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
->hold_active
) {
280 list_del(&mddev
->all_mddevs
);
281 if (mddev
->gendisk
) {
282 /* we did a probe so need to clean up.
283 * Call schedule_work inside the spinlock
284 * so that flush_scheduled_work() after
285 * mddev_find will succeed in waiting for the
288 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
289 schedule_work(&mddev
->del_work
);
293 spin_unlock(&all_mddevs_lock
);
296 static mddev_t
* mddev_find(dev_t unit
)
298 mddev_t
*mddev
, *new = NULL
;
301 spin_lock(&all_mddevs_lock
);
304 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
305 if (mddev
->unit
== unit
) {
307 spin_unlock(&all_mddevs_lock
);
313 list_add(&new->all_mddevs
, &all_mddevs
);
314 spin_unlock(&all_mddevs_lock
);
315 new->hold_active
= UNTIL_IOCTL
;
319 /* find an unused unit number */
320 static int next_minor
= 512;
321 int start
= next_minor
;
325 dev
= MKDEV(MD_MAJOR
, next_minor
);
327 if (next_minor
> MINORMASK
)
329 if (next_minor
== start
) {
330 /* Oh dear, all in use. */
331 spin_unlock(&all_mddevs_lock
);
337 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
338 if (mddev
->unit
== dev
) {
344 new->md_minor
= MINOR(dev
);
345 new->hold_active
= UNTIL_STOP
;
346 list_add(&new->all_mddevs
, &all_mddevs
);
347 spin_unlock(&all_mddevs_lock
);
350 spin_unlock(&all_mddevs_lock
);
352 new = kzalloc(sizeof(*new), GFP_KERNEL
);
357 if (MAJOR(unit
) == MD_MAJOR
)
358 new->md_minor
= MINOR(unit
);
360 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
362 mutex_init(&new->reconfig_mutex
);
363 INIT_LIST_HEAD(&new->disks
);
364 INIT_LIST_HEAD(&new->all_mddevs
);
365 init_timer(&new->safemode_timer
);
366 atomic_set(&new->active
, 1);
367 atomic_set(&new->openers
, 0);
368 atomic_set(&new->active_io
, 0);
369 spin_lock_init(&new->write_lock
);
370 init_waitqueue_head(&new->sb_wait
);
371 init_waitqueue_head(&new->recovery_wait
);
372 new->reshape_position
= MaxSector
;
374 new->resync_max
= MaxSector
;
375 new->level
= LEVEL_NONE
;
380 static inline int mddev_lock(mddev_t
* mddev
)
382 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
385 static inline int mddev_is_locked(mddev_t
*mddev
)
387 return mutex_is_locked(&mddev
->reconfig_mutex
);
390 static inline int mddev_trylock(mddev_t
* mddev
)
392 return mutex_trylock(&mddev
->reconfig_mutex
);
395 static inline void mddev_unlock(mddev_t
* mddev
)
397 mutex_unlock(&mddev
->reconfig_mutex
);
399 md_wakeup_thread(mddev
->thread
);
402 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
406 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
407 if (rdev
->desc_nr
== nr
)
413 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
417 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
418 if (rdev
->bdev
->bd_dev
== dev
)
424 static struct mdk_personality
*find_pers(int level
, char *clevel
)
426 struct mdk_personality
*pers
;
427 list_for_each_entry(pers
, &pers_list
, list
) {
428 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
430 if (strcmp(pers
->name
, clevel
)==0)
436 /* return the offset of the super block in 512byte sectors */
437 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
439 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
440 return MD_NEW_SIZE_SECTORS(num_sectors
);
443 static sector_t
calc_num_sectors(mdk_rdev_t
*rdev
, unsigned chunk_size
)
445 sector_t num_sectors
= rdev
->sb_start
;
448 num_sectors
&= ~((sector_t
)chunk_size
/512 - 1);
452 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
457 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
458 if (!rdev
->sb_page
) {
459 printk(KERN_ALERT
"md: out of memory.\n");
466 static void free_disk_sb(mdk_rdev_t
* rdev
)
469 put_page(rdev
->sb_page
);
471 rdev
->sb_page
= NULL
;
478 static void super_written(struct bio
*bio
, int error
)
480 mdk_rdev_t
*rdev
= bio
->bi_private
;
481 mddev_t
*mddev
= rdev
->mddev
;
483 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
484 printk("md: super_written gets error=%d, uptodate=%d\n",
485 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
486 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
487 md_error(mddev
, rdev
);
490 if (atomic_dec_and_test(&mddev
->pending_writes
))
491 wake_up(&mddev
->sb_wait
);
495 static void super_written_barrier(struct bio
*bio
, int error
)
497 struct bio
*bio2
= bio
->bi_private
;
498 mdk_rdev_t
*rdev
= bio2
->bi_private
;
499 mddev_t
*mddev
= rdev
->mddev
;
501 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
502 error
== -EOPNOTSUPP
) {
504 /* barriers don't appear to be supported :-( */
505 set_bit(BarriersNotsupp
, &rdev
->flags
);
506 mddev
->barriers_work
= 0;
507 spin_lock_irqsave(&mddev
->write_lock
, flags
);
508 bio2
->bi_next
= mddev
->biolist
;
509 mddev
->biolist
= bio2
;
510 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
511 wake_up(&mddev
->sb_wait
);
515 bio
->bi_private
= rdev
;
516 super_written(bio
, error
);
520 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
521 sector_t sector
, int size
, struct page
*page
)
523 /* write first size bytes of page to sector of rdev
524 * Increment mddev->pending_writes before returning
525 * and decrement it on completion, waking up sb_wait
526 * if zero is reached.
527 * If an error occurred, call md_error
529 * As we might need to resubmit the request if BIO_RW_BARRIER
530 * causes ENOTSUPP, we allocate a spare bio...
532 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
533 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNCIO
) | (1<<BIO_RW_UNPLUG
);
535 bio
->bi_bdev
= rdev
->bdev
;
536 bio
->bi_sector
= sector
;
537 bio_add_page(bio
, page
, size
, 0);
538 bio
->bi_private
= rdev
;
539 bio
->bi_end_io
= super_written
;
542 atomic_inc(&mddev
->pending_writes
);
543 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
545 rw
|= (1<<BIO_RW_BARRIER
);
546 rbio
= bio_clone(bio
, GFP_NOIO
);
547 rbio
->bi_private
= bio
;
548 rbio
->bi_end_io
= super_written_barrier
;
549 submit_bio(rw
, rbio
);
554 void md_super_wait(mddev_t
*mddev
)
556 /* wait for all superblock writes that were scheduled to complete.
557 * if any had to be retried (due to BARRIER problems), retry them
561 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
562 if (atomic_read(&mddev
->pending_writes
)==0)
564 while (mddev
->biolist
) {
566 spin_lock_irq(&mddev
->write_lock
);
567 bio
= mddev
->biolist
;
568 mddev
->biolist
= bio
->bi_next
;
570 spin_unlock_irq(&mddev
->write_lock
);
571 submit_bio(bio
->bi_rw
, bio
);
575 finish_wait(&mddev
->sb_wait
, &wq
);
578 static void bi_complete(struct bio
*bio
, int error
)
580 complete((struct completion
*)bio
->bi_private
);
583 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
584 struct page
*page
, int rw
)
586 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
587 struct completion event
;
590 rw
|= (1 << BIO_RW_SYNCIO
) | (1 << BIO_RW_UNPLUG
);
593 bio
->bi_sector
= sector
;
594 bio_add_page(bio
, page
, size
, 0);
595 init_completion(&event
);
596 bio
->bi_private
= &event
;
597 bio
->bi_end_io
= bi_complete
;
599 wait_for_completion(&event
);
601 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
605 EXPORT_SYMBOL_GPL(sync_page_io
);
607 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
609 char b
[BDEVNAME_SIZE
];
610 if (!rdev
->sb_page
) {
618 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
624 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
625 bdevname(rdev
->bdev
,b
));
629 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
631 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
632 sb1
->set_uuid1
== sb2
->set_uuid1
&&
633 sb1
->set_uuid2
== sb2
->set_uuid2
&&
634 sb1
->set_uuid3
== sb2
->set_uuid3
;
637 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
640 mdp_super_t
*tmp1
, *tmp2
;
642 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
643 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
645 if (!tmp1
|| !tmp2
) {
647 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
655 * nr_disks is not constant
660 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
668 static u32
md_csum_fold(u32 csum
)
670 csum
= (csum
& 0xffff) + (csum
>> 16);
671 return (csum
& 0xffff) + (csum
>> 16);
674 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
677 u32
*sb32
= (u32
*)sb
;
679 unsigned int disk_csum
, csum
;
681 disk_csum
= sb
->sb_csum
;
684 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
686 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
690 /* This used to use csum_partial, which was wrong for several
691 * reasons including that different results are returned on
692 * different architectures. It isn't critical that we get exactly
693 * the same return value as before (we always csum_fold before
694 * testing, and that removes any differences). However as we
695 * know that csum_partial always returned a 16bit value on
696 * alphas, do a fold to maximise conformity to previous behaviour.
698 sb
->sb_csum
= md_csum_fold(disk_csum
);
700 sb
->sb_csum
= disk_csum
;
707 * Handle superblock details.
708 * We want to be able to handle multiple superblock formats
709 * so we have a common interface to them all, and an array of
710 * different handlers.
711 * We rely on user-space to write the initial superblock, and support
712 * reading and updating of superblocks.
713 * Interface methods are:
714 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
715 * loads and validates a superblock on dev.
716 * if refdev != NULL, compare superblocks on both devices
718 * 0 - dev has a superblock that is compatible with refdev
719 * 1 - dev has a superblock that is compatible and newer than refdev
720 * so dev should be used as the refdev in future
721 * -EINVAL superblock incompatible or invalid
722 * -othererror e.g. -EIO
724 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
725 * Verify that dev is acceptable into mddev.
726 * The first time, mddev->raid_disks will be 0, and data from
727 * dev should be merged in. Subsequent calls check that dev
728 * is new enough. Return 0 or -EINVAL
730 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
731 * Update the superblock for rdev with data in mddev
732 * This does not write to disc.
738 struct module
*owner
;
739 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
741 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
742 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
743 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
744 sector_t num_sectors
);
748 * load_super for 0.90.0
750 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
752 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
757 * Calculate the position of the superblock (512byte sectors),
758 * it's at the end of the disk.
760 * It also happens to be a multiple of 4Kb.
762 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
764 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
769 bdevname(rdev
->bdev
, b
);
770 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
772 if (sb
->md_magic
!= MD_SB_MAGIC
) {
773 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
778 if (sb
->major_version
!= 0 ||
779 sb
->minor_version
< 90 ||
780 sb
->minor_version
> 91) {
781 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
782 sb
->major_version
, sb
->minor_version
,
787 if (sb
->raid_disks
<= 0)
790 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
791 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
796 rdev
->preferred_minor
= sb
->md_minor
;
797 rdev
->data_offset
= 0;
798 rdev
->sb_size
= MD_SB_BYTES
;
800 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
801 if (sb
->level
!= 1 && sb
->level
!= 4
802 && sb
->level
!= 5 && sb
->level
!= 6
803 && sb
->level
!= 10) {
804 /* FIXME use a better test */
806 "md: bitmaps not supported for this level.\n");
811 if (sb
->level
== LEVEL_MULTIPATH
)
814 rdev
->desc_nr
= sb
->this_disk
.number
;
820 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
821 if (!uuid_equal(refsb
, sb
)) {
822 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
823 b
, bdevname(refdev
->bdev
,b2
));
826 if (!sb_equal(refsb
, sb
)) {
827 printk(KERN_WARNING
"md: %s has same UUID"
828 " but different superblock to %s\n",
829 b
, bdevname(refdev
->bdev
, b2
));
833 ev2
= md_event(refsb
);
839 rdev
->sectors
= calc_num_sectors(rdev
, sb
->chunk_size
);
841 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
842 /* "this cannot possibly happen" ... */
850 * validate_super for 0.90.0
852 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
855 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
856 __u64 ev1
= md_event(sb
);
858 rdev
->raid_disk
= -1;
859 clear_bit(Faulty
, &rdev
->flags
);
860 clear_bit(In_sync
, &rdev
->flags
);
861 clear_bit(WriteMostly
, &rdev
->flags
);
862 clear_bit(BarriersNotsupp
, &rdev
->flags
);
864 if (mddev
->raid_disks
== 0) {
865 mddev
->major_version
= 0;
866 mddev
->minor_version
= sb
->minor_version
;
867 mddev
->patch_version
= sb
->patch_version
;
869 mddev
->chunk_size
= sb
->chunk_size
;
870 mddev
->ctime
= sb
->ctime
;
871 mddev
->utime
= sb
->utime
;
872 mddev
->level
= sb
->level
;
873 mddev
->clevel
[0] = 0;
874 mddev
->layout
= sb
->layout
;
875 mddev
->raid_disks
= sb
->raid_disks
;
876 mddev
->dev_sectors
= sb
->size
* 2;
878 mddev
->bitmap_offset
= 0;
879 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
881 if (mddev
->minor_version
>= 91) {
882 mddev
->reshape_position
= sb
->reshape_position
;
883 mddev
->delta_disks
= sb
->delta_disks
;
884 mddev
->new_level
= sb
->new_level
;
885 mddev
->new_layout
= sb
->new_layout
;
886 mddev
->new_chunk
= sb
->new_chunk
;
888 mddev
->reshape_position
= MaxSector
;
889 mddev
->delta_disks
= 0;
890 mddev
->new_level
= mddev
->level
;
891 mddev
->new_layout
= mddev
->layout
;
892 mddev
->new_chunk
= mddev
->chunk_size
;
895 if (sb
->state
& (1<<MD_SB_CLEAN
))
896 mddev
->recovery_cp
= MaxSector
;
898 if (sb
->events_hi
== sb
->cp_events_hi
&&
899 sb
->events_lo
== sb
->cp_events_lo
) {
900 mddev
->recovery_cp
= sb
->recovery_cp
;
902 mddev
->recovery_cp
= 0;
905 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
906 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
907 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
908 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
910 mddev
->max_disks
= MD_SB_DISKS
;
912 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
913 mddev
->bitmap_file
== NULL
)
914 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
916 } else if (mddev
->pers
== NULL
) {
917 /* Insist on good event counter while assembling */
919 if (ev1
< mddev
->events
)
921 } else if (mddev
->bitmap
) {
922 /* if adding to array with a bitmap, then we can accept an
923 * older device ... but not too old.
925 if (ev1
< mddev
->bitmap
->events_cleared
)
928 if (ev1
< mddev
->events
)
929 /* just a hot-add of a new device, leave raid_disk at -1 */
933 if (mddev
->level
!= LEVEL_MULTIPATH
) {
934 desc
= sb
->disks
+ rdev
->desc_nr
;
936 if (desc
->state
& (1<<MD_DISK_FAULTY
))
937 set_bit(Faulty
, &rdev
->flags
);
938 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
939 desc->raid_disk < mddev->raid_disks */) {
940 set_bit(In_sync
, &rdev
->flags
);
941 rdev
->raid_disk
= desc
->raid_disk
;
943 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
944 set_bit(WriteMostly
, &rdev
->flags
);
945 } else /* MULTIPATH are always insync */
946 set_bit(In_sync
, &rdev
->flags
);
951 * sync_super for 0.90.0
953 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
957 int next_spare
= mddev
->raid_disks
;
960 /* make rdev->sb match mddev data..
963 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
964 * 3/ any empty disks < next_spare become removed
966 * disks[0] gets initialised to REMOVED because
967 * we cannot be sure from other fields if it has
968 * been initialised or not.
971 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
973 rdev
->sb_size
= MD_SB_BYTES
;
975 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
977 memset(sb
, 0, sizeof(*sb
));
979 sb
->md_magic
= MD_SB_MAGIC
;
980 sb
->major_version
= mddev
->major_version
;
981 sb
->patch_version
= mddev
->patch_version
;
982 sb
->gvalid_words
= 0; /* ignored */
983 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
984 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
985 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
986 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
988 sb
->ctime
= mddev
->ctime
;
989 sb
->level
= mddev
->level
;
990 sb
->size
= mddev
->dev_sectors
/ 2;
991 sb
->raid_disks
= mddev
->raid_disks
;
992 sb
->md_minor
= mddev
->md_minor
;
993 sb
->not_persistent
= 0;
994 sb
->utime
= mddev
->utime
;
996 sb
->events_hi
= (mddev
->events
>>32);
997 sb
->events_lo
= (u32
)mddev
->events
;
999 if (mddev
->reshape_position
== MaxSector
)
1000 sb
->minor_version
= 90;
1002 sb
->minor_version
= 91;
1003 sb
->reshape_position
= mddev
->reshape_position
;
1004 sb
->new_level
= mddev
->new_level
;
1005 sb
->delta_disks
= mddev
->delta_disks
;
1006 sb
->new_layout
= mddev
->new_layout
;
1007 sb
->new_chunk
= mddev
->new_chunk
;
1009 mddev
->minor_version
= sb
->minor_version
;
1012 sb
->recovery_cp
= mddev
->recovery_cp
;
1013 sb
->cp_events_hi
= (mddev
->events
>>32);
1014 sb
->cp_events_lo
= (u32
)mddev
->events
;
1015 if (mddev
->recovery_cp
== MaxSector
)
1016 sb
->state
= (1<< MD_SB_CLEAN
);
1018 sb
->recovery_cp
= 0;
1020 sb
->layout
= mddev
->layout
;
1021 sb
->chunk_size
= mddev
->chunk_size
;
1023 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
)
1024 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1026 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1027 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1030 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
1031 && !test_bit(Faulty
, &rdev2
->flags
))
1032 desc_nr
= rdev2
->raid_disk
;
1034 desc_nr
= next_spare
++;
1035 rdev2
->desc_nr
= desc_nr
;
1036 d
= &sb
->disks
[rdev2
->desc_nr
];
1038 d
->number
= rdev2
->desc_nr
;
1039 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1040 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1041 if (rdev2
->raid_disk
>= 0 && test_bit(In_sync
, &rdev2
->flags
)
1042 && !test_bit(Faulty
, &rdev2
->flags
))
1043 d
->raid_disk
= rdev2
->raid_disk
;
1045 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1046 if (test_bit(Faulty
, &rdev2
->flags
))
1047 d
->state
= (1<<MD_DISK_FAULTY
);
1048 else if (test_bit(In_sync
, &rdev2
->flags
)) {
1049 d
->state
= (1<<MD_DISK_ACTIVE
);
1050 d
->state
|= (1<<MD_DISK_SYNC
);
1058 if (test_bit(WriteMostly
, &rdev2
->flags
))
1059 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1061 /* now set the "removed" and "faulty" bits on any missing devices */
1062 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1063 mdp_disk_t
*d
= &sb
->disks
[i
];
1064 if (d
->state
== 0 && d
->number
== 0) {
1067 d
->state
= (1<<MD_DISK_REMOVED
);
1068 d
->state
|= (1<<MD_DISK_FAULTY
);
1072 sb
->nr_disks
= nr_disks
;
1073 sb
->active_disks
= active
;
1074 sb
->working_disks
= working
;
1075 sb
->failed_disks
= failed
;
1076 sb
->spare_disks
= spare
;
1078 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1079 sb
->sb_csum
= calc_sb_csum(sb
);
1083 * rdev_size_change for 0.90.0
1085 static unsigned long long
1086 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1088 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1089 return 0; /* component must fit device */
1090 if (rdev
->mddev
->bitmap_offset
)
1091 return 0; /* can't move bitmap */
1092 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1093 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1094 num_sectors
= rdev
->sb_start
;
1095 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1097 md_super_wait(rdev
->mddev
);
1098 return num_sectors
/ 2; /* kB for sysfs */
1103 * version 1 superblock
1106 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1110 unsigned long long newcsum
;
1111 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1112 __le32
*isuper
= (__le32
*)sb
;
1115 disk_csum
= sb
->sb_csum
;
1118 for (i
=0; size
>=4; size
-= 4 )
1119 newcsum
+= le32_to_cpu(*isuper
++);
1122 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1124 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1125 sb
->sb_csum
= disk_csum
;
1126 return cpu_to_le32(csum
);
1129 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1131 struct mdp_superblock_1
*sb
;
1134 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1138 * Calculate the position of the superblock in 512byte sectors.
