2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
45 #include <linux/poll.h>
46 #include <linux/mutex.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part
);
72 static LIST_HEAD(pers_list
);
73 static DEFINE_SPINLOCK(pers_lock
);
76 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
77 * is 1000 KB/sec, so the extra system load does not show up that much.
78 * Increase it if you want to have more _guaranteed_ speed. Note that
79 * the RAID driver will use the maximum available bandwidth if the IO
80 * subsystem is idle. There is also an 'absolute maximum' reconstruction
81 * speed limit - in case reconstruction slows down your system despite
84 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
85 * or /sys/block/mdX/md/sync_speed_{min,max}
88 static int sysctl_speed_limit_min
= 1000;
89 static int sysctl_speed_limit_max
= 200000;
90 static inline int speed_min(mddev_t
*mddev
)
92 return mddev
->sync_speed_min
?
93 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
96 static inline int speed_max(mddev_t
*mddev
)
98 return mddev
->sync_speed_max
?
99 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
102 static struct ctl_table_header
*raid_table_header
;
104 static ctl_table raid_table
[] = {
106 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
107 .procname
= "speed_limit_min",
108 .data
= &sysctl_speed_limit_min
,
109 .maxlen
= sizeof(int),
111 .proc_handler
= &proc_dointvec
,
114 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
115 .procname
= "speed_limit_max",
116 .data
= &sysctl_speed_limit_max
,
117 .maxlen
= sizeof(int),
119 .proc_handler
= &proc_dointvec
,
124 static ctl_table raid_dir_table
[] = {
126 .ctl_name
= DEV_RAID
,
135 static ctl_table raid_root_table
[] = {
141 .child
= raid_dir_table
,
146 static struct block_device_operations md_fops
;
148 static int start_readonly
;
151 * We have a system wide 'event count' that is incremented
152 * on any 'interesting' event, and readers of /proc/mdstat
153 * can use 'poll' or 'select' to find out when the event
157 * start array, stop array, error, add device, remove device,
158 * start build, activate spare
160 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
161 static atomic_t md_event_count
;
162 void md_new_event(mddev_t
*mddev
)
164 atomic_inc(&md_event_count
);
165 wake_up(&md_event_waiters
);
167 EXPORT_SYMBOL_GPL(md_new_event
);
170 * Enables to iterate over all existing md arrays
171 * all_mddevs_lock protects this list.
173 static LIST_HEAD(all_mddevs
);
174 static DEFINE_SPINLOCK(all_mddevs_lock
);
178 * iterates through all used mddevs in the system.
179 * We take care to grab the all_mddevs_lock whenever navigating
180 * the list, and to always hold a refcount when unlocked.
181 * Any code which breaks out of this loop while own
182 * a reference to the current mddev and must mddev_put it.
184 #define ITERATE_MDDEV(mddev,tmp) \
186 for (({ spin_lock(&all_mddevs_lock); \
187 tmp = all_mddevs.next; \
189 ({ if (tmp != &all_mddevs) \
190 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
191 spin_unlock(&all_mddevs_lock); \
192 if (mddev) mddev_put(mddev); \
193 mddev = list_entry(tmp, mddev_t, all_mddevs); \
194 tmp != &all_mddevs;}); \
195 ({ spin_lock(&all_mddevs_lock); \
200 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
202 bio_io_error(bio
, bio
->bi_size
);
206 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
208 atomic_inc(&mddev
->active
);
212 static void mddev_put(mddev_t
*mddev
)
214 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
216 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
217 list_del(&mddev
->all_mddevs
);
218 spin_unlock(&all_mddevs_lock
);
219 blk_cleanup_queue(mddev
->queue
);
220 kobject_unregister(&mddev
->kobj
);
222 spin_unlock(&all_mddevs_lock
);
225 static mddev_t
* mddev_find(dev_t unit
)
227 mddev_t
*mddev
, *new = NULL
;
230 spin_lock(&all_mddevs_lock
);
231 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
232 if (mddev
->unit
== unit
) {
234 spin_unlock(&all_mddevs_lock
);
240 list_add(&new->all_mddevs
, &all_mddevs
);
241 spin_unlock(&all_mddevs_lock
);
244 spin_unlock(&all_mddevs_lock
);
246 new = kzalloc(sizeof(*new), GFP_KERNEL
);
251 if (MAJOR(unit
) == MD_MAJOR
)
252 new->md_minor
= MINOR(unit
);
254 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
256 mutex_init(&new->reconfig_mutex
);
257 INIT_LIST_HEAD(&new->disks
);
258 INIT_LIST_HEAD(&new->all_mddevs
);
259 init_timer(&new->safemode_timer
);
260 atomic_set(&new->active
, 1);
261 spin_lock_init(&new->write_lock
);
262 init_waitqueue_head(&new->sb_wait
);
264 new->queue
= blk_alloc_queue(GFP_KERNEL
);
269 set_bit(QUEUE_FLAG_CLUSTER
, &new->queue
->queue_flags
);
271 blk_queue_make_request(new->queue
, md_fail_request
);
276 static inline int mddev_lock(mddev_t
* mddev
)
278 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
281 static inline void mddev_lock_uninterruptible(mddev_t
* mddev
)
283 mutex_lock(&mddev
->reconfig_mutex
);
286 static inline int mddev_trylock(mddev_t
* mddev
)
288 return mutex_trylock(&mddev
->reconfig_mutex
);
291 static inline void mddev_unlock(mddev_t
* mddev
)
293 mutex_unlock(&mddev
->reconfig_mutex
);
295 md_wakeup_thread(mddev
->thread
);
298 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
301 struct list_head
*tmp
;
303 ITERATE_RDEV(mddev
,rdev
,tmp
) {
304 if (rdev
->desc_nr
== nr
)
310 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
312 struct list_head
*tmp
;
315 ITERATE_RDEV(mddev
,rdev
,tmp
) {
316 if (rdev
->bdev
->bd_dev
== dev
)
322 static struct mdk_personality
*find_pers(int level
, char *clevel
)
324 struct mdk_personality
*pers
;
325 list_for_each_entry(pers
, &pers_list
, list
) {
326 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
328 if (strcmp(pers
->name
, clevel
)==0)
334 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
336 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
337 return MD_NEW_SIZE_BLOCKS(size
);
340 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
344 size
= rdev
->sb_offset
;
347 size
&= ~((sector_t
)chunk_size
/1024 - 1);
351 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
356 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
357 if (!rdev
->sb_page
) {
358 printk(KERN_ALERT
"md: out of memory.\n");
365 static void free_disk_sb(mdk_rdev_t
* rdev
)
368 put_page(rdev
->sb_page
);
370 rdev
->sb_page
= NULL
;
377 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
379 mdk_rdev_t
*rdev
= bio
->bi_private
;
380 mddev_t
*mddev
= rdev
->mddev
;
384 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
385 md_error(mddev
, rdev
);
387 if (atomic_dec_and_test(&mddev
->pending_writes
))
388 wake_up(&mddev
->sb_wait
);
393 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
395 struct bio
*bio2
= bio
->bi_private
;
396 mdk_rdev_t
*rdev
= bio2
->bi_private
;
397 mddev_t
*mddev
= rdev
->mddev
;
401 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
402 error
== -EOPNOTSUPP
) {
404 /* barriers don't appear to be supported :-( */
405 set_bit(BarriersNotsupp
, &rdev
->flags
);
406 mddev
->barriers_work
= 0;
407 spin_lock_irqsave(&mddev
->write_lock
, flags
);
408 bio2
->bi_next
= mddev
->biolist
;
409 mddev
->biolist
= bio2
;
410 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
411 wake_up(&mddev
->sb_wait
);
416 bio
->bi_private
= rdev
;
417 return super_written(bio
, bytes_done
, error
);
420 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
421 sector_t sector
, int size
, struct page
*page
)
423 /* write first size bytes of page to sector of rdev
424 * Increment mddev->pending_writes before returning
425 * and decrement it on completion, waking up sb_wait
426 * if zero is reached.
427 * If an error occurred, call md_error
429 * As we might need to resubmit the request if BIO_RW_BARRIER
430 * causes ENOTSUPP, we allocate a spare bio...
432 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
433 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
435 bio
->bi_bdev
= rdev
->bdev
;
436 bio
->bi_sector
= sector
;
437 bio_add_page(bio
, page
, size
, 0);
438 bio
->bi_private
= rdev
;
439 bio
->bi_end_io
= super_written
;
442 atomic_inc(&mddev
->pending_writes
);
443 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
445 rw
|= (1<<BIO_RW_BARRIER
);
446 rbio
= bio_clone(bio
, GFP_NOIO
);
447 rbio
->bi_private
= bio
;
448 rbio
->bi_end_io
= super_written_barrier
;
449 submit_bio(rw
, rbio
);
454 void md_super_wait(mddev_t
*mddev
)
456 /* wait for all superblock writes that were scheduled to complete.
457 * if any had to be retried (due to BARRIER problems), retry them
461 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
462 if (atomic_read(&mddev
->pending_writes
)==0)
464 while (mddev
->biolist
) {
466 spin_lock_irq(&mddev
->write_lock
);
467 bio
= mddev
->biolist
;
468 mddev
->biolist
= bio
->bi_next
;
470 spin_unlock_irq(&mddev
->write_lock
);
471 submit_bio(bio
->bi_rw
, bio
);
475 finish_wait(&mddev
->sb_wait
, &wq
);
478 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
483 complete((struct completion
*)bio
->bi_private
);
487 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
488 struct page
*page
, int rw
)
490 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
491 struct completion event
;
494 rw
|= (1 << BIO_RW_SYNC
);
497 bio
->bi_sector
= sector
;
498 bio_add_page(bio
, page
, size
, 0);
499 init_completion(&event
);
500 bio
->bi_private
= &event
;
501 bio
->bi_end_io
= bi_complete
;
503 wait_for_completion(&event
);
505 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
509 EXPORT_SYMBOL_GPL(sync_page_io
);
511 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
513 char b
[BDEVNAME_SIZE
];
514 if (!rdev
->sb_page
) {
522 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
528 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
529 bdevname(rdev
->bdev
,b
));
533 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
535 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
536 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
537 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
538 (sb1
->set_uuid3
== sb2
->set_uuid3
))
546 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
549 mdp_super_t
*tmp1
, *tmp2
;
551 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
552 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
554 if (!tmp1
|| !tmp2
) {
556 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
564 * nr_disks is not constant
569 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
580 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
582 unsigned int disk_csum
, csum
;
584 disk_csum
= sb
->sb_csum
;
586 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
587 sb
->sb_csum
= disk_csum
;
593 * Handle superblock details.
594 * We want to be able to handle multiple superblock formats
595 * so we have a common interface to them all, and an array of
596 * different handlers.
597 * We rely on user-space to write the initial superblock, and support
598 * reading and updating of superblocks.
599 * Interface methods are:
600 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
601 * loads and validates a superblock on dev.
602 * if refdev != NULL, compare superblocks on both devices
604 * 0 - dev has a superblock that is compatible with refdev
605 * 1 - dev has a superblock that is compatible and newer than refdev
606 * so dev should be used as the refdev in future
607 * -EINVAL superblock incompatible or invalid
608 * -othererror e.g. -EIO
610 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
611 * Verify that dev is acceptable into mddev.
612 * The first time, mddev->raid_disks will be 0, and data from
613 * dev should be merged in. Subsequent calls check that dev
614 * is new enough. Return 0 or -EINVAL
616 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
617 * Update the superblock for rdev with data in mddev
618 * This does not write to disc.
624 struct module
*owner
;
625 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
626 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
627 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
631 * load_super for 0.90.0
633 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
635 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
641 * Calculate the position of the superblock,
642 * it's at the end of the disk.
644 * It also happens to be a multiple of 4Kb.
646 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
647 rdev
->sb_offset
= sb_offset
;
649 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
654 bdevname(rdev
->bdev
, b
);
655 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
657 if (sb
->md_magic
!= MD_SB_MAGIC
) {
658 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
663 if (sb
->major_version
!= 0 ||
664 sb
->minor_version
< 90 ||
665 sb
->minor_version
> 91) {
666 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
667 sb
->major_version
, sb
->minor_version
,
672 if (sb
->raid_disks
<= 0)
675 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
676 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
681 rdev
->preferred_minor
= sb
->md_minor
;
682 rdev
->data_offset
= 0;
683 rdev
->sb_size
= MD_SB_BYTES
;
685 if (sb
->level
== LEVEL_MULTIPATH
)
688 rdev
->desc_nr
= sb
->this_disk
.number
;
694 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
695 if (!uuid_equal(refsb
, sb
)) {
696 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
697 b
, bdevname(refdev
->bdev
,b2
));
700 if (!sb_equal(refsb
, sb
)) {
701 printk(KERN_WARNING
"md: %s has same UUID"
702 " but different superblock to %s\n",
703 b
, bdevname(refdev
->bdev
, b2
));
707 ev2
= md_event(refsb
);
713 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
715 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
716 /* "this cannot possibly happen" ... */
724 * validate_super for 0.90.0
726 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
729 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
731 rdev
->raid_disk
= -1;
733 if (mddev
->raid_disks
== 0) {
734 mddev
->major_version
= 0;
735 mddev
->minor_version
= sb
->minor_version
;
736 mddev
->patch_version
= sb
->patch_version
;
737 mddev
->persistent
= ! sb
->not_persistent
;
738 mddev
->chunk_size
= sb
->chunk_size
;
739 mddev
->ctime
= sb
->ctime
;
740 mddev
->utime
= sb
->utime
;
741 mddev
->level
= sb
->level
;
742 mddev
->clevel
[0] = 0;
743 mddev
->layout
= sb
->layout
;
744 mddev
->raid_disks
= sb
->raid_disks
;
745 mddev
->size
= sb
->size
;
746 mddev
->events
= md_event(sb
);
747 mddev
->bitmap_offset
= 0;
748 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
750 if (mddev
->minor_version
>= 91) {
751 mddev
->reshape_position
= sb
->reshape_position
;
752 mddev
->delta_disks
= sb
->delta_disks
;
753 mddev
->new_level
= sb
->new_level
;
754 mddev
->new_layout
= sb
->new_layout
;
755 mddev
->new_chunk
= sb
->new_chunk
;
757 mddev
->reshape_position
= MaxSector
;
758 mddev
->delta_disks
= 0;
759 mddev
->new_level
= mddev
->level
;
760 mddev
->new_layout
= mddev
->layout
;
761 mddev
->new_chunk
= mddev
->chunk_size
;
764 if (sb
->state
& (1<<MD_SB_CLEAN
))
765 mddev
->recovery_cp
= MaxSector
;
767 if (sb
->events_hi
== sb
->cp_events_hi
&&
768 sb
->events_lo
== sb
->cp_events_lo
) {
769 mddev
->recovery_cp
= sb
->recovery_cp
;
771 mddev
->recovery_cp
= 0;
774 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
775 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
776 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
777 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
779 mddev
->max_disks
= MD_SB_DISKS
;
781 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
782 mddev
->bitmap_file
== NULL
) {
783 if (mddev
->level
!= 1 && mddev
->level
!= 4
784 && mddev
->level
!= 5 && mddev
->level
!= 6
785 && mddev
->level
!= 10) {
786 /* FIXME use a better test */
787 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
790 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
793 } else if (mddev
->pers
== NULL
) {
794 /* Insist on good event counter while assembling */
795 __u64 ev1
= md_event(sb
);
797 if (ev1
< mddev
->events
)
799 } else if (mddev
->bitmap
) {
800 /* if adding to array with a bitmap, then we can accept an
801 * older device ... but not too old.
