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/kthread.h>
36 #include <linux/blkdev.h>
37 #include <linux/sysctl.h>
38 #include <linux/seq_file.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
48 #include <linux/raid/md_p.h>
49 #include <linux/raid/md_u.h>
54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
58 static void autostart_arrays(int part
);
61 static LIST_HEAD(pers_list
);
62 static DEFINE_SPINLOCK(pers_lock
);
64 static void md_print_devices(void);
66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
71 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
72 * is 1000 KB/sec, so the extra system load does not show up that much.
73 * Increase it if you want to have more _guaranteed_ speed. Note that
74 * the RAID driver will use the maximum available bandwidth if the IO
75 * subsystem is idle. There is also an 'absolute maximum' reconstruction
76 * speed limit - in case reconstruction slows down your system despite
79 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
80 * or /sys/block/mdX/md/sync_speed_{min,max}
83 static int sysctl_speed_limit_min
= 1000;
84 static int sysctl_speed_limit_max
= 200000;
85 static inline int speed_min(mddev_t
*mddev
)
87 return mddev
->sync_speed_min
?
88 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
91 static inline int speed_max(mddev_t
*mddev
)
93 return mddev
->sync_speed_max
?
94 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
97 static struct ctl_table_header
*raid_table_header
;
99 static ctl_table raid_table
[] = {
101 .ctl_name
= DEV_RAID_SPEED_LIMIT_MIN
,
102 .procname
= "speed_limit_min",
103 .data
= &sysctl_speed_limit_min
,
104 .maxlen
= sizeof(int),
105 .mode
= S_IRUGO
|S_IWUSR
,
106 .proc_handler
= &proc_dointvec
,
109 .ctl_name
= DEV_RAID_SPEED_LIMIT_MAX
,
110 .procname
= "speed_limit_max",
111 .data
= &sysctl_speed_limit_max
,
112 .maxlen
= sizeof(int),
113 .mode
= S_IRUGO
|S_IWUSR
,
114 .proc_handler
= &proc_dointvec
,
119 static ctl_table raid_dir_table
[] = {
121 .ctl_name
= DEV_RAID
,
124 .mode
= S_IRUGO
|S_IXUGO
,
130 static ctl_table raid_root_table
[] = {
136 .child
= raid_dir_table
,
141 static struct block_device_operations md_fops
;
143 static int start_readonly
;
146 * We have a system wide 'event count' that is incremented
147 * on any 'interesting' event, and readers of /proc/mdstat
148 * can use 'poll' or 'select' to find out when the event
152 * start array, stop array, error, add device, remove device,
153 * start build, activate spare
155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
156 static atomic_t md_event_count
;
157 void md_new_event(mddev_t
*mddev
)
159 atomic_inc(&md_event_count
);
160 wake_up(&md_event_waiters
);
162 EXPORT_SYMBOL_GPL(md_new_event
);
164 /* Alternate version that can be called from interrupts
165 * when calling sysfs_notify isn't needed.
167 static void md_new_event_inintr(mddev_t
*mddev
)
169 atomic_inc(&md_event_count
);
170 wake_up(&md_event_waiters
);
174 * Enables to iterate over all existing md arrays
175 * all_mddevs_lock protects this list.
177 static LIST_HEAD(all_mddevs
);
178 static DEFINE_SPINLOCK(all_mddevs_lock
);
182 * iterates through all used mddevs in the system.
183 * We take care to grab the all_mddevs_lock whenever navigating
184 * the list, and to always hold a refcount when unlocked.
185 * Any code which breaks out of this loop while own
186 * a reference to the current mddev and must mddev_put it.
188 #define for_each_mddev(mddev,tmp) \
190 for (({ spin_lock(&all_mddevs_lock); \
191 tmp = all_mddevs.next; \
193 ({ if (tmp != &all_mddevs) \
194 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
195 spin_unlock(&all_mddevs_lock); \
196 if (mddev) mddev_put(mddev); \
197 mddev = list_entry(tmp, mddev_t, all_mddevs); \
198 tmp != &all_mddevs;}); \
199 ({ spin_lock(&all_mddevs_lock); \
204 /* Rather than calling directly into the personality make_request function,
205 * IO requests come here first so that we can check if the device is
206 * being suspended pending a reconfiguration.
207 * We hold a refcount over the call to ->make_request. By the time that
208 * call has finished, the bio has been linked into some internal structure
209 * and so is visible to ->quiesce(), so we don't need the refcount any more.
211 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
213 mddev_t
*mddev
= q
->queuedata
;
215 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
220 if (mddev
->suspended
) {
223 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
224 TASK_UNINTERRUPTIBLE
);
225 if (!mddev
->suspended
)
231 finish_wait(&mddev
->sb_wait
, &__wait
);
233 atomic_inc(&mddev
->active_io
);
235 rv
= mddev
->pers
->make_request(q
, bio
);
236 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
237 wake_up(&mddev
->sb_wait
);
242 static void mddev_suspend(mddev_t
*mddev
)
244 BUG_ON(mddev
->suspended
);
245 mddev
->suspended
= 1;
247 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
248 mddev
->pers
->quiesce(mddev
, 1);
249 md_unregister_thread(mddev
->thread
);
250 mddev
->thread
= NULL
;
251 /* we now know that no code is executing in the personality module,
252 * except possibly the tail end of a ->bi_end_io function, but that
253 * is certain to complete before the module has a chance to get
258 static void mddev_resume(mddev_t
*mddev
)
260 mddev
->suspended
= 0;
261 wake_up(&mddev
->sb_wait
);
262 mddev
->pers
->quiesce(mddev
, 0);
266 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
268 atomic_inc(&mddev
->active
);
272 static void mddev_delayed_delete(struct work_struct
*ws
);
274 static void mddev_put(mddev_t
*mddev
)
276 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
278 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
279 mddev
->ctime
== 0 && !mddev
->hold_active
) {
280 /* Array is not configured at all, and not held active,
282 list_del(&mddev
->all_mddevs
);
283 if (mddev
->gendisk
) {
284 /* we did a probe so need to clean up.
285 * Call schedule_work inside the spinlock
286 * so that flush_scheduled_work() after
287 * mddev_find will succeed in waiting for the
290 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
291 schedule_work(&mddev
->del_work
);
295 spin_unlock(&all_mddevs_lock
);
298 static mddev_t
* mddev_find(dev_t unit
)
300 mddev_t
*mddev
, *new = NULL
;
303 spin_lock(&all_mddevs_lock
);
306 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
307 if (mddev
->unit
== unit
) {
309 spin_unlock(&all_mddevs_lock
);
315 list_add(&new->all_mddevs
, &all_mddevs
);
316 spin_unlock(&all_mddevs_lock
);
317 new->hold_active
= UNTIL_IOCTL
;
321 /* find an unused unit number */
322 static int next_minor
= 512;
323 int start
= next_minor
;
327 dev
= MKDEV(MD_MAJOR
, next_minor
);
329 if (next_minor
> MINORMASK
)
331 if (next_minor
== start
) {
332 /* Oh dear, all in use. */
333 spin_unlock(&all_mddevs_lock
);
339 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
340 if (mddev
->unit
== dev
) {
346 new->md_minor
= MINOR(dev
);
347 new->hold_active
= UNTIL_STOP
;
348 list_add(&new->all_mddevs
, &all_mddevs
);
349 spin_unlock(&all_mddevs_lock
);
352 spin_unlock(&all_mddevs_lock
);
354 new = kzalloc(sizeof(*new), GFP_KERNEL
);
359 if (MAJOR(unit
) == MD_MAJOR
)
360 new->md_minor
= MINOR(unit
);
362 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
364 mutex_init(&new->open_mutex
);
365 mutex_init(&new->reconfig_mutex
);
366 mutex_init(&new->bitmap_mutex
);
367 INIT_LIST_HEAD(&new->disks
);
368 INIT_LIST_HEAD(&new->all_mddevs
);
369 init_timer(&new->safemode_timer
);
370 atomic_set(&new->active
, 1);
371 atomic_set(&new->openers
, 0);
372 atomic_set(&new->active_io
, 0);
373 spin_lock_init(&new->write_lock
);
374 init_waitqueue_head(&new->sb_wait
);
375 init_waitqueue_head(&new->recovery_wait
);
376 new->reshape_position
= MaxSector
;
378 new->resync_max
= MaxSector
;
379 new->level
= LEVEL_NONE
;
384 static inline int mddev_lock(mddev_t
* mddev
)
386 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
389 static inline int mddev_is_locked(mddev_t
*mddev
)
391 return mutex_is_locked(&mddev
->reconfig_mutex
);
394 static inline int mddev_trylock(mddev_t
* mddev
)
396 return mutex_trylock(&mddev
->reconfig_mutex
);
399 static inline void mddev_unlock(mddev_t
* mddev
)
401 mutex_unlock(&mddev
->reconfig_mutex
);
403 md_wakeup_thread(mddev
->thread
);
406 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
410 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
411 if (rdev
->desc_nr
== nr
)
417 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
421 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
422 if (rdev
->bdev
->bd_dev
== dev
)
428 static struct mdk_personality
*find_pers(int level
, char *clevel
)
430 struct mdk_personality
*pers
;
431 list_for_each_entry(pers
, &pers_list
, list
) {
432 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
434 if (strcmp(pers
->name
, clevel
)==0)
440 /* return the offset of the super block in 512byte sectors */
441 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
443 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
444 return MD_NEW_SIZE_SECTORS(num_sectors
);
447 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
452 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
453 if (!rdev
->sb_page
) {
454 printk(KERN_ALERT
"md: out of memory.\n");
461 static void free_disk_sb(mdk_rdev_t
* rdev
)
464 put_page(rdev
->sb_page
);
466 rdev
->sb_page
= NULL
;
473 static void super_written(struct bio
*bio
, int error
)
475 mdk_rdev_t
*rdev
= bio
->bi_private
;
476 mddev_t
*mddev
= rdev
->mddev
;
478 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
479 printk("md: super_written gets error=%d, uptodate=%d\n",
480 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
481 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
482 md_error(mddev
, rdev
);
485 if (atomic_dec_and_test(&mddev
->pending_writes
))
486 wake_up(&mddev
->sb_wait
);
490 static void super_written_barrier(struct bio
*bio
, int error
)
492 struct bio
*bio2
= bio
->bi_private
;
493 mdk_rdev_t
*rdev
= bio2
->bi_private
;
494 mddev_t
*mddev
= rdev
->mddev
;
496 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
497 error
== -EOPNOTSUPP
) {
499 /* barriers don't appear to be supported :-( */
500 set_bit(BarriersNotsupp
, &rdev
->flags
);
501 mddev
->barriers_work
= 0;
502 spin_lock_irqsave(&mddev
->write_lock
, flags
);
503 bio2
->bi_next
= mddev
->biolist
;
504 mddev
->biolist
= bio2
;
505 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
506 wake_up(&mddev
->sb_wait
);
510 bio
->bi_private
= rdev
;
511 super_written(bio
, error
);
515 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
516 sector_t sector
, int size
, struct page
*page
)
518 /* write first size bytes of page to sector of rdev
519 * Increment mddev->pending_writes before returning
520 * and decrement it on completion, waking up sb_wait
521 * if zero is reached.
522 * If an error occurred, call md_error
524 * As we might need to resubmit the request if BIO_RW_BARRIER
525 * causes ENOTSUPP, we allocate a spare bio...
527 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
528 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNCIO
) | (1<<BIO_RW_UNPLUG
);
530 bio
->bi_bdev
= rdev
->bdev
;
531 bio
->bi_sector
= sector
;
532 bio_add_page(bio
, page
, size
, 0);
533 bio
->bi_private
= rdev
;
534 bio
->bi_end_io
= super_written
;
537 atomic_inc(&mddev
->pending_writes
);
538 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
540 rw
|= (1<<BIO_RW_BARRIER
);
541 rbio
= bio_clone(bio
, GFP_NOIO
);
542 rbio
->bi_private
= bio
;
543 rbio
->bi_end_io
= super_written_barrier
;
544 submit_bio(rw
, rbio
);
549 void md_super_wait(mddev_t
*mddev
)
551 /* wait for all superblock writes that were scheduled to complete.
552 * if any had to be retried (due to BARRIER problems), retry them
556 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
557 if (atomic_read(&mddev
->pending_writes
)==0)
559 while (mddev
->biolist
) {
561 spin_lock_irq(&mddev
->write_lock
);
562 bio
= mddev
->biolist
;
563 mddev
->biolist
= bio
->bi_next
;
565 spin_unlock_irq(&mddev
->write_lock
);
566 submit_bio(bio
->bi_rw
, bio
);
570 finish_wait(&mddev
->sb_wait
, &wq
);
573 static void bi_complete(struct bio
*bio
, int error
)
575 complete((struct completion
*)bio
->bi_private
);
578 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
579 struct page
*page
, int rw
)
581 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
582 struct completion event
;
585 rw
|= (1 << BIO_RW_SYNCIO
) | (1 << BIO_RW_UNPLUG
);
588 bio
->bi_sector
= sector
;
589 bio_add_page(bio
, page
, size
, 0);
590 init_completion(&event
);
591 bio
->bi_private
= &event
;
592 bio
->bi_end_io
= bi_complete
;
594 wait_for_completion(&event
);
596 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
600 EXPORT_SYMBOL_GPL(sync_page_io
);
602 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
604 char b
[BDEVNAME_SIZE
];
605 if (!rdev
->sb_page
) {
613 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
619 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
620 bdevname(rdev
->bdev
,b
));
624 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
626 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
627 sb1
->set_uuid1
== sb2
->set_uuid1
&&
628 sb1
->set_uuid2
== sb2
->set_uuid2
&&
629 sb1
->set_uuid3
== sb2
->set_uuid3
;
632 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
635 mdp_super_t
*tmp1
, *tmp2
;
637 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
638 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
640 if (!tmp1
|| !tmp2
) {
642 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
650 * nr_disks is not constant
655 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
663 static u32
md_csum_fold(u32 csum
)
665 csum
= (csum
& 0xffff) + (csum
>> 16);
666 return (csum
& 0xffff) + (csum
>> 16);
669 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
672 u32
*sb32
= (u32
*)sb
;
674 unsigned int disk_csum
, csum
;
676 disk_csum
= sb
->sb_csum
;
679 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
681 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
685 /* This used to use csum_partial, which was wrong for several
686 * reasons including that different results are returned on
687 * different architectures. It isn't critical that we get exactly
688 * the same return value as before (we always csum_fold before
689 * testing, and that removes any differences). However as we
690 * know that csum_partial always returned a 16bit value on
691 * alphas, do a fold to maximise conformity to previous behaviour.
693 sb
->sb_csum
= md_csum_fold(disk_csum
);
695 sb
->sb_csum
= disk_csum
;
702 * Handle superblock details.
703 * We want to be able to handle multiple superblock formats
704 * so we have a common interface to them all, and an array of
705 * different handlers.
706 * We rely on user-space to write the initial superblock, and support
707 * reading and updating of superblocks.
708 * Interface methods are:
709 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
710 * loads and validates a superblock on dev.
711 * if refdev != NULL, compare superblocks on both devices
713 * 0 - dev has a superblock that is compatible with refdev
714 * 1 - dev has a superblock that is compatible and newer than refdev
715 * so dev should be used as the refdev in future
716 * -EINVAL superblock incompatible or invalid
717 * -othererror e.g. -EIO
719 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
720 * Verify that dev is acceptable into mddev.
721 * The first time, mddev->raid_disks will be 0, and data from
722 * dev should be merged in. Subsequent calls check that dev
723 * is new enough. Return 0 or -EINVAL
725 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
726 * Update the superblock for rdev with data in mddev
727 * This does not write to disc.
733 struct module
*owner
;
734 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
736 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
737 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
738 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
739 sector_t num_sectors
);
743 * Check that the given mddev has no bitmap.
745 * This function is called from the run method of all personalities that do not
746 * support bitmaps. It prints an error message and returns non-zero if mddev
747 * has a bitmap. Otherwise, it returns 0.
750 int md_check_no_bitmap(mddev_t
*mddev
)
752 if (!mddev
->bitmap_file
&& !mddev
->bitmap_offset
)
754 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
755 mdname(mddev
), mddev
->pers
->name
);
758 EXPORT_SYMBOL(md_check_no_bitmap
);
761 * load_super for 0.90.0
763 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
765 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
770 * Calculate the position of the superblock (512byte sectors),
771 * it's at the end of the disk.
773 * It also happens to be a multiple of 4Kb.
775 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
777 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
782 bdevname(rdev
->bdev
, b
);
783 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
785 if (sb
->md_magic
!= MD_SB_MAGIC
) {
786 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
791 if (sb
->major_version
!= 0 ||
792 sb
->minor_version
< 90 ||
793 sb
->minor_version
> 91) {
794 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
795 sb
->major_version
, sb
->minor_version
,
800 if (sb
->raid_disks
<= 0)
803 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
804 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
809 rdev
->preferred_minor
= sb
->md_minor
;
810 rdev
->data_offset
= 0;
811 rdev
->sb_size
= MD_SB_BYTES
;
813 if (sb
->level
== LEVEL_MULTIPATH
)
816 rdev
->desc_nr
= sb
->this_disk
.number
;
822 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
823 if (!uuid_equal(refsb
, sb
)) {
824 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
825 b
, bdevname(refdev
->bdev
,b2
));
828 if (!sb_equal(refsb
, sb
)) {
829 printk(KERN_WARNING
"md: %s has same UUID"
830 " but different superblock to %s\n",
831 b
, bdevname(refdev
->bdev
, b2
));
835 ev2
= md_event(refsb
);
841 rdev
->sectors
= rdev
->sb_start
;
843 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
844 /* "this cannot possibly happen" ... */
852 * validate_super for 0.90.0
854 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
857 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
858 __u64 ev1
= md_event(sb
);
860 rdev
->raid_disk
= -1;
861 clear_bit(Faulty
, &rdev
->flags
);
862 clear_bit(In_sync
, &rdev
->flags
);
863 clear_bit(WriteMostly
, &rdev
->flags
);
864 clear_bit(BarriersNotsupp
, &rdev
->flags
);
866 if (mddev
->raid_disks
== 0) {
867 mddev
->major_version
= 0;
868 mddev
->minor_version
= sb
->minor_version
;
869 mddev
->patch_version
= sb
->patch_version
;
871 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
872 mddev
->ctime
= sb
->ctime
;
873 mddev
->utime
= sb
->utime
;
874 mddev
->level
= sb
->level
;
875 mddev
->clevel
[0] = 0;
876 mddev
->layout
= sb
->layout
;
877 mddev
->raid_disks
= sb
->raid_disks
;
878 mddev
->dev_sectors
= sb
->size
* 2;
880 mddev
->bitmap_offset
= 0;
881 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
883 if (mddev
->minor_version
>= 91) {
884 mddev
->reshape_position
= sb
->reshape_position
;
885 mddev
->delta_disks
= sb
->delta_disks
;
886 mddev
->new_level
= sb
->new_level
;
887 mddev
->new_layout
= sb
->new_layout
;
888 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
890 mddev
->reshape_position
= MaxSector
;
891 mddev
->delta_disks
= 0;
892 mddev
->new_level
= mddev
->level
;
893 mddev
->new_layout
= mddev
->layout
;
894 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
897 if (sb
->state
& (1<<MD_SB_CLEAN
))
898 mddev
->recovery_cp
= MaxSector
;
900 if (sb
->events_hi
== sb
->cp_events_hi
&&
901 sb
->events_lo
== sb
->cp_events_lo
) {
902 mddev
->recovery_cp
= sb
->recovery_cp
;
904 mddev
->recovery_cp
= 0;
907 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
908 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
909 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
910 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
912 mddev
->max_disks
= MD_SB_DISKS
;
914 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
915 mddev
->bitmap_file
== NULL
)
916 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
918 } else if (mddev
->pers
== NULL
) {
919 /* Insist on good event counter while assembling */
921 if (ev1
< mddev
->events
)
923 } else if (mddev
->bitmap
) {
924 /* if adding to array with a bitmap, then we can accept an
925 * older device ... but not too old.
