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/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/reboot.h>
47 #include <linux/file.h>
48 #include <linux/compat.h>
49 #include <linux/delay.h>
50 #include <linux/raid/md_p.h>
51 #include <linux/raid/md_u.h>
52 #include <linux/slab.h>
57 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part
);
64 static LIST_HEAD(pers_list
);
65 static DEFINE_SPINLOCK(pers_lock
);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
71 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
74 * Default number of read corrections we'll attempt on an rdev
75 * before ejecting it from the array. We divide the read error
76 * count by 2 for every hour elapsed between read errors.
78 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min
= 1000;
93 static int sysctl_speed_limit_max
= 200000;
94 static inline int speed_min(mddev_t
*mddev
)
96 return mddev
->sync_speed_min
?
97 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
100 static inline int speed_max(mddev_t
*mddev
)
102 return mddev
->sync_speed_max
?
103 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
106 static struct ctl_table_header
*raid_table_header
;
108 static ctl_table raid_table
[] = {
110 .procname
= "speed_limit_min",
111 .data
= &sysctl_speed_limit_min
,
112 .maxlen
= sizeof(int),
113 .mode
= S_IRUGO
|S_IWUSR
,
114 .proc_handler
= proc_dointvec
,
117 .procname
= "speed_limit_max",
118 .data
= &sysctl_speed_limit_max
,
119 .maxlen
= sizeof(int),
120 .mode
= S_IRUGO
|S_IWUSR
,
121 .proc_handler
= proc_dointvec
,
126 static ctl_table raid_dir_table
[] = {
130 .mode
= S_IRUGO
|S_IXUGO
,
136 static ctl_table raid_root_table
[] = {
141 .child
= raid_dir_table
,
146 static const struct block_device_operations md_fops
;
148 static int start_readonly
;
151 * We have a system wide 'event count' that is incremented
152 * on any 'interesting' event, and readers of /proc/mdstat
153 * can use 'poll' or 'select' to find out when the event
157 * start array, stop array, error, add device, remove device,
158 * start build, activate spare
160 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
161 static atomic_t md_event_count
;
162 void md_new_event(mddev_t
*mddev
)
164 atomic_inc(&md_event_count
);
165 wake_up(&md_event_waiters
);
167 EXPORT_SYMBOL_GPL(md_new_event
);
169 /* Alternate version that can be called from interrupts
170 * when calling sysfs_notify isn't needed.
172 static void md_new_event_inintr(mddev_t
*mddev
)
174 atomic_inc(&md_event_count
);
175 wake_up(&md_event_waiters
);
179 * Enables to iterate over all existing md arrays
180 * all_mddevs_lock protects this list.
182 static LIST_HEAD(all_mddevs
);
183 static DEFINE_SPINLOCK(all_mddevs_lock
);
187 * iterates through all used mddevs in the system.
188 * We take care to grab the all_mddevs_lock whenever navigating
189 * the list, and to always hold a refcount when unlocked.
190 * Any code which breaks out of this loop while own
191 * a reference to the current mddev and must mddev_put it.
193 #define for_each_mddev(mddev,tmp) \
195 for (({ spin_lock(&all_mddevs_lock); \
196 tmp = all_mddevs.next; \
198 ({ if (tmp != &all_mddevs) \
199 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
200 spin_unlock(&all_mddevs_lock); \
201 if (mddev) mddev_put(mddev); \
202 mddev = list_entry(tmp, mddev_t, all_mddevs); \
203 tmp != &all_mddevs;}); \
204 ({ spin_lock(&all_mddevs_lock); \
209 /* Rather than calling directly into the personality make_request function,
210 * IO requests come here first so that we can check if the device is
211 * being suspended pending a reconfiguration.
212 * We hold a refcount over the call to ->make_request. By the time that
213 * call has finished, the bio has been linked into some internal structure
214 * and so is visible to ->quiesce(), so we don't need the refcount any more.
216 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
218 const int rw
= bio_data_dir(bio
);
219 mddev_t
*mddev
= q
->queuedata
;
223 if (mddev
== NULL
|| mddev
->pers
== NULL
) {
228 if (mddev
->suspended
|| mddev
->barrier
) {
231 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
232 TASK_UNINTERRUPTIBLE
);
233 if (!mddev
->suspended
&& !mddev
->barrier
)
239 finish_wait(&mddev
->sb_wait
, &__wait
);
241 atomic_inc(&mddev
->active_io
);
244 rv
= mddev
->pers
->make_request(mddev
, bio
);
246 cpu
= part_stat_lock();
247 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
248 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
],
252 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
253 wake_up(&mddev
->sb_wait
);
258 /* mddev_suspend makes sure no new requests are submitted
259 * to the device, and that any requests that have been submitted
260 * are completely handled.
261 * Once ->stop is called and completes, the module will be completely
264 static void mddev_suspend(mddev_t
*mddev
)
266 BUG_ON(mddev
->suspended
);
267 mddev
->suspended
= 1;
269 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
270 mddev
->pers
->quiesce(mddev
, 1);
273 static void mddev_resume(mddev_t
*mddev
)
275 mddev
->suspended
= 0;
276 wake_up(&mddev
->sb_wait
);
277 mddev
->pers
->quiesce(mddev
, 0);
280 int mddev_congested(mddev_t
*mddev
, int bits
)
284 return mddev
->suspended
;
286 EXPORT_SYMBOL(mddev_congested
);
289 * Generic barrier handling for md
292 #define POST_REQUEST_BARRIER ((void*)1)
294 static void md_end_barrier(struct bio
*bio
, int err
)
296 mdk_rdev_t
*rdev
= bio
->bi_private
;
297 mddev_t
*mddev
= rdev
->mddev
;
298 if (err
== -EOPNOTSUPP
&& mddev
->barrier
!= POST_REQUEST_BARRIER
)
299 set_bit(BIO_EOPNOTSUPP
, &mddev
->barrier
->bi_flags
);
301 rdev_dec_pending(rdev
, mddev
);
303 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
304 if (mddev
->barrier
== POST_REQUEST_BARRIER
) {
305 /* This was a post-request barrier */
306 mddev
->barrier
= NULL
;
307 wake_up(&mddev
->sb_wait
);
309 /* The pre-request barrier has finished */
310 schedule_work(&mddev
->barrier_work
);
315 static void submit_barriers(mddev_t
*mddev
)
320 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
321 if (rdev
->raid_disk
>= 0 &&
322 !test_bit(Faulty
, &rdev
->flags
)) {
323 /* Take two references, one is dropped
324 * when request finishes, one after
325 * we reclaim rcu_read_lock
328 atomic_inc(&rdev
->nr_pending
);
329 atomic_inc(&rdev
->nr_pending
);
331 bi
= bio_alloc(GFP_KERNEL
, 0);
332 bi
->bi_end_io
= md_end_barrier
;
333 bi
->bi_private
= rdev
;
334 bi
->bi_bdev
= rdev
->bdev
;
335 atomic_inc(&mddev
->flush_pending
);
336 submit_bio(WRITE_BARRIER
, bi
);
338 rdev_dec_pending(rdev
, mddev
);
343 static void md_submit_barrier(struct work_struct
*ws
)
345 mddev_t
*mddev
= container_of(ws
, mddev_t
, barrier_work
);
346 struct bio
*bio
= mddev
->barrier
;
348 atomic_set(&mddev
->flush_pending
, 1);
350 if (test_bit(BIO_EOPNOTSUPP
, &bio
->bi_flags
))
351 bio_endio(bio
, -EOPNOTSUPP
);
352 else if (bio
->bi_size
== 0)
353 /* an empty barrier - all done */
356 bio
->bi_rw
&= ~(1<<BIO_RW_BARRIER
);
357 if (mddev
->pers
->make_request(mddev
, bio
))
358 generic_make_request(bio
);
359 mddev
->barrier
= POST_REQUEST_BARRIER
;
360 submit_barriers(mddev
);
362 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
363 mddev
->barrier
= NULL
;
364 wake_up(&mddev
->sb_wait
);
368 void md_barrier_request(mddev_t
*mddev
, struct bio
*bio
)
370 spin_lock_irq(&mddev
->write_lock
);
371 wait_event_lock_irq(mddev
->sb_wait
,
373 mddev
->write_lock
, /*nothing*/);
374 mddev
->barrier
= bio
;
375 spin_unlock_irq(&mddev
->write_lock
);
377 atomic_set(&mddev
->flush_pending
, 1);
378 INIT_WORK(&mddev
->barrier_work
, md_submit_barrier
);
380 submit_barriers(mddev
);
382 if (atomic_dec_and_test(&mddev
->flush_pending
))
383 schedule_work(&mddev
->barrier_work
);
385 EXPORT_SYMBOL(md_barrier_request
);
387 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
389 atomic_inc(&mddev
->active
);
393 static void mddev_delayed_delete(struct work_struct
*ws
);
395 static void mddev_put(mddev_t
*mddev
)
397 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
399 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
400 mddev
->ctime
== 0 && !mddev
->hold_active
) {
401 /* Array is not configured at all, and not held active,
403 list_del(&mddev
->all_mddevs
);
404 if (mddev
->gendisk
) {
405 /* we did a probe so need to clean up.
406 * Call schedule_work inside the spinlock
407 * so that flush_scheduled_work() after
408 * mddev_find will succeed in waiting for the
411 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
412 schedule_work(&mddev
->del_work
);
416 spin_unlock(&all_mddevs_lock
);
419 static void mddev_init(mddev_t
*mddev
)
421 mutex_init(&mddev
->open_mutex
);
422 mutex_init(&mddev
->reconfig_mutex
);
423 mutex_init(&mddev
->bitmap_info
.mutex
);
424 INIT_LIST_HEAD(&mddev
->disks
);
425 INIT_LIST_HEAD(&mddev
->all_mddevs
);
426 init_timer(&mddev
->safemode_timer
);
427 atomic_set(&mddev
->active
, 1);
428 atomic_set(&mddev
->openers
, 0);
429 atomic_set(&mddev
->active_io
, 0);
430 spin_lock_init(&mddev
->write_lock
);
431 atomic_set(&mddev
->flush_pending
, 0);
432 init_waitqueue_head(&mddev
->sb_wait
);
433 init_waitqueue_head(&mddev
->recovery_wait
);
434 mddev
->reshape_position
= MaxSector
;
435 mddev
->resync_min
= 0;
436 mddev
->resync_max
= MaxSector
;
437 mddev
->level
= LEVEL_NONE
;
440 static mddev_t
* mddev_find(dev_t unit
)
442 mddev_t
*mddev
, *new = NULL
;
445 spin_lock(&all_mddevs_lock
);
448 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
449 if (mddev
->unit
== unit
) {
451 spin_unlock(&all_mddevs_lock
);
457 list_add(&new->all_mddevs
, &all_mddevs
);
458 spin_unlock(&all_mddevs_lock
);
459 new->hold_active
= UNTIL_IOCTL
;
463 /* find an unused unit number */
464 static int next_minor
= 512;
465 int start
= next_minor
;
469 dev
= MKDEV(MD_MAJOR
, next_minor
);
471 if (next_minor
> MINORMASK
)
473 if (next_minor
== start
) {
474 /* Oh dear, all in use. */
475 spin_unlock(&all_mddevs_lock
);
481 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
482 if (mddev
->unit
== dev
) {
488 new->md_minor
= MINOR(dev
);
489 new->hold_active
= UNTIL_STOP
;
490 list_add(&new->all_mddevs
, &all_mddevs
);
491 spin_unlock(&all_mddevs_lock
);
494 spin_unlock(&all_mddevs_lock
);
496 new = kzalloc(sizeof(*new), GFP_KERNEL
);
501 if (MAJOR(unit
) == MD_MAJOR
)
502 new->md_minor
= MINOR(unit
);
504 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
511 static inline int mddev_lock(mddev_t
* mddev
)
513 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
516 static inline int mddev_is_locked(mddev_t
*mddev
)
518 return mutex_is_locked(&mddev
->reconfig_mutex
);
521 static inline int mddev_trylock(mddev_t
* mddev
)
523 return mutex_trylock(&mddev
->reconfig_mutex
);
526 static struct attribute_group md_redundancy_group
;
528 static void mddev_unlock(mddev_t
* mddev
)
530 if (mddev
->to_remove
) {
531 /* These cannot be removed under reconfig_mutex as
532 * an access to the files will try to take reconfig_mutex
533 * while holding the file unremovable, which leads to
535 * So hold open_mutex instead - we are allowed to take
536 * it while holding reconfig_mutex, and md_run can
537 * use it to wait for the remove to complete.
539 struct attribute_group
*to_remove
= mddev
->to_remove
;
540 mddev
->to_remove
= NULL
;
541 mutex_lock(&mddev
->open_mutex
);
542 mutex_unlock(&mddev
->reconfig_mutex
);
544 if (to_remove
!= &md_redundancy_group
)
545 sysfs_remove_group(&mddev
->kobj
, to_remove
);
546 if (mddev
->pers
== NULL
||
547 mddev
->pers
->sync_request
== NULL
) {
548 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
549 if (mddev
->sysfs_action
)
550 sysfs_put(mddev
->sysfs_action
);
551 mddev
->sysfs_action
= NULL
;
553 mutex_unlock(&mddev
->open_mutex
);
555 mutex_unlock(&mddev
->reconfig_mutex
);
557 md_wakeup_thread(mddev
->thread
);
560 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
564 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
565 if (rdev
->desc_nr
== nr
)
571 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
575 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
576 if (rdev
->bdev
->bd_dev
== dev
)
582 static struct mdk_personality
*find_pers(int level
, char *clevel
)
584 struct mdk_personality
*pers
;
585 list_for_each_entry(pers
, &pers_list
, list
) {
586 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
588 if (strcmp(pers
->name
, clevel
)==0)
594 /* return the offset of the super block in 512byte sectors */
595 static inline sector_t
calc_dev_sboffset(struct block_device
*bdev
)
597 sector_t num_sectors
= bdev
->bd_inode
->i_size
/ 512;
598 return MD_NEW_SIZE_SECTORS(num_sectors
);
601 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
606 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
607 if (!rdev
->sb_page
) {
608 printk(KERN_ALERT
"md: out of memory.\n");
615 static void free_disk_sb(mdk_rdev_t
* rdev
)
618 put_page(rdev
->sb_page
);
620 rdev
->sb_page
= NULL
;
627 static void super_written(struct bio
*bio
, int error
)
629 mdk_rdev_t
*rdev
= bio
->bi_private
;
630 mddev_t
*mddev
= rdev
->mddev
;
632 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
633 printk("md: super_written gets error=%d, uptodate=%d\n",
634 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
635 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
636 md_error(mddev
, rdev
);
639 if (atomic_dec_and_test(&mddev
->pending_writes
))
640 wake_up(&mddev
->sb_wait
);
644 static void super_written_barrier(struct bio
*bio
, int error
)
646 struct bio
*bio2
= bio
->bi_private
;
647 mdk_rdev_t
*rdev
= bio2
->bi_private
;
648 mddev_t
*mddev
= rdev
->mddev
;
650 if (!test_bit(BIO_UPTODATE
, &bio
->bi_flags
) &&
651 error
== -EOPNOTSUPP
) {
653 /* barriers don't appear to be supported :-( */
654 set_bit(BarriersNotsupp
, &rdev
->flags
);
655 mddev
->barriers_work
= 0;
656 spin_lock_irqsave(&mddev
->write_lock
, flags
);
657 bio2
->bi_next
= mddev
->biolist
;
658 mddev
->biolist
= bio2
;
659 spin_unlock_irqrestore(&mddev
->write_lock
, flags
);
660 wake_up(&mddev
->sb_wait
);
664 bio
->bi_private
= rdev
;
665 super_written(bio
, error
);
669 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
670 sector_t sector
, int size
, struct page
*page
)
672 /* write first size bytes of page to sector of rdev
673 * Increment mddev->pending_writes before returning
674 * and decrement it on completion, waking up sb_wait
675 * if zero is reached.
676 * If an error occurred, call md_error
678 * As we might need to resubmit the request if BIO_RW_BARRIER
679 * causes ENOTSUPP, we allocate a spare bio...
681 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
682 int rw
= (1<<BIO_RW
) | (1<<BIO_RW_SYNCIO
) | (1<<BIO_RW_UNPLUG
);
684 bio
->bi_bdev
= rdev
->bdev
;
685 bio
->bi_sector
= sector
;
686 bio_add_page(bio
, page
, size
, 0);
687 bio
->bi_private
= rdev
;
688 bio
->bi_end_io
= super_written
;
691 atomic_inc(&mddev
->pending_writes
);
692 if (!test_bit(BarriersNotsupp
, &rdev
->flags
)) {
694 rw
|= (1<<BIO_RW_BARRIER
);
695 rbio
= bio_clone(bio
, GFP_NOIO
);
696 rbio
->bi_private
= bio
;
697 rbio
->bi_end_io
= super_written_barrier
;
698 submit_bio(rw
, rbio
);
703 void md_super_wait(mddev_t
*mddev
)
705 /* wait for all superblock writes that were scheduled to complete.
706 * if any had to be retried (due to BARRIER problems), retry them
710 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
711 if (atomic_read(&mddev
->pending_writes
)==0)
713 while (mddev
->biolist
) {
715 spin_lock_irq(&mddev
->write_lock
);
716 bio
= mddev
->biolist
;
717 mddev
->biolist
= bio
->bi_next
;
719 spin_unlock_irq(&mddev
->write_lock
);
720 submit_bio(bio
->bi_rw
, bio
);
724 finish_wait(&mddev
->sb_wait
, &wq
);
727 static void bi_complete(struct bio
*bio
, int error
)
729 complete((struct completion
*)bio
->bi_private
);
732 int sync_page_io(struct block_device
*bdev
, sector_t sector
, int size
,
733 struct page
*page
, int rw
)
735 struct bio
*bio
= bio_alloc(GFP_NOIO
, 1);
736 struct completion event
;
739 rw
|= (1 << BIO_RW_SYNCIO
) | (1 << BIO_RW_UNPLUG
);
742 bio
->bi_sector
= sector
;
743 bio_add_page(bio
, page
, size
, 0);
744 init_completion(&event
);
745 bio
->bi_private
= &event
;
746 bio
->bi_end_io
= bi_complete
;
748 wait_for_completion(&event
);
750 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
754 EXPORT_SYMBOL_GPL(sync_page_io
);
756 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
758 char b
[BDEVNAME_SIZE
];
759 if (!rdev
->sb_page
) {
767 if (!sync_page_io(rdev
->bdev
, rdev
->sb_start
, size
, rdev
->sb_page
, READ
))
773 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
774 bdevname(rdev
->bdev
,b
));
778 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
780 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
781 sb1
->set_uuid1
== sb2
->set_uuid1
&&
782 sb1
->set_uuid2
== sb2
->set_uuid2
&&
783 sb1
->set_uuid3
== sb2
->set_uuid3
;
786 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
789 mdp_super_t
*tmp1
, *tmp2
;
791 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
792 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
794 if (!tmp1
|| !tmp2
) {
796 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
804 * nr_disks is not constant
809 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
817 static u32
md_csum_fold(u32 csum
)
819 csum
= (csum
& 0xffff) + (csum
>> 16);
820 return (csum
& 0xffff) + (csum
>> 16);
823 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
826 u32
*sb32
= (u32
*)sb
;
828 unsigned int disk_csum
, csum
;
830 disk_csum
= sb
->sb_csum
;
833 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
835 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
839 /* This used to use csum_partial, which was wrong for several
840 * reasons including that different results are returned on
841 * different architectures. It isn't critical that we get exactly
842 * the same return value as before (we always csum_fold before
843 * testing, and that removes any differences). However as we
844 * know that csum_partial always returned a 16bit value on
845 * alphas, do a fold to maximise conformity to previous behaviour.
847 sb
->sb_csum
= md_csum_fold(disk_csum
);
849 sb
->sb_csum
= disk_csum
;
856 * Handle superblock details.
857 * We want to be able to handle multiple superblock formats
858 * so we have a common interface to them all, and an array of
859 * different handlers.
860 * We rely on user-space to write the initial superblock, and support
861 * reading and updating of superblocks.
862 * Interface methods are:
863 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
864 * loads and validates a superblock on dev.
865 * if refdev != NULL, compare superblocks on both devices
867 * 0 - dev has a superblock that is compatible with refdev
868 * 1 - dev has a superblock that is compatible and newer than refdev
869 * so dev should be used as the refdev in future
870 * -EINVAL superblock incompatible or invalid
871 * -othererror e.g. -EIO
873 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
874 * Verify that dev is acceptable into mddev.
875 * The first time, mddev->raid_disks will be 0, and data from
876 * dev should be merged in. Subsequent calls check that dev
877 * is new enough. Return 0 or -EINVAL
879 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
880 * Update the superblock for rdev with data in mddev
881 * This does not write to disc.