803 __u64 ev1
= md_event(sb
);
804 if (ev1
< mddev
->bitmap
->events_cleared
)
806 } else /* just a hot-add of a new device, leave raid_disk at -1 */
809 if (mddev
->level
!= LEVEL_MULTIPATH
) {
810 desc
= sb
->disks
+ rdev
->desc_nr
;
812 if (desc
->state
& (1<<MD_DISK_FAULTY
))
813 set_bit(Faulty
, &rdev
->flags
);
814 else if (desc
->state
& (1<<MD_DISK_SYNC
) &&
815 desc
->raid_disk
< mddev
->raid_disks
) {
816 set_bit(In_sync
, &rdev
->flags
);
817 rdev
->raid_disk
= desc
->raid_disk
;
819 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
820 set_bit(WriteMostly
, &rdev
->flags
);
821 } else /* MULTIPATH are always insync */
822 set_bit(In_sync
, &rdev
->flags
);
827 * sync_super for 0.90.0
829 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
832 struct list_head
*tmp
;
834 int next_spare
= mddev
->raid_disks
;
837 /* make rdev->sb match mddev data..
840 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
841 * 3/ any empty disks < next_spare become removed
843 * disks[0] gets initialised to REMOVED because
844 * we cannot be sure from other fields if it has
845 * been initialised or not.
848 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
850 rdev
->sb_size
= MD_SB_BYTES
;
852 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
854 memset(sb
, 0, sizeof(*sb
));
856 sb
->md_magic
= MD_SB_MAGIC
;
857 sb
->major_version
= mddev
->major_version
;
858 sb
->patch_version
= mddev
->patch_version
;
859 sb
->gvalid_words
= 0; /* ignored */
860 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
861 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
862 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
863 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
865 sb
->ctime
= mddev
->ctime
;
866 sb
->level
= mddev
->level
;
867 sb
->size
= mddev
->size
;
868 sb
->raid_disks
= mddev
->raid_disks
;
869 sb
->md_minor
= mddev
->md_minor
;
870 sb
->not_persistent
= !mddev
->persistent
;
871 sb
->utime
= mddev
->utime
;
873 sb
->events_hi
= (mddev
->events
>>32);
874 sb
->events_lo
= (u32
)mddev
->events
;
876 if (mddev
->reshape_position
== MaxSector
)
877 sb
->minor_version
= 90;
879 sb
->minor_version
= 91;
880 sb
->reshape_position
= mddev
->reshape_position
;
881 sb
->new_level
= mddev
->new_level
;
882 sb
->delta_disks
= mddev
->delta_disks
;
883 sb
->new_layout
= mddev
->new_layout
;
884 sb
->new_chunk
= mddev
->new_chunk
;
886 mddev
->minor_version
= sb
->minor_version
;
889 sb
->recovery_cp
= mddev
->recovery_cp
;
890 sb
->cp_events_hi
= (mddev
->events
>>32);
891 sb
->cp_events_lo
= (u32
)mddev
->events
;
892 if (mddev
->recovery_cp
== MaxSector
)
893 sb
->state
= (1<< MD_SB_CLEAN
);
897 sb
->layout
= mddev
->layout
;
898 sb
->chunk_size
= mddev
->chunk_size
;
900 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
901 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
903 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
904 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
907 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
908 && !test_bit(Faulty
, &rdev2
->flags
))
909 desc_nr
= rdev2
->raid_disk
;
911 desc_nr
= next_spare
++;
912 rdev2
->desc_nr
= desc_nr
;
913 d
= &sb
->disks
[rdev2
->desc_nr
];
915 d
->number
= rdev2
->desc_nr
;
916 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
917 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
918 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
919 && !test_bit(Faulty
, &rdev2
->flags
))
920 d
->raid_disk
= rdev2
->raid_disk
;
922 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
923 if (test_bit(Faulty
, &rdev2
->flags
))
924 d
->state
= (1<<MD_DISK_FAULTY
);
925 else if (test_bit(In_sync
, &rdev2
->flags
)) {
926 d
->state
= (1<<MD_DISK_ACTIVE
);
927 d
->state
|= (1<<MD_DISK_SYNC
);
935 if (test_bit(WriteMostly
, &rdev2
->flags
))
936 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
938 /* now set the "removed" and "faulty" bits on any missing devices */
939 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
940 mdp_disk_t
*d
= &sb
->disks
[i
];
941 if (d
->state
== 0 && d
->number
== 0) {
944 d
->state
= (1<<MD_DISK_REMOVED
);
945 d
->state
|= (1<<MD_DISK_FAULTY
);
949 sb
->nr_disks
= nr_disks
;
950 sb
->active_disks
= active
;
951 sb
->working_disks
= working
;
952 sb
->failed_disks
= failed
;
953 sb
->spare_disks
= spare
;
955 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
956 sb
->sb_csum
= calc_sb_csum(sb
);
960 * version 1 superblock
963 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
965 unsigned int disk_csum
, csum
;
966 unsigned long long newcsum
;
967 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
968 unsigned int *isuper
= (unsigned int*)sb
;
971 disk_csum
= sb
->sb_csum
;
974 for (i
=0; size
>=4; size
-= 4 )
975 newcsum
+= le32_to_cpu(*isuper
++);
978 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
980 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
981 sb
->sb_csum
= disk_csum
;
982 return cpu_to_le32(csum
);
985 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
987 struct mdp_superblock_1
*sb
;
990 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
994 * Calculate the position of the superblock.
995 * It is always aligned to a 4K boundary and
996 * depeding on minor_version, it can be:
997 * 0: At least 8K, but less than 12K, from end of device
998 * 1: At start of device
999 * 2: 4K from start of device.
1001 switch(minor_version
) {
1003 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1005 sb_offset
&= ~(sector_t
)(4*2-1);
1006 /* convert from sectors to K */
1018 rdev
->sb_offset
= sb_offset
;
1020 /* superblock is rarely larger than 1K, but it can be larger,
1021 * and it is safe to read 4k, so we do that
1023 ret
= read_disk_sb(rdev
, 4096);
1024 if (ret
) return ret
;
1027 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1029 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1030 sb
->major_version
!= cpu_to_le32(1) ||
1031 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1032 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1033 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1036 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1037 printk("md: invalid superblock checksum on %s\n",
1038 bdevname(rdev
->bdev
,b
));
1041 if (le64_to_cpu(sb
->data_size
) < 10) {
1042 printk("md: data_size too small on %s\n",
1043 bdevname(rdev
->bdev
,b
));
1046 rdev
->preferred_minor
= 0xffff;
1047 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1048 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1050 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1051 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1052 if (rdev
->sb_size
& bmask
)
1053 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1059 struct mdp_superblock_1
*refsb
=
1060 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1062 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1063 sb
->level
!= refsb
->level
||
1064 sb
->layout
!= refsb
->layout
||
1065 sb
->chunksize
!= refsb
->chunksize
) {
1066 printk(KERN_WARNING
"md: %s has strangely different"
1067 " superblock to %s\n",
1068 bdevname(rdev
->bdev
,b
),
1069 bdevname(refdev
->bdev
,b2
));
1072 ev1
= le64_to_cpu(sb
->events
);
1073 ev2
= le64_to_cpu(refsb
->events
);
1081 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1083 rdev
->size
= rdev
->sb_offset
;
1084 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1086 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1087 if (le32_to_cpu(sb
->chunksize
))
1088 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1090 if (le32_to_cpu(sb
->size
) > rdev
->size
*2)
1095 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1097 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1099 rdev
->raid_disk
= -1;
1101 if (mddev
->raid_disks
== 0) {
1102 mddev
->major_version
= 1;
1103 mddev
->patch_version
= 0;
1104 mddev
->persistent
= 1;
1105 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1106 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1107 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1108 mddev
->level
= le32_to_cpu(sb
->level
);
1109 mddev
->clevel
[0] = 0;
1110 mddev
->layout
= le32_to_cpu(sb
->layout
);
1111 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1112 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1113 mddev
->events
= le64_to_cpu(sb
->events
);
1114 mddev
->bitmap_offset
= 0;
1115 mddev
->default_bitmap_offset
= 1024 >> 9;
1117 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1118 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1120 mddev
->max_disks
= (4096-256)/2;
1122 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1123 mddev
->bitmap_file
== NULL
) {
1124 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
1125 && mddev
->level
!= 10) {
1126 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
1129 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1131 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1132 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1133 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1134 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1135 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1136 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1138 mddev
->reshape_position
= MaxSector
;
1139 mddev
->delta_disks
= 0;
1140 mddev
->new_level
= mddev
->level
;
1141 mddev
->new_layout
= mddev
->layout
;
1142 mddev
->new_chunk
= mddev
->chunk_size
;
1145 } else if (mddev
->pers
== NULL
) {
1146 /* Insist of good event counter while assembling */
1147 __u64 ev1
= le64_to_cpu(sb
->events
);
1149 if (ev1
< mddev
->events
)
1151 } else if (mddev
->bitmap
) {
1152 /* If adding to array with a bitmap, then we can accept an
1153 * older device, but not too old.
1155 __u64 ev1
= le64_to_cpu(sb
->events
);
1156 if (ev1
< mddev
->bitmap
->events_cleared
)
1158 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1161 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1163 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1164 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1166 case 0xffff: /* spare */
1168 case 0xfffe: /* faulty */
1169 set_bit(Faulty
, &rdev
->flags
);
1172 set_bit(In_sync
, &rdev
->flags
);
1173 rdev
->raid_disk
= role
;
1176 if (sb
->devflags
& WriteMostly1
)
1177 set_bit(WriteMostly
, &rdev
->flags
);
1178 } else /* MULTIPATH are always insync */
1179 set_bit(In_sync
, &rdev
->flags
);
1184 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1186 struct mdp_superblock_1
*sb
;
1187 struct list_head
*tmp
;
1190 /* make rdev->sb match mddev and rdev data. */
1192 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1194 sb
->feature_map
= 0;
1196 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1197 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1198 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1200 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1201 sb
->events
= cpu_to_le64(mddev
->events
);
1203 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1205 sb
->resync_offset
= cpu_to_le64(0);
1207 sb
->cnt_corrected_read
= atomic_read(&rdev
->corrected_errors
);
1209 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1210 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1212 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1213 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1214 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1216 if (mddev
->reshape_position
!= MaxSector
) {
1217 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1218 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1219 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1220 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1221 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1222 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1226 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1227 if (rdev2
->desc_nr
+1 > max_dev
)
1228 max_dev
= rdev2
->desc_nr
+1;
1230 sb
->max_dev
= cpu_to_le32(max_dev
);
1231 for (i
=0; i
<max_dev
;i
++)
1232 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1234 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1236 if (test_bit(Faulty
, &rdev2
->flags
))
1237 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1238 else if (test_bit(In_sync
, &rdev2
->flags
))
1239 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1241 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1244 sb
->recovery_offset
= cpu_to_le64(0); /* not supported yet */
1245 sb
->sb_csum
= calc_sb_1_csum(sb
);
1249 static struct super_type super_types
[] = {
1252 .owner
= THIS_MODULE
,
1253 .load_super
= super_90_load
,
1254 .validate_super
= super_90_validate
,
1255 .sync_super
= super_90_sync
,
1259 .owner
= THIS_MODULE
,
1260 .load_super
= super_1_load
,
1261 .validate_super
= super_1_validate
,
1262 .sync_super
= super_1_sync
,
1266 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1268 struct list_head
*tmp
;
1271 ITERATE_RDEV(mddev
,rdev
,tmp
)
1272 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1278 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1280 struct list_head
*tmp
;
1283 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1284 if (match_dev_unit(mddev2
, rdev
))
1290 static LIST_HEAD(pending_raid_disks
);
1292 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1294 mdk_rdev_t
*same_pdev
;
1295 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1303 /* make sure rdev->size exceeds mddev->size */
1304 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1306 /* Cannot change size, so fail */
1309 mddev
->size
= rdev
->size
;
1311 same_pdev
= match_dev_unit(mddev
, rdev
);
1314 "%s: WARNING: %s appears to be on the same physical"
1315 " disk as %s. True\n protection against single-disk"
1316 " failure might be compromised.\n",
1317 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1318 bdevname(same_pdev
->bdev
,b2
));
1320 /* Verify rdev->desc_nr is unique.
