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>
47 #include <linux/init.h>
49 #include <linux/file.h>
52 #include <linux/kmod.h>
55 #include <asm/unaligned.h>
57 #define MAJOR_NR MD_MAJOR
60 /* 63 partitions with the alternate major number (mdp) */
61 #define MdpMinorShift 6
64 #define dprintk(x...) ((void)(DEBUG && printk(x)))
68 static void autostart_arrays (int part
);
71 static LIST_HEAD(pers_list
);
72 static DEFINE_SPINLOCK(pers_lock
);
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
78 * the RAID driver will use the maximum available bandwidth if the IO
79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
86 static int sysctl_speed_limit_min
= 1000;
87 static int sysctl_speed_limit_max
= 200000;
89 static struct ctl_table_header
*raid_table_header
;
91 static ctl_table raid_table
[] = {
93 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
94 .procname
= "speed_limit_min",
95 .data
= &sysctl_speed_limit_min
,
96 .maxlen
= sizeof(int),
98 .proc_handler
= &proc_dointvec
,
101 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
102 .procname
= "speed_limit_max",
103 .data
= &sysctl_speed_limit_max
,
104 .maxlen
= sizeof(int),
106 .proc_handler
= &proc_dointvec
,
111 static ctl_table raid_dir_table
[] = {
113 .ctl_name
= DEV_RAID
,
122 static ctl_table raid_root_table
[] = {
128 .child
= raid_dir_table
,
133 static struct block_device_operations md_fops
;
135 static int start_readonly
;
138 * We have a system wide 'event count' that is incremented
139 * on any 'interesting' event, and readers of /proc/mdstat
140 * can use 'poll' or 'select' to find out when the event
144 * start array, stop array, error, add device, remove device,
145 * start build, activate spare
147 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
148 static atomic_t md_event_count
;
149 static void md_new_event(mddev_t
*mddev
)
151 atomic_inc(&md_event_count
);
152 wake_up(&md_event_waiters
);
156 * Enables to iterate over all existing md arrays
157 * all_mddevs_lock protects this list.
159 static LIST_HEAD(all_mddevs
);
160 static DEFINE_SPINLOCK(all_mddevs_lock
);
164 * iterates through all used mddevs in the system.
165 * We take care to grab the all_mddevs_lock whenever navigating
166 * the list, and to always hold a refcount when unlocked.
167 * Any code which breaks out of this loop while own
168 * a reference to the current mddev and must mddev_put it.
170 #define ITERATE_MDDEV(mddev,tmp) \
172 for (({ spin_lock(&all_mddevs_lock); \
173 tmp = all_mddevs.next; \
175 ({ if (tmp != &all_mddevs) \
176 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
177 spin_unlock(&all_mddevs_lock); \
178 if (mddev) mddev_put(mddev); \
179 mddev = list_entry(tmp, mddev_t, all_mddevs); \
180 tmp != &all_mddevs;}); \
181 ({ spin_lock(&all_mddevs_lock); \
186 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
188 bio_io_error(bio
, bio
->bi_size
);
192 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
194 atomic_inc(&mddev
->active
);
198 static void mddev_put(mddev_t
*mddev
)
200 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
202 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
203 list_del(&mddev
->all_mddevs
);
204 blk_put_queue(mddev
->queue
);
205 kobject_unregister(&mddev
->kobj
);
207 spin_unlock(&all_mddevs_lock
);
210 static mddev_t
* mddev_find(dev_t unit
)
212 mddev_t
*mddev
, *new = NULL
;
215 spin_lock(&all_mddevs_lock
);
216 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
217 if (mddev
->unit
== unit
) {
219 spin_unlock(&all_mddevs_lock
);
225 list_add(&new->all_mddevs
, &all_mddevs
);
226 spin_unlock(&all_mddevs_lock
);
229 spin_unlock(&all_mddevs_lock
);
231 new = kzalloc(sizeof(*new), GFP_KERNEL
);
236 if (MAJOR(unit
) == MD_MAJOR
)
237 new->md_minor
= MINOR(unit
);
239 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
241 init_MUTEX(&new->reconfig_sem
);
242 INIT_LIST_HEAD(&new->disks
);
243 INIT_LIST_HEAD(&new->all_mddevs
);
244 init_timer(&new->safemode_timer
);
245 atomic_set(&new->active
, 1);
246 spin_lock_init(&new->write_lock
);
247 init_waitqueue_head(&new->sb_wait
);
249 new->queue
= blk_alloc_queue(GFP_KERNEL
);
255 blk_queue_make_request(new->queue
, md_fail_request
);
260 static inline int mddev_lock(mddev_t
* mddev
)
262 return down_interruptible(&mddev
->reconfig_sem
);
265 static inline void mddev_lock_uninterruptible(mddev_t
* mddev
)
267 down(&mddev
->reconfig_sem
);
270 static inline int mddev_trylock(mddev_t
* mddev
)
272 return down_trylock(&mddev
->reconfig_sem
);
275 static inline void mddev_unlock(mddev_t
* mddev
)
277 up(&mddev
->reconfig_sem
);
279 md_wakeup_thread(mddev
->thread
);
282 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
285 struct list_head
*tmp
;
287 ITERATE_RDEV(mddev
,rdev
,tmp
) {
288 if (rdev
->desc_nr
== nr
)
294 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
296 struct list_head
*tmp
;
299 ITERATE_RDEV(mddev
,rdev
,tmp
) {
300 if (rdev
->bdev
->bd_dev
== dev
)
306 static struct mdk_personality
*find_pers(int level
, char *clevel
)
308 struct mdk_personality
*pers
;
309 list_for_each_entry(pers
, &pers_list
, list
) {
310 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
312 if (strcmp(pers
->name
, clevel
)==0)
318 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
320 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
321 return MD_NEW_SIZE_BLOCKS(size
);
324 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
328 size
= rdev
->sb_offset
;
331 size
&= ~((sector_t
)chunk_size
/1024 - 1);
335 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
340 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
341 if (!rdev
->sb_page
) {
342 printk(KERN_ALERT
"md: out of memory.\n");
349 static void free_disk_sb(mdk_rdev_t
* rdev
)
352 put_page(rdev
->sb_page
);
354 rdev
->sb_page
= NULL
;
361 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
363 mdk_rdev_t
*rdev
= bio
->bi_private
;
364 mddev_t
*mddev
= rdev
->mddev
;
368 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
369 md_error(mddev
, rdev
);
371 if (atomic_dec_and_test(&mddev
->pending_writes
))
372 wake_up(&mddev
->sb_wait
);
377 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
379 struct bio
*bio2
= bio
->bi_private
;
380 mdk_rdev_t
*rdev
= bio2
->bi_private
;
381 mddev_t
*mddev
= rdev
->mddev
;
385 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
386 error
== -EOPNOTSUPP
) {
388 /* barriers don't appear to be supported :-( */
389 set_bit(BarriersNotsupp
, &rdev
->flags
);
390 mddev
->barriers_work
= 0;
391 spin_lock_irqsave(&mddev
->write_lock
, flags
);
392 bio2
->bi_next
= mddev
->biolist
;
393 mddev
->biolist
= bio2
;
394 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
395 wake_up(&mddev
->sb_wait
);
400 bio
->bi_private
= rdev
;
401 return super_written(bio
, bytes_done
, error
);
404 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
405 sector_t sector
, int size
, struct page
*page
)
407 /* write first size bytes of page to sector of rdev
408 * Increment mddev->pending_writes before returning
409 * and decrement it on completion, waking up sb_wait
410 * if zero is reached.
411 * If an error occurred, call md_error
413 * As we might need to resubmit the request if BIO_RW_BARRIER
414 * causes ENOTSUPP, we allocate a spare bio...
416 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
417 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
419 bio
->bi_bdev
= rdev
->bdev
;
420 bio
->bi_sector
= sector
;
421 bio_add_page(bio
, page
, size
, 0);
422 bio
->bi_private
= rdev
;
423 bio
->bi_end_io
= super_written
;
426 atomic_inc(&mddev
->pending_writes
);
427 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
429 rw
|= (1<<BIO_RW_BARRIER
);
430 rbio
= bio_clone(bio
, GFP_NOIO
);
431 rbio
->bi_private
= bio
;
432 rbio
->bi_end_io
= super_written_barrier
;
433 submit_bio(rw
, rbio
);
438 void md_super_wait(mddev_t
*mddev
)
440 /* wait for all superblock writes that were scheduled to complete.
441 * if any had to be retried (due to BARRIER problems), retry them
445 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
446 if (atomic_read(&mddev
->pending_writes
)==0)
448 while (mddev
->biolist
) {
450 spin_lock_irq(&mddev
->write_lock
);
451 bio
= mddev
->biolist
;
452 mddev
->biolist
= bio
->bi_next
;
454 spin_unlock_irq(&mddev
->write_lock
);
455 submit_bio(bio
->bi_rw
, bio
);
459 finish_wait(&mddev
->sb_wait
, &wq
);
462 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
467 complete((struct completion
*)bio
->bi_private
);
471 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
472 struct page
*page
, int rw
)
474 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
475 struct completion event
;
478 rw
|= (1 << BIO_RW_SYNC
);
481 bio
->bi_sector
= sector
;
482 bio_add_page(bio
, page
, size
, 0);
483 init_completion(&event
);
484 bio
->bi_private
= &event
;
485 bio
->bi_end_io
= bi_complete
;
487 wait_for_completion(&event
);
489 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
493 EXPORT_SYMBOL_GPL(sync_page_io
);
495 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
497 char b
[BDEVNAME_SIZE
];
498 if (!rdev
->sb_page
) {
506 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
512 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
513 bdevname(rdev
->bdev
,b
));
517 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
519 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
520 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
521 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
522 (sb1
->set_uuid3
== sb2
->set_uuid3
))
530 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
533 mdp_super_t
*tmp1
, *tmp2
;
535 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
536 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
538 if (!tmp1
|| !tmp2
) {
540 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
548 * nr_disks is not constant
553 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
564 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
566 unsigned int disk_csum
, csum
;
568 disk_csum
= sb
->sb_csum
;
570 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
571 sb
->sb_csum
= disk_csum
;
577 * Handle superblock details.
578 * We want to be able to handle multiple superblock formats
579 * so we have a common interface to them all, and an array of
580 * different handlers.
581 * We rely on user-space to write the initial superblock, and support
582 * reading and updating of superblocks.
583 * Interface methods are:
584 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
585 * loads and validates a superblock on dev.
586 * if refdev != NULL, compare superblocks on both devices
588 * 0 - dev has a superblock that is compatible with refdev
589 * 1 - dev has a superblock that is compatible and newer than refdev
590 * so dev should be used as the refdev in future
591 * -EINVAL superblock incompatible or invalid
592 * -othererror e.g. -EIO
594 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
595 * Verify that dev is acceptable into mddev.
596 * The first time, mddev->raid_disks will be 0, and data from
597 * dev should be merged in. Subsequent calls check that dev
598 * is new enough. Return 0 or -EINVAL
600 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
601 * Update the superblock for rdev with data in mddev
602 * This does not write to disc.
608 struct module
*owner
;
609 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
610 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
611 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
615 * load_super for 0.90.0
617 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
619 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
625 * Calculate the position of the superblock,
626 * it's at the end of the disk.
628 * It also happens to be a multiple of 4Kb.
630 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
631 rdev
->sb_offset
= sb_offset
;
633 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
638 bdevname(rdev
->bdev
, b
);
639 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
641 if (sb
->md_magic
!= MD_SB_MAGIC
) {
642 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
647 if (sb
->major_version
!= 0 ||
648 sb
->minor_version
!= 90) {
649 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
650 sb
->major_version
, sb
->minor_version
,
655 if (sb
->raid_disks
<= 0)
658 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
659 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
664 rdev
->preferred_minor
= sb
->md_minor
;
665 rdev
->data_offset
= 0;
666 rdev
->sb_size
= MD_SB_BYTES
;
668 if (sb
->level
== LEVEL_MULTIPATH
)
671 rdev
->desc_nr
= sb
->this_disk
.number
;
677 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
678 if (!uuid_equal(refsb
, sb
)) {
679 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
680 b
, bdevname(refdev
->bdev
,b2
));
683 if (!sb_equal(refsb
, sb
)) {
684 printk(KERN_WARNING
"md: %s has same UUID"
685 " but different superblock to %s\n",
686 b
, bdevname(refdev
->bdev
, b2
));
690 ev2
= md_event(refsb
);
696 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
703 * validate_super for 0.90.0
705 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
708 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
710 rdev
->raid_disk
= -1;
712 if (mddev
->raid_disks
== 0) {
713 mddev
->major_version
= 0;
714 mddev
->minor_version
= sb
->minor_version
;
715 mddev
->patch_version
= sb
->patch_version
;
716 mddev
->persistent
= ! sb
->not_persistent
;
717 mddev
->chunk_size
= sb
->chunk_size
;
718 mddev
->ctime
= sb
->ctime
;
719 mddev
->utime
= sb
->utime
;
720 mddev
->level
= sb
->level
;
721 mddev
->clevel
[0] = 0;
722 mddev
->layout
= sb
->layout
;
723 mddev
->raid_disks
= sb
->raid_disks
;
724 mddev
->size
= sb
->size
;
725 mddev
->events
= md_event(sb
);
726 mddev
->bitmap_offset
= 0;
727 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
729 if (sb
->state
& (1<<MD_SB_CLEAN
))
730 mddev
->recovery_cp
= MaxSector
;
732 if (sb
->events_hi
== sb
->cp_events_hi
&&
733 sb
->events_lo
== sb
->cp_events_lo
) {
734 mddev
->recovery_cp
= sb
->recovery_cp
;
736 mddev
->recovery_cp
= 0;
739 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
740 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
741 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
742 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
744 mddev
->max_disks
= MD_SB_DISKS
;
746 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
747 mddev
->bitmap_file
== NULL
) {
748 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
749 && mddev
->level
!= 10) {
750 /* FIXME use a better test */
751 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
754 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
757 } else if (mddev
->pers
== NULL
) {
758 /* Insist on good event counter while assembling */
759 __u64 ev1
= md_event(sb
);
761 if (ev1
< mddev
->events
)
763 } else if (mddev
->bitmap
) {
764 /* if adding to array with a bitmap, then we can accept an
765 * older device ... but not too old.