887 struct module
*owner
;
888 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
890 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
891 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
892 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
893 sector_t num_sectors
);
897 * Check that the given mddev has no bitmap.
899 * This function is called from the run method of all personalities that do not
900 * support bitmaps. It prints an error message and returns non-zero if mddev
901 * has a bitmap. Otherwise, it returns 0.
904 int md_check_no_bitmap(mddev_t
*mddev
)
906 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
908 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
909 mdname(mddev
), mddev
->pers
->name
);
912 EXPORT_SYMBOL(md_check_no_bitmap
);
915 * load_super for 0.90.0
917 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
919 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
924 * Calculate the position of the superblock (512byte sectors),
925 * it's at the end of the disk.
927 * It also happens to be a multiple of 4Kb.
929 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
931 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
936 bdevname(rdev
->bdev
, b
);
937 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
939 if (sb
->md_magic
!= MD_SB_MAGIC
) {
940 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
945 if (sb
->major_version
!= 0 ||
946 sb
->minor_version
< 90 ||
947 sb
->minor_version
> 91) {
948 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
949 sb
->major_version
, sb
->minor_version
,
954 if (sb
->raid_disks
<= 0)
957 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
958 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
963 rdev
->preferred_minor
= sb
->md_minor
;
964 rdev
->data_offset
= 0;
965 rdev
->sb_size
= MD_SB_BYTES
;
967 if (sb
->level
== LEVEL_MULTIPATH
)
970 rdev
->desc_nr
= sb
->this_disk
.number
;
976 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
977 if (!uuid_equal(refsb
, sb
)) {
978 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
979 b
, bdevname(refdev
->bdev
,b2
));
982 if (!sb_equal(refsb
, sb
)) {
983 printk(KERN_WARNING
"md: %s has same UUID"
984 " but different superblock to %s\n",
985 b
, bdevname(refdev
->bdev
, b2
));
989 ev2
= md_event(refsb
);
995 rdev
->sectors
= rdev
->sb_start
;
997 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
998 /* "this cannot possibly happen" ... */
1006 * validate_super for 0.90.0
1008 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1011 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1012 __u64 ev1
= md_event(sb
);
1014 rdev
->raid_disk
= -1;
1015 clear_bit(Faulty
, &rdev
->flags
);
1016 clear_bit(In_sync
, &rdev
->flags
);
1017 clear_bit(WriteMostly
, &rdev
->flags
);
1018 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1020 if (mddev
->raid_disks
== 0) {
1021 mddev
->major_version
= 0;
1022 mddev
->minor_version
= sb
->minor_version
;
1023 mddev
->patch_version
= sb
->patch_version
;
1024 mddev
->external
= 0;
1025 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1026 mddev
->ctime
= sb
->ctime
;
1027 mddev
->utime
= sb
->utime
;
1028 mddev
->level
= sb
->level
;
1029 mddev
->clevel
[0] = 0;
1030 mddev
->layout
= sb
->layout
;
1031 mddev
->raid_disks
= sb
->raid_disks
;
1032 mddev
->dev_sectors
= sb
->size
* 2;
1033 mddev
->events
= ev1
;
1034 mddev
->bitmap_info
.offset
= 0;
1035 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1037 if (mddev
->minor_version
>= 91) {
1038 mddev
->reshape_position
= sb
->reshape_position
;
1039 mddev
->delta_disks
= sb
->delta_disks
;
1040 mddev
->new_level
= sb
->new_level
;
1041 mddev
->new_layout
= sb
->new_layout
;
1042 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1044 mddev
->reshape_position
= MaxSector
;
1045 mddev
->delta_disks
= 0;
1046 mddev
->new_level
= mddev
->level
;
1047 mddev
->new_layout
= mddev
->layout
;
1048 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1051 if (sb
->state
& (1<<MD_SB_CLEAN
))
1052 mddev
->recovery_cp
= MaxSector
;
1054 if (sb
->events_hi
== sb
->cp_events_hi
&&
1055 sb
->events_lo
== sb
->cp_events_lo
) {
1056 mddev
->recovery_cp
= sb
->recovery_cp
;
1058 mddev
->recovery_cp
= 0;
1061 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1062 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1063 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1064 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1066 mddev
->max_disks
= MD_SB_DISKS
;
1068 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1069 mddev
->bitmap_info
.file
== NULL
)
1070 mddev
->bitmap_info
.offset
=
1071 mddev
->bitmap_info
.default_offset
;
1073 } else if (mddev
->pers
== NULL
) {
1074 /* Insist on good event counter while assembling, except
1075 * for spares (which don't need an event count) */
1077 if (sb
->disks
[rdev
->desc_nr
].state
& (
1078 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1079 if (ev1
< mddev
->events
)
1081 } else if (mddev
->bitmap
) {
1082 /* if adding to array with a bitmap, then we can accept an
1083 * older device ... but not too old.
1085 if (ev1
< mddev
->bitmap
->events_cleared
)
1088 if (ev1
< mddev
->events
)
1089 /* just a hot-add of a new device, leave raid_disk at -1 */
1093 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1094 desc
= sb
->disks
+ rdev
->desc_nr
;
1096 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1097 set_bit(Faulty
, &rdev
->flags
);
1098 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1099 desc->raid_disk < mddev->raid_disks */) {
1100 set_bit(In_sync
, &rdev
->flags
);
1101 rdev
->raid_disk
= desc
->raid_disk
;
1102 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1103 /* active but not in sync implies recovery up to
1104 * reshape position. We don't know exactly where
1105 * that is, so set to zero for now */
1106 if (mddev
->minor_version
>= 91) {
1107 rdev
->recovery_offset
= 0;
1108 rdev
->raid_disk
= desc
->raid_disk
;
1111 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1112 set_bit(WriteMostly
, &rdev
->flags
);
1113 } else /* MULTIPATH are always insync */
1114 set_bit(In_sync
, &rdev
->flags
);
1119 * sync_super for 0.90.0
1121 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1125 int next_spare
= mddev
->raid_disks
;
1128 /* make rdev->sb match mddev data..
1131 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1132 * 3/ any empty disks < next_spare become removed
1134 * disks[0] gets initialised to REMOVED because
1135 * we cannot be sure from other fields if it has
1136 * been initialised or not.
1139 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1141 rdev
->sb_size
= MD_SB_BYTES
;
1143 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1145 memset(sb
, 0, sizeof(*sb
));
1147 sb
->md_magic
= MD_SB_MAGIC
;
1148 sb
->major_version
= mddev
->major_version
;
1149 sb
->patch_version
= mddev
->patch_version
;
1150 sb
->gvalid_words
= 0; /* ignored */
1151 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1152 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1153 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1154 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1156 sb
->ctime
= mddev
->ctime
;
1157 sb
->level
= mddev
->level
;
1158 sb
->size
= mddev
->dev_sectors
/ 2;
1159 sb
->raid_disks
= mddev
->raid_disks
;
1160 sb
->md_minor
= mddev
->md_minor
;
1161 sb
->not_persistent
= 0;
1162 sb
->utime
= mddev
->utime
;
1164 sb
->events_hi
= (mddev
->events
>>32);
1165 sb
->events_lo
= (u32
)mddev
->events
;
1167 if (mddev
->reshape_position
== MaxSector
)
1168 sb
->minor_version
= 90;
1170 sb
->minor_version
= 91;
1171 sb
->reshape_position
= mddev
->reshape_position
;
1172 sb
->new_level
= mddev
->new_level
;
1173 sb
->delta_disks
= mddev
->delta_disks
;
1174 sb
->new_layout
= mddev
->new_layout
;
1175 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1177 mddev
->minor_version
= sb
->minor_version
;
1180 sb
->recovery_cp
= mddev
->recovery_cp
;
1181 sb
->cp_events_hi
= (mddev
->events
>>32);
1182 sb
->cp_events_lo
= (u32
)mddev
->events
;
1183 if (mddev
->recovery_cp
== MaxSector
)
1184 sb
->state
= (1<< MD_SB_CLEAN
);
1186 sb
->recovery_cp
= 0;
1188 sb
->layout
= mddev
->layout
;
1189 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1191 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1192 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1194 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1195 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1198 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1200 if (rdev2
->raid_disk
>= 0 &&
1201 sb
->minor_version
>= 91)
1202 /* we have nowhere to store the recovery_offset,
1203 * but if it is not below the reshape_position,
1204 * we can piggy-back on that.
1207 if (rdev2
->raid_disk
< 0 ||
1208 test_bit(Faulty
, &rdev2
->flags
))
1211 desc_nr
= rdev2
->raid_disk
;
1213 desc_nr
= next_spare
++;
1214 rdev2
->desc_nr
= desc_nr
;
1215 d
= &sb
->disks
[rdev2
->desc_nr
];
1217 d
->number
= rdev2
->desc_nr
;
1218 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1219 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1221 d
->raid_disk
= rdev2
->raid_disk
;
1223 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1224 if (test_bit(Faulty
, &rdev2
->flags
))
1225 d
->state
= (1<<MD_DISK_FAULTY
);
1226 else if (is_active
) {
1227 d
->state
= (1<<MD_DISK_ACTIVE
);
1228 if (test_bit(In_sync
, &rdev2
->flags
))
1229 d
->state
|= (1<<MD_DISK_SYNC
);
1237 if (test_bit(WriteMostly
, &rdev2
->flags
))
1238 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1240 /* now set the "removed" and "faulty" bits on any missing devices */
1241 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1242 mdp_disk_t
*d
= &sb
->disks
[i
];
1243 if (d
->state
== 0 && d
->number
== 0) {
1246 d
->state
= (1<<MD_DISK_REMOVED
);
1247 d
->state
|= (1<<MD_DISK_FAULTY
);
1251 sb
->nr_disks
= nr_disks
;
1252 sb
->active_disks
= active
;
1253 sb
->working_disks
= working
;
1254 sb
->failed_disks
= failed
;
1255 sb
->spare_disks
= spare
;
1257 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1258 sb
->sb_csum
= calc_sb_csum(sb
);
1262 * rdev_size_change for 0.90.0
1264 static unsigned long long
1265 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1267 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1268 return 0; /* component must fit device */
1269 if (rdev
->mddev
->bitmap_info
.offset
)
1270 return 0; /* can't move bitmap */
1271 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
1272 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1273 num_sectors
= rdev
->sb_start
;
1274 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1276 md_super_wait(rdev
->mddev
);
1277 return num_sectors
/ 2; /* kB for sysfs */
1282 * version 1 superblock
1285 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1289 unsigned long long newcsum
;
1290 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1291 __le32
*isuper
= (__le32
*)sb
;
1294 disk_csum
= sb
->sb_csum
;
1297 for (i
=0; size
>=4; size
-= 4 )
1298 newcsum
+= le32_to_cpu(*isuper
++);
1301 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1303 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1304 sb
->sb_csum
= disk_csum
;
1305 return cpu_to_le32(csum
);
1308 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1310 struct mdp_superblock_1
*sb
;
1313 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1317 * Calculate the position of the superblock in 512byte sectors.
1318 * It is always aligned to a 4K boundary and
1319 * depeding on minor_version, it can be:
1320 * 0: At least 8K, but less than 12K, from end of device
1321 * 1: At start of device
1322 * 2: 4K from start of device.
1324 switch(minor_version
) {
1326 sb_start
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1328 sb_start
&= ~(sector_t
)(4*2-1);
1339 rdev
->sb_start
= sb_start
;
1341 /* superblock is rarely larger than 1K, but it can be larger,
1342 * and it is safe to read 4k, so we do that
1344 ret
= read_disk_sb(rdev
, 4096);
1345 if (ret
) return ret
;
1348 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1350 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1351 sb
->major_version
!= cpu_to_le32(1) ||
1352 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1353 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1354 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1357 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1358 printk("md: invalid superblock checksum on %s\n",
1359 bdevname(rdev
->bdev
,b
));
1362 if (le64_to_cpu(sb
->data_size
) < 10) {
1363 printk("md: data_size too small on %s\n",
1364 bdevname(rdev
->bdev
,b
));
1368 rdev
->preferred_minor
= 0xffff;
1369 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1370 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1372 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1373 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1374 if (rdev
->sb_size
& bmask
)
1375 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1378 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1381 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1384 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1390 struct mdp_superblock_1
*refsb
=
1391 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1393 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1394 sb
->level
!= refsb
->level
||
1395 sb
->layout
!= refsb
->layout
||
1396 sb
->chunksize
!= refsb
->chunksize
) {
1397 printk(KERN_WARNING
"md: %s has strangely different"
1398 " superblock to %s\n",
1399 bdevname(rdev
->bdev
,b
),
1400 bdevname(refdev
->bdev
,b2
));
1403 ev1
= le64_to_cpu(sb
->events
);
1404 ev2
= le64_to_cpu(refsb
->events
);
1412 rdev
->sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
1413 le64_to_cpu(sb
->data_offset
);
1415 rdev
->sectors
= rdev
->sb_start
;
1416 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1418 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1419 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1424 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1426 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1427 __u64 ev1
= le64_to_cpu(sb
->events
);
1429 rdev
->raid_disk
= -1;
1430 clear_bit(Faulty
, &rdev
->flags
);
1431 clear_bit(In_sync
, &rdev
->flags
);
1432 clear_bit(WriteMostly
, &rdev
->flags
);
1433 clear_bit(BarriersNotsupp
, &rdev
->flags
);
1435 if (mddev
->raid_disks
== 0) {
1436 mddev
->major_version
= 1;
1437 mddev
->patch_version
= 0;
1438 mddev
->external
= 0;
1439 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1440 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1441 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1442 mddev
->level
= le32_to_cpu(sb
->level
);
1443 mddev
->clevel
[0] = 0;
1444 mddev
->layout
= le32_to_cpu(sb
->layout
);
1445 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1446 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1447 mddev
->events
= ev1
;
1448 mddev
->bitmap_info
.offset
= 0;
1449 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1451 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1452 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1454 mddev
->max_disks
= (4096-256)/2;
1456 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1457 mddev
->bitmap_info
.file
== NULL
)
1458 mddev
->bitmap_info
.offset
=
1459 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1461 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1462 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1463 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1464 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1465 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1466 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1468 mddev
->reshape_position
= MaxSector
;
1469 mddev
->delta_disks
= 0;
1470 mddev
->new_level
= mddev
->level
;
1471 mddev
->new_layout
= mddev
->layout
;
1472 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1475 } else if (mddev
->pers
== NULL
) {
1476 /* Insist of good event counter while assembling, except for
1477 * spares (which don't need an event count) */
1479 if (rdev
->desc_nr
>= 0 &&
1480 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1481 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1482 if (ev1
< mddev
->events
)
1484 } else if (mddev
->bitmap
) {
1485 /* If adding to array with a bitmap, then we can accept an
1486 * older device, but not too old.
1488 if (ev1
< mddev
->bitmap
->events_cleared
)
1491 if (ev1
< mddev
->events
)
1492 /* just a hot-add of a new device, leave raid_disk at -1 */
1495 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1497 if (rdev
->desc_nr
< 0 ||
1498 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1502 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1504 case 0xffff: /* spare */
1506 case 0xfffe: /* faulty */
1507 set_bit(Faulty
, &rdev
->flags
);
1510 if ((le32_to_cpu(sb
->feature_map
) &
1511 MD_FEATURE_RECOVERY_OFFSET
))
1512 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1514 set_bit(In_sync
, &rdev
->flags
);
1515 rdev
->raid_disk
= role
;
1518 if (sb
->devflags
& WriteMostly1
)
1519 set_bit(WriteMostly
, &rdev
->flags
);
1520 } else /* MULTIPATH are always insync */
1521 set_bit(In_sync
, &rdev
->flags
);
1526 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1528 struct mdp_superblock_1
*sb
;
1531 /* make rdev->sb match mddev and rdev data. */
1533 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1535 sb
->feature_map
= 0;
1537 sb
->recovery_offset
= cpu_to_le64(0);
1538 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1539 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1540 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1542 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1543 sb
->events
= cpu_to_le64(mddev
->events
);
1545 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1547 sb
->resync_offset
= cpu_to_le64(0);
1549 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1551 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1552 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1553 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1554 sb
->level
= cpu_to_le32(mddev
->level
);
1555 sb
->layout
= cpu_to_le32(mddev
->layout
);
1557 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1558 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1559 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1562 if (rdev
->raid_disk
>= 0 &&
1563 !test_bit(In_sync
, &rdev
->flags
)) {
1565 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1566 sb
->recovery_offset
=
1567 cpu_to_le64(rdev
->recovery_offset
);
1570 if (mddev
->reshape_position
!= MaxSector
) {
1571 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1572 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1573 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1574 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1575 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1576 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1580 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1581 if (rdev2
->desc_nr
+1 > max_dev
)
1582 max_dev
= rdev2
->desc_nr
+1;
1584 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1586 sb
->max_dev
= cpu_to_le32(max_dev
);
1587 rdev
->sb_size
= max_dev
* 2 + 256;
1588 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1589 if (rdev
->sb_size
& bmask
)
1590 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1592 for (i
=0; i
<max_dev
;i
++)
1593 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1595 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1597 if (test_bit(Faulty
, &rdev2
->flags
))
1598 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1599 else if (test_bit(In_sync
, &rdev2
->flags
))
1600 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1601 else if (rdev2
->raid_disk
>= 0)
1602 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1604 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1607 sb
->sb_csum
= calc_sb_1_csum(sb
);
1610 static unsigned long long
1611 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1613 struct mdp_superblock_1
*sb
;
1614 sector_t max_sectors
;
1615 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1616 return 0; /* component must fit device */
1617 if (rdev
->sb_start
< rdev
->data_offset
) {
1618 /* minor versions 1 and 2; superblock before data */
1619 max_sectors
= rdev
->bdev
->bd_inode
->i_size
>> 9;
1620 max_sectors
-= rdev
->data_offset
;
1621 if (!num_sectors
|| num_sectors
> max_sectors
)
1622 num_sectors
= max_sectors
;
1623 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1624 /* minor version 0 with bitmap we can't move */
1627 /* minor version 0; superblock after data */
1629 sb_start
= (rdev
->bdev
->bd_inode
->i_size
>> 9) - 8*2;
1630 sb_start
&= ~(sector_t
)(4*2 - 1);
1631 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1632 if (!num_sectors
|| num_sectors
> max_sectors
)
1633 num_sectors
= max_sectors
;
1634 rdev
->sb_start
= sb_start
;
1636 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1637 sb
->data_size
= cpu_to_le64(num_sectors
);
1638 sb
->super_offset
= rdev
->sb_start
;
1639 sb
->sb_csum
= calc_sb_1_csum(sb
);
1640 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1642 md_super_wait(rdev
->mddev
);
1643 return num_sectors
/ 2; /* kB for sysfs */
1646 static struct super_type super_types
[] = {
1649 .owner
= THIS_MODULE
,
1650 .load_super
= super_90_load
,
1651 .validate_super
= super_90_validate
,
1652 .sync_super
= super_90_sync
,
1653 .rdev_size_change
= super_90_rdev_size_change
,
1657 .owner
= THIS_MODULE
,
1658 .load_super
= super_1_load
,
1659 .validate_super
= super_1_validate
,
1660 .sync_super
= super_1_sync
,
1661 .rdev_size_change
= super_1_rdev_size_change
,
1665 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1667 mdk_rdev_t
*rdev
, *rdev2
;
1670 rdev_for_each_rcu(rdev
, mddev1
)
1671 rdev_for_each_rcu(rdev2
, mddev2
)
1672 if (rdev
->bdev
->bd_contains
==
1673 rdev2
->bdev
->bd_contains
) {
1681 static LIST_HEAD(pending_raid_disks
);
1684 * Try to register data integrity profile for an mddev
1686 * This is called when an array is started and after a disk has been kicked
1687 * from the array. It only succeeds if all working and active component devices
1688 * are integrity capable with matching profiles.
1690 int md_integrity_register(mddev_t
*mddev
)
1692 mdk_rdev_t
*rdev
, *reference
= NULL
;
1694 if (list_empty(&mddev
->disks
))
1695 return 0; /* nothing to do */
1696 if (blk_get_integrity(mddev
->gendisk
))
1697 return 0; /* already registered */
1698 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1699 /* skip spares and non-functional disks */
1700 if (test_bit(Faulty
, &rdev
->flags
))
1702 if (rdev
->raid_disk
< 0)
1705 * If at least one rdev is not integrity capable, we can not
1706 * enable data integrity for the md device.
1708 if (!bdev_get_integrity(rdev
->bdev
))
1711 /* Use the first rdev as the reference */
1715 /* does this rdev's profile match the reference profile? */
1716 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1717 rdev
->bdev
->bd_disk
) < 0)
1721 * All component devices are integrity capable and have matching
1722 * profiles, register the common profile for the md device.
