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/mutex.h>
40 #include <linux/buffer_head.h> /* for invalidate_bdev */
41 #include <linux/poll.h>
42 #include <linux/ctype.h>
43 #include <linux/string.h>
44 #include <linux/hdreg.h>
45 #include <linux/proc_fs.h>
46 #include <linux/random.h>
47 #include <linux/reboot.h>
48 #include <linux/file.h>
49 #include <linux/compat.h>
50 #include <linux/delay.h>
51 #include <linux/raid/md_p.h>
52 #include <linux/raid/md_u.h>
53 #include <linux/slab.h>
58 #define dprintk(x...) ((void)(DEBUG && printk(x)))
61 static void autostart_arrays(int part
);
64 /* pers_list is a list of registered personalities protected
66 * pers_lock does extra service to protect accesses to
67 * mddev->thread when the mutex cannot be held.
69 static LIST_HEAD(pers_list
);
70 static DEFINE_SPINLOCK(pers_lock
);
72 static void md_print_devices(void);
74 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
75 static struct workqueue_struct
*md_wq
;
76 static struct workqueue_struct
*md_misc_wq
;
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min
= 1000;
100 static int sysctl_speed_limit_max
= 200000;
101 static inline int speed_min(mddev_t
*mddev
)
103 return mddev
->sync_speed_min
?
104 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
107 static inline int speed_max(mddev_t
*mddev
)
109 return mddev
->sync_speed_max
?
110 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
113 static struct ctl_table_header
*raid_table_header
;
115 static ctl_table raid_table
[] = {
117 .procname
= "speed_limit_min",
118 .data
= &sysctl_speed_limit_min
,
119 .maxlen
= sizeof(int),
120 .mode
= S_IRUGO
|S_IWUSR
,
121 .proc_handler
= proc_dointvec
,
124 .procname
= "speed_limit_max",
125 .data
= &sysctl_speed_limit_max
,
126 .maxlen
= sizeof(int),
127 .mode
= S_IRUGO
|S_IWUSR
,
128 .proc_handler
= proc_dointvec
,
133 static ctl_table raid_dir_table
[] = {
137 .mode
= S_IRUGO
|S_IXUGO
,
143 static ctl_table raid_root_table
[] = {
148 .child
= raid_dir_table
,
153 static const struct block_device_operations md_fops
;
155 static int start_readonly
;
158 * like bio_clone, but with a local bio set
161 static void mddev_bio_destructor(struct bio
*bio
)
163 mddev_t
*mddev
, **mddevp
;
168 bio_free(bio
, mddev
->bio_set
);
171 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
177 if (!mddev
|| !mddev
->bio_set
)
178 return bio_alloc(gfp_mask
, nr_iovecs
);
180 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
,
186 b
->bi_destructor
= mddev_bio_destructor
;
189 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
191 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
197 if (!mddev
|| !mddev
->bio_set
)
198 return bio_clone(bio
, gfp_mask
);
200 b
= bio_alloc_bioset(gfp_mask
, bio
->bi_max_vecs
,
206 b
->bi_destructor
= mddev_bio_destructor
;
208 if (bio_integrity(bio
)) {
211 ret
= bio_integrity_clone(b
, bio
, gfp_mask
, mddev
->bio_set
);
221 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
224 * We have a system wide 'event count' that is incremented
225 * on any 'interesting' event, and readers of /proc/mdstat
226 * can use 'poll' or 'select' to find out when the event
230 * start array, stop array, error, add device, remove device,
231 * start build, activate spare
233 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
234 static atomic_t md_event_count
;
235 void md_new_event(mddev_t
*mddev
)
237 atomic_inc(&md_event_count
);
238 wake_up(&md_event_waiters
);
240 EXPORT_SYMBOL_GPL(md_new_event
);
242 /* Alternate version that can be called from interrupts
243 * when calling sysfs_notify isn't needed.
245 static void md_new_event_inintr(mddev_t
*mddev
)
247 atomic_inc(&md_event_count
);
248 wake_up(&md_event_waiters
);
252 * Enables to iterate over all existing md arrays
253 * all_mddevs_lock protects this list.
255 static LIST_HEAD(all_mddevs
);
256 static DEFINE_SPINLOCK(all_mddevs_lock
);
260 * iterates through all used mddevs in the system.
261 * We take care to grab the all_mddevs_lock whenever navigating
262 * the list, and to always hold a refcount when unlocked.
263 * Any code which breaks out of this loop while own
264 * a reference to the current mddev and must mddev_put it.
266 #define for_each_mddev(mddev,tmp) \
268 for (({ spin_lock(&all_mddevs_lock); \
269 tmp = all_mddevs.next; \
271 ({ if (tmp != &all_mddevs) \
272 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
273 spin_unlock(&all_mddevs_lock); \
274 if (mddev) mddev_put(mddev); \
275 mddev = list_entry(tmp, mddev_t, all_mddevs); \
276 tmp != &all_mddevs;}); \
277 ({ spin_lock(&all_mddevs_lock); \
282 /* Rather than calling directly into the personality make_request function,
283 * IO requests come here first so that we can check if the device is
284 * being suspended pending a reconfiguration.
285 * We hold a refcount over the call to ->make_request. By the time that
286 * call has finished, the bio has been linked into some internal structure
287 * and so is visible to ->quiesce(), so we don't need the refcount any more.
289 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
291 const int rw
= bio_data_dir(bio
);
292 mddev_t
*mddev
= q
->queuedata
;
295 unsigned int sectors
;
297 if (mddev
== NULL
|| mddev
->pers
== NULL
302 smp_rmb(); /* Ensure implications of 'active' are visible */
304 if (mddev
->suspended
) {
307 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
308 TASK_UNINTERRUPTIBLE
);
309 if (!mddev
->suspended
)
315 finish_wait(&mddev
->sb_wait
, &__wait
);
317 atomic_inc(&mddev
->active_io
);
321 * save the sectors now since our bio can
322 * go away inside make_request
324 sectors
= bio_sectors(bio
);
325 rv
= mddev
->pers
->make_request(mddev
, bio
);
327 cpu
= part_stat_lock();
328 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
329 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
332 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
333 wake_up(&mddev
->sb_wait
);
338 /* mddev_suspend makes sure no new requests are submitted
339 * to the device, and that any requests that have been submitted
340 * are completely handled.
341 * Once ->stop is called and completes, the module will be completely
344 void mddev_suspend(mddev_t
*mddev
)
346 BUG_ON(mddev
->suspended
);
347 mddev
->suspended
= 1;
349 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
350 mddev
->pers
->quiesce(mddev
, 1);
352 EXPORT_SYMBOL_GPL(mddev_suspend
);
354 void mddev_resume(mddev_t
*mddev
)
356 mddev
->suspended
= 0;
357 wake_up(&mddev
->sb_wait
);
358 mddev
->pers
->quiesce(mddev
, 0);
360 md_wakeup_thread(mddev
->thread
);
361 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
363 EXPORT_SYMBOL_GPL(mddev_resume
);
365 int mddev_congested(mddev_t
*mddev
, int bits
)
367 return mddev
->suspended
;
369 EXPORT_SYMBOL(mddev_congested
);
372 * Generic flush handling for md
375 static void md_end_flush(struct bio
*bio
, int err
)
377 mdk_rdev_t
*rdev
= bio
->bi_private
;
378 mddev_t
*mddev
= rdev
->mddev
;
380 rdev_dec_pending(rdev
, mddev
);
382 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
383 /* The pre-request flush has finished */
384 queue_work(md_wq
, &mddev
->flush_work
);
389 static void md_submit_flush_data(struct work_struct
*ws
);
391 static void submit_flushes(struct work_struct
*ws
)
393 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
396 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
397 atomic_set(&mddev
->flush_pending
, 1);
399 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
400 if (rdev
->raid_disk
>= 0 &&
401 !test_bit(Faulty
, &rdev
->flags
)) {
402 /* Take two references, one is dropped
403 * when request finishes, one after
404 * we reclaim rcu_read_lock
407 atomic_inc(&rdev
->nr_pending
);
408 atomic_inc(&rdev
->nr_pending
);
410 bi
= bio_alloc_mddev(GFP_KERNEL
, 0, mddev
);
411 bi
->bi_end_io
= md_end_flush
;
412 bi
->bi_private
= rdev
;
413 bi
->bi_bdev
= rdev
->bdev
;
414 atomic_inc(&mddev
->flush_pending
);
415 submit_bio(WRITE_FLUSH
, bi
);
417 rdev_dec_pending(rdev
, mddev
);
420 if (atomic_dec_and_test(&mddev
->flush_pending
))
421 queue_work(md_wq
, &mddev
->flush_work
);
424 static void md_submit_flush_data(struct work_struct
*ws
)
426 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
427 struct bio
*bio
= mddev
->flush_bio
;
429 if (bio
->bi_size
== 0)
430 /* an empty barrier - all done */
433 bio
->bi_rw
&= ~REQ_FLUSH
;
434 if (mddev
->pers
->make_request(mddev
, bio
))
435 generic_make_request(bio
);
438 mddev
->flush_bio
= NULL
;
439 wake_up(&mddev
->sb_wait
);
442 void md_flush_request(mddev_t
*mddev
, struct bio
*bio
)
444 spin_lock_irq(&mddev
->write_lock
);
445 wait_event_lock_irq(mddev
->sb_wait
,
447 mddev
->write_lock
, /*nothing*/);
448 mddev
->flush_bio
= bio
;
449 spin_unlock_irq(&mddev
->write_lock
);
451 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
452 queue_work(md_wq
, &mddev
->flush_work
);
454 EXPORT_SYMBOL(md_flush_request
);
456 /* Support for plugging.
457 * This mirrors the plugging support in request_queue, but does not
458 * require having a whole queue or request structures.
459 * We allocate an md_plug_cb for each md device and each thread it gets
460 * plugged on. This links tot the private plug_handle structure in the
461 * personality data where we keep a count of the number of outstanding
462 * plugs so other code can see if a plug is active.
465 struct blk_plug_cb cb
;
469 static void plugger_unplug(struct blk_plug_cb
*cb
)
471 struct md_plug_cb
*mdcb
= container_of(cb
, struct md_plug_cb
, cb
);
472 if (atomic_dec_and_test(&mdcb
->mddev
->plug_cnt
))
473 md_wakeup_thread(mdcb
->mddev
->thread
);
477 /* Check that an unplug wakeup will come shortly.
478 * If not, wakeup the md thread immediately
480 int mddev_check_plugged(mddev_t
*mddev
)
482 struct blk_plug
*plug
= current
->plug
;
483 struct md_plug_cb
*mdcb
;
488 list_for_each_entry(mdcb
, &plug
->cb_list
, cb
.list
) {
489 if (mdcb
->cb
.callback
== plugger_unplug
&&
490 mdcb
->mddev
== mddev
) {
491 /* Already on the list, move to top */
492 if (mdcb
!= list_first_entry(&plug
->cb_list
,
495 list_move(&mdcb
->cb
.list
, &plug
->cb_list
);
499 /* Not currently on the callback list */
500 mdcb
= kmalloc(sizeof(*mdcb
), GFP_ATOMIC
);
505 mdcb
->cb
.callback
= plugger_unplug
;
506 atomic_inc(&mddev
->plug_cnt
);
507 list_add(&mdcb
->cb
.list
, &plug
->cb_list
);
510 EXPORT_SYMBOL_GPL(mddev_check_plugged
);
512 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
514 atomic_inc(&mddev
->active
);
518 static void mddev_delayed_delete(struct work_struct
*ws
);
520 static void mddev_put(mddev_t
*mddev
)
522 struct bio_set
*bs
= NULL
;
524 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
526 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
527 mddev
->ctime
== 0 && !mddev
->hold_active
) {
528 /* Array is not configured at all, and not held active,
530 list_del(&mddev
->all_mddevs
);
532 mddev
->bio_set
= NULL
;
533 if (mddev
->gendisk
) {
534 /* We did a probe so need to clean up. Call
535 * queue_work inside the spinlock so that
536 * flush_workqueue() after mddev_find will
537 * succeed in waiting for the work to be done.
539 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
540 queue_work(md_misc_wq
, &mddev
->del_work
);
544 spin_unlock(&all_mddevs_lock
);
549 void mddev_init(mddev_t
*mddev
)
551 mutex_init(&mddev
->open_mutex
);
552 mutex_init(&mddev
->reconfig_mutex
);
553 mutex_init(&mddev
->bitmap_info
.mutex
);
554 INIT_LIST_HEAD(&mddev
->disks
);
555 INIT_LIST_HEAD(&mddev
->all_mddevs
);
556 init_timer(&mddev
->safemode_timer
);
557 atomic_set(&mddev
->active
, 1);
558 atomic_set(&mddev
->openers
, 0);
559 atomic_set(&mddev
->active_io
, 0);
560 atomic_set(&mddev
->plug_cnt
, 0);
561 spin_lock_init(&mddev
->write_lock
);
562 atomic_set(&mddev
->flush_pending
, 0);
563 init_waitqueue_head(&mddev
->sb_wait
);
564 init_waitqueue_head(&mddev
->recovery_wait
);
565 mddev
->reshape_position
= MaxSector
;
566 mddev
->resync_min
= 0;
567 mddev
->resync_max
= MaxSector
;
568 mddev
->level
= LEVEL_NONE
;
570 EXPORT_SYMBOL_GPL(mddev_init
);
572 static mddev_t
* mddev_find(dev_t unit
)
574 mddev_t
*mddev
, *new = NULL
;
576 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
577 unit
&= ~((1<<MdpMinorShift
)-1);
580 spin_lock(&all_mddevs_lock
);
583 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
584 if (mddev
->unit
== unit
) {
586 spin_unlock(&all_mddevs_lock
);
592 list_add(&new->all_mddevs
, &all_mddevs
);
593 spin_unlock(&all_mddevs_lock
);
594 new->hold_active
= UNTIL_IOCTL
;
598 /* find an unused unit number */
599 static int next_minor
= 512;
600 int start
= next_minor
;
604 dev
= MKDEV(MD_MAJOR
, next_minor
);
606 if (next_minor
> MINORMASK
)
608 if (next_minor
== start
) {
609 /* Oh dear, all in use. */
610 spin_unlock(&all_mddevs_lock
);
616 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
617 if (mddev
->unit
== dev
) {
623 new->md_minor
= MINOR(dev
);
624 new->hold_active
= UNTIL_STOP
;
625 list_add(&new->all_mddevs
, &all_mddevs
);
626 spin_unlock(&all_mddevs_lock
);
629 spin_unlock(&all_mddevs_lock
);
631 new = kzalloc(sizeof(*new), GFP_KERNEL
);
636 if (MAJOR(unit
) == MD_MAJOR
)
637 new->md_minor
= MINOR(unit
);
639 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
646 static inline int mddev_lock(mddev_t
* mddev
)
648 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
651 static inline int mddev_is_locked(mddev_t
*mddev
)
653 return mutex_is_locked(&mddev
->reconfig_mutex
);
656 static inline int mddev_trylock(mddev_t
* mddev
)
658 return mutex_trylock(&mddev
->reconfig_mutex
);
661 static struct attribute_group md_redundancy_group
;
663 static void mddev_unlock(mddev_t
* mddev
)
665 if (mddev
->to_remove
) {
666 /* These cannot be removed under reconfig_mutex as
667 * an access to the files will try to take reconfig_mutex
668 * while holding the file unremovable, which leads to
670 * So hold set sysfs_active while the remove in happeing,
671 * and anything else which might set ->to_remove or my
672 * otherwise change the sysfs namespace will fail with
673 * -EBUSY if sysfs_active is still set.
674 * We set sysfs_active under reconfig_mutex and elsewhere
675 * test it under the same mutex to ensure its correct value
678 struct attribute_group
*to_remove
= mddev
->to_remove
;
679 mddev
->to_remove
= NULL
;
680 mddev
->sysfs_active
= 1;
681 mutex_unlock(&mddev
->reconfig_mutex
);
683 if (mddev
->kobj
.sd
) {
684 if (to_remove
!= &md_redundancy_group
)
685 sysfs_remove_group(&mddev
->kobj
, to_remove
);
686 if (mddev
->pers
== NULL
||
687 mddev
->pers
->sync_request
== NULL
) {
688 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
689 if (mddev
->sysfs_action
)
690 sysfs_put(mddev
->sysfs_action
);
691 mddev
->sysfs_action
= NULL
;
694 mddev
->sysfs_active
= 0;
696 mutex_unlock(&mddev
->reconfig_mutex
);
698 /* was we've dropped the mutex we need a spinlock to
699 * make sur the thread doesn't disappear
701 spin_lock(&pers_lock
);
702 md_wakeup_thread(mddev
->thread
);
703 spin_unlock(&pers_lock
);
706 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
710 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
711 if (rdev
->desc_nr
== nr
)
717 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
721 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
722 if (rdev
->bdev
->bd_dev
== dev
)
728 static struct mdk_personality
*find_pers(int level
, char *clevel
)
730 struct mdk_personality
*pers
;
731 list_for_each_entry(pers
, &pers_list
, list
) {
732 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
734 if (strcmp(pers
->name
, clevel
)==0)
740 /* return the offset of the super block in 512byte sectors */
741 static inline sector_t
calc_dev_sboffset(mdk_rdev_t
*rdev
)
743 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
744 return MD_NEW_SIZE_SECTORS(num_sectors
);
747 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
752 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
753 if (!rdev
->sb_page
) {
754 printk(KERN_ALERT
"md: out of memory.\n");
761 static void free_disk_sb(mdk_rdev_t
* rdev
)
764 put_page(rdev
->sb_page
);
766 rdev
->sb_page
= NULL
;
773 static void super_written(struct bio
*bio
, int error
)
775 mdk_rdev_t
*rdev
= bio
->bi_private
;
776 mddev_t
*mddev
= rdev
->mddev
;
778 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
779 printk("md: super_written gets error=%d, uptodate=%d\n",
780 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
781 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
782 md_error(mddev
, rdev
);
785 if (atomic_dec_and_test(&mddev
->pending_writes
))
786 wake_up(&mddev
->sb_wait
);
790 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
791 sector_t sector
, int size
, struct page
*page
)
793 /* write first size bytes of page to sector of rdev
794 * Increment mddev->pending_writes before returning
795 * and decrement it on completion, waking up sb_wait
796 * if zero is reached.
797 * If an error occurred, call md_error
799 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
801 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
802 bio
->bi_sector
= sector
;
803 bio_add_page(bio
, page
, size
, 0);
804 bio
->bi_private
= rdev
;
805 bio
->bi_end_io
= super_written
;
807 atomic_inc(&mddev
->pending_writes
);
808 submit_bio(REQ_WRITE
| REQ_SYNC
| REQ_FLUSH
| REQ_FUA
, bio
);
811 void md_super_wait(mddev_t
*mddev
)
813 /* wait for all superblock writes that were scheduled to complete */
816 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
817 if (atomic_read(&mddev
->pending_writes
)==0)
821 finish_wait(&mddev
->sb_wait
, &wq
);
824 static void bi_complete(struct bio
*bio
, int error
)
826 complete((struct completion
*)bio
->bi_private
);
829 int sync_page_io(mdk_rdev_t
*rdev
, sector_t sector
, int size
,
830 struct page
*page
, int rw
, bool metadata_op
)
832 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
833 struct completion event
;
838 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
839 rdev
->meta_bdev
: rdev
->bdev
;
841 bio
->bi_sector
= sector
+ rdev
->sb_start
;
843 bio
->bi_sector
= sector
+ rdev
->data_offset
;
844 bio_add_page(bio
, page
, size
, 0);
845 init_completion(&event
);
846 bio
->bi_private
= &event
;
847 bio
->bi_end_io
= bi_complete
;
849 wait_for_completion(&event
);
851 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
855 EXPORT_SYMBOL_GPL(sync_page_io
);
857 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
859 char b
[BDEVNAME_SIZE
];
860 if (!rdev
->sb_page
) {
868 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
874 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
875 bdevname(rdev
->bdev
,b
));
879 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
881 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
882 sb1
->set_uuid1
== sb2
->set_uuid1
&&
883 sb1
->set_uuid2
== sb2
->set_uuid2
&&
884 sb1
->set_uuid3
== sb2
->set_uuid3
;
887 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
890 mdp_super_t
*tmp1
, *tmp2
;
892 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
893 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
895 if (!tmp1
|| !tmp2
) {
897 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
905 * nr_disks is not constant
910 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
918 static u32
md_csum_fold(u32 csum
)
920 csum
= (csum
& 0xffff) + (csum
>> 16);
921 return (csum
& 0xffff) + (csum
>> 16);
924 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
927 u32
*sb32
= (u32
*)sb
;
929 unsigned int disk_csum
, csum
;
931 disk_csum
= sb
->sb_csum
;
934 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
936 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
940 /* This used to use csum_partial, which was wrong for several
941 * reasons including that different results are returned on
942 * different architectures. It isn't critical that we get exactly
943 * the same return value as before (we always csum_fold before
944 * testing, and that removes any differences). However as we
945 * know that csum_partial always returned a 16bit value on
946 * alphas, do a fold to maximise conformity to previous behaviour.