1139 * It is always aligned to a 4K boundary and
1140 * depeding on minor_version, it can be:
1141 * 0: At least 8K, but less than 12K, from end of device
1142 * 1: At start of device
1143 * 2: 4K from start of device.
1145 switch(minor_version
) {
1147 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1149 sb_start
&= ~(sector_t
)(4*2-1);
1160 rdev
->sb_start
= sb_start
;
1162 /* superblock is rarely larger than 1K, but it can be larger,
1163 * and it is safe to read 4k, so we do that
1165 ret
= read_disk_sb(rdev
, 4096);
1166 if (ret
) return ret
;
1169 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1171 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1172 sb
->major_version
!= cpu_to_le32(1) ||
1173 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1174 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1175 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1178 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1179 printk("md: invalid superblock checksum on %s\n",
1180 bdevname(rdev
->bdev
,b
));
1183 if (le64_to_cpu(sb
->data_size
) < 10) {
1184 printk("md: data_size too small on %s\n",
1185 bdevname(rdev
->bdev
,b
));
1188 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
)) {
1189 if (sb
->level
!= cpu_to_le32(1) &&
1190 sb
->level
!= cpu_to_le32(4) &&
1191 sb
->level
!= cpu_to_le32(5) &&
1192 sb
->level
!= cpu_to_le32(6) &&
1193 sb
->level
!= cpu_to_le32(10)) {
1195 "md: bitmaps not supported for this level.\n");
1200 rdev
->preferred_minor
= 0xffff;
1201 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1202 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1204 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1205 bmask
= queue_hardsect_size(rdev
->bdev
->bd_disk
->queue
)-1;
1206 if (rdev
->sb_size
& bmask
)
1207 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1210 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1213 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1216 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1222 struct mdp_superblock_1
*refsb
=
1223 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1225 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1226 sb
->level
!= refsb
->level
||
1227 sb
->layout
!= refsb
->layout
||
1228 sb
->chunksize
!= refsb
->chunksize
) {
1229 printk(KERN_WARNING
"md: %s has strangely different"
1230 " superblock to %s\n",
1231 bdevname(rdev
->bdev
,b
),
1232 bdevname(refdev
->bdev
,b2
));
1235 ev1
= le64_to_cpu(sb
->events
);
1236 ev2
= le64_to_cpu(refsb
->events
);
1244 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1245 le64_to_cpu(sb
->data_offset
);
1247 rdev
->sectors
= rdev
->sb_start
;
1248 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1250 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1251 if (le32_to_cpu(sb
->chunksize
))
1252 rdev
->sectors
&= ~((sector_t
)le32_to_cpu(sb
->chunksize
) - 1);
1254 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1259 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1261 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1262 __u64 ev1
= le64_to_cpu(sb
->events
);
1264 rdev
->raid_disk
= -1;
1265 clear_bit(Faulty
, &rdev
->flags
);
1266 clear_bit(In_sync
, &rdev
->flags
);
1267 clear_bit(WriteMostly
, &rdev
->flags
);
1268 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1270 if (mddev
->raid_disks
== 0) {
1271 mddev
->major_version
= 1;
1272 mddev
->patch_version
= 0;
1273 mddev
->external
= 0;
1274 mddev
->chunk_size
= le32_to_cpu(sb
->chunksize
) << 9;
1275 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1276 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1277 mddev
->level
= le32_to_cpu(sb
->level
);
1278 mddev
->clevel
[0] = 0;
1279 mddev
->layout
= le32_to_cpu(sb
->layout
);
1280 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1281 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1282 mddev
->events
= ev1
;
1283 mddev
->bitmap_offset
= 0;
1284 mddev
->default_bitmap_offset
= 1024 >> 9;
1286 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1287 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1289 mddev
->max_disks
= (4096-256)/2;
1291 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1292 mddev
->bitmap_file
== NULL
)
1293 mddev
->bitmap_offset
= (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1295 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1296 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1297 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1298 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1299 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1300 mddev
->new_chunk
= le32_to_cpu(sb
->new_chunk
)<<9;
1302 mddev
->reshape_position
= MaxSector
;
1303 mddev
->delta_disks
= 0;
1304 mddev
->new_level
= mddev
->level
;
1305 mddev
->new_layout
= mddev
->layout
;
1306 mddev
->new_chunk
= mddev
->chunk_size
;
1309 } else if (mddev
->pers
== NULL
) {
1310 /* Insist of good event counter while assembling */
1312 if (ev1
< mddev
->events
)
1314 } else if (mddev
->bitmap
) {
1315 /* If adding to array with a bitmap, then we can accept an
1316 * older device, but not too old.
1318 if (ev1
< mddev
->bitmap
->events_cleared
)
1321 if (ev1
< mddev
->events
)
1322 /* just a hot-add of a new device, leave raid_disk at -1 */
1325 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1327 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1329 case 0xffff: /* spare */
1331 case 0xfffe: /* faulty */
1332 set_bit(Faulty
, &rdev
->flags
);
1335 if ((le32_to_cpu(sb
->feature_map
) &
1336 MD_FEATURE_RECOVERY_OFFSET
))
1337 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1339 set_bit(In_sync
, &rdev
->flags
);
1340 rdev
->raid_disk
= role
;
1343 if (sb
->devflags
& WriteMostly1
)
1344 set_bit(WriteMostly
, &rdev
->flags
);
1345 } else /* MULTIPATH are always insync */
1346 set_bit(In_sync
, &rdev
->flags
);
1351 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1353 struct mdp_superblock_1
*sb
;
1356 /* make rdev->sb match mddev and rdev data. */
1358 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1360 sb
->feature_map
= 0;
1362 sb
->recovery_offset
= cpu_to_le64(0);
1363 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1364 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1365 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1367 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1368 sb
->events
= cpu_to_le64(mddev
->events
);
1370 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1372 sb
->resync_offset
= cpu_to_le64(0);
1374 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1376 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1377 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1379 if (mddev
->bitmap
&& mddev
->bitmap_file
== NULL
) {
1380 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_offset
);
1381 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1384 if (rdev
->raid_disk
>= 0 &&
1385 !test_bit(In_sync
, &rdev
->flags
)) {
1386 if (mddev
->curr_resync_completed
> rdev
->recovery_offset
)
1387 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
1388 if (rdev
->recovery_offset
> 0) {
1390 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1391 sb
->recovery_offset
=
1392 cpu_to_le64(rdev
->recovery_offset
);
1396 if (mddev
->reshape_position
!= MaxSector
) {
1397 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1398 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1399 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1400 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1401 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1402 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk
>>9);
1406 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1407 if (rdev2
->desc_nr
+1 > max_dev
)
1408 max_dev
= rdev2
->desc_nr
+1;
1410 if (max_dev
> le32_to_cpu(sb
->max_dev
))
1411 sb
->max_dev
= cpu_to_le32(max_dev
);
1412 for (i
=0; i
<max_dev
;i
++)
1413 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1415 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1417 if (test_bit(Faulty
, &rdev2
->flags
))
1418 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1419 else if (test_bit(In_sync
, &rdev2
->flags
))
1420 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1421 else if (rdev2
->raid_disk
>= 0 && rdev2
->recovery_offset
> 0)
1422 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1424 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1427 sb
->sb_csum
= calc_sb_1_csum(sb
);
1430 static unsigned long long
1431 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1433 struct mdp_superblock_1
*sb
;
1434 sector_t max_sectors
;
1435 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1436 return 0; /* component must fit device */
1437 if (rdev
->sb_start
< rdev
->data_offset
) {
1438 /* minor versions 1 and 2; superblock before data */
1439 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1440 max_sectors
-= rdev
->data_offset
;
1441 if (!num_sectors
|| num_sectors
> max_sectors
)
1442 num_sectors
= max_sectors
;
1443 } else if (rdev
->mddev
->bitmap_offset
) {
1444 /* minor version 0 with bitmap we can't move */
1447 /* minor version 0; superblock after data */
1449 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1450 sb_start
&= ~(sector_t
)(4*2 - 1);
1451 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1452 if (!num_sectors
|| num_sectors
> max_sectors
)
1453 num_sectors
= max_sectors
;
1454 rdev
->sb_start
= sb_start
;
1456 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1457 sb
->data_size
= cpu_to_le64(num_sectors
);
1458 sb
->super_offset
= rdev
->sb_start
;
1459 sb
->sb_csum
= calc_sb_1_csum(sb
);
1460 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1462 md_super_wait(rdev
->mddev
);
1463 return num_sectors
/ 2; /* kB for sysfs */
1466 static struct super_type super_types
[] = {
1469 .owner
= THIS_MODULE
,
1470 .load_super
= super_90_load
,
1471 .validate_super
= super_90_validate
,
1472 .sync_super
= super_90_sync
,
1473 .rdev_size_change
= super_90_rdev_size_change
,
1477 .owner
= THIS_MODULE
,
1478 .load_super
= super_1_load
,
1479 .validate_super
= super_1_validate
,
1480 .sync_super
= super_1_sync
,
1481 .rdev_size_change
= super_1_rdev_size_change
,
1485 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1487 mdk_rdev_t
*rdev
, *rdev2
;
1490 rdev_for_each_rcu(rdev
, mddev1
)
1491 rdev_for_each_rcu(rdev2
, mddev2
)
1492 if (rdev
->bdev
->bd_contains
==
1493 rdev2
->bdev
->bd_contains
) {
1501 static LIST_HEAD(pending_raid_disks
);
1503 static void md_integrity_check(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1505 struct mdk_personality
*pers
= mddev
->pers
;
1506 struct gendisk
*disk
= mddev
->gendisk
;
1507 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1508 struct blk_integrity
*bi_mddev
= blk_get_integrity(disk
);
1510 /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
1511 if (pers
&& pers
->level
>= 4 && pers
->level
<= 6)
1514 /* If rdev is integrity capable, register profile for mddev */
1515 if (!bi_mddev
&& bi_rdev
) {
1516 if (blk_integrity_register(disk
, bi_rdev
))
1517 printk(KERN_ERR
"%s: %s Could not register integrity!\n",
1518 __func__
, disk
->disk_name
);
1520 printk(KERN_NOTICE
"Enabling data integrity on %s\n",
1525 /* Check that mddev and rdev have matching profiles */
1526 if (blk_integrity_compare(disk
, rdev
->bdev
->bd_disk
) < 0) {
1527 printk(KERN_ERR
"%s: %s/%s integrity mismatch!\n", __func__
,
1528 disk
->disk_name
, rdev
->bdev
->bd_disk
->disk_name
);
1529 printk(KERN_NOTICE
"Disabling data integrity on %s\n",
1531 blk_integrity_unregister(disk
);
1535 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1537 char b
[BDEVNAME_SIZE
];
1547 /* prevent duplicates */
1548 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1551 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1552 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1553 rdev
->sectors
< mddev
->dev_sectors
)) {
1555 /* Cannot change size, so fail
1556 * If mddev->level <= 0, then we don't care
1557 * about aligning sizes (e.g. linear)
1559 if (mddev
->level
> 0)
1562 mddev
->dev_sectors
= rdev
->sectors
;
1565 /* Verify rdev->desc_nr is unique.
1566 * If it is -1, assign a free number, else
1567 * check number is not in use
1569 if (rdev
->desc_nr
< 0) {
1571 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1572 while (find_rdev_nr(mddev
, choice
))
1574 rdev
->desc_nr
= choice
;
1576 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1579 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1580 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1581 mdname(mddev
), mddev
->max_disks
);
1584 bdevname(rdev
->bdev
,b
);
1585 while ( (s
=strchr(b
, '/')) != NULL
)
1588 rdev
->mddev
= mddev
;
1589 printk(KERN_INFO
"md: bind<%s>\n", b
);
1591 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1594 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1595 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1596 kobject_del(&rdev
->kobj
);
1599 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, "state");
1601 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1602 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1604 /* May as well allow recovery to be retried once */
1605 mddev
->recovery_disabled
= 0;
1607 md_integrity_check(rdev
, mddev
);
1611 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1616 static void md_delayed_delete(struct work_struct
*ws
)
1618 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1619 kobject_del(&rdev
->kobj
);
1620 kobject_put(&rdev
->kobj
);
1623 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1625 char b
[BDEVNAME_SIZE
];
1630 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1631 list_del_rcu(&rdev
->same_set
);
1632 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1634 sysfs_remove_link(&rdev
->kobj
, "block");
1635 sysfs_put(rdev
->sysfs_state
);
1636 rdev
->sysfs_state
= NULL
;
1637 /* We need to delay this, otherwise we can deadlock when
1638 * writing to 'remove' to "dev/state". We also need
1639 * to delay it due to rcu usage.
1642 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1643 kobject_get(&rdev
->kobj
);
1644 schedule_work(&rdev
->del_work
);
1648 * prevent the device from being mounted, repartitioned or
1649 * otherwise reused by a RAID array (or any other kernel
1650 * subsystem), by bd_claiming the device.
1652 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1655 struct block_device
*bdev
;
1656 char b
[BDEVNAME_SIZE
];
1658 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1660 printk(KERN_ERR
"md: could not open %s.\n",
1661 __bdevname(dev
, b
));
1662 return PTR_ERR(bdev
);
1664 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1666 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1668 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1672 set_bit(AllReserved
, &rdev
->flags
);
1677 static void unlock_rdev(mdk_rdev_t
*rdev
)
1679 struct block_device
*bdev
= rdev
->bdev
;
1684 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1687 void md_autodetect_dev(dev_t dev
);
1689 static void export_rdev(mdk_rdev_t
* rdev
)
1691 char b
[BDEVNAME_SIZE
];
1692 printk(KERN_INFO
"md: export_rdev(%s)\n",
1693 bdevname(rdev
->bdev
,b
));
1698 if (test_bit(AutoDetected
, &rdev
->flags
))
1699 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1702 kobject_put(&rdev
->kobj
);
1705 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1707 unbind_rdev_from_array(rdev
);
1711 static void export_array(mddev_t
*mddev
)
1713 mdk_rdev_t
*rdev
, *tmp
;
1715 rdev_for_each(rdev
, tmp
, mddev
) {
1720 kick_rdev_from_array(rdev
);
1722 if (!list_empty(&mddev
->disks
))
1724 mddev
->raid_disks
= 0;
1725 mddev
->major_version
= 0;
1728 static void print_desc(mdp_disk_t
*desc
)
1730 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1731 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1734 static void print_sb_90(mdp_super_t
*sb
)
1739 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1740 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1741 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1743 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1744 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1745 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1746 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1747 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1748 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1749 sb
->failed_disks
, sb
->spare_disks
,
1750 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1753 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1756 desc
= sb
->disks
+ i
;
1757 if (desc
->number
|| desc
->major
|| desc
->minor
||
1758 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1759 printk(" D %2d: ", i
);
1763 printk(KERN_INFO
"md: THIS: ");
1764 print_desc(&sb
->this_disk
);
1767 static void print_sb_1(struct mdp_superblock_1
*sb
)
1771 uuid
= sb
->set_uuid
;
1772 printk(KERN_INFO
"md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1773 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1774 KERN_INFO
"md: Name: \"%s\" CT:%llu\n",
1775 le32_to_cpu(sb
->major_version
),
1776 le32_to_cpu(sb
->feature_map
),
1777 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1778 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1779 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1780 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1782 (unsigned long long)le64_to_cpu(sb
->ctime
)
1783 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
1785 uuid
= sb
->device_uuid
;
1786 printk(KERN_INFO
"md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1788 KERN_INFO
"md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1789 ":%02x%02x%02x%02x%02x%02x\n"
1790 KERN_INFO
"md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1791 KERN_INFO
"md: (MaxDev:%u) \n",
1792 le32_to_cpu(sb
->level
),
1793 (unsigned long long)le64_to_cpu(sb
->size
),
1794 le32_to_cpu(sb
->raid_disks
),
1795 le32_to_cpu(sb
->layout
),
1796 le32_to_cpu(sb
->chunksize
),
1797 (unsigned long long)le64_to_cpu(sb
->data_offset
),
1798 (unsigned long long)le64_to_cpu(sb
->data_size
),
1799 (unsigned long long)le64_to_cpu(sb
->super_offset
),
1800 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
1801 le32_to_cpu(sb
->dev_number
),
1802 uuid
[0], uuid
[1], uuid
[2], uuid
[3],
1803 uuid
[4], uuid
[5], uuid
[6], uuid
[7],
1804 uuid
[8], uuid
[9], uuid
[10], uuid
[11],
1805 uuid
[12], uuid
[13], uuid
[14], uuid
[15],
1807 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
1808 (unsigned long long)le64_to_cpu(sb
->events
),
1809 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
1810 le32_to_cpu(sb
->sb_csum
),
1811 le32_to_cpu(sb
->max_dev
)
1815 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
1817 char b
[BDEVNAME_SIZE
];
1818 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1819 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
1820 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
1822 if (rdev
->sb_loaded
) {
1823 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
1824 switch (major_version
) {
1826 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
1829 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
1833 printk(KERN_INFO
"md: no rdev superblock!\n");
1836 static void md_print_devices(void)
1838 struct list_head
*tmp
;
1841 char b
[BDEVNAME_SIZE
];
1844 printk("md: **********************************\n");
1845 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1846 printk("md: **********************************\n");
1847 for_each_mddev(mddev
, tmp
) {
1850 bitmap_print_sb(mddev
->bitmap
);
1852 printk("%s: ", mdname(mddev
));
1853 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1854 printk("<%s>", bdevname(rdev
->bdev
,b
));
1857 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
1858 print_rdev(rdev
, mddev
->major_version
);
1860 printk("md: **********************************\n");
1865 static void sync_sbs(mddev_t
* mddev
, int nospares
)
1867 /* Update each superblock (in-memory image), but
1868 * if we are allowed to, skip spares which already
1869 * have the right event counter, or have one earlier
1870 * (which would mean they aren't being marked as dirty
1871 * with the rest of the array)
1875 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1876 if (rdev
->sb_events
== mddev
->events
||
1878 rdev
->raid_disk
< 0 &&
1879 (rdev
->sb_events
&1)==0 &&
1880 rdev
->sb_events
+1 == mddev
->events
)) {
1881 /* Don't update this superblock */
1882 rdev
->sb_loaded
= 2;
1884 super_types
[mddev
->major_version
].