1321 * If it is -1, assign a free number, else
1322 * check number is not in use
1324 if (rdev
->desc_nr
< 0) {
1326 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1327 while (find_rdev_nr(mddev
, choice
))
1329 rdev
->desc_nr
= choice
;
1331 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1334 bdevname(rdev
->bdev
,b
);
1335 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1337 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1340 list_add(&rdev
->same_set
, &mddev
->disks
);
1341 rdev
->mddev
= mddev
;
1342 printk(KERN_INFO
"md: bind<%s>\n", b
);
1344 rdev
->kobj
.parent
= &mddev
->kobj
;
1345 kobject_add(&rdev
->kobj
);
1347 if (rdev
->bdev
->bd_part
)
1348 ko
= &rdev
->bdev
->bd_part
->kobj
;
1350 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1351 sysfs_create_link(&rdev
->kobj
, ko
, "block");
1352 bd_claim_by_disk(rdev
->bdev
, rdev
, mddev
->gendisk
);
1356 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1358 char b
[BDEVNAME_SIZE
];
1363 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1364 list_del_init(&rdev
->same_set
);
1365 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1367 sysfs_remove_link(&rdev
->kobj
, "block");
1368 kobject_del(&rdev
->kobj
);
1372 * prevent the device from being mounted, repartitioned or
1373 * otherwise reused by a RAID array (or any other kernel
1374 * subsystem), by bd_claiming the device.
1376 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1379 struct block_device
*bdev
;
1380 char b
[BDEVNAME_SIZE
];
1382 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1384 printk(KERN_ERR
"md: could not open %s.\n",
1385 __bdevname(dev
, b
));
1386 return PTR_ERR(bdev
);
1388 err
= bd_claim(bdev
, rdev
);
1390 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1399 static void unlock_rdev(mdk_rdev_t
*rdev
)
1401 struct block_device
*bdev
= rdev
->bdev
;
1409 void md_autodetect_dev(dev_t dev
);
1411 static void export_rdev(mdk_rdev_t
* rdev
)
1413 char b
[BDEVNAME_SIZE
];
1414 printk(KERN_INFO
"md: export_rdev(%s)\n",
1415 bdevname(rdev
->bdev
,b
));
1419 list_del_init(&rdev
->same_set
);
1421 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1424 kobject_put(&rdev
->kobj
);
1427 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1429 unbind_rdev_from_array(rdev
);
1433 static void export_array(mddev_t
*mddev
)
1435 struct list_head
*tmp
;
1438 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1443 kick_rdev_from_array(rdev
);
1445 if (!list_empty(&mddev
->disks
))
1447 mddev
->raid_disks
= 0;
1448 mddev
->major_version
= 0;
1451 static void print_desc(mdp_disk_t
*desc
)
1453 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1454 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1457 static void print_sb(mdp_super_t
*sb
)
1462 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1463 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1464 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1466 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1467 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1468 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1469 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1470 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1471 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1472 sb
->failed_disks
, sb
->spare_disks
,
1473 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1476 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1479 desc
= sb
->disks
+ i
;
1480 if (desc
->number
|| desc
->major
|| desc
->minor
||
1481 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1482 printk(" D %2d: ", i
);
1486 printk(KERN_INFO
"md: THIS: ");
1487 print_desc(&sb
->this_disk
);
1491 static void print_rdev(mdk_rdev_t
*rdev
)
1493 char b
[BDEVNAME_SIZE
];
1494 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1495 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1496 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1498 if (rdev
->sb_loaded
) {
1499 printk(KERN_INFO
"md: rdev superblock:\n");
1500 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1502 printk(KERN_INFO
"md: no rdev superblock!\n");
1505 void md_print_devices(void)
1507 struct list_head
*tmp
, *tmp2
;
1510 char b
[BDEVNAME_SIZE
];
1513 printk("md: **********************************\n");
1514 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1515 printk("md: **********************************\n");
1516 ITERATE_MDDEV(mddev
,tmp
) {
1519 bitmap_print_sb(mddev
->bitmap
);
1521 printk("%s: ", mdname(mddev
));
1522 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1523 printk("<%s>", bdevname(rdev
->bdev
,b
));
1526 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1529 printk("md: **********************************\n");
1534 static void sync_sbs(mddev_t
* mddev
)
1537 struct list_head
*tmp
;
1539 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1540 super_types
[mddev
->major_version
].
1541 sync_super(mddev
, rdev
);
1542 rdev
->sb_loaded
= 1;
1546 void md_update_sb(mddev_t
* mddev
)
1549 struct list_head
*tmp
;
1554 spin_lock_irq(&mddev
->write_lock
);
1555 sync_req
= mddev
->in_sync
;
1556 mddev
->utime
= get_seconds();
1559 if (!mddev
->events
) {
1561 * oops, this 64-bit counter should never wrap.
1562 * Either we are in around ~1 trillion A.C., assuming
1563 * 1 reboot per second, or we have a bug:
1568 mddev
->sb_dirty
= 2;
1572 * do not write anything to disk if using
1573 * nonpersistent superblocks
1575 if (!mddev
->persistent
) {
1576 mddev
->sb_dirty
= 0;
1577 spin_unlock_irq(&mddev
->write_lock
);
1578 wake_up(&mddev
->sb_wait
);
1581 spin_unlock_irq(&mddev
->write_lock
);
1584 "md: updating %s RAID superblock on device (in sync %d)\n",
1585 mdname(mddev
),mddev
->in_sync
);
1587 err
= bitmap_update_sb(mddev
->bitmap
);
1588 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1589 char b
[BDEVNAME_SIZE
];
1590 dprintk(KERN_INFO
"md: ");
1591 if (test_bit(Faulty
, &rdev
->flags
))
1592 dprintk("(skipping faulty ");
1594 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1595 if (!test_bit(Faulty
, &rdev
->flags
)) {
1596 md_super_write(mddev
,rdev
,
1597 rdev
->sb_offset
<<1, rdev
->sb_size
,
1599 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1600 bdevname(rdev
->bdev
,b
),
1601 (unsigned long long)rdev
->sb_offset
);
1605 if (mddev
->level
== LEVEL_MULTIPATH
)
1606 /* only need to write one superblock... */
1609 md_super_wait(mddev
);
1610 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1612 spin_lock_irq(&mddev
->write_lock
);
1613 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1614 /* have to write it out again */
1615 spin_unlock_irq(&mddev
->write_lock
);
1618 mddev
->sb_dirty
= 0;
1619 spin_unlock_irq(&mddev
->write_lock
);
1620 wake_up(&mddev
->sb_wait
);
1623 EXPORT_SYMBOL_GPL(md_update_sb
);
1625 /* words written to sysfs files may, or my not, be \n terminated.
1626 * We want to accept with case. For this we use cmd_match.
1628 static int cmd_match(const char *cmd
, const char *str
)
1630 /* See if cmd, written into a sysfs file, matches
1631 * str. They must either be the same, or cmd can
1632 * have a trailing newline
1634 while (*cmd
&& *str
&& *cmd
== *str
) {
1645 struct rdev_sysfs_entry
{
1646 struct attribute attr
;
1647 ssize_t (*show
)(mdk_rdev_t
*, char *);
1648 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1652 state_show(mdk_rdev_t
*rdev
, char *page
)
1657 if (test_bit(Faulty
, &rdev
->flags
)) {
1658 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1661 if (test_bit(In_sync
, &rdev
->flags
)) {
1662 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1665 if (!test_bit(Faulty
, &rdev
->flags
) &&
1666 !test_bit(In_sync
, &rdev
->flags
)) {
1667 len
+= sprintf(page
+len
, "%sspare", sep
);
1670 return len
+sprintf(page
+len
, "\n");
1673 static struct rdev_sysfs_entry
1674 rdev_state
= __ATTR_RO(state
);
1677 super_show(mdk_rdev_t
*rdev
, char *page
)
1679 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1680 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1681 return rdev
->sb_size
;
1685 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1688 errors_show(mdk_rdev_t
*rdev
, char *page
)
1690 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1694 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1697 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1698 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1699 atomic_set(&rdev
->corrected_errors
, n
);
1704 static struct rdev_sysfs_entry rdev_errors
=
1705 __ATTR(errors
, 0644, errors_show
, errors_store
);
1708 slot_show(mdk_rdev_t
*rdev
, char *page
)
1710 if (rdev
->raid_disk
< 0)
1711 return sprintf(page
, "none\n");
1713 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1717 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1720 int slot
= simple_strtoul(buf
, &e
, 10);
1721 if (strncmp(buf
, "none", 4)==0)
1723 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1725 if (rdev
->mddev
->pers
)
1726 /* Cannot set slot in active array (yet) */
1728 if (slot
>= rdev
->mddev
->raid_disks
)
1730 rdev
->raid_disk
= slot
;
1731 /* assume it is working */
1733 set_bit(In_sync
, &rdev
->flags
);
1738 static struct rdev_sysfs_entry rdev_slot
=
1739 __ATTR(slot
, 0644, slot_show
, slot_store
);
1742 offset_show(mdk_rdev_t
*rdev
, char *page
)
1744 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1748 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1751 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1752 if (e
==buf
|| (*e
&& *e
!= '\n'))
1754 if (rdev
->mddev
->pers
)
1756 rdev
->data_offset
= offset
;
1760 static struct rdev_sysfs_entry rdev_offset
=
1761 __ATTR(offset
, 0644, offset_show
, offset_store
);
1764 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1766 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1770 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1773 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1774 if (e
==buf
|| (*e
&& *e
!= '\n'))
1776 if (rdev
->mddev
->pers
)
1779 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1780 rdev
->mddev
->size
= size
;
1784 static struct rdev_sysfs_entry rdev_size
=
1785 __ATTR(size
, 0644, rdev_size_show
, rdev_size_store
);
1787 static struct attribute
*rdev_default_attrs
[] = {
1797 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1799 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1800 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1804 return entry
->show(rdev
, page
);
1808 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1809 const char *page
, size_t length
)
1811 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1812 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1816 return entry
->store(rdev
, page
, length
);
1819 static void rdev_free(struct kobject
*ko
)
1821 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1824 static struct sysfs_ops rdev_sysfs_ops
= {
1825 .show
= rdev_attr_show
,
1826 .store
= rdev_attr_store
,
1828 static struct kobj_type rdev_ktype
= {
1829 .release
= rdev_free
,
1830 .sysfs_ops
= &rdev_sysfs_ops
,
1831 .default_attrs
= rdev_default_attrs
,
1835 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1837 * mark the device faulty if:
1839 * - the device is nonexistent (zero size)
1840 * - the device has no valid superblock
1842 * a faulty rdev _never_ has rdev->sb set.
1844 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1846 char b
[BDEVNAME_SIZE
];
1851 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
1853 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1854 return ERR_PTR(-ENOMEM
);
1857 if ((err
= alloc_disk_sb(rdev
)))
1860 err
= lock_rdev(rdev
, newdev
);
1864 rdev
->kobj
.parent
= NULL
;
1865 rdev
->kobj
.ktype
= &rdev_ktype
;
1866 kobject_init(&rdev
->kobj
);
1870 rdev
->data_offset
= 0;
1871 atomic_set(&rdev
->nr_pending
, 0);
1872 atomic_set(&rdev
->read_errors
, 0);
1873 atomic_set(&rdev
->corrected_errors
, 0);
1875 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1878 "md: %s has zero or unknown size, marking faulty!\n",
1879 bdevname(rdev
->bdev
,b
));
1884 if (super_format
>= 0) {
1885 err
= super_types
[super_format
].
1886 load_super(rdev
, NULL
, super_minor
);
1887 if (err
== -EINVAL
) {
1889 "md: %s has invalid sb, not importing!\n",
1890 bdevname(rdev
->bdev
,b
));
1895 "md: could not read %s's sb, not importing!\n",
1896 bdevname(rdev
->bdev
,b
));
1900 INIT_LIST_HEAD(&rdev
->same_set
);
1905 if (rdev
->sb_page
) {
1911 return ERR_PTR(err
);
1915 * Check a full RAID array for plausibility
1919 static void analyze_sbs(mddev_t
* mddev
)
1922 struct list_head
*tmp
;
1923 mdk_rdev_t
*rdev
, *freshest
;
1924 char b
[BDEVNAME_SIZE
];
1927 ITERATE_RDEV(mddev
,rdev
,tmp
)
1928 switch (super_types
[mddev
->major_version
].
1929 load_super(rdev
, freshest
, mddev
->minor_version
)) {
1937 "md: fatal superblock inconsistency in %s"
1938 " -- removing from array\n",
1939 bdevname(rdev
->bdev
,b
));
1940 kick_rdev_from_array(rdev
);
1944 super_types
[mddev
->major_version
].
1945 validate_super(mddev
, freshest
);
1948 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1949 if (rdev
!= freshest
)
1950 if (super_types
[mddev
->major_version
].
