
*mddev
= (mddev_t
*) data
;
2555 mddev
->safemode
= 1;
2556 md_wakeup_thread(mddev
->thread
);
2559 static int start_dirty_degraded
;
2561 static int do_md_run(mddev_t
* mddev
)
2565 struct list_head
*tmp
;
2567 struct gendisk
*disk
;
2568 struct mdk_personality
*pers
;
2569 char b
[BDEVNAME_SIZE
];
2571 if (list_empty(&mddev
->disks
))
2572 /* cannot run an array with no devices.. */
2579 * Analyze all RAID superblock(s)
2581 if (!mddev
->raid_disks
)
2584 chunk_size
= mddev
->chunk_size
;
2587 if (chunk_size
> MAX_CHUNK_SIZE
) {
2588 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
2589 chunk_size
, MAX_CHUNK_SIZE
);
2593 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2595 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
2596 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
2599 if (chunk_size
< PAGE_SIZE
) {
2600 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
2601 chunk_size
, PAGE_SIZE
);
2605 /* devices must have minimum size of one chunk */
2606 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2607 if (test_bit(Faulty
, &rdev
->flags
))
2609 if (rdev
->size
< chunk_size
/ 1024) {
2611 "md: Dev %s smaller than chunk_size:"
2613 bdevname(rdev
->bdev
,b
),
2614 (unsigned long long)rdev
->size
,
2622 if (mddev
->level
!= LEVEL_NONE
)
2623 request_module("md-level-%d", mddev
->level
);
2624 else if (mddev
->clevel
[0])
2625 request_module("md-%s", mddev
->clevel
);
2629 * Drop all container device buffers, from now on
2630 * the only valid external interface is through the md
2632 * Also find largest hardsector size
2634 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2635 if (test_bit(Faulty
, &rdev
->flags
))
2637 sync_blockdev(rdev
->bdev
);
2638 invalidate_bdev(rdev
->bdev
, 0);
2641 md_probe(mddev
->unit
, NULL
, NULL
);
2642 disk
= mddev
->gendisk
;
2646 spin_lock(&pers_lock
);
2647 pers
= find_pers(mddev
->level
, mddev
->clevel
);
2648 if (!pers
|| !try_module_get(pers
->owner
)) {
2649 spin_unlock(&pers_lock
);
2650 if (mddev
->level
!= LEVEL_NONE
)
2651 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
2654 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
2659 spin_unlock(&pers_lock
);
2660 mddev
->level
= pers
->level
;
2661 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2663 if (mddev
->reshape_position
!= MaxSector
&&
2664 pers
->start_reshape
== NULL
) {
2665 /* This personality cannot handle reshaping... */
2667 module_put(pers
->owner
);
2671 mddev
->recovery
= 0;
2672 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
2673 mddev
->barriers_work
= 1;
2674 mddev
->ok_start_degraded
= start_dirty_degraded
;
2677 mddev
->ro
= 2; /* read-only, but switch on first write */
2679 err
= mddev
->pers
->run(mddev
);
2680 if (!err
&& mddev
->pers
->sync_request
) {
2681 err
= bitmap_create(mddev
);
2683 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
2684 mdname(mddev
), err
);
2685 mddev
->pers
->stop(mddev
);
2689 printk(KERN_ERR
"md: pers->run() failed ...\n");
2690 module_put(mddev
->pers
->owner
);
2692 bitmap_destroy(mddev
);
2695 if (mddev
->pers
->sync_request
)
2696 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
);
2697 else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
2700 atomic_set(&mddev
->writes_pending
,0);
2701 mddev
->safemode
= 0;
2702 mddev
->safemode_timer
.function
= md_safemode_timeout
;
2703 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
2704 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
2707 ITERATE_RDEV(mddev
,rdev
,tmp
)
2708 if (rdev
->raid_disk
>= 0) {
2710 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2711 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
2714 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2715 md_wakeup_thread(mddev
->thread
);
2717 if (mddev
->sb_dirty
)
2718 md_update_sb(mddev
);
2720 set_capacity(disk
, mddev
->array_size
<<1);
2722 /* If we call blk_queue_make_request here, it will
2723 * re-initialise max_sectors etc which may have been
2724 * refined inside -> run. So just set the bits we need to set.
2725 * Most initialisation happended when we called
2726 * blk_queue_make_request(..., md_fail_request)
2729 mddev
->queue
->queuedata
= mddev
;
2730 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
2733 md_new_event(mddev
);
2737 static int restart_array(mddev_t
*mddev
)
2739 struct gendisk
*disk
= mddev
->gendisk
;
2743 * Complain if it has no devices
2746 if (list_empty(&mddev
->disks
))
2754 mddev
->safemode
= 0;
2756 set_disk_ro(disk
, 0);
2758 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
2761 * Kick recovery or resync if necessary
2763 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2764 md_wakeup_thread(mddev
->thread
);
2767 printk(KERN_ERR
"md: %s has no personality assigned.\n",
2776 static int do_md_stop(mddev_t
* mddev
, int ro
)
2779 struct gendisk
*disk
= mddev
->gendisk
;
2782 if (atomic_read(&mddev
->active
)>2) {
2783 printk("md: %s still in use.\n",mdname(mddev
));
2787 if (mddev
->sync_thread
) {
2788 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2789 md_unregister_thread(mddev
->sync_thread
);
2790 mddev
->sync_thread
= NULL
;
2793 del_timer_sync(&mddev
->safemode_timer
);
2795 invalidate_partition(disk
, 0);
2803 bitmap_flush(mddev
);
2804 md_super_wait(mddev
);
2806 set_disk_ro(disk
, 0);
2807 blk_queue_make_request(mddev
->queue
, md_fail_request
);
2808 mddev
->pers
->stop(mddev
);
2809 if (mddev
->pers
->sync_request
)
2810 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
2812 module_put(mddev
->pers
->owner
);
2817 if (!mddev
->in_sync
) {
2818 /* mark array as shutdown cleanly */
2820 md_update_sb(mddev
);
2823 set_disk_ro(disk
, 1);
2827 * Free resources if final stop
2831 struct list_head
*tmp
;
2832 struct gendisk
*disk
;
2833 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
2835 bitmap_destroy(mddev
);
2836 if (mddev
->bitmap_file
) {
2837 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
2838 fput(mddev
->bitmap_file
);
2839 mddev
->bitmap_file
= NULL
;
2841 mddev
->bitmap_offset
= 0;
2843 ITERATE_RDEV(mddev
,rdev
,tmp
)
2844 if (rdev
->raid_disk
>= 0) {
2846 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2847 sysfs_remove_link(&mddev
->kobj
, nm
);
2850 export_array(mddev
);
2852 mddev
->array_size
= 0;
2853 disk
= mddev
->gendisk
;
2855 set_capacity(disk
, 0);
2858 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
2861 md_new_event(mddev
);
2866 static void autorun_array(mddev_t
*mddev
)
2869 struct list_head
*tmp
;
2872 if (list_empty(&mddev
->disks
))
2875 printk(KERN_INFO
"md: running: ");
2877 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2878 char b
[BDEVNAME_SIZE
];
2879 printk("<%s>", bdevname(rdev
->bdev
,b
));
2883 err
= do_md_run (mddev
);
2885 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
2886 do_md_stop (mddev
, 0);
2891 * lets try to run arrays based on all disks that have arrived
2892 * until now. (those are in pending_raid_disks)
2894 * the method: pick the first pending disk, collect all disks with
2895 * the same UUID, remove all from the pending list and put them into
2896 * the 'same_array' list. Then order this list based on superblock
2897 * update time (freshest comes first), kick out 'old' disks and
2898 * compare superblocks. If everything's fine then run it.
