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 static LIST_HEAD(pers_list
);
65 static DEFINE_SPINLOCK(pers_lock
);
67 static void md_print_devices(void);
69 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
70 static struct workqueue_struct
*md_wq
;
71 static struct workqueue_struct
*md_misc_wq
;
73 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
76 * Default number of read corrections we'll attempt on an rdev
77 * before ejecting it from the array. We divide the read error
78 * count by 2 for every hour elapsed between read errors.
80 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min
= 1000;
95 static int sysctl_speed_limit_max
= 200000;
96 static inline int speed_min(mddev_t
*mddev
)
98 return mddev
->sync_speed_min
?
99 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
102 static inline int speed_max(mddev_t
*mddev
)
104 return mddev
->sync_speed_max
?
105 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
108 static struct ctl_table_header
*raid_table_header
;
110 static ctl_table raid_table
[] = {
112 .procname
= "speed_limit_min",
113 .data
= &sysctl_speed_limit_min
,
114 .maxlen
= sizeof(int),
115 .mode
= S_IRUGO
|S_IWUSR
,
116 .proc_handler
= proc_dointvec
,
119 .procname
= "speed_limit_max",
120 .data
= &sysctl_speed_limit_max
,
121 .maxlen
= sizeof(int),
122 .mode
= S_IRUGO
|S_IWUSR
,
123 .proc_handler
= proc_dointvec
,
128 static ctl_table raid_dir_table
[] = {
132 .mode
= S_IRUGO
|S_IXUGO
,
138 static ctl_table raid_root_table
[] = {
143 .child
= raid_dir_table
,
148 static const struct block_device_operations md_fops
;
150 static int start_readonly
;
153 * like bio_clone, but with a local bio set
156 static void mddev_bio_destructor(struct bio
*bio
)
158 mddev_t
*mddev
, **mddevp
;
163 bio_free(bio
, mddev
->bio_set
);
166 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
172 if (!mddev
|| !mddev
->bio_set
)
173 return bio_alloc(gfp_mask
, nr_iovecs
);
175 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
,
181 b
->bi_destructor
= mddev_bio_destructor
;
184 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
186 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
192 if (!mddev
|| !mddev
->bio_set
)
193 return bio_clone(bio
, gfp_mask
);
195 b
= bio_alloc_bioset(gfp_mask
, bio
->bi_max_vecs
,
201 b
->bi_destructor
= mddev_bio_destructor
;
203 if (bio_integrity(bio
)) {
206 ret
= bio_integrity_clone(b
, bio
, gfp_mask
, mddev
->bio_set
);
216 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
219 * We have a system wide 'event count' that is incremented
220 * on any 'interesting' event, and readers of /proc/mdstat
221 * can use 'poll' or 'select' to find out when the event
225 * start array, stop array, error, add device, remove device,
226 * start build, activate spare
228 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
229 static atomic_t md_event_count
;
230 void md_new_event(mddev_t
*mddev
)
232 atomic_inc(&md_event_count
);
233 wake_up(&md_event_waiters
);
235 EXPORT_SYMBOL_GPL(md_new_event
);
237 /* Alternate version that can be called from interrupts
238 * when calling sysfs_notify isn't needed.
240 static void md_new_event_inintr(mddev_t
*mddev
)
242 atomic_inc(&md_event_count
);
243 wake_up(&md_event_waiters
);
247 * Enables to iterate over all existing md arrays
248 * all_mddevs_lock protects this list.
250 static LIST_HEAD(all_mddevs
);
251 static DEFINE_SPINLOCK(all_mddevs_lock
);
255 * iterates through all used mddevs in the system.
256 * We take care to grab the all_mddevs_lock whenever navigating
257 * the list, and to always hold a refcount when unlocked.
258 * Any code which breaks out of this loop while own
259 * a reference to the current mddev and must mddev_put it.
261 #define for_each_mddev(mddev,tmp) \
263 for (({ spin_lock(&all_mddevs_lock); \
264 tmp = all_mddevs.next; \
266 ({ if (tmp != &all_mddevs) \
267 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
268 spin_unlock(&all_mddevs_lock); \
269 if (mddev) mddev_put(mddev); \
270 mddev = list_entry(tmp, mddev_t, all_mddevs); \
271 tmp != &all_mddevs;}); \
272 ({ spin_lock(&all_mddevs_lock); \
277 /* Rather than calling directly into the personality make_request function,
278 * IO requests come here first so that we can check if the device is
279 * being suspended pending a reconfiguration.
280 * We hold a refcount over the call to ->make_request. By the time that
281 * call has finished, the bio has been linked into some internal structure
282 * and so is visible to ->quiesce(), so we don't need the refcount any more.
284 static int md_make_request(struct request_queue
*q
, struct bio
*bio
)
286 const int rw
= bio_data_dir(bio
);
287 mddev_t
*mddev
= q
->queuedata
;
290 unsigned int sectors
;
292 if (mddev
== NULL
|| mddev
->pers
== NULL
297 smp_rmb(); /* Ensure implications of 'active' are visible */
299 if (mddev
->suspended
) {
302 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
303 TASK_UNINTERRUPTIBLE
);
304 if (!mddev
->suspended
)
310 finish_wait(&mddev
->sb_wait
, &__wait
);
312 atomic_inc(&mddev
->active_io
);
316 * save the sectors now since our bio can
317 * go away inside make_request
319 sectors
= bio_sectors(bio
);
320 rv
= mddev
->pers
->make_request(mddev
, bio
);
322 cpu
= part_stat_lock();
323 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
324 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
327 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
328 wake_up(&mddev
->sb_wait
);
333 /* mddev_suspend makes sure no new requests are submitted
334 * to the device, and that any requests that have been submitted
335 * are completely handled.
336 * Once ->stop is called and completes, the module will be completely
339 void mddev_suspend(mddev_t
*mddev
)
341 BUG_ON(mddev
->suspended
);
342 mddev
->suspended
= 1;
344 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
345 mddev
->pers
->quiesce(mddev
, 1);
347 EXPORT_SYMBOL_GPL(mddev_suspend
);
349 void mddev_resume(mddev_t
*mddev
)
351 mddev
->suspended
= 0;
352 wake_up(&mddev
->sb_wait
);
353 mddev
->pers
->quiesce(mddev
, 0);
355 md_wakeup_thread(mddev
->thread
);
356 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
358 EXPORT_SYMBOL_GPL(mddev_resume
);
360 int mddev_congested(mddev_t
*mddev
, int bits
)
362 return mddev
->suspended
;
364 EXPORT_SYMBOL(mddev_congested
);
367 * Generic flush handling for md
370 static void md_end_flush(struct bio
*bio
, int err
)
372 mdk_rdev_t
*rdev
= bio
->bi_private
;
373 mddev_t
*mddev
= rdev
->mddev
;
375 rdev_dec_pending(rdev
, mddev
);
377 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
378 /* The pre-request flush has finished */
379 queue_work(md_wq
, &mddev
->flush_work
);
384 static void md_submit_flush_data(struct work_struct
*ws
);
386 static void submit_flushes(struct work_struct
*ws
)
388 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
391 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
392 atomic_set(&mddev
->flush_pending
, 1);
394 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
395 if (rdev
->raid_disk
>= 0 &&
396 !test_bit(Faulty
, &rdev
->flags
)) {
397 /* Take two references, one is dropped
398 * when request finishes, one after
399 * we reclaim rcu_read_lock
402 atomic_inc(&rdev
->nr_pending
);
403 atomic_inc(&rdev
->nr_pending
);
405 bi
= bio_alloc_mddev(GFP_KERNEL
, 0, mddev
);
406 bi
->bi_end_io
= md_end_flush
;
407 bi
->bi_private
= rdev
;
408 bi
->bi_bdev
= rdev
->bdev
;
409 atomic_inc(&mddev
->flush_pending
);
410 submit_bio(WRITE_FLUSH
, bi
);
412 rdev_dec_pending(rdev
, mddev
);
415 if (atomic_dec_and_test(&mddev
->flush_pending
))
416 queue_work(md_wq
, &mddev
->flush_work
);
419 static void md_submit_flush_data(struct work_struct
*ws
)
421 mddev_t
*mddev
= container_of(ws
, mddev_t
, flush_work
);
422 struct bio
*bio
= mddev
->flush_bio
;
424 if (bio
->bi_size
== 0)
425 /* an empty barrier - all done */
428 bio
->bi_rw
&= ~REQ_FLUSH
;
429 if (mddev
->pers
->make_request(mddev
, bio
))
430 generic_make_request(bio
);
433 mddev
->flush_bio
= NULL
;
434 wake_up(&mddev
->sb_wait
);
437 void md_flush_request(mddev_t
*mddev
, struct bio
*bio
)
439 spin_lock_irq(&mddev
->write_lock
);
440 wait_event_lock_irq(mddev
->sb_wait
,
442 mddev
->write_lock
, /*nothing*/);
443 mddev
->flush_bio
= bio
;
444 spin_unlock_irq(&mddev
->write_lock
);
446 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
447 queue_work(md_wq
, &mddev
->flush_work
);
449 EXPORT_SYMBOL(md_flush_request
);
451 /* Support for plugging.
452 * This mirrors the plugging support in request_queue, but does not
453 * require having a whole queue or request structures.
454 * We allocate an md_plug_cb for each md device and each thread it gets
455 * plugged on. This links tot the private plug_handle structure in the
456 * personality data where we keep a count of the number of outstanding
457 * plugs so other code can see if a plug is active.
460 struct blk_plug_cb cb
;
464 static void plugger_unplug(struct blk_plug_cb
*cb
)
466 struct md_plug_cb
*mdcb
= container_of(cb
, struct md_plug_cb
, cb
);
467 if (atomic_dec_and_test(&mdcb
->mddev
->plug_cnt
))
468 md_wakeup_thread(mdcb
->mddev
->thread
);
472 /* Check that an unplug wakeup will come shortly.
473 * If not, wakeup the md thread immediately
475 int mddev_check_plugged(mddev_t
*mddev
)
477 struct blk_plug
*plug
= current
->plug
;
478 struct md_plug_cb
*mdcb
;
483 list_for_each_entry(mdcb
, &plug
->cb_list
, cb
.list
) {
484 if (mdcb
->cb
.callback
== plugger_unplug
&&
485 mdcb
->mddev
== mddev
) {
486 /* Already on the list, move to top */
487 if (mdcb
!= list_first_entry(&plug
->cb_list
,
490 list_move(&mdcb
->cb
.list
, &plug
->cb_list
);
494 /* Not currently on the callback list */
495 mdcb
= kmalloc(sizeof(*mdcb
), GFP_ATOMIC
);
500 mdcb
->cb
.callback
= plugger_unplug
;
501 atomic_inc(&mddev
->plug_cnt
);
502 list_add(&mdcb
->cb
.list
, &plug
->cb_list
);
505 EXPORT_SYMBOL_GPL(mddev_check_plugged
);
507 static inline mddev_t
*mddev_get(mddev_t
*mddev
)
509 atomic_inc(&mddev
->active
);
513 static void mddev_delayed_delete(struct work_struct
*ws
);
515 static void mddev_put(mddev_t
*mddev
)
517 struct bio_set
*bs
= NULL
;
519 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
521 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
522 mddev
->ctime
== 0 && !mddev
->hold_active
) {
523 /* Array is not configured at all, and not held active,
525 list_del(&mddev
->all_mddevs
);
527 mddev
->bio_set
= NULL
;
528 if (mddev
->gendisk
) {
529 /* We did a probe so need to clean up. Call
530 * queue_work inside the spinlock so that
531 * flush_workqueue() after mddev_find will
532 * succeed in waiting for the work to be done.
534 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
535 queue_work(md_misc_wq
, &mddev
->del_work
);
539 spin_unlock(&all_mddevs_lock
);
544 void mddev_init(mddev_t
*mddev
)
546 mutex_init(&mddev
->open_mutex
);
547 mutex_init(&mddev
->reconfig_mutex
);
548 mutex_init(&mddev
->bitmap_info
.mutex
);
549 INIT_LIST_HEAD(&mddev
->disks
);
550 INIT_LIST_HEAD(&mddev
->all_mddevs
);
551 init_timer(&mddev
->safemode_timer
);
552 atomic_set(&mddev
->active
, 1);
553 atomic_set(&mddev
->openers
, 0);
554 atomic_set(&mddev
->active_io
, 0);
555 atomic_set(&mddev
->plug_cnt
, 0);
556 spin_lock_init(&mddev
->write_lock
);
557 atomic_set(&mddev
->flush_pending
, 0);
558 init_waitqueue_head(&mddev
->sb_wait
);
559 init_waitqueue_head(&mddev
->recovery_wait
);
560 mddev
->reshape_position
= MaxSector
;
561 mddev
->resync_min
= 0;
562 mddev
->resync_max
= MaxSector
;
563 mddev
->level
= LEVEL_NONE
;
565 EXPORT_SYMBOL_GPL(mddev_init
);
567 static mddev_t
* mddev_find(dev_t unit
)
569 mddev_t
*mddev
, *new = NULL
;
571 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
572 unit
&= ~((1<<MdpMinorShift
)-1);
575 spin_lock(&all_mddevs_lock
);
578 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
579 if (mddev
->unit
== unit
) {
581 spin_unlock(&all_mddevs_lock
);
587 list_add(&new->all_mddevs
, &all_mddevs
);
588 spin_unlock(&all_mddevs_lock
);
589 new->hold_active
= UNTIL_IOCTL
;
593 /* find an unused unit number */
594 static int next_minor
= 512;
595 int start
= next_minor
;
599 dev
= MKDEV(MD_MAJOR
, next_minor
);
601 if (next_minor
> MINORMASK
)
603 if (next_minor
== start
) {
604 /* Oh dear, all in use. */
605 spin_unlock(&all_mddevs_lock
);
611 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
612 if (mddev
->unit
== dev
) {
618 new->md_minor
= MINOR(dev
);
619 new->hold_active
= UNTIL_STOP
;
620 list_add(&new->all_mddevs
, &all_mddevs
);
621 spin_unlock(&all_mddevs_lock
);
624 spin_unlock(&all_mddevs_lock
);
626 new = kzalloc(sizeof(*new), GFP_KERNEL
);
631 if (MAJOR(unit
) == MD_MAJOR
)
632 new->md_minor
= MINOR(unit
);
634 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
641 static inline int mddev_lock(mddev_t
* mddev
)
643 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
646 static inline int mddev_is_locked(mddev_t
*mddev
)
648 return mutex_is_locked(&mddev
->reconfig_mutex
);
651 static inline int mddev_trylock(mddev_t
* mddev
)
653 return mutex_trylock(&mddev
->reconfig_mutex
);
656 static struct attribute_group md_redundancy_group
;
658 static void mddev_unlock(mddev_t
* mddev
)
660 if (mddev
->to_remove
) {
661 /* These cannot be removed under reconfig_mutex as
662 * an access to the files will try to take reconfig_mutex
663 * while holding the file unremovable, which leads to
665 * So hold set sysfs_active while the remove in happeing,
666 * and anything else which might set ->to_remove or my
667 * otherwise change the sysfs namespace will fail with
668 * -EBUSY if sysfs_active is still set.
669 * We set sysfs_active under reconfig_mutex and elsewhere
670 * test it under the same mutex to ensure its correct value
673 struct attribute_group
*to_remove
= mddev
->to_remove
;
674 mddev
->to_remove
= NULL
;
675 mddev
->sysfs_active
= 1;
676 mutex_unlock(&mddev
->reconfig_mutex
);
678 if (mddev
->kobj
.sd
) {
679 if (to_remove
!= &md_redundancy_group
)
680 sysfs_remove_group(&mddev
->kobj
, to_remove
);
681 if (mddev
->pers
== NULL
||
682 mddev
->pers
->sync_request
== NULL
) {
683 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
684 if (mddev
->sysfs_action
)
685 sysfs_put(mddev
->sysfs_action
);
686 mddev
->sysfs_action
= NULL
;
689 mddev
->sysfs_active
= 0;
691 mutex_unlock(&mddev
->reconfig_mutex
);
693 md_wakeup_thread(mddev
->thread
);
696 static mdk_rdev_t
* find_rdev_nr(mddev_t
*mddev
, int nr
)
700 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
701 if (rdev
->desc_nr
== nr
)
707 static mdk_rdev_t
* find_rdev(mddev_t
* mddev
, dev_t dev
)
711 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
712 if (rdev
->bdev
->bd_dev
== dev
)
718 static struct mdk_personality
*find_pers(int level
, char *clevel
)
720 struct mdk_personality
*pers
;
721 list_for_each_entry(pers
, &pers_list
, list
) {
722 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
724 if (strcmp(pers
->name
, clevel
)==0)
730 /* return the offset of the super block in 512byte sectors */
731 static inline sector_t
calc_dev_sboffset(mdk_rdev_t
*rdev
)
733 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
734 return MD_NEW_SIZE_SECTORS(num_sectors
);
737 static int alloc_disk_sb(mdk_rdev_t
* rdev
)
742 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
743 if (!rdev
->sb_page
) {
744 printk(KERN_ALERT
"md: out of memory.\n");
751 static void free_disk_sb(mdk_rdev_t
* rdev
)
754 put_page(rdev
->sb_page
);
756 rdev
->sb_page
= NULL
;
763 static void super_written(struct bio
*bio
, int error
)
765 mdk_rdev_t
*rdev
= bio
->bi_private
;
766 mddev_t
*mddev
= rdev
->mddev
;
768 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
769 printk("md: super_written gets error=%d, uptodate=%d\n",
770 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
771 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
772 md_error(mddev
, rdev
);
775 if (atomic_dec_and_test(&mddev
->pending_writes
))
776 wake_up(&mddev
->sb_wait
);
780 void md_super_write(mddev_t
*mddev
, mdk_rdev_t
*rdev
,
781 sector_t sector
, int size
, struct page
*page
)
783 /* write first size bytes of page to sector of rdev
784 * Increment mddev->pending_writes before returning
785 * and decrement it on completion, waking up sb_wait
786 * if zero is reached.
787 * If an error occurred, call md_error
789 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
791 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
792 bio
->bi_sector
= sector
;
793 bio_add_page(bio
, page
, size
, 0);
794 bio
->bi_private
= rdev
;
795 bio
->bi_end_io
= super_written
;
797 atomic_inc(&mddev
->pending_writes
);
798 submit_bio(REQ_WRITE
| REQ_SYNC
| REQ_FLUSH
| REQ_FUA
, bio
);
801 void md_super_wait(mddev_t
*mddev
)
803 /* wait for all superblock writes that were scheduled to complete */
806 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
807 if (atomic_read(&mddev
->pending_writes
)==0)
811 finish_wait(&mddev
->sb_wait
, &wq
);
814 static void bi_complete(struct bio
*bio
, int error
)
816 complete((struct completion
*)bio
->bi_private
);
819 int sync_page_io(mdk_rdev_t
*rdev
, sector_t sector
, int size
,
820 struct page
*page
, int rw
, bool metadata_op
)
822 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
823 struct completion event
;
828 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
829 rdev
->meta_bdev
: rdev
->bdev
;
831 bio
->bi_sector
= sector
+ rdev
->sb_start
;
833 bio
->bi_sector
= sector
+ rdev
->data_offset
;
834 bio_add_page(bio
, page
, size
, 0);
835 init_completion(&event
);
836 bio
->bi_private
= &event
;
837 bio
->bi_end_io
= bi_complete
;
839 wait_for_completion(&event
);
841 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
845 EXPORT_SYMBOL_GPL(sync_page_io
);
847 static int read_disk_sb(mdk_rdev_t
* rdev
, int size
)
849 char b
[BDEVNAME_SIZE
];
850 if (!rdev
->sb_page
) {
858 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
864 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
865 bdevname(rdev
->bdev
,b
));
869 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
871 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
872 sb1
->set_uuid1
== sb2
->set_uuid1
&&
873 sb1
->set_uuid2
== sb2
->set_uuid2
&&
874 sb1
->set_uuid3
== sb2
->set_uuid3
;
877 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
880 mdp_super_t
*tmp1
, *tmp2
;
882 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
883 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
885 if (!tmp1
|| !tmp2
) {
887 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
895 * nr_disks is not constant
900 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
908 static u32
md_csum_fold(u32 csum
)
910 csum
= (csum
& 0xffff) + (csum
>> 16);
911 return (csum
& 0xffff) + (csum
>> 16);
914 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
917 u32
*sb32
= (u32
*)sb
;
919 unsigned int disk_csum
, csum
;
921 disk_csum
= sb
->sb_csum
;
924 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
926 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
930 /* This used to use csum_partial, which was wrong for several
931 * reasons including that different results are returned on
932 * different architectures. It isn't critical that we get exactly
933 * the same return value as before (we always csum_fold before
934 * testing, and that removes any differences). However as we
935 * know that csum_partial always returned a 16bit value on
936 * alphas, do a fold to maximise conformity to previous behaviour.
938 sb
->sb_csum
= md_csum_fold(disk_csum
);
940 sb
->sb_csum
= disk_csum
;
947 * Handle superblock details.
948 * We want to be able to handle multiple superblock formats
949 * so we have a common interface to them all, and an array of
950 * different handlers.
951 * We rely on user-space to write the initial superblock, and support
952 * reading and updating of superblocks.
953 * Interface methods are:
954 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
955 * loads and validates a superblock on dev.
956 * if refdev != NULL, compare superblocks on both devices
958 * 0 - dev has a superblock that is compatible with refdev
959 * 1 - dev has a superblock that is compatible and newer than refdev
960 * so dev should be used as the refdev in future
961 * -EINVAL superblock incompatible or invalid
962 * -othererror e.g. -EIO
964 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
965 * Verify that dev is acceptable into mddev.
966 * The first time, mddev->raid_disks will be 0, and data from
967 * dev should be merged in. Subsequent calls check that dev
968 * is new enough. Return 0 or -EINVAL
970 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
971 * Update the superblock for rdev with data in mddev
972 * This does not write to disc.
978 struct module
*owner
;
979 int (*load_super
)(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
,
981 int (*validate_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
982 void (*sync_super
)(mddev_t
*mddev
, mdk_rdev_t
*rdev
);
983 unsigned long long (*rdev_size_change
)(mdk_rdev_t
*rdev
,
984 sector_t num_sectors
);
988 * Check that the given mddev has no bitmap.
990 * This function is called from the run method of all personalities that do not
991 * support bitmaps. It prints an error message and returns non-zero if mddev
992 * has a bitmap. Otherwise, it returns 0.
995 int md_check_no_bitmap(mddev_t
*mddev
)
997 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
999 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
1000 mdname(mddev
), mddev
->pers
->name
);
1003 EXPORT_SYMBOL(md_check_no_bitmap
);
1006 * load_super for 0.90.0
1008 static int super_90_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1010 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1015 * Calculate the position of the superblock (512byte sectors),
1016 * it's at the end of the disk.
1018 * It also happens to be a multiple of 4Kb.