1724 if (blk_integrity_register(mddev
->gendisk
,
1725 bdev_get_integrity(reference
->bdev
)) != 0) {
1726 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1730 printk(KERN_NOTICE
"md: data integrity on %s enabled\n",
1734 EXPORT_SYMBOL(md_integrity_register
);
1736 /* Disable data integrity if non-capable/non-matching disk is being added */
1737 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1739 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1740 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1742 if (!bi_mddev
) /* nothing to do */
1744 if (rdev
->raid_disk
< 0) /* skip spares */
1746 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1747 rdev
->bdev
->bd_disk
) >= 0)
1749 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1750 blk_integrity_unregister(mddev
->gendisk
);
1752 EXPORT_SYMBOL(md_integrity_add_rdev
);
1754 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1756 char b
[BDEVNAME_SIZE
];
1766 /* prevent duplicates */
1767 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1770 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1771 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1772 rdev
->sectors
< mddev
->dev_sectors
)) {
1774 /* Cannot change size, so fail
1775 * If mddev->level <= 0, then we don't care
1776 * about aligning sizes (e.g. linear)
1778 if (mddev
->level
> 0)
1781 mddev
->dev_sectors
= rdev
->sectors
;
1784 /* Verify rdev->desc_nr is unique.
1785 * If it is -1, assign a free number, else
1786 * check number is not in use
1788 if (rdev
->desc_nr
< 0) {
1790 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1791 while (find_rdev_nr(mddev
, choice
))
1793 rdev
->desc_nr
= choice
;
1795 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1798 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1799 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1800 mdname(mddev
), mddev
->max_disks
);
1803 bdevname(rdev
->bdev
,b
);
1804 while ( (s
=strchr(b
, '/')) != NULL
)
1807 rdev
->mddev
= mddev
;
1808 printk(KERN_INFO
"md: bind<%s>\n", b
);
1810 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1813 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1814 if ((err
= sysfs_create_link(&rdev
->kobj
, ko
, "block"))) {
1815 kobject_del(&rdev
->kobj
);
1818 rdev
->sysfs_state
= sysfs_get_dirent(rdev
->kobj
.sd
, NULL
, "state");
1820 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1821 bd_claim_by_disk(rdev
->bdev
, rdev
->bdev
->bd_holder
, mddev
->gendisk
);
1823 /* May as well allow recovery to be retried once */
1824 mddev
->recovery_disabled
= 0;
1829 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1834 static void md_delayed_delete(struct work_struct
*ws
)
1836 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1837 kobject_del(&rdev
->kobj
);
1838 kobject_put(&rdev
->kobj
);
1841 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1843 char b
[BDEVNAME_SIZE
];
1848 bd_release_from_disk(rdev
->bdev
, rdev
->mddev
->gendisk
);
1849 list_del_rcu(&rdev
->same_set
);
1850 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1852 sysfs_remove_link(&rdev
->kobj
, "block");
1853 sysfs_put(rdev
->sysfs_state
);
1854 rdev
->sysfs_state
= NULL
;
1855 /* We need to delay this, otherwise we can deadlock when
1856 * writing to 'remove' to "dev/state". We also need
1857 * to delay it due to rcu usage.
1860 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1861 kobject_get(&rdev
->kobj
);
1862 schedule_work(&rdev
->del_work
);
1866 * prevent the device from being mounted, repartitioned or
1867 * otherwise reused by a RAID array (or any other kernel
1868 * subsystem), by bd_claiming the device.
1870 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1873 struct block_device
*bdev
;
1874 char b
[BDEVNAME_SIZE
];
1876 bdev
= open_by_devnum(dev
, FMODE_READ
|FMODE_WRITE
);
1878 printk(KERN_ERR
"md: could not open %s.\n",
1879 __bdevname(dev
, b
));
1880 return PTR_ERR(bdev
);
1882 err
= bd_claim(bdev
, shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1884 printk(KERN_ERR
"md: could not bd_claim %s.\n",
1886 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1890 set_bit(AllReserved
, &rdev
->flags
);
1895 static void unlock_rdev(mdk_rdev_t
*rdev
)
1897 struct block_device
*bdev
= rdev
->bdev
;
1902 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
);
1905 void md_autodetect_dev(dev_t dev
);
1907 static void export_rdev(mdk_rdev_t
* rdev
)
1909 char b
[BDEVNAME_SIZE
];
1910 printk(KERN_INFO
"md: export_rdev(%s)\n",
1911 bdevname(rdev
->bdev
,b
));
1916 if (test_bit(AutoDetected
, &rdev
->flags
))
1917 md_autodetect_dev(rdev
->bdev
->bd_dev
);
1920 kobject_put(&rdev
->kobj
);
1923 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
1925 unbind_rdev_from_array(rdev
);
1929 static void export_array(mddev_t
*mddev
)
1931 mdk_rdev_t
*rdev
, *tmp
;
1933 rdev_for_each(rdev
, tmp
, mddev
) {
1938 kick_rdev_from_array(rdev
);
1940 if (!list_empty(&mddev
->disks
))
1942 mddev
->raid_disks
= 0;
1943 mddev
->major_version
= 0;
1946 static void print_desc(mdp_disk_t
*desc
)
1948 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
1949 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
1952 static void print_sb_90(mdp_super_t
*sb
)
1957 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1958 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
1959 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
1961 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1962 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
1963 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
1964 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
1965 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1966 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
1967 sb
->failed_disks
, sb
->spare_disks
,
1968 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
1971 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
1974 desc
= sb
->disks
+ i
;
1975 if (desc
->number
|| desc
->major
|| desc
->minor
||
1976 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
1977 printk(" D %2d: ", i
);
1981 printk(KERN_INFO
"md: THIS: ");
1982 print_desc(&sb
->this_disk
);
1985 static void print_sb_1(struct mdp_superblock_1
*sb
)
1989 uuid
= sb
->set_uuid
;
1991 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
1992 "md: Name: \"%s\" CT:%llu\n",
1993 le32_to_cpu(sb
->major_version
),
1994 le32_to_cpu(sb
->feature_map
),
1997 (unsigned long long)le64_to_cpu(sb
->ctime
)
1998 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2000 uuid
= sb
->device_uuid
;
2002 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2004 "md: Dev:%08x UUID: %pU\n"
2005 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2006 "md: (MaxDev:%u) \n",
2007 le32_to_cpu(sb
->level
),
2008 (unsigned long long)le64_to_cpu(sb
->size
),
2009 le32_to_cpu(sb
->raid_disks
),
2010 le32_to_cpu(sb
->layout
),
2011 le32_to_cpu(sb
->chunksize
),
2012 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2013 (unsigned long long)le64_to_cpu(sb
->data_size
),
2014 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2015 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2016 le32_to_cpu(sb
->dev_number
),
2019 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2020 (unsigned long long)le64_to_cpu(sb
->events
),
2021 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2022 le32_to_cpu(sb
->sb_csum
),
2023 le32_to_cpu(sb
->max_dev
)
2027 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2029 char b
[BDEVNAME_SIZE
];
2030 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2031 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2032 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2034 if (rdev
->sb_loaded
) {
2035 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2036 switch (major_version
) {
2038 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2041 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2045 printk(KERN_INFO
"md: no rdev superblock!\n");
2048 static void md_print_devices(void)
2050 struct list_head
*tmp
;
2053 char b
[BDEVNAME_SIZE
];
2056 printk("md: **********************************\n");
2057 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2058 printk("md: **********************************\n");
2059 for_each_mddev(mddev
, tmp
) {
2062 bitmap_print_sb(mddev
->bitmap
);
2064 printk("%s: ", mdname(mddev
));
2065 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2066 printk("<%s>", bdevname(rdev
->bdev
,b
));
2069 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2070 print_rdev(rdev
, mddev
->major_version
);
2072 printk("md: **********************************\n");
2077 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2079 /* Update each superblock (in-memory image), but
2080 * if we are allowed to, skip spares which already
2081 * have the right event counter, or have one earlier
2082 * (which would mean they aren't being marked as dirty
2083 * with the rest of the array)
2087 /* First make sure individual recovery_offsets are correct */
2088 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2089 if (rdev
->raid_disk
>= 0 &&
2090 !test_bit(In_sync
, &rdev
->flags
) &&
2091 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2092 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2095 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2096 if (rdev
->sb_events
== mddev
->events
||
2098 rdev
->raid_disk
< 0 &&
2099 rdev
->sb_events
+1 == mddev
->events
)) {
2100 /* Don't update this superblock */
2101 rdev
->sb_loaded
= 2;
2103 super_types
[mddev
->major_version
].
2104 sync_super(mddev
, rdev
);
2105 rdev
->sb_loaded
= 1;
2110 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2116 mddev
->utime
= get_seconds();
2117 if (mddev
->external
)
2120 spin_lock_irq(&mddev
->write_lock
);
2122 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2123 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2125 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2126 /* just a clean<-> dirty transition, possibly leave spares alone,
2127 * though if events isn't the right even/odd, we will have to do
2133 if (mddev
->degraded
)
2134 /* If the array is degraded, then skipping spares is both
2135 * dangerous and fairly pointless.
2136 * Dangerous because a device that was removed from the array
2137 * might have a event_count that still looks up-to-date,
2138 * so it can be re-added without a resync.
2139 * Pointless because if there are any spares to skip,
2140 * then a recovery will happen and soon that array won't
2141 * be degraded any more and the spare can go back to sleep then.
2145 sync_req
= mddev
->in_sync
;
2147 /* If this is just a dirty<->clean transition, and the array is clean
2148 * and 'events' is odd, we can roll back to the previous clean state */
2150 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2151 && mddev
->can_decrease_events
2152 && mddev
->events
!= 1) {
2154 mddev
->can_decrease_events
= 0;
2156 /* otherwise we have to go forward and ... */
2158 mddev
->can_decrease_events
= nospares
;
2161 if (!mddev
->events
) {
2163 * oops, this 64-bit counter should never wrap.
2164 * Either we are in around ~1 trillion A.C., assuming
2165 * 1 reboot per second, or we have a bug:
2172 * do not write anything to disk if using
2173 * nonpersistent superblocks
2175 if (!mddev
->persistent
) {
2176 if (!mddev
->external
)
2177 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2179 spin_unlock_irq(&mddev
->write_lock
);
2180 wake_up(&mddev
->sb_wait
);
2183 sync_sbs(mddev
, nospares
);
2184 spin_unlock_irq(&mddev
->write_lock
);
2187 "md: updating %s RAID superblock on device (in sync %d)\n",
2188 mdname(mddev
),mddev
->in_sync
);
2190 bitmap_update_sb(mddev
->bitmap
);
2191 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2192 char b
[BDEVNAME_SIZE
];
2193 dprintk(KERN_INFO
"md: ");
2194 if (rdev
->sb_loaded
!= 1)
2195 continue; /* no noise on spare devices */
2196 if (test_bit(Faulty
, &rdev
->flags
))
2197 dprintk("(skipping faulty ");
2199 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2200 if (!test_bit(Faulty
, &rdev
->flags
)) {
2201 md_super_write(mddev
,rdev
,
2202 rdev
->sb_start
, rdev
->sb_size
,
2204 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2205 bdevname(rdev
->bdev
,b
),
2206 (unsigned long long)rdev
->sb_start
);
2207 rdev
->sb_events
= mddev
->events
;
2211 if (mddev
->level
== LEVEL_MULTIPATH
)
2212 /* only need to write one superblock... */
2215 md_super_wait(mddev
);
2216 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2218 spin_lock_irq(&mddev
->write_lock
);
2219 if (mddev
->in_sync
!= sync_req
||
2220 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2221 /* have to write it out again */
2222 spin_unlock_irq(&mddev
->write_lock
);
2225 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2226 spin_unlock_irq(&mddev
->write_lock
);
2227 wake_up(&mddev
->sb_wait
);
2228 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2229 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2233 /* words written to sysfs files may, or may not, be \n terminated.
2234 * We want to accept with case. For this we use cmd_match.
2236 static int cmd_match(const char *cmd
, const char *str
)
2238 /* See if cmd, written into a sysfs file, matches
2239 * str. They must either be the same, or cmd can
2240 * have a trailing newline
2242 while (*cmd
&& *str
&& *cmd
== *str
) {
2253 struct rdev_sysfs_entry
{
2254 struct attribute attr
;
2255 ssize_t (*show
)(mdk_rdev_t
*, char *);
2256 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2260 state_show(mdk_rdev_t
*rdev
, char *page
)
2265 if (test_bit(Faulty
, &rdev
->flags
)) {
2266 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2269 if (test_bit(In_sync
, &rdev
->flags
)) {
2270 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2273 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2274 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2277 if (test_bit(Blocked
, &rdev
->flags
)) {
2278 len
+= sprintf(page
+len
, "%sblocked", sep
);
2281 if (!test_bit(Faulty
, &rdev
->flags
) &&
2282 !test_bit(In_sync
, &rdev
->flags
)) {
2283 len
+= sprintf(page
+len
, "%sspare", sep
);
2286 return len
+sprintf(page
+len
, "\n");
2290 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2293 * faulty - simulates and error
2294 * remove - disconnects the device
2295 * writemostly - sets write_mostly
2296 * -writemostly - clears write_mostly
2297 * blocked - sets the Blocked flag
2298 * -blocked - clears the Blocked flag
2299 * insync - sets Insync providing device isn't active
2302 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2303 md_error(rdev
->mddev
, rdev
);
2305 } else if (cmd_match(buf
, "remove")) {
2306 if (rdev
->raid_disk
>= 0)
2309 mddev_t
*mddev
= rdev
->mddev
;
2310 kick_rdev_from_array(rdev
);
2312 md_update_sb(mddev
, 1);
2313 md_new_event(mddev
);
2316 } else if (cmd_match(buf
, "writemostly")) {
2317 set_bit(WriteMostly
, &rdev
->flags
);
2319 } else if (cmd_match(buf
, "-writemostly")) {
2320 clear_bit(WriteMostly
, &rdev
->flags
);
2322 } else if (cmd_match(buf
, "blocked")) {
2323 set_bit(Blocked
, &rdev
->flags
);
2325 } else if (cmd_match(buf
, "-blocked")) {
2326 clear_bit(Blocked
, &rdev
->flags
);
2327 wake_up(&rdev
->blocked_wait
);
2328 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2329 md_wakeup_thread(rdev
->mddev
->thread
);
2332 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2333 set_bit(In_sync
, &rdev
->flags
);
2336 if (!err
&& rdev
->sysfs_state
)
2337 sysfs_notify_dirent(rdev
->sysfs_state
);
2338 return err
? err
: len
;
2340 static struct rdev_sysfs_entry rdev_state
=
2341 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2344 errors_show(mdk_rdev_t
*rdev
, char *page
)
2346 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2350 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2353 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2354 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2355 atomic_set(&rdev
->corrected_errors
, n
);
2360 static struct rdev_sysfs_entry rdev_errors
=
2361 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2364 slot_show(mdk_rdev_t
*rdev
, char *page
)
2366 if (rdev
->raid_disk
< 0)
2367 return sprintf(page
, "none\n");
2369 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2373 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2378 int slot
= simple_strtoul(buf
, &e
, 10);
2379 if (strncmp(buf
, "none", 4)==0)
2381 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2383 if (rdev
->mddev
->pers
&& slot
== -1) {
2384 /* Setting 'slot' on an active array requires also
2385 * updating the 'rd%d' link, and communicating
2386 * with the personality with ->hot_*_disk.
2387 * For now we only support removing
2388 * failed/spare devices. This normally happens automatically,
2389 * but not when the metadata is externally managed.
2391 if (rdev
->raid_disk
== -1)
2393 /* personality does all needed checks */
2394 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2396 err
= rdev
->mddev
->pers
->
2397 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2400 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2401 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2402 rdev
->raid_disk
= -1;
2403 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2404 md_wakeup_thread(rdev
->mddev
->thread
);
2405 } else if (rdev
->mddev
->pers
) {
2407 /* Activating a spare .. or possibly reactivating
2408 * if we ever get bitmaps working here.
2411 if (rdev
->raid_disk
!= -1)
2414 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2417 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2418 if (rdev2
->raid_disk
== slot
)
2421 rdev
->raid_disk
= slot
;
2422 if (test_bit(In_sync
, &rdev
->flags
))
2423 rdev
->saved_raid_disk
= slot
;
2425 rdev
->saved_raid_disk
= -1;
2426 err
= rdev
->mddev
->pers
->
2427 hot_add_disk(rdev
->mddev
, rdev
);
2429 rdev
->raid_disk
= -1;
2432 sysfs_notify_dirent(rdev
->sysfs_state
);
2433 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2434 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2436 "md: cannot register "
2438 nm
, mdname(rdev
->mddev
));
2440 /* don't wakeup anyone, leave that to userspace. */
2442 if (slot
>= rdev
->mddev
->raid_disks
)
2444 rdev
->raid_disk
= slot
;
2445 /* assume it is working */
2446 clear_bit(Faulty
, &rdev
->flags
);
2447 clear_bit(WriteMostly
, &rdev
->flags
);
2448 set_bit(In_sync
, &rdev
->flags
);
2449 sysfs_notify_dirent(rdev
->sysfs_state
);
2455 static struct rdev_sysfs_entry rdev_slot
=
2456 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2459 offset_show(mdk_rdev_t
*rdev
, char *page
)
2461 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2465 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2468 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2469 if (e
==buf
|| (*e
&& *e
!= '\n'))
2471 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2473 if (rdev
->sectors
&& rdev
->mddev
->external
)
2474 /* Must set offset before size, so overlap checks
2477 rdev
->data_offset
= offset
;
2481 static struct rdev_sysfs_entry rdev_offset
=
2482 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2485 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2487 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2490 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2492 /* check if two start/length pairs overlap */
2500 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2502 unsigned long long blocks
;
2505 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2508 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2509 return -EINVAL
; /* sector conversion overflow */
2512 if (new != blocks
* 2)
2513 return -EINVAL
; /* unsigned long long to sector_t overflow */
2520 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2522 mddev_t
*my_mddev
= rdev
->mddev
;
2523 sector_t oldsectors
= rdev
->sectors
;
2526 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2528 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2529 if (my_mddev
->persistent
) {
2530 sectors
= super_types
[my_mddev
->major_version
].
2531 rdev_size_change(rdev
, sectors
);
2534 } else if (!sectors
)
2535 sectors
= (rdev
->bdev
->bd_inode
->i_size
>> 9) -
2538 if (sectors
< my_mddev
->dev_sectors
)
2539 return -EINVAL
; /* component must fit device */
2541 rdev
->sectors
= sectors
;
2542 if (sectors
> oldsectors
&& my_mddev
->external
) {
2543 /* need to check that all other rdevs with the same ->bdev
2544 * do not overlap. We need to unlock the mddev to avoid
2545 * a deadlock. We have already changed rdev->sectors, and if
2546 * we have to change it back, we will have the lock again.
2550 struct list_head
*tmp
;
2552 mddev_unlock(my_mddev
);
2553 for_each_mddev(mddev
, tmp
) {
2557 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2558 if (test_bit(AllReserved
, &rdev2
->flags
) ||
2559 (rdev
->bdev
== rdev2
->bdev
&&
2561 overlaps(rdev
->data_offset
, rdev
->sectors
,
2567 mddev_unlock(mddev
);
2573 mddev_lock(my_mddev
);
2575 /* Someone else could have slipped in a size
2576 * change here, but doing so is just silly.
2577 * We put oldsectors back because we *know* it is
2578 * safe, and trust userspace not to race with
2581 rdev
->sectors
= oldsectors
;
2588 static struct rdev_sysfs_entry rdev_size
=
2589 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2592 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2594 unsigned long long recovery_start
= rdev
->recovery_offset
;
2596 if (test_bit(In_sync
, &rdev
->flags
) ||
2597 recovery_start
== MaxSector
)
2598 return sprintf(page
, "none\n");
2600 return sprintf(page
, "%llu\n", recovery_start
);
2603 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2605 unsigned long long recovery_start
;
2607 if (cmd_match(buf
, "none"))
2608 recovery_start
= MaxSector
;
2609 else if (strict_strtoull(buf
, 10, &recovery_start
))
2612 if (rdev
->mddev
->pers
&&
2613 rdev
->raid_disk
>= 0)
2616 rdev
->recovery_offset
= recovery_start
;
2617 if (recovery_start
== MaxSector
)
2618 set_bit(In_sync
, &rdev
->flags
);
2620 clear_bit(In_sync
, &rdev
->flags
);
2624 static struct rdev_sysfs_entry rdev_recovery_start
=
2625 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2627 static struct attribute
*rdev_default_attrs
[] = {
2633 &rdev_recovery_start
.attr
,
2637 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2639 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2640 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2641 mddev_t
*mddev
= rdev
->mddev
;
2647 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2649 if (rdev
->mddev
== NULL
)
2652 rv
= entry
->show(rdev
, page
);
2653 mddev_unlock(mddev
);
2659 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2660 const char *page
, size_t length
)
2662 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2663 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2665 mddev_t
*mddev
= rdev
->mddev
;
2669 if (!capable(CAP_SYS_ADMIN
))
2671 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2673 if (rdev
->mddev
== NULL
)
2676 rv
= entry
->store(rdev
, page
, length
);
2677 mddev_unlock(mddev
);
2682 static void rdev_free(struct kobject
*ko
)
2684 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2687 static const struct sysfs_ops rdev_sysfs_ops
= {
2688 .show
= rdev_attr_show
,
2689 .store
= rdev_attr_store
,
2691 static struct kobj_type rdev_ktype
= {
2692 .release
= rdev_free
,
2693 .sysfs_ops
= &rdev_sysfs_ops
,
2694 .default_attrs
= rdev_default_attrs
,
2698 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2700 * mark the device faulty if:
2702 * - the device is nonexistent (zero size)
2703 * - the device has no valid superblock
2705 * a faulty rdev _never_ has rdev->sb set.