927 if (ev1
< mddev
->bitmap
->events_cleared
)
930 if (ev1
< mddev
->events
)
931 /* just a hot-add of a new device, leave raid_disk at -1 */
935 if (mddev
->level
!= LEVEL_MULTIPATH
) {
936 desc
= sb
->disks
+ rdev
->desc_nr
;
938 if (desc
->state
& (1<<MD_DISK_FAULTY
))
939 set_bit(Faulty
, &rdev
->flags
);
940 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
941 desc->raid_disk < mddev->raid_disks */) {
942 set_bit(In_sync
, &rdev
->flags
);
943 rdev
->raid_disk
= desc
->raid_disk
;
945 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
946 set_bit(WriteMostly
, &rdev
->flags
);
947 } else /* MULTIPATH are always insync */
948 set_bit(In_sync
, &rdev
->flags
);
953 * sync_super for 0.90.0
955 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
959 int next_spare
= mddev
->raid_disks
;
962 /* make rdev->sb match mddev data..
965 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
966 * 3/ any empty disks < next_spare become removed
968 * disks[0] gets initialised to REMOVED because
969 * we cannot be sure from other fields if it has
970 * been initialised or not.
973 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
975 rdev
->sb_size
= MD_SB_BYTES
;
977 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
979 memset(sb
, 0, sizeof(*sb
));
981 sb
->md_magic
= MD_SB_MAGIC
;
982 sb
->major_version
= mddev
->major_version
;
983 sb
->patch_version
= mddev
->patch_version
;
984 sb
->gvalid_words
= 0; /* ignored */
985 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
986 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
987 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
988 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
990 sb
->ctime
= mddev
->ctime
;
991 sb
->level
= mddev
->level
;
992 sb
->size
= mddev
->dev_sectors
/ 2;
993 sb
->raid_disks
= mddev
->raid_disks
;
994 sb
->md_minor
= mddev
->md_minor
;
995 sb
->not_persistent
= 0;
996 sb
->utime
= mddev
->utime
;
998 sb
->events_hi
= (mddev
->events
>>32);
999 sb
->events_lo
= (u32
)mddev
->events
;
1001 if (mddev
->reshape_position
== MaxSector
)
1002 sb
->minor_version
= 90;
1004 sb
->minor_version
= 91;
1005 sb
->reshape_position
= mddev
->reshape_position
;
1006 sb
->new_level
= mddev
->new_level
;
1007 sb
->delta_disks
= mddev
->delta_disks
;
1008 sb
->new_layout
= mddev
->new_layout
;
1009 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1011 mddev
->minor_version
= sb
->minor_version
;
1014 sb
->recovery_cp
= mddev
->recovery_cp
;
1015 sb
->cp_events_hi
= (mddev
->events
>>32);
1016 sb
->cp_events_lo
= (u32
)mddev
->events
;
1017 if (mddev
->recovery_cp
== MaxSector
)
1018 sb
->state
= (1<< MD_SB_CLEAN
);
1020 sb
->recovery_cp
= 0;
1022 sb
->layout
= mddev
->layout
;
1023 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1025 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
1026 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1028 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1029 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1032 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
1033 && !test_bit(Faulty
, &rdev2
->flags
))
1034 desc_nr
= rdev2
->raid_disk
;
1036 desc_nr
= next_spare
++;
1037 rdev2
->desc_nr
= desc_nr
;
1038 d
= &sb
->disks
[rdev2
->desc_nr
];
1040 d
->number
= rdev2
->desc_nr
;
1041 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1042 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1043 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
1044 && !test_bit(Faulty
, &rdev2
->flags
))
1045 d
->raid_disk
= rdev2
->raid_disk
;
1047 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1048 if (test_bit(Faulty
, &rdev2
->flags
))
1049 d
->state
= (1<<MD_DISK_FAULTY
);
1050 else if (test_bit(In_sync
, &rdev2
->flags
)) {
1051 d
->state
= (1<<MD_DISK_ACTIVE
);
1052 d
->state
|= (1<<MD_DISK_SYNC
);
1060 if (test_bit(WriteMostly
, &rdev2
->flags
))
1061 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1063 /* now set the "removed" and "faulty" bits on any missing devices */
1064 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1065 mdp_disk_t
*d
= &sb
->disks
[i
];
1066 if (d
->state
== 0 && d
->number
== 0) {
1069 d
->state
= (1<<MD_DISK_REMOVED
);
1070 d
->state
|= (1<<MD_DISK_FAULTY
);
1074 sb
->nr_disks
= nr_disks
;
1075 sb
->active_disks
= active
;
1076 sb
->working_disks
= working
;
1077 sb
->failed_disks
= failed
;
1078 sb
->spare_disks
= spare
;
1080 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1081 sb
->sb_csum
= calc_sb_csum(sb
);
1085 * rdev_size_change for 0.90.0
1087 static unsigned long long
1088 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1090 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1091 return 0; /* component must fit device */
1092 if (rdev
->mddev
->bitmap_offset
)
1093 return 0; /* can't move bitmap */
1094 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1095 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1096 num_sectors
= rdev
->sb_start
;
1097 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1099 md_super_wait(rdev
->mddev
);
1100 return num_sectors
/ 2; /* kB for sysfs */
1105 * version 1 superblock
1108 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1112 unsigned long long newcsum
;
1113 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1114 __le32
*isuper
= (__le32
*)sb
;
1117 disk_csum
= sb
->sb_csum
;
1120 for (i
=0; size
>=4; size
-= 4 )
1121 newcsum
+= le32_to_cpu(*isuper
++);
1124 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1126 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1127 sb
->sb_csum
= disk_csum
;
1128 return cpu_to_le32(csum
);
1131 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1133 struct mdp_superblock_1
*sb
;
1136 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1140 * Calculate the position of the superblock in 512byte sectors.
1141 * It is always aligned to a 4K boundary and
1142 * depeding on minor_version, it can be:
1143 * 0: At least 8K, but less than 12K, from end of device
1144 * 1: At start of device
1145 * 2: 4K from start of device.
1147 switch(minor_version
) {
1149 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1151 sb_start
&= ~(sector_t
)(4*2-1);
1162 rdev
->sb_start
= sb_start
;
1164 /* superblock is rarely larger than 1K, but it can be larger,
1165 * and it is safe to read 4k, so we do that
1167 ret
= read_disk_sb(rdev
, 4096);
1168 if (ret
) return ret
;
1171 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1173 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1174 sb
->major_version
!= cpu_to_le32(1) ||
1175 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1176 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1177 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1180 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1181 printk("md: invalid superblock checksum on %s\n",
1182 bdevname(rdev
->bdev
,b
));
1185 if (le64_to_cpu(sb
->data_size
) < 10) {
1186 printk("md: data_size too small on %s\n",
1187 bdevname(rdev
->bdev
,b
));
1191 rdev
->preferred_minor
= 0xffff;
1192 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1193 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1195 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1196 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1197 if (rdev
->sb_size
& bmask
)
1198 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1201 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1204 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1207 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1213 struct mdp_superblock_1
*refsb
=
1214 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1216 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1217 sb
->level
!= refsb
->level
||
1218 sb
->layout
!= refsb
->layout
||
1219 sb
->chunksize
!= refsb
->chunksize
) {
1220 printk(KERN_WARNING
"md: %s has strangely different"
1221 " superblock to %s\n",
1222 bdevname(rdev
->bdev
,b
),
1223 bdevname(refdev
->bdev
,b2
));
1226 ev1
= le64_to_cpu(sb
->events
);
1227 ev2
= le64_to_cpu(refsb
->events
);
1235 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1236 le64_to_cpu(sb
->data_offset
);
1238 rdev
->sectors
= rdev
->sb_start
;
1239 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1241 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1242 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1247 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1249 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1250 __u64 ev1
= le64_to_cpu(sb
->events
);
1252 rdev
->raid_disk
= -1;
1253 clear_bit(Faulty
, &rdev
->flags
);
1254 clear_bit(In_sync
, &rdev
->flags
);
1255 clear_bit(WriteMostly
, &rdev
->flags
);
1256 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1258 if (mddev
->raid_disks
== 0) {
1259 mddev
->major_version
= 1;
1260 mddev
->patch_version
= 0;
1261 mddev
->external
= 0;
1262 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1263 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1264 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1265 mddev
->level
= le32_to_cpu(sb
->level
);
1266 mddev
->clevel
[0] = 0;
1267 mddev
->layout
= le32_to_cpu(sb
->layout
);
1268 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1269 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1270 mddev
->events
= ev1
;
1271 mddev
->bitmap_offset
= 0;
1272 mddev
->default_bitmap_offset
= 1024 >> 9;
1274 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1275 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1277 mddev
->max_disks
= (4096-256)/2;
1279 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1280 mddev
->bitmap_file
== NULL
)
1281 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1283 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1284 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1285 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1286 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1287 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1288 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1290 mddev
->reshape_position
= MaxSector
;
1291 mddev
->delta_disks
= 0;
1292 mddev
->new_level
= mddev
->level
;
1293 mddev
->new_layout
= mddev
->layout
;
1294 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1297 } else if (mddev
->pers
== NULL
) {
1298 /* Insist of good event counter while assembling */
1300 if (ev1
< mddev
->events
)
1302 } else if (mddev
->bitmap
) {
1303 /* If adding to array with a bitmap, then we can accept an
1304 * older device, but not too old.
1306 if (ev1
< mddev
->bitmap
->events_cleared
)
1309 if (ev1
< mddev
->events
)
1310 /* just a hot-add of a new device, leave raid_disk at -1 */
1313 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1315 if (rdev
->desc_nr
< 0 ||
1316 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1320 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1322 case 0xffff: /* spare */
1324 case 0xfffe: /* faulty */
1325 set_bit(Faulty
, &rdev
->flags
);
1328 if ((le32_to_cpu(sb
->feature_map
) &
1329 MD_FEATURE_RECOVERY_OFFSET
))
1330 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1332 set_bit(In_sync
, &rdev
->flags
);
1333 rdev
->raid_disk
= role
;
1336 if (sb
->devflags
& WriteMostly1
)
1337 set_bit(WriteMostly
, &rdev
->flags
);
1338 } else /* MULTIPATH are always insync */
1339 set_bit(In_sync
, &rdev
->flags
);
1344 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1346 struct mdp_superblock_1
*sb
;
1349 /* make rdev->sb match mddev and rdev data. */
1351 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1353 sb
->feature_map
= 0;
1355 sb
->recovery_offset
= cpu_to_le64(0);
1356 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1357 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1358 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1360 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1361 sb
->events
= cpu_to_le64(mddev
->events
);
1363 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1365 sb
->resync_offset
= cpu_to_le64(0);
1367 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1369 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1370 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1371 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1372 sb
->level
= cpu_to_le32(mddev
->level
);
1373 sb
->layout
= cpu_to_le32(mddev
->layout
);
1375 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1376 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1377 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1380 if (rdev
->raid_disk
>= 0 &&
1381 !test_bit(In_sync
, &rdev
->flags
)) {
1382 if (mddev
->curr_resync_completed
> rdev
->recovery_offset
)
1383 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
1384 if (rdev
->recovery_offset
> 0) {
1386 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1387 sb
->recovery_offset
=
1388 cpu_to_le64(rdev
->recovery_offset
);
1392 if (mddev
->reshape_position
!= MaxSector
) {
1393 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1394 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1395 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1396 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1397 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1398 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1402 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1403 if (rdev2
->desc_nr
+1 > max_dev
)
1404 max_dev
= rdev2
->desc_nr
+1;
1406 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1408 sb
->max_dev
= cpu_to_le32(max_dev
);
1409 rdev
->sb_size
= max_dev
* 2 + 256;
1410 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1411 if (rdev
->sb_size
& bmask
)
1412 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1414 for (i
=0; i
<max_dev
;i
++)
1415 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1417 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1419 if (test_bit(Faulty
, &rdev2
->flags
))
1420 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1421 else if (test_bit(In_sync
, &rdev2
->flags
))
1422 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1423 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1424 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1426 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1429 sb
->sb_csum
= calc_sb_1_csum(sb
);
1432 static unsigned long long
1433 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1435 struct mdp_superblock_1
*sb
;
1436 sector_t max_sectors
;
1437 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1438 return 0; /* component must fit device */
1439 if (rdev
->sb_start
< rdev
->data_offset
) {
1440 /* minor versions 1 and 2; superblock before data */
1441 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1442 max_sectors
-= rdev
->data_offset
;
1443 if (!num_sectors
|| num_sectors
> max_sectors
)
1444 num_sectors
= max_sectors
;
1445 } else if (rdev
->mddev
->bitmap_offset
) {
1446 /* minor version 0 with bitmap we can't move */
1449 /* minor version 0; superblock after data */
1451 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1452 sb_start
&= ~(sector_t
)(4*2 - 1);
1453 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1454 if (!num_sectors
|| num_sectors
> max_sectors
)
1455 num_sectors
= max_sectors
;
1456 rdev
->sb_start
= sb_start
;
1458 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1459 sb
->data_size
= cpu_to_le64(num_sectors
);
1460 sb
->super_offset
= rdev
->sb_start
;
1461 sb
->sb_csum
= calc_sb_1_csum(sb
);
1462 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1464 md_super_wait(rdev
->mddev
);
1465 return num_sectors
/ 2; /* kB for sysfs */
1468 static struct super_type super_types
[] = {
1471 .owner
= THIS_MODULE
,
1472 .load_super
= super_90_load
,
1473 .validate_super
= super_90_validate
,
1474 .sync_super
= super_90_sync
,
1475 .rdev_size_change
= super_90_rdev_size_change
,
1479 .owner
= THIS_MODULE
,
1480 .load_super
= super_1_load
,
1481 .validate_super
= super_1_validate
,
1482 .sync_super
= super_1_sync
,
1483 .rdev_size_change
= super_1_rdev_size_change
,
1487 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1489 mdk_rdev_t
*rdev
, *rdev2
;
1492 rdev_for_each_rcu(rdev
, mddev1
)
1493 rdev_for_each_rcu(rdev2
, mddev2
)
1494 if (rdev
->bdev
->bd_contains
==
1495 rdev2
->bdev
->bd_contains
) {
1503 static LIST_HEAD(pending_raid_disks
);
1506 * Try to register data integrity profile for an mddev
1508 * This is called when an array is started and after a disk has been kicked
1509 * from the array. It only succeeds if all working and active component devices
1510 * are integrity capable with matching profiles.
1512 int md_integrity_register(mddev_t
*mddev
)
1514 mdk_rdev_t
*rdev
, *reference
= NULL
;
1516 if (list_empty(&mddev
->disks
))
1517 return 0; /* nothing to do */
1518 if (blk_get_integrity(mddev
->gendisk
))
1519 return 0; /* already registered */
1520 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1521 /* skip spares and non-functional disks */
1522 if (test_bit(Faulty
, &rdev
->flags
))
1524 if (rdev
->raid_disk
< 0)
1527 * If at least one rdev is not integrity capable, we can not
1528 * enable data integrity for the md device.
1530 if (!bdev_get_integrity(rdev
->bdev
))
1533 /* Use the first rdev as the reference */
1537 /* does this rdev's profile match the reference profile? */
1538 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1539 rdev
->bdev
->bd_disk
) < 0)
1543 * All component devices are integrity capable and have matching
1544 * profiles, register the common profile for the md device.
1546 if (blk_integrity_register(mddev
->gendisk
,
1547 bdev_get_integrity(reference
->bdev
)) != 0) {
1548 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1552 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1556 EXPORT_SYMBOL(md_integrity_register
);
1558 /* Disable data integrity if non-capable/non-matching disk is being added */
1559 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1561 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1562 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1564 if (!bi_mddev
) /* nothing to do */
1566 if (rdev
->raid_disk
< 0) /* skip spares */
1568 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1569 rdev
->bdev
->bd_disk
) >= 0)
1571 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1572 blk_integrity_unregister(mddev
->gendisk
);
1574 EXPORT_SYMBOL(md_integrity_add_rdev
);
1576 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1578 char b
[BDEVNAME_SIZE
];
1588 /* prevent duplicates */
1589 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1592 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1593 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1594 rdev
->sectors
< mddev
->dev_sectors
)) {
1596 /* Cannot change size, so fail
1597 * If mddev->level <= 0, then we don't care
1598 * about aligning sizes (e.g. linear)
1600 if (mddev
->level
> 0)
1603 mddev
->dev_sectors
= rdev
->sectors
;
1606 /* Verify rdev->desc_nr is unique.
1607 * If it is -1, assign a free number, else
1608 * check number is not in use
1610 if (rdev
->desc_nr
< 0) {
1612 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1613 while (find_rdev_nr(mddev
, choice
))
1615 rdev
->desc_nr
= choice
;
1617 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1620 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1621 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1622 mdname(mddev
), mddev
->max_disks
);
1625 bdevname(rdev
->bdev
,b
);
1626 while ( (s
=strchr(b
, '/')) != NULL
)
1629 rdev
->mddev
= mddev
;
1630 printk(KERN_INFO
"md: bind<%s>\n", b
);
1632 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1635 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1636 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1637 kobject_del(&rdev
->kobj
);
1640 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1642 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1643 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1645 /* May as well allow recovery to be retried once */
1646 mddev
->recovery_disabled
= 0;
1651 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1656 static void md_delayed_delete(struct work_struct
*ws
)
1658 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1659 kobject_del(&rdev
->kobj
);
1660 kobject_put(&rdev
->kobj
);
1663 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1665 char b
[BDEVNAME_SIZE
];
1670 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1671 list_del_rcu(&rdev
->same_set
);
1672 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1674 sysfs_remove_link(&rdev
->kobj
, "block");
1675 sysfs_put(rdev
->sysfs_state
);
1676 rdev
->sysfs_state
= NULL
;
1677 /* We need to delay this, otherwise we can deadlock when
1678 * writing to 'remove' to "dev/state". We also need
1679 * to delay it due to rcu usage.
1682 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1683 kobject_get(&rdev
->kobj
);
1684 schedule_work(&rdev
->del_work
);
1688 * prevent the device from being mounted, repartitioned or
1689 * otherwise reused by a RAID array (or any other kernel
1690 * subsystem), by bd_claiming the device.