1020 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1022 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
1023 if (ret
) return ret
;
1027 bdevname(rdev
->bdev
, b
);
1028 sb
= page_address(rdev
->sb_page
);
1030 if (sb
->md_magic
!= MD_SB_MAGIC
) {
1031 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1036 if (sb
->major_version
!= 0 ||
1037 sb
->minor_version
< 90 ||
1038 sb
->minor_version
> 91) {
1039 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1040 sb
->major_version
, sb
->minor_version
,
1045 if (sb
->raid_disks
<= 0)
1048 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1049 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1054 rdev
->preferred_minor
= sb
->md_minor
;
1055 rdev
->data_offset
= 0;
1056 rdev
->sb_size
= MD_SB_BYTES
;
1058 if (sb
->level
== LEVEL_MULTIPATH
)
1061 rdev
->desc_nr
= sb
->this_disk
.number
;
1067 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1068 if (!uuid_equal(refsb
, sb
)) {
1069 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1070 b
, bdevname(refdev
->bdev
,b2
));
1073 if (!sb_equal(refsb
, sb
)) {
1074 printk(KERN_WARNING
"md: %s has same UUID"
1075 " but different superblock to %s\n",
1076 b
, bdevname(refdev
->bdev
, b2
));
1080 ev2
= md_event(refsb
);
1086 rdev
->sectors
= rdev
->sb_start
;
1088 if (rdev
->sectors
< sb
->size
* 2 && sb
->level
> 1)
1089 /* "this cannot possibly happen" ... */
1097 * validate_super for 0.90.0
1099 static int super_90_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1102 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1103 __u64 ev1
= md_event(sb
);
1105 rdev
->raid_disk
= -1;
1106 clear_bit(Faulty
, &rdev
->flags
);
1107 clear_bit(In_sync
, &rdev
->flags
);
1108 clear_bit(WriteMostly
, &rdev
->flags
);
1110 if (mddev
->raid_disks
== 0) {
1111 mddev
->major_version
= 0;
1112 mddev
->minor_version
= sb
->minor_version
;
1113 mddev
->patch_version
= sb
->patch_version
;
1114 mddev
->external
= 0;
1115 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1116 mddev
->ctime
= sb
->ctime
;
1117 mddev
->utime
= sb
->utime
;
1118 mddev
->level
= sb
->level
;
1119 mddev
->clevel
[0] = 0;
1120 mddev
->layout
= sb
->layout
;
1121 mddev
->raid_disks
= sb
->raid_disks
;
1122 mddev
->dev_sectors
= sb
->size
* 2;
1123 mddev
->events
= ev1
;
1124 mddev
->bitmap_info
.offset
= 0;
1125 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1127 if (mddev
->minor_version
>= 91) {
1128 mddev
->reshape_position
= sb
->reshape_position
;
1129 mddev
->delta_disks
= sb
->delta_disks
;
1130 mddev
->new_level
= sb
->new_level
;
1131 mddev
->new_layout
= sb
->new_layout
;
1132 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1134 mddev
->reshape_position
= MaxSector
;
1135 mddev
->delta_disks
= 0;
1136 mddev
->new_level
= mddev
->level
;
1137 mddev
->new_layout
= mddev
->layout
;
1138 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1141 if (sb
->state
& (1<<MD_SB_CLEAN
))
1142 mddev
->recovery_cp
= MaxSector
;
1144 if (sb
->events_hi
== sb
->cp_events_hi
&&
1145 sb
->events_lo
== sb
->cp_events_lo
) {
1146 mddev
->recovery_cp
= sb
->recovery_cp
;
1148 mddev
->recovery_cp
= 0;
1151 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1152 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1153 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1154 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1156 mddev
->max_disks
= MD_SB_DISKS
;
1158 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1159 mddev
->bitmap_info
.file
== NULL
)
1160 mddev
->bitmap_info
.offset
=
1161 mddev
->bitmap_info
.default_offset
;
1163 } else if (mddev
->pers
== NULL
) {
1164 /* Insist on good event counter while assembling, except
1165 * for spares (which don't need an event count) */
1167 if (sb
->disks
[rdev
->desc_nr
].state
& (
1168 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1169 if (ev1
< mddev
->events
)
1171 } else if (mddev
->bitmap
) {
1172 /* if adding to array with a bitmap, then we can accept an
1173 * older device ... but not too old.
1175 if (ev1
< mddev
->bitmap
->events_cleared
)
1178 if (ev1
< mddev
->events
)
1179 /* just a hot-add of a new device, leave raid_disk at -1 */
1183 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1184 desc
= sb
->disks
+ rdev
->desc_nr
;
1186 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1187 set_bit(Faulty
, &rdev
->flags
);
1188 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1189 desc->raid_disk < mddev->raid_disks */) {
1190 set_bit(In_sync
, &rdev
->flags
);
1191 rdev
->raid_disk
= desc
->raid_disk
;
1192 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1193 /* active but not in sync implies recovery up to
1194 * reshape position. We don't know exactly where
1195 * that is, so set to zero for now */
1196 if (mddev
->minor_version
>= 91) {
1197 rdev
->recovery_offset
= 0;
1198 rdev
->raid_disk
= desc
->raid_disk
;
1201 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1202 set_bit(WriteMostly
, &rdev
->flags
);
1203 } else /* MULTIPATH are always insync */
1204 set_bit(In_sync
, &rdev
->flags
);
1209 * sync_super for 0.90.0
1211 static void super_90_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1215 int next_spare
= mddev
->raid_disks
;
1218 /* make rdev->sb match mddev data..
1221 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1222 * 3/ any empty disks < next_spare become removed
1224 * disks[0] gets initialised to REMOVED because
1225 * we cannot be sure from other fields if it has
1226 * been initialised or not.
1229 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1231 rdev
->sb_size
= MD_SB_BYTES
;
1233 sb
= page_address(rdev
->sb_page
);
1235 memset(sb
, 0, sizeof(*sb
));
1237 sb
->md_magic
= MD_SB_MAGIC
;
1238 sb
->major_version
= mddev
->major_version
;
1239 sb
->patch_version
= mddev
->patch_version
;
1240 sb
->gvalid_words
= 0; /* ignored */
1241 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1242 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1243 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1244 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1246 sb
->ctime
= mddev
->ctime
;
1247 sb
->level
= mddev
->level
;
1248 sb
->size
= mddev
->dev_sectors
/ 2;
1249 sb
->raid_disks
= mddev
->raid_disks
;
1250 sb
->md_minor
= mddev
->md_minor
;
1251 sb
->not_persistent
= 0;
1252 sb
->utime
= mddev
->utime
;
1254 sb
->events_hi
= (mddev
->events
>>32);
1255 sb
->events_lo
= (u32
)mddev
->events
;
1257 if (mddev
->reshape_position
== MaxSector
)
1258 sb
->minor_version
= 90;
1260 sb
->minor_version
= 91;
1261 sb
->reshape_position
= mddev
->reshape_position
;
1262 sb
->new_level
= mddev
->new_level
;
1263 sb
->delta_disks
= mddev
->delta_disks
;
1264 sb
->new_layout
= mddev
->new_layout
;
1265 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1267 mddev
->minor_version
= sb
->minor_version
;
1270 sb
->recovery_cp
= mddev
->recovery_cp
;
1271 sb
->cp_events_hi
= (mddev
->events
>>32);
1272 sb
->cp_events_lo
= (u32
)mddev
->events
;
1273 if (mddev
->recovery_cp
== MaxSector
)
1274 sb
->state
= (1<< MD_SB_CLEAN
);
1276 sb
->recovery_cp
= 0;
1278 sb
->layout
= mddev
->layout
;
1279 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1281 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1282 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1284 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1285 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1288 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1290 if (rdev2
->raid_disk
>= 0 &&
1291 sb
->minor_version
>= 91)
1292 /* we have nowhere to store the recovery_offset,
1293 * but if it is not below the reshape_position,
1294 * we can piggy-back on that.
1297 if (rdev2
->raid_disk
< 0 ||
1298 test_bit(Faulty
, &rdev2
->flags
))
1301 desc_nr
= rdev2
->raid_disk
;
1303 desc_nr
= next_spare
++;
1304 rdev2
->desc_nr
= desc_nr
;
1305 d
= &sb
->disks
[rdev2
->desc_nr
];
1307 d
->number
= rdev2
->desc_nr
;
1308 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1309 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1311 d
->raid_disk
= rdev2
->raid_disk
;
1313 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1314 if (test_bit(Faulty
, &rdev2
->flags
))
1315 d
->state
= (1<<MD_DISK_FAULTY
);
1316 else if (is_active
) {
1317 d
->state
= (1<<MD_DISK_ACTIVE
);
1318 if (test_bit(In_sync
, &rdev2
->flags
))
1319 d
->state
|= (1<<MD_DISK_SYNC
);
1327 if (test_bit(WriteMostly
, &rdev2
->flags
))
1328 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1330 /* now set the "removed" and "faulty" bits on any missing devices */
1331 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1332 mdp_disk_t
*d
= &sb
->disks
[i
];
1333 if (d
->state
== 0 && d
->number
== 0) {
1336 d
->state
= (1<<MD_DISK_REMOVED
);
1337 d
->state
|= (1<<MD_DISK_FAULTY
);
1341 sb
->nr_disks
= nr_disks
;
1342 sb
->active_disks
= active
;
1343 sb
->working_disks
= working
;
1344 sb
->failed_disks
= failed
;
1345 sb
->spare_disks
= spare
;
1347 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1348 sb
->sb_csum
= calc_sb_csum(sb
);
1352 * rdev_size_change for 0.90.0
1354 static unsigned long long
1355 super_90_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1357 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1358 return 0; /* component must fit device */
1359 if (rdev
->mddev
->bitmap_info
.offset
)
1360 return 0; /* can't move bitmap */
1361 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1362 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1363 num_sectors
= rdev
->sb_start
;
1364 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1366 md_super_wait(rdev
->mddev
);
1372 * version 1 superblock
1375 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1379 unsigned long long newcsum
;
1380 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1381 __le32
*isuper
= (__le32
*)sb
;
1384 disk_csum
= sb
->sb_csum
;
1387 for (i
=0; size
>=4; size
-= 4 )
1388 newcsum
+= le32_to_cpu(*isuper
++);
1391 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1393 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1394 sb
->sb_csum
= disk_csum
;
1395 return cpu_to_le32(csum
);
1398 static int super_1_load(mdk_rdev_t
*rdev
, mdk_rdev_t
*refdev
, int minor_version
)
1400 struct mdp_superblock_1
*sb
;
1403 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1407 * Calculate the position of the superblock in 512byte sectors.
1408 * It is always aligned to a 4K boundary and
1409 * depeding on minor_version, it can be:
1410 * 0: At least 8K, but less than 12K, from end of device
1411 * 1: At start of device
1412 * 2: 4K from start of device.
1414 switch(minor_version
) {
1416 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1418 sb_start
&= ~(sector_t
)(4*2-1);
1429 rdev
->sb_start
= sb_start
;
1431 /* superblock is rarely larger than 1K, but it can be larger,
1432 * and it is safe to read 4k, so we do that
1434 ret
= read_disk_sb(rdev
, 4096);
1435 if (ret
) return ret
;
1438 sb
= page_address(rdev
->sb_page
);
1440 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1441 sb
->major_version
!= cpu_to_le32(1) ||
1442 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1443 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1444 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1447 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1448 printk("md: invalid superblock checksum on %s\n",
1449 bdevname(rdev
->bdev
,b
));
1452 if (le64_to_cpu(sb
->data_size
) < 10) {
1453 printk("md: data_size too small on %s\n",
1454 bdevname(rdev
->bdev
,b
));
1458 rdev
->preferred_minor
= 0xffff;
1459 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1460 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1462 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1463 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1464 if (rdev
->sb_size
& bmask
)
1465 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1468 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1471 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1474 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1480 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1482 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1483 sb
->level
!= refsb
->level
||
1484 sb
->layout
!= refsb
->layout
||
1485 sb
->chunksize
!= refsb
->chunksize
) {
1486 printk(KERN_WARNING
"md: %s has strangely different"
1487 " superblock to %s\n",
1488 bdevname(rdev
->bdev
,b
),
1489 bdevname(refdev
->bdev
,b2
));
1492 ev1
= le64_to_cpu(sb
->events
);
1493 ev2
= le64_to_cpu(refsb
->events
);
1501 rdev
->sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
1502 le64_to_cpu(sb
->data_offset
);
1504 rdev
->sectors
= rdev
->sb_start
;
1505 if (rdev
->sectors
< le64_to_cpu(sb
->data_size
))
1507 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1508 if (le64_to_cpu(sb
->size
) > rdev
->sectors
)
1513 static int super_1_validate(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1515 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1516 __u64 ev1
= le64_to_cpu(sb
->events
);
1518 rdev
->raid_disk
= -1;
1519 clear_bit(Faulty
, &rdev
->flags
);
1520 clear_bit(In_sync
, &rdev
->flags
);
1521 clear_bit(WriteMostly
, &rdev
->flags
);
1523 if (mddev
->raid_disks
== 0) {
1524 mddev
->major_version
= 1;
1525 mddev
->patch_version
= 0;
1526 mddev
->external
= 0;
1527 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1528 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1529 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1530 mddev
->level
= le32_to_cpu(sb
->level
);
1531 mddev
->clevel
[0] = 0;
1532 mddev
->layout
= le32_to_cpu(sb
->layout
);
1533 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1534 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1535 mddev
->events
= ev1
;
1536 mddev
->bitmap_info
.offset
= 0;
1537 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1539 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1540 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1542 mddev
->max_disks
= (4096-256)/2;
1544 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1545 mddev
->bitmap_info
.file
== NULL
)
1546 mddev
->bitmap_info
.offset
=
1547 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1549 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1550 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1551 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1552 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1553 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1554 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1556 mddev
->reshape_position
= MaxSector
;
1557 mddev
->delta_disks
= 0;
1558 mddev
->new_level
= mddev
->level
;
1559 mddev
->new_layout
= mddev
->layout
;
1560 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1563 } else if (mddev
->pers
== NULL
) {
1564 /* Insist of good event counter while assembling, except for
1565 * spares (which don't need an event count) */
1567 if (rdev
->desc_nr
>= 0 &&
1568 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1569 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1570 if (ev1
< mddev
->events
)
1572 } else if (mddev
->bitmap
) {
1573 /* If adding to array with a bitmap, then we can accept an
1574 * older device, but not too old.
1576 if (ev1
< mddev
->bitmap
->events_cleared
)
1579 if (ev1
< mddev
->events
)
1580 /* just a hot-add of a new device, leave raid_disk at -1 */
1583 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1585 if (rdev
->desc_nr
< 0 ||
1586 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1590 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1592 case 0xffff: /* spare */
1594 case 0xfffe: /* faulty */
1595 set_bit(Faulty
, &rdev
->flags
);
1598 if ((le32_to_cpu(sb
->feature_map
) &
1599 MD_FEATURE_RECOVERY_OFFSET
))
1600 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1602 set_bit(In_sync
, &rdev
->flags
);
1603 rdev
->raid_disk
= role
;
1606 if (sb
->devflags
& WriteMostly1
)
1607 set_bit(WriteMostly
, &rdev
->flags
);
1608 } else /* MULTIPATH are always insync */
1609 set_bit(In_sync
, &rdev
->flags
);
1614 static void super_1_sync(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1616 struct mdp_superblock_1
*sb
;
1619 /* make rdev->sb match mddev and rdev data. */
1621 sb
= page_address(rdev
->sb_page
);
1623 sb
->feature_map
= 0;
1625 sb
->recovery_offset
= cpu_to_le64(0);
1626 memset(sb
->pad1
, 0, sizeof(sb
->pad1
));
1627 memset(sb
->pad2
, 0, sizeof(sb
->pad2
));
1628 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1630 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1631 sb
->events
= cpu_to_le64(mddev
->events
);
1633 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1635 sb
->resync_offset
= cpu_to_le64(0);
1637 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1639 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1640 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1641 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1642 sb
->level
= cpu_to_le32(mddev
->level
);
1643 sb
->layout
= cpu_to_le32(mddev
->layout
);
1645 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1646 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1647 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1650 if (rdev
->raid_disk
>= 0 &&
1651 !test_bit(In_sync
, &rdev
->flags
)) {
1653 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1654 sb
->recovery_offset
=
1655 cpu_to_le64(rdev
->recovery_offset
);
1658 if (mddev
->reshape_position
!= MaxSector
) {
1659 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1660 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1661 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1662 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1663 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1664 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1668 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
1669 if (rdev2
->desc_nr
+1 > max_dev
)
1670 max_dev
= rdev2
->desc_nr
+1;
1672 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1674 sb
->max_dev
= cpu_to_le32(max_dev
);
1675 rdev
->sb_size
= max_dev
* 2 + 256;
1676 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1677 if (rdev
->sb_size
& bmask
)
1678 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1680 max_dev
= le32_to_cpu(sb
->max_dev
);
1682 for (i
=0; i
<max_dev
;i
++)
1683 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1685 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
1687 if (test_bit(Faulty
, &rdev2
->flags
))
1688 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1689 else if (test_bit(In_sync
, &rdev2
->flags
))
1690 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1691 else if (rdev2
->raid_disk
>= 0)
1692 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1694 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1697 sb
->sb_csum
= calc_sb_1_csum(sb
);
1700 static unsigned long long
1701 super_1_rdev_size_change(mdk_rdev_t
*rdev
, sector_t num_sectors
)
1703 struct mdp_superblock_1
*sb
;
1704 sector_t max_sectors
;
1705 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1706 return 0; /* component must fit device */
1707 if (rdev
->sb_start
< rdev
->data_offset
) {
1708 /* minor versions 1 and 2; superblock before data */
1709 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1710 max_sectors
-= rdev
->data_offset
;
1711 if (!num_sectors
|| num_sectors
> max_sectors
)
1712 num_sectors
= max_sectors
;
1713 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1714 /* minor version 0 with bitmap we can't move */
1717 /* minor version 0; superblock after data */
1719 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1720 sb_start
&= ~(sector_t
)(4*2 - 1);
1721 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1722 if (!num_sectors
|| num_sectors
> max_sectors
)
1723 num_sectors
= max_sectors
;
1724 rdev
->sb_start
= sb_start
;
1726 sb
= page_address(rdev
->sb_page
);
1727 sb
->data_size
= cpu_to_le64(num_sectors
);
1728 sb
->super_offset
= rdev
->sb_start
;
1729 sb
->sb_csum
= calc_sb_1_csum(sb
);
1730 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1732 md_super_wait(rdev
->mddev
);
1736 static struct super_type super_types
[] = {
1739 .owner
= THIS_MODULE
,
1740 .load_super
= super_90_load
,
1741 .validate_super
= super_90_validate
,
1742 .sync_super
= super_90_sync
,
1743 .rdev_size_change
= super_90_rdev_size_change
,
1747 .owner
= THIS_MODULE
,
1748 .load_super
= super_1_load
,
1749 .validate_super
= super_1_validate
,
1750 .sync_super
= super_1_sync
,
1751 .rdev_size_change
= super_1_rdev_size_change
,
1755 static void sync_super(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
1757 if (mddev
->sync_super
) {
1758 mddev
->sync_super(mddev
, rdev
);
1762 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1764 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1767 static int match_mddev_units(mddev_t
*mddev1
, mddev_t
*mddev2
)
1769 mdk_rdev_t
*rdev
, *rdev2
;
1772 rdev_for_each_rcu(rdev
, mddev1
)
1773 rdev_for_each_rcu(rdev2
, mddev2
)
1774 if (rdev
->bdev
->bd_contains
==
1775 rdev2
->bdev
->bd_contains
) {
1783 static LIST_HEAD(pending_raid_disks
);
1786 * Try to register data integrity profile for an mddev
1788 * This is called when an array is started and after a disk has been kicked
1789 * from the array. It only succeeds if all working and active component devices
1790 * are integrity capable with matching profiles.
1792 int md_integrity_register(mddev_t
*mddev
)
1794 mdk_rdev_t
*rdev
, *reference
= NULL
;
1796 if (list_empty(&mddev
->disks
))
1797 return 0; /* nothing to do */
1798 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1799 return 0; /* shouldn't register, or already is */
1800 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
1801 /* skip spares and non-functional disks */
1802 if (test_bit(Faulty
, &rdev
->flags
))
1804 if (rdev
->raid_disk
< 0)
1807 /* Use the first rdev as the reference */
1811 /* does this rdev's profile match the reference profile? */
1812 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1813 rdev
->bdev
->bd_disk
) < 0)
1816 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1819 * All component devices are integrity capable and have matching
1820 * profiles, register the common profile for the md device.
1822 if (blk_integrity_register(mddev
->gendisk
,
1823 bdev_get_integrity(reference
->bdev
)) != 0) {
1824 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1828 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1829 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1830 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1836 EXPORT_SYMBOL(md_integrity_register
);
1838 /* Disable data integrity if non-capable/non-matching disk is being added */
1839 void md_integrity_add_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
1841 struct blk_integrity
*bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1842 struct blk_integrity
*bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1844 if (!bi_mddev
) /* nothing to do */
1846 if (rdev
->raid_disk
< 0) /* skip spares */
1848 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
1849 rdev
->bdev
->bd_disk
) >= 0)
1851 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
1852 blk_integrity_unregister(mddev
->gendisk
);
1854 EXPORT_SYMBOL(md_integrity_add_rdev
);
1856 static int bind_rdev_to_array(mdk_rdev_t
* rdev
, mddev_t
* mddev
)
1858 char b
[BDEVNAME_SIZE
];
1868 /* prevent duplicates */
1869 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
1872 /* make sure rdev->sectors exceeds mddev->dev_sectors */
1873 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
1874 rdev
->sectors
< mddev
->dev_sectors
)) {
1876 /* Cannot change size, so fail
1877 * If mddev->level <= 0, then we don't care
1878 * about aligning sizes (e.g. linear)
1880 if (mddev
->level
> 0)
1883 mddev
->dev_sectors
= rdev
->sectors
;
1886 /* Verify rdev->desc_nr is unique.
1887 * If it is -1, assign a free number, else
1888 * check number is not in use
1890 if (rdev
->desc_nr
< 0) {
1892 if (mddev
->pers
) choice
= mddev
->raid_disks
;
1893 while (find_rdev_nr(mddev
, choice
))
1895 rdev
->desc_nr
= choice
;
1897 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
1900 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
1901 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
1902 mdname(mddev
), mddev
->max_disks
);
1905 bdevname(rdev
->bdev
,b
);
1906 while ( (s
=strchr(b
, '/')) != NULL
)
1909 rdev
->mddev
= mddev
;
1910 printk(KERN_INFO
"md: bind<%s>\n", b
);
1912 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
1915 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
1916 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
1917 /* failure here is OK */;
1918 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
1920 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
1921 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
1923 /* May as well allow recovery to be retried once */
1924 mddev
->recovery_disabled
++;
1929 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
1934 static void md_delayed_delete(struct work_struct
*ws
)
1936 mdk_rdev_t
*rdev
= container_of(ws
, mdk_rdev_t
, del_work
);
1937 kobject_del(&rdev
->kobj
);
1938 kobject_put(&rdev
->kobj
);
1941 static void unbind_rdev_from_array(mdk_rdev_t
* rdev
)
1943 char b
[BDEVNAME_SIZE
];
1948 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
1949 list_del_rcu(&rdev
->same_set
);
1950 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
1952 sysfs_remove_link(&rdev
->kobj
, "block");
1953 sysfs_put(rdev
->sysfs_state
);
1954 rdev
->sysfs_state
= NULL
;
1955 kfree(rdev
->badblocks
.page
);
1956 rdev
->badblocks
.count
= 0;
1957 rdev
->badblocks
.page
= NULL
;
1958 /* We need to delay this, otherwise we can deadlock when
1959 * writing to 'remove' to "dev/state". We also need
1960 * to delay it due to rcu usage.
