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>
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/string.h>
43 #include <linux/hdreg.h>
44 #include <linux/proc_fs.h>
45 #include <linux/random.h>
46 #include <linux/module.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 static void autostart_arrays(int part
);
61 /* pers_list is a list of registered personalities protected
63 * pers_lock does extra service to protect accesses to
64 * mddev->thread when the mutex cannot be held.
66 static LIST_HEAD(pers_list
);
67 static DEFINE_SPINLOCK(pers_lock
);
69 static void md_print_devices(void);
71 static DECLARE_WAIT_QUEUE_HEAD(resync_wait
);
72 static struct workqueue_struct
*md_wq
;
73 static struct workqueue_struct
*md_misc_wq
;
75 static int remove_and_add_spares(struct mddev
*mddev
,
76 struct md_rdev
*this);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Default number of read corrections we'll attempt on an rdev
82 * before ejecting it from the array. We divide the read error
83 * count by 2 for every hour elapsed between read errors.
85 #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20
87 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
88 * is 1000 KB/sec, so the extra system load does not show up that much.
89 * Increase it if you want to have more _guaranteed_ speed. Note that
90 * the RAID driver will use the maximum available bandwidth if the IO
91 * subsystem is idle. There is also an 'absolute maximum' reconstruction
92 * speed limit - in case reconstruction slows down your system despite
95 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
96 * or /sys/block/mdX/md/sync_speed_{min,max}
99 static int sysctl_speed_limit_min
= 1000;
100 static int sysctl_speed_limit_max
= 200000;
101 static inline int speed_min(struct mddev
*mddev
)
103 return mddev
->sync_speed_min
?
104 mddev
->sync_speed_min
: sysctl_speed_limit_min
;
107 static inline int speed_max(struct mddev
*mddev
)
109 return mddev
->sync_speed_max
?
110 mddev
->sync_speed_max
: sysctl_speed_limit_max
;
113 static struct ctl_table_header
*raid_table_header
;
115 static struct ctl_table raid_table
[] = {
117 .procname
= "speed_limit_min",
118 .data
= &sysctl_speed_limit_min
,
119 .maxlen
= sizeof(int),
120 .mode
= S_IRUGO
|S_IWUSR
,
121 .proc_handler
= proc_dointvec
,
124 .procname
= "speed_limit_max",
125 .data
= &sysctl_speed_limit_max
,
126 .maxlen
= sizeof(int),
127 .mode
= S_IRUGO
|S_IWUSR
,
128 .proc_handler
= proc_dointvec
,
133 static struct ctl_table raid_dir_table
[] = {
137 .mode
= S_IRUGO
|S_IXUGO
,
143 static struct ctl_table raid_root_table
[] = {
148 .child
= raid_dir_table
,
153 static const struct block_device_operations md_fops
;
155 static int start_readonly
;
158 * like bio_clone, but with a local bio set
161 struct bio
*bio_alloc_mddev(gfp_t gfp_mask
, int nr_iovecs
,
166 if (!mddev
|| !mddev
->bio_set
)
167 return bio_alloc(gfp_mask
, nr_iovecs
);
169 b
= bio_alloc_bioset(gfp_mask
, nr_iovecs
, mddev
->bio_set
);
174 EXPORT_SYMBOL_GPL(bio_alloc_mddev
);
176 struct bio
*bio_clone_mddev(struct bio
*bio
, gfp_t gfp_mask
,
179 if (!mddev
|| !mddev
->bio_set
)
180 return bio_clone(bio
, gfp_mask
);
182 return bio_clone_bioset(bio
, gfp_mask
, mddev
->bio_set
);
184 EXPORT_SYMBOL_GPL(bio_clone_mddev
);
187 * We have a system wide 'event count' that is incremented
188 * on any 'interesting' event, and readers of /proc/mdstat
189 * can use 'poll' or 'select' to find out when the event
193 * start array, stop array, error, add device, remove device,
194 * start build, activate spare
196 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters
);
197 static atomic_t md_event_count
;
198 void md_new_event(struct mddev
*mddev
)
200 atomic_inc(&md_event_count
);
201 wake_up(&md_event_waiters
);
203 EXPORT_SYMBOL_GPL(md_new_event
);
205 /* Alternate version that can be called from interrupts
206 * when calling sysfs_notify isn't needed.
208 static void md_new_event_inintr(struct mddev
*mddev
)
210 atomic_inc(&md_event_count
);
211 wake_up(&md_event_waiters
);
215 * Enables to iterate over all existing md arrays
216 * all_mddevs_lock protects this list.
218 static LIST_HEAD(all_mddevs
);
219 static DEFINE_SPINLOCK(all_mddevs_lock
);
222 * iterates through all used mddevs in the system.
223 * We take care to grab the all_mddevs_lock whenever navigating
224 * the list, and to always hold a refcount when unlocked.
225 * Any code which breaks out of this loop while own
226 * a reference to the current mddev and must mddev_put it.
228 #define for_each_mddev(_mddev,_tmp) \
230 for (({ spin_lock(&all_mddevs_lock); \
231 _tmp = all_mddevs.next; \
233 ({ if (_tmp != &all_mddevs) \
234 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
235 spin_unlock(&all_mddevs_lock); \
236 if (_mddev) mddev_put(_mddev); \
237 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
238 _tmp != &all_mddevs;}); \
239 ({ spin_lock(&all_mddevs_lock); \
240 _tmp = _tmp->next;}) \
243 /* Rather than calling directly into the personality make_request function,
244 * IO requests come here first so that we can check if the device is
245 * being suspended pending a reconfiguration.
246 * We hold a refcount over the call to ->make_request. By the time that
247 * call has finished, the bio has been linked into some internal structure
248 * and so is visible to ->quiesce(), so we don't need the refcount any more.
250 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
252 const int rw
= bio_data_dir(bio
);
253 struct mddev
*mddev
= q
->queuedata
;
255 unsigned int sectors
;
257 if (mddev
== NULL
|| mddev
->pers
== NULL
262 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
263 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
266 smp_rmb(); /* Ensure implications of 'active' are visible */
268 if (mddev
->suspended
) {
271 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
272 TASK_UNINTERRUPTIBLE
);
273 if (!mddev
->suspended
)
279 finish_wait(&mddev
->sb_wait
, &__wait
);
281 atomic_inc(&mddev
->active_io
);
285 * save the sectors now since our bio can
286 * go away inside make_request
288 sectors
= bio_sectors(bio
);
289 mddev
->pers
->make_request(mddev
, bio
);
291 cpu
= part_stat_lock();
292 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
293 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
296 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
297 wake_up(&mddev
->sb_wait
);
300 /* mddev_suspend makes sure no new requests are submitted
301 * to the device, and that any requests that have been submitted
302 * are completely handled.
303 * Once ->stop is called and completes, the module will be completely
306 void mddev_suspend(struct mddev
*mddev
)
308 BUG_ON(mddev
->suspended
);
309 mddev
->suspended
= 1;
311 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
312 mddev
->pers
->quiesce(mddev
, 1);
314 del_timer_sync(&mddev
->safemode_timer
);
316 EXPORT_SYMBOL_GPL(mddev_suspend
);
318 void mddev_resume(struct mddev
*mddev
)
320 mddev
->suspended
= 0;
321 wake_up(&mddev
->sb_wait
);
322 mddev
->pers
->quiesce(mddev
, 0);
324 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
325 md_wakeup_thread(mddev
->thread
);
326 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
328 EXPORT_SYMBOL_GPL(mddev_resume
);
330 int mddev_congested(struct mddev
*mddev
, int bits
)
332 return mddev
->suspended
;
334 EXPORT_SYMBOL(mddev_congested
);
337 * Generic flush handling for md
340 static void md_end_flush(struct bio
*bio
, int err
)
342 struct md_rdev
*rdev
= bio
->bi_private
;
343 struct mddev
*mddev
= rdev
->mddev
;
345 rdev_dec_pending(rdev
, mddev
);
347 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
348 /* The pre-request flush has finished */
349 queue_work(md_wq
, &mddev
->flush_work
);
354 static void md_submit_flush_data(struct work_struct
*ws
);
356 static void submit_flushes(struct work_struct
*ws
)
358 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
359 struct md_rdev
*rdev
;
361 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
362 atomic_set(&mddev
->flush_pending
, 1);
364 rdev_for_each_rcu(rdev
, mddev
)
365 if (rdev
->raid_disk
>= 0 &&
366 !test_bit(Faulty
, &rdev
->flags
)) {
367 /* Take two references, one is dropped
368 * when request finishes, one after
369 * we reclaim rcu_read_lock
372 atomic_inc(&rdev
->nr_pending
);
373 atomic_inc(&rdev
->nr_pending
);
375 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
376 bi
->bi_end_io
= md_end_flush
;
377 bi
->bi_private
= rdev
;
378 bi
->bi_bdev
= rdev
->bdev
;
379 atomic_inc(&mddev
->flush_pending
);
380 submit_bio(WRITE_FLUSH
, bi
);
382 rdev_dec_pending(rdev
, mddev
);
385 if (atomic_dec_and_test(&mddev
->flush_pending
))
386 queue_work(md_wq
, &mddev
->flush_work
);
389 static void md_submit_flush_data(struct work_struct
*ws
)
391 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
392 struct bio
*bio
= mddev
->flush_bio
;
394 if (bio
->bi_iter
.bi_size
== 0)
395 /* an empty barrier - all done */
398 bio
->bi_rw
&= ~REQ_FLUSH
;
399 mddev
->pers
->make_request(mddev
, bio
);
402 mddev
->flush_bio
= NULL
;
403 wake_up(&mddev
->sb_wait
);
406 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
408 spin_lock_irq(&mddev
->write_lock
);
409 wait_event_lock_irq(mddev
->sb_wait
,
412 mddev
->flush_bio
= bio
;
413 spin_unlock_irq(&mddev
->write_lock
);
415 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
416 queue_work(md_wq
, &mddev
->flush_work
);
418 EXPORT_SYMBOL(md_flush_request
);
420 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
422 struct mddev
*mddev
= cb
->data
;
423 md_wakeup_thread(mddev
->thread
);
426 EXPORT_SYMBOL(md_unplug
);
428 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
430 atomic_inc(&mddev
->active
);
434 static void mddev_delayed_delete(struct work_struct
*ws
);
436 static void mddev_put(struct mddev
*mddev
)
438 struct bio_set
*bs
= NULL
;
440 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
442 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
443 mddev
->ctime
== 0 && !mddev
->hold_active
) {
444 /* Array is not configured at all, and not held active,
446 list_del_init(&mddev
->all_mddevs
);
448 mddev
->bio_set
= NULL
;
449 if (mddev
->gendisk
) {
450 /* We did a probe so need to clean up. Call
451 * queue_work inside the spinlock so that
452 * flush_workqueue() after mddev_find will
453 * succeed in waiting for the work to be done.
455 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
456 queue_work(md_misc_wq
, &mddev
->del_work
);
460 spin_unlock(&all_mddevs_lock
);
465 void mddev_init(struct mddev
*mddev
)
467 mutex_init(&mddev
->open_mutex
);
468 mutex_init(&mddev
->reconfig_mutex
);
469 mutex_init(&mddev
->bitmap_info
.mutex
);
470 INIT_LIST_HEAD(&mddev
->disks
);
471 INIT_LIST_HEAD(&mddev
->all_mddevs
);
472 init_timer(&mddev
->safemode_timer
);
473 atomic_set(&mddev
->active
, 1);
474 atomic_set(&mddev
->openers
, 0);
475 atomic_set(&mddev
->active_io
, 0);
476 spin_lock_init(&mddev
->write_lock
);
477 atomic_set(&mddev
->flush_pending
, 0);
478 init_waitqueue_head(&mddev
->sb_wait
);
479 init_waitqueue_head(&mddev
->recovery_wait
);
480 mddev
->reshape_position
= MaxSector
;
481 mddev
->reshape_backwards
= 0;
482 mddev
->last_sync_action
= "none";
483 mddev
->resync_min
= 0;
484 mddev
->resync_max
= MaxSector
;
485 mddev
->level
= LEVEL_NONE
;
487 EXPORT_SYMBOL_GPL(mddev_init
);
489 static struct mddev
*mddev_find(dev_t unit
)
491 struct mddev
*mddev
, *new = NULL
;
493 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
494 unit
&= ~((1<<MdpMinorShift
)-1);
497 spin_lock(&all_mddevs_lock
);
500 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
501 if (mddev
->unit
== unit
) {
503 spin_unlock(&all_mddevs_lock
);
509 list_add(&new->all_mddevs
, &all_mddevs
);
510 spin_unlock(&all_mddevs_lock
);
511 new->hold_active
= UNTIL_IOCTL
;
515 /* find an unused unit number */
516 static int next_minor
= 512;
517 int start
= next_minor
;
521 dev
= MKDEV(MD_MAJOR
, next_minor
);
523 if (next_minor
> MINORMASK
)
525 if (next_minor
== start
) {
526 /* Oh dear, all in use. */
527 spin_unlock(&all_mddevs_lock
);
533 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
534 if (mddev
->unit
== dev
) {
540 new->md_minor
= MINOR(dev
);
541 new->hold_active
= UNTIL_STOP
;
542 list_add(&new->all_mddevs
, &all_mddevs
);
543 spin_unlock(&all_mddevs_lock
);
546 spin_unlock(&all_mddevs_lock
);
548 new = kzalloc(sizeof(*new), GFP_KERNEL
);
553 if (MAJOR(unit
) == MD_MAJOR
)
554 new->md_minor
= MINOR(unit
);
556 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
563 static inline int __must_check
mddev_lock(struct mddev
*mddev
)
565 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
568 /* Sometimes we need to take the lock in a situation where
569 * failure due to interrupts is not acceptable.
571 static inline void mddev_lock_nointr(struct mddev
*mddev
)
573 mutex_lock(&mddev
->reconfig_mutex
);
576 static inline int mddev_is_locked(struct mddev
*mddev
)
578 return mutex_is_locked(&mddev
->reconfig_mutex
);
581 static inline int mddev_trylock(struct mddev
*mddev
)
583 return mutex_trylock(&mddev
->reconfig_mutex
);
586 static struct attribute_group md_redundancy_group
;
588 static void mddev_unlock(struct mddev
*mddev
)
590 if (mddev
->to_remove
) {
591 /* These cannot be removed under reconfig_mutex as
592 * an access to the files will try to take reconfig_mutex
593 * while holding the file unremovable, which leads to
595 * So hold set sysfs_active while the remove in happeing,
596 * and anything else which might set ->to_remove or my
597 * otherwise change the sysfs namespace will fail with
598 * -EBUSY if sysfs_active is still set.
599 * We set sysfs_active under reconfig_mutex and elsewhere
600 * test it under the same mutex to ensure its correct value
603 struct attribute_group
*to_remove
= mddev
->to_remove
;
604 mddev
->to_remove
= NULL
;
605 mddev
->sysfs_active
= 1;
606 mutex_unlock(&mddev
->reconfig_mutex
);
608 if (mddev
->kobj
.sd
) {
609 if (to_remove
!= &md_redundancy_group
)
610 sysfs_remove_group(&mddev
->kobj
, to_remove
);
611 if (mddev
->pers
== NULL
||
612 mddev
->pers
->sync_request
== NULL
) {
613 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
614 if (mddev
->sysfs_action
)
615 sysfs_put(mddev
->sysfs_action
);
616 mddev
->sysfs_action
= NULL
;
619 mddev
->sysfs_active
= 0;
621 mutex_unlock(&mddev
->reconfig_mutex
);
623 /* As we've dropped the mutex we need a spinlock to
624 * make sure the thread doesn't disappear
626 spin_lock(&pers_lock
);
627 md_wakeup_thread(mddev
->thread
);
628 spin_unlock(&pers_lock
);
631 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
633 struct md_rdev
*rdev
;
635 rdev_for_each_rcu(rdev
, mddev
)
636 if (rdev
->desc_nr
== nr
)
642 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
644 struct md_rdev
*rdev
;
646 rdev_for_each(rdev
, mddev
)
647 if (rdev
->bdev
->bd_dev
== dev
)
653 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
655 struct md_rdev
*rdev
;
657 rdev_for_each_rcu(rdev
, mddev
)
658 if (rdev
->bdev
->bd_dev
== dev
)
664 static struct md_personality
*find_pers(int level
, char *clevel
)
666 struct md_personality
*pers
;
667 list_for_each_entry(pers
, &pers_list
, list
) {
668 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
670 if (strcmp(pers
->name
, clevel
)==0)
676 /* return the offset of the super block in 512byte sectors */
677 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
679 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
680 return MD_NEW_SIZE_SECTORS(num_sectors
);
683 static int alloc_disk_sb(struct md_rdev
*rdev
)
688 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
689 if (!rdev
->sb_page
) {
690 printk(KERN_ALERT
"md: out of memory.\n");
697 void md_rdev_clear(struct md_rdev
*rdev
)
700 put_page(rdev
->sb_page
);
702 rdev
->sb_page
= NULL
;
707 put_page(rdev
->bb_page
);
708 rdev
->bb_page
= NULL
;
710 kfree(rdev
->badblocks
.page
);
711 rdev
->badblocks
.page
= NULL
;
713 EXPORT_SYMBOL_GPL(md_rdev_clear
);
715 static void super_written(struct bio
*bio
, int error
)
717 struct md_rdev
*rdev
= bio
->bi_private
;
718 struct mddev
*mddev
= rdev
->mddev
;
720 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
721 printk("md: super_written gets error=%d, uptodate=%d\n",
722 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
723 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
724 md_error(mddev
, rdev
);
727 if (atomic_dec_and_test(&mddev
->pending_writes
))
728 wake_up(&mddev
->sb_wait
);
732 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
733 sector_t sector
, int size
, struct page
*page
)
735 /* write first size bytes of page to sector of rdev
736 * Increment mddev->pending_writes before returning
737 * and decrement it on completion, waking up sb_wait
738 * if zero is reached.
739 * If an error occurred, call md_error
741 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
743 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
744 bio
->bi_iter
.bi_sector
= sector
;
745 bio_add_page(bio
, page
, size
, 0);
746 bio
->bi_private
= rdev
;
747 bio
->bi_end_io
= super_written
;
749 atomic_inc(&mddev
->pending_writes
);
750 submit_bio(WRITE_FLUSH_FUA
, bio
);
753 void md_super_wait(struct mddev
*mddev
)
755 /* wait for all superblock writes that were scheduled to complete */
756 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->pending_writes
)==0);
759 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
760 struct page
*page
, int rw
, bool metadata_op
)
762 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
765 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
766 rdev
->meta_bdev
: rdev
->bdev
;
768 bio
->bi_iter
.bi_sector
= sector
+ rdev
->sb_start
;
769 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
770 (rdev
->mddev
->reshape_backwards
==
771 (sector
>= rdev
->mddev
->reshape_position
)))
772 bio
->bi_iter
.bi_sector
= sector
+ rdev
->new_data_offset
;
774 bio
->bi_iter
.bi_sector
= sector
+ rdev
->data_offset
;
775 bio_add_page(bio
, page
, size
, 0);
776 submit_bio_wait(rw
, bio
);
778 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
782 EXPORT_SYMBOL_GPL(sync_page_io
);
784 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
786 char b
[BDEVNAME_SIZE
];
787 if (!rdev
->sb_page
) {
794 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
800 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
801 bdevname(rdev
->bdev
,b
));
805 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
807 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
808 sb1
->set_uuid1
== sb2
->set_uuid1
&&
809 sb1
->set_uuid2
== sb2
->set_uuid2
&&
810 sb1
->set_uuid3
== sb2
->set_uuid3
;
813 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
816 mdp_super_t
*tmp1
, *tmp2
;
818 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
819 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
821 if (!tmp1
|| !tmp2
) {
823 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
831 * nr_disks is not constant
836 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
843 static u32
md_csum_fold(u32 csum
)
845 csum
= (csum
& 0xffff) + (csum
>> 16);
846 return (csum
& 0xffff) + (csum
>> 16);
849 static unsigned int calc_sb_csum(mdp_super_t
*sb
)
852 u32
*sb32
= (u32
*)sb
;
854 unsigned int disk_csum
, csum
;
856 disk_csum
= sb
->sb_csum
;
859 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
861 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
864 /* This used to use csum_partial, which was wrong for several
865 * reasons including that different results are returned on
866 * different architectures. It isn't critical that we get exactly
867 * the same return value as before (we always csum_fold before
868 * testing, and that removes any differences). However as we
869 * know that csum_partial always returned a 16bit value on
870 * alphas, do a fold to maximise conformity to previous behaviour.
872 sb
->sb_csum
= md_csum_fold(disk_csum
);
874 sb
->sb_csum
= disk_csum
;
880 * Handle superblock details.
881 * We want to be able to handle multiple superblock formats
882 * so we have a common interface to them all, and an array of
883 * different handlers.
884 * We rely on user-space to write the initial superblock, and support
885 * reading and updating of superblocks.
886 * Interface methods are:
887 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
888 * loads and validates a superblock on dev.
889 * if refdev != NULL, compare superblocks on both devices
891 * 0 - dev has a superblock that is compatible with refdev
892 * 1 - dev has a superblock that is compatible and newer than refdev
893 * so dev should be used as the refdev in future
894 * -EINVAL superblock incompatible or invalid
895 * -othererror e.g. -EIO
897 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
898 * Verify that dev is acceptable into mddev.
899 * The first time, mddev->raid_disks will be 0, and data from
900 * dev should be merged in. Subsequent calls check that dev
901 * is new enough. Return 0 or -EINVAL
903 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
904 * Update the superblock for rdev with data in mddev
905 * This does not write to disc.
911 struct module
*owner
;
912 int (*load_super
)(struct md_rdev
*rdev
,
913 struct md_rdev
*refdev
,
915 int (*validate_super
)(struct mddev
*mddev
,
916 struct md_rdev
*rdev
);
917 void (*sync_super
)(struct mddev
*mddev
,
918 struct md_rdev
*rdev
);
919 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
920 sector_t num_sectors
);
921 int (*allow_new_offset
)(struct md_rdev
*rdev
,
922 unsigned long long new_offset
);
926 * Check that the given mddev has no bitmap.
928 * This function is called from the run method of all personalities that do not
929 * support bitmaps. It prints an error message and returns non-zero if mddev
930 * has a bitmap. Otherwise, it returns 0.
933 int md_check_no_bitmap(struct mddev
*mddev
)
935 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
937 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
938 mdname(mddev
), mddev
->pers
->name
);
941 EXPORT_SYMBOL(md_check_no_bitmap
);
944 * load_super for 0.90.0
946 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
948 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
953 * Calculate the position of the superblock (512byte sectors),
954 * it's at the end of the disk.
956 * It also happens to be a multiple of 4Kb.
958 rdev
->sb_start
= calc_dev_sboffset(rdev
);
960 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
965 bdevname(rdev
->bdev
, b
);
966 sb
= page_address(rdev
->sb_page
);
968 if (sb
->md_magic
!= MD_SB_MAGIC
) {
969 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
974 if (sb
->major_version
!= 0 ||
975 sb
->minor_version
< 90 ||
976 sb
->minor_version
> 91) {
977 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
978 sb
->major_version
, sb
->minor_version
,
983 if (sb
->raid_disks
<= 0)
986 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
987 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
992 rdev
->preferred_minor
= sb
->md_minor
;
993 rdev
->data_offset
= 0;
994 rdev
->new_data_offset
= 0;
995 rdev
->sb_size
= MD_SB_BYTES
;
996 rdev
->badblocks
.shift
= -1;
998 if (sb
->level
== LEVEL_MULTIPATH
)
1001 rdev
->desc_nr
= sb
->this_disk
.number
;
1007 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1008 if (!uuid_equal(refsb
, sb
)) {
1009 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1010 b
, bdevname(refdev
->bdev
,b2
));
1013 if (!sb_equal(refsb
, sb
)) {
1014 printk(KERN_WARNING
"md: %s has same UUID"
1015 " but different superblock to %s\n",
1016 b
, bdevname(refdev
->bdev
, b2
));
1020 ev2
= md_event(refsb
);
1026 rdev
->sectors
= rdev
->sb_start
;
1027 /* Limit to 4TB as metadata cannot record more than that.