948 sb
->sb_csum
= md_csum_fold(disk_csum
);
950 sb
->sb_csum
= disk_csum
;
957 * Handle superblock details.
958 * We want to be able to handle multiple superblock formats
959 * so we have a common interface to them all, and an array of
960 * different handlers.
961 * We rely on user-space to write the initial superblock, and support
962 * reading and updating of superblocks.
963 * Interface methods are:
964 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
965 * loads and validates a superblock on dev.
966 * if refdev != NULL, compare superblocks on both devices
968 * 0 - dev has a superblock that is compatible with refdev
969 * 1 - dev has a superblock that is compatible and newer than refdev
970 * so dev should be used as the refdev in future
971 * -EINVAL superblock incompatible or invalid
972 * -othererror e.g. -EIO
974 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
975 * Verify that dev is acceptable into mddev.
976 * The first time, mddev->raid_disks will be 0, and data from
977 * dev should be merged in. Subsequent calls check that dev
978 * is new enough. Return 0 or -EINVAL
980 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
981 * Update the superblock for rdev with data in mddev
982 * This does not write to disc.
988 struct module
*owner
;
989 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
991 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
992 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
993 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
994 sector_t num_sectors
);
998 * Check that the given mddev has no bitmap.
1000 * This function is called from the run method of all personalities that do not
1001 * support bitmaps. It prints an error message and returns non-zero if mddev
1002 * has a bitmap. Otherwise, it returns 0.
1005 int md_check_no_bitmap(mddev_t
*mddev
)
1007 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
1009 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1010 mdname(mddev
), mddev
->pers
->name
);
1013 EXPORT_SYMBOL(md_check_no_bitmap
);
1016 * load_super for 0.90.0
1018 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1020 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1025 * Calculate the position of the superblock (512byte sectors),
1026 * it's at the end of the disk.
1028 * It also happens to be a multiple of 4Kb.
1030 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1032 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1033 if (ret
) return ret
;
1037 bdevname(rdev
->bdev
, b
);
1038 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1040 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1041 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1046 if (sb
->major_version
!= 0 ||
1047 sb
->minor_version
< 90 ||
1048 sb
->minor_version
> 91) {
1049 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1050 sb
->major_version
, sb
->minor_version
,
1055 if (sb
->raid_disks
<= 0)
1058 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1059 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1064 rdev
->preferred_minor
= sb
->md_minor
;
1065 rdev
->data_offset
= 0;
1066 rdev
->sb_size
= MD_SB_BYTES
;
1068 if (sb
->level
== LEVEL_MULTIPATH
)
1071 rdev
->desc_nr
= sb
->this_disk
.number
;
1077 mdp_super_t
*refsb
= (mdp_super_t
*)page_address(refdev
->sb_page
);
1078 if (!uuid_equal(refsb
, sb
)) {
1079 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1080 b
, bdevname(refdev
->bdev
,b2
));
1083 if (!sb_equal(refsb
, sb
)) {
1084 printk(KERN_WARNING
"md: %s has same UUID"
1085 " but different superblock to %s\n",
1086 b
, bdevname(refdev
->bdev
, b2
));
1090 ev2
= md_event(refsb
);
1096 rdev
->sectors
= rdev
->sb_start
;
1097 /* Limit to 4TB as metadata cannot record more than that */
1098 if (rdev
->sectors
>= (2ULL << 32))
1099 rdev
->sectors
= (2ULL << 32) - 2;
1101 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1102 /* "this cannot possibly happen" ... */
1110 * validate_super for 0.90.0
1112 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1115 mdp_super_t
*sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1116 __u64 ev1
= md_event(sb
);
1118 rdev
->raid_disk
= -1;
1119 clear_bit(Faulty
, &rdev
->flags
);
1120 clear_bit(In_sync
, &rdev
->flags
);
1121 clear_bit(WriteMostly
, &rdev
->flags
);
1123 if (mddev
->raid_disks
== 0) {
1124 mddev
->major_version
= 0;
1125 mddev
->minor_version
= sb
->minor_version
;
1126 mddev
->patch_version
= sb
->patch_version
;
1127 mddev
->external
= 0;
1128 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1129 mddev
->ctime
= sb
->ctime
;
1130 mddev
->utime
= sb
->utime
;
1131 mddev
->level
= sb
->level
;
1132 mddev
->clevel
[0] = 0;
1133 mddev
->layout
= sb
->layout
;
1134 mddev
->raid_disks
= sb
->raid_disks
;
1135 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1136 mddev
->events
= ev1
;
1137 mddev
->bitmap_info
.offset
= 0;
1138 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1140 if (mddev
->minor_version
>= 91) {
1141 mddev
->reshape_position
= sb
->reshape_position
;
1142 mddev
->delta_disks
= sb
->delta_disks
;
1143 mddev
->new_level
= sb
->new_level
;
1144 mddev
->new_layout
= sb
->new_layout
;
1145 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1147 mddev
->reshape_position
= MaxSector
;
1148 mddev
->delta_disks
= 0;
1149 mddev
->new_level
= mddev
->level
;
1150 mddev
->new_layout
= mddev
->layout
;
1151 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1154 if (sb
->state
& (1<<MD_SB_CLEAN
))
1155 mddev
->recovery_cp
= MaxSector
;
1157 if (sb
->events_hi
== sb
->cp_events_hi
&&
1158 sb
->events_lo
== sb
->cp_events_lo
) {
1159 mddev
->recovery_cp
= sb
->recovery_cp
;
1161 mddev
->recovery_cp
= 0;
1164 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1165 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1166 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1167 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1169 mddev
->max_disks
= MD_SB_DISKS
;
1171 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1172 mddev
->bitmap_info
.file
== NULL
)
1173 mddev
->bitmap_info
.offset
=
1174 mddev
->bitmap_info
.default_offset
;
1176 } else if (mddev
->pers
== NULL
) {
1177 /* Insist on good event counter while assembling, except
1178 * for spares (which don't need an event count) */
1180 if (sb
->disks
[rdev
->desc_nr
].state
& (
1181 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1182 if (ev1
< mddev
->events
)
1184 } else if (mddev
->bitmap
) {
1185 /* if adding to array with a bitmap, then we can accept an
1186 * older device ... but not too old.
1188 if (ev1
< mddev
->bitmap
->events_cleared
)
1191 if (ev1
< mddev
->events
)
1192 /* just a hot-add of a new device, leave raid_disk at -1 */
1196 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1197 desc
= sb
->disks
+ rdev
->desc_nr
;
1199 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1200 set_bit(Faulty
, &rdev
->flags
);
1201 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1202 desc->raid_disk < mddev->raid_disks */) {
1203 set_bit(In_sync
, &rdev
->flags
);
1204 rdev
->raid_disk
= desc
->raid_disk
;
1205 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1206 /* active but not in sync implies recovery up to
1207 * reshape position. We don't know exactly where
1208 * that is, so set to zero for now */
1209 if (mddev
->minor_version
>= 91) {
1210 rdev
->recovery_offset
= 0;
1211 rdev
->raid_disk
= desc
->raid_disk
;
1214 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1215 set_bit(WriteMostly
, &rdev
->flags
);
1216 } else /* MULTIPATH are always insync */
1217 set_bit(In_sync
, &rdev
->flags
);
1222 * sync_super for 0.90.0
1224 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1228 int next_spare
= mddev
->raid_disks
;
1231 /* make rdev->sb match mddev data..
1234 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1235 * 3/ any empty disks < next_spare become removed
1237 * disks[0] gets initialised to REMOVED because
1238 * we cannot be sure from other fields if it has
1239 * been initialised or not.
1242 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1244 rdev
->sb_size
= MD_SB_BYTES
;
1246 sb
= (mdp_super_t
*)page_address(rdev
->sb_page
);
1248 memset(sb
, 0, sizeof(*sb
));
1250 sb
->md_magic
= MD_SB_MAGIC
;
1251 sb
->major_version
= mddev
->major_version
;
1252 sb
->patch_version
= mddev
->patch_version
;
1253 sb
->gvalid_words
= 0; /* ignored */
1254 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1255 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1256 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1257 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1259 sb
->ctime
= mddev
->ctime
;
1260 sb
->level
= mddev
->level
;
1261 sb
->size
= mddev
->dev_sectors
/ 2;
1262 sb
->raid_disks
= mddev
->raid_disks
;
1263 sb
->md_minor
= mddev
->md_minor
;
1264 sb
->not_persistent
= 0;
1265 sb
->utime
= mddev
->utime
;
1267 sb
->events_hi
= (mddev
->events
>>32);
1268 sb
->events_lo
= (u32
)mddev
->events
;
1270 if (mddev
->reshape_position
== MaxSector
)
1271 sb
->minor_version
= 90;
1273 sb
->minor_version
= 91;
1274 sb
->reshape_position
= mddev
->reshape_position
;
1275 sb
->new_level
= mddev
->new_level
;
1276 sb
->delta_disks
= mddev
->delta_disks
;
1277 sb
->new_layout
= mddev
->new_layout
;
1278 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1280 mddev
->minor_version
= sb
->minor_version
;
1283 sb
->recovery_cp
= mddev
->recovery_cp
;
1284 sb
->cp_events_hi
= (mddev
->events
>>32);
1285 sb
->cp_events_lo
= (u32
)mddev
->events
;
1286 if (mddev
->recovery_cp
== MaxSector
)
1287 sb
->state
= (1<< MD_SB_CLEAN
);
1289 sb
->recovery_cp
= 0;
1291 sb
->layout
= mddev
->layout
;
1292 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1294 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1295 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1297 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1298 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1301 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1303 if (rdev2
->raid_disk
>= 0 &&
1304 sb
->minor_version
>= 91)
1305 /* we have nowhere to store the recovery_offset,
1306 * but if it is not below the reshape_position,
1307 * we can piggy-back on that.
1310 if (rdev2
->raid_disk
< 0 ||
1311 test_bit(Faulty
, &rdev2
->flags
))
1314 desc_nr
= rdev2
->raid_disk
;
1316 desc_nr
= next_spare
++;
1317 rdev2
->desc_nr
= desc_nr
;
1318 d
= &sb
->disks
[rdev2
->desc_nr
];
1320 d
->number
= rdev2
->desc_nr
;
1321 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1322 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1324 d
->raid_disk
= rdev2
->raid_disk
;
1326 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1327 if (test_bit(Faulty
, &rdev2
->flags
))
1328 d
->state
= (1<<MD_DISK_FAULTY
);
1329 else if (is_active
) {
1330 d
->state
= (1<<MD_DISK_ACTIVE
);
1331 if (test_bit(In_sync
, &rdev2
->flags
))
1332 d
->state
|= (1<<MD_DISK_SYNC
);
1340 if (test_bit(WriteMostly
, &rdev2
->flags
))
1341 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1343 /* now set the "removed" and "faulty" bits on any missing devices */
1344 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1345 mdp_disk_t
*d
= &sb
->disks
[i
];
1346 if (d
->state
== 0 && d
->number
== 0) {
1349 d
->state
= (1<<MD_DISK_REMOVED
);
1350 d
->state
|= (1<<MD_DISK_FAULTY
);
1354 sb
->nr_disks
= nr_disks
;
1355 sb
->active_disks
= active
;
1356 sb
->working_disks
= working
;
1357 sb
->failed_disks
= failed
;
1358 sb
->spare_disks
= spare
;
1360 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1361 sb
->sb_csum
= calc_sb_csum(sb
);
1365 * rdev_size_change for 0.90.0
1367 static unsigned long long
1368 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1370 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1371 return 0; /* component must fit device */
1372 if (rdev
->mddev
->bitmap_info
.offset
)
1373 return 0; /* can't move bitmap */
1374 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1375 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1376 num_sectors
= rdev
->sb_start
;
1377 /* Limit to 4TB as metadata cannot record more than that.
1378 * 4TB == 2^32 KB, or 2*2^32 sectors.
1380 if (num_sectors
>= (2ULL << 32))
1381 num_sectors
= (2ULL << 32) - 2;
1382 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1384 md_super_wait(rdev
->mddev
);
1390 * version 1 superblock
1393 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1397 unsigned long long newcsum
;
1398 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1399 __le32
*isuper
= (__le32
*)sb
;
1402 disk_csum
= sb
->sb_csum
;
1405 for (i
=0; size
>=4; size
-= 4 )
1406 newcsum
+= le32_to_cpu(*isuper
++);
1409 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1411 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1412 sb
->sb_csum
= disk_csum
;
1413 return cpu_to_le32(csum
);
1416 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1418 struct mdp_superblock_1
*sb
;
1421 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1425 * Calculate the position of the superblock in 512byte sectors.
1426 * It is always aligned to a 4K boundary and
1427 * depeding on minor_version, it can be:
1428 * 0: At least 8K, but less than 12K, from end of device
1429 * 1: At start of device
1430 * 2: 4K from start of device.
1432 switch(minor_version
) {
1434 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1436 sb_start
&= ~(sector_t
)(4*2-1);
1447 rdev
->sb_start
= sb_start
;
1449 /* superblock is rarely larger than 1K, but it can be larger,
1450 * and it is safe to read 4k, so we do that
1452 ret
= read_disk_sb(rdev
, 4096);
1453 if (ret
) return ret
;
1456 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1458 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1459 sb
->major_version
!= cpu_to_le32(1) ||
1460 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1461 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1462 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1465 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1466 printk("md: invalid superblock checksum on %s\n",
1467 bdevname(rdev
->bdev
,b
));
1470 if (le64_to_cpu(sb
->data_size
) < 10) {
1471 printk("md: data_size too small on %s\n",
1472 bdevname(rdev
->bdev
,b
));
1476 rdev
->preferred_minor
= 0xffff;
1477 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1478 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1480 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1481 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1482 if (rdev
->sb_size
& bmask
)
1483 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1486 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1489 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1492 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1498 struct mdp_superblock_1
*refsb
=
1499 (struct mdp_superblock_1
*)page_address(refdev
->sb_page
);
1501 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1502 sb
->level
!= refsb
->level
||
1503 sb
->layout
!= refsb
->layout
||
1504 sb
->chunksize
!= refsb
->chunksize
) {
1505 printk(KERN_WARNING
"md: %s has strangely different"
1506 " superblock to %s\n",
1507 bdevname(rdev
->bdev
,b
),
1508 bdevname(refdev
->bdev
,b2
));
1511 ev1
= le64_to_cpu(sb
->events
);
1512 ev2
= le64_to_cpu(refsb
->events
);
1520 rdev
->sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
1521 le64_to_cpu(sb
->data_offset
);
1523 rdev
->sectors
= rdev
->sb_start
;
1524 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1526 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1527 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1532 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1534 struct mdp_superblock_1
*sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1535 __u64 ev1
= le64_to_cpu(sb
->events
);
1537 rdev
->raid_disk
= -1;
1538 clear_bit(Faulty
, &rdev
->flags
);
1539 clear_bit(In_sync
, &rdev
->flags
);
1540 clear_bit(WriteMostly
, &rdev
->flags
);
1542 if (mddev
->raid_disks
== 0) {
1543 mddev
->major_version
= 1;
1544 mddev
->patch_version
= 0;
1545 mddev
->external
= 0;
1546 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1547 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1548 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1549 mddev
->level
= le32_to_cpu(sb
->level
);
1550 mddev
->clevel
[0] = 0;
1551 mddev
->layout
= le32_to_cpu(sb
->layout
);
1552 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1553 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1554 mddev
->events
= ev1
;
1555 mddev
->bitmap_info
.offset
= 0;
1556 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1558 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1559 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1561 mddev
->max_disks
= (4096-256)/2;
1563 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1564 mddev
->bitmap_info
.file
== NULL
)
1565 mddev
->bitmap_info
.offset
=
1566 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1568 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1569 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1570 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1571 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1572 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1573 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1575 mddev
->reshape_position
= MaxSector
;
1576 mddev
->delta_disks
= 0;
1577 mddev
->new_level
= mddev
->level
;
1578 mddev
->new_layout
= mddev
->layout
;
1579 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1582 } else if (mddev
->pers
== NULL
) {
1583 /* Insist of good event counter while assembling, except for
1584 * spares (which don't need an event count) */
1586 if (rdev
->desc_nr
>= 0 &&
1587 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1588 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1589 if (ev1
< mddev
->events
)
1591 } else if (mddev
->bitmap
) {
1592 /* If adding to array with a bitmap, then we can accept an
1593 * older device, but not too old.
1595 if (ev1
< mddev
->bitmap
->events_cleared
)
1598 if (ev1
< mddev
->events
)
1599 /* just a hot-add of a new device, leave raid_disk at -1 */
1602 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1604 if (rdev
->desc_nr
< 0 ||
1605 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1609 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1611 case 0xffff: /* spare */
1613 case 0xfffe: /* faulty */
1614 set_bit(Faulty
, &rdev
->flags
);
1617 if ((le32_to_cpu(sb
->feature_map
) &
1618 MD_FEATURE_RECOVERY_OFFSET
))
1619 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1621 set_bit(In_sync
, &rdev
->flags
);
1622 rdev
->raid_disk
= role
;
1625 if (sb
->devflags
& WriteMostly1
)
1626 set_bit(WriteMostly
, &rdev
->flags
);
1627 } else /* MULTIPATH are always insync */
1628 set_bit(In_sync
, &rdev
->flags
);
1633 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1635 struct mdp_superblock_1
*sb
;
1638 /* make rdev->sb match mddev and rdev data. */
1640 sb
= (struct mdp_superblock_1
*)page_address(rdev
->sb_page
);
1642 sb
->feature_map
= 0;
1644 sb
->recovery_offset
= cpu_to_le64(0);
1645 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1646 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1647 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1649 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1650 sb
->events
= cpu_to_le64(mddev
->events
);
1652 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1654 sb
->resync_offset
= cpu_to_le64(0);
1656 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1658 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1659 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1660 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1661 sb
->level
= cpu_to_le32(mddev
->level
);
1662 sb
->layout
= cpu_to_le32(mddev
->layout
);
1664 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1665 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1666 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1669 if (rdev
->raid_disk
>= 0 &&
1670 !test_bit(In_sync
, &rdev
->flags
)) {
1672 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1673 sb
->recovery_offset
=
1674 cpu_to_le64(rdev
->recovery_offset
);
1677 if (mddev
->reshape_position
!= MaxSector
) {
1678 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1679 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1680 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1681 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1682 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1683 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1687 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1688 if (rdev2
->desc_nr
+1 > max_dev
)
1689 max_dev
= rdev2
->desc_nr
+1;
1691 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1693 sb
->max_dev
= cpu_to_le32(max_dev
);
1694 rdev
->sb_size
= max_dev
* 2 + 256;
1695 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1696 if (rdev
->sb_size
& bmask
)
1697 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1699 max_dev
= le32_to_cpu(sb
->max_dev
);
1701 for (i
=0; i
<max_dev
;i
++)
1702 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1704 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1706 if (test_bit(Faulty
, &rdev2
->flags
))
1707 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1708 else if (test_bit(In_sync
, &rdev2
->flags
))
1709 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1710 else if (rdev2
->raid_disk
>= 0)
1711 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1713 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1716 sb
->sb_csum
= calc_sb_1_csum(sb
);
1719 static unsigned long long
1720 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1722 struct mdp_superblock_1
*sb
;
1723 sector_t max_sectors
;
1724 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1725 return 0; /* component must fit device */
1726 if (rdev
->sb_start
< rdev
->data_offset
) {
1727 /* minor versions 1 and 2; superblock before data */
1728 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1729 max_sectors
-= rdev
->data_offset
;
1730 if (!num_sectors
|| num_sectors
> max_sectors
)
1731 num_sectors
= max_sectors
;
1732 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1733 /* minor version 0 with bitmap we can't move */
1736 /* minor version 0; superblock after data */
1738 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1739 sb_start
&= ~(sector_t
)(4*2 - 1);
1740 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1741 if (!num_sectors
|| num_sectors
> max_sectors
)
1742 num_sectors
= max_sectors
;
1743 rdev
->sb_start
= sb_start
;
1745 sb
= (struct mdp_superblock_1
*) page_address(rdev
->sb_page
);
1746 sb
->data_size
= cpu_to_le64(num_sectors
);
1747 sb
->super_offset
= rdev
->sb_start
;
1748 sb
->sb_csum
= calc_sb_1_csum(sb
);
1749 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1751 md_super_wait(rdev
->mddev
);
1755 static struct super_type super_types
[] = {
1758 .owner
= THIS_MODULE
,
1759 .load_super
= super_90_load
,
1760 .validate_super
= super_90_validate
,
1761 .sync_super
= super_90_sync
,
1762 .rdev_size_change
= super_90_rdev_size_change
,
1766 .owner
= THIS_MODULE
,
1767 .load_super
= super_1_load
,
1768 .validate_super
= super_1_validate
,
1769 .sync_super
= super_1_sync
,
1770 .rdev_size_change
= super_1_rdev_size_change
,
1774 static void sync_super(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1776 if (mddev
->sync_super
) {
1777 mddev
->sync_super(mddev
, rdev
);
1781 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1783 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1786 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1788 mdk_rdev_t
*rdev
, *rdev2
;
1791 rdev_for_each_rcu(rdev
, mddev1
)
1792 rdev_for_each_rcu(rdev2
, mddev2
)
1793 if (rdev
->bdev
->bd_contains
==
1794 rdev2
->bdev
->bd_contains
) {
1802 static LIST_HEAD(pending_raid_disks
);
1805 * Try to register data integrity profile for an mddev
1807 * This is called when an array is started and after a disk has been kicked
1808 * from the array. It only succeeds if all working and active component devices
1809 * are integrity capable with matching profiles.