1963 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
1964 kobject_get(&rdev
->kobj
);
1965 queue_work(md_misc_wq
, &rdev
->del_work
);
1969 * prevent the device from being mounted, repartitioned or
1970 * otherwise reused by a RAID array (or any other kernel
1971 * subsystem), by bd_claiming the device.
1973 static int lock_rdev(mdk_rdev_t
*rdev
, dev_t dev
, int shared
)
1976 struct block_device
*bdev
;
1977 char b
[BDEVNAME_SIZE
];
1979 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
1980 shared
? (mdk_rdev_t
*)lock_rdev
: rdev
);
1982 printk(KERN_ERR
"md: could not open %s.\n",
1983 __bdevname(dev
, b
));
1984 return PTR_ERR(bdev
);
1990 static void unlock_rdev(mdk_rdev_t
*rdev
)
1992 struct block_device
*bdev
= rdev
->bdev
;
1996 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
1999 void md_autodetect_dev(dev_t dev
);
2001 static void export_rdev(mdk_rdev_t
* rdev
)
2003 char b
[BDEVNAME_SIZE
];
2004 printk(KERN_INFO
"md: export_rdev(%s)\n",
2005 bdevname(rdev
->bdev
,b
));
2010 if (test_bit(AutoDetected
, &rdev
->flags
))
2011 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2014 kobject_put(&rdev
->kobj
);
2017 static void kick_rdev_from_array(mdk_rdev_t
* rdev
)
2019 unbind_rdev_from_array(rdev
);
2023 static void export_array(mddev_t
*mddev
)
2025 mdk_rdev_t
*rdev
, *tmp
;
2027 rdev_for_each(rdev
, tmp
, mddev
) {
2032 kick_rdev_from_array(rdev
);
2034 if (!list_empty(&mddev
->disks
))
2036 mddev
->raid_disks
= 0;
2037 mddev
->major_version
= 0;
2040 static void print_desc(mdp_disk_t
*desc
)
2042 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2043 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2046 static void print_sb_90(mdp_super_t
*sb
)
2051 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2052 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2053 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2055 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2056 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2057 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2058 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2059 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2060 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2061 sb
->failed_disks
, sb
->spare_disks
,
2062 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2065 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2068 desc
= sb
->disks
+ i
;
2069 if (desc
->number
|| desc
->major
|| desc
->minor
||
2070 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2071 printk(" D %2d: ", i
);
2075 printk(KERN_INFO
"md: THIS: ");
2076 print_desc(&sb
->this_disk
);
2079 static void print_sb_1(struct mdp_superblock_1
*sb
)
2083 uuid
= sb
->set_uuid
;
2085 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2086 "md: Name: \"%s\" CT:%llu\n",
2087 le32_to_cpu(sb
->major_version
),
2088 le32_to_cpu(sb
->feature_map
),
2091 (unsigned long long)le64_to_cpu(sb
->ctime
)
2092 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2094 uuid
= sb
->device_uuid
;
2096 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2098 "md: Dev:%08x UUID: %pU\n"
2099 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2100 "md: (MaxDev:%u) \n",
2101 le32_to_cpu(sb
->level
),
2102 (unsigned long long)le64_to_cpu(sb
->size
),
2103 le32_to_cpu(sb
->raid_disks
),
2104 le32_to_cpu(sb
->layout
),
2105 le32_to_cpu(sb
->chunksize
),
2106 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2107 (unsigned long long)le64_to_cpu(sb
->data_size
),
2108 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2109 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2110 le32_to_cpu(sb
->dev_number
),
2113 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2114 (unsigned long long)le64_to_cpu(sb
->events
),
2115 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2116 le32_to_cpu(sb
->sb_csum
),
2117 le32_to_cpu(sb
->max_dev
)
2121 static void print_rdev(mdk_rdev_t
*rdev
, int major_version
)
2123 char b
[BDEVNAME_SIZE
];
2124 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2125 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2126 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2128 if (rdev
->sb_loaded
) {
2129 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2130 switch (major_version
) {
2132 print_sb_90(page_address(rdev
->sb_page
));
2135 print_sb_1(page_address(rdev
->sb_page
));
2139 printk(KERN_INFO
"md: no rdev superblock!\n");
2142 static void md_print_devices(void)
2144 struct list_head
*tmp
;
2147 char b
[BDEVNAME_SIZE
];
2150 printk("md: **********************************\n");
2151 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2152 printk("md: **********************************\n");
2153 for_each_mddev(mddev
, tmp
) {
2156 bitmap_print_sb(mddev
->bitmap
);
2158 printk("%s: ", mdname(mddev
));
2159 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2160 printk("<%s>", bdevname(rdev
->bdev
,b
));
2163 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
2164 print_rdev(rdev
, mddev
->major_version
);
2166 printk("md: **********************************\n");
2171 static void sync_sbs(mddev_t
* mddev
, int nospares
)
2173 /* Update each superblock (in-memory image), but
2174 * if we are allowed to, skip spares which already
2175 * have the right event counter, or have one earlier
2176 * (which would mean they aren't being marked as dirty
2177 * with the rest of the array)
2180 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2181 if (rdev
->sb_events
== mddev
->events
||
2183 rdev
->raid_disk
< 0 &&
2184 rdev
->sb_events
+1 == mddev
->events
)) {
2185 /* Don't update this superblock */
2186 rdev
->sb_loaded
= 2;
2188 sync_super(mddev
, rdev
);
2189 rdev
->sb_loaded
= 1;
2194 static void md_update_sb(mddev_t
* mddev
, int force_change
)
2201 /* First make sure individual recovery_offsets are correct */
2202 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2203 if (rdev
->raid_disk
>= 0 &&
2204 mddev
->delta_disks
>= 0 &&
2205 !test_bit(In_sync
, &rdev
->flags
) &&
2206 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2207 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2210 if (!mddev
->persistent
) {
2211 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2212 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2213 if (!mddev
->external
)
2214 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2215 wake_up(&mddev
->sb_wait
);
2219 spin_lock_irq(&mddev
->write_lock
);
2221 mddev
->utime
= get_seconds();
2223 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2225 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2226 /* just a clean<-> dirty transition, possibly leave spares alone,
2227 * though if events isn't the right even/odd, we will have to do
2233 if (mddev
->degraded
)
2234 /* If the array is degraded, then skipping spares is both
2235 * dangerous and fairly pointless.
2236 * Dangerous because a device that was removed from the array
2237 * might have a event_count that still looks up-to-date,
2238 * so it can be re-added without a resync.
2239 * Pointless because if there are any spares to skip,
2240 * then a recovery will happen and soon that array won't
2241 * be degraded any more and the spare can go back to sleep then.
2245 sync_req
= mddev
->in_sync
;
2247 /* If this is just a dirty<->clean transition, and the array is clean
2248 * and 'events' is odd, we can roll back to the previous clean state */
2250 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2251 && mddev
->can_decrease_events
2252 && mddev
->events
!= 1) {
2254 mddev
->can_decrease_events
= 0;
2256 /* otherwise we have to go forward and ... */
2258 mddev
->can_decrease_events
= nospares
;
2261 if (!mddev
->events
) {
2263 * oops, this 64-bit counter should never wrap.
2264 * Either we are in around ~1 trillion A.C., assuming
2265 * 1 reboot per second, or we have a bug:
2270 sync_sbs(mddev
, nospares
);
2271 spin_unlock_irq(&mddev
->write_lock
);
2274 "md: updating %s RAID superblock on device (in sync %d)\n",
2275 mdname(mddev
),mddev
->in_sync
);
2277 bitmap_update_sb(mddev
->bitmap
);
2278 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
2279 char b
[BDEVNAME_SIZE
];
2280 dprintk(KERN_INFO
"md: ");
2281 if (rdev
->sb_loaded
!= 1)
2282 continue; /* no noise on spare devices */
2283 if (test_bit(Faulty
, &rdev
->flags
))
2284 dprintk("(skipping faulty ");
2286 dprintk("%s ", bdevname(rdev
->bdev
,b
));
2287 if (!test_bit(Faulty
, &rdev
->flags
)) {
2288 md_super_write(mddev
,rdev
,
2289 rdev
->sb_start
, rdev
->sb_size
,
2291 dprintk(KERN_INFO
"(write) %s's sb offset: %llu\n",
2292 bdevname(rdev
->bdev
,b
),
2293 (unsigned long long)rdev
->sb_start
);
2294 rdev
->sb_events
= mddev
->events
;
2298 if (mddev
->level
== LEVEL_MULTIPATH
)
2299 /* only need to write one superblock... */
2302 md_super_wait(mddev
);
2303 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2305 spin_lock_irq(&mddev
->write_lock
);
2306 if (mddev
->in_sync
!= sync_req
||
2307 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2308 /* have to write it out again */
2309 spin_unlock_irq(&mddev
->write_lock
);
2312 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2313 spin_unlock_irq(&mddev
->write_lock
);
2314 wake_up(&mddev
->sb_wait
);
2315 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2316 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2320 /* words written to sysfs files may, or may not, be \n terminated.
2321 * We want to accept with case. For this we use cmd_match.
2323 static int cmd_match(const char *cmd
, const char *str
)
2325 /* See if cmd, written into a sysfs file, matches
2326 * str. They must either be the same, or cmd can
2327 * have a trailing newline
2329 while (*cmd
&& *str
&& *cmd
== *str
) {
2340 struct rdev_sysfs_entry
{
2341 struct attribute attr
;
2342 ssize_t (*show
)(mdk_rdev_t
*, char *);
2343 ssize_t (*store
)(mdk_rdev_t
*, const char *, size_t);
2347 state_show(mdk_rdev_t
*rdev
, char *page
)
2352 if (test_bit(Faulty
, &rdev
->flags
)) {
2353 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2356 if (test_bit(In_sync
, &rdev
->flags
)) {
2357 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2360 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2361 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2364 if (test_bit(Blocked
, &rdev
->flags
)) {
2365 len
+= sprintf(page
+len
, "%sblocked", sep
);
2368 if (!test_bit(Faulty
, &rdev
->flags
) &&
2369 !test_bit(In_sync
, &rdev
->flags
)) {
2370 len
+= sprintf(page
+len
, "%sspare", sep
);
2373 return len
+sprintf(page
+len
, "\n");
2377 state_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2380 * faulty - simulates and error
2381 * remove - disconnects the device
2382 * writemostly - sets write_mostly
2383 * -writemostly - clears write_mostly
2384 * blocked - sets the Blocked flag
2385 * -blocked - clears the Blocked flag
2386 * insync - sets Insync providing device isn't active
2389 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2390 md_error(rdev
->mddev
, rdev
);
2392 } else if (cmd_match(buf
, "remove")) {
2393 if (rdev
->raid_disk
>= 0)
2396 mddev_t
*mddev
= rdev
->mddev
;
2397 kick_rdev_from_array(rdev
);
2399 md_update_sb(mddev
, 1);
2400 md_new_event(mddev
);
2403 } else if (cmd_match(buf
, "writemostly")) {
2404 set_bit(WriteMostly
, &rdev
->flags
);
2406 } else if (cmd_match(buf
, "-writemostly")) {
2407 clear_bit(WriteMostly
, &rdev
->flags
);
2409 } else if (cmd_match(buf
, "blocked")) {
2410 set_bit(Blocked
, &rdev
->flags
);
2412 } else if (cmd_match(buf
, "-blocked")) {
2413 clear_bit(Blocked
, &rdev
->flags
);
2414 wake_up(&rdev
->blocked_wait
);
2415 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2416 md_wakeup_thread(rdev
->mddev
->thread
);
2419 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2420 set_bit(In_sync
, &rdev
->flags
);
2424 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2425 return err
? err
: len
;
2427 static struct rdev_sysfs_entry rdev_state
=
2428 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2431 errors_show(mdk_rdev_t
*rdev
, char *page
)
2433 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2437 errors_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2440 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2441 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2442 atomic_set(&rdev
->corrected_errors
, n
);
2447 static struct rdev_sysfs_entry rdev_errors
=
2448 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2451 slot_show(mdk_rdev_t
*rdev
, char *page
)
2453 if (rdev
->raid_disk
< 0)
2454 return sprintf(page
, "none\n");
2456 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2460 slot_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2464 int slot
= simple_strtoul(buf
, &e
, 10);
2465 if (strncmp(buf
, "none", 4)==0)
2467 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2469 if (rdev
->mddev
->pers
&& slot
== -1) {
2470 /* Setting 'slot' on an active array requires also
2471 * updating the 'rd%d' link, and communicating
2472 * with the personality with ->hot_*_disk.
2473 * For now we only support removing
2474 * failed/spare devices. This normally happens automatically,
2475 * but not when the metadata is externally managed.
2477 if (rdev
->raid_disk
== -1)
2479 /* personality does all needed checks */
2480 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2482 err
= rdev
->mddev
->pers
->
2483 hot_remove_disk(rdev
->mddev
, rdev
->raid_disk
);
2486 sysfs_unlink_rdev(rdev
->mddev
, rdev
);
2487 rdev
->raid_disk
= -1;
2488 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2489 md_wakeup_thread(rdev
->mddev
->thread
);
2490 } else if (rdev
->mddev
->pers
) {
2492 /* Activating a spare .. or possibly reactivating
2493 * if we ever get bitmaps working here.
2496 if (rdev
->raid_disk
!= -1)
2499 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2502 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2505 list_for_each_entry(rdev2
, &rdev
->mddev
->disks
, same_set
)
2506 if (rdev2
->raid_disk
== slot
)
2509 if (slot
>= rdev
->mddev
->raid_disks
&&
2510 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2513 rdev
->raid_disk
= slot
;
2514 if (test_bit(In_sync
, &rdev
->flags
))
2515 rdev
->saved_raid_disk
= slot
;
2517 rdev
->saved_raid_disk
= -1;
2518 err
= rdev
->mddev
->pers
->
2519 hot_add_disk(rdev
->mddev
, rdev
);
2521 rdev
->raid_disk
= -1;
2524 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2525 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2526 /* failure here is OK */;
2527 /* don't wakeup anyone, leave that to userspace. */
2529 if (slot
>= rdev
->mddev
->raid_disks
&&
2530 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2532 rdev
->raid_disk
= slot
;
2533 /* assume it is working */
2534 clear_bit(Faulty
, &rdev
->flags
);
2535 clear_bit(WriteMostly
, &rdev
->flags
);
2536 set_bit(In_sync
, &rdev
->flags
);
2537 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2543 static struct rdev_sysfs_entry rdev_slot
=
2544 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2547 offset_show(mdk_rdev_t
*rdev
, char *page
)
2549 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2553 offset_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2556 unsigned long long offset
= simple_strtoull(buf
, &e
, 10);
2557 if (e
==buf
|| (*e
&& *e
!= '\n'))
2559 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2561 if (rdev
->sectors
&& rdev
->mddev
->external
)
2562 /* Must set offset before size, so overlap checks
2565 rdev
->data_offset
= offset
;
2569 static struct rdev_sysfs_entry rdev_offset
=
2570 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2573 rdev_size_show(mdk_rdev_t
*rdev
, char *page
)
2575 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2578 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2580 /* check if two start/length pairs overlap */
2588 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2590 unsigned long long blocks
;
2593 if (strict_strtoull(buf
, 10, &blocks
) < 0)
2596 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2597 return -EINVAL
; /* sector conversion overflow */
2600 if (new != blocks
* 2)
2601 return -EINVAL
; /* unsigned long long to sector_t overflow */
2608 rdev_size_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2610 mddev_t
*my_mddev
= rdev
->mddev
;
2611 sector_t oldsectors
= rdev
->sectors
;
2614 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2616 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2617 if (my_mddev
->persistent
) {
2618 sectors
= super_types
[my_mddev
->major_version
].
2619 rdev_size_change(rdev
, sectors
);
2622 } else if (!sectors
)
2623 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2626 if (sectors
< my_mddev
->dev_sectors
)
2627 return -EINVAL
; /* component must fit device */
2629 rdev
->sectors
= sectors
;
2630 if (sectors
> oldsectors
&& my_mddev
->external
) {
2631 /* need to check that all other rdevs with the same ->bdev
2632 * do not overlap. We need to unlock the mddev to avoid
2633 * a deadlock. We have already changed rdev->sectors, and if
2634 * we have to change it back, we will have the lock again.
2638 struct list_head
*tmp
;
2640 mddev_unlock(my_mddev
);
2641 for_each_mddev(mddev
, tmp
) {
2645 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
)
2646 if (rdev
->bdev
== rdev2
->bdev
&&
2648 overlaps(rdev
->data_offset
, rdev
->sectors
,
2654 mddev_unlock(mddev
);
2660 mddev_lock(my_mddev
);
2662 /* Someone else could have slipped in a size
2663 * change here, but doing so is just silly.
2664 * We put oldsectors back because we *know* it is
2665 * safe, and trust userspace not to race with
2668 rdev
->sectors
= oldsectors
;
2675 static struct rdev_sysfs_entry rdev_size
=
2676 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
2679 static ssize_t
recovery_start_show(mdk_rdev_t
*rdev
, char *page
)
2681 unsigned long long recovery_start
= rdev
->recovery_offset
;
2683 if (test_bit(In_sync
, &rdev
->flags
) ||
2684 recovery_start
== MaxSector
)
2685 return sprintf(page
, "none\n");
2687 return sprintf(page
, "%llu\n", recovery_start
);
2690 static ssize_t
recovery_start_store(mdk_rdev_t
*rdev
, const char *buf
, size_t len
)
2692 unsigned long long recovery_start
;
2694 if (cmd_match(buf
, "none"))
2695 recovery_start
= MaxSector
;
2696 else if (strict_strtoull(buf
, 10, &recovery_start
))
2699 if (rdev
->mddev
->pers
&&
2700 rdev
->raid_disk
>= 0)
2703 rdev
->recovery_offset
= recovery_start
;
2704 if (recovery_start
== MaxSector
)
2705 set_bit(In_sync
, &rdev
->flags
);
2707 clear_bit(In_sync
, &rdev
->flags
);
2711 static struct rdev_sysfs_entry rdev_recovery_start
=
2712 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
2714 static struct attribute
*rdev_default_attrs
[] = {
2720 &rdev_recovery_start
.attr
,
2724 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
2726 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2727 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2728 mddev_t
*mddev
= rdev
->mddev
;
2734 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
2736 if (rdev
->mddev
== NULL
)
2739 rv
= entry
->show(rdev
, page
);
2740 mddev_unlock(mddev
);
2746 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
2747 const char *page
, size_t length
)
2749 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
2750 mdk_rdev_t
*rdev
= container_of(kobj
, mdk_rdev_t
, kobj
);
2752 mddev_t
*mddev
= rdev
->mddev
;
2756 if (!capable(CAP_SYS_ADMIN
))
2758 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
2760 if (rdev
->mddev
== NULL
)
2763 rv
= entry
->store(rdev
, page
, length
);
2764 mddev_unlock(mddev
);
2769 static void rdev_free(struct kobject
*ko
)
2771 mdk_rdev_t
*rdev
= container_of(ko
, mdk_rdev_t
, kobj
);
2774 static const struct sysfs_ops rdev_sysfs_ops
= {
2775 .show
= rdev_attr_show
,
2776 .store
= rdev_attr_store
,
2778 static struct kobj_type rdev_ktype
= {
2779 .release
= rdev_free
,
2780 .sysfs_ops
= &rdev_sysfs_ops
,
2781 .default_attrs
= rdev_default_attrs
,
2784 int md_rdev_init(mdk_rdev_t
*rdev
)
2787 rdev
->saved_raid_disk
= -1;
2788 rdev
->raid_disk
= -1;
2790 rdev
->data_offset
= 0;
2791 rdev
->sb_events
= 0;
2792 rdev
->last_read_error
.tv_sec
= 0;
2793 rdev
->last_read_error
.tv_nsec
= 0;
2794 atomic_set(&rdev
->nr_pending
, 0);
2795 atomic_set(&rdev
->read_errors
, 0);
2796 atomic_set(&rdev
->corrected_errors
, 0);
2798 INIT_LIST_HEAD(&rdev
->same_set
);
2799 init_waitqueue_head(&rdev
->blocked_wait
);
2801 /* Add space to store bad block list.
2802 * This reserves the space even on arrays where it cannot
2803 * be used - I wonder if that matters
2805 rdev
->badblocks
.count
= 0;
2806 rdev
->badblocks
.shift
= 0;
2807 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
2808 seqlock_init(&rdev
->badblocks
.lock
);
2809 if (rdev
->badblocks
.page
== NULL
)
2814 EXPORT_SYMBOL_GPL(md_rdev_init
);
2816 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2818 * mark the device faulty if:
2820 * - the device is nonexistent (zero size)
2821 * - the device has no valid superblock
2823 * a faulty rdev _never_ has rdev->sb set.
2825 static mdk_rdev_t
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
2827 char b
[BDEVNAME_SIZE
];
2832 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
2834 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
2835 return ERR_PTR(-ENOMEM
);
2838 err
= md_rdev_init(rdev
);
2841 err
= alloc_disk_sb(rdev
);
2845 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
2849 kobject_init(&rdev
->kobj
, &rdev_ktype
);
2851 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
2854 "md: %s has zero or unknown size, marking faulty!\n",
2855 bdevname(rdev
->bdev
,b
));
2860 if (super_format
>= 0) {
2861 err
= super_types
[super_format
].
2862 load_super(rdev
, NULL
, super_minor
);
2863 if (err
== -EINVAL
) {
2865 "md: %s does not have a valid v%d.%d "
2866 "superblock, not importing!\n",
2867 bdevname(rdev
->bdev
,b
),
2868 super_format
, super_minor
);
2873 "md: could not read %s's sb, not importing!\n",
2874 bdevname(rdev
->bdev
,b
));
2882 if (rdev
->sb_page
) {
2887 kfree(rdev
->badblocks
.page
);
2889 return ERR_PTR(err
);
2893 * Check a full RAID array for plausibility
2897 static void analyze_sbs(mddev_t
* mddev
)
2900 mdk_rdev_t
*rdev
, *freshest
, *tmp
;
2901 char b
[BDEVNAME_SIZE
];
2904 rdev_for_each(rdev
, tmp
, mddev
)
2905 switch (super_types
[mddev
->major_version
].
2906 load_super(rdev
, freshest
, mddev
->minor_version
)) {
2914 "md: fatal superblock inconsistency in %s"
2915 " -- removing from array\n",
2916 bdevname(rdev
->bdev
,b
));
2917 kick_rdev_from_array(rdev
);
2921 super_types
[mddev
->major_version
].
2922 validate_super(mddev
, freshest
);
2925 rdev_for_each(rdev
, tmp
, mddev
) {
2926 if (mddev
->max_disks
&&
2927 (rdev
->desc_nr
>= mddev
->max_disks
||
2928 i
> mddev
->max_disks
)) {
2930 "md: %s: %s: only %d devices permitted\n",
2931 mdname(mddev
), bdevname(rdev
->bdev
, b
),
2933 kick_rdev_from_array(rdev
);
2936 if (rdev
!= freshest
)
2937 if (super_types
[mddev
->major_version
].