1028 * (not needed for Linear and RAID0 as metadata doesn't
1031 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1032 rdev
->sectors
= (2ULL << 32) - 2;
1034 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1035 /* "this cannot possibly happen" ... */
1043 * validate_super for 0.90.0
1045 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1048 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1049 __u64 ev1
= md_event(sb
);
1051 rdev
->raid_disk
= -1;
1052 clear_bit(Faulty
, &rdev
->flags
);
1053 clear_bit(In_sync
, &rdev
->flags
);
1054 clear_bit(Bitmap_sync
, &rdev
->flags
);
1055 clear_bit(WriteMostly
, &rdev
->flags
);
1057 if (mddev
->raid_disks
== 0) {
1058 mddev
->major_version
= 0;
1059 mddev
->minor_version
= sb
->minor_version
;
1060 mddev
->patch_version
= sb
->patch_version
;
1061 mddev
->external
= 0;
1062 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1063 mddev
->ctime
= sb
->ctime
;
1064 mddev
->utime
= sb
->utime
;
1065 mddev
->level
= sb
->level
;
1066 mddev
->clevel
[0] = 0;
1067 mddev
->layout
= sb
->layout
;
1068 mddev
->raid_disks
= sb
->raid_disks
;
1069 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1070 mddev
->events
= ev1
;
1071 mddev
->bitmap_info
.offset
= 0;
1072 mddev
->bitmap_info
.space
= 0;
1073 /* bitmap can use 60 K after the 4K superblocks */
1074 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1075 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1076 mddev
->reshape_backwards
= 0;
1078 if (mddev
->minor_version
>= 91) {
1079 mddev
->reshape_position
= sb
->reshape_position
;
1080 mddev
->delta_disks
= sb
->delta_disks
;
1081 mddev
->new_level
= sb
->new_level
;
1082 mddev
->new_layout
= sb
->new_layout
;
1083 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1084 if (mddev
->delta_disks
< 0)
1085 mddev
->reshape_backwards
= 1;
1087 mddev
->reshape_position
= MaxSector
;
1088 mddev
->delta_disks
= 0;
1089 mddev
->new_level
= mddev
->level
;
1090 mddev
->new_layout
= mddev
->layout
;
1091 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1094 if (sb
->state
& (1<<MD_SB_CLEAN
))
1095 mddev
->recovery_cp
= MaxSector
;
1097 if (sb
->events_hi
== sb
->cp_events_hi
&&
1098 sb
->events_lo
== sb
->cp_events_lo
) {
1099 mddev
->recovery_cp
= sb
->recovery_cp
;
1101 mddev
->recovery_cp
= 0;
1104 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1105 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1106 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1107 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1109 mddev
->max_disks
= MD_SB_DISKS
;
1111 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1112 mddev
->bitmap_info
.file
== NULL
) {
1113 mddev
->bitmap_info
.offset
=
1114 mddev
->bitmap_info
.default_offset
;
1115 mddev
->bitmap_info
.space
=
1116 mddev
->bitmap_info
.default_space
;
1119 } else if (mddev
->pers
== NULL
) {
1120 /* Insist on good event counter while assembling, except
1121 * for spares (which don't need an event count) */
1123 if (sb
->disks
[rdev
->desc_nr
].state
& (
1124 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1125 if (ev1
< mddev
->events
)
1127 } else if (mddev
->bitmap
) {
1128 /* if adding to array with a bitmap, then we can accept an
1129 * older device ... but not too old.
1131 if (ev1
< mddev
->bitmap
->events_cleared
)
1133 if (ev1
< mddev
->events
)
1134 set_bit(Bitmap_sync
, &rdev
->flags
);
1136 if (ev1
< mddev
->events
)
1137 /* just a hot-add of a new device, leave raid_disk at -1 */
1141 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1142 desc
= sb
->disks
+ rdev
->desc_nr
;
1144 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1145 set_bit(Faulty
, &rdev
->flags
);
1146 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1147 desc->raid_disk < mddev->raid_disks */) {
1148 set_bit(In_sync
, &rdev
->flags
);
1149 rdev
->raid_disk
= desc
->raid_disk
;
1150 rdev
->saved_raid_disk
= desc
->raid_disk
;
1151 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1152 /* active but not in sync implies recovery up to
1153 * reshape position. We don't know exactly where
1154 * that is, so set to zero for now */
1155 if (mddev
->minor_version
>= 91) {
1156 rdev
->recovery_offset
= 0;
1157 rdev
->raid_disk
= desc
->raid_disk
;
1160 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1161 set_bit(WriteMostly
, &rdev
->flags
);
1162 } else /* MULTIPATH are always insync */
1163 set_bit(In_sync
, &rdev
->flags
);
1168 * sync_super for 0.90.0
1170 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1173 struct md_rdev
*rdev2
;
1174 int next_spare
= mddev
->raid_disks
;
1176 /* make rdev->sb match mddev data..
1179 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1180 * 3/ any empty disks < next_spare become removed
1182 * disks[0] gets initialised to REMOVED because
1183 * we cannot be sure from other fields if it has
1184 * been initialised or not.
1187 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1189 rdev
->sb_size
= MD_SB_BYTES
;
1191 sb
= page_address(rdev
->sb_page
);
1193 memset(sb
, 0, sizeof(*sb
));
1195 sb
->md_magic
= MD_SB_MAGIC
;
1196 sb
->major_version
= mddev
->major_version
;
1197 sb
->patch_version
= mddev
->patch_version
;
1198 sb
->gvalid_words
= 0; /* ignored */
1199 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1200 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1201 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1202 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1204 sb
->ctime
= mddev
->ctime
;
1205 sb
->level
= mddev
->level
;
1206 sb
->size
= mddev
->dev_sectors
/ 2;
1207 sb
->raid_disks
= mddev
->raid_disks
;
1208 sb
->md_minor
= mddev
->md_minor
;
1209 sb
->not_persistent
= 0;
1210 sb
->utime
= mddev
->utime
;
1212 sb
->events_hi
= (mddev
->events
>>32);
1213 sb
->events_lo
= (u32
)mddev
->events
;
1215 if (mddev
->reshape_position
== MaxSector
)
1216 sb
->minor_version
= 90;
1218 sb
->minor_version
= 91;
1219 sb
->reshape_position
= mddev
->reshape_position
;
1220 sb
->new_level
= mddev
->new_level
;
1221 sb
->delta_disks
= mddev
->delta_disks
;
1222 sb
->new_layout
= mddev
->new_layout
;
1223 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1225 mddev
->minor_version
= sb
->minor_version
;
1228 sb
->recovery_cp
= mddev
->recovery_cp
;
1229 sb
->cp_events_hi
= (mddev
->events
>>32);
1230 sb
->cp_events_lo
= (u32
)mddev
->events
;
1231 if (mddev
->recovery_cp
== MaxSector
)
1232 sb
->state
= (1<< MD_SB_CLEAN
);
1234 sb
->recovery_cp
= 0;
1236 sb
->layout
= mddev
->layout
;
1237 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1239 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1240 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1242 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1243 rdev_for_each(rdev2
, mddev
) {
1246 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1248 if (rdev2
->raid_disk
>= 0 &&
1249 sb
->minor_version
>= 91)
1250 /* we have nowhere to store the recovery_offset,
1251 * but if it is not below the reshape_position,
1252 * we can piggy-back on that.
1255 if (rdev2
->raid_disk
< 0 ||
1256 test_bit(Faulty
, &rdev2
->flags
))
1259 desc_nr
= rdev2
->raid_disk
;
1261 desc_nr
= next_spare
++;
1262 rdev2
->desc_nr
= desc_nr
;
1263 d
= &sb
->disks
[rdev2
->desc_nr
];
1265 d
->number
= rdev2
->desc_nr
;
1266 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1267 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1269 d
->raid_disk
= rdev2
->raid_disk
;
1271 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1272 if (test_bit(Faulty
, &rdev2
->flags
))
1273 d
->state
= (1<<MD_DISK_FAULTY
);
1274 else if (is_active
) {
1275 d
->state
= (1<<MD_DISK_ACTIVE
);
1276 if (test_bit(In_sync
, &rdev2
->flags
))
1277 d
->state
|= (1<<MD_DISK_SYNC
);
1285 if (test_bit(WriteMostly
, &rdev2
->flags
))
1286 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1288 /* now set the "removed" and "faulty" bits on any missing devices */
1289 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1290 mdp_disk_t
*d
= &sb
->disks
[i
];
1291 if (d
->state
== 0 && d
->number
== 0) {
1294 d
->state
= (1<<MD_DISK_REMOVED
);
1295 d
->state
|= (1<<MD_DISK_FAULTY
);
1299 sb
->nr_disks
= nr_disks
;
1300 sb
->active_disks
= active
;
1301 sb
->working_disks
= working
;
1302 sb
->failed_disks
= failed
;
1303 sb
->spare_disks
= spare
;
1305 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1306 sb
->sb_csum
= calc_sb_csum(sb
);
1310 * rdev_size_change for 0.90.0
1312 static unsigned long long
1313 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1315 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1316 return 0; /* component must fit device */
1317 if (rdev
->mddev
->bitmap_info
.offset
)
1318 return 0; /* can't move bitmap */
1319 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1320 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1321 num_sectors
= rdev
->sb_start
;
1322 /* Limit to 4TB as metadata cannot record more than that.
1323 * 4TB == 2^32 KB, or 2*2^32 sectors.
1325 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1326 num_sectors
= (2ULL << 32) - 2;
1327 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1329 md_super_wait(rdev
->mddev
);
1334 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1336 /* non-zero offset changes not possible with v0.90 */
1337 return new_offset
== 0;
1341 * version 1 superblock
1344 static __le32
calc_sb_1_csum(struct mdp_superblock_1
*sb
)
1348 unsigned long long newcsum
;
1349 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1350 __le32
*isuper
= (__le32
*)sb
;
1352 disk_csum
= sb
->sb_csum
;
1355 for (; size
>= 4; size
-= 4)
1356 newcsum
+= le32_to_cpu(*isuper
++);
1359 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1361 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1362 sb
->sb_csum
= disk_csum
;
1363 return cpu_to_le32(csum
);
1366 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1368 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1370 struct mdp_superblock_1
*sb
;
1374 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1378 * Calculate the position of the superblock in 512byte sectors.
1379 * It is always aligned to a 4K boundary and
1380 * depeding on minor_version, it can be:
1381 * 0: At least 8K, but less than 12K, from end of device
1382 * 1: At start of device
1383 * 2: 4K from start of device.
1385 switch(minor_version
) {
1387 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1389 sb_start
&= ~(sector_t
)(4*2-1);
1400 rdev
->sb_start
= sb_start
;
1402 /* superblock is rarely larger than 1K, but it can be larger,
1403 * and it is safe to read 4k, so we do that
1405 ret
= read_disk_sb(rdev
, 4096);
1406 if (ret
) return ret
;
1408 sb
= page_address(rdev
->sb_page
);
1410 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1411 sb
->major_version
!= cpu_to_le32(1) ||
1412 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1413 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1414 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1417 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1418 printk("md: invalid superblock checksum on %s\n",
1419 bdevname(rdev
->bdev
,b
));
1422 if (le64_to_cpu(sb
->data_size
) < 10) {
1423 printk("md: data_size too small on %s\n",
1424 bdevname(rdev
->bdev
,b
));
1429 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1430 /* Some padding is non-zero, might be a new feature */
1433 rdev
->preferred_minor
= 0xffff;
1434 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1435 rdev
->new_data_offset
= rdev
->data_offset
;
1436 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1437 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1438 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1439 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1441 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1442 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1443 if (rdev
->sb_size
& bmask
)
1444 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1447 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1450 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1453 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1456 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1458 if (!rdev
->bb_page
) {
1459 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1463 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1464 rdev
->badblocks
.count
== 0) {
1465 /* need to load the bad block list.
1466 * Currently we limit it to one page.
1472 int sectors
= le16_to_cpu(sb
->bblog_size
);
1473 if (sectors
> (PAGE_SIZE
/ 512))
1475 offset
= le32_to_cpu(sb
->bblog_offset
);
1478 bb_sector
= (long long)offset
;
1479 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1480 rdev
->bb_page
, READ
, true))
1482 bbp
= (u64
*)page_address(rdev
->bb_page
);
1483 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1484 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1485 u64 bb
= le64_to_cpu(*bbp
);
1486 int count
= bb
& (0x3ff);
1487 u64 sector
= bb
>> 10;
1488 sector
<<= sb
->bblog_shift
;
1489 count
<<= sb
->bblog_shift
;
1492 if (md_set_badblocks(&rdev
->badblocks
,
1493 sector
, count
, 1) == 0)
1496 } else if (sb
->bblog_offset
!= 0)
1497 rdev
->badblocks
.shift
= 0;
1503 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1505 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1506 sb
->level
!= refsb
->level
||
1507 sb
->layout
!= refsb
->layout
||
1508 sb
->chunksize
!= refsb
->chunksize
) {
1509 printk(KERN_WARNING
"md: %s has strangely different"
1510 " superblock to %s\n",
1511 bdevname(rdev
->bdev
,b
),
1512 bdevname(refdev
->bdev
,b2
));
1515 ev1
= le64_to_cpu(sb
->events
);
1516 ev2
= le64_to_cpu(refsb
->events
);
1523 if (minor_version
) {
1524 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1525 sectors
-= rdev
->data_offset
;
1527 sectors
= rdev
->sb_start
;
1528 if (sectors
< le64_to_cpu(sb
->data_size
))
1530 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1534 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1536 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1537 __u64 ev1
= le64_to_cpu(sb
->events
);
1539 rdev
->raid_disk
= -1;
1540 clear_bit(Faulty
, &rdev
->flags
);
1541 clear_bit(In_sync
, &rdev
->flags
);
1542 clear_bit(Bitmap_sync
, &rdev
->flags
);
1543 clear_bit(WriteMostly
, &rdev
->flags
);
1545 if (mddev
->raid_disks
== 0) {
1546 mddev
->major_version
= 1;
1547 mddev
->patch_version
= 0;
1548 mddev
->external
= 0;
1549 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1550 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1551 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1552 mddev
->level
= le32_to_cpu(sb
->level
);
1553 mddev
->clevel
[0] = 0;
1554 mddev
->layout
= le32_to_cpu(sb
->layout
);
1555 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1556 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1557 mddev
->events
= ev1
;
1558 mddev
->bitmap_info
.offset
= 0;
1559 mddev
->bitmap_info
.space
= 0;
1560 /* Default location for bitmap is 1K after superblock
1561 * using 3K - total of 4K
1563 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1564 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1565 mddev
->reshape_backwards
= 0;
1567 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1568 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1570 mddev
->max_disks
= (4096-256)/2;
1572 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1573 mddev
->bitmap_info
.file
== NULL
) {
1574 mddev
->bitmap_info
.offset
=
1575 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1576 /* Metadata doesn't record how much space is available.
1577 * For 1.0, we assume we can use up to the superblock
1578 * if before, else to 4K beyond superblock.
1579 * For others, assume no change is possible.
1581 if (mddev
->minor_version
> 0)
1582 mddev
->bitmap_info
.space
= 0;
1583 else if (mddev
->bitmap_info
.offset
> 0)
1584 mddev
->bitmap_info
.space
=
1585 8 - mddev
->bitmap_info
.offset
;
1587 mddev
->bitmap_info
.space
=
1588 -mddev
->bitmap_info
.offset
;
1591 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1592 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1593 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1594 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1595 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1596 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1597 if (mddev
->delta_disks
< 0 ||
1598 (mddev
->delta_disks
== 0 &&
1599 (le32_to_cpu(sb
->feature_map
)
1600 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1601 mddev
->reshape_backwards
= 1;
1603 mddev
->reshape_position
= MaxSector
;
1604 mddev
->delta_disks
= 0;
1605 mddev
->new_level
= mddev
->level
;
1606 mddev
->new_layout
= mddev
->layout
;
1607 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1610 } else if (mddev
->pers
== NULL
) {
1611 /* Insist of good event counter while assembling, except for
1612 * spares (which don't need an event count) */
1614 if (rdev
->desc_nr
>= 0 &&
1615 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1616 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1617 if (ev1
< mddev
->events
)
1619 } else if (mddev
->bitmap
) {
1620 /* If adding to array with a bitmap, then we can accept an
1621 * older device, but not too old.
1623 if (ev1
< mddev
->bitmap
->events_cleared
)
1625 if (ev1
< mddev
->events
)
1626 set_bit(Bitmap_sync
, &rdev
->flags
);
1628 if (ev1
< mddev
->events
)
1629 /* just a hot-add of a new device, leave raid_disk at -1 */
1632 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1634 if (rdev
->desc_nr
< 0 ||
1635 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1639 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1641 case 0xffff: /* spare */
1643 case 0xfffe: /* faulty */
1644 set_bit(Faulty
, &rdev
->flags
);
1647 rdev
->saved_raid_disk
= role
;
1648 if ((le32_to_cpu(sb
->feature_map
) &
1649 MD_FEATURE_RECOVERY_OFFSET
)) {
1650 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1651 if (!(le32_to_cpu(sb
->feature_map
) &
1652 MD_FEATURE_RECOVERY_BITMAP
))
1653 rdev
->saved_raid_disk
= -1;
1655 set_bit(In_sync
, &rdev
->flags
);
1656 rdev
->raid_disk
= role
;
1659 if (sb
->devflags
& WriteMostly1
)
1660 set_bit(WriteMostly
, &rdev
->flags
);
1661 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1662 set_bit(Replacement
, &rdev
->flags
);
1663 } else /* MULTIPATH are always insync */
1664 set_bit(In_sync
, &rdev
->flags
);
1669 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1671 struct mdp_superblock_1
*sb
;
1672 struct md_rdev
*rdev2
;
1674 /* make rdev->sb match mddev and rdev data. */
1676 sb
= page_address(rdev
->sb_page
);
1678 sb
->feature_map
= 0;
1680 sb
->recovery_offset
= cpu_to_le64(0);
1681 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1683 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1684 sb
->events
= cpu_to_le64(mddev
->events
);
1686 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1688 sb
->resync_offset
= cpu_to_le64(0);
1690 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1692 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1693 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1694 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1695 sb
->level
= cpu_to_le32(mddev
->level
);
1696 sb
->layout
= cpu_to_le32(mddev
->layout
);
1698 if (test_bit(WriteMostly
, &rdev
->flags
))
1699 sb
->devflags
|= WriteMostly1
;
1701 sb
->devflags
&= ~WriteMostly1
;
1702 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1703 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1705 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1706 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1707 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1710 if (rdev
->raid_disk
>= 0 &&
1711 !test_bit(In_sync
, &rdev
->flags
)) {
1713 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1714 sb
->recovery_offset
=
1715 cpu_to_le64(rdev
->recovery_offset
);
1716 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1718 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1720 if (test_bit(Replacement
, &rdev
->flags
))
1722 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1724 if (mddev
->reshape_position
!= MaxSector
) {
1725 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1726 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1727 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1728 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1729 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1730 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1731 if (mddev
->delta_disks
== 0 &&
1732 mddev
->reshape_backwards
)
1734 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1735 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1737 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1738 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1739 - rdev
->data_offset
));
1743 if (rdev
->badblocks
.count
== 0)
1744 /* Nothing to do for bad blocks*/ ;
1745 else if (sb
->bblog_offset
== 0)
1746 /* Cannot record bad blocks on this device */
1747 md_error(mddev
, rdev
);
1749 struct badblocks
*bb
= &rdev
->badblocks
;
1750 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1752 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1757 seq
= read_seqbegin(&bb
->lock
);
1759 memset(bbp
, 0xff, PAGE_SIZE
);
1761 for (i
= 0 ; i
< bb
->count
; i
++) {
1762 u64 internal_bb
= p
[i
];
1763 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1764 | BB_LEN(internal_bb
));
1765 bbp
[i
] = cpu_to_le64(store_bb
);
1768 if (read_seqretry(&bb
->lock
, seq
))
1771 bb
->sector
= (rdev
->sb_start
+
1772 (int)le32_to_cpu(sb
->bblog_offset
));
1773 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1778 rdev_for_each(rdev2
, mddev
)
1779 if (rdev2
->desc_nr
+1 > max_dev
)
1780 max_dev
= rdev2
->desc_nr
+1;
1782 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1784 sb
->max_dev
= cpu_to_le32(max_dev
);
1785 rdev
->sb_size
= max_dev
* 2 + 256;
1786 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1787 if (rdev
->sb_size
& bmask
)
1788 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1790 max_dev
= le32_to_cpu(sb
->max_dev
);
1792 for (i
=0; i
<max_dev
;i
++)
1793 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1795 rdev_for_each(rdev2
, mddev
) {
1797 if (test_bit(Faulty
, &rdev2
->flags
))
1798 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1799 else if (test_bit(In_sync
, &rdev2
->flags
))
1800 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1801 else if (rdev2
->raid_disk
>= 0)
1802 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1804 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1807 sb
->sb_csum
= calc_sb_1_csum(sb
);
1810 static unsigned long long
1811 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1813 struct mdp_superblock_1
*sb
;
1814 sector_t max_sectors
;
1815 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1816 return 0; /* component must fit device */
1817 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1818 return 0; /* too confusing */
1819 if (rdev
->sb_start
< rdev
->data_offset
) {
1820 /* minor versions 1 and 2; superblock before data */
1821 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1822 max_sectors
-= rdev
->data_offset
;
1823 if (!num_sectors
|| num_sectors
> max_sectors
)
1824 num_sectors
= max_sectors
;
1825 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1826 /* minor version 0 with bitmap we can't move */
1829 /* minor version 0; superblock after data */
1831 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1832 sb_start
&= ~(sector_t
)(4*2 - 1);
1833 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1834 if (!num_sectors
|| num_sectors
> max_sectors
)
1835 num_sectors
= max_sectors
;
1836 rdev
->sb_start
= sb_start
;
1838 sb
= page_address(rdev
->sb_page
);
1839 sb
->data_size
= cpu_to_le64(num_sectors
);
1840 sb
->super_offset
= rdev
->sb_start
;
1841 sb
->sb_csum
= calc_sb_1_csum(sb
);
1842 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1844 md_super_wait(rdev
->mddev
);
1850 super_1_allow_new_offset(struct md_rdev
*rdev
,
1851 unsigned long long new_offset
)
1853 /* All necessary checks on new >= old have been done */
1854 struct bitmap
*bitmap
;
1855 if (new_offset
>= rdev
->data_offset
)
1858 /* with 1.0 metadata, there is no metadata to tread on
1859 * so we can always move back */
1860 if (rdev
->mddev
->minor_version
== 0)
1863 /* otherwise we must be sure not to step on
1864 * any metadata, so stay:
1865 * 36K beyond start of superblock
1866 * beyond end of badblocks
1867 * beyond write-intent bitmap
1869 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1871 bitmap
= rdev
->mddev
->bitmap
;
1872 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1873 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1874 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1876 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1882 static struct super_type super_types
[] = {
1885 .owner
= THIS_MODULE
,
1886 .load_super
= super_90_load
,
1887 .validate_super
= super_90_validate
,
1888 .sync_super
= super_90_sync
,
1889 .rdev_size_change
= super_90_rdev_size_change
,
1890 .allow_new_offset
= super_90_allow_new_offset
,
1894 .owner
= THIS_MODULE
,
1895 .load_super
= super_1_load
,
1896 .validate_super
= super_1_validate
,
1897 .sync_super
= super_1_sync
,
1898 .rdev_size_change
= super_1_rdev_size_change
,
1899 .allow_new_offset
= super_1_allow_new_offset
,
1903 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1905 if (mddev
->sync_super
) {
1906 mddev
->sync_super(mddev
, rdev
);
1910 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1912 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1915 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1917 struct md_rdev
*rdev
, *rdev2
;
1920 rdev_for_each_rcu(rdev
, mddev1
)
1921 rdev_for_each_rcu(rdev2
, mddev2
)
1922 if (rdev
->bdev
->bd_contains
==
1923 rdev2
->bdev
->bd_contains
) {
1931 static LIST_HEAD(pending_raid_disks
);
1934 * Try to register data integrity profile for an mddev
1936 * This is called when an array is started and after a disk has been kicked
1937 * from the array. It only succeeds if all working and active component devices
1938 * are integrity capable with matching profiles.
1940 int md_integrity_register(struct mddev
*mddev
)
1942 struct md_rdev
*rdev
, *reference
= NULL
;
1944 if (list_empty(&mddev
->disks
))
1945 return 0; /* nothing to do */
1946 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1947 return 0; /* shouldn't register, or already is */
1948 rdev_for_each(rdev
, mddev
) {
1949 /* skip spares and non-functional disks */
1950 if (test_bit(Faulty
, &rdev
->flags
))
1952 if (rdev
->raid_disk
< 0)
1955 /* Use the first rdev as the reference */
1959 /* does this rdev's profile match the reference profile? */
1960 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1961 rdev
->bdev
->bd_disk
) < 0)
1964 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1967 * All component devices are integrity capable and have matching
1968 * profiles, register the common profile for the md device.
1970 if (blk_integrity_register(mddev
->gendisk
,
1971 bdev_get_integrity(reference
->bdev
)) != 0) {
1972 printk(KERN_ERR
"md: failed to register integrity for %s\n",
1976 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
1977 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
1978 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
1984 EXPORT_SYMBOL(md_integrity_register
);
1986 /* Disable data integrity if non-capable/non-matching disk is being added */
1987 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
1989 struct blk_integrity
*bi_rdev
;
1990 struct blk_integrity
*bi_mddev
;
1992 if (!mddev
->gendisk
)
1995 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
1996 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
1998 if (!bi_mddev
) /* nothing to do */
2000 if (rdev
->raid_disk
< 0) /* skip spares */
2002 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2003 rdev
->bdev
->bd_disk
) >= 0)
2005 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2006 blk_integrity_unregister(mddev
->gendisk
);
2008 EXPORT_SYMBOL(md_integrity_add_rdev
);
2010 static int bind_rdev_to_array(struct md_rdev
*rdev
, struct mddev
*mddev
)
2012 char b
[BDEVNAME_SIZE
];
2022 /* prevent duplicates */
2023 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2026 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2027 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2028 rdev
->sectors
< mddev
->dev_sectors
)) {
2030 /* Cannot change size, so fail
2031 * If mddev->level <= 0, then we don't care
2032 * about aligning sizes (e.g. linear)
2034 if (mddev
->level
> 0)
2037 mddev
->dev_sectors
= rdev
->sectors
;
2040 /* Verify rdev->desc_nr is unique.