1811 int md_integrity_register(mddev_t
*mddev
)
1813 mdk_rdev_t
*rdev
, *reference
= NULL
;
1815 if (list_empty(&mddev
->disks
))
1816 return 0; /* nothing to do */
1817 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1818 return 0; /* shouldn't register, or already is */
1819 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1820 /* skip spares and non-functional disks */
1821 if (test_bit(Faulty
, &rdev
->flags
))
1823 if (rdev
->raid_disk
< 0)
1826 /* Use the first rdev as the reference */
1830 /* does this rdev's profile match the reference profile? */
1831 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1832 rdev
->bdev
->bd_disk
) < 0)
1835 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1838 * All component devices are integrity capable and have matching
1839 * profiles, register the common profile for the md device.
1841 if (blk_integrity_register(mddev
->gendisk
,
1842 bdev_get_integrity(reference
->bdev
)) != 0) {
1843 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1847 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1848 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1849 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1855 EXPORT_SYMBOL(md_integrity_register
);
1857 /* Disable data integrity if non-capable/non-matching disk is being added */
1858 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1860 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1861 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1863 if (!bi_mddev
) /* nothing to do */
1865 if (rdev
->raid_disk
< 0) /* skip spares */
1867 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1868 rdev
->bdev
->bd_disk
) >= 0)
1870 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1871 blk_integrity_unregister(mddev
->gendisk
);
1873 EXPORT_SYMBOL(md_integrity_add_rdev
);
1875 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1877 char b
[BDEVNAME_SIZE
];
1887 /* prevent duplicates */
1888 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1891 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1892 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1893 rdev
->sectors
< mddev
->dev_sectors
)) {
1895 /* Cannot change size, so fail
1896 * If mddev->level <= 0, then we don't care
1897 * about aligning sizes (e.g. linear)
1899 if (mddev
->level
> 0)
1902 mddev
->dev_sectors
= rdev
->sectors
;
1905 /* Verify rdev->desc_nr is unique.
1906 * If it is -1, assign a free number, else
1907 * check number is not in use
1909 if (rdev
->desc_nr
< 0) {
1911 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1912 while (find_rdev_nr(mddev
, choice
))
1914 rdev
->desc_nr
= choice
;
1916 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1919 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1920 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1921 mdname(mddev
), mddev
->max_disks
);
1924 bdevname(rdev
->bdev
,b
);
1925 while ( (s
=strchr(b
, '/')) != NULL
)
1928 rdev
->mddev
= mddev
;
1929 printk(KERN_INFO
"md: bind<%s>\n", b
);
1931 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1934 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1935 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1936 /* failure here is OK */;
1937 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1939 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1940 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
1942 /* May as well allow recovery to be retried once */
1943 mddev
->recovery_disabled
= 0;
1948 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1953 static void md_delayed_delete(struct work_struct
*ws
)
1955 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1956 kobject_del(&rdev
->kobj
);
1957 kobject_put(&rdev
->kobj
);
1960 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1962 char b
[BDEVNAME_SIZE
];
1967 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
1968 list_del_rcu(&rdev
->same_set
);
1969 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1971 sysfs_remove_link(&rdev
->kobj
, "block");
1972 sysfs_put(rdev
->sysfs_state
);
1973 rdev
->sysfs_state
= NULL
;
1974 /* We need to delay this, otherwise we can deadlock when
1975 * writing to 'remove' to "dev/state". We also need
1976 * to delay it due to rcu usage.
1979 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1980 kobject_get(&rdev
->kobj
);
1981 queue_work(md_misc_wq
, &rdev
->del_work
);
1985 * prevent the device from being mounted, repartitioned or
1986 * otherwise reused by a RAID array (or any other kernel
1987 * subsystem), by bd_claiming the device.
1989 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1992 struct block_device
*bdev
;
1993 char b
[BDEVNAME_SIZE
];
1995 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
1996 shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1998 printk(KERN_ERR
"md: could not open %s.\n",
1999 __bdevname(dev
, b
));
2000 return PTR_ERR(bdev
);
2006 static void unlock_rdev(mdk_rdev_t
*rdev
)
2008 struct block_device
*bdev
= rdev
->bdev
;
2012 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2015 void md_autodetect_dev(dev_t dev
);
2017 static void export_rdev(mdk_rdev_t
* rdev
)
2019 char b
[BDEVNAME_SIZE
];
2020 printk(KERN_INFO
"md: export_rdev(%s)\n",
2021 bdevname(rdev
->bdev
,b
));
2026 if (test_bit(AutoDetected
, &rdev
->flags
))
2027 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2030 kobject_put(&rdev
->kobj
);
2033 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
2035 unbind_rdev_from_array(rdev
);
2039 static void export_array(mddev_t
*mddev
)
2041 mdk_rdev_t
*rdev
, *tmp
;
2043 rdev_for_each(rdev
, tmp
, mddev
) {
2048 kick_rdev_from_array(rdev
);
2050 if (!list_empty(&mddev
->disks
))
2052 mddev
->raid_disks
= 0;
2053 mddev
->major_version
= 0;
2056 static void print_desc(mdp_disk_t
*desc
)
2058 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2059 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2062 static void print_sb_90(mdp_super_t
*sb
)
2067 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2068 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2069 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2071 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2072 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2073 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2074 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2075 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2076 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2077 sb
->failed_disks
, sb
->spare_disks
,
2078 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2081 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2084 desc
= sb
->disks
+ i
;
2085 if (desc
->number
|| desc
->major
|| desc
->minor
||
2086 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2087 printk(" D %2d: ", i
);
2091 printk(KERN_INFO
"md: THIS: ");
2092 print_desc(&sb
->this_disk
);
2095 static void print_sb_1(struct mdp_superblock_1
*sb
)
2099 uuid
= sb
->set_uuid
;
2101 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2102 "md: Name: \"%s\" CT:%llu\n",
2103 le32_to_cpu(sb
->major_version
),
2104 le32_to_cpu(sb
->feature_map
),
2107 (unsigned long long)le64_to_cpu(sb
->ctime
)
2108 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2110 uuid
= sb
->device_uuid
;
2112 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2114 "md: Dev:%08x UUID: %pU\n"
2115 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2116 "md: (MaxDev:%u) \n",
2117 le32_to_cpu(sb
->level
),
2118 (unsigned long long)le64_to_cpu(sb
->size
),
2119 le32_to_cpu(sb
->raid_disks
),
2120 le32_to_cpu(sb
->layout
),
2121 le32_to_cpu(sb
->chunksize
),
2122 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2123 (unsigned long long)le64_to_cpu(sb
->data_size
),
2124 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2125 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2126 le32_to_cpu(sb
->dev_number
),
2129 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2130 (unsigned long long)le64_to_cpu(sb
->events
),
2131 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2132 le32_to_cpu(sb
->sb_csum
),
2133 le32_to_cpu(sb
->max_dev
)
2137 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2139 char b
[BDEVNAME_SIZE
];
2140 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2141 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2142 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2144 if (rdev
->sb_loaded
) {
2145 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2146 switch (major_version
) {
2148 print_sb_90((mdp_super_t
*)page_address(rdev
->sb_page
));
2151 print_sb_1((struct mdp_superblock_1
*)page_address(rdev
->sb_page
));
2155 printk(KERN_INFO
"md: no rdev superblock!\n");
2158 static void md_print_devices(void)
2160 struct list_head
*tmp
;
2163 char b
[BDEVNAME_SIZE
];
2166 printk("md: **********************************\n");
2167 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2168 printk("md: **********************************\n");
2169 for_each_mddev(mddev
, tmp
) {
2172 bitmap_print_sb(mddev
->bitmap
);
2174 printk("%s: ", mdname(mddev
));
2175 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2176 printk("<%s>", bdevname(rdev
->bdev
,b
));
2179 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2180 print_rdev(rdev
, mddev
->major_version
);
2182 printk("md: **********************************\n");
2187 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2189 /* Update each superblock (in-memory image), but
2190 * if we are allowed to, skip spares which already
2191 * have the right event counter, or have one earlier
2192 * (which would mean they aren't being marked as dirty
2193 * with the rest of the array)
2196 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2197 if (rdev
->sb_events
== mddev
->events
||
2199 rdev
->raid_disk
< 0 &&
2200 rdev
->sb_events
+1 == mddev
->events
)) {
2201 /* Don't update this superblock */
2202 rdev
->sb_loaded
= 2;
2204 sync_super(mddev
, rdev
);
2205 rdev
->sb_loaded
= 1;
2210 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2217 /* First make sure individual recovery_offsets are correct */
2218 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2219 if (rdev
->raid_disk
>= 0 &&
2220 mddev
->delta_disks
>= 0 &&
2221 !test_bit(In_sync
, &rdev
->flags
) &&
2222 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2223 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2226 if (!mddev
->persistent
) {
2227 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2228 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2229 if (!mddev
->external
)
2230 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2231 wake_up(&mddev
->sb_wait
);
2235 spin_lock_irq(&mddev
->write_lock
);
2237 mddev
->utime
= get_seconds();
2239 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2241 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2242 /* just a clean<-> dirty transition, possibly leave spares alone,
2243 * though if events isn't the right even/odd, we will have to do
2249 if (mddev
->degraded
)
2250 /* If the array is degraded, then skipping spares is both
2251 * dangerous and fairly pointless.
2252 * Dangerous because a device that was removed from the array
2253 * might have a event_count that still looks up-to-date,
2254 * so it can be re-added without a resync.
2255 * Pointless because if there are any spares to skip,
2256 * then a recovery will happen and soon that array won't
2257 * be degraded any more and the spare can go back to sleep then.
2261 sync_req
= mddev
->in_sync
;
2263 /* If this is just a dirty<->clean transition, and the array is clean
2264 * and 'events' is odd, we can roll back to the previous clean state */
2266 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2267 && mddev
->can_decrease_events
2268 && mddev
->events
!= 1) {
2270 mddev
->can_decrease_events
= 0;
2272 /* otherwise we have to go forward and ... */
2274 mddev
->can_decrease_events
= nospares
;
2277 if (!mddev
->events
) {
2279 * oops, this 64-bit counter should never wrap.
2280 * Either we are in around ~1 trillion A.C., assuming
2281 * 1 reboot per second, or we have a bug:
2286 sync_sbs(mddev
, nospares
);
2287 spin_unlock_irq(&mddev
->write_lock
);
2290 "md: updating %s RAID superblock on device (in sync %d)\n",
2291 mdname(mddev
),mddev
->in_sync
);
2293 bitmap_update_sb(mddev
->bitmap
);
2294 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2295 char b
[BDEVNAME_SIZE
];
2296 dprintk(KERN_INFO
"md: ");
2297 if (rdev
->sb_loaded
!= 1)
2298 continue; /* no noise on spare devices */
2299 if (test_bit(Faulty
, &rdev
->flags
))
2300 dprintk("(skipping faulty ");
2302 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2303 if (!test_bit(Faulty
, &rdev
->flags
)) {
2304 md_super_write(mddev
,rdev
,
2305 rdev
->sb_start
, rdev
->sb_size
,
2307 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2308 bdevname(rdev
->bdev
,b
),
2309 (unsigned long long)rdev
->sb_start
);
2310 rdev
->sb_events
= mddev
->events
;
2314 if (mddev
->level
== LEVEL_MULTIPATH
)
2315 /* only need to write one superblock... */
2318 md_super_wait(mddev
);
2319 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2321 spin_lock_irq(&mddev
->write_lock
);
2322 if (mddev
->in_sync
!= sync_req
||
2323 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2324 /* have to write it out again */
2325 spin_unlock_irq(&mddev
->write_lock
);
2328 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2329 spin_unlock_irq(&mddev
->write_lock
);
2330 wake_up(&mddev
->sb_wait
);
2331 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2332 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2336 /* words written to sysfs files may, or may not, be \n terminated.
2337 * We want to accept with case. For this we use cmd_match.
2339 static int cmd_match(const char *cmd
, const char *str
)
2341 /* See if cmd, written into a sysfs file, matches
2342 * str. They must either be the same, or cmd can
2343 * have a trailing newline
2345 while (*cmd
&& *str
&& *cmd
== *str
) {
2356 struct rdev_sysfs_entry
{
2357 struct attribute attr
;
2358 ssize_t (*show
)(mdk_rdev_t
*, char *);
2359 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2363 state_show(mdk_rdev_t
*rdev
, char *page
)
2368 if (test_bit(Faulty
, &rdev
->flags
)) {
2369 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2372 if (test_bit(In_sync
, &rdev
->flags
)) {
2373 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2376 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2377 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2380 if (test_bit(Blocked
, &rdev
->flags
)) {
2381 len
+= sprintf(page
+len
, "%sblocked", sep
);
2384 if (!test_bit(Faulty
, &rdev
->flags
) &&
2385 !test_bit(In_sync
, &rdev
->flags
)) {
2386 len
+= sprintf(page
+len
, "%sspare", sep
);
2389 return len
+sprintf(page
+len
, "\n");
2393 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2396 * faulty - simulates and error
2397 * remove - disconnects the device
2398 * writemostly - sets write_mostly
2399 * -writemostly - clears write_mostly
2400 * blocked - sets the Blocked flag
2401 * -blocked - clears the Blocked flag
2402 * insync - sets Insync providing device isn't active
2405 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2406 md_error(rdev
->mddev
, rdev
);
2408 } else if (cmd_match(buf
, "remove")) {
2409 if (rdev
->raid_disk
>= 0)
2412 mddev_t
*mddev
= rdev
->mddev
;
2413 kick_rdev_from_array(rdev
);
2415 md_update_sb(mddev
, 1);
2416 md_new_event(mddev
);
2419 } else if (cmd_match(buf
, "writemostly")) {
2420 set_bit(WriteMostly
, &rdev
->flags
);
2422 } else if (cmd_match(buf
, "-writemostly")) {
2423 clear_bit(WriteMostly
, &rdev
->flags
);
2425 } else if (cmd_match(buf
, "blocked")) {
2426 set_bit(Blocked
, &rdev
->flags
);
2428 } else if (cmd_match(buf
, "-blocked")) {
2429 clear_bit(Blocked
, &rdev
->flags
);
2430 wake_up(&rdev
->blocked_wait
);
2431 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2432 md_wakeup_thread(rdev
->mddev
->thread
);
2435 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2436 set_bit(In_sync
, &rdev
->flags
);
2440 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2441 return err
? err
: len
;
2443 static struct rdev_sysfs_entry rdev_state
=
2444 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2447 errors_show(mdk_rdev_t
*rdev
, char *page
)
2449 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2453 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2456 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2457 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2458 atomic_set(&rdev
->corrected_errors
, n
);
2463 static struct rdev_sysfs_entry rdev_errors
=
2464 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2467 slot_show(mdk_rdev_t
*rdev
, char *page
)
2469 if (rdev
->raid_disk
< 0)
2470 return sprintf(page
, "none\n");
2472 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2476 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2481 int slot
= simple_strtoul(buf
, &e
, 10);
2482 if (strncmp(buf
, "none", 4)==0)
2484 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2486 if (rdev
->mddev
->pers
&& slot
== -1) {
2487 /* Setting 'slot' on an active array requires also
2488 * updating the 'rd%d' link, and communicating
2489 * with the personality with ->hot_*_disk.
2490 * For now we only support removing
2491 * failed/spare devices. This normally happens automatically,
2492 * but not when the metadata is externally managed.
2494 if (rdev
->raid_disk
== -1)
2496 /* personality does all needed checks */
2497 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2499 err
= rdev
->mddev
->pers
->
2500 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2503 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2504 sysfs_remove_link(&rdev
->mddev
->kobj
, nm
);
2505 rdev
->raid_disk
= -1;
2506 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2507 md_wakeup_thread(rdev
->mddev
->thread
);
2508 } else if (rdev
->mddev
->pers
) {
2510 /* Activating a spare .. or possibly reactivating
2511 * if we ever get bitmaps working here.
2514 if (rdev
->raid_disk
!= -1)
2517 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2520 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2523 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2524 if (rdev2
->raid_disk
== slot
)
2527 if (slot
>= rdev
->mddev
->raid_disks
&&
2528 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2531 rdev
->raid_disk
= slot
;
2532 if (test_bit(In_sync
, &rdev
->flags
))
2533 rdev
->saved_raid_disk
= slot
;
2535 rdev
->saved_raid_disk
= -1;
2536 err
= rdev
->mddev
->pers
->
2537 hot_add_disk(rdev
->mddev
, rdev
);
2539 rdev
->raid_disk
= -1;
2542 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2543 sprintf(nm
, "rd%d", rdev
->raid_disk
);
2544 if (sysfs_create_link(&rdev
->mddev
->kobj
, &rdev
->kobj
, nm
))
2545 /* failure here is OK */;
2546 /* don't wakeup anyone, leave that to userspace. */
2548 if (slot
>= rdev
->mddev
->raid_disks
&&
2549 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2551 rdev
->raid_disk
= slot
;
2552 /* assume it is working */
2553 clear_bit(Faulty
, &rdev
->flags
);
2554 clear_bit(WriteMostly
, &rdev
->flags
);
2555 set_bit(In_sync
, &rdev
->flags
);
2556 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2562 static struct rdev_sysfs_entry rdev_slot
=
2563 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2566 offset_show(mdk_rdev_t
*rdev
, char *page
)
2568 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2572 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2575 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2576 if (e
==buf
|| (*e
&& *e
!= '\n'))
2578 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2580 if (rdev
->sectors
&& rdev
->mddev
->external
)
2581 /* Must set offset before size, so overlap checks
2584 rdev
->data_offset
= offset
;
2588 static struct rdev_sysfs_entry rdev_offset
=
2589 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2592 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2594 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2597 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2599 /* check if two start/length pairs overlap */
2607 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2609 unsigned long long blocks
;
2612 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2615 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2616 return -EINVAL
; /* sector conversion overflow */
2619 if (new != blocks
* 2)
2620 return -EINVAL
; /* unsigned long long to sector_t overflow */
2627 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2629 mddev_t
*my_mddev
= rdev
->mddev
;
2630 sector_t oldsectors
= rdev
->sectors
;
2633 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2635 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2636 if (my_mddev
->persistent
) {
2637 sectors
= super_types
[my_mddev
->major_version
].
2638 rdev_size_change(rdev
, sectors
);
2641 } else if (!sectors
)
2642 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2645 if (sectors
< my_mddev
->dev_sectors
)
2646 return -EINVAL
; /* component must fit device */
2648 rdev
->sectors
= sectors
;
2649 if (sectors
> oldsectors
&& my_mddev
->external
) {
2650 /* need to check that all other rdevs with the same ->bdev
2651 * do not overlap. We need to unlock the mddev to avoid
2652 * a deadlock. We have already changed rdev->sectors, and if
2653 * we have to change it back, we will have the lock again.
2657 struct list_head
*tmp
;
2659 mddev_unlock(my_mddev
);
2660 for_each_mddev(mddev
, tmp
) {
2664 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2665 if (rdev
->bdev
== rdev2
->bdev
&&
2667 overlaps(rdev
->data_offset
, rdev
->sectors
,
2673 mddev_unlock(mddev
);
2679 mddev_lock(my_mddev
);
2681 /* Someone else could have slipped in a size
2682 * change here, but doing so is just silly.
