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
);
223 * iterates through all used mddevs in the system.
224 * We take care to grab the all_mddevs_lock whenever navigating
225 * the list, and to always hold a refcount when unlocked.
226 * Any code which breaks out of this loop while own
227 * a reference to the current mddev and must mddev_put it.
229 #define for_each_mddev(_mddev,_tmp) \
231 for (({ spin_lock(&all_mddevs_lock); \
232 _tmp = all_mddevs.next; \
234 ({ if (_tmp != &all_mddevs) \
235 mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\
236 spin_unlock(&all_mddevs_lock); \
237 if (_mddev) mddev_put(_mddev); \
238 _mddev = list_entry(_tmp, struct mddev, all_mddevs); \
239 _tmp != &all_mddevs;}); \
240 ({ spin_lock(&all_mddevs_lock); \
241 _tmp = _tmp->next;}) \
245 /* Rather than calling directly into the personality make_request function,
246 * IO requests come here first so that we can check if the device is
247 * being suspended pending a reconfiguration.
248 * We hold a refcount over the call to ->make_request. By the time that
249 * call has finished, the bio has been linked into some internal structure
250 * and so is visible to ->quiesce(), so we don't need the refcount any more.
252 static void md_make_request(struct request_queue
*q
, struct bio
*bio
)
254 const int rw
= bio_data_dir(bio
);
255 struct mddev
*mddev
= q
->queuedata
;
257 unsigned int sectors
;
259 if (mddev
== NULL
|| mddev
->pers
== NULL
264 if (mddev
->ro
== 1 && unlikely(rw
== WRITE
)) {
265 bio_endio(bio
, bio_sectors(bio
) == 0 ? 0 : -EROFS
);
268 smp_rmb(); /* Ensure implications of 'active' are visible */
270 if (mddev
->suspended
) {
273 prepare_to_wait(&mddev
->sb_wait
, &__wait
,
274 TASK_UNINTERRUPTIBLE
);
275 if (!mddev
->suspended
)
281 finish_wait(&mddev
->sb_wait
, &__wait
);
283 atomic_inc(&mddev
->active_io
);
287 * save the sectors now since our bio can
288 * go away inside make_request
290 sectors
= bio_sectors(bio
);
291 mddev
->pers
->make_request(mddev
, bio
);
293 cpu
= part_stat_lock();
294 part_stat_inc(cpu
, &mddev
->gendisk
->part0
, ios
[rw
]);
295 part_stat_add(cpu
, &mddev
->gendisk
->part0
, sectors
[rw
], sectors
);
298 if (atomic_dec_and_test(&mddev
->active_io
) && mddev
->suspended
)
299 wake_up(&mddev
->sb_wait
);
302 /* mddev_suspend makes sure no new requests are submitted
303 * to the device, and that any requests that have been submitted
304 * are completely handled.
305 * Once ->stop is called and completes, the module will be completely
308 void mddev_suspend(struct mddev
*mddev
)
310 BUG_ON(mddev
->suspended
);
311 mddev
->suspended
= 1;
313 wait_event(mddev
->sb_wait
, atomic_read(&mddev
->active_io
) == 0);
314 mddev
->pers
->quiesce(mddev
, 1);
316 del_timer_sync(&mddev
->safemode_timer
);
318 EXPORT_SYMBOL_GPL(mddev_suspend
);
320 void mddev_resume(struct mddev
*mddev
)
322 mddev
->suspended
= 0;
323 wake_up(&mddev
->sb_wait
);
324 mddev
->pers
->quiesce(mddev
, 0);
326 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
327 md_wakeup_thread(mddev
->thread
);
328 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
330 EXPORT_SYMBOL_GPL(mddev_resume
);
332 int mddev_congested(struct mddev
*mddev
, int bits
)
334 return mddev
->suspended
;
336 EXPORT_SYMBOL(mddev_congested
);
339 * Generic flush handling for md
342 static void md_end_flush(struct bio
*bio
, int err
)
344 struct md_rdev
*rdev
= bio
->bi_private
;
345 struct mddev
*mddev
= rdev
->mddev
;
347 rdev_dec_pending(rdev
, mddev
);
349 if (atomic_dec_and_test(&mddev
->flush_pending
)) {
350 /* The pre-request flush has finished */
351 queue_work(md_wq
, &mddev
->flush_work
);
356 static void md_submit_flush_data(struct work_struct
*ws
);
358 static void submit_flushes(struct work_struct
*ws
)
360 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
361 struct md_rdev
*rdev
;
363 INIT_WORK(&mddev
->flush_work
, md_submit_flush_data
);
364 atomic_set(&mddev
->flush_pending
, 1);
366 rdev_for_each_rcu(rdev
, mddev
)
367 if (rdev
->raid_disk
>= 0 &&
368 !test_bit(Faulty
, &rdev
->flags
)) {
369 /* Take two references, one is dropped
370 * when request finishes, one after
371 * we reclaim rcu_read_lock
374 atomic_inc(&rdev
->nr_pending
);
375 atomic_inc(&rdev
->nr_pending
);
377 bi
= bio_alloc_mddev(GFP_NOIO
, 0, mddev
);
378 bi
->bi_end_io
= md_end_flush
;
379 bi
->bi_private
= rdev
;
380 bi
->bi_bdev
= rdev
->bdev
;
381 atomic_inc(&mddev
->flush_pending
);
382 submit_bio(WRITE_FLUSH
, bi
);
384 rdev_dec_pending(rdev
, mddev
);
387 if (atomic_dec_and_test(&mddev
->flush_pending
))
388 queue_work(md_wq
, &mddev
->flush_work
);
391 static void md_submit_flush_data(struct work_struct
*ws
)
393 struct mddev
*mddev
= container_of(ws
, struct mddev
, flush_work
);
394 struct bio
*bio
= mddev
->flush_bio
;
396 if (bio
->bi_size
== 0)
397 /* an empty barrier - all done */
400 bio
->bi_rw
&= ~REQ_FLUSH
;
401 mddev
->pers
->make_request(mddev
, bio
);
404 mddev
->flush_bio
= NULL
;
405 wake_up(&mddev
->sb_wait
);
408 void md_flush_request(struct mddev
*mddev
, struct bio
*bio
)
410 spin_lock_irq(&mddev
->write_lock
);
411 wait_event_lock_irq(mddev
->sb_wait
,
414 mddev
->flush_bio
= bio
;
415 spin_unlock_irq(&mddev
->write_lock
);
417 INIT_WORK(&mddev
->flush_work
, submit_flushes
);
418 queue_work(md_wq
, &mddev
->flush_work
);
420 EXPORT_SYMBOL(md_flush_request
);
422 void md_unplug(struct blk_plug_cb
*cb
, bool from_schedule
)
424 struct mddev
*mddev
= cb
->data
;
425 md_wakeup_thread(mddev
->thread
);
428 EXPORT_SYMBOL(md_unplug
);
430 static inline struct mddev
*mddev_get(struct mddev
*mddev
)
432 atomic_inc(&mddev
->active
);
436 static void mddev_delayed_delete(struct work_struct
*ws
);
438 static void mddev_put(struct mddev
*mddev
)
440 struct bio_set
*bs
= NULL
;
442 if (!atomic_dec_and_lock(&mddev
->active
, &all_mddevs_lock
))
444 if (!mddev
->raid_disks
&& list_empty(&mddev
->disks
) &&
445 mddev
->ctime
== 0 && !mddev
->hold_active
) {
446 /* Array is not configured at all, and not held active,
448 list_del_init(&mddev
->all_mddevs
);
450 mddev
->bio_set
= NULL
;
451 if (mddev
->gendisk
) {
452 /* We did a probe so need to clean up. Call
453 * queue_work inside the spinlock so that
454 * flush_workqueue() after mddev_find will
455 * succeed in waiting for the work to be done.
457 INIT_WORK(&mddev
->del_work
, mddev_delayed_delete
);
458 queue_work(md_misc_wq
, &mddev
->del_work
);
462 spin_unlock(&all_mddevs_lock
);
467 void mddev_init(struct mddev
*mddev
)
469 mutex_init(&mddev
->open_mutex
);
470 mutex_init(&mddev
->reconfig_mutex
);
471 mutex_init(&mddev
->bitmap_info
.mutex
);
472 INIT_LIST_HEAD(&mddev
->disks
);
473 INIT_LIST_HEAD(&mddev
->all_mddevs
);
474 init_timer(&mddev
->safemode_timer
);
475 atomic_set(&mddev
->active
, 1);
476 atomic_set(&mddev
->openers
, 0);
477 atomic_set(&mddev
->active_io
, 0);
478 spin_lock_init(&mddev
->write_lock
);
479 atomic_set(&mddev
->flush_pending
, 0);
480 init_waitqueue_head(&mddev
->sb_wait
);
481 init_waitqueue_head(&mddev
->recovery_wait
);
482 mddev
->reshape_position
= MaxSector
;
483 mddev
->reshape_backwards
= 0;
484 mddev
->last_sync_action
= "none";
485 mddev
->resync_min
= 0;
486 mddev
->resync_max
= MaxSector
;
487 mddev
->level
= LEVEL_NONE
;
489 EXPORT_SYMBOL_GPL(mddev_init
);
491 static struct mddev
* mddev_find(dev_t unit
)
493 struct mddev
*mddev
, *new = NULL
;
495 if (unit
&& MAJOR(unit
) != MD_MAJOR
)
496 unit
&= ~((1<<MdpMinorShift
)-1);
499 spin_lock(&all_mddevs_lock
);
502 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
503 if (mddev
->unit
== unit
) {
505 spin_unlock(&all_mddevs_lock
);
511 list_add(&new->all_mddevs
, &all_mddevs
);
512 spin_unlock(&all_mddevs_lock
);
513 new->hold_active
= UNTIL_IOCTL
;
517 /* find an unused unit number */
518 static int next_minor
= 512;
519 int start
= next_minor
;
523 dev
= MKDEV(MD_MAJOR
, next_minor
);
525 if (next_minor
> MINORMASK
)
527 if (next_minor
== start
) {
528 /* Oh dear, all in use. */
529 spin_unlock(&all_mddevs_lock
);
535 list_for_each_entry(mddev
, &all_mddevs
, all_mddevs
)
536 if (mddev
->unit
== dev
) {
542 new->md_minor
= MINOR(dev
);
543 new->hold_active
= UNTIL_STOP
;
544 list_add(&new->all_mddevs
, &all_mddevs
);
545 spin_unlock(&all_mddevs_lock
);
548 spin_unlock(&all_mddevs_lock
);
550 new = kzalloc(sizeof(*new), GFP_KERNEL
);
555 if (MAJOR(unit
) == MD_MAJOR
)
556 new->md_minor
= MINOR(unit
);
558 new->md_minor
= MINOR(unit
) >> MdpMinorShift
;
565 static inline int __must_check
mddev_lock(struct mddev
* mddev
)
567 return mutex_lock_interruptible(&mddev
->reconfig_mutex
);
570 /* Sometimes we need to take the lock in a situation where
571 * failure due to interrupts is not acceptable.
573 static inline void mddev_lock_nointr(struct mddev
* mddev
)
575 mutex_lock(&mddev
->reconfig_mutex
);
578 static inline int mddev_is_locked(struct mddev
*mddev
)
580 return mutex_is_locked(&mddev
->reconfig_mutex
);
583 static inline int mddev_trylock(struct mddev
* mddev
)
585 return mutex_trylock(&mddev
->reconfig_mutex
);
588 static struct attribute_group md_redundancy_group
;
590 static void mddev_unlock(struct mddev
* mddev
)
592 if (mddev
->to_remove
) {
593 /* These cannot be removed under reconfig_mutex as
594 * an access to the files will try to take reconfig_mutex
595 * while holding the file unremovable, which leads to
597 * So hold set sysfs_active while the remove in happeing,
598 * and anything else which might set ->to_remove or my
599 * otherwise change the sysfs namespace will fail with
600 * -EBUSY if sysfs_active is still set.
601 * We set sysfs_active under reconfig_mutex and elsewhere
602 * test it under the same mutex to ensure its correct value
605 struct attribute_group
*to_remove
= mddev
->to_remove
;
606 mddev
->to_remove
= NULL
;
607 mddev
->sysfs_active
= 1;
608 mutex_unlock(&mddev
->reconfig_mutex
);
610 if (mddev
->kobj
.sd
) {
611 if (to_remove
!= &md_redundancy_group
)
612 sysfs_remove_group(&mddev
->kobj
, to_remove
);
613 if (mddev
->pers
== NULL
||
614 mddev
->pers
->sync_request
== NULL
) {
615 sysfs_remove_group(&mddev
->kobj
, &md_redundancy_group
);
616 if (mddev
->sysfs_action
)
617 sysfs_put(mddev
->sysfs_action
);
618 mddev
->sysfs_action
= NULL
;
621 mddev
->sysfs_active
= 0;
623 mutex_unlock(&mddev
->reconfig_mutex
);
625 /* As we've dropped the mutex we need a spinlock to
626 * make sure the thread doesn't disappear
628 spin_lock(&pers_lock
);
629 md_wakeup_thread(mddev
->thread
);
630 spin_unlock(&pers_lock
);
633 static struct md_rdev
* find_rdev_nr(struct mddev
*mddev
, int nr
)
635 struct md_rdev
*rdev
;
637 rdev_for_each(rdev
, mddev
)
638 if (rdev
->desc_nr
== nr
)
644 static struct md_rdev
*find_rdev_nr_rcu(struct mddev
*mddev
, int nr
)
646 struct md_rdev
*rdev
;
648 rdev_for_each_rcu(rdev
, mddev
)
649 if (rdev
->desc_nr
== nr
)
655 static struct md_rdev
*find_rdev(struct mddev
*mddev
, dev_t dev
)
657 struct md_rdev
*rdev
;
659 rdev_for_each(rdev
, mddev
)
660 if (rdev
->bdev
->bd_dev
== dev
)
666 static struct md_rdev
*find_rdev_rcu(struct mddev
*mddev
, dev_t dev
)
668 struct md_rdev
*rdev
;
670 rdev_for_each_rcu(rdev
, mddev
)
671 if (rdev
->bdev
->bd_dev
== dev
)
677 static struct md_personality
*find_pers(int level
, char *clevel
)
679 struct md_personality
*pers
;
680 list_for_each_entry(pers
, &pers_list
, list
) {
681 if (level
!= LEVEL_NONE
&& pers
->level
== level
)
683 if (strcmp(pers
->name
, clevel
)==0)
689 /* return the offset of the super block in 512byte sectors */
690 static inline sector_t
calc_dev_sboffset(struct md_rdev
*rdev
)
692 sector_t num_sectors
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
693 return MD_NEW_SIZE_SECTORS(num_sectors
);
696 static int alloc_disk_sb(struct md_rdev
* rdev
)
701 rdev
->sb_page
= alloc_page(GFP_KERNEL
);
702 if (!rdev
->sb_page
) {
703 printk(KERN_ALERT
"md: out of memory.\n");
710 void md_rdev_clear(struct md_rdev
*rdev
)
713 put_page(rdev
->sb_page
);
715 rdev
->sb_page
= NULL
;
720 put_page(rdev
->bb_page
);
721 rdev
->bb_page
= NULL
;
723 kfree(rdev
->badblocks
.page
);
724 rdev
->badblocks
.page
= NULL
;
726 EXPORT_SYMBOL_GPL(md_rdev_clear
);
728 static void super_written(struct bio
*bio
, int error
)
730 struct md_rdev
*rdev
= bio
->bi_private
;
731 struct mddev
*mddev
= rdev
->mddev
;
733 if (error
|| !test_bit(BIO_UPTODATE
, &bio
->bi_flags
)) {
734 printk("md: super_written gets error=%d, uptodate=%d\n",
735 error
, test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
736 WARN_ON(test_bit(BIO_UPTODATE
, &bio
->bi_flags
));
737 md_error(mddev
, rdev
);
740 if (atomic_dec_and_test(&mddev
->pending_writes
))
741 wake_up(&mddev
->sb_wait
);
745 void md_super_write(struct mddev
*mddev
, struct md_rdev
*rdev
,
746 sector_t sector
, int size
, struct page
*page
)
748 /* write first size bytes of page to sector of rdev
749 * Increment mddev->pending_writes before returning
750 * and decrement it on completion, waking up sb_wait
751 * if zero is reached.
752 * If an error occurred, call md_error
754 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, mddev
);
756 bio
->bi_bdev
= rdev
->meta_bdev
? rdev
->meta_bdev
: rdev
->bdev
;
757 bio
->bi_sector
= sector
;
758 bio_add_page(bio
, page
, size
, 0);
759 bio
->bi_private
= rdev
;
760 bio
->bi_end_io
= super_written
;
762 atomic_inc(&mddev
->pending_writes
);
763 submit_bio(WRITE_FLUSH_FUA
, bio
);
766 void md_super_wait(struct mddev
*mddev
)
768 /* wait for all superblock writes that were scheduled to complete */
771 prepare_to_wait(&mddev
->sb_wait
, &wq
, TASK_UNINTERRUPTIBLE
);
772 if (atomic_read(&mddev
->pending_writes
)==0)
776 finish_wait(&mddev
->sb_wait
, &wq
);
779 int sync_page_io(struct md_rdev
*rdev
, sector_t sector
, int size
,
780 struct page
*page
, int rw
, bool metadata_op
)
782 struct bio
*bio
= bio_alloc_mddev(GFP_NOIO
, 1, rdev
->mddev
);
787 bio
->bi_bdev
= (metadata_op
&& rdev
->meta_bdev
) ?
788 rdev
->meta_bdev
: rdev
->bdev
;
790 bio
->bi_sector
= sector
+ rdev
->sb_start
;
791 else if (rdev
->mddev
->reshape_position
!= MaxSector
&&
792 (rdev
->mddev
->reshape_backwards
==
793 (sector
>= rdev
->mddev
->reshape_position
)))
794 bio
->bi_sector
= sector
+ rdev
->new_data_offset
;
796 bio
->bi_sector
= sector
+ rdev
->data_offset
;
797 bio_add_page(bio
, page
, size
, 0);
798 submit_bio_wait(rw
, bio
);
800 ret
= test_bit(BIO_UPTODATE
, &bio
->bi_flags
);
804 EXPORT_SYMBOL_GPL(sync_page_io
);
806 static int read_disk_sb(struct md_rdev
* rdev
, int size
)
808 char b
[BDEVNAME_SIZE
];
809 if (!rdev
->sb_page
) {
817 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, READ
, true))
823 printk(KERN_WARNING
"md: disabled device %s, could not read superblock.\n",
824 bdevname(rdev
->bdev
,b
));
828 static int uuid_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
830 return sb1
->set_uuid0
== sb2
->set_uuid0
&&
831 sb1
->set_uuid1
== sb2
->set_uuid1
&&
832 sb1
->set_uuid2
== sb2
->set_uuid2
&&
833 sb1
->set_uuid3
== sb2
->set_uuid3
;
836 static int sb_equal(mdp_super_t
*sb1
, mdp_super_t
*sb2
)
839 mdp_super_t
*tmp1
, *tmp2
;
841 tmp1
= kmalloc(sizeof(*tmp1
),GFP_KERNEL
);
842 tmp2
= kmalloc(sizeof(*tmp2
),GFP_KERNEL
);
844 if (!tmp1
|| !tmp2
) {
846 printk(KERN_INFO
"md.c sb_equal(): failed to allocate memory!\n");
854 * nr_disks is not constant
859 ret
= (memcmp(tmp1
, tmp2
, MD_SB_GENERIC_CONSTANT_WORDS
* 4) == 0);
867 static u32
md_csum_fold(u32 csum
)
869 csum
= (csum
& 0xffff) + (csum
>> 16);
870 return (csum
& 0xffff) + (csum
>> 16);
873 static unsigned int calc_sb_csum(mdp_super_t
* sb
)
876 u32
*sb32
= (u32
*)sb
;
878 unsigned int disk_csum
, csum
;
880 disk_csum
= sb
->sb_csum
;
883 for (i
= 0; i
< MD_SB_BYTES
/4 ; i
++)
885 csum
= (newcsum
& 0xffffffff) + (newcsum
>>32);
889 /* This used to use csum_partial, which was wrong for several
890 * reasons including that different results are returned on
891 * different architectures. It isn't critical that we get exactly
892 * the same return value as before (we always csum_fold before
893 * testing, and that removes any differences). However as we
894 * know that csum_partial always returned a 16bit value on
895 * alphas, do a fold to maximise conformity to previous behaviour.
897 sb
->sb_csum
= md_csum_fold(disk_csum
);
899 sb
->sb_csum
= disk_csum
;
906 * Handle superblock details.
907 * We want to be able to handle multiple superblock formats
908 * so we have a common interface to them all, and an array of
909 * different handlers.
910 * We rely on user-space to write the initial superblock, and support
911 * reading and updating of superblocks.
912 * Interface methods are:
913 * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version)
914 * loads and validates a superblock on dev.
915 * if refdev != NULL, compare superblocks on both devices
917 * 0 - dev has a superblock that is compatible with refdev
918 * 1 - dev has a superblock that is compatible and newer than refdev
919 * so dev should be used as the refdev in future
920 * -EINVAL superblock incompatible or invalid
921 * -othererror e.g. -EIO
923 * int validate_super(struct mddev *mddev, struct md_rdev *dev)
924 * Verify that dev is acceptable into mddev.
925 * The first time, mddev->raid_disks will be 0, and data from
926 * dev should be merged in. Subsequent calls check that dev
927 * is new enough. Return 0 or -EINVAL
929 * void sync_super(struct mddev *mddev, struct md_rdev *dev)
930 * Update the superblock for rdev with data in mddev
931 * This does not write to disc.
937 struct module
*owner
;
938 int (*load_super
)(struct md_rdev
*rdev
,
939 struct md_rdev
*refdev
,
941 int (*validate_super
)(struct mddev
*mddev
,
942 struct md_rdev
*rdev
);
943 void (*sync_super
)(struct mddev
*mddev
,
944 struct md_rdev
*rdev
);
945 unsigned long long (*rdev_size_change
)(struct md_rdev
*rdev
,
946 sector_t num_sectors
);
947 int (*allow_new_offset
)(struct md_rdev
*rdev
,
948 unsigned long long new_offset
);
952 * Check that the given mddev has no bitmap.
954 * This function is called from the run method of all personalities that do not
955 * support bitmaps. It prints an error message and returns non-zero if mddev
956 * has a bitmap. Otherwise, it returns 0.
959 int md_check_no_bitmap(struct mddev
*mddev
)
961 if (!mddev
->bitmap_info
.file
&& !mddev
->bitmap_info
.offset
)
963 printk(KERN_ERR
"%s: bitmaps are not supported for %s\n",
964 mdname(mddev
), mddev
->pers
->name
);
967 EXPORT_SYMBOL(md_check_no_bitmap
);
970 * load_super for 0.90.0
972 static int super_90_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
974 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
979 * Calculate the position of the superblock (512byte sectors),
980 * it's at the end of the disk.
982 * It also happens to be a multiple of 4Kb.
984 rdev
->sb_start
= calc_dev_sboffset(rdev
);
986 ret
= read_disk_sb(rdev
, MD_SB_BYTES
);
991 bdevname(rdev
->bdev
, b
);
992 sb
= page_address(rdev
->sb_page
);
994 if (sb
->md_magic
!= MD_SB_MAGIC
) {
995 printk(KERN_ERR
"md: invalid raid superblock magic on %s\n",
1000 if (sb
->major_version
!= 0 ||
1001 sb
->minor_version
< 90 ||
1002 sb
->minor_version
> 91) {
1003 printk(KERN_WARNING
"Bad version number %d.%d on %s\n",
1004 sb
->major_version
, sb
->minor_version
,
1009 if (sb
->raid_disks
<= 0)
1012 if (md_csum_fold(calc_sb_csum(sb
)) != md_csum_fold(sb
->sb_csum
)) {
1013 printk(KERN_WARNING
"md: invalid superblock checksum on %s\n",
1018 rdev
->preferred_minor
= sb
->md_minor
;
1019 rdev
->data_offset
= 0;
1020 rdev
->new_data_offset
= 0;
1021 rdev
->sb_size
= MD_SB_BYTES
;
1022 rdev
->badblocks
.shift
= -1;
1024 if (sb
->level
== LEVEL_MULTIPATH
)
1027 rdev
->desc_nr
= sb
->this_disk
.number
;
1033 mdp_super_t
*refsb
= page_address(refdev
->sb_page
);
1034 if (!uuid_equal(refsb
, sb
)) {
1035 printk(KERN_WARNING
"md: %s has different UUID to %s\n",
1036 b
, bdevname(refdev
->bdev
,b2
));
1039 if (!sb_equal(refsb
, sb
)) {
1040 printk(KERN_WARNING
"md: %s has same UUID"
1041 " but different superblock to %s\n",
1042 b
, bdevname(refdev
->bdev
, b2
));
1046 ev2
= md_event(refsb
);
1052 rdev
->sectors
= rdev
->sb_start
;
1053 /* Limit to 4TB as metadata cannot record more than that.
1054 * (not needed for Linear and RAID0 as metadata doesn't
1057 if (rdev
->sectors
>= (2ULL << 32) && sb
->level
>= 1)
1058 rdev
->sectors
= (2ULL << 32) - 2;
1060 if (rdev
->sectors
< ((sector_t
)sb
->size
) * 2 && sb
->level
>= 1)
1061 /* "this cannot possibly happen" ... */
1069 * validate_super for 0.90.0
1071 static int super_90_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1074 mdp_super_t
*sb
= page_address(rdev
->sb_page
);
1075 __u64 ev1
= md_event(sb
);
1077 rdev
->raid_disk
= -1;
1078 clear_bit(Faulty
, &rdev
->flags
);
1079 clear_bit(In_sync
, &rdev
->flags
);
1080 clear_bit(Bitmap_sync
, &rdev
->flags
);
1081 clear_bit(WriteMostly
, &rdev
->flags
);
1083 if (mddev
->raid_disks
== 0) {
1084 mddev
->major_version
= 0;
1085 mddev
->minor_version
= sb
->minor_version
;
1086 mddev
->patch_version
= sb
->patch_version
;
1087 mddev
->external
= 0;
1088 mddev
->chunk_sectors
= sb
->chunk_size
>> 9;
1089 mddev
->ctime
= sb
->ctime
;
1090 mddev
->utime
= sb
->utime
;
1091 mddev
->level
= sb
->level
;
1092 mddev
->clevel
[0] = 0;
1093 mddev
->layout
= sb
->layout
;
1094 mddev
->raid_disks
= sb
->raid_disks
;
1095 mddev
->dev_sectors
= ((sector_t
)sb
->size
) * 2;
1096 mddev
->events
= ev1
;
1097 mddev
->bitmap_info
.offset
= 0;
1098 mddev
->bitmap_info
.space
= 0;
1099 /* bitmap can use 60 K after the 4K superblocks */
1100 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
1101 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
1102 mddev
->reshape_backwards
= 0;
1104 if (mddev
->minor_version
>= 91) {
1105 mddev
->reshape_position
= sb
->reshape_position
;
1106 mddev
->delta_disks
= sb
->delta_disks
;
1107 mddev
->new_level
= sb
->new_level
;
1108 mddev
->new_layout
= sb
->new_layout
;
1109 mddev
->new_chunk_sectors
= sb
->new_chunk
>> 9;
1110 if (mddev
->delta_disks
< 0)
1111 mddev
->reshape_backwards
= 1;
1113 mddev
->reshape_position
= MaxSector
;
1114 mddev
->delta_disks
= 0;
1115 mddev
->new_level
= mddev
->level
;
1116 mddev
->new_layout
= mddev
->layout
;
1117 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1120 if (sb
->state
& (1<<MD_SB_CLEAN
))
1121 mddev
->recovery_cp
= MaxSector
;
1123 if (sb
->events_hi
== sb
->cp_events_hi
&&
1124 sb
->events_lo
== sb
->cp_events_lo
) {
1125 mddev
->recovery_cp
= sb
->recovery_cp
;
1127 mddev
->recovery_cp
= 0;
1130 memcpy(mddev
->uuid
+0, &sb
->set_uuid0
, 4);
1131 memcpy(mddev
->uuid
+4, &sb
->set_uuid1
, 4);
1132 memcpy(mddev
->uuid
+8, &sb
->set_uuid2
, 4);
1133 memcpy(mddev
->uuid
+12,&sb
->set_uuid3
, 4);
1135 mddev
->max_disks
= MD_SB_DISKS
;
1137 if (sb
->state
& (1<<MD_SB_BITMAP_PRESENT
) &&
1138 mddev
->bitmap_info
.file
== NULL
) {
1139 mddev
->bitmap_info
.offset
=
1140 mddev
->bitmap_info
.default_offset
;
1141 mddev
->bitmap_info
.space
=
1142 mddev
->bitmap_info
.default_space
;
1145 } else if (mddev
->pers
== NULL
) {
1146 /* Insist on good event counter while assembling, except
1147 * for spares (which don't need an event count) */
1149 if (sb
->disks
[rdev
->desc_nr
].state
& (
1150 (1<<MD_DISK_SYNC
) | (1 << MD_DISK_ACTIVE
)))
1151 if (ev1
< mddev
->events
)
1153 } else if (mddev
->bitmap
) {
1154 /* if adding to array with a bitmap, then we can accept an
1155 * older device ... but not too old.
1157 if (ev1
< mddev
->bitmap
->events_cleared
)
1159 if (ev1
< mddev
->events
)
1160 set_bit(Bitmap_sync
, &rdev
->flags
);
1162 if (ev1
< mddev
->events
)
1163 /* just a hot-add of a new device, leave raid_disk at -1 */
1167 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1168 desc
= sb
->disks
+ rdev
->desc_nr
;
1170 if (desc
->state
& (1<<MD_DISK_FAULTY
))
1171 set_bit(Faulty
, &rdev
->flags
);
1172 else if (desc
->state
& (1<<MD_DISK_SYNC
) /* &&
1173 desc->raid_disk < mddev->raid_disks */) {
1174 set_bit(In_sync
, &rdev
->flags
);
1175 rdev
->raid_disk
= desc
->raid_disk
;
1176 rdev
->saved_raid_disk
= desc
->raid_disk
;
1177 } else if (desc
->state
& (1<<MD_DISK_ACTIVE
)) {
1178 /* active but not in sync implies recovery up to
1179 * reshape position. We don't know exactly where
1180 * that is, so set to zero for now */
1181 if (mddev
->minor_version
>= 91) {
1182 rdev
->recovery_offset
= 0;
1183 rdev
->raid_disk
= desc
->raid_disk
;
1186 if (desc
->state
& (1<<MD_DISK_WRITEMOSTLY
))
1187 set_bit(WriteMostly
, &rdev
->flags
);
1188 } else /* MULTIPATH are always insync */
1189 set_bit(In_sync
, &rdev
->flags
);
1194 * sync_super for 0.90.0
1196 static void super_90_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1199 struct md_rdev
*rdev2
;
1200 int next_spare
= mddev
->raid_disks
;
1203 /* make rdev->sb match mddev data..
1206 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
1207 * 3/ any empty disks < next_spare become removed
1209 * disks[0] gets initialised to REMOVED because
1210 * we cannot be sure from other fields if it has
1211 * been initialised or not.
