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>
47 #include <linux/ctype.h>
49 #include <linux/init.h>
51 #include <linux/file.h>
54 #include <linux/kmod.h>
57 #include <asm/unaligned.h>
59 #define MAJOR_NR MD_MAJOR
62 /* 63 partitions with the alternate major number (mdp) */
63 #define MdpMinorShift 6
66 #define dprintk(x...) ((void)(DEBUG && printk(x)))
70 static void autostart_arrays (int part
);
73 static LIST_HEAD(pers_list
);
74 static DEFINE_SPINLOCK(pers_lock
);
76 static void md_print_devices(void);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
82 * is 1000 KB/sec, so the extra system load does not show up that much.
83 * Increase it if you want to have more _guaranteed_ speed. Note that
84 * the RAID driver will use the maximum available bandwidth if the IO
85 * subsystem is idle. There is also an 'absolute maximum' reconstruction
86 * speed limit - in case reconstruction slows down your system despite
89 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
90 * or /sys/block/mdX/md/sync_speed_{min,max}
93 static int sysctl_speed_limit_min
= 1000;
94 static int sysctl_speed_limit_max
= 200000;
95 static inline int speed_min(mddev_t
*mddev
)
97 return mddev
->sync_speed_min
?
98 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
101 static inline int speed_max(mddev_t
*mddev
)
103 return mddev
->sync_speed_max
?
104 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
107 static struct ctl_table_header
*raid_table_header
;
109 static ctl_table raid_table
[] = {
111 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
112 .procname
= "speed_limit_min",
113 .data
= &sysctl_speed_limit_min
,
114 .maxlen
= sizeof(int),
116 .proc_handler
= &proc_dointvec
,
119 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
120 .procname
= "speed_limit_max",
121 .data
= &sysctl_speed_limit_max
,
122 .maxlen
= sizeof(int),
124 .proc_handler
= &proc_dointvec
,
129 static ctl_table raid_dir_table
[] = {
131 .ctl_name
= DEV_RAID
,
140 static ctl_table raid_root_table
[] = {
146 .child
= raid_dir_table
,
151 static struct block_device_operations md_fops
;
153 static int start_readonly
;
156 * We have a system wide 'event count' that is incremented
157 * on any 'interesting' event, and readers of /proc/mdstat
158 * can use 'poll' or 'select' to find out when the event
162 * start array, stop array, error, add device, remove device,
163 * start build, activate spare
165 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
166 static atomic_t md_event_count
;
167 void md_new_event(mddev_t
*mddev
)
169 atomic_inc(&md_event_count
);
170 wake_up(&md_event_waiters
);
171 sysfs_notify(&mddev
->kobj
, NULL
, "sync_action");
173 EXPORT_SYMBOL_GPL(md_new_event
);
175 /* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
178 void md_new_event_inintr(mddev_t
*mddev
)
180 atomic_inc(&md_event_count
);
181 wake_up(&md_event_waiters
);
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
188 static LIST_HEAD(all_mddevs
);
189 static DEFINE_SPINLOCK(all_mddevs_lock
);
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
199 #define ITERATE_MDDEV(mddev,tmp) \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
215 static int md_fail_request (request_queue_t
*q
, struct bio
*bio
)
217 bio_io_error(bio
, bio
->bi_size
);
221 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
223 atomic_inc(&mddev
->active
);
227 static void mddev_put(mddev_t
*mddev
)
229 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
231 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
)) {
232 list_del(&mddev
->all_mddevs
);
233 spin_unlock(&all_mddevs_lock
);
234 blk_cleanup_queue(mddev
->queue
);
235 kobject_unregister(&mddev
->kobj
);
237 spin_unlock(&all_mddevs_lock
);
240 static mddev_t
* mddev_find(dev_t unit
)
242 mddev_t
*mddev
, *new = NULL
;
245 spin_lock(&all_mddevs_lock
);
246 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
247 if (mddev
->unit
== unit
) {
249 spin_unlock(&all_mddevs_lock
);
255 list_add(&new->all_mddevs
, &all_mddevs
);
256 spin_unlock(&all_mddevs_lock
);
259 spin_unlock(&all_mddevs_lock
);
261 new = kzalloc(sizeof(*new), GFP_KERNEL
);
266 if (MAJOR(unit
) == MD_MAJOR
)
267 new->md_minor
= MINOR(unit
);
269 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
271 mutex_init(&new->reconfig_mutex
);
272 INIT_LIST_HEAD(&new->disks
);
273 INIT_LIST_HEAD(&new->all_mddevs
);
274 init_timer(&new->safemode_timer
);
275 atomic_set(&new->active
, 1);
276 spin_lock_init(&new->write_lock
);
277 init_waitqueue_head(&new->sb_wait
);
279 new->queue
= blk_alloc_queue(GFP_KERNEL
);
284 set_bit(QUEUE_FLAG_CLUSTER
, &new->queue
->queue_flags
);
286 blk_queue_make_request(new->queue
, md_fail_request
);
291 static inline int mddev_lock(mddev_t
* mddev
)
293 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
296 static inline int mddev_trylock(mddev_t
* mddev
)
298 return mutex_trylock(&mddev
->reconfig_mutex
);
301 static inline void mddev_unlock(mddev_t
* mddev
)
303 mutex_unlock(&mddev
->reconfig_mutex
);
305 md_wakeup_thread(mddev
->thread
);
308 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
311 struct list_head
*tmp
;
313 ITERATE_RDEV(mddev
,rdev
,tmp
) {
314 if (rdev
->desc_nr
== nr
)
320 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
322 struct list_head
*tmp
;
325 ITERATE_RDEV(mddev
,rdev
,tmp
) {
326 if (rdev
->bdev
->bd_dev
== dev
)
332 static struct mdk_personality
*find_pers(int level
, char *clevel
)
334 struct mdk_personality
*pers
;
335 list_for_each_entry(pers
, &pers_list
, list
) {
336 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
338 if (strcmp(pers
->name
, clevel
)==0)
344 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
346 sector_t size
= bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
347 return MD_NEW_SIZE_BLOCKS(size
);
350 static sector_t
calc_dev_size(mdk_rdev_t
*rdev
, unsigned chunk_size
)
354 size
= rdev
->sb_offset
;
357 size
&= ~((sector_t
)chunk_size
/1024 - 1);
361 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
366 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
367 if (!rdev
->sb_page
) {
368 printk(KERN_ALERT
"md: out of memory.\n");
375 static void free_disk_sb(mdk_rdev_t
* rdev
)
378 put_page(rdev
->sb_page
);
380 rdev
->sb_page
= NULL
;
387 static int super_written(struct bio
*bio
, unsigned int bytes_done
, int error
)
389 mdk_rdev_t
*rdev
= bio
->bi_private
;
390 mddev_t
*mddev
= rdev
->mddev
;
394 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
))
395 md_error(mddev
, rdev
);
397 if (atomic_dec_and_test(&mddev
->pending_writes
))
398 wake_up(&mddev
->sb_wait
);
403 static int super_written_barrier(struct bio
*bio
, unsigned int bytes_done
, int error
)
405 struct bio
*bio2
= bio
->bi_private
;
406 mdk_rdev_t
*rdev
= bio2
->bi_private
;
407 mddev_t
*mddev
= rdev
->mddev
;
411 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
412 error
== -EOPNOTSUPP
) {
414 /* barriers don't appear to be supported :-( */
415 set_bit(BarriersNotsupp
, &rdev
->flags
);
416 mddev
->barriers_work
= 0;
417 spin_lock_irqsave(&mddev
->write_lock
, flags
);
418 bio2
->bi_next
= mddev
->biolist
;
419 mddev
->biolist
= bio2
;
420 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
421 wake_up(&mddev
->sb_wait
);
426 bio
->bi_private
= rdev
;
427 return super_written(bio
, bytes_done
, error
);
430 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
431 sector_t sector
, int size
, struct page
*page
)
433 /* write first size bytes of page to sector of rdev
434 * Increment mddev->pending_writes before returning
435 * and decrement it on completion, waking up sb_wait
436 * if zero is reached.
437 * If an error occurred, call md_error
439 * As we might need to resubmit the request if BIO_RW_BARRIER
440 * causes ENOTSUPP, we allocate a spare bio...
442 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
443 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNC
);
445 bio
->bi_bdev
= rdev
->bdev
;
446 bio
->bi_sector
= sector
;
447 bio_add_page(bio
, page
, size
, 0);
448 bio
->bi_private
= rdev
;
449 bio
->bi_end_io
= super_written
;
452 atomic_inc(&mddev
->pending_writes
);
453 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
455 rw
|= (1<<BIO_RW_BARRIER
);
456 rbio
= bio_clone(bio
, GFP_NOIO
);
457 rbio
->bi_private
= bio
;
458 rbio
->bi_end_io
= super_written_barrier
;
459 submit_bio(rw
, rbio
);
464 void md_super_wait(mddev_t
*mddev
)
466 /* wait for all superblock writes that were scheduled to complete.
467 * if any had to be retried (due to BARRIER problems), retry them
471 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
472 if (atomic_read(&mddev
->pending_writes
)==0)
474 while (mddev
->biolist
) {
476 spin_lock_irq(&mddev
->write_lock
);
477 bio
= mddev
->biolist
;
478 mddev
->biolist
= bio
->bi_next
;
480 spin_unlock_irq(&mddev
->write_lock
);
481 submit_bio(bio
->bi_rw
, bio
);
485 finish_wait(&mddev
->sb_wait
, &wq
);
488 static int bi_complete(struct bio
*bio
, unsigned int bytes_done
, int error
)
493 complete((struct completion
*)bio
->bi_private
);
497 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
498 struct page
*page
, int rw
)
500 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
501 struct completion event
;
504 rw
|= (1 << BIO_RW_SYNC
);
507 bio
->bi_sector
= sector
;
508 bio_add_page(bio
, page
, size
, 0);
509 init_completion(&event
);
510 bio
->bi_private
= &event
;
511 bio
->bi_end_io
= bi_complete
;
513 wait_for_completion(&event
);
515 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
519 EXPORT_SYMBOL_GPL(sync_page_io
);
521 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
523 char b
[BDEVNAME_SIZE
];
524 if (!rdev
->sb_page
) {
532 if (!sync_page_io(rdev
->bdev
, rdev
->sb_offset
<<1, size
, rdev
->sb_page
, READ
))
538 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev
->bdev
,b
));
543 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
545 if ( (sb1
->set_uuid0
== sb2
->set_uuid0
) &&
546 (sb1
->set_uuid1
== sb2
->set_uuid1
) &&
547 (sb1
->set_uuid2
== sb2
->set_uuid2
) &&
548 (sb1
->set_uuid3
== sb2
->set_uuid3
))
556 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
559 mdp_super_t
*tmp1
, *tmp2
;
561 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
562 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
564 if (!tmp1
|| !tmp2
) {
566 printk(KERN_INFO
"md.c: sb1 is not equal to sb2!\n");
574 * nr_disks is not constant
579 if (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4))
590 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
592 unsigned int disk_csum
, csum
;
594 disk_csum
= sb
->sb_csum
;
596 csum
= csum_partial((void *)sb
, MD_SB_BYTES
, 0);
597 sb
->sb_csum
= disk_csum
;
603 * Handle superblock details.
604 * We want to be able to handle multiple superblock formats
605 * so we have a common interface to them all, and an array of
606 * different handlers.
607 * We rely on user-space to write the initial superblock, and support
608 * reading and updating of superblocks.
609 * Interface methods are:
610 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
611 * loads and validates a superblock on dev.
612 * if refdev != NULL, compare superblocks on both devices
614 * 0 - dev has a superblock that is compatible with refdev
615 * 1 - dev has a superblock that is compatible and newer than refdev
616 * so dev should be used as the refdev in future
617 * -EINVAL superblock incompatible or invalid
618 * -othererror e.g. -EIO
620 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
621 * Verify that dev is acceptable into mddev.
622 * The first time, mddev->raid_disks will be 0, and data from
623 * dev should be merged in. Subsequent calls check that dev
624 * is new enough. Return 0 or -EINVAL
626 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
627 * Update the superblock for rdev with data in mddev
628 * This does not write to disc.
634 struct module
*owner
;
635 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
);
636 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
637 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
641 * load_super for 0.90.0
643 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
645 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
651 * Calculate the position of the superblock,
652 * it's at the end of the disk.
654 * It also happens to be a multiple of 4Kb.
656 sb_offset
= calc_dev_sboffset(rdev
->bdev
);
657 rdev
->sb_offset
= sb_offset
;
659 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
664 bdevname(rdev
->bdev
, b
);
665 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
667 if (sb
->md_magic
!= MD_SB_MAGIC
) {
668 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
673 if (sb
->major_version
!= 0 ||
674 sb
->minor_version
< 90 ||
675 sb
->minor_version
> 91) {
676 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
677 sb
->major_version
, sb
->minor_version
,
682 if (sb
->raid_disks
<= 0)
685 if (csum_fold(calc_sb_csum(sb
)) != csum_fold(sb
->sb_csum
)) {
686 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
691 rdev
->preferred_minor
= sb
->md_minor
;
692 rdev
->data_offset
= 0;
693 rdev
->sb_size
= MD_SB_BYTES
;
695 if (sb
->level
== LEVEL_MULTIPATH
)
698 rdev
->desc_nr
= sb
->this_disk
.number
;
704 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
705 if (!uuid_equal(refsb
, sb
)) {
706 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
707 b
, bdevname(refdev
->bdev
,b2
));
710 if (!sb_equal(refsb
, sb
)) {
711 printk(KERN_WARNING
"md: %s has same UUID"
712 " but different superblock to %s\n",
713 b
, bdevname(refdev
->bdev
, b2
));
717 ev2
= md_event(refsb
);
723 rdev
->size
= calc_dev_size(rdev
, sb
->chunk_size
);
725 if (rdev
->size
< sb
->size
&& sb
->level
> 1)
726 /* "this cannot possibly happen" ... */
734 * validate_super for 0.90.0
736 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
739 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
740 __u64 ev1
= md_event(sb
);
742 rdev
->raid_disk
= -1;
744 if (mddev
->raid_disks
== 0) {
745 mddev
->major_version
= 0;
746 mddev
->minor_version
= sb
->minor_version
;
747 mddev
->patch_version
= sb
->patch_version
;
748 mddev
->persistent
= ! sb
->not_persistent
;
749 mddev
->chunk_size
= sb
->chunk_size
;
750 mddev
->ctime
= sb
->ctime
;
751 mddev
->utime
= sb
->utime
;
752 mddev
->level
= sb
->level
;
753 mddev
->clevel
[0] = 0;
754 mddev
->layout
= sb
->layout
;
755 mddev
->raid_disks
= sb
->raid_disks
;
756 mddev
->size
= sb
->size
;
758 mddev
->bitmap_offset
= 0;
759 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
761 if (mddev
->minor_version
>= 91) {
762 mddev
->reshape_position
= sb
->reshape_position
;
763 mddev
->delta_disks
= sb
->delta_disks
;
764 mddev
->new_level
= sb
->new_level
;
765 mddev
->new_layout
= sb
->new_layout
;
766 mddev
->new_chunk
= sb
->new_chunk
;
768 mddev
->reshape_position
= MaxSector
;
769 mddev
->delta_disks
= 0;
770 mddev
->new_level
= mddev
->level
;
771 mddev
->new_layout
= mddev
->layout
;
772 mddev
->new_chunk
= mddev
->chunk_size
;
775 if (sb
->state
& (1<<MD_SB_CLEAN
))
776 mddev
->recovery_cp
= MaxSector
;
778 if (sb
->events_hi
== sb
->cp_events_hi
&&
779 sb
->events_lo
== sb
->cp_events_lo
) {
780 mddev
->recovery_cp
= sb
->recovery_cp
;
782 mddev
->recovery_cp
= 0;
785 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
786 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
787 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
788 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
790 mddev
->max_disks
= MD_SB_DISKS
;
792 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
793 mddev
->bitmap_file
== NULL
) {
794 if (mddev
->level
!= 1 && mddev
->level
!= 4
795 && mddev
->level
!= 5 && mddev
->level
!= 6
796 && mddev
->level
!= 10) {
797 /* FIXME use a better test */
798 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
801 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
804 } else if (mddev
->pers
== NULL
) {
805 /* Insist on good event counter while assembling */
807 if (ev1
< mddev
->events
)
809 } else if (mddev
->bitmap
) {
810 /* if adding to array with a bitmap, then we can accept an
811 * older device ... but not too old.