2707 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2709 char b
[BDEVNAME_SIZE
];
2714 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2716 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2717 return ERR_PTR(-ENOMEM
);
2720 if ((err
= alloc_disk_sb(rdev
)))
2723 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2727 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2730 rdev
->saved_raid_disk
= -1;
2731 rdev
->raid_disk
= -1;
2733 rdev
->data_offset
= 0;
2734 rdev
->sb_events
= 0;
2735 rdev
->last_read_error
.tv_sec
= 0;
2736 rdev
->last_read_error
.tv_nsec
= 0;
2737 atomic_set(&rdev
->nr_pending
, 0);
2738 atomic_set(&rdev
->read_errors
, 0);
2739 atomic_set(&rdev
->corrected_errors
, 0);
2741 size
= rdev
->bdev
->bd_inode
->i_size
>> BLOCK_SIZE_BITS
;
2744 "md: %s has zero or unknown size, marking faulty!\n",
2745 bdevname(rdev
->bdev
,b
));
2750 if (super_format
>= 0) {
2751 err
= super_types
[super_format
].
2752 load_super(rdev
, NULL
, super_minor
);
2753 if (err
== -EINVAL
) {
2755 "md: %s does not have a valid v%d.%d "
2756 "superblock, not importing!\n",
2757 bdevname(rdev
->bdev
,b
),
2758 super_format
, super_minor
);
2763 "md: could not read %s's sb, not importing!\n",
2764 bdevname(rdev
->bdev
,b
));
2769 INIT_LIST_HEAD(&rdev
->same_set
);
2770 init_waitqueue_head(&rdev
->blocked_wait
);
2775 if (rdev
->sb_page
) {
2781 return ERR_PTR(err
);
2785 * Check a full RAID array for plausibility
2789 static void analyze_sbs(mddev_t
* mddev
)
2792 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2793 char b
[BDEVNAME_SIZE
];
2796 rdev_for_each(rdev
, tmp
, mddev
)
2797 switch (super_types
[mddev
->major_version
].
2798 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2806 "md: fatal superblock inconsistency in %s"
2807 " -- removing from array\n",
2808 bdevname(rdev
->bdev
,b
));
2809 kick_rdev_from_array(rdev
);
2813 super_types
[mddev
->major_version
].
2814 validate_super(mddev
, freshest
);
2817 rdev_for_each(rdev
, tmp
, mddev
) {
2818 if (mddev
->max_disks
&&
2819 (rdev
->desc_nr
>= mddev
->max_disks
||
2820 i
> mddev
->max_disks
)) {
2822 "md: %s: %s: only %d devices permitted\n",
2823 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2825 kick_rdev_from_array(rdev
);
2828 if (rdev
!= freshest
)
2829 if (super_types
[mddev
->major_version
].
2830 validate_super(mddev
, rdev
)) {
2831 printk(KERN_WARNING
"md: kicking non-fresh %s"
2833 bdevname(rdev
->bdev
,b
));
2834 kick_rdev_from_array(rdev
);
2837 if (mddev
->level
== LEVEL_MULTIPATH
) {
2838 rdev
->desc_nr
= i
++;
2839 rdev
->raid_disk
= rdev
->desc_nr
;
2840 set_bit(In_sync
, &rdev
->flags
);
2841 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2842 rdev
->raid_disk
= -1;
2843 clear_bit(In_sync
, &rdev
->flags
);
2848 /* Read a fixed-point number.
2849 * Numbers in sysfs attributes should be in "standard" units where
2850 * possible, so time should be in seconds.
2851 * However we internally use a a much smaller unit such as
2852 * milliseconds or jiffies.
2853 * This function takes a decimal number with a possible fractional
2854 * component, and produces an integer which is the result of
2855 * multiplying that number by 10^'scale'.
2856 * all without any floating-point arithmetic.
2858 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2860 unsigned long result
= 0;
2862 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2865 else if (decimals
< scale
) {
2868 result
= result
* 10 + value
;
2880 while (decimals
< scale
) {
2889 static void md_safemode_timeout(unsigned long data
);
2892 safe_delay_show(mddev_t
*mddev
, char *page
)
2894 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
2895 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
2898 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
2902 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
2905 mddev
->safemode_delay
= 0;
2907 unsigned long old_delay
= mddev
->safemode_delay
;
2908 mddev
->safemode_delay
= (msec
*HZ
)/1000;
2909 if (mddev
->safemode_delay
== 0)
2910 mddev
->safemode_delay
= 1;
2911 if (mddev
->safemode_delay
< old_delay
)
2912 md_safemode_timeout((unsigned long)mddev
);
2916 static struct md_sysfs_entry md_safe_delay
=
2917 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
2920 level_show(mddev_t
*mddev
, char *page
)
2922 struct mdk_personality
*p
= mddev
->pers
;
2924 return sprintf(page
, "%s\n", p
->name
);
2925 else if (mddev
->clevel
[0])
2926 return sprintf(page
, "%s\n", mddev
->clevel
);
2927 else if (mddev
->level
!= LEVEL_NONE
)
2928 return sprintf(page
, "%d\n", mddev
->level
);
2934 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
2938 struct mdk_personality
*pers
;
2943 if (mddev
->pers
== NULL
) {
2946 if (len
>= sizeof(mddev
->clevel
))
2948 strncpy(mddev
->clevel
, buf
, len
);
2949 if (mddev
->clevel
[len
-1] == '\n')
2951 mddev
->clevel
[len
] = 0;
2952 mddev
->level
= LEVEL_NONE
;
2956 /* request to change the personality. Need to ensure:
2957 * - array is not engaged in resync/recovery/reshape
2958 * - old personality can be suspended
2959 * - new personality will access other array.
2962 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
2965 if (!mddev
->pers
->quiesce
) {
2966 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
2967 mdname(mddev
), mddev
->pers
->name
);
2971 /* Now find the new personality */
2972 if (len
== 0 || len
>= sizeof(clevel
))
2974 strncpy(clevel
, buf
, len
);
2975 if (clevel
[len
-1] == '\n')
2978 if (strict_strtol(clevel
, 10, &level
))
2981 if (request_module("md-%s", clevel
) != 0)
2982 request_module("md-level-%s", clevel
);
2983 spin_lock(&pers_lock
);
2984 pers
= find_pers(level
, clevel
);
2985 if (!pers
|| !try_module_get(pers
->owner
)) {
2986 spin_unlock(&pers_lock
);
2987 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
2990 spin_unlock(&pers_lock
);
2992 if (pers
== mddev
->pers
) {
2993 /* Nothing to do! */
2994 module_put(pers
->owner
);
2997 if (!pers
->takeover
) {
2998 module_put(pers
->owner
);
2999 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3000 mdname(mddev
), clevel
);
3004 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3005 rdev
->new_raid_disk
= rdev
->raid_disk
;
3007 /* ->takeover must set new_* and/or delta_disks
3008 * if it succeeds, and may set them when it fails.
3010 priv
= pers
->takeover(mddev
);
3012 mddev
->new_level
= mddev
->level
;
3013 mddev
->new_layout
= mddev
->layout
;
3014 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3015 mddev
->raid_disks
-= mddev
->delta_disks
;
3016 mddev
->delta_disks
= 0;
3017 module_put(pers
->owner
);
3018 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3019 mdname(mddev
), clevel
);
3020 return PTR_ERR(priv
);
3023 /* Looks like we have a winner */
3024 mddev_suspend(mddev
);
3025 mddev
->pers
->stop(mddev
);
3027 if (mddev
->pers
->sync_request
== NULL
&&
3028 pers
->sync_request
!= NULL
) {
3029 /* need to add the md_redundancy_group */
3030 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3032 "md: cannot register extra attributes for %s\n",
3034 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3036 if (mddev
->pers
->sync_request
!= NULL
&&
3037 pers
->sync_request
== NULL
) {
3038 /* need to remove the md_redundancy_group */
3039 if (mddev
->to_remove
== NULL
)
3040 mddev
->to_remove
= &md_redundancy_group
;
3043 if (mddev
->pers
->sync_request
== NULL
&&
3045 /* We are converting from a no-redundancy array
3046 * to a redundancy array and metadata is managed
3047 * externally so we need to be sure that writes
3048 * won't block due to a need to transition
3050 * until external management is started.
3053 mddev
->safemode_delay
= 0;
3054 mddev
->safemode
= 0;
3057 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3059 if (rdev
->raid_disk
< 0)
3061 if (rdev
->new_raid_disk
> mddev
->raid_disks
)
3062 rdev
->new_raid_disk
= -1;
3063 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3065 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3066 sysfs_remove_link(&mddev
->kobj
, nm
);
3068 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3069 if (rdev
->raid_disk
< 0)
3071 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3073 rdev
->raid_disk
= rdev
->new_raid_disk
;
3074 if (rdev
->raid_disk
< 0)
3075 clear_bit(In_sync
, &rdev
->flags
);
3078 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3079 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3080 printk("md: cannot register %s for %s after level change\n",
3085 module_put(mddev
->pers
->owner
);
3087 mddev
->private = priv
;
3088 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3089 mddev
->level
= mddev
->new_level
;
3090 mddev
->layout
= mddev
->new_layout
;
3091 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3092 mddev
->delta_disks
= 0;
3093 if (mddev
->pers
->sync_request
== NULL
) {
3094 /* this is now an array without redundancy, so
3095 * it must always be in_sync
3098 del_timer_sync(&mddev
->safemode_timer
);
3101 mddev_resume(mddev
);
3102 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3103 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3104 md_wakeup_thread(mddev
->thread
);
3105 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3106 md_new_event(mddev
);
3110 static struct md_sysfs_entry md_level
=
3111 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3115 layout_show(mddev_t
*mddev
, char *page
)
3117 /* just a number, not meaningful for all levels */
3118 if (mddev
->reshape_position
!= MaxSector
&&
3119 mddev
->layout
!= mddev
->new_layout
)
3120 return sprintf(page
, "%d (%d)\n",
3121 mddev
->new_layout
, mddev
->layout
);
3122 return sprintf(page
, "%d\n", mddev
->layout
);
3126 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3129 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3131 if (!*buf
|| (*e
&& *e
!= '\n'))
3136 if (mddev
->pers
->check_reshape
== NULL
)
3138 mddev
->new_layout
= n
;
3139 err
= mddev
->pers
->check_reshape(mddev
);
3141 mddev
->new_layout
= mddev
->layout
;
3145 mddev
->new_layout
= n
;
3146 if (mddev
->reshape_position
== MaxSector
)
3151 static struct md_sysfs_entry md_layout
=
3152 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3156 raid_disks_show(mddev_t
*mddev
, char *page
)
3158 if (mddev
->raid_disks
== 0)
3160 if (mddev
->reshape_position
!= MaxSector
&&
3161 mddev
->delta_disks
!= 0)
3162 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3163 mddev
->raid_disks
- mddev
->delta_disks
);
3164 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3167 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3170 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3174 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3176 if (!*buf
|| (*e
&& *e
!= '\n'))
3180 rv
= update_raid_disks(mddev
, n
);
3181 else if (mddev
->reshape_position
!= MaxSector
) {
3182 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3183 mddev
->delta_disks
= n
- olddisks
;
3184 mddev
->raid_disks
= n
;
3186 mddev
->raid_disks
= n
;
3187 return rv
? rv
: len
;
3189 static struct md_sysfs_entry md_raid_disks
=
3190 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3193 chunk_size_show(mddev_t
*mddev
, char *page
)
3195 if (mddev
->reshape_position
!= MaxSector
&&
3196 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3197 return sprintf(page
, "%d (%d)\n",
3198 mddev
->new_chunk_sectors
<< 9,
3199 mddev
->chunk_sectors
<< 9);
3200 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3204 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3207 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3209 if (!*buf
|| (*e
&& *e
!= '\n'))
3214 if (mddev
->pers
->check_reshape
== NULL
)
3216 mddev
->new_chunk_sectors
= n
>> 9;
3217 err
= mddev
->pers
->check_reshape(mddev
);
3219 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3223 mddev
->new_chunk_sectors
= n
>> 9;
3224 if (mddev
->reshape_position
== MaxSector
)
3225 mddev
->chunk_sectors
= n
>> 9;
3229 static struct md_sysfs_entry md_chunk_size
=
3230 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3233 resync_start_show(mddev_t
*mddev
, char *page
)
3235 if (mddev
->recovery_cp
== MaxSector
)
3236 return sprintf(page
, "none\n");
3237 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3241 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3244 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3248 if (cmd_match(buf
, "none"))
3250 else if (!*buf
|| (*e
&& *e
!= '\n'))
3253 mddev
->recovery_cp
= n
;
3256 static struct md_sysfs_entry md_resync_start
=
3257 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3260 * The array state can be:
3263 * No devices, no size, no level
3264 * Equivalent to STOP_ARRAY ioctl
3266 * May have some settings, but array is not active
3267 * all IO results in error
3268 * When written, doesn't tear down array, but just stops it
3269 * suspended (not supported yet)
3270 * All IO requests will block. The array can be reconfigured.
3271 * Writing this, if accepted, will block until array is quiescent
3273 * no resync can happen. no superblocks get written.
3274 * write requests fail
3276 * like readonly, but behaves like 'clean' on a write request.
3278 * clean - no pending writes, but otherwise active.
3279 * When written to inactive array, starts without resync
3280 * If a write request arrives then
3281 * if metadata is known, mark 'dirty' and switch to 'active'.
3282 * if not known, block and switch to write-pending
3283 * If written to an active array that has pending writes, then fails.
3285 * fully active: IO and resync can be happening.
3286 * When written to inactive array, starts with resync
3289 * clean, but writes are blocked waiting for 'active' to be written.
3292 * like active, but no writes have been seen for a while (100msec).
3295 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3296 write_pending
, active_idle
, bad_word
};
3297 static char *array_states
[] = {
3298 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3299 "write-pending", "active-idle", NULL
};
3301 static int match_word(const char *word
, char **list
)
3304 for (n
=0; list
[n
]; n
++)
3305 if (cmd_match(word
, list
[n
]))
3311 array_state_show(mddev_t
*mddev
, char *page
)
3313 enum array_state st
= inactive
;
3326 else if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
3328 else if (mddev
->safemode
)
3334 if (list_empty(&mddev
->disks
) &&
3335 mddev
->raid_disks
== 0 &&
3336 mddev
->dev_sectors
== 0)
3341 return sprintf(page
, "%s\n", array_states
[st
]);
3344 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3345 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3346 static int do_md_run(mddev_t
* mddev
);
3347 static int restart_array(mddev_t
*mddev
);
3350 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3353 enum array_state st
= match_word(buf
, array_states
);
3358 /* stopping an active array */
3359 if (atomic_read(&mddev
->openers
) > 0)
3361 err
= do_md_stop(mddev
, 0, 0);
3364 /* stopping an active array */
3366 if (atomic_read(&mddev
->openers
) > 0)
3368 err
= do_md_stop(mddev
, 2, 0);
3370 err
= 0; /* already inactive */
3373 break; /* not supported yet */
3376 err
= md_set_readonly(mddev
, 0);
3379 set_disk_ro(mddev
->gendisk
, 1);
3380 err
= do_md_run(mddev
);
3386 err
= md_set_readonly(mddev
, 0);
3387 else if (mddev
->ro
== 1)
3388 err
= restart_array(mddev
);
3391 set_disk_ro(mddev
->gendisk
, 0);
3395 err
= do_md_run(mddev
);
3400 restart_array(mddev
);
3401 spin_lock_irq(&mddev
->write_lock
);
3402 if (atomic_read(&mddev
->writes_pending
) == 0) {
3403 if (mddev
->in_sync
== 0) {
3405 if (mddev
->safemode
== 1)
3406 mddev
->safemode
= 0;
3407 if (mddev
->persistent
)
3408 set_bit(MD_CHANGE_CLEAN
,
3414 spin_unlock_irq(&mddev
->write_lock
);
3420 restart_array(mddev
);
3421 if (mddev
->external
)
3422 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3423 wake_up(&mddev
->sb_wait
);
3427 set_disk_ro(mddev
->gendisk
, 0);
3428 err
= do_md_run(mddev
);
3433 /* these cannot be set */
3439 sysfs_notify_dirent(mddev
->sysfs_state
);
3443 static struct md_sysfs_entry md_array_state
=
3444 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3447 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3448 return sprintf(page
, "%d\n",
3449 atomic_read(&mddev
->max_corr_read_errors
));
3453 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3456 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3458 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3459 atomic_set(&mddev
->max_corr_read_errors
, n
);
3465 static struct md_sysfs_entry max_corr_read_errors
=
3466 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3467 max_corrected_read_errors_store
);
3470 null_show(mddev_t
*mddev
, char *page
)
3476 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3478 /* buf must be %d:%d\n? giving major and minor numbers */
3479 /* The new device is added to the array.
3480 * If the array has a persistent superblock, we read the
3481 * superblock to initialise info and check validity.
3482 * Otherwise, only checking done is that in bind_rdev_to_array,
3483 * which mainly checks size.
3486 int major
= simple_strtoul(buf
, &e
, 10);
3492 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3494 minor
= simple_strtoul(e
+1, &e
, 10);
3495 if (*e
&& *e
!= '\n')
3497 dev
= MKDEV(major
, minor
);
3498 if (major
!= MAJOR(dev
) ||
3499 minor
!= MINOR(dev
))
3503 if (mddev
->persistent
) {
3504 rdev
= md_import_device(dev
, mddev
->major_version
,
3505 mddev
->minor_version
);
3506 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3507 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3508 mdk_rdev_t
, same_set
);
3509 err
= super_types
[mddev
->major_version
]
3510 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3514 } else if (mddev
->external
)
3515 rdev
= md_import_device(dev
, -2, -1);
3517 rdev
= md_import_device(dev
, -1, -1);
3520 return PTR_ERR(rdev
);
3521 err
= bind_rdev_to_array(rdev
, mddev
);
3525 return err
? err
: len
;
3528 static struct md_sysfs_entry md_new_device
=
3529 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3532 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3535 unsigned long chunk
, end_chunk
;
3539 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3541 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3542 if (buf
== end
) break;
3543 if (*end
== '-') { /* range */
3545 end_chunk
= simple_strtoul(buf
, &end
, 0);
3546 if (buf
== end
) break;
3548 if (*end
&& !isspace(*end
)) break;
3549 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3550 buf
= skip_spaces(end
);
3552 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3557 static struct md_sysfs_entry md_bitmap
=
3558 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3561 size_show(mddev_t
*mddev
, char *page
)
3563 return sprintf(page
, "%llu\n",
3564 (unsigned long long)mddev
->dev_sectors
/ 2);
3567 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3570 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3572 /* If array is inactive, we can reduce the component size, but
3573 * not increase it (except from 0).
3574 * If array is active, we can try an on-line resize
3577 int err
= strict_blocks_to_sectors(buf
, §ors
);
3582 err
= update_size(mddev
, sectors
);
3583 md_update_sb(mddev
, 1);
3585 if (mddev
->dev_sectors
== 0 ||
3586 mddev
->dev_sectors
> sectors
)
3587 mddev
->dev_sectors
= sectors
;
3591 return err
? err
: len
;
3594 static struct md_sysfs_entry md_size
=
3595 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3600 * 'none' for arrays with no metadata (good luck...)
3601 * 'external' for arrays with externally managed metadata,
3602 * or N.M for internally known formats
3605 metadata_show(mddev_t
*mddev
, char *page
)
3607 if (mddev
->persistent
)
3608 return sprintf(page
, "%d.%d\n",
3609 mddev
->major_version
, mddev
->minor_version
);
3610 else if (mddev
->external
)
3611 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3613 return sprintf(page
, "none\n");
3617 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3621 /* Changing the details of 'external' metadata is
3622 * always permitted. Otherwise there must be
3623 * no devices attached to the array.