2683 * We put oldsectors back because we *know* it is
2684 * safe, and trust userspace not to race with
2687 rdev
->sectors
= oldsectors
;
2694 static struct rdev_sysfs_entry rdev_size
=
2695 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2698 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2700 unsigned long long recovery_start
= rdev
->recovery_offset
;
2702 if (test_bit(In_sync
, &rdev
->flags
) ||
2703 recovery_start
== MaxSector
)
2704 return sprintf(page
, "none\n");
2706 return sprintf(page
, "%llu\n", recovery_start
);
2709 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2711 unsigned long long recovery_start
;
2713 if (cmd_match(buf
, "none"))
2714 recovery_start
= MaxSector
;
2715 else if (strict_strtoull(buf
, 10, &recovery_start
))
2718 if (rdev
->mddev
->pers
&&
2719 rdev
->raid_disk
>= 0)
2722 rdev
->recovery_offset
= recovery_start
;
2723 if (recovery_start
== MaxSector
)
2724 set_bit(In_sync
, &rdev
->flags
);
2726 clear_bit(In_sync
, &rdev
->flags
);
2730 static struct rdev_sysfs_entry rdev_recovery_start
=
2731 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2733 static struct attribute
*rdev_default_attrs
[] = {
2739 &rdev_recovery_start
.attr
,
2743 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2745 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2746 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2747 mddev_t
*mddev
= rdev
->mddev
;
2753 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2755 if (rdev
->mddev
== NULL
)
2758 rv
= entry
->show(rdev
, page
);
2759 mddev_unlock(mddev
);
2765 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2766 const char *page
, size_t length
)
2768 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2769 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2771 mddev_t
*mddev
= rdev
->mddev
;
2775 if (!capable(CAP_SYS_ADMIN
))
2777 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2779 if (rdev
->mddev
== NULL
)
2782 rv
= entry
->store(rdev
, page
, length
);
2783 mddev_unlock(mddev
);
2788 static void rdev_free(struct kobject
*ko
)
2790 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2793 static const struct sysfs_ops rdev_sysfs_ops
= {
2794 .show
= rdev_attr_show
,
2795 .store
= rdev_attr_store
,
2797 static struct kobj_type rdev_ktype
= {
2798 .release
= rdev_free
,
2799 .sysfs_ops
= &rdev_sysfs_ops
,
2800 .default_attrs
= rdev_default_attrs
,
2803 void md_rdev_init(mdk_rdev_t
*rdev
)
2806 rdev
->saved_raid_disk
= -1;
2807 rdev
->raid_disk
= -1;
2809 rdev
->data_offset
= 0;
2810 rdev
->sb_events
= 0;
2811 rdev
->last_read_error
.tv_sec
= 0;
2812 rdev
->last_read_error
.tv_nsec
= 0;
2813 atomic_set(&rdev
->nr_pending
, 0);
2814 atomic_set(&rdev
->read_errors
, 0);
2815 atomic_set(&rdev
->corrected_errors
, 0);
2817 INIT_LIST_HEAD(&rdev
->same_set
);
2818 init_waitqueue_head(&rdev
->blocked_wait
);
2820 EXPORT_SYMBOL_GPL(md_rdev_init
);
2822 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2824 * mark the device faulty if:
2826 * - the device is nonexistent (zero size)
2827 * - the device has no valid superblock
2829 * a faulty rdev _never_ has rdev->sb set.
2831 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2833 char b
[BDEVNAME_SIZE
];
2838 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2840 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2841 return ERR_PTR(-ENOMEM
);
2845 if ((err
= alloc_disk_sb(rdev
)))
2848 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2852 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2854 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
2857 "md: %s has zero or unknown size, marking faulty!\n",
2858 bdevname(rdev
->bdev
,b
));
2863 if (super_format
>= 0) {
2864 err
= super_types
[super_format
].
2865 load_super(rdev
, NULL
, super_minor
);
2866 if (err
== -EINVAL
) {
2868 "md: %s does not have a valid v%d.%d "
2869 "superblock, not importing!\n",
2870 bdevname(rdev
->bdev
,b
),
2871 super_format
, super_minor
);
2876 "md: could not read %s's sb, not importing!\n",
2877 bdevname(rdev
->bdev
,b
));
2885 if (rdev
->sb_page
) {
2891 return ERR_PTR(err
);
2895 * Check a full RAID array for plausibility
2899 static void analyze_sbs(mddev_t
* mddev
)
2902 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2903 char b
[BDEVNAME_SIZE
];
2906 rdev_for_each(rdev
, tmp
, mddev
)
2907 switch (super_types
[mddev
->major_version
].
2908 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2916 "md: fatal superblock inconsistency in %s"
2917 " -- removing from array\n",
2918 bdevname(rdev
->bdev
,b
));
2919 kick_rdev_from_array(rdev
);
2923 super_types
[mddev
->major_version
].
2924 validate_super(mddev
, freshest
);
2927 rdev_for_each(rdev
, tmp
, mddev
) {
2928 if (mddev
->max_disks
&&
2929 (rdev
->desc_nr
>= mddev
->max_disks
||
2930 i
> mddev
->max_disks
)) {
2932 "md: %s: %s: only %d devices permitted\n",
2933 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2935 kick_rdev_from_array(rdev
);
2938 if (rdev
!= freshest
)
2939 if (super_types
[mddev
->major_version
].
2940 validate_super(mddev
, rdev
)) {
2941 printk(KERN_WARNING
"md: kicking non-fresh %s"
2943 bdevname(rdev
->bdev
,b
));
2944 kick_rdev_from_array(rdev
);
2947 if (mddev
->level
== LEVEL_MULTIPATH
) {
2948 rdev
->desc_nr
= i
++;
2949 rdev
->raid_disk
= rdev
->desc_nr
;
2950 set_bit(In_sync
, &rdev
->flags
);
2951 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2952 rdev
->raid_disk
= -1;
2953 clear_bit(In_sync
, &rdev
->flags
);
2958 /* Read a fixed-point number.
2959 * Numbers in sysfs attributes should be in "standard" units where
2960 * possible, so time should be in seconds.
2961 * However we internally use a a much smaller unit such as
2962 * milliseconds or jiffies.
2963 * This function takes a decimal number with a possible fractional
2964 * component, and produces an integer which is the result of
2965 * multiplying that number by 10^'scale'.
2966 * all without any floating-point arithmetic.
2968 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2970 unsigned long result
= 0;
2972 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2975 else if (decimals
< scale
) {
2978 result
= result
* 10 + value
;
2990 while (decimals
< scale
) {
2999 static void md_safemode_timeout(unsigned long data
);
3002 safe_delay_show(mddev_t
*mddev
, char *page
)
3004 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3005 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3008 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
3012 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3015 mddev
->safemode_delay
= 0;
3017 unsigned long old_delay
= mddev
->safemode_delay
;
3018 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3019 if (mddev
->safemode_delay
== 0)
3020 mddev
->safemode_delay
= 1;
3021 if (mddev
->safemode_delay
< old_delay
)
3022 md_safemode_timeout((unsigned long)mddev
);
3026 static struct md_sysfs_entry md_safe_delay
=
3027 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3030 level_show(mddev_t
*mddev
, char *page
)
3032 struct mdk_personality
*p
= mddev
->pers
;
3034 return sprintf(page
, "%s\n", p
->name
);
3035 else if (mddev
->clevel
[0])
3036 return sprintf(page
, "%s\n", mddev
->clevel
);
3037 else if (mddev
->level
!= LEVEL_NONE
)
3038 return sprintf(page
, "%d\n", mddev
->level
);
3044 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3048 struct mdk_personality
*pers
;
3053 if (mddev
->pers
== NULL
) {
3056 if (len
>= sizeof(mddev
->clevel
))
3058 strncpy(mddev
->clevel
, buf
, len
);
3059 if (mddev
->clevel
[len
-1] == '\n')
3061 mddev
->clevel
[len
] = 0;
3062 mddev
->level
= LEVEL_NONE
;
3066 /* request to change the personality. Need to ensure:
3067 * - array is not engaged in resync/recovery/reshape
3068 * - old personality can be suspended
3069 * - new personality will access other array.
3072 if (mddev
->sync_thread
||
3073 mddev
->reshape_position
!= MaxSector
||
3074 mddev
->sysfs_active
)
3077 if (!mddev
->pers
->quiesce
) {
3078 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3079 mdname(mddev
), mddev
->pers
->name
);
3083 /* Now find the new personality */
3084 if (len
== 0 || len
>= sizeof(clevel
))
3086 strncpy(clevel
, buf
, len
);
3087 if (clevel
[len
-1] == '\n')
3090 if (strict_strtol(clevel
, 10, &level
))
3093 if (request_module("md-%s", clevel
) != 0)
3094 request_module("md-level-%s", clevel
);
3095 spin_lock(&pers_lock
);
3096 pers
= find_pers(level
, clevel
);
3097 if (!pers
|| !try_module_get(pers
->owner
)) {
3098 spin_unlock(&pers_lock
);
3099 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3102 spin_unlock(&pers_lock
);
3104 if (pers
== mddev
->pers
) {
3105 /* Nothing to do! */
3106 module_put(pers
->owner
);
3109 if (!pers
->takeover
) {
3110 module_put(pers
->owner
);
3111 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3112 mdname(mddev
), clevel
);
3116 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3117 rdev
->new_raid_disk
= rdev
->raid_disk
;
3119 /* ->takeover must set new_* and/or delta_disks
3120 * if it succeeds, and may set them when it fails.
3122 priv
= pers
->takeover(mddev
);
3124 mddev
->new_level
= mddev
->level
;
3125 mddev
->new_layout
= mddev
->layout
;
3126 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3127 mddev
->raid_disks
-= mddev
->delta_disks
;
3128 mddev
->delta_disks
= 0;
3129 module_put(pers
->owner
);
3130 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3131 mdname(mddev
), clevel
);
3132 return PTR_ERR(priv
);
3135 /* Looks like we have a winner */
3136 mddev_suspend(mddev
);
3137 mddev
->pers
->stop(mddev
);
3139 if (mddev
->pers
->sync_request
== NULL
&&
3140 pers
->sync_request
!= NULL
) {
3141 /* need to add the md_redundancy_group */
3142 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3144 "md: cannot register extra attributes for %s\n",
3146 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3148 if (mddev
->pers
->sync_request
!= NULL
&&
3149 pers
->sync_request
== NULL
) {
3150 /* need to remove the md_redundancy_group */
3151 if (mddev
->to_remove
== NULL
)
3152 mddev
->to_remove
= &md_redundancy_group
;
3155 if (mddev
->pers
->sync_request
== NULL
&&
3157 /* We are converting from a no-redundancy array
3158 * to a redundancy array and metadata is managed
3159 * externally so we need to be sure that writes
3160 * won't block due to a need to transition
3162 * until external management is started.
3165 mddev
->safemode_delay
= 0;
3166 mddev
->safemode
= 0;
3169 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3171 if (rdev
->raid_disk
< 0)
3173 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3174 rdev
->new_raid_disk
= -1;
3175 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3177 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3178 sysfs_remove_link(&mddev
->kobj
, nm
);
3180 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3181 if (rdev
->raid_disk
< 0)
3183 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3185 rdev
->raid_disk
= rdev
->new_raid_disk
;
3186 if (rdev
->raid_disk
< 0)
3187 clear_bit(In_sync
, &rdev
->flags
);
3190 sprintf(nm
, "rd%d", rdev
->raid_disk
);
3191 if(sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
3192 printk("md: cannot register %s for %s after level change\n",
3197 module_put(mddev
->pers
->owner
);
3199 mddev
->private = priv
;
3200 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3201 mddev
->level
= mddev
->new_level
;
3202 mddev
->layout
= mddev
->new_layout
;
3203 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3204 mddev
->delta_disks
= 0;
3205 mddev
->degraded
= 0;
3206 if (mddev
->pers
->sync_request
== NULL
) {
3207 /* this is now an array without redundancy, so
3208 * it must always be in_sync
3211 del_timer_sync(&mddev
->safemode_timer
);
3214 mddev_resume(mddev
);
3215 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3216 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3217 md_wakeup_thread(mddev
->thread
);
3218 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3219 md_new_event(mddev
);
3223 static struct md_sysfs_entry md_level
=
3224 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3228 layout_show(mddev_t
*mddev
, char *page
)
3230 /* just a number, not meaningful for all levels */
3231 if (mddev
->reshape_position
!= MaxSector
&&
3232 mddev
->layout
!= mddev
->new_layout
)
3233 return sprintf(page
, "%d (%d)\n",
3234 mddev
->new_layout
, mddev
->layout
);
3235 return sprintf(page
, "%d\n", mddev
->layout
);
3239 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3242 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3244 if (!*buf
|| (*e
&& *e
!= '\n'))
3249 if (mddev
->pers
->check_reshape
== NULL
)
3251 mddev
->new_layout
= n
;
3252 err
= mddev
->pers
->check_reshape(mddev
);
3254 mddev
->new_layout
= mddev
->layout
;
3258 mddev
->new_layout
= n
;
3259 if (mddev
->reshape_position
== MaxSector
)
3264 static struct md_sysfs_entry md_layout
=
3265 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3269 raid_disks_show(mddev_t
*mddev
, char *page
)
3271 if (mddev
->raid_disks
== 0)
3273 if (mddev
->reshape_position
!= MaxSector
&&
3274 mddev
->delta_disks
!= 0)
3275 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3276 mddev
->raid_disks
- mddev
->delta_disks
);
3277 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3280 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3283 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3287 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3289 if (!*buf
|| (*e
&& *e
!= '\n'))
3293 rv
= update_raid_disks(mddev
, n
);
3294 else if (mddev
->reshape_position
!= MaxSector
) {
3295 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3296 mddev
->delta_disks
= n
- olddisks
;
3297 mddev
->raid_disks
= n
;
3299 mddev
->raid_disks
= n
;
3300 return rv
? rv
: len
;
3302 static struct md_sysfs_entry md_raid_disks
=
3303 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3306 chunk_size_show(mddev_t
*mddev
, char *page
)
3308 if (mddev
->reshape_position
!= MaxSector
&&
3309 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3310 return sprintf(page
, "%d (%d)\n",
3311 mddev
->new_chunk_sectors
<< 9,
3312 mddev
->chunk_sectors
<< 9);
3313 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3317 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3320 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3322 if (!*buf
|| (*e
&& *e
!= '\n'))
3327 if (mddev
->pers
->check_reshape
== NULL
)
3329 mddev
->new_chunk_sectors
= n
>> 9;
3330 err
= mddev
->pers
->check_reshape(mddev
);
3332 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3336 mddev
->new_chunk_sectors
= n
>> 9;
3337 if (mddev
->reshape_position
== MaxSector
)
3338 mddev
->chunk_sectors
= n
>> 9;
3342 static struct md_sysfs_entry md_chunk_size
=
3343 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3346 resync_start_show(mddev_t
*mddev
, char *page
)
3348 if (mddev
->recovery_cp
== MaxSector
)
3349 return sprintf(page
, "none\n");
3350 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3354 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3357 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3359 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3361 if (cmd_match(buf
, "none"))
3363 else if (!*buf
|| (*e
&& *e
!= '\n'))
3366 mddev
->recovery_cp
= n
;
3369 static struct md_sysfs_entry md_resync_start
=
3370 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3373 * The array state can be:
3376 * No devices, no size, no level
3377 * Equivalent to STOP_ARRAY ioctl
3379 * May have some settings, but array is not active
3380 * all IO results in error
3381 * When written, doesn't tear down array, but just stops it
3382 * suspended (not supported yet)
3383 * All IO requests will block. The array can be reconfigured.
3384 * Writing this, if accepted, will block until array is quiescent
3386 * no resync can happen. no superblocks get written.
3387 * write requests fail
3389 * like readonly, but behaves like 'clean' on a write request.
3391 * clean - no pending writes, but otherwise active.
3392 * When written to inactive array, starts without resync
3393 * If a write request arrives then
3394 * if metadata is known, mark 'dirty' and switch to 'active'.
3395 * if not known, block and switch to write-pending
3396 * If written to an active array that has pending writes, then fails.
3398 * fully active: IO and resync can be happening.
3399 * When written to inactive array, starts with resync
3402 * clean, but writes are blocked waiting for 'active' to be written.
3405 * like active, but no writes have been seen for a while (100msec).
3408 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3409 write_pending
, active_idle
, bad_word
};
3410 static char *array_states
[] = {
3411 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3412 "write-pending", "active-idle", NULL
};
3414 static int match_word(const char *word
, char **list
)
3417 for (n
=0; list
[n
]; n
++)
3418 if (cmd_match(word
, list
[n
]))
3424 array_state_show(mddev_t
*mddev
, char *page
)
3426 enum array_state st
= inactive
;
3439 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3441 else if (mddev
->safemode
)
3447 if (list_empty(&mddev
->disks
) &&
3448 mddev
->raid_disks
== 0 &&
3449 mddev
->dev_sectors
== 0)
3454 return sprintf(page
, "%s\n", array_states
[st
]);
3457 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3458 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3459 static int do_md_run(mddev_t
* mddev
);
3460 static int restart_array(mddev_t
*mddev
);
3463 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3466 enum array_state st
= match_word(buf
, array_states
);
3471 /* stopping an active array */
3472 if (atomic_read(&mddev
->openers
) > 0)
3474 err
= do_md_stop(mddev
, 0, 0);
3477 /* stopping an active array */
3479 if (atomic_read(&mddev
->openers
) > 0)
3481 err
= do_md_stop(mddev
, 2, 0);
3483 err
= 0; /* already inactive */
3486 break; /* not supported yet */
3489 err
= md_set_readonly(mddev
, 0);
3492 set_disk_ro(mddev
->gendisk
, 1);
3493 err
= do_md_run(mddev
);
3499 err
= md_set_readonly(mddev
, 0);
3500 else if (mddev
->ro
== 1)
3501 err
= restart_array(mddev
);
3504 set_disk_ro(mddev
->gendisk
, 0);
3508 err
= do_md_run(mddev
);
3513 restart_array(mddev
);
3514 spin_lock_irq(&mddev
->write_lock
);
3515 if (atomic_read(&mddev
->writes_pending
) == 0) {
3516 if (mddev
->in_sync
== 0) {
3518 if (mddev
->safemode
== 1)
3519 mddev
->safemode
= 0;
3520 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3525 spin_unlock_irq(&mddev
->write_lock
);
3531 restart_array(mddev
);
3532 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3533 wake_up(&mddev
->sb_wait
);
3537 set_disk_ro(mddev
->gendisk
, 0);
3538 err
= do_md_run(mddev
);
3543 /* these cannot be set */
3549 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3553 static struct md_sysfs_entry md_array_state
=
3554 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3557 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3558 return sprintf(page
, "%d\n",
3559 atomic_read(&mddev
->max_corr_read_errors
));
3563 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3566 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3568 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3569 atomic_set(&mddev
->max_corr_read_errors
, n
);
3575 static struct md_sysfs_entry max_corr_read_errors
=
3576 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3577 max_corrected_read_errors_store
);
3580 null_show(mddev_t
*mddev
, char *page
)
3586 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3588 /* buf must be %d:%d\n? giving major and minor numbers */
3589 /* The new device is added to the array.
3590 * If the array has a persistent superblock, we read the
3591 * superblock to initialise info and check validity.
3592 * Otherwise, only checking done is that in bind_rdev_to_array,
3593 * which mainly checks size.
3596 int major
= simple_strtoul(buf
, &e
, 10);
3602 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3604 minor
= simple_strtoul(e
+1, &e
, 10);
3605 if (*e
&& *e
!= '\n')
3607 dev
= MKDEV(major
, minor
);
3608 if (major
!= MAJOR(dev
) ||
3609 minor
!= MINOR(dev
))
3613 if (mddev
->persistent
) {
3614 rdev
= md_import_device(dev
, mddev
->major_version
,
3615 mddev
->minor_version
);
3616 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3617 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3618 mdk_rdev_t
, same_set
);
3619 err
= super_types
[mddev
->major_version
]
3620 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3624 } else if (mddev
->external
)
3625 rdev
= md_import_device(dev
, -2, -1);
3627 rdev
= md_import_device(dev
, -1, -1);
3630 return PTR_ERR(rdev
);
3631 err
= bind_rdev_to_array(rdev
, mddev
);
3635 return err
? err
: len
;
3638 static struct md_sysfs_entry md_new_device
=
3639 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3642 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3645 unsigned long chunk
, end_chunk
;
3649 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3651 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3652 if (buf
== end
) break;
3653 if (*end
== '-') { /* range */
3655 end_chunk
= simple_strtoul(buf
, &end
, 0);
3656 if (buf
== end
) break;
3658 if (*end
&& !isspace(*end
)) break;
3659 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3660 buf
= skip_spaces(end
);
3662 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3667 static struct md_sysfs_entry md_bitmap
=
3668 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3671 size_show(mddev_t
*mddev
, char *page
)
3673 return sprintf(page
, "%llu\n",
3674 (unsigned long long)mddev
->dev_sectors
/ 2);
3677 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3680 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3682 /* If array is inactive, we can reduce the component size, but
3683 * not increase it (except from 0).
3684 * If array is active, we can try an on-line resize
3687 int err
= strict_blocks_to_sectors(buf
, §ors
);
3692 err
= update_size(mddev
, sectors
);
3693 md_update_sb(mddev
, 1);
3695 if (mddev
->dev_sectors
== 0 ||
3696 mddev
->dev_sectors
> sectors
)
3697 mddev
->dev_sectors
= sectors
;
3701 return err
? err
: len
;
3704 static struct md_sysfs_entry md_size
=
3705 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3710 * 'none' for arrays with no metadata (good luck...)
3711 * 'external' for arrays with externally managed metadata,
3712 * or N.M for internally known formats
3715 metadata_show(mddev_t
*mddev
, char *page
)
3717 if (mddev
->persistent
)
3718 return sprintf(page
, "%d.%d\n",
3719 mddev
->major_version
, mddev
->minor_version
);
3720 else if (mddev
->external
)
3721 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3723 return sprintf(page
, "none\n");
3727 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3731 /* Changing the details of 'external' metadata is
3732 * always permitted. Otherwise there must be
3733 * no devices attached to the array.