1951 validate_super(mddev
, rdev
)) {
1952 printk(KERN_WARNING
"md: kicking non-fresh %s"
1954 bdevname(rdev
->bdev
,b
));
1955 kick_rdev_from_array(rdev
);
1958 if (mddev
->level
== LEVEL_MULTIPATH
) {
1959 rdev
->desc_nr
= i
++;
1960 rdev
->raid_disk
= rdev
->desc_nr
;
1961 set_bit(In_sync
, &rdev
->flags
);
1967 if (mddev
->recovery_cp
!= MaxSector
&&
1969 printk(KERN_ERR
"md: %s: raid array is not clean"
1970 " -- starting background reconstruction\n",
1976 level_show(mddev_t
*mddev
, char *page
)
1978 struct mdk_personality
*p
= mddev
->pers
;
1980 return sprintf(page
, "%s\n", p
->name
);
1981 else if (mddev
->clevel
[0])
1982 return sprintf(page
, "%s\n", mddev
->clevel
);
1983 else if (mddev
->level
!= LEVEL_NONE
)
1984 return sprintf(page
, "%d\n", mddev
->level
);
1990 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
1997 if (len
>= sizeof(mddev
->clevel
))
1999 strncpy(mddev
->clevel
, buf
, len
);
2000 if (mddev
->clevel
[len
-1] == '\n')
2002 mddev
->clevel
[len
] = 0;
2003 mddev
->level
= LEVEL_NONE
;
2007 static struct md_sysfs_entry md_level
=
2008 __ATTR(level
, 0644, level_show
, level_store
);
2011 raid_disks_show(mddev_t
*mddev
, char *page
)
2013 if (mddev
->raid_disks
== 0)
2015 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2018 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2021 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2023 /* can only set raid_disks if array is not yet active */
2026 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2028 if (!*buf
|| (*e
&& *e
!= '\n'))
2032 rv
= update_raid_disks(mddev
, n
);
2034 mddev
->raid_disks
= n
;
2035 return rv
? rv
: len
;
2037 static struct md_sysfs_entry md_raid_disks
=
2038 __ATTR(raid_disks
, 0644, raid_disks_show
, raid_disks_store
);
2041 chunk_size_show(mddev_t
*mddev
, char *page
)
2043 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2047 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2049 /* can only set chunk_size if array is not yet active */
2051 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2055 if (!*buf
|| (*e
&& *e
!= '\n'))
2058 mddev
->chunk_size
= n
;
2061 static struct md_sysfs_entry md_chunk_size
=
2062 __ATTR(chunk_size
, 0644, chunk_size_show
, chunk_size_store
);
2065 null_show(mddev_t
*mddev
, char *page
)
2071 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2073 /* buf must be %d:%d\n? giving major and minor numbers */
2074 /* The new device is added to the array.
2075 * If the array has a persistent superblock, we read the
2076 * superblock to initialise info and check validity.
2077 * Otherwise, only checking done is that in bind_rdev_to_array,
2078 * which mainly checks size.
2081 int major
= simple_strtoul(buf
, &e
, 10);
2087 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2089 minor
= simple_strtoul(e
+1, &e
, 10);
2090 if (*e
&& *e
!= '\n')
2092 dev
= MKDEV(major
, minor
);
2093 if (major
!= MAJOR(dev
) ||
2094 minor
!= MINOR(dev
))
2098 if (mddev
->persistent
) {
2099 rdev
= md_import_device(dev
, mddev
->major_version
,
2100 mddev
->minor_version
);
2101 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2102 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2103 mdk_rdev_t
, same_set
);
2104 err
= super_types
[mddev
->major_version
]
2105 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2110 rdev
= md_import_device(dev
, -1, -1);
2113 return PTR_ERR(rdev
);
2114 err
= bind_rdev_to_array(rdev
, mddev
);
2118 return err
? err
: len
;
2121 static struct md_sysfs_entry md_new_device
=
2122 __ATTR(new_dev
, 0200, null_show
, new_dev_store
);
2125 size_show(mddev_t
*mddev
, char *page
)
2127 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2130 static int update_size(mddev_t
*mddev
, unsigned long size
);
2133 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2135 /* If array is inactive, we can reduce the component size, but
2136 * not increase it (except from 0).
2137 * If array is active, we can try an on-line resize
2141 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2142 if (!*buf
|| *buf
== '\n' ||
2147 err
= update_size(mddev
, size
);
2148 md_update_sb(mddev
);
2150 if (mddev
->size
== 0 ||
2156 return err
? err
: len
;
2159 static struct md_sysfs_entry md_size
=
2160 __ATTR(component_size
, 0644, size_show
, size_store
);
2164 * This is either 'none' for arrays with externally managed metadata,
2165 * or N.M for internally known formats
2168 metadata_show(mddev_t
*mddev
, char *page
)
2170 if (mddev
->persistent
)
2171 return sprintf(page
, "%d.%d\n",
2172 mddev
->major_version
, mddev
->minor_version
);
2174 return sprintf(page
, "none\n");
2178 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2182 if (!list_empty(&mddev
->disks
))
2185 if (cmd_match(buf
, "none")) {
2186 mddev
->persistent
= 0;
2187 mddev
->major_version
= 0;
2188 mddev
->minor_version
= 90;
2191 major
= simple_strtoul(buf
, &e
, 10);
2192 if (e
==buf
|| *e
!= '.')
2195 minor
= simple_strtoul(buf
, &e
, 10);
2196 if (e
==buf
|| *e
!= '\n')
2198 if (major
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2199 super_types
[major
].name
== NULL
)
2201 mddev
->major_version
= major
;
2202 mddev
->minor_version
= minor
;
2203 mddev
->persistent
= 1;
2207 static struct md_sysfs_entry md_metadata
=
2208 __ATTR(metadata_version
, 0644, metadata_show
, metadata_store
);
2211 action_show(mddev_t
*mddev
, char *page
)
2213 char *type
= "idle";
2214 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2215 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2216 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2218 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2219 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2221 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2228 return sprintf(page
, "%s\n", type
);
2232 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2234 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2237 if (cmd_match(page
, "idle")) {
2238 if (mddev
->sync_thread
) {
2239 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2240 md_unregister_thread(mddev
->sync_thread
);
2241 mddev
->sync_thread
= NULL
;
2242 mddev
->recovery
= 0;
2244 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2245 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2247 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2248 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2249 else if (cmd_match(page
, "reshape")) {
2251 if (mddev
->pers
->start_reshape
== NULL
)
2253 err
= mddev
->pers
->start_reshape(mddev
);
2257 if (cmd_match(page
, "check"))
2258 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2259 else if (cmd_match(page
, "repair"))
2261 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2262 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2264 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2265 md_wakeup_thread(mddev
->thread
);
2270 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2272 return sprintf(page
, "%llu\n",
2273 (unsigned long long) mddev
->resync_mismatches
);
2276 static struct md_sysfs_entry
2277 md_scan_mode
= __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2280 static struct md_sysfs_entry
2281 md_mismatches
= __ATTR_RO(mismatch_cnt
);
2284 sync_min_show(mddev_t
*mddev
, char *page
)
2286 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2287 mddev
->sync_speed_min
? "local": "system");
2291 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2295 if (strncmp(buf
, "system", 6)==0) {
2296 mddev
->sync_speed_min
= 0;
2299 min
= simple_strtoul(buf
, &e
, 10);
2300 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2302 mddev
->sync_speed_min
= min
;
2306 static struct md_sysfs_entry md_sync_min
=
2307 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2310 sync_max_show(mddev_t
*mddev
, char *page
)
2312 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2313 mddev
->sync_speed_max
? "local": "system");
2317 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2321 if (strncmp(buf
, "system", 6)==0) {
2322 mddev
->sync_speed_max
= 0;
2325 max
= simple_strtoul(buf
, &e
, 10);
2326 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2328 mddev
->sync_speed_max
= max
;
2332 static struct md_sysfs_entry md_sync_max
=
2333 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2337 sync_speed_show(mddev_t
*mddev
, char *page
)
2339 unsigned long resync
, dt
, db
;
2340 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2341 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2343 db
= resync
- (mddev
->resync_mark_cnt
);
2344 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2347 static struct md_sysfs_entry
2348 md_sync_speed
= __ATTR_RO(sync_speed
);
2351 sync_completed_show(mddev_t
*mddev
, char *page
)
2353 unsigned long max_blocks
, resync
;
2355 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2356 max_blocks
= mddev
->resync_max_sectors
;
2358 max_blocks
= mddev
->size
<< 1;
2360 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2361 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2364 static struct md_sysfs_entry
2365 md_sync_completed
= __ATTR_RO(sync_completed
);
2368 suspend_lo_show(mddev_t
*mddev
, char *page
)
2370 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
2374 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2377 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2379 if (mddev
->pers
->quiesce
== NULL
)
2381 if (buf
== e
|| (*e
&& *e
!= '\n'))
2383 if (new >= mddev
->suspend_hi
||
2384 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
2385 mddev
->suspend_lo
= new;
2386 mddev
->pers
->quiesce(mddev
, 2);
2391 static struct md_sysfs_entry md_suspend_lo
=
2392 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
2396 suspend_hi_show(mddev_t
*mddev
, char *page
)
2398 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
2402 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2405 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2407 if (mddev
->pers
->quiesce
== NULL
)
2409 if (buf
== e
|| (*e
&& *e
!= '\n'))
2411 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
2412 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
2413 mddev
->suspend_hi
= new;
2414 mddev
->pers
->quiesce(mddev
, 1);
2415 mddev
->pers
->quiesce(mddev
, 0);
2420 static struct md_sysfs_entry md_suspend_hi
=
2421 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
2424 static struct attribute
*md_default_attrs
[] = {
2426 &md_raid_disks
.attr
,
2427 &md_chunk_size
.attr
,
2430 &md_new_device
.attr
,
2434 static struct attribute
*md_redundancy_attrs
[] = {
2436 &md_mismatches
.attr
,
2439 &md_sync_speed
.attr
,
2440 &md_sync_completed
.attr
,
2441 &md_suspend_lo
.attr
,
2442 &md_suspend_hi
.attr
,
2445 static struct attribute_group md_redundancy_group
= {
2447 .attrs
= md_redundancy_attrs
,
2452 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2454 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2455 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2461 rv
= entry
->show(mddev
, page
);
2462 mddev_unlock(mddev
);
2467 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2468 const char *page
, size_t length
)
2470 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2471 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2477 rv
= entry
->store(mddev
, page
, length
);
2478 mddev_unlock(mddev
);
2482 static void md_free(struct kobject
*ko
)
2484 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
2488 static struct sysfs_ops md_sysfs_ops
= {
2489 .show
= md_attr_show
,
2490 .store
= md_attr_store
,
2492 static struct kobj_type md_ktype
= {
2494 .sysfs_ops
= &md_sysfs_ops
,
2495 .default_attrs
= md_default_attrs
,
2500 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
2502 static DEFINE_MUTEX(disks_mutex
);
2503 mddev_t
*mddev
= mddev_find(dev
);
2504 struct gendisk
*disk
;
2505 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
2506 int shift
= partitioned
? MdpMinorShift
: 0;
2507 int unit
= MINOR(dev
) >> shift
;
2512 mutex_lock(&disks_mutex
);
2513 if (mddev
->gendisk
) {
2514 mutex_unlock(&disks_mutex
);
2518 disk
= alloc_disk(1 << shift
);
2520 mutex_unlock(&disks_mutex
);
2524 disk
->major
= MAJOR(dev
);
2525 disk
->first_minor
= unit
<< shift
;
2527 sprintf(disk
->disk_name
, "md_d%d", unit
);
2528 sprintf(disk
->devfs_name
, "md/d%d", unit
);
2530 sprintf(disk
->disk_name
, "md%d", unit
);
2531 sprintf(disk
->devfs_name
, "md/%d", unit
);
2533 disk
->fops
= &md_fops
;
2534 disk
->private_data
= mddev
;
2535 disk
->queue
= mddev
->queue
;
2537 mddev
->gendisk
= disk
;
2538 mutex_unlock(&disks_mutex
);
2539 mddev
->kobj
.parent
= &disk
->kobj
;
2540 mddev
->kobj
.k_name
= NULL
;
2541 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
2542 mddev
->kobj
.ktype
= &md_ktype
;
2543 kobject_register(&mddev
->kobj
);
2547 void md_wakeup_thread(mdk_thread_t
*thread
);
2549 static void md_safemode_timeout(unsigned long data
)
2551 mddev_t
*mddev
= (mddev_t
*) data
;
2553 mddev
->safemode
= 1;
2554 md_wakeup_thread(mddev
->thread
);
2557 static int start_dirty_degraded
;
2559 static int do_md_run(mddev_t
* mddev
)
2563 struct list_head
*tmp
;
2565 struct gendisk
*disk
;
2566 struct mdk_personality
*pers
;
2567 char b
[BDEVNAME_SIZE
];
2569 if (list_empty(&mddev
->disks
))
2570 /* cannot run an array with no devices.. */
2577 * Analyze all RAID superblock(s)
2579 if (!mddev
->raid_disks
)
2582 chunk_size
= mddev
->chunk_size
;
2585 if (chunk_size
> MAX_CHUNK_SIZE
) {
2586 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
2587 chunk_size
, MAX_CHUNK_SIZE
);
2591 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2593 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
2594 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
2597 if (chunk_size
< PAGE_SIZE
) {
2598 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
2599 chunk_size
, PAGE_SIZE
);
2603 /* devices must have minimum size of one chunk */
2604 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2605 if (test_bit(Faulty
, &rdev
->flags
))
2607 if (rdev
->size
< chunk_size
/ 1024) {
2609 "md: Dev %s smaller than chunk_size:"
2611 bdevname(rdev
->bdev
,b
),
2612 (unsigned long long)rdev
->size
,
2620 if (mddev
->level
!= LEVEL_NONE
)
2621 request_module("md-level-%d", mddev
->level
);
2622 else if (mddev
->clevel
[0])
2623 request_module("md-%s", mddev
->clevel
);
2627 * Drop all container device buffers, from now on
2628 * the only valid external interface is through the md
2630 * Also find largest hardsector size
2632 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2633 if (test_bit(Faulty
, &rdev
->flags
))
2635 sync_blockdev(rdev
->bdev
);
2636 invalidate_bdev(rdev
->bdev
, 0);
2639 md_probe(mddev
->unit
, NULL
, NULL
);
2640 disk
= mddev
->gendisk
;
2644 spin_lock(&pers_lock
);
2645 pers
= find_pers(mddev
->level
, mddev
->clevel
);
2646 if (!pers
|| !try_module_get(pers
->owner
)) {
2647 spin_unlock(&pers_lock
);
2648 if (mddev
->level
!= LEVEL_NONE
)
2649 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
2652 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
2657 spin_unlock(&pers_lock
);
2658 mddev
->level
= pers
->level
;
2659 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2661 if (mddev
->reshape_position
!= MaxSector
&&
2662 pers
->start_reshape
== NULL
) {
2663 /* This personality cannot handle reshaping... */
2665 module_put(pers
->owner
);
2669 mddev
->recovery
= 0;
2670 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
2671 mddev
->barriers_work
= 1;
2672 mddev
->ok_start_degraded
= start_dirty_degraded
;
2675 mddev
->ro
= 2; /* read-only, but switch on first write */
2677 err
= mddev
->pers
->run(mddev
);
2678 if (!err
&& mddev
->pers
->sync_request
) {
2679 err
= bitmap_create(mddev
);
2681 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
2682 mdname(mddev
), err
);
2683 mddev
->pers
->stop(mddev
);
2687 printk(KERN_ERR
"md: pers->run() failed ...\n");
2688 module_put(mddev
->pers
->owner
);
2690 bitmap_destroy(mddev
);
2693 if (mddev
->pers
->sync_request
)
2694 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
);
2695 else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
2698 atomic_set(&mddev
->writes_pending
,0);
2699 mddev
->safemode
= 0;
2700 mddev
->safemode_timer
.function
= md_safemode_timeout
;
2701 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
2702 mddev
->safemode_delay
= (20 * HZ
)/1000 +1; /* 20 msec delay */
2705 ITERATE_RDEV(mddev
,rdev
,tmp
)
2706 if (rdev
->raid_disk
>= 0) {
2708 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2709 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
2712 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2713 md_wakeup_thread(mddev
->thread
);
2715 if (mddev
->sb_dirty
)
2716 md_update_sb(mddev
);
2718 set_capacity(disk
, mddev
->array_size
<<1);
2720 /* If we call blk_queue_make_request here, it will
2721 * re-initialise max_sectors etc which may have been
2722 * refined inside -> run. So just set the bits we need to set.