2041 * If it is -1, assign a free number, else
2042 * check number is not in use
2045 if (rdev
->desc_nr
< 0) {
2048 choice
= mddev
->raid_disks
;
2049 while (find_rdev_nr_rcu(mddev
, choice
))
2051 rdev
->desc_nr
= choice
;
2053 if (find_rdev_nr_rcu(mddev
, rdev
->desc_nr
)) {
2059 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2060 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2061 mdname(mddev
), mddev
->max_disks
);
2064 bdevname(rdev
->bdev
,b
);
2065 while ( (s
=strchr(b
, '/')) != NULL
)
2068 rdev
->mddev
= mddev
;
2069 printk(KERN_INFO
"md: bind<%s>\n", b
);
2071 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2074 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2075 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2076 /* failure here is OK */;
2077 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2079 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2080 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2082 /* May as well allow recovery to be retried once */
2083 mddev
->recovery_disabled
++;
2088 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2093 static void md_delayed_delete(struct work_struct
*ws
)
2095 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2096 kobject_del(&rdev
->kobj
);
2097 kobject_put(&rdev
->kobj
);
2100 static void unbind_rdev_from_array(struct md_rdev
*rdev
)
2102 char b
[BDEVNAME_SIZE
];
2107 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2108 list_del_rcu(&rdev
->same_set
);
2109 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2111 sysfs_remove_link(&rdev
->kobj
, "block");
2112 sysfs_put(rdev
->sysfs_state
);
2113 rdev
->sysfs_state
= NULL
;
2114 rdev
->badblocks
.count
= 0;
2115 /* We need to delay this, otherwise we can deadlock when
2116 * writing to 'remove' to "dev/state". We also need
2117 * to delay it due to rcu usage.
2120 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2121 kobject_get(&rdev
->kobj
);
2122 queue_work(md_misc_wq
, &rdev
->del_work
);
2126 * prevent the device from being mounted, repartitioned or
2127 * otherwise reused by a RAID array (or any other kernel
2128 * subsystem), by bd_claiming the device.
2130 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2133 struct block_device
*bdev
;
2134 char b
[BDEVNAME_SIZE
];
2136 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2137 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2139 printk(KERN_ERR
"md: could not open %s.\n",
2140 __bdevname(dev
, b
));
2141 return PTR_ERR(bdev
);
2147 static void unlock_rdev(struct md_rdev
*rdev
)
2149 struct block_device
*bdev
= rdev
->bdev
;
2153 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2156 void md_autodetect_dev(dev_t dev
);
2158 static void export_rdev(struct md_rdev
*rdev
)
2160 char b
[BDEVNAME_SIZE
];
2161 printk(KERN_INFO
"md: export_rdev(%s)\n",
2162 bdevname(rdev
->bdev
,b
));
2165 md_rdev_clear(rdev
);
2167 if (test_bit(AutoDetected
, &rdev
->flags
))
2168 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2171 kobject_put(&rdev
->kobj
);
2174 static void kick_rdev_from_array(struct md_rdev
*rdev
)
2176 unbind_rdev_from_array(rdev
);
2180 static void export_array(struct mddev
*mddev
)
2182 struct md_rdev
*rdev
;
2184 while (!list_empty(&mddev
->disks
)) {
2185 rdev
= list_first_entry(&mddev
->disks
, struct md_rdev
,
2187 kick_rdev_from_array(rdev
);
2189 mddev
->raid_disks
= 0;
2190 mddev
->major_version
= 0;
2193 static void print_desc(mdp_disk_t
*desc
)
2195 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2196 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2199 static void print_sb_90(mdp_super_t
*sb
)
2204 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2205 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2206 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2208 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2209 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2210 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2211 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2212 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2213 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2214 sb
->failed_disks
, sb
->spare_disks
,
2215 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2218 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2221 desc
= sb
->disks
+ i
;
2222 if (desc
->number
|| desc
->major
|| desc
->minor
||
2223 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2224 printk(" D %2d: ", i
);
2228 printk(KERN_INFO
"md: THIS: ");
2229 print_desc(&sb
->this_disk
);
2232 static void print_sb_1(struct mdp_superblock_1
*sb
)
2236 uuid
= sb
->set_uuid
;
2238 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2239 "md: Name: \"%s\" CT:%llu\n",
2240 le32_to_cpu(sb
->major_version
),
2241 le32_to_cpu(sb
->feature_map
),
2244 (unsigned long long)le64_to_cpu(sb
->ctime
)
2245 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2247 uuid
= sb
->device_uuid
;
2249 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2251 "md: Dev:%08x UUID: %pU\n"
2252 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2253 "md: (MaxDev:%u) \n",
2254 le32_to_cpu(sb
->level
),
2255 (unsigned long long)le64_to_cpu(sb
->size
),
2256 le32_to_cpu(sb
->raid_disks
),
2257 le32_to_cpu(sb
->layout
),
2258 le32_to_cpu(sb
->chunksize
),
2259 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2260 (unsigned long long)le64_to_cpu(sb
->data_size
),
2261 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2262 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2263 le32_to_cpu(sb
->dev_number
),
2266 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2267 (unsigned long long)le64_to_cpu(sb
->events
),
2268 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2269 le32_to_cpu(sb
->sb_csum
),
2270 le32_to_cpu(sb
->max_dev
)
2274 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2276 char b
[BDEVNAME_SIZE
];
2277 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2278 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2279 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2281 if (rdev
->sb_loaded
) {
2282 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2283 switch (major_version
) {
2285 print_sb_90(page_address(rdev
->sb_page
));
2288 print_sb_1(page_address(rdev
->sb_page
));
2292 printk(KERN_INFO
"md: no rdev superblock!\n");
2295 static void md_print_devices(void)
2297 struct list_head
*tmp
;
2298 struct md_rdev
*rdev
;
2299 struct mddev
*mddev
;
2300 char b
[BDEVNAME_SIZE
];
2303 printk("md: **********************************\n");
2304 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2305 printk("md: **********************************\n");
2306 for_each_mddev(mddev
, tmp
) {
2309 bitmap_print_sb(mddev
->bitmap
);
2311 printk("%s: ", mdname(mddev
));
2312 rdev_for_each(rdev
, mddev
)
2313 printk("<%s>", bdevname(rdev
->bdev
,b
));
2316 rdev_for_each(rdev
, mddev
)
2317 print_rdev(rdev
, mddev
->major_version
);
2319 printk("md: **********************************\n");
2323 static void sync_sbs(struct mddev
*mddev
, int nospares
)
2325 /* Update each superblock (in-memory image), but
2326 * if we are allowed to, skip spares which already
2327 * have the right event counter, or have one earlier
2328 * (which would mean they aren't being marked as dirty
2329 * with the rest of the array)
2331 struct md_rdev
*rdev
;
2332 rdev_for_each(rdev
, mddev
) {
2333 if (rdev
->sb_events
== mddev
->events
||
2335 rdev
->raid_disk
< 0 &&
2336 rdev
->sb_events
+1 == mddev
->events
)) {
2337 /* Don't update this superblock */
2338 rdev
->sb_loaded
= 2;
2340 sync_super(mddev
, rdev
);
2341 rdev
->sb_loaded
= 1;
2346 static void md_update_sb(struct mddev
*mddev
, int force_change
)
2348 struct md_rdev
*rdev
;
2351 int any_badblocks_changed
= 0;
2355 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2359 /* First make sure individual recovery_offsets are correct */
2360 rdev_for_each(rdev
, mddev
) {
2361 if (rdev
->raid_disk
>= 0 &&
2362 mddev
->delta_disks
>= 0 &&
2363 !test_bit(In_sync
, &rdev
->flags
) &&
2364 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2365 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2368 if (!mddev
->persistent
) {
2369 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2370 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2371 if (!mddev
->external
) {
2372 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2373 rdev_for_each(rdev
, mddev
) {
2374 if (rdev
->badblocks
.changed
) {
2375 rdev
->badblocks
.changed
= 0;
2376 md_ack_all_badblocks(&rdev
->badblocks
);
2377 md_error(mddev
, rdev
);
2379 clear_bit(Blocked
, &rdev
->flags
);
2380 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2381 wake_up(&rdev
->blocked_wait
);
2384 wake_up(&mddev
->sb_wait
);
2388 spin_lock_irq(&mddev
->write_lock
);
2390 mddev
->utime
= get_seconds();
2392 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2394 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2395 /* just a clean<-> dirty transition, possibly leave spares alone,
2396 * though if events isn't the right even/odd, we will have to do
2402 if (mddev
->degraded
)
2403 /* If the array is degraded, then skipping spares is both
2404 * dangerous and fairly pointless.
2405 * Dangerous because a device that was removed from the array
2406 * might have a event_count that still looks up-to-date,
2407 * so it can be re-added without a resync.
2408 * Pointless because if there are any spares to skip,
2409 * then a recovery will happen and soon that array won't
2410 * be degraded any more and the spare can go back to sleep then.
2414 sync_req
= mddev
->in_sync
;
2416 /* If this is just a dirty<->clean transition, and the array is clean
2417 * and 'events' is odd, we can roll back to the previous clean state */
2419 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2420 && mddev
->can_decrease_events
2421 && mddev
->events
!= 1) {
2423 mddev
->can_decrease_events
= 0;
2425 /* otherwise we have to go forward and ... */
2427 mddev
->can_decrease_events
= nospares
;
2430 if (!mddev
->events
) {
2432 * oops, this 64-bit counter should never wrap.
2433 * Either we are in around ~1 trillion A.C., assuming
2434 * 1 reboot per second, or we have a bug:
2440 rdev_for_each(rdev
, mddev
) {
2441 if (rdev
->badblocks
.changed
)
2442 any_badblocks_changed
++;
2443 if (test_bit(Faulty
, &rdev
->flags
))
2444 set_bit(FaultRecorded
, &rdev
->flags
);
2447 sync_sbs(mddev
, nospares
);
2448 spin_unlock_irq(&mddev
->write_lock
);
2450 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2451 mdname(mddev
), mddev
->in_sync
);
2453 bitmap_update_sb(mddev
->bitmap
);
2454 rdev_for_each(rdev
, mddev
) {
2455 char b
[BDEVNAME_SIZE
];
2457 if (rdev
->sb_loaded
!= 1)
2458 continue; /* no noise on spare devices */
2460 if (!test_bit(Faulty
, &rdev
->flags
)) {
2461 md_super_write(mddev
,rdev
,
2462 rdev
->sb_start
, rdev
->sb_size
,
2464 pr_debug("md: (write) %s's sb offset: %llu\n",
2465 bdevname(rdev
->bdev
, b
),
2466 (unsigned long long)rdev
->sb_start
);
2467 rdev
->sb_events
= mddev
->events
;
2468 if (rdev
->badblocks
.size
) {
2469 md_super_write(mddev
, rdev
,
2470 rdev
->badblocks
.sector
,
2471 rdev
->badblocks
.size
<< 9,
2473 rdev
->badblocks
.size
= 0;
2477 pr_debug("md: %s (skipping faulty)\n",
2478 bdevname(rdev
->bdev
, b
));
2480 if (mddev
->level
== LEVEL_MULTIPATH
)
2481 /* only need to write one superblock... */
2484 md_super_wait(mddev
);
2485 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2487 spin_lock_irq(&mddev
->write_lock
);
2488 if (mddev
->in_sync
!= sync_req
||
2489 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2490 /* have to write it out again */
2491 spin_unlock_irq(&mddev
->write_lock
);
2494 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2495 spin_unlock_irq(&mddev
->write_lock
);
2496 wake_up(&mddev
->sb_wait
);
2497 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2498 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2500 rdev_for_each(rdev
, mddev
) {
2501 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2502 clear_bit(Blocked
, &rdev
->flags
);
2504 if (any_badblocks_changed
)
2505 md_ack_all_badblocks(&rdev
->badblocks
);
2506 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2507 wake_up(&rdev
->blocked_wait
);
2511 /* words written to sysfs files may, or may not, be \n terminated.
2512 * We want to accept with case. For this we use cmd_match.
2514 static int cmd_match(const char *cmd
, const char *str
)
2516 /* See if cmd, written into a sysfs file, matches
2517 * str. They must either be the same, or cmd can
2518 * have a trailing newline
2520 while (*cmd
&& *str
&& *cmd
== *str
) {
2531 struct rdev_sysfs_entry
{
2532 struct attribute attr
;
2533 ssize_t (*show
)(struct md_rdev
*, char *);
2534 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2538 state_show(struct md_rdev
*rdev
, char *page
)
2543 if (test_bit(Faulty
, &rdev
->flags
) ||
2544 rdev
->badblocks
.unacked_exist
) {
2545 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2548 if (test_bit(In_sync
, &rdev
->flags
)) {
2549 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2552 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2553 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2556 if (test_bit(Blocked
, &rdev
->flags
) ||
2557 (rdev
->badblocks
.unacked_exist
2558 && !test_bit(Faulty
, &rdev
->flags
))) {
2559 len
+= sprintf(page
+len
, "%sblocked", sep
);
2562 if (!test_bit(Faulty
, &rdev
->flags
) &&
2563 !test_bit(In_sync
, &rdev
->flags
)) {
2564 len
+= sprintf(page
+len
, "%sspare", sep
);
2567 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2568 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2571 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2572 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2575 if (test_bit(Replacement
, &rdev
->flags
)) {
2576 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2580 return len
+sprintf(page
+len
, "\n");
2584 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2587 * faulty - simulates an error
2588 * remove - disconnects the device
2589 * writemostly - sets write_mostly
2590 * -writemostly - clears write_mostly
2591 * blocked - sets the Blocked flags
2592 * -blocked - clears the Blocked and possibly simulates an error
2593 * insync - sets Insync providing device isn't active
2594 * -insync - clear Insync for a device with a slot assigned,
2595 * so that it gets rebuilt based on bitmap
2596 * write_error - sets WriteErrorSeen
2597 * -write_error - clears WriteErrorSeen
2600 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2601 md_error(rdev
->mddev
, rdev
);
2602 if (test_bit(Faulty
, &rdev
->flags
))
2606 } else if (cmd_match(buf
, "remove")) {
2607 if (rdev
->raid_disk
>= 0)
2610 struct mddev
*mddev
= rdev
->mddev
;
2611 kick_rdev_from_array(rdev
);
2613 md_update_sb(mddev
, 1);
2614 md_new_event(mddev
);
2617 } else if (cmd_match(buf
, "writemostly")) {
2618 set_bit(WriteMostly
, &rdev
->flags
);
2620 } else if (cmd_match(buf
, "-writemostly")) {
2621 clear_bit(WriteMostly
, &rdev
->flags
);
2623 } else if (cmd_match(buf
, "blocked")) {
2624 set_bit(Blocked
, &rdev
->flags
);
2626 } else if (cmd_match(buf
, "-blocked")) {
2627 if (!test_bit(Faulty
, &rdev
->flags
) &&
2628 rdev
->badblocks
.unacked_exist
) {
2629 /* metadata handler doesn't understand badblocks,
2630 * so we need to fail the device
2632 md_error(rdev
->mddev
, rdev
);
2634 clear_bit(Blocked
, &rdev
->flags
);
2635 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2636 wake_up(&rdev
->blocked_wait
);
2637 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2638 md_wakeup_thread(rdev
->mddev
->thread
);
2641 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2642 set_bit(In_sync
, &rdev
->flags
);
2644 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2645 if (rdev
->mddev
->pers
== NULL
) {
2646 clear_bit(In_sync
, &rdev
->flags
);
2647 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2648 rdev
->raid_disk
= -1;
2651 } else if (cmd_match(buf
, "write_error")) {
2652 set_bit(WriteErrorSeen
, &rdev
->flags
);
2654 } else if (cmd_match(buf
, "-write_error")) {
2655 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2657 } else if (cmd_match(buf
, "want_replacement")) {
2658 /* Any non-spare device that is not a replacement can
2659 * become want_replacement at any time, but we then need to
2660 * check if recovery is needed.
2662 if (rdev
->raid_disk
>= 0 &&
2663 !test_bit(Replacement
, &rdev
->flags
))
2664 set_bit(WantReplacement
, &rdev
->flags
);
2665 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2666 md_wakeup_thread(rdev
->mddev
->thread
);
2668 } else if (cmd_match(buf
, "-want_replacement")) {
2669 /* Clearing 'want_replacement' is always allowed.
2670 * Once replacements starts it is too late though.
2673 clear_bit(WantReplacement
, &rdev
->flags
);
2674 } else if (cmd_match(buf
, "replacement")) {
2675 /* Can only set a device as a replacement when array has not
2676 * yet been started. Once running, replacement is automatic
2677 * from spares, or by assigning 'slot'.
2679 if (rdev
->mddev
->pers
)
2682 set_bit(Replacement
, &rdev
->flags
);
2685 } else if (cmd_match(buf
, "-replacement")) {
2686 /* Similarly, can only clear Replacement before start */
2687 if (rdev
->mddev
->pers
)
2690 clear_bit(Replacement
, &rdev
->flags
);
2695 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2696 return err
? err
: len
;
2698 static struct rdev_sysfs_entry rdev_state
=
2699 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2702 errors_show(struct md_rdev
*rdev
, char *page
)
2704 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2708 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2711 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2712 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2713 atomic_set(&rdev
->corrected_errors
, n
);
2718 static struct rdev_sysfs_entry rdev_errors
=
2719 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2722 slot_show(struct md_rdev
*rdev
, char *page
)
2724 if (rdev
->raid_disk
< 0)
2725 return sprintf(page
, "none\n");
2727 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2731 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2735 int slot
= simple_strtoul(buf
, &e
, 10);
2736 if (strncmp(buf
, "none", 4)==0)
2738 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2740 if (rdev
->mddev
->pers
&& slot
== -1) {
2741 /* Setting 'slot' on an active array requires also
2742 * updating the 'rd%d' link, and communicating
2743 * with the personality with ->hot_*_disk.
2744 * For now we only support removing
2745 * failed/spare devices. This normally happens automatically,
2746 * but not when the metadata is externally managed.
2748 if (rdev
->raid_disk
== -1)
2750 /* personality does all needed checks */
2751 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2753 clear_bit(Blocked
, &rdev
->flags
);
2754 remove_and_add_spares(rdev
->mddev
, rdev
);
2755 if (rdev
->raid_disk
>= 0)
2757 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2758 md_wakeup_thread(rdev
->mddev
->thread
);
2759 } else if (rdev
->mddev
->pers
) {
2760 /* Activating a spare .. or possibly reactivating
2761 * if we ever get bitmaps working here.
2764 if (rdev
->raid_disk
!= -1)
2767 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2770 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2773 if (slot
>= rdev
->mddev
->raid_disks
&&
2774 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2777 rdev
->raid_disk
= slot
;
2778 if (test_bit(In_sync
, &rdev
->flags
))
2779 rdev
->saved_raid_disk
= slot
;
2781 rdev
->saved_raid_disk
= -1;
2782 clear_bit(In_sync
, &rdev
->flags
);
2783 clear_bit(Bitmap_sync
, &rdev
->flags
);
2784 err
= rdev
->mddev
->pers
->
2785 hot_add_disk(rdev
->mddev
, rdev
);
2787 rdev
->raid_disk
= -1;
2790 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2791 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2792 /* failure here is OK */;
2793 /* don't wakeup anyone, leave that to userspace. */
2795 if (slot
>= rdev
->mddev
->raid_disks
&&
2796 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2798 rdev
->raid_disk
= slot
;
2799 /* assume it is working */
2800 clear_bit(Faulty
, &rdev
->flags
);
2801 clear_bit(WriteMostly
, &rdev
->flags
);
2802 set_bit(In_sync
, &rdev
->flags
);
2803 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2808 static struct rdev_sysfs_entry rdev_slot
=
2809 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2812 offset_show(struct md_rdev
*rdev
, char *page
)
2814 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2818 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2820 unsigned long long offset
;
2821 if (kstrtoull(buf
, 10, &offset
) < 0)
2823 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2825 if (rdev
->sectors
&& rdev
->mddev
->external
)
2826 /* Must set offset before size, so overlap checks
2829 rdev
->data_offset
= offset
;
2830 rdev
->new_data_offset
= offset
;
2834 static struct rdev_sysfs_entry rdev_offset
=
2835 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2837 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2839 return sprintf(page
, "%llu\n",
2840 (unsigned long long)rdev
->new_data_offset
);
2843 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2844 const char *buf
, size_t len
)
2846 unsigned long long new_offset
;
2847 struct mddev
*mddev
= rdev
->mddev
;
2849 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2852 if (mddev
->sync_thread
)
2854 if (new_offset
== rdev
->data_offset
)
2855 /* reset is always permitted */
2857 else if (new_offset
> rdev
->data_offset
) {
2858 /* must not push array size beyond rdev_sectors */
2859 if (new_offset
- rdev
->data_offset
2860 + mddev
->dev_sectors
> rdev
->sectors
)
2863 /* Metadata worries about other space details. */
2865 /* decreasing the offset is inconsistent with a backwards
2868 if (new_offset
< rdev
->data_offset
&&
2869 mddev
->reshape_backwards
)
2871 /* Increasing offset is inconsistent with forwards
2872 * reshape. reshape_direction should be set to
2873 * 'backwards' first.
2875 if (new_offset
> rdev
->data_offset
&&
2876 !mddev
->reshape_backwards
)
2879 if (mddev
->pers
&& mddev
->persistent
&&
2880 !super_types
[mddev
->major_version
]
2881 .allow_new_offset(rdev
, new_offset
))
2883 rdev
->new_data_offset
= new_offset
;
2884 if (new_offset
> rdev
->data_offset
)
2885 mddev
->reshape_backwards
= 1;
2886 else if (new_offset
< rdev
->data_offset
)
2887 mddev
->reshape_backwards
= 0;
2891 static struct rdev_sysfs_entry rdev_new_offset
=
2892 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2895 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2897 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2900 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2902 /* check if two start/length pairs overlap */
2910 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2912 unsigned long long blocks
;
2915 if (kstrtoull(buf
, 10, &blocks
) < 0)
2918 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2919 return -EINVAL
; /* sector conversion overflow */
2922 if (new != blocks
* 2)
2923 return -EINVAL
; /* unsigned long long to sector_t overflow */
2930 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2932 struct mddev
*my_mddev
= rdev
->mddev
;
2933 sector_t oldsectors
= rdev
->sectors
;
2936 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2938 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2939 return -EINVAL
; /* too confusing */
2940 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2941 if (my_mddev
->persistent
) {
2942 sectors
= super_types
[my_mddev
->major_version
].
2943 rdev_size_change(rdev
, sectors
);
2946 } else if (!sectors
)
2947 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2949 if (!my_mddev
->pers
->resize
)
2950 /* Cannot change size for RAID0 or Linear etc */
2953 if (sectors
< my_mddev
->dev_sectors
)
2954 return -EINVAL
; /* component must fit device */
2956 rdev
->sectors
= sectors
;
2957 if (sectors
> oldsectors
&& my_mddev
->external
) {
2958 /* Need to check that all other rdevs with the same
2959 * ->bdev do not overlap. 'rcu' is sufficient to walk
2960 * the rdev lists safely.
2961 * This check does not provide a hard guarantee, it
2962 * just helps avoid dangerous mistakes.
2964 struct mddev
*mddev
;
2966 struct list_head
*tmp
;
2969 for_each_mddev(mddev
, tmp
) {
2970 struct md_rdev
*rdev2
;
2972 rdev_for_each(rdev2
, mddev
)
2973 if (rdev
->bdev
== rdev2
->bdev
&&
2975 overlaps(rdev
->data_offset
, rdev
->sectors
,
2988 /* Someone else could have slipped in a size
2989 * change here, but doing so is just silly.