3625 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3627 else if (!list_empty(&mddev
->disks
))
3630 if (cmd_match(buf
, "none")) {
3631 mddev
->persistent
= 0;
3632 mddev
->external
= 0;
3633 mddev
->major_version
= 0;
3634 mddev
->minor_version
= 90;
3637 if (strncmp(buf
, "external:", 9) == 0) {
3638 size_t namelen
= len
-9;
3639 if (namelen
>= sizeof(mddev
->metadata_type
))
3640 namelen
= sizeof(mddev
->metadata_type
)-1;
3641 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3642 mddev
->metadata_type
[namelen
] = 0;
3643 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3644 mddev
->metadata_type
[--namelen
] = 0;
3645 mddev
->persistent
= 0;
3646 mddev
->external
= 1;
3647 mddev
->major_version
= 0;
3648 mddev
->minor_version
= 90;
3651 major
= simple_strtoul(buf
, &e
, 10);
3652 if (e
==buf
|| *e
!= '.')
3655 minor
= simple_strtoul(buf
, &e
, 10);
3656 if (e
==buf
|| (*e
&& *e
!= '\n') )
3658 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3660 mddev
->major_version
= major
;
3661 mddev
->minor_version
= minor
;
3662 mddev
->persistent
= 1;
3663 mddev
->external
= 0;
3667 static struct md_sysfs_entry md_metadata
=
3668 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3671 action_show(mddev_t
*mddev
, char *page
)
3673 char *type
= "idle";
3674 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3676 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3677 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3678 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3680 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3681 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3683 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3687 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3690 return sprintf(page
, "%s\n", type
);
3694 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3696 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3699 if (cmd_match(page
, "frozen"))
3700 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3702 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3704 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3705 if (mddev
->sync_thread
) {
3706 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3707 md_unregister_thread(mddev
->sync_thread
);
3708 mddev
->sync_thread
= NULL
;
3709 mddev
->recovery
= 0;
3711 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3712 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3714 else if (cmd_match(page
, "resync"))
3715 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3716 else if (cmd_match(page
, "recover")) {
3717 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3718 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3719 } else if (cmd_match(page
, "reshape")) {
3721 if (mddev
->pers
->start_reshape
== NULL
)
3723 err
= mddev
->pers
->start_reshape(mddev
);
3726 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3728 if (cmd_match(page
, "check"))
3729 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3730 else if (!cmd_match(page
, "repair"))
3732 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3733 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3735 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3736 md_wakeup_thread(mddev
->thread
);
3737 sysfs_notify_dirent(mddev
->sysfs_action
);
3742 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3744 return sprintf(page
, "%llu\n",
3745 (unsigned long long) mddev
->resync_mismatches
);
3748 static struct md_sysfs_entry md_scan_mode
=
3749 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3752 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3755 sync_min_show(mddev_t
*mddev
, char *page
)
3757 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3758 mddev
->sync_speed_min
? "local": "system");
3762 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3766 if (strncmp(buf
, "system", 6)==0) {
3767 mddev
->sync_speed_min
= 0;
3770 min
= simple_strtoul(buf
, &e
, 10);
3771 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3773 mddev
->sync_speed_min
= min
;
3777 static struct md_sysfs_entry md_sync_min
=
3778 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3781 sync_max_show(mddev_t
*mddev
, char *page
)
3783 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3784 mddev
->sync_speed_max
? "local": "system");
3788 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3792 if (strncmp(buf
, "system", 6)==0) {
3793 mddev
->sync_speed_max
= 0;
3796 max
= simple_strtoul(buf
, &e
, 10);
3797 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3799 mddev
->sync_speed_max
= max
;
3803 static struct md_sysfs_entry md_sync_max
=
3804 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3807 degraded_show(mddev_t
*mddev
, char *page
)
3809 return sprintf(page
, "%d\n", mddev
->degraded
);
3811 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3814 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3816 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3820 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3824 if (strict_strtol(buf
, 10, &n
))
3827 if (n
!= 0 && n
!= 1)
3830 mddev
->parallel_resync
= n
;
3832 if (mddev
->sync_thread
)
3833 wake_up(&resync_wait
);
3838 /* force parallel resync, even with shared block devices */
3839 static struct md_sysfs_entry md_sync_force_parallel
=
3840 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3841 sync_force_parallel_show
, sync_force_parallel_store
);
3844 sync_speed_show(mddev_t
*mddev
, char *page
)
3846 unsigned long resync
, dt
, db
;
3847 if (mddev
->curr_resync
== 0)
3848 return sprintf(page
, "none\n");
3849 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3850 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3852 db
= resync
- mddev
->resync_mark_cnt
;
3853 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3856 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3859 sync_completed_show(mddev_t
*mddev
, char *page
)
3861 unsigned long max_sectors
, resync
;
3863 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3864 return sprintf(page
, "none\n");
3866 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3867 max_sectors
= mddev
->resync_max_sectors
;
3869 max_sectors
= mddev
->dev_sectors
;
3871 resync
= mddev
->curr_resync_completed
;
3872 return sprintf(page
, "%lu / %lu\n", resync
, max_sectors
);
3875 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3878 min_sync_show(mddev_t
*mddev
, char *page
)
3880 return sprintf(page
, "%llu\n",
3881 (unsigned long long)mddev
->resync_min
);
3884 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3886 unsigned long long min
;
3887 if (strict_strtoull(buf
, 10, &min
))
3889 if (min
> mddev
->resync_max
)
3891 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3894 /* Must be a multiple of chunk_size */
3895 if (mddev
->chunk_sectors
) {
3896 sector_t temp
= min
;
3897 if (sector_div(temp
, mddev
->chunk_sectors
))
3900 mddev
->resync_min
= min
;
3905 static struct md_sysfs_entry md_min_sync
=
3906 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
3909 max_sync_show(mddev_t
*mddev
, char *page
)
3911 if (mddev
->resync_max
== MaxSector
)
3912 return sprintf(page
, "max\n");
3914 return sprintf(page
, "%llu\n",
3915 (unsigned long long)mddev
->resync_max
);
3918 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3920 if (strncmp(buf
, "max", 3) == 0)
3921 mddev
->resync_max
= MaxSector
;
3923 unsigned long long max
;
3924 if (strict_strtoull(buf
, 10, &max
))
3926 if (max
< mddev
->resync_min
)
3928 if (max
< mddev
->resync_max
&&
3930 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3933 /* Must be a multiple of chunk_size */
3934 if (mddev
->chunk_sectors
) {
3935 sector_t temp
= max
;
3936 if (sector_div(temp
, mddev
->chunk_sectors
))
3939 mddev
->resync_max
= max
;
3941 wake_up(&mddev
->recovery_wait
);
3945 static struct md_sysfs_entry md_max_sync
=
3946 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
3949 suspend_lo_show(mddev_t
*mddev
, char *page
)
3951 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
3955 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3958 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3960 if (mddev
->pers
== NULL
||
3961 mddev
->pers
->quiesce
== NULL
)
3963 if (buf
== e
|| (*e
&& *e
!= '\n'))
3965 if (new >= mddev
->suspend_hi
||
3966 (new > mddev
->suspend_lo
&& new < mddev
->suspend_hi
)) {
3967 mddev
->suspend_lo
= new;
3968 mddev
->pers
->quiesce(mddev
, 2);
3973 static struct md_sysfs_entry md_suspend_lo
=
3974 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
3978 suspend_hi_show(mddev_t
*mddev
, char *page
)
3980 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
3984 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3987 unsigned long long new = simple_strtoull(buf
, &e
, 10);
3989 if (mddev
->pers
== NULL
||
3990 mddev
->pers
->quiesce
== NULL
)
3992 if (buf
== e
|| (*e
&& *e
!= '\n'))
3994 if ((new <= mddev
->suspend_lo
&& mddev
->suspend_lo
>= mddev
->suspend_hi
) ||
3995 (new > mddev
->suspend_lo
&& new > mddev
->suspend_hi
)) {
3996 mddev
->suspend_hi
= new;
3997 mddev
->pers
->quiesce(mddev
, 1);
3998 mddev
->pers
->quiesce(mddev
, 0);
4003 static struct md_sysfs_entry md_suspend_hi
=
4004 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4007 reshape_position_show(mddev_t
*mddev
, char *page
)
4009 if (mddev
->reshape_position
!= MaxSector
)
4010 return sprintf(page
, "%llu\n",
4011 (unsigned long long)mddev
->reshape_position
);
4012 strcpy(page
, "none\n");
4017 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4020 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4023 if (buf
== e
|| (*e
&& *e
!= '\n'))
4025 mddev
->reshape_position
= new;
4026 mddev
->delta_disks
= 0;
4027 mddev
->new_level
= mddev
->level
;
4028 mddev
->new_layout
= mddev
->layout
;
4029 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4033 static struct md_sysfs_entry md_reshape_position
=
4034 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4035 reshape_position_store
);
4038 array_size_show(mddev_t
*mddev
, char *page
)
4040 if (mddev
->external_size
)
4041 return sprintf(page
, "%llu\n",
4042 (unsigned long long)mddev
->array_sectors
/2);
4044 return sprintf(page
, "default\n");
4048 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4052 if (strncmp(buf
, "default", 7) == 0) {
4054 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4056 sectors
= mddev
->array_sectors
;
4058 mddev
->external_size
= 0;
4060 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4062 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4065 mddev
->external_size
= 1;
4068 mddev
->array_sectors
= sectors
;
4069 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4071 revalidate_disk(mddev
->gendisk
);
4076 static struct md_sysfs_entry md_array_size
=
4077 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4080 static struct attribute
*md_default_attrs
[] = {
4083 &md_raid_disks
.attr
,
4084 &md_chunk_size
.attr
,
4086 &md_resync_start
.attr
,
4088 &md_new_device
.attr
,
4089 &md_safe_delay
.attr
,
4090 &md_array_state
.attr
,
4091 &md_reshape_position
.attr
,
4092 &md_array_size
.attr
,
4093 &max_corr_read_errors
.attr
,
4097 static struct attribute
*md_redundancy_attrs
[] = {
4099 &md_mismatches
.attr
,
4102 &md_sync_speed
.attr
,
4103 &md_sync_force_parallel
.attr
,
4104 &md_sync_completed
.attr
,
4107 &md_suspend_lo
.attr
,
4108 &md_suspend_hi
.attr
,
4113 static struct attribute_group md_redundancy_group
= {
4115 .attrs
= md_redundancy_attrs
,
4120 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4122 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4123 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4128 rv
= mddev_lock(mddev
);
4130 rv
= entry
->show(mddev
, page
);
4131 mddev_unlock(mddev
);
4137 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4138 const char *page
, size_t length
)
4140 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4141 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4146 if (!capable(CAP_SYS_ADMIN
))
4148 rv
= mddev_lock(mddev
);
4149 if (mddev
->hold_active
== UNTIL_IOCTL
)
4150 mddev
->hold_active
= 0;
4152 rv
= entry
->store(mddev
, page
, length
);
4153 mddev_unlock(mddev
);
4158 static void md_free(struct kobject
*ko
)
4160 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4162 if (mddev
->sysfs_state
)
4163 sysfs_put(mddev
->sysfs_state
);
4165 if (mddev
->gendisk
) {
4166 del_gendisk(mddev
->gendisk
);
4167 put_disk(mddev
->gendisk
);
4170 blk_cleanup_queue(mddev
->queue
);
4175 static const struct sysfs_ops md_sysfs_ops
= {
4176 .show
= md_attr_show
,
4177 .store
= md_attr_store
,
4179 static struct kobj_type md_ktype
= {
4181 .sysfs_ops
= &md_sysfs_ops
,
4182 .default_attrs
= md_default_attrs
,
4187 static void mddev_delayed_delete(struct work_struct
*ws
)
4189 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4191 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4192 kobject_del(&mddev
->kobj
);
4193 kobject_put(&mddev
->kobj
);
4196 static int md_alloc(dev_t dev
, char *name
)
4198 static DEFINE_MUTEX(disks_mutex
);
4199 mddev_t
*mddev
= mddev_find(dev
);
4200 struct gendisk
*disk
;
4209 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4210 shift
= partitioned
? MdpMinorShift
: 0;
4211 unit
= MINOR(mddev
->unit
) >> shift
;
4213 /* wait for any previous instance if this device
4214 * to be completed removed (mddev_delayed_delete).
4216 flush_scheduled_work();
4218 mutex_lock(&disks_mutex
);
4224 /* Need to ensure that 'name' is not a duplicate.
4227 spin_lock(&all_mddevs_lock
);
4229 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4230 if (mddev2
->gendisk
&&
4231 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4232 spin_unlock(&all_mddevs_lock
);
4235 spin_unlock(&all_mddevs_lock
);
4239 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4242 mddev
->queue
->queuedata
= mddev
;
4244 /* Can be unlocked because the queue is new: no concurrency */
4245 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER
, mddev
->queue
);
4247 blk_queue_make_request(mddev
->queue
, md_make_request
);
4249 disk
= alloc_disk(1 << shift
);
4251 blk_cleanup_queue(mddev
->queue
);
4252 mddev
->queue
= NULL
;
4255 disk
->major
= MAJOR(mddev
->unit
);
4256 disk
->first_minor
= unit
<< shift
;
4258 strcpy(disk
->disk_name
, name
);
4259 else if (partitioned
)
4260 sprintf(disk
->disk_name
, "md_d%d", unit
);
4262 sprintf(disk
->disk_name
, "md%d", unit
);
4263 disk
->fops
= &md_fops
;
4264 disk
->private_data
= mddev
;
4265 disk
->queue
= mddev
->queue
;
4266 /* Allow extended partitions. This makes the
4267 * 'mdp' device redundant, but we can't really
4270 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4272 mddev
->gendisk
= disk
;
4273 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4274 &disk_to_dev(disk
)->kobj
, "%s", "md");
4276 /* This isn't possible, but as kobject_init_and_add is marked
4277 * __must_check, we must do something with the result
4279 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4283 if (sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4284 printk(KERN_DEBUG
"pointless warning\n");
4286 mutex_unlock(&disks_mutex
);
4288 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4289 mddev
->sysfs_state
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "array_state");
4295 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4297 md_alloc(dev
, NULL
);
4301 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4303 /* val must be "md_*" where * is not all digits.
4304 * We allocate an array with a large free minor number, and
4305 * set the name to val. val must not already be an active name.
4307 int len
= strlen(val
);
4308 char buf
[DISK_NAME_LEN
];
4310 while (len
&& val
[len
-1] == '\n')
4312 if (len
>= DISK_NAME_LEN
)
4314 strlcpy(buf
, val
, len
+1);
4315 if (strncmp(buf
, "md_", 3) != 0)
4317 return md_alloc(0, buf
);
4320 static void md_safemode_timeout(unsigned long data
)
4322 mddev_t
*mddev
= (mddev_t
*) data
;
4324 if (!atomic_read(&mddev
->writes_pending
)) {
4325 mddev
->safemode
= 1;
4326 if (mddev
->external
)
4327 sysfs_notify_dirent(mddev
->sysfs_state
);
4329 md_wakeup_thread(mddev
->thread
);
4332 static int start_dirty_degraded
;
4334 static int md_run(mddev_t
*mddev
)
4338 struct mdk_personality
*pers
;
4340 if (list_empty(&mddev
->disks
))
4341 /* cannot run an array with no devices.. */
4347 /* These two calls synchronise us with the
4348 * sysfs_remove_group calls in mddev_unlock,
4349 * so they must have completed.
4351 mutex_lock(&mddev
->open_mutex
);
4352 mutex_unlock(&mddev
->open_mutex
);
4355 * Analyze all RAID superblock(s)
4357 if (!mddev
->raid_disks
) {
4358 if (!mddev
->persistent
)
4363 if (mddev
->level
!= LEVEL_NONE
)
4364 request_module("md-level-%d", mddev
->level
);
4365 else if (mddev
->clevel
[0])
4366 request_module("md-%s", mddev
->clevel
);
4369 * Drop all container device buffers, from now on
4370 * the only valid external interface is through the md
4373 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4374 if (test_bit(Faulty
, &rdev
->flags
))
4376 sync_blockdev(rdev
->bdev
);
4377 invalidate_bdev(rdev
->bdev
);
4379 /* perform some consistency tests on the device.
4380 * We don't want the data to overlap the metadata,
4381 * Internal Bitmap issues have been handled elsewhere.