813 if (ev1
< mddev
->bitmap
->events_cleared
)
816 if (ev1
< mddev
->events
)
817 /* just a hot-add of a new device, leave raid_disk at -1 */
821 if (mddev
->level
!= LEVEL_MULTIPATH
) {
822 desc
= sb
->disks
+ rdev
->desc_nr
;
824 if (desc
->state
& (1<<MD_DISK_FAULTY
))
825 set_bit(Faulty
, &rdev
->flags
);
826 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
827 desc->raid_disk < mddev->raid_disks */) {
828 set_bit(In_sync
, &rdev
->flags
);
829 rdev
->raid_disk
= desc
->raid_disk
;
831 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
832 set_bit(WriteMostly
, &rdev
->flags
);
833 } else /* MULTIPATH are always insync */
834 set_bit(In_sync
, &rdev
->flags
);
839 * sync_super for 0.90.0
841 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
844 struct list_head
*tmp
;
846 int next_spare
= mddev
->raid_disks
;
849 /* make rdev->sb match mddev data..
852 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
853 * 3/ any empty disks < next_spare become removed
855 * disks[0] gets initialised to REMOVED because
856 * we cannot be sure from other fields if it has
857 * been initialised or not.
860 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
862 rdev
->sb_size
= MD_SB_BYTES
;
864 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
866 memset(sb
, 0, sizeof(*sb
));
868 sb
->md_magic
= MD_SB_MAGIC
;
869 sb
->major_version
= mddev
->major_version
;
870 sb
->patch_version
= mddev
->patch_version
;
871 sb
->gvalid_words
= 0; /* ignored */
872 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
873 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
874 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
875 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
877 sb
->ctime
= mddev
->ctime
;
878 sb
->level
= mddev
->level
;
879 sb
->size
= mddev
->size
;
880 sb
->raid_disks
= mddev
->raid_disks
;
881 sb
->md_minor
= mddev
->md_minor
;
882 sb
->not_persistent
= !mddev
->persistent
;
883 sb
->utime
= mddev
->utime
;
885 sb
->events_hi
= (mddev
->events
>>32);
886 sb
->events_lo
= (u32
)mddev
->events
;
888 if (mddev
->reshape_position
== MaxSector
)
889 sb
->minor_version
= 90;
891 sb
->minor_version
= 91;
892 sb
->reshape_position
= mddev
->reshape_position
;
893 sb
->new_level
= mddev
->new_level
;
894 sb
->delta_disks
= mddev
->delta_disks
;
895 sb
->new_layout
= mddev
->new_layout
;
896 sb
->new_chunk
= mddev
->new_chunk
;
898 mddev
->minor_version
= sb
->minor_version
;
901 sb
->recovery_cp
= mddev
->recovery_cp
;
902 sb
->cp_events_hi
= (mddev
->events
>>32);
903 sb
->cp_events_lo
= (u32
)mddev
->events
;
904 if (mddev
->recovery_cp
== MaxSector
)
905 sb
->state
= (1<< MD_SB_CLEAN
);
909 sb
->layout
= mddev
->layout
;
910 sb
->chunk_size
= mddev
->chunk_size
;
912 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
913 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
915 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
916 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
919 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
920 && !test_bit(Faulty
, &rdev2
->flags
))
921 desc_nr
= rdev2
->raid_disk
;
923 desc_nr
= next_spare
++;
924 rdev2
->desc_nr
= desc_nr
;
925 d
= &sb
->disks
[rdev2
->desc_nr
];
927 d
->number
= rdev2
->desc_nr
;
928 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
929 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
930 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
931 && !test_bit(Faulty
, &rdev2
->flags
))
932 d
->raid_disk
= rdev2
->raid_disk
;
934 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
935 if (test_bit(Faulty
, &rdev2
->flags
))
936 d
->state
= (1<<MD_DISK_FAULTY
);
937 else if (test_bit(In_sync
, &rdev2
->flags
)) {
938 d
->state
= (1<<MD_DISK_ACTIVE
);
939 d
->state
|= (1<<MD_DISK_SYNC
);
947 if (test_bit(WriteMostly
, &rdev2
->flags
))
948 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
950 /* now set the "removed" and "faulty" bits on any missing devices */
951 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
952 mdp_disk_t
*d
= &sb
->disks
[i
];
953 if (d
->state
== 0 && d
->number
== 0) {
956 d
->state
= (1<<MD_DISK_REMOVED
);
957 d
->state
|= (1<<MD_DISK_FAULTY
);
961 sb
->nr_disks
= nr_disks
;
962 sb
->active_disks
= active
;
963 sb
->working_disks
= working
;
964 sb
->failed_disks
= failed
;
965 sb
->spare_disks
= spare
;
967 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
968 sb
->sb_csum
= calc_sb_csum(sb
);
972 * version 1 superblock
975 static unsigned int calc_sb_1_csum(struct mdp_superblock_1
* sb
)
977 unsigned int disk_csum
, csum
;
978 unsigned long long newcsum
;
979 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
980 unsigned int *isuper
= (unsigned int*)sb
;
983 disk_csum
= sb
->sb_csum
;
986 for (i
=0; size
>=4; size
-= 4 )
987 newcsum
+= le32_to_cpu(*isuper
++);
990 newcsum
+= le16_to_cpu(*(unsigned short*) isuper
);
992 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
993 sb
->sb_csum
= disk_csum
;
994 return cpu_to_le32(csum
);
997 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
999 struct mdp_superblock_1
*sb
;
1002 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1006 * Calculate the position of the superblock.
1007 * It is always aligned to a 4K boundary and
1008 * depeding on minor_version, it can be:
1009 * 0: At least 8K, but less than 12K, from end of device
1010 * 1: At start of device
1011 * 2: 4K from start of device.
1013 switch(minor_version
) {
1015 sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1017 sb_offset
&= ~(sector_t
)(4*2-1);
1018 /* convert from sectors to K */
1030 rdev
->sb_offset
= sb_offset
;
1032 /* superblock is rarely larger than 1K, but it can be larger,
1033 * and it is safe to read 4k, so we do that
1035 ret
= read_disk_sb(rdev
, 4096);
1036 if (ret
) return ret
;
1039 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1041 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1042 sb
->major_version
!= cpu_to_le32(1) ||
1043 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1044 le64_to_cpu(sb
->super_offset
) != (rdev
->sb_offset
<<1) ||
1045 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1048 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1049 printk("md: invalid superblock checksum on %s\n",
1050 bdevname(rdev
->bdev
,b
));
1053 if (le64_to_cpu(sb
->data_size
) < 10) {
1054 printk("md: data_size too small on %s\n",
1055 bdevname(rdev
->bdev
,b
));
1058 rdev
->preferred_minor
= 0xffff;
1059 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1060 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1062 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1063 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1064 if (rdev
->sb_size
& bmask
)
1065 rdev
-> sb_size
= (rdev
->sb_size
| bmask
)+1;
1071 struct mdp_superblock_1
*refsb
=
1072 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1074 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1075 sb
->level
!= refsb
->level
||
1076 sb
->layout
!= refsb
->layout
||
1077 sb
->chunksize
!= refsb
->chunksize
) {
1078 printk(KERN_WARNING
"md: %s has strangely different"
1079 " superblock to %s\n",
1080 bdevname(rdev
->bdev
,b
),
1081 bdevname(refdev
->bdev
,b2
));
1084 ev1
= le64_to_cpu(sb
->events
);
1085 ev2
= le64_to_cpu(refsb
->events
);
1093 rdev
->size
= ((rdev
->bdev
->bd_inode
->i_size
>>9) - le64_to_cpu(sb
->data_offset
)) / 2;
1095 rdev
->size
= rdev
->sb_offset
;
1096 if (rdev
->size
< le64_to_cpu(sb
->data_size
)/2)
1098 rdev
->size
= le64_to_cpu(sb
->data_size
)/2;
1099 if (le32_to_cpu(sb
->chunksize
))
1100 rdev
->size
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
)/2 - 1);
1102 if (le32_to_cpu(sb
->size
) > rdev
->size
*2)
1107 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1109 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1110 __u64 ev1
= le64_to_cpu(sb
->events
);
1112 rdev
->raid_disk
= -1;
1114 if (mddev
->raid_disks
== 0) {
1115 mddev
->major_version
= 1;
1116 mddev
->patch_version
= 0;
1117 mddev
->persistent
= 1;
1118 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1119 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1120 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1121 mddev
->level
= le32_to_cpu(sb
->level
);
1122 mddev
->clevel
[0] = 0;
1123 mddev
->layout
= le32_to_cpu(sb
->layout
);
1124 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1125 mddev
->size
= le64_to_cpu(sb
->size
)/2;
1126 mddev
->events
= ev1
;
1127 mddev
->bitmap_offset
= 0;
1128 mddev
->default_bitmap_offset
= 1024 >> 9;
1130 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1131 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1133 mddev
->max_disks
= (4096-256)/2;
1135 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1136 mddev
->bitmap_file
== NULL
) {
1137 if (mddev
->level
!= 1 && mddev
->level
!= 5 && mddev
->level
!= 6
1138 && mddev
->level
!= 10) {
1139 printk(KERN_WARNING
"md: bitmaps not supported for this level.\n");
1142 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1144 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1145 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1146 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1147 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1148 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1149 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1151 mddev
->reshape_position
= MaxSector
;
1152 mddev
->delta_disks
= 0;
1153 mddev
->new_level
= mddev
->level
;
1154 mddev
->new_layout
= mddev
->layout
;
1155 mddev
->new_chunk
= mddev
->chunk_size
;
1158 } else if (mddev
->pers
== NULL
) {
1159 /* Insist of good event counter while assembling */
1161 if (ev1
< mddev
->events
)
1163 } else if (mddev
->bitmap
) {
1164 /* If adding to array with a bitmap, then we can accept an
1165 * older device, but not too old.
1167 if (ev1
< mddev
->bitmap
->events_cleared
)
1170 if (ev1
< mddev
->events
)
1171 /* just a hot-add of a new device, leave raid_disk at -1 */
1174 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1176 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1177 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1179 case 0xffff: /* spare */
1181 case 0xfffe: /* faulty */
1182 set_bit(Faulty
, &rdev
->flags
);
1185 if ((le32_to_cpu(sb
->feature_map
) &
1186 MD_FEATURE_RECOVERY_OFFSET
))
1187 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1189 set_bit(In_sync
, &rdev
->flags
);
1190 rdev
->raid_disk
= role
;
1193 if (sb
->devflags
& WriteMostly1
)
1194 set_bit(WriteMostly
, &rdev
->flags
);
1195 } else /* MULTIPATH are always insync */
1196 set_bit(In_sync
, &rdev
->flags
);
1201 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1203 struct mdp_superblock_1
*sb
;
1204 struct list_head
*tmp
;
1207 /* make rdev->sb match mddev and rdev data. */
1209 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1211 sb
->feature_map
= 0;
1213 sb
->recovery_offset
= cpu_to_le64(0);
1214 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1215 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1216 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1218 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1219 sb
->events
= cpu_to_le64(mddev
->events
);
1221 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1223 sb
->resync_offset
= cpu_to_le64(0);
1225 sb
->cnt_corrected_read
= atomic_read(&rdev
->corrected_errors
);
1227 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1228 sb
->size
= cpu_to_le64(mddev
->size
<<1);
1230 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1231 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1232 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1235 if (rdev
->raid_disk
>= 0 &&
1236 !test_bit(In_sync
, &rdev
->flags
) &&
1237 rdev
->recovery_offset
> 0) {
1238 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1239 sb
->recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1242 if (mddev
->reshape_position
!= MaxSector
) {
1243 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1244 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1245 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1246 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1247 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1248 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1252 ITERATE_RDEV(mddev
,rdev2
,tmp
)
1253 if (rdev2
->desc_nr
+1 > max_dev
)
1254 max_dev
= rdev2
->desc_nr
+1;
1256 sb
->max_dev
= cpu_to_le32(max_dev
);
1257 for (i
=0; i
<max_dev
;i
++)
1258 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1260 ITERATE_RDEV(mddev
,rdev2
,tmp
) {
1262 if (test_bit(Faulty
, &rdev2
->flags
))
1263 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1264 else if (test_bit(In_sync
, &rdev2
->flags
))
1265 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1266 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1267 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1269 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1272 sb
->sb_csum
= calc_sb_1_csum(sb
);
1276 static struct super_type super_types
[] = {
1279 .owner
= THIS_MODULE
,
1280 .load_super
= super_90_load
,
1281 .validate_super
= super_90_validate
,
1282 .sync_super
= super_90_sync
,
1286 .owner
= THIS_MODULE
,
1287 .load_super
= super_1_load
,
1288 .validate_super
= super_1_validate
,
1289 .sync_super
= super_1_sync
,
1293 static mdk_rdev_t
* match_dev_unit(mddev_t
*mddev
, mdk_rdev_t
*dev
)
1295 struct list_head
*tmp
;
1298 ITERATE_RDEV(mddev
,rdev
,tmp
)
1299 if (rdev
->bdev
->bd_contains
== dev
->bdev
->bd_contains
)
1305 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1307 struct list_head
*tmp
;
1310 ITERATE_RDEV(mddev1
,rdev
,tmp
)
1311 if (match_dev_unit(mddev2
, rdev
))
1317 static LIST_HEAD(pending_raid_disks
);
1319 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1321 mdk_rdev_t
*same_pdev
;
1322 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1330 /* make sure rdev->size exceeds mddev->size */
1331 if (rdev
->size
&& (mddev
->size
== 0 || rdev
->size
< mddev
->size
)) {
1333 /* Cannot change size, so fail */
1336 mddev
->size
= rdev
->size
;
1338 same_pdev
= match_dev_unit(mddev
, rdev
);
1341 "%s: WARNING: %s appears to be on the same physical"
1342 " disk as %s. True\n protection against single-disk"
1343 " failure might be compromised.\n",
1344 mdname(mddev
), bdevname(rdev
->bdev
,b
),
1345 bdevname(same_pdev
->bdev
,b2
));
1347 /* Verify rdev->desc_nr is unique.
1348 * If it is -1, assign a free number, else
1349 * check number is not in use
1351 if (rdev
->desc_nr
< 0) {
1353 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1354 while (find_rdev_nr(mddev
, choice
))
1356 rdev
->desc_nr
= choice
;
1358 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1361 bdevname(rdev
->bdev
,b
);
1362 if (kobject_set_name(&rdev
->kobj
, "dev-%s", b
) < 0)
1364 while ( (s
=strchr(rdev
->kobj
.k_name
, '/')) != NULL
)
1367 list_add(&rdev
->same_set
, &mddev
->disks
);
1368 rdev
->mddev
= mddev
;
1369 printk(KERN_INFO
"md: bind<%s>\n", b
);
1371 rdev
->kobj
.parent
= &mddev
->kobj
;
1372 kobject_add(&rdev
->kobj
);
1374 if (rdev
->bdev
->bd_part
)
1375 ko
= &rdev
->bdev
->bd_part
->kobj
;
1377 ko
= &rdev
->bdev
->bd_disk
->kobj
;
1378 sysfs_create_link(&rdev
->kobj
, ko
, "block");
1379 bd_claim_by_disk(rdev
->bdev
, rdev
, mddev
->gendisk
);
1383 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1385 char b
[BDEVNAME_SIZE
];
1390 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1391 list_del_init(&rdev
->same_set
);
1392 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1394 sysfs_remove_link(&rdev
->kobj
, "block");
1395 kobject_del(&rdev
->kobj
);
1399 * prevent the device from being mounted, repartitioned or
1400 * otherwise reused by a RAID array (or any other kernel
1401 * subsystem), by bd_claiming the device.