1692 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1695 struct block_device
*bdev
;
1696 char b
[BDEVNAME_SIZE
];
1698 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1700 printk(KERN_ERR
"md: could not open %s.\n",
1701 __bdevname(dev
, b
));
1702 return PTR_ERR(bdev
);
1704 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1706 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1708 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1712 set_bit(AllReserved
, &rdev
->flags
);
1717 static void unlock_rdev(mdk_rdev_t
*rdev
)
1719 struct block_device
*bdev
= rdev
->bdev
;
1724 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1727 void md_autodetect_dev(dev_t dev
);
1729 static void export_rdev(mdk_rdev_t
* rdev
)
1731 char b
[BDEVNAME_SIZE
];
1732 printk(KERN_INFO
"md: export_rdev(%s)\n",
1733 bdevname(rdev
->bdev
,b
));
1738 if (test_bit(AutoDetected
, &rdev
->flags
))
1739 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1742 kobject_put(&rdev
->kobj
);
1745 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1747 unbind_rdev_from_array(rdev
);
1751 static void export_array(mddev_t
*mddev
)
1753 mdk_rdev_t
*rdev
, *tmp
;
1755 rdev_for_each(rdev
, tmp
, mddev
) {
1760 kick_rdev_from_array(rdev
);
1762 if (!list_empty(&mddev
->disks
))
1764 mddev
->raid_disks
= 0;
1765 mddev
->major_version
= 0;
1768 static void print_desc(mdp_disk_t
*desc
)
1770 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1771 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1774 static void print_sb_90(mdp_super_t
*sb
)
1779 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1780 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1781 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1783 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1784 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1785 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1786 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1787 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1788 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1789 sb
->failed_disks
, sb
->spare_disks
,
1790 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1793 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1796 desc
= sb
->disks
+ i
;
1797 if (desc
->number
|| desc
->major
|| desc
->minor
||
1798 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1799 printk(" D %2d: ", i
);
1803 printk(KERN_INFO
"md: THIS: ");
1804 print_desc(&sb
->this_disk
);
1807 static void print_sb_1(struct mdp_superblock_1
*sb
)
1811 uuid
= sb
->set_uuid
;
1813 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1814 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1815 "md: Name: \"%s\" CT:%llu\n",
1816 le32_to_cpu(sb
->major_version
),
1817 le32_to_cpu(sb
->feature_map
),
1818 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1819 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1820 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1821 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1823 (unsigned long long)le64_to_cpu(sb
->ctime
)
1824 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1826 uuid
= sb
->device_uuid
;
1828 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1830 "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1831 ":%02x%02x%02x%02x%02x%02x\n"
1832 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1833 "md: (MaxDev:%u) \n",
1834 le32_to_cpu(sb
->level
),
1835 (unsigned long long)le64_to_cpu(sb
->size
),
1836 le32_to_cpu(sb
->raid_disks
),
1837 le32_to_cpu(sb
->layout
),
1838 le32_to_cpu(sb
->chunksize
),
1839 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1840 (unsigned long long)le64_to_cpu(sb
->data_size
),
1841 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1842 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1843 le32_to_cpu(sb
->dev_number
),
1844 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1845 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1846 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1847 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1849 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1850 (unsigned long long)le64_to_cpu(sb
->events
),
1851 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1852 le32_to_cpu(sb
->sb_csum
),
1853 le32_to_cpu(sb
->max_dev
)
1857 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1859 char b
[BDEVNAME_SIZE
];
1860 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1861 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
1862 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1864 if (rdev
->sb_loaded
) {
1865 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1866 switch (major_version
) {
1868 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1871 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
1875 printk(KERN_INFO
"md: no rdev superblock!\n");
1878 static void md_print_devices(void)
1880 struct list_head
*tmp
;
1883 char b
[BDEVNAME_SIZE
];
1886 printk("md: **********************************\n");
1887 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1888 printk("md: **********************************\n");
1889 for_each_mddev(mddev
, tmp
) {
1892 bitmap_print_sb(mddev
->bitmap
);
1894 printk("%s: ", mdname(mddev
));
1895 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1896 printk("<%s>", bdevname(rdev
->bdev
,b
));
1899 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1900 print_rdev(rdev
, mddev
->major_version
);
1902 printk("md: **********************************\n");
1907 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1909 /* Update each superblock (in-memory image), but
1910 * if we are allowed to, skip spares which already
1911 * have the right event counter, or have one earlier
1912 * (which would mean they aren't being marked as dirty
1913 * with the rest of the array)
1917 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1918 if (rdev
->sb_events
== mddev
->events
||
1920 rdev
->raid_disk
< 0 &&
1921 (rdev
->sb_events
&1)==0 &&
1922 rdev
->sb_events
+1 == mddev
->events
)) {
1923 /* Don't update this superblock */
1924 rdev
->sb_loaded
= 2;
1926 super_types
[mddev
->major_version
].
1927 sync_super(mddev
, rdev
);
1928 rdev
->sb_loaded
= 1;
1933 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1939 mddev
->utime
= get_seconds();
1940 if (mddev
->external
)
1943 spin_lock_irq(&mddev
->write_lock
);
1945 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1946 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1948 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1949 /* just a clean<-> dirty transition, possibly leave spares alone,
1950 * though if events isn't the right even/odd, we will have to do
1956 if (mddev
->degraded
)
1957 /* If the array is degraded, then skipping spares is both
1958 * dangerous and fairly pointless.
1959 * Dangerous because a device that was removed from the array
1960 * might have a event_count that still looks up-to-date,
1961 * so it can be re-added without a resync.
1962 * Pointless because if there are any spares to skip,
1963 * then a recovery will happen and soon that array won't
1964 * be degraded any more and the spare can go back to sleep then.
1968 sync_req
= mddev
->in_sync
;
1970 /* If this is just a dirty<->clean transition, and the array is clean
1971 * and 'events' is odd, we can roll back to the previous clean state */
1973 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1974 && (mddev
->events
& 1)
1975 && mddev
->events
!= 1)
1978 /* otherwise we have to go forward and ... */
1980 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1981 /* .. if the array isn't clean, an 'even' event must also go
1983 if ((mddev
->events
&1)==0)
1986 /* otherwise an 'odd' event must go to spares */
1987 if ((mddev
->events
&1))
1992 if (!mddev
->events
) {
1994 * oops, this 64-bit counter should never wrap.
1995 * Either we are in around ~1 trillion A.C., assuming
1996 * 1 reboot per second, or we have a bug:
2003 * do not write anything to disk if using
2004 * nonpersistent superblocks
2006 if (!mddev
->persistent
) {
2007 if (!mddev
->external
)
2008 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2010 spin_unlock_irq(&mddev
->write_lock
);
2011 wake_up(&mddev
->sb_wait
);
2014 sync_sbs(mddev
, nospares
);
2015 spin_unlock_irq(&mddev
->write_lock
);
2018 "md: updating %s RAID superblock on device (in sync %d)\n",
2019 mdname(mddev
),mddev
->in_sync
);
2021 bitmap_update_sb(mddev
->bitmap
);
2022 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2023 char b
[BDEVNAME_SIZE
];
2024 dprintk(KERN_INFO
"md: ");
2025 if (rdev
->sb_loaded
!= 1)
2026 continue; /* no noise on spare devices */
2027 if (test_bit(Faulty
, &rdev
->flags
))
2028 dprintk("(skipping faulty ");
2030 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2031 if (!test_bit(Faulty
, &rdev
->flags
)) {
2032 md_super_write(mddev
,rdev
,
2033 rdev
->sb_start
, rdev
->sb_size
,
2035 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2036 bdevname(rdev
->bdev
,b
),
2037 (unsigned long long)rdev
->sb_start
);
2038 rdev
->sb_events
= mddev
->events
;
2042 if (mddev
->level
== LEVEL_MULTIPATH
)
2043 /* only need to write one superblock... */
2046 md_super_wait(mddev
);
2047 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2049 spin_lock_irq(&mddev
->write_lock
);
2050 if (mddev
->in_sync
!= sync_req
||
2051 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2052 /* have to write it out again */
2053 spin_unlock_irq(&mddev
->write_lock
);
2056 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2057 spin_unlock_irq(&mddev
->write_lock
);
2058 wake_up(&mddev
->sb_wait
);
2059 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2060 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2064 /* words written to sysfs files may, or may not, be \n terminated.
2065 * We want to accept with case. For this we use cmd_match.
2067 static int cmd_match(const char *cmd
, const char *str
)
2069 /* See if cmd, written into a sysfs file, matches
2070 * str. They must either be the same, or cmd can
2071 * have a trailing newline
2073 while (*cmd
&& *str
&& *cmd
== *str
) {
2084 struct rdev_sysfs_entry
{
2085 struct attribute attr
;
2086 ssize_t (*show
)(mdk_rdev_t
*, char *);
2087 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2091 state_show(mdk_rdev_t
*rdev
, char *page
)
2096 if (test_bit(Faulty
, &rdev
->flags
)) {
2097 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2100 if (test_bit(In_sync
, &rdev
->flags
)) {
2101 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2104 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2105 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2108 if (test_bit(Blocked
, &rdev
->flags
)) {
2109 len
+= sprintf(page
+len
, "%sblocked", sep
);
2112 if (!test_bit(Faulty
, &rdev
->flags
) &&
2113 !test_bit(In_sync
, &rdev
->flags
)) {
2114 len
+= sprintf(page
+len
, "%sspare", sep
);
2117 return len
+sprintf(page
+len
, "\n");
2121 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2124 * faulty - simulates and error
2125 * remove - disconnects the device
2126 * writemostly - sets write_mostly
2127 * -writemostly - clears write_mostly
2128 * blocked - sets the Blocked flag
2129 * -blocked - clears the Blocked flag
2130 * insync - sets Insync providing device isn't active
2133 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2134 md_error(rdev
->mddev
, rdev
);
2136 } else if (cmd_match(buf
, "remove")) {
2137 if (rdev
->raid_disk
>= 0)
2140 mddev_t
*mddev
= rdev
->mddev
;
2141 kick_rdev_from_array(rdev
);
2143 md_update_sb(mddev
, 1);
2144 md_new_event(mddev
);
2147 } else if (cmd_match(buf
, "writemostly")) {
2148 set_bit(WriteMostly
, &rdev
->flags
);
2150 } else if (cmd_match(buf
, "-writemostly")) {
2151 clear_bit(WriteMostly
, &rdev
->flags
);
2153 } else if (cmd_match(buf
, "blocked")) {
2154 set_bit(Blocked
, &rdev
->flags
);
2156 } else if (cmd_match(buf
, "-blocked")) {
2157 clear_bit(Blocked
, &rdev
->flags
);
2158 wake_up(&rdev
->blocked_wait
);
2159 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2160 md_wakeup_thread(rdev
->mddev
->thread
);
2163 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2164 set_bit(In_sync
, &rdev
->flags
);
2167 if (!err
&& rdev
->sysfs_state
)
2168 sysfs_notify_dirent(rdev
->sysfs_state
);
2169 return err
? err
: len
;
2171 static struct rdev_sysfs_entry rdev_state
=
2172 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2175 errors_show(mdk_rdev_t
*rdev
, char *page
)
2177 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2181 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2184 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2185 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2186 atomic_set(&rdev
->corrected_errors
, n
);
2191 static struct rdev_sysfs_entry rdev_errors
=
2192 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2195 slot_show(mdk_rdev_t
*rdev
, char *page
)
2197 if (rdev
->raid_disk
< 0)
2198 return sprintf(page
, "none\n");
2200 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2204 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2209 int slot
= simple_strtoul(buf
, &e
, 10);
2210 if (strncmp(buf
, "none", 4)==0)
2212 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2214 if (rdev
->mddev
->pers
&& slot
== -1) {
2215 /* Setting 'slot' on an active array requires also
2216 * updating the 'rd%d' link, and communicating
2217 * with the personality with ->hot_*_disk.
2218 * For now we only support removing
2219 * failed/spare devices. This normally happens automatically,
2220 * but not when the metadata is externally managed.
2222 if (rdev
->raid_disk
== -1)
2224 /* personality does all needed checks */
2225 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2227 err
= rdev
->mddev
->pers
->
2228 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2231 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2232 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2233 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2234 md_wakeup_thread(rdev
->mddev
->thread
);
2235 } else if (rdev
->mddev
->pers
) {
2237 /* Activating a spare .. or possibly reactivating
2238 * if we ever get bitmaps working here.
2241 if (rdev
->raid_disk
!= -1)
2244 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2247 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2248 if (rdev2
->raid_disk
== slot
)
2251 rdev
->raid_disk
= slot
;
2252 if (test_bit(In_sync
, &rdev
->flags
))
2253 rdev
->saved_raid_disk
= slot
;
2255 rdev
->saved_raid_disk
= -1;
2256 err
= rdev
->mddev
->pers
->
2257 hot_add_disk(rdev
->mddev
, rdev
);
2259 rdev
->raid_disk
= -1;
2262 sysfs_notify_dirent(rdev
->sysfs_state
);
2263 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2264 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2266 "md: cannot register "
2268 nm
, mdname(rdev
->mddev
));
2270 /* don't wakeup anyone, leave that to userspace. */
2272 if (slot
>= rdev
->mddev
->raid_disks
)
2274 rdev
->raid_disk
= slot
;
2275 /* assume it is working */
2276 clear_bit(Faulty
, &rdev
->flags
);
2277 clear_bit(WriteMostly
, &rdev
->flags
);
2278 set_bit(In_sync
, &rdev
->flags
);
2279 sysfs_notify_dirent(rdev
->sysfs_state
);
2285 static struct rdev_sysfs_entry rdev_slot
=
2286 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2289 offset_show(mdk_rdev_t
*rdev
, char *page
)
2291 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2295 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2298 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2299 if (e
==buf
|| (*e
&& *e
!= '\n'))
2301 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2303 if (rdev
->sectors
&& rdev
->mddev
->external
)
2304 /* Must set offset before size, so overlap checks
2307 rdev
->data_offset
= offset
;
2311 static struct rdev_sysfs_entry rdev_offset
=
2312 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2315 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2317 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2320 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2322 /* check if two start/length pairs overlap */
2330 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2332 unsigned long long blocks
;
2335 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2338 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2339 return -EINVAL
; /* sector conversion overflow */
2342 if (new != blocks
* 2)
2343 return -EINVAL
; /* unsigned long long to sector_t overflow */
2350 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2352 mddev_t
*my_mddev
= rdev
->mddev
;
2353 sector_t oldsectors
= rdev
->sectors
;
2356 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2358 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2359 if (my_mddev
->persistent
) {
2360 sectors
= super_types
[my_mddev
->major_version
].
2361 rdev_size_change(rdev
, sectors
);
2364 } else if (!sectors
)
2365 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2368 if (sectors
< my_mddev
->dev_sectors
)
2369 return -EINVAL
; /* component must fit device */
2371 rdev
->sectors
= sectors
;
2372 if (sectors
> oldsectors
&& my_mddev
->external
) {
2373 /* need to check that all other rdevs with the same ->bdev
2374 * do not overlap. We need to unlock the mddev to avoid
2375 * a deadlock. We have already changed rdev->sectors, and if
2376 * we have to change it back, we will have the lock again.
2380 struct list_head
*tmp
;
2382 mddev_unlock(my_mddev
);
2383 for_each_mddev(mddev
, tmp
) {
2387 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2388 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2389 (rdev
->bdev
== rdev2
->bdev
&&
2391 overlaps(rdev
->data_offset
, rdev
->sectors
,
2397 mddev_unlock(mddev
);
2403 mddev_lock(my_mddev
);
2405 /* Someone else could have slipped in a size
2406 * change here, but doing so is just silly.
2407 * We put oldsectors back because we *know* it is
2408 * safe, and trust userspace not to race with
2411 rdev
->sectors
= oldsectors
;
2418 static struct rdev_sysfs_entry rdev_size
=
2419 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2421 static struct attribute
*rdev_default_attrs
[] = {
2430 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2432 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2433 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2434 mddev_t
*mddev
= rdev
->mddev
;
2440 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2442 if (rdev
->mddev
== NULL
)
2445 rv
= entry
->show(rdev
, page
);
2446 mddev_unlock(mddev
);
2452 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2453 const char *page
, size_t length
)
2455 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2456 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2458 mddev_t
*mddev
= rdev
->mddev
;
2462 if (!capable(CAP_SYS_ADMIN
))
2464 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2466 if (rdev
->mddev
== NULL
)
2469 rv
= entry
->store(rdev
, page
, length
);
2470 mddev_unlock(mddev
);
2475 static void rdev_free(struct kobject
*ko
)
2477 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2480 static struct sysfs_ops rdev_sysfs_ops
= {
2481 .show
= rdev_attr_show
,
2482 .store
= rdev_attr_store
,
2484 static struct kobj_type rdev_ktype
= {
2485 .release
= rdev_free
,
2486 .sysfs_ops
= &rdev_sysfs_ops
,
2487 .default_attrs
= rdev_default_attrs
,
2491 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2493 * mark the device faulty if:
2495 * - the device is nonexistent (zero size)
2496 * - the device has no valid superblock
2498 * a faulty rdev _never_ has rdev->sb set.
2500 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2502 char b
[BDEVNAME_SIZE
];
2507 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2509 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2510 return ERR_PTR(-ENOMEM
);
2513 if ((err
= alloc_disk_sb(rdev
)))
2516 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2520 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2523 rdev
->saved_raid_disk
= -1;
2524 rdev
->raid_disk
= -1;
2526 rdev
->data_offset
= 0;
2527 rdev
->sb_events
= 0;
2528 atomic_set(&rdev
->nr_pending
, 0);
2529 atomic_set(&rdev
->read_errors
, 0);
2530 atomic_set(&rdev
->corrected_errors
, 0);
2532 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2535 "md: %s has zero or unknown size, marking faulty!\n",
2536 bdevname(rdev
->bdev
,b
));
2541 if (super_format
>= 0) {
2542 err
= super_types
[super_format
].
2543 load_super(rdev
, NULL
, super_minor
);
2544 if (err
== -EINVAL
) {
2546 "md: %s does not have a valid v%d.%d "
2547 "superblock, not importing!\n",
2548 bdevname(rdev
->bdev
,b
),
2549 super_format
, super_minor
);
2554 "md: could not read %s's sb, not importing!\n",
2555 bdevname(rdev
->bdev
,b
));
2560 INIT_LIST_HEAD(&rdev
->same_set
);
2561 init_waitqueue_head(&rdev
->blocked_wait
);
2566 if (rdev
->sb_page
) {
2572 return ERR_PTR(err
);
2576 * Check a full RAID array for plausibility
2580 static void analyze_sbs(mddev_t
* mddev
)
2583 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2584 char b
[BDEVNAME_SIZE
];
2587 rdev_for_each(rdev
, tmp
, mddev
)
2588 switch (super_types
[mddev
->major_version
].
2589 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2597 "md: fatal superblock inconsistency in %s"
2598 " -- removing from array\n",
2599 bdevname(rdev
->bdev
,b
));
2600 kick_rdev_from_array(rdev
);
2604 super_types
[mddev
->major_version
].