2900 * If "unit" is allocated, then bump its reference count
2902 static void autorun_devices(int part
)
2904 struct list_head
*tmp
;
2905 mdk_rdev_t
*rdev0
, *rdev
;
2907 char b
[BDEVNAME_SIZE
];
2909 printk(KERN_INFO
"md: autorun ...\n");
2910 while (!list_empty(&pending_raid_disks
)) {
2912 LIST_HEAD(candidates
);
2913 rdev0
= list_entry(pending_raid_disks
.next
,
2914 mdk_rdev_t
, same_set
);
2916 printk(KERN_INFO
"md: considering %s ...\n",
2917 bdevname(rdev0
->bdev
,b
));
2918 INIT_LIST_HEAD(&candidates
);
2919 ITERATE_RDEV_PENDING(rdev
,tmp
)
2920 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
2921 printk(KERN_INFO
"md: adding %s ...\n",
2922 bdevname(rdev
->bdev
,b
));
2923 list_move(&rdev
->same_set
, &candidates
);
2926 * now we have a set of devices, with all of them having
2927 * mostly sane superblocks. It's time to allocate the
2930 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
2931 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
2932 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
2936 dev
= MKDEV(mdp_major
,
2937 rdev0
->preferred_minor
<< MdpMinorShift
);
2939 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
2941 md_probe(dev
, NULL
, NULL
);
2942 mddev
= mddev_find(dev
);
2945 "md: cannot allocate memory for md drive.\n");
2948 if (mddev_lock(mddev
))
2949 printk(KERN_WARNING
"md: %s locked, cannot run\n",
2951 else if (mddev
->raid_disks
|| mddev
->major_version
2952 || !list_empty(&mddev
->disks
)) {
2954 "md: %s already running, cannot run %s\n",
2955 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
2956 mddev_unlock(mddev
);
2958 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
2959 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
2960 list_del_init(&rdev
->same_set
);
2961 if (bind_rdev_to_array(rdev
, mddev
))
2964 autorun_array(mddev
);
2965 mddev_unlock(mddev
);
2967 /* on success, candidates will be empty, on error
2970 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
2974 printk(KERN_INFO
"md: ... autorun DONE.\n");
2978 * import RAID devices based on one partition
2979 * if possible, the array gets run as well.
2982 static int autostart_array(dev_t startdev
)
2984 char b
[BDEVNAME_SIZE
];
2985 int err
= -EINVAL
, i
;
2986 mdp_super_t
*sb
= NULL
;
2987 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
2989 start_rdev
= md_import_device(startdev
, 0, 0);
2990 if (IS_ERR(start_rdev
))
2994 /* NOTE: this can only work for 0.90.0 superblocks */
2995 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
2996 if (sb
->major_version
!= 0 ||
2997 sb
->minor_version
!= 90 ) {
2998 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
2999 export_rdev(start_rdev
);
3003 if (test_bit(Faulty
, &start_rdev
->flags
)) {
3005 "md: can not autostart based on faulty %s!\n",
3006 bdevname(start_rdev
->bdev
,b
));
3007 export_rdev(start_rdev
);
3010 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
3012 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
3013 mdp_disk_t
*desc
= sb
->disks
+ i
;
3014 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
3018 if (dev
== startdev
)
3020 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
3022 rdev
= md_import_device(dev
, 0, 0);
3026 list_add(&rdev
->same_set
, &pending_raid_disks
);
3030 * possibly return codes
3038 static int get_version(void __user
* arg
)
3042 ver
.major
= MD_MAJOR_VERSION
;
3043 ver
.minor
= MD_MINOR_VERSION
;
3044 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3046 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3052 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3054 mdu_array_info_t info
;
3055 int nr
,working
,active
,failed
,spare
;
3057 struct list_head
*tmp
;
3059 nr
=working
=active
=failed
=spare
=0;
3060 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3062 if (test_bit(Faulty
, &rdev
->flags
))
3066 if (test_bit(In_sync
, &rdev
->flags
))
3073 info
.major_version
= mddev
->major_version
;
3074 info
.minor_version
= mddev
->minor_version
;
3075 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3076 info
.ctime
= mddev
->ctime
;
3077 info
.level
= mddev
->level
;
3078 info
.size
= mddev
->size
;
3079 if (info
.size
!= mddev
->size
) /* overflow */
3082 info
.raid_disks
= mddev
->raid_disks
;
3083 info
.md_minor
= mddev
->md_minor
;
3084 info
.not_persistent
= !mddev
->persistent
;
3086 info
.utime
= mddev
->utime
;
3089 info
.state
= (1<<MD_SB_CLEAN
);
3090 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3091 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3092 info
.active_disks
= active
;
3093 info
.working_disks
= working
;
3094 info
.failed_disks
= failed
;
3095 info
.spare_disks
= spare
;
3097 info
.layout
= mddev
->layout
;
3098 info
.chunk_size
= mddev
->chunk_size
;
3100 if (copy_to_user(arg
, &info
, sizeof(info
)))
3106 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3108 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3109 char *ptr
, *buf
= NULL
;
3112 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3116 /* bitmap disabled, zero the first byte and copy out */
3117 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3118 file
->pathname
[0] = '\0';
3122 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3126 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3130 strcpy(file
->pathname
, ptr
);
3134 if (copy_to_user(arg
, file
, sizeof(*file
)))
3142 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3144 mdu_disk_info_t info
;
3148 if (copy_from_user(&info
, arg
, sizeof(info
)))
3153 rdev
= find_rdev_nr(mddev
, nr
);
3155 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3156 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3157 info
.raid_disk
= rdev
->raid_disk
;
3159 if (test_bit(Faulty
, &rdev
->flags
))
3160 info
.state
|= (1<<MD_DISK_FAULTY
);
3161 else if (test_bit(In_sync
, &rdev
->flags
)) {
3162 info
.state
|= (1<<MD_DISK_ACTIVE
);
3163 info
.state
|= (1<<MD_DISK_SYNC
);
3165 if (test_bit(WriteMostly
, &rdev
->flags
))
3166 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3168 info
.major
= info
.minor
= 0;
3169 info
.raid_disk
= -1;
3170 info
.state
= (1<<MD_DISK_REMOVED
);
3173 if (copy_to_user(arg
, &info
, sizeof(info
)))
3179 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3181 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3183 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3185 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3188 if (!mddev
->raid_disks
) {
3190 /* expecting a device which has a superblock */
3191 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3194 "md: md_import_device returned %ld\n",
3196 return PTR_ERR(rdev
);
3198 if (!list_empty(&mddev
->disks
)) {
3199 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3200 mdk_rdev_t
, same_set
);
3201 int err
= super_types
[mddev
->major_version
]
3202 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3205 "md: %s has different UUID to %s\n",
3206 bdevname(rdev
->bdev
,b
),
3207 bdevname(rdev0
->bdev
,b2
));
3212 err
= bind_rdev_to_array(rdev
, mddev
);
3219 * add_new_disk can be used once the array is assembled
3220 * to add "hot spares". They must already have a superblock
3225 if (!mddev
->pers
->hot_add_disk
) {
3227 "%s: personality does not support diskops!\n",
3231 if (mddev
->persistent
)
3232 rdev
= md_import_device(dev
, mddev
->major_version
,
3233 mddev
->minor_version
);
3235 rdev
= md_import_device(dev
, -1, -1);
3238 "md: md_import_device returned %ld\n",
3240 return PTR_ERR(rdev
);
3242 /* set save_raid_disk if appropriate */
3243 if (!mddev
->persistent
) {
3244 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3245 info
->raid_disk
< mddev
->raid_disks
)
3246 rdev
->raid_disk
= info
->raid_disk
;
3248 rdev
->raid_disk
= -1;
3250 super_types
[mddev
->major_version
].