1885 sync_super(mddev
, rdev
);
1886 rdev
->sb_loaded
= 1;
1891 static void md_update_sb(mddev_t
* mddev
, int force_change
)
1897 if (mddev
->external
)
1900 spin_lock_irq(&mddev
->write_lock
);
1902 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1903 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
1905 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
1906 /* just a clean<-> dirty transition, possibly leave spares alone,
1907 * though if events isn't the right even/odd, we will have to do
1913 if (mddev
->degraded
)
1914 /* If the array is degraded, then skipping spares is both
1915 * dangerous and fairly pointless.
1916 * Dangerous because a device that was removed from the array
1917 * might have a event_count that still looks up-to-date,
1918 * so it can be re-added without a resync.
1919 * Pointless because if there are any spares to skip,
1920 * then a recovery will happen and soon that array won't
1921 * be degraded any more and the spare can go back to sleep then.
1925 sync_req
= mddev
->in_sync
;
1926 mddev
->utime
= get_seconds();
1928 /* If this is just a dirty<->clean transition, and the array is clean
1929 * and 'events' is odd, we can roll back to the previous clean state */
1931 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
1932 && (mddev
->events
& 1)
1933 && mddev
->events
!= 1)
1936 /* otherwise we have to go forward and ... */
1938 if (!mddev
->in_sync
|| mddev
->recovery_cp
!= MaxSector
) { /* not clean */
1939 /* .. if the array isn't clean, insist on an odd 'events' */
1940 if ((mddev
->events
&1)==0) {
1945 /* otherwise insist on an even 'events' (for clean states) */
1946 if ((mddev
->events
&1)) {
1953 if (!mddev
->events
) {
1955 * oops, this 64-bit counter should never wrap.
1956 * Either we are in around ~1 trillion A.C., assuming
1957 * 1 reboot per second, or we have a bug:
1964 * do not write anything to disk if using
1965 * nonpersistent superblocks
1967 if (!mddev
->persistent
) {
1968 if (!mddev
->external
)
1969 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
1971 spin_unlock_irq(&mddev
->write_lock
);
1972 wake_up(&mddev
->sb_wait
);
1975 sync_sbs(mddev
, nospares
);
1976 spin_unlock_irq(&mddev
->write_lock
);
1979 "md: updating %s RAID superblock on device (in sync %d)\n",
1980 mdname(mddev
),mddev
->in_sync
);
1982 bitmap_update_sb(mddev
->bitmap
);
1983 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1984 char b
[BDEVNAME_SIZE
];
1985 dprintk(KERN_INFO
"md: ");
1986 if (rdev
->sb_loaded
!= 1)
1987 continue; /* no noise on spare devices */
1988 if (test_bit(Faulty
, &rdev
->flags
))
1989 dprintk("(skipping faulty ");
1991 dprintk("%s ", bdevname(rdev
->bdev
,b
));
1992 if (!test_bit(Faulty
, &rdev
->flags
)) {
1993 md_super_write(mddev
,rdev
,
1994 rdev
->sb_start
, rdev
->sb_size
,
1996 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
1997 bdevname(rdev
->bdev
,b
),
1998 (unsigned long long)rdev
->sb_start
);
1999 rdev
->sb_events
= mddev
->events
;
2003 if (mddev
->level
== LEVEL_MULTIPATH
)
2004 /* only need to write one superblock... */
2007 md_super_wait(mddev
);
2008 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2010 spin_lock_irq(&mddev
->write_lock
);
2011 if (mddev
->in_sync
!= sync_req
||
2012 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2013 /* have to write it out again */
2014 spin_unlock_irq(&mddev
->write_lock
);
2017 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2018 spin_unlock_irq(&mddev
->write_lock
);
2019 wake_up(&mddev
->sb_wait
);
2023 /* words written to sysfs files may, or may not, be \n terminated.
2024 * We want to accept with case. For this we use cmd_match.
2026 static int cmd_match(const char *cmd
, const char *str
)
2028 /* See if cmd, written into a sysfs file, matches
2029 * str. They must either be the same, or cmd can
2030 * have a trailing newline
2032 while (*cmd
&& *str
&& *cmd
== *str
) {
2043 struct rdev_sysfs_entry
{
2044 struct attribute attr
;
2045 ssize_t (*show
)(mdk_rdev_t
*, char *);
2046 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2050 state_show(mdk_rdev_t
*rdev
, char *page
)
2055 if (test_bit(Faulty
, &rdev
->flags
)) {
2056 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2059 if (test_bit(In_sync
, &rdev
->flags
)) {
2060 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2063 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2064 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2067 if (test_bit(Blocked
, &rdev
->flags
)) {
2068 len
+= sprintf(page
+len
, "%sblocked", sep
);
2071 if (!test_bit(Faulty
, &rdev
->flags
) &&
2072 !test_bit(In_sync
, &rdev
->flags
)) {
2073 len
+= sprintf(page
+len
, "%sspare", sep
);
2076 return len
+sprintf(page
+len
, "\n");
2080 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2083 * faulty - simulates and error
2084 * remove - disconnects the device
2085 * writemostly - sets write_mostly
2086 * -writemostly - clears write_mostly
2087 * blocked - sets the Blocked flag
2088 * -blocked - clears the Blocked flag
2091 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2092 md_error(rdev
->mddev
, rdev
);
2094 } else if (cmd_match(buf
, "remove")) {
2095 if (rdev
->raid_disk
>= 0)
2098 mddev_t
*mddev
= rdev
->mddev
;
2099 kick_rdev_from_array(rdev
);
2101 md_update_sb(mddev
, 1);
2102 md_new_event(mddev
);
2105 } else if (cmd_match(buf
, "writemostly")) {
2106 set_bit(WriteMostly
, &rdev
->flags
);
2108 } else if (cmd_match(buf
, "-writemostly")) {
2109 clear_bit(WriteMostly
, &rdev
->flags
);
2111 } else if (cmd_match(buf
, "blocked")) {
2112 set_bit(Blocked
, &rdev
->flags
);
2114 } else if (cmd_match(buf
, "-blocked")) {
2115 clear_bit(Blocked
, &rdev
->flags
);
2116 wake_up(&rdev
->blocked_wait
);
2117 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2118 md_wakeup_thread(rdev
->mddev
->thread
);
2122 if (!err
&& rdev
->sysfs_state
)
2123 sysfs_notify_dirent(rdev
->sysfs_state
);
2124 return err
? err
: len
;
2126 static struct rdev_sysfs_entry rdev_state
=
2127 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2130 errors_show(mdk_rdev_t
*rdev
, char *page
)
2132 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2136 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2139 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2140 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2141 atomic_set(&rdev
->corrected_errors
, n
);
2146 static struct rdev_sysfs_entry rdev_errors
=
2147 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2150 slot_show(mdk_rdev_t
*rdev
, char *page
)
2152 if (rdev
->raid_disk
< 0)
2153 return sprintf(page
, "none\n");
2155 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2159 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2164 int slot
= simple_strtoul(buf
, &e
, 10);
2165 if (strncmp(buf
, "none", 4)==0)
2167 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2169 if (rdev
->mddev
->pers
&& slot
== -1) {
2170 /* Setting 'slot' on an active array requires also
2171 * updating the 'rd%d' link, and communicating
2172 * with the personality with ->hot_*_disk.
2173 * For now we only support removing
2174 * failed/spare devices. This normally happens automatically,
2175 * but not when the metadata is externally managed.
2177 if (rdev
->raid_disk
== -1)
2179 /* personality does all needed checks */
2180 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2182 err
= rdev
->mddev
->pers
->
2183 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2186 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2187 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2188 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2189 md_wakeup_thread(rdev
->mddev
->thread
);
2190 } else if (rdev
->mddev
->pers
) {
2192 /* Activating a spare .. or possibly reactivating
2193 * if we every get bitmaps working here.
2196 if (rdev
->raid_disk
!= -1)
2199 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2202 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2203 if (rdev2
->raid_disk
== slot
)
2206 rdev
->raid_disk
= slot
;
2207 if (test_bit(In_sync
, &rdev
->flags
))
2208 rdev
->saved_raid_disk
= slot
;
2210 rdev
->saved_raid_disk
= -1;
2211 err
= rdev
->mddev
->pers
->
2212 hot_add_disk(rdev
->mddev
, rdev
);
2214 rdev
->raid_disk
= -1;
2217 sysfs_notify_dirent(rdev
->sysfs_state
);
2218 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2219 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2221 "md: cannot register "
2223 nm
, mdname(rdev
->mddev
));
2225 /* don't wakeup anyone, leave that to userspace. */
2227 if (slot
>= rdev
->mddev
->raid_disks
)
2229 rdev
->raid_disk
= slot
;
2230 /* assume it is working */
2231 clear_bit(Faulty
, &rdev
->flags
);
2232 clear_bit(WriteMostly
, &rdev
->flags
);
2233 set_bit(In_sync
, &rdev
->flags
);
2234 sysfs_notify_dirent(rdev
->sysfs_state
);
2240 static struct rdev_sysfs_entry rdev_slot
=
2241 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2244 offset_show(mdk_rdev_t
*rdev
, char *page
)
2246 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2250 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2253 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2254 if (e
==buf
|| (*e
&& *e
!= '\n'))
2256 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2258 if (rdev
->sectors
&& rdev
->mddev
->external
)
2259 /* Must set offset before size, so overlap checks
2262 rdev
->data_offset
= offset
;
2266 static struct rdev_sysfs_entry rdev_offset
=
2267 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2270 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2272 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2275 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2277 /* check if two start/length pairs overlap */
2285 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2287 unsigned long long blocks
;
2290 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2293 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2294 return -EINVAL
; /* sector conversion overflow */
2297 if (new != blocks
* 2)
2298 return -EINVAL
; /* unsigned long long to sector_t overflow */
2305 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2307 mddev_t
*my_mddev
= rdev
->mddev
;
2308 sector_t oldsectors
= rdev
->sectors
;
2311 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2313 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2314 if (my_mddev
->persistent
) {
2315 sectors
= super_types
[my_mddev
->major_version
].
2316 rdev_size_change(rdev
, sectors
);
2319 } else if (!sectors
)
2320 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2323 if (sectors
< my_mddev
->dev_sectors
)
2324 return -EINVAL
; /* component must fit device */
2326 rdev
->sectors
= sectors
;
2327 if (sectors
> oldsectors
&& my_mddev
->external
) {
2328 /* need to check that all other rdevs with the same ->bdev
2329 * do not overlap. We need to unlock the mddev to avoid
2330 * a deadlock. We have already changed rdev->sectors, and if
2331 * we have to change it back, we will have the lock again.
2335 struct list_head
*tmp
;
2337 mddev_unlock(my_mddev
);
2338 for_each_mddev(mddev
, tmp
) {
2342 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2343 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2344 (rdev
->bdev
== rdev2
->bdev
&&
2346 overlaps(rdev
->data_offset
, rdev
->sectors
,
2352 mddev_unlock(mddev
);
2358 mddev_lock(my_mddev
);
2360 /* Someone else could have slipped in a size
2361 * change here, but doing so is just silly.
2362 * We put oldsectors back because we *know* it is
2363 * safe, and trust userspace not to race with
2366 rdev
->sectors
= oldsectors
;
2373 static struct rdev_sysfs_entry rdev_size
=
2374 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2376 static struct attribute
*rdev_default_attrs
[] = {
2385 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2387 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2388 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2389 mddev_t
*mddev
= rdev
->mddev
;
2395 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2397 if (rdev
->mddev
== NULL
)
2400 rv
= entry
->show(rdev
, page
);
2401 mddev_unlock(mddev
);
2407 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2408 const char *page
, size_t length
)
2410 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2411 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2413 mddev_t
*mddev
= rdev
->mddev
;
2417 if (!capable(CAP_SYS_ADMIN
))
2419 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2421 if (rdev
->mddev
== NULL
)
2424 rv
= entry
->store(rdev
, page
, length
);
2425 mddev_unlock(mddev
);
2430 static void rdev_free(struct kobject
*ko
)
2432 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2435 static struct sysfs_ops rdev_sysfs_ops
= {
2436 .show
= rdev_attr_show
,
2437 .store
= rdev_attr_store
,
2439 static struct kobj_type rdev_ktype
= {
2440 .release
= rdev_free
,
2441 .sysfs_ops
= &rdev_sysfs_ops
,
2442 .default_attrs
= rdev_default_attrs
,
2446 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2448 * mark the device faulty if:
2450 * - the device is nonexistent (zero size)
2451 * - the device has no valid superblock
2453 * a faulty rdev _never_ has rdev->sb set.
2455 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2457 char b
[BDEVNAME_SIZE
];
2462 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2464 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2465 return ERR_PTR(-ENOMEM
);
2468 if ((err
= alloc_disk_sb(rdev
)))
2471 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2475 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2478 rdev
->saved_raid_disk
= -1;
2479 rdev
->raid_disk
= -1;
2481 rdev
->data_offset
= 0;
2482 rdev
->sb_events
= 0;
2483 atomic_set(&rdev
->nr_pending
, 0);
2484 atomic_set(&rdev
->read_errors
, 0);
2485 atomic_set(&rdev
->corrected_errors
, 0);
2487 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2490 "md: %s has zero or unknown size, marking faulty!\n",
2491 bdevname(rdev
->bdev
,b
));
2496 if (super_format
>= 0) {
2497 err
= super_types
[super_format
].
2498 load_super(rdev
, NULL
, super_minor
);
2499 if (err
== -EINVAL
) {
2501 "md: %s does not have a valid v%d.%d "
2502 "superblock, not importing!\n",
2503 bdevname(rdev
->bdev
,b
),
2504 super_format
, super_minor
);
2509 "md: could not read %s's sb, not importing!\n",
2510 bdevname(rdev
->bdev
,b
));
2515 INIT_LIST_HEAD(&rdev
->same_set
);
2516 init_waitqueue_head(&rdev
->blocked_wait
);
2521 if (rdev
->sb_page
) {
2527 return ERR_PTR(err
);
2531 * Check a full RAID array for plausibility
2535 static void analyze_sbs(mddev_t
* mddev
)
2538 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2539 char b
[BDEVNAME_SIZE
];
2542 rdev_for_each(rdev
, tmp
, mddev
)
2543 switch (super_types
[mddev
->major_version
].
2544 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2552 "md: fatal superblock inconsistency in %s"
2553 " -- removing from array\n",
2554 bdevname(rdev
->bdev
,b
));
2555 kick_rdev_from_array(rdev
);
2559 super_types
[mddev
->major_version
].
2560 validate_super(mddev
, freshest
);
2563 rdev_for_each(rdev
, tmp
, mddev
) {
2564 if (rdev
->desc_nr
>= mddev
->max_disks
||
2565 i
> mddev
->max_disks
) {
2567 "md: %s: %s: only %d devices permitted\n",
2568 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2570 kick_rdev_from_array(rdev
);
2573 if (rdev
!= freshest
)
2574 if (super_types
[mddev
->major_version
].
2575 validate_super(mddev
, rdev
)) {
2576 printk(KERN_WARNING
"md: kicking non-fresh %s"
2578 bdevname(rdev
->bdev
,b
));
2579 kick_rdev_from_array(rdev
);
2582 if (mddev
->level
== LEVEL_MULTIPATH
) {
2583 rdev
->desc_nr
= i
++;
2584 rdev
->raid_disk
= rdev
->desc_nr
;
2585 set_bit(In_sync
, &rdev
->flags
);
2586 } else if (rdev
->raid_disk
>= mddev
->raid_disks
) {
2587 rdev
->raid_disk
= -1;
2588 clear_bit(In_sync
, &rdev
->flags
);
2594 if (mddev
->recovery_cp
!= MaxSector
&&
2596 printk(KERN_ERR
"md: %s: raid array is not clean"
2597 " -- starting background reconstruction\n",
2602 static void md_safemode_timeout(unsigned long data
);
2605 safe_delay_show(mddev_t
*mddev
, char *page
)
2607 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2608 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2611 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2619 /* remove a period, and count digits after it */
2620 if (len
>= sizeof(buf
))
2622 strlcpy(buf
, cbuf
, sizeof(buf
));
2623 for (i
=0; i
<len
; i
++) {
2625 if (isdigit(buf
[i
])) {
2630 } else if (buf
[i
] == '.') {
2635 if (strict_strtoul(buf
, 10, &msec
) < 0)
2637 msec
= (msec
* 1000) / scale
;
2639 mddev
->safemode_delay
= 0;
2641 unsigned long old_delay
= mddev
->safemode_delay
;
2642 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2643 if (mddev
->safemode_delay
== 0)
2644 mddev
->safemode_delay
= 1;
2645 if (mddev
->safemode_delay
< old_delay
)
2646 md_safemode_timeout((unsigned long)mddev
);
2650 static struct md_sysfs_entry md_safe_delay
=
2651 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2654 level_show(mddev_t
*mddev
, char *page
)
2656 struct mdk_personality
*p
= mddev
->pers
;
2658 return sprintf(page
, "%s\n", p
->name
);
2659 else if (mddev
->clevel
[0])
2660 return sprintf(page
, "%s\n", mddev
->clevel
);
2661 else if (mddev
->level
!= LEVEL_NONE
)
2662 return sprintf(page
, "%d\n", mddev
->level
);
2668 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2672 struct mdk_personality
*pers
;
2675 if (mddev
->pers
== NULL
) {
2678 if (len
>= sizeof(mddev
->clevel
))
2680 strncpy(mddev
->clevel
, buf
, len
);
2681 if (mddev
->clevel
[len
-1] == '\n')
2683 mddev
->clevel
[len
] = 0;
2684 mddev
->level
= LEVEL_NONE
;
2688 /* request to change the personality. Need to ensure:
2689 * - array is not engaged in resync/recovery/reshape
2690 * - old personality can be suspended
2691 * - new personality will access other array.
2694 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
2697 if (!mddev
->pers
->quiesce
) {
2698 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
2699 mdname(mddev
), mddev
->pers
->name
);
2703 /* Now find the new personality */
2704 if (len
== 0 || len
>= sizeof(level
))
2706 strncpy(level
, buf
, len
);
2707 if (level
[len
-1] == '\n')
2711 request_module("md-%s", level
);
2712 spin_lock(&pers_lock
);
2713 pers
= find_pers(LEVEL_NONE
, level
);
2714 if (!pers
|| !try_module_get(pers
->owner
)) {
2715 spin_unlock(&pers_lock
);
2716 printk(KERN_WARNING
"md: personality %s not loaded\n", level
);
2719 spin_unlock(&pers_lock
);
2721 if (pers
== mddev
->pers
) {
2722 /* Nothing to do! */
2723 module_put(pers
->owner
);
2726 if (!pers
->takeover
) {
2727 module_put(pers
->owner
);
2728 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
2729 mdname(mddev
), level
);
2733 /* ->takeover must set new_* and/or delta_disks
2734 * if it succeeds, and may set them when it fails.