1403 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
)
1406 struct block_device
*bdev
;
1407 char b
[BDEVNAME_SIZE
];
1409 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1411 printk(KERN_ERR
"md: could not open %s.\n",
1412 __bdevname(dev
, b
));
1413 return PTR_ERR(bdev
);
1415 err
= bd_claim(bdev
, rdev
);
1417 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1426 static void unlock_rdev(mdk_rdev_t
*rdev
)
1428 struct block_device
*bdev
= rdev
->bdev
;
1436 void md_autodetect_dev(dev_t dev
);
1438 static void export_rdev(mdk_rdev_t
* rdev
)
1440 char b
[BDEVNAME_SIZE
];
1441 printk(KERN_INFO
"md: export_rdev(%s)\n",
1442 bdevname(rdev
->bdev
,b
));
1446 list_del_init(&rdev
->same_set
);
1448 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1451 kobject_put(&rdev
->kobj
);
1454 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1456 unbind_rdev_from_array(rdev
);
1460 static void export_array(mddev_t
*mddev
)
1462 struct list_head
*tmp
;
1465 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1470 kick_rdev_from_array(rdev
);
1472 if (!list_empty(&mddev
->disks
))
1474 mddev
->raid_disks
= 0;
1475 mddev
->major_version
= 0;
1478 static void print_desc(mdp_disk_t
*desc
)
1480 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1481 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1484 static void print_sb(mdp_super_t
*sb
)
1489 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1490 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1491 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1493 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1494 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1495 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1496 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1497 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1498 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1499 sb
->failed_disks
, sb
->spare_disks
,
1500 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1503 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1506 desc
= sb
->disks
+ i
;
1507 if (desc
->number
|| desc
->major
|| desc
->minor
||
1508 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1509 printk(" D %2d: ", i
);
1513 printk(KERN_INFO
"md: THIS: ");
1514 print_desc(&sb
->this_disk
);
1518 static void print_rdev(mdk_rdev_t
*rdev
)
1520 char b
[BDEVNAME_SIZE
];
1521 printk(KERN_INFO
"md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1522 bdevname(rdev
->bdev
,b
), (unsigned long long)rdev
->size
,
1523 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1525 if (rdev
->sb_loaded
) {
1526 printk(KERN_INFO
"md: rdev superblock:\n");
1527 print_sb((mdp_super_t
*)page_address(rdev
->sb_page
));
1529 printk(KERN_INFO
"md: no rdev superblock!\n");
1532 static void md_print_devices(void)
1534 struct list_head
*tmp
, *tmp2
;
1537 char b
[BDEVNAME_SIZE
];
1540 printk("md: **********************************\n");
1541 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1542 printk("md: **********************************\n");
1543 ITERATE_MDDEV(mddev
,tmp
) {
1546 bitmap_print_sb(mddev
->bitmap
);
1548 printk("%s: ", mdname(mddev
));
1549 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1550 printk("<%s>", bdevname(rdev
->bdev
,b
));
1553 ITERATE_RDEV(mddev
,rdev
,tmp2
)
1556 printk("md: **********************************\n");
1561 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1563 /* Update each superblock (in-memory image), but
1564 * if we are allowed to, skip spares which already
1565 * have the right event counter, or have one earlier
1566 * (which would mean they aren't being marked as dirty
1567 * with the rest of the array)
1570 struct list_head
*tmp
;
1572 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1573 if (rdev
->sb_events
== mddev
->events
||
1575 rdev
->raid_disk
< 0 &&
1576 (rdev
->sb_events
&1)==0 &&
1577 rdev
->sb_events
+1 == mddev
->events
)) {
1578 /* Don't update this superblock */
1579 rdev
->sb_loaded
= 2;
1581 super_types
[mddev
->major_version
].
1582 sync_super(mddev
, rdev
);
1583 rdev
->sb_loaded
= 1;
1588 void md_update_sb(mddev_t
* mddev
)
1591 struct list_head
*tmp
;
1597 spin_lock_irq(&mddev
->write_lock
);
1598 sync_req
= mddev
->in_sync
;
1599 mddev
->utime
= get_seconds();
1600 if (mddev
->sb_dirty
== 3)
1601 /* just a clean<-> dirty transition, possibly leave spares alone,
1602 * though if events isn't the right even/odd, we will have to do
1607 /* If this is just a dirty<->clean transition, and the array is clean
1608 * and 'events' is odd, we can roll back to the previous clean state */
1609 if (mddev
->sb_dirty
== 3
1610 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1611 && (mddev
->events
& 1))
1614 /* otherwise we have to go forward and ... */
1616 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1617 /* .. if the array isn't clean, insist on an odd 'events' */
1618 if ((mddev
->events
&1)==0) {
1623 /* otherwise insist on an even 'events' (for clean states) */
1624 if ((mddev
->events
&1)) {
1631 if (!mddev
->events
) {
1633 * oops, this 64-bit counter should never wrap.
1634 * Either we are in around ~1 trillion A.C., assuming
1635 * 1 reboot per second, or we have a bug:
1640 mddev
->sb_dirty
= 2;
1641 sync_sbs(mddev
, nospares
);
1644 * do not write anything to disk if using
1645 * nonpersistent superblocks
1647 if (!mddev
->persistent
) {
1648 mddev
->sb_dirty
= 0;
1649 spin_unlock_irq(&mddev
->write_lock
);
1650 wake_up(&mddev
->sb_wait
);
1653 spin_unlock_irq(&mddev
->write_lock
);
1656 "md: updating %s RAID superblock on device (in sync %d)\n",
1657 mdname(mddev
),mddev
->in_sync
);
1659 err
= bitmap_update_sb(mddev
->bitmap
);
1660 ITERATE_RDEV(mddev
,rdev
,tmp
) {
1661 char b
[BDEVNAME_SIZE
];
1662 dprintk(KERN_INFO
"md: ");
1663 if (rdev
->sb_loaded
!= 1)
1664 continue; /* no noise on spare devices */
1665 if (test_bit(Faulty
, &rdev
->flags
))
1666 dprintk("(skipping faulty ");
1668 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1669 if (!test_bit(Faulty
, &rdev
->flags
)) {
1670 md_super_write(mddev
,rdev
,
1671 rdev
->sb_offset
<<1, rdev
->sb_size
,
1673 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1674 bdevname(rdev
->bdev
,b
),
1675 (unsigned long long)rdev
->sb_offset
);
1676 rdev
->sb_events
= mddev
->events
;
1680 if (mddev
->level
== LEVEL_MULTIPATH
)
1681 /* only need to write one superblock... */
1684 md_super_wait(mddev
);
1685 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1687 spin_lock_irq(&mddev
->write_lock
);
1688 if (mddev
->in_sync
!= sync_req
|| mddev
->sb_dirty
== 1) {
1689 /* have to write it out again */
1690 spin_unlock_irq(&mddev
->write_lock
);
1693 mddev
->sb_dirty
= 0;
1694 spin_unlock_irq(&mddev
->write_lock
);
1695 wake_up(&mddev
->sb_wait
);
1698 EXPORT_SYMBOL_GPL(md_update_sb
);
1700 /* words written to sysfs files may, or my not, be \n terminated.
1701 * We want to accept with case. For this we use cmd_match.
1703 static int cmd_match(const char *cmd
, const char *str
)
1705 /* See if cmd, written into a sysfs file, matches
1706 * str. They must either be the same, or cmd can
1707 * have a trailing newline
1709 while (*cmd
&& *str
&& *cmd
== *str
) {
1720 struct rdev_sysfs_entry
{
1721 struct attribute attr
;
1722 ssize_t (*show
)(mdk_rdev_t
*, char *);
1723 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
1727 state_show(mdk_rdev_t
*rdev
, char *page
)
1732 if (test_bit(Faulty
, &rdev
->flags
)) {
1733 len
+= sprintf(page
+len
, "%sfaulty",sep
);
1736 if (test_bit(In_sync
, &rdev
->flags
)) {
1737 len
+= sprintf(page
+len
, "%sin_sync",sep
);
1740 if (!test_bit(Faulty
, &rdev
->flags
) &&
1741 !test_bit(In_sync
, &rdev
->flags
)) {
1742 len
+= sprintf(page
+len
, "%sspare", sep
);
1745 return len
+sprintf(page
+len
, "\n");
1749 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1752 * faulty - simulates and error
1753 * remove - disconnects the device
1756 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
1757 md_error(rdev
->mddev
, rdev
);
1759 } else if (cmd_match(buf
, "remove")) {
1760 if (rdev
->raid_disk
>= 0)
1763 mddev_t
*mddev
= rdev
->mddev
;
1764 kick_rdev_from_array(rdev
);
1765 md_update_sb(mddev
);
1766 md_new_event(mddev
);
1770 return err
? err
: len
;
1772 static struct rdev_sysfs_entry
1773 rdev_state
= __ATTR(state
, 0644, state_show
, state_store
);
1776 super_show(mdk_rdev_t
*rdev
, char *page
)
1778 if (rdev
->sb_loaded
&& rdev
->sb_size
) {
1779 memcpy(page
, page_address(rdev
->sb_page
), rdev
->sb_size
);
1780 return rdev
->sb_size
;
1784 static struct rdev_sysfs_entry rdev_super
= __ATTR_RO(super
);
1787 errors_show(mdk_rdev_t
*rdev
, char *page
)
1789 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
1793 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1796 unsigned long n
= simple_strtoul(buf
, &e
, 10);
1797 if (*buf
&& (*e
== 0 || *e
== '\n')) {
1798 atomic_set(&rdev
->corrected_errors
, n
);
1803 static struct rdev_sysfs_entry rdev_errors
=
1804 __ATTR(errors
, 0644, errors_show
, errors_store
);
1807 slot_show(mdk_rdev_t
*rdev
, char *page
)
1809 if (rdev
->raid_disk
< 0)
1810 return sprintf(page
, "none\n");
1812 return sprintf(page
, "%d\n", rdev
->raid_disk
);
1816 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1819 int slot
= simple_strtoul(buf
, &e
, 10);
1820 if (strncmp(buf
, "none", 4)==0)
1822 else if (e
==buf
|| (*e
&& *e
!= '\n'))
1824 if (rdev
->mddev
->pers
)
1825 /* Cannot set slot in active array (yet) */
1827 if (slot
>= rdev
->mddev
->raid_disks
)
1829 rdev
->raid_disk
= slot
;
1830 /* assume it is working */
1832 set_bit(In_sync
, &rdev
->flags
);
1837 static struct rdev_sysfs_entry rdev_slot
=
1838 __ATTR(slot
, 0644, slot_show
, slot_store
);
1841 offset_show(mdk_rdev_t
*rdev
, char *page
)
1843 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
1847 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1850 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
1851 if (e
==buf
|| (*e
&& *e
!= '\n'))
1853 if (rdev
->mddev
->pers
)
1855 rdev
->data_offset
= offset
;
1859 static struct rdev_sysfs_entry rdev_offset
=
1860 __ATTR(offset
, 0644, offset_show
, offset_store
);
1863 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
1865 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->size
);
1869 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
1872 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
1873 if (e
==buf
|| (*e
&& *e
!= '\n'))
1875 if (rdev
->mddev
->pers
)
1878 if (size
< rdev
->mddev
->size
|| rdev
->mddev
->size
== 0)
1879 rdev
->mddev
->size
= size
;
1883 static struct rdev_sysfs_entry rdev_size
=
1884 __ATTR(size
, 0644, rdev_size_show
, rdev_size_store
);
1886 static struct attribute
*rdev_default_attrs
[] = {
1896 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
1898 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1899 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1903 return entry
->show(rdev
, page
);
1907 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
1908 const char *page
, size_t length
)
1910 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
1911 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
1915 return entry
->store(rdev
, page
, length
);
1918 static void rdev_free(struct kobject
*ko
)
1920 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
1923 static struct sysfs_ops rdev_sysfs_ops
= {
1924 .show
= rdev_attr_show
,
1925 .store
= rdev_attr_store
,
1927 static struct kobj_type rdev_ktype
= {
1928 .release
= rdev_free
,
1929 .sysfs_ops
= &rdev_sysfs_ops
,
1930 .default_attrs
= rdev_default_attrs
,
1934 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1936 * mark the device faulty if:
1938 * - the device is nonexistent (zero size)
1939 * - the device has no valid superblock
1941 * a faulty rdev _never_ has rdev->sb set.
1943 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
1945 char b
[BDEVNAME_SIZE
];
1950 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
1952 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
1953 return ERR_PTR(-ENOMEM
);
1956 if ((err
= alloc_disk_sb(rdev
)))
1959 err
= lock_rdev(rdev
, newdev
);
1963 rdev
->kobj
.parent
= NULL
;
1964 rdev
->kobj
.ktype
= &rdev_ktype
;
1965 kobject_init(&rdev
->kobj
);
1969 rdev
->data_offset
= 0;
1970 rdev
->sb_events
= 0;
1971 atomic_set(&rdev
->nr_pending
, 0);
1972 atomic_set(&rdev
->read_errors
, 0);
1973 atomic_set(&rdev
->corrected_errors
, 0);
1975 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
1978 "md: %s has zero or unknown size, marking faulty!\n",
1979 bdevname(rdev
->bdev
,b
));
1984 if (super_format
>= 0) {
1985 err
= super_types
[super_format
].
1986 load_super(rdev
, NULL
, super_minor
);
1987 if (err
== -EINVAL
) {
1989 "md: %s has invalid sb, not importing!\n",
1990 bdevname(rdev
->bdev
,b
));
1995 "md: could not read %s's sb, not importing!\n",
1996 bdevname(rdev
->bdev
,b
));
2000 INIT_LIST_HEAD(&rdev
->same_set
);
2005 if (rdev
->sb_page
) {
2011 return ERR_PTR(err
);
2015 * Check a full RAID array for plausibility
2019 static void analyze_sbs(mddev_t
* mddev
)
2022 struct list_head
*tmp
;
2023 mdk_rdev_t
*rdev
, *freshest
;
2024 char b
[BDEVNAME_SIZE
];
2027 ITERATE_RDEV(mddev
,rdev
,tmp
)
2028 switch (super_types
[mddev
->major_version
].
2029 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2037 "md: fatal superblock inconsistency in %s"
2038 " -- removing from array\n",
2039 bdevname(rdev
->bdev
,b
));
2040 kick_rdev_from_array(rdev
);
2044 super_types
[mddev
->major_version
].
2045 validate_super(mddev
, freshest
);
2048 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2049 if (rdev
!= freshest
)
2050 if (super_types
[mddev
->major_version
].
2051 validate_super(mddev
, rdev
)) {
2052 printk(KERN_WARNING
"md: kicking non-fresh %s"
2054 bdevname(rdev
->bdev
,b
));
2055 kick_rdev_from_array(rdev
);
2058 if (mddev
->level
== LEVEL_MULTIPATH
) {
2059 rdev
->desc_nr
= i
++;
2060 rdev
->raid_disk
= rdev
->desc_nr
;
2061 set_bit(In_sync
, &rdev
->flags
);
2067 if (mddev
->recovery_cp
!= MaxSector
&&
2069 printk(KERN_ERR
"md: %s: raid array is not clean"
2070 " -- starting background reconstruction\n",
2076 safe_delay_show(mddev_t
*mddev
, char *page
)
2078 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2079 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2082 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2090 /* remove a period, and count digits after it */
2091 if (len
>= sizeof(buf
))
2093 strlcpy(buf
, cbuf
, len
);
2095 for (i
=0; i
<len
; i
++) {
2097 if (isdigit(buf
[i
])) {
2102 } else if (buf
[i
] == '.') {
2107 msec
= simple_strtoul(buf
, &e
, 10);
2108 if (e
== buf
|| (*e
&& *e
!= '\n'))
2110 msec
= (msec
* 1000) / scale
;
2112 mddev
->safemode_delay
= 0;
2114 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2115 if (mddev
->safemode_delay
== 0)
2116 mddev
->safemode_delay
= 1;
2120 static struct md_sysfs_entry md_safe_delay
=
2121 __ATTR(safe_mode_delay
, 0644,safe_delay_show
, safe_delay_store
);
2124 level_show(mddev_t
*mddev
, char *page
)
2126 struct mdk_personality
*p
= mddev
->pers
;
2128 return sprintf(page
, "%s\n", p
->name
);
2129 else if (mddev
->clevel
[0])
2130 return sprintf(page
, "%s\n", mddev
->clevel
);
2131 else if (mddev
->level
!= LEVEL_NONE
)
2132 return sprintf(page
, "%d\n", mddev
->level
);
2138 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2145 if (len
>= sizeof(mddev
->clevel
))
2147 strncpy(mddev
->clevel
, buf
, len
);
2148 if (mddev
->clevel
[len
-1] == '\n')
2150 mddev
->clevel
[len
] = 0;
2151 mddev
->level
= LEVEL_NONE
;
2155 static struct md_sysfs_entry md_level
=
2156 __ATTR(level
, 0644, level_show
, level_store
);
2160 layout_show(mddev_t
*mddev
, char *page
)
2162 /* just a number, not meaningful for all levels */
2163 return sprintf(page
, "%d\n", mddev
->layout
);
2167 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2170 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2174 if (!*buf
|| (*e
&& *e
!= '\n'))
2180 static struct md_sysfs_entry md_layout
=
2181 __ATTR(layout
, 0655, layout_show
, layout_store
);
2185 raid_disks_show(mddev_t
*mddev
, char *page
)
2187 if (mddev
->raid_disks
== 0)
2189 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2192 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2195 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2197 /* can only set raid_disks if array is not yet active */
2200 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2202 if (!*buf
|| (*e
&& *e
!= '\n'))
2206 rv
= update_raid_disks(mddev
, n
);
2208 mddev
->raid_disks
= n
;
2209 return rv
? rv
: len
;
2211 static struct md_sysfs_entry md_raid_disks
=
2212 __ATTR(raid_disks
, 0644, raid_disks_show
, raid_disks_store
);
2215 chunk_size_show(mddev_t
*mddev
, char *page
)
2217 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2221 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2223 /* can only set chunk_size if array is not yet active */
2225 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2229 if (!*buf
|| (*e
&& *e
!= '\n'))
2232 mddev
->chunk_size
= n
;
2235 static struct md_sysfs_entry md_chunk_size
=
2236 __ATTR(chunk_size
, 0644, chunk_size_show
, chunk_size_store
);
2239 * The array state can be:
2242 * No devices, no size, no level
2243 * Equivalent to STOP_ARRAY ioctl
2245 * May have some settings, but array is not active
2246 * all IO results in error
2247 * When written, doesn't tear down array, but just stops it
2248 * suspended (not supported yet)
2249 * All IO requests will block. The array can be reconfigured.