3251 validate_super(mddev
, rdev
);
3252 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3254 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3255 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3256 set_bit(WriteMostly
, &rdev
->flags
);
3258 rdev
->raid_disk
= -1;
3259 err
= bind_rdev_to_array(rdev
, mddev
);
3263 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3264 md_wakeup_thread(mddev
->thread
);
3268 /* otherwise, add_new_disk is only allowed
3269 * for major_version==0 superblocks
3271 if (mddev
->major_version
!= 0) {
3272 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3277 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3279 rdev
= md_import_device (dev
, -1, 0);
3282 "md: error, md_import_device() returned %ld\n",
3284 return PTR_ERR(rdev
);
3286 rdev
->desc_nr
= info
->number
;
3287 if (info
->raid_disk
< mddev
->raid_disks
)
3288 rdev
->raid_disk
= info
->raid_disk
;
3290 rdev
->raid_disk
= -1;
3294 if (rdev
->raid_disk
< mddev
->raid_disks
)
3295 if (info
->state
& (1<<MD_DISK_SYNC
))
3296 set_bit(In_sync
, &rdev
->flags
);
3298 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3299 set_bit(WriteMostly
, &rdev
->flags
);
3301 if (!mddev
->persistent
) {
3302 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3303 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3305 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3306 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3308 err
= bind_rdev_to_array(rdev
, mddev
);
3318 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3320 char b
[BDEVNAME_SIZE
];
3326 rdev
= find_rdev(mddev
, dev
);
3330 if (rdev
->raid_disk
>= 0)
3333 kick_rdev_from_array(rdev
);
3334 md_update_sb(mddev
);
3335 md_new_event(mddev
);
3339 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3340 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3344 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3346 char b
[BDEVNAME_SIZE
];
3354 if (mddev
->major_version
!= 0) {
3355 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3356 " version-0 superblocks.\n",
3360 if (!mddev
->pers
->hot_add_disk
) {
3362 "%s: personality does not support diskops!\n",
3367 rdev
= md_import_device (dev
, -1, 0);
3370 "md: error, md_import_device() returned %ld\n",
3375 if (mddev
->persistent
)
3376 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3379 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3381 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3384 if (test_bit(Faulty
, &rdev
->flags
)) {
3386 "md: can not hot-add faulty %s disk to %s!\n",
3387 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3391 clear_bit(In_sync
, &rdev
->flags
);
3393 err
= bind_rdev_to_array(rdev
, mddev
);
3398 * The rest should better be atomic, we can have disk failures
3399 * noticed in interrupt contexts ...
3402 if (rdev
->desc_nr
== mddev
->max_disks
) {
3403 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
3406 goto abort_unbind_export
;
3409 rdev
->raid_disk
= -1;
3411 md_update_sb(mddev
);
3414 * Kick recovery, maybe this spare has to be added to the
3415 * array immediately.
3417 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3418 md_wakeup_thread(mddev
->thread
);
3419 md_new_event(mddev
);
3422 abort_unbind_export
:
3423 unbind_rdev_from_array(rdev
);
3430 /* similar to deny_write_access, but accounts for our holding a reference
3431 * to the file ourselves */
3432 static int deny_bitmap_write_access(struct file
* file
)
3434 struct inode
*inode
= file
->f_mapping
->host
;
3436 spin_lock(&inode
->i_lock
);
3437 if (atomic_read(&inode
->i_writecount
) > 1) {
3438 spin_unlock(&inode
->i_lock
);
3441 atomic_set(&inode
->i_writecount
, -1);
3442 spin_unlock(&inode
->i_lock
);
3447 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
3452 if (!mddev
->pers
->quiesce
)
3454 if (mddev
->recovery
|| mddev
->sync_thread
)
3456 /* we should be able to change the bitmap.. */
3462 return -EEXIST
; /* cannot add when bitmap is present */
3463 mddev
->bitmap_file
= fget(fd
);
3465 if (mddev
->bitmap_file
== NULL
) {
3466 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
3471 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
3473 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
3475 fput(mddev
->bitmap_file
);
3476 mddev
->bitmap_file
= NULL
;
3479 mddev
->bitmap_offset
= 0; /* file overrides offset */
3480 } else if (mddev
->bitmap
== NULL
)
3481 return -ENOENT
; /* cannot remove what isn't there */
3484 mddev
->pers
->quiesce(mddev
, 1);
3486 err
= bitmap_create(mddev
);
3488 bitmap_destroy(mddev
);
3489 mddev
->pers
->quiesce(mddev
, 0);
3490 } else if (fd
< 0) {
3491 if (mddev
->bitmap_file
)
3492 fput(mddev
->bitmap_file
);
3493 mddev
->bitmap_file
= NULL
;
3500 * set_array_info is used two different ways
3501 * The original usage is when creating a new array.
3502 * In this usage, raid_disks is > 0 and it together with
3503 * level, size, not_persistent,layout,chunksize determine the
3504 * shape of the array.
3505 * This will always create an array with a type-0.90.0 superblock.
3506 * The newer usage is when assembling an array.
3507 * In this case raid_disks will be 0, and the major_version field is
3508 * use to determine which style super-blocks are to be found on the devices.
3509 * The minor and patch _version numbers are also kept incase the
3510 * super_block handler wishes to interpret them.
3512 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
3515 if (info
->raid_disks
== 0) {
3516 /* just setting version number for superblock loading */
3517 if (info
->major_version
< 0 ||
3518 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
3519 super_types
[info
->major_version
].name
== NULL
) {
3520 /* maybe try to auto-load a module? */
3522 "md: superblock version %d not known\n",
3523 info
->major_version
);
3526 mddev
->major_version
= info
->major_version
;
3527 mddev
->minor_version
= info
->minor_version
;
3528 mddev
->patch_version
= info
->patch_version
;
3531 mddev
->major_version
= MD_MAJOR_VERSION
;
3532 mddev
->minor_version
= MD_MINOR_VERSION
;
3533 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
3534 mddev
->ctime
= get_seconds();
3536 mddev
->level
= info
->level
;
3537 mddev
->clevel
[0] = 0;
3538 mddev
->size
= info
->size
;
3539 mddev
->raid_disks
= info
->raid_disks
;
3540 /* don't set md_minor, it is determined by which /dev/md* was
3543 if (info
->state
& (1<<MD_SB_CLEAN
))
3544 mddev
->recovery_cp
= MaxSector
;
3546 mddev
->recovery_cp
= 0;
3547 mddev
->persistent
= ! info
->not_persistent
;
3549 mddev
->layout
= info
->layout
;
3550 mddev
->chunk_size
= info
->chunk_size
;
3552 mddev
->max_disks
= MD_SB_DISKS
;
3554 mddev
->sb_dirty
= 1;
3556 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
3557 mddev
->bitmap_offset
= 0;
3559 mddev
->reshape_position
= MaxSector
;
3562 * Generate a 128 bit UUID
3564 get_random_bytes(mddev
->uuid
, 16);
3566 mddev
->new_level
= mddev
->level
;
3567 mddev
->new_chunk
= mddev
->chunk_size
;
3568 mddev
->new_layout
= mddev
->layout
;
3569 mddev
->delta_disks
= 0;
3574 static int update_size(mddev_t
*mddev
, unsigned long size
)
3578 struct list_head
*tmp
;
3579 int fit
= (size
== 0);
3581 if (mddev
->pers
->resize
== NULL
)
3583 /* The "size" is the amount of each device that is used.