2736 priv
= pers
->takeover(mddev
);
2738 mddev
->new_level
= mddev
->level
;
2739 mddev
->new_layout
= mddev
->layout
;
2740 mddev
->new_chunk
= mddev
->chunk_size
;
2741 mddev
->raid_disks
-= mddev
->delta_disks
;
2742 mddev
->delta_disks
= 0;
2743 module_put(pers
->owner
);
2744 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
2745 mdname(mddev
), level
);
2746 return PTR_ERR(priv
);
2749 /* Looks like we have a winner */
2750 mddev_suspend(mddev
);
2751 mddev
->pers
->stop(mddev
);
2752 module_put(mddev
->pers
->owner
);
2754 mddev
->private = priv
;
2755 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
2756 mddev
->level
= mddev
->new_level
;
2757 mddev
->layout
= mddev
->new_layout
;
2758 mddev
->chunk_size
= mddev
->new_chunk
;
2759 mddev
->delta_disks
= 0;
2761 mddev_resume(mddev
);
2762 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2763 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
2764 md_wakeup_thread(mddev
->thread
);
2768 static struct md_sysfs_entry md_level
=
2769 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
2773 layout_show(mddev_t
*mddev
, char *page
)
2775 /* just a number, not meaningful for all levels */
2776 if (mddev
->reshape_position
!= MaxSector
&&
2777 mddev
->layout
!= mddev
->new_layout
)
2778 return sprintf(page
, "%d (%d)\n",
2779 mddev
->new_layout
, mddev
->layout
);
2780 return sprintf(page
, "%d\n", mddev
->layout
);
2784 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2787 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2789 if (!*buf
|| (*e
&& *e
!= '\n'))
2794 if (mddev
->pers
->reconfig
== NULL
)
2796 err
= mddev
->pers
->reconfig(mddev
, n
, -1);
2800 mddev
->new_layout
= n
;
2801 if (mddev
->reshape_position
== MaxSector
)
2806 static struct md_sysfs_entry md_layout
=
2807 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
2811 raid_disks_show(mddev_t
*mddev
, char *page
)
2813 if (mddev
->raid_disks
== 0)
2815 if (mddev
->reshape_position
!= MaxSector
&&
2816 mddev
->delta_disks
!= 0)
2817 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
2818 mddev
->raid_disks
- mddev
->delta_disks
);
2819 return sprintf(page
, "%d\n", mddev
->raid_disks
);
2822 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
2825 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2829 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2831 if (!*buf
|| (*e
&& *e
!= '\n'))
2835 rv
= update_raid_disks(mddev
, n
);
2836 else if (mddev
->reshape_position
!= MaxSector
) {
2837 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
2838 mddev
->delta_disks
= n
- olddisks
;
2839 mddev
->raid_disks
= n
;
2841 mddev
->raid_disks
= n
;
2842 return rv
? rv
: len
;
2844 static struct md_sysfs_entry md_raid_disks
=
2845 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
2848 chunk_size_show(mddev_t
*mddev
, char *page
)
2850 if (mddev
->reshape_position
!= MaxSector
&&
2851 mddev
->chunk_size
!= mddev
->new_chunk
)
2852 return sprintf(page
, "%d (%d)\n", mddev
->new_chunk
,
2854 return sprintf(page
, "%d\n", mddev
->chunk_size
);
2858 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2861 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2863 if (!*buf
|| (*e
&& *e
!= '\n'))
2868 if (mddev
->pers
->reconfig
== NULL
)
2870 err
= mddev
->pers
->reconfig(mddev
, -1, n
);
2874 mddev
->new_chunk
= n
;
2875 if (mddev
->reshape_position
== MaxSector
)
2876 mddev
->chunk_size
= n
;
2880 static struct md_sysfs_entry md_chunk_size
=
2881 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
2884 resync_start_show(mddev_t
*mddev
, char *page
)
2886 if (mddev
->recovery_cp
== MaxSector
)
2887 return sprintf(page
, "none\n");
2888 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
2892 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2895 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
2899 if (!*buf
|| (*e
&& *e
!= '\n'))
2902 mddev
->recovery_cp
= n
;
2905 static struct md_sysfs_entry md_resync_start
=
2906 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
2909 * The array state can be:
2912 * No devices, no size, no level
2913 * Equivalent to STOP_ARRAY ioctl
2915 * May have some settings, but array is not active
2916 * all IO results in error
2917 * When written, doesn't tear down array, but just stops it
2918 * suspended (not supported yet)
2919 * All IO requests will block. The array can be reconfigured.
2920 * Writing this, if accepted, will block until array is quiescent
2922 * no resync can happen. no superblocks get written.
2923 * write requests fail
2925 * like readonly, but behaves like 'clean' on a write request.
2927 * clean - no pending writes, but otherwise active.
2928 * When written to inactive array, starts without resync
2929 * If a write request arrives then
2930 * if metadata is known, mark 'dirty' and switch to 'active'.
2931 * if not known, block and switch to write-pending
2932 * If written to an active array that has pending writes, then fails.
2934 * fully active: IO and resync can be happening.
2935 * When written to inactive array, starts with resync
2938 * clean, but writes are blocked waiting for 'active' to be written.
2941 * like active, but no writes have been seen for a while (100msec).
2944 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
2945 write_pending
, active_idle
, bad_word
};
2946 static char *array_states
[] = {
2947 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2948 "write-pending", "active-idle", NULL
};
2950 static int match_word(const char *word
, char **list
)
2953 for (n
=0; list
[n
]; n
++)
2954 if (cmd_match(word
, list
[n
]))
2960 array_state_show(mddev_t
*mddev
, char *page
)
2962 enum array_state st
= inactive
;
2975 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2977 else if (mddev
->safemode
)
2983 if (list_empty(&mddev
->disks
) &&
2984 mddev
->raid_disks
== 0 &&
2985 mddev
->dev_sectors
== 0)
2990 return sprintf(page
, "%s\n", array_states
[st
]);
2993 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
2994 static int do_md_run(mddev_t
* mddev
);
2995 static int restart_array(mddev_t
*mddev
);
2998 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3001 enum array_state st
= match_word(buf
, array_states
);
3006 /* stopping an active array */
3007 if (atomic_read(&mddev
->openers
) > 0)
3009 err
= do_md_stop(mddev
, 0, 0);
3012 /* stopping an active array */
3014 if (atomic_read(&mddev
->openers
) > 0)
3016 err
= do_md_stop(mddev
, 2, 0);
3018 err
= 0; /* already inactive */
3021 break; /* not supported yet */
3024 err
= do_md_stop(mddev
, 1, 0);
3027 set_disk_ro(mddev
->gendisk
, 1);
3028 err
= do_md_run(mddev
);
3034 err
= do_md_stop(mddev
, 1, 0);
3035 else if (mddev
->ro
== 1)
3036 err
= restart_array(mddev
);
3039 set_disk_ro(mddev
->gendisk
, 0);
3043 err
= do_md_run(mddev
);
3048 restart_array(mddev
);
3049 spin_lock_irq(&mddev
->write_lock
);
3050 if (atomic_read(&mddev
->writes_pending
) == 0) {
3051 if (mddev
->in_sync
== 0) {
3053 if (mddev
->safemode
== 1)
3054 mddev
->safemode
= 0;
3055 if (mddev
->persistent
)
3056 set_bit(MD_CHANGE_CLEAN
,
3062 spin_unlock_irq(&mddev
->write_lock
);
3065 mddev
->recovery_cp
= MaxSector
;
3066 err
= do_md_run(mddev
);
3071 restart_array(mddev
);
3072 if (mddev
->external
)
3073 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3074 wake_up(&mddev
->sb_wait
);
3078 set_disk_ro(mddev
->gendisk
, 0);
3079 err
= do_md_run(mddev
);
3084 /* these cannot be set */
3090 sysfs_notify_dirent(mddev
->sysfs_state
);
3094 static struct md_sysfs_entry md_array_state
=
3095 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3098 null_show(mddev_t
*mddev
, char *page
)
3104 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3106 /* buf must be %d:%d\n? giving major and minor numbers */
3107 /* The new device is added to the array.
3108 * If the array has a persistent superblock, we read the
3109 * superblock to initialise info and check validity.
3110 * Otherwise, only checking done is that in bind_rdev_to_array,
3111 * which mainly checks size.
3114 int major
= simple_strtoul(buf
, &e
, 10);
3120 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3122 minor
= simple_strtoul(e
+1, &e
, 10);
3123 if (*e
&& *e
!= '\n')
3125 dev
= MKDEV(major
, minor
);
3126 if (major
!= MAJOR(dev
) ||
3127 minor
!= MINOR(dev
))
3131 if (mddev
->persistent
) {
3132 rdev
= md_import_device(dev
, mddev
->major_version
,
3133 mddev
->minor_version
);
3134 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3135 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3136 mdk_rdev_t
, same_set
);
3137 err
= super_types
[mddev
->major_version
]
3138 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3142 } else if (mddev
->external
)
3143 rdev
= md_import_device(dev
, -2, -1);
3145 rdev
= md_import_device(dev
, -1, -1);
3148 return PTR_ERR(rdev
);
3149 err
= bind_rdev_to_array(rdev
, mddev
);
3153 return err
? err
: len
;
3156 static struct md_sysfs_entry md_new_device
=
3157 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3160 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3163 unsigned long chunk
, end_chunk
;
3167 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3169 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3170 if (buf
== end
) break;
3171 if (*end
== '-') { /* range */
3173 end_chunk
= simple_strtoul(buf
, &end
, 0);
3174 if (buf
== end
) break;
3176 if (*end
&& !isspace(*end
)) break;
3177 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3179 while (isspace(*buf
)) buf
++;
3181 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3186 static struct md_sysfs_entry md_bitmap
=
3187 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3190 size_show(mddev_t
*mddev
, char *page
)
3192 return sprintf(page
, "%llu\n",
3193 (unsigned long long)mddev
->dev_sectors
/ 2);
3196 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3199 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3201 /* If array is inactive, we can reduce the component size, but
3202 * not increase it (except from 0).
3203 * If array is active, we can try an on-line resize
3206 int err
= strict_blocks_to_sectors(buf
, §ors
);
3211 err
= update_size(mddev
, sectors
);
3212 md_update_sb(mddev
, 1);
3214 if (mddev
->dev_sectors
== 0 ||
3215 mddev
->dev_sectors
> sectors
)
3216 mddev
->dev_sectors
= sectors
;
3220 return err
? err
: len
;
3223 static struct md_sysfs_entry md_size
=
3224 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3229 * 'none' for arrays with no metadata (good luck...)
3230 * 'external' for arrays with externally managed metadata,
3231 * or N.M for internally known formats
3234 metadata_show(mddev_t
*mddev
, char *page
)
3236 if (mddev
->persistent
)
3237 return sprintf(page
, "%d.%d\n",
3238 mddev
->major_version
, mddev
->minor_version
);
3239 else if (mddev
->external
)
3240 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3242 return sprintf(page
, "none\n");
3246 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3250 /* Changing the details of 'external' metadata is
3251 * always permitted. Otherwise there must be
3252 * no devices attached to the array.
3254 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3256 else if (!list_empty(&mddev
->disks
))
3259 if (cmd_match(buf
, "none")) {
3260 mddev
->persistent
= 0;
3261 mddev
->external
= 0;
3262 mddev
->major_version
= 0;
3263 mddev
->minor_version
= 90;
3266 if (strncmp(buf
, "external:", 9) == 0) {
3267 size_t namelen
= len
-9;
3268 if (namelen
>= sizeof(mddev
->metadata_type
))
3269 namelen
= sizeof(mddev
->metadata_type
)-1;
3270 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3271 mddev
->metadata_type
[namelen
] = 0;
3272 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3273 mddev
->metadata_type
[--namelen
] = 0;
3274 mddev
->persistent
= 0;
3275 mddev
->external
= 1;
3276 mddev
->major_version
= 0;
3277 mddev
->minor_version
= 90;
3280 major
= simple_strtoul(buf
, &e
, 10);
3281 if (e
==buf
|| *e
!= '.')
3284 minor
= simple_strtoul(buf
, &e
, 10);
3285 if (e
==buf
|| (*e
&& *e
!= '\n') )
3287 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3289 mddev
->major_version
= major
;
3290 mddev
->minor_version
= minor
;
3291 mddev
->persistent
= 1;
3292 mddev
->external
= 0;
3296 static struct md_sysfs_entry md_metadata
=
3297 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3300 action_show(mddev_t
*mddev
, char *page
)
3302 char *type
= "idle";
3303 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3304 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3305 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3307 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3308 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3310 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3314 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3317 return sprintf(page
, "%s\n", type
);
3321 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3323 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3326 if (cmd_match(page
, "idle")) {
3327 if (mddev
->sync_thread
) {
3328 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3329 md_unregister_thread(mddev
->sync_thread
);
3330 mddev
->sync_thread
= NULL
;
3331 mddev
->recovery
= 0;
3333 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3334 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3336 else if (cmd_match(page
, "resync"))
3337 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3338 else if (cmd_match(page
, "recover")) {
3339 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3340 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3341 } else if (cmd_match(page
, "reshape")) {
3343 if (mddev
->pers
->start_reshape
== NULL
)
3345 err
= mddev
->pers
->start_reshape(mddev
);
3348 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3350 if (cmd_match(page
, "check"))
3351 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3352 else if (!cmd_match(page
, "repair"))
3354 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3355 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3357 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3358 md_wakeup_thread(mddev
->thread
);
3359 sysfs_notify_dirent(mddev
->sysfs_action
);
3364 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3366 return sprintf(page
, "%llu\n",
3367 (unsigned long long) mddev
->resync_mismatches
);
3370 static struct md_sysfs_entry md_scan_mode
=
3371 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3374 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3377 sync_min_show(mddev_t
*mddev
, char *page
)
3379 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3380 mddev
->sync_speed_min
? "local": "system");
3384 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3388 if (strncmp(buf
, "system", 6)==0) {
3389 mddev
->sync_speed_min
= 0;
3392 min
= simple_strtoul(buf
, &e
, 10);
3393 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3395 mddev
->sync_speed_min
= min
;
3399 static struct md_sysfs_entry md_sync_min
=
3400 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3403 sync_max_show(mddev_t
*mddev
, char *page
)
3405 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3406 mddev
->sync_speed_max
? "local": "system");
3410 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3414 if (strncmp(buf
, "system", 6)==0) {
3415 mddev
->sync_speed_max
= 0;
3418 max
= simple_strtoul(buf
, &e
, 10);
3419 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3421 mddev
->sync_speed_max
= max
;
3425 static struct md_sysfs_entry md_sync_max
=
3426 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3429 degraded_show(mddev_t
*mddev
, char *page
)
3431 return sprintf(page
, "%d\n", mddev
->degraded
);
3433 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3436 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3438 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3442 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3446 if (strict_strtol(buf
, 10, &n
))
3449 if (n
!= 0 && n
!= 1)
3452 mddev
->parallel_resync
= n
;
3454 if (mddev
->sync_thread
)
3455 wake_up(&resync_wait
);
3460 /* force parallel resync, even with shared block devices */
3461 static struct md_sysfs_entry md_sync_force_parallel
=
3462 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3463 sync_force_parallel_show
, sync_force_parallel_store
);
3466 sync_speed_show(mddev_t
*mddev
, char *page
)
3468 unsigned long resync
, dt
, db
;
3469 if (mddev
->curr_resync
== 0)
3470 return sprintf(page
, "none\n");
3471 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3472 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3474 db
= resync
- mddev
->resync_mark_cnt
;
3475 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3478 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3481 sync_completed_show(mddev_t
*mddev
, char *page
)
3483 unsigned long max_sectors
, resync
;
3485 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3486 max_sectors
= mddev
->resync_max_sectors
;
3488 max_sectors
= mddev
->dev_sectors
;
3490 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
));
3491 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3494 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3497 min_sync_show(mddev_t
*mddev
, char *page
)
3499 return sprintf(page
, "%llu\n",
3500 (unsigned long long)mddev
->resync_min
);
3503 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3505 unsigned long long min
;
3506 if (strict_strtoull(buf
, 10, &min
))
3508 if (min
> mddev
->resync_max
)
3510 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3513 /* Must be a multiple of chunk_size */
3514 if (mddev
->chunk_size
) {
3515 if (min
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3518 mddev
->resync_min
= min
;
3523 static struct md_sysfs_entry md_min_sync
=
3524 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3527 max_sync_show(mddev_t
*mddev
, char *page
)
3529 if (mddev
->resync_max
== MaxSector
)
3530 return sprintf(page
, "max\n");
3532 return sprintf(page
, "%llu\n",
3533 (unsigned long long)mddev
->resync_max
);
3536 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3538 if (strncmp(buf
, "max", 3) == 0)
3539 mddev
->resync_max
= MaxSector
;
3541 unsigned long long max
;
3542 if (strict_strtoull(buf
, 10, &max
))
3544 if (max
< mddev
->resync_min
)
3546 if (max
< mddev
->resync_max
&&
3547 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3550 /* Must be a multiple of chunk_size */
3551 if (mddev
->chunk_size
) {
3552 if (max
& (sector_t
)((mddev
->chunk_size
>>9)-1))
3555 mddev
->resync_max
= max
;
3557 wake_up(&mddev
->recovery_wait
);
3561 static struct md_sysfs_entry md_max_sync
=
3562 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3565 suspend_lo_show(mddev_t
*mddev
, char *page
)
3567 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3571 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3574 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3576 if (mddev
->pers
->quiesce
== NULL
)
3578 if (buf
== e
|| (*e
&& *e
!= '\n'))
3580 if (new >= mddev
->suspend_hi
||
3581 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3582 mddev
->suspend_lo
= new;
3583 mddev
->pers
->quiesce(mddev
, 2);
3588 static struct md_sysfs_entry md_suspend_lo
=
3589 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3593 suspend_hi_show(mddev_t
*mddev
, char *page
)
3595 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3599 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3602 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3604 if (mddev
->pers
->quiesce
== NULL
)
3606 if (buf
== e
|| (*e
&& *e
!= '\n'))
3608 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3609 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3610 mddev
->suspend_hi
= new;
3611 mddev
->pers
->quiesce(mddev
, 1);
3612 mddev
->pers
->quiesce(mddev
, 0);
3617 static struct md_sysfs_entry md_suspend_hi
=
3618 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
3621 reshape_position_show(mddev_t
*mddev
, char *page
)
3623 if (mddev
->reshape_position
!= MaxSector
)
3624 return sprintf(page
, "%llu\n",
3625 (unsigned long long)mddev
->reshape_position
);
3626 strcpy(page
, "none\n");
3631 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3634 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3637 if (buf
== e
|| (*e
&& *e
!= '\n'))
3639 mddev
->reshape_position
= new;
3640 mddev
->delta_disks
= 0;
3641 mddev
->new_level
= mddev
->level
;
3642 mddev
->new_layout
= mddev
->layout
;
3643 mddev
->new_chunk
= mddev
->chunk_size
;
3647 static struct md_sysfs_entry md_reshape_position
=
3648 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
3649 reshape_position_store
);
3652 array_size_show(mddev_t
*mddev
, char *page
)
3654 if (mddev
->external_size
)
3655 return sprintf(page
, "%llu\n",
3656 (unsigned long long)mddev
->array_sectors
/2);
3658 return sprintf(page
, "default\n");
3662 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3666 if (strncmp(buf
, "default", 7) == 0) {
3668 sectors
= mddev
->pers
->size(mddev
, 0, 0);
3670 sectors
= mddev
->array_sectors
;
3672 mddev
->external_size
= 0;
3674 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
3676 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
3679 mddev
->external_size
= 1;
3682 mddev
->array_sectors
= sectors
;
3683 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
3685 struct block_device
*bdev
= bdget_disk(mddev
->gendisk
, 0);
3688 mutex_lock(&bdev
->bd_inode
->i_mutex
);
3689 i_size_write(bdev
->bd_inode
,
3690 (loff_t
)mddev
->array_sectors
<< 9);
3691 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
3699 static struct md_sysfs_entry md_array_size
=
3700 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
3703 static struct attribute
*md_default_attrs
[] = {
3706 &md_raid_disks
.attr
,
3707 &md_chunk_size
.attr
,
3709 &md_resync_start
.attr
,
3711 &md_new_device
.attr
,
3712 &md_safe_delay
.attr
,
3713 &md_array_state
.attr
,
3714 &md_reshape_position
.attr
,
3715 &md_array_size
.attr
,
3719 static struct attribute
*md_redundancy_attrs
[] = {
3721 &md_mismatches
.attr
,
3724 &md_sync_speed
.attr
,
3725 &md_sync_force_parallel
.attr
,
3726 &md_sync_completed
.attr
,
3729 &md_suspend_lo
.attr
,
3730 &md_suspend_hi
.attr
,
3735 static struct attribute_group md_redundancy_group
= {
3737 .attrs
= md_redundancy_attrs
,
3742 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3744 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3745 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3750 rv
= mddev_lock(mddev
);
3752 rv
= entry
->show(mddev
, page
);
3753 mddev_unlock(mddev
);
3759 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3760 const char *page
, size_t length
)
3762 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
3763 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
3768 if (!capable(CAP_SYS_ADMIN
))
3770 rv
= mddev_lock(mddev
);
3771 if (mddev
->hold_active
== UNTIL_IOCTL
)
3772 mddev
->hold_active
= 0;
3774 rv
= entry
->store(mddev
, page
, length
);
3775 mddev_unlock(mddev
);
3780 static void md_free(struct kobject
*ko
)
3782 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
3784 if (mddev
->sysfs_state
)
3785 sysfs_put(mddev
->sysfs_state
);
3787 if (mddev
->gendisk
) {
3788 del_gendisk(mddev
->gendisk
);
3789 put_disk(mddev
->gendisk
);
3792 blk_cleanup_queue(mddev
->queue
);
3797 static struct sysfs_ops md_sysfs_ops
= {
3798 .show
= md_attr_show
,
3799 .store
= md_attr_store
,
3801 static struct kobj_type md_ktype
= {
3803 .sysfs_ops
= &md_sysfs_ops
,
3804 .default_attrs
= md_default_attrs
,
3809 static void mddev_delayed_delete(struct work_struct
*ws
)
3811 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
3813 if (mddev
->private == &md_redundancy_group
) {
3814 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
3815 if (mddev
->sysfs_action
)
3816 sysfs_put(mddev
->sysfs_action
);
3817 mddev
->sysfs_action
= NULL
;
3818 mddev
->private = NULL
;
3820 kobject_del(&mddev
->kobj
);
3821 kobject_put(&mddev
->kobj
);
3824 static int md_alloc(dev_t dev
, char *name
)
3826 static DEFINE_MUTEX(disks_mutex
);
3827 mddev_t
*mddev
= mddev_find(dev
);
3828 struct gendisk
*disk
;
3837 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
3838 shift
= partitioned
? MdpMinorShift
: 0;
3839 unit
= MINOR(mddev
->unit
) >> shift
;
3841 /* wait for any previous instance if this device
3842 * to be completed removed (mddev_delayed_delete).