2723 * Most initialisation happended when we called
2724 * blk_queue_make_request(..., md_fail_request)
2727 mddev
->queue
->queuedata
= mddev
;
2728 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
2731 md_new_event(mddev
);
2735 static int restart_array(mddev_t
*mddev
)
2737 struct gendisk
*disk
= mddev
->gendisk
;
2741 * Complain if it has no devices
2744 if (list_empty(&mddev
->disks
))
2752 mddev
->safemode
= 0;
2754 set_disk_ro(disk
, 0);
2756 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
2759 * Kick recovery or resync if necessary
2761 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2762 md_wakeup_thread(mddev
->thread
);
2765 printk(KERN_ERR
"md: %s has no personality assigned.\n",
2774 static int do_md_stop(mddev_t
* mddev
, int ro
)
2777 struct gendisk
*disk
= mddev
->gendisk
;
2780 if (atomic_read(&mddev
->active
)>2) {
2781 printk("md: %s still in use.\n",mdname(mddev
));
2785 if (mddev
->sync_thread
) {
2786 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2787 md_unregister_thread(mddev
->sync_thread
);
2788 mddev
->sync_thread
= NULL
;
2791 del_timer_sync(&mddev
->safemode_timer
);
2793 invalidate_partition(disk
, 0);
2801 bitmap_flush(mddev
);
2802 md_super_wait(mddev
);
2804 set_disk_ro(disk
, 0);
2805 blk_queue_make_request(mddev
->queue
, md_fail_request
);
2806 mddev
->pers
->stop(mddev
);
2807 if (mddev
->pers
->sync_request
)
2808 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
2810 module_put(mddev
->pers
->owner
);
2815 if (!mddev
->in_sync
) {
2816 /* mark array as shutdown cleanly */
2818 md_update_sb(mddev
);
2821 set_disk_ro(disk
, 1);
2825 * Free resources if final stop
2829 struct list_head
*tmp
;
2830 struct gendisk
*disk
;
2831 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
2833 bitmap_destroy(mddev
);
2834 if (mddev
->bitmap_file
) {
2835 atomic_set(&mddev
->bitmap_file
->f_dentry
->d_inode
->i_writecount
, 1);
2836 fput(mddev
->bitmap_file
);
2837 mddev
->bitmap_file
= NULL
;
2839 mddev
->bitmap_offset
= 0;
2841 ITERATE_RDEV(mddev
,rdev
,tmp
)
2842 if (rdev
->raid_disk
>= 0) {
2844 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2845 sysfs_remove_link(&mddev
->kobj
, nm
);
2848 export_array(mddev
);
2850 mddev
->array_size
= 0;
2851 disk
= mddev
->gendisk
;
2853 set_capacity(disk
, 0);
2856 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
2859 md_new_event(mddev
);
2864 static void autorun_array(mddev_t
*mddev
)
2867 struct list_head
*tmp
;
2870 if (list_empty(&mddev
->disks
))
2873 printk(KERN_INFO
"md: running: ");
2875 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2876 char b
[BDEVNAME_SIZE
];
2877 printk("<%s>", bdevname(rdev
->bdev
,b
));
2881 err
= do_md_run (mddev
);
2883 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
2884 do_md_stop (mddev
, 0);
2889 * lets try to run arrays based on all disks that have arrived
2890 * until now. (those are in pending_raid_disks)
2892 * the method: pick the first pending disk, collect all disks with
2893 * the same UUID, remove all from the pending list and put them into
2894 * the 'same_array' list. Then order this list based on superblock
2895 * update time (freshest comes first), kick out 'old' disks and
2896 * compare superblocks. If everything's fine then run it.
2898 * If "unit" is allocated, then bump its reference count
2900 static void autorun_devices(int part
)
2902 struct list_head
*tmp
;
2903 mdk_rdev_t
*rdev0
, *rdev
;
2905 char b
[BDEVNAME_SIZE
];
2907 printk(KERN_INFO
"md: autorun ...\n");
2908 while (!list_empty(&pending_raid_disks
)) {
2910 LIST_HEAD(candidates
);
2911 rdev0
= list_entry(pending_raid_disks
.next
,
2912 mdk_rdev_t
, same_set
);
2914 printk(KERN_INFO
"md: considering %s ...\n",
2915 bdevname(rdev0
->bdev
,b
));
2916 INIT_LIST_HEAD(&candidates
);
2917 ITERATE_RDEV_PENDING(rdev
,tmp
)
2918 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
2919 printk(KERN_INFO
"md: adding %s ...\n",
2920 bdevname(rdev
->bdev
,b
));
2921 list_move(&rdev
->same_set
, &candidates
);
2924 * now we have a set of devices, with all of them having
2925 * mostly sane superblocks. It's time to allocate the
2928 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
2929 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
2930 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
2934 dev
= MKDEV(mdp_major
,
2935 rdev0
->preferred_minor
<< MdpMinorShift
);
2937 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
2939 md_probe(dev
, NULL
, NULL
);
2940 mddev
= mddev_find(dev
);
2943 "md: cannot allocate memory for md drive.\n");
2946 if (mddev_lock(mddev
))
2947 printk(KERN_WARNING
"md: %s locked, cannot run\n",
2949 else if (mddev
->raid_disks
|| mddev
->major_version
2950 || !list_empty(&mddev
->disks
)) {
2952 "md: %s already running, cannot run %s\n",
2953 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
2954 mddev_unlock(mddev
);
2956 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
2957 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
2958 list_del_init(&rdev
->same_set
);
2959 if (bind_rdev_to_array(rdev
, mddev
))
2962 autorun_array(mddev
);
2963 mddev_unlock(mddev
);
2965 /* on success, candidates will be empty, on error
2968 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
2972 printk(KERN_INFO
"md: ... autorun DONE.\n");
2976 * import RAID devices based on one partition
2977 * if possible, the array gets run as well.
2980 static int autostart_array(dev_t startdev
)
2982 char b
[BDEVNAME_SIZE
];
2983 int err
= -EINVAL
, i
;
2984 mdp_super_t
*sb
= NULL
;
2985 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
2987 start_rdev
= md_import_device(startdev
, 0, 0);
2988 if (IS_ERR(start_rdev
))
2992 /* NOTE: this can only work for 0.90.0 superblocks */
2993 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
2994 if (sb
->major_version
!= 0 ||
2995 sb
->minor_version
!= 90 ) {
2996 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
2997 export_rdev(start_rdev
);
3001 if (test_bit(Faulty
, &start_rdev
->flags
)) {
3003 "md: can not autostart based on faulty %s!\n",
3004 bdevname(start_rdev
->bdev
,b
));
3005 export_rdev(start_rdev
);
3008 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
3010 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
3011 mdp_disk_t
*desc
= sb
->disks
+ i
;
3012 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
3016 if (dev
== startdev
)
3018 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
3020 rdev
= md_import_device(dev
, 0, 0);
3024 list_add(&rdev
->same_set
, &pending_raid_disks
);
3028 * possibly return codes
3036 static int get_version(void __user
* arg
)
3040 ver
.major
= MD_MAJOR_VERSION
;
3041 ver
.minor
= MD_MINOR_VERSION
;
3042 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3044 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3050 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3052 mdu_array_info_t info
;
3053 int nr
,working
,active
,failed
,spare
;
3055 struct list_head
*tmp
;
3057 nr
=working
=active
=failed
=spare
=0;
3058 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3060 if (test_bit(Faulty
, &rdev
->flags
))
3064 if (test_bit(In_sync
, &rdev
->flags
))
3071 info
.major_version
= mddev
->major_version
;
3072 info
.minor_version
= mddev
->minor_version
;
3073 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3074 info
.ctime
= mddev
->ctime
;
3075 info
.level
= mddev
->level
;
3076 info
.size
= mddev
->size
;
3077 if (info
.size
!= mddev
->size
) /* overflow */
3080 info
.raid_disks
= mddev
->raid_disks
;
3081 info
.md_minor
= mddev
->md_minor
;
3082 info
.not_persistent
= !mddev
->persistent
;
3084 info
.utime
= mddev
->utime
;
3087 info
.state
= (1<<MD_SB_CLEAN
);
3088 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3089 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3090 info
.active_disks
= active
;
3091 info
.working_disks
= working
;
3092 info
.failed_disks
= failed
;
3093 info
.spare_disks
= spare
;
3095 info
.layout
= mddev
->layout
;
3096 info
.chunk_size
= mddev
->chunk_size
;
3098 if (copy_to_user(arg
, &info
, sizeof(info
)))
3104 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3106 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3107 char *ptr
, *buf
= NULL
;
3110 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3114 /* bitmap disabled, zero the first byte and copy out */
3115 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3116 file
->pathname
[0] = '\0';
3120 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3124 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3128 strcpy(file
->pathname
, ptr
);
3132 if (copy_to_user(arg
, file
, sizeof(*file
)))
3140 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3142 mdu_disk_info_t info
;
3146 if (copy_from_user(&info
, arg
, sizeof(info
)))
3151 rdev
= find_rdev_nr(mddev
, nr
);
3153 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3154 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3155 info
.raid_disk
= rdev
->raid_disk
;
3157 if (test_bit(Faulty
, &rdev
->flags
))
3158 info
.state
|= (1<<MD_DISK_FAULTY
);
3159 else if (test_bit(In_sync
, &rdev
->flags
)) {
3160 info
.state
|= (1<<MD_DISK_ACTIVE
);
3161 info
.state
|= (1<<MD_DISK_SYNC
);
3163 if (test_bit(WriteMostly
, &rdev
->flags
))
3164 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3166 info
.major
= info
.minor
= 0;
3167 info
.raid_disk
= -1;
3168 info
.state
= (1<<MD_DISK_REMOVED
);
3171 if (copy_to_user(arg
, &info
, sizeof(info
)))
3177 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3179 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3181 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3183 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3186 if (!mddev
->raid_disks
) {
3188 /* expecting a device which has a superblock */
3189 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3192 "md: md_import_device returned %ld\n",
3194 return PTR_ERR(rdev
);
3196 if (!list_empty(&mddev
->disks
)) {
3197 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3198 mdk_rdev_t
, same_set
);
3199 int err
= super_types
[mddev
->major_version
]
3200 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3203 "md: %s has different UUID to %s\n",
3204 bdevname(rdev
->bdev
,b
),
3205 bdevname(rdev0
->bdev
,b2
));
3210 err
= bind_rdev_to_array(rdev
, mddev
);
3217 * add_new_disk can be used once the array is assembled
3218 * to add "hot spares". They must already have a superblock
3223 if (!mddev
->pers
->hot_add_disk
) {
3225 "%s: personality does not support diskops!\n",
3229 if (mddev
->persistent
)
3230 rdev
= md_import_device(dev
, mddev
->major_version
,
3231 mddev
->minor_version
);
3233 rdev
= md_import_device(dev
, -1, -1);
3236 "md: md_import_device returned %ld\n",
3238 return PTR_ERR(rdev
);
3240 /* set save_raid_disk if appropriate */
3241 if (!mddev
->persistent
) {
3242 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3243 info
->raid_disk
< mddev
->raid_disks
)
3244 rdev
->raid_disk
= info
->raid_disk
;
3246 rdev
->raid_disk
= -1;
3248 super_types
[mddev
->major_version
].