1214 int active
=0, working
=0,failed
=0,spare
=0,nr_disks
=0;
1216 rdev
->sb_size
= MD_SB_BYTES
;
1218 sb
= page_address(rdev
->sb_page
);
1220 memset(sb
, 0, sizeof(*sb
));
1222 sb
->md_magic
= MD_SB_MAGIC
;
1223 sb
->major_version
= mddev
->major_version
;
1224 sb
->patch_version
= mddev
->patch_version
;
1225 sb
->gvalid_words
= 0; /* ignored */
1226 memcpy(&sb
->set_uuid0
, mddev
->uuid
+0, 4);
1227 memcpy(&sb
->set_uuid1
, mddev
->uuid
+4, 4);
1228 memcpy(&sb
->set_uuid2
, mddev
->uuid
+8, 4);
1229 memcpy(&sb
->set_uuid3
, mddev
->uuid
+12,4);
1231 sb
->ctime
= mddev
->ctime
;
1232 sb
->level
= mddev
->level
;
1233 sb
->size
= mddev
->dev_sectors
/ 2;
1234 sb
->raid_disks
= mddev
->raid_disks
;
1235 sb
->md_minor
= mddev
->md_minor
;
1236 sb
->not_persistent
= 0;
1237 sb
->utime
= mddev
->utime
;
1239 sb
->events_hi
= (mddev
->events
>>32);
1240 sb
->events_lo
= (u32
)mddev
->events
;
1242 if (mddev
->reshape_position
== MaxSector
)
1243 sb
->minor_version
= 90;
1245 sb
->minor_version
= 91;
1246 sb
->reshape_position
= mddev
->reshape_position
;
1247 sb
->new_level
= mddev
->new_level
;
1248 sb
->delta_disks
= mddev
->delta_disks
;
1249 sb
->new_layout
= mddev
->new_layout
;
1250 sb
->new_chunk
= mddev
->new_chunk_sectors
<< 9;
1252 mddev
->minor_version
= sb
->minor_version
;
1255 sb
->recovery_cp
= mddev
->recovery_cp
;
1256 sb
->cp_events_hi
= (mddev
->events
>>32);
1257 sb
->cp_events_lo
= (u32
)mddev
->events
;
1258 if (mddev
->recovery_cp
== MaxSector
)
1259 sb
->state
= (1<< MD_SB_CLEAN
);
1261 sb
->recovery_cp
= 0;
1263 sb
->layout
= mddev
->layout
;
1264 sb
->chunk_size
= mddev
->chunk_sectors
<< 9;
1266 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
)
1267 sb
->state
|= (1<<MD_SB_BITMAP_PRESENT
);
1269 sb
->disks
[0].state
= (1<<MD_DISK_REMOVED
);
1270 rdev_for_each(rdev2
, mddev
) {
1273 int is_active
= test_bit(In_sync
, &rdev2
->flags
);
1275 if (rdev2
->raid_disk
>= 0 &&
1276 sb
->minor_version
>= 91)
1277 /* we have nowhere to store the recovery_offset,
1278 * but if it is not below the reshape_position,
1279 * we can piggy-back on that.
1282 if (rdev2
->raid_disk
< 0 ||
1283 test_bit(Faulty
, &rdev2
->flags
))
1286 desc_nr
= rdev2
->raid_disk
;
1288 desc_nr
= next_spare
++;
1289 rdev2
->desc_nr
= desc_nr
;
1290 d
= &sb
->disks
[rdev2
->desc_nr
];
1292 d
->number
= rdev2
->desc_nr
;
1293 d
->major
= MAJOR(rdev2
->bdev
->bd_dev
);
1294 d
->minor
= MINOR(rdev2
->bdev
->bd_dev
);
1296 d
->raid_disk
= rdev2
->raid_disk
;
1298 d
->raid_disk
= rdev2
->desc_nr
; /* compatibility */
1299 if (test_bit(Faulty
, &rdev2
->flags
))
1300 d
->state
= (1<<MD_DISK_FAULTY
);
1301 else if (is_active
) {
1302 d
->state
= (1<<MD_DISK_ACTIVE
);
1303 if (test_bit(In_sync
, &rdev2
->flags
))
1304 d
->state
|= (1<<MD_DISK_SYNC
);
1312 if (test_bit(WriteMostly
, &rdev2
->flags
))
1313 d
->state
|= (1<<MD_DISK_WRITEMOSTLY
);
1315 /* now set the "removed" and "faulty" bits on any missing devices */
1316 for (i
=0 ; i
< mddev
->raid_disks
; i
++) {
1317 mdp_disk_t
*d
= &sb
->disks
[i
];
1318 if (d
->state
== 0 && d
->number
== 0) {
1321 d
->state
= (1<<MD_DISK_REMOVED
);
1322 d
->state
|= (1<<MD_DISK_FAULTY
);
1326 sb
->nr_disks
= nr_disks
;
1327 sb
->active_disks
= active
;
1328 sb
->working_disks
= working
;
1329 sb
->failed_disks
= failed
;
1330 sb
->spare_disks
= spare
;
1332 sb
->this_disk
= sb
->disks
[rdev
->desc_nr
];
1333 sb
->sb_csum
= calc_sb_csum(sb
);
1337 * rdev_size_change for 0.90.0
1339 static unsigned long long
1340 super_90_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1342 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1343 return 0; /* component must fit device */
1344 if (rdev
->mddev
->bitmap_info
.offset
)
1345 return 0; /* can't move bitmap */
1346 rdev
->sb_start
= calc_dev_sboffset(rdev
);
1347 if (!num_sectors
|| num_sectors
> rdev
->sb_start
)
1348 num_sectors
= rdev
->sb_start
;
1349 /* Limit to 4TB as metadata cannot record more than that.
1350 * 4TB == 2^32 KB, or 2*2^32 sectors.
1352 if (num_sectors
>= (2ULL << 32) && rdev
->mddev
->level
>= 1)
1353 num_sectors
= (2ULL << 32) - 2;
1354 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1356 md_super_wait(rdev
->mddev
);
1361 super_90_allow_new_offset(struct md_rdev
*rdev
, unsigned long long new_offset
)
1363 /* non-zero offset changes not possible with v0.90 */
1364 return new_offset
== 0;
1368 * version 1 superblock
1371 static __le32
calc_sb_1_csum(struct mdp_superblock_1
* sb
)
1375 unsigned long long newcsum
;
1376 int size
= 256 + le32_to_cpu(sb
->max_dev
)*2;
1377 __le32
*isuper
= (__le32
*)sb
;
1379 disk_csum
= sb
->sb_csum
;
1382 for (; size
>= 4; size
-= 4)
1383 newcsum
+= le32_to_cpu(*isuper
++);
1386 newcsum
+= le16_to_cpu(*(__le16
*) isuper
);
1388 csum
= (newcsum
& 0xffffffff) + (newcsum
>> 32);
1389 sb
->sb_csum
= disk_csum
;
1390 return cpu_to_le32(csum
);
1393 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
1395 static int super_1_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
, int minor_version
)
1397 struct mdp_superblock_1
*sb
;
1401 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
1405 * Calculate the position of the superblock in 512byte sectors.
1406 * It is always aligned to a 4K boundary and
1407 * depeding on minor_version, it can be:
1408 * 0: At least 8K, but less than 12K, from end of device
1409 * 1: At start of device
1410 * 2: 4K from start of device.
1412 switch(minor_version
) {
1414 sb_start
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1416 sb_start
&= ~(sector_t
)(4*2-1);
1427 rdev
->sb_start
= sb_start
;
1429 /* superblock is rarely larger than 1K, but it can be larger,
1430 * and it is safe to read 4k, so we do that
1432 ret
= read_disk_sb(rdev
, 4096);
1433 if (ret
) return ret
;
1436 sb
= page_address(rdev
->sb_page
);
1438 if (sb
->magic
!= cpu_to_le32(MD_SB_MAGIC
) ||
1439 sb
->major_version
!= cpu_to_le32(1) ||
1440 le32_to_cpu(sb
->max_dev
) > (4096-256)/2 ||
1441 le64_to_cpu(sb
->super_offset
) != rdev
->sb_start
||
1442 (le32_to_cpu(sb
->feature_map
) & ~MD_FEATURE_ALL
) != 0)
1445 if (calc_sb_1_csum(sb
) != sb
->sb_csum
) {
1446 printk("md: invalid superblock checksum on %s\n",
1447 bdevname(rdev
->bdev
,b
));
1450 if (le64_to_cpu(sb
->data_size
) < 10) {
1451 printk("md: data_size too small on %s\n",
1452 bdevname(rdev
->bdev
,b
));
1457 memcmp(sb
->pad3
, sb
->pad3
+1, sizeof(sb
->pad3
) - sizeof(sb
->pad3
[1])))
1458 /* Some padding is non-zero, might be a new feature */
1461 rdev
->preferred_minor
= 0xffff;
1462 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
1463 rdev
->new_data_offset
= rdev
->data_offset
;
1464 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
) &&
1465 (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_NEW_OFFSET
))
1466 rdev
->new_data_offset
+= (s32
)le32_to_cpu(sb
->new_offset
);
1467 atomic_set(&rdev
->corrected_errors
, le32_to_cpu(sb
->cnt_corrected_read
));
1469 rdev
->sb_size
= le32_to_cpu(sb
->max_dev
) * 2 + 256;
1470 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1471 if (rdev
->sb_size
& bmask
)
1472 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1475 && rdev
->data_offset
< sb_start
+ (rdev
->sb_size
/512))
1478 && rdev
->new_data_offset
< sb_start
+ (rdev
->sb_size
/512))
1481 if (sb
->level
== cpu_to_le32(LEVEL_MULTIPATH
))
1484 rdev
->desc_nr
= le32_to_cpu(sb
->dev_number
);
1486 if (!rdev
->bb_page
) {
1487 rdev
->bb_page
= alloc_page(GFP_KERNEL
);
1491 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BAD_BLOCKS
) &&
1492 rdev
->badblocks
.count
== 0) {
1493 /* need to load the bad block list.
1494 * Currently we limit it to one page.
1500 int sectors
= le16_to_cpu(sb
->bblog_size
);
1501 if (sectors
> (PAGE_SIZE
/ 512))
1503 offset
= le32_to_cpu(sb
->bblog_offset
);
1506 bb_sector
= (long long)offset
;
1507 if (!sync_page_io(rdev
, bb_sector
, sectors
<< 9,
1508 rdev
->bb_page
, READ
, true))
1510 bbp
= (u64
*)page_address(rdev
->bb_page
);
1511 rdev
->badblocks
.shift
= sb
->bblog_shift
;
1512 for (i
= 0 ; i
< (sectors
<< (9-3)) ; i
++, bbp
++) {
1513 u64 bb
= le64_to_cpu(*bbp
);
1514 int count
= bb
& (0x3ff);
1515 u64 sector
= bb
>> 10;
1516 sector
<<= sb
->bblog_shift
;
1517 count
<<= sb
->bblog_shift
;
1520 if (md_set_badblocks(&rdev
->badblocks
,
1521 sector
, count
, 1) == 0)
1524 } else if (sb
->bblog_offset
!= 0)
1525 rdev
->badblocks
.shift
= 0;
1531 struct mdp_superblock_1
*refsb
= page_address(refdev
->sb_page
);
1533 if (memcmp(sb
->set_uuid
, refsb
->set_uuid
, 16) != 0 ||
1534 sb
->level
!= refsb
->level
||
1535 sb
->layout
!= refsb
->layout
||
1536 sb
->chunksize
!= refsb
->chunksize
) {
1537 printk(KERN_WARNING
"md: %s has strangely different"
1538 " superblock to %s\n",
1539 bdevname(rdev
->bdev
,b
),
1540 bdevname(refdev
->bdev
,b2
));
1543 ev1
= le64_to_cpu(sb
->events
);
1544 ev2
= le64_to_cpu(refsb
->events
);
1551 if (minor_version
) {
1552 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9);
1553 sectors
-= rdev
->data_offset
;
1555 sectors
= rdev
->sb_start
;
1556 if (sectors
< le64_to_cpu(sb
->data_size
))
1558 rdev
->sectors
= le64_to_cpu(sb
->data_size
);
1562 static int super_1_validate(struct mddev
*mddev
, struct md_rdev
*rdev
)
1564 struct mdp_superblock_1
*sb
= page_address(rdev
->sb_page
);
1565 __u64 ev1
= le64_to_cpu(sb
->events
);
1567 rdev
->raid_disk
= -1;
1568 clear_bit(Faulty
, &rdev
->flags
);
1569 clear_bit(In_sync
, &rdev
->flags
);
1570 clear_bit(Bitmap_sync
, &rdev
->flags
);
1571 clear_bit(WriteMostly
, &rdev
->flags
);
1573 if (mddev
->raid_disks
== 0) {
1574 mddev
->major_version
= 1;
1575 mddev
->patch_version
= 0;
1576 mddev
->external
= 0;
1577 mddev
->chunk_sectors
= le32_to_cpu(sb
->chunksize
);
1578 mddev
->ctime
= le64_to_cpu(sb
->ctime
) & ((1ULL << 32)-1);
1579 mddev
->utime
= le64_to_cpu(sb
->utime
) & ((1ULL << 32)-1);
1580 mddev
->level
= le32_to_cpu(sb
->level
);
1581 mddev
->clevel
[0] = 0;
1582 mddev
->layout
= le32_to_cpu(sb
->layout
);
1583 mddev
->raid_disks
= le32_to_cpu(sb
->raid_disks
);
1584 mddev
->dev_sectors
= le64_to_cpu(sb
->size
);
1585 mddev
->events
= ev1
;
1586 mddev
->bitmap_info
.offset
= 0;
1587 mddev
->bitmap_info
.space
= 0;
1588 /* Default location for bitmap is 1K after superblock
1589 * using 3K - total of 4K
1591 mddev
->bitmap_info
.default_offset
= 1024 >> 9;
1592 mddev
->bitmap_info
.default_space
= (4096-1024) >> 9;
1593 mddev
->reshape_backwards
= 0;
1595 mddev
->recovery_cp
= le64_to_cpu(sb
->resync_offset
);
1596 memcpy(mddev
->uuid
, sb
->set_uuid
, 16);
1598 mddev
->max_disks
= (4096-256)/2;
1600 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_BITMAP_OFFSET
) &&
1601 mddev
->bitmap_info
.file
== NULL
) {
1602 mddev
->bitmap_info
.offset
=
1603 (__s32
)le32_to_cpu(sb
->bitmap_offset
);
1604 /* Metadata doesn't record how much space is available.
1605 * For 1.0, we assume we can use up to the superblock
1606 * if before, else to 4K beyond superblock.
1607 * For others, assume no change is possible.
1609 if (mddev
->minor_version
> 0)
1610 mddev
->bitmap_info
.space
= 0;
1611 else if (mddev
->bitmap_info
.offset
> 0)
1612 mddev
->bitmap_info
.space
=
1613 8 - mddev
->bitmap_info
.offset
;
1615 mddev
->bitmap_info
.space
=
1616 -mddev
->bitmap_info
.offset
;
1619 if ((le32_to_cpu(sb
->feature_map
) & MD_FEATURE_RESHAPE_ACTIVE
)) {
1620 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
1621 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
1622 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
1623 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
1624 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_chunk
);
1625 if (mddev
->delta_disks
< 0 ||
1626 (mddev
->delta_disks
== 0 &&
1627 (le32_to_cpu(sb
->feature_map
)
1628 & MD_FEATURE_RESHAPE_BACKWARDS
)))
1629 mddev
->reshape_backwards
= 1;
1631 mddev
->reshape_position
= MaxSector
;
1632 mddev
->delta_disks
= 0;
1633 mddev
->new_level
= mddev
->level
;
1634 mddev
->new_layout
= mddev
->layout
;
1635 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
1638 } else if (mddev
->pers
== NULL
) {
1639 /* Insist of good event counter while assembling, except for
1640 * spares (which don't need an event count) */
1642 if (rdev
->desc_nr
>= 0 &&
1643 rdev
->desc_nr
< le32_to_cpu(sb
->max_dev
) &&
1644 le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]) < 0xfffe)
1645 if (ev1
< mddev
->events
)
1647 } else if (mddev
->bitmap
) {
1648 /* If adding to array with a bitmap, then we can accept an
1649 * older device, but not too old.
1651 if (ev1
< mddev
->bitmap
->events_cleared
)
1653 if (ev1
< mddev
->events
)
1654 set_bit(Bitmap_sync
, &rdev
->flags
);
1656 if (ev1
< mddev
->events
)
1657 /* just a hot-add of a new device, leave raid_disk at -1 */
1660 if (mddev
->level
!= LEVEL_MULTIPATH
) {
1662 if (rdev
->desc_nr
< 0 ||
1663 rdev
->desc_nr
>= le32_to_cpu(sb
->max_dev
)) {
1667 role
= le16_to_cpu(sb
->dev_roles
[rdev
->desc_nr
]);
1669 case 0xffff: /* spare */
1671 case 0xfffe: /* faulty */
1672 set_bit(Faulty
, &rdev
->flags
);
1675 rdev
->saved_raid_disk
= role
;
1676 if ((le32_to_cpu(sb
->feature_map
) &
1677 MD_FEATURE_RECOVERY_OFFSET
)) {
1678 rdev
->recovery_offset
= le64_to_cpu(sb
->recovery_offset
);
1679 if (!(le32_to_cpu(sb
->feature_map
) &
1680 MD_FEATURE_RECOVERY_BITMAP
))
1681 rdev
->saved_raid_disk
= -1;
1683 set_bit(In_sync
, &rdev
->flags
);
1684 rdev
->raid_disk
= role
;
1687 if (sb
->devflags
& WriteMostly1
)
1688 set_bit(WriteMostly
, &rdev
->flags
);
1689 if (le32_to_cpu(sb
->feature_map
) & MD_FEATURE_REPLACEMENT
)
1690 set_bit(Replacement
, &rdev
->flags
);
1691 } else /* MULTIPATH are always insync */
1692 set_bit(In_sync
, &rdev
->flags
);
1697 static void super_1_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1699 struct mdp_superblock_1
*sb
;
1700 struct md_rdev
*rdev2
;
1702 /* make rdev->sb match mddev and rdev data. */
1704 sb
= page_address(rdev
->sb_page
);
1706 sb
->feature_map
= 0;
1708 sb
->recovery_offset
= cpu_to_le64(0);
1709 memset(sb
->pad3
, 0, sizeof(sb
->pad3
));
1711 sb
->utime
= cpu_to_le64((__u64
)mddev
->utime
);
1712 sb
->events
= cpu_to_le64(mddev
->events
);
1714 sb
->resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1716 sb
->resync_offset
= cpu_to_le64(0);
1718 sb
->cnt_corrected_read
= cpu_to_le32(atomic_read(&rdev
->corrected_errors
));
1720 sb
->raid_disks
= cpu_to_le32(mddev
->raid_disks
);
1721 sb
->size
= cpu_to_le64(mddev
->dev_sectors
);
1722 sb
->chunksize
= cpu_to_le32(mddev
->chunk_sectors
);
1723 sb
->level
= cpu_to_le32(mddev
->level
);
1724 sb
->layout
= cpu_to_le32(mddev
->layout
);
1726 if (test_bit(WriteMostly
, &rdev
->flags
))
1727 sb
->devflags
|= WriteMostly1
;
1729 sb
->devflags
&= ~WriteMostly1
;
1730 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1731 sb
->data_size
= cpu_to_le64(rdev
->sectors
);
1733 if (mddev
->bitmap
&& mddev
->bitmap_info
.file
== NULL
) {
1734 sb
->bitmap_offset
= cpu_to_le32((__u32
)mddev
->bitmap_info
.offset
);
1735 sb
->feature_map
= cpu_to_le32(MD_FEATURE_BITMAP_OFFSET
);
1738 if (rdev
->raid_disk
>= 0 &&
1739 !test_bit(In_sync
, &rdev
->flags
)) {
1741 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET
);
1742 sb
->recovery_offset
=
1743 cpu_to_le64(rdev
->recovery_offset
);
1744 if (rdev
->saved_raid_disk
>= 0 && mddev
->bitmap
)
1746 cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP
);
1748 if (test_bit(Replacement
, &rdev
->flags
))
1750 cpu_to_le32(MD_FEATURE_REPLACEMENT
);
1752 if (mddev
->reshape_position
!= MaxSector
) {
1753 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE
);
1754 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1755 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1756 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1757 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1758 sb
->new_chunk
= cpu_to_le32(mddev
->new_chunk_sectors
);
1759 if (mddev
->delta_disks
== 0 &&
1760 mddev
->reshape_backwards
)
1762 |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS
);
1763 if (rdev
->new_data_offset
!= rdev
->data_offset
) {
1765 |= cpu_to_le32(MD_FEATURE_NEW_OFFSET
);
1766 sb
->new_offset
= cpu_to_le32((__u32
)(rdev
->new_data_offset
1767 - rdev
->data_offset
));
1771 if (rdev
->badblocks
.count
== 0)
1772 /* Nothing to do for bad blocks*/ ;
1773 else if (sb
->bblog_offset
== 0)
1774 /* Cannot record bad blocks on this device */
1775 md_error(mddev
, rdev
);
1777 struct badblocks
*bb
= &rdev
->badblocks
;
1778 u64
*bbp
= (u64
*)page_address(rdev
->bb_page
);
1780 sb
->feature_map
|= cpu_to_le32(MD_FEATURE_BAD_BLOCKS
);
1785 seq
= read_seqbegin(&bb
->lock
);
1787 memset(bbp
, 0xff, PAGE_SIZE
);
1789 for (i
= 0 ; i
< bb
->count
; i
++) {
1790 u64 internal_bb
= p
[i
];
1791 u64 store_bb
= ((BB_OFFSET(internal_bb
) << 10)
1792 | BB_LEN(internal_bb
));
1793 bbp
[i
] = cpu_to_le64(store_bb
);
1796 if (read_seqretry(&bb
->lock
, seq
))
1799 bb
->sector
= (rdev
->sb_start
+
1800 (int)le32_to_cpu(sb
->bblog_offset
));
1801 bb
->size
= le16_to_cpu(sb
->bblog_size
);
1806 rdev_for_each(rdev2
, mddev
)
1807 if (rdev2
->desc_nr
+1 > max_dev
)
1808 max_dev
= rdev2
->desc_nr
+1;
1810 if (max_dev
> le32_to_cpu(sb
->max_dev
)) {
1812 sb
->max_dev
= cpu_to_le32(max_dev
);
1813 rdev
->sb_size
= max_dev
* 2 + 256;
1814 bmask
= queue_logical_block_size(rdev
->bdev
->bd_disk
->queue
)-1;
1815 if (rdev
->sb_size
& bmask
)
1816 rdev
->sb_size
= (rdev
->sb_size
| bmask
) + 1;
1818 max_dev
= le32_to_cpu(sb
->max_dev
);
1820 for (i
=0; i
<max_dev
;i
++)
1821 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1823 rdev_for_each(rdev2
, mddev
) {
1825 if (test_bit(Faulty
, &rdev2
->flags
))
1826 sb
->dev_roles
[i
] = cpu_to_le16(0xfffe);
1827 else if (test_bit(In_sync
, &rdev2
->flags
))
1828 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1829 else if (rdev2
->raid_disk
>= 0)
1830 sb
->dev_roles
[i
] = cpu_to_le16(rdev2
->raid_disk
);
1832 sb
->dev_roles
[i
] = cpu_to_le16(0xffff);
1835 sb
->sb_csum
= calc_sb_1_csum(sb
);
1838 static unsigned long long
1839 super_1_rdev_size_change(struct md_rdev
*rdev
, sector_t num_sectors
)
1841 struct mdp_superblock_1
*sb
;
1842 sector_t max_sectors
;
1843 if (num_sectors
&& num_sectors
< rdev
->mddev
->dev_sectors
)
1844 return 0; /* component must fit device */
1845 if (rdev
->data_offset
!= rdev
->new_data_offset
)
1846 return 0; /* too confusing */
1847 if (rdev
->sb_start
< rdev
->data_offset
) {
1848 /* minor versions 1 and 2; superblock before data */
1849 max_sectors
= i_size_read(rdev
->bdev
->bd_inode
) >> 9;
1850 max_sectors
-= rdev
->data_offset
;
1851 if (!num_sectors
|| num_sectors
> max_sectors
)
1852 num_sectors
= max_sectors
;
1853 } else if (rdev
->mddev
->bitmap_info
.offset
) {
1854 /* minor version 0 with bitmap we can't move */
1857 /* minor version 0; superblock after data */
1859 sb_start
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) - 8*2;
1860 sb_start
&= ~(sector_t
)(4*2 - 1);
1861 max_sectors
= rdev
->sectors
+ sb_start
- rdev
->sb_start
;
1862 if (!num_sectors
|| num_sectors
> max_sectors
)
1863 num_sectors
= max_sectors
;
1864 rdev
->sb_start
= sb_start
;
1866 sb
= page_address(rdev
->sb_page
);
1867 sb
->data_size
= cpu_to_le64(num_sectors
);
1868 sb
->super_offset
= rdev
->sb_start
;
1869 sb
->sb_csum
= calc_sb_1_csum(sb
);
1870 md_super_write(rdev
->mddev
, rdev
, rdev
->sb_start
, rdev
->sb_size
,
1872 md_super_wait(rdev
->mddev
);
1878 super_1_allow_new_offset(struct md_rdev
*rdev
,
1879 unsigned long long new_offset
)
1881 /* All necessary checks on new >= old have been done */
1882 struct bitmap
*bitmap
;
1883 if (new_offset
>= rdev
->data_offset
)
1886 /* with 1.0 metadata, there is no metadata to tread on
1887 * so we can always move back */
1888 if (rdev
->mddev
->minor_version
== 0)
1891 /* otherwise we must be sure not to step on
1892 * any metadata, so stay:
1893 * 36K beyond start of superblock
1894 * beyond end of badblocks
1895 * beyond write-intent bitmap
1897 if (rdev
->sb_start
+ (32+4)*2 > new_offset
)
1899 bitmap
= rdev
->mddev
->bitmap
;
1900 if (bitmap
&& !rdev
->mddev
->bitmap_info
.file
&&
1901 rdev
->sb_start
+ rdev
->mddev
->bitmap_info
.offset
+
1902 bitmap
->storage
.file_pages
* (PAGE_SIZE
>>9) > new_offset
)
1904 if (rdev
->badblocks
.sector
+ rdev
->badblocks
.size
> new_offset
)
1910 static struct super_type super_types
[] = {
1913 .owner
= THIS_MODULE
,
1914 .load_super
= super_90_load
,
1915 .validate_super
= super_90_validate
,
1916 .sync_super
= super_90_sync
,
1917 .rdev_size_change
= super_90_rdev_size_change
,
1918 .allow_new_offset
= super_90_allow_new_offset
,
1922 .owner
= THIS_MODULE
,
1923 .load_super
= super_1_load
,
1924 .validate_super
= super_1_validate
,
1925 .sync_super
= super_1_sync
,
1926 .rdev_size_change
= super_1_rdev_size_change
,
1927 .allow_new_offset
= super_1_allow_new_offset
,
1931 static void sync_super(struct mddev
*mddev
, struct md_rdev
*rdev
)
1933 if (mddev
->sync_super
) {
1934 mddev
->sync_super(mddev
, rdev
);
1938 BUG_ON(mddev
->major_version
>= ARRAY_SIZE(super_types
));
1940 super_types
[mddev
->major_version
].sync_super(mddev
, rdev
);
1943 static int match_mddev_units(struct mddev
*mddev1
, struct mddev
*mddev2
)
1945 struct md_rdev
*rdev
, *rdev2
;
1948 rdev_for_each_rcu(rdev
, mddev1
)
1949 rdev_for_each_rcu(rdev2
, mddev2
)
1950 if (rdev
->bdev
->bd_contains
==
1951 rdev2
->bdev
->bd_contains
) {
1959 static LIST_HEAD(pending_raid_disks
);
1962 * Try to register data integrity profile for an mddev
1964 * This is called when an array is started and after a disk has been kicked
1965 * from the array. It only succeeds if all working and active component devices
1966 * are integrity capable with matching profiles.
1968 int md_integrity_register(struct mddev
*mddev
)
1970 struct md_rdev
*rdev
, *reference
= NULL
;
1972 if (list_empty(&mddev
->disks
))
1973 return 0; /* nothing to do */
1974 if (!mddev
->gendisk
|| blk_get_integrity(mddev
->gendisk
))
1975 return 0; /* shouldn't register, or already is */
1976 rdev_for_each(rdev
, mddev
) {
1977 /* skip spares and non-functional disks */
1978 if (test_bit(Faulty
, &rdev
->flags
))
1980 if (rdev
->raid_disk
< 0)
1983 /* Use the first rdev as the reference */
1987 /* does this rdev's profile match the reference profile? */
1988 if (blk_integrity_compare(reference
->bdev
->bd_disk
,
1989 rdev
->bdev
->bd_disk
) < 0)
1992 if (!reference
|| !bdev_get_integrity(reference
->bdev
))
1995 * All component devices are integrity capable and have matching
1996 * profiles, register the common profile for the md device.
1998 if (blk_integrity_register(mddev
->gendisk
,
1999 bdev_get_integrity(reference
->bdev
)) != 0) {
2000 printk(KERN_ERR
"md: failed to register integrity for %s\n",
2004 printk(KERN_NOTICE
"md: data integrity enabled on %s\n", mdname(mddev
));
2005 if (bioset_integrity_create(mddev
->bio_set
, BIO_POOL_SIZE
)) {
2006 printk(KERN_ERR
"md: failed to create integrity pool for %s\n",
2012 EXPORT_SYMBOL(md_integrity_register
);
2014 /* Disable data integrity if non-capable/non-matching disk is being added */
2015 void md_integrity_add_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
2017 struct blk_integrity
*bi_rdev
;
2018 struct blk_integrity
*bi_mddev
;
2020 if (!mddev
->gendisk
)
2023 bi_rdev
= bdev_get_integrity(rdev
->bdev
);
2024 bi_mddev
= blk_get_integrity(mddev
->gendisk
);
2026 if (!bi_mddev
) /* nothing to do */
2028 if (rdev
->raid_disk
< 0) /* skip spares */
2030 if (bi_rdev
&& blk_integrity_compare(mddev
->gendisk
,
2031 rdev
->bdev
->bd_disk
) >= 0)
2033 printk(KERN_NOTICE
"disabling data integrity on %s\n", mdname(mddev
));
2034 blk_integrity_unregister(mddev
->gendisk
);
2036 EXPORT_SYMBOL(md_integrity_add_rdev
);
2038 static int bind_rdev_to_array(struct md_rdev
* rdev
, struct mddev
* mddev
)
2040 char b
[BDEVNAME_SIZE
];
2050 /* prevent duplicates */
2051 if (find_rdev(mddev
, rdev
->bdev
->bd_dev
))
2054 /* make sure rdev->sectors exceeds mddev->dev_sectors */
2055 if (rdev
->sectors
&& (mddev
->dev_sectors
== 0 ||
2056 rdev
->sectors
< mddev
->dev_sectors
)) {
2058 /* Cannot change size, so fail
2059 * If mddev->level <= 0, then we don't care
2060 * about aligning sizes (e.g. linear)
2062 if (mddev
->level
> 0)
2065 mddev
->dev_sectors
= rdev
->sectors
;
2068 /* Verify rdev->desc_nr is unique.