3844 flush_scheduled_work();
3846 mutex_lock(&disks_mutex
);
3847 if (mddev
->gendisk
) {
3848 mutex_unlock(&disks_mutex
);
3854 /* Need to ensure that 'name' is not a duplicate.
3857 spin_lock(&all_mddevs_lock
);
3859 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
3860 if (mddev2
->gendisk
&&
3861 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
3862 spin_unlock(&all_mddevs_lock
);
3865 spin_unlock(&all_mddevs_lock
);
3868 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
3869 if (!mddev
->queue
) {
3870 mutex_unlock(&disks_mutex
);
3874 mddev
->queue
->queuedata
= mddev
;
3876 /* Can be unlocked because the queue is new: no concurrency */
3877 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
3879 blk_queue_make_request(mddev
->queue
, md_make_request
);
3881 disk
= alloc_disk(1 << shift
);
3883 mutex_unlock(&disks_mutex
);
3884 blk_cleanup_queue(mddev
->queue
);
3885 mddev
->queue
= NULL
;
3889 disk
->major
= MAJOR(mddev
->unit
);
3890 disk
->first_minor
= unit
<< shift
;
3892 strcpy(disk
->disk_name
, name
);
3893 else if (partitioned
)
3894 sprintf(disk
->disk_name
, "md_d%d", unit
);
3896 sprintf(disk
->disk_name
, "md%d", unit
);
3897 disk
->fops
= &md_fops
;
3898 disk
->private_data
= mddev
;
3899 disk
->queue
= mddev
->queue
;
3900 /* Allow extended partitions. This makes the
3901 * 'mdp' device redundant, but we can't really
3904 disk
->flags
|= GENHD_FL_EXT_DEVT
;
3906 mddev
->gendisk
= disk
;
3907 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
3908 &disk_to_dev(disk
)->kobj
, "%s", "md");
3909 mutex_unlock(&disks_mutex
);
3911 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
3914 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
3915 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, "array_state");
3921 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
3923 md_alloc(dev
, NULL
);
3927 static int add_named_array(const char *val
, struct kernel_param
*kp
)
3929 /* val must be "md_*" where * is not all digits.
3930 * We allocate an array with a large free minor number, and
3931 * set the name to val. val must not already be an active name.
3933 int len
= strlen(val
);
3934 char buf
[DISK_NAME_LEN
];
3936 while (len
&& val
[len
-1] == '\n')
3938 if (len
>= DISK_NAME_LEN
)
3940 strlcpy(buf
, val
, len
+1);
3941 if (strncmp(buf
, "md_", 3) != 0)
3943 return md_alloc(0, buf
);
3946 static void md_safemode_timeout(unsigned long data
)
3948 mddev_t
*mddev
= (mddev_t
*) data
;
3950 if (!atomic_read(&mddev
->writes_pending
)) {
3951 mddev
->safemode
= 1;
3952 if (mddev
->external
)
3953 sysfs_notify_dirent(mddev
->sysfs_state
);
3955 md_wakeup_thread(mddev
->thread
);
3958 static int start_dirty_degraded
;
3960 static int do_md_run(mddev_t
* mddev
)
3965 struct gendisk
*disk
;
3966 struct mdk_personality
*pers
;
3967 char b
[BDEVNAME_SIZE
];
3969 if (list_empty(&mddev
->disks
))
3970 /* cannot run an array with no devices.. */
3977 * Analyze all RAID superblock(s)
3979 if (!mddev
->raid_disks
) {
3980 if (!mddev
->persistent
)
3985 chunk_size
= mddev
->chunk_size
;
3988 if (chunk_size
> MAX_CHUNK_SIZE
) {
3989 printk(KERN_ERR
"too big chunk_size: %d > %d\n",
3990 chunk_size
, MAX_CHUNK_SIZE
);
3994 * chunk-size has to be a power of 2
3996 if ( (1 << ffz(~chunk_size
)) != chunk_size
) {
3997 printk(KERN_ERR
"chunk_size of %d not valid\n", chunk_size
);
4001 /* devices must have minimum size of one chunk */
4002 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4003 if (test_bit(Faulty
, &rdev
->flags
))
4005 if (rdev
->sectors
< chunk_size
/ 512) {
4007 "md: Dev %s smaller than chunk_size:"
4009 bdevname(rdev
->bdev
,b
),
4010 (unsigned long long)rdev
->sectors
,
4017 if (mddev
->level
!= LEVEL_NONE
)
4018 request_module("md-level-%d", mddev
->level
);
4019 else if (mddev
->clevel
[0])
4020 request_module("md-%s", mddev
->clevel
);
4023 * Drop all container device buffers, from now on
4024 * the only valid external interface is through the md
4027 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4028 if (test_bit(Faulty
, &rdev
->flags
))
4030 sync_blockdev(rdev
->bdev
);
4031 invalidate_bdev(rdev
->bdev
);
4033 /* perform some consistency tests on the device.
4034 * We don't want the data to overlap the metadata,
4035 * Internal Bitmap issues have been handled elsewhere.
4037 if (rdev
->data_offset
< rdev
->sb_start
) {
4038 if (mddev
->dev_sectors
&&
4039 rdev
->data_offset
+ mddev
->dev_sectors
4041 printk("md: %s: data overlaps metadata\n",
4046 if (rdev
->sb_start
+ rdev
->sb_size
/512
4047 > rdev
->data_offset
) {
4048 printk("md: %s: metadata overlaps data\n",
4053 sysfs_notify_dirent(rdev
->sysfs_state
);
4056 md_probe(mddev
->unit
, NULL
, NULL
);
4057 disk
= mddev
->gendisk
;
4061 spin_lock(&pers_lock
);
4062 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4063 if (!pers
|| !try_module_get(pers
->owner
)) {
4064 spin_unlock(&pers_lock
);
4065 if (mddev
->level
!= LEVEL_NONE
)
4066 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4069 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4074 spin_unlock(&pers_lock
);
4075 if (mddev
->level
!= pers
->level
) {
4076 mddev
->level
= pers
->level
;
4077 mddev
->new_level
= pers
->level
;
4079 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4081 if (pers
->level
>= 4 && pers
->level
<= 6)
4082 /* Cannot support integrity (yet) */
4083 blk_integrity_unregister(mddev
->gendisk
);
4085 if (mddev
->reshape_position
!= MaxSector
&&
4086 pers
->start_reshape
== NULL
) {
4087 /* This personality cannot handle reshaping... */
4089 module_put(pers
->owner
);
4093 if (pers
->sync_request
) {
4094 /* Warn if this is a potentially silly
4097 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4101 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4102 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4104 rdev
->bdev
->bd_contains
==
4105 rdev2
->bdev
->bd_contains
) {
4107 "%s: WARNING: %s appears to be"
4108 " on the same physical disk as"
4111 bdevname(rdev
->bdev
,b
),
4112 bdevname(rdev2
->bdev
,b2
));
4119 "True protection against single-disk"
4120 " failure might be compromised.\n");
4123 mddev
->recovery
= 0;
4124 /* may be over-ridden by personality */
4125 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4127 mddev
->barriers_work
= 1;
4128 mddev
->ok_start_degraded
= start_dirty_degraded
;
4131 mddev
->ro
= 2; /* read-only, but switch on first write */
4133 err
= mddev
->pers
->run(mddev
);
4135 printk(KERN_ERR
"md: pers->run() failed ...\n");
4136 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4137 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4138 " but 'external_size' not in effect?\n", __func__
);
4140 "md: invalid array_size %llu > default size %llu\n",
4141 (unsigned long long)mddev
->array_sectors
/ 2,
4142 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4144 mddev
->pers
->stop(mddev
);
4146 if (err
== 0 && mddev
->pers
->sync_request
) {
4147 err
= bitmap_create(mddev
);
4149 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4150 mdname(mddev
), err
);
4151 mddev
->pers
->stop(mddev
);
4155 module_put(mddev
->pers
->owner
);
4157 bitmap_destroy(mddev
);
4160 if (mddev
->pers
->sync_request
) {
4161 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4163 "md: cannot register extra attributes for %s\n",
4165 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
4166 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4169 atomic_set(&mddev
->writes_pending
,0);
4170 mddev
->safemode
= 0;
4171 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4172 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4173 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4176 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4177 if (rdev
->raid_disk
>= 0) {
4179 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4180 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4181 printk("md: cannot register %s for %s\n",
4185 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4188 md_update_sb(mddev
, 0);
4190 set_capacity(disk
, mddev
->array_sectors
);
4192 /* If there is a partially-recovered drive we need to
4193 * start recovery here. If we leave it to md_check_recovery,
4194 * it will remove the drives and not do the right thing
4196 if (mddev
->degraded
&& !mddev
->sync_thread
) {
4198 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4199 if (rdev
->raid_disk
>= 0 &&
4200 !test_bit(In_sync
, &rdev
->flags
) &&
4201 !test_bit(Faulty
, &rdev
->flags
))
4202 /* complete an interrupted recovery */
4204 if (spares
&& mddev
->pers
->sync_request
) {
4205 mddev
->recovery
= 0;
4206 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
4207 mddev
->sync_thread
= md_register_thread(md_do_sync
,
4210 if (!mddev
->sync_thread
) {
4211 printk(KERN_ERR
"%s: could not start resync"
4214 /* leave the spares where they are, it shouldn't hurt */
4215 mddev
->recovery
= 0;
4219 md_wakeup_thread(mddev
->thread
);
4220 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4223 md_new_event(mddev
);
4224 sysfs_notify_dirent(mddev
->sysfs_state
);
4225 if (mddev
->sysfs_action
)
4226 sysfs_notify_dirent(mddev
->sysfs_action
);
4227 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4228 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4232 static int restart_array(mddev_t
*mddev
)
4234 struct gendisk
*disk
= mddev
->gendisk
;
4236 /* Complain if it has no devices */
4237 if (list_empty(&mddev
->disks
))
4243 mddev
->safemode
= 0;
4245 set_disk_ro(disk
, 0);
4246 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4248 /* Kick recovery or resync if necessary */
4249 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4250 md_wakeup_thread(mddev
->thread
);
4251 md_wakeup_thread(mddev
->sync_thread
);
4252 sysfs_notify_dirent(mddev
->sysfs_state
);
4256 /* similar to deny_write_access, but accounts for our holding a reference
4257 * to the file ourselves */
4258 static int deny_bitmap_write_access(struct file
* file
)
4260 struct inode
*inode
= file
->f_mapping
->host
;
4262 spin_lock(&inode
->i_lock
);
4263 if (atomic_read(&inode
->i_writecount
) > 1) {
4264 spin_unlock(&inode
->i_lock
);
4267 atomic_set(&inode
->i_writecount
, -1);
4268 spin_unlock(&inode
->i_lock
);
4273 static void restore_bitmap_write_access(struct file
*file
)
4275 struct inode
*inode
= file
->f_mapping
->host
;
4277 spin_lock(&inode
->i_lock
);
4278 atomic_set(&inode
->i_writecount
, 1);
4279 spin_unlock(&inode
->i_lock
);
4283 * 0 - completely stop and dis-assemble array
4284 * 1 - switch to readonly
4285 * 2 - stop but do not disassemble array
4287 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4290 struct gendisk
*disk
= mddev
->gendisk
;
4292 if (atomic_read(&mddev
->openers
) > is_open
) {
4293 printk("md: %s still in use.\n",mdname(mddev
));
4299 if (mddev
->sync_thread
) {
4300 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4301 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4302 md_unregister_thread(mddev
->sync_thread
);
4303 mddev
->sync_thread
= NULL
;
4306 del_timer_sync(&mddev
->safemode_timer
);
4309 case 1: /* readonly */
4315 case 0: /* disassemble */
4317 bitmap_flush(mddev
);
4318 md_super_wait(mddev
);
4320 set_disk_ro(disk
, 0);
4322 mddev
->pers
->stop(mddev
);
4323 mddev
->queue
->merge_bvec_fn
= NULL
;
4324 mddev
->queue
->unplug_fn
= NULL
;
4325 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4326 module_put(mddev
->pers
->owner
);
4327 if (mddev
->pers
->sync_request
)
4328 mddev
->private = &md_redundancy_group
;
4330 /* tell userspace to handle 'inactive' */
4331 sysfs_notify_dirent(mddev
->sysfs_state
);
4333 set_capacity(disk
, 0);
4339 if (!mddev
->in_sync
|| mddev
->flags
) {
4340 /* mark array as shutdown cleanly */
4342 md_update_sb(mddev
, 1);
4345 set_disk_ro(disk
, 1);
4346 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4350 * Free resources if final stop
4355 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4357 bitmap_destroy(mddev
);
4358 if (mddev
->bitmap_file
) {
4359 restore_bitmap_write_access(mddev
->bitmap_file
);
4360 fput(mddev
->bitmap_file
);
4361 mddev
->bitmap_file
= NULL
;
4363 mddev
->bitmap_offset
= 0;
4365 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4366 if (rdev
->raid_disk
>= 0) {
4368 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4369 sysfs_remove_link(&mddev
->kobj
, nm
);
4372 /* make sure all md_delayed_delete calls have finished */
4373 flush_scheduled_work();
4375 export_array(mddev
);
4377 mddev
->array_sectors
= 0;
4378 mddev
->external_size
= 0;
4379 mddev
->dev_sectors
= 0;
4380 mddev
->raid_disks
= 0;
4381 mddev
->recovery_cp
= 0;
4382 mddev
->resync_min
= 0;
4383 mddev
->resync_max
= MaxSector
;
4384 mddev
->reshape_position
= MaxSector
;
4385 mddev
->external
= 0;
4386 mddev
->persistent
= 0;
4387 mddev
->level
= LEVEL_NONE
;
4388 mddev
->clevel
[0] = 0;
4391 mddev
->metadata_type
[0] = 0;
4392 mddev
->chunk_size
= 0;
4393 mddev
->ctime
= mddev
->utime
= 0;
4395 mddev
->max_disks
= 0;
4397 mddev
->delta_disks
= 0;
4398 mddev
->new_level
= LEVEL_NONE
;
4399 mddev
->new_layout
= 0;
4400 mddev
->new_chunk
= 0;
4401 mddev
->curr_resync
= 0;
4402 mddev
->resync_mismatches
= 0;
4403 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4404 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4405 mddev
->recovery
= 0;
4408 mddev
->degraded
= 0;
4409 mddev
->barriers_work
= 0;
4410 mddev
->safemode
= 0;
4411 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4412 if (mddev
->hold_active
== UNTIL_STOP
)
4413 mddev
->hold_active
= 0;
4415 } else if (mddev
->pers
)
4416 printk(KERN_INFO
"md: %s switched to read-only mode.\n",
4419 blk_integrity_unregister(disk
);
4420 md_new_event(mddev
);
4421 sysfs_notify_dirent(mddev
->sysfs_state
);
4427 static void autorun_array(mddev_t
*mddev
)
4432 if (list_empty(&mddev
->disks
))
4435 printk(KERN_INFO
"md: running: ");
4437 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4438 char b
[BDEVNAME_SIZE
];
4439 printk("<%s>", bdevname(rdev
->bdev
,b
));
4443 err
= do_md_run(mddev
);
4445 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4446 do_md_stop(mddev
, 0, 0);
4451 * lets try to run arrays based on all disks that have arrived
4452 * until now. (those are in pending_raid_disks)
4454 * the method: pick the first pending disk, collect all disks with
4455 * the same UUID, remove all from the pending list and put them into
4456 * the 'same_array' list. Then order this list based on superblock
4457 * update time (freshest comes first), kick out 'old' disks and
4458 * compare superblocks. If everything's fine then run it.