2938 validate_super(mddev
, rdev
)) {
2939 printk(KERN_WARNING
"md: kicking non-fresh %s"
2941 bdevname(rdev
->bdev
,b
));
2942 kick_rdev_from_array(rdev
);
2945 if (mddev
->level
== LEVEL_MULTIPATH
) {
2946 rdev
->desc_nr
= i
++;
2947 rdev
->raid_disk
= rdev
->desc_nr
;
2948 set_bit(In_sync
, &rdev
->flags
);
2949 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
2950 rdev
->raid_disk
= -1;
2951 clear_bit(In_sync
, &rdev
->flags
);
2956 /* Read a fixed-point number.
2957 * Numbers in sysfs attributes should be in "standard" units where
2958 * possible, so time should be in seconds.
2959 * However we internally use a a much smaller unit such as
2960 * milliseconds or jiffies.
2961 * This function takes a decimal number with a possible fractional
2962 * component, and produces an integer which is the result of
2963 * multiplying that number by 10^'scale'.
2964 * all without any floating-point arithmetic.
2966 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
2968 unsigned long result
= 0;
2970 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
2973 else if (decimals
< scale
) {
2976 result
= result
* 10 + value
;
2988 while (decimals
< scale
) {
2997 static void md_safemode_timeout(unsigned long data
);
3000 safe_delay_show(mddev_t
*mddev
, char *page
)
3002 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3003 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3006 safe_delay_store(mddev_t
*mddev
, const char *cbuf
, size_t len
)
3010 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3013 mddev
->safemode_delay
= 0;
3015 unsigned long old_delay
= mddev
->safemode_delay
;
3016 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3017 if (mddev
->safemode_delay
== 0)
3018 mddev
->safemode_delay
= 1;
3019 if (mddev
->safemode_delay
< old_delay
)
3020 md_safemode_timeout((unsigned long)mddev
);
3024 static struct md_sysfs_entry md_safe_delay
=
3025 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3028 level_show(mddev_t
*mddev
, char *page
)
3030 struct mdk_personality
*p
= mddev
->pers
;
3032 return sprintf(page
, "%s\n", p
->name
);
3033 else if (mddev
->clevel
[0])
3034 return sprintf(page
, "%s\n", mddev
->clevel
);
3035 else if (mddev
->level
!= LEVEL_NONE
)
3036 return sprintf(page
, "%d\n", mddev
->level
);
3042 level_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3046 struct mdk_personality
*pers
;
3051 if (mddev
->pers
== NULL
) {
3054 if (len
>= sizeof(mddev
->clevel
))
3056 strncpy(mddev
->clevel
, buf
, len
);
3057 if (mddev
->clevel
[len
-1] == '\n')
3059 mddev
->clevel
[len
] = 0;
3060 mddev
->level
= LEVEL_NONE
;
3064 /* request to change the personality. Need to ensure:
3065 * - array is not engaged in resync/recovery/reshape
3066 * - old personality can be suspended
3067 * - new personality will access other array.
3070 if (mddev
->sync_thread
||
3071 mddev
->reshape_position
!= MaxSector
||
3072 mddev
->sysfs_active
)
3075 if (!mddev
->pers
->quiesce
) {
3076 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3077 mdname(mddev
), mddev
->pers
->name
);
3081 /* Now find the new personality */
3082 if (len
== 0 || len
>= sizeof(clevel
))
3084 strncpy(clevel
, buf
, len
);
3085 if (clevel
[len
-1] == '\n')
3088 if (strict_strtol(clevel
, 10, &level
))
3091 if (request_module("md-%s", clevel
) != 0)
3092 request_module("md-level-%s", clevel
);
3093 spin_lock(&pers_lock
);
3094 pers
= find_pers(level
, clevel
);
3095 if (!pers
|| !try_module_get(pers
->owner
)) {
3096 spin_unlock(&pers_lock
);
3097 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3100 spin_unlock(&pers_lock
);
3102 if (pers
== mddev
->pers
) {
3103 /* Nothing to do! */
3104 module_put(pers
->owner
);
3107 if (!pers
->takeover
) {
3108 module_put(pers
->owner
);
3109 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3110 mdname(mddev
), clevel
);
3114 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
3115 rdev
->new_raid_disk
= rdev
->raid_disk
;
3117 /* ->takeover must set new_* and/or delta_disks
3118 * if it succeeds, and may set them when it fails.
3120 priv
= pers
->takeover(mddev
);
3122 mddev
->new_level
= mddev
->level
;
3123 mddev
->new_layout
= mddev
->layout
;
3124 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3125 mddev
->raid_disks
-= mddev
->delta_disks
;
3126 mddev
->delta_disks
= 0;
3127 module_put(pers
->owner
);
3128 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3129 mdname(mddev
), clevel
);
3130 return PTR_ERR(priv
);
3133 /* Looks like we have a winner */
3134 mddev_suspend(mddev
);
3135 mddev
->pers
->stop(mddev
);
3137 if (mddev
->pers
->sync_request
== NULL
&&
3138 pers
->sync_request
!= NULL
) {
3139 /* need to add the md_redundancy_group */
3140 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3142 "md: cannot register extra attributes for %s\n",
3144 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, NULL
, "sync_action");
3146 if (mddev
->pers
->sync_request
!= NULL
&&
3147 pers
->sync_request
== NULL
) {
3148 /* need to remove the md_redundancy_group */
3149 if (mddev
->to_remove
== NULL
)
3150 mddev
->to_remove
= &md_redundancy_group
;
3153 if (mddev
->pers
->sync_request
== NULL
&&
3155 /* We are converting from a no-redundancy array
3156 * to a redundancy array and metadata is managed
3157 * externally so we need to be sure that writes
3158 * won't block due to a need to transition
3160 * until external management is started.
3163 mddev
->safemode_delay
= 0;
3164 mddev
->safemode
= 0;
3167 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3168 if (rdev
->raid_disk
< 0)
3170 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3171 rdev
->new_raid_disk
= -1;
3172 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3174 sysfs_unlink_rdev(mddev
, rdev
);
3176 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
3177 if (rdev
->raid_disk
< 0)
3179 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3181 rdev
->raid_disk
= rdev
->new_raid_disk
;
3182 if (rdev
->raid_disk
< 0)
3183 clear_bit(In_sync
, &rdev
->flags
);
3185 if (sysfs_link_rdev(mddev
, rdev
))
3186 printk(KERN_WARNING
"md: cannot register rd%d"
3187 " for %s after level change\n",
3188 rdev
->raid_disk
, mdname(mddev
));
3192 module_put(mddev
->pers
->owner
);
3194 mddev
->private = priv
;
3195 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3196 mddev
->level
= mddev
->new_level
;
3197 mddev
->layout
= mddev
->new_layout
;
3198 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3199 mddev
->delta_disks
= 0;
3200 mddev
->degraded
= 0;
3201 if (mddev
->pers
->sync_request
== NULL
) {
3202 /* this is now an array without redundancy, so
3203 * it must always be in_sync
3206 del_timer_sync(&mddev
->safemode_timer
);
3209 mddev_resume(mddev
);
3210 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3211 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3212 md_wakeup_thread(mddev
->thread
);
3213 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3214 md_new_event(mddev
);
3218 static struct md_sysfs_entry md_level
=
3219 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3223 layout_show(mddev_t
*mddev
, char *page
)
3225 /* just a number, not meaningful for all levels */
3226 if (mddev
->reshape_position
!= MaxSector
&&
3227 mddev
->layout
!= mddev
->new_layout
)
3228 return sprintf(page
, "%d (%d)\n",
3229 mddev
->new_layout
, mddev
->layout
);
3230 return sprintf(page
, "%d\n", mddev
->layout
);
3234 layout_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3237 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3239 if (!*buf
|| (*e
&& *e
!= '\n'))
3244 if (mddev
->pers
->check_reshape
== NULL
)
3246 mddev
->new_layout
= n
;
3247 err
= mddev
->pers
->check_reshape(mddev
);
3249 mddev
->new_layout
= mddev
->layout
;
3253 mddev
->new_layout
= n
;
3254 if (mddev
->reshape_position
== MaxSector
)
3259 static struct md_sysfs_entry md_layout
=
3260 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3264 raid_disks_show(mddev_t
*mddev
, char *page
)
3266 if (mddev
->raid_disks
== 0)
3268 if (mddev
->reshape_position
!= MaxSector
&&
3269 mddev
->delta_disks
!= 0)
3270 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3271 mddev
->raid_disks
- mddev
->delta_disks
);
3272 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3275 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
);
3278 raid_disks_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3282 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3284 if (!*buf
|| (*e
&& *e
!= '\n'))
3288 rv
= update_raid_disks(mddev
, n
);
3289 else if (mddev
->reshape_position
!= MaxSector
) {
3290 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3291 mddev
->delta_disks
= n
- olddisks
;
3292 mddev
->raid_disks
= n
;
3294 mddev
->raid_disks
= n
;
3295 return rv
? rv
: len
;
3297 static struct md_sysfs_entry md_raid_disks
=
3298 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3301 chunk_size_show(mddev_t
*mddev
, char *page
)
3303 if (mddev
->reshape_position
!= MaxSector
&&
3304 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3305 return sprintf(page
, "%d (%d)\n",
3306 mddev
->new_chunk_sectors
<< 9,
3307 mddev
->chunk_sectors
<< 9);
3308 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3312 chunk_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3315 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3317 if (!*buf
|| (*e
&& *e
!= '\n'))
3322 if (mddev
->pers
->check_reshape
== NULL
)
3324 mddev
->new_chunk_sectors
= n
>> 9;
3325 err
= mddev
->pers
->check_reshape(mddev
);
3327 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3331 mddev
->new_chunk_sectors
= n
>> 9;
3332 if (mddev
->reshape_position
== MaxSector
)
3333 mddev
->chunk_sectors
= n
>> 9;
3337 static struct md_sysfs_entry md_chunk_size
=
3338 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3341 resync_start_show(mddev_t
*mddev
, char *page
)
3343 if (mddev
->recovery_cp
== MaxSector
)
3344 return sprintf(page
, "none\n");
3345 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3349 resync_start_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3352 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3354 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3356 if (cmd_match(buf
, "none"))
3358 else if (!*buf
|| (*e
&& *e
!= '\n'))
3361 mddev
->recovery_cp
= n
;
3364 static struct md_sysfs_entry md_resync_start
=
3365 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3368 * The array state can be:
3371 * No devices, no size, no level
3372 * Equivalent to STOP_ARRAY ioctl
3374 * May have some settings, but array is not active
3375 * all IO results in error
3376 * When written, doesn't tear down array, but just stops it
3377 * suspended (not supported yet)
3378 * All IO requests will block. The array can be reconfigured.
3379 * Writing this, if accepted, will block until array is quiescent
3381 * no resync can happen. no superblocks get written.
3382 * write requests fail
3384 * like readonly, but behaves like 'clean' on a write request.
3386 * clean - no pending writes, but otherwise active.
3387 * When written to inactive array, starts without resync
3388 * If a write request arrives then
3389 * if metadata is known, mark 'dirty' and switch to 'active'.
3390 * if not known, block and switch to write-pending
3391 * If written to an active array that has pending writes, then fails.
3393 * fully active: IO and resync can be happening.
3394 * When written to inactive array, starts with resync
3397 * clean, but writes are blocked waiting for 'active' to be written.
3400 * like active, but no writes have been seen for a while (100msec).
3403 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3404 write_pending
, active_idle
, bad_word
};
3405 static char *array_states
[] = {
3406 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3407 "write-pending", "active-idle", NULL
};
3409 static int match_word(const char *word
, char **list
)
3412 for (n
=0; list
[n
]; n
++)
3413 if (cmd_match(word
, list
[n
]))
3419 array_state_show(mddev_t
*mddev
, char *page
)
3421 enum array_state st
= inactive
;
3434 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3436 else if (mddev
->safemode
)
3442 if (list_empty(&mddev
->disks
) &&
3443 mddev
->raid_disks
== 0 &&
3444 mddev
->dev_sectors
== 0)
3449 return sprintf(page
, "%s\n", array_states
[st
]);
3452 static int do_md_stop(mddev_t
* mddev
, int ro
, int is_open
);
3453 static int md_set_readonly(mddev_t
* mddev
, int is_open
);
3454 static int do_md_run(mddev_t
* mddev
);
3455 static int restart_array(mddev_t
*mddev
);
3458 array_state_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3461 enum array_state st
= match_word(buf
, array_states
);
3466 /* stopping an active array */
3467 if (atomic_read(&mddev
->openers
) > 0)
3469 err
= do_md_stop(mddev
, 0, 0);
3472 /* stopping an active array */
3474 if (atomic_read(&mddev
->openers
) > 0)
3476 err
= do_md_stop(mddev
, 2, 0);
3478 err
= 0; /* already inactive */
3481 break; /* not supported yet */
3484 err
= md_set_readonly(mddev
, 0);
3487 set_disk_ro(mddev
->gendisk
, 1);
3488 err
= do_md_run(mddev
);
3494 err
= md_set_readonly(mddev
, 0);
3495 else if (mddev
->ro
== 1)
3496 err
= restart_array(mddev
);
3499 set_disk_ro(mddev
->gendisk
, 0);
3503 err
= do_md_run(mddev
);
3508 restart_array(mddev
);
3509 spin_lock_irq(&mddev
->write_lock
);
3510 if (atomic_read(&mddev
->writes_pending
) == 0) {
3511 if (mddev
->in_sync
== 0) {
3513 if (mddev
->safemode
== 1)
3514 mddev
->safemode
= 0;
3515 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3520 spin_unlock_irq(&mddev
->write_lock
);
3526 restart_array(mddev
);
3527 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3528 wake_up(&mddev
->sb_wait
);
3532 set_disk_ro(mddev
->gendisk
, 0);
3533 err
= do_md_run(mddev
);
3538 /* these cannot be set */
3544 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3548 static struct md_sysfs_entry md_array_state
=
3549 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3552 max_corrected_read_errors_show(mddev_t
*mddev
, char *page
) {
3553 return sprintf(page
, "%d\n",
3554 atomic_read(&mddev
->max_corr_read_errors
));
3558 max_corrected_read_errors_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3561 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3563 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3564 atomic_set(&mddev
->max_corr_read_errors
, n
);
3570 static struct md_sysfs_entry max_corr_read_errors
=
3571 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3572 max_corrected_read_errors_store
);
3575 null_show(mddev_t
*mddev
, char *page
)
3581 new_dev_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3583 /* buf must be %d:%d\n? giving major and minor numbers */
3584 /* The new device is added to the array.
3585 * If the array has a persistent superblock, we read the
3586 * superblock to initialise info and check validity.
3587 * Otherwise, only checking done is that in bind_rdev_to_array,
3588 * which mainly checks size.
3591 int major
= simple_strtoul(buf
, &e
, 10);
3597 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3599 minor
= simple_strtoul(e
+1, &e
, 10);
3600 if (*e
&& *e
!= '\n')
3602 dev
= MKDEV(major
, minor
);
3603 if (major
!= MAJOR(dev
) ||
3604 minor
!= MINOR(dev
))
3608 if (mddev
->persistent
) {
3609 rdev
= md_import_device(dev
, mddev
->major_version
,
3610 mddev
->minor_version
);
3611 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3612 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
3613 mdk_rdev_t
, same_set
);
3614 err
= super_types
[mddev
->major_version
]
3615 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3619 } else if (mddev
->external
)
3620 rdev
= md_import_device(dev
, -2, -1);
3622 rdev
= md_import_device(dev
, -1, -1);
3625 return PTR_ERR(rdev
);
3626 err
= bind_rdev_to_array(rdev
, mddev
);
3630 return err
? err
: len
;
3633 static struct md_sysfs_entry md_new_device
=
3634 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
3637 bitmap_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3640 unsigned long chunk
, end_chunk
;
3644 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3646 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
3647 if (buf
== end
) break;
3648 if (*end
== '-') { /* range */
3650 end_chunk
= simple_strtoul(buf
, &end
, 0);
3651 if (buf
== end
) break;
3653 if (*end
&& !isspace(*end
)) break;
3654 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
3655 buf
= skip_spaces(end
);
3657 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
3662 static struct md_sysfs_entry md_bitmap
=
3663 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
3666 size_show(mddev_t
*mddev
, char *page
)
3668 return sprintf(page
, "%llu\n",
3669 (unsigned long long)mddev
->dev_sectors
/ 2);
3672 static int update_size(mddev_t
*mddev
, sector_t num_sectors
);
3675 size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3677 /* If array is inactive, we can reduce the component size, but
3678 * not increase it (except from 0).
3679 * If array is active, we can try an on-line resize
3682 int err
= strict_blocks_to_sectors(buf
, §ors
);
3687 err
= update_size(mddev
, sectors
);
3688 md_update_sb(mddev
, 1);
3690 if (mddev
->dev_sectors
== 0 ||
3691 mddev
->dev_sectors
> sectors
)
3692 mddev
->dev_sectors
= sectors
;
3696 return err
? err
: len
;
3699 static struct md_sysfs_entry md_size
=
3700 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
3705 * 'none' for arrays with no metadata (good luck...)
3706 * 'external' for arrays with externally managed metadata,
3707 * or N.M for internally known formats
3710 metadata_show(mddev_t
*mddev
, char *page
)
3712 if (mddev
->persistent
)
3713 return sprintf(page
, "%d.%d\n",
3714 mddev
->major_version
, mddev
->minor_version
);
3715 else if (mddev
->external
)
3716 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
3718 return sprintf(page
, "none\n");
3722 metadata_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3726 /* Changing the details of 'external' metadata is
3727 * always permitted. Otherwise there must be
3728 * no devices attached to the array.
3730 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
3732 else if (!list_empty(&mddev
->disks
))
3735 if (cmd_match(buf
, "none")) {
3736 mddev
->persistent
= 0;
3737 mddev
->external
= 0;
3738 mddev
->major_version
= 0;
3739 mddev
->minor_version
= 90;
3742 if (strncmp(buf
, "external:", 9) == 0) {
3743 size_t namelen
= len
-9;
3744 if (namelen
>= sizeof(mddev
->metadata_type
))
3745 namelen
= sizeof(mddev
->metadata_type
)-1;
3746 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
3747 mddev
->metadata_type
[namelen
] = 0;
3748 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
3749 mddev
->metadata_type
[--namelen
] = 0;
3750 mddev
->persistent
= 0;
3751 mddev
->external
= 1;
3752 mddev
->major_version
= 0;
3753 mddev
->minor_version
= 90;
3756 major
= simple_strtoul(buf
, &e
, 10);
3757 if (e
==buf
|| *e
!= '.')