3584 * This can only make sense for arrays with redundancy.
3585 * linear and raid0 always use whatever space is available
3586 * We can only consider changing the size if no resync
3587 * or reconstruction is happening, and if the new size
3588 * is acceptable. It must fit before the sb_offset or,
3589 * if that is <data_offset, it must fit before the
3590 * size of each device.
3591 * If size is zero, we find the largest size that fits.
3593 if (mddev
->sync_thread
)
3595 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3597 if (rdev
->sb_offset
> rdev
->data_offset
)
3598 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
3600 avail
= get_capacity(rdev
->bdev
->bd_disk
)
3601 - rdev
->data_offset
;
3602 if (fit
&& (size
== 0 || size
> avail
/2))
3604 if (avail
< ((sector_t
)size
<< 1))
3607 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
3609 struct block_device
*bdev
;
3611 bdev
= bdget_disk(mddev
->gendisk
, 0);
3613 mutex_lock(&bdev
->bd_inode
->i_mutex
);
3614 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
3615 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
3622 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
3625 /* change the number of raid disks */
3626 if (mddev
->pers
->check_reshape
== NULL
)
3628 if (raid_disks
<= 0 ||
3629 raid_disks
>= mddev
->max_disks
)
3631 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
3633 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
3635 rv
= mddev
->pers
->check_reshape(mddev
);
3641 * update_array_info is used to change the configuration of an
3643 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3644 * fields in the info are checked against the array.
3645 * Any differences that cannot be handled will cause an error.
3646 * Normally, only one change can be managed at a time.
3648 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
3654 /* calculate expected state,ignoring low bits */
3655 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3656 state
|= (1 << MD_SB_BITMAP_PRESENT
);
3658 if (mddev
->major_version
!= info
->major_version
||
3659 mddev
->minor_version
!= info
->minor_version
||
3660 /* mddev->patch_version != info->patch_version || */
3661 mddev
->ctime
!= info
->ctime
||
3662 mddev
->level
!= info
->level
||
3663 /* mddev->layout != info->layout || */
3664 !mddev
->persistent
!= info
->not_persistent
||
3665 mddev
->chunk_size
!= info
->chunk_size
||
3666 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3667 ((state
^info
->state
) & 0xfffffe00)
3670 /* Check there is only one change */
3671 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
3672 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
3673 if (mddev
->layout
!= info
->layout
) cnt
++;
3674 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
3675 if (cnt
== 0) return 0;
3676 if (cnt
> 1) return -EINVAL
;
3678 if (mddev
->layout
!= info
->layout
) {
3680 * we don't need to do anything at the md level, the
3681 * personality will take care of it all.
3683 if (mddev
->pers
->reconfig
== NULL
)
3686 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
3688 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
3689 rv
= update_size(mddev
, info
->size
);
3691 if (mddev
->raid_disks
!= info
->raid_disks
)
3692 rv
= update_raid_disks(mddev
, info
->raid_disks
);
3694 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
3695 if (mddev
->pers
->quiesce
== NULL
)
3697 if (mddev
->recovery
|| mddev
->sync_thread
)
3699 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
3700 /* add the bitmap */
3703 if (mddev
->default_bitmap_offset
== 0)
3705 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
3706 mddev
->pers
->quiesce(mddev
, 1);
3707 rv
= bitmap_create(mddev
);
3709 bitmap_destroy(mddev
);
3710 mddev
->pers
->quiesce(mddev
, 0);
3712 /* remove the bitmap */
3715 if (mddev
->bitmap
->file
)
3717 mddev
->pers
->quiesce(mddev
, 1);
3718 bitmap_destroy(mddev
);
3719 mddev
->pers
->quiesce(mddev
, 0);
3720 mddev
->bitmap_offset
= 0;
3723 md_update_sb(mddev
);
3727 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
3731 if (mddev
->pers
== NULL
)
3734 rdev
= find_rdev(mddev
, dev
);
3738 md_error(mddev
, rdev
);
3742 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3744 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
3748 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
3752 static int md_ioctl(struct inode
*inode
, struct file
*file
,
3753 unsigned int cmd
, unsigned long arg
)
3756 void __user
*argp
= (void __user
*)arg
;
3757 mddev_t
*mddev
= NULL
;
3759 if (!capable(CAP_SYS_ADMIN
))
3763 * Commands dealing with the RAID driver but not any
3769 err
= get_version(argp
);
3772 case PRINT_RAID_DEBUG
:
3780 autostart_arrays(arg
);
3787 * Commands creating/starting a new array:
3790 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3798 if (cmd
== START_ARRAY
) {
3799 /* START_ARRAY doesn't need to lock the array as autostart_array
3800 * does the locking, and it could even be a different array
3805 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3806 "This will not be supported beyond July 2006\n",
3807 current
->comm
, current
->pid
);
3810 err
= autostart_array(new_decode_dev(arg
));
3812 printk(KERN_WARNING
"md: autostart failed!\n");
3818 err
= mddev_lock(mddev
);
3821 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3828 case SET_ARRAY_INFO
:
3830 mdu_array_info_t info
;
3832 memset(&info
, 0, sizeof(info
));
3833 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
3838 err
= update_array_info(mddev
, &info
);
3840 printk(KERN_WARNING
"md: couldn't update"
3841 " array info. %d\n", err
);
3846 if (!list_empty(&mddev
->disks
)) {
3848 "md: array %s already has disks!\n",
3853 if (mddev
->raid_disks
) {
3855 "md: array %s already initialised!\n",
3860 err
= set_array_info(mddev
, &info
);
3862 printk(KERN_WARNING
"md: couldn't set"
3863 " array info. %d\n", err
);
3873 * Commands querying/configuring an existing array:
3875 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3876 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3877 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
3878 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
3884 * Commands even a read-only array can execute:
3888 case GET_ARRAY_INFO
:
3889 err
= get_array_info(mddev
, argp
);
3892 case GET_BITMAP_FILE
:
3893 err
= get_bitmap_file(mddev
, argp
);
3897 err
= get_disk_info(mddev
, argp
);
3900 case RESTART_ARRAY_RW
:
3901 err
= restart_array(mddev
);
3905 err
= do_md_stop (mddev
, 0);
3909 err
= do_md_stop (mddev
, 1);
3913 * We have a problem here : there is no easy way to give a CHS
3914 * virtual geometry. We currently pretend that we have a 2 heads
3915 * 4 sectors (with a BIG number of cylinders...). This drives
3916 * dosfs just mad... ;-)
3921 * The remaining ioctls are changing the state of the
3922 * superblock, so we do not allow them on read-only arrays.