4460 * If "unit" is allocated, then bump its reference count
4462 static void autorun_devices(int part
)
4464 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4466 char b
[BDEVNAME_SIZE
];
4468 printk(KERN_INFO
"md: autorun ...\n");
4469 while (!list_empty(&pending_raid_disks
)) {
4472 LIST_HEAD(candidates
);
4473 rdev0
= list_entry(pending_raid_disks
.next
,
4474 mdk_rdev_t
, same_set
);
4476 printk(KERN_INFO
"md: considering %s ...\n",
4477 bdevname(rdev0
->bdev
,b
));
4478 INIT_LIST_HEAD(&candidates
);
4479 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4480 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4481 printk(KERN_INFO
"md: adding %s ...\n",
4482 bdevname(rdev
->bdev
,b
));
4483 list_move(&rdev
->same_set
, &candidates
);
4486 * now we have a set of devices, with all of them having
4487 * mostly sane superblocks. It's time to allocate the
4491 dev
= MKDEV(mdp_major
,
4492 rdev0
->preferred_minor
<< MdpMinorShift
);
4493 unit
= MINOR(dev
) >> MdpMinorShift
;
4495 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4498 if (rdev0
->preferred_minor
!= unit
) {
4499 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4500 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4504 md_probe(dev
, NULL
, NULL
);
4505 mddev
= mddev_find(dev
);
4506 if (!mddev
|| !mddev
->gendisk
) {
4510 "md: cannot allocate memory for md drive.\n");
4513 if (mddev_lock(mddev
))
4514 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4516 else if (mddev
->raid_disks
|| mddev
->major_version
4517 || !list_empty(&mddev
->disks
)) {
4519 "md: %s already running, cannot run %s\n",
4520 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4521 mddev_unlock(mddev
);
4523 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4524 mddev
->persistent
= 1;
4525 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4526 list_del_init(&rdev
->same_set
);
4527 if (bind_rdev_to_array(rdev
, mddev
))
4530 autorun_array(mddev
);
4531 mddev_unlock(mddev
);
4533 /* on success, candidates will be empty, on error
4536 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4537 list_del_init(&rdev
->same_set
);
4542 printk(KERN_INFO
"md: ... autorun DONE.\n");
4544 #endif /* !MODULE */
4546 static int get_version(void __user
* arg
)
4550 ver
.major
= MD_MAJOR_VERSION
;
4551 ver
.minor
= MD_MINOR_VERSION
;
4552 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4554 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4560 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4562 mdu_array_info_t info
;
4563 int nr
,working
,active
,failed
,spare
;
4566 nr
=working
=active
=failed
=spare
=0;
4567 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4569 if (test_bit(Faulty
, &rdev
->flags
))
4573 if (test_bit(In_sync
, &rdev
->flags
))
4580 info
.major_version
= mddev
->major_version
;
4581 info
.minor_version
= mddev
->minor_version
;
4582 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4583 info
.ctime
= mddev
->ctime
;
4584 info
.level
= mddev
->level
;
4585 info
.size
= mddev
->dev_sectors
/ 2;
4586 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4589 info
.raid_disks
= mddev
->raid_disks
;
4590 info
.md_minor
= mddev
->md_minor
;
4591 info
.not_persistent
= !mddev
->persistent
;
4593 info
.utime
= mddev
->utime
;
4596 info
.state
= (1<<MD_SB_CLEAN
);
4597 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
4598 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4599 info
.active_disks
= active
;
4600 info
.working_disks
= working
;
4601 info
.failed_disks
= failed
;
4602 info
.spare_disks
= spare
;
4604 info
.layout
= mddev
->layout
;
4605 info
.chunk_size
= mddev
->chunk_size
;
4607 if (copy_to_user(arg
, &info
, sizeof(info
)))
4613 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4615 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4616 char *ptr
, *buf
= NULL
;
4619 if (md_allow_write(mddev
))
4620 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4622 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4627 /* bitmap disabled, zero the first byte and copy out */
4628 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4629 file
->pathname
[0] = '\0';
4633 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4637 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4641 strcpy(file
->pathname
, ptr
);
4645 if (copy_to_user(arg
, file
, sizeof(*file
)))
4653 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
4655 mdu_disk_info_t info
;
4658 if (copy_from_user(&info
, arg
, sizeof(info
)))
4661 rdev
= find_rdev_nr(mddev
, info
.number
);
4663 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
4664 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
4665 info
.raid_disk
= rdev
->raid_disk
;
4667 if (test_bit(Faulty
, &rdev
->flags
))
4668 info
.state
|= (1<<MD_DISK_FAULTY
);
4669 else if (test_bit(In_sync
, &rdev
->flags
)) {
4670 info
.state
|= (1<<MD_DISK_ACTIVE
);
4671 info
.state
|= (1<<MD_DISK_SYNC
);
4673 if (test_bit(WriteMostly
, &rdev
->flags
))
4674 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
4676 info
.major
= info
.minor
= 0;
4677 info
.raid_disk
= -1;
4678 info
.state
= (1<<MD_DISK_REMOVED
);
4681 if (copy_to_user(arg
, &info
, sizeof(info
)))
4687 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
4689 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4691 dev_t dev
= MKDEV(info
->major
,info
->minor
);
4693 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
4696 if (!mddev
->raid_disks
) {
4698 /* expecting a device which has a superblock */
4699 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
4702 "md: md_import_device returned %ld\n",
4704 return PTR_ERR(rdev
);
4706 if (!list_empty(&mddev
->disks
)) {
4707 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
4708 mdk_rdev_t
, same_set
);
4709 int err
= super_types
[mddev
->major_version
]
4710 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4713 "md: %s has different UUID to %s\n",
4714 bdevname(rdev
->bdev
,b
),
4715 bdevname(rdev0
->bdev
,b2
));
4720 err
= bind_rdev_to_array(rdev
, mddev
);
4727 * add_new_disk can be used once the array is assembled
4728 * to add "hot spares". They must already have a superblock
4733 if (!mddev
->pers
->hot_add_disk
) {
4735 "%s: personality does not support diskops!\n",
4739 if (mddev
->persistent
)
4740 rdev
= md_import_device(dev
, mddev
->major_version
,
4741 mddev
->minor_version
);
4743 rdev
= md_import_device(dev
, -1, -1);
4746 "md: md_import_device returned %ld\n",
4748 return PTR_ERR(rdev
);
4750 /* set save_raid_disk if appropriate */
4751 if (!mddev
->persistent
) {
4752 if (info
->state
& (1<<MD_DISK_SYNC
) &&
4753 info
->raid_disk
< mddev
->raid_disks
)
4754 rdev
->raid_disk
= info
->raid_disk
;
4756 rdev
->raid_disk
= -1;
4758 super_types
[mddev
->major_version
].
4759 validate_super(mddev
, rdev
);
4760 rdev
->saved_raid_disk
= rdev
->raid_disk
;
4762 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
4763 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4764 set_bit(WriteMostly
, &rdev
->flags
);
4766 clear_bit(WriteMostly
, &rdev
->flags
);
4768 rdev
->raid_disk
= -1;
4769 err
= bind_rdev_to_array(rdev
, mddev
);
4770 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
4771 /* If there is hot_add_disk but no hot_remove_disk
4772 * then added disks for geometry changes,
4773 * and should be added immediately.
4775 super_types
[mddev
->major_version
].
4776 validate_super(mddev
, rdev
);
4777 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
4779 unbind_rdev_from_array(rdev
);
4784 sysfs_notify_dirent(rdev
->sysfs_state
);
4786 md_update_sb(mddev
, 1);
4787 if (mddev
->degraded
)
4788 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4789 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4790 md_wakeup_thread(mddev
->thread
);
4794 /* otherwise, add_new_disk is only allowed
4795 * for major_version==0 superblocks
4797 if (mddev
->major_version
!= 0) {
4798 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
4803 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
4805 rdev
= md_import_device(dev
, -1, 0);
4808 "md: error, md_import_device() returned %ld\n",
4810 return PTR_ERR(rdev
);
4812 rdev
->desc_nr
= info
->number
;
4813 if (info
->raid_disk
< mddev
->raid_disks
)
4814 rdev
->raid_disk
= info
->raid_disk
;
4816 rdev
->raid_disk
= -1;
4818 if (rdev
->raid_disk
< mddev
->raid_disks
)
4819 if (info
->state
& (1<<MD_DISK_SYNC
))
4820 set_bit(In_sync
, &rdev
->flags
);
4822 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
4823 set_bit(WriteMostly
, &rdev
->flags
);
4825 if (!mddev
->persistent
) {
4826 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
4827 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4829 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4830 rdev
->sectors
= calc_num_sectors(rdev
, mddev
->chunk_size
);
4832 err
= bind_rdev_to_array(rdev
, mddev
);
4842 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
4844 char b
[BDEVNAME_SIZE
];
4847 rdev
= find_rdev(mddev
, dev
);
4851 if (rdev
->raid_disk
>= 0)
4854 kick_rdev_from_array(rdev
);
4855 md_update_sb(mddev
, 1);
4856 md_new_event(mddev
);
4860 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
4861 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4865 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
4867 char b
[BDEVNAME_SIZE
];
4874 if (mddev
->major_version
!= 0) {
4875 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
4876 " version-0 superblocks.\n",
4880 if (!mddev
->pers
->hot_add_disk
) {
4882 "%s: personality does not support diskops!\n",
4887 rdev
= md_import_device(dev
, -1, 0);
4890 "md: error, md_import_device() returned %ld\n",
4895 if (mddev
->persistent
)
4896 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
4898 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
4900 rdev
->sectors
= calc_num_sectors(rdev
, mddev
->chunk_size
);
4902 if (test_bit(Faulty
, &rdev
->flags
)) {
4904 "md: can not hot-add faulty %s disk to %s!\n",
4905 bdevname(rdev
->bdev
,b
), mdname(mddev
));
4909 clear_bit(In_sync
, &rdev
->flags
);
4911 rdev
->saved_raid_disk
= -1;
4912 err
= bind_rdev_to_array(rdev
, mddev
);
4917 * The rest should better be atomic, we can have disk failures
4918 * noticed in interrupt contexts ...
4921 rdev
->raid_disk
= -1;
4923 md_update_sb(mddev
, 1);
4926 * Kick recovery, maybe this spare has to be added to the
4927 * array immediately.
4929 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4930 md_wakeup_thread(mddev
->thread
);
4931 md_new_event(mddev
);
4939 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
4944 if (!mddev
->pers
->quiesce
)
4946 if (mddev
->recovery
|| mddev
->sync_thread
)
4948 /* we should be able to change the bitmap.. */
4954 return -EEXIST
; /* cannot add when bitmap is present */
4955 mddev
->bitmap_file
= fget(fd
);
4957 if (mddev
->bitmap_file
== NULL
) {
4958 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
4963 err
= deny_bitmap_write_access(mddev
->bitmap_file
);
4965 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
4967 fput(mddev
->bitmap_file
);
4968 mddev
->bitmap_file
= NULL
;
4971 mddev
->bitmap_offset
= 0; /* file overrides offset */
4972 } else if (mddev
->bitmap
== NULL
)
4973 return -ENOENT
; /* cannot remove what isn't there */
4976 mddev
->pers
->quiesce(mddev
, 1);
4978 err
= bitmap_create(mddev
);
4979 if (fd
< 0 || err
) {
4980 bitmap_destroy(mddev
);
4981 fd
= -1; /* make sure to put the file */
4983 mddev
->pers
->quiesce(mddev
, 0);
4986 if (mddev
->bitmap_file
) {
4987 restore_bitmap_write_access(mddev
->bitmap_file
);
4988 fput(mddev
->bitmap_file
);
4990 mddev
->bitmap_file
= NULL
;
4997 * set_array_info is used two different ways
4998 * The original usage is when creating a new array.
4999 * In this usage, raid_disks is > 0 and it together with
5000 * level, size, not_persistent,layout,chunksize determine the
5001 * shape of the array.
5002 * This will always create an array with a type-0.90.0 superblock.
5003 * The newer usage is when assembling an array.
5004 * In this case raid_disks will be 0, and the major_version field is
5005 * use to determine which style super-blocks are to be found on the devices.
5006 * The minor and patch _version numbers are also kept incase the
5007 * super_block handler wishes to interpret them.
5009 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5012 if (info
->raid_disks
== 0) {
5013 /* just setting version number for superblock loading */
5014 if (info
->major_version
< 0 ||
5015 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5016 super_types
[info
->major_version
].name
== NULL
) {
5017 /* maybe try to auto-load a module? */
5019 "md: superblock version %d not known\n",
5020 info
->major_version
);
5023 mddev
->major_version
= info
->major_version
;
5024 mddev
->minor_version
= info
->minor_version
;
5025 mddev
->patch_version
= info
->patch_version
;
5026 mddev
->persistent
= !info
->not_persistent
;
5029 mddev
->major_version
= MD_MAJOR_VERSION
;
5030 mddev
->minor_version
= MD_MINOR_VERSION
;
5031 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5032 mddev
->ctime
= get_seconds();
5034 mddev
->level
= info
->level
;
5035 mddev
->clevel
[0] = 0;
5036 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5037 mddev
->raid_disks
= info
->raid_disks
;
5038 /* don't set md_minor, it is determined by which /dev/md* was
5041 if (info
->state
& (1<<MD_SB_CLEAN
))
5042 mddev
->recovery_cp
= MaxSector
;
5044 mddev
->recovery_cp
= 0;
5045 mddev
->persistent
= ! info
->not_persistent
;
5046 mddev
->external
= 0;
5048 mddev
->layout
= info
->layout
;
5049 mddev
->chunk_size
= info
->chunk_size
;
5051 mddev
->max_disks
= MD_SB_DISKS
;
5053 if (mddev
->persistent
)
5055 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5057 mddev
->default_bitmap_offset
= MD_SB_BYTES
>> 9;
5058 mddev
->bitmap_offset
= 0;
5060 mddev
->reshape_position
= MaxSector
;
5063 * Generate a 128 bit UUID
5065 get_random_bytes(mddev
->uuid
, 16);
5067 mddev
->new_level
= mddev
->level
;
5068 mddev
->new_chunk
= mddev
->chunk_size
;
5069 mddev
->new_layout
= mddev
->layout
;
5070 mddev
->delta_disks
= 0;
5075 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5077 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5079 if (mddev
->external_size
)
5082 mddev
->array_sectors
= array_sectors
;
5084 EXPORT_SYMBOL(md_set_array_sectors
);
5086 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5090 int fit
= (num_sectors
== 0);
5092 if (mddev
->pers
->resize
== NULL
)
5094 /* The "num_sectors" is the number of sectors of each device that
5095 * is used. This can only make sense for arrays with redundancy.
5096 * linear and raid0 always use whatever space is available. We can only
5097 * consider changing this number if no resync or reconstruction is
5098 * happening, and if the new size is acceptable. It must fit before the
5099 * sb_start or, if that is <data_offset, it must fit before the size
5100 * of each device. If num_sectors is zero, we find the largest size
5104 if (mddev
->sync_thread
)
5107 /* Sorry, cannot grow a bitmap yet, just remove it,
5111 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5112 sector_t avail
= rdev
->sectors
;
5114 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5115 num_sectors
= avail
;
5116 if (avail
< num_sectors
)
5119 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5121 struct block_device
*bdev
;
5123 bdev
= bdget_disk(mddev
->gendisk
, 0);
5125 mutex_lock(&bdev
->bd_inode
->i_mutex
);
5126 i_size_write(bdev
->bd_inode
,
5127 (loff_t
)mddev
->array_sectors
<< 9);
5128 mutex_unlock(&bdev
->bd_inode
->i_mutex
);
5135 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5138 /* change the number of raid disks */
5139 if (mddev
->pers
->check_reshape
== NULL
)
5141 if (raid_disks
<= 0 ||
5142 raid_disks
>= mddev
->max_disks
)
5144 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5146 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5148 rv
= mddev
->pers
->check_reshape(mddev
);
5154 * update_array_info is used to change the configuration of an
5156 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5157 * fields in the info are checked against the array.
5158 * Any differences that cannot be handled will cause an error.
5159 * Normally, only one change can be managed at a time.
5161 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5167 /* calculate expected state,ignoring low bits */
5168 if (mddev
->bitmap
&& mddev
->bitmap_offset
)
5169 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5171 if (mddev
->major_version
!= info
->major_version
||
5172 mddev
->minor_version
!= info
->minor_version
||
5173 /* mddev->patch_version != info->patch_version || */
5174 mddev
->ctime
!= info
->ctime
||
5175 mddev
->level
!= info
->level
||
5176 /* mddev->layout != info->layout || */
5177 !mddev
->persistent
!= info
->not_persistent
||
5178 mddev
->chunk_size
!= info
->chunk_size
||
5179 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5180 ((state
^info
->state
) & 0xfffffe00)
5183 /* Check there is only one change */
5184 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5186 if (mddev
->raid_disks
!= info
->raid_disks
)
5188 if (mddev
->layout
!= info
->layout
)
5190 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5197 if (mddev
->layout
!= info
->layout
) {
5199 * we don't need to do anything at the md level, the
5200 * personality will take care of it all.