2605 validate_super(mddev
, freshest
);
2608 rdev_for_each(rdev
, tmp
, mddev
) {
2609 if (rdev
->desc_nr
>= mddev
->max_disks
||
2610 i
> mddev
->max_disks
) {
2612 "md: %s: %s: only %d devices permitted\n",
2613 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2615 kick_rdev_from_array(rdev
);
2618 if (rdev
!= freshest
)
2619 if (super_types
[mddev
->major_version
].
2620 validate_super(mddev
, rdev
)) {
2621 printk(KERN_WARNING
"md: kicking non-fresh %s"
2623 bdevname(rdev
->bdev
,b
));
2624 kick_rdev_from_array(rdev
);
2627 if (mddev
->level
== LEVEL_MULTIPATH
) {
2628 rdev
->desc_nr
= i
++;
2629 rdev
->raid_disk
= rdev
->desc_nr
;
2630 set_bit(In_sync
, &rdev
->flags
);
2631 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2632 rdev
->raid_disk
= -1;
2633 clear_bit(In_sync
, &rdev
->flags
);
2638 static void md_safemode_timeout(unsigned long data
);
2641 safe_delay_show(mddev_t
*mddev
, char *page
)
2643 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2644 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2647 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2655 /* remove a period, and count digits after it */
2656 if (len
>= sizeof(buf
))
2658 strlcpy(buf
, cbuf
, sizeof(buf
));
2659 for (i
=0; i
<len
; i
++) {
2661 if (isdigit(buf
[i
])) {
2666 } else if (buf
[i
] == '.') {
2671 if (strict_strtoul(buf
, 10, &msec
) < 0)
2673 msec
= (msec
* 1000) / scale
;
2675 mddev
->safemode_delay
= 0;
2677 unsigned long old_delay
= mddev
->safemode_delay
;
2678 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2679 if (mddev
->safemode_delay
== 0)
2680 mddev
->safemode_delay
= 1;
2681 if (mddev
->safemode_delay
< old_delay
)
2682 md_safemode_timeout((unsigned long)mddev
);
2686 static struct md_sysfs_entry md_safe_delay
=
2687 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2690 level_show(mddev_t
*mddev
, char *page
)
2692 struct mdk_personality
*p
= mddev
->pers
;
2694 return sprintf(page
, "%s\n", p
->name
);
2695 else if (mddev
->clevel
[0])
2696 return sprintf(page
, "%s\n", mddev
->clevel
);
2697 else if (mddev
->level
!= LEVEL_NONE
)
2698 return sprintf(page
, "%d\n", mddev
->level
);
2704 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2708 struct mdk_personality
*pers
;
2712 if (mddev
->pers
== NULL
) {
2715 if (len
>= sizeof(mddev
->clevel
))
2717 strncpy(mddev
->clevel
, buf
, len
);
2718 if (mddev
->clevel
[len
-1] == '\n')
2720 mddev
->clevel
[len
] = 0;
2721 mddev
->level
= LEVEL_NONE
;
2725 /* request to change the personality. Need to ensure:
2726 * - array is not engaged in resync/recovery/reshape
2727 * - old personality can be suspended
2728 * - new personality will access other array.
2731 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
2734 if (!mddev
->pers
->quiesce
) {
2735 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
2736 mdname(mddev
), mddev
->pers
->name
);
2740 /* Now find the new personality */
2741 if (len
== 0 || len
>= sizeof(level
))
2743 strncpy(level
, buf
, len
);
2744 if (level
[len
-1] == '\n')
2748 request_module("md-%s", level
);
2749 spin_lock(&pers_lock
);
2750 pers
= find_pers(LEVEL_NONE
, level
);
2751 if (!pers
|| !try_module_get(pers
->owner
)) {
2752 spin_unlock(&pers_lock
);
2753 printk(KERN_WARNING
"md: personality %s not loaded\n", level
);
2756 spin_unlock(&pers_lock
);
2758 if (pers
== mddev
->pers
) {
2759 /* Nothing to do! */
2760 module_put(pers
->owner
);
2763 if (!pers
->takeover
) {
2764 module_put(pers
->owner
);
2765 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
2766 mdname(mddev
), level
);
2770 /* ->takeover must set new_* and/or delta_disks
2771 * if it succeeds, and may set them when it fails.
2773 priv
= pers
->takeover(mddev
);
2775 mddev
->new_level
= mddev
->level
;
2776 mddev
->new_layout
= mddev
->layout
;
2777 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
2778 mddev
->raid_disks
-= mddev
->delta_disks
;
2779 mddev
->delta_disks
= 0;
2780 module_put(pers
->owner
);
2781 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
2782 mdname(mddev
), level
);
2783 return PTR_ERR(priv
);
2786 /* Looks like we have a winner */
2787 mddev_suspend(mddev
);
2788 mddev
->pers
->stop(mddev
);
2789 module_put(mddev
->pers
->owner
);
2790 /* Invalidate devices that are now superfluous */
2791 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2792 if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2793 rdev
->raid_disk
= -1;
2794 clear_bit(In_sync
, &rdev
->flags
);
2797 mddev
->private = priv
;
2798 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2799 mddev
->level
= mddev
->new_level
;
2800 mddev
->layout
= mddev
->new_layout
;
2801 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
2802 mddev
->delta_disks
= 0;
2804 mddev_resume(mddev
);
2805 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2806 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2807 md_wakeup_thread(mddev
->thread
);
2811 static struct md_sysfs_entry md_level
=
2812 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2816 layout_show(mddev_t
*mddev
, char *page
)
2818 /* just a number, not meaningful for all levels */
2819 if (mddev
->reshape_position
!= MaxSector
&&
2820 mddev
->layout
!= mddev
->new_layout
)
2821 return sprintf(page
, "%d (%d)\n",
2822 mddev
->new_layout
, mddev
->layout
);
2823 return sprintf(page
, "%d\n", mddev
->layout
);
2827 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2830 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2832 if (!*buf
|| (*e
&& *e
!= '\n'))
2837 if (mddev
->pers
->check_reshape
== NULL
)
2839 mddev
->new_layout
= n
;
2840 err
= mddev
->pers
->check_reshape(mddev
);
2842 mddev
->new_layout
= mddev
->layout
;
2846 mddev
->new_layout
= n
;
2847 if (mddev
->reshape_position
== MaxSector
)
2852 static struct md_sysfs_entry md_layout
=
2853 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2857 raid_disks_show(mddev_t
*mddev
, char *page
)
2859 if (mddev
->raid_disks
== 0)
2861 if (mddev
->reshape_position
!= MaxSector
&&
2862 mddev
->delta_disks
!= 0)
2863 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2864 mddev
->raid_disks
- mddev
->delta_disks
);
2865 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2868 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2871 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2875 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2877 if (!*buf
|| (*e
&& *e
!= '\n'))
2881 rv
= update_raid_disks(mddev
, n
);
2882 else if (mddev
->reshape_position
!= MaxSector
) {
2883 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2884 mddev
->delta_disks
= n
- olddisks
;
2885 mddev
->raid_disks
= n
;
2887 mddev
->raid_disks
= n
;
2888 return rv
? rv
: len
;
2890 static struct md_sysfs_entry md_raid_disks
=
2891 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2894 chunk_size_show(mddev_t
*mddev
, char *page
)
2896 if (mddev
->reshape_position
!= MaxSector
&&
2897 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
2898 return sprintf(page
, "%d (%d)\n",
2899 mddev
->new_chunk_sectors
<< 9,
2900 mddev
->chunk_sectors
<< 9);
2901 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
2905 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2908 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2910 if (!*buf
|| (*e
&& *e
!= '\n'))
2915 if (mddev
->pers
->check_reshape
== NULL
)
2917 mddev
->new_chunk_sectors
= n
>> 9;
2918 err
= mddev
->pers
->check_reshape(mddev
);
2920 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
2924 mddev
->new_chunk_sectors
= n
>> 9;
2925 if (mddev
->reshape_position
== MaxSector
)
2926 mddev
->chunk_sectors
= n
>> 9;
2930 static struct md_sysfs_entry md_chunk_size
=
2931 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2934 resync_start_show(mddev_t
*mddev
, char *page
)
2936 if (mddev
->recovery_cp
== MaxSector
)
2937 return sprintf(page
, "none\n");
2938 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2942 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2945 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2949 if (!*buf
|| (*e
&& *e
!= '\n'))
2952 mddev
->recovery_cp
= n
;
2955 static struct md_sysfs_entry md_resync_start
=
2956 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2959 * The array state can be:
2962 * No devices, no size, no level
2963 * Equivalent to STOP_ARRAY ioctl
2965 * May have some settings, but array is not active
2966 * all IO results in error
2967 * When written, doesn't tear down array, but just stops it
2968 * suspended (not supported yet)
2969 * All IO requests will block. The array can be reconfigured.
2970 * Writing this, if accepted, will block until array is quiescent
2972 * no resync can happen. no superblocks get written.
2973 * write requests fail
2975 * like readonly, but behaves like 'clean' on a write request.
2977 * clean - no pending writes, but otherwise active.
2978 * When written to inactive array, starts without resync
2979 * If a write request arrives then
2980 * if metadata is known, mark 'dirty' and switch to 'active'.
2981 * if not known, block and switch to write-pending
2982 * If written to an active array that has pending writes, then fails.
2984 * fully active: IO and resync can be happening.
2985 * When written to inactive array, starts with resync
2988 * clean, but writes are blocked waiting for 'active' to be written.
2991 * like active, but no writes have been seen for a while (100msec).
2994 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2995 write_pending
, active_idle
, bad_word
};
2996 static char *array_states
[] = {
2997 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2998 "write-pending", "active-idle", NULL
};
3000 static int match_word(const char *word
, char **list
)
3003 for (n
=0; list
[n
]; n
++)
3004 if (cmd_match(word
, list
[n
]))
3010 array_state_show(mddev_t
*mddev
, char *page
)
3012 enum array_state st
= inactive
;
3025 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
3027 else if (mddev
->safemode
)
3033 if (list_empty(&mddev
->disks
) &&
3034 mddev
->raid_disks
== 0 &&
3035 mddev
->dev_sectors
== 0)
3040 return sprintf(page
, "%s\n", array_states
[st
]);
3043 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3044 static int do_md_run(mddev_t
* mddev
);
3045 static int restart_array(mddev_t
*mddev
);
3048 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3051 enum array_state st
= match_word(buf
, array_states
);
3056 /* stopping an active array */
3057 if (atomic_read(&mddev
->openers
) > 0)
3059 err
= do_md_stop(mddev
, 0, 0);
3062 /* stopping an active array */
3064 if (atomic_read(&mddev
->openers
) > 0)
3066 err
= do_md_stop(mddev
, 2, 0);
3068 err
= 0; /* already inactive */
3071 break; /* not supported yet */
3074 err
= do_md_stop(mddev
, 1, 0);
3077 set_disk_ro(mddev
->gendisk
, 1);
3078 err
= do_md_run(mddev
);
3084 err
= do_md_stop(mddev
, 1, 0);
3085 else if (mddev
->ro
== 1)
3086 err
= restart_array(mddev
);
3089 set_disk_ro(mddev
->gendisk
, 0);
3093 err
= do_md_run(mddev
);
3098 restart_array(mddev
);
3099 spin_lock_irq(&mddev
->write_lock
);
3100 if (atomic_read(&mddev
->writes_pending
) == 0) {
3101 if (mddev
->in_sync
== 0) {
3103 if (mddev
->safemode
== 1)
3104 mddev
->safemode
= 0;
3105 if (mddev
->persistent
)
3106 set_bit(MD_CHANGE_CLEAN
,
3112 spin_unlock_irq(&mddev
->write_lock
);
3118 restart_array(mddev
);
3119 if (mddev
->external
)
3120 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3121 wake_up(&mddev
->sb_wait
);
3125 set_disk_ro(mddev
->gendisk
, 0);
3126 err
= do_md_run(mddev
);
3131 /* these cannot be set */
3137 sysfs_notify_dirent(mddev
->sysfs_state
);
3141 static struct md_sysfs_entry md_array_state
=
3142 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3145 null_show(mddev_t
*mddev
, char *page
)
3151 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3153 /* buf must be %d:%d\n? giving major and minor numbers */
3154 /* The new device is added to the array.
3155 * If the array has a persistent superblock, we read the
3156 * superblock to initialise info and check validity.
3157 * Otherwise, only checking done is that in bind_rdev_to_array,
3158 * which mainly checks size.
3161 int major
= simple_strtoul(buf
, &e
, 10);
3167 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3169 minor
= simple_strtoul(e
+1, &e
, 10);
3170 if (*e
&& *e
!= '\n')
3172 dev
= MKDEV(major
, minor
);
3173 if (major
!= MAJOR(dev
) ||
3174 minor
!= MINOR(dev
))
3178 if (mddev
->persistent
) {
3179 rdev
= md_import_device(dev
, mddev
->major_version
,
3180 mddev
->minor_version
);
3181 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3182 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3183 mdk_rdev_t
, same_set
);
3184 err
= super_types
[mddev
->major_version
]
3185 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3189 } else if (mddev
->external
)
3190 rdev
= md_import_device(dev
, -2, -1);
3192 rdev
= md_import_device(dev
, -1, -1);
3195 return PTR_ERR(rdev
);
3196 err
= bind_rdev_to_array(rdev
, mddev
);
3200 return err
? err
: len
;
3203 static struct md_sysfs_entry md_new_device
=
3204 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3207 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3210 unsigned long chunk
, end_chunk
;
3214 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3216 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3217 if (buf
== end
) break;
3218 if (*end
== '-') { /* range */
3220 end_chunk
= simple_strtoul(buf
, &end
, 0);
3221 if (buf
== end
) break;
3223 if (*end
&& !isspace(*end
)) break;
3224 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3226 while (isspace(*buf
)) buf
++;
3228 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3233 static struct md_sysfs_entry md_bitmap
=
3234 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3237 size_show(mddev_t
*mddev
, char *page
)
3239 return sprintf(page
, "%llu\n",
3240 (unsigned long long)mddev
->dev_sectors
/ 2);
3243 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3246 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3248 /* If array is inactive, we can reduce the component size, but
3249 * not increase it (except from 0).
3250 * If array is active, we can try an on-line resize
3253 int err
= strict_blocks_to_sectors(buf
, §ors
);
3258 err
= update_size(mddev
, sectors
);
3259 md_update_sb(mddev
, 1);
3261 if (mddev
->dev_sectors
== 0 ||
3262 mddev
->dev_sectors
> sectors
)
3263 mddev
->dev_sectors
= sectors
;
3267 return err
? err
: len
;
3270 static struct md_sysfs_entry md_size
=
3271 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3276 * 'none' for arrays with no metadata (good luck...)
3277 * 'external' for arrays with externally managed metadata,
3278 * or N.M for internally known formats
3281 metadata_show(mddev_t
*mddev
, char *page
)
3283 if (mddev
->persistent
)
3284 return sprintf(page
, "%d.%d\n",
3285 mddev
->major_version
, mddev
->minor_version
);
3286 else if (mddev
->external
)
3287 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3289 return sprintf(page
, "none\n");
3293 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3297 /* Changing the details of 'external' metadata is
3298 * always permitted. Otherwise there must be
3299 * no devices attached to the array.
3301 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3303 else if (!list_empty(&mddev
->disks
))
3306 if (cmd_match(buf
, "none")) {
3307 mddev
->persistent
= 0;
3308 mddev
->external
= 0;
3309 mddev
->major_version
= 0;
3310 mddev
->minor_version
= 90;
3313 if (strncmp(buf
, "external:", 9) == 0) {
3314 size_t namelen
= len
-9;
3315 if (namelen
>= sizeof(mddev
->metadata_type
))
3316 namelen
= sizeof(mddev
->metadata_type
)-1;
3317 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3318 mddev
->metadata_type
[namelen
] = 0;
3319 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3320 mddev
->metadata_type
[--namelen
] = 0;
3321 mddev
->persistent
= 0;
3322 mddev
->external
= 1;
3323 mddev
->major_version
= 0;
3324 mddev
->minor_version
= 90;
3327 major
= simple_strtoul(buf
, &e
, 10);
3328 if (e
==buf
|| *e
!= '.')