3760 minor
= simple_strtoul(buf
, &e
, 10);
3761 if (e
==buf
|| (*e
&& *e
!= '\n') )
3763 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
3765 mddev
->major_version
= major
;
3766 mddev
->minor_version
= minor
;
3767 mddev
->persistent
= 1;
3768 mddev
->external
= 0;
3772 static struct md_sysfs_entry md_metadata
=
3773 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
3776 action_show(mddev_t
*mddev
, char *page
)
3778 char *type
= "idle";
3779 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3781 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3782 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3783 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3785 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3786 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3788 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3792 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3795 return sprintf(page
, "%s\n", type
);
3798 static void reap_sync_thread(mddev_t
*mddev
);
3801 action_store(mddev_t
*mddev
, const char *page
, size_t len
)
3803 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3806 if (cmd_match(page
, "frozen"))
3807 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3809 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3811 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
3812 if (mddev
->sync_thread
) {
3813 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3814 reap_sync_thread(mddev
);
3816 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3817 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3819 else if (cmd_match(page
, "resync"))
3820 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3821 else if (cmd_match(page
, "recover")) {
3822 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3823 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3824 } else if (cmd_match(page
, "reshape")) {
3826 if (mddev
->pers
->start_reshape
== NULL
)
3828 err
= mddev
->pers
->start_reshape(mddev
);
3831 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
3833 if (cmd_match(page
, "check"))
3834 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3835 else if (!cmd_match(page
, "repair"))
3837 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3838 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3840 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3841 md_wakeup_thread(mddev
->thread
);
3842 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
3847 mismatch_cnt_show(mddev_t
*mddev
, char *page
)
3849 return sprintf(page
, "%llu\n",
3850 (unsigned long long) mddev
->resync_mismatches
);
3853 static struct md_sysfs_entry md_scan_mode
=
3854 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
3857 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
3860 sync_min_show(mddev_t
*mddev
, char *page
)
3862 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
3863 mddev
->sync_speed_min
? "local": "system");
3867 sync_min_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3871 if (strncmp(buf
, "system", 6)==0) {
3872 mddev
->sync_speed_min
= 0;
3875 min
= simple_strtoul(buf
, &e
, 10);
3876 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
3878 mddev
->sync_speed_min
= min
;
3882 static struct md_sysfs_entry md_sync_min
=
3883 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
3886 sync_max_show(mddev_t
*mddev
, char *page
)
3888 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
3889 mddev
->sync_speed_max
? "local": "system");
3893 sync_max_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3897 if (strncmp(buf
, "system", 6)==0) {
3898 mddev
->sync_speed_max
= 0;
3901 max
= simple_strtoul(buf
, &e
, 10);
3902 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
3904 mddev
->sync_speed_max
= max
;
3908 static struct md_sysfs_entry md_sync_max
=
3909 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
3912 degraded_show(mddev_t
*mddev
, char *page
)
3914 return sprintf(page
, "%d\n", mddev
->degraded
);
3916 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
3919 sync_force_parallel_show(mddev_t
*mddev
, char *page
)
3921 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
3925 sync_force_parallel_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3929 if (strict_strtol(buf
, 10, &n
))
3932 if (n
!= 0 && n
!= 1)
3935 mddev
->parallel_resync
= n
;
3937 if (mddev
->sync_thread
)
3938 wake_up(&resync_wait
);
3943 /* force parallel resync, even with shared block devices */
3944 static struct md_sysfs_entry md_sync_force_parallel
=
3945 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
3946 sync_force_parallel_show
, sync_force_parallel_store
);
3949 sync_speed_show(mddev_t
*mddev
, char *page
)
3951 unsigned long resync
, dt
, db
;
3952 if (mddev
->curr_resync
== 0)
3953 return sprintf(page
, "none\n");
3954 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
3955 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
3957 db
= resync
- mddev
->resync_mark_cnt
;
3958 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
3961 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
3964 sync_completed_show(mddev_t
*mddev
, char *page
)
3966 unsigned long long max_sectors
, resync
;
3968 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3969 return sprintf(page
, "none\n");
3971 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
3972 max_sectors
= mddev
->resync_max_sectors
;
3974 max_sectors
= mddev
->dev_sectors
;
3976 resync
= mddev
->curr_resync_completed
;
3977 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
3980 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
3983 min_sync_show(mddev_t
*mddev
, char *page
)
3985 return sprintf(page
, "%llu\n",
3986 (unsigned long long)mddev
->resync_min
);
3989 min_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
3991 unsigned long long min
;
3992 if (strict_strtoull(buf
, 10, &min
))
3994 if (min
> mddev
->resync_max
)
3996 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3999 /* Must be a multiple of chunk_size */
4000 if (mddev
->chunk_sectors
) {
4001 sector_t temp
= min
;
4002 if (sector_div(temp
, mddev
->chunk_sectors
))
4005 mddev
->resync_min
= min
;
4010 static struct md_sysfs_entry md_min_sync
=
4011 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4014 max_sync_show(mddev_t
*mddev
, char *page
)
4016 if (mddev
->resync_max
== MaxSector
)
4017 return sprintf(page
, "max\n");
4019 return sprintf(page
, "%llu\n",
4020 (unsigned long long)mddev
->resync_max
);
4023 max_sync_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4025 if (strncmp(buf
, "max", 3) == 0)
4026 mddev
->resync_max
= MaxSector
;
4028 unsigned long long max
;
4029 if (strict_strtoull(buf
, 10, &max
))
4031 if (max
< mddev
->resync_min
)
4033 if (max
< mddev
->resync_max
&&
4035 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4038 /* Must be a multiple of chunk_size */
4039 if (mddev
->chunk_sectors
) {
4040 sector_t temp
= max
;
4041 if (sector_div(temp
, mddev
->chunk_sectors
))
4044 mddev
->resync_max
= max
;
4046 wake_up(&mddev
->recovery_wait
);
4050 static struct md_sysfs_entry md_max_sync
=
4051 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4054 suspend_lo_show(mddev_t
*mddev
, char *page
)
4056 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4060 suspend_lo_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4063 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4064 unsigned long long old
= mddev
->suspend_lo
;
4066 if (mddev
->pers
== NULL
||
4067 mddev
->pers
->quiesce
== NULL
)
4069 if (buf
== e
|| (*e
&& *e
!= '\n'))
4072 mddev
->suspend_lo
= new;
4074 /* Shrinking suspended region */
4075 mddev
->pers
->quiesce(mddev
, 2);
4077 /* Expanding suspended region - need to wait */
4078 mddev
->pers
->quiesce(mddev
, 1);
4079 mddev
->pers
->quiesce(mddev
, 0);
4083 static struct md_sysfs_entry md_suspend_lo
=
4084 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4088 suspend_hi_show(mddev_t
*mddev
, char *page
)
4090 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4094 suspend_hi_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4097 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4098 unsigned long long old
= mddev
->suspend_hi
;
4100 if (mddev
->pers
== NULL
||
4101 mddev
->pers
->quiesce
== NULL
)
4103 if (buf
== e
|| (*e
&& *e
!= '\n'))
4106 mddev
->suspend_hi
= new;
4108 /* Shrinking suspended region */
4109 mddev
->pers
->quiesce(mddev
, 2);
4111 /* Expanding suspended region - need to wait */
4112 mddev
->pers
->quiesce(mddev
, 1);
4113 mddev
->pers
->quiesce(mddev
, 0);
4117 static struct md_sysfs_entry md_suspend_hi
=
4118 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4121 reshape_position_show(mddev_t
*mddev
, char *page
)
4123 if (mddev
->reshape_position
!= MaxSector
)
4124 return sprintf(page
, "%llu\n",
4125 (unsigned long long)mddev
->reshape_position
);
4126 strcpy(page
, "none\n");
4131 reshape_position_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4134 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4137 if (buf
== e
|| (*e
&& *e
!= '\n'))
4139 mddev
->reshape_position
= new;
4140 mddev
->delta_disks
= 0;
4141 mddev
->new_level
= mddev
->level
;
4142 mddev
->new_layout
= mddev
->layout
;
4143 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4147 static struct md_sysfs_entry md_reshape_position
=
4148 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4149 reshape_position_store
);
4152 array_size_show(mddev_t
*mddev
, char *page
)
4154 if (mddev
->external_size
)
4155 return sprintf(page
, "%llu\n",
4156 (unsigned long long)mddev
->array_sectors
/2);
4158 return sprintf(page
, "default\n");
4162 array_size_store(mddev_t
*mddev
, const char *buf
, size_t len
)
4166 if (strncmp(buf
, "default", 7) == 0) {
4168 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4170 sectors
= mddev
->array_sectors
;
4172 mddev
->external_size
= 0;
4174 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4176 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4179 mddev
->external_size
= 1;
4182 mddev
->array_sectors
= sectors
;
4184 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4185 revalidate_disk(mddev
->gendisk
);
4190 static struct md_sysfs_entry md_array_size
=
4191 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4194 static struct attribute
*md_default_attrs
[] = {
4197 &md_raid_disks
.attr
,
4198 &md_chunk_size
.attr
,
4200 &md_resync_start
.attr
,
4202 &md_new_device
.attr
,
4203 &md_safe_delay
.attr
,
4204 &md_array_state
.attr
,
4205 &md_reshape_position
.attr
,
4206 &md_array_size
.attr
,
4207 &max_corr_read_errors
.attr
,
4211 static struct attribute
*md_redundancy_attrs
[] = {
4213 &md_mismatches
.attr
,
4216 &md_sync_speed
.attr
,
4217 &md_sync_force_parallel
.attr
,
4218 &md_sync_completed
.attr
,
4221 &md_suspend_lo
.attr
,
4222 &md_suspend_hi
.attr
,
4227 static struct attribute_group md_redundancy_group
= {
4229 .attrs
= md_redundancy_attrs
,
4234 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4236 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4237 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4242 rv
= mddev_lock(mddev
);
4244 rv
= entry
->show(mddev
, page
);
4245 mddev_unlock(mddev
);
4251 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4252 const char *page
, size_t length
)
4254 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4255 mddev_t
*mddev
= container_of(kobj
, struct mddev_s
, kobj
);
4260 if (!capable(CAP_SYS_ADMIN
))
4262 rv
= mddev_lock(mddev
);
4263 if (mddev
->hold_active
== UNTIL_IOCTL
)
4264 mddev
->hold_active
= 0;
4266 rv
= entry
->store(mddev
, page
, length
);
4267 mddev_unlock(mddev
);
4272 static void md_free(struct kobject
*ko
)
4274 mddev_t
*mddev
= container_of(ko
, mddev_t
, kobj
);
4276 if (mddev
->sysfs_state
)
4277 sysfs_put(mddev
->sysfs_state
);
4279 if (mddev
->gendisk
) {
4280 del_gendisk(mddev
->gendisk
);
4281 put_disk(mddev
->gendisk
);
4284 blk_cleanup_queue(mddev
->queue
);
4289 static const struct sysfs_ops md_sysfs_ops
= {
4290 .show
= md_attr_show
,
4291 .store
= md_attr_store
,
4293 static struct kobj_type md_ktype
= {
4295 .sysfs_ops
= &md_sysfs_ops
,
4296 .default_attrs
= md_default_attrs
,
4301 static void mddev_delayed_delete(struct work_struct
*ws
)
4303 mddev_t
*mddev
= container_of(ws
, mddev_t
, del_work
);
4305 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4306 kobject_del(&mddev
->kobj
);
4307 kobject_put(&mddev
->kobj
);
4310 static int md_alloc(dev_t dev
, char *name
)
4312 static DEFINE_MUTEX(disks_mutex
);
4313 mddev_t
*mddev
= mddev_find(dev
);
4314 struct gendisk
*disk
;
4323 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4324 shift
= partitioned
? MdpMinorShift
: 0;
4325 unit
= MINOR(mddev
->unit
) >> shift
;
4327 /* wait for any previous instance of this device to be
4328 * completely removed (mddev_delayed_delete).
4330 flush_workqueue(md_misc_wq
);
4332 mutex_lock(&disks_mutex
);
4338 /* Need to ensure that 'name' is not a duplicate.
4341 spin_lock(&all_mddevs_lock
);
4343 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4344 if (mddev2
->gendisk
&&
4345 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4346 spin_unlock(&all_mddevs_lock
);
4349 spin_unlock(&all_mddevs_lock
);
4353 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4356 mddev
->queue
->queuedata
= mddev
;
4358 blk_queue_make_request(mddev
->queue
, md_make_request
);
4360 disk
= alloc_disk(1 << shift
);
4362 blk_cleanup_queue(mddev
->queue
);
4363 mddev
->queue
= NULL
;
4366 disk
->major
= MAJOR(mddev
->unit
);
4367 disk
->first_minor
= unit
<< shift
;
4369 strcpy(disk
->disk_name
, name
);
4370 else if (partitioned
)
4371 sprintf(disk
->disk_name
, "md_d%d", unit
);
4373 sprintf(disk
->disk_name
, "md%d", unit
);
4374 disk
->fops
= &md_fops
;
4375 disk
->private_data
= mddev
;
4376 disk
->queue
= mddev
->queue
;
4377 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4378 /* Allow extended partitions. This makes the
4379 * 'mdp' device redundant, but we can't really
4382 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4383 mddev
->gendisk
= disk
;
4384 /* As soon as we call add_disk(), another thread could get
4385 * through to md_open, so make sure it doesn't get too far
4387 mutex_lock(&mddev
->open_mutex
);
4390 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4391 &disk_to_dev(disk
)->kobj
, "%s", "md");
4393 /* This isn't possible, but as kobject_init_and_add is marked
4394 * __must_check, we must do something with the result
4396 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4400 if (mddev
->kobj
.sd
&&
4401 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4402 printk(KERN_DEBUG
"pointless warning\n");
4403 mutex_unlock(&mddev
->open_mutex
);
4405 mutex_unlock(&disks_mutex
);
4406 if (!error
&& mddev
->kobj
.sd
) {
4407 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4408 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4414 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4416 md_alloc(dev
, NULL
);
4420 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4422 /* val must be "md_*" where * is not all digits.
4423 * We allocate an array with a large free minor number, and
4424 * set the name to val. val must not already be an active name.
4426 int len
= strlen(val
);
4427 char buf
[DISK_NAME_LEN
];
4429 while (len
&& val
[len
-1] == '\n')
4431 if (len
>= DISK_NAME_LEN
)
4433 strlcpy(buf
, val
, len
+1);
4434 if (strncmp(buf
, "md_", 3) != 0)
4436 return md_alloc(0, buf
);
4439 static void md_safemode_timeout(unsigned long data
)
4441 mddev_t
*mddev
= (mddev_t
*) data
;
4443 if (!atomic_read(&mddev
->writes_pending
)) {
4444 mddev
->safemode
= 1;
4445 if (mddev
->external
)
4446 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4448 md_wakeup_thread(mddev
->thread
);
4451 static int start_dirty_degraded
;
4453 int md_run(mddev_t
*mddev
)
4457 struct mdk_personality
*pers
;
4459 if (list_empty(&mddev
->disks
))
4460 /* cannot run an array with no devices.. */
4465 /* Cannot run until previous stop completes properly */
4466 if (mddev
->sysfs_active
)
4470 * Analyze all RAID superblock(s)
4472 if (!mddev
->raid_disks
) {
4473 if (!mddev
->persistent
)
4478 if (mddev
->level
!= LEVEL_NONE
)
4479 request_module("md-level-%d", mddev
->level
);
4480 else if (mddev
->clevel
[0])
4481 request_module("md-%s", mddev
->clevel
);
4484 * Drop all container device buffers, from now on
4485 * the only valid external interface is through the md
4488 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4489 if (test_bit(Faulty
, &rdev
->flags
))
4491 sync_blockdev(rdev
->bdev
);
4492 invalidate_bdev(rdev
->bdev
);
4494 /* perform some consistency tests on the device.
4495 * We don't want the data to overlap the metadata,
4496 * Internal Bitmap issues have been handled elsewhere.
4498 if (rdev
->meta_bdev
) {
4499 /* Nothing to check */;
4500 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4501 if (mddev
->dev_sectors
&&
4502 rdev
->data_offset
+ mddev
->dev_sectors
4504 printk("md: %s: data overlaps metadata\n",
4509 if (rdev
->sb_start
+ rdev
->sb_size
/512
4510 > rdev
->data_offset
) {
4511 printk("md: %s: metadata overlaps data\n",
4516 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4519 if (mddev
->bio_set
== NULL
)
4520 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
,
4523 spin_lock(&pers_lock
);
4524 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4525 if (!pers
|| !try_module_get(pers
->owner
)) {
4526 spin_unlock(&pers_lock
);
4527 if (mddev
->level
!= LEVEL_NONE
)
4528 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4531 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4536 spin_unlock(&pers_lock
);
4537 if (mddev
->level
!= pers
->level
) {
4538 mddev
->level
= pers
->level
;
4539 mddev
->new_level
= pers
->level
;
4541 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4543 if (mddev
->reshape_position
!= MaxSector
&&
4544 pers
->start_reshape
== NULL
) {
4545 /* This personality cannot handle reshaping... */
4547 module_put(pers
->owner
);
4551 if (pers
->sync_request
) {
4552 /* Warn if this is a potentially silly
4555 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
4559 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4560 list_for_each_entry(rdev2
, &mddev
->disks
, same_set
) {
4562 rdev
->bdev
->bd_contains
==
4563 rdev2
->bdev
->bd_contains
) {
4565 "%s: WARNING: %s appears to be"
4566 " on the same physical disk as"
4569 bdevname(rdev
->bdev
,b
),
4570 bdevname(rdev2
->bdev
,b2
));
4577 "True protection against single-disk"
4578 " failure might be compromised.\n");
4581 mddev
->recovery
= 0;
4582 /* may be over-ridden by personality */
4583 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
4585 mddev
->ok_start_degraded
= start_dirty_degraded
;
4587 if (start_readonly
&& mddev
->ro
== 0)
4588 mddev
->ro
= 2; /* read-only, but switch on first write */
4590 err
= mddev
->pers
->run(mddev
);
4592 printk(KERN_ERR
"md: pers->run() failed ...\n");
4593 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
4594 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
4595 " but 'external_size' not in effect?\n", __func__
);
4597 "md: invalid array_size %llu > default size %llu\n",
4598 (unsigned long long)mddev
->array_sectors
/ 2,
4599 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
4601 mddev
->pers
->stop(mddev
);
4603 if (err
== 0 && mddev
->pers
->sync_request
) {
4604 err
= bitmap_create(mddev
);
4606 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
4607 mdname(mddev
), err
);
4608 mddev
->pers
->stop(mddev
);
4612 module_put(mddev
->pers
->owner
);
4614 bitmap_destroy(mddev
);
4617 if (mddev
->pers
->sync_request
) {
4618 if (mddev
->kobj
.sd
&&
4619 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
4621 "md: cannot register extra attributes for %s\n",
4623 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
4624 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
4627 atomic_set(&mddev
->writes_pending
,0);
4628 atomic_set(&mddev
->max_corr_read_errors
,
4629 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
4630 mddev
->safemode
= 0;
4631 mddev
->safemode_timer
.function
= md_safemode_timeout
;
4632 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
4633 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
4637 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4638 if (rdev
->raid_disk
>= 0)
4639 if (sysfs_link_rdev(mddev
, rdev
))
4640 /* failure here is OK */;
4642 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4645 md_update_sb(mddev
, 0);
4647 md_new_event(mddev
);
4648 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4649 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4650 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4653 EXPORT_SYMBOL_GPL(md_run
);
4655 static int do_md_run(mddev_t
*mddev
)
4659 err
= md_run(mddev
);
4662 err
= bitmap_load(mddev
);
4664 bitmap_destroy(mddev
);
4668 md_wakeup_thread(mddev
->thread
);
4669 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
4671 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4672 revalidate_disk(mddev
->gendisk
);
4674 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4679 static int restart_array(mddev_t
*mddev
)
4681 struct gendisk
*disk
= mddev
->gendisk
;
4683 /* Complain if it has no devices */
4684 if (list_empty(&mddev
->disks
))
4690 mddev
->safemode
= 0;
4692 set_disk_ro(disk
, 0);
4693 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
4695 /* Kick recovery or resync if necessary */
4696 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4697 md_wakeup_thread(mddev
->thread
);
4698 md_wakeup_thread(mddev
->sync_thread
);
4699 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4703 /* similar to deny_write_access, but accounts for our holding a reference
4704 * to the file ourselves */
4705 static int deny_bitmap_write_access(struct file
* file
)
4707 struct inode
*inode
= file
->f_mapping
->host
;
4709 spin_lock(&inode
->i_lock
);
4710 if (atomic_read(&inode
->i_writecount
) > 1) {
4711 spin_unlock(&inode
->i_lock
);
4714 atomic_set(&inode
->i_writecount
, -1);
4715 spin_unlock(&inode
->i_lock
);
4720 void restore_bitmap_write_access(struct file
*file
)
4722 struct inode
*inode
= file
->f_mapping
->host
;
4724 spin_lock(&inode
->i_lock
);
4725 atomic_set(&inode
->i_writecount
, 1);
4726 spin_unlock(&inode
->i_lock
);
4729 static void md_clean(mddev_t
*mddev
)
4731 mddev
->array_sectors
= 0;
4732 mddev
->external_size
= 0;
4733 mddev
->dev_sectors
= 0;
4734 mddev
->raid_disks
= 0;
4735 mddev
->recovery_cp
= 0;
4736 mddev
->resync_min
= 0;
4737 mddev
->resync_max
= MaxSector
;
4738 mddev
->reshape_position
= MaxSector
;
4739 mddev
->external
= 0;
4740 mddev
->persistent
= 0;
4741 mddev
->level
= LEVEL_NONE
;
4742 mddev
->clevel
[0] = 0;
4745 mddev
->metadata_type
[0] = 0;
4746 mddev
->chunk_sectors
= 0;
4747 mddev
->ctime
= mddev
->utime
= 0;
4749 mddev
->max_disks
= 0;
4751 mddev
->can_decrease_events
= 0;
4752 mddev
->delta_disks
= 0;
4753 mddev
->new_level
= LEVEL_NONE
;
4754 mddev
->new_layout
= 0;
4755 mddev
->new_chunk_sectors
= 0;
4756 mddev
->curr_resync
= 0;
4757 mddev
->resync_mismatches
= 0;
4758 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
4759 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
4760 mddev
->recovery
= 0;
4763 mddev
->degraded
= 0;
4764 mddev
->safemode
= 0;
4765 mddev
->bitmap_info
.offset
= 0;
4766 mddev
->bitmap_info
.default_offset
= 0;
4767 mddev
->bitmap_info
.chunksize
= 0;
4768 mddev
->bitmap_info
.daemon_sleep
= 0;
4769 mddev
->bitmap_info
.max_write_behind
= 0;
4772 static void __md_stop_writes(mddev_t
*mddev
)
4774 if (mddev
->sync_thread
) {
4775 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4776 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4777 reap_sync_thread(mddev
);
4780 del_timer_sync(&mddev
->safemode_timer
);
4782 bitmap_flush(mddev
);
4783 md_super_wait(mddev
);
4785 if (!mddev
->in_sync
|| mddev
->flags
) {
4786 /* mark array as shutdown cleanly */
4788 md_update_sb(mddev
, 1);
4792 void md_stop_writes(mddev_t
*mddev
)
4795 __md_stop_writes(mddev
);
4796 mddev_unlock(mddev
);
4798 EXPORT_SYMBOL_GPL(md_stop_writes
);
4800 void md_stop(mddev_t
*mddev
)
4803 mddev
->pers
->stop(mddev
);
4804 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
4805 mddev
->to_remove
= &md_redundancy_group
;
4806 module_put(mddev
->pers
->owner
);
4808 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4810 EXPORT_SYMBOL_GPL(md_stop
);
4812 static int md_set_readonly(mddev_t
*mddev
, int is_open
)
4815 mutex_lock(&mddev
->open_mutex
);
4816 if (atomic_read(&mddev
->openers
) > is_open
) {
4817 printk("md: %s still in use.\n",mdname(mddev
));
4822 __md_stop_writes(mddev
);
4828 set_disk_ro(mddev
->gendisk
, 1);
4829 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4830 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4834 mutex_unlock(&mddev
->open_mutex
);
4839 * 0 - completely stop and dis-assemble array
4840 * 2 - stop but do not disassemble array
4842 static int do_md_stop(mddev_t
* mddev
, int mode
, int is_open
)
4844 struct gendisk
*disk
= mddev
->gendisk
;
4847 mutex_lock(&mddev
->open_mutex
);
4848 if (atomic_read(&mddev
->openers
) > is_open
||
4849 mddev
->sysfs_active
) {
4850 printk("md: %s still in use.\n",mdname(mddev
));
4851 mutex_unlock(&mddev
->open_mutex
);
4857 set_disk_ro(disk
, 0);
4859 __md_stop_writes(mddev
);
4861 mddev
->queue
->merge_bvec_fn
= NULL
;
4862 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
4864 /* tell userspace to handle 'inactive' */
4865 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4867 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
4868 if (rdev
->raid_disk
>= 0)
4869 sysfs_unlink_rdev(mddev
, rdev
);
4871 set_capacity(disk
, 0);
4872 mutex_unlock(&mddev
->open_mutex
);
4874 revalidate_disk(disk
);
4879 mutex_unlock(&mddev
->open_mutex
);
4881 * Free resources if final stop
4884 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
4886 bitmap_destroy(mddev
);
4887 if (mddev
->bitmap_info
.file
) {
4888 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
4889 fput(mddev
->bitmap_info
.file
);
4890 mddev
->bitmap_info
.file
= NULL
;
4892 mddev
->bitmap_info
.offset
= 0;
4894 export_array(mddev
);
4897 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
4898 if (mddev
->hold_active
== UNTIL_STOP
)
4899 mddev
->hold_active
= 0;
4901 blk_integrity_unregister(disk
);
4902 md_new_event(mddev
);
4903 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4908 static void autorun_array(mddev_t
*mddev
)
4913 if (list_empty(&mddev
->disks
))
4916 printk(KERN_INFO
"md: running: ");
4918 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
4919 char b
[BDEVNAME_SIZE
];
4920 printk("<%s>", bdevname(rdev
->bdev
,b
));
4924 err
= do_md_run(mddev
);
4926 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
4927 do_md_stop(mddev
, 0, 0);
4932 * lets try to run arrays based on all disks that have arrived
4933 * until now. (those are in pending_raid_disks)
4935 * the method: pick the first pending disk, collect all disks with
4936 * the same UUID, remove all from the pending list and put them into
4937 * the 'same_array' list. Then order this list based on superblock
4938 * update time (freshest comes first), kick out 'old' disks and
4939 * compare superblocks. If everything's fine then run it.