2990 * We put oldsectors back because we *know* it is
2991 * safe, and trust userspace not to race with
2994 rdev
->sectors
= oldsectors
;
3001 static struct rdev_sysfs_entry rdev_size
=
3002 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3004 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3006 unsigned long long recovery_start
= rdev
->recovery_offset
;
3008 if (test_bit(In_sync
, &rdev
->flags
) ||
3009 recovery_start
== MaxSector
)
3010 return sprintf(page
, "none\n");
3012 return sprintf(page
, "%llu\n", recovery_start
);
3015 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3017 unsigned long long recovery_start
;
3019 if (cmd_match(buf
, "none"))
3020 recovery_start
= MaxSector
;
3021 else if (kstrtoull(buf
, 10, &recovery_start
))
3024 if (rdev
->mddev
->pers
&&
3025 rdev
->raid_disk
>= 0)
3028 rdev
->recovery_offset
= recovery_start
;
3029 if (recovery_start
== MaxSector
)
3030 set_bit(In_sync
, &rdev
->flags
);
3032 clear_bit(In_sync
, &rdev
->flags
);
3036 static struct rdev_sysfs_entry rdev_recovery_start
=
3037 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3040 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3042 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3044 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3046 return badblocks_show(&rdev
->badblocks
, page
, 0);
3048 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3050 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3051 /* Maybe that ack was all we needed */
3052 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3053 wake_up(&rdev
->blocked_wait
);
3056 static struct rdev_sysfs_entry rdev_bad_blocks
=
3057 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3059 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3061 return badblocks_show(&rdev
->badblocks
, page
, 1);
3063 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3065 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3067 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3068 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3070 static struct attribute
*rdev_default_attrs
[] = {
3075 &rdev_new_offset
.attr
,
3077 &rdev_recovery_start
.attr
,
3078 &rdev_bad_blocks
.attr
,
3079 &rdev_unack_bad_blocks
.attr
,
3083 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3085 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3086 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3087 struct mddev
*mddev
= rdev
->mddev
;
3093 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3095 if (rdev
->mddev
== NULL
)
3098 rv
= entry
->show(rdev
, page
);
3099 mddev_unlock(mddev
);
3105 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3106 const char *page
, size_t length
)
3108 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3109 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3111 struct mddev
*mddev
= rdev
->mddev
;
3115 if (!capable(CAP_SYS_ADMIN
))
3117 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3119 if (rdev
->mddev
== NULL
)
3122 rv
= entry
->store(rdev
, page
, length
);
3123 mddev_unlock(mddev
);
3128 static void rdev_free(struct kobject
*ko
)
3130 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3133 static const struct sysfs_ops rdev_sysfs_ops
= {
3134 .show
= rdev_attr_show
,
3135 .store
= rdev_attr_store
,
3137 static struct kobj_type rdev_ktype
= {
3138 .release
= rdev_free
,
3139 .sysfs_ops
= &rdev_sysfs_ops
,
3140 .default_attrs
= rdev_default_attrs
,
3143 int md_rdev_init(struct md_rdev
*rdev
)
3146 rdev
->saved_raid_disk
= -1;
3147 rdev
->raid_disk
= -1;
3149 rdev
->data_offset
= 0;
3150 rdev
->new_data_offset
= 0;
3151 rdev
->sb_events
= 0;
3152 rdev
->last_read_error
.tv_sec
= 0;
3153 rdev
->last_read_error
.tv_nsec
= 0;
3154 rdev
->sb_loaded
= 0;
3155 rdev
->bb_page
= NULL
;
3156 atomic_set(&rdev
->nr_pending
, 0);
3157 atomic_set(&rdev
->read_errors
, 0);
3158 atomic_set(&rdev
->corrected_errors
, 0);
3160 INIT_LIST_HEAD(&rdev
->same_set
);
3161 init_waitqueue_head(&rdev
->blocked_wait
);
3163 /* Add space to store bad block list.
3164 * This reserves the space even on arrays where it cannot
3165 * be used - I wonder if that matters
3167 rdev
->badblocks
.count
= 0;
3168 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3169 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3170 seqlock_init(&rdev
->badblocks
.lock
);
3171 if (rdev
->badblocks
.page
== NULL
)
3176 EXPORT_SYMBOL_GPL(md_rdev_init
);
3178 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3180 * mark the device faulty if:
3182 * - the device is nonexistent (zero size)
3183 * - the device has no valid superblock
3185 * a faulty rdev _never_ has rdev->sb set.
3187 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3189 char b
[BDEVNAME_SIZE
];
3191 struct md_rdev
*rdev
;
3194 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3196 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3197 return ERR_PTR(-ENOMEM
);
3200 err
= md_rdev_init(rdev
);
3203 err
= alloc_disk_sb(rdev
);
3207 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3211 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3213 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3216 "md: %s has zero or unknown size, marking faulty!\n",
3217 bdevname(rdev
->bdev
,b
));
3222 if (super_format
>= 0) {
3223 err
= super_types
[super_format
].
3224 load_super(rdev
, NULL
, super_minor
);
3225 if (err
== -EINVAL
) {
3227 "md: %s does not have a valid v%d.%d "
3228 "superblock, not importing!\n",
3229 bdevname(rdev
->bdev
,b
),
3230 super_format
, super_minor
);
3235 "md: could not read %s's sb, not importing!\n",
3236 bdevname(rdev
->bdev
,b
));
3246 md_rdev_clear(rdev
);
3248 return ERR_PTR(err
);
3252 * Check a full RAID array for plausibility
3255 static void analyze_sbs(struct mddev
*mddev
)
3258 struct md_rdev
*rdev
, *freshest
, *tmp
;
3259 char b
[BDEVNAME_SIZE
];
3262 rdev_for_each_safe(rdev
, tmp
, mddev
)
3263 switch (super_types
[mddev
->major_version
].
3264 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3272 "md: fatal superblock inconsistency in %s"
3273 " -- removing from array\n",
3274 bdevname(rdev
->bdev
,b
));
3275 kick_rdev_from_array(rdev
);
3278 super_types
[mddev
->major_version
].
3279 validate_super(mddev
, freshest
);
3282 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3283 if (mddev
->max_disks
&&
3284 (rdev
->desc_nr
>= mddev
->max_disks
||
3285 i
> mddev
->max_disks
)) {
3287 "md: %s: %s: only %d devices permitted\n",
3288 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3290 kick_rdev_from_array(rdev
);
3293 if (rdev
!= freshest
)
3294 if (super_types
[mddev
->major_version
].
3295 validate_super(mddev
, rdev
)) {
3296 printk(KERN_WARNING
"md: kicking non-fresh %s"
3298 bdevname(rdev
->bdev
,b
));
3299 kick_rdev_from_array(rdev
);
3302 if (mddev
->level
== LEVEL_MULTIPATH
) {
3303 rdev
->desc_nr
= i
++;
3304 rdev
->raid_disk
= rdev
->desc_nr
;
3305 set_bit(In_sync
, &rdev
->flags
);
3306 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3307 rdev
->raid_disk
= -1;
3308 clear_bit(In_sync
, &rdev
->flags
);
3313 /* Read a fixed-point number.
3314 * Numbers in sysfs attributes should be in "standard" units where
3315 * possible, so time should be in seconds.
3316 * However we internally use a a much smaller unit such as
3317 * milliseconds or jiffies.
3318 * This function takes a decimal number with a possible fractional
3319 * component, and produces an integer which is the result of
3320 * multiplying that number by 10^'scale'.
3321 * all without any floating-point arithmetic.
3323 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3325 unsigned long result
= 0;
3327 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3330 else if (decimals
< scale
) {
3333 result
= result
* 10 + value
;
3345 while (decimals
< scale
) {
3353 static void md_safemode_timeout(unsigned long data
);
3356 safe_delay_show(struct mddev
*mddev
, char *page
)
3358 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3359 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3362 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3366 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3369 mddev
->safemode_delay
= 0;
3371 unsigned long old_delay
= mddev
->safemode_delay
;
3372 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3373 if (mddev
->safemode_delay
== 0)
3374 mddev
->safemode_delay
= 1;
3375 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3376 md_safemode_timeout((unsigned long)mddev
);
3380 static struct md_sysfs_entry md_safe_delay
=
3381 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3384 level_show(struct mddev
*mddev
, char *page
)
3386 struct md_personality
*p
= mddev
->pers
;
3388 return sprintf(page
, "%s\n", p
->name
);
3389 else if (mddev
->clevel
[0])
3390 return sprintf(page
, "%s\n", mddev
->clevel
);
3391 else if (mddev
->level
!= LEVEL_NONE
)
3392 return sprintf(page
, "%d\n", mddev
->level
);
3398 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3402 struct md_personality
*pers
;
3405 struct md_rdev
*rdev
;
3407 if (mddev
->pers
== NULL
) {
3410 if (len
>= sizeof(mddev
->clevel
))
3412 strncpy(mddev
->clevel
, buf
, len
);
3413 if (mddev
->clevel
[len
-1] == '\n')
3415 mddev
->clevel
[len
] = 0;
3416 mddev
->level
= LEVEL_NONE
;
3422 /* request to change the personality. Need to ensure:
3423 * - array is not engaged in resync/recovery/reshape
3424 * - old personality can be suspended
3425 * - new personality will access other array.
3428 if (mddev
->sync_thread
||
3429 mddev
->reshape_position
!= MaxSector
||
3430 mddev
->sysfs_active
)
3433 if (!mddev
->pers
->quiesce
) {
3434 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3435 mdname(mddev
), mddev
->pers
->name
);
3439 /* Now find the new personality */
3440 if (len
== 0 || len
>= sizeof(clevel
))
3442 strncpy(clevel
, buf
, len
);
3443 if (clevel
[len
-1] == '\n')
3446 if (kstrtol(clevel
, 10, &level
))
3449 if (request_module("md-%s", clevel
) != 0)
3450 request_module("md-level-%s", clevel
);
3451 spin_lock(&pers_lock
);
3452 pers
= find_pers(level
, clevel
);
3453 if (!pers
|| !try_module_get(pers
->owner
)) {
3454 spin_unlock(&pers_lock
);
3455 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3458 spin_unlock(&pers_lock
);
3460 if (pers
== mddev
->pers
) {
3461 /* Nothing to do! */
3462 module_put(pers
->owner
);
3465 if (!pers
->takeover
) {
3466 module_put(pers
->owner
);
3467 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3468 mdname(mddev
), clevel
);
3472 rdev_for_each(rdev
, mddev
)
3473 rdev
->new_raid_disk
= rdev
->raid_disk
;
3475 /* ->takeover must set new_* and/or delta_disks
3476 * if it succeeds, and may set them when it fails.
3478 priv
= pers
->takeover(mddev
);
3480 mddev
->new_level
= mddev
->level
;
3481 mddev
->new_layout
= mddev
->layout
;
3482 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3483 mddev
->raid_disks
-= mddev
->delta_disks
;
3484 mddev
->delta_disks
= 0;
3485 mddev
->reshape_backwards
= 0;
3486 module_put(pers
->owner
);
3487 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3488 mdname(mddev
), clevel
);
3489 return PTR_ERR(priv
);
3492 /* Looks like we have a winner */
3493 mddev_suspend(mddev
);
3494 mddev
->pers
->stop(mddev
);
3496 if (mddev
->pers
->sync_request
== NULL
&&
3497 pers
->sync_request
!= NULL
) {
3498 /* need to add the md_redundancy_group */
3499 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3501 "md: cannot register extra attributes for %s\n",
3503 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3505 if (mddev
->pers
->sync_request
!= NULL
&&
3506 pers
->sync_request
== NULL
) {
3507 /* need to remove the md_redundancy_group */
3508 if (mddev
->to_remove
== NULL
)
3509 mddev
->to_remove
= &md_redundancy_group
;
3512 if (mddev
->pers
->sync_request
== NULL
&&
3514 /* We are converting from a no-redundancy array
3515 * to a redundancy array and metadata is managed
3516 * externally so we need to be sure that writes
3517 * won't block due to a need to transition
3519 * until external management is started.
3522 mddev
->safemode_delay
= 0;
3523 mddev
->safemode
= 0;
3526 rdev_for_each(rdev
, mddev
) {
3527 if (rdev
->raid_disk
< 0)
3529 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3530 rdev
->new_raid_disk
= -1;
3531 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3533 sysfs_unlink_rdev(mddev
, rdev
);
3535 rdev_for_each(rdev
, mddev
) {
3536 if (rdev
->raid_disk
< 0)
3538 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3540 rdev
->raid_disk
= rdev
->new_raid_disk
;
3541 if (rdev
->raid_disk
< 0)
3542 clear_bit(In_sync
, &rdev
->flags
);
3544 if (sysfs_link_rdev(mddev
, rdev
))
3545 printk(KERN_WARNING
"md: cannot register rd%d"
3546 " for %s after level change\n",
3547 rdev
->raid_disk
, mdname(mddev
));
3551 module_put(mddev
->pers
->owner
);
3553 mddev
->private = priv
;
3554 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3555 mddev
->level
= mddev
->new_level
;
3556 mddev
->layout
= mddev
->new_layout
;
3557 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3558 mddev
->delta_disks
= 0;
3559 mddev
->reshape_backwards
= 0;
3560 mddev
->degraded
= 0;
3561 if (mddev
->pers
->sync_request
== NULL
) {
3562 /* this is now an array without redundancy, so
3563 * it must always be in_sync
3566 del_timer_sync(&mddev
->safemode_timer
);
3568 blk_set_stacking_limits(&mddev
->queue
->limits
);
3570 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3571 mddev_resume(mddev
);
3573 md_update_sb(mddev
, 1);
3574 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3575 md_new_event(mddev
);
3579 static struct md_sysfs_entry md_level
=
3580 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3583 layout_show(struct mddev
*mddev
, char *page
)
3585 /* just a number, not meaningful for all levels */
3586 if (mddev
->reshape_position
!= MaxSector
&&
3587 mddev
->layout
!= mddev
->new_layout
)
3588 return sprintf(page
, "%d (%d)\n",
3589 mddev
->new_layout
, mddev
->layout
);
3590 return sprintf(page
, "%d\n", mddev
->layout
);
3594 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3597 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3599 if (!*buf
|| (*e
&& *e
!= '\n'))
3604 if (mddev
->pers
->check_reshape
== NULL
)
3608 mddev
->new_layout
= n
;
3609 err
= mddev
->pers
->check_reshape(mddev
);
3611 mddev
->new_layout
= mddev
->layout
;
3615 mddev
->new_layout
= n
;
3616 if (mddev
->reshape_position
== MaxSector
)
3621 static struct md_sysfs_entry md_layout
=
3622 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3625 raid_disks_show(struct mddev
*mddev
, char *page
)
3627 if (mddev
->raid_disks
== 0)
3629 if (mddev
->reshape_position
!= MaxSector
&&
3630 mddev
->delta_disks
!= 0)
3631 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3632 mddev
->raid_disks
- mddev
->delta_disks
);
3633 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3636 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3639 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3643 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3645 if (!*buf
|| (*e
&& *e
!= '\n'))
3649 rv
= update_raid_disks(mddev
, n
);
3650 else if (mddev
->reshape_position
!= MaxSector
) {
3651 struct md_rdev
*rdev
;
3652 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3654 rdev_for_each(rdev
, mddev
) {
3656 rdev
->data_offset
< rdev
->new_data_offset
)
3659 rdev
->data_offset
> rdev
->new_data_offset
)
3662 mddev
->delta_disks
= n
- olddisks
;
3663 mddev
->raid_disks
= n
;
3664 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3666 mddev
->raid_disks
= n
;
3667 return rv
? rv
: len
;
3669 static struct md_sysfs_entry md_raid_disks
=
3670 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3673 chunk_size_show(struct mddev
*mddev
, char *page
)
3675 if (mddev
->reshape_position
!= MaxSector
&&
3676 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3677 return sprintf(page
, "%d (%d)\n",
3678 mddev
->new_chunk_sectors
<< 9,
3679 mddev
->chunk_sectors
<< 9);
3680 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3684 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3687 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3689 if (!*buf
|| (*e
&& *e
!= '\n'))
3694 if (mddev
->pers
->check_reshape
== NULL
)
3698 mddev
->new_chunk_sectors
= n
>> 9;
3699 err
= mddev
->pers
->check_reshape(mddev
);
3701 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3705 mddev
->new_chunk_sectors
= n
>> 9;
3706 if (mddev
->reshape_position
== MaxSector
)
3707 mddev
->chunk_sectors
= n
>> 9;
3711 static struct md_sysfs_entry md_chunk_size
=
3712 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3715 resync_start_show(struct mddev
*mddev
, char *page
)
3717 if (mddev
->recovery_cp
== MaxSector
)
3718 return sprintf(page
, "none\n");
3719 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3723 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3726 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3728 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3730 if (cmd_match(buf
, "none"))
3732 else if (!*buf
|| (*e
&& *e
!= '\n'))
3735 mddev
->recovery_cp
= n
;
3737 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3740 static struct md_sysfs_entry md_resync_start
=
3741 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3744 * The array state can be:
3747 * No devices, no size, no level
3748 * Equivalent to STOP_ARRAY ioctl
3750 * May have some settings, but array is not active
3751 * all IO results in error
3752 * When written, doesn't tear down array, but just stops it
3753 * suspended (not supported yet)
3754 * All IO requests will block. The array can be reconfigured.
3755 * Writing this, if accepted, will block until array is quiescent
3757 * no resync can happen. no superblocks get written.
3758 * write requests fail
3760 * like readonly, but behaves like 'clean' on a write request.
3762 * clean - no pending writes, but otherwise active.
3763 * When written to inactive array, starts without resync
3764 * If a write request arrives then
3765 * if metadata is known, mark 'dirty' and switch to 'active'.
3766 * if not known, block and switch to write-pending
3767 * If written to an active array that has pending writes, then fails.
3769 * fully active: IO and resync can be happening.
3770 * When written to inactive array, starts with resync
3773 * clean, but writes are blocked waiting for 'active' to be written.
3776 * like active, but no writes have been seen for a while (100msec).
3779 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3780 write_pending
, active_idle
, bad_word
};
3781 static char *array_states
[] = {
3782 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3783 "write-pending", "active-idle", NULL
};
3785 static int match_word(const char *word
, char **list
)
3788 for (n
=0; list
[n
]; n
++)
3789 if (cmd_match(word
, list
[n
]))
3795 array_state_show(struct mddev
*mddev
, char *page
)
3797 enum array_state st
= inactive
;
3810 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3812 else if (mddev
->safemode
)
3818 if (list_empty(&mddev
->disks
) &&
3819 mddev
->raid_disks
== 0 &&
3820 mddev
->dev_sectors
== 0)
3825 return sprintf(page
, "%s\n", array_states
[st
]);
3828 static int do_md_stop(struct mddev
*mddev
, int ro
, struct block_device
*bdev
);
3829 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
);
3830 static int do_md_run(struct mddev
*mddev
);
3831 static int restart_array(struct mddev
*mddev
);
3834 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3837 enum array_state st
= match_word(buf
, array_states
);
3842 /* stopping an active array */
3843 err
= do_md_stop(mddev
, 0, NULL
);
3846 /* stopping an active array */
3848 err
= do_md_stop(mddev
, 2, NULL
);
3850 err
= 0; /* already inactive */
3853 break; /* not supported yet */
3856 err
= md_set_readonly(mddev
, NULL
);
3859 set_disk_ro(mddev
->gendisk
, 1);
3860 err
= do_md_run(mddev
);
3866 err
= md_set_readonly(mddev
, NULL
);
3867 else if (mddev
->ro
== 1)
3868 err
= restart_array(mddev
);
3871 set_disk_ro(mddev
->gendisk
, 0);
3875 err
= do_md_run(mddev
);
3880 restart_array(mddev
);
3881 spin_lock_irq(&mddev
->write_lock
);
3882 if (atomic_read(&mddev
->writes_pending
) == 0) {
3883 if (mddev
->in_sync
== 0) {
3885 if (mddev
->safemode
== 1)
3886 mddev
->safemode
= 0;
3887 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3892 spin_unlock_irq(&mddev
->write_lock
);
3898 restart_array(mddev
);
3899 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3900 wake_up(&mddev
->sb_wait
);
3904 set_disk_ro(mddev
->gendisk
, 0);
3905 err
= do_md_run(mddev
);
3910 /* these cannot be set */
3916 if (mddev
->hold_active
== UNTIL_IOCTL
)
3917 mddev
->hold_active
= 0;
3918 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3922 static struct md_sysfs_entry md_array_state
=
3923 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3926 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3927 return sprintf(page
, "%d\n",
3928 atomic_read(&mddev
->max_corr_read_errors
));
3932 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3935 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3937 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3938 atomic_set(&mddev
->max_corr_read_errors
, n
);
3944 static struct md_sysfs_entry max_corr_read_errors
=
3945 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3946 max_corrected_read_errors_store
);
3949 null_show(struct mddev
*mddev
, char *page
)
3955 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3957 /* buf must be %d:%d\n? giving major and minor numbers */
3958 /* The new device is added to the array.
3959 * If the array has a persistent superblock, we read the
3960 * superblock to initialise info and check validity.
3961 * Otherwise, only checking done is that in bind_rdev_to_array,
3962 * which mainly checks size.
3965 int major
= simple_strtoul(buf
, &e
, 10);
3968 struct md_rdev
*rdev
;
3971 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
3973 minor
= simple_strtoul(e
+1, &e
, 10);
3974 if (*e
&& *e
!= '\n')
3976 dev
= MKDEV(major
, minor
);
3977 if (major
!= MAJOR(dev
) ||
3978 minor
!= MINOR(dev
))
3981 if (mddev
->persistent
) {
3982 rdev
= md_import_device(dev
, mddev
->major_version
,
3983 mddev
->minor_version
);
3984 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
3985 struct md_rdev
*rdev0
3986 = list_entry(mddev
->disks
.next
,
3987 struct md_rdev
, same_set
);
3988 err
= super_types
[mddev
->major_version
]
3989 .load_super(rdev
, rdev0
, mddev
->minor_version
);
3993 } else if (mddev
->external
)
3994 rdev
= md_import_device(dev
, -2, -1);
3996 rdev
= md_import_device(dev
, -1, -1);
3999 return PTR_ERR(rdev
);
4000 err
= bind_rdev_to_array(rdev
, mddev
);
4004 return err
? err
: len
;
4007 static struct md_sysfs_entry md_new_device
=
4008 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4011 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4014 unsigned long chunk
, end_chunk
;
4018 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4020 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4021 if (buf
== end
) break;
4022 if (*end
== '-') { /* range */
4024 end_chunk
= simple_strtoul(buf
, &end
, 0);
4025 if (buf
== end
) break;
4027 if (*end
&& !isspace(*end
)) break;
4028 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4029 buf
= skip_spaces(end
);
4031 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4036 static struct md_sysfs_entry md_bitmap
=
4037 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4040 size_show(struct mddev
*mddev
, char *page
)
4042 return sprintf(page
, "%llu\n",
4043 (unsigned long long)mddev
->dev_sectors
/ 2);
4046 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4049 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4051 /* If array is inactive, we can reduce the component size, but
4052 * not increase it (except from 0).
4053 * If array is active, we can try an on-line resize
4056 int err
= strict_blocks_to_sectors(buf
, §ors
);
4061 err
= update_size(mddev
, sectors
);
4062 md_update_sb(mddev
, 1);
4064 if (mddev
->dev_sectors
== 0 ||
4065 mddev
->dev_sectors
> sectors
)
4066 mddev
->dev_sectors
= sectors
;
4070 return err
? err
: len
;
4073 static struct md_sysfs_entry md_size
=
4074 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4076 /* Metadata version.
4078 * 'none' for arrays with no metadata (good luck...)
4079 * 'external' for arrays with externally managed metadata,
4080 * or N.M for internally known formats
4083 metadata_show(struct mddev
*mddev
, char *page
)
4085 if (mddev
->persistent
)
4086 return sprintf(page
, "%d.%d\n",
4087 mddev
->major_version
, mddev
->minor_version
);
4088 else if (mddev
->external
)
4089 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4091 return sprintf(page
, "none\n");
4095 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4099 /* Changing the details of 'external' metadata is
4100 * always permitted. Otherwise there must be
4101 * no devices attached to the array.
4103 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4105 else if (!list_empty(&mddev
->disks
))
4108 if (cmd_match(buf
, "none")) {
4109 mddev
->persistent
= 0;
4110 mddev
->external
= 0;
4111 mddev
->major_version
= 0;
4112 mddev
->minor_version
= 90;
4115 if (strncmp(buf
, "external:", 9) == 0) {
4116 size_t namelen
= len
-9;
4117 if (namelen
>= sizeof(mddev
->metadata_type
))
4118 namelen
= sizeof(mddev
->metadata_type
)-1;
4119 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4120 mddev
->metadata_type
[namelen
] = 0;
4121 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4122 mddev
->metadata_type
[--namelen
] = 0;
4123 mddev
->persistent
= 0;
4124 mddev
->external
= 1;
4125 mddev
->major_version
= 0;
4126 mddev
->minor_version
= 90;
4129 major
= simple_strtoul(buf
, &e
, 10);
4130 if (e
==buf
|| *e
!= '.')