3331 minor
= simple_strtoul(buf
, &e
, 10);
3332 if (e
==buf
|| (*e
&& *e
!= '\n') )
3334 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3336 mddev
->major_version
= major
;
3337 mddev
->minor_version
= minor
;
3338 mddev
->persistent
= 1;
3339 mddev
->external
= 0;
3343 static struct md_sysfs_entry md_metadata
=
3344 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3347 action_show(mddev_t
*mddev
, char *page
)
3349 char *type
= "idle";
3350 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3352 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3353 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3354 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3356 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3357 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3359 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3363 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3366 return sprintf(page
, "%s\n", type
);
3370 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3372 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3375 if (cmd_match(page
, "frozen"))
3376 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3378 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3380 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3381 if (mddev
->sync_thread
) {
3382 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3383 md_unregister_thread(mddev
->sync_thread
);
3384 mddev
->sync_thread
= NULL
;
3385 mddev
->recovery
= 0;
3387 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3388 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3390 else if (cmd_match(page
, "resync"))
3391 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3392 else if (cmd_match(page
, "recover")) {
3393 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3394 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3395 } else if (cmd_match(page
, "reshape")) {
3397 if (mddev
->pers
->start_reshape
== NULL
)
3399 err
= mddev
->pers
->start_reshape(mddev
);
3402 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3404 if (cmd_match(page
, "check"))
3405 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3406 else if (!cmd_match(page
, "repair"))
3408 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3409 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3411 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3412 md_wakeup_thread(mddev
->thread
);
3413 sysfs_notify_dirent(mddev
->sysfs_action
);
3418 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3420 return sprintf(page
, "%llu\n",
3421 (unsigned long long) mddev
->resync_mismatches
);
3424 static struct md_sysfs_entry md_scan_mode
=
3425 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3428 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3431 sync_min_show(mddev_t
*mddev
, char *page
)
3433 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3434 mddev
->sync_speed_min
? "local": "system");
3438 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3442 if (strncmp(buf
, "system", 6)==0) {
3443 mddev
->sync_speed_min
= 0;
3446 min
= simple_strtoul(buf
, &e
, 10);
3447 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3449 mddev
->sync_speed_min
= min
;
3453 static struct md_sysfs_entry md_sync_min
=
3454 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3457 sync_max_show(mddev_t
*mddev
, char *page
)
3459 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3460 mddev
->sync_speed_max
? "local": "system");
3464 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3468 if (strncmp(buf
, "system", 6)==0) {
3469 mddev
->sync_speed_max
= 0;
3472 max
= simple_strtoul(buf
, &e
, 10);
3473 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3475 mddev
->sync_speed_max
= max
;
3479 static struct md_sysfs_entry md_sync_max
=
3480 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3483 degraded_show(mddev_t
*mddev
, char *page
)
3485 return sprintf(page
, "%d\n", mddev
->degraded
);
3487 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3490 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3492 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3496 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3500 if (strict_strtol(buf
, 10, &n
))
3503 if (n
!= 0 && n
!= 1)
3506 mddev
->parallel_resync
= n
;
3508 if (mddev
->sync_thread
)
3509 wake_up(&resync_wait
);
3514 /* force parallel resync, even with shared block devices */
3515 static struct md_sysfs_entry md_sync_force_parallel
=
3516 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3517 sync_force_parallel_show
, sync_force_parallel_store
);
3520 sync_speed_show(mddev_t
*mddev
, char *page
)
3522 unsigned long resync
, dt
, db
;
3523 if (mddev
->curr_resync
== 0)
3524 return sprintf(page
, "none\n");
3525 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3526 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3528 db
= resync
- mddev
->resync_mark_cnt
;
3529 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3532 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3535 sync_completed_show(mddev_t
*mddev
, char *page
)
3537 unsigned long max_sectors
, resync
;
3539 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3540 return sprintf(page
, "none\n");
3542 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3543 max_sectors
= mddev
->resync_max_sectors
;
3545 max_sectors
= mddev
->dev_sectors
;
3547 resync
= mddev
->curr_resync_completed
;
3548 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3551 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3554 min_sync_show(mddev_t
*mddev
, char *page
)
3556 return sprintf(page
, "%llu\n",
3557 (unsigned long long)mddev
->resync_min
);
3560 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3562 unsigned long long min
;
3563 if (strict_strtoull(buf
, 10, &min
))
3565 if (min
> mddev
->resync_max
)
3567 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3570 /* Must be a multiple of chunk_size */
3571 if (mddev
->chunk_sectors
) {
3572 sector_t temp
= min
;
3573 if (sector_div(temp
, mddev
->chunk_sectors
))
3576 mddev
->resync_min
= min
;
3581 static struct md_sysfs_entry md_min_sync
=
3582 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3585 max_sync_show(mddev_t
*mddev
, char *page
)
3587 if (mddev
->resync_max
== MaxSector
)
3588 return sprintf(page
, "max\n");
3590 return sprintf(page
, "%llu\n",
3591 (unsigned long long)mddev
->resync_max
);
3594 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3596 if (strncmp(buf
, "max", 3) == 0)
3597 mddev
->resync_max
= MaxSector
;
3599 unsigned long long max
;
3600 if (strict_strtoull(buf
, 10, &max
))
3602 if (max
< mddev
->resync_min
)
3604 if (max
< mddev
->resync_max
&&
3606 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3609 /* Must be a multiple of chunk_size */
3610 if (mddev
->chunk_sectors
) {
3611 sector_t temp
= max
;
3612 if (sector_div(temp
, mddev
->chunk_sectors
))
3615 mddev
->resync_max
= max
;
3617 wake_up(&mddev
->recovery_wait
);
3621 static struct md_sysfs_entry md_max_sync
=
3622 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3625 suspend_lo_show(mddev_t
*mddev
, char *page
)
3627 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3631 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3634 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3636 if (mddev
->pers
== NULL
||
3637 mddev
->pers
->quiesce
== NULL
)
3639 if (buf
== e
|| (*e
&& *e
!= '\n'))
3641 if (new >= mddev
->suspend_hi
||
3642 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3643 mddev
->suspend_lo
= new;
3644 mddev
->pers
->quiesce(mddev
, 2);
3649 static struct md_sysfs_entry md_suspend_lo
=
3650 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3654 suspend_hi_show(mddev_t
*mddev
, char *page
)
3656 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3660 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3663 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3665 if (mddev
->pers
== NULL
||
3666 mddev
->pers
->quiesce
== NULL
)
3668 if (buf
== e
|| (*e
&& *e
!= '\n'))
3670 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3671 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3672 mddev
->suspend_hi
= new;
3673 mddev
->pers
->quiesce(mddev
, 1);
3674 mddev
->pers
->quiesce(mddev
, 0);
3679 static struct md_sysfs_entry md_suspend_hi
=
3680 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3683 reshape_position_show(mddev_t
*mddev
, char *page
)
3685 if (mddev
->reshape_position
!= MaxSector
)
3686 return sprintf(page
, "%llu\n",
3687 (unsigned long long)mddev
->reshape_position
);
3688 strcpy(page
, "none\n");
3693 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3696 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3699 if (buf
== e
|| (*e
&& *e
!= '\n'))
3701 mddev
->reshape_position
= new;
3702 mddev
->delta_disks
= 0;
3703 mddev
->new_level
= mddev
->level
;
3704 mddev
->new_layout
= mddev
->layout
;
3705 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3709 static struct md_sysfs_entry md_reshape_position
=
3710 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3711 reshape_position_store
);
3714 array_size_show(mddev_t
*mddev
, char *page
)
3716 if (mddev
->external_size
)
3717 return sprintf(page
, "%llu\n",
3718 (unsigned long long)mddev
->array_sectors
/2);
3720 return sprintf(page
, "default\n");
3724 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3728 if (strncmp(buf
, "default", 7) == 0) {
3730 sectors
= mddev
->pers
->size(mddev
, 0, 0);
3732 sectors
= mddev
->array_sectors
;
3734 mddev
->external_size
= 0;
3736 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3738 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
3741 mddev
->external_size
= 1;
3744 mddev
->array_sectors
= sectors
;
3745 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
3747 revalidate_disk(mddev
->gendisk
);
3752 static struct md_sysfs_entry md_array_size
=
3753 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
3756 static struct attribute
*md_default_attrs
[] = {
3759 &md_raid_disks
.attr
,
3760 &md_chunk_size
.attr
,
3762 &md_resync_start
.attr
,
3764 &md_new_device
.attr
,
3765 &md_safe_delay
.attr
,
3766 &md_array_state
.attr
,
3767 &md_reshape_position
.attr
,
3768 &md_array_size
.attr
,
3772 static struct attribute
*md_redundancy_attrs
[] = {
3774 &md_mismatches
.attr
,
3777 &md_sync_speed
.attr
,
3778 &md_sync_force_parallel
.attr
,
3779 &md_sync_completed
.attr
,
3782 &md_suspend_lo
.attr
,
3783 &md_suspend_hi
.attr
,
3788 static struct attribute_group md_redundancy_group
= {
3790 .attrs
= md_redundancy_attrs
,
3795 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3797 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3798 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3803 rv
= mddev_lock(mddev
);
3805 rv
= entry
->show(mddev
, page
);
3806 mddev_unlock(mddev
);
3812 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3813 const char *page
, size_t length
)
3815 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3816 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3821 if (!capable(CAP_SYS_ADMIN
))
3823 rv
= mddev_lock(mddev
);
3824 if (mddev
->hold_active
== UNTIL_IOCTL
)
3825 mddev
->hold_active
= 0;
3827 rv
= entry
->store(mddev
, page
, length
);
3828 mddev_unlock(mddev
);
3833 static void md_free(struct kobject
*ko
)
3835 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3837 if (mddev
->sysfs_state
)
3838 sysfs_put(mddev
->sysfs_state
);
3840 if (mddev
->gendisk
) {
3841 del_gendisk(mddev
->gendisk
);
3842 put_disk(mddev
->gendisk
);
3845 blk_cleanup_queue(mddev
->queue
);
3850 static struct sysfs_ops md_sysfs_ops
= {
3851 .show
= md_attr_show
,
3852 .store
= md_attr_store
,
3854 static struct kobj_type md_ktype
= {
3856 .sysfs_ops
= &md_sysfs_ops
,
3857 .default_attrs
= md_default_attrs
,
3862 static void mddev_delayed_delete(struct work_struct
*ws
)
3864 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
3866 if (mddev
->private == &md_redundancy_group
) {
3867 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3868 if (mddev
->sysfs_action
)
3869 sysfs_put(mddev
->sysfs_action
);
3870 mddev
->sysfs_action
= NULL
;
3871 mddev
->private = NULL
;
3873 kobject_del(&mddev
->kobj
);
3874 kobject_put(&mddev
->kobj
);
3877 static int md_alloc(dev_t dev
, char *name
)
3879 static DEFINE_MUTEX(disks_mutex
);
3880 mddev_t
*mddev
= mddev_find(dev
);
3881 struct gendisk
*disk
;
3890 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
3891 shift
= partitioned
? MdpMinorShift
: 0;
3892 unit
= MINOR(mddev
->unit
) >> shift
;
3894 /* wait for any previous instance if this device
3895 * to be completed removed (mddev_delayed_delete).
3897 flush_scheduled_work();
3899 mutex_lock(&disks_mutex
);
3905 /* Need to ensure that 'name' is not a duplicate.
3908 spin_lock(&all_mddevs_lock
);
3910 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
3911 if (mddev2
->gendisk
&&
3912 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
3913 spin_unlock(&all_mddevs_lock
);
3916 spin_unlock(&all_mddevs_lock
);
3920 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
3923 mddev
->queue
->queuedata
= mddev
;
3925 /* Can be unlocked because the queue is new: no concurrency */
3926 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
3928 blk_queue_make_request(mddev
->queue
, md_make_request
);
3930 disk
= alloc_disk(1 << shift
);
3932 blk_cleanup_queue(mddev
->queue
);
3933 mddev
->queue
= NULL
;
3936 disk
->major
= MAJOR(mddev
->unit
);
3937 disk
->first_minor
= unit
<< shift
;
3939 strcpy(disk
->disk_name
, name
);
3940 else if (partitioned
)
3941 sprintf(disk
->disk_name
, "md_d%d", unit
);
3943 sprintf(disk
->disk_name
, "md%d", unit
);
3944 disk
->fops
= &md_fops
;
3945 disk
->private_data
= mddev
;
3946 disk
->queue
= mddev
->queue
;
3947 /* Allow extended partitions. This makes the
3948 * 'mdp' device redundant, but we can't really
3951 disk
->flags
|= GENHD_FL_EXT_DEVT
;
3953 mddev
->gendisk
= disk
;
3954 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3955 &disk_to_dev(disk
)->kobj
, "%s", "md");
3957 /* This isn't possible, but as kobject_init_and_add is marked
3958 * __must_check, we must do something with the result
3960 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3965 mutex_unlock(&disks_mutex
);
3967 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3968 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
3974 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3976 md_alloc(dev
, NULL
);
3980 static int add_named_array(const char *val
, struct kernel_param
*kp
)
3982 /* val must be "md_*" where * is not all digits.
3983 * We allocate an array with a large free minor number, and
3984 * set the name to val. val must not already be an active name.
3986 int len
= strlen(val
);
3987 char buf
[DISK_NAME_LEN
];
3989 while (len
&& val
[len
-1] == '\n')
3991 if (len
>= DISK_NAME_LEN
)
3993 strlcpy(buf
, val
, len
+1);
3994 if (strncmp(buf
, "md_", 3) != 0)
3996 return md_alloc(0, buf
);
3999 static void md_safemode_timeout(unsigned long data
)
4001 mddev_t
*mddev
= (mddev_t
*) data
;
4003 if (!atomic_read(&mddev
->writes_pending
)) {
4004 mddev
->safemode
= 1;
4005 if (mddev
->external
)
4006 sysfs_notify_dirent(mddev
->sysfs_state
);
4008 md_wakeup_thread(mddev
->thread
);
4011 static int start_dirty_degraded
;
4013 static int do_md_run(mddev_t
* mddev
)
4017 struct gendisk
*disk
;
4018 struct mdk_personality
*pers
;
4020 if (list_empty(&mddev
->disks
))
4021 /* cannot run an array with no devices.. */
4028 * Analyze all RAID superblock(s)
4030 if (!mddev
->raid_disks
) {
4031 if (!mddev
->persistent
)
4036 if (mddev
->level
!= LEVEL_NONE
)
4037 request_module("md-level-%d", mddev
->level
);
4038 else if (mddev
->clevel
[0])
4039 request_module("md-%s", mddev
->clevel
);
4042 * Drop all container device buffers, from now on
4043 * the only valid external interface is through the md
4046 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4047 if (test_bit(Faulty
, &rdev
->flags
))
4049 sync_blockdev(rdev
->bdev
);
4050 invalidate_bdev(rdev
->bdev
);
4052 /* perform some consistency tests on the device.
4053 * We don't want the data to overlap the metadata,
4054 * Internal Bitmap issues have been handled elsewhere.
4056 if (rdev
->data_offset
< rdev
->sb_start
) {
4057 if (mddev
->dev_sectors
&&
4058 rdev
->data_offset
+ mddev
->dev_sectors
4060 printk("md: %s: data overlaps metadata\n",
4065 if (rdev
->sb_start
+ rdev
->sb_size
/512
4066 > rdev
->data_offset
) {
4067 printk("md: %s: metadata overlaps data\n",
4072 sysfs_notify_dirent(rdev
->sysfs_state
);
4075 md_probe(mddev
->unit
, NULL
, NULL
);
4076 disk
= mddev
->gendisk
;
4080 spin_lock(&pers_lock
);
4081 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4082 if (!pers
|| !try_module_get(pers
->owner
)) {
4083 spin_unlock(&pers_lock
);
4084 if (mddev
->level
!= LEVEL_NONE
)
4085 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4088 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4093 spin_unlock(&pers_lock
);
4094 if (mddev
->level
!= pers
->level
) {
4095 mddev
->level
= pers
->level
;
4096 mddev
->new_level
= pers
->level
;
4098 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4100 if (mddev
->reshape_position
!= MaxSector
&&
4101 pers
->start_reshape
== NULL
) {
4102 /* This personality cannot handle reshaping... */
4104 module_put(pers
->owner
);
4108 if (pers
->sync_request
) {
4109 /* Warn if this is a potentially silly
4112 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4116 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4117 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4119 rdev
->bdev
->bd_contains
==
4120 rdev2
->bdev
->bd_contains
) {
4122 "%s: WARNING: %s appears to be"
4123 " on the same physical disk as"
4126 bdevname(rdev
->bdev
,b
),
4127 bdevname(rdev2
->bdev
,b2
));
4134 "True protection against single-disk"
4135 " failure might be compromised.\n");
4138 mddev
->recovery
= 0;
4139 /* may be over-ridden by personality */
4140 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4142 mddev
->barriers_work
= 1;
4143 mddev
->ok_start_degraded
= start_dirty_degraded
;
4146 mddev
->ro
= 2; /* read-only, but switch on first write */
4148 err
= mddev
->pers
->run(mddev
);
4150 printk(KERN_ERR
"md: pers->run() failed ...\n");
4151 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4152 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4153 " but 'external_size' not in effect?\n", __func__
);
4155 "md: invalid array_size %llu > default size %llu\n",
4156 (unsigned long long)mddev
->array_sectors
/ 2,
4157 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4159 mddev
->pers
->stop(mddev
);
4161 if (err
== 0 && mddev
->pers
->sync_request
) {
4162 err
= bitmap_create(mddev
);
4164 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4165 mdname(mddev
), err
);
4166 mddev
->pers
->stop(mddev
);
4170 module_put(mddev
->pers
->owner
);
4172 bitmap_destroy(mddev
);
4175 if (mddev
->pers
->sync_request
) {
4176 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4178 "md: cannot register extra attributes for %s\n",
4180 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4181 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4184 atomic_set(&mddev
->writes_pending
,0);
4185 mddev
->safemode
= 0;
4186 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4187 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4188 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4191 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4192 if (rdev
->raid_disk
>= 0) {
4194 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4195 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4196 printk("md: cannot register %s for %s\n",
4200 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4203 md_update_sb(mddev
, 0);
4205 set_capacity(disk
, mddev
->array_sectors
);
4207 /* If there is a partially-recovered drive we need to
4208 * start recovery here. If we leave it to md_check_recovery,
4209 * it will remove the drives and not do the right thing
4211 if (mddev
->degraded
&& !mddev
->sync_thread
) {
4213 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4214 if (rdev
->raid_disk
>= 0 &&
4215 !test_bit(In_sync
, &rdev
->flags
) &&
4216 !test_bit(Faulty
, &rdev
->flags
))
4217 /* complete an interrupted recovery */
4219 if (spares
&& mddev
->pers
->sync_request
) {
4220 mddev
->recovery
= 0;
4221 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4222 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4225 if (!mddev
->sync_thread
) {
4226 printk(KERN_ERR
"%s: could not start resync"
4229 /* leave the spares where they are, it shouldn't hurt */
4230 mddev
->recovery
= 0;
4234 md_wakeup_thread(mddev
->thread
);
4235 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4237 revalidate_disk(mddev
->gendisk
);
4239 md_new_event(mddev
);
4240 sysfs_notify_dirent(mddev
->sysfs_state
);
4241 if (mddev
->sysfs_action
)
4242 sysfs_notify_dirent(mddev
->sysfs_action
);
4243 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4244 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4248 static int restart_array(mddev_t
*mddev
)
4250 struct gendisk
*disk
= mddev
->gendisk
;
4252 /* Complain if it has no devices */
4253 if (list_empty(&mddev
->disks
))
4259 mddev
->safemode
= 0;
4261 set_disk_ro(disk
, 0);
4262 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4264 /* Kick recovery or resync if necessary */
4265 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4266 md_wakeup_thread(mddev
->thread
);
4267 md_wakeup_thread(mddev
->sync_thread
);
4268 sysfs_notify_dirent(mddev
->sysfs_state
);
4272 /* similar to deny_write_access, but accounts for our holding a reference
4273 * to the file ourselves */
4274 static int deny_bitmap_write_access(struct file
* file
)
4276 struct inode
*inode
= file
->f_mapping
->host
;
4278 spin_lock(&inode
->i_lock
);
4279 if (atomic_read(&inode
->i_writecount
) > 1) {
4280 spin_unlock(&inode
->i_lock
);
4283 atomic_set(&inode
->i_writecount
, -1);
4284 spin_unlock(&inode
->i_lock
);
4289 static void restore_bitmap_write_access(struct file
*file
)
4291 struct inode
*inode
= file
->f_mapping
->host
;
4293 spin_lock(&inode
->i_lock
);
4294 atomic_set(&inode
->i_writecount
, 1);
4295 spin_unlock(&inode
->i_lock
);
4299 * 0 - completely stop and dis-assemble array
4300 * 1 - switch to readonly
4301 * 2 - stop but do not disassemble array
4303 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4306 struct gendisk
*disk
= mddev
->gendisk
;
4309 mutex_lock(&mddev
->open_mutex
);
4310 if (atomic_read(&mddev
->openers
) > is_open
) {
4311 printk("md: %s still in use.\n",mdname(mddev
));
4313 } else if (mddev
->pers
) {
4315 if (mddev
->sync_thread
) {
4316 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4317 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4318 md_unregister_thread(mddev
->sync_thread
);
4319 mddev
->sync_thread
= NULL
;
4322 del_timer_sync(&mddev
->safemode_timer
);
4325 case 1: /* readonly */
4331 case 0: /* disassemble */
4333 bitmap_flush(mddev
);
4334 md_super_wait(mddev
);
4336 set_disk_ro(disk
, 0);
4338 mddev
->pers
->stop(mddev
);
4339 mddev
->queue
->merge_bvec_fn
= NULL
;
4340 mddev
->queue
->unplug_fn
= NULL
;
4341 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4342 module_put(mddev
->pers
->owner
);
4343 if (mddev
->pers
->sync_request
)
4344 mddev
->private = &md_redundancy_group
;
4346 /* tell userspace to handle 'inactive' */
4347 sysfs_notify_dirent(mddev
->sysfs_state
);
4349 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4350 if (rdev
->raid_disk
>= 0) {
4352 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4353 sysfs_remove_link(&mddev
->kobj
, nm
);
4356 set_capacity(disk
, 0);
4362 if (!mddev
->in_sync
|| mddev
->flags
) {
4363 /* mark array as shutdown cleanly */
4365 md_update_sb(mddev
, 1);
4368 set_disk_ro(disk
, 1);
4369 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4373 mutex_unlock(&mddev
->open_mutex
);
4377 * Free resources if final stop
4381 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4383 bitmap_destroy(mddev
);
4384 if (mddev
->bitmap_file
) {
4385 restore_bitmap_write_access(mddev
->bitmap_file
);
4386 fput(mddev
->bitmap_file
);
4387 mddev
->bitmap_file
= NULL
;
4389 mddev
->bitmap_offset
= 0;
4391 /* make sure all md_delayed_delete calls have finished */
4392 flush_scheduled_work();
4394 export_array(mddev
);
4396 mddev
->array_sectors
= 0;
4397 mddev
->external_size
= 0;
4398 mddev
->dev_sectors
= 0;
4399 mddev
->raid_disks
= 0;
4400 mddev
->recovery_cp
= 0;
4401 mddev
->resync_min
= 0;
4402 mddev
->resync_max
= MaxSector
;
4403 mddev
->reshape_position
= MaxSector
;
4404 mddev
->external
= 0;
4405 mddev
->persistent
= 0;
4406 mddev
->level
= LEVEL_NONE
;
4407 mddev
->clevel
[0] = 0;
4410 mddev
->metadata_type
[0] = 0;
4411 mddev
->chunk_sectors
= 0;
4412 mddev
->ctime
= mddev
->utime
= 0;
4414 mddev
->max_disks
= 0;
4416 mddev
->delta_disks
= 0;
4417 mddev
->new_level
= LEVEL_NONE
;
4418 mddev
->new_layout
= 0;
4419 mddev
->new_chunk_sectors
= 0;
4420 mddev
->curr_resync
= 0;
4421 mddev
->resync_mismatches
= 0;
4422 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4423 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4424 mddev
->recovery
= 0;
4427 mddev
->degraded
= 0;
4428 mddev
->barriers_work
= 0;
4429 mddev
->safemode
= 0;
4430 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4431 if (mddev
->hold_active
== UNTIL_STOP
)
4432 mddev
->hold_active
= 0;
4434 } else if (mddev
->pers
)
4435 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
4438 blk_integrity_unregister(disk
);
4439 md_new_event(mddev
);
4440 sysfs_notify_dirent(mddev
->sysfs_state
);
4445 static void autorun_array(mddev_t
*mddev
)
4450 if (list_empty(&mddev
->disks
))
4453 printk(KERN_INFO
"md: running: ");
4455 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4456 char b
[BDEVNAME_SIZE
];
4457 printk("<%s>", bdevname(rdev
->bdev
,b
));
4461 err
= do_md_run(mddev
);
4463 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4464 do_md_stop(mddev
, 0, 0);
4469 * lets try to run arrays based on all disks that have arrived
4470 * until now. (those are in pending_raid_disks)
4472 * the method: pick the first pending disk, collect all disks with
4473 * the same UUID, remove all from the pending list and put them into
4474 * the 'same_array' list. Then order this list based on superblock
4475 * update time (freshest comes first), kick out 'old' disks and
4476 * compare superblocks. If everything's fine then run it.