2250 * Writing this, if accepted, will block until array is quiessent
2252 * no resync can happen. no superblocks get written.
2253 * write requests fail
2255 * like readonly, but behaves like 'clean' on a write request.
2257 * clean - no pending writes, but otherwise active.
2258 * When written to inactive array, starts without resync
2259 * If a write request arrives then
2260 * if metadata is known, mark 'dirty' and switch to 'active'.
2261 * if not known, block and switch to write-pending
2262 * If written to an active array that has pending writes, then fails.
2264 * fully active: IO and resync can be happening.
2265 * When written to inactive array, starts with resync
2268 * clean, but writes are blocked waiting for 'active' to be written.
2271 * like active, but no writes have been seen for a while (100msec).
2274 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2275 write_pending
, active_idle
, bad_word
};
2276 char *array_states
[] = {
2277 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2278 "write-pending", "active-idle", NULL
};
2280 static int match_word(const char *word
, char **list
)
2283 for (n
=0; list
[n
]; n
++)
2284 if (cmd_match(word
, list
[n
]))
2290 array_state_show(mddev_t
*mddev
, char *page
)
2292 enum array_state st
= inactive
;
2305 else if (mddev
->safemode
)
2311 if (list_empty(&mddev
->disks
) &&
2312 mddev
->raid_disks
== 0 &&
2318 return sprintf(page
, "%s\n", array_states
[st
]);
2321 static int do_md_stop(mddev_t
* mddev
, int ro
);
2322 static int do_md_run(mddev_t
* mddev
);
2323 static int restart_array(mddev_t
*mddev
);
2326 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2329 enum array_state st
= match_word(buf
, array_states
);
2334 /* stopping an active array */
2336 if (atomic_read(&mddev
->active
) > 1)
2338 err
= do_md_stop(mddev
, 0);
2342 /* stopping an active array */
2344 if (atomic_read(&mddev
->active
) > 1)
2346 err
= do_md_stop(mddev
, 2);
2350 break; /* not supported yet */
2353 err
= do_md_stop(mddev
, 1);
2356 err
= do_md_run(mddev
);
2360 /* stopping an active array */
2362 err
= do_md_stop(mddev
, 1);
2364 mddev
->ro
= 2; /* FIXME mark devices writable */
2367 err
= do_md_run(mddev
);
2372 restart_array(mddev
);
2373 spin_lock_irq(&mddev
->write_lock
);
2374 if (atomic_read(&mddev
->writes_pending
) == 0) {
2376 mddev
->sb_dirty
= 1;
2378 spin_unlock_irq(&mddev
->write_lock
);
2381 mddev
->recovery_cp
= MaxSector
;
2382 err
= do_md_run(mddev
);
2387 restart_array(mddev
);
2388 mddev
->sb_dirty
= 0;
2389 wake_up(&mddev
->sb_wait
);
2393 err
= do_md_run(mddev
);
2398 /* these cannot be set */
2406 static struct md_sysfs_entry md_array_state
= __ATTR(array_state
, 0644, array_state_show
, array_state_store
);
2409 null_show(mddev_t
*mddev
, char *page
)
2415 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2417 /* buf must be %d:%d\n? giving major and minor numbers */
2418 /* The new device is added to the array.
2419 * If the array has a persistent superblock, we read the
2420 * superblock to initialise info and check validity.
2421 * Otherwise, only checking done is that in bind_rdev_to_array,
2422 * which mainly checks size.
2425 int major
= simple_strtoul(buf
, &e
, 10);
2431 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
2433 minor
= simple_strtoul(e
+1, &e
, 10);
2434 if (*e
&& *e
!= '\n')
2436 dev
= MKDEV(major
, minor
);
2437 if (major
!= MAJOR(dev
) ||
2438 minor
!= MINOR(dev
))
2442 if (mddev
->persistent
) {
2443 rdev
= md_import_device(dev
, mddev
->major_version
,
2444 mddev
->minor_version
);
2445 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
2446 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
2447 mdk_rdev_t
, same_set
);
2448 err
= super_types
[mddev
->major_version
]
2449 .load_super(rdev
, rdev0
, mddev
->minor_version
);
2454 rdev
= md_import_device(dev
, -1, -1);
2457 return PTR_ERR(rdev
);
2458 err
= bind_rdev_to_array(rdev
, mddev
);
2462 return err
? err
: len
;
2465 static struct md_sysfs_entry md_new_device
=
2466 __ATTR(new_dev
, 0200, null_show
, new_dev_store
);
2469 size_show(mddev_t
*mddev
, char *page
)
2471 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->size
);
2474 static int update_size(mddev_t
*mddev
, unsigned long size
);
2477 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2479 /* If array is inactive, we can reduce the component size, but
2480 * not increase it (except from 0).
2481 * If array is active, we can try an on-line resize
2485 unsigned long long size
= simple_strtoull(buf
, &e
, 10);
2486 if (!*buf
|| *buf
== '\n' ||
2491 err
= update_size(mddev
, size
);
2492 md_update_sb(mddev
);
2494 if (mddev
->size
== 0 ||
2500 return err
? err
: len
;
2503 static struct md_sysfs_entry md_size
=
2504 __ATTR(component_size
, 0644, size_show
, size_store
);
2508 * This is either 'none' for arrays with externally managed metadata,
2509 * or N.M for internally known formats
2512 metadata_show(mddev_t
*mddev
, char *page
)
2514 if (mddev
->persistent
)
2515 return sprintf(page
, "%d.%d\n",
2516 mddev
->major_version
, mddev
->minor_version
);
2518 return sprintf(page
, "none\n");
2522 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2526 if (!list_empty(&mddev
->disks
))
2529 if (cmd_match(buf
, "none")) {
2530 mddev
->persistent
= 0;
2531 mddev
->major_version
= 0;
2532 mddev
->minor_version
= 90;
2535 major
= simple_strtoul(buf
, &e
, 10);
2536 if (e
==buf
|| *e
!= '.')
2539 minor
= simple_strtoul(buf
, &e
, 10);
2540 if (e
==buf
|| *e
!= '\n')
2542 if (major
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
2543 super_types
[major
].name
== NULL
)
2545 mddev
->major_version
= major
;
2546 mddev
->minor_version
= minor
;
2547 mddev
->persistent
= 1;
2551 static struct md_sysfs_entry md_metadata
=
2552 __ATTR(metadata_version
, 0644, metadata_show
, metadata_store
);
2555 action_show(mddev_t
*mddev
, char *page
)
2557 char *type
= "idle";
2558 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2559 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
)) {
2560 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
2562 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
2563 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
2565 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
2572 return sprintf(page
, "%s\n", type
);
2576 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
2578 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
2581 if (cmd_match(page
, "idle")) {
2582 if (mddev
->sync_thread
) {
2583 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
2584 md_unregister_thread(mddev
->sync_thread
);
2585 mddev
->sync_thread
= NULL
;
2586 mddev
->recovery
= 0;
2588 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
2589 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
2591 else if (cmd_match(page
, "resync") || cmd_match(page
, "recover"))
2592 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2593 else if (cmd_match(page
, "reshape")) {
2595 if (mddev
->pers
->start_reshape
== NULL
)
2597 err
= mddev
->pers
->start_reshape(mddev
);
2601 if (cmd_match(page
, "check"))
2602 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
2603 else if (!cmd_match(page
, "repair"))
2605 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
2606 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
2608 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2609 md_wakeup_thread(mddev
->thread
);
2614 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
2616 return sprintf(page
, "%llu\n",
2617 (unsigned long long) mddev
->resync_mismatches
);
2620 static struct md_sysfs_entry
2621 md_scan_mode
= __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
2624 static struct md_sysfs_entry
2625 md_mismatches
= __ATTR_RO(mismatch_cnt
);
2628 sync_min_show(mddev_t
*mddev
, char *page
)
2630 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
2631 mddev
->sync_speed_min
? "local": "system");
2635 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2639 if (strncmp(buf
, "system", 6)==0) {
2640 mddev
->sync_speed_min
= 0;
2643 min
= simple_strtoul(buf
, &e
, 10);
2644 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
2646 mddev
->sync_speed_min
= min
;
2650 static struct md_sysfs_entry md_sync_min
=
2651 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
2654 sync_max_show(mddev_t
*mddev
, char *page
)
2656 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
2657 mddev
->sync_speed_max
? "local": "system");
2661 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2665 if (strncmp(buf
, "system", 6)==0) {
2666 mddev
->sync_speed_max
= 0;
2669 max
= simple_strtoul(buf
, &e
, 10);
2670 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
2672 mddev
->sync_speed_max
= max
;
2676 static struct md_sysfs_entry md_sync_max
=
2677 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
2681 sync_speed_show(mddev_t
*mddev
, char *page
)
2683 unsigned long resync
, dt
, db
;
2684 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2685 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
2687 db
= resync
- (mddev
->resync_mark_cnt
);
2688 return sprintf(page
, "%ld\n", db
/dt
/2); /* K/sec */
2691 static struct md_sysfs_entry
2692 md_sync_speed
= __ATTR_RO(sync_speed
);
2695 sync_completed_show(mddev_t
*mddev
, char *page
)
2697 unsigned long max_blocks
, resync
;
2699 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
2700 max_blocks
= mddev
->resync_max_sectors
;
2702 max_blocks
= mddev
->size
<< 1;
2704 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
2705 return sprintf(page
, "%lu / %lu\n", resync
, max_blocks
);
2708 static struct md_sysfs_entry
2709 md_sync_completed
= __ATTR_RO(sync_completed
);
2712 suspend_lo_show(mddev_t
*mddev
, char *page
)
2714 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
2718 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2721 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2723 if (mddev
->pers
->quiesce
== NULL
)
2725 if (buf
== e
|| (*e
&& *e
!= '\n'))
2727 if (new >= mddev
->suspend_hi
||
2728 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
2729 mddev
->suspend_lo
= new;
2730 mddev
->pers
->quiesce(mddev
, 2);
2735 static struct md_sysfs_entry md_suspend_lo
=
2736 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
2740 suspend_hi_show(mddev_t
*mddev
, char *page
)
2742 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
2746 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2749 unsigned long long new = simple_strtoull(buf
, &e
, 10);
2751 if (mddev
->pers
->quiesce
== NULL
)
2753 if (buf
== e
|| (*e
&& *e
!= '\n'))
2755 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
2756 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
2757 mddev
->suspend_hi
= new;
2758 mddev
->pers
->quiesce(mddev
, 1);
2759 mddev
->pers
->quiesce(mddev
, 0);
2764 static struct md_sysfs_entry md_suspend_hi
=
2765 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
2768 static struct attribute
*md_default_attrs
[] = {
2771 &md_raid_disks
.attr
,
2772 &md_chunk_size
.attr
,
2775 &md_new_device
.attr
,
2776 &md_safe_delay
.attr
,
2777 &md_array_state
.attr
,
2781 static struct attribute
*md_redundancy_attrs
[] = {
2783 &md_mismatches
.attr
,
2786 &md_sync_speed
.attr
,
2787 &md_sync_completed
.attr
,
2788 &md_suspend_lo
.attr
,
2789 &md_suspend_hi
.attr
,
2792 static struct attribute_group md_redundancy_group
= {
2794 .attrs
= md_redundancy_attrs
,
2799 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2801 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2802 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2807 rv
= mddev_lock(mddev
);
2809 rv
= entry
->show(mddev
, page
);
2810 mddev_unlock(mddev
);
2816 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2817 const char *page
, size_t length
)
2819 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
2820 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
2825 rv
= mddev_lock(mddev
);
2827 rv
= entry
->store(mddev
, page
, length
);
2828 mddev_unlock(mddev
);
2833 static void md_free(struct kobject
*ko
)
2835 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
2839 static struct sysfs_ops md_sysfs_ops
= {
2840 .show
= md_attr_show
,
2841 .store
= md_attr_store
,
2843 static struct kobj_type md_ktype
= {
2845 .sysfs_ops
= &md_sysfs_ops
,
2846 .default_attrs
= md_default_attrs
,
2851 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
2853 static DEFINE_MUTEX(disks_mutex
);
2854 mddev_t
*mddev
= mddev_find(dev
);
2855 struct gendisk
*disk
;
2856 int partitioned
= (MAJOR(dev
) != MD_MAJOR
);
2857 int shift
= partitioned
? MdpMinorShift
: 0;
2858 int unit
= MINOR(dev
) >> shift
;
2863 mutex_lock(&disks_mutex
);
2864 if (mddev
->gendisk
) {
2865 mutex_unlock(&disks_mutex
);
2869 disk
= alloc_disk(1 << shift
);
2871 mutex_unlock(&disks_mutex
);
2875 disk
->major
= MAJOR(dev
);
2876 disk
->first_minor
= unit
<< shift
;
2878 sprintf(disk
->disk_name
, "md_d%d", unit
);
2879 sprintf(disk
->devfs_name
, "md/d%d", unit
);
2881 sprintf(disk
->disk_name
, "md%d", unit
);
2882 sprintf(disk
->devfs_name
, "md/%d", unit
);
2884 disk
->fops
= &md_fops
;
2885 disk
->private_data
= mddev
;
2886 disk
->queue
= mddev
->queue
;
2888 mddev
->gendisk
= disk
;
2889 mutex_unlock(&disks_mutex
);
2890 mddev
->kobj
.parent
= &disk
->kobj
;
2891 mddev
->kobj
.k_name
= NULL
;
2892 snprintf(mddev
->kobj
.name
, KOBJ_NAME_LEN
, "%s", "md");
2893 mddev
->kobj
.ktype
= &md_ktype
;
2894 kobject_register(&mddev
->kobj
);
2898 static void md_safemode_timeout(unsigned long data
)
2900 mddev_t
*mddev
= (mddev_t
*) data
;
2902 mddev
->safemode
= 1;
2903 md_wakeup_thread(mddev
->thread
);
2906 static int start_dirty_degraded
;
2908 static int do_md_run(mddev_t
* mddev
)
2912 struct list_head
*tmp
;
2914 struct gendisk
*disk
;
2915 struct mdk_personality
*pers
;
2916 char b
[BDEVNAME_SIZE
];
2918 if (list_empty(&mddev
->disks
))
2919 /* cannot run an array with no devices.. */
2926 * Analyze all RAID superblock(s)
2928 if (!mddev
->raid_disks
)
2931 chunk_size
= mddev
->chunk_size
;
2934 if (chunk_size
> MAX_CHUNK_SIZE
) {
2935 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
2936 chunk_size
, MAX_CHUNK_SIZE
);
2940 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2942 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
2943 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
2946 if (chunk_size
< PAGE_SIZE
) {
2947 printk(KERN_ERR
"too small chunk_size: %d < %ld\n",
2948 chunk_size
, PAGE_SIZE
);
2952 /* devices must have minimum size of one chunk */
2953 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2954 if (test_bit(Faulty
, &rdev
->flags
))
2956 if (rdev
->size
< chunk_size
/ 1024) {
2958 "md: Dev %s smaller than chunk_size:"
2960 bdevname(rdev
->bdev
,b
),
2961 (unsigned long long)rdev
->size
,
2969 if (mddev
->level
!= LEVEL_NONE
)
2970 request_module("md-level-%d", mddev
->level
);
2971 else if (mddev
->clevel
[0])
2972 request_module("md-%s", mddev
->clevel
);
2976 * Drop all container device buffers, from now on
2977 * the only valid external interface is through the md
2979 * Also find largest hardsector size
2981 ITERATE_RDEV(mddev
,rdev
,tmp
) {
2982 if (test_bit(Faulty
, &rdev
->flags
))
2984 sync_blockdev(rdev
->bdev
);
2985 invalidate_bdev(rdev
->bdev
, 0);
2988 md_probe(mddev
->unit
, NULL
, NULL
);
2989 disk
= mddev
->gendisk
;
2993 spin_lock(&pers_lock
);
2994 pers
= find_pers(mddev
->level
, mddev
->clevel
);
2995 if (!pers
|| !try_module_get(pers
->owner
)) {
2996 spin_unlock(&pers_lock
);
2997 if (mddev
->level
!= LEVEL_NONE
)
2998 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
3001 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
3006 spin_unlock(&pers_lock
);
3007 mddev
->level
= pers
->level
;
3008 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3010 if (mddev
->reshape_position
!= MaxSector
&&
3011 pers
->start_reshape
== NULL
) {
3012 /* This personality cannot handle reshaping... */
3014 module_put(pers
->owner
);
3018 mddev
->recovery
= 0;
3019 mddev
->resync_max_sectors
= mddev
->size
<< 1; /* may be over-ridden by personality */
3020 mddev
->barriers_work
= 1;
3021 mddev
->ok_start_degraded
= start_dirty_degraded
;
3024 mddev
->ro
= 2; /* read-only, but switch on first write */
3026 err
= mddev
->pers
->run(mddev
);
3027 if (!err
&& mddev
->pers
->sync_request
) {
3028 err
= bitmap_create(mddev
);
3030 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
3031 mdname(mddev
), err
);
3032 mddev
->pers
->stop(mddev
);
3036 printk(KERN_ERR
"md: pers->run() failed ...\n");
3037 module_put(mddev
->pers
->owner
);
3039 bitmap_destroy(mddev
);
3042 if (mddev
->pers
->sync_request
)
3043 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
);
3044 else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
3047 atomic_set(&mddev
->writes_pending
,0);
3048 mddev
->safemode
= 0;
3049 mddev
->safemode_timer
.function
= md_safemode_timeout
;
3050 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
3051 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
3054 ITERATE_RDEV(mddev
,rdev
,tmp
)
3055 if (rdev
->raid_disk
>= 0) {
3057 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3058 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
3061 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3062 md_wakeup_thread(mddev
->thread
);
3064 if (mddev
->sb_dirty
)
3065 md_update_sb(mddev
);
3067 set_capacity(disk
, mddev
->array_size
<<1);
3069 /* If we call blk_queue_make_request here, it will
3070 * re-initialise max_sectors etc which may have been
3071 * refined inside -> run. So just set the bits we need to set.