2069 * If it is -1, assign a free number, else
2070 * check number is not in use
2072 if (rdev
->desc_nr
< 0) {
2074 if (mddev
->pers
) choice
= mddev
->raid_disks
;
2075 while (find_rdev_nr(mddev
, choice
))
2077 rdev
->desc_nr
= choice
;
2079 if (find_rdev_nr(mddev
, rdev
->desc_nr
))
2082 if (mddev
->max_disks
&& rdev
->desc_nr
>= mddev
->max_disks
) {
2083 printk(KERN_WARNING
"md: %s: array is limited to %d devices\n",
2084 mdname(mddev
), mddev
->max_disks
);
2087 bdevname(rdev
->bdev
,b
);
2088 while ( (s
=strchr(b
, '/')) != NULL
)
2091 rdev
->mddev
= mddev
;
2092 printk(KERN_INFO
"md: bind<%s>\n", b
);
2094 if ((err
= kobject_add(&rdev
->kobj
, &mddev
->kobj
, "dev-%s", b
)))
2097 ko
= &part_to_dev(rdev
->bdev
->bd_part
)->kobj
;
2098 if (sysfs_create_link(&rdev
->kobj
, ko
, "block"))
2099 /* failure here is OK */;
2100 rdev
->sysfs_state
= sysfs_get_dirent_safe(rdev
->kobj
.sd
, "state");
2102 list_add_rcu(&rdev
->same_set
, &mddev
->disks
);
2103 bd_link_disk_holder(rdev
->bdev
, mddev
->gendisk
);
2105 /* May as well allow recovery to be retried once */
2106 mddev
->recovery_disabled
++;
2111 printk(KERN_WARNING
"md: failed to register dev-%s for %s\n",
2116 static void md_delayed_delete(struct work_struct
*ws
)
2118 struct md_rdev
*rdev
= container_of(ws
, struct md_rdev
, del_work
);
2119 kobject_del(&rdev
->kobj
);
2120 kobject_put(&rdev
->kobj
);
2123 static void unbind_rdev_from_array(struct md_rdev
* rdev
)
2125 char b
[BDEVNAME_SIZE
];
2130 bd_unlink_disk_holder(rdev
->bdev
, rdev
->mddev
->gendisk
);
2131 list_del_rcu(&rdev
->same_set
);
2132 printk(KERN_INFO
"md: unbind<%s>\n", bdevname(rdev
->bdev
,b
));
2134 sysfs_remove_link(&rdev
->kobj
, "block");
2135 sysfs_put(rdev
->sysfs_state
);
2136 rdev
->sysfs_state
= NULL
;
2137 rdev
->badblocks
.count
= 0;
2138 /* We need to delay this, otherwise we can deadlock when
2139 * writing to 'remove' to "dev/state". We also need
2140 * to delay it due to rcu usage.
2143 INIT_WORK(&rdev
->del_work
, md_delayed_delete
);
2144 kobject_get(&rdev
->kobj
);
2145 queue_work(md_misc_wq
, &rdev
->del_work
);
2149 * prevent the device from being mounted, repartitioned or
2150 * otherwise reused by a RAID array (or any other kernel
2151 * subsystem), by bd_claiming the device.
2153 static int lock_rdev(struct md_rdev
*rdev
, dev_t dev
, int shared
)
2156 struct block_device
*bdev
;
2157 char b
[BDEVNAME_SIZE
];
2159 bdev
= blkdev_get_by_dev(dev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
,
2160 shared
? (struct md_rdev
*)lock_rdev
: rdev
);
2162 printk(KERN_ERR
"md: could not open %s.\n",
2163 __bdevname(dev
, b
));
2164 return PTR_ERR(bdev
);
2170 static void unlock_rdev(struct md_rdev
*rdev
)
2172 struct block_device
*bdev
= rdev
->bdev
;
2176 blkdev_put(bdev
, FMODE_READ
|FMODE_WRITE
|FMODE_EXCL
);
2179 void md_autodetect_dev(dev_t dev
);
2181 static void export_rdev(struct md_rdev
* rdev
)
2183 char b
[BDEVNAME_SIZE
];
2184 printk(KERN_INFO
"md: export_rdev(%s)\n",
2185 bdevname(rdev
->bdev
,b
));
2188 md_rdev_clear(rdev
);
2190 if (test_bit(AutoDetected
, &rdev
->flags
))
2191 md_autodetect_dev(rdev
->bdev
->bd_dev
);
2194 kobject_put(&rdev
->kobj
);
2197 static void kick_rdev_from_array(struct md_rdev
* rdev
)
2199 unbind_rdev_from_array(rdev
);
2203 static void export_array(struct mddev
*mddev
)
2205 struct md_rdev
*rdev
, *tmp
;
2207 rdev_for_each_safe(rdev
, tmp
, mddev
) {
2212 kick_rdev_from_array(rdev
);
2214 if (!list_empty(&mddev
->disks
))
2216 mddev
->raid_disks
= 0;
2217 mddev
->major_version
= 0;
2220 static void print_desc(mdp_disk_t
*desc
)
2222 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc
->number
,
2223 desc
->major
,desc
->minor
,desc
->raid_disk
,desc
->state
);
2226 static void print_sb_90(mdp_super_t
*sb
)
2231 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
2232 sb
->major_version
, sb
->minor_version
, sb
->patch_version
,
2233 sb
->set_uuid0
, sb
->set_uuid1
, sb
->set_uuid2
, sb
->set_uuid3
,
2235 printk(KERN_INFO
"md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
2236 sb
->level
, sb
->size
, sb
->nr_disks
, sb
->raid_disks
,
2237 sb
->md_minor
, sb
->layout
, sb
->chunk_size
);
2238 printk(KERN_INFO
"md: UT:%08x ST:%d AD:%d WD:%d"
2239 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
2240 sb
->utime
, sb
->state
, sb
->active_disks
, sb
->working_disks
,
2241 sb
->failed_disks
, sb
->spare_disks
,
2242 sb
->sb_csum
, (unsigned long)sb
->events_lo
);
2245 for (i
= 0; i
< MD_SB_DISKS
; i
++) {
2248 desc
= sb
->disks
+ i
;
2249 if (desc
->number
|| desc
->major
|| desc
->minor
||
2250 desc
->raid_disk
|| (desc
->state
&& (desc
->state
!= 4))) {
2251 printk(" D %2d: ", i
);
2255 printk(KERN_INFO
"md: THIS: ");
2256 print_desc(&sb
->this_disk
);
2259 static void print_sb_1(struct mdp_superblock_1
*sb
)
2263 uuid
= sb
->set_uuid
;
2265 "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n"
2266 "md: Name: \"%s\" CT:%llu\n",
2267 le32_to_cpu(sb
->major_version
),
2268 le32_to_cpu(sb
->feature_map
),
2271 (unsigned long long)le64_to_cpu(sb
->ctime
)
2272 & MD_SUPERBLOCK_1_TIME_SEC_MASK
);
2274 uuid
= sb
->device_uuid
;
2276 "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
2278 "md: Dev:%08x UUID: %pU\n"
2279 "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
2280 "md: (MaxDev:%u) \n",
2281 le32_to_cpu(sb
->level
),
2282 (unsigned long long)le64_to_cpu(sb
->size
),
2283 le32_to_cpu(sb
->raid_disks
),
2284 le32_to_cpu(sb
->layout
),
2285 le32_to_cpu(sb
->chunksize
),
2286 (unsigned long long)le64_to_cpu(sb
->data_offset
),
2287 (unsigned long long)le64_to_cpu(sb
->data_size
),
2288 (unsigned long long)le64_to_cpu(sb
->super_offset
),
2289 (unsigned long long)le64_to_cpu(sb
->recovery_offset
),
2290 le32_to_cpu(sb
->dev_number
),
2293 (unsigned long long)le64_to_cpu(sb
->utime
) & MD_SUPERBLOCK_1_TIME_SEC_MASK
,
2294 (unsigned long long)le64_to_cpu(sb
->events
),
2295 (unsigned long long)le64_to_cpu(sb
->resync_offset
),
2296 le32_to_cpu(sb
->sb_csum
),
2297 le32_to_cpu(sb
->max_dev
)
2301 static void print_rdev(struct md_rdev
*rdev
, int major_version
)
2303 char b
[BDEVNAME_SIZE
];
2304 printk(KERN_INFO
"md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
2305 bdevname(rdev
->bdev
, b
), (unsigned long long)rdev
->sectors
,
2306 test_bit(Faulty
, &rdev
->flags
), test_bit(In_sync
, &rdev
->flags
),
2308 if (rdev
->sb_loaded
) {
2309 printk(KERN_INFO
"md: rdev superblock (MJ:%d):\n", major_version
);
2310 switch (major_version
) {
2312 print_sb_90(page_address(rdev
->sb_page
));
2315 print_sb_1(page_address(rdev
->sb_page
));
2319 printk(KERN_INFO
"md: no rdev superblock!\n");
2322 static void md_print_devices(void)
2324 struct list_head
*tmp
;
2325 struct md_rdev
*rdev
;
2326 struct mddev
*mddev
;
2327 char b
[BDEVNAME_SIZE
];
2330 printk("md: **********************************\n");
2331 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
2332 printk("md: **********************************\n");
2333 for_each_mddev(mddev
, tmp
) {
2336 bitmap_print_sb(mddev
->bitmap
);
2338 printk("%s: ", mdname(mddev
));
2339 rdev_for_each(rdev
, mddev
)
2340 printk("<%s>", bdevname(rdev
->bdev
,b
));
2343 rdev_for_each(rdev
, mddev
)
2344 print_rdev(rdev
, mddev
->major_version
);
2346 printk("md: **********************************\n");
2351 static void sync_sbs(struct mddev
* mddev
, int nospares
)
2353 /* Update each superblock (in-memory image), but
2354 * if we are allowed to, skip spares which already
2355 * have the right event counter, or have one earlier
2356 * (which would mean they aren't being marked as dirty
2357 * with the rest of the array)
2359 struct md_rdev
*rdev
;
2360 rdev_for_each(rdev
, mddev
) {
2361 if (rdev
->sb_events
== mddev
->events
||
2363 rdev
->raid_disk
< 0 &&
2364 rdev
->sb_events
+1 == mddev
->events
)) {
2365 /* Don't update this superblock */
2366 rdev
->sb_loaded
= 2;
2368 sync_super(mddev
, rdev
);
2369 rdev
->sb_loaded
= 1;
2374 static void md_update_sb(struct mddev
* mddev
, int force_change
)
2376 struct md_rdev
*rdev
;
2379 int any_badblocks_changed
= 0;
2383 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2387 /* First make sure individual recovery_offsets are correct */
2388 rdev_for_each(rdev
, mddev
) {
2389 if (rdev
->raid_disk
>= 0 &&
2390 mddev
->delta_disks
>= 0 &&
2391 !test_bit(In_sync
, &rdev
->flags
) &&
2392 mddev
->curr_resync_completed
> rdev
->recovery_offset
)
2393 rdev
->recovery_offset
= mddev
->curr_resync_completed
;
2396 if (!mddev
->persistent
) {
2397 clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
2398 clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
2399 if (!mddev
->external
) {
2400 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2401 rdev_for_each(rdev
, mddev
) {
2402 if (rdev
->badblocks
.changed
) {
2403 rdev
->badblocks
.changed
= 0;
2404 md_ack_all_badblocks(&rdev
->badblocks
);
2405 md_error(mddev
, rdev
);
2407 clear_bit(Blocked
, &rdev
->flags
);
2408 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2409 wake_up(&rdev
->blocked_wait
);
2412 wake_up(&mddev
->sb_wait
);
2416 spin_lock_irq(&mddev
->write_lock
);
2418 mddev
->utime
= get_seconds();
2420 if (test_and_clear_bit(MD_CHANGE_DEVS
, &mddev
->flags
))
2422 if (test_and_clear_bit(MD_CHANGE_CLEAN
, &mddev
->flags
))
2423 /* just a clean<-> dirty transition, possibly leave spares alone,
2424 * though if events isn't the right even/odd, we will have to do
2430 if (mddev
->degraded
)
2431 /* If the array is degraded, then skipping spares is both
2432 * dangerous and fairly pointless.
2433 * Dangerous because a device that was removed from the array
2434 * might have a event_count that still looks up-to-date,
2435 * so it can be re-added without a resync.
2436 * Pointless because if there are any spares to skip,
2437 * then a recovery will happen and soon that array won't
2438 * be degraded any more and the spare can go back to sleep then.
2442 sync_req
= mddev
->in_sync
;
2444 /* If this is just a dirty<->clean transition, and the array is clean
2445 * and 'events' is odd, we can roll back to the previous clean state */
2447 && (mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
2448 && mddev
->can_decrease_events
2449 && mddev
->events
!= 1) {
2451 mddev
->can_decrease_events
= 0;
2453 /* otherwise we have to go forward and ... */
2455 mddev
->can_decrease_events
= nospares
;
2458 if (!mddev
->events
) {
2460 * oops, this 64-bit counter should never wrap.
2461 * Either we are in around ~1 trillion A.C., assuming
2462 * 1 reboot per second, or we have a bug:
2468 rdev_for_each(rdev
, mddev
) {
2469 if (rdev
->badblocks
.changed
)
2470 any_badblocks_changed
++;
2471 if (test_bit(Faulty
, &rdev
->flags
))
2472 set_bit(FaultRecorded
, &rdev
->flags
);
2475 sync_sbs(mddev
, nospares
);
2476 spin_unlock_irq(&mddev
->write_lock
);
2478 pr_debug("md: updating %s RAID superblock on device (in sync %d)\n",
2479 mdname(mddev
), mddev
->in_sync
);
2481 bitmap_update_sb(mddev
->bitmap
);
2482 rdev_for_each(rdev
, mddev
) {
2483 char b
[BDEVNAME_SIZE
];
2485 if (rdev
->sb_loaded
!= 1)
2486 continue; /* no noise on spare devices */
2488 if (!test_bit(Faulty
, &rdev
->flags
)) {
2489 md_super_write(mddev
,rdev
,
2490 rdev
->sb_start
, rdev
->sb_size
,
2492 pr_debug("md: (write) %s's sb offset: %llu\n",
2493 bdevname(rdev
->bdev
, b
),
2494 (unsigned long long)rdev
->sb_start
);
2495 rdev
->sb_events
= mddev
->events
;
2496 if (rdev
->badblocks
.size
) {
2497 md_super_write(mddev
, rdev
,
2498 rdev
->badblocks
.sector
,
2499 rdev
->badblocks
.size
<< 9,
2501 rdev
->badblocks
.size
= 0;
2505 pr_debug("md: %s (skipping faulty)\n",
2506 bdevname(rdev
->bdev
, b
));
2508 if (mddev
->level
== LEVEL_MULTIPATH
)
2509 /* only need to write one superblock... */
2512 md_super_wait(mddev
);
2513 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2515 spin_lock_irq(&mddev
->write_lock
);
2516 if (mddev
->in_sync
!= sync_req
||
2517 test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
2518 /* have to write it out again */
2519 spin_unlock_irq(&mddev
->write_lock
);
2522 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
2523 spin_unlock_irq(&mddev
->write_lock
);
2524 wake_up(&mddev
->sb_wait
);
2525 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
2526 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
2528 rdev_for_each(rdev
, mddev
) {
2529 if (test_and_clear_bit(FaultRecorded
, &rdev
->flags
))
2530 clear_bit(Blocked
, &rdev
->flags
);
2532 if (any_badblocks_changed
)
2533 md_ack_all_badblocks(&rdev
->badblocks
);
2534 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2535 wake_up(&rdev
->blocked_wait
);
2539 /* words written to sysfs files may, or may not, be \n terminated.
2540 * We want to accept with case. For this we use cmd_match.
2542 static int cmd_match(const char *cmd
, const char *str
)
2544 /* See if cmd, written into a sysfs file, matches
2545 * str. They must either be the same, or cmd can
2546 * have a trailing newline
2548 while (*cmd
&& *str
&& *cmd
== *str
) {
2559 struct rdev_sysfs_entry
{
2560 struct attribute attr
;
2561 ssize_t (*show
)(struct md_rdev
*, char *);
2562 ssize_t (*store
)(struct md_rdev
*, const char *, size_t);
2566 state_show(struct md_rdev
*rdev
, char *page
)
2571 if (test_bit(Faulty
, &rdev
->flags
) ||
2572 rdev
->badblocks
.unacked_exist
) {
2573 len
+= sprintf(page
+len
, "%sfaulty",sep
);
2576 if (test_bit(In_sync
, &rdev
->flags
)) {
2577 len
+= sprintf(page
+len
, "%sin_sync",sep
);
2580 if (test_bit(WriteMostly
, &rdev
->flags
)) {
2581 len
+= sprintf(page
+len
, "%swrite_mostly",sep
);
2584 if (test_bit(Blocked
, &rdev
->flags
) ||
2585 (rdev
->badblocks
.unacked_exist
2586 && !test_bit(Faulty
, &rdev
->flags
))) {
2587 len
+= sprintf(page
+len
, "%sblocked", sep
);
2590 if (!test_bit(Faulty
, &rdev
->flags
) &&
2591 !test_bit(In_sync
, &rdev
->flags
)) {
2592 len
+= sprintf(page
+len
, "%sspare", sep
);
2595 if (test_bit(WriteErrorSeen
, &rdev
->flags
)) {
2596 len
+= sprintf(page
+len
, "%swrite_error", sep
);
2599 if (test_bit(WantReplacement
, &rdev
->flags
)) {
2600 len
+= sprintf(page
+len
, "%swant_replacement", sep
);
2603 if (test_bit(Replacement
, &rdev
->flags
)) {
2604 len
+= sprintf(page
+len
, "%sreplacement", sep
);
2608 return len
+sprintf(page
+len
, "\n");
2612 state_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2615 * faulty - simulates an error
2616 * remove - disconnects the device
2617 * writemostly - sets write_mostly
2618 * -writemostly - clears write_mostly
2619 * blocked - sets the Blocked flags
2620 * -blocked - clears the Blocked and possibly simulates an error
2621 * insync - sets Insync providing device isn't active
2622 * -insync - clear Insync for a device with a slot assigned,
2623 * so that it gets rebuilt based on bitmap
2624 * write_error - sets WriteErrorSeen
2625 * -write_error - clears WriteErrorSeen
2628 if (cmd_match(buf
, "faulty") && rdev
->mddev
->pers
) {
2629 md_error(rdev
->mddev
, rdev
);
2630 if (test_bit(Faulty
, &rdev
->flags
))
2634 } else if (cmd_match(buf
, "remove")) {
2635 if (rdev
->raid_disk
>= 0)
2638 struct mddev
*mddev
= rdev
->mddev
;
2639 kick_rdev_from_array(rdev
);
2641 md_update_sb(mddev
, 1);
2642 md_new_event(mddev
);
2645 } else if (cmd_match(buf
, "writemostly")) {
2646 set_bit(WriteMostly
, &rdev
->flags
);
2648 } else if (cmd_match(buf
, "-writemostly")) {
2649 clear_bit(WriteMostly
, &rdev
->flags
);
2651 } else if (cmd_match(buf
, "blocked")) {
2652 set_bit(Blocked
, &rdev
->flags
);
2654 } else if (cmd_match(buf
, "-blocked")) {
2655 if (!test_bit(Faulty
, &rdev
->flags
) &&
2656 rdev
->badblocks
.unacked_exist
) {
2657 /* metadata handler doesn't understand badblocks,
2658 * so we need to fail the device
2660 md_error(rdev
->mddev
, rdev
);
2662 clear_bit(Blocked
, &rdev
->flags
);
2663 clear_bit(BlockedBadBlocks
, &rdev
->flags
);
2664 wake_up(&rdev
->blocked_wait
);
2665 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2666 md_wakeup_thread(rdev
->mddev
->thread
);
2669 } else if (cmd_match(buf
, "insync") && rdev
->raid_disk
== -1) {
2670 set_bit(In_sync
, &rdev
->flags
);
2672 } else if (cmd_match(buf
, "-insync") && rdev
->raid_disk
>= 0) {
2673 clear_bit(In_sync
, &rdev
->flags
);
2674 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2675 rdev
->raid_disk
= -1;
2677 } else if (cmd_match(buf
, "write_error")) {
2678 set_bit(WriteErrorSeen
, &rdev
->flags
);
2680 } else if (cmd_match(buf
, "-write_error")) {
2681 clear_bit(WriteErrorSeen
, &rdev
->flags
);
2683 } else if (cmd_match(buf
, "want_replacement")) {
2684 /* Any non-spare device that is not a replacement can
2685 * become want_replacement at any time, but we then need to
2686 * check if recovery is needed.
2688 if (rdev
->raid_disk
>= 0 &&
2689 !test_bit(Replacement
, &rdev
->flags
))
2690 set_bit(WantReplacement
, &rdev
->flags
);
2691 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2692 md_wakeup_thread(rdev
->mddev
->thread
);
2694 } else if (cmd_match(buf
, "-want_replacement")) {
2695 /* Clearing 'want_replacement' is always allowed.
2696 * Once replacements starts it is too late though.
2699 clear_bit(WantReplacement
, &rdev
->flags
);
2700 } else if (cmd_match(buf
, "replacement")) {
2701 /* Can only set a device as a replacement when array has not
2702 * yet been started. Once running, replacement is automatic
2703 * from spares, or by assigning 'slot'.
2705 if (rdev
->mddev
->pers
)
2708 set_bit(Replacement
, &rdev
->flags
);
2711 } else if (cmd_match(buf
, "-replacement")) {
2712 /* Similarly, can only clear Replacement before start */
2713 if (rdev
->mddev
->pers
)
2716 clear_bit(Replacement
, &rdev
->flags
);
2721 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2722 return err
? err
: len
;
2724 static struct rdev_sysfs_entry rdev_state
=
2725 __ATTR(state
, S_IRUGO
|S_IWUSR
, state_show
, state_store
);
2728 errors_show(struct md_rdev
*rdev
, char *page
)
2730 return sprintf(page
, "%d\n", atomic_read(&rdev
->corrected_errors
));
2734 errors_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2737 unsigned long n
= simple_strtoul(buf
, &e
, 10);
2738 if (*buf
&& (*e
== 0 || *e
== '\n')) {
2739 atomic_set(&rdev
->corrected_errors
, n
);
2744 static struct rdev_sysfs_entry rdev_errors
=
2745 __ATTR(errors
, S_IRUGO
|S_IWUSR
, errors_show
, errors_store
);
2748 slot_show(struct md_rdev
*rdev
, char *page
)
2750 if (rdev
->raid_disk
< 0)
2751 return sprintf(page
, "none\n");
2753 return sprintf(page
, "%d\n", rdev
->raid_disk
);
2757 slot_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2761 int slot
= simple_strtoul(buf
, &e
, 10);
2762 if (strncmp(buf
, "none", 4)==0)
2764 else if (e
==buf
|| (*e
&& *e
!= '\n'))
2766 if (rdev
->mddev
->pers
&& slot
== -1) {
2767 /* Setting 'slot' on an active array requires also
2768 * updating the 'rd%d' link, and communicating
2769 * with the personality with ->hot_*_disk.
2770 * For now we only support removing
2771 * failed/spare devices. This normally happens automatically,
2772 * but not when the metadata is externally managed.
2774 if (rdev
->raid_disk
== -1)
2776 /* personality does all needed checks */
2777 if (rdev
->mddev
->pers
->hot_remove_disk
== NULL
)
2779 clear_bit(Blocked
, &rdev
->flags
);
2780 remove_and_add_spares(rdev
->mddev
, rdev
);
2781 if (rdev
->raid_disk
>= 0)
2783 set_bit(MD_RECOVERY_NEEDED
, &rdev
->mddev
->recovery
);
2784 md_wakeup_thread(rdev
->mddev
->thread
);
2785 } else if (rdev
->mddev
->pers
) {
2786 /* Activating a spare .. or possibly reactivating
2787 * if we ever get bitmaps working here.
2790 if (rdev
->raid_disk
!= -1)
2793 if (test_bit(MD_RECOVERY_RUNNING
, &rdev
->mddev
->recovery
))
2796 if (rdev
->mddev
->pers
->hot_add_disk
== NULL
)
2799 if (slot
>= rdev
->mddev
->raid_disks
&&
2800 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2803 rdev
->raid_disk
= slot
;
2804 if (test_bit(In_sync
, &rdev
->flags
))
2805 rdev
->saved_raid_disk
= slot
;
2807 rdev
->saved_raid_disk
= -1;
2808 clear_bit(In_sync
, &rdev
->flags
);
2809 clear_bit(Bitmap_sync
, &rdev
->flags
);
2810 err
= rdev
->mddev
->pers
->
2811 hot_add_disk(rdev
->mddev
, rdev
);
2813 rdev
->raid_disk
= -1;
2816 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2817 if (sysfs_link_rdev(rdev
->mddev
, rdev
))
2818 /* failure here is OK */;
2819 /* don't wakeup anyone, leave that to userspace. */
2821 if (slot
>= rdev
->mddev
->raid_disks
&&
2822 slot
>= rdev
->mddev
->raid_disks
+ rdev
->mddev
->delta_disks
)
2824 rdev
->raid_disk
= slot
;
2825 /* assume it is working */
2826 clear_bit(Faulty
, &rdev
->flags
);
2827 clear_bit(WriteMostly
, &rdev
->flags
);
2828 set_bit(In_sync
, &rdev
->flags
);
2829 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
2835 static struct rdev_sysfs_entry rdev_slot
=
2836 __ATTR(slot
, S_IRUGO
|S_IWUSR
, slot_show
, slot_store
);
2839 offset_show(struct md_rdev
*rdev
, char *page
)
2841 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->data_offset
);
2845 offset_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2847 unsigned long long offset
;
2848 if (kstrtoull(buf
, 10, &offset
) < 0)
2850 if (rdev
->mddev
->pers
&& rdev
->raid_disk
>= 0)
2852 if (rdev
->sectors
&& rdev
->mddev
->external
)
2853 /* Must set offset before size, so overlap checks
2856 rdev
->data_offset
= offset
;
2857 rdev
->new_data_offset
= offset
;
2861 static struct rdev_sysfs_entry rdev_offset
=
2862 __ATTR(offset
, S_IRUGO
|S_IWUSR
, offset_show
, offset_store
);
2864 static ssize_t
new_offset_show(struct md_rdev
*rdev
, char *page
)
2866 return sprintf(page
, "%llu\n",
2867 (unsigned long long)rdev
->new_data_offset
);
2870 static ssize_t
new_offset_store(struct md_rdev
*rdev
,
2871 const char *buf
, size_t len
)
2873 unsigned long long new_offset
;
2874 struct mddev
*mddev
= rdev
->mddev
;
2876 if (kstrtoull(buf
, 10, &new_offset
) < 0)
2879 if (mddev
->sync_thread
)
2881 if (new_offset
== rdev
->data_offset
)
2882 /* reset is always permitted */
2884 else if (new_offset
> rdev
->data_offset
) {
2885 /* must not push array size beyond rdev_sectors */
2886 if (new_offset
- rdev
->data_offset
2887 + mddev
->dev_sectors
> rdev
->sectors
)
2890 /* Metadata worries about other space details. */
2892 /* decreasing the offset is inconsistent with a backwards
2895 if (new_offset
< rdev
->data_offset
&&
2896 mddev
->reshape_backwards
)
2898 /* Increasing offset is inconsistent with forwards
2899 * reshape. reshape_direction should be set to
2900 * 'backwards' first.
2902 if (new_offset
> rdev
->data_offset
&&
2903 !mddev
->reshape_backwards
)
2906 if (mddev
->pers
&& mddev
->persistent
&&
2907 !super_types
[mddev
->major_version
]
2908 .allow_new_offset(rdev
, new_offset
))
2910 rdev
->new_data_offset
= new_offset
;
2911 if (new_offset
> rdev
->data_offset
)
2912 mddev
->reshape_backwards
= 1;
2913 else if (new_offset
< rdev
->data_offset
)
2914 mddev
->reshape_backwards
= 0;
2918 static struct rdev_sysfs_entry rdev_new_offset
=
2919 __ATTR(new_offset
, S_IRUGO
|S_IWUSR
, new_offset_show
, new_offset_store
);
2922 rdev_size_show(struct md_rdev
*rdev
, char *page
)
2924 return sprintf(page
, "%llu\n", (unsigned long long)rdev
->sectors
/ 2);
2927 static int overlaps(sector_t s1
, sector_t l1
, sector_t s2
, sector_t l2
)
2929 /* check if two start/length pairs overlap */
2937 static int strict_blocks_to_sectors(const char *buf
, sector_t
*sectors
)
2939 unsigned long long blocks
;
2942 if (kstrtoull(buf
, 10, &blocks
) < 0)
2945 if (blocks
& 1ULL << (8 * sizeof(blocks
) - 1))
2946 return -EINVAL
; /* sector conversion overflow */
2949 if (new != blocks
* 2)
2950 return -EINVAL
; /* unsigned long long to sector_t overflow */
2957 rdev_size_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
2959 struct mddev
*my_mddev
= rdev
->mddev
;
2960 sector_t oldsectors
= rdev
->sectors
;
2963 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
2965 if (rdev
->data_offset
!= rdev
->new_data_offset
)
2966 return -EINVAL
; /* too confusing */
2967 if (my_mddev
->pers
&& rdev
->raid_disk
>= 0) {
2968 if (my_mddev
->persistent
) {
2969 sectors
= super_types
[my_mddev
->major_version
].
2970 rdev_size_change(rdev
, sectors
);
2973 } else if (!sectors
)
2974 sectors
= (i_size_read(rdev
->bdev
->bd_inode
) >> 9) -
2976 if (!my_mddev
->pers
->resize
)
2977 /* Cannot change size for RAID0 or Linear etc */
2980 if (sectors
< my_mddev
->dev_sectors
)
2981 return -EINVAL
; /* component must fit device */
2983 rdev
->sectors
= sectors
;
2984 if (sectors
> oldsectors
&& my_mddev
->external
) {
2985 /* need to check that all other rdevs with the same ->bdev
2986 * do not overlap. We need to unlock the mddev to avoid
2987 * a deadlock. We have already changed rdev->sectors, and if
2988 * we have to change it back, we will have the lock again.
2990 struct mddev
*mddev
;
2992 struct list_head
*tmp
;
2994 mddev_unlock(my_mddev
);
2995 for_each_mddev(mddev
, tmp
) {
2996 struct md_rdev
*rdev2
;
2998 mddev_lock_nointr(mddev
);
2999 rdev_for_each(rdev2
, mddev
)
3000 if (rdev
->bdev
== rdev2
->bdev
&&
3002 overlaps(rdev
->data_offset
, rdev
->sectors
,
3008 mddev_unlock(mddev
);
3014 mddev_lock_nointr(my_mddev
);
3016 /* Someone else could have slipped in a size
3017 * change here, but doing so is just silly.