4383 if (rdev
->data_offset
< rdev
->sb_start
) {
4384 if (mddev
->dev_sectors
&&
4385 rdev
->data_offset
+ mddev
->dev_sectors
4387 printk("md: %s: data overlaps metadata\n",
4392 if (rdev
->sb_start
+ rdev
->sb_size
/512
4393 > rdev
->data_offset
) {
4394 printk("md: %s: metadata overlaps data\n",
4399 sysfs_notify_dirent(rdev
->sysfs_state
);
4402 spin_lock(&pers_lock
);
4403 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4404 if (!pers
|| !try_module_get(pers
->owner
)) {
4405 spin_unlock(&pers_lock
);
4406 if (mddev
->level
!= LEVEL_NONE
)
4407 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4410 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4415 spin_unlock(&pers_lock
);
4416 if (mddev
->level
!= pers
->level
) {
4417 mddev
->level
= pers
->level
;
4418 mddev
->new_level
= pers
->level
;
4420 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4422 if (mddev
->reshape_position
!= MaxSector
&&
4423 pers
->start_reshape
== NULL
) {
4424 /* This personality cannot handle reshaping... */
4426 module_put(pers
->owner
);
4430 if (pers
->sync_request
) {
4431 /* Warn if this is a potentially silly
4434 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4438 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4439 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4441 rdev
->bdev
->bd_contains
==
4442 rdev2
->bdev
->bd_contains
) {
4444 "%s: WARNING: %s appears to be"
4445 " on the same physical disk as"
4448 bdevname(rdev
->bdev
,b
),
4449 bdevname(rdev2
->bdev
,b2
));
4456 "True protection against single-disk"
4457 " failure might be compromised.\n");
4460 mddev
->recovery
= 0;
4461 /* may be over-ridden by personality */
4462 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4464 mddev
->barriers_work
= 1;
4465 mddev
->ok_start_degraded
= start_dirty_degraded
;
4467 if (start_readonly
&& mddev
->ro
== 0)
4468 mddev
->ro
= 2; /* read-only, but switch on first write */
4470 err
= mddev
->pers
->run(mddev
);
4472 printk(KERN_ERR
"md: pers->run() failed ...\n");
4473 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4474 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4475 " but 'external_size' not in effect?\n", __func__
);
4477 "md: invalid array_size %llu > default size %llu\n",
4478 (unsigned long long)mddev
->array_sectors
/ 2,
4479 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4481 mddev
->pers
->stop(mddev
);
4483 if (err
== 0 && mddev
->pers
->sync_request
) {
4484 err
= bitmap_create(mddev
);
4486 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4487 mdname(mddev
), err
);
4488 mddev
->pers
->stop(mddev
);
4492 module_put(mddev
->pers
->owner
);
4494 bitmap_destroy(mddev
);
4497 if (mddev
->pers
->sync_request
) {
4498 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4500 "md: cannot register extra attributes for %s\n",
4502 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
4503 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4506 atomic_set(&mddev
->writes_pending
,0);
4507 atomic_set(&mddev
->max_corr_read_errors
,
4508 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4509 mddev
->safemode
= 0;
4510 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4511 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4512 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4515 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4516 if (rdev
->raid_disk
>= 0) {
4518 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4519 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4520 printk("md: cannot register %s for %s\n",
4524 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4527 md_update_sb(mddev
, 0);
4529 md_wakeup_thread(mddev
->thread
);
4530 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4532 md_new_event(mddev
);
4533 sysfs_notify_dirent(mddev
->sysfs_state
);
4534 if (mddev
->sysfs_action
)
4535 sysfs_notify_dirent(mddev
->sysfs_action
);
4536 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4540 static int do_md_run(mddev_t
*mddev
)
4544 err
= md_run(mddev
);
4548 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4549 revalidate_disk(mddev
->gendisk
);
4550 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4555 static int restart_array(mddev_t
*mddev
)
4557 struct gendisk
*disk
= mddev
->gendisk
;
4559 /* Complain if it has no devices */
4560 if (list_empty(&mddev
->disks
))
4566 mddev
->safemode
= 0;
4568 set_disk_ro(disk
, 0);
4569 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4571 /* Kick recovery or resync if necessary */
4572 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4573 md_wakeup_thread(mddev
->thread
);
4574 md_wakeup_thread(mddev
->sync_thread
);
4575 sysfs_notify_dirent(mddev
->sysfs_state
);
4579 /* similar to deny_write_access, but accounts for our holding a reference
4580 * to the file ourselves */
4581 static int deny_bitmap_write_access(struct file
* file
)
4583 struct inode
*inode
= file
->f_mapping
->host
;
4585 spin_lock(&inode
->i_lock
);
4586 if (atomic_read(&inode
->i_writecount
) > 1) {
4587 spin_unlock(&inode
->i_lock
);
4590 atomic_set(&inode
->i_writecount
, -1);
4591 spin_unlock(&inode
->i_lock
);
4596 void restore_bitmap_write_access(struct file
*file
)
4598 struct inode
*inode
= file
->f_mapping
->host
;
4600 spin_lock(&inode
->i_lock
);
4601 atomic_set(&inode
->i_writecount
, 1);
4602 spin_unlock(&inode
->i_lock
);
4605 static void md_clean(mddev_t
*mddev
)
4607 mddev
->array_sectors
= 0;
4608 mddev
->external_size
= 0;
4609 mddev
->dev_sectors
= 0;
4610 mddev
->raid_disks
= 0;
4611 mddev
->recovery_cp
= 0;
4612 mddev
->resync_min
= 0;
4613 mddev
->resync_max
= MaxSector
;
4614 mddev
->reshape_position
= MaxSector
;
4615 mddev
->external
= 0;
4616 mddev
->persistent
= 0;
4617 mddev
->level
= LEVEL_NONE
;
4618 mddev
->clevel
[0] = 0;
4621 mddev
->metadata_type
[0] = 0;
4622 mddev
->chunk_sectors
= 0;
4623 mddev
->ctime
= mddev
->utime
= 0;
4625 mddev
->max_disks
= 0;
4627 mddev
->can_decrease_events
= 0;
4628 mddev
->delta_disks
= 0;
4629 mddev
->new_level
= LEVEL_NONE
;
4630 mddev
->new_layout
= 0;
4631 mddev
->new_chunk_sectors
= 0;
4632 mddev
->curr_resync
= 0;
4633 mddev
->resync_mismatches
= 0;
4634 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4635 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4636 mddev
->recovery
= 0;
4638 mddev
->degraded
= 0;
4639 mddev
->barriers_work
= 0;
4640 mddev
->safemode
= 0;
4641 mddev
->bitmap_info
.offset
= 0;
4642 mddev
->bitmap_info
.default_offset
= 0;
4643 mddev
->bitmap_info
.chunksize
= 0;
4644 mddev
->bitmap_info
.daemon_sleep
= 0;
4645 mddev
->bitmap_info
.max_write_behind
= 0;
4648 static void md_stop_writes(mddev_t
*mddev
)
4650 if (mddev
->sync_thread
) {
4651 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4652 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4653 md_unregister_thread(mddev
->sync_thread
);
4654 mddev
->sync_thread
= NULL
;
4657 del_timer_sync(&mddev
->safemode_timer
);
4659 bitmap_flush(mddev
);
4660 md_super_wait(mddev
);
4662 if (!mddev
->in_sync
|| mddev
->flags
) {
4663 /* mark array as shutdown cleanly */
4665 md_update_sb(mddev
, 1);
4669 static void md_stop(mddev_t
*mddev
)
4671 md_stop_writes(mddev
);
4673 mddev
->pers
->stop(mddev
);
4674 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4675 mddev
->to_remove
= &md_redundancy_group
;
4676 module_put(mddev
->pers
->owner
);
4678 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4681 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4684 mutex_lock(&mddev
->open_mutex
);
4685 if (atomic_read(&mddev
->openers
) > is_open
) {
4686 printk("md: %s still in use.\n",mdname(mddev
));
4691 md_stop_writes(mddev
);
4697 set_disk_ro(mddev
->gendisk
, 1);
4698 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4699 sysfs_notify_dirent(mddev
->sysfs_state
);
4703 mutex_unlock(&mddev
->open_mutex
);
4708 * 0 - completely stop and dis-assemble array
4709 * 2 - stop but do not disassemble array
4711 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4714 struct gendisk
*disk
= mddev
->gendisk
;
4717 mutex_lock(&mddev
->open_mutex
);
4718 if (atomic_read(&mddev
->openers
) > is_open
) {
4719 printk("md: %s still in use.\n",mdname(mddev
));
4721 } else if (mddev
->pers
) {
4724 set_disk_ro(disk
, 0);
4727 mddev
->queue
->merge_bvec_fn
= NULL
;
4728 mddev
->queue
->unplug_fn
= NULL
;
4729 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4731 /* tell userspace to handle 'inactive' */
4732 sysfs_notify_dirent(mddev
->sysfs_state
);
4734 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4735 if (rdev
->raid_disk
>= 0) {
4737 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4738 sysfs_remove_link(&mddev
->kobj
, nm
);
4741 set_capacity(disk
, 0);
4742 revalidate_disk(disk
);
4749 mutex_unlock(&mddev
->open_mutex
);
4753 * Free resources if final stop
4757 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4759 bitmap_destroy(mddev
);
4760 if (mddev
->bitmap_info
.file
) {
4761 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4762 fput(mddev
->bitmap_info
.file
);
4763 mddev
->bitmap_info
.file
= NULL
;
4765 mddev
->bitmap_info
.offset
= 0;
4767 export_array(mddev
);
4770 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4771 if (mddev
->hold_active
== UNTIL_STOP
)
4772 mddev
->hold_active
= 0;
4776 blk_integrity_unregister(disk
);
4777 md_new_event(mddev
);
4778 sysfs_notify_dirent(mddev
->sysfs_state
);
4783 static void autorun_array(mddev_t
*mddev
)
4788 if (list_empty(&mddev
->disks
))
4791 printk(KERN_INFO
"md: running: ");
4793 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4794 char b
[BDEVNAME_SIZE
];
4795 printk("<%s>", bdevname(rdev
->bdev
,b
));
4799 err
= do_md_run(mddev
);
4801 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4802 do_md_stop(mddev
, 0, 0);
4807 * lets try to run arrays based on all disks that have arrived
4808 * until now. (those are in pending_raid_disks)
4810 * the method: pick the first pending disk, collect all disks with
4811 * the same UUID, remove all from the pending list and put them into
4812 * the 'same_array' list. Then order this list based on superblock
4813 * update time (freshest comes first), kick out 'old' disks and
4814 * compare superblocks. If everything's fine then run it.
4816 * If "unit" is allocated, then bump its reference count
4818 static void autorun_devices(int part
)
4820 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4822 char b
[BDEVNAME_SIZE
];
4824 printk(KERN_INFO
"md: autorun ...\n");
4825 while (!list_empty(&pending_raid_disks
)) {
4828 LIST_HEAD(candidates
);
4829 rdev0
= list_entry(pending_raid_disks
.next
,
4830 mdk_rdev_t
, same_set
);
4832 printk(KERN_INFO
"md: considering %s ...\n",
4833 bdevname(rdev0
->bdev
,b
));
4834 INIT_LIST_HEAD(&candidates
);
4835 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4836 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4837 printk(KERN_INFO
"md: adding %s ...\n",
4838 bdevname(rdev
->bdev
,b
));
4839 list_move(&rdev
->same_set
, &candidates
);
4842 * now we have a set of devices, with all of them having
4843 * mostly sane superblocks. It's time to allocate the
4847 dev
= MKDEV(mdp_major
,
4848 rdev0
->preferred_minor
<< MdpMinorShift
);
4849 unit
= MINOR(dev
) >> MdpMinorShift
;
4851 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4854 if (rdev0
->preferred_minor
!= unit
) {
4855 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4856 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4860 md_probe(dev
, NULL
, NULL
);
4861 mddev
= mddev_find(dev
);
4862 if (!mddev
|| !mddev
->gendisk
) {
4866 "md: cannot allocate memory for md drive.\n");
4869 if (mddev_lock(mddev
))
4870 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4872 else if (mddev
->raid_disks
|| mddev
->major_version
4873 || !list_empty(&mddev
->disks
)) {
4875 "md: %s already running, cannot run %s\n",
4876 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
4877 mddev_unlock(mddev
);
4879 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
4880 mddev
->persistent
= 1;
4881 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4882 list_del_init(&rdev
->same_set
);
4883 if (bind_rdev_to_array(rdev
, mddev
))
4886 autorun_array(mddev
);
4887 mddev_unlock(mddev
);
4889 /* on success, candidates will be empty, on error
4892 rdev_for_each_list(rdev
, tmp
, &candidates
) {
4893 list_del_init(&rdev
->same_set
);
4898 printk(KERN_INFO
"md: ... autorun DONE.\n");
4900 #endif /* !MODULE */
4902 static int get_version(void __user
* arg
)
4906 ver
.major
= MD_MAJOR_VERSION
;
4907 ver
.minor
= MD_MINOR_VERSION
;
4908 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
4910 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
4916 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
4918 mdu_array_info_t info
;
4919 int nr
,working
,insync
,failed
,spare
;
4922 nr
=working
=insync
=failed
=spare
=0;
4923 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4925 if (test_bit(Faulty
, &rdev
->flags
))
4929 if (test_bit(In_sync
, &rdev
->flags
))
4936 info
.major_version
= mddev
->major_version
;
4937 info
.minor_version
= mddev
->minor_version
;
4938 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
4939 info
.ctime
= mddev
->ctime
;
4940 info
.level
= mddev
->level
;
4941 info
.size
= mddev
->dev_sectors
/ 2;
4942 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
4945 info
.raid_disks
= mddev
->raid_disks
;
4946 info
.md_minor
= mddev
->md_minor
;
4947 info
.not_persistent
= !mddev
->persistent
;
4949 info
.utime
= mddev
->utime
;
4952 info
.state
= (1<<MD_SB_CLEAN
);
4953 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
4954 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
4955 info
.active_disks
= insync
;
4956 info
.working_disks
= working
;
4957 info
.failed_disks
= failed
;
4958 info
.spare_disks
= spare
;
4960 info
.layout
= mddev
->layout
;
4961 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
4963 if (copy_to_user(arg
, &info
, sizeof(info
)))
4969 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
4971 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
4972 char *ptr
, *buf
= NULL
;
4975 if (md_allow_write(mddev
))
4976 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
4978 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
4983 /* bitmap disabled, zero the first byte and copy out */
4984 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
4985 file
->pathname
[0] = '\0';
4989 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
4993 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
4997 strcpy(file
->pathname
, ptr
);
5001 if (copy_to_user(arg
, file
, sizeof(*file
)))
5009 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5011 mdu_disk_info_t info
;
5014 if (copy_from_user(&info
, arg
, sizeof(info
)))
5017 rdev
= find_rdev_nr(mddev
, info
.number
);
5019 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5020 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5021 info
.raid_disk
= rdev
->raid_disk
;
5023 if (test_bit(Faulty
, &rdev
->flags
))
5024 info
.state
|= (1<<MD_DISK_FAULTY
);
5025 else if (test_bit(In_sync
, &rdev
->flags
)) {
5026 info
.state
|= (1<<MD_DISK_ACTIVE
);
5027 info
.state
|= (1<<MD_DISK_SYNC
);
5029 if (test_bit(WriteMostly
, &rdev
->flags
))
5030 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5032 info
.major
= info
.minor
= 0;
5033 info
.raid_disk
= -1;
5034 info
.state
= (1<<MD_DISK_REMOVED
);
5037 if (copy_to_user(arg
, &info
, sizeof(info
)))
5043 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5045 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5047 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5049 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5052 if (!mddev
->raid_disks
) {
5054 /* expecting a device which has a superblock */
5055 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5058 "md: md_import_device returned %ld\n",
5060 return PTR_ERR(rdev
);
5062 if (!list_empty(&mddev
->disks
)) {
5063 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5064 mdk_rdev_t
, same_set
);
5065 err
= super_types
[mddev
->major_version
]
5066 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5069 "md: %s has different UUID to %s\n",
5070 bdevname(rdev
->bdev
,b
),
5071 bdevname(rdev0
->bdev
,b2
));
5076 err
= bind_rdev_to_array(rdev
, mddev
);
5083 * add_new_disk can be used once the array is assembled
5084 * to add "hot spares". They must already have a superblock
5089 if (!mddev
->pers
->hot_add_disk
) {
5091 "%s: personality does not support diskops!\n",
5095 if (mddev
->persistent
)
5096 rdev
= md_import_device(dev
, mddev
->major_version
,
5097 mddev
->minor_version
);
5099 rdev
= md_import_device(dev
, -1, -1);
5102 "md: md_import_device returned %ld\n",
5104 return PTR_ERR(rdev
);
5106 /* set save_raid_disk if appropriate */
5107 if (!mddev
->persistent
) {
5108 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5109 info
->raid_disk
< mddev
->raid_disks
)
5110 rdev
->raid_disk
= info
->raid_disk
;
5112 rdev
->raid_disk
= -1;
5114 super_types
[mddev
->major_version
].
5115 validate_super(mddev
, rdev
);
5116 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5118 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5119 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5120 set_bit(WriteMostly
, &rdev
->flags
);
5122 clear_bit(WriteMostly
, &rdev
->flags
);
5124 rdev
->raid_disk
= -1;
5125 err
= bind_rdev_to_array(rdev
, mddev
);
5126 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5127 /* If there is hot_add_disk but no hot_remove_disk
5128 * then added disks for geometry changes,
5129 * and should be added immediately.
5131 super_types
[mddev
->major_version
].
5132 validate_super(mddev
, rdev
);
5133 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5135 unbind_rdev_from_array(rdev
);
5140 sysfs_notify_dirent(rdev
->sysfs_state
);
5142 md_update_sb(mddev
, 1);
5143 if (mddev
->degraded
)
5144 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5145 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5146 md_wakeup_thread(mddev
->thread
);
5150 /* otherwise, add_new_disk is only allowed
5151 * for major_version==0 superblocks
5153 if (mddev
->major_version
!= 0) {
5154 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5159 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5161 rdev
= md_import_device(dev
, -1, 0);
5164 "md: error, md_import_device() returned %ld\n",
5166 return PTR_ERR(rdev
);
5168 rdev
->desc_nr
= info
->number
;
5169 if (info
->raid_disk
< mddev
->raid_disks
)
5170 rdev
->raid_disk
= info
->raid_disk
;
5172 rdev
->raid_disk
= -1;
5174 if (rdev
->raid_disk
< mddev
->raid_disks
)
5175 if (info
->state
& (1<<MD_DISK_SYNC
))
5176 set_bit(In_sync
, &rdev
->flags
);
5178 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5179 set_bit(WriteMostly
, &rdev
->flags
);
5181 if (!mddev
->persistent
) {
5182 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5183 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5185 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5186 rdev
->sectors
= rdev
->sb_start
;
5188 err
= bind_rdev_to_array(rdev
, mddev
);
5198 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5200 char b
[BDEVNAME_SIZE
];
5203 rdev
= find_rdev(mddev
, dev
);
5207 if (rdev
->raid_disk
>= 0)
5210 kick_rdev_from_array(rdev
);
5211 md_update_sb(mddev
, 1);
5212 md_new_event(mddev
);
5216 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5217 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5221 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5223 char b
[BDEVNAME_SIZE
];
5230 if (mddev
->major_version
!= 0) {
5231 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5232 " version-0 superblocks.\n",
5236 if (!mddev
->pers
->hot_add_disk
) {
5238 "%s: personality does not support diskops!\n",
5243 rdev
= md_import_device(dev
, -1, 0);
5246 "md: error, md_import_device() returned %ld\n",
5251 if (mddev
->persistent
)
5252 rdev
->sb_start
= calc_dev_sboffset(rdev
->bdev
);
5254 rdev
->sb_start
= rdev
->bdev
->bd_inode
->i_size
/ 512;
5256 rdev
->sectors
= rdev
->sb_start
;
5258 if (test_bit(Faulty
, &rdev
->flags
)) {
5260 "md: can not hot-add faulty %s disk to %s!\n",
5261 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5265 clear_bit(In_sync
, &rdev
->flags
);
5267 rdev
->saved_raid_disk
= -1;
5268 err
= bind_rdev_to_array(rdev
, mddev
);
5273 * The rest should better be atomic, we can have disk failures
5274 * noticed in interrupt contexts ...
5277 rdev
->raid_disk
= -1;
5279 md_update_sb(mddev
, 1);
5282 * Kick recovery, maybe this spare has to be added to the
5283 * array immediately.
5285 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5286 md_wakeup_thread(mddev
->thread
);
5287 md_new_event(mddev
);
5295 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5300 if (!mddev
->pers
->quiesce
)
5302 if (mddev
->recovery
|| mddev
->sync_thread
)
5304 /* we should be able to change the bitmap.. */
5310 return -EEXIST
; /* cannot add when bitmap is present */
5311 mddev
->bitmap_info
.file
= fget(fd
);
5313 if (mddev
->bitmap_info
.file
== NULL
) {
5314 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5319 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5321 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5323 fput(mddev
->bitmap_info
.file
);
5324 mddev
->bitmap_info
.file
= NULL
;
5327 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5328 } else if (mddev
->bitmap
== NULL
)
5329 return -ENOENT
; /* cannot remove what isn't there */
5332 mddev
->pers
->quiesce(mddev
, 1);
5334 err
= bitmap_create(mddev
);
5335 if (fd
< 0 || err
) {
5336 bitmap_destroy(mddev
);
5337 fd
= -1; /* make sure to put the file */
5339 mddev
->pers
->quiesce(mddev
, 0);
5342 if (mddev
->bitmap_info
.file
) {
5343 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5344 fput(mddev
->bitmap_info
.file
);
5346 mddev
->bitmap_info
.file
= NULL
;
5353 * set_array_info is used two different ways
5354 * The original usage is when creating a new array.
5355 * In this usage, raid_disks is > 0 and it together with
5356 * level, size, not_persistent,layout,chunksize determine the
5357 * shape of the array.
5358 * This will always create an array with a type-0.90.0 superblock.
5359 * The newer usage is when assembling an array.
5360 * In this case raid_disks will be 0, and the major_version field is
5361 * use to determine which style super-blocks are to be found on the devices.
5362 * The minor and patch _version numbers are also kept incase the
5363 * super_block handler wishes to interpret them.
5365 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5368 if (info
->raid_disks
== 0) {
5369 /* just setting version number for superblock loading */
5370 if (info
->major_version
< 0 ||
5371 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5372 super_types
[info
->major_version
].name
== NULL
) {
5373 /* maybe try to auto-load a module? */
5375 "md: superblock version %d not known\n",
5376 info
->major_version
);
5379 mddev
->major_version
= info
->major_version
;
5380 mddev
->minor_version
= info
->minor_version
;
5381 mddev
->patch_version
= info
->patch_version
;
5382 mddev
->persistent
= !info
->not_persistent
;
5383 /* ensure mddev_put doesn't delete this now that there
5384 * is some minimal configuration.
5386 mddev
->ctime
= get_seconds();
5389 mddev
->major_version
= MD_MAJOR_VERSION
;
5390 mddev
->minor_version
= MD_MINOR_VERSION
;
5391 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5392 mddev
->ctime
= get_seconds();
5394 mddev
->level
= info
->level
;
5395 mddev
->clevel
[0] = 0;
5396 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5397 mddev
->raid_disks
= info
->raid_disks
;
5398 /* don't set md_minor, it is determined by which /dev/md* was
5401 if (info
->state
& (1<<MD_SB_CLEAN
))
5402 mddev
->recovery_cp
= MaxSector
;
5404 mddev
->recovery_cp
= 0;
5405 mddev
->persistent
= ! info
->not_persistent
;
5406 mddev
->external
= 0;
5408 mddev
->layout
= info
->layout
;
5409 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5411 mddev
->max_disks
= MD_SB_DISKS
;
5413 if (mddev
->persistent
)
5415 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5417 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5418 mddev
->bitmap_info
.offset
= 0;
5420 mddev
->reshape_position
= MaxSector
;
5423 * Generate a 128 bit UUID
5425 get_random_bytes(mddev
->uuid
, 16);
5427 mddev
->new_level
= mddev
->level
;
5428 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5429 mddev
->new_layout
= mddev
->layout
;
5430 mddev
->delta_disks
= 0;
5435 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5437 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5439 if (mddev
->external_size
)
5442 mddev
->array_sectors
= array_sectors
;
5444 EXPORT_SYMBOL(md_set_array_sectors
);
5446 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5450 int fit
= (num_sectors
== 0);
5452 if (mddev
->pers
->resize
== NULL
)
5454 /* The "num_sectors" is the number of sectors of each device that
5455 * is used. This can only make sense for arrays with redundancy.
5456 * linear and raid0 always use whatever space is available. We can only
5457 * consider changing this number if no resync or reconstruction is
5458 * happening, and if the new size is acceptable. It must fit before the
5459 * sb_start or, if that is <data_offset, it must fit before the size
5460 * of each device. If num_sectors is zero, we find the largest size
5464 if (mddev
->sync_thread
)
5467 /* Sorry, cannot grow a bitmap yet, just remove it,
5471 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5472 sector_t avail
= rdev
->sectors
;
5474 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5475 num_sectors
= avail
;
5476 if (avail
< num_sectors
)
5479 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5481 revalidate_disk(mddev
->gendisk
);
5485 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5488 /* change the number of raid disks */
5489 if (mddev
->pers
->check_reshape
== NULL
)
5491 if (raid_disks
<= 0 ||
5492 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5494 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5496 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5498 rv
= mddev
->pers
->check_reshape(mddev
);
5504 * update_array_info is used to change the configuration of an
5506 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5507 * fields in the info are checked against the array.