4133 minor
= simple_strtoul(buf
, &e
, 10);
4134 if (e
==buf
|| (*e
&& *e
!= '\n') )
4136 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4138 mddev
->major_version
= major
;
4139 mddev
->minor_version
= minor
;
4140 mddev
->persistent
= 1;
4141 mddev
->external
= 0;
4145 static struct md_sysfs_entry md_metadata
=
4146 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4149 action_show(struct mddev
*mddev
, char *page
)
4151 char *type
= "idle";
4152 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4154 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4155 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4156 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4158 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4159 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4161 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4165 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4168 return sprintf(page
, "%s\n", type
);
4172 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4174 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4177 if (cmd_match(page
, "frozen"))
4178 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4180 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4182 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4183 if (mddev
->sync_thread
) {
4184 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4185 md_reap_sync_thread(mddev
);
4187 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4188 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4190 else if (cmd_match(page
, "resync"))
4191 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4192 else if (cmd_match(page
, "recover")) {
4193 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4194 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4195 } else if (cmd_match(page
, "reshape")) {
4197 if (mddev
->pers
->start_reshape
== NULL
)
4199 err
= mddev
->pers
->start_reshape(mddev
);
4202 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4204 if (cmd_match(page
, "check"))
4205 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4206 else if (!cmd_match(page
, "repair"))
4208 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4209 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4211 if (mddev
->ro
== 2) {
4212 /* A write to sync_action is enough to justify
4213 * canceling read-auto mode
4216 md_wakeup_thread(mddev
->sync_thread
);
4218 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4219 md_wakeup_thread(mddev
->thread
);
4220 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4224 static struct md_sysfs_entry md_scan_mode
=
4225 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4228 last_sync_action_show(struct mddev
*mddev
, char *page
)
4230 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4233 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4236 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4238 return sprintf(page
, "%llu\n",
4239 (unsigned long long)
4240 atomic64_read(&mddev
->resync_mismatches
));
4243 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4246 sync_min_show(struct mddev
*mddev
, char *page
)
4248 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4249 mddev
->sync_speed_min
? "local": "system");
4253 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4257 if (strncmp(buf
, "system", 6)==0) {
4258 mddev
->sync_speed_min
= 0;
4261 min
= simple_strtoul(buf
, &e
, 10);
4262 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4264 mddev
->sync_speed_min
= min
;
4268 static struct md_sysfs_entry md_sync_min
=
4269 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4272 sync_max_show(struct mddev
*mddev
, char *page
)
4274 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4275 mddev
->sync_speed_max
? "local": "system");
4279 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4283 if (strncmp(buf
, "system", 6)==0) {
4284 mddev
->sync_speed_max
= 0;
4287 max
= simple_strtoul(buf
, &e
, 10);
4288 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4290 mddev
->sync_speed_max
= max
;
4294 static struct md_sysfs_entry md_sync_max
=
4295 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4298 degraded_show(struct mddev
*mddev
, char *page
)
4300 return sprintf(page
, "%d\n", mddev
->degraded
);
4302 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4305 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4307 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4311 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4315 if (kstrtol(buf
, 10, &n
))
4318 if (n
!= 0 && n
!= 1)
4321 mddev
->parallel_resync
= n
;
4323 if (mddev
->sync_thread
)
4324 wake_up(&resync_wait
);
4329 /* force parallel resync, even with shared block devices */
4330 static struct md_sysfs_entry md_sync_force_parallel
=
4331 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4332 sync_force_parallel_show
, sync_force_parallel_store
);
4335 sync_speed_show(struct mddev
*mddev
, char *page
)
4337 unsigned long resync
, dt
, db
;
4338 if (mddev
->curr_resync
== 0)
4339 return sprintf(page
, "none\n");
4340 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4341 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4343 db
= resync
- mddev
->resync_mark_cnt
;
4344 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4347 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4350 sync_completed_show(struct mddev
*mddev
, char *page
)
4352 unsigned long long max_sectors
, resync
;
4354 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4355 return sprintf(page
, "none\n");
4357 if (mddev
->curr_resync
== 1 ||
4358 mddev
->curr_resync
== 2)
4359 return sprintf(page
, "delayed\n");
4361 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4362 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4363 max_sectors
= mddev
->resync_max_sectors
;
4365 max_sectors
= mddev
->dev_sectors
;
4367 resync
= mddev
->curr_resync_completed
;
4368 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4371 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4374 min_sync_show(struct mddev
*mddev
, char *page
)
4376 return sprintf(page
, "%llu\n",
4377 (unsigned long long)mddev
->resync_min
);
4380 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4382 unsigned long long min
;
4383 if (kstrtoull(buf
, 10, &min
))
4385 if (min
> mddev
->resync_max
)
4387 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4390 /* Must be a multiple of chunk_size */
4391 if (mddev
->chunk_sectors
) {
4392 sector_t temp
= min
;
4393 if (sector_div(temp
, mddev
->chunk_sectors
))
4396 mddev
->resync_min
= min
;
4401 static struct md_sysfs_entry md_min_sync
=
4402 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4405 max_sync_show(struct mddev
*mddev
, char *page
)
4407 if (mddev
->resync_max
== MaxSector
)
4408 return sprintf(page
, "max\n");
4410 return sprintf(page
, "%llu\n",
4411 (unsigned long long)mddev
->resync_max
);
4414 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4416 if (strncmp(buf
, "max", 3) == 0)
4417 mddev
->resync_max
= MaxSector
;
4419 unsigned long long max
;
4420 if (kstrtoull(buf
, 10, &max
))
4422 if (max
< mddev
->resync_min
)
4424 if (max
< mddev
->resync_max
&&
4426 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4429 /* Must be a multiple of chunk_size */
4430 if (mddev
->chunk_sectors
) {
4431 sector_t temp
= max
;
4432 if (sector_div(temp
, mddev
->chunk_sectors
))
4435 mddev
->resync_max
= max
;
4437 wake_up(&mddev
->recovery_wait
);
4441 static struct md_sysfs_entry md_max_sync
=
4442 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4445 suspend_lo_show(struct mddev
*mddev
, char *page
)
4447 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4451 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4454 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4455 unsigned long long old
= mddev
->suspend_lo
;
4457 if (mddev
->pers
== NULL
||
4458 mddev
->pers
->quiesce
== NULL
)
4460 if (buf
== e
|| (*e
&& *e
!= '\n'))
4463 mddev
->suspend_lo
= new;
4465 /* Shrinking suspended region */
4466 mddev
->pers
->quiesce(mddev
, 2);
4468 /* Expanding suspended region - need to wait */
4469 mddev
->pers
->quiesce(mddev
, 1);
4470 mddev
->pers
->quiesce(mddev
, 0);
4474 static struct md_sysfs_entry md_suspend_lo
=
4475 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4478 suspend_hi_show(struct mddev
*mddev
, char *page
)
4480 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4484 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4487 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4488 unsigned long long old
= mddev
->suspend_hi
;
4490 if (mddev
->pers
== NULL
||
4491 mddev
->pers
->quiesce
== NULL
)
4493 if (buf
== e
|| (*e
&& *e
!= '\n'))
4496 mddev
->suspend_hi
= new;
4498 /* Shrinking suspended region */
4499 mddev
->pers
->quiesce(mddev
, 2);
4501 /* Expanding suspended region - need to wait */
4502 mddev
->pers
->quiesce(mddev
, 1);
4503 mddev
->pers
->quiesce(mddev
, 0);
4507 static struct md_sysfs_entry md_suspend_hi
=
4508 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4511 reshape_position_show(struct mddev
*mddev
, char *page
)
4513 if (mddev
->reshape_position
!= MaxSector
)
4514 return sprintf(page
, "%llu\n",
4515 (unsigned long long)mddev
->reshape_position
);
4516 strcpy(page
, "none\n");
4521 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4523 struct md_rdev
*rdev
;
4525 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4528 if (buf
== e
|| (*e
&& *e
!= '\n'))
4530 mddev
->reshape_position
= new;
4531 mddev
->delta_disks
= 0;
4532 mddev
->reshape_backwards
= 0;
4533 mddev
->new_level
= mddev
->level
;
4534 mddev
->new_layout
= mddev
->layout
;
4535 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4536 rdev_for_each(rdev
, mddev
)
4537 rdev
->new_data_offset
= rdev
->data_offset
;
4541 static struct md_sysfs_entry md_reshape_position
=
4542 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4543 reshape_position_store
);
4546 reshape_direction_show(struct mddev
*mddev
, char *page
)
4548 return sprintf(page
, "%s\n",
4549 mddev
->reshape_backwards
? "backwards" : "forwards");
4553 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4556 if (cmd_match(buf
, "forwards"))
4558 else if (cmd_match(buf
, "backwards"))
4562 if (mddev
->reshape_backwards
== backwards
)
4565 /* check if we are allowed to change */
4566 if (mddev
->delta_disks
)
4569 if (mddev
->persistent
&&
4570 mddev
->major_version
== 0)
4573 mddev
->reshape_backwards
= backwards
;
4577 static struct md_sysfs_entry md_reshape_direction
=
4578 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4579 reshape_direction_store
);
4582 array_size_show(struct mddev
*mddev
, char *page
)
4584 if (mddev
->external_size
)
4585 return sprintf(page
, "%llu\n",
4586 (unsigned long long)mddev
->array_sectors
/2);
4588 return sprintf(page
, "default\n");
4592 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4596 if (strncmp(buf
, "default", 7) == 0) {
4598 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4600 sectors
= mddev
->array_sectors
;
4602 mddev
->external_size
= 0;
4604 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4606 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4609 mddev
->external_size
= 1;
4612 mddev
->array_sectors
= sectors
;
4614 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4615 revalidate_disk(mddev
->gendisk
);
4620 static struct md_sysfs_entry md_array_size
=
4621 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4624 static struct attribute
*md_default_attrs
[] = {
4627 &md_raid_disks
.attr
,
4628 &md_chunk_size
.attr
,
4630 &md_resync_start
.attr
,
4632 &md_new_device
.attr
,
4633 &md_safe_delay
.attr
,
4634 &md_array_state
.attr
,
4635 &md_reshape_position
.attr
,
4636 &md_reshape_direction
.attr
,
4637 &md_array_size
.attr
,
4638 &max_corr_read_errors
.attr
,
4642 static struct attribute
*md_redundancy_attrs
[] = {
4644 &md_last_scan_mode
.attr
,
4645 &md_mismatches
.attr
,
4648 &md_sync_speed
.attr
,
4649 &md_sync_force_parallel
.attr
,
4650 &md_sync_completed
.attr
,
4653 &md_suspend_lo
.attr
,
4654 &md_suspend_hi
.attr
,
4659 static struct attribute_group md_redundancy_group
= {
4661 .attrs
= md_redundancy_attrs
,
4665 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4667 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4668 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4673 spin_lock(&all_mddevs_lock
);
4674 if (list_empty(&mddev
->all_mddevs
)) {
4675 spin_unlock(&all_mddevs_lock
);
4679 spin_unlock(&all_mddevs_lock
);
4681 rv
= mddev_lock(mddev
);
4683 rv
= entry
->show(mddev
, page
);
4684 mddev_unlock(mddev
);
4691 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4692 const char *page
, size_t length
)
4694 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4695 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4700 if (!capable(CAP_SYS_ADMIN
))
4702 spin_lock(&all_mddevs_lock
);
4703 if (list_empty(&mddev
->all_mddevs
)) {
4704 spin_unlock(&all_mddevs_lock
);
4708 spin_unlock(&all_mddevs_lock
);
4709 if (entry
->store
== new_dev_store
)
4710 flush_workqueue(md_misc_wq
);
4711 rv
= mddev_lock(mddev
);
4713 rv
= entry
->store(mddev
, page
, length
);
4714 mddev_unlock(mddev
);
4720 static void md_free(struct kobject
*ko
)
4722 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4724 if (mddev
->sysfs_state
)
4725 sysfs_put(mddev
->sysfs_state
);
4727 if (mddev
->gendisk
) {
4728 del_gendisk(mddev
->gendisk
);
4729 put_disk(mddev
->gendisk
);
4732 blk_cleanup_queue(mddev
->queue
);
4737 static const struct sysfs_ops md_sysfs_ops
= {
4738 .show
= md_attr_show
,
4739 .store
= md_attr_store
,
4741 static struct kobj_type md_ktype
= {
4743 .sysfs_ops
= &md_sysfs_ops
,
4744 .default_attrs
= md_default_attrs
,
4749 static void mddev_delayed_delete(struct work_struct
*ws
)
4751 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4753 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4754 kobject_del(&mddev
->kobj
);
4755 kobject_put(&mddev
->kobj
);
4758 static int md_alloc(dev_t dev
, char *name
)
4760 static DEFINE_MUTEX(disks_mutex
);
4761 struct mddev
*mddev
= mddev_find(dev
);
4762 struct gendisk
*disk
;
4771 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4772 shift
= partitioned
? MdpMinorShift
: 0;
4773 unit
= MINOR(mddev
->unit
) >> shift
;
4775 /* wait for any previous instance of this device to be
4776 * completely removed (mddev_delayed_delete).
4778 flush_workqueue(md_misc_wq
);
4780 mutex_lock(&disks_mutex
);
4786 /* Need to ensure that 'name' is not a duplicate.
4788 struct mddev
*mddev2
;
4789 spin_lock(&all_mddevs_lock
);
4791 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4792 if (mddev2
->gendisk
&&
4793 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4794 spin_unlock(&all_mddevs_lock
);
4797 spin_unlock(&all_mddevs_lock
);
4801 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4804 mddev
->queue
->queuedata
= mddev
;
4806 blk_queue_make_request(mddev
->queue
, md_make_request
);
4807 blk_set_stacking_limits(&mddev
->queue
->limits
);
4809 disk
= alloc_disk(1 << shift
);
4811 blk_cleanup_queue(mddev
->queue
);
4812 mddev
->queue
= NULL
;
4815 disk
->major
= MAJOR(mddev
->unit
);
4816 disk
->first_minor
= unit
<< shift
;
4818 strcpy(disk
->disk_name
, name
);
4819 else if (partitioned
)
4820 sprintf(disk
->disk_name
, "md_d%d", unit
);
4822 sprintf(disk
->disk_name
, "md%d", unit
);
4823 disk
->fops
= &md_fops
;
4824 disk
->private_data
= mddev
;
4825 disk
->queue
= mddev
->queue
;
4826 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4827 /* Allow extended partitions. This makes the
4828 * 'mdp' device redundant, but we can't really
4831 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4832 mddev
->gendisk
= disk
;
4833 /* As soon as we call add_disk(), another thread could get
4834 * through to md_open, so make sure it doesn't get too far
4836 mutex_lock(&mddev
->open_mutex
);
4839 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4840 &disk_to_dev(disk
)->kobj
, "%s", "md");
4842 /* This isn't possible, but as kobject_init_and_add is marked
4843 * __must_check, we must do something with the result
4845 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4849 if (mddev
->kobj
.sd
&&
4850 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4851 printk(KERN_DEBUG
"pointless warning\n");
4852 mutex_unlock(&mddev
->open_mutex
);
4854 mutex_unlock(&disks_mutex
);
4855 if (!error
&& mddev
->kobj
.sd
) {
4856 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4857 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4863 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4865 md_alloc(dev
, NULL
);
4869 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4871 /* val must be "md_*" where * is not all digits.
4872 * We allocate an array with a large free minor number, and
4873 * set the name to val. val must not already be an active name.
4875 int len
= strlen(val
);
4876 char buf
[DISK_NAME_LEN
];
4878 while (len
&& val
[len
-1] == '\n')
4880 if (len
>= DISK_NAME_LEN
)
4882 strlcpy(buf
, val
, len
+1);
4883 if (strncmp(buf
, "md_", 3) != 0)
4885 return md_alloc(0, buf
);
4888 static void md_safemode_timeout(unsigned long data
)
4890 struct mddev
*mddev
= (struct mddev
*) data
;
4892 if (!atomic_read(&mddev
->writes_pending
)) {
4893 mddev
->safemode
= 1;
4894 if (mddev
->external
)
4895 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4897 md_wakeup_thread(mddev
->thread
);
4900 static int start_dirty_degraded
;
4902 int md_run(struct mddev
*mddev
)
4905 struct md_rdev
*rdev
;
4906 struct md_personality
*pers
;
4908 if (list_empty(&mddev
->disks
))
4909 /* cannot run an array with no devices.. */
4914 /* Cannot run until previous stop completes properly */
4915 if (mddev
->sysfs_active
)
4919 * Analyze all RAID superblock(s)
4921 if (!mddev
->raid_disks
) {
4922 if (!mddev
->persistent
)
4927 if (mddev
->level
!= LEVEL_NONE
)
4928 request_module("md-level-%d", mddev
->level
);
4929 else if (mddev
->clevel
[0])
4930 request_module("md-%s", mddev
->clevel
);
4933 * Drop all container device buffers, from now on
4934 * the only valid external interface is through the md
4937 rdev_for_each(rdev
, mddev
) {
4938 if (test_bit(Faulty
, &rdev
->flags
))
4940 sync_blockdev(rdev
->bdev
);
4941 invalidate_bdev(rdev
->bdev
);
4943 /* perform some consistency tests on the device.
4944 * We don't want the data to overlap the metadata,
4945 * Internal Bitmap issues have been handled elsewhere.
4947 if (rdev
->meta_bdev
) {
4948 /* Nothing to check */;
4949 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4950 if (mddev
->dev_sectors
&&
4951 rdev
->data_offset
+ mddev
->dev_sectors
4953 printk("md: %s: data overlaps metadata\n",
4958 if (rdev
->sb_start
+ rdev
->sb_size
/512
4959 > rdev
->data_offset
) {
4960 printk("md: %s: metadata overlaps data\n",
4965 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
4968 if (mddev
->bio_set
== NULL
)
4969 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
4971 spin_lock(&pers_lock
);
4972 pers
= find_pers(mddev
->level
, mddev
->clevel
);
4973 if (!pers
|| !try_module_get(pers
->owner
)) {
4974 spin_unlock(&pers_lock
);
4975 if (mddev
->level
!= LEVEL_NONE
)
4976 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
4979 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
4984 spin_unlock(&pers_lock
);
4985 if (mddev
->level
!= pers
->level
) {
4986 mddev
->level
= pers
->level
;
4987 mddev
->new_level
= pers
->level
;
4989 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
4991 if (mddev
->reshape_position
!= MaxSector
&&
4992 pers
->start_reshape
== NULL
) {
4993 /* This personality cannot handle reshaping... */
4995 module_put(pers
->owner
);
4999 if (pers
->sync_request
) {
5000 /* Warn if this is a potentially silly
5003 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5004 struct md_rdev
*rdev2
;
5007 rdev_for_each(rdev
, mddev
)
5008 rdev_for_each(rdev2
, mddev
) {
5010 rdev
->bdev
->bd_contains
==
5011 rdev2
->bdev
->bd_contains
) {
5013 "%s: WARNING: %s appears to be"
5014 " on the same physical disk as"
5017 bdevname(rdev
->bdev
,b
),
5018 bdevname(rdev2
->bdev
,b2
));
5025 "True protection against single-disk"
5026 " failure might be compromised.\n");
5029 mddev
->recovery
= 0;
5030 /* may be over-ridden by personality */
5031 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5033 mddev
->ok_start_degraded
= start_dirty_degraded
;
5035 if (start_readonly
&& mddev
->ro
== 0)
5036 mddev
->ro
= 2; /* read-only, but switch on first write */
5038 err
= mddev
->pers
->run(mddev
);
5040 printk(KERN_ERR
"md: pers->run() failed ...\n");
5041 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5042 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5043 " but 'external_size' not in effect?\n", __func__
);
5045 "md: invalid array_size %llu > default size %llu\n",
5046 (unsigned long long)mddev
->array_sectors
/ 2,
5047 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5049 mddev
->pers
->stop(mddev
);
5051 if (err
== 0 && mddev
->pers
->sync_request
&&
5052 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5053 err
= bitmap_create(mddev
);
5055 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5056 mdname(mddev
), err
);
5057 mddev
->pers
->stop(mddev
);
5061 module_put(mddev
->pers
->owner
);
5063 bitmap_destroy(mddev
);
5066 if (mddev
->pers
->sync_request
) {
5067 if (mddev
->kobj
.sd
&&
5068 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5070 "md: cannot register extra attributes for %s\n",
5072 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5073 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5076 atomic_set(&mddev
->writes_pending
,0);
5077 atomic_set(&mddev
->max_corr_read_errors
,
5078 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5079 mddev
->safemode
= 0;
5080 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5081 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5082 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5086 rdev_for_each(rdev
, mddev
)
5087 if (rdev
->raid_disk
>= 0)
5088 if (sysfs_link_rdev(mddev
, rdev
))
5089 /* failure here is OK */;
5091 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5093 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5094 md_update_sb(mddev
, 0);
5096 md_new_event(mddev
);
5097 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5098 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5099 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5102 EXPORT_SYMBOL_GPL(md_run
);
5104 static int do_md_run(struct mddev
*mddev
)
5108 err
= md_run(mddev
);
5111 err
= bitmap_load(mddev
);
5113 bitmap_destroy(mddev
);
5117 md_wakeup_thread(mddev
->thread
);
5118 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5120 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5121 revalidate_disk(mddev
->gendisk
);
5123 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5128 static int restart_array(struct mddev
*mddev
)
5130 struct gendisk
*disk
= mddev
->gendisk
;
5132 /* Complain if it has no devices */
5133 if (list_empty(&mddev
->disks
))
5139 mddev
->safemode
= 0;
5141 set_disk_ro(disk
, 0);
5142 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5144 /* Kick recovery or resync if necessary */
5145 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5146 md_wakeup_thread(mddev
->thread
);
5147 md_wakeup_thread(mddev
->sync_thread
);
5148 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5152 static void md_clean(struct mddev
*mddev
)
5154 mddev
->array_sectors
= 0;
5155 mddev
->external_size
= 0;
5156 mddev
->dev_sectors
= 0;
5157 mddev
->raid_disks
= 0;
5158 mddev
->recovery_cp
= 0;
5159 mddev
->resync_min
= 0;
5160 mddev
->resync_max
= MaxSector
;
5161 mddev
->reshape_position
= MaxSector
;
5162 mddev
->external
= 0;
5163 mddev
->persistent
= 0;
5164 mddev
->level
= LEVEL_NONE
;
5165 mddev
->clevel
[0] = 0;
5168 mddev
->metadata_type
[0] = 0;
5169 mddev
->chunk_sectors
= 0;
5170 mddev
->ctime
= mddev
->utime
= 0;
5172 mddev
->max_disks
= 0;
5174 mddev
->can_decrease_events
= 0;
5175 mddev
->delta_disks
= 0;
5176 mddev
->reshape_backwards
= 0;
5177 mddev
->new_level
= LEVEL_NONE
;
5178 mddev
->new_layout
= 0;
5179 mddev
->new_chunk_sectors
= 0;
5180 mddev
->curr_resync
= 0;
5181 atomic64_set(&mddev
->resync_mismatches
, 0);
5182 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5183 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5184 mddev
->recovery
= 0;
5187 mddev
->degraded
= 0;
5188 mddev
->safemode
= 0;
5189 mddev
->merge_check_needed
= 0;
5190 mddev
->bitmap_info
.offset
= 0;
5191 mddev
->bitmap_info
.default_offset
= 0;
5192 mddev
->bitmap_info
.default_space
= 0;
5193 mddev
->bitmap_info
.chunksize
= 0;
5194 mddev
->bitmap_info
.daemon_sleep
= 0;
5195 mddev
->bitmap_info
.max_write_behind
= 0;
5198 static void __md_stop_writes(struct mddev
*mddev
)
5200 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5201 if (mddev
->sync_thread
) {
5202 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5203 md_reap_sync_thread(mddev
);
5206 del_timer_sync(&mddev
->safemode_timer
);
5208 bitmap_flush(mddev
);
5209 md_super_wait(mddev
);
5211 if (mddev
->ro
== 0 &&
5212 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5213 /* mark array as shutdown cleanly */
5215 md_update_sb(mddev
, 1);
5219 void md_stop_writes(struct mddev
*mddev
)
5221 mddev_lock_nointr(mddev
);
5222 __md_stop_writes(mddev
);
5223 mddev_unlock(mddev
);
5225 EXPORT_SYMBOL_GPL(md_stop_writes
);
5227 static void __md_stop(struct mddev
*mddev
)
5230 mddev
->pers
->stop(mddev
);
5231 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5232 mddev
->to_remove
= &md_redundancy_group
;
5233 module_put(mddev
->pers
->owner
);
5235 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5238 void md_stop(struct mddev
*mddev
)
5240 /* stop the array and free an attached data structures.
5241 * This is called from dm-raid
5244 bitmap_destroy(mddev
);
5246 bioset_free(mddev
->bio_set
);
5249 EXPORT_SYMBOL_GPL(md_stop
);
5251 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5256 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5258 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5259 md_wakeup_thread(mddev
->thread
);
5261 if (mddev
->sync_thread
) {
5262 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5263 /* Thread might be blocked waiting for metadata update
5264 * which will now never happen */
5265 wake_up_process(mddev
->sync_thread
->tsk
);
5267 mddev_unlock(mddev
);
5268 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5269 mddev_lock_nointr(mddev
);
5271 mutex_lock(&mddev
->open_mutex
);
5272 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5273 mddev
->sync_thread
||
5274 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5275 printk("md: %s still in use.\n",mdname(mddev
));
5277 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5278 md_wakeup_thread(mddev
->thread
);
5284 __md_stop_writes(mddev
);
5290 set_disk_ro(mddev
->gendisk
, 1);
5291 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5292 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5296 mutex_unlock(&mddev
->open_mutex
);
5301 * 0 - completely stop and dis-assemble array
5302 * 2 - stop but do not disassemble array
5304 static int do_md_stop(struct mddev
*mddev
, int mode
,
5305 struct block_device
*bdev
)
5307 struct gendisk
*disk
= mddev
->gendisk
;
5308 struct md_rdev
*rdev
;
5311 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5313 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5314 md_wakeup_thread(mddev
->thread
);
5316 if (mddev
->sync_thread
) {
5317 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5318 /* Thread might be blocked waiting for metadata update
5319 * which will now never happen */
5320 wake_up_process(mddev
->sync_thread
->tsk
);
5322 mddev_unlock(mddev
);
5323 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5324 mddev_lock_nointr(mddev
);
5326 mutex_lock(&mddev
->open_mutex
);
5327 if ((mddev
->pers
&& atomic_read(&mddev
->openers
) > !!bdev
) ||
5328 mddev
->sysfs_active
||
5329 mddev
->sync_thread
||
5330 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5331 printk("md: %s still in use.\n",mdname(mddev
));
5332 mutex_unlock(&mddev
->open_mutex
);
5334 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5335 md_wakeup_thread(mddev
->thread
);
5341 set_disk_ro(disk
, 0);
5343 __md_stop_writes(mddev
);
5345 mddev
->queue
->merge_bvec_fn
= NULL
;
5346 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5348 /* tell userspace to handle 'inactive' */
5349 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5351 rdev_for_each(rdev
, mddev
)
5352 if (rdev
->raid_disk
>= 0)
5353 sysfs_unlink_rdev(mddev
, rdev
);
5355 set_capacity(disk
, 0);
5356 mutex_unlock(&mddev
->open_mutex
);
5358 revalidate_disk(disk
);
5363 mutex_unlock(&mddev
->open_mutex
);
5365 * Free resources if final stop
5368 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5370 bitmap_destroy(mddev
);
5371 if (mddev
->bitmap_info
.file
) {
5372 fput(mddev
->bitmap_info
.file
);
5373 mddev
->bitmap_info
.file
= NULL
;
5375 mddev
->bitmap_info
.offset
= 0;
5377 export_array(mddev
);
5380 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5381 if (mddev
->hold_active
== UNTIL_STOP
)
5382 mddev
->hold_active
= 0;
5384 blk_integrity_unregister(disk
);
5385 md_new_event(mddev
);
5386 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5391 static void autorun_array(struct mddev
*mddev
)
5393 struct md_rdev
*rdev
;
5396 if (list_empty(&mddev
->disks
))
5399 printk(KERN_INFO
"md: running: ");
5401 rdev_for_each(rdev
, mddev
) {
5402 char b
[BDEVNAME_SIZE
];
5403 printk("<%s>", bdevname(rdev
->bdev
,b
));
5407 err
= do_md_run(mddev
);
5409 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5410 do_md_stop(mddev
, 0, NULL
);
5415 * lets try to run arrays based on all disks that have arrived
5416 * until now. (those are in pending_raid_disks)
5418 * the method: pick the first pending disk, collect all disks with
5419 * the same UUID, remove all from the pending list and put them into
5420 * the 'same_array' list. Then order this list based on superblock
5421 * update time (freshest comes first), kick out 'old' disks and
5422 * compare superblocks. If everything's fine then run it.