3072 * Most initialisation happended when we called
3073 * blk_queue_make_request(..., md_fail_request)
3076 mddev
->queue
->queuedata
= mddev
;
3077 mddev
->queue
->make_request_fn
= mddev
->pers
->make_request
;
3079 /* If there is a partially-recovered drive we need to
3080 * start recovery here. If we leave it to md_check_recovery,
3081 * it will remove the drives and not do the right thing
3083 if (mddev
->degraded
) {
3084 struct list_head
*rtmp
;
3086 ITERATE_RDEV(mddev
,rdev
,rtmp
)
3087 if (rdev
->raid_disk
>= 0 &&
3088 !test_bit(In_sync
, &rdev
->flags
) &&
3089 !test_bit(Faulty
, &rdev
->flags
))
3090 /* complete an interrupted recovery */
3092 if (spares
&& mddev
->pers
->sync_request
) {
3093 mddev
->recovery
= 0;
3094 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
3095 mddev
->sync_thread
= md_register_thread(md_do_sync
,
3098 if (!mddev
->sync_thread
) {
3099 printk(KERN_ERR
"%s: could not start resync"
3102 /* leave the spares where they are, it shouldn't hurt */
3103 mddev
->recovery
= 0;
3105 md_wakeup_thread(mddev
->sync_thread
);
3110 md_new_event(mddev
);
3114 static int restart_array(mddev_t
*mddev
)
3116 struct gendisk
*disk
= mddev
->gendisk
;
3120 * Complain if it has no devices
3123 if (list_empty(&mddev
->disks
))
3131 mddev
->safemode
= 0;
3133 set_disk_ro(disk
, 0);
3135 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
3138 * Kick recovery or resync if necessary
3140 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3141 md_wakeup_thread(mddev
->thread
);
3142 md_wakeup_thread(mddev
->sync_thread
);
3151 /* similar to deny_write_access, but accounts for our holding a reference
3152 * to the file ourselves */
3153 static int deny_bitmap_write_access(struct file
* file
)
3155 struct inode
*inode
= file
->f_mapping
->host
;
3157 spin_lock(&inode
->i_lock
);
3158 if (atomic_read(&inode
->i_writecount
) > 1) {
3159 spin_unlock(&inode
->i_lock
);
3162 atomic_set(&inode
->i_writecount
, -1);
3163 spin_unlock(&inode
->i_lock
);
3168 static void restore_bitmap_write_access(struct file
*file
)
3170 struct inode
*inode
= file
->f_mapping
->host
;
3172 spin_lock(&inode
->i_lock
);
3173 atomic_set(&inode
->i_writecount
, 1);
3174 spin_unlock(&inode
->i_lock
);
3178 * 0 - completely stop and dis-assemble array
3179 * 1 - switch to readonly
3180 * 2 - stop but do not disassemble array
3182 static int do_md_stop(mddev_t
* mddev
, int mode
)
3185 struct gendisk
*disk
= mddev
->gendisk
;
3188 if (atomic_read(&mddev
->active
)>2) {
3189 printk("md: %s still in use.\n",mdname(mddev
));
3193 if (mddev
->sync_thread
) {
3194 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3195 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3196 md_unregister_thread(mddev
->sync_thread
);
3197 mddev
->sync_thread
= NULL
;
3200 del_timer_sync(&mddev
->safemode_timer
);
3202 invalidate_partition(disk
, 0);
3205 case 1: /* readonly */
3211 case 0: /* disassemble */
3213 bitmap_flush(mddev
);
3214 md_super_wait(mddev
);
3216 set_disk_ro(disk
, 0);
3217 blk_queue_make_request(mddev
->queue
, md_fail_request
);
3218 mddev
->pers
->stop(mddev
);
3219 if (mddev
->pers
->sync_request
)
3220 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3222 module_put(mddev
->pers
->owner
);
3227 if (!mddev
->in_sync
|| mddev
->sb_dirty
) {
3228 /* mark array as shutdown cleanly */
3230 md_update_sb(mddev
);
3233 set_disk_ro(disk
, 1);
3234 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3238 * Free resources if final stop
3242 struct list_head
*tmp
;
3243 struct gendisk
*disk
;
3244 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
3246 bitmap_destroy(mddev
);
3247 if (mddev
->bitmap_file
) {
3248 restore_bitmap_write_access(mddev
->bitmap_file
);
3249 fput(mddev
->bitmap_file
);
3250 mddev
->bitmap_file
= NULL
;
3252 mddev
->bitmap_offset
= 0;
3254 ITERATE_RDEV(mddev
,rdev
,tmp
)
3255 if (rdev
->raid_disk
>= 0) {
3257 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3258 sysfs_remove_link(&mddev
->kobj
, nm
);
3261 export_array(mddev
);
3263 mddev
->array_size
= 0;
3265 mddev
->raid_disks
= 0;
3267 disk
= mddev
->gendisk
;
3269 set_capacity(disk
, 0);
3271 } else if (mddev
->pers
)
3272 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
3275 md_new_event(mddev
);
3280 static void autorun_array(mddev_t
*mddev
)
3283 struct list_head
*tmp
;
3286 if (list_empty(&mddev
->disks
))
3289 printk(KERN_INFO
"md: running: ");
3291 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3292 char b
[BDEVNAME_SIZE
];
3293 printk("<%s>", bdevname(rdev
->bdev
,b
));
3297 err
= do_md_run (mddev
);
3299 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
3300 do_md_stop (mddev
, 0);
3305 * lets try to run arrays based on all disks that have arrived
3306 * until now. (those are in pending_raid_disks)
3308 * the method: pick the first pending disk, collect all disks with
3309 * the same UUID, remove all from the pending list and put them into
3310 * the 'same_array' list. Then order this list based on superblock
3311 * update time (freshest comes first), kick out 'old' disks and
3312 * compare superblocks. If everything's fine then run it.
3314 * If "unit" is allocated, then bump its reference count
3316 static void autorun_devices(int part
)
3318 struct list_head
*tmp
;
3319 mdk_rdev_t
*rdev0
, *rdev
;
3321 char b
[BDEVNAME_SIZE
];
3323 printk(KERN_INFO
"md: autorun ...\n");
3324 while (!list_empty(&pending_raid_disks
)) {
3326 LIST_HEAD(candidates
);
3327 rdev0
= list_entry(pending_raid_disks
.next
,
3328 mdk_rdev_t
, same_set
);
3330 printk(KERN_INFO
"md: considering %s ...\n",
3331 bdevname(rdev0
->bdev
,b
));
3332 INIT_LIST_HEAD(&candidates
);
3333 ITERATE_RDEV_PENDING(rdev
,tmp
)
3334 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
3335 printk(KERN_INFO
"md: adding %s ...\n",
3336 bdevname(rdev
->bdev
,b
));
3337 list_move(&rdev
->same_set
, &candidates
);
3340 * now we have a set of devices, with all of them having
3341 * mostly sane superblocks. It's time to allocate the
3344 if (rdev0
->preferred_minor
< 0 || rdev0
->preferred_minor
>= MAX_MD_DEVS
) {
3345 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
3346 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
3350 dev
= MKDEV(mdp_major
,
3351 rdev0
->preferred_minor
<< MdpMinorShift
);
3353 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
3355 md_probe(dev
, NULL
, NULL
);
3356 mddev
= mddev_find(dev
);
3359 "md: cannot allocate memory for md drive.\n");
3362 if (mddev_lock(mddev
))
3363 printk(KERN_WARNING
"md: %s locked, cannot run\n",
3365 else if (mddev
->raid_disks
|| mddev
->major_version
3366 || !list_empty(&mddev
->disks
)) {
3368 "md: %s already running, cannot run %s\n",
3369 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
3370 mddev_unlock(mddev
);
3372 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
3373 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
) {
3374 list_del_init(&rdev
->same_set
);
3375 if (bind_rdev_to_array(rdev
, mddev
))
3378 autorun_array(mddev
);
3379 mddev_unlock(mddev
);
3381 /* on success, candidates will be empty, on error
3384 ITERATE_RDEV_GENERIC(candidates
,rdev
,tmp
)
3388 printk(KERN_INFO
"md: ... autorun DONE.\n");
3392 * import RAID devices based on one partition
3393 * if possible, the array gets run as well.
3396 static int autostart_array(dev_t startdev
)
3398 char b
[BDEVNAME_SIZE
];
3399 int err
= -EINVAL
, i
;
3400 mdp_super_t
*sb
= NULL
;
3401 mdk_rdev_t
*start_rdev
= NULL
, *rdev
;
3403 start_rdev
= md_import_device(startdev
, 0, 0);
3404 if (IS_ERR(start_rdev
))
3408 /* NOTE: this can only work for 0.90.0 superblocks */
3409 sb
= (mdp_super_t
*)page_address(start_rdev
->sb_page
);
3410 if (sb
->major_version
!= 0 ||
3411 sb
->minor_version
!= 90 ) {
3412 printk(KERN_WARNING
"md: can only autostart 0.90.0 arrays\n");
3413 export_rdev(start_rdev
);
3417 if (test_bit(Faulty
, &start_rdev
->flags
)) {
3419 "md: can not autostart based on faulty %s!\n",
3420 bdevname(start_rdev
->bdev
,b
));
3421 export_rdev(start_rdev
);
3424 list_add(&start_rdev
->same_set
, &pending_raid_disks
);
3426 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
3427 mdp_disk_t
*desc
= sb
->disks
+ i
;
3428 dev_t dev
= MKDEV(desc
->major
, desc
->minor
);
3432 if (dev
== startdev
)
3434 if (MAJOR(dev
) != desc
->major
|| MINOR(dev
) != desc
->minor
)
3436 rdev
= md_import_device(dev
, 0, 0);
3440 list_add(&rdev
->same_set
, &pending_raid_disks
);
3444 * possibly return codes
3452 static int get_version(void __user
* arg
)
3456 ver
.major
= MD_MAJOR_VERSION
;
3457 ver
.minor
= MD_MINOR_VERSION
;
3458 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
3460 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
3466 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
3468 mdu_array_info_t info
;
3469 int nr
,working
,active
,failed
,spare
;
3471 struct list_head
*tmp
;
3473 nr
=working
=active
=failed
=spare
=0;
3474 ITERATE_RDEV(mddev
,rdev
,tmp
) {
3476 if (test_bit(Faulty
, &rdev
->flags
))
3480 if (test_bit(In_sync
, &rdev
->flags
))
3487 info
.major_version
= mddev
->major_version
;
3488 info
.minor_version
= mddev
->minor_version
;
3489 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
3490 info
.ctime
= mddev
->ctime
;
3491 info
.level
= mddev
->level
;
3492 info
.size
= mddev
->size
;
3493 if (info
.size
!= mddev
->size
) /* overflow */
3496 info
.raid_disks
= mddev
->raid_disks
;
3497 info
.md_minor
= mddev
->md_minor
;
3498 info
.not_persistent
= !mddev
->persistent
;
3500 info
.utime
= mddev
->utime
;
3503 info
.state
= (1<<MD_SB_CLEAN
);
3504 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
3505 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
3506 info
.active_disks
= active
;
3507 info
.working_disks
= working
;
3508 info
.failed_disks
= failed
;
3509 info
.spare_disks
= spare
;
3511 info
.layout
= mddev
->layout
;
3512 info
.chunk_size
= mddev
->chunk_size
;
3514 if (copy_to_user(arg
, &info
, sizeof(info
)))
3520 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
3522 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
3523 char *ptr
, *buf
= NULL
;
3526 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
3530 /* bitmap disabled, zero the first byte and copy out */
3531 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
3532 file
->pathname
[0] = '\0';
3536 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
3540 ptr
= file_path(mddev
->bitmap
->file
, buf
, sizeof(file
->pathname
));
3544 strcpy(file
->pathname
, ptr
);
3548 if (copy_to_user(arg
, file
, sizeof(*file
)))
3556 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
3558 mdu_disk_info_t info
;
3562 if (copy_from_user(&info
, arg
, sizeof(info
)))
3567 rdev
= find_rdev_nr(mddev
, nr
);
3569 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
3570 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
3571 info
.raid_disk
= rdev
->raid_disk
;
3573 if (test_bit(Faulty
, &rdev
->flags
))
3574 info
.state
|= (1<<MD_DISK_FAULTY
);
3575 else if (test_bit(In_sync
, &rdev
->flags
)) {
3576 info
.state
|= (1<<MD_DISK_ACTIVE
);
3577 info
.state
|= (1<<MD_DISK_SYNC
);
3579 if (test_bit(WriteMostly
, &rdev
->flags
))
3580 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
3582 info
.major
= info
.minor
= 0;
3583 info
.raid_disk
= -1;
3584 info
.state
= (1<<MD_DISK_REMOVED
);
3587 if (copy_to_user(arg
, &info
, sizeof(info
)))
3593 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
3595 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
3597 dev_t dev
= MKDEV(info
->major
,info
->minor
);
3599 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
3602 if (!mddev
->raid_disks
) {
3604 /* expecting a device which has a superblock */
3605 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
3608 "md: md_import_device returned %ld\n",
3610 return PTR_ERR(rdev
);
3612 if (!list_empty(&mddev
->disks
)) {
3613 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3614 mdk_rdev_t
, same_set
);
3615 int err
= super_types
[mddev
->major_version
]
3616 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3619 "md: %s has different UUID to %s\n",
3620 bdevname(rdev
->bdev
,b
),
3621 bdevname(rdev0
->bdev
,b2
));
3626 err
= bind_rdev_to_array(rdev
, mddev
);
3633 * add_new_disk can be used once the array is assembled
3634 * to add "hot spares". They must already have a superblock
3639 if (!mddev
->pers
->hot_add_disk
) {
3641 "%s: personality does not support diskops!\n",
3645 if (mddev
->persistent
)
3646 rdev
= md_import_device(dev
, mddev
->major_version
,
3647 mddev
->minor_version
);
3649 rdev
= md_import_device(dev
, -1, -1);
3652 "md: md_import_device returned %ld\n",
3654 return PTR_ERR(rdev
);
3656 /* set save_raid_disk if appropriate */
3657 if (!mddev
->persistent
) {
3658 if (info
->state
& (1<<MD_DISK_SYNC
) &&
3659 info
->raid_disk
< mddev
->raid_disks
)
3660 rdev
->raid_disk
= info
->raid_disk
;
3662 rdev
->raid_disk
= -1;
3664 super_types
[mddev
->major_version
].