5508 * Any differences that cannot be handled will cause an error.
5509 * Normally, only one change can be managed at a time.
5511 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5517 /* calculate expected state,ignoring low bits */
5518 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5519 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5521 if (mddev
->major_version
!= info
->major_version
||
5522 mddev
->minor_version
!= info
->minor_version
||
5523 /* mddev->patch_version != info->patch_version || */
5524 mddev
->ctime
!= info
->ctime
||
5525 mddev
->level
!= info
->level
||
5526 /* mddev->layout != info->layout || */
5527 !mddev
->persistent
!= info
->not_persistent
||
5528 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5529 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5530 ((state
^info
->state
) & 0xfffffe00)
5533 /* Check there is only one change */
5534 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5536 if (mddev
->raid_disks
!= info
->raid_disks
)
5538 if (mddev
->layout
!= info
->layout
)
5540 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5547 if (mddev
->layout
!= info
->layout
) {
5549 * we don't need to do anything at the md level, the
5550 * personality will take care of it all.
5552 if (mddev
->pers
->check_reshape
== NULL
)
5555 mddev
->new_layout
= info
->layout
;
5556 rv
= mddev
->pers
->check_reshape(mddev
);
5558 mddev
->new_layout
= mddev
->layout
;
5562 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5563 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5565 if (mddev
->raid_disks
!= info
->raid_disks
)
5566 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5568 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5569 if (mddev
->pers
->quiesce
== NULL
)
5571 if (mddev
->recovery
|| mddev
->sync_thread
)
5573 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5574 /* add the bitmap */
5577 if (mddev
->bitmap_info
.default_offset
== 0)
5579 mddev
->bitmap_info
.offset
=
5580 mddev
->bitmap_info
.default_offset
;
5581 mddev
->pers
->quiesce(mddev
, 1);
5582 rv
= bitmap_create(mddev
);
5584 bitmap_destroy(mddev
);
5585 mddev
->pers
->quiesce(mddev
, 0);
5587 /* remove the bitmap */
5590 if (mddev
->bitmap
->file
)
5592 mddev
->pers
->quiesce(mddev
, 1);
5593 bitmap_destroy(mddev
);
5594 mddev
->pers
->quiesce(mddev
, 0);
5595 mddev
->bitmap_info
.offset
= 0;
5598 md_update_sb(mddev
, 1);
5602 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5606 if (mddev
->pers
== NULL
)
5609 rdev
= find_rdev(mddev
, dev
);
5613 md_error(mddev
, rdev
);
5618 * We have a problem here : there is no easy way to give a CHS
5619 * virtual geometry. We currently pretend that we have a 2 heads
5620 * 4 sectors (with a BIG number of cylinders...). This drives
5621 * dosfs just mad... ;-)
5623 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5625 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5629 geo
->cylinders
= mddev
->array_sectors
/ 8;
5633 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5634 unsigned int cmd
, unsigned long arg
)
5637 void __user
*argp
= (void __user
*)arg
;
5638 mddev_t
*mddev
= NULL
;
5641 if (!capable(CAP_SYS_ADMIN
))
5645 * Commands dealing with the RAID driver but not any
5651 err
= get_version(argp
);
5654 case PRINT_RAID_DEBUG
:
5662 autostart_arrays(arg
);
5669 * Commands creating/starting a new array:
5672 mddev
= bdev
->bd_disk
->private_data
;
5679 err
= mddev_lock(mddev
);
5682 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5689 case SET_ARRAY_INFO
:
5691 mdu_array_info_t info
;
5693 memset(&info
, 0, sizeof(info
));
5694 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5699 err
= update_array_info(mddev
, &info
);
5701 printk(KERN_WARNING
"md: couldn't update"
5702 " array info. %d\n", err
);
5707 if (!list_empty(&mddev
->disks
)) {
5709 "md: array %s already has disks!\n",
5714 if (mddev
->raid_disks
) {
5716 "md: array %s already initialised!\n",
5721 err
= set_array_info(mddev
, &info
);
5723 printk(KERN_WARNING
"md: couldn't set"
5724 " array info. %d\n", err
);
5734 * Commands querying/configuring an existing array:
5736 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5737 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5738 if ((!mddev
->raid_disks
&& !mddev
->external
)
5739 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5740 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5741 && cmd
!= GET_BITMAP_FILE
) {
5747 * Commands even a read-only array can execute:
5751 case GET_ARRAY_INFO
:
5752 err
= get_array_info(mddev
, argp
);
5755 case GET_BITMAP_FILE
:
5756 err
= get_bitmap_file(mddev
, argp
);
5760 err
= get_disk_info(mddev
, argp
);
5763 case RESTART_ARRAY_RW
:
5764 err
= restart_array(mddev
);
5768 err
= do_md_stop(mddev
, 0, 1);
5772 err
= md_set_readonly(mddev
, 1);
5776 if (get_user(ro
, (int __user
*)(arg
))) {
5782 /* if the bdev is going readonly the value of mddev->ro
5783 * does not matter, no writes are coming
5788 /* are we are already prepared for writes? */
5792 /* transitioning to readauto need only happen for
5793 * arrays that call md_write_start
5796 err
= restart_array(mddev
);
5799 set_disk_ro(mddev
->gendisk
, 0);
5806 * The remaining ioctls are changing the state of the
5807 * superblock, so we do not allow them on read-only arrays.
5808 * However non-MD ioctls (e.g. get-size) will still come through
5809 * here and hit the 'default' below, so only disallow
5810 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5812 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5813 if (mddev
->ro
== 2) {
5815 sysfs_notify_dirent(mddev
->sysfs_state
);
5816 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5817 md_wakeup_thread(mddev
->thread
);
5828 mdu_disk_info_t info
;
5829 if (copy_from_user(&info
, argp
, sizeof(info
)))
5832 err
= add_new_disk(mddev
, &info
);
5836 case HOT_REMOVE_DISK
:
5837 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5841 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5844 case SET_DISK_FAULTY
:
5845 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5849 err
= do_md_run(mddev
);
5852 case SET_BITMAP_FILE
:
5853 err
= set_bitmap_file(mddev
, (int)arg
);
5863 if (mddev
->hold_active
== UNTIL_IOCTL
&&
5865 mddev
->hold_active
= 0;
5866 mddev_unlock(mddev
);
5875 #ifdef CONFIG_COMPAT
5876 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
5877 unsigned int cmd
, unsigned long arg
)
5880 case HOT_REMOVE_DISK
:
5882 case SET_DISK_FAULTY
:
5883 case SET_BITMAP_FILE
:
5884 /* These take in integer arg, do not convert */
5887 arg
= (unsigned long)compat_ptr(arg
);
5891 return md_ioctl(bdev
, mode
, cmd
, arg
);
5893 #endif /* CONFIG_COMPAT */
5895 static int md_open(struct block_device
*bdev
, fmode_t mode
)
5898 * Succeed if we can lock the mddev, which confirms that
5899 * it isn't being stopped right now.
5901 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
5904 if (mddev
->gendisk
!= bdev
->bd_disk
) {
5905 /* we are racing with mddev_put which is discarding this
5909 /* Wait until bdev->bd_disk is definitely gone */
5910 flush_scheduled_work();
5911 /* Then retry the open from the top */
5912 return -ERESTARTSYS
;
5914 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
5916 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
5920 atomic_inc(&mddev
->openers
);
5921 mutex_unlock(&mddev
->open_mutex
);
5923 check_disk_size_change(mddev
->gendisk
, bdev
);
5928 static int md_release(struct gendisk
*disk
, fmode_t mode
)
5930 mddev_t
*mddev
= disk
->private_data
;
5933 atomic_dec(&mddev
->openers
);
5938 static const struct block_device_operations md_fops
=
5940 .owner
= THIS_MODULE
,
5942 .release
= md_release
,
5944 #ifdef CONFIG_COMPAT
5945 .compat_ioctl
= md_compat_ioctl
,
5947 .getgeo
= md_getgeo
,
5950 static int md_thread(void * arg
)
5952 mdk_thread_t
*thread
= arg
;
5955 * md_thread is a 'system-thread', it's priority should be very
5956 * high. We avoid resource deadlocks individually in each
5957 * raid personality. (RAID5 does preallocation) We also use RR and
5958 * the very same RT priority as kswapd, thus we will never get
5959 * into a priority inversion deadlock.
5961 * we definitely have to have equal or higher priority than
5962 * bdflush, otherwise bdflush will deadlock if there are too
5963 * many dirty RAID5 blocks.
5966 allow_signal(SIGKILL
);
5967 while (!kthread_should_stop()) {
5969 /* We need to wait INTERRUPTIBLE so that
5970 * we don't add to the load-average.
5971 * That means we need to be sure no signals are
5974 if (signal_pending(current
))
5975 flush_signals(current
);
5977 wait_event_interruptible_timeout
5979 test_bit(THREAD_WAKEUP
, &thread
->flags
)
5980 || kthread_should_stop(),
5983 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
5985 thread
->run(thread
->mddev
);
5991 void md_wakeup_thread(mdk_thread_t
*thread
)
5994 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
5995 set_bit(THREAD_WAKEUP
, &thread
->flags
);
5996 wake_up(&thread
->wqueue
);
6000 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6003 mdk_thread_t
*thread
;
6005 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6009 init_waitqueue_head(&thread
->wqueue
);
6012 thread
->mddev
= mddev
;
6013 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6014 thread
->tsk
= kthread_run(md_thread
, thread
,
6016 mdname(thread
->mddev
),
6017 name
?: mddev
->pers
->name
);
6018 if (IS_ERR(thread
->tsk
)) {
6025 void md_unregister_thread(mdk_thread_t
*thread
)
6029 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6031 kthread_stop(thread
->tsk
);
6035 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6042 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6045 if (mddev
->external
)
6046 set_bit(Blocked
, &rdev
->flags
);
6048 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6050 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6051 __builtin_return_address(0),__builtin_return_address(1),
6052 __builtin_return_address(2),__builtin_return_address(3));
6056 if (!mddev
->pers
->error_handler
)
6058 mddev
->pers
->error_handler(mddev
,rdev
);
6059 if (mddev
->degraded
)
6060 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6061 sysfs_notify_dirent(rdev
->sysfs_state
);
6062 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6063 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6064 md_wakeup_thread(mddev
->thread
);
6065 md_new_event_inintr(mddev
);
6068 /* seq_file implementation /proc/mdstat */
6070 static void status_unused(struct seq_file
*seq
)
6075 seq_printf(seq
, "unused devices: ");
6077 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6078 char b
[BDEVNAME_SIZE
];
6080 seq_printf(seq
, "%s ",
6081 bdevname(rdev
->bdev
,b
));
6084 seq_printf(seq
, "<none>");
6086 seq_printf(seq
, "\n");
6090 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6092 sector_t max_sectors
, resync
, res
;
6093 unsigned long dt
, db
;
6096 unsigned int per_milli
;
6098 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6100 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6101 max_sectors
= mddev
->resync_max_sectors
;
6103 max_sectors
= mddev
->dev_sectors
;
6106 * Should not happen.
6112 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6113 * in a sector_t, and (max_sectors>>scale) will fit in a
6114 * u32, as those are the requirements for sector_div.
6115 * Thus 'scale' must be at least 10
6118 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6119 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6122 res
= (resync
>>scale
)*1000;
6123 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6127 int i
, x
= per_milli
/50, y
= 20-x
;
6128 seq_printf(seq
, "[");
6129 for (i
= 0; i
< x
; i
++)
6130 seq_printf(seq
, "=");
6131 seq_printf(seq
, ">");
6132 for (i
= 0; i
< y
; i
++)
6133 seq_printf(seq
, ".");
6134 seq_printf(seq
, "] ");
6136 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6137 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6139 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6141 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6142 "resync" : "recovery"))),
6143 per_milli
/10, per_milli
% 10,
6144 (unsigned long long) resync
/2,
6145 (unsigned long long) max_sectors
/2);
6148 * dt: time from mark until now
6149 * db: blocks written from mark until now
6150 * rt: remaining time
6152 * rt is a sector_t, so could be 32bit or 64bit.
6153 * So we divide before multiply in case it is 32bit and close
6155 * We scale the divisor (db) by 32 to avoid loosing precision
6156 * near the end of resync when the number of remaining sectors
6158 * We then divide rt by 32 after multiplying by db to compensate.
6159 * The '+1' avoids division by zero if db is very small.
6161 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6163 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6164 - mddev
->resync_mark_cnt
;
6166 rt
= max_sectors
- resync
; /* number of remaining sectors */
6167 sector_div(rt
, db
/32+1);
6171 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6172 ((unsigned long)rt
% 60)/6);
6174 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6177 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6179 struct list_head
*tmp
;
6189 spin_lock(&all_mddevs_lock
);
6190 list_for_each(tmp
,&all_mddevs
)
6192 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6194 spin_unlock(&all_mddevs_lock
);
6197 spin_unlock(&all_mddevs_lock
);
6199 return (void*)2;/* tail */
6203 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6205 struct list_head
*tmp
;
6206 mddev_t
*next_mddev
, *mddev
= v
;
6212 spin_lock(&all_mddevs_lock
);
6214 tmp
= all_mddevs
.next
;
6216 tmp
= mddev
->all_mddevs
.next
;
6217 if (tmp
!= &all_mddevs
)
6218 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6220 next_mddev
= (void*)2;
6223 spin_unlock(&all_mddevs_lock
);
6231 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6235 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6239 struct mdstat_info
{
6243 static int md_seq_show(struct seq_file
*seq
, void *v
)
6248 struct mdstat_info
*mi
= seq
->private;
6249 struct bitmap
*bitmap
;
6251 if (v
== (void*)1) {
6252 struct mdk_personality
*pers
;
6253 seq_printf(seq
, "Personalities : ");
6254 spin_lock(&pers_lock
);
6255 list_for_each_entry(pers
, &pers_list
, list
)
6256 seq_printf(seq
, "[%s] ", pers
->name
);
6258 spin_unlock(&pers_lock
);
6259 seq_printf(seq
, "\n");
6260 mi
->event
= atomic_read(&md_event_count
);
6263 if (v
== (void*)2) {
6268 if (mddev_lock(mddev
) < 0)
6271 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6272 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6273 mddev
->pers
? "" : "in");
6276 seq_printf(seq
, " (read-only)");
6278 seq_printf(seq
, " (auto-read-only)");
6279 seq_printf(seq
, " %s", mddev
->pers
->name
);
6283 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6284 char b
[BDEVNAME_SIZE
];
6285 seq_printf(seq
, " %s[%d]",
6286 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6287 if (test_bit(WriteMostly
, &rdev
->flags
))
6288 seq_printf(seq
, "(W)");
6289 if (test_bit(Faulty
, &rdev
->flags
)) {
6290 seq_printf(seq
, "(F)");
6292 } else if (rdev
->raid_disk
< 0)
6293 seq_printf(seq
, "(S)"); /* spare */
6294 sectors
+= rdev
->sectors
;
6297 if (!list_empty(&mddev
->disks
)) {
6299 seq_printf(seq
, "\n %llu blocks",
6300 (unsigned long long)
6301 mddev
->array_sectors
/ 2);
6303 seq_printf(seq
, "\n %llu blocks",
6304 (unsigned long long)sectors
/ 2);
6306 if (mddev
->persistent
) {
6307 if (mddev
->major_version
!= 0 ||
6308 mddev
->minor_version
!= 90) {
6309 seq_printf(seq
," super %d.%d",
6310 mddev
->major_version
,
6311 mddev
->minor_version
);
6313 } else if (mddev
->external
)
6314 seq_printf(seq
, " super external:%s",
6315 mddev
->metadata_type
);
6317 seq_printf(seq
, " super non-persistent");
6320 mddev
->pers
->status(seq
, mddev
);
6321 seq_printf(seq
, "\n ");
6322 if (mddev
->pers
->sync_request
) {
6323 if (mddev
->curr_resync
> 2) {
6324 status_resync(seq
, mddev
);
6325 seq_printf(seq
, "\n ");
6326 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6327 seq_printf(seq
, "\tresync=DELAYED\n ");
6328 else if (mddev
->recovery_cp
< MaxSector
)
6329 seq_printf(seq
, "\tresync=PENDING\n ");
6332 seq_printf(seq
, "\n ");
6334 if ((bitmap
= mddev
->bitmap
)) {
6335 unsigned long chunk_kb
;
6336 unsigned long flags
;
6337 spin_lock_irqsave(&bitmap
->lock
, flags
);
6338 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6339 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6341 bitmap
->pages
- bitmap
->missing_pages
,
6343 (bitmap
->pages
- bitmap
->missing_pages
)
6344 << (PAGE_SHIFT
- 10),
6345 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6346 chunk_kb
? "KB" : "B");
6348 seq_printf(seq
, ", file: ");
6349 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6352 seq_printf(seq
, "\n");
6353 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6356 seq_printf(seq
, "\n");
6358 mddev_unlock(mddev
);
6363 static const struct seq_operations md_seq_ops
= {
6364 .start
= md_seq_start
,
6365 .next
= md_seq_next
,
6366 .stop
= md_seq_stop
,
6367 .show
= md_seq_show
,
6370 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6373 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6377 error
= seq_open(file
, &md_seq_ops
);
6381 struct seq_file
*p
= file
->private_data
;
6383 mi
->event
= atomic_read(&md_event_count
);
6388 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6390 struct seq_file
*m
= filp
->private_data
;
6391 struct mdstat_info
*mi
= m
->private;
6394 poll_wait(filp
, &md_event_waiters
, wait
);
6396 /* always allow read */
6397 mask
= POLLIN
| POLLRDNORM
;
6399 if (mi
->event
!= atomic_read(&md_event_count
))
6400 mask
|= POLLERR
| POLLPRI
;
6404 static const struct file_operations md_seq_fops
= {
6405 .owner
= THIS_MODULE
,
6406 .open
= md_seq_open
,
6408 .llseek
= seq_lseek
,
6409 .release
= seq_release_private
,
6410 .poll
= mdstat_poll
,
6413 int register_md_personality(struct mdk_personality
*p
)
6415 spin_lock(&pers_lock
);
6416 list_add_tail(&p
->list
, &pers_list
);
6417 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6418 spin_unlock(&pers_lock
);
6422 int unregister_md_personality(struct mdk_personality
*p
)
6424 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6425 spin_lock(&pers_lock
);
6426 list_del_init(&p
->list
);
6427 spin_unlock(&pers_lock
);
6431 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6439 rdev_for_each_rcu(rdev
, mddev
) {
6440 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6441 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6442 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6443 atomic_read(&disk
->sync_io
);
6444 /* sync IO will cause sync_io to increase before the disk_stats
6445 * as sync_io is counted when a request starts, and
6446 * disk_stats is counted when it completes.
6447 * So resync activity will cause curr_events to be smaller than
6448 * when there was no such activity.
6449 * non-sync IO will cause disk_stat to increase without
6450 * increasing sync_io so curr_events will (eventually)
6451 * be larger than it was before. Once it becomes
6452 * substantially larger, the test below will cause
6453 * the array to appear non-idle, and resync will slow
6455 * If there is a lot of outstanding resync activity when
6456 * we set last_event to curr_events, then all that activity
6457 * completing might cause the array to appear non-idle
6458 * and resync will be slowed down even though there might
6459 * not have been non-resync activity. This will only
6460 * happen once though. 'last_events' will soon reflect
6461 * the state where there is little or no outstanding
6462 * resync requests, and further resync activity will
6463 * always make curr_events less than last_events.
6466 if (init
|| curr_events
- rdev
->last_events
> 64) {
6467 rdev
->last_events
= curr_events
;
6475 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6477 /* another "blocks" (512byte) blocks have been synced */
6478 atomic_sub(blocks
, &mddev
->recovery_active
);
6479 wake_up(&mddev
->recovery_wait
);
6481 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6482 md_wakeup_thread(mddev
->thread
);
6483 // stop recovery, signal do_sync ....
6488 /* md_write_start(mddev, bi)
6489 * If we need to update some array metadata (e.g. 'active' flag
6490 * in superblock) before writing, schedule a superblock update
6491 * and wait for it to complete.