5424 * If "unit" is allocated, then bump its reference count
5426 static void autorun_devices(int part
)
5428 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5429 struct mddev
*mddev
;
5430 char b
[BDEVNAME_SIZE
];
5432 printk(KERN_INFO
"md: autorun ...\n");
5433 while (!list_empty(&pending_raid_disks
)) {
5436 LIST_HEAD(candidates
);
5437 rdev0
= list_entry(pending_raid_disks
.next
,
5438 struct md_rdev
, same_set
);
5440 printk(KERN_INFO
"md: considering %s ...\n",
5441 bdevname(rdev0
->bdev
,b
));
5442 INIT_LIST_HEAD(&candidates
);
5443 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5444 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5445 printk(KERN_INFO
"md: adding %s ...\n",
5446 bdevname(rdev
->bdev
,b
));
5447 list_move(&rdev
->same_set
, &candidates
);
5450 * now we have a set of devices, with all of them having
5451 * mostly sane superblocks. It's time to allocate the
5455 dev
= MKDEV(mdp_major
,
5456 rdev0
->preferred_minor
<< MdpMinorShift
);
5457 unit
= MINOR(dev
) >> MdpMinorShift
;
5459 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5462 if (rdev0
->preferred_minor
!= unit
) {
5463 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5464 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5468 md_probe(dev
, NULL
, NULL
);
5469 mddev
= mddev_find(dev
);
5470 if (!mddev
|| !mddev
->gendisk
) {
5474 "md: cannot allocate memory for md drive.\n");
5477 if (mddev_lock(mddev
))
5478 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5480 else if (mddev
->raid_disks
|| mddev
->major_version
5481 || !list_empty(&mddev
->disks
)) {
5483 "md: %s already running, cannot run %s\n",
5484 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5485 mddev_unlock(mddev
);
5487 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5488 mddev
->persistent
= 1;
5489 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5490 list_del_init(&rdev
->same_set
);
5491 if (bind_rdev_to_array(rdev
, mddev
))
5494 autorun_array(mddev
);
5495 mddev_unlock(mddev
);
5497 /* on success, candidates will be empty, on error
5500 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5501 list_del_init(&rdev
->same_set
);
5506 printk(KERN_INFO
"md: ... autorun DONE.\n");
5508 #endif /* !MODULE */
5510 static int get_version(void __user
*arg
)
5514 ver
.major
= MD_MAJOR_VERSION
;
5515 ver
.minor
= MD_MINOR_VERSION
;
5516 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5518 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5524 static int get_array_info(struct mddev
*mddev
, void __user
*arg
)
5526 mdu_array_info_t info
;
5527 int nr
,working
,insync
,failed
,spare
;
5528 struct md_rdev
*rdev
;
5530 nr
= working
= insync
= failed
= spare
= 0;
5532 rdev_for_each_rcu(rdev
, mddev
) {
5534 if (test_bit(Faulty
, &rdev
->flags
))
5538 if (test_bit(In_sync
, &rdev
->flags
))
5546 info
.major_version
= mddev
->major_version
;
5547 info
.minor_version
= mddev
->minor_version
;
5548 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5549 info
.ctime
= mddev
->ctime
;
5550 info
.level
= mddev
->level
;
5551 info
.size
= mddev
->dev_sectors
/ 2;
5552 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5555 info
.raid_disks
= mddev
->raid_disks
;
5556 info
.md_minor
= mddev
->md_minor
;
5557 info
.not_persistent
= !mddev
->persistent
;
5559 info
.utime
= mddev
->utime
;
5562 info
.state
= (1<<MD_SB_CLEAN
);
5563 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5564 info
.state
|= (1<<MD_SB_BITMAP_PRESENT
);
5565 info
.active_disks
= insync
;
5566 info
.working_disks
= working
;
5567 info
.failed_disks
= failed
;
5568 info
.spare_disks
= spare
;
5570 info
.layout
= mddev
->layout
;
5571 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5573 if (copy_to_user(arg
, &info
, sizeof(info
)))
5579 static int get_bitmap_file(struct mddev
*mddev
, void __user
* arg
)
5581 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5582 char *ptr
, *buf
= NULL
;
5585 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5590 /* bitmap disabled, zero the first byte and copy out */
5591 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5592 file
->pathname
[0] = '\0';
5596 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5600 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5601 buf
, sizeof(file
->pathname
));
5605 strcpy(file
->pathname
, ptr
);
5609 if (copy_to_user(arg
, file
, sizeof(*file
)))
5617 static int get_disk_info(struct mddev
*mddev
, void __user
* arg
)
5619 mdu_disk_info_t info
;
5620 struct md_rdev
*rdev
;
5622 if (copy_from_user(&info
, arg
, sizeof(info
)))
5626 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5628 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5629 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5630 info
.raid_disk
= rdev
->raid_disk
;
5632 if (test_bit(Faulty
, &rdev
->flags
))
5633 info
.state
|= (1<<MD_DISK_FAULTY
);
5634 else if (test_bit(In_sync
, &rdev
->flags
)) {
5635 info
.state
|= (1<<MD_DISK_ACTIVE
);
5636 info
.state
|= (1<<MD_DISK_SYNC
);
5638 if (test_bit(WriteMostly
, &rdev
->flags
))
5639 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5641 info
.major
= info
.minor
= 0;
5642 info
.raid_disk
= -1;
5643 info
.state
= (1<<MD_DISK_REMOVED
);
5647 if (copy_to_user(arg
, &info
, sizeof(info
)))
5653 static int add_new_disk(struct mddev
*mddev
, mdu_disk_info_t
*info
)
5655 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5656 struct md_rdev
*rdev
;
5657 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5659 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5662 if (!mddev
->raid_disks
) {
5664 /* expecting a device which has a superblock */
5665 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5668 "md: md_import_device returned %ld\n",
5670 return PTR_ERR(rdev
);
5672 if (!list_empty(&mddev
->disks
)) {
5673 struct md_rdev
*rdev0
5674 = list_entry(mddev
->disks
.next
,
5675 struct md_rdev
, same_set
);
5676 err
= super_types
[mddev
->major_version
]
5677 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5680 "md: %s has different UUID to %s\n",
5681 bdevname(rdev
->bdev
,b
),
5682 bdevname(rdev0
->bdev
,b2
));
5687 err
= bind_rdev_to_array(rdev
, mddev
);
5694 * add_new_disk can be used once the array is assembled
5695 * to add "hot spares". They must already have a superblock
5700 if (!mddev
->pers
->hot_add_disk
) {
5702 "%s: personality does not support diskops!\n",
5706 if (mddev
->persistent
)
5707 rdev
= md_import_device(dev
, mddev
->major_version
,
5708 mddev
->minor_version
);
5710 rdev
= md_import_device(dev
, -1, -1);
5713 "md: md_import_device returned %ld\n",
5715 return PTR_ERR(rdev
);
5717 /* set saved_raid_disk if appropriate */
5718 if (!mddev
->persistent
) {
5719 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5720 info
->raid_disk
< mddev
->raid_disks
) {
5721 rdev
->raid_disk
= info
->raid_disk
;
5722 set_bit(In_sync
, &rdev
->flags
);
5723 clear_bit(Bitmap_sync
, &rdev
->flags
);
5725 rdev
->raid_disk
= -1;
5726 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5728 super_types
[mddev
->major_version
].
5729 validate_super(mddev
, rdev
);
5730 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5731 rdev
->raid_disk
!= info
->raid_disk
) {
5732 /* This was a hot-add request, but events doesn't
5733 * match, so reject it.
5739 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5740 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5741 set_bit(WriteMostly
, &rdev
->flags
);
5743 clear_bit(WriteMostly
, &rdev
->flags
);
5745 rdev
->raid_disk
= -1;
5746 err
= bind_rdev_to_array(rdev
, mddev
);
5747 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5748 /* If there is hot_add_disk but no hot_remove_disk
5749 * then added disks for geometry changes,
5750 * and should be added immediately.
5752 super_types
[mddev
->major_version
].
5753 validate_super(mddev
, rdev
);
5754 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5756 unbind_rdev_from_array(rdev
);
5761 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5763 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5764 if (mddev
->degraded
)
5765 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5766 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5768 md_new_event(mddev
);
5769 md_wakeup_thread(mddev
->thread
);
5773 /* otherwise, add_new_disk is only allowed
5774 * for major_version==0 superblocks
5776 if (mddev
->major_version
!= 0) {
5777 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5782 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5784 rdev
= md_import_device(dev
, -1, 0);
5787 "md: error, md_import_device() returned %ld\n",
5789 return PTR_ERR(rdev
);
5791 rdev
->desc_nr
= info
->number
;
5792 if (info
->raid_disk
< mddev
->raid_disks
)
5793 rdev
->raid_disk
= info
->raid_disk
;
5795 rdev
->raid_disk
= -1;
5797 if (rdev
->raid_disk
< mddev
->raid_disks
)
5798 if (info
->state
& (1<<MD_DISK_SYNC
))
5799 set_bit(In_sync
, &rdev
->flags
);
5801 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5802 set_bit(WriteMostly
, &rdev
->flags
);
5804 if (!mddev
->persistent
) {
5805 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5806 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5808 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5809 rdev
->sectors
= rdev
->sb_start
;
5811 err
= bind_rdev_to_array(rdev
, mddev
);
5821 static int hot_remove_disk(struct mddev
*mddev
, dev_t dev
)
5823 char b
[BDEVNAME_SIZE
];
5824 struct md_rdev
*rdev
;
5826 rdev
= find_rdev(mddev
, dev
);
5830 clear_bit(Blocked
, &rdev
->flags
);
5831 remove_and_add_spares(mddev
, rdev
);
5833 if (rdev
->raid_disk
>= 0)
5836 kick_rdev_from_array(rdev
);
5837 md_update_sb(mddev
, 1);
5838 md_new_event(mddev
);
5842 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5843 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5847 static int hot_add_disk(struct mddev
*mddev
, dev_t dev
)
5849 char b
[BDEVNAME_SIZE
];
5851 struct md_rdev
*rdev
;
5856 if (mddev
->major_version
!= 0) {
5857 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5858 " version-0 superblocks.\n",
5862 if (!mddev
->pers
->hot_add_disk
) {
5864 "%s: personality does not support diskops!\n",
5869 rdev
= md_import_device(dev
, -1, 0);
5872 "md: error, md_import_device() returned %ld\n",
5877 if (mddev
->persistent
)
5878 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5880 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5882 rdev
->sectors
= rdev
->sb_start
;
5884 if (test_bit(Faulty
, &rdev
->flags
)) {
5886 "md: can not hot-add faulty %s disk to %s!\n",
5887 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5891 clear_bit(In_sync
, &rdev
->flags
);
5893 rdev
->saved_raid_disk
= -1;
5894 err
= bind_rdev_to_array(rdev
, mddev
);
5899 * The rest should better be atomic, we can have disk failures
5900 * noticed in interrupt contexts ...
5903 rdev
->raid_disk
= -1;
5905 md_update_sb(mddev
, 1);
5908 * Kick recovery, maybe this spare has to be added to the
5909 * array immediately.
5911 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5912 md_wakeup_thread(mddev
->thread
);
5913 md_new_event(mddev
);
5921 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5926 if (!mddev
->pers
->quiesce
|| !mddev
->thread
)
5928 if (mddev
->recovery
|| mddev
->sync_thread
)
5930 /* we should be able to change the bitmap.. */
5934 struct inode
*inode
;
5936 return -EEXIST
; /* cannot add when bitmap is present */
5937 mddev
->bitmap_info
.file
= fget(fd
);
5939 if (mddev
->bitmap_info
.file
== NULL
) {
5940 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
5945 inode
= mddev
->bitmap_info
.file
->f_mapping
->host
;
5946 if (!S_ISREG(inode
->i_mode
)) {
5947 printk(KERN_ERR
"%s: error: bitmap file must be a regular file\n",
5950 } else if (!(mddev
->bitmap_info
.file
->f_mode
& FMODE_WRITE
)) {
5951 printk(KERN_ERR
"%s: error: bitmap file must open for write\n",
5954 } else if (atomic_read(&inode
->i_writecount
) != 1) {
5955 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
5960 fput(mddev
->bitmap_info
.file
);
5961 mddev
->bitmap_info
.file
= NULL
;
5964 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
5965 } else if (mddev
->bitmap
== NULL
)
5966 return -ENOENT
; /* cannot remove what isn't there */
5969 mddev
->pers
->quiesce(mddev
, 1);
5971 err
= bitmap_create(mddev
);
5973 err
= bitmap_load(mddev
);
5975 if (fd
< 0 || err
) {
5976 bitmap_destroy(mddev
);
5977 fd
= -1; /* make sure to put the file */
5979 mddev
->pers
->quiesce(mddev
, 0);
5982 if (mddev
->bitmap_info
.file
)
5983 fput(mddev
->bitmap_info
.file
);
5984 mddev
->bitmap_info
.file
= NULL
;
5991 * set_array_info is used two different ways
5992 * The original usage is when creating a new array.
5993 * In this usage, raid_disks is > 0 and it together with
5994 * level, size, not_persistent,layout,chunksize determine the
5995 * shape of the array.
5996 * This will always create an array with a type-0.90.0 superblock.
5997 * The newer usage is when assembling an array.
5998 * In this case raid_disks will be 0, and the major_version field is
5999 * use to determine which style super-blocks are to be found on the devices.
6000 * The minor and patch _version numbers are also kept incase the
6001 * super_block handler wishes to interpret them.
6003 static int set_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6006 if (info
->raid_disks
== 0) {
6007 /* just setting version number for superblock loading */
6008 if (info
->major_version
< 0 ||
6009 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6010 super_types
[info
->major_version
].name
== NULL
) {
6011 /* maybe try to auto-load a module? */
6013 "md: superblock version %d not known\n",
6014 info
->major_version
);
6017 mddev
->major_version
= info
->major_version
;
6018 mddev
->minor_version
= info
->minor_version
;
6019 mddev
->patch_version
= info
->patch_version
;
6020 mddev
->persistent
= !info
->not_persistent
;
6021 /* ensure mddev_put doesn't delete this now that there
6022 * is some minimal configuration.
6024 mddev
->ctime
= get_seconds();
6027 mddev
->major_version
= MD_MAJOR_VERSION
;
6028 mddev
->minor_version
= MD_MINOR_VERSION
;
6029 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6030 mddev
->ctime
= get_seconds();
6032 mddev
->level
= info
->level
;
6033 mddev
->clevel
[0] = 0;
6034 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6035 mddev
->raid_disks
= info
->raid_disks
;
6036 /* don't set md_minor, it is determined by which /dev/md* was
6039 if (info
->state
& (1<<MD_SB_CLEAN
))
6040 mddev
->recovery_cp
= MaxSector
;
6042 mddev
->recovery_cp
= 0;
6043 mddev
->persistent
= ! info
->not_persistent
;
6044 mddev
->external
= 0;
6046 mddev
->layout
= info
->layout
;
6047 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6049 mddev
->max_disks
= MD_SB_DISKS
;
6051 if (mddev
->persistent
)
6053 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6055 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6056 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6057 mddev
->bitmap_info
.offset
= 0;
6059 mddev
->reshape_position
= MaxSector
;
6062 * Generate a 128 bit UUID
6064 get_random_bytes(mddev
->uuid
, 16);
6066 mddev
->new_level
= mddev
->level
;
6067 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6068 mddev
->new_layout
= mddev
->layout
;
6069 mddev
->delta_disks
= 0;
6070 mddev
->reshape_backwards
= 0;
6075 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6077 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6079 if (mddev
->external_size
)
6082 mddev
->array_sectors
= array_sectors
;
6084 EXPORT_SYMBOL(md_set_array_sectors
);
6086 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6088 struct md_rdev
*rdev
;
6090 int fit
= (num_sectors
== 0);
6092 if (mddev
->pers
->resize
== NULL
)
6094 /* The "num_sectors" is the number of sectors of each device that
6095 * is used. This can only make sense for arrays with redundancy.
6096 * linear and raid0 always use whatever space is available. We can only
6097 * consider changing this number if no resync or reconstruction is
6098 * happening, and if the new size is acceptable. It must fit before the
6099 * sb_start or, if that is <data_offset, it must fit before the size
6100 * of each device. If num_sectors is zero, we find the largest size
6103 if (mddev
->sync_thread
)
6108 rdev_for_each(rdev
, mddev
) {
6109 sector_t avail
= rdev
->sectors
;
6111 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6112 num_sectors
= avail
;
6113 if (avail
< num_sectors
)
6116 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6118 revalidate_disk(mddev
->gendisk
);
6122 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6125 struct md_rdev
*rdev
;
6126 /* change the number of raid disks */
6127 if (mddev
->pers
->check_reshape
== NULL
)
6131 if (raid_disks
<= 0 ||
6132 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6134 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6137 rdev_for_each(rdev
, mddev
) {
6138 if (mddev
->raid_disks
< raid_disks
&&
6139 rdev
->data_offset
< rdev
->new_data_offset
)
6141 if (mddev
->raid_disks
> raid_disks
&&
6142 rdev
->data_offset
> rdev
->new_data_offset
)
6146 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6147 if (mddev
->delta_disks
< 0)
6148 mddev
->reshape_backwards
= 1;
6149 else if (mddev
->delta_disks
> 0)
6150 mddev
->reshape_backwards
= 0;
6152 rv
= mddev
->pers
->check_reshape(mddev
);
6154 mddev
->delta_disks
= 0;
6155 mddev
->reshape_backwards
= 0;
6161 * update_array_info is used to change the configuration of an
6163 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6164 * fields in the info are checked against the array.
6165 * Any differences that cannot be handled will cause an error.
6166 * Normally, only one change can be managed at a time.
6168 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6174 /* calculate expected state,ignoring low bits */
6175 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6176 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6178 if (mddev
->major_version
!= info
->major_version
||
6179 mddev
->minor_version
!= info
->minor_version
||
6180 /* mddev->patch_version != info->patch_version || */
6181 mddev
->ctime
!= info
->ctime
||
6182 mddev
->level
!= info
->level
||
6183 /* mddev->layout != info->layout || */
6184 !mddev
->persistent
!= info
->not_persistent
||
6185 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6186 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6187 ((state
^info
->state
) & 0xfffffe00)
6190 /* Check there is only one change */
6191 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6193 if (mddev
->raid_disks
!= info
->raid_disks
)
6195 if (mddev
->layout
!= info
->layout
)
6197 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6204 if (mddev
->layout
!= info
->layout
) {
6206 * we don't need to do anything at the md level, the
6207 * personality will take care of it all.
6209 if (mddev
->pers
->check_reshape
== NULL
)
6212 mddev
->new_layout
= info
->layout
;
6213 rv
= mddev
->pers
->check_reshape(mddev
);
6215 mddev
->new_layout
= mddev
->layout
;
6219 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6220 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6222 if (mddev
->raid_disks
!= info
->raid_disks
)
6223 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6225 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6226 if (mddev
->pers
->quiesce
== NULL
|| mddev
->thread
== NULL
)
6228 if (mddev
->recovery
|| mddev
->sync_thread
)
6230 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6231 /* add the bitmap */
6234 if (mddev
->bitmap_info
.default_offset
== 0)
6236 mddev
->bitmap_info
.offset
=
6237 mddev
->bitmap_info
.default_offset
;
6238 mddev
->bitmap_info
.space
=
6239 mddev
->bitmap_info
.default_space
;
6240 mddev
->pers
->quiesce(mddev
, 1);
6241 rv
= bitmap_create(mddev
);
6243 rv
= bitmap_load(mddev
);
6245 bitmap_destroy(mddev
);
6246 mddev
->pers
->quiesce(mddev
, 0);
6248 /* remove the bitmap */
6251 if (mddev
->bitmap
->storage
.file
)
6253 mddev
->pers
->quiesce(mddev
, 1);
6254 bitmap_destroy(mddev
);
6255 mddev
->pers
->quiesce(mddev
, 0);
6256 mddev
->bitmap_info
.offset
= 0;
6259 md_update_sb(mddev
, 1);
6263 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6265 struct md_rdev
*rdev
;
6268 if (mddev
->pers
== NULL
)
6272 rdev
= find_rdev_rcu(mddev
, dev
);
6276 md_error(mddev
, rdev
);
6277 if (!test_bit(Faulty
, &rdev
->flags
))
6285 * We have a problem here : there is no easy way to give a CHS
6286 * virtual geometry. We currently pretend that we have a 2 heads
6287 * 4 sectors (with a BIG number of cylinders...). This drives
6288 * dosfs just mad... ;-)
6290 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6292 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6296 geo
->cylinders
= mddev
->array_sectors
/ 8;
6300 static inline bool md_ioctl_valid(unsigned int cmd
)
6305 case GET_ARRAY_INFO
:
6306 case GET_BITMAP_FILE
:
6309 case HOT_REMOVE_DISK
:
6310 case PRINT_RAID_DEBUG
:
6313 case RESTART_ARRAY_RW
:
6315 case SET_ARRAY_INFO
:
6316 case SET_BITMAP_FILE
:
6317 case SET_DISK_FAULTY
:
6326 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6327 unsigned int cmd
, unsigned long arg
)
6330 void __user
*argp
= (void __user
*)arg
;
6331 struct mddev
*mddev
= NULL
;
6334 if (!md_ioctl_valid(cmd
))
6339 case GET_ARRAY_INFO
:
6343 if (!capable(CAP_SYS_ADMIN
))
6348 * Commands dealing with the RAID driver but not any
6353 err
= get_version(argp
);
6356 case PRINT_RAID_DEBUG
:
6364 autostart_arrays(arg
);
6371 * Commands creating/starting a new array:
6374 mddev
= bdev
->bd_disk
->private_data
;
6381 /* Some actions do not requires the mutex */
6383 case GET_ARRAY_INFO
:
6384 if (!mddev
->raid_disks
&& !mddev
->external
)
6387 err
= get_array_info(mddev
, argp
);
6391 if (!mddev
->raid_disks
&& !mddev
->external
)
6394 err
= get_disk_info(mddev
, argp
);
6397 case SET_DISK_FAULTY
:
6398 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6402 if (cmd
== ADD_NEW_DISK
)
6403 /* need to ensure md_delayed_delete() has completed */
6404 flush_workqueue(md_misc_wq
);
6406 if (cmd
== HOT_REMOVE_DISK
)
6407 /* need to ensure recovery thread has run */
6408 wait_event_interruptible_timeout(mddev
->sb_wait
,
6409 !test_bit(MD_RECOVERY_NEEDED
,
6411 msecs_to_jiffies(5000));
6412 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6413 /* Need to flush page cache, and ensure no-one else opens
6416 mutex_lock(&mddev
->open_mutex
);
6417 if (mddev
->pers
&& atomic_read(&mddev
->openers
) > 1) {
6418 mutex_unlock(&mddev
->open_mutex
);
6422 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6423 mutex_unlock(&mddev
->open_mutex
);
6424 sync_blockdev(bdev
);
6426 err
= mddev_lock(mddev
);
6429 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6434 if (cmd
== SET_ARRAY_INFO
) {
6435 mdu_array_info_t info
;
6437 memset(&info
, 0, sizeof(info
));
6438 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6443 err
= update_array_info(mddev
, &info
);
6445 printk(KERN_WARNING
"md: couldn't update"
6446 " array info. %d\n", err
);
6451 if (!list_empty(&mddev
->disks
)) {
6453 "md: array %s already has disks!\n",
6458 if (mddev
->raid_disks
) {
6460 "md: array %s already initialised!\n",
6465 err
= set_array_info(mddev
, &info
);
6467 printk(KERN_WARNING
"md: couldn't set"
6468 " array info. %d\n", err
);
6475 * Commands querying/configuring an existing array:
6477 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6478 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6479 if ((!mddev
->raid_disks
&& !mddev
->external
)
6480 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6481 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6482 && cmd
!= GET_BITMAP_FILE
) {
6488 * Commands even a read-only array can execute:
6491 case GET_BITMAP_FILE
:
6492 err
= get_bitmap_file(mddev
, argp
);
6495 case RESTART_ARRAY_RW
:
6496 err
= restart_array(mddev
);
6500 err
= do_md_stop(mddev
, 0, bdev
);
6504 err
= md_set_readonly(mddev
, bdev
);
6507 case HOT_REMOVE_DISK
:
6508 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6512 /* We can support ADD_NEW_DISK on read-only arrays
6513 * on if we are re-adding a preexisting device.