3018 * We put oldsectors back because we *know* it is
3019 * safe, and trust userspace not to race with
3022 rdev
->sectors
= oldsectors
;
3029 static struct rdev_sysfs_entry rdev_size
=
3030 __ATTR(size
, S_IRUGO
|S_IWUSR
, rdev_size_show
, rdev_size_store
);
3033 static ssize_t
recovery_start_show(struct md_rdev
*rdev
, char *page
)
3035 unsigned long long recovery_start
= rdev
->recovery_offset
;
3037 if (test_bit(In_sync
, &rdev
->flags
) ||
3038 recovery_start
== MaxSector
)
3039 return sprintf(page
, "none\n");
3041 return sprintf(page
, "%llu\n", recovery_start
);
3044 static ssize_t
recovery_start_store(struct md_rdev
*rdev
, const char *buf
, size_t len
)
3046 unsigned long long recovery_start
;
3048 if (cmd_match(buf
, "none"))
3049 recovery_start
= MaxSector
;
3050 else if (kstrtoull(buf
, 10, &recovery_start
))
3053 if (rdev
->mddev
->pers
&&
3054 rdev
->raid_disk
>= 0)
3057 rdev
->recovery_offset
= recovery_start
;
3058 if (recovery_start
== MaxSector
)
3059 set_bit(In_sync
, &rdev
->flags
);
3061 clear_bit(In_sync
, &rdev
->flags
);
3065 static struct rdev_sysfs_entry rdev_recovery_start
=
3066 __ATTR(recovery_start
, S_IRUGO
|S_IWUSR
, recovery_start_show
, recovery_start_store
);
3070 badblocks_show(struct badblocks
*bb
, char *page
, int unack
);
3072 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
);
3074 static ssize_t
bb_show(struct md_rdev
*rdev
, char *page
)
3076 return badblocks_show(&rdev
->badblocks
, page
, 0);
3078 static ssize_t
bb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3080 int rv
= badblocks_store(&rdev
->badblocks
, page
, len
, 0);
3081 /* Maybe that ack was all we needed */
3082 if (test_and_clear_bit(BlockedBadBlocks
, &rdev
->flags
))
3083 wake_up(&rdev
->blocked_wait
);
3086 static struct rdev_sysfs_entry rdev_bad_blocks
=
3087 __ATTR(bad_blocks
, S_IRUGO
|S_IWUSR
, bb_show
, bb_store
);
3090 static ssize_t
ubb_show(struct md_rdev
*rdev
, char *page
)
3092 return badblocks_show(&rdev
->badblocks
, page
, 1);
3094 static ssize_t
ubb_store(struct md_rdev
*rdev
, const char *page
, size_t len
)
3096 return badblocks_store(&rdev
->badblocks
, page
, len
, 1);
3098 static struct rdev_sysfs_entry rdev_unack_bad_blocks
=
3099 __ATTR(unacknowledged_bad_blocks
, S_IRUGO
|S_IWUSR
, ubb_show
, ubb_store
);
3101 static struct attribute
*rdev_default_attrs
[] = {
3106 &rdev_new_offset
.attr
,
3108 &rdev_recovery_start
.attr
,
3109 &rdev_bad_blocks
.attr
,
3110 &rdev_unack_bad_blocks
.attr
,
3114 rdev_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
3116 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3117 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3118 struct mddev
*mddev
= rdev
->mddev
;
3124 rv
= mddev
? mddev_lock(mddev
) : -EBUSY
;
3126 if (rdev
->mddev
== NULL
)
3129 rv
= entry
->show(rdev
, page
);
3130 mddev_unlock(mddev
);
3136 rdev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
3137 const char *page
, size_t length
)
3139 struct rdev_sysfs_entry
*entry
= container_of(attr
, struct rdev_sysfs_entry
, attr
);
3140 struct md_rdev
*rdev
= container_of(kobj
, struct md_rdev
, kobj
);
3142 struct mddev
*mddev
= rdev
->mddev
;
3146 if (!capable(CAP_SYS_ADMIN
))
3148 rv
= mddev
? mddev_lock(mddev
): -EBUSY
;
3150 if (rdev
->mddev
== NULL
)
3153 rv
= entry
->store(rdev
, page
, length
);
3154 mddev_unlock(mddev
);
3159 static void rdev_free(struct kobject
*ko
)
3161 struct md_rdev
*rdev
= container_of(ko
, struct md_rdev
, kobj
);
3164 static const struct sysfs_ops rdev_sysfs_ops
= {
3165 .show
= rdev_attr_show
,
3166 .store
= rdev_attr_store
,
3168 static struct kobj_type rdev_ktype
= {
3169 .release
= rdev_free
,
3170 .sysfs_ops
= &rdev_sysfs_ops
,
3171 .default_attrs
= rdev_default_attrs
,
3174 int md_rdev_init(struct md_rdev
*rdev
)
3177 rdev
->saved_raid_disk
= -1;
3178 rdev
->raid_disk
= -1;
3180 rdev
->data_offset
= 0;
3181 rdev
->new_data_offset
= 0;
3182 rdev
->sb_events
= 0;
3183 rdev
->last_read_error
.tv_sec
= 0;
3184 rdev
->last_read_error
.tv_nsec
= 0;
3185 rdev
->sb_loaded
= 0;
3186 rdev
->bb_page
= NULL
;
3187 atomic_set(&rdev
->nr_pending
, 0);
3188 atomic_set(&rdev
->read_errors
, 0);
3189 atomic_set(&rdev
->corrected_errors
, 0);
3191 INIT_LIST_HEAD(&rdev
->same_set
);
3192 init_waitqueue_head(&rdev
->blocked_wait
);
3194 /* Add space to store bad block list.
3195 * This reserves the space even on arrays where it cannot
3196 * be used - I wonder if that matters
3198 rdev
->badblocks
.count
= 0;
3199 rdev
->badblocks
.shift
= -1; /* disabled until explicitly enabled */
3200 rdev
->badblocks
.page
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
3201 seqlock_init(&rdev
->badblocks
.lock
);
3202 if (rdev
->badblocks
.page
== NULL
)
3207 EXPORT_SYMBOL_GPL(md_rdev_init
);
3209 * Import a device. If 'super_format' >= 0, then sanity check the superblock
3211 * mark the device faulty if:
3213 * - the device is nonexistent (zero size)
3214 * - the device has no valid superblock
3216 * a faulty rdev _never_ has rdev->sb set.
3218 static struct md_rdev
*md_import_device(dev_t newdev
, int super_format
, int super_minor
)
3220 char b
[BDEVNAME_SIZE
];
3222 struct md_rdev
*rdev
;
3225 rdev
= kzalloc(sizeof(*rdev
), GFP_KERNEL
);
3227 printk(KERN_ERR
"md: could not alloc mem for new device!\n");
3228 return ERR_PTR(-ENOMEM
);
3231 err
= md_rdev_init(rdev
);
3234 err
= alloc_disk_sb(rdev
);
3238 err
= lock_rdev(rdev
, newdev
, super_format
== -2);
3242 kobject_init(&rdev
->kobj
, &rdev_ktype
);
3244 size
= i_size_read(rdev
->bdev
->bd_inode
) >> BLOCK_SIZE_BITS
;
3247 "md: %s has zero or unknown size, marking faulty!\n",
3248 bdevname(rdev
->bdev
,b
));
3253 if (super_format
>= 0) {
3254 err
= super_types
[super_format
].
3255 load_super(rdev
, NULL
, super_minor
);
3256 if (err
== -EINVAL
) {
3258 "md: %s does not have a valid v%d.%d "
3259 "superblock, not importing!\n",
3260 bdevname(rdev
->bdev
,b
),
3261 super_format
, super_minor
);
3266 "md: could not read %s's sb, not importing!\n",
3267 bdevname(rdev
->bdev
,b
));
3277 md_rdev_clear(rdev
);
3279 return ERR_PTR(err
);
3283 * Check a full RAID array for plausibility
3287 static void analyze_sbs(struct mddev
* mddev
)
3290 struct md_rdev
*rdev
, *freshest
, *tmp
;
3291 char b
[BDEVNAME_SIZE
];
3294 rdev_for_each_safe(rdev
, tmp
, mddev
)
3295 switch (super_types
[mddev
->major_version
].
3296 load_super(rdev
, freshest
, mddev
->minor_version
)) {
3304 "md: fatal superblock inconsistency in %s"
3305 " -- removing from array\n",
3306 bdevname(rdev
->bdev
,b
));
3307 kick_rdev_from_array(rdev
);
3311 super_types
[mddev
->major_version
].
3312 validate_super(mddev
, freshest
);
3315 rdev_for_each_safe(rdev
, tmp
, mddev
) {
3316 if (mddev
->max_disks
&&
3317 (rdev
->desc_nr
>= mddev
->max_disks
||
3318 i
> mddev
->max_disks
)) {
3320 "md: %s: %s: only %d devices permitted\n",
3321 mdname(mddev
), bdevname(rdev
->bdev
, b
),
3323 kick_rdev_from_array(rdev
);
3326 if (rdev
!= freshest
)
3327 if (super_types
[mddev
->major_version
].
3328 validate_super(mddev
, rdev
)) {
3329 printk(KERN_WARNING
"md: kicking non-fresh %s"
3331 bdevname(rdev
->bdev
,b
));
3332 kick_rdev_from_array(rdev
);
3335 if (mddev
->level
== LEVEL_MULTIPATH
) {
3336 rdev
->desc_nr
= i
++;
3337 rdev
->raid_disk
= rdev
->desc_nr
;
3338 set_bit(In_sync
, &rdev
->flags
);
3339 } else if (rdev
->raid_disk
>= (mddev
->raid_disks
- min(0, mddev
->delta_disks
))) {
3340 rdev
->raid_disk
= -1;
3341 clear_bit(In_sync
, &rdev
->flags
);
3346 /* Read a fixed-point number.
3347 * Numbers in sysfs attributes should be in "standard" units where
3348 * possible, so time should be in seconds.
3349 * However we internally use a a much smaller unit such as
3350 * milliseconds or jiffies.
3351 * This function takes a decimal number with a possible fractional
3352 * component, and produces an integer which is the result of
3353 * multiplying that number by 10^'scale'.
3354 * all without any floating-point arithmetic.
3356 int strict_strtoul_scaled(const char *cp
, unsigned long *res
, int scale
)
3358 unsigned long result
= 0;
3360 while (isdigit(*cp
) || (*cp
== '.' && decimals
< 0)) {
3363 else if (decimals
< scale
) {
3366 result
= result
* 10 + value
;
3378 while (decimals
< scale
) {
3387 static void md_safemode_timeout(unsigned long data
);
3390 safe_delay_show(struct mddev
*mddev
, char *page
)
3392 int msec
= (mddev
->safemode_delay
*1000)/HZ
;
3393 return sprintf(page
, "%d.%03d\n", msec
/1000, msec
%1000);
3396 safe_delay_store(struct mddev
*mddev
, const char *cbuf
, size_t len
)
3400 if (strict_strtoul_scaled(cbuf
, &msec
, 3) < 0)
3403 mddev
->safemode_delay
= 0;
3405 unsigned long old_delay
= mddev
->safemode_delay
;
3406 mddev
->safemode_delay
= (msec
*HZ
)/1000;
3407 if (mddev
->safemode_delay
== 0)
3408 mddev
->safemode_delay
= 1;
3409 if (mddev
->safemode_delay
< old_delay
|| old_delay
== 0)
3410 md_safemode_timeout((unsigned long)mddev
);
3414 static struct md_sysfs_entry md_safe_delay
=
3415 __ATTR(safe_mode_delay
, S_IRUGO
|S_IWUSR
,safe_delay_show
, safe_delay_store
);
3418 level_show(struct mddev
*mddev
, char *page
)
3420 struct md_personality
*p
= mddev
->pers
;
3422 return sprintf(page
, "%s\n", p
->name
);
3423 else if (mddev
->clevel
[0])
3424 return sprintf(page
, "%s\n", mddev
->clevel
);
3425 else if (mddev
->level
!= LEVEL_NONE
)
3426 return sprintf(page
, "%d\n", mddev
->level
);
3432 level_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3436 struct md_personality
*pers
;
3439 struct md_rdev
*rdev
;
3441 if (mddev
->pers
== NULL
) {
3444 if (len
>= sizeof(mddev
->clevel
))
3446 strncpy(mddev
->clevel
, buf
, len
);
3447 if (mddev
->clevel
[len
-1] == '\n')
3449 mddev
->clevel
[len
] = 0;
3450 mddev
->level
= LEVEL_NONE
;
3454 /* request to change the personality. Need to ensure:
3455 * - array is not engaged in resync/recovery/reshape
3456 * - old personality can be suspended
3457 * - new personality will access other array.
3460 if (mddev
->sync_thread
||
3461 mddev
->reshape_position
!= MaxSector
||
3462 mddev
->sysfs_active
)
3465 if (!mddev
->pers
->quiesce
) {
3466 printk(KERN_WARNING
"md: %s: %s does not support online personality change\n",
3467 mdname(mddev
), mddev
->pers
->name
);
3471 /* Now find the new personality */
3472 if (len
== 0 || len
>= sizeof(clevel
))
3474 strncpy(clevel
, buf
, len
);
3475 if (clevel
[len
-1] == '\n')
3478 if (kstrtol(clevel
, 10, &level
))
3481 if (request_module("md-%s", clevel
) != 0)
3482 request_module("md-level-%s", clevel
);
3483 spin_lock(&pers_lock
);
3484 pers
= find_pers(level
, clevel
);
3485 if (!pers
|| !try_module_get(pers
->owner
)) {
3486 spin_unlock(&pers_lock
);
3487 printk(KERN_WARNING
"md: personality %s not loaded\n", clevel
);
3490 spin_unlock(&pers_lock
);
3492 if (pers
== mddev
->pers
) {
3493 /* Nothing to do! */
3494 module_put(pers
->owner
);
3497 if (!pers
->takeover
) {
3498 module_put(pers
->owner
);
3499 printk(KERN_WARNING
"md: %s: %s does not support personality takeover\n",
3500 mdname(mddev
), clevel
);
3504 rdev_for_each(rdev
, mddev
)
3505 rdev
->new_raid_disk
= rdev
->raid_disk
;
3507 /* ->takeover must set new_* and/or delta_disks
3508 * if it succeeds, and may set them when it fails.
3510 priv
= pers
->takeover(mddev
);
3512 mddev
->new_level
= mddev
->level
;
3513 mddev
->new_layout
= mddev
->layout
;
3514 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3515 mddev
->raid_disks
-= mddev
->delta_disks
;
3516 mddev
->delta_disks
= 0;
3517 mddev
->reshape_backwards
= 0;
3518 module_put(pers
->owner
);
3519 printk(KERN_WARNING
"md: %s: %s would not accept array\n",
3520 mdname(mddev
), clevel
);
3521 return PTR_ERR(priv
);
3524 /* Looks like we have a winner */
3525 mddev_suspend(mddev
);
3526 mddev
->pers
->stop(mddev
);
3528 if (mddev
->pers
->sync_request
== NULL
&&
3529 pers
->sync_request
!= NULL
) {
3530 /* need to add the md_redundancy_group */
3531 if (sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
3533 "md: cannot register extra attributes for %s\n",
3535 mddev
->sysfs_action
= sysfs_get_dirent(mddev
->kobj
.sd
, "sync_action");
3537 if (mddev
->pers
->sync_request
!= NULL
&&
3538 pers
->sync_request
== NULL
) {
3539 /* need to remove the md_redundancy_group */
3540 if (mddev
->to_remove
== NULL
)
3541 mddev
->to_remove
= &md_redundancy_group
;
3544 if (mddev
->pers
->sync_request
== NULL
&&
3546 /* We are converting from a no-redundancy array
3547 * to a redundancy array and metadata is managed
3548 * externally so we need to be sure that writes
3549 * won't block due to a need to transition
3551 * until external management is started.
3554 mddev
->safemode_delay
= 0;
3555 mddev
->safemode
= 0;
3558 rdev_for_each(rdev
, mddev
) {
3559 if (rdev
->raid_disk
< 0)
3561 if (rdev
->new_raid_disk
>= mddev
->raid_disks
)
3562 rdev
->new_raid_disk
= -1;
3563 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3565 sysfs_unlink_rdev(mddev
, rdev
);
3567 rdev_for_each(rdev
, mddev
) {
3568 if (rdev
->raid_disk
< 0)
3570 if (rdev
->new_raid_disk
== rdev
->raid_disk
)
3572 rdev
->raid_disk
= rdev
->new_raid_disk
;
3573 if (rdev
->raid_disk
< 0)
3574 clear_bit(In_sync
, &rdev
->flags
);
3576 if (sysfs_link_rdev(mddev
, rdev
))
3577 printk(KERN_WARNING
"md: cannot register rd%d"
3578 " for %s after level change\n",
3579 rdev
->raid_disk
, mdname(mddev
));
3583 module_put(mddev
->pers
->owner
);
3585 mddev
->private = priv
;
3586 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
3587 mddev
->level
= mddev
->new_level
;
3588 mddev
->layout
= mddev
->new_layout
;
3589 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
3590 mddev
->delta_disks
= 0;
3591 mddev
->reshape_backwards
= 0;
3592 mddev
->degraded
= 0;
3593 if (mddev
->pers
->sync_request
== NULL
) {
3594 /* this is now an array without redundancy, so
3595 * it must always be in_sync
3598 del_timer_sync(&mddev
->safemode_timer
);
3600 blk_set_stacking_limits(&mddev
->queue
->limits
);
3602 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
3603 mddev_resume(mddev
);
3605 md_update_sb(mddev
, 1);
3606 sysfs_notify(&mddev
->kobj
, NULL
, "level");
3607 md_new_event(mddev
);
3611 static struct md_sysfs_entry md_level
=
3612 __ATTR(level
, S_IRUGO
|S_IWUSR
, level_show
, level_store
);
3616 layout_show(struct mddev
*mddev
, char *page
)
3618 /* just a number, not meaningful for all levels */
3619 if (mddev
->reshape_position
!= MaxSector
&&
3620 mddev
->layout
!= mddev
->new_layout
)
3621 return sprintf(page
, "%d (%d)\n",
3622 mddev
->new_layout
, mddev
->layout
);
3623 return sprintf(page
, "%d\n", mddev
->layout
);
3627 layout_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3630 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3632 if (!*buf
|| (*e
&& *e
!= '\n'))
3637 if (mddev
->pers
->check_reshape
== NULL
)
3639 mddev
->new_layout
= n
;
3640 err
= mddev
->pers
->check_reshape(mddev
);
3642 mddev
->new_layout
= mddev
->layout
;
3646 mddev
->new_layout
= n
;
3647 if (mddev
->reshape_position
== MaxSector
)
3652 static struct md_sysfs_entry md_layout
=
3653 __ATTR(layout
, S_IRUGO
|S_IWUSR
, layout_show
, layout_store
);
3657 raid_disks_show(struct mddev
*mddev
, char *page
)
3659 if (mddev
->raid_disks
== 0)
3661 if (mddev
->reshape_position
!= MaxSector
&&
3662 mddev
->delta_disks
!= 0)
3663 return sprintf(page
, "%d (%d)\n", mddev
->raid_disks
,
3664 mddev
->raid_disks
- mddev
->delta_disks
);
3665 return sprintf(page
, "%d\n", mddev
->raid_disks
);
3668 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
);
3671 raid_disks_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3675 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3677 if (!*buf
|| (*e
&& *e
!= '\n'))
3681 rv
= update_raid_disks(mddev
, n
);
3682 else if (mddev
->reshape_position
!= MaxSector
) {
3683 struct md_rdev
*rdev
;
3684 int olddisks
= mddev
->raid_disks
- mddev
->delta_disks
;
3686 rdev_for_each(rdev
, mddev
) {
3688 rdev
->data_offset
< rdev
->new_data_offset
)
3691 rdev
->data_offset
> rdev
->new_data_offset
)
3694 mddev
->delta_disks
= n
- olddisks
;
3695 mddev
->raid_disks
= n
;
3696 mddev
->reshape_backwards
= (mddev
->delta_disks
< 0);
3698 mddev
->raid_disks
= n
;
3699 return rv
? rv
: len
;
3701 static struct md_sysfs_entry md_raid_disks
=
3702 __ATTR(raid_disks
, S_IRUGO
|S_IWUSR
, raid_disks_show
, raid_disks_store
);
3705 chunk_size_show(struct mddev
*mddev
, char *page
)
3707 if (mddev
->reshape_position
!= MaxSector
&&
3708 mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
3709 return sprintf(page
, "%d (%d)\n",
3710 mddev
->new_chunk_sectors
<< 9,
3711 mddev
->chunk_sectors
<< 9);
3712 return sprintf(page
, "%d\n", mddev
->chunk_sectors
<< 9);
3716 chunk_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3719 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3721 if (!*buf
|| (*e
&& *e
!= '\n'))
3726 if (mddev
->pers
->check_reshape
== NULL
)
3728 mddev
->new_chunk_sectors
= n
>> 9;
3729 err
= mddev
->pers
->check_reshape(mddev
);
3731 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
3735 mddev
->new_chunk_sectors
= n
>> 9;
3736 if (mddev
->reshape_position
== MaxSector
)
3737 mddev
->chunk_sectors
= n
>> 9;
3741 static struct md_sysfs_entry md_chunk_size
=
3742 __ATTR(chunk_size
, S_IRUGO
|S_IWUSR
, chunk_size_show
, chunk_size_store
);
3745 resync_start_show(struct mddev
*mddev
, char *page
)
3747 if (mddev
->recovery_cp
== MaxSector
)
3748 return sprintf(page
, "none\n");
3749 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->recovery_cp
);
3753 resync_start_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3756 unsigned long long n
= simple_strtoull(buf
, &e
, 10);
3758 if (mddev
->pers
&& !test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3760 if (cmd_match(buf
, "none"))
3762 else if (!*buf
|| (*e
&& *e
!= '\n'))
3765 mddev
->recovery_cp
= n
;
3767 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3770 static struct md_sysfs_entry md_resync_start
=
3771 __ATTR(resync_start
, S_IRUGO
|S_IWUSR
, resync_start_show
, resync_start_store
);
3774 * The array state can be:
3777 * No devices, no size, no level
3778 * Equivalent to STOP_ARRAY ioctl
3780 * May have some settings, but array is not active
3781 * all IO results in error
3782 * When written, doesn't tear down array, but just stops it
3783 * suspended (not supported yet)
3784 * All IO requests will block. The array can be reconfigured.
3785 * Writing this, if accepted, will block until array is quiescent
3787 * no resync can happen. no superblocks get written.
3788 * write requests fail
3790 * like readonly, but behaves like 'clean' on a write request.
3792 * clean - no pending writes, but otherwise active.
3793 * When written to inactive array, starts without resync
3794 * If a write request arrives then
3795 * if metadata is known, mark 'dirty' and switch to 'active'.
3796 * if not known, block and switch to write-pending
3797 * If written to an active array that has pending writes, then fails.
3799 * fully active: IO and resync can be happening.
3800 * When written to inactive array, starts with resync
3803 * clean, but writes are blocked waiting for 'active' to be written.
3806 * like active, but no writes have been seen for a while (100msec).
3809 enum array_state
{ clear
, inactive
, suspended
, readonly
, read_auto
, clean
, active
,
3810 write_pending
, active_idle
, bad_word
};
3811 static char *array_states
[] = {
3812 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3813 "write-pending", "active-idle", NULL
};
3815 static int match_word(const char *word
, char **list
)
3818 for (n
=0; list
[n
]; n
++)
3819 if (cmd_match(word
, list
[n
]))
3825 array_state_show(struct mddev
*mddev
, char *page
)
3827 enum array_state st
= inactive
;
3840 else if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
3842 else if (mddev
->safemode
)
3848 if (list_empty(&mddev
->disks
) &&
3849 mddev
->raid_disks
== 0 &&
3850 mddev
->dev_sectors
== 0)
3855 return sprintf(page
, "%s\n", array_states
[st
]);
3858 static int do_md_stop(struct mddev
* mddev
, int ro
, struct block_device
*bdev
);
3859 static int md_set_readonly(struct mddev
* mddev
, struct block_device
*bdev
);
3860 static int do_md_run(struct mddev
* mddev
);
3861 static int restart_array(struct mddev
*mddev
);
3864 array_state_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3867 enum array_state st
= match_word(buf
, array_states
);
3872 /* stopping an active array */
3873 err
= do_md_stop(mddev
, 0, NULL
);
3876 /* stopping an active array */
3878 err
= do_md_stop(mddev
, 2, NULL
);
3880 err
= 0; /* already inactive */
3883 break; /* not supported yet */
3886 err
= md_set_readonly(mddev
, NULL
);
3889 set_disk_ro(mddev
->gendisk
, 1);
3890 err
= do_md_run(mddev
);
3896 err
= md_set_readonly(mddev
, NULL
);
3897 else if (mddev
->ro
== 1)
3898 err
= restart_array(mddev
);
3901 set_disk_ro(mddev
->gendisk
, 0);
3905 err
= do_md_run(mddev
);
3910 restart_array(mddev
);
3911 spin_lock_irq(&mddev
->write_lock
);
3912 if (atomic_read(&mddev
->writes_pending
) == 0) {
3913 if (mddev
->in_sync
== 0) {
3915 if (mddev
->safemode
== 1)
3916 mddev
->safemode
= 0;
3917 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
3922 spin_unlock_irq(&mddev
->write_lock
);
3928 restart_array(mddev
);
3929 clear_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
3930 wake_up(&mddev
->sb_wait
);
3934 set_disk_ro(mddev
->gendisk
, 0);
3935 err
= do_md_run(mddev
);
3940 /* these cannot be set */
3946 if (mddev
->hold_active
== UNTIL_IOCTL
)
3947 mddev
->hold_active
= 0;
3948 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
3952 static struct md_sysfs_entry md_array_state
=
3953 __ATTR(array_state
, S_IRUGO
|S_IWUSR
, array_state_show
, array_state_store
);
3956 max_corrected_read_errors_show(struct mddev
*mddev
, char *page
) {
3957 return sprintf(page
, "%d\n",
3958 atomic_read(&mddev
->max_corr_read_errors
));
3962 max_corrected_read_errors_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3965 unsigned long n
= simple_strtoul(buf
, &e
, 10);
3967 if (*buf
&& (*e
== 0 || *e
== '\n')) {
3968 atomic_set(&mddev
->max_corr_read_errors
, n
);
3974 static struct md_sysfs_entry max_corr_read_errors
=
3975 __ATTR(max_read_errors
, S_IRUGO
|S_IWUSR
, max_corrected_read_errors_show
,
3976 max_corrected_read_errors_store
);
3979 null_show(struct mddev
*mddev
, char *page
)
3985 new_dev_store(struct mddev
*mddev
, const char *buf
, size_t len
)
3987 /* buf must be %d:%d\n? giving major and minor numbers */
3988 /* The new device is added to the array.
3989 * If the array has a persistent superblock, we read the
3990 * superblock to initialise info and check validity.
3991 * Otherwise, only checking done is that in bind_rdev_to_array,
3992 * which mainly checks size.
3995 int major
= simple_strtoul(buf
, &e
, 10);
3998 struct md_rdev
*rdev
;
4001 if (!*buf
|| *e
!= ':' || !e
[1] || e
[1] == '\n')
4003 minor
= simple_strtoul(e
+1, &e
, 10);
4004 if (*e
&& *e
!= '\n')
4006 dev
= MKDEV(major
, minor
);
4007 if (major
!= MAJOR(dev
) ||
4008 minor
!= MINOR(dev
))
4012 if (mddev
->persistent
) {
4013 rdev
= md_import_device(dev
, mddev
->major_version
,
4014 mddev
->minor_version
);
4015 if (!IS_ERR(rdev
) && !list_empty(&mddev
->disks
)) {
4016 struct md_rdev
*rdev0
4017 = list_entry(mddev
->disks
.next
,
4018 struct md_rdev
, same_set
);
4019 err
= super_types
[mddev
->major_version
]
4020 .load_super(rdev
, rdev0
, mddev
->minor_version
);
4024 } else if (mddev
->external
)
4025 rdev
= md_import_device(dev
, -2, -1);
4027 rdev
= md_import_device(dev
, -1, -1);
4030 return PTR_ERR(rdev
);
4031 err
= bind_rdev_to_array(rdev
, mddev
);
4035 return err
? err
: len
;
4038 static struct md_sysfs_entry md_new_device
=
4039 __ATTR(new_dev
, S_IWUSR
, null_show
, new_dev_store
);
4042 bitmap_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4045 unsigned long chunk
, end_chunk
;
4049 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
4051 chunk
= end_chunk
= simple_strtoul(buf
, &end
, 0);
4052 if (buf
== end
) break;
4053 if (*end
== '-') { /* range */
4055 end_chunk
= simple_strtoul(buf
, &end
, 0);
4056 if (buf
== end
) break;
4058 if (*end
&& !isspace(*end
)) break;
4059 bitmap_dirty_bits(mddev
->bitmap
, chunk
, end_chunk
);
4060 buf
= skip_spaces(end
);
4062 bitmap_unplug(mddev
->bitmap
); /* flush the bits to disk */
4067 static struct md_sysfs_entry md_bitmap
=
4068 __ATTR(bitmap_set_bits
, S_IWUSR
, null_show
, bitmap_store
);
4071 size_show(struct mddev
*mddev
, char *page
)
4073 return sprintf(page
, "%llu\n",
4074 (unsigned long long)mddev
->dev_sectors
/ 2);
4077 static int update_size(struct mddev
*mddev
, sector_t num_sectors
);
4080 size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4082 /* If array is inactive, we can reduce the component size, but
4083 * not increase it (except from 0).
4084 * If array is active, we can try an on-line resize
4087 int err
= strict_blocks_to_sectors(buf
, §ors
);
4092 err
= update_size(mddev
, sectors
);
4093 md_update_sb(mddev
, 1);
4095 if (mddev
->dev_sectors
== 0 ||
4096 mddev
->dev_sectors
> sectors
)
4097 mddev
->dev_sectors
= sectors
;
4101 return err
? err
: len
;
4104 static struct md_sysfs_entry md_size
=
4105 __ATTR(component_size
, S_IRUGO
|S_IWUSR
, size_show
, size_store
);
4108 /* Metadata version.
4110 * 'none' for arrays with no metadata (good luck...)
4111 * 'external' for arrays with externally managed metadata,
4112 * or N.M for internally known formats
4115 metadata_show(struct mddev
*mddev
, char *page
)
4117 if (mddev
->persistent
)
4118 return sprintf(page
, "%d.%d\n",
4119 mddev
->major_version
, mddev
->minor_version
);
4120 else if (mddev
->external
)
4121 return sprintf(page
, "external:%s\n", mddev
->metadata_type
);
4123 return sprintf(page
, "none\n");
4127 metadata_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4131 /* Changing the details of 'external' metadata is
4132 * always permitted. Otherwise there must be
4133 * no devices attached to the array.
4135 if (mddev
->external
&& strncmp(buf
, "external:", 9) == 0)
4137 else if (!list_empty(&mddev
->disks
))
4140 if (cmd_match(buf
, "none")) {
4141 mddev
->persistent
= 0;
4142 mddev
->external
= 0;
4143 mddev
->major_version
= 0;
4144 mddev
->minor_version
= 90;
4147 if (strncmp(buf
, "external:", 9) == 0) {
4148 size_t namelen
= len
-9;
4149 if (namelen
>= sizeof(mddev
->metadata_type
))
4150 namelen
= sizeof(mddev
->metadata_type
)-1;
4151 strncpy(mddev
->metadata_type
, buf
+9, namelen
);
4152 mddev
->metadata_type
[namelen
] = 0;
4153 if (namelen
&& mddev
->metadata_type
[namelen
-1] == '\n')
4154 mddev
->metadata_type
[--namelen
] = 0;
4155 mddev
->persistent
= 0;
4156 mddev
->external
= 1;
4157 mddev
->major_version
= 0;
4158 mddev
->minor_version
= 90;
4161 major
= simple_strtoul(buf
, &e
, 10);
4162 if (e
==buf
|| *e
!= '.')