3249 validate_super(mddev
, rdev
);
3250 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3252 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3253 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3254 set_bit(WriteMostly
, &rdev
->flags
);
3256 rdev
->raid_disk
= -1;
3257 err
= bind_rdev_to_array(rdev
, mddev
);
3261 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3262 md_wakeup_thread(mddev
->thread
);
3266 /* otherwise, add_new_disk is only allowed
3267 * for major_version==0 superblocks
3269 if (mddev
->major_version
!= 0) {
3270 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3275 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3277 rdev
= md_import_device (dev
, -1, 0);
3280 "md: error, md_import_device() returned %ld\n",
3282 return PTR_ERR(rdev
);
3284 rdev
->desc_nr
= info
->number
;
3285 if (info
->raid_disk
< mddev
->raid_disks
)
3286 rdev
->raid_disk
= info
->raid_disk
;
3288 rdev
->raid_disk
= -1;
3292 if (rdev
->raid_disk
< mddev
->raid_disks
)
3293 if (info
->state
& (1<<MD_DISK_SYNC
))
3294 set_bit(In_sync
, &rdev
->flags
);
3296 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3297 set_bit(WriteMostly
, &rdev
->flags
);
3299 if (!mddev
->persistent
) {
3300 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3301 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3303 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3304 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3306 err
= bind_rdev_to_array(rdev
, mddev
);
3316 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3318 char b
[BDEVNAME_SIZE
];
3324 rdev
= find_rdev(mddev
, dev
);
3328 if (rdev
->raid_disk
>= 0)
3331 kick_rdev_from_array(rdev
);
3332 md_update_sb(mddev
);
3333 md_new_event(mddev
);
3337 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3338 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3342 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3344 char b
[BDEVNAME_SIZE
];
3352 if (mddev
->major_version
!= 0) {
3353 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3354 " version-0 superblocks.\n",
3358 if (!mddev
->pers
->hot_add_disk
) {
3360 "%s: personality does not support diskops!\n",
3365 rdev
= md_import_device (dev
, -1, 0);
3368 "md: error, md_import_device() returned %ld\n",
3373 if (mddev
->persistent
)
3374 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3377 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3379 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3382 if (test_bit(Faulty
, &rdev
->flags
)) {
3384 "md: can not hot-add faulty %s disk to %s!\n",
3385 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3389 clear_bit(In_sync
, &rdev
->flags
);
3391 err
= bind_rdev_to_array(rdev
, mddev
);
3396 * The rest should better be atomic, we can have disk failures
3397 * noticed in interrupt contexts ...
3400 if (rdev
->desc_nr
== mddev
->max_disks
) {
3401 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
3404 goto abort_unbind_export
;
3407 rdev
->raid_disk
= -1;
3409 md_update_sb(mddev
);
3412 * Kick recovery, maybe this spare has to be added to the
3413 * array immediately.
3415 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3416 md_wakeup_thread(mddev
->thread
);
3417 md_new_event(mddev
);
3420 abort_unbind_export
:
3421 unbind_rdev_from_array(rdev
);
3428 /* similar to deny_write_access, but accounts for our holding a reference
3429 * to the file ourselves */
3430 static int deny_bitmap_write_access(struct file
* file
)
3432 struct inode
*inode
= file
->f_mapping
->host
;
3434 spin_lock(&inode
->i_lock
);
3435 if (atomic_read(&inode
->i_writecount
) > 1) {
3436 spin_unlock(&inode
->i_lock
);
3439 atomic_set(&inode
->i_writecount
, -1);
3440 spin_unlock(&inode
->i_lock
);
3445 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
3450 if (!mddev
->pers
->quiesce
)
3452 if (mddev
->recovery
|| mddev
->sync_thread
)
3454 /* we should be able to change the bitmap.. */
3460 return -EEXIST
; /* cannot add when bitmap is present */
3461 mddev
->bitmap_file
= fget(fd
);
3463 if (mddev
->bitmap_file
== NULL
) {
3464 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
3469 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
3471 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
3473 fput(mddev
->bitmap_file
);
3474 mddev
->bitmap_file
= NULL
;
3477 mddev
->bitmap_offset
= 0; /* file overrides offset */
3478 } else if (mddev
->bitmap
== NULL
)
3479 return -ENOENT
; /* cannot remove what isn't there */
3482 mddev
->pers
->quiesce(mddev
, 1);
3484 err
= bitmap_create(mddev
);
3486 bitmap_destroy(mddev
);
3487 mddev
->pers
->quiesce(mddev
, 0);
3488 } else if (fd
< 0) {
3489 if (mddev
->bitmap_file
)
3490 fput(mddev
->bitmap_file
);
3491 mddev
->bitmap_file
= NULL
;
3498 * set_array_info is used two different ways
3499 * The original usage is when creating a new array.
3500 * In this usage, raid_disks is > 0 and it together with
3501 * level, size, not_persistent,layout,chunksize determine the
3502 * shape of the array.
3503 * This will always create an array with a type-0.90.0 superblock.
3504 * The newer usage is when assembling an array.
3505 * In this case raid_disks will be 0, and the major_version field is
3506 * use to determine which style super-blocks are to be found on the devices.
3507 * The minor and patch _version numbers are also kept incase the
3508 * super_block handler wishes to interpret them.
3510 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
3513 if (info
->raid_disks
== 0) {
3514 /* just setting version number for superblock loading */
3515 if (info
->major_version
< 0 ||
3516 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
3517 super_types
[info
->major_version
].name
== NULL
) {
3518 /* maybe try to auto-load a module? */
3520 "md: superblock version %d not known\n",
3521 info
->major_version
);
3524 mddev
->major_version
= info
->major_version
;
3525 mddev
->minor_version
= info
->minor_version
;
3526 mddev
->patch_version
= info
->patch_version
;
3529 mddev
->major_version
= MD_MAJOR_VERSION
;
3530 mddev
->minor_version
= MD_MINOR_VERSION
;
3531 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
3532 mddev
->ctime
= get_seconds();
3534 mddev
->level
= info
->level
;
3535 mddev
->clevel
[0] = 0;
3536 mddev
->size
= info
->size
;
3537 mddev
->raid_disks
= info
->raid_disks
;
3538 /* don't set md_minor, it is determined by which /dev/md* was
3541 if (info
->state
& (1<<MD_SB_CLEAN
))
3542 mddev
->recovery_cp
= MaxSector
;
3544 mddev
->recovery_cp
= 0;
3545 mddev
->persistent
= ! info
->not_persistent
;
3547 mddev
->layout
= info
->layout
;
3548 mddev
->chunk_size
= info
->chunk_size
;
3550 mddev
->max_disks
= MD_SB_DISKS
;
3552 mddev
->sb_dirty
= 1;
3554 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
3555 mddev
->bitmap_offset
= 0;
3557 mddev
->reshape_position
= MaxSector
;
3560 * Generate a 128 bit UUID
3562 get_random_bytes(mddev
->uuid
, 16);
3564 mddev
->new_level
= mddev
->level
;
3565 mddev
->new_chunk
= mddev
->chunk_size
;
3566 mddev
->new_layout
= mddev
->layout
;
3567 mddev
->delta_disks
= 0;
3572 static int update_size(mddev_t
*mddev
, unsigned long size
)
3576 struct list_head
*tmp
;
3577 int fit
= (size
== 0);
3579 if (mddev
->pers
->resize
== NULL
)
3581 /* The "size" is the amount of each device that is used.
3582 * This can only make sense for arrays with redundancy.
3583 * linear and raid0 always use whatever space is available
3584 * We can only consider changing the size if no resync
3585 * or reconstruction is happening, and if the new size
3586 * is acceptable. It must fit before the sb_offset or,
3587 * if that is <data_offset, it must fit before the
3588 * size of each device.
3589 * If size is zero, we find the largest size that fits.
3591 if (mddev
->sync_thread
)
3593 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3595 if (rdev
->sb_offset
> rdev
->data_offset
)
3596 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
3598 avail
= get_capacity(rdev
->bdev
->bd_disk
)
3599 - rdev
->data_offset
;
3600 if (fit
&& (size
== 0 || size
> avail
/2))
3602 if (avail
< ((sector_t
)size
<< 1))
3605 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
3607 struct block_device
*bdev
;
3609 bdev
= bdget_disk(mddev
->gendisk
, 0);
3611 mutex_lock(&bdev
->bd_inode
->i_mutex
);
3612 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
3613 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
3620 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
3623 /* change the number of raid disks */
3624 if (mddev
->pers
->check_reshape
== NULL
)
3626 if (raid_disks
<= 0 ||
3627 raid_disks
>= mddev
->max_disks
)
3629 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
3631 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
3633 rv
= mddev
->pers
->check_reshape(mddev
);
3639 * update_array_info is used to change the configuration of an
3641 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3642 * fields in the info are checked against the array.
3643 * Any differences that cannot be handled will cause an error.
3644 * Normally, only one change can be managed at a time.
3646 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
3652 /* calculate expected state,ignoring low bits */
3653 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3654 state
|= (1 << MD_SB_BITMAP_PRESENT
);
3656 if (mddev
->major_version
!= info
->major_version
||
3657 mddev
->minor_version
!= info
->minor_version
||
3658 /* mddev->patch_version != info->patch_version || */
3659 mddev
->ctime
!= info
->ctime
||
3660 mddev
->level
!= info
->level
||
3661 /* mddev->layout != info->layout || */
3662 !mddev
->persistent
!= info
->not_persistent
||
3663 mddev
->chunk_size
!= info
->chunk_size
||
3664 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3665 ((state
^info
->state
) & 0xfffffe00)
3668 /* Check there is only one change */
3669 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
3670 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
3671 if (mddev
->layout
!= info
->layout
) cnt
++;
3672 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
3673 if (cnt
== 0) return 0;
3674 if (cnt
> 1) return -EINVAL
;
3676 if (mddev
->layout
!= info
->layout
) {
3678 * we don't need to do anything at the md level, the
3679 * personality will take care of it all.
3681 if (mddev
->pers
->reconfig
== NULL
)
3684 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
3686 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
3687 rv
= update_size(mddev
, info
->size
);
3689 if (mddev
->raid_disks
!= info
->raid_disks
)
3690 rv
= update_raid_disks(mddev
, info
->raid_disks
);
3692 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
3693 if (mddev
->pers
->quiesce
== NULL
)
3695 if (mddev
->recovery
|| mddev
->sync_thread
)
3697 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
3698 /* add the bitmap */
3701 if (mddev
->default_bitmap_offset
== 0)
3703 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
3704 mddev
->pers
->quiesce(mddev
, 1);
3705 rv
= bitmap_create(mddev
);
3707 bitmap_destroy(mddev
);
3708 mddev
->pers
->quiesce(mddev
, 0);
3710 /* remove the bitmap */
3713 if (mddev
->bitmap
->file
)
3715 mddev
->pers
->quiesce(mddev
, 1);
3716 bitmap_destroy(mddev
);
3717 mddev
->pers
->quiesce(mddev
, 0);
3718 mddev
->bitmap_offset
= 0;
3721 md_update_sb(mddev
);
3725 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
3729 if (mddev
->pers
== NULL
)
3732 rdev
= find_rdev(mddev
, dev
);
3736 md_error(mddev
, rdev
);
3740 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
3742 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
3746 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
3750 static int md_ioctl(struct inode
*inode
, struct file
*file
,
3751 unsigned int cmd
, unsigned long arg
)
3754 void __user
*argp
= (void __user
*)arg
;
3755 mddev_t
*mddev
= NULL
;
3757 if (!capable(CAP_SYS_ADMIN
))
3761 * Commands dealing with the RAID driver but not any
3767 err
= get_version(argp
);
3770 case PRINT_RAID_DEBUG
:
3778 autostart_arrays(arg
);
3785 * Commands creating/starting a new array:
3788 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
3796 if (cmd
== START_ARRAY
) {
3797 /* START_ARRAY doesn't need to lock the array as autostart_array
3798 * does the locking, and it could even be a different array
3803 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3804 "This will not be supported beyond July 2006\n",
3805 current
->comm
, current
->pid
);
3808 err
= autostart_array(new_decode_dev(arg
));
3810 printk(KERN_WARNING
"md: autostart failed!\n");
3816 err
= mddev_lock(mddev
);
3819 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3826 case SET_ARRAY_INFO
:
3828 mdu_array_info_t info
;
3830 memset(&info
, 0, sizeof(info
));
3831 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
3836 err
= update_array_info(mddev
, &info
);
3838 printk(KERN_WARNING
"md: couldn't update"
3839 " array info. %d\n", err
);
3844 if (!list_empty(&mddev
->disks
)) {
3846 "md: array %s already has disks!\n",
3851 if (mddev
->raid_disks
) {
3853 "md: array %s already initialised!\n",
3858 err
= set_array_info(mddev
, &info
);
3860 printk(KERN_WARNING
"md: couldn't set"
3861 " array info. %d\n", err
);
3871 * Commands querying/configuring an existing array:
3873 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3874 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3875 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
3876 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
3882 * Commands even a read-only array can execute:
3886 case GET_ARRAY_INFO
:
3887 err
= get_array_info(mddev
, argp
);
3890 case GET_BITMAP_FILE
:
3891 err
= get_bitmap_file(mddev
, argp
);
3895 err
= get_disk_info(mddev
, argp
);
3898 case RESTART_ARRAY_RW
:
3899 err
= restart_array(mddev
);
3903 err
= do_md_stop (mddev
, 0);
3907 err
= do_md_stop (mddev
, 1);
3911 * We have a problem here : there is no easy way to give a CHS
3912 * virtual geometry. We currently pretend that we have a 2 heads
3913 * 4 sectors (with a BIG number of cylinders...). This drives
3914 * dosfs just mad... ;-)
3919 * The remaining ioctls are changing the state of the
3920 * superblock, so we do not allow them on read-only arrays.
3921 * However non-MD ioctls (e.g. get-size) will still come through
3922 * here and hit the 'default' below, so only disallow
3923 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3925 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
3926 mddev
->ro
&& mddev
->pers
) {
3927 if (mddev
->ro
== 2) {
3929 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3930 md_wakeup_thread(mddev
->thread
);
3942 mdu_disk_info_t info
;
3943 if (copy_from_user(&info
, argp
, sizeof(info
)))
3946 err
= add_new_disk(mddev
, &info
);
3950 case HOT_REMOVE_DISK
:
3951 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
3955 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
3958 case SET_DISK_FAULTY
:
3959 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
3963 err
= do_md_run (mddev
);
3966 case SET_BITMAP_FILE
:
3967 err
= set_bitmap_file(mddev
, (int)arg
);
3971 if (_IOC_TYPE(cmd
) == MD_MAJOR
)
3972 printk(KERN_WARNING
"md: %s(pid %d) used"
3973 " obsolete MD ioctl, upgrade your"
3974 " software to use new ictls.\n",
3975 current
->comm
, current
->pid
);
3982 mddev_unlock(mddev
);
3992 static int md_open(struct inode
*inode
, struct file
*file
)
3995 * Succeed if we can lock the mddev, which confirms that
3996 * it isn't being stopped right now.