4941 * If "unit" is allocated, then bump its reference count
4943 static void autorun_devices(int part
)
4945 mdk_rdev_t
*rdev0
, *rdev
, *tmp
;
4947 char b
[BDEVNAME_SIZE
];
4949 printk(KERN_INFO
"md: autorun ...\n");
4950 while (!list_empty(&pending_raid_disks
)) {
4953 LIST_HEAD(candidates
);
4954 rdev0
= list_entry(pending_raid_disks
.next
,
4955 mdk_rdev_t
, same_set
);
4957 printk(KERN_INFO
"md: considering %s ...\n",
4958 bdevname(rdev0
->bdev
,b
));
4959 INIT_LIST_HEAD(&candidates
);
4960 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
4961 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
4962 printk(KERN_INFO
"md: adding %s ...\n",
4963 bdevname(rdev
->bdev
,b
));
4964 list_move(&rdev
->same_set
, &candidates
);
4967 * now we have a set of devices, with all of them having
4968 * mostly sane superblocks. It's time to allocate the
4972 dev
= MKDEV(mdp_major
,
4973 rdev0
->preferred_minor
<< MdpMinorShift
);
4974 unit
= MINOR(dev
) >> MdpMinorShift
;
4976 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
4979 if (rdev0
->preferred_minor
!= unit
) {
4980 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
4981 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
4985 md_probe(dev
, NULL
, NULL
);
4986 mddev
= mddev_find(dev
);
4987 if (!mddev
|| !mddev
->gendisk
) {
4991 "md: cannot allocate memory for md drive.\n");
4994 if (mddev_lock(mddev
))
4995 printk(KERN_WARNING
"md: %s locked, cannot run\n",
4997 else if (mddev
->raid_disks
|| mddev
->major_version
4998 || !list_empty(&mddev
->disks
)) {
5000 "md: %s already running, cannot run %s\n",
5001 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5002 mddev_unlock(mddev
);
5004 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5005 mddev
->persistent
= 1;
5006 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5007 list_del_init(&rdev
->same_set
);
5008 if (bind_rdev_to_array(rdev
, mddev
))
5011 autorun_array(mddev
);
5012 mddev_unlock(mddev
);
5014 /* on success, candidates will be empty, on error
5017 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5018 list_del_init(&rdev
->same_set
);
5023 printk(KERN_INFO
"md: ... autorun DONE.\n");
5025 #endif /* !MODULE */
5027 static int get_version(void __user
* arg
)
5031 ver
.major
= MD_MAJOR_VERSION
;
5032 ver
.minor
= MD_MINOR_VERSION
;
5033 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5035 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5041 static int get_array_info(mddev_t
* mddev
, void __user
* arg
)
5043 mdu_array_info_t info
;
5044 int nr
,working
,insync
,failed
,spare
;
5047 nr
=working
=insync
=failed
=spare
=0;
5048 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5050 if (test_bit(Faulty
, &rdev
->flags
))
5054 if (test_bit(In_sync
, &rdev
->flags
))
5061 info
.major_version
= mddev
->major_version
;
5062 info
.minor_version
= mddev
->minor_version
;
5063 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5064 info
.ctime
= mddev
->ctime
;
5065 info
.level
= mddev
->level
;
5066 info
.size
= mddev
->dev_sectors
/ 2;
5067 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5070 info
.raid_disks
= mddev
->raid_disks
;
5071 info
.md_minor
= mddev
->md_minor
;
5072 info
.not_persistent
= !mddev
->persistent
;
5074 info
.utime
= mddev
->utime
;
5077 info
.state
= (1<<MD_SB_CLEAN
);
5078 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5079 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5080 info
.active_disks
= insync
;
5081 info
.working_disks
= working
;
5082 info
.failed_disks
= failed
;
5083 info
.spare_disks
= spare
;
5085 info
.layout
= mddev
->layout
;
5086 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5088 if (copy_to_user(arg
, &info
, sizeof(info
)))
5094 static int get_bitmap_file(mddev_t
* mddev
, void __user
* arg
)
5096 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5097 char *ptr
, *buf
= NULL
;
5100 if (md_allow_write(mddev
))
5101 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5103 file
= kmalloc(sizeof(*file
), GFP_KERNEL
);
5108 /* bitmap disabled, zero the first byte and copy out */
5109 if (!mddev
->bitmap
|| !mddev
->bitmap
->file
) {
5110 file
->pathname
[0] = '\0';
5114 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5118 ptr
= d_path(&mddev
->bitmap
->file
->f_path
, buf
, sizeof(file
->pathname
));
5122 strcpy(file
->pathname
, ptr
);
5126 if (copy_to_user(arg
, file
, sizeof(*file
)))
5134 static int get_disk_info(mddev_t
* mddev
, void __user
* arg
)
5136 mdu_disk_info_t info
;
5139 if (copy_from_user(&info
, arg
, sizeof(info
)))
5142 rdev
= find_rdev_nr(mddev
, info
.number
);
5144 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5145 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5146 info
.raid_disk
= rdev
->raid_disk
;
5148 if (test_bit(Faulty
, &rdev
->flags
))
5149 info
.state
|= (1<<MD_DISK_FAULTY
);
5150 else if (test_bit(In_sync
, &rdev
->flags
)) {
5151 info
.state
|= (1<<MD_DISK_ACTIVE
);
5152 info
.state
|= (1<<MD_DISK_SYNC
);
5154 if (test_bit(WriteMostly
, &rdev
->flags
))
5155 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5157 info
.major
= info
.minor
= 0;
5158 info
.raid_disk
= -1;
5159 info
.state
= (1<<MD_DISK_REMOVED
);
5162 if (copy_to_user(arg
, &info
, sizeof(info
)))
5168 static int add_new_disk(mddev_t
* mddev
, mdu_disk_info_t
*info
)
5170 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5172 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5174 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5177 if (!mddev
->raid_disks
) {
5179 /* expecting a device which has a superblock */
5180 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5183 "md: md_import_device returned %ld\n",
5185 return PTR_ERR(rdev
);
5187 if (!list_empty(&mddev
->disks
)) {
5188 mdk_rdev_t
*rdev0
= list_entry(mddev
->disks
.next
,
5189 mdk_rdev_t
, same_set
);
5190 err
= super_types
[mddev
->major_version
]
5191 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5194 "md: %s has different UUID to %s\n",
5195 bdevname(rdev
->bdev
,b
),
5196 bdevname(rdev0
->bdev
,b2
));
5201 err
= bind_rdev_to_array(rdev
, mddev
);
5208 * add_new_disk can be used once the array is assembled
5209 * to add "hot spares". They must already have a superblock
5214 if (!mddev
->pers
->hot_add_disk
) {
5216 "%s: personality does not support diskops!\n",
5220 if (mddev
->persistent
)
5221 rdev
= md_import_device(dev
, mddev
->major_version
,
5222 mddev
->minor_version
);
5224 rdev
= md_import_device(dev
, -1, -1);
5227 "md: md_import_device returned %ld\n",
5229 return PTR_ERR(rdev
);
5231 /* set saved_raid_disk if appropriate */
5232 if (!mddev
->persistent
) {
5233 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5234 info
->raid_disk
< mddev
->raid_disks
) {
5235 rdev
->raid_disk
= info
->raid_disk
;
5236 set_bit(In_sync
, &rdev
->flags
);
5238 rdev
->raid_disk
= -1;
5240 super_types
[mddev
->major_version
].
5241 validate_super(mddev
, rdev
);
5242 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5243 (!test_bit(In_sync
, &rdev
->flags
) ||
5244 rdev
->raid_disk
!= info
->raid_disk
)) {
5245 /* This was a hot-add request, but events doesn't
5246 * match, so reject it.
5252 if (test_bit(In_sync
, &rdev
->flags
))
5253 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5255 rdev
->saved_raid_disk
= -1;
5257 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5258 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5259 set_bit(WriteMostly
, &rdev
->flags
);
5261 clear_bit(WriteMostly
, &rdev
->flags
);
5263 rdev
->raid_disk
= -1;
5264 err
= bind_rdev_to_array(rdev
, mddev
);
5265 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5266 /* If there is hot_add_disk but no hot_remove_disk
5267 * then added disks for geometry changes,
5268 * and should be added immediately.
5270 super_types
[mddev
->major_version
].
5271 validate_super(mddev
, rdev
);
5272 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5274 unbind_rdev_from_array(rdev
);
5279 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5281 md_update_sb(mddev
, 1);
5282 if (mddev
->degraded
)
5283 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5284 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5286 md_new_event(mddev
);
5287 md_wakeup_thread(mddev
->thread
);
5291 /* otherwise, add_new_disk is only allowed
5292 * for major_version==0 superblocks
5294 if (mddev
->major_version
!= 0) {
5295 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5300 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5302 rdev
= md_import_device(dev
, -1, 0);
5305 "md: error, md_import_device() returned %ld\n",
5307 return PTR_ERR(rdev
);
5309 rdev
->desc_nr
= info
->number
;
5310 if (info
->raid_disk
< mddev
->raid_disks
)
5311 rdev
->raid_disk
= info
->raid_disk
;
5313 rdev
->raid_disk
= -1;
5315 if (rdev
->raid_disk
< mddev
->raid_disks
)
5316 if (info
->state
& (1<<MD_DISK_SYNC
))
5317 set_bit(In_sync
, &rdev
->flags
);
5319 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5320 set_bit(WriteMostly
, &rdev
->flags
);
5322 if (!mddev
->persistent
) {
5323 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5324 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5326 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5327 rdev
->sectors
= rdev
->sb_start
;
5329 err
= bind_rdev_to_array(rdev
, mddev
);
5339 static int hot_remove_disk(mddev_t
* mddev
, dev_t dev
)
5341 char b
[BDEVNAME_SIZE
];
5344 rdev
= find_rdev(mddev
, dev
);
5348 if (rdev
->raid_disk
>= 0)
5351 kick_rdev_from_array(rdev
);
5352 md_update_sb(mddev
, 1);
5353 md_new_event(mddev
);
5357 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5358 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5362 static int hot_add_disk(mddev_t
* mddev
, dev_t dev
)
5364 char b
[BDEVNAME_SIZE
];
5371 if (mddev
->major_version
!= 0) {
5372 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5373 " version-0 superblocks.\n",
5377 if (!mddev
->pers
->hot_add_disk
) {
5379 "%s: personality does not support diskops!\n",
5384 rdev
= md_import_device(dev
, -1, 0);
5387 "md: error, md_import_device() returned %ld\n",
5392 if (mddev
->persistent
)
5393 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5395 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5397 rdev
->sectors
= rdev
->sb_start
;
5399 if (test_bit(Faulty
, &rdev
->flags
)) {
5401 "md: can not hot-add faulty %s disk to %s!\n",
5402 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5406 clear_bit(In_sync
, &rdev
->flags
);
5408 rdev
->saved_raid_disk
= -1;
5409 err
= bind_rdev_to_array(rdev
, mddev
);
5414 * The rest should better be atomic, we can have disk failures
5415 * noticed in interrupt contexts ...
5418 rdev
->raid_disk
= -1;
5420 md_update_sb(mddev
, 1);
5423 * Kick recovery, maybe this spare has to be added to the
5424 * array immediately.
5426 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5427 md_wakeup_thread(mddev
->thread
);
5428 md_new_event(mddev
);
5436 static int set_bitmap_file(mddev_t
*mddev
, int fd
)
5441 if (!mddev
->pers
->quiesce
)
5443 if (mddev
->recovery
|| mddev
->sync_thread
)
5445 /* we should be able to change the bitmap.. */
5451 return -EEXIST
; /* cannot add when bitmap is present */
5452 mddev
->bitmap_info
.file
= fget(fd
);
5454 if (mddev
->bitmap_info
.file
== NULL
) {
5455 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5460 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
5462 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5464 fput(mddev
->bitmap_info
.file
);
5465 mddev
->bitmap_info
.file
= NULL
;
5468 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5469 } else if (mddev
->bitmap
== NULL
)
5470 return -ENOENT
; /* cannot remove what isn't there */
5473 mddev
->pers
->quiesce(mddev
, 1);
5475 err
= bitmap_create(mddev
);
5477 err
= bitmap_load(mddev
);
5479 if (fd
< 0 || err
) {
5480 bitmap_destroy(mddev
);
5481 fd
= -1; /* make sure to put the file */
5483 mddev
->pers
->quiesce(mddev
, 0);
5486 if (mddev
->bitmap_info
.file
) {
5487 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5488 fput(mddev
->bitmap_info
.file
);
5490 mddev
->bitmap_info
.file
= NULL
;
5497 * set_array_info is used two different ways
5498 * The original usage is when creating a new array.
5499 * In this usage, raid_disks is > 0 and it together with
5500 * level, size, not_persistent,layout,chunksize determine the
5501 * shape of the array.
5502 * This will always create an array with a type-0.90.0 superblock.
5503 * The newer usage is when assembling an array.
5504 * In this case raid_disks will be 0, and the major_version field is
5505 * use to determine which style super-blocks are to be found on the devices.
5506 * The minor and patch _version numbers are also kept incase the
5507 * super_block handler wishes to interpret them.
5509 static int set_array_info(mddev_t
* mddev
, mdu_array_info_t
*info
)
5512 if (info
->raid_disks
== 0) {
5513 /* just setting version number for superblock loading */
5514 if (info
->major_version
< 0 ||
5515 info
->major_version
>= ARRAY_SIZE(super_types
) ||
5516 super_types
[info
->major_version
].name
== NULL
) {
5517 /* maybe try to auto-load a module? */
5519 "md: superblock version %d not known\n",
5520 info
->major_version
);
5523 mddev
->major_version
= info
->major_version
;
5524 mddev
->minor_version
= info
->minor_version
;
5525 mddev
->patch_version
= info
->patch_version
;
5526 mddev
->persistent
= !info
->not_persistent
;
5527 /* ensure mddev_put doesn't delete this now that there
5528 * is some minimal configuration.
5530 mddev
->ctime
= get_seconds();
5533 mddev
->major_version
= MD_MAJOR_VERSION
;
5534 mddev
->minor_version
= MD_MINOR_VERSION
;
5535 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
5536 mddev
->ctime
= get_seconds();
5538 mddev
->level
= info
->level
;
5539 mddev
->clevel
[0] = 0;
5540 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
5541 mddev
->raid_disks
= info
->raid_disks
;
5542 /* don't set md_minor, it is determined by which /dev/md* was
5545 if (info
->state
& (1<<MD_SB_CLEAN
))
5546 mddev
->recovery_cp
= MaxSector
;
5548 mddev
->recovery_cp
= 0;
5549 mddev
->persistent
= ! info
->not_persistent
;
5550 mddev
->external
= 0;
5552 mddev
->layout
= info
->layout
;
5553 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
5555 mddev
->max_disks
= MD_SB_DISKS
;
5557 if (mddev
->persistent
)
5559 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5561 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
5562 mddev
->bitmap_info
.offset
= 0;
5564 mddev
->reshape_position
= MaxSector
;
5567 * Generate a 128 bit UUID
5569 get_random_bytes(mddev
->uuid
, 16);
5571 mddev
->new_level
= mddev
->level
;
5572 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
5573 mddev
->new_layout
= mddev
->layout
;
5574 mddev
->delta_disks
= 0;
5579 void md_set_array_sectors(mddev_t
*mddev
, sector_t array_sectors
)
5581 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
5583 if (mddev
->external_size
)
5586 mddev
->array_sectors
= array_sectors
;
5588 EXPORT_SYMBOL(md_set_array_sectors
);
5590 static int update_size(mddev_t
*mddev
, sector_t num_sectors
)
5594 int fit
= (num_sectors
== 0);
5596 if (mddev
->pers
->resize
== NULL
)
5598 /* The "num_sectors" is the number of sectors of each device that
5599 * is used. This can only make sense for arrays with redundancy.
5600 * linear and raid0 always use whatever space is available. We can only
5601 * consider changing this number if no resync or reconstruction is
5602 * happening, and if the new size is acceptable. It must fit before the
5603 * sb_start or, if that is <data_offset, it must fit before the size
5604 * of each device. If num_sectors is zero, we find the largest size
5607 if (mddev
->sync_thread
)
5610 /* Sorry, cannot grow a bitmap yet, just remove it,
5614 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
5615 sector_t avail
= rdev
->sectors
;
5617 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
5618 num_sectors
= avail
;
5619 if (avail
< num_sectors
)
5622 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
5624 revalidate_disk(mddev
->gendisk
);
5628 static int update_raid_disks(mddev_t
*mddev
, int raid_disks
)
5631 /* change the number of raid disks */
5632 if (mddev
->pers
->check_reshape
== NULL
)
5634 if (raid_disks
<= 0 ||
5635 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
5637 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
5639 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
5641 rv
= mddev
->pers
->check_reshape(mddev
);
5643 mddev
->delta_disks
= 0;
5649 * update_array_info is used to change the configuration of an
5651 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5652 * fields in the info are checked against the array.
5653 * Any differences that cannot be handled will cause an error.
5654 * Normally, only one change can be managed at a time.
5656 static int update_array_info(mddev_t
*mddev
, mdu_array_info_t
*info
)
5662 /* calculate expected state,ignoring low bits */
5663 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5664 state
|= (1 << MD_SB_BITMAP_PRESENT
);
5666 if (mddev
->major_version
!= info
->major_version
||
5667 mddev
->minor_version
!= info
->minor_version
||
5668 /* mddev->patch_version != info->patch_version || */
5669 mddev
->ctime
!= info
->ctime
||
5670 mddev
->level
!= info
->level
||
5671 /* mddev->layout != info->layout || */
5672 !mddev
->persistent
!= info
->not_persistent
||
5673 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
5674 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5675 ((state
^info
->state
) & 0xfffffe00)
5678 /* Check there is only one change */
5679 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5681 if (mddev
->raid_disks
!= info
->raid_disks
)
5683 if (mddev
->layout
!= info
->layout
)
5685 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
5692 if (mddev
->layout
!= info
->layout
) {
5694 * we don't need to do anything at the md level, the
5695 * personality will take care of it all.
5697 if (mddev
->pers
->check_reshape
== NULL
)
5700 mddev
->new_layout
= info
->layout
;
5701 rv
= mddev
->pers
->check_reshape(mddev
);
5703 mddev
->new_layout
= mddev
->layout
;
5707 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
5708 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
5710 if (mddev
->raid_disks
!= info
->raid_disks
)
5711 rv
= update_raid_disks(mddev
, info
->raid_disks
);
5713 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
5714 if (mddev
->pers
->quiesce
== NULL
)
5716 if (mddev
->recovery
|| mddev
->sync_thread
)
5718 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
5719 /* add the bitmap */
5722 if (mddev
->bitmap_info
.default_offset
== 0)
5724 mddev
->bitmap_info
.offset
=
5725 mddev
->bitmap_info
.default_offset
;
5726 mddev
->pers
->quiesce(mddev
, 1);
5727 rv
= bitmap_create(mddev
);
5729 rv
= bitmap_load(mddev
);
5731 bitmap_destroy(mddev
);
5732 mddev
->pers
->quiesce(mddev
, 0);
5734 /* remove the bitmap */
5737 if (mddev
->bitmap
->file
)
5739 mddev
->pers
->quiesce(mddev
, 1);
5740 bitmap_destroy(mddev
);
5741 mddev
->pers
->quiesce(mddev
, 0);
5742 mddev
->bitmap_info
.offset
= 0;
5745 md_update_sb(mddev
, 1);
5749 static int set_disk_faulty(mddev_t
*mddev
, dev_t dev
)
5753 if (mddev
->pers
== NULL
)
5756 rdev
= find_rdev(mddev
, dev
);
5760 md_error(mddev
, rdev
);
5765 * We have a problem here : there is no easy way to give a CHS
5766 * virtual geometry. We currently pretend that we have a 2 heads
5767 * 4 sectors (with a BIG number of cylinders...). This drives
5768 * dosfs just mad... ;-)
5770 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
5772 mddev_t
*mddev
= bdev
->bd_disk
->private_data
;
5776 geo
->cylinders
= mddev
->array_sectors
/ 8;
5780 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
5781 unsigned int cmd
, unsigned long arg
)
5784 void __user
*argp
= (void __user
*)arg
;
5785 mddev_t
*mddev
= NULL
;
5788 if (!capable(CAP_SYS_ADMIN
))
5792 * Commands dealing with the RAID driver but not any
5798 err
= get_version(argp
);
5801 case PRINT_RAID_DEBUG
:
5809 autostart_arrays(arg
);
5816 * Commands creating/starting a new array:
5819 mddev
= bdev
->bd_disk
->private_data
;
5826 err
= mddev_lock(mddev
);
5829 "md: ioctl lock interrupted, reason %d, cmd %d\n",
5836 case SET_ARRAY_INFO
:
5838 mdu_array_info_t info
;
5840 memset(&info
, 0, sizeof(info
));
5841 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
5846 err
= update_array_info(mddev
, &info
);
5848 printk(KERN_WARNING
"md: couldn't update"
5849 " array info. %d\n", err
);
5854 if (!list_empty(&mddev
->disks
)) {
5856 "md: array %s already has disks!\n",
5861 if (mddev
->raid_disks
) {
5863 "md: array %s already initialised!\n",
5868 err
= set_array_info(mddev
, &info
);
5870 printk(KERN_WARNING
"md: couldn't set"
5871 " array info. %d\n", err
);
5881 * Commands querying/configuring an existing array:
5883 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5884 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5885 if ((!mddev
->raid_disks
&& !mddev
->external
)
5886 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
5887 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
5888 && cmd
!= GET_BITMAP_FILE
) {
5894 * Commands even a read-only array can execute:
5898 case GET_ARRAY_INFO
:
5899 err
= get_array_info(mddev
, argp
);
5902 case GET_BITMAP_FILE
:
5903 err
= get_bitmap_file(mddev
, argp
);
5907 err
= get_disk_info(mddev
, argp
);
5910 case RESTART_ARRAY_RW
:
5911 err
= restart_array(mddev
);
5915 err
= do_md_stop(mddev
, 0, 1);
5919 err
= md_set_readonly(mddev
, 1);
5923 if (get_user(ro
, (int __user
*)(arg
))) {
5929 /* if the bdev is going readonly the value of mddev->ro
5930 * does not matter, no writes are coming
5935 /* are we are already prepared for writes? */
5939 /* transitioning to readauto need only happen for
5940 * arrays that call md_write_start
5943 err
= restart_array(mddev
);
5946 set_disk_ro(mddev
->gendisk
, 0);
5953 * The remaining ioctls are changing the state of the
5954 * superblock, so we do not allow them on read-only arrays.
5955 * However non-MD ioctls (e.g. get-size) will still come through
5956 * here and hit the 'default' below, so only disallow
5957 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5959 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
5960 if (mddev
->ro
== 2) {
5962 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5963 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5964 md_wakeup_thread(mddev
->thread
);
5975 mdu_disk_info_t info
;
5976 if (copy_from_user(&info
, argp
, sizeof(info
)))
5979 err
= add_new_disk(mddev
, &info
);
5983 case HOT_REMOVE_DISK
:
5984 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
5988 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
5991 case SET_DISK_FAULTY
:
5992 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
5996 err
= do_md_run(mddev
);
5999 case SET_BITMAP_FILE
:
6000 err
= set_bitmap_file(mddev
, (int)arg
);
6010 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6012 mddev
->hold_active
= 0;
6013 mddev_unlock(mddev
);
6022 #ifdef CONFIG_COMPAT
6023 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6024 unsigned int cmd
, unsigned long arg
)
6027 case HOT_REMOVE_DISK
:
6029 case SET_DISK_FAULTY
:
6030 case SET_BITMAP_FILE
:
6031 /* These take in integer arg, do not convert */
6034 arg
= (unsigned long)compat_ptr(arg
);
6038 return md_ioctl(bdev
, mode
, cmd
, arg
);
6040 #endif /* CONFIG_COMPAT */
6042 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6045 * Succeed if we can lock the mddev, which confirms that
6046 * it isn't being stopped right now.