4165 minor
= simple_strtoul(buf
, &e
, 10);
4166 if (e
==buf
|| (*e
&& *e
!= '\n') )
4168 if (major
>= ARRAY_SIZE(super_types
) || super_types
[major
].name
== NULL
)
4170 mddev
->major_version
= major
;
4171 mddev
->minor_version
= minor
;
4172 mddev
->persistent
= 1;
4173 mddev
->external
= 0;
4177 static struct md_sysfs_entry md_metadata
=
4178 __ATTR(metadata_version
, S_IRUGO
|S_IWUSR
, metadata_show
, metadata_store
);
4181 action_show(struct mddev
*mddev
, char *page
)
4183 char *type
= "idle";
4184 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
4186 else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4187 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
4188 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4190 else if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
4191 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
4193 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
4197 } else if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
4200 return sprintf(page
, "%s\n", type
);
4204 action_store(struct mddev
*mddev
, const char *page
, size_t len
)
4206 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
4209 if (cmd_match(page
, "frozen"))
4210 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4212 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
4214 if (cmd_match(page
, "idle") || cmd_match(page
, "frozen")) {
4215 if (mddev
->sync_thread
) {
4216 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
4217 md_reap_sync_thread(mddev
);
4219 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
4220 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
4222 else if (cmd_match(page
, "resync"))
4223 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4224 else if (cmd_match(page
, "recover")) {
4225 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
4226 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4227 } else if (cmd_match(page
, "reshape")) {
4229 if (mddev
->pers
->start_reshape
== NULL
)
4231 err
= mddev
->pers
->start_reshape(mddev
);
4234 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
4236 if (cmd_match(page
, "check"))
4237 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
4238 else if (!cmd_match(page
, "repair"))
4240 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
4241 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
4243 if (mddev
->ro
== 2) {
4244 /* A write to sync_action is enough to justify
4245 * canceling read-auto mode
4248 md_wakeup_thread(mddev
->sync_thread
);
4250 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
4251 md_wakeup_thread(mddev
->thread
);
4252 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
4256 static struct md_sysfs_entry md_scan_mode
=
4257 __ATTR(sync_action
, S_IRUGO
|S_IWUSR
, action_show
, action_store
);
4260 last_sync_action_show(struct mddev
*mddev
, char *page
)
4262 return sprintf(page
, "%s\n", mddev
->last_sync_action
);
4265 static struct md_sysfs_entry md_last_scan_mode
= __ATTR_RO(last_sync_action
);
4268 mismatch_cnt_show(struct mddev
*mddev
, char *page
)
4270 return sprintf(page
, "%llu\n",
4271 (unsigned long long)
4272 atomic64_read(&mddev
->resync_mismatches
));
4275 static struct md_sysfs_entry md_mismatches
= __ATTR_RO(mismatch_cnt
);
4278 sync_min_show(struct mddev
*mddev
, char *page
)
4280 return sprintf(page
, "%d (%s)\n", speed_min(mddev
),
4281 mddev
->sync_speed_min
? "local": "system");
4285 sync_min_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4289 if (strncmp(buf
, "system", 6)==0) {
4290 mddev
->sync_speed_min
= 0;
4293 min
= simple_strtoul(buf
, &e
, 10);
4294 if (buf
== e
|| (*e
&& *e
!= '\n') || min
<= 0)
4296 mddev
->sync_speed_min
= min
;
4300 static struct md_sysfs_entry md_sync_min
=
4301 __ATTR(sync_speed_min
, S_IRUGO
|S_IWUSR
, sync_min_show
, sync_min_store
);
4304 sync_max_show(struct mddev
*mddev
, char *page
)
4306 return sprintf(page
, "%d (%s)\n", speed_max(mddev
),
4307 mddev
->sync_speed_max
? "local": "system");
4311 sync_max_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4315 if (strncmp(buf
, "system", 6)==0) {
4316 mddev
->sync_speed_max
= 0;
4319 max
= simple_strtoul(buf
, &e
, 10);
4320 if (buf
== e
|| (*e
&& *e
!= '\n') || max
<= 0)
4322 mddev
->sync_speed_max
= max
;
4326 static struct md_sysfs_entry md_sync_max
=
4327 __ATTR(sync_speed_max
, S_IRUGO
|S_IWUSR
, sync_max_show
, sync_max_store
);
4330 degraded_show(struct mddev
*mddev
, char *page
)
4332 return sprintf(page
, "%d\n", mddev
->degraded
);
4334 static struct md_sysfs_entry md_degraded
= __ATTR_RO(degraded
);
4337 sync_force_parallel_show(struct mddev
*mddev
, char *page
)
4339 return sprintf(page
, "%d\n", mddev
->parallel_resync
);
4343 sync_force_parallel_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4347 if (kstrtol(buf
, 10, &n
))
4350 if (n
!= 0 && n
!= 1)
4353 mddev
->parallel_resync
= n
;
4355 if (mddev
->sync_thread
)
4356 wake_up(&resync_wait
);
4361 /* force parallel resync, even with shared block devices */
4362 static struct md_sysfs_entry md_sync_force_parallel
=
4363 __ATTR(sync_force_parallel
, S_IRUGO
|S_IWUSR
,
4364 sync_force_parallel_show
, sync_force_parallel_store
);
4367 sync_speed_show(struct mddev
*mddev
, char *page
)
4369 unsigned long resync
, dt
, db
;
4370 if (mddev
->curr_resync
== 0)
4371 return sprintf(page
, "none\n");
4372 resync
= mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
);
4373 dt
= (jiffies
- mddev
->resync_mark
) / HZ
;
4375 db
= resync
- mddev
->resync_mark_cnt
;
4376 return sprintf(page
, "%lu\n", db
/dt
/2); /* K/sec */
4379 static struct md_sysfs_entry md_sync_speed
= __ATTR_RO(sync_speed
);
4382 sync_completed_show(struct mddev
*mddev
, char *page
)
4384 unsigned long long max_sectors
, resync
;
4386 if (!test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4387 return sprintf(page
, "none\n");
4389 if (mddev
->curr_resync
== 1 ||
4390 mddev
->curr_resync
== 2)
4391 return sprintf(page
, "delayed\n");
4393 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
4394 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
4395 max_sectors
= mddev
->resync_max_sectors
;
4397 max_sectors
= mddev
->dev_sectors
;
4399 resync
= mddev
->curr_resync_completed
;
4400 return sprintf(page
, "%llu / %llu\n", resync
, max_sectors
);
4403 static struct md_sysfs_entry md_sync_completed
= __ATTR_RO(sync_completed
);
4406 min_sync_show(struct mddev
*mddev
, char *page
)
4408 return sprintf(page
, "%llu\n",
4409 (unsigned long long)mddev
->resync_min
);
4412 min_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4414 unsigned long long min
;
4415 if (kstrtoull(buf
, 10, &min
))
4417 if (min
> mddev
->resync_max
)
4419 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4422 /* Must be a multiple of chunk_size */
4423 if (mddev
->chunk_sectors
) {
4424 sector_t temp
= min
;
4425 if (sector_div(temp
, mddev
->chunk_sectors
))
4428 mddev
->resync_min
= min
;
4433 static struct md_sysfs_entry md_min_sync
=
4434 __ATTR(sync_min
, S_IRUGO
|S_IWUSR
, min_sync_show
, min_sync_store
);
4437 max_sync_show(struct mddev
*mddev
, char *page
)
4439 if (mddev
->resync_max
== MaxSector
)
4440 return sprintf(page
, "max\n");
4442 return sprintf(page
, "%llu\n",
4443 (unsigned long long)mddev
->resync_max
);
4446 max_sync_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4448 if (strncmp(buf
, "max", 3) == 0)
4449 mddev
->resync_max
= MaxSector
;
4451 unsigned long long max
;
4452 if (kstrtoull(buf
, 10, &max
))
4454 if (max
< mddev
->resync_min
)
4456 if (max
< mddev
->resync_max
&&
4458 test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
4461 /* Must be a multiple of chunk_size */
4462 if (mddev
->chunk_sectors
) {
4463 sector_t temp
= max
;
4464 if (sector_div(temp
, mddev
->chunk_sectors
))
4467 mddev
->resync_max
= max
;
4469 wake_up(&mddev
->recovery_wait
);
4473 static struct md_sysfs_entry md_max_sync
=
4474 __ATTR(sync_max
, S_IRUGO
|S_IWUSR
, max_sync_show
, max_sync_store
);
4477 suspend_lo_show(struct mddev
*mddev
, char *page
)
4479 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_lo
);
4483 suspend_lo_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4486 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4487 unsigned long long old
= mddev
->suspend_lo
;
4489 if (mddev
->pers
== NULL
||
4490 mddev
->pers
->quiesce
== NULL
)
4492 if (buf
== e
|| (*e
&& *e
!= '\n'))
4495 mddev
->suspend_lo
= new;
4497 /* Shrinking suspended region */
4498 mddev
->pers
->quiesce(mddev
, 2);
4500 /* Expanding suspended region - need to wait */
4501 mddev
->pers
->quiesce(mddev
, 1);
4502 mddev
->pers
->quiesce(mddev
, 0);
4506 static struct md_sysfs_entry md_suspend_lo
=
4507 __ATTR(suspend_lo
, S_IRUGO
|S_IWUSR
, suspend_lo_show
, suspend_lo_store
);
4511 suspend_hi_show(struct mddev
*mddev
, char *page
)
4513 return sprintf(page
, "%llu\n", (unsigned long long)mddev
->suspend_hi
);
4517 suspend_hi_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4520 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4521 unsigned long long old
= mddev
->suspend_hi
;
4523 if (mddev
->pers
== NULL
||
4524 mddev
->pers
->quiesce
== NULL
)
4526 if (buf
== e
|| (*e
&& *e
!= '\n'))
4529 mddev
->suspend_hi
= new;
4531 /* Shrinking suspended region */
4532 mddev
->pers
->quiesce(mddev
, 2);
4534 /* Expanding suspended region - need to wait */
4535 mddev
->pers
->quiesce(mddev
, 1);
4536 mddev
->pers
->quiesce(mddev
, 0);
4540 static struct md_sysfs_entry md_suspend_hi
=
4541 __ATTR(suspend_hi
, S_IRUGO
|S_IWUSR
, suspend_hi_show
, suspend_hi_store
);
4544 reshape_position_show(struct mddev
*mddev
, char *page
)
4546 if (mddev
->reshape_position
!= MaxSector
)
4547 return sprintf(page
, "%llu\n",
4548 (unsigned long long)mddev
->reshape_position
);
4549 strcpy(page
, "none\n");
4554 reshape_position_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4556 struct md_rdev
*rdev
;
4558 unsigned long long new = simple_strtoull(buf
, &e
, 10);
4561 if (buf
== e
|| (*e
&& *e
!= '\n'))
4563 mddev
->reshape_position
= new;
4564 mddev
->delta_disks
= 0;
4565 mddev
->reshape_backwards
= 0;
4566 mddev
->new_level
= mddev
->level
;
4567 mddev
->new_layout
= mddev
->layout
;
4568 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
4569 rdev_for_each(rdev
, mddev
)
4570 rdev
->new_data_offset
= rdev
->data_offset
;
4574 static struct md_sysfs_entry md_reshape_position
=
4575 __ATTR(reshape_position
, S_IRUGO
|S_IWUSR
, reshape_position_show
,
4576 reshape_position_store
);
4579 reshape_direction_show(struct mddev
*mddev
, char *page
)
4581 return sprintf(page
, "%s\n",
4582 mddev
->reshape_backwards
? "backwards" : "forwards");
4586 reshape_direction_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4589 if (cmd_match(buf
, "forwards"))
4591 else if (cmd_match(buf
, "backwards"))
4595 if (mddev
->reshape_backwards
== backwards
)
4598 /* check if we are allowed to change */
4599 if (mddev
->delta_disks
)
4602 if (mddev
->persistent
&&
4603 mddev
->major_version
== 0)
4606 mddev
->reshape_backwards
= backwards
;
4610 static struct md_sysfs_entry md_reshape_direction
=
4611 __ATTR(reshape_direction
, S_IRUGO
|S_IWUSR
, reshape_direction_show
,
4612 reshape_direction_store
);
4615 array_size_show(struct mddev
*mddev
, char *page
)
4617 if (mddev
->external_size
)
4618 return sprintf(page
, "%llu\n",
4619 (unsigned long long)mddev
->array_sectors
/2);
4621 return sprintf(page
, "default\n");
4625 array_size_store(struct mddev
*mddev
, const char *buf
, size_t len
)
4629 if (strncmp(buf
, "default", 7) == 0) {
4631 sectors
= mddev
->pers
->size(mddev
, 0, 0);
4633 sectors
= mddev
->array_sectors
;
4635 mddev
->external_size
= 0;
4637 if (strict_blocks_to_sectors(buf
, §ors
) < 0)
4639 if (mddev
->pers
&& mddev
->pers
->size(mddev
, 0, 0) < sectors
)
4642 mddev
->external_size
= 1;
4645 mddev
->array_sectors
= sectors
;
4647 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
4648 revalidate_disk(mddev
->gendisk
);
4653 static struct md_sysfs_entry md_array_size
=
4654 __ATTR(array_size
, S_IRUGO
|S_IWUSR
, array_size_show
,
4657 static struct attribute
*md_default_attrs
[] = {
4660 &md_raid_disks
.attr
,
4661 &md_chunk_size
.attr
,
4663 &md_resync_start
.attr
,
4665 &md_new_device
.attr
,
4666 &md_safe_delay
.attr
,
4667 &md_array_state
.attr
,
4668 &md_reshape_position
.attr
,
4669 &md_reshape_direction
.attr
,
4670 &md_array_size
.attr
,
4671 &max_corr_read_errors
.attr
,
4675 static struct attribute
*md_redundancy_attrs
[] = {
4677 &md_last_scan_mode
.attr
,
4678 &md_mismatches
.attr
,
4681 &md_sync_speed
.attr
,
4682 &md_sync_force_parallel
.attr
,
4683 &md_sync_completed
.attr
,
4686 &md_suspend_lo
.attr
,
4687 &md_suspend_hi
.attr
,
4692 static struct attribute_group md_redundancy_group
= {
4694 .attrs
= md_redundancy_attrs
,
4699 md_attr_show(struct kobject
*kobj
, struct attribute
*attr
, char *page
)
4701 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4702 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4707 spin_lock(&all_mddevs_lock
);
4708 if (list_empty(&mddev
->all_mddevs
)) {
4709 spin_unlock(&all_mddevs_lock
);
4713 spin_unlock(&all_mddevs_lock
);
4715 rv
= mddev_lock(mddev
);
4717 rv
= entry
->show(mddev
, page
);
4718 mddev_unlock(mddev
);
4725 md_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
4726 const char *page
, size_t length
)
4728 struct md_sysfs_entry
*entry
= container_of(attr
, struct md_sysfs_entry
, attr
);
4729 struct mddev
*mddev
= container_of(kobj
, struct mddev
, kobj
);
4734 if (!capable(CAP_SYS_ADMIN
))
4736 spin_lock(&all_mddevs_lock
);
4737 if (list_empty(&mddev
->all_mddevs
)) {
4738 spin_unlock(&all_mddevs_lock
);
4742 spin_unlock(&all_mddevs_lock
);
4743 if (entry
->store
== new_dev_store
)
4744 flush_workqueue(md_misc_wq
);
4745 rv
= mddev_lock(mddev
);
4747 rv
= entry
->store(mddev
, page
, length
);
4748 mddev_unlock(mddev
);
4754 static void md_free(struct kobject
*ko
)
4756 struct mddev
*mddev
= container_of(ko
, struct mddev
, kobj
);
4758 if (mddev
->sysfs_state
)
4759 sysfs_put(mddev
->sysfs_state
);
4761 if (mddev
->gendisk
) {
4762 del_gendisk(mddev
->gendisk
);
4763 put_disk(mddev
->gendisk
);
4766 blk_cleanup_queue(mddev
->queue
);
4771 static const struct sysfs_ops md_sysfs_ops
= {
4772 .show
= md_attr_show
,
4773 .store
= md_attr_store
,
4775 static struct kobj_type md_ktype
= {
4777 .sysfs_ops
= &md_sysfs_ops
,
4778 .default_attrs
= md_default_attrs
,
4783 static void mddev_delayed_delete(struct work_struct
*ws
)
4785 struct mddev
*mddev
= container_of(ws
, struct mddev
, del_work
);
4787 sysfs_remove_group(&mddev
->kobj
, &md_bitmap_group
);
4788 kobject_del(&mddev
->kobj
);
4789 kobject_put(&mddev
->kobj
);
4792 static int md_alloc(dev_t dev
, char *name
)
4794 static DEFINE_MUTEX(disks_mutex
);
4795 struct mddev
*mddev
= mddev_find(dev
);
4796 struct gendisk
*disk
;
4805 partitioned
= (MAJOR(mddev
->unit
) != MD_MAJOR
);
4806 shift
= partitioned
? MdpMinorShift
: 0;
4807 unit
= MINOR(mddev
->unit
) >> shift
;
4809 /* wait for any previous instance of this device to be
4810 * completely removed (mddev_delayed_delete).
4812 flush_workqueue(md_misc_wq
);
4814 mutex_lock(&disks_mutex
);
4820 /* Need to ensure that 'name' is not a duplicate.
4822 struct mddev
*mddev2
;
4823 spin_lock(&all_mddevs_lock
);
4825 list_for_each_entry(mddev2
, &all_mddevs
, all_mddevs
)
4826 if (mddev2
->gendisk
&&
4827 strcmp(mddev2
->gendisk
->disk_name
, name
) == 0) {
4828 spin_unlock(&all_mddevs_lock
);
4831 spin_unlock(&all_mddevs_lock
);
4835 mddev
->queue
= blk_alloc_queue(GFP_KERNEL
);
4838 mddev
->queue
->queuedata
= mddev
;
4840 blk_queue_make_request(mddev
->queue
, md_make_request
);
4841 blk_set_stacking_limits(&mddev
->queue
->limits
);
4843 disk
= alloc_disk(1 << shift
);
4845 blk_cleanup_queue(mddev
->queue
);
4846 mddev
->queue
= NULL
;
4849 disk
->major
= MAJOR(mddev
->unit
);
4850 disk
->first_minor
= unit
<< shift
;
4852 strcpy(disk
->disk_name
, name
);
4853 else if (partitioned
)
4854 sprintf(disk
->disk_name
, "md_d%d", unit
);
4856 sprintf(disk
->disk_name
, "md%d", unit
);
4857 disk
->fops
= &md_fops
;
4858 disk
->private_data
= mddev
;
4859 disk
->queue
= mddev
->queue
;
4860 blk_queue_flush(mddev
->queue
, REQ_FLUSH
| REQ_FUA
);
4861 /* Allow extended partitions. This makes the
4862 * 'mdp' device redundant, but we can't really
4865 disk
->flags
|= GENHD_FL_EXT_DEVT
;
4866 mddev
->gendisk
= disk
;
4867 /* As soon as we call add_disk(), another thread could get
4868 * through to md_open, so make sure it doesn't get too far
4870 mutex_lock(&mddev
->open_mutex
);
4873 error
= kobject_init_and_add(&mddev
->kobj
, &md_ktype
,
4874 &disk_to_dev(disk
)->kobj
, "%s", "md");
4876 /* This isn't possible, but as kobject_init_and_add is marked
4877 * __must_check, we must do something with the result
4879 printk(KERN_WARNING
"md: cannot register %s/md - name in use\n",
4883 if (mddev
->kobj
.sd
&&
4884 sysfs_create_group(&mddev
->kobj
, &md_bitmap_group
))
4885 printk(KERN_DEBUG
"pointless warning\n");
4886 mutex_unlock(&mddev
->open_mutex
);
4888 mutex_unlock(&disks_mutex
);
4889 if (!error
&& mddev
->kobj
.sd
) {
4890 kobject_uevent(&mddev
->kobj
, KOBJ_ADD
);
4891 mddev
->sysfs_state
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "array_state");
4897 static struct kobject
*md_probe(dev_t dev
, int *part
, void *data
)
4899 md_alloc(dev
, NULL
);
4903 static int add_named_array(const char *val
, struct kernel_param
*kp
)
4905 /* val must be "md_*" where * is not all digits.
4906 * We allocate an array with a large free minor number, and
4907 * set the name to val. val must not already be an active name.
4909 int len
= strlen(val
);
4910 char buf
[DISK_NAME_LEN
];
4912 while (len
&& val
[len
-1] == '\n')
4914 if (len
>= DISK_NAME_LEN
)
4916 strlcpy(buf
, val
, len
+1);
4917 if (strncmp(buf
, "md_", 3) != 0)
4919 return md_alloc(0, buf
);
4922 static void md_safemode_timeout(unsigned long data
)
4924 struct mddev
*mddev
= (struct mddev
*) data
;
4926 if (!atomic_read(&mddev
->writes_pending
)) {
4927 mddev
->safemode
= 1;
4928 if (mddev
->external
)
4929 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
4931 md_wakeup_thread(mddev
->thread
);
4934 static int start_dirty_degraded
;
4936 int md_run(struct mddev
*mddev
)
4939 struct md_rdev
*rdev
;
4940 struct md_personality
*pers
;
4942 if (list_empty(&mddev
->disks
))
4943 /* cannot run an array with no devices.. */
4948 /* Cannot run until previous stop completes properly */
4949 if (mddev
->sysfs_active
)
4953 * Analyze all RAID superblock(s)
4955 if (!mddev
->raid_disks
) {
4956 if (!mddev
->persistent
)
4961 if (mddev
->level
!= LEVEL_NONE
)
4962 request_module("md-level-%d", mddev
->level
);
4963 else if (mddev
->clevel
[0])
4964 request_module("md-%s", mddev
->clevel
);
4967 * Drop all container device buffers, from now on
4968 * the only valid external interface is through the md
4971 rdev_for_each(rdev
, mddev
) {
4972 if (test_bit(Faulty
, &rdev
->flags
))
4974 sync_blockdev(rdev
->bdev
);
4975 invalidate_bdev(rdev
->bdev
);
4977 /* perform some consistency tests on the device.
4978 * We don't want the data to overlap the metadata,
4979 * Internal Bitmap issues have been handled elsewhere.
4981 if (rdev
->meta_bdev
) {
4982 /* Nothing to check */;
4983 } else if (rdev
->data_offset
< rdev
->sb_start
) {
4984 if (mddev
->dev_sectors
&&
4985 rdev
->data_offset
+ mddev
->dev_sectors
4987 printk("md: %s: data overlaps metadata\n",
4992 if (rdev
->sb_start
+ rdev
->sb_size
/512
4993 > rdev
->data_offset
) {
4994 printk("md: %s: metadata overlaps data\n",
4999 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5002 if (mddev
->bio_set
== NULL
)
5003 mddev
->bio_set
= bioset_create(BIO_POOL_SIZE
, 0);
5005 spin_lock(&pers_lock
);
5006 pers
= find_pers(mddev
->level
, mddev
->clevel
);
5007 if (!pers
|| !try_module_get(pers
->owner
)) {
5008 spin_unlock(&pers_lock
);
5009 if (mddev
->level
!= LEVEL_NONE
)
5010 printk(KERN_WARNING
"md: personality for level %d is not loaded!\n",
5013 printk(KERN_WARNING
"md: personality for level %s is not loaded!\n",
5018 spin_unlock(&pers_lock
);
5019 if (mddev
->level
!= pers
->level
) {
5020 mddev
->level
= pers
->level
;
5021 mddev
->new_level
= pers
->level
;
5023 strlcpy(mddev
->clevel
, pers
->name
, sizeof(mddev
->clevel
));
5025 if (mddev
->reshape_position
!= MaxSector
&&
5026 pers
->start_reshape
== NULL
) {
5027 /* This personality cannot handle reshaping... */
5029 module_put(pers
->owner
);
5033 if (pers
->sync_request
) {
5034 /* Warn if this is a potentially silly
5037 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5038 struct md_rdev
*rdev2
;
5041 rdev_for_each(rdev
, mddev
)
5042 rdev_for_each(rdev2
, mddev
) {
5044 rdev
->bdev
->bd_contains
==
5045 rdev2
->bdev
->bd_contains
) {
5047 "%s: WARNING: %s appears to be"
5048 " on the same physical disk as"
5051 bdevname(rdev
->bdev
,b
),
5052 bdevname(rdev2
->bdev
,b2
));
5059 "True protection against single-disk"
5060 " failure might be compromised.\n");
5063 mddev
->recovery
= 0;
5064 /* may be over-ridden by personality */
5065 mddev
->resync_max_sectors
= mddev
->dev_sectors
;
5067 mddev
->ok_start_degraded
= start_dirty_degraded
;
5069 if (start_readonly
&& mddev
->ro
== 0)
5070 mddev
->ro
= 2; /* read-only, but switch on first write */
5072 err
= mddev
->pers
->run(mddev
);
5074 printk(KERN_ERR
"md: pers->run() failed ...\n");
5075 else if (mddev
->pers
->size(mddev
, 0, 0) < mddev
->array_sectors
) {
5076 WARN_ONCE(!mddev
->external_size
, "%s: default size too small,"
5077 " but 'external_size' not in effect?\n", __func__
);
5079 "md: invalid array_size %llu > default size %llu\n",
5080 (unsigned long long)mddev
->array_sectors
/ 2,
5081 (unsigned long long)mddev
->pers
->size(mddev
, 0, 0) / 2);
5083 mddev
->pers
->stop(mddev
);
5085 if (err
== 0 && mddev
->pers
->sync_request
&&
5086 (mddev
->bitmap_info
.file
|| mddev
->bitmap_info
.offset
)) {
5087 err
= bitmap_create(mddev
);
5089 printk(KERN_ERR
"%s: failed to create bitmap (%d)\n",
5090 mdname(mddev
), err
);
5091 mddev
->pers
->stop(mddev
);
5095 module_put(mddev
->pers
->owner
);
5097 bitmap_destroy(mddev
);
5100 if (mddev
->pers
->sync_request
) {
5101 if (mddev
->kobj
.sd
&&
5102 sysfs_create_group(&mddev
->kobj
, &md_redundancy_group
))
5104 "md: cannot register extra attributes for %s\n",
5106 mddev
->sysfs_action
= sysfs_get_dirent_safe(mddev
->kobj
.sd
, "sync_action");
5107 } else if (mddev
->ro
== 2) /* auto-readonly not meaningful */
5110 atomic_set(&mddev
->writes_pending
,0);
5111 atomic_set(&mddev
->max_corr_read_errors
,
5112 MD_DEFAULT_MAX_CORRECTED_READ_ERRORS
);
5113 mddev
->safemode
= 0;
5114 mddev
->safemode_timer
.function
= md_safemode_timeout
;
5115 mddev
->safemode_timer
.data
= (unsigned long) mddev
;
5116 mddev
->safemode_delay
= (200 * HZ
)/1000 +1; /* 200 msec delay */
5120 rdev_for_each(rdev
, mddev
)
5121 if (rdev
->raid_disk
>= 0)
5122 if (sysfs_link_rdev(mddev
, rdev
))
5123 /* failure here is OK */;
5125 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5127 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
5128 md_update_sb(mddev
, 0);
5130 md_new_event(mddev
);
5131 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5132 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
5133 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
5136 EXPORT_SYMBOL_GPL(md_run
);
5138 static int do_md_run(struct mddev
*mddev
)
5142 err
= md_run(mddev
);
5145 err
= bitmap_load(mddev
);
5147 bitmap_destroy(mddev
);
5151 md_wakeup_thread(mddev
->thread
);
5152 md_wakeup_thread(mddev
->sync_thread
); /* possibly kick off a reshape */
5154 set_capacity(mddev
->gendisk
, mddev
->array_sectors
);
5155 revalidate_disk(mddev
->gendisk
);
5157 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5162 static int restart_array(struct mddev
*mddev
)
5164 struct gendisk
*disk
= mddev
->gendisk
;
5166 /* Complain if it has no devices */
5167 if (list_empty(&mddev
->disks
))
5173 mddev
->safemode
= 0;
5175 set_disk_ro(disk
, 0);
5176 printk(KERN_INFO
"md: %s switched to read-write mode.\n",
5178 /* Kick recovery or resync if necessary */
5179 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5180 md_wakeup_thread(mddev
->thread
);
5181 md_wakeup_thread(mddev
->sync_thread
);
5182 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5186 /* similar to deny_write_access, but accounts for our holding a reference
5187 * to the file ourselves */
5188 static int deny_bitmap_write_access(struct file
* file
)
5190 struct inode
*inode
= file
->f_mapping
->host
;
5192 spin_lock(&inode
->i_lock
);
5193 if (atomic_read(&inode
->i_writecount
) > 1) {
5194 spin_unlock(&inode
->i_lock
);
5197 atomic_set(&inode
->i_writecount
, -1);
5198 spin_unlock(&inode
->i_lock
);
5203 void restore_bitmap_write_access(struct file
*file
)
5205 struct inode
*inode
= file
->f_mapping
->host
;
5207 spin_lock(&inode
->i_lock
);
5208 atomic_set(&inode
->i_writecount
, 1);
5209 spin_unlock(&inode
->i_lock
);
5212 static void md_clean(struct mddev
*mddev
)
5214 mddev
->array_sectors
= 0;
5215 mddev
->external_size
= 0;
5216 mddev
->dev_sectors
= 0;
5217 mddev
->raid_disks
= 0;
5218 mddev
->recovery_cp
= 0;
5219 mddev
->resync_min
= 0;
5220 mddev
->resync_max
= MaxSector
;
5221 mddev
->reshape_position
= MaxSector
;
5222 mddev
->external
= 0;
5223 mddev
->persistent
= 0;
5224 mddev
->level
= LEVEL_NONE
;
5225 mddev
->clevel
[0] = 0;
5228 mddev
->metadata_type
[0] = 0;
5229 mddev
->chunk_sectors
= 0;
5230 mddev
->ctime
= mddev
->utime
= 0;
5232 mddev
->max_disks
= 0;
5234 mddev
->can_decrease_events
= 0;
5235 mddev
->delta_disks
= 0;
5236 mddev
->reshape_backwards
= 0;
5237 mddev
->new_level
= LEVEL_NONE
;
5238 mddev
->new_layout
= 0;
5239 mddev
->new_chunk_sectors
= 0;
5240 mddev
->curr_resync
= 0;
5241 atomic64_set(&mddev
->resync_mismatches
, 0);
5242 mddev
->suspend_lo
= mddev
->suspend_hi
= 0;
5243 mddev
->sync_speed_min
= mddev
->sync_speed_max
= 0;
5244 mddev
->recovery
= 0;
5247 mddev
->degraded
= 0;
5248 mddev
->safemode
= 0;
5249 mddev
->merge_check_needed
= 0;
5250 mddev
->bitmap_info
.offset
= 0;
5251 mddev
->bitmap_info
.default_offset
= 0;
5252 mddev
->bitmap_info
.default_space
= 0;
5253 mddev
->bitmap_info
.chunksize
= 0;
5254 mddev
->bitmap_info
.daemon_sleep
= 0;
5255 mddev
->bitmap_info
.max_write_behind
= 0;
5258 static void __md_stop_writes(struct mddev
*mddev
)
5260 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5261 if (mddev
->sync_thread
) {
5262 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5263 md_reap_sync_thread(mddev
);
5266 del_timer_sync(&mddev
->safemode_timer
);
5268 bitmap_flush(mddev
);
5269 md_super_wait(mddev
);
5271 if (mddev
->ro
== 0 &&
5272 (!mddev
->in_sync
|| (mddev
->flags
& MD_UPDATE_SB_FLAGS
))) {
5273 /* mark array as shutdown cleanly */
5275 md_update_sb(mddev
, 1);
5279 void md_stop_writes(struct mddev
*mddev
)
5281 mddev_lock_nointr(mddev
);
5282 __md_stop_writes(mddev
);
5283 mddev_unlock(mddev
);
5285 EXPORT_SYMBOL_GPL(md_stop_writes
);
5287 static void __md_stop(struct mddev
*mddev
)
5290 mddev
->pers
->stop(mddev
);
5291 if (mddev
->pers
->sync_request
&& mddev
->to_remove
== NULL
)
5292 mddev
->to_remove
= &md_redundancy_group
;
5293 module_put(mddev
->pers
->owner
);
5295 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5298 void md_stop(struct mddev
*mddev
)
5300 /* stop the array and free an attached data structures.