3923 * However non-MD ioctls (e.g. get-size) will still come through
3924 * here and hit the 'default' below, so only disallow
3925 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3927 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
3928 mddev
->ro
&& mddev
->pers
) {
3929 if (mddev
->ro
== 2) {
3931 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3932 md_wakeup_thread(mddev
->thread
);
3944 mdu_disk_info_t info
;
3945 if (copy_from_user(&info
, argp
, sizeof(info
)))
3948 err
= add_new_disk(mddev
, &info
);
3952 case HOT_REMOVE_DISK
:
3953 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
3957 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
3960 case SET_DISK_FAULTY
:
3961 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
3965 err
= do_md_run (mddev
);
3968 case SET_BITMAP_FILE
:
3969 err
= set_bitmap_file(mddev
, (int)arg
);
3973 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
3974 printk(KERN_WARNING
"md: %s(pid %d) used"
3975 " obsolete MD ioctl, upgrade your"
3976 " software to use new ictls.\n",
3977 current
->comm
, current
->pid
);
3984 mddev_unlock(mddev
);
3994 static int md_open(struct inode
*inode
, struct file
*file
)
3997 * Succeed if we can lock the mddev, which confirms that
3998 * it isn't being stopped right now.
4000 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4003 if ((err
= mddev_lock(mddev
)))
4008 mddev_unlock(mddev
);
4010 check_disk_change(inode
->i_bdev
);
4015 static int md_release(struct inode
*inode
, struct file
* file
)
4017 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4026 static int md_media_changed(struct gendisk
*disk
)
4028 mddev_t
*mddev
= disk
->private_data
;
4030 return mddev
->changed
;
4033 static int md_revalidate(struct gendisk
*disk
)
4035 mddev_t
*mddev
= disk
->private_data
;
4040 static struct block_device_operations md_fops
=
4042 .owner
= THIS_MODULE
,
4044 .release
= md_release
,
4046 .getgeo
= md_getgeo
,
4047 .media_changed
= md_media_changed
,
4048 .revalidate_disk
= md_revalidate
,
4051 static int md_thread(void * arg
)
4053 mdk_thread_t
*thread
= arg
;
4056 * md_thread is a 'system-thread', it's priority should be very
4057 * high. We avoid resource deadlocks individually in each
4058 * raid personality. (RAID5 does preallocation) We also use RR and
4059 * the very same RT priority as kswapd, thus we will never get
4060 * into a priority inversion deadlock.
4062 * we definitely have to have equal or higher priority than
4063 * bdflush, otherwise bdflush will deadlock if there are too
4064 * many dirty RAID5 blocks.
4067 allow_signal(SIGKILL
);
4068 while (!kthread_should_stop()) {
4070 /* We need to wait INTERRUPTIBLE so that
4071 * we don't add to the load-average.
4072 * That means we need to be sure no signals are
4075 if (signal_pending(current
))
4076 flush_signals(current
);
4078 wait_event_interruptible_timeout
4080 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4081 || kthread_should_stop(),
4085 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4087 thread
->run(thread
->mddev
);
4093 void md_wakeup_thread(mdk_thread_t
*thread
)
4096 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4097 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4098 wake_up(&thread
->wqueue
);
4102 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4105 mdk_thread_t
*thread
;
4107 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4111 init_waitqueue_head(&thread
->wqueue
);
4114 thread
->mddev
= mddev
;
4115 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4116 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4117 if (IS_ERR(thread
->tsk
)) {
4124 void md_unregister_thread(mdk_thread_t
*thread
)
4126 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
4128 kthread_stop(thread
->tsk
);
4132 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4139 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4142 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4144 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4145 __builtin_return_address(0),__builtin_return_address(1),
4146 __builtin_return_address(2),__builtin_return_address(3));
4148 if (!mddev
->pers
->error_handler
)
4150 mddev
->pers
->error_handler(mddev
,rdev
);
4151 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4152 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4153 md_wakeup_thread(mddev
->thread
);
4154 md_new_event(mddev
);
4157 /* seq_file implementation /proc/mdstat */
4159 static void status_unused(struct seq_file
*seq
)
4163 struct list_head
*tmp
;
4165 seq_printf(seq
, "unused devices: ");
4167 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4168 char b
[BDEVNAME_SIZE
];
4170 seq_printf(seq
, "%s ",
4171 bdevname(rdev
->bdev
,b
));
4174 seq_printf(seq
, "<none>");
4176 seq_printf(seq
, "\n");
4180 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4182 sector_t max_blocks
, resync
, res
;
4183 unsigned long dt
, db
, rt
;
4185 unsigned int per_milli
;
4187 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4189 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4190 max_blocks
= mddev
->resync_max_sectors
>> 1;
4192 max_blocks
= mddev
->size
;
4195 * Should not happen.
4201 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4202 * in a sector_t, and (max_blocks>>scale) will fit in a
4203 * u32, as those are the requirements for sector_div.
4204 * Thus 'scale' must be at least 10
4207 if (sizeof(sector_t
) > sizeof(unsigned long)) {
4208 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
4211 res
= (resync
>>scale
)*1000;
4212 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
4216 int i
, x
= per_milli
/50, y
= 20-x
;
4217 seq_printf(seq
, "[");
4218 for (i
= 0; i
< x
; i
++)
4219 seq_printf(seq
, "=");
4220 seq_printf(seq
, ">");
4221 for (i
= 0; i
< y
; i
++)
4222 seq_printf(seq
, ".");
4223 seq_printf(seq
, "] ");
4225 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
4226 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
4228 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4229 "resync" : "recovery")),
4230 per_milli
/10, per_milli
% 10,
4231 (unsigned long long) resync
,
4232 (unsigned long long) max_blocks
);
4235 * We do not want to overflow, so the order of operands and
4236 * the * 100 / 100 trick are important. We do a +1 to be
4237 * safe against division by zero. We only estimate anyway.