6048 mddev_t
*mddev
= mddev_find(bdev
->bd_dev
);
6051 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6052 /* we are racing with mddev_put which is discarding this
6056 /* Wait until bdev->bd_disk is definitely gone */
6057 flush_workqueue(md_misc_wq
);
6058 /* Then retry the open from the top */
6059 return -ERESTARTSYS
;
6061 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6063 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6067 atomic_inc(&mddev
->openers
);
6068 mutex_unlock(&mddev
->open_mutex
);
6070 check_disk_change(bdev
);
6075 static int md_release(struct gendisk
*disk
, fmode_t mode
)
6077 mddev_t
*mddev
= disk
->private_data
;
6080 atomic_dec(&mddev
->openers
);
6086 static int md_media_changed(struct gendisk
*disk
)
6088 mddev_t
*mddev
= disk
->private_data
;
6090 return mddev
->changed
;
6093 static int md_revalidate(struct gendisk
*disk
)
6095 mddev_t
*mddev
= disk
->private_data
;
6100 static const struct block_device_operations md_fops
=
6102 .owner
= THIS_MODULE
,
6104 .release
= md_release
,
6106 #ifdef CONFIG_COMPAT
6107 .compat_ioctl
= md_compat_ioctl
,
6109 .getgeo
= md_getgeo
,
6110 .media_changed
= md_media_changed
,
6111 .revalidate_disk
= md_revalidate
,
6114 static int md_thread(void * arg
)
6116 mdk_thread_t
*thread
= arg
;
6119 * md_thread is a 'system-thread', it's priority should be very
6120 * high. We avoid resource deadlocks individually in each
6121 * raid personality. (RAID5 does preallocation) We also use RR and
6122 * the very same RT priority as kswapd, thus we will never get
6123 * into a priority inversion deadlock.
6125 * we definitely have to have equal or higher priority than
6126 * bdflush, otherwise bdflush will deadlock if there are too
6127 * many dirty RAID5 blocks.
6130 allow_signal(SIGKILL
);
6131 while (!kthread_should_stop()) {
6133 /* We need to wait INTERRUPTIBLE so that
6134 * we don't add to the load-average.
6135 * That means we need to be sure no signals are
6138 if (signal_pending(current
))
6139 flush_signals(current
);
6141 wait_event_interruptible_timeout
6143 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6144 || kthread_should_stop(),
6147 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6148 if (!kthread_should_stop())
6149 thread
->run(thread
->mddev
);
6155 void md_wakeup_thread(mdk_thread_t
*thread
)
6158 dprintk("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6159 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6160 wake_up(&thread
->wqueue
);
6164 mdk_thread_t
*md_register_thread(void (*run
) (mddev_t
*), mddev_t
*mddev
,
6167 mdk_thread_t
*thread
;
6169 thread
= kzalloc(sizeof(mdk_thread_t
), GFP_KERNEL
);
6173 init_waitqueue_head(&thread
->wqueue
);
6176 thread
->mddev
= mddev
;
6177 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6178 thread
->tsk
= kthread_run(md_thread
, thread
,
6180 mdname(thread
->mddev
),
6181 name
?: mddev
->pers
->name
);
6182 if (IS_ERR(thread
->tsk
)) {
6189 void md_unregister_thread(mdk_thread_t
*thread
)
6193 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6195 kthread_stop(thread
->tsk
);
6199 void md_error(mddev_t
*mddev
, mdk_rdev_t
*rdev
)
6206 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6209 if (mddev
->external
)
6210 set_bit(Blocked
, &rdev
->flags
);
6212 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
6214 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
6215 __builtin_return_address(0),__builtin_return_address(1),
6216 __builtin_return_address(2),__builtin_return_address(3));
6220 if (!mddev
->pers
->error_handler
)
6222 mddev
->pers
->error_handler(mddev
,rdev
);
6223 if (mddev
->degraded
)
6224 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6225 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6226 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6227 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6228 md_wakeup_thread(mddev
->thread
);
6229 if (mddev
->event_work
.func
)
6230 queue_work(md_misc_wq
, &mddev
->event_work
);
6231 md_new_event_inintr(mddev
);
6234 /* seq_file implementation /proc/mdstat */
6236 static void status_unused(struct seq_file
*seq
)
6241 seq_printf(seq
, "unused devices: ");
6243 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6244 char b
[BDEVNAME_SIZE
];
6246 seq_printf(seq
, "%s ",
6247 bdevname(rdev
->bdev
,b
));
6250 seq_printf(seq
, "<none>");
6252 seq_printf(seq
, "\n");
6256 static void status_resync(struct seq_file
*seq
, mddev_t
* mddev
)
6258 sector_t max_sectors
, resync
, res
;
6259 unsigned long dt
, db
;
6262 unsigned int per_milli
;
6264 resync
= mddev
->curr_resync
- atomic_read(&mddev
->recovery_active
);
6266 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
6267 max_sectors
= mddev
->resync_max_sectors
;
6269 max_sectors
= mddev
->dev_sectors
;
6272 * Should not happen.
6278 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6279 * in a sector_t, and (max_sectors>>scale) will fit in a
6280 * u32, as those are the requirements for sector_div.
6281 * Thus 'scale' must be at least 10
6284 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6285 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6288 res
= (resync
>>scale
)*1000;
6289 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6293 int i
, x
= per_milli
/50, y
= 20-x
;
6294 seq_printf(seq
, "[");
6295 for (i
= 0; i
< x
; i
++)
6296 seq_printf(seq
, "=");
6297 seq_printf(seq
, ">");
6298 for (i
= 0; i
< y
; i
++)
6299 seq_printf(seq
, ".");
6300 seq_printf(seq
, "] ");
6302 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6303 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6305 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6307 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6308 "resync" : "recovery"))),
6309 per_milli
/10, per_milli
% 10,
6310 (unsigned long long) resync
/2,
6311 (unsigned long long) max_sectors
/2);
6314 * dt: time from mark until now
6315 * db: blocks written from mark until now
6316 * rt: remaining time
6318 * rt is a sector_t, so could be 32bit or 64bit.
6319 * So we divide before multiply in case it is 32bit and close
6321 * We scale the divisor (db) by 32 to avoid losing precision
6322 * near the end of resync when the number of remaining sectors
6324 * We then divide rt by 32 after multiplying by db to compensate.
6325 * The '+1' avoids division by zero if db is very small.
6327 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6329 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6330 - mddev
->resync_mark_cnt
;
6332 rt
= max_sectors
- resync
; /* number of remaining sectors */
6333 sector_div(rt
, db
/32+1);
6337 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6338 ((unsigned long)rt
% 60)/6);
6340 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6343 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6345 struct list_head
*tmp
;
6355 spin_lock(&all_mddevs_lock
);
6356 list_for_each(tmp
,&all_mddevs
)
6358 mddev
= list_entry(tmp
, mddev_t
, all_mddevs
);
6360 spin_unlock(&all_mddevs_lock
);
6363 spin_unlock(&all_mddevs_lock
);
6365 return (void*)2;/* tail */
6369 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6371 struct list_head
*tmp
;
6372 mddev_t
*next_mddev
, *mddev
= v
;
6378 spin_lock(&all_mddevs_lock
);
6380 tmp
= all_mddevs
.next
;
6382 tmp
= mddev
->all_mddevs
.next
;
6383 if (tmp
!= &all_mddevs
)
6384 next_mddev
= mddev_get(list_entry(tmp
,mddev_t
,all_mddevs
));
6386 next_mddev
= (void*)2;
6389 spin_unlock(&all_mddevs_lock
);
6397 static void md_seq_stop(struct seq_file
*seq
, void *v
)
6401 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
6405 struct mdstat_info
{
6409 static int md_seq_show(struct seq_file
*seq
, void *v
)
6414 struct mdstat_info
*mi
= seq
->private;
6415 struct bitmap
*bitmap
;
6417 if (v
== (void*)1) {
6418 struct mdk_personality
*pers
;
6419 seq_printf(seq
, "Personalities : ");
6420 spin_lock(&pers_lock
);
6421 list_for_each_entry(pers
, &pers_list
, list
)
6422 seq_printf(seq
, "[%s] ", pers
->name
);
6424 spin_unlock(&pers_lock
);
6425 seq_printf(seq
, "\n");
6426 mi
->event
= atomic_read(&md_event_count
);
6429 if (v
== (void*)2) {
6434 if (mddev_lock(mddev
) < 0)
6437 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
6438 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
6439 mddev
->pers
? "" : "in");
6442 seq_printf(seq
, " (read-only)");
6444 seq_printf(seq
, " (auto-read-only)");
6445 seq_printf(seq
, " %s", mddev
->pers
->name
);
6449 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
6450 char b
[BDEVNAME_SIZE
];
6451 seq_printf(seq
, " %s[%d]",
6452 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
6453 if (test_bit(WriteMostly
, &rdev
->flags
))
6454 seq_printf(seq
, "(W)");
6455 if (test_bit(Faulty
, &rdev
->flags
)) {
6456 seq_printf(seq
, "(F)");
6458 } else if (rdev
->raid_disk
< 0)
6459 seq_printf(seq
, "(S)"); /* spare */
6460 sectors
+= rdev
->sectors
;
6463 if (!list_empty(&mddev
->disks
)) {
6465 seq_printf(seq
, "\n %llu blocks",
6466 (unsigned long long)
6467 mddev
->array_sectors
/ 2);
6469 seq_printf(seq
, "\n %llu blocks",
6470 (unsigned long long)sectors
/ 2);
6472 if (mddev
->persistent
) {
6473 if (mddev
->major_version
!= 0 ||
6474 mddev
->minor_version
!= 90) {
6475 seq_printf(seq
," super %d.%d",
6476 mddev
->major_version
,
6477 mddev
->minor_version
);
6479 } else if (mddev
->external
)
6480 seq_printf(seq
, " super external:%s",
6481 mddev
->metadata_type
);
6483 seq_printf(seq
, " super non-persistent");
6486 mddev
->pers
->status(seq
, mddev
);
6487 seq_printf(seq
, "\n ");
6488 if (mddev
->pers
->sync_request
) {
6489 if (mddev
->curr_resync
> 2) {
6490 status_resync(seq
, mddev
);
6491 seq_printf(seq
, "\n ");
6492 } else if (mddev
->curr_resync
== 1 || mddev
->curr_resync
== 2)
6493 seq_printf(seq
, "\tresync=DELAYED\n ");
6494 else if (mddev
->recovery_cp
< MaxSector
)
6495 seq_printf(seq
, "\tresync=PENDING\n ");
6498 seq_printf(seq
, "\n ");
6500 if ((bitmap
= mddev
->bitmap
)) {
6501 unsigned long chunk_kb
;
6502 unsigned long flags
;
6503 spin_lock_irqsave(&bitmap
->lock
, flags
);
6504 chunk_kb
= mddev
->bitmap_info
.chunksize
>> 10;
6505 seq_printf(seq
, "bitmap: %lu/%lu pages [%luKB], "
6507 bitmap
->pages
- bitmap
->missing_pages
,
6509 (bitmap
->pages
- bitmap
->missing_pages
)
6510 << (PAGE_SHIFT
- 10),
6511 chunk_kb
? chunk_kb
: mddev
->bitmap_info
.chunksize
,
6512 chunk_kb
? "KB" : "B");
6514 seq_printf(seq
, ", file: ");
6515 seq_path(seq
, &bitmap
->file
->f_path
, " \t\n");
6518 seq_printf(seq
, "\n");
6519 spin_unlock_irqrestore(&bitmap
->lock
, flags
);
6522 seq_printf(seq
, "\n");
6524 mddev_unlock(mddev
);
6529 static const struct seq_operations md_seq_ops
= {
6530 .start
= md_seq_start
,
6531 .next
= md_seq_next
,
6532 .stop
= md_seq_stop
,
6533 .show
= md_seq_show
,
6536 static int md_seq_open(struct inode
*inode
, struct file
*file
)
6539 struct mdstat_info
*mi
= kmalloc(sizeof(*mi
), GFP_KERNEL
);
6543 error
= seq_open(file
, &md_seq_ops
);
6547 struct seq_file
*p
= file
->private_data
;
6549 mi
->event
= atomic_read(&md_event_count
);
6554 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
6556 struct seq_file
*m
= filp
->private_data
;
6557 struct mdstat_info
*mi
= m
->private;
6560 poll_wait(filp
, &md_event_waiters
, wait
);
6562 /* always allow read */
6563 mask
= POLLIN
| POLLRDNORM
;
6565 if (mi
->event
!= atomic_read(&md_event_count
))
6566 mask
|= POLLERR
| POLLPRI
;
6570 static const struct file_operations md_seq_fops
= {
6571 .owner
= THIS_MODULE
,
6572 .open
= md_seq_open
,
6574 .llseek
= seq_lseek
,
6575 .release
= seq_release_private
,
6576 .poll
= mdstat_poll
,
6579 int register_md_personality(struct mdk_personality
*p
)
6581 spin_lock(&pers_lock
);
6582 list_add_tail(&p
->list
, &pers_list
);
6583 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
6584 spin_unlock(&pers_lock
);
6588 int unregister_md_personality(struct mdk_personality
*p
)
6590 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
6591 spin_lock(&pers_lock
);
6592 list_del_init(&p
->list
);
6593 spin_unlock(&pers_lock
);
6597 static int is_mddev_idle(mddev_t
*mddev
, int init
)
6605 rdev_for_each_rcu(rdev
, mddev
) {
6606 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
6607 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
6608 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
6609 atomic_read(&disk
->sync_io
);
6610 /* sync IO will cause sync_io to increase before the disk_stats
6611 * as sync_io is counted when a request starts, and
6612 * disk_stats is counted when it completes.
6613 * So resync activity will cause curr_events to be smaller than
6614 * when there was no such activity.
6615 * non-sync IO will cause disk_stat to increase without
6616 * increasing sync_io so curr_events will (eventually)
6617 * be larger than it was before. Once it becomes
6618 * substantially larger, the test below will cause
6619 * the array to appear non-idle, and resync will slow
6621 * If there is a lot of outstanding resync activity when
6622 * we set last_event to curr_events, then all that activity
6623 * completing might cause the array to appear non-idle
6624 * and resync will be slowed down even though there might
6625 * not have been non-resync activity. This will only
6626 * happen once though. 'last_events' will soon reflect
6627 * the state where there is little or no outstanding
6628 * resync requests, and further resync activity will
6629 * always make curr_events less than last_events.
6632 if (init
|| curr_events
- rdev
->last_events
> 64) {
6633 rdev
->last_events
= curr_events
;
6641 void md_done_sync(mddev_t
*mddev
, int blocks
, int ok
)
6643 /* another "blocks" (512byte) blocks have been synced */
6644 atomic_sub(blocks
, &mddev
->recovery_active
);
6645 wake_up(&mddev
->recovery_wait
);
6647 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6648 md_wakeup_thread(mddev
->thread
);
6649 // stop recovery, signal do_sync ....
6654 /* md_write_start(mddev, bi)
6655 * If we need to update some array metadata (e.g. 'active' flag
6656 * in superblock) before writing, schedule a superblock update
6657 * and wait for it to complete.
6659 void md_write_start(mddev_t
*mddev
, struct bio
*bi
)
6662 if (bio_data_dir(bi
) != WRITE
)
6665 BUG_ON(mddev
->ro
== 1);
6666 if (mddev
->ro
== 2) {
6667 /* need to switch to read/write */
6669 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6670 md_wakeup_thread(mddev
->thread
);
6671 md_wakeup_thread(mddev
->sync_thread
);
6674 atomic_inc(&mddev
->writes_pending
);
6675 if (mddev
->safemode
== 1)
6676 mddev
->safemode
= 0;
6677 if (mddev
->in_sync
) {
6678 spin_lock_irq(&mddev
->write_lock
);
6679 if (mddev
->in_sync
) {
6681 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6682 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6683 md_wakeup_thread(mddev
->thread
);
6686 spin_unlock_irq(&mddev
->write_lock
);
6689 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6690 wait_event(mddev
->sb_wait
,
6691 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6694 void md_write_end(mddev_t
*mddev
)
6696 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
6697 if (mddev
->safemode
== 2)
6698 md_wakeup_thread(mddev
->thread
);
6699 else if (mddev
->safemode_delay
)
6700 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
6704 /* md_allow_write(mddev)
6705 * Calling this ensures that the array is marked 'active' so that writes
6706 * may proceed without blocking. It is important to call this before
6707 * attempting a GFP_KERNEL allocation while holding the mddev lock.
6708 * Must be called with mddev_lock held.
6710 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6711 * is dropped, so return -EAGAIN after notifying userspace.
6713 int md_allow_write(mddev_t
*mddev
)
6719 if (!mddev
->pers
->sync_request
)
6722 spin_lock_irq(&mddev
->write_lock
);
6723 if (mddev
->in_sync
) {
6725 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6726 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
6727 if (mddev
->safemode_delay
&&
6728 mddev
->safemode
== 0)
6729 mddev
->safemode
= 1;
6730 spin_unlock_irq(&mddev
->write_lock
);
6731 md_update_sb(mddev
, 0);
6732 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6734 spin_unlock_irq(&mddev
->write_lock
);
6736 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
6741 EXPORT_SYMBOL_GPL(md_allow_write
);
6743 #define SYNC_MARKS 10
6744 #define SYNC_MARK_STEP (3*HZ)
6745 void md_do_sync(mddev_t
*mddev
)
6748 unsigned int currspeed
= 0,
6750 sector_t max_sectors
,j
, io_sectors
;
6751 unsigned long mark
[SYNC_MARKS
];
6752 sector_t mark_cnt
[SYNC_MARKS
];
6754 struct list_head
*tmp
;
6755 sector_t last_check
;
6760 /* just incase thread restarts... */
6761 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
6763 if (mddev
->ro
) /* never try to sync a read-only array */
6766 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6767 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
6768 desc
= "data-check";
6769 else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6770 desc
= "requested-resync";
6773 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6778 /* we overload curr_resync somewhat here.
6779 * 0 == not engaged in resync at all
6780 * 2 == checking that there is no conflict with another sync
6781 * 1 == like 2, but have yielded to allow conflicting resync to
6783 * other == active in resync - this many blocks
6785 * Before starting a resync we must have set curr_resync to
6786 * 2, and then checked that every "conflicting" array has curr_resync
6787 * less than ours. When we find one that is the same or higher
6788 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
6789 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6790 * This will mean we have to start checking from the beginning again.
6795 mddev
->curr_resync
= 2;
6798 if (kthread_should_stop())
6799 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6801 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6803 for_each_mddev(mddev2
, tmp
) {
6804 if (mddev2
== mddev
)
6806 if (!mddev
->parallel_resync
6807 && mddev2
->curr_resync
6808 && match_mddev_units(mddev
, mddev2
)) {
6810 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
6811 /* arbitrarily yield */
6812 mddev
->curr_resync
= 1;
6813 wake_up(&resync_wait
);
6815 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
6816 /* no need to wait here, we can wait the next
6817 * time 'round when curr_resync == 2
6820 /* We need to wait 'interruptible' so as not to
6821 * contribute to the load average, and not to
6822 * be caught by 'softlockup'
6824 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
6825 if (!kthread_should_stop() &&
6826 mddev2
->curr_resync
>= mddev
->curr_resync
) {
6827 printk(KERN_INFO
"md: delaying %s of %s"
6828 " until %s has finished (they"
6829 " share one or more physical units)\n",
6830 desc
, mdname(mddev
), mdname(mddev2
));
6832 if (signal_pending(current
))
6833 flush_signals(current
);
6835 finish_wait(&resync_wait
, &wq
);
6838 finish_wait(&resync_wait
, &wq
);
6841 } while (mddev
->curr_resync
< 2);
6844 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
6845 /* resync follows the size requested by the personality,
6846 * which defaults to physical size, but can be virtual size
6848 max_sectors
= mddev
->resync_max_sectors
;
6849 mddev
->resync_mismatches
= 0;
6850 /* we don't use the checkpoint if there's a bitmap */
6851 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
6852 j
= mddev
->resync_min
;
6853 else if (!mddev
->bitmap
)
6854 j
= mddev
->recovery_cp
;
6856 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6857 max_sectors
= mddev
->dev_sectors
;
6859 /* recovery follows the physical size of devices */
6860 max_sectors
= mddev
->dev_sectors
;
6863 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
6864 if (rdev
->raid_disk
>= 0 &&
6865 !test_bit(Faulty
, &rdev
->flags
) &&
6866 !test_bit(In_sync
, &rdev
->flags
) &&
6867 rdev
->recovery_offset
< j
)
6868 j
= rdev
->recovery_offset
;
6872 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
6873 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
6874 " %d KB/sec/disk.\n", speed_min(mddev
));
6875 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
6876 "(but not more than %d KB/sec) for %s.\n",
6877 speed_max(mddev
), desc
);
6879 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
6882 for (m
= 0; m
< SYNC_MARKS
; m
++) {
6884 mark_cnt
[m
] = io_sectors
;
6887 mddev
->resync_mark
= mark
[last_mark
];
6888 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
6891 * Tune reconstruction:
6893 window
= 32*(PAGE_SIZE
/512);
6894 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
6895 window
/2, (unsigned long long)max_sectors
/2);
6897 atomic_set(&mddev
->recovery_active
, 0);
6902 "md: resuming %s of %s from checkpoint.\n",
6903 desc
, mdname(mddev
));
6904 mddev
->curr_resync
= j
;
6906 mddev
->curr_resync_completed
= j
;
6908 while (j
< max_sectors
) {
6913 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
6914 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
6915 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
6916 > (max_sectors
>> 4)) ||
6917 (j
- mddev
->curr_resync_completed
)*2
6918 >= mddev
->resync_max
- mddev
->curr_resync_completed
6920 /* time to update curr_resync_completed */
6921 wait_event(mddev
->recovery_wait
,
6922 atomic_read(&mddev
->recovery_active
) == 0);
6923 mddev
->curr_resync_completed
= j
;
6924 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
6925 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
6928 while (j
>= mddev
->resync_max
&& !kthread_should_stop()) {
6929 /* As this condition is controlled by user-space,
6930 * we can block indefinitely, so use '_interruptible'
6931 * to avoid triggering warnings.