767 __u64 ev1
= md_event(sb
);
768 if (ev1
< mddev
->bitmap
->events_cleared
)
770 } else /* just a hot-add of a new device, leave raid_disk at -1 */
773 if (mddev
->level
!= LEVEL_MULTIPATH
) {
774 desc
= sb
->disks
+ rdev
->desc_nr
;
776 if (desc
->state
& (1<<MD_DISK_FAULTY
))
777 set_bit(Faulty
, &rdev
->flags
);
778 else if (desc
->state
& (1<<MD_DISK_SYNC
) &&
779 desc
->raid_disk
< mddev
->raid_disks
) {
780 set_bit(In_sync
, &rdev
->flags
);
781 rdev
->raid_disk
= desc
->raid_disk
;
783 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
784 set_bit(WriteMostly
, &rdev
->flags
);
785 } else /* MULTIPATH are always insync */
786 set_bit(In_sync
, &rdev
->flags
);
791 * sync_super for 0.90.0
793 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
796 struct list_head
*tmp
;
798 int next_spare
= mddev
->raid_disks
;
801 /* make rdev->sb match mddev data..
804 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
805 * 3/ any empty disks < next_spare become removed
807 * disks[0] gets initialised to REMOVED because
808 * we cannot be sure from other fields if it has
809 * been initialised or not.
812 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
814 rdev
->sb_size
= MD_SB_BYTES
;
816 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
818 memset(sb
, 0, sizeof(*sb
));
820 sb
->md_magic
= MD_SB_MAGIC
;
821 sb
->major_version
= mddev
->major_version
;
822 sb
->minor_version
= mddev
->minor_version
;
823 sb
->patch_version
= mddev
->patch_version
;
824 sb
->gvalid_words
= 0; /* ignored */
825 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
826 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
827 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
828 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
830 sb
->ctime
= mddev
->ctime
;
831 sb
->level
= mddev
->level
;
832 sb
->size
= mddev
->size
;
833 sb
->raid_disks
= mddev
->raid_disks
;
834 sb
->md_minor
= mddev
->md_minor
;
835 sb
->not_persistent
= !mddev
->persistent
;
836 sb
->utime
= mddev
->utime
;
838 sb
->events_hi
= (mddev
->events
>>32);
839 sb
->events_lo
= (u32
)mddev
->events
;
843 sb
->recovery_cp
= mddev
->recovery_cp
;
844 sb
->cp_events_hi
= (mddev
->events
>>32);
845 sb
->cp_events_lo
= (u32
)mddev
->events
;
846 if (mddev
->recovery_cp
== MaxSector
)
847 sb
->state
= (1<< MD_SB_CLEAN
);
851 sb
->layout
= mddev
->layout
;
852 sb
->chunk_size
= mddev
->chunk_size
;
854 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
855 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
857 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
858 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
861 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
862 && !test_bit(Faulty
, &rdev2
->flags
))
863 desc_nr
= rdev2
->raid_disk
;
865 desc_nr
= next_spare
++;
866 rdev2
->desc_nr
= desc_nr
;
867 d
= &sb
->disks
[rdev2
->desc_nr
];
869 d
->number
= rdev2
->desc_nr
;
870 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
871 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
872 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
873 && !test_bit(Faulty
, &rdev2
->flags
))
874 d
->raid_disk
= rdev2
->raid_disk
;
876 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
877 if (test_bit(Faulty
, &rdev2
->flags
)) {
878 d
->state
= (1<<MD_DISK_FAULTY
);
880 } else if (test_bit(In_sync
, &rdev2
->flags
)) {
881 d
->state
= (1<<MD_DISK_ACTIVE
);
882 d
->state
|= (1<<MD_DISK_SYNC
);
890 if (test_bit(WriteMostly
, &rdev2
->flags
))
891 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
893 /* now set the "removed" and "faulty" bits on any missing devices */
894 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
895 mdp_disk_t
*d
= &sb
->disks
[i
];
896 if (d
->state
== 0 && d
->number
== 0) {
899 d
->state
= (1<<MD_DISK_REMOVED
);
900 d
->state
|= (1<<MD_DISK_FAULTY
);
904 sb
->nr_disks
= nr_disks
;
905 sb
->active_disks
= active
;
906 sb
->working_disks
= working
;
907 sb
->failed_disks
= failed
;
908 sb
->spare_disks
= spare
;
910 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
911 sb
->sb_csum
= calc_sb_csum(sb
);
915 * version 1 superblock
918 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
920 unsigned int disk_csum
, csum
;
921 unsigned long long newcsum
;
922 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
923 unsigned int *isuper
= (unsigned int*)sb
;
926 disk_csum
= sb
->sb_csum
;
929 for (i
=0; size
>=4; size
-= 4 )
930 newcsum
+= le32_to_cpu(*isuper
++);
933 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
935 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
936 sb
->sb_csum
= disk_csum
;
937 return cpu_to_le32(csum
);
940 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
942 struct mdp_superblock_1
*sb
;
945 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
949 * Calculate the position of the superblock.
950 * It is always aligned to a 4K boundary and
951 * depeding on minor_version, it can be:
952 * 0: At least 8K, but less than 12K, from end of device
953 * 1: At start of device
954 * 2: 4K from start of device.
956 switch(minor_version
) {
958 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
960 sb_offset
&= ~(sector_t
)(4*2-1);
961 /* convert from sectors to K */
973 rdev
->sb_offset
= sb_offset
;
975 /* superblock is rarely larger than 1K, but it can be larger,
976 * and it is safe to read 4k, so we do that
978 ret
= read_disk_sb(rdev
, 4096);
982 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
984 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
985 sb
->major_version
!= cpu_to_le32(1) ||
986 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
987 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
988 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
991 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
992 printk("md: invalid superblock checksum on %s\n",
993 bdevname(rdev
->bdev
,b
));
996 if (le64_to_cpu(sb
->data_size
) < 10) {
997 printk("md: data_size too small on %s\n",
998 bdevname(rdev
->bdev
,b
));
1001 rdev
->preferred_minor
= 0xffff;
1002 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1003 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1005 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1006 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1007 if (rdev
->sb_size
& bmask
)
1008 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1014 struct mdp_superblock_1
*refsb
=
1015 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1017 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1018 sb
->level
!= refsb
->level
||
1019 sb
->layout
!= refsb
->layout
||
1020 sb
->chunksize
!= refsb
->chunksize
) {
1021 printk(KERN_WARNING
"md: %s has strangely different"
1022 " superblock to %s\n",
1023 bdevname(rdev
->bdev
,b
),
1024 bdevname(refdev
->bdev
,b2
));
1027 ev1
= le64_to_cpu(sb
->events
);
1028 ev2
= le64_to_cpu(refsb
->events
);
1034 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1036 rdev
->size
= rdev
->sb_offset
;
1037 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1039 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1040 if (le32_to_cpu(sb
->chunksize
))
1041 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1045 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1047 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1049 rdev
->raid_disk
= -1;
1051 if (mddev
->raid_disks
== 0) {
1052 mddev
->major_version
= 1;
1053 mddev
->patch_version
= 0;
1054 mddev
->persistent
= 1;
1055 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1056 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1057 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1058 mddev
->level
= le32_to_cpu(sb
->level
);
1059 mddev
->clevel
[0] = 0;
1060 mddev
->layout
= le32_to_cpu(sb
->layout
);
1061 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1062 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1063 mddev
->events
= le64_to_cpu(sb
->events
);
1064 mddev
->bitmap_offset
= 0;
1065 mddev
->default_bitmap_offset
= 1024;
1067 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1068 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1070 mddev
->max_disks
= (4096-256)/2;
1072 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1073 mddev
->bitmap_file
== NULL
) {
1074 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
1075 && mddev
->level
!= 10) {
1076 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
1079 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1081 } else if (mddev
->pers
== NULL
) {
1082 /* Insist of good event counter while assembling */
1083 __u64 ev1
= le64_to_cpu(sb
->events
);
1085 if (ev1
< mddev
->events
)
1087 } else if (mddev
->bitmap
) {
1088 /* If adding to array with a bitmap, then we can accept an
1089 * older device, but not too old.
1091 __u64 ev1
= le64_to_cpu(sb
->events
);
1092 if (ev1
< mddev
->bitmap
->events_cleared
)
1094 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1097 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1099 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1100 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1102 case 0xffff: /* spare */
1104 case 0xfffe: /* faulty */
1105 set_bit(Faulty
, &rdev
->flags
);
1108 set_bit(In_sync
, &rdev
->flags
);
1109 rdev
->raid_disk
= role
;
1112 if (sb
->devflags
& WriteMostly1
)
1113 set_bit(WriteMostly
, &rdev
->flags
);
1114 } else /* MULTIPATH are always insync */
1115 set_bit(In_sync
, &rdev
->flags
);
1120 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1122 struct mdp_superblock_1
*sb
;
1123 struct list_head
*tmp
;
1126 /* make rdev->sb match mddev and rdev data. */
1128 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1130 sb
->feature_map
= 0;
1132 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1133 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1134 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1136 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1137 sb
->events
= cpu_to_le64(mddev
->events
);
1139 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1141 sb
->resync_offset
= cpu_to_le64(0);
1143 sb
->cnt_corrected_read
= atomic_read(&rdev
->corrected_errors
);
1145 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1146 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1147 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1151 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1152 if (rdev2
->desc_nr
+1 > max_dev
)
1153 max_dev
= rdev2
->desc_nr
+1;
1155 sb
->max_dev
= cpu_to_le32(max_dev
);
1156 for (i
=0; i
<max_dev
;i
++)
1157 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1159 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1161 if (test_bit(Faulty
, &rdev2
->flags
))
1162 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1163 else if (test_bit(In_sync
, &rdev2
->flags
))
1164 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1166 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1169 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1170 sb
->sb_csum
= calc_sb_1_csum(sb
);
1174 static struct super_type super_types
[] = {
1177 .owner
= THIS_MODULE
,
1178 .load_super
= super_90_load
,
1179 .validate_super
= super_90_validate
,
1180 .sync_super
= super_90_sync
,
1184 .owner
= THIS_MODULE
,
1185 .load_super
= super_1_load
,
1186 .validate_super
= super_1_validate
,
1187 .sync_super
= super_1_sync
,
1191 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1193 struct list_head
*tmp
;
1196 ITERATE_RDEV(mddev
,rdev
,tmp
)
1197 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1203 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1205 struct list_head
*tmp
;
1208 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1209 if (match_dev_unit(mddev2
, rdev
))
1215 static LIST_HEAD(pending_raid_disks
);
1217 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1219 mdk_rdev_t
*same_pdev
;
1220 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1227 same_pdev
= match_dev_unit(mddev
, rdev
);
1230 "%s: WARNING: %s appears to be on the same physical"
1231 " disk as %s. True\n protection against single-disk"
1232 " failure might be compromised.\n",
1233 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1234 bdevname(same_pdev
->bdev
,b2
));
1236 /* Verify rdev->desc_nr is unique.