4478 * If "unit" is allocated, then bump its reference count
4480 static void autorun_devices(int part
)
4482 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4484 char b
[BDEVNAME_SIZE
];
4486 printk(KERN_INFO
"md: autorun ...\n");
4487 while (!list_empty(&pending_raid_disks
)) {
4490 LIST_HEAD(candidates
);
4491 rdev0
= list_entry(pending_raid_disks
.next
,
4492 mdk_rdev_t
, same_set
);
4494 printk(KERN_INFO
"md: considering %s ...\n",
4495 bdevname(rdev0
->bdev
,b
));
4496 INIT_LIST_HEAD(&candidates
);
4497 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4498 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4499 printk(KERN_INFO
"md: adding %s ...\n",
4500 bdevname(rdev
->bdev
,b
));
4501 list_move(&rdev
->same_set
, &candidates
);
4504 * now we have a set of devices, with all of them having
4505 * mostly sane superblocks. It's time to allocate the
4509 dev
= MKDEV(mdp_major
,
4510 rdev0
->preferred_minor
<< MdpMinorShift
);
4511 unit
= MINOR(dev
) >> MdpMinorShift
;
4513 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4516 if (rdev0
->preferred_minor
!= unit
) {
4517 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4518 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4522 md_probe(dev
, NULL
, NULL
);
4523 mddev
= mddev_find(dev
);
4524 if (!mddev
|| !mddev
->gendisk
) {
4528 "md: cannot allocate memory for md drive.\n");
4531 if (mddev_lock(mddev
))
4532 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4534 else if (mddev
->raid_disks
|| mddev
->major_version
4535 || !list_empty(&mddev
->disks
)) {
4537 "md: %s already running, cannot run %s\n",
4538 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4539 mddev_unlock(mddev
);
4541 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4542 mddev
->persistent
= 1;
4543 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4544 list_del_init(&rdev
->same_set
);
4545 if (bind_rdev_to_array(rdev
, mddev
))
4548 autorun_array(mddev
);
4549 mddev_unlock(mddev
);
4551 /* on success, candidates will be empty, on error
4554 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4555 list_del_init(&rdev
->same_set
);
4560 printk(KERN_INFO
"md: ... autorun DONE.\n");
4562 #endif /* !MODULE */
4564 static int get_version(void __user
* arg
)
4568 ver
.major
= MD_MAJOR_VERSION
;
4569 ver
.minor
= MD_MINOR_VERSION
;
4570 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4572 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4578 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4580 mdu_array_info_t info
;
4581 int nr
,working
,active
,failed
,spare
;
4584 nr
=working
=active
=failed
=spare
=0;
4585 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4587 if (test_bit(Faulty
, &rdev
->flags
))
4591 if (test_bit(In_sync
, &rdev
->flags
))
4598 info
.major_version
= mddev
->major_version
;
4599 info
.minor_version
= mddev
->minor_version
;
4600 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4601 info
.ctime
= mddev
->ctime
;
4602 info
.level
= mddev
->level
;
4603 info
.size
= mddev
->dev_sectors
/ 2;
4604 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4607 info
.raid_disks
= mddev
->raid_disks
;
4608 info
.md_minor
= mddev
->md_minor
;
4609 info
.not_persistent
= !mddev
->persistent
;
4611 info
.utime
= mddev
->utime
;
4614 info
.state
= (1<<MD_SB_CLEAN
);
4615 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4616 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4617 info
.active_disks
= active
;
4618 info
.working_disks
= working
;
4619 info
.failed_disks
= failed
;
4620 info
.spare_disks
= spare
;
4622 info
.layout
= mddev
->layout
;
4623 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
4625 if (copy_to_user(arg
, &info
, sizeof(info
)))
4631 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4633 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4634 char *ptr
, *buf
= NULL
;
4637 if (md_allow_write(mddev
))
4638 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4640 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4645 /* bitmap disabled, zero the first byte and copy out */
4646 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4647 file
->pathname
[0] = '\0';
4651 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4655 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4659 strcpy(file
->pathname
, ptr
);
4663 if (copy_to_user(arg
, file
, sizeof(*file
)))
4671 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4673 mdu_disk_info_t info
;
4676 if (copy_from_user(&info
, arg
, sizeof(info
)))
4679 rdev
= find_rdev_nr(mddev
, info
.number
);
4681 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4682 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4683 info
.raid_disk
= rdev
->raid_disk
;
4685 if (test_bit(Faulty
, &rdev
->flags
))
4686 info
.state
|= (1<<MD_DISK_FAULTY
);
4687 else if (test_bit(In_sync
, &rdev
->flags
)) {
4688 info
.state
|= (1<<MD_DISK_ACTIVE
);
4689 info
.state
|= (1<<MD_DISK_SYNC
);
4691 if (test_bit(WriteMostly
, &rdev
->flags
))
4692 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4694 info
.major
= info
.minor
= 0;
4695 info
.raid_disk
= -1;
4696 info
.state
= (1<<MD_DISK_REMOVED
);
4699 if (copy_to_user(arg
, &info
, sizeof(info
)))
4705 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4707 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4709 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4711 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4714 if (!mddev
->raid_disks
) {
4716 /* expecting a device which has a superblock */
4717 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4720 "md: md_import_device returned %ld\n",
4722 return PTR_ERR(rdev
);
4724 if (!list_empty(&mddev
->disks
)) {
4725 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4726 mdk_rdev_t
, same_set
);
4727 int err
= super_types
[mddev
->major_version
]
4728 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4731 "md: %s has different UUID to %s\n",
4732 bdevname(rdev
->bdev
,b
),
4733 bdevname(rdev0
->bdev
,b2
));
4738 err
= bind_rdev_to_array(rdev
, mddev
);
4745 * add_new_disk can be used once the array is assembled
4746 * to add "hot spares". They must already have a superblock
4751 if (!mddev
->pers
->hot_add_disk
) {
4753 "%s: personality does not support diskops!\n",
4757 if (mddev
->persistent
)
4758 rdev
= md_import_device(dev
, mddev
->major_version
,
4759 mddev
->minor_version
);
4761 rdev
= md_import_device(dev
, -1, -1);
4764 "md: md_import_device returned %ld\n",
4766 return PTR_ERR(rdev
);
4768 /* set save_raid_disk if appropriate */
4769 if (!mddev
->persistent
) {
4770 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4771 info
->raid_disk
< mddev
->raid_disks
)
4772 rdev
->raid_disk
= info
->raid_disk
;
4774 rdev
->raid_disk
= -1;
4776 super_types
[mddev
->major_version
].
4777 validate_super(mddev
, rdev
);
4778 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4780 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4781 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4782 set_bit(WriteMostly
, &rdev
->flags
);
4784 clear_bit(WriteMostly
, &rdev
->flags
);
4786 rdev
->raid_disk
= -1;
4787 err
= bind_rdev_to_array(rdev
, mddev
);
4788 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4789 /* If there is hot_add_disk but no hot_remove_disk
4790 * then added disks for geometry changes,
4791 * and should be added immediately.
4793 super_types
[mddev
->major_version
].
4794 validate_super(mddev
, rdev
);
4795 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4797 unbind_rdev_from_array(rdev
);
4802 sysfs_notify_dirent(rdev
->sysfs_state
);
4804 md_update_sb(mddev
, 1);
4805 if (mddev
->degraded
)
4806 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4807 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4808 md_wakeup_thread(mddev
->thread
);
4812 /* otherwise, add_new_disk is only allowed
4813 * for major_version==0 superblocks
4815 if (mddev
->major_version
!= 0) {
4816 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4821 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4823 rdev
= md_import_device(dev
, -1, 0);
4826 "md: error, md_import_device() returned %ld\n",
4828 return PTR_ERR(rdev
);
4830 rdev
->desc_nr
= info
->number
;
4831 if (info
->raid_disk
< mddev
->raid_disks
)
4832 rdev
->raid_disk
= info
->raid_disk
;
4834 rdev
->raid_disk
= -1;
4836 if (rdev
->raid_disk
< mddev
->raid_disks
)
4837 if (info
->state
& (1<<MD_DISK_SYNC
))
4838 set_bit(In_sync
, &rdev
->flags
);
4840 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4841 set_bit(WriteMostly
, &rdev
->flags
);
4843 if (!mddev
->persistent
) {
4844 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4845 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4847 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4848 rdev
->sectors
= rdev
->sb_start
;
4850 err
= bind_rdev_to_array(rdev
, mddev
);
4860 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4862 char b
[BDEVNAME_SIZE
];
4865 rdev
= find_rdev(mddev
, dev
);
4869 if (rdev
->raid_disk
>= 0)
4872 kick_rdev_from_array(rdev
);
4873 md_update_sb(mddev
, 1);
4874 md_new_event(mddev
);
4878 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4879 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4883 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4885 char b
[BDEVNAME_SIZE
];
4892 if (mddev
->major_version
!= 0) {
4893 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4894 " version-0 superblocks.\n",
4898 if (!mddev
->pers
->hot_add_disk
) {
4900 "%s: personality does not support diskops!\n",
4905 rdev
= md_import_device(dev
, -1, 0);
4908 "md: error, md_import_device() returned %ld\n",
4913 if (mddev
->persistent
)
4914 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4916 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4918 rdev
->sectors
= rdev
->sb_start
;
4920 if (test_bit(Faulty
, &rdev
->flags
)) {
4922 "md: can not hot-add faulty %s disk to %s!\n",
4923 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4927 clear_bit(In_sync
, &rdev
->flags
);
4929 rdev
->saved_raid_disk
= -1;
4930 err
= bind_rdev_to_array(rdev
, mddev
);
4935 * The rest should better be atomic, we can have disk failures
4936 * noticed in interrupt contexts ...
4939 rdev
->raid_disk
= -1;
4941 md_update_sb(mddev
, 1);
4944 * Kick recovery, maybe this spare has to be added to the
4945 * array immediately.
4947 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4948 md_wakeup_thread(mddev
->thread
);
4949 md_new_event(mddev
);
4957 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4962 if (!mddev
->pers
->quiesce
)
4964 if (mddev
->recovery
|| mddev
->sync_thread
)
4966 /* we should be able to change the bitmap.. */
4972 return -EEXIST
; /* cannot add when bitmap is present */
4973 mddev
->bitmap_file
= fget(fd
);
4975 if (mddev
->bitmap_file
== NULL
) {
4976 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4981 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4983 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4985 fput(mddev
->bitmap_file
);
4986 mddev
->bitmap_file
= NULL
;
4989 mddev
->bitmap_offset
= 0; /* file overrides offset */
4990 } else if (mddev
->bitmap
== NULL
)
4991 return -ENOENT
; /* cannot remove what isn't there */
4994 mddev
->pers
->quiesce(mddev
, 1);
4996 err
= bitmap_create(mddev
);
4997 if (fd
< 0 || err
) {
4998 bitmap_destroy(mddev
);
4999 fd
= -1; /* make sure to put the file */
5001 mddev
->pers
->quiesce(mddev
, 0);
5004 if (mddev
->bitmap_file
) {
5005 restore_bitmap_write_access(mddev
->bitmap_file
);
5006 fput(mddev
->bitmap_file
);
5008 mddev
->bitmap_file
= NULL
;
5015 * set_array_info is used two different ways
5016 * The original usage is when creating a new array.
5017 * In this usage, raid_disks is > 0 and it together with
5018 * level, size, not_persistent,layout,chunksize determine the
5019 * shape of the array.
5020 * This will always create an array with a type-0.90.0 superblock.
5021 * The newer usage is when assembling an array.
5022 * In this case raid_disks will be 0, and the major_version field is
5023 * use to determine which style super-blocks are to be found on the devices.
5024 * The minor and patch _version numbers are also kept incase the
5025 * super_block handler wishes to interpret them.
5027 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5030 if (info
->raid_disks
== 0) {
5031 /* just setting version number for superblock loading */
5032 if (info
->major_version
< 0 ||
5033 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5034 super_types
[info
->major_version
].name
== NULL
) {
5035 /* maybe try to auto-load a module? */
5037 "md: superblock version %d not known\n",
5038 info
->major_version
);
5041 mddev
->major_version
= info
->major_version
;
5042 mddev
->minor_version
= info
->minor_version
;
5043 mddev
->patch_version
= info
->patch_version
;
5044 mddev
->persistent
= !info
->not_persistent
;
5045 /* ensure mddev_put doesn't delete this now that there
5046 * is some minimal configuration.
5048 mddev
->ctime
= get_seconds();
5051 mddev
->major_version
= MD_MAJOR_VERSION
;
5052 mddev
->minor_version
= MD_MINOR_VERSION
;
5053 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5054 mddev
->ctime
= get_seconds();
5056 mddev
->level
= info
->level
;
5057 mddev
->clevel
[0] = 0;
5058 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5059 mddev
->raid_disks
= info
->raid_disks
;
5060 /* don't set md_minor, it is determined by which /dev/md* was
5063 if (info
->state
& (1<<MD_SB_CLEAN
))
5064 mddev
->recovery_cp
= MaxSector
;
5066 mddev
->recovery_cp
= 0;
5067 mddev
->persistent
= ! info
->not_persistent
;
5068 mddev
->external
= 0;
5070 mddev
->layout
= info
->layout
;
5071 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5073 mddev
->max_disks
= MD_SB_DISKS
;
5075 if (mddev
->persistent
)
5077 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5079 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
5080 mddev
->bitmap_offset
= 0;
5082 mddev
->reshape_position
= MaxSector
;
5085 * Generate a 128 bit UUID
5087 get_random_bytes(mddev
->uuid
, 16);
5089 mddev
->new_level
= mddev
->level
;
5090 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5091 mddev
->new_layout
= mddev
->layout
;
5092 mddev
->delta_disks
= 0;
5097 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5099 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5101 if (mddev
->external_size
)
5104 mddev
->array_sectors
= array_sectors
;
5106 EXPORT_SYMBOL(md_set_array_sectors
);
5108 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5112 int fit
= (num_sectors
== 0);
5114 if (mddev
->pers
->resize
== NULL
)
5116 /* The "num_sectors" is the number of sectors of each device that
5117 * is used. This can only make sense for arrays with redundancy.
5118 * linear and raid0 always use whatever space is available. We can only
5119 * consider changing this number if no resync or reconstruction is
5120 * happening, and if the new size is acceptable. It must fit before the
5121 * sb_start or, if that is <data_offset, it must fit before the size
5122 * of each device. If num_sectors is zero, we find the largest size
5126 if (mddev
->sync_thread
)
5129 /* Sorry, cannot grow a bitmap yet, just remove it,
5133 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5134 sector_t avail
= rdev
->sectors
;
5136 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5137 num_sectors
= avail
;
5138 if (avail
< num_sectors
)
5141 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5143 revalidate_disk(mddev
->gendisk
);
5147 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5150 /* change the number of raid disks */
5151 if (mddev
->pers
->check_reshape
== NULL
)
5153 if (raid_disks
<= 0 ||
5154 raid_disks
>= mddev
->max_disks
)
5156 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5158 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5160 rv
= mddev
->pers
->check_reshape(mddev
);
5166 * update_array_info is used to change the configuration of an
5168 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5169 * fields in the info are checked against the array.
5170 * Any differences that cannot be handled will cause an error.
5171 * Normally, only one change can be managed at a time.
5173 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5179 /* calculate expected state,ignoring low bits */
5180 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
5181 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5183 if (mddev
->major_version
!= info
->major_version
||
5184 mddev
->minor_version
!= info
->minor_version
||
5185 /* mddev->patch_version != info->patch_version || */
5186 mddev
->ctime
!= info
->ctime
||
5187 mddev
->level
!= info
->level
||
5188 /* mddev->layout != info->layout || */
5189 !mddev
->persistent
!= info
->not_persistent
||
5190 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5191 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5192 ((state
^info
->state
) & 0xfffffe00)
5195 /* Check there is only one change */
5196 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5198 if (mddev
->raid_disks
!= info
->raid_disks
)
5200 if (mddev
->layout
!= info
->layout
)
5202 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5209 if (mddev
->layout
!= info
->layout
) {
5211 * we don't need to do anything at the md level, the
5212 * personality will take care of it all.