6514 * So require mddev->pers and MD_DISK_SYNC.
6517 mdu_disk_info_t info
;
6518 if (copy_from_user(&info
, argp
, sizeof(info
)))
6520 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6521 /* Need to clear read-only for this */
6524 err
= add_new_disk(mddev
, &info
);
6530 if (get_user(ro
, (int __user
*)(arg
))) {
6536 /* if the bdev is going readonly the value of mddev->ro
6537 * does not matter, no writes are coming
6542 /* are we are already prepared for writes? */
6546 /* transitioning to readauto need only happen for
6547 * arrays that call md_write_start
6550 err
= restart_array(mddev
);
6553 set_disk_ro(mddev
->gendisk
, 0);
6560 * The remaining ioctls are changing the state of the
6561 * superblock, so we do not allow them on read-only arrays.
6563 if (mddev
->ro
&& mddev
->pers
) {
6564 if (mddev
->ro
== 2) {
6566 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6567 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6568 /* mddev_unlock will wake thread */
6569 /* If a device failed while we were read-only, we
6570 * need to make sure the metadata is updated now.
6572 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6573 mddev_unlock(mddev
);
6574 wait_event(mddev
->sb_wait
,
6575 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6576 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6577 mddev_lock_nointr(mddev
);
6588 mdu_disk_info_t info
;
6589 if (copy_from_user(&info
, argp
, sizeof(info
)))
6592 err
= add_new_disk(mddev
, &info
);
6597 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6601 err
= do_md_run(mddev
);
6604 case SET_BITMAP_FILE
:
6605 err
= set_bitmap_file(mddev
, (int)arg
);
6615 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6617 mddev
->hold_active
= 0;
6618 mddev_unlock(mddev
);
6627 #ifdef CONFIG_COMPAT
6628 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6629 unsigned int cmd
, unsigned long arg
)
6632 case HOT_REMOVE_DISK
:
6634 case SET_DISK_FAULTY
:
6635 case SET_BITMAP_FILE
:
6636 /* These take in integer arg, do not convert */
6639 arg
= (unsigned long)compat_ptr(arg
);
6643 return md_ioctl(bdev
, mode
, cmd
, arg
);
6645 #endif /* CONFIG_COMPAT */
6647 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6650 * Succeed if we can lock the mddev, which confirms that
6651 * it isn't being stopped right now.
6653 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6659 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6660 /* we are racing with mddev_put which is discarding this
6664 /* Wait until bdev->bd_disk is definitely gone */
6665 flush_workqueue(md_misc_wq
);
6666 /* Then retry the open from the top */
6667 return -ERESTARTSYS
;
6669 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6671 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6675 atomic_inc(&mddev
->openers
);
6676 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6677 mutex_unlock(&mddev
->open_mutex
);
6679 check_disk_change(bdev
);
6684 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6686 struct mddev
*mddev
= disk
->private_data
;
6689 atomic_dec(&mddev
->openers
);
6693 static int md_media_changed(struct gendisk
*disk
)
6695 struct mddev
*mddev
= disk
->private_data
;
6697 return mddev
->changed
;
6700 static int md_revalidate(struct gendisk
*disk
)
6702 struct mddev
*mddev
= disk
->private_data
;
6707 static const struct block_device_operations md_fops
=
6709 .owner
= THIS_MODULE
,
6711 .release
= md_release
,
6713 #ifdef CONFIG_COMPAT
6714 .compat_ioctl
= md_compat_ioctl
,
6716 .getgeo
= md_getgeo
,
6717 .media_changed
= md_media_changed
,
6718 .revalidate_disk
= md_revalidate
,
6721 static int md_thread(void *arg
)
6723 struct md_thread
*thread
= arg
;
6726 * md_thread is a 'system-thread', it's priority should be very
6727 * high. We avoid resource deadlocks individually in each
6728 * raid personality. (RAID5 does preallocation) We also use RR and
6729 * the very same RT priority as kswapd, thus we will never get
6730 * into a priority inversion deadlock.
6732 * we definitely have to have equal or higher priority than
6733 * bdflush, otherwise bdflush will deadlock if there are too
6734 * many dirty RAID5 blocks.
6737 allow_signal(SIGKILL
);
6738 while (!kthread_should_stop()) {
6740 /* We need to wait INTERRUPTIBLE so that
6741 * we don't add to the load-average.
6742 * That means we need to be sure no signals are
6745 if (signal_pending(current
))
6746 flush_signals(current
);
6748 wait_event_interruptible_timeout
6750 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6751 || kthread_should_stop(),
6754 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6755 if (!kthread_should_stop())
6756 thread
->run(thread
);
6762 void md_wakeup_thread(struct md_thread
*thread
)
6765 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6766 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6767 wake_up(&thread
->wqueue
);
6771 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6772 struct mddev
*mddev
, const char *name
)
6774 struct md_thread
*thread
;
6776 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6780 init_waitqueue_head(&thread
->wqueue
);
6783 thread
->mddev
= mddev
;
6784 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6785 thread
->tsk
= kthread_run(md_thread
, thread
,
6787 mdname(thread
->mddev
),
6789 if (IS_ERR(thread
->tsk
)) {
6796 void md_unregister_thread(struct md_thread
**threadp
)
6798 struct md_thread
*thread
= *threadp
;
6801 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6802 /* Locking ensures that mddev_unlock does not wake_up a
6803 * non-existent thread
6805 spin_lock(&pers_lock
);
6807 spin_unlock(&pers_lock
);
6809 kthread_stop(thread
->tsk
);
6813 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6820 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6823 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6825 mddev
->pers
->error_handler(mddev
,rdev
);
6826 if (mddev
->degraded
)
6827 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6828 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6829 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6830 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6831 md_wakeup_thread(mddev
->thread
);
6832 if (mddev
->event_work
.func
)
6833 queue_work(md_misc_wq
, &mddev
->event_work
);
6834 md_new_event_inintr(mddev
);
6837 /* seq_file implementation /proc/mdstat */
6839 static void status_unused(struct seq_file
*seq
)
6842 struct md_rdev
*rdev
;
6844 seq_printf(seq
, "unused devices: ");
6846 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6847 char b
[BDEVNAME_SIZE
];
6849 seq_printf(seq
, "%s ",
6850 bdevname(rdev
->bdev
,b
));
6853 seq_printf(seq
, "<none>");
6855 seq_printf(seq
, "\n");
6858 static void status_resync(struct seq_file
*seq
, struct mddev
*mddev
)
6860 sector_t max_sectors
, resync
, res
;
6861 unsigned long dt
, db
;
6864 unsigned int per_milli
;
6866 if (mddev
->curr_resync
<= 3)
6869 resync
= mddev
->curr_resync
6870 - atomic_read(&mddev
->recovery_active
);
6872 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6873 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6874 max_sectors
= mddev
->resync_max_sectors
;
6876 max_sectors
= mddev
->dev_sectors
;
6879 * Should not happen.
6885 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6886 * in a sector_t, and (max_sectors>>scale) will fit in a
6887 * u32, as those are the requirements for sector_div.
6888 * Thus 'scale' must be at least 10
6891 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6892 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6895 res
= (resync
>>scale
)*1000;
6896 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6900 int i
, x
= per_milli
/50, y
= 20-x
;
6901 seq_printf(seq
, "[");
6902 for (i
= 0; i
< x
; i
++)
6903 seq_printf(seq
, "=");
6904 seq_printf(seq
, ">");
6905 for (i
= 0; i
< y
; i
++)
6906 seq_printf(seq
, ".");
6907 seq_printf(seq
, "] ");
6909 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6910 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6912 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6914 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6915 "resync" : "recovery"))),
6916 per_milli
/10, per_milli
% 10,
6917 (unsigned long long) resync
/2,
6918 (unsigned long long) max_sectors
/2);
6921 * dt: time from mark until now
6922 * db: blocks written from mark until now
6923 * rt: remaining time
6925 * rt is a sector_t, so could be 32bit or 64bit.
6926 * So we divide before multiply in case it is 32bit and close
6928 * We scale the divisor (db) by 32 to avoid losing precision
6929 * near the end of resync when the number of remaining sectors
6931 * We then divide rt by 32 after multiplying by db to compensate.
6932 * The '+1' avoids division by zero if db is very small.
6934 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6936 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6937 - mddev
->resync_mark_cnt
;
6939 rt
= max_sectors
- resync
; /* number of remaining sectors */
6940 sector_div(rt
, db
/32+1);
6944 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6945 ((unsigned long)rt
% 60)/6);
6947 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
6950 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
6952 struct list_head
*tmp
;
6954 struct mddev
*mddev
;
6962 spin_lock(&all_mddevs_lock
);
6963 list_for_each(tmp
,&all_mddevs
)
6965 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
6967 spin_unlock(&all_mddevs_lock
);
6970 spin_unlock(&all_mddevs_lock
);
6972 return (void*)2;/* tail */
6976 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
6978 struct list_head
*tmp
;
6979 struct mddev
*next_mddev
, *mddev
= v
;
6985 spin_lock(&all_mddevs_lock
);
6987 tmp
= all_mddevs
.next
;
6989 tmp
= mddev
->all_mddevs
.next
;
6990 if (tmp
!= &all_mddevs
)
6991 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
6993 next_mddev
= (void*)2;
6996 spin_unlock(&all_mddevs_lock
);
7004 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7006 struct mddev
*mddev
= v
;
7008 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7012 static int md_seq_show(struct seq_file
*seq
, void *v
)
7014 struct mddev
*mddev
= v
;
7016 struct md_rdev
*rdev
;
7018 if (v
== (void*)1) {
7019 struct md_personality
*pers
;
7020 seq_printf(seq
, "Personalities : ");
7021 spin_lock(&pers_lock
);
7022 list_for_each_entry(pers
, &pers_list
, list
)
7023 seq_printf(seq
, "[%s] ", pers
->name
);
7025 spin_unlock(&pers_lock
);
7026 seq_printf(seq
, "\n");
7027 seq
->poll_event
= atomic_read(&md_event_count
);
7030 if (v
== (void*)2) {
7035 if (mddev_lock(mddev
) < 0)
7038 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7039 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7040 mddev
->pers
? "" : "in");
7043 seq_printf(seq
, " (read-only)");
7045 seq_printf(seq
, " (auto-read-only)");
7046 seq_printf(seq
, " %s", mddev
->pers
->name
);
7050 rdev_for_each(rdev
, mddev
) {
7051 char b
[BDEVNAME_SIZE
];
7052 seq_printf(seq
, " %s[%d]",
7053 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7054 if (test_bit(WriteMostly
, &rdev
->flags
))
7055 seq_printf(seq
, "(W)");
7056 if (test_bit(Faulty
, &rdev
->flags
)) {
7057 seq_printf(seq
, "(F)");
7060 if (rdev
->raid_disk
< 0)
7061 seq_printf(seq
, "(S)"); /* spare */
7062 if (test_bit(Replacement
, &rdev
->flags
))
7063 seq_printf(seq
, "(R)");
7064 sectors
+= rdev
->sectors
;
7067 if (!list_empty(&mddev
->disks
)) {
7069 seq_printf(seq
, "\n %llu blocks",
7070 (unsigned long long)
7071 mddev
->array_sectors
/ 2);
7073 seq_printf(seq
, "\n %llu blocks",
7074 (unsigned long long)sectors
/ 2);
7076 if (mddev
->persistent
) {
7077 if (mddev
->major_version
!= 0 ||
7078 mddev
->minor_version
!= 90) {
7079 seq_printf(seq
," super %d.%d",
7080 mddev
->major_version
,
7081 mddev
->minor_version
);
7083 } else if (mddev
->external
)
7084 seq_printf(seq
, " super external:%s",
7085 mddev
->metadata_type
);
7087 seq_printf(seq
, " super non-persistent");
7090 mddev
->pers
->status(seq
, mddev
);
7091 seq_printf(seq
, "\n ");
7092 if (mddev
->pers
->sync_request
) {
7093 if (mddev
->curr_resync
> 2) {
7094 status_resync(seq
, mddev
);
7095 seq_printf(seq
, "\n ");
7096 } else if (mddev
->curr_resync
>= 1)
7097 seq_printf(seq
, "\tresync=DELAYED\n ");
7098 else if (mddev
->recovery_cp
< MaxSector
)
7099 seq_printf(seq
, "\tresync=PENDING\n ");
7102 seq_printf(seq
, "\n ");
7104 bitmap_status(seq
, mddev
->bitmap
);
7106 seq_printf(seq
, "\n");
7108 mddev_unlock(mddev
);
7113 static const struct seq_operations md_seq_ops
= {
7114 .start
= md_seq_start
,
7115 .next
= md_seq_next
,
7116 .stop
= md_seq_stop
,
7117 .show
= md_seq_show
,
7120 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7122 struct seq_file
*seq
;
7125 error
= seq_open(file
, &md_seq_ops
);
7129 seq
= file
->private_data
;
7130 seq
->poll_event
= atomic_read(&md_event_count
);
7134 static int md_unloading
;
7135 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7137 struct seq_file
*seq
= filp
->private_data
;
7141 return POLLIN
|POLLRDNORM
|POLLERR
|POLLPRI
;;
7142 poll_wait(filp
, &md_event_waiters
, wait
);
7144 /* always allow read */
7145 mask
= POLLIN
| POLLRDNORM
;
7147 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7148 mask
|= POLLERR
| POLLPRI
;
7152 static const struct file_operations md_seq_fops
= {
7153 .owner
= THIS_MODULE
,
7154 .open
= md_seq_open
,
7156 .llseek
= seq_lseek
,
7157 .release
= seq_release_private
,
7158 .poll
= mdstat_poll
,
7161 int register_md_personality(struct md_personality
*p
)
7163 printk(KERN_INFO
"md: %s personality registered for level %d\n",
7165 spin_lock(&pers_lock
);
7166 list_add_tail(&p
->list
, &pers_list
);
7167 spin_unlock(&pers_lock
);
7171 int unregister_md_personality(struct md_personality
*p
)
7173 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7174 spin_lock(&pers_lock
);
7175 list_del_init(&p
->list
);
7176 spin_unlock(&pers_lock
);
7180 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7182 struct md_rdev
*rdev
;
7188 rdev_for_each_rcu(rdev
, mddev
) {
7189 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7190 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7191 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7192 atomic_read(&disk
->sync_io
);
7193 /* sync IO will cause sync_io to increase before the disk_stats
7194 * as sync_io is counted when a request starts, and
7195 * disk_stats is counted when it completes.
7196 * So resync activity will cause curr_events to be smaller than
7197 * when there was no such activity.
7198 * non-sync IO will cause disk_stat to increase without
7199 * increasing sync_io so curr_events will (eventually)
7200 * be larger than it was before. Once it becomes
7201 * substantially larger, the test below will cause
7202 * the array to appear non-idle, and resync will slow
7204 * If there is a lot of outstanding resync activity when
7205 * we set last_event to curr_events, then all that activity
7206 * completing might cause the array to appear non-idle
7207 * and resync will be slowed down even though there might
7208 * not have been non-resync activity. This will only
7209 * happen once though. 'last_events' will soon reflect
7210 * the state where there is little or no outstanding
7211 * resync requests, and further resync activity will
7212 * always make curr_events less than last_events.
7215 if (init
|| curr_events
- rdev
->last_events
> 64) {
7216 rdev
->last_events
= curr_events
;
7224 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7226 /* another "blocks" (512byte) blocks have been synced */
7227 atomic_sub(blocks
, &mddev
->recovery_active
);
7228 wake_up(&mddev
->recovery_wait
);
7230 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7231 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7232 md_wakeup_thread(mddev
->thread
);
7233 // stop recovery, signal do_sync ....
7237 /* md_write_start(mddev, bi)
7238 * If we need to update some array metadata (e.g. 'active' flag
7239 * in superblock) before writing, schedule a superblock update
7240 * and wait for it to complete.
7242 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7245 if (bio_data_dir(bi
) != WRITE
)
7248 BUG_ON(mddev
->ro
== 1);
7249 if (mddev
->ro
== 2) {
7250 /* need to switch to read/write */
7252 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7253 md_wakeup_thread(mddev
->thread
);
7254 md_wakeup_thread(mddev
->sync_thread
);
7257 atomic_inc(&mddev
->writes_pending
);
7258 if (mddev
->safemode
== 1)
7259 mddev
->safemode
= 0;
7260 if (mddev
->in_sync
) {
7261 spin_lock_irq(&mddev
->write_lock
);
7262 if (mddev
->in_sync
) {
7264 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7265 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7266 md_wakeup_thread(mddev
->thread
);
7269 spin_unlock_irq(&mddev
->write_lock
);
7272 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7273 wait_event(mddev
->sb_wait
,
7274 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7277 void md_write_end(struct mddev
*mddev
)
7279 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7280 if (mddev
->safemode
== 2)
7281 md_wakeup_thread(mddev
->thread
);
7282 else if (mddev
->safemode_delay
)
7283 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7287 /* md_allow_write(mddev)
7288 * Calling this ensures that the array is marked 'active' so that writes
7289 * may proceed without blocking. It is important to call this before
7290 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7291 * Must be called with mddev_lock held.
7293 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7294 * is dropped, so return -EAGAIN after notifying userspace.
7296 int md_allow_write(struct mddev
*mddev
)
7302 if (!mddev
->pers
->sync_request
)
7305 spin_lock_irq(&mddev
->write_lock
);
7306 if (mddev
->in_sync
) {
7308 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7309 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7310 if (mddev
->safemode_delay
&&
7311 mddev
->safemode
== 0)
7312 mddev
->safemode
= 1;
7313 spin_unlock_irq(&mddev
->write_lock
);
7314 md_update_sb(mddev
, 0);
7315 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7317 spin_unlock_irq(&mddev
->write_lock
);
7319 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7324 EXPORT_SYMBOL_GPL(md_allow_write
);
7326 #define SYNC_MARKS 10
7327 #define SYNC_MARK_STEP (3*HZ)
7328 #define UPDATE_FREQUENCY (5*60*HZ)
7329 void md_do_sync(struct md_thread
*thread
)
7331 struct mddev
*mddev
= thread
->mddev
;
7332 struct mddev
*mddev2
;
7333 unsigned int currspeed
= 0,
7335 sector_t max_sectors
,j
, io_sectors
, recovery_done
;
7336 unsigned long mark
[SYNC_MARKS
];
7337 unsigned long update_time
;
7338 sector_t mark_cnt
[SYNC_MARKS
];
7340 struct list_head
*tmp
;
7341 sector_t last_check
;
7343 struct md_rdev
*rdev
;
7344 char *desc
, *action
= NULL
;
7345 struct blk_plug plug
;
7347 /* just incase thread restarts... */
7348 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7350 if (mddev
->ro
) {/* never try to sync a read-only array */
7351 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7355 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7356 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7357 desc
= "data-check";
7359 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7360 desc
= "requested-resync";
7364 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7369 mddev
->last_sync_action
= action
?: desc
;
7371 /* we overload curr_resync somewhat here.
7372 * 0 == not engaged in resync at all
7373 * 2 == checking that there is no conflict with another sync
7374 * 1 == like 2, but have yielded to allow conflicting resync to
7376 * other == active in resync - this many blocks
7378 * Before starting a resync we must have set curr_resync to
7379 * 2, and then checked that every "conflicting" array has curr_resync
7380 * less than ours. When we find one that is the same or higher
7381 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7382 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7383 * This will mean we have to start checking from the beginning again.
7388 mddev
->curr_resync
= 2;
7391 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7393 for_each_mddev(mddev2
, tmp
) {
7394 if (mddev2
== mddev
)
7396 if (!mddev
->parallel_resync
7397 && mddev2
->curr_resync
7398 && match_mddev_units(mddev
, mddev2
)) {
7400 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7401 /* arbitrarily yield */
7402 mddev
->curr_resync
= 1;
7403 wake_up(&resync_wait
);
7405 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7406 /* no need to wait here, we can wait the next
7407 * time 'round when curr_resync == 2
7410 /* We need to wait 'interruptible' so as not to
7411 * contribute to the load average, and not to
7412 * be caught by 'softlockup'
7414 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7415 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7416 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7417 printk(KERN_INFO
"md: delaying %s of %s"
7418 " until %s has finished (they"
7419 " share one or more physical units)\n",
7420 desc
, mdname(mddev
), mdname(mddev2
));
7422 if (signal_pending(current
))
7423 flush_signals(current
);
7425 finish_wait(&resync_wait
, &wq
);
7428 finish_wait(&resync_wait
, &wq
);
7431 } while (mddev
->curr_resync
< 2);
7434 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7435 /* resync follows the size requested by the personality,
7436 * which defaults to physical size, but can be virtual size
7438 max_sectors
= mddev
->resync_max_sectors
;
7439 atomic64_set(&mddev
->resync_mismatches
, 0);
7440 /* we don't use the checkpoint if there's a bitmap */
7441 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7442 j
= mddev
->resync_min
;
7443 else if (!mddev
->bitmap
)
7444 j
= mddev
->recovery_cp
;
7446 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7447 max_sectors
= mddev
->resync_max_sectors
;
7449 /* recovery follows the physical size of devices */
7450 max_sectors
= mddev
->dev_sectors
;
7453 rdev_for_each_rcu(rdev
, mddev
)
7454 if (rdev
->raid_disk
>= 0 &&
7455 !test_bit(Faulty
, &rdev
->flags
) &&
7456 !test_bit(In_sync
, &rdev
->flags
) &&
7457 rdev
->recovery_offset
< j
)
7458 j
= rdev
->recovery_offset
;
7461 /* If there is a bitmap, we need to make sure all
7462 * writes that started before we added a spare
7463 * complete before we start doing a recovery.
7464 * Otherwise the write might complete and (via
7465 * bitmap_endwrite) set a bit in the bitmap after the
7466 * recovery has checked that bit and skipped that
7469 if (mddev
->bitmap
) {
7470 mddev
->pers
->quiesce(mddev
, 1);
7471 mddev
->pers
->quiesce(mddev
, 0);
7475 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7476 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7477 " %d KB/sec/disk.\n", speed_min(mddev
));
7478 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7479 "(but not more than %d KB/sec) for %s.\n",
7480 speed_max(mddev
), desc
);
7482 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7485 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7487 mark_cnt
[m
] = io_sectors
;
7490 mddev
->resync_mark
= mark
[last_mark
];
7491 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7494 * Tune reconstruction:
7496 window
= 32*(PAGE_SIZE
/512);
7497 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7498 window
/2, (unsigned long long)max_sectors
/2);
7500 atomic_set(&mddev
->recovery_active
, 0);
7505 "md: resuming %s of %s from checkpoint.\n",
7506 desc
, mdname(mddev
));
7507 mddev
->curr_resync
= j
;
7509 mddev
->curr_resync
= 3; /* no longer delayed */
7510 mddev
->curr_resync_completed
= j
;
7511 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7512 md_new_event(mddev
);
7513 update_time
= jiffies
;
7515 blk_start_plug(&plug
);
7516 while (j
< max_sectors
) {
7521 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7522 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7523 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7524 > (max_sectors
>> 4)) ||
7525 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7526 (j
- mddev
->curr_resync_completed
)*2
7527 >= mddev
->resync_max
- mddev
->curr_resync_completed
7529 /* time to update curr_resync_completed */
7530 wait_event(mddev
->recovery_wait
,
7531 atomic_read(&mddev
->recovery_active
) == 0);
7532 mddev
->curr_resync_completed
= j
;
7533 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7534 j
> mddev
->recovery_cp
)
7535 mddev
->recovery_cp
= j
;
7536 update_time
= jiffies
;
7537 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7538 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7541 while (j
>= mddev
->resync_max
&&
7542 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7543 /* As this condition is controlled by user-space,
7544 * we can block indefinitely, so use '_interruptible'
7545 * to avoid triggering warnings.