1237 * If it is -1, assign a free number, else
1238 * check number is not in use
1240 if (rdev
->desc_nr
< 0) {
1242 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1243 while (find_rdev_nr(mddev
, choice
))
1245 rdev
->desc_nr
= choice
;
1247 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1250 bdevname(rdev
->bdev
,b
);
1251 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1254 list_add(&rdev
->same_set
, &mddev
->disks
);
1255 rdev
->mddev
= mddev
;
1256 printk(KERN_INFO
"md: bind<%s>\n", b
);
1258 rdev
->kobj
.parent
= &mddev
->kobj
;
1259 kobject_add(&rdev
->kobj
);
1261 if (rdev
->bdev
->bd_part
)
1262 ko
= &rdev
->bdev
->bd_part
->kobj
;
1264 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1265 sysfs_create_link(&rdev
->kobj
, ko
, "block");
1269 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1271 char b
[BDEVNAME_SIZE
];
1276 list_del_init(&rdev
->same_set
);
1277 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1279 sysfs_remove_link(&rdev
->kobj
, "block");
1280 kobject_del(&rdev
->kobj
);
1284 * prevent the device from being mounted, repartitioned or
1285 * otherwise reused by a RAID array (or any other kernel
1286 * subsystem), by bd_claiming the device.
1288 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1291 struct block_device
*bdev
;
1292 char b
[BDEVNAME_SIZE
];
1294 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1296 printk(KERN_ERR
"md: could not open %s.\n",
1297 __bdevname(dev
, b
));
1298 return PTR_ERR(bdev
);
1300 err
= bd_claim(bdev
, rdev
);
1302 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1311 static void unlock_rdev(mdk_rdev_t
*rdev
)
1313 struct block_device
*bdev
= rdev
->bdev
;
1321 void md_autodetect_dev(dev_t dev
);
1323 static void export_rdev(mdk_rdev_t
* rdev
)
1325 char b
[BDEVNAME_SIZE
];
1326 printk(KERN_INFO
"md: export_rdev(%s)\n",
1327 bdevname(rdev
->bdev
,b
));
1331 list_del_init(&rdev
->same_set
);
1333 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1336 kobject_put(&rdev
->kobj
);
1339 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1341 unbind_rdev_from_array(rdev
);
1345 static void export_array(mddev_t
*mddev
)
1347 struct list_head
*tmp
;
1350 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1355 kick_rdev_from_array(rdev
);
1357 if (!list_empty(&mddev
->disks
))
1359 mddev
->raid_disks
= 0;
1360 mddev
->major_version
= 0;
1363 static void print_desc(mdp_disk_t
*desc
)
1365 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1366 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1369 static void print_sb(mdp_super_t
*sb
)
1374 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1375 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1376 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1378 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1379 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1380 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1381 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1382 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1383 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1384 sb
->failed_disks
, sb
->spare_disks
,
1385 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1388 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1391 desc
= sb
->disks
+ i
;
1392 if (desc
->number
|| desc
->major
|| desc
->minor
||
1393 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1394 printk(" D %2d: ", i
);
1398 printk(KERN_INFO
"md: THIS: ");
1399 print_desc(&sb
->this_disk
);
1403 static void print_rdev(mdk_rdev_t
*rdev
)
1405 char b
[BDEVNAME_SIZE
];
1406 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1407 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1408 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1410 if (rdev
->sb_loaded
) {
1411 printk(KERN_INFO
"md: rdev superblock:\n");
1412 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1414 printk(KERN_INFO
"md: no rdev superblock!\n");
1417 void md_print_devices(void)
1419 struct list_head
*tmp
, *tmp2
;
1422 char b
[BDEVNAME_SIZE
];
1425 printk("md: **********************************\n");
1426 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1427 printk("md: **********************************\n");
1428 ITERATE_MDDEV(mddev
,tmp
) {
1431 bitmap_print_sb(mddev
->bitmap
);
1433 printk("%s: ", mdname(mddev
));
1434 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1435 printk("<%s>", bdevname(rdev
->bdev
,b
));
1438 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1441 printk("md: **********************************\n");
1446 static void sync_sbs(mddev_t
* mddev
)
1449 struct list_head
*tmp
;
1451 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1452 super_types
[mddev
->major_version
].
1453 sync_super(mddev
, rdev
);
1454 rdev
->sb_loaded
= 1;
1458 static void md_update_sb(mddev_t
* mddev
)
1461 struct list_head
*tmp
;
1466 spin_lock_irq(&mddev
->write_lock
);
1467 sync_req
= mddev
->in_sync
;
1468 mddev
->utime
= get_seconds();
1471 if (!mddev
->events
) {
1473 * oops, this 64-bit counter should never wrap.
1474 * Either we are in around ~1 trillion A.C., assuming
1475 * 1 reboot per second, or we have a bug:
1480 mddev
->sb_dirty
= 2;
1484 * do not write anything to disk if using
1485 * nonpersistent superblocks
1487 if (!mddev
->persistent
) {
1488 mddev
->sb_dirty
= 0;
1489 spin_unlock_irq(&mddev
->write_lock
);
1490 wake_up(&mddev
->sb_wait
);
1493 spin_unlock_irq(&mddev
->write_lock
);
1496 "md: updating %s RAID superblock on device (in sync %d)\n",
1497 mdname(mddev
),mddev
->in_sync
);
1499 err
= bitmap_update_sb(mddev
->bitmap
);
1500 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1501 char b
[BDEVNAME_SIZE
];
1502 dprintk(KERN_INFO
"md: ");
1503 if (test_bit(Faulty
, &rdev
->flags
))
1504 dprintk("(skipping faulty ");
1506 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1507 if (!test_bit(Faulty
, &rdev
->flags
)) {
1508 md_super_write(mddev
,rdev
,
1509 rdev
->sb_offset
<<1, rdev
->sb_size
,
1511 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1512 bdevname(rdev
->bdev
,b
),
1513 (unsigned long long)rdev
->sb_offset
);
1517 if (mddev
->level
== LEVEL_MULTIPATH
)
1518 /* only need to write one superblock... */
1521 md_super_wait(mddev
);
1522 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1524 spin_lock_irq(&mddev
->write_lock
);
1525 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1526 /* have to write it out again */
1527 spin_unlock_irq(&mddev
->write_lock
);
1530 mddev
->sb_dirty
= 0;
1531 spin_unlock_irq(&mddev
->write_lock
);
1532 wake_up(&mddev
->sb_wait
);
1536 /* words written to sysfs files may, or my not, be \n terminated.
1537 * We want to accept with case. For this we use cmd_match.
1539 static int cmd_match(const char *cmd
, const char *str
)
1541 /* See if cmd, written into a sysfs file, matches
1542 * str. They must either be the same, or cmd can
1543 * have a trailing newline
1545 while (*cmd
&& *str
&& *cmd
== *str
) {
1556 struct rdev_sysfs_entry
{
1557 struct attribute attr
;
1558 ssize_t (*show
)(mdk_rdev_t
*, char *);
1559 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1563 state_show(mdk_rdev_t
*rdev
, char *page
)
1568 if (test_bit(Faulty
, &rdev
->flags
)) {
1569 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1572 if (test_bit(In_sync
, &rdev
->flags
)) {
1573 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1576 if (!test_bit(Faulty
, &rdev
->flags
) &&
1577 !test_bit(In_sync
, &rdev
->flags
)) {
1578 len
+= sprintf(page
+len
, "%sspare", sep
);
1581 return len
+sprintf(page
+len
, "\n");
1584 static struct rdev_sysfs_entry
1585 rdev_state
= __ATTR_RO(state
);
1588 super_show(mdk_rdev_t
*rdev
, char *page
)
1590 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1591 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1592 return rdev
->sb_size
;
1596 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1599 errors_show(mdk_rdev_t
*rdev
, char *page
)
1601 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1605 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1608 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1609 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1610 atomic_set(&rdev
->corrected_errors
, n
);
1615 static struct rdev_sysfs_entry rdev_errors
=
1616 __ATTR(errors
, 0644, errors_show
, errors_store
);
1618 static struct attribute
*rdev_default_attrs
[] = {
1625 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1627 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1628 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1632 return entry
->show(rdev
, page
);
1636 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1637 const char *page
, size_t length
)
1639 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1640 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1644 return entry
->store(rdev
, page
, length
);
1647 static void rdev_free(struct kobject
*ko
)
1649 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1652 static struct sysfs_ops rdev_sysfs_ops
= {
1653 .show
= rdev_attr_show
,
1654 .store
= rdev_attr_store
,
1656 static struct kobj_type rdev_ktype
= {
1657 .release
= rdev_free
,
1658 .sysfs_ops
= &rdev_sysfs_ops
,
1659 .default_attrs
= rdev_default_attrs
,
1663 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1665 * mark the device faulty if:
1667 * - the device is nonexistent (zero size)
1668 * - the device has no valid superblock
1670 * a faulty rdev _never_ has rdev->sb set.
1672 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1674 char b
[BDEVNAME_SIZE
];
1679 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
1681 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1682 return ERR_PTR(-ENOMEM
);
1685 if ((err
= alloc_disk_sb(rdev
)))
1688 err
= lock_rdev(rdev
, newdev
);
1692 rdev
->kobj
.parent
= NULL
;
1693 rdev
->kobj
.ktype
= &rdev_ktype
;
1694 kobject_init(&rdev
->kobj
);
1698 rdev
->data_offset
= 0;
1699 atomic_set(&rdev
->nr_pending
, 0);
1700 atomic_set(&rdev
->read_errors
, 0);
1701 atomic_set(&rdev
->corrected_errors
, 0);
1703 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1706 "md: %s has zero or unknown size, marking faulty!\n",
1707 bdevname(rdev
->bdev
,b
));
1712 if (super_format
>= 0) {
1713 err
= super_types
[super_format
].
1714 load_super(rdev
, NULL
, super_minor
);
1715 if (err
== -EINVAL
) {
1717 "md: %s has invalid sb, not importing!\n",
1718 bdevname(rdev
->bdev
,b
));
1723 "md: could not read %s's sb, not importing!\n",
1724 bdevname(rdev
->bdev
,b
));
1728 INIT_LIST_HEAD(&rdev
->same_set
);
1733 if (rdev
->sb_page
) {
1739 return ERR_PTR(err
);
1743 * Check a full RAID array for plausibility
1747 static void analyze_sbs(mddev_t
* mddev
)
1750 struct list_head
*tmp
;
1751 mdk_rdev_t
*rdev
, *freshest
;
1752 char b
[BDEVNAME_SIZE
];
1755 ITERATE_RDEV(mddev
,rdev
,tmp
)
1756 switch (super_types
[mddev
->major_version
].
1757 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1765 "md: fatal superblock inconsistency in %s"
1766 " -- removing from array\n",
1767 bdevname(rdev
->bdev
,b
));
1768 kick_rdev_from_array(rdev
);
1772 super_types
[mddev
->major_version
].
1773 validate_super(mddev
, freshest
);
1776 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1777 if (rdev
!= freshest
)
1778 if (super_types
[mddev
->major_version
].
1779 validate_super(mddev
, rdev
)) {
1780 printk(KERN_WARNING
"md: kicking non-fresh %s"
1782 bdevname(rdev
->bdev
,b
));
1783 kick_rdev_from_array(rdev
);
1786 if (mddev
->level
== LEVEL_MULTIPATH
) {
1787 rdev
->desc_nr
= i
++;
1788 rdev
->raid_disk
= rdev
->desc_nr
;
1789 set_bit(In_sync
, &rdev
->flags
);
1795 if (mddev
->recovery_cp
!= MaxSector
&&
1797 printk(KERN_ERR
"md: %s: raid array is not clean"
1798 " -- starting background reconstruction\n",
1804 level_show(mddev_t
*mddev
, char *page
)
1806 struct mdk_personality
*p
= mddev
->pers
;
1808 return sprintf(page
, "%s\n", p
->name
);
1809 else if (mddev
->clevel
[0])
1810 return sprintf(page
, "%s\n", mddev
->clevel
);
1811 else if (mddev
->level
!= LEVEL_NONE
)
1812 return sprintf(page
, "%d\n", mddev
->level
);
1818 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1825 if (len
>= sizeof(mddev
->clevel
))
1827 strncpy(mddev
->clevel
, buf
, len
);
1828 if (mddev
->clevel
[len
-1] == '\n')
1830 mddev
->clevel
[len
] = 0;
1831 mddev
->level
= LEVEL_NONE
;
1835 static struct md_sysfs_entry md_level
=
1836 __ATTR(level
, 0644, level_show
, level_store
);
1839 raid_disks_show(mddev_t
*mddev
, char *page
)
1841 if (mddev
->raid_disks
== 0)
1843 return sprintf(page
, "%d\n", mddev
->raid_disks
);
1846 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
1849 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1851 /* can only set raid_disks if array is not yet active */
1854 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1856 if (!*buf
|| (*e
&& *e
!= '\n'))
1860 rv
= update_raid_disks(mddev
, n
);
1862 mddev
->raid_disks
= n
;
1863 return rv
? rv
: len
;
1865 static struct md_sysfs_entry md_raid_disks
=
1866 __ATTR(raid_disks
, 0644, raid_disks_show
, raid_disks_store
);
1869 chunk_size_show(mddev_t
*mddev
, char *page
)
1871 return sprintf(page
, "%d\n", mddev
->chunk_size
);
1875 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1877 /* can only set chunk_size if array is not yet active */
1879 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1883 if (!*buf
|| (*e
&& *e
!= '\n'))
1886 mddev
->chunk_size
= n
;
1889 static struct md_sysfs_entry md_chunk_size
=
1890 __ATTR(chunk_size
, 0644, chunk_size_show
, chunk_size_store
);
1894 size_show(mddev_t
*mddev
, char *page
)
1896 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
1899 static int update_size(mddev_t
*mddev
, unsigned long size
);
1902 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1904 /* If array is inactive, we can reduce the component size, but
1905 * not increase it (except from 0).