5301 * This is called from dm-raid
5304 bitmap_destroy(mddev
);
5306 bioset_free(mddev
->bio_set
);
5309 EXPORT_SYMBOL_GPL(md_stop
);
5311 static int md_set_readonly(struct mddev
*mddev
, struct block_device
*bdev
)
5316 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5318 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5319 md_wakeup_thread(mddev
->thread
);
5321 if (mddev
->sync_thread
) {
5322 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5323 /* Thread might be blocked waiting for metadata update
5324 * which will now never happen */
5325 wake_up_process(mddev
->sync_thread
->tsk
);
5327 mddev_unlock(mddev
);
5328 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5329 mddev_lock_nointr(mddev
);
5331 mutex_lock(&mddev
->open_mutex
);
5332 if (atomic_read(&mddev
->openers
) > !!bdev
||
5333 mddev
->sync_thread
||
5334 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5335 printk("md: %s still in use.\n",mdname(mddev
));
5337 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5338 md_wakeup_thread(mddev
->thread
);
5344 __md_stop_writes(mddev
);
5350 set_disk_ro(mddev
->gendisk
, 1);
5351 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5352 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5356 mutex_unlock(&mddev
->open_mutex
);
5361 * 0 - completely stop and dis-assemble array
5362 * 2 - stop but do not disassemble array
5364 static int do_md_stop(struct mddev
* mddev
, int mode
,
5365 struct block_device
*bdev
)
5367 struct gendisk
*disk
= mddev
->gendisk
;
5368 struct md_rdev
*rdev
;
5371 if (!test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
)) {
5373 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5374 md_wakeup_thread(mddev
->thread
);
5376 if (mddev
->sync_thread
) {
5377 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
5378 /* Thread might be blocked waiting for metadata update
5379 * which will now never happen */
5380 wake_up_process(mddev
->sync_thread
->tsk
);
5382 mddev_unlock(mddev
);
5383 wait_event(resync_wait
, mddev
->sync_thread
== NULL
);
5384 mddev_lock_nointr(mddev
);
5386 mutex_lock(&mddev
->open_mutex
);
5387 if (atomic_read(&mddev
->openers
) > !!bdev
||
5388 mddev
->sysfs_active
||
5389 mddev
->sync_thread
||
5390 (bdev
&& !test_bit(MD_STILL_CLOSED
, &mddev
->flags
))) {
5391 printk("md: %s still in use.\n",mdname(mddev
));
5392 mutex_unlock(&mddev
->open_mutex
);
5394 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
5395 md_wakeup_thread(mddev
->thread
);
5401 set_disk_ro(disk
, 0);
5403 __md_stop_writes(mddev
);
5405 mddev
->queue
->merge_bvec_fn
= NULL
;
5406 mddev
->queue
->backing_dev_info
.congested_fn
= NULL
;
5408 /* tell userspace to handle 'inactive' */
5409 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5411 rdev_for_each(rdev
, mddev
)
5412 if (rdev
->raid_disk
>= 0)
5413 sysfs_unlink_rdev(mddev
, rdev
);
5415 set_capacity(disk
, 0);
5416 mutex_unlock(&mddev
->open_mutex
);
5418 revalidate_disk(disk
);
5423 mutex_unlock(&mddev
->open_mutex
);
5425 * Free resources if final stop
5428 printk(KERN_INFO
"md: %s stopped.\n", mdname(mddev
));
5430 bitmap_destroy(mddev
);
5431 if (mddev
->bitmap_info
.file
) {
5432 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
5433 fput(mddev
->bitmap_info
.file
);
5434 mddev
->bitmap_info
.file
= NULL
;
5436 mddev
->bitmap_info
.offset
= 0;
5438 export_array(mddev
);
5441 kobject_uevent(&disk_to_dev(mddev
->gendisk
)->kobj
, KOBJ_CHANGE
);
5442 if (mddev
->hold_active
== UNTIL_STOP
)
5443 mddev
->hold_active
= 0;
5445 blk_integrity_unregister(disk
);
5446 md_new_event(mddev
);
5447 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
5452 static void autorun_array(struct mddev
*mddev
)
5454 struct md_rdev
*rdev
;
5457 if (list_empty(&mddev
->disks
))
5460 printk(KERN_INFO
"md: running: ");
5462 rdev_for_each(rdev
, mddev
) {
5463 char b
[BDEVNAME_SIZE
];
5464 printk("<%s>", bdevname(rdev
->bdev
,b
));
5468 err
= do_md_run(mddev
);
5470 printk(KERN_WARNING
"md: do_md_run() returned %d\n", err
);
5471 do_md_stop(mddev
, 0, NULL
);
5476 * lets try to run arrays based on all disks that have arrived
5477 * until now. (those are in pending_raid_disks)
5479 * the method: pick the first pending disk, collect all disks with
5480 * the same UUID, remove all from the pending list and put them into
5481 * the 'same_array' list. Then order this list based on superblock
5482 * update time (freshest comes first), kick out 'old' disks and
5483 * compare superblocks. If everything's fine then run it.
5485 * If "unit" is allocated, then bump its reference count
5487 static void autorun_devices(int part
)
5489 struct md_rdev
*rdev0
, *rdev
, *tmp
;
5490 struct mddev
*mddev
;
5491 char b
[BDEVNAME_SIZE
];
5493 printk(KERN_INFO
"md: autorun ...\n");
5494 while (!list_empty(&pending_raid_disks
)) {
5497 LIST_HEAD(candidates
);
5498 rdev0
= list_entry(pending_raid_disks
.next
,
5499 struct md_rdev
, same_set
);
5501 printk(KERN_INFO
"md: considering %s ...\n",
5502 bdevname(rdev0
->bdev
,b
));
5503 INIT_LIST_HEAD(&candidates
);
5504 rdev_for_each_list(rdev
, tmp
, &pending_raid_disks
)
5505 if (super_90_load(rdev
, rdev0
, 0) >= 0) {
5506 printk(KERN_INFO
"md: adding %s ...\n",
5507 bdevname(rdev
->bdev
,b
));
5508 list_move(&rdev
->same_set
, &candidates
);
5511 * now we have a set of devices, with all of them having
5512 * mostly sane superblocks. It's time to allocate the
5516 dev
= MKDEV(mdp_major
,
5517 rdev0
->preferred_minor
<< MdpMinorShift
);
5518 unit
= MINOR(dev
) >> MdpMinorShift
;
5520 dev
= MKDEV(MD_MAJOR
, rdev0
->preferred_minor
);
5523 if (rdev0
->preferred_minor
!= unit
) {
5524 printk(KERN_INFO
"md: unit number in %s is bad: %d\n",
5525 bdevname(rdev0
->bdev
, b
), rdev0
->preferred_minor
);
5529 md_probe(dev
, NULL
, NULL
);
5530 mddev
= mddev_find(dev
);
5531 if (!mddev
|| !mddev
->gendisk
) {
5535 "md: cannot allocate memory for md drive.\n");
5538 if (mddev_lock(mddev
))
5539 printk(KERN_WARNING
"md: %s locked, cannot run\n",
5541 else if (mddev
->raid_disks
|| mddev
->major_version
5542 || !list_empty(&mddev
->disks
)) {
5544 "md: %s already running, cannot run %s\n",
5545 mdname(mddev
), bdevname(rdev0
->bdev
,b
));
5546 mddev_unlock(mddev
);
5548 printk(KERN_INFO
"md: created %s\n", mdname(mddev
));
5549 mddev
->persistent
= 1;
5550 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5551 list_del_init(&rdev
->same_set
);
5552 if (bind_rdev_to_array(rdev
, mddev
))
5555 autorun_array(mddev
);
5556 mddev_unlock(mddev
);
5558 /* on success, candidates will be empty, on error
5561 rdev_for_each_list(rdev
, tmp
, &candidates
) {
5562 list_del_init(&rdev
->same_set
);
5567 printk(KERN_INFO
"md: ... autorun DONE.\n");
5569 #endif /* !MODULE */
5571 static int get_version(void __user
* arg
)
5575 ver
.major
= MD_MAJOR_VERSION
;
5576 ver
.minor
= MD_MINOR_VERSION
;
5577 ver
.patchlevel
= MD_PATCHLEVEL_VERSION
;
5579 if (copy_to_user(arg
, &ver
, sizeof(ver
)))
5585 static int get_array_info(struct mddev
* mddev
, void __user
* arg
)
5587 mdu_array_info_t info
;
5588 int nr
,working
,insync
,failed
,spare
;
5589 struct md_rdev
*rdev
;
5591 nr
= working
= insync
= failed
= spare
= 0;
5593 rdev_for_each_rcu(rdev
, mddev
) {
5595 if (test_bit(Faulty
, &rdev
->flags
))
5599 if (test_bit(In_sync
, &rdev
->flags
))
5607 info
.major_version
= mddev
->major_version
;
5608 info
.minor_version
= mddev
->minor_version
;
5609 info
.patch_version
= MD_PATCHLEVEL_VERSION
;
5610 info
.ctime
= mddev
->ctime
;
5611 info
.level
= mddev
->level
;
5612 info
.size
= mddev
->dev_sectors
/ 2;
5613 if (info
.size
!= mddev
->dev_sectors
/ 2) /* overflow */
5616 info
.raid_disks
= mddev
->raid_disks
;
5617 info
.md_minor
= mddev
->md_minor
;
5618 info
.not_persistent
= !mddev
->persistent
;
5620 info
.utime
= mddev
->utime
;
5623 info
.state
= (1<<MD_SB_CLEAN
);
5624 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
5625 info
.state
= (1<<MD_SB_BITMAP_PRESENT
);
5626 info
.active_disks
= insync
;
5627 info
.working_disks
= working
;
5628 info
.failed_disks
= failed
;
5629 info
.spare_disks
= spare
;
5631 info
.layout
= mddev
->layout
;
5632 info
.chunk_size
= mddev
->chunk_sectors
<< 9;
5634 if (copy_to_user(arg
, &info
, sizeof(info
)))
5640 static int get_bitmap_file(struct mddev
* mddev
, void __user
* arg
)
5642 mdu_bitmap_file_t
*file
= NULL
; /* too big for stack allocation */
5643 char *ptr
, *buf
= NULL
;
5646 file
= kmalloc(sizeof(*file
), GFP_NOIO
);
5651 /* bitmap disabled, zero the first byte and copy out */
5652 if (!mddev
->bitmap
|| !mddev
->bitmap
->storage
.file
) {
5653 file
->pathname
[0] = '\0';
5657 buf
= kmalloc(sizeof(file
->pathname
), GFP_KERNEL
);
5661 ptr
= d_path(&mddev
->bitmap
->storage
.file
->f_path
,
5662 buf
, sizeof(file
->pathname
));
5666 strcpy(file
->pathname
, ptr
);
5670 if (copy_to_user(arg
, file
, sizeof(*file
)))
5678 static int get_disk_info(struct mddev
* mddev
, void __user
* arg
)
5680 mdu_disk_info_t info
;
5681 struct md_rdev
*rdev
;
5683 if (copy_from_user(&info
, arg
, sizeof(info
)))
5687 rdev
= find_rdev_nr_rcu(mddev
, info
.number
);
5689 info
.major
= MAJOR(rdev
->bdev
->bd_dev
);
5690 info
.minor
= MINOR(rdev
->bdev
->bd_dev
);
5691 info
.raid_disk
= rdev
->raid_disk
;
5693 if (test_bit(Faulty
, &rdev
->flags
))
5694 info
.state
|= (1<<MD_DISK_FAULTY
);
5695 else if (test_bit(In_sync
, &rdev
->flags
)) {
5696 info
.state
|= (1<<MD_DISK_ACTIVE
);
5697 info
.state
|= (1<<MD_DISK_SYNC
);
5699 if (test_bit(WriteMostly
, &rdev
->flags
))
5700 info
.state
|= (1<<MD_DISK_WRITEMOSTLY
);
5702 info
.major
= info
.minor
= 0;
5703 info
.raid_disk
= -1;
5704 info
.state
= (1<<MD_DISK_REMOVED
);
5708 if (copy_to_user(arg
, &info
, sizeof(info
)))
5714 static int add_new_disk(struct mddev
* mddev
, mdu_disk_info_t
*info
)
5716 char b
[BDEVNAME_SIZE
], b2
[BDEVNAME_SIZE
];
5717 struct md_rdev
*rdev
;
5718 dev_t dev
= MKDEV(info
->major
,info
->minor
);
5720 if (info
->major
!= MAJOR(dev
) || info
->minor
!= MINOR(dev
))
5723 if (!mddev
->raid_disks
) {
5725 /* expecting a device which has a superblock */
5726 rdev
= md_import_device(dev
, mddev
->major_version
, mddev
->minor_version
);
5729 "md: md_import_device returned %ld\n",
5731 return PTR_ERR(rdev
);
5733 if (!list_empty(&mddev
->disks
)) {
5734 struct md_rdev
*rdev0
5735 = list_entry(mddev
->disks
.next
,
5736 struct md_rdev
, same_set
);
5737 err
= super_types
[mddev
->major_version
]
5738 .load_super(rdev
, rdev0
, mddev
->minor_version
);
5741 "md: %s has different UUID to %s\n",
5742 bdevname(rdev
->bdev
,b
),
5743 bdevname(rdev0
->bdev
,b2
));
5748 err
= bind_rdev_to_array(rdev
, mddev
);
5755 * add_new_disk can be used once the array is assembled
5756 * to add "hot spares". They must already have a superblock
5761 if (!mddev
->pers
->hot_add_disk
) {
5763 "%s: personality does not support diskops!\n",
5767 if (mddev
->persistent
)
5768 rdev
= md_import_device(dev
, mddev
->major_version
,
5769 mddev
->minor_version
);
5771 rdev
= md_import_device(dev
, -1, -1);
5774 "md: md_import_device returned %ld\n",
5776 return PTR_ERR(rdev
);
5778 /* set saved_raid_disk if appropriate */
5779 if (!mddev
->persistent
) {
5780 if (info
->state
& (1<<MD_DISK_SYNC
) &&
5781 info
->raid_disk
< mddev
->raid_disks
) {
5782 rdev
->raid_disk
= info
->raid_disk
;
5783 set_bit(In_sync
, &rdev
->flags
);
5784 clear_bit(Bitmap_sync
, &rdev
->flags
);
5786 rdev
->raid_disk
= -1;
5787 rdev
->saved_raid_disk
= rdev
->raid_disk
;
5789 super_types
[mddev
->major_version
].
5790 validate_super(mddev
, rdev
);
5791 if ((info
->state
& (1<<MD_DISK_SYNC
)) &&
5792 rdev
->raid_disk
!= info
->raid_disk
) {
5793 /* This was a hot-add request, but events doesn't
5794 * match, so reject it.
5800 clear_bit(In_sync
, &rdev
->flags
); /* just to be sure */
5801 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5802 set_bit(WriteMostly
, &rdev
->flags
);
5804 clear_bit(WriteMostly
, &rdev
->flags
);
5806 rdev
->raid_disk
= -1;
5807 err
= bind_rdev_to_array(rdev
, mddev
);
5808 if (!err
&& !mddev
->pers
->hot_remove_disk
) {
5809 /* If there is hot_add_disk but no hot_remove_disk
5810 * then added disks for geometry changes,
5811 * and should be added immediately.
5813 super_types
[mddev
->major_version
].
5814 validate_super(mddev
, rdev
);
5815 err
= mddev
->pers
->hot_add_disk(mddev
, rdev
);
5817 unbind_rdev_from_array(rdev
);
5822 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
5824 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
5825 if (mddev
->degraded
)
5826 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
5827 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5829 md_new_event(mddev
);
5830 md_wakeup_thread(mddev
->thread
);
5834 /* otherwise, add_new_disk is only allowed
5835 * for major_version==0 superblocks
5837 if (mddev
->major_version
!= 0) {
5838 printk(KERN_WARNING
"%s: ADD_NEW_DISK not supported\n",
5843 if (!(info
->state
& (1<<MD_DISK_FAULTY
))) {
5845 rdev
= md_import_device(dev
, -1, 0);
5848 "md: error, md_import_device() returned %ld\n",
5850 return PTR_ERR(rdev
);
5852 rdev
->desc_nr
= info
->number
;
5853 if (info
->raid_disk
< mddev
->raid_disks
)
5854 rdev
->raid_disk
= info
->raid_disk
;
5856 rdev
->raid_disk
= -1;
5858 if (rdev
->raid_disk
< mddev
->raid_disks
)
5859 if (info
->state
& (1<<MD_DISK_SYNC
))
5860 set_bit(In_sync
, &rdev
->flags
);
5862 if (info
->state
& (1<<MD_DISK_WRITEMOSTLY
))
5863 set_bit(WriteMostly
, &rdev
->flags
);
5865 if (!mddev
->persistent
) {
5866 printk(KERN_INFO
"md: nonpersistent superblock ...\n");
5867 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5869 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5870 rdev
->sectors
= rdev
->sb_start
;
5872 err
= bind_rdev_to_array(rdev
, mddev
);
5882 static int hot_remove_disk(struct mddev
* mddev
, dev_t dev
)
5884 char b
[BDEVNAME_SIZE
];
5885 struct md_rdev
*rdev
;
5887 rdev
= find_rdev(mddev
, dev
);
5891 clear_bit(Blocked
, &rdev
->flags
);
5892 remove_and_add_spares(mddev
, rdev
);
5894 if (rdev
->raid_disk
>= 0)
5897 kick_rdev_from_array(rdev
);
5898 md_update_sb(mddev
, 1);
5899 md_new_event(mddev
);
5903 printk(KERN_WARNING
"md: cannot remove active disk %s from %s ...\n",
5904 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5908 static int hot_add_disk(struct mddev
* mddev
, dev_t dev
)
5910 char b
[BDEVNAME_SIZE
];
5912 struct md_rdev
*rdev
;
5917 if (mddev
->major_version
!= 0) {
5918 printk(KERN_WARNING
"%s: HOT_ADD may only be used with"
5919 " version-0 superblocks.\n",
5923 if (!mddev
->pers
->hot_add_disk
) {
5925 "%s: personality does not support diskops!\n",
5930 rdev
= md_import_device(dev
, -1, 0);
5933 "md: error, md_import_device() returned %ld\n",
5938 if (mddev
->persistent
)
5939 rdev
->sb_start
= calc_dev_sboffset(rdev
);
5941 rdev
->sb_start
= i_size_read(rdev
->bdev
->bd_inode
) / 512;
5943 rdev
->sectors
= rdev
->sb_start
;
5945 if (test_bit(Faulty
, &rdev
->flags
)) {
5947 "md: can not hot-add faulty %s disk to %s!\n",
5948 bdevname(rdev
->bdev
,b
), mdname(mddev
));
5952 clear_bit(In_sync
, &rdev
->flags
);
5954 rdev
->saved_raid_disk
= -1;
5955 err
= bind_rdev_to_array(rdev
, mddev
);
5960 * The rest should better be atomic, we can have disk failures
5961 * noticed in interrupt contexts ...
5964 rdev
->raid_disk
= -1;
5966 md_update_sb(mddev
, 1);
5969 * Kick recovery, maybe this spare has to be added to the
5970 * array immediately.
5972 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
5973 md_wakeup_thread(mddev
->thread
);
5974 md_new_event(mddev
);
5982 static int set_bitmap_file(struct mddev
*mddev
, int fd
)
5987 if (!mddev
->pers
->quiesce
)
5989 if (mddev
->recovery
|| mddev
->sync_thread
)
5991 /* we should be able to change the bitmap.. */
5997 return -EEXIST
; /* cannot add when bitmap is present */
5998 mddev
->bitmap_info
.file
= fget(fd
);
6000 if (mddev
->bitmap_info
.file
== NULL
) {
6001 printk(KERN_ERR
"%s: error: failed to get bitmap file\n",
6006 err
= deny_bitmap_write_access(mddev
->bitmap_info
.file
);
6008 printk(KERN_ERR
"%s: error: bitmap file is already in use\n",
6010 fput(mddev
->bitmap_info
.file
);
6011 mddev
->bitmap_info
.file
= NULL
;
6014 mddev
->bitmap_info
.offset
= 0; /* file overrides offset */
6015 } else if (mddev
->bitmap
== NULL
)
6016 return -ENOENT
; /* cannot remove what isn't there */
6019 mddev
->pers
->quiesce(mddev
, 1);
6021 err
= bitmap_create(mddev
);
6023 err
= bitmap_load(mddev
);
6025 if (fd
< 0 || err
) {
6026 bitmap_destroy(mddev
);
6027 fd
= -1; /* make sure to put the file */
6029 mddev
->pers
->quiesce(mddev
, 0);
6032 if (mddev
->bitmap_info
.file
) {
6033 restore_bitmap_write_access(mddev
->bitmap_info
.file
);
6034 fput(mddev
->bitmap_info
.file
);
6036 mddev
->bitmap_info
.file
= NULL
;
6043 * set_array_info is used two different ways
6044 * The original usage is when creating a new array.
6045 * In this usage, raid_disks is > 0 and it together with
6046 * level, size, not_persistent,layout,chunksize determine the
6047 * shape of the array.
6048 * This will always create an array with a type-0.90.0 superblock.
6049 * The newer usage is when assembling an array.
6050 * In this case raid_disks will be 0, and the major_version field is
6051 * use to determine which style super-blocks are to be found on the devices.
6052 * The minor and patch _version numbers are also kept incase the
6053 * super_block handler wishes to interpret them.
6055 static int set_array_info(struct mddev
* mddev
, mdu_array_info_t
*info
)
6058 if (info
->raid_disks
== 0) {
6059 /* just setting version number for superblock loading */
6060 if (info
->major_version
< 0 ||
6061 info
->major_version
>= ARRAY_SIZE(super_types
) ||
6062 super_types
[info
->major_version
].name
== NULL
) {
6063 /* maybe try to auto-load a module? */
6065 "md: superblock version %d not known\n",
6066 info
->major_version
);
6069 mddev
->major_version
= info
->major_version
;
6070 mddev
->minor_version
= info
->minor_version
;
6071 mddev
->patch_version
= info
->patch_version
;
6072 mddev
->persistent
= !info
->not_persistent
;
6073 /* ensure mddev_put doesn't delete this now that there
6074 * is some minimal configuration.
6076 mddev
->ctime
= get_seconds();
6079 mddev
->major_version
= MD_MAJOR_VERSION
;
6080 mddev
->minor_version
= MD_MINOR_VERSION
;
6081 mddev
->patch_version
= MD_PATCHLEVEL_VERSION
;
6082 mddev
->ctime
= get_seconds();
6084 mddev
->level
= info
->level
;
6085 mddev
->clevel
[0] = 0;
6086 mddev
->dev_sectors
= 2 * (sector_t
)info
->size
;
6087 mddev
->raid_disks
= info
->raid_disks
;
6088 /* don't set md_minor, it is determined by which /dev/md* was
6091 if (info
->state
& (1<<MD_SB_CLEAN
))
6092 mddev
->recovery_cp
= MaxSector
;
6094 mddev
->recovery_cp
= 0;
6095 mddev
->persistent
= ! info
->not_persistent
;
6096 mddev
->external
= 0;
6098 mddev
->layout
= info
->layout
;
6099 mddev
->chunk_sectors
= info
->chunk_size
>> 9;
6101 mddev
->max_disks
= MD_SB_DISKS
;
6103 if (mddev
->persistent
)
6105 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
6107 mddev
->bitmap_info
.default_offset
= MD_SB_BYTES
>> 9;
6108 mddev
->bitmap_info
.default_space
= 64*2 - (MD_SB_BYTES
>> 9);
6109 mddev
->bitmap_info
.offset
= 0;
6111 mddev
->reshape_position
= MaxSector
;
6114 * Generate a 128 bit UUID
6116 get_random_bytes(mddev
->uuid
, 16);
6118 mddev
->new_level
= mddev
->level
;
6119 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
6120 mddev
->new_layout
= mddev
->layout
;
6121 mddev
->delta_disks
= 0;
6122 mddev
->reshape_backwards
= 0;
6127 void md_set_array_sectors(struct mddev
*mddev
, sector_t array_sectors
)
6129 WARN(!mddev_is_locked(mddev
), "%s: unlocked mddev!\n", __func__
);
6131 if (mddev
->external_size
)
6134 mddev
->array_sectors
= array_sectors
;
6136 EXPORT_SYMBOL(md_set_array_sectors
);
6138 static int update_size(struct mddev
*mddev
, sector_t num_sectors
)
6140 struct md_rdev
*rdev
;
6142 int fit
= (num_sectors
== 0);
6144 if (mddev
->pers
->resize
== NULL
)
6146 /* The "num_sectors" is the number of sectors of each device that
6147 * is used. This can only make sense for arrays with redundancy.
6148 * linear and raid0 always use whatever space is available. We can only
6149 * consider changing this number if no resync or reconstruction is
6150 * happening, and if the new size is acceptable. It must fit before the
6151 * sb_start or, if that is <data_offset, it must fit before the size
6152 * of each device. If num_sectors is zero, we find the largest size
6155 if (mddev
->sync_thread
)
6158 rdev_for_each(rdev
, mddev
) {
6159 sector_t avail
= rdev
->sectors
;
6161 if (fit
&& (num_sectors
== 0 || num_sectors
> avail
))
6162 num_sectors
= avail
;
6163 if (avail
< num_sectors
)
6166 rv
= mddev
->pers
->resize(mddev
, num_sectors
);
6168 revalidate_disk(mddev
->gendisk
);
6172 static int update_raid_disks(struct mddev
*mddev
, int raid_disks
)
6175 struct md_rdev
*rdev
;
6176 /* change the number of raid disks */
6177 if (mddev
->pers
->check_reshape
== NULL
)
6179 if (raid_disks
<= 0 ||
6180 (mddev
->max_disks
&& raid_disks
>= mddev
->max_disks
))
6182 if (mddev
->sync_thread
|| mddev
->reshape_position
!= MaxSector
)
6185 rdev_for_each(rdev
, mddev
) {
6186 if (mddev
->raid_disks
< raid_disks
&&
6187 rdev
->data_offset
< rdev
->new_data_offset
)
6189 if (mddev
->raid_disks
> raid_disks
&&
6190 rdev
->data_offset
> rdev
->new_data_offset
)
6194 mddev
->delta_disks
= raid_disks
- mddev
->raid_disks
;
6195 if (mddev
->delta_disks
< 0)
6196 mddev
->reshape_backwards
= 1;
6197 else if (mddev
->delta_disks
> 0)
6198 mddev
->reshape_backwards
= 0;
6200 rv
= mddev
->pers
->check_reshape(mddev
);
6202 mddev
->delta_disks
= 0;
6203 mddev
->reshape_backwards
= 0;
6210 * update_array_info is used to change the configuration of an
6212 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
6213 * fields in the info are checked against the array.
6214 * Any differences that cannot be handled will cause an error.
6215 * Normally, only one change can be managed at a time.
6217 static int update_array_info(struct mddev
*mddev
, mdu_array_info_t
*info
)
6223 /* calculate expected state,ignoring low bits */
6224 if (mddev
->bitmap
&& mddev
->bitmap_info
.offset
)
6225 state
|= (1 << MD_SB_BITMAP_PRESENT
);
6227 if (mddev
->major_version
!= info
->major_version
||
6228 mddev
->minor_version
!= info
->minor_version
||
6229 /* mddev->patch_version != info->patch_version || */
6230 mddev
->ctime
!= info
->ctime
||
6231 mddev
->level
!= info
->level
||
6232 /* mddev->layout != info->layout || */
6233 !mddev
->persistent
!= info
->not_persistent
||
6234 mddev
->chunk_sectors
!= info
->chunk_size
>> 9 ||
6235 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
6236 ((state
^info
->state
) & 0xfffffe00)
6239 /* Check there is only one change */
6240 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6242 if (mddev
->raid_disks
!= info
->raid_disks
)
6244 if (mddev
->layout
!= info
->layout
)
6246 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
))
6253 if (mddev
->layout
!= info
->layout
) {
6255 * we don't need to do anything at the md level, the
6256 * personality will take care of it all.
6258 if (mddev
->pers
->check_reshape
== NULL
)
6261 mddev
->new_layout
= info
->layout
;
6262 rv
= mddev
->pers
->check_reshape(mddev
);
6264 mddev
->new_layout
= mddev
->layout
;
6268 if (info
->size
>= 0 && mddev
->dev_sectors
/ 2 != info
->size
)
6269 rv
= update_size(mddev
, (sector_t
)info
->size
* 2);
6271 if (mddev
->raid_disks
!= info
->raid_disks
)
6272 rv
= update_raid_disks(mddev
, info
->raid_disks
);
6274 if ((state
^ info
->state
) & (1<<MD_SB_BITMAP_PRESENT
)) {
6275 if (mddev
->pers
->quiesce
== NULL
)
6277 if (mddev
->recovery
|| mddev
->sync_thread
)
6279 if (info
->state
& (1<<MD_SB_BITMAP_PRESENT
)) {
6280 /* add the bitmap */
6283 if (mddev
->bitmap_info
.default_offset
== 0)
6285 mddev
->bitmap_info
.offset
=
6286 mddev
->bitmap_info
.default_offset
;
6287 mddev
->bitmap_info
.space
=
6288 mddev
->bitmap_info
.default_space
;
6289 mddev
->pers
->quiesce(mddev
, 1);
6290 rv
= bitmap_create(mddev
);
6292 rv
= bitmap_load(mddev
);
6294 bitmap_destroy(mddev
);
6295 mddev
->pers
->quiesce(mddev
, 0);
6297 /* remove the bitmap */
6300 if (mddev
->bitmap
->storage
.file
)
6302 mddev
->pers
->quiesce(mddev
, 1);
6303 bitmap_destroy(mddev
);
6304 mddev
->pers
->quiesce(mddev
, 0);
6305 mddev
->bitmap_info
.offset
= 0;
6308 md_update_sb(mddev
, 1);
6312 static int set_disk_faulty(struct mddev
*mddev
, dev_t dev
)
6314 struct md_rdev
*rdev
;
6317 if (mddev
->pers
== NULL
)
6321 rdev
= find_rdev_rcu(mddev
, dev
);
6325 md_error(mddev
, rdev
);
6326 if (!test_bit(Faulty
, &rdev
->flags
))
6334 * We have a problem here : there is no easy way to give a CHS
6335 * virtual geometry. We currently pretend that we have a 2 heads
6336 * 4 sectors (with a BIG number of cylinders...). This drives
6337 * dosfs just mad... ;-)
6339 static int md_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
6341 struct mddev
*mddev
= bdev
->bd_disk
->private_data
;
6345 geo
->cylinders
= mddev
->array_sectors
/ 8;
6349 static inline bool md_ioctl_valid(unsigned int cmd
)
6354 case GET_ARRAY_INFO
:
6355 case GET_BITMAP_FILE
:
6358 case HOT_REMOVE_DISK
:
6359 case PRINT_RAID_DEBUG
:
6362 case RESTART_ARRAY_RW
:
6364 case SET_ARRAY_INFO
:
6365 case SET_BITMAP_FILE
:
6366 case SET_DISK_FAULTY
:
6375 static int md_ioctl(struct block_device
*bdev
, fmode_t mode
,
6376 unsigned int cmd
, unsigned long arg
)
6379 void __user
*argp
= (void __user
*)arg
;
6380 struct mddev
*mddev
= NULL
;
6383 if (!md_ioctl_valid(cmd
))
6388 case GET_ARRAY_INFO
:
6392 if (!capable(CAP_SYS_ADMIN
))
6397 * Commands dealing with the RAID driver but not any
6402 err
= get_version(argp
);
6405 case PRINT_RAID_DEBUG
:
6413 autostart_arrays(arg
);
6420 * Commands creating/starting a new array:
6423 mddev
= bdev
->bd_disk
->private_data
;
6430 /* Some actions do not requires the mutex */
6432 case GET_ARRAY_INFO
:
6433 if (!mddev
->raid_disks
&& !mddev
->external
)
6436 err
= get_array_info(mddev
, argp
);
6440 if (!mddev
->raid_disks
&& !mddev
->external
)
6443 err
= get_disk_info(mddev
, argp
);
6446 case SET_DISK_FAULTY
:
6447 err
= set_disk_faulty(mddev
, new_decode_dev(arg
));
6451 if (cmd
== ADD_NEW_DISK
)
6452 /* need to ensure md_delayed_delete() has completed */
6453 flush_workqueue(md_misc_wq
);
6455 if (cmd
== HOT_REMOVE_DISK
)
6456 /* need to ensure recovery thread has run */
6457 wait_event_interruptible_timeout(mddev
->sb_wait
,
6458 !test_bit(MD_RECOVERY_NEEDED
,
6460 msecs_to_jiffies(5000));
6461 if (cmd
== STOP_ARRAY
|| cmd
== STOP_ARRAY_RO
) {
6462 /* Need to flush page cache, and ensure no-one else opens
6465 mutex_lock(&mddev
->open_mutex
);
6466 if (atomic_read(&mddev
->openers
) > 1) {
6467 mutex_unlock(&mddev
->open_mutex
);
6471 set_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6472 mutex_unlock(&mddev
->open_mutex
);
6473 sync_blockdev(bdev
);
6475 err
= mddev_lock(mddev
);
6478 "md: ioctl lock interrupted, reason %d, cmd %d\n",
6483 if (cmd
== SET_ARRAY_INFO
) {
6484 mdu_array_info_t info
;
6486 memset(&info
, 0, sizeof(info
));
6487 else if (copy_from_user(&info
, argp
, sizeof(info
))) {
6492 err
= update_array_info(mddev
, &info
);
6494 printk(KERN_WARNING
"md: couldn't update"
6495 " array info. %d\n", err
);
6500 if (!list_empty(&mddev
->disks
)) {
6502 "md: array %s already has disks!\n",
6507 if (mddev
->raid_disks
) {
6509 "md: array %s already initialised!\n",
6514 err
= set_array_info(mddev
, &info
);
6516 printk(KERN_WARNING
"md: couldn't set"
6517 " array info. %d\n", err
);
6524 * Commands querying/configuring an existing array:
6526 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
6527 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
6528 if ((!mddev
->raid_disks
&& !mddev
->external
)
6529 && cmd
!= ADD_NEW_DISK
&& cmd
!= STOP_ARRAY
6530 && cmd
!= RUN_ARRAY
&& cmd
!= SET_BITMAP_FILE
6531 && cmd
!= GET_BITMAP_FILE
) {
6537 * Commands even a read-only array can execute:
6540 case GET_BITMAP_FILE
:
6541 err
= get_bitmap_file(mddev
, argp
);
6544 case RESTART_ARRAY_RW
:
6545 err
= restart_array(mddev
);
6549 err
= do_md_stop(mddev
, 0, bdev
);
6553 err
= md_set_readonly(mddev
, bdev
);
6556 case HOT_REMOVE_DISK
:
6557 err
= hot_remove_disk(mddev
, new_decode_dev(arg
));
6561 /* We can support ADD_NEW_DISK on read-only arrays
6562 * on if we are re-adding a preexisting device.