5214 if (mddev
->pers
->check_reshape
== NULL
)
5217 mddev
->new_layout
= info
->layout
;
5218 rv
= mddev
->pers
->check_reshape(mddev
);
5220 mddev
->new_layout
= mddev
->layout
;
5224 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5225 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5227 if (mddev
->raid_disks
!= info
->raid_disks
)
5228 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5230 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5231 if (mddev
->pers
->quiesce
== NULL
)
5233 if (mddev
->recovery
|| mddev
->sync_thread
)
5235 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5236 /* add the bitmap */
5239 if (mddev
->default_bitmap_offset
== 0)
5241 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
5242 mddev
->pers
->quiesce(mddev
, 1);
5243 rv
= bitmap_create(mddev
);
5245 bitmap_destroy(mddev
);
5246 mddev
->pers
->quiesce(mddev
, 0);
5248 /* remove the bitmap */
5251 if (mddev
->bitmap
->file
)
5253 mddev
->pers
->quiesce(mddev
, 1);
5254 bitmap_destroy(mddev
);
5255 mddev
->pers
->quiesce(mddev
, 0);
5256 mddev
->bitmap_offset
= 0;
5259 md_update_sb(mddev
, 1);
5263 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5267 if (mddev
->pers
== NULL
)
5270 rdev
= find_rdev(mddev
, dev
);
5274 md_error(mddev
, rdev
);
5279 * We have a problem here : there is no easy way to give a CHS
5280 * virtual geometry. We currently pretend that we have a 2 heads
5281 * 4 sectors (with a BIG number of cylinders...). This drives
5282 * dosfs just mad... ;-)
5284 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5286 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5290 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
5294 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5295 unsigned int cmd
, unsigned long arg
)
5298 void __user
*argp
= (void __user
*)arg
;
5299 mddev_t
*mddev
= NULL
;
5301 if (!capable(CAP_SYS_ADMIN
))
5305 * Commands dealing with the RAID driver but not any
5311 err
= get_version(argp
);
5314 case PRINT_RAID_DEBUG
:
5322 autostart_arrays(arg
);
5329 * Commands creating/starting a new array:
5332 mddev
= bdev
->bd_disk
->private_data
;
5339 err
= mddev_lock(mddev
);
5342 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5349 case SET_ARRAY_INFO
:
5351 mdu_array_info_t info
;
5353 memset(&info
, 0, sizeof(info
));
5354 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5359 err
= update_array_info(mddev
, &info
);
5361 printk(KERN_WARNING
"md: couldn't update"
5362 " array info. %d\n", err
);
5367 if (!list_empty(&mddev
->disks
)) {
5369 "md: array %s already has disks!\n",
5374 if (mddev
->raid_disks
) {
5376 "md: array %s already initialised!\n",
5381 err
= set_array_info(mddev
, &info
);
5383 printk(KERN_WARNING
"md: couldn't set"
5384 " array info. %d\n", err
);
5394 * Commands querying/configuring an existing array:
5396 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5397 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5398 if ((!mddev
->raid_disks
&& !mddev
->external
)
5399 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5400 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5401 && cmd
!= GET_BITMAP_FILE
) {
5407 * Commands even a read-only array can execute:
5411 case GET_ARRAY_INFO
:
5412 err
= get_array_info(mddev
, argp
);
5415 case GET_BITMAP_FILE
:
5416 err
= get_bitmap_file(mddev
, argp
);
5420 err
= get_disk_info(mddev
, argp
);
5423 case RESTART_ARRAY_RW
:
5424 err
= restart_array(mddev
);
5428 err
= do_md_stop(mddev
, 0, 1);
5432 err
= do_md_stop(mddev
, 1, 1);
5438 * The remaining ioctls are changing the state of the
5439 * superblock, so we do not allow them on read-only arrays.
5440 * However non-MD ioctls (e.g. get-size) will still come through
5441 * here and hit the 'default' below, so only disallow
5442 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5444 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5445 if (mddev
->ro
== 2) {
5447 sysfs_notify_dirent(mddev
->sysfs_state
);
5448 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5449 md_wakeup_thread(mddev
->thread
);
5460 mdu_disk_info_t info
;
5461 if (copy_from_user(&info
, argp
, sizeof(info
)))
5464 err
= add_new_disk(mddev
, &info
);
5468 case HOT_REMOVE_DISK
:
5469 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5473 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5476 case SET_DISK_FAULTY
:
5477 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5481 err
= do_md_run(mddev
);
5484 case SET_BITMAP_FILE
:
5485 err
= set_bitmap_file(mddev
, (int)arg
);
5495 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5497 mddev
->hold_active
= 0;
5498 mddev_unlock(mddev
);
5508 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5511 * Succeed if we can lock the mddev, which confirms that
5512 * it isn't being stopped right now.
5514 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5517 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5518 /* we are racing with mddev_put which is discarding this
5522 /* Wait until bdev->bd_disk is definitely gone */
5523 flush_scheduled_work();
5524 /* Then retry the open from the top */
5525 return -ERESTARTSYS
;
5527 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5529 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5533 atomic_inc(&mddev
->openers
);
5534 mutex_unlock(&mddev
->open_mutex
);
5536 check_disk_change(bdev
);
5541 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5543 mddev_t
*mddev
= disk
->private_data
;
5546 atomic_dec(&mddev
->openers
);
5552 static int md_media_changed(struct gendisk
*disk
)
5554 mddev_t
*mddev
= disk
->private_data
;
5556 return mddev
->changed
;
5559 static int md_revalidate(struct gendisk
*disk
)
5561 mddev_t
*mddev
= disk
->private_data
;
5566 static struct block_device_operations md_fops
=
5568 .owner
= THIS_MODULE
,
5570 .release
= md_release
,
5572 .getgeo
= md_getgeo
,
5573 .media_changed
= md_media_changed
,
5574 .revalidate_disk
= md_revalidate
,
5577 static int md_thread(void * arg
)
5579 mdk_thread_t
*thread
= arg
;
5582 * md_thread is a 'system-thread', it's priority should be very
5583 * high. We avoid resource deadlocks individually in each
5584 * raid personality. (RAID5 does preallocation) We also use RR and
5585 * the very same RT priority as kswapd, thus we will never get
5586 * into a priority inversion deadlock.
5588 * we definitely have to have equal or higher priority than
5589 * bdflush, otherwise bdflush will deadlock if there are too
5590 * many dirty RAID5 blocks.
5593 allow_signal(SIGKILL
);
5594 while (!kthread_should_stop()) {
5596 /* We need to wait INTERRUPTIBLE so that
5597 * we don't add to the load-average.
5598 * That means we need to be sure no signals are
5601 if (signal_pending(current
))
5602 flush_signals(current
);
5604 wait_event_interruptible_timeout
5606 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5607 || kthread_should_stop(),
5610 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5612 thread
->run(thread
->mddev
);
5618 void md_wakeup_thread(mdk_thread_t
*thread
)
5621 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5622 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5623 wake_up(&thread
->wqueue
);
5627 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5630 mdk_thread_t
*thread
;
5632 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5636 init_waitqueue_head(&thread
->wqueue
);
5639 thread
->mddev
= mddev
;
5640 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5641 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5642 if (IS_ERR(thread
->tsk
)) {
5649 void md_unregister_thread(mdk_thread_t
*thread
)
5653 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5655 kthread_stop(thread
->tsk
);
5659 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5666 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5669 if (mddev
->external
)
5670 set_bit(Blocked
, &rdev
->flags
);
5672 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5674 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5675 __builtin_return_address(0),__builtin_return_address(1),
5676 __builtin_return_address(2),__builtin_return_address(3));
5680 if (!mddev
->pers
->error_handler
)
5682 mddev
->pers
->error_handler(mddev
,rdev
);
5683 if (mddev
->degraded
)
5684 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5685 set_bit(StateChanged
, &rdev
->flags
);
5686 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5687 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5688 md_wakeup_thread(mddev
->thread
);
5689 md_new_event_inintr(mddev
);
5692 /* seq_file implementation /proc/mdstat */
5694 static void status_unused(struct seq_file
*seq
)
5699 seq_printf(seq
, "unused devices: ");
5701 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5702 char b
[BDEVNAME_SIZE
];
5704 seq_printf(seq
, "%s ",
5705 bdevname(rdev
->bdev
,b
));
5708 seq_printf(seq
, "<none>");
5710 seq_printf(seq
, "\n");
5714 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5716 sector_t max_sectors
, resync
, res
;
5717 unsigned long dt
, db
;
5720 unsigned int per_milli
;
5722 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
5724 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5725 max_sectors
= mddev
->resync_max_sectors
;
5727 max_sectors
= mddev
->dev_sectors
;
5730 * Should not happen.
5736 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5737 * in a sector_t, and (max_sectors>>scale) will fit in a
5738 * u32, as those are the requirements for sector_div.
5739 * Thus 'scale' must be at least 10
5742 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5743 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
5746 res
= (resync
>>scale
)*1000;
5747 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
5751 int i
, x
= per_milli
/50, y
= 20-x
;
5752 seq_printf(seq
, "[");
5753 for (i
= 0; i
< x
; i
++)
5754 seq_printf(seq
, "=");
5755 seq_printf(seq
, ">");
5756 for (i
= 0; i
< y
; i
++)
5757 seq_printf(seq
, ".");
5758 seq_printf(seq
, "] ");
5760 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5761 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5763 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5765 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5766 "resync" : "recovery"))),
5767 per_milli
/10, per_milli
% 10,
5768 (unsigned long long) resync
/2,
5769 (unsigned long long) max_sectors
/2);
5772 * dt: time from mark until now
5773 * db: blocks written from mark until now
5774 * rt: remaining time
5776 * rt is a sector_t, so could be 32bit or 64bit.
5777 * So we divide before multiply in case it is 32bit and close
5779 * We scale the divisor (db) by 32 to avoid loosing precision
5780 * near the end of resync when the number of remaining sectors
5782 * We then divide rt by 32 after multiplying by db to compensate.
5783 * The '+1' avoids division by zero if db is very small.
5785 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5787 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5788 - mddev
->resync_mark_cnt
;
5790 rt
= max_sectors
- resync
; /* number of remaining sectors */
5791 sector_div(rt
, db
/32+1);
5795 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
5796 ((unsigned long)rt
% 60)/6);
5798 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5801 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5803 struct list_head
*tmp
;
5813 spin_lock(&all_mddevs_lock
);
5814 list_for_each(tmp
,&all_mddevs
)
5816 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5818 spin_unlock(&all_mddevs_lock
);
5821 spin_unlock(&all_mddevs_lock
);
5823 return (void*)2;/* tail */
5827 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5829 struct list_head
*tmp
;
5830 mddev_t
*next_mddev
, *mddev
= v
;
5836 spin_lock(&all_mddevs_lock
);
5838 tmp
= all_mddevs
.next
;
5840 tmp
= mddev
->all_mddevs
.next
;
5841 if (tmp
!= &all_mddevs
)
5842 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5844 next_mddev
= (void*)2;
5847 spin_unlock(&all_mddevs_lock
);
5855 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5859 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5863 struct mdstat_info
{
5867 static int md_seq_show(struct seq_file
*seq
, void *v
)
5872 struct mdstat_info
*mi
= seq
->private;
5873 struct bitmap
*bitmap
;
5875 if (v
== (void*)1) {
5876 struct mdk_personality
*pers
;
5877 seq_printf(seq
, "Personalities : ");
5878 spin_lock(&pers_lock
);
5879 list_for_each_entry(pers
, &pers_list
, list
)
5880 seq_printf(seq
, "[%s] ", pers
->name
);
5882 spin_unlock(&pers_lock
);
5883 seq_printf(seq
, "\n");
5884 mi
->event
= atomic_read(&md_event_count
);
5887 if (v
== (void*)2) {
5892 if (mddev_lock(mddev
) < 0)
5895 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5896 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5897 mddev
->pers
? "" : "in");
5900 seq_printf(seq
, " (read-only)");
5902 seq_printf(seq
, " (auto-read-only)");
5903 seq_printf(seq
, " %s", mddev
->pers
->name
);
5907 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5908 char b
[BDEVNAME_SIZE
];
5909 seq_printf(seq
, " %s[%d]",
5910 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5911 if (test_bit(WriteMostly
, &rdev
->flags
))
5912 seq_printf(seq
, "(W)");
5913 if (test_bit(Faulty
, &rdev
->flags
)) {
5914 seq_printf(seq
, "(F)");
5916 } else if (rdev
->raid_disk
< 0)
5917 seq_printf(seq
, "(S)"); /* spare */
5918 sectors
+= rdev
->sectors
;
5921 if (!list_empty(&mddev
->disks
)) {
5923 seq_printf(seq
, "\n %llu blocks",
5924 (unsigned long long)
5925 mddev
->array_sectors
/ 2);
5927 seq_printf(seq
, "\n %llu blocks",
5928 (unsigned long long)sectors
/ 2);
5930 if (mddev
->persistent
) {
5931 if (mddev
->major_version
!= 0 ||
5932 mddev
->minor_version
!= 90) {
5933 seq_printf(seq
," super %d.%d",
5934 mddev
->major_version
,
5935 mddev
->minor_version
);
5937 } else if (mddev
->external
)
5938 seq_printf(seq
, " super external:%s",
5939 mddev
->metadata_type
);
5941 seq_printf(seq
, " super non-persistent");
5944 mddev
->pers
->status(seq
, mddev
);
5945 seq_printf(seq
, "\n ");
5946 if (mddev
->pers
->sync_request
) {
5947 if (mddev
->curr_resync
> 2) {
5948 status_resync(seq
, mddev
);
5949 seq_printf(seq
, "\n ");
5950 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5951 seq_printf(seq
, "\tresync=DELAYED\n ");
5952 else if (mddev
->recovery_cp
< MaxSector
)
5953 seq_printf(seq
, "\tresync=PENDING\n ");
5956 seq_printf(seq
, "\n ");
5958 if ((bitmap
= mddev
->bitmap
)) {
5959 unsigned long chunk_kb
;
5960 unsigned long flags
;
5961 spin_lock_irqsave(&bitmap
->lock
, flags
);
5962 chunk_kb
= bitmap
->chunksize
>> 10;
5963 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5965 bitmap
->pages
- bitmap
->missing_pages
,
5967 (bitmap
->pages
- bitmap
->missing_pages
)
5968 << (PAGE_SHIFT
- 10),
5969 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5970 chunk_kb
? "KB" : "B");
5972 seq_printf(seq
, ", file: ");
5973 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5976 seq_printf(seq
, "\n");
5977 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5980 seq_printf(seq
, "\n");
5982 mddev_unlock(mddev
);
5987 static const struct seq_operations md_seq_ops
= {
5988 .start
= md_seq_start
,
5989 .next
= md_seq_next
,
5990 .stop
= md_seq_stop
,
5991 .show
= md_seq_show
,
5994 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5997 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6001 error
= seq_open(file
, &md_seq_ops
);
6005 struct seq_file
*p
= file
->private_data
;
6007 mi
->event
= atomic_read(&md_event_count
);
6012 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6014 struct seq_file
*m
= filp
->private_data
;
6015 struct mdstat_info
*mi
= m
->private;
6018 poll_wait(filp
, &md_event_waiters
, wait
);
6020 /* always allow read */
6021 mask
= POLLIN
| POLLRDNORM
;
6023 if (mi
->event
!= atomic_read(&md_event_count
))
6024 mask
|= POLLERR
| POLLPRI
;
6028 static const struct file_operations md_seq_fops
= {
6029 .owner
= THIS_MODULE
,
6030 .open
= md_seq_open
,
6032 .llseek
= seq_lseek
,
6033 .release
= seq_release_private
,
6034 .poll
= mdstat_poll
,
6037 int register_md_personality(struct mdk_personality
*p
)
6039 spin_lock(&pers_lock
);
6040 list_add_tail(&p
->list
, &pers_list
);
6041 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6042 spin_unlock(&pers_lock
);
6046 int unregister_md_personality(struct mdk_personality
*p
)
6048 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6049 spin_lock(&pers_lock
);
6050 list_del_init(&p
->list
);
6051 spin_unlock(&pers_lock
);
6055 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6063 rdev_for_each_rcu(rdev
, mddev
) {
6064 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6065 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6066 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6067 atomic_read(&disk
->sync_io
);
6068 /* sync IO will cause sync_io to increase before the disk_stats
6069 * as sync_io is counted when a request starts, and
6070 * disk_stats is counted when it completes.
6071 * So resync activity will cause curr_events to be smaller than
6072 * when there was no such activity.
6073 * non-sync IO will cause disk_stat to increase without
6074 * increasing sync_io so curr_events will (eventually)
6075 * be larger than it was before. Once it becomes
6076 * substantially larger, the test below will cause
6077 * the array to appear non-idle, and resync will slow
6079 * If there is a lot of outstanding resync activity when
6080 * we set last_event to curr_events, then all that activity
6081 * completing might cause the array to appear non-idle
6082 * and resync will be slowed down even though there might
6083 * not have been non-resync activity. This will only
6084 * happen once though. 'last_events' will soon reflect
6085 * the state where there is little or no outstanding
6086 * resync requests, and further resync activity will
6087 * always make curr_events less than last_events.
6090 if (init
|| curr_events
- rdev
->last_events
> 64) {
6091 rdev
->last_events
= curr_events
;
6099 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6101 /* another "blocks" (512byte) blocks have been synced */
6102 atomic_sub(blocks
, &mddev
->recovery_active
);
6103 wake_up(&mddev
->recovery_wait
);
6105 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6106 md_wakeup_thread(mddev
->thread
);
6107 // stop recovery, signal do_sync ....
6112 /* md_write_start(mddev, bi)
6113 * If we need to update some array metadata (e.g. 'active' flag
6114 * in superblock) before writing, schedule a superblock update
6115 * and wait for it to complete.
6117 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6120 if (bio_data_dir(bi
) != WRITE
)
6123 BUG_ON(mddev
->ro
== 1);
6124 if (mddev
->ro
== 2) {
6125 /* need to switch to read/write */
6127 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6128 md_wakeup_thread(mddev
->thread
);
6129 md_wakeup_thread(mddev
->sync_thread
);
6132 atomic_inc(&mddev
->writes_pending
);
6133 if (mddev
->safemode
== 1)
6134 mddev
->safemode
= 0;
6135 if (mddev
->in_sync
) {
6136 spin_lock_irq(&mddev
->write_lock
);
6137 if (mddev
->in_sync
) {
6139 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6140 md_wakeup_thread(mddev
->thread
);
6143 spin_unlock_irq(&mddev
->write_lock
);
6146 sysfs_notify_dirent(mddev
->sysfs_state
);
6147 wait_event(mddev
->sb_wait
,
6148 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
6149 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6152 void md_write_end(mddev_t
*mddev
)
6154 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6155 if (mddev
->safemode
== 2)
6156 md_wakeup_thread(mddev
->thread
);
6157 else if (mddev
->safemode_delay
)
6158 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6162 /* md_allow_write(mddev)
6163 * Calling this ensures that the array is marked 'active' so that writes
6164 * may proceed without blocking. It is important to call this before
6165 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6166 * Must be called with mddev_lock held.