1906 * If array is active, we can try an on-line resize
1910 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1911 if (!*buf
|| *buf
== '\n' ||
1916 err
= update_size(mddev
, size
);
1917 md_update_sb(mddev
);
1919 if (mddev
->size
== 0 ||
1925 return err
? err
: len
;
1928 static struct md_sysfs_entry md_size
=
1929 __ATTR(component_size
, 0644, size_show
, size_store
);
1933 * This is either 'none' for arrays with externally managed metadata,
1934 * or N.M for internally known formats
1937 metadata_show(mddev_t
*mddev
, char *page
)
1939 if (mddev
->persistent
)
1940 return sprintf(page
, "%d.%d\n",
1941 mddev
->major_version
, mddev
->minor_version
);
1943 return sprintf(page
, "none\n");
1947 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1951 if (!list_empty(&mddev
->disks
))
1954 if (cmd_match(buf
, "none")) {
1955 mddev
->persistent
= 0;
1956 mddev
->major_version
= 0;
1957 mddev
->minor_version
= 90;
1960 major
= simple_strtoul(buf
, &e
, 10);
1961 if (e
==buf
|| *e
!= '.')
1964 minor
= simple_strtoul(buf
, &e
, 10);
1965 if (e
==buf
|| *e
!= '\n')
1967 if (major
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
1968 super_types
[major
].name
== NULL
)
1970 mddev
->major_version
= major
;
1971 mddev
->minor_version
= minor
;
1972 mddev
->persistent
= 1;
1976 static struct md_sysfs_entry md_metadata
=
1977 __ATTR(metadata_version
, 0644, metadata_show
, metadata_store
);
1980 action_show(mddev_t
*mddev
, char *page
)
1982 char *type
= "idle";
1983 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
1984 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
1985 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
1986 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
1988 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
1995 return sprintf(page
, "%s\n", type
);
1999 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2001 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2004 if (cmd_match(page
, "idle")) {
2005 if (mddev
->sync_thread
) {
2006 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2007 md_unregister_thread(mddev
->sync_thread
);
2008 mddev
->sync_thread
= NULL
;
2009 mddev
->recovery
= 0;
2011 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2012 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2014 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2015 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2017 if (cmd_match(page
, "check"))
2018 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2019 else if (cmd_match(page
, "repair"))
2021 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2022 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2024 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2025 md_wakeup_thread(mddev
->thread
);
2030 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2032 return sprintf(page
, "%llu\n",
2033 (unsigned long long) mddev
->resync_mismatches
);
2036 static struct md_sysfs_entry
2037 md_scan_mode
= __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2040 static struct md_sysfs_entry
2041 md_mismatches
= __ATTR_RO(mismatch_cnt
);
2043 static struct attribute
*md_default_attrs
[] = {
2045 &md_raid_disks
.attr
,
2046 &md_chunk_size
.attr
,
2052 static struct attribute
*md_redundancy_attrs
[] = {
2054 &md_mismatches
.attr
,
2057 static struct attribute_group md_redundancy_group
= {
2059 .attrs
= md_redundancy_attrs
,
2064 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2066 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2067 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2073 rv
= entry
->show(mddev
, page
);
2074 mddev_unlock(mddev
);
2079 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2080 const char *page
, size_t length
)
2082 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2083 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2089 rv
= entry
->store(mddev
, page
, length
);
2090 mddev_unlock(mddev
);
2094 static void md_free(struct kobject
*ko
)
2096 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
2100 static struct sysfs_ops md_sysfs_ops
= {
2101 .show
= md_attr_show
,
2102 .store
= md_attr_store
,
2104 static struct kobj_type md_ktype
= {
2106 .sysfs_ops
= &md_sysfs_ops
,
2107 .default_attrs
= md_default_attrs
,
2112 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
2114 static DECLARE_MUTEX(disks_sem
);
2115 mddev_t
*mddev
= mddev_find(dev
);
2116 struct gendisk
*disk
;
2117 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
2118 int shift
= partitioned
? MdpMinorShift
: 0;
2119 int unit
= MINOR(dev
) >> shift
;
2125 if (mddev
->gendisk
) {
2130 disk
= alloc_disk(1 << shift
);
2136 disk
->major
= MAJOR(dev
);
2137 disk
->first_minor
= unit
<< shift
;
2139 sprintf(disk
->disk_name
, "md_d%d", unit
);
2140 sprintf(disk
->devfs_name
, "md/d%d", unit
);
2142 sprintf(disk
->disk_name
, "md%d", unit
);
2143 sprintf(disk
->devfs_name
, "md/%d", unit
);
2145 disk
->fops
= &md_fops
;
2146 disk
->private_data
= mddev
;
2147 disk
->queue
= mddev
->queue
;
2149 mddev
->gendisk
= disk
;
2151 mddev
->kobj
.parent
= &disk
->kobj
;
2152 mddev
->kobj
.k_name
= NULL
;
2153 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
2154 mddev
->kobj
.ktype
= &md_ktype
;
2155 kobject_register(&mddev
->kobj
);
2159 void md_wakeup_thread(mdk_thread_t
*thread
);
2161 static void md_safemode_timeout(unsigned long data
)
2163 mddev_t
*mddev
= (mddev_t
*) data
;
2165 mddev
->safemode
= 1;
2166 md_wakeup_thread(mddev
->thread
);
2169 static int start_dirty_degraded
;
2171 static int do_md_run(mddev_t
* mddev
)
2175 struct list_head
*tmp
;
2177 struct gendisk
*disk
;
2178 struct mdk_personality
*pers
;
2179 char b
[BDEVNAME_SIZE
];
2181 if (list_empty(&mddev
->disks
))
2182 /* cannot run an array with no devices.. */
2189 * Analyze all RAID superblock(s)
2191 if (!mddev
->raid_disks
)
2194 chunk_size
= mddev
->chunk_size
;
2197 if (chunk_size
> MAX_CHUNK_SIZE
) {
2198 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
2199 chunk_size
, MAX_CHUNK_SIZE
);
2203 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2205 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
2206 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
2209 if (chunk_size
< PAGE_SIZE
) {
2210 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
2211 chunk_size
, PAGE_SIZE
);
2215 /* devices must have minimum size of one chunk */
2216 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2217 if (test_bit(Faulty
, &rdev
->flags
))
2219 if (rdev
->size
< chunk_size
/ 1024) {
2221 "md: Dev %s smaller than chunk_size:"
2223 bdevname(rdev
->bdev
,b
),
2224 (unsigned long long)rdev
->size
,
2232 if (mddev
->level
!= LEVEL_NONE
)
2233 request_module("md-level-%d", mddev
->level
);
2234 else if (mddev
->clevel
[0])
2235 request_module("md-%s", mddev
->clevel
);
2239 * Drop all container device buffers, from now on
2240 * the only valid external interface is through the md
2242 * Also find largest hardsector size
2244 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2245 if (test_bit(Faulty
, &rdev
->flags
))
2247 sync_blockdev(rdev
->bdev
);
2248 invalidate_bdev(rdev
->bdev
, 0);
2251 md_probe(mddev
->unit
, NULL
, NULL
);
2252 disk
= mddev
->gendisk
;
2256 spin_lock(&pers_lock
);
2257 pers
= find_pers(mddev
->level
, mddev
->clevel
);
2258 if (!pers
|| !try_module_get(pers
->owner
)) {
2259 spin_unlock(&pers_lock
);
2260 if (mddev
->level
!= LEVEL_NONE
)
2261 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
2264 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
2269 spin_unlock(&pers_lock
);
2270 mddev
->level
= pers
->level
;
2271 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2273 mddev
->recovery
= 0;
2274 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
2275 mddev
->barriers_work
= 1;
2276 mddev
->ok_start_degraded
= start_dirty_degraded
;
2279 mddev
->ro
= 2; /* read-only, but switch on first write */
2281 err
= mddev
->pers
->run(mddev
);
2282 if (!err
&& mddev
->pers
->sync_request
) {
2283 err
= bitmap_create(mddev
);
2285 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
2286 mdname(mddev
), err
);
2287 mddev
->pers
->stop(mddev
);
2291 printk(KERN_ERR
"md: pers->run() failed ...\n");
2292 module_put(mddev
->pers
->owner
);
2294 bitmap_destroy(mddev
);
2297 if (mddev
->pers
->sync_request
)
2298 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
);
2299 else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
2302 atomic_set(&mddev
->writes_pending
,0);
2303 mddev
->safemode
= 0;
2304 mddev
->safemode_timer
.function
= md_safemode_timeout
;
2305 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
2306 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
2309 ITERATE_RDEV(mddev
,rdev
,tmp
)
2310 if (rdev
->raid_disk
>= 0) {
2312 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2313 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
2316 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2317 md_wakeup_thread(mddev
->thread
);
2319 if (mddev
->sb_dirty
)
2320 md_update_sb(mddev
);
2322 set_capacity(disk
, mddev
->array_size
<<1);
2324 /* If we call blk_queue_make_request here, it will
2325 * re-initialise max_sectors etc which may have been
2326 * refined inside -> run. So just set the bits we need to set.
2327 * Most initialisation happended when we called
2328 * blk_queue_make_request(..., md_fail_request)
2331 mddev
->queue
->queuedata
= mddev
;
2332 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
2335 md_new_event(mddev
);
2339 static int restart_array(mddev_t
*mddev
)
2341 struct gendisk
*disk
= mddev
->gendisk
;
2345 * Complain if it has no devices
2348 if (list_empty(&mddev
->disks
))
2356 mddev
->safemode
= 0;
2358 set_disk_ro(disk
, 0);
2360 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
2363 * Kick recovery or resync if necessary
2365 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2366 md_wakeup_thread(mddev
->thread
);
2369 printk(KERN_ERR
"md: %s has no personality assigned.\n",
2378 static int do_md_stop(mddev_t
* mddev
, int ro
)
2381 struct gendisk
*disk
= mddev
->gendisk
;
2384 if (atomic_read(&mddev
->active
)>2) {
2385 printk("md: %s still in use.\n",mdname(mddev
));
2389 if (mddev
->sync_thread
) {
2390 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2391 md_unregister_thread(mddev
->sync_thread
);
2392 mddev
->sync_thread
= NULL
;
2395 del_timer_sync(&mddev
->safemode_timer
);
2397 invalidate_partition(disk
, 0);
2405 bitmap_flush(mddev
);
2406 md_super_wait(mddev
);
2408 set_disk_ro(disk
, 0);
2409 blk_queue_make_request(mddev
->queue
, md_fail_request
);
2410 mddev
->pers
->stop(mddev
);
2411 if (mddev
->pers
->sync_request
)
2412 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
2414 module_put(mddev
->pers
->owner
);
2419 if (!mddev
->in_sync
) {
2420 /* mark array as shutdown cleanly */
2422 md_update_sb(mddev
);
2425 set_disk_ro(disk
, 1);
2428 bitmap_destroy(mddev
);
2429 if (mddev
->bitmap_file
) {
2430 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
2431 fput(mddev
->bitmap_file
);
2432 mddev
->bitmap_file
= NULL
;
2434 mddev
->bitmap_offset
= 0;
2437 * Free resources if final stop
2441 struct list_head
*tmp
;
2442 struct gendisk
*disk
;
2443 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
2445 ITERATE_RDEV(mddev
,rdev
,tmp
)
2446 if (rdev
->raid_disk
>= 0) {
2448 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2449 sysfs_remove_link(&mddev
->kobj
, nm
);
2452 export_array(mddev
);
2454 mddev
->array_size
= 0;
2455 disk
= mddev
->gendisk
;
2457 set_capacity(disk
, 0);
2460 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
2463 md_new_event(mddev
);
2468 static void autorun_array(mddev_t
*mddev
)
2471 struct list_head
*tmp
;
2474 if (list_empty(&mddev
->disks
))
2477 printk(KERN_INFO
"md: running: ");
2479 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2480 char b
[BDEVNAME_SIZE
];
2481 printk("<%s>", bdevname(rdev
->bdev
,b
));
2485 err
= do_md_run (mddev
);
2487 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
2488 do_md_stop (mddev
, 0);
2493 * lets try to run arrays based on all disks that have arrived
2494 * until now. (those are in pending_raid_disks)
2496 * the method: pick the first pending disk, collect all disks with
2497 * the same UUID, remove all from the pending list and put them into
2498 * the 'same_array' list. Then order this list based on superblock
2499 * update time (freshest comes first), kick out 'old' disks and
2500 * compare superblocks. If everything's fine then run it.