3735 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3737 else if (!list_empty(&mddev
->disks
))
3740 if (cmd_match(buf
, "none")) {
3741 mddev
->persistent
= 0;
3742 mddev
->external
= 0;
3743 mddev
->major_version
= 0;
3744 mddev
->minor_version
= 90;
3747 if (strncmp(buf
, "external:", 9) == 0) {
3748 size_t namelen
= len
-9;
3749 if (namelen
>= sizeof(mddev
->metadata_type
))
3750 namelen
= sizeof(mddev
->metadata_type
)-1;
3751 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3752 mddev
->metadata_type
[namelen
] = 0;
3753 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3754 mddev
->metadata_type
[--namelen
] = 0;
3755 mddev
->persistent
= 0;
3756 mddev
->external
= 1;
3757 mddev
->major_version
= 0;
3758 mddev
->minor_version
= 90;
3761 major
= simple_strtoul(buf
, &e
, 10);
3762 if (e
==buf
|| *e
!= '.')
3765 minor
= simple_strtoul(buf
, &e
, 10);
3766 if (e
==buf
|| (*e
&& *e
!= '\n') )
3768 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3770 mddev
->major_version
= major
;
3771 mddev
->minor_version
= minor
;
3772 mddev
->persistent
= 1;
3773 mddev
->external
= 0;
3777 static struct md_sysfs_entry md_metadata
=
3778 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3781 action_show(mddev_t
*mddev
, char *page
)
3783 char *type
= "idle";
3784 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3786 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3787 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3788 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3790 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3791 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3793 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3797 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3800 return sprintf(page
, "%s\n", type
);
3803 static void reap_sync_thread(mddev_t
*mddev
);
3806 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3808 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3811 if (cmd_match(page
, "frozen"))
3812 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3814 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3816 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3817 if (mddev
->sync_thread
) {
3818 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3819 reap_sync_thread(mddev
);
3821 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3822 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3824 else if (cmd_match(page
, "resync"))
3825 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3826 else if (cmd_match(page
, "recover")) {
3827 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3828 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3829 } else if (cmd_match(page
, "reshape")) {
3831 if (mddev
->pers
->start_reshape
== NULL
)
3833 err
= mddev
->pers
->start_reshape(mddev
);
3836 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3838 if (cmd_match(page
, "check"))
3839 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3840 else if (!cmd_match(page
, "repair"))
3842 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3843 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3845 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3846 md_wakeup_thread(mddev
->thread
);
3847 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3852 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3854 return sprintf(page
, "%llu\n",
3855 (unsigned long long) mddev
->resync_mismatches
);
3858 static struct md_sysfs_entry md_scan_mode
=
3859 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3862 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3865 sync_min_show(mddev_t
*mddev
, char *page
)
3867 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3868 mddev
->sync_speed_min
? "local": "system");
3872 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3876 if (strncmp(buf
, "system", 6)==0) {
3877 mddev
->sync_speed_min
= 0;
3880 min
= simple_strtoul(buf
, &e
, 10);
3881 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3883 mddev
->sync_speed_min
= min
;
3887 static struct md_sysfs_entry md_sync_min
=
3888 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3891 sync_max_show(mddev_t
*mddev
, char *page
)
3893 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3894 mddev
->sync_speed_max
? "local": "system");
3898 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3902 if (strncmp(buf
, "system", 6)==0) {
3903 mddev
->sync_speed_max
= 0;
3906 max
= simple_strtoul(buf
, &e
, 10);
3907 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3909 mddev
->sync_speed_max
= max
;
3913 static struct md_sysfs_entry md_sync_max
=
3914 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3917 degraded_show(mddev_t
*mddev
, char *page
)
3919 return sprintf(page
, "%d\n", mddev
->degraded
);
3921 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3924 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3926 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3930 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3934 if (strict_strtol(buf
, 10, &n
))
3937 if (n
!= 0 && n
!= 1)
3940 mddev
->parallel_resync
= n
;
3942 if (mddev
->sync_thread
)
3943 wake_up(&resync_wait
);
3948 /* force parallel resync, even with shared block devices */
3949 static struct md_sysfs_entry md_sync_force_parallel
=
3950 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3951 sync_force_parallel_show
, sync_force_parallel_store
);
3954 sync_speed_show(mddev_t
*mddev
, char *page
)
3956 unsigned long resync
, dt
, db
;
3957 if (mddev
->curr_resync
== 0)
3958 return sprintf(page
, "none\n");
3959 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3960 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3962 db
= resync
- mddev
->resync_mark_cnt
;
3963 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3966 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3969 sync_completed_show(mddev_t
*mddev
, char *page
)
3971 unsigned long long max_sectors
, resync
;
3973 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3974 return sprintf(page
, "none\n");
3976 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3977 max_sectors
= mddev
->resync_max_sectors
;
3979 max_sectors
= mddev
->dev_sectors
;
3981 resync
= mddev
->curr_resync_completed
;
3982 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
3985 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3988 min_sync_show(mddev_t
*mddev
, char *page
)
3990 return sprintf(page
, "%llu\n",
3991 (unsigned long long)mddev
->resync_min
);
3994 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3996 unsigned long long min
;
3997 if (strict_strtoull(buf
, 10, &min
))
3999 if (min
> mddev
->resync_max
)
4001 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4004 /* Must be a multiple of chunk_size */
4005 if (mddev
->chunk_sectors
) {
4006 sector_t temp
= min
;
4007 if (sector_div(temp
, mddev
->chunk_sectors
))
4010 mddev
->resync_min
= min
;
4015 static struct md_sysfs_entry md_min_sync
=
4016 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4019 max_sync_show(mddev_t
*mddev
, char *page
)
4021 if (mddev
->resync_max
== MaxSector
)
4022 return sprintf(page
, "max\n");
4024 return sprintf(page
, "%llu\n",
4025 (unsigned long long)mddev
->resync_max
);
4028 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4030 if (strncmp(buf
, "max", 3) == 0)
4031 mddev
->resync_max
= MaxSector
;
4033 unsigned long long max
;
4034 if (strict_strtoull(buf
, 10, &max
))
4036 if (max
< mddev
->resync_min
)
4038 if (max
< mddev
->resync_max
&&
4040 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4043 /* Must be a multiple of chunk_size */
4044 if (mddev
->chunk_sectors
) {
4045 sector_t temp
= max
;
4046 if (sector_div(temp
, mddev
->chunk_sectors
))
4049 mddev
->resync_max
= max
;
4051 wake_up(&mddev
->recovery_wait
);
4055 static struct md_sysfs_entry md_max_sync
=
4056 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4059 suspend_lo_show(mddev_t
*mddev
, char *page
)
4061 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4065 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4068 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4069 unsigned long long old
= mddev
->suspend_lo
;
4071 if (mddev
->pers
== NULL
||
4072 mddev
->pers
->quiesce
== NULL
)
4074 if (buf
== e
|| (*e
&& *e
!= '\n'))
4077 mddev
->suspend_lo
= new;
4079 /* Shrinking suspended region */
4080 mddev
->pers
->quiesce(mddev
, 2);
4082 /* Expanding suspended region - need to wait */
4083 mddev
->pers
->quiesce(mddev
, 1);
4084 mddev
->pers
->quiesce(mddev
, 0);
4088 static struct md_sysfs_entry md_suspend_lo
=
4089 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4093 suspend_hi_show(mddev_t
*mddev
, char *page
)
4095 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4099 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4102 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4103 unsigned long long old
= mddev
->suspend_hi
;
4105 if (mddev
->pers
== NULL
||
4106 mddev
->pers
->quiesce
== NULL
)
4108 if (buf
== e
|| (*e
&& *e
!= '\n'))
4111 mddev
->suspend_hi
= new;
4113 /* Shrinking suspended region */
4114 mddev
->pers
->quiesce(mddev
, 2);
4116 /* Expanding suspended region - need to wait */
4117 mddev
->pers
->quiesce(mddev
, 1);
4118 mddev
->pers
->quiesce(mddev
, 0);
4122 static struct md_sysfs_entry md_suspend_hi
=
4123 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4126 reshape_position_show(mddev_t
*mddev
, char *page
)
4128 if (mddev
->reshape_position
!= MaxSector
)
4129 return sprintf(page
, "%llu\n",
4130 (unsigned long long)mddev
->reshape_position
);
4131 strcpy(page
, "none\n");
4136 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4139 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4142 if (buf
== e
|| (*e
&& *e
!= '\n'))
4144 mddev
->reshape_position
= new;
4145 mddev
->delta_disks
= 0;
4146 mddev
->new_level
= mddev
->level
;
4147 mddev
->new_layout
= mddev
->layout
;
4148 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4152 static struct md_sysfs_entry md_reshape_position
=
4153 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4154 reshape_position_store
);
4157 array_size_show(mddev_t
*mddev
, char *page
)
4159 if (mddev
->external_size
)
4160 return sprintf(page
, "%llu\n",
4161 (unsigned long long)mddev
->array_sectors
/2);
4163 return sprintf(page
, "default\n");
4167 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4171 if (strncmp(buf
, "default", 7) == 0) {
4173 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4175 sectors
= mddev
->array_sectors
;
4177 mddev
->external_size
= 0;
4179 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4181 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4184 mddev
->external_size
= 1;
4187 mddev
->array_sectors
= sectors
;
4189 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4190 revalidate_disk(mddev
->gendisk
);
4195 static struct md_sysfs_entry md_array_size
=
4196 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4199 static struct attribute
*md_default_attrs
[] = {
4202 &md_raid_disks
.attr
,
4203 &md_chunk_size
.attr
,
4205 &md_resync_start
.attr
,
4207 &md_new_device
.attr
,
4208 &md_safe_delay
.attr
,
4209 &md_array_state
.attr
,
4210 &md_reshape_position
.attr
,
4211 &md_array_size
.attr
,
4212 &max_corr_read_errors
.attr
,
4216 static struct attribute
*md_redundancy_attrs
[] = {
4218 &md_mismatches
.attr
,
4221 &md_sync_speed
.attr
,
4222 &md_sync_force_parallel
.attr
,
4223 &md_sync_completed
.attr
,
4226 &md_suspend_lo
.attr
,
4227 &md_suspend_hi
.attr
,
4232 static struct attribute_group md_redundancy_group
= {
4234 .attrs
= md_redundancy_attrs
,
4239 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4241 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4242 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4247 rv
= mddev_lock(mddev
);
4249 rv
= entry
->show(mddev
, page
);
4250 mddev_unlock(mddev
);
4256 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4257 const char *page
, size_t length
)
4259 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4260 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4265 if (!capable(CAP_SYS_ADMIN
))
4267 rv
= mddev_lock(mddev
);
4268 if (mddev
->hold_active
== UNTIL_IOCTL
)
4269 mddev
->hold_active
= 0;
4271 rv
= entry
->store(mddev
, page
, length
);
4272 mddev_unlock(mddev
);
4277 static void md_free(struct kobject
*ko
)
4279 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4281 if (mddev
->sysfs_state
)
4282 sysfs_put(mddev
->sysfs_state
);
4284 if (mddev
->gendisk
) {
4285 del_gendisk(mddev
->gendisk
);
4286 put_disk(mddev
->gendisk
);
4289 blk_cleanup_queue(mddev
->queue
);
4294 static const struct sysfs_ops md_sysfs_ops
= {
4295 .show
= md_attr_show
,
4296 .store
= md_attr_store
,
4298 static struct kobj_type md_ktype
= {
4300 .sysfs_ops
= &md_sysfs_ops
,
4301 .default_attrs
= md_default_attrs
,
4306 static void mddev_delayed_delete(struct work_struct
*ws
)
4308 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4310 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4311 kobject_del(&mddev
->kobj
);
4312 kobject_put(&mddev
->kobj
);
4315 static int md_alloc(dev_t dev
, char *name
)
4317 static DEFINE_MUTEX(disks_mutex
);
4318 mddev_t
*mddev
= mddev_find(dev
);
4319 struct gendisk
*disk
;
4328 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4329 shift
= partitioned
? MdpMinorShift
: 0;
4330 unit
= MINOR(mddev
->unit
) >> shift
;
4332 /* wait for any previous instance of this device to be
4333 * completely removed (mddev_delayed_delete).
4335 flush_workqueue(md_misc_wq
);
4337 mutex_lock(&disks_mutex
);
4343 /* Need to ensure that 'name' is not a duplicate.
4346 spin_lock(&all_mddevs_lock
);
4348 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4349 if (mddev2
->gendisk
&&
4350 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4351 spin_unlock(&all_mddevs_lock
);
4354 spin_unlock(&all_mddevs_lock
);
4358 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4361 mddev
->queue
->queuedata
= mddev
;
4363 blk_queue_make_request(mddev
->queue
, md_make_request
);
4365 disk
= alloc_disk(1 << shift
);
4367 blk_cleanup_queue(mddev
->queue
);
4368 mddev
->queue
= NULL
;
4371 disk
->major
= MAJOR(mddev
->unit
);
4372 disk
->first_minor
= unit
<< shift
;
4374 strcpy(disk
->disk_name
, name
);
4375 else if (partitioned
)
4376 sprintf(disk
->disk_name
, "md_d%d", unit
);
4378 sprintf(disk
->disk_name
, "md%d", unit
);
4379 disk
->fops
= &md_fops
;
4380 disk
->private_data
= mddev
;
4381 disk
->queue
= mddev
->queue
;
4382 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4383 /* Allow extended partitions. This makes the
4384 * 'mdp' device redundant, but we can't really
4387 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4388 mddev
->gendisk
= disk
;
4389 /* As soon as we call add_disk(), another thread could get
4390 * through to md_open, so make sure it doesn't get too far
4392 mutex_lock(&mddev
->open_mutex
);
4395 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4396 &disk_to_dev(disk
)->kobj
, "%s", "md");
4398 /* This isn't possible, but as kobject_init_and_add is marked
4399 * __must_check, we must do something with the result
4401 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4405 if (mddev
->kobj
.sd
&&
4406 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4407 printk(KERN_DEBUG
"pointless warning\n");
4408 mutex_unlock(&mddev
->open_mutex
);
4410 mutex_unlock(&disks_mutex
);
4411 if (!error
&& mddev
->kobj
.sd
) {
4412 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4413 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4419 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4421 md_alloc(dev
, NULL
);
4425 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4427 /* val must be "md_*" where * is not all digits.
4428 * We allocate an array with a large free minor number, and
4429 * set the name to val. val must not already be an active name.
4431 int len
= strlen(val
);
4432 char buf
[DISK_NAME_LEN
];
4434 while (len
&& val
[len
-1] == '\n')
4436 if (len
>= DISK_NAME_LEN
)
4438 strlcpy(buf
, val
, len
+1);
4439 if (strncmp(buf
, "md_", 3) != 0)
4441 return md_alloc(0, buf
);
4444 static void md_safemode_timeout(unsigned long data
)
4446 mddev_t
*mddev
= (mddev_t
*) data
;
4448 if (!atomic_read(&mddev
->writes_pending
)) {
4449 mddev
->safemode
= 1;
4450 if (mddev
->external
)
4451 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4453 md_wakeup_thread(mddev
->thread
);
4456 static int start_dirty_degraded
;
4458 int md_run(mddev_t
*mddev
)
4462 struct mdk_personality
*pers
;
4464 if (list_empty(&mddev
->disks
))
4465 /* cannot run an array with no devices.. */
4470 /* Cannot run until previous stop completes properly */
4471 if (mddev
->sysfs_active
)
4475 * Analyze all RAID superblock(s)
4477 if (!mddev
->raid_disks
) {
4478 if (!mddev
->persistent
)
4483 if (mddev
->level
!= LEVEL_NONE
)
4484 request_module("md-level-%d", mddev
->level
);
4485 else if (mddev
->clevel
[0])
4486 request_module("md-%s", mddev
->clevel
);
4489 * Drop all container device buffers, from now on
4490 * the only valid external interface is through the md
4493 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4494 if (test_bit(Faulty
, &rdev
->flags
))
4496 sync_blockdev(rdev
->bdev
);
4497 invalidate_bdev(rdev
->bdev
);
4499 /* perform some consistency tests on the device.
4500 * We don't want the data to overlap the metadata,
4501 * Internal Bitmap issues have been handled elsewhere.