6493 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6496 if (bio_data_dir(bi
) != WRITE
)
6499 BUG_ON(mddev
->ro
== 1);
6500 if (mddev
->ro
== 2) {
6501 /* need to switch to read/write */
6503 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6504 md_wakeup_thread(mddev
->thread
);
6505 md_wakeup_thread(mddev
->sync_thread
);
6508 atomic_inc(&mddev
->writes_pending
);
6509 if (mddev
->safemode
== 1)
6510 mddev
->safemode
= 0;
6511 if (mddev
->in_sync
) {
6512 spin_lock_irq(&mddev
->write_lock
);
6513 if (mddev
->in_sync
) {
6515 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6516 md_wakeup_thread(mddev
->thread
);
6519 spin_unlock_irq(&mddev
->write_lock
);
6522 sysfs_notify_dirent(mddev
->sysfs_state
);
6523 wait_event(mddev
->sb_wait
,
6524 !test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
) &&
6525 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6528 void md_write_end(mddev_t
*mddev
)
6530 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6531 if (mddev
->safemode
== 2)
6532 md_wakeup_thread(mddev
->thread
);
6533 else if (mddev
->safemode_delay
)
6534 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6538 /* md_allow_write(mddev)
6539 * Calling this ensures that the array is marked 'active' so that writes
6540 * may proceed without blocking. It is important to call this before
6541 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6542 * Must be called with mddev_lock held.
6544 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6545 * is dropped, so return -EAGAIN after notifying userspace.
6547 int md_allow_write(mddev_t
*mddev
)
6553 if (!mddev
->pers
->sync_request
)
6556 spin_lock_irq(&mddev
->write_lock
);
6557 if (mddev
->in_sync
) {
6559 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6560 if (mddev
->safemode_delay
&&
6561 mddev
->safemode
== 0)
6562 mddev
->safemode
= 1;
6563 spin_unlock_irq(&mddev
->write_lock
);
6564 md_update_sb(mddev
, 0);
6565 sysfs_notify_dirent(mddev
->sysfs_state
);
6567 spin_unlock_irq(&mddev
->write_lock
);
6569 if (test_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
6574 EXPORT_SYMBOL_GPL(md_allow_write
);
6576 #define SYNC_MARKS 10
6577 #define SYNC_MARK_STEP (3*HZ)
6578 void md_do_sync(mddev_t
*mddev
)
6581 unsigned int currspeed
= 0,
6583 sector_t max_sectors
,j
, io_sectors
;
6584 unsigned long mark
[SYNC_MARKS
];
6585 sector_t mark_cnt
[SYNC_MARKS
];
6587 struct list_head
*tmp
;
6588 sector_t last_check
;
6593 /* just incase thread restarts... */
6594 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6596 if (mddev
->ro
) /* never try to sync a read-only array */
6599 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6600 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6601 desc
= "data-check";
6602 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6603 desc
= "requested-resync";
6606 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6611 /* we overload curr_resync somewhat here.
6612 * 0 == not engaged in resync at all
6613 * 2 == checking that there is no conflict with another sync
6614 * 1 == like 2, but have yielded to allow conflicting resync to
6616 * other == active in resync - this many blocks
6618 * Before starting a resync we must have set curr_resync to
6619 * 2, and then checked that every "conflicting" array has curr_resync
6620 * less than ours. When we find one that is the same or higher
6621 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6622 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6623 * This will mean we have to start checking from the beginning again.
6628 mddev
->curr_resync
= 2;
6631 if (kthread_should_stop())
6632 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6634 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6636 for_each_mddev(mddev2
, tmp
) {
6637 if (mddev2
== mddev
)
6639 if (!mddev
->parallel_resync
6640 && mddev2
->curr_resync
6641 && match_mddev_units(mddev
, mddev2
)) {
6643 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6644 /* arbitrarily yield */
6645 mddev
->curr_resync
= 1;
6646 wake_up(&resync_wait
);
6648 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6649 /* no need to wait here, we can wait the next
6650 * time 'round when curr_resync == 2
6653 /* We need to wait 'interruptible' so as not to
6654 * contribute to the load average, and not to
6655 * be caught by 'softlockup'
6657 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6658 if (!kthread_should_stop() &&
6659 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6660 printk(KERN_INFO
"md: delaying %s of %s"
6661 " until %s has finished (they"
6662 " share one or more physical units)\n",
6663 desc
, mdname(mddev
), mdname(mddev2
));
6665 if (signal_pending(current
))
6666 flush_signals(current
);
6668 finish_wait(&resync_wait
, &wq
);
6671 finish_wait(&resync_wait
, &wq
);
6674 } while (mddev
->curr_resync
< 2);
6677 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6678 /* resync follows the size requested by the personality,
6679 * which defaults to physical size, but can be virtual size
6681 max_sectors
= mddev
->resync_max_sectors
;
6682 mddev
->resync_mismatches
= 0;
6683 /* we don't use the checkpoint if there's a bitmap */
6684 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6685 j
= mddev
->resync_min
;
6686 else if (!mddev
->bitmap
)
6687 j
= mddev
->recovery_cp
;
6689 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6690 max_sectors
= mddev
->dev_sectors
;
6692 /* recovery follows the physical size of devices */
6693 max_sectors
= mddev
->dev_sectors
;
6696 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6697 if (rdev
->raid_disk
>= 0 &&
6698 !test_bit(Faulty
, &rdev
->flags
) &&
6699 !test_bit(In_sync
, &rdev
->flags
) &&
6700 rdev
->recovery_offset
< j
)
6701 j
= rdev
->recovery_offset
;
6705 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6706 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6707 " %d KB/sec/disk.\n", speed_min(mddev
));
6708 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6709 "(but not more than %d KB/sec) for %s.\n",
6710 speed_max(mddev
), desc
);
6712 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6715 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6717 mark_cnt
[m
] = io_sectors
;
6720 mddev
->resync_mark
= mark
[last_mark
];
6721 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6724 * Tune reconstruction:
6726 window
= 32*(PAGE_SIZE
/512);
6727 printk(KERN_INFO
"md: using %dk window, over a total of %llu blocks.\n",
6728 window
/2,(unsigned long long) max_sectors
/2);
6730 atomic_set(&mddev
->recovery_active
, 0);
6735 "md: resuming %s of %s from checkpoint.\n",
6736 desc
, mdname(mddev
));
6737 mddev
->curr_resync
= j
;
6739 mddev
->curr_resync_completed
= mddev
->curr_resync
;
6741 while (j
< max_sectors
) {
6746 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6747 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6748 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6749 > (max_sectors
>> 4)) ||
6750 (j
- mddev
->curr_resync_completed
)*2
6751 >= mddev
->resync_max
- mddev
->curr_resync_completed
6753 /* time to update curr_resync_completed */
6754 blk_unplug(mddev
->queue
);
6755 wait_event(mddev
->recovery_wait
,
6756 atomic_read(&mddev
->recovery_active
) == 0);
6757 mddev
->curr_resync_completed
=
6759 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6760 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6763 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6764 /* As this condition is controlled by user-space,
6765 * we can block indefinitely, so use '_interruptible'
6766 * to avoid triggering warnings.
6768 flush_signals(current
); /* just in case */
6769 wait_event_interruptible(mddev
->recovery_wait
,
6770 mddev
->resync_max
> j
6771 || kthread_should_stop());
6774 if (kthread_should_stop())
6777 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6778 currspeed
< speed_min(mddev
));
6780 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6784 if (!skipped
) { /* actual IO requested */
6785 io_sectors
+= sectors
;
6786 atomic_add(sectors
, &mddev
->recovery_active
);
6790 if (j
>1) mddev
->curr_resync
= j
;
6791 mddev
->curr_mark_cnt
= io_sectors
;
6792 if (last_check
== 0)
6793 /* this is the earliers that rebuilt will be
6794 * visible in /proc/mdstat
6796 md_new_event(mddev
);
6798 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6801 last_check
= io_sectors
;
6803 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6807 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6809 int next
= (last_mark
+1) % SYNC_MARKS
;
6811 mddev
->resync_mark
= mark
[next
];
6812 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6813 mark
[next
] = jiffies
;
6814 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6819 if (kthread_should_stop())
6824 * this loop exits only if either when we are slower than
6825 * the 'hard' speed limit, or the system was IO-idle for
6827 * the system might be non-idle CPU-wise, but we only care
6828 * about not overloading the IO subsystem. (things like an
6829 * e2fsck being done on the RAID array should execute fast)
6831 blk_unplug(mddev
->queue
);
6834 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6835 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
6837 if (currspeed
> speed_min(mddev
)) {
6838 if ((currspeed
> speed_max(mddev
)) ||
6839 !is_mddev_idle(mddev
, 0)) {
6845 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
6847 * this also signals 'finished resyncing' to md_stop
6850 blk_unplug(mddev
->queue
);
6852 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
6854 /* tell personality that we are finished */
6855 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
6857 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
6858 mddev
->curr_resync
> 2) {
6859 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6860 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6861 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
6863 "md: checkpointing %s of %s.\n",
6864 desc
, mdname(mddev
));
6865 mddev
->recovery_cp
= mddev
->curr_resync
;
6868 mddev
->recovery_cp
= MaxSector
;
6870 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6871 mddev
->curr_resync
= MaxSector
;
6873 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6874 if (rdev
->raid_disk
>= 0 &&
6875 !test_bit(Faulty
, &rdev
->flags
) &&
6876 !test_bit(In_sync
, &rdev
->flags
) &&
6877 rdev
->recovery_offset
< mddev
->curr_resync
)
6878 rdev
->recovery_offset
= mddev
->curr_resync
;
6882 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6885 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
6886 /* We completed so min/max setting can be forgotten if used. */
6887 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6888 mddev
->resync_min
= 0;
6889 mddev
->resync_max
= MaxSector
;
6890 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6891 mddev
->resync_min
= mddev
->curr_resync_completed
;
6892 mddev
->curr_resync
= 0;
6893 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6894 mddev
->curr_resync_completed
= 0;
6895 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6896 wake_up(&resync_wait
);
6897 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
6898 md_wakeup_thread(mddev
->thread
);
6903 * got a signal, exit.
6906 "md: md_do_sync() got signal ... exiting\n");
6907 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6911 EXPORT_SYMBOL_GPL(md_do_sync
);
6914 static int remove_and_add_spares(mddev_t
*mddev
)
6919 mddev
->curr_resync_completed
= 0;
6921 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
6922 if (rdev
->raid_disk
>= 0 &&
6923 !test_bit(Blocked
, &rdev
->flags
) &&
6924 (test_bit(Faulty
, &rdev
->flags
) ||
6925 ! test_bit(In_sync
, &rdev
->flags
)) &&
6926 atomic_read(&rdev
->nr_pending
)==0) {
6927 if (mddev
->pers
->hot_remove_disk(
6928 mddev
, rdev
->raid_disk
)==0) {
6930 sprintf(nm
,"rd%d", rdev
->raid_disk
);
6931 sysfs_remove_link(&mddev
->kobj
, nm
);
6932 rdev
->raid_disk
= -1;
6936 if (mddev
->degraded
&& ! mddev
->ro
&& !mddev
->recovery_disabled
) {
6937 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6938 if (rdev
->raid_disk
>= 0 &&
6939 !test_bit(In_sync
, &rdev
->flags
) &&
6940 !test_bit(Blocked
, &rdev
->flags
))
6942 if (rdev
->raid_disk
< 0
6943 && !test_bit(Faulty
, &rdev
->flags
)) {
6944 rdev
->recovery_offset
= 0;
6946 hot_add_disk(mddev
, rdev
) == 0) {
6948 sprintf(nm
, "rd%d", rdev
->raid_disk
);
6949 if (sysfs_create_link(&mddev
->kobj
,
6952 "md: cannot register "
6956 md_new_event(mddev
);
6957 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6966 * This routine is regularly called by all per-raid-array threads to
6967 * deal with generic issues like resync and super-block update.
6968 * Raid personalities that don't have a thread (linear/raid0) do not
6969 * need this as they never do any recovery or update the superblock.
6971 * It does not do any resync itself, but rather "forks" off other threads
6972 * to do that as needed.
6973 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6974 * "->recovery" and create a thread at ->sync_thread.
6975 * When the thread finishes it sets MD_RECOVERY_DONE
6976 * and wakeups up this thread which will reap the thread and finish up.
6977 * This thread also removes any faulty devices (with nr_pending == 0).
6979 * The overall approach is:
6980 * 1/ if the superblock needs updating, update it.
6981 * 2/ If a recovery thread is running, don't do anything else.
6982 * 3/ If recovery has finished, clean up, possibly marking spares active.
6983 * 4/ If there are any faulty devices, remove them.
6984 * 5/ If array is degraded, try to add spares devices
6985 * 6/ If array has spares or is not in-sync, start a resync thread.
6987 void md_check_recovery(mddev_t
*mddev
)
6993 bitmap_daemon_work(mddev
);
6998 if (signal_pending(current
)) {
6999 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7000 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7002 mddev
->safemode
= 2;
7004 flush_signals(current
);
7007 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7010 (mddev
->flags
&& !mddev
->external
) ||
7011 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7012 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7013 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7014 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7015 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7019 if (mddev_trylock(mddev
)) {
7023 /* Only thing we do on a ro array is remove
7026 remove_and_add_spares(mddev
);
7027 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7031 if (!mddev
->external
) {
7033 spin_lock_irq(&mddev
->write_lock
);
7034 if (mddev
->safemode
&&
7035 !atomic_read(&mddev
->writes_pending
) &&
7037 mddev
->recovery_cp
== MaxSector
) {
7040 if (mddev
->persistent
)
7041 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7043 if (mddev
->safemode
== 1)
7044 mddev
->safemode
= 0;
7045 spin_unlock_irq(&mddev
->write_lock
);
7047 sysfs_notify_dirent(mddev
->sysfs_state
);
7051 md_update_sb(mddev
, 0);
7053 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7054 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7055 /* resync/recovery still happening */
7056 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7059 if (mddev
->sync_thread
) {
7060 /* resync has finished, collect result */
7061 md_unregister_thread(mddev
->sync_thread
);
7062 mddev
->sync_thread
= NULL
;
7063 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7064 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7066 /* activate any spares */
7067 if (mddev
->pers
->spare_active(mddev
))
7068 sysfs_notify(&mddev
->kobj
, NULL
,
7071 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7072 mddev
->pers
->finish_reshape
)
7073 mddev
->pers
->finish_reshape(mddev
);
7074 md_update_sb(mddev
, 1);
7076 /* if array is no-longer degraded, then any saved_raid_disk
7077 * information must be scrapped
7079 if (!mddev
->degraded
)
7080 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7081 rdev
->saved_raid_disk
= -1;
7083 mddev
->recovery
= 0;
7084 /* flag recovery needed just to double check */
7085 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7086 sysfs_notify_dirent(mddev
->sysfs_action
);
7087 md_new_event(mddev
);
7090 /* Set RUNNING before clearing NEEDED to avoid
7091 * any transients in the value of "sync_action".
7093 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7094 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7095 /* Clear some bits that don't mean anything, but
7098 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7099 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7101 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7103 /* no recovery is running.
7104 * remove any failed drives, then
7105 * add spares if possible.
7106 * Spare are also removed and re-added, to allow
7107 * the personality to fail the re-add.
7110 if (mddev
->reshape_position
!= MaxSector
) {
7111 if (mddev
->pers
->check_reshape
== NULL
||
7112 mddev
->pers
->check_reshape(mddev
) != 0)
7113 /* Cannot proceed */
7115 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7116 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7117 } else if ((spares
= remove_and_add_spares(mddev
))) {
7118 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7119 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7120 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7121 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7122 } else if (mddev
->recovery_cp
< MaxSector
) {
7123 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7124 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7125 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7126 /* nothing to be done ... */
7129 if (mddev
->pers
->sync_request
) {
7130 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7131 /* We are adding a device or devices to an array
7132 * which has the bitmap stored on all devices.
7133 * So make sure all bitmap pages get written
7135 bitmap_write_all(mddev
->bitmap
);
7137 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7140 if (!mddev
->sync_thread
) {
7141 printk(KERN_ERR
"%s: could not start resync"
7144 /* leave the spares where they are, it shouldn't hurt */
7145 mddev
->recovery
= 0;
7147 md_wakeup_thread(mddev
->sync_thread
);
7148 sysfs_notify_dirent(mddev
->sysfs_action
);
7149 md_new_event(mddev
);
7152 if (!mddev
->sync_thread
) {
7153 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7154 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7156 if (mddev
->sysfs_action
)
7157 sysfs_notify_dirent(mddev
->sysfs_action
);
7159 mddev_unlock(mddev
);
7163 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7165 sysfs_notify_dirent(rdev
->sysfs_state
);
7166 wait_event_timeout(rdev
->blocked_wait
,
7167 !test_bit(Blocked
, &rdev
->flags
),
7168 msecs_to_jiffies(5000));
7169 rdev_dec_pending(rdev
, mddev
);
7171 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7173 static int md_notify_reboot(struct notifier_block
*this,
7174 unsigned long code
, void *x
)
7176 struct list_head
*tmp
;
7179 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7181 printk(KERN_INFO
"md: stopping all md devices.\n");
7183 for_each_mddev(mddev
, tmp
)
7184 if (mddev_trylock(mddev
)) {
7185 /* Force a switch to readonly even array
7186 * appears to still be in use. Hence
7189 md_set_readonly(mddev
, 100);
7190 mddev_unlock(mddev
);
7193 * certain more exotic SCSI devices are known to be
7194 * volatile wrt too early system reboots. While the
7195 * right place to handle this issue is the given
7196 * driver, we do want to have a safe RAID driver ...
7203 static struct notifier_block md_notifier
= {
7204 .notifier_call
= md_notify_reboot
,
7206 .priority
= INT_MAX
, /* before any real devices */
7209 static void md_geninit(void)
7211 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7213 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7216 static int __init
md_init(void)
7218 if (register_blkdev(MD_MAJOR
, "md"))
7220 if ((mdp_major
=register_blkdev(0, "mdp"))<=0) {
7221 unregister_blkdev(MD_MAJOR
, "md");
7224 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7225 md_probe
, NULL
, NULL
);
7226 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7227 md_probe
, NULL
, NULL
);
7229 register_reboot_notifier(&md_notifier
);
7230 raid_table_header
= register_sysctl_table(raid_root_table
);
7240 * Searches all registered partitions for autorun RAID arrays
7244 static LIST_HEAD(all_detected_devices
);
7245 struct detected_devices_node
{
7246 struct list_head list
;
7250 void md_autodetect_dev(dev_t dev
)
7252 struct detected_devices_node
*node_detected_dev
;
7254 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7255 if (node_detected_dev
) {
7256 node_detected_dev
->dev
= dev
;
7257 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7259 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7260 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7265 static void autostart_arrays(int part
)
7268 struct detected_devices_node
*node_detected_dev
;
7270 int i_scanned
, i_passed
;
7275 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7277 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7279 node_detected_dev
= list_entry(all_detected_devices
.next
,
7280 struct detected_devices_node
, list
);
7281 list_del(&node_detected_dev
->list
);
7282 dev
= node_detected_dev
->dev
;
7283 kfree(node_detected_dev
);
7284 rdev
= md_import_device(dev
,0, 90);
7288 if (test_bit(Faulty
, &rdev
->flags
)) {
7292 set_bit(AutoDetected
, &rdev
->flags
);
7293 list_add(&rdev
->same_set
, &pending_raid_disks
);
7297 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7298 i_scanned
, i_passed
);
7300 autorun_devices(part
);
7303 #endif /* !MODULE */
7305 static __exit
void md_exit(void)
7308 struct list_head
*tmp
;
7310 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7311 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7313 unregister_blkdev(MD_MAJOR
,"md");
7314 unregister_blkdev(mdp_major
, "mdp");
7315 unregister_reboot_notifier(&md_notifier
);
7316 unregister_sysctl_table(raid_table_header
);
7317 remove_proc_entry("mdstat", NULL
);
7318 for_each_mddev(mddev
, tmp
) {
7319 export_array(mddev
);
7320 mddev
->hold_active
= 0;
7324 subsys_initcall(md_init
);
7325 module_exit(md_exit
)
7327 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7329 return sprintf(buffer
, "%d", start_readonly
);
7331 static int set_ro(const char *val
, struct kernel_param
*kp
)
7334 int num
= simple_strtoul(val
, &e
, 10);
7335 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7336 start_readonly
= num
;
7342 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7343 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7345 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7347 EXPORT_SYMBOL(register_md_personality
);
7348 EXPORT_SYMBOL(unregister_md_personality
);
7349 EXPORT_SYMBOL(md_error
);
7350 EXPORT_SYMBOL(md_done_sync
);
7351 EXPORT_SYMBOL(md_write_start
);
7352 EXPORT_SYMBOL(md_write_end
);
7353 EXPORT_SYMBOL(md_register_thread
);
7354 EXPORT_SYMBOL(md_unregister_thread
);
7355 EXPORT_SYMBOL(md_wakeup_thread
);
7356 EXPORT_SYMBOL(md_check_recovery
);
7357 MODULE_LICENSE("GPL");
7358 MODULE_DESCRIPTION("MD RAID framework");
7360 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);