3665 validate_super(mddev
, rdev
);
3666 rdev
->saved_raid_disk
= rdev
->raid_disk
;
3668 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
3669 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3670 set_bit(WriteMostly
, &rdev
->flags
);
3672 rdev
->raid_disk
= -1;
3673 err
= bind_rdev_to_array(rdev
, mddev
);
3674 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
3675 /* If there is hot_add_disk but no hot_remove_disk
3676 * then added disks for geometry changes,
3677 * and should be added immediately.
3679 super_types
[mddev
->major_version
].
3680 validate_super(mddev
, rdev
);
3681 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
3683 unbind_rdev_from_array(rdev
);
3688 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3689 md_wakeup_thread(mddev
->thread
);
3693 /* otherwise, add_new_disk is only allowed
3694 * for major_version==0 superblocks
3696 if (mddev
->major_version
!= 0) {
3697 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
3702 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
3704 rdev
= md_import_device (dev
, -1, 0);
3707 "md: error, md_import_device() returned %ld\n",
3709 return PTR_ERR(rdev
);
3711 rdev
->desc_nr
= info
->number
;
3712 if (info
->raid_disk
< mddev
->raid_disks
)
3713 rdev
->raid_disk
= info
->raid_disk
;
3715 rdev
->raid_disk
= -1;
3719 if (rdev
->raid_disk
< mddev
->raid_disks
)
3720 if (info
->state
& (1<<MD_DISK_SYNC
))
3721 set_bit(In_sync
, &rdev
->flags
);
3723 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
3724 set_bit(WriteMostly
, &rdev
->flags
);
3726 if (!mddev
->persistent
) {
3727 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
3728 rdev
->sb_offset
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3730 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3731 rdev
->size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3733 err
= bind_rdev_to_array(rdev
, mddev
);
3743 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
3745 char b
[BDEVNAME_SIZE
];
3751 rdev
= find_rdev(mddev
, dev
);
3755 if (rdev
->raid_disk
>= 0)
3758 kick_rdev_from_array(rdev
);
3759 md_update_sb(mddev
);
3760 md_new_event(mddev
);
3764 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ... \n",
3765 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3769 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
3771 char b
[BDEVNAME_SIZE
];
3779 if (mddev
->major_version
!= 0) {
3780 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
3781 " version-0 superblocks.\n",
3785 if (!mddev
->pers
->hot_add_disk
) {
3787 "%s: personality does not support diskops!\n",
3792 rdev
= md_import_device (dev
, -1, 0);
3795 "md: error, md_import_device() returned %ld\n",
3800 if (mddev
->persistent
)
3801 rdev
->sb_offset
= calc_dev_sboffset(rdev
->bdev
);
3804 rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
3806 size
= calc_dev_size(rdev
, mddev
->chunk_size
);
3809 if (test_bit(Faulty
, &rdev
->flags
)) {
3811 "md: can not hot-add faulty %s disk to %s!\n",
3812 bdevname(rdev
->bdev
,b
), mdname(mddev
));
3816 clear_bit(In_sync
, &rdev
->flags
);
3818 err
= bind_rdev_to_array(rdev
, mddev
);
3823 * The rest should better be atomic, we can have disk failures
3824 * noticed in interrupt contexts ...
3827 if (rdev
->desc_nr
== mddev
->max_disks
) {
3828 printk(KERN_WARNING
"%s: can not hot-add to full array!\n",
3831 goto abort_unbind_export
;
3834 rdev
->raid_disk
= -1;
3836 md_update_sb(mddev
);
3839 * Kick recovery, maybe this spare has to be added to the
3840 * array immediately.
3842 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3843 md_wakeup_thread(mddev
->thread
);
3844 md_new_event(mddev
);
3847 abort_unbind_export
:
3848 unbind_rdev_from_array(rdev
);
3855 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
3860 if (!mddev
->pers
->quiesce
)
3862 if (mddev
->recovery
|| mddev
->sync_thread
)
3864 /* we should be able to change the bitmap.. */
3870 return -EEXIST
; /* cannot add when bitmap is present */
3871 mddev
->bitmap_file
= fget(fd
);
3873 if (mddev
->bitmap_file
== NULL
) {
3874 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
3879 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
3881 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
3883 fput(mddev
->bitmap_file
);
3884 mddev
->bitmap_file
= NULL
;
3887 mddev
->bitmap_offset
= 0; /* file overrides offset */
3888 } else if (mddev
->bitmap
== NULL
)
3889 return -ENOENT
; /* cannot remove what isn't there */
3892 mddev
->pers
->quiesce(mddev
, 1);
3894 err
= bitmap_create(mddev
);
3895 if (fd
< 0 || err
) {
3896 bitmap_destroy(mddev
);
3897 fd
= -1; /* make sure to put the file */
3899 mddev
->pers
->quiesce(mddev
, 0);
3902 if (mddev
->bitmap_file
) {
3903 restore_bitmap_write_access(mddev
->bitmap_file
);
3904 fput(mddev
->bitmap_file
);
3906 mddev
->bitmap_file
= NULL
;
3913 * set_array_info is used two different ways
3914 * The original usage is when creating a new array.
3915 * In this usage, raid_disks is > 0 and it together with
3916 * level, size, not_persistent,layout,chunksize determine the
3917 * shape of the array.
3918 * This will always create an array with a type-0.90.0 superblock.
3919 * The newer usage is when assembling an array.
3920 * In this case raid_disks will be 0, and the major_version field is
3921 * use to determine which style super-blocks are to be found on the devices.
3922 * The minor and patch _version numbers are also kept incase the
3923 * super_block handler wishes to interpret them.
3925 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
3928 if (info
->raid_disks
== 0) {
3929 /* just setting version number for superblock loading */
3930 if (info
->major_version
< 0 ||
3931 info
->major_version
>= sizeof(super_types
)/sizeof(super_types
[0]) ||
3932 super_types
[info
->major_version
].name
== NULL
) {
3933 /* maybe try to auto-load a module? */
3935 "md: superblock version %d not known\n",
3936 info
->major_version
);
3939 mddev
->major_version
= info
->major_version
;
3940 mddev
->minor_version
= info
->minor_version
;
3941 mddev
->patch_version
= info
->patch_version
;
3944 mddev
->major_version
= MD_MAJOR_VERSION
;
3945 mddev
->minor_version
= MD_MINOR_VERSION
;
3946 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
3947 mddev
->ctime
= get_seconds();
3949 mddev
->level
= info
->level
;
3950 mddev
->clevel
[0] = 0;
3951 mddev
->size
= info
->size
;
3952 mddev
->raid_disks
= info
->raid_disks
;
3953 /* don't set md_minor, it is determined by which /dev/md* was
3956 if (info
->state
& (1<<MD_SB_CLEAN
))
3957 mddev
->recovery_cp
= MaxSector
;
3959 mddev
->recovery_cp
= 0;
3960 mddev
->persistent
= ! info
->not_persistent
;
3962 mddev
->layout
= info
->layout
;
3963 mddev
->chunk_size
= info
->chunk_size
;
3965 mddev
->max_disks
= MD_SB_DISKS
;
3967 mddev
->sb_dirty
= 1;
3969 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
3970 mddev
->bitmap_offset
= 0;
3972 mddev
->reshape_position
= MaxSector
;
3975 * Generate a 128 bit UUID
3977 get_random_bytes(mddev
->uuid
, 16);
3979 mddev
->new_level
= mddev
->level
;
3980 mddev
->new_chunk
= mddev
->chunk_size
;
3981 mddev
->new_layout
= mddev
->layout
;
3982 mddev
->delta_disks
= 0;
3987 static int update_size(mddev_t
*mddev
, unsigned long size
)
3991 struct list_head
*tmp
;
3992 int fit
= (size
== 0);
3994 if (mddev
->pers
->resize
== NULL
)
3996 /* The "size" is the amount of each device that is used.
3997 * This can only make sense for arrays with redundancy.
3998 * linear and raid0 always use whatever space is available
3999 * We can only consider changing the size if no resync
4000 * or reconstruction is happening, and if the new size
4001 * is acceptable. It must fit before the sb_offset or,
4002 * if that is <data_offset, it must fit before the
4003 * size of each device.
4004 * If size is zero, we find the largest size that fits.
4006 if (mddev
->sync_thread
)
4008 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4010 if (rdev
->sb_offset
> rdev
->data_offset
)
4011 avail
= (rdev
->sb_offset
*2) - rdev
->data_offset
;
4013 avail
= get_capacity(rdev
->bdev
->bd_disk
)
4014 - rdev
->data_offset
;
4015 if (fit
&& (size
== 0 || size
> avail
/2))
4017 if (avail
< ((sector_t
)size
<< 1))
4020 rv
= mddev
->pers
->resize(mddev
, (sector_t
)size
*2);
4022 struct block_device
*bdev
;
4024 bdev
= bdget_disk(mddev
->gendisk
, 0);
4026 mutex_lock(&bdev
->bd_inode
->i_mutex
);
4027 i_size_write(bdev
->bd_inode
, (loff_t
)mddev
->array_size
<< 10);
4028 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
4035 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
4038 /* change the number of raid disks */
4039 if (mddev
->pers
->check_reshape
== NULL
)
4041 if (raid_disks
<= 0 ||
4042 raid_disks
>= mddev
->max_disks
)
4044 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
4046 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
4048 rv
= mddev
->pers
->check_reshape(mddev
);
4054 * update_array_info is used to change the configuration of an
4056 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4057 * fields in the info are checked against the array.
4058 * Any differences that cannot be handled will cause an error.
4059 * Normally, only one change can be managed at a time.
4061 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
4067 /* calculate expected state,ignoring low bits */
4068 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4069 state
|= (1 << MD_SB_BITMAP_PRESENT
);
4071 if (mddev
->major_version
!= info
->major_version
||
4072 mddev
->minor_version
!= info
->minor_version
||
4073 /* mddev->patch_version != info->patch_version || */
4074 mddev
->ctime
!= info
->ctime
||
4075 mddev
->level
!= info
->level
||
4076 /* mddev->layout != info->layout || */
4077 !mddev
->persistent
!= info
->not_persistent
||
4078 mddev
->chunk_size
!= info
->chunk_size
||
4079 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4080 ((state
^info
->state
) & 0xfffffe00)
4083 /* Check there is only one change */
4084 if (info
->size
>= 0 && mddev
->size
!= info
->size
) cnt
++;
4085 if (mddev
->raid_disks
!= info
->raid_disks
) cnt
++;
4086 if (mddev
->layout
!= info
->layout
) cnt
++;
4087 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) cnt
++;
4088 if (cnt
== 0) return 0;
4089 if (cnt
> 1) return -EINVAL
;
4091 if (mddev
->layout
!= info
->layout
) {
4093 * we don't need to do anything at the md level, the
4094 * personality will take care of it all.
4096 if (mddev
->pers
->reconfig
== NULL
)
4099 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
4101 if (info
->size
>= 0 && mddev
->size
!= info
->size
)
4102 rv
= update_size(mddev
, info
->size
);
4104 if (mddev
->raid_disks
!= info
->raid_disks
)
4105 rv
= update_raid_disks(mddev
, info
->raid_disks
);
4107 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
4108 if (mddev
->pers
->quiesce
== NULL
)
4110 if (mddev
->recovery
|| mddev
->sync_thread
)
4112 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
4113 /* add the bitmap */
4116 if (mddev
->default_bitmap_offset
== 0)
4118 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
4119 mddev
->pers
->quiesce(mddev
, 1);
4120 rv
= bitmap_create(mddev
);
4122 bitmap_destroy(mddev
);
4123 mddev
->pers
->quiesce(mddev
, 0);
4125 /* remove the bitmap */
4128 if (mddev
->bitmap
->file
)
4130 mddev
->pers
->quiesce(mddev
, 1);
4131 bitmap_destroy(mddev
);
4132 mddev
->pers
->quiesce(mddev
, 0);
4133 mddev
->bitmap_offset
= 0;
4136 md_update_sb(mddev
);
4140 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
4144 if (mddev
->pers
== NULL
)
4147 rdev
= find_rdev(mddev
, dev
);
4151 md_error(mddev
, rdev
);
4155 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
4157 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
4161 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
4165 static int md_ioctl(struct inode
*inode
, struct file
*file
,
4166 unsigned int cmd
, unsigned long arg
)
4169 void __user
*argp
= (void __user
*)arg
;
4170 mddev_t
*mddev
= NULL
;
4172 if (!capable(CAP_SYS_ADMIN
))
4176 * Commands dealing with the RAID driver but not any
4182 err
= get_version(argp
);
4185 case PRINT_RAID_DEBUG
:
4193 autostart_arrays(arg
);
4200 * Commands creating/starting a new array:
4203 mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4211 if (cmd
== START_ARRAY
) {
4212 /* START_ARRAY doesn't need to lock the array as autostart_array
4213 * does the locking, and it could even be a different array
4218 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
4219 "This will not be supported beyond July 2006\n",
4220 current
->comm
, current
->pid
);
4223 err
= autostart_array(new_decode_dev(arg
));
4225 printk(KERN_WARNING
"md: autostart failed!\n");
4231 err
= mddev_lock(mddev
);
4234 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4241 case SET_ARRAY_INFO
:
4243 mdu_array_info_t info
;
4245 memset(&info
, 0, sizeof(info
));
4246 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
4251 err
= update_array_info(mddev
, &info
);
4253 printk(KERN_WARNING
"md: couldn't update"
4254 " array info. %d\n", err
);
4259 if (!list_empty(&mddev
->disks
)) {
4261 "md: array %s already has disks!\n",
4266 if (mddev
->raid_disks
) {
4268 "md: array %s already initialised!\n",
4273 err
= set_array_info(mddev
, &info
);
4275 printk(KERN_WARNING
"md: couldn't set"
4276 " array info. %d\n", err
);
4286 * Commands querying/configuring an existing array:
4288 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4289 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4290 if (!mddev
->raid_disks
&& cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
4291 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
) {
4297 * Commands even a read-only array can execute:
4301 case GET_ARRAY_INFO
:
4302 err
= get_array_info(mddev
, argp
);
4305 case GET_BITMAP_FILE
:
4306 err
= get_bitmap_file(mddev
, argp
);
4310 err
= get_disk_info(mddev
, argp
);
4313 case RESTART_ARRAY_RW
:
4314 err
= restart_array(mddev
);
4318 err
= do_md_stop (mddev
, 0);
4322 err
= do_md_stop (mddev
, 1);
4326 * We have a problem here : there is no easy way to give a CHS
4327 * virtual geometry. We currently pretend that we have a 2 heads
4328 * 4 sectors (with a BIG number of cylinders...). This drives
4329 * dosfs just mad... ;-)
4334 * The remaining ioctls are changing the state of the
4335 * superblock, so we do not allow them on read-only arrays.