4503 if (rdev
->meta_bdev
) {
4504 /* Nothing to check */;
4505 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4506 if (mddev
->dev_sectors
&&
4507 rdev
->data_offset
+ mddev
->dev_sectors
4509 printk("md: %s: data overlaps metadata\n",
4514 if (rdev
->sb_start
+ rdev
->sb_size
/512
4515 > rdev
->data_offset
) {
4516 printk("md: %s: metadata overlaps data\n",
4521 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4524 if (mddev
->bio_set
== NULL
)
4525 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, sizeof(mddev
));
4527 spin_lock(&pers_lock
);
4528 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4529 if (!pers
|| !try_module_get(pers
->owner
)) {
4530 spin_unlock(&pers_lock
);
4531 if (mddev
->level
!= LEVEL_NONE
)
4532 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4535 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4540 spin_unlock(&pers_lock
);
4541 if (mddev
->level
!= pers
->level
) {
4542 mddev
->level
= pers
->level
;
4543 mddev
->new_level
= pers
->level
;
4545 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4547 if (mddev
->reshape_position
!= MaxSector
&&
4548 pers
->start_reshape
== NULL
) {
4549 /* This personality cannot handle reshaping... */
4551 module_put(pers
->owner
);
4555 if (pers
->sync_request
) {
4556 /* Warn if this is a potentially silly
4559 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4563 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4564 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4566 rdev
->bdev
->bd_contains
==
4567 rdev2
->bdev
->bd_contains
) {
4569 "%s: WARNING: %s appears to be"
4570 " on the same physical disk as"
4573 bdevname(rdev
->bdev
,b
),
4574 bdevname(rdev2
->bdev
,b2
));
4581 "True protection against single-disk"
4582 " failure might be compromised.\n");
4585 mddev
->recovery
= 0;
4586 /* may be over-ridden by personality */
4587 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4589 mddev
->ok_start_degraded
= start_dirty_degraded
;
4591 if (start_readonly
&& mddev
->ro
== 0)
4592 mddev
->ro
= 2; /* read-only, but switch on first write */
4594 err
= mddev
->pers
->run(mddev
);
4596 printk(KERN_ERR
"md: pers->run() failed ...\n");
4597 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4598 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4599 " but 'external_size' not in effect?\n", __func__
);
4601 "md: invalid array_size %llu > default size %llu\n",
4602 (unsigned long long)mddev
->array_sectors
/ 2,
4603 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4605 mddev
->pers
->stop(mddev
);
4607 if (err
== 0 && mddev
->pers
->sync_request
) {
4608 err
= bitmap_create(mddev
);
4610 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4611 mdname(mddev
), err
);
4612 mddev
->pers
->stop(mddev
);
4616 module_put(mddev
->pers
->owner
);
4618 bitmap_destroy(mddev
);
4621 if (mddev
->pers
->sync_request
) {
4622 if (mddev
->kobj
.sd
&&
4623 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4625 "md: cannot register extra attributes for %s\n",
4627 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4628 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4631 atomic_set(&mddev
->writes_pending
,0);
4632 atomic_set(&mddev
->max_corr_read_errors
,
4633 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4634 mddev
->safemode
= 0;
4635 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4636 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4637 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4641 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4642 if (rdev
->raid_disk
>= 0) {
4644 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4645 if (sysfs_create_link(&mddev
->kobj
, &rdev
->kobj
, nm
))
4646 /* failure here is OK */;
4649 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4652 md_update_sb(mddev
, 0);
4654 md_new_event(mddev
);
4655 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4656 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4657 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4660 EXPORT_SYMBOL_GPL(md_run
);
4662 static int do_md_run(mddev_t
*mddev
)
4666 err
= md_run(mddev
);
4669 err
= bitmap_load(mddev
);
4671 bitmap_destroy(mddev
);
4675 md_wakeup_thread(mddev
->thread
);
4676 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4678 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4679 revalidate_disk(mddev
->gendisk
);
4681 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4686 static int restart_array(mddev_t
*mddev
)
4688 struct gendisk
*disk
= mddev
->gendisk
;
4690 /* Complain if it has no devices */
4691 if (list_empty(&mddev
->disks
))
4697 mddev
->safemode
= 0;
4699 set_disk_ro(disk
, 0);
4700 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4702 /* Kick recovery or resync if necessary */
4703 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4704 md_wakeup_thread(mddev
->thread
);
4705 md_wakeup_thread(mddev
->sync_thread
);
4706 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4710 /* similar to deny_write_access, but accounts for our holding a reference
4711 * to the file ourselves */
4712 static int deny_bitmap_write_access(struct file
* file
)
4714 struct inode
*inode
= file
->f_mapping
->host
;
4716 spin_lock(&inode
->i_lock
);
4717 if (atomic_read(&inode
->i_writecount
) > 1) {
4718 spin_unlock(&inode
->i_lock
);
4721 atomic_set(&inode
->i_writecount
, -1);
4722 spin_unlock(&inode
->i_lock
);
4727 void restore_bitmap_write_access(struct file
*file
)
4729 struct inode
*inode
= file
->f_mapping
->host
;
4731 spin_lock(&inode
->i_lock
);
4732 atomic_set(&inode
->i_writecount
, 1);
4733 spin_unlock(&inode
->i_lock
);
4736 static void md_clean(mddev_t
*mddev
)
4738 mddev
->array_sectors
= 0;
4739 mddev
->external_size
= 0;
4740 mddev
->dev_sectors
= 0;
4741 mddev
->raid_disks
= 0;
4742 mddev
->recovery_cp
= 0;
4743 mddev
->resync_min
= 0;
4744 mddev
->resync_max
= MaxSector
;
4745 mddev
->reshape_position
= MaxSector
;
4746 mddev
->external
= 0;
4747 mddev
->persistent
= 0;
4748 mddev
->level
= LEVEL_NONE
;
4749 mddev
->clevel
[0] = 0;
4752 mddev
->metadata_type
[0] = 0;
4753 mddev
->chunk_sectors
= 0;
4754 mddev
->ctime
= mddev
->utime
= 0;
4756 mddev
->max_disks
= 0;
4758 mddev
->can_decrease_events
= 0;
4759 mddev
->delta_disks
= 0;
4760 mddev
->new_level
= LEVEL_NONE
;
4761 mddev
->new_layout
= 0;
4762 mddev
->new_chunk_sectors
= 0;
4763 mddev
->curr_resync
= 0;
4764 mddev
->resync_mismatches
= 0;
4765 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4766 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4767 mddev
->recovery
= 0;
4770 mddev
->degraded
= 0;
4771 mddev
->safemode
= 0;
4772 mddev
->bitmap_info
.offset
= 0;
4773 mddev
->bitmap_info
.default_offset
= 0;
4774 mddev
->bitmap_info
.chunksize
= 0;
4775 mddev
->bitmap_info
.daemon_sleep
= 0;
4776 mddev
->bitmap_info
.max_write_behind
= 0;
4779 static void __md_stop_writes(mddev_t
*mddev
)
4781 if (mddev
->sync_thread
) {
4782 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4783 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4784 reap_sync_thread(mddev
);
4787 del_timer_sync(&mddev
->safemode_timer
);
4789 bitmap_flush(mddev
);
4790 md_super_wait(mddev
);
4792 if (!mddev
->in_sync
|| mddev
->flags
) {
4793 /* mark array as shutdown cleanly */
4795 md_update_sb(mddev
, 1);
4799 void md_stop_writes(mddev_t
*mddev
)
4802 __md_stop_writes(mddev
);
4803 mddev_unlock(mddev
);
4805 EXPORT_SYMBOL_GPL(md_stop_writes
);
4807 void md_stop(mddev_t
*mddev
)
4810 mddev
->pers
->stop(mddev
);
4811 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4812 mddev
->to_remove
= &md_redundancy_group
;
4813 module_put(mddev
->pers
->owner
);
4815 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4817 EXPORT_SYMBOL_GPL(md_stop
);
4819 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4822 mutex_lock(&mddev
->open_mutex
);
4823 if (atomic_read(&mddev
->openers
) > is_open
) {
4824 printk("md: %s still in use.\n",mdname(mddev
));
4829 __md_stop_writes(mddev
);
4835 set_disk_ro(mddev
->gendisk
, 1);
4836 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4837 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4841 mutex_unlock(&mddev
->open_mutex
);
4846 * 0 - completely stop and dis-assemble array
4847 * 2 - stop but do not disassemble array
4849 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4851 struct gendisk
*disk
= mddev
->gendisk
;
4854 mutex_lock(&mddev
->open_mutex
);
4855 if (atomic_read(&mddev
->openers
) > is_open
||
4856 mddev
->sysfs_active
) {
4857 printk("md: %s still in use.\n",mdname(mddev
));
4858 mutex_unlock(&mddev
->open_mutex
);
4864 set_disk_ro(disk
, 0);
4866 __md_stop_writes(mddev
);
4868 mddev
->queue
->merge_bvec_fn
= NULL
;
4869 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4871 /* tell userspace to handle 'inactive' */
4872 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4874 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4875 if (rdev
->raid_disk
>= 0) {
4877 sprintf(nm
, "rd%d", rdev
->raid_disk
);
4878 sysfs_remove_link(&mddev
->kobj
, nm
);
4881 set_capacity(disk
, 0);
4882 mutex_unlock(&mddev
->open_mutex
);
4884 revalidate_disk(disk
);
4889 mutex_unlock(&mddev
->open_mutex
);
4891 * Free resources if final stop
4894 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4896 bitmap_destroy(mddev
);
4897 if (mddev
->bitmap_info
.file
) {
4898 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4899 fput(mddev
->bitmap_info
.file
);
4900 mddev
->bitmap_info
.file
= NULL
;
4902 mddev
->bitmap_info
.offset
= 0;
4904 export_array(mddev
);
4907 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4908 if (mddev
->hold_active
== UNTIL_STOP
)
4909 mddev
->hold_active
= 0;
4911 blk_integrity_unregister(disk
);
4912 md_new_event(mddev
);
4913 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4918 static void autorun_array(mddev_t
*mddev
)
4923 if (list_empty(&mddev
->disks
))
4926 printk(KERN_INFO
"md: running: ");
4928 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4929 char b
[BDEVNAME_SIZE
];
4930 printk("<%s>", bdevname(rdev
->bdev
,b
));
4934 err
= do_md_run(mddev
);
4936 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4937 do_md_stop(mddev
, 0, 0);
4942 * lets try to run arrays based on all disks that have arrived
4943 * until now. (those are in pending_raid_disks)
4945 * the method: pick the first pending disk, collect all disks with
4946 * the same UUID, remove all from the pending list and put them into
4947 * the 'same_array' list. Then order this list based on superblock
4948 * update time (freshest comes first), kick out 'old' disks and
4949 * compare superblocks. If everything's fine then run it.
4951 * If "unit" is allocated, then bump its reference count
4953 static void autorun_devices(int part
)
4955 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4957 char b
[BDEVNAME_SIZE
];
4959 printk(KERN_INFO
"md: autorun ...\n");
4960 while (!list_empty(&pending_raid_disks
)) {
4963 LIST_HEAD(candidates
);
4964 rdev0
= list_entry(pending_raid_disks
.next
,
4965 mdk_rdev_t
, same_set
);
4967 printk(KERN_INFO
"md: considering %s ...\n",
4968 bdevname(rdev0
->bdev
,b
));
4969 INIT_LIST_HEAD(&candidates
);
4970 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4971 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4972 printk(KERN_INFO
"md: adding %s ...\n",
4973 bdevname(rdev
->bdev
,b
));
4974 list_move(&rdev
->same_set
, &candidates
);
4977 * now we have a set of devices, with all of them having
4978 * mostly sane superblocks. It's time to allocate the
4982 dev
= MKDEV(mdp_major
,
4983 rdev0
->preferred_minor
<< MdpMinorShift
);
4984 unit
= MINOR(dev
) >> MdpMinorShift
;
4986 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4989 if (rdev0
->preferred_minor
!= unit
) {
4990 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4991 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4995 md_probe(dev
, NULL
, NULL
);
4996 mddev
= mddev_find(dev
);
4997 if (!mddev
|| !mddev
->gendisk
) {
5001 "md: cannot allocate memory for md drive.\n");
5004 if (mddev_lock(mddev
))
5005 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5007 else if (mddev
->raid_disks
|| mddev
->major_version
5008 || !list_empty(&mddev
->disks
)) {
5010 "md: %s already running, cannot run %s\n",
5011 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5012 mddev_unlock(mddev
);
5014 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5015 mddev
->persistent
= 1;
5016 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5017 list_del_init(&rdev
->same_set
);
5018 if (bind_rdev_to_array(rdev
, mddev
))
5021 autorun_array(mddev
);
5022 mddev_unlock(mddev
);
5024 /* on success, candidates will be empty, on error
5027 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5028 list_del_init(&rdev
->same_set
);
5033 printk(KERN_INFO
"md: ... autorun DONE.\n");
5035 #endif /* !MODULE */
5037 static int get_version(void __user
* arg
)
5041 ver
.major
= MD_MAJOR_VERSION
;
5042 ver
.minor
= MD_MINOR_VERSION
;
5043 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5045 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5051 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
5053 mdu_array_info_t info
;
5054 int nr
,working
,insync
,failed
,spare
;
5057 nr
=working
=insync
=failed
=spare
=0;
5058 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5060 if (test_bit(Faulty
, &rdev
->flags
))
5064 if (test_bit(In_sync
, &rdev
->flags
))
5071 info
.major_version
= mddev
->major_version
;
5072 info
.minor_version
= mddev
->minor_version
;
5073 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5074 info
.ctime
= mddev
->ctime
;
5075 info
.level
= mddev
->level
;
5076 info
.size
= mddev
->dev_sectors
/ 2;
5077 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5080 info
.raid_disks
= mddev
->raid_disks
;
5081 info
.md_minor
= mddev
->md_minor
;
5082 info
.not_persistent
= !mddev
->persistent
;
5084 info
.utime
= mddev
->utime
;
5087 info
.state
= (1<<MD_SB_CLEAN
);
5088 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5089 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5090 info
.active_disks
= insync
;
5091 info
.working_disks
= working
;
5092 info
.failed_disks
= failed
;
5093 info
.spare_disks
= spare
;
5095 info
.layout
= mddev
->layout
;
5096 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5098 if (copy_to_user(arg
, &info
, sizeof(info
)))
5104 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5106 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5107 char *ptr
, *buf
= NULL
;
5110 if (md_allow_write(mddev
))
5111 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5113 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5118 /* bitmap disabled, zero the first byte and copy out */
5119 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5120 file
->pathname
[0] = '\0';
5124 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5128 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5132 strcpy(file
->pathname
, ptr
);
5136 if (copy_to_user(arg
, file
, sizeof(*file
)))
5144 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5146 mdu_disk_info_t info
;
5149 if (copy_from_user(&info
, arg
, sizeof(info
)))
5152 rdev
= find_rdev_nr(mddev
, info
.number
);
5154 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5155 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5156 info
.raid_disk
= rdev
->raid_disk
;
5158 if (test_bit(Faulty
, &rdev
->flags
))
5159 info
.state
|= (1<<MD_DISK_FAULTY
);
5160 else if (test_bit(In_sync
, &rdev
->flags
)) {
5161 info
.state
|= (1<<MD_DISK_ACTIVE
);
5162 info
.state
|= (1<<MD_DISK_SYNC
);
5164 if (test_bit(WriteMostly
, &rdev
->flags
))
5165 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5167 info
.major
= info
.minor
= 0;
5168 info
.raid_disk
= -1;
5169 info
.state
= (1<<MD_DISK_REMOVED
);
5172 if (copy_to_user(arg
, &info
, sizeof(info
)))
5178 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5180 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5182 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5184 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5187 if (!mddev
->raid_disks
) {
5189 /* expecting a device which has a superblock */
5190 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5193 "md: md_import_device returned %ld\n",
5195 return PTR_ERR(rdev
);
5197 if (!list_empty(&mddev
->disks
)) {
5198 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5199 mdk_rdev_t
, same_set
);
5200 err
= super_types
[mddev
->major_version
]
5201 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5204 "md: %s has different UUID to %s\n",
5205 bdevname(rdev
->bdev
,b
),
5206 bdevname(rdev0
->bdev
,b2
));
5211 err
= bind_rdev_to_array(rdev
, mddev
);
5218 * add_new_disk can be used once the array is assembled
5219 * to add "hot spares". They must already have a superblock
5224 if (!mddev
->pers
->hot_add_disk
) {
5226 "%s: personality does not support diskops!\n",
5230 if (mddev
->persistent
)
5231 rdev
= md_import_device(dev
, mddev
->major_version
,
5232 mddev
->minor_version
);
5234 rdev
= md_import_device(dev
, -1, -1);
5237 "md: md_import_device returned %ld\n",
5239 return PTR_ERR(rdev
);
5241 /* set saved_raid_disk if appropriate */
5242 if (!mddev
->persistent
) {
5243 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5244 info
->raid_disk
< mddev
->raid_disks
) {
5245 rdev
->raid_disk
= info
->raid_disk
;
5246 set_bit(In_sync
, &rdev
->flags
);
5248 rdev
->raid_disk
= -1;
5250 super_types
[mddev
->major_version
].
5251 validate_super(mddev
, rdev
);
5252 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5253 (!test_bit(In_sync
, &rdev
->flags
) ||
5254 rdev
->raid_disk
!= info
->raid_disk
)) {
5255 /* This was a hot-add request, but events doesn't
5256 * match, so reject it.
5262 if (test_bit(In_sync
, &rdev
->flags
))
5263 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5265 rdev
->saved_raid_disk
= -1;
5267 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5268 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5269 set_bit(WriteMostly
, &rdev
->flags
);
5271 clear_bit(WriteMostly
, &rdev
->flags
);
5273 rdev
->raid_disk
= -1;
5274 err
= bind_rdev_to_array(rdev
, mddev
);
5275 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5276 /* If there is hot_add_disk but no hot_remove_disk
5277 * then added disks for geometry changes,
5278 * and should be added immediately.
5280 super_types
[mddev
->major_version
].
5281 validate_super(mddev
, rdev
);
5282 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5284 unbind_rdev_from_array(rdev
);
5289 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5291 md_update_sb(mddev
, 1);
5292 if (mddev
->degraded
)
5293 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5294 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5296 md_new_event(mddev
);
5297 md_wakeup_thread(mddev
->thread
);
5301 /* otherwise, add_new_disk is only allowed
5302 * for major_version==0 superblocks
5304 if (mddev
->major_version
!= 0) {
5305 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5310 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5312 rdev
= md_import_device(dev
, -1, 0);
5315 "md: error, md_import_device() returned %ld\n",
5317 return PTR_ERR(rdev
);
5319 rdev
->desc_nr
= info
->number
;
5320 if (info
->raid_disk
< mddev
->raid_disks
)
5321 rdev
->raid_disk
= info
->raid_disk
;
5323 rdev
->raid_disk
= -1;
5325 if (rdev
->raid_disk
< mddev
->raid_disks
)
5326 if (info
->state
& (1<<MD_DISK_SYNC
))
5327 set_bit(In_sync
, &rdev
->flags
);
5329 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5330 set_bit(WriteMostly
, &rdev
->flags
);
5332 if (!mddev
->persistent
) {
5333 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5334 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5336 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5337 rdev
->sectors
= rdev
->sb_start
;
5339 err
= bind_rdev_to_array(rdev
, mddev
);
5349 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5351 char b
[BDEVNAME_SIZE
];
5354 rdev
= find_rdev(mddev
, dev
);
5358 if (rdev
->raid_disk
>= 0)
5361 kick_rdev_from_array(rdev
);
5362 md_update_sb(mddev
, 1);
5363 md_new_event(mddev
);
5367 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5368 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5372 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5374 char b
[BDEVNAME_SIZE
];
5381 if (mddev
->major_version
!= 0) {
5382 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5383 " version-0 superblocks.\n",
5387 if (!mddev
->pers
->hot_add_disk
) {
5389 "%s: personality does not support diskops!\n",
5394 rdev
= md_import_device(dev
, -1, 0);
5397 "md: error, md_import_device() returned %ld\n",
5402 if (mddev
->persistent
)
5403 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5405 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5407 rdev
->sectors
= rdev
->sb_start
;
5409 if (test_bit(Faulty
, &rdev
->flags
)) {
5411 "md: can not hot-add faulty %s disk to %s!\n",
5412 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5416 clear_bit(In_sync
, &rdev
->flags
);
5418 rdev
->saved_raid_disk
= -1;
5419 err
= bind_rdev_to_array(rdev
, mddev
);
5424 * The rest should better be atomic, we can have disk failures
5425 * noticed in interrupt contexts ...
5428 rdev
->raid_disk
= -1;
5430 md_update_sb(mddev
, 1);
5433 * Kick recovery, maybe this spare has to be added to the
5434 * array immediately.
5436 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5437 md_wakeup_thread(mddev
->thread
);
5438 md_new_event(mddev
);
5446 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5451 if (!mddev
->pers
->quiesce
)
5453 if (mddev
->recovery
|| mddev
->sync_thread
)
5455 /* we should be able to change the bitmap.. */
5461 return -EEXIST
; /* cannot add when bitmap is present */
5462 mddev
->bitmap_info
.file
= fget(fd
);
5464 if (mddev
->bitmap_info
.file
== NULL
) {
5465 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5470 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5472 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5474 fput(mddev
->bitmap_info
.file
);
5475 mddev
->bitmap_info
.file
= NULL
;
5478 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5479 } else if (mddev
->bitmap
== NULL
)
5480 return -ENOENT
; /* cannot remove what isn't there */
5483 mddev
->pers
->quiesce(mddev
, 1);
5485 err
= bitmap_create(mddev
);
5487 err
= bitmap_load(mddev
);
5489 if (fd
< 0 || err
) {
5490 bitmap_destroy(mddev
);
5491 fd
= -1; /* make sure to put the file */
5493 mddev
->pers
->quiesce(mddev
, 0);
5496 if (mddev
->bitmap_info
.file
) {
5497 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5498 fput(mddev
->bitmap_info
.file
);
5500 mddev
->bitmap_info
.file
= NULL
;
5507 * set_array_info is used two different ways
5508 * The original usage is when creating a new array.
5509 * In this usage, raid_disks is > 0 and it together with
5510 * level, size, not_persistent,layout,chunksize determine the
5511 * shape of the array.
5512 * This will always create an array with a type-0.90.0 superblock.
5513 * The newer usage is when assembling an array.
5514 * In this case raid_disks will be 0, and the major_version field is
5515 * use to determine which style super-blocks are to be found on the devices.
5516 * The minor and patch _version numbers are also kept incase the
5517 * super_block handler wishes to interpret them.
5519 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5522 if (info
->raid_disks
== 0) {
5523 /* just setting version number for superblock loading */
5524 if (info
->major_version
< 0 ||
5525 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5526 super_types
[info
->major_version
].name
== NULL
) {
5527 /* maybe try to auto-load a module? */
5529 "md: superblock version %d not known\n",
5530 info
->major_version
);
5533 mddev
->major_version
= info
->major_version
;
5534 mddev
->minor_version
= info
->minor_version
;
5535 mddev
->patch_version
= info
->patch_version
;
5536 mddev
->persistent
= !info
->not_persistent
;
5537 /* ensure mddev_put doesn't delete this now that there
5538 * is some minimal configuration.
5540 mddev
->ctime
= get_seconds();
5543 mddev
->major_version
= MD_MAJOR_VERSION
;
5544 mddev
->minor_version
= MD_MINOR_VERSION
;
5545 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5546 mddev
->ctime
= get_seconds();
5548 mddev
->level
= info
->level
;
5549 mddev
->clevel
[0] = 0;
5550 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5551 mddev
->raid_disks
= info
->raid_disks
;
5552 /* don't set md_minor, it is determined by which /dev/md* was
5555 if (info
->state
& (1<<MD_SB_CLEAN
))
5556 mddev
->recovery_cp
= MaxSector
;
5558 mddev
->recovery_cp
= 0;
5559 mddev
->persistent
= ! info
->not_persistent
;
5560 mddev
->external
= 0;
5562 mddev
->layout
= info
->layout
;
5563 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5565 mddev
->max_disks
= MD_SB_DISKS
;
5567 if (mddev
->persistent
)
5569 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5571 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5572 mddev
->bitmap_info
.offset
= 0;
5574 mddev
->reshape_position
= MaxSector
;
5577 * Generate a 128 bit UUID
5579 get_random_bytes(mddev
->uuid
, 16);
5581 mddev
->new_level
= mddev
->level
;
5582 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5583 mddev
->new_layout
= mddev
->layout
;
5584 mddev
->delta_disks
= 0;
5589 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5591 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5593 if (mddev
->external_size
)
5596 mddev
->array_sectors
= array_sectors
;
5598 EXPORT_SYMBOL(md_set_array_sectors
);
5600 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5604 int fit
= (num_sectors
== 0);
5606 if (mddev
->pers
->resize
== NULL
)
5608 /* The "num_sectors" is the number of sectors of each device that
5609 * is used. This can only make sense for arrays with redundancy.
5610 * linear and raid0 always use whatever space is available. We can only
5611 * consider changing this number if no resync or reconstruction is
5612 * happening, and if the new size is acceptable. It must fit before the
5613 * sb_start or, if that is <data_offset, it must fit before the size
5614 * of each device. If num_sectors is zero, we find the largest size
5617 if (mddev
->sync_thread
)
5620 /* Sorry, cannot grow a bitmap yet, just remove it,
5624 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5625 sector_t avail
= rdev
->sectors
;
5627 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5628 num_sectors
= avail
;
5629 if (avail
< num_sectors
)
5632 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5634 revalidate_disk(mddev
->gendisk
);
5638 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5641 /* change the number of raid disks */
5642 if (mddev
->pers
->check_reshape
== NULL
)
5644 if (raid_disks
<= 0 ||
5645 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5647 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5649 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5651 rv
= mddev
->pers
->check_reshape(mddev
);
5653 mddev
->delta_disks
= 0;
5659 * update_array_info is used to change the configuration of an
5661 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5662 * fields in the info are checked against the array.