6168 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6169 * is dropped, so return -EAGAIN after notifying userspace.
6171 int md_allow_write(mddev_t
*mddev
)
6177 if (!mddev
->pers
->sync_request
)
6180 spin_lock_irq(&mddev
->write_lock
);
6181 if (mddev
->in_sync
) {
6183 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6184 if (mddev
->safemode_delay
&&
6185 mddev
->safemode
== 0)
6186 mddev
->safemode
= 1;
6187 spin_unlock_irq(&mddev
->write_lock
);
6188 md_update_sb(mddev
, 0);
6189 sysfs_notify_dirent(mddev
->sysfs_state
);
6191 spin_unlock_irq(&mddev
->write_lock
);
6193 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
6198 EXPORT_SYMBOL_GPL(md_allow_write
);
6200 #define SYNC_MARKS 10
6201 #define SYNC_MARK_STEP (3*HZ)
6202 void md_do_sync(mddev_t
*mddev
)
6205 unsigned int currspeed
= 0,
6207 sector_t max_sectors
,j
, io_sectors
;
6208 unsigned long mark
[SYNC_MARKS
];
6209 sector_t mark_cnt
[SYNC_MARKS
];
6211 struct list_head
*tmp
;
6212 sector_t last_check
;
6217 /* just incase thread restarts... */
6218 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6220 if (mddev
->ro
) /* never try to sync a read-only array */
6223 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6224 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6225 desc
= "data-check";
6226 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6227 desc
= "requested-resync";
6230 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6235 /* we overload curr_resync somewhat here.
6236 * 0 == not engaged in resync at all
6237 * 2 == checking that there is no conflict with another sync
6238 * 1 == like 2, but have yielded to allow conflicting resync to
6240 * other == active in resync - this many blocks
6242 * Before starting a resync we must have set curr_resync to
6243 * 2, and then checked that every "conflicting" array has curr_resync
6244 * less than ours. When we find one that is the same or higher
6245 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6246 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6247 * This will mean we have to start checking from the beginning again.
6252 mddev
->curr_resync
= 2;
6255 if (kthread_should_stop()) {
6256 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6259 for_each_mddev(mddev2
, tmp
) {
6260 if (mddev2
== mddev
)
6262 if (!mddev
->parallel_resync
6263 && mddev2
->curr_resync
6264 && match_mddev_units(mddev
, mddev2
)) {
6266 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6267 /* arbitrarily yield */
6268 mddev
->curr_resync
= 1;
6269 wake_up(&resync_wait
);
6271 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6272 /* no need to wait here, we can wait the next
6273 * time 'round when curr_resync == 2
6276 /* We need to wait 'interruptible' so as not to
6277 * contribute to the load average, and not to
6278 * be caught by 'softlockup'
6280 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6281 if (!kthread_should_stop() &&
6282 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6283 printk(KERN_INFO
"md: delaying %s of %s"
6284 " until %s has finished (they"
6285 " share one or more physical units)\n",
6286 desc
, mdname(mddev
), mdname(mddev2
));
6288 if (signal_pending(current
))
6289 flush_signals(current
);
6291 finish_wait(&resync_wait
, &wq
);
6294 finish_wait(&resync_wait
, &wq
);
6297 } while (mddev
->curr_resync
< 2);
6300 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6301 /* resync follows the size requested by the personality,
6302 * which defaults to physical size, but can be virtual size
6304 max_sectors
= mddev
->resync_max_sectors
;
6305 mddev
->resync_mismatches
= 0;
6306 /* we don't use the checkpoint if there's a bitmap */
6307 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6308 j
= mddev
->resync_min
;
6309 else if (!mddev
->bitmap
)
6310 j
= mddev
->recovery_cp
;
6312 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6313 max_sectors
= mddev
->dev_sectors
;
6315 /* recovery follows the physical size of devices */
6316 max_sectors
= mddev
->dev_sectors
;
6318 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6319 if (rdev
->raid_disk
>= 0 &&
6320 !test_bit(Faulty
, &rdev
->flags
) &&
6321 !test_bit(In_sync
, &rdev
->flags
) &&
6322 rdev
->recovery_offset
< j
)
6323 j
= rdev
->recovery_offset
;
6326 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6327 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6328 " %d KB/sec/disk.\n", speed_min(mddev
));
6329 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6330 "(but not more than %d KB/sec) for %s.\n",
6331 speed_max(mddev
), desc
);
6333 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6336 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6338 mark_cnt
[m
] = io_sectors
;
6341 mddev
->resync_mark
= mark
[last_mark
];
6342 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6345 * Tune reconstruction:
6347 window
= 32*(PAGE_SIZE
/512);
6348 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6349 window
/2,(unsigned long long) max_sectors
/2);
6351 atomic_set(&mddev
->recovery_active
, 0);
6356 "md: resuming %s of %s from checkpoint.\n",
6357 desc
, mdname(mddev
));
6358 mddev
->curr_resync
= j
;
6361 while (j
< max_sectors
) {
6366 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6367 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6368 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6369 > (max_sectors
>> 4)) ||
6370 (j
- mddev
->curr_resync_completed
)*2
6371 >= mddev
->resync_max
- mddev
->curr_resync_completed
6373 /* time to update curr_resync_completed */
6374 blk_unplug(mddev
->queue
);
6375 wait_event(mddev
->recovery_wait
,
6376 atomic_read(&mddev
->recovery_active
) == 0);
6377 mddev
->curr_resync_completed
=
6379 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6380 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6383 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6384 /* As this condition is controlled by user-space,
6385 * we can block indefinitely, so use '_interruptible'
6386 * to avoid triggering warnings.
6388 flush_signals(current
); /* just in case */
6389 wait_event_interruptible(mddev
->recovery_wait
,
6390 mddev
->resync_max
> j
6391 || kthread_should_stop());
6394 if (kthread_should_stop())
6397 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6398 currspeed
< speed_min(mddev
));
6400 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6404 if (!skipped
) { /* actual IO requested */
6405 io_sectors
+= sectors
;
6406 atomic_add(sectors
, &mddev
->recovery_active
);
6410 if (j
>1) mddev
->curr_resync
= j
;
6411 mddev
->curr_mark_cnt
= io_sectors
;
6412 if (last_check
== 0)
6413 /* this is the earliers that rebuilt will be
6414 * visible in /proc/mdstat
6416 md_new_event(mddev
);
6418 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6421 last_check
= io_sectors
;
6423 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6427 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6429 int next
= (last_mark
+1) % SYNC_MARKS
;
6431 mddev
->resync_mark
= mark
[next
];
6432 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6433 mark
[next
] = jiffies
;
6434 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6439 if (kthread_should_stop())
6444 * this loop exits only if either when we are slower than
6445 * the 'hard' speed limit, or the system was IO-idle for
6447 * the system might be non-idle CPU-wise, but we only care
6448 * about not overloading the IO subsystem. (things like an
6449 * e2fsck being done on the RAID array should execute fast)
6451 blk_unplug(mddev
->queue
);
6454 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6455 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6457 if (currspeed
> speed_min(mddev
)) {
6458 if ((currspeed
> speed_max(mddev
)) ||
6459 !is_mddev_idle(mddev
, 0)) {
6465 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6467 * this also signals 'finished resyncing' to md_stop
6470 blk_unplug(mddev
->queue
);
6472 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6474 /* tell personality that we are finished */
6475 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6477 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6478 mddev
->curr_resync
> 2) {
6479 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6480 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6481 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6483 "md: checkpointing %s of %s.\n",
6484 desc
, mdname(mddev
));
6485 mddev
->recovery_cp
= mddev
->curr_resync
;
6488 mddev
->recovery_cp
= MaxSector
;
6490 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6491 mddev
->curr_resync
= MaxSector
;
6492 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6493 if (rdev
->raid_disk
>= 0 &&
6494 !test_bit(Faulty
, &rdev
->flags
) &&
6495 !test_bit(In_sync
, &rdev
->flags
) &&
6496 rdev
->recovery_offset
< mddev
->curr_resync
)
6497 rdev
->recovery_offset
= mddev
->curr_resync
;
6500 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6503 mddev
->curr_resync
= 0;
6504 mddev
->curr_resync_completed
= 0;
6505 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6506 /* We completed so max setting can be forgotten. */
6507 mddev
->resync_max
= MaxSector
;
6508 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6509 wake_up(&resync_wait
);
6510 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6511 md_wakeup_thread(mddev
->thread
);
6516 * got a signal, exit.
6519 "md: md_do_sync() got signal ... exiting\n");
6520 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6524 EXPORT_SYMBOL_GPL(md_do_sync
);
6527 static int remove_and_add_spares(mddev_t
*mddev
)
6532 mddev
->curr_resync_completed
= 0;
6534 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6535 if (rdev
->raid_disk
>= 0 &&
6536 !test_bit(Blocked
, &rdev
->flags
) &&
6537 (test_bit(Faulty
, &rdev
->flags
) ||
6538 ! test_bit(In_sync
, &rdev
->flags
)) &&
6539 atomic_read(&rdev
->nr_pending
)==0) {
6540 if (mddev
->pers
->hot_remove_disk(
6541 mddev
, rdev
->raid_disk
)==0) {
6543 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6544 sysfs_remove_link(&mddev
->kobj
, nm
);
6545 rdev
->raid_disk
= -1;
6549 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6550 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6551 if (rdev
->raid_disk
>= 0 &&
6552 !test_bit(In_sync
, &rdev
->flags
) &&
6553 !test_bit(Blocked
, &rdev
->flags
))
6555 if (rdev
->raid_disk
< 0
6556 && !test_bit(Faulty
, &rdev
->flags
)) {
6557 rdev
->recovery_offset
= 0;
6559 hot_add_disk(mddev
, rdev
) == 0) {
6561 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6562 if (sysfs_create_link(&mddev
->kobj
,
6565 "md: cannot register "
6569 md_new_event(mddev
);
6578 * This routine is regularly called by all per-raid-array threads to
6579 * deal with generic issues like resync and super-block update.
6580 * Raid personalities that don't have a thread (linear/raid0) do not
6581 * need this as they never do any recovery or update the superblock.
6583 * It does not do any resync itself, but rather "forks" off other threads
6584 * to do that as needed.
6585 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6586 * "->recovery" and create a thread at ->sync_thread.
6587 * When the thread finishes it sets MD_RECOVERY_DONE
6588 * and wakeups up this thread which will reap the thread and finish up.
6589 * This thread also removes any faulty devices (with nr_pending == 0).
6591 * The overall approach is:
6592 * 1/ if the superblock needs updating, update it.
6593 * 2/ If a recovery thread is running, don't do anything else.
6594 * 3/ If recovery has finished, clean up, possibly marking spares active.
6595 * 4/ If there are any faulty devices, remove them.
6596 * 5/ If array is degraded, try to add spares devices
6597 * 6/ If array has spares or is not in-sync, start a resync thread.
6599 void md_check_recovery(mddev_t
*mddev
)
6605 bitmap_daemon_work(mddev
);
6610 if (signal_pending(current
)) {
6611 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6612 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6614 mddev
->safemode
= 2;
6616 flush_signals(current
);
6619 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6622 (mddev
->flags
&& !mddev
->external
) ||
6623 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6624 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6625 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6626 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6627 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6631 if (mddev_trylock(mddev
)) {
6635 /* Only thing we do on a ro array is remove
6638 remove_and_add_spares(mddev
);
6639 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6643 if (!mddev
->external
) {
6645 spin_lock_irq(&mddev
->write_lock
);
6646 if (mddev
->safemode
&&
6647 !atomic_read(&mddev
->writes_pending
) &&
6649 mddev
->recovery_cp
== MaxSector
) {
6652 if (mddev
->persistent
)
6653 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6655 if (mddev
->safemode
== 1)
6656 mddev
->safemode
= 0;
6657 spin_unlock_irq(&mddev
->write_lock
);
6659 sysfs_notify_dirent(mddev
->sysfs_state
);
6663 md_update_sb(mddev
, 0);
6665 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6666 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6667 sysfs_notify_dirent(rdev
->sysfs_state
);
6670 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6671 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6672 /* resync/recovery still happening */
6673 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6676 if (mddev
->sync_thread
) {
6677 /* resync has finished, collect result */
6678 md_unregister_thread(mddev
->sync_thread
);
6679 mddev
->sync_thread
= NULL
;
6680 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6681 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6683 /* activate any spares */
6684 if (mddev
->pers
->spare_active(mddev
))
6685 sysfs_notify(&mddev
->kobj
, NULL
,
6688 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6689 mddev
->pers
->finish_reshape
)
6690 mddev
->pers
->finish_reshape(mddev
);
6691 md_update_sb(mddev
, 1);
6693 /* if array is no-longer degraded, then any saved_raid_disk
6694 * information must be scrapped
6696 if (!mddev
->degraded
)
6697 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6698 rdev
->saved_raid_disk
= -1;
6700 mddev
->recovery
= 0;
6701 /* flag recovery needed just to double check */
6702 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6703 sysfs_notify_dirent(mddev
->sysfs_action
);
6704 md_new_event(mddev
);
6707 /* Set RUNNING before clearing NEEDED to avoid
6708 * any transients in the value of "sync_action".
6710 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6711 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6712 /* Clear some bits that don't mean anything, but
6715 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6716 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6718 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6720 /* no recovery is running.
6721 * remove any failed drives, then
6722 * add spares if possible.
6723 * Spare are also removed and re-added, to allow
6724 * the personality to fail the re-add.
6727 if (mddev
->reshape_position
!= MaxSector
) {
6728 if (mddev
->pers
->check_reshape
== NULL
||
6729 mddev
->pers
->check_reshape(mddev
) != 0)
6730 /* Cannot proceed */
6732 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6733 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6734 } else if ((spares
= remove_and_add_spares(mddev
))) {
6735 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6736 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6737 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6738 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6739 } else if (mddev
->recovery_cp
< MaxSector
) {
6740 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6741 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6742 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6743 /* nothing to be done ... */
6746 if (mddev
->pers
->sync_request
) {
6747 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6748 /* We are adding a device or devices to an array
6749 * which has the bitmap stored on all devices.
6750 * So make sure all bitmap pages get written
6752 bitmap_write_all(mddev
->bitmap
);
6754 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6757 if (!mddev
->sync_thread
) {
6758 printk(KERN_ERR
"%s: could not start resync"
6761 /* leave the spares where they are, it shouldn't hurt */
6762 mddev
->recovery
= 0;
6764 md_wakeup_thread(mddev
->sync_thread
);
6765 sysfs_notify_dirent(mddev
->sysfs_action
);
6766 md_new_event(mddev
);
6769 if (!mddev
->sync_thread
) {
6770 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6771 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6773 if (mddev
->sysfs_action
)
6774 sysfs_notify_dirent(mddev
->sysfs_action
);
6776 mddev_unlock(mddev
);
6780 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6782 sysfs_notify_dirent(rdev
->sysfs_state
);
6783 wait_event_timeout(rdev
->blocked_wait
,
6784 !test_bit(Blocked
, &rdev
->flags
),
6785 msecs_to_jiffies(5000));
6786 rdev_dec_pending(rdev
, mddev
);
6788 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6790 static int md_notify_reboot(struct notifier_block
*this,
6791 unsigned long code
, void *x
)
6793 struct list_head
*tmp
;
6796 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6798 printk(KERN_INFO
"md: stopping all md devices.\n");
6800 for_each_mddev(mddev
, tmp
)
6801 if (mddev_trylock(mddev
)) {
6802 /* Force a switch to readonly even array
6803 * appears to still be in use. Hence
6806 do_md_stop(mddev
, 1, 100);
6807 mddev_unlock(mddev
);
6810 * certain more exotic SCSI devices are known to be
6811 * volatile wrt too early system reboots. While the
6812 * right place to handle this issue is the given
6813 * driver, we do want to have a safe RAID driver ...
6820 static struct notifier_block md_notifier
= {
6821 .notifier_call
= md_notify_reboot
,
6823 .priority
= INT_MAX
, /* before any real devices */
6826 static void md_geninit(void)
6828 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6830 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6833 static int __init
md_init(void)
6835 if (register_blkdev(MD_MAJOR
, "md"))
6837 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6838 unregister_blkdev(MD_MAJOR
, "md");
6841 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6842 md_probe
, NULL
, NULL
);
6843 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6844 md_probe
, NULL
, NULL
);
6846 register_reboot_notifier(&md_notifier
);
6847 raid_table_header
= register_sysctl_table(raid_root_table
);
6857 * Searches all registered partitions for autorun RAID arrays
6861 static LIST_HEAD(all_detected_devices
);
6862 struct detected_devices_node
{
6863 struct list_head list
;
6867 void md_autodetect_dev(dev_t dev
)
6869 struct detected_devices_node
*node_detected_dev
;
6871 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6872 if (node_detected_dev
) {
6873 node_detected_dev
->dev
= dev
;
6874 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6876 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6877 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6882 static void autostart_arrays(int part
)
6885 struct detected_devices_node
*node_detected_dev
;
6887 int i_scanned
, i_passed
;
6892 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6894 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6896 node_detected_dev
= list_entry(all_detected_devices
.next
,
6897 struct detected_devices_node
, list
);
6898 list_del(&node_detected_dev
->list
);
6899 dev
= node_detected_dev
->dev
;
6900 kfree(node_detected_dev
);
6901 rdev
= md_import_device(dev
,0, 90);
6905 if (test_bit(Faulty
, &rdev
->flags
)) {
6909 set_bit(AutoDetected
, &rdev
->flags
);
6910 list_add(&rdev
->same_set
, &pending_raid_disks
);
6914 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6915 i_scanned
, i_passed
);
6917 autorun_devices(part
);
6920 #endif /* !MODULE */
6922 static __exit
void md_exit(void)
6925 struct list_head
*tmp
;
6927 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
6928 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6930 unregister_blkdev(MD_MAJOR
,"md");
6931 unregister_blkdev(mdp_major
, "mdp");
6932 unregister_reboot_notifier(&md_notifier
);
6933 unregister_sysctl_table(raid_table_header
);
6934 remove_proc_entry("mdstat", NULL
);
6935 for_each_mddev(mddev
, tmp
) {
6936 export_array(mddev
);
6937 mddev
->hold_active
= 0;
6941 subsys_initcall(md_init
);
6942 module_exit(md_exit
)
6944 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6946 return sprintf(buffer
, "%d", start_readonly
);
6948 static int set_ro(const char *val
, struct kernel_param
*kp
)
6951 int num
= simple_strtoul(val
, &e
, 10);
6952 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6953 start_readonly
= num
;
6959 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6960 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6962 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
6964 EXPORT_SYMBOL(register_md_personality
);
6965 EXPORT_SYMBOL(unregister_md_personality
);
6966 EXPORT_SYMBOL(md_error
);
6967 EXPORT_SYMBOL(md_done_sync
);
6968 EXPORT_SYMBOL(md_write_start
);
6969 EXPORT_SYMBOL(md_write_end
);
6970 EXPORT_SYMBOL(md_register_thread
);
6971 EXPORT_SYMBOL(md_unregister_thread
);
6972 EXPORT_SYMBOL(md_wakeup_thread
);
6973 EXPORT_SYMBOL(md_check_recovery
);
6974 MODULE_LICENSE("GPL");
6976 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);