4336 * However non-MD ioctls (e.g. get-size) will still come through
4337 * here and hit the 'default' below, so only disallow
4338 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4340 if (_IOC_TYPE(cmd
) == MD_MAJOR
&&
4341 mddev
->ro
&& mddev
->pers
) {
4342 if (mddev
->ro
== 2) {
4344 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4345 md_wakeup_thread(mddev
->thread
);
4357 mdu_disk_info_t info
;
4358 if (copy_from_user(&info
, argp
, sizeof(info
)))
4361 err
= add_new_disk(mddev
, &info
);
4365 case HOT_REMOVE_DISK
:
4366 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
4370 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
4373 case SET_DISK_FAULTY
:
4374 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
4378 err
= do_md_run (mddev
);
4381 case SET_BITMAP_FILE
:
4382 err
= set_bitmap_file(mddev
, (int)arg
);
4392 mddev_unlock(mddev
);
4402 static int md_open(struct inode
*inode
, struct file
*file
)
4405 * Succeed if we can lock the mddev, which confirms that
4406 * it isn't being stopped right now.
4408 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4411 if ((err
= mddev_lock(mddev
)))
4416 mddev_unlock(mddev
);
4418 check_disk_change(inode
->i_bdev
);
4423 static int md_release(struct inode
*inode
, struct file
* file
)
4425 mddev_t
*mddev
= inode
->i_bdev
->bd_disk
->private_data
;
4434 static int md_media_changed(struct gendisk
*disk
)
4436 mddev_t
*mddev
= disk
->private_data
;
4438 return mddev
->changed
;
4441 static int md_revalidate(struct gendisk
*disk
)
4443 mddev_t
*mddev
= disk
->private_data
;
4448 static struct block_device_operations md_fops
=
4450 .owner
= THIS_MODULE
,
4452 .release
= md_release
,
4454 .getgeo
= md_getgeo
,
4455 .media_changed
= md_media_changed
,
4456 .revalidate_disk
= md_revalidate
,
4459 static int md_thread(void * arg
)
4461 mdk_thread_t
*thread
= arg
;
4464 * md_thread is a 'system-thread', it's priority should be very
4465 * high. We avoid resource deadlocks individually in each
4466 * raid personality. (RAID5 does preallocation) We also use RR and
4467 * the very same RT priority as kswapd, thus we will never get
4468 * into a priority inversion deadlock.
4470 * we definitely have to have equal or higher priority than
4471 * bdflush, otherwise bdflush will deadlock if there are too
4472 * many dirty RAID5 blocks.
4475 allow_signal(SIGKILL
);
4476 while (!kthread_should_stop()) {
4478 /* We need to wait INTERRUPTIBLE so that
4479 * we don't add to the load-average.
4480 * That means we need to be sure no signals are
4483 if (signal_pending(current
))
4484 flush_signals(current
);
4486 wait_event_interruptible_timeout
4488 test_bit(THREAD_WAKEUP
, &thread
->flags
)
4489 || kthread_should_stop(),
4493 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
4495 thread
->run(thread
->mddev
);
4501 void md_wakeup_thread(mdk_thread_t
*thread
)
4504 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
4505 set_bit(THREAD_WAKEUP
, &thread
->flags
);
4506 wake_up(&thread
->wqueue
);
4510 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
4513 mdk_thread_t
*thread
;
4515 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
4519 init_waitqueue_head(&thread
->wqueue
);
4522 thread
->mddev
= mddev
;
4523 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
4524 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
4525 if (IS_ERR(thread
->tsk
)) {
4532 void md_unregister_thread(mdk_thread_t
*thread
)
4534 dprintk("interrupting MD-thread pid %d\n", thread
->tsk
->pid
);
4536 kthread_stop(thread
->tsk
);
4540 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
4547 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
4550 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4552 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4553 __builtin_return_address(0),__builtin_return_address(1),
4554 __builtin_return_address(2),__builtin_return_address(3));
4556 if (!mddev
->pers
->error_handler
)
4558 mddev
->pers
->error_handler(mddev
,rdev
);
4559 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4560 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4561 md_wakeup_thread(mddev
->thread
);
4562 md_new_event_inintr(mddev
);
4565 /* seq_file implementation /proc/mdstat */
4567 static void status_unused(struct seq_file
*seq
)
4571 struct list_head
*tmp
;
4573 seq_printf(seq
, "unused devices: ");
4575 ITERATE_RDEV_PENDING(rdev
,tmp
) {
4576 char b
[BDEVNAME_SIZE
];
4578 seq_printf(seq
, "%s ",
4579 bdevname(rdev
->bdev
,b
));
4582 seq_printf(seq
, "<none>");
4584 seq_printf(seq
, "\n");
4588 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
4590 sector_t max_blocks
, resync
, res
;
4591 unsigned long dt
, db
, rt
;
4593 unsigned int per_milli
;
4595 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
4597 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
4598 max_blocks
= mddev
->resync_max_sectors
>> 1;
4600 max_blocks
= mddev
->size
;
4603 * Should not happen.
4609 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4610 * in a sector_t, and (max_blocks>>scale) will fit in a
4611 * u32, as those are the requirements for sector_div.
4612 * Thus 'scale' must be at least 10
4615 if (sizeof(sector_t
) > sizeof(unsigned long)) {
4616 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
4619 res
= (resync
>>scale
)*1000;
4620 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
4624 int i
, x
= per_milli
/50, y
= 20-x
;
4625 seq_printf(seq
, "[");
4626 for (i
= 0; i
< x
; i
++)
4627 seq_printf(seq
, "=");
4628 seq_printf(seq
, ">");
4629 for (i
= 0; i
< y
; i
++)
4630 seq_printf(seq
, ".");
4631 seq_printf(seq
, "] ");
4633 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
4634 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
4636 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
4637 "resync" : "recovery")),
4638 per_milli
/10, per_milli
% 10,
4639 (unsigned long long) resync
,
4640 (unsigned long long) max_blocks
);
4643 * We do not want to overflow, so the order of operands and
4644 * the * 100 / 100 trick are important. We do a +1 to be
4645 * safe against division by zero. We only estimate anyway.
4647 * dt: time from mark until now
4648 * db: blocks written from mark until now
4649 * rt: remaining time
4651 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
4653 db
= resync
- (mddev
->resync_mark_cnt
/2);
4654 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/100+1)))/100;
4656 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
4658 seq_printf(seq
, " speed=%ldK/sec", db
/dt
);
4661 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4663 struct list_head
*tmp
;
4673 spin_lock(&all_mddevs_lock
);
4674 list_for_each(tmp
,&all_mddevs
)
4676 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
4678 spin_unlock(&all_mddevs_lock
);
4681 spin_unlock(&all_mddevs_lock
);
4683 return (void*)2;/* tail */
4687 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4689 struct list_head
*tmp
;
4690 mddev_t
*next_mddev
, *mddev
= v
;
4696 spin_lock(&all_mddevs_lock
);
4698 tmp
= all_mddevs
.next
;
4700 tmp
= mddev
->all_mddevs
.next
;
4701 if (tmp
!= &all_mddevs
)
4702 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
4704 next_mddev
= (void*)2;
4707 spin_unlock(&all_mddevs_lock
);
4715 static void md_seq_stop(struct seq_file
*seq
, void *v
)
4719 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
4723 struct mdstat_info
{
4727 static int md_seq_show(struct seq_file
*seq
, void *v
)
4731 struct list_head
*tmp2
;
4733 struct mdstat_info
*mi
= seq
->private;
4734 struct bitmap
*bitmap
;
4736 if (v
== (void*)1) {
4737 struct mdk_personality
*pers
;
4738 seq_printf(seq
, "Personalities : ");
4739 spin_lock(&pers_lock
);
4740 list_for_each_entry(pers
, &pers_list
, list
)
4741 seq_printf(seq
, "[%s] ", pers
->name
);
4743 spin_unlock(&pers_lock
);
4744 seq_printf(seq
, "\n");
4745 mi
->event
= atomic_read(&md_event_count
);
4748 if (v
== (void*)2) {
4753 if (mddev_lock(mddev
) < 0)
4756 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
4757 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
4758 mddev
->pers
? "" : "in");
4761 seq_printf(seq
, " (read-only)");
4763 seq_printf(seq
, "(auto-read-only)");
4764 seq_printf(seq
, " %s", mddev
->pers
->name
);
4768 ITERATE_RDEV(mddev
,rdev
,tmp2
) {
4769 char b
[BDEVNAME_SIZE
];
4770 seq_printf(seq
, " %s[%d]",
4771 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
4772 if (test_bit(WriteMostly
, &rdev
->flags
))
4773 seq_printf(seq
, "(W)");
4774 if (test_bit(Faulty
, &rdev
->flags
)) {
4775 seq_printf(seq
, "(F)");
4777 } else if (rdev
->raid_disk
< 0)
4778 seq_printf(seq
, "(S)"); /* spare */
4782 if (!list_empty(&mddev
->disks
)) {
4784 seq_printf(seq
, "\n %llu blocks",
4785 (unsigned long long)mddev
->array_size
);
4787 seq_printf(seq
, "\n %llu blocks",
4788 (unsigned long long)size
);
4790 if (mddev
->persistent
) {
4791 if (mddev
->major_version
!= 0 ||
4792 mddev
->minor_version
!= 90) {
4793 seq_printf(seq
," super %d.%d",
4794 mddev
->major_version
,
4795 mddev
->minor_version
);
4798 seq_printf(seq
, " super non-persistent");
4801 mddev
->pers
->status (seq
, mddev
);
4802 seq_printf(seq
, "\n ");
4803 if (mddev
->pers
->sync_request
) {
4804 if (mddev
->curr_resync
> 2) {
4805 status_resync (seq
, mddev
);
4806 seq_printf(seq
, "\n ");
4807 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
4808 seq_printf(seq
, "\tresync=DELAYED\n ");
4809 else if (mddev
->recovery_cp
< MaxSector
)
4810 seq_printf(seq
, "\tresync=PENDING\n ");
4813 seq_printf(seq
, "\n ");
4815 if ((bitmap
= mddev
->bitmap
)) {
4816 unsigned long chunk_kb
;
4817 unsigned long flags
;
4818 spin_lock_irqsave(&bitmap
->lock
, flags
);
4819 chunk_kb
= bitmap
->chunksize
>> 10;
4820 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
4822 bitmap
->pages
- bitmap
->missing_pages
,
4824 (bitmap
->pages
- bitmap
->missing_pages
)
4825 << (PAGE_SHIFT
- 10),
4826 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
4827 chunk_kb
? "KB" : "B");
4829 seq_printf(seq
, ", file: ");
4830 seq_path(seq
, bitmap
->file
->f_vfsmnt
,
4831 bitmap
->file
->f_dentry
," \t\n");
4834 seq_printf(seq
, "\n");
4835 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
4838 seq_printf(seq
, "\n");
4840 mddev_unlock(mddev
);
4845 static struct seq_operations md_seq_ops
= {
4846 .start
= md_seq_start
,
4847 .next
= md_seq_next
,
4848 .stop
= md_seq_stop
,
4849 .show
= md_seq_show
,
4852 static int md_seq_open(struct inode
*inode
, struct file
*file
)
4855 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
4859 error
= seq_open(file
, &md_seq_ops
);
4863 struct seq_file
*p
= file
->private_data
;
4865 mi
->event
= atomic_read(&md_event_count
);
4870 static int md_seq_release(struct inode
*inode
, struct file
*file
)
4872 struct seq_file
*m
= file
->private_data
;
4873 struct mdstat_info
*mi
= m
->private;
4876 return seq_release(inode
, file
);
4879 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
4881 struct seq_file
*m
= filp
->private_data
;
4882 struct mdstat_info
*mi
= m
->private;
4885 poll_wait(filp
, &md_event_waiters
, wait
);
4887 /* always allow read */
4888 mask
= POLLIN
| POLLRDNORM
;
4890 if (mi
->event
!= atomic_read(&md_event_count
))
4891 mask
|= POLLERR
| POLLPRI
;
4895 static struct file_operations md_seq_fops
= {
4896 .open
= md_seq_open
,
4898 .llseek
= seq_lseek
,
4899 .release
= md_seq_release
,
4900 .poll
= mdstat_poll
,
4903 int register_md_personality(struct mdk_personality
*p
)
4905 spin_lock(&pers_lock
);
4906 list_add_tail(&p
->list
, &pers_list
);
4907 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
4908 spin_unlock(&pers_lock
);
4912 int unregister_md_personality(struct mdk_personality
*p
)
4914 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
4915 spin_lock(&pers_lock
);
4916 list_del_init(&p
->list
);
4917 spin_unlock(&pers_lock
);
4921 static int is_mddev_idle(mddev_t
*mddev
)
4924 struct list_head
*tmp
;
4926 unsigned long curr_events
;
4929 ITERATE_RDEV(mddev
,rdev
,tmp
) {
4930 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
4931 curr_events
= disk_stat_read(disk
, sectors
[0]) +
4932 disk_stat_read(disk
, sectors
[1]) -
4933 atomic_read(&disk
->sync_io
);
4934 /* The difference between curr_events and last_events
4935 * will be affected by any new non-sync IO (making
4936 * curr_events bigger) and any difference in the amount of
4937 * in-flight syncio (making current_events bigger or smaller)
4938 * The amount in-flight is currently limited to
4939 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4940 * which is at most 4096 sectors.
4941 * These numbers are fairly fragile and should be made
4942 * more robust, probably by enforcing the
4943 * 'window size' that md_do_sync sort-of uses.
4945 * Note: the following is an unsigned comparison.
4947 if ((curr_events
- rdev
->last_events
+ 4096) > 8192) {
4948 rdev
->last_events
= curr_events
;
4955 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
4957 /* another "blocks" (512byte) blocks have been synced */
4958 atomic_sub(blocks
, &mddev
->recovery_active
);
4959 wake_up(&mddev
->recovery_wait
);
4961 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
4962 md_wakeup_thread(mddev
->thread
);
4963 // stop recovery, signal do_sync ....
4968 /* md_write_start(mddev, bi)
4969 * If we need to update some array metadata (e.g. 'active' flag
4970 * in superblock) before writing, schedule a superblock update
4971 * and wait for it to complete.
4973 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
4975 if (bio_data_dir(bi
) != WRITE
)
4978 BUG_ON(mddev
->ro
== 1);
4979 if (mddev
->ro
== 2) {
4980 /* need to switch to read/write */
4982 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4983 md_wakeup_thread(mddev
->thread
);
4985 atomic_inc(&mddev
->writes_pending
);
4986 if (mddev
->in_sync
) {
4987 spin_lock_irq(&mddev
->write_lock
);
4988 if (mddev
->in_sync
) {
4990 mddev
->sb_dirty
= 3;
4991 md_wakeup_thread(mddev
->thread
);
4993 spin_unlock_irq(&mddev
->write_lock
);
4995 wait_event(mddev
->sb_wait
, mddev
->sb_dirty
==0);
4998 void md_write_end(mddev_t
*mddev
)
5000 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
5001 if (mddev
->safemode
== 2)
5002 md_wakeup_thread(mddev
->thread
);
5003 else if (mddev
->safemode_delay
)
5004 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
5008 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
5010 #define SYNC_MARKS 10
5011 #define SYNC_MARK_STEP (3*HZ)
5012 void md_do_sync(mddev_t
*mddev
)
5015 unsigned int currspeed
= 0,
5017 sector_t max_sectors
,j
, io_sectors
;
5018 unsigned long mark
[SYNC_MARKS
];
5019 sector_t mark_cnt
[SYNC_MARKS
];
5021 struct list_head
*tmp
;
5022 sector_t last_check
;
5024 struct list_head
*rtmp
;
5027 /* just incase thread restarts... */
5028 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
5030 if (mddev
->ro
) /* never try to sync a read-only array */
5033 /* we overload curr_resync somewhat here.
5034 * 0 == not engaged in resync at all
5035 * 2 == checking that there is no conflict with another sync
5036 * 1 == like 2, but have yielded to allow conflicting resync to
5038 * other == active in resync - this many blocks
5040 * Before starting a resync we must have set curr_resync to
5041 * 2, and then checked that every "conflicting" array has curr_resync
5042 * less than ours. When we find one that is the same or higher
5043 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5044 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5045 * This will mean we have to start checking from the beginning again.