6563 * So require mddev->pers and MD_DISK_SYNC.
6566 mdu_disk_info_t info
;
6567 if (copy_from_user(&info
, argp
, sizeof(info
)))
6569 else if (!(info
.state
& (1<<MD_DISK_SYNC
)))
6570 /* Need to clear read-only for this */
6573 err
= add_new_disk(mddev
, &info
);
6579 if (get_user(ro
, (int __user
*)(arg
))) {
6585 /* if the bdev is going readonly the value of mddev->ro
6586 * does not matter, no writes are coming
6591 /* are we are already prepared for writes? */
6595 /* transitioning to readauto need only happen for
6596 * arrays that call md_write_start
6599 err
= restart_array(mddev
);
6602 set_disk_ro(mddev
->gendisk
, 0);
6609 * The remaining ioctls are changing the state of the
6610 * superblock, so we do not allow them on read-only arrays.
6611 * However non-MD ioctls (e.g. get-size) will still come through
6612 * here and hit the 'default' below, so only disallow
6613 * 'md' ioctls, and switch to rw mode if started auto-readonly.
6615 if (_IOC_TYPE(cmd
) == MD_MAJOR
&& mddev
->ro
&& mddev
->pers
) {
6616 if (mddev
->ro
== 2) {
6618 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
6619 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6620 /* mddev_unlock will wake thread */
6621 /* If a device failed while we were read-only, we
6622 * need to make sure the metadata is updated now.
6624 if (test_bit(MD_CHANGE_DEVS
, &mddev
->flags
)) {
6625 mddev_unlock(mddev
);
6626 wait_event(mddev
->sb_wait
,
6627 !test_bit(MD_CHANGE_DEVS
, &mddev
->flags
) &&
6628 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
6629 mddev_lock_nointr(mddev
);
6640 mdu_disk_info_t info
;
6641 if (copy_from_user(&info
, argp
, sizeof(info
)))
6644 err
= add_new_disk(mddev
, &info
);
6649 err
= hot_add_disk(mddev
, new_decode_dev(arg
));
6653 err
= do_md_run(mddev
);
6656 case SET_BITMAP_FILE
:
6657 err
= set_bitmap_file(mddev
, (int)arg
);
6667 if (mddev
->hold_active
== UNTIL_IOCTL
&&
6669 mddev
->hold_active
= 0;
6670 mddev_unlock(mddev
);
6679 #ifdef CONFIG_COMPAT
6680 static int md_compat_ioctl(struct block_device
*bdev
, fmode_t mode
,
6681 unsigned int cmd
, unsigned long arg
)
6684 case HOT_REMOVE_DISK
:
6686 case SET_DISK_FAULTY
:
6687 case SET_BITMAP_FILE
:
6688 /* These take in integer arg, do not convert */
6691 arg
= (unsigned long)compat_ptr(arg
);
6695 return md_ioctl(bdev
, mode
, cmd
, arg
);
6697 #endif /* CONFIG_COMPAT */
6699 static int md_open(struct block_device
*bdev
, fmode_t mode
)
6702 * Succeed if we can lock the mddev, which confirms that
6703 * it isn't being stopped right now.
6705 struct mddev
*mddev
= mddev_find(bdev
->bd_dev
);
6711 if (mddev
->gendisk
!= bdev
->bd_disk
) {
6712 /* we are racing with mddev_put which is discarding this
6716 /* Wait until bdev->bd_disk is definitely gone */
6717 flush_workqueue(md_misc_wq
);
6718 /* Then retry the open from the top */
6719 return -ERESTARTSYS
;
6721 BUG_ON(mddev
!= bdev
->bd_disk
->private_data
);
6723 if ((err
= mutex_lock_interruptible(&mddev
->open_mutex
)))
6727 atomic_inc(&mddev
->openers
);
6728 clear_bit(MD_STILL_CLOSED
, &mddev
->flags
);
6729 mutex_unlock(&mddev
->open_mutex
);
6731 check_disk_change(bdev
);
6736 static void md_release(struct gendisk
*disk
, fmode_t mode
)
6738 struct mddev
*mddev
= disk
->private_data
;
6741 atomic_dec(&mddev
->openers
);
6745 static int md_media_changed(struct gendisk
*disk
)
6747 struct mddev
*mddev
= disk
->private_data
;
6749 return mddev
->changed
;
6752 static int md_revalidate(struct gendisk
*disk
)
6754 struct mddev
*mddev
= disk
->private_data
;
6759 static const struct block_device_operations md_fops
=
6761 .owner
= THIS_MODULE
,
6763 .release
= md_release
,
6765 #ifdef CONFIG_COMPAT
6766 .compat_ioctl
= md_compat_ioctl
,
6768 .getgeo
= md_getgeo
,
6769 .media_changed
= md_media_changed
,
6770 .revalidate_disk
= md_revalidate
,
6773 static int md_thread(void * arg
)
6775 struct md_thread
*thread
= arg
;
6778 * md_thread is a 'system-thread', it's priority should be very
6779 * high. We avoid resource deadlocks individually in each
6780 * raid personality. (RAID5 does preallocation) We also use RR and
6781 * the very same RT priority as kswapd, thus we will never get
6782 * into a priority inversion deadlock.
6784 * we definitely have to have equal or higher priority than
6785 * bdflush, otherwise bdflush will deadlock if there are too
6786 * many dirty RAID5 blocks.
6789 allow_signal(SIGKILL
);
6790 while (!kthread_should_stop()) {
6792 /* We need to wait INTERRUPTIBLE so that
6793 * we don't add to the load-average.
6794 * That means we need to be sure no signals are
6797 if (signal_pending(current
))
6798 flush_signals(current
);
6800 wait_event_interruptible_timeout
6802 test_bit(THREAD_WAKEUP
, &thread
->flags
)
6803 || kthread_should_stop(),
6806 clear_bit(THREAD_WAKEUP
, &thread
->flags
);
6807 if (!kthread_should_stop())
6808 thread
->run(thread
);
6814 void md_wakeup_thread(struct md_thread
*thread
)
6817 pr_debug("md: waking up MD thread %s.\n", thread
->tsk
->comm
);
6818 set_bit(THREAD_WAKEUP
, &thread
->flags
);
6819 wake_up(&thread
->wqueue
);
6823 struct md_thread
*md_register_thread(void (*run
) (struct md_thread
*),
6824 struct mddev
*mddev
, const char *name
)
6826 struct md_thread
*thread
;
6828 thread
= kzalloc(sizeof(struct md_thread
), GFP_KERNEL
);
6832 init_waitqueue_head(&thread
->wqueue
);
6835 thread
->mddev
= mddev
;
6836 thread
->timeout
= MAX_SCHEDULE_TIMEOUT
;
6837 thread
->tsk
= kthread_run(md_thread
, thread
,
6839 mdname(thread
->mddev
),
6841 if (IS_ERR(thread
->tsk
)) {
6848 void md_unregister_thread(struct md_thread
**threadp
)
6850 struct md_thread
*thread
= *threadp
;
6853 pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread
->tsk
));
6854 /* Locking ensures that mddev_unlock does not wake_up a
6855 * non-existent thread
6857 spin_lock(&pers_lock
);
6859 spin_unlock(&pers_lock
);
6861 kthread_stop(thread
->tsk
);
6865 void md_error(struct mddev
*mddev
, struct md_rdev
*rdev
)
6872 if (!rdev
|| test_bit(Faulty
, &rdev
->flags
))
6875 if (!mddev
->pers
|| !mddev
->pers
->error_handler
)
6877 mddev
->pers
->error_handler(mddev
,rdev
);
6878 if (mddev
->degraded
)
6879 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
6880 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
6881 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
6882 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
6883 md_wakeup_thread(mddev
->thread
);
6884 if (mddev
->event_work
.func
)
6885 queue_work(md_misc_wq
, &mddev
->event_work
);
6886 md_new_event_inintr(mddev
);
6889 /* seq_file implementation /proc/mdstat */
6891 static void status_unused(struct seq_file
*seq
)
6894 struct md_rdev
*rdev
;
6896 seq_printf(seq
, "unused devices: ");
6898 list_for_each_entry(rdev
, &pending_raid_disks
, same_set
) {
6899 char b
[BDEVNAME_SIZE
];
6901 seq_printf(seq
, "%s ",
6902 bdevname(rdev
->bdev
,b
));
6905 seq_printf(seq
, "<none>");
6907 seq_printf(seq
, "\n");
6911 static void status_resync(struct seq_file
*seq
, struct mddev
* mddev
)
6913 sector_t max_sectors
, resync
, res
;
6914 unsigned long dt
, db
;
6917 unsigned int per_milli
;
6919 if (mddev
->curr_resync
<= 3)
6922 resync
= mddev
->curr_resync
6923 - atomic_read(&mddev
->recovery_active
);
6925 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ||
6926 test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
6927 max_sectors
= mddev
->resync_max_sectors
;
6929 max_sectors
= mddev
->dev_sectors
;
6932 * Should not happen.
6938 /* Pick 'scale' such that (resync>>scale)*1000 will fit
6939 * in a sector_t, and (max_sectors>>scale) will fit in a
6940 * u32, as those are the requirements for sector_div.
6941 * Thus 'scale' must be at least 10
6944 if (sizeof(sector_t
) > sizeof(unsigned long)) {
6945 while ( max_sectors
/2 > (1ULL<<(scale
+32)))
6948 res
= (resync
>>scale
)*1000;
6949 sector_div(res
, (u32
)((max_sectors
>>scale
)+1));
6953 int i
, x
= per_milli
/50, y
= 20-x
;
6954 seq_printf(seq
, "[");
6955 for (i
= 0; i
< x
; i
++)
6956 seq_printf(seq
, "=");
6957 seq_printf(seq
, ">");
6958 for (i
= 0; i
< y
; i
++)
6959 seq_printf(seq
, ".");
6960 seq_printf(seq
, "] ");
6962 seq_printf(seq
, " %s =%3u.%u%% (%llu/%llu)",
6963 (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
)?
6965 (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)?
6967 (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) ?
6968 "resync" : "recovery"))),
6969 per_milli
/10, per_milli
% 10,
6970 (unsigned long long) resync
/2,
6971 (unsigned long long) max_sectors
/2);
6974 * dt: time from mark until now
6975 * db: blocks written from mark until now
6976 * rt: remaining time
6978 * rt is a sector_t, so could be 32bit or 64bit.
6979 * So we divide before multiply in case it is 32bit and close
6981 * We scale the divisor (db) by 32 to avoid losing precision
6982 * near the end of resync when the number of remaining sectors
6984 * We then divide rt by 32 after multiplying by db to compensate.
6985 * The '+1' avoids division by zero if db is very small.
6987 dt
= ((jiffies
- mddev
->resync_mark
) / HZ
);
6989 db
= (mddev
->curr_mark_cnt
- atomic_read(&mddev
->recovery_active
))
6990 - mddev
->resync_mark_cnt
;
6992 rt
= max_sectors
- resync
; /* number of remaining sectors */
6993 sector_div(rt
, db
/32+1);
6997 seq_printf(seq
, " finish=%lu.%lumin", (unsigned long)rt
/ 60,
6998 ((unsigned long)rt
% 60)/6);
7000 seq_printf(seq
, " speed=%ldK/sec", db
/2/dt
);
7003 static void *md_seq_start(struct seq_file
*seq
, loff_t
*pos
)
7005 struct list_head
*tmp
;
7007 struct mddev
*mddev
;
7015 spin_lock(&all_mddevs_lock
);
7016 list_for_each(tmp
,&all_mddevs
)
7018 mddev
= list_entry(tmp
, struct mddev
, all_mddevs
);
7020 spin_unlock(&all_mddevs_lock
);
7023 spin_unlock(&all_mddevs_lock
);
7025 return (void*)2;/* tail */
7029 static void *md_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
7031 struct list_head
*tmp
;
7032 struct mddev
*next_mddev
, *mddev
= v
;
7038 spin_lock(&all_mddevs_lock
);
7040 tmp
= all_mddevs
.next
;
7042 tmp
= mddev
->all_mddevs
.next
;
7043 if (tmp
!= &all_mddevs
)
7044 next_mddev
= mddev_get(list_entry(tmp
,struct mddev
,all_mddevs
));
7046 next_mddev
= (void*)2;
7049 spin_unlock(&all_mddevs_lock
);
7057 static void md_seq_stop(struct seq_file
*seq
, void *v
)
7059 struct mddev
*mddev
= v
;
7061 if (mddev
&& v
!= (void*)1 && v
!= (void*)2)
7065 static int md_seq_show(struct seq_file
*seq
, void *v
)
7067 struct mddev
*mddev
= v
;
7069 struct md_rdev
*rdev
;
7071 if (v
== (void*)1) {
7072 struct md_personality
*pers
;
7073 seq_printf(seq
, "Personalities : ");
7074 spin_lock(&pers_lock
);
7075 list_for_each_entry(pers
, &pers_list
, list
)
7076 seq_printf(seq
, "[%s] ", pers
->name
);
7078 spin_unlock(&pers_lock
);
7079 seq_printf(seq
, "\n");
7080 seq
->poll_event
= atomic_read(&md_event_count
);
7083 if (v
== (void*)2) {
7088 if (mddev_lock(mddev
) < 0)
7091 if (mddev
->pers
|| mddev
->raid_disks
|| !list_empty(&mddev
->disks
)) {
7092 seq_printf(seq
, "%s : %sactive", mdname(mddev
),
7093 mddev
->pers
? "" : "in");
7096 seq_printf(seq
, " (read-only)");
7098 seq_printf(seq
, " (auto-read-only)");
7099 seq_printf(seq
, " %s", mddev
->pers
->name
);
7103 rdev_for_each(rdev
, mddev
) {
7104 char b
[BDEVNAME_SIZE
];
7105 seq_printf(seq
, " %s[%d]",
7106 bdevname(rdev
->bdev
,b
), rdev
->desc_nr
);
7107 if (test_bit(WriteMostly
, &rdev
->flags
))
7108 seq_printf(seq
, "(W)");
7109 if (test_bit(Faulty
, &rdev
->flags
)) {
7110 seq_printf(seq
, "(F)");
7113 if (rdev
->raid_disk
< 0)
7114 seq_printf(seq
, "(S)"); /* spare */
7115 if (test_bit(Replacement
, &rdev
->flags
))
7116 seq_printf(seq
, "(R)");
7117 sectors
+= rdev
->sectors
;
7120 if (!list_empty(&mddev
->disks
)) {
7122 seq_printf(seq
, "\n %llu blocks",
7123 (unsigned long long)
7124 mddev
->array_sectors
/ 2);
7126 seq_printf(seq
, "\n %llu blocks",
7127 (unsigned long long)sectors
/ 2);
7129 if (mddev
->persistent
) {
7130 if (mddev
->major_version
!= 0 ||
7131 mddev
->minor_version
!= 90) {
7132 seq_printf(seq
," super %d.%d",
7133 mddev
->major_version
,
7134 mddev
->minor_version
);
7136 } else if (mddev
->external
)
7137 seq_printf(seq
, " super external:%s",
7138 mddev
->metadata_type
);
7140 seq_printf(seq
, " super non-persistent");
7143 mddev
->pers
->status(seq
, mddev
);
7144 seq_printf(seq
, "\n ");
7145 if (mddev
->pers
->sync_request
) {
7146 if (mddev
->curr_resync
> 2) {
7147 status_resync(seq
, mddev
);
7148 seq_printf(seq
, "\n ");
7149 } else if (mddev
->curr_resync
>= 1)
7150 seq_printf(seq
, "\tresync=DELAYED\n ");
7151 else if (mddev
->recovery_cp
< MaxSector
)
7152 seq_printf(seq
, "\tresync=PENDING\n ");
7155 seq_printf(seq
, "\n ");
7157 bitmap_status(seq
, mddev
->bitmap
);
7159 seq_printf(seq
, "\n");
7161 mddev_unlock(mddev
);
7166 static const struct seq_operations md_seq_ops
= {
7167 .start
= md_seq_start
,
7168 .next
= md_seq_next
,
7169 .stop
= md_seq_stop
,
7170 .show
= md_seq_show
,
7173 static int md_seq_open(struct inode
*inode
, struct file
*file
)
7175 struct seq_file
*seq
;
7178 error
= seq_open(file
, &md_seq_ops
);
7182 seq
= file
->private_data
;
7183 seq
->poll_event
= atomic_read(&md_event_count
);
7187 static unsigned int mdstat_poll(struct file
*filp
, poll_table
*wait
)
7189 struct seq_file
*seq
= filp
->private_data
;
7192 poll_wait(filp
, &md_event_waiters
, wait
);
7194 /* always allow read */
7195 mask
= POLLIN
| POLLRDNORM
;
7197 if (seq
->poll_event
!= atomic_read(&md_event_count
))
7198 mask
|= POLLERR
| POLLPRI
;
7202 static const struct file_operations md_seq_fops
= {
7203 .owner
= THIS_MODULE
,
7204 .open
= md_seq_open
,
7206 .llseek
= seq_lseek
,
7207 .release
= seq_release_private
,
7208 .poll
= mdstat_poll
,
7211 int register_md_personality(struct md_personality
*p
)
7213 spin_lock(&pers_lock
);
7214 list_add_tail(&p
->list
, &pers_list
);
7215 printk(KERN_INFO
"md: %s personality registered for level %d\n", p
->name
, p
->level
);
7216 spin_unlock(&pers_lock
);
7220 int unregister_md_personality(struct md_personality
*p
)
7222 printk(KERN_INFO
"md: %s personality unregistered\n", p
->name
);
7223 spin_lock(&pers_lock
);
7224 list_del_init(&p
->list
);
7225 spin_unlock(&pers_lock
);
7229 static int is_mddev_idle(struct mddev
*mddev
, int init
)
7231 struct md_rdev
* rdev
;
7237 rdev_for_each_rcu(rdev
, mddev
) {
7238 struct gendisk
*disk
= rdev
->bdev
->bd_contains
->bd_disk
;
7239 curr_events
= (int)part_stat_read(&disk
->part0
, sectors
[0]) +
7240 (int)part_stat_read(&disk
->part0
, sectors
[1]) -
7241 atomic_read(&disk
->sync_io
);
7242 /* sync IO will cause sync_io to increase before the disk_stats
7243 * as sync_io is counted when a request starts, and
7244 * disk_stats is counted when it completes.
7245 * So resync activity will cause curr_events to be smaller than
7246 * when there was no such activity.
7247 * non-sync IO will cause disk_stat to increase without
7248 * increasing sync_io so curr_events will (eventually)
7249 * be larger than it was before. Once it becomes
7250 * substantially larger, the test below will cause
7251 * the array to appear non-idle, and resync will slow
7253 * If there is a lot of outstanding resync activity when
7254 * we set last_event to curr_events, then all that activity
7255 * completing might cause the array to appear non-idle
7256 * and resync will be slowed down even though there might
7257 * not have been non-resync activity. This will only
7258 * happen once though. 'last_events' will soon reflect
7259 * the state where there is little or no outstanding
7260 * resync requests, and further resync activity will
7261 * always make curr_events less than last_events.
7264 if (init
|| curr_events
- rdev
->last_events
> 64) {
7265 rdev
->last_events
= curr_events
;
7273 void md_done_sync(struct mddev
*mddev
, int blocks
, int ok
)
7275 /* another "blocks" (512byte) blocks have been synced */
7276 atomic_sub(blocks
, &mddev
->recovery_active
);
7277 wake_up(&mddev
->recovery_wait
);
7279 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7280 set_bit(MD_RECOVERY_ERROR
, &mddev
->recovery
);
7281 md_wakeup_thread(mddev
->thread
);
7282 // stop recovery, signal do_sync ....
7287 /* md_write_start(mddev, bi)
7288 * If we need to update some array metadata (e.g. 'active' flag
7289 * in superblock) before writing, schedule a superblock update
7290 * and wait for it to complete.
7292 void md_write_start(struct mddev
*mddev
, struct bio
*bi
)
7295 if (bio_data_dir(bi
) != WRITE
)
7298 BUG_ON(mddev
->ro
== 1);
7299 if (mddev
->ro
== 2) {
7300 /* need to switch to read/write */
7302 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7303 md_wakeup_thread(mddev
->thread
);
7304 md_wakeup_thread(mddev
->sync_thread
);
7307 atomic_inc(&mddev
->writes_pending
);
7308 if (mddev
->safemode
== 1)
7309 mddev
->safemode
= 0;
7310 if (mddev
->in_sync
) {
7311 spin_lock_irq(&mddev
->write_lock
);
7312 if (mddev
->in_sync
) {
7314 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7315 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7316 md_wakeup_thread(mddev
->thread
);
7319 spin_unlock_irq(&mddev
->write_lock
);
7322 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7323 wait_event(mddev
->sb_wait
,
7324 !test_bit(MD_CHANGE_PENDING
, &mddev
->flags
));
7327 void md_write_end(struct mddev
*mddev
)
7329 if (atomic_dec_and_test(&mddev
->writes_pending
)) {
7330 if (mddev
->safemode
== 2)
7331 md_wakeup_thread(mddev
->thread
);
7332 else if (mddev
->safemode_delay
)
7333 mod_timer(&mddev
->safemode_timer
, jiffies
+ mddev
->safemode_delay
);
7337 /* md_allow_write(mddev)
7338 * Calling this ensures that the array is marked 'active' so that writes
7339 * may proceed without blocking. It is important to call this before
7340 * attempting a GFP_KERNEL allocation while holding the mddev lock.
7341 * Must be called with mddev_lock held.
7343 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
7344 * is dropped, so return -EAGAIN after notifying userspace.
7346 int md_allow_write(struct mddev
*mddev
)
7352 if (!mddev
->pers
->sync_request
)
7355 spin_lock_irq(&mddev
->write_lock
);
7356 if (mddev
->in_sync
) {
7358 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7359 set_bit(MD_CHANGE_PENDING
, &mddev
->flags
);
7360 if (mddev
->safemode_delay
&&
7361 mddev
->safemode
== 0)
7362 mddev
->safemode
= 1;
7363 spin_unlock_irq(&mddev
->write_lock
);
7364 md_update_sb(mddev
, 0);
7365 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7367 spin_unlock_irq(&mddev
->write_lock
);
7369 if (test_bit(MD_CHANGE_PENDING
, &mddev
->flags
))
7374 EXPORT_SYMBOL_GPL(md_allow_write
);
7376 #define SYNC_MARKS 10
7377 #define SYNC_MARK_STEP (3*HZ)
7378 #define UPDATE_FREQUENCY (5*60*HZ)
7379 void md_do_sync(struct md_thread
*thread
)
7381 struct mddev
*mddev
= thread
->mddev
;
7382 struct mddev
*mddev2
;
7383 unsigned int currspeed
= 0,
7385 sector_t max_sectors
,j
, io_sectors
;
7386 unsigned long mark
[SYNC_MARKS
];
7387 unsigned long update_time
;
7388 sector_t mark_cnt
[SYNC_MARKS
];
7390 struct list_head
*tmp
;
7391 sector_t last_check
;
7393 struct md_rdev
*rdev
;
7394 char *desc
, *action
= NULL
;
7395 struct blk_plug plug
;
7397 /* just incase thread restarts... */
7398 if (test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
))
7400 if (mddev
->ro
) /* never try to sync a read-only array */
7403 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7404 if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
)) {
7405 desc
= "data-check";
7407 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7408 desc
= "requested-resync";
7412 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7417 mddev
->last_sync_action
= action
?: desc
;
7419 /* we overload curr_resync somewhat here.
7420 * 0 == not engaged in resync at all
7421 * 2 == checking that there is no conflict with another sync
7422 * 1 == like 2, but have yielded to allow conflicting resync to
7424 * other == active in resync - this many blocks
7426 * Before starting a resync we must have set curr_resync to
7427 * 2, and then checked that every "conflicting" array has curr_resync
7428 * less than ours. When we find one that is the same or higher
7429 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
7430 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
7431 * This will mean we have to start checking from the beginning again.
7436 mddev
->curr_resync
= 2;
7439 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7441 for_each_mddev(mddev2
, tmp
) {
7442 if (mddev2
== mddev
)
7444 if (!mddev
->parallel_resync
7445 && mddev2
->curr_resync
7446 && match_mddev_units(mddev
, mddev2
)) {
7448 if (mddev
< mddev2
&& mddev
->curr_resync
== 2) {
7449 /* arbitrarily yield */
7450 mddev
->curr_resync
= 1;
7451 wake_up(&resync_wait
);
7453 if (mddev
> mddev2
&& mddev
->curr_resync
== 1)
7454 /* no need to wait here, we can wait the next
7455 * time 'round when curr_resync == 2
7458 /* We need to wait 'interruptible' so as not to
7459 * contribute to the load average, and not to
7460 * be caught by 'softlockup'
7462 prepare_to_wait(&resync_wait
, &wq
, TASK_INTERRUPTIBLE
);
7463 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7464 mddev2
->curr_resync
>= mddev
->curr_resync
) {
7465 printk(KERN_INFO
"md: delaying %s of %s"
7466 " until %s has finished (they"
7467 " share one or more physical units)\n",
7468 desc
, mdname(mddev
), mdname(mddev2
));
7470 if (signal_pending(current
))
7471 flush_signals(current
);
7473 finish_wait(&resync_wait
, &wq
);
7476 finish_wait(&resync_wait
, &wq
);
7479 } while (mddev
->curr_resync
< 2);
7482 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7483 /* resync follows the size requested by the personality,
7484 * which defaults to physical size, but can be virtual size
7486 max_sectors
= mddev
->resync_max_sectors
;
7487 atomic64_set(&mddev
->resync_mismatches
, 0);
7488 /* we don't use the checkpoint if there's a bitmap */
7489 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7490 j
= mddev
->resync_min
;
7491 else if (!mddev
->bitmap
)
7492 j
= mddev
->recovery_cp
;
7494 } else if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
7495 max_sectors
= mddev
->resync_max_sectors
;
7497 /* recovery follows the physical size of devices */
7498 max_sectors
= mddev
->dev_sectors
;
7501 rdev_for_each_rcu(rdev
, mddev
)
7502 if (rdev
->raid_disk
>= 0 &&
7503 !test_bit(Faulty
, &rdev
->flags
) &&
7504 !test_bit(In_sync
, &rdev
->flags
) &&
7505 rdev
->recovery_offset
< j
)
7506 j
= rdev
->recovery_offset
;
7510 printk(KERN_INFO
"md: %s of RAID array %s\n", desc
, mdname(mddev
));
7511 printk(KERN_INFO
"md: minimum _guaranteed_ speed:"
7512 " %d KB/sec/disk.\n", speed_min(mddev
));
7513 printk(KERN_INFO
"md: using maximum available idle IO bandwidth "
7514 "(but not more than %d KB/sec) for %s.\n",
7515 speed_max(mddev
), desc
);
7517 is_mddev_idle(mddev
, 1); /* this initializes IO event counters */
7520 for (m
= 0; m
< SYNC_MARKS
; m
++) {
7522 mark_cnt
[m
] = io_sectors
;
7525 mddev
->resync_mark
= mark
[last_mark
];
7526 mddev
->resync_mark_cnt
= mark_cnt
[last_mark
];
7529 * Tune reconstruction:
7531 window
= 32*(PAGE_SIZE
/512);
7532 printk(KERN_INFO
"md: using %dk window, over a total of %lluk.\n",
7533 window
/2, (unsigned long long)max_sectors
/2);
7535 atomic_set(&mddev
->recovery_active
, 0);
7540 "md: resuming %s of %s from checkpoint.\n",
7541 desc
, mdname(mddev
));
7542 mddev
->curr_resync
= j
;
7544 mddev
->curr_resync
= 3; /* no longer delayed */
7545 mddev
->curr_resync_completed
= j
;
7546 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7547 md_new_event(mddev
);
7548 update_time
= jiffies
;
7550 blk_start_plug(&plug
);
7551 while (j
< max_sectors
) {
7556 if (!test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7557 ((mddev
->curr_resync
> mddev
->curr_resync_completed
&&
7558 (mddev
->curr_resync
- mddev
->curr_resync_completed
)
7559 > (max_sectors
>> 4)) ||
7560 time_after_eq(jiffies
, update_time
+ UPDATE_FREQUENCY
) ||
7561 (j
- mddev
->curr_resync_completed
)*2
7562 >= mddev
->resync_max
- mddev
->curr_resync_completed
7564 /* time to update curr_resync_completed */
7565 wait_event(mddev
->recovery_wait
,
7566 atomic_read(&mddev
->recovery_active
) == 0);
7567 mddev
->curr_resync_completed
= j
;
7568 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
) &&
7569 j
> mddev
->recovery_cp
)
7570 mddev
->recovery_cp
= j
;
7571 update_time
= jiffies
;
7572 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7573 sysfs_notify(&mddev
->kobj
, NULL
, "sync_completed");
7576 while (j
>= mddev
->resync_max
&&
7577 !test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7578 /* As this condition is controlled by user-space,
7579 * we can block indefinitely, so use '_interruptible'
7580 * to avoid triggering warnings.