3998 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4001 if ((err
= mddev_lock(mddev
)))
4006 mddev_unlock(mddev
);
4008 check_disk_change(inode
->i_bdev
);
4013 static int md_release(struct inode
*inode
, struct file
* file
)
4015 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4024 static int md_media_changed(struct gendisk
*disk
)
4026 mddev_t
*mddev
= disk
->private_data
;
4028 return mddev
->changed
;
4031 static int md_revalidate(struct gendisk
*disk
)
4033 mddev_t
*mddev
= disk
->private_data
;
4038 static struct block_device_operations md_fops
=
4040 .owner
= THIS_MODULE
,
4042 .release
= md_release
,
4044 .getgeo
= md_getgeo
,
4045 .media_changed
= md_media_changed
,
4046 .revalidate_disk
= md_revalidate
,
4049 static int md_thread(void * arg
)
4051 mdk_thread_t
*thread
= arg
;
4054 * md_thread is a 'system-thread', it's priority should be very
4055 * high. We avoid resource deadlocks individually in each
4056 * raid personality. (RAID5 does preallocation) We also use RR and
4057 * the very same RT priority as kswapd, thus we will never get
4058 * into a priority inversion deadlock.
4060 * we definitely have to have equal or higher priority than
4061 * bdflush, otherwise bdflush will deadlock if there are too
4062 * many dirty RAID5 blocks.
4065 allow_signal(SIGKILL
);
4066 while (!kthread_should_stop()) {
4068 /* We need to wait INTERRUPTIBLE so that
4069 * we don't add to the load-average.
4070 * That means we need to be sure no signals are
4073 if (signal_pending(current
))
4074 flush_signals(current
);
4076 wait_event_interruptible_timeout
4078 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4079 || kthread_should_stop(),
4083 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4085 thread
->run(thread
->mddev
);
4091 void md_wakeup_thread(mdk_thread_t
*thread
)
4094 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4095 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4096 wake_up(&thread
->wqueue
);
4100 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4103 mdk_thread_t
*thread
;
4105 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4109 init_waitqueue_head(&thread
->wqueue
);
4112 thread
->mddev
= mddev
;
4113 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4114 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4115 if (IS_ERR(thread
->tsk
)) {
4122 void md_unregister_thread(mdk_thread_t
*thread
)
4124 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
4126 kthread_stop(thread
->tsk
);
4130 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4137 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4140 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4142 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4143 __builtin_return_address(0),__builtin_return_address(1),
4144 __builtin_return_address(2),__builtin_return_address(3));
4146 if (!mddev
->pers
->error_handler
)
4148 mddev
->pers
->error_handler(mddev
,rdev
);
4149 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4150 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4151 md_wakeup_thread(mddev
->thread
);
4152 md_new_event(mddev
);
4155 /* seq_file implementation /proc/mdstat */
4157 static void status_unused(struct seq_file
*seq
)
4161 struct list_head
*tmp
;
4163 seq_printf(seq
, "unused devices: ");
4165 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4166 char b
[BDEVNAME_SIZE
];
4168 seq_printf(seq
, "%s ",
4169 bdevname(rdev
->bdev
,b
));
4172 seq_printf(seq
, "<none>");
4174 seq_printf(seq
, "\n");
4178 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4180 sector_t max_blocks
, resync
, res
;
4181 unsigned long dt
, db
, rt
;
4183 unsigned int per_milli
;
4185 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4187 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4188 max_blocks
= mddev
->resync_max_sectors
>> 1;
4190 max_blocks
= mddev
->size
;
4193 * Should not happen.
4199 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4200 * in a sector_t, and (max_blocks>>scale) will fit in a
4201 * u32, as those are the requirements for sector_div.
4202 * Thus 'scale' must be at least 10
4205 if (sizeof(sector_t
) > sizeof(unsigned long)) {
4206 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
4209 res
= (resync
>>scale
)*1000;
4210 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
4214 int i
, x
= per_milli
/50, y
= 20-x
;
4215 seq_printf(seq
, "[");
4216 for (i
= 0; i
< x
; i
++)
4217 seq_printf(seq
, "=");
4218 seq_printf(seq
, ">");
4219 for (i
= 0; i
< y
; i
++)
4220 seq_printf(seq
, ".");
4221 seq_printf(seq
, "] ");
4223 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
4224 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
4226 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4227 "resync" : "recovery")),
4228 per_milli
/10, per_milli
% 10,
4229 (unsigned long long) resync
,
4230 (unsigned long long) max_blocks
);
4233 * We do not want to overflow, so the order of operands and
4234 * the * 100 / 100 trick are important. We do a +1 to be
4235 * safe against division by zero. We only estimate anyway.
4237 * dt: time from mark until now
4238 * db: blocks written from mark until now
4239 * rt: remaining time
4241 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4243 db
= resync
- (mddev
->resync_mark_cnt
/2);
4244 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/100+1)))/100;
4246 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4248 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
4251 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4253 struct list_head
*tmp
;
4263 spin_lock(&all_mddevs_lock
);
4264 list_for_each(tmp
,&all_mddevs
)
4266 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4268 spin_unlock(&all_mddevs_lock
);
4271 spin_unlock(&all_mddevs_lock
);
4273 return (void*)2;/* tail */
4277 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4279 struct list_head
*tmp
;
4280 mddev_t
*next_mddev
, *mddev
= v
;
4286 spin_lock(&all_mddevs_lock
);
4288 tmp
= all_mddevs
.next
;
4290 tmp
= mddev
->all_mddevs
.next
;
4291 if (tmp
!= &all_mddevs
)
4292 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4294 next_mddev
= (void*)2;
4297 spin_unlock(&all_mddevs_lock
);
4305 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4309 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4313 struct mdstat_info
{
4317 static int md_seq_show(struct seq_file
*seq
, void *v
)
4321 struct list_head
*tmp2
;
4323 struct mdstat_info
*mi
= seq
->private;
4324 struct bitmap
*bitmap
;
4326 if (v
== (void*)1) {
4327 struct mdk_personality
*pers
;
4328 seq_printf(seq
, "Personalities : ");
4329 spin_lock(&pers_lock
);
4330 list_for_each_entry(pers
, &pers_list
, list
)
4331 seq_printf(seq
, "[%s] ", pers
->name
);
4333 spin_unlock(&pers_lock
);
4334 seq_printf(seq
, "\n");
4335 mi
->event
= atomic_read(&md_event_count
);
4338 if (v
== (void*)2) {
4343 if (mddev_lock(mddev
)!=0)
4345 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4346 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4347 mddev
->pers
? "" : "in");
4350 seq_printf(seq
, " (read-only)");
4352 seq_printf(seq
, "(auto-read-only)");
4353 seq_printf(seq
, " %s", mddev
->pers
->name
);
4357 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4358 char b
[BDEVNAME_SIZE
];
4359 seq_printf(seq
, " %s[%d]",
4360 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4361 if (test_bit(WriteMostly
, &rdev
->flags
))
4362 seq_printf(seq
, "(W)");
4363 if (test_bit(Faulty
, &rdev
->flags
)) {
4364 seq_printf(seq
, "(F)");
4366 } else if (rdev
->raid_disk
< 0)
4367 seq_printf(seq
, "(S)"); /* spare */
4371 if (!list_empty(&mddev
->disks
)) {
4373 seq_printf(seq
, "\n %llu blocks",
4374 (unsigned long long)mddev
->array_size
);
4376 seq_printf(seq
, "\n %llu blocks",
4377 (unsigned long long)size
);
4379 if (mddev
->persistent
) {
4380 if (mddev
->major_version
!= 0 ||
4381 mddev
->minor_version
!= 90) {
4382 seq_printf(seq
," super %d.%d",
4383 mddev
->major_version
,
4384 mddev
->minor_version
);
4387 seq_printf(seq
, " super non-persistent");
4390 mddev
->pers
->status (seq
, mddev
);
4391 seq_printf(seq
, "\n ");
4392 if (mddev
->pers
->sync_request
) {
4393 if (mddev
->curr_resync
> 2) {
4394 status_resync (seq
, mddev
);
4395 seq_printf(seq
, "\n ");
4396 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4397 seq_printf(seq
, "\tresync=DELAYED\n ");
4398 else if (mddev
->recovery_cp
< MaxSector
)
4399 seq_printf(seq
, "\tresync=PENDING\n ");
4402 seq_printf(seq
, "\n ");
4404 if ((bitmap
= mddev
->bitmap
)) {
4405 unsigned long chunk_kb
;
4406 unsigned long flags
;
4407 spin_lock_irqsave(&bitmap
->lock
, flags
);
4408 chunk_kb
= bitmap
->chunksize
>> 10;
4409 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4411 bitmap
->pages
- bitmap
->missing_pages
,
4413 (bitmap
->pages
- bitmap
->missing_pages
)
4414 << (PAGE_SHIFT
- 10),
4415 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
4416 chunk_kb
? "KB" : "B");
4418 seq_printf(seq
, ", file: ");
4419 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
4420 bitmap
->file
->f_dentry
," \t\n");
4423 seq_printf(seq
, "\n");
4424 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
4427 seq_printf(seq
, "\n");
4429 mddev_unlock(mddev
);
4434 static struct seq_operations md_seq_ops
= {
4435 .start
= md_seq_start
,
4436 .next
= md_seq_next
,
4437 .stop
= md_seq_stop
,
4438 .show
= md_seq_show
,
4441 static int md_seq_open(struct inode
*inode
, struct file
*file
)
4444 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
4448 error
= seq_open(file
, &md_seq_ops
);
4452 struct seq_file
*p
= file
->private_data
;
4454 mi
->event
= atomic_read(&md_event_count
);
4459 static int md_seq_release(struct inode
*inode
, struct file
*file
)
4461 struct seq_file
*m
= file
->private_data
;
4462 struct mdstat_info
*mi
= m
->private;
4465 return seq_release(inode
, file
);
4468 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
4470 struct seq_file
*m
= filp
->private_data
;
4471 struct mdstat_info
*mi
= m
->private;
4474 poll_wait(filp
, &md_event_waiters
, wait
);
4476 /* always allow read */
4477 mask
= POLLIN
| POLLRDNORM
;
4479 if (mi
->event
!= atomic_read(&md_event_count
))
4480 mask
|= POLLERR
| POLLPRI
;
4484 static struct file_operations md_seq_fops
= {
4485 .open
= md_seq_open
,
4487 .llseek
= seq_lseek
,
4488 .release
= md_seq_release
,
4489 .poll
= mdstat_poll
,
4492 int register_md_personality(struct mdk_personality
*p
)
4494 spin_lock(&pers_lock
);
4495 list_add_tail(&p
->list
, &pers_list
);
4496 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
4497 spin_unlock(&pers_lock
);
4501 int unregister_md_personality(struct mdk_personality
*p
)
4503 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
4504 spin_lock(&pers_lock
);
4505 list_del_init(&p
->list
);
4506 spin_unlock(&pers_lock
);
4510 static int is_mddev_idle(mddev_t
*mddev
)
4513 struct list_head
*tmp
;
4515 unsigned long curr_events
;
4518 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4519 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
4520 curr_events
= disk_stat_read(disk
, sectors
[0]) +
4521 disk_stat_read(disk
, sectors
[1]) -
4522 atomic_read(&disk
->sync_io
);
4523 /* The difference between curr_events and last_events
4524 * will be affected by any new non-sync IO (making
4525 * curr_events bigger) and any difference in the amount of
4526 * in-flight syncio (making current_events bigger or smaller)
4527 * The amount in-flight is currently limited to
4528 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4529 * which is at most 4096 sectors.
4530 * These numbers are fairly fragile and should be made
4531 * more robust, probably by enforcing the
4532 * 'window size' that md_do_sync sort-of uses.
4534 * Note: the following is an unsigned comparison.
4536 if ((curr_events
- rdev
->last_events
+ 4096) > 8192) {
4537 rdev
->last_events
= curr_events
;
4544 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
4546 /* another "blocks" (512byte) blocks have been synced */
4547 atomic_sub(blocks
, &mddev
->recovery_active
);
4548 wake_up(&mddev
->recovery_wait
);
4550 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4551 md_wakeup_thread(mddev
->thread
);
4552 // stop recovery, signal do_sync ....
4557 /* md_write_start(mddev, bi)
4558 * If we need to update some array metadata (e.g. 'active' flag
4559 * in superblock) before writing, schedule a superblock update
4560 * and wait for it to complete.
4562 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
4564 if (bio_data_dir(bi
) != WRITE
)
4567 BUG_ON(mddev
->ro
== 1);
4568 if (mddev
->ro
== 2) {
4569 /* need to switch to read/write */
4571 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4572 md_wakeup_thread(mddev
->thread
);
4574 atomic_inc(&mddev
->writes_pending
);
4575 if (mddev
->in_sync
) {
4576 spin_lock_irq(&mddev
->write_lock
);
4577 if (mddev
->in_sync
) {
4579 mddev
->sb_dirty
= 1;
4580 md_wakeup_thread(mddev
->thread
);
4582 spin_unlock_irq(&mddev
->write_lock
);
4584 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
4587 void md_write_end(mddev_t
*mddev
)
4589 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
4590 if (mddev
->safemode
== 2)
4591 md_wakeup_thread(mddev
->thread
);
4593 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
4597 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
4599 #define SYNC_MARKS 10
4600 #define SYNC_MARK_STEP (3*HZ)
4601 void md_do_sync(mddev_t
*mddev
)
4604 unsigned int currspeed
= 0,
4606 sector_t max_sectors
,j
, io_sectors
;
4607 unsigned long mark
[SYNC_MARKS
];
4608 sector_t mark_cnt
[SYNC_MARKS
];
4610 struct list_head
*tmp
;
4611 sector_t last_check
;
4614 /* just incase thread restarts... */
4615 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
4618 /* we overload curr_resync somewhat here.