2502 * If "unit" is allocated, then bump its reference count
2504 static void autorun_devices(int part
)
2506 struct list_head candidates
;
2507 struct list_head
*tmp
;
2508 mdk_rdev_t
*rdev0
, *rdev
;
2510 char b
[BDEVNAME_SIZE
];
2512 printk(KERN_INFO
"md: autorun ...\n");
2513 while (!list_empty(&pending_raid_disks
)) {
2515 rdev0
= list_entry(pending_raid_disks
.next
,
2516 mdk_rdev_t
, same_set
);
2518 printk(KERN_INFO
"md: considering %s ...\n",
2519 bdevname(rdev0
->bdev
,b
));
2520 INIT_LIST_HEAD(&candidates
);
2521 ITERATE_RDEV_PENDING(rdev
,tmp
)
2522 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
2523 printk(KERN_INFO
"md: adding %s ...\n",
2524 bdevname(rdev
->bdev
,b
));
2525 list_move(&rdev
->same_set
, &candidates
);
2528 * now we have a set of devices, with all of them having
2529 * mostly sane superblocks. It's time to allocate the
2532 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
2533 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
2534 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
2538 dev
= MKDEV(mdp_major
,
2539 rdev0
->preferred_minor
<< MdpMinorShift
);
2541 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
2543 md_probe(dev
, NULL
, NULL
);
2544 mddev
= mddev_find(dev
);
2547 "md: cannot allocate memory for md drive.\n");
2550 if (mddev_lock(mddev
))
2551 printk(KERN_WARNING
"md: %s locked, cannot run\n",
2553 else if (mddev
->raid_disks
|| mddev
->major_version
2554 || !list_empty(&mddev
->disks
)) {
2556 "md: %s already running, cannot run %s\n",
2557 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
2558 mddev_unlock(mddev
);
2560 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
2561 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
2562 list_del_init(&rdev
->same_set
);
2563 if (bind_rdev_to_array(rdev
, mddev
))
2566 autorun_array(mddev
);
2567 mddev_unlock(mddev
);
2569 /* on success, candidates will be empty, on error
2572 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
2576 printk(KERN_INFO
"md: ... autorun DONE.\n");
2580 * import RAID devices based on one partition
2581 * if possible, the array gets run as well.
2584 static int autostart_array(dev_t startdev
)
2586 char b
[BDEVNAME_SIZE
];
2587 int err
= -EINVAL
, i
;
2588 mdp_super_t
*sb
= NULL
;
2589 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
2591 start_rdev
= md_import_device(startdev
, 0, 0);
2592 if (IS_ERR(start_rdev
))
2596 /* NOTE: this can only work for 0.90.0 superblocks */
2597 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
2598 if (sb
->major_version
!= 0 ||
2599 sb
->minor_version
!= 90 ) {
2600 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
2601 export_rdev(start_rdev
);
2605 if (test_bit(Faulty
, &start_rdev
->flags
)) {
2607 "md: can not autostart based on faulty %s!\n",
2608 bdevname(start_rdev
->bdev
,b
));
2609 export_rdev(start_rdev
);
2612 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
2614 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2615 mdp_disk_t
*desc
= sb
->disks
+ i
;
2616 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
2620 if (dev
== startdev
)
2622 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
2624 rdev
= md_import_device(dev
, 0, 0);
2628 list_add(&rdev
->same_set
, &pending_raid_disks
);
2632 * possibly return codes
2640 static int get_version(void __user
* arg
)
2644 ver
.major
= MD_MAJOR_VERSION
;
2645 ver
.minor
= MD_MINOR_VERSION
;
2646 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
2648 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
2654 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
2656 mdu_array_info_t info
;
2657 int nr
,working
,active
,failed
,spare
;
2659 struct list_head
*tmp
;
2661 nr
=working
=active
=failed
=spare
=0;
2662 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2664 if (test_bit(Faulty
, &rdev
->flags
))
2668 if (test_bit(In_sync
, &rdev
->flags
))
2675 info
.major_version
= mddev
->major_version
;
2676 info
.minor_version
= mddev
->minor_version
;
2677 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
2678 info
.ctime
= mddev
->ctime
;
2679 info
.level
= mddev
->level
;
2680 info
.size
= mddev
->size
;
2682 info
.raid_disks
= mddev
->raid_disks
;
2683 info
.md_minor
= mddev
->md_minor
;
2684 info
.not_persistent
= !mddev
->persistent
;
2686 info
.utime
= mddev
->utime
;
2689 info
.state
= (1<<MD_SB_CLEAN
);
2690 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
2691 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
2692 info
.active_disks
= active
;
2693 info
.working_disks
= working
;
2694 info
.failed_disks
= failed
;
2695 info
.spare_disks
= spare
;
2697 info
.layout
= mddev
->layout
;
2698 info
.chunk_size
= mddev
->chunk_size
;
2700 if (copy_to_user(arg
, &info
, sizeof(info
)))
2706 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
2708 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
2709 char *ptr
, *buf
= NULL
;
2712 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
2716 /* bitmap disabled, zero the first byte and copy out */
2717 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
2718 file
->pathname
[0] = '\0';
2722 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
2726 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
2730 strcpy(file
->pathname
, ptr
);
2734 if (copy_to_user(arg
, file
, sizeof(*file
)))
2742 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
2744 mdu_disk_info_t info
;
2748 if (copy_from_user(&info
, arg
, sizeof(info
)))
2753 rdev
= find_rdev_nr(mddev
, nr
);
2755 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
2756 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
2757 info
.raid_disk
= rdev
->raid_disk
;
2759 if (test_bit(Faulty
, &rdev
->flags
))
2760 info
.state
|= (1<<MD_DISK_FAULTY
);
2761 else if (test_bit(In_sync
, &rdev
->flags
)) {
2762 info
.state
|= (1<<MD_DISK_ACTIVE
);
2763 info
.state
|= (1<<MD_DISK_SYNC
);
2765 if (test_bit(WriteMostly
, &rdev
->flags
))
2766 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
2768 info
.major
= info
.minor
= 0;
2769 info
.raid_disk
= -1;
2770 info
.state
= (1<<MD_DISK_REMOVED
);
2773 if (copy_to_user(arg
, &info
, sizeof(info
)))
2779 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
2781 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
2783 dev_t dev
= MKDEV(info
->major
,info
->minor
);
2785 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
2788 if (!mddev
->raid_disks
) {
2790 /* expecting a device which has a superblock */
2791 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
2794 "md: md_import_device returned %ld\n",
2796 return PTR_ERR(rdev
);
2798 if (!list_empty(&mddev
->disks
)) {
2799 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2800 mdk_rdev_t
, same_set
);
2801 int err
= super_types
[mddev
->major_version
]
2802 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2805 "md: %s has different UUID to %s\n",
2806 bdevname(rdev
->bdev
,b
),
2807 bdevname(rdev0
->bdev
,b2
));
2812 err
= bind_rdev_to_array(rdev
, mddev
);
2819 * add_new_disk can be used once the array is assembled
2820 * to add "hot spares". They must already have a superblock
2825 if (!mddev
->pers
->hot_add_disk
) {
2827 "%s: personality does not support diskops!\n",
2831 if (mddev
->persistent
)
2832 rdev
= md_import_device(dev
, mddev
->major_version
,
2833 mddev
->minor_version
);
2835 rdev
= md_import_device(dev
, -1, -1);
2838 "md: md_import_device returned %ld\n",
2840 return PTR_ERR(rdev
);
2842 /* set save_raid_disk if appropriate */
2843 if (!mddev
->persistent
) {
2844 if (info
->state
& (1<<MD_DISK_SYNC
) &&
2845 info
->raid_disk
< mddev
->raid_disks
)
2846 rdev
->raid_disk
= info
->raid_disk
;
2848 rdev
->raid_disk
= -1;
2850 super_types
[mddev
->major_version
].
2851 validate_super(mddev
, rdev
);
2852 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2854 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
2855 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2856 set_bit(WriteMostly
, &rdev
->flags
);
2858 rdev
->raid_disk
= -1;
2859 err
= bind_rdev_to_array(rdev
, mddev
);
2863 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2864 md_wakeup_thread(mddev
->thread
);
2868 /* otherwise, add_new_disk is only allowed
2869 * for major_version==0 superblocks
2871 if (mddev
->major_version
!= 0) {
2872 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
2877 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
2879 rdev
= md_import_device (dev
, -1, 0);
2882 "md: error, md_import_device() returned %ld\n",
2884 return PTR_ERR(rdev
);
2886 rdev
->desc_nr
= info
->number
;
2887 if (info
->raid_disk
< mddev
->raid_disks
)
2888 rdev
->raid_disk
= info
->raid_disk
;
2890 rdev
->raid_disk
= -1;
2894 if (rdev
->raid_disk
< mddev
->raid_disks
)
2895 if (info
->state
& (1<<MD_DISK_SYNC
))
2896 set_bit(In_sync
, &rdev
->flags
);
2898 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
2899 set_bit(WriteMostly
, &rdev
->flags
);
2901 err
= bind_rdev_to_array(rdev
, mddev
);
2907 if (!mddev
->persistent
) {
2908 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
2909 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2911 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2912 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2914 if (!mddev
->size
|| (mddev
->size
> rdev
->size
))
2915 mddev
->size
= rdev
->size
;
2921 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
2923 char b
[BDEVNAME_SIZE
];
2929 rdev
= find_rdev(mddev
, dev
);
2933 if (rdev
->raid_disk
>= 0)
2936 kick_rdev_from_array(rdev
);
2937 md_update_sb(mddev
);
2938 md_new_event(mddev
);
2942 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
2943 bdevname(rdev
->bdev
,b
), mdname(mddev
));
2947 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
2949 char b
[BDEVNAME_SIZE
];
2957 if (mddev
->major_version
!= 0) {
2958 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
2959 " version-0 superblocks.\n",
2963 if (!mddev
->pers
->hot_add_disk
) {
2965 "%s: personality does not support diskops!\n",
2970 rdev
= md_import_device (dev
, -1, 0);
2973 "md: error, md_import_device() returned %ld\n",
2978 if (mddev
->persistent
)
2979 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
2982 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2984 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
2987 if (size
< mddev
->size
) {
2989 "%s: disk size %llu blocks < array size %llu\n",
2990 mdname(mddev
), (unsigned long long)size
,
2991 (unsigned long long)mddev
->size
);
2996 if (test_bit(Faulty
, &rdev
->flags
)) {
2998 "md: can not hot-add faulty %s disk to %s!\n",
2999 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3003 clear_bit(In_sync
, &rdev
->flags
);
3005 bind_rdev_to_array(rdev
, mddev
);
3008 * The rest should better be atomic, we can have disk failures
3009 * noticed in interrupt contexts ...
3012 if (rdev
->desc_nr
== mddev
->max_disks
) {
3013 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
3016 goto abort_unbind_export
;
3019 rdev
->raid_disk
= -1;
3021 md_update_sb(mddev
);
3024 * Kick recovery, maybe this spare has to be added to the
3025 * array immediately.
3027 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3028 md_wakeup_thread(mddev
->thread
);
3029 md_new_event(mddev
);
3032 abort_unbind_export
:
3033 unbind_rdev_from_array(rdev
);
3040 /* similar to deny_write_access, but accounts for our holding a reference
3041 * to the file ourselves */
3042 static int deny_bitmap_write_access(struct file
* file
)
3044 struct inode
*inode
= file
->f_mapping
->host
;
3046 spin_lock(&inode
->i_lock
);
3047 if (atomic_read(&inode
->i_writecount
) > 1) {
3048 spin_unlock(&inode
->i_lock
);
3051 atomic_set(&inode
->i_writecount
, -1);
3052 spin_unlock(&inode
->i_lock
);
3057 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
3062 if (!mddev
->pers
->quiesce
)
3064 if (mddev
->recovery
|| mddev
->sync_thread
)
3066 /* we should be able to change the bitmap.. */
3072 return -EEXIST
; /* cannot add when bitmap is present */
3073 mddev
->bitmap_file
= fget(fd
);
3075 if (mddev
->bitmap_file
== NULL
) {
3076 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
3081 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
3083 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
3085 fput(mddev
->bitmap_file
);
3086 mddev
->bitmap_file
= NULL
;
3089 mddev
->bitmap_offset
= 0; /* file overrides offset */
3090 } else if (mddev
->bitmap
== NULL
)
3091 return -ENOENT
; /* cannot remove what isn't there */
3094 mddev
->pers
->quiesce(mddev
, 1);
3096 err
= bitmap_create(mddev
);
3098 bitmap_destroy(mddev
);
3099 mddev
->pers
->quiesce(mddev
, 0);
3100 } else if (fd
< 0) {
3101 if (mddev
->bitmap_file
)
3102 fput(mddev
->bitmap_file
);
3103 mddev
->bitmap_file
= NULL
;
3110 * set_array_info is used two different ways
3111 * The original usage is when creating a new array.