5663 * Any differences that cannot be handled will cause an error.
5664 * Normally, only one change can be managed at a time.
5666 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5672 /* calculate expected state,ignoring low bits */
5673 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5674 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5676 if (mddev
->major_version
!= info
->major_version
||
5677 mddev
->minor_version
!= info
->minor_version
||
5678 /* mddev->patch_version != info->patch_version || */
5679 mddev
->ctime
!= info
->ctime
||
5680 mddev
->level
!= info
->level
||
5681 /* mddev->layout != info->layout || */
5682 !mddev
->persistent
!= info
->not_persistent
||
5683 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5684 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5685 ((state
^info
->state
) & 0xfffffe00)
5688 /* Check there is only one change */
5689 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5691 if (mddev
->raid_disks
!= info
->raid_disks
)
5693 if (mddev
->layout
!= info
->layout
)
5695 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5702 if (mddev
->layout
!= info
->layout
) {
5704 * we don't need to do anything at the md level, the
5705 * personality will take care of it all.
5707 if (mddev
->pers
->check_reshape
== NULL
)
5710 mddev
->new_layout
= info
->layout
;
5711 rv
= mddev
->pers
->check_reshape(mddev
);
5713 mddev
->new_layout
= mddev
->layout
;
5717 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5718 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5720 if (mddev
->raid_disks
!= info
->raid_disks
)
5721 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5723 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5724 if (mddev
->pers
->quiesce
== NULL
)
5726 if (mddev
->recovery
|| mddev
->sync_thread
)
5728 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5729 /* add the bitmap */
5732 if (mddev
->bitmap_info
.default_offset
== 0)
5734 mddev
->bitmap_info
.offset
=
5735 mddev
->bitmap_info
.default_offset
;
5736 mddev
->pers
->quiesce(mddev
, 1);
5737 rv
= bitmap_create(mddev
);
5739 rv
= bitmap_load(mddev
);
5741 bitmap_destroy(mddev
);
5742 mddev
->pers
->quiesce(mddev
, 0);
5744 /* remove the bitmap */
5747 if (mddev
->bitmap
->file
)
5749 mddev
->pers
->quiesce(mddev
, 1);
5750 bitmap_destroy(mddev
);
5751 mddev
->pers
->quiesce(mddev
, 0);
5752 mddev
->bitmap_info
.offset
= 0;
5755 md_update_sb(mddev
, 1);
5759 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5763 if (mddev
->pers
== NULL
)
5766 rdev
= find_rdev(mddev
, dev
);
5770 md_error(mddev
, rdev
);
5775 * We have a problem here : there is no easy way to give a CHS
5776 * virtual geometry. We currently pretend that we have a 2 heads
5777 * 4 sectors (with a BIG number of cylinders...). This drives
5778 * dosfs just mad... ;-)
5780 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5782 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5786 geo
->cylinders
= mddev
->array_sectors
/ 8;
5790 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5791 unsigned int cmd
, unsigned long arg
)
5794 void __user
*argp
= (void __user
*)arg
;
5795 mddev_t
*mddev
= NULL
;
5798 if (!capable(CAP_SYS_ADMIN
))
5802 * Commands dealing with the RAID driver but not any
5808 err
= get_version(argp
);
5811 case PRINT_RAID_DEBUG
:
5819 autostart_arrays(arg
);
5826 * Commands creating/starting a new array:
5829 mddev
= bdev
->bd_disk
->private_data
;
5836 err
= mddev_lock(mddev
);
5839 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5846 case SET_ARRAY_INFO
:
5848 mdu_array_info_t info
;
5850 memset(&info
, 0, sizeof(info
));
5851 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5856 err
= update_array_info(mddev
, &info
);
5858 printk(KERN_WARNING
"md: couldn't update"
5859 " array info. %d\n", err
);
5864 if (!list_empty(&mddev
->disks
)) {
5866 "md: array %s already has disks!\n",
5871 if (mddev
->raid_disks
) {
5873 "md: array %s already initialised!\n",
5878 err
= set_array_info(mddev
, &info
);
5880 printk(KERN_WARNING
"md: couldn't set"
5881 " array info. %d\n", err
);
5891 * Commands querying/configuring an existing array:
5893 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5894 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5895 if ((!mddev
->raid_disks
&& !mddev
->external
)
5896 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5897 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5898 && cmd
!= GET_BITMAP_FILE
) {
5904 * Commands even a read-only array can execute:
5908 case GET_ARRAY_INFO
:
5909 err
= get_array_info(mddev
, argp
);
5912 case GET_BITMAP_FILE
:
5913 err
= get_bitmap_file(mddev
, argp
);
5917 err
= get_disk_info(mddev
, argp
);
5920 case RESTART_ARRAY_RW
:
5921 err
= restart_array(mddev
);
5925 err
= do_md_stop(mddev
, 0, 1);
5929 err
= md_set_readonly(mddev
, 1);
5933 if (get_user(ro
, (int __user
*)(arg
))) {
5939 /* if the bdev is going readonly the value of mddev->ro
5940 * does not matter, no writes are coming
5945 /* are we are already prepared for writes? */
5949 /* transitioning to readauto need only happen for
5950 * arrays that call md_write_start
5953 err
= restart_array(mddev
);
5956 set_disk_ro(mddev
->gendisk
, 0);
5963 * The remaining ioctls are changing the state of the
5964 * superblock, so we do not allow them on read-only arrays.
5965 * However non-MD ioctls (e.g. get-size) will still come through
5966 * here and hit the 'default' below, so only disallow
5967 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5969 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5970 if (mddev
->ro
== 2) {
5972 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5973 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5974 md_wakeup_thread(mddev
->thread
);
5985 mdu_disk_info_t info
;
5986 if (copy_from_user(&info
, argp
, sizeof(info
)))
5989 err
= add_new_disk(mddev
, &info
);
5993 case HOT_REMOVE_DISK
:
5994 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5998 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6001 case SET_DISK_FAULTY
:
6002 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6006 err
= do_md_run(mddev
);
6009 case SET_BITMAP_FILE
:
6010 err
= set_bitmap_file(mddev
, (int)arg
);
6020 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6022 mddev
->hold_active
= 0;
6023 mddev_unlock(mddev
);
6032 #ifdef CONFIG_COMPAT
6033 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6034 unsigned int cmd
, unsigned long arg
)
6037 case HOT_REMOVE_DISK
:
6039 case SET_DISK_FAULTY
:
6040 case SET_BITMAP_FILE
:
6041 /* These take in integer arg, do not convert */
6044 arg
= (unsigned long)compat_ptr(arg
);
6048 return md_ioctl(bdev
, mode
, cmd
, arg
);
6050 #endif /* CONFIG_COMPAT */
6052 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6055 * Succeed if we can lock the mddev, which confirms that
6056 * it isn't being stopped right now.
6058 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
6061 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6062 /* we are racing with mddev_put which is discarding this
6066 /* Wait until bdev->bd_disk is definitely gone */
6067 flush_workqueue(md_misc_wq
);
6068 /* Then retry the open from the top */
6069 return -ERESTARTSYS
;
6071 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6073 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6077 atomic_inc(&mddev
->openers
);
6078 mutex_unlock(&mddev
->open_mutex
);
6080 check_disk_change(bdev
);
6085 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6087 mddev_t
*mddev
= disk
->private_data
;
6090 atomic_dec(&mddev
->openers
);
6096 static int md_media_changed(struct gendisk
*disk
)
6098 mddev_t
*mddev
= disk
->private_data
;
6100 return mddev
->changed
;
6103 static int md_revalidate(struct gendisk
*disk
)
6105 mddev_t
*mddev
= disk
->private_data
;
6110 static const struct block_device_operations md_fops
=
6112 .owner
= THIS_MODULE
,
6114 .release
= md_release
,
6116 #ifdef CONFIG_COMPAT
6117 .compat_ioctl
= md_compat_ioctl
,
6119 .getgeo
= md_getgeo
,
6120 .media_changed
= md_media_changed
,
6121 .revalidate_disk
= md_revalidate
,
6124 static int md_thread(void * arg
)
6126 mdk_thread_t
*thread
= arg
;
6129 * md_thread is a 'system-thread', it's priority should be very
6130 * high. We avoid resource deadlocks individually in each
6131 * raid personality. (RAID5 does preallocation) We also use RR and
6132 * the very same RT priority as kswapd, thus we will never get
6133 * into a priority inversion deadlock.
6135 * we definitely have to have equal or higher priority than
6136 * bdflush, otherwise bdflush will deadlock if there are too
6137 * many dirty RAID5 blocks.
6140 allow_signal(SIGKILL
);
6141 while (!kthread_should_stop()) {
6143 /* We need to wait INTERRUPTIBLE so that
6144 * we don't add to the load-average.
6145 * That means we need to be sure no signals are
6148 if (signal_pending(current
))
6149 flush_signals(current
);
6151 wait_event_interruptible_timeout
6153 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6154 || kthread_should_stop(),
6157 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6158 if (!kthread_should_stop())
6159 thread
->run(thread
->mddev
);
6165 void md_wakeup_thread(mdk_thread_t
*thread
)
6168 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6169 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6170 wake_up(&thread
->wqueue
);
6174 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6177 mdk_thread_t
*thread
;
6179 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6183 init_waitqueue_head(&thread
->wqueue
);
6186 thread
->mddev
= mddev
;
6187 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6188 thread
->tsk
= kthread_run(md_thread
, thread
,
6190 mdname(thread
->mddev
),
6191 name
?: mddev
->pers
->name
);
6192 if (IS_ERR(thread
->tsk
)) {
6199 void md_unregister_thread(mdk_thread_t
**threadp
)
6201 mdk_thread_t
*thread
= *threadp
;
6204 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6205 /* Locking ensures that mddev_unlock does not wake_up a
6206 * non-existent thread
6208 spin_lock(&pers_lock
);
6210 spin_unlock(&pers_lock
);
6212 kthread_stop(thread
->tsk
);
6216 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6223 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6226 if (mddev
->external
)
6227 set_bit(Blocked
, &rdev
->flags
);
6229 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6231 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6232 __builtin_return_address(0),__builtin_return_address(1),
6233 __builtin_return_address(2),__builtin_return_address(3));
6237 if (!mddev
->pers
->error_handler
)
6239 mddev
->pers
->error_handler(mddev
,rdev
);
6240 if (mddev
->degraded
)
6241 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6242 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6243 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6244 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6245 md_wakeup_thread(mddev
->thread
);
6246 if (mddev
->event_work
.func
)
6247 queue_work(md_misc_wq
, &mddev
->event_work
);
6248 md_new_event_inintr(mddev
);
6251 /* seq_file implementation /proc/mdstat */
6253 static void status_unused(struct seq_file
*seq
)
6258 seq_printf(seq
, "unused devices: ");
6260 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6261 char b
[BDEVNAME_SIZE
];
6263 seq_printf(seq
, "%s ",
6264 bdevname(rdev
->bdev
,b
));
6267 seq_printf(seq
, "<none>");
6269 seq_printf(seq
, "\n");
6273 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6275 sector_t max_sectors
, resync
, res
;
6276 unsigned long dt
, db
;
6279 unsigned int per_milli
;
6281 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6283 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6284 max_sectors
= mddev
->resync_max_sectors
;
6286 max_sectors
= mddev
->dev_sectors
;
6289 * Should not happen.
6295 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6296 * in a sector_t, and (max_sectors>>scale) will fit in a
6297 * u32, as those are the requirements for sector_div.
6298 * Thus 'scale' must be at least 10
6301 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6302 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6305 res
= (resync
>>scale
)*1000;
6306 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6310 int i
, x
= per_milli
/50, y
= 20-x
;
6311 seq_printf(seq
, "[");
6312 for (i
= 0; i
< x
; i
++)
6313 seq_printf(seq
, "=");
6314 seq_printf(seq
, ">");
6315 for (i
= 0; i
< y
; i
++)
6316 seq_printf(seq
, ".");
6317 seq_printf(seq
, "] ");
6319 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6320 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6322 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6324 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6325 "resync" : "recovery"))),
6326 per_milli
/10, per_milli
% 10,
6327 (unsigned long long) resync
/2,
6328 (unsigned long long) max_sectors
/2);
6331 * dt: time from mark until now
6332 * db: blocks written from mark until now
6333 * rt: remaining time
6335 * rt is a sector_t, so could be 32bit or 64bit.
6336 * So we divide before multiply in case it is 32bit and close
6338 * We scale the divisor (db) by 32 to avoid losing precision
6339 * near the end of resync when the number of remaining sectors
6341 * We then divide rt by 32 after multiplying by db to compensate.
6342 * The '+1' avoids division by zero if db is very small.
6344 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6346 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6347 - mddev
->resync_mark_cnt
;
6349 rt
= max_sectors
- resync
; /* number of remaining sectors */
6350 sector_div(rt
, db
/32+1);
6354 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6355 ((unsigned long)rt
% 60)/6);
6357 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6360 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6362 struct list_head
*tmp
;
6372 spin_lock(&all_mddevs_lock
);
6373 list_for_each(tmp
,&all_mddevs
)
6375 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6377 spin_unlock(&all_mddevs_lock
);
6380 spin_unlock(&all_mddevs_lock
);
6382 return (void*)2;/* tail */
6386 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6388 struct list_head
*tmp
;
6389 mddev_t
*next_mddev
, *mddev
= v
;
6395 spin_lock(&all_mddevs_lock
);
6397 tmp
= all_mddevs
.next
;
6399 tmp
= mddev
->all_mddevs
.next
;
6400 if (tmp
!= &all_mddevs
)
6401 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6403 next_mddev
= (void*)2;
6406 spin_unlock(&all_mddevs_lock
);
6414 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6418 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6422 struct mdstat_info
{
6426 static int md_seq_show(struct seq_file
*seq
, void *v
)
6431 struct mdstat_info
*mi
= seq
->private;
6432 struct bitmap
*bitmap
;
6434 if (v
== (void*)1) {
6435 struct mdk_personality
*pers
;
6436 seq_printf(seq
, "Personalities : ");
6437 spin_lock(&pers_lock
);
6438 list_for_each_entry(pers
, &pers_list
, list
)
6439 seq_printf(seq
, "[%s] ", pers
->name
);
6441 spin_unlock(&pers_lock
);
6442 seq_printf(seq
, "\n");
6443 mi
->event
= atomic_read(&md_event_count
);
6446 if (v
== (void*)2) {
6451 if (mddev_lock(mddev
) < 0)
6454 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6455 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6456 mddev
->pers
? "" : "in");
6459 seq_printf(seq
, " (read-only)");
6461 seq_printf(seq
, " (auto-read-only)");
6462 seq_printf(seq
, " %s", mddev
->pers
->name
);
6466 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6467 char b
[BDEVNAME_SIZE
];
6468 seq_printf(seq
, " %s[%d]",
6469 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6470 if (test_bit(WriteMostly
, &rdev
->flags
))
6471 seq_printf(seq
, "(W)");
6472 if (test_bit(Faulty
, &rdev
->flags
)) {
6473 seq_printf(seq
, "(F)");
6475 } else if (rdev
->raid_disk
< 0)
6476 seq_printf(seq
, "(S)"); /* spare */
6477 sectors
+= rdev
->sectors
;
6480 if (!list_empty(&mddev
->disks
)) {
6482 seq_printf(seq
, "\n %llu blocks",
6483 (unsigned long long)
6484 mddev
->array_sectors
/ 2);
6486 seq_printf(seq
, "\n %llu blocks",
6487 (unsigned long long)sectors
/ 2);
6489 if (mddev
->persistent
) {
6490 if (mddev
->major_version
!= 0 ||
6491 mddev
->minor_version
!= 90) {
6492 seq_printf(seq
," super %d.%d",
6493 mddev
->major_version
,
6494 mddev
->minor_version
);
6496 } else if (mddev
->external
)
6497 seq_printf(seq
, " super external:%s",
6498 mddev
->metadata_type
);
6500 seq_printf(seq
, " super non-persistent");
6503 mddev
->pers
->status(seq
, mddev
);
6504 seq_printf(seq
, "\n ");
6505 if (mddev
->pers
->sync_request
) {
6506 if (mddev
->curr_resync
> 2) {
6507 status_resync(seq
, mddev
);
6508 seq_printf(seq
, "\n ");
6509 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6510 seq_printf(seq
, "\tresync=DELAYED\n ");
6511 else if (mddev
->recovery_cp
< MaxSector
)
6512 seq_printf(seq
, "\tresync=PENDING\n ");
6515 seq_printf(seq
, "\n ");
6517 if ((bitmap
= mddev
->bitmap
)) {
6518 unsigned long chunk_kb
;
6519 unsigned long flags
;
6520 spin_lock_irqsave(&bitmap
->lock
, flags
);
6521 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6522 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6524 bitmap
->pages
- bitmap
->missing_pages
,
6526 (bitmap
->pages
- bitmap
->missing_pages
)
6527 << (PAGE_SHIFT
- 10),
6528 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6529 chunk_kb
? "KB" : "B");
6531 seq_printf(seq
, ", file: ");
6532 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6535 seq_printf(seq
, "\n");
6536 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6539 seq_printf(seq
, "\n");
6541 mddev_unlock(mddev
);
6546 static const struct seq_operations md_seq_ops
= {
6547 .start
= md_seq_start
,
6548 .next
= md_seq_next
,
6549 .stop
= md_seq_stop
,
6550 .show
= md_seq_show
,
6553 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6556 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6560 error
= seq_open(file
, &md_seq_ops
);
6564 struct seq_file
*p
= file
->private_data
;
6566 mi
->event
= atomic_read(&md_event_count
);
6571 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6573 struct seq_file
*m
= filp
->private_data
;
6574 struct mdstat_info
*mi
= m
->private;
6577 poll_wait(filp
, &md_event_waiters
, wait
);
6579 /* always allow read */
6580 mask
= POLLIN
| POLLRDNORM
;
6582 if (mi
->event
!= atomic_read(&md_event_count
))
6583 mask
|= POLLERR
| POLLPRI
;
6587 static const struct file_operations md_seq_fops
= {
6588 .owner
= THIS_MODULE
,
6589 .open
= md_seq_open
,
6591 .llseek
= seq_lseek
,
6592 .release
= seq_release_private
,
6593 .poll
= mdstat_poll
,
6596 int register_md_personality(struct mdk_personality
*p
)
6598 spin_lock(&pers_lock
);
6599 list_add_tail(&p
->list
, &pers_list
);
6600 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6601 spin_unlock(&pers_lock
);
6605 int unregister_md_personality(struct mdk_personality
*p
)
6607 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6608 spin_lock(&pers_lock
);
6609 list_del_init(&p
->list
);
6610 spin_unlock(&pers_lock
);
6614 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6622 rdev_for_each_rcu(rdev
, mddev
) {
6623 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6624 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6625 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6626 atomic_read(&disk
->sync_io
);
6627 /* sync IO will cause sync_io to increase before the disk_stats
6628 * as sync_io is counted when a request starts, and
6629 * disk_stats is counted when it completes.
6630 * So resync activity will cause curr_events to be smaller than
6631 * when there was no such activity.
6632 * non-sync IO will cause disk_stat to increase without
6633 * increasing sync_io so curr_events will (eventually)
6634 * be larger than it was before. Once it becomes
6635 * substantially larger, the test below will cause
6636 * the array to appear non-idle, and resync will slow
6638 * If there is a lot of outstanding resync activity when
6639 * we set last_event to curr_events, then all that activity
6640 * completing might cause the array to appear non-idle
6641 * and resync will be slowed down even though there might
6642 * not have been non-resync activity. This will only
6643 * happen once though. 'last_events' will soon reflect
6644 * the state where there is little or no outstanding
6645 * resync requests, and further resync activity will
6646 * always make curr_events less than last_events.
6649 if (init
|| curr_events
- rdev
->last_events
> 64) {
6650 rdev
->last_events
= curr_events
;
6658 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6660 /* another "blocks" (512byte) blocks have been synced */
6661 atomic_sub(blocks
, &mddev
->recovery_active
);
6662 wake_up(&mddev
->recovery_wait
);
6664 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6665 md_wakeup_thread(mddev
->thread
);
6666 // stop recovery, signal do_sync ....
6671 /* md_write_start(mddev, bi)
6672 * If we need to update some array metadata (e.g. 'active' flag
6673 * in superblock) before writing, schedule a superblock update
6674 * and wait for it to complete.