4239 * dt: time from mark until now
4240 * db: blocks written from mark until now
4241 * rt: remaining time
4243 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4245 db
= resync
- (mddev
->resync_mark_cnt
/2);
4246 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/100+1)))/100;
4248 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4250 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
4253 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4255 struct list_head
*tmp
;
4265 spin_lock(&all_mddevs_lock
);
4266 list_for_each(tmp
,&all_mddevs
)
4268 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4270 spin_unlock(&all_mddevs_lock
);
4273 spin_unlock(&all_mddevs_lock
);
4275 return (void*)2;/* tail */
4279 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4281 struct list_head
*tmp
;
4282 mddev_t
*next_mddev
, *mddev
= v
;
4288 spin_lock(&all_mddevs_lock
);
4290 tmp
= all_mddevs
.next
;
4292 tmp
= mddev
->all_mddevs
.next
;
4293 if (tmp
!= &all_mddevs
)
4294 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4296 next_mddev
= (void*)2;
4299 spin_unlock(&all_mddevs_lock
);
4307 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4311 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4315 struct mdstat_info
{
4319 static int md_seq_show(struct seq_file
*seq
, void *v
)
4323 struct list_head
*tmp2
;
4325 struct mdstat_info
*mi
= seq
->private;
4326 struct bitmap
*bitmap
;
4328 if (v
== (void*)1) {
4329 struct mdk_personality
*pers
;
4330 seq_printf(seq
, "Personalities : ");
4331 spin_lock(&pers_lock
);
4332 list_for_each_entry(pers
, &pers_list
, list
)
4333 seq_printf(seq
, "[%s] ", pers
->name
);
4335 spin_unlock(&pers_lock
);
4336 seq_printf(seq
, "\n");
4337 mi
->event
= atomic_read(&md_event_count
);
4340 if (v
== (void*)2) {
4345 if (mddev_lock(mddev
)!=0)
4347 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4348 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4349 mddev
->pers
? "" : "in");
4352 seq_printf(seq
, " (read-only)");
4354 seq_printf(seq
, "(auto-read-only)");
4355 seq_printf(seq
, " %s", mddev
->pers
->name
);
4359 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4360 char b
[BDEVNAME_SIZE
];
4361 seq_printf(seq
, " %s[%d]",
4362 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4363 if (test_bit(WriteMostly
, &rdev
->flags
))
4364 seq_printf(seq
, "(W)");
4365 if (test_bit(Faulty
, &rdev
->flags
)) {
4366 seq_printf(seq
, "(F)");
4368 } else if (rdev
->raid_disk
< 0)
4369 seq_printf(seq
, "(S)"); /* spare */
4373 if (!list_empty(&mddev
->disks
)) {
4375 seq_printf(seq
, "\n %llu blocks",
4376 (unsigned long long)mddev
->array_size
);
4378 seq_printf(seq
, "\n %llu blocks",
4379 (unsigned long long)size
);
4381 if (mddev
->persistent
) {
4382 if (mddev
->major_version
!= 0 ||
4383 mddev
->minor_version
!= 90) {
4384 seq_printf(seq
," super %d.%d",
4385 mddev
->major_version
,
4386 mddev
->minor_version
);
4389 seq_printf(seq
, " super non-persistent");
4392 mddev
->pers
->status (seq
, mddev
);
4393 seq_printf(seq
, "\n ");
4394 if (mddev
->pers
->sync_request
) {
4395 if (mddev
->curr_resync
> 2) {
4396 status_resync (seq
, mddev
);
4397 seq_printf(seq
, "\n ");
4398 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4399 seq_printf(seq
, "\tresync=DELAYED\n ");
4400 else if (mddev
->recovery_cp
< MaxSector
)
4401 seq_printf(seq
, "\tresync=PENDING\n ");
4404 seq_printf(seq
, "\n ");
4406 if ((bitmap
= mddev
->bitmap
)) {
4407 unsigned long chunk_kb
;
4408 unsigned long flags
;
4409 spin_lock_irqsave(&bitmap
->lock
, flags
);
4410 chunk_kb
= bitmap
->chunksize
>> 10;
4411 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4413 bitmap
->pages
- bitmap
->missing_pages
,
4415 (bitmap
->pages
- bitmap
->missing_pages
)
4416 << (PAGE_SHIFT
- 10),
4417 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
4418 chunk_kb
? "KB" : "B");
4420 seq_printf(seq
, ", file: ");
4421 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
4422 bitmap
->file
->f_dentry
," \t\n");
4425 seq_printf(seq
, "\n");
4426 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
4429 seq_printf(seq
, "\n");
4431 mddev_unlock(mddev
);
4436 static struct seq_operations md_seq_ops
= {
4437 .start
= md_seq_start
,
4438 .next
= md_seq_next
,
4439 .stop
= md_seq_stop
,
4440 .show
= md_seq_show
,
4443 static int md_seq_open(struct inode
*inode
, struct file
*file
)
4446 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
4450 error
= seq_open(file
, &md_seq_ops
);
4454 struct seq_file
*p
= file
->private_data
;
4456 mi
->event
= atomic_read(&md_event_count
);
4461 static int md_seq_release(struct inode
*inode
, struct file
*file
)
4463 struct seq_file
*m
= file
->private_data
;
4464 struct mdstat_info
*mi
= m
->private;
4467 return seq_release(inode
, file
);
4470 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
4472 struct seq_file
*m
= filp
->private_data
;
4473 struct mdstat_info
*mi
= m
->private;
4476 poll_wait(filp
, &md_event_waiters
, wait
);
4478 /* always allow read */
4479 mask
= POLLIN
| POLLRDNORM
;
4481 if (mi
->event
!= atomic_read(&md_event_count
))
4482 mask
|= POLLERR
| POLLPRI
;
4486 static struct file_operations md_seq_fops
= {
4487 .open
= md_seq_open
,
4489 .llseek
= seq_lseek
,
4490 .release
= md_seq_release
,
4491 .poll
= mdstat_poll
,
4494 int register_md_personality(struct mdk_personality
*p
)
4496 spin_lock(&pers_lock
);
4497 list_add_tail(&p
->list
, &pers_list
);
4498 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
4499 spin_unlock(&pers_lock
);
4503 int unregister_md_personality(struct mdk_personality
*p
)
4505 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
4506 spin_lock(&pers_lock
);
4507 list_del_init(&p
->list
);
4508 spin_unlock(&pers_lock
);
4512 static int is_mddev_idle(mddev_t
*mddev
)
4515 struct list_head
*tmp
;
4517 unsigned long curr_events
;
4520 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4521 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
4522 curr_events
= disk_stat_read(disk
, sectors
[0]) +
4523 disk_stat_read(disk
, sectors
[1]) -
4524 atomic_read(&disk
->sync_io
);
4525 /* The difference between curr_events and last_events
4526 * will be affected by any new non-sync IO (making
4527 * curr_events bigger) and any difference in the amount of
4528 * in-flight syncio (making current_events bigger or smaller)
4529 * The amount in-flight is currently limited to
4530 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4531 * which is at most 4096 sectors.
4532 * These numbers are fairly fragile and should be made
4533 * more robust, probably by enforcing the
4534 * 'window size' that md_do_sync sort-of uses.
4536 * Note: the following is an unsigned comparison.
4538 if ((curr_events
- rdev
->last_events
+ 4096) > 8192) {
4539 rdev
->last_events
= curr_events
;
4546 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
4548 /* another "blocks" (512byte) blocks have been synced */
4549 atomic_sub(blocks
, &mddev
->recovery_active
);
4550 wake_up(&mddev
->recovery_wait
);
4552 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4553 md_wakeup_thread(mddev
->thread
);
4554 // stop recovery, signal do_sync ....
4559 /* md_write_start(mddev, bi)
4560 * If we need to update some array metadata (e.g. 'active' flag
4561 * in superblock) before writing, schedule a superblock update
4562 * and wait for it to complete.
4564 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
4566 if (bio_data_dir(bi
) != WRITE
)
4569 BUG_ON(mddev
->ro
== 1);
4570 if (mddev
->ro
== 2) {
4571 /* need to switch to read/write */
4573 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4574 md_wakeup_thread(mddev
->thread
);
4576 atomic_inc(&mddev
->writes_pending
);
4577 if (mddev
->in_sync
) {
4578 spin_lock_irq(&mddev
->write_lock
);
4579 if (mddev
->in_sync
) {
4581 mddev
->sb_dirty
= 1;
4582 md_wakeup_thread(mddev
->thread
);
4584 spin_unlock_irq(&mddev
->write_lock
);
4586 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
4589 void md_write_end(mddev_t
*mddev
)
4591 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
4592 if (mddev
->safemode
== 2)
4593 md_wakeup_thread(mddev
->thread
);
4595 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
4599 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
4601 #define SYNC_MARKS 10
4602 #define SYNC_MARK_STEP (3*HZ)
4603 void md_do_sync(mddev_t
*mddev
)
4606 unsigned int currspeed
= 0,
4608 sector_t max_sectors
,j
, io_sectors
;
4609 unsigned long mark
[SYNC_MARKS
];
4610 sector_t mark_cnt
[SYNC_MARKS
];
4612 struct list_head
*tmp
;
4613 sector_t last_check
;
4616 /* just incase thread restarts... */
4617 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
4620 /* we overload curr_resync somewhat here.