3112 * In this usage, raid_disks is > 0 and it together with
3113 * level, size, not_persistent,layout,chunksize determine the
3114 * shape of the array.
3115 * This will always create an array with a type-0.90.0 superblock.
3116 * The newer usage is when assembling an array.
3117 * In this case raid_disks will be 0, and the major_version field is
3118 * use to determine which style super-blocks are to be found on the devices.
3119 * The minor and patch _version numbers are also kept incase the
3120 * super_block handler wishes to interpret them.
3122 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
3125 if (info
->raid_disks
== 0) {
3126 /* just setting version number for superblock loading */
3127 if (info
->major_version
< 0 ||
3128 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
3129 super_types
[info
->major_version
].name
== NULL
) {
3130 /* maybe try to auto-load a module? */
3132 "md: superblock version %d not known\n",
3133 info
->major_version
);
3136 mddev
->major_version
= info
->major_version
;
3137 mddev
->minor_version
= info
->minor_version
;
3138 mddev
->patch_version
= info
->patch_version
;
3141 mddev
->major_version
= MD_MAJOR_VERSION
;
3142 mddev
->minor_version
= MD_MINOR_VERSION
;
3143 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
3144 mddev
->ctime
= get_seconds();
3146 mddev
->level
= info
->level
;
3147 mddev
->size
= info
->size
;
3148 mddev
->raid_disks
= info
->raid_disks
;
3149 /* don't set md_minor, it is determined by which /dev/md* was
3152 if (info
->state
& (1<<MD_SB_CLEAN
))
3153 mddev
->recovery_cp
= MaxSector
;
3155 mddev
->recovery_cp
= 0;
3156 mddev
->persistent
= ! info
->not_persistent
;
3158 mddev
->layout
= info
->layout
;
3159 mddev
->chunk_size
= info
->chunk_size
;
3161 mddev
->max_disks
= MD_SB_DISKS
;
3163 mddev
->sb_dirty
= 1;
3165 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
3166 mddev
->bitmap_offset
= 0;
3169 * Generate a 128 bit UUID
3171 get_random_bytes(mddev
->uuid
, 16);
3176 static int update_size(mddev_t
*mddev
, unsigned long size
)
3180 struct list_head
*tmp
;
3182 if (mddev
->pers
->resize
== NULL
)
3184 /* The "size" is the amount of each device that is used.
3185 * This can only make sense for arrays with redundancy.
3186 * linear and raid0 always use whatever space is available
3187 * We can only consider changing the size if no resync
3188 * or reconstruction is happening, and if the new size
3189 * is acceptable. It must fit before the sb_offset or,
3190 * if that is <data_offset, it must fit before the
3191 * size of each device.
3192 * If size is zero, we find the largest size that fits.
3194 if (mddev
->sync_thread
)
3196 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3198 int fit
= (size
== 0);
3199 if (rdev
->sb_offset
> rdev
->data_offset
)
3200 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
3202 avail
= get_capacity(rdev
->bdev
->bd_disk
)
3203 - rdev
->data_offset
;
3204 if (fit
&& (size
== 0 || size
> avail
/2))
3206 if (avail
< ((sector_t
)size
<< 1))
3209 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
3211 struct block_device
*bdev
;
3213 bdev
= bdget_disk(mddev
->gendisk
, 0);
3215 down(&bdev
->bd_inode
->i_sem
);
3216 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
3217 up(&bdev
->bd_inode
->i_sem
);
3224 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
3227 /* change the number of raid disks */
3228 if (mddev
->pers
->reshape
== NULL
)
3230 if (raid_disks
<= 0 ||
3231 raid_disks
>= mddev
->max_disks
)
3233 if (mddev
->sync_thread
)
3235 rv
= mddev
->pers
->reshape(mddev
, raid_disks
);
3237 struct block_device
*bdev
;
3239 bdev
= bdget_disk(mddev
->gendisk
, 0);
3241 down(&bdev
->bd_inode
->i_sem
);
3242 i_size_write(bdev
->bd_inode
, mddev
->array_size
<< 10);
3243 up(&bdev
->bd_inode
->i_sem
);
3252 * update_array_info is used to change the configuration of an
3254 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3255 * fields in the info are checked against the array.
3256 * Any differences that cannot be handled will cause an error.
3257 * Normally, only one change can be managed at a time.
3259 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
3265 /* calculate expected state,ignoring low bits */
3266 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3267 state
|= (1 << MD_SB_BITMAP_PRESENT
);
3269 if (mddev
->major_version
!= info
->major_version
||
3270 mddev
->minor_version
!= info
->minor_version
||
3271 /* mddev->patch_version != info->patch_version || */
3272 mddev
->ctime
!= info
->ctime
||
3273 mddev
->level
!= info
->level
||
3274 /* mddev->layout != info->layout || */
3275 !mddev
->persistent
!= info
->not_persistent
||
3276 mddev
->chunk_size
!= info
->chunk_size
||
3277 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3278 ((state
^info
->state
) & 0xfffffe00)
3281 /* Check there is only one change */
3282 if (mddev
->size
!= info
->size
) cnt
++;
3283 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
3284 if (mddev
->layout
!= info
->layout
) cnt
++;
3285 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
3286 if (cnt
== 0) return 0;
3287 if (cnt
> 1) return -EINVAL
;
3289 if (mddev
->layout
!= info
->layout
) {
3291 * we don't need to do anything at the md level, the
3292 * personality will take care of it all.
3294 if (mddev
->pers
->reconfig
== NULL
)
3297 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
3299 if (mddev
->size
!= info
->size
)
3300 rv
= update_size(mddev
, info
->size
);
3302 if (mddev
->raid_disks
!= info
->raid_disks
)
3303 rv
= update_raid_disks(mddev
, info
->raid_disks
);
3305 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
3306 if (mddev
->pers
->quiesce
== NULL
)
3308 if (mddev
->recovery
|| mddev
->sync_thread
)
3310 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
3311 /* add the bitmap */
3314 if (mddev
->default_bitmap_offset
== 0)
3316 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
3317 mddev
->pers
->quiesce(mddev
, 1);
3318 rv
= bitmap_create(mddev
);
3320 bitmap_destroy(mddev
);
3321 mddev
->pers
->quiesce(mddev
, 0);
3323 /* remove the bitmap */
3326 if (mddev
->bitmap
->file
)
3328 mddev
->pers
->quiesce(mddev
, 1);
3329 bitmap_destroy(mddev
);
3330 mddev
->pers
->quiesce(mddev
, 0);
3331 mddev
->bitmap_offset
= 0;
3334 md_update_sb(mddev
);
3338 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
3342 if (mddev
->pers
== NULL
)
3345 rdev
= find_rdev(mddev
, dev
);
3349 md_error(mddev
, rdev
);
3353 static int md_ioctl(struct inode
*inode
, struct file
*file
,
3354 unsigned int cmd
, unsigned long arg
)
3357 void __user
*argp
= (void __user
*)arg
;
3358 struct hd_geometry __user
*loc
= argp
;
3359 mddev_t
*mddev
= NULL
;
3361 if (!capable(CAP_SYS_ADMIN
))
3365 * Commands dealing with the RAID driver but not any
3371 err
= get_version(argp
);
3374 case PRINT_RAID_DEBUG
:
3382 autostart_arrays(arg
);
3389 * Commands creating/starting a new array:
3392 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3400 if (cmd
== START_ARRAY
) {
3401 /* START_ARRAY doesn't need to lock the array as autostart_array
3402 * does the locking, and it could even be a different array
3407 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3408 "This will not be supported beyond July 2006\n",
3409 current
->comm
, current
->pid
);
3412 err
= autostart_array(new_decode_dev(arg
));
3414 printk(KERN_WARNING
"md: autostart failed!\n");
3420 err
= mddev_lock(mddev
);
3423 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3430 case SET_ARRAY_INFO
:
3432 mdu_array_info_t info
;
3434 memset(&info
, 0, sizeof(info
));
3435 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
3440 err
= update_array_info(mddev
, &info
);
3442 printk(KERN_WARNING
"md: couldn't update"
3443 " array info. %d\n", err
);
3448 if (!list_empty(&mddev
->disks
)) {
3450 "md: array %s already has disks!\n",
3455 if (mddev
->raid_disks
) {
3457 "md: array %s already initialised!\n",
3462 err
= set_array_info(mddev
, &info
);
3464 printk(KERN_WARNING
"md: couldn't set"
3465 " array info. %d\n", err
);
3475 * Commands querying/configuring an existing array:
3477 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3478 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3479 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
3480 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
3486 * Commands even a read-only array can execute:
3490 case GET_ARRAY_INFO
:
3491 err
= get_array_info(mddev
, argp
);
3494 case GET_BITMAP_FILE
:
3495 err
= get_bitmap_file(mddev
, argp
);
3499 err
= get_disk_info(mddev
, argp
);
3502 case RESTART_ARRAY_RW
:
3503 err
= restart_array(mddev
);
3507 err
= do_md_stop (mddev
, 0);
3511 err
= do_md_stop (mddev
, 1);
3515 * We have a problem here : there is no easy way to give a CHS
3516 * virtual geometry. We currently pretend that we have a 2 heads
3517 * 4 sectors (with a BIG number of cylinders...). This drives
3518 * dosfs just mad... ;-)
3525 err
= put_user (2, (char __user
*) &loc
->heads
);
3528 err
= put_user (4, (char __user
*) &loc
->sectors
);
3531 err
= put_user(get_capacity(mddev
->gendisk
)/8,
3532 (short __user
*) &loc
->cylinders
);
3535 err
= put_user (get_start_sect(inode
->i_bdev
),
3536 (long __user
*) &loc
->start
);
3541 * The remaining ioctls are changing the state of the
3542 * superblock, so we do not allow them on read-only arrays.
3543 * However non-MD ioctls (e.g. get-size) will still come through
3544 * here and hit the 'default' below, so only disallow
3545 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3547 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
3548 mddev
->ro
&& mddev
->pers
) {
3549 if (mddev
->ro
== 2) {
3551 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3552 md_wakeup_thread(mddev
->thread
);
3564 mdu_disk_info_t info
;
3565 if (copy_from_user(&info
, argp
, sizeof(info
)))
3568 err
= add_new_disk(mddev
, &info
);
3572 case HOT_REMOVE_DISK
:
3573 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
3577 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
3580 case SET_DISK_FAULTY
:
3581 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
3585 err
= do_md_run (mddev
);
3588 case SET_BITMAP_FILE
:
3589 err
= set_bitmap_file(mddev
, (int)arg
);
3593 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
3594 printk(KERN_WARNING
"md: %s(pid %d) used"
3595 " obsolete MD ioctl, upgrade your"
3596 " software to use new ictls.\n",
3597 current
->comm
, current
->pid
);
3604 mddev_unlock(mddev
);
3614 static int md_open(struct inode
*inode
, struct file
*file
)
3617 * Succeed if we can lock the mddev, which confirms that
3618 * it isn't being stopped right now.
3620 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3623 if ((err
= mddev_lock(mddev
)))
3628 mddev_unlock(mddev
);
3630 check_disk_change(inode
->i_bdev
);
3635 static int md_release(struct inode
*inode
, struct file
* file
)
3637 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3646 static int md_media_changed(struct gendisk
*disk
)
3648 mddev_t
*mddev
= disk
->private_data
;
3650 return mddev
->changed
;
3653 static int md_revalidate(struct gendisk
*disk
)
3655 mddev_t
*mddev
= disk
->private_data
;
3660 static struct block_device_operations md_fops
=
3662 .owner
= THIS_MODULE
,
3664 .release
= md_release
,
3666 .media_changed
= md_media_changed
,
3667 .revalidate_disk
= md_revalidate
,
3670 static int md_thread(void * arg
)
3672 mdk_thread_t
*thread
= arg
;
3675 * md_thread is a 'system-thread', it's priority should be very
3676 * high. We avoid resource deadlocks individually in each
3677 * raid personality. (RAID5 does preallocation) We also use RR and
3678 * the very same RT priority as kswapd, thus we will never get
3679 * into a priority inversion deadlock.
3681 * we definitely have to have equal or higher priority than
3682 * bdflush, otherwise bdflush will deadlock if there are too
3683 * many dirty RAID5 blocks.
3686 allow_signal(SIGKILL
);
3687 while (!kthread_should_stop()) {
3689 /* We need to wait INTERRUPTIBLE so that
3690 * we don't add to the load-average.