4619 * 0 == not engaged in resync at all
4620 * 2 == checking that there is no conflict with another sync
4621 * 1 == like 2, but have yielded to allow conflicting resync to
4623 * other == active in resync - this many blocks
4625 * Before starting a resync we must have set curr_resync to
4626 * 2, and then checked that every "conflicting" array has curr_resync
4627 * less than ours. When we find one that is the same or higher
4628 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4629 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4630 * This will mean we have to start checking from the beginning again.
4635 mddev
->curr_resync
= 2;
4638 if (kthread_should_stop()) {
4639 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4642 ITERATE_MDDEV(mddev2
,tmp
) {
4643 if (mddev2
== mddev
)
4645 if (mddev2
->curr_resync
&&
4646 match_mddev_units(mddev
,mddev2
)) {
4648 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
4649 /* arbitrarily yield */
4650 mddev
->curr_resync
= 1;
4651 wake_up(&resync_wait
);
4653 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
4654 /* no need to wait here, we can wait the next
4655 * time 'round when curr_resync == 2
4658 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
4659 if (!kthread_should_stop() &&
4660 mddev2
->curr_resync
>= mddev
->curr_resync
) {
4661 printk(KERN_INFO
"md: delaying resync of %s"
4662 " until %s has finished resync (they"
4663 " share one or more physical units)\n",
4664 mdname(mddev
), mdname(mddev2
));
4667 finish_wait(&resync_wait
, &wq
);
4670 finish_wait(&resync_wait
, &wq
);
4673 } while (mddev
->curr_resync
< 2);
4675 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4676 /* resync follows the size requested by the personality,
4677 * which defaults to physical size, but can be virtual size
4679 max_sectors
= mddev
->resync_max_sectors
;
4680 mddev
->resync_mismatches
= 0;
4681 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4682 max_sectors
= mddev
->size
<< 1;
4684 /* recovery follows the physical size of devices */
4685 max_sectors
= mddev
->size
<< 1;
4687 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
4688 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
4689 " %d KB/sec/disc.\n", speed_min(mddev
));
4690 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
4691 "(but not more than %d KB/sec) for reconstruction.\n",
4694 is_mddev_idle(mddev
); /* this also initializes IO event counters */
4695 /* we don't use the checkpoint if there's a bitmap */
4696 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) && !mddev
->bitmap
4697 && ! test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4698 j
= mddev
->recovery_cp
;
4702 for (m
= 0; m
< SYNC_MARKS
; m
++) {
4704 mark_cnt
[m
] = io_sectors
;
4707 mddev
->resync_mark
= mark
[last_mark
];
4708 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
4711 * Tune reconstruction:
4713 window
= 32*(PAGE_SIZE
/512);
4714 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
4715 window
/2,(unsigned long long) max_sectors
/2);
4717 atomic_set(&mddev
->recovery_active
, 0);
4718 init_waitqueue_head(&mddev
->recovery_wait
);
4723 "md: resuming recovery of %s from checkpoint.\n",
4725 mddev
->curr_resync
= j
;
4728 while (j
< max_sectors
) {
4732 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
4733 currspeed
< speed_min(mddev
));
4735 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4739 if (!skipped
) { /* actual IO requested */
4740 io_sectors
+= sectors
;
4741 atomic_add(sectors
, &mddev
->recovery_active
);
4745 if (j
>1) mddev
->curr_resync
= j
;
4746 if (last_check
== 0)
4747 /* this is the earliers that rebuilt will be
4748 * visible in /proc/mdstat
4750 md_new_event(mddev
);
4752 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
4755 last_check
= io_sectors
;
4757 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
4758 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
4762 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
4764 int next
= (last_mark
+1) % SYNC_MARKS
;
4766 mddev
->resync_mark
= mark
[next
];
4767 mddev
->resync_mark_cnt
= mark_cnt
[next
];
4768 mark
[next
] = jiffies
;
4769 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
4774 if (kthread_should_stop()) {
4776 * got a signal, exit.
4779 "md: md_do_sync() got signal ... exiting\n");
4780 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4785 * this loop exits only if either when we are slower than
4786 * the 'hard' speed limit, or the system was IO-idle for
4788 * the system might be non-idle CPU-wise, but we only care
4789 * about not overloading the IO subsystem. (things like an
4790 * e2fsck being done on the RAID array should execute fast)
4792 mddev
->queue
->unplug_fn(mddev
->queue
);
4795 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
4796 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
4798 if (currspeed
> speed_min(mddev
)) {
4799 if ((currspeed
> speed_max(mddev
)) ||
4800 !is_mddev_idle(mddev
)) {
4806 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
4808 * this also signals 'finished resyncing' to md_stop
4811 mddev
->queue
->unplug_fn(mddev
->queue
);
4813 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
4815 /* tell personality that we are finished */
4816 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
4818 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4819 test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
4820 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
4821 mddev
->curr_resync
> 2 &&
4822 mddev
->curr_resync
>= mddev
->recovery_cp
) {
4823 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4825 "md: checkpointing recovery of %s.\n",
4827 mddev
->recovery_cp
= mddev
->curr_resync
;
4829 mddev
->recovery_cp
= MaxSector
;
4833 mddev
->curr_resync
= 0;
4834 wake_up(&resync_wait
);
4835 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4836 md_wakeup_thread(mddev
->thread
);
4838 EXPORT_SYMBOL_GPL(md_do_sync
);
4842 * This routine is regularly called by all per-raid-array threads to
4843 * deal with generic issues like resync and super-block update.
4844 * Raid personalities that don't have a thread (linear/raid0) do not
4845 * need this as they never do any recovery or update the superblock.
4847 * It does not do any resync itself, but rather "forks" off other threads
4848 * to do that as needed.
4849 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4850 * "->recovery" and create a thread at ->sync_thread.
4851 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4852 * and wakeups up this thread which will reap the thread and finish up.
4853 * This thread also removes any faulty devices (with nr_pending == 0).
4855 * The overall approach is:
4856 * 1/ if the superblock needs updating, update it.
4857 * 2/ If a recovery thread is running, don't do anything else.
4858 * 3/ If recovery has finished, clean up, possibly marking spares active.
4859 * 4/ If there are any faulty devices, remove them.
4860 * 5/ If array is degraded, try to add spares devices
4861 * 6/ If array has spares or is not in-sync, start a resync thread.
4863 void md_check_recovery(mddev_t
*mddev
)
4866 struct list_head
*rtmp
;
4870 bitmap_daemon_work(mddev
->bitmap
);
4875 if (signal_pending(current
)) {
4876 if (mddev
->pers
->sync_request
) {
4877 printk(KERN_INFO
"md: %s in immediate safe mode\n",
4879 mddev
->safemode
= 2;
4881 flush_signals(current
);
4886 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
4887 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
4888 (mddev
->safemode
== 1) ||
4889 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
4890 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
4894 if (mddev_trylock(mddev
)) {
4897 spin_lock_irq(&mddev
->write_lock
);
4898 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
4899 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
4901 mddev
->sb_dirty
= 1;
4903 if (mddev
->safemode
== 1)
4904 mddev
->safemode
= 0;
4905 spin_unlock_irq(&mddev
->write_lock
);
4907 if (mddev
->sb_dirty
)
4908 md_update_sb(mddev
);
4911 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
4912 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
4913 /* resync/recovery still happening */
4914 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4917 if (mddev
->sync_thread
) {
4918 /* resync has finished, collect result */
4919 md_unregister_thread(mddev
->sync_thread
);
4920 mddev
->sync_thread
= NULL
;
4921 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
4922 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
4924 /* activate any spares */
4925 mddev
->pers
->spare_active(mddev
);
4927 md_update_sb(mddev
);
4929 /* if array is no-longer degraded, then any saved_raid_disk
4930 * information must be scrapped
4932 if (!mddev
->degraded
)
4933 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4934 rdev
->saved_raid_disk
= -1;
4936 mddev
->recovery
= 0;
4937 /* flag recovery needed just to double check */
4938 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4939 md_new_event(mddev
);
4942 /* Clear some bits that don't mean anything, but
4945 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4946 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4947 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4948 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
4950 /* no recovery is running.
4951 * remove any failed drives, then
4952 * add spares if possible.
4953 * Spare are also removed and re-added, to allow
4954 * the personality to fail the re-add.
4956 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4957 if (rdev
->raid_disk
>= 0 &&
4958 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
4959 atomic_read(&rdev
->nr_pending
)==0) {
4960 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
4962 sprintf(nm
,"rd%d", rdev
->raid_disk
);
4963 sysfs_remove_link(&mddev
->kobj
, nm
);
4964 rdev
->raid_disk
= -1;
4968 if (mddev
->degraded
) {
4969 ITERATE_RDEV(mddev
,rdev
,rtmp
)
4970 if (rdev
->raid_disk
< 0
4971 && !test_bit(Faulty
, &rdev
->flags
)) {
4972 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
4974 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4975 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
4977 md_new_event(mddev
);
4984 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4985 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4986 } else if (mddev
->recovery_cp
< MaxSector
) {
4987 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4988 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4989 /* nothing to be done ... */
4992 if (mddev
->pers
->sync_request
) {
4993 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4994 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
4995 /* We are adding a device or devices to an array
4996 * which has the bitmap stored on all devices.
4997 * So make sure all bitmap pages get written
4999 bitmap_write_all(mddev
->bitmap
);
5001 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5004 if (!mddev
->sync_thread
) {
5005 printk(KERN_ERR
"%s: could not start resync"
5008 /* leave the spares where they are, it shouldn't hurt */
5009 mddev
->recovery
= 0;
5011 md_wakeup_thread(mddev
->sync_thread
);
5012 md_new_event(mddev
);
5015 mddev_unlock(mddev
);
5019 static int md_notify_reboot(struct notifier_block
*this,
5020 unsigned long code
, void *x
)
5022 struct list_head
*tmp
;
5025 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5027 printk(KERN_INFO
"md: stopping all md devices.\n");
5029 ITERATE_MDDEV(mddev
,tmp
)
5030 if (mddev_trylock(mddev
))
5031 do_md_stop (mddev
, 1);
5033 * certain more exotic SCSI devices are known to be
5034 * volatile wrt too early system reboots. While the
5035 * right place to handle this issue is the given
5036 * driver, we do want to have a safe RAID driver ...
5043 static struct notifier_block md_notifier
= {
5044 .notifier_call
= md_notify_reboot
,
5046 .priority
= INT_MAX
, /* before any real devices */
5049 static void md_geninit(void)
5051 struct proc_dir_entry
*p
;
5053 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5055 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
5057 p
->proc_fops
= &md_seq_fops
;
5060 static int __init
md_init(void)
5064 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5065 " MD_SB_DISKS=%d\n",
5066 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
5067 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
5068 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
5071 if (register_blkdev(MAJOR_NR
, "md"))
5073 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5074 unregister_blkdev(MAJOR_NR
, "md");
5078 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
5079 md_probe
, NULL
, NULL
);
5080 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
5081 md_probe
, NULL
, NULL
);
5083 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
5084 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
5085 S_IFBLK
|S_IRUSR
|S_IWUSR
,
5088 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
5089 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
5090 S_IFBLK
|S_IRUSR
|S_IWUSR
,
5094 register_reboot_notifier(&md_notifier
);
5095 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
5105 * Searches all registered partitions for autorun RAID arrays
5108 static dev_t detected_devices
[128];
5111 void md_autodetect_dev(dev_t dev
)
5113 if (dev_cnt
>= 0 && dev_cnt
< 127)
5114 detected_devices
[dev_cnt
++] = dev
;
5118 static void autostart_arrays(int part
)
5123 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
5125 for (i
= 0; i
< dev_cnt
; i
++) {
5126 dev_t dev
= detected_devices
[i
];
5128 rdev
= md_import_device(dev
,0, 0);
5132 if (test_bit(Faulty
, &rdev
->flags
)) {
5136 list_add(&rdev
->same_set
, &pending_raid_disks
);
5140 autorun_devices(part
);
5145 static __exit
void md_exit(void)
5148 struct list_head
*tmp
;
5150 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
5151 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
5152 for (i
=0; i
< MAX_MD_DEVS
; i
++)
5153 devfs_remove("md/%d", i
);
5154 for (i
=0; i
< MAX_MD_DEVS
; i
++)
5155 devfs_remove("md/d%d", i
);
5159 unregister_blkdev(MAJOR_NR
,"md");
5160 unregister_blkdev(mdp_major
, "mdp");
5161 unregister_reboot_notifier(&md_notifier
);
5162 unregister_sysctl_table(raid_table_header
);
5163 remove_proc_entry("mdstat", NULL
);
5164 ITERATE_MDDEV(mddev
,tmp
) {
5165 struct gendisk
*disk
= mddev
->gendisk
;
5168 export_array(mddev
);
5171 mddev
->gendisk
= NULL
;
5176 module_init(md_init
)
5177 module_exit(md_exit
)
5179 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5181 return sprintf(buffer
, "%d", start_readonly
);
5183 static int set_ro(const char *val
, struct kernel_param
*kp
)
5186 int num
= simple_strtoul(val
, &e
, 10);
5187 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5188 start_readonly
= num
;
5194 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, 0600);
5195 module_param(start_dirty_degraded
, int, 0644);
5198 EXPORT_SYMBOL(register_md_personality
);
5199 EXPORT_SYMBOL(unregister_md_personality
);
5200 EXPORT_SYMBOL(md_error
);
5201 EXPORT_SYMBOL(md_done_sync
);
5202 EXPORT_SYMBOL(md_write_start
);
5203 EXPORT_SYMBOL(md_write_end
);
5204 EXPORT_SYMBOL(md_register_thread
);
5205 EXPORT_SYMBOL(md_unregister_thread
);
5206 EXPORT_SYMBOL(md_wakeup_thread
);
5207 EXPORT_SYMBOL(md_print_devices
);
5208 EXPORT_SYMBOL(md_check_recovery
);
5209 MODULE_LICENSE("GPL");
5211 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);