4621 * 0 == not engaged in resync at all
4622 * 2 == checking that there is no conflict with another sync
4623 * 1 == like 2, but have yielded to allow conflicting resync to
4625 * other == active in resync - this many blocks
4627 * Before starting a resync we must have set curr_resync to
4628 * 2, and then checked that every "conflicting" array has curr_resync
4629 * less than ours. When we find one that is the same or higher
4630 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4631 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4632 * This will mean we have to start checking from the beginning again.
4637 mddev
->curr_resync
= 2;
4640 if (kthread_should_stop()) {
4641 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4644 ITERATE_MDDEV(mddev2
,tmp
) {
4645 if (mddev2
== mddev
)
4647 if (mddev2
->curr_resync
&&
4648 match_mddev_units(mddev
,mddev2
)) {
4650 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
4651 /* arbitrarily yield */
4652 mddev
->curr_resync
= 1;
4653 wake_up(&resync_wait
);
4655 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
4656 /* no need to wait here, we can wait the next
4657 * time 'round when curr_resync == 2
4660 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
4661 if (!kthread_should_stop() &&
4662 mddev2
->curr_resync
>= mddev
->curr_resync
) {
4663 printk(KERN_INFO
"md: delaying resync of %s"
4664 " until %s has finished resync (they"
4665 " share one or more physical units)\n",
4666 mdname(mddev
), mdname(mddev2
));
4669 finish_wait(&resync_wait
, &wq
);
4672 finish_wait(&resync_wait
, &wq
);
4675 } while (mddev
->curr_resync
< 2);
4677 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4678 /* resync follows the size requested by the personality,
4679 * which defaults to physical size, but can be virtual size
4681 max_sectors
= mddev
->resync_max_sectors
;
4682 mddev
->resync_mismatches
= 0;
4683 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4684 max_sectors
= mddev
->size
<< 1;
4686 /* recovery follows the physical size of devices */
4687 max_sectors
= mddev
->size
<< 1;
4689 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
4690 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
4691 " %d KB/sec/disc.\n", speed_min(mddev
));
4692 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
4693 "(but not more than %d KB/sec) for reconstruction.\n",
4696 is_mddev_idle(mddev
); /* this also initializes IO event counters */
4697 /* we don't use the checkpoint if there's a bitmap */
4698 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
4699 && ! test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4700 j
= mddev
->recovery_cp
;
4704 for (m
= 0; m
< SYNC_MARKS
; m
++) {
4706 mark_cnt
[m
] = io_sectors
;
4709 mddev
->resync_mark
= mark
[last_mark
];
4710 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
4713 * Tune reconstruction:
4715 window
= 32*(PAGE_SIZE
/512);
4716 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
4717 window
/2,(unsigned long long) max_sectors
/2);
4719 atomic_set(&mddev
->recovery_active
, 0);
4720 init_waitqueue_head(&mddev
->recovery_wait
);
4725 "md: resuming recovery of %s from checkpoint.\n",
4727 mddev
->curr_resync
= j
;
4730 while (j
< max_sectors
) {
4734 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
4735 currspeed
< speed_min(mddev
));
4737 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4741 if (!skipped
) { /* actual IO requested */
4742 io_sectors
+= sectors
;
4743 atomic_add(sectors
, &mddev
->recovery_active
);
4747 if (j
>1) mddev
->curr_resync
= j
;
4748 if (last_check
== 0)
4749 /* this is the earliers that rebuilt will be
4750 * visible in /proc/mdstat
4752 md_new_event(mddev
);
4754 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
4757 last_check
= io_sectors
;
4759 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
4760 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
4764 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
4766 int next
= (last_mark
+1) % SYNC_MARKS
;
4768 mddev
->resync_mark
= mark
[next
];
4769 mddev
->resync_mark_cnt
= mark_cnt
[next
];
4770 mark
[next
] = jiffies
;
4771 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
4776 if (kthread_should_stop()) {
4778 * got a signal, exit.
4781 "md: md_do_sync() got signal ... exiting\n");
4782 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4787 * this loop exits only if either when we are slower than
4788 * the 'hard' speed limit, or the system was IO-idle for
4790 * the system might be non-idle CPU-wise, but we only care
4791 * about not overloading the IO subsystem. (things like an
4792 * e2fsck being done on the RAID array should execute fast)
4794 mddev
->queue
->unplug_fn(mddev
->queue
);
4797 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
4798 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
4800 if (currspeed
> speed_min(mddev
)) {
4801 if ((currspeed
> speed_max(mddev
)) ||
4802 !is_mddev_idle(mddev
)) {
4808 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
4810 * this also signals 'finished resyncing' to md_stop
4813 mddev
->queue
->unplug_fn(mddev
->queue
);
4815 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
4817 /* tell personality that we are finished */
4818 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
4820 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4821 test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
4822 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
4823 mddev
->curr_resync
> 2 &&
4824 mddev
->curr_resync
>= mddev
->recovery_cp
) {
4825 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4827 "md: checkpointing recovery of %s.\n",
4829 mddev
->recovery_cp
= mddev
->curr_resync
;
4831 mddev
->recovery_cp
= MaxSector
;
4835 mddev
->curr_resync
= 0;
4836 wake_up(&resync_wait
);
4837 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4838 md_wakeup_thread(mddev
->thread
);
4840 EXPORT_SYMBOL_GPL(md_do_sync
);
4844 * This routine is regularly called by all per-raid-array threads to
4845 * deal with generic issues like resync and super-block update.
4846 * Raid personalities that don't have a thread (linear/raid0) do not
4847 * need this as they never do any recovery or update the superblock.
4849 * It does not do any resync itself, but rather "forks" off other threads
4850 * to do that as needed.
4851 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4852 * "->recovery" and create a thread at ->sync_thread.
4853 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4854 * and wakeups up this thread which will reap the thread and finish up.
4855 * This thread also removes any faulty devices (with nr_pending == 0).
4857 * The overall approach is:
4858 * 1/ if the superblock needs updating, update it.
4859 * 2/ If a recovery thread is running, don't do anything else.
4860 * 3/ If recovery has finished, clean up, possibly marking spares active.
4861 * 4/ If there are any faulty devices, remove them.
4862 * 5/ If array is degraded, try to add spares devices
4863 * 6/ If array has spares or is not in-sync, start a resync thread.