3691 * That means we need to be sure no signals are
3694 if (signal_pending(current
))
3695 flush_signals(current
);
3697 wait_event_interruptible_timeout
3699 test_bit(THREAD_WAKEUP
, &thread
->flags
)
3700 || kthread_should_stop(),
3704 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
3706 thread
->run(thread
->mddev
);
3712 void md_wakeup_thread(mdk_thread_t
*thread
)
3715 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
3716 set_bit(THREAD_WAKEUP
, &thread
->flags
);
3717 wake_up(&thread
->wqueue
);
3721 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
3724 mdk_thread_t
*thread
;
3726 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
3730 init_waitqueue_head(&thread
->wqueue
);
3733 thread
->mddev
= mddev
;
3734 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
3735 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
3736 if (IS_ERR(thread
->tsk
)) {
3743 void md_unregister_thread(mdk_thread_t
*thread
)
3745 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
3747 kthread_stop(thread
->tsk
);
3751 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
3758 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
3761 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3763 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3764 __builtin_return_address(0),__builtin_return_address(1),
3765 __builtin_return_address(2),__builtin_return_address(3));
3767 if (!mddev
->pers
->error_handler
)
3769 mddev
->pers
->error_handler(mddev
,rdev
);
3770 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3771 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3772 md_wakeup_thread(mddev
->thread
);
3773 md_new_event(mddev
);
3776 /* seq_file implementation /proc/mdstat */
3778 static void status_unused(struct seq_file
*seq
)
3782 struct list_head
*tmp
;
3784 seq_printf(seq
, "unused devices: ");
3786 ITERATE_RDEV_PENDING(rdev
,tmp
) {
3787 char b
[BDEVNAME_SIZE
];
3789 seq_printf(seq
, "%s ",
3790 bdevname(rdev
->bdev
,b
));
3793 seq_printf(seq
, "<none>");
3795 seq_printf(seq
, "\n");
3799 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
3801 unsigned long max_blocks
, resync
, res
, dt
, db
, rt
;
3803 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
3805 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3806 max_blocks
= mddev
->resync_max_sectors
>> 1;
3808 max_blocks
= mddev
->size
;
3811 * Should not happen.
3817 res
= (resync
/1024)*1000/(max_blocks
/1024 + 1);
3819 int i
, x
= res
/50, y
= 20-x
;
3820 seq_printf(seq
, "[");
3821 for (i
= 0; i
< x
; i
++)
3822 seq_printf(seq
, "=");
3823 seq_printf(seq
, ">");
3824 for (i
= 0; i
< y
; i
++)
3825 seq_printf(seq
, ".");
3826 seq_printf(seq
, "] ");
3828 seq_printf(seq
, " %s =%3lu.%lu%% (%lu/%lu)",
3829 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
3830 "resync" : "recovery"),
3831 res
/10, res
% 10, resync
, max_blocks
);
3834 * We do not want to overflow, so the order of operands and
3835 * the * 100 / 100 trick are important. We do a +1 to be
3836 * safe against division by zero. We only estimate anyway.
3838 * dt: time from mark until now
3839 * db: blocks written from mark until now
3840 * rt: remaining time
3842 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
3844 db
= resync
- (mddev
->resync_mark_cnt
/2);
3845 rt
= (dt
* ((max_blocks
-resync
) / (db
/100+1)))/100;
3847 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
3849 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
3852 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3854 struct list_head
*tmp
;
3864 spin_lock(&all_mddevs_lock
);
3865 list_for_each(tmp
,&all_mddevs
)
3867 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
3869 spin_unlock(&all_mddevs_lock
);
3872 spin_unlock(&all_mddevs_lock
);
3874 return (void*)2;/* tail */
3878 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3880 struct list_head
*tmp
;
3881 mddev_t
*next_mddev
, *mddev
= v
;
3887 spin_lock(&all_mddevs_lock
);
3889 tmp
= all_mddevs
.next
;
3891 tmp
= mddev
->all_mddevs
.next
;
3892 if (tmp
!= &all_mddevs
)
3893 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
3895 next_mddev
= (void*)2;
3898 spin_unlock(&all_mddevs_lock
);
3906 static void md_seq_stop(struct seq_file
*seq
, void *v
)
3910 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
3914 struct mdstat_info
{
3918 static int md_seq_show(struct seq_file
*seq
, void *v
)
3922 struct list_head
*tmp2
;
3924 struct mdstat_info
*mi
= seq
->private;
3925 struct bitmap
*bitmap
;
3927 if (v
== (void*)1) {
3928 struct mdk_personality
*pers
;
3929 seq_printf(seq
, "Personalities : ");
3930 spin_lock(&pers_lock
);
3931 list_for_each_entry(pers
, &pers_list
, list
)
3932 seq_printf(seq
, "[%s] ", pers
->name
);
3934 spin_unlock(&pers_lock
);
3935 seq_printf(seq
, "\n");
3936 mi
->event
= atomic_read(&md_event_count
);
3939 if (v
== (void*)2) {
3944 if (mddev_lock(mddev
)!=0)
3946 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
3947 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
3948 mddev
->pers
? "" : "in");
3951 seq_printf(seq
, " (read-only)");
3953 seq_printf(seq
, "(auto-read-only)");
3954 seq_printf(seq
, " %s", mddev
->pers
->name
);
3958 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
3959 char b
[BDEVNAME_SIZE
];
3960 seq_printf(seq
, " %s[%d]",
3961 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
3962 if (test_bit(WriteMostly
, &rdev
->flags
))
3963 seq_printf(seq
, "(W)");
3964 if (test_bit(Faulty
, &rdev
->flags
)) {
3965 seq_printf(seq
, "(F)");
3967 } else if (rdev
->raid_disk
< 0)
3968 seq_printf(seq
, "(S)"); /* spare */
3972 if (!list_empty(&mddev
->disks
)) {
3974 seq_printf(seq
, "\n %llu blocks",
3975 (unsigned long long)mddev
->array_size
);
3977 seq_printf(seq
, "\n %llu blocks",
3978 (unsigned long long)size
);
3980 if (mddev
->persistent
) {
3981 if (mddev
->major_version
!= 0 ||
3982 mddev
->minor_version
!= 90) {
3983 seq_printf(seq
," super %d.%d",
3984 mddev
->major_version
,
3985 mddev
->minor_version
);
3988 seq_printf(seq
, " super non-persistent");
3991 mddev
->pers
->status (seq
, mddev
);
3992 seq_printf(seq
, "\n ");
3993 if (mddev
->pers
->sync_request
) {
3994 if (mddev
->curr_resync
> 2) {
3995 status_resync (seq
, mddev
);
3996 seq_printf(seq
, "\n ");
3997 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
3998 seq_printf(seq
, "\tresync=DELAYED\n ");
3999 else if (mddev
->recovery_cp
< MaxSector
)
4000 seq_printf(seq
, "\tresync=PENDING\n ");
4003 seq_printf(seq
, "\n ");
4005 if ((bitmap
= mddev
->bitmap
)) {
4006 unsigned long chunk_kb
;
4007 unsigned long flags
;
4008 spin_lock_irqsave(&bitmap
->lock
, flags
);
4009 chunk_kb
= bitmap
->chunksize
>> 10;
4010 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4012 bitmap
->pages
- bitmap
->missing_pages
,
4014 (bitmap
->pages
- bitmap
->missing_pages
)
4015 << (PAGE_SHIFT
- 10),
4016 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
4017 chunk_kb
? "KB" : "B");
4019 seq_printf(seq
, ", file: ");
4020 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
4021 bitmap
->file
->f_dentry
," \t\n");
4024 seq_printf(seq
, "\n");
4025 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
4028 seq_printf(seq
, "\n");
4030 mddev_unlock(mddev
);
4035 static struct seq_operations md_seq_ops
= {
4036 .start
= md_seq_start
,
4037 .next
= md_seq_next
,
4038 .stop
= md_seq_stop
,
4039 .show
= md_seq_show
,
4042 static int md_seq_open(struct inode
*inode
, struct file
*file
)
4045 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
4049 error
= seq_open(file
, &md_seq_ops
);
4053 struct seq_file
*p
= file
->private_data
;
4055 mi
->event
= atomic_read(&md_event_count
);
4060 static int md_seq_release(struct inode
*inode
, struct file
*file
)
4062 struct seq_file
*m
= file
->private_data
;
4063 struct mdstat_info
*mi
= m
->private;
4066 return seq_release(inode
, file
);
4069 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
4071 struct seq_file
*m
= filp
->private_data
;
4072 struct mdstat_info
*mi
= m
->private;
4075 poll_wait(filp
, &md_event_waiters
, wait
);
4077 /* always allow read */
4078 mask
= POLLIN
| POLLRDNORM
;
4080 if (mi
->event
!= atomic_read(&md_event_count
))
4081 mask
|= POLLERR
| POLLPRI
;
4085 static struct file_operations md_seq_fops
= {
4086 .open
= md_seq_open
,
4088 .llseek
= seq_lseek
,
4089 .release
= md_seq_release
,
4090 .poll
= mdstat_poll
,
4093 int register_md_personality(struct mdk_personality
*p
)
4095 spin_lock(&pers_lock
);
4096 list_add_tail(&p
->list
, &pers_list
);
4097 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
4098 spin_unlock(&pers_lock
);
4102 int unregister_md_personality(struct mdk_personality
*p
)
4104 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
4105 spin_lock(&pers_lock
);
4106 list_del_init(&p
->list
);
4107 spin_unlock(&pers_lock
);
4111 static int is_mddev_idle(mddev_t
*mddev
)
4114 struct list_head
*tmp
;
4116 unsigned long curr_events
;
4119 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4120 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
4121 curr_events
= disk_stat_read(disk
, sectors
[0]) +
4122 disk_stat_read(disk
, sectors
[1]) -
4123 atomic_read(&disk
->sync_io
);
4124 /* The difference between curr_events and last_events
4125 * will be affected by any new non-sync IO (making
4126 * curr_events bigger) and any difference in the amount of
4127 * in-flight syncio (making current_events bigger or smaller)
4128 * The amount in-flight is currently limited to
4129 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4130 * which is at most 4096 sectors.
4131 * These numbers are fairly fragile and should be made
4132 * more robust, probably by enforcing the
4133 * 'window size' that md_do_sync sort-of uses.
4135 * Note: the following is an unsigned comparison.
4137 if ((curr_events
- rdev
->last_events
+ 4096) > 8192) {
4138 rdev
->last_events
= curr_events
;
4145 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
4147 /* another "blocks" (512byte) blocks have been synced */
4148 atomic_sub(blocks
, &mddev
->recovery_active
);
4149 wake_up(&mddev
->recovery_wait
);
4151 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4152 md_wakeup_thread(mddev
->thread
);
4153 // stop recovery, signal do_sync ....
4158 /* md_write_start(mddev, bi)
4159 * If we need to update some array metadata (e.g. 'active' flag
4160 * in superblock) before writing, schedule a superblock update
4161 * and wait for it to complete.
4163 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
4165 if (bio_data_dir(bi
) != WRITE
)
4168 BUG_ON(mddev
->ro
== 1);
4169 if (mddev
->ro
== 2) {
4170 /* need to switch to read/write */
4172 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4173 md_wakeup_thread(mddev
->thread
);
4175 atomic_inc(&mddev
->writes_pending
);
4176 if (mddev
->in_sync
) {
4177 spin_lock_irq(&mddev
->write_lock
);
4178 if (mddev
->in_sync
) {
4180 mddev
->sb_dirty
= 1;
4181 md_wakeup_thread(mddev
->thread
);
4183 spin_unlock_irq(&mddev
->write_lock
);
4185 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
4188 void md_write_end(mddev_t
*mddev
)
4190 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
4191 if (mddev
->safemode
== 2)
4192 md_wakeup_thread(mddev
->thread
);
4194 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
4198 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
4200 #define SYNC_MARKS 10
4201 #define SYNC_MARK_STEP (3*HZ)
4202 static void md_do_sync(mddev_t
*mddev
)
4205 unsigned int currspeed
= 0,
4207 sector_t max_sectors
,j
, io_sectors
;
4208 unsigned long mark
[SYNC_MARKS
];
4209 sector_t mark_cnt
[SYNC_MARKS
];
4211 struct list_head
*tmp
;
4212 sector_t last_check
;
4215 /* just incase thread restarts... */
4216 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
4219 /* we overload curr_resync somewhat here.
4220 * 0 == not engaged in resync at all
4221 * 2 == checking that there is no conflict with another sync
4222 * 1 == like 2, but have yielded to allow conflicting resync to
4224 * other == active in resync - this many blocks
4226 * Before starting a resync we must have set curr_resync to
4227 * 2, and then checked that every "conflicting" array has curr_resync
4228 * less than ours. When we find one that is the same or higher
4229 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4230 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4231 * This will mean we have to start checking from the beginning again.