7547 flush_signals(current
); /* just in case */
7548 wait_event_interruptible(mddev
->recovery_wait
,
7549 mddev
->resync_max
> j
7550 || test_bit(MD_RECOVERY_INTR
,
7554 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7557 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7558 currspeed
< speed_min(mddev
));
7560 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7564 if (!skipped
) { /* actual IO requested */
7565 io_sectors
+= sectors
;
7566 atomic_add(sectors
, &mddev
->recovery_active
);
7569 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7574 mddev
->curr_resync
= j
;
7575 mddev
->curr_mark_cnt
= io_sectors
;
7576 if (last_check
== 0)
7577 /* this is the earliest that rebuild will be
7578 * visible in /proc/mdstat
7580 md_new_event(mddev
);
7582 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7585 last_check
= io_sectors
;
7587 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7589 int next
= (last_mark
+1) % SYNC_MARKS
;
7591 mddev
->resync_mark
= mark
[next
];
7592 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7593 mark
[next
] = jiffies
;
7594 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7598 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7602 * this loop exits only if either when we are slower than
7603 * the 'hard' speed limit, or the system was IO-idle for
7605 * the system might be non-idle CPU-wise, but we only care
7606 * about not overloading the IO subsystem. (things like an
7607 * e2fsck being done on the RAID array should execute fast)
7611 recovery_done
= io_sectors
- atomic_read(&mddev
->recovery_active
);
7612 currspeed
= ((unsigned long)(recovery_done
- mddev
->resync_mark_cnt
))/2
7613 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7615 if (currspeed
> speed_min(mddev
)) {
7616 if ((currspeed
> speed_max(mddev
)) ||
7617 !is_mddev_idle(mddev
, 0)) {
7623 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7624 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7625 ? "interrupted" : "done");
7627 * this also signals 'finished resyncing' to md_stop
7629 blk_finish_plug(&plug
);
7630 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7632 /* tell personality that we are finished */
7633 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7635 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7636 mddev
->curr_resync
> 2) {
7637 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7638 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7639 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7641 "md: checkpointing %s of %s.\n",
7642 desc
, mdname(mddev
));
7643 if (test_bit(MD_RECOVERY_ERROR
,
7645 mddev
->recovery_cp
=
7646 mddev
->curr_resync_completed
;
7648 mddev
->recovery_cp
=
7652 mddev
->recovery_cp
= MaxSector
;
7654 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7655 mddev
->curr_resync
= MaxSector
;
7657 rdev_for_each_rcu(rdev
, mddev
)
7658 if (rdev
->raid_disk
>= 0 &&
7659 mddev
->delta_disks
>= 0 &&
7660 !test_bit(Faulty
, &rdev
->flags
) &&
7661 !test_bit(In_sync
, &rdev
->flags
) &&
7662 rdev
->recovery_offset
< mddev
->curr_resync
)
7663 rdev
->recovery_offset
= mddev
->curr_resync
;
7668 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7670 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7671 /* We completed so min/max setting can be forgotten if used. */
7672 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7673 mddev
->resync_min
= 0;
7674 mddev
->resync_max
= MaxSector
;
7675 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7676 mddev
->resync_min
= mddev
->curr_resync_completed
;
7677 mddev
->curr_resync
= 0;
7678 wake_up(&resync_wait
);
7679 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7680 md_wakeup_thread(mddev
->thread
);
7683 EXPORT_SYMBOL_GPL(md_do_sync
);
7685 static int remove_and_add_spares(struct mddev
*mddev
,
7686 struct md_rdev
*this)
7688 struct md_rdev
*rdev
;
7692 rdev_for_each(rdev
, mddev
)
7693 if ((this == NULL
|| rdev
== this) &&
7694 rdev
->raid_disk
>= 0 &&
7695 !test_bit(Blocked
, &rdev
->flags
) &&
7696 (test_bit(Faulty
, &rdev
->flags
) ||
7697 ! test_bit(In_sync
, &rdev
->flags
)) &&
7698 atomic_read(&rdev
->nr_pending
)==0) {
7699 if (mddev
->pers
->hot_remove_disk(
7700 mddev
, rdev
) == 0) {
7701 sysfs_unlink_rdev(mddev
, rdev
);
7702 rdev
->raid_disk
= -1;
7706 if (removed
&& mddev
->kobj
.sd
)
7707 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7712 rdev_for_each(rdev
, mddev
) {
7713 if (rdev
->raid_disk
>= 0 &&
7714 !test_bit(In_sync
, &rdev
->flags
) &&
7715 !test_bit(Faulty
, &rdev
->flags
))
7717 if (rdev
->raid_disk
>= 0)
7719 if (test_bit(Faulty
, &rdev
->flags
))
7722 ! (rdev
->saved_raid_disk
>= 0 &&
7723 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7726 if (rdev
->saved_raid_disk
< 0)
7727 rdev
->recovery_offset
= 0;
7729 hot_add_disk(mddev
, rdev
) == 0) {
7730 if (sysfs_link_rdev(mddev
, rdev
))
7731 /* failure here is OK */;
7733 md_new_event(mddev
);
7734 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7739 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7743 static void md_start_sync(struct work_struct
*ws
)
7745 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
7747 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7750 if (!mddev
->sync_thread
) {
7751 printk(KERN_ERR
"%s: could not start resync"
7754 /* leave the spares where they are, it shouldn't hurt */
7755 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7756 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7757 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7758 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7759 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7760 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7762 if (mddev
->sysfs_action
)
7763 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7765 md_wakeup_thread(mddev
->sync_thread
);
7766 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7767 md_new_event(mddev
);
7771 * This routine is regularly called by all per-raid-array threads to
7772 * deal with generic issues like resync and super-block update.
7773 * Raid personalities that don't have a thread (linear/raid0) do not
7774 * need this as they never do any recovery or update the superblock.
7776 * It does not do any resync itself, but rather "forks" off other threads
7777 * to do that as needed.
7778 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7779 * "->recovery" and create a thread at ->sync_thread.
7780 * When the thread finishes it sets MD_RECOVERY_DONE
7781 * and wakeups up this thread which will reap the thread and finish up.
7782 * This thread also removes any faulty devices (with nr_pending == 0).
7784 * The overall approach is:
7785 * 1/ if the superblock needs updating, update it.
7786 * 2/ If a recovery thread is running, don't do anything else.
7787 * 3/ If recovery has finished, clean up, possibly marking spares active.
7788 * 4/ If there are any faulty devices, remove them.
7789 * 5/ If array is degraded, try to add spares devices
7790 * 6/ If array has spares or is not in-sync, start a resync thread.
7792 void md_check_recovery(struct mddev
*mddev
)
7794 if (mddev
->suspended
)
7798 bitmap_daemon_work(mddev
);
7800 if (signal_pending(current
)) {
7801 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7802 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7804 mddev
->safemode
= 2;
7806 flush_signals(current
);
7809 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7812 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
7813 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7814 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7815 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7816 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7817 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7821 if (mddev_trylock(mddev
)) {
7825 /* On a read-only array we can:
7826 * - remove failed devices
7827 * - add already-in_sync devices if the array itself
7829 * As we only add devices that are already in-sync,
7830 * we can activate the spares immediately.
7832 remove_and_add_spares(mddev
, NULL
);
7833 /* There is no thread, but we need to call
7834 * ->spare_active and clear saved_raid_disk
7836 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7837 md_reap_sync_thread(mddev
);
7838 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7842 if (!mddev
->external
) {
7844 spin_lock_irq(&mddev
->write_lock
);
7845 if (mddev
->safemode
&&
7846 !atomic_read(&mddev
->writes_pending
) &&
7848 mddev
->recovery_cp
== MaxSector
) {
7851 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7853 if (mddev
->safemode
== 1)
7854 mddev
->safemode
= 0;
7855 spin_unlock_irq(&mddev
->write_lock
);
7857 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7860 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7861 md_update_sb(mddev
, 0);
7863 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7864 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7865 /* resync/recovery still happening */
7866 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7869 if (mddev
->sync_thread
) {
7870 md_reap_sync_thread(mddev
);
7873 /* Set RUNNING before clearing NEEDED to avoid
7874 * any transients in the value of "sync_action".
7876 mddev
->curr_resync_completed
= 0;
7877 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7878 /* Clear some bits that don't mean anything, but
7881 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7882 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7884 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7885 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7887 /* no recovery is running.
7888 * remove any failed drives, then
7889 * add spares if possible.
7890 * Spares are also removed and re-added, to allow
7891 * the personality to fail the re-add.
7894 if (mddev
->reshape_position
!= MaxSector
) {
7895 if (mddev
->pers
->check_reshape
== NULL
||
7896 mddev
->pers
->check_reshape(mddev
) != 0)
7897 /* Cannot proceed */
7899 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7900 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7901 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7902 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7903 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7904 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7905 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7906 } else if (mddev
->recovery_cp
< MaxSector
) {
7907 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7908 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7909 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7910 /* nothing to be done ... */
7913 if (mddev
->pers
->sync_request
) {
7915 /* We are adding a device or devices to an array
7916 * which has the bitmap stored on all devices.
7917 * So make sure all bitmap pages get written
7919 bitmap_write_all(mddev
->bitmap
);
7921 INIT_WORK(&mddev
->del_work
, md_start_sync
);
7922 queue_work(md_misc_wq
, &mddev
->del_work
);
7926 if (!mddev
->sync_thread
) {
7927 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7928 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7930 if (mddev
->sysfs_action
)
7931 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7934 wake_up(&mddev
->sb_wait
);
7935 mddev_unlock(mddev
);
7939 void md_reap_sync_thread(struct mddev
*mddev
)
7941 struct md_rdev
*rdev
;
7943 /* resync has finished, collect result */
7944 md_unregister_thread(&mddev
->sync_thread
);
7945 wake_up(&resync_wait
);
7946 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7947 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7949 /* activate any spares */
7950 if (mddev
->pers
->spare_active(mddev
)) {
7951 sysfs_notify(&mddev
->kobj
, NULL
,
7953 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7956 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7957 mddev
->pers
->finish_reshape
)
7958 mddev
->pers
->finish_reshape(mddev
);
7960 /* If array is no-longer degraded, then any saved_raid_disk
7961 * information must be scrapped.
7963 if (!mddev
->degraded
)
7964 rdev_for_each(rdev
, mddev
)
7965 rdev
->saved_raid_disk
= -1;
7967 md_update_sb(mddev
, 1);
7968 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7969 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7970 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7971 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7972 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7973 /* flag recovery needed just to double check */
7974 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7975 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7976 md_new_event(mddev
);
7977 if (mddev
->event_work
.func
)
7978 queue_work(md_misc_wq
, &mddev
->event_work
);
7981 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
7983 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
7984 wait_event_timeout(rdev
->blocked_wait
,
7985 !test_bit(Blocked
, &rdev
->flags
) &&
7986 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
7987 msecs_to_jiffies(5000));
7988 rdev_dec_pending(rdev
, mddev
);
7990 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
7992 void md_finish_reshape(struct mddev
*mddev
)
7994 /* called be personality module when reshape completes. */
7995 struct md_rdev
*rdev
;
7997 rdev_for_each(rdev
, mddev
) {
7998 if (rdev
->data_offset
> rdev
->new_data_offset
)
7999 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8001 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8002 rdev
->data_offset
= rdev
->new_data_offset
;
8005 EXPORT_SYMBOL(md_finish_reshape
);
8007 /* Bad block management.
8008 * We can record which blocks on each device are 'bad' and so just
8009 * fail those blocks, or that stripe, rather than the whole device.
8010 * Entries in the bad-block table are 64bits wide. This comprises:
8011 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8012 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8013 * A 'shift' can be set so that larger blocks are tracked and
8014 * consequently larger devices can be covered.
8015 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8017 * Locking of the bad-block table uses a seqlock so md_is_badblock
8018 * might need to retry if it is very unlucky.
8019 * We will sometimes want to check for bad blocks in a bi_end_io function,
8020 * so we use the write_seqlock_irq variant.
8022 * When looking for a bad block we specify a range and want to
8023 * know if any block in the range is bad. So we binary-search
8024 * to the last range that starts at-or-before the given endpoint,
8025 * (or "before the sector after the target range")
8026 * then see if it ends after the given start.
8028 * 0 if there are no known bad blocks in the range
8029 * 1 if there are known bad block which are all acknowledged
8030 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8031 * plus the start/length of the first bad section we overlap.
8033 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8034 sector_t
*first_bad
, int *bad_sectors
)
8040 sector_t target
= s
+ sectors
;
8043 if (bb
->shift
> 0) {
8044 /* round the start down, and the end up */
8046 target
+= (1<<bb
->shift
) - 1;
8047 target
>>= bb
->shift
;
8048 sectors
= target
- s
;
8050 /* 'target' is now the first block after the bad range */
8053 seq
= read_seqbegin(&bb
->lock
);
8058 /* Binary search between lo and hi for 'target'
8059 * i.e. for the last range that starts before 'target'
8061 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8062 * are known not to be the last range before target.
8063 * VARIANT: hi-lo is the number of possible
8064 * ranges, and decreases until it reaches 1
8066 while (hi
- lo
> 1) {
8067 int mid
= (lo
+ hi
) / 2;
8068 sector_t a
= BB_OFFSET(p
[mid
]);
8070 /* This could still be the one, earlier ranges
8074 /* This and later ranges are definitely out. */
8077 /* 'lo' might be the last that started before target, but 'hi' isn't */
8079 /* need to check all range that end after 's' to see if
8080 * any are unacknowledged.
8083 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8084 if (BB_OFFSET(p
[lo
]) < target
) {
8085 /* starts before the end, and finishes after
8086 * the start, so they must overlap
8088 if (rv
!= -1 && BB_ACK(p
[lo
]))
8092 *first_bad
= BB_OFFSET(p
[lo
]);
8093 *bad_sectors
= BB_LEN(p
[lo
]);
8099 if (read_seqretry(&bb
->lock
, seq
))
8104 EXPORT_SYMBOL_GPL(md_is_badblock
);
8107 * Add a range of bad blocks to the table.
8108 * This might extend the table, or might contract it
8109 * if two adjacent ranges can be merged.
8110 * We binary-search to find the 'insertion' point, then
8111 * decide how best to handle it.
8113 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8119 unsigned long flags
;
8122 /* badblocks are disabled */
8126 /* round the start down, and the end up */
8127 sector_t next
= s
+ sectors
;
8129 next
+= (1<<bb
->shift
) - 1;
8134 write_seqlock_irqsave(&bb
->lock
, flags
);
8139 /* Find the last range that starts at-or-before 's' */
8140 while (hi
- lo
> 1) {
8141 int mid
= (lo
+ hi
) / 2;
8142 sector_t a
= BB_OFFSET(p
[mid
]);
8148 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8152 /* we found a range that might merge with the start
8155 sector_t a
= BB_OFFSET(p
[lo
]);
8156 sector_t e
= a
+ BB_LEN(p
[lo
]);
8157 int ack
= BB_ACK(p
[lo
]);
8159 /* Yes, we can merge with a previous range */
8160 if (s
== a
&& s
+ sectors
>= e
)
8161 /* new range covers old */
8164 ack
= ack
&& acknowledged
;
8166 if (e
< s
+ sectors
)
8168 if (e
- a
<= BB_MAX_LEN
) {
8169 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8172 /* does not all fit in one range,
8173 * make p[lo] maximal
8175 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8176 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8182 if (sectors
&& hi
< bb
->count
) {
8183 /* 'hi' points to the first range that starts after 's'.
8184 * Maybe we can merge with the start of that range */
8185 sector_t a
= BB_OFFSET(p
[hi
]);
8186 sector_t e
= a
+ BB_LEN(p
[hi
]);
8187 int ack
= BB_ACK(p
[hi
]);
8188 if (a
<= s
+ sectors
) {
8189 /* merging is possible */
8190 if (e
<= s
+ sectors
) {
8195 ack
= ack
&& acknowledged
;
8198 if (e
- a
<= BB_MAX_LEN
) {
8199 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8202 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8210 if (sectors
== 0 && hi
< bb
->count
) {
8211 /* we might be able to combine lo and hi */
8212 /* Note: 's' is at the end of 'lo' */
8213 sector_t a
= BB_OFFSET(p
[hi
]);
8214 int lolen
= BB_LEN(p
[lo
]);
8215 int hilen
= BB_LEN(p
[hi
]);
8216 int newlen
= lolen
+ hilen
- (s
- a
);
8217 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8218 /* yes, we can combine them */
8219 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8220 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8221 memmove(p
+ hi
, p
+ hi
+ 1,
8222 (bb
->count
- hi
- 1) * 8);
8227 /* didn't merge (it all).
8228 * Need to add a range just before 'hi' */
8229 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8230 /* No room for more */
8234 int this_sectors
= sectors
;
8235 memmove(p
+ hi
+ 1, p
+ hi
,
8236 (bb
->count
- hi
) * 8);
8239 if (this_sectors
> BB_MAX_LEN
)
8240 this_sectors
= BB_MAX_LEN
;
8241 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8242 sectors
-= this_sectors
;
8249 bb
->unacked_exist
= 1;
8250 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8255 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8260 s
+= rdev
->new_data_offset
;
8262 s
+= rdev
->data_offset
;
8263 rv
= md_set_badblocks(&rdev
->badblocks
,
8266 /* Make sure they get written out promptly */
8267 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8268 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8269 md_wakeup_thread(rdev
->mddev
->thread
);
8273 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8276 * Remove a range of bad blocks from the table.
8277 * This may involve extending the table if we spilt a region,
8278 * but it must not fail. So if the table becomes full, we just
8279 * drop the remove request.
8281 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8285 sector_t target
= s
+ sectors
;
8288 if (bb
->shift
> 0) {
8289 /* When clearing we round the start up and the end down.
8290 * This should not matter as the shift should align with
8291 * the block size and no rounding should ever be needed.
8292 * However it is better the think a block is bad when it
8293 * isn't than to think a block is not bad when it is.
8295 s
+= (1<<bb
->shift
) - 1;
8297 target
>>= bb
->shift
;
8298 sectors
= target
- s
;
8301 write_seqlock_irq(&bb
->lock
);
8306 /* Find the last range that starts before 'target' */
8307 while (hi
- lo
> 1) {
8308 int mid
= (lo
+ hi
) / 2;
8309 sector_t a
= BB_OFFSET(p
[mid
]);
8316 /* p[lo] is the last range that could overlap the
8317 * current range. Earlier ranges could also overlap,
8318 * but only this one can overlap the end of the range.
8320 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8321 /* Partial overlap, leave the tail of this range */
8322 int ack
= BB_ACK(p
[lo
]);
8323 sector_t a
= BB_OFFSET(p
[lo
]);
8324 sector_t end
= a
+ BB_LEN(p
[lo
]);
8327 /* we need to split this range */
8328 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8332 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8334 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8337 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8338 /* there is no longer an overlap */
8343 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8344 /* This range does overlap */
8345 if (BB_OFFSET(p
[lo
]) < s
) {
8346 /* Keep the early parts of this range. */
8347 int ack
= BB_ACK(p
[lo
]);
8348 sector_t start
= BB_OFFSET(p
[lo
]);
8349 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8350 /* now low doesn't overlap, so.. */
8355 /* 'lo' is strictly before, 'hi' is strictly after,
8356 * anything between needs to be discarded
8359 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8360 bb
->count
-= (hi
- lo
- 1);
8366 write_sequnlock_irq(&bb
->lock
);
8370 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8374 s
+= rdev
->new_data_offset
;
8376 s
+= rdev
->data_offset
;
8377 return md_clear_badblocks(&rdev
->badblocks
,
8380 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8383 * Acknowledge all bad blocks in a list.
8384 * This only succeeds if ->changed is clear. It is used by
8385 * in-kernel metadata updates
8387 void md_ack_all_badblocks(struct badblocks
*bb
)
8389 if (bb
->page
== NULL
|| bb
->changed
)
8390 /* no point even trying */
8392 write_seqlock_irq(&bb
->lock
);
8394 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8397 for (i
= 0; i
< bb
->count
; i
++) {
8398 if (!BB_ACK(p
[i
])) {
8399 sector_t start
= BB_OFFSET(p
[i
]);
8400 int len
= BB_LEN(p
[i
]);
8401 p
[i
] = BB_MAKE(start
, len
, 1);
8404 bb
->unacked_exist
= 0;
8406 write_sequnlock_irq(&bb
->lock
);
8408 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8410 /* sysfs access to bad-blocks list.
8411 * We present two files.
8412 * 'bad-blocks' lists sector numbers and lengths of ranges that
8413 * are recorded as bad. The list is truncated to fit within
8414 * the one-page limit of sysfs.
8415 * Writing "sector length" to this file adds an acknowledged
8417 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8418 * been acknowledged. Writing to this file adds bad blocks
8419 * without acknowledging them. This is largely for testing.
8423 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8434 seq
= read_seqbegin(&bb
->lock
);
8439 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8440 sector_t s
= BB_OFFSET(p
[i
]);
8441 unsigned int length
= BB_LEN(p
[i
]);
8442 int ack
= BB_ACK(p
[i
]);
8448 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8449 (unsigned long long)s
<< bb
->shift
,
8450 length
<< bb
->shift
);
8452 if (unack
&& len
== 0)
8453 bb
->unacked_exist
= 0;
8455 if (read_seqretry(&bb
->lock
, seq
))
8464 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8466 unsigned long long sector
;
8470 /* Allow clearing via sysfs *only* for testing/debugging.
8471 * Normally only a successful write may clear a badblock
8474 if (page
[0] == '-') {
8478 #endif /* DO_DEBUG */
8480 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8482 if (newline
!= '\n')
8494 md_clear_badblocks(bb
, sector
, length
);
8497 #endif /* DO_DEBUG */
8498 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8504 static int md_notify_reboot(struct notifier_block
*this,
8505 unsigned long code
, void *x
)
8507 struct list_head
*tmp
;
8508 struct mddev
*mddev
;
8511 for_each_mddev(mddev
, tmp
) {
8512 if (mddev_trylock(mddev
)) {
8514 __md_stop_writes(mddev
);
8515 if (mddev
->persistent
)
8516 mddev
->safemode
= 2;
8517 mddev_unlock(mddev
);
8522 * certain more exotic SCSI devices are known to be
8523 * volatile wrt too early system reboots. While the
8524 * right place to handle this issue is the given
8525 * driver, we do want to have a safe RAID driver ...
8533 static struct notifier_block md_notifier
= {
8534 .notifier_call
= md_notify_reboot
,
8536 .priority
= INT_MAX
, /* before any real devices */
8539 static void md_geninit(void)
8541 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8543 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8546 static int __init
md_init(void)
8550 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8554 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8558 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8561 if ((ret
= register_blkdev(0, "mdp")) < 0)
8565 blk_register_region(MKDEV(MD_MAJOR
, 0), 512, THIS_MODULE
,
8566 md_probe
, NULL
, NULL
);
8567 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8568 md_probe
, NULL
, NULL
);
8570 register_reboot_notifier(&md_notifier
);
8571 raid_table_header
= register_sysctl_table(raid_root_table
);
8577 unregister_blkdev(MD_MAJOR
, "md");
8579 destroy_workqueue(md_misc_wq
);
8581 destroy_workqueue(md_wq
);
8589 * Searches all registered partitions for autorun RAID arrays
8593 static LIST_HEAD(all_detected_devices
);
8594 struct detected_devices_node
{
8595 struct list_head list
;
8599 void md_autodetect_dev(dev_t dev
)
8601 struct detected_devices_node
*node_detected_dev
;
8603 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8604 if (node_detected_dev
) {
8605 node_detected_dev
->dev
= dev
;
8606 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8608 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8609 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8613 static void autostart_arrays(int part
)
8615 struct md_rdev
*rdev
;
8616 struct detected_devices_node
*node_detected_dev
;
8618 int i_scanned
, i_passed
;
8623 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8625 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8627 node_detected_dev
= list_entry(all_detected_devices
.next
,
8628 struct detected_devices_node
, list
);
8629 list_del(&node_detected_dev
->list
);
8630 dev
= node_detected_dev
->dev
;
8631 kfree(node_detected_dev
);
8632 rdev
= md_import_device(dev
,0, 90);
8636 if (test_bit(Faulty
, &rdev
->flags
)) {
8640 set_bit(AutoDetected
, &rdev
->flags
);
8641 list_add(&rdev
->same_set
, &pending_raid_disks
);
8645 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8646 i_scanned
, i_passed
);
8648 autorun_devices(part
);
8651 #endif /* !MODULE */
8653 static __exit
void md_exit(void)
8655 struct mddev
*mddev
;
8656 struct list_head
*tmp
;
8659 blk_unregister_region(MKDEV(MD_MAJOR
,0), 512);
8660 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8662 unregister_blkdev(MD_MAJOR
,"md");
8663 unregister_blkdev(mdp_major
, "mdp");
8664 unregister_reboot_notifier(&md_notifier
);
8665 unregister_sysctl_table(raid_table_header
);
8667 /* We cannot unload the modules while some process is
8668 * waiting for us in select() or poll() - wake them up
8671 while (waitqueue_active(&md_event_waiters
)) {
8672 /* not safe to leave yet */
8673 wake_up(&md_event_waiters
);
8677 remove_proc_entry("mdstat", NULL
);
8679 for_each_mddev(mddev
, tmp
) {
8680 export_array(mddev
);
8681 mddev
->hold_active
= 0;
8683 destroy_workqueue(md_misc_wq
);
8684 destroy_workqueue(md_wq
);
8687 subsys_initcall(md_init
);
8688 module_exit(md_exit
)
8690 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8692 return sprintf(buffer
, "%d", start_readonly
);
8694 static int set_ro(const char *val
, struct kernel_param
*kp
)
8697 int num
= simple_strtoul(val
, &e
, 10);
8698 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8699 start_readonly
= num
;
8705 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8706 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8708 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8710 EXPORT_SYMBOL(register_md_personality
);
8711 EXPORT_SYMBOL(unregister_md_personality
);
8712 EXPORT_SYMBOL(md_error
);
8713 EXPORT_SYMBOL(md_done_sync
);
8714 EXPORT_SYMBOL(md_write_start
);
8715 EXPORT_SYMBOL(md_write_end
);
8716 EXPORT_SYMBOL(md_register_thread
);
8717 EXPORT_SYMBOL(md_unregister_thread
);
8718 EXPORT_SYMBOL(md_wakeup_thread
);
8719 EXPORT_SYMBOL(md_check_recovery
);
8720 EXPORT_SYMBOL(md_reap_sync_thread
);
8721 MODULE_LICENSE("GPL");
8722 MODULE_DESCRIPTION("MD RAID framework");
8724 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);