5202 if (mddev
->pers
->reconfig
== NULL
)
5205 return mddev
->pers
->reconfig(mddev
, info
->layout
, -1);
5207 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5208 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5210 if (mddev
->raid_disks
!= info
->raid_disks
)
5211 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5213 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5214 if (mddev
->pers
->quiesce
== NULL
)
5216 if (mddev
->recovery
|| mddev
->sync_thread
)
5218 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5219 /* add the bitmap */
5222 if (mddev
->default_bitmap_offset
== 0)
5224 mddev
->bitmap_offset
= mddev
->default_bitmap_offset
;
5225 mddev
->pers
->quiesce(mddev
, 1);
5226 rv
= bitmap_create(mddev
);
5228 bitmap_destroy(mddev
);
5229 mddev
->pers
->quiesce(mddev
, 0);
5231 /* remove the bitmap */
5234 if (mddev
->bitmap
->file
)
5236 mddev
->pers
->quiesce(mddev
, 1);
5237 bitmap_destroy(mddev
);
5238 mddev
->pers
->quiesce(mddev
, 0);
5239 mddev
->bitmap_offset
= 0;
5242 md_update_sb(mddev
, 1);
5246 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5250 if (mddev
->pers
== NULL
)
5253 rdev
= find_rdev(mddev
, dev
);
5257 md_error(mddev
, rdev
);
5262 * We have a problem here : there is no easy way to give a CHS
5263 * virtual geometry. We currently pretend that we have a 2 heads
5264 * 4 sectors (with a BIG number of cylinders...). This drives
5265 * dosfs just mad... ;-)
5267 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5269 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5273 geo
->cylinders
= get_capacity(mddev
->gendisk
) / 8;
5277 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5278 unsigned int cmd
, unsigned long arg
)
5281 void __user
*argp
= (void __user
*)arg
;
5282 mddev_t
*mddev
= NULL
;
5284 if (!capable(CAP_SYS_ADMIN
))
5288 * Commands dealing with the RAID driver but not any
5294 err
= get_version(argp
);
5297 case PRINT_RAID_DEBUG
:
5305 autostart_arrays(arg
);
5312 * Commands creating/starting a new array:
5315 mddev
= bdev
->bd_disk
->private_data
;
5322 err
= mddev_lock(mddev
);
5325 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5332 case SET_ARRAY_INFO
:
5334 mdu_array_info_t info
;
5336 memset(&info
, 0, sizeof(info
));
5337 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5342 err
= update_array_info(mddev
, &info
);
5344 printk(KERN_WARNING
"md: couldn't update"
5345 " array info. %d\n", err
);
5350 if (!list_empty(&mddev
->disks
)) {
5352 "md: array %s already has disks!\n",
5357 if (mddev
->raid_disks
) {
5359 "md: array %s already initialised!\n",
5364 err
= set_array_info(mddev
, &info
);
5366 printk(KERN_WARNING
"md: couldn't set"
5367 " array info. %d\n", err
);
5377 * Commands querying/configuring an existing array:
5379 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5380 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5381 if ((!mddev
->raid_disks
&& !mddev
->external
)
5382 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5383 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5384 && cmd
!= GET_BITMAP_FILE
) {
5390 * Commands even a read-only array can execute:
5394 case GET_ARRAY_INFO
:
5395 err
= get_array_info(mddev
, argp
);
5398 case GET_BITMAP_FILE
:
5399 err
= get_bitmap_file(mddev
, argp
);
5403 err
= get_disk_info(mddev
, argp
);
5406 case RESTART_ARRAY_RW
:
5407 err
= restart_array(mddev
);
5411 err
= do_md_stop(mddev
, 0, 1);
5415 err
= do_md_stop(mddev
, 1, 1);
5421 * The remaining ioctls are changing the state of the
5422 * superblock, so we do not allow them on read-only arrays.
5423 * However non-MD ioctls (e.g. get-size) will still come through
5424 * here and hit the 'default' below, so only disallow
5425 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5427 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5428 if (mddev
->ro
== 2) {
5430 sysfs_notify_dirent(mddev
->sysfs_state
);
5431 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5432 md_wakeup_thread(mddev
->thread
);
5443 mdu_disk_info_t info
;
5444 if (copy_from_user(&info
, argp
, sizeof(info
)))
5447 err
= add_new_disk(mddev
, &info
);
5451 case HOT_REMOVE_DISK
:
5452 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5456 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5459 case SET_DISK_FAULTY
:
5460 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5464 err
= do_md_run(mddev
);
5467 case SET_BITMAP_FILE
:
5468 err
= set_bitmap_file(mddev
, (int)arg
);
5478 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5480 mddev
->hold_active
= 0;
5481 mddev_unlock(mddev
);
5491 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5494 * Succeed if we can lock the mddev, which confirms that
5495 * it isn't being stopped right now.
5497 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5500 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5501 /* we are racing with mddev_put which is discarding this
5505 /* Wait until bdev->bd_disk is definitely gone */
5506 flush_scheduled_work();
5507 /* Then retry the open from the top */
5508 return -ERESTARTSYS
;
5510 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5512 if ((err
= mutex_lock_interruptible_nested(&mddev
->reconfig_mutex
, 1)))
5516 atomic_inc(&mddev
->openers
);
5517 mddev_unlock(mddev
);
5519 check_disk_change(bdev
);
5524 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5526 mddev_t
*mddev
= disk
->private_data
;
5529 atomic_dec(&mddev
->openers
);
5535 static int md_media_changed(struct gendisk
*disk
)
5537 mddev_t
*mddev
= disk
->private_data
;
5539 return mddev
->changed
;
5542 static int md_revalidate(struct gendisk
*disk
)
5544 mddev_t
*mddev
= disk
->private_data
;
5549 static struct block_device_operations md_fops
=
5551 .owner
= THIS_MODULE
,
5553 .release
= md_release
,
5554 .locked_ioctl
= md_ioctl
,
5555 .getgeo
= md_getgeo
,
5556 .media_changed
= md_media_changed
,
5557 .revalidate_disk
= md_revalidate
,
5560 static int md_thread(void * arg
)
5562 mdk_thread_t
*thread
= arg
;
5565 * md_thread is a 'system-thread', it's priority should be very
5566 * high. We avoid resource deadlocks individually in each
5567 * raid personality. (RAID5 does preallocation) We also use RR and
5568 * the very same RT priority as kswapd, thus we will never get
5569 * into a priority inversion deadlock.
5571 * we definitely have to have equal or higher priority than
5572 * bdflush, otherwise bdflush will deadlock if there are too
5573 * many dirty RAID5 blocks.
5576 allow_signal(SIGKILL
);
5577 while (!kthread_should_stop()) {
5579 /* We need to wait INTERRUPTIBLE so that
5580 * we don't add to the load-average.
5581 * That means we need to be sure no signals are
5584 if (signal_pending(current
))
5585 flush_signals(current
);
5587 wait_event_interruptible_timeout
5589 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5590 || kthread_should_stop(),
5593 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5595 thread
->run(thread
->mddev
);
5601 void md_wakeup_thread(mdk_thread_t
*thread
)
5604 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5605 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5606 wake_up(&thread
->wqueue
);
5610 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
5613 mdk_thread_t
*thread
;
5615 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
5619 init_waitqueue_head(&thread
->wqueue
);
5622 thread
->mddev
= mddev
;
5623 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
5624 thread
->tsk
= kthread_run(md_thread
, thread
, name
, mdname(thread
->mddev
));
5625 if (IS_ERR(thread
->tsk
)) {
5632 void md_unregister_thread(mdk_thread_t
*thread
)
5636 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
5638 kthread_stop(thread
->tsk
);
5642 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
5649 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
5652 if (mddev
->external
)
5653 set_bit(Blocked
, &rdev
->flags
);
5655 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5657 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5658 __builtin_return_address(0),__builtin_return_address(1),
5659 __builtin_return_address(2),__builtin_return_address(3));
5663 if (!mddev
->pers
->error_handler
)
5665 mddev
->pers
->error_handler(mddev
,rdev
);
5666 if (mddev
->degraded
)
5667 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5668 set_bit(StateChanged
, &rdev
->flags
);
5669 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5670 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5671 md_wakeup_thread(mddev
->thread
);
5672 md_new_event_inintr(mddev
);
5675 /* seq_file implementation /proc/mdstat */
5677 static void status_unused(struct seq_file
*seq
)
5682 seq_printf(seq
, "unused devices: ");
5684 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
5685 char b
[BDEVNAME_SIZE
];
5687 seq_printf(seq
, "%s ",
5688 bdevname(rdev
->bdev
,b
));
5691 seq_printf(seq
, "<none>");
5693 seq_printf(seq
, "\n");
5697 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
5699 sector_t max_blocks
, resync
, res
;
5700 unsigned long dt
, db
, rt
;
5702 unsigned int per_milli
;
5704 resync
= (mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
))/2;
5706 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
5707 max_blocks
= mddev
->resync_max_sectors
>> 1;
5709 max_blocks
= mddev
->dev_sectors
/ 2;
5712 * Should not happen.
5718 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5719 * in a sector_t, and (max_blocks>>scale) will fit in a
5720 * u32, as those are the requirements for sector_div.
5721 * Thus 'scale' must be at least 10
5724 if (sizeof(sector_t
) > sizeof(unsigned long)) {
5725 while ( max_blocks
/2 > (1ULL<<(scale
+32)))
5728 res
= (resync
>>scale
)*1000;
5729 sector_div(res
, (u32
)((max_blocks
>>scale
)+1));
5733 int i
, x
= per_milli
/50, y
= 20-x
;
5734 seq_printf(seq
, "[");
5735 for (i
= 0; i
< x
; i
++)
5736 seq_printf(seq
, "=");
5737 seq_printf(seq
, ">");
5738 for (i
= 0; i
< y
; i
++)
5739 seq_printf(seq
, ".");
5740 seq_printf(seq
, "] ");
5742 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
5743 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
5745 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
5747 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
5748 "resync" : "recovery"))),
5749 per_milli
/10, per_milli
% 10,
5750 (unsigned long long) resync
,
5751 (unsigned long long) max_blocks
);
5754 * We do not want to overflow, so the order of operands and
5755 * the * 100 / 100 trick are important. We do a +1 to be
5756 * safe against division by zero. We only estimate anyway.
5758 * dt: time from mark until now
5759 * db: blocks written from mark until now
5760 * rt: remaining time
5762 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
5764 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
5765 - mddev
->resync_mark_cnt
;
5766 rt
= (dt
* ((unsigned long)(max_blocks
-resync
) / (db
/2/100+1)))/100;
5768 seq_printf(seq
, " finish=%lu.%lumin", rt
/ 60, (rt
% 60)/6);
5770 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
5773 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
5775 struct list_head
*tmp
;
5785 spin_lock(&all_mddevs_lock
);
5786 list_for_each(tmp
,&all_mddevs
)
5788 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
5790 spin_unlock(&all_mddevs_lock
);
5793 spin_unlock(&all_mddevs_lock
);
5795 return (void*)2;/* tail */
5799 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
5801 struct list_head
*tmp
;
5802 mddev_t
*next_mddev
, *mddev
= v
;
5808 spin_lock(&all_mddevs_lock
);
5810 tmp
= all_mddevs
.next
;
5812 tmp
= mddev
->all_mddevs
.next
;
5813 if (tmp
!= &all_mddevs
)
5814 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
5816 next_mddev
= (void*)2;
5819 spin_unlock(&all_mddevs_lock
);
5827 static void md_seq_stop(struct seq_file
*seq
, void *v
)
5831 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
5835 struct mdstat_info
{
5839 static int md_seq_show(struct seq_file
*seq
, void *v
)
5844 struct mdstat_info
*mi
= seq
->private;
5845 struct bitmap
*bitmap
;
5847 if (v
== (void*)1) {
5848 struct mdk_personality
*pers
;
5849 seq_printf(seq
, "Personalities : ");
5850 spin_lock(&pers_lock
);
5851 list_for_each_entry(pers
, &pers_list
, list
)
5852 seq_printf(seq
, "[%s] ", pers
->name
);
5854 spin_unlock(&pers_lock
);
5855 seq_printf(seq
, "\n");
5856 mi
->event
= atomic_read(&md_event_count
);
5859 if (v
== (void*)2) {
5864 if (mddev_lock(mddev
) < 0)
5867 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
5868 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
5869 mddev
->pers
? "" : "in");
5872 seq_printf(seq
, " (read-only)");
5874 seq_printf(seq
, " (auto-read-only)");
5875 seq_printf(seq
, " %s", mddev
->pers
->name
);
5879 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5880 char b
[BDEVNAME_SIZE
];
5881 seq_printf(seq
, " %s[%d]",
5882 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
5883 if (test_bit(WriteMostly
, &rdev
->flags
))
5884 seq_printf(seq
, "(W)");
5885 if (test_bit(Faulty
, &rdev
->flags
)) {
5886 seq_printf(seq
, "(F)");
5888 } else if (rdev
->raid_disk
< 0)
5889 seq_printf(seq
, "(S)"); /* spare */
5890 sectors
+= rdev
->sectors
;
5893 if (!list_empty(&mddev
->disks
)) {
5895 seq_printf(seq
, "\n %llu blocks",
5896 (unsigned long long)
5897 mddev
->array_sectors
/ 2);
5899 seq_printf(seq
, "\n %llu blocks",
5900 (unsigned long long)sectors
/ 2);
5902 if (mddev
->persistent
) {
5903 if (mddev
->major_version
!= 0 ||
5904 mddev
->minor_version
!= 90) {
5905 seq_printf(seq
," super %d.%d",
5906 mddev
->major_version
,
5907 mddev
->minor_version
);
5909 } else if (mddev
->external
)
5910 seq_printf(seq
, " super external:%s",
5911 mddev
->metadata_type
);
5913 seq_printf(seq
, " super non-persistent");
5916 mddev
->pers
->status(seq
, mddev
);
5917 seq_printf(seq
, "\n ");
5918 if (mddev
->pers
->sync_request
) {
5919 if (mddev
->curr_resync
> 2) {
5920 status_resync(seq
, mddev
);
5921 seq_printf(seq
, "\n ");
5922 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
5923 seq_printf(seq
, "\tresync=DELAYED\n ");
5924 else if (mddev
->recovery_cp
< MaxSector
)
5925 seq_printf(seq
, "\tresync=PENDING\n ");
5928 seq_printf(seq
, "\n ");
5930 if ((bitmap
= mddev
->bitmap
)) {
5931 unsigned long chunk_kb
;
5932 unsigned long flags
;
5933 spin_lock_irqsave(&bitmap
->lock
, flags
);
5934 chunk_kb
= bitmap
->chunksize
>> 10;
5935 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
5937 bitmap
->pages
- bitmap
->missing_pages
,
5939 (bitmap
->pages
- bitmap
->missing_pages
)
5940 << (PAGE_SHIFT
- 10),
5941 chunk_kb
? chunk_kb
: bitmap
->chunksize
,
5942 chunk_kb
? "KB" : "B");
5944 seq_printf(seq
, ", file: ");
5945 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
5948 seq_printf(seq
, "\n");
5949 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
5952 seq_printf(seq
, "\n");
5954 mddev_unlock(mddev
);
5959 static struct seq_operations md_seq_ops
= {
5960 .start
= md_seq_start
,
5961 .next
= md_seq_next
,
5962 .stop
= md_seq_stop
,
5963 .show
= md_seq_show
,
5966 static int md_seq_open(struct inode
*inode
, struct file
*file
)
5969 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
5973 error
= seq_open(file
, &md_seq_ops
);
5977 struct seq_file
*p
= file
->private_data
;
5979 mi
->event
= atomic_read(&md_event_count
);
5984 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
5986 struct seq_file
*m
= filp
->private_data
;
5987 struct mdstat_info
*mi
= m
->private;
5990 poll_wait(filp
, &md_event_waiters
, wait
);
5992 /* always allow read */
5993 mask
= POLLIN
| POLLRDNORM
;
5995 if (mi
->event
!= atomic_read(&md_event_count
))
5996 mask
|= POLLERR
| POLLPRI
;
6000 static const struct file_operations md_seq_fops
= {
6001 .owner
= THIS_MODULE
,
6002 .open
= md_seq_open
,
6004 .llseek
= seq_lseek
,
6005 .release
= seq_release_private
,
6006 .poll
= mdstat_poll
,
6009 int register_md_personality(struct mdk_personality
*p
)
6011 spin_lock(&pers_lock
);
6012 list_add_tail(&p
->list
, &pers_list
);
6013 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6014 spin_unlock(&pers_lock
);
6018 int unregister_md_personality(struct mdk_personality
*p
)
6020 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6021 spin_lock(&pers_lock
);
6022 list_del_init(&p
->list
);
6023 spin_unlock(&pers_lock
);
6027 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6035 rdev_for_each_rcu(rdev
, mddev
) {
6036 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6037 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6038 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6039 atomic_read(&disk
->sync_io
);
6040 /* sync IO will cause sync_io to increase before the disk_stats
6041 * as sync_io is counted when a request starts, and
6042 * disk_stats is counted when it completes.
6043 * So resync activity will cause curr_events to be smaller than
6044 * when there was no such activity.
6045 * non-sync IO will cause disk_stat to increase without
6046 * increasing sync_io so curr_events will (eventually)
6047 * be larger than it was before. Once it becomes
6048 * substantially larger, the test below will cause
6049 * the array to appear non-idle, and resync will slow
6051 * If there is a lot of outstanding resync activity when
6052 * we set last_event to curr_events, then all that activity
6053 * completing might cause the array to appear non-idle
6054 * and resync will be slowed down even though there might
6055 * not have been non-resync activity. This will only
6056 * happen once though. 'last_events' will soon reflect
6057 * the state where there is little or no outstanding
6058 * resync requests, and further resync activity will
6059 * always make curr_events less than last_events.
6062 if (init
|| curr_events
- rdev
->last_events
> 64) {
6063 rdev
->last_events
= curr_events
;
6071 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6073 /* another "blocks" (512byte) blocks have been synced */
6074 atomic_sub(blocks
, &mddev
->recovery_active
);
6075 wake_up(&mddev
->recovery_wait
);
6077 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6078 md_wakeup_thread(mddev
->thread
);
6079 // stop recovery, signal do_sync ....
6084 /* md_write_start(mddev, bi)
6085 * If we need to update some array metadata (e.g. 'active' flag
6086 * in superblock) before writing, schedule a superblock update
6087 * and wait for it to complete.
6089 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6092 if (bio_data_dir(bi
) != WRITE
)
6095 BUG_ON(mddev
->ro
== 1);
6096 if (mddev
->ro
== 2) {
6097 /* need to switch to read/write */
6099 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6100 md_wakeup_thread(mddev
->thread
);
6101 md_wakeup_thread(mddev
->sync_thread
);
6104 atomic_inc(&mddev
->writes_pending
);
6105 if (mddev
->safemode
== 1)
6106 mddev
->safemode
= 0;
6107 if (mddev
->in_sync
) {
6108 spin_lock_irq(&mddev
->write_lock
);
6109 if (mddev
->in_sync
) {
6111 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6112 md_wakeup_thread(mddev
->thread
);
6115 spin_unlock_irq(&mddev
->write_lock
);
6118 sysfs_notify_dirent(mddev
->sysfs_state
);
6119 wait_event(mddev
->sb_wait
,
6120 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
6121 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6124 void md_write_end(mddev_t
*mddev
)
6126 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6127 if (mddev
->safemode
== 2)
6128 md_wakeup_thread(mddev
->thread
);
6129 else if (mddev
->safemode_delay
)
6130 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6134 /* md_allow_write(mddev)
6135 * Calling this ensures that the array is marked 'active' so that writes
6136 * may proceed without blocking. It is important to call this before
6137 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6138 * Must be called with mddev_lock held.
6140 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6141 * is dropped, so return -EAGAIN after notifying userspace.