4236 mddev
->curr_resync
= 2;
4239 if (kthread_should_stop()) {
4240 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4243 ITERATE_MDDEV(mddev2
,tmp
) {
4244 if (mddev2
== mddev
)
4246 if (mddev2
->curr_resync
&&
4247 match_mddev_units(mddev
,mddev2
)) {
4249 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
4250 /* arbitrarily yield */
4251 mddev
->curr_resync
= 1;
4252 wake_up(&resync_wait
);
4254 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
4255 /* no need to wait here, we can wait the next
4256 * time 'round when curr_resync == 2
4259 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
4260 if (!kthread_should_stop() &&
4261 mddev2
->curr_resync
>= mddev
->curr_resync
) {
4262 printk(KERN_INFO
"md: delaying resync of %s"
4263 " until %s has finished resync (they"
4264 " share one or more physical units)\n",
4265 mdname(mddev
), mdname(mddev2
));
4268 finish_wait(&resync_wait
, &wq
);
4271 finish_wait(&resync_wait
, &wq
);
4274 } while (mddev
->curr_resync
< 2);
4276 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4277 /* resync follows the size requested by the personality,
4278 * which defaults to physical size, but can be virtual size
4280 max_sectors
= mddev
->resync_max_sectors
;
4281 mddev
->resync_mismatches
= 0;
4283 /* recovery follows the physical size of devices */
4284 max_sectors
= mddev
->size
<< 1;
4286 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
4287 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
4288 " %d KB/sec/disc.\n", sysctl_speed_limit_min
);
4289 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
4290 "(but not more than %d KB/sec) for reconstruction.\n",
4291 sysctl_speed_limit_max
);
4293 is_mddev_idle(mddev
); /* this also initializes IO event counters */
4294 /* we don't use the checkpoint if there's a bitmap */
4295 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
4296 && ! test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4297 j
= mddev
->recovery_cp
;
4301 for (m
= 0; m
< SYNC_MARKS
; m
++) {
4303 mark_cnt
[m
] = io_sectors
;
4306 mddev
->resync_mark
= mark
[last_mark
];
4307 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
4310 * Tune reconstruction:
4312 window
= 32*(PAGE_SIZE
/512);
4313 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
4314 window
/2,(unsigned long long) max_sectors
/2);
4316 atomic_set(&mddev
->recovery_active
, 0);
4317 init_waitqueue_head(&mddev
->recovery_wait
);
4322 "md: resuming recovery of %s from checkpoint.\n",
4324 mddev
->curr_resync
= j
;
4327 while (j
< max_sectors
) {
4331 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
4332 currspeed
< sysctl_speed_limit_min
);
4334 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4338 if (!skipped
) { /* actual IO requested */
4339 io_sectors
+= sectors
;
4340 atomic_add(sectors
, &mddev
->recovery_active
);
4344 if (j
>1) mddev
->curr_resync
= j
;
4345 if (last_check
== 0)
4346 /* this is the earliers that rebuilt will be
4347 * visible in /proc/mdstat
4349 md_new_event(mddev
);
4351 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
4354 last_check
= io_sectors
;
4356 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
4357 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
4361 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
4363 int next
= (last_mark
+1) % SYNC_MARKS
;
4365 mddev
->resync_mark
= mark
[next
];
4366 mddev
->resync_mark_cnt
= mark_cnt
[next
];
4367 mark
[next
] = jiffies
;
4368 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
4373 if (kthread_should_stop()) {
4375 * got a signal, exit.
4378 "md: md_do_sync() got signal ... exiting\n");
4379 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4384 * this loop exits only if either when we are slower than
4385 * the 'hard' speed limit, or the system was IO-idle for
4387 * the system might be non-idle CPU-wise, but we only care
4388 * about not overloading the IO subsystem. (things like an
4389 * e2fsck being done on the RAID array should execute fast)
4391 mddev
->queue
->unplug_fn(mddev
->queue
);
4394 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
4395 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
4397 if (currspeed
> sysctl_speed_limit_min
) {
4398 if ((currspeed
> sysctl_speed_limit_max
) ||
4399 !is_mddev_idle(mddev
)) {
4405 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
4407 * this also signals 'finished resyncing' to md_stop
4410 mddev
->queue
->unplug_fn(mddev
->queue
);
4412 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
4414 /* tell personality that we are finished */
4415 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
4417 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4418 mddev
->curr_resync
> 2 &&
4419 mddev
->curr_resync
>= mddev
->recovery_cp
) {
4420 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4422 "md: checkpointing recovery of %s.\n",
4424 mddev
->recovery_cp
= mddev
->curr_resync
;
4426 mddev
->recovery_cp
= MaxSector
;
4430 mddev
->curr_resync
= 0;
4431 wake_up(&resync_wait
);
4432 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4433 md_wakeup_thread(mddev
->thread
);
4438 * This routine is regularly called by all per-raid-array threads to
4439 * deal with generic issues like resync and super-block update.
4440 * Raid personalities that don't have a thread (linear/raid0) do not
4441 * need this as they never do any recovery or update the superblock.
4443 * It does not do any resync itself, but rather "forks" off other threads
4444 * to do that as needed.
4445 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4446 * "->recovery" and create a thread at ->sync_thread.
4447 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4448 * and wakeups up this thread which will reap the thread and finish up.
4449 * This thread also removes any faulty devices (with nr_pending == 0).
4451 * The overall approach is:
4452 * 1/ if the superblock needs updating, update it.
4453 * 2/ If a recovery thread is running, don't do anything else.
4454 * 3/ If recovery has finished, clean up, possibly marking spares active.
4455 * 4/ If there are any faulty devices, remove them.
4456 * 5/ If array is degraded, try to add spares devices
4457 * 6/ If array has spares or is not in-sync, start a resync thread.
4459 void md_check_recovery(mddev_t
*mddev
)
4462 struct list_head
*rtmp
;
4466 bitmap_daemon_work(mddev
->bitmap
);
4471 if (signal_pending(current
)) {
4472 if (mddev
->pers
->sync_request
) {
4473 printk(KERN_INFO
"md: %s in immediate safe mode\n",
4475 mddev
->safemode
= 2;
4477 flush_signals(current
);
4482 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
4483 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
4484 (mddev
->safemode
== 1) ||
4485 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
4486 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
4490 if (mddev_trylock(mddev
)==0) {
4493 spin_lock_irq(&mddev
->write_lock
);
4494 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
4495 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
4497 mddev
->sb_dirty
= 1;
4499 if (mddev
->safemode
== 1)
4500 mddev
->safemode
= 0;
4501 spin_unlock_irq(&mddev
->write_lock
);
4503 if (mddev
->sb_dirty
)
4504 md_update_sb(mddev
);
4507 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4508 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
4509 /* resync/recovery still happening */
4510 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4513 if (mddev
->sync_thread
) {
4514 /* resync has finished, collect result */
4515 md_unregister_thread(mddev
->sync_thread
);
4516 mddev
->sync_thread
= NULL
;
4517 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4518 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4520 /* activate any spares */
4521 mddev
->pers
->spare_active(mddev
);
4523 md_update_sb(mddev
);
4525 /* if array is no-longer degraded, then any saved_raid_disk
4526 * information must be scrapped
4528 if (!mddev
->degraded
)
4529 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4530 rdev
->saved_raid_disk
= -1;
4532 mddev
->recovery
= 0;
4533 /* flag recovery needed just to double check */
4534 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4535 md_new_event(mddev
);
4538 /* Clear some bits that don't mean anything, but
4541 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4542 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4543 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4544 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4546 /* no recovery is running.
4547 * remove any failed drives, then
4548 * add spares if possible.
4549 * Spare are also removed and re-added, to allow
4550 * the personality to fail the re-add.
4552 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4553 if (rdev
->raid_disk
>= 0 &&
4554 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
4555 atomic_read(&rdev
->nr_pending
)==0) {
4556 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
4558 sprintf(nm
,"rd%d", rdev
->raid_disk
);
4559 sysfs_remove_link(&mddev
->kobj
, nm
);
4560 rdev
->raid_disk
= -1;
4564 if (mddev
->degraded
) {
4565 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4566 if (rdev
->raid_disk
< 0
4567 && !test_bit(Faulty
, &rdev
->flags
)) {
4568 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
4570 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4571 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
4573 md_new_event(mddev
);
4580 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4581 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4582 } else if (mddev
->recovery_cp
< MaxSector
) {
4583 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4584 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4585 /* nothing to be done ... */
4588 if (mddev
->pers
->sync_request
) {
4589 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4590 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
4591 /* We are adding a device or devices to an array
4592 * which has the bitmap stored on all devices.
4593 * So make sure all bitmap pages get written
4595 bitmap_write_all(mddev
->bitmap
);
4597 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4600 if (!mddev
->sync_thread
) {
4601 printk(KERN_ERR
"%s: could not start resync"
4604 /* leave the spares where they are, it shouldn't hurt */
4605 mddev
->recovery
= 0;
4607 md_wakeup_thread(mddev
->sync_thread
);
4608 md_new_event(mddev
);
4611 mddev_unlock(mddev
);
4615 static int md_notify_reboot(struct notifier_block
*this,
4616 unsigned long code
, void *x
)
4618 struct list_head
*tmp
;
4621 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
4623 printk(KERN_INFO
"md: stopping all md devices.\n");
4625 ITERATE_MDDEV(mddev
,tmp
)
4626 if (mddev_trylock(mddev
)==0)
4627 do_md_stop (mddev
, 1);
4629 * certain more exotic SCSI devices are known to be
4630 * volatile wrt too early system reboots. While the
4631 * right place to handle this issue is the given
4632 * driver, we do want to have a safe RAID driver ...
4639 static struct notifier_block md_notifier
= {
4640 .notifier_call
= md_notify_reboot
,
4642 .priority
= INT_MAX
, /* before any real devices */
4645 static void md_geninit(void)
4647 struct proc_dir_entry
*p
;
4649 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
4651 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
4653 p
->proc_fops
= &md_seq_fops
;
4656 static int __init
md_init(void)
4660 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4661 " MD_SB_DISKS=%d\n",
4662 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
4663 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
4664 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
4667 if (register_blkdev(MAJOR_NR
, "md"))
4669 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
4670 unregister_blkdev(MAJOR_NR
, "md");
4674 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
4675 md_probe
, NULL
, NULL
);
4676 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
4677 md_probe
, NULL
, NULL
);
4679 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4680 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
4681 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4684 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
4685 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
4686 S_IFBLK
|S_IRUSR
|S_IWUSR
,
4690 register_reboot_notifier(&md_notifier
);
4691 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
4701 * Searches all registered partitions for autorun RAID arrays
4704 static dev_t detected_devices
[128];
4707 void md_autodetect_dev(dev_t dev
)
4709 if (dev_cnt
>= 0 && dev_cnt
< 127)
4710 detected_devices
[dev_cnt
++] = dev
;
4714 static void autostart_arrays(int part
)
4719 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
4721 for (i
= 0; i
< dev_cnt
; i
++) {
4722 dev_t dev
= detected_devices
[i
];
4724 rdev
= md_import_device(dev
,0, 0);
4728 if (test_bit(Faulty
, &rdev
->flags
)) {
4732 list_add(&rdev
->same_set
, &pending_raid_disks
);
4736 autorun_devices(part
);
4741 static __exit
void md_exit(void)
4744 struct list_head
*tmp
;
4746 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
4747 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
4748 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4749 devfs_remove("md/%d", i
);
4750 for (i
=0; i
< MAX_MD_DEVS
; i
++)
4751 devfs_remove("md/d%d", i
);
4755 unregister_blkdev(MAJOR_NR
,"md");
4756 unregister_blkdev(mdp_major
, "mdp");
4757 unregister_reboot_notifier(&md_notifier
);
4758 unregister_sysctl_table(raid_table_header
);
4759 remove_proc_entry("mdstat", NULL
);
4760 ITERATE_MDDEV(mddev
,tmp
) {
4761 struct gendisk
*disk
= mddev
->gendisk
;
4764 export_array(mddev
);
4767 mddev
->gendisk
= NULL
;
4772 module_init(md_init
)
4773 module_exit(md_exit
)
4775 static int get_ro(char *buffer
, struct kernel_param
*kp
)
4777 return sprintf(buffer
, "%d", start_readonly
);
4779 static int set_ro(const char *val
, struct kernel_param
*kp
)
4782 int num
= simple_strtoul(val
, &e
, 10);
4783 if (*val
&& (*e
== '\0' || *e
== '\n')) {
4784 start_readonly
= num
;
4790 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, 0600);
4791 module_param(start_dirty_degraded
, int, 0644);
4794 EXPORT_SYMBOL(register_md_personality
);
4795 EXPORT_SYMBOL(unregister_md_personality
);
4796 EXPORT_SYMBOL(md_error
);
4797 EXPORT_SYMBOL(md_done_sync
);
4798 EXPORT_SYMBOL(md_write_start
);
4799 EXPORT_SYMBOL(md_write_end
);
4800 EXPORT_SYMBOL(md_register_thread
);
4801 EXPORT_SYMBOL(md_unregister_thread
);
4802 EXPORT_SYMBOL(md_wakeup_thread
);
4803 EXPORT_SYMBOL(md_print_devices
);
4804 EXPORT_SYMBOL(md_check_recovery
);
4805 MODULE_LICENSE("GPL");
4807 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);