5050 mddev
->curr_resync
= 2;
5053 if (kthread_should_stop()) {
5054 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5057 ITERATE_MDDEV(mddev2
,tmp
) {
5058 if (mddev2
== mddev
)
5060 if (mddev2
->curr_resync
&&
5061 match_mddev_units(mddev
,mddev2
)) {
5063 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
5064 /* arbitrarily yield */
5065 mddev
->curr_resync
= 1;
5066 wake_up(&resync_wait
);
5068 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
5069 /* no need to wait here, we can wait the next
5070 * time 'round when curr_resync == 2
5073 prepare_to_wait(&resync_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
5074 if (!kthread_should_stop() &&
5075 mddev2
->curr_resync
>= mddev
->curr_resync
) {
5076 printk(KERN_INFO
"md: delaying resync of %s"
5077 " until %s has finished resync (they"
5078 " share one or more physical units)\n",
5079 mdname(mddev
), mdname(mddev2
));
5082 finish_wait(&resync_wait
, &wq
);
5085 finish_wait(&resync_wait
, &wq
);
5088 } while (mddev
->curr_resync
< 2);
5091 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5092 /* resync follows the size requested by the personality,
5093 * which defaults to physical size, but can be virtual size
5095 max_sectors
= mddev
->resync_max_sectors
;
5096 mddev
->resync_mismatches
= 0;
5097 /* we don't use the checkpoint if there's a bitmap */
5098 if (!mddev
->bitmap
&&
5099 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
5100 j
= mddev
->recovery_cp
;
5101 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
5102 max_sectors
= mddev
->size
<< 1;
5104 /* recovery follows the physical size of devices */
5105 max_sectors
= mddev
->size
<< 1;
5107 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5108 if (rdev
->raid_disk
>= 0 &&
5109 !test_bit(Faulty
, &rdev
->flags
) &&
5110 !test_bit(In_sync
, &rdev
->flags
) &&
5111 rdev
->recovery_offset
< j
)
5112 j
= rdev
->recovery_offset
;
5115 printk(KERN_INFO
"md: syncing RAID array %s\n", mdname(mddev
));
5116 printk(KERN_INFO
"md: minimum _guaranteed_ reconstruction speed:"
5117 " %d KB/sec/disc.\n", speed_min(mddev
));
5118 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
5119 "(but not more than %d KB/sec) for reconstruction.\n",
5122 is_mddev_idle(mddev
); /* this also initializes IO event counters */
5125 for (m
= 0; m
< SYNC_MARKS
; m
++) {
5127 mark_cnt
[m
] = io_sectors
;
5130 mddev
->resync_mark
= mark
[last_mark
];
5131 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
5134 * Tune reconstruction:
5136 window
= 32*(PAGE_SIZE
/512);
5137 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
5138 window
/2,(unsigned long long) max_sectors
/2);
5140 atomic_set(&mddev
->recovery_active
, 0);
5141 init_waitqueue_head(&mddev
->recovery_wait
);
5146 "md: resuming recovery of %s from checkpoint.\n",
5148 mddev
->curr_resync
= j
;
5151 while (j
< max_sectors
) {
5155 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
5156 currspeed
< speed_min(mddev
));
5158 set_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5162 if (!skipped
) { /* actual IO requested */
5163 io_sectors
+= sectors
;
5164 atomic_add(sectors
, &mddev
->recovery_active
);
5168 if (j
>1) mddev
->curr_resync
= j
;
5169 if (last_check
== 0)
5170 /* this is the earliers that rebuilt will be
5171 * visible in /proc/mdstat
5173 md_new_event(mddev
);
5175 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
5178 last_check
= io_sectors
;
5180 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) ||
5181 test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
))
5185 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
5187 int next
= (last_mark
+1) % SYNC_MARKS
;
5189 mddev
->resync_mark
= mark
[next
];
5190 mddev
->resync_mark_cnt
= mark_cnt
[next
];
5191 mark
[next
] = jiffies
;
5192 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
5197 if (kthread_should_stop()) {
5199 * got a signal, exit.
5202 "md: md_do_sync() got signal ... exiting\n");
5203 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5208 * this loop exits only if either when we are slower than
5209 * the 'hard' speed limit, or the system was IO-idle for
5211 * the system might be non-idle CPU-wise, but we only care
5212 * about not overloading the IO subsystem. (things like an
5213 * e2fsck being done on the RAID array should execute fast)
5215 mddev
->queue
->unplug_fn(mddev
->queue
);
5218 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
5219 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
5221 if (currspeed
> speed_min(mddev
)) {
5222 if ((currspeed
> speed_max(mddev
)) ||
5223 !is_mddev_idle(mddev
)) {
5229 printk(KERN_INFO
"md: %s: sync done.\n",mdname(mddev
));
5231 * this also signals 'finished resyncing' to md_stop
5234 mddev
->queue
->unplug_fn(mddev
->queue
);
5236 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
5238 /* tell personality that we are finished */
5239 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
5241 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5242 test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
5243 !test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
5244 mddev
->curr_resync
> 2) {
5245 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
5246 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5247 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
5249 "md: checkpointing recovery of %s.\n",
5251 mddev
->recovery_cp
= mddev
->curr_resync
;
5254 mddev
->recovery_cp
= MaxSector
;
5256 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
5257 mddev
->curr_resync
= MaxSector
;
5258 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5259 if (rdev
->raid_disk
>= 0 &&
5260 !test_bit(Faulty
, &rdev
->flags
) &&
5261 !test_bit(In_sync
, &rdev
->flags
) &&
5262 rdev
->recovery_offset
< mddev
->curr_resync
)
5263 rdev
->recovery_offset
= mddev
->curr_resync
;
5264 mddev
->sb_dirty
= 1;
5269 mddev
->curr_resync
= 0;
5270 wake_up(&resync_wait
);
5271 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5272 md_wakeup_thread(mddev
->thread
);
5274 EXPORT_SYMBOL_GPL(md_do_sync
);
5278 * This routine is regularly called by all per-raid-array threads to
5279 * deal with generic issues like resync and super-block update.
5280 * Raid personalities that don't have a thread (linear/raid0) do not
5281 * need this as they never do any recovery or update the superblock.
5283 * It does not do any resync itself, but rather "forks" off other threads
5284 * to do that as needed.
5285 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5286 * "->recovery" and create a thread at ->sync_thread.
5287 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5288 * and wakeups up this thread which will reap the thread and finish up.
5289 * This thread also removes any faulty devices (with nr_pending == 0).
5291 * The overall approach is:
5292 * 1/ if the superblock needs updating, update it.
5293 * 2/ If a recovery thread is running, don't do anything else.
5294 * 3/ If recovery has finished, clean up, possibly marking spares active.
5295 * 4/ If there are any faulty devices, remove them.
5296 * 5/ If array is degraded, try to add spares devices
5297 * 6/ If array has spares or is not in-sync, start a resync thread.
5299 void md_check_recovery(mddev_t
*mddev
)
5302 struct list_head
*rtmp
;
5306 bitmap_daemon_work(mddev
->bitmap
);
5311 if (signal_pending(current
)) {
5312 if (mddev
->pers
->sync_request
) {
5313 printk(KERN_INFO
"md: %s in immediate safe mode\n",
5315 mddev
->safemode
= 2;
5317 flush_signals(current
);
5322 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
5323 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
5324 (mddev
->safemode
== 1) ||
5325 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
5326 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
5330 if (mddev_trylock(mddev
)) {
5333 spin_lock_irq(&mddev
->write_lock
);
5334 if (mddev
->safemode
&& !atomic_read(&mddev
->writes_pending
) &&
5335 !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
) {
5337 mddev
->sb_dirty
= 3;
5339 if (mddev
->safemode
== 1)
5340 mddev
->safemode
= 0;
5341 spin_unlock_irq(&mddev
->write_lock
);
5343 if (mddev
->sb_dirty
)
5344 md_update_sb(mddev
);
5347 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
5348 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
5349 /* resync/recovery still happening */
5350 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5353 if (mddev
->sync_thread
) {
5354 /* resync has finished, collect result */
5355 md_unregister_thread(mddev
->sync_thread
);
5356 mddev
->sync_thread
= NULL
;
5357 if (!test_bit(MD_RECOVERY_ERR
, &mddev
->recovery
) &&
5358 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
5360 /* activate any spares */
5361 mddev
->pers
->spare_active(mddev
);
5363 md_update_sb(mddev
);
5365 /* if array is no-longer degraded, then any saved_raid_disk
5366 * information must be scrapped
5368 if (!mddev
->degraded
)
5369 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5370 rdev
->saved_raid_disk
= -1;
5372 mddev
->recovery
= 0;
5373 /* flag recovery needed just to double check */
5374 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5375 md_new_event(mddev
);
5378 /* Clear some bits that don't mean anything, but
5381 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5382 clear_bit(MD_RECOVERY_ERR
, &mddev
->recovery
);
5383 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5384 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
5386 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
5388 /* no recovery is running.
5389 * remove any failed drives, then
5390 * add spares if possible.
5391 * Spare are also removed and re-added, to allow
5392 * the personality to fail the re-add.
5394 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5395 if (rdev
->raid_disk
>= 0 &&
5396 (test_bit(Faulty
, &rdev
->flags
) || ! test_bit(In_sync
, &rdev
->flags
)) &&
5397 atomic_read(&rdev
->nr_pending
)==0) {
5398 if (mddev
->pers
->hot_remove_disk(mddev
, rdev
->raid_disk
)==0) {
5400 sprintf(nm
,"rd%d", rdev
->raid_disk
);
5401 sysfs_remove_link(&mddev
->kobj
, nm
);
5402 rdev
->raid_disk
= -1;
5406 if (mddev
->degraded
) {
5407 ITERATE_RDEV(mddev
,rdev
,rtmp
)
5408 if (rdev
->raid_disk
< 0
5409 && !test_bit(Faulty
, &rdev
->flags
)) {
5410 rdev
->recovery_offset
= 0;
5411 if (mddev
->pers
->hot_add_disk(mddev
,rdev
)) {
5413 sprintf(nm
, "rd%d", rdev
->raid_disk
);
5414 sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
);
5416 md_new_event(mddev
);
5423 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5424 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
5425 } else if (mddev
->recovery_cp
< MaxSector
) {
5426 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
5427 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5428 /* nothing to be done ... */
5431 if (mddev
->pers
->sync_request
) {
5432 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
5433 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
5434 /* We are adding a device or devices to an array
5435 * which has the bitmap stored on all devices.
5436 * So make sure all bitmap pages get written
5438 bitmap_write_all(mddev
->bitmap
);
5440 mddev
->sync_thread
= md_register_thread(md_do_sync
,
5443 if (!mddev
->sync_thread
) {
5444 printk(KERN_ERR
"%s: could not start resync"
5447 /* leave the spares where they are, it shouldn't hurt */
5448 mddev
->recovery
= 0;
5450 md_wakeup_thread(mddev
->sync_thread
);
5451 md_new_event(mddev
);
5454 mddev_unlock(mddev
);
5458 static int md_notify_reboot(struct notifier_block
*this,
5459 unsigned long code
, void *x
)
5461 struct list_head
*tmp
;
5464 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
5466 printk(KERN_INFO
"md: stopping all md devices.\n");
5468 ITERATE_MDDEV(mddev
,tmp
)
5469 if (mddev_trylock(mddev
)) {
5470 do_md_stop (mddev
, 1);
5471 mddev_unlock(mddev
);
5474 * certain more exotic SCSI devices are known to be
5475 * volatile wrt too early system reboots. While the
5476 * right place to handle this issue is the given
5477 * driver, we do want to have a safe RAID driver ...
5484 static struct notifier_block md_notifier
= {
5485 .notifier_call
= md_notify_reboot
,
5487 .priority
= INT_MAX
, /* before any real devices */
5490 static void md_geninit(void)
5492 struct proc_dir_entry
*p
;
5494 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
5496 p
= create_proc_entry("mdstat", S_IRUGO
, NULL
);
5498 p
->proc_fops
= &md_seq_fops
;
5501 static int __init
md_init(void)
5505 printk(KERN_INFO
"md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5506 " MD_SB_DISKS=%d\n",
5507 MD_MAJOR_VERSION
, MD_MINOR_VERSION
,
5508 MD_PATCHLEVEL_VERSION
, MAX_MD_DEVS
, MD_SB_DISKS
);
5509 printk(KERN_INFO
"md: bitmap version %d.%d\n", BITMAP_MAJOR_HI
,
5512 if (register_blkdev(MAJOR_NR
, "md"))
5514 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
5515 unregister_blkdev(MAJOR_NR
, "md");
5519 blk_register_region(MKDEV(MAJOR_NR
, 0), MAX_MD_DEVS
, THIS_MODULE
,
5520 md_probe
, NULL
, NULL
);
5521 blk_register_region(MKDEV(mdp_major
, 0), MAX_MD_DEVS
<<MdpMinorShift
, THIS_MODULE
,
5522 md_probe
, NULL
, NULL
);
5524 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
5525 devfs_mk_bdev(MKDEV(MAJOR_NR
, minor
),
5526 S_IFBLK
|S_IRUSR
|S_IWUSR
,
5529 for (minor
=0; minor
< MAX_MD_DEVS
; ++minor
)
5530 devfs_mk_bdev(MKDEV(mdp_major
, minor
<<MdpMinorShift
),
5531 S_IFBLK
|S_IRUSR
|S_IWUSR
,
5535 register_reboot_notifier(&md_notifier
);
5536 raid_table_header
= register_sysctl_table(raid_root_table
, 1);
5546 * Searches all registered partitions for autorun RAID arrays
5549 static dev_t detected_devices
[128];
5552 void md_autodetect_dev(dev_t dev
)
5554 if (dev_cnt
>= 0 && dev_cnt
< 127)
5555 detected_devices
[dev_cnt
++] = dev
;
5559 static void autostart_arrays(int part
)
5564 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
5566 for (i
= 0; i
< dev_cnt
; i
++) {
5567 dev_t dev
= detected_devices
[i
];
5569 rdev
= md_import_device(dev
,0, 0);
5573 if (test_bit(Faulty
, &rdev
->flags
)) {
5577 list_add(&rdev
->same_set
, &pending_raid_disks
);
5581 autorun_devices(part
);
5586 static __exit
void md_exit(void)
5589 struct list_head
*tmp
;
5591 blk_unregister_region(MKDEV(MAJOR_NR
,0), MAX_MD_DEVS
);
5592 blk_unregister_region(MKDEV(mdp_major
,0), MAX_MD_DEVS
<< MdpMinorShift
);
5593 for (i
=0; i
< MAX_MD_DEVS
; i
++)
5594 devfs_remove("md/%d", i
);
5595 for (i
=0; i
< MAX_MD_DEVS
; i
++)
5596 devfs_remove("md/d%d", i
);
5600 unregister_blkdev(MAJOR_NR
,"md");
5601 unregister_blkdev(mdp_major
, "mdp");
5602 unregister_reboot_notifier(&md_notifier
);
5603 unregister_sysctl_table(raid_table_header
);
5604 remove_proc_entry("mdstat", NULL
);
5605 ITERATE_MDDEV(mddev
,tmp
) {
5606 struct gendisk
*disk
= mddev
->gendisk
;
5609 export_array(mddev
);
5612 mddev
->gendisk
= NULL
;
5617 module_init(md_init
)
5618 module_exit(md_exit
)
5620 static int get_ro(char *buffer
, struct kernel_param
*kp
)
5622 return sprintf(buffer
, "%d", start_readonly
);
5624 static int set_ro(const char *val
, struct kernel_param
*kp
)
5627 int num
= simple_strtoul(val
, &e
, 10);
5628 if (*val
&& (*e
== '\0' || *e
== '\n')) {
5629 start_readonly
= num
;
5635 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, 0600);
5636 module_param(start_dirty_degraded
, int, 0644);
5639 EXPORT_SYMBOL(register_md_personality
);
5640 EXPORT_SYMBOL(unregister_md_personality
);
5641 EXPORT_SYMBOL(md_error
);
5642 EXPORT_SYMBOL(md_done_sync
);
5643 EXPORT_SYMBOL(md_write_start
);
5644 EXPORT_SYMBOL(md_write_end
);
5645 EXPORT_SYMBOL(md_register_thread
);
5646 EXPORT_SYMBOL(md_unregister_thread
);
5647 EXPORT_SYMBOL(md_wakeup_thread
);
5648 EXPORT_SYMBOL(md_check_recovery
);
5649 MODULE_LICENSE("GPL");
5651 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);