6143 int md_allow_write(mddev_t
*mddev
)
6149 if (!mddev
->pers
->sync_request
)
6152 spin_lock_irq(&mddev
->write_lock
);
6153 if (mddev
->in_sync
) {
6155 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6156 if (mddev
->safemode_delay
&&
6157 mddev
->safemode
== 0)
6158 mddev
->safemode
= 1;
6159 spin_unlock_irq(&mddev
->write_lock
);
6160 md_update_sb(mddev
, 0);
6161 sysfs_notify_dirent(mddev
->sysfs_state
);
6163 spin_unlock_irq(&mddev
->write_lock
);
6165 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
6170 EXPORT_SYMBOL_GPL(md_allow_write
);
6172 #define SYNC_MARKS 10
6173 #define SYNC_MARK_STEP (3*HZ)
6174 void md_do_sync(mddev_t
*mddev
)
6177 unsigned int currspeed
= 0,
6179 sector_t max_sectors
,j
, io_sectors
;
6180 unsigned long mark
[SYNC_MARKS
];
6181 sector_t mark_cnt
[SYNC_MARKS
];
6183 struct list_head
*tmp
;
6184 sector_t last_check
;
6189 /* just incase thread restarts... */
6190 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6192 if (mddev
->ro
) /* never try to sync a read-only array */
6195 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6196 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6197 desc
= "data-check";
6198 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6199 desc
= "requested-resync";
6202 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6207 /* we overload curr_resync somewhat here.
6208 * 0 == not engaged in resync at all
6209 * 2 == checking that there is no conflict with another sync
6210 * 1 == like 2, but have yielded to allow conflicting resync to
6212 * other == active in resync - this many blocks
6214 * Before starting a resync we must have set curr_resync to
6215 * 2, and then checked that every "conflicting" array has curr_resync
6216 * less than ours. When we find one that is the same or higher
6217 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6218 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6219 * This will mean we have to start checking from the beginning again.
6224 mddev
->curr_resync
= 2;
6227 if (kthread_should_stop()) {
6228 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6231 for_each_mddev(mddev2
, tmp
) {
6232 if (mddev2
== mddev
)
6234 if (!mddev
->parallel_resync
6235 && mddev2
->curr_resync
6236 && match_mddev_units(mddev
, mddev2
)) {
6238 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6239 /* arbitrarily yield */
6240 mddev
->curr_resync
= 1;
6241 wake_up(&resync_wait
);
6243 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6244 /* no need to wait here, we can wait the next
6245 * time 'round when curr_resync == 2
6248 /* We need to wait 'interruptible' so as not to
6249 * contribute to the load average, and not to
6250 * be caught by 'softlockup'
6252 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6253 if (!kthread_should_stop() &&
6254 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6255 printk(KERN_INFO
"md: delaying %s of %s"
6256 " until %s has finished (they"
6257 " share one or more physical units)\n",
6258 desc
, mdname(mddev
), mdname(mddev2
));
6260 if (signal_pending(current
))
6261 flush_signals(current
);
6263 finish_wait(&resync_wait
, &wq
);
6266 finish_wait(&resync_wait
, &wq
);
6269 } while (mddev
->curr_resync
< 2);
6272 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6273 /* resync follows the size requested by the personality,
6274 * which defaults to physical size, but can be virtual size
6276 max_sectors
= mddev
->resync_max_sectors
;
6277 mddev
->resync_mismatches
= 0;
6278 /* we don't use the checkpoint if there's a bitmap */
6279 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6280 j
= mddev
->resync_min
;
6281 else if (!mddev
->bitmap
)
6282 j
= mddev
->recovery_cp
;
6284 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6285 max_sectors
= mddev
->dev_sectors
;
6287 /* recovery follows the physical size of devices */
6288 max_sectors
= mddev
->dev_sectors
;
6290 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6291 if (rdev
->raid_disk
>= 0 &&
6292 !test_bit(Faulty
, &rdev
->flags
) &&
6293 !test_bit(In_sync
, &rdev
->flags
) &&
6294 rdev
->recovery_offset
< j
)
6295 j
= rdev
->recovery_offset
;
6298 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6299 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6300 " %d KB/sec/disk.\n", speed_min(mddev
));
6301 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6302 "(but not more than %d KB/sec) for %s.\n",
6303 speed_max(mddev
), desc
);
6305 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6308 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6310 mark_cnt
[m
] = io_sectors
;
6313 mddev
->resync_mark
= mark
[last_mark
];
6314 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6317 * Tune reconstruction:
6319 window
= 32*(PAGE_SIZE
/512);
6320 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6321 window
/2,(unsigned long long) max_sectors
/2);
6323 atomic_set(&mddev
->recovery_active
, 0);
6328 "md: resuming %s of %s from checkpoint.\n",
6329 desc
, mdname(mddev
));
6330 mddev
->curr_resync
= j
;
6333 while (j
< max_sectors
) {
6337 if (j
>= mddev
->resync_max
) {
6338 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6339 wait_event(mddev
->recovery_wait
,
6340 mddev
->resync_max
> j
6341 || kthread_should_stop());
6343 if (kthread_should_stop())
6346 if (mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6347 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6348 > (max_sectors
>> 4)) {
6349 /* time to update curr_resync_completed */
6350 blk_unplug(mddev
->queue
);
6351 wait_event(mddev
->recovery_wait
,
6352 atomic_read(&mddev
->recovery_active
) == 0);
6353 mddev
->curr_resync_completed
=
6355 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6357 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6358 currspeed
< speed_min(mddev
));
6360 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6364 if (!skipped
) { /* actual IO requested */
6365 io_sectors
+= sectors
;
6366 atomic_add(sectors
, &mddev
->recovery_active
);
6370 if (j
>1) mddev
->curr_resync
= j
;
6371 mddev
->curr_mark_cnt
= io_sectors
;
6372 if (last_check
== 0)
6373 /* this is the earliers that rebuilt will be
6374 * visible in /proc/mdstat
6376 md_new_event(mddev
);
6378 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6381 last_check
= io_sectors
;
6383 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6387 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6389 int next
= (last_mark
+1) % SYNC_MARKS
;
6391 mddev
->resync_mark
= mark
[next
];
6392 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6393 mark
[next
] = jiffies
;
6394 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6399 if (kthread_should_stop())
6404 * this loop exits only if either when we are slower than
6405 * the 'hard' speed limit, or the system was IO-idle for
6407 * the system might be non-idle CPU-wise, but we only care
6408 * about not overloading the IO subsystem. (things like an
6409 * e2fsck being done on the RAID array should execute fast)
6411 blk_unplug(mddev
->queue
);
6414 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6415 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6417 if (currspeed
> speed_min(mddev
)) {
6418 if ((currspeed
> speed_max(mddev
)) ||
6419 !is_mddev_idle(mddev
, 0)) {
6425 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6427 * this also signals 'finished resyncing' to md_stop
6430 blk_unplug(mddev
->queue
);
6432 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6434 /* tell personality that we are finished */
6435 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6437 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6438 mddev
->curr_resync
> 2) {
6439 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6440 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6441 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6443 "md: checkpointing %s of %s.\n",
6444 desc
, mdname(mddev
));
6445 mddev
->recovery_cp
= mddev
->curr_resync
;
6448 mddev
->recovery_cp
= MaxSector
;
6450 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6451 mddev
->curr_resync
= MaxSector
;
6452 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6453 if (rdev
->raid_disk
>= 0 &&
6454 !test_bit(Faulty
, &rdev
->flags
) &&
6455 !test_bit(In_sync
, &rdev
->flags
) &&
6456 rdev
->recovery_offset
< mddev
->curr_resync
)
6457 rdev
->recovery_offset
= mddev
->curr_resync
;
6460 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6463 mddev
->curr_resync
= 0;
6464 mddev
->resync_min
= 0;
6465 mddev
->resync_max
= MaxSector
;
6466 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6467 wake_up(&resync_wait
);
6468 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6469 md_wakeup_thread(mddev
->thread
);
6474 * got a signal, exit.
6477 "md: md_do_sync() got signal ... exiting\n");
6478 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6482 EXPORT_SYMBOL_GPL(md_do_sync
);
6485 static int remove_and_add_spares(mddev_t
*mddev
)
6490 mddev
->curr_resync_completed
= 0;
6492 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6493 if (rdev
->raid_disk
>= 0 &&
6494 !test_bit(Blocked
, &rdev
->flags
) &&
6495 (test_bit(Faulty
, &rdev
->flags
) ||
6496 ! test_bit(In_sync
, &rdev
->flags
)) &&
6497 atomic_read(&rdev
->nr_pending
)==0) {
6498 if (mddev
->pers
->hot_remove_disk(
6499 mddev
, rdev
->raid_disk
)==0) {
6501 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6502 sysfs_remove_link(&mddev
->kobj
, nm
);
6503 rdev
->raid_disk
= -1;
6507 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6508 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6509 if (rdev
->raid_disk
>= 0 &&
6510 !test_bit(In_sync
, &rdev
->flags
) &&
6511 !test_bit(Blocked
, &rdev
->flags
))
6513 if (rdev
->raid_disk
< 0
6514 && !test_bit(Faulty
, &rdev
->flags
)) {
6515 rdev
->recovery_offset
= 0;
6517 hot_add_disk(mddev
, rdev
) == 0) {
6519 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6520 if (sysfs_create_link(&mddev
->kobj
,
6523 "md: cannot register "
6527 md_new_event(mddev
);
6536 * This routine is regularly called by all per-raid-array threads to
6537 * deal with generic issues like resync and super-block update.
6538 * Raid personalities that don't have a thread (linear/raid0) do not
6539 * need this as they never do any recovery or update the superblock.
6541 * It does not do any resync itself, but rather "forks" off other threads
6542 * to do that as needed.
6543 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6544 * "->recovery" and create a thread at ->sync_thread.
6545 * When the thread finishes it sets MD_RECOVERY_DONE
6546 * and wakeups up this thread which will reap the thread and finish up.
6547 * This thread also removes any faulty devices (with nr_pending == 0).
6549 * The overall approach is:
6550 * 1/ if the superblock needs updating, update it.
6551 * 2/ If a recovery thread is running, don't do anything else.
6552 * 3/ If recovery has finished, clean up, possibly marking spares active.
6553 * 4/ If there are any faulty devices, remove them.
6554 * 5/ If array is degraded, try to add spares devices
6555 * 6/ If array has spares or is not in-sync, start a resync thread.
6557 void md_check_recovery(mddev_t
*mddev
)
6563 bitmap_daemon_work(mddev
->bitmap
);
6568 if (signal_pending(current
)) {
6569 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
6570 printk(KERN_INFO
"md: %s in immediate safe mode\n",
6572 mddev
->safemode
= 2;
6574 flush_signals(current
);
6577 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
6580 (mddev
->flags
&& !mddev
->external
) ||
6581 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
6582 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
6583 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
6584 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
6585 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
6589 if (mddev_trylock(mddev
)) {
6593 /* Only thing we do on a ro array is remove
6596 remove_and_add_spares(mddev
);
6597 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6601 if (!mddev
->external
) {
6603 spin_lock_irq(&mddev
->write_lock
);
6604 if (mddev
->safemode
&&
6605 !atomic_read(&mddev
->writes_pending
) &&
6607 mddev
->recovery_cp
== MaxSector
) {
6610 if (mddev
->persistent
)
6611 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6613 if (mddev
->safemode
== 1)
6614 mddev
->safemode
= 0;
6615 spin_unlock_irq(&mddev
->write_lock
);
6617 sysfs_notify_dirent(mddev
->sysfs_state
);
6621 md_update_sb(mddev
, 0);
6623 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6624 if (test_and_clear_bit(StateChanged
, &rdev
->flags
))
6625 sysfs_notify_dirent(rdev
->sysfs_state
);
6628 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
6629 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
6630 /* resync/recovery still happening */
6631 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6634 if (mddev
->sync_thread
) {
6635 /* resync has finished, collect result */
6636 md_unregister_thread(mddev
->sync_thread
);
6637 mddev
->sync_thread
= NULL
;
6638 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
6639 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
6641 /* activate any spares */
6642 if (mddev
->pers
->spare_active(mddev
))
6643 sysfs_notify(&mddev
->kobj
, NULL
,
6646 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6647 mddev
->pers
->finish_reshape
)
6648 mddev
->pers
->finish_reshape(mddev
);
6649 md_update_sb(mddev
, 1);
6651 /* if array is no-longer degraded, then any saved_raid_disk
6652 * information must be scrapped
6654 if (!mddev
->degraded
)
6655 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6656 rdev
->saved_raid_disk
= -1;
6658 mddev
->recovery
= 0;
6659 /* flag recovery needed just to double check */
6660 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6661 sysfs_notify_dirent(mddev
->sysfs_action
);
6662 md_new_event(mddev
);
6665 /* Set RUNNING before clearing NEEDED to avoid
6666 * any transients in the value of "sync_action".
6668 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6669 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6670 /* Clear some bits that don't mean anything, but
6673 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6674 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6676 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
6678 /* no recovery is running.
6679 * remove any failed drives, then
6680 * add spares if possible.
6681 * Spare are also removed and re-added, to allow
6682 * the personality to fail the re-add.
6685 if (mddev
->reshape_position
!= MaxSector
) {
6686 if (mddev
->pers
->check_reshape(mddev
) != 0)
6687 /* Cannot proceed */
6689 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
6690 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6691 } else if ((spares
= remove_and_add_spares(mddev
))) {
6692 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6693 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
6694 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
6695 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6696 } else if (mddev
->recovery_cp
< MaxSector
) {
6697 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
6698 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6699 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6700 /* nothing to be done ... */
6703 if (mddev
->pers
->sync_request
) {
6704 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
6705 /* We are adding a device or devices to an array
6706 * which has the bitmap stored on all devices.
6707 * So make sure all bitmap pages get written
6709 bitmap_write_all(mddev
->bitmap
);
6711 mddev
->sync_thread
= md_register_thread(md_do_sync
,
6714 if (!mddev
->sync_thread
) {
6715 printk(KERN_ERR
"%s: could not start resync"
6718 /* leave the spares where they are, it shouldn't hurt */
6719 mddev
->recovery
= 0;
6721 md_wakeup_thread(mddev
->sync_thread
);
6722 sysfs_notify_dirent(mddev
->sysfs_action
);
6723 md_new_event(mddev
);
6726 if (!mddev
->sync_thread
) {
6727 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
6728 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
6730 if (mddev
->sysfs_action
)
6731 sysfs_notify_dirent(mddev
->sysfs_action
);
6733 mddev_unlock(mddev
);
6737 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
6739 sysfs_notify_dirent(rdev
->sysfs_state
);
6740 wait_event_timeout(rdev
->blocked_wait
,
6741 !test_bit(Blocked
, &rdev
->flags
),
6742 msecs_to_jiffies(5000));
6743 rdev_dec_pending(rdev
, mddev
);
6745 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
6747 static int md_notify_reboot(struct notifier_block
*this,
6748 unsigned long code
, void *x
)
6750 struct list_head
*tmp
;
6753 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
6755 printk(KERN_INFO
"md: stopping all md devices.\n");
6757 for_each_mddev(mddev
, tmp
)
6758 if (mddev_trylock(mddev
)) {
6759 /* Force a switch to readonly even array
6760 * appears to still be in use. Hence
6763 do_md_stop(mddev
, 1, 100);
6764 mddev_unlock(mddev
);
6767 * certain more exotic SCSI devices are known to be
6768 * volatile wrt too early system reboots. While the
6769 * right place to handle this issue is the given
6770 * driver, we do want to have a safe RAID driver ...
6777 static struct notifier_block md_notifier
= {
6778 .notifier_call
= md_notify_reboot
,
6780 .priority
= INT_MAX
, /* before any real devices */
6783 static void md_geninit(void)
6785 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
6787 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
6790 static int __init
md_init(void)
6792 if (register_blkdev(MD_MAJOR
, "md"))
6794 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
6795 unregister_blkdev(MD_MAJOR
, "md");
6798 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6799 md_probe
, NULL
, NULL
);
6800 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
6801 md_probe
, NULL
, NULL
);
6803 register_reboot_notifier(&md_notifier
);
6804 raid_table_header
= register_sysctl_table(raid_root_table
);
6814 * Searches all registered partitions for autorun RAID arrays
6818 static LIST_HEAD(all_detected_devices
);
6819 struct detected_devices_node
{
6820 struct list_head list
;
6824 void md_autodetect_dev(dev_t dev
)
6826 struct detected_devices_node
*node_detected_dev
;
6828 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
6829 if (node_detected_dev
) {
6830 node_detected_dev
->dev
= dev
;
6831 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
6833 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
6834 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
6839 static void autostart_arrays(int part
)
6842 struct detected_devices_node
*node_detected_dev
;
6844 int i_scanned
, i_passed
;
6849 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
6851 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
6853 node_detected_dev
= list_entry(all_detected_devices
.next
,
6854 struct detected_devices_node
, list
);
6855 list_del(&node_detected_dev
->list
);
6856 dev
= node_detected_dev
->dev
;
6857 kfree(node_detected_dev
);
6858 rdev
= md_import_device(dev
,0, 90);
6862 if (test_bit(Faulty
, &rdev
->flags
)) {
6866 set_bit(AutoDetected
, &rdev
->flags
);
6867 list_add(&rdev
->same_set
, &pending_raid_disks
);
6871 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
6872 i_scanned
, i_passed
);
6874 autorun_devices(part
);
6877 #endif /* !MODULE */
6879 static __exit
void md_exit(void)
6882 struct list_head
*tmp
;
6884 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
6885 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
6887 unregister_blkdev(MD_MAJOR
,"md");
6888 unregister_blkdev(mdp_major
, "mdp");
6889 unregister_reboot_notifier(&md_notifier
);
6890 unregister_sysctl_table(raid_table_header
);
6891 remove_proc_entry("mdstat", NULL
);
6892 for_each_mddev(mddev
, tmp
) {
6893 export_array(mddev
);
6894 mddev
->hold_active
= 0;
6898 subsys_initcall(md_init
);
6899 module_exit(md_exit
)
6901 static int get_ro(char *buffer
, struct kernel_param
*kp
)
6903 return sprintf(buffer
, "%d", start_readonly
);
6905 static int set_ro(const char *val
, struct kernel_param
*kp
)
6908 int num
= simple_strtoul(val
, &e
, 10);
6909 if (*val
&& (*e
== '\0' || *e
== '\n')) {
6910 start_readonly
= num
;
6916 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
6917 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
6919 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
6921 EXPORT_SYMBOL(register_md_personality
);
6922 EXPORT_SYMBOL(unregister_md_personality
);
6923 EXPORT_SYMBOL(md_error
);
6924 EXPORT_SYMBOL(md_done_sync
);
6925 EXPORT_SYMBOL(md_write_start
);
6926 EXPORT_SYMBOL(md_write_end
);
6927 EXPORT_SYMBOL(md_register_thread
);
6928 EXPORT_SYMBOL(md_unregister_thread
);
6929 EXPORT_SYMBOL(md_wakeup_thread
);
6930 EXPORT_SYMBOL(md_check_recovery
);
6931 MODULE_LICENSE("GPL");
6933 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);