6933 flush_signals(current
); /* just in case */
6934 wait_event_interruptible(mddev
->recovery_wait
,
6935 mddev
->resync_max
> j
6936 || kthread_should_stop());
6939 if (kthread_should_stop())
6942 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
6943 currspeed
< speed_min(mddev
));
6945 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6949 if (!skipped
) { /* actual IO requested */
6950 io_sectors
+= sectors
;
6951 atomic_add(sectors
, &mddev
->recovery_active
);
6955 if (j
>1) mddev
->curr_resync
= j
;
6956 mddev
->curr_mark_cnt
= io_sectors
;
6957 if (last_check
== 0)
6958 /* this is the earliers that rebuilt will be
6959 * visible in /proc/mdstat
6961 md_new_event(mddev
);
6963 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
6966 last_check
= io_sectors
;
6968 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
6972 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
6974 int next
= (last_mark
+1) % SYNC_MARKS
;
6976 mddev
->resync_mark
= mark
[next
];
6977 mddev
->resync_mark_cnt
= mark_cnt
[next
];
6978 mark
[next
] = jiffies
;
6979 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
6984 if (kthread_should_stop())
6989 * this loop exits only if either when we are slower than
6990 * the 'hard' speed limit, or the system was IO-idle for
6992 * the system might be non-idle CPU-wise, but we only care
6993 * about not overloading the IO subsystem. (things like an
6994 * e2fsck being done on the RAID array should execute fast)
6998 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
6999 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7001 if (currspeed
> speed_min(mddev
)) {
7002 if ((currspeed
> speed_max(mddev
)) ||
7003 !is_mddev_idle(mddev
, 0)) {
7009 printk(KERN_INFO
"md: %s: %s done.\n",mdname(mddev
), desc
);
7011 * this also signals 'finished resyncing' to md_stop
7014 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7016 /* tell personality that we are finished */
7017 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7019 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7020 mddev
->curr_resync
> 2) {
7021 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7022 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7023 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7025 "md: checkpointing %s of %s.\n",
7026 desc
, mdname(mddev
));
7027 mddev
->recovery_cp
= mddev
->curr_resync
;
7030 mddev
->recovery_cp
= MaxSector
;
7032 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7033 mddev
->curr_resync
= MaxSector
;
7035 list_for_each_entry_rcu(rdev
, &mddev
->disks
, same_set
)
7036 if (rdev
->raid_disk
>= 0 &&
7037 mddev
->delta_disks
>= 0 &&
7038 !test_bit(Faulty
, &rdev
->flags
) &&
7039 !test_bit(In_sync
, &rdev
->flags
) &&
7040 rdev
->recovery_offset
< mddev
->curr_resync
)
7041 rdev
->recovery_offset
= mddev
->curr_resync
;
7045 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7048 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7049 /* We completed so min/max setting can be forgotten if used. */
7050 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7051 mddev
->resync_min
= 0;
7052 mddev
->resync_max
= MaxSector
;
7053 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7054 mddev
->resync_min
= mddev
->curr_resync_completed
;
7055 mddev
->curr_resync
= 0;
7056 wake_up(&resync_wait
);
7057 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7058 md_wakeup_thread(mddev
->thread
);
7063 * got a signal, exit.
7066 "md: md_do_sync() got signal ... exiting\n");
7067 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7071 EXPORT_SYMBOL_GPL(md_do_sync
);
7073 static int remove_and_add_spares(mddev_t
*mddev
)
7078 mddev
->curr_resync_completed
= 0;
7080 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7081 if (rdev
->raid_disk
>= 0 &&
7082 !test_bit(Blocked
, &rdev
->flags
) &&
7083 (test_bit(Faulty
, &rdev
->flags
) ||
7084 ! test_bit(In_sync
, &rdev
->flags
)) &&
7085 atomic_read(&rdev
->nr_pending
)==0) {
7086 if (mddev
->pers
->hot_remove_disk(
7087 mddev
, rdev
->raid_disk
)==0) {
7088 sysfs_unlink_rdev(mddev
, rdev
);
7089 rdev
->raid_disk
= -1;
7093 if (mddev
->degraded
) {
7094 list_for_each_entry(rdev
, &mddev
->disks
, same_set
) {
7095 if (rdev
->raid_disk
>= 0 &&
7096 !test_bit(In_sync
, &rdev
->flags
) &&
7097 !test_bit(Faulty
, &rdev
->flags
) &&
7098 !test_bit(Blocked
, &rdev
->flags
))
7100 if (rdev
->raid_disk
< 0
7101 && !test_bit(Faulty
, &rdev
->flags
)) {
7102 rdev
->recovery_offset
= 0;
7104 hot_add_disk(mddev
, rdev
) == 0) {
7105 if (sysfs_link_rdev(mddev
, rdev
))
7106 /* failure here is OK */;
7108 md_new_event(mddev
);
7109 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7118 static void reap_sync_thread(mddev_t
*mddev
)
7122 /* resync has finished, collect result */
7123 md_unregister_thread(mddev
->sync_thread
);
7124 mddev
->sync_thread
= NULL
;
7125 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7126 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7128 /* activate any spares */
7129 if (mddev
->pers
->spare_active(mddev
))
7130 sysfs_notify(&mddev
->kobj
, NULL
,
7133 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7134 mddev
->pers
->finish_reshape
)
7135 mddev
->pers
->finish_reshape(mddev
);
7136 md_update_sb(mddev
, 1);
7138 /* if array is no-longer degraded, then any saved_raid_disk
7139 * information must be scrapped
7141 if (!mddev
->degraded
)
7142 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7143 rdev
->saved_raid_disk
= -1;
7145 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7146 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7147 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7148 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7149 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7150 /* flag recovery needed just to double check */
7151 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7152 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7153 md_new_event(mddev
);
7154 if (mddev
->event_work
.func
)
7155 queue_work(md_misc_wq
, &mddev
->event_work
);
7159 * This routine is regularly called by all per-raid-array threads to
7160 * deal with generic issues like resync and super-block update.
7161 * Raid personalities that don't have a thread (linear/raid0) do not
7162 * need this as they never do any recovery or update the superblock.
7164 * It does not do any resync itself, but rather "forks" off other threads
7165 * to do that as needed.
7166 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7167 * "->recovery" and create a thread at ->sync_thread.
7168 * When the thread finishes it sets MD_RECOVERY_DONE
7169 * and wakeups up this thread which will reap the thread and finish up.
7170 * This thread also removes any faulty devices (with nr_pending == 0).
7172 * The overall approach is:
7173 * 1/ if the superblock needs updating, update it.
7174 * 2/ If a recovery thread is running, don't do anything else.
7175 * 3/ If recovery has finished, clean up, possibly marking spares active.
7176 * 4/ If there are any faulty devices, remove them.
7177 * 5/ If array is degraded, try to add spares devices
7178 * 6/ If array has spares or is not in-sync, start a resync thread.
7180 void md_check_recovery(mddev_t
*mddev
)
7182 if (mddev
->suspended
)
7186 bitmap_daemon_work(mddev
);
7188 if (signal_pending(current
)) {
7189 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7190 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7192 mddev
->safemode
= 2;
7194 flush_signals(current
);
7197 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7200 (mddev
->flags
& ~ (1<<MD_CHANGE_PENDING
)) ||
7201 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7202 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7203 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7204 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7205 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7209 if (mddev_trylock(mddev
)) {
7213 /* Only thing we do on a ro array is remove
7217 list_for_each_entry(rdev
, &mddev
->disks
, same_set
)
7218 if (rdev
->raid_disk
>= 0 &&
7219 !test_bit(Blocked
, &rdev
->flags
) &&
7220 test_bit(Faulty
, &rdev
->flags
) &&
7221 atomic_read(&rdev
->nr_pending
)==0) {
7222 if (mddev
->pers
->hot_remove_disk(
7223 mddev
, rdev
->raid_disk
)==0) {
7224 sysfs_unlink_rdev(mddev
, rdev
);
7225 rdev
->raid_disk
= -1;
7228 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7232 if (!mddev
->external
) {
7234 spin_lock_irq(&mddev
->write_lock
);
7235 if (mddev
->safemode
&&
7236 !atomic_read(&mddev
->writes_pending
) &&
7238 mddev
->recovery_cp
== MaxSector
) {
7241 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7243 if (mddev
->safemode
== 1)
7244 mddev
->safemode
= 0;
7245 spin_unlock_irq(&mddev
->write_lock
);
7247 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7251 md_update_sb(mddev
, 0);
7253 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7254 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7255 /* resync/recovery still happening */
7256 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7259 if (mddev
->sync_thread
) {
7260 reap_sync_thread(mddev
);
7263 /* Set RUNNING before clearing NEEDED to avoid
7264 * any transients in the value of "sync_action".
7266 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7267 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7268 /* Clear some bits that don't mean anything, but
7271 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7272 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7274 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7276 /* no recovery is running.
7277 * remove any failed drives, then
7278 * add spares if possible.
7279 * Spare are also removed and re-added, to allow
7280 * the personality to fail the re-add.
7283 if (mddev
->reshape_position
!= MaxSector
) {
7284 if (mddev
->pers
->check_reshape
== NULL
||
7285 mddev
->pers
->check_reshape(mddev
) != 0)
7286 /* Cannot proceed */
7288 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7289 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7290 } else if ((spares
= remove_and_add_spares(mddev
))) {
7291 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7292 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7293 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7294 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7295 } else if (mddev
->recovery_cp
< MaxSector
) {
7296 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7297 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7298 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7299 /* nothing to be done ... */
7302 if (mddev
->pers
->sync_request
) {
7303 if (spares
&& mddev
->bitmap
&& ! mddev
->bitmap
->file
) {
7304 /* We are adding a device or devices to an array
7305 * which has the bitmap stored on all devices.
7306 * So make sure all bitmap pages get written
7308 bitmap_write_all(mddev
->bitmap
);
7310 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7313 if (!mddev
->sync_thread
) {
7314 printk(KERN_ERR
"%s: could not start resync"
7317 /* leave the spares where they are, it shouldn't hurt */
7318 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7319 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7320 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7321 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7322 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7324 md_wakeup_thread(mddev
->sync_thread
);
7325 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7326 md_new_event(mddev
);
7329 if (!mddev
->sync_thread
) {
7330 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7331 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7333 if (mddev
->sysfs_action
)
7334 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7336 mddev_unlock(mddev
);
7340 void md_wait_for_blocked_rdev(mdk_rdev_t
*rdev
, mddev_t
*mddev
)
7342 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7343 wait_event_timeout(rdev
->blocked_wait
,
7344 !test_bit(Blocked
, &rdev
->flags
),
7345 msecs_to_jiffies(5000));
7346 rdev_dec_pending(rdev
, mddev
);
7348 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7351 /* Bad block management.
7352 * We can record which blocks on each device are 'bad' and so just
7353 * fail those blocks, or that stripe, rather than the whole device.
7354 * Entries in the bad-block table are 64bits wide. This comprises:
7355 * Length of bad-range, in sectors: 0-511 for lengths 1-512
7356 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
7357 * A 'shift' can be set so that larger blocks are tracked and
7358 * consequently larger devices can be covered.
7359 * 'Acknowledged' flag - 1 bit. - the most significant bit.
7361 * Locking of the bad-block table uses a seqlock so md_is_badblock
7362 * might need to retry if it is very unlucky.
7363 * We will sometimes want to check for bad blocks in a bi_end_io function,
7364 * so we use the write_seqlock_irq variant.
7366 * When looking for a bad block we specify a range and want to
7367 * know if any block in the range is bad. So we binary-search
7368 * to the last range that starts at-or-before the given endpoint,
7369 * (or "before the sector after the target range")
7370 * then see if it ends after the given start.
7372 * 0 if there are no known bad blocks in the range
7373 * 1 if there are known bad block which are all acknowledged
7374 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
7375 * plus the start/length of the first bad section we overlap.
7377 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
7378 sector_t
*first_bad
, int *bad_sectors
)
7384 sector_t target
= s
+ sectors
;
7387 if (bb
->shift
> 0) {
7388 /* round the start down, and the end up */
7390 target
+= (1<<bb
->shift
) - 1;
7391 target
>>= bb
->shift
;
7392 sectors
= target
- s
;
7394 /* 'target' is now the first block after the bad range */
7397 seq
= read_seqbegin(&bb
->lock
);
7401 /* Binary search between lo and hi for 'target'
7402 * i.e. for the last range that starts before 'target'
7404 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
7405 * are known not to be the last range before target.
7406 * VARIANT: hi-lo is the number of possible
7407 * ranges, and decreases until it reaches 1
7409 while (hi
- lo
> 1) {
7410 int mid
= (lo
+ hi
) / 2;
7411 sector_t a
= BB_OFFSET(p
[mid
]);
7413 /* This could still be the one, earlier ranges
7417 /* This and later ranges are definitely out. */
7420 /* 'lo' might be the last that started before target, but 'hi' isn't */
7422 /* need to check all range that end after 's' to see if
7423 * any are unacknowledged.
7426 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7427 if (BB_OFFSET(p
[lo
]) < target
) {
7428 /* starts before the end, and finishes after
7429 * the start, so they must overlap
7431 if (rv
!= -1 && BB_ACK(p
[lo
]))
7435 *first_bad
= BB_OFFSET(p
[lo
]);
7436 *bad_sectors
= BB_LEN(p
[lo
]);
7442 if (read_seqretry(&bb
->lock
, seq
))
7447 EXPORT_SYMBOL_GPL(md_is_badblock
);
7450 * Add a range of bad blocks to the table.
7451 * This might extend the table, or might contract it
7452 * if two adjacent ranges can be merged.
7453 * We binary-search to find the 'insertion' point, then
7454 * decide how best to handle it.
7456 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
7464 /* badblocks are disabled */
7468 /* round the start down, and the end up */
7469 sector_t next
= s
+ sectors
;
7471 next
+= (1<<bb
->shift
) - 1;
7476 write_seqlock_irq(&bb
->lock
);
7481 /* Find the last range that starts at-or-before 's' */
7482 while (hi
- lo
> 1) {
7483 int mid
= (lo
+ hi
) / 2;
7484 sector_t a
= BB_OFFSET(p
[mid
]);
7490 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
7494 /* we found a range that might merge with the start
7497 sector_t a
= BB_OFFSET(p
[lo
]);
7498 sector_t e
= a
+ BB_LEN(p
[lo
]);
7499 int ack
= BB_ACK(p
[lo
]);
7501 /* Yes, we can merge with a previous range */
7502 if (s
== a
&& s
+ sectors
>= e
)
7503 /* new range covers old */
7506 ack
= ack
&& acknowledged
;
7508 if (e
< s
+ sectors
)
7510 if (e
- a
<= BB_MAX_LEN
) {
7511 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
7514 /* does not all fit in one range,
7515 * make p[lo] maximal
7517 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
7518 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
7524 if (sectors
&& hi
< bb
->count
) {
7525 /* 'hi' points to the first range that starts after 's'.
7526 * Maybe we can merge with the start of that range */
7527 sector_t a
= BB_OFFSET(p
[hi
]);
7528 sector_t e
= a
+ BB_LEN(p
[hi
]);
7529 int ack
= BB_ACK(p
[hi
]);
7530 if (a
<= s
+ sectors
) {
7531 /* merging is possible */
7532 if (e
<= s
+ sectors
) {
7537 ack
= ack
&& acknowledged
;
7540 if (e
- a
<= BB_MAX_LEN
) {
7541 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
7544 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
7552 if (sectors
== 0 && hi
< bb
->count
) {
7553 /* we might be able to combine lo and hi */
7554 /* Note: 's' is at the end of 'lo' */
7555 sector_t a
= BB_OFFSET(p
[hi
]);
7556 int lolen
= BB_LEN(p
[lo
]);
7557 int hilen
= BB_LEN(p
[hi
]);
7558 int newlen
= lolen
+ hilen
- (s
- a
);
7559 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
7560 /* yes, we can combine them */
7561 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
7562 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
7563 memmove(p
+ hi
, p
+ hi
+ 1,
7564 (bb
->count
- hi
- 1) * 8);
7569 /* didn't merge (it all).
7570 * Need to add a range just before 'hi' */
7571 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
7572 /* No room for more */
7576 int this_sectors
= sectors
;
7577 memmove(p
+ hi
+ 1, p
+ hi
,
7578 (bb
->count
- hi
) * 8);
7581 if (this_sectors
> BB_MAX_LEN
)
7582 this_sectors
= BB_MAX_LEN
;
7583 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
7584 sectors
-= this_sectors
;
7590 write_sequnlock_irq(&bb
->lock
);
7595 int rdev_set_badblocks(mdk_rdev_t
*rdev
, sector_t s
, int sectors
,
7598 int rv
= md_set_badblocks(&rdev
->badblocks
,
7599 s
+ rdev
->data_offset
, sectors
, acknowledged
);
7601 /* Make sure they get written out promptly */
7602 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
7603 md_wakeup_thread(rdev
->mddev
->thread
);
7607 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
7610 * Remove a range of bad blocks from the table.
7611 * This may involve extending the table if we spilt a region,
7612 * but it must not fail. So if the table becomes full, we just
7613 * drop the remove request.
7615 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
7619 sector_t target
= s
+ sectors
;
7622 if (bb
->shift
> 0) {
7623 /* When clearing we round the start up and the end down.
7624 * This should not matter as the shift should align with
7625 * the block size and no rounding should ever be needed.
7626 * However it is better the think a block is bad when it
7627 * isn't than to think a block is not bad when it is.
7629 s
+= (1<<bb
->shift
) - 1;
7631 target
>>= bb
->shift
;
7632 sectors
= target
- s
;
7635 write_seqlock_irq(&bb
->lock
);
7640 /* Find the last range that starts before 'target' */
7641 while (hi
- lo
> 1) {
7642 int mid
= (lo
+ hi
) / 2;
7643 sector_t a
= BB_OFFSET(p
[mid
]);
7650 /* p[lo] is the last range that could overlap the
7651 * current range. Earlier ranges could also overlap,
7652 * but only this one can overlap the end of the range.
7654 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
7655 /* Partial overlap, leave the tail of this range */
7656 int ack
= BB_ACK(p
[lo
]);
7657 sector_t a
= BB_OFFSET(p
[lo
]);
7658 sector_t end
= a
+ BB_LEN(p
[lo
]);
7661 /* we need to split this range */
7662 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
7666 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
7668 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
7671 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
7672 /* there is no longer an overlap */
7677 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
7678 /* This range does overlap */
7679 if (BB_OFFSET(p
[lo
]) < s
) {
7680 /* Keep the early parts of this range. */
7681 int ack
= BB_ACK(p
[lo
]);
7682 sector_t start
= BB_OFFSET(p
[lo
]);
7683 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
7684 /* now low doesn't overlap, so.. */
7689 /* 'lo' is strictly before, 'hi' is strictly after,
7690 * anything between needs to be discarded
7693 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
7694 bb
->count
-= (hi
- lo
- 1);
7700 write_sequnlock_irq(&bb
->lock
);
7704 int rdev_clear_badblocks(mdk_rdev_t
*rdev
, sector_t s
, int sectors
)
7706 return md_clear_badblocks(&rdev
->badblocks
,
7707 s
+ rdev
->data_offset
,
7710 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
7713 * Acknowledge all bad blocks in a list.
7714 * This only succeeds if ->changed is clear. It is used by
7715 * in-kernel metadata updates
7717 void md_ack_all_badblocks(struct badblocks
*bb
)
7719 if (bb
->page
== NULL
|| bb
->changed
)
7720 /* no point even trying */
7722 write_seqlock_irq(&bb
->lock
);
7724 if (bb
->changed
== 0) {
7727 for (i
= 0; i
< bb
->count
; i
++) {
7728 if (!BB_ACK(p
[i
])) {
7729 sector_t start
= BB_OFFSET(p
[i
]);
7730 int len
= BB_LEN(p
[i
]);
7731 p
[i
] = BB_MAKE(start
, len
, 1);
7735 write_sequnlock_irq(&bb
->lock
);
7737 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
7739 static int md_notify_reboot(struct notifier_block
*this,
7740 unsigned long code
, void *x
)
7742 struct list_head
*tmp
;
7745 if ((code
== SYS_DOWN
) || (code
== SYS_HALT
) || (code
== SYS_POWER_OFF
)) {
7747 printk(KERN_INFO
"md: stopping all md devices.\n");
7749 for_each_mddev(mddev
, tmp
)
7750 if (mddev_trylock(mddev
)) {
7751 /* Force a switch to readonly even array
7752 * appears to still be in use. Hence
7755 md_set_readonly(mddev
, 100);
7756 mddev_unlock(mddev
);
7759 * certain more exotic SCSI devices are known to be
7760 * volatile wrt too early system reboots. While the
7761 * right place to handle this issue is the given
7762 * driver, we do want to have a safe RAID driver ...
7769 static struct notifier_block md_notifier
= {
7770 .notifier_call
= md_notify_reboot
,
7772 .priority
= INT_MAX
, /* before any real devices */
7775 static void md_geninit(void)
7777 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
7779 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
7782 static int __init
md_init(void)
7786 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
7790 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
7794 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
7797 if ((ret
= register_blkdev(0, "mdp")) < 0)
7801 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7802 md_probe
, NULL
, NULL
);
7803 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
7804 md_probe
, NULL
, NULL
);
7806 register_reboot_notifier(&md_notifier
);
7807 raid_table_header
= register_sysctl_table(raid_root_table
);
7813 unregister_blkdev(MD_MAJOR
, "md");
7815 destroy_workqueue(md_misc_wq
);
7817 destroy_workqueue(md_wq
);
7825 * Searches all registered partitions for autorun RAID arrays
7829 static LIST_HEAD(all_detected_devices
);
7830 struct detected_devices_node
{
7831 struct list_head list
;
7835 void md_autodetect_dev(dev_t dev
)
7837 struct detected_devices_node
*node_detected_dev
;
7839 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
7840 if (node_detected_dev
) {
7841 node_detected_dev
->dev
= dev
;
7842 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
7844 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
7845 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
7850 static void autostart_arrays(int part
)
7853 struct detected_devices_node
*node_detected_dev
;
7855 int i_scanned
, i_passed
;
7860 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
7862 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
7864 node_detected_dev
= list_entry(all_detected_devices
.next
,
7865 struct detected_devices_node
, list
);
7866 list_del(&node_detected_dev
->list
);
7867 dev
= node_detected_dev
->dev
;
7868 kfree(node_detected_dev
);
7869 rdev
= md_import_device(dev
,0, 90);
7873 if (test_bit(Faulty
, &rdev
->flags
)) {
7877 set_bit(AutoDetected
, &rdev
->flags
);
7878 list_add(&rdev
->same_set
, &pending_raid_disks
);
7882 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
7883 i_scanned
, i_passed
);
7885 autorun_devices(part
);
7888 #endif /* !MODULE */
7890 static __exit
void md_exit(void)
7893 struct list_head
*tmp
;
7895 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
7896 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
7898 unregister_blkdev(MD_MAJOR
,"md");
7899 unregister_blkdev(mdp_major
, "mdp");
7900 unregister_reboot_notifier(&md_notifier
);
7901 unregister_sysctl_table(raid_table_header
);
7902 remove_proc_entry("mdstat", NULL
);
7903 for_each_mddev(mddev
, tmp
) {
7904 export_array(mddev
);
7905 mddev
->hold_active
= 0;
7907 destroy_workqueue(md_misc_wq
);
7908 destroy_workqueue(md_wq
);
7911 subsys_initcall(md_init
);
7912 module_exit(md_exit
)
7914 static int get_ro(char *buffer
, struct kernel_param
*kp
)
7916 return sprintf(buffer
, "%d", start_readonly
);
7918 static int set_ro(const char *val
, struct kernel_param
*kp
)
7921 int num
= simple_strtoul(val
, &e
, 10);
7922 if (*val
&& (*e
== '\0' || *e
== '\n')) {
7923 start_readonly
= num
;
7929 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
7930 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
7932 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
7934 EXPORT_SYMBOL(register_md_personality
);
7935 EXPORT_SYMBOL(unregister_md_personality
);
7936 EXPORT_SYMBOL(md_error
);
7937 EXPORT_SYMBOL(md_done_sync
);
7938 EXPORT_SYMBOL(md_write_start
);
7939 EXPORT_SYMBOL(md_write_end
);
7940 EXPORT_SYMBOL(md_register_thread
);
7941 EXPORT_SYMBOL(md_unregister_thread
);
7942 EXPORT_SYMBOL(md_wakeup_thread
);
7943 EXPORT_SYMBOL(md_check_recovery
);
7944 MODULE_LICENSE("GPL");
7945 MODULE_DESCRIPTION("MD RAID framework");
7947 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);