6676 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6679 if (bio_data_dir(bi
) != WRITE
)
6682 BUG_ON(mddev
->ro
== 1);
6683 if (mddev
->ro
== 2) {
6684 /* need to switch to read/write */
6686 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6687 md_wakeup_thread(mddev
->thread
);
6688 md_wakeup_thread(mddev
->sync_thread
);
6691 atomic_inc(&mddev
->writes_pending
);
6692 if (mddev
->safemode
== 1)
6693 mddev
->safemode
= 0;
6694 if (mddev
->in_sync
) {
6695 spin_lock_irq(&mddev
->write_lock
);
6696 if (mddev
->in_sync
) {
6698 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6699 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6700 md_wakeup_thread(mddev
->thread
);
6703 spin_unlock_irq(&mddev
->write_lock
);
6706 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6707 wait_event(mddev
->sb_wait
,
6708 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6711 void md_write_end(mddev_t
*mddev
)
6713 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6714 if (mddev
->safemode
== 2)
6715 md_wakeup_thread(mddev
->thread
);
6716 else if (mddev
->safemode_delay
)
6717 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6721 /* md_allow_write(mddev)
6722 * Calling this ensures that the array is marked 'active' so that writes
6723 * may proceed without blocking. It is important to call this before
6724 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6725 * Must be called with mddev_lock held.
6727 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6728 * is dropped, so return -EAGAIN after notifying userspace.
6730 int md_allow_write(mddev_t
*mddev
)
6736 if (!mddev
->pers
->sync_request
)
6739 spin_lock_irq(&mddev
->write_lock
);
6740 if (mddev
->in_sync
) {
6742 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6743 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6744 if (mddev
->safemode_delay
&&
6745 mddev
->safemode
== 0)
6746 mddev
->safemode
= 1;
6747 spin_unlock_irq(&mddev
->write_lock
);
6748 md_update_sb(mddev
, 0);
6749 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6751 spin_unlock_irq(&mddev
->write_lock
);
6753 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6758 EXPORT_SYMBOL_GPL(md_allow_write
);
6760 #define SYNC_MARKS 10
6761 #define SYNC_MARK_STEP (3*HZ)
6762 void md_do_sync(mddev_t
*mddev
)
6765 unsigned int currspeed
= 0,
6767 sector_t max_sectors
,j
, io_sectors
;
6768 unsigned long mark
[SYNC_MARKS
];
6769 sector_t mark_cnt
[SYNC_MARKS
];
6771 struct list_head
*tmp
;
6772 sector_t last_check
;
6777 /* just incase thread restarts... */
6778 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6780 if (mddev
->ro
) /* never try to sync a read-only array */
6783 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6784 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6785 desc
= "data-check";
6786 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6787 desc
= "requested-resync";
6790 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6795 /* we overload curr_resync somewhat here.
6796 * 0 == not engaged in resync at all
6797 * 2 == checking that there is no conflict with another sync
6798 * 1 == like 2, but have yielded to allow conflicting resync to
6800 * other == active in resync - this many blocks
6802 * Before starting a resync we must have set curr_resync to
6803 * 2, and then checked that every "conflicting" array has curr_resync
6804 * less than ours. When we find one that is the same or higher
6805 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6806 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6807 * This will mean we have to start checking from the beginning again.
6812 mddev
->curr_resync
= 2;
6815 if (kthread_should_stop())
6816 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6818 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6820 for_each_mddev(mddev2
, tmp
) {
6821 if (mddev2
== mddev
)
6823 if (!mddev
->parallel_resync
6824 && mddev2
->curr_resync
6825 && match_mddev_units(mddev
, mddev2
)) {
6827 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6828 /* arbitrarily yield */
6829 mddev
->curr_resync
= 1;
6830 wake_up(&resync_wait
);
6832 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6833 /* no need to wait here, we can wait the next
6834 * time 'round when curr_resync == 2
6837 /* We need to wait 'interruptible' so as not to
6838 * contribute to the load average, and not to
6839 * be caught by 'softlockup'
6841 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6842 if (!kthread_should_stop() &&
6843 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6844 printk(KERN_INFO
"md: delaying %s of %s"
6845 " until %s has finished (they"
6846 " share one or more physical units)\n",
6847 desc
, mdname(mddev
), mdname(mddev2
));
6849 if (signal_pending(current
))
6850 flush_signals(current
);
6852 finish_wait(&resync_wait
, &wq
);
6855 finish_wait(&resync_wait
, &wq
);
6858 } while (mddev
->curr_resync
< 2);
6861 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6862 /* resync follows the size requested by the personality,
6863 * which defaults to physical size, but can be virtual size
6865 max_sectors
= mddev
->resync_max_sectors
;
6866 mddev
->resync_mismatches
= 0;
6867 /* we don't use the checkpoint if there's a bitmap */
6868 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6869 j
= mddev
->resync_min
;
6870 else if (!mddev
->bitmap
)
6871 j
= mddev
->recovery_cp
;
6873 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6874 max_sectors
= mddev
->dev_sectors
;
6876 /* recovery follows the physical size of devices */
6877 max_sectors
= mddev
->dev_sectors
;
6880 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6881 if (rdev
->raid_disk
>= 0 &&
6882 !test_bit(Faulty
, &rdev
->flags
) &&
6883 !test_bit(In_sync
, &rdev
->flags
) &&
6884 rdev
->recovery_offset
< j
)
6885 j
= rdev
->recovery_offset
;
6889 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6890 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6891 " %d KB/sec/disk.\n", speed_min(mddev
));
6892 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6893 "(but not more than %d KB/sec) for %s.\n",
6894 speed_max(mddev
), desc
);
6896 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6899 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6901 mark_cnt
[m
] = io_sectors
;
6904 mddev
->resync_mark
= mark
[last_mark
];
6905 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6908 * Tune reconstruction:
6910 window
= 32*(PAGE_SIZE
/512);
6911 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
6912 window
/2, (unsigned long long)max_sectors
/2);
6914 atomic_set(&mddev
->recovery_active
, 0);
6919 "md: resuming %s of %s from checkpoint.\n",
6920 desc
, mdname(mddev
));
6921 mddev
->curr_resync
= j
;
6923 mddev
->curr_resync_completed
= j
;
6925 while (j
< max_sectors
) {
6930 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6931 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6932 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6933 > (max_sectors
>> 4)) ||
6934 (j
- mddev
->curr_resync_completed
)*2
6935 >= mddev
->resync_max
- mddev
->curr_resync_completed
6937 /* time to update curr_resync_completed */
6938 wait_event(mddev
->recovery_wait
,
6939 atomic_read(&mddev
->recovery_active
) == 0);
6940 mddev
->curr_resync_completed
= j
;
6941 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6942 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6945 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6946 /* As this condition is controlled by user-space,
6947 * we can block indefinitely, so use '_interruptible'
6948 * to avoid triggering warnings.
6950 flush_signals(current
); /* just in case */
6951 wait_event_interruptible(mddev
->recovery_wait
,
6952 mddev
->resync_max
> j
6953 || kthread_should_stop());
6956 if (kthread_should_stop())
6959 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6960 currspeed
< speed_min(mddev
));
6962 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6966 if (!skipped
) { /* actual IO requested */
6967 io_sectors
+= sectors
;
6968 atomic_add(sectors
, &mddev
->recovery_active
);
6972 if (j
>1) mddev
->curr_resync
= j
;
6973 mddev
->curr_mark_cnt
= io_sectors
;
6974 if (last_check
== 0)
6975 /* this is the earliers that rebuilt will be
6976 * visible in /proc/mdstat
6978 md_new_event(mddev
);
6980 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6983 last_check
= io_sectors
;
6985 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6989 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6991 int next
= (last_mark
+1) % SYNC_MARKS
;
6993 mddev
->resync_mark
= mark
[next
];
6994 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6995 mark
[next
] = jiffies
;
6996 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7001 if (kthread_should_stop())
7006 * this loop exits only if either when we are slower than
7007 * the 'hard' speed limit, or the system was IO-idle for
7009 * the system might be non-idle CPU-wise, but we only care
7010 * about not overloading the IO subsystem. (things like an
7011 * e2fsck being done on the RAID array should execute fast)
7015 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7016 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7018 if (currspeed
> speed_min(mddev
)) {
7019 if ((currspeed
> speed_max(mddev
)) ||
7020 !is_mddev_idle(mddev
, 0)) {
7026 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7028 * this also signals 'finished resyncing' to md_stop
7031 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7033 /* tell personality that we are finished */
7034 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7036 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7037 mddev
->curr_resync
> 2) {
7038 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7039 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7040 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7042 "md: checkpointing %s of %s.\n",
7043 desc
, mdname(mddev
));
7044 mddev
->recovery_cp
= mddev
->curr_resync
;
7047 mddev
->recovery_cp
= MaxSector
;
7049 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7050 mddev
->curr_resync
= MaxSector
;
7052 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
7053 if (rdev
->raid_disk
>= 0 &&
7054 mddev
->delta_disks
>= 0 &&
7055 !test_bit(Faulty
, &rdev
->flags
) &&
7056 !test_bit(In_sync
, &rdev
->flags
) &&
7057 rdev
->recovery_offset
< mddev
->curr_resync
)
7058 rdev
->recovery_offset
= mddev
->curr_resync
;
7062 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7065 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7066 /* We completed so min/max setting can be forgotten if used. */
7067 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7068 mddev
->resync_min
= 0;
7069 mddev
->resync_max
= MaxSector
;
7070 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7071 mddev
->resync_min
= mddev
->curr_resync_completed
;
7072 mddev
->curr_resync
= 0;
7073 wake_up(&resync_wait
);
7074 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7075 md_wakeup_thread(mddev
->thread
);
7080 * got a signal, exit.
7083 "md: md_do_sync() got signal ... exiting\n");
7084 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7088 EXPORT_SYMBOL_GPL(md_do_sync
);
7090 static int remove_and_add_spares(mddev_t
*mddev
)
7095 mddev
->curr_resync_completed
= 0;
7097 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7098 if (rdev
->raid_disk
>= 0 &&
7099 !test_bit(Blocked
, &rdev
->flags
) &&
7100 (test_bit(Faulty
, &rdev
->flags
) ||
7101 ! test_bit(In_sync
, &rdev
->flags
)) &&
7102 atomic_read(&rdev
->nr_pending
)==0) {
7103 if (mddev
->pers
->hot_remove_disk(
7104 mddev
, rdev
->raid_disk
)==0) {
7106 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7107 sysfs_remove_link(&mddev
->kobj
, nm
);
7108 rdev
->raid_disk
= -1;
7112 if (mddev
->degraded
&& !mddev
->recovery_disabled
) {
7113 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7114 if (rdev
->raid_disk
>= 0 &&
7115 !test_bit(In_sync
, &rdev
->flags
) &&
7116 !test_bit(Faulty
, &rdev
->flags
) &&
7117 !test_bit(Blocked
, &rdev
->flags
))
7119 if (rdev
->raid_disk
< 0
7120 && !test_bit(Faulty
, &rdev
->flags
)) {
7121 rdev
->recovery_offset
= 0;
7123 hot_add_disk(mddev
, rdev
) == 0) {
7125 sprintf(nm
, "rd%d", rdev
->raid_disk
);
7126 if (sysfs_create_link(&mddev
->kobj
,
7128 /* failure here is OK */;
7130 md_new_event(mddev
);
7131 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7140 static void reap_sync_thread(mddev_t
*mddev
)
7144 /* resync has finished, collect result */
7145 md_unregister_thread(&mddev
->sync_thread
);
7146 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7147 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7149 /* activate any spares */
7150 if (mddev
->pers
->spare_active(mddev
))
7151 sysfs_notify(&mddev
->kobj
, NULL
,
7154 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7155 mddev
->pers
->finish_reshape
)
7156 mddev
->pers
->finish_reshape(mddev
);
7157 md_update_sb(mddev
, 1);
7159 /* if array is no-longer degraded, then any saved_raid_disk
7160 * information must be scrapped
7162 if (!mddev
->degraded
)
7163 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7164 rdev
->saved_raid_disk
= -1;
7166 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7167 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7168 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7169 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7170 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7171 /* flag recovery needed just to double check */
7172 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7173 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7174 md_new_event(mddev
);
7178 * This routine is regularly called by all per-raid-array threads to
7179 * deal with generic issues like resync and super-block update.
7180 * Raid personalities that don't have a thread (linear/raid0) do not
7181 * need this as they never do any recovery or update the superblock.
7183 * It does not do any resync itself, but rather "forks" off other threads
7184 * to do that as needed.
7185 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7186 * "->recovery" and create a thread at ->sync_thread.
7187 * When the thread finishes it sets MD_RECOVERY_DONE
7188 * and wakeups up this thread which will reap the thread and finish up.
7189 * This thread also removes any faulty devices (with nr_pending == 0).
7191 * The overall approach is:
7192 * 1/ if the superblock needs updating, update it.
7193 * 2/ If a recovery thread is running, don't do anything else.
7194 * 3/ If recovery has finished, clean up, possibly marking spares active.
7195 * 4/ If there are any faulty devices, remove them.
7196 * 5/ If array is degraded, try to add spares devices
7197 * 6/ If array has spares or is not in-sync, start a resync thread.
7199 void md_check_recovery(mddev_t
*mddev
)
7201 if (mddev
->suspended
)
7205 bitmap_daemon_work(mddev
);
7210 if (signal_pending(current
)) {
7211 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7212 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7214 mddev
->safemode
= 2;
7216 flush_signals(current
);
7219 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7222 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7223 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7224 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7225 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7226 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7227 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7231 if (mddev_trylock(mddev
)) {
7235 /* Only thing we do on a ro array is remove
7239 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7240 if (rdev
->raid_disk
>= 0 &&
7241 !test_bit(Blocked
, &rdev
->flags
) &&
7242 test_bit(Faulty
, &rdev
->flags
) &&
7243 atomic_read(&rdev
->nr_pending
)==0) {
7244 if (mddev
->pers
->hot_remove_disk(
7245 mddev
, rdev
->raid_disk
)==0) {
7247 sprintf(nm
,"rd%d", rdev
->raid_disk
);
7248 sysfs_remove_link(&mddev
->kobj
, nm
);
7249 rdev
->raid_disk
= -1;
7252 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7256 if (!mddev
->external
) {
7258 spin_lock_irq(&mddev
->write_lock
);
7259 if (mddev
->safemode
&&
7260 !atomic_read(&mddev
->writes_pending
) &&
7262 mddev
->recovery_cp
== MaxSector
) {
7265 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7267 if (mddev
->safemode
== 1)
7268 mddev
->safemode
= 0;
7269 spin_unlock_irq(&mddev
->write_lock
);
7271 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7275 md_update_sb(mddev
, 0);
7277 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7278 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7279 /* resync/recovery still happening */
7280 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7283 if (mddev
->sync_thread
) {
7284 reap_sync_thread(mddev
);
7287 /* Set RUNNING before clearing NEEDED to avoid
7288 * any transients in the value of "sync_action".
7290 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7291 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7292 /* Clear some bits that don't mean anything, but
7295 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7296 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7298 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7300 /* no recovery is running.
7301 * remove any failed drives, then
7302 * add spares if possible.
7303 * Spare are also removed and re-added, to allow
7304 * the personality to fail the re-add.
7307 if (mddev
->reshape_position
!= MaxSector
) {
7308 if (mddev
->pers
->check_reshape
== NULL
||
7309 mddev
->pers
->check_reshape(mddev
) != 0)
7310 /* Cannot proceed */
7312 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7313 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7314 } else if ((spares
= remove_and_add_spares(mddev
))) {
7315 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7316 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7317 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7318 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7319 } else if (mddev
->recovery_cp
< MaxSector
) {
7320 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7321 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7322 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7323 /* nothing to be done ... */
7326 if (mddev
->pers
->sync_request
) {
7327 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7328 /* We are adding a device or devices to an array
7329 * which has the bitmap stored on all devices.
7330 * So make sure all bitmap pages get written
7332 bitmap_write_all(mddev
->bitmap
);
7334 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7337 if (!mddev
->sync_thread
) {
7338 printk(KERN_ERR
"%s: could not start resync"
7341 /* leave the spares where they are, it shouldn't hurt */
7342 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7343 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7344 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7345 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7346 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7348 md_wakeup_thread(mddev
->sync_thread
);
7349 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7350 md_new_event(mddev
);
7353 if (!mddev
->sync_thread
) {
7354 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7355 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7357 if (mddev
->sysfs_action
)
7358 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7360 mddev_unlock(mddev
);
7364 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7366 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7367 wait_event_timeout(rdev
->blocked_wait
,
7368 !test_bit(Blocked
, &rdev
->flags
),
7369 msecs_to_jiffies(5000));
7370 rdev_dec_pending(rdev
, mddev
);
7372 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7374 static int md_notify_reboot(struct notifier_block
*this,
7375 unsigned long code
, void *x
)
7377 struct list_head
*tmp
;
7380 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7382 printk(KERN_INFO
"md: stopping all md devices.\n");
7384 for_each_mddev(mddev
, tmp
)
7385 if (mddev_trylock(mddev
)) {
7386 /* Force a switch to readonly even array
7387 * appears to still be in use. Hence
7390 md_set_readonly(mddev
, 100);
7391 mddev_unlock(mddev
);
7394 * certain more exotic SCSI devices are known to be
7395 * volatile wrt too early system reboots. While the
7396 * right place to handle this issue is the given
7397 * driver, we do want to have a safe RAID driver ...
7404 static struct notifier_block md_notifier
= {
7405 .notifier_call
= md_notify_reboot
,
7407 .priority
= INT_MAX
, /* before any real devices */
7410 static void md_geninit(void)
7412 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7414 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7417 static int __init
md_init(void)
7421 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
7425 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
7429 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
7432 if ((ret
= register_blkdev(0, "mdp")) < 0)
7436 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7437 md_probe
, NULL
, NULL
);
7438 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7439 md_probe
, NULL
, NULL
);
7441 register_reboot_notifier(&md_notifier
);
7442 raid_table_header
= register_sysctl_table(raid_root_table
);
7448 unregister_blkdev(MD_MAJOR
, "md");
7450 destroy_workqueue(md_misc_wq
);
7452 destroy_workqueue(md_wq
);
7460 * Searches all registered partitions for autorun RAID arrays
7464 static LIST_HEAD(all_detected_devices
);
7465 struct detected_devices_node
{
7466 struct list_head list
;
7470 void md_autodetect_dev(dev_t dev
)
7472 struct detected_devices_node
*node_detected_dev
;
7474 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7475 if (node_detected_dev
) {
7476 node_detected_dev
->dev
= dev
;
7477 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7479 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7480 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7485 static void autostart_arrays(int part
)
7488 struct detected_devices_node
*node_detected_dev
;
7490 int i_scanned
, i_passed
;
7495 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7497 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7499 node_detected_dev
= list_entry(all_detected_devices
.next
,
7500 struct detected_devices_node
, list
);
7501 list_del(&node_detected_dev
->list
);
7502 dev
= node_detected_dev
->dev
;
7503 kfree(node_detected_dev
);
7504 rdev
= md_import_device(dev
,0, 90);
7508 if (test_bit(Faulty
, &rdev
->flags
)) {
7512 set_bit(AutoDetected
, &rdev
->flags
);
7513 list_add(&rdev
->same_set
, &pending_raid_disks
);
7517 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7518 i_scanned
, i_passed
);
7520 autorun_devices(part
);
7523 #endif /* !MODULE */
7525 static __exit
void md_exit(void)
7528 struct list_head
*tmp
;
7530 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7531 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7533 unregister_blkdev(MD_MAJOR
,"md");
7534 unregister_blkdev(mdp_major
, "mdp");
7535 unregister_reboot_notifier(&md_notifier
);
7536 unregister_sysctl_table(raid_table_header
);
7537 remove_proc_entry("mdstat", NULL
);
7538 for_each_mddev(mddev
, tmp
) {
7539 export_array(mddev
);
7540 mddev
->hold_active
= 0;
7542 destroy_workqueue(md_misc_wq
);
7543 destroy_workqueue(md_wq
);
7546 subsys_initcall(md_init
);
7547 module_exit(md_exit
)
7549 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7551 return sprintf(buffer
, "%d", start_readonly
);
7553 static int set_ro(const char *val
, struct kernel_param
*kp
)
7556 int num
= simple_strtoul(val
, &e
, 10);
7557 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7558 start_readonly
= num
;
7564 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7565 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7567 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7569 EXPORT_SYMBOL(register_md_personality
);
7570 EXPORT_SYMBOL(unregister_md_personality
);
7571 EXPORT_SYMBOL(md_error
);
7572 EXPORT_SYMBOL(md_done_sync
);
7573 EXPORT_SYMBOL(md_write_start
);
7574 EXPORT_SYMBOL(md_write_end
);
7575 EXPORT_SYMBOL(md_register_thread
);
7576 EXPORT_SYMBOL(md_unregister_thread
);
7577 EXPORT_SYMBOL(md_wakeup_thread
);
7578 EXPORT_SYMBOL(md_check_recovery
);
7579 MODULE_LICENSE("GPL");
7580 MODULE_DESCRIPTION("MD RAID framework");
7582 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);