7582 flush_signals(current
); /* just in case */
7583 wait_event_interruptible(mddev
->recovery_wait
,
7584 mddev
->resync_max
> j
7585 || test_bit(MD_RECOVERY_INTR
,
7589 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7592 sectors
= mddev
->pers
->sync_request(mddev
, j
, &skipped
,
7593 currspeed
< speed_min(mddev
));
7595 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7599 if (!skipped
) { /* actual IO requested */
7600 io_sectors
+= sectors
;
7601 atomic_add(sectors
, &mddev
->recovery_active
);
7604 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7609 mddev
->curr_resync
= j
;
7610 mddev
->curr_mark_cnt
= io_sectors
;
7611 if (last_check
== 0)
7612 /* this is the earliest that rebuild will be
7613 * visible in /proc/mdstat
7615 md_new_event(mddev
);
7617 if (last_check
+ window
> io_sectors
|| j
== max_sectors
)
7620 last_check
= io_sectors
;
7622 if (time_after_eq(jiffies
, mark
[last_mark
] + SYNC_MARK_STEP
)) {
7624 int next
= (last_mark
+1) % SYNC_MARKS
;
7626 mddev
->resync_mark
= mark
[next
];
7627 mddev
->resync_mark_cnt
= mark_cnt
[next
];
7628 mark
[next
] = jiffies
;
7629 mark_cnt
[next
] = io_sectors
- atomic_read(&mddev
->recovery_active
);
7633 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7637 * this loop exits only if either when we are slower than
7638 * the 'hard' speed limit, or the system was IO-idle for
7640 * the system might be non-idle CPU-wise, but we only care
7641 * about not overloading the IO subsystem. (things like an
7642 * e2fsck being done on the RAID array should execute fast)
7646 currspeed
= ((unsigned long)(io_sectors
-mddev
->resync_mark_cnt
))/2
7647 /((jiffies
-mddev
->resync_mark
)/HZ
+1) +1;
7649 if (currspeed
> speed_min(mddev
)) {
7650 if ((currspeed
> speed_max(mddev
)) ||
7651 !is_mddev_idle(mddev
, 0)) {
7657 printk(KERN_INFO
"md: %s: %s %s.\n",mdname(mddev
), desc
,
7658 test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)
7659 ? "interrupted" : "done");
7661 * this also signals 'finished resyncing' to md_stop
7663 blk_finish_plug(&plug
);
7664 wait_event(mddev
->recovery_wait
, !atomic_read(&mddev
->recovery_active
));
7666 /* tell personality that we are finished */
7667 mddev
->pers
->sync_request(mddev
, max_sectors
, &skipped
, 1);
7669 if (!test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
) &&
7670 mddev
->curr_resync
> 2) {
7671 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
7672 if (test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7673 if (mddev
->curr_resync
>= mddev
->recovery_cp
) {
7675 "md: checkpointing %s of %s.\n",
7676 desc
, mdname(mddev
));
7677 if (test_bit(MD_RECOVERY_ERROR
,
7679 mddev
->recovery_cp
=
7680 mddev
->curr_resync_completed
;
7682 mddev
->recovery_cp
=
7686 mddev
->recovery_cp
= MaxSector
;
7688 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
))
7689 mddev
->curr_resync
= MaxSector
;
7691 rdev_for_each_rcu(rdev
, mddev
)
7692 if (rdev
->raid_disk
>= 0 &&
7693 mddev
->delta_disks
>= 0 &&
7694 !test_bit(Faulty
, &rdev
->flags
) &&
7695 !test_bit(In_sync
, &rdev
->flags
) &&
7696 rdev
->recovery_offset
< mddev
->curr_resync
)
7697 rdev
->recovery_offset
= mddev
->curr_resync
;
7702 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7704 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
)) {
7705 /* We completed so min/max setting can be forgotten if used. */
7706 if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7707 mddev
->resync_min
= 0;
7708 mddev
->resync_max
= MaxSector
;
7709 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
7710 mddev
->resync_min
= mddev
->curr_resync_completed
;
7711 mddev
->curr_resync
= 0;
7712 wake_up(&resync_wait
);
7713 set_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7714 md_wakeup_thread(mddev
->thread
);
7717 EXPORT_SYMBOL_GPL(md_do_sync
);
7719 static int remove_and_add_spares(struct mddev
*mddev
,
7720 struct md_rdev
*this)
7722 struct md_rdev
*rdev
;
7726 rdev_for_each(rdev
, mddev
)
7727 if ((this == NULL
|| rdev
== this) &&
7728 rdev
->raid_disk
>= 0 &&
7729 !test_bit(Blocked
, &rdev
->flags
) &&
7730 (test_bit(Faulty
, &rdev
->flags
) ||
7731 ! test_bit(In_sync
, &rdev
->flags
)) &&
7732 atomic_read(&rdev
->nr_pending
)==0) {
7733 if (mddev
->pers
->hot_remove_disk(
7734 mddev
, rdev
) == 0) {
7735 sysfs_unlink_rdev(mddev
, rdev
);
7736 rdev
->raid_disk
= -1;
7740 if (removed
&& mddev
->kobj
.sd
)
7741 sysfs_notify(&mddev
->kobj
, NULL
, "degraded");
7746 rdev_for_each(rdev
, mddev
) {
7747 if (rdev
->raid_disk
>= 0 &&
7748 !test_bit(In_sync
, &rdev
->flags
) &&
7749 !test_bit(Faulty
, &rdev
->flags
))
7751 if (rdev
->raid_disk
>= 0)
7753 if (test_bit(Faulty
, &rdev
->flags
))
7756 ! (rdev
->saved_raid_disk
>= 0 &&
7757 !test_bit(Bitmap_sync
, &rdev
->flags
)))
7760 if (rdev
->saved_raid_disk
< 0)
7761 rdev
->recovery_offset
= 0;
7763 hot_add_disk(mddev
, rdev
) == 0) {
7764 if (sysfs_link_rdev(mddev
, rdev
))
7765 /* failure here is OK */;
7767 md_new_event(mddev
);
7768 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7773 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7778 * This routine is regularly called by all per-raid-array threads to
7779 * deal with generic issues like resync and super-block update.
7780 * Raid personalities that don't have a thread (linear/raid0) do not
7781 * need this as they never do any recovery or update the superblock.
7783 * It does not do any resync itself, but rather "forks" off other threads
7784 * to do that as needed.
7785 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
7786 * "->recovery" and create a thread at ->sync_thread.
7787 * When the thread finishes it sets MD_RECOVERY_DONE
7788 * and wakeups up this thread which will reap the thread and finish up.
7789 * This thread also removes any faulty devices (with nr_pending == 0).
7791 * The overall approach is:
7792 * 1/ if the superblock needs updating, update it.
7793 * 2/ If a recovery thread is running, don't do anything else.
7794 * 3/ If recovery has finished, clean up, possibly marking spares active.
7795 * 4/ If there are any faulty devices, remove them.
7796 * 5/ If array is degraded, try to add spares devices
7797 * 6/ If array has spares or is not in-sync, start a resync thread.
7799 void md_check_recovery(struct mddev
*mddev
)
7801 if (mddev
->suspended
)
7805 bitmap_daemon_work(mddev
);
7807 if (signal_pending(current
)) {
7808 if (mddev
->pers
->sync_request
&& !mddev
->external
) {
7809 printk(KERN_INFO
"md: %s in immediate safe mode\n",
7811 mddev
->safemode
= 2;
7813 flush_signals(current
);
7816 if (mddev
->ro
&& !test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
7819 (mddev
->flags
& MD_UPDATE_SB_FLAGS
& ~ (1<<MD_CHANGE_PENDING
)) ||
7820 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7821 test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
) ||
7822 (mddev
->external
== 0 && mddev
->safemode
== 1) ||
7823 (mddev
->safemode
== 2 && ! atomic_read(&mddev
->writes_pending
)
7824 && !mddev
->in_sync
&& mddev
->recovery_cp
== MaxSector
)
7828 if (mddev_trylock(mddev
)) {
7832 /* On a read-only array we can:
7833 * - remove failed devices
7834 * - add already-in_sync devices if the array itself
7836 * As we only add devices that are already in-sync,
7837 * we can activate the spares immediately.
7839 remove_and_add_spares(mddev
, NULL
);
7840 /* There is no thread, but we need to call
7841 * ->spare_active and clear saved_raid_disk
7843 md_reap_sync_thread(mddev
);
7844 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7848 if (!mddev
->external
) {
7850 spin_lock_irq(&mddev
->write_lock
);
7851 if (mddev
->safemode
&&
7852 !atomic_read(&mddev
->writes_pending
) &&
7854 mddev
->recovery_cp
== MaxSector
) {
7857 set_bit(MD_CHANGE_CLEAN
, &mddev
->flags
);
7859 if (mddev
->safemode
== 1)
7860 mddev
->safemode
= 0;
7861 spin_unlock_irq(&mddev
->write_lock
);
7863 sysfs_notify_dirent_safe(mddev
->sysfs_state
);
7866 if (mddev
->flags
& MD_UPDATE_SB_FLAGS
)
7867 md_update_sb(mddev
, 0);
7869 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) &&
7870 !test_bit(MD_RECOVERY_DONE
, &mddev
->recovery
)) {
7871 /* resync/recovery still happening */
7872 clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7875 if (mddev
->sync_thread
) {
7876 md_reap_sync_thread(mddev
);
7879 /* Set RUNNING before clearing NEEDED to avoid
7880 * any transients in the value of "sync_action".
7882 mddev
->curr_resync_completed
= 0;
7883 set_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7884 /* Clear some bits that don't mean anything, but
7887 clear_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
7888 clear_bit(MD_RECOVERY_DONE
, &mddev
->recovery
);
7890 if (!test_and_clear_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
) ||
7891 test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
7893 /* no recovery is running.
7894 * remove any failed drives, then
7895 * add spares if possible.
7896 * Spares are also removed and re-added, to allow
7897 * the personality to fail the re-add.
7900 if (mddev
->reshape_position
!= MaxSector
) {
7901 if (mddev
->pers
->check_reshape
== NULL
||
7902 mddev
->pers
->check_reshape(mddev
) != 0)
7903 /* Cannot proceed */
7905 set_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7906 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7907 } else if ((spares
= remove_and_add_spares(mddev
, NULL
))) {
7908 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7909 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7910 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7911 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7912 } else if (mddev
->recovery_cp
< MaxSector
) {
7913 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7914 clear_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
7915 } else if (!test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
))
7916 /* nothing to be done ... */
7919 if (mddev
->pers
->sync_request
) {
7921 /* We are adding a device or devices to an array
7922 * which has the bitmap stored on all devices.
7923 * So make sure all bitmap pages get written
7925 bitmap_write_all(mddev
->bitmap
);
7927 mddev
->sync_thread
= md_register_thread(md_do_sync
,
7930 if (!mddev
->sync_thread
) {
7931 printk(KERN_ERR
"%s: could not start resync"
7934 /* leave the spares where they are, it shouldn't hurt */
7935 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7936 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7937 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7938 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7939 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7941 md_wakeup_thread(mddev
->sync_thread
);
7942 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7943 md_new_event(mddev
);
7946 wake_up(&mddev
->sb_wait
);
7948 if (!mddev
->sync_thread
) {
7949 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7950 if (test_and_clear_bit(MD_RECOVERY_RECOVER
,
7952 if (mddev
->sysfs_action
)
7953 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7955 mddev_unlock(mddev
);
7959 void md_reap_sync_thread(struct mddev
*mddev
)
7961 struct md_rdev
*rdev
;
7963 /* resync has finished, collect result */
7964 md_unregister_thread(&mddev
->sync_thread
);
7965 wake_up(&resync_wait
);
7966 if (!test_bit(MD_RECOVERY_INTR
, &mddev
->recovery
) &&
7967 !test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
7969 /* activate any spares */
7970 if (mddev
->pers
->spare_active(mddev
)) {
7971 sysfs_notify(&mddev
->kobj
, NULL
,
7973 set_bit(MD_CHANGE_DEVS
, &mddev
->flags
);
7976 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) &&
7977 mddev
->pers
->finish_reshape
)
7978 mddev
->pers
->finish_reshape(mddev
);
7980 /* If array is no-longer degraded, then any saved_raid_disk
7981 * information must be scrapped.
7983 if (!mddev
->degraded
)
7984 rdev_for_each(rdev
, mddev
)
7985 rdev
->saved_raid_disk
= -1;
7987 md_update_sb(mddev
, 1);
7988 clear_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
);
7989 clear_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
7990 clear_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
);
7991 clear_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
7992 clear_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
7993 /* flag recovery needed just to double check */
7994 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
7995 sysfs_notify_dirent_safe(mddev
->sysfs_action
);
7996 md_new_event(mddev
);
7997 if (mddev
->event_work
.func
)
7998 queue_work(md_misc_wq
, &mddev
->event_work
);
8001 void md_wait_for_blocked_rdev(struct md_rdev
*rdev
, struct mddev
*mddev
)
8003 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8004 wait_event_timeout(rdev
->blocked_wait
,
8005 !test_bit(Blocked
, &rdev
->flags
) &&
8006 !test_bit(BlockedBadBlocks
, &rdev
->flags
),
8007 msecs_to_jiffies(5000));
8008 rdev_dec_pending(rdev
, mddev
);
8010 EXPORT_SYMBOL(md_wait_for_blocked_rdev
);
8012 void md_finish_reshape(struct mddev
*mddev
)
8014 /* called be personality module when reshape completes. */
8015 struct md_rdev
*rdev
;
8017 rdev_for_each(rdev
, mddev
) {
8018 if (rdev
->data_offset
> rdev
->new_data_offset
)
8019 rdev
->sectors
+= rdev
->data_offset
- rdev
->new_data_offset
;
8021 rdev
->sectors
-= rdev
->new_data_offset
- rdev
->data_offset
;
8022 rdev
->data_offset
= rdev
->new_data_offset
;
8025 EXPORT_SYMBOL(md_finish_reshape
);
8027 /* Bad block management.
8028 * We can record which blocks on each device are 'bad' and so just
8029 * fail those blocks, or that stripe, rather than the whole device.
8030 * Entries in the bad-block table are 64bits wide. This comprises:
8031 * Length of bad-range, in sectors: 0-511 for lengths 1-512
8032 * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes)
8033 * A 'shift' can be set so that larger blocks are tracked and
8034 * consequently larger devices can be covered.
8035 * 'Acknowledged' flag - 1 bit. - the most significant bit.
8037 * Locking of the bad-block table uses a seqlock so md_is_badblock
8038 * might need to retry if it is very unlucky.
8039 * We will sometimes want to check for bad blocks in a bi_end_io function,
8040 * so we use the write_seqlock_irq variant.
8042 * When looking for a bad block we specify a range and want to
8043 * know if any block in the range is bad. So we binary-search
8044 * to the last range that starts at-or-before the given endpoint,
8045 * (or "before the sector after the target range")
8046 * then see if it ends after the given start.
8048 * 0 if there are no known bad blocks in the range
8049 * 1 if there are known bad block which are all acknowledged
8050 * -1 if there are bad blocks which have not yet been acknowledged in metadata.
8051 * plus the start/length of the first bad section we overlap.
8053 int md_is_badblock(struct badblocks
*bb
, sector_t s
, int sectors
,
8054 sector_t
*first_bad
, int *bad_sectors
)
8060 sector_t target
= s
+ sectors
;
8063 if (bb
->shift
> 0) {
8064 /* round the start down, and the end up */
8066 target
+= (1<<bb
->shift
) - 1;
8067 target
>>= bb
->shift
;
8068 sectors
= target
- s
;
8070 /* 'target' is now the first block after the bad range */
8073 seq
= read_seqbegin(&bb
->lock
);
8078 /* Binary search between lo and hi for 'target'
8079 * i.e. for the last range that starts before 'target'
8081 /* INVARIANT: ranges before 'lo' and at-or-after 'hi'
8082 * are known not to be the last range before target.
8083 * VARIANT: hi-lo is the number of possible
8084 * ranges, and decreases until it reaches 1
8086 while (hi
- lo
> 1) {
8087 int mid
= (lo
+ hi
) / 2;
8088 sector_t a
= BB_OFFSET(p
[mid
]);
8090 /* This could still be the one, earlier ranges
8094 /* This and later ranges are definitely out. */
8097 /* 'lo' might be the last that started before target, but 'hi' isn't */
8099 /* need to check all range that end after 's' to see if
8100 * any are unacknowledged.
8103 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8104 if (BB_OFFSET(p
[lo
]) < target
) {
8105 /* starts before the end, and finishes after
8106 * the start, so they must overlap
8108 if (rv
!= -1 && BB_ACK(p
[lo
]))
8112 *first_bad
= BB_OFFSET(p
[lo
]);
8113 *bad_sectors
= BB_LEN(p
[lo
]);
8119 if (read_seqretry(&bb
->lock
, seq
))
8124 EXPORT_SYMBOL_GPL(md_is_badblock
);
8127 * Add a range of bad blocks to the table.
8128 * This might extend the table, or might contract it
8129 * if two adjacent ranges can be merged.
8130 * We binary-search to find the 'insertion' point, then
8131 * decide how best to handle it.
8133 static int md_set_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
,
8139 unsigned long flags
;
8142 /* badblocks are disabled */
8146 /* round the start down, and the end up */
8147 sector_t next
= s
+ sectors
;
8149 next
+= (1<<bb
->shift
) - 1;
8154 write_seqlock_irqsave(&bb
->lock
, flags
);
8159 /* Find the last range that starts at-or-before 's' */
8160 while (hi
- lo
> 1) {
8161 int mid
= (lo
+ hi
) / 2;
8162 sector_t a
= BB_OFFSET(p
[mid
]);
8168 if (hi
> lo
&& BB_OFFSET(p
[lo
]) > s
)
8172 /* we found a range that might merge with the start
8175 sector_t a
= BB_OFFSET(p
[lo
]);
8176 sector_t e
= a
+ BB_LEN(p
[lo
]);
8177 int ack
= BB_ACK(p
[lo
]);
8179 /* Yes, we can merge with a previous range */
8180 if (s
== a
&& s
+ sectors
>= e
)
8181 /* new range covers old */
8184 ack
= ack
&& acknowledged
;
8186 if (e
< s
+ sectors
)
8188 if (e
- a
<= BB_MAX_LEN
) {
8189 p
[lo
] = BB_MAKE(a
, e
-a
, ack
);
8192 /* does not all fit in one range,
8193 * make p[lo] maximal
8195 if (BB_LEN(p
[lo
]) != BB_MAX_LEN
)
8196 p
[lo
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8202 if (sectors
&& hi
< bb
->count
) {
8203 /* 'hi' points to the first range that starts after 's'.
8204 * Maybe we can merge with the start of that range */
8205 sector_t a
= BB_OFFSET(p
[hi
]);
8206 sector_t e
= a
+ BB_LEN(p
[hi
]);
8207 int ack
= BB_ACK(p
[hi
]);
8208 if (a
<= s
+ sectors
) {
8209 /* merging is possible */
8210 if (e
<= s
+ sectors
) {
8215 ack
= ack
&& acknowledged
;
8218 if (e
- a
<= BB_MAX_LEN
) {
8219 p
[hi
] = BB_MAKE(a
, e
-a
, ack
);
8222 p
[hi
] = BB_MAKE(a
, BB_MAX_LEN
, ack
);
8230 if (sectors
== 0 && hi
< bb
->count
) {
8231 /* we might be able to combine lo and hi */
8232 /* Note: 's' is at the end of 'lo' */
8233 sector_t a
= BB_OFFSET(p
[hi
]);
8234 int lolen
= BB_LEN(p
[lo
]);
8235 int hilen
= BB_LEN(p
[hi
]);
8236 int newlen
= lolen
+ hilen
- (s
- a
);
8237 if (s
>= a
&& newlen
< BB_MAX_LEN
) {
8238 /* yes, we can combine them */
8239 int ack
= BB_ACK(p
[lo
]) && BB_ACK(p
[hi
]);
8240 p
[lo
] = BB_MAKE(BB_OFFSET(p
[lo
]), newlen
, ack
);
8241 memmove(p
+ hi
, p
+ hi
+ 1,
8242 (bb
->count
- hi
- 1) * 8);
8247 /* didn't merge (it all).
8248 * Need to add a range just before 'hi' */
8249 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8250 /* No room for more */
8254 int this_sectors
= sectors
;
8255 memmove(p
+ hi
+ 1, p
+ hi
,
8256 (bb
->count
- hi
) * 8);
8259 if (this_sectors
> BB_MAX_LEN
)
8260 this_sectors
= BB_MAX_LEN
;
8261 p
[hi
] = BB_MAKE(s
, this_sectors
, acknowledged
);
8262 sectors
-= this_sectors
;
8269 bb
->unacked_exist
= 1;
8270 write_sequnlock_irqrestore(&bb
->lock
, flags
);
8275 int rdev_set_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8280 s
+= rdev
->new_data_offset
;
8282 s
+= rdev
->data_offset
;
8283 rv
= md_set_badblocks(&rdev
->badblocks
,
8286 /* Make sure they get written out promptly */
8287 sysfs_notify_dirent_safe(rdev
->sysfs_state
);
8288 set_bit(MD_CHANGE_CLEAN
, &rdev
->mddev
->flags
);
8289 md_wakeup_thread(rdev
->mddev
->thread
);
8293 EXPORT_SYMBOL_GPL(rdev_set_badblocks
);
8296 * Remove a range of bad blocks from the table.
8297 * This may involve extending the table if we spilt a region,
8298 * but it must not fail. So if the table becomes full, we just
8299 * drop the remove request.
8301 static int md_clear_badblocks(struct badblocks
*bb
, sector_t s
, int sectors
)
8305 sector_t target
= s
+ sectors
;
8308 if (bb
->shift
> 0) {
8309 /* When clearing we round the start up and the end down.
8310 * This should not matter as the shift should align with
8311 * the block size and no rounding should ever be needed.
8312 * However it is better the think a block is bad when it
8313 * isn't than to think a block is not bad when it is.
8315 s
+= (1<<bb
->shift
) - 1;
8317 target
>>= bb
->shift
;
8318 sectors
= target
- s
;
8321 write_seqlock_irq(&bb
->lock
);
8326 /* Find the last range that starts before 'target' */
8327 while (hi
- lo
> 1) {
8328 int mid
= (lo
+ hi
) / 2;
8329 sector_t a
= BB_OFFSET(p
[mid
]);
8336 /* p[lo] is the last range that could overlap the
8337 * current range. Earlier ranges could also overlap,
8338 * but only this one can overlap the end of the range.
8340 if (BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > target
) {
8341 /* Partial overlap, leave the tail of this range */
8342 int ack
= BB_ACK(p
[lo
]);
8343 sector_t a
= BB_OFFSET(p
[lo
]);
8344 sector_t end
= a
+ BB_LEN(p
[lo
]);
8347 /* we need to split this range */
8348 if (bb
->count
>= MD_MAX_BADBLOCKS
) {
8352 memmove(p
+lo
+1, p
+lo
, (bb
->count
- lo
) * 8);
8354 p
[lo
] = BB_MAKE(a
, s
-a
, ack
);
8357 p
[lo
] = BB_MAKE(target
, end
- target
, ack
);
8358 /* there is no longer an overlap */
8363 BB_OFFSET(p
[lo
]) + BB_LEN(p
[lo
]) > s
) {
8364 /* This range does overlap */
8365 if (BB_OFFSET(p
[lo
]) < s
) {
8366 /* Keep the early parts of this range. */
8367 int ack
= BB_ACK(p
[lo
]);
8368 sector_t start
= BB_OFFSET(p
[lo
]);
8369 p
[lo
] = BB_MAKE(start
, s
- start
, ack
);
8370 /* now low doesn't overlap, so.. */
8375 /* 'lo' is strictly before, 'hi' is strictly after,
8376 * anything between needs to be discarded
8379 memmove(p
+lo
+1, p
+hi
, (bb
->count
- hi
) * 8);
8380 bb
->count
-= (hi
- lo
- 1);
8386 write_sequnlock_irq(&bb
->lock
);
8390 int rdev_clear_badblocks(struct md_rdev
*rdev
, sector_t s
, int sectors
,
8394 s
+= rdev
->new_data_offset
;
8396 s
+= rdev
->data_offset
;
8397 return md_clear_badblocks(&rdev
->badblocks
,
8400 EXPORT_SYMBOL_GPL(rdev_clear_badblocks
);
8403 * Acknowledge all bad blocks in a list.
8404 * This only succeeds if ->changed is clear. It is used by
8405 * in-kernel metadata updates
8407 void md_ack_all_badblocks(struct badblocks
*bb
)
8409 if (bb
->page
== NULL
|| bb
->changed
)
8410 /* no point even trying */
8412 write_seqlock_irq(&bb
->lock
);
8414 if (bb
->changed
== 0 && bb
->unacked_exist
) {
8417 for (i
= 0; i
< bb
->count
; i
++) {
8418 if (!BB_ACK(p
[i
])) {
8419 sector_t start
= BB_OFFSET(p
[i
]);
8420 int len
= BB_LEN(p
[i
]);
8421 p
[i
] = BB_MAKE(start
, len
, 1);
8424 bb
->unacked_exist
= 0;
8426 write_sequnlock_irq(&bb
->lock
);
8428 EXPORT_SYMBOL_GPL(md_ack_all_badblocks
);
8430 /* sysfs access to bad-blocks list.
8431 * We present two files.
8432 * 'bad-blocks' lists sector numbers and lengths of ranges that
8433 * are recorded as bad. The list is truncated to fit within
8434 * the one-page limit of sysfs.
8435 * Writing "sector length" to this file adds an acknowledged
8437 * 'unacknowledged-bad-blocks' lists bad blocks that have not yet
8438 * been acknowledged. Writing to this file adds bad blocks
8439 * without acknowledging them. This is largely for testing.
8443 badblocks_show(struct badblocks
*bb
, char *page
, int unack
)
8454 seq
= read_seqbegin(&bb
->lock
);
8459 while (len
< PAGE_SIZE
&& i
< bb
->count
) {
8460 sector_t s
= BB_OFFSET(p
[i
]);
8461 unsigned int length
= BB_LEN(p
[i
]);
8462 int ack
= BB_ACK(p
[i
]);
8468 len
+= snprintf(page
+len
, PAGE_SIZE
-len
, "%llu %u\n",
8469 (unsigned long long)s
<< bb
->shift
,
8470 length
<< bb
->shift
);
8472 if (unack
&& len
== 0)
8473 bb
->unacked_exist
= 0;
8475 if (read_seqretry(&bb
->lock
, seq
))
8484 badblocks_store(struct badblocks
*bb
, const char *page
, size_t len
, int unack
)
8486 unsigned long long sector
;
8490 /* Allow clearing via sysfs *only* for testing/debugging.
8491 * Normally only a successful write may clear a badblock
8494 if (page
[0] == '-') {
8498 #endif /* DO_DEBUG */
8500 switch (sscanf(page
, "%llu %d%c", §or
, &length
, &newline
)) {
8502 if (newline
!= '\n')
8514 md_clear_badblocks(bb
, sector
, length
);
8517 #endif /* DO_DEBUG */
8518 if (md_set_badblocks(bb
, sector
, length
, !unack
))
8524 static int md_notify_reboot(struct notifier_block
*this,
8525 unsigned long code
, void *x
)
8527 struct list_head
*tmp
;
8528 struct mddev
*mddev
;
8531 for_each_mddev(mddev
, tmp
) {
8532 if (mddev_trylock(mddev
)) {
8534 __md_stop_writes(mddev
);
8535 mddev
->safemode
= 2;
8536 mddev_unlock(mddev
);
8541 * certain more exotic SCSI devices are known to be
8542 * volatile wrt too early system reboots. While the
8543 * right place to handle this issue is the given
8544 * driver, we do want to have a safe RAID driver ...
8552 static struct notifier_block md_notifier
= {
8553 .notifier_call
= md_notify_reboot
,
8555 .priority
= INT_MAX
, /* before any real devices */
8558 static void md_geninit(void)
8560 pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t
));
8562 proc_create("mdstat", S_IRUGO
, NULL
, &md_seq_fops
);
8565 static int __init
md_init(void)
8569 md_wq
= alloc_workqueue("md", WQ_MEM_RECLAIM
, 0);
8573 md_misc_wq
= alloc_workqueue("md_misc", 0, 0);
8577 if ((ret
= register_blkdev(MD_MAJOR
, "md")) < 0)
8580 if ((ret
= register_blkdev(0, "mdp")) < 0)
8584 blk_register_region(MKDEV(MD_MAJOR
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8585 md_probe
, NULL
, NULL
);
8586 blk_register_region(MKDEV(mdp_major
, 0), 1UL<<MINORBITS
, THIS_MODULE
,
8587 md_probe
, NULL
, NULL
);
8589 register_reboot_notifier(&md_notifier
);
8590 raid_table_header
= register_sysctl_table(raid_root_table
);
8596 unregister_blkdev(MD_MAJOR
, "md");
8598 destroy_workqueue(md_misc_wq
);
8600 destroy_workqueue(md_wq
);
8608 * Searches all registered partitions for autorun RAID arrays
8612 static LIST_HEAD(all_detected_devices
);
8613 struct detected_devices_node
{
8614 struct list_head list
;
8618 void md_autodetect_dev(dev_t dev
)
8620 struct detected_devices_node
*node_detected_dev
;
8622 node_detected_dev
= kzalloc(sizeof(*node_detected_dev
), GFP_KERNEL
);
8623 if (node_detected_dev
) {
8624 node_detected_dev
->dev
= dev
;
8625 list_add_tail(&node_detected_dev
->list
, &all_detected_devices
);
8627 printk(KERN_CRIT
"md: md_autodetect_dev: kzalloc failed"
8628 ", skipping dev(%d,%d)\n", MAJOR(dev
), MINOR(dev
));
8633 static void autostart_arrays(int part
)
8635 struct md_rdev
*rdev
;
8636 struct detected_devices_node
*node_detected_dev
;
8638 int i_scanned
, i_passed
;
8643 printk(KERN_INFO
"md: Autodetecting RAID arrays.\n");
8645 while (!list_empty(&all_detected_devices
) && i_scanned
< INT_MAX
) {
8647 node_detected_dev
= list_entry(all_detected_devices
.next
,
8648 struct detected_devices_node
, list
);
8649 list_del(&node_detected_dev
->list
);
8650 dev
= node_detected_dev
->dev
;
8651 kfree(node_detected_dev
);
8652 rdev
= md_import_device(dev
,0, 90);
8656 if (test_bit(Faulty
, &rdev
->flags
)) {
8660 set_bit(AutoDetected
, &rdev
->flags
);
8661 list_add(&rdev
->same_set
, &pending_raid_disks
);
8665 printk(KERN_INFO
"md: Scanned %d and added %d devices.\n",
8666 i_scanned
, i_passed
);
8668 autorun_devices(part
);
8671 #endif /* !MODULE */
8673 static __exit
void md_exit(void)
8675 struct mddev
*mddev
;
8676 struct list_head
*tmp
;
8678 blk_unregister_region(MKDEV(MD_MAJOR
,0), 1U << MINORBITS
);
8679 blk_unregister_region(MKDEV(mdp_major
,0), 1U << MINORBITS
);
8681 unregister_blkdev(MD_MAJOR
,"md");
8682 unregister_blkdev(mdp_major
, "mdp");
8683 unregister_reboot_notifier(&md_notifier
);
8684 unregister_sysctl_table(raid_table_header
);
8685 remove_proc_entry("mdstat", NULL
);
8686 for_each_mddev(mddev
, tmp
) {
8687 export_array(mddev
);
8688 mddev
->hold_active
= 0;
8690 destroy_workqueue(md_misc_wq
);
8691 destroy_workqueue(md_wq
);
8694 subsys_initcall(md_init
);
8695 module_exit(md_exit
)
8697 static int get_ro(char *buffer
, struct kernel_param
*kp
)
8699 return sprintf(buffer
, "%d", start_readonly
);
8701 static int set_ro(const char *val
, struct kernel_param
*kp
)
8704 int num
= simple_strtoul(val
, &e
, 10);
8705 if (*val
&& (*e
== '\0' || *e
== '\n')) {
8706 start_readonly
= num
;
8712 module_param_call(start_ro
, set_ro
, get_ro
, NULL
, S_IRUSR
|S_IWUSR
);
8713 module_param(start_dirty_degraded
, int, S_IRUGO
|S_IWUSR
);
8715 module_param_call(new_array
, add_named_array
, NULL
, NULL
, S_IWUSR
);
8717 EXPORT_SYMBOL(register_md_personality
);
8718 EXPORT_SYMBOL(unregister_md_personality
);
8719 EXPORT_SYMBOL(md_error
);
8720 EXPORT_SYMBOL(md_done_sync
);
8721 EXPORT_SYMBOL(md_write_start
);
8722 EXPORT_SYMBOL(md_write_end
);
8723 EXPORT_SYMBOL(md_register_thread
);
8724 EXPORT_SYMBOL(md_unregister_thread
);
8725 EXPORT_SYMBOL(md_wakeup_thread
);
8726 EXPORT_SYMBOL(md_check_recovery
);
8727 EXPORT_SYMBOL(md_reap_sync_thread
);
8728 MODULE_LICENSE("GPL");
8729 MODULE_DESCRIPTION("MD RAID framework");
8731 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR
);