4865 void md_check_recovery(mddev_t
*mddev
)
4868 struct list_head
*rtmp
;
4872 bitmap_daemon_work(mddev
->bitmap
);
4877 if (signal_pending(current
)) {
4878 if (mddev
->pers
->sync_request
) {
4879 printk(KERN_INFO
"md: %s in immediate safe mode\n",
4881 mddev
->safemode
= 2;
4883 flush_signals(current
);
4888 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
4889 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
4890 (mddev
->safemode
== 1) ||
4891 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
4892 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
4896 if (mddev_trylock(mddev
)==0) {
4899 spin_lock_irq(&mddev
->write_lock
);
4900 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
4901 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
4903 mddev
->sb_dirty
= 1;
4905 if (mddev
->safemode
== 1)
4906 mddev
->safemode
= 0;
4907 spin_unlock_irq(&mddev
->write_lock
);
4909 if (mddev
->sb_dirty
)
4910 md_update_sb(mddev
);
4913 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4914 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
4915 /* resync/recovery still happening */
4916 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4919 if (mddev
->sync_thread
) {
4920 /* resync has finished, collect result */
4921 md_unregister_thread(mddev
->sync_thread
);
4922 mddev
->sync_thread
= NULL
;
4923 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4924 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4926 /* activate any spares */
4927 mddev
->pers
->spare_active(mddev
);
4929 md_update_sb(mddev
);
4931 /* if array is no-longer degraded, then any saved_raid_disk
4932 * information must be scrapped
4934 if (!mddev
->degraded
)
4935 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4936 rdev
->saved_raid_disk
= -1;
4938 mddev
->recovery
= 0;
4939 /* flag recovery needed just to double check */
4940 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4941 md_new_event(mddev
);
4944 /* Clear some bits that don't mean anything, but
4947 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4948 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4949 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4950 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4952 /* no recovery is running.
4953 * remove any failed drives, then
4954 * add spares if possible.
4955 * Spare are also removed and re-added, to allow
4956 * the personality to fail the re-add.
4958 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4959 if (rdev
->raid_disk
>= 0 &&
4960 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
4961 atomic_read(&rdev
->nr_pending
)==0) {
4962 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
4964 sprintf(nm
,"rd%d", rdev
->raid_disk
);
4965 sysfs_remove_link(&mddev
->kobj
, nm
);
4966 rdev
->raid_disk
= -1;
4970 if (mddev
->degraded
) {
4971 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4972 if (rdev
->raid_disk
< 0
4973 && !test_bit(Faulty
, &rdev
->flags
)) {
4974 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
4976 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4977 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
4979 md_new_event(mddev
);
4986 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4987 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4988 } else if (mddev
->recovery_cp
< MaxSector
) {
4989 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4990 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4991 /* nothing to be done ... */
4994 if (mddev
->pers
->sync_request
) {
4995 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4996 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
4997 /* We are adding a device or devices to an array
4998 * which has the bitmap stored on all devices.
4999 * So make sure all bitmap pages get written
5001 bitmap_write_all(mddev
->bitmap
);
5003 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5006 if (!mddev
->sync_thread
) {
5007 printk(KERN_ERR
"%s: could not start resync"
5010 /* leave the spares where they are, it shouldn't hurt */
5011 mddev
->recovery
= 0;
5013 md_wakeup_thread(mddev
->sync_thread
);
5014 md_new_event(mddev
);
5017 mddev_unlock(mddev
);
5021 static int md_notify_reboot(struct notifier_block
*this,
5022 unsigned long code
, void *x
)
5024 struct list_head
*tmp
;
5027 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5029 printk(KERN_INFO
"md: stopping all md devices.\n");
5031 ITERATE_MDDEV(mddev
,tmp
)
5032 if (mddev_trylock(mddev
)==0)
5033 do_md_stop (mddev
, 1);
5035 * certain more exotic SCSI devices are known to be
5036 * volatile wrt too early system reboots. While the
5037 * right place to handle this issue is the given
5038 * driver, we do want to have a safe RAID driver ...
5045 static struct notifier_block md_notifier
= {
5046 .notifier_call
= md_notify_reboot
,
5048 .priority
= INT_MAX
, /* before any real devices */
5051 static void md_geninit(void)
5053 struct proc_dir_entry
*p
;
5055 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5057 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
5059 p
->proc_fops
= &md_seq_fops
;
5062 static int __init
md_init(void)
5066 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5067 " MD_SB_DISKS=%d\n",
5068 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
5069 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
5070 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
5073 if (register_blkdev(MAJOR_NR
, "md"))
5075 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5076 unregister_blkdev(MAJOR_NR
, "md");
5080 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
5081 md_probe
, NULL
, NULL
);
5082 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
5083 md_probe
, NULL
, NULL
);
5085 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
5086 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
5087 S_IFBLK
|S_IRUSR
|S_IWUSR
,
5090 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
5091 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
5092 S_IFBLK
|S_IRUSR
|S_IWUSR
,
5096 register_reboot_notifier(&md_notifier
);
5097 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
5107 * Searches all registered partitions for autorun RAID arrays
5110 static dev_t detected_devices
[128];
5113 void md_autodetect_dev(dev_t dev
)
5115 if (dev_cnt
>= 0 && dev_cnt
< 127)
5116 detected_devices
[dev_cnt
++] = dev
;
5120 static void autostart_arrays(int part
)
5125 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
5127 for (i
= 0; i
< dev_cnt
; i
++) {
5128 dev_t dev
= detected_devices
[i
];
5130 rdev
= md_import_device(dev
,0, 0);
5134 if (test_bit(Faulty
, &rdev
->flags
)) {
5138 list_add(&rdev
->same_set
, &pending_raid_disks
);
5142 autorun_devices(part
);
5147 static __exit
void md_exit(void)
5150 struct list_head
*tmp
;
5152 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
5153 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
5154 for (i
=0; i
< MAX_MD_DEVS
; i
++)
5155 devfs_remove("md/%d", i
);
5156 for (i
=0; i
< MAX_MD_DEVS
; i
++)
5157 devfs_remove("md/d%d", i
);
5161 unregister_blkdev(MAJOR_NR
,"md");
5162 unregister_blkdev(mdp_major
, "mdp");
5163 unregister_reboot_notifier(&md_notifier
);
5164 unregister_sysctl_table(raid_table_header
);
5165 remove_proc_entry("mdstat", NULL
);
5166 ITERATE_MDDEV(mddev
,tmp
) {
5167 struct gendisk
*disk
= mddev
->gendisk
;
5170 export_array(mddev
);
5173 mddev
->gendisk
= NULL
;
5178 module_init(md_init
)
5179 module_exit(md_exit
)
5181 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5183 return sprintf(buffer
, "%d", start_readonly
);
5185 static int set_ro(const char *val
, struct kernel_param
*kp
)
5188 int num
= simple_strtoul(val
, &e
, 10);
5189 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5190 start_readonly
= num
;
5196 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, 0600);
5197 module_param(start_dirty_degraded
, int, 0644);
5200 EXPORT_SYMBOL(register_md_personality
);
5201 EXPORT_SYMBOL(unregister_md_personality
);
5202 EXPORT_SYMBOL(md_error
);
5203 EXPORT_SYMBOL(md_done_sync
);
5204 EXPORT_SYMBOL(md_write_start
);
5205 EXPORT_SYMBOL(md_write_end
);
5206 EXPORT_SYMBOL(md_register_thread
);
5207 EXPORT_SYMBOL(md_unregister_thread
);
5208 EXPORT_SYMBOL(md_wakeup_thread
);
5209 EXPORT_SYMBOL(md_print_devices
);
5210 EXPORT_SYMBOL(md_check_recovery
);
5211 MODULE_LICENSE("GPL");
5213 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);